Riveting type lithium battery top cover structure

Abstract

The utility model discloses a riveted lithium battery top cover structure which comprises a top cover body, a positive post, positive upper plastic cement, an insulating spacer, a negative post and negative upper plastic cement, a positive pole mounting hole is formed in the left side of the upper surface of the top cover body, and a negative pole mounting hole is formed in the right side of the upper surface of the top cover body, so that a positive pole and a negative pole are respectively mounted in the corresponding positive pole mounting hole and negative pole mounting hole; positive upper plastic cement is coaxially sleeved on the outer part of the positive pole relative to the upper part of the top cover body and between the positive pole and the upper surface of the top cover body, and negative upper plastic cement is coaxially sleeved on the outer part of the negative pole relative to the upper part of the top cover body and between the negative pole and the upper surface of the top cover body; and the lower ends of the positive pole and the negative pole are respectively and coaxially sleeved with an insulating spacer, and are fixed on the top cover body through riveting flanges. The riveting process is adopted, the yield of the manufactured top cover structure is improved, and the reliability of the top cover structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a riveted lithium battery top cover structure. Background Art

[0002] As a representative of new energy, the demand for lithium batteries is also increasing, which puts higher requirements on the cost of battery top covers and the complexity of processing procedures.

[0003] In the existing top cover structure, the upper plastic connects the pole and the welding ring, and the welding ring is connected to the top cover sheet by welding. The welding process quality rate of this structure is unstable and the welding quality rate is low. Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a riveted lithium battery top cover structure, which adopts a riveting process and eliminates a welding ring, thereby not only improving the yield rate of the manufactured top cover structure, but also improving its reliability.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model is a riveted lithium battery top cover structure, the innovation of which is that it includes a top cover body, a positive pole, a positive pole upper plastic, an insulating gasket, a negative pole and a negative pole upper plastic; a positive pole mounting hole matching the positive pole is embedded on the left side of the upper surface of the horizontally arranged top cover body, and a negative pole mounting hole matching the negative pole is embedded on the right side of the upper surface of the top cover body, so that the positive pole and the negative pole are coaxially mounted on the top cover body. In the corresponding positive pole mounting holes and negative pole mounting holes of the top cover body; a positive pole upper plastic is coaxially sleeved on the outside of the positive pole relative to the upper part of the top cover body and between the positive pole and the upper surface of the top cover body, and a negative pole upper plastic is coaxially sleeved on the outside of the negative pole relative to the upper part of the top cover body and between the negative pole and the upper surface of the top cover body; insulating gaskets are coaxially sleeved at the lower ends of the positive pole and the negative pole, respectively, and fixed to the top cover body by riveting and flanging.

[0006] Preferably, a sealing ring matching the positive electrode column is coaxially sleeved in the positive electrode column mounting hole, and a sealing ring matching the positive electrode column mounting hole is coaxially sleeved in the negative electrode column mounting hole. Each sealing ring is made of fluororubber, and its top is respectively in contact with the plastic on the positive electrode or the plastic on the negative electrode, thereby ensuring that the positive electrode column and the negative electrode column are not in contact with the top cover body.

[0007] Preferably, the plastic on the positive electrode is made of PP insulating plastic, and it covers the outside of the positive electrode column and ensures that the positive electrode column does not contact the top cover body; the plastic on the negative electrode is made of PP insulating plastic, and it covers the outside of the negative electrode column and ensures that the negative electrode column does not contact the top cover body.

[0008] Preferably, a positive electrode column mounting boss is further provided on the upper surface of the top cover body relative to the position of the positive electrode upper plastic, and a first groove matching the positive electrode column mounting boss is also embedded in the lower surface of the positive electrode upper plastic, the positive electrode column mounting hole is opened at the center of the positive electrode column mounting boss, and the positive electrode upper plastic is covered on the positive electrode column mounting boss, and then the installation of the positive electrode column is positioned through the cooperation of the positive electrode column mounting boss and the first groove.

[0009] Preferably, a negative pole column mounting boss is further provided on the upper surface of the top cover body relative to the position of the negative pole upper plastic, and a second groove matching the negative pole column mounting boss is also embedded in the lower surface of the negative pole upper plastic, the negative pole column mounting hole is opened at the center of the negative pole column mounting boss, and the negative pole upper plastic is covered on the negative pole column mounting boss, and then the installation of the negative pole is positioned through the cooperation of the negative pole column mounting boss and the second groove.

[0010] Preferably, it also includes a positive electrode lower plastic and a negative electrode lower plastic; the positive electrode lower plastic is made of PP insulating plastic, and its upper surface is a boss-like structure, and a third groove matching the upper surface of the positive electrode lower plastic is coaxially embedded in the lower surface of the top cover body relative to the positive electrode column position, and then the installation of the positive electrode lower plastic is positioned by the third groove, and it is ensured that the positive electrode lower plastic does not interfere with the riveting action of the corresponding insulating gasket; the negative electrode lower plastic is made of PP insulating plastic, and its upper surface is a boss-like structure, and a fourth groove matching the upper surface of the negative electrode lower plastic is coaxially embedded in the lower surface of the top cover body relative to the negative electrode column position, and then the installation of the negative electrode lower plastic is positioned by the fourth groove, and it is ensured that the negative electrode lower plastic does not interfere with the riveting action of the corresponding insulating gasket.

[0011] Preferably, the inner diameter of each of the insulating gaskets is slightly larger than the outer diameter of the corresponding positive electrode column or negative electrode column, and a plurality of flow grooves are evenly spaced and embedded along the circumferential direction of the lower surface of each of the insulating gaskets. Each of the flow grooves is rectangular, arc-shaped or triangular, and are arranged along the radial direction of the corresponding insulating gasket, thereby ensuring the fluidity of the electrolyte through the flow grooves.

[0012] Preferably, an explosion-proof opening is provided on the top cover body between the positive electrode column and the negative electrode column, and a protective sheet for sealing the explosion-proof opening is provided on the upper surface of the top cover body relative to the position of the explosion-proof opening; an explosion-proof valve is provided on the inner bottom surface of the explosion-proof opening of the top cover body, and the outlet end of the explosion-proof valve is communicated with the explosion-proof opening.

[0013] Preferably, a liquid injection hole structure is further provided between the top cover body and the explosion-proof opening relative to the positive electrode column.

[0014] Beneficial effects of the utility model:

[0015] (1) The utility model adopts riveting technology and eliminates the welding ring, which not only improves the yield rate of the manufactured top cover structure, but also improves its reliability;

[0016] (2) The utility model effectively increases the fluidity of the electrolyte by providing a flow groove on the insulating gasket, thereby preventing a short circuit caused by crystallization due to electrolyte retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The utility model is a structural schematic diagram of a riveted lithium battery top cover structure.

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the insulating gasket.

[0020] Among them, 1-top cover body; 2-positive pole; 3-positive pole upper plastic; 4-sealing ring; 5-insulating gasket; 6-positive pole lower plastic; 7-negative pole; 8-negative pole upper plastic; 9-negative pole lower plastic; 10-explosion-proof valve; 11-protective sheet; 12-liquid injection hole structure; 13-circulation slot. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be clearly and completely described below through specific implementation methods.

[0022] The utility model discloses a riveted lithium battery top cover structure, comprising a top cover body 1, a positive pole 2, a positive pole upper plastic 3, an insulating gasket 5, a negative pole 7 and a negative pole upper plastic 8; the specific structure is as follows Figure 1 , Figure 2As shown, a positive pole mounting hole matching the positive pole 2 is embedded on the left side of the upper surface of the horizontally arranged top cover body 1, and a negative pole mounting hole matching the negative pole 7 is embedded on the right side of the upper surface thereof, so that the positive pole 2 and the negative pole 7 are coaxially mounted in the corresponding positive pole mounting hole and negative pole mounting hole of the top cover body 1 respectively; a positive pole upper plastic 3 is coaxially sleeved on the outside of the positive pole 2 relative to the upper part of the top cover body 1 and between the positive pole 2 and the upper surface of the top cover body 1, and a negative pole upper plastic 8 is coaxially sleeved on the outside of the negative pole 7 relative to the upper part of the top cover body 1 and between the negative pole 7 and the upper surface of the top cover body 1; insulating gaskets 5 are coaxially sleeved on the lower ends of the positive pole 2 and the negative pole 7, respectively, and fixed to the top cover body 1 by riveting and flanging.

[0023] like Figure 1 As shown, a sealing ring 4 matching with it is coaxially sleeved on the positive electrode column 2 relative to the positive electrode column mounting hole, and on the negative electrode column 7 relative to the negative electrode column mounting hole. Each sealing ring 4 is made of fluororubber, and its top is respectively in contact with the plastic 3 on the positive electrode or the plastic 8 on the negative electrode, thereby ensuring that the positive electrode column 2 and the negative electrode column 7 are not in contact with the top cover body 1.

[0024] The positive electrode plastic 3 of the present invention is made of PP insulating plastic, and covers the outside of the positive electrode column 2 and ensures that the positive electrode column 2 does not contact the top cover body 1; Figure 1 As shown, a positive pole column mounting boss is further provided on the upper surface of the top cover body 1 relative to the positive pole upper plastic 3, and a first groove matching the positive pole column mounting boss is also embedded on the lower surface of the positive pole upper plastic 3, the positive pole column mounting hole is provided at the center of the positive pole column mounting boss, and the positive pole upper plastic 3 is covered on the positive pole column mounting boss, and then the installation of the positive pole column 2 is positioned through the cooperation of the positive pole column mounting boss and the first groove.

[0025] The negative electrode plastic 8 of the present invention is made of PP insulating plastic, and covers the outside of the negative electrode column 7 and ensures that the negative electrode column 7 does not contact the top cover body 1; Figure 1 As shown, a negative pole column mounting boss is provided on the upper surface of the top cover body 1 relative to the negative pole upper plastic 8, and a second groove matching the negative pole column mounting boss is embedded in the lower surface of the negative pole upper plastic 8, the negative pole column mounting hole is provided at the center of the negative pole column mounting boss, and the negative pole upper plastic 8 is covered on the negative pole column mounting boss, and then the installation of the negative pole column 7 is positioned through the cooperation of the negative pole column mounting boss and the second groove.

[0026] like Figure 1As shown, the positive electrode lower plastic 6 is made of PP insulating plastic, and its upper surface is a boss-like structure. A third groove matching the upper surface of the positive electrode lower plastic 6 is coaxially embedded in the lower surface of the top cover body 1 relative to the positive electrode column 2, so that the installation of the positive electrode lower plastic 6 is positioned through the third groove, and it is ensured that the positive electrode lower plastic 6 does not interfere with the riveting action of the corresponding insulating gasket 5.

[0027] like Figure 1 As shown, the negative electrode lower plastic 9 is made of PP insulating plastic, and its upper surface is a boss-like structure. A fourth groove matching the upper surface of the negative electrode lower plastic 9 is coaxially embedded in the lower surface of the top cover body 1 relative to the position of the negative electrode column 7, so that the installation of the negative electrode lower plastic 9 is positioned through the fourth groove, and it is ensured that the negative electrode lower plastic 9 does not interfere with the riveting action of the corresponding insulating gasket 5.

[0028] The inner diameter of each insulating gasket 5 of the utility model is slightly larger than the outer diameter of the corresponding positive pole 2 or negative pole 7, and a plurality of flow grooves 13 are evenly spaced and embedded along the circumferential direction on the lower surface of each insulating gasket 5. Figure 1 , Figure 2 As shown, each flow slot 13 is rectangular, arc-shaped or triangular, and is arranged along the radial direction of the corresponding insulating gasket 5, thereby ensuring the fluidity of the electrolyte through the flow slot 13. The utility model provides the flow slot 13, when the electrolyte inside the lithium battery flows to the pole, the electrolyte can flow back into the lithium battery through the flow slot 13 and the gap between the inner hole of the insulating gasket 5 and the corresponding pole, thereby increasing the fluidity of the electrolyte and preventing short circuit caused by crystallization due to electrolyte retention.

[0029] like Figure 1 As shown, an explosion-proof opening is further provided on the top cover body 1 between the positive electrode column 2 and the negative electrode column 7, and a protective sheet 11 for sealing the explosion-proof opening is further provided on the upper surface of the top cover body 1 relative to the explosion-proof opening; an explosion-proof valve 10 is further provided on the inner bottom surface of the explosion-proof opening of the top cover body 1, and the outlet end of the explosion-proof valve 10 is connected to the explosion-proof opening, so that when the internal pressure of the lithium battery is too high, the formed gas is discharged to the outside through the outlet end of the explosion-proof valve 10; an injection hole structure 12 is further provided between the top cover body 1 relative to the positive electrode column 2 and the explosion-proof opening.

[0030] Beneficial effects of the utility model:

[0031] (1) The utility model adopts riveting technology and eliminates the welding ring, which not only improves the yield rate of the manufactured top cover structure, but also improves its reliability;

[0032] (2) The utility model effectively increases the fluidity of the electrolyte by providing the flow groove 13 on the insulating gasket 5, thereby preventing a short circuit caused by the formation of crystals due to the retention of the electrolyte.

[0033] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A riveted lithium battery top cover structure, characterized in that: The invention comprises a top cover body, a positive pole, a positive pole upper plastic, an insulating gasket, a negative pole and a negative pole upper plastic; a positive pole mounting hole matching the positive pole is embedded on the left side of the upper surface of the horizontally arranged top cover body, and a negative pole mounting hole matching the negative pole is embedded on the right side of the upper surface, so that the positive pole and the negative pole are coaxially mounted in the corresponding positive pole mounting hole and negative pole mounting hole of the top cover body respectively; the positive pole upper plastic is coaxially sleeved on the outside of the positive pole relative to the upper part of the top cover body and between the positive pole and the upper surface of the top cover body, and the negative pole upper plastic is coaxially sleeved on the outside of the negative pole relative to the upper part of the top cover body and between the negative pole and the upper surface of the top cover body; insulating gaskets are coaxially sleeved on the lower ends of the positive pole and the negative pole, respectively, and fixed to the top cover body by riveting and flanging.

2. The riveted lithium battery top cover structure according to claim 1, characterized in that: A sealing ring matching the positive electrode column is coaxially sleeved in the positive electrode column mounting hole and in the negative electrode column mounting hole. Each sealing ring is made of fluororubber, and its top is respectively in contact with the plastic on the positive electrode or the plastic on the negative electrode, thereby ensuring that the positive electrode column and the negative electrode column are not in contact with the top cover body.

3. The riveted lithium battery top cover structure according to claim 1, characterized in that: The plastic on the positive electrode is made of PP insulating plastic, and it covers the outside of the positive electrode column and ensures that the positive electrode column does not contact the top cover body; the plastic on the negative electrode is made of PP insulating plastic, and it covers the outside of the negative electrode column and ensures that the negative electrode column does not contact the top cover body.

4. The riveted lithium battery top cover structure according to claim 3, characterized in that: A positive pole column mounting boss is also provided on the upper surface of the top cover body relative to the position of the positive pole upper plastic, and a first groove matching the positive pole column mounting boss is also embedded in the lower surface of the positive pole upper plastic, the positive pole column mounting hole is opened at the center of the positive pole column mounting boss, and the positive pole upper plastic is covered on the positive pole column mounting boss, and then the installation of the positive pole is positioned through the cooperation of the positive pole column mounting boss and the first groove.

5. The riveted lithium battery top cover structure according to claim 3, characterized in that: A negative pole column mounting boss is also provided on the upper surface of the top cover body relative to the position of the negative pole upper plastic, and a second groove matching the negative pole column mounting boss is embedded in the lower surface of the negative pole upper plastic, the negative pole column mounting hole is opened at the center of the negative pole column mounting boss, and the negative pole upper plastic is covered on the negative pole column mounting boss, and then the installation of the negative pole is positioned through the cooperation of the negative pole column mounting boss and the second groove.

6. The riveted lithium battery top cover structure according to claim 1, characterized in that: It also includes a positive electrode lower plastic and a negative electrode lower plastic; the positive electrode lower plastic is made of PP insulating plastic, and its upper surface is a boss-shaped structure, and a third groove matching the upper surface of the positive electrode lower plastic is coaxially embedded in the lower surface of the top cover body relative to the positive electrode column position, and then the installation of the positive electrode lower plastic is positioned by the third groove, and it is ensured that the positive electrode lower plastic does not interfere with the riveting action of the corresponding insulating gasket; the negative electrode lower plastic is made of PP insulating plastic, and its upper surface is a boss-shaped structure, and a fourth groove matching the upper surface of the negative electrode lower plastic is coaxially embedded in the lower surface of the top cover body relative to the negative electrode column position, and then the installation of the negative electrode lower plastic is positioned by the fourth groove, and it is ensured that the negative electrode lower plastic does not interfere with the riveting action of the corresponding insulating gasket.

7. The riveted lithium battery top cover structure according to claim 1, characterized in that: The inner diameter of each insulating gasket is slightly larger than the outer diameter of the corresponding positive electrode column or negative electrode column, and a plurality of flow grooves are evenly spaced and embedded along the circumferential direction of the lower surface of each insulating gasket. Each flow groove is rectangular, arc-shaped or triangular, and is arranged along the radial direction of the corresponding insulating gasket, thereby ensuring the fluidity of the electrolyte through the flow groove.

8. The riveted lithium battery top cover structure according to claim 1, characterized in that: An explosion-proof opening is also provided on the top cover body between the positive pole and the negative pole, and a protective sheet for sealing the explosion-proof opening is also provided on the upper surface of the top cover body relative to the position of the explosion-proof opening; an explosion-proof valve is also provided on the inner bottom surface of the explosion-proof opening of the top cover body, and the outlet end of the explosion-proof valve is connected to the explosion-proof opening.

9. The riveted lithium battery top cover structure according to claim 8, characterized in that: A liquid injection hole structure is also arranged between the top cover body and the positive pole and the explosion-proof opening.

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