Battery pack structure and battery pack composite structure

Abstract

To provide a battery pack structure which can be improved in structure efficiency.SOLUTION: A battery pack structure having a plurality of batteries and a connection member connected to the plurality of batteries is provided. A battery comprises: a first terminal arranged in one thickness-direction surface; a second terminal arranged in the other surface; and a plurality of connection terminals arranged in a surface in which the first terminal is arranged. The connection member comprises a first terminal connection portion; a second terminal connection portion; and a connection terminal portion. The first terminal connection portion comprises a first metal layer, and the first metal layer is electrically connected to the first terminal of each battery, and the second terminal connection portion comprises a second metal layer. The second metal layer is electrically connected to a second terminal of each battery. The connection terminal connection portion comprises a plurality of terminals. Each terminal is electrically connected to each connection terminal of each battery, and the first terminal connection portion and the connection terminal connection portion are arranged in the same surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to a battery module structure and a battery module composite structure.

Background Art

[0002] Patent Document 1 discloses a bipolar battery in which connection terminals are drawn out from side surfaces.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the connection terminals are drawn out from the side surfaces, it is necessary to arrange members connected to the connection terminals on the side surfaces, and there is a problem that the size of the entire battery becomes large.

[0005] Therefore, in view of the above circumstances, a main object of the present disclosure is to provide a battery module structure capable of improving structural efficiency. Another object of the present disclosure is to provide a battery module composite structure used for the above battery module structure.

Means for Solving the Problems

[0006] The present disclosure provides at least the following aspects.

[0007] The first aspect is a battery pack structure having a plurality of batteries and a connection member connected to the plurality of batteries. The battery includes a first terminal disposed on one surface in the thickness direction, a second terminal disposed on the other surface in the thickness direction, and a plurality of connection terminals disposed on the same surface as the first terminal. The connection member includes a first terminal connection portion, a second terminal connection portion, and a connection terminal connection portion. The first terminal connection portion includes a first metal layer, and the first metal layer is electrically connected to the first terminal of each battery. The second terminal connection portion includes a second metal layer, and the second metal layer is electrically connected to the second terminal of each battery. The connection terminal connection portion includes a plurality of terminals, and each terminal is electrically connected to each connection terminal of each battery. The first terminal connection portion and the connection terminal connection portion are disposed on the same surface. This is the battery pack structure.

[0008] The second aspect is the battery pack structure according to the first aspect, wherein the connection terminal connection portion has a substrate that supports a plurality of terminals, the substrate includes a plurality of terminal wirings, and the terminal wiring is electrically connected to at least one terminal.

[0009] The third aspect is the battery pack structure according to the first aspect or the second aspect, wherein the plurality of terminals are grouped for each battery. When a group of the grouped terminals is defined as a terminal group, corresponding terminals of each terminal group are connected in parallel to one terminal wiring.

[0010] The fourth aspect is the battery pack structure according to any one of the first aspect to the third aspect, wherein the first terminal connection portion and the connection terminal connection portion are integrated.

[0011] The fifth aspect is the battery pack structure according to any one of the first aspect to the fourth aspect, wherein the first terminal connection portion, the second terminal connection portion, and the connection terminal connection portion have flexibility.

[0012] The fifth aspect is a battery pack composite structure having a plurality of battery pack structures according to any one of the first aspect to the fifth aspect and a connection member that connects the plurality of battery pack structures. The connection member includes a plurality of connection terminals, and each connection terminal is electrically connected to each terminal wiring of each battery pack structure. This is the battery pack composite structure.

Advantages of the Invention

[0013] According to the battery module structure and the battery module composite structure of the present disclosure, the structural efficiency can be improved.

Brief Description of the Drawings

[0014]

Figure 1

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Embodiments for Carrying Out the Invention

[0015] [Battery Pack Structure] The battery pack structure of the present disclosure will be described using the battery pack structure 1000 which is one embodiment.

[0016] The battery pack structure 1000 has a plurality of batteries 100 and a connecting member 500 connected to the plurality of batteries 100. A plan view of the battery pack structure 1000 is shown in FIG. 1. A cross-sectional view taken along the line II-II of FIG. 1 is shown in FIG. 2. In FIG. 1, the terminals 411a to 411h, 421a to 421h, 431a to 431h (see FIG. 11) and the batteries 100 (see FIG. 3) arranged inside the battery pack structure 1000 are shown by dotted lines.

[0017] <Battery 100> First, the battery 100 will be described. The battery 100 includes a first terminal arranged on one surface in the thickness direction, a second terminal arranged on the other surface in the thickness direction, and a plurality of connection terminals arranged on the same surface as the first terminal. Hereinafter, a form in which the first terminal is used as the positive terminal 61 and the second terminal is used as the negative terminal 62 will be described. However, the first terminal may be a negative terminal, and the second terminal may be a positive terminal. However, the first terminal and the second terminal are set to have different polarities.

[0018] Fig. 3 shows a plan view of the battery 100. Fig. 4(A) shows a cross-sectional view of the battery 100 taken along line IV-IV in Fig. 3, and Fig. 4(B) shows an exploded cross-sectional view thereof. As shown in Figs. 3, 4(A) and 4(B), the battery 100 has an electrode laminate 50 and an exterior body 90, and the electrode laminate 50 is provided inside the exterior body 90.

[0019] (Electrode laminate 50) The electrode laminate 50 will be described. Fig. 5 shows a plan view of the electrode laminate 50. Fig. 6(A) shows a front view of the electrode laminate 50 observed from the A direction in Fig. 5, and Fig. 6(B) shows a side view of the electrode laminate 50 observed from the B direction in Fig. 5.

[0020] The electrode laminate 50 has a rectangular shape when viewed in the stacking direction (thickness direction), and is a laminate including a current collector (a positive current collector and a negative current collector), a positive electrode layer, a negative electrode layer, and an electrolyte layer. In the electrode laminate 50, the number of layers stacked for each layer is not particularly limited and may be appropriately set according to the purpose. The stacking form of the electrode laminate 50 is not particularly limited, and may be a monopolar type or a bipolar type. The electrode laminate 50 may be a liquid-based battery or a solid-state battery. The electrode laminate 50 may be a lithium-ion battery, a sodium-ion battery, a nickel-metal hydride battery, or the like. The electrode laminate 50 may be a primary battery or a secondary battery.

[0021] Materials of the electrode laminate 50 Typical examples of the materials for each layer constituting the electrode laminate 50 will be described. However, the materials for each layer constituting the electrode laminate 50 are not limited thereto.

[0022] The current collector is a sheet-like conductive member. Examples of the current collector include metal foils such as stainless steel, iron, copper, aluminum, titanium, nickel, etc. The metal foil may be made of an alloy containing two or more of these metals. Further, the metal foil may be subjected to surface treatment such as predetermined plating. The current collector may be composed of a plurality of metal foils. In this case, the metal foils may be joined with an adhesive or the like, or may be joined by pressing or the like. The shape of the current collector may be rectangular. The thickness of the current collector is not particularly limited, but is, for example, 1 μm to 1 mm.

[0023] The positive electrode layer contains at least a positive electrode active material. The positive electrode active material is not particularly limited and may be appropriately selected from any materials according to the desired battery performance. For example, composite oxides, metal lithium, sulfur, etc. are mentioned. The composition of the composite oxide contains, for example, at least one of iron, manganese, titanium, nickel, cobalt, and aluminum, and lithium. Examples of the composite oxide include olivine-type lithium iron phosphate (LiFePO 4 ) etc.

[0024] The positive electrode layer may optionally contain a conductive assistant. The conductive assistant is not particularly limited and may be appropriately selected from any materials according to the desired battery performance. For example, carbon materials such as acetylene black, carbon black, and graphite are mentioned.

[0025] The positive electrode layer may optionally contain a binder. The binder is not particularly limited and may be appropriately selected from any materials according to the desired battery performance. For example, rubber-based resins, fluoride-based resins, etc. are mentioned.

[0026] The positive electrode layer may optionally contain a solid electrolyte. The solid electrolyte is not particularly limited and may be appropriately selected from any materials according to the desired battery performance. For example, oxide solid electrolytes, sulfide solid electrolytes, etc. are mentioned.

[0027] The positive electrode layer may be rectangular. The thickness of the positive electrode layer is not particularly limited and is, for example, in the range of 1 μm to 1 mm. The area of the positive electrode layer may be smaller than that of the negative electrode layer. The content of each material in the positive electrode layer is not particularly limited and may be appropriately set according to the target battery performance. Note that the positive electrode layer may contain materials other than the above-described materials.

[0028] The negative electrode layer contains a negative electrode active material. The negative electrode active material is not particularly limited and may be appropriately selected from any materials according to the target battery performance. Examples include carbon materials such as graphite, artificial graphite, hard carbon, and soft carbon, metal compounds, elements capable of alloying with lithium or their compounds, etc. Examples of elements capable of alloying with lithium include silicon and tin.

[0029] The negative electrode layer may optionally contain a conductive assistant. The conductive assistant is not particularly limited and may be appropriately selected from any materials according to the target battery performance. For example, it may be appropriately selected from the conductive assistants applicable to the positive electrode layer.

[0030] The negative electrode layer may optionally contain a binder. The binder is not particularly limited and may be appropriately selected from any materials according to the target battery performance. For example, it may be appropriately selected from the binders applicable to the positive electrode layer.

[0031] The negative electrode layer may optionally contain a solid electrolyte. The solid electrolyte is not particularly limited and may be appropriately selected from any materials according to the target battery performance. For example, it may be appropriately selected from the solid electrolytes applicable to the positive electrode layer.

[0032] The negative electrode layer may be rectangular. The thickness of the negative electrode layer is not particularly limited and is, for example, in the range of 1 μm to 1 mm. From the perspective of improving the output, the area of the negative electrode layer may be larger than that of the positive electrode layer. The content of each material in the negative electrode layer is not particularly limited and may be appropriately set according to the target battery performance. Note that the negative electrode layer may contain materials other than the above-described materials.

[0033] When the electrolyte layer is a liquid electrolyte layer, the electrolyte layer includes a separator and an electrolytic solution. The separator is mainly a porous sheet made of polyolefin. The electrolytic solution is a non-aqueous solvent in which a supporting salt is dissolved. Examples of the non-aqueous solvent include carbonates, ethers, esters, etc. The supporting salt is, for example, LiPF 6 , LiBF 4 , lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethane)sulfonimide (LiTFSI), etc.

[0034] When the electrolyte layer is a solid electrolyte layer, the electrolyte layer includes a solid electrolyte. Further, the solid electrolyte layer may include a binder. The solid electrolyte and the binder may be appropriately selected from the above-described solid electrolytes and binders.

[0035] The electrolyte layer may be rectangular. The thickness of the electrolyte layer is not particularly limited and is, for example, in the range of 1 μm to 1 mm.

[0036] End face positive electrode current collector 11, end face negative electrode current collector 12, internal current collector 20 As described in FIGS. 5, 6(A), and 6(B), the electrode laminate 50 includes a positive electrode current collector disposed on one surface in the stacking direction (thickness direction) (which may be referred to as "end face positive electrode current collector 11" in this specification), and a negative electrode current collector disposed on the other surface in the stacking direction (which may be referred to as "end face negative electrode current collector 12" in this specification). Further, the electrode laminate 50 includes a current collector (which may be referred to as "internal current collector 20" in this specification) inside thereof. In FIG. 5(B), since the layers other than the end face positive electrode current collector 11, the end face negative electrode current collector 12, and the internal current collector 20 vary depending on the target battery, they are not specifically illustrated.

[0037] The number of the internal current collectors 20 is not particularly limited and may be appropriately set according to the purpose. In FIGS. 5, 6(A), and 6(B), a plurality of internal current collectors 20 (a total of eight) are arranged inside the electrode laminate 50. The internal current collector 20 may be a positive electrode current collector or a negative electrode current collector. Also, the internal current collectors 20 may be of the same type or different types. However, since the internal electrode 40 has a role of providing battery information to the outside as described later, it may be composed of all the same type of current collectors (preferably positive electrode current collectors). Further, the electrode laminate 50 may include a normal current collector other than the internal current collector 20 inside thereof.

[0038] One feature of the internal current collector 20 is that, unlike other current collectors, it includes a connection portion 22 drawn out from the side surface of the electrode laminate 50. FIG. 7(A) shows a plan view of the internal current collector 20, and FIG. 7(B) shows a plurality of internal current collectors 20 for explaining the difference in the position of the connection portion 22.

[0039] As shown in FIG. 7(A), the internal current collector 20 includes a main body portion 21 and a connection portion 22. The main body portion 21 is a portion laminated inside the electrode laminate 50 and functions as a current collector. Therefore, a positive electrode layer or a negative electrode layer is laminated on the main body portion 21. The main body portion 21 has a rectangular shape. On the other hand, the connection portion 22 is a portion for providing battery information (information such as voltage and current) to the outside and has an elongated strip shape. The connection portion 22 is used, for example, as a voltage monitoring line. As shown in FIGS. 5, 6(A), and 6(B), the connection portion 22 has a form drawn out from the side surface 50a of the electrode laminate 50, and the drawn-out connection portion 22 is bent in the stacking direction. Then, the end portion of the connection portion 22 is further bent and arranged on the same surface as the end surface positive electrode current collector 11. Thus, the connection portion 22 is characterized in that it extends from the side surface 50a of the electrode laminate 50 in the stacking direction and is arranged on the same surface as the end surface positive electrode current collector 11.

[0040] In a conventional battery, a connection portion that functions as a voltage monitoring line had a form in which it was drawn out in the side direction. In contrast, in the electrode laminate 50, the connection portion 22 has a portion that extends in the stacking direction on the side surface of the electrode laminate 50, whereby the area occupied by the connection portion 22 in the entire battery 100 can be reduced. Therefore, the electrode laminate 50 can improve structural efficiency.

[0041] Here, among the connection portion 22, a portion that is drawn out from the side surface of the electrode laminate 50 and extends in the stacking direction of the side surface 50a is defined as an extension portion 23, and a portion that is arranged on the same surface as the end face positive electrode current collector 11 is defined as an end portion 24.

[0042] As shown in FIG. 7(B), the position of the connection portion 22 in the internal current collector 20 is not particularly limited. However, as shown in FIGS. 5 and 6(A)(B), each connection portion 22 drawn out from a plurality of internal current collectors 20 may be arranged at positions that do not overlap each other when viewed in the stacking direction. Thereby, contact between the connection portions 22 can be suppressed, and the battery structure can be simplified. Further, as shown in FIG. 7(B), the length of the connection portion 22 may be arbitrarily set according to the position of the end portion 24.

[0043] Here, a further explanation will be given regarding "the connection portion 22 is arranged on the same surface as the end face positive electrode current collector 11". As shown in FIGS. 5 and 6(A)(B), the end portion 24 of the connection portion 22 is arranged on the end face positive electrode current collector 11 via the end face insulating layer 30. For this reason, strictly speaking, it cannot be said that the end portion 24 of the connection portion 22 is arranged on the same surface as the end face positive electrode current collector 11. However, since the end face insulating layer 30 is a very thin layer, from the perspective of use, it can be said that they are arranged on the same surface. Therefore, "the connection portion 22 is arranged on the same surface as the end face positive electrode current collector 11" does not strictly mean that the end portion 24 of the connection portion 22 is arranged on the same surface as the end face positive electrode current collector 11, but means that from the perspective of use, the end portion 24 of the connection portion 22 may be arranged on the same surface as the end face positive electrode current collector 11.

[0044] Note that, in the electrode laminate 50, the connection portion 22 is disposed on the same surface as the end face positive electrode current collector 11, but is not limited thereto. The connection portion 22 may be disposed on the same surface as the end face negative electrode current collector 12.

[0045] Therefore, in the electrode laminate 50, the first end face current collector is disposed on one surface in the stacking direction, the second end face current collector is disposed on the other surface in the stacking direction, the internal current collector 20 is stacked inside the electrode laminate 50, the internal current collector 20 has a connection portion 22 drawn out from the side surface 50a of the electrode laminate 50, and the connection portion 22 may extend in the stacking direction along the side surface 50a of the electrode laminate 50 and be disposed on the same surface as the first end face current collector. Here, when the first end face current collector is the end face positive electrode current collector 11, the second end face current collector is the end face negative electrode current collector 12. When the first end face current collector is the end face negative electrode current collector 12, the second end face current collector is the end face positive electrode current collector 11.

[0046] End face insulating layer 30 The electrode laminate 50 has an end face insulating layer 30. The end face insulating layer 30 is disposed on a part of the end face positive electrode current collector 11. And the connection portion 22 (end portion 24) is disposed on the end face positive electrode current collector 11 via the end face insulating layer 30, and the end portion 24 and the end face positive electrode current collector 11 are insulated by the end face insulating layer 30. Thus, the end face insulating layer 30 is disposed between the end portion 24 and the end face positive electrode current collector 11 and has the role of insulating them.

[0047] The material of the end face insulating layer 30 is not particularly limited, and examples thereof include polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, etc. The thickness of the end face insulating layer 30 is not particularly limited, and is, for example, 5 μm to 300 μm. The arrangement method of the end face insulating layer 30 is not particularly limited, and for example, a resin tape may be attached to the end face positive electrode current collector 11. Also, a resin sheet may be disposed between the end face positive electrode current collector 11 and the end portion 24 of the connection portion 22. Alternatively, a resin material may be applied to the end face positive electrode current collector 11.

[0048] Note that the end face insulating layer 30 may be disposed at the end portion 24. Even if the end face insulating layer 30 is disposed at the end portion 244, the end face insulating layer 30 can insulate the end portion 24 and the end face positive electrode current collector 11. Therefore, the end face insulating layer 30 may be disposed between the end portion 24 and the end face positive electrode current collector 11.

[0049] Side insulating layer 40 The electrode laminate 50 has a side face insulating layer 40. The side face insulating layer 40 is disposed on the side face 50a of the electrode laminate 50. And, the connection portion 22 (extension portion 23) and the side face 50a of the electrode laminate 50 are insulated by the side face insulating layer 40. Thus, the side face insulating layer 40 is disposed on the side face 50a and has the role of insulating the extension portion 23 and the side face 50a. Therefore, the side face insulating layer 40 may be disposed on at least a part of the side face 50a. The side face insulating layer 40 may be disposed on the entire side face 50a.

[0050] The material of the side face insulating layer 40 is not particularly limited, and examples thereof include polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, etc. The thickness of the side face insulating layer 40 is not particularly limited, and is, for example, 5 μm to 300 μm. The method of disposing the side face insulating layer 40 is not particularly limited, and for example, a resin tape may be attached to the side face 50a of the electrode laminate 50. Also, a resin sheet may be disposed between the side face 50a of the electrode laminate 50 and the extension portion 23 of the connection portion 22. Alternatively, a resin material may be applied to the side face 50a of the electrode laminate 50.

[0051] Note that the side face insulating layer 40 may be disposed at the extension portion 23. Even if the side face insulating layer 40 is disposed at the extension portion 23, the side face insulating layer 40 can insulate the extension portion 23 and the side face 50a of the electrode laminate 50. Therefore, the side face insulating layer 40 may be disposed on at least one of the extension portion 23 and the side face 50a of the electrode laminate 50.

[0052] (Laminated form of the electrode laminate 50) As described above, the electrode laminate 50 is a laminate including a current collector, a positive electrode layer, an electrolyte layer, and a negative electrode layer. End face current collectors 11 and 12 are laminated on both surfaces of the electrode laminate 50 in the lamination direction, and a plurality of internal current collectors 20 are provided inside thereof. Other configurations are not particularly limited. A cross-sectional view of the electrode laminate 50, which is an example, is shown in FIG. 6. The electrode laminate 50 shown in FIG. 8 is an electrode laminate for a bipolar lithium ion secondary battery.

[0053] As shown in FIG. 8, the electrode laminate 50 is formed by laminating a plurality of electrode bodies 56. In the electrode laminate 50, the number of electrode bodies 56 is not particularly limited and may be appropriately set according to the purpose.

[0054] The electrode body 56 includes a positive electrode current collector 51, a negative electrode current collector 52, a positive electrode layer 53, a negative electrode layer 54, and an electrolyte layer 55. The electrode body 56 is formed by laminating the negative electrode layer 54 disposed on the upper surface of the negative electrode current collector 52 and the positive electrode layer 53 disposed on the lower surface of the positive electrode current collector 51 with the electrolyte layer 55 interposed therebetween. And the electrode laminate 50 is formed by laminating a plurality of electrode bodies 56 so that they are connected in series.

[0055] Here, the positive electrode current collector 51 disposed on one surface of the electrode laminate 50 in the lamination direction corresponds to the end face positive electrode current collector 11, and the negative electrode current collector 52 disposed on the other surface in the lamination direction corresponds to the end face negative electrode current collector 12. Also, the positive electrode current collector 51 or the negative electrode current collector 52 included inside the electrode laminate 50 corresponds to the internal current collector 20. In FIG. 8, the positive electrode current collector 51 included inside the electrode laminate 50 is used as the internal current collector 20.

[0056] (Outer package 90) The outer package 90 is made of metal. As shown in FIGS. 3, 4(A)(B), it has a rectangular shape when viewed in the thickness direction. The outer package 90 is a box-shaped member having a space capable of accommodating the electrode laminate 50 inside.

[0057] Basic structure of the exterior body 90 First, the basic structure of the outer package 90 will be described. The outer package 90 has a positive electrode outer package 91 and a negative electrode outer package 92. Further, the outer package 90 has insulating resins 93 and 94.

[0058] The positive electrode outer package 91 is made of metal and has a box shape having a rectangular bottom plate 91a and four side plates 91b that share each side of the bottom plate 91a. That is, the positive electrode outer package 91 has a U-shaped cross section. Also, the surface of the positive electrode outer package 91 facing the bottom plate 91a is open. The negative electrode outer package 92 is made of metal and has a box shape having a rectangular bottom plate 92a and four side plates 92b that share each side of the bottom plate 92a. That is, the negative electrode outer package 92 has a U-shaped cross section. Also, the surface of the negative electrode outer package 92 facing the bottom plate 92a is open. Then, the positive electrode outer package 91 and the negative electrode outer package 92 are overlapped such that their bottom plates face each other in the stacking direction and their side plates face each other in a direction perpendicular to the stacking direction. Thereby, a space capable of accommodating the electrode laminate 50 can be formed inside the outer package 90.

[0059] Here, the bottom plate 91a of the positive electrode outer package 91 is formed to have a larger area than the bottom plate 92a of the negative electrode outer package 92. Therefore, when the electrode laminate 50 is accommodated in the outer package 90, the side plates 92b of the negative electrode outer package 92 are disposed inside the side plates 91b of the positive electrode outer package 91.

[0060] The metal constituting the positive electrode outer package 91 and the negative electrode outer package 92 is not particularly limited, and examples thereof include aluminum, aluminum alloy, stainless steel, copper, copper alloy, and nickel steel. The thicknesses of the positive electrode outer package 91 and the negative electrode outer package 92 are not particularly limited, and are, for example, 0.05 mm or more and 2.0 mm or less.

[0061] The resin 93 is disposed between the side surface of the electrode laminate 50 and the side plate 92b of the positive electrode exterior body 91. Thereby, the side surface of the electrode laminate 50 and the side plate 92b of the positive electrode exterior body 91 are insulated from each other and can be fixed. The resin 94 is disposed between the side plate 91b of the positive electrode exterior body 91 and the side plate 92b of the negative electrode exterior body 92. Thereby, the side plate 91b of the positive electrode exterior body 91 and the side plate 92b of the negative electrode exterior body 92 are insulated from each other and can be fixed.

[0062] Such a basic configuration of the outer layer body 90 is described in, for example, Japanese Patent Application No. 2023-006850.

[0063] Characteristic structure of the exterior body 90 Subsequently, the characteristic parts of the exterior body 90 will be described. The exterior body 90 includes a positive electrode terminal 61 disposed on one surface in the thickness direction, a negative electrode terminal 62 disposed on the other surface in the thickness direction, and a plurality of connection terminals 70 (70a to 70h) disposed on the same surface as the positive electrode terminal 61.

[0064] The positive electrode terminal 61 is the bottom plate 91a of the positive electrode exterior body 91 and is the part exposed to the outside. Typically, an insulating layer may be disposed on a part of the inner surface of the bottom plate 91a of the positive electrode exterior body 91 other than the part in contact with the end face positive electrode current collector 11, and an insulating layer 95 may be disposed on a part of the outer surface other than the part connected to the outside (see FIG. 3, not shown in FIG. 4). In this case, the positive electrode terminal 61 is the part of the bottom plate 91a of the positive electrode exterior body 91 where no insulating layer is disposed and is exposed to the outside. The same applies to the negative electrode terminal 62. The negative electrode terminal 62 is the bottom plate 92a of the negative electrode exterior body 92 and is the part exposed to the outside. Typically, an insulating layer may be disposed on a part of the inner surface of the bottom plate 92a of the negative electrode exterior body 92 other than the part in contact with the end face negative electrode current collector 12, and an insulating layer may be disposed on a part of the outer surface other than the part connected to the outside. In this case, the negative electrode terminal 62 is the part of the bottom plate 92a of the negative electrode exterior body 92 where no insulating layer is disposed and is exposed to the outside.

[0065] Note that both surfaces of the side plate 91b of the positive electrode exterior body 91 and the side plate 92b of the negative electrode exterior body 92 may be covered with an insulating layer. Thereby, the inner surface of the side plate of the exterior body 90 (the inner surface of the side plate 92b of the negative electrode exterior body 92) and the electrode laminate 50 can be insulated. Also, the outer surface of the side plate of the exterior body 90 (the outer surface of the side plate 91b of the positive electrode exterior body 91) and an external member can be insulated.

[0066] Here, the positive electrode terminal 61 is in direct contact with and electrically connected to the end face positive electrode current collector 11 of the electrode laminate 50 inside the exterior body 90. The negative electrode terminal 62 is in direct contact with and electrically connected to the end face negative electrode current collector 12 of the electrode laminate 50 inside the exterior body 90. Therefore, both end faces in the stacking direction of the exterior body 90 function as terminals. In this way, since the positive electrode terminal 61 and the negative electrode terminal 62 are electrically connected to the end face positive electrode current collector 11 and the end face negative electrode current collector 12 of the electrode laminate 50 inside the exterior body 90, airtightness and gas barrier properties are ensured.

[0067] Note that from the viewpoint of improving structural efficiency, the positive electrode terminal 61 and the end face positive electrode current collector 11 are in direct contact and electrically connected inside the exterior body 90, but it is not limited to this form. The positive electrode terminal 61 and the end face positive electrode current collector 11 may be indirectly electrically connected inside the exterior body 90 via a conductive member or the like. The same applies to the negative electrode terminal 62.

[0068] The connection terminal 70 is electrically connected to the connection portion 22 (end portion 24) of the electrode laminate 50 and has a role of providing information on the electrode laminate 50 to the outside. The connection terminal 70 is disposed on the bottom plate 91a of the positive electrode exterior body 91. That is, the connection terminal 70 is disposed on the same surface as the positive electrode terminal 61. The connection terminal 70 is in direct contact with and electrically connected to the end portion 24 of the connection portion 22 inside the exterior body 90. The number of connection terminals 70 corresponds to the number of connection portions 22, and each connection terminal 70 is connected to each connection portion 22.

[0069] The specific configuration of the connection terminal 70 will be described. A partial cross-sectional view focusing on the connection terminal 70 is shown in FIG. 9. As shown in FIG. 9, the connection terminal 70 has a through-hole 71 that penetrates the end face of the exterior body 90 (the bottom plate 91a of the positive electrode exterior body 91) in the stacking direction, a metal part 72 disposed in the through-hole 71, and an insulating layer 73 disposed between the through-hole 71 and the metal part 72.

[0070] The through-hole 71 penetrates the end face of the exterior body 90 (the bottom plate 91a of the positive electrode exterior body 91) in the stacking direction. The size of the through-hole 71 is not particularly limited and may be appropriately set according to the purpose. For example, the size of the through-hole 71 may be 0.05 mm to 1.0 mm. The shape of the through-hole 71 is not particularly limited, but is typically circular.

[0071] The metal part 72 is a part that directly contacts and is electrically connected to the end 24 of the connection part 22 inside the exterior body 90. By connecting the metal part 72 to the end 24 of the connection part 22 inside the exterior body 90, airtightness and gas barrier properties are ensured. The metal constituting the metal part 72 is not particularly limited. For example, copper, gold, silver, nickel, chromium, etc. may be mentioned. The metal part 72 may be disposed only in the through-hole 71, but from the viewpoint of enhancing connectivity, in addition to the inside of the through-hole 71, it may also be disposed in the peripheral part of the inner surface and the peripheral part of the outer surface of the exterior body 90 (the bottom plate 91a of the positive electrode exterior body 91) continuous from the through-hole 71.

[0072] From the viewpoint of improving structural efficiency, the metal part 72 and the end 24 of the connection part 22 are in direct contact and electrically connected inside the exterior body 90, but it is not limited to this form. The metal part 72 and the end 24 of the connection part 22 may be indirectly electrically connected via a conductive member or the like inside the exterior body 90.

[0073] The insulating layer 73 serves to insulate the metal part 72 from the exterior body 90 (the positive electrode exterior body 91). The insulating layer 73 is disposed between the exterior body 90 (the positive electrode exterior body 91) and the metal part 72. When the metal part 72 is disposed only inside the through-hole 71, the insulating layer 73 may be provided only on the inner part of the through-hole 71. When the metal part 72 is disposed inside the through-hole 71 as well as in the peripheral parts of the inner surface and the outer surface of the exterior body 90 (the bottom plate 91a of the positive electrode exterior body 91) continuous with the through-hole 71, the insulating layer 73 may be disposed on the inner part of the through-hole 73 as well as in the inner and outer peripheral parts of the exterior body 90 continuous with the through-hole 71. Typically, as described above, on the bottom plate 91a of the positive electrode exterior body 91, the insulating layer 95 is disposed on parts other than the positive electrode terminal 61. Therefore, typically, the insulating layer 73 forms part of the insulating layer 95 and is disposed on the inner part of the through-hole 73 as well as in the inner and outer peripheral parts of the exterior body 90 continuous with the through-hole 71.

[0074] The material of the insulating layer 73 is not particularly limited, and examples thereof include polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, and the like.

[0075] The method of providing the connection terminal 70 to the exterior body 90 is not particularly limited, and examples thereof include the following method. FIG. 10 shows an example of the method of providing the connection terminal 70 to the exterior body 90. FIG. 10 is a cross-sectional view of the positive electrode exterior body 91. First, a through-hole 71 is provided at a predetermined position on the bottom plate 91a of the positive electrode exterior body 91. Subsequently, the part of the bottom plate 91a that will become the positive electrode terminal 61 is covered with a predetermined masking member M, and an insulating layer is disposed on the other parts. Then, the metal part 72 is disposed in the through-hole 71 provided with the insulating layer 72. Examples of the method of disposing the metal part 72 include plating.

[0076] In the battery 100, inside the exterior body 90, the end-face positive electrode current collector 11 and the positive electrode terminal 61 are electrically connected, the end-face negative electrode current collector 12 and the negative electrode terminal 62 are electrically connected, and the connection part 22 and the connection terminal 70 are electrically connected. Therefore, the battery 100 has improved airtightness and gas barrier properties. Also, in the battery 100, the end-face electrode terminal and the connection terminal are arranged on the same plane. Therefore, the battery 100 has improved structural efficiency for the same reason as the electrode laminate 50.

[0077] <Connection member 500> Next, the connection member 500 will be described. The connection member 500 includes a first terminal connection part, a second terminal connection part, and a connection terminal connection part 400. Hereinafter, a form in which the first terminal connection part is used as the positive electrode terminal connection part 200 and the second terminal connection part is used as the negative electrode terminal connection part 300 will be described. However, the first terminal connection part may be the negative electrode terminal connection part, and the second terminal connection part may be the positive electrode terminal connection part. However, the first terminal connection part and the second terminal connection part are each set to be connected to different polarities.

[0078] As shown in FIGS. 1 and 2, the connection member 500 includes a positive electrode terminal connection part 200, a negative electrode terminal connection part 300, and a connection terminal connection part 400. In the assembled battery structure 1000, the positive electrode terminal connection part 200 and the connection terminal connection part 400 are integrated.

[0079] FIG. 11 shows a bottom view of the positive electrode terminal connection part 200 and the connection terminal connection part 400. FIG. 11 shows a plan view of the negative electrode terminal connection part 300.

[0080] (Positive electrode terminal connection part 200, negative connection terminal 300) The positive electrode terminal connection part 200 is a sheet-like member. As shown in FIGS. 2 and 11, the positive electrode terminal connection part 200 includes a first metal layer 210, and the first metal layer 210 is in direct contact with and electrically connected to the positive electrode terminal 61 of each battery 100. The positive electrode terminal connection part 200 includes a first base material layer 220 that supports the first metal layer 210. The positive electrode terminal connection part 200 has a first insulating layer 230 around the portion that contacts the positive electrode terminal 61 on the surface opposite to the first base material layer 220 of the first metal layer 210.

[0081] Further, the positive electrode terminal connection portion 200 includes a first positioning portion 240 for guiding the installation position of the battery 100. The first positioning portion 240 is made of resin and is formed to protrude on the first insulating layer 230. The first positioning portion 240 is configured to surround at least a part of the periphery of each positive electrode terminal 61. In FIG. 11, the first positioning portion 240 is formed to surround each positive electrode terminal 61 in a U-shape in plan view. By providing the first positioning portion 240, the battery 100 can be installed at an appropriate position, and the contact between the first metal layer 210 and the positive electrode terminal 61 and the contact between each terminal of the connection terminal connection portion 300 and each connection terminal 70 can be ensured.

[0082] The structure of the negative electrode terminal connection portion 300 is the same. That is, the negative electrode terminal connection portion 300 is a sheet-like member. The negative electrode terminal connection portion 300 includes a second metal layer 310, and the second metal layer 310 is in direct contact with and electrically connected to the negative electrode terminal 62 of each battery 100. The negative electrode terminal connection portion 300 includes a second base material layer 320 that supports the second metal layer 310. The negative electrode terminal connection portion 300 is provided with a second insulating layer 330 around the portion that contacts the negative electrode terminal 62 on the surface opposite to the second base material layer 320 of the second metal layer 310.

[0083] Further, the negative electrode terminal connection portion 300 includes a second positioning portion 340 for guiding the installation position of the battery 100. The second positioning portion 340 is made of resin and is formed on the second insulating layer 330. The second positioning portion 340 is configured to surround at least a part of the periphery of each negative electrode terminal 62. In FIG. 12, the second positioning portion 340 is formed to surround each negative electrode terminal 62 in a U-shape in plan view. By providing the second positioning portion 340, the battery 100 can be installed at an appropriate position, and the contact between the second metal layer 310 and the negative electrode terminal 62 can be ensured.

[0084] The metals constituting the first metal layer 210 and the second metal layer 310 are not particularly limited, and examples thereof include gold, silver, copper, aluminum, nickel, iron, and alloys containing these metals. The first base material layer 220, the second base material layer 320, the first insulating layer 230, the second insulating layer 330, the first positioning portion 240, and the second positioning portion 340 are made of resin. Examples of the resin include polyethylene terephthalate, nylon, polymethyl methacrylate, polypropylene, polycarbonate, polyalkylene terephthalate, polyimide, epoxy resin, and the like.

[0085] The sizes of the positive electrode terminal connection portion 200 and the negative electrode terminal connection portion 300 are not limited as long as they can sandwich the battery 100. Since it is not necessary to make them extremely large compared to the battery 100, for example, the size can be set to the position from the end of the battery 100 to 0.1 to 5.0 mm. When terminals are provided at the ends of the positive electrode terminal connection portion 200 and the negative electrode terminal connection portion 300, the length in the longitudinal direction may be increased as necessary.

[0086] The thicknesses of the positive electrode terminal connection portion 200 (excluding the first positioning portion 240) and the negative electrode terminal connection portion 300 (excluding the second positioning portion 240) may be appropriately set in consideration of the required degree of flexibility and the balance of strength. For example, it may be 0.005 mm to 1 mm.

[0087] As a method of bringing the battery 100 into contact with the positive electrode terminal connection portion 200 and the negative electrode terminal connection portion 300, a shrink film, a restraint band, an adhesive, ultrasonic welding, laser welding, electric welding, etc. may be used. Or, it may be fixed by sandwiching from the outside in the thickness direction with a plate or the like. Alternatively, it may be brought into contact using a spring or the like.

[0088] As described above, the positive electrode terminal 61 of each battery 100 is electrically connected to the positive electrode terminal connection portion 200 (the first metal layer 210), and the negative electrode terminal 62 of each battery 100 is electrically connected to the negative electrode terminal connection portion 300 (the second metal layer 310). Thereby, each battery 100 is connected in parallel.

[0089] Regarding the structures of the positive electrode terminal connection portion 200 and the negative electrode terminal connection portion 300, reference may be made to Japanese Patent Application No. 2023-065874.

[0090] <Connection terminal connection portion 400> The connection terminal connection portion 400 is a sheet-like member, includes a plurality of terminals, and each connection element is electrically connected to each connection terminal 70a to 70h of each battery 100. The plurality of terminals are divided for each battery 100 to be connected, and the divided group of terminals are referred to as terminal groups 410 to 430. The terminal group 410 includes terminals 411a to 411h, the terminal group 420 includes terminals 421a to 421h, and the terminal group 430 includes terminals 431a to 431h. Further, the connection terminal connection portion 400 has a substrate 450 that supports the plurality of terminals, and the substrate 450 includes a plurality of terminal wirings 440a to 440h inside. Furthermore, the connection terminal connection portion 400 includes a connector convex portion 460 for collecting the terminal wirings 440a to 440h and connecting them to the outside.

[0091] Fig. 13 shows a cross-sectional view focusing on the terminal group 410. Fig. 13(A) shows a cross-section where the terminal 411a and the terminal wiring 412a are connected. Fig. 13(B) shows a cross-section where the terminal 411b and the terminal wiring 412b are connected.

[0092] As can be understood from Fig. 13(A) and (B), each of the terminals 411a to 411h is in contact with each of the terminal wirings 440a to 440h in a one-to-one relationship and is electrically connected. The reason why such a structure is possible is that the connection terminal connection portion 400 has a two-layer structure composed of the substrate 450 and the plurality of terminals. Also, since each of the terminals 411a to 411h is connected to each of the connection terminals 70a to 70h of the battery 100, battery information (information such as voltage and current) of the electrode laminate 50 can be obtained from the terminal wirings 440a to 440h.

[0093] Similarly, the terminal groups 420 and 430 are also connected to the connection terminals 70a to 70h of each battery 100. On the other hand, the terminal groups 420 and 430 are connected to the terminal wiring 440a to 440h similar to the terminal group 410. That is, the terminal wiring 440a to 440h is shared by the terminal groups 410 to 430, and the terminal groups 410 to 430 are connected in parallel. More specifically, the terminal wiring 412a is connected to the terminals 411a, 421a, and 431a. The terminal wiring 412b is connected to the terminals 411b, 421b, and 431b. The same applies to the terminal wiring 440c to 440h. In this way, the corresponding terminals of each terminal group 410 to 430 are connected in parallel to one terminal wiring. Thereby, the number of terminal wirings can be reduced and the structure can be simplified.

[0094] However, the assembled battery structure 1000 is not limited to this aspect. That is, the terminal wiring does not have to be connected in parallel as described above, and it may be in a form where only one terminal is connected to one terminal wiring. Thereby, battery information can be obtained from each individual terminal. Therefore, the terminal wiring only needs to be electrically connected to at least one terminal.

[0095] (Structural features of the positive terminal connection portion 200 and the connection terminal connection portion 400) The positive terminal connection portion 200 and the connection terminal connection portion 400 are installed on the surface where the positive terminal 61 and the connection terminal 70 of the battery 100 are arranged. That is, the positive terminal connection portion 200 and the connection terminal connection portion 400 are arranged on the same surface. Conventionally, like the bipolar battery described in Patent Document 1, the connection terminal for providing battery information is drawn out from the side surface of the battery, and the connection terminal connection portion is arranged on the side surface. In contrast, in the assembled battery structure 1000, the positive terminal connection portion 200 and the connection terminal connection portion 400 are arranged on the same surface. Thereby, the expansion in the side surface direction is suppressed. Therefore, according to the assembled battery 1000, the structural efficiency can be improved.

[0096] In addition, in the assembled battery structure 1000, for the battery 100 having the connection terminal 70 disposed on the same surface as the positive electrode terminal 61, the connection terminal connection portion 400 disposed on the same surface as the positive electrode terminal connection portion 200 is arranged. Therefore, simply by installing the positive electrode terminal connection portion 200 and the connection terminal connection portion 400 on the battery 100, these members are electrically connected. Accordingly, the assembled battery structure 1000 does not require a complicated connection operation, which also contributes to reducing the manufacturing cost.

[0097] In addition, the positive electrode terminal connection portion 200 and the connection terminal connection portion 400 are integrated. Thereby, handling becomes easy. However, the positive electrode terminal connection portion 200 and the connection terminal connection portion 400 may be separate members.

[0098] (Flexibility of the connection member 500) The positive electrode terminal connection portion 200, the negative electrode terminal connection portion 300, and the connection terminal connection portion 400 are all sheet-like members and have flexibility (flexibility). In particular, in the positive electrode terminal connection portion 200, the negative electrode terminal connection portion 300, and the connection terminal connection portion 400, the portion between the batteries 100 adjacent in the longitudinal direction has flexibility. Thereby, the assembled battery structure 1000 can have various forms not only in the form where the batteries 100 are arranged in a plane. For example, as shown in FIG. 14, a form in which the batteries 100 are stacked in a zigzag manner is also possible. In this case, the assembled battery structure may be constrained using a constraining member such as a metal band, and each terminal may be brought into contact with a metal layer.

[0099] (Another form regarding positioning) A connection member having another form regarding the positioning of the battery 100 will be described. The other form can guide the installation position of the battery 100 by a notch. FIG. 15 shows a bottom view of the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400 which are other forms. FIG. 16 shows a plan view of the negative electrode terminal connection portion 1300 which is another form. In FIG. 16, each battery 100 arranged for reference is shown by a dotted line.

[0100] As shown in FIG. 15, the positive electrode terminal connection portion 1200 has substantially the same configuration as the positive electrode terminal connection portion 200, but is different in that it includes a first notch 1240 instead of the first positioning portion 240. The connection terminal connection portion 1400 includes a third notch 1470 in addition to the configuration of the connection terminal connection portion 400. The first notch 1240 is a portion (first connection portion) between the batteries 100 adjacent in the longitudinal direction in the positive electrode terminal connection portion 1200, and is formed at an end on the side opposite to the connection terminal connection portion 1400 in the short hand direction. The third notch 1470 is formed at a position corresponding to the first connection portion in the longitudinal direction in the connection terminal connection portion 1400, and at an end on the side opposite to the positive electrode terminal connection portion 1200 in the short hand direction. Therefore, the first notch 1240 and the third notch 1370 are formed to face each other.

[0101] By providing the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400 with the first notch 1240 and the third notch 1470, these notches serve as marks, enabling each battery 100 to be installed at an appropriate position, and ensuring the contact between the first metal layer 210 and the positive electrode terminal 61 and the contact between each terminal of the connection terminal connection portion 300 and each connection terminal 70. Also, by aligning the longitudinal sides of the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400 with the longitudinal sides of each battery 100, and arranging the first notch 1240 and the third notch 1470 between the batteries 100 arranged in the longitudinal direction (when no terminal for external connection is arranged at the longitudinal end of the positive electrode terminal connection portion 1200, aligning the short hand side of the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400 at that end with one short hand side of the battery 100 arranged at that end), the outer peripheral portions of the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400, the first notch 1240, and the third notch 1470 make it easier to position each battery 100. In this case, the size of each battery 100 can be increased compared to the case of using the positive electrode terminal connection portion 200 and the connection terminal connection portion 400 (alternatively, the size of the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400 can be reduced).

[0102] As shown in FIG. 16, the negative electrode terminal connection portion 1300 has substantially the same configuration as the negative electrode terminal connection portion 300, but is different in that it includes a second notch 1340 instead of the second positioning portion 340. The second notch 1340 is a portion (second connection portion) between the batteries 100 adjacent in the longitudinal direction in the negative electrode terminal connection portion 1300, and is formed at both ends in the short-side direction.

[0103] The effects of the negative electrode terminal connection portion 1300 are the same as those of the positive electrode terminal connection portion 1200 and the connection terminal connection portion 1400. In FIG. 16, a form is shown in which the longitudinal side of the negative electrode terminal connection portion 1300 is aligned with the longitudinal side of each battery 100, and the second notch 1340 is arranged between the batteries 100 arranged in the longitudinal direction. Also in FIG. 16, since no terminal for external connection is arranged at one end in the longitudinal direction of the negative electrode terminal connection portion 1300, the short-side of the negative electrode terminal connection portion 1300 at that end is aligned with one short-side of the battery 100 arranged at that end. As shown in FIG. 16, the negative electrode terminal connection portion 1300 can increase the size of each battery 100 (alternatively, the size of the negative electrode terminal connection portion 1300 can be reduced) compared to the case where the negative electrode terminal connection portion 300 is used.

[0104] As described above, according to the connection member of other forms, the size of each battery 100 can be increased (alternatively, the size of the connection member can be reduced), and the structural efficiency of the assembled battery structure can be further improved.

[0105] As described above, one embodiment of the assembled battery structure of the present disclosure has been shown and described. According to the assembled battery structure of the present disclosure, the structural efficiency can be improved.

[0106] [Assembled battery composite structure 2000] Subsequently, the assembled battery composite structure of the present disclosure will be described using an assembled battery composite structure 2000 which is one embodiment.

[0107] Fig. 17 shows a plan view of the assembled battery composite structure 2000. As shown in Fig. 17, the assembled battery composite structure 2000 has a plurality of assembled battery structures 1000 and a connecting member 1100 for connecting the plurality of assembled battery structures 1000. Since the assembled battery structure 1000 has been described above, the description thereof will be omitted here.

[0108] <Connecting member 1100> Fig. 18 shows a plan view of only the connecting member 1100 taken out. The connecting member 1100 includes a plurality of connecting terminals, and each connecting terminal is electrically connected to each of the terminal wirings 440a to 440h of each assembled battery structure 1000. The plurality of connecting terminals are divided for each assembled battery structure 1000 to be connected, and the divided groups of terminals are defined as connecting terminal groups 1110 and 1120. The connecting member 1100 has connector recesses 1130 and 1140 that house the respective connecting terminal groups 1110 and 1120, and each of the connector recesses 1130 and 1140 is connected to each connector protrusion 460 of the assembled battery structure 1000. Thereby, each connecting terminal included in each of the connecting terminal groups 1110 and 1120 is connected to each of the terminal wirings 440a to 440h of each assembled battery structure 1000. Further, the connecting member 1100 has a substrate 1160, and the substrate 1160 includes a plurality of connecting terminal wirings 1150a to 1150h therein. Furthermore, the connecting member 1100 includes a connector 1170 for collecting the connecting terminal wirings 1150a to 1150h and connecting them to the outside.

[0109] Each connecting terminal included in the connecting terminal group 1110 is in contact with each of the connecting terminal wirings 1150a to 1150h of the assembled battery structure 1000 in a one-to-one relationship and is electrically connected. Therefore, battery information (information such as voltage and current) of the electrode laminate 50 included in the assembled battery structure 1000 can be obtained from the connecting terminal wirings 1150a to 1150h.

[0110] Similarly, for the connection terminal group 1120, each connection terminal included in the connection terminal group 1120 is in one-to-one contact with the connection terminal wirings 1150a to 1150h of another battery module structure 1000 and is electrically connected. On the other hand, the connection terminal group 1120 is connected to the same connection terminal wirings 1150a to 1150h as the connection terminal group 1110. That is, the connection terminal wirings 1150a to 1150h are shared by the connection terminal groups 1110 and 1120, and the connection terminal groups 1110 to 1120 are connected in parallel. This is the same as the connection relationship between each terminal group 410 to 430 and each terminal wiring 440a to 440c in the battery module structure 1000. Therefore, the corresponding connection terminals of each connection terminal group 1110 to 1120 are connected in parallel to one connection terminal wiring. As a result, the number of connection terminal wirings can be reduced and the structure can be simplified.

[0111] However, the battery module composite structure 2000 is not limited to this mode. That is, the connection terminal wirings do not have to be connected in parallel as described above, and may be in a form in which only one connection terminal is connected to one connection terminal wiring. Thereby, battery information can be obtained from each individual connection terminal. Therefore, the connection terminal wiring only needs to be electrically connected to at least one connection terminal.

[0112] As shown in FIG. 15, in the battery module composite structure 2000, since the connection terminal connection portion 400 of each battery module structure 1000 and the connecting member 1100 are arranged on the same surface, it contributes to an improvement in structural efficiency. Further, in the battery module composite structure 2000, each battery module structure 1000 and the connecting member 1100 can be easily connected only by connecting the connector convex portion 460 provided in each battery module structure 1000 and the connector concave portions 1130 and 1140 provided in the connecting member 1100.

[0113] Note that in the battery module composite structure 2000, although the connecting member 1100 is a member different from the connection terminal connection portion 400 of the battery module structure, it is not limited to this form, and these may be integrated.

[0114] The connecting member 1100 is a sheet-like member having flexibility, like the positive terminal connection portion 200, the negative terminal connection portion 300, and the connection terminal connection portion 400 of each set of battery structures 1000. Specifically, the connection substrate 1160 (including the connection terminals wiring 1140a to 1140h) of the connecting member 1100 has flexibility. Therefore, the assembled battery composite structure 2000 can have various forms, not just the form in which the assembled battery structures 1000 are arranged side by side.

[0115] As described above, one embodiment of the assembled battery composite structure of the present disclosure has been shown and described. According to the assembled battery composite structure of the present disclosure, since it includes the above-described assembled battery structure, the structural efficiency can be improved. Also, according to the assembled battery composite structure, the above-described assembled battery structures can be easily connected.

[0116] [Battery Structure, Battery Composite Structure] The assembled battery structure of the present disclosure includes a plurality of batteries, but it may be in a form that includes only one battery. That is, the present disclosure may provide a battery structure. Also, the present disclosure may provide a battery composite structure including a plurality of battery structures. The battery structure and the battery composite structure will be described below. The details of each member are as described above.

[0117] The battery structure of the present disclosure has a battery and a connecting member connected to the battery. The battery includes a first terminal disposed on one surface in the thickness direction, a second terminal disposed on the other surface, and a plurality of connection terminals disposed on the same surface as the first terminal. The connecting member includes a first terminal connection portion, a second terminal connection portion, and a connection terminal connection portion. The first terminal connection portion includes a first metal layer, and the first metal layer is electrically connected to the first terminal of the battery. The second terminal connection portion includes a second metal layer, and the second metal layer is electrically connected to the second terminal of the battery. The connection terminal connection portion includes a plurality of terminals, and each terminal is electrically connected to each connection terminal of the battery. The first terminal connection portion and the connection terminal connection portion are disposed on the same surface.

[0118] The battery composite structure of the present disclosure has a plurality of the above battery structures and a connecting member that connects the plurality of battery structures. The connecting member includes a plurality of connecting terminals, and each connecting terminal is electrically connected to each terminal wiring of the battery structure.

Explanation of Signs

[0119] 11 End face positive electrode current collector 12 End face negative electrode current collector 20 Internal current collector 21 Main body part 22 Connection part 23 Extended part 24 End part 30 End face insulating layer 40 Side face insulating layer 50 Electrode laminate 50a Side face 61 Positive electrode terminal 62 Negative electrode terminal 70(70a~70h) Connection terminal 71 Through hole 72 Metal part 73 Insulating layer 90 Exterior body 91 Positive electrode exterior body 92 Negative electrode exterior body 93, 94 Resin 95 Insulating layer 100 Battery 200, 1200 Positive electrode terminal connection part 210 First metal layer 220 First base material layer 230 First insulating layer 240 First positioning part 1240 First notch 300, 1300 Negative electrode terminal connection part 310 Second metal layer 320 Second base material layer 330 Second insulating layer 340 Second positioning part 1340 Second notch 400, 1400 Connection terminal connection part 410, 420, 430 Terminal group 411a~411h Terminals Terminals 421a to 421h Terminals 431a to 431h Wiring for terminals 440a to 440h Substrate 450 Connector projection 460 Third notch 1470 Connection member 500 Battery pack structure 1000 Connecting member 1100 Connection terminal groups 1110 and 1120 Connector recesses 1130 and 1140 Wiring for connection terminals 1150a to 1150h Connection substrate 1160 Connector 1170 Battery pack composite structure 2000

Claims

1. A battery assembly structure having a plurality of batteries and a connection member connected to the plurality of batteries, the battery includes a first terminal disposed on one surface in a thickness direction, a second terminal disposed on the other surface in the thickness direction, and a plurality of connection terminals disposed on the same surface as the first terminal; the connecting member includes a first terminal connecting portion, a second terminal connecting portion, and a connecting terminal connecting portion; the first terminal connection portion includes a first metal layer, the first metal layer electrically connected to the first terminal of each of the batteries; the second terminal connection portion includes a second metal layer, the second metal layer electrically connected to the second terminal of each of the batteries; the connection terminal connection portion includes a plurality of terminals, each of the terminals being electrically connected to a corresponding one of the connection terminals of each of the batteries; The first terminal connection portion and the connection terminal connection portion are disposed on the same plane. Assembled battery structure.

2. the connection terminal connection portion has a substrate supporting a plurality of the terminals, The substrate includes a plurality of terminal wirings, The terminal wiring is electrically connected to at least one of the terminals. The battery assembly according to claim 1 .

3. The plurality of terminals are divided into sections for each of the batteries, When a group of the terminals is classified as a terminal group, The corresponding terminals of each of the terminal groups are connected in parallel to one of the terminal wirings. The battery assembly according to claim 1 .

4. The battery assembly according to claim 1 , wherein the first terminal connection portion and the connection terminal connection portion are integrated together.

5. The battery assembly according to claim 1 , wherein the first terminal connection portion, the second terminal connection portion, and the connection terminal connection portion are flexible.

6. A battery assembly composite structure having a plurality of battery assembly assemblies according to any one of claims 1 to 5 and a connecting member that connects a plurality of the battery assembly assemblies, the connecting member includes a plurality of connecting terminals, each of the connecting terminals being electrically connected to each of the terminal wirings of each of the battery pack structures; Assembled battery composite structure.

Images