Heat dissipation top cover structure

Abstract

The heat dissipation top cover structure comprises a top cover plate, the two ends of the top cover plate are provided with a positive pole and a negative pole, the bottom end of the top cover plate is provided with lower plastic, and the heat dissipation top cover structure is characterized in that connecting pieces are arranged between the positive pole and the lower plastic and between the negative pole and the lower plastic, and the positive pole and the negative pole are connected with the connecting pieces. Heat conduction ceramic is arranged between the top cover plate and the lower plastic and located on the inner side of the connecting piece, one end of the heat conduction ceramic is connected with the connecting piece, and the top end of the heat conduction ceramic is connected with the top cover plate. The heat-conducting ceramic is arranged between the top cover sheet and the lower plastic, so that the heat-conducting ceramic is in contact with the connecting sheet and the top cover plate, heat on the connecting sheet is conveniently transferred to the top cover sheet through the heat-conducting ceramic, the problem that heat in the battery cell is isolated and cannot be released is solved, the safety of the battery cell is improved, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium-ion batteries, in particular to a heat dissipation top cover structure. Background Technique

[0002] With the rapid development of new energy vehicles, lithium batteries, as the core components of new energy vehicles, their safety and performance have attracted much attention. A large amount of heat is generated during the operation of lithium batteries. If heat dissipation is not carried out in time, it will cause the battery temperature to be too high, affecting the service life and safety of the battery. Therefore, improving the heat dissipation performance of lithium batteries is an important research direction in the current lithium battery technology field.

[0003] During the charging and discharging process of existing lithium batteries, the temperature at the connection of the internal tabs of the lithium battery rises relatively fast, and the existing top cover has poor thermal conductivity, resulting in serious local heating of the lithium battery, increasing the risk of thermal runaway of the battery core and easily causing potential safety hazards.

[0004] Therefore, we propose a heat dissipation top cover structure to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to propose a heat dissipation top cover structure to solve the deficiencies existing in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A heat dissipation top cover structure includes a top cover plate. Positive and negative posts are provided at both ends of the top cover plate. A lower plastic is provided at the bottom end of the top cover plate. Connection pieces are provided between the positive and negative posts and the lower plastic. The positive and negative posts are connected to the connection pieces. A heat-conducting ceramic is provided between the top cover plate and the lower plastic, and the heat-conducting ceramic is located inside the connection piece. One end of the heat-conducting ceramic is connected to the connection piece, and the top end of the heat-conducting ceramic is connected to the top cover plate.

[0008] Further preferably, riveting blocks are provided around the outside of both the positive and negative posts, and the positive and negative posts penetrate through the riveting blocks.

[0009] Further preferably, sealing rings are provided around the outside of both the positive and negative posts, the positive and negative posts penetrate through the sealing rings of the riveting blocks, and the sealing rings are all located above the riveting blocks.

[0010] Further preferably, a negative upper plastic is provided at the top end of the negative post, a positive upper plastic is provided at the top end of the positive post, and both the negative upper plastic and the positive upper plastic are formed by injection molding.

[0011] Further preferably, an explosion-proof sheet is provided in the middle of the top cover plate, a pressure relief hole penetrating the top cover plate is provided at the bottom end of the top cover plate, and the explosion-proof sheet is located in the pressure relief hole.

[0012] Further preferably, an explosion-proof valve sticker is provided at the top end of the explosion-proof sheet. The explosion-proof valve sticker is located in the pressure relief hole. After the explosion-proof sheet and the explosion-proof valve sticker are combined, they do not exceed the end face of the top cover plate.

[0013] Further preferably, round holes are provided at the two ends of the top cover plate corresponding to the positive electrode post and the negative electrode post. Both the positive electrode post and the negative electrode post penetrate through the top cover plate through the round holes and are connected to the connecting piece.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] By placing a heat-conducting ceramic between the top cover sheet and the lower plastic, making it contact with the connecting piece and the top cover plate, it is convenient to transfer the heat on the connecting piece to the top cover sheet through the heat-conducting ceramic, solving the problem that the heat inside the battery cell is isolated and cannot be released, thereby improving the safety of the battery cell and reducing potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is an exploded view of a heat dissipation top cover structure proposed by the present utility model;

[0017] Figure 2 FIG. is a sectional view of a heat dissipation top cover structure proposed by the present utility model;

[0018] Figure 3 is Figure 2 an enlarged schematic view of the structure at A in FIG.

[0019] In the figure: 1, top cover plate; 2, lower plastic; 3, negative electrode post; 4, positive electrode post; 5, riveting block; 6, sealing ring; 7, negative upper plastic; 8, positive upper plastic; 9, explosion-proof sheet; 10, explosion-proof valve sticker; 11, heat-conducting ceramic; 12, connecting piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0021] Referring to Figures 1-3 , a heat dissipation top cover structure includes a top cover plate 1. Positive electrode post 4 and negative electrode post 3 are provided at both ends of the top cover plate 1. There are a total of two connecting pieces 12 between the positive electrode post 4 and the negative electrode post 3 and the lower plastic 2. The positive electrode post 4 and the negative electrode post 3 are respectively connected to the connecting piece 12. The connecting piece 12 is connected to the positive electrode tab and the negative electrode tab of the battery cell to achieve electrical connection;

[0022] The bottom end of the top cover plate 1 is provided with a lower plastic 2. The cross-sectional area of the lower plastic 2 is the same as that of the top cover plate 1, so that the installation and positioning can be more convenient. The lower plastic 2 will not protrude and is not easily damaged. There are a total of two heat-conducting ceramics 11 between the top cover plate 1 and the lower plastic 2, and the two heat-conducting ceramics 11 are located inside the two connecting pieces 12. One end of each of the two heat-conducting ceramics 11 is connected to one of the two connecting pieces 12, and the top ends of the two heat-conducting ceramics 11 are connected to the top cover plate 1;

[0023] By placing a heat-conducting ceramic 11 between the top cover sheet and the lower plastic 2 so that it contacts the connecting piece 12 and the top cover plate 1, it is convenient to transfer the heat on the connecting piece 12 to the top cover sheet through the heat-conducting ceramic 11, solving the problem that the heat inside the battery cell is isolated and cannot be released, thereby improving the safety of the battery cell and reducing potential safety hazards.

[0024] Riveting blocks 5 are provided around the outside of both the positive electrode post 4 and the negative electrode post 3. The positive electrode post 4 and the negative electrode post 3 both penetrate through the riveting blocks 5. For the negative electrode post 3 and the positive electrode post 4, first assemble the sealing ring 6 and then pass through the top cover plate 1 and the upper plastic, and finally assemble the riveting blocks 5 to rivet the top cover through the riveting process.

[0025] Sealing rings 6 are provided around the outside of both the positive electrode post 4 and the negative electrode post 3. The positive electrode post 4 and the negative electrode post 3 both penetrate through the sealing rings 6 of the riveting blocks 5. The sealing rings 6 are all located above the riveting blocks 5. The sealing rings 6 can seal the pole post, prevent the electrode liquid inside the battery from leaking from the pole post, and reduce the risk of electric leakage.

[0026] A negative upper plastic 7 is provided at the top end of the negative electrode post 3, and a positive upper plastic 8 is provided at the top end of the positive electrode post 4. Both the negative upper plastic 7 and the positive upper plastic 8 are formed by injection molding. The injection-molded upper plastic can perfectly fit the positive electrode post 4 and the negative electrode post 3, and can insulate and seal the positive electrode post 4 and the negative electrode post 3 to prevent electric leakage and liquid leakage.

[0027] An explosion-proof sheet 9 is provided in the middle of the top cover plate 1. A pressure relief hole penetrating through the top cover plate 1 is provided at the bottom end of the explosion-proof sheet 9. The explosion-proof sheet 9 is located inside the pressure relief hole. When the internal pressure of the battery cell is too high, the pressure accumulated inside the battery cell will break open the explosion-proof sheet 9, which can effectively prevent the battery cell from exploding.

[0028] An explosion-proof valve sticker 10 is provided at the top end of the explosion-proof sheet 9. The explosion-proof valve sticker 10 is located inside the pressure relief hole. After the explosion-proof sheet 9 and the explosion-proof valve sticker 10 are combined, they do not exceed the end face of the top cover plate 1. Not exceeding the end face of the top cover plate 1 can effectively protect the explosion-proof sheet 9 and the explosion-proof valve sticker 10 from being scratched or damaged by other external objects;

[0029] The protective film is located above the explosion-proof sheet 9. The explosion-proof sheet 9 can break when the internal pressure of the battery cell reaches the critical point, which can effectively prevent the battery cell from exploding due to excessive internal pressure. At the same time, the protective film can protect the explosion-proof sheet 9 from the outside and can effectively prevent the explosion-proof sheet 9 from being affected by the outside.

[0030] Round holes are provided at both ends of the top cover plate 1 corresponding to the positive electrode post 4 and the negative electrode post 3. Both the positive electrode post 4 and the negative electrode post 3 pass through the top cover plate 1 through the round holes and are connected to the connecting piece 12. The round holes are machined according to the dimensions of the positive electrode post 4 and the negative electrode post 3. Thus, the electrode posts pass through the top cover plate 1 and are connected to the connecting piece 12, and then connected to the positive electrode tab and the negative electrode tab to achieve electrical connection.

Claims

1. A heat dissipation top cover structure, including a top cover plate, with a positive electrode post and a negative electrode post provided at both ends of the top cover plate, and a lower plastic provided at the bottom end of the top cover plate, characterized in that, A connecting piece is provided between the positive electrode post and the negative electrode post and the lower plastic. The positive electrode post and the negative electrode post are connected to the connecting piece. A heat-conducting ceramic is provided between the top cover plate and the lower plastic, and the heat-conducting ceramic is located inside the connecting piece. One end of the heat-conducting ceramic is connected to the connecting piece, and the top end of the heat-conducting ceramic is connected to the top cover plate.

2. The heat dissipation top cover structure according to claim 1, characterized in that, Riveting blocks are provided around the outer parts of the positive electrode post and the negative electrode post, and the positive electrode post and the negative electrode post both penetrate through the riveting blocks.

3. The heat dissipation top cover structure according to claim 2, characterized in that, Sealing rings are provided around the outer parts of the positive electrode post and the negative electrode post, and the positive electrode post and the negative electrode post both penetrate through the sealing rings of the riveting blocks. The sealing rings are all located above the riveting blocks.

4. A heat dissipation top cover structure according to claim 1, characterized in that, A negative upper plastic is provided at the top end of the negative electrode post, and a positive upper plastic is provided at the top end of the positive electrode post. The negative upper plastic and the positive upper plastic are both formed by injection molding.

5. The heat dissipation top cover structure according to claim 1, characterized in that, An explosion-proof piece is provided in the middle of the top cover plate. A pressure relief hole penetrating through the top cover plate is provided at the bottom end of the top cover plate, and the explosion-proof piece is located in the pressure relief hole.

6. The heat dissipation top cover structure according to claim 5, characterized in that, An explosion-proof valve sticker is provided at the top end of the explosion-proof piece. The explosion-proof valve sticker is located in the pressure relief hole. After the explosion-proof piece and the explosion-proof valve sticker are combined, they do not exceed the end face of the top cover plate.

7. A heat dissipation top cover structure according to claim 1, characterized in that Round holes are provided at the corresponding positions of the two ends of the top cover plate and the positive electrode post and the negative electrode post. The positive electrode post and the negative electrode post both penetrate through the top cover plate through the round holes and are connected to the connecting piece.

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