Cylindrical battery upper cover assembly

Abstract

The utility model relates to the technical field of battery packaging, and discloses an upper cover assembly of a cylindrical battery. The upper cover assembly comprises a pole, a top cover and a reinforcing piece, wherein the pole comprises a top plate and a circular boss integrally formed at the bottom of the top plate; a first through hole is formed in the center of the top cover; the circular boss penetrates through the first through hole and extends below the top cover; a second through hole is formed in the center of the reinforcing piece, and the end of the circular boss is fixedly connected to the second through hole. An upper insulating rubber ring is arranged between the top plate and the top cover, a lower insulating rubber ring is arranged between the top cover and the reinforcing piece, and the top plate, the top cover and the reinforcing piece are in hot melting sealing connection through the upper insulating rubber ring and the lower insulating rubber ring. According to the upper cover assembly, the contact surfaces among the pole, the top cover and the reinforcer can be comprehensively and tightly fixed and sealed, the overall sealing performance, isolation performance and stability of the upper cover assembly are improved, and leakage of electrolyte is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packaging, in particular to a cylindrical battery upper cover assembly. Background Art

[0002] Cylindrical batteries offer high capacity, long cycle life, and a wide operating temperature range. With the development of the new energy industry, higher requirements are being placed on battery energy density, cycle life, safety, and reliability. Existing technologies typically use laser welding or riveting to seal and secure the connection between the terminal and cover assembly of cylindrical batteries. However, this welding process carries a certain probability of cold welds, weld perforations, and nickel plating loss, leading to the risk of electrolyte leakage.

[0003] However, although the riveting method can solve some of the problems in the traditional welding process that lead to insufficient sealing and isolation, the riveting force applied to the insulating parts in the riveted structure is limited to the circumferential position of the pole, that is, the insulating parts cannot be compressed and sealed as a whole, resulting in poor sealing and isolation of the battery cover.

[0004] Therefore, there is an urgent need for a cylindrical battery cover assembly to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of the present invention is to provide a cylindrical battery cover assembly for optimizing the connection structure between the pole, the cover plate and the insulating gasket, and further improving the sealing and isolation performance of the cylindrical battery.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The utility model provides a cylindrical battery cover assembly, comprising:

[0008] A pole, comprising a top plate and a circular boss integrally formed at the bottom of the top plate;

[0009] A top cover, wherein a first through hole is provided in the center of the top cover; the circular boss passes through the first through hole and extends to the bottom of the top cover;

[0010] A reinforcement member, wherein a second through hole is provided at the center of the reinforcement member, and an end portion of the circular boss is fixedly connected to the second through hole;

[0011] An upper insulating rubber ring is provided between the top plate and the top cover, and a lower insulating rubber ring is provided between the top cover and the reinforcement. The top plate, the top cover and the reinforcement are hot-melt sealed by the upper insulating rubber ring and the lower insulating rubber ring.

[0012] As an optional technical solution for a cylindrical battery cover assembly, the first through hole is provided with an insulating ring, the outer diameter of the insulating ring abuts against the inner wall of the first through hole, and the inner diameter thereof abuts against the outer diameter of the circular boss.

[0013] As an optional technical solution for a cylindrical battery top cover assembly, an insulating base is provided under the top cover, a third through hole is opened in the center of the insulating base, and the reinforcement is sleeved on the third through hole; a fourth through hole is provided in the center of the pole, and the fourth through hole is coaxial with the circular boss.

[0014] As an optional technical solution for a cylindrical battery cover assembly, the top plate is provided with a first sunken platform and a second sunken platform around the fourth through hole, and the diameter of the first sunken platform is greater than the diameter of the second sunken platform.

[0015] As an optional technical solution for a cylindrical battery cover assembly, a peep window is installed on the first sunken platform, and an exhaust hole is provided on the peep window; an explosion-proof valve is installed on the second sunken platform.

[0016] As an optional technical solution for a cylindrical battery cover assembly, a fixing ring is installed on the first sinking platform, and a plunger is embedded in the end of the fourth through hole close to the second sinking platform.

[0017] As an optional technical solution for a cylindrical battery cover assembly, the top plate is provided with a third sunken platform surrounding the fourth through hole, and a sealing nail is welded on the third sunken platform.

[0018] As an optional technical solution for a cylindrical battery top cover assembly, the outer diameter of the end of the circular boss is chamfered, and the inner diameter of the second through hole near the bottom of the reinforcement is chamfered; an annular "V" groove is formed between the end of the circular boss and the inner diameter of the second through hole.

[0019] As an optional technical solution for a cylindrical battery cover assembly, the pole and the reinforcement are fixedly connected by welding and sealing in the annular "V" groove.

[0020] As an optional technical solution for a cylindrical battery top cover assembly, a positioning step is provided on the outer diameter of the top cover.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides a cylindrical battery cover assembly, which includes a pole, a top cover and a reinforcement. The pole includes a top plate and a circular boss integrally provided at the bottom of the top plate; a first through hole is provided at the center of the top cover; the circular boss passes through the first through hole and extends to the bottom of the top cover; a second through hole is provided at the center of the reinforcement, and the end of the circular boss is fixed to the second through hole; an upper insulating rubber ring is provided between the top plate and the top cover, and a lower insulating rubber ring is provided between the top cover and the reinforcement. The top plate, the top cover and the reinforcement are connected by hot-melt sealing via the upper insulating rubber ring and the lower insulating rubber ring. The top cover assembly is provided with the upper insulating rubber ring and the lower insulating rubber ring, and after hot-melt bonding the upper insulating rubber ring and the lower insulating rubber ring, the contact surfaces between the pole, the top cover and the reinforcement can be fully and tightly fixed and sealed, thereby improving the overall sealing, isolation and stability of the top cover assembly, effectively preventing leakage of electrolyte, and solving the problem of insufficient sealing caused by traditional welding sealing or riveting sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded schematic diagram of the cylindrical battery cover assembly in Example 1 of the present utility model;

[0024] Figure 2 This is a cross-sectional schematic diagram of the cylindrical battery cover assembly in Example 1 of the present utility model;

[0025] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0026] Figure 4 This is an exploded schematic diagram of the cylindrical battery cover assembly in the second embodiment of the present utility model;

[0027] Figure 5 This is an exploded schematic diagram of the cylindrical battery cover assembly in the third embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the exploded view of the cylindrical battery cover assembly in the fourth embodiment of the present utility model.

[0029] In the figure: 1. Pole; 11. Top plate; 12. Circular boss; 13. First sunken platform; 14. Second sunken platform; 15. Fourth through hole; 16. Peep window; 17. Explosion-proof valve; 18. Fixing ring; 19. Plunger; 112. Third sunken platform; 113. Sealing pin; 2. Upper insulating rubber ring; 3. Top cover; 31. First through hole; 32. Insulating ring; 33. Positioning step; 4. Lower insulating rubber ring; 5. Reinforcement member; 51. Second through hole; 52. Annular "V" groove; 6. Insulating base; 61. Third through hole. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "up", "down", "left", "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Example 1

[0036] like Figure 1-3As shown, the utility model provides a cylindrical battery cover assembly, which includes: a pole 1, the pole 1 includes a top plate 11 and a circular boss 12 integrally formed at the bottom of the top plate 11; a top cover 3, a first through hole 31 is provided in the center of the top cover 3; the circular boss 12 passes through the first through hole 31 and extends to the bottom of the top cover 3; a reinforcement 5, a second through hole 51 is provided in the center of the reinforcement 5, and the end of the circular boss 12 is fixed to the second through hole 51; wherein, an upper insulating rubber ring 2 is provided between the top plate 11 and the top cover 3, and a lower insulating rubber ring 4 is provided between the top cover 3 and the reinforcement 5, and the top plate 11, the top cover 3 and the reinforcement 5 are hot-melt sealed by the upper insulating rubber ring 2 and the lower insulating rubber ring 4.

[0037] The utility model provides a cylindrical battery upper cover assembly by arranging an upper insulating rubber ring 2 and a lower insulating rubber ring 4, and hot-melting and compounding the upper insulating rubber ring 2 and the lower insulating rubber ring 4 so that the contact surfaces between the pole 1, the top cover 3 and the reinforcement 5 can be fully and tightly fixed and sealed, thereby improving the overall sealing, isolation and stability of the upper cover assembly, effectively preventing leakage of the electrolyte, and solving the problem of insufficient sealing caused by traditional welding sealing or riveting sealing.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, the upper insulating rubber ring 2 and the lower insulating rubber ring 4 are both sleeved on the circular boss 12, and the diameter of the upper insulating rubber ring 2 is greater than or equal to the diameter of the top plate 11, and the diameter of the lower insulating rubber ring 4 is greater than or equal to the diameter of the reinforcement 5. Therefore, after the upper insulating rubber ring 2 and the lower insulating rubber ring 4 are hot-melt composited, the contact surfaces between the top plate 11 and the top cover 3 and the reinforcement 5 and the top cover 3 can be fully covered and sealed, so that the sealing isolation and stability of the entire upper cover assembly are stronger.

[0039] Further, such as Figure 2 and Figure 3As shown, in order to ensure the insulation and sealing between the circular boss 12 and the top cover 3, an insulating ring 32 is provided in the first through hole 31, and the outer diameter of the insulating ring 32 abuts against the inner wall of the first through hole 31, and its inner diameter abuts against the outer diameter of the circular boss 12. Under this structure, the insulation and sealing between the circular boss 12 and the top cover 3 are further improved; and the outer diameter of the end of the circular boss 12 is chamfered, and the inner diameter of the second through hole 51 near the bottom of the reinforcement 5 is chamfered; that is, a ring "V" is formed between the end of the circular boss 12 and the inner diameter of the second through hole 51. " groove 52, when the circular boss 12 is sleeved in the second through hole 51, the bottom end of the circular boss 12 and the bottom surface of the reinforcement 5 are in the same plane; by welding the end of the circular boss 12 and the reinforcement 5 in the annular "V" groove 52, on the one hand, the sealing and stability between the circular boss 12 and the reinforcement 5 can be improved, so that the sealing isolation and strength of the entire upper cover assembly are further improved; on the other hand, the provision of the annular "V" groove 52 avoids the formation of protruding weld marks when welding between the circular boss 12 and the reinforcement 5, which affects the physical damage of the upper cover assembly to the battery cell.

[0040] In this embodiment, an insulating base 6 is further provided below the top cover 3. A third through hole 61 is provided at the center of the insulating base 6. A sunken platform is provided around the third through hole 61 for the lower insulating rubber ring 4 to avoid air, and the height of the sunken platform is less than the thickness of the lower insulating rubber ring 4. After the lower insulating rubber ring 4 is hot-melted, the insulating base 6 can be tightly abutted against the top cover 3, making the integrity of the upper cover assembly more stable. The provision of the insulating base 6 can insulate and isolate the battery cell from the upper cover assembly, ensuring the safety and stability of the battery. A reinforcement 5 is sleeved in the third through hole 61. The provision of the reinforcement 5 can, on the one hand, strengthen the strength of the cover assembly, and on the other hand, make the ductility of the pole 1 better, that is, the connecting piece of the battery cell can be welded to the reinforcement 5. In addition, a positioning step 33 is provided on the outer diameter of the top cover 3. When the cover assembly and the battery are assembled, the positioning step 33 can improve the assembly efficiency between the cover assembly and the battery shell.

[0041] Example 2

[0042] like Figure 4As shown, the difference between this embodiment and the first embodiment is that a fourth through hole 15 is provided at the center of the pole 1, and the fourth through hole 15 and the circular boss 12 are coaxial, and the fourth through hole 15 is used for injecting the electrolyte; the top plate 11 is respectively provided with a first sinking platform 13 and a second sinking platform 14 around the fourth through hole 15, the diameter of the first sinking platform 13 is greater than the diameter of the second sinking platform 14, and the first sinking platform 13 is higher than the position of the second sinking platform 14; a peek window 16 is installed on the first sinking platform 13, and an exhaust hole is provided on the peek window 16, so that the peek window 16 can be opened. The window 16 and the first sink 13 are connected by gluing; an explosion-proof valve 17 is installed on the second sink 14. The explosion-proof valve 17 is set in a slightly convex shape. The explosion-proof valve 17 can be made of aluminum or aluminum alloy, but is not limited to these two materials. When the internal pressure of the battery increases and exceeds the pressure limited by the explosion-proof valve 17, the explosion-proof rupture is used to release the pressure, thereby playing an explosion-proof role. The exhaust hole set on the peep window 16 can effectively and quickly discharge the airflow inside the battery, and the status of the explosion-proof plate can be observed at any time through the peep window 16.

[0043] Example 3

[0044] like Figure 5 As shown, the difference between this embodiment and the above embodiment is that a fixing ring 18 is installed on the first sink 13, and a plunger 19 is embedded in the end of the fourth through hole 15 close to the second sink 14. The plunger 19 is made of a material with good elasticity, such as rubber; and the plunger 19 is in the shape of a large and small cylindrical head. When the electrolyte is injected from the fourth through hole 15, the smaller end of the plunger 19 is inserted into the fourth through hole 15, and the larger end of the plunger 19 is abutted against the second sink 14 to achieve an interference fit connection. The fixing ring 18 and the top plate 11 of the pole 1 are fixed by spot welding, and a certain pressure is applied to the plunger 19. When the pressure inside the battery reaches the limit, the spot welding point is reopened, thereby playing an explosion-proof role; in addition, the stress generated by the fixing ring 18 after welding can be eliminated through spot welding to affect the sealing of the plunger 19, so that the sealing between the plunger 19 and the pole 1 is better.

[0045] Example 4

[0046] like Figure 6 As shown, the difference between this embodiment and the above embodiment is that a third sink 112 is opened at the top plate 11 around the fourth through hole 15, and a sealing nail 113 is welded on the third sink 112. The sealing nail 113 is a three-layer structure with upper and lower metal surfaces and a low-temperature PP hot melt adhesive in the middle. The welding seal between the sealing nail 113 and the pole 1 makes the sealing of the upper cover assembly more stable. When the temperature inside the battery reaches a certain limit, the low-temperature PP hot melt adhesive layer in the middle of the sealing nail 113 is softened, and the upper and lower metal layers bulge upward, deform or rupture, thereby playing an explosion-proof role. The setting of the sealing nail 113 makes the safety of the finished battery in the later use more stable.

[0047] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. A cylindrical battery cover assembly, characterized in that: include: A pole, comprising a top plate and a circular boss integrally formed at the bottom of the top plate; A top cover, wherein a first through hole is provided in the center of the top cover; the circular boss passes through the first through hole and extends to the bottom of the top cover; A reinforcement member, wherein a second through hole is provided at the center of the reinforcement member, and an end portion of the circular boss is fixedly connected to the second through hole; An upper insulating rubber ring is provided between the top plate and the top cover, and a lower insulating rubber ring is provided between the top cover and the reinforcement. The top plate, the top cover and the reinforcement are hot-melt sealed by the upper insulating rubber ring and the lower insulating rubber ring.

2. A cylindrical battery cover assembly according to claim 1, characterized in that: The first through hole is provided with an insulating ring, the outer diameter of the insulating ring abuts against the inner wall of the first through hole, and the inner diameter of the insulating ring abuts against the outer diameter of the circular boss.

3. The cylindrical battery cover assembly according to claim 1, characterized in that: An insulating base is provided below the top cover, a third through hole is provided at the center of the insulating base, and the reinforcement is sleeved in the third through hole; a fourth through hole is provided at the center of the pole, and the fourth through hole is coaxial with the circular boss.

4. The cylindrical battery cover assembly according to claim 1, characterized in that: The top plate is respectively provided with a first sunken platform and a second sunken platform around the fourth through hole, wherein the diameter of the first sunken platform is greater than the diameter of the second sunken platform.

5. A cylindrical battery cover assembly according to claim 4, characterized in that: A peep window is installed on the first sunken platform, and an exhaust hole is provided on the peep window; an explosion-proof valve is installed on the second sunken platform.

6. A cylindrical battery cover assembly according to claim 4, characterized in that: A fixing ring is installed on the first sinking platform, and a plunger is embedded in the end of the fourth through hole close to the second sinking platform.

7. The cylindrical battery cover assembly according to claim 3, characterized in that: The top plate is provided with a third sunken platform surrounding the fourth through hole, and a sealing nail is welded on the third sunken platform.

8. The cylindrical battery cover assembly according to claim 1, characterized in that: The outer diameter of the end of the circular boss is chamfered, and the inner diameter of the second through hole near the bottom of the reinforcement is chamfered; an annular "V" groove is formed between the end of the circular boss and the inner diameter of the second through hole.

9. The cylindrical battery cover assembly according to claim 8, characterized in that: The pole and the reinforcement are fixedly connected by welding and sealing in the annular "V" groove.

10. A cylindrical battery cover assembly according to any one of claims 1 to 9, characterized in that: A positioning step is provided on the outer diameter of the top cover.

Images