Battery monomer, battery and electric equipment

Abstract

The embodiment of the invention 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

Battery cell, battery and electric device TECHNICAL FIELD

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

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

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

[0004] SUMMARY

[0005] The present application provides a battery cell, a battery and an electric device, which can improve the charge-discharge cycle performance of the battery cell.

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

[0007] In a first aspect, the present application provides a battery cell, which 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 has a tab; the electrode terminal is arranged on the first wall; the adapter comprises a first part and a second part connected to 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, in the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first welding part is a first projection, and the orthographic projection of the second connection part is a second projection; along a 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.

[0008] According to the battery cell of the present application, in 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, the flow path of the current in the adapter is shorter, and the overcurrent capacity of the adapter can be improved, thereby improving the charge-discharge cycle performance of the battery cell.

[0009] According to some embodiments of the present application, in 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 part of the adapter in the overlapping area is continuously distributed.

[0010] In the above scheme, in a cross section parallel to the first direction and passing through the first welding part and the second welding part, the cross section of the adapter is continuous in the first direction, so that when the current flows between the first welding part and the second welding part, the current has a shorter flow path, facilitating improvement of the current carrying capacity of the adapter.

[0011] According to some embodiments of the present application, the second part is located on one side of the first part along the first direction, and the first direction is parallel to the width direction of the first wall.

[0012] In the above scheme, the second part is located on one side of the first part along the width direction of the first wall, and the first part and the second part occupy a smaller space in the length direction of the first wall, so that the size of the tab in the length direction of the first wall can be larger, facilitating improvement of the current carrying capacity between the tab and the adapter.

[0013] According to some embodiments of the present application, in the second direction, the size of the second part 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.

[0014] In the above scheme, the size of the second part in the second direction satisfies the above relationship, on the one hand, the size of the tab in the second direction can be larger, facilitating improvement of the current carrying capacity between the tab and the adapter, and on the other hand, the second part occupies a smaller space in the second direction, reducing the interference between the adapter and other components (such as insulating parts, pressure relief mechanisms, etc.).

[0015] 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 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; in the direction of the first edge pointing to the second edge, the first end exceeds the third end; and / or, in the direction of the second edge pointing to the first 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.

[0016] In the above scheme, the second part has a larger size in the second direction, reasonably utilizing the space inside the battery monomer in the second direction, and the size of the tab in the second direction can be larger, and when observed in the first direction, the second projection has a larger overlapping area with the first projection, for example, the second projection can cover the entire first projection when observed in the first direction, 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 part has a smaller size in the second direction, facilitating reduction of the risk of interference between the electrode terminal and other components.

[0017] According to some embodiments of the present application, the first wall has a first edge and a second edge opposite to each other 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; the first end and the third end are flush in a direction from the second edge to the first edge along the first edge, and the second end and the fourth end are flush in a direction from the first edge to the second edge along the second edge; 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.

[0018] In the above scheme, the first end and the third end are flush, and the second end and the fourth end are flush, which facilitates processing and manufacturing. Meanwhile, along the first direction, the second projection and the first projection can have a larger overlapping area, so as to shorten the flow path of the current in the adapter and improve the current carrying capacity of the adapter.

[0019] According to some embodiments of the present application, the first wall has a first edge and a second edge opposite to each other in the 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; 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; in a direction from the second edge to the first edge along the second edge, the third edge does not exceed the fifth edge, and in a direction from the first edge to the second edge along the first edge, the fourth edge does not exceed the sixth edge; or, in a direction from the second edge to the first edge along the second edge, the fifth edge does not exceed the third edge, and in a direction from the first edge to the second edge along the first edge, the sixth edge does not exceed the fourth edge.

[0020] In the above scheme, when “in a direction from the second edge to the first edge along the second edge, the third edge does not exceed the fifth edge, and in a direction from the first edge to the second edge along the first edge, the fourth edge does not exceed 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, and the second projection can cover the entire first projection when viewed along the first direction, which can shorten the flow path of the current in the adapter and improve the current carrying capacity of the adapter. When “in a direction from the second edge to the first edge along the second edge, the fifth edge does not exceed the third edge, and in a direction from the first edge to the second edge along the first edge, the sixth edge does not exceed 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, and the first projection can cover the entire second projection when viewed along the first direction, which can shorten the flow path of the current in the adapter and improve the current carrying capacity of the adapter.

[0021] According to some embodiments of the present application, the first projection and the second projection completely overlap along the first direction.

[0022] In the above scheme, the first projection and the second projection completely overlap, and the current flow path is short when the current flows between the first welding part and the second welding part, so as to improve the overcurrent capacity of the adapter.

[0023] According to some embodiments of the present application, the number of the second parts is two, and the two second parts are respectively connected to the two ends of the first part along the first direction; in the same projection plane perpendicular to the thickness direction of the first wall, the first projection is located between the two second projections along the first direction.

[0024] In the above scheme, the two second parts are located at the two ends of the first part in the first direction, so as to connect the tabs of the electrode assemblies at different positions in the first direction and reasonably utilize the space inside the battery monomer in the first direction.

[0025] According to some embodiments of the present application, the number of the electrode assemblies is two, and 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.

[0026] In the above scheme, the battery monomer can be provided with more active substances to improve the energy density of the battery monomer, and the tabs of the two electrode assemblies are respectively connected to the two second parts, so as to facilitate the connection of the two electrode assemblies and the adapter.

[0027] According to some embodiments of the present application, the shell includes a housing and an end cover, the housing 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 housing 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 housing 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.

[0028] In the above scheme, when the number of the electrode assemblies is one, the size of the housing in the first direction satisfies the above relationship (greater than or equal to 20 mm and less than or equal to 40 mm), the inside of the housing has a large space in the first direction, so as to arrange the tabs and the electrode terminals in the first direction, and facilitate the processing and manufacturing of the electrode assemblies. When the number of the electrode assemblies is two, the size of the housing in the first direction satisfies the above relationship (greater than or equal to 35 mm and less than or equal to 90 mm), the inside of the housing has a large space in the first direction, so as to arrange the tabs and the electrode terminals in the first direction, and the housing can be provided with more active substances to improve the energy density of the battery monomer.

[0029] According to some embodiments of the present application, the shell includes a housing and an end cover, the housing has an opening, the end cover covers the opening, and the end cover is a first wall; a dimension of the housing in a 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 a thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to a length direction of the first wall.

[0030] In the above scheme, the electrode terminal and the tab occupy a smaller space in the second direction, the dimension of the housing 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 end cover and the housing have higher connection reliability.

[0031] According to some embodiments of the present application, the battery monomer further includes a first insulating member, at least part of the first insulating member is arranged between the first wall and the adapter along the thickness direction of the first wall; the first wall is provided with a first through hole, part of the electrode terminal is arranged 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 direction of the first wall pointing to the electrode assembly; the adapter further includes a bending part, the second part is connected with the first part through the bending part, and the first part protrudes from the second part in a direction away from the first wall along the thickness direction of the first wall.

[0032] In the above scheme, part of the electrode terminal is arranged in the first through hole, and the electrode terminal protrudes from the first surface, the electrode terminal is arranged towards the inside of the battery monomer, the first part protrudes from the second part in a direction away from the first wall, the electrode terminal is connected with the first part, and the tab is connected with the second part, so that the space in the thickness direction of the first wall inside the battery monomer is utilized to facilitate reducing the overall height of the battery monomer.

[0033] According to some embodiments of the present application, along the thickness direction of the first wall, the tab is located on a side of the second part away from the first insulating member.

[0034] In the above scheme, the tab is located on the side of the second part away from the first insulating member, which facilitates assembly and reduces the risk of interference between the tab and the first insulating member.

[0035] According to some embodiments of the present application, along the thickness direction of the first wall, a distance between the second part 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 part in the thickness direction of the first wall.

[0036] In the above scheme, the distance between the second part and the first insulating member satisfies the above relationship, on the one hand, assembly space is reserved to adapt to processing errors and reduce the risk of interference between the tab and the first insulating member, and on the other hand, space waste in the thickness direction of the first wall is reduced.

[0037] According to some embodiments of the present application, the distance between the center of the first projection and the center of the second projection in the second direction is not greater than 30 mm, the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0038] In the above scheme, 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 larger overlapping area, the flow path of the current between the first welding part and the second welding part is shorter, and the overcurrent capacity of the adapter is facilitated to be improved.

[0039] In a second aspect, the embodiments of the present application further provide a battery cell.

[0040] In a third aspect, the embodiments of the present application further provide a use electric device, which comprises the battery cell or the battery provided by any of the above embodiments, and the battery cell or the battery is used to provide electric energy.

[0041] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0043] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0044] Fig. 2 is a structural exploded schematic diagram of a battery provided by some embodiments of the present application;

[0045] Fig. 3 is a structural exploded schematic diagram of a battery cell provided by some embodiments of the present application;

[0046] Fig. 4 is a partial structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0047] Fig. 5 is a schematic diagram of a first projection and a second projection provided by some embodiments of the present application;

[0048] Fig. 6 is an assembly schematic diagram of an adapter and a first wall provided by some embodiments of the present application;

[0049] Fig. 7 is an assembly schematic diagram of an adapter and a first wall provided by some other embodiments of the present application;

[0050] Fig. 8 is an assembly view of the adapter and the first wall according to some embodiments of the present application;

[0051] Fig. 9 is an assembly view of the adapter and the first wall according to some embodiments of the present application;

[0052] Fig. 10 is a schematic view of the first projection and the second projection according to some embodiments of the present application;

[0053] Fig. 11 is a cross-sectional view of a partial structure of a battery cell according to some embodiments of the present application;

[0054] Fig. 12 is an enlarged view of a portion of Fig. 11;

[0055] Fig. 13 is an enlarged view of a portion of Fig. 4;

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

[0057] Reference Signs: 100 - battery; 10 - case; 11 - first sub-case; 12 - second sub-case; 20 - battery cell; 21 - outer shell; 211 - housing; 212 - end cap; 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 surface; 24 - adapter; 24a - positive adapter; 24b - negative adapter; 241 - first portion; 241a - third end; 241b - fourth end; 242 - second portion; 242a - first end; 242b - second end; 243 - bent portion; 244 - transition portion; 251 - first welding portion; 252 - second welding portion; 253 - first projection; 253a - third edge; 253b - fourth edge; 254 - second projection; 254a - fifth edge; 254b - sixth edge; 255 - third projection; 26 - first insulator; 261 - first surface; 200 - controller; 300 - motor; 1000 - vehicle; X - first direction; Y - second direction; Z - thickness direction of the first wall. DETAILED DESCRIPTION

[0058] The embodiments of the present application will be described in further detail by the following examples in conjunction with the accompanying drawings and examples. The following detailed description and drawings are provided to illustrate the principles of the present application, and should not be interpreted in a limiting sense. The present application is not limited to the embodiments described herein.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. The description herein and the claims that follow use the terminology "including" and "comprising" and variations thereof to mean that the specified features are included or encompassed, but not exclusively. The description herein and the claims that follow use the terminology "first," "second," and the like in a generic sense only and not in a specific sense to connote or suggest any relative importance or preference.

[0060] Reference throughout this application to "embodiments" means embodiments described in connection with the embodiments as described in the application. The appearance of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood that the embodiments described in the application can be combined with each other.

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

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

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

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

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

[0066] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can be part of a floor of the vehicle, or portions of the box can be part of cross members and longitudinal members of the vehicle.

[0067] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, and the like.

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

[0069] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, and the like.

[0070] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode and can prevent the positive and negative electrodes from shorting to some extent, while allowing the active ions to pass through.

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

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

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

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

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0076] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, or the like can be employed.

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

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

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

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

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

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

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

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

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

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

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

[0088] 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 electrolyte leakage, etc. When the housing is a non-sealed structure, the housing can protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly for encapsulating the electrode assembly and electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

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

[0090] In some embodiments, the battery cell includes a housing, an electrode assembly, an electrode terminal, and an adapter. The electrode assembly is disposed in the housing, and the electrode terminal is disposed on a first wall of the housing. The adapter is disposed in the housing and electrically connects the electrode terminal and the tab of the electrode assembly. The adapter includes a first portion and a second portion connected to each other, the first portion is connected to the electrode terminal to form a first welding portion, and the second portion is connected to the tab to form a second welding portion. The first welding portion and the second welding portion are usually arranged staggered in a first direction, so that the flow path of the current between the first welding portion and the second welding portion is longer, the overcurrent capacity of the adapter is poorer, and the charge-discharge cycle performance of the battery cell is affected.

[0091] In view of this, in order to solve the problem that the poor flow capacity of the adapter leads to poor charge-discharge cycle performance of the battery monomer, the application provides a battery monomer, which comprises a shell, an electrode assembly, an electrode terminal and an adapter. The electrode terminal is arranged on a first wall of the shell, and the electrode assembly is arranged in the shell. The adapter comprises a first part and a second part connected to each other, the first part is connected with the electrode terminal to form a first welding part, and the second part is connected with a tab of the electrode assembly to form a second welding part. In the same 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, and 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. The adapter has high flow capacity, and the battery monomer has high charge-discharge cycle performance.

[0092] In such a battery monomer, in the projection 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 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, the flow path of the current in the adapter is short, the adapter has high flow capacity, and the battery monomer has high charge-discharge cycle performance.

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

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

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

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

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

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

[0099] Please refer to FIG. 2, which is a structural exploded schematic diagram of a battery provided by some embodiments of the present application. The battery 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first sub-box body 11 and a second sub-box body 12, and the first sub-box body 11 and the second sub-box body 12 are mutually covered, and the first sub-box body 11 and the second sub-box body 12 jointly define a containing space for containing the battery monomer 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-shaped structure, which is covered on 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 the containing space; the first sub-box body 11 and the second sub-box body 12 can also be hollow structures with one side open, and the open side of the first sub-box body 11 is covered on the open side of the second sub-box body 12.

[0100] In the battery 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery 100 can also be in the form of multiple battery cells 20 connected in series, in parallel, or in a mixed connection to form a battery module, and multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the case 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

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

[0102] Referring to FIG. 3, FIG. 3 is a structural exploded view of a battery cell according to some embodiments of the present application. As shown in FIG. 3, the battery cell 20 includes a housing 21, an electrode assembly 22, and an electrode terminal 23. The housing 21 includes a case 211 and an end cap 212, the case 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.

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

[0104] The end cover 212 refers to a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the housing 211 to fit the housing 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is less likely to deform when subjected to extrusion collision, so that the battery cell 20 can have higher structural strength and reliability can also be improved. The end cover 212 can be provided with functional components such as electrode terminals 23. The electrode terminals can be used to electrically connect with the electrode assembly 22 for output or input of the electrical energy of the battery cell 20. The material of the end cover 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 cover 212, which can be used to isolate the electrical connection components in the housing 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

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

[0106] Please refer to FIG. 3, and further refer to FIG. 4, which is a partial structural schematic diagram of a battery cell provided by some embodiments of the present application, and FIG. 4 shows the schematic diagram of the connection of the tabs with the adapter and the connection of the adapter with the electrode terminals after the assembly of the battery cell. In FIG. 4, the number of electrode assemblies is two, and the first wall is located between the two electrode assemblies along the first direction.

[0107] The battery cell 20 provided by the embodiments of the present application includes a shell 21, an electrode assembly 22, an electrode terminal 23, and a adapter 24. The shell 21 includes a first wall 213; the electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 has a tab 221; the electrode terminal 23 is arranged on the first wall 213; the adapter 24 includes a first part 241 and a second part 242 connected to each other, the first part 241 is welded with the electrode terminal 23 to form a first welding part 251, and the second part 242 is welded with the tab 221 to form a second welding part 252; in the same projection plane perpendicular to the thickness direction Z of the first wall, the orthogonal projection of the first welding part 251 is a first projection 253, and the orthogonal projection of the second welding part 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.

[0108] The shell 21 can include a shell body 211 having an opening and an end cover 212 covering the opening. The first wall 213 can be a wall part of the shell body 211, or the first wall 213 can be the end cover 212.

[0109] In some embodiments, the first wall 213 is the end cover 212.

[0110] In some embodiments, the electrode terminal 23 can be arranged in an insulating manner on the first wall 213, for example, an insulating structure can be arranged between the electrode terminal 23 and the first wall 213.

[0111] The first direction X can be parallel to the width direction (or the thickness direction) of the battery cell 20.

[0112] In some embodiments, the electrode terminal 23 can include a positive electrode terminal 23a and a negative electrode terminal 23b, and the positive electrode terminal 23a and the negative electrode terminal 23b are arranged in a spaced manner in a second direction Y, and the second direction Y can be parallel to the length direction of the battery cell 20. The tab 221 includes a positive tab 221a and a negative tab 221b, and 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.

[0113] For ease of description, the embodiments of the present application do not limit the polarity of the adapter 24, the tab 221, and the electrode terminal 23, and the polarity of the adapter 24, the tab 221, and the electrode terminal 23 is 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.

[0114] In some embodiments, the first wall 213 is provided with a first through hole, and the electrode terminal 23 and the adapter 24 are connected through the first through hole, for example, a part of the electrode terminal 23 extends into the first through hole to be connected with the adapter 24.

[0115] In some embodiments, the electrode assembly 22 can be flat, and the electrode assembly 22 can be in a roll structure, in which the positive electrode tab, the negative electrode tab and the separator film are rolled and flattened to form the flat electrode assembly 22, or the electrode assembly 22 can be in a stack structure.

[0116] In some embodiments, the battery cell 20 can be a square cell, and the first wall 213 can be a cuboid.

[0117] The adapter 24 can be an electrically conductive member, and the adapter 24 can be made of copper, aluminum or the like.

[0118] The first part 241 is a part of the adapter 24 for connecting with the electrode terminal 23, and the second part 242 is a part of the adapter 24 for connecting with the tab 221. The first part 241 and the second part 242 can be integrally formed.

[0119] In the projection along the thickness direction Z of the first wall, the first projection 253 is a front projection of the first welding part 251, and the second projection 254 is a front projection of the second welding part 252. The first projection 253 and the second projection 254 at least partially overlap along the first direction X 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.

[0120] In the same projection plane perpendicular to the thickness direction Z of the first wall, the front projection of the first part 241 and the front projection of the second part 242 at least partially overlap along the first direction X, so that the first projection 253 and the second projection 254 at least partially overlap.

[0121] In some embodiments, the adapter 24 can be a flat plate, and the first part 241 and the second part 242 are coplanar.

[0122] In some embodiments, the adapter 24 can be a bent structure, and the first part 241 and the second part 242 are on different planes.

[0123] In some embodiments, the thickness direction of the adapter 24 is parallel to the thickness direction Z of the first wall.

[0124] According to the battery cell 20 provided by the embodiments of the present application, in the same projection plane perpendicular to the thickness direction Z of the first wall, the first projection 253 and the second projection 254 at least partially overlap along the first direction X, 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, the flow path of the current in the adapter 24 is shorter, and the overcurrent capacity of the adapter 24 can be improved, thereby improving the charge-discharge cycle performance of the battery cell 20.

[0125] Please refer to FIG. 5, which 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, the first projection 253 and the second projection 254 have an overlapping area along the first direction X, and the orthographic projection of the part of the adapter 24 in the overlapping area is continuously distributed.

[0126] The overlapping area refers to the area where the first projection 253 and the second projection 254 overlap along the first direction X.

[0127] The part of the adapter 24 in the overlapping area can be the transition portion 244 connecting the first portion 241 and the second portion 242 of the adapter 24, and 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 the 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 “the cross section of the adapter 24 is continuous in the first direction X” mentioned herein refers to that the cross section of the adapter 24 is uninterrupted in the first direction X, and the cross section of the adapter 24 can be in a semi-filled state, for example, the cross section of the adapter 24 has a groove, a notch, etc.; or the cross section of the adapter 24 can be in a fully filled state.

[0128] When the current flows between the first welding portion 251 and the second welding portion 252, the current flows in the 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 shorter flow path, thereby facilitating the improvement of the overcurrent capacity of the adapter 24.

[0129] Please refer to FIG. 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.

[0130] The first wall 213 can be 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.

[0131] The second portion 242 is distributed along the first direction X with the first portion 241.

[0132] In the above scheme, the second portion 242 is located at one side of the first portion 241 along the width direction of the first wall, and the orthographic projection of the first portion 241 and the orthographic projection of the second portion 242 at least partially overlap on the same projection plane perpendicular to the thickness direction Z of the first wall, the first portion 241 and the second portion 242 occupy a smaller space in the length direction of the first wall, and the size of the tab 221 in the length direction of the first wall 213 can be larger, so as to improve the flow capacity between the tab 221 and the adapter 24.

[0133] According to some embodiments of the present application, the size of the second portion 242 along the second direction Y 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, and the second direction Y is parallel to the length direction of the first wall 213.

[0134] For example, the size of the second portion 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 a range between any two of them.

[0135] In some embodiments, the size of the second welding portion 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 portion 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 a range between any two of them.

[0136] In the above scheme, the size of the second portion 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 larger, so as to improve the flow capacity between the tab 221 and the adapter 24, on the other hand, the second portion 242 occupies a smaller space in the second direction Y, reducing the interference between the adapter 24 and other components (such as insulation, pressure relief mechanism, etc.).

[0137] Please refer to FIG. 6 to FIG. 8, FIG. 6 is an assembly schematic view of the adapter and the first wall according to some embodiments of the present application, FIG. 7 is an assembly schematic view of the adapter and the first wall according to some other embodiments of the present application, and FIG. 8 is an assembly schematic view of the adapter and the first wall according to 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 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 shown in FIG. 6, in the direction from the second edge 213b to the first edge 213a, the first end 242a is beyond the third end 241a; and / or as shown in FIG. 7, in the direction from the first edge 213a to the second edge 213b, the second end 242b is 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, and the second direction Y is parallel to the length direction of the first wall 213.

[0138] 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 can be arranged in parallel.

[0139] 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 arranged corresponding to the first edge 213a, the first end 242a is closer to the first edge 213a than the second end 242b, and the second end 242b is arranged corresponding to the second edge 213b, the second end 242b is closer to the second edge 213b than the first end 242a.

[0140] 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 arranged corresponding to the first edge 213a, the third end 241a is closer to the first edge 213a than the fourth end 241b, and the fourth end 241b is arranged corresponding to the second edge 213b, the fourth end 241b is closer to the second edge 213b than the third end 241a.

[0141] As shown in FIG. 6, when “in the direction from the second edge 213b to the first edge 213a, the first end 242a is beyond the third end 241a”, in the direction from the first edge 213a to the second edge 213b, the second end 242b can be flush with the fourth end 241b, so that the second part 242 has a larger size in the second direction Y.

[0142] As shown in FIG. 7, when the second end 242b is beyond the fourth end 241b in the direction along the first edge 213a to the second edge 213b, the first end 242a can be flush with the third end 241a in the direction along the second edge 213b to the first edge 213a, so that the second part 242 has a larger dimension in the second direction Y.

[0143] As shown in FIG. 8, when the first end 242a is beyond the third end 241a in the direction along the second edge 213b to the first edge 213a, and the second end 242b is beyond the fourth end 241b in the direction along the first edge 213a to the second edge 213b, the dimension of the second part 242 in the second direction Y is larger than that of the first part 241 in the second direction Y, and the tab 221 can have a larger dimension in the second direction Y, so that the tab 221 has a larger connection area with the adapter 24, and the overcurrent capacity of the tab 221 and the adapter 24 is improved.

[0144] In the above scheme, the second part 242 has a larger dimension in the second direction Y, the space inside the battery monomer 20 in the second direction Y is reasonably utilized, the dimension of the tab 221 in the second direction Y can be larger, and when viewed in the first direction X, the second projection 254 has a larger overlapping area with the first projection 253, for example, the second projection 254 can cover the whole first projection 253 when viewed in the first direction X, so that the flow path of the current in the adapter 24 is shortened, and the overcurrent capacity of the adapter 24 is improved. At the same time, the first part 241 has a smaller dimension in the second direction Y, so as to reduce the risk of interference between the electrode terminal 23 and other components.

[0145] Please refer to FIG. 9, which is an assembly diagram of the adapter and the first wall according to some 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 arranged opposite 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, the first end 242a and the third end 241a are flush in the direction along the second edge 213b to the first edge 213a, and the second end 242b and the fourth end 241b are flush in the direction along the first edge 213a to the second edge 213b; the second direction Y, the first direction X and the thickness direction Z of the first wall are perpendicular to each other, and the second direction Y is parallel to the length direction of the first wall 213.

[0146] 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 can be arranged in parallel.

[0147] The first end 242a and the second end 242b are two ends of the second part 242 arranged opposite in the second direction Y, the first end 242a is arranged corresponding to the first edge 213a, and the first end 242a is closer to the first edge 213a than the second end 242b; the second end 242b is arranged corresponding to the second edge 213b, and the second end 242b is closer to the second edge 213b than the first end 242a.

[0148] The third end 241a and the fourth end 241b are two ends of the first part 241 arranged opposite in the second direction Y, the third end 241a is arranged corresponding to the first edge 213a, and the third end 241a is closer to the first edge 213a than the fourth end 241b; the fourth end 241b is arranged corresponding to the second edge 213b, and the fourth end 241b is closer to the second edge 213b than the third end 241a.

[0149] The "first end 242a and the third end 241a are flush in the direction along the second edge 213b pointing to the first edge 213a, and the second end 242b and the fourth end 241b are flush in the direction along the first edge 213a pointing to the second edge 213b" means that, 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 completely overlap in the first direction X.

[0150] In the above scheme, the first end 242a and the third end 241a are flush, and the second end 242b and the fourth end 241b are flush, which facilitates processing and manufacturing. At the same time, the second projection 254 and the first projection 253 can have a larger overlapping area in the first direction X, so as to shorten the flow path of the current in the adapter 24 and improve the current carrying capacity of the adapter 24.

[0151] Please refer to FIG. 10, which is a schematic diagram of the first projection and the second projection according to some 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 arranged oppositely 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, 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; in the direction from the second edge 213b to the first edge 213a, the third edge 253a does not exceed the fifth edge 254a, and in the direction from the first edge 213a to the second edge 213b, the fourth edge 253b does not exceed the sixth edge 254b; or, in the direction from the second edge 213b to the first edge 213a, the fifth edge 254a does not exceed the third edge 253a, and in the direction from the first edge 213a to the second edge 213b, the sixth edge 254b does not exceed the fourth edge 253b.

[0152] 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 can be arranged in parallel.

[0153] 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 two ends of the first projection 253 in the second direction Y. In some embodiments, the third edge 253a and the fourth edge 253b can be arranged in parallel.

[0154] 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 two ends of the second projection 254 in the second direction Y. In some embodiments, the fifth edge 254a and the sixth edge 254b can be arranged in parallel.

[0155] “In the direction from the second edge 213b to the first edge 213a, the third edge 253a does not exceed the fifth edge 254a” means that in 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 exceeds the third edge 253a.

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

[0157] The "the fifth edge 254a does not protrude beyond the third edge 253a in the direction pointing from the second edge 213b to the first edge 213a" means that the fifth edge 254a is flush with the third edge 253a in the direction pointing from the second edge 213b to the first edge 213a, or the third edge 253a protrudes beyond the fifth edge 254a.

[0158] The "the sixth edge 254b does not protrude beyond the fourth edge 253b in the direction pointing from the first edge 213a to the second edge 213b" means that the sixth edge 254b is flush with the fourth edge 253b in the direction pointing from the first edge 213a to the second edge 213b, or the fourth edge 253b protrudes beyond the sixth edge 254b.

[0159] In the above solution, when "the third edge 253a does not protrude beyond the fifth edge 254a in the direction pointing from the second edge 213b to the first edge 213a, and the fourth edge 253b does not protrude beyond the sixth edge 254b in the direction pointing from the first edge 213a to the second edge 213b", the size of the second projection 254 in the second direction Y is greater than or equal to the size of the first projection 253 in the second direction Y, and the second projection 254 can cover the whole first projection 253 when viewed in the first direction X, so as to shorten the flow path of the current in the adapter 24 and improve the current carrying capacity of the adapter 24. When "the fifth edge 254a does not protrude beyond the third edge 253a in the direction pointing from the second edge 213b to the first edge 213a, and the sixth edge 254b does not protrude beyond the fourth edge 253b in the direction pointing from the first edge 213a to the second edge 213b", the size of the first projection 253 in the second direction Y is greater than or equal to the size of the second projection 254 in the second direction Y, and the first projection 253 can cover the whole second projection 254 when viewed in the first direction X, so as to shorten the flow path of the current in the adapter 24 and improve the current carrying capacity of the adapter 24.

[0160] Please refer to FIG. 10, according to some embodiments of the present application, the first projection 253 and the second projection 254 completely overlap in the first direction X.

[0161] In the above solution, the first projection 253 and the second projection 254 completely overlap, so as to shorten the flow path of the current when flowing between the first welding part 251 and the second welding part 252, thereby improving the current carrying capacity of the adapter 24.

[0162] Referring to FIG. 10, according to some embodiments of the present application, the number of the second parts 242 is two, and the two second parts 242 are respectively connected to the two ends of the first part 241 along the first direction X; on the same projection plane perpendicular to the thickness direction Z of the first wall, the first projection 253 is located between the two second projections 254 along the first direction X.

[0163] The first part 241 is located between the two second parts 242 along the first direction X, and 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 along 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, and 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, and the tabs 221 of half of the even number of electrode assemblies 22 are connected to one second part 242, and the tabs 221 of the other half of the even number of electrode assemblies 22 are connected to the other second part 242.

[0164] The two second projections 254 can be arranged in parallel with each other, and the two second projections 254 completely overlap along the first direction X.

[0165] In some embodiments, the first projection 253 is arranged between the two second projections 254 along the first direction X, and the second projection 254 can completely overlap with the first projection 253.

[0166] In the above scheme, the two second parts 242 are located at the two ends of the first part 241 along the first direction X, so as to be connected to the tabs 221 of the electrode assemblies 22 at different positions along the first direction X and reasonably utilize the space inside the battery monomer 20 along the first direction X.

[0167] Referring to FIGS. 3 and 4, according to some embodiments of the present application, the number of the electrode assemblies 22 is two, and the two electrode assemblies 22 are arranged in a stack along the first direction X, and the tabs 221 of the two electrode assemblies 22 are respectively connected to the two second parts 242.

[0168] The two electrode assemblies 22 are of the same structure, and the tabs 221 of the two electrode assemblies 22 are arranged in one-to-one correspondence with the two second parts 242, so as to be respectively connected to the two second parts 242.

[0169] In the above scheme, the two electrode assemblies 22 are stacked in the shell 21, the battery monomer 20 can be provided with more active substances, the energy density of the battery monomer 20 is improved, and the tabs 221 of the two electrode assemblies 22 are respectively connected to the two second parts 242, so that the connection of the two electrode assemblies 22 and the adapter 24 is facilitated.

[0170] Please refer to FIG. 3, according to some embodiments of the present application, the shell 21 includes a housing 211 and an end cover 212, the housing 211 has an opening, the end cover 212 covers the opening, and the end cover 212 is a first wall 213; the number of the electrode assembly 22 is one, the size of the housing 211 in the first direction X is greater than or equal to 20mm and less than or equal to 40mm; or, the number of the electrode assembly 22 is two, the two electrode assemblies 22 are stacked along the first direction X, and the size of the housing 211 in the first direction X is greater than or equal to 35mm and less than or equal to 90mm; wherein, the first direction X is parallel to the width direction of the first wall 213.

[0171] In some embodiments, when the number of the electrode assembly 22 is one, the size of the housing 211 in the first direction X can be any one or any range between any two of 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm.

[0172] In some embodiments, when the number of the electrode assembly 22 is two, the size of the housing 211 in the first direction X can be any one or any range between any two of 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm.

[0173] In the above scheme, when the number of the electrode assembly 22 is one, the size of the housing 211 in the first direction X satisfies the above relationship (greater than or equal to 20mm and less than or equal to 40mm), the inside of the housing 211 has a larger space in the first direction X, so as to facilitate the arrangement of the tabs 221 and the electrode terminals 23 in the first direction X, and facilitate the processing and manufacturing of the electrode assembly 22. When the number of the electrode assembly 22 is two, the size of the housing 211 in the first direction X satisfies the above relationship (greater than or equal to 35mm and less than or equal to 90mm), the inside of the housing 211 has a larger space in the first direction X, so as to facilitate the arrangement of the tabs 221 and the electrode terminals 23 in the first direction X, and the housing 211 can be provided with more active substances, so as to facilitate the improvement of the energy density of the battery monomer 20.

[0174] Referring to FIG. 3, according to some embodiments of the present application, the shell 21 comprises a housing 211 having an opening and an end cover 212 covering the opening, the end cover 212 being the first wall 213; the housing 211 has a dimension in the second direction Y 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, and the second direction Y is parallel to the length direction of the first wall 213.

[0175] In some embodiments, the second direction Y can be parallel to the length direction of the battery monomer 20, and the dimension of the housing 211 in the second direction Y can be the length of the battery monomer 20.

[0176] The dimension of the housing 211 in the second direction Y can 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 a range between any two of them.

[0177] In the above scheme, the electrode terminal 23 and the tab 221 occupy a small space in the second direction Y, the dimension of the housing 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 end cover 212 and the housing 211 have high connection reliability.

[0178] Referring to FIG. 3, and further referring to FIG. 11 and FIG. 12, FIG. 11 is a cross-sectional view of part of the structure of the battery monomer provided by some embodiments of the present application, and FIG. 12 is a partial enlarged view of A in FIG. 11. According to some embodiments of the present application, the battery monomer 20 further comprises a first insulating member 26, at least part of the first insulating member 26 is arranged between the first wall 213 and the adapter 24 along the thickness direction Z of the first wall; the first wall 213 is provided with a first through hole 2131, part of the electrode terminal 23 is arranged in the first through hole 2131, the first insulating member 26 has a first surface 261 facing away from the first wall 213, and the electrode terminal 23 protrudes from the first surface 261 in the direction of the electrode assembly 22 along the first wall 213; the adapter 24 further comprises a bending part 243, the second part 242 is connected to the first part 241 through the bending part 243, and the first part 241 protrudes from the second part 242 in the direction away from the first wall 213 along the thickness direction Z of the first wall.

[0179] The first through hole 2131 penetrates 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 inside of the battery monomer 20 and connect with the tab 221.

[0180] In some embodiments, the entirety of the first insulating member 26 can be disposed between the first wall 213 and the adapter 24; alternatively, a portion of the first insulating member 26 can be disposed between the first wall 213 and the adapter 24, and another portion of the first insulating member 26 can be disposed within the first through-hole 2131.

[0181] A portion of the electrode terminal 23 is disposed within the first through-hole 2131, one end of the electrode terminal 23 is located at a side of the first wall 213 facing away from the interior of the battery monomer 20, and the other end of the electrode terminal 23 is located at a side of the first wall 213 facing the interior of the battery monomer 20.

[0182] The first surface 261 is a surface of the first insulating member 26 facing away from the first wall 213.

[0183] The electrode terminal 23 has a first end surface 231 located within the interior of the battery monomer 20, the first end surface 231 being an end surface of the electrode terminal 23 closest to the interior of the battery monomer 20. In a direction of the first wall 213 pointing to the electrode assembly 22, the first end surface 231 protrudes from the first surface 261, and the first end surface 231 is further away from the first wall 213 than the first surface 261.

[0184] In some embodiments, the adapter 24 is an integrally formed bent structure, for example, the adapter 24 can be formed by stamping a plate. The bent portion 243 is bent relative to the first portion 241, the second portion 242 is bent relative to the bent portion 243, and the first portion 241 can 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.

[0185] In the above scheme, a portion 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 monomer 20, the first portion 241 protrudes from the second portion 242 in a 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, thereby utilizing the space within the interior of the battery monomer 20 in the thickness direction Z of the first wall to facilitate reducing the overall height of the battery monomer 20.

[0186] Referring to FIG. 12, according to some embodiments of the present application, in the thickness direction Z of the first wall, the tab 221 is located at a side of the second portion 242 facing away from the first insulating member 26.

[0187] The second portion 242 is closer to the first wall 213 than the first portion 241, the tab 221 is located at a side of the second portion 242 facing away from the first insulating member 26, and a portion of the tab 221 overlaps the bent portion 243 in the first direction X.

[0188] The tab 221 is located on the side of the second part 242 facing away from the first insulating member 26. During assembly of the battery cell 20, the tab 221 and the second part 242 can be welded in a direction in which the inner surface of the first wall 213 points to the outer surface of the first wall 213, and the first part 241 and the electrode terminal 23 can be welded.

[0189] In the above scheme, the tab 221 is located on the side of the second part 242 facing away from the first insulating member 26, which facilitates assembly and reduces the risk of interference between the tab 221 and the first insulating member 26.

[0190] Please refer to FIG. 12. According to some embodiments of the present application, the distance between the second part 242 and the first insulating member 26 along the thickness direction Z of the first wall is greater than or equal to 0.1 mm and less than or equal to the size of the second part 242 along the thickness direction Z of the first wall.

[0191] 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 size of the second part 242 along the thickness direction Z of the first wall can be the thickness of the second part 242.

[0192] For ease of description, the size indicated by the letter H1 is the distance between the second part 242 and the first insulating member 26 along the thickness direction Z of the first wall, and the size indicated by the letter H2 is the size of the second part 242 along the thickness direction Z of the first wall, satisfying 0.1 mm≤H1≤H2.

[0193] For example, H1 can be any value between 0.1 mm and H2.

[0194] Along the thickness direction Z of the first wall, the second part 242 and the first insulating member 26 can have a gap to facilitate assembly of the adapter 24 and the first insulating member 26.

[0195] In the above scheme, the distance between the second part 242 and the first insulating member 26 satisfies the above relationship. On the one hand, the assembly space is reserved to accommodate the processing error and reduce the risk of interference between the tab and the first insulating member. On the other hand, the space waste in the thickness direction of the first wall is reduced.

[0196] Please refer to FIG. 13, which is a partial enlarged view of A in FIG. 4. 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.

[0197] 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.

[0198] For the convenience 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.

[0199] Optionally, 0 < L ≤ 10 mm.

[0200] 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 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 a range between any two of them.

[0201] In the above scheme, 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 larger overlapping area, the flow path of the current between the first welding portion 251 and the second welding portion 252 is shorter, which is convenient for improving the overcurrent capacity of the adapter 24.

[0202] According to some embodiments of the present application, the embodiments of the present application further provide a battery 100 comprising the battery cell 20 provided in any of the above embodiments.

[0203] According to some embodiments of the present application, the embodiments of the present application further provide a consumer, comprising the battery cell 20 or the battery 100 provided in any of the above embodiments, and the battery cell 20 or the battery 100 is used to provide electric energy.

[0204] The consumer can be any of the above application devices or systems of the battery cell 20 or the battery.

[0205] According to some embodiments of the present application, referring to FIGS. 3-13, the embodiments of the present application provide a battery cell 20, which is a square cell. The battery cell 20 comprises an outer shell 21, an electrode assembly 22, an electrode terminal 23, an adapter 24, and a first insulating member 26.

[0206] The outer shell 21 has a shell body 211 and an end cover 212, the shell body 211 has an opening, and the end cover 212 covers the opening. The outer shell 21 comprises a first wall 213, the electrode terminal 23 is arranged on the first wall 213, and the first wall 213 is the end cover 212.

[0207] The electrode assembly 22 has a tab 221, 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.

[0208] In the same projection plane perpendicular to the thickness direction Z of the first wall, the front projection of the first welding portion 251 is a first projection 253, and the front projection of the second welding portion 252 is a second projection 254, and along the first direction X, the first projection 253 and the second projection 254 at least partially overlap.

[0209] The number of electrode terminals 23 is two, and the two electrode terminals 23 include a positive electrode terminal 23a and a negative electrode terminal 23b, and the positive electrode terminal 23a and the negative electrode terminal 23b are arranged in the second direction Y; the adapter 24 includes a positive adapter 24a and a negative adapter 24b, and the tab 221 includes a positive tab 221a and a negative tab 221b, and 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.

[0210] Along the second direction Y, one end of the second portion 242 of the positive adapter 24a close to the negative electrode terminal 23b protrudes beyond the first portion 241 of the positive adapter 24a, and one end of the second portion 242 of the negative adapter 24b close to the positive electrode terminal 23a protrudes beyond the first portion 241 of the negative adapter 24b.

[0211] The first wall 213 is provided with a first through hole 2131, and a part of the electrode terminal 23 is arranged in the first through hole 2131, and the first insulating member 26 has a first surface 261 facing away from the first wall 213, and along the direction of the electrode assembly 22 pointing to the first wall 213, the electrode terminal 23 protrudes from the first surface 261. The adapter 24 is a bent structure, and the adapter 24 further includes a bending portion 243, and the second portion 242 is connected to the first portion 241 through the bending portion 243, and along the thickness direction Z of the first wall, the first portion 241 protrudes from the second portion 242 in the direction away from the first wall 213, and at least a part of the first insulating member 26 is arranged 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 portion 242 away from the first insulating member 26.

[0212] According to the battery cell 20 provided by the embodiment of the application, the first projection 253 and the second projection 254 at least partially overlap along the first direction X on the same projection plane perpendicular to the thickness direction Z of the first wall, 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, the flow path of the current in the adapter 24 is shorter, and the overcurrent capacity of the adapter 24 can be improved, thereby improving the charge-discharge cycle performance of the battery cell 20. The adapter 24 is of an integrated structure, and is convenient for processing and manufacturing. One end of the electrode terminal 23 penetrates through the first wall 213 and extends into the inside of the shell 21, thereby conveniently reducing the space occupation of the battery cell 20 in the thickness direction Z of the first wall.

[0213] Although the application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope of the application, and equivalent components can be substituted for the components therein. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery, comprising: a housing comprising a first wall; an electrode assembly disposed in the housing, the electrode assembly having a tab; an electrode terminal disposed on the first wall; an adapter comprising a first portion and a second portion connected to each other, the first portion being welded to the electrode terminal to form a first welded portion, and the second portion being welded to the tab to form a second welded portion; wherein, in the same projection plane perpendicular to the thickness direction of the first wall, the first welded portion has a first projection, and the second welded portion has a second projection; in a first direction, the first projection and the second projection at least partially overlap, the first direction being perpendicular to the thickness direction of the first wall.

2. The battery cell of claim 1, wherein, In 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 projection of the part of the adapter in the overlapping area is continuously distributed.

3. The battery cell according to claim 1 or 2, characterized in that, 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.

4. The battery cell of any one of claims 1-3, wherein, In a 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 of any one of claims 1-4, wherein, The first wall has a first edge and a second edge oppositely arranged 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; In the direction of the first edge pointing to the second edge, the first end exceeds the third end; and / or, In the direction of the first edge pointing 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 of any one of claims 1-4, wherein, The first wall has a first edge and a second edge oppositely arranged 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; In the direction of the first edge pointing to the second edge, the first end and the third end are flush, and in the direction of the first edge pointing 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, and the second direction is parallel to the length direction of the first wall.

7. The battery cell of any one of claims 1-6, wherein, The first wall has a first edge and a second edge oppositely arranged 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. 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 in the same projection plane perpendicular to the thickness direction of the first wall; The third edge does not exceed the fifth edge in the direction of the first edge to the second edge, and the fourth edge does not exceed the sixth edge in the direction of the second edge to the first edge; Or, The fifth edge does not exceed the third edge in the direction of the first edge to the second edge, and the sixth edge does not exceed the fourth edge in the direction of the second edge to the first edge. The first projection and the second projection completely overlap in the first direction.

8. The battery cell of any one of claims 1-7, wherein, The number of the second parts is two, and the two second parts are respectively connected to the two ends of the first part in the first direction; 9. The battery cell of any one of claims 1-8, wherein, The first projection is located between the two second projections in the first direction in the same projection plane perpendicular to the thickness direction of the first wall. The number of the electrode assemblies is two, and the two electrode assemblies are stacked in the first direction, and the lugs of the two electrode assemblies are respectively connected to the two second parts.

10. The battery cell of claim 9, wherein, The shell comprises a shell body and an end cover, the shell body has an opening, and the end cover covers the opening, and the end cover is the first wall; 11. The battery cell of any one of claims 1-9, wherein, The number of the electrode assemblies is one, and the size of the shell body 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, and the two electrode assemblies are stacked in the first direction, and the size of the shell body 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. The shell comprises a shell body and an end cover, the shell body has an opening, and the end cover covers the opening, and the end cover is the first wall; 12. The battery cell of any one of claims 1-11, wherein, The size of the shell 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, and the second direction is parallel to the length direction of the first wall. The battery monomer further comprises:

13. The battery cell of any one of claims 1-12, wherein, A first insulating member, at least a part of the first insulating member is arranged between the first wall and the adapter in the thickness direction of the first wall; The first wall is provided with a first through hole, and a part of the electrode terminal is arranged 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 in the direction of the electrode assembly away from the first wall; The adapter further comprises a bending part, the second part is connected to the first part through the bending part, and the first part protrudes from the second part in the direction away from the first wall in the thickness direction of the first wall. The lug is located on the side of the second part away from the first insulating member in the thickness direction of the first wall.

14. The battery cell of claim 13, wherein, ​ 15. The battery cell of claim 14, wherein, The distance between the second portion and the first insulating member along the thickness direction of the first wall is greater than or equal to 0.1 mm and less than or equal to the size of the second portion along the thickness direction of the first wall.

16. The battery cell of any one of claims 1-15, wherein, The distance between the center of the first projection and the center of the second projection along the second direction 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.

17. A battery, characterized by A battery cell as claimed in any of claims 1 to 16.

18. An electrical device, comprising: A battery cell as claimed in any of claims 1 to 16 or a battery as claimed in claim 17 for providing electrical energy.

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