Cylindrical battery top cover structure with integrated top cover and explosion-proof valve

Abstract

The utility model relates to the technical field and discloses a cylindrical battery top cover structure integrating a top cover and an explosion-proof valve. The cylindrical battery top cover structure comprises a pole, upper plastic, a top cover sheet and lower plastic, the pole, the upper plastic, the top cover plate and the lower plastic are connected in sequence, and the pole penetrates through the upper plastic, the top cover plate and the lower plastic; the top cover sheet is provided with a pressure relief area, the thickness of the pressure relief area is smaller than that of the top cover sheet, the lower plastic cement is provided with a through area, the through area is opposite to the pressure relief area, the pressure relief area is communicated with the internal space of the battery cell, and a sealing ring is arranged between the pole and the top cover sheet. An airtight groove is formed in the surface, attached to the riveting block, of the lower plastic, the airtight groove is communicated with the internal space of the battery cell and the penetrating space of the pole column, the penetrating space of the pole column comprises the space, allowing the pole column to penetrate through, of the lower plastic, and the explosion-proof valve has the advantages that the welding defect of the explosion-proof valve can be avoided, and high-pressure gas can be exhausted in time.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a cylindrical battery top cover structure with an integrated top cover explosion-proof valve. Background Art

[0002] As an emerging energy storage medium, lithium batteries have high energy density, high output power, long charge and discharge life, fast charging, and a wide operating temperature range, making their application widely popular, especially as energy storage units for new energy vehicles, which are closely related to people's lives and have high requirements for their safety.

[0003] When the temperature inside a lithium battery is too high or the pressure is too high, a chemical reaction will occur inside the battery, generating gas, which will cause the pressure inside the battery to continue to increase. This will cause the pressure inside the battery to be too high, thus damaging the battery, and in the worst case, causing the battery to explode. To avoid this from happening, the battery of new energy vehicles is equipped with a "battery explosion-proof valve". When the pressure inside the battery suddenly increases or the temperature rises rapidly, the valve will automatically trigger, pop open, and dissipate the high-pressure gas to the outside. Since the battery explosion-proof valve is set inside the battery container, when the valve pops out, the high-pressure gas can be discharged directly from the battery container, thereby avoiding the explosion of the battery.

[0004] The existing explosion-proof valve is installed on the top cover structure of the battery, and the explosion-proof valve and the top cover are connected by welding. Since the explosion-proof valve is usually thin, it has high requirements on the welding process. It is easy for the battery to leak due to poor welding, which will affect the normal operation of the explosion-proof valve, affect product performance, and pose a safety hazard.

[0005] In summary, there is an urgent need for a cylindrical battery top cover structure that is integrated with a top cover explosion-proof valve and can avoid welding defects of an explosion-proof valve and discharge high-pressure gas in a timely manner. Utility Model Content

[0006] In view of the welding problems of explosion-proof valves in the prior art, a cylindrical battery top cover structure with an integrated top cover explosion-proof valve is proposed, which can avoid the welding defects of the explosion-proof valve and discharge high-pressure gas in time.

[0007] In order to solve the above problems, the technical solution of the utility model is:

[0008] A cylindrical battery top cover structure with an integrated top cover explosion-proof valve comprises a pole, an upper plastic, a top cover sheet and a lower plastic; the pole, the upper plastic, the top cover sheet and the lower plastic are connected in sequence, wherein the pole passes through the upper plastic, the top cover sheet and the lower plastic; a pressure relief zone is provided on the top cover sheet, the thickness of the pressure relief zone is thinner than that of the top cover sheet, the lower plastic is provided with a through zone, the through zone is opposite to the pressure relief zone, and the pressure relief zone is connected to the internal space of the battery cell.

[0009] As a preferred technical solution, a sealing ring is provided between the pole and the top cover sheet.

[0010] As a preferred technical solution, the pressure relief area is a trapezoidal groove on the top cover sheet.

[0011] As a preferred technical solution, the trapezoidal groove is an annular structure with two ends connected or not connected.

[0012] As a preferred technical solution, an upper mounting groove for mounting the upper plastic is provided on the top cover sheet.

[0013] As a preferred technical solution, the upper mounting groove is provided with an anti-twist portion.

[0014] As a preferred technical solution, it also includes a riveting block, which is arranged below the lower plastic.

[0015] As a preferred technical solution, an airtight groove is provided on the surface where the lower plastic and the riveting block are in contact, and the airtight groove is respectively connected to the internal space of the battery cell and the through space of the pole, wherein the through space of the pole includes the space of the lower plastic for the pole to pass through.

[0016] Beneficial effects of the utility model:

[0017] 1. The top cover structure of a cylindrical battery with an integrated top cover explosion-proof valve of the utility model is composed of a pole, an upper plastic, a top cover sheet, and a lower plastic in sequence. The upper plastic and the lower plastic are used to provide insulation. The top cover sheet is fixedly connected to the battery cell shell assembly. A pressure relief zone is provided on the top cover sheet. The thickness of the pressure relief zone is thinner than that of the top cover sheet. When the temperature inside the lithium battery is too high or the pressure is too high, the high-pressure gas breaks through the weak part of the top cover sheet, that is, the pressure is released from the pressure relief zone. The pressure relief zone and the top cover sheet are an integrated structure and are part of the top cover sheet. There is no need to perform welding and fixing, thereby avoiding the occurrence of battery leakage due to poor welding. The pressure relief zone is a trapezoidal groove structure. The trapezoidal groove structure is an annular structure with two ends connected or not connected, which is conducive to pressure relief explosion.

[0018] 2. The cylindrical battery top cover structure with an integrated top cover explosion-proof valve described in the utility model has an upper mounting groove for mounting an upper plastic on its top cover sheet, and the upper mounting groove can provide a limit for the upper plastic. Preferably, an anti-twist portion is provided in the upper mounting groove to increase the friction between the upper plastic, or to provide a clamping limit, thereby increasing the torsion of the upper plastic and preventing the upper plastic from rotating.

[0019] 3. The cylindrical battery top cover structure with an integrated top cover explosion-proof valve of the utility model is also provided with a riveting block, which can provide a riveting position for the pole, wherein the surface where the lower plastic and the riveting block are in contact is provided with an airtight groove, which is respectively connected with the internal space of the battery cell and the through space of the pole, and the airtight groove makes it possible to detect the sealing performance of the sealing ring after the riveting is completed, thereby avoiding the influence of the riveting process on the airtightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model discloses a cylindrical battery top cover structure with an integrated top cover explosion-proof valve. Figure 1 ;

[0021] Figure 2 The utility model discloses a cylindrical battery top cover structure with an integrated top cover explosion-proof valve. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the assembly of a cylindrical battery top cover structure with an integrated top cover explosion-proof valve according to the utility model;

[0023] The reference numerals and components involved in the drawings are as follows:

[0024] 1. Pole 2. Apply plastic 3. Top cover 4. Plastic 5. Sealing ring 6. Riveting block 11. Pole cap 12. Pole tube 21. Pole installation slot 31. Upper mounting slot 32. Pressure relief area 41. Through Area 42. Airtight groove 43. Boss 44. Limiting column 311. Anti-twist part DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] Please see attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Figure 1 The utility model discloses a cylindrical battery top cover structure with an integrated top cover explosion-proof valve. Figure 1 ; Figure 2 The utility model discloses a cylindrical battery top cover structure with an integrated top cover explosion-proof valve. Figure 2 ; Figure 3 This is a schematic diagram of the assembly of a cylindrical battery top cover structure with an integrated top cover explosion-proof valve according to the utility model; Figure 1 With attached Figure 2Explosion diagrams from different perspectives are attached. Figure 3 It is only a schematic diagram to show the assembly position relationship between the various components. A cylindrical battery top cover structure with an integrated top cover explosion-proof valve comprises a pole 1, an upper plastic 2, a top cover sheet 3 and a lower plastic 4; specifically, the pole 1 is a copper-aluminum composite pole, comprising a pole cap 11 and a pole tube 12, the upper plastic 2 is a hollow annular structure, provided with a pole mounting groove 21 for mounting the pole cap 11, and a through hole for the pole tube 12 to pass through is provided at the center of the pole mounting groove 21; the base of the upper plastic 2 is embedded in the upper mounting groove 31 of the top cover sheet 3, the top cover sheet 3 is a circular cover structure, the center of which is provided with a groove for the pole tube 12 to pass through, and at the same time, a stepped structure is provided at its edge for adapting and connecting with the outer shell of the battery cell, an annular pressure relief area 32 is provided on the top cover sheet 3 around its axis, the pressure relief area 32 is integrally formed with the top cover sheet 3, and its wall thickness is thinner than other areas of the top cover sheet 3, and the annular pressure relief area 32 can be removed to form a head and tail The connected inverted trapezoidal grooves can also be inverted trapezoidal grooves that are not connected at the beginning and the end. It should be understood that the thickness is designed according to different explosion-proof requirements; a lower plastic 4 for insulation is provided below the top cover sheet 3, and the lower plastic 4 is a cylindrical groove structure, on which a through area 41 is dug, and the through area 41 is opposite to the pressure relief area 32, and is an annular hole position, and its hole position is arranged along the trajectory of the corresponding pressure relief area 32, and covers most of the pressure relief area 32, and the uncovered part is used to connect the two sides of the through area 41, and the pressure relief area 32 is connected to the internal space of the battery cell through the through area 41; the cylindrical battery top cover structure with an integrated top cover explosion-proof valve also includes a sealing ring 5, which is in contact with the surface of the top cover sheet 3 and is embedded in the through hole of the upper plastic 2, and the center of the sealing ring 5 is for the pole tube 12 to pass through, and a riveting block 6 providing a riveting position for the pole 1 is also provided below the lower plastic 4.

[0028] Preferably, in order to facilitate positioning and achieve stable installation between components, the surface of the pole mounting groove 21 of the upper plastic 2 is provided with a protrusion for anti-slip, which can generate friction with the lower surface of the pole cap 11, and the surface of the upper mounting groove 31 of the top cover sheet 3 is also provided with an anti-twist portion 311, and the anti-twist portion 311 can be a plurality of groove structures, and a protrusion corresponding to the groove can be provided on the lower surface of the upper plastic 2 for mutual clamping, which can prevent twisting and can be used for positioning; similarly, a boss 43 for positioning is provided on the upper surface of the lower plastic 4, and correspondingly, the top cover sheet 3 and the lower plastic A groove is provided on the surface in contact with the upper surface of the plastic 4, which is adapted to the boss 43. Two groups of cylindrical limiting columns 44 are provided below the lower plastic 4. The limiting columns 44 are used to be clamped on both sides of the riveting block 6. A corresponding semi-cylindrical groove concave inward is provided on the edge of the cylindrical flat riveting block 6. A welding slot 61 is reserved under the riveting block 6. After the pole 1 is riveted, its end is located inside the riveting block 6. The welding slot 61 is the slot between the end of the pole 1 and the top surface of the riveting block 6, which ensures that the weld mark when the pole 1 and the riveting block 6 are welded after riveting does not exceed the top surface of the riveting block 6;

[0029] In order to ensure the airtightness of the top cover structure, a sealing ring 5 is provided between the pole 1 and the top cover sheet 3 and the upper plastic 2. When the pressure is too tight during the riveting process, it is impossible to detect the sealing of the sealing ring 5, or it is impossible to judge whether there is a sealing ring 5 inside. Therefore, the surface where the lower plastic 4 and the riveting block 6 are in contact is provided with a plurality of groups of airtight grooves 42. The airtight groove 42 is a long strip groove structure, and its length is longer than the radius of the riveting block 6. That is, when the riveting block 6 is installed, one end of the airtight groove 42 is located outside the edge of the riveting block 6, so that the space where the pole tube 12 is located can be communicated with the outside through the airtight groove 42 after riveting, so that the airtightness of the inside can be detected by bypassing the riveting block 6 through the airtight groove 42, and the airtightness detection means is the existing technology.

[0030] The use of the utility model is as follows: the anti-twist portion 311 on the top cover sheet 3 is matched with the upper plastic 2, the sealing ring 5 is embedded in the top cover sheet 3 and the upper plastic 2, the lower surface of the pole cap 11 is in contact with the sealing ring 5 and the surface of the pole mounting groove 21 of the upper plastic 2, the pole tube 12 passes through the sealing ring 5 and the lower plastic 4 to reach the riveting block 6 and complete the riveting, that is, the cylindrical battery top cover structure with the top cover explosion-proof valve integrated is formed.

[0031] It should be noted that: the cylindrical battery top cover structure with an integrated top cover explosion-proof valve of the utility model is composed of a pole 1, an upper plastic 2, a top cover sheet 3, and a lower plastic 4 in sequence. The upper plastic 2 and the lower plastic 4 are used to provide insulation. The top cover sheet 3 is fixedly connected to the battery cell shell assembly. A pressure relief area 32 is provided on the top cover sheet 3. The thickness of the pressure relief area 32 is thinner than that of the top cover sheet 3. When the temperature inside the lithium battery is too high or the pressure is too high, the high-pressure gas breaks through the weak part of the top cover sheet 3 and releases the pressure from the pressure relief area 32. The pressure relief area 32 is an integrated structure with the top cover sheet 3 and is a part of the top cover sheet 3. It does not need to be welded and fixed, thereby avoiding the occurrence of battery leakage due to poor welding. The pressure relief area 32 is a ladder. The trapezoidal groove structure is an annular structure with two ends connected or not connected, which is conducive to pressure relief explosion; the top cover sheet 3 is provided with an upper mounting groove 31 for mounting the upper plastic 2, and the upper mounting groove 31 can provide a limit for the upper plastic 2. Preferably, an anti-twist portion 311 is provided in the upper mounting groove 31 to increase the friction between the upper plastic 2, or provide a clamping limit, thereby increasing the torque of the upper plastic 2 and preventing the upper plastic 2 from rotating; the surface of the lower plastic 4 that is in contact with the riveting block 6 is provided with an airtight groove 42, which is respectively connected to the internal space of the battery cell and the through space of the pole 1. Through the airtight groove 42, the sealing performance of the sealing ring 5 can still be detected after the riveting is completed, thereby avoiding the influence of the riveting process on the airtightness.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A cylindrical battery top cover structure with an integrated top cover explosion-proof valve, characterized in that: It includes a pole, an upper plastic, a top cover sheet, and a lower plastic; the pole, the upper plastic, the top cover sheet, and the lower plastic are connected in sequence, wherein the pole passes through the upper plastic, the top cover sheet, and the lower plastic; a pressure relief area is provided on the top cover sheet, the thickness of the pressure relief area is thinner than that of the top cover sheet, the lower plastic is provided with a through area, the through area is opposite to the pressure relief area, and the pressure relief area is connected to the internal space of the battery cell.

2. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 1, characterized in that: A sealing ring is provided between the pole and the top cover sheet.

3. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 1, characterized in that: The pressure relief area is a trapezoidal groove on the top cover sheet.

4. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 3, characterized in that: The trapezoidal groove is an annular structure with two ends connected or not connected.

5. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 1, characterized in that: The top cover sheet is provided with an upper mounting groove for mounting the upper plastic.

6. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 5, characterized in that: The upper mounting groove is provided with an anti-twisting portion.

7. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 2, characterized in that: It also includes a riveting block, which is arranged below the lower plastic.

8. The cylindrical battery top cover structure with integrated top cover explosion-proof valve according to claim 7, characterized in that: An airtight groove is provided on the surface where the lower plastic and the riveting block are in contact, and the airtight groove is respectively connected with the inner space of the battery cell and the through space of the pole, wherein the through space of the pole includes the space of the lower plastic for the pole to pass through.

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