Battery cover, battery, battery pack and electric equipment

Abstract

The utility model provides a battery cover, a battery, a battery pack and electric equipment, and belongs to the technical field of batteries. 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 with one end of the insulating ring, and the other end of the insulating ring is used for being connected with a shell of the battery. And the metal cover plate is electrically connected with a tab of the battery. A first bulge is arranged on the insulating ring along the extension direction of a battery cell of the battery, and is used for insulating the tab from the shell. It can be understood that the metal cover plate is directly connected with the tabs of the battery to realize electric conduction, and the metal cover plate and the battery shell are insulated and isolated through the insulating ring to ensure electrical isolation. And the first bulge on the insulating ring effectively provides an insulating barrier for the possibility of potential short circuit between the tab and the shell, so that the safety performance of the battery is further enhanced.

Description

Technical Field

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

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

[0003] The existing insulation structure on both sides of the battery cell contains a large number of parts, which makes the assembly process complicated and riveting difficult. In addition, the strength requirements may not be met after riveting. At the same time, riveting can easily damage the PPS material on the battery shell and may cause high-voltage breakdown, reducing the overall safety and durability of the battery. Utility Model Content

[0004] The embodiments of the present application provide a battery cover, a battery, a battery pack and an electrical device. By integrating the outer shell and the battery cover into one and adopting direct welding technology to connect the battery cell tabs, the collecting plate is eliminated. At the same time, the inner convex insulating ring is closely matched with the battery cell insulating film to effectively achieve all-round insulation protection, which not only simplifies the structure but also reduces the possibility of thermal runaway, thereby improving the safety and overall performance of the battery.

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

[0006] In a first aspect, an embodiment of the present application provides a battery cover, comprising:

[0007] A cover body, the cover body comprising a metal cover plate and an insulating ring, the metal cover plate being connected to one end of the insulating ring, and the other end of the insulating ring being connected to the outer shell of the battery;

[0008] The metal cover is used to be electrically connected to the tab of the battery;

[0009] A first protrusion (221), the first protrusion (221) is connected to the insulating ring (220), the first protrusion (221) is located at one end of the insulating ring (220) facing away from the metal cover plate, and the first protrusion (221) is an annular structure, and the thickness of the first protrusion (221) gradually decreases along the thickness of the metal cover plate (210) and in a direction away from the metal cover plate (210), and the first protrusion (221) is used to insulate between the tab (500) and the housing (100).

[0010] Beneficial effects of the embodiments of the present application: The battery cover provided in the embodiments of the present application includes a cover body, the cover body includes 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 to be connected to the outer shell of the battery. The metal cover plate is used to be electrically connected to the pole tab of the battery. Along the extension direction of the battery cell, the insulating ring has a first protrusion, and the first protrusion is used to insulate between the pole tab and the outer shell. It can be understood that the metal cover plate is directly connected to the pole tab of the battery to achieve electrical conduction, and the metal cover plate is insulated and isolated from the battery outer shell by the insulating ring to ensure electrical isolation. The first protrusion on the insulating ring effectively provides an insulating barrier against the possibility of potential short circuit between the pole tab and the outer shell, thereby further enhancing the safety performance of the battery.

[0011] In a possible embodiment, the annular structure of the first protrusion (221) is a conical surface, the conical surface having a first end and a second end, the first end facing the metal cover (210) and connected to the insulating ring (220), the second end facing the top of the battery cell (300), and the second end being larger than the first end. In this way, the first protrusion has a gradually changing conical surface facing the cavity of the shell, which can ensure that the overall structure and performance of the battery cover are not affected while providing sufficient insulation effect.

[0012] In one possible embodiment, the inclination angle of the conical surface of the first protrusion is α, and α is between 0.5° and 70°. Thus, limiting the conical surface of the first protrusion to a certain range can prevent the metal cover from making unnecessary contact or friction with the battery cell's tabs during assembly due to limited assembly space, thereby increasing the possibility of damage to the tabs. It can also prevent the current from encountering greater obstruction when passing through this area due to the reduced contact area, increasing the connection impedance, and causing the battery to generate more heat during charging and discharging, reducing battery efficiency, and potentially accelerating battery aging.

[0013] In one possible embodiment, in the thickness direction of the metal cover, the height of the first protrusion is H, and H is between 0.3 and 4 mm. In this way, limiting the height of the first protrusion to a certain range can avoid the need to increase the height of the battery cell insulation film to meet the interference overlap requirement in order to ensure the insulation effect between the tab and the metal shell, which may increase the possibility of scalding the insulation film when the metal cover and the tab are welded. It can also avoid the situation where the height of the first protrusion is too high, resulting in the strength of the insulation ring failing to meet the design requirements, being insufficient to withstand the stress vibration that the battery may encounter during use, and failing to provide sufficient support force, resulting in a decrease in insulation performance or failure.

[0014] In one possible embodiment, a groove is provided on the surface of the metal cover facing the inner cavity of the housing. The groove is located on the outer edge of the metal cover, and the top surface of the insulating ring is connected to the bottom surface of the groove; the inner surface of the insulating ring abuts the groove. This provides a positioning and securing function for the insulating ring, allowing the insulating ring 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.

[0015] In one possible embodiment, the cover further includes a connecting ring, the metal cover plate and the connecting ring being connected via the insulating ring, and the connecting ring being used to connect to the outer shell, and the insulating ring being connected to the outer shell via the connecting ring. Thus, the connecting ring, serving as a connector between the metal cover plate and the insulating ring, can be used to form a sealing barrier and enhance structural strength, ensuring that heat generated during welding can be transferred and dissipated through the connecting ring, thereby preventing damage to the insulating ring and metal cover plate due to excessive temperatures during brazing.

[0016] In one possible embodiment, the connecting ring is sleeved onto the first protrusion of the insulating ring, with the top surface of the connecting ring connected to the bottom surface of the insulating ring. This simplifies the assembly process, and the first protrusion can be used to ensure precise positioning between the connecting ring and the insulating ring, placing the connecting ring in the correct position and ensuring stable contact between the connecting ring and the insulating ring.

[0017] In one possible embodiment, a second protrusion is provided on the bottom surface of the connecting ring along the length direction of the shell, and the side of the second protrusion facing the inner cavity of the shell is connected to the side of the first protrusion facing away from the inner cavity of the shell; the side of the second protrusion facing away from the inner cavity of the shell is connected to a portion of the inner side wall of the shell; and the connecting ring (230) is made of metal. In this way, the second protrusion is provided along the longitudinal extension direction of the shell, which can enhance the connection strength between the connecting ring and the shell, and improve the stability and durability of the entire structure. In addition, during the welding process, the second protrusion on the connecting ring can also ensure that the insulating ring is not damaged during the brazing process, thereby avoiding insulation failure between the battery cell's tab and the shell.

[0018] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0019] A housing having a cavity therein and openings at both ends of the housing communicating with the cavity;

[0020] a first battery cover and a second battery cover, the first battery cover and the second battery cover being respectively located at the two end openings of the housing, one of the first battery cover and the second battery cover being the battery cover without the connecting ring, and the other being the battery cover with the connecting ring;

[0021] Alternatively, both the first battery cover and the second battery cover are battery covers with connecting rings;

[0022] The battery cell is located in the cavity, and pole tabs are respectively provided at both ends of the battery cell, and the pole tabs are respectively electrically connected to the metal cover plates of the first battery cover and the second battery cover.

[0023] In a possible embodiment, the first battery cover may be the above-mentioned battery cover without a connecting ring, and the insulating ring of the first battery cover is connected to one end of the outer shell; the second battery cover may be the above-mentioned battery cover with a connecting ring, and the connecting ring of the second battery cover is connected to the other end of the outer shell.

[0024] In one possible embodiment, an insulating film is further included. The insulating film is disposed on the outside of the battery cell, with both ends of the insulating film extending onto the tabs. The battery cell and the outer casing are insulated by the insulating film and the insulating ring. In this way, 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 fires and explosions that could be caused by electrical short circuits. It also prevents direct contact between the battery cell and corrosive substances in the external environment, extending the battery cell's service life.

[0025] In one possible embodiment, the first protrusion of the insulating ring overlaps the end of the insulating film, and the overlap is L, which is between 0.1 and 4.5 mm. The first protrusion is used to insulate the tab from the outer shell. This ensures close contact between the insulating ring and the insulating film, jointly enhancing the insulation between the tab and the outer shell. It also further stabilizes the insulating film and insulating ring within the battery, helping to reduce loosening or displacement caused by vibration or impact, thereby improving the overall structural stability of the battery.

[0026] In a possible implementation manner, a distance between an outer surface of the first protrusion and an inner surface of the housing is d, and d is between -0.5 and 2.0 mm.

[0027] In one possible embodiment, the tabs include a positive tab and a negative tab; the first battery cover is a positive electrode cover, and the second battery cover is a negative electrode cover. The positive tab is connected to the positive metal cover of the positive electrode cover, and the negative tab is connected to the negative metal cover of the negative electrode cover. In this way, the current of the battery cell can flow smoothly into or out through the tabs.

[0028] In one possible embodiment, the positive electrode metal cover is provided with a first opening and a second opening, both of which are connected to the cavity. An explosion-proof valve is provided on the first opening, and a sealing cover is provided on the second opening, through which electrolyte is injected into the cavity. This explosion-proof valve releases internal pressure to prevent battery explosion or rupture, effectively reducing the likelihood of the battery exploding or rupturing under extreme conditions. A sealing cover is provided on the second opening, which seals the second opening. Electrolyte can be injected into the cavity of the housing through the second opening, where it chemically reacts with the battery cells within the cavity to generate electricity.

[0029] In a third aspect, an embodiment of the present application further provides a battery pack comprising the above-mentioned battery.

[0030] In a fourth aspect, the present application also provides an electrical device, including

[0031] An electrical device, and the above-mentioned battery pack or the above-mentioned battery, wherein the battery pack or the battery is used to provide electrical energy to the electrical device.

[0032] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery cover, battery, battery pack and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are only part of the embodiments of the present application. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 A schematic diagram of the structure of the battery cover and housing provided in an embodiment of the present application;

[0035] Figure 2 An exploded view of the battery cover and housing provided in an embodiment of the present application;

[0036] Figure 3 An exploded view of a battery cover provided in an embodiment of the present application;

[0037] Figure 4 A cross-sectional view of a battery provided in an embodiment of the present application;

[0038] Figure 5 A partial enlarged view of the first battery cover provided in an embodiment of the present application;

[0039] Figure 6 A dimensional diagram of the first battery cover provided in an embodiment of the present application;

[0040] Figure 7 A partial enlarged view of the second battery cover provided in an embodiment of the present application;

[0041] Figure 8 This is a dimensional diagram of the second battery cover provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100-housing; 200-cover; 300-battery core; 400-insulating film; 500-tab;

[0044] 201-first battery cover; 202-second battery cover;

[0045] 210-metal cover; 220-insulating ring; 230-connecting ring; 240-sealing cover;

[0046] 211 - groove; 212 - first opening; 213 - second opening;

[0047] 221-first protrusion;

[0048] 231-Second bulge. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] Figure 1 This is a schematic diagram of the structure of the battery cover and housing provided in an embodiment of the present application. Figure 2 This is an exploded view of the battery cover and housing provided in an embodiment of the present application. Figure 3 This is an exploded view of the battery cover provided in an embodiment of the present application. Figure 4 A cross-sectional view of a battery provided in an embodiment of the present application, Figure 5 This is a partial enlarged view of the first battery cover provided in an embodiment of the present application. Figure 6 This is a dimensional diagram of the first battery cover provided in an embodiment of the present application. Figure 7This is a partial enlarged view of the second battery cover provided in an embodiment of the present application. Figure 8 This is a dimensional diagram of the second battery cover provided in an embodiment of the present application.

[0051] An embodiment of the present application provides an electric device, which includes an electric device and a battery pack or battery, and the battery pack or battery provides electric energy to the electric device. For example, the electric device can be a vehicle or an energy storage device. When the electric device is a vehicle, the vehicle can be an electric vehicle / electric vehicle, a fuel vehicle, or a hybrid vehicle. The electric device can be an electric motor, a control system, a lighting system, etc. When the electric device is an energy storage device, the electric device can be an inverter, a controller, etc. The battery pack can include multiple batteries, and the multiple batteries can store and output electric energy through a certain connection method and control system. The battery pack or battery can provide electric energy to the electric device to meet the normal operation of the device.

[0052] The embodiment of the present application provides a battery, which can be a cylindrical battery, a narrow and long square shell battery, or a battery of other shapes, which is not limited here. Figure 4 As shown, it includes a housing 100, a battery cover, and a battery cell 300. The housing 100 has a cavity inside, and the housing 100 has openings at both ends that communicate with the cavity. The battery cover is connected to both ends of the housing 100 to seal the battery cell 300 in the cavity. The battery cell 300 is located in the cavity, and the battery cell 300 has tabs 500 at both ends. The tabs 500 are electrically connected to the battery covers at both ends of the housing 100.

[0053] It can be understood that the shell wraps and fixes the battery cell 300 and the tab 500 to prevent the battery cell 300 and the tab 500 from mechanical damage caused by external vibration, impact, etc. The battery cover is used to seal the battery cell 300 and the tab 500 in the cavity of the outer shell 100. Through the close fit between the battery cover and the outer shell 100, it can ensure that the battery cell 300 and the tab 500 work in a sealed environment, effectively preventing electrolyte leakage or external gas and moisture intrusion, thereby ensuring the integrity and stability of the internal structure of the battery.

[0054] It should be noted that the battery housing 100 and battery cover can be made of metal, such as aluminum, but are not limited to aluminum. For example, steel or other conductive metal materials that do not react with the electrolyte within the battery can also be used. The battery housing 100 and battery cover can be made of the same metal or different metal materials, which will not be detailed here.

[0055] The present application embodiment provides a battery cover, such as Figures 1 to 3As shown, the battery cover 200 includes a metal cover plate 210 and an insulating ring 220. The metal cover plate 210 is connected to one end of the insulating ring 220, and the other end of the insulating ring 220 is connected to the battery outer casing 100. The metal cover plate 210 is used to electrically connect to the battery tab 500. A 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 and gradually decreases in thickness along the thickness of the metal cover plate 210 and away from the metal cover plate 210. The first protrusion 221 is used to insulate the tab 500 from the outer casing 100. Thus, 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 casing 100, thereby connecting the outer casing 100 to the cover 200.

[0056] The insulating ring 220 is located between the metal cover 210 and the battery housing 100, providing isolation and insulation to prevent safety hazards such as short circuits or leakage within the battery. Furthermore, the insulating ring 220 possesses sufficient mechanical strength to withstand vibrations and shocks 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 materials. For example, other insulating materials such as PPS injection molding material and glass may also be used.

[0057] It can be understood that the first protrusion 221 on the insulating ring 220 can ensure the insulation between the tab 500 and the shell 100. Setting the first protrusion 221 along the extension direction of the battery cell 300 can effectively isolate the contact between the tab 500 and the shell 100, thereby preventing the contact between the tab 500 and the metal shell 100 from causing a battery short circuit.

[0058] In some embodiments of the present application, Figure 5 and Figure 7 As shown, the annular structure of the first protrusion 221 is a cone with a first end and a second end. The first end faces the metal cover 210 and is connected to the insulating ring 220, and the second end faces the top of the battery cell 300. The first end is larger than the second end. In this way, the first protrusion 221 has a gradually changing cone facing the cavity of the housing 100, ensuring that the overall structure and performance of the battery cover are not affected while providing sufficient insulation.

[0059] like Figure 7As shown, the first end of the cone, i.e., the larger end of the cone, is connected to the insulating ring 220, thereby forming a relatively large insulation isolation between the tab 500 and the housing 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 battery cell 300 to form a certain insulation distance, ensuring that the thickness of the insulating layer is effectively increased without affecting the space utilization inside the battery housing 100, thereby improving the overall insulation performance.

[0060] Furthermore, it is understood that the conical design of the first protrusion 221 of the insulating ring 220 may also simplify the assembly process of the battery cover. During the assembly process, the conical surface can serve as a guide structure, helping the metal cover 210 and the insulating ring 220 to be more smoothly installed on the housing 100, reducing assembly errors and difficulty.

[0061] In some embodiments of the present application, Figures 5 to 8 As shown, 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 actual working conditions.

[0062] It is understood that when the inclination angle α of the conical surface of the first protrusion 221 is small, the assembly space between the metal cover 210 and the housing 100 becomes relatively narrow, which is not conducive to the assembly of the metal cover 210 and the housing 100. Due to the limited assembly space, the metal cover 210 may come into 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.

[0063] When the inclination angle α of the conical surface of the first protrusion 221 is large, the contact area (i.e., the weldable area) between the tab 500 and the metal cover plate 210 is correspondingly reduced, which may lead to reduced welding quality or even a weak weld. In addition, due to the reduced contact area, the current may encounter greater resistance when passing through this area, increasing the connection impedance, thereby causing the battery to generate more heat during charging and discharging, reducing battery efficiency, and possibly accelerating battery aging.

[0064] In some embodiments of the present application, Figures 5 to 8 As shown, 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. 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 actual working conditions.

[0065] It is understandable that 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 shell 100, it is necessary to increase the height of the insulating film 400 of the battery cell 300 to meet the interference overlap requirement, which may increase the possibility of burning the insulating film 400 when welding the metal cover 210 and the tab 500, thereby resulting in a decrease in insulation performance and affecting the safety and stability of the battery during subsequent discharge.

[0066] 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, is insufficient to withstand the stress and vibration that the battery may encounter during use, and cannot provide sufficient support, resulting in a decrease in insulation performance or failure. It is understood that an excessively high first protrusion 221 may also increase the possibility of contact or compression between the battery cell 300 and the housing 100, or between the battery cell 300 and the first protrusion 221, causing damage to the battery cell 300, resulting in rupture or short circuit, and affecting the performance and life of the battery.

[0067] In some embodiments of the present application, Figure 5 and Figure 7 As shown, the metal cover 210 faces the cavity, and a groove 211 is provided on the outer edge of the metal cover 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 the groove 211. In this way, the groove 211 provides a positioning and fixing function for the insulating ring 220. During the assembly and welding process, the insulating ring 220 can be accurately placed in the groove 211, ensuring the accuracy of the relative position of the top of the insulating ring 220 and the metal cover 210.

[0068] It can be understood that the inner side surface 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.

[0069] 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 is integrally designed with the outer wall of the metal cover plate 210. The design may be as described above, but is not limited to the above design. For example, the outer wall of the groove 211 may not be integrally designed with the outer wall of the metal cover plate 210, that is, the outer wall of the metal cover plate 210 serves as the inner wall of the groove 211, and the annular groove 211 is stamped out on the side of the metal cover plate 210 facing the cavity through integral stamping.

[0070] In some embodiments of the present application, Figure 3 and Figure 7As shown, the cover 200 further includes a connecting ring 230. The metal cover 210 and the connecting ring 230 are connected via an insulating ring 220. The connecting ring 230 is used to connect to the outer shell 100, and the insulating ring 220 is connected to the outer shell 100 via the connecting ring 230. In this way, when the battery cell 300 is finally packaged and welded, the connecting ring 230 serves as a connector between the metal cover 210 and the insulating ring 220. The connecting ring 230 can be used to form a sealing barrier and enhance the strength of the structure, ensuring that the heat generated during welding can be transferred and dissipated through the connecting ring 230, thereby preventing damage to the insulating ring 220 and the metal cover 210 due to excessive temperatures during brazing.

[0071] It should be noted that the connecting ring 230 can be made of the same metal material as the battery housing 100, preferably aluminum, but not limited to aluminum. For example, it can also be made of steel or a metal conductive material that does not react with the electrolyte inside the battery.

[0072] In some embodiments of the present application, Figure 3 and Figure 7 As shown, 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, and the first protrusion 221 can be used to ensure accurate positioning between the connecting ring 230 and the insulating ring 220, so that the connecting ring 230 is placed in the correct position and stable contact between the connecting ring 230 and the insulating ring 220 is guaranteed.

[0073] The top surface of the connecting ring 230 and the bottom surface of the insulating ring 220 are tightly connected by brazing, improving the stability and reliability of the battery. This prevents impurities from the external environment from entering the battery cell 300, ensuring the safety and performance stability of the battery cell 300. Furthermore, the connecting ring 230 can also withstand some stress and impact during subsequent use, protecting the battery cell 300 from damage caused by vibration or impact.

[0074] In some embodiments of this application, please refer to Figure 7 Along the length direction of the 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 wall of the shell 100. In this way, the second protrusion 231 is arranged along the longitudinal extension direction of the shell 100, which can enhance the connection strength between the connecting ring 230 and the shell 100, and improve the stability and durability of the entire structure. In addition, 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, thereby avoiding insulation failure between the tab 500 of the battery cell 300 and the shell 100.

[0075] It is understandable that the connecting ring 230 and the second protrusion 231 can be formed by integral stamping. Figure 7 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 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 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 housing 100. The bottom surface of the connecting ring 230 is connected to the top surface of the housing 100. This forms a seal between the housing 100 and the cover 200.

[0076] In some embodiments of the present application, Figure 1 and Figure 2 As shown, a first battery cover 201 and a second battery cover 202 are respectively provided at both ends of the battery housing 100 . The first battery cover 201 and the second battery cover 202 are respectively located at the openings at both ends of the housing 100 .

[0077] In one possible implementation, the first battery cover 201 and the second battery cover 202 can both use the aforementioned battery cover with the connecting ring 230. It is understood that using the battery cover with the connecting ring 230 on both the first battery cover 201 and the second battery cover 202 can make the connection between the outer shell 100 and the cover 200 of the entire battery more unified and coordinated in appearance and performance.

[0078] In another possible implementation, one of the first battery cover 201 and the second battery cover 202 is a battery cover without the connecting ring 230, while the other is a battery cover with the connecting ring 230. In the embodiment of the present application, for ease of explanation, the first battery cover 201 in the following embodiment 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 shell 100. The second battery cover 202 is a battery cover with a connecting ring 230, and the connecting ring 230 of the second battery cover 202 is connected to the other end of the outer shell 100.

[0079] It is understandable that in this implementation, a hybrid battery cover is used. Using a first battery cover 201 without a connecting ring 230 can reduce 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 connected using ceramic brazing. The battery cell 300 is then loaded into the outer casing 100 and assembled and welded to the first battery cover 201. After the tabs 500 of the battery cell 300 are electrically connected to the metal cover 210, the second battery cover 202, which is provided 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.

[0080] In some embodiments of the present application, Figure 4 As shown, it also includes an insulating film 400, which is arranged on the outside of the battery cell 300. The two ends of the insulating film 400 extend to the tabs 500. The battery cell 300 and the shell 100 are insulated by the insulating film 400 and the insulating ring 220. In this way, the insulating film 400 is directly wrapped around the outside of the battery cell 300 to form an electrical isolation layer, effectively preventing direct electrical contact between the battery cell 300 and the metal shell 100, and preventing fires, explosions, etc. that may be caused by electrical short circuits. The insulating film 400 also has a certain physical protection effect, which can buffer the impact of external shocks and vibrations on the battery cell 300 and reduce 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, thereby extending the service life of the battery cell 300.

[0081] It is understood that the ends of the insulating film 400 extend onto the tabs 500, helping to further enhance the seal between the battery cell 300 and the housing 100, preventing moisture, dust, and other impurities from the external environment from entering the battery cell 300. The insulating ring 220 is located between the battery cover and the housing 100, and the insulating film 400 and the insulating ring 220 together form a multi-layered insulation barrier, jointly ensuring the safety and reliability of the battery.

[0082] In some embodiments of the present application, Figures 5 to 8 As shown, the first protrusion 221 of the insulating ring 220 overlaps the end of the insulating film 400, and the overlap amount is L, and L is between 0.1 and 4.5 mm. The first protrusion 221 is used to insulate the tab 500 from the shell 100. In this way, close contact between the insulating ring 220 and the insulating film 400 can be ensured, and the insulation effect between the tab 500 and the shell 100 can be enhanced. It can also make 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.

[0083] It should be noted that the overlap can be 1-2 mm, but it should be noted that it is not limited to 1-2 mm. For example, it can also be 0.1 mm, 1.5 mm, 2.5 mm or 4.5 mm, and can be set according to actual working conditions. When the overlap L is small, it is difficult to ensure the tightness of the assembly and the insulation of the battery. When the overlap is large, it will increase the difficulty of assembly and cause stress concentration, and it will also increase manufacturing costs.

[0084] In some embodiments of the present application, Figures 5 to 8As shown, 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, and there is a certain gap between the outer surface of the first protrusion 221 and the inner surface of the housing 100, which can ensure that the insulating ring 220 has sufficient space during installation or operation to adapt to slight changes caused by thermal expansion, mechanical vibration, or other external environmental factors, thereby avoiding stress concentration or damage caused by overly tight contact. In addition, the gap also provides additional buffer space, which helps to reduce the potential impact of external shock or vibration on the insulating ring 220 and the tab 500.

[0085] When d = 0 mm, the outer surface of the first protrusion 221 is in perfect contact with the inner surface of the housing 100, with no gaps. This eliminates any gaps that could cause current leakage or damage to the battery due to external environmental factors such as moisture or dust entering through gaps, while maintaining maximum insulation and structural stability.

[0086] When d is less than 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 housing 100, forming an interference fit, ensuring that the first protrusion 221 of the insulating ring 220 is in close contact with the inner surface of the housing 100, thereby completely eliminating any gaps that could cause current leakage or the possibility of external environmental factors such as moisture or dust entering the battery and causing damage to the battery.

[0087] In some embodiments of the present application, the tab 500 includes a positive tab 500 and a negative tab 500. The first battery cover 201 is a positive electrode cover, and the second battery cover 202 is a negative electrode cover. The positive tab 500 is connected to the positive metal cover plate 210 of the positive electrode cover, and the negative tab 500 is connected to the negative metal cover plate 210 of the negative electrode cover. In this way, the tab 500 can smoothly flow the current of the battery cell 300 into or out of it. It should be noted that in the embodiment of the present application, the first battery cover 201 plate is defined as a positive metal cover plate and is connected to the positive tab 500, and the second battery cover 202 plate is defined as a negative metal cover plate and is connected to the negative tab 500, but it is not limited to the above limitation. For example, the positive tab 500 and the negative tab 500 can also be set at one end and electrically connected to the battery metal cover.

[0088] In some embodiments of the present application, Figure 1 、 Figure 2 and Figure 4As shown, the positive 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.

[0089] In this way, the first opening 212 and the second opening 213 are connected to the cavity of the shell 100, and an explosion-proof valve can be provided 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 rises abnormally (such as due to overcharging, short circuit, thermal runaway, etc.), release the internal pressure of the cavity, so as to prevent the battery from exploding or rupturing, and effectively reduce the possibility of the battery under extreme conditions. Electrolyte can be injected into the cavity of the shell 100 through the second opening 213, and the electrolyte reacts chemically with the battery cell 300 in the cavity to generate electricity. A sealing cover 240 is provided on the second opening 213, and the second opening 213 is sealed by the sealing cover 240 to prevent leakage of electrolyte and external impurities from entering the interior of the battery.

[0090] Among them, the terms "upper" and "lower" are used to describe the relative position relationship of each structure in the accompanying drawings, which is only for the convenience of description and is not used to limit the scope of implementation of this application. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of this application without substantially changing the technical content.

[0091] It should be noted that, in this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0092] Furthermore, in this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," and the like should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0093] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover, characterized in that: include: A metal cover plate (210) and an insulating ring (220), wherein the metal cover plate (210) is connected to one end of the insulating ring (220), and the other end of the insulating ring (220) is connected to the battery housing (100); The metal cover plate (210) is used to be electrically connected to the tab (500) of the battery; A first protrusion (221), the first protrusion (221) is connected to the insulating ring (220), the first protrusion (221) is located at one end of the insulating ring (220) facing away from the metal cover plate, and the first protrusion (221) is an annular structure, and the thickness of the first protrusion (221) gradually decreases along the thickness of the metal cover plate (210) and in a direction away from the metal cover plate (210), and the first protrusion (221) is used to insulate between the tab (500) and the housing (100).

2. The battery cover according to claim 1, wherein: The annular structure of the first protrusion (221) is a conical surface, 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 battery core (300), and the first end being larger than the second end.

3. The battery cover according to claim 2, wherein: 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, wherein: 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, wherein: A groove (211) is provided on one side of the metal cover plate (210) facing the inner cavity of the housing (100), and the groove (211) is located on the outer edge of the metal cover plate (210), and the top surface of the insulating ring (220) is connected to the bottom surface of the groove (211); The inner side surface of the insulating ring (220) abuts against the groove (211).

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

7. The battery cover according to claim 6, wherein: 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, wherein: A second protrusion (231) is provided on the bottom surface of the connecting ring (230) along the length direction of the housing (100), and a side of the second protrusion (231) facing the inner cavity of the housing (100) is connected to a side of the first protrusion (221) facing away from the inner cavity of the housing (100); A side of the second protrusion (231) facing away from the inner cavity of the housing (100) is connected to a portion of the inner side wall of the housing (100); The connecting ring (230) is made of metal.

9. A battery, characterized in that: include: A housing (100), wherein the housing (100) has a cavity inside, and both ends of the housing (100) have openings communicating with the cavity; A first battery cover (201) and a second battery cover (202), the first battery cover (201) and the second battery cover (202) are respectively located at the two end openings of the housing (100), one of the first battery cover (201) and the second battery cover (202) is a battery cover according to any one of claims 1 to 5, and the other is a battery cover according to any one of claims 6 to 8; Alternatively, the first battery cover (201) and the second battery cover (202) are both battery covers according to any one of claims 6 to 8 above; A battery cell (300) is located in the cavity, and pole tabs (500) are respectively provided at both ends of the battery cell (300), and the pole tabs (500) are respectively 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) is a battery cover according to any one of claims 1 to 5, and the insulating ring (220) of the first battery cover (201) is connected to one end of the housing (100); The second battery cover (202) is the battery cover according to any one of claims 6 to 8, and the connecting ring (230) of the second battery cover (202) is connected to the other end of the housing (100).

11. The battery according to claim 10, characterized in that The invention also includes an insulating film (400), wherein the insulating film (400) is arranged on the outside of the battery core (300), and both ends of the insulating film (400) extend to the tab (500), and the battery core (300) and the housing (100) are insulated 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 the end of the insulating film (400), and the overlap amount is L, and L is between 0.1 and 4.5 mm; The first protrusion (221) is used to insulate the tab (500) from the housing (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 housing (100) is d, and d is between -0.5 and 2.0 mm.

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

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 the first opening (212) and the second opening (213) are both in communication with the cavity; The first opening (212) is provided with an explosion-proof valve; A sealing cover (240) is provided on the second opening (213), 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 to 15.

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

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