Battery

Abstract

The utility model provides a battery, and relates to the technical field of batteries. The battery comprises a battery cell and a switching piece, the battery cell comprises a battery cell main body and a plurality of tabs, the tabs are connected to the same end of the battery cell main body, and the tabs are bent in the same direction relative to the battery cell main body; the heights of the plurality of tabs are sequentially reduced along the bending direction, so that the plurality of tabs are sequentially stacked after being bent; the adapter plate is welded on one side, deviating from the battery cell main body, of the plurality of tabs which are arranged in a laminated manner, so that the tabs can be overlapped when being bent, and the adapter plate and the tabs are welded in an overlapping area, so that the adapter plate and the tabs can be ensured to have good welding quality, the overcurrent capacity between the battery cell and the adapter plate is improved, and the service life of the battery cell is prolonged. And the calorific value of the battery in the charging and discharging process is reduced, so that the battery performance is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0002] Batteries are widely used in various power supply devices, including consumer electronics, new energy vehicles, and energy storage devices. Batteries have different sizes depending on the application scenario, and the battery shell can adopt different structures and materials.

[0003] In the related art, a battery cell is arranged inside a battery shell, and an installation opening is opened on the shell. A top cover with a pole can be covered on the installation opening, and the pole and the pole of the battery cell are electrically connected through a metal adapter. The pole of the battery cell has multiple layers, and the multiple layers of pole ears and the metal adapter are usually connected by welding.

[0004] However, the welding quality of the tabs of the battery cells in the current batteries is poor when they are welded to the metal adapters, resulting in insufficient current flow capacity between the battery cells and the metal adapters. Utility Model Content

[0005] In view of the above problems, an embodiment of the present application provides a battery to solve the technical problem that the current welding quality of the battery cell's tabs is poor when welded to the metal adapter, resulting in insufficient current flow capacity between the battery cell and the metal adapter.

[0006] In order to achieve the above-mentioned purpose, the present application provides a battery, which includes a battery cell and a converter, the battery cell includes a battery cell body and multiple pole ears, the multiple pole ears are connected to the same end of the battery cell body, and the multiple pole ears are bent in the same direction relative to the battery cell body; the heights of the multiple pole ears decrease successively along the bending direction, so that the multiple pole ears are stacked in sequence after being bent; the converter is welded to the side of the multiple pole ears arranged in the stacked manner that is away from the battery cell body.

[0007] The battery provided in the present application sets the pole ears of the battery cell to different heights so that the pole ears can overlap when bent, thereby welding the adapter and the pole ears in the overlapping area to ensure that both the adapter and the pole ears have good welding quality, thereby improving the current flow capacity between the battery cell and the adapter, reducing the heat generated by the battery during the charging and discharging process, and improving the battery performance.

[0008] As an optional implementation, the top edges of the plurality of tabs are arranged flush after being bent.

[0009] Such an arrangement can ensure that the multiple tabs can have a sufficiently large overlapping area after being bent, so as to ensure good welding performance between the adapter and all the tabs.

[0010] As an alternative embodiment, the top edges of multiple tabs after bending are all within the projection range of the top surface of the battery cell body in the vertical direction.

[0011] With this arrangement, it is avoided that the tabs of the battery cell contact other external components after bending, causing a short circuit.

[0012] As an alternative embodiment, the heights of multiple tabs are arranged in an arithmetic progression along their arrangement direction.

[0013] With this arrangement, after the battery cell is wound and formed, multiple tabs can accurately overlap with each other in sequence when being bent.

[0014] As an alternative embodiment, a tab may include a connecting section and a bending section. The connecting section is connected to the battery cell body, and the bending section is connected to one end of the connecting section away from the battery cell body. When the tab is bent, the connecting section is vertically arranged relative to the battery cell body, and the bending section is bent relative to the connecting section.

[0015] With this arrangement, when the connecting piece is welded to the tab, it is avoided that the connecting piece penetrates through to the battery cell body during welding, so as to prevent damage to the battery cell body.

[0016] As an alternative embodiment, a tab may include a positive tab and a negative tab. Among them, when the positive tab is bent, the connection position between the connecting section and the bending section has an arc transition; when the negative tab is bent, it is vertically arranged between the connecting section and the bending section.

[0017] With this arrangement, after the positive tab and the negative tab are bent, they can be as close as possible to the battery cell body, so as to reduce space waste and improve the energy density of the battery.

[0018] As an alternative embodiment, there is a pressing and folding section between the connecting section and the bending section, and the pressing and folding section is pressed and folded in the direction opposite to the direction in which the bending section is bent relative to the connecting section.

[0019] With this arrangement, it can be ensured that multiple tabs can be bent synchronously.

[0020] As an alternative embodiment, the side of the connecting piece facing away from the tab has a welding area, and the welding area at least covers the area where multiple tabs overlap in the vertical direction after bending.

[0021] With this arrangement, the welding reliability between the connecting piece and the tab can be improved, the welding mark area can be increased, and the current-carrying capacity between the tab and the connecting piece can be improved.

[0022] As an alternative embodiment, the connecting piece is configured to penetrate and weld with the tab from the side facing away from the tab; after multiple tabs are bent, there are M layers, and the number of layers of the tab penetrated and welded by the connecting piece is N layers, where N ≤ M - 1.

[0023] With such a setting, damage to the battery cell body caused by the penetration welding of the transition piece and the tab can be avoided.

[0024] As an alternative embodiment, the battery may further include a housing and a top cover assembly. The battery cell is disposed inside the housing; the top cover assembly is covered above the housing and is hermetically connected to the housing; the top cover assembly includes a terminal post, and the terminal post is welded to the transition piece.

[0025] With such a setting, the gap between the battery cell and the top cover assembly can be reduced, the space occupancy rate of the battery cell inside the housing can be increased, and the energy density can be improved.

[0026] The present application provides a battery, which includes a battery cell and a transition piece. The battery cell includes a battery cell body and a plurality of tabs. The plurality of tabs are connected to the same end of the battery cell body, and the plurality of tabs are bent in the same direction relative to the battery cell body; the heights of the plurality of tabs decrease in sequence along the bending direction, so that the plurality of tabs are stacked in sequence after being bent; the transition piece is welded to the side of the stacked plurality of tabs facing away from the battery cell body, so that the tabs can overlap when being bent, and thus the transition piece and the tabs are welded in the overlapping area to ensure that the transition piece and all the tabs can have good welding quality, improve the over-current capacity between the battery cell and the transition piece, reduce the heat generation amount of the battery during the charging and discharging process, and further improve the battery performance.

[0027] In addition to the technical problems solved by the present application, the technical features constituting the technical solution, and the beneficial effects brought by these technical features of the technical solution described above, other technical problems that the battery provided by the present application can solve, other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 Schematic diagram of the connection between the battery cell and the transition piece in the battery provided by the embodiment of the present application;

[0030] Figure 2 Top view of the connection between the battery cell and the transition piece in the battery provided by the embodiment of the present application;

[0031] Figure 3 Schematic diagram of the structure of the battery cell in the battery provided by the embodiment of the present application;

[0032] Figure 4 Schematic diagram of the unfolded state of the electrode sheet of the battery cell provided by the embodiment of the present application;

[0033] Figure 5 Top view of the battery cell provided by the embodiment of the present application;

[0034] Figure 6 is Figure 5 Cross-sectional view in the A-A direction of

[0035] Figure 7 is Figure 6 Partial view at position B of

[0036] Figure 8 Schematic diagram of the structure of the top cover assembly of the battery provided by the embodiment of the present application;

[0037] Figure 9 Exploded view of the top cover assembly of the battery provided by the embodiment of the present application.

[0038] Explanation of reference numerals:

[0039] 10 - Battery;

[0040] 100 - Battery cell; 110 - Battery cell main body; 120 - Tab; 121 - Connection section; 122 - Bending section; 120a - Positive tab; 120b - Negative tab;

[0041] 200 - Adapter plate; 200a - Positive adapter plate; 200b - Negative adapter plate; 201 - Welding area;

[0042] 300 - Top cover assembly; 301 - Liquid injection hole; 310 - Lower plastic; 320 - Metal sheet; 330 - Terminal; 340 - Upper plastic; 350 - Sealing ring; 360 - Explosion-proof valve. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0044] Batteries are widely used in various power supply devices, including consumer electronics, new energy vehicles, and energy storage devices, etc. According to different application scenarios, batteries have different sizes and structures, and the battery housing can be made of different materials. Currently, a battery cell is arranged inside the battery housing, and an installation opening is provided on the housing. A top cover provided with a pole column 330 can be covered on the installation opening, and the pole column 330 is electrically connected to the tab of the battery cell through a metal adapter plate. Among them, the tab of the battery cell and the metal adapter plate are usually connected by welding.

[0045] However, currently, the welding imprint area between the tab of the battery cell and the metal adapter plate in the battery is small, and it is impossible to ensure good welding effects with most tabs, resulting in insufficient current-carrying capacity between the battery cell and the metal adapter plate. During the charging and discharging process of the battery, it is easy to cause the battery to overheat. Therefore, the current welding method and process of the battery cell tab and the adapter plate pose potential safety risks to the battery.

[0046] This application provides a battery. By setting the tabs of the battery cell to different heights, the tabs can overlap when bent, so as to weld the adapter plate and the tabs in the overlapping area, ensuring that good welding quality can be achieved between the adapter plate and all tabs, improving the current-carrying capacity between the battery cell and the adapter plate, reducing the heat generation during the charging and discharging process of the battery, and improving the battery performance.

[0047] The following describes the battery according to the embodiments of this application with reference to the drawings. It should be noted that the battery provided by the embodiments of this application can be a secondary battery, that is, the battery in the embodiments of this application can be charged, discharged, and recycled. The specific types of the battery can include but are not limited to lithium batteries, lithium cobalt oxide batteries, lithium iron phosphate batteries, ternary batteries, etc. The scenarios where the battery can be used include but are not limited to electronic products, communication devices, transportation tools, etc., such as products like mobile phones, computers, and new energy vehicles. The embodiments of this application do not make specific limitations in this regard.

[0048] Figure 1 It is a schematic connection diagram of the battery cell and the adapter plate in the battery provided by the embodiments of this application; Figure 2 It is a top view of the connection of the battery cell and the adapter plate in the battery provided by the embodiments of this application; Figure 3 It is a schematic structural diagram of the battery cell in the battery provided by the embodiments of this application; Figure 4 It is a schematic diagram of the unfolded state of the battery cell electrode plate in the battery provided by the embodiments of this application; Figure 5 It is a top view of the battery cell in the battery provided by the embodiments of this application; Figure 6 is Figure 5 a cross-sectional view in the A-A direction of Figure 7 is Figure 6 a partial view at position B in

[0049] Please refer to Figures 1 to 7, in an embodiment of the present application, a battery 10 includes a battery cell 100 and a connecting piece 200. The battery cell 100 includes a battery cell main body 110 and a plurality of tabs 120. The plurality of tabs 120 are connected to the same end of the battery cell main body 110, and the plurality of tabs 120 are bent in the same direction relative to the battery cell main body 110.

[0050] Among them, the heights of the plurality of tabs 120 decrease in sequence along the bending direction, so that the plurality of tabs 120 are stacked in sequence after being bent. The connecting piece 200 is welded to the side of the stacked plurality of tabs 120 facing away from the battery cell main body 110.

[0051] It can be understood that the battery cell 100 can be a wound core structure formed by winding electrode plates. The tabs 120 can be located at the top of the battery cell main body 110. Before welding the connecting piece 200, the tabs 120 can be bent first. Before the tabs 120 are bent, the tabs 120 are vertically arranged relative to the battery cell main body 110 at its top. After the tabs 120 are bent, the tabs 120 are bent relative to the battery cell main body 110 towards the horizontal direction. The connecting piece 200 is located above the tabs 120 and is welded to the tabs 120 by means of penetration welding.

[0052] It should be noted that in the battery 10 provided by the embodiment of the present application, since the tabs 120 of the battery cell 100 are set to different heights, the tabs 120 can overlap when being bent, so that the connecting piece 200 and the tabs 120 are welded in the overlapping area, so as to ensure that the connecting piece 200 and all the tabs 120 can have good welding quality, improve the current-carrying capacity between the battery cell 100 and the connecting piece 200, reduce the heat generation amount of the battery 10 during the charging and discharging process, and improve the performance of the battery 10.

[0053] In some embodiments, the top edges of the plurality of tabs 120 after being bent are flush with each other, so as to ensure that the plurality of tabs 120 can have a sufficiently large overlapping area after being bent, so as to ensure good welding performance between the connecting piece 200 and all the tabs 120.

[0054] It can be understood that after the battery cell 100 is wound and formed, the plurality of tabs 120 are arranged on the top of the battery cell main body 110 from the inside to the outside of the wound core, that is, arranged in sequence from the center to the outside. Since the tabs 120 are bent before the connecting piece 200 is welded to the tabs 120, therefore, the plurality of tabs 120 are not welded and fixed when being bent, and the plurality of tabs 120 can be stacked together along the same direction after being bent.

[0055] Herein, the inner side of the battery cell 100 refers to the starting end of the electrode sheet winding when the battery cell 100 is wound and formed, that is, the center of the wound battery cell 100, and the outer side of the battery cell 100 refers to the ending end of the electrode sheet winding when the battery cell 100 is wound and formed, that is, the outer layer of the wound battery cell 100.

[0056] Exemplarily, the height of the tab 120 located on the inner side of the battery cell 100 is lower than the height of the tab 120 located on the outer side of the battery cell 100. In this way, when the tab 120 is folded, the tab 120 on the outer side folds towards the inner side of the battery cell 100, and the folding direction of the tab 120 on the inner side is the same as that of the tab 120 on the outer side, so that the tabs 120 from the outer side to the inner side can overlap each other, with the tab 120 on the inner side located at the lower layer and the tab 120 on the outer side located at the upper layer.

[0057] In some embodiments, the top edges of the folded multiple tabs 120 are all within the projection range in the vertical direction of the top surface of the battery cell main body 110, so as to prevent the tabs 120 of the battery cell 100 from contacting other external components after being bent and causing a short circuit.

[0058] In the battery 10 provided by the embodiment of the present application, there can be multiple battery cells 100, and the tabs 120 of the multiple battery cells 100 can be welded to the adapter plate 200 simultaneously. The number of battery cells 100 can be two or more. The structures and bending methods of the tabs 120 of different battery cells 100 are similar or the same, which will not be elaborated herein.

[0059] In some embodiments, the heights of the multiple tabs 120 are arranged in an arithmetic progression along their arrangement direction, so that after the battery cell 100 is wound and formed, the multiple tabs 120 can accurately overlap each other in sequence when being bent, ensuring that the adapter plate 200 has good welding reliability with all the tabs 120 when welding in the overlapping area with the tabs 120.

[0060] Exemplarily, the height of the tab 120 located at the innermost side of the battery cell 100 is H, and the height difference between two adjacent tabs 120 is h. Then the heights of the tabs 120 from the inner side to the outer side of the battery cell 100 are H, H + h, H + 2h, H + 3h... H+(p - 1)h, H + ph in sequence, where p + 1 is the number of the overlapping tabs 120 of the battery cell 100.

[0061] Exemplarily, the battery 10 can include two battery cells 100, and the tabs 120 of the two battery cells 100 are bent towards each other. The adapter plate 200 has at least two welding areas 201, and the tabs 120 of the two battery cells 100 are respectively provided with different welding areas 201, so that the tabs 120 of the two battery cells 100 can be welded to the adapter plate 200 simultaneously and have a large weld mark area.

[0062] It can be understood that the two battery cells 100 can be arranged side by side. The tab 120 of the first battery cell 100 is bent towards the second battery cell 100, that is, the tab 120 of the first battery cell 100 is bent towards the space between the two battery cells 100. The tab 120 of the second battery cell 100 is bent towards the first battery cell 100, that is, the tab 120 of the second battery cell 100 is bent towards the space between the two battery cells 100. In this way, the tabs 120 of the two battery cells 100 can be closer after being bent, making it easier for the connecting piece 200 to cover the tabs 120 of the two battery cells 100 and making full use of the surface of the connecting piece 200.

[0063] Please continue to refer to Figures 1 to 7 , in some embodiments, the tab 120 may include a connecting section 121 and a bending section 122. The connecting section 121 is connected to the battery cell main body 110, and the bending section 122 is connected to one end of the connecting section 121 away from the battery cell main body 110. When the tab 120 is bent, the connecting section 121 is vertically arranged relative to the battery cell main body 110, and the bending section 122 is bent relative to the connecting section 121.

[0064] It can be understood that when the connecting piece 200 is welded to the tab 120, the connecting section 121 of the bent tab 120 still remains in the vertical state, which can prevent the connecting piece 200 from welding through to the battery cell main body 110, thereby preventing damage to the battery cell main body 110.

[0065] In some embodiments, the tab 120 may include a positive tab 120a and a negative tab 120b. Among them, when the positive tab 120a is bent, the connection position between the connecting section 121 and the bending section 122 has an arc transition. When the negative tab 120b is bent, the connecting section 121 and the bending section 122 are vertically arranged. In this way, after the positive tab 120a and the negative tab 120b are bent, they can be as close as possible to the battery cell main body 110 to reduce space waste and improve the energy density of the battery 10.

[0066] It can be understood that there is a difference in hardness between the negative tab 120b and the positive tab 120a. The hardness of the negative tab 120b is greater than that of the positive tab 120a. When the positive tab 120a is being bent, the connection position between the connecting section 121 and the bending section 122 has an arc transition, which is more conducive to the realization of the bending process of the positive tab 120a. When the negative tab 120b is being bent, the connecting section 121 and the bending section 122 are vertically arranged, which is more conducive to the realization of the bending process of the negative tab 120b.

[0067] In some embodiments, the connecting piece 200 includes a positive connecting piece 200a and a negative connecting piece 200b. The positive tab 120a and the negative tab 120b are connected to the same end of the battery cell main body 110. The positive connecting piece 200a is welded to the positive tab 120a, and the negative connecting piece 200b is welded to the negative tab 120b.

[0068] It can be understood that before the positive connection piece and the negative connection piece are welded to the positive ear 120a and the negative ear 120b, the negative ear 120b and the positive ear 120a can both be bent. When the positive connection piece is welded to the positive ear 120a and the negative connection piece is welded to the negative ear 120b, the welding mark area can be increased, and thus the positive and negative poles of the battery cell 100 can both have good over-current capacity.

[0069] In some embodiments, there is a pressed section between the connecting section 121 and the bent section 122. The pressed section is pressed in the direction opposite to the direction in which the connecting section 121 bends toward the bent section 122, so as to ensure that multiple ears 120 can be bent synchronously.

[0070] It can be understood that when bending multiple ears 120, a pressure can be applied to the ears 120 in a certain direction to bend the vertical ears 120. In this process, a pressed section that is pressed in the opposite direction can be formed at the connection position between the connecting section 121 and the bent section 122.

[0071] Please continue to refer to Figures 1 to 7 , in a possible implementation manner, the side of the adapter piece 200 facing away from the ear 120 has a welding area 201, and the welding area 201 at least covers the area where multiple ears 120 overlap along the vertical direction after being bent, so as to improve the welding reliability between the adapter piece 200 and the ear 120, increase the welding mark area, and improve the over-current capacity between the ear 120 and the adapter piece 200.

[0072] Among them, the welding mark can include multiple welding segments, and the multiple welding segments are sequentially arranged at intervals along the length direction of the top end face of the battery cell 100. The multiple welding segments can be connected end to end in sequence. In this way, the proportion of the welding mark area can be increased within the welding area 201, and the over-current capacity between the adapter piece 200 and the ear 120 can be improved.

[0073] Exemplarily, multiple welding marks are arranged on the welding area 201 in a staggered manner, and the welding marks can cover different area positions of multiple ears 120, improving the welding reliability between the adapter piece 200 and the ear 120.

[0074] In some embodiments, the adapter piece 200 is configured to penetrate-weld with the ear 120 from the side facing away from the ear 120; after multiple ears 120 are bent, there are M layers, and the number of layers of the ear 120 penetrated by the adapter piece 200 for penetration welding is N layers, where N≤M - 1. In this way, it is avoided that the adapter piece 200 damages the battery cell main body 110 when penetrating-welding with the ear 120.

[0075] It should be noted that the specific number of layers of the overlapping arrangement of the ears 120 in the embodiments of the present application is not limited.

[0076] In some embodiments, the battery cell 100 may further include an insulating film, which is coated on the outside of the battery cell 100; at least a portion of the insulating film is bonded to the top of the battery cell body 110, and the insulating film bonded to the top of the battery cell body 110 is at least partially bonded to the surface of the adapter 200 facing away from the battery cell body 110.

[0077] It is understandable that the insulating film can fix the bent tab 120 and the adapter 200 welded to the tab 120 to prevent the rebound tab 120 from warping after bending.

[0078] Exemplarily, the material of the insulating film may be a tough polyester polymer material having good flexibility and high temperature resistance.

[0079] Figure 8 A schematic diagram of the structure of a top cover assembly in a battery provided in an embodiment of the present application; Figure 9 An exploded view of a top cover assembly in a battery provided in an embodiment of the present application.

[0080] Please refer to Figures 1 to 9 In a possible implementation, the battery 10 may further include a shell and a top cover assembly 300, and the battery cell 100 is disposed in the shell. The top cover assembly 300 is disposed above the shell and is sealed with the shell. The top cover assembly 300 includes a pole 330, and the pole 330 is welded to the adapter 200. In this way, the gap between the battery cell 100 and the top cover assembly 300 can be reduced, the space occupied by the battery cell 100 inside the shell can be increased, and the energy density can be increased.

[0081] It is understandable that the top cover assembly 300 may also include a lower plastic 310, a metal sheet 320, an upper plastic 340 and a sealing ring 350. The pole 330 is inserted into the lower plastic 310, the pole 330 is welded to the adapter 200, and the metal sheet 320 is connected to the upper part of the lower plastic 310 and is sealed and welded to the shell. The upper plastic 340 is sleeved on the outer side of the pole 330 to achieve insulation between the pole 330 and the metal sheet 320. The sealing ring 350 is located between the lower plastic 310 and the pole 330 to ensure that the accommodating cavity has good sealing performance.

[0082] For example, the lower plastic 310 and the upper plastic 340 may be made of injection-molded insulating plastic materials, and the metal sheet 320 may be a plain aluminum sheet.

[0083] It can be understood that the top cover assembly 300 has a liquid injection hole 301, and the liquid injection hole 301 is used to inject electrolyte into the accommodating cavity.

[0084] It should be noted that the top cover assembly 300 may be provided with mounting holes, and the explosion-proof valve 360 may be disposed on the mounting holes. The explosion-proof valve 360 may include an explosion-proof sheet and a protection sheet, and the explosion-proof valve 360 is used to relieve pressure on the battery 10 when the internal pressure of the battery 10 is too high.

[0085] An embodiment of the present application provides a battery 10, which includes a battery cell 100 and a connection piece 200. The battery cell 100 includes a battery cell main body 110 and a plurality of electrode tabs 120. The plurality of electrode tabs 120 are connected to the same end of the battery cell main body 110, and the plurality of electrode tabs 120 are bent in the same direction relative to the battery cell main body 110; the heights of the plurality of electrode tabs 120 decrease in sequence along the bending direction, so that the plurality of electrode tabs 120 are stacked in sequence after being bent; the connection piece 200 is welded to the side of the stacked plurality of electrode tabs 120 facing away from the battery cell main body 110, so that the electrode tabs 120 can overlap when being bent, and thus the connection piece 200 and the electrode tabs 120 are welded in the overlapping area, so as to ensure that the connection piece 200 and all the electrode tabs 120 can have good welding quality, improve the current-carrying capacity between the battery cell 100 and the connection piece 200, reduce the heat generation of the battery 10 during charging and discharging, and further improve the performance of the battery 10.

[0086] An embodiment of the present application further provides an electrical device, which includes the battery 10 in any one of the above technical solutions.

[0087] Among them, the electrical device may include, but is not limited to, electronic products, communication devices, transportation tools, etc., such as products such as mobile phones, computers, and new energy vehicles. The embodiments of the present application do not make specific limitations thereto.

[0088] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0089] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0090] The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0091] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery (10), characterized in that: The battery (10) comprises a battery cell (100) and a transfer plate (200), wherein the battery cell (100) comprises a battery cell body (110) and a plurality of pole tabs (120), wherein the plurality of pole tabs (120) are connected to the same end of the battery cell body (110), and the plurality of pole tabs (120) are bent in the same direction relative to the battery cell body (110); the heights of the plurality of pole tabs (120) decrease in sequence along the bending direction, so that the plurality of pole tabs (120) are stacked in sequence after being bent; and the transfer plate (200) is welded to a side of the plurality of pole tabs (120) stacked and facing away from the battery cell body (110).

2. The battery (10) according to claim 1, characterized in that: The top edges of the plurality of pole tabs (120) are arranged flush after being bent.

3. The battery (10) according to claim 1, characterized in that: The bent top edges of the plurality of pole tabs (120) are all located within the projection range of the top surface of the battery cell body (110) in the vertical direction.

4. The battery (10) according to claim 1, characterized in that The heights of the plurality of pole tabs (120) are arranged in an arithmetic progression along their arrangement direction.

5. The battery (10) according to any one of claims 1 to 4, characterized in that: The pole lug (120) comprises a connecting section (121) and a bending section (122); the connecting section (121) is connected to the battery cell body (110), and the bending section (122) is connected to an end of the connecting section (121) away from the battery cell body (110); when the pole lug (120) is bent, the connecting section (121) is vertically arranged relative to the battery cell body (110), and the bending section (122) is bent relative to the connecting section (121).

6. The battery (10) according to claim 5, characterized in that The electrode tab (120) comprises a positive electrode tab (120a) and a negative electrode tab (120b); wherein, when the positive electrode tab (120a) is bent, the connection position between the connecting section (121) and the bending section (122) is arc-shaped transition; and when the negative electrode tab (120b) is bent, the connecting section (121) and the bending section (122) are vertically arranged.

7. The battery (10) according to claim 5, characterized in that A folding section is provided between the connecting section (121) and the bending section (122), and the folding section is folded in a direction opposite to the bending of the bending section (122) relative to the connecting section (121).

8. The battery (10) according to any one of claims 1 to 4, characterized in that: The adapter sheet (200) has a welding area (201) on one side facing away from the pole tab (120), and the welding area (201) at least covers the areas where a plurality of pole tabs (120) overlap in the vertical direction after being bent.

9. The battery (10) according to claim 8, characterized in that The adapter sheet (200) is configured to penetrate and weld with the pole tab (120) downward from a side away from the pole tab (120); the plurality of pole tabs (120) have M layers after being bent, and the number of layers of the pole tab (120) penetrated and welded by the adapter sheet (200) is N layers, wherein N≤M-1.

10. The battery (10) according to any one of claims 1 to 4, characterized in that: The battery (10) further comprises an outer shell and a top cover assembly (300), wherein the battery cell (100) is arranged in the outer shell; the top cover assembly (300) is arranged on top of the outer shell and is sealed to the outer shell; the top cover assembly (300) comprises a pole (330), and the pole (330) is welded to the adapter (200).

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