Battery cell, battery, and electric device

Abstract

A battery cell (12), a battery (100), and an electric device, relating to the technical field of batteries. The battery cell (12) comprises a casing (121), an electrode terminal (124), a connecting member (126), and a first insulating member (125). The casing (121) comprises a first wall (1210); and the first wall (1210) is provided with a first through hole. The electrode terminal (124) covers the first through hole. The connecting member (126) protrudes from the outer surface of the first wall (1210) and is arranged around the electrode terminal (124). The first insulating member (125) connects the connecting member (126) and the electrode terminal (124), and is used for separating the connecting member (126) from the electrode terminal (124). The connecting member (126) is provided with a first limiting portion (1261), the first insulating member (125) is provided with a second limiting portion (1251), the first limiting portion (1261) cooperates with the second limiting portion (1251) to limit the circumferential rotation of the first insulating member (125) relative to the connecting member (126), and the projection of the first limiting portion (1261) and / or the second limiting portion (1251) at least partially overlaps with the projection of the electrode terminal (124). The battery cell (12) has relatively high reliability.

Description

Battery cells, batteries and electrical equipment 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 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.

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

[0004] 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, which includes a shell, an electrode terminal, a connector and a first insulating member, wherein the shell includes a first wall, and the first wall is provided with a first through hole. The electrode terminal covers the first through hole. The connector protrudes from the outer surface of the first wall and is arranged around the electrode terminal. The first insulating member connects the connector and the electrode terminal and is used to separate the connector and the electrode terminal. The connector is provided with a first limiting portion, and the first insulating member is provided with a second limiting portion. The first limiting portion cooperates with the second limiting portion to limit the circumferential rotation of the first insulating member relative to the connector, and the projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal.

[0007] In the technical solution of the embodiment of the present application, since the projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal, the distance between the connection position of the connector and the first wall and the electrode terminal is relatively short. After the electrode terminal is subjected to force, the force arm of the force acting on the first wall is shorter, and the force applied to the first wall is smaller, so that the first wall has a higher strength, which is beneficial to improving the reliability of the battery cell.

[0008] In one or more embodiments of the first aspect, the first limiting portion is provided on the inner circumferential surface of the connecting member.

[0009] In the above solution, on the one hand, the processing of the first limiting portion is more convenient and the processing difficulty is reduced; on the other hand, the difficulty of matching the connecting member and the first insulating member can be reduced.

[0010] In one or more embodiments of the first aspect, the first limiting portion is a first groove, the second limiting portion is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

[0011] In the above solution, the anti-rotation structure is formed by engaging the first groove and the first protrusion, which has the advantages of low processing difficulty and low matching difficulty.

[0012] In one or more embodiments of the first aspect, the connector includes a first connector, a second connector, and a third connector. The first connector is connected to the first wall. The second connector is located on the inner circumference of the first connector and, along the thickness of the first wall, is further away from the interior of the housing than the first connector. The third connector connects the first and second connectors. The first stop is provided on the inner circumference of the second connector.

[0013] In the above solution, the second connecting portion is located on the inner circumference of the first connecting portion, resulting in a Z-shaped cross-section of the connector. This helps disperse stress within the connector and improves its strength. The first limiting portion is located on the inner circumference of the second connecting portion. This reduces the difficulty of assembling the connector with the first wall while also bringing the first limiting portion closer to the first insulating member, improving its anti-rotation effect on the first insulating member. Furthermore, it brings the second connecting portion closer to the electrode terminal, improving the connector's ability to limit the electrode terminal.

[0014] In one or more embodiments of the first aspect, the first insulating member is provided with a third limiting portion, and the electrode terminal is provided with a fourth limiting portion, and the third limiting portion cooperates with the fourth limiting portion to limit the circumferential rotation of the electrode terminal relative to the first insulating member.

[0015] In the above solution, by providing a third limiting portion and a fourth limiting portion that cooperate with each other, the electrode terminal can be restricted from rotating relative to the first insulating member, which is beneficial to improving the structural stability of the battery cell and reducing the difficulty of assembling the connector, the first insulating member and the electrode terminal.

[0016] In one or more embodiments of the first aspect, along the radial direction of the electrode terminal, a projection of the third limiting portion at least partially overlaps with a projection of the second limiting portion.

[0017] In the above solution, the projection of the third stopper at least partially overlaps with the projection of the second stopper along the radial direction of the electrode terminal. This allows the second and third stoppers to share some space in the thickness direction of the first wall, which helps improve the energy density of the battery cell. Furthermore, when the first insulating member is subjected to force, the risk of distortion is reduced, improving its ability to withstand external forces or internal stresses and enhancing its structural stability. Furthermore, this facilitates pre-alignment of the connector, first insulating member, and electrode terminal during assembly, reducing the difficulty of assembly.

[0018] In one or more embodiments of the first aspect, the electrode terminal includes a first part and a second part. Along the thickness direction of the first wall, the first part is located between the first wall and the connecting member, and the second part is located on the side of the first part away from the interior of the battery cell. The diameter of the second part is smaller than the diameter of the first part, and the fourth limiting portion is arranged on the outer peripheral surface of the second part.

[0019] In the above solution, because the diameter of the second portion is smaller than that of the first portion, the space occupied by the electrode terminal assembly can be reduced. This helps stabilize the electrode terminal assembly while further shortening the distance between the electrode terminal, the connector, and the first wall. This also helps further shorten the force arm acting on the first wall when the electrode terminal is subjected to force, thereby increasing the strength of the first wall. It also increases the contact area between the electrode terminal and the first insulating member, improving the insulation effect of the first insulating member on the electrode terminal.

[0020] In one or more embodiments of the first aspect, a first step surface is formed between the second portion and the first portion, and the fourth limiting portion extends to the first step surface.

[0021] In the above scheme, since the fourth limiting portion extends to the first step surface, on the one hand, the step surface can be used as a positioning reference when the electrode terminal is matched with the first insulating member, thereby simplifying the assembly difficulty; on the other hand, the fourth limiting portion not only plays an anti-rotation role but also serves as a reinforcing rib to a certain extent to improve the structural strength of the joint position between the first part and the second part; on the other hand, the first step surface and the fourth limiting portion cooperate with each other to improve the connection strength between the first insulating member and the electrode terminal, thereby further improving the anti-rotation effect of the electrode terminal.

[0022] In one or more embodiments of the first aspect, the first insulating member has a first end surface abutting against the first step surface, and the third limiting portion is provided on the inner circumferential surface of the first insulating member and extends to the first end surface.

[0023] In the above solution, when the electrode terminal and / or the first insulating member are subjected to force, the third stopper, disposed on the inner circumference of the first insulating member and extending to the first end face, can reduce the risk of overall distortion of the first insulating member. This can improve the first insulating member's insulation effect on the electrode terminal, making the first insulating member more resistant to deformation and providing greater structural stability. Furthermore, this can reduce the difficulty of assembling the first insulating member.

[0024] In one or more embodiments of the first aspect, along the radial direction of the electrode terminal, a dimension of the fourth limiting portion protruding from the outer circumferential surface of the second portion is smaller than a dimension of the first portion protruding from the outer circumferential surface of the second portion.

[0025] In this solution, during assembly of the electrode terminal and the first insulating member, the fourth stopper's projection from the outer circumference of the second portion is smaller than the projection of the first portion from the outer circumference of the second portion. This reduces the risk of interference between the fourth stopper and the first insulating member or other structures, making assembly easier. This also reduces the space occupied by the fourth stopper, further shortening the moment arm of the force acting on the first wall when the electrode terminal is subjected to force, thereby increasing the strength of the first wall. Furthermore, the number of areas with a high risk of stress concentration between the electrode terminal and the first insulating member is reduced.

[0026] In one or more embodiments of the first aspect, the fourth limiting portion is a second protrusion, the third limiting portion is a second groove, and at least a portion of the second protrusion is embedded in the second groove.

[0027] In the above solution, the fourth limiting portion is designed as the second protrusion, and the third limiting portion is designed as the second groove, which reduces the processing difficulty and cost.

[0028] In one or more embodiments of the first aspect, along the radial direction of the electrode terminal, a portion of the first insulating member is located between the outer circumferential surface of the first portion and the connecting member.

[0029] In the above solution, the portion of the first insulating member located radially between the outer circumference of the first portion and the connector in the electrode terminal's radial direction can provide a certain positioning function, thereby reducing the difficulty of assembling the first insulating member and the electrode terminal. This also improves the insulating effect of the first insulating member on the electrode terminal and the connector.

[0030] In one or more embodiments of the first aspect, the connector includes a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion is connected to the first wall. The second connecting portion is located on an inner circumference of the first connecting portion and is further away from the interior of the housing than the first connecting portion along the thickness of the first wall. The third connecting portion connects the first and second connecting portions. In the radial direction of the electrode terminal, the fourth limiting portion at least partially overlaps with a projection of the second connecting portion.

[0031] In the above solution, along the radial direction of the electrode terminal, the projections of the fourth limiting portion and the second connecting portion at least partially overlap, so that the fourth limiting portion and the second connecting portion share a portion of space in the thickness direction of the first wall, which is beneficial to improving the energy density of the battery cell.

[0032] In one or more embodiments of the first aspect, a third groove is provided on the outer peripheral surface of the first insulating member, the third groove extends along the circumference of the first insulating member, a portion of the connecting member is embedded in the third groove, and the second limiting portion is provided on the bottom surface of the third groove.

[0033] In the above solution, the third groove serves as a reference for the assembly of the connector and the first insulating member, thereby simplifying the assembly of the connector and the first insulating member. Furthermore, the second stopper, located on the bottom surface of the third groove, cooperates with the bottom surface of the third groove to enhance the connection strength between the first insulating member and the electrical connector, further improving the anti-rotation effect of the electrode terminal. Furthermore, the provision of the third groove increases the contact area between the first insulating member and the connector, thereby enhancing the insulation effect of the first insulating member on the third groove.

[0034] In one or more embodiments of the first aspect, a recess is provided on an outer surface of the first wall, and a portion of the electrode terminal is located in the recess.

[0035] In the above solution, a portion of the electrode terminal is located in the recess, which can make the electrode terminal further away from the connection position between the connector and the first wall in the thickness direction of the first wall. After the electrode terminal is subjected to force, the force acting on the first wall is smaller, and the first wall can have higher strength, which is beneficial to improving the reliability of the battery cell.

[0036] 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.

[0037] 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.

[0038] In one or more embodiments of the first aspect, the protrusion includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connects the bottom wall and the main body, and the first through hole is provided in the bottom wall.

[0039] In the above solution, since the first through hole is provided on the bottom wall of the protrusion, when the electrode terminal is electrically connected, the recess formed by the protrusion can play a certain positioning effect on the electrode terminal, which is conducive to reducing the difficulty of assembling the electrode terminal.

[0040] In one or more embodiments of the first aspect, the connecting member is welded and fixed to the first wall to form a first welding portion, and along the thickness direction of the first wall, a projection of the first welding portion at least partially overlaps with a projection of the peripheral wall.

[0041] In the above solution, since the thickness of the peripheral wall is relatively thick, the risk of deformation of the first wall when subjected to force is low. Setting the projection of the first welding portion to overlap with the projection of the peripheral wall can reduce the risk of failure of the first welding portion, thereby helping to improve the reliability of the battery cell.

[0042] In one or more embodiments of the first aspect, the battery cell further includes a first seal, which is disposed in the recess, and the outer peripheral surface of the electrode terminal has a first pressing surface. Along the radial direction of the electrode terminal, the first seal is configured to be clamped between the first pressing surface and the inner peripheral surface of the recess.

[0043] In the above scheme, the first seal is clamped between the first pressing surface and the inner circumferential surface of the recess, which can reduce the force exerted on the electrode terminal in the thickness direction of the first wall, thereby facilitating further reducing the force exerted on the first wall in the thickness direction of the first wall, reducing the risk of torsional deformation of the first wall, and improving the reliability of the battery cell.

[0044] 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.

[0045] 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 first seal.

[0046] In one or more embodiments of the first aspect, the electrode terminal has a second pressing surface, which is arranged opposite to the bottom surface of the recess along the thickness direction of the first wall, 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.

[0047] 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.

[0048] In one or more embodiments of the first aspect, the battery cell further includes a second insulating member, and along the thickness direction of the first wall, at least a portion of the second insulating member is disposed between the outer surface of the first wall and the second pressing surface.

[0049] In the above solution, the provision of the second insulating member can reduce the risk of short circuit between the electrode terminal and the first wall, which is beneficial to improving the reliability of the battery cell.

[0050] In one or more embodiments of the first aspect, the battery cell further includes a second sealant, and at least a portion of the second sealant is disposed between the electrode terminal and the first wall along a thickness direction of the first wall.

[0051] In the above solution, since at least a portion of the second seal is arranged between the electrode terminal and the first wall along the thickness direction of the first wall, the reaction force of the second seal will also act on the electrode terminal and the first wall, shortening the force acting on the first wall. On the one hand, it can improve the strength of the first wall, and on the other hand, it can also reduce the risk of sealing failure of the second seal, which is beneficial to improving the reliability of the battery cell.

[0052] In one or more embodiments of the first aspect, the battery cell further includes a third sealant, and along a radial direction of the electrode terminal, at least a portion of the third sealant is sandwiched between the electrode terminal and the connector.

[0053] In the above scheme, at least a portion of the third seal is sandwiched between the electrode terminal and the connector, which can reduce the force exerted on the electrode terminal in the thickness direction of the first wall, thereby facilitating further reducing the force exerted on the first wall in the thickness direction of the first wall, reducing the risk of torsional deformation of the first wall, and improving the reliability of the battery cell.

[0054] In one or more embodiments of the first aspect, the connecting member is welded to the first wall; or the connecting member is integrally formed with the first wall.

[0055] In the above solution, welding the connector to the first wall can reduce the production cost of the battery cell; integrally forming the connector and the first wall can improve the structural stability of the connection position between the connector and the first wall.

[0056] 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.

[0057] In the above solution, the first wall being the end cover is conducive to reducing the difficulty of assembling the electrode terminal, the connector and the first insulating member to the housing, thereby improving the production efficiency of the battery cell.

[0058] In a second aspect, the present application provides a battery, comprising the battery cell according to one or more embodiments of the first aspect.

[0059] 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.

[0060] 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.

[0061] In the above scheme, since the battery cells in one or more embodiments of the first aspect have higher reliability, the electrical equipment including the battery cells in one or more embodiments of the first aspect also has higher reliability; or, since the batteries in one or more embodiments of the second aspect have higher reliability, the electrical equipment including the batteries in one or more embodiments of the second aspect also has higher reliability.

[0062] 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

[0063] 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:

[0064] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0065] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0066] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0067] FIG4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0068] FIG5 is a partial enlarged view of point A in FIG4 of the present application;

[0069] FIG6 is an exploded view of a portion of a battery cell according to some embodiments of the present application;

[0070] FIG7 is a schematic structural diagram of a first insulating member in some embodiments of the present application;

[0071] FIG8 is a schematic structural diagram of a connector according to some embodiments of the present application;

[0072] FIG9 is a schematic structural diagram of electrode terminals according to some embodiments of the present application;

[0073] FIG10 is a cross-sectional view of a portion of a battery cell according to some embodiments of the present application;

[0074] FIG11 is a partial enlarged view of point B in FIG10 of the present application;

[0075] FIG12 is a cross-sectional view of a portion of a battery cell according to some other embodiments of the present application;

[0076] FIG13 is a cross-sectional view of a portion of a battery cell according to some other embodiments of the present application;

[0077] FIG14 is a cross-sectional view of a portion of the structure of a battery cell according to some further embodiments of the present application.

[0078] The reference numerals in the specific embodiments are as follows: 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery; 11 - housing; 111 - first housing body; 112 - second housing body; 12 - battery cell; 121 - housing; 1210 - first wall; 12101 - recessed portion; 12102 - body; 12103 - convex portion; 121031 - peripheral wall; 121032 - bottom wall; 1211 - end cap; 1212 - housing; 122 - electrode assembly; 123 - adapter plate; 124 - electrode terminal; 1241 - first portion; 1242 - second portion; 1243 - fourth limiting portion; 1244-first step surface; 1245-first pressing surface; 1246-second pressing surface; 125-first insulating member; 1251-second limiting portion; 1252-third limiting portion; 1253-first end surface; 1254-third groove; 126-connecting member; 1261-first limiting portion; 1262-first connecting portion; 1263-second connecting portion; 1264-third connecting portion; 127-first sealing member; 128-second insulating member; 129-third insulating member; 1220-first welding portion; 1221-second sealing member; 1222-third sealing member. DETAILED DESCRIPTION

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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).

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] Some battery cells also include an upper plastic and a welding ring. The welding ring secures the electrode terminal by interfacing with the upper plastic and end cap. The upper plastic also serves as an insulating end cap and electrode terminal. When an external force is applied to the electrode terminal, the force is transmitted from the welding ring to the electrode terminal. If excessive force is transmitted from the electrode terminal to the end cap along its thickness, there is a high risk of distortion of the end cap, which can reduce the reliability of the battery cell.

[0091] In view of this, the present application provides a battery cell, comprising a housing, an electrode terminal, a connector, and a first insulating member. The housing includes a first wall, the first wall being provided with a first through-hole. The electrode terminal covers the first through-hole. The connector protrudes from the outer surface of the first wall and is disposed around the electrode terminal. The first insulating member connects the connector and the electrode terminal to separate the connector and the electrode terminal. The connector is provided with a first limiting portion, and the first insulating member is provided with a second limiting portion. The first limiting portion cooperates with the second limiting portion to limit circumferential rotation of the first insulating member relative to the connector. The projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal. Because the projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal, the distance between the connection point between the connector and the first wall and the electrode terminal is relatively short. When the electrode terminal is subjected to force, the force arm of the force acting on the first wall is short, the force applied to the first wall is small, and the first wall has a higher strength, thereby improving the reliability of the battery cell.

[0092] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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 a single open surface. 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 surface. The open surface of the first housing body 111 and the open surface 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 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 .

[0098] Optionally, the battery 100 may also include other structures, which are not described in detail here. For example, the battery may also include a busbar assembly, which is used to electrically connect the multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar assembly can achieve electrical connection between the battery cells 12 by connecting to the electrode terminals 124 of the battery cells 12. Furthermore, the busbar assembly 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 housing 11 via a conductive mechanism.

[0099] 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.

[0100] 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.

[0101] 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 according to actual use requirements. A plurality of independent electrode assemblies 122 are provided in the battery cell 12.

[0102] According to some embodiments of the present application, please refer to Figures 3 to 10. The present application provides a battery cell 12, which includes a housing 121, an electrode terminal 124, a connector 126, and a first insulating member 125. The housing 121 includes a first wall 1210, and the first wall 1210 is provided with a first through hole. The electrode terminal 124 covers the first through hole. The connector 126 protrudes from the outer surface of the first wall 1210 and is arranged around the electrode terminal 124. The first insulating member 125 connects the connector 126 and the electrode terminal 124 to separate the connector 126 and the electrode terminal 124. Among them, the connecting member 126 is provided with a first limiting portion 1261, and the first insulating member 125 is provided with a second limiting portion 1251. The first limiting portion 1261 cooperates with the second limiting portion 1251 to limit the circumferential rotation of the first insulating member 125 relative to the connecting member 126. The projection of the first limiting portion 1261 and / or the second limiting portion 1251 at least partially overlaps with the projection of the electrode terminal 124.

[0103] 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.

[0104] 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 .

[0105] 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.

[0106] 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.

[0107] 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.

[0108] The first wall 1210 may be the end cover 1211 or any wall portion of the housing 1212 .

[0109] 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.

[0110] In some embodiments, the first through hole 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, 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.

[0111] 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.

[0112] In some embodiments, the electrode terminal 124 can be electrically connected to the tab of the electrode assembly 122 through the adapter 123 .

[0113] 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.

[0114] The electrode terminal 124 covers the first through-hole, meaning that the electrode terminal 124 can be electrically connected to the electrode assembly 122 through the provision of the first through-hole. In some embodiments, a portion of the electrode terminal 124 is located within the first through-hole, and a portion of the adapter 123 is also located within the first through-hole, with the electrode assembly 122 electrically connected to the electrode terminal 124 via the adapter 123. In other embodiments, a portion of the adapter 123 passes through the first through-hole to be electrically connected to the electrode terminal 124 covering the first through-hole. In still other embodiments, a portion of the electrode terminal 124 passes through the first through-hole to be electrically connected to the adapter 123.

[0115] 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.

[0116] The cross section of the connecting member 126 may be L-shaped, Z-shaped, linear, wavy, etc.

[0117] 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.

[0118] In some embodiments, the connector 126 may be connected to the first wall 1210 by bolting, clamping, or bonding.

[0119] After the connector 126 and the first wall 1210 are connected, refer to Figure 11. If they are welded, the connection point is the weld mark. Refer to Figure 13. If they are integrally molded, the connection point is the point where they are separated. If they are bonded, bolted, or otherwise connected, the connection point is the point at which they touch the interface farthest from the electrode terminal 124.

[0120] The first insulating member 125 may be pre-formed and then 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.

[0121] The material of the first insulating member 125 may include but is not limited to rubber, silicone or plastic.

[0122] The first 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 first insulating member 125. This also means that the first insulating member 125 can be used to insulate and isolate the connector 126 from the electrode terminal 124.

[0123] The first limiting portion 1261 may be a protrusion or a groove, and the second limiting portion 1251 may be a protrusion or a groove that matches the first limiting portion 1261 .

[0124] There can be multiple first limiting portions 1261, for example, as shown in FIG8 , there are six first limiting portions 1261. There can be multiple second limiting portions 1251, for example, as shown in FIG7 , there are six second limiting portions 1251.

[0125] The projection of the first limiting portion 1261 and / or the second limiting portion 1251 at least partially overlaps with the projection of the electrode terminal 124, which means that compared with the battery cell 12 in which the projection of the first limiting portion 1261 and / or the second limiting portion 1251 does not overlap with the projection of the electrode terminal 124, the distance between the connection position between the connector 126 and the first wall 1210 and the electrode terminal 124 is relatively short, and the force arm of the force acting on the first wall 1210 after the electrode terminal 124 is subjected to force is shorter.

[0126] In the embodiment where the first limiting portion 1261 is a groove, the projection of the first limiting portion 1261 at least partially overlaps with the projection of the electrode terminal 124, which means that the groove falls within the projection of the electrode terminal 124. In the embodiment where the second limiting portion 1251 is a groove,

[0127] This means that the groove falls within the projection of the electrode terminal 124 .

[0128] In some embodiments, the first limiting portion 1261 is a groove that penetrates the connecting member 126 along the thickness direction of the first wall 1210 .

[0129] Generally, when a force acts along its thickness, the first wall 1210 is at a higher risk of torsional deformation. Factors contributing to torsional deformation are related to the magnitude of the force and the length of the moment arm. That is, the greater the moment arm of the force acting along its thickness, the higher the risk of torsional deformation. The greater the force, the higher the risk of torsional deformation. Because the electrode terminal 124 is held in place by the connector 126 and the first wall 1210, when the battery cell 12 is subjected to an external force, the distance between the connection point between the connector 126 and the first wall 1210 and the electrode terminal 124 can be considered the moment arm of the force acting on the first wall 1210.

[0130] In the technical solution of the embodiment of the present application, since the projection of the first limiting portion 1261 and / or the second limiting portion 1251 at least partially overlaps with the projection of the electrode terminal 124, the force arm of the force acting on the first wall 1210 after the electrode terminal 124 is subjected to force is shorter, and the force applied to the first wall 1210 is smaller, which can make the first wall 1210 have higher strength, thereby facilitating improving the reliability of the battery cell 12.

[0131] According to some embodiments of the present application, referring to FIG. 3 to FIG. 10 , the first limiting portion 1261 is provided on the inner circumferential surface of the connecting member 126 .

[0132] The first limiting portion 1261 can be set at any position on the inner circumference of the connecting member 126 . For example, the first limiting portion 1261 can be set on the inner circumference of the connecting member 126 close to the first wall 1210 or away from the first wall 1210 .

[0133] In the above solution, on the one hand, the processing of the first limiting portion 1261 is made more convenient and the processing difficulty is reduced; on the other hand, the difficulty of matching the connecting member 126 with the first insulating member 125 is also reduced.

[0134] According to some embodiments of the present application, referring to FIG. 3 to FIG. 10 , the first limiting portion 1261 is a first groove, the second limiting portion 1251 is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

[0135] The first groove and the first protrusion can be formed by machining, or by casting, 3D printing, injection molding, etc.

[0136] The anti-rotation structure is formed by engaging the first groove and the first protrusion, which has the advantages of low processing difficulty and low matching difficulty.

[0137] According to some embodiments of the present application, referring to Figures 3-10 , the connector 126 includes a first connector 1262, a second connector 1263, and a third connector 1264. The first connector 1262 is connected to the first wall 1210. The second connector 1263 is located on the inner circumference of the first connector 1262. Along the thickness direction of the first wall 1210, the second connector 1263 is further away from the interior of the housing 121 than the first connector 1262. The third connector 1264 connects the first connector 1262 and the second connector 1263. The first stopper 1261 is disposed on the inner circumference of the second connector 1263.

[0138] The second connection portion 1263 is located on the inner circumference of the first connection portion 1262, and the third connection portion 1264 connects the first connection portion 1262 and the second connection portion 1263. This means that the cross section of the connection member 126 is Z-shaped.

[0139] 8 and 10 , the connecting areas between the first connecting portion 1262, the second connecting portion 1263, and the third connecting portion 1264 may be rounded. In some embodiments, the first limiting portion 1261 may be a groove provided on the inner circumference of the second connecting portion 1263. In other embodiments, the first limiting portion 1261 may extend through the second connecting portion 1263 along the thickness direction of the first wall 1210.

[0140] In the above solution, since the second connecting portion 1263 is located on the inner circumference of the first connecting portion 1262, the cross-section of the connecting member 126 has a Z-shaped structure, which helps to disperse the stress of the connecting member 126 and improve the strength of the connecting member 126. The first limiting portion 1261 is arranged on the inner circumference of the second connecting portion 1263. This not only reduces the difficulty of assembling the connecting member 126 with the first wall 1210, but also brings the first limiting portion 1261 closer to the first insulating member 125, thereby improving the anti-rotation effect of the first limiting portion 1261 on the first insulating member 125. It also brings the second connecting portion 1263 closer to the electrode terminal 124, thereby improving the limiting effect of the connecting member 126 on the electrode terminal 124.

[0141] According to some embodiments of the present application, please refer to Figures 3-10, the first insulating member 125 is provided with a third limiting portion 1252, and the electrode terminal 124 is provided with a fourth limiting portion 1243, and the third limiting portion 1252 cooperates with the fourth limiting portion 1243 to limit the circumferential rotation of the electrode terminal 124 relative to the first insulating member 125.

[0142] The third limiting portion 1252 may be a protrusion or a groove. The fourth limiting portion 1243 may be a protrusion or a groove.

[0143] In some embodiments, along the radial direction of the electrode terminal 124, the projections of the third limiting portion 1252 and the second limiting portion 1251 may at least partially overlap. In other embodiments, along the radial direction of the electrode terminal 124, the projections of the third limiting portion 1252 and the second limiting portion 1251 may be staggered.

[0144] The third limiting portion 1252 and the fourth limiting portion 1243 are provided to prevent rotation and can also be used for positioning during assembly.

[0145] There can be multiple third limiting portions 1252, for example, as shown in FIG7 , there are six third limiting portions 1252. There can be multiple fourth limiting portions 1243, for example, as shown in FIG9 , there are six fourth limiting portions 1243.

[0146] In the above scheme, by setting the third limiting portion 1252 and the fourth limiting portion 1243 that cooperate with each other, the electrode terminal 124 can be limited from rotating relative to the first insulating member 125, which is beneficial to improving the structural stability of the battery cell 12 and at the same time reducing the difficulty of assembling the connecting member 126, the first insulating member 125 and the electrode terminal 124.

[0147] According to some embodiments of the present application, referring to FIG. 3 to FIG. 10 , along the radial direction of the electrode terminal 124 , the projection of the third limiting portion 1252 at least partially overlaps with the projection of the second limiting portion 1251 .

[0148] Along the radial direction of the electrode terminal 124, the projection of the third limiting portion 1252 at least partially overlaps with the projection of the second limiting portion 1251. This means that when one of the third limiting portion 1252 and the second limiting portion 1251 is subjected to a torsional force, the other can provide auxiliary anti-rotation assistance in the radial direction of the electrode terminal 124. This also means that the two portions share some space in the thickness direction of the first wall 1210.

[0149] In the above solution, the projection of the third limiting portion 1252 at least partially overlaps with the projection of the second limiting portion 1251 along the radial direction of the electrode terminal 124. On the one hand, the second limiting portion 1251 and the third limiting portion 1252 share a portion of the space in the thickness direction of the first wall 1210, which helps to improve the energy density of the battery cell 12. On the other hand, when the first insulating member 125 is subjected to force, the risk of distortion is reduced, which improves its ability to withstand external forces or internal stresses and helps to improve its structural stability. Furthermore, this facilitates the pre-positioning of the connector 126, the first insulating member 125, and the electrode terminal 124 during assembly, reducing the difficulty of assembly.

[0150] According to some embodiments of the present application, please refer to Figures 3 to 10. The electrode terminal 124 includes a first part 1241 and a second part 1242. Along the thickness direction of the first wall 1210, the first part 1241 is located between the first wall 1210 and the connector 126, and the second part 1242 is located on the side of the first part 1241 that is away from the interior of the battery cell 12. The diameter of the second part 1242 is smaller than the diameter of the first part 1241, and the fourth limiting portion 1243 is arranged on the outer peripheral surface of the second part 1242.

[0151] The diameter of the second portion 1242 is smaller than that of the first portion 1241, meaning that there is space between the outer circumference of the second portion 1242 and the outer circumference of the first portion 1241. This space can be used to arrange the anti-rotation structure and the first insulating member 125. In other words, the fourth limiting portion 1243 does not occupy the space outside the electrode terminal 124, thereby shortening the distance between the electrode terminal 124 and the connection point between the connector 126 and the first wall 1210 to a certain extent.

[0152] The fourth limiting portion 1243 is provided on the outer circumference of the second portion 1242, which means that the first portion 1241 can be used as a reference when setting the fourth limiting portion 1243. At the same time, the outer circumference of the first portion 1241 is an integral annular surface, and the stress concentration area is small.

[0153] In the above solution, because the diameter of the second portion 1242 is smaller than the diameter of the first portion 1241, the space occupied by the electrode terminal 124 assembly can be reduced. This helps to further shorten the distance between the electrode terminal 124, the connection point between the connector 126, and the first wall 1210 while ensuring stable assembly of the electrode terminal 124. This also helps to further shorten the force arm acting on the first wall 1210 when the electrode terminal 124 is subjected to force, thereby improving the strength of the first wall 1210. At the same time, the contact area between the electrode terminal 124 and the first insulating member 125 can be increased, thereby improving the insulation effect of the first insulating member 125 on the electrode terminal 124.

[0154] According to some embodiments of the present application, referring to FIG. 3 to FIG. 10 , a first step surface 1244 is formed between the second portion 1242 and the first portion 1241 , and the fourth limiting portion 1243 extends to the first step surface 1244 .

[0155] Fourth stopper 1243 extends to first stepped surface 1244, meaning that fourth stopper 1243 contacts both first portion 1241 and second portion 1242, thereby increasing the strength of electrode terminal 124. Furthermore, first stepped surface 1244 also increases the structural stability of fourth stopper 1243, thereby improving the anti-rotation effect.

[0156] In the above scheme, since the fourth limiting portion 1243 extends to the first step surface 1244, on the one hand, the step surface can be used as a positioning reference when the electrode terminal 124 is matched with the first insulating member 125, thereby simplifying the assembly difficulty; on the other hand, the fourth limiting portion 1243 not only plays an anti-rotation role, but also serves as a reinforcing rib to a certain extent to improve the structural strength of the joint position between the first part 1241 and the second part 1242; on the other hand, the first step surface 1244 and the fourth limiting portion 1243 cooperate with each other to improve the connection strength between the first insulating member 125 and the electrode terminal 124, thereby further improving the anti-rotation effect of the electrode terminal 124.

[0157] According to some embodiments of the present application, referring to Figures 3 to 10, the first insulating member 125 has a first end surface 1253 abutting against the first step surface 1244, and the third limiting portion 1252 is arranged on the inner circumference of the first insulating member 125 and extends to the first end surface 1253.

[0158] Compared with the arrangement in which the third limiting portion 1252 is arranged on the inner circumferential surface of the first insulating member 125 and there is a distance between it and its end face, when the electrode terminal 124 and / or the first insulating member 125 is subjected to force, the third limiting portion 1252 extends to the first end face 1253, which can reduce the risk of excessive distortion of the first insulating member 125.

[0159] In the above solution, when the electrode terminal 124 and / or the first insulating member 125 are subjected to a force, the third stopper 1252 is provided on the inner circumference of the first insulating member 125 and extends to the first end surface 1253. This reduces the risk of overall distortion of the first insulating member 125, thereby improving the insulation effect of the first insulating member 125 on the electrode terminal 124, making the first insulating member 125 more resistant to deformation and providing greater structural stability. Furthermore, this reduces the difficulty of assembling the first insulating member 125.

[0160] According to some embodiments of the present application, referring to Figures 3-10, along the radial direction of the electrode terminal 124, the size of the fourth limiting portion 1243 protruding from the outer circumference of the second portion 1242 is smaller than the size of the first portion 1241 protruding from the outer circumference of the second portion 1242.

[0161] Along the radial direction of the electrode terminal 124, the dimension of the fourth limiting portion 1243 protruding from the outer peripheral surface of the second portion 1242 is smaller than the dimension of the first portion 1241 protruding from the outer peripheral surface of the second portion 1242, which means that in the radial direction of the electrode terminal 124, the fourth limiting portion 1243 will not protrude from the first portion 1241, and thus when the electrode terminal 124 is assembled, the risk of the fourth limiting portion 1243 interfering with the connecting member 126 or other components is low.

[0162] In this solution, during assembly of the electrode terminal 124 and the first insulating member 125, because the protrusion of the fourth stopper 1243 from the outer circumference of the second portion 1242 is smaller than the protrusion of the first portion 1241 from the outer circumference of the second portion 1242, the risk of interference between the fourth stopper 1243 and the first insulating member 125 or other structures is reduced, making assembly easier. This also reduces the space occupied by the fourth stopper 1243. When the electrode terminal 124 is subjected to force, this helps further shorten the moment arm of the force acting on the first wall 1210, thereby increasing the strength of the first wall 1210. Furthermore, the number of areas with a high risk of stress concentration between the electrode terminal 124 and the first insulating member 125 is reduced.

[0163] According to some embodiments of the present application, referring to FIG. 3 to FIG. 10 , the fourth limiting portion 1243 is a second protrusion, the third limiting portion 1252 is a second groove, and at least a portion of the second protrusion is embedded in the second groove.

[0164] The second groove and the second protrusion can be formed by machining, or by casting, 3D printing, injection molding, etc.

[0165] In the above solution, the fourth limiting portion 1243 is designed as a second protrusion, and the third limiting portion 1252 is designed as a second groove, which reduces the processing difficulty and cost.

[0166] According to some embodiments of the present application, referring to FIG. 3 to FIG. 10 , along the radial direction of the electrode terminal 124 , a portion of the first insulating member 125 is located between the outer circumferential surface of the first portion 1241 and the connecting member 126 .

[0167] In some embodiments, along the radial direction of the electrode terminal 124, a portion of the first insulating member 125 is located between the outer circumferential surface of the first portion 1241 and the connector 126. This means that a portion of the first insulating member 125 can form a cover, and the cover covering the electrode terminal 124 can reduce the difficulty of assembling the first insulating member 125.

[0168] In the above solution, the portion of the first insulating member 125 located between the outer circumferential surface of the first portion 1241 and the connecting member 126 along the radial direction of the electrode terminal 124 can play a certain positioning role, thereby reducing the difficulty of assembling the first insulating member 125 and the electrode terminal 124. At the same time, the insulating effect of the first insulating member 125 on the electrode terminal 124 and the connecting member 126 can also be improved.

[0169] According to some embodiments of the present application, referring to Figures 3-10 , the connector 126 includes a first connector 1262, a second connector 1263, and a third connector 1264. The first connector 1262 is connected to the first wall 1210. The second connector 1263 is located on the inner circumference of the first connector 1262 and is further away from the interior of the housing 121 than the first connector 1262 along the thickness direction of the first wall 1210. The third connector 1264 connects the first connector 1262 and the second connector 1263. In the radial direction of the electrode terminal 124, the projection of the fourth limiting portion 1243 at least partially overlaps with the projection of the second connector 1263.

[0170] Along the radial direction of the electrode terminal 124 , the projections of the fourth limiting portion 1243 and the second connecting portion 1263 at least partially overlap, which means that in the thickness direction of the first wall 1210 , the fourth limiting portion 1243 and the second connecting portion 1263 share part of the space.

[0171] In the above solution, along the radial direction of the electrode terminal 124 , the projections of the fourth limiting portion 1243 and the second connecting portion 1263 at least partially overlap, which is beneficial for improving the energy density of the battery cell 12 .

[0172] According to some embodiments of the present application, please refer to Figures 3-10, a third groove 1254 is provided on the outer peripheral surface of the first insulating member 125, the third groove 1254 extends along the circumference of the first insulating member 125, a portion of the connecting member 126 is embedded in the third groove 1254, and the second limiting portion 1251 is provided on the bottom surface of the third groove 1254.

[0173] A portion of the connector 126 is embedded in the third groove 1254 , which means that the bottom and side surfaces of the third groove 1254 can contact the connector 126 , thereby increasing the contact area between the first insulating member 125 and the connector 126 .

[0174] A portion of the connecting member 126 is embedded in the third groove 1254 , which helps to improve the connection strength between the connecting member 126 and the first insulating member 125 .

[0175] The second limiting portion 1251 is disposed on the bottom surface of the third groove 1254 , which means that the bottom surface of the third groove 1254 can also improve the structural stability of the second limiting portion 1251 , thereby facilitating an improved anti-rotation effect.

[0176] In the above embodiment, the third groove 1254 serves as a reference for the assembly of the connector 126 and the first insulating member 125, thereby simplifying the assembly of the connector 126 and the first insulating member 125. Furthermore, the second stopper 1251 is disposed on the bottom surface of the third groove 1254. The interaction between the second stopper 1251 and the bottom surface of the third groove 1254 strengthens the connection strength between the first insulating member 125 and the electrical connector 126, further enhancing the anti-rotation effect of the electrode terminal 124. Furthermore, the provision of the third groove 1254 increases the contact area between the first insulating member 125 and the connector 126, thereby enhancing the insulation effect of the first insulating member 125 on the third groove 1254.

[0177] According to some embodiments of the present application, referring to FIG. 3 to FIG. 11 , a recess 12101 is provided on the outer surface of the first wall 1210 , and a portion of the electrode terminal 124 is located in the recess 12101 .

[0178] A portion of the electrode terminal 124 is located in the recess 12101, which means that part of the space of the first wall 1210 can accommodate part of the electrode terminal 124. After the electrode terminal 124 is subjected to force, the force acting on the first wall 1210 along the thickness direction of the first wall 1210 will be decomposed in other directions, thereby reducing the force applied to the first wall 1210 along the thickness direction of the first wall 1210.

[0179] The recess 12101 may be formed by machining, or by punching the first wall 1210 to form the protrusion 12103 .

[0180] In some embodiments, 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.

[0181] In the above solution, a portion of the electrode terminal 124 is located in the recess 12101, which can make the electrode terminal 124 further away from the connection position between the connector 126 and the first wall 1210 in the thickness direction of the first wall 1210. After the electrode terminal 124 is subjected to force, the force acting on the first wall 1210 is smaller, and the first wall 1210 can have higher strength, which is beneficial to improving the reliability of the battery cell 12.

[0182] According to some embodiments of the present application, please refer to Figures 3-11, 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.

[0183] 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 .

[0184] The convex portion 12103 and the concave portion 12101 may also be formed by machining.

[0185] 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 reducing the manufacturing cost of the battery cell 12 .

[0186] According to some embodiments of the present application, please refer to Figures 3 to 11. The protrusion 12103 includes a bottom wall 121032 and a peripheral wall 121031 surrounding the bottom wall 121032. The peripheral wall 121031 connects the bottom wall 121032 and the main body 12102. The first through hole is set in the bottom wall 121032.

[0187] In some embodiments, a portion of the electrode terminal 124 and / or a portion of the adapter plate 123 may extend into the first through-hole for electrical connection. For example, the electrical connection may be achieved through welding, abutment, or snap-fit ​​connection. In this case, since the first through-hole is located on the bottom wall 121032, the recess 12101 formed by the protrusion 12103 can pre-position the electrode terminal 124.

[0188] In the above solution, since the first through hole is arranged on the bottom wall 121032 of the protrusion 12103, when the electrode terminal 124 is electrically connected, the recess 12101 formed by the protrusion 12103 can have a certain positioning effect on the electrode terminal 124, which is beneficial to reduce the difficulty of assembling the electrode terminal 124.

[0189] According to some embodiments of the present application, please refer to Figures 3-11, the connecting member 126 is welded and fixed to the first wall 1210 to form a first welding portion 1220. Along the thickness direction of the first wall 1210, the projection of the first welding portion 1220 at least partially overlaps with the projection of the peripheral wall 121031.

[0190] The projection of the first welding portion 1220 at least partially overlaps with the projection of the peripheral wall 121031, which means that when the first wall 1210 is subjected to force, the risk of deformation is lower due to the relatively thick thickness of the peripheral wall 121031, thereby reducing the risk of failure of the first welding portion 1220.

[0191] In the above solution, the projection of the first welding portion 1220 at least partially overlaps with the projection of the peripheral wall 121031 , which is beneficial to improving the reliability of the battery cell 12 .

[0192] According to some embodiments of the present application, please refer to Figures 3 to 11, the battery cell 12 also includes a first seal 127, the first seal 127 is arranged in the recess 12101, and the outer peripheral surface of the electrode terminal 124 has a first pressing surface 1245. Along the radial direction of the electrode terminal 124, the first seal 127 is configured to be clamped between the first pressing surface 1245 and the inner peripheral surface of the recess 12101.

[0193] The material of the first sealing member 127 may include but is not limited to rubber, polyurethane, polytetrafluoroethylene, etc.

[0194] Along the radial direction of the electrode terminal 124, the first seal 127 is disposed between the first pressing surface 1245 and the inner circumferential surface of the recess 12101. This means that after assembly, the first seal 127 will deform to a certain extent, and a portion of the first seal 127 will contact and abut against the first pressing surface 1245, and a portion of the first seal 127 will contact and abut against the inner circumferential surface of the recess 12101. In other words, the reaction force exerted by the first seal 127 on the electrode terminal 124 is along the radial direction of the electrode terminal 124.

[0195] 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 .

[0196] In the above scheme, the first seal 127 is clamped between the first pressing surface 1245 and the inner circumferential surface of the recess 12101, which can reduce the force exerted on the electrode terminal 124 in the thickness direction of the first wall 1210, thereby facilitating further reducing the force exerted on the first wall 1210 in the thickness direction of the first wall 1210, reducing the risk of torsional deformation of the first wall 1210, and improving the reliability of the battery cell 12.

[0197] According to some embodiments of the present application, referring to FIG. 3 to FIG. 11 , the angle between the inner circumferential surface of the recess 12101 and the bottom surface of the recess 12101 is a first obtuse angle.

[0198] The angle between the inner circumference of recess 12101 and its bottom surface is a first obtuse angle, which means that the inner circumference of recess 12101 can guide the first 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 recess 12101.

[0199] 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 first seal 127.

[0200] According to some embodiments of the present application, please refer to Figures 3 to 11, the electrode terminal 124 has a second pressing surface 1246, and along the thickness direction of the first wall 1210, the second pressing surface 1246 is arranged opposite to the bottom surface of the recess 12101, 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.

[0201] 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 first sealing member 127 during assembly, reducing assembly difficulty. Furthermore, after assembly, it is easier for the first sealing member 127 to deform and press against the first pressing surface 1245 and the inner circumference of the recess 12101.

[0202] 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 .

[0203] According to some embodiments of the present application, referring to FIG. 3-11 , the battery cell 12 further includes a second insulating member 128 . Along the thickness direction of the first wall 1210 , at least a portion of the second insulating member 128 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246 .

[0204] Along the thickness direction of the first wall 1210 , at least a portion of the second insulating member 128 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246 , meaning that the second insulating member 128 can be used to insulate and isolate the first wall 1210 and the electrode terminal 124 .

[0205] The material of the second insulating member 128 may include but is not limited to rubber, silicone, or plastic.

[0206] The shape of the second insulating member 128 may include, but is not limited to, a straight shape, an L shape, a wavy shape, and the like.

[0207] In the above solution, the provision of the second insulating member 128 can reduce the risk of short circuit between the electrode terminal 124 and the first wall 1210 , which is beneficial to improving the reliability of the battery cell 12 .

[0208] According to some embodiments of the present application, referring to FIG. 3 to FIG. 9 and FIG. 12 , the battery cell 12 further includes a second sealant 1221 . At least a portion of the second sealant 1221 is disposed between the electrode terminal 124 and the first wall 1210 along the thickness direction of the first wall 1210 .

[0209] At least a portion of the second sealing member 1221 is disposed between the electrode terminal 124 and the first wall 1210 along the thickness direction of the first wall 1210. This means that the reaction force of the second sealing member 1221 acts on the electrode terminal 124 along the thickness direction of the first wall 1210. This also means that the second sealing member 1221 can be assembled simultaneously with the electrode terminal 124 along the thickness direction of the first wall 1210, making assembly of the second sealing member 1221 relatively easy.

[0210] The material of the second sealing member 1221 may include but is not limited to rubber, polyurethane, polytetrafluoroethylene, etc.

[0211] If the first wall 1210 is deformed too much, the risk of the second sealing member 1221 being loosened is high. Therefore, increasing the strength of the first wall 1210 will reduce the risk of sealing failure of the second sealing member 1221.

[0212] In the above scheme, since at least a portion of the second seal 1221 is arranged between the electrode terminal 124 and the first wall 1210 along the thickness direction of the first wall 1210, the reaction force of the second seal 1221 will also act on the electrode terminal 124 and the first wall 1210, shortening the force wall of the first wall 1210. On the one hand, it can improve the strength of the first wall 1210, and on the other hand, it can also reduce the risk of sealing failure of the second seal 1221, which is beneficial to improving the reliability of the battery cell 12.

[0213] According to some embodiments of the present application, referring to Figures 3-9 and 13-14, the battery cell 12 also includes a third seal 1222. Along the radial direction of the electrode terminal 124, at least a portion of the third seal 1222 is sandwiched between the electrode terminal 124 and the connector 126.

[0214] The material of the third sealing member 1222 may include but is not limited to rubber, polyurethane, polytetrafluoroethylene, etc.

[0215] Along the radial direction of the electrode terminal 124, at least a portion of the third seal 1222 is sandwiched between the electrode terminal 124 and the connector 126. This means that after assembly, the third seal 1222 will deform to a certain extent, and a portion of the third seal 1222 will contact and abut against the electrode terminal 124, while another portion of the third seal 1222 will contact and abut against the connector 126. In other words, the reaction force exerted by the third seal 1222 on the electrode terminal 124 is along the radial direction of the electrode terminal 124.

[0216] In some embodiments, please refer to Figures 13 and 14. Along the radial direction of the electrode terminal 124, the portion of the surface of the connecting member 126 facing the electrode terminal 124 can be designed as a slope, that is, the edge of the cross-section of the connecting member 126 facing the electrode terminal 124 is inclined relative to the first wall 1210.

[0217] In the above scheme, at least a portion of the third seal 1222 is clamped between the electrode terminal 124 and the connector 126, which can reduce the force exerted on the electrode terminal 124 in the thickness direction of the first wall 1210, thereby facilitating further reducing the force exerted on the first wall 1210 in the thickness direction of the first wall 1210, reducing the risk of torsional deformation of the first wall 1210, and improving the reliability of the battery cell 12.

[0218] According to some embodiments of the present application, the connecting member 126 is welded to the first wall 1210 ; or the connecting member 126 is integrally formed with the first wall 1210 .

[0219] The connecting member 126 and the first wall 1210 can be welded by arc welding, laser welding or other welding methods.

[0220] The connecting member 126 and the first wall 1210 can be integrally formed by casting, stamping or machining.

[0221] In the above solution, welding the connector 126 to the first wall 1210 can reduce the production cost of the battery cell 12 ; integrally forming the connector 126 and the first wall 1210 can improve the structural stability of the connection position between the connector 126 and the first wall 1210 .

[0222] According to some embodiments of the present application, referring to FIG. 3 and FIG. 4 , 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 .

[0223] The first wall 1210 is an end cover 1211 , that is, the connecting member 126 , the electrode terminal 124 and the first insulating member 125 are all disposed on the end cover 1211 of the outer shell 121 .

[0224] In some embodiments, the second insulating member 128 is also disposed on the end cover 1211 .

[0225] In some embodiments, the first seal 127 is also disposed on the end cover 1211 .

[0226] In some embodiments, the second sealing member 1221 is also disposed on the end cover 1211 .

[0227] In some embodiments, a third seal 1222 is also disposed on the end cap 1211 .

[0228] 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 , the connector 126 and the first insulating member 125 to the housing 121 , thereby improving the production efficiency of the battery cell 12 .

[0229] 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 embodiments.

[0230] 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 one or more of the above embodiments also has high reliability.

[0231] 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.

[0232] 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.

[0233] According to some embodiments of the present application, with reference to FIG3-FIG11 , the present application provides a battery cell 12, which includes a housing 121, an electrode terminal 124, a connector 126, a first insulating member 125, a second insulating member 128, a third insulating member 129, a first sealing member 127, and a transition piece 123. The housing 121 includes a first wall 1210, the outer surface of which is provided with a recess 12101, and a portion of the electrode terminal 124 is located within the recess 12101. The first wall 1210 includes a body 12102 and a protrusion 12103, the protrusion 12103 protruding from the inner surface of the body 12102, and the outer surface of the first wall 1210 is provided with a recess 12101 at a position corresponding to the protrusion 12103. The protrusion 12103 includes a bottom wall 121032 and a peripheral wall 121031 surrounding the bottom wall 121032 . The peripheral wall 121031 connects the bottom wall 121032 and the main body 12102 . The first through hole is set in the bottom wall 121032 .

[0234] The connector 126 protrudes from the outer surface of the first wall 1210 and surrounds the electrode terminal 124. The first insulating member 125 connects the connector 126 and the electrode terminal 124, separating them. The connector 126 is provided with a first stopper 1261, and the first insulating member 125 is provided with a second stopper 1251. The first stopper 1261 cooperates with the second stopper 1251 to limit circumferential rotation of the first insulating member 125 relative to the connector 126. The projections of the first stopper 1261 and / or the second stopper 1251 at least partially overlap with the projection of the electrode terminal 124. The first stopper 1261 is provided on the inner circumferential surface of the connector 126. The first stopper 1261 is a first groove, and the second stopper 1251 is a first protrusion, at least a portion of which is embedded in the first groove.

[0235] The connector 126 includes a first connector 1262, a second connector 1263, and a third connector 1264. The first connector 1262 is connected to the first wall 1210. The first connector 1262 is welded to the first wall 1210 to form a first welded portion 1220. Along the thickness direction of the first wall 1210, the projection of the first welded portion 1220 at least partially overlaps with the projection of the peripheral wall 121031. The second connector 1263 is located on the inner circumference of the first connector 1262 and is further away from the interior of the housing 121 than the first connector 1262 along the thickness direction of the first wall 1210. The third connector 1264 connects the first connector 1262 and the second connector 1263. The first stopper 1261 is provided on the inner circumference of the second connector 1263.

[0236] The first insulating member 125 is provided with a third stopper 1252, and the electrode terminal 124 is provided with a fourth stopper 1243. The third stopper 1252 cooperates with the fourth stopper 1243 to limit the circumferential rotation of the electrode terminal 124 relative to the first insulating member 125. The electrode terminal 124 comprises a first portion 1241 and a second portion 1242. Along the thickness direction of the first wall 1210, the first portion 1241 is located between the first wall 1210 and the connector 126. The second portion 1242 is located on the side of the first portion 1241 facing away from the interior of the battery cell 12. The diameter of the second portion 1242 is smaller than that of the first portion 1241. The fourth stopper 1243 is provided on the outer circumference of the second portion 1242. A first stepped surface 1244 is formed between the second portion 1242 and the first portion 1241. The fourth stopper 1243 extends to the first stepped surface 1244. The first insulating member 125 has a first end surface 1253 that abuts the first stepped surface 1244. The third limiting portion 1252 is disposed on the inner circumference of the first insulating member 125 and extends to the first end surface 1253. The fourth limiting portion 1243 is a second protrusion, and the third limiting portion 1252 is a second groove, with at least a portion of the second protrusion embedded in the second groove.

[0237] Along the radial direction of electrode terminal 124, the dimension of fourth limiting portion 1243 protruding from the outer circumference of second portion 1242 is smaller than the dimension of first portion 1241 protruding from the outer circumference of second portion 1242. The projection of third limiting portion 1252 at least partially overlaps with the projection of second limiting portion 1251. A portion of first insulating member 125 is located between the outer circumference of first portion 1241 and connector 126. The projection of fourth limiting portion 1243 at least partially overlaps with the projection of second connector 1263.

[0238] A third groove 1254 is provided on the outer circumference of the first insulating member 125 . The third groove 1254 extends along the circumference of the first insulating member 125 . A portion of the connecting member 126 is embedded in the third groove 1254 . The second limiting portion 1251 is provided on the bottom surface of the third groove 1254 .

[0239] The battery cell 12 also includes a first seal 127, which is disposed within the recess 12101. The outer circumferential surface of the electrode terminal 124 has a first compression surface 1245. Along the radial direction of the electrode terminal 124, the first seal 127 is positioned between the first compression surface 1245 and the inner circumferential surface of the recess 12101. 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 also has a second compression surface 1246, which is disposed opposite the bottom surface of the recess 12101 along the thickness direction of the first wall 1210. The first compression surface 1245 is connected to the second compression surface 1246, and the angle between the first compression surface 1245 and the second compression surface 1246 is a second obtuse angle.

[0240] Along the thickness direction of the first wall 1210, at least a portion of the second insulating member 128 is disposed between the outer surface of the first wall 1210 and the second pressing surface 1246. At least a portion of the third insulating member 129 is disposed between the inner surface of the first wall 1210 and the adapter 123. The adapter 123 is welded to the electrode terminal 124.

[0241] Since the projection of the first limiting portion 1261 and / or the second limiting portion 1251 at least partially overlaps with the projection of the electrode terminal 124, the distance between the connection position of the connecting member 126 and the first wall 1210 and the electrode terminal 124 is relatively short. After the electrode terminal 124 is subjected to force, the force arm acting on the first wall 1210 is short, and the force applied to the first wall 1210 is small, which can make the first wall 1210 have higher strength, thereby helping to improve the reliability of the battery cell 12.

[0242] 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 comprises a first wall, wherein the first wall is provided with a first through hole; an electrode terminal covering the first through hole; a connecting member protruding from an outer surface of the first wall and arranged around the electrode terminal; a first insulating member connecting the connecting member and the electrode terminal and used to separate the connecting member and the electrode terminal; In which, the connecting member is provided with a first limiting portion, and the first insulating member is provided with a second limiting portion, the first limiting portion cooperates with the second limiting portion to limit the circumferential rotation of the first insulating member relative to the connecting member, and the projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal.

2. The battery cell according to claim 1, wherein: The first limiting portion is arranged on the inner circumferential surface of the connecting member.

3. The battery cell according to claim 1, wherein: The first limiting portion is a first groove, the second limiting portion is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

4. The battery cell according to claim 1, wherein: The connecting piece includes: a first connecting portion connected to the first wall; a second connection portion located on an inner circumference of the first connection portion and further away from the interior of the housing than the first connection portion along a thickness direction of the first wall; a third connecting portion, connecting the first connecting portion and the second connecting portion; Wherein, the first limiting portion is arranged on the inner circumferential surface of the second connecting portion.

5. The battery cell according to claim 1, characterized in that The first insulating member is provided with a third limiting portion, and the electrode terminal is provided with a fourth limiting portion. The third limiting portion cooperates with the fourth limiting portion to limit the circumferential rotation of the electrode terminal relative to the first insulating member.

6. The battery cell according to claim 5, characterized in that Along the radial direction of the electrode terminal, a projection of the third limiting portion at least partially overlaps with a projection of the second limiting portion.

7. The battery cell according to claim 5, characterized in that The electrode terminal includes a first part and a second part. Along the thickness direction of the first wall, the first part is located between the first wall and the connecting member, and the second part is located on the side of the first part away from the interior of the battery cell. The diameter of the second part is smaller than the diameter of the first part, and the fourth limiting portion is arranged on the outer peripheral surface of the second part.

8. The battery cell according to claim 7, characterized in that A first step surface is formed between the second portion and the first portion, and the fourth limiting portion extends to the first step surface.

9. The battery cell according to claim 8, characterized in that The first insulating member has a first end surface abutting against the first step surface, and the third limiting portion is provided on the inner circumferential surface of the first insulating member and extends to the first end surface.

10. The battery cell according to claim 7, characterized in that Along the radial direction of the electrode terminal, a dimension of the fourth limiting portion protruding from the outer circumferential surface of the second portion is smaller than a dimension of the first portion protruding from the outer circumferential surface of the second portion.

11. The battery cell according to claim 7, characterized in that The fourth limiting portion is a second protrusion, the third limiting portion is a second groove, and at least a portion of the second protrusion is embedded in the second groove.

12. The battery cell according to claim 7, characterized in that In a radial direction of the electrode terminal, a portion of the first insulating member is located between an outer peripheral surface of the first portion and the connecting member.

13. The battery cell according to claim 5, characterized in that The connecting member includes a first connecting portion, a second connecting portion, and a third connecting portion, wherein the first connecting portion is connected to the first wall; the second connecting portion is located on the inner circumference of the first connecting portion and is farther away from the interior of the housing than the first connecting portion along the thickness direction of the first wall; and the third connecting portion connects the first connecting portion and the second connecting portion. Wherein, along the radial direction of the electrode terminal, the projections of the fourth limiting portion and the second connecting portion at least partially overlap.

14. The battery cell according to claim 1, characterized in that A third groove is provided on the outer circumferential surface of the first insulating member. The third groove extends along the circumferential direction of the first insulating member. A portion of the connecting member is embedded in the third groove. The second limiting portion is provided on the bottom surface of the third groove.

15. The battery cell according to any one of claims 1 to 14, characterized in that: A recess is provided on an outer surface of the first wall, and a portion of the electrode terminal is located in the recess.

16. The battery cell according to claim 15, 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.

17. The battery cell according to claim 16, characterized in that The convex portion includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connects the bottom wall and the main body, and the first through hole is provided in the bottom wall.

18. The battery cell according to claim 17, characterized in that The connecting member is welded and fixed to the first wall to form a first welding portion. Along the thickness direction of the first wall, a projection of the first welding portion at least partially overlaps with a projection of the peripheral wall.

19. The battery cell according to claim 15, characterized in that The battery cell further includes a first sealant disposed in the recess. The outer peripheral surface of the electrode terminal has a first pressing surface. Along the radial direction of the electrode terminal, the first sealant is configured to be sandwiched between the first pressing surface and the inner peripheral surface of the recess.

20. The battery cell according to claim 19, 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.

21. The battery cell according to claim 19, characterized in that The electrode terminal has a second pressing surface, which is arranged opposite to the bottom surface of the recess along the thickness direction of the first wall. 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.

22. The battery cell according to claim 21, characterized in that 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 outer surface of the first wall and the second pressing surface.

23. The battery cell according to claim 1, characterized in that The battery cell further includes a second sealant, at least a portion of which is disposed between the electrode terminal and the first wall along a thickness direction of the first wall.

24. The battery cell according to claim 1, characterized in that The battery cell further includes a third sealant, at least a portion of which is disposed between the electrode terminal and the connector in a radial direction of the electrode terminal.

25. The battery cell according to claim 1, characterized in that The connecting member is welded to the first wall; Or the connecting member is integrally formed with the first wall.

26. The battery cell according to claim 1, 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.

27. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 26.

28. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 26 or the battery according to claim 27, wherein the battery cell or the battery is used to provide electrical energy.

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