Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment, and belongs to the technical field of batteries. The battery cell includes a case including a first wall, an electrode terminal, and a seal, an outer surface of the first wall being provided with a recess recessed in a thickness direction of the first wall. A portion of the electrode terminal is accommodated in the recess. Wherein the outer circumferential surface of the electrode terminal comprises a first pressing surface, at least one part of the sealing element is arranged between the first pressing surface and the inner circumferential surface of the concave part in the radial direction of the electrode terminal, and the first pressing surface and the inner circumferential surface of the concave part jointly clamp the sealing element. The battery monomer has relatively high reliability.

Description

Technical Field

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

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

[0003] How to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Utility Model Content

[0004] 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.

[0005] In the first aspect, the present application provides a battery cell, the battery cell comprising a housing, an electrode terminal and a seal, the housing comprising a first wall, the outer surface of the first wall being 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 comprises a first clamping surface, and along the radial direction of the electrode terminal, at least a portion of the seal is disposed between the first clamping surface and the inner peripheral surface of the recess, and the first clamping surface and the inner peripheral surface of the recess jointly clamp the seal.

[0006] In the technical solution of the embodiment of the present application, the seal seals the gap between the first clamping 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.

[0007] 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.

[0008] 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.

[0009] In one or more embodiments of the first aspect, the electrode terminal has a second clamping surface, and along the thickness direction of the first wall, the second clamping surface and the bottom surface of the recess are arranged opposite to each other, the first clamping surface is connected to the second clamping surface, and the angle between the first clamping surface and the second clamping surface is a second obtuse angle.

[0010] In the above solution, the included angle between the first pressing surface and the second pressing surface is a second obtuse angle, which can further reduce the difficulty of assembling the first sealing member.

[0011] 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.

[0012] In the above solution, the provision of the first insulating member can reduce the wind direction of the 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.

[0013] 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 in the first through hole. The first insulating member includes a first insulating member body and a first extension portion, and 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 portion is located in the first through hole.

[0014] 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 improving the reliability of the battery cell.

[0015] In one or more embodiments of the first aspect, along the radial direction of the electrode terminal, a first gap is provided between the first extension portion and the electrode terminal.

[0016] In the above solution, the setting 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.

[0017] In one or more embodiments of the first aspect, the battery cell further comprises a transition piece and an electrode assembly, the electrode assembly is disposed in the housing, and the transition piece electrically connects the electrode terminal and the electrode assembly. The battery cell further comprises a second insulating piece, and along the thickness direction of the first wall, at least a portion of the second insulating piece is disposed between the inner surface of the first wall and the transition piece.

[0018] In the above solution, the adapter electrically connects the electrode terminal and the electrode assembly, and the first pressing surface and the inner circumference of the recess are sealed in a radial sealing manner, which is conducive to reducing the risk of separation of the electrode terminal and the adapter. At least a portion of the second insulating member is arranged between the inner surface of the first wall and the adapter, which can reduce the wind direction of the short circuit between the adapter and the inner surface of the first wall, thereby helping to improve the reliability of the battery cell.

[0019] 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.

[0020] 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 improving the reliability of the battery cell.

[0021] In one or more embodiments of the first aspect, along the radial direction of the electrode terminal, a second gap is provided between the second extension portion and the electrode terminal.

[0022] In the above solution, 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.

[0023] In one or more embodiments of the first aspect, along the 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.

[0024] In the above solution, at least part of the second extension portion is located between the first extension portion and the electrode terminal. On the one hand, the second insulating member and the first insulating member can constrain each other, the risk of shaking of the two is low, and the structural stability is strong. On the other hand, the risk of short circuit between the electrode terminal and / or the adapter and the hole wall of the first through hole can be further reduced.

[0025] In one or more embodiments of the first aspect, the battery cell further comprises a connector and a third insulating member, the connector protruding from the outer surface of the first wall and arranged around the electrode terminal. The third insulating member connects the electrode terminal and the connector to separate the connector and the electrode terminal.

[0026] In the above solution, the electrode terminal is clamped and fixed by the connector and the first wall, and both ends of the electrode terminal in the thickness direction of the first wall are limited. The risk of separation of the electrode terminal and the parts connected thereto can be significantly reduced by radial sealing. At the same time, the risk of insulation failure of the third insulating member due to excessive reaction force on the electrode terminal can also be reduced. In addition, the risk of distortion and deformation of the connector, shaking of the electrode terminal, and unstable electrical connection of the battery cell due to excessive reaction force on the electrode terminal can also be reduced.

[0027] 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 an inner surface of the main body, and an outer surface of the first wall forms a concave portion at a position corresponding to the convex portion.

[0028] In the above solution, while forming the recess, it is helpful to reduce the thickness of the first wall, so that the battery cell has a higher energy density and also helps to reduce the manufacturing cost of the battery cell.

[0029] 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.

[0030] In the above solution, the first wall is an end cover, which is conducive to reducing the difficulty of assembling the electrode terminal and the sealing member to the outer shell, thereby improving the production efficiency of the battery cell.

[0031] In one or more embodiments of the first aspect, the electrode terminal is a copper-aluminum composite electrode terminal.

[0032] In the above solution, by reducing the reaction force on the electrode terminal in the thickness direction of the first wall, the risk of composite interface separation of the electrode terminal and resulting in electrical connection failure of the battery cell is reduced, which is beneficial to increasing the service life of the electrode terminal.

[0033] In a second aspect, the present application provides a battery, comprising a battery cell according to one or more embodiments of the first aspect.

[0034] 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.

[0035] In a third aspect, the present application provides an electrical device, which includes a battery cell in one or more embodiments of the first aspect or a battery in one or more embodiments of the second aspect, and the battery cell or the battery is used to provide electrical energy.

[0036] 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

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0038] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0039] Figure 2 An exploded view of a battery according to some embodiments of the present application;

[0040] Figure 3 An exploded view of a battery cell according to some embodiments of the present application;

[0041] Figure 4 A cross-sectional view of a battery cell according to some embodiments of the present application;

[0042] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0043] Figure 6 A cross-sectional view of a portion of a battery cell according to some embodiments of the present application;

[0044] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0045] Figure 8 It is a cross-sectional view of a part of the structure of a battery cell according to some other embodiments of the present application.

[0046] The reference numerals in the specific implementation manner are as follows:

[0047] 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

[0048] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] 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).

[0053] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] In the present 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 a cylinder, a flat body, a rectangular parallelepiped or other shapes, etc. The battery cell may include but is not limited to a cylindrical battery cell, a square battery cell, a soft-pack battery cell and a blade battery cell according to the packaging method.

[0056] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules 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 including 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 common battery cell structure, the battery cell includes a shell, an electrode assembly and an electrolyte. The shell includes an end cap and a shell, and the end cap closes the opening of the shell to define a storage space for accommodating the electrode assembly.

[0057] 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. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode 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 collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to pass a large 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 a winding type or a lamination type.

[0058] The tab generally leads the electric energy of the electrode assembly by being electrically connected to the conductive member. In some cases, the conductive member is a connector connecting the tab and the electrode terminal, and in some other cases, the conductive member is the electrode terminal. The electrode terminal generally includes a positive electrode terminal and a negative electrode terminal. For a rectangular battery cell, the electrode terminal is generally provided in the end cap portion. In some other cases, the electrode terminal may also be provided in the housing portion. Multiple battery cells are connected in series and / or in parallel via the electrode terminals for various applications.

[0059] The development of battery technology must take into account many 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.

[0060] The electrode terminals of a typical battery cell are inserted through the wall of the shell along the thickness direction of the wall of the shell. The electrode terminals along the thickness direction of the wall of the shell generally lead out the electric energy inside the battery cell by electrically connecting other components. The seals of a typical battery cell are arranged along the thickness direction of the wall of the shell, that is, the battery cell is sealed in an axial sealing manner. After assembly, the seals will be compressed by the electrode terminals. At this time, the reaction force of the seals on the electrode terminals along the thickness direction of the wall of the shell is large, the risk of separation of the electrode terminals and the components electrically connected to them is high, and the reliability of the battery cell is low.

[0061] In view of this, the present application provides a battery cell, which includes a shell, an electrode terminal and a seal, wherein the shell includes a first wall, and 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. Among them, 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 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 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, so that the risk of separation of the components connected to the electrode terminal from the electrode terminal is 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.

[0062] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0063] 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.

[0064] 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.

[0065] For example, Figure 1 The schematic diagram of the structure of the vehicle 1000 of some embodiments of the present application, the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The motor 300, the controller 200 and the battery 100 can be arranged inside the vehicle 1000, and the controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 can be arranged at the bottom or the front or the rear of the vehicle 1000. The battery 100 can be used for powering the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during startup, navigation and operation. In another embodiment of the present application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] In order to meet different power requirements, the battery 100 may include a plurality of battery cells 12, wherein the plurality of battery cells 12 may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, a plurality of battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and a plurality of battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, a plurality of battery cells 12 may directly form the battery 100, or they may first form a battery module, and then the battery module may form the battery 100.

[0067] For example, see Figure 2 , Figure 2 1 is an exploded view of a battery 100 in 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. The interior of the housing 11 is a hollow structure. The plurality of battery cells 12 are accommodated in the housing 11. Figure 2As shown, they are respectively referred to as the first box body 111 and the second box body 112, and the first box body 111 and the second box body 112 are buckled together. The shapes of the first box body 111 and the second box body 112 can be determined according to the shapes of the combination of multiple battery cells 12, and the first box body 111 and the second box body 112 can both have an opening. For example, the first box body 111 and the second box body 112 can both be hollow rectangular parallelepipeds and each has only one open face, the open face of the first box body 111 and the open face of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 11 with a closed chamber. Multiple battery cells 12 are connected in parallel or in series or in mixed connection and are placed in the box body 11 formed by the buckling of the first box body 111 and the second box body 112.

[0068] Optionally, the battery 100 may also include other structures, which are not described one by one here. For example, the battery 100 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between 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 multiple battery cells 12 can be further led out through the box body 11 through a conductive mechanism.

[0069] According to different power requirements, the number of battery cells 12 can be set to any value. Multiple battery cells 12 can be connected in series, parallel or hybrid 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 the battery module is not limited and can be set according to demand. The battery 100 may include multiple battery modules, which can be connected in series, parallel or hybrid.

[0070] Please refer to Figure 3 As shown, Figure 3 This is an exploded view of a battery cell 12 of some embodiments of the present application, and the battery cell 12 includes one or more electrode assemblies 122 and a shell 121. The shell 121 may include a shell 1212, and multiple walls of the shell 1212, that is, multiple walls of the shell 121, form a cavity, and this cavity can be used to accommodate the electrode assembly 122. The shell 1212 is determined according to the shape of the one or more electrode assemblies 122 after being combined. For example, the shell 1212 can be a hollow cuboid or a cube or a regular polyhedron, and one of the faces of the shell 1212 has an opening so that 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.

[0071] The battery cell 12 may also include two electrode terminals 124, which may be disposed 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 on 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, according to actual use requirements, the electrode assembly 122 may be provided as a single one, or as a plurality of ones, and a plurality of independent electrode assemblies 122 are provided in the battery cell 12.

[0072] According to some embodiments of this application, please refer to Figure 3-Figure 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, and the outer surface of the first wall 1210 is provided with a recess 12101 that is recessed along the thickness direction of the first wall 1210. 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, and 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 peripheral surface of the recess 12101, and the first pressing surface 1245 and the inner peripheral surface of the recess 12101 clamp the seal 127 together.

[0073] 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 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.

[0074] 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 .

[0075] 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.

[0076] The housing 121 may be in various shapes, such as a cylinder, a cuboid, etc. The shape of the housing 121 may be determined according to the specific shape of the electrode assembly 122. For example, if the electrode assembly 122 is a cylindrical structure, the housing 121 may be a cylindrical structure; if the electrode assembly 122 is a cuboid structure, the housing 121 may be a cuboid structure.

[0077] In some embodiments, the housing 121 may include a shell 1212 and two end caps 1211, wherein the shell 1212 is a hollow structure with openings on opposite sides, and one end cap 1211 corresponds to covering an opening of the shell 1212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 122 and the electrolyte.

[0078] The first wall 1210 may be an end cover 1211 , or may be any wall portion of the housing 1212 .

[0079] The housing 121 generally has a receiving cavity inside, and the receiving cavity 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.

[0080] 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, so as to realize the input or output of electrical energy of the battery cell 12.

[0081] Optionally, the electrode terminal 124 may be directly connected to the tab of the electrode assembly 122, such as by welding or abutment, or may 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 may be various, such as welding, abutment or clamping.

[0082] In some embodiments, the electrode terminal 124 may be electrically connected to the tab of the electrode assembly 122 via the adapter 123 .

[0083] 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 other embodiments, the risk of separation of the electrode terminal 124 from the tab is small.

[0084] In some embodiments, the electrode terminal 124 is a copper-aluminum composite electrode terminal 124. The copper-aluminum composite electrode terminal 124 can make the electrode terminal 124 have both excellent conductivity and chemical stability. However, due to the differences in physical properties of copper and aluminum, such as thermal expansion coefficient and elastic modulus, the risk of composite interface separation is high under the action of external force. If the force applied to the electrode terminal 124 in the thickness direction of the first wall 1210 is small, the risk of composite interface separation can be reduced.

[0085] The material of the sealing member 127 may include but is not limited to rubber, polyurethane, polytetrafluoroethylene, etc.

[0086] 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 circumference of the recess 12101. The first pressing surface 1245 and the inner circumference of the recess 12101 clamp the seal 127 together, which means that the seal 127 will deform to a certain extent after assembly, 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 circumference of the recess 12101. That is, the reaction force of the seal 127 on the electrode terminal 124 is along the radial direction of the electrode terminal 124.

[0087] In some embodiments, the first pressing surface 1245 and / or the inner circumferential surface of the recess 12101 may be inclined relative to the first wall 1210 .

[0088] In some embodiments, please refer to Figure 8 The outer surface of the first wall 1210 is provided with an annular flange, and the inner peripheral side of the annular flange forms a recessed portion 12101.

[0089] The recess 12101 may be formed by machining, or by punching the first wall 1210 to form the protrusion 12103 .

[0090] 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.

[0091] According to some embodiments of this application, please refer to Figure 3-Figure 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.

[0092] The angle between the inner circumference of the recess 12101 and the bottom of the recess 12101 is a first obtuse angle, which means that the inner circumference of the recess 12101 can guide the seal 127 when it is assembled, thereby reducing the difficulty of assembly. After assembly, it is easier to deform the seal 127 to press against the first pressing surface 1245 and the inner circumference of the recess 12101.

[0093] In the above solution, the angle between the inner circumferential surface of the recess 12101 and the bottom surface of the recess 12101 is a first obtuse angle, which can reduce the force exerted on the electrode terminal 124 in the thickness direction of the first wall 1210 and reduce the difficulty of assembling the seal 127 .

[0094] According to some embodiments of this application, please refer to Figure 3-Figure 7 The electrode terminal 124 has a second clamping surface 1246. Along the thickness direction of the first wall 1210, the second clamping surface 1246 and the bottom surface of the recess 12101 are arranged opposite to each other. The first clamping surface 1245 is connected to the second clamping surface 1246. The angle between the first clamping surface 1245 and the second clamping surface 1246 is a second obtuse angle.

[0095] 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 when it is assembled, thereby reducing the difficulty of assembly. After assembly, it is easier to deform the first seal 127 to press against the first pressing surface 1245 and the inner circumference of the recess 12101.

[0096] 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 .

[0097] According to some embodiments of this application, please refer to Figure 3-Figure 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 .

[0098] 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 .

[0099] The material of the first insulating member 128 may include but is not limited to rubber, silicone or plastic.

[0100] The shape of the first insulating member 128 may include, but is not limited to, a straight shape, an L shape, a wavy shape, etc.

[0101] In the above solution, the provision of the first insulating member 128 can reduce the wind direction of the 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 .

[0102] According to some embodiments of this application, please refer to Figure 3-Figure 7 The bottom surface of the recess 12101 is provided with a first through hole 12104, and at least a portion of the electrode terminal 124 is disposed in 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 in the first through hole 12104.

[0103] 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.

[0104] 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 and the first wall 1210 .

[0105] 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 .

[0106] 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 risk of short circuit between the electrode terminal 124 and the hole wall of the first through hole 12104 , thereby facilitating improving the reliability of the battery cell 12 .

[0107] According to some embodiments of this application, please refer to Figure 3-Figure 7 , along the radial direction of the electrode terminal 124 , there is a first gap between the first extension portion 1282 and the electrode terminal 124 .

[0108] 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 deformation or even melting of part of the first insulating member 128, resulting in insulation failure of the first insulating member 128.

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

[0110] In the above solution, the setting 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.

[0111] According to some embodiments of this application, please refer to Figure 3-Figure 7 The battery cell 12 further includes a transition piece 123 and an electrode assembly 122, wherein the electrode assembly 122 is disposed in the housing 121, and the transition piece 123 electrically connects the electrode terminal 124 and the electrode assembly 122. The battery cell 12 further includes a second insulating piece 129, wherein at least a portion of the second insulating piece 129 is disposed between the inner surface of the first wall 1210 and the transition piece 123 along the thickness direction of the first wall 1210.

[0112] The material of the adapter 123 can be the same as or different from the material of the electrode terminal 124 .

[0113] 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.

[0114] 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 .

[0115] In some embodiments, the adapter 123 is a sheet metal structure.

[0116] The adapter 123 may be a flat plate structure, or a structure with a protrusion or a recess 12101. For example, the cross-sectional shape of the adapter 123 may be L-shaped, Z-shaped, or an X-shaped.

[0117] 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 , which means that the second insulating member 129 can be used to insulate and isolate the first wall 1210 and the adapter 123 .

[0118] The material of the second insulating member 129 may include but is not limited to rubber, silicone or plastic.

[0119] The shape of the second insulating member 129 may include but is not limited to a straight shape, an L shape, a wavy shape, etc.

[0120] In the above solution, the adapter 123 electrically connects the electrode terminal 124 and the electrode assembly 122, and seals the first pressing surface 1245 and the inner circumference of the recess 12101 in a radial sealing manner, which is conducive to reducing the risk of separation of 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 can reduce the wind direction of the short circuit between the adapter 123 and the inner surface of the first wall 1210, thereby helping to improve the reliability of the battery cell 12.

[0121] According to some embodiments of this application, please refer to Figure 3-Figure 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.

[0122] 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 and the first wall 1210 .

[0123] 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 improving the reliability of the battery cell 12 .

[0124] According to some embodiments of this application, please refer to Figure 3-Figure 7 , along the radial direction of the electrode terminal 124 , a second gap is provided between the second extension portion 1292 and the electrode terminal 124 .

[0125] 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 deformation or even melting of part of the second insulating member 129 and resulting in insulation failure of the first insulating member 128.

[0126] 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.

[0127] According to some embodiments of this application, please refer to Figure 3-Figure 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 .

[0128] 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 limit each other after assembly.

[0129] In some embodiments, 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. Figure 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.

[0130] In the above solution, at least part of the second extension part 1292 is located between the first extension part 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, and the risk of shaking of the two is low, and the structural stability is strong. On the other hand, 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 can be further reduced.

[0131] According to some embodiments of this application, please refer to Figure 3-Figure 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 surrounds the electrode terminal 124. The third insulating member 125 connects the electrode terminal 124 and the connector 126 to separate the connector 126 and the electrode terminal 124.

[0132] 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.

[0133] The cross section of the connecting member 126 may be L-shaped, Z-shaped, linear, wavy, etc.

[0134] The material of the connector 126 may be the same as or different from the material of the first wall 1210. In the embodiment where the material of the connector 126 is the same as the material of the first wall 1210, the connector 126 and the first wall 1210 are connected by welding, and the difficulty of welding the same material is low, and the risk of defects in the formed weld is low. In other embodiments, the connector 126 and the first wall 1210 may be integrally formed, for example, by casting, machining, etc.

[0135] In some embodiments, the connection member 126 can be connected to the first wall 1210 by bolt connection, clamping or bonding.

[0136] The third insulating member 125 can be pre-processed and assembled between the connecting member 126 and the electrode terminal 124 , or can be formed between the connecting member 126 and the electrode terminal 124 by an injection molding process.

[0137] The material of the third insulating member 125 may include but is not limited to rubber, silicone or plastic.

[0138] 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 connecting 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 connecting member 126 and the electrode terminal 124.

[0139] 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 .

[0140] In the above solution, the electrode terminal 124 is clamped and fixed by the connector 126 and the first wall 1210. Both ends of the electrode terminal 124 in the thickness direction of the first wall 1210 are limited. The risk of separation of the electrode terminal 124 and the parts connected thereto can be significantly reduced by radial sealing. At the same time, the risk of insulation failure of the third insulating member 125 due to excessive reaction force on the electrode terminal 124 can also be reduced. In addition, the risk of distortion and deformation 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 can also be reduced.

[0141] According to some embodiments of this application, please refer to Figure 3-Figure 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.

[0142] In some embodiments, the first wall 1210 is formed with a protrusion 12103 by stamping, and after the stamping is completed, a concave portion 12101 may be formed at a position corresponding to the protrusion 12103 .

[0143] The protrusion 12103 and the recess 12101 may also be formed by machining.

[0144] In the above solution, while forming the recess 12101 , it is helpful to reduce the wall thickness of the first wall 1210 , so that the battery cell 12 has a higher energy density and is also helpful to reduce the manufacturing cost of the battery cell 12 .

[0145] According to some embodiments of this application, please refer to Figure 3-Figure 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 is the end cover 1211 .

[0146] 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 housing 121 .

[0147] In some embodiments, the first insulating member 128 is also disposed on the end cover 1211 .

[0148] In some embodiments, the second insulating member 129 is also disposed on the end cover 1211 .

[0149] In some embodiments, the third insulating member 125 is also disposed on the end cover 1211 .

[0150] In some embodiments, the connector 126 is also disposed on the end cover 1211 .

[0151] In the above solution, the first wall 1210 is the end cover 1211 , which is helpful to reduce the difficulty of assembling the electrode terminal 124 and the seal 127 to the housing 121 , so as to improve the production efficiency of the battery cell 12 .

[0152] According to some embodiments of the present application, the electrode terminal 124 is a copper-aluminum composite electrode terminal 124 .

[0153] 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.

[0154] 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 in electrical connection failure of the battery cell 12 is reduced, which is beneficial to improving the service life of the electrode terminal 124 .

[0155] According to some embodiments of this application, please refer to Figure 2 The present application provides a battery 100, and the battery 100 includes the battery cell 12 in one or more of the above-mentioned embodiments.

[0156] 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.

[0157] According to some embodiments of this application, please refer to Figure 1The 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.

[0158] 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.

[0159] According to some embodiments of the present application, referring to Figure 3-Figure 7 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 connecting member 126, an electrode assembly 122, and a transition member 123. The electrode assembly 122 is disposed in 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, and a recess 12101 is provided on the outer surface of the first wall 1210 along the thickness direction of the first wall 1210. The housing 121 includes a shell 1212 and an end cap 1211. The shell 1212 has an opening, and the end cap 1211 closes the opening. The first wall 1210 includes a body 12102 and a convex portion 12103. The convex portion 12103 protrudes from the inner surface of the body 12102. The outer surface of the first wall 1210 forms a concave portion 12101 at a position corresponding to the convex portion 12103. The bottom surface of the concave portion 12101 is provided with a first through hole 12104. At least part of the electrode terminal 124 is provided in the first through hole 12104. The connecting member 126 protrudes from the outer surface of the first wall 1210 and is provided around the electrode terminal 124. The third insulating member 125 connects the electrode terminal 124 and the connecting member 126, and is used to separate the connecting member 126 and the electrode terminal 124. Among them, the first wall 1210 is the end cap 1211, and the electrode terminal 124 is a copper-aluminum composite electrode terminal 124.

[0160] 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 the electrode terminal 124, at least a portion of the seal 127 is disposed between the first pressing surface 1245 and the inner peripheral surface of the recess 12101. The first pressing surface 1245 and the inner peripheral surface of the recess 12101 clamp the seal 127 together. The angle between the inner peripheral 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 disposed opposite to each other. 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.

[0161] The first insulating member 128 includes a first insulating member body 1281 and a first extension 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 in 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, 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.

[0162] 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 . A second gap is formed 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 .

[0163] 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.

[0164] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 comprises 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; Among them, the outer circumferential surface of the electrode terminal includes a first clamping 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 clamping surface and the inner circumferential surface of the recess, and the first clamping surface and the inner circumferential surface of the recess jointly clamp the seal.

2. The battery cell according to claim 1, characterized in that: 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, 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, 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 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 extending 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 extending 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, 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, 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 claim 1, characterized in that: The battery cell further comprises: A connecting member, the connecting member protrudes from the outer surface of the first wall and is arranged around the electrode terminal; A third insulating member connects the electrode terminal and the connecting member and is used to separate the connecting member and the electrode terminal.

12. The battery cell according to claim 1, 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, and 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 claim 1, characterized in that: The housing comprises 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.

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 a battery cell as claimed in any one of claims 1 to 14.

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

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