Battery cell, battery and electric device

Abstract

A battery cell, a battery and an electric device, which belong to the technical field of batteries. The battery cell comprises a casing, an electrode terminal and a sealing member, wherein the casing comprises a first wall, and a recess recessed in the direction of the thickness of the first wall is provided on an outer surface of the first wall. A part of the electrode terminal is accommodated in the recess. An outer peripheral face of the electrode terminal comprises a first pressing face; and in the radial direction of the electrode terminal, at least a part of the sealing element is arranged between the first pressing face and an inner peripheral face of the recess, and the first pressing face and an inner circumferential face of the recess jointly clamp the sealing member. The battery cell has high reliability.

Description

Battery cells, batteries and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 202420687286.4, filed on April 3, 2024, entitled “Battery Cell, Battery and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a coating device, a coating method, and a battery production line. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] How to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Summary of the Invention

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery cell.

[0006] In a first aspect, the present application provides a battery cell, comprising a housing, an electrode terminal, and a seal. The housing comprises a first wall, the outer surface of the first wall being provided with a recessed portion recessed along the thickness direction of the first wall. A portion of the electrode terminal is accommodated within the recessed portion. The outer circumferential surface of the electrode terminal comprises a first compression surface, and along a radial direction of the electrode terminal, at least a portion of the seal is disposed between the first compression surface and the inner circumferential surface of the recessed portion, the first compression surface and the inner circumferential surface of the recessed portion jointly clamping the seal.

[0007] In the technical solution of the embodiment of the present application, the seal seals the gap between the first pressing surface and the inner circumferential surface of the recess along the radial direction of the electrode terminal, so that the reaction force generated by the compressed seal acting on the electrode terminal along the thickness direction of the first wall is relatively small, thereby making the risk of separation of the components connected to the electrode terminal from the electrode terminal relatively low, which is beneficial to making the battery cell have higher conductive stability, and further beneficial to improving the reliability of the battery cell.

[0008] In one or more embodiments of the first aspect, an angle between an inner circumferential surface of the recess and a bottom surface of the recess is a first obtuse angle.

[0009] In the above solution, the angle between the inner circumferential surface of the recess and the bottom surface of the recess is a first obtuse angle, which can reduce the force on the electrode terminal in the thickness direction of the first wall while reducing the difficulty of assembling the seal.

[0010] In one or more embodiments of the first aspect, the electrode terminal has a second pressing surface, and along the thickness direction of the first wall, the second pressing surface and the bottom surface of the recess are arranged opposite to each other, the first pressing surface is connected to the second pressing surface, and the angle between the first pressing surface and the second pressing surface is a second obtuse angle.

[0011] In the above solution, the included angle between the first pressing surface and the second pressing surface is the second obtuse angle, which can further reduce the difficulty of assembling the first sealing component.

[0012] In one or more embodiments of the first aspect, the battery cell further includes a first insulating member, and along a thickness direction of the first wall, at least a portion of the first insulating member is located between the second pressing surface and the bottom surface of the recess.

[0013] In the above solution, the provision of the first insulating member can reduce the direction of short circuit between the electrode terminal and the first wall, which is beneficial to improving the insulation performance of the electrode terminal and the first wall, and further beneficial to improving the reliability of the battery cell.

[0014] In one or more embodiments of the first aspect, a first through-hole is provided on the bottom surface of the recess, and at least a portion of the electrode terminal is disposed within the first through-hole. The first insulating member includes a first insulating member body and a first extension. Along the thickness direction of the first wall, the first insulating member body is disposed between the outer surface of the first wall and the second pressing surface, and at least a portion of the first extension is located within the first through-hole.

[0015] In the above solution, at least a portion of the first extension portion is located in the first through hole, which can reduce the risk of short circuit between the electrode terminal and the hole wall of the first through hole, thereby facilitating improved reliability of the battery cell.

[0016] In one or more embodiments of the first aspect, a first gap is defined between the first extension portion and the electrode terminal along a radial direction of the electrode terminal.

[0017] In the above solution, the provision of the first gap can provide a certain assembly space for the electrode terminal, thereby reducing the risk of insulation failure of the first insulating member due to damage to the first insulating member during the assembly process.

[0018] In one or more embodiments of the first aspect, the battery cell further includes an adapter and an electrode assembly, the electrode assembly being disposed within the housing, and the adapter electrically connecting the electrode terminals to the electrode assembly. The battery cell further includes a second insulating member, at least a portion of which is disposed between the inner surface of the first wall and the adapter along the thickness direction of the first wall.

[0019] In the above solution, the adapter electrically connects the electrode terminal and the electrode assembly, employing a radial seal to seal the first compression surface and the inner circumference of the recess, thereby reducing the risk of separation between the electrode terminal and the adapter. At least a portion of the second insulating member is disposed between the inner surface of the first wall and the adapter, reducing the risk of a short circuit between the adapter and the inner surface of the first wall, thereby improving the reliability of the battery cell.

[0020] In one or more embodiments of the first aspect, the second insulating member includes a second insulating member body and a second extension portion. Along the thickness direction of the first wall, the second insulating member body is arranged between the inner surface of the first wall and the adapter. In the radial direction of the electrode terminal, at least a portion of the second extension portion is located in the first through hole.

[0021] In the above solution, at least a portion of the second extension portion is located in the first through hole, which can reduce the risk of short circuit between the electrode terminal and / or the adapter and the hole wall of the first through hole, thereby facilitating improved reliability of the battery cell.

[0022] In one or more embodiments of the first aspect, a second gap is provided between the second extending portion and the electrode terminal along a radial direction of the electrode terminal.

[0023] In the above solution, the provision of the second gap can provide a certain assembly space for the electrode terminal and / or the adapter, thereby reducing the risk of insulation failure of the second insulating member due to damage to the second insulating member during assembly.

[0024] In one or more embodiments of the first aspect, along a radial direction of the electrode terminal, at least a portion of the second extension portion is located between the first extension portion and the electrode terminal.

[0025] In the above solution, at least a portion of the second extension is located between the first extension and the electrode terminal. This, on the one hand, constrains the second insulating member and the first insulating member, minimizing the risk of both members shaking and enhancing structural stability. Furthermore, this further reduces the risk of the electrode terminal and / or adapter shorting to the wall of the first through-hole.

[0026] In one or more embodiments of the first aspect, the battery cell further includes a connector and a third insulating member, wherein the connector protrudes from the outer surface of the first wall and surrounds the electrode terminal. The third insulating member connects the electrode terminal and the connector to separate the connector and the electrode terminal.

[0027] In the above solution, the electrode terminal is clamped and secured by the connector and the first wall. The electrode terminal is restrained at both ends of the first wall's thickness. This radial sealing significantly reduces the risk of separation between the electrode terminal and the connected component. This also reduces the risk of insulation failure of the third insulating member due to excessive reaction force on the electrode terminal. Furthermore, this reduces the risk of distortion of the connector, shaking of the electrode terminal, and unstable electrical connections within the battery cell caused by excessive reaction force on the electrode terminal.

[0028] In one or more embodiments of the first aspect, the first wall includes a main body and a convex portion, the convex portion protrudes from the inner surface of the main body, and the outer surface of the first wall forms a concave portion at a position corresponding to the convex portion.

[0029] In the above solution, while forming the recess, the thickness of the first wall is reduced, thereby enabling the battery cell to have a higher energy density and also helping to reduce the manufacturing cost of the battery cell.

[0030] In one or more embodiments of the first aspect, the housing includes a shell and an end cover, the shell has an opening, the end cover closes the opening, and the first wall is the end cover.

[0031] In the above solution, the first wall being the end cover is conducive to reducing the difficulty of assembling the electrode terminal and the sealing member to the housing, thereby improving the production efficiency of the battery cell.

[0032] In one or more embodiments of the first aspect, the electrode terminal is a copper-aluminum composite electrode terminal.

[0033] In the above solution, by reducing the reaction force on the electrode terminal in the thickness direction of the first wall, it is beneficial to reduce the risk of composite interface separation of the electrode terminal, which may lead to electrical connection failure of the battery cell, and is beneficial to improving the service life of the electrode terminal.

[0034] In a second aspect, the present application provides a battery, comprising the battery cell according to one or more embodiments of the first aspect.

[0035] In the above solution, since the battery cells in one or more embodiments of the first aspect have high reliability, the battery including the battery cells in one or more embodiments of the first aspect also has high reliability.

[0036] In a third aspect, the present application provides an electrical device comprising a battery cell in one or more embodiments of the first aspect or a battery in one or more embodiments of the second aspect, wherein the battery cell or battery is used to provide electrical energy.

[0037] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0039] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0040] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0041] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0042] FIG4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0043] FIG5 is a partial enlarged view of point A in FIG4 ;

[0044] FIG6 is a cross-sectional view of a portion of a battery cell according to some embodiments of the present application;

[0045] FIG7 is a partial enlarged view of point B in FIG6;

[0046] FIG8 is a cross-sectional view of a portion of the structure of a battery cell according to some other embodiments of the present application.

[0047] The accompanying drawings in the specific implementation manner are as follows:

[0048] 1000-vehicle; 200-controller; 300-motor; 100-battery; 11-housing; 111-first housing; 112-second housing; 12-battery cell; 121-housing; 1210-first wall; 12101-recess; 12102-body; 12103-convex; 12104-first through hole; 1211-end cover; 1212-housing; 122-electrode assembly; 123-adapter; 124-electrode terminal; 1245-first pressing surface; 1246-second pressing surface; 125-third insulating member; 126-connecting member; 127-sealing member; 128-first insulating member; 1281-first insulating member body; 1282-first extension; 129-second insulating member; 1291-second insulating member body; 1292-second extension. DETAILED DESCRIPTION The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly used by those skilled in the art to which this application belongs. The terms used in this document are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. In the description of the embodiments of this application, the technical terms "first" and "second" are only used to distinguish different objects and should not be understood as Indicates or implies relative importance or implicitly indicates the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined. Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in the present application. The phrase "in at least one embodiment of the present invention" is used herein. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive with other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to "Multiple pieces" refers to two or more groups (including two groups); "multiple pieces" refers to two or more pieces (including two pieces). In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness" and " The directions or positional relationships indicated by terms such as "degrees", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial" and "circumferential" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the embodiments of the present application. In the description of the embodiments of this application, unless otherwise specified and limited, the technical terms "install", "connect", "connect", "fixed" and "installed" shall not be used interchangeably. Terms such as "fixed" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two elements or the interaction between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances. In this application, battery cells may include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium Lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc. The shape of the battery cell may include, but is not limited to, cylindrical, flat, rectangular, or other shapes. The battery cell packaging method may include, but is not limited to, cylindrical, prismatic, pouch, and blade battery cells. In some high-power applications such as electric vehicles, battery applications include three levels: battery cells, battery modules, and battery Blocks and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells. The following will mainly focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells or blade battery cells in some aspects. In a typical battery cell structure, the battery cell includes a casing, an electrode assembly and an electrolyte. The casing includes an end cover and a shell, and the end cover closes the opening of the shell to define a storage space for accommodating the electrode assembly. The electrode assembly is contained in the containing space, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. Metal ions work by moving between the positive and negative electrodes. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to pass high current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to winding or lamination. The tabs generally lead out the electrical energy of the electrode assembly by being electrically connected to the conductive member. In some cases, the conductive member is connected to the An adapter that connects the tabs to the electrode terminals. In some cases, the conductive member is the electrode terminal. Electrode terminals generally include positive and negative terminals. For rectangular battery cells, the electrode terminals are typically located in the end caps. In some other cases, the electrode terminals can also be located in the housing. Multiple battery cells can be connected in series and / or parallel via the electrode terminals for various applications. The development of battery technology must consider multiple design factors at the same time, such as energy density, cycle life, discharge capacity, Performance parameters such as charge and discharge rate, in addition, the reliability of the battery also needs to be considered. The electrode terminals of a conventional battery cell are arranged along the thickness direction of the wall of the shell. Electrode terminals typically extract electrical energy from the battery cell through electrical connections to other components along the thickness of the housing. Typically, the seals of battery cells are arranged along the thickness of the housing wall, effectively sealing the battery cell in an axial direction. After assembly, the seals are compressed by the electrode terminals. This creates a significant reaction force along the thickness of the housing wall on the electrode terminals, increasing the risk of separation between the electrode terminals and their electrically connected components and reducing the reliability of the battery cell. In view of this, the present application provides a battery cell, the battery cell includes a shell, an electrode terminal and a seal, the shell includes The first wall, the outer surface of the first wall is provided with a recessed portion sunken along the thickness direction of the first wall. A portion of the electrode terminal is accommodated in the recess. The outer peripheral surface of the electrode terminal includes a first pressing surface, and along the radial direction of the electrode terminal, at least a portion of the seal is provided between the first pressing surface and the inner peripheral surface of the recess, and the first pressing surface and the inner peripheral surface of the recess clamp the seal together. The seal seals the gap between the first pressing surface and the inner peripheral surface of the recess along the radial direction of the electrode terminal, so that the reaction force generated by the compressed seal acting on the electrode terminal along the thickness direction of the first wall is small, thereby making the risk of separation of the components connected to the electrode terminal from the electrode terminal relatively low, which is conducive to making the battery cell have higher conductive stability, and further conducive to improving the reliability of the battery cell. The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries. Electrical equipment includes but is not limited to: battery vehicles, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, Rockets, space shuttles, spacecraft, etc. For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application. For example, FIG1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, Gas-powered vehicle or new energy vehicle, the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 300, a controller 200 and a battery 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery 100 to power the motor 300. For example, a battery 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the starting, navigation and operating power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000. In order to meet different power requirements, the battery 100 may include a plurality of battery cells 12, wherein the plurality of battery cells The cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a combination of series and parallel connections. The battery 100 may also be referred to as a battery pack. Alternatively, multiple battery cells 12 may be connected in series, in parallel, or in a hybrid connection to form a battery module, and then multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, multiple battery cells 12 may be directly combined into the battery 100, or they may be first combined into battery modules, which are then combined into the battery 100. For example, please refer to FIG2 , which is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include multiple The battery 100 may further include a housing 11 having a hollow interior and housing multiple battery cells 12. As shown in FIG2 , these are referred to as a first housing body 111 and a second housing body 112, respectively. The first housing body 111 and the second housing body 112 are snap-fitted together. The shapes of the first housing body 111 and the second housing body 112 may be determined based on the shapes of the multiple battery cells 12. The first housing body 111 and the second housing body 112 may each have an opening. For example, the first housing body 111 and the second housing body 112 may both be hollow rectangular parallelepipeds with only one open face. The open face of the first housing body 111 and the open face of the second housing body 112 are arranged opposite to each other, and the first housing body 111 and the second housing body 112 snap-fit ​​together to form a housing 11 having a closed chamber. Multiple battery cells 12 are connected in parallel, in series, or in a mixed combination and then placed in the housing 11 formed by snapping the first housing body 111 and the second housing body 112 together. Optionally, the battery 100 may further include other structures, which will not be described in detail here. For example, the battery 100 may further include The busbar assembly is used to electrically connect multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar assembly can electrically connect the battery cells 12 by connecting to the electrode terminals 124 of the battery cells 12. Furthermore, the busbar assembly can be secured to the electrode terminals 124 of the battery cells 12 by welding. The electrical energy from the multiple battery cells 12 can be further extracted through the housing 11 via a conductive mechanism. The number of battery cells 12 can be set to any value according to different power requirements. The cells 12 can be connected in series, parallel, or in a hybrid configuration to achieve higher capacity or power. Since each battery 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery module. The number of battery cells 12 in a battery module is not limited and can be set as needed. The battery 100 may include multiple battery modules, which can be connected in series, parallel, or in a hybrid configuration. Please refer to FIG3 , which is an exploded view of a battery cell 12 in some embodiments of the present application. The battery cell 12 includes a One or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212. The multiple walls of the shell 1212, i.e., the multiple walls of the shell 121, form a cavity, which can be used to accommodate the electrode assembly 122. The shell 1212 is determined by the shape of the one or more electrode assemblies 122 after being combined. For example, the shell 1212 can be a hollow cuboid, a cube, or a regular polyhedron, and one of the faces of the shell 1212 has an opening so that the one or more electrode assemblies 122 can be placed in the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution. The battery cell 12 may further include two electrode terminals 124 , which may be disposed on the end cover 1211 . The end cap 1211 is typically a flat plate, with two electrode terminals 124 fixed to the flat surface of the end cap 1211. The two electrode terminals 124 are respectively a positive electrode terminal 124 and a negative electrode terminal 124. Each electrode terminal 124 is provided with an adapter 123, which is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 124. In this battery cell 12, the electrode assembly 122 can be provided as a single or multiple components depending on actual use. Multiple independent electrode assemblies 122 are provided within the battery cell 12. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the present application provides a battery cell 12 , a battery cell 12 includes a housing 121, an electrode terminal 124, and a sealing member 127. The housing 121 includes a first wall 1210. The outer surface of the first wall 1210 is provided with a recessed portion 12101 that is recessed along the thickness direction of the first wall 1210. A portion of the electrode terminal 124 is accommodated in the recessed portion 12101. The outer circumferential surface of the electrode terminal 124 includes a first pressing surface 1245. In the radial direction of the electrode terminal 124, at least a portion of the sealing member 127 is disposed between the first pressing surface 1245 and the inner circumferential surface of the recessed portion 12101. The first pressing surface 1245 and the inner circumferential surface of the recessed portion 12101 jointly clamp the sealing member 127. The material of the electrode terminal 124 may include but is not limited to aluminum, copper, etc. In the embodiment where the material of the electrode terminal 124 is copper, The copper electrode terminal 124 may also be provided with a nickel plating layer. In some embodiments, the material of the electrode terminal 124 is also an aluminum alloy. In other embodiments, the electrode terminal 124 may be a copper-aluminum composite electrode terminal 124, that is, the electrode terminal 124 includes at least two materials: copper and aluminum. The shape of the electrode terminal 124 can be a rotating body, a special shape, etc. The radial direction of the electrode terminal 124 refers to the direction of the electrode terminal 124. The radial direction of the circumscribed circle of the projection of the wall 1210 in the thickness direction. The material of the housing 121 may include but is not limited to copper, iron, aluminum, steel, aluminum alloy, etc. In some embodiments, the housing 121 can also be made of non-metallic materials. The shell 121 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 121 can be determined according to the electrode assembly. For example, if the electrode assembly 122 is a cylindrical structure, the outer shell 121 can be a cylindrical structure; if the electrode assembly 122 is a rectangular parallelepiped structure, the outer shell 121 can be a rectangular parallelepiped structure. In some embodiments, the housing 121 may include a shell 1212 and two end caps 1211, and the shell 1212 is on opposite sides. The housing 1212 has an open hollow structure, and an end cap 1211 is correspondingly covered at an opening of the housing 1212 to form a sealed connection, so as to form a sealed space for accommodating the electrode assembly 122 and the electrolyte. The first wall 1210 may be the end cover 1211 or any wall portion of the housing 1212 . The housing 121 generally has a receiving cavity inside, in which the electrode assembly 122 and the electrolyte are housed. The inner surface refers to a surface facing the electrode assembly 122 , and the outer surface of the first wall 1210 refers to a surface facing the outside of the housing 121 . In some embodiments, the first through hole 12104 passes through both sides of the first wall 1210 along the thickness direction of the first wall 1210. The electrode terminal 124 is inserted into the terminal hole along the thickness direction of the first wall 1210, so that part of the electrode terminal 124 is located in the first through hole 12104, so that the electrode terminal 124 can be connected to the electrode assembly 122 located inside the outer shell 121, and can also be connected to the busbar component located outside the outer shell 121 to realize the input or output of electrical energy of the battery cell 12. Alternatively, the electrode terminal 124 may be directly connected to the tab of the electrode assembly 122, for example, by welding or abutting. It can be indirectly connected to the tab of the electrode assembly 122 through other components. Similarly, the connection structure between the electrode terminal 124 and the busbar component can also be various, such as welding, abutment or clamping. In some embodiments, the electrode terminal 124 may be electrically connected to the tab of the electrode assembly 122 through the adapter 123 . If the force applied to the electrode terminal 124 in the thickness direction of the first wall 1210 is small, in some embodiments, the electrode terminal 124 The risk of separation from the adapter 123 is small. In some other embodiments, the risk of separation from the electrode terminal 124 and the busbar is small. In some other embodiments, the risk of separation from the electrode terminal 124 and the tab is small. In some embodiments, the electrode terminal 124 is a copper-aluminum composite electrode terminal 124. The electrode terminal 124 has both excellent electrical conductivity and chemical stability. However, due to differences in physical properties between copper and aluminum, such as thermal expansion coefficient and elastic modulus, there is a high risk of composite interface separation under external forces. If the force applied to the electrode terminal 124 in the thickness direction of the first wall 1210 is relatively small, the risk of composite interface separation can be reduced. The material of the sealing member 127 may include but is not limited to rubber, polyurethane, polytetrafluoroethylene, etc. Along the radial direction of the electrode terminal 124, at least a portion of the seal 127 is disposed between the first pressing surface 1245 and the recess 12101. The fact that the first pressing surface 1245 and the inner circumferential surface of the recess 12101 jointly clamp the seal 127 means that after assembly, the seal 127 will deform to a certain extent, and a portion of the seal 127 will contact and press against the first pressing surface 1245, and a portion of the seal 127 will contact and press against the inner circumferential surface of the recess 12101. In other words, the reaction force exerted by the seal 127 on the electrode terminal 124 is along the radial direction of the electrode terminal 124. In some embodiments, the first pressing surface 1245 and / or the inner circumference of the recess 12101 may be inclined relative to the first wall 1210. Place. In some embodiments, referring to FIG8 , the outer surface of the first wall 1210 is provided with an annular flange, and the inner circumference of the annular flange is provided with an annular flange. Recessed portion 12101 is formed. The concave portion 12101 can be formed by machining, or the convex portion 12103 can be formed by stamping the first wall 1210. form. In the technical solution of the embodiment of the present application, the seal 127 seals the first pressing surface 1245 and the electrode terminal 124 in the radial direction. The gap between the inner circumferential surfaces of the recess 12101 makes the reaction force generated by the compressed seal 127 acting on the electrode terminal 124 along the thickness direction of the first wall 1210 smaller, thereby making the risk of the components connected to the electrode terminal 124 separating from the electrode terminal 124 relatively low, which is beneficial for the battery cell 12 to have higher conductive stability, and further beneficial for improving the reliability of the battery cell 12. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the inner circumference of the recess 12101 and the bottom surface of the recess 12101 are The angle between them is the first obtuse angle. The angle between the inner circumference of the recess 12101 and the bottom surface of the recess 12101 is a first obtuse angle, which means that the seal 127 is installed The inner circumference of the timing recess 12101 can guide it, reducing the difficulty of assembly. And after assembly is completed, it is easier to deform the sealing member 127 to press against the first pressing surface 1245 and the inner circumference of the recess 12101. In the above solution, the angle between the inner circumference of the concave portion 12101 and the bottom surface of the concave portion 12101 is a first obtuse angle, which can be used to reduce the The electrode terminal 124 receives a force in the thickness direction of the first wall 1210 while reducing the difficulty of assembling the sealing member 127 . According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the electrode terminal 124 has a second pressing surface 1246 , along the first In the thickness direction of the wall 1210 , the second pressing surface 1246 and the bottom surface of the recess 12101 are arranged opposite to each other, the first pressing surface 1245 is connected to the second pressing surface 1246 , and the angle between the first pressing surface 1245 and the second pressing surface 1246 is a second obtuse angle. The angle between the first pressing surface 1245 and the second pressing surface 1246 is a second obtuse angle, which means that when the seal 127 is assembled, The first pressing surface 1245 can guide it, reducing the difficulty of assembly, and making it easier to deform the first sealing member 127 to press against the first pressing surface 1245 and the inner circumference of the recess 12101 after assembly. In the above solution, the angle between the first pressing surface 1245 and the second pressing surface 1246 is a second obtuse angle, which can further reduce the The difficulty of assembling a seal 127. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the battery cell 12 further includes a first insulating member 128 . In the thickness direction of the wall 1210 , at least a portion of the first insulating member 128 is located between the second pressing surface 1246 and the bottom surface of the recess 12101 . Along the thickness direction of the first wall 1210, at least a portion of the first insulating member 128 is disposed between the bottom surface of the recess 12101 and the second wall 1210. Between the pressing surfaces 1246 , it means that the first insulating member 128 can be used to insulate and isolate the first wall 1210 and the electrode terminal 124 . The material of the first insulating member 128 may include but is not limited to rubber, silicone, or plastic. The shape of the first insulating member 128 may include, but is not limited to, a straight shape, an L shape, a wavy shape, and the like. In the above solution, the provision of the first insulating member 128 can reduce the wind direction of the electrode terminal 124 short-circuiting with the first wall 1210. This is beneficial to improving the insulation performance of the electrode terminal 124 and the first wall 1210 , thereby improving the reliability of the battery cell 12 . According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , a first through hole 12104 is provided on the bottom surface of the recess 12101 . At least a portion of the electrode terminal 124 is disposed within the first through-hole 12104. The first insulating member 128 includes a first insulating member body 1281 and a first extending portion 1282. Along the thickness direction of the first wall 1210, the first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246, and at least a portion of the first extending portion 1282 is located within the first through-hole 12104. The first through hole 12104 can be formed by machining, or can be formed together with the first wall 1210 by casting or 3D printing. The first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246, which means that the first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246. An insulating body 1281 can insulate and isolate the electrode terminal 124 from the first wall 1210 . At least part of the electrode terminal 124 is disposed in the first through hole 12104, which means that in the thickness direction of the first wall 1210 , one end surface of the electrode terminal 124 is located in the first through hole 12104 or the electrode terminal 124 is passed through the first through hole 12104 . In the above solution, at least a portion of the first extension portion 1282 is located in the first through hole 12104, which can reduce the The risk of short circuit with the hole wall of the first through hole 12104 is reduced, which is beneficial to improving the reliability of the battery cell 12. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , along the radial direction of the electrode terminal 124 , the first extension portion 1282 There is a first gap between the electrode terminal 124 . In some embodiments, the portion of the electrode terminal 124 located in the first through hole 12104 is welded to the adapter 123. The provision of the gap can reduce the risk of heat accumulation during welding causing deformation or even melting of a portion of the first insulating member 128 , leading to insulation failure of the first insulating member 128 . In some embodiments, the portion of the electrode terminal 124 located in the first through hole 12104 is welded to the tab, and the first gap This configuration can reduce the risk of heat accumulation during welding causing deformation or even melting of a portion of the first insulating member 128 , leading to insulation failure of the first insulating member 128 . In the above solution, the setting of the first gap can provide a certain assembly space for the electrode terminal 124, thereby reducing the assembly process. There is a risk that the first insulating member 128 may be damaged, resulting in insulation failure of the first insulating member 128 . According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the battery cell 12 further includes a transition piece 123 and an electrode assembly. 122, the electrode assembly 122 is disposed within the housing 121, and the adapter 123 electrically connects the electrode terminal 124 and the electrode assembly 122. The battery cell 12 also includes a second insulating member 129, along the thickness direction of the first wall 1210, with at least a portion of the second insulating member 129 disposed between the inner surface of the first wall 1210 and the adapter 123. The material of the adapter 123 can be the same as or different from the material of the electrode terminal 124 . In some embodiments, the material of the adapter 123 is the same as the material of the portion where the electrode terminal 124 and the adapter 123 are connected. For example, the connection position between the two is copper to copper or aluminum to aluminum. In some embodiments, the adapter 123 is electrically connected to the tab of the electrode assembly 122 and is electrically connected to the electrode terminal 124 . In some embodiments, the adapter 123 is a sheet metal structure. The adapter 123 may be a flat plate structure or a structure with a protrusion or a recess 12101. For example, the adapter The cross-sectional shape of 123 can be L-shaped, Z-shaped, or an X-shaped. Along the thickness direction of the first wall 1210, at least a portion of the second insulating member 129 is disposed on the inner surface of the first wall 1210 and Between the adapter 123 , it means that the second insulating member 129 can be used to insulate and isolate the first wall 1210 and the adapter 123 . The material of the second insulating member 129 may include but is not limited to rubber, silicone, or plastic. The shape of the second insulating member 129 may include, but is not limited to, a straight shape, an L shape, a wavy shape, and the like. In the above solution, the adapter 123 electrically connects the electrode terminal 124 and the electrode assembly 122, and is sealed in a radial sealing manner. The first pressing surface 1245 and the inner circumference of the recess 12101 help reduce the risk of separation between the electrode terminal 124 and the adapter 123. At least a portion of the second insulating member 129 is disposed between the inner surface of the first wall 1210 and the adapter 123, which reduces the risk of a short circuit between the adapter 123 and the inner surface of the first wall 1210, thereby improving the reliability of the battery cell 12. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the second insulating member 129 includes a second insulating member body 1291 And the second extension portion 1292, along the thickness direction of the first wall 1210, the second insulating member body 1291 is arranged between the inner surface of the first wall 1210 and the adapter 123, and in the radial direction of the electrode terminal 124, at least a portion of the second extension portion 1292 is located in the first through hole 12104. The second insulating member body 1291 is disposed between the outer surface of the first wall 1210 and the adapter 123, which means that the second insulating member body 1291 is disposed between the outer surface of the first wall 1210 and the adapter 123. The component body 1291 can insulate and isolate the adapter 123 and the first wall 1210 . In the above solution, at least a portion of the second extension portion 1292 is located in the first through hole 12104, which can reduce the and / or the risk of short circuit between the adapter 123 and the hole wall of the first through hole 12104, thereby helping to improve the reliability of the battery cell 12. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , along the radial direction of the electrode terminal 124 , the second extension portion 1292 There is a second gap between the electrode terminal 124 . In some embodiments, the portion of the electrode terminal 124 located in the first through hole 12104 is welded to the adapter 123, and the second The provision of the gap can reduce the risk of heat accumulation during welding causing deformation or even melting of part of the second insulating member 129 and leading to insulation failure of the first insulating member 128. In the above solution, the second gap can provide a certain assembly space for the electrode terminal 124 and / or the adapter 123. The risk of insulation failure of the second insulating member 129 due to damage to the second insulating member 129 during assembly is reduced. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , along the radial direction of the electrode terminal 124 , the second extension portion 1292 At least a portion of is located between the first extension portion 1282 and the electrode terminal 124 . At least a portion of the second extension portion 1292 is located between the first extension portion 1282 and the electrode terminal 124, which means that the first extension portion 1292 is located between the first extension portion 1282 and the electrode terminal 124. The edge member 128 and the second insulating member 129 can be positioned relative to each other after being assembled. In some embodiments, along the radial direction of the electrode terminal 124, the projection of the first extension portion 1282 and the second extension portion 1292 to In other embodiments, referring to FIG. 7 , along the radial direction of the electrode terminal 124 , the projections of the first extension portion 1282 and the second extension portion 1292 at least partially overlap, and the first extension portion 1282 and the second extension portion 1292 abut against each other. In the above solution, at least a portion of the second extension portion 1292 is located between the first extension portion 1282 and the electrode terminal 124. On the one hand, the second insulating member 129 and the first insulating member 128 can constrain each other, reducing the risk of shaking and enhancing structural stability. On the other hand, the risk of shorting between the electrode terminal 124 and / or the adapter 123 and the hole wall of the first through hole 12104 can be further reduced. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the battery cell 12 further includes a connector 126 and a third insulating The first wall 1210 and the connecting member 126 protrude from the outer surface of the first wall 1210 and surround the electrode terminal 124. The third insulating member 125 connects the electrode terminal 124 and the connecting member 126 to separate the connecting member 126 from the electrode terminal 124. The connecting member 126 protrudes from the outer surface of the first wall 1210 and surrounds the electrode terminal 124, which means that the connecting member 126 It is ring-shaped. The cross section of the connecting member 126 may be L-shaped, Z-shaped, linear, wavy, etc. The material of the connecting member 126 can be the same as or different from the material of the first wall 1210. In embodiments where the materials of the first wall 1210 are the same, the connector 126 is connected to the first wall 1210 by welding. Welding the same materials is relatively easy, and the risk of weld defects is relatively low. In other embodiments, the connector 126 can be integrally formed with the first wall 1210, for example, by casting, machining, or the like. In some embodiments, the connector 126 may be connected to the first wall 1210 by bolting, clamping, or bonding. The third insulating member 125 can be pre-formed and assembled between the connecting member 126 and the electrode terminal 124, or can be formed by injection molding. The process is formed between the connector 126 and the electrode terminal 124. The material of the third insulating member 125 may include but is not limited to rubber, silicone or plastic. The third insulating member 125 connects the connecting member 126 and the electrode terminal 124 , and is used to separate the connecting member 126 and the electrode terminal 124 . This means that the connection member 126 can limit the position of the electrode terminal 124 by limiting the position of the third insulating member 125 . This also means that the third insulating member 125 can be used to insulate and isolate the connection member 126 from the electrode terminal 124 . In some embodiments, the third insulating member 125 is further provided with an anti-rotation mechanism that cooperates with the connecting member 126 and / or the electrode terminal 124. structure. In the above solution, the electrode terminal 124 is clamped and fixed by the connecting member 126 and the first wall 1210. Both ends of the first wall 1210 in the thickness direction are restrained, significantly reducing the risk of separation between the electrode terminal 124 and its connected components through radial sealing. This also reduces the risk of insulation failure of the third insulating member 125 due to excessive reaction force on the electrode terminal 124. Furthermore, this reduces the risk of excessive reaction force on the electrode terminal 124 causing distortion of the connector 126, shaking of the electrode terminal 124, and unstable electrical connection of the battery cell 12. According to some embodiments of the present application, referring to FIG3-FIG7, in one or more embodiments of the first aspect, the first The wall 1210 includes a main body 12102 and a convex portion 12103 . The convex portion 12103 protrudes from the inner surface of the main body 12102 . A concave portion 12101 is formed on the outer surface of the first wall 1210 at a position corresponding to the convex portion 12103 . In some embodiments, the first wall 1210 is formed into a convex portion 12103 by stamping. A recess 12101 may be formed at a position corresponding to 12103 . The convex portion 12103 and the concave portion 12101 may also be formed by machining. In the above solution, while forming the recess 12101, it is beneficial to reduce the thickness of the first wall 1210, so that the battery cell The battery cell 12 has a high energy density and is also beneficial to reducing the manufacturing cost of the battery cell 12. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the housing 121 includes a shell 1212 and an end cover 1211. 1212 has an opening, the end cover 1211 closes the opening, and the first wall 1210 serves as the end cover 1211 . The first wall 1210 is an end cover 1211 , that is, the electrode terminal 124 and the sealing member 127 are both disposed on the end cover 1211 of the outer shell 121 . In some embodiments, the first insulating member 128 is also disposed on the end cover 1211 . In some embodiments, the second insulating member 129 is also disposed on the end cover 1211 . In some embodiments, the third insulating member 125 is also disposed on the end cover 1211 . In some embodiments, the connector 126 is also disposed on the end cap 1211 . In the above solution, the first wall 1210 is the end cap 1211, which is conducive to reducing the assembly of the electrode terminal 124 and the seal 127 to the outer The difficulty of the shell 121 is improved to improve the production efficiency of the battery cell 12. According to some embodiments of the present application, the electrode terminal 124 is a copper-aluminum composite electrode terminal 124 . Since the electrode terminal 124 is a copper-aluminum composite electrode terminal 124, the electrode terminal 124 has a composite interface. 124 When subjected to external forces or when there are internal stresses, the risk of composite interface connection failure is higher. In the above solution, by reducing the reaction force on the electrode terminal 124 in the thickness direction of the first wall 1210, it is advantageous to This helps reduce the risk of separation of the composite interface of the electrode terminal 124 , which may lead to electrical connection failure of the battery cell 12 , and is beneficial for increasing the service life of the electrode terminal 124 . According to some embodiments of the present application, referring to FIG. 2 , the present application provides a battery 100, which includes the above-mentioned The battery cell 12 in one or more embodiments. In the above solution, since the battery cell 12 in one or more of the above embodiments has high reliability, The battery 100 including the battery cell 12 in the above embodiment also has high reliability. According to some embodiments of the present application, please refer to FIG1 , the present application provides an electrical device, which includes one or more of the above The battery cell 12 in the above embodiments or the battery 100 in one or more embodiments are used to provide electrical energy. In the above solution, since the battery cell 12 in one or more of the above embodiments has high reliability, The electrical equipment including the battery cell 12 in one or more of the above embodiments also has high reliability; or, because the battery 100 in one or more of the above embodiments has high reliability, the electrical equipment including the battery 100 in one or more of the above embodiments also has high reliability. According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the present application provides a battery cell 12 , the battery cell 12 The housing 121 includes an outer shell 121, an electrode terminal 124, a sealing member 127, a first insulating member 128, a second insulating member 129, a third insulating member 125, a connecting member 126, an electrode assembly 122, and a transition member 123. The electrode assembly 122 is disposed within the outer shell 121, and the transition member 123 electrically connects the electrode terminal 124 and the electrode assembly 122. The outer shell 121 includes a first wall 1210, the outer surface of which is provided with a recessed portion 12101 that is recessed along the thickness direction of the first wall 1210. The outer shell 121 includes a shell 1212 and an end cap 1211. The shell 1212 has an opening, which is sealed by the end cap 1211. The first wall 1210 includes a body 12102 and a protrusion 12103. The protrusion 12103 protrudes from the inner surface of the body 12102. The outer surface of the first wall 1210 forms a recess 12101 at a position corresponding to the protrusion 12103. The bottom surface of the recess 12101 is provided with a first through-hole 12104. At least a portion of the electrode terminal 124 is disposed within the first through-hole 12104. The connector 126 protrudes from the outer surface of the first wall 1210 and surrounds the electrode terminal 124. The third insulating member 125 connects the electrode terminal 124 and the connector 126, separating the connector 126 from the electrode terminal 124. The first wall 1210 is the end cap 1211, and the electrode terminal 124 is a copper-aluminum composite electrode terminal 124. A portion of the electrode terminal 124 is accommodated in the recess 12101. The outer peripheral surface of the electrode terminal 124 includes a first pressing Surface 1245. Along the radial direction of electrode terminal 124, at least a portion of seal 127 is disposed between first pressing surface 1245 and the inner circumferential surface of recess 12101. First pressing surface 1245 and the inner circumferential surface of recess 12101 jointly clamp seal 127. The angle between the inner circumferential surface of recess 12101 and the bottom surface of recess 12101 is a first obtuse angle. Electrode terminal 124 has second pressing surface 1246. Along the thickness direction of first wall 1210, second pressing surface 1246 and the bottom surface of recess 12101 are disposed opposite each other. First pressing surface 1245 connects to second pressing surface 1246, and the angle between first pressing surface 1245 and second pressing surface 1246 is a second obtuse angle. The first insulating member 128 includes a first insulating member body 1281 and a first extending portion 1282 , along the thickness direction of the first wall 1210 . The first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246, and at least a portion of the first extension portion 1282 is located within the first through-hole 12104. The second insulating member 129 includes a second insulating member body 1291 and a second extension portion 1292. Along the thickness direction of the first wall 1210, the second insulating member body 1291 is disposed between the inner surface of the first wall 1210 and the adapter 123. In the radial direction of the electrode terminal 124, at least a portion of the second extension portion 1292 is located within the first through-hole 12104. Along the radial direction of the electrode terminal 124, a first gap is formed between the first extension portion 1282 and the electrode terminal 124. The second extension portion 1282 is A second gap is defined between the second extension portion 1292 and the electrode terminal 124 . At least a portion of the second extension portion 1292 is located between the first extension portion 1282 and the electrode terminal 124 . The seal 127 seals the gap between the first pressing surface 1245 and the inner circumferential surface of the recess 12101 in the radial direction of the electrode terminal 124. The gap makes the reaction force generated by the compressed seal 127 acting on the electrode terminal 124 along the thickness direction of the first wall 1210 smaller, thereby making the risk of the components connected to the electrode terminal 124 being separated from the electrode terminal 124 relatively low, which is beneficial for the battery cell 12 to have higher conductive stability, and further beneficial for improving the reliability of the battery cell 12.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims. The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application and are therefore only examples and cannot be used to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0051] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0052] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shape of a battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shapes. Battery cells, depending on the packaging method, may include, but are not limited to, cylindrical battery cells, prismatic battery cells, soft-pack battery cells, and blade battery cells.

[0057] In high-power applications such as electric vehicles, battery applications include three levels: battery cells, battery modules, and batteries. A battery module is a system consisting of a number of battery cells electrically connected together and housed in a frame to protect the cells from external shock, heat, and vibration. A battery refers to the final battery system installed in an electric vehicle. The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. A battery generally includes a casing that encloses one or more battery cells. The casing reduces the risk of liquids or other foreign matter affecting the charging or discharging of the battery cells. The following description will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some aspects to cylindrical, pouch, or blade-shaped battery cells. In a typical battery cell structure, a battery cell includes an outer casing, an electrode assembly, and an electrolyte. The outer casing includes end caps and a housing. The end caps seal the opening of the housing to define a space for accommodating the electrode assembly.

[0058] The electrode assembly is housed in the housing. It includes a positive electrode sheet, a negative electrode sheet, and a separator. Battery cells primarily operate by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, serving as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, serving as the negative electrode tab. The negative electrode collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials. In order to pass high current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to winding or lamination.

[0059] The tabs typically extract electrical energy from the electrode assembly by electrically connecting to conductive members. In some cases, the conductive members are adapters that connect the tabs to the electrode terminals; in other cases, the conductive members are the electrode terminals. Electrode terminals generally include positive and negative terminals. For rectangular battery cells, the electrode terminals are typically located in the end caps. In other cases, the electrode terminals can also be located in the housing. Multiple battery cells are connected in series and / or in parallel via the electrode terminals for various applications.

[0060] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0061] Typically, the electrode terminals of a battery cell are inserted through the wall of the outer casing along its thickness. Along this thickness, the electrode terminals typically draw electrical energy from the battery cell through electrical connections to other components. Typically, the seals of a battery cell are arranged along the thickness of the outer casing, effectively sealing the battery cell in an axial direction. After assembly, the seals are compressed by the electrode terminals. At this point, the reaction force exerted by the seals on the electrode terminals along the thickness of the outer casing is significant, increasing the risk of separation between the electrode terminals and their electrically connected components and reducing the reliability of the battery cell.

[0062] In view of this, the present application provides a battery cell, which includes a shell, an electrode terminal and a seal. The shell includes a first wall, and the outer surface of the first wall is provided with a recessed portion that is recessed along the thickness direction of the first wall. A portion of the electrode terminal is accommodated in the recess. The outer peripheral surface of the electrode terminal includes a first pressing surface, and along the radial direction of the electrode terminal, at least a portion of the seal is provided between the first pressing surface and the inner peripheral surface of the recess, and the first pressing surface and the inner peripheral surface of the recess jointly clamp the seal. The seal seals the gap between the first pressing surface and the inner peripheral surface of the recess along the radial direction of the electrode terminal, so that the reaction force generated by the compressed seal acting on the electrode terminal along the thickness direction of the first wall is small, thereby making the risk of separation of the components connected to the electrode terminal from the electrode terminal relatively low, which is conducive to making the battery cell have higher conductive stability, and further conducive to improving the reliability of the battery cell.

[0063] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0064] Electrical equipment includes, but is not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0065] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0066] For example, FIG1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 300, a controller 200, and a battery 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as the operating power source of the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for the starting, navigation, and operation power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] To meet different power requirements, the battery 100 may include multiple battery cells 12, wherein the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, multiple battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, multiple battery cells 12 may directly form the battery 100, or they may first form battery modules, which may then form the battery 100.

[0068] For example, please refer to Figure 2, which is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include a plurality of battery cells 12. The battery 100 may also include a housing 11, which has a hollow interior and houses the plurality of battery cells 12. As shown in Figure 2, these are referred to herein as a first housing body 111 and a second housing body 112, respectively. The first housing body 111 and the second housing body 112 are snap-fitted together. The shapes of the first housing body 111 and the second housing body 112 can be determined based on the shape of the plurality of battery cells 12. The first housing body 111 and the second housing body 112 may each have an opening. For example, the first housing body 111 and the second housing body 112 may each be a hollow rectangular parallelepiped, each having only one open face. The open face of the first housing body 111 and the open face of the second housing body 112 are disposed opposite each other, and the first housing body 111 and the second housing body 112 snap-fit ​​together to form the housing 11 having a closed chamber. The plurality of battery cells 12 are connected in parallel, in series or in a mixed combination and are placed in the box body 11 formed by buckling the first box body 111 and the second box body 112 .

[0069] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery 100 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 12 by connecting the electrode terminals 124 of the battery cells 12. Furthermore, the busbar component can be fixed to the electrode terminals 124 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the box 11 via a conductive mechanism.

[0070] The number of battery cells 12 can be set to any value according to different power requirements. Multiple battery cells 12 can be connected in series, parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery 100 may include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0071] Please refer to Figure 3, which is an exploded view of a battery cell 12 in some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a shell 121. The shell 121 may include a housing 1212. The multiple walls of the housing 1212, i.e., the multiple walls of the housing 121, form a cavity, which can be used to accommodate the electrode assembly 122. The housing 1212 is determined according to the shape of the one or more electrode assemblies 122 after being combined. For example, the housing 1212 can be a hollow cuboid, a cube, or a regular polyhedron, and one of the faces of the housing 1212 has an opening so that one or more electrode assemblies 122 can be placed in the housing 1212. The housing 1212 is filled with an electrolyte, such as an electrolyte solution.

[0072] The battery cell 12 may also include two electrode terminals 124, which may be provided on the end cap 1211. The end cap 1211 is generally in the shape of a flat plate, and the two electrode terminals 124 are fixed to the flat surface of the end cap 1211. The two electrode terminals 124 are respectively a positive electrode terminal 124 and a negative electrode terminal 124. Each electrode terminal 124 is provided with a corresponding adapter 123, which is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 124. In the battery cell 12, the electrode assembly 122 may be provided as a single electrode assembly or as multiple electrode assemblies 122 according to actual use requirements. A plurality of independent electrode assemblies 122 are provided in the battery cell 12.

[0073] According to some embodiments of the present application, please refer to Figures 3 to 7. The present application provides a battery cell 12, which includes a housing 121, an electrode terminal 124, and a seal 127. The housing 121 includes a first wall 1210. The outer surface of the first wall 1210 is provided with a recessed portion 12101 that is recessed along the thickness direction of the first wall 1210. A portion of the electrode terminal 124 is accommodated in the recessed portion 12101. The outer circumferential surface of the electrode terminal 124 includes a first pressing surface 1245. Along the radial direction of the electrode terminal 124, at least a portion of the seal 127 is provided between the first pressing surface 1245 and the inner circumferential surface of the recessed portion 12101. The first pressing surface 1245 and the inner circumferential surface of the recessed portion 12101 jointly clamp the seal 127.

[0074] The electrode terminal 124 may be made of, but not limited to, aluminum, copper, or the like. In embodiments where the electrode terminal 124 is made of copper, the copper electrode terminal 124 may also be provided with a nickel plating layer. In some embodiments, the electrode terminal 124 may be made of an aluminum alloy. In other embodiments, the electrode terminal 124 may be a copper-aluminum composite electrode terminal 124, meaning that the electrode terminal 124 comprises at least copper and aluminum.

[0075] The shape of the electrode terminal 124 may be a body of revolution, a special shape, etc. The radial direction of the electrode terminal 124 refers to the radial direction of the circumscribed circle of the projection of the electrode terminal 124 in the thickness direction of the first wall 1210 .

[0076] The material of the housing 121 may include, but is not limited to, copper, iron, aluminum, steel, aluminum alloy, etc. In some embodiments, the housing 121 may also be made of non-metallic materials.

[0077] The housing 121 can have various shapes, such as a cylinder, a cuboid, etc. The shape of the housing 121 can be determined based on the specific shape of the electrode assembly 122. For example, if the electrode assembly 122 has a cylindrical structure, the housing 121 can have a cylindrical structure; if the electrode assembly 122 has a cuboid structure, the housing 121 can have a cuboid structure.

[0078] In some embodiments, the housing 121 may include a shell 1212 and two end caps 1211. The shell 1212 is a hollow structure with openings on opposite sides. One end cap 1211 covers one opening of the shell 1212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 122 and the electrolyte.

[0079] The first wall 1210 may be the end cover 1211 or any wall portion of the housing 1212 .

[0080] The housing 121 generally has a cavity inside, which contains the electrode assembly 122 and the electrolyte. The inner surface of the first wall 1210 refers to the surface facing the electrode assembly 122, and the outer surface of the first wall 1210 refers to the surface facing the outside of the housing 121.

[0081] In some embodiments, the first through hole 12104 passes through both sides of the first wall 1210 along the thickness direction of the first wall 1210, and the electrode terminal 124 is inserted into the terminal hole along the thickness direction of the first wall 1210, so that part of the electrode terminal 124 is located in the first through hole 12104, so that the electrode terminal 124 can be connected to the electrode assembly 122 located inside the outer shell 121, and can also be connected to the busbar component located outside the outer shell 121 to realize the input or output of electrical energy of the battery cell 12.

[0082] Optionally, the electrode terminal 124 may be directly connected to the tab of the electrode assembly 122, such as by welding or abutting, or may be indirectly connected to the tab of the electrode assembly 122 via other components. Similarly, the connection structure between the electrode terminal 124 and the busbar component may also be various, such as welding, abutting, or clamping.

[0083] In some embodiments, the electrode terminal 124 may be electrically connected to the tab of the electrode assembly 122 through the adapter 123 .

[0084] If the force applied to the electrode terminal 124 in the thickness direction of the first wall 1210 is small, in some embodiments, the risk of separation of the electrode terminal 124 from the adapter 123 is small. In other embodiments, the risk of separation of the electrode terminal 124 from the busbar is small. In still other embodiments, the risk of separation of the electrode terminal 124 from the tab is small.

[0085] In some embodiments, the electrode terminal 124 is a copper-aluminum composite electrode terminal 124. Using a copper-aluminum composite electrode terminal 124 allows the electrode terminal 124 to have both excellent electrical conductivity and chemical stability. However, due to differences in physical properties between copper and aluminum, such as thermal expansion coefficient and elastic modulus, there is a higher risk of composite interface separation under external forces. If the force applied to the electrode terminal 124 in the thickness direction of the first wall 1210 is relatively small, the risk of composite interface separation can be reduced.

[0086] The material of the sealing member 127 may include but is not limited to rubber, polyurethane, polytetrafluoroethylene, etc.

[0087] Along the radial direction of the electrode terminal 124, at least a portion of the seal 127 is disposed between the first pressing surface 1245 and the inner circumferential surface of the recess 12101. The first pressing surface 1245 and the inner circumferential surface of the recess 12101 jointly clamp the seal 127. This means that after assembly, the seal 127 will deform to a certain extent, and a portion of the seal 127 will contact and abut against the first pressing surface 1245, and a portion of the seal 127 will contact and abut against the inner circumferential surface of the recess 12101. In other words, the reaction force exerted by the seal 127 on the electrode terminal 124 is along the radial direction of the electrode terminal 124.

[0088] In some embodiments, the first pressing surface 1245 and / or the inner circumferential surface of the recess 12101 may be tilted relative to the first wall 1210 .

[0089] In some embodiments, referring to FIG. 8 , an annular flange is provided on the outer surface of the first wall 1210 , and a recess 12101 is formed on the inner circumference of the annular flange.

[0090] The recess 12101 may be formed by machining, or by punching the first wall 1210 to form the protrusion 12103 .

[0091] In the technical solution of the embodiment of the present application, the seal 127 seals the gap between the first clamping surface 1245 and the inner circumferential surface of the recess 12101 along the radial direction of the electrode terminal 124, so that the reaction force generated by the compressed seal 127 acting on the electrode terminal 124 along the thickness direction of the first wall 1210 is relatively small, thereby making the risk of separation of the components connected to the electrode terminal 124 from the electrode terminal 124 relatively low, which is beneficial to making the battery cell 12 have higher conductive stability, and further beneficial to improving the reliability of the battery cell 12.

[0092] According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the angle between the inner circumferential surface of the recess 12101 and the bottom surface of the recess 12101 is a first obtuse angle.

[0093] The angle between the inner circumference of recess 12101 and the bottom surface of recess 12101 is a first obtuse angle, which means that the inner circumference of recess 12101 can guide the seal 127 during assembly, reducing assembly difficulty. Furthermore, after assembly, it is easier for the seal 127 to deform and press against the first pressing surface 1245 and the inner circumference of recess 12101.

[0094] In the above solution, the angle between the inner circumference of the recess 12101 and the bottom surface of the recess 12101 is a first obtuse angle, which can reduce the force on the electrode terminal 124 in the thickness direction of the first wall 1210 while reducing the difficulty of assembling the seal 127.

[0095] According to some embodiments of the present application, please refer to Figures 3 to 7. The electrode terminal 124 has a second pressing surface 1246. Along the thickness direction of the first wall 1210, the second pressing surface 1246 and the bottom surface of the recess 12101 are arranged opposite to each other, and the first pressing surface 1245 is connected to the second pressing surface 1246. The angle between the first pressing surface 1245 and the second pressing surface 1246 is a second obtuse angle.

[0096] The angle between the first pressing surface 1245 and the second pressing surface 1246 is a second obtuse angle, which means that the first pressing surface 1245 can guide the seal 127 during assembly, reducing assembly difficulty. Furthermore, after assembly, it is easier for the first seal 127 to deform and press against the first pressing surface 1245 and the inner circumference of the recess 12101.

[0097] In the above solution, the included angle between the first pressing surface 1245 and the second pressing surface 1246 is the second obtuse angle, which can further reduce the difficulty of assembling the first sealing member 127 .

[0098] According to some embodiments of the present application, referring to Figures 3 to 7, the battery cell 12 further includes a first insulating member 128. Along the thickness direction of the first wall 1210, at least a portion of the first insulating member 128 is located between the second pressing surface 1246 and the bottom surface of the recess 12101.

[0099] Along the thickness direction of the first wall 1210 , at least a portion of the first insulating member 128 is disposed between the bottom surface of the recess 12101 and the second pressing surface 1246 , which means that the first insulating member 128 can be used to insulate and isolate the first wall 1210 and the electrode terminal 124 .

[0100] The material of the first insulating member 128 may include but is not limited to rubber, silicone, or plastic.

[0101] The shape of the first insulating member 128 may include, but is not limited to, a straight shape, an L shape, a wavy shape, and the like.

[0102] In the above solution, the provision of the first insulating member 128 can reduce the direction of short circuit between the electrode terminal 124 and the first wall 1210 , which is beneficial to improving the insulation performance of the electrode terminal 124 and the first wall 1210 , and further beneficial to improving the reliability of the battery cell 12 .

[0103] According to some embodiments of the present application, referring to Figures 3-7 , a first through-hole 12104 is provided on the bottom surface of the recess 12101, and at least a portion of the electrode terminal 124 is disposed within the first through-hole 12104. The first insulating member 128 includes a first insulating member body 1281 and a first extending portion 1282. Along the thickness direction of the first wall 1210, the first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246, and at least a portion of the first extending portion 1282 is located within the first through-hole 12104.

[0104] The first through hole 12104 can be formed by machining, or can be formed together with the first wall 1210 by casting or 3D printing.

[0105] The first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246 , which means that the first insulating member body 1281 can insulate and isolate the electrode terminal 124 from the first wall 1210 .

[0106] At least a portion of the electrode terminal 124 is disposed in the first through hole 12104 , which means that in the thickness direction of the first wall 1210 , one end surface of the electrode terminal 124 is located in the first through hole 12104 or the electrode terminal 124 passes through the first through hole 12104 .

[0107] In the above solution, at least a portion of the first extension portion 1282 is located within the first through hole 12104 , which can reduce the risk of short circuit between the electrode terminal 124 and the hole wall of the first through hole 12104 , thereby facilitating improved reliability of the battery cell 12 .

[0108] According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , along the radial direction of the electrode terminal 124 , a first gap is defined between the first extension portion 1282 and the electrode terminal 124 .

[0109] In some embodiments, the portion of the electrode terminal 124 located in the first through hole 12104 will be welded to the adapter 123. The setting of the first gap can reduce the risk of heat accumulation during welding causing part of the first insulating member 128 to deform or even melt, resulting in insulation failure of the first insulating member 128.

[0110] In some embodiments, the portion of the electrode terminal 124 located in the first through hole 12104 will be welded to the tab. The setting of the first gap can reduce the risk of heat accumulation during welding causing part of the first insulating member 128 to deform or even melt, resulting in insulation failure of the first insulating member 128.

[0111] In the above solution, the provision of the first gap can provide a certain assembly space for the electrode terminal 124 , thereby reducing the risk of insulation failure of the first insulating member 128 due to damage to the first insulating member 128 during the assembly process.

[0112] According to some embodiments of the present application, referring to Figures 3-7 , the battery cell 12 further includes an adapter 123 and an electrode assembly 122. The electrode assembly 122 is disposed within the housing 121, and the adapter 123 electrically connects the electrode terminal 124 and the electrode assembly 122. The battery cell 12 further includes a second insulating member 129. At least a portion of the second insulating member 129 is disposed between the inner surface of the first wall 1210 and the adapter 123 along the thickness direction of the first wall 1210.

[0113] The material of the adapter 123 can be the same as or different from the material of the electrode terminal 124 .

[0114] In some embodiments, the material of the adapter 123 is the same as the material of the portion where the electrode terminal 124 and the adapter 123 are connected. For example, the connection between the two is copper to copper or aluminum to aluminum.

[0115] In some embodiments, the adapter 123 is electrically connected to the tab of the electrode assembly 122 and is electrically connected to the electrode terminal 124 .

[0116] In some embodiments, the adapter 123 is a sheet metal structure.

[0117] The adapter 123 may be a flat plate structure, or may be a structure having a protrusion or recess 12101. For example, the cross-sectional shape of the adapter 123 may be L-shaped, Z-shaped, or an X-shaped.

[0118] Along the thickness direction of the first wall 1210 , at least a portion of the second insulating member 129 is disposed between the inner surface of the first wall 1210 and the adapter 123 , meaning that the second insulating member 129 can be used to insulate and isolate the first wall 1210 and the adapter 123 .

[0119] The material of the second insulating member 129 may include but is not limited to rubber, silicone, or plastic.

[0120] The shape of the second insulating member 129 may include, but is not limited to, a straight shape, an L shape, a wavy shape, and the like.

[0121] In the above solution, the adapter 123 electrically connects the electrode terminal 124 and the electrode assembly 122, and radially seals the first pressing surface 1245 and the inner circumference of the recess 12101, thereby reducing the risk of separation between the electrode terminal 124 and the adapter 123. At least a portion of the second insulating member 129 is disposed between the inner surface of the first wall 1210 and the adapter 123, thereby reducing the risk of a short circuit between the adapter 123 and the inner surface of the first wall 1210, thereby improving the reliability of the battery cell 12.

[0122] According to some embodiments of the present application, please refer to Figures 3 to 7. The second insulating member 129 includes a second insulating member body 1291 and a second extension portion 1292. Along the thickness direction of the first wall 1210, the second insulating member body 1291 is arranged between the inner surface of the first wall 1210 and the adapter 123. In the radial direction of the electrode terminal 124, at least a portion of the second extension portion 1292 is located in the first through hole 12104.

[0123] The second insulating member body 1291 is disposed between the outer surface of the first wall 1210 and the adapter 123 , which means that the second insulating member body 1291 can insulate and isolate the adapter 123 from the first wall 1210 .

[0124] In the above solution, at least a portion of the second extension portion 1292 is located in the first through hole 12104 , which can reduce the risk of short circuit between the electrode terminal 124 and / or the adapter 123 and the hole wall of the first through hole 12104 , thereby facilitating improved reliability of the battery cell 12 .

[0125] According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , along the radial direction of the electrode terminal 124 , a second gap is defined between the second extension portion 1292 and the electrode terminal 124 .

[0126] In some embodiments, the portion of the electrode terminal 124 located in the first through hole 12104 will be welded to the adapter 123. The setting of the second gap can reduce the risk of heat accumulation during welding causing part of the second insulating member 129 to deform or even melt, resulting in insulation failure of the first insulating member 128.

[0127] In the above solution, the setting of the second gap can provide a certain assembly space for the electrode terminal 124 and / or the adapter 123, thereby reducing the risk of insulation failure of the second insulating member 129 due to damage to the second insulating member 129 during assembly.

[0128] According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , along the radial direction of the electrode terminal 124 , at least a portion of the second extension portion 1292 is located between the first extension portion 1282 and the electrode terminal 124 .

[0129] At least a portion of the second extension portion 1292 is located between the first extension portion 1282 and the electrode terminal 124 , which means that the first insulating member 128 and the second insulating member 129 can be positioned relative to each other after assembly.

[0130] In some embodiments, along the radial direction of the electrode terminal 124, projections of the first extension portion 1282 and the second extension portion 1292 at least partially overlap. In other embodiments, referring to FIG. 7 , along the radial direction of the electrode terminal 124, projections of the first extension portion 1282 and the second extension portion 1292 at least partially overlap, and the first extension portion 1282 and the second extension portion 1292 abut against each other.

[0131] In the above embodiment, at least a portion of second extension 1292 is located between first extension 1282 and electrode terminal 124. This allows second insulating member 129 and first insulating member 128 to constrain each other, reducing the risk of both shaking and enhancing structural stability. Furthermore, this further reduces the risk of shorting between electrode terminal 124 and / or adapter 123 and the wall of first through-hole 12104.

[0132] According to some embodiments of the present application, referring to Figures 3-7, the battery cell 12 further includes a connector 126 and a third insulating member 125. The connector 126 protrudes from the outer surface of the first wall 1210 and is disposed around the electrode terminal 124. The third insulating member 125 connects the electrode terminal 124 and the connector 126 to separate the connector 126 from the electrode terminal 124.

[0133] The connecting member 126 protrudes from the outer surface of the first wall 1210 and is disposed around the electrode terminal 124 , which means that the connecting member 126 is ring-shaped.

[0134] The cross section of the connecting member 126 may be L-shaped, Z-shaped, linear, wavy, etc.

[0135] The material of the connector 126 can be the same as or different from that of the first wall 1210. In embodiments where the material of the connector 126 is the same as that of the first wall 1210, the connector 126 and the first wall 1210 are connected by welding. This reduces the difficulty of welding the same materials and reduces the risk of weld defects. In other embodiments, the connector 126 can be integrally formed with the first wall 1210, for example, by casting, machining, or the like.

[0136] In some embodiments, the connector 126 may be connected to the first wall 1210 by bolting, clamping, or bonding.

[0137] The third insulating member 125 may be pre-formed and assembled between the connecting member 126 and the electrode terminal 124 , or may be formed between the connecting member 126 and the electrode terminal 124 by an injection molding process.

[0138] The material of the third insulating member 125 may include but is not limited to rubber, silicone or plastic.

[0139] The third insulating member 125 connects the connector 126 and the electrode terminal 124 and is used to separate the connector 126 from the electrode terminal 124. This means that the connector 126 can limit the position of the electrode terminal 124 by limiting the position of the third insulating member 125. This also means that the third insulating member 125 can be used to insulate and isolate the connector 126 from the electrode terminal 124.

[0140] In some embodiments, the third insulating member 125 is further provided with an anti-rotation structure that cooperates with the connecting member 126 and / or the electrode terminal 124 .

[0141] In the above solution, the electrode terminal 124 is clamped and secured by the connector 126 and the first wall 1210. The electrode terminal 124 is restrained at both ends of the thickness direction of the first wall 1210. This radial sealing significantly reduces the risk of separation between the electrode terminal 124 and the connected components. This also reduces the risk of insulation failure of the third insulating member 125 due to excessive reaction force on the electrode terminal 124. Furthermore, this reduces the risk of distortion of the connector 126 due to excessive reaction force on the electrode terminal 124, shaking of the electrode terminal 124, and unstable electrical connection of the battery cell 12.

[0142] According to some embodiments of the present application, please refer to Figures 3-7. In one or more embodiments of the first aspect, the first wall 1210 includes a main body 12102 and a convex portion 12103, the convex portion 12103 protrudes from the inner surface of the main body 12102, and the outer surface of the first wall 1210 forms a concave portion 12101 at a position corresponding to the convex portion 12103.

[0143] In some embodiments, the first wall 1210 is formed into a convex portion 12103 by stamping. After the stamping is completed, a concave portion 12101 may be formed at a position corresponding to the convex portion 12103.

[0144] The convex portion 12103 and the concave portion 12101 may also be formed by machining.

[0145] In the above solution, while forming the recess 12101 , the thickness of the first wall 1210 is reduced, thereby enabling the battery cell 12 to have a higher energy density and also helping to reduce the manufacturing cost of the battery cell 12 .

[0146] According to some embodiments of the present application, referring to FIG. 3 to FIG. 7 , the housing 121 includes a shell 1212 and an end cover 1211 . The shell 1212 has an opening, the end cover 1211 closes the opening, and the first wall 1210 serves as the end cover 1211 .

[0147] The first wall 1210 is an end cover 1211 , that is, the electrode terminal 124 and the sealing member 127 are both disposed on the end cover 1211 of the outer shell 121 .

[0148] In some embodiments, the first insulating member 128 is also disposed on the end cover 1211 .

[0149] In some embodiments, the second insulating member 129 is also disposed on the end cover 1211 .

[0150] In some embodiments, the third insulating member 125 is also disposed on the end cover 1211 .

[0151] In some embodiments, the connector 126 is also disposed on the end cap 1211 .

[0152] In the above solution, the first wall 1210 is the end cover 1211 , which helps to reduce the difficulty of assembling the electrode terminal 124 and the seal 127 to the housing 121 , thereby improving the production efficiency of the battery cell 12 .

[0153] According to some embodiments of the present application, the electrode terminal 124 is a copper-aluminum composite electrode terminal 124 .

[0154] Since the electrode terminal 124 is a copper-aluminum composite electrode terminal 124 , the electrode terminal 124 has a composite interface. When the electrode terminal 124 is subjected to external force or has internal stress, the risk of composite interface connection failure is high.

[0155] In the above solution, by reducing the reaction force on the electrode terminal 124 in the thickness direction of the first wall 1210 , the risk of composite interface separation of the electrode terminal 124 and resulting electrical connection failure of the battery cell 12 is reduced, which is beneficial to improving the service life of the electrode terminal 124 .

[0156] According to some embodiments of the present application, please refer to FIG. 2 . The present application provides a battery 100 , which includes the battery cell 12 in one or more of the above-mentioned embodiments.

[0157] In the above solution, since the battery cells 12 in one or more of the above embodiments have high reliability, the battery 100 including the battery cells 12 in the above embodiments also has high reliability.

[0158] According to some embodiments of the present application, please refer to Figure 1. The present application provides an electrical device, which includes the battery cell 12 in one or more of the above embodiments or the battery 100 in one or more of the above embodiments, and the battery cell 12 or the battery 100 is used to provide electrical energy.

[0159] In the above scheme, since the battery cell 12 in the above one or more embodiments has higher reliability, the electrical equipment including the battery cell 12 in the above one or more embodiments also has higher reliability; or, since the battery 100 in the above one or more embodiments has higher reliability, the electrical equipment including the battery 100 in the above one or more embodiments also has higher reliability.

[0160] According to some embodiments of the present application, with reference to FIG3-FIG7 , the present application provides a battery cell 12, which includes a housing 121, an electrode terminal 124, a sealing member 127, a first insulating member 128, a second insulating member 129, a third insulating member 125, a connector 126, an electrode assembly 122, and a transition member 123. The electrode assembly 122 is disposed within the housing 121, and the transition member 123 electrically connects the electrode terminal 124 and the electrode assembly 122. The housing 121 includes a first wall 1210, the outer surface of which is provided with a recessed portion 12101 that is recessed along the thickness direction of the first wall 1210. The outer shell 121 includes a shell 1212 and an end cap 1211. The shell 1212 has an opening, which is sealed by the end cap 1211. The first wall 1210 includes a body 12102 and a protrusion 12103. The protrusion 12103 protrudes from the inner surface of the body 12102. The outer surface of the first wall 1210 forms a recess 12101 at a position corresponding to the protrusion 12103. The bottom surface of the recess 12101 is provided with a first through-hole 12104. At least a portion of the electrode terminal 124 is disposed within the first through-hole 12104. The connector 126 protrudes from the outer surface of the first wall 1210 and surrounds the electrode terminal 124. The third insulating member 125 connects the electrode terminal 124 and the connector 126, separating the connector 126 from the electrode terminal 124. The first wall 1210 is the end cap 1211, and the electrode terminal 124 is a copper-aluminum composite electrode terminal 124.

[0161] A portion of the electrode terminal 124 is housed within the recess 12101. The outer circumferential surface of the electrode terminal 124 includes a first pressing surface 1245. Along the radial direction of the electrode terminal 124, at least a portion of the seal 127 is positioned between the first pressing surface 1245 and the inner circumferential surface of the recess 12101. The first pressing surface 1245 and the inner circumferential surface of the recess 12101 jointly clamp the seal 127. The angle between the inner circumferential surface of the recess 12101 and the bottom surface of the recess 12101 is a first obtuse angle. The electrode terminal 124 has a second pressing surface 1246. Along the thickness direction of the first wall 1210, the second pressing surface 1246 and the bottom surface of the recess 12101 are opposed to each other. The first pressing surface 1245 connects to the second pressing surface 1246, and the angle between the first pressing surface 1245 and the second pressing surface 1246 is a second obtuse angle.

[0162] The first insulating member 128 includes a first insulating member body 1281 and a first extension 1282. Along the thickness direction of the first wall 1210, the first insulating member body 1281 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246. At least a portion of the first extension 1282 is located within the first through-hole 12104. The second insulating member 129 includes a second insulating member body 1291 and a second extension 1292. Along the thickness direction of the first wall 1210, the second insulating member body 1291 is disposed between the inner surface of the first wall 1210 and the adapter 123. In the radial direction of the electrode terminal 124, at least a portion of the second extension 1292 is located within the first through-hole 12104.

[0163] Along the radial direction of electrode terminal 124 , a first gap is defined between first extension portion 1282 and electrode terminal 124 . A second gap is defined between second extension portion 1292 and electrode terminal 124 . At least a portion of second extension portion 1292 is located between first extension portion 1282 and electrode terminal 124 .

[0164] The seal 127 seals the gap between the first clamping surface 1245 and the inner circumferential surface of the recess 12101 along the radial direction of the electrode terminal 124, so that the reaction force generated by the compressed seal 127 acting on the electrode terminal 124 along the thickness direction of the first wall 1210 is relatively small, thereby making the risk of the components connected to the electrode terminal 124 separating from the electrode terminal 124 relatively low, which is beneficial to making the battery cell 12 have higher conductive stability, and further beneficial to improving the reliability of the battery cell 12.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing includes a first wall, wherein an outer surface of the first wall is provided with a recessed portion recessed along a thickness direction of the first wall; an electrode terminal, a portion of which is accommodated in the recess; In which, the outer peripheral surface of the electrode terminal includes a first pressing surface, and the battery cell also includes a seal. Along the radial direction of the electrode terminal, at least a portion of the seal is arranged between the first pressing surface and the inner peripheral surface of the recess, and the first pressing surface and the inner peripheral surface of the recess jointly clamp the seal.

2. The battery cell according to claim 1, wherein: An included angle between an inner peripheral surface of the recess and a bottom surface of the recess is a first obtuse angle.

3. The battery cell according to claim 1 or 2, characterized in that: The electrode terminal has a second pressing surface. Along the thickness direction of the first wall, the second pressing surface and the bottom surface of the recess are arranged opposite to each other. The first pressing surface is connected to the second pressing surface. The angle between the first pressing surface and the second pressing surface is a second obtuse angle.

4. The battery cell according to claim 3, characterized in that The battery cell further includes a first insulating member. Along a thickness direction of the first wall, at least a portion of the first insulating member is located between the second pressing surface and a bottom surface of the recess.

5. The battery cell according to claim 4, characterized in that A first through hole is provided on the bottom surface of the recess, and at least a portion of the electrode terminal is provided in the first through hole; The first insulating member includes a first insulating member body and a first extension portion. Along the thickness direction of the first wall, the first insulating member body is arranged between the outer surface of the first wall and the second pressing surface, and at least a portion of the first extension portion is located in the first through hole.

6. The battery cell according to claim 5, characterized in that A first gap is defined between the first extension portion and the electrode terminal along a radial direction of the electrode terminal.

7. The battery cell according to claim 5 or 6, characterized in that: The battery cell further includes a switching element and an electrode assembly, wherein the electrode assembly is disposed in the housing, and the switching element electrically connects the electrode terminal and the electrode assembly; The battery cell further includes a second insulating member. Along a thickness direction of the first wall, at least a portion of the second insulating member is disposed between an inner surface of the first wall and the adapter.

8. The battery cell according to claim 7, characterized in that The second insulating member includes a second insulating member body and a second extension portion. Along the thickness direction of the first wall, the second insulating member body is arranged between the inner surface of the first wall and the adapter. In the radial direction of the electrode terminal, at least a portion of the second extension portion is located in the first through hole.

9. The battery cell according to claim 8, characterized in that A second gap is defined between the second extension portion and the electrode terminal along a radial direction of the electrode terminal.

10. The battery cell according to claim 8 or 9, characterized in that: In a radial direction of the electrode terminal, at least a portion of the second extension portion is located between the first extension portion and the electrode terminal.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The battery cell further comprises: a connecting member protruding from an outer surface of the first wall and disposed around the electrode terminal; The third insulating member connects the electrode terminal and the connecting member and is used to separate the connecting member from the electrode terminal.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The first wall includes a main body and a convex portion. The convex portion protrudes from an inner surface of the main body. The outer surface of the first wall forms the concave portion at a position corresponding to the convex portion.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The housing includes a shell and an end cover, the shell has an opening, the end cover closes the opening, and the first wall serves as the end cover.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The electrode terminal is a copper-aluminum composite electrode terminal.

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

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

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