Cover plate assembly of battery cell, battery cell, battery assembly, and electric device

Abstract

A cover plate assembly of a battery cell, a battery cell, a battery assembly, and an electric device. The cover plate assembly (2000) of the battery cell (1000) comprises a cover plate body (210) and at least one explosion-proof valve (700), wherein the outer peripheral wall of the cover plate body (210) is adapted to be connected to a shell (300) of the battery cell (1000); and the at least one explosion-proof valve (700) is arranged on the cover plate body (210), and the minimum spacing between the at least one explosion-proof valve (700) and the outer peripheral wall of the cover plate body (210) ranges from 0.5 mm to 3.05 mm.

Description

Battery cell cover assembly, battery cell, battery assembly and electrical device

[0001] This application claims priority to Chinese patent application No. 202410373639.8, filed on March 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of battery technology, and in particular to a cover assembly of a battery cell, a battery cell, a battery assembly, and an electrical device. Background Art

[0003] In the battery cells of the related art, in order to ensure that the gas can be discharged smoothly when the pressure inside the battery cell is high, an explosion-proof valve is usually provided on the cover assembly of the battery cell.

[0004] Summary of the Invention

[0005] The present disclosure aims to address at least one of the technical issues in the related art. To this end, the first objective of the present disclosure is to provide a battery cell cover assembly that prevents damage to the explosion-proof valve during assembly, thereby ensuring the valve's performance. This resolves the technical issue in the related art where the cover assembly is prone to damage to the explosion-proof valve during assembly.

[0006] A second objective of the present disclosure is to provide a battery cell having the above-mentioned cap plate assembly.

[0007] A third objective of the present disclosure is to provide a battery assembly having the above-mentioned battery cell.

[0008] A fourth objective of the present disclosure is to provide an electrical device having the above-mentioned battery assembly.

[0009] According to some embodiments of the present disclosure, a battery cell cover assembly includes a cover body and at least one explosion-proof valve. The outer peripheral wall of the cover body is adapted to connect to the outer shell of the battery cell. The at least one explosion-proof valve is disposed on the cover body, and the minimum spacing between the at least one explosion-proof valve and the outer peripheral wall of the cover body is in the range of 0.5 mm to 3.05 mm.

[0010] According to the cover assembly of the battery cell in some embodiments of the present disclosure, an explosion-proof valve is provided to ensure that when the pressure inside the battery cell is high, the gas can be discharged smoothly, thereby ensuring the reliability of the battery cell and extending the service life of the battery cell; at the same time, by setting the minimum distance between the explosion-proof valve and the outer peripheral wall of the cover body to a value range of 0.5mm-3.05mm, the explosion-proof valve can be set away from the outer peripheral wall of the cover body, so as to avoid damage to the explosion-proof valve by the cover body during the connection process with the outer shell of the battery cell to a certain extent, thereby ensuring the working performance of the explosion-proof valve and extending the service life of the explosion-proof valve, thereby ensuring the working performance of the battery cell.

[0011] In some embodiments, the explosion-proof valve extends along the circumference of the cover plate body.

[0012] In some embodiments, the explosion-proof valve is formed as a long strip extending along the circumference of the cover body, the line between one end point of the explosion-proof valve and the center of the cover body is a first line, the line between the other end point of the explosion-proof valve and the center of the cover body is a second line, and the angle between the first line and the second line ranges from 10° to 225°.

[0013] In some embodiments, the explosion-proof valve is formed in an arc shape extending along the circumference of the cover body.

[0014] In some embodiments, the at least one explosion-proof valve includes a plurality of explosion-proof valves, the plurality of explosion-proof valves are spaced apart along the circumference of the cover plate body, and at least one explosion-proof valve of the plurality of explosion-proof valves extends along the circumference of the cover plate body.

[0015] In some embodiments, a first mounting hole is provided on the cover body, and the explosion-proof valve is provided in the first mounting hole.

[0016] In some embodiments, the explosion-proof valve is in an arc shape extending along the circumference of the cover plate body, and the shape of the first mounting hole is adapted to the shape of the explosion-proof valve.

[0017] In some embodiments, at least one first reinforcing rib is provided in the first mounting hole.

[0018] In some embodiments, the width of the first reinforcing rib ranges from 0.5 mm to 2.5 mm.

[0019] In some embodiments, the cover assembly further includes a pole, which is provided on the cover body, and the outer peripheral wall of the pole is connected to the cover body, and the minimum distance between the explosion-proof valve and the outer peripheral wall of the pole is in the range of 0.5mm-20mm.

[0020] In some embodiments, the cover assembly further includes an insulating spacer, which is disposed on one side of the cover body. The insulating spacer is provided with a connecting hole that is at least partially disposed opposite to the first mounting hole.

[0021] In some embodiments, at least one second reinforcing rib is provided in the communicating hole.

[0022] In some embodiments, the width of the second reinforcing rib ranges from 0.3 mm to 2 mm.

[0023] In some embodiments, at least one abutting boss is provided on a first surface of the insulating spacer facing away from the cover body. The at least one abutting boss is disposed adjacent to the communicating hole, and the abutting boss is adapted to abut against the current collecting plate.

[0024] In some embodiments, the stop boss satisfies at least one of the following: the height of the stop boss is in the range of 0.5 mm to 2 mm; or the side of the stop boss away from the insulating spacer has a stop surface, the stop surface abuts against the collecting plate, and the area S of the stop surface is ≥ 1.5 mm 2 .

[0025] In some embodiments, the at least one abutting boss includes a plurality of abutting bosses, the plurality of abutting bosses are spaced apart, and a distance between two adjacent abutting bosses on the same side of the communicating hole is L, 0mm<L≤6.5mm.

[0026] In some embodiments, an outer peripheral edge of the first surface of the insulating spacer facing away from the cover body is provided with an outer edge protrusion, and the outer edge protrusion is provided with an escape opening for avoiding the collecting plate.

[0027] According to some embodiments of the present disclosure, a battery cell includes a housing and a cover assembly, wherein the cover assembly is disposed on the housing, and the cover body is the aforementioned cover assembly.

[0028] According to the battery cells of some embodiments of the present disclosure, by adopting the aforementioned cover plate assembly, the working performance of the explosion-proof valve can be effectively guaranteed, thereby improving the working performance of the battery cell and ensuring the reliability of the battery cell.

[0029] In some embodiments, the explosion-proof valve is in an arc shape extending along the circumference of the cover plate body, and the center of the explosion-proof valve coincides with the geometric center of the battery cell.

[0030] In some embodiments, the battery cells are cylindrical batteries.

[0031] A battery assembly according to some embodiments of the present disclosure includes a plurality of the aforementioned battery cells.

[0032] According to the battery assembly of some embodiments of the present disclosure, the aforementioned battery cells are adopted to improve the working performance of the battery assembly and ensure the reliability of the battery assembly.

[0033] According to some embodiments of the present disclosure, an electrical device includes the aforementioned battery assembly.

[0034] According to some embodiments of the present disclosure, the electrical device adopts the aforementioned battery assembly to improve the working performance of the electrical device and ensure the reliability of the electrical device.

[0035] Additional aspects and advantages of the present disclosure will become apparent from the following description or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0037] FIG1 is an exploded view of a positive electrode cover plate assembly and a positive electrode current collecting disc according to some embodiments of the present disclosure, wherein the positive electrode current collecting disc is in an unfolded state.

[0038] FIG2 is a schematic diagram of a positive electrode cover plate assembly and a positive electrode current collecting disc according to some embodiments of the present disclosure, wherein the positive electrode current collecting disc is in an unfolded state.

[0039] 3 is a top view of a positive electrode cover plate assembly and a positive electrode current collecting disc according to some embodiments of the present disclosure, wherein the positive electrode current collecting disc is in an unfolded state.

[0040] FIG4 is a top view of a positive electrode cover plate assembly and a positive electrode current collecting disc according to other embodiments of the present disclosure, wherein the positive electrode current collecting disc is in an unfolded state.

[0041] 5 is a top view of a negative electrode cover plate assembly and a negative electrode current collecting disc according to some embodiments of the present disclosure, wherein the negative electrode current collecting disc is in an unfolded state.

[0042] FIG6 is a top view of a negative electrode cover plate assembly and a negative electrode current collecting disc according to other embodiments of the present disclosure, wherein the negative electrode current collecting disc is in an unfolded state.

[0043] FIG. 7 is a schematic diagram of an insulating spacer according to some embodiments of the present disclosure.

[0044] 8 is a bottom view of the cover plate assembly and the current collecting tray according to some embodiments of the present disclosure, wherein the current collecting tray is in an unfolded state.

[0045] FIG9 is a schematic diagram of a positive electrode cover plate assembly and a positive electrode current collecting disc according to some embodiments of the present disclosure, wherein the positive electrode current collecting disc is in a folded state.

[0046] FIG10 is a schematic diagram of a positive electrode cover plate assembly and a positive electrode current collecting plate according to some embodiments of the present disclosure, wherein the positive electrode current collecting plate is in a folded state.

[0047] FIG. 11 is an exploded view of a battery cell according to some embodiments of the present disclosure.

[0048] FIG. 12 is a schematic diagram of a positive electrode current collecting disc when it is unfolded according to some embodiments of the present disclosure.

[0049] 13 is a block diagram of a battery assembly according to some embodiments.

[0050] FIG14 is a block diagram of a powered device according to some embodiments.

[0051] Reference numerals:

[0052] 1000, battery cell; 100, positive electrode current collector; 101, negative electrode current collector; 110, first connecting portion; 120, second connecting portion; 121, connecting area; 1211, opposite sidewall; 1212, weld line; 1213, weld spot; 122, identification area; 123, avoidance portion; 130, middle portion; 200, cover plate assembly; 210, cover plate body; 211, injection channel; 212, second mounting hole; 213, first mounting hole; 214, first reinforcing rib; 250, pole; 251, first limiting portion; 252, second limiting portion; 270, insulating spacer; 271, avoidance hole; 272, connecting hole; 273, second reinforcing rib; 274, stop boss; 275, outer edge protrusion; 2751, avoidance port; 2 76. Liquid injection hole; 240. Boss; 280. Positive electrode cover plate assembly; 290. Negative electrode cover plate assembly; 400. Insulator; 430. Insulator sheet; 440. Sealing ring; 500. Buffer; 600. Sealing piece; 700. Explosion-proof valve; 800. Protective sheet; 300. Casing; 320. Electrode core; 2000. Battery assembly; 3000. Electrical device; 4000. Collecting plate; 5000. Stop surface. DETAILED DESCRIPTION

[0053] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

[0054] The cap plate assembly 200 of the battery cell 1000 according to some embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0055] During the assembly process of the cover plate assembly in the related art, the explosion-proof valve is easily damaged, which shortens the service life of the explosion-proof valve and reduces the working performance of the explosion-proof valve.

[0056] As shown in FIG. 1 and FIG. 11 , the cap plate assembly 200 of the battery cell 1000 according to some embodiments of the present disclosure includes a cap plate body 210 and an explosion-proof valve 700 .

[0057] 1 and 11 , the outer peripheral wall of the cover body 210 is adapted to be connected to the outer shell 300 of the battery cell 1000 , so as to facilitate the use of the cover body 210 to block the opening of the outer shell 300 and reduce the difficulty of connecting the cover body 210 and the outer shell 300 .

[0058] As shown in Figures 1, 2, and 3, the explosion-proof valve 700 is provided on the cover body 210, and the minimum spacing between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 ranges from 0.5 mm to 3.05 mm. This means that the explosion-proof valve 700 is provided on the cover body 210 and is spaced apart from the outer peripheral wall of the cover body 210. There are multiple distances between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210, and the minimum distance ranges from 0.5 mm to 3.05 mm.

[0059] In some embodiments, the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 refers to the minimum value of the distance between the outer edge of the explosion-proof valve 700 facing the outer peripheral wall of the cover body 210 and the corresponding outer peripheral wall of the cover body 210, which is L1 shown in Figure 3.

[0060] It should be noted that the explosion-proof valve 700 is mainly used to rupture when the internal pressure of the battery cell 1000 is relatively high, so that the pressure inside the battery cell 1000 can be discharged through the explosion-proof valve 700, thereby improving the reliability of the battery cell 1000. By arranging the explosion-proof valve 700 on the cover body 210, it is convenient to use the cover body 210 to support the explosion-proof valve 700, thereby improving the position stability of the explosion-proof valve 700, which is conducive to ensuring the working performance of the explosion-proof valve 700 and reducing the difficulty of assembling the explosion-proof valve 700 and the cover body 210.

[0061] In some embodiments, the explosion-proof valve 700 is welded to the cover body 210 to achieve a fixed connection between the explosion-proof valve 700 and the cover body 210, and to ensure the connection strength between the explosion-proof valve 700 and the cover body 210, thereby facilitating the use of the cover body 210 to support the explosion-proof valve 700 and improving the positional stability of the explosion-proof valve 700.

[0062] It should be noted that during the assembly process of the battery cell 1000, the cover body 210 needs to be installed on the outer shell 300 (as shown in Figure 11), and the cover body 210 and the outer shell 300 are connected by welding. However, stress will be generated during the welding process. At this time, the explosion-proof valve 700 provided on the cover body 210 will be subjected to a pulling force toward the side of the outer shell 300, which will cause the explosion-proof valve 700 to be easily deformed and cracked, shortening the service life of the explosion-proof valve 700 and affecting the working performance of the explosion-proof valve 700.

[0063] Therefore, some embodiments of the present disclosure set the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 apart, and set the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 to a range of 0.5mm-3.05mm, so that the explosion-proof valve 700 can have a certain distance from the outer peripheral wall of the cover body 210.

[0064] As shown in Table 1, when the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 is less than 0.5 mm, the deformation of the explosion-proof valve 700 increases, which makes the explosion-proof valve 700 easy to deform and crack, shortens the service life of the explosion-proof valve 700, and affects the working performance of the explosion-proof valve 700; when the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 is greater than 3.05 mm, it has little effect on the deformation of the explosion-proof valve 700 and the detonation pressure, but because the explosion-proof valve 700 is located on the cover body On the body 210, if the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 is greater than 3.05 mm, the explosion-proof valve 700 will be set close to the center of the cover body 210. On the one hand, it is not conducive to the arrangement of other structural parts (such as the pole 250 mentioned below) on the cover body 210. On the other hand, when the explosion-proof valve 700 needs to be arranged to extend along the circumference of the cover body 210, it is not conducive to the arrangement of the explosion-proof valve 700 with a longer extension length, which affects the pressure relief performance of the explosion-proof valve 700.

[0065] Table 1

[0066] Therefore, some embodiments of the present disclosure set the minimum distance between the explosion-proof valve 700 and the outer wall of the cover body 210 to a range of 0.5mm-3.05mm. In this way, it not only avoids the cover body 210 and the outer shell 300 from affecting the explosion-proof valve 700 during welding to a certain extent, thereby avoiding deformation and cracking of the explosion-proof valve 700 and ensuring the working performance of the explosion-proof valve 700, but also facilitates the arrangement of the pole 250 on the cover body 210 and ensures the extended length of the explosion-proof valve 700.

[0067] In some embodiments, the explosion-proof valve 700 is made of aluminum and can be formed by a stamping process; or, laser notches are set on the explosion-proof valve 700 to ensure that the explosion-proof valve 700 can effectively rupture when the internal pressure of the battery cell 1000 is high, thereby improving the reliability of the battery cell 1000.

[0068] Of course, in some other embodiments, the explosion-proof valve 700 may also be made of steel or other materials.

[0069] As can be seen from the above structure, the cover assembly 200 of the battery cell 1000 in some embodiments of the present disclosure reduces the difficulty of installing the explosion-proof valve 700 by arranging the explosion-proof valve 700 on the cover body 210, and ensures that when the internal pressure of the battery cell 1000 is large, the pressure can be discharged smoothly, thereby improving the reliability of the battery cell 1000.

[0070] In addition, the position of the explosion-proof valve 700 is set so that the minimum distance between the explosion-proof valve 700 and the outer wall of the cover body 210 is in the range of 0.5mm-3.05mm. In this way, the cover body 210 and the shell 300 can be prevented from affecting the explosion-proof valve 700 during welding to a certain extent, thereby preventing the explosion-proof valve 700 from being deformed and cracked to a certain extent, thereby ensuring the working performance of the explosion-proof valve 700.

[0071] It can be understood that compared with the related art, some embodiments of the present disclosure set an explosion-proof valve 700 on the cover body 210 and limit the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210, so as to avoid deformation and cracking of the explosion-proof valve 700 during the assembly process of the cover assembly 200 to a certain extent, thereby ensuring the working performance of the explosion-proof valve 700 and extending the service life of the explosion-proof valve 700.

[0072] In some embodiments, the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the cover body 210 is 0.5 mm, 0.72 mm, 0.88 mm, 1 mm, 1.2 mm, 1.4 mm, 1.8 mm, 2.2 mm, 2.6 mm or 3.05 mm, etc.

[0073] In some embodiments, as shown in Figures 1, 2, and 3, the cover assembly 200 includes a pole 250, which is provided on the cover body 210. The outer peripheral wall of the pole 250 is connected to the cover body 210, and the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the pole 250 is in the range of 0.5 mm to 20 mm. This means that the pole 250 is provided on the cover body 210 and the explosion-proof valve 700 is spaced apart from the outer peripheral wall of the pole 250. There are multiple distances between the explosion-proof valve 700 and the outer peripheral wall of the pole 250, and the minimum distance is in the range of 0.5 mm to 20 mm.

[0074] In some embodiments, the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the pole 250 refers to the minimum distance between the outer edge of the outer peripheral wall of the explosion-proof valve 700 facing the pole 250 and the outer peripheral wall of the corresponding pole 250, that is, L2 shown in Figure 3.

[0075] It should be noted that the pole 250 is mainly used to electrically connect with the pole core 320 of the battery cell 1000, so as to facilitate the extraction of current from the pole core 320 and ensure the working performance of the pole core 320, that is, to ensure the working performance of the battery cell 1000. By arranging the pole 250 on the cover body 210, it is convenient to use the cover body 210 to support the pole 250, improve the position stability of the pole 250, which is conducive to ensuring the working performance of the pole 250 and reducing the difficulty of assembling the pole 250 and the cover body 210.

[0076] It should be noted that, during the assembly of the battery cell 1000, as shown in Figures 2 and 3, the pole 250 needs to be installed on the cover body 210 (, and the pole 250 and the cover body 210 are connected by welding. However, stress is also generated during the welding process, causing the explosion-proof valve 700 on the cover body 210 to be subjected to a pulling force toward the pole 250 side, thereby causing the explosion-proof valve 700 to be easily deformed and cracked, shortening the service life of the explosion-proof valve 700, and affecting the working performance of the explosion-proof valve 700.

[0077] Therefore, some embodiments of the present disclosure set the minimum spacing between the explosion-proof valve 700 and the outer peripheral wall of the pole 250 to a range of 0.5mm-20mm, so that the explosion-proof valve 700 can have a predetermined distance from the outer peripheral wall of the pole 250, thereby avoiding to a certain extent the impact of the explosion-proof valve 700 when the pole 250 is welded to the cover body 210, avoiding deformation and cracking of the explosion-proof valve 700, and further ensuring the working performance of the explosion-proof valve 700.

[0078] In some embodiments, the minimum distance between the explosion-proof valve 700 and the outer peripheral wall of the pole 250 is 0.5 mm, 1 mm, 5 mm, 10 mm, 15 mm, or 20 mm.

[0079] In some embodiments, in combination with Figures 1, 2 and 3, the cover assembly 200 also includes a protective sheet 800, which is provided on the cover body 210 and located on the outside of the explosion-proof valve 700. The protective sheet 800 is used to protect the explosion-proof valve 700 to prevent external foreign matter from falling into the explosion-proof valve 700 and causing the explosion-proof valve 700 to deform and crack, thereby ensuring the working performance of the explosion-proof valve 700.

[0080] In some embodiments, as shown in Figures 1, 2, and 3, the explosion-proof valve 700 extends along the circumference of the cover plate body 210. This ensures that the extension area of ​​the explosion-proof valve 700 is sufficient, thereby ensuring that the exhaust area of ​​the cover plate body 210 is sufficient when the explosion-proof valve 700 ruptures. This ensures that when the internal pressure of the battery cell 1000 is high, the gas in the battery cell 1000 can be smoothly and largely discharged through the explosion-proof valve 700, thereby improving the reliability of the battery cell 1000.

[0081] Furthermore, the above configuration can also increase the detonation area of ​​the explosion-proof valve 700, thereby preventing the pressure relief area of ​​the explosion-proof valve 700 from failing to meet the design value and ensuring the stability of the detonation pressure of the explosion-proof valve 700.

[0082] In some embodiments, as shown in Figures 1, 2 and 3, the explosion-proof valve 700 is arranged on the outer periphery of the pole 250 and extends along the circumference of the cover body 210. In this way, while ensuring that the pole 250 and the explosion-proof valve 700 can both be arranged on the cover body 210, the extension area of ​​the explosion-proof valve 700 can also be guaranteed, thereby ensuring the stability of the detonation pressure of the explosion-proof valve 700.

[0083] In some embodiments, as shown in Figures 1 and 3, the explosion-proof valve 700 is formed as a long strip extending along the circumference of the cover body 210, and the line between one of the end points of the explosion-proof valve 700 and the center of the cover body 210 is the first line, and the line between the other end point of the explosion-proof valve 700 and the center of the cover body 210 is the second line, and the angle between the first line and the second line ranges from 10° to 225°. For example, the angle between the first connecting line and the second connecting line can be understood as a shown in Figure 3. When the angle between the first connecting line and the second connecting line is less than 10°, the extension area of ​​the explosion-proof valve 700 will be reduced, resulting in a smaller exhaust area of ​​the cover body 210, which is not conducive to exhaust and pressure relief, and affects the reliability of the battery cell 1000; when the angle between the first connecting line and the second connecting line is greater than 225°, the molding difficulty of the explosion-proof valve 700 will be increased, and the structural strength of the cover body 210 will be reduced, resulting in the explosion-proof valve 700 being easy to deform, which will also increase the difficulty of welding the explosion-proof valve 700.

[0084] Therefore, some embodiments of the present disclosure set the value range of the angle between the first connecting line and the second connecting line to 10°-225°. In this way, while ensuring the extension area of ​​the explosion-proof valve 700, the molding difficulty of the explosion-proof valve 700 can be reduced, and the structural strength of the cover plate body 210 can be improved, thereby reducing the welding difficulty of the explosion-proof valve 700 and the cover plate body 210, so that the explosion-proof valve 700 can be stably arranged on the cover plate body 210, thereby improving the reliability of the battery cell 1000.

[0085] In some embodiments, the angle between the first connecting line and the second connecting line is 10°, 50°, 100°, 150°, 200°, or 225°.

[0086] In some embodiments, as shown in FIG1 and FIG3 , the explosion-proof valve 700 is formed in an arc shape extending along the circumference of the cover body 210. This allows the shape of the explosion-proof valve 700 to match the shape of the cover body 210, thereby ensuring that the explosion-proof valve 700 extending along the circumference of the cover body 210 has a sufficient extension area to ensure the working performance of the explosion-proof valve 700.

[0087] In some embodiments, the central angle of the arc-shaped explosion-proof valve 700 ranges from 10° to 225°, so that the angle between the first connecting line and the second connecting line ranges from 10° to 225°.

[0088] In some other embodiments, the central angle of the arc-shaped explosion-proof valve 700 is 360°. In other words, the central angle of the arc-shaped explosion-proof valve 700 is not limited to being set within a range of 10°-225°. The central angle of the arc-shaped explosion-proof valve 700 can also be set to 360°. This can maximize the exhaust area of ​​the cover body 210 when the arc-shaped explosion-proof valve 700 ruptures.

[0089] Moreover, when the central angle of the arc-shaped explosion-proof valve 700 is 360°, the arc-shaped explosion-proof valve 700 can be formed into a complete circle structure around the circumference of the cover body 210, which is also conducive to reducing the difficulty of forming the arc-shaped explosion-proof valve 700.

[0090] It should be noted that the center of the arc-shaped explosion-proof valve 700 may coincide with the center of the cover body 210 or may not coincide with the center of the cover body 210 , and this disclosure does not impose any limitation thereto.

[0091] In some embodiments, the center of the arc-shaped explosion-proof valve 700 coincides with the center of the cover body 210 , which helps to ensure the extended length of the explosion-proof valve 700 and thus ensure the area of ​​the explosion-proof valve 700 .

[0092] In some embodiments, the cover body 210 is provided with a plurality of explosion-proof valves 700, which are spaced apart along the circumference of the cover body 210, and at least one of the plurality of explosion-proof valves 700 extends along the circumference of the cover body 210. This ensures that the exhaust area of ​​the cover body 210 as a whole is maintained while reducing the extension area of ​​each explosion-proof valve 700, thereby reducing the difficulty of connecting the explosion-proof valve 700 to the cover body 210 and ensuring the quality of the connection, so that the explosion-proof valve 700 can be stably installed on the cover body 210.

[0093] That is to say, some embodiments of the present disclosure provide multiple explosion-proof valves 700 on the cover body 210. The multiple explosion-proof valves 700 cooperate to ensure the exhaust area of ​​the cover body 210 while also ensuring the connection quality between the explosion-proof valves 700 and the cover body 210.

[0094] In the description of the present disclosure, unless otherwise specified, “plurality” means two or more.

[0095] In some embodiments, two explosion-proof valves 700 are provided on the cover body 210. The two explosion-proof valves 700 are arranged at intervals along the circumference of the cover body 210 and extend along the circumference of the cover body 210 to form arc-shaped holes. The two explosion-proof valves 700 are symmetrically arranged on the cover body 210. In this way, while ensuring the uniformity of exhaust, the exhaust area of ​​the cover body 210 can also be ensured, which is beneficial to discharge the pressure in the battery cell 1000, thereby improving the reliability of the battery cell 1000.

[0096] It should be noted that when multiple explosion-proof valves 700 are provided on the cover body 210, multiple protection sheets 800 can be provided on the cover body 210 accordingly. Therefore, the shape and number of the protection sheets 800 shown in Figures 2 to 6 can be understood as the shape and number of the explosion-proof valves 700.

[0097] In some embodiments, as shown in Figures 2, 3 and 5, an explosion-proof valve 700 is provided on the cover body 210. The explosion-proof valve 700 is provided on the outer periphery of the pole 250 and extends along the circumference of the cover body 210 to form an arc-shaped hole, thereby ensuring the extension area of ​​the explosion-proof valve 700, increasing the exhaust area of ​​the cover body 210, and improving the reliability of the battery cell 1000.

[0098] As shown in Figure 4, two explosion-proof valves 700 are provided on the cover body 210. The two explosion-proof valves 700 are arranged at intervals along the circumference of the cover body 210 and extend along the circumference of the cover body 210 to form an arc-shaped hole. The two explosion-proof valves 700 are symmetrically arranged relative to the pole 250 to ensure the uniformity of the exhaust of the cover body 210, and can ensure the exhaust area of ​​the cover body 210 and reduce the difficulty of forming the explosion-proof valve 700.

[0099] As shown in Figure 6, an explosion-proof valve 700 is provided on the cover body 210, and the central angle of the explosion-proof valve 700 is 360°, so that the explosion-proof valve 700 forms a full circle structure around the circumference of the cover body 210, so as to maximize the exhaust area of ​​the cover body 210 and reduce the difficulty of forming the explosion-proof valve 700.

[0100] It should be noted that FIG. 1 to FIG. 6 all show that the explosion-proof valve 700 is formed as an arc-shaped explosion-proof valve. Of course, in some other embodiments, the explosion-proof valve 700 may also be formed as a circular explosion-proof valve, an elliptical explosion-proof valve, etc.

[0101] 1 , the cover body 210 is provided with a first mounting hole 213, and the explosion-proof valve 700 is provided in the first mounting hole 213. In this way, the explosion-proof valve 700 can be provided on the cover body 210, and the difficulty of connecting the explosion-proof valve 700 to the cover body 210 is reduced.

[0102] In some embodiments, as shown in Figure 1, the explosion-proof valve 700 is in the shape of an arc extending along the circumference of the cover body 210, and the shape of the first mounting hole 213 is adapted to the shape of the explosion-proof valve 700. That is, the first mounting hole 213 is an arc-shaped hole extending along the circumference of the cover body 210, thereby facilitating the placement of the explosion-proof valve 700 in the first mounting hole 213 and reducing the difficulty of assembling the explosion-proof valve 700 and the first mounting hole 213.

[0103] In some embodiments, as shown in FIG1 , the first mounting hole 213 is a runway-shaped arc-shaped hole extending along the circumference of the cover plate body 210. This ensures that the opening size of the first mounting hole 213 is sufficient, thereby ensuring the area of ​​the explosion-proof valve 700 disposed within the first mounting hole 213 and the exhaust area of ​​the cover plate body 210 when the explosion-proof valve 700 ruptures. This ensures that when the internal pressure of the battery cell 1000 is high, the gas within the battery cell 1000 can be smoothly and largely discharged through the explosion-proof valve 700, thereby improving the reliability of the battery cell 1000.

[0104] In some embodiments, as shown in FIG1 , the cover body 210 is provided with a second mounting hole 212, and the pole 250 is provided in the second mounting hole 212. In this way, the pole 250 can be provided on the cover body 210, thereby achieving a fixed connection between the pole 250 and the cover body 210, facilitating the use of the cover body 210 to support the pole 250, improving the positional stability of the pole 250, facilitating the working performance of the pole 250, and reducing the difficulty of assembling the pole 250 and the cover body 210.

[0105] In the description of the present disclosure, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0106] In some embodiments, as shown in Figure 1, the pole 250 has a first limiting portion 251 located on one side of the cover body 210 and a second limiting portion 252 located on the other side of the cover body 210. The first limiting portion 251 and the second limiting portion 252 are arranged on opposite sides of the cover body 210. In this way, when the pole 250 is set in the second mounting hole 212, the first limiting portion 251 and the second limiting portion 252 can be used to cooperate to fix the pole 250 on the cover body 210, thereby facilitating the use of the cover body 210 to support the pole 250 and improve the positional stability of the pole 250. In addition, it is also beneficial to use the pole 250 to lead the current of the pole core 320.

[0107] In some embodiments, the pole 250 is formed by piercing, so that the first limiting portion 251 and the second limiting portion 252 of the pole 250 are respectively arranged on opposite sides of the cover body 210 .

[0108] In some embodiments, the pole 250 is made of aluminum, which is connected to a current collecting plate. The current collecting plate is suitable for connecting to the pole core 320, thereby achieving electrical connection between the pole 250 and the pole core 320, making it easier to use the pole 250 to draw out the current of the pole core 320.

[0109] The current collecting disk mentioned here can be understood as the positive electrode current collecting disk 100 hereinafter. The structure of the positive electrode current collecting disk 100 can be seen in FIG1 .

[0110] In some embodiments, as shown in FIG1 , at least one first reinforcing rib 214 is provided in the first mounting hole 213. The first reinforcing rib 214 is used to increase the structural strength of the first mounting hole 213 and prevent deformation of the first mounting hole 213 due to its large extended area, thereby reducing the difficulty of connecting the explosion-proof valve 700 to the first mounting hole 213 and ensuring the quality of the connection between the explosion-proof valve 700 and the first mounting hole 213, ensuring that the explosion-proof valve 700 can be stably installed in the first mounting hole 213, improving the positional stability of the explosion-proof valve 700, and thus ensuring the working performance of the explosion-proof valve 700.

[0111] In some embodiments, as shown in Figure 1, at least one first reinforcing rib 214 includes multiple first reinforcing ribs 214, and the multiple first reinforcing ribs 214 are arranged at intervals in the extension direction of the first mounting hole 213, so as to maximize the structural strength of the first mounting hole 213 by utilizing the multiple first reinforcing ribs 214, thereby avoiding deformation of the first mounting hole 213.

[0112] In some embodiments, the width of the first reinforcing rib 214 ranges from 0.5 mm to 2.5 mm. The width of the first reinforcing rib 214 mentioned here can be understood as W1 shown in FIG1 . When the width of the first reinforcing rib 214 is less than 0.5 mm, on the one hand, the manufacturing difficulty of the first reinforcing rib 214 will increase, and on the other hand, the reinforcement quality of the first reinforcing rib 214 will be reduced, resulting in the risk of deformation of the first mounting hole 213. When the width of the first reinforcing rib 214 is greater than 2.5 mm, on the one hand, the manufacturing cost of the first reinforcing rib 214 will increase, and on the other hand, the exhaust area of ​​the first mounting hole 213 will be reduced, thereby affecting the pressure relief effect of the first mounting hole 213.

[0113] Therefore, some embodiments of the present disclosure set the width range of the first reinforcing rib 214 to 0.5mm-2.5mm. In this way, the manufacturing difficulty of the first reinforcing rib 214 can be reduced, and while ensuring the reinforcement quality of the first reinforcing rib 214, the manufacturing cost of the first reinforcing rib 214 can be reduced, and the exhaust area of ​​the first mounting hole 213 can be ensured, thereby improving the pressure relief effect of the first mounting hole 213.

[0114] In some embodiments, the width of the first reinforcing rib 214 is 0.5 mm, 1.0 mm, 1.5 mm, 2 mm, or 2.5 mm.

[0115] It should be noted that the first reinforcing ribs 214 are not limited to the radial vertical bars shown in FIG. 1 , and any reinforcing shape is acceptable, and no specific limitation is made here.

[0116] In some embodiments, as shown in FIG1 , the cover plate assembly 200 further includes an insulating spacer 270 disposed on one side of the cover plate body 210. The insulating spacer 270 includes a communication hole 272 disposed at least partially opposite the first mounting hole 213. By disposing the insulating spacer 270 on one side of the cover plate body 210, the insulating spacer 270 can be used to provide insulation between the pole 250 and the cover plate body 210. Furthermore, the insulating spacer 270 can also be used to protect the explosion-proof valve 700, preventing the pole core 320 from damaging the explosion-proof valve 700, thereby ensuring the performance of the explosion-proof valve 700.

[0117] Furthermore, by providing the communicating hole 272 on the insulating spacer 270 , which is at least partially opposite to the first mounting hole 213 , the insulating spacer 270 can be prevented from obstructing the exhaust and pressure relief of the first mounting hole 213 , thereby ensuring the working performance of the battery cell 1000 .

[0118] In some embodiments, as shown in FIG1 , the insulating spacer 270 is further provided with an avoidance hole 271 facing the second mounting hole 212 to prevent the insulating spacer 270 from obstructing the installation of the pole 250 , thereby reducing the difficulty of installing the pole 250 and ensuring the assembly efficiency of the battery cell 1000 .

[0119] In some embodiments, the insulating isolator 270 is made of polypropylene and is disposed on the other side of the cover body 210, and part of the structure of the insulating isolator 270 is located between the second limiting portion 252 of the pole 250 and the cover body 210 to achieve insulating cooperation between the pole 250 and the cover body 210.

[0120] In some embodiments, as shown in FIG1 , at least one second reinforcing rib 273 is provided in the communication hole 272. The second reinforcing rib 273 is used to improve the structural strength of the communication hole 272 and prevent deformation of the communication hole 272 due to its large extension area, thereby ensuring the structural strength of the insulating spacer 270 and improving the working performance of the insulating spacer 270. Furthermore, the second reinforcing rib 273 can prevent structural components (e.g., the positive electrode current collecting disc 100, the negative electrode current collecting disc 101, etc.) located on one side of the insulating spacer 270 from contacting the explosion-proof valve 700 through the communication hole 272 and causing damage to the explosion-proof valve 700. This ensures that when the gas in the battery cell 1000 experiences thermal runaway, the gas can effectively dislodge the explosion-proof valve 700, allowing the explosion-proof valve 700 to open smoothly and improving the reliability of the battery cell 1000.

[0121] In some embodiments, as shown in Figure 1, at least one second reinforcing rib 273 includes multiple second reinforcing ribs 273, and the multiple second reinforcing ribs 273 are arranged at intervals in the extension direction of the connecting hole 272, so as to maximize the structural strength of the connecting hole 272 by utilizing the multiple second reinforcing ribs 273 to avoid deformation of the connecting hole 272, and effectively avoid the structural parts located on one side of the insulating isolation member 270 from contacting the explosion-proof valve 700 through the connecting hole 272 to cause damage to the explosion-proof valve 700, thereby ensuring the working performance of the explosion-proof valve 700.

[0122] In some embodiments, the width of the second reinforcing rib 273 ranges from 0.3 mm to 2 mm. The width of the second reinforcing rib 273 mentioned here can be understood as W2 shown in Figure 1. When the width of the second reinforcing rib 273 is less than 0.3 mm, on the one hand, the manufacturing difficulty of the second reinforcing rib 273 will increase, and on the other hand, the reinforcement quality of the second reinforcing rib 273 will be reduced, so that there is a risk that the structural member on one side of the insulating spacer 270 contacts the explosion-proof valve 700 through the connecting hole 272 and damages the explosion-proof valve 700; when the width of the second reinforcing rib 273 is greater than 2 mm, on the one hand, the manufacturing cost of the second reinforcing rib 273 will increase, and on the other hand, the exhaust area of ​​the connecting hole 272 will be reduced, thereby affecting the pressure relief effect of the connecting hole 272.

[0123] Therefore, some embodiments of the present disclosure set the width range of the second reinforcing rib 273 to 0.3mm-2mm. This can reduce the manufacturing difficulty of the second reinforcing rib 273, ensure the reinforcement quality of the second reinforcing rib 273, reduce the manufacturing cost of the second reinforcing rib 273, and ensure the exhaust area of ​​the connecting hole 272, thereby improving the pressure relief effect of the connecting hole 272.

[0124] In some embodiments, the width of the second reinforcing rib 273 is 0.3 mm, 0.5 mm, 1.0 mm, 1.5 mm, or 2 mm.

[0125] It should be noted that the second reinforcing ribs 273 are not limited to the radial vertical bars shown in FIG. 1 , and any reinforcing shape is acceptable, and no specific limitation is made here.

[0126] In some embodiments, as shown in Figures 7, 8 and 9, the first surface of the insulating isolation member 270 facing away from the cover body 210 is provided with at least one stop boss 274, and the stop boss 274 is arranged adjacent to the connecting hole 272, and the stop boss 274 is suitable for stopping the collecting plate. What is meant here is that the insulating isolation member 270 has a first surface facing away from the cover plate body 210, and a stop boss 274 is provided on the first surface, and the stop boss 274 is arranged adjacent to the connecting hole 272. In this way, the stop boss 274 can be used to support the collecting plate 4000 (positive collecting plate 100 or negative collecting plate 101) located on the side of the first surface of the insulating isolation member 270, to prevent the collecting plate located on the side of the first surface of the insulating isolation member 270 from blocking the connecting hole 272, thereby preventing the connecting hole 272 from being blocked and causing the inability to exhaust and relieve pressure. In this way, when the gas in the battery cell 1000 is thermally runaway, the gas can effectively rush open the explosion-proof valve 700, so that the explosion-proof valve 700 can be opened smoothly, thereby improving the reliability of the battery cell 1000.

[0127] In some embodiments, the height of the stop boss 274 ranges from 0.5 mm to 2 mm. The height of the stop boss 274 mentioned here can be understood as H shown in FIG7 . When the height of the stop boss 274 is less than 0.5 mm, the collecting plate located on the first surface side of the insulating spacer 270 is likely to block the connecting hole 272, affecting the pressure relief effect of the connecting hole 272. When the height of the stop boss 274 is greater than 2 mm, on the one hand, the manufacturing cost of the stop boss 274 will increase, and on the other hand, the height of the battery cell 1000 will increase, which increases the difficulty of assembling the battery cell 1000.

[0128] Therefore, some embodiments of the present disclosure set the height range of the stop boss 274 to 0.5mm-2mm. In this way, while avoiding the current collecting plate located on the first surface side of the insulating isolation member 270 from blocking the connecting hole 272, it can also reduce the manufacturing cost of the stop boss 274, reduce the height of the battery cell 1000, and reduce the difficulty of assembling the battery cell 1000.

[0129] In some embodiments, the height of the abutment boss 274 is 0.5 mm, 1.0 mm, 1.5 mm, or 2 mm.

[0130] Optionally, the side of the stop boss 274 away from the insulating spacer 270 has a stop surface 5000, the stop surface 5000 stops at the collecting plate, and the area S of the stop surface 5000 is ≥ 1.5 mm 2 It can be understood here that the stop boss 274 has a stop surface 5000 away from the insulating isolation member 270, and the stop surface 5000 abuts against the current collecting disk, thereby realizing the abutment fit between the stop boss 274 and the current collecting disk, thereby facilitating the use of the stop boss 274 to support the current collecting disk and preventing the current collecting disk from blocking the connecting hole 272.

[0131] Furthermore, the area S of the abutment surface is set to be greater than or equal to 1.5 mm. 2 , which can ensure the contact area between the stop boss 274 and the collecting plate, avoid damage to the collecting plate due to the small area of ​​the stop surface of the stop boss 274, thereby ensuring the working performance of the collecting plate.

[0132] In some embodiments, in combination with Figures 7, 8 and 9, at least one stop boss 274 includes multiple stop bosses 274, and the multiple stop bosses 274 are arranged at intervals. The distance between two adjacent stop bosses 274 located on the same side of the connecting hole 272 is L, for example, 0mm<L≤6.5mm. In this way, by setting a plurality of stop bosses 274, it is possible to effectively support the structural parts located on the first surface side of the insulating isolation member 270, thereby preventing the structural parts located on the first surface side of the insulating isolation member 270 from blocking the connecting hole 272; by setting the distance L between two adjacent stop bosses 274 located on the same side of the connecting hole 272 to be greater than 0 mm and less than or equal to 6.5 mm, while ensuring that a larger number of stop bosses 274 can be set at the position adjacent to the connecting hole 272, an exhaust channel can also be formed between the two adjacent stop bosses 274 located on the same side of the connecting hole 272, thereby ensuring that when the gas in the battery cell 1000 thermally runs away, the gas can effectively rush open the explosion-proof valve 700, so that the explosion-proof valve 700 can be opened smoothly, thereby improving the reliability of the battery cell 1000.

[0133] In some embodiments, the distance between two adjacent abutment bosses 274 located on the same side of the communicating hole 272 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or 6.5 mm.

[0134] In some embodiments, as shown in Figures 7, 8, 9, and 10, an outer edge protrusion 275 is provided on the outer periphery of the first surface of the insulating spacer 270 facing away from the cover body 210. The outer edge protrusion 275 is provided with a clearance opening 2751 for circumventing the current collecting tray. Thus, by providing the outer edge protrusion 275, the current collecting tray can be prevented from radially extending out of the insulating spacer 270 after folding, thereby preventing the current collecting tray from forming an electrical connection with other structural components (e.g., the housing 300), thereby ensuring the operating performance of the battery cell 1000. By providing the clearance opening 2751 for circumventing the current collecting tray on the outer edge protrusion 275, the unfolded current collecting tray can be installed on the cover body 210 (as shown in Figure 8), thereby reducing the difficulty of assembling the current collecting tray.

[0135] In addition, the avoidance opening 2751 can also prevent the outer edge protrusion 275 from damaging the collecting plate, thereby extending the service life of the collecting plate.

[0136] In some embodiments, the minimum distance between the side wall of the avoidance opening 2751 and the current collecting disk is in the range of 0.5mm-5mm. The minimum distance between the side wall of the avoidance opening 2751 and the current collecting disk mentioned here can be understood as L3 shown in Figure 8. When the minimum distance between the side wall of the avoidance opening 2751 and the current collecting disk is less than 0.5mm, there is a risk that the outer edge protrusion 275 will damage the current collecting disk, shortening the service life of the current collecting disk; when the minimum distance between the side wall of the avoidance opening 2751 and the current collecting disk is greater than 5mm, the outer edge protrusion 275 will not be able to effectively limit the current collecting disk, making it easy for the current collecting disk to extend radially out of the insulating isolation member 270 after folding, thereby reducing the working performance of the battery cell 1000.

[0137] Therefore, some embodiments of the present disclosure set the minimum distance between the side wall of the avoidance opening 2751 and the current collecting plate to 0.5mm-5mm. This can prevent the outer edge protrusion 275 from damaging the current collecting plate and also prevent the current collecting plate from extending radially out of the insulating isolation part 270 after folding.

[0138] In some embodiments, the minimum distance between the side wall of the avoidance opening 2751 and the collecting plate is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0139] In some embodiments, as shown in Figure 1, the cover assembly 200 also includes an insulating member 400, which is arranged in the second mounting hole 212 and located between the pole 250 and the cover body 210 to insulate the cover body 210 and the pole 250, thereby avoiding the cover body 210 and the pole 250 from forming an electrical connection to ensure the working performance of the battery cell 1000.

[0140] In some embodiments, as shown in Figure 1, the insulating member 400 includes an insulating sheet 430 and a sealing ring 440. The insulating sheet 430 is arranged on one side of the cover body 210 and a portion of the structure of the insulating sheet 430 extends into the second mounting hole 212. The sealing ring 440 is arranged on the other side of the cover body 210 and a portion of the structure of the sealing ring 440 extends into the second mounting hole 212, so as to realize that the insulating member 400 is arranged in the second mounting hole 212 and is located between the pole 250 and the cover body 210, thereby realizing the insulation spacing between the cover body 210 and the pole 250, and reducing the difficulty of installing the insulating member 400 on the cover body 210.

[0141] In some embodiments, the insulating sheet 430 is arranged on the outside of the cover body 210, and the sealing ring 440 is arranged on the inside of the cover body 210. The insulating sheet 430 is injection molded with a high-performance thermoplastic resin, for example, polyphenylene sulfide, to ensure the insulation performance of the insulating sheet 430, so that the cover body 210 and the pole 250 can effectively form an insulating gap. The sealing ring 440 is made of fluororubber, EPDM rubber or fusible polytetrafluoroethylene. In this way, while ensuring the insulation performance of the sealing ring 440, the sealing ring 440 can also have a certain sealing performance, provide a sealing function for the pole 250, and prevent the electrolyte in the battery cell 1000 from overflowing.

[0142] In some embodiments, as shown in FIG1 , the cover plate assembly 200 further includes a buffer member 500 disposed between the insulating member 400 and the first limiting portion 251. This prevents the first limiting portion 251 from damaging the insulating member 400 during the molding process, thereby extending the service life of the insulating member 400 and ensuring the insulation performance of the insulating member 400.

[0143] Moreover, during the forming process of the first limiting portion 251, the buffer member 500 can be used to provide limiting support for the first limiting portion 251, thereby improving the structural strength of the first limiting portion 251 after forming and ensuring the position stability of the first limiting portion 251, thereby improving the position stability of the pole 250 and ensuring the performance of the pole 250.

[0144] In some embodiments, the buffer member 500 is stamped and formed from aluminum. While reducing the difficulty of forming the buffer member 500, it can also make the buffer member 500 have a certain structural strength, so that it is convenient to use the buffer member 500 to limit and support the first limiting portion 251, thereby improving the structural strength of the first limiting portion 251 after forming, and avoiding the first limiting portion 251 from damaging the insulating member 400 during the forming process, thereby extending the service life of the insulating member 400.

[0145] It should be noted that the aluminum material mentioned above can be 1 series aluminum or other series aluminum, and is not limited here.

[0146] The battery cell 1000 according to some embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0147] 1 , 2 and 11 , a battery cell 1000 according to some embodiments of the present disclosure includes: a housing 300 and a cap assembly 200 .

[0148] The cover assembly 200 is disposed on the housing 300 . The cover assembly 200 is the aforementioned cover assembly 200 , and the structure of the cover assembly 200 is not described in detail herein.

[0149] As can be seen from the above structure, the battery cell 1000 of some embodiments of the present disclosure can effectively ensure the working performance of the explosion-proof valve 700 by adopting the aforementioned cover plate assembly 200, thereby improving the working performance of the battery cell 1000 and ensuring the reliability of the battery cell 1000.

[0150] In some embodiments, the explosion-proof valve 700 is in the shape of an arc extending along the circumference of the cover plate body 210, and the center of the explosion-proof valve 700 coincides with the geometric center of the battery cell 1000. This means that when the explosion-proof valve 700 is formed in the shape of an arc extending along the circumference of the cover plate body 210, the center of the explosion-proof valve 700 coincides with the geometric center of the battery cell 1000, so as to ensure the extension length of the explosion-proof valve 700 extending along the circumference of the cover plate body 210, thereby ensuring the area of ​​the explosion-proof valve 700.

[0151] In some embodiments, as shown in FIG11 , the battery cell 1000 is a cylindrical battery, which can provide the battery cell 1000 with advantages such as high capacity, long cycle life, and wide operating temperature range, thereby ensuring the working performance of the battery cell 1000 .

[0152] It should be noted that, when the battery cell 1000 is a cylindrical battery, the center of the explosion-proof valve 700 coincides with the center of the battery cell 1000. The center of the circle here refers to the center of the circle where the battery cell is located.

[0153] In some embodiments, as shown in FIG11 , the battery cell 1000 further includes a core 320 . The housing 300 is formed with a receiving cavity. The core 320 is disposed within the receiving cavity and has a positive tab and a negative tab. Thus, by locating the core 320 within the receiving cavity, the core 320 can be placed within the housing 300 , thereby facilitating the use of the housing 300 to protect the core 320, extending the service life of the core 320 , and improving the reliability of the core 320 . Furthermore, by providing the positive and negative tabs on the core 320 , the positive and negative tabs can be used to extract current from the core 320 , thereby ensuring the operating performance of the core 320 .

[0154] In some embodiments, in combination with Figures 1, 2 and 11, the battery cell 1000 includes a positive cover plate assembly 280 and a negative cover plate assembly 290. The positive cover plate assembly 280 is arranged in the outer shell 300 and is electrically connected to the positive electrode ear through the positive electrode collecting plate 100. The negative cover plate assembly 290 is arranged in the outer shell 300 and is electrically connected to the negative electrode ear through the negative electrode collecting plate 101. At least one of the positive cover plate assembly 280 or the negative cover plate assembly 290 is the aforementioned cover plate assembly 200.

[0155] It should be noted that “at least one of A, B and C” has the same meaning as “at least one of A, B or C”, both including the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0156] What is meant here is that the battery cell 1000 also includes a positive current collecting disc 100 and a negative current collecting disc 101. The positive cover plate assembly 280 is electrically connected to the positive electrode ear through the positive current collecting disc 100, thereby realizing the electrical connection between the positive cover plate assembly 280 and the pole core 320. The negative cover plate assembly 290 is electrically connected to the negative electrode ear through the negative current collecting disc 101, and can also realize the electrical connection between the negative cover plate assembly 290 and the pole core 320, so as to facilitate the use of the positive cover plate assembly 280 and the negative cover plate assembly 290 to cooperate in drawing out the current of the pole core 320, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0157] In some embodiments, the positive electrode current collecting plate 100 is respectively penetrated and welded to the positive electrode ear of the electrode core 320 and the electrode post 250 on the positive electrode cover plate assembly 280. In this way, while the electrode core 320 and the electrode post 250 can be electrically connected, the connection strength between the positive electrode current collecting plate 100 and the electrode core 320 and the positive electrode cover plate assembly 280 can be ensured, and the connection difficulty between the positive electrode current collecting plate 100 and the electrode core 320 and the positive electrode cover plate assembly 280 can be reduced, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0158] Correspondingly, the negative electrode current collecting plate 101 is penetrated and welded to the negative electrode ear of the electrode core 320 and the negative electrode cover plate assembly 290 respectively.

[0159] In some embodiments, the positive electrode cover plate assembly 280 and the negative electrode cover plate assembly 290 are both formed as the aforementioned cover plate assembly 200 to increase the detonation area of ​​the explosion-proof valve 700, improve the reliability of the battery cell 1000, and also make the structures of the positive electrode cover plate assembly 280 and the negative electrode cover plate assembly 290 consistent, facilitate the use of a unified mold processing, and reduce the molding difficulty of the positive electrode cover plate assembly 280 and the negative electrode cover plate assembly 290.

[0160] In some embodiments, the housing 300 is formed by stamping or welding, and the material of the housing 300 is aluminum or steel.

[0161] In some embodiments, the positive electrode current collecting disc 100 is made of aluminum, and the negative electrode current collecting disc 101 is made of copper.

[0162] Of course, in some other embodiments, the material of the negative electrode current collecting disk 101 is not limited to copper, but may also be steel. When the battery cell 1000 is a sodium battery, the material of the negative electrode current collecting disk 101 may also be aluminum, which is not limited here.

[0163] In some embodiments, the positive electrode current collecting disc 100 and the negative electrode current collecting disc 101 have the same structure. As shown in Figures 5 and 9, the positive electrode current collecting disc 100 and the negative electrode current collecting disc 101 both include a first connecting portion 110, an intermediate portion 130, and a second connecting portion 120. The first connecting portion 110, the intermediate portion 130, and the second connecting portion 120 are stacked in the axial direction of the pole core 320. The first connecting portion 110 is electrically connected to the cover plate assembly 200, and the second connecting portion 120 is electrically connected to the pole core 320. The axial direction of the pole core 320 mentioned here can also be understood as the up and down direction shown in Figure 11. By arranging the first connecting part 110, the middle part 130 and the second connecting part 120 to be stacked in the axial direction of the pole core 320, it is convenient to use the collecting plate to connect the two structural members (such as the cover plate assembly 200 and the pole core 320) arranged in the up and down directions, thereby reducing the difficulty of connecting the cover plate assembly 200 and the pole core 320 spaced apart in the up and down directions, thereby realizing the electrical connection between the pole core 320 and the cover plate assembly 200, so as to facilitate the use of the cover plate assembly 200 to lead the current of the pole core 320, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0164] Moreover, by arranging the first connecting portion 110, the middle portion 130 and the second connecting portion 120 to be stacked in the axial direction of the pole core 320, the size of the collecting plate (such as the positive collecting plate 100 and the negative collecting plate 101) in the thickness direction can also be reduced, thereby reducing the axial size of the battery cell 1000 and reducing the difficulty of assembling the battery cell 1000.

[0165] It should be noted that, for the sake of convenience, the positive electrode current collecting disc 100 and the negative electrode current collecting disc 101 are collectively referred to as current collecting discs hereinafter.

[0166] In some embodiments, during the processing of the collecting disc, the collecting disc is first formed into the shape of Figure 12. After the processing of the collecting disc is completed, the collecting disc is folded (as shown in Figure 9), so that the first connecting portion 110, the middle portion 130 and the second connecting portion 120 of the collecting disc are stacked in the axial direction of the pole core 320, so as to facilitate the use of the collecting disc to realize the electrical connection between the cover plate assembly 200 and the pole core 320, reduce the difficulty of connecting the cover plate assembly 200 and the pole core 320, reduce the space occupied by the collecting disc, and reduce the difficulty of molding the collecting disc.

[0167] In some embodiments, as shown in FIG9 , the second connecting portion 120 further includes an identification area 122, which is provided near the connection between the middle portion 130 and the second connecting portion 120. In other words, the identification area 122 is provided near the connection between the middle portion 130 and the second connecting portion 120. The identification area 122 helps workers quickly determine the position of the connection between the middle portion 130 and the second connecting portion 120, thereby facilitating folding the current collecting tray from the shape of FIG12 to the shape shown in FIG9 , reducing the difficulty of forming the current collecting tray and ensuring the structural accuracy of the current collecting tray after forming, thereby avoiding reducing the area of ​​the second connecting portion 120, thereby ensuring the connection area between the current collecting tray and the pole core 320, and improving the operating performance of the battery cell 1000.

[0168] That is, some embodiments of the present disclosure can reduce the difficulty of forming the collecting disc by providing the identification area 122 , while also limiting the folding position of the collecting disc to ensure the connection area between the second connecting portion 120 and the pole core 320 .

[0169] In some embodiments, as shown in FIG9 , the line connecting the two opposing side walls of the middle portion 130 and the connection point of the second connecting portion 120 is a first connecting line T1, and the minimum distance between the marking area 122 and the first connecting line T1 ranges from -2 mm to +2 mm. This can also be understood as the line connecting the middle portion 130 and the second connecting portion 120 being the first connecting line T1, and the distance between the marking area 122 and the first connecting line T1 being multiple. The minimum distance between the marking area 122 and the first connecting line T1 ranges from -2 mm to +2 mm, and the minimum distance between the marking area 122 and the first connecting line T1 can also be understood as T2 shown in FIG9 .

[0170] It should be noted that when the minimum distance between the identification area 122 and the first connecting line T1 is less than -2 mm, the area of ​​the second connecting portion 120 will be reduced, thereby reducing the connection area between the second connecting portion 120 and the pole core 320; when the minimum distance between the identification area 122 and the first connecting line T1 is greater than 2 mm, the area of ​​the middle portion 130 will be reduced, reducing the structural strength of the middle portion 130, and also causing the first connecting portion 110, the middle portion 130 and the second connecting portion 120 to be unable to be stacked in the axial direction of the pole core 320, affecting the performance of the collecting plate.

[0171] Therefore, some embodiments of the present disclosure set the value range of the minimum distance between the identification area 122 and the first connecting line T1 to -2mm to +2mm, while ensuring the connection area between the second connecting portion 120 and the pole core 320, and at the same time ensuring the area of ​​the middle portion 130, so that the first connecting portion 110, the middle portion 130 and the second connecting portion 120 can be effectively stacked in the axial direction of the pole core 320, thereby ensuring the performance of the collecting plate.

[0172] In some examples, the minimum distance between the marking area 122 and the first connecting line T1 is -2 mm, -1 mm, 0 mm, 1 mm, or 2 mm.

[0173] In some embodiments, as shown in FIG12 , the maximum width of the identification area 122 is D3, and the minimum width of the middle portion 130 is D4. For example, 0.2<D3 / D4<1. In other words, the maximum width of the identification area 122 is less than the minimum width of the middle portion 130, and the ratio of the maximum width of the identification area 122 to the minimum width of the middle portion 130 is greater than 0.2. This prevents the identification area 122 from reducing the structural strength of the collector tray while ensuring that the identification area 122 has a certain width. This facilitates the use of the identification area 122 to limit the folding position of the collector tray, thereby reducing the difficulty of forming the collector tray.

[0174] In some embodiments, the ratio of the maximum width of the logo area 122 to the minimum width of the middle portion 130 is 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, etc.

[0175] In some embodiments, as shown in conjunction with Figures 8 and 9 , the identification area 122 is a through hole extending through the second connecting portion 120 or a groove provided in the second connecting portion 120. In other words, the identification area 122 can be formed as a through hole extending through the second connecting portion 120 or as a groove provided in the second connecting portion 120. There is no limitation here, as long as the position of the identification area 122 can be visually observed by the staff, so that the identification area 122 can be used to determine the folding position of the collecting tray.

[0176] For example, the figure shows that the shape of the identification area 122 is a triangle, but in some other embodiments, the shape of the identification area 122 may also be a rectangle, a circle, an ellipse or an irregular shape.

[0177] In some embodiments, as shown in Figure 12, the second connecting portion 120 includes a connecting area 121 suitable for electrically connecting to the pole core 320, and the connecting area 121 includes relative side walls 1211 spaced apart in a first direction, and the distance between the relative side walls 1211 is the width of the connecting area 121, and the width of the portion of the connecting area 121 close to the edge of the current collecting disk is greater than the width of the portion of the connecting area 121 close to the geometric center of the current collecting disk, and the first direction is arranged perpendicular to the thickness direction of the current collecting disk.

[0178] The first direction mentioned here can also be understood as the X direction shown in Figure 12, and the geometric center of the current collecting disk can be understood as a position close to the radial middle of the current collecting disk, that is, in the X direction, the connection area 121 has relative side walls 1211 spaced apart, and the distance between the relative side walls 1211 is defined as the width of the connection area 121, and the width of the portion of the connection area 121 close to the edge of the current collecting disk is set to be greater than the width of the portion of the connection area 121 close to the geometric center of the current collecting disk, so that the width of the portion of the connection area 121 close to the edge of the current collecting disk is larger, so as to increase the connection area between the connection area 121 and the outer pole piece of the pole core 320, thereby ensuring the connection area between the current collecting disk and the outer pole piece of the pole core 320, improving the connection strength between the current collecting disk and the pole core 320, and reducing the connection impedance, which is beneficial to improving the working performance of the battery cell 1000.

[0179] In addition, by providing a connection area 121 electrically connected to the pole core 320 on the second connection part 120, the electrical connection between the second connection part 120 and the pole core 320 can be achieved, that is, the electrical connection between the collecting plate and the pole core 320 can be achieved. Since the second connection part 120 is connected to the first connection part 110, after the second connection part 120 is connected to the pole core 320, the electrical connection between the pole core 320 and the cover plate assembly 200 can be achieved, so that the current of the pole core 320 can be drawn out using the cover plate assembly 200, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0180] It should be noted that in the relevant technology, especially the cylindrical pole core, as the diameter of the pole core 320 increases, the circumference of the outer pole piece of the pole core 320 will also increase accordingly. When the width of the portion of the connection area 121 close to the edge of the current collecting disk is set to be consistent with the width of the portion of the connection area 121 close to the geometric center of the current collecting disk, the connection area between the outer pole piece and the current collecting disk will be smaller, resulting in low connection strength between the outer pole piece and the current collecting disk, and increased impedance. Some embodiments of the present disclosure can effectively solve the technical problem of the small connection area between the outer pole piece and the current collecting disk by setting the width of the portion of the connection area 121 close to the edge of the current collecting disk to be larger than the width of the portion of the connection area 121 close to the geometric center of the current collecting disk, thereby improving the connection strength between the current collecting disk and the pole core 320 and reducing the connection impedance.

[0181] In some embodiments, a recess may be punched out on the second connecting portion 120 to form a connecting area 121 on the second connecting portion 120 , and the connecting area 121 may be stamped to reduce the difficulty of forming the connecting area 121 , ensure the structural strength of the connecting area 121 , and facilitate the electrical connection between the second connecting portion 120 and the pole core 320 .

[0182] In some embodiments, the pit protrudes toward the pole core 320 so that the connection area 121 protrudes toward the pole core 320, which facilitates the electrical connection between the connection area 121 and the pole core 320 and ensures the connection yield between the connection area 121 and the pole core 320.

[0183] In some embodiments, the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 ranges from 2 mm to 6 mm. The minimum width of the connection area 121 mentioned here can be understood as D1 shown in Figure 12, and the maximum width of the connection area 121 can be understood as D2 shown in Figure 12. When the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 is less than 2 mm, under the premise of a certain minimum width of the connection area 121, the connection area between the connection area 121 and the outer pole piece of the pole core 320 cannot be effectively increased; when the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 is greater than 6 mm, under the premise of a certain minimum width of the connection area 121, the maximum width of the connection area 121 will be wider, thereby reducing the connection area between the first connection portion 110 and the second connection portion 120.

[0184] Therefore, some embodiments of the present disclosure set the value range of the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 to 2mm~6mm. In this way, while ensuring the connection area between the connection area 121 and the outer pole piece of the pole core 320, the connection area between the connection area 121 and the inner pole piece of the pole core 320 can also be ensured, thereby ensuring the connection area between the collecting disk and the pole core 320, improving the connection strength between the collecting disk and the pole core 320, and reducing the connection impedance.

[0185] In some examples, the difference between the minimum width of the connection region 121 and the maximum width of the connection region 121 is 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc.

[0186] In some embodiments, the minimum width of the connection area 121 ranges from 1 mm to 10 mm. That is, D1 ranges from 1 mm to 10 mm. When D1 is less than 1 mm, the difficulty of forming the connection area 121 increases, while also reducing the connection area between the connection area 121 and the inner pole piece of the pole core 320. When D1 is greater than 10 mm, the difference between the minimum width and the maximum width of the connection area 121 ranges from 2 mm to 6 mm, resulting in a wider maximum width D2 of the connection area 121, reducing the connection area between the first connection portion 110 and the second connection portion 120.

[0187] Therefore, some embodiments of the present disclosure set the minimum width of the connection area 121 to a value range of 1 mm to 10 mm. While reducing the difficulty of forming the connection area 121 and increasing the connection area between the connection area 121 and the inner pole piece of the pole core 320, it can also ensure the connection area between the first connection part 110 and the second connection part 120, thereby ensuring the working performance of the battery cell 1000.

[0188] In some examples, the minimum width of the connection region 121 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0189] In some embodiments, as shown in FIG12 , the second connection portion 120 includes two connection areas 121 symmetrically arranged about the geometric center of the current collecting plate. This ensures a sufficient connection area between the second connection portion 120 and the pole core 320 while simplifying the structure of the current collecting plate, reducing its manufacturing difficulty and ensuring that the connection points between the current collecting plate and the pole core 320 are evenly distributed on the pole core 320.

[0190] In some embodiments, as shown in FIG12 , the connection area 121 is welded to the pole core 320, and a weld mark 1212 is provided on the connection area 121. It can also be understood that after the connection area 121 and the pole core 320 are welded, a weld mark 1212 is formed on the connection area 121. The welded connection not only achieves electrical connection between the connection area 121 and the pole core 320, but also ensures the connection strength between the connection area 121 and the pole core 320, thereby stabilizing the relative position of the connection area 121 and the pole core 320, thereby ensuring the operating performance of the battery cell 1000.

[0191] In some embodiments, the connection area 121 and the pole core 320 are welded together by pulse spot welding.

[0192] When the connection area 121 and the pole core 320 are welded together by pulse spot welding, as shown in FIG12 , the weld line 1212 includes a plurality of welding points 1213 , and the plurality of welding points 1213 cooperate to achieve a fixed connection between the connection area 121 and the pole core 320 .

[0193] In other embodiments, the connection area 121 and the pole core 320 are welded by laser beam welding. When the connection area 121 and the pole core 320 are welded by laser beam welding, the weld line 1212 is formed as a weld line.

[0194] In some embodiments, as shown in FIG12 , in the first direction, multiple rows of weld lines 1212 are provided in the connection area 121, each row of weld lines 1212 includes multiple weld points 1213, and adjacent rows of weld points 1213 are staggered. Thus, by providing multiple rows of weld lines 1212 in the connection area 121, the connection area between the connection area 121 and the pole core 320 can be increased, thereby improving the connection strength between the connection area 121 and the pole core 320 and ensuring the connection effect between the connection area 121 and the pole core 320; by staggering adjacent rows of weld points 1213, mutual interference between adjacent rows of weld points 1213 can be avoided, thereby reducing the thermal impact between the weld points 1213, improving the welding yield, and also making the distribution of the multiple weld points 1213 more uniform and lowering the impedance.

[0195] It should be noted that the staggered arrangement of the adjacent rows of welds 1213 mentioned above can also be understood as, in two adjacent rows of weld lines 1212, in the width direction of the connection area 121, the weld points 1213 of one row of weld lines 1212 are directly opposite to the position between the two weld points 1213 of the other row of weld lines 1212, thereby avoiding mutual interference between the weld points 1213 in the adjacent rows during the welding process, reducing the thermal impact between the weld points 1213, and improving the welding yield.

[0196] Of course, in some other embodiments, under the premise that the width of the connection area 121 is large enough, the welding points 1213 in adjacent rows may also be arranged to face each other in the width direction of the connection area 121 .

[0197] In some embodiments, as shown in FIG12 , the number of weld lines 1212 near the edge of the current collecting disk is greater than the number of weld lines 1212 near the geometric center of the current collecting disk. In other words, the number of weld lines 1212 near the edge of the current collecting disk is greater than the number of weld lines 1212 near the geometric center of the current collecting disk, thereby effectively increasing the connection area between the connection region 121 and the outer pole piece of the pole core 320, improving the connection strength between the current collecting disk and the pole core 320, and reducing the connection impedance.

[0198] It should be noted that Figure 12 shows an example in which the number of weld marks 1212 near the edge of the collecting plate is three rows and the number of weld marks 1212 near the geometric center of the collecting plate is two rows. In some other embodiments, the number of weld marks 1212 near the edge of the collecting plate can be set to four rows and the number of weld marks 1212 near the geometric center of the collecting plate can be set to three rows, or the number of weld marks 1212 near the edge of the collecting plate can be set to four rows and the number of weld marks 1212 near the geometric center of the collecting plate can be set to two rows. There is no restriction here, as long as the number of weld marks 1212 near the edge of the collecting plate is greater than the number of weld marks 1212 near the geometric center of the collecting plate.

[0199] In some embodiments, as shown in Figure 1, the cover body 210 is provided with an injection channel 211, and the insulating isolation piece 270 is provided with an injection hole 276 facing the injection channel 211. The injection channel 211 and the injection hole 276 cooperate to realize the injection of liquid toward the pole core 320, thereby ensuring the working performance of the pole core 320.

[0200] In some embodiments, as shown in Figures 1 and 11, the injection channel 211 has an inlet and an outlet, both of which are provided with a blocking member 600. Thus, the blocking member 600 can be used to block the injection channel 211, preventing foreign matter from entering the battery cell 1000 through the injection channel 211 and preventing the electrolyte in the battery cell 1000 from overflowing through the injection channel 211, thereby ensuring the operating performance of the battery cell 1000.

[0201] In some examples, after the injection through the injection channel 211 is completed, the blocking member 600 is used to block the inlet and outlet of the injection channel 211 .

[0202] In some embodiments, as shown in Figures 9 and 10, a boss 240 is provided on one side of the insulating spacer 270 and is arranged around the periphery of the injection hole 276. The boss 240 can guide the electrolyte flowing out of the injection hole 276 to flow toward the pole core 320 to further improve the injection effect.

[0203] In some embodiments, as shown in Figures 9, 10, and 12, the second connection portion 120 further includes a relief portion 123 for avoiding the injection hole 276. This prevents the second connection portion 120 from obstructing the injection hole 276 from injecting liquid, thereby ensuring that the electrolyte flowing through the injection hole 276 can effectively flow to the electrode core 320, thereby ensuring the injection effect.

[0204] In some embodiments, the minimum distance between the avoidance portion 123 and the injection hole 276 ranges from 0 mm to 10 mm. This prevents interference between the collecting plate and the injection hole 276 while ensuring the area of ​​the collecting plate, thereby ensuring the welding area between the collecting plate and the pole core 320 and improving the welding effect.

[0205] It should be noted that, as shown in Figures 9 and 10, when a boss 240 is provided on the periphery of the injection hole 276, the above-mentioned minimum distance between the avoidance portion 123 and the injection hole 276 can be understood as the minimum distance between the avoidance portion 123 and the boss 240, that is, T3 shown in Figure 10. In this way, while avoiding the collecting plate from blocking the injection hole 276, it can also prevent the collecting plate from interfering with the boss 240, thereby reducing the welding thermal deformation of the connection area 121.

[0206] The battery assembly 2000 according to some embodiments of the present disclosure is described below.

[0207] As shown in FIG. 13 , a battery assembly 2000 according to some embodiments of the present disclosure includes: a plurality of battery cells 1000 .

[0208] The battery cell 1000 is the aforementioned battery cell 1000 , and the structure of the battery cell 1000 is not described in detail here.

[0209] As can be seen from the above structure, the battery assembly of some embodiments of the present disclosure can improve the working performance of the battery assembly 2000 and ensure the reliability of the battery assembly 2000 by adopting the aforementioned battery cell 1000.

[0210] It should be noted that the battery assembly mentioned here can be a battery pack or a battery module.

[0211] The following describes an electric device 3000 according to some embodiments of the present disclosure.

[0212] As shown in FIG. 14 , an electric device 3000 according to some embodiments of the present disclosure includes: a battery assembly.

[0213] The battery assembly is the aforementioned battery assembly 2000, and the structure of the battery assembly is not described in detail here.

[0214] As can be seen from the above structure, the electrical device 3000 of some embodiments of the present disclosure adopts the aforementioned battery assembly 2000 to improve the working performance of the electrical device 3000 and ensure the reliability of the electrical device 3000.

[0215] It should be noted that the electrical device 3000 mentioned here can be but is not limited to a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc.

[0216] Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys; spacecraft may include airplanes, rockets, space shuttles and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0217] In the description of this disclosure, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0218] It should be noted that two protective sheets 800 are shown in Figure 4 for illustrative purposes, but after reading the above technical solution, ordinary technicians can obviously understand that the solution can be applied to a technical solution of three or more protective sheets 800, which also falls within the scope of protection of this disclosure.

[0219] The structure of the cover plate assembly 200 of the battery cell 1000 according to some embodiments of the present disclosure, the battery cell 1000, the battery assembly and other components of the electrical device, such as the pole core 320, are all known to those skilled in the art and will not be described in detail here.

[0220] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of these 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.

[0221] Although the embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and purpose of the present disclosure, and that the scope of the present disclosure is defined by the claims and their equivalents. Any technical disclosure in the present disclosure, as well as the recombination of multiple technical disclosures, that can form a complete technical solution and solve one or more of the aforementioned technical problems and achieve the purpose of the disclosure, all belong to the content of the present disclosure and are directly and unambiguously determined based on the content of the present disclosure.

[0222] Those skilled in the art will understand that the scope of the present disclosure is not limited to the above specific embodiments, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the present application. The scope of the present application is limited by the appended claims.

Claims

1. A cover plate assembly (200) for a battery cell (1000), comprising: a cover plate body (210), wherein the outer peripheral wall of the cover plate body (210) is suitable for being connected to the outer shell (300) of the battery cell (1000); and At least one explosion-proof valve (700), the at least one explosion-proof valve (700) is provided on the cover plate body (210), and the minimum distance between the at least one explosion-proof valve (700) and the outer peripheral wall of the cover plate body (210) ranges from 0.5 mm to 3.05 mm.

2. The cover plate assembly (200) of the battery cell (1000) according to claim 1, wherein: The explosion-proof valve (700) extends along the circumference of the cover plate body (210).

3. The cover plate assembly (200) of the battery cell (1000) according to claim 2, wherein: The explosion-proof valve (700) is formed into a long strip extending along the circumference of the cover body (210), the connecting line between one end point of the explosion-proof valve (700) and the center of the cover body (210) is a first connecting line, the connecting line between the other end point of the explosion-proof valve (700) and the center of the cover body (210) is a second connecting line, and the angle between the first connecting line and the second connecting line ranges from 10° to 225°.

4. The cover plate assembly (200) of the battery cell (1000) according to claim 3, wherein: The explosion-proof valve (700) is formed in an arc shape extending along the circumference of the cover plate body (210).

5. The cap plate assembly (200) of the battery cell (1000) according to any one of claims 2 to 4, wherein: The at least one explosion-proof valve (700) comprises a plurality of explosion-proof valves (700), wherein the plurality of explosion-proof valves (700) are arranged at intervals along the circumference of the cover plate body (210), and at least one explosion-proof valve (700) among the plurality of explosion-proof valves (700) extends along the circumference of the cover plate body (210).

6. The cap plate assembly (200) of the battery cell (1000) according to any one of claims 1 to 5, wherein: A first mounting hole (213) is provided on the cover plate body (210), and the explosion-proof valve (700) is provided in the first mounting hole (213).

7. The cover plate assembly (200) of the battery cell (1000) according to claim 6, wherein: The explosion-proof valve (700) is in an arc shape extending along the circumference of the cover plate body (210), and the shape of the first mounting hole (213) is adapted to the shape of the explosion-proof valve (700).

8. The cover plate assembly (200) of the battery cell (1000) according to claim 6 or 7, wherein: At least one first reinforcing rib (214) is provided in the first mounting hole (213).

9. The cover plate assembly (200) of the battery cell (1000) according to claim 8, wherein: The width of the first reinforcing rib (214) ranges from 0.5 mm to 2.5 mm.

10. The cover assembly (200) of the battery cell (1000) according to any one of claims 1 to 9, further comprising a pole (250), wherein the pole (250) is provided on the cover body (210), and the outer peripheral wall of the pole (250) is connected to the cover body (210), and the minimum distance between the explosion-proof valve (700) and the outer peripheral wall of the pole (250) is in the range of 0.5 mm to 20 mm.

11. The cover plate assembly (200) of the battery cell (1000) according to any one of claims 6 to 10, further comprising an insulating spacer (270), wherein the insulating spacer (270) is provided on one side of the cover plate body (210), and the insulating spacer (270) is provided with a connecting hole (272) that is at least partially arranged opposite to the first mounting hole (213).

12. The cap plate assembly (200) of the battery cell (1000) according to claim 11, wherein: At least one second reinforcing rib (273) is provided in the communicating hole (272).

13. The cap plate assembly (200) of the battery cell (1000) according to claim 12, wherein: The width of the second reinforcing rib (273) ranges from 0.3 mm to 2 mm.

14. The cap plate assembly (200) of the battery cell (1000) according to any one of claims 11 to 13, wherein: A first surface of the insulating spacer (270) facing away from the cover plate body (210) is provided with at least one abutting boss (274), the at least one abutting boss (274) being arranged adjacent to the communicating hole (272), and the abutting boss (274) being suitable for abutting against the collecting plate (4000).

15. The cap plate assembly (200) of the battery cell (1000) according to claim 14, wherein: The abutment boss (274) satisfies at least one of the following conditions: the height of the abutment boss (274) is in the range of 0.5 mm to 2 mm; or the abutment boss (274) has an abutment surface (5000) on a side away from the insulating spacer (270), the abutment surface (5000) abuts against the current collecting plate (4000), and the area S of the abutment surface (5000) is ≥ 1.5 mm. 2 .

16. The cap plate assembly (200) of the battery cell (1000) according to claim 14 or 15, wherein: The at least one abutting boss (274) includes a plurality of abutting bosses (274), the plurality of abutting bosses (274) are arranged at intervals, and the distance between two adjacent abutting bosses (274) located on the same side of the communicating hole (272) is L, wherein 0mm<L≤6.5mm.

17. The cap plate assembly (200) of the battery cell (1000) according to any one of claims 11 to 16, wherein: An outer edge protrusion (275) is provided on the outer peripheral edge of the first surface of the insulating spacer (270) facing away from the cover plate body (210), and the outer edge protrusion (275) is provided with an escape opening (2751) for evading the collecting plate (4000).

18. A battery cell (1000), wherein: include: Housing (300); as well as A cover plate assembly (200), the cover plate assembly (200) being arranged on the housing (300), the cover plate assembly (200) being the cover plate assembly (200) according to any one of claims 1 to 17.

19. The battery cell (1000) according to claim 18, wherein: The explosion-proof valve (700) is in an arc shape extending along the circumference of the cover plate body (210), and the center of the explosion-proof valve (700) coincides with the geometric center of the battery cell (1000).

20. The battery cell (1000) according to claim 18 or 19, wherein: The battery cell (1000) is a cylindrical battery.

21. A battery assembly (2000) comprising a plurality of battery cells (1000) according to any one of claims 18 to 20.

22. An electrical device (3000) comprising the battery assembly (2000) according to claim 21.

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