JP7338488B2 - battery - Google Patents

Description

The present application discloses a battery.

In Patent Document 1, in a battery in which a plurality of power generation elements are electrically connected to each other, when one power generation element is short-circuited and an overcurrent flows from the other power generation element to the one power generation element, short-circuited power generation A technique is disclosed for electrically disconnecting (shutdown) a short-circuited power generation element from another power generation element by fusing a tab in the element. On the other hand, Patent Literature 2 discloses a technique of arranging a cooling member while suppressing displacement with respect to the surface of the power storage module.

JP 2017-103123 A JP 2019-175585 A

When a cooling member as disclosed in Patent Document 2 is arranged for a battery having a shutdown function as disclosed in Patent Document 1, the cooling member unnecessarily cools the shutdown tab, resulting in shutdown. It is thought that there are cases where the shutdown function by the tab is hindered.

As one means for solving the above problems, the present application provides
A battery comprising a first member, a second member, and a laminated electrode assembly,
The laminated electrode body includes a first current collector constituting one end surface in the stacking direction, a second current collector constituting the other end surface in the stacking direction, and between the first current collector and the second current collector. at least one power generation element disposed;
The first member faces one end face in the stacking direction of the stacked electrode body,
the second member faces the other end surface in the stacking direction of the stacked electrode body, faces the side surface of the stacked electrode body, or faces both the other end surface in the stacking direction and the side surface,
The first current collector has a first tab,
the first tab has a shutdown mechanism;
the second current collector has a second tab,
the second tab does not have a shutdown mechanism,
when the second member faces the side surface of the laminated electrode body, the distance between the second member and the first tab is greater than the distance between the second member and the second tab;
the second member is a cooling member,
The cooling performance of the first member is lower than the cooling performance of the second member,
Disclose the battery.

In the battery of the present disclosure, by lowering the cooling performance of the first member adjacent to the shutdown tab (first tab), the first tab is less likely to be cooled unnecessarily and the shutdown function by the first tab is less likely to be hindered.

1 is a schematic diagram showing an example of the appearance of a battery according to a first embodiment; FIG. FIG. 2 is a schematic diagram showing the configuration of the battery according to the first embodiment, taken along the line II-II in FIG. 1; FIG. 4 is a schematic diagram showing an example of the appearance of a battery according to a second embodiment; FIG. 6 is a schematic diagram showing the configuration of a tab projecting surface of a battery according to a second embodiment; 1 is a schematic diagram showing an example of the appearance of a battery stack according to a first embodiment; FIG. FIG. 2 is a schematic diagram for explaining a stacking structure of a battery stack; An exterior body is omitted and shown. FIG. 4 is a schematic diagram for explaining another example of the stacking structure of the battery stack; An exterior body is omitted and shown. FIG. 4 is a schematic diagram for explaining another example of the stacking structure of the battery stack; An exterior body is omitted and shown. FIG. 4 is a schematic diagram for explaining another example of the stacking structure of the battery stack; FIG. 2 is a schematic diagram for explaining a battery stack with heat exchangers; An exterior body is omitted and shown.

1. Battery FIGS. 1 and 2 schematically show a battery 100 according to a first embodiment. 3 and 4 schematically show a battery 200 according to a second embodiment.

1.1 First Mode As shown in FIGS. 1 and 2 , a battery 100 according to a first mode includes a first member 10 , a second member 20 and a laminated electrode assembly 30 . As shown in FIG. 2, the laminated electrode body 30 includes a first current collector 31 constituting one end surface in the stacking direction, a second current collector 32 constituting the other end surface in the stacking direction, and the first current collector 31 and at least one power generation element 34 disposed between the second current collectors 32 . As shown in FIGS. 1 and 2, the first member 10 faces one end surface of the laminated electrode body 30 in the lamination direction. Also, the second member 20 faces the other end face of the laminated electrode body 30 in the lamination direction. In the battery 100, the first current collector 31 has the first tab 31a, the first tab 31a has the shutdown mechanism, the second current collector 32 has the second tab 32a, and the second tab 32a has the second tab 32a. Tab 32a does not have a shutdown mechanism. Furthermore, in battery 100, second member 20 is a cooling member. Here, the cooling performance of the first member 10 is lower than that of the second member 20 .

1.1.1 First Member The first member 10 may be a cooling member or a non-cooling member. The first member 10 may have lower cooling performance than the second member 20, and its shape, structure and material are not particularly limited. The first member 10 may be a heat insulating member. For example, the first member 10 may be a plate-shaped heat insulating member for preventing the spread of fire. Alternatively, the first member 10 may be a resin frame for holding the laminated electrode body 30 or the exterior body 40 . In addition, in this application, such a resin frame is also regarded as a kind of heat insulating member.

As shown in FIG. 2 , an intermediate member such as an exterior body 40 may be present between the first member 10 and the first current collector 31 . Alternatively, the first member 10 may be in direct contact with the surface of the first current collector 31 .

As shown in FIG. 2, the first member 10 may be provided only on one end side of the laminated electrode body 30 in the lamination direction (position facing the surface of the first current collector 31). Alternatively, the first member 10 may have a portion protruding from a position facing the surface of the first current collector 31. For example, by bending the protruding portion, the first member 10 can be formed into a laminated electrode body. It may also exist on the lateral side of 30 .

1.1.2 Second Member The second member 20 is a cooling member. For example, the second member 20 can cool the stacked electrode assembly 30 from the second current collector 32 side. The shape, structure, and material of the second member 20 are not particularly limited. The second member 20 can be, for example, a plate-like member. Specifically, the second member 20 may be a cooling plate that removes heat from the second current collector 32 side. Alternatively, the second member 20 may be a cooling plate having channels for circulating cooling liquid. As will be described later, the second member 20 may be connected to a heat exchanger. For example, if the second member 20 has a coolant channel, the coolant channel may be connected to a heat exchanger.

As shown in FIG. 2 , an intermediate member such as an exterior body 40 may be present between the second member 20 and the second current collector 32 . Alternatively, the second member 20 may be in direct contact with the surface of the second current collector 32 .

As shown in FIG. 2, the second member 20 may be provided only on the other end side in the stacking direction of the stacked electrode body 30 (the position facing the surface of the second current collector 32). Alternatively, the second member 20 may have a portion protruding from a position facing the surface of the second current collector 32. For example, by bending the protruding portion, the second member 20 can be formed into the laminated electrode body. It may also exist on the lateral side of 30 . Alternatively, the second member 20 may exist only on the side surface of the laminated electrode body 30 as in a second embodiment described later.

The cooling performance of the first member 10 is lower than that of the second member 20 . In the battery 100 according to the first embodiment, the “cooling performance of the first member 10” is the performance of the first member 10 to cool the first current collector 31, and the “cooling performance of the second member 20” is , the ability of the second member 20 to cool the second current collector 32 . That is, "the cooling performance of the first member 10 is lower than the cooling performance of the second member 20" means that if conditions such as the thermal conductivity of the first current collector 31 are When the conditions such as conductivity are the same, the amount of heat removed from the first current collector 31 to the first member 10 per unit time is It means that it is smaller than the heat removal amount. In addition, as described above, the first member 10 does not necessarily have to be a cooling member, and may be, for example, a heat insulating member. When the first member 10 is a heat insulating member, the cooling performance of the first member 10 is naturally lower than the cooling performance of the second member 20, which is a cooling member.

In the battery of the present disclosure, the intermediate member A is present between the first member 10 and the first current collector 31, and the intermediate member B is present between the second member 20 and the second current collector 32. (A and B may be the same member or may be different members). When the intermediate member exists on the first current collector 31 side and/or the second current collector 32 side in this way, the cooling performance as a whole including the intermediate member is No. 2 current collector 32 side shall be compared. That is, the cooling performance for the first current collector 31 exhibited by the first member 10 and the intermediate member A is lower than the cooling performance for the second current collector 32 exhibited by the second member 20 and the intermediate member B. and As long as a higher cooling performance is ensured on the side of the second current collector 32 than on the side of the first current collector 31 in this manner, there is no cooling between the first member 10 and the first current collector 31 and between the second member 20 and the second member 20 . An intermediate member may be present between it and the second current collector 32 .

1.1.3 Laminated Electrode Body The laminated electrode body 30 is arranged between the first member 10 and the second member 20 . The battery 100 can be charged and discharged by the battery reaction in the laminated electrode assembly 30 . As shown in FIG. 2, the laminated electrode body 30 includes a first current collector 31 constituting one end surface in the stacking direction, a second current collector 32 constituting the other end surface in the stacking direction, and the first current collector 31 and at least one power generation element 34 disposed between the second current collectors 32 . In the laminated electrode assembly 30 shown in FIG. 2, a plurality of power generation elements 34 are connected in series via the bipolar current collectors 33, but the connection configuration of the power generation elements 34 is limited to this. It's not something you can do. Only one power generation element 34 may be arranged between the first current collector 31 and the second current collector 32 . Alternatively, a plurality of power generation elements 34 may be provided between the first current collector 31 and the second current collector 32, and the plurality of power generation elements 34 may be connected in parallel with each other.

1.1.3.1 First Current Collector The first current collector 31 constitutes one end surface of the laminated electrode body 30 in the lamination direction. In battery 100 , first current collector 31 is arranged between first member 10 and power generating element 34 . In other words, the first current collector 31 is the outermost current collector arranged on the first member 10 side in the laminated electrode body 30 .

The first current collector 31 may be made of metal foil, metal mesh, or the like. From the standpoint of excellent handleability, the first current collector 31 may be a metal foil. The first current collector 31 may consist of a plurality of sheets of metal foil. Examples of metals forming the first current collector 31 include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, and the like. The first current collector 31 may have some kind of coating layer on its surface for the purpose of adjusting the resistance. Moreover, when the first current collector 31 is composed of a plurality of metal foils, there may be some layer between the plurality of metal foils. The thickness of the first current collector 31 is not particularly limited. For example, it may be 0.1 μm or more, 1 μm or more, 1 mm or less, or 100 μm or less.

The first current collector 31 may be a positive electrode current collector or a negative electrode current collector. When the first current collector 31 is a positive electrode current collector, the second current collector 32 described later can be a negative electrode current collector. Current collector 32 can be a positive electrode current collector.

1.1.3.2 First Tab The material of the first tab 31a may be the same as that of the first current collector 31, or may be different. The thickness of the first tab 31a may be the same as the thickness of the first current collector 31, or may be different. The first tab 31 a may have any shape as long as it protrudes from the first current collector 31 . Various shapes such as a polygonal shape, a semicircular shape, and a linear shape can be adopted for the projecting shape of the first tab 31a. The method of providing the first tab 31a on the first current collector 31 is not particularly limited. For example, the first tab 31a may be formed by cutting out a portion of the first current collector 31, or the first tab 31a may be joined to the first current collector 31 by welding or the like.

The first tab 31a has a shutdown mechanism. The "shutdown mechanism" is a mechanism that cuts off current or makes it difficult for current to flow when the first tab 31a overheats or when an excessive current flows through the first tab 31a. Specific examples of the shutdown mechanism include, for example, a thermal fusion mechanism, a mechanism using a PTC element, and the like. The "thermal fusing mechanism" is a cut (or notch) provided at the base of the tab 31a, etc., and when the temperature rises or an excessive current flows, the cut (or notch) part is closed. It is called fusing. A "mechanism using a PTC element" means that a PTC material (a mixture of a resin and a conductive material, barium titanate, etc.) is placed in a part of the current path of the tab 31a, and when the temperature rises, the PTC The resistance of the material increases, making it difficult for current to flow.

1.1.3.3 Second current collector The second current collector 32 constitutes the other end surface of the laminated electrode body 30 in the lamination direction. In battery 100 , second current collector 32 is arranged between second member 20 and power generating element 34 . In other words, the second current collector 32 is the outermost current collector arranged on the second member 20 side in the laminated electrode body 30 .

The second current collector 32 may be made of metal foil, metal mesh, or the like. From the standpoint of excellent handleability, the second current collector 32 may be a metal foil. The second current collector 32 may consist of a plurality of sheets of metal foil. Examples of metals forming the second current collector 32 include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, and the like. The second current collector 32 may have some kind of coating layer on its surface for the purpose of adjusting the resistance. Moreover, when the second current collector 32 is composed of a plurality of metal foils, there may be some layer between the plurality of metal foils. The thickness of the second current collector 32 is not particularly limited. For example, it may be 0.1 μm or more, 1 μm or more, 1 mm or less, or 100 μm or less.

1.1.3.4 Second Tab The material of the second tab 32a may be the same as that of the second current collector 32, or may be different. The thickness of the second tab 32a may be the same as the thickness of the second current collector 32, or may be different. The second tab 32 a may have any shape as long as it protrudes from the second current collector 32 . Various shapes such as a polygonal shape, a semicircular shape, and a linear shape can be adopted for the shape of the second tab 32a. The method of providing the second tab 32a on the second current collector 32 is not particularly limited. For example, the second tab 32a may be formed by notching a portion of the second current collector 32, or the second tab 32a may be joined to the second current collector 32 by welding or the like.

The second tab 32a does not have a shutdown mechanism. Therefore, in the battery 100, even if the cooling performance of the second member 20 is enhanced and the amount of cooling of the second current collector 32 and the second tab 32a is enhanced, the above-described problem of impeding the shutdown function is unlikely to occur.

1.1.3.5 Bipolar Current Collector As described above, in the battery 100 , multiple power generating elements 34 may be connected in series via the bipolar current collector 33 . The presence of the bipolar current collector 33 is optional.

The bipolar current collector 33 may be made of metal foil, metal mesh, or the like. From the standpoint of excellent handleability, the bipolar current collector 33 may be made of metal foil. The bipolar current collector 33 may consist of a plurality of sheets of metal foil. Examples of metals forming the bipolar current collector 33 include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, and the like. The first current collector 31, the second current collector 32, and the bipolar current collector 33 may be made of the same or different metals. The bipolar current collector 33 may have some kind of coating layer on its surface for the purpose of adjusting the resistance. Moreover, when the bipolar current collector 33 is composed of a plurality of metal foils, there may be some layer between the plurality of metal foils. The thickness of the bipolar current collector 33 is not particularly limited. For example, it may be 0.1 μm or more, 1 μm or more, 1 mm or less, or 100 μm or less.

1.1.3.6 Power-Generating Element The power-generating element 34 may be any element that allows the battery 100 to be charged and discharged by causing a battery reaction. For example, as shown in FIG. 2, the power generation element 34 is arranged between a first active material layer 34a, a second active material layer 34b, and between the first active material layer 34a and the second active material layer 34b. and an electrolyte layer 34c.

One of the first active material layer 34a and the second active material layer 34b is a positive electrode active material layer, and the other is a negative electrode active material layer. When the first active material layer 34a is a positive electrode active material layer, the first current collector 31 can be a positive electrode current collector, and when the first active material layer 34a is a negative electrode active material layer, the first current collector The body 31 can serve as a negative electrode current collector. Further, when the second active material layer 34b is a positive electrode active material layer, the second current collector 32 can be a positive electrode current collector, and when the second active material layer 34b is a negative electrode active material layer, the second current collector 32 can be a positive electrode current collector. The current collector 32 can be the negative electrode current collector.

The positive electrode active material layer is a layer containing at least a positive electrode active material. When the battery 100 is a solid battery, in addition to the positive electrode active material, it can optionally contain a solid electrolyte, a binder, a conductive aid, and the like. Moreover, when the battery 100 is an electrolytic solution-based battery, in addition to the positive electrode active material, a binder, a conductive aid, and the like can be optionally included. A known active material may be used as the positive electrode active material. Among known active materials, two substances having different potentials (charge/discharge potentials) at which predetermined ions are occluded and released are selected. Each can be used as a negative electrode active material. For example, when constructing a lithium ion battery, various kinds of lithium cobalt oxide, lithium nickel oxide, LiNi _1/3 Co _1/3 Mn _1/3 O ₂ , lithium manganate, spinel-based lithium compounds, etc. are used as the positive electrode active material. A lithium-containing composite oxide can be used. When the battery 100 is a solid battery, the surface of the positive electrode active material may be covered with an oxide layer such as a lithium niobate layer, a lithium titanate layer, or a lithium phosphate layer. Moreover, when the battery 100 is a solid battery, the solid electrolyte is preferably an inorganic solid electrolyte. This is because the ionic conductivity is higher than that of organic polymer electrolytes. Moreover, it is because it is excellent in heat resistance compared with an organic polymer electrolyte. Further, it is harder and more rigid than the organic polymer electrolyte, and the battery 100 can be configured more easily. Preferred inorganic solid electrolytes include oxide solids such as lithium lanthanum zirconate, LiPON, Li _1+X Al _X Ge _2-X (PO ₄ ) ₃ , Li—SiO glass, Li—Al—S—O glass, and the like. Electrolyte; Li ₂ SP ₂ S ₅ , Li ₂ S—SiS ₂ , LiI—Li ₂ S—SiS ₂ , LiI—Si ₂ SP ₂ S ₅ , Li ₂ SP ₂ S ₅ —LiI—LiBr , LiI-Li ₂ SP ₂ S ₅ , LiI-Li ₂ SP ₂ O ₅ , LiI-Li ₃ PO ₄ -P ₂ S ₅ , Li ₂ SP ₂ S ₅ -GeS ₂ and other sulfides A solid electrolyte can be exemplified. In particular, a sulfide solid electrolyte is preferred, and a sulfide solid electrolyte containing Li ₂ SP ₂ S ₅ is more preferred. Examples of binders that can be contained in the positive electrode active material layer include butadiene rubber (BR) binders, butylene rubber (IIR) binders, acrylate butadiene rubber (ABR) binders, polyvinylidene fluoride (PVdF) binders, polytetrafluoro Examples include ethylene (PTFE) binders. Examples of conductive aids that can be contained in the positive electrode active material layer include carbon materials such as acetylene black and Ketjenblack, and metal materials such as nickel, aluminum, and stainless steel. The content of each component in the positive electrode active material layer may be the same as in the conventional case. The shape of the positive electrode active material layer may be the same as the conventional one. In particular, a sheet-like positive electrode active material layer is preferable from the viewpoint that the battery 100 can be easily constructed. The thickness of the positive electrode active material layer is not particularly limited. For example, it may be 0.1 μm or more and 2 mm or less. The lower limit may be 1 μm or more, and the upper limit may be 1 mm or less.

The negative electrode active material layer is a layer containing at least a negative electrode active material. When the battery 100 is a solid battery, in addition to the negative electrode active material, it can optionally contain a solid electrolyte, a binder, a conductive aid, and the like. Further, when the battery 100 is an electrolytic solution-based battery, in addition to the negative electrode active material, a binder, a conductive aid, and the like can be optionally included. A known active material may be used as the negative electrode active material. For example, when constructing a lithium ion battery, silicon-based active materials such as Si, Si alloys and silicon oxides as negative electrode active materials; carbon-based active materials such as graphite and hard carbon; various oxide-based active materials such as lithium titanate. Substance: metal lithium, lithium alloy, or the like can be used. The solid electrolyte, the binder, and the conductive aid can be appropriately selected and used from those exemplified as those used for the positive electrode active material layer. The content of each component in the negative electrode active material layer may be the same as in the conventional case. The shape of the negative electrode active material layer may also be the same as the conventional one. In particular, a sheet-like negative electrode active material layer is preferable from the viewpoint that the battery 100 can be easily constructed. The thickness of the negative electrode active material layer is not particularly limited. For example, it may be 0.1 μm or more and 2 mm or less. The lower limit may be 1 μm or more, and the upper limit may be 1 mm or less.

The electrolyte layer 34c is a layer containing at least an electrolyte. If the battery 100 is a solid state battery, the electrolyte layer 34c can be a solid electrolyte layer containing a solid electrolyte and optionally a binder. The solid electrolyte is preferably the above inorganic solid electrolyte, particularly a sulfide solid electrolyte. As the binder, the same binder as that used for the positive electrode active material layer can be appropriately selected and used. The content of each component in the solid electrolyte layer may be the same as in the conventional case. The shape of the solid electrolyte layer may also be the same as the conventional one. In particular, a sheet-like solid electrolyte layer is preferable from the viewpoint that the battery 100 can be easily constructed. In this case, the thickness of the solid electrolyte layer may be, for example, 0.1 μm or more and 2 mm or less. The lower limit may be 1 μm or more, and the upper limit may be 1 mm or less. On the other hand, when the battery 100 is an electrolyte-based battery, the electrolyte layer 34c may include an electrolyte and a separator. Known electrolytes and separators may be used. When comparing the case where the electrolyte layer 34c is a liquid electrolyte layer and the case where it is a solid electrolyte layer, the case where the electrolyte layer 34c is a solid electrolyte layer makes it easier to configure the battery 100. It is considered to be a thing.

The power generation element 34 and the laminated electrode body 30 can be produced by a known method. The number of power generation elements 34 provided in the laminated electrode body 30 is not particularly limited. For example, the number of power generation elements 34 may be 2 or more and 1000 or less. The lower limit may be 10 or more, and the upper limit may be 300 or less.

1 and 2, the laminated surface of the laminated electrode body 30 (the surface shape of the first current collector 31, etc.) is rectangular. It is not limited to this.

1.1.3.7 Other Members The battery 100 may include other members in addition to the first member 10, the second member 20, and the laminated electrode body 30 described above. For example, terminals connected to the tabs 31a and 32a may be provided. The terminals may be mechanically detachably connected to the tabs 31a and 32a, or may be joined by welding or the like.

As described above, battery 100 may include exterior body 40 for housing laminated electrode assembly 30 . In this case, the second member 20 can cool the second current collector 32 via the exterior body 40 . However, the battery can be configured without the exterior body 40 . For example, the side surface of the stacked electrode body 30 in the stacking direction may be sealed with a resin, and the sealing resin, the first current collector 31, and the second current collector 32 may exhibit the same function as the exterior body. good. In this case, the second member 20 may be brought into contact with the second current collector 32 to directly cool the second current collector 32 .

As will be described later, battery 100 may be connected to a heat exchanger. Thereby, the cooling efficiency of the second current collector 32 by the second member 20 is further improved.

As described above, according to the battery 100, the cooling performance of the first member 10 adjacent to the first current collector 31 is lower than the cooling performance of the second member 20 adjacent to the second current collector 32. , It is difficult to cool the first current collector 31 unnecessarily, it is difficult to unnecessarily transfer cold heat from the first current collector 31 to the first tab 31a, and the shutdown function of the first tab 31a provided on the first current collector 31 difficult to inhibit.

1.2 Second Mode As shown in FIGS. 3 and 4 , a battery 200 according to a second mode includes a first member 10 , a second member 20 and a laminated electrode assembly 30 . The laminated electrode body 30 is the same as that in the first embodiment. That is, the laminated electrode body 30 includes a first current collector 31 constituting one end surface in the stacking direction, a second current collector 32 constituting the other end surface in the stacking direction, the first current collector 31 and the second current collector and at least one power generation element 34 arranged between 32 (see FIG. 2). As shown in FIGS. 3 and 4, the first member 10 faces one end surface of the laminated electrode body 30 in the lamination direction. Also, the second member 20 faces the side surface of the laminated electrode body 30 . Alternatively, as described above, the second member 20 may face both the other end surface in the stacking direction and the side surface of the stacked electrode body 30 . In battery 200, first current collector 31 has first tab 31a, first tab 31a has a shutdown mechanism, second current collector 32 has second tab 32a, and second tab 32a. does not have a shutdown mechanism. Furthermore, in battery 200, the distance between second member 20 and first tab 31a is greater than the distance between second member 20 and second tab 32a. As described above, the second member 20 is the cooling member, and the cooling performance of the first member 10 is lower than that of the second member 20 . Each component is as described in the first embodiment, and the description is omitted here.

Thus, in the battery 200, the second member 20 with high cooling performance is arranged far from the first current collector 31 and the first tab 31a. Also, the cooling performance of the first member 10 adjacent to the first current collector 31 is made lower than the cooling performance of the second member 20 . According to such a battery 200, it is difficult to cool the first current collector 31 unnecessarily, cold heat is not easily transmitted unnecessarily from the first current collector 31 to the first tab 31a, and Therefore, it is difficult to inhibit the shutdown function of the first tab 31a.

2. Battery Stack The technology of the present disclosure also has an aspect as a battery stack. That is, the battery stack of the present disclosure includes a plurality of the batteries of the present disclosure. For example, a battery stack may be configured by stacking a plurality of batteries. The method of stacking the batteries is not particularly limited. The number of stacked batteries is also not particularly limited.

2.1 First Embodiment FIGS. 5 and 6A show a battery stack 1000 according to a first embodiment. As shown in FIGS. 5 and 6A, in the battery stack 1000, the second member 20 of another battery 100 may be stacked on the first member 10 of one battery 100. FIG. In other words, in the battery stack 1000, one battery 100 and another battery 100 adjacent to each other may be stacked in the same direction.

2.2 Second Embodiment FIG. 6B shows a battery stack 2000 according to a second embodiment. As shown in FIG. 6B , in the battery stack 2000, the first member 10 of one battery 100 may be stacked with the first member 10 of another battery 100 . Further, as shown in FIG. 6B , in the battery stack 2000 , the second member 20 of another battery 100 may be stacked on the second member 20 of one battery 100 . In other words, in the battery stack 2000, one battery 100 and another battery 100 adjacent to each other may be stacked in opposite directions.

2.3 Third Embodiment FIG. 6C shows a battery stack 3000 according to a third embodiment. As shown in FIG. 6C , in a battery stack 3000 , one battery 100 and another battery 100 may share the first member 10 . Further, as shown in FIG. 6C , in the battery stack 3000 , one battery 100 and another battery 100 may share the second member 20 . In other words, in the battery stack 3000, while omitting part of the first member 10 and part of the second member 20, the first member 10 and the second member 10 are provided between the adjacent one battery 100 and the other battery 100. Members 20 may be shared.

2.4 Fourth Embodiment In the above first to third embodiments, the battery stacks 1000 to 3000 including a plurality of batteries 100 are illustrated, but the battery stack of the present disclosure may include a plurality of batteries 200. That is, as shown in FIG. 7, battery stack 4000 may be a stack of a plurality of batteries 200 . In this case, as shown in FIG. 7, in the battery stack 4000, the first member 10 forming one end surface of one battery 200 is opposed to the other end surface of the other battery 200 (on the side of the second current collector 31). end face) may be laminated. In other words, in the battery stack 4000, one battery 200 and another battery 200 adjacent to each other may be stacked in the same direction.

2.5 Other Forms The second member 20 may be connected to the heat exchanger 50 like the battery stack 5000 shown in FIG. For example, when the second member 20 has a coolant flow path, the coolant flow path may be connected to the heat exchanger 50 to circulate the coolant between the heat exchanger 50 and the second member 20. can be configured to The position where the heat exchanger is connected in the battery stack is not particularly limited. Of the side surfaces (surfaces other than the stacking surface) of the batteries 100 and 200, the surface from which the tabs 31a and 32a protrude is referred to as the first side surface, the surface opposite to the first side surface as the second side surface, and the first side surface and the second side surface. When the two sides between are the third side and the fourth side, the heat exchanger 50 may be connected to the second side of the battery 100, 200, or the heat exchange may be performed on the third side or the fourth side. device 50 may be connected.

The battery stack may have arbitrary members other than the above. For example, wiring, a stack case, etc. may be provided.

As described above, according to the battery stacks 1000 to 5000 including a plurality of batteries 100 and 200 of the present disclosure, it is difficult to unnecessarily cool the first current collector 31 and the first tab 31a, and the shutdown function of the first tab 31a is inhibited. hard to do

The battery and battery stack of the present disclosure can be widely used from small power sources for mobile devices to large power sources for vehicles. In particular, it is suitable as a large-sized power source for mounting on a vehicle.

10 First member 20 Second member 30 Laminated electrode body 31 First current collector 31a First tab 32 Second current collector 32a Second tab 33 Bipolar current collector 34 Power generation element 34a First active material layer 34b Second active material Substance layer 34c Electrolyte layer 40 Exterior body 50 Heat exchanger 100 Battery 1000, 2000, 3000, 4000, 5000 Battery stack

Claims (1)

A battery comprising a first member, a second member, and a laminated electrode assembly,
The laminated electrode body includes a first current collector constituting one end surface in the stacking direction, a second current collector constituting the other end surface in the stacking direction, and between the first current collector and the second current collector. at least one power generation element disposed;
The first member faces one end face in the stacking direction of the stacked electrode body,
the second member faces the other end surface in the stacking direction of the stacked electrode body, faces the side surface of the stacked electrode body, or faces both the other end surface in the stacking direction and the side surface,
The first current collector has a first tab,
the first tab has a shutdown mechanism;
the second current collector has a second tab,
the second tab does not have a shutdown mechanism,
The shutdown mechanism is configured to cut off current flowing through the shutdown mechanism or increase the resistance of the shutdown mechanism according to the temperature of the shutdown mechanism,
when the second member faces the side surface of the laminated electrode body, the distance between the second member and the first tab is greater than the distance between the second member and the second tab;
the second member is a cooling member,
The cooling performance of the first member is lower than the cooling performance of the second member,
battery.

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