Battery cover, battery, battery pack, and electric device

Abstract

The present application discloses a battery cover, a battery, a battery pack, and an electric device. The battery cover comprises a cover body, the cover body comprises a metal cover plate and an insulating ring, the metal cover plate is connected to one end of the insulating ring, and the other end of the insulating ring is used for being connected to a case of a battery. In the extension direction of a battery cell of the battery, the insulating ring is provided with a first protrusion, and the first protrusion is used for insulating a tab from the case. The first protrusion on the insulating ring effectively provides an insulating barrier to prevent a potential short circuit between the tab and the case, further enhancing the safety performance of the battery.

Description

Battery cover, battery, battery pack and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202422133405.4, filed on August 30, 2024, entitled “Battery Cover, Battery, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cover, a battery, a battery pack, and an electrical device. Background Technology

[0003] With the continuous advancement of battery technology and the increasing market demand, the performance of batteries in new energy battery vehicles is receiving more and more attention, and battery energy density and safety have become important indicators for measuring battery performance.

[0004] The existing battery cell insulation structure has a large number of components, which makes the assembly process complicated and the riveting difficult. Furthermore, the riveted components may not meet the strength requirements. In addition, the riveting process can easily damage the PPS material on the battery casing and may cause high-voltage breakdown, thus reducing the overall safety and durability of the battery. Summary of the Invention

[0005] The purpose of this application is to provide a battery cover, battery, battery pack and electrical device. By integrating the outer shell and battery cover into one piece and using direct welding technology to connect the cell tabs, the current collector is eliminated. At the same time, the inner convex insulating ring is used to closely cooperate with the cell insulating film, which effectively achieves all-round insulation protection. This simplifies the structure, reduces the possibility of thermal runaway, and improves the safety and overall performance of the battery.

[0006] In a first aspect, this application discloses a battery cover, comprising:

[0007] The cover body includes a metal cover plate and an insulating ring, wherein the metal cover plate is connected to one end of the insulating ring and the other end of the insulating ring is connected to the outer casing of the battery;

[0008] The metal cover plate is used for electrical connection with the battery's tabs;

[0009] The first protrusion is connected to the insulating ring and is located at the end of the insulating ring facing away from the metal cover plate. The first protrusion has an annular structure and its thickness gradually decreases along the thickness of the metal cover plate and away from the metal cover plate. The first protrusion is used to insulate the tab from the outer shell.

[0010] In some embodiments, the annular structure of the first protrusion is conical, having a first end and a second end. The first end faces the metal cover and is connected to the insulating ring, while the second end faces the top of the battery cell and is larger than the first end. This gradual tapering of the first protrusion towards the cavity side of the outer casing ensures sufficient insulation without compromising the overall structure and performance of the battery cover.

[0011] In some embodiments, the inclination angle of the conical surface of the first protrusion is α, and α is between 0.5° and 70°. This limits the conical surface of the first protrusion to a certain range, which avoids unnecessary contact or friction between the metal cover and the battery cell's tabs during assembly due to limited assembly space, thus preventing potential damage to the tabs. It also avoids the reduced contact area, which could lead to greater resistance to current flow, increasing connection impedance and causing the battery to generate more heat during charging and discharging, reducing battery efficiency, and potentially accelerating battery aging.

[0012] In some embodiments, the height of the first protrusion in the thickness direction of the metal cover is H, and H is between 0.3 and 4 mm. Limiting the height of the first protrusion within a certain range avoids the need to increase the height of the cell insulation film to meet interference fit requirements in order to ensure insulation between the tab and the metal casing, which could potentially increase the risk of burning the insulation film during welding of the metal cover to the tab. It also avoids the first protrusion being too high, causing the insulation ring to be insufficiently strong to withstand the stress and vibration that the battery may encounter during use, and failing to provide sufficient support, leading to decreased insulation performance or failure.

[0013] In some embodiments, the metal cover plate has a groove on the side facing the inner cavity of the housing, and the groove is located on the outer edge of the metal cover plate. The top surface of the insulating ring is connected to the bottom surface of the groove; the inner surface of the insulating ring abuts against the groove. Thus, the groove provides a positioning and fixing function for the insulating ring, allowing it to be precisely placed within the groove during assembly and welding, ensuring the accuracy of the relative position of the top of the insulating ring and the metal cover plate.

[0014] In some embodiments, the cover further includes a connecting ring, the metal cover plate being connected to the connecting ring via the insulating ring, and the connecting ring being used to connect to the outer casing, the insulating ring being connected to the outer casing via the connecting ring. Thus, the connecting ring, acting as a connector between the metal cover plate and the insulating ring, can form a sealing barrier and enhance the structural strength, ensuring that heat generated during welding can be transferred and dissipated through the connecting ring, preventing excessively high temperatures during brazing from damaging the insulating ring and the metal cover plate.

[0015] In some embodiments, the connecting ring is sleeved on the first protrusion of the insulating ring, and the top surface of the connecting ring is connected to the bottom surface of the insulating ring. This simplifies the assembly process, allows the first protrusion to ensure precise positioning between the connecting ring and the insulating ring, ensures the connecting ring is placed in the correct position, and guarantees stable contact between the connecting ring and the insulating ring.

[0016] In some embodiments, along the length of the outer casing, a second protrusion is provided on the bottom surface of the connecting ring, and the side of the second protrusion facing the inner cavity of the outer casing is connected to the side of the first protrusion facing away from the inner cavity of the outer casing; the side of the second protrusion facing away from the inner cavity of the outer casing is connected to a portion of the inner sidewall of the outer casing; the connecting ring is made of metal. Thus, the second protrusion, positioned along the longitudinal extension direction of the outer casing, enhances the connection strength between the connecting ring and the outer casing, improving the stability and durability of the entire structure. Furthermore, during the welding process, the second protrusion on the connecting ring also ensures that the insulating ring is not damaged during brazing, preventing insulation failure between the battery cell's tabs and the outer casing.

[0017] Secondly, this application discloses a battery, comprising:

[0018] The outer casing has an internal cavity, and both ends of the outer casing have openings that communicate with the cavity;

[0019] A first battery cover and a second battery cover are respectively located at the two end openings of the housing. One of the first battery cover and the second battery cover is a battery cover without a connecting ring, and the other is a battery cover with a connecting ring.

[0020] Alternatively, both the first battery cover and the second battery cover may be battery covers with connecting rings;

[0021] The battery cell is located inside the cavity, and each end of the battery cell is provided with a tab, which is electrically connected to the metal cover plates of the first battery cover and the second battery cover, respectively.

[0022] In some embodiments, the first battery cover may be the battery cover without the connecting ring described above, and the insulating ring of the first battery cover is connected to one end of the outer casing; the second battery cover may be the battery cover with the connecting ring described above, and the connecting ring of the second battery cover is connected to the other end of the outer casing.

[0023] In some embodiments, an insulating film is also included, disposed on the outside of the battery cell, with both ends extending to the tabs. The battery cell and the outer casing are insulated from each other by the insulating film and the insulating ring. Thus, the insulating film directly wraps around the outside of the battery cell, forming an electrical isolation layer that effectively prevents direct electrical contact between the battery cell and the metal casing, preventing potential fires, explosions, or other hazards caused by electrical short circuits. Furthermore, it prevents direct contact between the battery cell and corrosive substances in the external environment, extending the battery cell's lifespan.

[0024] In some embodiments, the first protrusion of the insulating ring overlaps with the end of the insulating film, and the overlap amount is L, where L is between 0.1 and 4.5 mm; the first protrusion serves to insulate the tab from the outer casing. This ensures tight contact between the insulating ring and the insulating film, jointly enhancing the insulation effect between the tab and the outer casing. Furthermore, it makes the insulating film and insulating ring more stable inside the battery, helping to reduce loosening or displacement caused by vibration or impact, thereby improving the overall structural stability of the battery.

[0025] In some embodiments, the distance between the outer surface of the first protrusion and the inner surface of the housing is d, and d is between -0.5 and 2.0 mm.

[0026] In some embodiments, the tabs include a positive tab and a negative tab; the first battery cover is a positive cover, the second battery cover is a negative cover, the positive tab is connected to the positive metal cover plate of the positive cover, and the negative tab is connected to the negative metal cover plate of the negative cover. In this way, the current in the battery cell can flow smoothly in or out through the tabs.

[0027] In some embodiments, the positive electrode metal cover plate has a first opening and a second opening, both of which communicate with the cavity. An explosion-proof valve is provided on the first opening; a sealing cap is provided on the second opening, through which electrolyte is injected into the cavity. In this way, the explosion-proof valve can release internal pressure to prevent the battery from exploding or rupturing, effectively reducing the possibility of the battery exploding under extreme conditions. The sealing cap on the second opening seals the second opening, allowing electrolyte to be injected into the cavity of the outer casing. The electrolyte reacts chemically with the battery cells within the cavity, thereby generating electrical energy.

[0028] Thirdly, embodiments of this application also provide a battery pack, including the battery described above.

[0029] Fourthly, embodiments of this application also provide an electrical appliance, including...

[0030] The electrical device, and the aforementioned battery pack or battery, wherein the battery pack or battery is used to provide electrical energy to the electrical device.

[0031] The battery cover of this application includes a cover body, which comprises a metal cover plate and an insulating ring. One end of the metal cover plate is connected to the insulating ring, and the other end of the insulating ring is connected to the battery casing. The metal cover plate is used for electrical connection with the battery terminals. Along the extension direction of the battery cell, the insulating ring has a first protrusion for insulating the terminals from the casing. It is understood that the metal cover plate directly connects to the battery terminals to achieve electrical conduction, and the insulating ring insulates and isolates the metal cover plate from the battery casing, ensuring electrical isolation. The first protrusion on the insulating ring effectively provides an insulating barrier against the potential short circuit between the terminals and the casing, further enhancing the battery's safety performance. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the structure of a battery cover and a housing provided in an embodiment of this application;

[0033] Figure 2 is an exploded view of a battery cover and casing provided in one embodiment of this application;

[0034] Figure 3 is an exploded view of a battery cover provided in one embodiment of this application;

[0035] Figure 4 is a cross-sectional view of a battery provided in one embodiment of this application;

[0036] Figure 5 is a partial enlarged view of the first battery cover provided in an embodiment of this application;

[0037] Figure 6 is a dimensional diagram of a first battery cover provided in an embodiment of this application;

[0038] Figure 7 is a partially enlarged view of the second battery cover provided in an embodiment of this application;

[0039] Figure 8 is a dimensional diagram of a second battery cover provided for one embodiment of this application.

[0040] Reference numerals: 100-Outer casing; 200-Cover; 300-Battery cell; 400-Insulating film; 500-Taper; 201-First battery cover; 202-Second battery cover; 210-Metal cover plate; 220-Insulating ring; 230-Connecting ring; 240-Sealing cover; 211-Groove; 212-First opening; 213-Second opening; 221-First protrusion; 231-Second protrusion. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] Figure 1 is a structural schematic diagram of the battery cover and outer shell provided in an embodiment of this application; Figure 2 is an exploded view of the battery cover and outer shell provided in an embodiment of this application; Figure 3 is an exploded view of the battery cover provided in an embodiment of this application; Figure 4 is a cross-sectional view of the battery provided in an embodiment of this application; Figure 5 is a partially enlarged view of the first battery cover provided in an embodiment of this application; Figure 6 is a dimensional diagram of the first battery cover provided in an embodiment of this application; Figure 7 is a partially enlarged view of the second battery cover provided in an embodiment of this application; and Figure 8 is a dimensional diagram of the second battery cover provided in an embodiment of this application.

[0043] This application provides an electrical device, which includes an electrical component and a battery pack or battery that provides electrical energy to the electrical component. For example, the electrical device can be a vehicle or an energy storage device. When the electrical device is a vehicle, the vehicle can be an electric vehicle, a gasoline vehicle, or a hybrid vehicle. The electrical component can be an electric motor, a control system, a lighting system, etc. When the electrical device is an energy storage device, the electrical component can be an inverter, a controller, etc. The battery pack can include multiple batteries, and these batteries are connected in a certain way and controlled by a control system to store and output electrical energy. The electrical energy provided by the battery pack or battery can meet the normal operation requirements of the device.

[0044] This application provides a battery, which can be a cylindrical battery, a long and narrow prismatic battery, or other battery shapes, without limitation. Referring to Figure 4, it includes a casing 100, a battery cover, and a battery cell 300. The casing 100 has an internal cavity, and both ends of the casing 100 have openings communicating with the cavity. The battery cover is connected to both ends of the casing 100 to seal the battery cell 300 inside the cavity. The battery cell 300 is located inside the cavity, and both ends of the battery cell 300 are respectively provided with tabs 500, which are electrically connected to the battery covers at both ends of the casing 100.

[0045] Understandably, the casing encloses and secures the battery cell 300 and the tab 500 to prevent mechanical damage caused by external vibrations or impacts. The battery cover is used to seal the battery cell 300 and the tab 500 inside the cavity of the casing 100. Through the tight fit between the battery cover and the casing 100, the battery cell 300 and the tab 500 can be ensured to work in a sealed environment, effectively preventing electrolyte leakage or the intrusion of external gases and moisture, thereby ensuring the integrity and stability of the battery's internal structure.

[0046] It should be noted that the battery casing 100 and battery cover can be made of metal, such as aluminum, but are not limited to aluminum. For example, they can also be made of steel or other conductive metals that do not react with the electrolyte inside the battery. The battery casing 100 and battery cover can be made of the same metal or different metals, which will not be elaborated here.

[0047] This application provides a battery cover, as shown in Figures 1 to 3, including a cover body 200. The cover body 200 includes a metal cover plate 210 and an insulating ring 220. One end of the metal cover plate 210 is connected to the insulating ring 220, and the other end of the insulating ring 220 is connected to the battery casing 100. The metal cover plate 210 is used for electrical connection with the battery tabs 500. A first protrusion 221 is connected to the insulating ring 220 and is located at the end of the insulating ring 220 facing away from the metal cover plate. The first protrusion 221 has a ring structure, and its thickness gradually decreases along the thickness of the metal cover plate 210 and away from the metal cover plate 210. The first protrusion 221 is used for insulation between the tabs 500 and the casing 100. In this way, the metal cover plate 210 is brazed to one end of the insulating ring 220, and the other end of the insulating ring 220 is brazed to the outer shell 100, thereby connecting the outer shell 100 and the cover 200.

[0048] The insulating ring 220 is located between the metal cover 210 and the battery casing 100, serving as a barrier and insulator to prevent safety hazards such as short circuits or leakage inside the battery. Simultaneously, the insulating ring 220 possesses sufficient mechanical strength to withstand vibrations and impacts that may occur during battery operation. It should be noted that the insulating ring 220 is preferably made of ceramic, but is not limited to ceramic; for example, it can also be made of other insulating materials such as PPS injection molding or glass.

[0049] Understandably, the first protrusion 221 on the insulating ring 220 can ensure the insulation between the tab 500 and the outer casing 100. The first protrusion 221, which is set along the extension direction of the cell 300, can effectively isolate the contact between the tab 500 and the outer casing 100, and prevent the contact between the tab 500 and the metal casing 100 from causing a short circuit in the battery.

[0050] In some embodiments of this application, as shown in Figures 5 and 7, the annular structure of the first protrusion 221 is conical, with a first end and a second end. The first end faces the metal cover plate 210 and is connected to the insulating ring 220, while the second end faces the top of the battery cell 300, and the first end is larger than the second end. Thus, the first protrusion 221 has a gradually changing conical surface on the cavity side of the outer casing 100, ensuring sufficient insulation without affecting the overall structure and performance of the battery cover.

[0051] As shown in Figure 7, the first end of the cone, i.e., the larger end of the cone, is connected to the insulating ring 220, forming a relatively large insulating barrier between the tab 500 and the outer casing 100. The second end of the cone, i.e., the smaller end of the cone, overlaps with the insulating film 400 on the outside of the cell 300, forming a certain insulating distance. This ensures that the thickness of the insulating layer is effectively increased without affecting the space utilization inside the battery casing 100, thereby improving the overall insulation performance.

[0052] Furthermore, it is understandable that the conical design of the first protrusion 221 of the insulating ring 220 may simplify the assembly process of the battery cover. During assembly, the conical surface can serve as a guide structure, helping the metal cover 210 and the insulating ring 220 to be installed more smoothly onto the housing 100, reducing assembly errors and assembly difficulty.

[0053] In some embodiments of this application, as shown in Figures 5 to 8, the inclination angle of the conical surface of the first protrusion 221 is α, and α is between 0.5° and 70°. For example, it can be 0.5°, 25°, 65° or 70°, etc. The inclination angle of the conical surface of the first protrusion 221 can be limited according to the actual working conditions.

[0054] Understandably, when the inclination angle α of the first protrusion 221's conical surface is small, the assembly space between the metal cover 210 and the outer casing 100 becomes relatively narrow, which is not conducive to the assembly between the metal cover 210 and the outer casing 100. Due to the limited assembly space, the metal cover 210 may have unnecessary contact or friction with the tab 500 of the battery cell 300 during the assembly process, thereby increasing the possibility of damage to the tab 500.

[0055] When the inclination angle α of the first protrusion 221's conical surface is large, the contact area (i.e., the weldable area) between the tab 500 and the metal cover plate 210 will decrease accordingly, which may lead to a decrease in weld quality or even a weak weld. Furthermore, due to the reduced contact area, current may encounter greater resistance when passing through this area, increasing connection impedance. This results in the battery generating more heat during charging and discharging, reducing battery efficiency, and potentially accelerating battery aging.

[0056] In some embodiments of this application, as shown in Figures 5 to 8, the height of the first protrusion 221 in the thickness direction of the metal cover plate 210 is H, and H is between 0.3 and 4 mm. For example, it can be 0.3 mm, 0.7 mm, 1.5 mm, 2.5 mm or 4 mm, etc. The height of the first protrusion 221 can be limited according to the actual working conditions.

[0057] Understandably, when the height of the first protrusion 221 is small, for example less than 0.3 mm, in order to ensure the insulation effect between the tab 500 and the metal casing 100, the height of the insulating film 400 of the cell 300 needs to be increased to meet the interference fit requirements. This may increase the possibility of burning the insulating film 400 when the metal cover 210 is welded to the tab 500, thereby causing a decrease in insulation performance and affecting the safety and stability of the battery during subsequent discharge.

[0058] When the height of the first protrusion 221 is large, for example, greater than 4mm, the strength of the insulating ring 220 cannot meet the design requirements. It is insufficient to withstand the stress and vibration that the battery may encounter during use, and it cannot provide sufficient support, leading to a decrease or failure of insulation performance. Understandably, an excessively high first protrusion 221 may also increase the possibility of contact or compression between the cell 300 and the casing 100 or between the cell 300 and the first protrusion 221, potentially causing damage to the cell 300, resulting in cracking or short circuits, thus affecting the battery's performance and lifespan.

[0059] In some embodiments of this application, as shown in Figures 5 and 7, the metal cover plate 210 faces the cavity, and a groove 211 is provided on the outer edge of the metal cover plate 210. The top surface of the insulating ring 220 is connected to the bottom surface of the groove 211. The inner surface of the insulating ring 220 abuts against the groove 211. In this way, the groove 211 provides a positioning and fixing function for the insulating ring 220, and the insulating ring 220 can be accurately placed in the groove 211 during assembly and welding, ensuring the accuracy of the relative position of the top of the insulating ring 220 and the metal cover plate 210.

[0060] Understandably, the inner side of the insulating ring 220 abuts against the groove 211 of the metal cover plate 210, forming a tight fit to ensure good contact between the insulating ring 220 and the metal cover plate 210, which helps to ensure the insulation effect and also helps to transfer heat and disperse stress.

[0061] It should be noted that the groove 211 is provided on the outer edge of the metal cover plate 210, and the outer wall of the groove 211 and the outer wall of the metal cover plate 210 are integrally designed. This design can be as described above, but is not limited to it. For example, the outer wall of the groove 211 and the outer wall of the metal cover plate 210 do not have to be integrally designed; that is, the outer wall of the metal cover plate 210 is the inner wall of the groove 211. An annular groove 211 can be stamped on the side of the metal cover plate 210 facing the cavity through integral stamping.

[0062] In some embodiments of this application, as shown in Figures 3 and 7, the cover 200 further includes a connecting ring 230. The metal cover 210 is connected to the connecting ring 230 via an insulating ring 220, and the connecting ring 230 is used to connect to the outer casing 100. The insulating ring 220 is connected to the outer casing 100 via the connecting ring 230. Thus, when the battery cell 300 is finally encapsulated and soldered, the connecting ring 230, as a connector between the metal cover 210 and the insulating ring 220, can form a sealing barrier and enhance the structural strength, ensuring that the heat generated during soldering can be transferred and dissipated through the connecting ring 230, preventing damage to the insulating ring 220 and the metal cover 210 due to excessively high temperatures during brazing.

[0063] It should be noted that the connecting ring 230 can be made of the same metal material as the battery casing 100, preferably aluminum, but it is not limited to aluminum. For example, it can also be made of steel or a conductive metal material that does not react with the electrolyte inside the battery.

[0064] In some embodiments of this application, as shown in Figures 3 and 7, the connecting ring 230 is sleeved on the first protrusion 221 of the insulating ring 220, and the top surface of the connecting ring 230 is connected to the bottom surface of the insulating ring 220. This simplifies the assembly process, allowing the first protrusion 221 to ensure precise positioning between the connecting ring 230 and the insulating ring 220, ensuring the connecting ring 230 is placed in the correct position and guaranteeing stable contact between them.

[0065] The top surface of the connecting ring 230 and the bottom surface of the insulating ring 220 are tightly connected by brazing, which improves the stability and reliability of the battery and prevents impurities from the external environment from entering the cell 300, ensuring the safety and performance stability of the cell 300. In addition, the connecting ring 230 can also withstand some of the stress and impact during subsequent use, protecting the cell 300 from vibration or impact damage.

[0066] In some embodiments of this application, please continue to refer to FIG7. Along the length direction of the outer shell 100, a second protrusion 231 is provided on the bottom surface of the connecting ring 230, and the side of the second protrusion 231 facing the cavity is connected to the side of the first protrusion 221 facing away from the cavity. The side of the second protrusion 231 facing away from the cavity is connected to a portion of the inner sidewall of the outer shell 100. In this way, the second protrusion 231 is arranged along the longitudinal extension direction of the outer shell 100, which can enhance the connection strength between the connecting ring 230 and the outer shell 100, and improve the stability and durability of the entire structure. Furthermore, during the welding process, the second protrusion 231 on the connecting ring 230 can also ensure that the insulating ring 220 is not damaged during the brazing process, avoiding insulation failure between the electrode tab 500 of the battery cell 300 and the outer shell 100.

[0067] It is understandable that the connecting ring 230 and the second protrusion 231 can be integrally stamped. Referring to Figure 7, the side of the second protrusion 231 of the connecting ring 230 facing the cavity (i.e., the inner side of the connecting ring 230 and the second protrusion 231) is connected to the side of the first protrusion 221 of the insulating ring 220 facing away from the cavity (i.e., the outer side of the first protrusion 221 of the insulating ring 220). The side of the second protrusion 231 of the connecting ring 230 facing away from the cavity (i.e., the outer side of the second protrusion 231) is connected to a portion of the inner wall of the outer casing 100, and the bottom surface of the connecting ring 230 is connected to the top surface of the outer casing 100. This forms a seal between the outer casing 100 and the cover 200.

[0068] In some embodiments of this application, as shown in Figures 1 and 2, a first battery cover 201 and a second battery cover 202 are respectively provided at both ends of the battery casing 100, and the first battery cover 201 and the second battery cover 202 are respectively located at the openings at both ends of the casing 100.

[0069] In one possible implementation, both the first battery cover 201 and the second battery cover 202 can adopt the battery cover with the connecting ring 230 described above. It is understood that the use of battery covers with the connecting ring 230 in both the first battery cover 201 and the second battery cover 202 can make the connection between the entire battery casing 100 and the cover 200 more uniform and coordinated in appearance and performance.

[0070] In another possible implementation, one of the first battery cover 201 and the second battery cover 202 adopts the battery cover without the connecting ring 230 described above, and the other adopts the battery cover with the connecting ring 230 described above. In this embodiment of the application, for ease of explanation, the first battery cover 201 in the following embodiments is a battery cover without the connecting ring 230, and the insulating ring 220 of the first battery cover 201 is connected to one end of the outer casing 100. The second battery cover 202 is a battery cover with the connecting ring 230, and the connecting ring 230 of the second battery cover 202 is connected to the other end of the outer casing 100.

[0071] Understandably, in this implementation, a hybrid approach to battery covers is used. The first battery cover 201, which does not have a connecting ring 230, reduces costs while ensuring insulation. The insulating ring 220 of the first battery cover 201 is pre-connected directly to the outer casing 100, which can be achieved using ceramic brazing. The battery cell 300 is then installed into the outer casing 100, and assembled and welded to the first battery cover 201. After electrically connecting the tabs 500 of the battery cell 300 to the metal cover plate 210, the second battery cover 202, equipped with a connecting ring 230, is laser-welded to the other end of the outer casing 100 to ensure the sealing and insulation of the battery cell 300.

[0072] In some embodiments of this application, as shown in FIG4, an insulating film 400 is further included. The insulating film 400 is disposed on the outside of the battery cell 300, and its two ends extend to the tabs 500. The battery cell 300 and the outer casing 100 are insulated from each other by the insulating film 400 and the insulating ring 220. In this way, the insulating film 400 directly wraps around the outside of the battery cell 300, forming an electrical isolation layer, effectively preventing direct electrical contact between the battery cell 300 and the metal casing 100, and preventing fires, explosions, and other situations that may be caused by electrical short circuits. The insulating film 400 also has a certain physical protection function, which can buffer the impact of external shocks and vibrations on the battery cell 300, reducing the possibility of damage to the battery cell 300. It can also prevent the battery cell 300 from direct contact with corrosive substances in the external environment, extending the service life of the battery cell 300.

[0073] Understandably, the two ends of the insulating film 400 extend onto the tabs 500, which helps to further enhance the seal between the cell 300 and the casing 100, preventing moisture, dust, and other impurities from the external environment from entering the cell 300. The insulating ring 220 is located between the battery cover and the casing 100. Together with the insulating film 400, the insulating ring 220 forms a multi-layered insulating barrier, ensuring the safety and reliability of the battery.

[0074] In some embodiments of this application, as shown in Figures 5 to 8, the first protrusion 221 of the insulating ring 220 overlaps with the end of the insulating film 400, and the overlap amount is L, where L is between 0.1 and 4.5 mm. The first protrusion 221 is used to insulate the tab 500 from the outer casing 100. This ensures close contact between the insulating ring 220 and the insulating film 400, jointly enhancing the insulation effect between the tab 500 and the outer casing 100. Furthermore, it makes the insulating film 400 and the insulating ring 220 more stable inside the battery, helping to reduce loosening or displacement caused by vibration or impact, thereby improving the overall structural stability of the battery.

[0075] It should be noted that the overlap can be 1-2mm, but it is not limited to 1-2mm. For example, it can also be 0.1mm, 1.5mm, 2.5mm, or 4.5mm, etc., depending on the actual working conditions. When the overlap L is small, it is difficult to ensure a tight assembly and the internal insulation of the battery. When the overlap is large, it will increase the assembly difficulty and cause stress concentration, and will also increase manufacturing costs.

[0076] In some embodiments of this application, as shown in Figures 5 to 8, the distance between the outer surface of the first protrusion 221 and the inner surface of the housing 100 is d, and d is between -0.5 and 2.0 mm. It is understood that when d > 0 mm, for example, d can be 0.5 mm, 1 mm, or 2 mm, a certain gap exists between the outer surface of the first protrusion 221 and the inner surface of the housing 100. This ensures that the insulating ring 220 has sufficient space during installation or operation to accommodate minor changes caused by thermal expansion, mechanical vibration, or other external environmental factors, thereby avoiding stress concentration or damage due to excessively tight contact. Furthermore, the gap provides additional buffer space, helping to reduce the potential impact of external impacts or vibrations on the insulating ring 220 and the tab 500.

[0077] When d = 0 mm, the outer surface of the first protrusion 221 is in perfect contact with the inner surface of the outer casing 100, without any gap. This eliminates any gaps that could lead to current leakage or damage to the battery caused by external environmental factors such as moisture or dust entering through gaps, while ensuring maximum insulation and structural stability.

[0078] When d < 0 mm, for example, d can be -0.1 mm, -0.3 mm, or -0.5 mm, the outer surface of the first protrusion 221 penetrates the inner surface of the outer casing 100, forming an interference fit. This ensures that the first protrusion 221 of the insulating ring 220 is in close contact with the inner surface of the outer casing 100, thus eliminating interference. This completely eliminates any gaps that could lead to current leakage, or the possibility of external environmental factors such as moisture or dust entering the battery and causing damage.

[0079] In some embodiments of this application, the tab 500 includes a positive tab 500 and a negative tab 500. The first battery cover 201 is the positive cover 200, and the second battery cover 202 is the negative cover 200. The positive tab 500 is connected to the positive metal cover plate 210 of the positive cover 200, and the negative tab 500 is connected to the negative metal cover plate 210 of the negative cover 200. In this way, the tab 500 allows the current from the cell 300 to flow smoothly in or out. It should be noted that in this embodiment, the first battery cover 201 is defined as the positive metal cover plate and connected to the positive tab 500, and the second battery cover 202 is defined as the negative metal cover plate and connected to the negative tab 500. However, this is not limited to the above limitation; for example, the positive and negative tabs 500 can also be disposed at one end and electrically connected to the battery metal cover plate.

[0080] In some embodiments of this application, as shown in Figures 1, 2, and 4, the positive electrode metal cover plate 210 is provided with a first opening 212 and a second opening 213, both of which are connected to the cavity. An explosion-proof valve is provided on the first opening 212. A sealing cap 240 is provided on the second opening 213, through which electrolyte is injected into the cavity.

[0081] Thus, the first opening 212 and the second opening 213 are connected to the cavity of the outer casing 100. An explosion-proof valve can be installed on the first opening 212. It should be noted that the explosion-proof valve is used to automatically open when the internal pressure of the battery abnormally increases (such as due to overcharging, short circuit, thermal runaway, etc.), releasing the internal pressure to prevent the battery from exploding or rupturing, effectively reducing the possibility of the battery exploding under extreme conditions. Electrolyte can be injected into the cavity of the outer casing 100 through the second opening 213. The electrolyte reacts chemically with the battery cell 300 inside the cavity to generate electrical energy. A sealing cap 240 is installed on the second opening 213 to seal it, preventing electrolyte leakage and the entry of external impurities into the battery.

[0082] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0083] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0084] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this 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 one or more embodiments or examples.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cover, characterized in that, include: A metal cover plate (210) and an insulating ring (220), wherein one end of the metal cover plate (210) is connected to the insulating ring (220), and the other end of the insulating ring (220) is connected to the battery casing (100); The metal cover plate (210) is used for electrical connection with the battery tabs (500); The first protrusion (221) is connected to the insulating ring (220). The first protrusion (221) is located at the end of the insulating ring (220) facing away from the metal cover plate. The first protrusion (221) has an annular structure. Along the thickness of the metal cover plate (210) and away from the metal cover plate (210), the thickness of the first protrusion (221) gradually decreases. The first protrusion (221) is used to insulate between the tab (500) and the outer shell (100).

2. The battery cover according to claim 1, characterized in that, The annular structure of the first protrusion (221) is conical, the conical surface having a first end and a second end, the first end facing the metal cover plate (210) and connected to the insulating ring (220), the second end facing the top of the cell (300), and the first end being larger than the second end.

3. The battery cover according to claim 2, characterized in that, The inclination angle of the conical surface of the first protrusion (221) is α, and α is between 0.5° and 70°.

4. The battery cover according to claim 3, characterized in that, In the thickness direction of the metal cover plate (210), the height of the first protrusion (221) is H, and H is between 0.3 and 4 mm.

5. The battery cover according to claim 4, characterized in that, The metal cover plate (210) has a groove (211) on the side facing the inner cavity of the outer shell (100), and the groove (211) is located on the outer edge of the metal cover plate (210). The top surface of the insulating ring (220) is connected to the bottom surface of the groove (211). The inner side of the insulating ring (220) abuts against the groove (211).

6. The battery cover according to any one of claims 2-5, characterized in that, It also includes a connecting ring (230), the metal cover plate (210) and the connecting ring (230) are connected through the insulating ring (220), and the connecting ring (230) is used to connect to the outer shell (100), the insulating ring (220) is connected to the outer shell (100) through the connecting ring (230).

7. The battery cover according to claim 6, characterized in that, The connecting ring (230) is sleeved on the first protrusion (221) of the insulating ring (220), and the top surface of the connecting ring (230) is connected to the bottom surface of the insulating ring (220).

8. The battery cover according to claim 7, characterized in that, Along the length direction of the outer shell (100), a second protrusion (231) is provided on the bottom surface of the connecting ring (230), and the side of the second protrusion (231) facing the inner cavity of the outer shell (100) is connected to the side of the first protrusion (221) away from the inner cavity of the outer shell (100); The side of the second protrusion (231) facing away from the inner cavity of the outer shell (100) is connected to a portion of the inner wall of the outer shell (100); The connecting ring (230) is made of metal.

9. A battery, characterized in that, include: The outer shell (100) has a cavity inside, and the outer shell (100) has openings at both ends that communicate with the cavity; A first battery cover (201) and a second battery cover (202) are respectively located at the two end openings of the outer casing (100). One of the first battery cover (201) and the second battery cover (202) adopts the battery cover described in any one of claims 1-5 above, and the other adopts the battery cover described in any one of claims 6-8 above. Alternatively, both the first battery cover (201) and the second battery cover (202) may be battery covers as described in any one of claims 6-8. A battery cell (300) is located in the cavity, and the battery cell (300) has tabs (500) at both ends, which are electrically connected to the metal cover plates (210) of the first battery cover (201) and the second battery cover (202).

10. The battery according to claim 9, characterized in that, The first battery cover (201) adopts the battery cover according to any one of claims 1-5, and the insulating ring (220) of the first battery cover (201) is connected to one end of the outer shell (100); The second battery cover (202) is the battery cover according to any one of claims 6-8, and the connecting ring (230) of the second battery cover (202) is connected to the other end of the outer shell (100).

11. The battery according to claim 10, characterized in that, It also includes an insulating film (400) disposed on the outside of the battery cell (300), with both ends of the insulating film (400) extending to the tabs (500), and the battery cell (300) and the outer casing (100) being insulated from each other by the insulating film (400) and the insulating ring (220).

12. The battery according to claim 11, characterized in that, The first protrusion (221) of the insulating ring (220) overlaps with the end of the insulating film (400), and the overlap amount is L, where L is between 0.1 and 4.5 mm. The first protrusion (221) is used to insulate between the tab (500) and the outer shell (100).

13. The battery according to claim 12, characterized in that, The distance between the outer surface of the first protrusion (221) and the inner surface of the outer shell (100) is d, and d is between -0.5 and 2.0 mm.

14. The battery according to claim 13, characterized in that, The electrode tab (500) includes a positive electrode tab (500) and a negative electrode tab (500); The first battery cover (201) is a positive electrode cover (200), the second battery cover (202) is a negative electrode cover (200), the positive electrode tab (500) is connected to the positive electrode metal cover plate (210) of the positive electrode cover (200), and the negative electrode tab (500) is connected to the negative electrode metal cover plate (210) of the negative electrode cover (200).

15. The battery according to claim 14, characterized in that, The positive electrode metal cover plate (210) is provided with a first opening (212) and a second opening (213), and both the first opening (212) and the second opening (213) are connected to the cavity; An explosion-proof valve is provided on the first opening (212); The second opening (213) is provided with a sealing cap (240), and electrolyte is injected into the cavity through the second opening (213).

16. A battery pack, characterized in that, include: The battery according to any one of claims 9-15.

17. An electrical appliance, characterized in that, include: An electrical device, and the battery pack of claim 16 or the battery of any one of claims 9-15, wherein the battery pack or the battery is used to provide electrical energy to the electrical device.

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