Cover plate assembly, top cover and square battery with explosion-proof valve

Abstract

The utility model provides a cover plate assembly with an explosion-proof valve, a top cover and a square battery. A cover plate assembly with an explosion-proof valve comprises a cover plate, an explosion-proof valve and a protective sheet. The cover plate is provided with a pressure relief hole, and the side wall of the pressure relief hole comprises a first step and a second step arranged in sequence along its axial direction, the first step and the second step are both annular, and the aperture of the second step is larger than the aperture of the first step. The explosion-proof valve is provided with a fixing ring along its circumference, the fixing ring is arranged in the hole surrounded by the second step, the bottom surface of the fixing ring abuts against the top surface of the first step, and the fixing ring is welded to the second step. The protective sheet covers the pressure relief hole, the second step is located between the protective sheet and the first step, and the explosion-proof valve is spaced apart from the protective sheet. The top cover and the square battery comprise the above-mentioned cover plate assembly with an explosion-proof valve. The cover plate assembly, the top cover and the square battery with an explosion-proof valve of the utility model facilitate the welding of the explosion-proof valve, and improve the processing efficiency and welding quality.

Description

Technical Field

[0001] The utility model relates to the technical field of square batteries, and in particular to a cover plate assembly with an explosion-proof valve, a top cover and a square battery. Background Art

[0002] With the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, etc., which provides a broad space for the application and development of lithium batteries. Among them, the lithium batteries used in power tools and electric vehicles are generally called square batteries.

[0003] The square battery in the prior art usually includes a top cover and a shell. The top cover includes a cover plate assembly and a bracket. The cover plate assembly includes a cover plate and an explosion-proof valve. The cover plate is provided with a pressure relief hole, and the explosion-proof valve is welded in the pressure relief hole. The structure of the pressure relief hole makes the operation of welding the explosion-proof valve extremely unstable and easily leads to poor welding.

[0004] Therefore, it is necessary to provide a cover plate assembly, a top cover and a square battery with an explosion-proof valve to solve the above technical problems. Utility Model Content

[0005] The utility model provides a cover plate assembly with an explosion-proof valve, a top cover and a square battery, which facilitates welding of the explosion-proof valve and improves processing efficiency and welding quality.

[0006] The technical solution of the utility model is:

[0007] A cover plate assembly with an explosion-proof valve, comprising:

[0008] A cover plate, which is provided with a pressure relief hole, wherein the side wall of the pressure relief hole comprises a first step and a second step arranged in sequence along the axial direction thereof, wherein the first step and the second step are both annular, and the aperture of the second step is larger than the aperture of the first step;

[0009] An explosion-proof valve, wherein a fixing ring is arranged along the circumference of the explosion-proof valve, the fixing ring is arranged in the hole surrounded by the second step, the bottom surface of the fixing ring abuts against the top surface of the first step, and the fixing ring is welded to the second step; and,

[0010] A protection sheet covers the pressure relief hole, the second step is located between the protection sheet and the first step, and the explosion-proof valve is spaced apart from the protection sheet.

[0011] In the cover plate assembly with explosion-proof valve described in the utility model, the top surface of the fixing ring is flush with the top surface of the second step.

[0012] In the cover plate assembly with explosion-proof valve described in the utility model, the width of the top surface of the first step is 1.5-2.5 times the thickness of the fixing ring.

[0013] In the cover plate assembly with an explosion-proof valve described in the utility model, the side wall of the pressure relief hole also includes an annular third step and a fourth step along its axial direction, the third step is connected to the second step, the aperture of the third step is larger than the aperture of the second step, the fourth step is connected to the third step, the aperture of the fourth step is larger than the aperture of the third step, the protective sheet is arranged on the top surface of the third step, and the side surface of the protective sheet abuts against the side surface of the fourth step.

[0014] In the cover plate assembly with explosion-proof valve described in the utility model, the top surface of the protection sheet is flush with the top surface of the fourth step.

[0015] In the cover plate assembly with explosion-proof valve described in the utility model, the height of the third step is greater than the height of the second step.

[0016] In the cover plate assembly with explosion-proof valve described in the utility model, the protection sheet is made of plastic material, and the peripheral bottom surface of the protection sheet is bonded to the top surface of the third step.

[0017] In the cover plate assembly with explosion-proof valve described in the utility model, the width of the top surface of the third step is 4-6 times the thickness of the protection sheet.

[0018] Another technical solution of the utility model is:

[0019] A top cover, comprising:

[0020] The above-mentioned cover plate assembly with explosion-proof valve; and

[0021] The bracket is connected to the bottom of the cover plate, the bracket is provided with a groove, the bracket is convex downward at the groove, the groove is located below the pressure relief hole, and the bottom of the groove is provided with an exhaust hole.

[0022] Another technical solution of the utility model is:

[0023] A square battery, comprising:

[0024] the top cover as mentioned above; and

[0025] The outer shell is provided with the top cover at the opening of the outer shell.

[0026] Compared with the prior art, the utility model has the following beneficial effects: when assembling the cover plate assembly, top cover and square battery with an explosion-proof valve of the utility model, firstly place the fixing ring of the explosion-proof valve in the hole surrounded by the second step, the bottom surface of the fixing ring abuts against the top surface of the first step, and the side surface of the fixing ring abuts against the side surface of the second step, so as to position the explosion-proof valve, and then weld the fixing ring to the second step, and the top surface of the second step serves as a reserved welding surface, so that the welding operation is convenient and the processing efficiency and welding quality are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0028] Figure 1 A schematic diagram of a partial cross-sectional structure of a square battery provided in a preferred embodiment of the utility model.

[0029] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A.

[0030] Figure 3 Another partial cross-sectional structural schematic diagram of a square battery provided in a preferred embodiment of the utility model.

[0031] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part B.

[0032] in,

[0033] 1. Top cover,

[0034] 11. Cover plate assembly with explosion-proof valve,

[0035] 111, cover plate, 1111, pressure relief hole, 1111a, first step, 1111b, second step, 1111c, third step, 1111d, fourth step,

[0036] 112, explosion-proof valve, 1121, fixed ring,

[0037] 113. Protective film,

[0038] 12, bracket, 121, groove, 1211, exhaust hole,

[0039] 2. Shell.

[0040] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0042] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used for reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0043] The words "first", "second" and the like in the terminology of the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be construed as limiting the order of precedence.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The square battery in the prior art usually includes a top cover and a shell. The top cover includes a cover plate assembly and a bracket. The cover plate assembly includes a cover plate and an explosion-proof valve. The cover plate is provided with a pressure relief hole, and the explosion-proof valve is welded in the pressure relief hole. The structure of the pressure relief hole makes the operation of welding the explosion-proof valve extremely unstable and easily leads to poor welding.

[0046] The following is a preferred embodiment of a cover plate assembly with an explosion-proof valve, a top cover and a square battery provided by the utility model to solve the above technical problems.

[0047] Please refer to Figure 1-Figure 4 The preferred embodiment of the utility model provides a square battery, including a top cover 1 and a shell 2. The top cover 1 is arranged at the opening of the shell 2.

[0048] The top cover 1 includes a cover assembly 11 with an explosion-proof valve and a bracket 12. The cover assembly 11 with an explosion-proof valve includes a cover 111, an explosion-proof valve 112 and a protective sheet 113. The cover 111 is preferably made of aluminum alloy or other hardware materials. The cover 111 is provided with a pressure relief hole 1111, and the side wall of the pressure relief hole 1111 includes a first step 1111a and a second step 1111b arranged in sequence along its axial direction. The first step 1111a and the second step 1111b are both annular, and the aperture of the second step 1111b is larger than the aperture of the first step 1111a. The explosion-proof valve 112 is provided with a fixing ring 1121 along its circumference, and the fixing ring 1121 is arranged in the hole surrounded by the second step 1111b, the bottom surface of the fixing ring 1121 abuts against the top surface of the first step 1111a, and the fixing ring 1121 is welded to the second step 1111b. The protective sheet 113 is preferably made of a plastic material such as PP or PE. The protective sheet 113 covers the pressure relief hole 1111, the second step 1111b is located between the protective sheet 113 and the first step 1111a, and the explosion-proof valve 112 is spaced apart from the protective sheet 113. The bracket 12 is preferably made of a plastic material such as PP or PE. The bracket 12 is connected to the bottom of the cover plate 111, and a groove 121 is provided on the bracket 12. The bracket 12 protrudes downward at the groove 121. The groove 121 is located below the pressure relief hole 1111, and an exhaust hole 1211 is provided at the bottom of the groove 121. The groove 121 can prevent the bracket 12 from touching the explosion-proof valve 112 to prevent damage to the explosion-proof valve 112.

[0049] When assembling the cover plate assembly 11, the top cover 1 and the square battery with an explosion-proof valve of the utility model, the fixing ring 1121 of the explosion-proof valve 112 is first placed in the hole surrounded by the second step 1111b, the bottom surface of the fixing ring 1121 abuts against the top surface of the first step 1111a, and the side surface of the fixing ring 1121 abuts against the side surface of the second step 1111b, so as to position the explosion-proof valve 112, and then the fixing ring 1121 is welded to the second step 1111b, and the top surface of the second step 1111b is used as a reserved welding surface, which makes the welding operation convenient and improves the processing efficiency and welding quality.

[0050] Please refer to Figure 2 , the top surface of the fixing ring 1121 is flush with the top surface of the second step 1111b. This structure makes the welding operation more convenient.

[0051] Please refer to Figure 2 , the width of the top surface of the first step 1111a is 1.5-2.5 times the thickness of the fixing ring 1121. The embodiment shows 2 times. With this structure, the top surface of the first step 1111a can be made wider, so that the fixing ring 1121 can be supported and prevented from sliding into the hole surrounded by the first step 1111a.

[0052] Please refer to Figure 2 and Figure 4 The side wall of the pressure relief hole 1111 also includes an annular third step 1111c and a fourth step 1111d along its axial direction. The third step 1111c is connected to the second step 1111b, and the aperture of the third step 1111c is larger than the aperture of the second step 1111b. The fourth step 1111d is connected to the third step 1111c, and the aperture of the fourth step 1111d is larger than the aperture of the third step 1111c. The protective sheet 113 is arranged on the top surface of the third step 1111c, and the side surface of the protective sheet 113 abuts against the side surface of the fourth step 1111d. With this structure, when installing the protective sheet 113, the protective sheet 113 is placed in the hole surrounded by the fourth step 1111d, the top surface of the third step 1111c limits the bottom surface of the protective sheet 113, and the side surface of the fourth step 1111d limits the side surface of the protective sheet 113, so that the protective sheet 113 can be positioned, making installation convenient.

[0053] Please refer to Figure 2 The top surface of the protective sheet 113 is flush with the top surface of the fourth step 1111d. With this structure, it is easy to identify whether the protective sheet 113 is installed in place, and it can prevent the protective sheet 113 from being scratched by other structures and prevent it from falling off the cover plate 111.

[0054] Please refer to Figure 2 and Figure 4 In the above structure, the height of the third step 1111c is higher than that of the second step 1111b. In this way, the distance between the protection sheet 113 and the explosion-proof valve 112 is larger, thereby preventing the protection sheet 113 from touching the explosion-proof valve 112 and damaging the explosion-proof valve 112.

[0055] Please refer to Figure 2 The protective sheet 113 is made of plastic, and the peripheral bottom surface of the protective sheet 113 is bonded to the top surface of the third step 1111c. With this structure, it is easy to fix the protective sheet 113.

[0056] Please continue to refer to Figure 2 The width of the top surface of the third step 1111c is 4-6 times the thickness of the protective sheet 113. The embodiment shows 5 times. With this structure, the wider top surface of the third step 1111c can make the contact surface between the protective sheet 113 and the top surface of the third step 1111c larger, and the adhesion is more firm.

[0057] The assembly process of the square battery of the preferred embodiment of the utility model is as follows:

[0058] 1. First, place the fixing ring 1121 of the explosion-proof valve 112 in the hole surrounded by the second step 1111b, the bottom surface of the fixing ring 1121 abuts against the top surface of the first step 1111a, and the side surface of the fixing ring 1121 abuts against the side surface of the second step 1111b, so as to position the explosion-proof valve 112, and then weld the fixing ring 1121 to the second step 1111b, and the top surface of the second step 1111b is used as a welding reserved surface to facilitate the welding operation;

[0059] 2. Place the protective sheet 113 into the hole surrounded by the fourth step 1111d. The top surface of the third step 1111c limits the bottom surface of the protective sheet 113, and the side surface of the fourth step 1111d limits the side surface of the protective sheet 113, so that the protective sheet 113 can be positioned, and the peripheral bottom surface of the protective sheet 113 is bonded to the top surface of the third step 1111c.

[0060] 3. Assemble the top cover 1 to the opening of the outer shell 2.

[0061] This completes the assembly process of the square battery of this preferred embodiment.

[0062] When assembling the cover plate assembly, top cover and square battery with explosion-proof valve of the utility model, the fixing ring of the explosion-proof valve is first placed in the hole surrounded by the second step, the bottom surface of the fixing ring abuts against the top surface of the first step, and the side surface of the fixing ring abuts against the side surface of the second step, so as to position the explosion-proof valve, and then the fixing ring is welded to the second step, and the top surface of the second step is used as a welding reserved surface, so that the welding operation is convenient, and the processing efficiency and welding quality are improved.

[0063] To sum up, although the present invention has been disclosed as above in the form of preferred embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the concept of the technical solution of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cover plate assembly with an explosion-proof valve, characterized in that: include: A cover plate, which is provided with a pressure relief hole, wherein the side wall of the pressure relief hole comprises a first step and a second step arranged in sequence along the axial direction thereof, wherein the first step and the second step are both annular, and the aperture of the second step is larger than the aperture of the first step; An explosion-proof valve, wherein a fixing ring is arranged along the circumference of the explosion-proof valve, the fixing ring is arranged in the hole surrounded by the second step, the bottom surface of the fixing ring abuts against the top surface of the first step, and the fixing ring is welded to the second step; and, A protection sheet covers the pressure relief hole, the second step is located between the protection sheet and the first step, and the explosion-proof valve is spaced apart from the protection sheet.

2. The cover plate assembly with explosion-proof valve according to claim 1, characterized in that: The top surface of the fixing ring is flush with the top surface of the second step.

3. The cover plate assembly with explosion-proof valve according to claim 1, characterized in that: The width of the top surface of the first step is 1.5-2.5 times the thickness of the fixing ring.

4. The cover plate assembly with explosion-proof valve according to claim 1, characterized in that: The side wall of the pressure relief hole also includes an annular third step and a fourth step along its axial direction, the third step is connected to the second step, the aperture of the third step is larger than the aperture of the second step, the fourth step is connected to the third step, the aperture of the fourth step is larger than the aperture of the third step, the protective sheet is arranged on the top surface of the third step, and the side surface of the protective sheet is abutted against the side surface of the fourth step.

5. The cover plate assembly with explosion-proof valve according to claim 4, characterized in that: The top surface of the protection sheet is flush with the top surface of the fourth step.

6. The cover plate assembly with explosion-proof valve according to claim 4, characterized in that: The height of the third step is greater than the height of the second step.

7. The cover plate assembly with explosion-proof valve according to claim 4, characterized in that: The protection sheet is made of plastic material, and the peripheral bottom surface of the protection sheet is bonded to the top surface of the third step.

8. The cover plate assembly with explosion-proof valve according to claim 7, characterized in that: The width of the top surface of the third step is 4-6 times the thickness of the protection sheet.

9. A top cover, characterized in that: include: The cover plate assembly with an explosion-proof valve according to any one of claims 1 to 8; as well as, The bracket is connected to the bottom of the cover plate, the bracket is provided with a groove, the bracket is convex downward at the groove, the groove is located below the pressure relief hole, and the bottom of the groove is provided with an exhaust hole.

10. A square battery, characterized in that: include: The top cover according to claim 9; as well as, The outer shell is provided with the top cover at the opening of the outer shell.

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