Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and an adapter, the shell comprises a first wall; the electrode assembly is arranged in the shell and is provided with a tab; the electrode terminal is arranged on the first wall; the adapter comprises a first part and a second part which are connected with each other, the first part is welded with the electrode terminal to form a first welding part, and the second part is welded with the tab to form a second welding part; wherein on a projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first welding part is a first projection, the orthographic projection of the second welding part is a second projection, the first projection and the second projection are at least partially overlapped in the first direction, and the first direction is perpendicular to the thickness direction of the first wall. According to the technical scheme provided by the invention, the charge-discharge cycle performance of the battery monomer can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the manufacturing process of batteries, the charge and discharge cycle performance of the battery is an issue that cannot be ignored. Therefore, how to improve the charge and discharge cycle performance of the battery is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The present application provides a battery cell, a battery and an electrical device, which can improve the charge and discharge cycle performance of the battery cell.

[0005] This application is achieved 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 assembly, an electrode terminal, and an adapter. The housing includes a first wall; the electrode assembly is disposed in the housing, and the electrode assembly has a tab; the electrode terminal is disposed on the first wall; the adapter includes a first portion and a second portion connected to each other, the first portion is welded to the electrode terminal to form a first welding portion, and the second portion is welded to the tab to form a second welding portion; wherein, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first welding portion is the first projection, and the orthographic projection of the second connection portion is the second projection; along the first direction, the first projection and the second projection at least partially overlap, and the first direction is perpendicular to the thickness direction of the first wall.

[0007] According to the battery cell of the embodiment of the present application, on the same projection plane perpendicular to the thickness direction of the first wall, along the first direction, the first projection and the second projection at least partially overlap, when the current flows from the first welding part to the second welding part or from the second welding part to the first welding part, the current can flow along the first direction, and the current flow path in the adapter is shorter, which can improve the current flow capacity of the adapter, thereby improving the charge and discharge cycle performance of the battery cell.

[0008] According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction of the first wall, along the first direction, the first projection and the second projection have an overlapping area, and the orthographic projection of the portion of the adapter in the overlapping area is continuously distributed.

[0009] In the above solution, on a cross-section parallel to the first direction and passing through the first welding portion and the second welding portion, the cross-section of the adapter is continuous in the first direction, such that when current flows between the first welding portion and the second welding portion, the current has a shorter flow path, facilitating the improvement of the current-carrying capacity of the adapter.

[0010] According to some embodiments of the present application, the second portion is located on one side of the first portion along the first direction, and the first direction is parallel to the width direction of the first wall.

[0011] In the above solution, the second portion is located on one side of the first portion along the width direction of the first wall. The first portion and the second portion occupy a smaller space in the length direction of the first wall, and the size of the tab in the length direction of the first wall can be larger, so as to facilitate the improvement of the current-carrying capacity between the tab and the adapter.

[0012] According to some embodiments of the present application, along the second direction, the size of the second portion is greater than or equal to 20 mm and less than or equal to 50 mm. The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other in pairs, and the second direction is parallel to the length direction of the first wall.

[0013] In the above solution, the size of the second portion along the second direction satisfies the above relationship. On the one hand, the size of the tab in the second direction can be larger, so as to facilitate the improvement of the current-carrying capacity between the tab and the adapter. On the other hand, the second portion occupies a smaller space in the second direction, reducing the interference between the adapter and other components (such as insulating components, pressure relief mechanisms, etc.).

[0014] According to some embodiments of the present application, the first wall has a first edge and a second edge oppositely arranged in the second direction; the second portion has a first end close to the first edge and a second end close to the second edge; the first portion has a third end close to the first edge and a fourth end close to the second edge; along the direction from the second edge to the first edge, the first end extends beyond the third end; and / or, along the direction from the first edge to the second edge, the second end extends beyond the fourth end; the second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other in pairs, and the second direction is parallel to the length direction of the first wall.

[0015] In the above solution, the second portion has a larger size in the second direction, reasonably utilizing the space inside the battery cell in the second direction. The size of the tab in the second direction can be larger. When observed along the first direction, the second projection and the first projection have a larger overlapping area. For example, when observed along the first direction, the second projection can cover the entire first projection, which can shorten the flow path of the current in the adapter and improve the current-carrying capacity of the adapter. At the same time, the first portion has a smaller size in the second direction, so as to reduce the risk of interference between the electrode terminal and other components.

[0016] According to some embodiments of the present application, the first wall has a first edge and a second edge that are oppositely arranged in the second direction; the second part has a first end close to the first edge and a second end close to the second edge, and the first part has a third end close to the first edge and a fourth end close to the second edge; along the direction from the second edge to the first edge, the first end and the third end are flush, and along the direction from the first edge to the second edge, the second end and the fourth end are flush; the second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other in pairs, and the second direction is parallel to the length direction of the first wall.

[0017] In the above solution, the first end and the third end are flush, and the second end and the fourth end are flush, which is convenient for processing and manufacturing. At the same time, along the first direction, the second projection and the first projection can have a large overlapping area, so as to shorten the flow path of the current in the adapter and improve the current-carrying capacity of the adapter.

[0018] According to some embodiments of the present application, the first wall has a first edge and a second edge that are oppositely arranged in the second direction, the second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other in pairs, and the second direction is parallel to the length direction of the first wall; in the same projection plane perpendicular to the thickness direction of the first wall, the first projection has a third edge close to the first edge and a fourth edge close to the second edge, and the second projection has a fifth edge close to the first edge and a sixth edge close to the second edge; along the direction from the second edge to the first edge, the third edge does not extend beyond the fifth edge, and along the direction from the first edge to the second edge, the fourth edge does not extend beyond the sixth edge; or, along the direction from the second edge to the first edge, the fifth edge does not extend beyond the third edge, and along the direction from the first edge to the second edge, the sixth edge does not extend beyond the fourth edge.

[0019] In the above solution, when "along the direction from the second edge to the first edge, the third edge does not extend beyond the fifth edge, and along the direction from the first edge to the second edge, the fourth edge does not extend beyond the sixth edge", the size of the second projection in the second direction is greater than or equal to the size of the first projection in the second direction. When observed along the first direction, the second projection can cover the entire first projection, which can shorten the flow path of the current in the adapter and improve the current-carrying capacity of the adapter. When "along the direction from the second edge to the first edge, the fifth edge does not extend beyond the third edge, and along the direction from the first edge to the second edge, the sixth edge does not extend beyond the fourth edge", the size of the first projection in the second direction is greater than or equal to the size of the second projection in the second direction. When observed along the first direction, the first projection can cover the entire second projection, which can shorten the flow path of the current in the adapter and improve the current-carrying capacity of the adapter.

[0020] According to some embodiments of the present application, along the first direction, the first projection and the second projection completely overlap.

[0021] In the above solution, the first projection completely overlaps with the second projection, and the flow path of the current when flowing between the first welding part and the second welding part is short, so as to facilitate improving the current-carrying capacity of the adapter.

[0022] According to some embodiments of the present application, the number of the second parts is two, and along the first direction, the two second parts are respectively connected to both ends of the first part; in the same projection plane perpendicular to the thickness direction of the first wall, along the first direction, the first projection is located between the two second projections.

[0023] In the above solution, the two second parts are located at both ends of the first part in the first direction, so as to be connected to the tabs of the electrode assembly at different positions in the first direction, and rationally utilize the space inside the battery cell in the first direction.

[0024] According to some embodiments of the present application, the number of the electrode assemblies is two, the two electrode assemblies are stacked along the first direction, and the tabs of the two electrode assemblies are respectively connected to the two second parts.

[0025] In the above solution, the battery cell can be provided with more active materials to improve the energy density of the battery cell. The tabs of the two electrode assemblies are respectively connected to the two second parts, which is convenient for connecting the two electrode assemblies to the adapter.

[0026] According to some embodiments of the present application, the housing includes a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is the first wall; the number of the electrode assemblies is one, the size of the shell in the first direction is greater than or equal to 20 mm and less than or equal to 40 mm; or, the number of the electrode assemblies is two, the two electrode assemblies are stacked along the first direction, and the size of the shell in the first direction is greater than or equal to 35 mm and less than or equal to 90 mm; wherein, the first direction is parallel to the width direction of the first wall.

[0027] In the above solution, when the number of the electrode assemblies is one, the size of the shell in the first direction satisfies the above relationship (greater than or equal to 20 mm and less than or equal to 40 mm), and there is a large space inside the shell in the first direction, so as to facilitate the arrangement of the tabs and the electrode terminals in the first direction, and facilitate the processing and manufacturing of the electrode assembly. When the number of the electrode assemblies is two, the size of the shell in the first direction satisfies the above relationship (greater than or equal to 35 mm and less than or equal to 90 mm), and there is a large space inside the shell in the first direction, which is convenient for the arrangement of the tabs and the electrode terminals in the first direction, and more active materials can be arranged in the shell, which is convenient for improving the energy density of the battery cell.

[0028] According to some embodiments of the present application, the housing includes a housing body and an end cap. The housing body has an opening, and the end cap covers the opening. The end cap is the first wall. The dimension of the housing body in the second direction is greater than or equal to 120 mm and less than or equal to 300 mm. The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other pairwise, and the second direction is parallel to the length direction of the first wall.

[0029] In the above solution, the space occupied by the electrode terminal and the tab in the second direction is small. The dimension of the housing body in the second direction satisfies the above relationship (greater than or equal to 120 mm and less than or equal to 300 mm), and the connection reliability between the end cap and the housing body is high.

[0030] According to some embodiments of the present application, the battery cell further includes a first insulating member. Along the thickness direction of the first wall, at least a part of the first insulating member is disposed between the first wall and the adapter. The first wall is provided with a first through hole, and a part of the electrode terminal is disposed in the first through hole. The first insulating member has a first surface facing away from the first wall. Along the direction from the first wall to the electrode assembly, the electrode terminal protrudes from the first surface. The adapter further includes a bending portion. The second portion is connected to the first portion through the bending portion. Along the thickness direction of the first wall, the first portion protrudes from the second portion in the direction away from the first wall.

[0031] In the above solution, a part of the electrode terminal is disposed in the first through hole, and the electrode terminal protrudes from the first surface. The electrode terminal faces the inside of the battery cell. The first portion protrudes from the second portion in the direction away from the first wall. The electrode terminal is connected to the first portion, and the tab is connected to the second portion. Utilizing the space inside the battery cell in the thickness direction of the first wall facilitates reducing the overall height of the battery cell.

[0032] According to some embodiments of the present application, along the thickness direction of the first wall, the tab is located on the side of the second portion facing away from the first insulating member.

[0033] In the above solution, the tab is located on the side of the second portion facing away from the first insulating member, which is convenient for assembly and can reduce the risk of interference between the tab and the first insulating member.

[0034] According to some embodiments of the present application, along the thickness direction of the first wall, the distance between the second portion and the first insulating member is greater than or equal to 0.1 mm and less than or equal to the dimension of the second portion in the thickness direction of the first wall.

[0035] In the above solution, the distance between the second portion and the first insulating member satisfies the above relationship. On the one hand, it reserves an assembly space, adapts to machining errors, and reduces the risk of interference between the tab and the first insulating member. On the other hand, it reduces the waste of space in the thickness direction of the first wall.

[0036] According to some embodiments of the present application, along the second direction, the distance between the center of the first projection and the center of the second projection is not greater than 30 mm, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other in pairs.

[0037] In the above solution, the distance between the center of the first projection in the second direction and the center of the second projection in the second direction satisfies the above relationship. Along the first direction, the first projection and the second projection have a large overlapping area, and the flow path of the current between the first welding part and the second welding part is short, which is convenient for improving the current-carrying capacity of the adapter.

[0038] In a second aspect, an embodiment of the present application further provides a battery, which includes a battery cell provided in any of the above embodiments.

[0039] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a battery cell or a battery provided in any of the above embodiments, and the battery cell or the battery is used to provide electrical energy.

[0040] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in 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, without creative efforts, other related drawings can also be obtained based on these drawings.

[0042] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0043] Figure 2 Structural exploded view of a battery provided by some embodiments of the present application;

[0044] Figure 3 Structural exploded view of a battery cell provided by some embodiments of the present application;

[0045] Figure 4 Partial structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0046] Figure 5 Schematic diagram of a first projection and a second projection provided by some embodiments of the present application;

[0047] Figure 6 Assembly schematic diagram of an adapter and a first wall provided by some embodiments of the present application;

[0048] Figure 7 Assembly schematic diagram of the adapter and the first wall provided for other embodiments of the present application;

[0049] Figure 8 Assembly schematic diagram of the adapter and the first wall provided for some other embodiments of the present application;

[0050] Figure 9 Assembly schematic diagram of the adapter and the first wall provided for some other embodiments of the present application;

[0051] Figure 10 Schematic diagram of the first projection and the second projection provided for other embodiments of the present application;

[0052] Figure 11 Cross-sectional view of a partial structure of a battery cell provided for some embodiments of the present application;

[0053] Figure 12 For Figure 11 Partial enlarged view of part A;

[0054] Figure 13 For Figure 4 Partial enlarged view of part B.

[0055] Reference numerals: 100 - battery; 10 - box body; 11 - first sub-box body; 12 - second sub-box body; 20 - battery cell; 21 - outer shell; 211 - housing; 212 - end cover; 213 - first wall; 213a - first edge; 213b - second edge; 2131 - first through hole; 22 - electrode assembly; 221 - tab; 221a - positive tab; 221b - negative tab; 23 - electrode terminal; 23a - positive electrode terminal; 23b - negative electrode terminal; 231 - first end face; 24 - adapter; 24a - positive adapter; 24b - negative adapter; 241 - first part; 241a - third end; 241b - fourth end; 242 - second part; 242a - first end; 242b - second end; 243 - bending part; 244 - transition part; 251 - first welding part; 252 - second welding part; 253 - first projection; 253a - third edge; 253b - fourth edge; 254 - second projection; 254a - fifth edge; 254b - sixth edge; 255 - third projection; 26 - first insulating part; 261 - first surface; 200 - controller; 300 - motor; 1000 - vehicle; X - first direction; Y - second direction; Z - thickness direction of the first wall. Detailed implementation manners

[0056] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the scope of protection of this application.

[0057] 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 specification of this application 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 specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0058] 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 phrase appears in various places 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 will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0059] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "attached" shall 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 elements. 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.

[0060] The term "and / or" in this application is merely a description of the associated relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: 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.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] 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 cross beams and longitudinal beams of the vehicle.

[0065] 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.

[0066] 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 so as to be used continuously.

[0067] 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.

[0068] 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 play a role in preventing short circuit between the positive and negative electrodes to a certain extent, and at the same time can allow active ions to pass through.

[0069] In some embodiments, the positive electrode may be a positive electrode plate, and the positive electrode plate 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.

[0070] 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.

[0071] 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 base 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.).

[0072] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, 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.

[0073] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0074] 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.

[0075] 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 any one or both of the two opposite surfaces of the negative electrode current collector.

[0076] 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 oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, 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 can be used alone or in combination of two or more.

[0077] In some embodiments, the separator is a separator membrane. The present application has no particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In some embodiments, the electrode assembly has a stacked structure.

[0082] 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), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0083] 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 can be provided with one or more openings. One or more end caps can also be provided.

[0084] In some embodiments, at least one electrode terminal is provided on the housing. 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.

[0085] In some embodiments, a safety valve is provided on the housing. The safety valve is used to release the internal pressure of the battery cell.

[0086] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can protect the electrode assembly and prevent, for example, electrolyte leakage, etc. When the housing is a non-sealed structure, the housing can protect the electrode assembly. A sealed bag can also be included between the housing and the electrode assembly. The sealed bag is used to encapsulate the electrode assembly and the electrolyte, etc. Specifically, the sealed bag can be a bag-shaped insulating part or an aluminum-plastic film.

[0087] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, discharge capacity, and reliability. In addition, the charge-discharge cycle performance of the battery also needs to be considered.

[0088] In some embodiments, the battery cell includes a housing, an electrode assembly, an electrode terminal, and an adapter. The electrode assembly is disposed inside the housing, the electrode terminal is disposed on the first wall of the housing. The adapter is disposed inside the housing. The adapter electrically connects the electrode terminal and the tab of the electrode assembly. The adapter includes a first part and a second part connected to each other. The first part is connected to the electrode terminal to form a first welding part, and the second part is connected to the tab to form a second welding part. The first welding part and the second welding part are generally staggered in a first direction, so that the current flow path between the first welding part and the second welding part is long, and the current-carrying capacity of the adapter is poor, affecting the charge-discharge cycle performance of the battery cell.

[0089] In view of this, in order to solve the problem that the current-carrying capacity of the adapter is poor, resulting in poor charge and discharge cycle performance of the battery cell, the present application provides a battery cell, which includes a housing, an electrode assembly, an electrode terminal, and an adapter. The electrode terminal is disposed on a first wall of the housing, and the electrode assembly is disposed within the housing. The adapter includes a first part and a second part connected to each other. The first part is connected to the electrode terminal to form a first welding portion, and the second part is connected to the tab of the electrode assembly to form a second welding portion. In the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first welding portion is a first projection, and the orthographic projection of the second welding portion is a second projection. Along a first direction perpendicular to the thickness direction of the first wall, the first projection and the second projection at least partially overlap. The adapter has a high current-carrying capacity, and the battery cell has a high charge and discharge cycle performance.

[0090] In such a battery cell, when projected along the thickness direction of the first wall, in the projection plane perpendicular to the thickness direction of the first wall, along the first direction, the first projection and the second projection at least partially overlap. When current flows from the first welding portion to the second welding portion or from the second welding portion to the first welding portion, the current can flow along the first direction, and the flow path of the current in the adapter is short. The adapter has a high current-carrying capacity, and the battery cell has a high charge and discharge cycle performance.

[0091] The battery disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. The power system of the power-consuming device can be composed of the batteries disclosed in the present application.

[0092] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be but is not limited to mobile phones, tablet computers, laptop computers, electric toys, electric tools, electric bicycles, electric motorcycles, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0093] For the convenience of description, the following embodiments take a power-consuming device of a vehicle as an example in one embodiment of the present application for illustration.

[0094] Please refer to Figure 1 , Figure 1Schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can serve as the 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 the vehicle 1000.

[0095] 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 when starting, navigating, and driving the vehicle 1000.

[0096] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Please refer to Figure 2 , Figure 2 Schematic 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 can be a hollow structure with one end open, and the first sub-box body 11 can 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 can 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.

[0098] In the battery 100, there may be multiple battery cells 20. The multiple battery cells 20 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel 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 combined series-parallel connection and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 can also be such that multiple battery cells 20 are first connected in series, parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box 10. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0099] 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.

[0100] Please refer to Figure 3 , Figure 3 which is a schematic exploded view of the structure of the battery cell provided in some embodiments of the present application. As Figure 3 shown, the battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 23. The housing 21 includes a casing 211 and an end cap 212. The casing 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.

[0101] The casing 211 is a component for cooperating with the end cap 212 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The casing 211 and the end cap 212 can be independent components. The casing 211 can be of various shapes and various sizes. Specifically, the shape of the casing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the casing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0102] The end cap 212 refers to 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 fit 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 electrode terminals 23 can be provided on the end cap 212. The electrode terminals can be used for electrical connection with the electrode assembly 22 to output or input the electrical energy of the battery cell 20. The material of the end cap 212 can also be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 212. 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.

[0103] 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 usually an isolation film is provided between the positive electrode plate and the negative electrode plate. The isolation film is used 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 to a certain extent. 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.

[0104] Please refer to Figure 3 and further refer to Figure 4 Figure 4 which is a partial structural schematic diagram of the battery cell provided by some embodiments of this application. Figure 4 As shown, it is a schematic diagram after the electrode tab is connected to the adapter and the adapter is connected to the electrode terminal during the assembly process of the battery cell. Figure 4 In [the figure], the number of electrode assemblies is two, and along the first direction, the first wall is located between the two electrode assemblies.

[0105] ​An embodiment of the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, an electrode terminal 23, and an adapter 24. The housing 21 includes a first wall 213; the electrode assembly 22 is disposed within the housing 21, and the electrode assembly 22 has a tab 221; the electrode terminal 23 is disposed on the first wall 213; the adapter 24 includes a first portion 241 and a second portion 242 connected to each other, the first portion 241 is welded to the electrode terminal 23 to form a first welding portion 251, and the second portion 242 is welded to the tab 221 to form a second welding portion 252; wherein, in the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first welding portion 251 is a first projection 253, and the orthographic projection of the second welding portion 252 is a second projection 254; along a first direction X, the first projection 253 and the second projection 254 at least partially overlap, and the first direction X is perpendicular to the thickness direction Z of the first wall.

[0106] The housing 21 may include a housing body 211 and an end cap 212, the housing body 211 has an opening, and the end cap 212 covers the opening. The first wall 213 may be a wall portion of the housing body 211, or the first wall 213 may be the end cap 212.

[0107] In some embodiments, the first wall 213 is the end cap 212.

[0108] In some embodiments, the electrode terminal 23 may be insulatingly disposed on the first wall 213. For example, an insulating structure may be provided between the electrode terminal 23 and the first wall 213.

[0109] The first direction X may be parallel to the width direction (or thickness direction) of the battery cell 20.

[0110] In some embodiments, the electrode terminal 23 may include 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 in a second direction Y, and the second direction Y may be parallel to the length direction of the battery cell 20. The tabs 221 include a positive tab 221a and a negative tab 221b, the adapter 24 includes a positive adapter 24a and a negative adapter 24b, the positive adapter 24a electrically connects the positive electrode terminal 23a and the positive tab 221a, and the negative adapter 24b electrically connects the negative electrode terminal 23b and the negative tab 221b.

[0111] For ease of description, when the polarities of the adapter 24, the tab 221, and the electrode terminal 23 are not defined in the embodiments of the present application, the polarities of the adapter 24, the tab 221, and the electrode terminal 23 are the same. For example, the positive adapter 24a connects the positive tab 221a and the positive electrode terminal 23a, and the negative adapter 24b connects the negative tab 221b and the negative electrode terminal 23b.

[0112] In some embodiments, the first wall 213 is provided with a first through hole, and the electrode terminal 23 is connected to the adapter 24 through the first through hole. For example, a part of the electrode terminal 23 extends into the first through hole to be connected to the adapter 24.

[0113] In some embodiments, the electrode assembly 22 can be flat. The electrode assembly 22 can be a wound structure, in which the positive electrode plate, the negative electrode plate, and the separator are wound and then flattened to form a flat electrode assembly 22; alternatively, the electrode assembly 22 can be a stacked structure.

[0114] In some embodiments, the battery cell 20 can be a square shell battery cell, and the first wall 213 can be in the shape of a cuboid.

[0115] The adapter 24 can be a conductive member, and the material of the adapter 24 can be copper, aluminum, etc.

[0116] The first part 241 is the part of the adapter 24 for connecting to the electrode terminal 23, and the second part 242 is the part of the adapter 24 for connecting to the tab 221. The first part 241 and the second part 242 can be integrally formed.

[0117] Projecting along the thickness direction Z of the first wall, the orthographic projection of the first welding part 251 is the first projection 253, and the orthographic projection of the second welding part 252 is the second projection 254. "Along the first direction X, the first projection 253 and the second projection 254 at least partially overlap" means that the first projection 253 and the second projection 254 partially overlap, or the first projection 253 and the second projection 254 completely overlap.

[0118] On the same projection plane perpendicular to the thickness direction Z of the first wall, along the first direction X, the orthographic projections of the first part 241 and the second part 242 at least partially overlap, so that the first projection 253 and the second projection 254 at least partially overlap.

[0119] In some embodiments, the adapter 24 can be a flat plate, and the first part 241 and the second part 242 are coplanar.

[0120] In some embodiments, the adapter 24 can be a bent structure, and the first part 241 and the second part 242 are not coplanar.

[0121] In some embodiments, the thickness direction of the adapter 24 is parallel to the thickness direction Z of the first wall.

[0122] For the battery cell 20 according to the embodiments of the present application, in the same projection plane perpendicular to the thickness direction Z of the first wall, along the first direction X, the first projection 253 and the second projection 254 at least partially overlap. When the current flows from the first welding portion 251 to the second welding portion 252 or from the second welding portion 252 to the first welding portion 251, the current can flow along the first direction X, and the flow path of the current in the adapter 24 is short, which can improve the current-carrying capacity of the adapter 24, thereby improving the charge and discharge cycle performance of the battery cell 20.

[0123] Please refer to Figure 5 , Figure 5 FIG. is a schematic diagram of the first projection and the second projection provided by some embodiments of the present application. According to some embodiments of the present application, in the same projection plane perpendicular to the thickness direction Z of the first wall, along the first direction X, the first projection 253 and the second projection 254 have an overlapping area, and the orthographic projection of the part of the adapter 24 in the overlapping area is continuously distributed.

[0124] The overlapping area refers to the area where the first projection 253 and the second projection 254 overlap when observed along the first direction X.

[0125] The part of the adapter 24 in the overlapping area may be the transition portion 244 connecting the first portion 241 and the second portion 242 of the adapter 24. In the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the transition portion 244 is the third projection 255, and the third projection 255 is continuously distributed. Specifically, in a cross-section parallel to the first direction X and passing through the first welding portion 251 and the second welding portion 252 at the same time, the cross-section of the adapter 24 is continuous in the first direction X. It should be noted that the "cross-section of the adapter 24 is continuous in the first direction X" mentioned here means that the cross-section of the adapter 24 is uninterrupted in the first direction X. The cross-section of the adapter 24 may be in a semi-filled state. For example, the cross-section of the adapter 24 has grooves, notches, etc.; or the cross-section of the adapter 24 may be in a fully filled state.

[0126] When the current flows between the first welding portion 251 and the second welding portion 252, the current flows in this overlapping area, which can shorten the flow path of the current between the first welding portion 251 and the second welding portion 252, so that the current has a short flow path, which is convenient for improving the current-carrying capacity of the adapter 24.

[0127] Please refer to Figure 5 , according to some embodiments of the present application, the second portion 242 is located on one side of the first portion 241 along the first direction X, and the first direction X is parallel to the width direction of the first wall 213.

[0128] The first wall 213 can be in the shape of a cuboid. The width direction of the first wall 213 is parallel to the first direction X, and the length direction of the first wall 213 is perpendicular to the first direction X.

[0129] The second part 242 and the first part 241 are distributed along the first direction X.

[0130] In the above solution, the second part 242 is located on one side of the first part 241 along the width direction of the first wall. Moreover, in the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first part 241 and the orthographic projection of the second part 242 at least partially overlap. The space occupied by the first part 241 and the second part 242 in the length direction of the first wall is small, and the size of the tab 221 in the length direction of the first wall 213 can be large, so as to improve the current-carrying capacity between the tab 221 and the adapter 24.

[0131] According to some embodiments of the present application, along the second direction Y, the size of the second part 242 is greater than or equal to 20 mm and less than or equal to 50 mm. The second direction Y, the first direction X, and the thickness direction Z of the first wall are perpendicular to each other in pairs, and the second direction Y is parallel to the length direction of the first wall 213.

[0132] For example, the size of the second part 242 along the second direction Y can be any one of 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 34 mm, 36 mm, 38 mm, 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, 50 mm or the range between any two of them.

[0133] In some embodiments, the size of the second welding part 252 along the second direction Y can be greater than or equal to 10 mm and less than or equal to 25 mm. For example, the size of the second welding part 252 along the second direction Y can be any one of 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm or the range between any two of them.

[0134] In the above solution, the size of the second part 242 along the second direction Y satisfies the above relationship (greater than or equal to 20 mm and less than or equal to 50 mm). On the one hand, the size of the tab 221 in the second direction Y can be large, so as to improve the current-carrying capacity between the tab 221 and the adapter 24. On the other hand, the space occupied by the second part 242 in the second direction Y is small, reducing the interference between the adapter 24 and other components (such as insulating parts, pressure relief mechanisms, etc.).

[0135] Please refer to Figures 6 to 8 , Figure 6Assembly schematic diagram of the adapter and the first wall provided by some embodiments of the present application Figure 7 Assembly schematic diagram of the adapter and the first wall provided by other embodiments of the present application Figure 8 Assembly schematic diagram of the adapter and the first wall provided by still other embodiments of the present application. According to some embodiments of the present application, the first wall 213 has a first edge 213a and a second edge 213b oppositely arranged in the second direction Y; the second part 242 has a first end 242a close to the first edge 213a and a second end 242b close to the second edge 213b, and the first part 241 has a third end 241a close to the first edge 213a and a fourth end 241b close to the second edge 213b; as Figure 6 shown, along the direction from the second edge 213b to the first edge 213a, the first end 242a extends beyond the third end 241a; and / or, as Figure 7 shown, along the direction from the first edge 213a to the second edge 213b, the second end 242b extends beyond the fourth end 241b; the second direction Y, the first direction X and the thickness direction Z of the first wall are perpendicular to each other in pairs, and the second direction Y is parallel to the length direction of the first wall 213.

[0136] The first edge 213a and the second edge 213b are respectively located at both ends of the first wall 213 in the second direction Y. In some embodiments, the first edge 213a and the second edge 213b may be arranged in parallel.

[0137] The first end 242a and the second end 242b are opposite ends of the second part 242 in the second direction Y. The first end 242a is correspondingly arranged with the first edge 213a, the first end 242a is closer to the first edge 213a than the second end 242b, the second end 242b is correspondingly arranged with the second edge 213b, and the second end 242b is closer to the second edge 213b than the first end 242a.

[0138] The third end 241a and the fourth end 241b are opposite ends of the first part 241 in the second direction Y. The third end 241a is correspondingly arranged with the first edge 213a, the third end 241a is closer to the first edge 213a than the fourth end 241b, the fourth end 241b is correspondingly arranged with the second edge 213b, and the fourth end 241b is closer to the second edge 213b than the third end 241a.

[0139] As Figure 6 shown, when "along the direction from the second edge 213b to the first edge 213a, the first end 242a extends beyond the third end 241a", along the direction from the first edge 213a to the second edge 213b, the second end 242b may be flush with the fourth end 241b, so that the second part 242 has a larger size in the second direction Y.

[0140] As Figure 7 shown, when "in the direction pointing from the first edge 213a to the second edge 213b, the second end 242b extends beyond the fourth end 241b", in the direction pointing from the second edge 213b to the first edge 213a, the first end 242a can be flush with the third end 241a, so that the second part 242 has a larger dimension in the second direction Y.

[0141] As Figure 8 shown, when "in the direction pointing from the second edge 213b to the first edge 213a, the first end 242a extends beyond the third end 241a, and in the direction pointing from the first edge 213a to the second edge 213b, the second end 242b extends beyond the fourth end 241b", the dimension of the second part 242 in the second direction Y is larger than the dimension of the first part 241 in the second direction Y. The tab 221 can be set to have a larger dimension in the second direction Y, so that the tab 221 and the adapter 24 have a larger connection area, improving the current-carrying capacity between the tab 221 and the adapter 24.

[0142] In the above solution, the second part 242 has a larger dimension in the second direction Y, reasonably utilizing the space inside the battery cell 20 in the second direction Y. The tab 221 can have a larger dimension in the second direction Y. When observed along the first direction X, the second projection 254 and the first projection 253 have a larger overlapping area. For example, when observed along the first direction X, the second projection 254 can cover the entire first projection 253, which can shorten the current flow path in the adapter 24 and improve the current-carrying capacity of the adapter 24. At the same time, the first part 241 has a smaller dimension in the second direction Y to facilitate reducing the risk of interference between the electrode terminal 23 and other components.

[0143] Please refer to Figure 9 , Figure 9 which is a schematic assembly diagram of the adapter and the first wall provided by some other embodiments of the present application. According to some embodiments of the present application, the first wall 213 has a first edge 213a and a second edge 213b that are oppositely arranged in the second direction Y; the second part 242 has a first end 242a close to the first edge 213a and a second end 242b close to the second edge 213b, the first part 241 has a third end 241a close to the first edge 213a and a fourth end 241b close to the second edge 213b. In the direction pointing from the second edge 213b to the first edge 213a, the first end 242a and the third end 241a are flush. In the direction pointing from the first edge 213a to the second edge 213b, the second end 242b and the fourth end 241b are flush; the second direction Y, the first direction X, and the thickness direction Z of the first wall are perpendicular to each other in pairs, and the second direction Y is parallel to the length direction of the first wall 213.

[0144] The first edge 213a and the second edge 213b are respectively located at two ends of the first wall 213 in the second direction Y. In some embodiments, the first edge 213a and the second edge 213b may be arranged in parallel.

[0145] The first end 242a and the second end 242b are two ends of the second part 242 oppositely arranged in the second direction Y. The first end 242a is correspondingly arranged with the first edge 213a, the first end 242a is closer to the first edge 213a than the second end 242b, the second end 242b is correspondingly arranged with the second edge 213b, and the second end 242b is closer to the second edge 213b than the first end 242a.

[0146] The third end 241a and the fourth end 241b are two ends of the first part 241 oppositely arranged in the second direction Y. The third end 241a is correspondingly arranged with the first edge 213a, the third end 241a is closer to the first edge 213a than the fourth end 241b, the fourth end 241b is correspondingly arranged with the second edge 213b, and the fourth end 241b is closer to the second edge 213b than the third end 241a.

[0147] "In the direction pointing from the second edge 213b to the first edge 213a, the first end 242a and the third end 241a are flush. In the direction pointing from the first edge 213a to the second edge 213b, the second end 242b and the fourth end 241b are flush" means that in the same projection plane perpendicular to the thickness direction Z of the first wall, along the first direction X, the orthographic projection of the first part 241 completely overlaps with the orthographic projection of the second part 242.

[0148] In the above solution, the first end 242a and the third end 241a are flush, and the second end 242b and the fourth end 241b are flush, which is convenient for processing and manufacturing. At the same time, along the first direction X, the second projection 254 and the first projection 253 can have a large overlapping area, so as to shorten the flow path of the current in the adapter 24 and improve the current-carrying capacity of the adapter 24.

[0149] Please refer to Figure 10 , Figure 10Schematic diagrams of a first projection and a second projection provided for other embodiments of the present application. According to some embodiments of the present application, the first wall 213 has a first edge 213a and a second edge 213b that are oppositely disposed in the second direction Y. The second direction Y, the first direction X, and the thickness direction Z of the first wall are perpendicular to each other in pairs, and the second direction Y is parallel to the length direction of the first wall 213; in the same projection plane perpendicular to the thickness direction Z of the first wall, the first projection 253 has a third edge 253a close to the first edge 213a and a fourth edge 253b close to the second edge 213b, and the second projection 254 has a fifth edge 254a close to the first edge 213a and a sixth edge 254b close to the second edge 213b; along the direction from the second edge 213b to the first edge 213a, the third edge 253a does not extend beyond the fifth edge 254a, and along the direction from the first edge 213a to the second edge 213b, the fourth edge 253b does not extend beyond the sixth edge 254b; or, along the direction from the second edge 213b to the first edge 213a, the fifth edge 254a does not extend beyond the third edge 253a, and along the direction from the first edge 213a to the second edge 213b, the sixth edge 254b does not extend beyond the fourth edge 253b.

[0150] The first edge 213a and the second edge 213b are respectively located at both ends of the first wall 213 in the second direction Y. In some embodiments, the first edge 213a and the second edge 213b may be disposed in parallel.

[0151] In the same projection plane perpendicular to the thickness direction Z of the first wall, the third edge 253a and the fourth edge 253b are respectively located at both ends of the first projection 253 in the second direction Y. In some embodiments, the third edge 253a and the fourth edge 253b may be disposed in parallel.

[0152] In the same projection plane perpendicular to the thickness direction Z of the first wall, the fifth edge 254a and the sixth edge 254b are respectively located at both ends of the second projection 254 in the second direction Y. In some embodiments, the fifth edge 254a and the sixth edge 254b may be disposed in parallel.

[0153] "Along the direction from the second edge 213b to the first edge 213a, the third edge 253a does not extend beyond the fifth edge 254a" means that along the direction from the second edge 213b to the first edge 213a, the third edge 253a is flush with the fifth edge 254a, or the fifth edge 254a extends beyond the third edge 253a.

[0154] "In the direction pointing from the first edge 213a to the second edge 213b, the fourth edge 253b does not extend beyond the sixth edge 254b" means that in the direction pointing from the first edge 213a to the second edge 213b, the fourth edge 253b is flush with the sixth edge 254b, or the sixth edge 254b extends beyond the fourth edge 253b.

[0155] "In the direction pointing from the second edge 213b to the first edge 213a, the fifth edge 254a does not extend beyond the third edge 253a" means that in the direction pointing from the second edge 213b to the first edge 213a, the fifth edge 254a is flush with the third edge 253a, or the third edge 253a extends beyond the fifth edge 254a.

[0156] "In the direction pointing from the first edge 213a to the second edge 213b, the sixth edge 254b does not extend beyond the fourth edge 253b" means that in the direction pointing from the first edge 213a to the second edge 213b, the sixth edge 254b is flush with the fourth edge 253b, or the fourth edge 253b extends beyond the sixth edge 254b.

[0157] In the above solution, when "in the direction pointing from the second edge 213b to the first edge 213a, the third edge 253a does not extend beyond the fifth edge 254a, and in the direction pointing from the first edge 213a to the second edge 213b, the fourth edge 253b does not extend beyond the sixth edge 254b", the dimension of the second projection 254 in the second direction Y is greater than or equal to the dimension of the first projection 253 in the second direction Y. When observed along the first direction X, the second projection 254 can cover the entire first projection 253, which can shorten the flow path of the current in the adapter 24 and improve the current-carrying capacity of the adapter 24. When "in the direction pointing from the second edge 213b to the first edge 213a, the fifth edge 254a does not extend beyond the third edge 253a, and in the direction pointing from the first edge 213a to the second edge 213b, the sixth edge 254b does not extend beyond the fourth edge 253b", the dimension of the first projection 253 in the second direction Y is greater than or equal to the dimension of the second projection 254 in the second direction Y. When observed along the first direction X, the first projection 253 can cover the entire second projection 254, which can shorten the flow path of the current in the adapter 24 and improve the current-carrying capacity of the adapter 24.

[0158] Please refer to Figure 10 , according to some embodiments of the present application, along the first direction X, the first projection 253 and the second projection 254 completely overlap.

[0159] In the above solution, the first projection 253 and the second projection 254 completely overlap, and the flow path of the current when flowing between the first welding part 251 and the second welding part 252 is short, so as to facilitate improving the current-carrying capacity of the adapter 24.

[0160] Please refer to Figure 10 According to some embodiments of the present application, the number of the second parts 242 is two. Along the first direction X, the two second parts 242 are respectively connected to two ends of the first part 241; in the same projection plane perpendicular to the thickness direction Z of the first wall, along the first direction X, the first projection 253 is located between the two second projections 254.

[0161] Along the first direction X, the first part 241 is located between the two second parts 242. The tab 221 can be divided into two parts, and the two parts of the tab 221 are respectively connected to the two second parts 242. For example, when the number of the electrode assemblies 22 is one, the tab 221 is divided into two parts in the first direction X, and the two parts of the tab 221 are respectively connected to the two second parts 242; or, when the number of the electrode assemblies 22 is two, the tabs 221 of the two electrode assemblies 22 are divided into two parts, the tab 221 of one electrode assembly 22 can be connected to one second part 242, and the tab 221 of the other electrode assembly 22 can be connected to the other second part 242; or, when the number of the electrode assemblies 22 is an even number, the tabs 221 of the even number of electrode assemblies 22 are divided into two parts, half of the tabs 221 of the even number of electrode assemblies 22 are connected to one second part 242, and the other half of the tabs 221 are connected to the other second part 242.

[0162] The two second projections 254 can be arranged in parallel with each other, and along the first direction X, the two second projections 254 completely overlap.

[0163] In some embodiments, along the first direction X, the first projection 253 is arranged between the two second projections 254, and the second projection 254 can completely overlap with the first projection 253.

[0164] In the above solution, the two second parts 242 are located at two ends of the first part 241 in the first direction X, so as to be connected to the tabs 221 of the electrode assemblies 22 at different positions in the first direction X, and the space inside the battery cell 20 in the first direction X is reasonably utilized.

[0165] Please refer to Figure 3 and Figure 4 According to some embodiments of the present application, the number of the electrode assemblies 22 is two, the two electrode assemblies 22 are stacked along the first direction X, and the tabs 221 of the two electrode assemblies 22 are respectively connected to the two second parts 242.

[0166] The structures of the two electrode assemblies 22 are the same, and the tabs 221 of the two electrode assemblies 22 are arranged in one-to-one correspondence with the two second parts 242, so that the tabs 221 of the two electrode assemblies 22 are respectively connected to the two second parts 242.

[0167] In the above solution, two electrode assemblies 22 are stacked inside the housing 21. The battery cell 20 can be provided with more active materials to increase the energy density of the battery cell 20. The tabs 221 of the two electrode assemblies 22 are respectively connected to the two second parts 242, facilitating the connection between the two electrode assemblies 22 and the adapter 24.

[0168] Please refer to Figure 3 , according to some embodiments of the present application, the housing 21 includes a housing body 211 and an end cap 212. The housing body 211 has an opening, and the end cap 212 covers the opening. The end cap 212 is the first wall 213; the number of electrode assemblies 22 is one, and the dimension of the housing body 211 in the first direction X is greater than or equal to 20 mm and less than or equal to 40 mm; or, the number of electrode assemblies 22 is two, and the two electrode assemblies 22 are stacked along the first direction X, and the dimension of the housing body 211 in the first direction X is greater than or equal to 35 mm and less than or equal to 90 mm; wherein, the first direction X is parallel to the width direction of the first wall 213.

[0169] In some embodiments, when the number of electrode assemblies 22 is one, the dimension of the housing body 211 in the first direction X can be any one or the range between any two of 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm.

[0170] In some embodiments, when the number of electrode assemblies 22 is two, the dimension of the housing body 211 in the first direction X can be any one or the range between any two of 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm.

[0171] In the above solution, when the number of electrode assemblies 22 is one, the dimension of the housing body 211 in the first direction X satisfies the above relationship (greater than or equal to 20 mm and less than or equal to 40 mm). The interior of the housing body 211 has a relatively large space in the first direction X, facilitating the arrangement of the tabs 221 and the electrode terminals 23 in the first direction X, and facilitating the processing and manufacturing of the electrode assembly 22. When the number of electrode assemblies 22 is two, the dimension of the housing body 211 in the first direction X satisfies the above relationship (greater than or equal to 35 mm and less than or equal to 90 mm). The interior of the housing body 211 has a relatively large space in the first direction X, facilitating the arrangement of the tabs 221 and the electrode terminals 23 in the first direction X. More active materials can be provided inside the housing body 211, facilitating the increase of the energy density of the battery cell 20.

[0172] Please refer to Figure 3 , according to some embodiments of the present application, the housing 21 includes a housing body 211 and an end cover 212. The housing body 211 has an opening, and the end cover 212 covers the opening. The end cover 212 is the first wall 213; the dimension of the housing body 211 in the second direction Y is greater than or equal to 120 mm and less than or equal to 300 mm; the second direction Y, the first direction X, and the thickness direction Z of the first wall are perpendicular to each other in pairs, and the second direction Y is parallel to the length direction of the first wall 213.

[0173] In some embodiments, the second direction Y may be parallel to the length direction of the battery cell 20, and the dimension of the housing body 211 in the second direction Y may be the length of the battery cell 20.

[0174] The dimension of the housing body 211 in the second direction Y may be any one of 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, 300 mm or the range between any two of them.

[0175] In the above solution, the space occupied by the electrode terminal 23 and the tab 221 in the second direction Y is small. The dimension of the housing body 211 in the second direction Y satisfies the above relationship (greater than or equal to 120 mm and less than or equal to 300 mm), and the connection reliability between the end cover 212 and the housing body 211 is high.

[0176] Please refer to Figure 3 , and further refer to Figure 11 and Figure 12 , Figure 11 is a cross-sectional view of a part of the structure of the battery cell provided by some embodiments of the present application, Figure 12 is Figure 11 a partial enlarged view of part A of . According to some embodiments of the present application, the battery cell 20 further includes a first insulating member 26. Along the thickness direction Z of the first wall, at least a part of the first insulating member 26 is disposed between the first wall 213 and the adapter 24; the first wall 213 is provided with a first through hole 2131, and a part of the electrode terminal 23 is disposed in the first through hole 2131. The first insulating member 26 has a first surface 261 facing away from the first wall 213. Along the direction from the first wall 213 to the electrode assembly 22, the electrode terminal 23 protrudes from the first surface 261; the adapter 24 further includes a bending portion 243. The second portion 242 and the first portion 241 are connected by the bending portion 243. Along the thickness direction Z of the first wall, the first portion 241 protrudes from the second portion 242 in a direction away from the first wall 213.

[0177] The first through hole 2131 penetrates through the first wall 213 along the thickness direction Z of the first wall, so as to facilitate the electrode terminal 23 to extend into the battery cell 20 to be connected to the tab 221.

[0178] In some embodiments, the entirety of the first insulating member 26 may be disposed between the first wall 213 and the adapter 24; alternatively, a part of the first insulating member 26 may be disposed between the first wall 213 and the adapter 24, and another part of the first insulating member 26 may be disposed within the first through-hole 2131.

[0179] A part of the electrode terminal 23 is disposed within the first through-hole 2131. One end of the electrode terminal 23 is located on the side of the first wall 213 facing away from the interior of the battery cell 20, and the other end of the electrode terminal 23 is located on the side of the first wall 213 facing the interior of the battery cell 20.

[0180] The first surface 261 is the surface of the first insulating member 26 facing away from the first wall 213.

[0181] The electrode terminal 23 has a first end face 231 located inside the battery cell 20. The first end face 231 is the end face of the electrode terminal 23 closest to the interior of the battery cell 20. Along the direction from the first wall 213 to the electrode assembly 22, the first end face 231 protrudes from the first surface 261, and the first end face 231 is farther from the first wall 213 than the first surface 261.

[0182] In some embodiments, the adapter 24 is an integrally formed bent structure. For example, the adapter 24 may be formed by stamping a sheet. The bent portion 243 is bent relative to the first portion 241, and the second portion 242 is bent relative to the bent portion 243. The first portion 241 may be parallel to the second portion 242; in the thickness direction Z of the first wall, the second portion 242 is closer to the first wall 213 than the first portion 241.

[0183] In the above solution, a part of the electrode terminal 23 is disposed within the first through-hole 2131, and the electrode terminal 23 protrudes from the first surface 261. The electrode terminal 23 is disposed towards the interior of the battery cell 20. The first portion 241 protrudes from the second portion 242 in the direction away from the first wall 213. The electrode terminal 23 is connected to the first portion 241, and the tab 221 is connected to the second portion 242. By utilizing the space inside the battery cell 20 in the thickness direction Z of the first wall, it is convenient to reduce the overall height of the battery cell 20.

[0184] Please refer to Figure 12 , according to some embodiments of the present application, along the thickness direction Z of the first wall, the tab 221 is located on the side of the second portion 242 facing away from the first insulating member 26.

[0185] The second portion 242 is closer to the first wall 213 than the first portion 241. The tab 221 is located on the side of the second portion 242 facing away from the first insulating member 26. Along the first direction X, a part of the tab 221 overlaps with the bent portion 243.

[0186] The tab 221 is located on the side of the second part 242 away from the first insulating member 26. During the assembly process of the battery cell 20, the tab 221 can be welded to the second part 242, and the first part 241 can be welded to the electrode terminal 23 in the direction from the inner surface of the first wall 213 to the outer surface of the first wall 213.

[0187] In the above solution, the tab 221 is located on the side of the second part 242 away from the first insulating member 26, which is convenient for assembly and can reduce the risk of interference between the tab 221 and the first insulating member 26.

[0188] Please refer to Figure 12 , according to some embodiments of the present application, along the thickness direction Z of the first wall, the distance between the second part 242 and the first insulating member 26 is greater than or equal to 0.1 mm and less than or equal to the dimension of the second part 242 along the thickness direction Z of the first wall.

[0189] In some embodiments, the thickness direction of the adapter 24 is parallel to the thickness direction Z of the first wall, the thickness direction of the second part 242 is parallel to the thickness direction of the adapter 24, and the dimension of the second part 242 along the thickness direction Z of the first wall can be the thickness of the second part 242.

[0190] For the sake of convenience of description, the dimension indicated by the letter H1 is: the distance between the second part 242 along the thickness direction Z of the first wall and the first insulating member 26; the dimension indicated by the letter H2 is the dimension of the second part 242 along the thickness direction Z of the first wall, satisfying 0.1 mm ≤ H1 ≤ H2.

[0191] For example, H1 can be any value between 0.1 mm and H2.

[0192] Along the thickness direction Z of the first wall, there may be a gap between the second part 242 and the first insulating member 26 to facilitate the assembly of the adapter 24 and the first insulating member 26.

[0193] In the above solution, the distance between the second part 242 and the first insulating member 26 satisfies the above relationship. On the one hand, it reserves an assembly space, adapts to processing errors, and reduces the risk of interference between the tab and the first insulating member. On the other hand, it reduces the waste of space in the thickness direction of the first wall.

[0194] Please refer to Figure 13 , Figure 13 For Figure 4 is a partial enlarged view of part A in . According to some embodiments of the present application, along the second direction Y, the distance between the center of the first projection 253 and the center of the second projection 254 is not greater than 30 mm, and the first direction X, the second direction Y, and the thickness direction Z of the first wall are perpendicular to each other in pairs.

[0195] The center of the first projection 253 refers to the center of the first projection 253 in the second direction Y. The center of the second projection 254 refers to the center of the second projection 254 in the second direction Y.

[0196] For ease of description, the dimension indicated by the letter L represents the distance between the center of the first projection 253 in the second direction Y and the center of the second projection 254 in the second direction Y, satisfying 0 < L ≤ 30 mm.

[0197] Optionally, 0 < L ≤ 10 mm.

[0198] For example, the distance L between the center of the first projection 253 in the second direction Y and the center of the second projection 254 in the second direction Y can be any one of the point values of 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm or the range between any two of these point values.

[0199] In the above solution, the distance between the center of the first projection 253 in the second direction Y and the center of the second projection 254 in the second direction Y satisfies the above relationship. Along the first direction X, the first projection 253 and the second projection 254 have a large overlapping area, and the flow path of the current between the first welding part 251 and the second welding part 252 is short, which is convenient for improving the current-carrying capacity of the adapter 24.

[0200] According to some embodiments of the present application, embodiments of the present application further provide a battery 100, which includes a battery cell 20 provided in any of the above embodiments.

[0201] According to some embodiments of the present application, embodiments of the present application further provide an electrical device, which includes a battery cell 20 or a battery 100 provided in any of the above embodiments, and the battery cell 20 or the battery 100 is used to provide electrical energy.

[0202] The electrical device can be any of the above devices or systems that apply the battery cell 20 or the battery.

[0203] According to some embodiments of the present application, please refer to Figures 3 to 13 , embodiments of the present application provide a battery cell 20, and the battery cell 20 is a square-shell battery cell. The battery cell 20 includes a housing 21, an electrode assembly 22, an electrode terminal 23, an adapter 24, and a first insulating member 26.

[0204] The housing 21 has a housing body 211 and an end cap 212. The housing body 211 has an opening, and the end cap 212 covers the opening. The housing 21 includes a first wall 213, and the electrode terminal 23 is disposed on the first wall 213, and the first wall 213 is the end cap 212.

[0205] The electrode assembly 22 has a tab 221. The adapter 24 includes a first part 241 and a second part 242 that are connected to each other. The first part 241 is welded to the electrode terminal 23 to form a first welding part 251, and the second part 242 is welded to the tab 221 to form a second welding part 252.

[0206] In the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first welding part 251 is a first projection 253, and the orthographic projection of the second welding part 252 is a second projection 254. Along the first direction X, the first projection 253 and the second projection 254 at least partially overlap.

[0207] The number of electrode terminals 23 is two. The two electrode terminals 23 include 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 in the second direction Y. The adapter 24 includes a positive adapter 24a and a negative adapter 24b. The tab 221 includes a positive tab 221a and a negative tab 221b. The positive adapter 24a connects the positive electrode terminal 23a and the positive tab 221a, and the negative adapter 24b connects the negative electrode terminal 23b and the negative tab 221b.

[0208] Along the second direction Y, one end of the second part 242 of the positive adapter 24a close to the negative electrode terminal 23b extends beyond the first part 241 of the positive adapter 24a, and one end of the second part 242 of the negative adapter 24b close to the positive electrode terminal 23a extends beyond the first part 241 of the negative adapter 24b.

[0209] The first wall 213 is provided with a first through hole 2131. A part of the electrode terminal 23 is disposed in the first through hole 2131. The first insulating member 26 has a first surface 261 facing away from the first wall 213. Along the direction from the first wall 213 to the electrode assembly 22, the electrode terminal 23 protrudes from the first surface 261. The adapter 24 is a bent structure. The adapter 24 further includes a bent part 243. The second part 242 and the first part 241 are connected by the bent part 243. Along the thickness direction Z of the first wall, the first part 241 protrudes from the second part 242 in the direction away from the first wall 213. At least a part of the first insulating member 26 is disposed between the first wall 213 and the adapter 24. Along the thickness direction Z of the first wall, the tab 221 is located on the side of the second part 242 away from the first insulating member 26.

[0210] For the battery cell 20 according to an embodiment of the present application, on the same projection plane perpendicular to the thickness direction Z of the first wall, along the first direction X, the first projection 253 and the second projection 254 at least partially overlap. When the current flows from the first welding portion 251 to the second welding portion 252 or from the second welding portion 252 to the first welding portion 251, the current can flow along the first direction X, and the flow path of the current in the adapter 24 is relatively short, which can improve the overcurrent capacity of the adapter 24, thereby improving the charge and discharge cycle performance of the battery cell 20. The adapter 24 is an integrally formed structure, which is convenient for processing and manufacturing. One end of the electrode terminal 23 passes through the first wall 213 and extends into the housing 21, which is convenient for reducing the space occupied by the battery cell 20 in the thickness direction Z of the first wall.

[0211] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it and components therein 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 way. The present application is not limited to the specific embodiments disclosed in the text, 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 assembly is disposed in the housing, and the electrode assembly has a tab; an electrode terminal, disposed on the first wall; The adapter comprises a first portion and a second portion connected to each other, wherein the first portion is welded to the electrode terminal to form a first welding portion, and the second portion is welded to the electrode tab to form a second welding portion; Wherein, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first welding portion is the first projection, and the orthographic projection of the second welding portion is the second projection; The first projection and the second projection at least partially overlap along a first direction, and the first direction is perpendicular to a thickness direction of the first wall.

2. The battery cell according to claim 1, characterized in that: On the same projection plane perpendicular to the thickness direction of the first wall, along the first direction, the first projection and the second projection have an overlapping area, and the orthographic projections of the portion of the adapter in the overlapping area are continuously distributed.

3. The battery cell according to claim 1, characterized in that: The second portion is located at one side of the first portion along the first direction, and the first direction is parallel to a width direction of the first wall.

4. The battery cell according to claim 1, characterized in that: Along the second direction, the size of the second portion is greater than or equal to 20 mm and less than or equal to 50 mm, the second direction, the first direction and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.

5. The battery cell according to claim 1, characterized in that: The first wall has a first edge and a second edge disposed opposite to each other in a second direction; The second portion has a first end close to the first edge and a second end close to the second edge, and the first portion has a third end close to the first edge and a fourth end close to the second edge; Along the direction from the second edge to the first edge, the first end exceeds the third end; and / or, Along the direction from the first edge to the second edge, the second end exceeds the fourth end; The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.

6. The battery cell according to claim 1, characterized in that: The first wall has a first edge and a second edge disposed opposite to each other in a second direction; The second portion has a first end close to the first edge and a second end close to the second edge, and the first portion has a third end close to the first edge and a fourth end close to the second edge; Along the direction from the second edge to the first edge, the first end is flush with the third end, and along the direction from the first edge to the second edge, the second end is flush with the fourth end; The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.

7. The battery cell according to claim 1, characterized in that: The first wall has a first edge and a second edge arranged opposite to each other in a second direction, the second direction, the first direction and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall; On the same projection plane perpendicular to the thickness direction of the first wall, the first projection has a third edge close to the first edge and a fourth edge close to the second edge, and the second projection has a fifth edge close to the first edge and a sixth edge close to the second edge; Along the direction from the second edge to the first edge, the third edge does not exceed the fifth edge, and along the direction from the first edge to the second edge, the fourth edge does not exceed the sixth edge; or, Along the direction from the second edge to the first edge, the fifth edge does not exceed the third edge, and along the direction from the first edge to the second edge, the sixth edge does not exceed the fourth edge.

8. The battery cell according to claim 1, characterized in that: Along the first direction, the first projection and the second projection completely overlap.

9. The battery cell according to claim 1, characterized in that: The number of the second parts is two, and along the first direction, the two second parts are respectively connected to two ends of the first part; On the same projection plane perpendicular to the thickness direction of the first wall, along the first direction, the first projection is located between the two second projections.

10. The battery cell according to claim 9, characterized in that: The number of the electrode assemblies is two, the two electrode assemblies are stacked along the first direction, and the electrode tabs of the two electrode assemblies are respectively connected to the two second portions.

11. The battery cell according to claim 1, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is the first wall; The number of the electrode assembly is one, and the size of the shell in the first direction is greater than or equal to 20 mm and less than or equal to 40 mm; or, The number of the electrode assemblies is two, the two electrode assemblies are stacked along the first direction, and the size of the shell in the first direction is greater than or equal to 35 mm and less than or equal to 90 mm; The first direction is parallel to the width direction of the first wall.

12. The battery cell according to claim 1, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is the first wall; The size of the housing in the second direction is greater than or equal to 120 mm and less than or equal to 300 mm; The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.

13. The battery cell according to claim 1, characterized in that: The battery cell further comprises: a first insulating member, along a thickness direction of the first wall, wherein at least a portion of the first insulating member is disposed between the first wall and the adapter; The first wall is provided with a first through hole, a part of the electrode terminal is provided in the first through hole, the first insulating member has a first surface away from the first wall, and the electrode terminal protrudes from the first surface along the first wall toward the direction of the electrode assembly; The adapter also includes a bending portion, and the second portion is connected to the first portion via the bending portion. Along the thickness direction of the first wall, the first portion protrudes from the second portion in a direction away from the first wall.

14. The battery cell according to claim 13, characterized in that: Along the thickness direction of the first wall, the pole tab is located on a side of the second portion away from the first insulating member.

15. The battery cell according to claim 14, characterized in that: Along the thickness direction of the first wall, a distance between the second portion and the first insulating member is greater than or equal to 0.1 mm and less than or equal to a dimension of the second portion along the thickness direction of the first wall.

16. The battery cell according to claim 1, characterized in that: Along the second direction, the distance between the center of the first projection and the center of the second projection is no more than 30 mm, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

17. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 16.

18. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 16 or the battery according to claim 17, wherein the battery cell or the battery is used to provide electrical energy.

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