Cover plate structure and square battery

Abstract

The utility model provides a cover plate structure and a square battery. The cover plate structure comprises a cover plate body and a lower plastic plate body, the cover plate body is provided with a sinking part, and the sinking part is provided with a first sinking groove; the lower plastic plate body is provided with a second sinking groove, the sinking part is located in the second sinking groove and connected with the lower plastic plate body, and the lower plastic plate body is connected with the cover plate body. The cover plate structure is good in structural strength.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrochemical devices, and in particular to a cover plate structure and a square battery. Background Art

[0002] A square battery is an electrochemical device that is square in shape and can convert chemical energy into electrical energy. Square batteries are widely used in new energy vehicles, smart phones, tablet computers, digital cameras, medical equipment, smart furniture and other fields. A square battery consists of a cover structure and a shell structure, and the cover structure is connected to the shell structure.

[0003] In the prior art, the traditional cover plate structure includes a cover plate body and a lower plastic plate body. The cover plate body is a square flat plate. A sunken groove is opened in the middle of the lower plastic plate body. The cover plate body is covered in the sunken groove and connected to the lower plastic plate body, such as the Chinese patent No. CN202121415529.1.

[0004] However, since the cover body is a flat structure, a sunken groove is opened in the middle of the lower plastic plate body, and the cover body is covered in the sunken groove and connected to the lower plastic plate body, so that the middle part of the cover body is flatly arranged above the sunken groove, so that the middle part of the lower plastic plate body has a poor supporting effect on the middle part of the cover body, so that the rigidity of the middle part of the cover structure is poor, and the middle part of the cover structure is more prone to deformation, which in turn makes the structural strength of the cover structure poor. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cover plate structure and a square battery with good structural strength.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A cover plate structure, comprising:

[0008] The cover plate body is provided with a sinking portion, and the sinking portion is provided with a first sinking groove;

[0009] The lower plastic plate body is provided with a second sinking groove, the sinking portion is located in the second sinking groove and connected to the lower plastic plate body, and the lower plastic plate body is connected to the cover plate body.

[0010] In one of the embodiments, a liquid injection hole and a pressure relief installation hole are formed on the groove wall of the first sunken groove, and a convex rib is provided on the groove wall of the first sunken groove, and the convex rib is located between the liquid injection hole and the pressure relief installation hole; the cover plate structure also includes a pressure relief component, which is passed through the pressure relief installation hole and connected to the sunken part.

[0011] In one of the embodiments, the sinking portion is provided with a sinking slope, and the sinking slope is located in the first sinking groove.

[0012] In one of the embodiments, the convex rib body is provided with a receiving groove, the receiving groove is respectively connected with the first sinking groove and the pressure relief mounting hole, and the pressure relief assembly is located in the receiving groove.

[0013] In one embodiment, the convex rib is in a circular ring shape, a rhombus shape, a parallelogram shape, a rectangular shape, or a triangle shape.

[0014] In one of the embodiments, the lower plastic plate body is further provided with a position-avoiding through hole, and the position-avoiding through hole is connected to the second sunken groove.

[0015] In one embodiment, the cover plate structure also includes a positive electrode column assembly and a negative electrode column assembly, the positive electrode column assembly and the negative electrode column assembly are arranged opposite to each other, the positive electrode column assembly is respectively connected to the cover plate body and the lower plastic plate body, the negative electrode column assembly is respectively connected to the cover plate body and the lower plastic plate body, and the sunken portion is located between the positive electrode column assembly and the negative electrode column assembly.

[0016] In one of the embodiments, the cover plate structure further includes a sealing component, which is penetrated through the liquid injection hole and connected to the sinking portion.

[0017] In one embodiment, the lower plastic plate is an integrally formed structure.

[0018] A square battery comprises a shell structure and a cover plate structure as described in any one of the above embodiments, wherein the cover plate structure is connected to the shell structure.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] Since the cover body is provided with a sinking portion, the sinking portion is located in the middle of the cover body, and the lower plastic plate body is provided with a second sinking groove, the second sinking groove is located in the middle of the lower plastic plate body, the sinking portion is located in the second sinking groove and is connected to the lower plastic plate body, so that the sinking portion is adapted to the second sinking groove, and the sinking portion is tightly fitted with the groove wall of the second sinking groove, thereby solving the problem in the prior art that the middle part of the cover body is flatly arranged above the sinking groove, so that the middle part of the cover body is tightly fitted with the groove wall of the second sinking groove, and the rigidity of the middle part of the cover body is strengthened, that is, the middle part of the cover body is tightly fitted with the middle part of the lower plastic plate body, so that the middle part of the lower plastic plate body has a better supporting effect on the middle part of the cover body, so that the rigidity of the middle part of the cover structure is better, and the middle part of the cover structure is less likely to deform, thereby making the structural strength of the cover structure better. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic structural diagram of a cover plate structure according to an embodiment;

[0023] Figure 2 for Figure 1 An enlarged schematic diagram of the cover plate structure at point A is shown;

[0024] Figure 3 for Figure 1 A schematic diagram of the three-dimensional exploded structure of the cover structure shown. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] The present disclosure provides a cover plate structure, including a cover plate body and a lower plastic plate body; the cover plate body is provided with a sinking portion, and the sinking portion is provided with a first sinking groove; the lower plastic plate body is provided with a second sinking groove, the sinking portion is located in the second sinking groove and is connected to the lower plastic plate body, and the lower plastic plate body is connected to the cover plate body.

[0029] The above-mentioned cover plate structure is that the cover plate body is provided with a sinking part, the sinking part is located in the middle part of the cover plate body, and the lower plastic plate body is provided with a second sinking groove, the second sinking groove is located in the middle part of the lower plastic plate body, the sinking part is located in the second sinking groove and is connected to the lower plastic plate body, so that the sinking part is adapted to the second sinking groove, and the sinking part is tightly fitted with the groove wall of the second sinking groove, thereby solving the problem of the middle part of the cover plate body being flatly arranged above the sinking groove in the prior art, so that the middle part of the cover plate body is tightly fitted with the groove wall of the second sinking groove, and the rigidity of the middle part of the cover plate body is strengthened, that is, the middle part of the cover plate body is tightly fitted with the middle part of the lower plastic plate body, so that the middle part of the lower plastic plate body has a better supporting effect on the middle part of the cover plate body, so that the rigidity of the middle part of the cover plate structure is better, so that the middle part of the cover plate structure is less likely to deform, and thus the structural strength of the cover plate structure is better.

[0030] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0031] like Figures 1 to 3 As shown, a cover plate structure 10 of an embodiment includes a cover plate body 100 and a lower plastic plate body 300; the cover plate body 100 is provided with a sinking portion 110, and the sinking portion 110 is provided with a first sinking groove 111; the lower plastic plate body 300 is provided with a second sinking groove 310, the sinking portion 110 is located in the second sinking groove 310 and is connected to the lower plastic plate body 300, and the lower plastic plate body 300 is connected to the cover plate body 100.

[0032] In this embodiment, the sinking portion 110 is located in the middle of the cover body 100. The second sinking groove 310 is located in the middle of the lower plastic plate body 300. The sinking portion 110 is located in the second sinking groove 310 and connected to the lower plastic plate body 300 so that the sinking portion 110 is adapted to the second sinking groove 310.

[0033] In the above-mentioned cover plate structure 10, since the cover plate body 100 is provided with a sinking portion 110, the sinking portion 110 is located in the middle of the cover plate body 100, and the lower plastic plate body 300 is provided with a second sinking groove 310, the second sinking groove 310 is located in the middle of the lower plastic plate body 300, and the sinking portion 110 is located in the second sinking groove 310 and connected to the lower plastic plate body 300, so that the sinking portion 110 is adapted to the second sinking groove 310, so that the sinking portion 110 is closely fitted with the groove wall of the second sinking groove 310, thereby solving the problem of the cover plate structure in the prior art. The middle part of the cover body 100 is laid flat on the top of the sunken groove, so that the middle part of the cover body 100 is tightly fitted with the groove wall of the second sunken groove 310, thereby strengthening the rigidity of the middle part of the cover body 100, that is, the middle part of the cover body 100 is tightly fitted with the middle part of the lower plastic plate body 300, so that the middle part of the lower plastic plate body 300 has a better supporting effect on the middle part of the cover body 100, so that the rigidity of the middle part of the cover structure 10 is better, and the middle part of the cover structure 10 is less likely to deform, thereby making the structural strength of the cover structure 10 better.

[0034] like Figures 1 to 3 As shown, in one embodiment, the groove wall of the first sinking groove 111 is provided with a liquid injection hole 1111 and a pressure relief installation hole 1112, and the groove wall of the first sinking groove 111 is provided with a convex rib 1113, and the convex rib 1113 is located between the liquid injection hole 1111 and the pressure relief installation hole 1112; the cover plate structure 10 also includes a pressure relief component 200, which is penetrated through the pressure relief installation hole 1112 and connected to the sinking part 110. In this embodiment, the pressure relief component 200 is an explosion-proof valve or a pressure relief valve.

[0035] Furthermore, since the sinking portion 110 is provided with a first sinking groove 111, the groove wall of the first sinking groove 111 is provided with a liquid injection hole 1111 and a pressure relief mounting hole 1112, the pressure relief assembly 200 is penetrated through the pressure relief mounting hole 1112 and connected to the sinking portion 110, so that the liquid injection hole 1111 and the pressure relief assembly 200 are both arranged on the groove wall of the first sinking groove 111; during the process of liquid injection of the square battery, the electrolyte remaining outside the liquid injection hole 1111 is retained in the first sinking groove 111, so that the residual electrolyte is difficult to flow to the outer surface of the cover body 100, and the residual electrolyte is difficult to flow to the outer surface of the pole assembly, thereby reducing the short circuit risk of the square battery.

[0036] Furthermore, since the pressure relief assembly 200 is disposed on the groove wall of the first sinking groove 111, the pressure relief assembly 200 sinks along with the sinking portion 110, so that the gas pressure relief path of the square battery becomes shorter, reducing the risk of thermal runaway of the square battery.

[0037] Furthermore, since the groove wall of the first sunken groove 111 is provided with a convex rib 1113, the convex rib 1113 is located between the injection hole 1111 and the pressure relief mounting hole 1112, so that the convex rib 1113 is used to block the residual electrolyte from flowing from the injection hole 1111 to the pressure relief assembly 200, thereby reducing the risk of the residual electrolyte contaminating the pressure relief assembly 200.

[0038] like Figures 1 to 3 As shown, in one embodiment, the sinking portion 110 is provided with a sinking slope 112 , and the sinking slope 112 is located in the first sinking groove 111 .

[0039] like Figures 1 to 3 As shown, in one embodiment, the convex rib body 1113 is provided with a receiving groove 1113a, which is respectively connected to the first sunken groove 111 and the pressure relief mounting hole 1112, and the pressure relief assembly 200 is located in the receiving groove 1113a, so that the convex rib body 1113 can better block the residual electrolyte from flowing from the injection hole 1111 to the pressure relief assembly 200.

[0040] like Figures 1 to 3 As shown, in one embodiment, the convex rib body 1113 is in a circular ring shape, a rhombus shape, a parallelogram shape, a rectangular shape, or a triangle shape.

[0041] like Figure 3 As shown, in one of the embodiments, the lower plastic plate 300 is further provided with an avoidance hole 320, which is connected to the second sunken groove 310, so that the gas generated inside the square battery can reach the pressure relief component 200 along the avoidance hole 320 and the second sunken groove 310, thereby facilitating the pressure relief component 200 to relieve the pressure on the square battery.

[0042] like Figure 1 and Figure 3 As shown, in one embodiment, the cover structure 10 also includes a positive electrode column assembly 400 and a negative electrode column assembly 500, the positive electrode column assembly 400 and the negative electrode column assembly 500 are arranged opposite to each other, the positive electrode column assembly 400 is respectively connected to the cover body 100 and the lower plastic plate body 300, the negative electrode column assembly 500 is respectively connected to the cover body 100 and the lower plastic plate body 300, and the sinking portion 110 is located between the positive electrode column assembly 400 and the negative electrode column assembly 500.

[0043] like Figures 1 to 3 As shown, in one embodiment, the cover plate structure 10 further includes a sealing assembly 600, which is disposed through the injection hole 1111 and connected to the sinking portion 110. In this embodiment, the sealing assembly 600 is a sealing nail structure.

[0044] In one embodiment, the lower plastic plate body 300 is an integrally formed structure, so that the structural strength of the lower plastic plate body 300 is relatively high.

[0045] The present disclosure further provides a square battery, comprising a shell structure and a cover plate structure 10 according to any one of the above embodiments, wherein the cover plate structure 10 is connected to the shell structure.

[0046] Compared with the prior art, the present invention has at least the following advantages:

[0047] Since the cover body 100 is provided with a sinking portion 110, the sinking portion 110 is located in the middle of the cover body 100, the lower plastic plate body 300 is provided with a second sinking groove 310, the second sinking groove 310 is located in the middle of the lower plastic plate body 300, the sinking portion 110 is located in the second sinking groove 310 and connected to the lower plastic plate body 300, so that the sinking portion 110 is adapted to the second sinking groove 310, so that the sinking portion 110 is closely fitted with the groove wall of the second sinking groove 310, thereby solving the problem of the cover body 100 in the prior art. The middle part is laid flat on the top of the sunken groove, so that the middle part of the cover body 100 is tightly fitted with the groove wall of the second sunken groove 310, and the rigidity of the middle part of the cover body 100 is strengthened, that is, the middle part of the cover body 100 is tightly fitted with the middle part of the lower plastic plate body 300, so that the middle part of the lower plastic plate body 300 has a better supporting effect on the middle part of the cover body 100, so that the rigidity of the middle part of the cover structure 10 is better, and the middle part of the cover structure 10 is less likely to deform, thereby making the structural strength of the cover structure 10 better.

[0048] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A cover plate structure, characterized in that: include: The cover plate body is provided with a sinking portion, and the sinking portion is provided with a first sinking groove; The lower plastic plate body is provided with a second sinking groove, the sinking portion is located in the second sinking groove and connected to the lower plastic plate body, and the lower plastic plate body is connected to the cover plate body.

2. The cover plate structure according to claim 1, characterized in that: The groove wall of the first sunken groove is provided with a liquid injection hole and a pressure relief installation hole, and the groove wall of the first sunken groove is provided with a convex rib body, and the convex rib body is located between the liquid injection hole and the pressure relief installation hole; the cover plate structure also includes a pressure relief component, and the pressure relief component is passed through the pressure relief installation hole and connected to the sinking part.

3. The cover plate structure according to claim 1, characterized in that: The sinking portion is provided with a sinking inclined surface, and the sinking inclined surface is located in the first sinking groove.

4. The cover plate structure according to claim 2, characterized in that: The convex rib body is provided with a receiving groove, and the receiving groove is communicated with the first sinking groove and the pressure relief installation hole respectively, and the pressure relief assembly is located in the receiving groove.

5. The cover plate structure according to claim 2, characterized in that: The convex rib body is in a circular ring shape, a rhombus shape, a parallelogram shape, a rectangular shape or a triangle shape.

6. The cover plate structure according to claim 1, characterized in that: The lower plastic plate body is also provided with a position-avoiding through hole, and the position-avoiding through hole is communicated with the second sinking groove.

7. The cover plate structure according to claim 1, characterized in that: The cover plate structure also includes a positive electrode column assembly and a negative electrode column assembly, the positive electrode column assembly is arranged opposite to the negative electrode column assembly, the positive electrode column assembly is respectively connected to the cover plate body and the lower plastic plate body, the negative electrode column assembly is respectively connected to the cover plate body and the lower plastic plate body, and the sinking portion is located between the positive electrode column assembly and the negative electrode column assembly.

8. The cover plate structure according to claim 2, characterized in that: The cover plate structure also includes a sealing component, which is penetrated through the liquid injection hole and connected to the sinking part.

9. The cover plate structure according to claim 1, characterized in that: The lower plastic plate body is an integrally formed structure.

10. A square battery, characterized in that: It comprises a shell structure and the cover plate structure according to any one of claims 1 to 9, wherein the cover plate structure is connected to the shell structure.

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