Battery cover plate, battery, battery pack and electric equipment

Abstract

The invention provides a battery cover plate, a battery, a battery pack and electric equipment, and belongs to the technical field of batteries. The battery cover plate comprises a cover plate body, an insulating ring and a connecting ring, and the insulating ring is located between the cover plate body and the connecting ring. The cover plate body comprises a first end portion, a second end portion and a first supporting portion protruding from the second end portion to the first end portion, and the second end portion of the cover plate body is connected with the top face of the insulating ring. The connecting ring comprises a first connecting part, a second connecting part and a second supporting part protruding from the second connecting part to the first connecting part, the first connecting part is connected with the bottom surface of the insulating ring, and the second connecting part is used for being connected with a shell of the battery. The first supporting part and the second supporting part improve the structural strength of the cover plate body and the connecting ring, the welding stress and other stress in the subsequent use process are dispersed and transmitted, and the overall deformation resistance and stamping resistance of the battery are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and specifically to a battery cover, a battery, a battery pack, and an electrical device. Background Art

[0002] With the continuous advancement of battery technology and the growing market demand, the battery performance in new energy battery vehicles has received more and more attention, and the energy density and safety of batteries have become important indicators for measuring battery performance.

[0003] However, traditional battery cover designs typically utilize a riveted assembly of terminals, aluminum blocks, and lead tabs, resulting in low internal battery space utilization and impacting the volume utilization of the pack module. Furthermore, the terminal's cross-sectional area directly determines the maximum current the cover can carry. Due to the physical limitations of the battery's width, circular terminals are difficult to increase in size, limiting the cover's current-carrying capacity and, in turn, the battery's potential for higher-efficiency, faster charging. Summary of the Invention

[0004] The present invention provides a battery cover, battery, battery pack, and electrical equipment. By integrating the outer shell and battery cover into one body and using direct welding to connect the cell tabs, components such as a collector plate are eliminated, with the cover body acting as the terminal. Furthermore, the cover and connecting ring adopt a Z-shaped cross-section with varying wall thicknesses, optimizing the stress distribution between the cover, connecting ring, and outer shell, enhancing structural stability, and absorbing stress and deformation during welding and subsequent use.

[0005] The embodiments of the present application provide the following technical solutions to solve the above technical problems:

[0006] In the first part, the embodiment of the present application provides a battery cover, including:

[0007] A cover body, wherein the cover body has a first cavity therein, and the cover body comprises a cover body, an insulating ring, and a connecting ring, wherein the insulating ring is located between the cover body and the connecting ring;

[0008] The cover body includes a first end, a second end, and a first support portion extending from the second end toward the first end, and the second end of the cover body is connected to the top surface of the insulating ring;

[0009] The connecting ring includes a first connecting portion, a second connecting portion, and a second supporting portion extending from the second connecting portion to the first connecting portion. The first connecting portion is connected to the bottom surface of the insulating ring, and the second connecting portion is used to be connected to the battery shell.

[0010] Beneficial effects of the embodiments of the present application: The battery cover provided by the embodiments of the present application includes a cover body having a first cavity therein, the cover body including a cover body, an insulating ring, and a connecting ring. The insulating ring is located between the cover body and the connecting ring to achieve mutual insulation between the cover body and the connecting ring. The cover body includes a first end, a second end, and a first support portion extending from the second end to the first end. The second end of the cover body is connected to the top surface of the insulating ring. The connecting ring includes a first connecting portion, a second connecting portion, and a second supporting portion extending from the second connecting portion to the first connecting portion. The first connecting portion is connected to the bottom surface of the insulating ring, and the second connecting portion is used to connect to the battery housing. In this way, the first and second ends of the cover body are connected by the first supporting portion, and the first and second connecting portions of the connecting ring are connected by the second supporting portion. The first and second supporting portions improve the structural strength of the cover body and the connecting ring, preventing damage to the cover body and the connecting ring from welding stress generated during welding, as well as damage to the cover body and the connecting ring from stress in the external environment during use. It can be understood that the cover body is through the first support part, and the connecting ring is through the second support part to disperse and transmit stress, reduce local stress concentration, thereby enhancing the overall stability and reliability of the structure and improving the overall deformation resistance and stamping resistance of the battery.

[0011] In one possible embodiment, the first support portion is inclined, and the distance between the inner walls of the first support portion gradually increases from the first end to the second end. This creates a gradual transition zone on the cover body through the first support portion, which helps to disperse and balance the stress generated or subjected to various stresses during battery production and use.

[0012] In one possible embodiment, a boss is provided on the first end portion, the boss being located within the first cavity and configured to connect to the battery tab. This provides a stable contact surface for the tab, ensuring a precise connection between the tab and the cover plate body, and also helps reduce the possibility of poor contact or loosening between the tab and the cover plate body due to welding difficulties.

[0013] In a possible implementation manner, the boss and the cover plate body are integrally stamped.

[0014] In one possible embodiment, the maximum thickness of the cover plate body along the height direction of the cover body is H1, and 0.6mm≤H1≤3.0mm. This can limit the thickness range of the cover plate body. An appropriate cover plate body thickness can ensure sufficient mechanical strength and corrosion resistance while reducing battery weight and increasing energy density.

[0015] In one possible embodiment, along the height of the cover, the sum of the maximum thickness of the boss and the first end portion is H2, and 0.6 mm ≤ H2 ≤ 5.0 mm. This limits the thickness of the weld area between the boss and the battery tab, ensuring tab welding quality and avoiding the possibility of weld leaks caused by poor weld appearance. A suitable weld area thickness can also improve space utilization within the battery's internal structure and reduce the weight and cost of structural components.

[0016] In one possible embodiment, the minimum width of the second end of the cover body along the width direction of the cover is L1, and 0.5 mm ≤ L1 ≤ 5.0 mm. This limits the width of the second end of the cover body, ensuring full contact and a tight connection between the cover body and the top surface of the insulating ring, effectively preventing electrolyte leakage or impurities from the external environment from entering the battery.

[0017] In a possible embodiment, the second supporting portion is arranged obliquely, and along the height direction of the cover body, the first connecting portion connected to one end of the second supporting portion is higher than the second connecting portion connected to the other end of the second supporting portion.

[0018] In one possible embodiment, the connecting ring is further provided with a protrusion, located on a surface facing the second connecting portion and positioned within the battery housing. This protrusion ensures a stable connection between the battery housing and the connecting ring, simplifying the assembly process while also improving assembly precision, sealing, and structural durability.

[0019] In one possible embodiment, the minimum width of the first connecting portion along the width direction of the cover is L2, and 0.5 mm ≤ L2 ≤ 5.0 mm. This limits the width of the first connecting portion of the connecting ring, ensuring full contact between the connecting ring and the bottom surface of the insulating ring, forming a tight connection and effectively preventing electrolyte leakage or impurities from the external environment from entering the battery.

[0020] In one possible embodiment, the shortest distance between the outer side of the second connecting portion and the side of the battery casing facing the protrusion is X1, and -0.5mm≤X1-X2≤1.8mm, where X2 is the thickness of the battery casing. In this way, by controlling the distance between the inner sidewall of the battery casing and the outer sidewall of the protrusion on the connecting ring, the assembly clearance between the battery cover and the battery casing is ensured, meeting the requirements during subsequent battery use.

[0021] In a possible implementation manner, a first notch is provided on the insulating ring. The first notch is located on an inner side surface of the insulating ring facing the first cavity and close to a top of the insulating ring.

[0022] In a possible implementation manner, a second notch is further provided on the insulating ring. The second notch is located on the inner side surface of the insulating ring facing the first cavity and close to the bottom of the insulating ring.

[0023] In one possible embodiment, the height of the insulating ring along the height direction of the cover is H3, and 2.0mm≤H3≤4.0mm. In this way, controlling the height of the insulating ring can ensure the insulation performance and structural strength of the insulating ring while taking into account the rational use of the internal space of the battery.

[0024] In one possible embodiment, the wall thickness of the insulating ring is L3, and is between 4.0 mm ≤ L3 ≤ 12.0 mm. In this way, controlling the wall thickness of the insulating ring can ensure the insulation performance and structural strength of the insulating ring while taking into account the rational use of the internal space of the battery.

[0025] In the second part, the embodiment of the present application further provides a battery, including:

[0026] A housing having a second cavity therein and openings at both ends of the housing communicating with the second cavity;

[0027] At least one battery cover as described above, wherein the battery cover is connected to at least one end of the housing, and the first cavity of the battery cover is in communication with the second cavity of the housing;

[0028] The battery cell is located in the second cavity, and pole tabs are respectively provided at both ends of the battery cell, and the pole tab at at least one end is electrically connected to the cover body of the battery cover.

[0029] In one possible embodiment, at least a portion of the tab is located within the first cavity, and one end of the tab is electrically connected to the surface of the cover body's boss facing the first cavity. This allows for more efficient use of internal battery space, resulting in a more compact overall battery structure, which helps reduce battery volume and weight and improve energy density. Directly connecting the top of the tab to the cover body's boss reduces resistance and energy loss in the electrical connection path.

[0030] In one possible embodiment, the wall thickness of the housing is X2, and is within the range of 0.075 mm ≤ X2 ≤ 1.0 mm. This limits the range of housing thickness. An appropriate housing wall thickness can ensure sufficient mechanical strength and corrosion resistance while reducing battery weight and increasing energy density. It should be noted that the housing wall thickness can be adjusted based on actual operating conditions.

[0031] In the third part, the embodiment of the present application further provides a battery pack, including:

[0032] The battery mentioned above.

[0033] In the fourth part, the embodiment of the present application further provides an electric device, including:

[0034] An electrical device, and the above-mentioned battery pack or the above-mentioned battery, wherein the battery pack or the battery is used to provide electrical energy to the electrical device.

[0035] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery cover, battery, battery pack and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are only part of the embodiments of the present application. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 A schematic diagram of the structure of the battery cover provided in an embodiment of the present application;

[0038] Figure 2 An exploded view of a battery cover provided in an embodiment of the present application;

[0039] Figure 3 A partial schematic diagram of a battery cover provided in an embodiment of the present application;

[0040] Figure 4 A cross-sectional view of a battery cover provided in an embodiment of the present application;

[0041] Figure 5 A cross-sectional view of a battery cover provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100-housing; 200-cover;

[0044] 110 - second cavity; 210 - cover body; 220 - insulation ring; 230 - connecting ring; 240 - first cavity;

[0045] 211 - first end portion; 212 - second end portion; 213 - first supporting portion; 214 - boss;

[0046] 221-first gap; 222-second gap;

[0047] 231 - first connecting portion; 232 - second connecting portion; 233 - second supporting portion; 234 - protrusion. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] Figure 1 This is a schematic diagram of the structure of the battery cover provided in an embodiment of the present application. Figure 2 This is an exploded view of the battery cover provided in an embodiment of the present application. Figure 3 A partial schematic diagram of a battery cover provided in an embodiment of the present application, Figure 4 A cross-sectional view of a battery cover provided in an embodiment of the present application, Figure 5 A cross-sectional view of a battery cover provided in an embodiment of the present application.

[0050] An embodiment of the present application provides an electric device, which includes an electric device and a battery pack or battery, and the battery pack or battery provides electric energy to the electric device. For example, the electric device can be a vehicle or an energy storage device. When the electric device is a vehicle, the vehicle can be an electric vehicle / electric vehicle, a fuel vehicle, or a hybrid vehicle. The electric device can be an electric motor, a control system, a lighting system, etc. When the electric device is an energy storage device, the electric device can be an inverter, a controller, etc. The battery pack can include multiple batteries. In one possible implementation, the battery can be a cylindrical battery, or the battery can be a square-shell battery, or the battery has several cells inside. And multiple batteries can realize the storage and output of electric energy through a certain connection method and control system, and the battery pack or battery can provide electric energy to the electric device to meet the normal operation of the device.

[0051] The present application embodiment provides a battery, such as Figure 1 and Figure 4As shown, it includes a housing 100, at least one battery cover, and a battery cell (not shown in the figure). The housing 100 has a second cavity 110 inside, and both ends of the housing 100 have openings connected to the second cavity 110. The battery cover is connected to at least one end of the housing 100, and the first cavity 240 of the battery cover is connected to the second cavity 110 of the housing 100. The battery cell is located in the second cavity 110, and the battery cell is provided with a tab at each end, and the tab at at least one end is electrically connected to the cover body 210 of the battery cover.

[0052] It is understood that the housing 100 has a second cavity 110 inside. The second cavity 110 encloses and secures the battery cells, tabs, and other components, thereby protecting the battery cells and tabs from mechanical damage caused by external vibrations, impacts, etc. Openings are provided at both ends of the housing 100, communicating with the second cavity 110. The tabs can be led out through the openings and electrically connected to the battery cover.

[0053] In one possible implementation, only one end of the housing 100 is connected to the battery cover of this embodiment, and the other end of the housing 100 is not limited. In another possible implementation, both ends of the housing 100 are connected to the battery cover of this embodiment. The battery cover has a first cavity 240 inside, which is connected to the second cavity 110 through the opening of the housing 100, and together accommodates the battery's tabs and other components. Through the close fit between the battery cover and the housing 100, it can also ensure that the battery cells and tabs operate in a sealed environment, effectively preventing electrolyte leakage or external gas or liquid intrusion, thereby ensuring the integrity and stability of the internal structure of the battery.

[0054] In some embodiments of the present application, at least a portion of the tab is located within the first cavity 240, and one end of the tab is electrically connected to the side of the boss 214 of the cover body 210 that faces the first cavity 240. It will be appreciated that placing at least a portion of the tab within the first cavity 240 of the top cover can more efficiently utilize the space within the battery, making the overall battery structure more compact, thereby reducing the battery's volume and weight and increasing its energy density. Electrically connecting the top end of the tab to the boss 214 of the cover body 210 can reduce resistance and energy loss in the electrical connection path.

[0055] In some embodiments of the present application, Figure 4 and Figure 5As shown, the wall thickness of the housing 100 is X2, and 0.075mm≤X2≤1.0mm. For example, X2 can be 0.075mm, 0.1mm, 0.5mm, or 1.0mm. In this way, the thickness range of the housing 100 can be limited. A suitable wall thickness of the housing 100 can ensure sufficient mechanical strength and corrosion resistance while reducing battery weight and increasing energy density. It should be noted that the wall thickness of the housing 100 can be adjusted according to actual operating conditions.

[0056] It should be noted that the shell 100 can be formed by stamping or bending and then welding. The preferred material can be aluminum or steel, etc., but it is not limited to the above materials. For example, a composite steel-aluminum material or a metal conductive material that does not react with the electrolyte inside the battery can also be used.

[0057] The embodiment of the present application provides a battery cover, such as Figures 1 to 4 As shown, the battery comprises a cover 200 having a first cavity 240 therein. The cover 200 comprises a cover body 210, an insulating ring 220, and a connecting ring 230. The insulating ring 220 is located between the cover body 210 and the connecting ring 230. The cover body 210 comprises a first end 211, a second end 212, and a first supporting portion 213 extending from the second end 212 to the first end 211. The second end 212 of the cover body 210 is connected to the top surface of the insulating ring 220. The connecting ring 230 comprises a first connecting portion 231, a second connecting portion 232, and a second supporting portion 233 extending from the second connecting portion 232 to the first connecting portion 231. The first connecting portion 231 is connected to the bottom surface of the insulating ring 220, and the second connecting portion 232 is used to connect to the battery housing 100.

[0058] In this way, the integrated design of the cover body 210, the insulating ring 220 and the connecting ring 230 is adopted to replace the conventional multi-component cover structure of the battery shell, reducing the coordination and assembly steps between components, thereby improving the assembly efficiency. The cover body 210 and the connecting ring 230 are respectively designed to have a "Z-shaped" structure in cross section, and the connection requirements are met by designing the wall thickness of different areas. It is understandable that the "Z-shaped" structure mentioned in the embodiment of the present application can be specifically Figure 4 For example, the second end portion 212, the first support portion 213 and the first end portion 211 on the left side are connected to form a Z-shaped structure, which is not completely Z-shaped, nor is the cover body 210 as shown in FIG. Figure 4 The structure presented in cross section.

[0059] Specifically, the second end 212 of the cover body 210 extends toward the first end 211 via the inclined first support portion 213. The first end 211 is higher than the second end 212 along the height direction of the cover body 200. The second connection portion 232 of the connecting ring 230 extends toward the first connection portion 231 via the inclined second support portion 233. The first connection portion 231 is higher than the second connection portion 232 along the height direction of the cover body 200. In other words, the turning points of the "Z-shaped" structure of the cover body 210 are the connection points between the first support portion 213 and the first end 211, and the connection points between the first support portion 213 and the second end 212. The turning points of the "Z-shaped" structure of the connecting ring 230 are the connection points between the second support portion 233 and the first connection portion 231, and the connection points between the second support portion 233 and the first connection portion 231.

[0060] The cover body 210 has a first end 211 and a second end 212, wherein the first end 211 is used to connect to the battery's tab, serving as the input and output point for current. The second end 212 is located at the other end opposite the first end 211, and the second end 212 is tightly connected to the top surface of the insulating ring 220 to form a seal. A first support portion 213 is also provided between the first end 211 and the second end 212. The first support portion 213 can provide additional support strength, which is conducive to enhancing the overall stability of the cover body 210. It acts as a buffer when external force squeezes or collides with the battery during use, absorbing some of the impact energy, providing reliable protection and stable performance support for the battery.

[0061] The connecting ring 230 has a first connecting portion 231 and a second connecting portion 232. The first connecting portion 231 is used to tightly connect with the bottom surface of the insulating ring 220 to form a seal, and the second connecting portion 232 is used to tightly connect with the battery housing 100 to form a seal, effectively preventing the infiltration of gas, liquid, or impurities from the external environment. A second supporting portion 233 is also provided between the first connecting portion 231 and the second connecting portion 232. This provides additional support strength for the connecting ring 230, helps enhance the overall stability of the connecting ring 230, and helps disperse and absorb thermal stress generated during the welding process, thereby avoiding failure of the connecting ring 230 and the insulating ring 220 due to thermal effects.

[0062] It should be noted that in another possible implementation, the first connecting portion 231 is directly connected to the second connecting portion 232. The first connecting portion 231 is used to absorb the thermal stress generated during the welding of the connecting ring 230 and the insulating ring 220, while the second connecting portion 232 is used to absorb the thermal stress generated during the welding of the connecting ring 230 and the outer shell 100, thereby preventing battery deformation caused by welding problems. The cross-section of the cover body 210 and the connecting ring 230 can adopt a "Z-shaped" structure, but is not limited to this structure. Any structural solution that can absorb stress and deformation is acceptable.

[0063] The insulating ring 220 is located between the cover body 210 and the connecting ring 230, providing isolation and insulation to prevent safety hazards such as short circuits or leakage within the battery. At the same time, the insulating ring 220 has sufficient mechanical strength to withstand vibrations and impacts that may occur during battery operation. It should be noted that the insulating ring 220 can preferably be made of ceramic, but is not limited to ceramic materials. For example, other insulating materials such as PPS injection molding materials and glass can also be used. Furthermore, the top of the insulating ring 220 is connected to the second end 212 of the cover body 210, and the bottom of the insulating ring 220 is connected to the top surface of the connecting ring 230. The cover body 210, the insulating ring 220, and the connecting ring 230 together form a first cavity 240, allowing a portion of the tab to be electrically connected to the boss 214 of the cover body 210 within the first cavity 240. This helps to compress the internal volume of the battery while ensuring battery reliability and safety, making the battery more compact and integrated.

[0064] It should be noted that the cover body 210 and the connecting ring 230 can be made of metal, such as aluminum, copper or any other material, as long as it meets the design requirements, and there is no limitation here.

[0065] In some embodiments of the present application, Figure 4 As shown, the first support portion 213 is tilted, for example, Figure 4 In the embodiment, the first support portion 213 is inclined toward the first end portion 211. Furthermore, the inner diameter of the first support portion 213 gradually increases from the first end portion 211 to the second end portion 212. This creates a gradual transition zone on the cover body 210 through the first support portion 213, which helps to disperse and balance the stresses generated or experienced by the battery during production and use. For example, when the battery is subjected to external forces, such as expansion and contraction caused by vibration, impact, or temperature changes, the inclined first support portion 213 can more effectively absorb and disperse these forces, thereby enhancing the stability of the entire battery cover.

[0066] It is understandable that when the first support portion 213 adopts a straight-wall design, stress concentration may occur at the corners, while the inclined design of the first support portion 213 helps to disperse these stresses, reduce the possibility of material fatigue and failure caused by stress concentration, and is of great significance to improving the reliability and service life of the battery.

[0067] In some embodiments of this application, please refer to Figure 4 A boss 214 is provided on the first end 211. The boss 214 is located within the first cavity 240. The boss 214 and the cover body 210 are integrally stamped and formed. The boss 214 is used to connect to the battery tab. This provides a stable contact surface for the tab, ensuring a precise connection between the tab and the cover body 210. It also helps reduce the possibility of poor contact or loosening between the tab and the cover body 210 due to welding difficulties.

[0068] It is understood that the boss 214 is used to connect to the battery's tab, establishing an electrical connection with the external circuit. Tightly securing the tab through the bottom surface of the boss 214 ensures that the battery can stably output electrical energy to meet the operating requirements of the device. The boss 214 is positioned on the side of the cover body 210 where the first end 211 faces the first cavity 240 and is integrally stamped, enhancing the connection strength between the boss 214 and the cover body 210, making the entire structure more durable.

[0069] In some embodiments of the present application, Figure 4 and Figure 5 As shown, along the height direction of the cover body 200, the maximum thickness of the cover body 210 is H1, and 0.6mm≤H1≤3.0mm. For example, H1 can be 0.6mm, 1.1mm, 2.5mm or 3.0mm. In this way, the thickness range of the cover body 210 can be limited. The appropriate thickness of the cover body 210 can ensure that the battery weight is reduced and the energy density is improved on the basis of providing sufficient mechanical strength and corrosion resistance. It should be noted that the thickness of the cover body 210 can be adjusted according to the actual working conditions. In one possible implementation, the cover body 210 can be directly stamped from a metal plate. In this case, the maximum thickness H1 of the cover body 210 is the thickness of the metal plate. In another possible implementation, the cover body 210 can be welded from multiple metal plates. In this case, the maximum thickness H1 of the cover body 210 is the maximum thickness of the metal plate.

[0070] It is understood that when the thickness of the cover plate body 210 is relatively thin, for example, less than 0.6 mm, the structural strength of the cover plate body 210 may not be able to withstand the mechanical stress or impact to the battery during normal use, which may cause the cover plate body 210 to deform, crack, or even fail, thereby affecting the overall safety and reliability of the battery. When the thickness of the cover plate body 210 is relatively thick, for example, greater than 3.0 mm, the cover plate body 210 can provide sufficient structural strength, but it will also increase the overall weight and cost of the battery, and increase the difficulty of welding when ceramic brazing with the insulating ring 220. At the same time, the thicker cover plate body 210 may also affect the heat dissipation performance of the battery during subsequent use.

[0071] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the maximum sum of the thicknesses of the boss 214 and the first end 211 is H2, with 0.6 mm ≤ H2 ≤ 5.0 mm. For example, H2 can be 0.6 mm, 2.5 mm, 4.0 mm, or 5.0 mm. This limits the thickness of the weld area between the boss 214 and the battery tab, ensuring the quality of the tab weld and avoiding the possibility of weld leaks caused by poor weld appearance. A suitable weld area thickness can also improve the space utilization of the battery's internal structure and reduce the weight and cost of structural components.

[0072] It should be noted that the sum of the maximum thickness of the boss 214 and the first end 211 is the thickness of the welding area of the tab. In other words, the sum of the maximum thickness of the boss 214 and the first end 211 is the maximum distance between the side of the boss 214 facing the accommodating cavity and the side of the first end 211 facing away from the accommodating cavity. When the thickness of the welding area is thin, for example, less than 0.6 mm, the subsequent thickness of the welding area is smaller than the thickness of the cover body 210, and the first end 211 forms a depression, which may cause the tab welding to be loose. There is even the possibility of electrolyte leakage due to welding through. When the thickness of the welding area is thick, for example, greater than 5.0 mm, the thicker welding area will not only increase the weight and cost of the structure, but also fail to maximize the use of the limited battery space, resulting in a waste of internal battery space.

[0073] When the boss 214 and the cover body 210 are made of copper or steel, the sum of the thicknesses H2 of the boss 214 and the first end portion 211 preferably ranges from 0.6 to 2.5 mm, inclusive. When the boss 214 and the cover body 210 are made of aluminum, the sum of the thicknesses H2 of the boss 214 and the first end portion 211 preferably ranges from 1.5 to 3.8 mm, inclusive.

[0074] In some embodiments of the present application, Figure 4 and Figure 5As shown, along the width direction of the cover body 200, the minimum width of the second end 212 of the cover body 210 is L1, and 0.5mm≤L1≤5.0mm. For example, L1 can be 0.5mm, 2.5mm, 4.0mm or 5.0mm. In other words, the minimum distance between the outer side and the inner side of the second end 212 is L1. In this way, the width of the second end 212 of the cover body 210 can be limited to ensure sufficient contact between the cover body 210 and the top surface of the insulating ring 220, forming a tight connection, and effectively preventing electrolyte leakage or impurities from the external environment from entering the battery.

[0075] It is understood that when the width L1 of the second end portion 212 is small, such as less than 0.5 mm, the connection strength and sealing performance between the cover body 210 and the insulating ring 220 may be affected. When the width L1 of the second end portion 212 is large, such as greater than 5.0 mm, material consumption and welding difficulty may increase.

[0076] The second end 212 of the cover body 210 is positioned over the opening of the insulating ring 220, and the inner edge of the second end 212 is also positioned over the opening of the insulating ring 220, ensuring sufficient contact between the bottom surface of the second end of the cover body 210 and the top surface of the insulating ring 220, forming a tight connection. By limiting the width L1 of the second end 212, sufficient contact area is ensured between the cover body 210 and the top surface of the insulating ring 220, thereby achieving a tighter connection. This sufficiently tight connection also ensures that the battery cover can withstand certain mechanical stresses and pressures, providing the cover body 210 with sufficient structural strength to resist external impacts and changes in internal pressure.

[0077] In some embodiments of the present application, Figure 3 and Figure 4 As shown, the connecting ring 230 is further provided with a protrusion 234, which is located on the side facing the second connecting portion 232 and is located inside the battery housing 100. In this way, the protrusion 234 can ensure the connection stability between the battery housing 100 and the connecting ring 230, which not only simplifies the assembly process but also improves the assembly accuracy, sealing and structural durability.

[0078] It is understood that the protrusion 234 on the connecting ring 230 can serve as a support point for the battery housing 100, so that the top opening of the housing 100 is firmly fixed on the protrusion 234 of the connecting ring 230. This is not only conducive to the positioning and identification during the subsequent welding between the housing 100 and the connecting ring 230, but also avoids displacement during the welding process. The bottom surface of the connecting ring 230 and the top surface of the housing 100, and the outer side surface of the protrusion 234 and the inner side surface of the housing 100 are in contact to achieve a double connection. It can also effectively disperse the deformation of the connection between the battery housing 100 and the connecting ring 230 caused by external force collision during subsequent use of the battery, reduce the possibility of loosening or damage, and ensure the stable operation of the battery.

[0079] Further welding the connecting ring 230 to the outer shell 100 can also ensure the sealing of the battery. The close fit between the outer shell 100 and the protrusion 234 can further effectively prevent moisture, dust and other harmful substances in the external environment from invading the interior of the battery. At the same time, it can also prevent substances such as the electrolyte inside the battery from leaking into the external environment, thereby extending the service life of the battery.

[0080] In some embodiments of the present application, Figure 4 and Figure 5 As shown, along the width direction of the cover body 200, the minimum width of the first connecting portion 231 is L2, and 0.5mm≤L2≤5.0mm. For example, L2 can be 0.5mm, 2.5mm, 4.0mm or 5.0mm. That is to say, the minimum distance between the outer side and the inner side of the first connecting portion 231 is L2. In this way, the width of the first connecting portion 231 of the connecting ring 230 can be limited to ensure sufficient contact between the connecting ring 230 and the bottom surface of the insulating ring 220 to form a tight connection, effectively preventing electrolyte leakage or impurities from the external environment from entering the interior of the battery. It can be understood that the range of the width L2 of the first connecting portion 231 is the same as the width L1 of the second end portion 212 of the cover body 210, and its function will not be repeated.

[0081] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the shortest distance between the outer side of the second connecting portion 232 and the side of the protrusion 234 facing the battery housing 100 is X1, and -0.5mm≤X1-X2≤1.8mm, where X2 is the thickness of the battery housing 100. In this way, by controlling the distance between the inner sidewall of the battery housing 100 and the outer sidewall of the protrusion 234 on the connecting ring 230, the assembly clearance between the battery cover 200 and the battery housing 100 is ensured, meeting the requirements during subsequent use of the battery.

[0082] It should be noted that when X1-X2>0mm, for example, 0.5mm, 1mm, or 1.8mm, a certain gap exists between the inner sidewall of the housing 100 and the outer sidewall of the protrusion 234 of the connecting ring 230. In certain circumstances, this can meet the installation requirements of the connecting ring 230 and the housing 100. The gap provides sufficient space to accommodate minor changes caused by thermal expansion, mechanical vibration, or other external environmental factors, thereby avoiding stress concentration or damage caused by overly tight contact. It also provides additional buffer space, helping to reduce damage to the connecting ring 230 and the housing 100 due to external impact or vibration.

[0083] When X1-X2=0mm, the inner wall of the outer shell 100 is in contact with the outer wall of the protrusion 234 of the connecting ring 230 without a gap, which can ensure the compactness of the internal structure of the battery and reduce unnecessary space waste. In addition, it also improves the overall strength of the battery to a certain extent and prevents external environmental factors such as moisture or dust from entering the battery through the gap and causing damage to the battery.

[0084] When X1-X2 is less than 0 mm, for example, -0.1 mm, -0.3 mm, or -0.5 mm, an interference fit is formed between the inner wall of the housing 100 and the outer wall of the protrusion 234 of the connecting ring 230, ensuring close contact and interference between the protrusion 234 on the connecting ring 230 and the inner wall of the housing 100, thereby improving the integration and sealing performance of the battery's internal space. This also helps to enhance the connection strength between the connecting ring 230 and the housing 100, improving the overall structural stability of the battery.

[0085] In some embodiments of the present application, Figure 3 and Figure 4 As shown, the insulating ring 220 is provided with a first notch 221, which is located on the inner side of the insulating ring 220 facing the first cavity 240 and close to the top of the insulating ring 220. The insulating ring 220 is also provided with a second notch 222, which is located on the inner side of the insulating ring 220 facing the first cavity 240 and close to the bottom of the insulating ring 220.

[0086] In an embodiment of the present application, the top surface of the cover plate body 210 and the insulating ring 220 are connected by ceramic brazing, and the connecting ring 230 and the bottom surface of the insulating ring 220 are also connected by ceramic brazing. It should be noted that ceramic brazing is a high-temperature connection technology that uses brazing material to melt and wet the ceramic and metal surfaces at high temperatures, and forms a strong connection after cooling and solidification. The use of ceramic brazing for connection can ensure a close connection between the cover plate body 210 and the insulating ring 220, and between the connecting ring 230 and the insulating ring 220, to prevent electrolyte leakage or external gas from entering the interior of the battery. By providing a first notch 221 and a second notch 222, it can be used to store brazing material to prevent the brazing material from melting during heating and flowing down along the inner wall of the insulating ring 220, thereby improving the connection quality of the ceramic brazing and the overall performance of the battery.

[0087] In some embodiments of the present application, Figure 4 and Figure 5 As shown, along the height direction of the cover body 200, the height of the insulating ring 220 is H3, and 2.0mm≤H3≤4.0mm. For example, H3 can be 2.0mm, 2.5mm, 3.5mm or 4.0mm. The wall thickness of the insulating ring 220 is L3, and between 4.0mm≤L3≤12.0mm. For example, L3 can be 4.0mm, 5.5mm, 9.5mm or 12.0mm. In this way, controlling the height and thickness of the insulating ring 220 can ensure the insulation performance and structural strength of the insulating ring 220 while taking into account the rational use of the internal space of the battery.

[0088] It is understood that the appropriate height of the insulating ring 220 can ensure sufficient insulation distance, effectively preventing the battery's tabs from making unnecessary contact with the outer shell 100 and the connecting ring 230, thereby preventing a short circuit inside the battery. The tabs of the battery cell are connected to the boss 214 of the cover body 210 after being led out. In addition to the insulation protection of the insulating ring 220, the lead-out position of the battery cell and the tabs can be wrapped with an insulating film or insulating tape to prevent the battery cell and the tabs from contacting the outer shell 100 and the connecting ring 230, thereby preventing a short circuit inside the battery. The appropriate wall thickness of the insulating ring 220 can ensure the insulation effect and also provide sufficient mechanical strength. The insulating ring 220 can withstand various mechanical forces from inside and outside the battery, such as pressure and vibration during assembly, thereby improving the insulating ring 220's ability to resist deformation and impact.

[0089] Among them, the terms "upper" and "lower" are used to describe the relative position relationship of each structure in the accompanying drawings, which is only for the convenience of description and is not used to limit the scope of implementation of this application. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of this application without substantially changing the technical content.

[0090] It should be noted that, in this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0091] Furthermore, in this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," and the like should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0092] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover, characterized in that: include: A cover body (200), wherein the cover body (200) has a first cavity (240) therein, and the cover body (200) comprises a cover body (210), an insulating ring (220) and a connecting ring (230), wherein the insulating ring (220) is located between the cover body (210) and the connecting ring (230); The cover body (210) comprises a first end (211), a second end (212), and a first support portion (213) extending from the second end (212) toward the first end (211); the second end (212) of the cover body (210) is connected to the top surface of the insulating ring (220); The connecting ring (230) comprises a first connecting portion (231), a second connecting portion (232), and a second supporting portion (233) extending from the second connecting portion (232) to the first connecting portion (231), wherein the first connecting portion (231) is connected to the bottom surface of the insulating ring (220), and the second connecting portion (232) is used to be connected to the outer shell (100) of the battery.

2. The battery cover according to claim 1, characterized in that: The first supporting portion (213) is arranged at an angle, and the distance between the inner walls of the first supporting portion (213) gradually increases in the direction from the first end portion (211) to the second end portion (212).

3. The battery cover according to claim 1, characterized in that: A boss (214) is provided on the first end portion (211), the boss (214) is located in the first cavity (240), and the boss (214) is used to be connected to a tab of the battery.

4. The battery cover according to claim 3, characterized in that: The boss (214) and the cover plate body (210) are integrally stamped.

5. The battery cover according to any one of claims 1 to 4, characterized in that: Along the height direction of the cover body (200), the maximum thickness of the cover plate body (210) is H1, and 0.6 mm ≤ H1 ≤ 3.0 mm.

6. The battery cover according to claim 3, characterized in that: Along the height direction of the cover body (200), the sum of the maximum thicknesses of the boss (214) and the first end portion (211) is H2, and 0.6 mm ≤ H2 ≤ 5.0 mm.

7. The battery cover according to any one of claims 1 to 4, characterized in that: Along the width direction of the cover body (200), the minimum width of the second end portion (212) of the cover plate body (210) is L1, and 0.5 mm ≤ L1 ≤ 5.0 mm.

8. The battery cover according to any one of claims 1 to 4, characterized in that: The second supporting portion (233) is arranged to be inclined, and along the height direction of the cover body (200), the first connecting portion (231) connected to one end of the second supporting portion (233) is higher than the second connecting portion (232) connected to the other end of the second supporting portion (233).

9. The battery cover according to any one of claims 1 to 4, characterized in that: The connecting ring (230) is further provided with a protrusion (234), the protrusion (234) is located on one surface of the second connecting portion (232), and the protrusion (234) is located inside the battery housing (100).

10. The battery cover according to any one of claims 1 to 4, characterized in that: Along the width direction of the cover body (200), the minimum width of the first connecting portion (231) is L2, and 0.5 mm ≤ L2 ≤ 5.0 mm.

11. The battery cover according to claim 9, characterized in that: The shortest distance between the outer side surface of the second connecting portion (232) and the side surface of the protrusion (234) facing the battery housing (100) is X1, and -0.5mm≤X1-X2≤1.8mm, where X2 is the thickness of the battery housing (100).

12. The battery cover according to claim 1, characterized in that: The insulating ring (220) is provided with a first notch (221), and the first notch (221) is located on the inner side surface of the insulating ring (220) facing the first cavity (240) and close to the top of the insulating ring (220).

13. The battery cover according to claim 12, characterized in that: The insulating ring (220) is further provided with a second notch (222), and the second notch (222) is located on the inner side surface of the insulating ring (220) facing the first cavity (240) and close to the bottom of the insulating ring (220).

14. The battery cover according to claim 13, characterized in that: Along the height direction of the cover body (200), the height of the insulating ring (220) is H3, and 2.0 mm ≤ H3 ≤ 4.0 mm.

15. The battery cover according to claim 14, characterized in that: The wall thickness of the insulating ring (220) is L3, and is between 4.0 mm ≤ L3 ≤ 12.0 mm.

16. A battery, characterized in that: include: A housing (100), wherein the interior of the housing (100) comprises a second cavity (110), and both ends of the housing (100) comprise openings communicating with the second cavity (110); At least one battery cover according to any one of claims 1 to 15, wherein the battery cover is connected to at least one end of the housing (100), and the first cavity (240) of the battery cover is in communication with the second cavity (110) of the housing (100); A battery cell is located in the second cavity (110), and pole tabs are provided at both ends of the battery cell, and the pole tab at at least one end is electrically connected to the cover body (210) of the battery cover.

17. The battery according to claim 16, characterized in that At least a portion of the tab is located in the first cavity (240), and one end of the tab is electrically connected to a side of the boss (214) of the cover body (210) facing the first cavity (240).

18. The battery according to claim 17, characterized in that The wall thickness of the housing (100) is X2, and is between 0.075 mm ≤ X2 ≤ 1.0 mm.

19. A battery pack, characterized in that: include: The battery according to any one of claims 16 to 18.

20. An electrical device, characterized in that: include: An electrical device, and the battery pack according to claim 19 or the battery according to any one of claims 16 to 18, wherein the battery pack or the battery is used to provide electrical energy to the electrical device.

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