Battery cover plate, battery, battery pack and electrical device

Abstract

A battery cover plate, a battery, a battery pack and an electrical device, which belong to the technical field of batteries. The battery cover plate comprises a cover plate body, an insulating ring and a connecting ring, wherein 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 support portion protruding from the second end portion toward the first end portion, wherein the second end portion of the cover plate body is connected to a top surface of the insulating ring. The connecting ring comprises a first connecting portion, a second connecting portion, and a second support portion protruding from the second connecting portion toward the first connecting portion, wherein the first connecting portion is connected to a bottom surface of the insulating ring, and the second connecting portion is configured to connect to a case of the battery. The first support portion and the second support portion improve the structural strength of the cover plate body and the connecting ring, achieve dispersion and transfer of welding stress and other stresses during subsequent use, and improve the overall deformation resistance and impact resistance of the battery.

Description

Battery cover plate, battery, battery pack and electric equipment

[0001] The present application claims priority to the Chinese patent application No. 202411377817.0, filed on September 27, 2024, and entitled "Battery cover plate, battery, battery pack and electric equipment", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of batteries, in particular to a battery cover plate, a battery, a battery pack and an electric equipment. BACKGROUND

[0003] With the continuous progress of battery technology and the growing market demand, the performance of batteries in new energy battery vehicles is increasingly concerned, and the energy density and safety of the battery have become important indicators for measuring battery performance.

[0004] However, the design of the traditional battery cover plate usually adopts a collection mode of riveting pole, aluminum block, lead-out sheet and other components, which causes low utilization rate of internal structural space of the battery and affects the volume utilization rate of the battery pack and the module. In addition, the cross-sectional area of the pole directly determines the maximum current capacity that the cover plate can bear. Due to the physical limitations in the width direction of the battery, it is difficult to further increase the size of the circular pole, which limits the current-carrying capacity of the cover plate and further limits the potential of the battery to achieve higher efficiency fast charging. SUMMARY

[0005] The purpose of the present application is to provide a battery cover plate, a battery, a battery pack and an electric equipment, which integrates the shell and the battery cover body into one body and connects the cell tabs by direct welding technology, thereby eliminating parts such as current collecting plates, and the cover plate body acts as a pole. Moreover, the cover body and the connecting ring adopt a structure design with different wall thicknesses in the form of "Z" section, which optimizes the stress condition between the cover plate, the connecting ring and the shell, enhances the stability of the structure, and realizes the absorption of stress deformation in the welding process and subsequent use process.

[0006] Embodiments of the present application provide the following technical solutions to solve the above technical problems:

[0007] Firstly, the present application provides a battery cover plate, comprising:

[0008] a cover body, the cover body having a first cavity inside, the cover body comprising a cover plate body, an insulating ring and a connecting ring, the insulating ring being located between the cover plate body and the connecting ring;

[0009] the cover plate body comprising a first end portion, a second end portion and a first support portion extending from the second end portion to the first end portion, the second end portion of the cover plate body being connected to the top surface of the insulating ring;

[0010] The connecting ring comprises a first connecting part, a second connecting part, and a second supporting part extending 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 the shell of the battery.

[0011] The battery cover plate provided by the embodiment of the application comprises a cover body, the cover body has a first cavity inside, and the cover body comprises a cover plate body, an insulating ring, and a connecting ring. The insulating ring is located between the cover plate body and the connecting ring, and the cover plate body and the connecting ring are insulated from each other. The cover plate body comprises a first end part, a second end part, and a first supporting part extending from the second end part to the first end part. The second end part of the cover plate body is connected with the top surface of the insulating ring. The connecting ring comprises a first connecting part, a second connecting part, and a second supporting part extending 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 the shell of the battery. In this way, the first end part and the second end part in the cover plate body are connected through the first supporting part, and the first connecting part and the second connecting part in the connecting ring are connected through the second supporting part. The structural strength of the cover plate body and the connecting ring is improved through the first supporting part and the second supporting part, so as to avoid damage to the cover plate body and the connecting ring caused by welding stress generated in the welding process and damage to the cover plate body and the connecting ring caused by external environmental stress in the use process. It can be understood that the cover plate body disperses and transmits stress through the first supporting part, and the connecting ring disperses and transmits stress through the second supporting part, so as to reduce local stress concentration, thereby enhancing the overall stability and reliability of the structure and improving the overall anti-deformation and stamping resistance of the battery.

[0012] In a possible implementation, the first supporting part is arranged obliquely, and the distance between the inner walls of the first supporting part gradually increases in the direction from the first end part to the second end part. In this way, the first supporting part forms a gradually changing transition zone on the cover plate body, which is beneficial to dispersing and balancing stress generated in the production and use process of the battery or various stresses accepted by the battery.

[0013] In a possible implementation, a boss is arranged on the first end part, the boss is located in the first cavity, and the boss is used for being connected with the tab of the battery. In this way, the boss can provide a stable contact surface for the tab, can ensure precise connection between the tab and the cover plate body, and is also beneficial to reducing the possibility of poor contact or looseness between the tab and the cover plate body caused by inconvenience in welding.

[0014] In a possible implementation, the boss and the cover plate body are integrally formed by stamping.

[0015] In a possible implementation, the maximum thickness of the cover plate body along the height direction of the cover body is H1, and 0.6mm≤H1≤3.0mm. In this way, the thickness range of the cover plate body can be defined, and a suitable thickness of the cover plate body can ensure sufficient mechanical strength and corrosion resistance, reduce the weight of the battery, and improve the energy density.

[0016] In a possible implementation, the maximum thickness of the boss and the first end portion along the height direction of the cover body is H2, and 0.6mm≤H2≤5.0mm. In this way, the thickness of the welding area of the boss and the battery tab can be defined, the welding quality of the tab can be ensured, and the possibility of welding leakage caused by poor welding appearance can be avoided. A suitable welding area thickness can also improve the space utilization of the internal structure of the battery, reduce the weight and cost of the structural member.

[0017] In a possible implementation, the minimum width of the second end portion of the cover plate body along the width direction of the cover body is L1, and 0.5mm≤L1≤5.0mm. In this way, the width of the second end portion of the cover plate body can be defined, sufficient contact between the cover plate body and the top surface of the insulating ring can be ensured, a tight connection can be formed, and the leakage of electrolyte or the entry of impurities from the external environment into the battery interior can be effectively prevented.

[0018] In a possible implementation, the second support portion is inclined, and the first connecting portion connected to one end of the second support portion is higher than the second connecting portion connected to the other end of the second support portion along the height direction of the cover body.

[0019] In a possible implementation, the connecting ring is further provided with a protrusion on the side facing the second connecting portion, and the protrusion is located in the shell of the battery. In this way, the connection stability between the battery shell and the connecting ring can be ensured by the protrusion, the assembly process is simplified, and the assembly precision, sealing performance, and structural durability are improved.

[0020] In a possible implementation, the minimum width of the first connecting portion along the width direction of the cover body is L2, and 0.5mm≤L2≤5.0mm. In this way, the width of the first connecting portion of the connecting ring can be defined, sufficient contact between the connecting ring and the bottom surface of the insulating ring can be ensured, a tight connection can be formed, and the leakage of electrolyte or the entry of impurities from the external environment into the battery interior can be effectively prevented.

[0021] In a possible implementation, the shortest distance between the outer side of the second connecting part and the outer side of the protrusion facing the shell side of the battery is X1, and -0.5 mm≤X1-X2≤1.8 mm, X2 being the shell thickness of the battery. In this way, by controlling the distance between the inner side wall of the battery shell and the outer side wall of the protrusion on the connecting ring, the assembly gap between the cover of the battery and the shell of the battery is ensured to meet the requirements in the subsequent use of the battery.

[0022] In a possible implementation, the insulating ring is provided with a first notch, which is located on the inner side of the insulating ring facing the first cavity and close to the top of the insulating ring.

[0023] In a possible implementation, the insulating ring is further provided with a second notch, which is located on the inner side of the insulating ring facing the first cavity and close to the bottom of the insulating ring.

[0024] In a possible implementation, along the height direction of the cover, the height of the insulating ring is H3, and 2.0 mm≤H3≤4.0 mm. In this way, by controlling the height of the insulating ring, the rational use of the internal space of the battery can be considered while the insulation performance and structural strength of the insulating ring are ensured.

[0025] In a possible implementation, the wall thickness of the insulating ring is L3, and 4.0 mm≤L3≤12.0 mm. In this way, by controlling the wall thickness of the insulating ring, the rational use of the internal space of the battery can be considered while the insulation performance and structural strength of the insulating ring are ensured.

[0026] Secondly, the application further discloses a battery, comprising:

[0027] a shell, the inside of the shell having a second cavity, and the two ends of the shell having openings communicating with the second cavity;

[0028] at least one battery cover plate described above, the battery cover plate being connected to at least one end of the shell, and the first cavity of the battery cover plate communicating with the second cavity of the shell;

[0029] a cell, the cell being located in the second cavity, and the two ends of the cell being respectively provided with a tab, and the tab of at least one end being electrically connected to the cover body of the battery cover plate.

[0030] In a possible implementation, at least part of the tab is located in the first cavity, and one end of the tab is electrically connected to a side of the boss of the cover plate body facing the first cavity. In this way, the space inside the battery can be more effectively utilized, so that the overall structure of the battery is more compact, which is conducive to reducing the volume and weight of the battery and improving the energy density. Directly electrically connecting the top end of the tab to the boss of the cover plate body can reduce the resistance and energy loss in the electrical connection path.

[0031] In a possible implementation, the wall thickness of the shell is X2, and 0.075 mm≤X2≤1.0 mm. In this way, the thickness range of the shell can be defined, and a suitable shell wall thickness can ensure to provide sufficient mechanical strength and corrosion resistance on the basis of reducing the weight of the battery and improving the energy density. It should be noted that the wall thickness of the shell can be adjusted according to the actual working condition requirements.

[0032] Thirdly, the application further discloses a battery pack, comprising:

[0033] The battery described above.

[0034] Fourthly, the application further discloses a power utilization device, comprising:

[0035] The power utilization device, and the battery pack or the battery described above, wherein the battery pack or the battery is configured to provide electric energy for the power utilization device.

[0036] In addition to the technical problems solved by the application described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features, the other technical problems solved by the battery cover plate, the battery, the battery pack, and the power utilization device provided by the application, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments or the background art of the application, the drawings needed to be used in the embodiments or the background art of the application will be described below.

[0038] FIG. 1 is a schematic diagram of a battery, a battery pack, and a power utilization device according to some embodiments of the application;

[0039] FIG. 2 is a structural schematic diagram of a battery cover plate according to some embodiments of the application;

[0040] FIG. 3 is an exploded view of a battery cover plate according to some embodiments of the application;

[0041] FIG. 4 is a partial schematic diagram of a battery cover plate according to some embodiments of the application;

[0042] FIG. 5 is a sectional view of the battery cover plate according to some embodiments of the present application;

[0043] FIG. 6 is a sectional view of the battery cover plate according to some embodiments of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS 1 - electric device; 11 - battery pack; 12 - battery; 100 - shell; 200 - cover; 110 - second cavity; 210 - cover plate body; 220 - insulation ring; 230 - connecting ring; 240 - first cavity; 211 - first end; 212 - second end; 213 - first support; 214 - boss; 221 - first notch; 222 - second notch; 231 - first connecting part; 232 - second connecting part; 233 - second support; 234 - protrusion. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0046] FIG. 1 is a schematic view of a battery, a battery pack and an electric device according to some embodiments of the present application; FIG. 2 is a structural schematic view of a battery cover plate according to some embodiments of the present application; FIG. 3 is an exploded view of the battery cover plate according to some embodiments of the present application; FIG. 4 is a partial schematic view of the battery cover plate according to some embodiments of the present application; FIG. 5 is a sectional view of the battery cover plate according to some embodiments of the present application; and FIG. 6 is a sectional view of the battery cover plate according to some embodiments of the present application.

[0047] Referring to FIG. 1, the embodiments of the present application provide an electric device, which includes an electric device and a battery pack 11 or a battery 12. The battery pack 11 or the battery 12 provides electric energy for the electric device. For example, the electric device 1 can be a vehicle or an energy storage device. When the electric device 1 is a vehicle, the vehicle can be an electric vehicle, an electric car, 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 1 is an energy storage device, the electric device can be an inverter, a controller, etc. The battery pack 11 can include a plurality of batteries 12. In a possible implementation, the battery 12 can be a cylindrical battery, or the battery 12 can be a square battery, or the battery can have a plurality of battery cells inside. The plurality of batteries 12 are connected by a certain connection mode and a control system to realize storage and output of electric energy. The battery pack 11 or the battery 12 can provide electric energy for the electric device to meet the normal operation of the device.

[0048] The embodiment of the present application provides a battery, as shown in FIG. 2 and FIG. 5, which comprises a shell 100, at least one battery cover plate and a battery cell (not shown in the figure). The shell 100 has a second cavity 110 inside, and the shell 100 has openings at both ends which are in communication with the second cavity 110. The battery cover plate is connected to at least one end of the shell 100, and the first cavity 240 of the battery cover plate is in communication with the second cavity 110 of the shell 100. The battery cell is located in the second cavity 110, and the battery cell has a tab at each end, and the tab at at least one end is electrically connected to the cover plate body 210 of the battery cover plate.

[0049] It can be understood that the shell 100 has a second cavity 110 inside, which can wrap and fix the battery cell, the tab and other components, so as to prevent the battery cell and the tab from being mechanically damaged by external vibration, impact and the like. The shell 100 has openings at both ends which are in communication with the second cavity 110, and the tab can be led out through the openings and electrically connected to the battery cover plate.

[0050] In a possible implementation, only one end of the shell 100 is connected to the battery cover plate of the embodiment, and the other end of the shell 100 is not limited. In another possible implementation, both ends of the shell 100 are connected to the battery cover plate of the embodiment. The battery cover plate has a first cavity 240 inside, and the first cavity 240 is in communication with the second cavity 110 through the openings of the shell 100, and the first cavity 240 and the second cavity 110 together accommodate the tab and other components of the battery 12. Through the close cooperation of the battery cover plate and the shell 100, the battery cell and the tab can also work in a sealed environment, effectively preventing the leakage of electrolyte or the invasion of external gas and liquid, so as to ensure the integrity and stability of the internal structure of the battery.

[0051] In some embodiments of the present application, at least part of the tab is located in the first cavity 240, and one end of the tab is electrically connected to the side of the boss 214 of the cover plate body 210 which faces the first cavity 240. It can be understood that placing at least part of the tab in the first cavity 240 of the top cover can more effectively utilize the space inside the battery, so that the overall structure of the battery 12 is more compact, which is beneficial to reduce the volume and weight of the battery 12 and improve the energy density. Electrically connecting the top end of the tab to the boss 214 of the cover plate body 210 can reduce the resistance and energy loss in the electric connection path.

[0052] In some embodiments of the present application, as shown in FIGS. 5 and 6, the wall thickness of the shell 100 is X2, and 0.075 mm≤X2≤1.0 mm. For example, X2 can be 0.075 mm, 0.1 mm, 0.5 mm, or 1.0 mm. In this way, the thickness range of the shell 100 can be defined, and a suitable wall thickness of the shell 100 can ensure that sufficient mechanical strength and corrosion resistance are provided on the basis of reducing the weight of the battery and improving the energy density. It should be noted that the wall thickness of the shell 100 can be adjusted according to the actual working condition requirements.

[0053] It should be noted that the shell 100 can be formed by stamping or bending and welding, and the preferred material can be aluminum or steel, but is not limited to the above-mentioned materials, for example, composite steel-aluminum materials or metal conductive materials that do not react with the electrolyte inside the battery can also be used.

[0054] The present application provides a battery cover plate, as shown in FIGS. 2 to 5, which includes a cover body 200, the cover body 200 has a first cavity 240 inside, the cover body 200 includes a cover plate body 210, an insulating ring 220, and a connecting ring 230, the insulating ring 220 is located between the cover plate body 210 and the connecting ring 230. The cover plate body 210 includes a first end portion 211, a second end portion 212, and a first support portion 213 extending from the second end portion 212 to the first end portion 211, the second end portion 212 of the cover plate body 210 is connected to the top surface of the insulating ring 220. The connecting ring 230 includes a first connecting portion 231, a second connecting portion 232, and a second support 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 shell 100 of the battery 12.

[0055] In this way, the integrated design of the cover plate body 210, the insulating ring 220, and the connecting ring 230 is adopted instead of the conventional multi-component cover plate structure of the battery shell, which reduces the cooperation and assembly steps between components, thereby improving the assembly efficiency. The cover plate body 210 and the connecting ring 230 are designed to have a "Z-shaped" structure in cross section, and the connection requirements are met by the design of the wall thickness of different regions. It can be understood that the "Z-shaped" structure mentioned in the present application can be, for example, the second end portion 212, the first support portion 213, and the first end portion 211 connected to form a structure similar to the Z-shaped structure on the left side in FIG. 5, and it is not completely Z-shaped, nor is it the structure presented when the cover plate body 210 is cut in FIG. 5.

[0056] Specifically, the second end 212 of the cover plate body 210 extends to the first end 211 through the first support 213 arranged obliquely, and the first end 211 is higher than the second end 212 in the height direction of the cover body 200. The second connecting portion 232 of the connecting ring 230 extends to the first connecting portion 231 through the second support 233 arranged obliquely, and the first connecting portion 231 is higher than the second connecting portion 232 in the height direction of the cover body 200. That is, the turning points of the "Z-shaped" structure of the cover plate body 210 are the connecting points of the first support 213 and the first end 211, the connecting points of the first support 213 and the second end 212, and the turning points of the "Z-shaped" structure of the connecting ring 230 are the connecting points of the second support 233 and the first connecting portion 231, and the connecting points of the second support 233 and the first connecting portion 231.

[0057] The cover plate body 210 has a first end 211 and a second end 212, wherein the first end 211 is used to connect with the tab of the battery 12 as the input and output point of current. The second end 212 is located at the other end opposite to the first end 211, and the second end 212 is closely connected with the top surface of the insulating ring 220 to form a seal. The first end 211 and the second end 212 are further provided with a first support 213, which can provide additional support strength and is conducive to enhancing the overall stability of the cover plate body 210. When external force is extruded or collided during use of the battery 12, the first support 213 can serve as a buffer to absorb part of the impact energy, thereby providing reliable protection and stable performance support for the battery.

[0058] The connecting ring 230 has a first connecting portion 231 and a second connecting portion 232, wherein the first connecting portion 231 is used to be closely connected with the bottom surface of the insulating ring 220 to form a seal, and the second connecting portion 232 is used to be closely connected with the shell 100 of the battery 12 to form a seal, which effectively prevents the infiltration of gas, liquid or impurities in the external environment. The first connecting portion 231 and the second connecting portion 232 are further provided with a second support 233, which can provide additional support strength for the connecting ring 230, thereby helping to enhance the overall stability of the connecting ring 230 and being conducive to dispersing and absorbing the thermal stress generated during welding, thereby avoiding the failure problem between the connecting ring 230 and the insulating ring 220 caused by thermal influence.

[0059] It should be noted that in another possible implementation, the first connecting part 231 is directly connected with the second connecting part 232, the first connecting part 231 is used to absorb the thermal stress generated in the welding process of the connecting ring 230 and the insulating ring 220, and the second connecting part 232 is used to absorb the thermal stress generated in the welding process of the connecting ring 230 and the shell 100, so as to avoid the deformation of the battery 12 caused by welding problems. The section of the cover plate body 210 and the connecting ring 230 can adopt a "Z-shaped" structure, but is not limited to the above structure, and any structure scheme that can absorb stress deformation can be adopted.

[0060] The insulating ring 220 is located between the cover plate body 210 and the connecting ring 230, and can play a role of isolation and insulation to prevent safety hazards such as short circuit or electric leakage inside the battery. At the same time, the insulating ring 220 has sufficient mechanical strength and can also withstand the vibration and impact that the battery can generate in the working process. It should be noted that the insulating ring 220 can be preferably made of ceramic material, but is not limited to ceramic material, for example, other insulating materials such as PPS injection material and glass material can also be adopted. Moreover, the top end of the insulating ring 220 is connected with the second end part 212 of the cover plate body 210, and the bottom of the insulating ring 220 is connected with the top surface of the connecting ring 230, and the first cavity 240 is formed by the cover plate body 210, the insulating ring 220 and the connecting ring 230, so that part of the tab is electrically connected with the boss 214 of the cover plate body 210 in the first cavity 240. On the basis of ensuring the reliability and safety of the battery, it is beneficial to compress the space volume inside the battery, so that the inside of the battery is more integrated and compact.

[0061] It should be noted that the cover plate body 210 and the connecting ring 230 can be made of metal material, for example, can be made of aluminum material or copper material or other arbitrary material, which meets the design requirement, and the present application is not limited here.

[0062] In some embodiments of the present application, as shown in FIG. 5, the first support part 213 is inclined, for example, in FIG. 5, the first support part 213 is inclined towards the first end part 211. Wherein, and along the direction from the first end part 211 to the second end part 212, the inner diameter of the first support part 213 gradually increases. In this way, the first support part 213 forms a gradual transition zone on the cover plate body 210, which is beneficial to disperse and balance the stress generated in the production and use process of the battery or various stresses accepted. For example, when the battery is subjected to external force, such as vibration, impact or expansion and contraction caused by temperature change, the first support part 213 arranged in an inclined manner can more effectively absorb and disperse these forces, thereby enhancing the stability of the entire battery cover plate.

[0063] It can be understood that when the first support part 213 adopts a straight wall design, stress concentration may occur at the corner, and the inclined design of the first support part 213 helps to disperse these stresses, reduces the possibility of material fatigue and failure caused by stress concentration, and is of great significance to improve the reliability and service life of the battery 12.

[0064] In some embodiments of the present application, referring to FIG. 5, the first end 211 is provided with a boss 214 located in the first cavity 240. The boss 214 is integrally stamped and formed with the cover body 210, and the boss 214 is used to connect with the tab of the battery 12. In this way, the boss 214 can provide a stable contact surface for the tab, and can ensure accurate linking between the tab and the cover body 210, and is also helpful to reduce the possibility of poor contact or loosening between the tab and the cover body 210 due to inconvenience in welding.

[0065] It can be understood that the boss 214 is used to connect with the tab of the battery 12 and establish electrical connection with the external circuit. The tab is tightly fixed through the bottom surface of the boss 214, which can ensure that the battery can stably output electric energy to the outside to meet the working requirements of the equipment. The boss 214 is arranged on the side of the first end 211 of the cover body 210 facing the first cavity 240, and is integrally stamped and formed, which enhances the connection strength between the boss 214 and the cover body 210, and makes the whole structure more solid and durable.

[0066] In some embodiments of the present application, as shown in FIGS. 5 and 6, 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, and appropriate thickness of the cover body 210 can ensure to provide sufficient mechanical strength and corrosion resistance on the basis of reducing the weight of the battery and improving the energy density. It should be noted that the thickness of the cover body 210 can be adjusted according to the actual working condition requirements. In one possible implementation, the cover body 210 can be directly stamped from a metal plate, and at this time 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, and at this time the maximum thickness H1 of the cover body 210 is the maximum thickness of the metal plate.

[0067] It can be understood that when the thickness of the cover plate body 210 is thin, for example, less than 0.6 mm, the structural strength of the cover plate body 210 can not be able to withstand the mechanical stress or impact on the battery during normal use, which can cause the cover plate body 210 to deform, break or even fail, thereby affecting the overall safety and reliability of the battery 12. When the thickness of the cover plate body 210 is thick, for example, greater than 3.0 mm, the cover plate body 210 can provide sufficient structural strength, but also increases the overall weight and cost of the battery 12, and increases the welding difficulty when the ceramic brazing is performed with the insulating ring 220, and the thick cover plate body 210 can also affect the heat dissipation performance of the battery during subsequent use.

[0068] In some embodiments of the present application, as shown in FIGS. 5 and 6, the maximum thickness of the boss 214 and the first end portion 211 is H2, and 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. In this way, the thickness of the welding area of the boss 214 and the battery tab can be limited to ensure the welding quality of the tab and avoid the possibility of welding leakage caused by poor welding appearance. The appropriate welding area thickness can also improve the space utilization of the internal structure of the battery, reduce the weight and cost of the structural parts.

[0069] It should be noted that the maximum thickness of the boss 214 and the first end portion 211 is the thickness of the welding area of the tab. That is, the maximum thickness of the boss 214 and the first end portion 211 is the maximum distance from the side of the boss 214 facing the accommodating cavity to the side of the first end portion 211 away from the accommodating cavity. When the welding area thickness is thin, for example, less than 0.6 mm, the subsequent thickness of the welding area is less than the thickness of the cover plate body 210, and the formation of the recess of the first end portion 211 can cause the tab to be not firmly welded. Even the possibility of electrolyte leakage caused by welding through. When the thickness of the welding area is thick, for example, greater than 5.0 mm, the thick welding area not only increases the weight and cost of the structure, but also cannot maximize the utilization in the limited battery space, causing waste of internal space of the battery.

[0070] When the material of the boss 214 and the cover plate body 210 is copper or steel, the preferred range of the thickness H2 of the boss 214 and the first end portion 211 can be between 0.6-2.5 mm, including 0.6 mm and 2.5 mm. When the material of the boss 214 and the cover plate body 210 is aluminum, the preferred range of the thickness H2 of the boss 214 and the first end portion 211 can be between 1.5-3.8 mm, including 1.5 mm and 3.8 mm.

[0071] In some embodiments of the present application, as shown in FIGS. 5 and 6, along the width direction of the cover body 200, the second end portion 212 of the cover plate body 210 has a minimum width L1, and 0.5 mm≤L1≤5.0 mm. For example, L1 can be 0.5 mm, 2.5 mm, 4.0 mm, or 5.0 mm. That is, the minimum distance between the outer side surface and the inner side surface of the second end portion 212 is L1. In this way, the width of the second end portion 212 of the cover plate body 210 can be limited, and sufficient contact between the cover plate body 210 and the top surface of the insulating ring 220 can be ensured, so as to form a tight connection and effectively prevent the electrolyte from leaking or impurities from the external environment from entering the battery.

[0072] It can be 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 plate body 210 and the insulating ring 220 can be affected. When the width L1 of the second end portion 212 is large, such as greater than 5.0 mm, the material consumption and welding difficulty can be increased.

[0073] The second end portion 212 of the cover plate body 210 covers the opening of the insulating ring 220, and the inner side edge of the second end portion 212 also covers the opening of the insulating ring 220, so that the second end bottom surface of the cover plate body 210 can be in sufficient contact with the top surface of the insulating ring 220 to form a tight connection. By limiting the width L1 of the second end portion 212, sufficient contact area between the cover plate body 210 and the top surface of the insulating ring 220 can be ensured, so as to achieve a tighter connection. A sufficiently tight connection can also ensure that the battery cover plate can withstand certain mechanical stress and pressure, so that the cover plate body 210 has sufficient structural strength and can resist external impact and internal pressure changes.

[0074] In some embodiments of the present application, as shown in FIGS. 4 and 5, the connecting ring 230 is further provided with a protrusion 234 located on one side facing the second connecting portion 232 and located in the shell 100 of the battery 12. In this way, the connecting stability between the battery shell 100 and the connecting ring 230 can be ensured by the protrusion 234, which not only simplifies the assembly process, but also improves the assembly precision, sealing performance, and structural durability.

[0075] It can be understood that the protrusion 234 on the connecting ring 230 can serve as a support point of the battery shell 100, so that the top end opening of the shell 100 is stably fixed on the protrusion 234 of the connecting ring 230, which is not only conducive to the positioning and identification during the subsequent welding between the shell 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 shell 100, and the outer side surface of the protrusion 234 and the inner side surface of the shell 100 are in abutment to achieve double connection, which can also effectively disperse the deformation of the connecting part between the battery shell 100 and the connecting ring 230 caused by external force collision during the subsequent use of the battery, reduce the possibility of loosening or damage, and ensure the stable operation of the battery 12.

[0076] Further welding the connecting ring 230 and the shell 100 can also ensure the sealing of the battery 12. The close fit between the shell 100 and the protrusion 234 can further effectively prevent harmful substances such as moisture and dust in the external environment from entering the battery, and also prevent the leakage of substances such as electrolyte in the battery to the external environment, thereby prolonging the service life of the battery 12.

[0077] In some embodiments of the present application, as shown in FIGS. 5 and 6, the minimum width of the first connecting part 231 along the width direction of the cover 200 is L2, and 0.5mm≤L2≤5.0mm. For example, L2 can be 0.5mm, 2.5mm, 4.0mm or 5.0mm. That is, the minimum distance between the outer side surface and the inner side surface of the first connecting part 231 is L2. In this way, the width of the first connecting part 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, form a tight connection, and effectively prevent electrolyte leakage or impurities from the external environment from entering the battery. It can be understood that the width L2 of the first connecting part 231 is controlled in the same range as the width L1 of the second end part 212 of the cover body 210, and the function thereof will not be described again.

[0078] In some embodiments of the present application, as shown in FIGS. 5 and 6, the shortest distance between the outer side surface of the second connecting part 232 and the side surface of the shell 100 of the protrusion 234 facing the battery 12 is X1, and -0.5mm≤X1-X2≤1.8mm, X2 being the thickness of the shell 100 of the battery 12. In this way, by controlling the distance between the inner side wall of the battery shell 100 and the outer side wall of the protrusion 234 on the connecting ring 230, the assembly gap between the cover 200 of the battery 12 and the shell 100 of the battery 12 can be ensured to meet the needs during the subsequent use of the battery.

[0079] It should be noted that when X1-X2> 0 mm, for example, it can be 0.5 mm, 1 mm or 1.8 mm, there is a certain gap between the inner side wall of the shell 100 and the outer side wall of the protrusion 234 of the connecting ring 230, which can meet the installation requirements of the connecting ring 230 and the shell 100 in certain cases. The gap can provide enough space to accommodate minor changes caused by thermal expansion, mechanical vibration or other external environmental factors, thereby avoiding stress concentration or damage caused by tight contact. And provide additional buffer space, which helps to reduce damage to the connecting ring 230 and the shell 100 caused by external impact or vibration.

[0080] When X1-X2= 0 mm, the inner side wall of the shell 100 is in contact with the outer side 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, reduce unnecessary space waste, and at the same time, improve the overall strength of the battery 12 to some extent. Prevent external environmental factors such as moisture or dust from entering the battery interior through the gap and causing damage to the battery.

[0081] When X1-X2< 0 mm, for example, it can be -0.1 mm, -0.3 mm or -0.5 mm, the inner side wall of the shell 100 and the outer side wall of the protrusion 234 of the connecting ring 230 form an interference fit, which ensures that the protrusion 234 on the connecting ring 230 is in close contact with the inner side wall of the shell 100 to form interference, thereby improving the integration and sealing performance of the internal space of the battery. And it is also beneficial to enhance the connection strength between the connecting ring 230 and the shell 100, and improve the overall structural stability of the battery 12.

[0082] In some embodiments of the present application, as shown in FIGS. 4 and 5, 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.

[0083] In the embodiments of the present application, the cover plate body 210 and the top surface of 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 a filler metal to melt and wet the surfaces of ceramics and metals at high temperatures, and forms a firm connection after cooling and solidification. The use of ceramic brazing for connection can ensure the close combination between the cover plate body 210 and the insulating ring 220, and between the connecting ring 230 and the insulating ring 220, preventing electrolyte leakage or external gas from entering the battery interior. The first gap 221 and the second gap 222 can be used to store the filler metal, preventing the filler metal from flowing down along the inner wall of the insulating ring 220 during the heating process, thereby improving the connection quality of the ceramic brazing and the overall performance of the battery 12.

[0084] In some embodiments of the present application, as shown in FIGS. 5 and 6, 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. For example, H3 can be 2.0 mm, 2.5 mm, 3.5 mm, or 4.0 mm. The wall thickness of the insulating ring 220 is L3, and 4.0 mm≤L3≤12.0 mm. For example, L3 can be 4.0 mm, 5.5 mm, 9.5 mm, or 12.0 mm. 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 reasonably utilizing the internal space of the battery.

[0085] It can be understood that a proper height of the insulating ring 220 can ensure sufficient insulation distance, effectively preventing the tabs of the battery 12 from making unnecessary contact with the shell 100 and the connecting ring 230, causing internal short circuit of the battery. After the tabs of the battery cell are led out and connected to the boss 214 of the cover plate body 210, in addition to the insulation protection of the insulating ring 220, the leading-out position of the battery cell and the tab can be wrapped with an insulating film or insulating tape to prevent contact between the battery cell and the tab and the shell 100 and the connecting ring 230, causing internal short circuit of the battery. A proper wall thickness of the insulating ring 220 can ensure insulation effect and also have sufficient mechanical strength, so that the insulating ring 220 can withstand various mechanical forces from the inside and outside of the battery, such as pressure and vibration during assembly, thereby improving the anti-deformation and impact resistance of the insulating ring 220.

[0086] Wherein, the terms such as "upper", "lower", etc. are used to describe the relative positional relationship of various structures in the drawings, which is only for the convenience of clear description, and does not limit the scope of the present application. Changes or adjustments of the relative relationship without substantial changes in technical content are also considered as the scope of the present application.

[0087] It should be noted that in the present application, unless specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0088] In addition, in the present application, unless specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0089] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" 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 the present specification, the exemplary description of the above terms does not necessarily refer 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.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover plate, comprising: a cover body (200) having a first cavity (240) inside, the cover body (200) comprising a cover plate body (210), an insulation ring (220) and a connecting ring (230), the insulation ring (220) being located between the cover plate body (210) and the connecting ring (230) ; the cover plate body (210) comprising a first end (211), a second end (212), and a first support portion (213) extending from the second end (212) to the first end (211), the second end (212) of the cover plate body (210) being connected to a top surface of the insulation ring (220) ; the connecting ring (230) comprising a first connecting portion (231), a second connecting portion (232), and a second support portion (233) extending from the second connecting portion (232) to the first connecting portion (231), the first connecting portion (231) being connected to a bottom surface of the insulation ring (220), and the second connecting portion (232) being configured to be connected to a shell (100) of a battery. 2.The battery cover plate of claim 1, wherein the first support portion (213) is inclined, and a distance between inner walls of the first support portion (213) gradually increases in a direction from the first end (211) to the second end (212). 3.The battery cover plate of claim 1, wherein a boss (214) is provided on the first end (211), the boss (214) being located in the first cavity (240), and the boss (214) being configured to be connected to a tab of the battery. 4.The battery cover plate of claim 3, wherein the boss (214) is integrally formed with the cover plate body (210) by stamping. 5.The battery cover plate of any one of claims 1-4, wherein a maximum thickness of the cover plate body (210) in a height direction of the cover body (200) is H1, and 0.6mm≤H1≤3.0mm. 6.The battery cover plate of claim 3, wherein a maximum thickness of the boss (214) and the first end (211) in the height direction of the cover body (200) is H2, and 0.6mm≤H2≤5.0mm. 7.The battery cover plate of any one of claims 1-6, wherein a minimum width of the second end (212) of the cover plate body (210) in a width direction of the cover body (200) is L1, and 0.5mm≤L1≤5.0mm. 8.The battery cover plate of any one of claims 1-7, wherein the second support portion (233) is inclined, and the first connecting portion (231) connected to one end of the second support portion (233) is higher than the second connecting portion (232) connected to the other end of the second support portion (233) in the height direction of the cover body (200).

9. The battery cover plate of any one of claims 1-8, wherein the connecting ring (230) further comprises a protrusion (234) on one side of the second connecting portion (232), and the protrusion (234) is located inside the shell (100) of the battery.

10. The battery cover plate of any one of claims 1-9, wherein the minimum width of the first connecting portion (231) along the width direction of the cover body (200) is L2, and 0.5 mm≤L2≤5.0 mm.

11. The battery cover plate of claim 9, wherein the shortest distance between the outer side of the second connecting portion (232) and the protrusion (234) towards the side of the shell (100) of the battery is X1, and -0.5 mm≤X1-X2≤1.8 mm, X2 being the thickness of the shell (100) of the battery.

12. The battery cover plate of claim 1, wherein the insulating ring (220) comprises a first notch (221) on the inner side of the insulating ring (220) towards the first cavity (240) and close to the top of the insulating ring (220).

13. The battery cover plate of claim 12, wherein the insulating ring (220) further comprises a second notch (222) on the inner side of the insulating ring (220) towards the first cavity (240) and close to the bottom of the insulating ring (220).

14. The battery cover plate of claim 13, wherein the height of the insulating ring (220) along the height direction of the cover body (200) is H3, and 2.0 mm≤H3≤4.0 mm.

15. The battery cover plate of claim 14, wherein the wall thickness of the insulating ring (220) is L3, and 4.0 mm≤L3≤12.0 mm.

16. A battery, comprising: a shell (100) having a second cavity (110) inside, and openings at both ends of the shell (100) communicating with the second cavity (110); at least one battery cover plate of any one of claims 1-15 connected to at least one end of the shell (100), and the first cavity (240) of the battery cover plate communicating with the second cavity (110) of the shell (100); a cell located in the second cavity (110), and the cell having tabs at both ends, at least one of the tabs being electrically connected to the cover body (210) of the battery cover plate.

17. The battery of claim 16, wherein at least part of the tab is located in 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) towards the first cavity (240).

18. The battery of claim 17, wherein the wall thickness of the shell (100) is X2, and 0.075 mm≤X2≤1.0 mm.

19. A battery pack, comprising: The battery (12) according to any one of claims 16 to 18.

20. An electrical device comprising: an electrical device, and the battery pack (11) according to claim 19 or the battery (12) according to any one of claims 16 to 18, the battery pack (11) or the battery (12) being configured to provide electrical energy to the electrical device.

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