Battery cover plate assembly and secondary battery

Abstract

The application provides a battery cover plate assembly and a secondary battery, which comprises a cover plate body provided with a pressing block assembly area and a cover plate protrusion; and a pressing assembly corresponding to the pressing block assembly area, wherein any pressing assembly comprises a pressing block provided with a pressing hole on one side in the length direction of the pressing block; an upper plastic comprising a clamping portion and a clearance groove, the clamping portion being arranged at the edge of the upper plastic, the two sides of the clamping portion abutting against the cover plate protrusion and the pressing block respectively, and the cover plate protrusion being embedded in the clearance groove; and a riveting piece sequentially penetrating through the pressing block and the upper plastic through the pressing hole. The application can form a high cooperation with the cover plate protrusion, thereby providing sufficient expansion draft for the cover plate, and achieving the purpose of preventing the cover plate from warping. Compared with the conventional battery cover plate structure at the present stage, the application has the advantages of ingenious structure design, remarkable anti-warping effect, convenient production and preparation, and improved battery use stability.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a battery cover assembly and a secondary battery. Background Technology

[0002] In today's battery technology field, the battery cover assembly, as a key component of the battery casing, is undeniably crucial in its design. It not only needs to protect the sensitive electronic components inside the battery from external environmental influences but also ensure the battery's sealing performance, preventing electrolyte leakage and harmful intrusion of external impurities. Existing battery cover assemblies are typically made of metal or engineering plastics, chosen for their ability to provide the necessary mechanical strength and chemical stability. However, in practical applications, a common and pressing problem exists in the design of the clamping blocks on the battery cover assembly: while applying pressure to secure the internal components and maintain a seal, the clamping blocks often cause the cover edges to warp upwards.

[0003] This upward warping phenomenon is likely the result of several factors. First, if the pressure distribution is uneven when the upper pressure block applies pressure, the edges of the cover plate may bear excessive force, causing elastic deformation in these areas. Second, the materials of the battery cover plate assembly and the upper pressure block may differ in their coefficients of thermal expansion. Under the heat generated during battery operation, this difference may cause the cover plate edges to warp upwards. Furthermore, manufacturing and assembly process issues in the battery cover plate assembly, such as improper welding, bonding, or fastener installation, may also exacerbate this phenomenon.

[0004] Upward-curving edges on the battery cover not only affect the battery's appearance, but more importantly, they can degrade the battery's sealing performance, leading to a series of safety issues. Electrolyte leakage can cause battery performance degradation and even safety accidents; internal short circuits can directly cause battery failure; and harmful intrusion of external impurities can accelerate the corrosion of internal battery materials, shortening battery life. Therefore, resolving the issue of upward-curving edges caused by the pressure block on the battery cover assembly is crucial for improving overall battery performance, ensuring safety, and extending 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] To solve the above-mentioned technical problems, the present invention provides a battery cover assembly, comprising: a cover body, wherein the cover body is provided with at least one pressing block assembly area and at least one cover protrusion, the cover protrusion being correspondingly disposed with respect 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 is protruding from the upper surface of the cover body; and at least one pressing component, wherein the at least one pressing component is correspondingly disposed in the at least one pressing block assembly area, and any pressing component includes: A pressing block, which has a pressing hole located on one side along its length; an upper plastic, which is disposed between the cover plate body and the pressing block, and includes a snap-fit ​​part and a relief groove. The snap-fit ​​part is located at the edge of the upper plastic and abuts against the cover plate protrusion and the pressing block on both sides, and the cover plate protrusion is embedded in the relief groove to form an expansion space between the cover plate body and the pressing block; and a riveting member, which passes through the pressing hole to sequentially 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 being connected to the cover plate body, and the riveting member being threaded through and connected to the elastic limiting bracket.

[0008] In one embodiment of the present invention, the riveting member includes an insertion portion, a welding portion, and a fixing portion. The insertion portion extends along the thickness direction of the cover plate body and passes through and connects the pressure block, the upper plastic, and the elastic limiting bracket. The welding portion extends perpendicularly to the insertion portion, with one side connected to the end of the insertion portion away from the pressure block and the other side connected to the fixing portion. In the thickness direction of the cover plate body, the thickness of the fixing portion is less than the thickness of the welding portion, so as to form a stepped surface at the connection between the fixing portion and the welding portion. The elastic limiting bracket abuts against the stepped surface.

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

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

[0011] In one embodiment of the present invention, the cover plate body is provided with at least one liquid injection hole, and the battery cover plate assembly further includes at least one sealing assembly. The sealing assembly includes a sealing piece and a sealing pin. The sealing pin is inserted into the liquid injection hole and connected to the cover plate body through the sealing piece.

[0012] In one embodiment of the present invention, the sealing pin includes a guide portion, which is inserted into the injection hole and has at least one helium return groove thereon. The helium return groove is recessed inward from the edge of the insertion portion to detect the sealing condition of the injection hole by an external suction device.

[0013] In one embodiment of the present invention, the sealing nail further includes a detection part, which is connected to one end of the guide part and has a reflective surface. The reflective surface is set to the external environment so as to detect the position of the sealing nail by a visual inspection device.

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

[0015] The present invention also provides a secondary battery, which includes the above-mentioned battery cover assembly, housing and battery cell, wherein the battery cell is disposed inside the housing, the cover assembly is connected to the opening of the housing, and the riveting members of the battery cover assembly are connected to the electrode of the battery cell.

[0016] In one embodiment of the present invention, the welded portion of the riveting member is electrically connected to the electrode plate.

[0017] The technical solution of the present invention has the following advantages compared with the prior art: The battery cover assembly and secondary battery described in this invention use a pressure block to fix the internal components of the battery. The pressure hole of the pressure block concentrates the compressive force on one side of the pressure block. At this point, the end of the cover plate furthest from the pressure hole will warp and deform. Therefore, anti-warping design is only needed for this end. Furthermore, the upper plastic layer can form a high-fit with the cover plate protrusions, thereby providing sufficient draft allowance for the cover plate and achieving the purpose of preventing warping. Compared with conventional battery cover structures at present, this application has advantages such as ingenious structural design, significant anti-warping effect, ease of production and manufacturing, and improved battery stability, providing new ideas for the research and improvement of battery covers. Attached Figure Description

[0018] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural diagram of the battery cover assembly in a preferred embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 yes Figure 2 Enlarged structural diagram at point B; Figure 4 yes Figure 1 A three-dimensional structural diagram of the riveting components in the battery cover assembly shown. Figure 5 This is a schematic diagram of the battery cover assembly in another embodiment of the present invention; Figure 6 This is a schematic diagram of the battery cover assembly in the third embodiment of the present invention; Figure 7 This is a schematic diagram of the secondary battery structure in the fourth embodiment of the present invention.

[0020] Explanation of reference numerals in the accompanying drawings: 100, cover plate body; 110, injection hole; 120, explosion-proof hole; 140, cover plate protrusion; 200, pressing assembly; 210, pressing block; 211, pressing hole; 220, upper plastic; 221, snap-fit ​​part; 222, clearance groove; 230, sealing ring; 240, elastic limit bracket; 250, riveting part; 251, insertion part; 252, welding part; 253, fixing part; 260, expansion space; 300, sealing assembly; 310, sealing piece; 320, sealing pin; 321, guide part; 322, helium return tank; 323, detection part; 400, housing. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Example 1

[0022] See Figure 1 and Figure 2As shown, this embodiment provides a battery cover assembly, which includes: a cover body 100, wherein the cover body 100 is provided with at least one pressing block assembly area 130 and at least one cover protrusion 140, the cover protrusion 140 being correspondingly disposed with respect 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; and at least one pressing component 200, wherein the at least one pressing component 200 is correspondingly disposed in the at least one pressing block assembly area 130, and any pressing component 200 includes: a pressing block 210, wherein the pressing block 210 is provided with a pressing hole. 211, the pressing hole 211 is located on one side of the pressing block 210 along its length; upper plastic 220, the upper plastic 220 is disposed between the cover plate body 100 and the pressing block 210, it includes a snap-fit ​​part 221 and a relief groove 222, the snap-fit ​​part 221 is disposed on the edge of the upper plastic 220, its two sides respectively abut against the cover plate protrusion 140 and the pressing block 210, and the cover plate protrusion 140 is embedded in the relief groove 222 to form an expansion space between the cover plate body 100 and the pressing block 210; riveting member 250, the riveting member 250 passes through the pressing hole 211 and sequentially connects the pressing block 210 and the upper plastic 220.

[0023] The battery cover assembly described in this embodiment uses a pressure block 210 to fix the internal components of the battery. The pressing hole 211 of the pressure block 210 concentrates the compressive force on one side of the pressure block 210. At this time, the end of the cover away from the pressing hole 211 will warp and deform. Therefore, anti-warping design is only needed for this end. Furthermore, the upper plastic 220 can form a high fit with the cover protrusion 140, thereby providing sufficient draft allowance for the cover and achieving the purpose of preventing cover warping. Compared with the conventional battery cover structure at present, this application has advantages such as ingenious structural design, significant anti-warping effect, ease of production and preparation, and improved battery stability, providing new ideas for the research and improvement of battery covers.

[0024] See Figure 1 and Figure 2 As shown, the battery cover assembly in this embodiment is suitable for square batteries. It has two symmetrically arranged pressing block assembly areas 130 along its length, allowing the two pressing blocks 210 to simultaneously press and fix the internal structure of the battery. Correspondingly, this embodiment has two pressing components 200. Furthermore, to improve the supporting strength of the structure in this application, the pressing component 200 in this embodiment also includes an elastic limiting bracket 240. The elastic limiting bracket 240 is connected to the cover body 100, and the riveting member 250 passes through and connects to the elastic limiting bracket 240.

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

[0026] Further, see Figure 3 As shown, in this embodiment, the riveting component 250 includes an insertion portion 251, a welding portion 252, and a fixing portion 253. The insertion portion 251 extends along the thickness direction of the cover plate body 100, passing through and connecting the pressure block 210, the upper plastic 220, and the elastic limiting bracket 240. The welding portion 252 extends perpendicularly to the insertion portion 251, with one side connected to the end of the insertion portion 251 away from the pressure block 210, and the other side connected to the fixing portion 253. In the thickness direction of the cover plate body 100, the thickness of the fixing portion 253 is less than the thickness of the welding portion 252, forming a stepped surface at its connection with the welding portion 252. The elastic limiting bracket 240 abuts against this stepped surface. Based on this, the riveting component 250 can replace traditional adapter pieces to connect electrodes, thereby further simplifying the internal structure of the battery. Furthermore, in this embodiment, the welding part 252 and the fixing part 253 are fixedly connected and are actually integrally formed. In order to avoid the phenomenon of weld burn-through, the welding part 252 is set as a component with a thicker structure. At the same time, in order to improve the riveting stability of the riveting part 250 and improve its fit with other structures, the fixing part 253 is designed as a component with a thinner structure. Based on the above structural settings, a stepped surface can also be formed between the welding part 252 and the fixing part 253 to improve the connection stability with the elastic limiting bracket 240.

[0027] To improve the sealing performance of the assembled cover assembly, in this embodiment, the pressing assembly 200 further includes a sealing ring 230. The sealing ring 230 is sleeved on the riveting member 250. The cover body 100, the elastic limiting bracket 240, and the riveting member 250 together enclose an expansion space 260. The sealing ring 230 is located in the expansion space 260 and can expand or contract within the expansion space 260. Especially during battery use, the sealing ring 230 absorbs electrolyte and undergoes secondary expansion. Therefore, this application not only achieves a high degree of sealing performance of the cover assembly but also provides protection for the sealing ring 230 and its surrounding structures.

[0028] See Figure 4 As shown, the cover plate body 100 in this embodiment is provided with at least one liquid injection hole 110. The battery cover plate assembly also includes at least one sealing assembly 300. The sealing assembly 300 includes a sealing piece 310 and a sealing pin 320. The sealing pin 320 is inserted into the liquid injection hole 110 and connected to the cover plate body 100 through the sealing piece 310. The sealing pin 320 includes a guide portion 321, which is inserted into the liquid injection hole 110 and has at least one helium return groove 322. The helium return groove 322 is recessed inward from the edge of the insertion portion 251 to allow for detection of the sealing condition of the liquid injection hole 110 by an external suction device. Based on this, the operator can indirectly inspect the internal sealing condition of the battery by observing the gas flow through the helium return groove 322. This invention does not impose specific limitations on the number or actual design location of the helium return grooves 322.

[0029] Furthermore, the sealing nail 320 in this embodiment also includes a detection part 323, which is connected to one end of the guide part 321 and has a reflective surface. The top of the sealing nail 320 has a reflective surface that gradually slopes downwards from the center of the detection part 323 towards the edge of the sealing nail 320. The reflective surface is positioned towards the external environment to facilitate detection and identification by a visual inspection device. The angle 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 recessed downwards from the upper surface of the sealing nail 320, with a uniform and smooth surface. This facilitates the external visual inspection device to detect the specific position of the sealing nail from various angles, thereby determining whether the sealing nail is properly assembled. In this embodiment, the external visual inspection device is preferably a CDD charge-coupled device.

[0030] In addition, the cover plate body 100 of this embodiment is provided with an explosion-proof hole 120, and an explosion-proof sheet is connected in the explosion-proof hole 120. Example 2

[0031] See Figure 5 As shown, this embodiment provides another battery cover assembly, whose main structure and operating principle are the same as those of Embodiment 1, and will not be described in detail here. In this embodiment, only the design position of the cover protrusion 140 is different from that of Embodiment 1. Specifically, the cover protrusion 140 in this embodiment is connected to the periphery of the pressing block assembly area 130, and the protrusion 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 this embodiment is formed by pressing the cover body. Based on this processing method, it is necessary to ensure that the deformation of the material used to form the cover protrusion does not exceed the material limit during the processing of the cover protrusion 140. Therefore, the limitation on the protrusion height of the cover protrusion 140 can prevent the cover body 100 from being subjected to tensile damage or even cracking during the pressing of the cover protrusion 140. Furthermore, in this embodiment, the distance between the cover plate protrusion 140 and the pressing block assembly area 130 is greater than a preset distance of 1 cm. This provides a pressing platform for the external cover plate protrusion 140 pressing device, thereby preventing material deformation near the pressing block assembly area 130 during the pressing process. Correspondingly, at least a portion of the pressing block 210 extends outside the pressing block assembly area 130 and connects to the cover plate protrusion 140, thus providing another battery cover plate assembly structure. Example 3

[0032] See Figure 6 As shown, this embodiment provides another battery cover assembly. To improve its anti-tilting performance, two cover protrusions 140 are correspondingly provided in one pressing block assembly area 130 of this embodiment. In different embodiments, the cover protrusions 140 can be set with corresponding thickness, number and setting position according to actual use requirements, and the present invention does not impose specific limitations on this. Example 4

[0033] See Figure 7 As shown, this embodiment provides a secondary battery, which includes the battery cover assembly, housing 400, and battery cell described in Embodiment 1. The battery cell is disposed inside the housing 400, and the cover assembly is connected to the opening of the housing 400. The riveting member 250 of the battery cover assembly is connected to the electrode of the battery cell. The welding portion 252 of the riveting member 250 is electrically connected to the electrode.

[0034] In summary, the battery cover assembly and secondary battery described in this invention use a pressure block 210 to fix the internal components of the battery. The pressure hole 211 of the pressure block 210 concentrates the compressive force on one side of the pressure block 210. At this point, the end of the cover away from the pressure hole 211 will warp and deform. Therefore, anti-warping design is only needed for this end. Furthermore, the upper plastic 220 can form a high fit with the cover protrusion 140, thereby providing sufficient draft allowance for the cover and achieving the purpose of preventing cover warping. Compared with conventional battery cover structures at present, this application has advantages such as ingenious structural design, significant anti-warping effect, ease of production and preparation, and improved battery stability, providing new ideas for the research and improvement of battery covers.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A battery cover assembly, characterized in that: include: The cover plate body has at least one pressing block assembly area and at least one cover plate protrusion. The cover plate protrusion is correspondingly arranged with the pressing block assembly area. 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 component, wherein the at least one pressing component is correspondingly disposed in the at least one pressing block assembly area, and any pressing component includes: A pressing block, wherein the pressing block is provided with a pressing hole, the pressing hole being located on one side along the length direction of the pressing block; An upper plastic is disposed between the cover plate body and the pressing block. The upper plastic includes a snap-fit ​​part and a clearance groove. The snap-fit ​​part and the clearance groove are only disposed on the edge of the upper plastic away from the pressing hole. The cover plate protrusion is embedded in the clearance groove so that it is also located on the edge of the upper plastic away from the pressing hole. The two sides of the snap-fit ​​part abut against the side of the cover plate protrusion and the pressing block respectively to form an expansion space between the cover plate body and the pressing block. An elastic limiting bracket is connected to the cover plate body; A riveting component, wherein the riveting component is sequentially connected to the pressure block and the upper plastic through the pressing hole, and is connected to the elastic limiting bracket; The riveting component includes an insertion part, a welding part, and a fixing part. The insertion part extends along the thickness direction of the cover plate body and passes through and connects the pressure block, the upper plastic, and the elastic limiting bracket. The welding part extends perpendicularly to the insertion part, with one side connected to the end of the insertion part away from the pressure block and the other side connected to the fixing part. In the thickness direction of the cover plate body, the thickness of the fixing part is less than the thickness of the welding part, so as to form a stepped surface at the connection between the fixing part and the welding part. The elastic limiting bracket abuts against the stepped surface.

2. The battery cover assembly according to claim 1, characterized in that: The pressing assembly also includes a sealing ring, which is sleeved on the riveting member. The cover plate body, the elastic limiting bracket, and the riveting member together enclose an expansion space. The sealing ring is located in the expansion space and can expand or contract inside the expansion space.

3. The battery cover assembly according to claim 1, characterized in that: The cover plate body is provided with a plurality of cover plate protrusions, the protrusion height of any cover plate protrusion is less than the thickness of the cover plate body, the plurality of cover plate protrusions are correspondingly connected in the pressing block assembly area, or the plurality of cover plate protrusions are correspondingly connected to the periphery of the pressing block assembly area, and the interval distance between them and the pressing block assembly area is greater than a preset distance.

4. The battery cover assembly according to claim 1, characterized in that: The cover plate body is provided with at least one liquid injection hole, and the battery cover plate assembly further includes at least one sealing assembly. The sealing assembly includes a sealing piece and a sealing pin. The sealing pin is inserted into the liquid injection hole and is connected to the cover plate body through the sealing piece.

5. The battery cover assembly according to claim 4, characterized in that: The sealing pin includes a guide portion, which is inserted into the injection hole and has at least one helium return groove. The helium return groove is recessed inward from the edge of the insertion portion to detect the sealing condition of the injection hole by an external suction device.

6. The battery cover assembly according to claim 5, characterized in that: The sealing nail also includes a detection unit connected to one end of the guide unit, which has a reflective surface. The reflective surface is set to the external environment so as to detect the position of the sealing nail by a visual inspection device.

7. A secondary battery, characterized in that: The battery includes a battery cover assembly, a housing, and a battery cell as described in any one of claims 1 to 6, wherein the battery cell is disposed inside the housing, and the cover assembly is connected to an opening in the housing, wherein the riveting members of the battery cover assembly are connected to the electrode plates of the battery cell.

8. The secondary battery according to claim 7, characterized in that: The welded portion of the riveted component is electrically connected to the electrode plate.

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