Battery monomer, battery device and power utilization device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The shell is provided with at least one first boss protruding in the direction, away from the electrode assembly, of the shell and counter bores corresponding to the first bosses, the counter bores are located in the side, facing the electrode assembly, of the shell, and the arrangement direction of the first bosses and the electrode assembly is the first direction. The first sub-hole is located on the side, facing the electrode assembly, of the second sub-hole in the first direction, the second sub-hole is partially formed in the first boss and is projected in the first direction, at least part of the projection area of the second sub-hole is located in the projection area of the first sub-hole, and the conductive assembly is at least partially electrically connected with the electrode assembly. Each conductive assembly is in limiting contact with at least one first boss. The resistance of stamping deformation of the shell is reduced through the first sub-hole, so that the first boss can be stamped to a higher height, and the first boss can better limit the conductive assembly.

Description

Technical Field

[0001] The present application relates to the technical field, and particularly to a battery cell, a battery device and an electrical device. Background Art

[0002] Batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power wholly or partly. In related technologies, the conductive components of the battery cell may rotate. Summary of the Utility Model

[0004] In view of this, embodiments of the present application are expected to provide a battery cell, a battery device and an electrical device to limit the rotation of the conductive components.

[0005] A first aspect of embodiments of the present application provides a battery cell, including:

[0006] An electrode assembly;

[0007] A housing having at least one first boss protruding in a direction away from the electrode assembly of the housing and a counterbore corresponding to each first boss, the electrode assembly being located inside the housing, the counterbore being located on a side of the housing facing the electrode assembly, the arrangement direction of the first boss and the electrode assembly being a first direction, the counterbore having a first sub-hole and a second sub-hole communicating with each other, the first sub-hole being located on a side of the second sub-hole facing the electrode assembly along the first direction, the second sub-hole being partially formed in the first boss, and in a projection along the first direction, the projection area of the second sub-hole is at least partially located within the projection area of the first sub-hole;

[0008] A conductive component, at least partially electrically connected to the electrode assembly, the number of the conductive components being at least one, and each conductive component being in limit contact with at least one of the first bosses respectively.

[0009] In embodiments of the present application, at least part of the material around the first boss is pushed to a side away from the electrode assembly through the first sub-hole, reducing the resistance of the housing stamping deformation, which is beneficial for the stamping die to partially extend into the second sub-hole to stamp out a relatively high height of the first boss, so that the first boss can better limit the conductive component.

[0010] In one embodiment, in a projection along the first direction, the projection area of the first boss is located within the projection area of the first sub-hole.

[0011] In the embodiment of the present application, the material around the first boss is squeezed along the protruding direction of the first boss through the first sub-hole, which helps to reduce the resistance of the stamping die in punching out the first boss in the second sub-hole, so that the first boss can be punched out to a higher height.

[0012] In one embodiment, the hole wall surface of the second sub-hole includes a first surface and a second surface connected to each other, the second surface surrounds the first surface, and the angle between the first surface and the second surface ranges from 95° to 120°.

[0013] In the embodiment of the present application, the stretching degree of the hole wall of the second sub-hole during the stamping process is reduced, and the resistance of the stamping die to punching out the first boss in the second sub-hole is reduced, which is conducive to reducing the difficulty of stamping.

[0014] In one embodiment, the housing comprises:

[0015] case;

[0016] The end cover is connected to the shell, and the electrode assembly is located in the space enclosed by the shell and the end cover. The first boss is formed on the end cover, and the first boss protrudes in the direction of the end cover away from the electrode assembly. The countersunk hole is located on the side of the end cover facing the electrode assembly.

[0017] In the embodiment of the present application, the first boss is formed on the end cover, and the resistance to stamping deformation of the end cover is reduced by setting the first sub-hole and the second sub-hole, so that the first boss can be stamped out to a higher height on the end cover to limit the rotation of the conductive component.

[0018] In one embodiment, a ratio of the depth of the first sub-hole to the thickness of the end cover is a first ratio, and the first ratio ranges from 0.2 to 0.5.

[0019] In the embodiment of the present application, it is possible to ensure that the first boss is punched out to a suitable height while ensuring that the structural strength of the end cover at the first boss basically meets the requirements.

[0020] In one embodiment, the minimum distance between the hole wall surface of the second sub-hole and the outer surface of the first boss is a preset distance, and the ratio of the preset distance to the thickness of the end cover is a second ratio, and the range of the second ratio is 0.35 to 0.8.

[0021] In the embodiment of the present application, the strength of the first boss at the corner is basically satisfied, and the first boss can be punched out to a more appropriate height.

[0022] In one embodiment, a recessed portion is formed on a side of the end cover facing away from the electrode assembly, and the recessed portion and the first boss are configured to form a recessed groove surrounding the first boss, and an opening direction of the recessed groove faces away from the electrode assembly.

[0023] In the embodiment of the present application, the side of the first boss along the first direction is made as close to being parallel to the first direction as possible, so as to reduce the possibility of the conductive component and the first boss slipping off, and enable the first boss to better limit the conductive component.

[0024] In one embodiment, the ratio of the depth of the sink to the thickness of the end cover is a third ratio, and the range of the third ratio is 0.02 to 0.1.

[0025] In the embodiment of the present application, under the premise that the structural strength of the end cover basically meets the requirements, the side of the first boss along the first direction can be as close to being parallel to the first direction as possible.

[0026] In one embodiment, the sink is in the shape of a ring.

[0027] In the embodiment of the present application, the annular groove is easy to process and manufacture on the outer shell, and the groove wall transition of the groove is relatively smooth, which is beneficial to reduce stress concentration.

[0028] In one embodiment, a dimension of the first boss protruding from the end cover along the thickness direction of the end cover is a first dimension, a ratio of the first dimension to the thickness of the end cover is a fourth ratio, and a range of the fourth ratio is 0.8 to 1.5.

[0029] In the embodiment of the present application, the possibility of the first boss being separated from the conductive component is reduced, which is beneficial to limiting the rotation of the conductive component, and the height of the first dimension is appropriate, which facilitates the processing of the first boss.

[0030] In one embodiment, the end cover is made of steel.

[0031] In the embodiment of the present application, the degree to which the strength of the end cover is reduced by making the first boss on the end cover is reduced, thereby improving the structural strength of the end cover.

[0032] In one embodiment, the conductive component includes:

[0033] An insulating member, located at a side of the housing away from the electrode assembly, the insulating member having an avoidance hole and at least one second boss, each of the second bosses being sleeved on the corresponding first boss;

[0034] A conductive terminal passes through the avoidance hole, the conductive terminal is electrically connected to the electrode assembly, each conductive terminal is respectively sleeved on the corresponding second boss, and the insulating member is at least partially located between the conductive terminal and the shell.

[0035] In the embodiment of the present application, the connection firmness between the conductive terminal and the insulating member can be enhanced. The insulating member is conducive to limiting the movement of the conductive terminal relative to the first boss, and the insulating member can also insulate the conductive terminal.

[0036] In one embodiment, the conductive terminal comprises:

[0037] A first conductive member, passing through the avoidance hole, wherein the first conductive member is electrically connected to the electrode assembly;

[0038] The second conductive member is connected to the first conductive member, and is located on a side of the shell away from the electrode assembly. The second conductive member is sleeved on the corresponding second boss, and the insulating member is at least partially located between the second conductive member and the shell.

[0039] In the embodiment of the present application, the restriction on the movement of the conductive terminal is strengthened through the cooperation of the second conductive member, the first conductive member and the insulating member.

[0040] In one embodiment, the number of the first bosses is at least two, and each of the conductive components is in limiting contact with at least two of the first bosses respectively.

[0041] In the embodiment of the present application, the conductive component is limited at at least two different positions, which is helpful to limit the rotation of the conductive component.

[0042] A second aspect of an embodiment of the present application provides a battery device, including:

[0043] Box;

[0044] According to any one of the above battery cells, the battery cell is installed in the box.

[0045] In the embodiment of the present application, at least part of the material around the first boss is pushed toward the side away from the electrode assembly through the first sub-hole, thereby reducing the resistance to the stamping deformation of the shell, and facilitating the stamping die to partially extend into the second sub-hole to stamp the first boss to a higher height, so that the first boss can better limit the conductive component.

[0046] A third aspect of the embodiments of the present application provides an electrical device, including:

[0047] Device body;

[0048] According to the above-mentioned battery device, the battery device is mounted on the device body.

[0049] In the embodiment of the present application, at least part of the material around the first boss is pushed toward the side away from the electrode assembly through the first sub-hole, thereby reducing the resistance to the stamping deformation of the shell, and facilitating the stamping die to partially extend into the second sub-hole to stamp the first boss to a higher height, so that the first boss can better limit the conductive component.

[0050] Utility Model Effect

[0051] A battery cell, a battery device and an electrical device provided by an embodiment of the present application push at least part of the material around the first boss to the side away from the electrode assembly through the first sub-hole. During the process of the stamping die extruding part of the material of the shell wall of the outer shell along the protruding direction of the first boss, the tensile deformation of the material at the second sub-hole is reduced, and the resistance of the outer shell stamping deformation is reduced, which is beneficial to the stamping die partially extending into the second sub-hole to stamp the first boss to a higher height, so that the first boss can better limit the conductive assembly. Description of the Drawings

[0052] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0053] Figure 1 is an exploded view of the battery cell according to the embodiment of the present application;

[0054] Figure 2 is Figure 1 the enlarged view at A in

[0055] Figure 3 is a schematic structural view of the end cap of the battery cell according to the embodiment of the present application;

[0056] Figure 4 is Figure 3 the cross-sectional view taken along line B-B in

[0057] Figure 5 is Figure 4 the enlarged view at C in

[0058] Figure 6 is a schematic structural view of the conductive assembly of the battery cell according to the embodiment of the present application, and the end cap is shown in the figure;

[0059] Figure 7 is Figure 6 the cross-sectional view taken along line D-D in

[0060] Figure 8 is Figure 7 the enlarged view at E in

[0061] Description of the Reference Numerals

[0062] 1. Electrode assembly; 2. Housing; 21. First boss; 22. Concave portion; 23. Counterbore; 231. First sub-hole; 232. Second sub-hole; 233. First surface; 234. Second surface; 24. Sunk groove; 25. Housing body; 26. End cap; 3. Conductive assembly; 31. Insulating member; 311. Second boss; 312. Avoidance hole; 32. Conductive terminal; 321. First conductive member; 322. Second conductive member. Detailed implementation manners

[0063] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "at least two" means more than two unless otherwise specifically defined.

[0066] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0070] In the related art, the electrode assembly in the battery cell is located in the shell, the conductive assembly is connected to the electrode assembly, the conductive assembly is installed on the shell, and a first boss is provided on the shell, and the first boss abuts against the conductive assembly to limit the rotation of the conductive assembly. The resistance of the stamping deformation of the shell is relatively large, and the protrusion height of the first boss stamped on the shell is difficult to meet the anti-torsion requirements of the conductive assembly, and the first boss abutted by the conductive assembly may slip off.

[0071] The battery cell of the embodiment of the present application includes an electrode assembly 1, a shell 2 and a conductive assembly 3. The shell 2 has at least one first boss 21 and a countersunk hole 23 corresponding to each first boss 21. The countersunk hole 23 has a first sub-hole 231 and a second sub-hole 232 that are interconnected. When projected along a first direction, the projection area of ​​the second sub-hole 232 is at least partially located within the projection area of ​​the first sub-hole 231. Each conductive assembly 3 is respectively in limited contact with at least one first boss 21. The first sub-hole 231 allows the first boss 21 to have a higher protruding height to limit the rotation of the conductive assembly 3.

[0072] The battery cells of the embodiments of the present application can be applied to battery devices, and the battery devices can be applied to power-consuming devices.

[0073] An embodiment of the present application provides a battery device, which includes a box and a battery cell, wherein the battery cell is installed in the box.

[0074] The battery device may be a battery pack or an energy storage device.

[0075] The battery pack may include at least two battery cells. The at least two battery cells may be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the at least two battery cells. The at least two battery cells may be directly connected in series, in parallel, or in a combined series-parallel connection, and then the whole formed by the at least two battery cells is placed in a box. The battery device may further include other structures. For example, the battery device may further include a busbar component for realizing the electrical connection between the at least two battery cells.

[0076] An energy storage device is a device for storing electrical energy. For example, an energy storage cabinet or an energy storage container. The battery device in the embodiments of the present application is applicable to an electrical device.

[0077] The embodiments of the present application provide an electrical device, which includes a device main body and a battery device, and the battery device is installed on the device main body.

[0078] An electrical device is a device that uses electrical energy as an energy source to achieve corresponding functions by consuming electrical energy. Exemplarily, the electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0079] The device main body refers to the main body structure that consumes electrical energy to achieve corresponding functions. For example, if the electrical device is a mobile phone, the device main body is the part that can achieve functions such as communication, and is powered by the battery cell or the battery device to the part that can achieve functions such as communication. For example, if the electrical device is a car, the device main body is the part for people to ride and can travel on the road, and is powered by the battery cell or the battery device to the part for people to ride and can travel on the road.

[0080] Taking the electrical device in an embodiment of the present application as a vehicle and the battery device as a battery pack as an example for illustration.

[0081] The vehicle provided in an embodiment of the present application may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, the head, or the tail of the vehicle. The battery pack may be used for power supply of the vehicle. For example, the battery pack may be used as the operating power source of the vehicle. The vehicle may further include a controller and a motor, and the controller may be used to control the battery pack to supply power to the motor. For example, the battery pack may be used for the working power requirements during the start, navigation, and driving of the vehicle.

[0082] In some embodiments of the present application, the battery pack can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0083] Embodiments of the present application provide a battery cell. Please refer to Figures 1 to 8 , the battery cell includes an electrode assembly 1, a housing 2 and a conductive assembly 3. The housing 2 has at least one first boss 21 protruding in a direction away from the electrode assembly 1 and a counterbore 23 corresponding to each first boss 21. The electrode assembly 1 is located inside the housing 2, and the counterbore 23 is located on the side of the housing 2 facing the electrode assembly 1. The arrangement direction of the first boss 21 and the electrode assembly 1 is the first direction. The counterbore 23 has a first sub-hole 231 and a second sub-hole 232 that communicate with each other. The first sub-hole 231 is located on the side of the second sub-hole 232 facing the electrode assembly 1 along the first direction. The second sub-hole 232 is partially formed in the first boss 21. When projected along the first direction, the projection area of the second sub-hole 232 is at least partially located within the projection area of the first sub-hole 231. The conductive assembly 3 is at least partially electrically connected to the electrode assembly 1. The number of conductive assemblies 3 is at least one, and each conductive assembly 3 is in limiting contact with at least one first boss 21 respectively.

[0084] The housing 2 can be a sealed structure or a non-sealed structure. Exemplarily, when the housing 2 is a non-sealed structure, the housing 2 serves to protect the motor assembly, and a sealing bag is further included between the housing 2 and the electrode assembly 1. The sealing bag is used to encapsulate the electrode assembly 1 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating part 31 or an aluminum-plastic film.

[0085] The electrode assembly 1 can be a wound structure or a stacked structure.

[0086] The battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0087] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. Embodiments of the present application do not limit this.

[0088] For the convenience of description, as shown in the figure, the first direction is the direction indicated by the arrow of R1.

[0089] Exemplarily, the conductive assembly 3 is a terminal post.

[0090] Exemplarily, the first boss 21 and the counterbore 23 are formed by stamping.

[0091] In the embodiment of the present application, at least part of the material around the first boss 21 is pushed to the side away from the electrode assembly 1 through the first sub-hole 231. During the process of the stamping die extruding part of the material of the shell wall of the shell 2 along the protruding direction of the first boss 21, the tensile deformation of the material at the second sub-hole 232 is reduced, and the resistance of the shell 2 to stamping deformation is reduced, which is beneficial to the stamping die partially extending into the second sub-hole 232 to stamp out a higher height of the first boss 21, so that the first boss 21 can better limit the conductive component 3.

[0092] In one embodiment, please refer to Figure 5 , when projected along the first direction, the projection area of the first boss 21 is located within the projection area of the first sub-hole 231.

[0093] In the embodiment of the present application, the material around the first boss 21 is extruded along the protruding direction of the first boss 21 through the first sub-hole 231, which is beneficial to reducing the resistance of the stamping die to stamp out the first boss 21 in the second sub-hole 232, so that the first boss 21 can be stamped out to a higher height.

[0094] It can be understood that when projected along the thickness direction of the end cover 26, the projection area of the first boss 21 is not limited to being located within the projection area of the first sub-hole 231. Exemplarily, part of the projection area of the first boss 21 is located outside the projection area of the first sub-hole 231.

[0095] In one embodiment, please refer to Figure 5 , the hole wall surface of the second sub-hole 232 includes a first surface 233 and a second surface 234 that are connected to each other. The second surface 234 surrounds the first surface 233, and the range of the angle between the first surface 233 and the second surface 234 is 95° to 120°.

[0096] For the angle between the first surface 233 and the second surface 234, the plane coinciding with the central axis of the first boss 21 is used as the reference plane. The intersection line of the reference plane and the first surface 233 is the first reference line, and the intersection line of the reference plane and the second surface 234 is the second reference line. The angle between the first reference line and the second reference line is the angle between the first surface 233 and the second surface 234.

[0097] The angle between the first surface 233 and the second surface 234 is shown as TH1 in the figure.

[0098] Exemplarily, the side of the second surface 234 close to the electrode assembly 1 is arc-shaped.

[0099] Exemplarily, the angle between the first surface 233 and the second surface 234 is 95°, 100°, 110° or 120°.

[0100] In the embodiment of the present application, the range of the cone angle of the hole wall surface of the second sub-hole 232 is 95° to 120°, which can reduce the stretching degree of the hole wall of the second sub-hole 232 during the stamping process, reduce the resistance of the stamping die to stamp out the first boss 21 in the second sub-hole 232, and is beneficial to reducing the stamping difficulty.

[0101] It can be understood that the range of the included angle between the first surface 233 and the second surface 234 is not limited to 95° to 120°. Exemplarily, the included angle between the first surface 233 and the second surface 234 is 125°.

[0102] In one embodiment, please refer to Figure 1 、 Figure 4 and Figure 5 , the housing 2 includes a housing body 25 and an end cap 26. The end cap 26 is connected to the housing body 25. The electrode assembly 1 is located in the space surrounded by the housing body 25 and the end cap 26. The first boss 21 is formed on the end cap 26. The first boss 21 protrudes in the direction away from the electrode assembly 1 along the end cap 26. The counterbore 23 is located on the side of the end cap 26 facing the electrode assembly 1.

[0103] Exemplarily, the end cap 26 is formed by stamping.

[0104] In the embodiment of the present application, the first boss 21 is formed on the end cap 26. The conductive component 3 is in limiting contact with the first boss 21. The conductive component 3 is installed on the end cap 26. By providing the first sub-hole 231 and the second sub-hole 232, the resistance of the end cap 26 to stamping deformation is reduced, so that the first boss 21 can be stamped out to a higher height on the end cap 26, and the rotation of the conductive component installed on the end cap 26 can be restricted.

[0105] It can be understood that the first boss 21 is not limited to being formed on the end cap 26. Exemplarily, the first boss 21 is formed on the housing body 25.

[0106] In one embodiment, please refer to Figure 5 , the ratio of the depth of the first sub-hole 231 to the thickness of the end cap 26 is a first ratio, and the range of the first ratio is 0.2 to 0.5.

[0107] The depth of the first sub-hole 231 is shown as T2 in the figure, and the thickness of the end cap 26 is shown as T0 in the figure. The thickness of the end cap 26 does not include the depth of the recess 22.

[0108] Exemplarily, the first ratio is 0.2, 0.35, 0.4 or 0.5.

[0109] In the embodiment of the present application, the range of the ratio of the depth of the first sub-hole 231 to the thickness of the end cap 26 is 0.2 to 0.5, which can ensure that the structural strength of the end cap 26 at the first boss 21 basically meets the requirements, and facilitate stamping out a suitable height for the first boss 21.

[0110] It is understandable that the range of the first ratio is not limited to 0.2 to 0.5. Exemplarily, the range of the first ratio is 0.6.

[0111] In one embodiment, please refer to Figure 5 , the minimum distance between the hole wall surface of the second sub-hole 232 and the outer surface of the first boss 21 is a preset distance, and the ratio of the preset distance to the thickness of the end cap 26 is a second ratio, and the range of the second ratio is 0.35 to 0.8.

[0112] The preset distance is shown as T3 in the figure, and the thickness of the end cap 26 is shown as T0 in the figure.

[0113] Exemplarily, the second ratio is 0.35, 0.5, 0.7 or 0.8.

[0114] Exemplarily, the distance between the second surface 234 of the second sub-hole 232 and the outer surface of the first boss 21 is the smallest.

[0115] In the embodiment of the present application, the range of the ratio of the preset distance to the thickness of the end cap 26 is 0.35 to 0.8, so that the structural strength of the first boss 21 at the corner is basically satisfied, and it is convenient for the first boss 21 to be punched out to a more appropriate height.

[0116] It is understandable that the range of the second ratio is not limited to 0.35 to 0.8. Exemplarily, the second ratio is 0.9.

[0117] In one embodiment, please refer to Figure 3 and 5 , a recess 22 is formed on the side of the end cap 26 facing away from the electrode assembly 1, and the recess 22 and the first boss 21 enclose a sinking groove 24 surrounding the first boss 21, and the opening direction of the sinking groove 24 faces away from the electrode assembly 1.

[0118] Exemplarily, the recess 22 and the sinking groove 24 are formed by stamping.

[0119] In the embodiment of the present application, by providing the sinking groove 24 around the first boss 21, the side of the first boss 21 along the first direction is made as close as possible to being parallel to the first direction, reducing the possibility of the conductive component 3 slipping off the first boss 21, and enabling the first boss 21 to better limit the conductive component 3.

[0120] It is understandable that the sinking groove 24 may not be provided around the first boss 21. Exemplarily, the recess 22 is connected to the first boss 21.

[0121] In one embodiment, please refer to Figure 5 , the ratio of the depth of the sinking groove 24 to the thickness of the end cap 26 is a third ratio, and the range of the third ratio is 0.02 to 0.1.

[0122] The depth of the sinking groove 24 is shown as T1 in the figure, and the thickness of the end cover 26 is shown as T0 in the figure. The thickness of the end cover 26 does not include the depth of the recess 22.

[0123] Exemplarily, the third ratio is 0.02, 0.05, 0.08 or 0.1.

[0124] In the embodiment of the present application, the range of the third ratio is set to 0.02 to 0.1, which can limit the depth of the sinking groove 24. On the premise that the structural strength of the end cover 26 basically meets the requirements, the side of the first boss 21 along the first direction can be as close as possible to being parallel to the first direction.

[0125] It can be understood that the range of the third ratio is not limited to 0.02 to 0.1. Exemplarily, the range of the third ratio is 0.11.

[0126] In one embodiment, please refer to Figure 1 and Figure 3 , the shape of the sinking groove 24 is annular.

[0127] In the embodiment of the present application, the annular sinking groove 24 is convenient for processing and manufacturing on the outer shell 2, and the transition of the groove wall of the sinking groove 24 is relatively smooth, which is beneficial to reducing stress concentration.

[0128] It can be understood that the sinking groove 24 is not limited to being annular. Exemplarily, the sinking groove 24 is square.

[0129] In one embodiment, please refer to Figure 5 , the dimension that the first boss 21 protrudes from the end cover 26 in the thickness direction of the end cover 26 is the first dimension, and the ratio of the first dimension to the thickness of the end cover 26 is the fourth ratio, and the range of the fourth ratio is 0.8 to 1.5.

[0130] The first dimension is shown as H in the figure, and the thickness of the end cover 26 is shown as T0 in the figure. The first dimension does not include the depth of the recess 22, and the thickness of the end cover 26 does not include the depth of the recess 22.

[0131] Exemplarily, the fourth ratio is 0.08, 1.0, 1.3 or 1.5.

[0132] In the embodiment of the present application, the range of the ratio of the first dimension to the thickness of the end cover 26 is 0.8 to 1.5, which limits the size of the first dimension, reduces the possibility of the first boss 21 being disengaged from the conductive component 3, is beneficial to restricting the rotation of the conductive component 3, and the height of the first dimension is appropriate, which is convenient for processing the first boss 21.

[0133] It can be understood that the range of the fourth ratio is not limited to 0.8 to 1.5. Exemplarily, the range of the fourth ratio is 1.6.

[0134] In one embodiment, the material of the end cover 26 is steel.

[0135] In the embodiment of the present application, the material of the end cover 26 is steel, so that the end cover 26 is not easily deformed, the degree to which the strength of the end cover 26 is reduced by making the first boss 21 on the end cover 26 is reduced, and the structural strength of the end cover 26 is improved.

[0136] It is understood that the material of the end cap 26 is not limited to steel. Exemplarily, the material of the end cap 26 is aluminum.

[0137] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 The conductive component 3 includes an insulating member 31 and a conductive terminal 32. The insulating member 31 is located on the side of the shell 2 away from the electrode assembly 1. The insulating member 31 has an avoidance hole 312 and at least one second boss 311. Each second boss 311 is sleeved on the corresponding first boss 21. The conductive terminal 32 passes through the avoidance hole 312. The conductive terminal 32 is electrically connected to the electrode assembly 1. Each conductive terminal 32 is respectively sleeved on the corresponding second boss 311. The insulating member 31 is at least partially located between the conductive terminal 32 and the shell 2.

[0138] Exemplarily, the insulating member 31 is a plastic member.

[0139] Exemplarily, the number of the second bosses 311 is the same as the number of the first bosses 21 .

[0140] In the embodiment of the present application, the second boss 311 of the insulating member 31 is sleeved on the first boss 21 to increase the contact area between the insulating member 31 and the first boss 21 and prevent the insulating member 31 from detaching from the first boss 21. The conductive terminal 32 passes through the avoidance hole 312 of the insulating member 31 to strengthen the connection firmness between the conductive terminal 32 and the insulating member 31. The insulating member 31 is conducive to limiting the movement of the conductive terminal 32 relative to the first boss 21, and the insulating member 31 can also insulate the conductive terminal 32.

[0141] It is understandable that the conductive component 3 is not limited to the insulating member 31. Exemplarily, the conductive terminal 32 abuts against the housing 2.

[0142] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8The conductive terminal 32 includes a first conductive member 321 and a second conductive member 322. The first conductive member 321 passes through the avoidance hole 312. The first conductive member 321 is electrically connected to the electrode assembly 1. The second conductive member 322 is connected to the first conductive member 321. The second conductive member 322 is located on the side of the shell 2 away from the electrode assembly 1. The second conductive member 322 is sleeved on the corresponding second boss 311. The insulating member 31 is at least partially located between the second conductive member 322 and the shell 2.

[0143] In the embodiment of the present application, the second conductive member 322 is sleeved on the corresponding second boss 311, and the insulating member 31 is at least partially located between the second conductive member 322 and the housing 2. Through the cooperation of the second conductive member 322, the first conductive member 321 and the insulating member 31, the restriction on the movement of the conductive terminal 32 is strengthened.

[0144] It is understandable that the conductive terminal 32 may not be provided with the second conductive member 322. Exemplarily, the first conductive member 321 is sleeved on the corresponding second boss 311, and the insulating member 31 is at least partially located between the first conductive member 321 and the housing 2.

[0145] In one embodiment, please refer to Figures 1 to 8 The number of the first bosses 21 is at least two, and each conductive component 3 is in limited contact with at least two first bosses 21 respectively.

[0146] Exemplarily, the number of the first bosses 21 is two, three or four.

[0147] In the embodiment of the present application, at least two first bosses 21 are provided to limit the contact with the conductive component 3 , so that the conductive component 3 is limited at at least two different positions, which is beneficial to limit the rotation of the conductive component 3 .

[0148] It is understandable that the number of the first bosses 21 is not limited. Exemplarily, the number of the first bosses 21 is one.

[0149] The present application provides a stamping method, comprising the following steps:

[0150] The housing is arranged between a first stamping die and a second stamping die, wherein the first stamping die is formed with a cavity, the cavity is used to avoid the first boss 21, the second stamping die is formed with a first pressing head, the first pressing head includes a first sub-pressing head and a second sub-pressing head connected to each other, and the projection area of ​​the second sub-pressing head is located within the projection area of ​​the first sub-pressing head along the arrangement direction of the first sub-pressing head and the second sub-pressing head, the first sub-pressing head is used to punch out the first sub-hole 231, and the second sub-pressing head is used to punch out the second sub-hole 232 and the first boss 21;

[0151] Drive at least one of the first stamping die and the second stamping die to move towards the other to stamp the housing 2 between the first stamping die and the second stamping die.

[0152] In the embodiment of the present application, the first stamping die and the second stamping die cooperate. The first sub-punch punches a first sub-hole 231 in the housing, and the second sub-punch punches a second sub-hole 232 and a first boss 21 in the housing. Part of the first boss 21 is located in the cavity, which facilitates stamping the first sub-hole 231, the second sub-hole 232 and the first boss 21 into shape on the housing.

[0153] In one embodiment, the first stamping die further forms a second punch, and the second punch is used to punch a counterbore 24.

[0154] In the embodiment of the present application, the second punch facilitates punching a counterbore 24 on the side of the housing facing away from the second sub-hole.

[0155] In one embodiment, please refer to Figures 1 to 8, the housing 2 has at least one first boss 21 protruding in the direction away from the electrode assembly 1 of the housing 2 and a counterbore 23 corresponding to each first boss 21. The electrode assembly 1 is located inside the housing 2, the counterbore 23 is located on the side of the housing 2 facing the electrode assembly 1. The arrangement direction of the first boss 21 and the electrode assembly 1 is the first direction. The counterbore 23 has a first sub-hole 231 and a second sub-hole 232 that communicate with each other. The first sub-hole 231 is located on the side of the second sub-hole 232 facing the electrode assembly 1 along the first direction. The second sub-hole 232 is partially formed in the first boss 21. When projected along the first direction, the projected area of the second sub-hole 232 is at least partially located within the projected area of the first sub-hole 231. The conductive assembly 3 is at least partially electrically connected to the electrode assembly 1. The number of the conductive assemblies 3 is at least one. Each conductive assembly 3 is in limiting contact with at least one first boss 21 respectively. When projected along the first direction, the projected area of the first boss 21 is located within the projected area of the first sub-hole 231. The hole wall surface of the second sub-hole 232 includes a first surface 233 and a second surface 234 that are connected to each other. The second surface 234 surrounds the first surface 233. The range of the included angle between the first surface 233 and the second surface 234 is 95° to 120°. The housing 2 includes a housing body 25 and an end cap 26. The end cap 26 is connected to the housing body 25. The electrode assembly 1 is located in the space surrounded by the housing body 25 and the end cap 26. The first boss 21 is formed on the end cap 26. The first boss 21 protrudes in the direction away from the electrode assembly 1 of the end cap 26. The counterbore 23 is located on the side of the end cap 26 facing the electrode assembly 1. The ratio of the depth of the first sub-hole 231 to the thickness of the end cap 26 is a first ratio. The range of the first ratio is 0.2 to 0.5. The minimum distance between the hole wall surface of the second sub-hole 232 and the outer surface of the first boss 21 is a preset distance. The ratio of the preset distance to the thickness of the end cap 26 is a second ratio. The range of the second ratio is 0.35 to 0.8. A recess 22 is formed on the side of the end cap 26 away from the electrode assembly 1. The recess 22 and the first boss 21 surround a sink 24 that surrounds the first boss 21. The opening direction of the sink 24 is away from the electrode assembly 1. The ratio of the depth of the sink 24 to the thickness of the end cap 26 is a third ratio. The range of the third ratio is 0.02 to 0.1. The size by which the first boss 21 protrudes from the end cap 26 in the thickness direction of the end cap 26 is a first size. The ratio of the first size to the thickness of the end cap 26 is a fourth ratio. The range of the fourth ratio is 0.8 to 1.5. The shape of the sinking groove 24 is annular. The conductive component 3 includes an insulating member 31 and a conductive terminal 32. The insulating member 31 is located on the side of the housing 2 away from the electrode assembly 1. The insulating member 31 has an avoidance hole 312 and at least one second boss 311. Each second boss 311 is sleeved on the corresponding first boss 21. The conductive terminal 32 penetrates through the avoidance hole 312. The conductive terminal 32 is electrically connected to the electrode assembly 1. Each conductive terminal 32 is respectively sleeved on the corresponding second boss 311. The insulating member 31 is at least partially located between the conductive terminal 32 and the housing 2. The conductive terminal 32 includes a first conductive member 321 and a second conductive member 322. The first conductive member 321 penetrates through the avoidance hole 312. The first conductive member 321 is electrically connected to the electrode assembly 1. The second conductive member 322 is connected to the first conductive member 321. The second conductive member 322 is located on the side of the housing 2 away from the electrode assembly 1. The second conductive member 322 is sleeved on the corresponding second boss 311. The insulating member 31 is at least partially located between the second conductive member 322 and the housing 2. The material of the end cover 26 is steel. The number of the first bosses 21 is at least two. Each conductive component 3 is in limiting contact with at least two first bosses 21.

[0156] In the description of the present application, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in still other embodiments", or "exemplary", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of the different embodiments or examples.

[0157] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are all included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; A shell, having at least one first boss protruding in a direction of the shell away from the electrode assembly and a countersunk hole corresponding to each first boss, the electrode assembly is located in the shell, the countersunk hole is located on a side of the shell facing the electrode assembly, the first boss and the electrode assembly are arranged in a first direction, the countersunk hole has a first sub-hole and a second sub-hole that are interconnected, the first sub-hole is located along the first direction and the second sub-hole is located on a side of the electrode assembly, the second sub-hole is partially formed on the first boss, and the projection area of ​​the second sub-hole is at least partially located within the projection area of ​​the first sub-hole when projected along the first direction; A conductive component is at least partially electrically connected to the electrode component. The number of the conductive component is at least one, and each of the conductive components is respectively in limited contact with at least one of the first bosses.

2. The battery cell according to claim 1, characterized in that: Projected along the first direction, the projection area of ​​the first boss is located within the projection area of ​​the first sub-hole.

3. The battery cell according to claim 1, characterized in that: The hole wall surface of the second sub-hole includes a first surface and a second surface connected to each other, the second surface surrounds the first surface, and the angle between the first surface and the second surface ranges from 95° to 120°.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The housing comprises: case; The end cover is connected to the shell, and the electrode assembly is located in the space enclosed by the shell and the end cover. The first boss is formed on the end cover, and the first boss protrudes in the direction of the end cover away from the electrode assembly. The countersunk hole is located on the side of the end cover facing the electrode assembly.

5. The battery cell according to claim 4, characterized in that: The ratio of the depth of the first sub-hole to the thickness of the end cover is a first ratio, and the range of the first ratio is 0.2-0.

5.

6. The battery cell according to claim 4, characterized in that: The minimum distance between the hole wall surface of the second sub-hole and the outer surface of the first boss is a preset distance, and the ratio of the preset distance to the thickness of the end cover is a second ratio, and the range of the second ratio is 0.35-0.

8.

7. The battery cell according to claim 4, characterized in that: A recessed portion is formed on one side of the end cover away from the electrode assembly. The recessed portion and the first boss are configured to form a recessed groove surrounding the first boss. The opening direction of the recessed groove is away from the electrode assembly.

8. The battery cell according to claim 7, characterized in that: The ratio of the depth of the sink to the thickness of the end cover is a third ratio, and the range of the third ratio is 0.02 to 0.

1.

9. The battery cell according to claim 7, characterized in that: The sink is in the shape of a circular ring.

10. The battery cell according to claim 4, characterized in that: The dimension of the first boss protruding from the end cover along the thickness direction of the end cover is a first dimension, the ratio of the first dimension to the thickness of the end cover is a fourth ratio, and the range of the fourth ratio is 0.8-1.

5.

11. The battery cell according to claim 4, characterized in that: The material of the end cover is steel.

12. The battery cell according to any one of claims 1 to 3, characterized in that: The conductive component comprises: An insulating member, located at a side of the housing away from the electrode assembly, the insulating member having an avoidance hole and at least one second boss, each of the second bosses being sleeved on the corresponding first boss; A conductive terminal passes through the avoidance hole, the conductive terminal is electrically connected to the electrode assembly, each conductive terminal is respectively sleeved on the corresponding second boss, and the insulating member is at least partially located between the conductive terminal and the shell.

13. The battery cell according to claim 12, characterized in that: The conductive terminal comprises: A first conductive member, passing through the avoidance hole, wherein the first conductive member is electrically connected to the electrode assembly; The second conductive member is connected to the first conductive member, and is located on a side of the shell away from the electrode assembly. The second conductive member is sleeved on the corresponding second boss, and the insulating member is at least partially located between the second conductive member and the shell.

14. The battery cell according to any one of claims 1 to 3, characterized in that: The number of the first bosses is at least two, and each of the conductive components is in limited contact with at least two of the first bosses respectively.

15. A battery device, characterized in that: include: Box; The battery cell according to any one of claims 1 to 14, wherein the battery cell is mounted on the box.

16. An electrical device, characterized in that: include: Device body; The battery device according to claim 15, wherein the battery device is mounted on the device body.

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