Battery and battery module

Abstract

The utility model relates to a battery and a battery module. A battery cell is provided with: an electrode body in which electrodes and separators are alternately stacked; a battery case in which the electrode body is accommodated; and an electrode lead, one end of which is connected to the electrode body inside the battery case, and the other end of which protrudes from the end of the battery case in the width direction and is folded toward the battery case side.

Description

Technical Field

[0001] The present utility model relates to a battery and a battery module. Background Art

[0002] The secondary battery disclosed in U.S. Patent Publication No. 2021 / 0005872 includes: a battery case that houses an electrode assembly therein; and an electrode lead wire, one end of which is connected to the electrode assembly inside the battery case. The other end of the electrode lead wire protrudes to the outside of the battery case. Summary of the Utility Model

[0003] In the secondary battery disclosed in the above-mentioned U.S. Patent Publication No. 2021 / 0005872, since the other end of the electrode lead wire protrudes to the outside of the battery case, in order to house the other end of the electrode lead wire, the accommodation space becomes large.

[0004] In view of the above facts, an object of the present utility model is to provide a battery and a battery module capable of miniaturizing the package and improving the space efficiency during accommodation.

[0005] The first aspect provides a battery, comprising:

[0006] An electrode body in which electrodes and separators are alternately stacked;

[0007] A battery case that houses the electrode body therein; and

[0008] An electrode lead wire, one end of which is connected to the electrode body inside the battery case, and the other end of which protrudes from an end portion in the width direction of the battery case and folds toward the battery case side.

[0009] In the battery according to the first aspect, there is provided: an electrode body formed by alternately stacking electrodes and separators; a battery case that houses the electrode body therein; and an electrode lead wire, one end of which is connected to the electrode body inside the battery case. Here, the other end of the electrode lead wire protrudes from an end portion in the width direction of the battery case and folds toward the battery case side. Thus, the package is miniaturized in the width direction of the battery case, and the space efficiency during accommodation can be improved.

[0010] In the battery according to the second aspect, based on the first aspect, the other end of the electrode lead wire has: a folding portion that folds toward the battery case side; and an extending portion that extends upward from the folding portion and protrudes from an upper end portion of the battery case.

[0011] In the battery according to the second aspect,

[0012] the other end of the electrode lead wire has: a folding portion that folds toward the battery case side; and

[0013] An extending portion that extends upward from the folding portion and protrudes from the upper end portion of the battery case.

[0014] Thus, it is possible to enter from the upper side of the battery case and connect the electrode leads and the bus bar, etc., so that the connection operation of the electrode leads can be performed after the battery case is housed in a predetermined housing space. Therefore, the assemblability is excellent and the versatility when embedded in the manufacturing process can be improved.

[0015] In the battery of the third aspect, in the first aspect or the second aspect,

[0016] Regarding the battery case, on at least one side surface in the thickness direction of the battery case, a concave housing portion for housing the electrode body therein and an outer end portion provided outside the housing portion are formed.

[0017] The overlapping width of the other end of the electrode lead, which is folded toward the battery case side and overlaps the battery case in the thickness direction, is narrower than the width of the outer end portion.

[0018] In the battery of the third aspect, regarding the battery case, on at least one side surface in the thickness direction of the battery case, a concave housing portion for housing the electrode body therein and an outer end portion provided outside the housing portion are formed. Here, the other end of the electrode lead is configured to be folded toward the battery case side and have an overlapping width that overlaps the battery case in the thickness direction and is narrower than the width of the outer end portion. Therefore, even when the other end of the electrode lead is folded toward the side surface where embossing is performed, the electrode lead can be housed without interfering with the housing portion. As a result, for example, the same design can be applied in both the case where the structure of the battery case is a single cup emboss structure and the case of a double cup emboss structure, and the versatility can be improved.

[0019] In the battery of the fourth aspect, in the first aspect or the second aspect,

[0020] Regarding the battery case, on at least one side surface in the thickness direction of the battery case, a concave housing portion for housing the electrode body therein and an outer end portion provided outside the housing portion are formed.

[0021] The overlapping width of the other end of the electrode lead, which is folded toward the battery case side and overlaps the battery case in the thickness direction, is wider than the width of the outer end portion.

[0022] In the battery of the fourth embodiment, regarding the battery case, on at least one side surface in the thickness direction of the battery case, a concave housing portion for housing the electrode body therein and an outer end portion provided outside the housing portion are formed. Here, the other end of the electrode lead is configured to be folded toward the battery case side and overlap with the battery case in the thickness direction with an overlapping width wider than the width of the outer end portion. Therefore, for example, when a plurality of batteries are stacked and housed in a predetermined housing space along the thickness direction of the battery case, the other end of the electrode lead is in a state of being sandwiched by adjacent battery cases. Thereby, a gap corresponding to the thickness of the electrode lead can be provided at the central portion in the width direction of the battery case, and the expansion and contraction of the battery during charge and discharge can be absorbed by using this gap.

[0023] In addition, when a plurality of batteries are stacked and housed in a predetermined housing space along the thickness direction of the battery case, a predetermined restraint pressure is applied to each battery case along the stacking direction (thickness direction). At this time, since the other end of the electrode lead is sandwiched by adjacent battery cases, the restraint pressure at the end portion in the width direction of the battery case is higher than that at the central portion. Thereby, in the case of a liquid-based battery, the electrolyte can flow well to the central portion of the battery case, and unevenness in the reaction of the electrode body due to the electrolyte in the battery case being biased to one side can be suppressed.

[0024] The fifth embodiment provides a battery module in which the battery described in the first embodiment is housed in a module case, wherein,

[0025] Inside the module case, a plurality of the batteries are stacked along the thickness direction of the battery case, and the other end of the electrode lead is disposed between adjacent battery cases.

[0026] In the fifth battery module, there is a battery in which the other end of the electrode lead is folded toward the battery case side to miniaturize the package in the width direction of the battery case, and a plurality of batteries are stacked along the thickness direction of the battery case inside the module case. Thereby, since the other end of the electrode lead is disposed between adjacent battery cases, the module case can be miniaturized in the width direction of the battery case, and the space efficiency when housing the battery module can be improved.

[0027] As described above, in the battery and the battery module according to the present utility model, the package can be miniaturized and the space efficiency during housing can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Hereinafter, the features, advantages, and technical and industrial significance of exemplary embodiments of the present utility model will be described with reference to the drawings, in which the same reference numerals denote the same elements, and are accompanied by:

[0029] Figure 1It is a schematic top view showing the main part of a vehicle with a battery pack related to an application embodiment.

[0030] Figure 2 It is a schematic perspective view of a battery module related to an embodiment.

[0031] Figure 3 It is a top view of the battery module related to the embodiment with the upper cover of the module housing removed.

[0032] Figure 4 It is a schematic view of a battery cell housed in a battery module observed from the thickness direction.

[0033] Figure 5A It is a diagram showing a part of the manufacturing process of the battery module, and shows the process of folding the electrode leads of the battery cell.

[0034] Figure 5B It is a diagram showing a part of the manufacturing process of the battery module, and shows the process of inserting the electrode leads into the through holes of the bus bar.

[0035] Figure 5C It is a diagram showing a part of the manufacturing process of the battery module, and shows the process of connecting the electrode leads to the bus bar.

[0036] Figure 6 It is a schematic top view partially and magnifiedly showing the state of housing a plurality of battery cells in a module housing.

[0037] Figure 7 It is a diagram showing a modified example of the battery cell, and is a schematic top view partially and magnifiedly showing the state of housing a plurality of battery cells in a module housing. Detailed Embodiment

[0038] Hereinafter, with reference to Figures 1 to 6 An embodiment of the present invention will be described.

[0039] (Overall Structure of Vehicle 100)

[0040] Figure 1 It is a schematic top view showing the main part of a vehicle 100 with a battery pack 10 related to an application embodiment. As Figure 1 shown, the vehicle 100 is a battery electric vehicle (Battery Electric Vehicle (BEV)) with the battery pack 10 mounted under the vehicle floor. In addition, the arrows UP, FR, and LH in each figure respectively indicate the upper side in the vehicle up-down direction, the front side in the vehicle front-rear direction, and the left side in the vehicle width direction. When directions such as front, rear, left, right, up, and down are used for description, unless otherwise specified, they indicate the front and rear in the vehicle front-rear direction, the left and right in the vehicle width direction, and the up and down in the vehicle up-down direction.

[0041] In the vehicle 100 of the present embodiment, as an example, a DC / DC converter 102, an electric compressor 104, and a positive temperature coefficient (PTC) heater 106 are arranged on the vehicle front side of the battery pack 10. In addition, a motor 108, a gearbox 110, an inverter 112, and a charger 114 are arranged on the vehicle rear side of the battery pack 10.

[0042] The direct current output from the battery pack 10 is supplied to the electric compressor 104, the PTC heater 106, the inverter 112, etc. after the voltage is adjusted by the DC / DC converter 102. In addition, by supplying power to the motor 108 via the inverter 112, the rear wheels rotate to drive the vehicle 100.

[0043] A charging port 116 is provided on the right side in the rear part of the vehicle 100. By connecting a charging plug of an external charging device (not shown) to the charging port 116, power can be stored in the battery pack 10 via the in-vehicle charger 114.

[0044] In addition, the arrangement and structure of each component constituting the vehicle 100 are not limited to the above structure. For example, it can also be applied to a hybrid electric vehicle (HV) equipped with an engine or a plug-in hybrid electric vehicle (PHEV). In addition, in the present embodiment, it is assumed to be a rear-wheel drive vehicle with a motor 108 mounted on the rear of the vehicle, but it is not limited thereto. It can also be a front-wheel drive vehicle with a motor 108 mounted on the front of the vehicle, or a pair of motors 108 can be mounted on the front and rear of the vehicle. Furthermore, it can also be a vehicle equipped with in-wheel motors on each wheel.

[0045] Here, the battery pack 10 is configured to include a plurality of battery modules 11. In the present embodiment, as an example, 10 battery modules 11 are provided. Specifically, 5 battery modules 11 are arranged in the vehicle front-rear direction on the right side of the vehicle 100, and 5 battery modules 11 are arranged in the vehicle front-rear direction on the left side of the vehicle 100. In addition, each battery module 11 is electrically connected.

[0046] Figure 2 It is a schematic perspective view of the battery module 11. As Figure 2As shown, the battery module 11 includes a module housing 16 that forms a casing. The module housing 16 is formed in a substantially rectangular parallelepiped shape with the vehicle width direction as the length direction. In addition, the module housing 16 is formed of aluminum alloy. For example, the module housing 16 is formed by joining aluminum die-castings to both ends of an extruded material of aluminum alloy using laser welding or the like.

[0047] At both ends in the vehicle width direction of the battery module 11, a pair of voltage terminals 12 and connectors 14 are respectively provided. A flexible printed circuit board 21 described later is connected to the connector 14. In addition, bus bars 30 are welded to both ends in the vehicle width direction of the battery module 11 (refer to Figure 4 ).

[0048] The length MW in the vehicle width direction of the battery module 11 is, for example, 350 mm to 600 mm, the length ML in the vehicle front-rear direction is, for example, 150 mm to 250 mm, and the height MH in the vehicle up-down direction is, for example, 80 mm to 110 mm.

[0049] Figure 3 is a top view of the battery module 11 with the upper cover removed. As Figure 3 shown, inside the module housing 16, battery cells 20 serving as batteries are housed. As an example, a plurality of battery cells 20 are housed in a arranged (stacked) state inside the module housing 16. In the present embodiment, 24 battery cells 20 are arranged in the vehicle front-rear direction and bonded to each other.

[0050] In addition, for easy understanding in the description, in each of the figures of Figures 3 to 6 , the direction indicated by the arrow W is set as the width direction of the battery cell 20, the direction indicated by the arrow H is set as the height direction (up-down direction) of the battery cell 20, and the direction indicated by the arrow D is set as the thickness direction of the battery cell 20.

[0051] The width direction of the battery housing 22 described later coincides with the width direction W of the battery cell 20. The height direction of the battery housing 22 coincides with the height direction H of the battery cell 20. The thickness direction of the battery housing 22 coincides with the thickness direction D of the battery cell 20.

[0052] A flexible printed circuit (FPC) board 21 is disposed above the battery cell 20. The flexible printed circuit board 21 is formed in a strip shape with the vehicle width direction as the length direction, and thermistors 23 are respectively provided at both end portions of the flexible printed circuit board 21. The thermistors 23 are structured such that they are not adhered to the battery cell 20 and are pressed toward the battery cell 20 side by the upper cover of the battery module 11.

[0053] In addition, inside the module housing 16, one or more cushioning materials (not shown) are accommodated. For example, the cushioning material is an elastically deformable thin plate-like member, and is arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 being the thickness direction. In the present embodiment, as an example, cushioning materials are arranged at both end portions in the length direction and at the central portion in the length direction of the module housing 16.

[0054] Figure 4 is a schematic view of the battery cell 20 accommodated in the battery module 11 as viewed from the thickness direction D. As Figure 4 shown, the battery cell 20 is formed in a long rectangular plate shape with the width direction W being the length direction, and includes a battery housing 22 that forms an outer shell. Inside the battery housing 22, an electrode body 40 is accommodated. The electrode body 40 is formed by laminating a positive electrode as an electrode, a negative electrode as an electrode, and a separator. In the present embodiment, the battery housing 22 is made of a laminated film, and the electrode body 40 is sealed with the laminated film.

[0055] Regarding the battery housing 22, at least one of the thickness directions of the battery housing 22 is embossed. Due to the embossing process, a concave accommodating portion 221 that accommodates the electrode body 40 inside and an outer end portion 223 provided outside the accommodating portion 221 are formed on the side surface. In addition, the battery housing 22 can adopt both a single-cup embossing structure with one embossing and a double-cup embossing structure with two embossings. In the present embodiment, it is a single-cup embossing structure with a hole diameter depth of about 8 mm to 10 mm. Therefore, regarding the battery housing 22, the first side surface 22A on one of the thickness directions becomes the embossed surface that has been embossed, and the second side surface 22B (refer to Figure 6 ) on the other thickness direction becomes the non-embossed surface that has not been embossed.

[0056] The upper end in the width direction of the battery housing 22 is bent, and the corner is chamfered to form a substantially trapezoidal shape. In addition, the upper end portion of the battery housing 22 is bent, and a fixing band 24 is wound along the width direction at the upper end portion of the battery housing 22.

[0057] Here, the battery cell 20 includes electrode leads 26 that protrude from the end portion of the battery housing 22. The electrode leads 26 are respectively provided at both end portions in the width direction of the battery cell. In the present embodiment, as an example, the electrode leads 26 are provided at a position biased downward from the center in the height direction H of the battery cell 20. One end of the electrode lead 26 is connected to the electrode body 40 inside the battery housing 22. The other end of the electrode lead 26 protrudes from the end portion in the width direction of the battery housing 22 and is folded toward the battery housing 22 side.

[0058] The other end of the electrode lead 26 has: a folded portion 261 that folds toward the battery case 22 side; and an extending portion 262 that extends from the folded portion 261 toward the upper side of the battery case 22 and protrudes from the upper end portion of the battery case 22. The electrode lead 26 forms a substantially L-shape through the folded portion 261 and the extending portion 262. The front end of the extending portion 262 is joined to the bus bar 30 by laser welding or the like. The electrode lead 26 is connected to the wiring outside the battery module 11 via the bus bar 30.

[0059] The vehicle width direction length CW1 of the battery cell 20 is, for example, 530 mm to 600 mm, the length CW2 of the region accommodating the electrode body is, for example, 500 mm to 520 mm, and the height CH of the battery cell 20 is, for example, 80 mm to 110 mm. Further, the thickness of the battery cell 20 is 7.0 mm to 9.0 mm, and the height TH of the folded portion 261 of the electrode lead (terminal) 26 is 40 mm to 50 mm.

[0060] Further, in the present embodiment, the other end of the electrode lead 26 is set such that the overlapping width TW that folds toward the battery case 22 side and overlaps the battery case 22 in the thickness direction is smaller than the width CW3 of the outer end portion 223 of the first side surface 22A that is embossed.

[0061] Figures 5A to 5C It is a diagram showing a part of the manufacturing process of the battery module 11, and shows the folding process of the electrode lead 26 and the joining process to the bus bar 30.

[0062] As Figure 5A shown, the other end of the electrode lead 26 is folded at a folding line L1 extending along the end portion in the width direction of the battery case 22, thereby forming a folded portion 261 in the lower part in the height direction H.

[0063] Next, as Figure 5B shown, the bus bar 30 is disposed on the upper side of the battery case 22, and the front end of the extending portion 262 is inserted into the through hole 32 formed through the bus bar 30.

[0064] Next, as Figure 5C shown, the front end of the extending portion 262 protruding upward from the bus bar 30 through the through hole 32 is bent along the folding line L2 and welded to the upper surface of the bus bar 30 by a welding machine 200 or the like. Thus, the electrode lead 26 and the bus bar 30 are joined.

[0065] Figure 5B And Figure 5C shown processes can be performed either before the process of accommodating the battery cell 20 into the module case 16 or after the process of accommodating the battery cell 20 into the module case 16.

[0066] Figure 6 is a schematic top view partially enlarged to show a state in which a plurality of battery cells are housed in the module housing 16. As Figure 6 shown, inside the module housing 16, a plurality of battery cells 20 are stacked along the thickness direction of the battery housing 22, and a folded portion 261 and an extending portion 262 of the electrode lead 26 are disposed between adjacent battery housings 22. In addition, in Figure 6 , for ease of explanation, an interval is provided between the battery cells 20 in the drawing, but in reality, the stacked plurality of battery cells 20 are in contact with each other directly or through a buffer material, and are mutually constrained in a state where a predetermined constraint pressure is applied along the stacking direction (thickness direction D).

[0067] In the present embodiment, the other end of the electrode lead 26 is folded toward the battery housing 22 side, so that the packaging of the battery cell 20 is miniaturized in the width direction W, and thus the accommodation space in the module housing 16 is made more efficient.

[0068] In addition, the overlapping width TW of the other end of the electrode lead 26 and the battery housing 22 is narrower than the width CW3 of the outer end portion 223 of the battery housing 22, so a gap is formed between the electrode lead 26 and the accommodating portion 221 of the battery housing 22.

[0069] In addition, in Figure 6 the manner shown, the electrode lead 26 is folded toward the first side surface 22A side of the battery housing 22, but is not limited thereto. It may also be configured to fold the electrode lead 26 toward the second side surface 22B side.

[0070] Function and Effect

[0071] As described above, in the battery cell 20 according to the embodiment, it includes: an electrode body 40 formed by alternately stacking electrodes and separators; a battery housing 22 that houses the electrode body 40 inside; and an electrode lead 26, one end of which is connected to the electrode body 40 inside the battery housing 22. Here, the other end of the electrode lead 26 protrudes from the end portion in the width direction of the battery housing 22 and is folded toward the battery housing 22 side. Thereby, the packaging is miniaturized in the width direction of the battery housing 22, and the space efficiency during accommodation can be improved.

[0072] In addition, in the embodiment, the other end of the electrode lead 26 has: a folded portion 261 that is folded toward the battery housing 22 side; and an extending portion 262 that extends from the folded portion 261 toward the upper side of the battery housing 22 and protrudes from the upper end portion of the battery housing 22. Thereby, it is possible to enter from the upper side of the battery housing 22 and connect the electrode lead 26 and the bus bar 30, so that the electrode lead 26 can be connected to the bus bar 30 after the battery housing 22 is housed in the module housing 16. Therefore, the assembly property is excellent, and the versatility during embedding in the manufacturing process can be improved.

[0073] In addition, in the embodiment, regarding the battery case 22, embossing is performed on the first side surface 22A on one side in the thickness direction of the battery case 22, forming a concave housing portion 221 that houses the electrode body 40 therein, and an outer end portion 223 provided outside the housing portion 221. Here, the other end of the electrode lead 26 is configured to be folded toward the battery case 22 side and overlap the battery case 22 in the thickness direction with an overlapping width TW that is narrower than the width CW3 of the outer end portion 223. Therefore, as Figure 6 shown, even when the other end of the electrode lead 26 is folded toward the first side surface 22A on which embossing is performed, the other end of the electrode lead 26 can be housed without interfering with the housing portion 221. As a result, the same design can be applied in both the case where the structure of the battery case 22 is a single-cup embossed structure and the case where it is a double-cup embossed structure, improving versatility.

[0074] In addition, as shown in the embodiment, in the battery module 11, a plurality of battery cells 20 are stacked along the thickness direction of the battery case 22 inside the module case 16, and the other ends of the electrode leads 26 are disposed between adjacent battery cases 22. Thereby, the module case 16 can be miniaturized in the width direction of the battery case 22, and the space efficiency when housing the battery module 11 in the battery pack 10 can be improved.

[0075] Modification example of the battery cell

[0076] Next, with reference to Figure 7 the battery cell 60 according to the modification example of the above-described embodiment will be described. In addition, for the same structures as those in the above-described embodiment, the same reference numerals are added and detailed description thereof is omitted.

[0077] Figure 7 is a schematic top view partially and enlargedly showing a state in which a plurality of battery cells 60 are housed in the module case 16. As Figure 7 shown, regarding the battery case 22 that constitutes the outer shell of the battery cell 60, embossing is performed on the first side surface 22A on one side in the thickness direction of the battery case 22. Thereby, a concave housing portion 221 and an outer end portion 223 provided outside the housing portion 221 are formed on the first side surface 22A. The other end of the electrode lead 26 protruding from the end portion in the width direction of the battery case 22 is folded toward the battery case 22 side in the same manner as in the above-described embodiment.

[0078] In addition, in Figure 7 for ease of explanation, an interval is provided between the battery cells 60 in the drawing, but actually, the stacked plurality of battery cells 60 are in contact with each other directly or with a buffer material interposed therebetween, and are mutually constrained in a state where a predetermined constraint pressure is applied along the stacking direction (thickness direction D).

[0079] Here, in this modification example, the other end of the electrode lead 26 is configured to be folded toward the battery case 22 side and the overlapping width TW that overlaps with the battery case 22 in the thickness direction is wider than the width of the outer end portion 223. Thus, when a plurality of battery cells 20 are accommodated in a stacked manner in the accommodation space in the module case 16 along the thickness direction of the battery case 22, the other end of the electrode lead 26 is in a state of being sandwiched by the side surfaces of the adjacent battery cases 22. Thus, a gap corresponding to the thickness of the electrode lead 26 can be provided at the central portion in the width direction of the battery case 22, and the expansion and contraction of the battery cell 20 during charge and discharge can be absorbed by using this gap.

[0080] Further, when a plurality of battery cells 20 are accommodated in a stacked manner in the accommodation space in the module case 16 along the thickness direction of the battery case 22, a predetermined constraint pressure is applied to the battery case 22 of each battery cell 20 along the stacking direction (thickness direction D). At this time, the other end of the electrode lead 26 is sandwiched by the adjacent battery cases 22, so that the constraint pressure at the end portion in the width direction of the battery case 22 is higher than that at the central portion. Thus, in the case of a liquid-based battery, the electrolyte can flow well to the central portion of the battery case 22, and unevenness in the reaction of the electrode body 40 due to the electrolyte in the battery case 22 being biased to one side can be suppressed.

[0081] In addition, in Figure 7 In the manner shown, the other end of the electrode lead 26 is folded toward the second side surface 22B that becomes the non-embossed surface, but it is not limited thereto. The other end of the electrode lead 26 may also be folded toward the first side surface 22A that becomes the embossed surface. Even in this case, the other end of the electrode lead 26 is also in a structure of being sandwiched by the side surfaces of the adjacent battery cases 22.

[0082] As described above, one embodiment and one modification example have been described, but the present utility model can be implemented with various changes without departing from its gist. The scope of rights of the present utility model is of course not limited to the above-described embodiment.

[0083] For example, in the above-described embodiment and modification example, the extending portion 262 is integrally formed with the folding portion 261, but it is not limited thereto. The extending portion 262 may also be formed independently of the folding portion 261 and joined to the folding portion 261 by welding or the like.

[0084] Further, for example, in the above-described embodiment and modification example, the structure is such that the other end of the electrode lead 26 protruding from one battery case 22 is folded and disposed between the adjacent battery cases 22 in the module case 16, but it is not limited thereto. The structure may also be such that, in order to dispose the electrode leads of the adjacent battery cells 20 close to each other, the other ends of the electrode leads 26 protruding from the respective battery cases are folded and disposed between the adjacent battery cases.

Claims

1. A battery, characterized in that: have: an electrode body having electrodes and separators alternately stacked; A battery casing, accommodating the electrode body therein; as well as The electrode lead has one end connected to the electrode body inside the battery case and the other end protruding from an end portion in the width direction of the battery case and folded toward the battery case.

2. The battery according to claim 1, characterized in that The other end of the electrode lead has: a folded portion folded toward the battery case; and an extended portion extending from the folded portion toward the upper side of the battery case and protruding from an upper end portion of the battery case.

3. The battery according to claim 1 or 2, characterized in that: The battery case has a concave receiving portion for receiving the electrode body therein and an outer end portion provided outside the receiving portion formed on at least one side surface in the thickness direction of the battery case. The other end of the electrode lead has a width narrower than a width of the outer end portion, where the other end is folded toward the battery case and overlaps with the battery case in the thickness direction.

4. The battery according to claim 1 or 2, characterized in that: The battery case has a concave receiving portion for receiving the electrode body therein and an outer end portion provided outside the receiving portion formed on at least one side surface in the thickness direction of the battery case. The other end of the electrode lead has a width wider than a width of the outer end portion, where the other end is folded toward the battery case and overlaps with the battery case in the thickness direction.

5. A battery module, characterized in that: The battery according to claim 1 is housed in the module case, wherein: A plurality of the batteries are stacked in the module case along a thickness direction of the battery case, and the other end of the electrode lead is arranged between adjacent battery cases.

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