JP6904299B2 - Laminated battery manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a laminated battery.

A laminated battery (also referred to as an assembled battery) is manufactured by electrically connecting a plurality of cells in series and / or in parallel. According to the laminated battery, it is possible to increase the voltage and / or capacity of the battery as a whole to a desired level.

In the manufacture of laminated batteries, it is known that the electrodes (current collector tabs) of each cell are welded to the cell-cell connection member (bus bar). For example, in Patent Document 1, a plurality of cell cells having electrodes including a thin metal plate protruding from one side and the other side are laminated, and the electrodes of the adjacent cell cells are joined to form a battery containing the plurality of cell cells. A first method of manufacturing an assembled battery in which a laminated body is formed, wherein a first bent portion and a second bent portion are formed on the electrodes of the adjacent cells, and the tips of the electrodes are brought close to each other. The step and the plurality of side electrode portions are arranged to face each of the plurality of tip portions arranged along the direction in which the cell cells are stacked, and the side electrode portions are added to the tip portions. A second step of pressing to form the joint end portion by joining the metal thin plates constituting the tip portion to each other by a recess portion having a V-shaped cross section having inclined and opposite surfaces formed on the side electrode portion. And having a third step of irradiating an energy beam from the back surface of the side electrode portion on the side opposite to the joint end portion in the recessed portion to weld the joint end portion and the side electrode portion. A method for manufacturing a characteristic assembled battery is described.

Japanese Unexamined Patent Publication No. 2016-091607 Japanese Unexamined Patent Publication No. 2011-249243 Japanese Unexamined Patent Publication No. 2012-109275

According to the method for manufacturing an assembled battery described in Patent Document 1, the side electrode portion not only functions as a jig for joining and adhering thin metal plates, but also electrically connects the cells after the assembled battery is completed. It is claimed that the assembled battery can be manufactured by utilizing the jig used at the time of manufacturing as a part of the product because it can be used as an electrode portion for measuring the voltage of the bus bar and the cell.

However, when the thickness of the cell is thin, the distance between the electrodes (current collector tabs) of the adjacent cell becomes narrow, so the cell-cell connection member (bus bar) is correctly arranged between the cell electrode and the cell. It is not easy to connect with a connecting member. By combining multiple types of cells with electrodes (collection tabs) at different positions, it is possible to increase the distance between the electrodes of adjacent cells even when the cells are thin. However, this time, there is a problem of increasing the manufacturing cost due to the separately manufacturing of a plurality of types of cell batteries.

According to the present invention, even when the thickness of the cell is thin, it is possible to easily connect the cell-to-cell connection member and the cell without preparing a plurality of different types of cell. An object is to provide a manufacturing method.

One embodiment of the present invention is a power generation element manufacturing step of manufacturing a power generation element including one or more laminated structures including a positive electrode current collector, a positive electrode layer, a separator layer, a negative electrode layer, and a negative electrode current collector in this order. After connecting the positive electrode current collector tab to one or more positive electrode current collectors of the power generation element and connecting the negative electrode current collector tab to one or more negative electrode current collectors of the power generation element, the power generation element is attached to the exterior. A step of manufacturing a square cell by encapsulating it in a body, wherein the exterior body has a first surface having a longitudinal direction and a lateral direction, and the positive electrode current collecting tab and the positive electrode current collecting tab and the positive electrode current collecting tab are provided from the first surface. The negative electrode current collecting tab projects to the outside of the exterior body, and the positive electrode current collecting tab and the negative electrode current collecting tab pass through the midpoints of the two sides in the longitudinal direction of the first surface on the first surface. The cell manufacturing step in which the distances from the straight line 1 are arranged at different positions, and the even number of the cell cells of 4 or more are arranged so that the first surfaces of the cell cells are aligned with each other. A stacking process in which the positive electrode current collecting tabs of each cell are stacked so that the negative electrode current collecting tabs are viewed in opposite directions, and at least two adjacent cell cells having the same electrode are placed between cells. It is a method for manufacturing a laminated battery, which comprises a connection step of connecting with a connecting member.

In the present invention, since the cells are stacked so that the directions of the cells are alternately reversed in the stacking process, the space between the current collecting tabs of the same pole to be connected in the connecting process is as wide as two cells. The interval can be secured. Therefore, according to the present invention, even when the thickness of the cell is thin, it is possible to easily connect the cell-to-cell connection member and the cell without preparing a plurality of different types of cell. A method for manufacturing a laminated battery can be provided.

It is a flowchart explaining the manufacturing method S10 of the laminated battery which concerns on one Embodiment of this invention. It is a figure schematically explaining an example (power generation element 10) of the power generation element manufactured in the power generation element manufacturing process S1. (A) It is a top view of the power generation element 10. (B) It is a bottom view of the power generation element 10. (C) It is a CC arrow view of (A). It is sectional drawing which schematically explains another example (power generation element 10') of the power generation element manufactured in the power generation element manufacturing process S1. It is a top view schematically explaining the cell 100 manufactured in the cell manufacturing step S2. It is a figure explaining typically the cell 100. (A) is a side view taken along the line AA of FIG. (B) is a cross-sectional view taken along the line BB of (A). (C) is a cross-sectional view taken along the line CC of (A). It is a top view which shows typically the posture which four cell batteries 100 were laminated in the stacking process S3. It is a top view schematically explaining the laminated battery 1000 after the connection step S4. (A) It is a top view schematically explaining the laminated battery 1000. (B) It is a top view schematically explaining the cell-cell connecting member 201. (C) It is a top view schematically explaining the cell-to-cell connecting member 202. It is an equivalent circuit diagram of a laminated battery 1000. It is a top view schematically explaining the laminated battery 2000 manufactured by the manufacturing method of the laminated battery which concerns on another embodiment. It is a top view schematically explaining the laminated battery 3000 manufactured by the manufacturing method of the laminated battery which concerns on another embodiment. It is a top view schematically explaining the cell-to-cell connecting member 3203. It is a top view schematically explaining the laminated battery 4000 manufactured by the manufacturing method of the laminated battery which concerns on another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to these forms. The drawings do not necessarily reflect the exact dimensions. Further, in the figure, some reference numerals may be omitted. In the present specification, unless otherwise specified, the notation "A to B" for the numerical values A and B means "A or more and B or less". When a unit is attached only to the numerical value B in such a notation, the unit shall be applied to the numerical value A as well. The words "or" and "or" shall mean OR unless otherwise specified.

<Manufacturing method of laminated battery S10>
FIG. 1 is a flowchart illustrating a laminated battery manufacturing method S10 (hereinafter, may be simply referred to as “manufacturing method S10”) according to an embodiment of the present invention. As shown in FIG. 1, the manufacturing method S10 includes a power generation element manufacturing step S1, a cell manufacturing step S2, a stacking step S3, and a connecting step S4 in this order. Hereinafter, each step will be described in order.

(Power generation element manufacturing process S1)
The power generation element manufacturing step S1 (hereinafter, may be simply referred to as “step S1”) has one laminated structure including a negative electrode current collector, a negative electrode layer, a separator layer, a positive electrode layer, and a positive electrode current collector in this order. This is a process of manufacturing a power generation element including the above. Hereinafter, an embodiment of manufacturing a power generation element which is a lithium ion secondary battery will be mainly described, but the step S1 is not limited to the embodiment, and instead of the lithium ion secondary battery, for example, a lithium primary battery is used. It is also possible to perform step S1 in the form of manufacturing other power generation elements such as a battery, a sodium ion secondary battery, a magnesium ion secondary battery, and an aluminum ion secondary battery.

FIG. 2 is a diagram schematically showing an example of a power generation element (power generation element 10) manufactured in step S1. 2 (A) is a plan view of the power generation element 10, FIG. 2 (B) is a bottom view of the power generation element 10, and FIG. 2 (C) is a side view taken along the line CC of FIG. 2 (A). Is. The power generation element 10 has a laminated structure including a positive electrode current collector 11, a positive electrode layer 12, a separator layer 13, a negative electrode layer 14, and a negative electrode current collector 15 in this order. The positive electrode layer 12 is provided on the surface of the positive electrode current collector 11, the negative electrode layer 14 is provided on the surface of the negative electrode current collector 15, and the separator layer 13 is arranged between the positive electrode layer 12 and the negative electrode layer 14.

The positive electrode layer 12 and the negative electrode layer 14 contain at least an active material, and optionally contain a solid electrolyte, a binder, and a conductive auxiliary agent. As the active material, any active material capable of storing and releasing ions can be used. Among the active materials, two materials having different potentials (charge / discharge potentials) for storing and releasing ions are selected, the material showing a noble potential is used as the positive electrode active material, and the material showing a low potential is used as the negative electrode active material described later. , Each of which can be used. When the power generation element 10 is a lithium ion secondary battery, for example, lithium cobaltate, lithium nickelate, Li _{1 + α} Ni _1/3 Mn _1/3 Co- ₁ / 3 O ₂ , lithium manganate as positive electrode active materials. , Spinel-type lithium composite oxide, lithium-containing composite oxide such as lithium titanate can be used, and carbon materials such as graphite and hard carbon, Si and Si alloys, Li ₄ Ti ₅ O _12, etc. can be used as the negative electrode active material. Can be used. The positive electrode active material may have a coating layer such as lithium niobate on its surface. The solid electrolyte is preferably an inorganic solid electrolyte. This is because the ionic conductivity is higher than that of the organic polymer electrolyte. This is also because it has excellent heat resistance as compared with the organic polymer electrolyte. Preferred solid electrolytes include oxide solid electrolytes such as _{Li 3} PO _{4 , Li 2} S-P ₂ S ₅ , Li ₂ S-SiS ₂ , LiI-Li ₂ S-SiS ₂ , and LiI-Si ₂ S-P _2. Sulfide solid electrolytes such as S ₅ , LiI-Li _{2 SP 2} O ₅ , LiI-Li ₃ PO _4- P ₂ S _{5 and the like can be exemplified.} Among these, a sulfide solid electrolyte containing _{Li 2} SP ₂ S _{5 is particularly preferable.} As the binder, any known binder can be applied. For example, butadiene rubber (BR), styrene butadiene rubber (SBR), acrylate butadiene rubber (ABR), polyvinylidene fluoride (PVdF) and the like. As the conductive auxiliary agent, a carbon material such as acetylene black or Ketjen black or a metal material such as nickel, aluminum or stainless steel can be used. The content of each component in the positive electrode layer 12 and the negative electrode layer 14 and the shape and thickness of the positive electrode layer 12 and the negative electrode layer 14 can be the same as those in the prior art. The positive electrode layer 12 and the negative electrode layer 14 are formed by kneading an active material with a solid electrolyte, a binder and a conductive additive to be optionally contained in a solvent to obtain a slurry-like electrode composition, and then the electrodes. The composition can be produced by applying the composition to the surface of the current collector and drying the composition.

The positive electrode current collector 11 and the negative electrode current collector 15 can be made of a metal foil, a metal mesh, or the like, and a metal foil is particularly preferable. By using a metal foil as the current collector, it becomes easy to connect the positive electrode current collector 11 and the negative electrode current collector 15 to the positive electrode current collector tab and the negative electrode current collector tab, respectively, in the cell manufacturing step S2 described later. .. Examples of the metal that can form the positive electrode current collector 11 include stainless steel, Ni, Cr, Au, Pt, Al, Fe, Ti, Zn, and the like. Examples of the metal that can form the negative electrode current collector 15 include stainless steel, Cu, Ni, Fe, Ti, Co, and Zn.

The separator layer 13 is a member that electrically insulates the positive electrode layer 12 and the negative electrode layer 14 and enables ions to move between the positive electrode layer 12 and the negative electrode layer 14. The separator layer 13 may be a porous layer that absorbs and retains the electrolytic solution, may be a polymer film that absorbs and retains the electrolytic solution, or may be a solid electrolyte layer.

When an electrolytic solution is used for the separator layer 13, a known organic electrolytic solution used for a lithium ion secondary battery can be appropriately used as the electrolytic solution. Such an organic electrolyte contains a lithium salt and an organic solvent. Examples of the lithium salt contained in the organic electrolyte include inorganic lithium salts such _{as LiPF 6 , LiBF 4} , LiClO ₄ , and LiAsF _{6 , LiCF 3} SO ₃ , LiN (CF ₃ SO _{2 ) 2} , and LiN (C). Examples thereof include organic lithium salts such as ₂ F ₅ SO ₂ ) ₂ and LiC (CF ₃ SO ₂ ) _3. Examples of the organic solvent of the organic electrolytic solution include ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), butylene carbonate, and γ-butyrolactone. Examples thereof include sulfolane, acetonitrile, 1,2-dimethoxymethane, 1,3-dimethoxypropane, diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, and mixtures thereof. The concentration of the lithium salt in the organic electrolytic solution can be, for example, in the range of 0.1 mol / L to 3 mol / L. As the organic electrolytic solution, a low volatile liquid such as an ionic liquid may be used. As the porous layer or polymer film that absorbs and retains the electrolytic solution, the porous layer or polymer film conventionally used for the separator layer can be used without particular limitation.

When the separator layer 13 is a solid electrolyte layer, the separator layer 13 contains the positive electrode active material contained in the positive electrode layer 12 and the solid electrolyte having the conductivity of ions occluded and released by the negative electrode active material contained in the negative electrode layer 14. It consists of. As such a solid electrolyte, the solid electrolyte described above in relation to the positive electrode layer 12 and the negative electrode layer 14 can be used without particular limitation. However, the separator layer 13 which is a solid electrolyte layer preferably contains a sulfide solid electrolyte. Examples of preferred solid electrolytes, _Li 3 PO ₄ oxides such solid electrolyte and _{Li 2 S-P 2 S 5} , Li 2 S-SiS 2, LiI-Li 2 S-SiS 2, LiI-Si 2 S- Examples thereof include sulfide solid electrolytes such as P ₂ S ₅ , LiI-Li ₂ S-P ₂ O ₅ , LiI-Li ₃ PO _4- P ₂ S _5. Among these, a sulfide solid electrolyte containing _{Li 2} SP ₂ S _{5 is particularly preferable.} The separator layer 13 which is a solid electrolyte layer may contain two or more kinds of solid electrolytes. Further, the separator layer 13 which is a solid electrolyte layer optionally contains a binder. As the binder, the same binder as that used for the positive electrode 12 and the negative electrode 14 can be used. The content of each component in the separator layer 13 which is a solid electrolyte layer and the shape and thickness of the separator layer 13 can be the same as those in the prior art. The separator layer 13, which is a solid electrolyte layer, is obtained by adding a solid electrolyte and optionally a binder to a solvent and kneading the mixture to obtain a slurry-like electrolyte composition, and then applying the electrolyte composition to the surface of the base material. It can be produced by going through a process such as drying.

By laminating and integrating each of the above layers, a laminated structure (elementary battery) 1 having a positive electrode current collector 11, a positive electrode layer 12, a separator layer 13, a negative electrode layer 14, and a negative electrode current collector 15 in this order. The power generation element 10 including the above is configured. The power generation element 10 of FIG. 2 includes only one laminated structure (elementary battery) 1, but the number of elementary batteries 1 included in the power generation element produced in step S1 is not particularly limited, and is one or more. It can be any number. In particular, in step S1, it is preferable that a power generation element including a plurality of laminated structures (elementary batteries) 1 is manufactured. FIG. 3 is a cross-sectional view schematically illustrating the power generation element 10'according to such another example. The power generation element 10'is formed by integrally stacking a plurality of elementary batteries 1, 1, ... By sharing a current collector (positive electrode current collector 11 or negative electrode current collector 15). In the power generation element 10', the positive electrode current collector 11 shared by the sets of the elementary batteries 1 and 1 that are integrally adjacent to each other is provided with positive electrode layers 12 on both sides thereof. Further, the negative electrode current collector 15 shared by the sets of the elementary batteries 1 and 1 that are integrally adjacent to each other is provided with negative electrode layers 14 on both sides thereof. Then, as will be described later, in the cell manufacturing step S2, the positive electrode current collectors 11, 11, ... Are electrically connected to the positive electrode current collector tabs, respectively, and the negative electrode current collectors 15, 15, ... Are connected to the negative electrode current collector tabs, respectively. By being electrically connected, each elementary battery 1 is electrically connected in parallel.

(Single battery manufacturing step S2)
In the cell manufacturing step S2 (hereinafter, may be simply referred to as “step S2”), the positive electrode current collector tab 31 is connected to the positive electrode current collector 11 of the power generation element 10, and the negative electrode current collector 15 of the power generation element 10 is connected. This is a step of manufacturing a square cell 100 by enclosing the power generation element 10 in the exterior body 20 after connecting the negative electrode current collecting tab 32. FIG. 4 is a plan view schematically illustrating the cell 100 produced in step S2. FIG. 5A is a view taken along the line AA of FIG. 4 (right side view). 5 (B) is a cross-sectional view taken along the line BB of FIG. 5 (A). 5 (C) is a cross-sectional view taken along the line CC of FIG. 5 (A). Hereinafter, step S2 will be described with reference to FIGS. 4 and 5.

As shown in FIG. 5, the cell 100 has a power generation element 10, an exterior body (battery case) 20, a positive electrode current collecting tab 31, and a negative electrode current collecting tab 32. The positive electrode current collector 11 of the power generation element 10 is electrically connected to the positive electrode current collector tab 31, and the negative electrode current collector 15 of the power generation element 10 is electrically connected to the negative electrode current collector tab 32. Various metal materials can be used for the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 without particular limitation as in the conventional case. Further, as a method of electrically connecting the positive electrode current collector 11 to the positive electrode current collector tab 31 and a method of electrically connecting the negative electrode current collector 15 to the negative electrode current collector tab 32, spot welding, laser welding, and resistance are used. Known connection methods such as welding, electromagnetic pressure welding, seam welding, and brazing can be used without particular limitation.

As shown in FIGS. 4 and 5, the exterior body 20 has a rectangular parallelepiped shape. The material of the exterior body 20 is not particularly limited as long as it is a square exterior body capable of accommodating at least a part of the power generation element 10, the positive electrode current collecting tab 31, and the negative electrode current collecting tab 32. For example, a metal housing or the like can be used as the exterior body 20. A method of enclosing the power generation element 10 in which the positive electrode current collector 11 is electrically connected to the positive electrode current collector tab 31 and the negative electrode current collector 15 is electrically connected to the negative electrode current collector tab 32 is enclosed in the exterior body 20. The conventional encapsulation method can be used without particular limitation.

As shown in FIGS. 4 and 5A, in the cell 100, the exterior body 20 includes a first surface 20a, and the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 are exteriors from the first surface 20a. It protrudes to the outside of the body 20. The first surface 20a has a longitudinal direction (arrow X in FIG. 4) and a lateral direction (arrow Y in FIG. 4). Further, as shown in FIG. 4, the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 are arranged apart from each other in the longitudinal direction X of the first surface 20a, and the first surface 20a has a first surface. Distances D1 and D2 from the first straight line L1 are arranged at different positions with respect to the first straight line L1 passing through the midpoints M1 and M2 of the two sides in the longitudinal direction of the surface 20a. The first straight line L1 can be rephrased as a straight line that is orthogonal to the longitudinal direction X and bisects the first surface 20a in the longitudinal direction X. As shown in FIG. 4, on the first surface 20a, one of the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 (the positive electrode current collecting tab 31 in the cell 100) has a first straight line L1. It is arranged between a straight line L2 which is a parallel straight line and has the same distance from one end E1 and the first straight line L1 in the longitudinal direction X of the first surface 20a and the one end E1. It is preferable that the other side of the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 (the negative electrode current collecting tab 32 in the cell 100) is a straight line parallel to the first straight line L1 and is formed on the first surface 20a. It is preferably arranged between the straight line L3 having the same distance from the other end E2 and the first straight line L1 in the longitudinal direction X and the first straight line L1. By arranging the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 on the first surface 20a in this way, the positive electrode current collecting tab 31 to the negative electrode current collecting tab 32 of each cell 100 in the lamination step S3 described later will be performed. When a plurality of cell cells 100 are stacked so that the viewing directions are alternately reversed, the positive electrode current collecting tab 31 and the negative electrode of one cell cell 100 in any of the two adjacent cell cell 100 and 100 sets are used. Since the range occupied by the current collecting tab 32 in the longitudinal direction X and the range occupied by the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 of the other cell 100 in the longitudinal direction X do not overlap, in the connection step S4 described later. The connection work between each current collecting tab and the cell-cell connecting member becomes easier.

(Laminating step S3)
In the laminating step S3 (hereinafter, may be simply referred to as “step S3”), four or more even-numbered cells 100, 100, ... Are arranged so that the first surface 20a of each cell 100 is aligned (the first surface 20a of each cell 100 is aligned). That is, it is a step of laminating so that the first surfaces 20a face the same direction) and the directions of viewing the negative electrode current collecting tabs 32 from the positive electrode current collecting tabs 31 of each cell 100 are alternately reversed. .. FIG. 6 is a plan view schematically showing the posture in which the four cell batteries 100 are stacked in the stacking step S3. In FIG. 6, the positive electrode current collector 31 is designated by a “+” and the negative electrode current collector 32 is designated by a “−”. As shown in FIG. 6, in step S3, the stacking is performed so that the directions of viewing the negative electrode current collecting tab 32 from the positive electrode current collecting tab 31 of each cell 100 (arrow Z in FIG. 6) are alternately reversed. It is said.

(Connection step S4)
The connection step S4 (hereinafter, may be simply referred to as “step S4”) is a step of connecting at least two adjacent current collecting tabs of the same pole of the cell with a cell-to-cell connecting member (bus bar). By going through the connection step S4, the laminated battery 1000 is manufactured. FIG. 7 is a plan view schematically illustrating the laminated battery 1000 after the connection step S4. FIG. 7A is a plane schematically illustrating the arrangement and the posture in which the cell-to-cell connecting members 201, 201, 202 are arranged and connected to the four cell cells 100 (see FIG. 6) laminated in the laminating step S3. It is a figure. FIG. 7B is a plan view schematically illustrating the cell-to-cell connecting member 201. FIG. 7C is a plan view schematically illustrating the cell-to-cell connecting member 202. In FIG. 7A, for convenience of explanation, the four cell batteries 100 stacked in the stacking step S3 are referred to as B1, B2, B3, and B4, respectively, in order from one end.

In the connection step S4, one or more integers m and two or more integers n such that N = 2 mn are selected with respect to the number N of cells stacked in step S3 (N is an even number of 4 or more), and step S3. Assuming that the N cells stacked in the above are composed of m groups and each group is composed of 2n adjacent cells, the first direction is to look at the negative electrode current collection tab from the positive electrode current collection tab for each group. The positive electrode current collecting tabs of the first subgroup consisting of n cell cells are electrically connected to each other by the inter-cell connecting member, and the negative electrode current collecting tab is viewed from the positive electrode current collecting tab. Each negative electrode current collecting tab of the second subgroup consisting of n cell cells in the second direction opposite to the direction of 1 is electrically connected to each other by the cell-to-cell connecting member, and the first subgroup is connected. Each negative electrode current collecting tab of the above and each positive electrode current collecting tab of the second subgroup can be electrically connected to each other by an inter-cell connecting member. Then, when m ≧ 2, all the integers k satisfying 1 ≦ k ≦ m-1 are arranged in the kth group from one end so that m adjacent groups are electrically connected in series. The negative electrode current collecting tabs of the second subgroup and the positive electrode current collecting tabs of the first subgroup of the k + 1th group can be electrically connected to each other by the cell-to-cell connecting member. As a result, in each group, the n cells of the first subgroup are connected in parallel, the n cells of the second subgroup are connected in parallel, and the first subgroup and the second subgroup are connected in parallel. The subgroups are connected in series, and when m ≧ 2, m groups are further connected in series. When m ≧ 2, for each k, the electrical negative electrode current collection tabs of the second subgroup of the kth group and the positive electrode current collection tabs of the first subgroup of the k + 1st group are electrically connected. The connection, the electrical connection between the negative electrode current collection tabs in the second subgroup of the kth group, and the electrical connection between the positive electrode current collection tabs in the first subgroup of the k + 1st group are simple. It is preferable to use one cell-to-cell connecting member. Since an even number of cells are laminated in the stacking step S3, the stack of cells obtained in the stacking step S3 is the first one in which the cells of the first subgroup are arranged in the stacking direction. It has an end and a second end in which a second subgroup of cells is located. In one preferred embodiment, when m ≧ 2, all integers k satisfying 1 ≦ k ≦ m-1 are such that adjacent m groups are electrically connected in series. An inter-cell connecting member between each negative electrode current collecting tab of the second subgroup of the kth group from the end and each positive electrode current collecting tab of the first subgroup of the k + 1th group from the first end. Can be electrically connected to each other.

In step S4, the positive electrode current collecting tab 31 of the cell B1 and the positive electrode current collecting tab 31 of the cell B3 adjacent to the cell B1 are electrically connected by the cell-to-cell connecting member 201. Further, the negative electrode current collecting tab 32 of the cell B2 adjacent to the cell B1 and the negative electrode current collecting tab 32 of the cell B4 adjacent to the cell B2 are electrically connected by the cell-to-cell connecting member 201. Will be done. Then, the negative electrode current collecting tab 32 of the cell B1, the negative electrode current collecting tab 32 of the cell B3 adjacent to the cell B1, and the positive electrode current collecting tab 31 of the cell B2 adjacent to the cell B1. The positive electrode current collecting tab 31 of the cell B4 adjacent to the cell B2 is electrically connected by the cell-cell connecting member 202.

In other words, in step S4, with respect to the number of cells N = 4 stacked in step S3, 1 or more integers m and 2 or more integers n such that N = 2 mn are set to m = 1 and n = 2. Assuming that the N cells selected and stacked in step S3 consist of m (= 1) groups and the group consists of 2n (= 4) adjacent cells, the positive electrode collection for the group. Each positive electrode current collecting tab 31 of the first subgroup (cell B1, B3) composed of n (= 2) cells whose first direction is the direction in which the negative electrode current collecting tab 32 is viewed from the electric tab 31 From n (= 2) cells that are interconnected by the cell-to-cell connecting member 201 and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is the second direction opposite to the first direction. The negative electrode current collecting tabs 32 of the second subgroup (cells B2, B4) are connected to each other by the cell-cell connecting member 201, and the negative electrode current collecting tabs of the first subgroup (cells B1, B3) are connected to each other. The positive electrode current collecting tabs 31 of the 32 and the second subgroup (cells B2, B4) are connected to each other by the cell-to-cell connecting member 202.

The cell-cell connecting member 201 is a plate-shaped metal member, and includes through holes 201a and 201b as shown in FIG. 7B. With the positive electrode current collecting tab 31 of the cell B1 inserted through the through hole 201a and the positive electrode current collecting tab 31 of the cell B3 inserted through the through hole 201b, the positive electrode current collecting tabs 31 and 31 of the cells B1 and B3 are inserted. By welding the cell-to-cell connection member 201, the positive electrode current collecting tab 31 of the cell B1 and the positive electrode current collecting tab 31 of the cell B3 are electrically connected. Further, with the negative electrode current collecting tab 32 of the cell B2 inserted through the through hole 201a and the negative electrode current collecting tab 32 of the cell B4 inserted through the through hole 201b, the negative electrode current collecting tab 32 of the cells B2 and B4, By welding the 32 and the cell-cell connecting member 201, the negative electrode current collecting tab 32 of the cell B2 and the negative electrode current collecting tab 32 of the cell B4 are electrically connected. The cell-cell connecting member 202 is a plate-shaped metal member and includes through holes 202a, 202b, 202c, and 202d as shown in FIG. 7C. The negative electrode current collecting tab 32 of the cell B1 is inserted through the through hole 202a, the negative electrode current collecting tab 32 of the cell B3 is inserted through the through hole 202c, and the positive electrode current collecting tab 31 of the cell B2 is inserted through the through hole 202b. With the positive electrode current collecting tab 31 of the cell B4 inserted through the through hole 202d, the negative electrode current collecting tabs 32 and 32 of the cells B1 and B3 and the positive electrode current collecting tabs 31 and 31 of the cells B2 and B4 and the cell. By welding the inter-connecting member 202, the negative electrode current collecting tab 32 of the cell B1, the negative electrode current collecting tab 32 of the cell B3, the positive electrode current collecting tab 31 of the cell B2, and the positive electrode collection of the cell B4 The electric tab 31 is electrically connected. As the cell-to-cell connecting member used in step S4, a plate-shaped metal member having a through hole through which the current collecting tab can be inserted is provided at a position corresponding to the current collecting tab to which the cell-to-cell connecting member should be connected. It can be preferably used. Preferred examples of the material constituting the cell-cell connecting member include stainless steel, Cu, Fe, Al and the like. In step S4, since there is a gap equivalent to two cells between the current collecting tabs of the same pole, the workability of the work of electrically connecting the cell-to-cell connecting member and the current collecting tab is improved. There is. As a method of welding the cell-cell connecting member and the current collecting tab, known welding methods such as spot welding, laser welding, resistance welding, electromagnetic pressure welding, seam welding, and ultrasonic bonding can be used without particular limitation.

FIG. 8 is an equivalent circuit diagram of the laminated battery 1000. In the laminated battery 1000, the cell-to-cell connection member 201 connected to the positive electrode current collecting tabs 31 and 31 of the cells B1 and B3 functions as the total positive electrode of the laminated battery 1000, and the negative electrode current collecting tab 32 of the cells B2 and B4. The cell-to-cell connecting member 201 connected to 32, 32 functions as a total negative electrode of the laminated battery 1000. In the laminated battery 1000, the single batteries B1 and B3 are connected in parallel, the single batteries B2 and B4 are connected in parallel, the two single batteries B1 and B3 connected in parallel, and the two single batteries connected in parallel. Batteries B2 and B4 are connected in series. That is, n (= 2) cells (B1, B3) of the first subgroup are connected in parallel, and n (= 2) cells (B2, B4) of the second subgroup are connected in parallel. Are connected in parallel, and the first subgroup and the second subgroup are connected in series.

(Other embodiments)
In the above description of the present invention, in the stacking step S3, N = 4 cells are stacked, and in the connecting step S4, 1 or more integers m and 2 or more integers n such that N = 2 mn are m = 1 and n. Assuming that the N (= 4) cells selected as = 2 and stacked in step S3 consist of m (= 1) groups, and that group consists of 2n (= 4) adjacent cells. , N (= 2) cells of the first subgroup are connected in parallel, n (= 2) cells of the second subgroup are connected in parallel, and the first subgroup and the first Although the method S10 for manufacturing a laminated battery in which the two subgroups are connected in series is given as an example, the present invention is not limited to this form. For example, it is possible to use a method for manufacturing a laminated battery in which n is an integer of 3 or more, or a method for manufacturing a laminated battery in which m is an integer of 2 or more.

FIG. 9 is a plan view schematically illustrating a laminated battery 2000 manufactured by the method for manufacturing a laminated battery according to another embodiment. The laminated battery 2000 includes N = 6 cell batteries B1 to B6 (cells 100, respectively) and cell-cell connecting members 2201, 2201, 2202. In the method for manufacturing a laminated battery (S10) in which the laminated battery 2000 is manufactured, in the stacking step (S3), N = 6 cells are aligned with the first surface 20a of each cell (that is,). The first surfaces 20a are laminated so that they face the same direction), and the positive electrode current collecting tabs 31 of the cells are stacked so that the negative electrode current collecting tabs 32 are viewed in opposite directions. Then, in the connection step (S4), one or more integers m and two or more integers n such that N = 2mn are selected as m = 1 and n = 3, and N (= 6) laminated in the lamination step (S3). Assuming that the cells consist of m (= 1) groups and the group consists of 2n (= 6) adjacent cells, n (= 3) cells in the first subgroup. Are connected in parallel, n (= 3) cells of the second subgroup are connected in parallel, and the first subgroup and the second subgroup are connected in series. Specifically, in the connection step (S4), from n (= 3) cell cells (B1, B3, B5) in which the direction in which the negative electrode current collection tab 32 is viewed from the positive electrode current collection tab 31 is the first direction. The positive electrode current collecting tabs 31 of the first subgroup are electrically connected to each other by the cell-cell connecting member 2201, and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is opposite to the first direction. Each negative electrode current collecting tab 32 of the second subgroup consisting of n (= 3) cell cells (B2, B4, B6) in the second direction of the above is electrically connected to each other by the cell-to-cell connecting member 2201. The negative electrode current collecting tabs 32 of the first subgroup (cells B1, B3, B5) and the positive electrode current collecting tabs 31 of the second subgroup (cells B2, B4, B6) are connected between cells. They are electrically connected to each other at 2202.

In the laminated battery 2000, the cell-to-cell connecting members 2201 and 2202 are made of a metal having a through hole through which a current collecting tab to which the inter-cell connecting member should be connected can be inserted, similarly to the cell-to-cell connecting members 201 and 202 described above. A board can be used. Further, as a preferable example of the metal material constituting the cell-cell connecting members 2201 and 2202, the same metal material as those described above for the cell-cell connecting members 201 and 202 can be mentioned.

In the laminated battery 2000, n = 3 cells B1, B3, B5 of the first subgroup are connected in parallel, and n = 3 cells B2, B4, B6 of the second subgroup are connected in parallel. The first subgroup and the second subgroup are connected in series. In the laminated battery 2000, the cell-to-cell connection member 2201 connected to the positive electrode current collecting tabs 31, 31, 31 of the single batteries B1, B3, B5 functions as the total positive electrode of the laminated battery 2000, and the single batteries B2, B4, B6 The cell-to-cell connecting member 2201 connected to the negative electrode current collecting tabs 32, 32, 32 of the above functions as the total negative electrode of the laminated battery 2000. Even in the method of manufacturing a laminated battery of such a form, since there is a gap equivalent to two cells between the current collecting tabs of the same pole in the connection process, the cell-to-cell connecting member and the current collecting tab are electrically connected. The workability of the work of connecting to is improved.

FIG. 10 is a plan view schematically illustrating a laminated battery 3000 manufactured by the method for manufacturing a laminated battery according to another embodiment. The laminated battery 3000 includes N = 8 cell batteries B1 to B8 (cells 100, respectively) and cell-cell connection members 201, 201, 202, 202, and 3203. In the method for manufacturing a laminated battery (S10) in which the laminated battery 3000 is manufactured, in the stacking step (S3), N = 8 cells are aligned with the first surface 20a of each cell (that is,). The first surfaces 20a are laminated so that they face the same direction), and the positive electrode current collecting tabs 31 of the cells are stacked so that the negative electrode current collecting tabs 32 are viewed in opposite directions. Then, in the connection step (S4), one or more integers m and two or more integers n such that N = 2mn are selected as m = 2 and n = 2, and N (= 8) laminated in the lamination step (S3). Assuming that each cell consists of m (= 2) groups G1 and G2 and each group consists of 2n (= 4) adjacent cells, for each group n (1) in the first subgroup. = 2) cells are connected in parallel, n (= 2) cells in the second subgroup are connected in parallel, and the first and second subgroups are connected in series. Will be done. Then, m (= 2) groups G1 and G2 adjacent to each other are connected in series. Specifically, in the group G1, a first unit composed of n (= 2) cell cells (B1, B3) in which the direction of viewing the negative electrode current collecting tab 32 from the positive electrode current collecting tab 31 is the first direction. Each positive electrode current collecting tab 31 of the subgroup is electrically connected to each other by the cell-to-cell connecting member 201, and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is the second direction opposite to the first direction. Each negative electrode current collecting tab 32 of the second subgroup composed of n (= 2) cell cells (B2, B4) oriented is electrically connected to each other by the cell-cell connecting member 3203, and the first sub The negative electrode current collecting tabs 32 of the group (cells B1 and B3) and the positive electrode current collecting tabs 31 of the second subgroup (cells B2 and B4) are electrically connected to each other by the cell-to-cell connecting member 202. .. Further, in the group G2, each of the first subgroups composed of n (= 2) cell cells (B5, B7) in which the direction of viewing the negative electrode current collecting tab 32 from the positive electrode current collecting tab 31 is the first direction. The positive electrode current collecting tab 31 is electrically connected to each other by the cell-cell connecting member 3203, and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is the second direction opposite to the first direction. Each negative electrode current collecting tab 32 of the second subgroup composed of (= 2) cell cells (B6, B8) is electrically connected to each other by the cell-to-cell connecting member 201, and the first subgroup (cell cell cell). The negative electrode current collecting tabs 32 of B5 and B7) and the positive electrode current collecting tabs 31 of the second subgroup (cells B5 and B7) are electrically connected to each other by the cell-to-cell connecting member 202. Further, for all integers k (= 1) satisfying 1 ≦ k ≦ m-1 (= 1), the second subgroup (cell B2) of the k (= 1) th group (G1) from one end. , B4) each negative electrode current collecting tab 32 and each positive electrode current collecting tab 31 of the first subgroup (cells B5, B7) of the k + 1 (= 2) th group (G2) are connected to each other in the cell-to-cell connection member 3203. They are electrically connected to each other.

In the laminated battery 3000, in the group G1, n = 2 cells B1 and B3 of the first subgroup are connected in parallel, and n = 2 cells B2 and B4 of the second subgroup are connected in parallel. The first subgroup (cell B1, B3) and the second subgroup (cells B2, B4) are connected in series. Further, in the group G2, the n = 2 cells B5 and B7 of the first subgroup are connected in parallel, and the n = 2 cells B6 and B8 of the second subgroup are connected in parallel. The first subgroup (cell B5, B7) and the second subgroup (cells B6, B8) are connected in series. In the laminated battery 3000, the negative electrode current collecting tabs 32 of the second subgroups (cells B2 and B4) of the group G1 and the positive electrode current collectors of the first subgroups (cells B5 and B7) of the group G2 are collected. Since the tab 31 is electrically connected by the cell-to-cell connecting member 3203, the group G1 and the group G2 are connected in series. In the laminated battery 3000, the cell-to-cell connecting member 201 connected to each positive electrode current collecting tab 31 of the first subgroup (cells B1 and B3) of the group G1 at one end functions as the total positive electrode of the laminated battery 3000. Then, the cell-to-cell connecting member 201 connected to each negative electrode current collecting tab 32 of the second subgroup (cell B6, B8) of the group G2 at the other end functions as the total negative electrode of the laminated battery 3000. Even in the method of manufacturing a laminated battery of such a form, since there is a gap equivalent to two cells between the current collecting tabs of the same pole in the connection process, the cell-to-cell connecting member and the current collecting tab are electrically connected. The workability of the work of connecting to is improved.

FIG. 11 is a plan view schematically illustrating the cell-to-cell connecting member 3203 used in the manufacture of the laminated battery 3000. The cell-cell connecting member 3203 is a plate-shaped metal member, and as shown in FIG. 11, has through holes 3203a, 3203b, 3203c, and 3203d. The negative electrode current collecting tab 32 of the cell B2 is inserted through the through hole 3203a, the negative electrode current collecting tab 32 of the cell B4 is inserted through the through hole 3203b, and the positive electrode current collecting tab 31 of the cell B5 is inserted through the through hole 3203c. With the positive electrode current collecting tab 31 of the cell B7 inserted through the through hole 3203d, the negative electrode current collecting tabs 32 and 32 of the cells B2 and B4 and the positive electrode current collecting tabs 31 and 31 of the cells B5 and B7 By welding each of the cell-to-cell connecting members 3203, the negative electrode current collecting tab 32 of the cell B2, the negative electrode current collecting tab 32 of the cell B4, the positive electrode current collecting tab 31 of the cell B5, and the positive electrode of the cell B7 The current collecting tabs 31 are electrically connected to each other. As a preferable example of the metal material constituting the cell-cell connecting member 3203, the same metal material as that described above for the cell-cell connecting members 201 and 202 can be mentioned.

FIG. 12 is a plan view schematically illustrating a laminated battery 4000 manufactured by the method for manufacturing a laminated battery according to another embodiment. The laminated battery 4000 includes N = 12 cell batteries B1 to B12 (each cell 100) and cell-cell connection members 201, 201, 202, 202, 202, 3203, 3203. In the method for manufacturing a laminated battery (S10) in which the laminated battery 4000 is manufactured, in the stacking step (S3), N = 12 cells are aligned with the first surface 20a of each cell (that is,). The first surfaces 20a are laminated so that they face the same direction), and the positive electrode current collecting tabs 31 of the cells are stacked so that the negative electrode current collecting tabs 32 are viewed in opposite directions. Then, in the connection step (S4), one or more integers m and two or more integers n such that N = 2mn are selected as m = 3 and n = 2, and N (= 12) laminated in the lamination step (S3). Assuming that each cell consists of m (= 3) groups G1, G2, G3 and each group consists of 2n (= 4) adjacent cells, for each group, the first subgroup. n (= 2) cells are connected in parallel, n (= 2) cells in the second subgroup are connected in parallel, and the first subgroup and the second subgroup are connected in series. Connected to. Then, m (= 3) groups G1, G2, and G3 adjacent to each other are connected in series. Specifically, in the group G1, a first unit composed of n (= 2) cell cells (B1, B3) in which the direction of viewing the negative electrode current collecting tab 32 from the positive electrode current collecting tab 31 is the first direction. Each positive electrode current collecting tab 31 of the subgroup is electrically connected to each other by the cell-to-cell connecting member 201, and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is the second direction opposite to the first direction. Each negative electrode current collecting tab 32 of the second subgroup composed of n (= 2) cell cells (B2, B4) oriented is electrically connected to each other by the cell-cell connecting member 3203, and the first sub The negative electrode current collecting tabs 32 of the group (cells B1 and B3) and the positive electrode current collecting tabs 31 of the second subgroup (cells B2 and B4) are electrically connected to each other by the cell-to-cell connecting member 202. .. Further, in the group G2, each of the first subgroups composed of n (= 2) cell cells (B5, B7) in which the direction of viewing the negative electrode current collecting tab 32 from the positive electrode current collecting tab 31 is the first direction. The positive electrode current collecting tab 31 is electrically connected to each other by the cell-cell connecting member 3203, and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is the second direction opposite to the first direction. Each negative electrode current collecting tab 32 of the second subgroup composed of (= 2) cell cells (B6, B8) is electrically connected to each other by the cell-to-cell connecting member 3203, and the first subgroup (cell cell cell). The negative electrode current collecting tabs 32 of B5 and B7) and the positive electrode current collecting tabs 31 of the second subgroup (cells B5 and B7) are electrically connected to each other by the cell-to-cell connecting member 202. Further, in the group G3, each of the first subgroups composed of n (= 2) cell cells (B9, B11) in which the direction of viewing the negative electrode current collecting tab 32 from the positive electrode current collecting tab 31 is the first direction. The positive electrode current collecting tab 31 is electrically connected to each other by the cell-cell connecting member 3203, and the direction in which the negative electrode current collecting tab 32 is viewed from the positive electrode current collecting tab 31 is the second direction opposite to the first direction. Each negative electrode current collecting tab 32 of the second subgroup composed of (= 2) cell cells (B10, B12) is electrically connected to each other by the cell-to-cell connecting member 201, and the first subgroup (cell cell cell). The negative electrode current collecting tabs 32 of B9 and B11) and the positive electrode current collecting tabs 31 of the second subgroup (cells B9 and B12) are electrically connected to each other by the cell-to-cell connecting member 202. Further, for all the integers k (= 1, 2) satisfying 1 ≦ k ≦ m-1 (= 2), the negative electrode current collecting tabs 32 and k + 1 of the second subgroup of the kth group from one end. Each positive electrode current collecting tab 31 of the first subgroup of the second group is electrically connected to each other by the cell-to-cell connecting member 3203. Specifically, for k = 1, each negative electrode current collecting tab 32 and k + 1 (= 2) of the second subgroup (cell B2, B4) of the k (= 1) th group (G1) from one end. ) The positive electrode current collecting tabs 31 of the first subgroups (cells B5 and B7) of the third group (G2) are electrically connected to each other by the cell-to-cell connecting member 3203. Regarding k = 2, each negative electrode current collecting tab 32 and k + 1 (= 3) th group of the second subgroup (cell B6, B8) of the k (= 2) th group (G2) from one end. The positive electrode current collecting tabs 31 of the first subgroup (cells B9, B11) of (G3) are electrically connected to each other by the cell-cell connecting member 3203.

In the laminated battery 4000, in the group G1, n = 2 cells B1 and B3 of the first subgroup are connected in parallel, and n = 2 cells B2 and B4 of the second subgroup are connected in parallel. The first subgroup (cell B1, B3) and the second subgroup (cells B2, B4) are connected in series. Further, in the group G2, the n = 2 cells B5 and B7 of the first subgroup are connected in parallel, and the n = 2 cells B6 and B8 of the second subgroup are connected in parallel. The first subgroup (cell B5, B7) and the second subgroup (cells B6, B8) are connected in series. Further, in the group G3, n = 2 cells B9 and B11 of the first subgroup are connected in parallel, and n = 2 cells B10 and B12 of the second subgroup are connected in parallel. The first subgroup (cell B9, B11) and the second subgroup (cells B10, B12) are connected in series. In the laminated battery 4000, the negative electrode current collection tabs 32 of the second subgroups (cells B2 and B4) of the group G1 and the positive electrode current collections of the first subgroups (cells B5 and B7) of the group G2 are collected. The tab 31 is electrically connected by the cell-to-cell connecting member 3203, and each negative electrode current collecting tab 32 of the second subgroup (cell B6, B8) of the group G2 and the first subgroup (cell) of the group G3. Since the positive electrode current collecting tabs 31 of B9 and B11) are electrically connected by the cell-cell connecting member 3203, m (= 3) adjacent groups G1, G2, and G3 are connected in series. ing. In the laminated battery 4000, the cell-to-cell connecting member 201 connected to each positive electrode current collecting tab 31 of the first subgroup (cells B1 and B3) of the group G1 at one end functions as the total positive electrode of the laminated battery 4000. Then, the cell-to-cell connecting member 201 connected to each negative electrode current collecting tab 32 of the second subgroup (cell B10, B12) of the group G3 at the other end functions as the total negative electrode of the laminated battery 4000. Even in the method of manufacturing a laminated battery of such a form, since there is a gap equivalent to two cells between the current collecting tabs of the same pole in the connection process, the cell-to-cell connecting member and the current collecting tab are electrically connected. The workability of the work of connecting to is improved.

In the above description of the present invention, with respect to the number of cells N = 12 stacked in the stacking step (S3), 1 or more integers m and 2 or more integers n such that N = 2 mn are m = 3 and n. Selected as = 2, the N (= 12) cells consist of m (= 3) groups G1, G2, G3, and each group consists of 2n (= 4) adjacent cells. As a result, for each group, n (= 2) cells of the first subgroup are connected in parallel, n (= 2) cells of the second subgroup are connected in parallel, and the first A method for manufacturing a laminated battery (4000) in which the subgroup and the second subgroup are connected in series, and m (= 3) adjacent groups G1, G2, and G3 are connected in series. As an example, the present invention is not limited to this form. In general, a set of an integer m of 1 or more and an integer n of 2 or more such that N = 2 mn for an even number N of 4 or more is not always unique. For example, for N = 12, for the number of cells N = 12 stacked in the stacking step (S3), an integer m of 1 or more and an integer n of 2 or more such that N = 2mn is m = 2. And n = 3, the N (= 12) cells consist of m (= 2) groups G1 and G2, and each group consists of 2n (= 6) adjacent cells. As a result, for each group, n (= 3) cells of the first subgroup are connected in parallel, n (= 3) cells of the second subgroup are connected in parallel, and the first It is also possible to use a method for manufacturing a laminated battery in which the subgroup and the second subgroup are connected in series, and m (= 2) adjacent groups are connected in series. Further, for example, for N = 12, 1 or more integers m and 2 or more integers n such that N = 2 mn are m = with respect to the number of cells N = 12 laminated in the stacking step (S3). Assuming that 1 and n = 6 are selected, the N (= 12) cells consist of m (= 1) groups G1 and each group consists of 2n (= 12) adjacent cells. , For each group, n (= 6) cells of the first subgroup are connected in parallel, n (= 6) cells of the second subgroup are connected in parallel, and the first It is also possible to use a method for manufacturing a laminated battery in which a subgroup and a second subgroup are connected in series.

In the above description of the present invention, when m ≧ 2, for all the integers k satisfying 1 ≦ k ≦ m-1, each negative electrode current collecting tab and k + 1 of the second subgroup of the kth group from one end. Electrical connection between each positive electrode collection tab in the first subgroup of the second group, electrical connection between each negative electrode collection tab in the second subgroup of the kth group, and k + 1th group The method of manufacturing a laminated battery (3000, 4000) in which the electrical connection between the positive electrode current collecting tabs of the first subgroup is performed by using a single cell-to-cell connecting member 3203 is given as an example. The invention is not limited to this form. For example, the electrical connection between each negative electrode collection tab in the second subgroup of the kth group from one end and each positive electrode current collection tab in the first subgroup of the k + 1st group, the kth group. The electrical connection between the negative electrode current collecting tabs of the second subgroup and the electrical connection between the positive electrode current collecting tabs of the first subgroup of the k + 1th group are made by using separate cell-to-cell connection members. It is also possible to use the method of manufacturing a laminated battery in the form of the above. For example, in realizing the connection form of the laminated battery 3000, the negative electrode current collecting tabs 32, 32 of the second subgroup of the group G1 first from one end are connected to each other by using the cell-to-cell connection member 201. At the same time, the positive electrode current collecting tabs 31 and 31 of the first subgroup of the second group G2 from one end are connected to each other by using the cell-to-cell connecting member 201, and then the second subgroup of the group G1. The cell-cell connecting member 201 connecting the negative electrode current collecting tabs 32 and 32 of the above, and the cell-cell connecting member 201 connecting the positive electrode current collecting tabs 31 and 31 of the first subgroup of the group G2, etc. The negative electrode current collecting tabs 32 and 32 of the second subgroup of the group G1 and the positive electrode current collecting tabs 31 and 31 of the first subgroup of the group G2 are also connected to each other by using the cell-cell connecting member of the above. It is possible to connect electrically.

In the above description of the present invention, the stack of cells obtained in the stacking step S3 is the first end portion in which the cells of the first subgroup appear in the stacking direction, and the second subgroup. It has a second end where a cell cell appears, and in the connection step S4, when m ≧ 2, all the integers k satisfying 1 ≦ k ≦ m-1 are kth from the first end. Each negative electrode current collection tab of the second subgroup of the group and each positive electrode current collection tab of the first subgroup of the k + 1st group from the first end are electrically connected to each other by an inter-cell connecting member. Although a method for manufacturing a laminated battery (3000, 4000) in a connected form has been given as an example, the present invention is not limited to this form. For example, in the connection step S4, when m ≧ 2, for all integers k satisfying 1 ≦ k ≦ m-1, each negative electrode current collection tab of the second subgroup of the kth group from the second end. It is also possible to use a method for manufacturing a laminated battery in which the positive electrode current collecting tabs of the first subgroup of the k + 1st group from the second end are electrically connected to each other by an inter-cell connecting member. It is possible.

In the above description of the present invention, the method S10 for manufacturing a laminated battery in which the cell-cell connection member and the current collecting tab are electrically connected by welding in the connection step S4 is given as an example, but the present invention is limited to this mode. Not done. For example, in the connection step, it is also possible to use a method for manufacturing a laminated battery in which the cell-to-cell connection member and the current collecting tab are electrically connected by a method other than welding (for example, brazing).

In the above description of the present invention, the cell 100 in which the positive electrode current collector 11 is directly connected to the positive electrode current collector tab 31 and the negative electrode current collector 15 is directly connected to the negative electrode current collector tab 32 in the cell manufacturing step S2. Although the production method S10 in the form of producing the above is given as an example, the present invention is not limited to this form. For example, in the cell manufacturing process, the positive electrode current collector is electrically connected to the positive electrode current collector tab via another conductive member, and the negative electrode current collector is connected to the negative electrode current collector tab via the other conductive member. It is also possible to use a method for manufacturing a laminated battery in a form of being electrically connected.

In the above description of the present invention, the manufacturing method S10 in which the cell 100 including the power generation element 10 composed of one elementary battery 1 is manufactured in the cell manufacturing step S2 is given as an example, but the present invention is limited to this embodiment. Not done. The number of elementary batteries (laminated structure) 1 included in the power generation element 10 may be any number of 2 or more. For example, it is also possible to use a method for manufacturing a laminated battery in which a cell 100 including a power generation element 10'consisting of six elementary batteries 1 is manufactured in the cell manufacturing step. However, from the viewpoint of facilitating the suppression of warpage of the power generation element, the number of elementary batteries 1 stacked and integrated may be an even number (2, 4, 6, ..., Etc.). preferable.

In the above description of the present invention, in connection with the power generation element manufacturing step S1, all the sets of adjacent elementary batteries 1 and 1 share a current collector (positive electrode current collector 11 or negative electrode current collector 15). Although the integrated power generation element 10'was given as an example, the power generation element manufactured in the present invention is not limited to this form. For example, in the power generation element manufacturing process, one set of elementary batteries in which a predetermined number of elementary batteries 1, 1, ... Are integrally laminated and the other elementary battery in which a predetermined number of elementary batteries 1, 1, ... Are integrally laminated. It is also possible to use a method for manufacturing a laminated battery in which a power generation element in which the current collector is not shared with the battery set is manufactured.

In the above description of the present invention, the power generation element 10'in which all the elementary batteries 1, 1, ... Are electrically connected in parallel is given as an example in relation to the power generation element manufacturing step S1, but the power generation element 10'is manufactured in the present invention. The power generation element to be generated is not limited to this form. For example, it is also possible to use a method for manufacturing a laminated battery in which a power generation element including a plurality of elementary batteries electrically connected in series in the power generation element manufacturing process is manufactured.

In the above description of the present invention, in the cell manufacturing step S2, the positive electrode current collecting tab 31 is a straight line parallel to the first straight line L1 on the first surface 20a and is on the longitudinal direction X of the first surface 20a. A straight line L2 having the same distance from one end E1 and the first straight line L1 is arranged between the one end E1 and the negative electrode current collecting tab 32 is placed on the first surface 20a. It is arranged between a straight line L3 that is parallel to the straight line L1 and has the same distance from the other end E2 and the first straight line L1 in the longitudinal direction X of the first surface 20a, and the first straight line L1. Although the method S10 for manufacturing a laminated battery in the form of manufacturing the cell 100 is taken as an example, the present invention is not limited to this form. For example, in the cell manufacturing step S2, the negative electrode current collecting tab 32 is a straight line parallel to the first straight line L1 on the first surface 20a, and one end E1 in the longitudinal direction X of the first surface 20a. And a straight line L2 having the same distance from the first straight line L1 and one end E1 thereof, the positive voltage collecting tab 31 is parallel to the first straight line L1 on the first surface 20a. A cell cell arranged between a straight line L3 which is a straight line and has the same distance from the other end E2 and the first straight line L1 in the longitudinal direction X of the first surface 20a and the first straight line L1. It is also possible to use a method for manufacturing a laminated battery in a form to be manufactured.

In the above description of the present invention, in the cell manufacturing step S2, one of the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 (the positive electrode current collecting tab 31 in the cell 100) is on the first surface 20a. A straight line L2 parallel to the first straight line L1 and having the same distance from one end E1 and the first straight line L1 in the longitudinal direction X of the first surface 20a, and the one end E1. Arranged between them, the other side of the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 (the negative electrode current collecting tab 32 in the cell 100) is a straight line parallel to the first straight line L1 on the first surface 20a. A cell 100 is produced which is arranged between a straight line L3 having the same distance from the other end E2 and the first straight line L1 in the longitudinal direction X of the first surface 20a and the first straight line L1. Although the method S10 for manufacturing a laminated battery in the form of the above is given as an example, the present invention is not limited to this form. For example, the method of manufacturing a laminated battery includes a cell cell manufacturing step of manufacturing a cell cell in which one of the positive electrode current collecting tab and the negative electrode current collecting tab is arranged at a position where a straight line L2 or a straight line L3 passes. Is also possible. However, in each cell, the positive electrode current collecting tab and the negative electrode current collecting tab are viewed from the side (that is, the straight line L1 is the line of sight) in which the stacked cells in the stacking step S3 are seen in the stacking direction (in FIG. In the side view.), Each positive electrode current collecting tab and each negative electrode current collecting tab are separated from each other in the longitudinal direction of the first surface, and each positive electrode current collecting tab and each second positive electrode current collecting tab of each first subgroup are separated from each other. Each positive electrode current collecting tab of each subgroup is separated in the longitudinal direction of the first surface, and each negative electrode current collecting tab of each first subgroup and each negative electrode current collecting tab of each second subgroup. It is preferable that the and are arranged so as to be separated from each other in the longitudinal direction of the first surface.

1 Elementary battery 10, 10'Power generation element 11 Positive electrode current collector 12 Positive electrode layer 13 Separator layer 14 Negative electrode layer 15 Negative electrode current collector 20 Exterior body 20a First surface 31 Positive electrode current collector tab 32 Negative electrode current collector tab 100 (B1 to B1 B12) Single battery 201, 202, 2201, 2202, 3203 Cell-to-cell connection member 1000, 2000, 3000, 4000 Stacked battery G1, G2, G3 group

Claims (1)

A power generation element manufacturing process for manufacturing a power generation element including one or more laminated structures including a positive electrode current collector, a positive electrode layer, a separator layer, a negative electrode layer, and a negative electrode current collector in this order.
After connecting the positive electrode current collector tab to one or more positive electrode current collectors of the power generation element and connecting the negative electrode current collector tab to one or more negative electrode current collectors of the power generation element, the power generation element is attached to the exterior body. A step of manufacturing a square cell by encapsulation, wherein the exterior body has a first surface having a longitudinal direction and a lateral direction, and from the first surface, the positive electrode current collecting tab and the negative electrode. The current collecting tab projects to the outside of the exterior body, and the positive electrode current collecting tab and the negative electrode current collecting tab pass through the midpoints of the two longitudinal sides of the first surface on the first surface. The cell manufacturing process, in which the distances from the straight lines are arranged at different positions,
4 or more even-numbered cells are arranged so that the first surfaces of the cells are aligned and the directions of viewing the negative electrode current collecting tabs from the positive electrode current collecting tabs of each cell are alternately reversed. Laminating process and laminating process
A method for manufacturing a laminated battery, which comprises a connection step of connecting at least two adjacent current collecting tabs of the same pole of a cell with a cell-to-cell connecting member.

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