BATTERY

Abstract

In a battery comprising an electrode layer body inside an outer packaging body, wherein: a positive electrode current collector is arranged at one end of the electrode layer body in the layer direction; a negative electrode current collector is arranged at the other end of the electrode layer body in the layer direction; an internal current collector is layered inside the electrode layer body; the internal current collector has a projected connection section on a side face of the electrode layer body; a positive electrode terminal is arranged at one surface of the outer packaging body in the layer direction; a negative electrode terminal is arranged at the other surface of the outer packaging body in the layer direction;a connecting terminal is arranged on the same surface as the surface on which at least one of the positive electrode terminal and negative electrode terminal is arranged; and inside the outer packaging body, the end-side positive electrode current collector and the positive electrode terminal are electrically connected, the end-side negative electrode current collector and the negative electrode terminal are electrically connected, and the connecting section and the connecting terminal are electrically connected.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

[0001] The present application concerns a battery. 2. Description of the related art

[0002] Japanese Unpublished Patent Application No. 2019-53845 (JP 2019-53845 A) discloses a current collection plate arrangement structure for a bipolar battery in which a voltage monitoring terminal (current collection plate) extends along a layering direction between an outer surface of a sidewall sealing material or a battery cell laminate and the sidewall sealing material, and an end portion of the voltage monitoring terminal is disposed on an upper surface of a topwall sealing material. JP 2019-53845 A describes that the occupancy area of ​​the voltage monitoring terminal on a cell side surface can be reduced because the voltage monitoring terminal is disposed on the upper surface of the topwall sealing material. SUMMARY OF THE INVENTION

[0003] However, in the structure of the current collection plate in JP 2019-53845 A, a through-hole is provided on an outer packaging member, and an electrode and the voltage monitoring terminal are drawn outward from the through-hole. Therefore, there is room for improvement in improving airtightness and gas barrier properties.

[0004] In view of the above, a main object of the present disclosure is to provide a battery that enables airtightness and gas barrier properties to be improved and structural efficiency to be increased.

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

[0006] A first aspect is a battery comprising an electrode laminated body inside an outer packaging body, wherein: an end positive electrode current collector is arranged on one surface of the electrode laminated body in the layering direction; an end negative electrode current collector is arranged on the other surface of the electrode laminated body in the layering direction; an internal current collector is layered inside the electrode laminated body; the internal current collector has a drawn-out connection portion on a side surface of the electrode laminated body; a positive electrode terminal is arranged on one surface of the outer packaging body in the layering direction; a negative electrode terminal is arranged on the other surface of the outer packaging body in the layering direction;a connection terminal is arranged on the same surface as the surface on which at least one of the positive electrode terminal and the negative electrode terminal is arranged; and inside the outer packaging body, the end-side positive electrode current collector and the positive electrode terminal are electrically connected, the end-side negative electrode current collector and the negative electrode terminal are electrically connected, and the connection portion and the connection terminal are electrically connected.

[0007] A second aspect is the battery according to the first aspect, wherein: the outer packaging body is made of metal; and the connection terminal has a through-hole extending in the layering direction through an end surface of the outer packaging body, a metal portion disposed in the through-hole, and an insulating layer disposed between the through-hole and the metal portion.

[0008] A third aspect is the battery according to the second aspect, wherein the insulating layer is arranged at an inside portion of the through-hole or at an inner peripheral portion and outer peripheral portion of the outer packaging body adjacent to the through-hole.

[0009] A fourth aspect is the battery according to any one of the first to third aspects, wherein, inside the outer packaging body, the end positive current collector and the positive electrode terminal are in direct contact with each other, the end negative current collector and the negative electrode terminal are in direct contact with each other, and the connecting portion and the connecting terminal are in direct contact with each other.

[0010] With the battery in the present disclosure, it is possible to improve airtightness and gas barrier properties and increase structural efficiency. BRIEF DESCRIPTION OF THE CHARACTERS

[0011] Features, advantages and technical and industrial significance of exemplary embodiments of the invention are described below with reference to the accompanying figures, in which like symbols denote like elements and in which: Fig. 1 is a plan view of a battery 100; Fig. 2A is a sectional view of the battery 100 from II-II in Fig. 1 out; Fig. 2B is an exploded sectional view of the battery 100; Fig. 3 is a plan view of an electrode layer body 50; Fig. 4A is a plan view of the electrode layer body 50 from the A direction in Fig. 3 seen; Fig. Fig. 4B is a side view of the electrode layer body 50 from the B direction in Fig. 3 seen; Fig. 5A is a plan view of an internal current collector 20; Fig. 5B is a diagram showing a plurality of internal current collectors 20 for describing differences in the position and length of a connecting portion 22; Fig. 6 is a sectional view of the electrode laminated body 50 showing an example; Fig. 7 is a partial sectional view with focus on a connection terminal 70; and Fig. 8 shows an example of a method for providing the connection terminal 70 to an outer packaging body 90. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] A battery in the present disclosure is described using a battery 100, which is one embodiment.

[0013] Fig. 1 shows a top view of the battery 100. Fig. 2A is a sectional view of the battery 100 from II-II in Fig. 1, and Fig. 2B shows an exploded cross-sectional view of the battery 100. As in Fig. 1, Fig. 2A and Fig. 2B, the battery 100 includes an electrode layer body 50 and an outer packaging body 90, wherein the electrode layer body 50 is located inside the outer packaging body 90. Electrode layer body 50

[0014] First, the electrode layer body 50 is described. Fig. 3 shows a plan view of the electrode layer body 50. Fig. 4A is a plan view of the electrode layer body 50 from the A direction in Fig. 3, and Fig. Fig. 4B is a side view of the electrode layer body 50 from the B direction in Fig. 3.

[0015] The electrode laminated body 50 is a laminated body having a rectangular shape in the layering direction and including current collectors (a positive electrode current collector and a negative electrode current collector), a positive electrode layer, a negative electrode layer, and an electrolyte layer. In the electrode laminated body 50, the number of laminated layers is not particularly limited and can be appropriately determined depending on the purpose. The lamination form of the electrode laminated body 50 is not particularly limited and can be a monopolar or bipolar model. The electrode laminated body 50 can be a liquid battery or an all-solid-state battery. The electrode laminated body 50 can be a lithium-ion battery, a sodium-ion battery, a nickel-hydrogen battery, or the like. The electrode laminated body 50 can be a primary battery or a secondary battery. Material of electrode layer body 50

[0016] The materials of the respective layers constituting the electrode laminated body 50 will be described using typical examples. However, the materials of the respective layers constituting the electrode laminated body 50 are not limited to the typical examples.

[0017] The current collector is a plate-shaped conductive element. Examples of the current collector include a metal foil made of stainless steel, iron, copper, aluminum, titanium, nickel, or the like. The metal foil may be made of an alloy containing two or more of these metals. Furthermore, the metal foil may be subjected to a certain surface treatment, such as plating. The current collector may be composed of a plurality of metal foils. In this case, the metal foils may be bonded together by an adhesive or the like, or by pressing or the like. The shape of the current collector may be rectangular. The thickness of the current collector is not particularly limited and is, for example, 1 μm to 1 mm.

[0018] The positive electrode layer contains at least one positive electrode active material. The positive electrode active material is not particularly limited, and any material can be appropriately selected depending on the intended battery performance. For example, there are mixed oxides, metallic lithium, sulfur, and the like. For example, the composition of the mixed oxide contains at least one of iron, manganese, titanium, nickel, cobalt, aluminum, and lithium. Examples of the mixed oxide include olivine lithium iron phosphate (LiFePO4).

[0019] The positive electrode layer can contain any conductive agent. There are no particular limitations on the conductive agent, and any material can be appropriately selected depending on the intended battery performance. For example, there are carbon materials such as acetylene black, carbon black, and graphite.

[0020] The positive electrode layer can contain any binder. There are no particular limitations on the binder, and any material can be appropriately selected depending on the intended battery performance. For example, there are rubber resins, fluoride resins, and the like.

[0021] The positive electrode layer can contain any solid electrolyte. There are no particular limitations on the solid electrolyte, and any material can be appropriately selected depending on the intended battery performance. For example, there are solid electrolytes, solid sulfide electrolytes, and the like.

[0022] The positive electrode layer may be rectangular. The thickness of the positive electrode layer is not particularly limited and ranges, for example, from 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 can be appropriately determined depending on the intended battery performance. The positive electrode layer may also contain materials other than those listed above.

[0023] The negative electrode layer contains a negative electrode active material. The negative electrode active material is not particularly limited, and any material can be appropriately selected depending on the intended battery performance. For example, there are carbon materials such as black lead, artificial black lead, hard carbon, and soft carbon; a metallic compound; an element that can be alloyed with lithium; a compound of an element that can be alloyed with lithium; and the like. Examples of elements that can be alloyed with lithium include silicon and tin.

[0024] The negative electrode layer can contain any conductive aid. The conductive aid is not particularly limited, and any material can be appropriately selected depending on the intended battery performance. For example, a conductive aid that can be applied to the positive electrode layer can be appropriately selected.

[0025] The negative electrode layer can contain any binder. The binder is not particularly limited, and any material can be appropriately selected depending on the intended battery performance. For example, a binder that can be applied to the positive electrode layer can be appropriately selected.

[0026] The negative electrode layer can contain any solid electrolyte. There are no particular limitations on the solid electrolyte, and any material can be appropriately selected depending on the intended battery performance. For example, a solid electrolyte that can be applied to the positive electrode layer can be appropriately selected.

[0027] The negative electrode layer may be rectangular. The thickness of the negative electrode layer is not particularly limited and ranges, for example, from 1 μm to 1 mm. From the perspective of performance improvement, 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 can be appropriately determined depending on the intended battery performance. The negative electrode layer may also contain materials other than those mentioned above.

[0028] In the case of a liquid electrolyte layer, the electrolyte layer contains a separator and an electrolyte solution. The separator is mainly a porous polyolefin film. The electrolyte solution is a solution in which a supporting electrolyte is dissolved in a non-aqueous solvent. Examples of non-aqueous solvents include carbonate solvents, ether solvents, ester solvents, and the like. Examples of supporting electrolytes include LiPF6, LiBF4, lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethane)sulfonimide (LiTFSI), and the like.

[0029] If the electrolyte layer is a solid electrolyte layer, the electrolyte layer contains a solid electrolyte. Furthermore, the solid electrolyte layer may contain a binder. The solid electrolyte and the binder can be suitably selected from the solid electrolytes and binders described above.

[0030] The electrolyte layer can be rectangular. The thickness of the electrolyte layer is not particularly limited and is, for example, in a range of 1 µm to 1 mm. End-side positive electrode current collector 11, end-side negative electrode current collector 12, internal current collector 20

[0031] As in Fig. 3, Fig. 4A and Fig. 4B, the electrode laminated body 50 includes a positive electrode current collector (also referred to as an “end positive electrode current collector 11” in the present description) arranged on one surface in the layering direction, and a negative electrode current collector (also referred to as an “end negative electrode current collector 12” in the present description) arranged on the other surface. Furthermore, the electrode laminated body 50 includes current collectors (also referred to as “internal current collectors 20” in the present description) inside. Layers other than the end positive electrode current collector 11, the end negative electrode current collector 12, and the internal current collectors 20 vary depending on the intended battery and are therefore in Fig. 4B not specifically shown.

[0032] The number of internal current collectors 20 is not particularly limited and can be appropriately determined according to the purpose. Fig. 3, Fig. 4A and Fig. 4B, a plurality of internal current collectors 20 (eight internal current collectors 20) are arranged inside the electrode layer body 50. The internal current collectors 20 may be positive electrode current collectors or negative electrode current collectors. Furthermore, the internal current collectors 20 may be the same type of current collector or different types of current collectors. The internal current collectors 20 play a role in providing information about the battery to the outside, as described later, and therefore, all the internal current collectors 20 may be composed of an identical type of current collector (preferably positive electrode current collectors). In addition, the electrode layer body 50 may also include an ordinary current collector inside that is not part of the internal current collectors 20.

[0033] A characteristic of the internal current collector 20 is that, in contrast to the other current collectors, it has a connecting section 22 which is drawn out from a side surface of the electrode layer body 50. Fig. 5A shows a top view of the internal current collector 20, and Fig. 5B shows a plurality of internal current collectors 20 for describing differences in the position of the connecting portion 22.

[0034] As in Fig. As shown in Figure 5A, the internal current collector 20 includes a main body portion 21 and a connecting portion 22. The main body portion 21 is a portion laminated inside the electrode layer body 50 and functions as a current collector. Accordingly, the positive electrode layer or negative electrode layer is laminated on the main body portion 21. The main body portion 21 has a rectangular shape. The connecting portion 22, on the other hand, is a portion that transmits battery information (information about voltage, current, and the like) to the outside and has the shape of an elongated belt. The connecting portion 22 is used, for example, as a voltage monitoring line. As shown in Fig. 3, Fig. 4A and Fig. As shown in FIG. 4B, the connecting portion 22 is formed by being drawn out from a side surface 50a of the electrode laminated body 50, and the drawn-out connecting portion 22 is folded in the lamination direction. Furthermore, an end portion of the connecting portion 22 is further folded and disposed on the same surface as the end-side positive electrode current collector 11. Thus, the connecting portion 22 is characterized in that the connecting portion 22 extends along the side surface 50a of the electrode laminated body 50 in the lamination direction and is disposed on the same surface as the surface on which the end-side positive electrode current collector 11 is disposed.

[0035] In this way, the connecting portion 22 is characterized in that the connecting portion 22 extends along the side surface of the electrode laminated body 50 in the laminated direction and is arranged on the same area as the area on which the end positive electrode current collector 11 is arranged. Conventional batteries have a shape in which the connecting portion, which functions as a voltage monitoring line, is extended only toward the side surface. In the battery 100, however, the connecting portion 22 has a portion extending along the side surface of the electrode laminated body 50 in the laminated direction, and thereby it is possible to reduce the area of ​​the connecting portion 22 on the entire battery 100.Furthermore, JP 2019-53845 A requires an outer packaging member with a through-hole through which the voltage monitoring terminal is led out, and the structure of the outer packaging member is limited. In the battery 100, however, the connecting portion 22 is arranged on the same surface as the end positive electrode current collector 11, which can improve structural efficiency with a simple structure.

[0036] In the connecting portion 22, a portion drawn out from the side surface of the electrode laminated body 50 and extending along the side surface 50a in the laminated direction is referred to as an extension portion 23, and a portion disposed on the identical surface as the surface on which the end positive electrode current collector 11 is disposed is referred to as an end portion 24.

[0037] As in Fig. 5B, the position of the connecting portion 22 in the internal current collector 20 is not particularly limited, but as shown in Fig. 3, Fig. 4A and Fig. As shown in Figure 4B, the connecting portions 22 drawn out from the plurality of internal current collectors 20 can be arranged so that they do not overlap when viewed in the lamination direction. This makes it possible to limit the contact between the connecting portions 22 and simplify the structure of the battery. As shown in Fig. 5B, the length of the connecting portion 22 can be arbitrarily adjusted depending on the position of the end portion 24.

[0038] Here, it is further described that “the connecting portion 22 is arranged on the same surface as the end positive electrode current collector 11.” As in Fig. 3, Fig. 4A and Fig. As shown in FIG. 4B, the end portion 24 of the connecting portion 22 is disposed on the end positive electrode current collector 11 through an end insulating layer 30. Strictly speaking, the end portion 24 of the connecting portion 22 is not disposed on the same surface as the surface on which the end positive electrode current collector 11 is disposed. However, the end insulating layer 30 is a very thin layer, so it can be said that the end portion 24 of the connecting portion 22 and the end positive electrode current collector 11 are disposed on the same surface from the standpoint of use.Accordingly, “the connecting portion 22 is arranged on the same surface as the end positive electrode current collector 11” does not necessarily mean that the end portion 24 of the connecting portion 22 is arranged on the same surface as the end positive electrode current collector 11, but that the end portion 24 of the connecting portion 22 only needs to be arranged on the same surface as the end positive electrode current collector 11.

[0039] In the electrode laminated body 50, the connecting portion 22 is arranged on the same surface as the surface on which the end-side positive electrode current collector 11 is arranged, but the present disclosure is not limited thereto. The connecting portion 22 may be arranged on the same surface as the surface on which the end-side negative electrode current collector 12 is arranged. Moreover, a part of the plurality of connecting portions 22 may be arranged on the same surface as the surface on which the end-side positive electrode current collector 11 is arranged, and the other part of the plurality of connecting portions 22 may be arranged on the same surface as the surface on which the end-side negative electrode current collector 12 is arranged.Accordingly, each connecting portion 22 may extend along the side surface 50a of the electrode laminated body 50 in the laminated direction and may be arranged on the same surface as the surface on which at least one of the end positive electrode current collectors 11 and the end negative electrode current collector 12 is arranged. End insulation layer 30

[0040] The electrode laminate 50 includes the end insulating layer 30. The end insulating layer 30 is disposed on a part of the end positive electrode current collector 11. Furthermore, the connecting portions 22 (the end portions 24) are disposed on the end positive electrode current collector 11 through the end insulating layer 30, and the end portions 24 and the end positive electrode current collector 11 are insulated by the end insulating layer 30. In this way, the end insulating layer 30 is disposed between the end portions 24 and the end positive electrode current collector 11 and plays a role in insulating the end portions 24 and the end positive electrode current collector 11.

[0041] The material of the end insulating layer 30 is not particularly limited, and includes, for example, polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, and the like. The thickness of the end insulating layer 30 is not particularly limited, and is, for example, 5 μm to 300 μm. The disposition method of the end insulating layer 30 is not particularly limited, and, for example, a resin tape may be bonded to the end positive electrode current collector 11. Further, a resin layer may be disposed between the end positive electrode current collector 11 and the end portions 24 of the connecting portion 22. Alternatively, a resin material may also be applied to the end positive electrode current collector 11.

[0042] The end insulating layer 30 may be disposed on the end portions 24. Even if the end insulating layer 30 is disposed on the end portions 24, the end portions 24 and the end positive electrode current collector 11 may be insulated by the end insulating layer 30. Accordingly, the end insulating layer 30 only needs to be disposed between the end portion 24 and the end positive electrode current collector 11. Side surface insulation layer 40

[0043] The electrode laminate 50 includes a side surface insulating layer 40. The side surface insulating layer 40 is disposed on the side surface 50a of the electrode laminate 50. Furthermore, the connecting portions 22 (the extension portions 23) and the side surface 50a of the electrode laminate 50 are insulated by the side surface insulating layer 40. Thus, the side surface insulating layer 40 is disposed on the side surface 50a and plays a role in insulating the extension portions 23 and the side surface 50a. Accordingly, the side surface insulating layer 40 only needs to be disposed on at least a part of the side surface 50a. The side surface insulating layer 40 may be disposed on the entire side surface 50a.

[0044] The material of the side surface insulating layer 40 is not particularly limited, and is made of, for example, polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene, and the like. The thickness of the side surface insulating layer 40 is not particularly limited, and is, for example, 5 μm to 300 μm. The disposition method of the side surface insulating layer 40 is not particularly limited, and, for example, a resin tape may be adhered to the side surface 50a of the electrode laminate 50. Furthermore, a resin layer may be disposed between the side surface 50a of the electrode laminate 50 and the extension portions 23 of the connecting portion 22. Alternatively, a resin material may be applied to the side surface 50a of the electrode laminate 50.

[0045] The side surface insulating layer 40 may be disposed on the extension portions 23. Even if the side surface insulating layer 40 is disposed on the extension portions 23, the extension portions 23 and the side surface 50a of the electrode laminate 50 may be insulated by the side surface insulating layer 40. Accordingly, the side surface insulating layer 40 only needs to be disposed on at least one of the extension portions 23 and the side surface 50a of the electrode laminate 50. Laminated form of the electrode layer body 50

[0046] As described above, the electrode laminated body 50 is a laminated body including the current collectors, the positive electrode layer, the electrolyte layer, and the negative electrode layer. The end current collectors 11, 12 are laminated on both surfaces of the electrode laminated body 50 in the laminated direction, and the plurality of internal current collectors 20 are contained inside the electrode laminated body 50. Other configurations are not particularly limited. Fig. 6 shows sectional views of the electrode laminate 50, which is an example. Fig. The electrode layer body 50 shown in Fig. 6 is an electrode layer body for a bipolar type lithium-ion secondary battery.

[0047] As in Fig. As shown in Figure 6, a plurality of electrode bodies 56 are laminated in the electrode laminated body 50. In the electrode laminated body 50, the number of electrode bodies 56 is not particularly limited and can be appropriately determined depending on the purpose.

[0048] 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 overlapping the negative electrode layer 54 disposed on an upper surface of the negative electrode current collector 52 and the positive electrode layer 53 disposed on a lower surface of the positive electrode current collector 51, with the electrolyte layer 55 sandwiched therebetween. Furthermore, the electrode layer body 50 is shaped such that the plurality of electrode bodies 56 are connected in series.

[0049] The positive electrode current collector 51 arranged on one surface of the electrode laminated body 50 in the layer direction corresponds to the end positive electrode current collector 11, and the negative electrode current collector 52 arranged on the other surface in the layer direction corresponds to the end negative electrode current collector 12. Furthermore, the positive electrode current collector 51 or the negative electrode current collector 52 arranged inside the electrode laminated body 50 corresponds to the inner current collector 20. In Fig. 6, the internal current collector 20 is the positive electrode current collector 51 located inside the electrode layer body 50. Outer packaging body 90

[0050] As in Fig. 1, Fig. 2A and Fig. As shown in Figure 2B, the outer packaging body 90 is made of metal and has a rectangular shape when viewed in the layering direction. The outer packaging body 90 is a box-shaped member with a space for accommodating the electrode layer body 50 inside. Basic structure of the outer packaging body 90

[0051] First, a basic configuration of the outer packaging body 90 will be described. The outer packaging body 90 includes a positive electrode outer packaging body 91 and a negative electrode outer packaging body 92. The outer packaging body 90 also contains insulating resins 93, 94.

[0052] The positive electrode outer packaging body 91 is made of metal and has a box shape including a rectangular bottom plate 91a and four side plates 91b that divide the sides of the bottom plate 91a. That is, the positive electrode outer packaging body 91 has a shape such that a portion has a U-shape. Furthermore, in the positive electrode outer packaging body 91, a surface facing the bottom plate 91a is open. The negative electrode outer packaging body 92 is made of metal and has a box shape including a rectangular bottom plate 92a and four side plates 92b that divide the sides of the bottom plate 92a. That is, the negative electrode outer packaging body 92 has a shape such that a portion has a U-shape. Furthermore, in the negative electrode outer packaging body 92, a surface facing the bottom plate 92a is open.Furthermore, the positive electrode outer packaging bodies 91 and the negative electrode outer packaging bodies 92 are overlapped such that the bottom plates face each other in the layering direction and the side plates face each other in a direction orthogonal to the layering direction. In this way, the space in which the electrode layered body 50 can be accommodated can be formed inside the outer packaging body 90.

[0053] The bottom plate 91a of the positive electrode outer packaging body 91 is shaped to have a larger area than the bottom plate 92a of the negative electrode outer packaging body 92. Therefore, when the electrode layer body 50 is housed in the outer packaging body 90, the side plates 92b of the negative electrode outer packaging body 92 are arranged on the inner side of the side plates 91b of the positive electrode outer packaging body 91.

[0054] The metal of which the positive electrode outer packaging body 91 and the negative electrode outer packaging body 92 are made is not particularly limited, and is made of, for example, aluminum, an aluminum alloy, stainless steel, copper, a copper alloy, nickel steel, and the like. The thicknesses of the positive electrode outer packaging body 91 and the negative electrode outer packaging body 92 are not particularly limited, and are, for example, 0.05 mm or more and 2.0 mm or less.

[0055] Resin 93 is disposed between the side surface of electrode laminated body 50 and the side plates 92b of positive electrode outer packaging body 91. This allows the side surface of electrode laminated body 50 and the side plates 92b of positive electrode outer packaging body 91 to be insulated and fixed. Resin 94 is disposed between the side plates 91b of positive electrode outer packaging body 91 and the side plates 92b of negative electrode outer packaging body 92. This allows the side plates 91b of positive electrode outer packaging body 91 and the side plates 92b of negative electrode outer packaging body 92 to be insulated and fixed.

[0056] The above-described basic configuration of the outer packaging body 90 is described, for example, in Japanese Patent Application No. 2023-006850. Characteristic structure of the outer packaging body 90

[0057] A characteristic portion of the outer packaging body 90 will be described below. The outer packaging body 90 includes a positive electrode terminal 61 arranged on one surface in the layering direction, a negative electrode terminal 62 arranged on the other surface in the layering direction, and a plurality of connection terminals 70 arranged on the same surface as the surface on which the positive electrode terminal 61 is arranged.

[0058] The positive electrode terminal 61 is the bottom plate 91a of the positive electrode outer packaging body 91, and is a portion open to the outside. Typically, an insulating layer may be disposed on an inner surface of the bottom plate 91a of the positive electrode outer packaging body 91 at a portion other than that in contact with the end positive electrode current collector 11, and an insulating layer 95 may be disposed on an outer surface of the bottom plate 91a at a portion other than that connected to the outside (see Fig. 1; in Fig. 2A and Fig. 2B). In this case, the positive electrode terminal 61 is a portion located on the bottom plate 91a of the positive electrode outer packaging body 91 and is open to the outside, so that the insulating layer is not disposed. The same applies to the negative electrode terminal 62. The negative electrode terminal 62 is the bottom plate 92a of the negative electrode outer packaging body 92 and is a portion exposed to the outside. Typically, on an inner side of the bottom plate 92a of the negative electrode outer packaging body 92, an insulating layer may be disposed at a portion other than that in contact with the end negative electrode current collector 12, and on an outer side of the bottom plate 92a, an insulating layer may be disposed at a portion other than that connected to the outside.In this case, the negative electrode terminal 62 is a portion located on the bottom plate 92a of the negative electrode outer packaging body 92 and open to the outside, so that the insulating layer is not arranged.

[0059] Both surfaces of the side plate 91b of the positive electrode outer packaging body 91 and both surfaces of the side plate 92b of the negative electrode outer packaging body 92 may be covered with insulating layers. This allows the inner surfaces of the side plates of the outer packaging body 90 (inner surfaces of the side plates 92b of the negative electrode outer packaging body 92) and the electrode layer body 50 to be insulated. Furthermore, the outer surfaces of the side plates of the outer packaging body 90 (outer surfaces of the side plates 91b of the positive electrode outer packaging body 91) and an external element to be insulated.

[0060] Inside the outer packaging body 90, the positive electrode terminal 61 directly contacts the end positive electrode current collector 11 of the electrode laminated body 50 and is electrically connected to the end positive electrode current collector 11 of the electrode laminated body 50. Inside the outer packaging body 90, the negative electrode terminal 62 directly contacts the end negative electrode current collector 12 of the electrode laminated body 50 and is electrically connected to the end negative electrode current collector 12 of the electrode laminated body 50. Accordingly, both end surfaces of the outer packaging body 90 in the laminated direction function as terminals.In this way, the positive electrode terminal 61 and the negative electrode terminal 62 are electrically connected to the positive electrode end current collector 11 and the negative electrode end current collector 12 of the electrode layer body 50 inside the outer packaging body 90, so that the airtightness and the gas barrier ability are ensured.

[0061] The positive electrode terminal 61 and the end positive electrode current collector 11 are directly contacted and electrically connected inside the outer packaging body 90 from the viewpoint of structural efficiency, but the present disclosure is not limited to this form. The positive electrode terminal 61 and the end positive electrode current collector 11 may be electrically connected inside the outer packaging body 90 indirectly via a conductive member or the like. Similarly, the negative electrode terminal 62 and the end negative electrode current collector 12 are directly contacted and electrically connected inside the outer packaging body 90 from the viewpoint of structural efficiency, but the present disclosure is not limited to this form.The negative electrode terminal 62 and the end negative electrode current collector 12 may be electrically connected inside the outer packaging body 90 indirectly via a conductive member or the like.

[0062] The connection terminals 70 are electrically connected to the connection portions 22 of the electrode laminate 50 and play a role in providing information about the electrode laminate 50 to the outside. The connection terminals 70 are arranged on the bottom plate 91a of the positive electrode outer packaging body 91. That is, the connection terminals 70 are arranged on the same surface as the positive electrode terminal 61. Inside the outer packaging body 90, the connection terminals 70 directly abut the end portions 24 of the connection portion 22 and are electrically connected to the end portions 24 of the connection portion 22. The number of connection terminals 70 corresponds to the number of connection portions 22, and the connection terminals 70 are each connected to the connection portions 22.

[0063] A specific configuration of the connection port 70 is described below. Fig. 7 shows a partial sectional view focusing on the connection terminal 70. As in Fig. 7, the connection terminal 70 includes a through-hole 71 passing through the end surface of the outer packaging body 90 (the bottom plate 91a of the positive electrode outer packaging body 91) in the layering 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.

[0064] The through-hole 71 passes through the end surface of the outer packaging body 90 (the bottom plate 91a of the positive electrode outer packaging body 91) in the layering direction. The size of the through-hole 71 is not particularly limited and can be appropriately determined depending on 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.

[0065] The metal portion 72 is a portion that directly contacts the end portion 24 of the connecting portion 22 and is electrically connected to the end portion 24 of the connecting portion 22 inside the outer packaging body 90. Since the metal portion 72 is connected to the end portion 24 of the connecting portion 22 inside the outer packaging body 90, airtightness and gas barrier properties are ensured. The metal of the metal portion 72 is not particularly limited. For example, there are copper, gold, silver, nickel, chromium, and the like. The metal portion 72 can be arranged only in the through-hole 71.However, in order to increase the connectivity, the metal portion 72 may be arranged not only inside the through-hole 71, but also on an inner peripheral portion and an outer peripheral portion of the outer packaging body 90 (the bottom plate 91a of the positive electrode outer packaging body 91) which are continuous with the through-hole 71.

[0066] The metal portion 72 and the end portion 24 of the connecting portion 22 are directly connected to each other and electrically connected inside the outer packaging body 90 to increase structural efficiency, but the present disclosure is not limited to this form. The metal portion 72 and the end portion 24 of the connecting portion 22 may be electrically connected inside the outer packaging body 90 indirectly via a conductive member or the like.

[0067] The insulating layer 73 plays a role in insulating the metal portion 72 and the outer packaging body 90 (the positive electrode outer packaging body 91). The insulating layer 73 is disposed between the outer packaging body 90 (the positive electrode outer packaging body 91) and the metal portion 72. If the metal portion 72 is disposed only inside the through-hole 71, the insulating layer 73 may be disposed only at an inner portion of the through-hole 71.In the case where the metal portion 72 is disposed inside the through-hole 71 and on the inner peripheral surface portion and the outer peripheral surface portion of the outer packaging body 90 (the bottom plate 91a of the positive electrode outer packaging body 91) that are continuous with the through-hole 71, the insulating layer 73 may be disposed on the inner portion of the through-hole 71 and on an inner peripheral portion and an outer peripheral portion of the outer packaging body 90 that are continuous with the through-hole 71. Typically, the insulating layer 95 is disposed at a portion other than the positive electrode terminal 61 on the bottom plate 91a of the positive electrode outer packaging body 91, as described above.Accordingly, the insulating layer 73 typically forms part of the insulating layer 95 and is disposed on the inner portion of the through-hole 71 and on the inner peripheral portion and the outer peripheral portion of the outer packaging body 90, which are continuous with the through-hole 71.

[0068] The material of the insulating layer 73 is not particularly limited, for example, there are polyimide, polypropylene, polyethylene, polyvinyl chloride, polytetrafluoroethylene and the like.

[0069] The method of attaching the connecting terminal 70 to the outer package body 90 is not particularly limited, and there is, for example, the following method. Fig. 8 shows an example of the method for attaching the connecting terminal 70 to the outer packaging body 90. Fig.8 is a sectional view of the positive electrode outer packaging body 91. First, the through-hole 71 is formed at a predetermined position on the bottom plate 91a of the positive electrode outer packaging body 91. Next, a portion 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 portion of the bottom plate 91a. Then, the metal portion 72 is disposed in the through-hole 71 provided with the insulating layer 73. Examples of the method for disposing the metal portion 72 include plate processing. Effect

[0070] In the current collection plate described in JP 2019-53845 A, the through hole is provided on the outer packaging member, and the electrode and the voltage monitoring terminal are pulled outward from the through hole.

[0071] On the other hand, in the battery 100, inside the outer packaging body 90, the end-side positive electrode current collector 11 and the positive electrode terminal 61 are electrically connected, the end-side negative electrode current collector 12 and the negative electrode terminal 62 are electrically connected, and the connecting portions 22 and the connecting terminal 70 are electrically connected. Accordingly, in the battery 100, the airtightness and the gas barrier property are ensured, and the airtightness and the gas barrier property are improved compared to the related art. Furthermore, in the battery 100, the end-side electrode terminal and the connecting terminal are arranged on the same surface. Accordingly, similar to JP 2019-53845 A, the structural efficiency can be improved compared to the related art.

[0072] The battery in the present disclosure has been described above using the embodiment. With the battery in the present disclosure, it is possible to improve airtightness and gas barrier properties and increase structural efficiency. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2019-53845

[0002] JP 2019-53845 A

[0002] JP 2019-53845 A [0002, 0003, 0035, 0070, 0071] JP 2023-006850

[0056]

Claims

[1] A battery comprising an electrode laminated body inside an outer packaging body, wherein: an end-side positive electrode current collector is arranged on one surface of the electrode layer body in the layer direction; an end-side negative electrode current collector is arranged on the other surface of the electrode layer body in the layer direction; an internal current collector is layered inside the electrode layer body; the internal current collector has a drawn-out connecting portion on a side surface of the electrode layer body; a positive electrode terminal is arranged on one surface of the outer packaging body in the layer direction; a negative electrode terminal is arranged on the other surface of the outer packaging body in the layer direction; a connection terminal is arranged on the same surface as the surface on which at least one of the positive electrode terminal and the negative electrode terminal is arranged; and inside the outer packaging body, the end positive electrode current collector and the positive electrode terminal are electrically connected, the end negative electrode current collector and the negative electrode terminal are electrically connected, and the connecting portion and the connecting terminal are electrically connected. [2] A battery according to claim 1, wherein: the outer packaging body is made of metal; and the connection port a through-hole extending in the layer direction through an end face of the outer packaging body, a metal portion disposed in the through hole, and an insulating layer disposed between the through-hole and the metal portion. [3] The battery according to claim 2, wherein the insulating layer is arranged at an inside portion of the through-hole or at an inner peripheral portion and outer peripheral portion of the outer packaging body adjacent to the through-hole. [4] The battery according to any one of claims 1 to 3, wherein, inside the outer packaging body, the end positive current collector and the positive electrode terminal are in direct contact with each other, the end negative current collector and the negative electrode terminal are in direct contact with each other, and the connecting portion and the connecting terminal are in direct contact with each other.

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