Battery

Abstract

The utility model provides a battery, and relates to the technical field of batteries. The battery comprises a battery cell and an adapter plate, the battery cell comprises a battery cell main body and a tab, the tab is connected with the battery cell main body, and the tab is bent relative to the battery cell main body; the adapter sheets are welded on one sides, deviating from the battery cell main body, of the tabs; the side, deviating from the tab, of the adapter piece is provided with a welding area, and the welding mark between the adapter piece and the tab at least partially covers the welding area, so that the coverage area of the welding mark is increased, the welding reliability between the adapter piece and the tab of the battery cell is improved, the overcurrent capacity between the battery cell and the adapter piece is improved, and the service life of the battery cell is prolonged. The heating value of the battery in the charging and discharging process is reduced, and 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, wherein the pole of the battery cell and the metal adapter are usually welded together.

[0004] However, the welding area between the tab of the battery cell and the metal adapter in the current battery is small, resulting in insufficient current flow capacity between the battery cell and the metal adapter. 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 welding mark area between the electrode tab of the battery cell and the metal adapter in the current battery is small, 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 adapter, the battery cell includes a battery cell body and a pole ear, the pole ear is connected to the battery cell body, and the pole ear is bent relative to the battery cell body; the adapter is welded to the side of the pole ear away from the battery cell body; the side of the adapter away from the pole ear has a welding area, and the weld mark between the adapter and the pole ear at least partially covers the welding area.

[0007] In the battery provided in the present application, by welding the adapter plate to the bent pole ear, a larger welding area is provided between the adapter plate and the pole ear, thereby increasing the coverage area of ​​the weld mark. While improving the welding reliability between the adapter plate and the pole ear of the battery cell, the current carrying capacity between the battery cell and the adapter plate is improved, the heat generated by the battery during the charging and discharging process is reduced, and the battery performance is improved.

[0008] As an optional implementation, there may be multiple pole tabs, and the multiple pole tabs are bent in the same direction relative to the battery cell body; and the multiple pole tabs are stacked in sequence.

[0009] Such an arrangement enables a plurality of tabs to be cut and stacked together, and the welding area on the adapter sheet covers all the tabs, thereby increasing the welding area between the adapter sheet and the tabs.

[0010] As an optional implementation, a plurality of pole tabs are arranged in sequence and spaced apart from one end of the battery cell body along the bending direction of the pole tabs.

[0011] With such arrangement, after the multiple tabs are bent, their tops are sequentially offset, so that the adapter has a larger welding area during welding.

[0012] As an optional implementation, the projection of the welding area in the vertical direction can cover multiple tabs at the same time.

[0013] Such an arrangement can improve the welding reliability between the adapter and the tab.

[0014] As an optional implementation, the projection of the pole tab in the vertical direction is located within the projection range of the battery cell body in the vertical direction.

[0015] This arrangement prevents the battery cell tabs from contacting other external components after being bent, causing a short circuit.

[0016] As an optional implementation, the battery may include two battery cells, and the tabs of the two battery cells are bent toward each other; the adapter has at least two welding areas, and the tabs of the two battery cells are respectively provided with different welding areas.

[0017] With such an arrangement, the tabs of the two battery cells can be welded to the adapter sheet at the same time and have a larger welding area.

[0018] As an optional implementation, the weld mark may include a plurality of welding segments, and the plurality of welding segments are sequentially spaced apart along the length direction of the top end surface of the battery cell; and the plurality of welding segments are sequentially connected end to end.

[0019] Such an arrangement can increase the proportion of the weld print area in the welding zone and improve the current flow capacity between the adapter and the tab.

[0020] As an optional implementation, the welding area is provided with a plurality of welding marks, and the plurality of welding marks are arranged alternately.

[0021] With such an arrangement, the weld marks can cover different areas of multiple tabs, thereby improving the welding reliability between the adapter and the tabs.

[0022] As an optional embodiment, the electrode tab may include a positive electrode tab and a negative electrode tab, the adapter plate includes a positive electrode adapter plate and a negative electrode adapter plate, the positive electrode tab and the negative electrode tab are connected to the same end of the battery cell body, the positive electrode adapter plate is welded to the positive electrode tab, and the negative electrode adapter plate is welded to the negative electrode tab.

[0023] Such an arrangement can ensure that both the positive and negative electrodes of the battery cell have good current-carrying capacity.

[0024] As an optional embodiment, the battery cell may further include an insulating film, which is coated on the outside of the battery cell; at least part of the insulating film is bonded to the top of the battery cell body, and at least part of the insulating film bonded to the top of the battery cell body is bonded to the surface of the adapter sheet facing away from the battery cell body.

[0025] With such arrangement, the insulating film can fix the bent pole ear and the adapter welded to the pole ear, thereby preventing the rebound pole ear from warping up after bending.

[0026] The present application provides a battery, which includes a battery cell and an adapter, the battery cell includes a battery cell body and a pole ear, the pole ear is connected to the battery cell body, and the pole ear is bent relative to the battery cell body; the adapter is welded to the side of the pole ear away from the battery cell body; the side of the adapter away from the pole ear has a welding area, the weld mark between the adapter and the pole ear at least partially covers the welding area, thereby increasing the coverage area of ​​the weld mark, while improving the welding reliability between the adapter and the pole ear of the battery cell, improving the current flow capacity between the battery cell and the adapter, reducing the heat generated by the battery during charging and discharging, and improving the battery performance.

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

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0030] Figure 2 for Figure 1 A top view of

[0031] Figure 3 A schematic diagram of the structure of a battery cell in a battery provided in an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the connection between the battery cell and the adapter in the battery provided in the embodiment of the present application Figure 2 ;

[0033] Figure 5 for Figure 4 A top view of

[0034] Figure 6 A schematic diagram of the structure of a top cover assembly in a battery provided in an embodiment of the present application;

[0035] Figure 7 An exploded view of a top cover assembly in a battery provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 10-Battery;

[0038] 100 - battery cell; 110 - battery cell body; 120 - pole ear; 120a - positive pole ear; 120b - negative pole ear; 130 - insulating film;

[0039] 200- adapter; 200a- positive electrode adapter; 200b- negative electrode adapter; 201- welding area; 210- welding mark; 211- welding section;

[0040] 300-top cover assembly; 301-liquid injection hole; 310-lower plastic; 320-metal sheet; 330-pole; 340-upper plastic; 350-sealing ring; 360-explosion-proof valve. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Batteries are widely used in various power supply devices, including consumer electronics, new energy vehicles, and energy storage devices. Batteries have different sizes and structures depending on the application scenario, and the battery shell can be made of different materials. At present, the battery shell is provided with a battery cell, and a mounting opening is provided on the shell. A top cover with a pole can be covered on the mounting opening. The pole is electrically connected to the pole ear of the battery cell through a metal adapter, wherein the pole ear of the battery cell and the metal adapter are usually welded.

[0043] However, the welding area of ​​the battery cell tabs and the metal adapter is currently small, resulting in insufficient current capacity between the battery cell and the metal adapter, which can easily cause the battery to overheat during the battery's charge and discharge process. Therefore, the current welding method and process of the battery cell tabs and the adapter poses a potential safety risk to the battery.

[0044] The present application provides a battery, which achieves a larger welding area between the adapter and the pole ear by welding the adapter and the bent pole ear, thereby increasing the coverage area of ​​the weld mark, improving the welding reliability between the adapter and the pole ear of the battery cell, and improving the current flow capacity between the battery cell and the adapter, thereby reducing the heat generated by the battery during the charge and discharge process and improving the battery performance.

[0045] The battery of the embodiment of the present application is described below in conjunction with the accompanying drawings. It should be noted that the battery provided in the embodiment of the present application can be a secondary battery, that is, the battery in the embodiment of the present application can be charged and discharged and recycled, and the specific type of the battery can include but is not limited to lithium batteries, lithium cobalt oxide batteries, lithium iron phosphate batteries, ternary batteries, etc., and the battery and the scene in which the battery can be used include but are not limited to electronic products, communication equipment, transportation, etc., such as mobile phones, computers, new energy vehicles and other products, and the embodiment of the present application does not specifically limit this.

[0046] Figure 1 Schematic diagram of the connection between the battery cell and the adapter in the battery provided in the embodiment of the present application Figure 1 ; Figure 2 for Figure 1 A top view of Figure 3 A schematic diagram of the structure of a battery cell in a battery provided in an embodiment of the present application; Figure 4 Schematic diagram of the connection between the battery cell and the adapter in the battery provided in the embodiment of the present application Figure 2 ; Figure 5 for Figure 4 Top view of the .

[0047] Please refer to Figures 1 to 5 The embodiment of the present application provides a battery 10, which includes a battery cell 100 and a transfer sheet 200. The battery cell 100 includes a battery cell body 110 and a tab 120. The tab 120 is connected to the battery cell body 110, and the tab 120 is bent relative to the battery cell body 110.

[0048] The adapter 200 is welded to the side of the tab 120 away from the battery body 110. The side of the adapter 200 away from the tab 120 has a welding area 201, and the welding mark 210 between the adapter 200 and the tab 120 at least partially covers the welding area 201.

[0049] It is understandable that the battery cell 100 may be a winding core structure formed by winding the pole piece. The pole tab 120 may be located at the top of the battery cell body 110, and the pole tab 120 may be bent before welding the adapter 200. Before the pole tab 120 is bent, the pole tab 120 is vertically arranged at the top of the battery cell body 110, and after the pole tab 120 is bent, the pole tab 120 is bent in a horizontal direction relative to the battery cell body 110. The adapter 200 is located above the pole tab 120 and is welded to the pole tab 120 by a penetration welding process.

[0050] It should be noted that the battery 10 provided in the embodiment of the present application welds the adapter 200 to the bent pole ear 120 so that a larger welding area 201 is provided between the adapter 200 and the pole ear 120, thereby increasing the coverage area of ​​the weld mark 210. While improving the welding reliability between the adapter 200 and the pole ear 120 of the battery cell 100, the current carrying capacity between the battery cell 100 and the adapter 200 is improved, the heat generated by the battery 10 during the charging and discharging process is reduced, and the performance of the battery 10 is improved.

[0051] Please refer to Figures 1 to 5 In a possible implementation, there can be multiple pole tabs 120, and the multiple pole tabs 120 are bent in the same direction relative to the battery body 110. The multiple pole tabs 120 are stacked in sequence so that the multiple pole tabs 120 are cut and stacked together, and the welding area 201 on the adapter 200 covers all the pole tabs 120, thereby increasing the area of ​​the weld mark 210 between the adapter 200 and the pole tab 120.

[0052] It is understandable that after the battery cell 100 is wound and formed, the multiple tabs 120 are arranged from the inside to the outside of the winding core, that is, arranged from the center to the outside in sequence, on the top of the battery cell body 110. Since the tabs 120 are bent before the adapter 200 and the tabs 120 are welded, the multiple tabs 120 are not welded and fixed when bent, and the multiple tabs 120 can be cut and stacked together in the same direction after being bent.

[0053] In some embodiments, the plurality of tabs 120 are arranged in sequence and spaced apart from one end of the battery cell body 110 along the bending direction of the tabs 120 .

[0054] It can be understood that after the multiple tabs 120 are bent, the tops thereof are sequentially offset, so that the adapter plate 200 has a larger welding area 201 during welding.

[0055] Exemplarily, the heights of the multiple pole tabs 120 at the top of the battery cell body 110 are equal or approximately equal. Since the pole tabs 120 are arranged in sequence from the inside to the outside of the battery cell 100, after the multiple pole tabs 120 are bent in the same direction, the top boundaries of the bent parts will be arranged in sequence from the inside to the outside of the battery cell 100. In this way, when the adapter 200 is welded, its welding area 201 can cover multiple pole tabs 120 at the same time, that is, at least a portion of the top area of ​​each pole tab 120 can be directly welded to the adapter 200.

[0056] Among them, the inner side of the battery cell 100 refers to the starting end of the electrode sheet when the battery cell 100 is wound, 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 when the battery cell 100 is wound, that is, the outer layer of the wound battery cell 100.

[0057] It should be noted that in the embodiment of the present application, since the pole tab 120 of the battery cell 100 is first subjected to a bending process before being welded to the adapter sheet 200, the space occupied by the pole tab 120 after bending can be greatly reduced. Accordingly, after the adapter sheet 200 is welded to the pole tab 120, the adapter sheet 200 can be closer to the top of the battery cell body 110. This is beneficial to the proportion of the space occupied by the battery cell 100 in the battery 10, thereby improving the energy density of the battery 10.

[0058] In some embodiments, the projection of the welding area 201 in the vertical direction can cover a plurality of tabs 120 at the same time, thereby improving the welding reliability between the adapter 200 and the tab 120 .

[0059] It is understandable that the projection of the tab 120 in the vertical direction is within the projection range of the battery cell body 110 in the vertical direction, thereby preventing the tab 120 of the battery cell 100 from contacting other external components after being bent and causing a short circuit.

[0060] In the battery 10 provided in the embodiment of the present application, there may be multiple battery cells 100, and the tabs 120 of the multiple battery cells 100 may be welded to the adapter 200 at the same time. The number of battery cells 100 may be two or more, and two battery cells 100 are used as an example for exemplary description below.

[0061] In a possible implementation, the battery 10 may include two battery cells 100, and the tabs 120 of the two battery cells 100 are bent toward each other. The adapter 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 200 at the same time and have a larger weld mark 210 area.

[0062] It is understandable that the two battery cells 100 can be arranged side by side, and the tab 120 of the first battery cell 100 is bent toward the second battery cell 100, that is, the tab 120 of the first battery cell 100 is bent toward the middle of the two battery cells 100, and the tab 120 of the second battery cell 100 is bent toward the first battery cell 100, that is, the tab 120 of the second battery cell 100 is bent toward the middle of the two battery cells 100. In this way, the tabs 120 of the two battery cells 100 can be closer after being bent, so that the adapter sheet 200 can more easily cover the tabs 120 of the two battery cells 100, and the surface of the adapter sheet 200 can be fully utilized.

[0063] In some embodiments, the weld mark 210 may include a plurality of weld segments 211, and the plurality of weld segments 211 are sequentially arranged at intervals along the length direction of the top end surface of the battery cell 100. The plurality of weld segments 211 may be sequentially connected end to end. In this way, the area proportion of the weld mark 210 may be increased in the welding area 201, and the current carrying capacity between the adapter 200 and the tab 120 may be improved.

[0064] The length direction of the battery cell 100 is defined as the X direction, the width direction of the battery cell 100 is defined as the Y direction, and the height direction of the battery cell 100 is defined as the Z direction. The tab 120 is located at the top of the battery cell 100 along the Z direction, and the plane where the welding area 201 is located is a plane parallel to the XY plane.

[0065] It is understandable that the plurality of welding segments 211 are sequentially arranged at intervals along the X direction. The plurality of welding segments 211 are sequentially connected end to end so that the welding marks 210 can be sequentially formed through a single welding process, thereby improving welding efficiency.

[0066] Exemplarily, the welding segment 211 may extend along the Y direction, and the multiple welding segments 211 are parallel to each other. The welding area 201 may be a square area on the surface of the adapter 200, and the boundary of the welding area 201 may be the boundary of the area formed by the multiple welding segments 211. For example, the short side of the welding area 201 may extend along the Y direction, and the two short sides of the welding area 201 respectively correspond to the two welding segments 211 located at the head and tail positions of the multiple welding segments 211 arranged along the X direction; the long side of the welding area 201 may extend along the X direction, and the long side of the welding area 201 corresponds to the connection line of the ends of the multiple welding segments 211.

[0067] In some embodiments, the welding area 201 is provided with a plurality of welding marks 210 , and the plurality of welding marks 210 are staggered. The welding marks 210 can cover different areas of a plurality of tabs 120 , thereby improving the welding reliability between the adapter 200 and the tabs 120 .

[0068] It is understandable that the positions of the multiple weld marks 210 can be adjusted according to the shape of the welding area 201 to ensure that the weld marks 210 occupy a larger area in the welding area 201 and improve the current flow capacity between the adapter 200 and the tab 120.

[0069] For example, the welding area 201 may be square, and each welding area 201 may be provided with two welding marks 210, and the welding mark 210 may extend from one corner of the welding area 201 to the diagonal position of the welding area 201. The two welding marks 210 may form an "X"-shaped structure.

[0070] Please continue to refer to Figures 1 to 5 In one possible implementation, the electrode tab 120 may include a positive electrode tab 120a and a negative electrode tab 120b, the adapter sheet 200 includes a positive electrode adapter sheet 200a and a negative electrode adapter sheet 200b, the positive electrode tab 120a and the negative electrode tab 120b are connected to the same end of the battery cell body 110, the positive electrode adapter sheet 200a is welded to the positive electrode tab 120a, and the negative electrode adapter sheet 200b is welded to the negative electrode tab 120b.

[0071] It can be understood that before the positive electrode connecting sheet and the negative electrode connecting sheet are welded to the positive electrode ear 120a and the negative electrode ear 120b, the negative electrode ear 120b and the positive electrode ear 120a can be bent. When the positive electrode connecting sheet is welded to the positive electrode ear 120a and the negative electrode connecting sheet is welded to the negative electrode ear 120b, the area of ​​the weld mark 210 can be increased, thereby ensuring that both the positive and negative electrodes of the battery cell 100 have good current carrying capacity.

[0072] In some embodiments, the battery cell 100 may further include an insulating film 130, which is coated on the outside of the battery cell 100; at least a portion of the insulating film 130 is bonded to the top of the battery cell body 110, and the insulating film 130 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.

[0073] It is understandable that the insulating film 130 can fix the bent tab 120 and the adapter 200 welded to the tab 120 to prevent the bent tab 120 from warping.

[0074] Exemplarily, the material of the insulating film 130 may be a tough polyester polymer material having good flexibility and high temperature resistance.

[0075] Figure 6 A schematic diagram of the structure of a top cover assembly in a battery provided in an embodiment of the present application; Figure 7 An exploded view of a top cover assembly in a battery provided in an embodiment of the present application.

[0076] Please refer to Figures 1 to 7In some embodiments, the battery 10 provided in the embodiment of the present application may further include a top cover assembly 300 and a shell, the shell having a receiving cavity, the battery cell 100 may be placed in the receiving cavity after the adapter sheet 200 is welded, and the top cover assembly 300 may be covered on top of the shell and sealed with the shell.

[0077] The top cover assembly 300 may include a lower plastic 310, a metal sheet 320, a pole 330, 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.

[0078] 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.

[0079] 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.

[0080] It should be noted that the top cover assembly 300 may be provided with a mounting hole, and the explosion-proof valve 360 ​​may be disposed on the mounting hole. The explosion-proof valve 360 ​​may include an explosion-proof sheet and a protective sheet, and the explosion-proof valve 360 ​​is used to release pressure from the battery 10 when the internal pressure of the battery 10 is too high.

[0081] The embodiment of the present application provides a battery 10, which includes a battery cell 100 and an adapter 200. The battery cell 100 includes a battery cell body 110 and a pole tab 120. The pole tab 120 is connected to the battery cell body 110, and the pole tab 120 is bent relative to the battery cell body 110; the adapter 200 is welded to the side of the pole tab 120 away from the battery cell body 110; the side of the adapter 200 away from the pole tab 120 has a welding area 201, and the weld mark 210 between the adapter 200 and the pole tab 120 at least partially covers the welding area 201, thereby increasing the coverage area of ​​the weld mark 210, while improving the welding reliability between the adapter 200 and the pole tab 120 of the battery cell 100, and improving the current flow capacity between the battery cell 100 and the adapter 200, reducing the heat generated by the battery 10 during the charging and discharging process, and improving the performance of the battery 10.

[0082] An embodiment of the present application further provides an electrical device, which includes the battery 10 in any of the above technical solutions.

[0083] Among them, electrical equipment may include but is not limited to electronic products, communication equipment, transportation vehicles, etc., such as mobile phones, computers, new energy vehicles and other products, and the embodiments of the present application do not make specific limitations on this.

[0084] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0085] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0086] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0087] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, 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 the present application.

Claims

1. A battery (10), characterized in that: The battery (10) comprises a battery cell (100) and a transfer sheet (200), wherein the battery cell (100) comprises a battery cell body (110) and a pole lug (120), wherein the pole lug (120) is connected to the battery cell body (110), and the pole lug (120) is bent relative to the battery cell body (110); the transfer sheet (200) is welded to a side of the pole lug (120) facing away from the battery cell body (110); the side of the transfer sheet (200) facing away from the pole lug (120) has a welding area (201), and a weld mark (210) between the transfer sheet (200) and the pole lug (120) at least partially covers the welding area (201).

2. The battery (10) according to claim 1, characterized in that: There are a plurality of pole tabs (120), and the plurality of pole tabs (120) are bent in the same direction relative to the battery core body (110); and the plurality of pole tabs (120) are stacked in sequence.

3. The battery (10) according to claim 2, characterized in that The ends of the plurality of pole tabs (120) away from the battery cell body (110) are arranged in sequence and spaced apart along the bending direction of the pole tabs (120).

4. The battery (10) according to claim 2, characterized in that: The projection of the welding area (201) in the vertical direction covers a plurality of the electrode tabs (120) at the same time.

5. The battery (10) according to any one of claims 1 to 4, characterized in that: The projection of the pole lug (120) in the vertical direction is located within the projection range of the battery cell body (110) in the vertical direction.

6. The battery (10) according to any one of claims 1 to 4, characterized in that: The battery (10) comprises two battery cells (100), and the pole tabs (120) of the two battery cells (100) are bent towards each other; the adapter sheet (200) has at least two welding areas (201), and the pole tabs (120) of the two battery cells (100) are respectively provided with different welding areas (201).

7. The battery (10) according to any one of claims 1 to 4, characterized in that: The weld mark (210) comprises a plurality of weld segments (211), wherein the plurality of weld segments (211) are sequentially arranged at intervals along the length direction of the top end surface of the battery core (100); and the plurality of weld segments (211) are sequentially connected end to end.

8. The battery (10) according to any one of claims 1 to 4, characterized in that: The welding area (201) is provided with a plurality of welding marks (210), and the plurality of welding marks (210) are arranged in an alternating manner.

9. The battery (10) according to any one of claims 1 to 4, characterized in that: The pole lug (120) comprises a positive pole lug (120a) and a negative pole lug (120b); the adapter sheet (200) comprises a positive pole adapter sheet (200a) and a negative pole adapter sheet (200b); the positive pole lug (120a) and the negative pole lug (120b) are connected to the same end of the battery cell body (110); the positive pole adapter sheet (200a) is welded to the positive pole lug (120a); and the negative pole adapter sheet (200b) is welded to the negative pole lug (120b).

10. The battery (10) according to any one of claims 1 to 4, characterized in that: The battery cell (100) further comprises an insulating film (130), wherein the insulating film (130) is coated on the outside of the battery cell (100); at least a portion of the insulating film (130) is bonded to the top of the battery cell body (110), and at least a portion of the insulating film (130) bonded to the top of the battery cell body (110) is bonded to the surface of the adapter sheet (200) on a side facing away from the battery cell body (110).

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