Battery cell structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell structure and a battery. The battery cell structure comprises a battery cell assembly, the battery cell assembly comprises a first pole group, a second pole group, a positive current collector and a negative current collector, each of the first pole group and the second pole group comprises a positive plate, a diaphragm and a negative plate, and the positive plate of the first pole group is connected with the positive plate of the second pole group through a plurality of positive tabs. The plurality of positive tabs are stacked and are folded by welding to form a positive current collector; the negative plate of the first pole group is connected with the negative plate of the second pole group through a plurality of negative tabs, and the plurality of negative tabs are stacked and are folded through welding to form a negative current collector; the first pole groups of the two battery cell assemblies are arranged in a laminated manner, the second pole groups of the two battery cell assemblies are arranged in a laminated manner, and the positive current collectors of the two battery cell assemblies are arranged adjacently; and the negative current collectors of the two battery cell assemblies are arranged adjacently. Therefore, the number of layers of the tabs which are folded together through welding is reduced, and meanwhile, the number of welding point positions is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery, concretely relates to a battery cell structure and battery. BACKGROUND

[0002] For square lithium ion battery, the general battery cell structure includes two pole groups, which are connected in parallel through welding process. Specifically, the positive tabs of the two pole groups are welded with the positive connection sheets respectively, and the negative tabs of the two pole groups are welded with the negative connection sheets respectively. Among them, the number of negative tabs is multiple, the multiple negative tabs are stacked, and the multiple negative tabs are collected together through ultrasonic welding. The number of positive tabs is multiple, the multiple positive tabs are stacked, and the multiple positive tabs are collected together through ultrasonic welding.

[0003] However, the number of tab layers increases with the number of pole piece layers of the pole group, that is, the number of tab layers of each pole group is consistent with the corresponding number of pole piece layers. When the pole piece of each pole group exceeds a certain number of layers, the number of tab layers is large, which increases the risk of poor tab welding, so that the thickness of the pole group cannot be designed to be larger, resulting in that the capacity of the battery cannot be further improved. In addition, the positive tab and the negative tab are separately arranged in each pole group, which results in more welding points of the battery cell structure, and is not conducive to improving the manufacturing efficiency of the battery cell structure. UTILITY MODEL CONTENT

[0004] In order to solve the problems in the prior art, the utility model provides a battery cell structure and battery, which reduces the number of tab layers collected together by welding, and also reduces the welding points.

[0005] The technical effects achieved by the utility model are realized through the following aspects:

[0006] In a first aspect, the utility model provides a battery cell structure, which includes two battery cell assemblies. Each battery cell assembly includes a first pole group, a second pole group, a positive current collector and a negative current collector. The first pole group and the second pole group each include a positive pole piece, a diaphragm and a negative pole piece. The positive pole pieces of the first pole group and the second pole group are connected by a plurality of positive tabs, and the plurality of positive tabs are stacked and formed into the positive current collector by welding. The negative pole pieces of the first pole group and the second pole group are connected by a plurality of negative tabs, and the plurality of negative tabs are stacked and formed into the negative current collector by welding. The first pole groups of the two battery cell assemblies are stacked, the second pole groups of the two battery cell assemblies are stacked, the positive current collectors of the two battery cell assemblies are arranged adjacently, and the negative current collectors of the two battery cell assemblies are arranged adjacently.

[0007] In some implementations, the battery cell structure further includes a positive adapter sheet, which is welded with the positive current collectors of the two battery cell assemblies respectively; and / or,

[0008] The battery cell structure further comprises a negative tab, which is welded with the negative current collectors of the two battery cell assemblies respectively.

[0009] In some implementations, the positive tabs of the plurality of battery cell assemblies are coincident in the direction of stacking; and / or,

[0010] The negative tabs of the plurality of battery cell assemblies are coincident in the direction of stacking.

[0011] In some implementations, the positive current collectors of the battery cell assemblies are gathered on a side of the battery cell assemblies close to another battery cell assembly; and / or,

[0012] The negative current collectors of the battery cell assemblies are gathered on a side of the battery cell assemblies close to another battery cell assembly.

[0013] In some implementations, the positive current collectors of the two battery cell assemblies are flush in the direction of stacking of the positive tabs; and / or,

[0014] The negative current collectors of the two battery cell assemblies are flush in the direction of stacking of the negative tabs.

[0015] In some implementations, the positive tabs are welded on the same side of the positive current collectors of the two battery cell assemblies; and / or,

[0016] The negative tabs are welded on the same side of the negative current collectors of the two battery cell assemblies.

[0017] In some implementations, the positive current collectors of the two battery cell assemblies are spaced apart in the width direction of the positive current collectors; and / or,

[0018] The negative current collectors of the two battery cell assemblies are spaced apart in the width direction of the negative current collectors.

[0019] In some implementations, the distance between the positive current collectors of the two battery cell assemblies is equal to the distance between the negative current collectors of the two battery cell assemblies in the width direction of the positive current collectors and the width direction of the negative current collectors.

[0020] In some implementations, the positive tab comprises two positive current collector connecting portions and a positive column connecting portion, the two positive current collector connecting portions are spaced apart, the positive column connecting portion is connected with the two positive current collector connecting portions respectively, and the two positive current collector connecting portions are welded with the positive current collectors of the two battery cell assemblies respectively; and / or,

[0021] The negative electrode adapter piece comprises two negative electrode current collector connecting parts and a negative electrode post connecting part, the two negative electrode current collector connecting parts are arranged at intervals, the negative electrode post connecting part is connected with the two negative electrode current collector connecting parts respectively, and the two negative electrode current collector connecting parts are welded with the negative electrode current collectors of the two battery cell assemblies respectively.

[0022] In some implementations, the length of the positive electrode post connecting part is less than the length of the positive electrode current collector connecting part; and / or,

[0023] The length of the negative electrode post connecting part is less than the length of the negative electrode current collector connecting part.

[0024] In the second aspect, the utility model provides a kind of battery, comprising above-mentioned battery cell structure, and the battery further includes shell, and the battery cell structure is housed in the shell.

[0025] In summary, the utility model has at least the following advantages:

[0026] 1. The existing battery cell structure is provided with 2 pole groups, each pole group is provided with n layers of tabs, and the number of tab layers at a single welding point is n. The battery cell structure provided by the utility model is provided with 4 pole groups, each pole group is provided with n / 2 layers of tabs, and the number of tab layers at a single welding point is n / 2. The number of tab layers at a single welding point is reduced by half compared to the prior art, reducing the number of tabs brought together by welding. Without increasing the risk of tab welding failure, the thickness of the battery cell structure can be designed to be larger to increase the capacity of the battery.

[0027] 2. The battery cell structure provided by the utility model connects the positive electrode current collector and the negative electrode current collector between the two pole groups of the same battery cell assembly, so that each battery cell assembly only needs 2 welding points, and the battery cell structure only needs 4 welding points. The number of welding points is reduced by half compared to the prior art, improving the welding efficiency and thereby improving the production efficiency of the battery cell structure. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural diagram of the battery cell structure of some embodiments;

[0029] Figure 2 is Figure 1 is a distribution diagram of the coating material of the integrated positive electrode sheet of the battery cell structure shown in the figure;

[0030] Figure 3 is Figure 1 is a structural diagram of the integrated positive electrode sheet of the battery cell structure shown in the figure;

[0031] Figure 4 is Figure 1 is an exploded view of the battery cell structure shown in the figure;

[0032] Figure 5 For Figure 1 An exploded view of the battery cell structure shown in FIG. 1 from another perspective;

[0033] Figure 6 Structural schematic diagrams of battery cell structures for other embodiments;

[0034] Figure 7 For Figure 6 Yet another structural schematic diagram of the battery cell structure shown in FIG. 1;

[0035] Figure 8 For Figure 7 An enlarged schematic diagram of the battery cell structure shown in FIG. 1 at A;

[0036] Figure 9 Structural schematic diagram of a battery for some embodiments.

[0037] Reference signs in the drawings:

[0038] 10, battery cell structure;

[0039] 100, battery cell assembly; 100a, first battery cell assembly; 100b, second battery cell assembly; 110, pole group; 110a, first pole group; 110b, second pole group; 120, positive pole current collector; 130, negative pole current collector; 140, integrated positive pole tab; 141, positive pole empty foil area; 1411, positive pole cutting area; 142, first positive pole tab; 143, second positive pole tab; 150, positive pole lug;

[0040] 200, positive pole adapter tab; 210, positive pole current collector connecting portion; 220, positive pole post connecting portion;

[0041] 300, negative pole adapter tab; 310, negative pole current collector connecting portion; 320, negative pole post connecting portion;

[0042] 20, housing;

[0043] 30, top cover. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application.

[0045] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based upon the embodiments of the application, all other embodiments that would be obtained by one of ordinary skill in the art without having to make inventive efforts fall within the scope of the application.

[0046] Embodiment 1

[0047] Please refer to the accompanying Figure 1 ~Appendix Figure 5 The battery cell structure 10 of the application comprises a battery cell assembly 100, which comprises a pole group 110, a positive current collector 120 and a negative current collector 130.

[0048] The pole group 110 is two in number, namely a first pole group 110a and a second pole group 110b. The first pole group 110a and the second pole group 110b are both substantially square, i.e. the first pole group 110a and the second pole group 110b are both adapted to a square battery, the first pole group 110a is parallel to the second pole group 110b, and the positive current collector 120 is parallel to the negative current collector 130. The first pole group 110a and the second pole group 110b both comprise a positive plate, a separator and a negative plate, the positive plate of the first pole group 110a and the positive plate of the second pole group 110b are connected by a plurality of positive tabs 150, the plurality of positive tabs 150 are stacked and received by welding to form the positive current collector 120. The negative plate of the first pole group 110a and the negative plate of the second pole group 110b are connected by a plurality of negative tabs, the plurality of negative tabs are stacked and received by welding to form the negative current collector 130.

[0049] It can be understood that the pole group 110 can be a winding type pole group or a laminated pole group. The battery cell assembly 100 can be formed by winding or laminating an integrated positive plate 140, a separator and an integrated negative plate in sequence. The integrated positive plate 140 and the integrated negative plate have similar structures, and for the convenience of illustration, only the structure of the integrated positive plate 140 is described. Figure 2 and Figure 3 The structure of the integrated positive plate 140 is described. First, please refer to Figure 2 The integrated positive plate 140 comprises a first positive plate 142 and a second positive plate 143 formed after the positive material is coated on both sides of the positive foil, and a positive empty foil area 141 formed between the first positive plate 142 and the second positive plate 143 without coating the positive material, the first positive plate 142, the second positive plate 143 and the positive empty foil area 141 are all arranged along the length direction of the integrated positive plate 140. As Figure 3As shown, the integral positive plate 140 can be formed with a plurality of positive cutting regions 1411 on the positive empty foil region 141 by cutting, the plurality of positive cutting regions 1411 are arranged at intervals along the length direction of the integral positive plate 140, and the positive lug 150 is formed between the adjacent two positive cutting regions 1411, so that the integral positive plate 140 is formed with a plurality of positive lugs 150 between the first positive plate 142 and the second positive plate 143.

[0050] Similarly, the integral negative plate includes a first negative plate and a second negative plate formed after coating the negative material on both sides of the negative foil, and a negative empty foil region formed between the first negative plate and the second negative plate without coating the negative material, the first negative plate, the second negative plate and the negative empty foil region are arranged along the length direction of the integral negative plate. The integral negative plate can be formed with a plurality of negative cutting regions on the negative empty foil region by cutting, the plurality of negative cutting regions are arranged at intervals along the length direction of the integral negative plate, and the negative lug is formed between the adjacent two negative cutting regions, so that the integral negative plate is formed with a plurality of negative lugs between the first negative plate and the second negative plate. It should be noted that the integral negative plate and the integral positive plate 140 have the same structure, so the drawings are not shown separately.

[0051] Finally, the first positive plate 142, the first diaphragm and the first negative plate are stacked to form the first pole group 110a, the second positive plate 143, the second diaphragm and the second negative plate are stacked to form the second pole group 110b, the plurality of positive lugs 150 are stacked to form the positive current collector 120, and the plurality of negative lugs are stacked to form the negative current collector 130.

[0052] Further, the number of the battery cell assembly 100 is two, which are the first battery cell assembly 100a and the second battery cell assembly 100b, and the first battery cell assembly 100a and the second battery cell assembly 100b are stacked. Specifically, the first pole group 110a of the two battery cell assemblies 100 is stacked, the periphery of the two first pole groups 110a is arranged in alignment, the second pole group 110b of the two battery cell assemblies 100 is stacked, and the periphery of the two second pole groups 110b is arranged in alignment. The positive current collector 120 of the two battery cell assemblies 100 is arranged adjacent to each other. The negative current collector 130 of the two battery cell assemblies 100 is arranged adjacent to each other.

[0053] In this embodiment, when the ultrasonic pre-welding is performed on each battery cell assembly 100, the positive lug 150 and the negative lug are respectively pre-welded by ultrasonic wave, so that the plurality of layers of the positive lug 150 of each battery cell assembly 100 are sequentially gathered together to form the positive current collector 120, and the plurality of layers of the negative lug of each battery cell assembly 100 are gathered together to form the negative current collector 130.

[0054] The existing battery cell structure sets two pole groups, each pole group sets n layers of tabs, and the number of tab layers at a single welding point is n; while the present application sets four pole groups, each pole group sets n / 2 layers of tabs, and the number of tab layers at a single welding point is n / 2, which is reduced by half compared with the prior art, reducing the number of tabs brought together by welding, and without increasing the risk of poor tab welding, the thickness of the battery cell structure can be designed to be larger to improve the capacity of the battery.

[0055] If the existing battery cell structure also sets four pole groups, but each pole group separately sets a positive current collector and a negative current collector, so that each pole group needs two welding points, resulting in eight welding points for four pole groups; while the present application connects two pole groups of the same battery cell assembly through the positive current collector 120 and the negative current collector 130, so that each battery cell assembly only needs two welding points, and further makes the battery cell structure 10 only need four welding points, which reduces the number of welding points by half compared with the prior art, improves the welding efficiency, and further improves the production efficiency of the battery cell structure 10.

[0056] In some embodiments, the positive current collector 120 and the negative current collector 130 of the battery cell structure 10 can be used to connect with the shell or the pole according to actual needs.

[0057] In some preferred embodiments, the positive projections of the plurality of positive tabs 150 along the stacking direction coincide, so as to pre-weld the plurality of positive tabs 150, while improving the structural compactness of the battery cell assembly 100.

[0058] In some preferred embodiments, the negative projections of the plurality of negative tabs along the stacking direction coincide, so as to pre-weld the plurality of negative tabs, while improving the structural compactness of the battery cell assembly 100.

[0059] In some preferred embodiments, the positive current collector 120 of the battery cell assembly 100 is brought together on the side of the battery cell assembly 100 close to another battery cell assembly 100, so that the multiple layers of positive tabs 150 of the battery cell assembly 100 are brought together on one side, and the positive current collectors 120 of the two battery cell assemblies 100 are close to each other in the stacking direction of the positive tabs 150, improving the convenience of connecting the positive current collectors 120 of the two battery cell assemblies 100 with the shell or the positive pole.

[0060] In some preferred embodiments, the negative current collector 130 of the battery cell assembly 100 is brought together on the side of the battery cell assembly 100 close to another battery cell assembly 100, so that the multiple layers of negative tabs of the battery cell assembly 100 are brought together on one side, and the negative current collectors 130 of the two battery cell assemblies 100 are close to each other in the stacking direction of the negative tabs, improving the convenience of connecting the negative current collectors 130 of the two battery cell assemblies 100 with the shell or the negative pole.

[0061] In some preferred embodiments, the positive current collectors 120 of the two battery cell assemblies 100 are flush in the stacking direction of the positive tabs 150, further improving the convenience of connecting the positive current collectors 120 of the two battery cell assemblies 100 to the shell or the positive post.

[0062] In some preferred embodiments, the negative current collectors 130 of the two battery cell assemblies 100 are flush in the stacking direction of the negative tabs, further improving the convenience of connecting the negative current collectors 130 of the two battery cell assemblies 100 to the shell or the negative post.

[0063] In some preferred embodiments, the positive current collectors 120 of the two battery cell assemblies 100 are arranged in a spaced manner in the width direction of the positive current collectors 120, so that the positive current collectors 120 of the two battery cell assemblies 100 can be connected to the shell or the positive post respectively, improving the convenience of connecting the positive current collectors 120 of the two battery cell assemblies 100 to the shell or the positive post.

[0064] In some preferred embodiments, the negative current collectors 130 of the two battery cell assemblies 100 are arranged in a spaced manner in the width direction of the negative current collectors 130, so that the negative current collectors 130 of the two battery cell assemblies 100 can be connected to the shell or the negative post respectively, improving the convenience of connecting the negative current collectors 130 of the two battery cell assemblies 100 to the shell or the negative post.

[0065] In some preferred embodiments, the distance between the positive current collectors 120 of the two battery cell assemblies 100 is equal to the distance between the negative current collectors 130 of the two battery cell assemblies 100 in the width direction of the positive current collectors 120 and the width direction of the negative current collectors 130, so that the structures of the two battery cell assemblies 100 are similar, and the two battery cell assemblies 100 can be mass-produced by similar processes, improving the manufacturing efficiency of parts.

[0066] Embodiment 2:

[0067] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the battery cell structure 10 of the utility model, please refer to Figures 6-8 .

[0068] The battery cell structure 10 of this embodiment further includes a positive adapter tab 200, the positive adapter tab 200 is welded with the positive current collectors 120 of the two battery cell assemblies 100 respectively, that is, the positive adapter tab 200 is welded with the positive current collector 120 of the first battery cell assembly 100a and the positive current collector 120 of the second battery cell assembly 100b respectively, so that the positive current collectors 120 of the two battery cell assemblies 100 are electrically connected.

[0069] In some preferred embodiments, the battery cell structure 10 further comprises a negative tab 300 welded with the negative current collectors 130 of the two battery cell assemblies 100 respectively, so that the negative current collectors 130 of the two battery cell assemblies 100 are electrically connected through the negative tab 300. In this embodiment, since the negative current collectors 130 of the two battery cell assemblies 100 are electrically connected through the negative tab 300, and the positive current collectors 120 of the two battery cell assemblies 100 are electrically connected through the positive tab 200, the two battery cell assemblies 100 are connected in parallel to increase the capacity of the battery cell structure 10. Since the positive current collectors 120 are connected with the shell or the positive post through the positive tab 200, and the negative current collectors 130 are connected with the shell or the negative post through the negative tab, the convenience of battery assembly is improved.

[0070] In some preferred embodiments, the positive tabs 150 are overlapped in the orthographic projection along the stacking direction, so that the multiple positive tabs 150 are pre-welded, while the compactness of the battery cell assembly 100 is improved.

[0071] In some preferred embodiments, the negative tabs are overlapped in the orthographic projection along the stacking direction, so that the multiple negative tabs are pre-welded, while the compactness of the battery cell assembly 100 is improved.

[0072] In some preferred embodiments, the positive current collectors 120 of the battery cell assemblies 100 are gathered on the side of the battery cell assemblies 100 close to the other battery cell assembly 100, so that the multiple layers of positive tabs 150 of the battery cell assemblies 100 are gathered on one side, and the positive current collectors 120 of the two battery cell assemblies 100 are close to each other in the stacking direction of the positive tabs 150, so that the positive tab 200 can be welded on the positive current collectors 120 of the two battery cell assemblies 100 without excessive bending, improving the welding convenience of the positive tab 200.

[0073] In some preferred embodiments, the negative current collectors 130 of the battery cell assemblies 100 are gathered on the side of the battery cell assemblies 100 close to the other battery cell assembly 100, so that the multiple layers of negative tabs of the battery cell assemblies 100 are gathered on one side, and the negative current collectors 130 of the two battery cell assemblies 100 are close to each other in the stacking direction of the negative tabs, so that the negative tab 300 can be welded on the negative current collectors 130 of the two battery cell assemblies 100 without excessive bending, improving the welding convenience of the negative tab 300.

[0074] In some preferred embodiments, the positive electrode current collectors 120 of the two battery cell assemblies 100 are flush in the stacking direction of the positive electrode tabs 150, and the positive electrode adapter tabs 200 are welded on the same side of the positive electrode current collectors 120 of the two battery cell assemblies 100, so that the positive electrode adapter tabs 200 can be welded on the positive electrode current collectors 120 of the two battery cell assemblies 100 without being bent, improving the welding convenience of the positive electrode adapter tabs 200.

[0075] In some preferred embodiments, the negative electrode current collectors 130 of the two battery cell assemblies 100 are flush in the stacking direction of the negative electrode tabs, and the negative electrode adapter tabs 300 are welded on the same side of the negative electrode current collectors 130 of the two battery cell assemblies 100, so that the negative electrode adapter tabs 300 can be welded on the negative electrode current collectors 130 of the two battery cell assemblies 100 without being bent, improving the welding convenience of the negative electrode adapter tabs 300.

[0076] In some preferred embodiments, the positive electrode current collectors 120 of the two battery cell assemblies 100 are arranged in a spaced manner in the width direction of the positive electrode current collectors 120, so that the positive electrode adapter tabs 200 are left with an area for connecting with the positive electrode posts between the positive electrode current collectors 120 of the two battery cell assemblies 100, improving the connection convenience of the positive electrode adapter tabs 200 with the positive electrode posts.

[0077] In some preferred embodiments, the negative electrode current collectors 130 of the two battery cell assemblies 100 are arranged in a spaced manner in the width direction of the negative electrode current collectors 130, so that the negative electrode adapter tabs 300 are left with an area for connecting with the negative electrode posts between the negative electrode current collectors 130 of the two battery cell assemblies 100, improving the connection convenience of the negative electrode adapter tabs 300 with the negative electrode posts.

[0078] In some preferred embodiments, the distance between the positive electrode current collectors 120 of the two battery cell assemblies 100 is equal to the distance between the negative electrode current collectors 130 of the two battery cell assemblies 100 in the width direction of the positive electrode current collectors 120 and the width direction of the negative electrode current collectors 130, so that the structures of the positive electrode adapter tabs 200 and the negative electrode adapter tabs 300 can be the same, the positive electrode adapter tabs 200 and the negative electrode adapter tabs 300 can be replaced with each other in the case that the materials of the positive electrode adapter tabs 200 and the negative electrode adapter tabs 300 are the same, the positive electrode adapter tabs 200 and the negative electrode adapter tabs 300 do not need to be distinguished during welding, improving the welding efficiency. In addition, since the structures of the positive electrode adapter tabs 200 and the negative electrode adapter tabs 300 can be the same, the positive electrode adapter tabs 200 and the negative electrode adapter tabs 300 can be manufactured in batches together, improving the manufacturing efficiency of the parts.

[0079] In some preferred embodiments, the positive pole adapter piece 200 comprises two positive pole current collector connecting portions 210 and a positive pole post connecting portion 220, the two positive pole current collector connecting portions 210 are arranged at intervals, the positive pole post connecting portion 220 is connected with the two positive pole current collector connecting portions 210 respectively, and the two positive pole current collector connecting portions 210 are welded with the positive pole current collectors 120 of the two battery cell assemblies 100 respectively. By welding the positive pole post connecting portion 220 with the positive pole post, the positive pole current collectors 120 can be connected with the positive pole post through the positive pole adapter piece 200. Preferably, the positive pole adapter piece 200 is manufactured by stamping.

[0080] In some preferred embodiments, the negative pole adapter piece 300 comprises two negative pole current collector connecting portions 310 and a negative pole post connecting portion 320, the two negative pole current collector connecting portions 310 are arranged at intervals, the negative pole post connecting portion 320 is connected with the two negative pole current collector connecting portions 310 respectively, and the two negative pole current collector connecting portions 310 are welded with the negative pole current collectors 130 of the two battery cell assemblies 100 respectively. By welding the negative pole post connecting portion 320 with the negative pole post, the negative pole current collectors 130 can be connected with the negative pole post through the negative pole adapter piece 300. Preferably, the negative pole adapter piece 300 is manufactured by stamping.

[0081] In some preferred embodiments, the length of the positive pole post connecting portion 220 is less than the length of the positive pole current collector connecting portion 210, which reduces the material consumption of the positive pole post connecting portion 220 and is conducive to reducing the cost of the positive pole adapter piece 200.

[0082] In some preferred embodiments, the length of the negative pole post connecting portion 320 is less than the length of the negative pole current collector connecting portion 310, which reduces the material consumption of the negative pole post connecting portion 320 and is conducive to reducing the cost of the negative pole adapter piece 300.

[0083] Embodiment 3:

[0084] This embodiment is based on the above-mentioned embodiments and provides a battery, please refer to Figure 9 .

[0085] A battery comprises the battery cell structure 10, the shell 20 and the top cover 30 of any of the above-mentioned embodiments, the battery cell structure 10 is accommodated in the shell 20, and the top cover 30 covers the shell 20, so that the top cover 30 and the shell 20 jointly form an enclosed space.

[0086] Preferably, the top cover 30 is provided with a positive pole post and a negative pole post.

[0087] In the prior art battery, the cell structure is provided with 2 pole groups, each pole group is provided with n layers of tabs, and the number of tab layers at a single welding point is n; while in the battery of the utility model, the cell structure 10 is provided with 4 pole groups, each pole group is provided with n / 2 layers of tabs, and the number of tab layers at a single welding point is n / 2, the number of tab layers at a single welding point is reduced by half compared with the prior art, the number of tab layers collected together by welding is reduced, the thickness of the cell structure can be designed to be larger without increasing the risk of poor tab welding, so as to improve the capacity of the battery.

[0088] If the cell structure of the prior art battery is also provided with 4 pole groups, but the positive current collector and the negative current collector are separately provided in each pole group, so that 2 welding points are required for each pole group, resulting in 8 welding points required for 4 pole groups; while in the battery of the utility model, the two pole groups of the same cell assembly 100 are connected through the positive current collector 120 and the negative current collector 130, so that each cell assembly 100 only needs 2 welding points, and then the cell structure 10 only needs 4 welding points, the number of welding points is reduced by half compared with the prior art, the welding efficiency is improved, and then the production efficiency of the cell structure 10 is improved.

[0089] In the utility model, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0090] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, structure and operation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for description, and cannot be understood as indicating or implying relative importance.

[0091] Furthermore, terms such as "horizontal," "vertical," "up," "down," "top," "bottom," "side," "end," "front," "back," "upper," "lower," "horizontal," "vertical," and the like are used herein for convenience, are not intended to be limiting, and are not intended to connote orientation of an article. Terms concerning attachments, such as "connected," "attached," "coupled," "interconnected," and the like, are not limited to direct or physical attachments or connections, but can include electrical, logical or other helpful connections or associations.

[0092] In the present application, unless specifically stated and limited otherwise, the first feature above or below the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0093] Although the description of the present application is combined with the above specific embodiments, it is obvious that many substitutions, modifications and changes can be made according to the above content for those skilled in the art. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A battery cell structure, characterized in that: The invention comprises two battery cell assemblies (100), wherein the battery cell assemblies (100) comprise a first electrode group (110a), a second electrode group (110b), a positive electrode current collector (120) and a negative electrode current collector (130); the first electrode group (110a) and the second electrode group (110b) both comprise a positive electrode sheet, a separator and a negative electrode sheet; the positive electrode sheet of the first electrode group (110a) and the positive electrode sheet of the second electrode group (110b) are connected via a plurality of positive electrode tabs, and the plurality of positive electrode tabs are stacked and welded together to form the positive electrode current collector (120); the negative electrode sheet of the first electrode group (110a) and the negative electrode sheet of the second electrode group (110b) are connected via a plurality of negative electrode tabs, and the plurality of negative electrode tabs are stacked and welded together to form the negative electrode current collector (130); The first electrode groups (110a) of the two battery cell assemblies (100) are stacked, the second electrode groups (110b) of the two battery cell assemblies (100) are stacked, the positive electrode current collectors (120) of the two battery cell assemblies (100) are adjacently arranged, and the negative electrode current collectors (130) of the two battery cell assemblies (100) are adjacently arranged.

2. The battery cell structure according to claim 1, characterized in that: The battery cell structure further comprises a positive electrode adapter (200), wherein the positive electrode adapter (200) is respectively welded to the positive electrode current collectors (120) of the two battery cell assemblies (100); and / or, The battery cell structure further comprises a negative electrode adapter plate (300), wherein the negative electrode adapter plate (300) is respectively welded to the negative electrode current collectors (130) of the two battery cell assemblies (100).

3. The battery core structure according to claim 1 or 2, characterized in that: The orthographic projections of the plurality of positive electrode tabs along the stacking direction overlap; and / or, The orthographic projections of the plurality of negative electrode tabs along the stacking direction overlap.

4. The battery core structure according to claim 2, characterized in that: The positive electrode current collector (120) of the battery cell assembly (100) is gathered on a side of the battery cell assembly (100) close to another battery cell assembly (100); and / or, The negative electrode current collector (130) of the battery cell assembly (100) is gathered at a side of the battery cell assembly (100) close to another battery cell assembly (100).

5. The battery core structure according to claim 4, characterized in that: In the stacking direction of the positive electrode tabs, the positive electrode current collectors (120) of the two battery cell assemblies (100) are flush; and / or, In the stacking direction of the negative electrode tabs, the negative electrode current collectors (130) of the two battery cell assemblies (100) are flush.

6. The battery core structure according to claim 5, characterized in that: The positive electrode adapter (200) is welded to the same side of the positive electrode current collectors (120) of the two battery cell assemblies (100); and / or, The negative electrode adapter (300) is welded to the same side of the negative electrode current collectors (130) of the two battery cell assemblies (100).

7. The battery core structure according to claim 2, characterized in that: In the width direction of the positive electrode current collector (120), the positive electrode current collectors (120) of the two battery cell assemblies (100) are arranged at intervals; and / or, In the width direction of the negative electrode current collector (130), the negative electrode current collectors (130) of the two battery cell assemblies (100) are arranged at intervals.

8. The battery cell structure according to claim 7, characterized in that: In the width direction of the positive electrode current collector (120) and the width direction of the negative electrode current collector (130), the distance between the positive electrode current collectors (120) of the two battery cell assemblies (100) is equal to the distance between the negative electrode current collectors (130) of the two battery cell assemblies (100).

9. The battery core structure according to claim 7, characterized in that: The positive electrode adapter (200) comprises two positive electrode current collector connecting parts (210) and a positive electrode column connecting part (220), the two positive electrode current collector connecting parts (210) are arranged at intervals, the positive electrode column connecting part (220) is respectively connected to the two positive electrode current collector connecting parts (210), and the two positive electrode current collector connecting parts (210) are respectively welded to the positive electrode current collectors (120) of the two battery cell assemblies (100); and / or, The negative electrode adapter (300) comprises two negative electrode current collector connecting parts (310) and a negative electrode column connecting part (320), wherein the two negative electrode current collector connecting parts (310) are arranged at intervals, the negative electrode column connecting part (320) is respectively connected to the two negative electrode current collector connecting parts (310), and the two negative electrode current collector connecting parts (310) are respectively welded to the negative electrode current collectors (130) of the two battery cell assemblies (100).

10. The battery core structure according to claim 9, characterized in that: The length of the positive electrode column connection portion (220) is less than the length of the positive electrode current collector connection portion (210); and / or, The length of the negative electrode column connection portion (320) is smaller than the length of the negative electrode current collector connection portion (310).

11. The battery core structure according to claim 1, characterized in that: The positive electrode current collector (120) of the battery cell assembly (100) is gathered on a side of the battery cell assembly (100) close to another battery cell assembly (100); and / or, The negative electrode current collector (130) of the battery cell assembly (100) is gathered at a side of the battery cell assembly (100) close to another battery cell assembly (100).

12. The battery core structure according to claim 11, characterized in that: In the stacking direction of the positive electrode tabs, the positive electrode current collectors (120) of the two battery cell assemblies (100) are flush; and / or, In the stacking direction of the negative electrode tabs, the negative electrode current collectors (130) of the two battery cell assemblies (100) are flush.

13. The battery core structure according to claim 1, characterized in that: In the width direction of the positive electrode current collector (120), the positive electrode current collectors (120) of the two battery cell assemblies (100) are arranged at intervals; and / or, In the width direction of the negative electrode current collector (130), the negative electrode current collectors (130) of the two battery cell assemblies (100) are arranged at intervals.

14. The battery core structure according to claim 13, characterized in that: In the width direction of the positive electrode current collector (120) and the width direction of the negative electrode current collector (130), the distance between the positive electrode current collectors (120) of the two battery cell assemblies (100) is equal to the distance between the negative electrode current collectors (130) of the two battery cell assemblies (100).

15. A battery, characterized in that: The battery comprises the battery cell structure according to any one of claims 1 to 14, wherein the battery further comprises a shell (20), and the battery cell structure (10) is accommodated in the shell (20).

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