Battery pack structure and battery pack composite structure

Abstract

The invention relates to a battery pack structure and a battery pack composite structure. The battery pack structure includes a plurality of batteries each including 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, and a connection member connected to the plurality of batteries. 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 electrically connected to the first terminal of each battery, the second terminal connection portion includes a second metal layer electrically connected to the second terminal of each battery, and the connection terminal connection portion includes a second metal layer electrically connected to the second terminal of each battery. The connection terminal connection part is provided with a plurality of terminals, each terminal is electrically connected with each connection terminal of each battery, and the first terminal connection part and the connection terminal connection part are arranged on the same plane.

Description

Technical Field

[0001] The present application relates to a battery pack structure and a battery pack composite structure. Background Art

[0002] Japanese Patent Application Laid-Open No. 2006-127857 discloses a bipolar battery in which connection terminals are led out from a side surface.

[0003] However, since the connection terminals are drawn out from the side surfaces, components connected to the connection terminals need to be arranged on the side surfaces, which causes a problem that the size of the entire battery increases. Summary of the invention

[0004] Therefore, in view of the above actual situation, the main purpose of the present disclosure is to provide a battery pack structure that can improve structural efficiency. In addition, another purpose of the present disclosure is to provide a battery pack composite structure for the above battery pack structure.

[0005] The present disclosure provides at least the following aspects.

[0006] A battery pack structure of the first embodiment has multiple batteries and connecting components connected to the multiple batteries, wherein the battery has a first terminal arranged on one surface in the thickness direction, a second terminal arranged on another surface in the thickness direction, and multiple connecting terminals arranged on the same surface as the first terminal, and the connecting component has a first terminal connecting part, a second terminal connecting part and a connecting terminal connecting part, the first terminal connecting part has a first metal layer, the first metal layer is electrically connected to the first terminal of each battery, the second terminal connecting part has a second metal layer, the second metal layer is electrically connected to the second terminal of each battery, the connecting terminal connecting part has multiple terminals, each terminal is electrically connected to each connecting terminal of each battery, and the first terminal connecting part and the connecting terminal connecting part are arranged on the same surface.

[0007] A second aspect is the battery pack structure according to the first aspect, wherein the terminal connection portion includes a substrate supporting a plurality of terminals, the substrate includes a plurality of terminal wirings, and the terminal wiring is electrically connected to at least one of the terminals.

[0008] A third aspect is a battery pack structure according to the first aspect or the second aspect, wherein the plurality of terminals are divided for each battery, and when a group of divided terminals is used as a terminal group, corresponding terminals of each terminal group are connected in parallel to one terminal wiring.

[0009] A 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.

[0010] A fifth aspect In the battery pack structure according to any one of the first aspect to the fourth aspect, the first terminal connection portion, the second terminal connection portion, and the connection terminal connection portion have flexibility.

[0011] The sixth aspect of the battery pack composite structure comprises a plurality of battery pack structures according to any one of the first aspect to the fifth aspect and a connecting member connecting the plurality of battery pack structures, wherein the connecting member comprises a plurality of connecting terminals, each connecting terminal being electrically connected to each terminal of each battery pack structure by wiring.

[0012] According to the battery pack structure and the battery pack composite structure disclosed in the present invention, the structural efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0014] Figure 1 1 is a top view of the battery pack structure 1000 .

[0015] Figure 2 is Figure 1 2 is a cross-sectional view of the battery pack structure 1000 taken along line II-II.

[0016] Figure 3 is a top view of the battery 100 .

[0017] Figure 4A is Figure 3 FIG. 1 is a cross-sectional view of the battery 100 taken along line IV-IV.

[0018] Figure 4B is an exploded cross-sectional view of the battery 100 .

[0019] Figure 5 It is a plan view of the electrode stack 50 .

[0020] Fig. 6A is from Figure 5 A front view of the electrode stack 50 viewed in the direction A.

[0021] Figure 6B is from Figure 5 A side view of the electrode stack 50 viewed from the B direction.

[0022] Fig. 7A It is a top view of the internal current collector 20 .

[0023] Figure 7B It is a plan view of a plurality of internal current collectors 20 for explaining the differences in the positions and lengths of the connecting portions 22 .

[0024] Figure 8 It is a cross-sectional view of an electrode stack 50 as an example.

[0025] Fig. 9 This is a partial cross-sectional view focusing on one connection terminal 70 .

[0026] Fig.10 This is a diagram showing an example of a method of providing the connection terminal 70 on the exterior body 90 .

[0027] Fig.11 It is a bottom view of the positive electrode terminal connecting portion 200 and the connecting terminal connecting portion 400 .

[0028] Fig.12 It is a top view of the negative electrode terminal connecting portion 300 .

[0029] Fig.13A This is a cross-sectional view focusing on the terminal group 410 , and is a view showing a cross section where the terminal 411 a and the terminal wiring 412 a are connected.

[0030] Fig. 13B This is a cross-sectional view focusing on the terminal group 410 , and is a view showing a cross section where the terminal 411 b and the terminal wiring 412 b are connected.

[0031] Fig.14 The figure shows the state of a battery pack structure in which the batteries 100 are stacked in a zigzag manner.

[0032] Fig.15 It is a bottom view of a positive electrode terminal connecting portion 1200 and a connecting terminal connecting portion 1400 as other forms.

[0033] Fig.16 It is a top view of a negative electrode terminal connecting portion 1300 as another form.

[0034] Fig.17 2 is a top view of the battery pack composite structure 2000 .

[0035] Fig.18 1100 is a top view of the connection member 1100 . DETAILED DESCRIPTION

[0036] [Battery pack structure]

[0037] The battery pack structure of the present disclosure will be described using a battery pack structure 1000 as one embodiment.

[0038] The battery pack structure 1000 includes a plurality of batteries 100 and a connection member 500 connected to the plurality of batteries 100 . Figure 1 A top view of the battery pack structure 1000 is shown. Figure 2 Indicated in Figure 1The sectional view taken at II-II. Figure 1 In the figure, the terminals 411a to 411h, 421a to 421h, and 431a to 431h disposed inside the battery pack structure 1000 are indicated by dotted lines (see Fig.11 ) and battery 100 (refer to Figure 3 ).

[0039] <Battery 100>

[0040] First, the battery 100 is described. The battery 100 includes a first terminal arranged on one surface in the thickness direction, a second terminal arranged on another surface in the thickness direction, and a plurality of connection terminals arranged on the same surface as the first terminal. Hereinafter, a method of using the first terminal as a positive terminal 61 and the second terminal as a negative terminal 62 is described. However, the first terminal may also be a negative terminal, and the second terminal may also be a positive terminal. However, the first terminal and the second terminal are set to be different poles.

[0041] Figure 3 A top view of the battery 100 is shown. Figure 4A Indicated in Figure 3 A cross-sectional view of the battery 100 cut at IV-IV, Figure 4B Indicates its exploded sectional view. Figure 3 , Figure 4A , Figure 4B As shown, the battery 100 includes an electrode stack 50 and an exterior body 90 , and the electrode stack 50 is provided inside the exterior body 90 .

[0042] (Electrode Laminated Body 50)

[0043] The electrode stack 50 will be described. Figure 5 A plan view of the electrode stack 50 is shown. Fig. 6A Indicates from Figure 5 A front view of the electrode stack 50 viewed from the direction A, Figure 6B Indicates from Figure 5 A side view of the electrode stack 50 viewed from the B direction.

[0044] The electrode stack 50 has a rectangular shape when observed in the stacking direction (observed in the thickness direction), and is a stack including a collector (a positive electrode collector and a negative electrode collector), a positive electrode layer, a negative electrode layer, and an electrolyte layer. In the electrode stack 50, the number of stacking layers of each layer is not particularly limited and can be appropriately set according to the purpose. The stacking method of the electrode stack 50 is not particularly limited and can be a monopolar type or a bipolar type. The electrode stack 50 can be a liquid battery or a solid-state battery. The electrode stack 50 can be a lithium ion battery, a sodium ion battery, a nickel-hydrogen battery, etc. The electrode stack 50 can be a primary battery or a secondary battery.

[0045] Material of the electrode stack 50

[0046] A typical example of the material of each layer constituting the electrode stack 50 will be described below. However, the material of each layer constituting the electrode stack 50 is not limited to this.

[0047] The current collector is a sheet-like conductive component. Examples of the current collector include metal foils such as stainless steel, iron, copper, aluminum, titanium, and nickel. The metal foil may also be composed of an alloy containing two or more of these metals. In addition, the metal foil may also be subjected to a prescribed surface treatment such as electroplating. The current collector may also be composed of a plurality of metal foils. In this case, the metal foils may be joined by an adhesive or the like, or by stamping or the like. The shape of the current collector may be rectangular. The thickness of the current collector is not particularly limited, and may be, for example, 1 μm to 1 mm.

[0048] The positive electrode layer contains at least a positive electrode active material. The positive electrode active material is not particularly limited and can be appropriately selected from any material according to the target battery performance. For example, composite oxides, metallic lithium, and sulfur can be cited. The composition of the composite oxide, for example, contains at least one of iron, manganese, titanium, nickel, cobalt, and aluminum and lithium. Examples of composite oxides include olivine-type lithium iron phosphate (LiFePO4) and the like.

[0049] The positive electrode layer may also contain a conductive auxiliary agent. The conductive auxiliary agent is not particularly limited and can be appropriately selected from any material according to the target battery performance. For example, carbon materials such as acetylene black, carbon black, and graphite can be cited.

[0050] The positive electrode layer may also contain a binder. The binder is not particularly limited and can be appropriately selected from any material according to the target battery performance. For example, rubber-based resins, fluoride-based resins, etc. can be cited.

[0051] The positive electrode layer may also contain a solid electrolyte. The solid electrolyte is not particularly limited and can be appropriately selected from any material according to the target battery performance. For example, oxide solid electrolytes, sulfide solid electrolytes, etc. can be cited.

[0052] The positive electrode layer may be rectangular. The thickness of the positive electrode layer is not particularly limited, 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. It should be noted that the positive electrode layer may contain materials other than the above-mentioned materials.

[0053] The negative electrode layer contains a negative electrode active material. The negative electrode active material is not particularly limited and can be appropriately selected from any material according to the target battery performance. For example, carbon materials such as graphite, artificial graphite, hard carbon, soft carbon, metal compounds, elements that can be alloyed with lithium or their compounds, etc. can be cited. Examples of elements that can be alloyed with lithium include silicon (Si) and tin.

[0054] The negative electrode layer may also contain a conductive aid. The conductive aid is not particularly limited and may be appropriately selected from any material according to the target battery performance. For example, it may be appropriately selected from conductive aids that can be applied to the positive electrode layer.

[0055] The negative electrode layer may also contain a binder as desired. The binder is not particularly limited and may be appropriately selected from any material according to the target battery performance. For example, it may be appropriately selected from binders that can be applied to the positive electrode layer.

[0056] The negative electrode layer may also contain a solid electrolyte. The solid electrolyte is not particularly limited and may be appropriately selected from any material according to the target battery performance. For example, it may be appropriately selected from solid electrolytes that can be applied to the positive electrode layer.

[0057] The negative electrode layer may be rectangular. The thickness of the negative electrode layer is not particularly limited, for example, in the range of 1 μm to 1 mm. From the perspective of increasing 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. It should be noted that the negative electrode layer may contain materials other than the above-mentioned materials.

[0058] When the electrolyte layer is a liquid electrolyte layer, the electrolyte layer includes a separator and an electrolyte. The separator is mainly a porous sheet of a polyolefin system. The electrolyte is an electrolyte in which a supporting electrolyte is dissolved in a non-aqueous solvent. As non-aqueous solvents, carbonates, ethers, esters, etc. can be cited. Examples of supporting electrolytes include LiPF6, LiBF4, lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethane)sulfonylimide (LiTFSI), etc.

[0059] When the electrolyte layer is a solid electrolyte layer, the electrolyte layer contains a solid electrolyte. In addition, the solid electrolyte layer may also contain a binder. The solid electrolyte and the binder can be appropriately selected from the above-mentioned solid electrolytes and binders.

[0060] 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.

[0061] End positive electrode current collector 11, end negative electrode current collector 12, internal current collector 20

[0062] like Figure 5 , Fig. 6A , Figure 6B As described, the electrode stack 50 includes a positive electrode collector (sometimes referred to as "end face positive electrode collector 11" in this specification) arranged on one face in the stacking direction (thickness direction) and a negative electrode collector (sometimes referred to as "end face negative electrode collector 12" in this specification) arranged on the other face in the stacking direction. In addition, the electrode stack 50 includes a collector (sometimes referred to as "internal collector 20" in this specification) inside. It should be noted that Figure 6B In the figure, layers other than the end surface positive electrode collector 11, the end surface negative electrode collector 12, and the internal current collector 20 vary depending on the target battery and are therefore not specifically shown.

[0063] The number of internal current collectors 20 is not particularly limited and can be appropriately set according to the purpose. Figure 5 , Fig. 6A , Figure 6B In the embodiment of the present invention, a plurality of internal current collectors 20 (a total of 8) are arranged inside the electrode stack 50. The internal current collector 20 may be a positive electrode current collector or a negative electrode current collector. In addition, the internal current collector 20 may be a current collector of the same type or a current collector of a different type. However, as described later, the internal electrode 20 has the function of providing battery information to the outside, and therefore, all of them may be composed of the same type of current collector (preferably a positive electrode current collector). In addition, the electrode stack 50 may also have a common current collector other than the internal current collector 20 inside it.

[0064] The internal current collector 20 is different from other current collectors in that it has a connection portion 22 drawn out from the side surface of the electrode stack 50 . Fig. 7A 2 is a top view showing the internal current collector 20, Figure 7B A plurality of internal current collectors 20 are shown for explaining the differences in the positions of the connection portions 22 .

[0065] like Fig. 7A As shown, the internal current collector 20 includes a main body 21 and a connecting portion 22. The main body 21 is a portion that is stacked inside the electrode stack 50 and functions as a current collector. Therefore, a positive electrode layer or a negative electrode layer is stacked on the main body 21. The main body 21 has a rectangular shape. In contrast, the connecting portion 22 is a portion for providing battery information (voltage, current, etc.) to the outside, and has a long and thin strip shape. The connecting portion 22 is used, for example, as a voltage monitoring line. As shown in FIG. Figure 5 , Fig. 6A , Figure 6B As shown, the connecting portion 22 has a form of being led out from the side surface 50a of the electrode stack 50, and the led out connecting portion 22 is bent in the stacking direction. Moreover, the end of the connecting portion 22 is further bent and arranged on the same surface as the end face positive electrode collector 11. In this way, the connecting portion 22 is characterized in that it extends along the stacking direction on the side surface 50a of the electrode stack 50 and is arranged on the same surface as the end face positive electrode collector 11.

[0066] In conventional batteries, the connection portion that functions as a voltage monitoring line is maintained in a state of being led out in the side direction. In contrast, in the electrode stack 50, the connection portion 22 has a portion extending along the stacking direction on the side of the electrode stack 50, thereby reducing the area occupied by the connection portion 22 in the entire battery 100. Therefore, the electrode stack 50 can improve the structural efficiency.

[0067] Here, the portion of the connecting portion 22 that is drawn out from the side surface of the electrode stack 50 and extends in the stacking direction from the side surface 50 a is referred to as the extending portion 23 , and the portion of the connecting portion 22 that is arranged on the same surface as the end face positive electrode current collector 11 is referred to as the end portion 24 .

[0068] like Figure 7B As shown, the position of the connection portion 22 in the internal current collector 20 is not particularly limited. Figure 5 , Fig. 6A , Figure 6B As shown in FIG. 1 , the connection portions 22 drawn from the plurality of internal current collectors 20 can be arranged at positions that do not overlap each other when viewed from the stacking direction. This can suppress contact between the connection portions 22 and simplify the battery structure. Figure 7B As shown, the length of the connecting portion 22 can be arbitrarily set according to the position of the end portion 24 .

[0069] Here, “the connection portion 22 and the end face positive electrode current collector 11 are arranged on the same surface” will be further described. Figure 5 , Fig. 6A , Figure 6B As shown, the end 24 of the connection portion 22 is arranged on the end face positive electrode collector 11 via the end face insulating layer 30. Therefore, strictly speaking, it cannot be said that the end 24 of the connection portion 22 and the end face positive electrode collector 11 are arranged on the same surface, but because 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 and the end face positive electrode collector 11 are arranged on the same surface" does not strictly mean that the end 24 of the connection portion 22 and the end face positive electrode collector 11 are arranged on the same surface, which means that from the perspective of use, the end 24 of the connection portion 22 and the end face positive electrode collector 11 can be arranged on the same surface.

[0070] In the electrode stack 50 , the connection portion 22 is disposed on the same surface as the end surface positive electrode collector 11 , but the present invention is not limited thereto. The connection portion 22 may be disposed on the same surface as the end surface negative electrode collector 12 .

[0071] Therefore, the electrode stack 50 only needs to have a first end face current collector disposed on one face in the stacking direction, a second end face current collector disposed on the other face in the stacking direction, an internal current collector 20 stacked inside the electrode stack 50, the internal current collector 20 having a connection portion 22 drawn from the side face 50a of the electrode stack 50, the connection portion 22 extending along the side face 50a of the electrode stack 50 in the stacking direction and disposed on the same face 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.

[0072] End surface insulation layer 30

[0073] The electrode stack 50 has an end face insulating layer 30. The end face insulating layer 30 is arranged on a part of the end face positive electrode collector 11. Moreover, the connection portion 22 (end portion 24) is arranged on the end face positive electrode collector 11 via the end face insulating layer 30, and the end face insulating layer 30 insulates the end face 24 from the end face positive electrode collector 11. In this way, the end face insulating layer 30 is arranged between the end face 24 and the end face positive electrode collector 11, and has the function of insulating them.

[0074] The material of the end face insulating layer 30 is not particularly limited, and examples thereof include polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, and the like. The thickness of the end face insulating layer 30 is not particularly limited, and for example, it is 5 μm to 300 μm. The configuration 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 collector 11. In addition, a resin sheet may be configured between the end face positive electrode collector 11 and the end 24 of the connecting portion 22. Alternatively, a resin material may be applied to the end face positive electrode collector 11.

[0075] It should be noted that the end face insulating layer 30 may also be disposed at the end portion 24. Even if the end face insulating layer 30 is disposed at the end portion 24, the end portion 24 and the end face positive electrode collector 11 can be insulated by the end face insulating layer 30. Therefore, the end face insulating layer 30 only needs to be disposed between the end portion 24 and the end face positive electrode collector 11.

[0076] Side insulation layer 40

[0077] The electrode stack 50 has a side insulating layer 40. The side insulating layer 40 is disposed on the side 50a of the electrode stack 50. Moreover, the connecting portion 22 (extending portion 23) and the side 50a of the electrode stack 50 are insulated by the side insulating layer 40. In this way, the side insulating layer 40 is disposed on the side 50a, and has the function of insulating the extending portion 23 from the side 50a. Therefore, the side insulating layer 40 only needs to be disposed on at least a portion of the side 50a. The side insulating layer 40 may also be disposed on the entire side 50a.

[0078] The material of the side insulating layer 40 is not particularly limited, and examples thereof include polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, and the like. The thickness of the side insulating layer 40 is not particularly limited, and is, for example, 5 μm to 300 μm. The configuration method of the side insulating layer 40 is not particularly limited, and for example, a resin tape may be attached to the side 50 a of the electrode stack 50. In addition, a resin sheet may be disposed between the side 50 a of the electrode stack 50 and the extension 23 of the connection portion 22. Alternatively, a resin material may be applied to the side 50 a of the electrode stack 50.

[0079] It should be noted that the side insulating layer 40 may also be disposed on the extension portion 23. Even if the side insulating layer 40 is disposed on the extension portion 23, the extension portion 23 and the side surface 50a of the electrode stack 50 can be insulated by the side insulating layer 40. Therefore, the side insulating layer 40 only needs to be disposed on at least one of the extension portion 23 and the side surface 50a of the electrode stack 50.

[0080] (Stacking Method of Electrode Stack 50)

[0081] As described above, the electrode stack 50 is a stack including a current collector, a positive electrode layer, an electrolyte layer, and a negative electrode layer, and has end current collectors 11 and 12 stacked on both sides of the electrode stack 50 in the stacking direction and a plurality of internal current collectors 20 therein. Other structures are not particularly limited. Fig. 6A , Figure 6B A cross-sectional view of an electrode stack 50 is shown as an example. Figure 8 The electrode stack 50 shown is an electrode stack for a bipolar lithium ion secondary battery.

[0082] like Figure 8 As shown, the electrode stack 50 is formed by stacking a plurality of electrode bodies 56. In the electrode stack 50, the number of electrode bodies 56 is not particularly limited and can be appropriately set according to the purpose.

[0083] The electrode body 56 includes a positive electrode collector 51, a negative electrode collector 52, a positive electrode layer 53, a negative electrode layer 54, and an electrolyte layer 55. The electrode body 56 is formed by stacking the negative electrode layer 54 disposed on the upper surface of the negative electrode collector 52 and the positive electrode layer 53 disposed on the lower surface of the positive electrode collector 51 via the electrolyte layer 55. The electrode stack 50 is formed by stacking a plurality of electrode bodies 56 in a manner that the electrode bodies 56 are connected in series.

[0084] Here, the positive electrode collector 51 disposed on one surface of the electrode stack 50 in the stacking direction corresponds to the end face positive electrode collector 11, and the negative electrode collector 52 disposed on the other surface in the stacking direction corresponds to the end face negative electrode collector 12. In addition, the positive electrode collector 51 or the negative electrode collector 52 contained in the electrode stack 50 corresponds to the internal collector 20. Figure 8 In the embodiment of the present invention, the positive electrode current collector 51 included in the electrode stack 50 is referred to as the internal current collector 20 .

[0085] (External body 90)

[0086] The outer casing 90 is made of metal. Figure 3 , Figure 4A , Figure 4B As shown in FIG. 1 , the outer casing 90 has a rectangular shape when viewed in the thickness direction. The outer casing 90 is a box-shaped member having a space inside which the electrode stack 50 can be housed.

[0087] Basic structure of the outer casing 90

[0088] First, the basic structure of the outer casing 90 will be described. The outer casing 90 includes a positive electrode outer casing 91 and a negative electrode outer casing 92. In addition, the outer casing 90 includes insulating resins 93 and 94.

[0089] The positive electrode outer package 91 is made of metal and has a box-like shape, which has a rectangular bottom plate 91a and four side plates 91b on each side of the bottom plate 91a. That is, the positive electrode outer package 91 has a U-shaped cross section. In addition, 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-like shape, which has a rectangular bottom plate 92a and four side plates 92b on each side of the bottom plate 92a. That is, the negative electrode outer package 92 has a U-shaped cross section. In addition, the surface of the negative electrode outer package 92 facing the bottom plate 92a is open. Moreover, the positive electrode outer package 91 and the negative electrode outer package 92 are overlapped in a manner that the bottom plates of each other are opposite in the stacking direction and the side plates of each other are opposite in a direction orthogonal to the stacking direction. Thus, a space capable of accommodating the electrode stack 50 can be formed inside the exterior body 90 .

[0090] Here, the bottom plate 91a of the positive electrode outer casing 91 is formed to have a larger area than the bottom plate 92a of the negative electrode outer casing 92. Therefore, when the electrode stack 50 is housed in the outer casing 90, the side plate 92b of the negative electrode outer casing 92 is arranged inside the side plate 91b of the positive electrode outer casing 91.

[0091] 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 thickness of the positive electrode outer package 91 and the negative electrode outer package 92 is not particularly limited, and is, for example, 0.05 mm to 2.0 mm.

[0092] The resin 93 is disposed between the side surface of the electrode stack 50 and the side plate 92b of the positive electrode outer package 91. Thus, the side surface of the electrode stack 50 and the side plate 92b of the positive electrode outer package 91 are insulated and can be fixed. The resin 94 is disposed between the side plate 91b of the positive electrode outer package 91 and the side plate 92b of the negative electrode outer package 92. Thus, the side plate 91b of the positive electrode outer package 91 and the side plate 92b of the negative electrode outer package 92 are insulated and can be fixed.

[0093] Such a basic structure of the exterior body 90 is described in, for example, Japanese Patent Application No. 2023-006850.

[0094] Characteristic structure of the outer casing 90

[0095] Next, the characteristic parts of the outer casing 90 are described. The outer casing 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.

[0096] The positive electrode terminal 61 is the bottom plate 91a of the positive electrode outer casing 91 and is exposed to the outside. Typically, the bottom plate 91a of the positive electrode outer casing 91 may be provided with an insulating layer on the inner surface except for the portion in contact with the end face positive electrode current collector 11, and the outer surface may be provided with an insulating layer 95 on the portion except for the portion connected to the outside (see Figure 3 ,exist Figure 4A , Figure 4B(not shown in the figure). In this case, the positive terminal 61 is a portion of the bottom plate 91a of the positive electrode outer casing 91 that is not provided with an insulating layer and is exposed to the outside. The same is true for the negative terminal 62. The negative terminal 62 is the bottom plate 92a of the negative electrode outer casing 92 and is a portion exposed to the outside. Typically, in the bottom plate 92a of the negative electrode outer casing 92, an insulating layer may be provided on the inner surface except for the portion in contact with the end face negative electrode collector 12, and an insulating layer may be provided on the outer surface except for the portion connected to the outside. In this case, the negative terminal 62 is a portion of the bottom plate 92a of the negative electrode outer casing 92 that is not provided with an insulating layer and is exposed to the outside.

[0097] It should be noted that both surfaces of the side plate 91b of the positive electrode outer casing 91 and the side plate 92b of the negative electrode outer casing 92 may be covered with an insulating layer. In this way, the inner surface of the side plate of the outer casing 90 (the inner surface of the side plate 92b of the negative electrode outer casing 92) can be insulated from the electrode stack 50. In addition, the outer surface of the side plate of the outer casing 90 (the outer surface of the side plate 91b of the positive electrode outer casing 91) can be insulated from external components.

[0098] Here, the positive terminal 61 is in direct contact with and electrically connected to the positive electrode collector 11 at the end face of the electrode stack 50 inside the outer casing 90. The negative terminal 62 is in direct contact with and electrically connected to the negative electrode collector 12 at the end face of the electrode stack 50 inside the outer casing 90. Therefore, both end faces of the outer casing 90 in the stacking direction function as terminals. In this way, the positive terminal 61 and the negative terminal 62 are electrically connected to the positive electrode collector 11 at the end face of the electrode stack 50 and the negative electrode collector 12 at the end face inside the outer casing 90, so that airtightness and gas barrier properties can be ensured.

[0099] It should be noted that, from the perspective of improving structural efficiency, the positive terminal 61 and the end face positive electrode collector 11 are directly in contact and electrically connected inside the outer casing 90, but this is not limited to this method. The positive terminal 61 and the end face positive electrode collector 11 may also be indirectly electrically connected inside the outer casing 90 via a conductive component or the like. The same is true for the negative terminal 62.

[0100] The connection terminal 70 is electrically connected to the connection portion 22 (end portion 24) of the electrode stack 50, and has the function of providing information of the electrode stack 50 to the outside. The connection terminal 70 is arranged on the bottom plate 91a of the positive electrode outer casing 91. That is, the connection terminal 70 and the positive electrode terminal 61 are arranged on the same surface. The connection terminal 70 is directly in contact with the end portion 24 of the connection portion 22 inside the outer casing 90 and is electrically connected. The number of the connection terminals 70 corresponds to the number of the connection portions 22, and each connection terminal 70 is connected to each connection portion 22.

[0101] The specific structure of the connection terminal 70 will be described. Fig. 92 is a partial cross-sectional view focusing on the connection terminal 70. Fig. 9 As shown, the connection terminal 70 includes a through hole 71 that penetrates the end surface of the outer casing 90 (the bottom plate 91 a of the positive electrode outer casing 91 ) in the stacking direction, a metal portion 72 disposed in the through hole 71 , and an insulating layer 73 disposed between the through hole 71 and the metal portion 72 .

[0102] The through hole 71 penetrates the end surface of the outer casing 90 (the bottom plate 91a of the positive electrode outer casing 91) in the stacking direction. The size of the through hole 71 is not particularly limited and can be appropriately set according to the purpose. For example, the size of the through hole 71 can be 0.05 mm to 1.0 mm. The shape of the through hole 71 is not particularly limited, and is typically circular.

[0103] The metal portion 72 is a portion that is in direct contact with and electrically connected to the end portion 24 of the connection portion 22 inside the outer casing 90. Air tightness and gas barrier properties are ensured by connecting the metal portion 72 to the end portion 24 of the connection portion 22 inside the outer casing 90. The metal constituting the metal portion 72 is not particularly limited. For example, copper, gold, silver, nickel, chromium, etc. can be cited. The metal portion 72 can also be arranged only in the through hole 71, but from the viewpoint of improving connectivity, it can also be arranged in addition to being arranged inside the through hole 71, and also arranged on the inner surface peripheral portion and the outer surface peripheral portion of the outer casing 90 (the bottom plate 91a of the positive electrode outer casing 91) that is continuous from the through hole 71.

[0104] It should be noted that, from the perspective of improving structural efficiency, the metal portion 72 and the end portion 24 of the connecting portion 22 are directly in contact and electrically connected inside the outer casing 90, but the present invention is not limited to this method. The metal portion 72 and the end portion 24 of the connecting portion 22 may also be indirectly electrically connected inside the outer casing 90 via a conductive component or the like.

[0105] The insulating layer 73 has a function of insulating the metal part 72 from the outer casing 90 (positive electrode outer casing 91). The insulating layer 73 is arranged between the outer casing 90 (positive electrode outer casing 91) and the metal part 72. In the case where the metal part 72 is arranged only inside the through hole 71, the insulating layer 73 may be provided only on the inner side of the through hole 71. In the case where the metal part 72 is arranged inside the through hole 71 and on the inner and outer peripheral parts of the outer casing 90 (bottom plate 91a of the positive electrode outer casing 91) which is continuous from the through hole 71, the insulating layer 73 may be arranged on the inner side of the through hole 71 and on the inner and outer peripheral parts of the outer casing 90 which is continuous from the through hole 71. Typically, as described above, the insulating layer 95 is arranged on the bottom plate 91a of the positive electrode outer casing 91 at a portion other than the positive electrode terminal 61. Therefore, typically, the insulating layer 73 constitutes a part of the insulating layer 95 , and is disposed inside the through hole 71 and inside and outside peripheral portions of the exterior body 90 that are continuous from the through hole 71 .

[0106] The material of the insulating layer 73 is not particularly limited, and examples thereof include polyimide, polypropylene, polyethylene, polyvinyl chloride, and polytetrafluoroethylene.

[0107] The method of providing the connection terminal 70 on the exterior body 90 is not particularly limited, and examples thereof include the following methods. Fig.10 An example of a method of providing the connection terminal 70 on the exterior body 90 is shown. Fig.10 : is a cross-sectional view of the positive electrode outer casing 91. First, a through hole 71 is provided at a predetermined position of the bottom plate 91a of the positive electrode outer casing 91. Next, a portion of the bottom plate 91a that becomes the positive electrode terminal 61 is covered with a predetermined shielding member M, and an insulating layer is provided for the other portion. Then, a metal portion 72 is provided for the through hole 71 provided with the insulating layer 73. The method of providing the metal portion 72 can be, for example, electroplating.

[0108] In the battery 100, inside the outer casing 90, the end face positive electrode collector 11 is electrically connected to the positive electrode terminal 61, the end face negative electrode collector 12 is electrically connected to the negative electrode terminal 62, and the connecting portion 22 is electrically connected to the connecting terminal 70. Therefore, the airtightness and gas barrier properties of the battery 100 are improved. In addition, in the battery 100, the end face electrode terminal and the connecting terminal are arranged on the same surface. Therefore, the battery 100 has an improved structural efficiency for the same reason as the electrode stack 50.

[0109] <Connection member 500>

[0110] Next, the connection component 500 is described. The connection component 500 includes a first terminal connection portion, a second terminal connection portion, and a connection terminal connection portion 400. Hereinafter, a method of using the first terminal connection portion as the positive terminal connection portion 200 and the second terminal connection portion as the negative terminal connection portion 300 is described. However, the first terminal connection portion may also be a negative terminal connection portion, and the second terminal connection portion may also be a positive terminal connection portion. However, the first terminal connection portion and the second terminal connection portion are set to be connected to different poles, respectively.

[0111] like Figure 1 , Figure 2 As shown, the connection member 500 includes a positive electrode terminal connection portion 200, a negative electrode terminal connection portion 300, and a connection terminal connection portion 400. In the battery pack structure 1000, the positive electrode terminal connection portion 200 and the connection terminal connection portion 400 are integrated.

[0112] Fig.11 A bottom view showing the positive electrode terminal connecting portion 200 and the connecting terminal connecting portion 400 is shown. Fig.12 A plan view of the negative electrode terminal connecting portion 300 is shown.

[0113] (Positive terminal connection portion 200, negative terminal connection portion 300)

[0114] The positive terminal connection part 200 is a sheet-like component. Figure 2 , Fig.11 As shown, the positive 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 terminal 61 of each battery 100. The positive terminal connection part 200 includes a first substrate layer 220 that supports the first metal layer 210. The positive terminal connection part 200 includes a first insulating layer 230 on the surface of the first metal layer 210 on the side opposite to the first substrate layer 220 and around the portion in contact with the positive terminal 61.

[0115] In addition, the positive terminal connection part 200 includes a first positioning part 240 for guiding the installation position of the battery 100. The first positioning part 240 is made of resin and is formed in a manner protruding on the first insulating layer 230. The first positioning part 240 is configured to surround at least a portion of the periphery of each positive terminal 61. Fig.11 In the embodiment, the first positioning portion 240 is formed in a U-shape when viewed from above to surround each positive electrode terminal 61. By providing the first positioning portion 240, the battery 100 can be set at an appropriate position, and the first metal layer 210 can reliably contact the positive electrode terminal 61 and the terminals of the terminal connection portion 400 can reliably contact each connection terminal 70.

[0116] The structure of the negative terminal connection part 300 is also the same. That is, the negative terminal connection part 300 is a sheet-shaped component. The negative terminal connection part 300 includes a second metal layer 310, and the second metal layer 310 is directly in contact with and electrically connected to the negative terminal 62 of each battery 100. The negative terminal connection part 300 includes a second base layer 320 that supports the second metal layer 310. The negative terminal connection part 300 includes a second insulating layer 330 on the surface of the second metal layer 310 on the side opposite to the second base layer 320 and around the portion in contact with the negative terminal 62.

[0117] In addition, the negative 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 formed on the second insulating layer 330. The second positioning portion 340 is configured to surround at least a portion of the periphery of each negative terminal 62. Fig.12 In the embodiment, the second positioning portion 340 is formed in a U-shape in a plan view to surround each negative electrode terminal 62. By providing the second positioning portion 340, the battery 100 can be set at an appropriate position, and the second metal layer 310 and the negative electrode terminal 62 can be reliably contacted.

[0118] The metal constituting the first metal layer 210 and the second metal layer 310 is not particularly limited, and examples thereof include gold, silver, copper, aluminum, nickel, iron, and alloys thereof. The first substrate layer 220, the second substrate 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, and epoxy resin.

[0119] The size of the positive terminal connection part 200 and the negative terminal connection part 300 is not limited as long as it can be sandwiched by the battery 100. Compared with the battery 100, it is not necessary to be extremely large, so, for example, it can be set to a size of 0.1 to 5.0 mm from the end of the battery 100. In the case where terminals are provided at the ends of the positive terminal connection part 200 and the negative terminal connection part 300, the length in the long side direction can also be increased as needed.

[0120] The thickness of the positive terminal connection part 200 (excluding the first positioning part 240 ) and the negative terminal connection part 300 (excluding the second positioning part 340 ) may be appropriately set in consideration of the balance between the required flexibility and strength, for example, 0.005 mm to 1 mm.

[0121] As a method for bringing the battery 100 into contact with the positive terminal connection part 200 and the negative terminal connection part 300, shrink film, restraint tape, adhesive, ultrasonic welding, laser welding, electric welding, etc. can be used. Alternatively, plates or the like can be sandwiched and fixed from the outside in the thickness direction. Alternatively, springs or the like can be used to bring them into contact.

[0122] As described above, the positive electrode terminal 61 of each battery 100 is electrically connected to the positive electrode terminal connection portion 200 (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 (second metal layer 310 ). Thus, the batteries 100 are connected in parallel.

[0123] Regarding the structures of the positive electrode terminal connecting portion 200 and the negative electrode terminal connecting portion 300 , reference can be made to Japanese Patent Application No. 2023-065874.

[0124] <Connection Terminal Connection Portion 400>

[0125] The connection terminal connection part 400 is a sheet-shaped component having a plurality of terminals, and each connection member is electrically connected to each connection terminal 70a~70h of each battery 100. The plurality of terminals are divided according to each battery 100 to be connected, and a group of the divided terminals is referred to as a terminal group 410~430. The terminal group 410 has terminals 411a~411h, the terminal group 420 has terminals 421a~421h, and the terminal group 430 has terminals 431a~431h. In addition, the connection terminal connection part 400 has a substrate 450 supporting a plurality of terminals, and the substrate 450 includes a plurality of terminal wirings 440a~440h inside. In addition, the connection terminal connection part 400 has a connector protrusion 460 for collecting the terminal wirings 440a~440h and connecting them to the outside.

[0126] Fig.13A , Fig. 13B A cross-sectional view focusing on the terminal group 410 is shown. Fig.13A The cross section where the terminal 411 a and the terminal wiring 412 a are connected is shown. Fig. 13B The cross section where the terminal 411b and the terminal wiring 412b are connected is shown.

[0127] from Fig.13A , Fig. 13B It can be understood that each terminal 411a~411h is in contact with each terminal wiring 440a~440h in a one-to-one relationship and is electrically connected. The reason for forming such a structure is that the connection terminal connection part 400 is a two-layer structure consisting of a substrate 450 and a plurality of terminals. In addition, since each terminal 411a~411h is connected to each connection terminal 70a~70h of the battery 100, the battery information (voltage, current, etc.) of the electrode stack 50 can be obtained from the terminal wiring 440a~440h.

[0128] The terminal groups 420 and 430 are also similarly connected to the connection terminals 70a~70h of each battery 100. On the other hand, the terminal groups 420 and 430 are connected to the same terminal wiring 440a~440h as the terminal group 410. That is, the terminal wiring 440a~440h is shared by the terminal groups 410~430, and each terminal group 410~430 is 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 is true for the terminal wiring 440c~440h. In this way, the corresponding terminals of each terminal group 410~430 are connected in parallel to one terminal wiring. As a result, the number of terminal wirings can be reduced and the structure can be simplified.

[0129] However, the battery pack structure 1000 is not limited to this method. That is, the terminal wiring may not be connected in parallel as described above, and only one terminal may be connected to one terminal wiring. In this way, battery information can be obtained from each terminal. Therefore, the terminal wiring only needs to be electrically connected to at least one terminal.

[0130] (Structural Features of Positive Terminal Connecting Part 200 and Connecting Terminal Connecting Part 400)

[0131] The positive terminal connection part 200 and the connection terminal connection part 400 are arranged on the surface of the battery 100 on which the positive terminal 61 and the connection terminal 70 are arranged. That is, the positive terminal connection part 200 and the connection terminal connection part 400 are arranged on the same surface. In the past, as in the bipolar battery described in Japanese Patent Laid-Open No. 2006-127857, the connection terminal providing battery information was led out from the side of the battery, and the connection terminal connection part was arranged on the side. In contrast, in the battery pack structure 1000, the positive terminal connection part 200 and the connection terminal connection part 400 are arranged on the same surface. As a result, expansion in the lateral direction is suppressed. Therefore, according to the battery pack structure 1000, the structural efficiency can be improved.

[0132] In addition, in the battery pack structure 1000, the connection terminal connection part 400 arranged on the same surface as the positive terminal connection part 200 is arranged with respect to the battery 100 having the connection terminal 70 arranged on the same surface as the positive terminal 61, so that these components are electrically connected only by providing the positive terminal connection part 200 and the connection terminal connection part 400 with respect to the battery 100. Therefore, the battery pack structure 1000 does not require complicated connection work, which also contributes to reducing manufacturing costs.

[0133] Furthermore, the positive electrode terminal connection part 200 and the connection terminal connection part 400 are integrated, thereby facilitating handling. However, the positive electrode terminal connection part 200 and the connection terminal connection part 400 may be separate components.

[0134] (Flexibility of the connecting member 500)

[0135] The positive terminal connection part 200, the negative terminal connection part 300 and the connection terminal connection part 400 are all sheet-like parts and have flexibility. In particular, the portion between the adjacent batteries 100 in the long side direction in the positive terminal connection part 200, the negative terminal connection part 300 and the connection terminal connection part 400 has flexibility. Therefore, the battery pack structure 1000 can be not only in the form of arranging the batteries 100 on a plane, but also in various forms. For example, Fig.14As shown, the battery 100 may be stacked in a zigzag manner. In this case, the battery pack structure may be constrained by constraining members such as metal bands so that each terminal is in contact with the metal layer.

[0136] (Other forms related to positioning)

[0137] Regarding the positioning of the battery 100, a connection member having another form will be described. The other form is a form in which the installation position of the battery 100 can be guided by the cutout. Fig.15 A bottom view of a positive electrode terminal connecting portion 1200 and a connecting terminal connecting portion 1400 as another embodiment is shown. Fig.16 FIG. 2 shows a top view of another embodiment of a negative electrode terminal connection portion 1300. Fig.16 In FIG. 1 , each battery 100 arranged as a reference is indicated by a dotted line.

[0138] like Fig.15 As shown, the positive terminal connection part 1200 has almost the same structure as the positive terminal connection part 200, but is different in that a first notch 1240 is provided instead of the first positioning part 240. The connection terminal connection part 1400 further includes a third notch 1470 on the basis of the structure of the connection terminal connection part 400. The first notch 1240 is formed in the positive terminal connection part 1200 at a portion (first connecting portion) between the batteries 100 adjacent in the long side direction and at an end portion on the opposite side of the connection terminal connection part 1400 in the short side direction. The third notch 1470 is formed in the connection terminal connection part 1400 at a position corresponding to the above-mentioned first connecting portion in the long side direction and at an end portion on the opposite side of the positive terminal connection part 1200 in the short side direction. Therefore, the first notch 1240 and the third notch 1470 are formed facing each other.

[0139] The positive terminal connection part 1200 and the connecting terminal connection part 1400 have a first incision 1240 and a third incision 1470, whereby these incisions serve as marks, enabling each battery 100 to be set at an appropriate position, and enabling reliable contact between the first metal layer 210 and the positive terminal 61 and between each terminal of the connecting terminal connection part 400 and each connecting terminal 70. In addition, the long-side edges of the positive terminal connection part 1200 and the connecting terminal connection part 1400 are aligned with the long-side edges of each battery 100, and a first cutout 1240 and a third cutout 1470 are arranged between each battery 100 arranged along the long-side direction (when no terminal for external connection is arranged at the end of the long-side direction of the positive terminal connection part 1200, the short-side edges of the positive terminal connection part 1200 and the connecting terminal connection part 1400 at the end are aligned with one of the short-side edges of the battery 100 arranged at the end), thereby making it easier to position each battery 100 through the outer periphery of the positive terminal connection part 1200 and the connecting terminal connection part 1400, the first cutout 1240 and the third cutout 1470. In this case, the size of each battery 100 can be increased (or the size of the positive terminal connection part 1200 and the connection terminal connection part 1400 can be reduced) compared to the case of using the positive terminal connection part 200 and the connection terminal connection part 400 .

[0140] like Fig.16 As shown, the negative terminal connection part 1300 has almost the same structure as the negative terminal connection part 300, but is different in that a second notch 1340 is provided instead of the second positioning part 340. The second notch 1340 is formed in the negative terminal connection part 1300 at the portion (second connecting portion) between the batteries 100 adjacent in the long side direction and at both ends in the short side direction.

[0141] The effect of the negative terminal connection part 1300 is the same as that of the positive terminal connection part 1200 and the connection terminal connection part 1400. Fig.16 , the following is shown: the long side of the negative terminal connection portion 1300 is aligned with the long side of each battery 100, and a second cutout 1340 is arranged between each battery 100 arranged along the long side. Fig.16 In the embodiment, since no terminal for external connection is arranged at one end of the long side of the negative terminal connection part 1300, the side of the short side of the negative terminal connection part 1300 at the end is made to coincide with one side of the short side of the battery 100 arranged at the end. Fig.16 As shown, the negative electrode terminal connection part 1300 can increase the size of each battery 100 (or reduce the size of the negative electrode terminal connection part 1300 ) compared to the case where the negative electrode terminal connection part 300 is used.

[0142] As described above, according to other forms of connecting members, the size of each battery 100 can be increased (or the size of the connecting member can be reduced), and the structural efficiency of the battery pack structure can be further improved.

[0143] The battery pack structure of the present disclosure has been described above by showing one embodiment. According to the battery pack structure of the present disclosure, structural efficiency can be improved.

[0144] [Battery Pack Composite Structure 2000]

[0145] Next, the battery pack composite structure of the present disclosure will be described using a battery pack composite structure 2000 as one embodiment.

[0146] Fig.17 2000 is a top view of the battery pack composite structure. Fig.17 As shown, the battery pack composite structure 2000 includes a plurality of battery pack structures 1000 and a connecting member 1100 for connecting the plurality of battery pack structures 1000. The battery pack structures 1000 have been described above, and therefore, description thereof will be omitted here.

[0147] <Connecting member 1100>

[0148] Fig.18 The top view of only the connecting component 1100 is shown. The connecting component 1100 has a plurality of connecting terminals, and each connecting terminal is electrically connected to each terminal of each battery pack structure 1000 by wiring 440a~440h. The plurality of connecting terminals are divided according to each battery pack structure 1000 to be connected, and the divided group of terminals is used as the connecting terminal group 1110, 1120. The connecting component 1100 has connector recesses 1130, 1140 for accommodating each connecting terminal group 1110, 1120, and each connector recess 1130, 1140 is connected to each connector protrusion 460 of the battery pack structure 1000. As a result, each connecting terminal included in each connecting terminal group 1110, 1120 is connected to each terminal of each battery pack structure 1000 by wiring 440a~440h. The connection member 1100 includes a substrate 1160 that includes a plurality of connection terminal wires 1150a to 1150h therein, and a connector 1170 that collects the connection terminal wires 1150a to 1150h and connects them to the outside.

[0149] Each connection terminal included in the connection terminal group 1110 is in contact with and electrically connected to each connection terminal wiring 1150a to 1150h of the battery pack structure 1000 in a one-to-one relationship. Therefore, battery information (voltage, current, etc.) of the electrode stack 50 included in the battery pack structure 1000 can be obtained from the connection terminal wiring 1150a to 1150h.

[0150] Similarly, the connection terminal group 1120 includes each connection terminal in contact with each connection terminal wiring 1150a~1150h of another battery pack structure 1000 in a one-to-one relationship and is electrically connected. On the other hand, the connection terminal group 1120 is connected to the same connection terminal wiring 1150a~1150h as the connection terminal group 1110. That is, the connection terminal wiring 1150a~1150h is shared by the connection terminal groups 1110 and 1120, and each connection terminal group 1110~1120 is connected in parallel. This is the same as the connection relationship between each terminal group 410~430 and each terminal wiring 440a~440c in the battery pack structure 1000. Therefore, the corresponding connection terminals of each connection terminal group 1110~1120 are connected in parallel to one connection terminal wiring. This can reduce the number of connection terminal wirings and simplify the structure.

[0151] However, the battery pack composite structure 2000 is not limited to this method. That is, the wiring for connecting terminals may not be connected in parallel as described above, and only one connecting terminal may be connected to one wiring for connecting terminals. In this way, battery information can be obtained from each connecting terminal. Therefore, the wiring for connecting terminals only needs to be electrically connected to at least one connecting terminal.

[0152] like Fig.15 As shown, in the battery pack composite structure 2000, the connection terminal connection portion 400 of each battery pack structure 1000 and the connecting member 1100 are arranged on the same surface, which helps to improve the structural efficiency. In addition, in the battery pack composite structure 2000, each battery pack structure 1000 and the connecting member 1100 can be easily connected by simply connecting the connector protrusion 460 of each battery pack structure 1000 and the connector recesses 1130 and 1140 of the connecting member 1100.

[0153] It should be noted that, in the battery pack composite structure 2000 , the connecting member 1100 is a separate member from the connecting terminal connecting portion 400 of the battery pack structure, but the present invention is not limited to this embodiment, and they may be integrated.

[0154] The connecting member 1100 is a sheet-like member and has flexibility, similar to the positive terminal connection part 200, the negative terminal connection part 300, and the connection terminal connection part 400 of each battery pack structure 1000. Specifically, the substrate 1160 (including the connection terminal wiring 1140a~1140h) of the connecting member 1100 has flexibility. Therefore, the battery pack composite structure 2000 can be not only in the form of arranging the battery pack structures 1000, but also in various forms.

[0155] The above is an explanation of the battery pack composite structure of the present disclosure by showing one embodiment. According to the battery pack composite structure of the present disclosure, since it is provided with the above-mentioned battery pack structure, the structural efficiency can be improved. In addition, according to the battery pack composite structure, the above-mentioned battery pack structures can be easily connected.

[0156] [Battery structure, battery composite structure]

[0157] The battery pack structure of the present disclosure has multiple batteries, but it can be a method of having only one battery. That is, the present disclosure can provide a battery structure. In addition, the present disclosure can provide a battery composite structure having multiple battery structures. The battery structure and the battery composite structure are described below. The details of each component are as described above.

[0158] The battery structure disclosed in the present invention comprises a battery and a connecting component connected to the battery, the battery comprising a first terminal arranged on one surface in the thickness direction, a second terminal arranged on another surface in the thickness direction, and a plurality of connecting terminals arranged on the same surface as the first terminal, the connecting component comprising a first terminal connecting portion, a second terminal connecting portion, and a connecting terminal connecting portion, the first terminal connecting portion comprising a first metal layer, the first metal layer being electrically connected to the first terminal of the battery, the second terminal connecting portion comprising a second metal layer, the second metal layer being electrically connected to the second terminal of the battery, the connecting terminal connecting portion comprising a plurality of terminals, each terminal being electrically connected to each connecting terminal of the battery, and the first terminal connecting portion and the connecting terminal connecting portion being arranged on the same surface.

[0159] The battery composite structure of the present disclosure comprises a plurality of the above-mentioned battery structures and a connecting member for connecting the plurality of battery structures, wherein the connecting member has a plurality of connecting terminals, and each connecting terminal is electrically connected to each terminal of the battery structure by wiring.

Claims

1. A battery pack structure, comprising a plurality of batteries and a connecting member connected to the plurality of batteries, wherein: The battery 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. 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, and the first metal layer is electrically connected to the first terminal of each of the batteries. The second terminal connection portion includes a second metal layer, and the second metal layer is electrically connected to the second terminal of each of the batteries. The connection terminal connection portion includes a plurality of terminals, each of which is electrically connected to each of the connection terminals of each of the batteries. The first terminal connection portion and the connection terminal connection portion are arranged on the same surface.

2. The battery pack structure according to claim 1, wherein: The connection terminal connection portion includes 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.

3. The battery pack structure according to claim 1, wherein: The plurality of terminals are divided according to each of the batteries, When the divided group of terminals is used as a terminal group, The corresponding terminals of each of the terminal groups are connected in parallel to one of the terminal wirings.

4. The battery pack structure according to claim 1, wherein: The first terminal connection portion and the connection terminal connection portion are integrated.

5. The battery pack structure according to claim 1, wherein: The first terminal connection portion, the second terminal connection portion, and the connection terminal connection portion have flexibility.

6. A battery pack composite structure, comprising a plurality of battery pack structures according to any one of claims 1 to 5 and a connecting member for connecting the plurality of battery pack structures, wherein: The connecting member includes a plurality of connecting terminals, each of which is electrically connected to each of the terminals of each of the battery pack structures by wiring.

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