Battery cell, battery, and electrical device

Abstract

A battery cell (200), a battery (B), and an electrical device. The battery cell (200) is provided with a battery shell (220); a pole assembly (100) is arranged on a first wall (210) of the battery shell (220); and the pole assembly (100) comprises a pole body (110), wherein the pole body (110) comprises: a bearing portion (111), the bearing portion (111) passing through a mounting hole (211) of the first wall (210); and a bent portion (112), the bent portion (112) being connected to one end of the bearing portion (111) in the central axis direction (C), bent relative to the bearing portion (111), and arranged on one side of the first wall (210), and the bending strength of the bent portion (112) being smaller than that of the bearing portion (111). The battery (B) comprises the battery cell. The electrical device comprises the battery (B).

Description

Battery cells, batteries and electrical equipment

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to a Chinese application with application number 202322470098.4 and filing date September 12, 2023. The disclosure contents of the above-mentioned Chinese application are hereby introduced into this disclosure as a whole. Technical Field

[0003] 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

[0004] 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.

[0005] In related technologies, the electrical connection between the interior and exterior of a battery cell is achieved through a terminal assembly. When attaching the terminal assembly to a battery cell, such as by riveting, poor riveting can sometimes occur. This poor riveting of the terminal assembly can directly impact the safety and reliability of the battery cell and the battery containing it. Therefore, whether the terminal assembly can be successfully riveted to the battery cell has become an issue.

[0006] Summary of the Invention

[0007] In view of the above problems, one of the purposes of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, which can help to smoothly set the pole assembly on the battery cell through riveting and other methods to improve the yield rate when setting the pole assembly.

[0008] In the first aspect, the present application provides a battery cell having a battery shell, wherein a pole assembly is arranged on the first wall of the battery shell, and the pole assembly includes a pole body, wherein the pole body includes: a receiving portion, the receiving portion is passed through the mounting hole of the first wall; and a bending portion, the bending portion is connected to one end portion in the central axis direction of the receiving portion and is bent relative to the receiving portion and is arranged on one side of the first wall, and the bending strength of the bending portion is less than the bending strength of the receiving portion.

[0009] In the battery cell of the present disclosure, because the bending strength of the bent portion of the terminal body is weaker than that of the receiving portion, the bent portion is more easily bent by riveting than the receiving portion when the terminal body is riveted. In this case, the bent portion can be bent and connected to the first wall of the battery cell without applying excessive riveting pressure, which can facilitate the smooth installation of the terminal assembly on the first wall of the battery cell through riveting or other methods. In addition, it can also help reduce the possibility of components around the terminal body being crushed due to excessive riveting pressure, thereby improving the yield rate when installing the terminal assembly.

[0010] In some embodiments, the minimum thickness of the receiving portion is greater than the maximum thickness of the bending portion.

[0011] By making the minimum thickness of the receiving portion greater than the maximum thickness of the bent portion, the bending strength of the bent portion can be made smaller than the bending strength of the receiving portion. Furthermore, when riveting the pole body, the bent portion can be bent and connected to the first wall of the battery casing without applying excessive riveting pressure, which can help reduce the problem of poor riveting caused by applying excessive riveting pressure.

[0012] In some embodiments, the ratio of the maximum thickness of the bending portion to the minimum thickness of the receiving portion is greater than 0 and within a range of 0.85.

[0013] By making the ratio of the maximum thickness of the bending portion to the minimum thickness of the receiving portion greater than 0 and within 0.85, it is possible to effectively ensure that the bending strength of the bending portion is less than the bending strength of the receiving portion, thereby making it easier for the bending portion to bend and deform relative to the receiving portion during the riveting process.

[0014] In some embodiments, the ratio of the maximum thickness of the bending portion to the minimum thickness of the receiving portion is in the range of 0.3 to 0.7.

[0015] By making the ratio of the maximum thickness of the bending part to the minimum thickness of the receiving part within the range of 0.3 to 0.7, it is possible to further effectively ensure that the bending strength of the bending part is less than the bending strength of the receiving part. Therefore, during the riveting process, it is possible to more reliably ensure that the bending part is more likely to bend and deform relative to the receiving part.

[0016] In some embodiments, a thinning groove is provided on at least one side of the bending portion in a direction substantially perpendicular to the central axis.

[0017] By providing a thinning groove on at least one side of the bending portion in a direction substantially perpendicular to the central axis, the bending strength of the bending portion can be made less than the bending strength of the receiving portion, making the bending portion more susceptible to bending deformation relative to the receiving portion. At the same time, when a thinning groove is provided on the outside of the bending portion in a direction substantially perpendicular to the central axis, a convex table is formed between the receiving portion and the outer peripheral surface of the bending portion, that is, a convex table is formed on the outer peripheral surface of the pole body, and the convex table can provide positioning support for the bending portion when riveting the bending portion. On the other hand, when a thinning groove is provided on the inside of the bending portion in a direction substantially perpendicular to the central axis, a convex table is formed between the receiving portion and the inner peripheral surface of the bending portion. Therefore, for example, when riveting, the convex table between the receiving portion and the bending portion can provide support for the rivet, which can reduce the possibility of the rivet moving further and deforming the receiving portion.

[0018] In some embodiments, an anti-bending reinforcement portion is provided on the receiving portion.

[0019] By providing a bending reinforcement portion at the receiving portion, the bending strength of the receiving portion can be enhanced. Therefore, even if a large force is applied to the pole body in order to reliably bend the bending portion, the bending reinforcement portion will support the receiving portion, and the receiving portion will not produce a large deformation, causing the surrounding components to be crushed, which can improve the yield rate when setting the pole assembly.

[0020] In some embodiments, the anti-bending reinforcement portion includes a flange portion extending from an inner surface of the receiving portion toward a center of the receiving portion.

[0021] Since the anti-bending reinforcement portion provided on the receiving portion includes a flange portion extending from the inner surface of the receiving portion toward the center of the receiving portion, the flange portion can help reduce the bending deformation of the receiving portion when the receiving portion is subjected to a force in a direction substantially perpendicular to the direction of the central axis. This can help ensure that the receiving portion does not undergo significant deformation during riveting.

[0022] In some embodiments, the flange portion is disposed on the inner surface of the receiving portion in a surrounding manner.

[0023] Since the flange portion is arranged on the inner surface of the receiving portion in a circumferential manner, the receiving portion can be uniformly reinforced in the circumferential direction of the receiving portion, which can help reduce the possibility of uneven deformation of the receiving portion.

[0024] In some embodiments, in the direction of the central axis, there is a certain distance between the flange portion and the end of the receiving portion away from the bending portion.

[0025] Since the flange portion and the end portion of the supporting portion are at a certain distance away from the bending portion in the direction of the central axis, when the bending portion is riveted, when a force in a direction roughly perpendicular to the central axis direction of the supporting portion acts on the supporting portion to cause the supporting portion to expand and bend, the flange portion can effectively pull the supporting portion and prevent it from expanding, thereby effectively improving the bending strength of the supporting portion.

[0026] In some embodiments, at least a portion of the flange portion is located within the mounting hole.

[0027] Since at least part of the flange portion is located in the mounting hole, that is, the flange portion and the first wall at least partially overlap in a direction substantially perpendicular to the central axis direction of the receiving portion, therefore, when a large riveting pressure is applied so that the receiving portion is intended to expand and bend, the flange portion and the first wall of the battery housing can work together to resist the outward expansion of the receiving portion, thereby effectively improving the bending strength of the receiving portion.

[0028] In some embodiments, the pole body further includes a holding portion connected to the receiving portion, the holding portion and the bent portion are respectively arranged on both sides of the first wall, and the flange portion is spaced apart from the holding portion.

[0029] By adopting such a structure, the electrode body can be stably set on the first wall of the battery case by utilizing the retaining portion and the bending portion. In addition, since the flange portion and the retaining portion are spaced apart, when the bending portion is riveted, the flange portion can effectively resist the force generated by riveting that causes the receiving portion and the retaining portion to expand and bend, thereby effectively improving the bending strength of the receiving portion and the retaining portion.

[0030] In some embodiments, the anti-bending reinforcement portion includes a reinforcement rib provided on the inner side of the receiving portion, wherein the reinforcement rib extends in the direction of the central axis and is provided in plurality at intervals along the circumference of the receiving portion.

[0031] By providing reinforcing ribs on the inner side of the receiving portion, extending the reinforcing ribs in the direction of the central axis and providing a plurality of reinforcing ribs at intervals along the circumference of the receiving portion, the reinforcing ribs can be used to effectively resist the force that causes the receiving portion to expand in a direction roughly perpendicular to the direction of the central axis.

[0032] In some embodiments, the reinforcing rib extends to the connecting portion between the receiving portion and the bending portion.

[0033] Since the reinforcing rib extends to the connection portion between the receiving portion and the bent portion, that is, one end portion of the reinforcing rib corresponds to the end portion of the receiving portion connected to the bent portion, the reinforcing rib can be used to effectively resist the force that causes the receiving portion to expand in a direction roughly perpendicular to the direction of the central axis. For example, when riveting is performed using rivets, the end face of the reinforcing rib can also provide support for the rivet, thereby reducing the possibility of the rivet moving further forward and causing deformation of the receiving portion.

[0034] In some embodiments, a weakened portion is provided at a connection portion between the bending portion and the receiving portion, and the bending portion is bent from the weakened portion.

[0035] By providing a weakened anti-bending portion at the connection portion between the bending portion and the receiving portion, and making the bending portion bend from the weakened anti-bending portion, the possibility of the receiving portion being greatly deformed due to riveting pressure can be effectively reduced.

[0036] In some embodiments, the weakened portion is a bending groove or a connecting piece made of a material with lower bending strength.

[0037] By providing a bending groove at the connection between the bent portion and the receiving portion, the bent portion is easily bent outward when subjected to riveting pressure. The bending groove can also accommodate the deformation of the bent portion during riveting, thereby improving the riveting strength and riveting efficiency of the bent portion and improving the riveting yield rate. In addition, by providing a connector made of a material with lower bending strength at the connection between the bent portion and the receiving portion, it can be effectively ensured that the bent portion is more easily bent and deformed than the receiving portion when subjected to riveting pressure.

[0038] In some embodiments, the pole assembly also includes a first insulating member surrounding the outside of the pole body, the first insulating member includes a first part and a second part, the first part is inserted into the mounting hole of the first wall, the second part is connected to the first part, and the second part is clamped between the bent portion and the first wall.

[0039] By surrounding the outside of the terminal body with the first portion of the first insulating member, inserting the first portion of the first insulating member into the mounting hole of the first wall, and sandwiching the second portion between the bent portion and the first wall, the first insulating member can reliably insulate the terminal body from the first wall of the battery housing, thereby improving the safety and reliability of the battery cell. In addition, because the second portion of the first insulating member can also provide support when the bent portion is compressed, the bent portion can be reliably positioned on the first wall of the battery housing.

[0040] In some embodiments, the inner circumference of the second portion is larger than the inner circumference of the first portion.

[0041] By making the inner circumference of the second portion larger than the inner circumference of the first portion, when the first insulating member surrounds the outside of the pole body, the second portion is separated from the pole body. Therefore, when riveting, the deformation of the receiving portion and the bent portion during riveting can be accommodated, which helps to reduce the possibility of excessive stress concentration and cracking the first insulating member, and can effectively improve the riveting efficiency of the pole assembly.

[0042] In some embodiments, the bending portion is connected to the receiving portion at a connecting surface, the bending portion abuts against a contact surface of the second portion, and in the direction of the central axis, the distance between the connecting surface and the abutting surface is in the range of -5mm to +5mm.

[0043] By making the distance between the connecting surface of the bending portion and the receiving portion and the abutting surface of the second portion within the range of -5mm to +5mm, the problem of insufficient pressing or excessive squeezing due to failure to set the distance between the connecting surface and the abutting surface to an appropriate size can be reduced, thereby improving the yield rate when setting the pole assembly and improving the safety and reliability of the battery cell.

[0044] In some embodiments, the bending portion is connected to the receiving portion at a connecting surface, the bending portion abuts against a contact surface of the second portion, and in the direction of the central axis, a distance between the connecting surface and the abutting surface is in the range of -2 mm to +2 mm.

[0045] By making the distance between the connecting surface of the bending portion and the receiving portion and the abutting surface of the second part within the range of -2mm to +2mm, the problem of insufficient pressing or excessive extrusion caused by not setting the distance between the above-mentioned connecting surface and the abutting surface to an appropriate size can be further effectively reduced. The bending portion can be appropriately bent and set on the first wall of the battery casing, which can further improve the yield rate when setting the pole assembly.

[0046] In some embodiments, a protrusion is formed on the second portion, and the protrusion surrounds the bent portion.

[0047] By using the raised portion formed on the second part to surround the bent portion, the receiving groove defined by the raised portion can be used to accommodate the bent portion after bending. As a result, the probability of the bent portion contacting the first wall of the battery casing after bending can be reduced. The first insulating member can be used to reliably insulate the receiving portion and the bent portion from the first wall of the battery casing, thereby ensuring safety in use.

[0048] In some embodiments, a retaining portion is provided at the other end of the pole body in the direction of the central axis of the receiving portion, and the retaining portion and the bent portion are clamped on both sides of the first wall.

[0049] By providing such a retaining portion, the terminal body can be stably set on the first wall of the battery case using the retaining portion and the bending portion without separation, thereby helping to reduce the possibility of poor contact between the terminal body and the electrode assembly of the battery cell, resulting in unusable battery.

[0050] In some embodiments, the pole assembly further includes a seal, which is disposed between the retaining portion and the first wall to seal the receiving portion and the first wall.

[0051] By arranging a seal between the retaining portion and the first wall of the battery case to seal the receiving portion and the first wall, the gap between the receiving portion and the first wall of the battery case can be sealed, thereby reducing the possibility of electrolyte leakage from the battery cell through the gap between the receiving portion and the first wall of the battery case, and further improving the safety and reliability of the battery cell.

[0052] In some embodiments, the retaining portion is located within a battery housing of the battery cell.

[0053] Because the retaining portion is located within the battery housing of the battery cell, the bent portion disposed on the outer side of the first wall can be conveniently riveted from the outside of the battery cell. Compared to a structure in which the retaining portion is disposed outside the battery housing and the bent portion is disposed within the battery housing, the riveting operation space can be increased.

[0054] In some embodiments, the pole assembly further includes a second insulating member disposed between the retaining portion and the first wall.

[0055] By providing the second insulating member, the holding portion and the first wall of the battery case can be reliably insulated.

[0056] In some embodiments, the battery cell further includes a transition piece, the pole body is fixed to the transition piece, and the transition piece electrically connects the pole body to the electrode assembly of the battery cell.

[0057] By fixing the pole body to the adapter and electrically connecting the pole body to the electrode assembly of the battery cell using the adapter, the pole body can be supported by the adapter while being electrically connected to the electrode assembly, and the pole body can be stably set on the battery cell.

[0058] In some embodiments, the battery housing includes a shell and an end cover, and the first wall is the shell and / or the end cover.

[0059] By adopting such a structure, since the first wall where the terminal body is provided can be the shell and / or end cover of the battery case, the degree of freedom in design can be increased, and the position where the terminal body is provided can be appropriately selected according to needs.

[0060] In a second aspect, the present application provides a battery, wherein the battery includes the battery cell in the above embodiment.

[0061] By having the features of the embodiments of the present application, the provided battery can obtain the benefits described with respect to the battery cells.

[0062] In a third aspect, the present application provides an electric device, comprising the battery in the above embodiment, wherein the battery is configured to supply power to the electric device.

[0063] By having the features of the embodiments of the present application, the provided electric device can obtain the benefits described with respect to the battery cells and the battery.

[0064] 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, it can be implemented in accordance with the contents of the specification. In order to make the above and 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

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0066] FIG1 is a schematic diagram schematically showing the structure of a vehicle as an electric device according to some embodiments of the present disclosure.

[0067] FIG2 is a schematic diagram showing the bottom structure of a vehicle serving as an electric device according to some embodiments of the present disclosure.

[0068] FIG. 3 is an exploded perspective view schematically illustrating a battery cell according to some embodiments of the present disclosure.

[0069] FIG. 4 is a perspective exploded view schematically showing an end cap and a terminal assembly of a battery cell according to some embodiments of the present disclosure.

[0070] FIG5 is a perspective view schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure before being riveted.

[0071] FIG6 is a perspective view schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure after being riveted.

[0072] FIG. 7 is a top view schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure after being riveted.

[0073] FIG8 is a schematic cross-sectional view taken along line AA of FIG7 .

[0074] FIG. 9 is a cross-sectional view corresponding to FIG. 8 , schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure before being riveted.

[0075] FIG10 is a cross-sectional view corresponding to FIG8 , schematically showing the outer wall of the bent portion of the pole body in the pole assembly according to some embodiments of the present disclosure after thinning and before riveting.

[0076] FIG11 is a cross-sectional view corresponding to FIG8 , schematically showing the outer wall of the bent portion of the pole body in the pole assembly of some embodiments of the present disclosure after being thinned and riveted.

[0077] FIG12 is a cross-sectional view corresponding to FIG8 , schematically showing the inner and outer walls of the bent portion of the pole body in the pole assembly of some embodiments of the present disclosure after both the inner and outer walls are thinned and before being riveted.

[0078] FIG13 is a cross-sectional view corresponding to FIG8 , schematically showing the inner and outer walls of the bent portion of the pole body in the pole assembly of some embodiments of the present disclosure after being thinned and riveted.

[0079] 14 is a cross-sectional view corresponding to FIG. 8 , schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure having a weakened portion against bending provided between the bent portion and the receiving portion and before being riveted.

[0080] FIG15 is a cross-sectional view corresponding to FIG8 , schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure having a weakened portion for resisting bending provided between the bending portion and the receiving portion and after being riveted.

[0081] FIG16 is a perspective view schematically showing a pole body in a pole assembly according to some embodiments of the present disclosure having reinforcing ribs provided on a receiving portion.

[0082] FIG. 17 is a schematic diagram schematically showing the structure of the pole body in the pole assembly shown in FIG. 16 after riveting.

[0083] In the drawings, the drawings are not drawn to scale.

[0084] Marking Description:

[0085] D, vehicle; B, battery; CH, chassis; CON, controller; M, motor;

[0086] 200, battery cell; 210, first wall (end cap); 220, battery housing; 230, electrode assembly; 240, negative terminal cap; 250, fixing member; 260, sealing nail;

[0087] 100, pole assembly; 110, pole body; 120, first insulating member; 130, sealing member; 140, adapter; 150, second insulating member; 121, first portion; 122, second portion; 123, raised portion; 124, receiving groove; S1, connecting surface; S2, abutting surface;

[0088] 111, receiving portion; 111a, flange portion; 111b, reinforcing rib; 112, bending portion; 112a, thinning groove; 113, bending groove; 114, retaining portion. DETAILED DESCRIPTION

[0089] 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.

[0090] 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.

[0091] In the description of the embodiments of this application, technical terms such as "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 technical features indicated. In addition, the term "perpendicular" does not mean perpendicular in the strict sense, but rather means within the allowable error range. The term "parallel" does not mean parallel in the strict sense, but rather means within the allowable error range.

[0092] 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.

[0093] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0094] In the description of the embodiments of the present application, the term "multiple" refers to more than two, unless otherwise specifically defined. Similarly, "multiple groups" refers to more than two groups, and "multiple sheets" refers to more than two sheets, unless otherwise specifically defined.

[0095] 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.

[0096] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installation," "connection," "connection," "fixation," and "abutment" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0097] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0098] Regarding the battery cells included in a battery, the inventors have noted that in structures where the internal and external electrical connections of the battery cells are achieved through terminal assemblies, when the terminal assemblies are attached to the battery housing of the battery cells, for example, by riveting, poor riveting can sometimes occur, such as cracking of the first insulating member and dimensional deformation of the receiving portion provided with the injection hole. Since poor riveting of the terminal assemblies can directly affect the safety and reliability of the battery cells and the batteries containing them, the question of whether the terminal assemblies can be successfully riveted to the battery cells has become an issue.

[0099] In order to smoothly rivet the terminal assembly to the battery cell and minimize the problems caused by poor riveting, the inventors of this application discovered, after research, that the main reason for this problem is that during the riveting process, when the bent portion of the terminal body is riveted to fix the terminal assembly to the battery cell, the bent portion is not easily bent. In such cases, the riveting pressure is usually increased to force the bent portion to bend. However, excessive riveting pressure can cause deformation of the receiving portion in the terminal body and sometimes even cause parts such as the first insulating member and seal disposed on the periphery of the terminal body to be crushed and fail. In response to this, the inventors, after in-depth research, considered reducing the bending strength of the bent portion in the terminal body and / or increasing the bending strength of the receiving portion in the terminal body. This allows the bent portion of the terminal body to be smoothly bent and connected to the battery cell during the riveting process, thereby achieving the fixation of the terminal assembly relative to the battery cell.

[0100] Based on the above considerations, in order to smoothly set the pole assembly by riveting and the like and improve the yield rate when setting the pole assembly, the inventors designed a battery cell, which has a battery shell, and a pole assembly is provided on the first wall of the battery shell, and the pole assembly includes a pole body, wherein the pole body includes: a receiving portion, the receiving portion is passed through the mounting hole of the first wall; and a bending portion, the bending portion is connected to one end portion in the central axis direction of the receiving portion and is bent relative to the receiving portion and is provided on one side of the first wall, and the bending strength of the bending portion is less than the bending strength of the receiving portion.

[0101] In the new battery cell proposed by the inventors, because the bending strength of the bent portion of the terminal body is weaker than that of the receiving portion, the bent portion is more easily bent by riveting than the receiving portion when the terminal body is riveted. In this case, the bent portion can be bent and connected to the first wall of the battery cell without applying excessive riveting pressure, which can facilitate the smooth installation of the terminal assembly on the first wall of the battery cell through riveting or other methods. In addition, it can help reduce the possibility of components around the terminal body being crushed due to excessive riveting pressure, thereby improving the yield rate when installing the terminal assembly.

[0102] In addition, the embodiments of the present disclosure further provide a battery having the battery cell and an electrical device having the battery.

[0103] An embodiment of the present disclosure provides an electrical device using a battery as a power source, wherein the battery is configured to provide electrical energy to the electrical device. The electrical device may be, but is not limited to, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer.

[0104] The battery mentioned in the embodiments of the present disclosure may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid through a busbar.

[0105] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0106] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0107] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0108] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0109] For the convenience of explanation, the following description will be made by taking a vehicle D, an electrical device according to some embodiments of the present disclosure, as an example.

[0110] Please refer to Figures 1 and 2. Figure 1 is a schematic diagram illustrating the structure of a vehicle D provided in some embodiments of the present disclosure. Vehicle D can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery B is provided inside vehicle D. Battery B can be located at the bottom, head, or tail of vehicle D. Battery B can be used to power vehicle D, for example, as an operating power source for vehicle D.

[0111] Figure 2 shows the underbody structure of the vehicle shown in Figure 1 . A battery B can be installed on the chassis CH of the vehicle D. The vehicle D also includes a controller CON and a motor M. The battery B provides power to the motor M and other components of the vehicle D. The controller CON controls the operation of the motor M, for example, to meet the power requirements for starting, navigation, and driving the vehicle D.

[0112] In some embodiments of the present disclosure, battery B can serve not only as an operating power source for vehicle D, but also as a driving power source for vehicle D, replacing or partially replacing fuel or natural gas to provide driving power for vehicle D.

[0113] Some embodiments of the present disclosure provide a battery B, for example, comprising a housing and battery cells housed within the housing. The housing comprises a housing shell and a lid that snaps onto the housing shell, providing a space for the battery cells. The housing can be a rectangular parallelepiped or have other shapes, such as a cylinder. The lid can overlap the housing shell to define a space for the battery cells. Furthermore, the connection between the housing shell and the lid can be sealed using a sealing member, such as a sealing ring or sealant.

[0114] Battery B may contain multiple battery cells, which can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, parallel, or in a hybrid configuration, and then housed within a housing.

[0115] In some embodiments, battery B may be a battery pack formed by connecting multiple battery cells in series, parallel, or hybrid. The battery pack may be in the form of a battery module. The multiple battery packs are then connected in series, parallel, or hybrid to form a whole unit, which is then housed in a housing.

[0116] Battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the present disclosure does not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, and the present disclosure does not limit this. Battery cells are generally divided into three types based on packaging: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the present disclosure does not limit this.

[0117] 3 to 17 , an embodiment of the present application provides a battery cell 200 having a battery housing 220, wherein a pole assembly 100 is provided on the first wall 210 of the battery housing 220. The pole assembly 100 includes a pole body 110, and the pole body 110 includes a receiving portion 111 and a bending portion 112. The receiving portion 111 is passed through the mounting hole 211 of the first wall 210. The bending portion 112 is connected to one end portion of the receiving portion 111 in the direction C of the central axis, for example, and is bent relative to the receiving portion 111 and is provided on one side of the first wall 210. The bending strength of the bending portion 112 is less than the bending strength of the receiving portion 111.

[0118] The battery cell 200 is a basic unit for realizing the mutual conversion of chemical energy and electrical energy. As mentioned above, each battery cell 200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 200 can be cylindrical, flat, rectangular or other shapes. The battery cell 200 includes, for example, a battery housing 220 and an electrode assembly 230, and the electrode assembly 230 can be housed in the battery housing 220. The electrode assembly 230 can include a positive electrode sheet, a negative electrode sheet and a separator. It can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet. In addition, one or more electrode assemblies 230 can be stacked in the battery housing 220.

[0119] Optionally, the battery cell 200 further includes an end cap, which can seal the opening of the battery housing 220 and become integral with the battery housing 220. Optionally, a terminal assembly 100 is provided on the first wall 210 of the battery housing 220. The first wall 210 can be any side wall of the battery housing 220 or an end cap provided on the battery housing 220.

[0120] The electrode assembly 100 is used to electrically connect the electrode assembly 230 within the battery cell 200 to the outside. It is mounted on the first wall 210 of the battery housing 220, for example, by riveting or other means. The electrode assembly 100 includes at least a electrode body 110. Optionally, the electrode assembly 100 may further include a first insulating member for insulating the electrode body 110 from the first wall 210, a sealing member for preventing the outflow of electrolyte, a second insulating member for insulating the electrode body 110 from the first wall 210, and the like.

[0121] The pole body 110 in the pole assembly 100, for example, includes at least a receiving portion 111 and a bending portion 112. The receiving portion 111 is the portion of the mounting hole 211 that is provided in the first wall 210 when the pole assembly 100 is provided in the first wall 210. Optionally, the receiving portion 111 is provided with, for example, an injection hole for injecting electrolyte. The receiving portion 111 does not generate bending deformation during the riveting process or only generates smaller bending deformation compared to the bending portion 112. This can help ensure that the size of the injection hole and the like provided in the receiving portion 111 does not change excessively. In addition, for example, the possibility of the first insulating member, sealing member, etc. around the receiving portion 111 being crushed due to the deformation of the receiving portion 111 can be effectively reduced.

[0122] The bending portion 112 is a portion that is riveted and bent when the pole assembly 100 is set on the first wall 210. As shown in Figures 8 to 15, optionally, the bending portion 112 is connected to an end portion in the direction C of the central axis of the receiving portion 111, for example, it can be formed integrally with the receiving portion 111. By bending the bending portion 112 relative to the receiving portion 111 and setting it on one side of the first wall 210, the pole assembly 100 is set as a whole on the first wall 210. In the pole assembly 100 of the embodiment of the present application, the bending strength of the bending portion 112 is less than the bending strength of the receiving portion 111, thereby making the bending portion 112 more susceptible to bending deformation than the receiving portion 111.

[0123] The central axis direction C of the receiving portion 111 refers to a direction passing through the center position of the cross section of the receiving portion 111 and being substantially parallel to the extension direction of the receiving portion 111. In addition, in some embodiments, the central axis direction C is also a direction substantially perpendicular to the connecting surface between the receiving portion 111 and the bent portion 112. In this specification, unless otherwise specified, the central axis direction C of the receiving portion 111 is synonymous with the axial direction or length direction of the receiving portion 111, and the direction substantially perpendicular to the central axis direction C of the receiving portion 111 is synonymous with the cross-sectional direction of the receiving portion 111.

[0124] In the embodiment of the present application, "bending strength" refers to the degree of difficulty of the component to bend and deform relative to the axial direction when the component (including a part of the component) is subjected to a force in a direction substantially perpendicular to the axial direction. For example, the greater the bending strength of the component, the less likely the component is to bend and deform relative to the axial direction when subjected to the same force in a direction substantially perpendicular to the axial direction. The bending strength depends, for example, on the properties of the component material itself and / or the shape characteristics of the component. In the pole assembly 100 of the embodiment of the present application, as described above, since the bending strength of the bending portion 112 is less than the bending strength of the receiving portion 111, when the pole assembly 100 is riveted, the bending portion 112 is more likely to bend and deform than the receiving portion 111.

[0125] Optionally, the bent portion 112 is bent to form an angle with the central axis direction C of the receiving portion 111 exceeding a predetermined angle and is disposed on one side of the first wall 210. This process is sometimes referred to as "flanging the bent portion 112." Alternatively, the bent portion 112 can be bent to abut against one side of the first wall 210, for example, by riveting or other methods.

[0126] In the battery cell 200 of this embodiment, because the bending strength of the bent portion 112 in the electrode body 110 is lower than that of the receiving portion 111, when the electrode body 110 is riveted, the bent portion 112 is more easily bent by riveting than the receiving portion 111. In this case, the bent portion 112 can be bent and connected to the first wall 210 of the battery cell 200 without applying excessive riveting pressure, which can help to smoothly install the electrode assembly 100 on the first wall 210 of the battery cell 200 through riveting or other methods. In addition, it can also help to reduce the possibility of components around the electrode body 110 being crushed due to excessive riveting pressure, and can improve the yield rate when installing the electrode assembly 100.

[0127] 9 to 12 , according to some embodiments of the present application, optionally, the minimum thickness t1 of the receiving portion 111 is greater than the maximum thickness t2 of the bending portion 112 .

[0128] The minimum thickness t1 of the receiving portion 111 refers to the thickness of the thinnest portion of the receiving portion 111 in the cross section along the central axis direction C. The maximum thickness t2 of the bent portion 112 refers to the thickness of the thickest portion of the bent portion 112 in a cross section substantially perpendicular to its extending direction.

[0129] By making the minimum thickness t1 of the receiving portion 111 in a direction roughly perpendicular to the central axis direction C greater than the maximum thickness t2 of the bending portion 112, the bending strength of the bending portion 112 can be made smaller than the bending strength of the receiving portion 111. Therefore, when riveting the pole body 110, the bending portion 112 can be bent and connected to the first wall 210 of the battery housing 220 without applying excessive riveting pressure, which can help reduce the problem of poor riveting caused by applying excessive riveting pressure.

[0130] According to some embodiments of the present application, optionally, the ratio of the maximum thickness t2 of the bending portion 112 to the minimum thickness t1 of the receiving portion 111 is greater than 0 and within a range of 0.85.

[0131] By making the ratio of the maximum thickness t2 of the bending portion 112 to the minimum thickness t1 of the receiving portion 111 greater than 0 and within 0.85, it is possible to effectively ensure that the bending strength of the bending portion 112 is less than the bending strength of the receiving portion 111, thereby making it easier for the bending portion 112 to bend and deform relative to the receiving portion 111 during the riveting process.

[0132] According to some embodiments of the present application, optionally, the ratio of the maximum thickness t2 of the bending portion 112 to the minimum thickness t1 of the receiving portion 111 is in the range of 0.3 to 0.7.

[0133] By making the ratio of the maximum thickness t2 of the bending portion 112 to the minimum thickness t1 of the receiving portion 111 within the range of 0.3 to 0.7, it is possible to further effectively ensure that the bending strength of the bending portion 112 is less than the bending strength of the receiving portion 111. Therefore, during the riveting process, it is possible to more reliably ensure that the bending portion 112 is more likely to bend and deform relative to the receiving portion 111.

[0134] 8 to 9 , according to some embodiments of the present application, optionally, a thinning groove 112 a is provided on at least one side of the bending portion 112 in a direction substantially perpendicular to the central axis direction C.

[0135] The thinning groove 112a is obtained, for example, by removing a portion of at least one of the inner and outer sides of the bent portion 112, so that the maximum thickness t2 of the bent portion 112 is smaller than the minimum thickness t1 of the receiving portion 111. For example, when observed in a direction substantially perpendicular to the central axis direction C, the outer circumference of the receiving portion 111 can be the same as that of the bent portion 112 before bending, and the inner circumference of the receiving portion 111 can be smaller than that of the bent portion 112 before bending, as shown in FIG9 ; the inner circumference of the receiving portion 111 can be the same as that of the bent portion 112 before bending, and the outer circumference of the receiving portion 111 can be larger than that of the bent portion 112 before bending, as shown in FIG10 ; or the outer circumference of the receiving portion 111 can be larger than that of the bent portion 112 before bending, and the inner circumference of the receiving portion 111 can be smaller than that of the bent portion 112 before bending, as shown in FIG12 .

[0136] In the above description, the outer peripheral size refers to, for example, the circumference of the outer peripheral surface in a direction approximately perpendicular to the central axis direction C. Correspondingly, the inner peripheral size refers to, for example, the circumference of the inner peripheral surface in a direction approximately perpendicular to the central axis direction C. In some embodiments, the outer peripheral size may correspond to the outer diameter size, and the inner peripheral size may correspond to the inner diameter size.

[0137] By providing a thinning groove 112a on at least one side of the bent portion 112 in a direction substantially perpendicular to the central axis direction C, the bending strength of the bent portion 112 can be made smaller than the bending strength of the receiving portion 111, making it easier for the bent portion 112 to bend and deform relative to the receiving portion 111. At the same time, when the thinning groove 112a is provided on the outer side of the bent portion 112 in a direction substantially perpendicular to the central axis direction C, a convex surface is formed between the outer circumferential surface of the receiving portion 111 and the bent portion 112, that is, a convex surface is formed on the outer circumferential surface of the pole body 110. When the bent portion 112 is riveted, the convex surface can provide positioning support for the bent portion 112. On the other hand, when a thinning groove 112a is provided on the inner side of the bending portion 112 in a direction approximately perpendicular to the central axis direction C, a boss surface will be formed between the receiving portion 111 and the inner peripheral surface of the bending portion 112. Therefore, for example, during riveting, the boss surface between the receiving portion 111 and the bending portion 112 can provide support for the rivet, thereby reducing the possibility of the rivet moving further forward and causing the receiving portion 111 to deform.

[0138] 8 to 15 , according to some embodiments of the present application, optionally, a bending reinforcement portion is provided on the receiving portion 111 .

[0139] The anti-bending reinforcement portion provided on the receiving portion 111 refers to a portion that can further ensure that the anti-bending strength of the receiving portion 111 is greater than the anti-bending strength of the bending portion 112. In some embodiments, the anti-bending reinforcement portion can be provided on the receiving portion 111 in one piece or in a separate piece, so that when the receiving portion 111 is subjected to a force in a direction substantially perpendicular to the central axis direction C, it can resist the force without bending and deforming compared to the bending portion 112. The anti-bending reinforcement portion is not particularly limited as long as it can strengthen the anti-bending strength of the receiving portion 111. In addition, the anti-bending reinforcement portion can be provided on the outside of the receiving portion 111 or on the inside of the receiving portion 111 and is not particularly limited.

[0140] By providing a bending reinforcement portion on the receiving portion 111, the bending strength of the receiving portion 111 can be enhanced. Therefore, even if a large force is applied to the pole body 110 in order to reliably bend the bending portion 112, the bending reinforcement portion will support the receiving portion 111, and the receiving portion 111 will not produce a large deformation to cause the surrounding components to be crushed, which can improve the yield rate when setting the pole assembly 100.

[0141] 8 to 15 , according to some embodiments of the present application, optionally, the anti-bending reinforcement portion includes a flange portion 111 a extending from an inner surface of the receiving portion 111 toward a center of the receiving portion 111 .

[0142] The flange portion 111a refers to a protruding portion extending from the inner surface of the receiving portion 111 toward the center of the receiving portion 111. Optionally, the flange portion 111a can be configured to have the same size as the receiving portion 111 in the central axis direction C, or can be configured to have a size smaller than the receiving portion 111 in the central axis direction C, or can be configured to be formed with multiple portions spaced apart in the central axis direction C. As long as the flange portion 111a can improve the bending strength of the receiving portion 111, its specific configuration is not particularly limited. In some embodiments, optionally, the flange portion 111a encloses a liquid injection hole.

[0143] Since the anti-bending reinforcement portion provided on the receiving portion 111 includes a flange portion 111a extending from the inner surface of the receiving portion 111 toward the center of the receiving portion 111, the flange portion 111a can help reduce the bending deformation of the receiving portion 111 when the receiving portion 111 is subjected to a force in a direction substantially perpendicular to the center axis direction C. This can help ensure that the receiving portion 111 does not undergo significant deformation during riveting.

[0144] According to some embodiments of the present application, optionally, the flange portion 111 a is disposed on the inner surface of the receiving portion 111 in a completely surrounding manner.

[0145] Since the flange portion 111 a is disposed on the inner surface of the receiving portion 111 in a circumferential manner, the receiving portion 111 can be uniformly reinforced in the circumferential direction of the receiving portion 111 , which can help reduce the possibility of uneven deformation of the receiving portion 111 .

[0146] 8 to 15 , according to some embodiments of the present application, optionally, in the direction C of the central axis, the flange portion 111 a and the end of the receiving portion 111 away from the bending portion 112 have a certain distance therebetween.

[0147] The end of the receiving portion 111 away from the bent portion 112 refers to the end of the receiving portion 111 on the opposite side of the bent portion 112. When the flange portion 111a is at a certain distance from the end of the receiving portion 111, the flange portion 111a is closer to the part of the pole body 110 that is riveted by a component such as a rivet.

[0148] Since the flange portion 111a and the end of the receiving portion 111 away from the bending portion 112 are at a certain distance in the center axis direction C, when the bending portion 112 is riveted, when a force in a direction roughly perpendicular to the center axis direction C of the receiving portion 111 acts on the receiving portion 111 to expand and bend the receiving portion 111, the flange portion 111a can effectively pull the receiving portion 111 and prevent it from expanding, thereby effectively improving the bending strength of the receiving portion 111.

[0149] 8 to 15 , according to some embodiments of the present application, optionally, at least a portion of the flange portion 111 a is located within the mounting hole 211 .

[0150] At least part of the flange portion 111a is located in the mounting hole 211 means that: when the pole assembly 100 is arranged on the first wall 210, the receiving portion 111 of the pole body 110 is passed through the mounting hole 211 of the first wall 210. In this state, in a direction substantially perpendicular to the center axis direction C, the flange portion 111a provided on the receiving portion 111 at least partially overlaps with the first wall 210.

[0151] Since at least part of the flange portion 111a is located in the mounting hole 211, that is, the flange portion 111a and the first wall 210 at least partially overlap in a direction roughly perpendicular to the central axis direction C of the receiving portion 111, therefore, when a large riveting pressure is applied to cause the receiving portion 111 to expand and bend, the flange portion 111a and the first wall 210 of the battery housing 220 can work together to resist the outward expansion of the receiving portion 111, which can effectively improve the bending strength of the receiving portion 111.

[0152] According to some embodiments of the present application, optionally, the pole body 110 further includes a retaining portion 114 connected to the receiving portion 111 , the retaining portion 114 and the bending portion 112 are respectively arranged on both sides of the first wall 210 , and the flange portion 111 a is spaced apart from the retaining portion 114 .

[0153] In some embodiments, the pole body 110 further includes a retaining portion 114 connected to the end of the receiving portion 111 opposite the bent portion 112. Optionally, the retaining portion 114 may extend in a direction substantially perpendicular to the central axis direction C. The retaining portion 114 and the bent portion 112 are arranged to sandwich the first wall 210, allowing the pole body 110 to be entirely disposed on the first wall 210. Optionally, the flange portion 111a is spaced apart from the retaining portion 114 by a predetermined distance.

[0154] By adopting such a structure, the pole body 110 can be stably set on the first wall 210 of the battery shell 220 by utilizing the retaining portion 114 and the bending portion 112. In addition, since the flange portion 111a is spaced apart from the retaining portion 114, when the bending portion 112 is riveted, the flange portion 111a can effectively resist the force generated by riveting that causes the receiving portion 111 and the retaining portion 114 to expand and bend, thereby effectively improving the bending strength of the receiving portion 111 and the retaining portion 114.

[0155] 16 to 17 , according to some embodiments of the present application, optionally, the anti-bending reinforcement portion includes a reinforcing rib 111b arranged on the inner side of the receiving portion 111 , the reinforcing rib 111b extends in the direction C of the central axis, and a plurality of the reinforcing ribs 111b are arranged at intervals along the circumference of the receiving portion 111 .

[0156] The reinforcing rib 111b provided inside the receiving portion 111 and extending in the central axis direction C may extend directly from the receiving portion 111 or be provided on a flange formed on the inner surface of the receiving portion 111. Optionally, a plurality of reinforcing ribs 111b are provided at intervals along the circumference of the receiving portion 111.

[0157] By providing reinforcing ribs 111b on the inner side of the receiving portion 111, and extending the reinforcing ribs 111b in the center axis direction C and providing a plurality of reinforcing ribs 111b at intervals along the circumference of the receiving portion 111, the reinforcing ribs 111b can be utilized to effectively resist the force that causes the receiving portion 111 to expand in a direction roughly perpendicular to the center axis direction C.

[0158] According to some embodiments of the present application, optionally, the reinforcing rib 111b extends to the connection portion between the receiving portion 111 and the bending portion 112 .

[0159] The reinforcing rib 111b extending to the connection portion between the receiving portion 111 and the bending portion 112 means that the reinforcing rib 111b extends in the central axis direction C, and the end face of the reinforcing rib 111b is substantially flush with the plane where the connection portion between the receiving portion 111 and the bending portion 112 is located.

[0160] Since the reinforcing rib 111b extends to the connection portion between the receiving portion 111 and the bending portion 112, that is, one end portion of the reinforcing rib 111b corresponds to the end portion of the receiving portion 111 connected to the bending portion 112, the reinforcing rib 111b can be used to effectively resist the force that causes the receiving portion 111 to expand in a direction roughly perpendicular to the central axis direction C. For example, when riveting is performed using rivets, the end face of the reinforcing rib 111b can also provide support for the rivet, thereby reducing the possibility of the rivet moving further forward and deforming the receiving portion 111.

[0161] 14 and 15 , according to some embodiments of the present application, optionally, a weakened anti-bending portion is provided at the connection portion between the bending portion 112 and the receiving portion 111 , and the bending portion 112 is bent from the weakened anti-bending portion.

[0162] The anti-bending weakened portion provided at the connection portion between the bending portion 112 and the receiving portion 111 refers to a portion that can further ensure that the bending portion 112 is easy to bend when performing operations such as riveting. In some embodiments, the anti-bending weakened portion can be realized by designing the shape and / or material of the connection portion between the bending portion 112 and the receiving portion 111. For example, a notch, i.e., a bending groove, can be provided at the connection portion between the bending portion 112 and the receiving portion 111 to form the anti-bending weakened portion, or a connecting piece can be made of a material having a bending strength at least lower than that of the receiving portion 111 and the bending portion 112 and the receiving portion 111 are connected on both sides of the connecting piece to achieve the desired effect. The anti-bending weakened portion is not particularly limited as long as it can make the bending portion 112 easy to bend.

[0163] By providing a weakened anti-bending portion at the connection between the bending portion 112 and the receiving portion 111 and bending the bending portion 112 from the weakened anti-bending portion, the possibility of the receiving portion 111 being greatly deformed due to riveting pressure can be effectively reduced.

[0164] According to some embodiments of the present application, optionally, the weakened portion against bending is a bending groove 113 or a connecting piece made of a material with lower bending strength.

[0165] The bending groove 113 refers to a notch formed at the connection between the bending portion 112 and the receiving portion 111. It can be a V-shaped notch formed by a flat surface or a notch with a curved surface. The connector made of a material with a relatively low bending strength can be a component with a bending strength lower than both the bending portion 112 and the receiving portion 111, or a component with a bending strength lower than only the receiving portion 111. Because the hardness of a material has a certain correlation with the bending strength of the component made of that material, in some embodiments, the connector can be made of a material with a hardness at least lower than the hardness of the material constituting the receiving portion 111.

[0166] By providing a bending groove 113 at the connection between the bending portion 112 and the receiving portion 111, the bending portion 112 is easily bent outward when subjected to riveting pressure. Moreover, the bending groove can also accommodate the deformation of the bending portion 112 during riveting, thereby improving the riveting strength and riveting efficiency of the bending portion 112 and the riveting yield rate. In addition, by providing a connector made of a material with lower bending strength at the connection between the bending portion 112 and the receiving portion 111, it can be effectively ensured that the bending portion 112 is more easily bent and deformed than the receiving portion 111 when subjected to riveting pressure.

[0167] 8 to 15 , according to some embodiments of the present application, optionally, the pole assembly 100 further includes a first insulating member 120 surrounding the outside of the pole body 110 , the first insulating member 120 including a first portion 121 and a second portion 122 , the first portion 121 being inserted into the mounting hole 211 of the first wall 210 , the second portion 122 being connected to the first portion 121 , and the second portion 122 being clamped between the bent portion 112 and the first wall 210 .

[0168] The first insulating member 120 is a component used to insulate the pole body 110 from the first wall 210. The material of the first insulating member 120 can be a plastic material such as polyethylene, polypropylene, polyvinyl chloride, or any one of silicone rubber, nitrile rubber, hydrogenated nitrile rubber, fluororubber, fluorosilicone rubber, EPDM rubber, chloroprene rubber, butyl rubber, acrylic rubber, natural rubber, and polyurethane rubber.

[0169] The first insulating member 120 includes a first portion 121 and a second portion 122 connected to the first portion 121. The first portion 121 is inserted between the receiving portion 111 and the first wall 210. The second portion 122 receives the bent portion 112 after bending and is sandwiched between the bent portion 112 and the first wall 210. Optionally, under the action of riveting pressure, the bent portion 112 abuts against the abutment surface S2 of the second portion 122, thereby connecting to a side of the first wall 210 via the second portion 122.

[0170] By wrapping the first insulating member 120 around the outside of the electrode body 110, inserting the first portion 121 of the first insulating member 120 into the mounting hole 211 of the first wall 210, and sandwiching the second portion 122 between the bent portion 112 and the first wall 210, the first insulating member 120 can reliably insulate the electrode body 110 from the first wall 210 of the battery housing 220, thereby improving the safety and reliability of the battery cell 200. Furthermore, because the second portion 122 of the first insulating member 120 can also provide support when the bent portion 112 is compressed, the bent portion 112 can be reliably positioned on the first wall 210 of the battery housing 220.

[0171] According to some embodiments of the present application, optionally, the inner circumference of the second portion 122 is larger than the inner circumference of the first portion 121 .

[0172] When the inner circumference of the second portion 122 is larger than the inner circumference of the first portion 121 , a certain space is left between the second portion 122 and the pole body 110 when the first insulating member 120 is wrapped around the pole body 110 .

[0173] By making the inner circumference of the second portion 122 larger than the inner circumference of the first portion 121, when the first insulating member 120 surrounds the outside of the pole body 110, the second portion 122 is separated from the pole body 110. Therefore, when riveting, the deformation of the receiving portion 111 and the bent portion 112 during riveting can be accommodated, which helps to reduce the possibility of excessive stress concentration and cracking the first insulating member 120, and can effectively improve the riveting efficiency of the pole assembly 100.

[0174] As shown in Figures 8 and 9, according to some embodiments of the present application, optionally, the bending portion 112 is connected to the receiving portion 111 at the connecting surface S1, and the bending portion 112 abuts against the abutting surface S2 of the second part 122. In the direction C of the central axis, the distance H between the connecting surface S1 and the abutting surface S2 is in the range of -5mm to +5mm.

[0175] When the first insulating member 120 is wrapped around the pole body 110, when the connection surface between the bent portion 112 and the receiving portion 111 is set to S1, and the abutting surface of the second portion 122 abutting the bent portion 112 is set to S2, the distance H between the connection surface S1 and the abutting surface S2 in the center axis direction C will affect the quality of riveting.

[0176] For example, when the direction on the side of the bending portion 112 in the direction C of the central axis of the receiving portion 111 is set to the positive direction "+" and the direction on the opposite side of the bending portion 112 is set to the negative direction "-", if the connecting surface S1 is closer to the positive direction than the abutting surface S2 by more than 5 mm, that is, the distance H between the connecting surface S1 and the abutting surface S2 is more than +5 mm, then since the bending portion 112 is bent roughly with the connecting surface S1 as the starting point, the distance between the bending portion 112 and the second part 122 of the first insulating member 120 is too large, which may make it impossible to firmly set the bending portion 112 on the first wall 210, that is, there may be a problem of not being able to press it tightly.

[0177] On the other hand, if the connection surface S1 is more than 5 mm closer to the negative direction than the abutment surface S2, that is, the distance H between the connection surface S1 and the abutment surface S2 is more than -5 mm, the bending portion 112 will excessively squeeze the second portion 122 surrounding the periphery and bend, which may crush the first insulating member 120 and cause insulation failure, that is, an over-extrusion problem will occur.

[0178] In Figures 8 and 9, to more clearly illustrate the connection surface S1 between the bent portion 112 and the receiving portion 111, the abutment surface S2 of the second portion 122, and the distance H therebetween, the framed portion is partially enlarged, and the lines representing the connection surface S1 and the abutment surface S2 are thickened. Optionally, as shown in Figure 9, before the bent portion 112 is bent, the distance H between the connection surface S1 of the bent portion 112 and the receiving portion 111 and the abutment surface S2 of the second portion 122 may also be within a range of -5 mm to +5 mm.

[0179] By making the distance H between the connecting surface S1 of the bending portion 112 and the receiving portion 111 and the abutting surface S2 of the second portion 122 within the range of -5mm to +5mm, the problem of insufficient pressing or excessive squeezing caused by not setting the distance H between the connecting surface S1 and the abutting surface S2 to an appropriate size can be reduced, thereby improving the yield rate when setting the pole assembly 100 and improving the safety and reliability of the battery cell 200.

[0180] According to some embodiments of the present application, optionally, the bending portion 112 is connected to the receiving portion 111 at the connecting surface S1, and the bending portion 112 abuts against the abutting surface S2 of the second part 122. In the direction C of the central axis, the distance H between the connecting surface S1 and the abutting surface S2 is in the range of -2 mm to +2 mm.

[0181] By making the distance H between the connecting surface S1 of the bending portion 112 and the receiving portion 111 and the abutting surface S2 of the second portion 122 within the range of -2mm to +2mm, the problem of insufficient pressing or excessive extrusion caused by not setting the distance H between the above-mentioned connecting surface S1 and the abutting surface S2 to an appropriate size can be further effectively reduced. The bending portion 112 can be appropriately bent and set on the first wall 210 of the battery housing 220, which can further improve the yield rate when setting the pole assembly 100.

[0182] As shown in FIG. 8 and FIG. 9 , according to some embodiments of the present application, optionally, the second portion 122 is formed with a protrusion 123 , and the protrusion 123 surrounds the bent portion 112 .

[0183] The raised portion 123 of the second part 122 can surround the bent portion 112 , so that the bent portion 112 can be accommodated in the receiving groove 124 , which is a space defined by the raised portion 123 .

[0184] By utilizing the raised portion 123 formed on the second portion 122 to surround the bent portion 112, the receiving groove defined by the raised portion 123 can be utilized to accommodate the bent portion 112. This can reduce the probability of the bent portion 112 contacting the first wall 210 of the battery housing 220. The first insulating member 120 can be utilized to reliably insulate the receiving portion 111 and the bent portion 112 from the first wall 210 of the battery housing 220, thereby ensuring safety in use.

[0185] According to some embodiments of the present application, optionally, a retaining portion 114 is provided at the other end of the pole body 110 in the direction C of the central axis of the receiving portion 111 , and the retaining portion 114 and the bending portion 112 are clamped on both sides of the first wall 210 .

[0186] In some embodiments, the retaining portion 114 of the pole body 110 is disposed at an end of the receiving portion 111 opposite the bent portion 112. Optionally, the retaining portion 114 may extend in a direction substantially perpendicular to the central axis direction C and be clamped together with the bent portion 112 on both sides of the first wall 210, thereby integrally securing the pole body 110 to the first wall 210.

[0187] By providing such a retaining portion 114, the retaining portion 114 and the bending portion 112 can be used to stably position the pole body 110 on the first wall 210 of the battery housing 220 without detachment. This also helps to reduce the possibility of poor contact between the pole body 110 and the electrode assembly 230 of the battery cell 200, resulting in unusable conditions.

[0188] According to some embodiments of the present application, optionally, the pole assembly 100 further includes a seal 130 , which is disposed between the retaining portion 114 and the first wall 210 to seal the receiving portion 111 and the first wall 210 .

[0189] The seal 130 is disposed between the retaining portion 114 and the first wall 210 and is used to seal the gap between the receiving portion 111 and the first wall 210. The seal 130 may be made of a plastic material such as polyethylene, polypropylene, or polyvinyl chloride, or may be made of any of silicone rubber, nitrile rubber, hydrogenated nitrile rubber, fluororubber, fluorosilicone rubber, EPDM rubber, chloroprene rubber, butyl rubber, acrylic rubber, natural rubber, and polyurethane rubber.

[0190] By providing a seal 130 between the retaining portion 114 and the first wall 210 of the battery shell 220 to seal the receiving portion 111 and the first wall 210 of the battery shell 220, the gap between the receiving portion 111 and the first wall 210 of the battery shell 220 can be sealed, thereby reducing the possibility of electrolyte leakage from the battery cell 200 through the gap between the receiving portion 111 and the first wall 210 of the battery shell 220, and further improving the safety and reliability of the battery cell 200.

[0191] According to some embodiments of the present application, optionally, the retaining portion 114 is located within the battery housing 220 of the battery cell 200 .

[0192] Optionally, when the holding portion 114 and the bending portion 112 are clamped on both sides of the first wall 210 , the holding portion 114 is located on the inner side of the battery housing 220 , and the bending portion 112 is correspondingly located on the outer side of the battery housing 220 .

[0193] Because the retaining portion 114 is located within the battery housing 220 of the battery cell 200, the bent portion 112 disposed on the outer side of the first wall 210 can be conveniently riveted from outside the battery cell 200. Compared to a structure in which the retaining portion 114 is disposed outside the battery housing 220 and the bent portion 112 is disposed inside the battery housing 220, the riveting operation space can be increased.

[0194] According to some embodiments of the present application, optionally, the pole assembly 100 further includes a second insulating member 150 , which is disposed between the retaining portion 114 and the first wall 210 .

[0195] The second insulating member 150 disposed between the retaining portion 114 and the first wall 210 can insulate the retaining portion 114 from the first wall 210. Alternatively, the second insulating member 150 can include a portion extending in a direction substantially perpendicular to the central axis direction C, thereby stably sandwiching the second insulating member 150 between the retaining portion 114 and the first wall 210.

[0196] By providing the second insulating member 150 , the holding portion 114 and the first wall 210 of the battery case 220 can be reliably insulated.

[0197] According to some embodiments of the present application, optionally, the battery cell 200 further includes a transition piece 140 , the pole body 110 is fixed to the transition piece 140 , and the transition piece 140 electrically connects the pole body 110 with the electrode assembly 230 of the battery cell 200 .

[0198] The adapter 140 is a component electrically connected to the electrode assembly 230 of the battery cell 200 and is made of a conductive material such as metal or alloy. In some embodiments, the adapter 140 can also function as a component for fixing the electrode body 110 .

[0199] By fixing the pole body 110 to the adapter 140 and using the adapter 140 to electrically connect the pole body 110 to the electrode assembly 230 of the battery cell 200, the pole body 110 can be electrically connected to the electrode assembly 230 while using the adapter 140 to provide support for the pole body 110, so that the pole body 110 can be stably set on the battery cell 200.

[0200] According to some embodiments of the present application, optionally, the battery housing 220 includes a shell and an end cover, and the first wall 210 is the shell and / or the end cover.

[0201] The battery housing 220 includes, for example, a shell and an end cap. The shell houses the electrode assembly 230, while the end cap seals the opening of the shell. The electrode assembly 100 can be mounted on either sidewall of the battery housing 220, on the end cap, or, if desired, on both the shell and the end cap.

[0202] By adopting such a structure, since the first wall 210 on which the pole body 110 is provided can be the shell and / or end cover of the battery housing 220, the design freedom can be improved and the position of the pole body 110 can be appropriately selected according to needs.

[0203] An embodiment of the present application further provides a battery, wherein the battery includes the battery cell 200 in the above embodiment.

[0204] By having the features of the embodiments of the present application, the provided battery can obtain the benefits described with respect to the battery cell 200 .

[0205] An embodiment of the present application further provides an electric device, comprising the battery in the above embodiment, wherein the battery is configured to supply power to the electric device.

[0206] By having the features of the embodiments of the present application, the provided electric device can obtain the benefits described with respect to the battery cell 200 and the battery.

[0207] The structures of some embodiments of the present application are illustrated below with reference to FIG. 2 to FIG. 17 .

[0208] As shown in FIG. 2 and FIG. 3 , a battery cell 200 included in the battery B includes a positive terminal cap serving as a first wall 210 , a battery case 220 , an electrode assembly 230 , and a negative terminal cap 240 .

[0209] The battery housing 220 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the battery housing can be determined according to the specific shape and size of the electrode assembly. The material of the battery housing 220 can be copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. Here, the case where the battery housing 220 is cylindrical is illustrated, but it is not limited to this. The electrode assembly 230 is the component in the battery cell 200 where the electrochemical reaction occurs and is arranged inside the battery housing 220.

[0210] The battery case 220 is formed by sealing the opening with the positive terminal cap and the negative terminal cap 240 as the first wall 210, thereby forming a storage space for accommodating the electrode assembly 230, the electrolyte, and other components. Here, the case where the first wall 210 is the positive terminal cap is illustrated, but the first wall 210 can also be used as the negative terminal cap or as both the positive terminal cap and the negative terminal cap, and is not particularly limited. In addition, when the first wall 210 is used as only one of the positive terminal cap and the negative terminal cap, the other of the positive terminal cap and the negative terminal cap can be a component independent of the battery case 220 or can be integrated with the battery case 220.

[0211] In addition, as shown in Figure 3, optionally, the battery cell 200 may also include a sealing nail 260 made of a material such as plastic and a fixing member 250 that prevents the sealing nail 260 from detaching from the pole body 110. The sealing nail 260 is used to seal the injection hole after the liquid is injected through the injection hole formed in the pole body 110, thereby preventing the electrolyte from leaking to the outside through the injection hole. Optionally, the fixing member 250 can be made of a conductive material (such as aluminum). For example, after the sealing nail 260 is inserted into the injection hole, the fixing member 250 is welded to the pole body 110, thereby preventing the sealing nail 260 from detaching from the pole body 110.

[0212] As shown in Figures 4 to 17, the pole assembly 100 includes a pole body 110. In addition, optionally, the pole assembly 100 may also include a first insulating member 120 for insulating the pole body 110 from the first wall 210, a sealing member 130 for preventing the outflow of electrolyte, and a second insulating member 150 for insulating the pole body 110 from the first wall 210. The pole body 110 includes a receiving portion 111 and a bending portion 112. The bending portion 112 is formed into a cylindrical shape by, for example, a bending wall, and is formed with a rivet hole for pressing a rivet into. The bending portion 112 is bent by pressing the rivet into the rivet hole and riveting. The receiving portion 111 is formed into a cylindrical shape by, for example, a receiving wall, and is connected to the bending portion 112 at one end in the direction C of the central axis.

[0213] In addition, as shown in Figures 8 to 15 , in some embodiments, the pole body 110 may optionally further include a retaining portion 114 , which is disposed at an end of the receiving portion 111 opposite to the bent portion 112 and extends in a direction substantially perpendicular to the central axis direction C. The retaining portion 114 and the bent portion 112 may be clamped on both sides of the first wall 210 .

[0214] Hereinafter, an example of the steps for mounting the terminal assembly 100 on the battery cell 200 will be described. It should be noted that the order of the following mounting steps is not particularly limited and can be adjusted according to actual conditions.

[0215] As shown in Figures 3 and 4, the retaining portion 114 of the pole body 110 can be fixed to the adapter 140, for example, by welding. In addition, optionally, for example, when the pole body 110 does not have the retaining portion 114, the receiving portion 111 can also be directly fixed to the adapter 140. The sealing member 130 and the second insulating member 150 are respectively mounted on the pole body 110, and the pole body 110 with the sealing member 130 and the second insulating member 150 is inserted from the side of the first wall 210 facing the interior of the battery cell 200 (i.e., the inner side) into the mounting hole 211 of the first wall 210, so that the receiving portion 111 in the pole body 110 is passed through the mounting hole 211, and the second insulating member 150 is abutted against the inner side of the first wall 210. In this state, the bent portion 112 extends to the outside of the first wall 210. The first insulating member 120 is sleeved onto the pole body 110 from the outside of the first wall 210, for example, to the state shown in Figures 9, 10, 12, and 14. Optionally, the pole body 110 in this state is riveted, for example, by inserting a rivet into the riveting hole of the bent portion 112 to bend the bent portion 112. As the riveting process continues, the bent portion 112 bends and connects to the first wall 210 through the first insulating member 120, to the state shown in Figures 8, 11, 13, and 15. In this way, the pole assembly 100 is installed on the first wall 210. For example, after the pole assembly 100 is installed on the first wall 210, the adapter 140 is electrically connected to the electrode assembly 230, and the electrode assembly 230 and the first wall 210 are placed together in the battery housing 220 of the battery cell 200. After fixing and sealing as required, the pole assembly 100 is installed on the battery cell 200.

[0216] As shown in Figures 8 to 15, in some embodiments, a flange portion 111a is optionally provided in the direction C of the central axis of the receiving portion 111 at a position a certain distance from the end of the receiving portion 111 away from the bent portion 112. An injection hole for injecting electrolyte is formed in the flange portion 111a. After the electrode assembly 100 is installed on the battery cell 200 and the electrolyte is injected through the injection hole, the sealing nail 260 is inserted into the injection hole to seal it, and the fixing member 250 is fixed to the electrode body 110 by, for example, welding, to prevent the sealing nail 260 from detaching from the injection hole. In the above structure, since the flange portion 111a is provided at a certain distance from the end of the receiving portion 111 away from the bent portion 112, it is equivalent to lifting the bottom wall of the receiving portion 111. This can increase the bending strength of the receiving portion 111, making it less likely for the receiving portion 111 to bend and deform during riveting.

[0217] In addition, in some embodiments, as shown in Figures 8 to 15, the minimum thickness t1 of the receiving portion 111 is greater than the maximum thickness t2 of the bending portion 112. For example, the minimum thickness t1 of the receiving wall constituting the receiving portion 111 is greater than the maximum thickness t2 of the bending wall constituting the bending portion 112. In order to make the minimum thickness t1 of the receiving portion 111 greater than the maximum thickness t2 of the bending portion 112, a thinning groove 112a can be provided on at least one side of the bending portion 112 in a direction substantially perpendicular to the central axis direction C. For example, when observing in a direction substantially perpendicular to the central axis direction C, that is, in a cross-sectional direction, as shown in Figure 9, the outer circumferential dimension of the receiving portion 111 can be made the same as the outer circumferential dimension of the bending portion 112 before bending, and the inner circumferential dimension of the receiving portion 111 can be made smaller than the inner circumferential dimension of the bending portion 112 before bending, that is, the inner wall portion of the bending wall of the bending portion 112 can be thinned; or the inner circumferential dimension of the receiving portion 111 can be made the same as the inner circumferential dimension of the bending portion 112 before bending, as shown in Figures 10 and 11. The inner circumference of the receiving portion 111 is the same as that of the bent portion 112, and the outer circumference of the receiving portion 111 is larger than that of the bent portion 112 before bending, that is, the outer wall portion of the bent wall of the bent portion 112 is thinned; as shown in FIG12 , the outer circumference of the receiving portion 111 is larger than that of the bent portion 112 before bending, and the inner circumference of the receiving portion 111 is smaller than that of the bent portion 112 before bending, that is, the inner and outer wall portions of the bent wall of the bent portion 112 are thinned. In addition, in some embodiments, in order to make the minimum thickness t1 of the receiving portion 111 greater than the maximum thickness t2 of the bent portion 112, the thickness of the receiving wall constituting the receiving portion 111 can also be appropriately thickened.

[0218] As shown in Figures 8 to 15, when the minimum thickness t1 of the receiving portion 111 is greater than the maximum thickness t2 of the bent portion 112, the ratio of the maximum thickness t2 of the bent portion 112 to the minimum thickness t1 of the receiving portion 111 can be greater than 0 and within a range of 0.85, for example, 0.45. Furthermore, the ratio of the thickness t2 of the bent portion 112 to the thickness t1 of the receiving portion 111 can be in a range of 0.3 to 0.7, for example, 0.4.

[0219] In addition, in some embodiments, as shown in Figures 16 and 17 , reinforcing ribs 111b are provided on the inner side of the receiving portion 111. For example, a plurality of reinforcing ribs 111b are provided at intervals along the circumference of the receiving portion 111 and extend in the direction of the central axis C to the connection between the receiving portion 111 and the bent portion 112. The provision of the reinforcing ribs 111b effectively increases the bending strength of the receiving portion 111.

[0220] In addition, in some embodiments, as shown in Figures 14 and 15 , a bending groove 113 is provided at the connection between the bent portion 112 and the receiving portion 111. The bending groove 113 facilitates bending of the bent portion 112 outward during the riveting process and also accommodates deformation of the bent portion 112 during riveting. Even with the bending groove 113, it is not necessary to reduce the thickness of the bent portion 112 or increase the thickness of the receiving portion 111. Alternatively, the thickness of the receiving portion 111 can be made substantially the same as the thickness of the bent portion 112.

[0221] In addition, in some embodiments, as shown in FIG8 and FIG9 , in the direction C of the central axis of the receiving portion 111, the distance H between the bent portion 112 and the connecting surface S1 of the receiving portion 111 and the abutting surface S2 of the second portion 122 can be in the range of -5 mm to +5 mm, and optionally, can also be in the range of -2 mm to +2 mm. In addition, in some embodiments, as shown in FIG8 and FIG9 , when the bent portion 112 is bent to connect with the first wall 210, the distance H between the bent portion 112 and the connecting surface S1 of the receiving portion 111 and the abutting surface S2 of the second portion 122 is in the range of -5 mm to +5 mm, and optionally, can also be in the range of -2 mm to +2 mm.

[0222] In this way, the problem of insufficient pressing or excessive squeezing caused by not setting the distance H between the above-mentioned connecting surface S1 and the abutting surface S2 to an appropriate range can be reduced, the yield rate when setting the pole assembly can be improved, and the safety and reliability of the battery cell can be improved.

[0223] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell (200) having a battery housing (220), wherein a pole assembly (100) is arranged on a first wall (210) of the battery housing (220), wherein the pole assembly (100) comprises a pole body (110), wherein: The pole body (110) comprises: a receiving portion (111), the receiving portion (111) being passed through a mounting hole (211) of the first wall (210); and A bending portion (112), the bending portion (112) is connected to an end portion in the central axis direction (C) of the receiving portion (111) and is bent relative to the receiving portion (111) and is arranged on one side of the first wall (210), and the bending strength of the bending portion (112) is less than the bending strength of the receiving portion (111).

2. The battery cell (200) according to claim 1, wherein: The minimum thickness (t1) of the receiving portion (111) is greater than the maximum thickness (t2) of the bending portion (112).

3. The battery cell (200) according to claim 1 or 2, wherein: The ratio of the maximum thickness (t2) of the bending portion (112) to the minimum thickness (t1) of the receiving portion (111) is within a range greater than 0 and within 0.

85.

4. The battery cell (200) according to any one of claims 1 to 3, wherein: The ratio of the maximum thickness (t2) of the bending portion (112) to the minimum thickness (t1) of the receiving portion (111) is in the range of 0.3 to 0.

7.

5. The battery cell (200) according to any one of claims 1 to 4, wherein: A thinning groove (112a) is provided on at least one side of the bending portion (112) in a direction substantially perpendicular to the central axis direction (C).

6. The battery cell (200) according to any one of claims 1 to 5, wherein: The receiving portion (111) is provided with an anti-bending reinforcement portion.

7. The battery cell (200) according to claim 6, wherein: The anti-bending reinforcement portion includes a flange portion (111a) extending from the inner surface of the receiving portion (111) toward the center of the receiving portion (111).

8. The battery cell (200) according to claim 7, wherein: The flange portion (111a) is arranged on the inner surface of the receiving portion (111) in a manner that surrounds the entire circumference.

9. The battery cell (200) according to claim 7 or 8, wherein: In the direction (C) of the central axis, the flange portion (111a) and the end of the receiving portion (111) away from the bending portion (112) have a certain distance.

10. The battery cell (200) according to any one of claims 7 to 9, wherein: At least a portion of the flange portion (111a) is located in the mounting hole (211).

11. The battery cell (200) according to any one of claims 7 to 10, wherein: The pole body (110) further comprises a retaining portion (114) connected to the receiving portion (111); the retaining portion (114) and the bending portion (112) are respectively arranged on both sides of the first wall (210); and the flange portion (111a) and the retaining portion (114) are spaced apart.

12. The battery cell (200) according to any one of claims 6 to 11, wherein: The anti-bending reinforcement portion includes a reinforcement rib (111b) arranged on the inner side of the receiving portion (111), wherein the reinforcement rib (111b) extends in the direction (C) of the central axis and is arranged in plurality at intervals along the circumference of the receiving portion (111).

13. The battery cell (200) according to claim 12, wherein: The reinforcing rib (111b) extends to the connection portion between the receiving portion (111) and the bending portion (112).

14. The battery cell (200) according to any one of claims 1 to 13, wherein: A weakened bending portion is provided at a connection portion between the bending portion (112) and the receiving portion (111), and the bending portion (112) is bent from the weakened bending portion.

15. The battery cell (200) according to claim 14, wherein: The bending weakened portion is a bending groove (113) or a connecting piece made of a material with low bending strength.

16. The battery cell (200) according to any one of claims 1 to 15, wherein: The pole assembly (100) further comprises a first insulating member (120) surrounding the outside of the pole body (110), wherein the first insulating member (120) comprises a first portion (121) and a second portion (122). The first part (121) is inserted into the mounting hole (211) of the first wall (210), the second part (122) is connected to the first part (121), and the second part (122) is clamped between the bent portion (112) and the first wall (210).

17. The battery cell (200) according to claim 16, wherein: The inner circumference of the second portion (122) is greater than the inner circumference of the first portion (121).

18. The battery cell (200) according to claim 16 or 17, wherein: The bending portion (112) is connected to the receiving portion (111) at a connecting surface (S1), and the bending portion (112) is in contact with a contact surface (S2) of the second portion (122). In the direction of the central axis (C), a distance (H) between the connecting surface (S1) and the contact surface (S2) is in the range of -5 mm to +5 mm.

19. The battery cell (200) according to any one of claims 16 to 18, wherein: The bending portion (112) is connected to the receiving portion (111) at a connecting surface (S1), the bending portion (112) is in contact with a contact surface (S2) of the second portion (122), and in the direction of the central axis (C), the connecting The distance (H) between the surface (S1) and the contact surface (S2) is in the range of -2 mm to +2 mm.

20. The battery cell (200) according to any one of claims 16 to 19, wherein: The second portion (122) is formed with a protruding portion (123), and the protruding portion (123) surrounds the bent portion (112).

21. The battery cell (200) according to any one of claims 1 to 20, wherein: A retaining portion (114) is provided at the other end of the pole body (110) in the direction (C) of the central axis of the receiving portion (111), and the retaining portion (114) and the bending portion (112) are clamped on both sides of the first wall (210).

22. The battery cell (200) according to claim 21, wherein: The pole assembly (100) further comprises a sealing member (130), wherein the sealing member (130) is arranged between the retaining portion (114) and the first wall (210) to seal the receiving portion (111) and the first wall (210).

23. The battery cell (200) according to any one of claims 21 to 22, wherein: The retaining portion (114) is located in a battery housing (220) of the battery cell (200).

24. The battery cell (200) according to any one of claims 21 to 23, wherein: The pole assembly (100) further includes a second insulating member (150), wherein the second insulating member (150) is disposed between the retaining portion (114) and the first wall (210).

25. The battery cell (200) according to any one of claims 1 to 24, wherein: The battery cell (200) further comprises a transition piece (140), the pole body (110) is fixed to the transition piece (140), and the transition piece (140) electrically connects the pole body (110) to the electrode assembly (230) of the battery cell (200).

26. The battery cell (200) according to any one of claims 1 to 25, wherein: The battery housing (220) comprises a shell and an end cover, and the first wall (210) is the shell and / or the end cover.

27. A battery, wherein: A battery cell (200) comprising any one of claims 1 to 26.

28. An electrical device, wherein: The battery according to claim 27 is configured to supply power to the powered device.

Images