Battery cell, battery, electric device, and connection member and manufacturing method for connection member

Abstract

Provided are a battery cell (20), a battery (100), an electric device, and a connection member (24) and a manufacturing method for the connection member (24). The battery cell (20) comprises a housing (21), an electrode terminal (23), an electrode assembly (22), and the connection member (24), wherein the housing (21) comprises a first wall (213); the electrode terminal (23) is disposed on the first wall (213); the electrode assembly (22) is disposed inside the housing (21) and has a tab (221); and the connection member (24) comprises a body portion (241) and a protruding portion (242); the body portion (241) is connected to the tab (221), and the protruding portion (242) comprises a top wall (2421) and a side wall (2422); the side wall (2422) surrounds the top wall (2421) and connects the top wall (2421) to the body portion (241), and the top wall (2421) is welded to the electrode terminal (23), the thickness of the top wall (2421) being less than that of the body portion (241). The battery cell (20) has high charge-discharge cycle performance and high reliability.

Description

Battery cell, battery, electric device, adapter and manufacturing method of adapter TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery, an electric device, an adapter and a manufacturing method of the adapter. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery, the charge-discharge cycle performance and reliability of the battery cannot be ignored. Therefore, how to balance the charge-discharge cycle performance and reliability of the battery is a technical problem that needs to be solved in the battery technology.

[0004] SUMMARY

[0005] The present application provides a battery cell, a battery, an electric device, an adapter and a manufacturing method of the adapter, which can balance the high charge-discharge cycle performance and high reliability of the battery cell.

[0006] The present application is achieved by the following technical solutions:

[0007] In a first aspect, 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 has a tab; the adapter includes a body portion and a protruding portion, the body portion is connected with 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 with the electrode terminal; wherein the thickness of the top wall is less than the thickness of the body portion.

[0008] According to the battery cell 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 good flow capacity, and the top wall has good welding effect with the electrode terminal, so that the battery cell has high charge-discharge cycle performance and high reliability.

[0009] According to some embodiments of the present application, the top wall is provided with a groove or a first through hole.

[0010] In the above scheme, the groove or the first through hole is provided, the adapter can be formed by stamping, the material flows to make the thickness of the top wall less than the thickness of the body portion.

[0011] According to some embodiments of the present application, the top wall is welded with the electrode terminal to form a welding area, and the welding area is arranged around the groove or the first through hole.

[0012] In the above scheme, the welding area is arranged around the groove or the first through hole, the space of the top wall is reasonably utilized, the top wall has a larger connecting area with the electrode terminal, and the top wall and the electrode terminal are firmly welded.

[0013] 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 in the first through hole, 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.

[0014] In the above scheme, the first through hole and the welding area satisfy the above relationship, the position of the welding area can be determined, the top wall and the electrode terminal are welded, and the welding area can have a larger area, and the top wall and the electrode terminal are firmly connected.

[0015] 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.

[0016] In the above scheme, the thickness of the top wall satisfies the above relationship, the adapter and the electrode terminal have a higher flow capacity, and the top wall and the electrode terminal are welded and connected.

[0017] According to some embodiments of the present application, the thickness of the body part 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 part 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.

[0018] In the above scheme, when the thickness of the body part is 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 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 part is 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 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 part, on the one hand, the flow capacity of the body part is strong, and on the other hand, the welding process difficulty of the top wall and the electrode terminal is low.

[0019] According to some embodiments of the present application, the material of the adapter is aluminum, the thickness of the body part 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 part is greater than or equal to 0.6 mm and less than or equal to 2 mm.

[0020] In the above scheme, when the material of the adapter is aluminum, the thickness of the body part is 0.6mm-2.5mm, on the one hand, the flow capacity is 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 plate), the processing and manufacturing difficulty is lower; when the material of the adapter is copper, the thickness of the body part is 0.6mm-2mm, on the one hand, the flow capacity is 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 plate), the processing and manufacturing difficulty is lower.

[0021] 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.

[0022] In the above scheme, the ratio of the thickness of the body part to the thickness of the top wall satisfies the above relationship, which can balance the higher flow capacity and the better welding stability requirement of the top wall and the electrode terminal.

[0023] According to some embodiments of the present application, the thickness of the top wall is less than the thickness of the side wall.

[0024] In the above scheme, the thickness of the top wall is less than the thickness of the side wall, which is convenient for integrally forming, and the protruding part has higher strength.

[0025] According to some embodiments of the present application, the side of the top wall facing the electrode assembly is formed with a protrusion.

[0026] In the above scheme, the adapter can be formed by stamping, and the protrusion is formed by material flow forming, so that the thickness of the top wall is less than the thickness of the body part.

[0027] 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.

[0028] In the above scheme, the welding area is arranged around the protrusion, which reasonably utilizes the space of the top wall, so that the top wall and the electrode terminal have a larger connection area, and the top wall and the electrode terminal are firmly welded.

[0029] 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 are welded.

[0030] In the above scheme, the second through hole is provided, which is convenient for connecting the top wall and the electrode terminal.

[0031] According to some embodiments of the present application, the battery monomer further comprises a first insulating part, at least a part of the first insulating part is arranged between the hole wall of the second through hole and the protruding part.

[0032] In the above scheme, the first insulating piece is arranged to separate the protruding portion from the first wall, so as to reduce the risk of positive and negative contact short circuit.

[0033] According to some embodiments of the present application, the battery cell further comprises a second insulating piece, at least a portion of the second insulating piece is arranged between the first wall and the body portion along the thickness direction of the first wall; the second insulating piece is provided with a third through hole corresponding to the second through hole, and a portion of the protruding portion extends into the third through hole.

[0034] In the above scheme, the second insulating piece is arranged to separate the adapter from the first wall, so as to reduce the risk of positive and negative contact short circuit. The third through hole is arranged to facilitate the connection of the top wall and the electrode terminal.

[0035] In a second aspect, the embodiments of the present application further provide a battery comprising the battery cell according to any of the above embodiments.

[0036] In a third aspect, the embodiments of the present application further provide a use electric device comprising the battery cell or the battery according to any of the above embodiments, and the battery cell or the battery is used to provide electric energy.

[0037] In a fourth aspect, the embodiments of the present application further provide an adapter comprising: a body portion and a protruding portion, the body portion is used to connect with the tab of the battery cell; the protruding portion comprises a top wall and a side wall, the side wall surrounds the periphery of the top wall, the side wall connects the top wall and the body portion, and the top wall is used to be welded with the electrode terminal of the battery cell; wherein the thickness of the top wall is less than the thickness of the body portion.

[0038] According to the adapter of the embodiments of the present application, the thickness of the top wall is less than the thickness of the body portion, the thickness of the body portion is relatively thick, so as to improve the flow energy between the adapter and the tab, the thickness of the top wall is relatively thin, so as to improve the welding reliability between the adapter and the electrode terminal, so that the battery cell formed by the adapter has higher charge-discharge cycle performance and higher reliability.

[0039] In a fifth aspect, the embodiments of the present application further provide a manufacturing method of an adapter, comprising: providing a plate material, the to-be-stamped region of the plate material is provided with a fourth through hole; stamping the to-be-stamped region to form a protruding portion with a top wall and a side wall, and the position where the fourth through hole is located is located at the top wall, so that the thickness of the top wall is less than the thickness of the un-stamped region of the plate material.

[0040] According to the manufacturing method of the adapter of the embodiments of the present application, the plate material is stamped by stamping forming, the plate material is provided with the fourth through hole, so as to facilitate the flow of material, so that the thickness of the top wall is less than the thickness of the un-stamped region of the plate material, and the processing difficulty is relatively low, so as to facilitate the processing and manufacturing.

[0041] In a sixth aspect, the embodiments of the present application further provide a manufacturing method of the adapter, which comprises: providing a plate; stamping a to-be-stamped region of the plate by using a punch with a groove to form a protruding part with a top wall and a side wall, so that the thickness of the top wall is less than the thickness of an un-stamped region of the plate.

[0042] According to the manufacturing method of the adapter, the plate is stamped by using the stamping forming mode, the punch is provided with the 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 un-stamped region of the plate, and the processing difficulty is low, and the manufacturing is facilitated.

[0043] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without creative labor.

[0045] Fig. 1 is a structural schematic view of a vehicle provided by some embodiments of the present application;

[0046] Fig. 2 is a structural exploded schematic view of a battery provided by some embodiments of the present application;

[0047] Fig. 3 is a structural exploded schematic view of a battery monomer provided by some embodiments of the present application;

[0048] Fig. 4 is a sectional view of the battery monomer provided by some embodiments of the present application;

[0049] Fig. 5 is a partial enlarged view of A in Fig. 4;

[0050] Fig. 6 is a perspective view of an adapter provided by some embodiments of the present application;

[0051] Fig. 7 is a sectional view of the adapter provided by some embodiments of the present application;

[0052] Fig. 8 is a partial enlarged view of B in Fig. 7;

[0053] Fig. 9 is a structural schematic view of a welding area provided by some embodiments of the present application;

[0054] Fig. 10 is a flow schematic view of a manufacturing method of the battery monomer provided by some embodiments of the present application;

[0055] FIG. 11 is a flowchart of a method for manufacturing a battery cell according to some embodiments of the present application;

[0056] In the drawings, the figures are not necessarily drawn to scale.

[0057] Legend: 100 - battery; 10 - case; 11 - first sub-case; 12 - second sub-case; 20 - battery cell; 21 - housing; 211 - casing; 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 - protrusion; 2421 - top wall; 2422 - side wall; 2423 - first through hole; 243 - recess; 25 - welding area; 26 - first insulator; 27 - second insulator; 271 - third through hole; 200 - controller; 300 - motor; 1000 - vehicle; J - radial direction of protrusion; X - thickness direction of electrode assembly; Y - second direction; Z - thickness direction of first wall. DETAILED DESCRIPTION

[0058] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to clearly and completely describe the technical solutions of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all of the embodiments of the present application. Based on the embodiments in the present application, any other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for describing particular embodiments only and is not intended to be limiting of the application. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms (i.e., the terms do not allow for exclusion of any other items, components, elements, or the like from being included). The terms "first", "second" and other similar terms are used to distinguish one element from another, but do not otherwise limit the elements. The terms "including", "comprising", "having" and "front of" are used herein to mean "including but not limited to".

[0060] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described in this application can be combined with one another.

[0061] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0063] "Multiple" appearing in this application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0064] In some embodiments, the battery can be a battery module, and when there are multiple battery monomers, the multiple battery monomers are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and a battery monomer, and the battery monomer or the battery module is contained in the box body.

[0066] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0067] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0068] In the embodiments of the application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0069] The battery cell can 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 hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0070] The battery cell generally includes an electrode assembly. The electrode assembly includes a cathode, an anode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the cathode and the anode. The separator is disposed between the cathode and the anode, and can function to prevent short circuiting of the cathode and the anode while allowing the active ions to pass through.

[0071] In some embodiments, the cathode can be a cathode sheet, which can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0072] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two surfaces of the cathode current collector.

[0073] As an example, the cathode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. with a silver plating treatment on the surface thereof can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (e.g., a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, the cathode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a cathode active material for a battery can also be used.

[0075] In some embodiments, the anode can be an anode sheet, which can include an anode current collector.

[0076] As an example, the anode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver plating treatment on the surface thereof, stainless steel with a silver plating treatment on the surface thereof, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used.

[0077] In some embodiments, the anode current collector has two surfaces opposite in the thickness direction thereof, and the anode active material is disposed on either one or both of the two surfaces of the anode current collector.

[0078] As an example, the negative active material can employ a negative active material for a battery that is publicly known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery can also be used. These negative active materials can be used alone or in combination of two or more.

[0079] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0080] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0081] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0082] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound to form the wound structure.

[0083] In some embodiments, the electrode assembly is a stacked structure.

[0084] In some embodiments, the battery cell can include a case. The case is used to package the electrode assembly and other components such as the electrolyte. The case can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), or a composite metal case (e.g., a copper-aluminum composite case), etc.

[0085] In some embodiments, the case includes an end cap and a case body, and the case body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte, etc. The case body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0086] In some embodiments, at least one electrode terminal is arranged on the shell, and the electrode terminal is electrically connected with the tab of the electrode assembly. The electrode terminal can be directly connected with the tab or indirectly connected with the tab through an adapter. The electrode terminal can be arranged on the end cover or the shell.

[0087] In some embodiments, an explosion-proof valve is arranged on the shell. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0088] For example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell with other shapes, such as a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), and the like. The embodiments of the present application are not particularly limited.

[0089] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, assembly efficiency, and the like, in addition to the charge-discharge cycle performance and reliability of the battery.

[0090] In some embodiments, the battery cell includes a shell, an electrode terminal, an electrode assembly, and an adapter. The electrode terminal is arranged on the shell, and the adapter is used to electrically connect the electrode terminal and the tab of the electrode assembly. In order to facilitate the connection of the adapter and the electrode terminal, the adapter can include a body portion and a protruding portion. The body portion is connected with the tab, and the top wall of the protruding portion is connected with the electrode terminal. Generally, the body portion and the protruding portion are integrally formed, and the thickness of the body portion is the same as the thickness of the top wall. The overcurrent capacity of the adapter affects the charge-discharge cycle performance of the battery cell. Therefore, the thickness of the adapter is relatively thick, and the overcurrent capacity of the adapter is relatively high. However, the top wall is welded with the electrode terminal. If the thickness of the adapter is relatively thick, the top wall is welded with the electrode terminal, and the false welding, cracking, and the like are prone to occur, which causes the connection between the adapter and the electrode terminal to be not firm, affects the welding reliability of the adapter and the electrode terminal, and thus affects the reliability of the battery cell. Therefore, the adapter cannot meet the requirements of high overcurrent capacity and welding reliability with the electrode terminal, and the battery cell cannot meet the requirements of high charge-discharge cycle performance and high reliability.

[0091] In view of this, in order to solve the problem that the battery cell cannot meet the requirements of high charge-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 tab; the adapter includes a body portion and a protruding portion. The body portion is connected with the tab, and 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 welded with the electrode terminal; and the thickness of the top wall is less than the thickness of the body portion. The battery cell can meet the requirements of high charge-discharge cycle performance and high reliability.

[0092] In the battery cell, the thickness of the top wall is thinner relative to the thickness of the body part, so that the thickness of the body part can be thicker to facilitate the current-carrying capacity between the adapter and the tab, the thickness of the top wall can be thinner to facilitate the welding effect between the top wall and the electrode terminal, the current-carrying capacity of the adapter is improved, and the welding reliability of the adapter and the electrode terminal is improved, so that the battery cell has higher charge-discharge cycle performance and higher reliability.

[0093] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery disclosed in the present application.

[0094] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0095] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0096] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended electric vehicle. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000, which is used for the working power demand of the circuit system of the vehicle 1000, such as the starting, navigation and running of the vehicle 1000.

[0097] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the starting, navigation and running of the vehicle 1000.

[0098] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0099] Please refer to FIG. 2, which is a structural exploded view of a battery according to some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, which is accommodated in the box 10. The box 10 is configured to provide a space for accommodating the battery cell 20, and can have various structures. In some embodiments, the box 10 can include a first sub-box 11 and a second sub-box 12, which are coupled to each other to define a space for accommodating the battery cell 20. The second sub-box 12 can be a hollow structure with an open end, and the first sub-box 11 can be a plate structure, which is coupled to the open end of the second sub-box 12 to define the space for accommodating the battery cell 20 together with the second sub-box 12. Alternatively, the first sub-box 11 and the second sub-box 12 can both be hollow structures with an open end, and the open end of the first sub-box 11 is coupled to the open end of the second sub-box 12.

[0100] In the battery 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then accommodated in the box 10. Alternatively, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the box 10. The battery 100 can further include other structures, for example, the battery 100 can further include a busbar component for electrically connecting the multiple battery cells 20.

[0101] The battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0102] Please refer to FIG. 3, which is a structural exploded view of a battery cell according to some embodiments of the present application. As shown in FIG. 3, 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, and the shell 211 has an opening, which is closed by the end cap 212 to isolate the internal environment of the battery cell 20 from the external environment.

[0103] The shell 211 is a component for fitting the end cover 212 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte and other components. The shell 211 and the end cover 212 can be independent components. The shell 211 can be of various shapes and sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0104] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 212 is not easily deformed when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength and reliability can also be improved. The end cover 212 can be provided with functional components such as the electrode terminal 23. 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 cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 212, which can be used to isolate the electrical connection components in the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0105] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained in the shell 211. The electrode assembly 22 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and generally has a separator film between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion of active material constituting the main body of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet without active material each constitute a tab. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body respectively.

[0106] Please refer to FIG. 3, and further refer to FIG. 4 to FIG. 8, FIG. 4 is a cross-sectional view of a battery cell provided by some embodiments of the present application, FIG. 5 is a partial enlarged view of A in FIG. 4, FIG. 6 is a perspective view of an adapter provided by some embodiments of the present application, FIG. 7 is a cross-sectional view of the adapter provided by some embodiments of the present application, and FIG. 8 is a partial enlarged view of B in FIG. 7.

[0107] The battery cell 20 provided by the embodiments of the present application comprises a shell 21, an electrode terminal 23, an electrode assembly 22 and an adapter 24. The shell 21 comprises a first wall 213; the electrode terminal 23 is arranged on the first wall 213; the electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 has a tab 221; the adapter 24 comprises a body part 241 and a protruding part 242, the body part 241 is connected with the tab 221, the protruding part 242 comprises a top wall 2421 and a side wall 2422, the side wall 2422 is arranged around the top wall 2421, the side wall 2422 connects the top wall 2421 and the body part 241, and the top wall 2421 is welded with the electrode terminal 23; wherein the thickness of the top wall 2421 is less than the thickness of the body part 241.

[0108] The shell 21 can comprise a casing and an end cover, and the first wall 213 can be a wall part of the casing, or the first wall 213 can be the end cover.

[0109] In some embodiments, the first wall 213 is the end cover, facilitating the assembly of the electrode terminal 23 and the first wall 213.

[0110] 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.

[0111] In some embodiments, an insulating structure can be arranged between the electrode terminal 23 and the first wall 213, which separates the electrode terminal 23 and the first wall 213 to reduce the risk of positive and negative contact short circuit.

[0112] The adapter 24 is a component for realizing the electrical connection between the tab 221 and the electrode terminal 23, and the adapter 24 is a conductive component, for example, the material of the adapter 24 can be metal, such as copper, aluminum, etc.

[0113] In some embodiments, the electrode terminal 23 comprises a positive electrode terminal 23a and a negative electrode terminal 23b, and the positive electrode terminal 23a and the negative electrode terminal 23b are arranged on the first wall 213 in a spaced manner; the electrode assembly 22 has a positive tab 221a and a negative tab 221b, and the adapter 24 comprises 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, the electrode terminal 23, the tab 221 and the adapter 24 mentioned in the embodiments of the present application are of the same polarity without being limited.

[0114] The body portion 241 can be a base of the adapter 24, and the protruding portion 242 can protrude from one side of the body portion 241 in a thickness direction of the adapter 24. For example, the body portion 241 has a first surface facing away from the electrode assembly 22, and the protruding portion 242 protrudes from the first surface. The protruding portion 242 protrudes in a direction away from the electrode assembly 22, so as to be connected to the electrode terminal 23. 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 portion 241 can be parallel to the thickness direction of the adapter 24. The thickness direction of the top wall 2421 can be parallel to the thickness direction of the adapter 24.

[0115] The side wall 2422 surrounds the top wall 2421, so that the protruding portion 242 has a hollow structure. For example, the adapter 24 has a recess 243 corresponding to the protruding portion 242 on a side facing the electrode assembly 22. The recess 243 can be a groove. The inner surface of the side wall 2422 and the inner surface of the top wall 2421 form the recess 243. The outer surface of the top wall 2421 is welded to the electrode terminal 23.

[0116] In some embodiments, the adapter 24 is formed by stamping a plate material to form the body portion 241 and the protruding portion 242. 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 portion 241.

[0117] In some embodiments, the protruding portion 242 can have a cylindrical shape.

[0118] For ease of description, in FIG. 8, the dimension indicated by the letter H1 is the thickness of the body portion 241, and the dimension indicated by the letter H2 is the thickness of the top wall 2421.

[0119] The thickness of the top wall 2421 can be detected by disassembling the battery monomer 20 and detecting the thickness of a non-welding area of the top wall 2421.

[0120] The adapter 24 can be made of copper, aluminum, stainless steel, titanium alloy, or nickel alloy.

[0121] According to the battery monomer 20, the thickness of the top wall 2421 of the protruding portion 242 is designed to be less than the thickness of the body portion 241. The body portion 241 is thicker, and the top wall 2421 is thinner. The body portion 241 has a better flow capacity, and the top wall 2421 has a better welding effect with the electrode terminal 23. Therefore, the battery monomer 20 has higher charge-discharge cycle performance and higher reliability.

[0122] Please refer to FIG. 8. According to some embodiments of the present application, the top wall 2421 is provided with a groove or a first through hole 2423.

[0123] The recess or the first through hole 2423 can be a feature formed after the adapter 24 is stamped, for example, during the manufacturing of the adapter 24, a fourth through hole can be provided on a plate, and then a region within a certain range of the fourth through hole can be stamped to form a protruding portion 242 with a thickness of the top wall 2421 smaller 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 the recess or the first through hole 2423 on the top wall 2421. It should be noted that when the first through hole 2423 is small in size, it can be a gap.

[0124] The recess can be recessed from one side of the thickness direction of the top wall 2421, or recessed from both sides of the thickness direction of the top wall 2421.

[0125] The shape of the first through hole 2423 can be a round hole, a square hole, a triangular hole, an elliptical hole, etc.

[0126] In the above scheme, the recess or the first through hole 2423 is provided, and the adapter 24 can be formed by stamping, which facilitates the flow of the material to make the thickness of the top wall 2421 smaller than the thickness of the body portion 241.

[0127] Please refer to FIG. 5, and further refer to FIG. 9, which is a structural schematic diagram of a welding area provided by some embodiments of the present application. According to some embodiments of the present application, the top wall 2421 is welded with the electrode terminal 23 to form a welding area 25, and the welding area 25 is arranged around the recess or the first through hole 2423.

[0128] The welding area 25 can be a welding mark, and 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.

[0129] When the top wall 2421 is welded with the electrode terminal 23, the recess or the first through hole 2423 is avoided, so that the recess or the first through hole 2423 is surrounded by the welding area 25, which can improve the welding reliability of the top wall 2421 and the electrode terminal 23.

[0130] In the above scheme, the welding area 25 is arranged around the recess or the first through hole 2423, which reasonably utilizes the space of the top wall 2421, so that the top wall 2421 and the electrode terminal 23 have a larger connection area, and the top wall 2421 and the electrode terminal 23 are firmly welded.

[0131] 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 in the through hole is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0132] In some embodiments, the welding area 25 can be in the form of a circular ring.

[0133] In some embodiments, the center of the first through hole 2423 can overlap with the center of the welding area 25, and the center of the welding area 25 can be the center of the first through hole 2423 when the top wall 2421 is provided with the first through hole 2423.

[0134] In some embodiments, the first through hole 2423 can be a circular hole.

[0135] In some embodiments, when the first through hole 2423 is irregularly shaped, the diameter of the first through hole 2423 refers to the diameter of the circumscribed circle of the first through hole 2423.

[0136] For ease of description, in FIG. 9, 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.

[0137] The difference between the inner diameter of the welding area 25 and the diameter of the first through hole 2423 can be any one point value or a range between any two point values of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm.

[0138] Optionally, the difference between the inner diameter of the welding area 25 and the diameter of the first through hole 2423 can be 1 mm to 2 mm.

[0139] In the above scheme, 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, facilitate the welding of the top wall 2421 and the electrode terminal 23, and enable the welding area 25 to have a larger area, and the top wall 2421 and the electrode terminal 23 are firmly connected.

[0140] In some embodiments, the center of the first through hole 2423 can overlap with the center of the top wall 2421.

[0141] In some embodiments, the symmetry of the center of the first through hole 2423 relative 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 can be located at the center of the top wall 2421, or there is a certain deviation between the center of the first through hole 2423 and the center of the top wall 2421.

[0142] 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.

[0143] Optionally, the thickness of the top wall 2421 is any one 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 a range between any two of them.

[0144] In the above scheme, the thickness of the top wall 2421 satisfies the above relationship, the adapter 24 has a higher overcurrent capacity with the electrode terminal 23, and the top wall 2421 is facilitated to be welded to the electrode terminal 23.

[0145] According to some embodiments of the present application, the thickness of the 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 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.

[0146] In some embodiments, 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, or a range between any two of them.

[0147] In some embodiments, the thickness of the top wall 2421 is any one 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 a range between any two of them.

[0148] In some embodiments, the thickness of the body portion 241 can be any one 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 a range between any two of them.

[0149] In some embodiments, the thickness of the top wall 2421 is any one 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 a range between any two of them.

[0150] In the above scheme, when the thickness of the body portion 241 is thin (e.g., 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 thin (e.g., 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 thick (e.g., 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 thick (e.g., 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 flow capacity of the body portion 241 is strong, on the other hand, the welding process difficulty of the top wall 2421 and the electrode terminal 23 is low.

[0151] In some embodiments, the thickness of the body portion 241 can be 0.8 mm to 2 mm.

[0152] In some embodiments, the thickness of the top wall 2421 can be 0.6 mm to 1.8 mm.

[0153] According to some embodiments of the present application, the material of the adapter 24 is aluminum, 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, the thickness of the body portion 241 is greater than or equal to 0.6 mm and less than or equal to 2 mm.

[0154] When the material of the adapter 24 is aluminum, the thickness of the body portion 241 can be any one point value or a range between any two point values in 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.

[0155] When the material of the adapter 24 is copper, the thickness of the body portion 241 can be any one point value or a range between any two point values in 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.

[0156] In the above scheme, when the material of the adapter 24 is aluminum, the thickness of the body portion 241 is 0.6mm-2.5mm, on the one hand, the flow capacity is stronger, on the other hand, when the adapter 24 is integrally formed to manufacture the protruding portion 242 (such as the top wall 2421 of the protruding portion 242 formed by stamping and thinning), the processing and manufacturing difficulty is lower; when the material of the adapter 24 is copper, the thickness of the body portion 241 is 0.6mm-2mm, on the one hand, the flow capacity is stronger, on the other hand, when the adapter 24 is integrally formed to manufacture the protruding portion 242 (such as the top wall 2421 of the protruding portion 242 formed by stamping and thinning), the processing and manufacturing difficulty is lower.

[0157] According to some embodiments of the present application, the ratio of the thickness of the 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.

[0158] For example, the ratio of the thickness of the 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.

[0159] When the ratio of the thickness of the body portion 241 to the thickness of the top wall 2421 is greater, the thickness of the body portion 241 can be thicker, or the thickness of the top wall 2421 can be thinner. When the ratio of the thickness of the body portion 241 to the thickness of the top wall 2421 is smaller, the thickness of the body portion 241 can be thinner, or the thickness of the top wall 2421 can be thicker.

[0160] When the ratio of the thickness of the body portion 241 to the thickness of the top wall 2421 is greater than or equal to 1.2, the thickness of the body portion 241 can be thicker, and the body portion 241 has higher flow capacity.

[0161] When the ratio of the thickness of the 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 thicker, meeting the welding requirements of the top wall 2421 and the electrode terminal 23.

[0162] In the above scheme, the ratio of the thickness of the body portion 241 to the thickness of the top wall 2421 meets the above relationship, which can take into account the higher flow capacity and the better welding stability requirements of the top wall 2421 and the electrode terminal 23.

[0163] 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.

[0164] In some embodiments, the thickness of the side wall 2422 gradually decreases from the body portion 241 to the top wall 2421.

[0165] The thickness of the top wall 2421 is less than the thickness of the side wall 2422, and the protruding portion 242 can be formed by stamping, and the top wall 2421 can be formed by stamping and thinning.

[0166] The thickness of the side wall 2422 is greater than the thickness of the top wall 2421, and the protrusion 242 can have higher overall strength while meeting the welding requirements of the top wall 2421 and the electrode terminal 23.

[0167] In the above scheme, the thickness of the top wall 2421 is less than the thickness of the side wall 2422, facilitating one-piece molding, and the protrusion 242 has higher strength.

[0168] According to some embodiments of the present application, one side of the top wall 2421 facing the electrode assembly 22 is formed with a protrusion (not shown in the figure).

[0169] The protrusion protrudes from the inner surface of the top wall 2421, and the protrusion protrudes towards 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.

[0170] In the manufacturing process of the adapter 24, the plate material is subjected to a stamping process, and the punch can be provided with a groove. When the punch acts on the area to be punched of the plate material, the material flows towards the groove of the punch, forming the protrusion 242 with the top wall 2421 and the side wall 2422, and the inner surface of the top wall 2421 forms the protrusion, so that the thickness of the top wall 2421 can be less than the thickness of the body portion 241.

[0171] In the above scheme, 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.

[0172] According to some embodiments of the present application, the top wall 2421 is welded with the electrode terminal 23 to form a welding area 25, and the welding area 25 is arranged around the protrusion.

[0173] The welding area 25 is arranged around the protrusion, so that when the top wall 2421 is welded with the electrode terminal 23, the welding head moves around the protrusion, so that the top wall 2421 and the electrode terminal 23 have a larger connection area.

[0174] In the above scheme, the welding area 25 is arranged around the protrusion, and the space of the top wall 2421 is reasonably utilized, so that the top wall 2421 and the electrode terminal 23 have a larger connection area, facilitating firm welding of the top wall 2421 and the electrode terminal 23.

[0175] According to some embodiments of the present application, the side wall 2422 can be arranged obliquely relative to the top wall 2421, for example, the diameter of the side wall 2422 gradually decreases from the body portion 241 towards the top wall 2421 along the thickness direction of the adapter 24.

[0176] According to some embodiments of the present application, the battery cell 20 is a square cell 20, and the shell 21 is a rectangular parallelepiped.

[0177] For example, referring to FIG. 3, the shell 21 comprises a housing 211 and an end cover 212, the housing 211 comprises 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 cover 212 and the fourth wall 2113 oppositely arranged along a third direction, the first wall 213 is the end cover 212, the first direction, the second direction Y and the third direction are perpendicular to each other, 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.

[0178] 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.

[0179] According to some embodiments of the present application, the body part 241 can comprise two connecting parts 2411, and the protruding part 242 is located between the two connecting parts 2411 along the thickness direction X of the electrode assembly.

[0180] In some embodiments, the number of the electrode assemblies 22 is four, two of which constitute a group, and the four electrode assemblies 22 are divided into two groups. In the two groups of electrode assemblies 22, the two tabs 221 of one group of electrode assemblies 22 are connected to one connecting part 2411, and the two tabs 221 of the other group of electrode assemblies 22 are connected to the other connecting part 2411.

[0181] In some embodiments, the number of the electrode assemblies 22 can also be two, and the tabs 221 of the two electrode assemblies 22 are connected to the two connecting parts 2411 respectively.

[0182] Referring to FIG. 5, according to some embodiments of the present application, the first wall 213 is provided with a second through hole 2131, and a part of the protruding part 242 extends into the second through hole 2131 so that the top wall 2421 is welded with the electrode terminal 23.

[0183] The second through hole 2131 penetrates the first wall 213 along the thickness direction Z of the first wall, and the second through hole 2131 connects the outer surface and the inner surface of the first wall 213.

[0184] The diameter of the second through hole 2131 is greater than the diameter (outer diameter) of the protruding part 242, so that a part of the protruding part 242 can extend into the second through hole 2131.

[0185] In the above scheme, the second through hole 2131 is provided to facilitate the connection of the top wall 2421 and the electrode terminal 23.

[0186] Referring to FIG. 5, according to some embodiments of the present application, the battery cell 20 further comprises a first insulation member 26, at least a portion of the first insulation member 26 is arranged between the hole wall of the second through hole 2131 and the protruding portion 242.

[0187] The first insulation member 26 is an insulation component, which can insulate and separate the protruding portion 242 and the first wall 213. The material of the first insulation member 26 can be plastic, rubber, etc.

[0188] In some embodiments, the first insulation member 26 is annular, and the first insulation member 26 is sleeved on the outside of the protruding portion.

[0189] In some embodiments, the first insulation member 26 can be bonded with the hole wall of the second through hole 2131.

[0190] In some embodiments, along the radial direction J of the protruding portion, the first insulation member 26 can be located between the hole wall of the second through hole 2131 and the protruding portion 242.

[0191] In some embodiments, along the radial direction J of the protruding portion, a portion of the first insulation 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 portion of the first insulation member 26 can be located between the electrode terminal 23 and the first wall 213. The first insulation member 26 can be bonded with the first wall 213.

[0192] In some embodiments, the first insulation member 26 can be sealingly fitted with the electrode terminal 23 and the first wall 213, and a portion of the first insulation member 26 can extend between the hole wall of the second through hole 2131 and the protruding portion 242.

[0193] In the above scheme, the arrangement of the first insulation member 26 can separate the protruding portion 242 and the first wall 213, so as to reduce the risk of positive and negative contact short circuit.

[0194] Referring to FIG. 5, according to some embodiments of the present application, the battery cell 20 further comprises a second insulation member 27, at least a portion of the second insulation member 27 is arranged between the first wall 213 and the body portion 241 along the thickness direction Z of the first wall; the second insulation member 27 is provided with a third through hole 271 corresponding to the second through hole 2131, and a portion of the protruding portion 242 extends into the third through hole 271.

[0195] In some embodiments, the second insulation member 27 can be arranged between the first wall 213 and the body portion 241.

[0196] In some embodiments, a portion of the second insulation member 27 can be arranged between the first wall 213 and the body portion 241, and another portion of the second insulation member 27 can also extend between the hole wall of the second through hole 2131 and the protruding portion 242.

[0197] The second insulation piece 27 is an insulation component, and is used to insulate and separate the adapter piece 24 from the first wall 213. The material of the second insulation piece 27 can be the same as that of the first insulation piece 26. The material of the second insulation piece 27 can be plastic, rubber, or the like.

[0198] The third through hole 271 is arranged in correspondence 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.

[0199] In some embodiments, along the thickness direction Z of the first wall, the second insulation piece 27 can partially overlap the second through hole 2131.

[0200] In the above scheme, the arrangement of the second insulation piece 27 can insulate and separate the adapter piece 24 from the first wall 213, and reduce the risk of positive and negative contact short circuit. The arrangement of the third through hole 271 can facilitate the connection of the top wall 2421 and the electrode terminal 23.

[0201] According to some embodiments of the present application, the embodiments of the present application also provide a battery 100, which comprises the battery cell 20 provided according to any of the above embodiments.

[0202] According to some embodiments of the present application, the embodiments of the present application also provide a battery 100, which comprises the battery cell 20 provided according to any of the above embodiments.

[0203] Please refer to FIGS. 3-8, according to some embodiments of the present application, the embodiments of the present application also provide an adapter piece 24, which comprises a body part 241 and a protruding part 242. The body part 241 is used to connect with the tab 221 of the battery cell 20; the protruding part 242 comprises a top wall 2421 and a side wall 2422, the side wall 2422 is arranged around the top wall 2421, the side wall 2422 connects the top wall 2421 and the body part 241, and the top wall 2421 is used to be welded with the electrode terminal 23 of the battery cell 20. Wherein, the thickness of the top wall 2421 is less than the thickness of the body part 241.

[0204] According to the adapter piece 24 of the embodiments of the present application, the thickness of the top wall 2421 is less than the thickness of the body part 241, the thickness of the body part 241 is relatively thick, so as to improve the flow energy between the adapter piece 24 and the tab 221, and the thickness of the top wall 2421 is relatively thin, so as to improve the welding reliability of the adapter piece 24 and the electrode terminal 23, so that the battery cell 20 formed by the adapter piece 24 has higher charge-discharge cycle performance and higher reliability.

[0205] A manufacturing method of the adapter will be described below. Please refer to FIG. 10, which is a flowchart of a manufacturing method of an adapter according to some embodiments of the present application.

[0206] According to some embodiments of the present application, the present application further provides a manufacturing method of an adapter, which comprises:

[0207] S100, providing a plate material, a fourth through hole being arranged in a to-be-stamped region of the plate material;

[0208] S200, stamping the to-be-stamped region to form a protruding part 242 with a top wall 2421 and a side wall 2422, and the fourth through hole is located at the top wall 2421, so that the thickness of the top wall 2421 is less than the thickness of an un-stamped region of the plate material.

[0209] In the step of “S200, stamping the to-be-stamped region to form a protruding part 242 with a top wall 2421 and a side wall 2422, and the thickness of the top wall 2421 is less than the thickness of an un-stamped region of the plate material”, the un-stamped region can be the body part 241 of the adapter 24.

[0210] In the step of “S200, stamping the to-be-stamped region to form a protruding part 242 with a top wall 2421 and a side wall 2422, and the thickness of the top wall 2421 is less than the thickness of an un-stamped region of the plate material”, the to-be-stamped region is stamped multiple times to thin the to-be-stamped region, so that the thickness of the top wall 2421 is less than the thickness of the un-stamped region of the plate material. During the stamping process, the material of the to-be-stamped region flows, so that the fourth through hole is reduced, and a groove or a first through hole 2423 is formed on the top wall 2421 while the thickness of the top wall 2421 is thinned. After the stamping is completed, the thickness of the top wall 2421 is less than the thickness of the un-stamped region of the plate material, and the un-stamped region of the plate material forms the body part 241 of the adapter 24.

[0211] According to the manufacturing method of the adapter provided by the embodiments of the present application, the plate material is stamped by a stamping forming method, the plate material is prearranged with the fourth through hole, the material flows to make the thickness of the top wall less than the thickness of the un-stamped region of the plate material, and the processing difficulty is low, so the manufacturing is convenient.

[0212] Please refer to FIG. 11, which is a flowchart of a manufacturing method of an adapter according to some other embodiments of the present application.

[0213] According to some embodiments of the present application, the present application further provides a manufacturing method of an adapter, which comprises:

[0214] S300, providing a plate material;

[0215] S400, the punch with the groove is used to stamp the to-be-stamped region of the plate to form a protruding part with a top wall and a side wall, so that the thickness of the top wall is smaller than the thickness of the un-stamped region of the plate.

[0216] The groove of the punch can be a groove with one open end or a groove with two opposite open ends, such as a through hole arranged on the punch.

[0217] After the punch stamps the to-be-stamped region, the protruding part 242 is formed, and the un-stamped region of the plate forms the body part 241 of the adapter 24.

[0218] According to the manufacturing method of the adapter provided in the embodiments of the present application, the plate is stamped by a stamping forming method, the punch is provided with a groove to facilitate the flow of material into the groove, so that the thickness of the top wall is smaller than the thickness of the un-stamped region of the plate, and the processing difficulty is low, which is convenient for processing and manufacturing.

[0219] According to some embodiments of the present application, referring to the drawings, the embodiments of the present application provide a battery monomer 20, which comprises a shell 21, an electrode terminal 23, an electrode assembly 22, and an adapter 24.

[0220] The shell 21 comprises a shell body and an end cover, the shell body has an opening, and the end cover covers the opening. The shell 21 comprises a first wall 213, and the first wall 213 is the end cover.

[0221] The electrode terminal 23 is arranged on the first wall 213.

[0222] The electrode assembly 22 is arranged in the shell body, and the electrode assembly 22 has a tab 221.

[0223] The adapter 24 comprises a body part 241 and a protruding part 242, the body part 241 is welded with the tab 221, the protruding part 242 comprises a top wall 2421 and a side wall 2422, the side wall 2422 surrounds the periphery of the top wall 2421, the side wall 2422 connects the top wall 2421 and the body part 241, 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 top wall 2421 is welded with the electrode terminal 23. The thickness of the top wall 2421 is smaller than the thickness of the body part 241. The top wall 2421 has a groove or a first through hole 2423. The adapter 24 is formed by stamping a plate with a fourth through hole.

[0224] According to the battery monomer 20 provided in the embodiments of the present application, the thickness of the top wall 2421 is smaller than the thickness of the body part 241, the thickness of the body part 241 is relatively thick, the body part 241 has good flow capacity, the thickness of the top wall 2421 is relatively thin, the top wall 2421 has good welding effect with the electrode terminal 23, and the connection between the top wall 2421 and the electrode terminal 23 has high reliability, so that the battery monomer 20 has high charge-discharge cycle performance and high reliability.

[0225] Although the present application has been described with reference to preferred embodiments, it is to be understood that various modifications can be made without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed herein, but includes all technical equivalents falling within the scope of the claims.

Claims

1. A battery cell, comprising: a housing comprising a first wall; an electrode terminal disposed on the first wall; an electrode assembly disposed in the housing, the electrode assembly having a tab; an adapter, the adapter comprising a body portion and a protruding portion, the body portion being connected with the tab, the protruding portion comprising a top wall and a side wall, the side wall being disposed around the top wall, the side wall connecting the top wall and the body portion, the top wall being welded with the electrode terminal; wherein a thickness of the top wall is less than a thickness of the body portion.

2. The battery cell of claim 1, wherein, the top wall is provided with a groove or a first through hole.

3. The battery cell of claim 2, wherein, the top wall is welded with the electrode terminal to form a welding zone, the welding zone being disposed around the groove or the first through hole.

4. The battery cell of claim 3, wherein, a projection of a center of the welding zone on the first through hole is along a thickness direction of the first wall, a difference between an inner diameter of the welding zone and a 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 of any one of claims 1-4, wherein, 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 of any one of claims 1-4, wherein, the thickness of the body portion is greater than or equal to 0.6 mm and less than or equal to 1.5 mm, 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, 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 of any one of claims 1-4, wherein, the adapter is made of aluminum, 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 adapter is made of copper, the thickness of the body portion is greater than or equal to 0.6 mm and less than or equal to 2 mm.

8. The battery cell of any one of claims 1-7, wherein, a ratio of the thickness of the body portion to the thickness of the top wall is greater than or equal to 1.2 and less than or equal to 2.

9. The battery cell of any one of claims 1-8, wherein, the thickness of the top wall is less than a thickness of the side wall.

10. The battery cell of claim 1, wherein, a side of the top wall facing the electrode assembly is formed with a protrusion.

11. The battery cell of claim 10, wherein, the top wall is welded with the electrode terminal to form a welding zone, the welding zone being disposed around the protrusion.

12. The battery cell of any one of claims 1-11, wherein, the first wall is provided with a second through hole, a part of the protruding portion extends into the second through hole to enable the top wall to be welded with the electrode terminal.

13. The battery cell of claim 12, wherein, the battery cell further comprises a first insulating member, at least a part of the first insulating member is disposed between a hole wall of the second through hole and the protruding portion.

14. The battery cell of claim 12, wherein, the battery cell further comprises a second insulating member, at least a part of the second insulating member is disposed between the first wall and the 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, a part of the protruding portion extends into the third through hole. 15.A battery comprising the battery cell according to any one of claims 1-14. 16.An electric device comprising the battery cell according to any one of claims 1-14 or the battery according to claim 15, the battery cell or the battery being used to provide electric energy. 17.An adapter, comprising: a body portion for connecting with a tab of a battery cell; The protrusion includes a top wall and a side wall surrounding the top wall, the side wall connecting the top wall and the body portion, the top wall being used for welding with an electrode terminal of the battery cell; The thickness of the top wall is less than the thickness of the body portion.

18. A manufacturing method of an adapter, comprising: providing a plate material, a fourth through hole being arranged in a to-be-stamped region of the plate material; stamping the to-be-stamped region to form a protrusion having a top wall and a side wall, and the fourth through hole being located at the top wall, so that the thickness of the top wall is less than the thickness of an un-stamped region of the plate material.

19. A manufacturing method of an adapter, comprising: providing a plate material; stamping a to-be-stamped region of the plate material by using a punch with a groove to form a protrusion having a top wall and a side wall, so that the thickness of the top wall is less than the thickness of an un-stamped region of the plate material.

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