Battery cover plate assembly and secondary battery

Abstract

The invention provides a battery cover plate assembly and a secondary battery, and the battery cover plate assembly comprises a cover plate body which is provided with a pressing block assembling area and a cover plate convex block; the pressing assemblies are correspondingly connected to the pressing block assembling areas, and any pressing assembly comprises a pressing block provided with a pressing hole, and the pressing hole is formed in one side of the pressing block in the length direction; the upper plastic comprises a clamping part and a receding groove, the clamping part is arranged on the edge of the upper plastic, the two sides of the clamping part abut against the cover plate protruding block and the pressing block respectively, and the cover plate protruding block is embedded in the receding groove; and the riveting piece sequentially penetrates through the connecting pressing block and the upper plastic through the pressing hole. The anti-warping cover plate can be highly matched with the convex block of the cover plate, so that enough expansion pulling modulus is provided for the cover plate, and the purpose of preventing the cover plate from warping is achieved. Compared with a conventional battery cover plate structure at the present stage, the battery cover plate structure has the advantages of being ingenious in structural design, remarkable in anti-warping effect, convenient to produce and prepare, capable of improving the use stability of the battery and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover assembly and a secondary battery. Background Art

[0002] In today's battery technology field, the battery cover assembly is a key component of the battery housing, and its design is of great importance. It not only needs to protect the sensitive electronic components inside the battery from the influence of the external environment, but also ensure the sealing performance of the battery to prevent the leakage of electrolyte and the harmful intrusion of external impurities. Existing battery cover assemblies are usually made of metal materials or engineering plastics, which are selected because they can provide the necessary mechanical strength and chemical stability. However, in practical applications, there is a common and urgent problem in the design of the pressing block on the battery cover assembly, that is, while the pressing block applies pressure to fix the internal components and maintain the sealing, it often causes the edge of the cover to warp up.

[0003] This warping phenomenon may be the result of a combination of factors. First, when the upper pressure block applies pressure, if the pressure distribution is uneven, the edge parts of the cover may be subjected to excessive force, causing elastic deformation in these areas. Secondly, the materials of the battery cover assembly and the upper pressure block may have differences in thermal expansion coefficients. Under the action of the heat generated when the battery is working, this difference may cause the edge of the cover to warp up. In addition, process problems in the manufacturing and assembly process of the battery cover assembly, such as improper welding, bonding or fastener installation, may also aggravate this phenomenon.

[0004] The upturned edge of the cover not only affects the appearance of the battery, but more importantly, it may cause the battery's sealing performance to deteriorate, thus causing a series of safety issues. Electrolyte leakage may cause battery performance to deteriorate and even cause safety accidents; internal short circuits may directly lead to battery failure; and harmful intrusion of external impurities may accelerate the corrosion of internal battery materials and shorten the battery life. Therefore, solving the problem of the upturned edge caused by the upper pressing block of the battery cover assembly is of vital importance to improving the overall performance of the battery, ensuring safety in use, and extending the battery life. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem of easy warping of the edge of the cover plate in the prior art, and to provide a battery cover plate assembly and a secondary battery.

[0006] In order to solve the above technical problems, the present invention provides a battery cover assembly, which includes: a cover body, on which at least one pressing block assembly area and at least one cover protrusion are provided, and the cover protrusion is arranged corresponding to the pressing block assembly area, wherein the pressing block assembly area is recessed downward from the upper surface of the cover body, and the cover protrusion protrudes from the upper surface of the cover body; at least one pressing component, and the at least one pressing component is correspondingly arranged in the at least one pressing block assembly area, and any of the pressing components includes: A pressing block, wherein a pressing hole is provided on the pressing block, and the pressing hole is placed on one side of the length direction of the pressing block; an upper plastic, wherein the upper plastic is arranged between the cover body and the pressing block, and comprises a clamping portion and an avoidance groove, wherein the clamping portion is arranged at the edge of the upper plastic, and its two sides respectively abut against the cover protrusion and the pressing block, and the cover protrusion is embedded in the avoidance groove to form an expansion space between the cover body and the pressing block; a rivet, wherein the rivet is sequentially penetrated through the pressing hole to connect the pressing block and the upper plastic.

[0007] In one embodiment of the present invention, the pressing assembly further includes an elastic limiting bracket, the elastic limiting bracket is connected to the cover plate body, and the rivet is penetrated and connected to the elastic limiting bracket.

[0008] In one embodiment of the present invention, the rivet comprises an inserting portion, a welding portion and a fixing portion, wherein the inserting portion extends along the thickness direction of the cover body, and is penetrated and connected to the pressure block, the upper plastic and the elastic limiting bracket, and the welding portion extends perpendicular to the inserting portion, one side of which is connected to an end of the inserting portion away from the pressure block, and the other side is connected to the fixing portion, and in the thickness direction of the cover body, the thickness of the fixing portion is smaller than the thickness of the welding portion, so as to form a step surface at the connection between it and the welding portion, and the elastic limiting bracket abuts against the step surface.

[0009] In one embodiment of the present invention, the pressing assembly also includes a sealing ring, which is sleeved on the riveted part. The cover plate body, the elastic limiting bracket and the riveted part jointly enclose an expansion space. The sealing ring is located in the expansion space, and the sealing ring can expand or contract inside the expansion space.

[0010] In one embodiment of the present invention, a plurality of cover plate protrusions are provided on the cover plate body, the protruding height of any cover plate protrusion is smaller than the thickness of the cover plate body, a plurality of cover plate protrusions are correspondingly connected in the pressure block assembly area, or a plurality of cover plate protrusions are correspondingly connected to the periphery of the pressure block assembly area, and the spacing distance between the cover plate protrusions and the pressure block assembly area is greater than a preset distance.

[0011] In one embodiment of the present invention, at least one injection hole is provided on the cover body, and the battery cover assembly further includes at least one sealing assembly, the sealing assembly includes a sealing sheet and a sealing nail, the sealing nail is inserted into the injection hole and connected to the cover body through the sealing sheet.

[0012] In one embodiment of the present invention, the sealing nail includes a guide portion, which is inserted into the liquid injection hole and is provided with at least one helium return groove, which is recessed inward from the edge of the inserting portion to detect the sealing condition of the liquid injection hole through an external suction device.

[0013] In one embodiment of the present invention, the sealing nail further includes a detection portion, which is connected to one end of the guide portion and is provided with a reflective surface, and the reflective surface is arranged to face the external environment so as to detect the position of the sealing nail through a visual detection device.

[0014] In one embodiment of the present invention, at least one injection hole is provided on the cover plate body, and the battery cover plate assembly further includes at least one safety valve assembly, the safety valve assembly includes a safety valve sheet and a safety valve protection cap, the safety valve sheet is connected to the injection hole, the safety valve protection cap is arranged on the safety valve sheet, and is connected to the cover plate body through the circumferential edge of the safety valve sheet.

[0015] The present invention also provides a secondary battery, which includes the above-mentioned battery cover assembly, a shell and a battery cell, wherein the battery cell is arranged inside the shell, and the cover assembly is connected to the opening of the shell, wherein the rivet of the battery cover assembly is connected to the pole piece of the battery cell.

[0016] In one embodiment of the present invention, the welding portion of the riveted component is electrically connected to the pole piece.

[0017] The above technical solution of the present invention has the following advantages compared with the prior art: The battery cover plate assembly and secondary battery described in the present invention fix the internal components of the battery by means of a pressing block, wherein the pressing hole of the pressing block can concentrate the extrusion force on one side of the pressing block. At this time, the end of the cover plate away from the pressing hole will be warped and deformed, so only this end needs to be designed to prevent warping. On this basis, the upper plastic can form a high fit with the cover plate protrusion, thereby providing the cover plate with sufficient expansion draft, thereby achieving the purpose of preventing the cover plate from warping. Compared with the conventional battery cover plate structure at this stage, the present application has the advantages of clever structural design, significant anti-warping effect, easy production and preparation, and improved battery stability, providing new ideas for the research and development and improvement of battery covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of a battery cover assembly in a preferred embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross-section structure at AA in the middle; Figure 3 yes Figure 2 The enlarged structural diagram at B in the middle; Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the riveted parts in the battery cover assembly shown; Figure 5 is a structural schematic diagram of a battery cover assembly in another embodiment of the present invention; Figure 6 is a structural schematic diagram of a battery cover assembly in a third embodiment of the present invention; Figure 7 Schematic diagram of the structure of a secondary battery in a fourth embodiment of the present invention.

[0020] Explanation of the reference numerals in the specification: 100, cover body; 110, injection hole; 120, explosion-proof hole; 140, cover protrusion; 200, pressing assembly; 210, pressing block; 211, pressing hole; 220, upper plastic; 221, clamping part; 222, avoidance groove; 230, sealing ring; 240, elastic limiting bracket; 250, rivet; 251, plug-in part; 252, welding part; 253, fixing part; 260, expansion space; 300, sealing assembly; 310, sealing piece; 320, sealing nail; 321, guiding part; 322, helium return tank; 323, detection part; 400, shell. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0022] See also Figure 1 and Figure 2As shown, this embodiment provides a battery cover assembly, which includes: a cover body 100, on which at least one pressing block assembly area 130 and at least one cover protrusion 140 are provided, and the cover protrusion 140 is arranged corresponding to the pressing block assembly area 130, wherein the pressing block assembly area 130 is recessed downward from the upper surface of the cover body 100, and the cover protrusion 140 protrudes from the upper surface of the cover body 100; at least one pressing component 200, and the at least one pressing component 200 is correspondingly arranged in the at least one pressing block assembly area 130, and any of the pressing components 200 includes: a pressing block 210, on which a pressing hole is provided 211, the pressing hole 211 is placed on one side of the pressing block 210 in the length direction; the upper plastic 220, the upper plastic 220 is arranged between the cover body 100 and the pressing block 210, and includes a clamping portion 221 and an avoidance groove 222, the clamping portion 221 is arranged at the edge of the upper plastic 220, and its two sides respectively abut the cover protrusion 140 and the pressing block 210, and the cover protrusion 140 is embedded in the avoidance groove 222 to form an expansion space between the cover body 100 and the pressing block 210; the rivet 250, the rivet 250 is sequentially penetrated through the pressing hole 211 to connect the pressing block 210 and the upper plastic 220.

[0023] The battery cover assembly described in this embodiment fixes the internal components of the battery through a pressing block 210, wherein the pressing hole 211 of the pressing block 210 can concentrate the extrusion force on one side of the pressing block 210. At this time, the end of the cover away from the pressing hole 211 will be warped and deformed, so only this end needs to be designed to prevent warping. On this basis, the upper plastic 220 can form a high degree of fit with the cover protrusion 140, thereby providing the cover with sufficient expansion draft, thereby achieving the purpose of preventing the cover from warping. Compared with the conventional battery cover structure at this stage, the present application has the advantages of clever structural design, significant anti-warping effect, easy production and preparation, and improved battery stability, providing new ideas for the research and development of battery covers.

[0024] See also Figure 1 and Figure 2 As shown, the battery cover assembly in this embodiment is suitable for square batteries, and two pressing block assembly areas 130 are symmetrically arranged in the length direction thereof, so that two pressing blocks 210 can simultaneously press and fix the internal structure of the battery. Correspondingly, two pressing assemblies 200 are arranged in this embodiment. In addition, in order to improve the supporting strength of the structure in this application, the pressing assembly 200 in this embodiment also includes an elastic limiting bracket 240, which is connected to the cover body 100, and the rivet 250 is penetrated and connected to the elastic limiting bracket 240.

[0025] Furthermore, in this embodiment, the cover body 100 is a symmetrical structure, and its connection relationship with the corresponding press-fit assembly 200 is the same, and one of them is taken as an example for description: Figure 3 As shown, the cover plate protrusion 140 in this embodiment is correspondingly connected to the pressure block assembly area 130, and it matches the corresponding upper plastic 220 structure. When it is pressed to produce a deformation tendency of upward warping, the cover plate protrusion 140 can gradually fill the avoidance groove 222, thereby reducing the overall deformation tendency of the cover plate. At the same time, it can also limit the deformation area around the cover plate protrusion 140 under the action of the clamping portion 221, thereby ensuring the structural stability of the cover plate edge, thereby achieving the purpose of improving the stability and sealing of the battery connection.

[0026] Further, see Figure 3 As shown, in this embodiment, the rivet 250 includes a plug-in portion 251, a welding portion 252 and a fixing portion 253, wherein the plug-in portion 251 extends along the thickness direction of the cover body 100, and is connected to the pressing block 210, the upper plastic 220 and the elastic limiting bracket 240, and the welding portion 252 extends perpendicular to the plug-in portion 251, one side of which is connected to one end of the plug-in portion 251 away from the pressing block 210, and the other side is connected to the fixing portion 253, and in the thickness direction of the cover body 100, the thickness of the fixing portion 253 is less than the thickness of the welding portion 252, so as to form a step surface at the connection between it and the welding portion 252, and the elastic limiting bracket 240 abuts against the step surface. Based on this, the rivet 250 can replace the traditional adapter to achieve the connection of the electrode, thereby further simplifying the internal structure of the battery. Furthermore, the welding portion 252 and the fixing portion 253 in the present embodiment are fixedly connected and are actually integrally arranged. To avoid welding through, the welding portion 252 is arranged as a component with a thicker structure in the present embodiment. Meanwhile, to improve the riveting stability of the riveted part 250 and improve the degree of coordination between the riveted part 250 and other structures, the fixing portion 253 is designed as a component with a thinner structure in the present embodiment. Based on the above structural arrangement, a step surface can be formed between the welding portion 252 and the fixing portion 253 to improve the connection stability between the welding portion 252 and the fixing portion 253 and the elastic limiting bracket 240.

[0027] In order to improve the sealing degree of the cover assembly after assembly, in this embodiment, the press-fit assembly 200 further includes a sealing ring 230, which is sleeved on the rivet 250. The cover body 100, the elastic limit bracket 240 and the rivet 250 jointly enclose an expansion space 260, and the sealing ring 230 is located in the expansion space 260, and the sealing ring 230 can expand or contract inside the expansion space 260. In particular, during the use of the battery, the sealing ring 230 will absorb electrolyte to undergo secondary expansion, so the present application can not only achieve a high degree of sealing of the cover assembly, but also protect the sealing ring 230 and its surrounding structures.

[0028] See also Figure 4 As shown, at least one injection hole 110 is provided on the cover body 100 in this embodiment, and the battery cover assembly further includes at least one sealing assembly 300, the sealing assembly 300 includes a sealing sheet 310 and a sealing nail 320, the sealing nail 320 is inserted into the injection hole 110, and is connected to the cover body 100 through the sealing sheet 310. Among them, the sealing nail 320 includes a guide portion 321, the guide portion 321 is inserted into the injection hole 110, and at least one helium return groove 322 is provided thereon, the helium return groove 322 is recessed inwardly from the edge of the plug-in portion 251, so as to detect the sealing condition of the injection hole 110 through an external suction device. Based on this, the operator can indirectly check the internal sealing condition of the battery by checking the gas passing through the helium return groove 322, and the present invention does not impose specific restrictions on the number of helium return grooves 322 and the actual design position.

[0029] Furthermore, the sealing nail 320 in this embodiment also includes a detection part 323, and the detection part 323 is connected to one end of the guide part 321, and a reflective surface is provided on it. The top of the sealing nail 320 is provided with a reflective surface that gradually extends downward in a direction from the center of the detection part 323 toward the edge of the sealing nail 320, and the reflective surface is arranged toward the external environment to facilitate detection and identification by visual inspection equipment, wherein the angle formed between the reflective surface and the horizontal direction is between 3 and 10°. Specifically, the detection part 323 in this embodiment is preferably a blind groove that is recessed downward from the upper surface of the sealing nail 320, and its surface is uniform and smooth, thereby facilitating the external visual inspection device to detect the specific position of the sealing nail from various angles, thereby judging whether the sealing nail is assembled in place. In this embodiment, the external visual inspection device is preferably a CDD charge coupled device.

[0030] In addition, the cover body 100 of the present embodiment is provided with an explosion-proof hole 120 , and an explosion-proof plate is connected to the explosion-proof hole 120 . Embodiment 2

[0031] See also Figure 5 As shown, the present embodiment provides another battery cover assembly, whose main structure and operating principle are the same as those of the first embodiment, and will not be elaborated here. In the present embodiment, only the design position of the cover protrusion 140 is different from that of the first embodiment, specifically: the cover protrusion 140 in the present embodiment is correspondingly connected to the periphery of the pressing block assembly area 130, and the protruding height of the cover protrusion 140 is less than the thickness of the cover body 100. It should be noted that the cover protrusion 140 in the present embodiment is formed by pressing the cover body. Based on this processing method, in the process of processing and preparing the cover protrusion 140, it is necessary to ensure that the deformation amount of part of the material used to form the cover protrusion will not exceed the material limit. Therefore, based on the limitation on the protruding height of the cover protrusion 140, it can be prevented that the cover body 100 will be tensile damaged or even ruptured during the process of pressing the cover protrusion 140. Furthermore, the spacing distance between the cover plate protrusion 140 and the pressing block assembly area 130 in this embodiment is greater than the preset distance of 1 cm, so that it can provide a pressing platform for the external cover plate protrusion 140 pressing device, thereby avoiding deformation of the material near the pressing block assembly area 130 during the pressing process. Correspondingly, at least part of the pressing block 210 extends to the outside of the pressing block assembly area 130 and is connected to the cover plate protrusion 140, thereby providing another battery cover assembly structure. Embodiment 3

[0032] See also Figure 6 As shown, this embodiment provides another battery cover assembly. In order to improve its anti-warping performance, two cover protrusions 140 are correspondingly arranged in one pressing block assembly area 130 in this embodiment. In different implementations, the cover protrusions 140 can be set to corresponding thickness, quantity and setting position according to actual use requirements, and the present invention does not make specific restrictions on this. Embodiment 4

[0033] See also Figure 7 As shown, this embodiment provides a secondary battery, which includes the battery cover assembly, a shell 400 and a battery cell according to the first embodiment, wherein the battery cell is arranged inside the shell 400, and the cover assembly is connected to the opening of the shell 400, wherein the rivet 250 of the battery cover assembly is connected to the pole piece of the battery cell. The welding portion 252 of the rivet 250 is electrically connected to the pole piece.

[0034] In summary, the battery cover assembly and secondary battery described in the present invention fix the internal components of the battery through the pressing block 210, wherein the pressing hole 211 of the pressing block 210 can concentrate the extrusion force on one side of the pressing block 210. At this time, the end of the cover away from the pressing hole 211 will be warped and deformed, so only this end needs to be designed to prevent warping. On this basis, the upper plastic 220 can form a high degree of fit with the cover protrusion 140, thereby providing the cover with sufficient expansion draft, thereby achieving the purpose of preventing the cover from warping. Compared with the conventional battery cover structure at this stage, the present application has the advantages of clever structural design, significant anti-warping effect, easy production and preparation, and improved battery stability, providing new ideas for the research and development and improvement of battery covers.

[0035] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate body, wherein the cover plate body is provided with at least one pressing block assembly area and at least one cover plate protrusion, and the cover plate protrusion is arranged corresponding to the pressing block assembly area, wherein the pressing block assembly area is recessed downward from the upper surface of the cover plate body, and the cover plate protrusion protrudes from the upper surface of the cover plate body; At least one pressing assembly, wherein the at least one pressing assembly is correspondingly arranged in the at least one pressing block assembly area, and any of the pressing assemblies comprises: A pressing block, wherein the pressing block is provided with a pressing hole, and the pressing hole is located at one side of the pressing block in the length direction; The upper plastic is arranged between the cover body and the pressing block, and comprises a clamping portion and an avoidance groove. The clamping portion is arranged at the edge of the upper plastic, and two sides of the clamping portion respectively abut against the cover protrusion and the pressing block, and the cover protrusion is embedded in the avoidance groove to form an expansion space between the cover body and the pressing block; A rivet is provided through the pressing hole to connect the pressing block and the upper plastic in sequence.

2. The battery cover assembly according to claim 1, characterized in that: The pressing assembly further comprises an elastic limiting bracket, the elastic limiting bracket is connected to the cover plate body, and the rivet is penetrated and connected to the elastic limiting bracket.

3. The battery cover assembly according to claim 2, characterized in that: The rivet comprises an inserting portion, a welding portion and a fixing portion, wherein the inserting portion extends along the thickness direction of the cover body, and is penetrated and connected to the pressure block, the upper plastic and the elastic limiting bracket, and the welding portion extends perpendicular to the inserting portion, one side of which is connected to an end of the inserting portion away from the pressure block, and the other side is connected to the fixing portion, and in the thickness direction of the cover body, the thickness of the fixing portion is less than the thickness of the welding portion, so as to form a step surface at the connection between the fixing portion and the welding portion, and the elastic limiting bracket abuts against the step surface.

4. The battery cover assembly according to claim 2, characterized in that: The pressing assembly also includes a sealing ring, which is sleeved on the riveted part. The cover body, the elastic limiting bracket and the riveted part jointly enclose an expansion space. The sealing ring is located in the expansion space, and the sealing ring can expand or contract inside the expansion space.

5. The battery cover assembly according to claim 1, characterized in that: A plurality of cover plate protrusions are provided on the cover plate body, and the protruding height of any cover plate protrusion is less than the thickness of the cover plate body. A plurality of cover plate protrusions are correspondingly connected in the pressure block assembly area, or a plurality of cover plate protrusions are correspondingly connected to the periphery of the pressure block assembly area, and the spacing distance between the cover plate protrusions and the pressure block assembly area is greater than a preset distance.

6. The battery cover assembly according to claim 1, characterized in that: The cover body is provided with at least one injection hole, and the battery cover assembly further comprises at least one sealing assembly, wherein the sealing assembly comprises a sealing sheet and a sealing nail, wherein the sealing nail is inserted into the injection hole and connected to the cover body via the sealing sheet.

7. The battery cover assembly according to claim 6, characterized in that: The sealing nail includes a guide portion, which is inserted into the injection hole and is provided with at least one helium return groove, which is recessed inward from the edge of the inserting portion so as to detect the sealing condition of the injection hole through an external suction device.

8. The battery cover assembly according to claim 7, characterized in that: The sealing nail further comprises a detection part, which is connected to one end of the guide part and is provided with a reflective surface, and the reflective surface is arranged to face the external environment so as to detect the position of the sealing nail through a visual detection device.

9. A secondary battery, characterized in that: It comprises the battery cover assembly, shell and battery cell as described in any one of claims 1 to 8, wherein the battery cell is arranged inside the shell, and the cover assembly is connected to the opening of the shell, wherein the rivet of the battery cover assembly is connected to the pole piece of the battery cell.

10. The secondary battery according to claim 9, characterized in that: The welding portion of the rivet is electrically connected to the pole piece.

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