Battery monomer, battery, electric equipment and adapter

Abstract

The embodiment of the utility model provides a battery monomer, a battery, electric equipment and an adapter. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and an adapter. The shell comprises a first wall; the electrode terminal is arranged on the first wall; the electrode assembly is arranged in the shell and is provided with a tab; the adapter comprises a body part and a protruding part, the body part is connected with the electrode lug, the protruding part comprises a top wall and a side wall, the side wall is arranged around the top wall in a surrounding mode, the side wall is connected with the top wall and the body part, and the top wall is welded to the electrode terminal; wherein the thickness of the top wall is smaller than that of the body part. According to the technical scheme provided by the invention, the battery monomer can give consideration to relatively high charge-discharge cycle performance and relatively high reliability.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell, a battery, an electrical device, and an adapter. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is an important factor related to their development.

[0003] During the manufacturing process of batteries, the charge-discharge cycle performance and reliability of batteries are issues that cannot be ignored. Therefore, how to balance the charge-discharge cycle performance and reliability of batteries is a technical problem that urgently needs to be solved in battery technology. Summary of the Utility Model

[0004] The present application provides a battery cell, a battery, an electrical device, and an adapter, which can enable the battery cell to balance high charge-discharge cycle performance and high reliability.

[0005] The present application is implemented through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery cell, which includes a housing, an electrode terminal, an electrode assembly, and an adapter. The housing includes a first wall; the electrode terminal is disposed on the first wall; the electrode assembly is disposed inside the housing, and the electrode assembly has a tab; the adapter includes a body portion and a protruding portion, the body portion is connected to the tab, the protruding portion includes a top wall and a side wall, the side wall surrounds the top wall, the side wall connects the top wall and the body portion, and the top wall is welded to the electrode terminal; wherein, the thickness of the top wall is less than the thickness of the body portion.

[0007] According to the battery cell of the embodiment of the present application, the thickness of the top wall of the protruding portion is designed to be less than the thickness of the body portion. The body portion is thicker and the top wall is thinner. The body portion has better current-carrying capacity, and the top wall and the electrode terminal have better welding effect, so that the battery cell has high charge-discharge cycle performance and high reliability.

[0008] According to some embodiments of the present application, the top wall is provided with a groove or a first through hole.

[0009] In the above solution, due to the setting of the groove or the first through hole, the adapter can be formed by stamping, which is convenient for the flow of materials, so that the thickness of the top wall is less than the thickness of the body portion.

[0010] According to some embodiments of the present application, the top wall and the electrode terminal are welded to form a welding area, and the welding area surrounds the groove or the first through hole.

[0011] In the above solution, the welding area is arranged around the groove or the first through hole, reasonably utilizing the space of the top wall, so that the top wall and the electrode terminal have a large connection area, facilitating firm welding between the top wall and the electrode terminal.

[0012] According to some embodiments of the present application, along the thickness direction of the first wall, the projection of the center of the welding area is within the first through hole, and the difference between the inner diameter of the welding area and the diameter of the first through hole is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0013] In the above solution, the first through hole and the welding area satisfy the above relationship, which can determine the position of the welding area, facilitating both the welding between the top wall and the electrode terminal and enabling the welding area to have a large area, making the connection between the top wall and the electrode terminal firm.

[0014] According to some embodiments of the present application, the thickness of the top wall is greater than or equal to 0.4 mm and less than or equal to 2.2 mm.

[0015] In the above solution, the thickness of the top wall satisfies the above relationship, enabling the adapter and the electrode terminal to have a high current-carrying capacity and facilitating the welding connection between the top wall and the electrode terminal.

[0016] According to some embodiments of the present application, the thickness of the body portion is greater than or equal to 0.6 mm and less than or equal to 1.5 mm, and the thickness of the top wall is greater than or equal to 0.4 mm and less than or equal to 1.3 mm; or, the thickness of the body portion is greater than or equal to 1.5 mm and less than or equal to 2.5 mm, and the thickness of the top wall is greater than or equal to 1.3 mm and less than or equal to 2.2 mm.

[0017] In the above solution, when the thickness of the body portion is relatively thin (such as greater than or equal to 0.6 mm and less than or equal to 1.5 mm), the thickness of the top wall can be relatively thin (such as greater than or equal to 0.4 mm and less than or equal to 1.3 mm); when the thickness of the body portion is relatively thick (such as greater than or equal to 1.5 mm and less than or equal to 2.5 mm), the thickness of the top wall can be relatively thick (such as greater than or equal to 1.3 mm and less than or equal to 2.2 mm). The thickness of the top wall satisfies the above relationship according to the thickness of the body portion. On the one hand, the body portion has a strong current-carrying capacity, and on the other hand, the welding process difficulty between the top wall and the electrode terminal is relatively low.

[0018] According to some embodiments of the present application, the material of the adapter is aluminum, and the thickness of the body portion is greater than or equal to 0.6 mm and less than or equal to 2.5 mm; or, the material of the adapter is copper, and the thickness of the body portion is greater than or equal to 0.6 mm and less than or equal to 2 mm.

[0019] In the above solution, when the material of the adapter is aluminum, the thickness of the body part is 0.6 mm to 2.5 mm. On the one hand, the current-carrying capacity is relatively strong. On the other hand, when the adapter is integrally formed to manufacture the protruding part (such as the top wall of the protruding part formed by stamping and thinning the sheet), the manufacturing difficulty is relatively low. When the material of the adapter is copper, the thickness of the body part is 0.6 mm to 2 mm. On the one hand, the current-carrying capacity is relatively strong. On the other hand, when the adapter is integrally formed to manufacture the protruding part (such as the top wall of the protruding part formed by stamping and thinning the sheet), the manufacturing difficulty is relatively low.

[0020] According to some embodiments of the present application, the ratio of the thickness of the body part to the thickness of the top wall is greater than or equal to 1.2 and less than or equal to 2.

[0021] In the above solution, when the ratio of the thickness of the body part to the thickness of the top wall satisfies the above relationship, it can take into account both a relatively high current-carrying capacity and the requirements for good welding stability between the top wall and the electrode terminal.

[0022] According to some embodiments of the present application, the thickness of the top wall is less than the thickness of the side wall.

[0023] In the above solution, the thickness of the top wall is less than the thickness of the side wall, which is convenient for integral forming, and the protruding part has relatively high strength.

[0024] According to some embodiments of the present application, a protrusion is formed on the side of the top wall facing the electrode assembly.

[0025] In the above solution, the adapter can be formed by stamping, and the protrusion is formed by material flow molding so that the thickness of the top wall is less than the thickness of the body part.

[0026] According to some embodiments of the present application, the top wall and the electrode terminal are welded to form a welding area, and the welding area is arranged around the protrusion.

[0027] In the above solution, the welding area is arranged around the protrusion, reasonably utilizing the space of the top wall, so that the top wall and the electrode terminal have a relatively large connection area, which is convenient for firmly welding the top wall and the electrode terminal.

[0028] According to some embodiments of the present application, the first wall is provided with a second through hole, and a part of the protruding part extends into the second through hole so that the top wall and the electrode terminal can be welded.

[0029] In the above solution, the setting of the second through hole facilitates the connection between the top wall and the electrode terminal.

[0030] According to some embodiments of the present application, the battery cell further includes a first insulating member, and at least a part of the first insulating member is arranged between the hole wall of the second through hole and the protruding part.

[0031] In the above solution, the setting of the first insulating member can isolate the protruding part from the first wall to reduce the risk of short circuit between the positive and negative electrodes.

[0032] According to some embodiments of the present application, the battery cell further includes a second insulating member. Along the thickness direction of the first wall, at least a part of the second insulating member is disposed between the first wall and the body portion; the second insulating member is provided with a third through hole corresponding to the second through hole, and a part of the protruding portion extends into the third through hole.

[0033] In the above solution, the arrangement of the second insulating member can isolate the adapter from the first wall and reduce the risk of short circuit due to contact between the positive and negative electrodes. The arrangement of the third through hole facilitates the connection between the top wall and the electrode terminal.

[0034] In a second aspect, an embodiment of the present application further provides a battery, which includes the battery cell provided in any one of the above embodiments.

[0035] In a third aspect, an embodiment of the present application further provides an electrical device, which includes the battery cell or the battery provided in any one of the above embodiments, and the battery cell or the battery is used to provide electrical energy.

[0036] In a fourth aspect, an embodiment of the present application further provides an adapter, which includes: a body portion and a protruding portion. The body portion is used to connect with the tab of the battery cell; the protruding portion includes a top wall and a side wall. The side wall surrounds the top wall, and the side wall connects the top wall and the body portion. The top wall is used to be welded to the electrode terminal of the battery cell; wherein, the thickness of the top wall is less than the thickness of the body portion.

[0037] For the adapter according to the embodiment of the present application, the thickness of the top wall is less than the thickness of the body portion. The body portion has a relatively large thickness to improve the current-carrying capacity between the adapter and the tab, and the top wall has a relatively small thickness to improve the welding reliability between the adapter and the electrode terminal, so that the battery cell formed by the adapter has high charge and discharge cycle performance and high reliability.

[0038] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 Structural schematic diagram of a vehicle provided for some embodiments of the present application;

[0041] Figure 2Exploded view of the structure of the battery provided by some embodiments of the present application;

[0042] Figure 3 Exploded view of the structure of the battery cell provided by some embodiments of the present application;

[0043] Figure 4 Cross-sectional view of the battery cell provided by some embodiments of the present application;

[0044] Figure 5 For Figure 4 Partial enlarged view of area A;

[0045] Figure 6 Stereogram of the adapter provided by some embodiments of the present application;

[0046] Figure 7 Cross-sectional view of the adapter provided by some embodiments of the present application;

[0047] Figure 8 For Figure 7 Partial enlarged view of area B;

[0048] Figure 9 Schematic diagram of the structure of the welding area provided by some embodiments of the present application;

[0049] Figure 10 Schematic flow chart of the manufacturing method of the battery cell provided by some embodiments of the present application;

[0050] Figure 11 Schematic flow chart of the manufacturing method of the battery cell provided by other embodiments of the present application.

[0051] Icons: 100 - battery; 10 - box body; 11 - first sub-box body; 12 - second sub-box body; 20 - battery cell; 21 - outer shell; 211 - housing; 2111 - second wall; 2112 - third wall; 2113 - fourth wall; 212 - end cap; 213 - first wall; 2131 - second through hole; 22 - electrode assembly; 221 - tab; 221a - positive tab; 221b - negative tab; 23 - electrode terminal; 23a - positive electrode terminal; 23b - negative electrode terminal; 24 - adapter; 24a - positive adapter; 24b - negative adapter; 241 - body portion; 2411 - connecting portion; 242 - protruding portion; 2421 - top wall; 2422 - side wall; 2423 - first through hole; 243 - recess; 25 - welding area; 26 - first insulating member; 27 - second insulating member; 271 - third through hole; 200 - controller; 300 - motor; 1000 - vehicle; J - radial direction of the protruding portion; X - thickness direction of the electrode assembly; Y - second direction; Z - thickness direction of the first wall. Detailed implementation manners

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0054] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0055] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0057] The "multiple" mentioned in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0058] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0059] In some embodiments, the battery may be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0060] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, part of the box body may become at least part of the floor of the vehicle, or part of the box body may become at least part of the crossbeam and longitudinal beam of the vehicle.

[0061] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0063] The battery cell may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0064] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0067] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery can also be used.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. can be used.

[0071] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0072] As an example, the negative electrode active material may be a negative electrode active material for a battery well-known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery can also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0073] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0074] As an example, the main material of the separator membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation. The separator may be a single component located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

[0075] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0076] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0077] In some embodiments, the electrode assembly has a stacked structure.

[0078] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), or a composite metal shell (such as a copper-aluminum composite shell), etc.

[0079] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating substances such as the electrode assembly and the electrolyte. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0080] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap or on the housing body.

[0081] In some embodiments, a pressure relief valve is provided on the housing. The pressure relief valve is used to release the internal pressure of the battery cell.

[0082] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in the embodiments of the present application.

[0083] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, discharge capacity, and assembly efficiency. In addition, the charge and discharge cycle performance and reliability of the battery also need to be considered.

[0084] In some embodiments, a battery cell includes a housing, an electrode terminal, an electrode assembly and an adapter, wherein the electrode terminal is disposed on the housing, and the adapter is used to electrically connect the electrode terminal and the pole ear of the electrode assembly. In order to facilitate the connection between the adapter and the electrode terminal, the adapter may include a body and a protrusion, wherein the body is connected to the pole ear, and the top wall of the protrusion is connected to the electrode terminal. Usually, the body and the protrusion are integrally formed, and the thickness of the body is the same as the thickness of the top wall. The flow capacity of the adapter affects the charge and discharge cycle performance of the battery cell, and therefore, the thicker the thickness of the adapter, the higher the flow capacity of the adapter. However, the top wall is welded to the electrode terminal. If the thickness of the adapter is thick, when the top wall is welded to the electrode terminal, it is easy to have a cold weld, a burst point crack, etc., resulting in a loose connection between the adapter and the electrode terminal, affecting the welding reliability of the adapter and the electrode terminal, thereby affecting the reliability of the battery cell. Therefore, the adapter cannot take into account both the higher flow capacity and the welding reliability requirements with the electrode terminal, so that the battery cell cannot take into account both the higher charge and discharge cycle performance and the higher reliability.

[0085] In view of this, in order to solve the problem that the battery cell cannot take into account both high charge and discharge cycle performance and high reliability, the present application provides a battery cell, which includes a shell, an electrode terminal, an electrode assembly and an adapter. The shell includes a first wall; the electrode terminal is arranged on the first wall; the electrode assembly is arranged in the shell, and the electrode assembly has a pole ear; the adapter includes a body and a protruding part, the body is connected to the pole ear, the protruding part includes a top wall and a side wall, the side wall is arranged around the top wall, the side wall connects the top wall and the body, and the top wall is welded to the electrode terminal; wherein the thickness of the top wall is less than the thickness of the body. The battery cell can take into account both high charge and discharge cycle performance and high reliability.

[0086] In such a battery cell, the thickness of the top wall is thinner than that of the main body, so that the thickness of the main body can be thicker, so as to improve the current carrying capacity between the adapter and the pole ear, and the thickness of the top wall can be thinner, so as to have a better welding effect between the top wall and the electrode terminal. While improving the current carrying capacity of the adapter, the welding reliability between the adapter and the electrode terminal is improved, so that the battery cell has both higher charge and discharge cycle performance and higher reliability.

[0087] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0088] The embodiments of the present application provide an electrical device using a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0089] For the convenience of description, the following embodiments will take a vehicle as an example of an electrical device according to an embodiment of the present application for illustration.

[0090] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, or the like. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 may be used as an operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as the working power requirements for starting, navigating, and running of the vehicle 1000.

[0091] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements of the vehicle 1000 during starting, navigating, and driving.

[0092] In some embodiments of the present application, the battery 100 may not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0093] Please refer to Figure 2 , Figure 2Schematic exploded view of the structure of a battery provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first sub-box body 11 and a second sub-box body 12. The first sub-box body 11 and the second sub-box body 12 cover each other, and the first sub-box body 11 and the second sub-box body 12 jointly define an accommodation space for accommodating the battery cells 20. The second sub-box body 12 may be a hollow structure with one end open, and the first sub-box body 11 may be a plate-like structure. The first sub-box body 11 covers the open side of the second sub-box body 12 so that the first sub-box body 11 and the second sub-box body 12 jointly define an accommodation space; the first sub-box body 11 and the second sub-box body 12 may also both be hollow structures with one side open, and the open side of the first sub-box body 11 covers the open side of the second sub-box body 12.

[0094] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, parallel or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, parallel or in a mixed connection to form a whole and are accommodated in the box body 10. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0095] Among them, the battery cell 20 can be a secondary battery or a primary battery; the battery cell 20 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0096] Please refer to Figure 3 , Figure 3 Schematic exploded view of the structure of a battery cell provided by some embodiments of the present application. As Figure 3 shown, the battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0097] The housing 211 is a component for cooperating with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can be of various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0098] The end cap 212 is a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the housing 211 to cooperate with the housing 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 212 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved reliability. Functional components such as the electrode terminal 23 can be provided on the end cap 212. The electrode terminal 23 can be used to electrically connect with the electrode assembly 22 for outputting or inputting the electrical energy of the battery cell 20. The material of the end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 212, and the insulating structure can be used to isolate the electrical connection components in the housing 211 from the end cap 212 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0099] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The housing 211 can contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and generally an isolation film is provided between the positive electrode plate and the negative electrode plate to separate the positive electrode plate and the negative electrode plate to avoid internal short circuit between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active substances constitute the main body of the electrode assembly, and the parts of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively.

[0100] Please refer to Figure 3 and further refer to Figures 4 to 8 Figure 4 is a cross-sectional view of the battery cell provided by some embodiments of the present application, Figure 5 is Figure 4 a partial enlarged view of the A position of Figure 6 is a perspective view of the adapter provided by some embodiments of the present application, Figure 7 ​A cross-sectional view of the adapter provided by some embodiments of the present application. Figure 8 is Figure 7 A partially enlarged view of portion B of

[0101] Some embodiments of the present application provide a battery cell 20, which includes a housing 21, an electrode terminal 23, an electrode assembly 22, and an adapter 24. The housing 21 includes a first wall 213; the electrode terminal 23 is disposed on the first wall 213; the electrode assembly 22 is disposed within the housing 21, and the electrode assembly 22 has a tab 221; the adapter 24 includes a body portion 241 and a protruding portion 242. The body portion 241 is connected to the tab 221. The protruding portion 242 includes a top wall 2421 and a side wall 2422. The side wall 2422 surrounds the top wall 2421, and the side wall 2422 connects the top wall 2421 and the body portion 241. The top wall 2421 is welded to the electrode terminal 23. Among them, the thickness of the top wall 2421 is less than the thickness of the body portion 241.

[0102] The housing 21 may include a housing body and an end cap. The first wall 213 may be a wall portion of the housing body, or the first wall 213 may be an end cap.

[0103] In some embodiments, the first wall 213 is an end cap, which facilitates the assembly of the electrode terminal 23 and the first wall 213.

[0104] In some embodiments, the first wall 213 is provided with an electrode lead-out hole (such as a second through hole 2131), and the electrode terminal 23 and the adapter 24 are electrically connected through the electrode lead-out hole.

[0105] In some embodiments, an insulating structure may be provided between the electrode terminal 23 and the first wall 213. The insulating structure spaces apart the electrode terminal 23 and the first wall 213 to reduce the risk of positive and negative contact short circuits.

[0106] The adapter 24 is a component for realizing the electrical connection between the tab 221 and the electrode terminal 23. The adapter 24 is a conductive component. For example, the material of the adapter 24 may be a metal, such as copper, aluminum, etc.

[0107] In some embodiments, the electrode terminal 23 includes a positive electrode terminal 23a and a negative electrode terminal 23b. The positive electrode terminal 23a and the negative electrode terminal 23b are spaced apart on the first wall 213; the electrode assembly 22 has a positive tab 221a and a negative tab 221b. The adapter 24 includes a positive adapter 24a and a negative adapter 24b. The positive electrode terminal 23a and the positive tab 221a are electrically connected through the positive adapter 24a, and the negative electrode terminal 23b and the negative tab 221b are electrically connected through the negative adapter 24b. For the convenience of description, when the polarity is not limited, the electrode terminal 23, the tab 221, and the adapter 24 mentioned in the embodiments of the present application are of the same polarity.

[0108] The body part 241 can be the base of the adapter 24. The protruding part 242 can protrude from one side of the body part 241 along the thickness direction of the adapter 24. For example, the body part 241 has a first surface facing away from the electrode assembly 22, and the protruding part 242 protrudes from the first surface. The protruding part 242 protrudes in the direction away from the electrode assembly 22, so as to facilitate the connection between the protruding part 242 and the electrode terminal 23. Wherein, the thickness direction of the adapter 24 can be parallel to the thickness direction Z of the first wall, the thickness direction of the body part 241 can be parallel to the thickness direction of the adapter 24, and the thickness direction of the top wall 2421 can be parallel to the thickness direction of the adapter 24.

[0109] The side wall 2422 surrounds the periphery of the top wall 2421, so that the protruding part 242 is a hollow structure. For example, the adapter 24 is formed with a recess 243 corresponding to the protruding part 242 on the side facing the electrode assembly 22, and the recess 243 can be a groove. The inner surface of the side wall 2422 and the inner surface of the top wall 2421 enclose the recess 243, and the outer surface of the top wall 2421 is welded to the electrode terminal 23.

[0110] In some embodiments, the adapter 24 is formed by stamping a sheet, so as to form the body part 241 and the protruding part 242, and the top wall 2421 is thinned by stamping, so that the thickness of the top wall 2421 is less than the thickness of the body part 241.

[0111] In some embodiments, the protruding part 242 can be cylindrical.

[0112] For the convenience of description, Figure 8 in the figure, the dimension indicated by the letter H1 is the thickness of the body part 241, and the dimension indicated by the letter H2 is the thickness of the top wall 2421.

[0113] The method for detecting the thickness of the top wall 2421 is: disassembling the battery cell 20 and detecting the thickness of the non-welded area of the top wall 2421.

[0114] The material of the adapter 24 is copper, aluminum, stainless steel, titanium alloy, nickel alloy.

[0115] According to the battery cell 20 of the embodiment of the present application, the thickness of the top wall 2421 of the protruding part 242 is designed to be less than the thickness of the body part 241. The body part 241 is thicker and the top wall 2421 is thinner. The body part 241 has better overcurrent capacity, and the top wall 2421 and the electrode terminal 23 have better welding effect, so that the battery cell 20 has higher charge and discharge cycle performance and higher reliability.

[0116] Please refer to Figure 8 , according to some embodiments of the present application, the top wall 2421 is provided with a groove or a first through hole 2423.

[0117] The groove or the first through hole 2423 may be a feature formed after stamping the adapter 24. For example, during the manufacturing process of the adapter 24, a fourth through hole may be first provided on the plate, and then the area within a certain range where the fourth through hole is located is stamped to form a protruding portion 242 whose thickness of the top wall 2421 is less than that of the body portion 241. During the stamping process, due to the flow of the material, the fourth through hole shrinks to form a groove or the first through hole 2423 on the top wall 2421. It should be noted that when the size of the first through hole 2423 is small, it may be a slit.

[0118] The groove may be recessed from one side in the thickness direction of the top wall 2421, or may be recessed from both sides in the thickness direction of the top wall 2421.

[0119] The shape of the first through hole 2423 may be a round hole, a square hole, a triangular hole, an oval hole, etc.

[0120] In the above solution, by providing the groove or the first through hole 2423, the adapter 24 can be stamped, which is convenient for the flow of the material, so that the thickness of the top wall 2421 is less than that of the body portion 241.

[0121] Please refer to Figure 5 and further refer to Figure 9 Figure 9 FIG. 18 is a schematic structural diagram of a welding area provided in some embodiments of the present application. According to some embodiments of the present application, the top wall 2421 and the electrode terminal 23 are welded to form a welding area 25, and the welding area 25 is disposed around the groove or the first through hole 2423.

[0122] The welding area 25 may be a welding mark. In the thickness direction of the adapter 24, the welding area 25 extends from the side of the top wall 2421 facing the electrode assembly 22 to the electrode terminal 23.

[0123] When the top wall 2421 is welded to the electrode terminal 23, the groove or the first through hole 2423 is avoided, so that the groove or the first through hole 2423 is surrounded by the welding area 25, which can improve the welding reliability between the top wall 2421 and the electrode terminal 23.

[0124] In the above solution, the welding area 25 is disposed around the groove or the first through hole 2423, rationally utilizing the space of the top wall 2421, so that the top wall 2421 and the electrode terminal 23 have a large connection area, which is convenient for firmly welding the top wall 2421 and the electrode terminal 23.

[0125] According to some embodiments of the present application, along the thickness direction Z of the first wall, the projection of the center of the welding area 25 is within the through hole, and the difference between the inner diameter of the welding area 25 and the diameter of the first through hole 2423 is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0126] ​In some embodiments, the welding area 25 may be in an annular shape.

[0127] In some embodiments, the center of the first through hole 2423 may overlap with the center of the welding area 25. When the top wall 2421 is provided with the first through hole 2423, the center of the welding area 25 may be the center of the first through hole 2423.

[0128] In some embodiments, the first through hole 2423 may be a round hole.

[0129] In some embodiments, when the first through hole 2423 is in an irregular shape, the diameter of the first through hole 2423 refers to the diameter of the circumscribed circle of the first through hole 2423.

[0130] For ease of description, Figure 9 in, the dimension indicated by the letter D1 is the inner diameter of the welding area 25, and the dimension indicated by the letter D2 is the diameter of the first through hole 2423.

[0131] The difference between the inner diameter of the welding area 25 and the diameter of the first through hole 2423 may be any one of the point values of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the range between any two point values.

[0132] Optionally, the difference between the inner diameter of the welding area 25 and the diameter of the first through hole 2423 may be 1 mm to 2 mm.

[0133] In the above solution, the diameter of the first through hole 2423 and the inner diameter of the welding area 25 satisfy the above relationship, which can determine the position of the welding area 25, facilitating the welding of the top wall 2421 and the electrode terminal 23, and enabling the welding area 25 to have a relatively large area, so that the top wall 2421 and the electrode terminal 23 are firmly connected.

[0134] In some embodiments, the center of the first through hole 2423 may overlap with the center of the top wall 2421.

[0135] In some embodiments, the symmetry of the center of the first through hole 2423 with respect to the center of the top wall 2421 is greater than or equal to 0 and less than or equal to 0.6. The center of the first through hole 2423 may be located at the center of the top wall 2421, or there may be a certain deviation between the center of the first through hole 2423 and the center of the top wall 2421.

[0136] According to some embodiments of the present application, the thickness of the top wall 2421 is greater than or equal to 0.4 mm and less than or equal to 2.2 mm.

[0137] Optionally, the thickness of the top wall 2421 is any one of the point values of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm or the range between any two of the point values.

[0138] In the above solution, the thickness of the top wall 2421 satisfies the above relationship, and there is a high current-carrying capacity between the adapter 24 and the electrode terminal 23, and it is convenient for welding connection between the top wall 2421 and the electrode terminal 23.

[0139] According to some embodiments of the present application, the thickness of the main body portion 241 is greater than or equal to 0.6 mm and less than or equal to 1.5 mm, and the thickness of the top wall 2421 is greater than or equal to 0.4 mm and less than or equal to 1.3 mm; or, the thickness of the main body portion 241 is greater than or equal to 1.5 mm and less than or equal to 2.5 mm, and the thickness of the top wall 2421 is greater than or equal to 1.3 mm and less than or equal to 2.2 mm.

[0140] In some embodiments, the thickness of the main body portion 241 can be any one of the point values of 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or the range between any two of the point values.

[0141] In some embodiments, the thickness of the top wall 2421 is any one of the point values of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm or the range between any two of the point values.

[0142] In some embodiments, the thickness of the main body portion 241 can be any one of the point values of 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm or the range between any two of the point values.

[0143] In some embodiments, the thickness of the top wall 2421 is any one of the point values of 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm or the range between any two of the point values.

[0144] In the above solution, when the thickness of the body portion 241 is relatively thin (such as greater than or equal to 0.6 mm and less than or equal to 1.5 mm), the thickness of the top wall 2421 can be relatively thin (such as greater than or equal to 0.4 mm and less than or equal to 1.3 mm); when the thickness of the body portion 241 is relatively thick (such as greater than or equal to 1.5 mm and less than or equal to 2.5 mm), the thickness of the top wall 2421 can be relatively thick (such as greater than or equal to 1.3 mm and less than or equal to 2.2 mm). The thickness of the top wall 2421 satisfies the above relationship according to the thickness of the body portion 241. On the one hand, the current-carrying capacity of the body portion 241 is strong, and on the other hand, the welding process difficulty between the top wall 2421 and the electrode terminal 23 is low.

[0145] In some embodiments, the thickness of the body portion 241 can be 0.8 mm to 2 mm.

[0146] In some embodiments, the thickness of the top wall 2421 can be 0.6 mm to 1.8 mm.

[0147] According to some embodiments of the present application, the material of the adapter 24 is aluminum, and the thickness of the body portion 241 is greater than or equal to 0.6 mm and less than or equal to 2.5 mm; or, the material of the adapter 24 is copper, and the thickness of the body portion 241 is greater than or equal to 0.6 mm and less than or equal to 2 mm.

[0148] When the material of the adapter 24 is aluminum, the thickness of the body portion 241 can be any one of 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm or the range between any two of these point values.

[0149] When the material of the adapter 24 is copper, the thickness of the body portion 241 can be any one of 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm or the range between any two of these point values.

[0150] In the above solution, when the material of the adapter 24 is aluminum, the thickness of the main body portion 241 is 0.6 mm to 2.5 mm. On the one hand, the current-carrying capacity is relatively strong. On the other hand, when the protruding portion 242 is integrally formed on the adapter 24 (such as the top wall 2421 of the protruding portion 242 formed by stamping and thinning a plate), the processing and manufacturing difficulty is relatively low. When the material of the adapter 24 is copper, the thickness of the main body portion 241 is 0.6 mm to 2 mm. On the one hand, the current-carrying capacity is relatively strong. On the other hand, when the protruding portion 242 is integrally formed on the adapter 24 (such as the top wall 2421 of the protruding portion 242 formed by stamping and thinning a plate), the processing and manufacturing difficulty is relatively low.

[0151] According to some embodiments of the present application, the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 is greater than or equal to 1.2 and less than or equal to 2.

[0152] For example, the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.

[0153] When the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 is relatively large, the thickness of the main body portion 241 can be relatively thick, or the thickness of the top wall 2421 can be relatively thin. When the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 is relatively small, the thickness of the main body portion 241 can be relatively thin, or the thickness of the top wall 2421 can be relatively thick.

[0154] When the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 is greater than or equal to 1.2, the thickness of the main body portion 241 can be relatively thick, and the main body portion 241 has a relatively high current-carrying capacity.

[0155] When the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 is less than or equal to 2, the thickness of the top wall 2421 can be relatively thick, meeting the welding requirements between the top wall 2421 and the electrode terminal 23.

[0156] In the above solution, when the ratio of the thickness of the main body portion 241 to the thickness of the top wall 2421 satisfies the above relationship, it can take into account both a relatively high current-carrying capacity and the welding stability requirements between the top wall 2421 and the electrode terminal 23.

[0157] According to some embodiments of the present application, the thickness of the top wall 2421 is less than the thickness of the side wall 2422.

[0158] In some embodiments, the thickness of the side wall 2422 gradually decreases from the main body portion 241 towards the top wall 2421.

[0159] Since the thickness of the top wall 2421 is less than the thickness of the side wall 2422, the protruding portion 242 can be formed by stamping, and the top wall 2421 can be formed by stamping and thinning.

[0160] The thickness of the side wall 2422 is greater than the thickness of the top wall 2421. When the welding requirements between the top wall 2421 and the electrode terminal 23 are met, the protruding portion 242 can have relatively high overall strength.

[0161] In the above solution, the thickness of the top wall 2421 is less than the thickness of the side wall 2422, which is convenient for integral molding, and the protruding portion 242 has relatively high strength.

[0162] According to some embodiments of the present application, a protrusion (not shown in the figure) is formed on the side of the top wall 2421 facing the electrode assembly 22.

[0163] The protrusion protrudes from the inner surface of the top wall 2421, and the protrusion protrudes toward the electrode assembly 22. The inner surface of the top wall 2421 is the surface of the top wall 2421 facing away from the electrode terminal 23.

[0164] During the manufacturing process of the adapter 24, when the sheet material is subjected to a stamping process, the punch can be provided with a groove. When the punch acts on the area of the sheet material to be stamped, the material flows toward the groove of the punch, forming the protruding portion 242 with the top wall 2421 and the side wall 2422, and a protrusion is formed on the inner surface of the top wall 2421, so that the thickness of the top wall 2421 can be less than the thickness of the body portion 241.

[0165] In the above solution, the adapter 24 can be formed by stamping, and the protrusion is formed by material flow, so that the thickness of the top wall 2421 is less than the thickness of the body portion 241.

[0166] According to some embodiments of the present application, the top wall 2421 and the electrode terminal 23 are welded to form a welding area 25, and the welding area 25 is arranged around the protrusion.

[0167] The welding area 25 is arranged around the protrusion, so that when the top wall 2421 and the electrode terminal 23 are welded, the welding head moves around the protrusion, which is convenient for the top wall 2421 and the electrode terminal 23 to have a relatively large connection area.

[0168] In the above solution, the welding area 25 is arranged around the protrusion, reasonably utilizing the space of the top wall 2421, so that the top wall 2421 and the electrode terminal 23 have a relatively large connection area, which is convenient for the top wall 2421 and the electrode terminal 23 to be welded firmly.

[0169] According to some embodiments of the present application, the side wall 2422 can be inclined relative to the top wall 2421. For example, along the thickness direction of the adapter 24, the diameter of the side wall 2422 gradually decreases from the body portion 241 toward the top wall 2421.

[0170] According to some embodiments of the present application, the battery cell 20 is a square shell battery cell 20, and the outer shell 21 is in a cuboid shape.

[0171] For example, please refer to Figure 3 , the housing 21 includes a housing body 211 and an end cap 212. The housing body 211 includes two second walls 2111 oppositely arranged along a first direction, two third walls 2112 oppositely arranged along a second direction, and a fourth wall 2113. The end cap 212 and the fourth wall 2113 are oppositely arranged along a third direction. The first wall 213 is the end cap 212. The first direction, the second direction Y, and the third direction are perpendicular to each other pairwise. The first direction is parallel to the thickness direction X of the electrode assembly, and the third direction is parallel to the thickness direction Z of the first wall.

[0172] According to some embodiments of the present application, the electrode assembly 22 is flat. The thickness direction X of the electrode assembly is perpendicular to the thickness direction Z of the first wall, and the thickness direction X of the electrode assembly is perpendicular to the thickness direction of the adapter 24.

[0173] According to some embodiments of the present application, the body portion 241 may include two connecting portions 2411. Along the thickness direction X of the electrode assembly, the protruding portion 242 is located between the two connecting portions 2411.

[0174] In some embodiments, the number of the electrode assemblies 22 is four. Two of the electrode assemblies 22 form a group, and the four electrode assemblies 22 are divided into two groups. Among the two groups of electrode assemblies 22, the two tab ears 221 of one group of electrode assemblies 22 are connected to one connecting portion 2411, and the two tab ears 221 of the other group of electrode assemblies 22 are connected to the other connecting portion 2411.

[0175] In some embodiments, the number of the electrode assemblies 22 may also be two. The tab ears 221 of the two electrode assemblies 22 are respectively connected to the two connecting portions 2411.

[0176] Please refer to Figure 5 , according to some embodiments of the present application, the first wall 213 is provided with a second through hole 2131. A part of the protruding portion 242 extends into the second through hole 2131 so that the top wall 2421 is welded to the electrode terminal 23.

[0177] The second through hole 2131 penetrates the first wall 213 along the thickness direction Z of the first wall. The second through hole 2131 connects the outer surface and the inner surface of the first wall 213.

[0178] The diameter of the second through hole 2131 is larger than the diameter (outer diameter) of the protruding portion 242 so that a part of the protruding portion 242 can extend into the second through hole 2131.

[0179] In the above solution, the setting of the second through hole 2131 facilitates the connection between the top wall 2421 and the electrode terminal 23.

[0180] Please refer to Figure 5, according to some embodiments of the present application, the battery cell 20 further includes a first insulating member 26, and at least a part of the first insulating member 26 is disposed between the hole wall of the second through hole 2131 and the protruding portion 242.

[0181] The first insulating member 26 is an insulating component that can insulatively isolate the protruding portion 242 from the first wall 213. The material of the first insulating member 26 can be plastic, rubber, etc.

[0182] In some embodiments, the first insulating member 26 is annular, and the first insulating member 26 is sleeved outside the protruding portion.

[0183] In some embodiments, the first insulating member 26 can be bonded to the hole wall of the second through hole 2131.

[0184] In some embodiments, along the radial direction J of the protruding portion, the first insulating member 26 can be entirely located between the hole wall of the second through hole 2131 and the protruding portion 242.

[0185] In some embodiments, along the radial direction J of the protruding portion, a part of the first insulating member 26 can be located between the hole wall of the second through hole 2131 and the protruding portion 242, and along the thickness direction Z of the first wall, another part of the first insulating member 26 can be located between the electrode terminal 23 and the first wall 213. Wherein, the first insulating member 26 can be bonded to the first wall 213.

[0186] In some embodiments, the first insulating member 26 can be in sealing fit with the electrode terminal 23 and the first wall 213, and a part of the first insulating member 26 can extend between the hole wall of the second through hole 2131 and the protruding portion 242.

[0187] In the above solution, the arrangement of the first insulating member 26 can isolate the protruding portion 242 from the first wall 213 to reduce the risk of positive and negative electrode contact short circuit.

[0188] Please refer to Figure 5 , according to some embodiments of the present application, the battery cell 20 further includes a second insulating member 27. Along the thickness direction Z of the first wall, at least a part of the second insulating member 27 is disposed between the first wall 213 and the body portion 241; the second insulating member 27 is provided with a third through hole 271 corresponding to the second through hole 2131, and a part of the protruding portion 242 extends into the third through hole 271.

[0189] In some embodiments, the second insulating member 27 can be entirely disposed between the first wall 213 and the body portion 241.

[0190] In some embodiments, a part of the second insulating member 27 can be disposed between the first wall 213 and the body portion 241, and another part of the second insulating member 27 can also extend between the hole wall of the second through hole 2131 and the protruding portion 242.

[0191] The second insulating member 27 is an insulating component, and the second insulating member 27 is used to insulate and isolate the adapter 24 from the first wall 213. The material of the second insulating member 27 can be the same as that of the first insulating member 26. The material of the second insulating member 27 can be plastic, rubber, etc.

[0192] The third through hole 271 is correspondingly arranged with the second through hole 2131, and the diameter of the third through hole 271 can be less than or equal to the diameter of the second through hole 2131.

[0193] In some embodiments, along the thickness direction Z of the first wall, the second insulating member 27 can partially overlap with the second through hole 2131.

[0194] In the above solution, the setting of the second insulating member 27 can isolate the adapter 24 from the first wall 213, reducing the risk of positive and negative electrode contact short circuit. The setting of the third through hole 271 can facilitate the connection between the top wall 2421 and the electrode terminal 23.

[0195] According to some embodiments of the present application, the embodiments of the present application further provide a battery 100, which includes the battery cell 20 provided in any of the above embodiments.

[0196] According to some embodiments of the present application, the embodiments of the present application further provide an electrical device, which includes the battery cell 20 or the battery 100 provided in any of the above embodiments, and the battery cell 20 or the battery 100 is used to provide electrical energy.

[0197] Please refer to Figures 3 to 8 , according to some embodiments of the present application, the embodiments of the present application further provide an adapter 24, which includes a body portion 241 and a protruding portion 242. The body portion 241 is used to connect with the tab 221 of the battery cell 20; the protruding portion 242 includes a top wall 2421 and a side wall 2422, the side wall 2422 surrounds the top wall 2421, the side wall 2422 connects the top wall 2421 and the body portion 241, and the top wall 2421 is used to weld with the electrode terminal 23 of the battery cell 20. Among them, the thickness of the top wall 2421 is less than the thickness of the body portion 241.

[0198] For the adapter 24 according to the embodiments of the present application, the thickness of the top wall 2421 is less than the thickness of the body portion 241. The thickness of the body portion 241 is relatively thick to facilitate improving the overcurrent capacity between the adapter 24 and the tab 221, and the thickness of the top wall 2421 is relatively thin to facilitate improving the welding reliability between the adapter 24 and the electrode terminal 23, so that the battery cell 20 formed by the adapter 24 has high charge and discharge cycle performance and high reliability.

[0199] Next, the manufacturing method of the adapter will be described. Please refer to Figure 10 ,Figure 10 Flow schematic diagram of the manufacturing method of the adapter provided by some embodiments of the present application.

[0200] According to some embodiments of the present application, the embodiments of the present application further provide a manufacturing method of an adapter, which includes:

[0201] S100, providing a sheet, and a fourth through hole is provided in the area to be stamped of the sheet;

[0202] S200, stamping the area to be stamped to form a protruding portion 242 having a top wall 2421 and a side wall 2422, and the position where the fourth through hole is located is on the top wall 2421, so that the thickness of the top wall 2421 is less than the thickness of the non-stamped area of the sheet.

[0203] In the step "S200, stamping the area to be stamped to form a protruding portion 242 having a top wall 2421 and a side wall 2422, so that the thickness of the top wall 2421 is less than the thickness of the non-stamped area of the sheet", the non-stamped area may be the body portion 241 of the adapter 24.

[0204] In the step "S200, stamping the area to be stamped to form a protruding portion 242 having a top wall 2421 and a side wall 2422, so that the thickness of the top wall 2421 is less than the thickness of the non-stamped area of the sheet", the area to be stamped is stamped multiple times to thin the area to be stamped, so that the thickness of the top wall 2421 is less than the thickness of the non-stamped area of the sheet. Among them, during the stamping process, the material of the area to be stamped flows, so that the fourth through hole shrinks. While the thickness of the top wall 2421 is thinned, a groove or a first through hole 2423 is formed on the top wall 2421. After the stamping is completed, the thickness of the top wall 2421 is less than the thickness of the non-stamped area of the sheet, and the non-stamped area of the sheet forms the body portion 241 of the adapter 24.

[0205] According to the manufacturing method of the adapter of the embodiments of the present application, the sheet is stamped by a stamping forming method, and a fourth through hole is preset in the sheet, which is convenient for the flow of materials, so that the thickness of the top wall is less than the thickness of the non-stamped area of the sheet, and the processing technology is less difficult and convenient for processing and manufacturing.

[0206] Please refer to Figure 11 , Figure 11 Flow schematic diagram of the manufacturing method of the adapter provided by other embodiments of the present application.

[0207] According to some embodiments of the present application, the embodiments of the present application further provide a manufacturing method of an adapter, which includes:

[0208] S300, providing a sheet;

[0209] The S400 punches the area to be punched of the sheet metal with a punch having a groove to form a protrusion having a top wall and a side wall, such that the thickness of the top wall is less than the thickness of the unpunched area of the sheet metal.

[0210] Among them, the groove of the punch can be a groove with one end open or a groove with opposite ends open, such as a through hole provided on the punch.

[0211] After the punch punches the area to be punched, a protrusion 242 is formed, and the unpunched area of the sheet metal forms the body portion 241 of the adapter 24.

[0212] According to the manufacturing method of the adapter of the embodiment of the present application, the sheet metal is punched by a stamping method, and the punch is provided with a groove to facilitate the material to flow into the groove, so that the thickness of the top wall is less than the thickness of the unpunched area of the sheet metal, and the processing technology is less difficult and easy to process and manufacture.

[0213] According to some embodiments of the present application, please refer to the figure. The embodiment of the present application provides a battery cell 20, which includes a housing 21, an electrode terminal 23, an electrode assembly 22, and an adapter 24.

[0214] The housing 21 includes a housing body and an end cap. The housing body has an opening, and the end cap covers the opening. The housing 21 includes a first wall 213, and the first wall 213 is the end cap.

[0215] The electrode terminal 23 is provided on the first wall 213.

[0216] The electrode assembly 22 is provided in the housing body, and the electrode assembly 22 has a tab 221.

[0217] The adapter 24 includes a body portion 241 and a protrusion 242. The body portion 241 is welded to the tab 221. The protrusion 242 includes a top wall 2421 and a side wall 2422. The side wall 2422 surrounds the top wall 2421. The side wall 2422 connects the top wall 2421 and the body portion 241. The adapter 24 forms a recess 243 corresponding to the protrusion 242 on the side facing the electrode assembly 22. The top wall 2421 is welded to the electrode terminal 23. Among them, the thickness of the top wall 2421 is less than the thickness of the body portion 241. The top wall 2421 has a groove or a first through hole 2423. The adapter 24 is formed by stamping a sheet metal having a fourth through hole.

[0218] According to the battery cell 20 of the embodiment of the present application, the thickness of the top wall 2421 is less than the thickness of the body portion 241. The body portion 241 has a relatively thick thickness and has good current-carrying capacity; the top wall 2421 has a relatively thin thickness, and the top wall 2421 has a good welding effect with the electrode terminal 23, and the connection reliability between the top wall 2421 and the electrode terminal 23 is relatively high. Therefore, the battery cell 20 has high charge and discharge cycle performance and high reliability.

[0219] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing including a first wall; an electrode terminal, disposed on the first wall; An electrode assembly is disposed in the housing, and the electrode assembly has a tab; A transition piece, the transition piece comprising a main body and a protruding portion, the main body being connected to the electrode tab, the protruding portion comprising a top wall and a side wall, the side wall being arranged around the top wall, the side wall connecting the top wall and the main body, and the top wall being welded to the electrode terminal; Wherein, the thickness of the top wall is smaller than the thickness of the main body.

2. The battery cell according to claim 1, characterized in that: The top wall is provided with a groove or a first through hole.

3. The battery cell according to claim 2, characterized in that: The top wall and the electrode terminal are welded to form a welding area, and the welding area is arranged around the groove or the first through hole.

4. The battery cell according to claim 3, characterized in that: Along the thickness direction of the first wall, the projection of the center of the welding area is within the first through hole, and the difference between the inner diameter of the welding area and the diameter of the first through hole is greater than or equal to 0.5 mm and less than or equal to 3 mm.

5. The battery cell according to claim 1, characterized in that: The thickness of the top wall is greater than or equal to 0.4 mm and less than or equal to 2.2 mm.

6. The battery cell according to claim 1, characterized in that: The thickness of the main body is greater than or equal to 0.6 mm and less than or equal to 1.5 mm, and the thickness of the top wall is greater than or equal to 0.4 mm and less than or equal to 1.3 mm; or, The thickness of the main body is greater than or equal to 1.5 mm and less than or equal to 2.5 mm, and the thickness of the top wall is greater than or equal to 1.3 mm and less than or equal to 2.2 mm.

7. The battery cell according to claim 1, characterized in that: The material of the adapter is aluminum, and the thickness of the main body is greater than or equal to 0.6 mm and less than or equal to 2.5 mm; or, The material of the adapter is copper, and the thickness of the main body is greater than or equal to 0.6 mm and less than or equal to 2 mm.

8. The battery cell according to claim 1, characterized in that: A ratio of a thickness of the main body portion to a thickness of the top wall is greater than or equal to 1.2 and less than or equal to 2.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The thickness of the top wall is smaller than the thickness of the side wall.

10. The battery cell according to claim 1, characterized in that: A protrusion is formed on a side of the top wall facing the electrode assembly.

11. The battery cell according to claim 10, characterized in that: The top wall and the electrode terminal are welded to form a welding area, and the welding area is arranged around the protrusion.

12. The battery cell according to claim 1, characterized in that: The first wall is provided with a second through hole, and a portion of the protrusion extends into the second through hole so that the top wall is welded to the electrode terminal.

13. The battery cell according to claim 12, characterized in that: The battery cell further includes a first insulating member, at least a portion of which is disposed between a hole wall of the second through hole and the protruding portion.

14. The battery cell according to claim 12, characterized in that: The battery cell further includes a second insulating member, at least a portion of which is disposed between the first wall and the main body portion along a thickness direction of the first wall; The second insulating member is provided with a third through hole corresponding to the second through hole, and a portion of the protrusion extends into the third through hole.

15. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 14.

16. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 14 or the battery according to claim 15, wherein the battery cell or the battery is used to provide electrical energy.

17. An adapter, characterized in that: include: The main body is used to connect with the tab of the battery cell; The protruding portion includes a top wall and a side wall, wherein the side wall is disposed around the top wall, the side wall connects the top wall and the main body, and the top wall is used for welding with the electrode terminal of the battery cell; Wherein, the thickness of the top wall is smaller than the thickness of the main body.

Images