Novel battery top cover

Abstract

The utility model provides a novel battery top cover, which relates to the technical field of secondary batteries and comprises a top cover and lower plastic assembled below the top cover, two sides of the top of the top cover are provided with mounting grooves, pole groups are mounted in the mounting grooves, each pole group comprises a sealing ring, a pole column, an aluminum ring and upper plastic, the sealing rings are mounted in the mounting grooves, the pole columns are mounted in the sealing rings, and the aluminum rings are mounted in the aluminum rings. The bottom of the pole penetrates through the sealing ring, the top cover and the lower plastic; a plurality of grooves are formed in the outer edge of the pole, inner blocking pieces are fixed in the grooves, the aluminum ring is arranged on the outer edge of the pole in a sleeving mode, when the sealing ring deforms due to changes of the temperature of the battery, the sealing ring only makes contact with the upper plastic in the gap between the aluminum ring and the pole, the upper plastic at the position can be blocked through the inner blocking pieces, and the deformation condition is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, and more specifically, the utility model relates to a new type of battery top cover. Background Art

[0002] At present, the battery top cover includes a top cover body, a pole column installed on the top cover body, and a lower plastic used to separate the top cover body and the battery cell body, where the lower plastic is installed at the bottom of the top cover body; a through hole is provided on the top cover body, the pole column is installed in the through hole, and the pole column and the top cover body are sealed by a sealing ring to ensure the airtightness of the battery top cover.

[0003] In the prior art, a sealing ring needs to be provided to achieve the seal between the pole column and the top cover body. The installation of the sealing ring needs to consider the cooperation relationship between the sealing ring and the lower plastic, and the cooperation relationship between the lower plastic and the top cover body. The assembly of multiple components is complex, and because the use environment of the battery is special, high temperature will be generated during the charge and discharge process, which will cause the rubber sealing ring to deform due to thermal expansion and contraction. In the traditional structure, the sealing ring contacts the upper plastic (as shown in Figure 8 ), and the thermal expansion and contraction will affect the sealing ring of the upper plastic, directly leading to the risk of seal failure. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that when the sealing ring contacts the upper plastic, the thermal expansion and contraction will affect the sealing ring of the upper plastic, directly leading to the risk of seal failure. In view of the problems existing in the prior art, a new type of battery top cover is provided.

[0005] The purpose and effect of the utility model are achieved by the following specific technical means:

[0006] A new type of battery top cover includes a top cover and a lower plastic assembled below the top cover;

[0007] Installation grooves are provided on both sides of the top of the top cover, and a pole group is installed in the installation grooves. The pole group includes a sealing ring, a pole column, an aluminum ring and an upper plastic. The sealing ring is installed in the installation groove, and the pole column is installed in the sealing ring. The bottom of the pole column passes through the sealing ring, the top cover and the lower plastic;

[0008] A plurality of grooves are provided on the outer edge of the pole column, and inner stoppers are fixed in the grooves. The aluminum ring is sleeved on the outer edge of the pole column, and the inner wall of the aluminum ring abuts against the inner stoppers. The upper plastic is assembled outside the aluminum ring and in the gap between the aluminum ring and the pole column by hot melt molding;

[0009] With this design, by blocking the rebound of the sealing ring with the inner stopper, the deformation of the sealing ring caused by temperature can be prevented.

[0010] Further preferred solution: A limiting groove in the shape of a through hole is provided at the top of the top cover and outside the installation groove, and a plug-in portion is provided at the bottom of the aluminum ring, and the plug-in portion is inserted into the limiting groove;

[0011] With this design, the connection between the aluminum ring and the installation groove for fastening the pole group is avoided from loosening.

[0012] Further preferred solution: An explosion-proof port is provided on the top surface of the top cover, and an explosion-proof structure is installed in the explosion-proof port;

[0013] Further preferred solution: A plurality of diversion ports are provided at the position of the lower plastic corresponding to the explosion-proof port.

[0014] Further preferred solution: The bottom end of the plug-in portion is welded to the inner wall of the slot, and the top end of the aluminum ring is chamfered inward to form a bent shape;

[0015] With this design, the top of the aluminum ring can hold the inner retaining member and the sealing ring.

[0016] Further preferred solution: Both the installation groove and the pole group are two, and the pole columns in the two groups of pole groups are the positive pole column and the negative pole column respectively.

[0017] Further preferred solution: The pole group is square or circular.

[0018] Advantages of the present utility model:

[0019] After the aluminum ring is assembled, the upper plastic is formed by hot melting. The upper plastic will seep into the gap between the aluminum ring and the pole column from the spaces on both sides of the inner retaining member. After the upper plastic cools and forms, the assembly work is completed. When the sealing ring deforms due to the change of the battery temperature, the sealing ring only contacts the upper plastic in the gap between the aluminum ring and the pole column, and the inner retaining member can block the upper plastic at this position to avoid deformation. The inner retaining members on the four sides can ensure the strength of the overall structure of the pole group;

[0020] The top end of the aluminum ring is chamfered inward to form a bent shape. With such a design, the bent portion of the aluminum ring can further prevent the inner retaining member and the upper plastic in the gap between the aluminum ring and the pole column from being displaced upward under the influence of the sealing ring, further strengthening on the basis of the inner retaining member. Description of the drawings

[0021] The following further describes the present utility model with reference to the drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0023] Figure 2 It is a schematic diagram of the disassembly of the overall structure of the present utility model;

[0024] Figure 3 For the present utility modelFigure 2 Schematic diagram of enlarged partial structure at position A in

[0025] Figure 4 Top view of the overall structure of the present utility model;

[0026] Figure 5 Front view of the overall structure of the present utility model;

[0027] Figure 6 For the present utility model Figure 5 Schematic diagram of enlarged partial structure at position B in

[0028] Figure 7 Assembly schematic diagram of the pole column, aluminum ring and upper plastic of the present utility model;

[0029] Figure 8 Schematic diagram of the existing pole column assembly structure.

[0030] Figures 1-7 In it: top cover 1, lower plastic 2, explosion-proof structure 3, installation groove 4, limit groove 401, slot 402, sealing ring 5, pole column 6, groove 601, aluminum ring 7, insertion part 701, upper plastic 8, inner retaining part 9. Detailed implementation manners

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners. The following embodiments are only examples for implementing the present utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the present utility model. On the contrary, modifications and refinements made without departing from the scope of the present utility model fall within the scope of patent protection of the present utility model.

[0032] Please refer to Figures 1-7 , a new type of battery top cover 1, including a top cover 1 and a lower plastic 2 assembled below the top cover 1. The lower plastic 2 is snap-fitted to the bottom surface of the top cover 1, and the snap-fitting parts are at least at four corners;

[0033] On both sides of the top of the top cover 1, there are installation grooves 4, and a pole group is installed in the installation grooves 4. The pole group includes a sealing ring 5, a pole column 6, an aluminum ring 7 and an upper plastic 8. The sealing ring 5 is installed in the installation groove 4, and the pole column 6 is installed in the sealing ring 5. The bottom of the pole column 6 passes through the sealing ring 5, the top cover 1 and the lower plastic 2. First, place the top cover 1 horizontally, and then sequentially place the sealing ring 5, the pole column 6 and the aluminum ring 7 into the installation groove 4 from bottom to top. The bottom of the pole column 6 will pass through the center of the sealing ring 5;

[0034] Furthermore, on the top of the top cover 1 and outside the installation groove 4, there is a through-hole-shaped limit groove 401 (such as Figure 3As shown in the figure, the bottom of the aluminum ring 7 is provided with a plug-in portion 701. After the aluminum ring 7 is assembled with the top cover 1, the plug-in portion 701 is inserted into the limit groove 401 (as Figure 5 shown). Then, welding methods such as friction welding are used to weld the plug-in portion 701 to the inner wall of the slot 402;

[0035] Preferably, there are preferably four limit grooves 401 and plug-in portions 701, which are distributed in a rectangular shape on four sides. In this way, it can play a stabilizing role on the four sides of the pole column 6, especially suitable for the structure of the square pole column 6, effectively improving the structural strength;

[0036] Furthermore, a plurality of grooves 601 are provided on the outer edge of the pole column 6, and inner retaining members 9 are fixed in the grooves 601. The aluminum ring 7 is sleeved on the outer edge of the pole column 6. When the aluminum ring 7 is assembled on the outside of the pole column 6, the inner side will abut against the inner retaining member 9 (as Figure 6 shown). When the pole column 6 is a square pole column 6, the inner retaining members 9 are preferably four and are respectively distributed on the four sides of the pole column 6 (as Figure 7 shown). After the aluminum ring 7 is assembled, the upper plastic 8 is formed by hot melting. The upper plastic 8 will penetrate into the gap between the aluminum ring 7 and the pole column 6 from the space on both sides of the inner retaining member 9 (as Figure 6 shown). After the upper plastic 8 cools and forms, the assembly work is completed. When using the battery later, when the sealing ring 5 deforms due to the change of the battery temperature, the sealing ring 5 only contacts the upper plastic 8 in the gap between the aluminum ring 7 and the pole column 6, and the inner retaining member 9 can block the upper plastic 8 at this position to avoid deformation. The inner retaining members 9 on the four sides can ensure the strength of the overall structure of the electrode group;

[0037] Even further, as Figure 6 shown, the top end of the aluminum ring 7 is chamfered inward to form a bent shape. Through such a design, the bent portion of the aluminum ring 7 can further prevent the inner retaining member 9 and the upper plastic 8 in the gap between the aluminum ring 7 and the pole column 6 from being displaced upward under the influence of the sealing ring 5, further strengthening on the basis of the inner retaining member 9.

[0038] Please refer to Figures 1-2 , an explosion-proof port is provided on the top surface of the top cover 1, and an explosion-proof structure 3 is installed in the explosion-proof port. The explosion-proof structure 3 is preferably an aluminum-plastic film or aluminum sheet structure with notches, which can explode and relieve pressure when the battery bulges, preventing the entire battery cell from bursting and generating great destructive force;

[0039] Furthermore, a plurality of diversion ports are provided at the position of the lower plastic 2 corresponding to the explosion-proof port. Through such a design, the pressure can be further diverted to reduce the impact force during pressure relief.

[0040] There are two installation grooves 4 and two electrode groups. The pole columns 6 in the two electrode groups are the positive pole column 6 and the negative pole column 6 respectively. When installing the battery pack later, the positive pole column 6 and the negative pole column 6 are respectively connected to the busbar structure for electrical connection for charging and discharging.

Claims

1. A new type of battery top cover, comprising a top cover and a lower plastic assembled under the top cover, characterized in that: Mounting grooves are provided on both sides of the top cover, and pole groups are installed in the mounting grooves. The pole groups include sealing rings, poles, aluminum rings and upper plastics. The sealing rings are installed in the mounting grooves, and the poles are installed in the sealing rings. The bottom of the poles passes through the sealing rings, the top cover and the lower plastics. The outer edge of the pole is provided with a plurality of grooves, and inner stoppers are fixed in the grooves. The aluminum ring is sleeved on the outer edge of the pole, and the inner wall of the aluminum ring abuts against the inner stoppers. The upper plastic is formed by hot melt and assembled outside the aluminum ring and in the gap between the aluminum ring and the pole.

2. A novel battery top cover according to claim 1, characterized in that: A through-hole-shaped limiting groove is provided at the top of the top cover and outside the installation groove, and a plug-in portion is provided at the bottom of the aluminum ring, and the plug-in portion is inserted into the limiting groove.

3. A novel battery top cover according to claim 1, characterized in that: An explosion-proof opening is provided on the top surface of the top cover, and an explosion-proof structure is installed in the explosion-proof opening.

4. A novel battery top cover according to claim 1, characterized in that: The lower plastic is provided with a plurality of diversion openings at positions corresponding to the explosion-proof openings.

5. A novel battery top cover according to claim 2, characterized in that: The bottom end of the plug-in portion is welded to the inner wall of the slot, and the top end of the aluminum ring is chamfered inwardly to form a bent shape.

6. A novel battery top cover according to claim 1, characterized in that: There are two mounting slots and two pole groups, and the poles in the two pole groups are respectively a positive pole and a negative pole.

7. A novel battery top cover according to claim 1, characterized in that: The pole group is square or circular.

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