JP5375558B2 - Assembled battery and manufacturing method of assembled battery - Google Patents

Description

  The present invention relates to an assembled battery and a method for manufacturing the assembled battery.

  In recent years, from the viewpoint of protecting the global environment, a secondary battery having a high output and a high capacity is required to be applied to an electric vehicle or a hybrid vehicle as a low pollution vehicle. Further, with the increase in output and capacity of the secondary battery, further improvement in safety is required.

  The secondary battery includes a positive electrode layer and a negative electrode layer, and an electrolyte layer disposed therebetween, and the electrolyte layer is configured by a non-aqueous liquid electrolyte or a solid electrolyte. Among these, in particular, when a solid electrolyte is used as the electrolyte, the solid electrolyte is essentially non-flammable, and thus it is easy to improve safety.

  In order to increase the output and capacity of a secondary battery, it is effective to electrically connect a plurality of power generation units (or single cells) to form an assembled battery housed in the same housing or laminate pack. It is. On the other hand, if the battery has a high output and a high capacity as an assembled battery, the amount of heat generated during overcharging and the like increases, so the battery can be short-circuited in units of the assembled battery during overcharging. The safety of the can be further increased. For example, Patent Document 1 proposes an assembled battery in which a plurality of flat unit cells are stacked and accommodated in a battery package. The assembled battery of Patent Document 1 is constrained collectively on one end side and is constrained collectively on the other end side in gaps between a plurality of positive electrode current collectors that extend away from each other toward the other end side. And a plurality of negative electrode current collectors extending apart from each other and a solid electrolyte.

JP 2004-303535 A

  In Patent Document 1, a plurality of flat unit cells are stacked in a complicated form as described above, and housed in a battery package to form an assembled battery, thereby reducing resistance at a connection point of the plurality of unit cells. In addition, it is said that an assembled battery of flat unit cells having relatively high energy efficiency can be obtained. However, in the assembled battery of Patent Document 1, there is a possibility that the single cells (power generation units) may be shifted during or after manufacturing the battery, resulting in a decrease in battery performance such as a short circuit. Moreover, since it was set as the complicated form as mentioned above, the positioning at the time of lamination | stacking was not easy, and there existed a subject in the assembly | attachment property of a battery.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the assembled battery which can suppress the position shift of an electric power generation part, and is excellent in assemblability, or its manufacturing method.

In order to solve the above problems, the present invention has the following configuration. That is,
In the first aspect of the present invention, a plurality of power generation units are connected via a current collector to form a connection body, and the current collector as one end and the current collector as the other end of the connection body are connected via an insulating part. In this case, the battery pack is a battery assembly in which a connecting body connected through the insulating portion is assembled in a housing or a laminate pack .

  In the first aspect of the present invention, the “power generation unit” is one that can take out electrical energy to the outside by an electrochemical reaction in the positive electrode and the negative electrode, and is a laminated battery such as a single battery, a single battery pack, a laminated monopolar battery, or a laminated bipolar battery. The form of the battery, such as a battery pack or a pack thereof, or a wound battery, is not particularly limited. The “connected body” is not particularly limited as long as it is formed by connecting a plurality of power generation units through current collectors. For example, a plurality of power generation units are electrically connected in series by a current collector. The thing formed by connecting to can be mentioned. The “insulating part” is a part made of an insulator, and one end and the other end of the connecting body are connected via the insulating part.

  In the first aspect of the present invention, the positive electrode side terminal and the negative electrode side terminal are provided via the insulating portion, the current collector as one end of the coupling body is the positive electrode side terminal, and the current collector as the other end is the negative electrode side terminal. It is preferable that they are connected. This is because the positive and negative electrode terminals can be gathered in one place, and an assembled battery with better assembly can be obtained.

In the first invention, the insulating portion, an insulator attached to one end, it is preferable and attached to the other insulator by thermally melting those constructed by forming wear each other. This is because the insulating part can be easily integrated, and the assembled battery can be more excellent in assemblability.

In the first aspect of the present invention, the insulating portion may be integrated by fitting together an insulator attached to one end and an insulator attached to the other end . This is because the insulating part can be easily integrated, and the assembled battery can be more excellent in assemblability.

  In the first aspect of the present invention, the insulating portion is polyvinylidene chloride, nylon 6, nylon 66, nylon 6/10, nylon 12, polyetherimide, polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polytetrafluoroethylene. Or it is preferable to consist of any 1 or more types chosen from chlorotrifluoroethylene. This is because the above-described heat melting can be performed appropriately, or a fitting part for fitting can be easily formed, and an assembled battery with more excellent assemblability can be obtained.

The second aspect of the present invention is a connected body manufacturing step of connecting a plurality of power generation units via a current collector to form a connected body, and a current collector that is one end and a current collector that is the other end of the connected body, Connecting through the insulating part, the end connecting step, and a step of assembling the connection body obtained through the end connecting step, connected through the insulating part, into the housing or the laminate pack . It is a manufacturing method of an assembled battery.

  In the second aspect of the present invention, it is preferable to further include a terminal connection step of connecting the current collector as one end of the coupling body to the positive electrode side terminal and connecting the current collector as the other end to the negative electrode side terminal. This is because the positive and negative terminals can be combined in one place, and the battery can be assembled more easily.

  In the second aspect of the present invention in which a positive electrode terminal and a negative electrode terminal are provided, an insulator is attached to the positive electrode side terminal, an insulator is attached to the negative electrode side terminal, and the insulators are bonded together by heat melting. It is preferable that It is because an insulating part can be integrated easily and the assembled battery becomes easier. Moreover, it is because the positive / negative terminal can be gathered in one place, and the assembly | attachment property of a battery becomes easier.

  In the second aspect of the present invention in which a positive electrode terminal and a negative electrode terminal are provided, an insulator is attached to the positive electrode side terminal, an insulator is attached to the negative electrode side terminal, and the insulators are integrated by fitting, and the above-described insulating portion Also good. It is because an insulating part can be integrated easily and the assembled battery becomes easier. Moreover, it is because the positive / negative terminal can be put together in one place, and the battery can be assembled more easily.

  In the second aspect of the present invention, the insulating portion is polyvinylidene chloride, nylon 6, nylon 66, nylon 6/10, nylon 12, polyetherimide, polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polytetrafluoroethylene. Alternatively, it is preferably composed of one or more of chlorotrifluoroethylene. This is because the above-described heat melting can be performed appropriately, or a fitting part for fitting can be easily formed, and an assembled battery with more excellent assemblability can be obtained.

  According to the first aspect of the present invention, the plurality of power generation units are connected via the current collector, and one end and the other end of the connection body are connected via the insulator. By fixing to the other end, the plurality of power generation units are positioned and fixed, and positional deviation between the power generation units can be suppressed, so that an assembled battery excellent in assemblability can be obtained.

  According to the second aspect of the present invention, an assembled battery is manufactured by connecting a plurality of power generation units via a current collector and connecting one end and the other end of the connection body via an insulator. By fixing the one end and the other end of the body, the plurality of power generation units can be easily positioned and fixed, and the positional deviation between the power generation units is suppressed and can be easily assembled.

It is the schematic for demonstrating the assembled battery of this invention which concerns on 1st Embodiment. It is the schematic for demonstrating the assembled battery of this invention which concerns on 1st Embodiment. It is the schematic for demonstrating an insulation part and a terminal part. It is the schematic for demonstrating the assembled battery of this invention which concerns on 2nd Embodiment. It is the schematic for demonstrating the assembled battery of this invention which concerns on 2nd Embodiment. It is the schematic for demonstrating an insulation part and a terminal part. It is a flowchart which shows an example of the manufacturing method of an assembled battery.

  Hereinafter, the present invention will be described in detail by exemplifying an all solid lithium secondary battery. However, the present invention is not limited to the embodiment and can be applied to various assembled batteries.

1. 1st Embodiment The structure of the assembled battery 100 of this invention which concerns on 1st Embodiment in FIGS. 1-3 is shown roughly. 1-3, a housing | casing or a battery pack, wiring, etc. are abbreviate | omitted for description. As shown in FIGS. 1 and 2, the assembled battery 100 includes a plurality of power generation units 10, 10,... Connected via current collectors 20, 20,. A current collector 20 a serving as one end of the current collector 30 and a current collector 20 e serving as the other end are connected to each other via an insulating unit 50. The insulating part 50 is fixed to the pedestals 53 and 54. The pedestals 53 and 54 have positive and negative terminals 51 and 52 (positive terminal tip 51a, terminal foil 51b, A negative terminal tip 52a and a terminal foil 52b) are provided. The positive terminal 51 and the negative terminal 52 have terminal tips 51a and 52a connected to wirings (not shown) inside or outside the bases 53 and 54, respectively, and the wirings are connected to the terminal foils 51b and 52b. It is connected and protrudes from the pedestals 53 and 54 to the coupling body 30 side. The current collector 20a of the connection body 50 is connected to the terminal foil 51b, and the current collector 20e of the connection body 50 is connected to the terminal foil 52b, whereby the connection body 30 and each of the terminals 51 and 52 are connected. The electric energy generated in the power generation units 10, 10,... Can be taken out via the terminals 51, 52, or can be short-circuited when the assembled battery 100 is overcharged. Further, as shown in FIG. 1, an insulator 40 is provided so as to be interposed between the power generation unit 10 a and the power generation unit 10 d facing each other and between the power generation unit 10 b and the power generation unit 10 c facing each other. .. Prevents short circuit due to unnecessary contact between 10, 10,... Further, as shown in FIGS. 2 and 3, the insulating portion 50 is formed by binding the insulators 50 a and 50 b to each other by thermal melting.

<Power generation unit 10>
The power generation unit 10 is not particularly limited as long as it can extract electric energy to the outside by an electrochemical reaction. For example, the positive electrode current collector and the positive electrode layer provided on the positive electrode current collector, the negative electrode current collector and the negative electrode layer provided on the negative electrode current collector, and the positive electrode layer and the negative electrode layer are interposed. It can be set as the electric power generation part which has the provided solid electrolyte layer.

(Positive electrode layer, negative electrode layer)
The positive electrode layer and the negative electrode layer provided in the power generation unit 10 are layers including an active material and an electrolyte, and optionally including a conductive additive and a binder. When the assembled battery 100 is an all-solid lithium secondary battery, the active materials include LiCoO ₂ , LiNiO ₂ , Li _{1 + x} Ni _1/3 Mn _1/3 Co _1/3 O ₂ , LiMn ₂ O ₄ , Li _{1 + x} Heterogeneous element-substituted Li—Mn spinel, Li _x TiO _y , LiMPO ₄ (M is represented by Mn _2−xy M _y O ₄ (M is any of Al, Mg, Co, Fe, Ni, Zn)) Fe, Mn, Co, or Ni), V ₂ O ₅ , MoO ₃ , TiS ₂ , graphite, carbon materials such as hard carbon, LiCoN, Li _x Si _y O _z , lithium metal or lithium alloy (LiM, M is Sn, Si, Al, Ge, Sb, or the like P), lithium storage intermetallic compound _(Mg x M, M is Sn, Ge, either Sb, _or, N y Sb, It can be used an In, Cu, or) or Mn, these derivatives. Here, there is no clear distinction between the positive electrode active material and the negative electrode active material, and the positive and negative potential layers are compared with the charge and discharge potentials of the two types of compounds. Can be used to construct a lithium secondary battery having an arbitrary voltage. When the assembled battery 100 is an all-solid lithium secondary battery, a solid electrolyte is used as the electrolyte. Specifically, an oxide-based amorphous solid electrolyte such as Li ₂ O—B ₂ O ₃ —P ₂ O ₅ , Li ₂ O—SiO ₂ , Li ₂ O—B ₂ O ₃ —ZnO, Li ₂ S _{-SiS 2, LiI-Li 2 S} -SiS 2, LiI-Li 2 S-P 2 S 5, LiI-Li 2 S-B 2 S 3, Li 3 PO 4 -Li 2 S-Si 2 S, Li 3 _{PO 4 -Li 2 S-SiS 2} , LiPO 4 -Li 2 S-SiS, LiI-Li 2 S-P 2 O 5, LiI-Li 3 PO 4 -P 2 S 5, Li 2 S-P 2 S 5 Sulfide-based amorphous solid electrolyte such as LiI, LiI-Al ₂ O ₃ , Li ₃ N, Li ₃ N-LiI-LiOH, etc., Li _1.3 Al _0.3 Ti _0.7 (PO _{4) 3, Li 1 + x} + y A x Ti 2-x Si y P 3-y O ₂ (A is Al or Ga, 0 ≦ x ≦ 0.4,0 < y ≦ 0.6), [(B 1/2 Li 1/2) 1-z C z] TiO 3 (B is La, Pr , Nd, or Sm, C is Sr or Ba, 0 ≦ z ≦ 0.5), Li ₅ La ₃ Ta ₂ O ₁₂ , Li ₇ La ₃ Zr ₂ O ₁₂ , Li ₆ BaLa ₂ Ta ₂ O ₁₂ , Crystalline oxides and oxynitrides such as Li ₃ PO _{(4-3 / 2w)} N _w (w <1) and Li _3.6 Si _0.6 P _0.4 O ₄ can be used. On the other hand, as the conductive auxiliary agent, a conventional one can be used without particular limitation, and for example, a carbon material such as acetylene black is preferably used. As the binder, conventional ones can be used without any particular limitation. For example, it is preferable to use a fluororesin such as polyvinylidene fluoride or a rubbery resin such as styrene butadiene rubber (SBR). The mixing ratio of each substance included in the positive electrode layer and the negative electrode layer is not particularly limited as long as the assembled battery 100 can be operated appropriately. For example, it can be made into the mixing ratio of active material: electrolyte: conductive auxiliary agent: binder = 99-40: 1-50: 0: 0-5: 0-5 by mass ratio. In addition, the thickness and shape of the positive electrode layer and the negative electrode layer are not particularly limited as long as the positive electrode layer and the negative electrode layer are appropriately formed on the positive electrode current collector and the negative electrode current collector described later. For example, the thickness can be about 5 to 500 μm. The positive electrode layer and the negative electrode layer can be formed by applying and drying a paste containing the above active material or the like on a positive electrode current collector or a negative electrode current collector with a doctor blade or the like, or pressing the powdered active material or the like. By doing so, it can be formed and produced.

(Solid electrolyte layer)
The solid electrolyte layer is a layer containing an electrolyte and, optionally, a binder. When the assembled battery 100 is an all-solid lithium secondary battery, the above-described solid electrolyte can be used as the solid electrolyte. The same binder as described above can be used. The mixing ratio of each substance included in the solid electrolyte layer is not particularly limited as long as it is a ratio that allows the assembled battery 100 to operate appropriately. For example, it can be set as the mixing ratio of electrolyte: binder = 100-70: 0-30 by mass ratio. The thickness and shape of the solid electrolyte layer are not particularly limited as long as the solid electrolyte layer is appropriately provided between the positive electrode layer and the negative electrode layer and can contribute to ion conduction between the positive electrode layer and the negative electrode layer. It is not something. For example, the thickness can be about 0.1 to 500 μm. The electrolyte layer is formed and produced by applying and drying a paste containing the electrolyte or the like on the positive electrode layer or the negative electrode layer with a doctor blade or the like, or by press molding the powdery solid electrolyte or the like. be able to.

(Positive electrode current collector, negative electrode current collector)
The material of the positive electrode current collector and the negative electrode current collector is not particularly limited as long as the current collector can be applied to an all-solid lithium secondary battery. For example, metal foil, a metal mesh, a metal vapor deposition film, etc. can be used. Specifically, Cu, Ni, Al, V, Au, Pt, Mg, Fe, Ti, Co, Zn, Ge, In, stainless steel and other metal foils and meshes, or polyamide, polyimide, PET, PPS, A film made of polypropylene or the like, a glass, a silicon plate, or the like deposited on the metal can be used. The thickness and size of the positive electrode current collector and the negative electrode current collector are not particularly limited. For example, the thickness can be about 5 to 500 μm. Note that a positive electrode lead, a negative electrode lead, or the like may be optionally attached to the positive electrode current collector and the negative electrode current collector.

  The power generation unit 10 only needs to include the constituent units of the positive electrode layer, the electrolyte layer, and the negative electrode layer, and the positive electrode current collector and the negative electrode current collector, and may be a monopolar battery or a bipolar battery. Good. In addition, a stacked battery in which a plurality of the structural units are stacked via a current collector may be used, or a battery in which the structural units are wound via a current collector may be used. Further, the power generation unit 10 may have a form in which each of the above layers is exposed, or may be housed in a battery pack or the like. As the battery pack, a known laminate film (laminated film of resin and aluminum foil) or the like can be used. However, in the case where each layer of the power generation unit 10 is exposed, as shown in FIG. 1, the power generation units 10 may come into contact with each other in order to prevent a short circuit due to unnecessary contact between the power generation units 10. It is better to provide an insulator 40, which will be described later, at a certain position.

<Current collector 20>
In the assembled battery 100, a plurality of power generation units 10, 10,... Are connected through current collectors 20, 20,. As the current collector 20, as long as it can connect the positive electrode (positive electrode current collector) of one power generation unit 10 and the negative electrode (negative electrode current collector) of another power generation unit 10, the material, shape, and size thereof can be used. Etc. are not particularly limited, and the same materials as the positive electrode current collector and the negative electrode current collector described above can be used. Regarding the connection between the current collector 20 and the power generation unit 10, in addition to welding by welding or the like, the positive electrode current collector and the negative electrode current collector used in the above-described power generation unit can also be used as the current collector 20. For example, in FIGS. 1 and 2, when focusing on the power generation unit 10a, the positive electrode current collector provided in the power generation unit 10a may be used as the current collector 20a, and the negative electrode current collector may be used as the current collector 20b. it can. The current collector 20b that is also used as the negative electrode current collector of the power generation unit 10a can also be used as the positive electrode current collector of the power generation unit 10b. That is, in one adjacent power generation unit 10 and another power generation unit 10, a positive current collector of one power generation unit 10 and a negative current collector of another power generation unit 10 are configured by a common current collector 20. can do.

<Connected body 30>
A plurality of power generation units 10, 10,... Are connected via the current collectors 20, 20,. For example, as shown in FIGS. 1 and 2, a power generator 10 a, 10 b,..., 10 d is electrically connected in series by current collectors 20 a, 20 b,. be able to. In FIG. 2, the length of the current collector 20 in the longitudinal direction of the connector 30 (length X in FIG. 2) is preferably about 2 to 50 mm. As shown in FIG. 2, the connecting body 30 is a long connecting body in which the power generation units 10, 10,... Are connected in one direction, and when the battery is assembled, as shown in FIG. The current collector 20 a that is one end of the current collector and the current collector 20 e that is the other end are connected via the terminals 51 and 52 and the insulating portion 50.

(Insulator 40)
The insulator 40 is an insulating member provided at a place where the power generation units 10, 10,. As long as the insulator 40 is made of an insulating material, the material is not particularly limited. Further, the shape and size of the insulator 40 are not particularly limited as long as the shape and size are appropriately provided in a place where the power generation units 10, 10,. In FIG. 1, an insulator 40 is provided inside the annularly connected body 30 so as to be sandwiched between the power generation units 10 and 10. In addition, when each of the power generation units 10, 10,... Is formed as a battery pack by an exterior body or the like, the insulator 40 is not necessarily provided.

<Insulating part 50>
The insulating part 50 is a part made of an insulator, and as shown in FIG. 1, the current collector 20a that is one end of the coupling body 30 and the current collector 20e that is the other end are connected via a terminal 51 or the like. Connected. In the assembled battery 100, the positive electrode side terminal 51 and the negative electrode side terminal 52 are provided so as to be separated from each other via the insulating unit 50. The material of insulating part 50 (insulators 50a and 50b in FIG. 2) is not particularly limited as long as it can connect one end and the other end of connecting body 30 and can be insulated. In view of the heat melting property, and when the assembled battery 100 is an all-solid lithium secondary battery, considering alkali resistance and the like, polyvinylidene chloride, nylon 6, nylon 66, nylon 6/10, nylon 12, polyetherimide, Those composed of at least one of polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polytetrafluoroethylene and chlorotrifluoroethylene are preferred. Among these, those composed of polyetherimide, polyethylene terephthalate or polyvinylidene chloride are particularly preferable. The shape and size of the insulating part 50 are not particularly limited as long as the current collector 20a and the current collector 20e can be appropriately connected to each other via the terminal 31 or the like. For example, an insulating sheet having a thickness of about 0.02 mm can be cut into an appropriate size (for example, a substantially rectangular shape having a side of 5 to 500 mm), and the cut insulating sheets can be used as the insulators 50a and 50b. The insulators 50a and 50b are attached to the terminals 51 and 52, respectively, by bonding with an adhesive or the like or by heat fusion.

  The insulating part 50 may be formed by integrating the insulators 50a and 50b, but as shown in FIGS. 3A to 3C, the heat of the insulator 50a and the insulator 50b. It is preferable that they are bonded and integrated by melting. That is, the insulators 50a and 50b are attached to the mutually opposing surfaces of the positive electrode side terminal 51 and the pedestal 53 and the negative electrode side terminal 52 and the pedestal 54 by bonding or the like (FIG. 3A), respectively, and the insulator 50a and the insulator By heating after matching 50b, the interface between the insulator 50a and the insulator 50b is bonded by thermal melting (FIG. 3B), so that the insulating portion 50 can be obtained (FIG. 3 ( C)). When the heating temperature for thermally melting the insulators 50a and 50b is made of the preferred materials exemplified above, appropriate bonding is possible at about 100 to 400 ° C.

(Positive electrode side terminal 51, negative electrode side terminal 52)
In the assembled battery 100, the positive electrode side terminal 51 and the negative electrode side terminal 52 are provided so as to be separated from each other via the insulating part 50. The positive terminal 51 has a terminal tip 51a connected to the terminal foil 51b via a wiring (not shown) or the like provided inside or on the outer periphery of the base 53. And the terminal foil 51b and the electrical power collector 20a are connected by ultrasonic welding etc., and the positive electrode side terminal 51 and the coupling body 30 are electrically connected. On the other hand, the terminal 52a of the negative electrode side terminal 52 is connected to the terminal foil 52b via a wiring (not shown) or the like provided in the pedestal 54 or on the outer periphery. And the terminal foil 52b and the electrical power collector 20e are connected by ultrasonic welding etc., and the negative electrode side terminal 52 and the coupling body 30 are electrically connected. As the positive electrode side terminal 51 and the negative electrode side terminal 52, known positive / negative electrode terminals used in an assembled battery can be used without particular limitation.

(Pedestal 53, 54)
The pedestals 53 and 54 are members that are arbitrarily provided to fix the terminals 51 and 52. Wiring (not shown) is provided in the inside or the outer peripheral surface of the pedestals 53 and 54, and the terminal tips 51a and 52a and the terminal foils 51b and 52b are electrically connected through this. Further, when the assembled battery 100 is housed in an exterior body such as a housing or a laminate film, the pedestals 53 and 54 are fixed to the exterior body, and the portions related to the terminal tips 51a and 52b from the pedestals 53 and 54 are By projecting to the outside, the assembled battery 100 that can take out the electrical energy generated in the connector 30 to the outside can be obtained. The material of the pedestals 53 and 54 is not particularly limited, and for example, a material made of an insulating resin can be used. Further, the shape and size of the bases 53 and 54 are not particularly limited as long as the terminals 51 and 52 can be appropriately connected and fixed. For example, it can be a rectangular parallelepiped having a side of about 5 to 500 mm.

  In the assembled battery 100, as described above, a plurality of power generation units 10, 10,... Are connected through the current collectors 20, 20,. The current collector 20e serving as the other end is connected to the other via the insulating part 50. By doing in this way, by fixing with the one end and other end of the connection body 30, several electric power generation part 10,10, ... is positioned and fixed easily, and the position shift of electric power generation part 10,10, ... is suppressed. Therefore, the assembled battery 100 having excellent assemblability can be obtained. Moreover, since the terminals 51 and 52 can be gathered in one place, it can be set as the assembled battery 100 which can save space.

2. 2nd Embodiment FIGS. 4-6 is the schematic for demonstrating the assembled battery 200 of this invention which concerns on 2nd Embodiment. 4-6, about the structure similar to the assembled battery 100 which concerns on 1st Embodiment, a same sign is attached | subjected and description is abbreviate | omitted suitably. As shown in FIGS. 4 to 6, the assembled battery 200 has the same configuration as that of the assembled battery 100 except that an insulating portion 150 is provided instead of the insulating portion 50. Hereinafter, the insulating unit 150 will be described.

<Insulating part 150>
The insulating portion 150 is a portion made of an insulator. As shown in FIG. 4, the current collector 20a that is one end of the connector 30 and the current collector 20e that is the other end are connected via a terminal 51 or the like. Connected. In the assembled battery 200, the positive electrode side terminal 51 and the negative electrode side terminal 52 are provided so as to be separated from each other via an insulating part 150. The insulating portion 150 (insulators 150a and 150b) is not particularly limited as long as it can connect one end and the other end of the connecting body 30 and can be insulated. When the assembled battery 200 is an all-solid lithium secondary battery, it is preferable to have alkali resistance. In addition, after the insulators 150a and 150b are fitted, the insulators are more preferably made of an insulating material having excellent heat melting property when the insulators are bonded together by heat melting. Specifically, it is preferable that the insulating part 50 is made of the same insulating material.

  For example, as shown in FIG. 6, the insulating portion 150 is provided with a convex portion provided on the insulator 150 a in a concave portion provided on the insulator 150 b and a convex portion provided on the insulator 150 b on the insulator 150 a. It is united by fitting in the recessed part. Moreover, the insulators 150a and 150b can also be integrated more firmly by heat-melting by heating after the fitting. The size and shape of each concave portion and convex portion are not particularly limited as long as the size and shape are appropriately provided in the insulators 150a and 150b.

  Also in such an assembled battery 200, by fixing the one end and the other end of the coupling body 30, the plurality of power generation units 10, 10,... Are positioned and fixed, and positional deviation between the power generation units 10, 10,. And an assembled battery having excellent assemblability can be obtained. Moreover, since the terminals 51 and 52 can be gathered in one place, it can be set as the assembled battery 200 which can save space.

3. The assembled battery 100 and the assembled battery 200 (hereinafter, reference numerals relating to the assembled battery 200 may be indicated in parentheses) can be manufactured as follows, for example. FIG. 7 is a flowchart for explaining an assembled battery manufacturing method S10 according to an embodiment. As shown in FIG. 7, the assembled battery manufacturing method includes a power generation unit manufacturing step S <b> 1 for manufacturing the power generation unit 10, a plurality of power generation units 10, 10,. The connecting body manufacturing step S2, the positive electrode side terminal 51 and the negative electrode side terminal 52 are prepared in advance, the terminal part manufacturing step S3, the current collector 20a as one end of the connecting body 30, and the current collector as the other end. The body 20e is connected to the positive terminal 51 and the negative terminal 52, respectively, the terminal connection step S4, and the insulators 50a and 50b (150a and 150b) are attached to the positive terminal 51 and the negative terminal 52, respectively. An end connecting step S5 is provided in which 50a and 50b (150a and 150b) are integrated by heat melting and fitting to form an insulating part 50 (150).

  Step S1 is a step of producing a plurality of power generation units 10. The power generation unit 10 includes a positive electrode layer, an electrolyte layer, and a negative electrode layer, and a manufacturing method thereof is not particularly limited as long as the positive electrode current collector and the negative electrode current collector are provided. For example, a paste containing the material constituting the positive electrode layer is applied and dried by a doctor blade or the like on the positive electrode current collector, the positive electrode layer is provided, and the paste containing the material constituting the negative electrode layer is formed on the negative electrode current collector. Applying and drying by a doctor blade or the like to provide a negative electrode layer, and applying a paste containing a material constituting the electrolyte layer on the positive electrode layer or the negative electrode layer by a doctor blade or the like to provide an electrolyte layer, Each layer can be laminated so that an electrolyte layer is provided between the negative electrode layer and then subjected to press treatment or the like. Alternatively, the constituent material of the powder may be press-molded to form each layer. Alternatively, a stacked battery may be manufactured by stacking a plurality of structural units including the positive electrode layer, the solid electrolyte layer, and the negative electrode layer through a current collector, and this may be used as the power generation unit 10. Furthermore, the constituent unit including the positive electrode layer, the solid electrolyte layer, and the negative electrode layer may be wound with a current collector interposed therebetween to form a wound battery. The power generation unit 10 may be housed in an exterior body such as a laminate film.

  Step S2 is a step of connecting the produced power generation units 10, 10,... Via the current collectors 20, 20,. As described above, the current collector 20 and the power generation unit 10 may be connected by welding or the like. Alternatively, the positive electrode current collector and the negative electrode current collector of the power generation unit 10 function as the current collector 20. You may let them.

  Step S3 is a step of producing a terminal portion for connecting to the current collector 20a serving as one end of the coupling body 30 and a terminal portion for connecting to the current collector 20e serving as the other end. In step S3, the positive electrode side terminal 51 and the negative electrode side terminal 52 may be manufactured by a known manufacturing method.

  Step S4 is a step of connecting the current collector 20a serving as one end and the current collector 20e serving as the other end of the connector 30 fabricated in Step S2 to the positive electrode side terminal 51 and the negative electrode side terminal 52 fabricated in Step S3, respectively. It is. The current collectors 20a and 20e and the terminals 51 and 52 can be welded and connected by, for example, ultrasonic welding.

  In step S5, the insulators 50a and 50b (150a and 150b) are attached to the positive electrode side terminal 51 and the negative electrode side terminal 52, and the insulators 50a and 50b (150a and 150b) are integrated by thermal melting and fitting. (150). The insulator can be attached to each terminal by adhesion using an adhesive or heat fusion. In step S5, the positive terminal insulator and the negative terminal insulator thus provided may be brought into contact with each other and integrated by heat melting or fitting to form the insulating portion 50 (150). The heat melting and fitting are as described above.

  The assembled battery 100 (200) can be manufactured through the steps S1 to S5. According to the assembled battery manufacturing method S10, the plurality of power generation units 20, 20,... Are connected via the current collectors 10, 10,..., And one end and the other end of the connection body 30 are connected to the insulator 50 (150). , The assembled battery 100 (200) is manufactured, so that the plurality of power generation units 10, 10,... Can be easily positioned and fixed by fixing one end and the other end of the connection body 30. , And positional deviation between the power generation units 10, 10,... Is suppressed and can be easily assembled. Moreover, since the terminals 51 and 52 can be gathered in one place, the assembled battery 100 (200) which can save space can be manufactured.

  Although the present invention has been described with reference to the most practical and preferred embodiments at the present time, the invention is not limited to the embodiments disclosed herein. However, the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and an assembled battery and a manufacturing method of such an assembled battery are also included in the technical scope of the present invention. Must be understood as being.

  For example, in the above description of the assembled battery, the assembled battery provided with four power generation units has been described. However, the present invention is not limited to this mode, and a plurality of power generation units are connected via a current collector. Anything is acceptable.

  Further, in the above description relating to the assembled battery, the current collectors at both ends of the connection body have been described as being connected to the positive electrode side terminal and the negative electrode side terminal, respectively, but the present invention is limited to this embodiment. is not. If the one end and the other end of the coupling body are coupled via an insulating portion, the assemblability of the assembled battery can be improved. However, the positive and negative terminals can be gathered in one place, and from the viewpoint of a battery pack that can save space, the current collectors at both ends of the connected body are connected to the positive terminal and negative terminal, respectively. It is preferable to use the form.

  Further, in the above description relating to the method of manufacturing the assembled battery, it has been described that the insulating portion is formed after the end of the coupling body is connected to the positive and negative terminals, but the present invention is limited to this embodiment. is not. After connecting one end and the other end of the connection body via an insulating part, a positive electrode side terminal and a negative electrode side terminal may be provided at one end and the other end of the connection part, respectively.

  Moreover, in the said description which concerns on the manufacturing method of an assembled battery, although demonstrated as what is provided with terminal part creation process S3 and terminal connection process S4, this invention is not limited to this form. In the present invention, if the one end and the other end of the coupling body are coupled via the insulating portion, the assembly of the assembled battery can be improved, and thus the steps S3 and S4 are optional. However, it is preferable to use a manufacturing method including the steps S3 and S4 from the viewpoint that the positive and negative terminals can be gathered in one place and the assembled battery can save space.

  The assembled battery of the present invention is excellent in assemblability, space saving, safety and the like, and can be used in various industrial fields from a small power source such as a power source for mobile tools to a large power source such as an in-vehicle power source.

DESCRIPTION OF SYMBOLS 10 Electric power generation part 20 Current collector 30 Connection body 40 Insulator 50 Insulation part 51 Positive side terminal 52 Negative side terminal 53, 54 Base 55 Fitting part 100 Assembly battery 150 Insulation part 200 Assembly battery

Claims (10)

Is a coupling body-power generation part are chosen more through the current collector, and the current collector serving as the current collector and the other end of the one end in the connecting body are connected through the insulating portion An assembled battery in which a connected body connected through the insulating portion is assembled in a housing or a laminate pack .   A positive electrode side terminal and a negative electrode side terminal are provided via the insulating part, and a current collector as the one end of the coupling body is connected to the positive electrode side terminal, and a current collector as the other end is connected to the negative electrode side terminal. The assembled battery according to claim 1. The said insulating part is comprised by heat-melting the insulator attached to the said one end, and the insulator attached to the said other end, and mutually bonding, The structure of Claim 1 or 2 Battery pack. Said insulating section, an insulator attached to the one end, in which is integrated by fitting together an insulator attached to the other end, according to claim 1 Battery pack.   The insulating portion is made of polyvinylidene chloride, nylon 6, nylon 66, nylon 6/10, nylon 12, polyetherimide, polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polytetrafluoroethylene or chlorotrifluoroethylene. The assembled battery according to any one of claims 1 to 4, comprising any one or more selected. A connecting body manufacturing step of connecting a plurality of power generation units via a current collector to form a connected body, and the current collector as one end and the current collector as the other end in the connected body as an insulating portion Connecting via the end connecting step, and
A method for manufacturing an assembled battery, comprising a step of assembling a connection body obtained through the end portion connection step and connected via an insulating portion in a housing or a laminate pack .   The assembled battery according to claim 6, further comprising a terminal connection step of connecting a current collector as the one end of the coupling body to a positive electrode side terminal and connecting a current collector as the other end to a negative electrode side terminal. Manufacturing method.   The method for manufacturing an assembled battery according to claim 7, wherein an insulator is attached to the positive electrode side terminal, an insulator is attached to the negative electrode side terminal, and the insulators are bonded together by heat melting to form the insulating portion.   The method for manufacturing an assembled battery according to claim 7 or 8, wherein an insulator is attached to the positive electrode side terminal, an insulator is attached to the negative electrode side terminal, the insulators are integrated by fitting to form the insulating portion. .   The insulating portion is made of polyvinylidene chloride, nylon 6, nylon 66, nylon 6/10, nylon 12, polyetherimide, polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polytetrafluoroethylene or chlorotrifluoroethylene. The manufacturing method of the assembled battery in any one of Claims 6-9 which consists of any one or more.

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