Battery cover plate structure and battery cell

Abstract

Battery cover plate structure comprising a cover plate (1), an upper connecting element (2), a pole (3) and an explosion-proof valve (4), wherein the cover plate (1) is provided with a first position release hole (15) penetrating the top and bottom of the cover plate and an explosion-proof hole (11), wherein the upper connecting element (2) extends through the first position release hole (15) and the upper connecting element (2) is provided with a pole hole (21) penetrating the top and bottom of the upper connecting element, wherein the pole (3) extends through the pole hole (21) and the explosion-proof valve (4) is arranged in the explosion-proof hole (11), wherein the cover plate (1) and the upper connecting element (2) are formed integrally, or wherein the upper connecting element (2) and the explosion-proof valve (4) are formed integrally.

Description

[0001] This application claims priority to Chinese patent applications filed on March 28, 2023, with the Chinese Patent Office under application numbers 202320641229.8 and 202320632781.0, the entire contents of which are incorporated into this application by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery structures and in particular to a battery cover plate structure and a battery cell. STATE OF THE ART

[0003] In the prior art, the negative electrode cover plate of the cylindrical battery with an aluminum shell and the plastic top are usually connected by a rivet structure. After the negative electrode of the cylindrical battery with an aluminum shell and a plastic top is injection-molded, it is firmly connected to the explosion-proof valve through a laser welding process. The above-mentioned battery cover plate structure often has the following shortcomings: the structure of the cover plate is complex, there are relatively many parts, and the assembly and production efficiency of the cover plate is low, which has become a bottleneck in the assembly and production of battery cell structural parts. DISCLOSURE OF THE INVENTION

[0004] The purpose of the present application is to provide a battery cover plate structure and a battery cell, reduce the number of assembly parts, improve assembly efficiency, and reduce manufacturing costs.

[0005] To achieve this purpose, the present application applies the following technical solutions:

[0006] In a first aspect, a battery cover plate structure is provided which comprises a cover plate, an upper connecting member, a pole, and an explosion-proof valve, wherein the cover plate is provided with a first position release hole penetrating the top and bottom surfaces of the cover plate and an explosion-proof hole, wherein the upper connecting member penetrates through the first position release hole and the upper connecting member is provided with a pole hole penetrating the top and bottom surfaces of the upper connecting member, wherein the pole is arranged penetrating in the pole hole and the explosion-proof valve is provided in the explosion-proof hole, wherein the cover plate and the upper connecting member are formed integrally, or wherein the upper connecting member and the explosion-proof valve are formed integrally.

[0007] In a second aspect, a battery cell is provided comprising a battery cover plate structure as described above. Advantageous effects of the present application:

[0008] The battery cover plate structure provided in the present application includes a cover plate, an upper connecting member, a terminal, and an explosion-proof valve, wherein the upper connecting member fixes the terminal to the terminal hole, and the upper connecting member and the cover plate are integrally molded, and it is not necessary to use a rivet structure to connect the upper connecting member and the cover plate, and wherein the upper connecting member and the inner wall of the first position release hole are completely sealed from each other, which not only increases the deformation resistance and overall structural strength of the battery cell, but also eliminates the risk of leakage due to structural deformation of the battery cover plate structure and improves the sealing reliability of the battery cell, and at the same time, the number of assembly parts is reduced, assembly efficiency is improved, and manufacturing costs are reduced.Alternatively, the upper connecting element and the explosion-proof valve are integrally formed, and the explosion-proof valve can be fixed in the explosion-proof hole using the upper connecting element and does not need to be fixed by welding methods such as laser welding, thus avoiding the risk of poor sealing caused by defects such as poor welding and improving the sealing reliability of the explosion-proof hole, while reducing the number of assembly parts, improving assembly efficiency and reducing manufacturing costs. PRESENTATION OF THE INVENTION Fig. 1 is a schematic structural exploded view of the battery cover plate structure provided by a first embodiment of the present application; Fig. 2 is a sectional view of the battery cover plate structure provided by a first embodiment of the present application; Fig. 3 is a schematic structural exploded view of the battery cover plate structure provided by a second embodiment of the present application; Fig. 4 is a sectional view of the battery cover plate structure provided by a second embodiment of the present application. List of reference symbols:

[0009] 1. Cover plate; 11. Explosion-proof hole; 13. Communication groove; 14. Sealing step; 15. First position release hole; 2. Upper connecting member; 21. Pole hole; 22. Positioning post; 3. Pole; 31. Upper connecting section; 32. Lower connecting section; 4. Explosion-proof valve; 41. Sealing flange; 5. Protective film; 51. Connecting structure; 6. Lower connecting member; 61. Second position release hole; 62. Plug-in post; 63. Limit groove; 64. Air guide hole; 65. Positioning groove; 7. Bus plate. CONCRETE EMBODIMENTS

[0010] To clarify the technical problems solved by the present application, the technical solutions applied, and the technical effects achieved, the embodiments of the present application are described in more detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of this application, not all of the embodiments. All other embodiments that a person skilled in the art can derive from the embodiments in the present application without creative effort are within the scope of the present application. First embodiment

[0011] The present embodiments provide a battery cell comprising a battery cell body and a battery cover plate structure located on top of the battery cell body. As shown in the Fig. 1 and Fig. 2, the battery cover plate structure comprises an upper cover plate 1, an upper connecting member 2, a terminal 3, a lower connecting member 6, and a bus plate 7. The cover plate 1 is provided with a first position release hole 15 penetrating the top and bottom surfaces of the cover plate, wherein the upper connecting member 2 is passed through the first position release hole 15, and the upper connecting member 2 is provided with a terminal hole 21 penetrating the top and bottom surfaces of the upper connecting member, wherein the terminal 3 is arranged to penetrate into the terminal hole 21; wherein the lower connecting member 6 is connected to the cover plate of the cover plate 1, and the lower connecting member 6 is provided with a second position release hole 61, wherein the terminal 3 and the upper connecting member 2 both penetrate into the second position release hole 61, and the lower connecting member 6 is used for insulating the cover plate 1;wherein a side of the lower connecting element 6 facing away from the cover plate 1 is provided with a receiving space, wherein the bus plate 7 is arranged in the receiving space and the bus plate 7 is electrically connected to the pole 3;

[0012] In a further education, as in Fig. 1 and Fig. 2, it is provided that the upper connecting member 2 is formed as a sleeve-like structure and the upper connecting member 2 is sealed with the inner wall of the first position release hole 15, and the cover plate 1 and the upper connecting member 2 are formed integrally.

[0013] Specifically, the battery cover plate structure provided by the present embodiment includes a cover plate 1, an upper connecting member 2, and a terminal 3. The upper connecting member 2 fixes the terminal 3 to the terminal hole 21. The upper connecting member 2 and the cover plate 1 are integrally formed, and it is not necessary to use a rivet structure to connect the upper connecting member 2 and the cover plate 1. The upper connecting member 2 and the inner wall of the first position release hole 15 are completely sealed from each other. This not only increases the deformation resistance and overall structural strength of the battery cell, but also eliminates the risk of leakage due to structural deformation of the battery cover plate structure and improves the sealing reliability of the battery cell, while reducing the number of assembly parts.improved assembly efficiency and reduced manufacturing costs.

[0014] For example, the cover plate 1 and the upper connecting element 2 are each made of a plastic material, which has good corrosion resistance and insulation properties, is waterproof and durable, is lightweight, is cost-effective, and is easy to form and process.

[0015] For example, the cover plate 1 and the upper connecting member 2 are integrally molded by an injection molding process, which has high production efficiency and can form products of various shapes and sizes, and the products have precise dimensions and are suitable for mass production as well as products with complex shapes.

[0016] The lower connecting element 6, for example, is made of a plastic material and has good corrosion resistance and insulation properties.

[0017] For example, the lower connecting element 6 and the cover plate 1 are connected by plugging. Specifically, as shown in Fig. 1, the lower connecting element 6 is provided with two plug-in posts 62, and the bottom of the cover plate 1 is provided with two corresponding plug-in grooves, wherein the plug-in posts 62 are each inserted into the plug-in grooves in order to establish the connection between the lower connecting piece and the cover plate 1.

[0018] An example is how in the Fig. 1 and Fig. 2, the cover plate 1 is also provided with an explosion-proof hole 11, wherein the battery cover plate structure also includes an explosion-proof valve 4 fixed in the explosion-proof hole 11, wherein the explosion-proof valve 4 can seal and block the explosion-proof hole 11, and when the internal pressure of the battery cell exceeds the threshold value, the explosion-proof valve 4 is opened and the two ends of the explosion-proof hole 11 are connected.

[0019] For example, the explosion-proof valve 4 is fixed in the explosion-proof hole 11 by laser welding, and the reliability of the sealed connection is high.

[0020] For example, a protective film 5 is provided at the upper end of the explosion-proof hole 11 for dust protection and other protective functions, and the explosion-proof hole 11 is arranged to be blocked by foreign matter, and the protective film 5 is provided with a connecting structure 51 that connects the inside and outside of the explosion-proof hole 11.

[0021] In the present embodiment, the connecting structure 51 is provided as a through-hole-like structure. In other embodiments, the connecting structure 51 may also be provided as a crack or other structure that penetrates both the top and bottom surfaces of the protective film 5.

[0022] For example, Pole 3 includes, as in Fig. 2, an upper connecting portion 31 and a lower connecting portion 32, and the upper connecting portion 31 and the lower connecting portion 32 are connected to each other and arranged from top to bottom.

[0023] For example, the bus plate 7 is made of metal materials such as copper and nickel. Second embodiment

[0024] The present embodiments provide a battery cell comprising a battery cell body and a battery cover plate structure located on top of the battery cell body.

[0025] As in the Fig. 3 and Fig. 4, the battery cover plate structure includes an upper cover plate 1, an upper connecting member 2, a pole 3, a lower connecting member 6, an explosion-proof valve 4, and a bus plate 7. The cover plate 1 is provided with a first position release hole 15 penetrating the top and bottom surfaces of the cover plate, the upper connecting member 2 is passed through the first position release hole 15, and the upper connecting member 2 is provided with a pole hole 21 penetrating the top and bottom surfaces of the upper connecting member, the pole 3 being arranged in the pole hole 21;wherein the lower connecting member 6 is connected to the cover plate of the cover plate 1, and the lower connecting member 6 is provided with a second position release hole 61, wherein the pole 3 and the upper connecting member 2 both pass through the second position release hole 61, and the lower connecting member 6 is used for insulating the cover plate 1; wherein the connecting member is further provided with an explosion-proof hole 11 penetrating the top and bottom of the connecting member, wherein the explosion-proof valve 4 is located in the explosion-proof hole 11, and the explosion-proof valve 4 can seal and block the explosion-proof hole 11, and when the internal pressure of the battery cell exceeds the threshold value, the explosion-proof valve 4 is opened and the two ends of the explosion-proof hole 11 are connected;on a side of the lower connecting element 6 facing away from the cover plate 1, a receiving space is provided, and in the receiving space the bus plate 7 is arranged, which is electrically connected to the pole 3;

[0026] In a further education, as in Fig. 3 and Fig. 4, it is provided that the upper connecting member 2 is formed as a sleeve-like structure and the upper connecting member 2 is sealed with the inner wall of the first position release hole 15, wherein the explosion-proof valve 4 is arranged in a disc-shaped structure, and the explosion-proof valve 4 and the explosion-proof hole 11 are arranged in a sealed manner, wherein the upper connecting member 2 and the explosion-proof valve 4 are formed integrally.

[0027] Specifically, the battery cover plate structure provided by the present embodiment includes a cover plate 1, an upper connecting member 2, a pole 3, and an explosion-proof valve 4, and the pole 3 is fixed in the pole hole 21 through the upper connecting member 2, the cover plate 1 is provided with an explosion-proof hole 11, and the explosion-proof valve 4 is sealed in the explosion-proof hole 11, and the upper connecting member 2 and the explosion-proof valve 4 are integrally formed.The explosion-proof valve 4 can be fixed in the explosion-proof hole 11 using the upper connecting element 2 and does not need to be fixed by welding methods such as laser welding, thus avoiding the risk of poor sealing caused by defects such as poor welding and improving the sealing reliability of the explosion-proof hole 11, while reducing the number of assembly parts, improving assembly efficiency, and reducing manufacturing costs.

[0028] For example, the upper connecting member 2 and the explosion-proof valve 4 are made of a plastic material, which has good corrosion resistance and insulation properties, and is waterproof and durable, lightweight, inexpensive, and easy to mold and process.

[0029] For example, the upper connecting member 2 and the explosion-proof valve 4 are integrally molded by an injection molding process, which has high production efficiency and can form products of various shapes and sizes, and the products have precise dimensions and are suitable for mass production and products with complex shapes.

[0030] For example, a communication groove 13 is provided between the first position release hole 15 and the explosion-proof hole 11, and the communication groove 13 is connected to the first position release hole 15 and the explosion-proof hole 11, respectively, and the connection part between the upper link 2 and the explosion-proof valve 4 is accommodated in the communication groove 13.

[0031] For example, as in the Fig. 3 and Fig. 4, a sealing step 14 is provided at each of the upper and lower ends of the explosion-proof hole 11, the upper and lower ends of the explosion-proof valve 4 being each provided with a sealing flange 41, and the sealing flanges 41 and the sealing steps 14 cooperating in a unique manner to further improve the tightness between the explosion-proof valve 4 and the explosion-proof hole 11.

[0032] In other embodiments of the present application, the sealing steps 14 may also be provided at the upper and lower ends of the explosion-proof valve 4, and the sealing steps 14 are provided at the upper and lower ends of the explosion-proof hole 11, whereby the tightness between the explosion-proof valve 4 and the explosion-proof hole 11 can also be improved.

[0033] For example, the lower end of the upper link 2 is provided with a positioning post 22, and the positioning post 22 is provided on the periphery of the body of the upper link 2, and the lower link 6 is provided with a positioning groove 65, and the positioning post 22 is inserted into the positioning groove 65 to limit the mounting angle of the upper link 2 in the horizontal plane and ensure the mounting accuracy of the explosion-proof valve 4.

[0034] For example, the positioning groove 65 is provided on the periphery of the second position release hole 61, and the positioning groove 65 is connected to the second position release hole 61 to facilitate processing and molding.

[0035] In other embodiments of the present application, the positioning post 22 may also be provided on the lower connecting member 6, and the positioning groove 65 may also be provided in the structure of the lower connecting member 6 protruding toward the circumference, which can also contribute to limiting the mounting angle of the upper connecting member 2 and ensuring the mounting accuracy of the explosion-proof valve 4.

[0036] For example, as in Fig. 3, at least two positioning posts 22 and at least two positioning slots 65 are provided to improve the reliability of defining the mounting angle of the upper connecting element 2 and to assist in assembly. Specifically, the number of positioning posts 22 and positioning grooves 65 may be two, three, four, or the like.

[0037] For example, the positioning posts 22 and the positioning grooves 65 are evenly distributed around the central axis of the second position release hole 61.

[0038] For example, as in Fig. 3, the lower connecting element 6 is also provided with a limiting groove 63 at a position associated with the explosion-proof hole 11, and the structure of the lower end of the explosion-proof valve 4 is adapted to the limiting groove 63, and the limiting groove 63 can receive and limit the lower end of the explosion-proof valve 4, to improve the reliability of the cooperation and limitation between the lower connecting element 6 and the explosion-proof valve 4.

[0039] For example, as in Fig. 3, the restricting groove 63 is provided with an air guide hole 64, the air guide hole 64 penetrating the top and bottom surfaces of the lower connecting member 6, the lower connecting member 6 being made of a plastic material and having good corrosion resistance and insulation properties, and the upper connecting member 2 and the lower connecting member 6 being firmly connected to each other by ultrasonic welding, and it is not necessary to install additional connecting materials and structures such as bolts, nails, buckles, welding materials, or adhesives, which simplifies the assembly steps and improves production efficiency.

[0040] For example, the lower connecting element 6 and the cover plate 1 are connected by plugging. Specifically, as shown in Fig.3, the lower connecting element 6 is provided with two plug-in posts 62, and the bottom of the cover plate 1 is provided with two corresponding plug-in grooves (not shown in the figure), wherein the plug-in posts 62 are each inserted into the plug-in grooves in order to establish the connection between the lower connecting element 6 and the cover plate 1.

[0041] Of course, in other embodiments of the present application, the plug-in post 62 can also be provided on the bottom of the cover plate 1, and the insertion groove can also be provided on the lower connecting element 6, which is also possible to realize the interaction between the lower connecting element 6 and the cover plate 1 by plug-in connection.

[0042] For example, the pole 3 comprises an upper connecting portion 31 and a lower connecting portion 32, and the upper connecting portion 31 and the lower connecting portion 32 are connected to each other and arranged from top to bottom.

[0043] For example, the bus plate 7 is made of metal materials such as copper and nickel.

Claims

[1] A battery cover plate structure comprising a cover plate (1), an upper connecting member (2), a pole (3), and an explosion-proof valve (4), wherein the cover plate (1) is provided with a first position release hole (15) penetrating the top and bottom surfaces of the cover plate and an explosion-proof hole (11), wherein the upper connecting member (2) passes through the first position release hole (15), and the upper connecting member (2) is provided with a pole hole (21) penetrating the top and bottom surfaces of the upper connecting member, wherein the pole (3) is arranged so as to pass through the pole hole (21), and the explosion-proof valve (4) is arranged in the explosion-proof hole (11), wherein the cover plate (1) and the upper connecting member (2) are formed integrally, or wherein the upper connecting member (2) and the explosion-proof valve (4) are formed integrally. [2] The battery cover plate structure according to claim 1, wherein the cover plate (1) and the upper connecting member (2) are each made of a plastic material when the cover plate (1) and the upper connecting member (2) are integrally formed; wherein the upper connecting member (2) and the explosion-proof valve (4) are each made of a plastic material when the upper connecting member (2) and the explosion-proof valve (4) are integrally formed. [3] The battery cover plate structure according to claim 2, wherein the cover plate (1) and the upper connecting member (2) are integrally formed by an injection molding process; wherein the upper connecting member (2) and the explosion-proof valve (4) are integrally formed by an injection molding process. [4] The battery cover plate structure according to claim 1, wherein the upper connecting member (2) and the inner wall of the first position releasing hole (15) are provided sealed from each other when the cover plate (1) and the upper connecting member (2) are integrally formed, wherein the explosion-proof valve (4) can seal and block the explosion-proof hole (11). [5] The battery cover plate structure according to claim 4, wherein the explosion-proof valve (4) is fixed in the explosion-proof hole (11) by laser welding. [6] The battery cover plate structure according to claim 4, wherein a protective film (5) is provided at the upper end of the explosion-proof hole (11), the protective film (5) being provided with a connecting structure (51) connecting the inside and the outside of the explosion-proof hole (11). [7] The battery cover plate structure according to claim 1, wherein a communication groove (13) is provided between the first position release hole (15) and the explosion-proof hole (11) when the upper connecting member (2) and the explosion-proof valve (4) are integrally formed, the communication groove (13) being connected to the first position release hole (15) and the explosion-proof hole (11). [8] The battery cover plate structure according to claim 1, wherein, when the upper connecting member (2) and the explosion-proof valve (4) are formed integrally, a sealing step (14) is provided at the upper and lower ends of one of the explosion-proof hole (11) and the explosion-proof valve (4), while a corresponding sealing flange (41) is provided at the upper and lower ends of the other of the explosion-proof hole (11) and the explosion-proof valve (4), the sealing flanges (41) and the sealing steps (14) interacting in a one-to-one manner. [9] The battery cover plate structure according to any one of claims 1 to 8, wherein the battery cover plate structure also comprises a lower connecting member (6), and the lower connecting member (6) is connected to the lower surface of the cover plate (1), the lower connecting member (6) being provided with a second position release hole (61), and the terminal (3) and the upper connecting member (2) both pass through the second position release hole (61), the lower connecting member (6) being used for insulating the cover plate (1). [10] The battery cover plate structure according to claim 9, wherein one of the lower end of the upper connecting member (2) and the lower connecting member (6) is provided with a positioning post (22), the other of the lower end of the upper connecting member (2) and the lower connecting member (6) is provided with a positioning groove (65), the positioning post (22) being fitted in the positioning groove (65). [11] Battery cover plate structure according to claim 10, wherein at least two positioning posts (22) and at least two positioning grooves (65) are provided. [12] The battery cover plate structure according to claim 11, wherein the positioning posts (22) and the positioning grooves (65) are evenly distributed around the central axis of the second position release hole (61). [13] The battery cover plate structure according to claim 10, wherein the upper connecting member (2) is provided with a positioning groove (65), the positioning groove (65) being connected to the second position release hole (61). [14] Battery cover plate structure according to claim 9, wherein the lower connecting element (6) is made of a plastic material; and / or wherein the upper connecting element (2) and the lower connecting element (6) are firmly connected to each other by ultrasonic welding. [15] The battery cover plate structure according to claim 9, wherein the lower connecting member (6) is provided with a restricting groove (63) at a position associated with the explosion-proof hole (11), the restricting groove (63) receiving and restricting the lower end of the explosion-proof valve (4). [16] The battery cover plate structure according to claim 15, wherein the restricting groove (63) is provided with an air guide hole (64), and the air guide hole (64) penetrates the upper and lower surfaces of the lower connecting member (6). [17] Battery cover plate structure according to claim 9, wherein the lower connecting member (6) and the cover plate (1) are connected to each other by plugging together. [18] The battery cover plate structure according to claim 17, wherein a plug-in post (62) is provided on one of the lower connecting member (6) and the bottom of the cover plate (1), and an insertion groove is provided on the other of the lower connecting member (6) and the bottom of the cover plate (1), the plug-in post (62) being respectively inserted into the insertion groove. [19] Battery cover plate structure according to claim 9, wherein a side of the lower connecting element (6) facing away from the cover plate (1) is provided with a receiving space, wherein the battery cover plate structure also has a bus plate (7) and the bus plate (7) is located in the receiving space, wherein the bus plate (7) is electrically connected to the pole (3). [20] A battery cover plate structure according to any one of claims 7 to 8, wherein the cover plate (1) is made of plastic, and wherein the cover plate (1) is molded integrally with the upper connecting member (2) and the explosion-proof valve (4) by injection molding. [21] The battery cover plate structure according to any one of claims 1 to 8, wherein the terminal (3) comprises an upper connecting portion (31) and a lower connecting portion (32), the upper connecting portion (31) and the lower connecting portion (32) being connected to each other and arranged from top to bottom. [22] Battery cell with a battery cover plate structure according to one of claims 1 to 21.

Images