CN-224217574-U - Battery top cover and battery shell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery shell. The battery top cover comprises a cover plate with a first mounting hole, a pole column arranged in the first mounting hole, a pressing plate arranged on the upper side surface of the cover plate and used for pressing the pole column, an upper isolating piece used for isolating the pressing plate and the cover plate, a sealing ring arranged in the first mounting hole and sleeved on the periphery of the pole column in a surrounding mode, a lower isolating piece and a switching piece arranged on the lower side surface of the cover plate and used for isolating the pole column and the cover plate, wherein the pole column comprises a pole column body, a disc coaxially arranged at the lower end of the pole column body and a boss coaxially arranged on the lower side surface of the disc, and a second mounting hole is arranged on the switching piece, and the boss penetrates through the second mounting hole and is welded with the switching piece.

Inventors

• WANG LIDONG
• LIU XIAOLONG

Assignees

• 深圳市长盈精密技术股份有限公司
• 广东长盈精密技术有限公司

Dates

Publication Date

20260508

Application Date

20250529

Claims (10)

1. 1. The battery top cover comprises a cover plate with a first mounting hole, a pole column arranged in the first mounting hole, a pressing plate arranged on the upper side surface of the cover plate and used for pressing the pole column, an upper isolating piece used for isolating the pressing plate and the cover plate, a sealing ring arranged in the first mounting hole and sleeved on the periphery of the pole column in a surrounding mode, a lower isolating piece arranged on the lower side surface of the cover plate and used for isolating the pole column and the cover plate, and a transfer plate.
2. 2. The battery top cover of claim 1, wherein the boss and the second mounting hole are welded together using a laser welding process.
3. 3. The battery top cover of claim 1, wherein the adapter piece comprises a first adapter piece which is horizontally distributed and a second adapter piece which is connected with the edge of the first adapter piece and vertically distributed, the first adapter piece is provided with the second mounting hole at the position corresponding to the boss, and the second adapter piece is used for connecting the lug.
4. 4. The battery top cover of claim 1, wherein the pole body is provided with a first section with a diameter smaller than the aperture of the first mounting hole and a riveting section coaxially formed at the upper end of the first section, the riveting section is provided with a second section with a diameter smaller than the diameter of the first section and a third section with a diameter larger than the diameter of the second section, the first section penetrates through the first mounting hole, the upper end face of the first section is abutted against the lower side face of the pressing plate, and the pressing plate is coaxially provided with a step riveting hole which surrounds the peripheries of the second section and the third section.
5. 5. The battery top cover of claim 4, wherein the upper side of the cover plate is formed with a first press-fit ring groove surrounding the outer periphery of the first mounting hole, the bottom surface of the first press-fit ring groove is lower than the upper side of the cover plate, the upper spacer is provided with a surrounding wall surrounding the outer periphery of the pressing plate, a bottom wall formed between the lower side of the pressing plate and the upper side of the cover plate, a first through hole formed on the bottom wall and coaxial with the first mounting hole, and a press-fit convex ring protruding downwards from the bottom wall to the bottom surface of the first press-fit ring groove, and the press-fit convex ring coaxially surrounds the outer periphery of the first through hole.
6. 6. The battery top cover of claim 5, wherein the aperture of the first through hole is matched with the diameter of the first section, the inner diameter of the press-fit convex ring is matched with the aperture of the first mounting hole, and the inner diameter of the press-fit convex ring and the aperture of the first mounting hole are both larger than the diameter of the first section and are matched with the diameter of the sealing ring.
7. 7. The battery top cover of claim 5, wherein a first groove is formed in the cover plate at a position corresponding to the pressing plate, the planar size of the first groove is matched with that of the upper separator, the bottom wall of the upper separator is accommodated in the first groove, and the first press-fit ring groove and the first mounting hole are formed in the bottom surface of the first groove.
8. 8. The battery top cover of claim 5, wherein the outer side of the pressure plate is configured as a first concave-convex mating surface and the inner side of the surrounding wall is configured as a second concave-convex mating surface that mates with the first concave-convex mating surface, or The outer side surface of the upper section of the pressing plate protrudes outwards from the outer side surface of the lower section of the pressing plate, a first step is formed between the upper section of the pressing plate and the lower section of the pressing plate, the inner side surface of the upper section of the surrounding wall is outwards concave from the inner side surface of the lower section of the surrounding wall, and a second step matched with the first step is formed between the upper section of the surrounding wall and the lower section of the surrounding wall.
9. 9. The battery top cover according to claim 5, wherein a second through hole coaxial with the first mounting hole is formed in the position, corresponding to the pole body, of the lower separator, the aperture of the second through hole is larger than that of the first mounting hole and smaller than that of the disc, the sealing ring is sleeved on the periphery of the pole body, the sealing ring is provided with a first sealing ring pressed between the upper side surface of the disc and the lower side surface of the lower separator, a second sealing ring protruding on the upper side surface of the first sealing ring and having an outer diameter smaller than that of the first sealing ring, and a third sealing ring protruding on the upper side surface of the second sealing ring and having an outer diameter smaller than that of the second sealing ring, the upper side surface of the second sealing ring is tightly matched with the lower side surface of the cover plate, the third sealing ring is arranged in the first mounting hole and the press-fitting convex ring in a penetrating manner, and the upper side surface of the third sealing ring is tightly matched with the lower side surface of the upper separator.
10. 10. A battery case characterized by comprising the battery top cover according to any one of claims 1 to 9.

Description

Battery top cover and battery shell Technical Field The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery shell. Background With the rapid development of industries such as electric vehicles, energy storage devices, etc., secondary batteries have become a major energy storage device. Due to the fact that global petroleum resources are reduced and environmental pressure is increased, new energy storage equipment with green and environment protection is developed, and the new energy storage equipment becomes a hot spot for the transformation of green industrial technology. The secondary battery has high energy density and portability, and is successfully applied to the fields of 3C consumer electronics, new energy automobiles, photovoltaic energy storage and the like. The secondary battery generally includes a case, a battery cell disposed in the case, and a battery top cap assembly disposed at an upper side of the case. The battery top cover component is a core component for guaranteeing the safety and sealing of the secondary battery, and plays important roles of current conduction, safety explosion prevention and the like. The battery top cover generally includes a cover plate, a pole, a sealing ring, an upper separator, a lower separator, and the like. In the prior art, the pole generally comprises a pole body and a rectangular chassis integrally formed on the lower end surface of the pole body, and the rectangular chassis is welded on the adapter plate so as to be connected with the pole lug through the adapter plate. In the manufacturing process of the pole, the rectangular chassis and the pole body need to be molded by a cold heading process and a machining process in sequence. In the welding process of the rectangular chassis and the adapter plate, because the contact area is larger, ultrasonic welding is often needed to be adopted between the rectangular chassis and the adapter plate, the ultrasonic welding pressing force is larger, the adapter plate is easy to deform, and then gaps exist between the rectangular chassis of the pole and the adapter plate due to deformation, so that the conductivity is reduced. In addition, the eccentric arrangement between the pole body and the rectangular chassis leads to higher material waste and low material utilization rate, and improves the product cost. Disclosure of utility model Aiming at the defects of the prior art, the utility model aims to provide a battery top cover and a battery shell. In order to solve the technical problems, the utility model provides a battery top cover, which comprises a cover plate with a first mounting hole, a pole column arranged in the first mounting hole, a pressing plate arranged on the upper side surface of the cover plate and press-fitting the pole column, an upper isolation piece used for isolating the pressing plate and the cover plate, a sealing ring arranged in the first mounting hole and sleeved on the periphery of the pole column in a ring mode, a lower isolation piece and a switching piece arranged on the lower side surface of the cover plate and used for isolating the pole column and the cover plate, wherein the pole column comprises a pole column body, a disc coaxially arranged at the lower end of the pole column body and a boss coaxially arranged at the lower side surface of the disc, and a second mounting hole is arranged on the switching piece, and the boss is arranged in the second mounting hole in a penetrating mode and is welded with the switching piece. Further, the boss and the second mounting hole are welded together by a laser welding process. Further, the switching piece includes the first switching piece of horizontal distribution and with the edge connection of first switching piece just the second switching piece of vertical distribution, be provided with on the first switching piece correspond to the position department of boss the second mounting hole, the second switching piece is used for connecting the utmost point ear. Further, the pole body is provided with a first section with a diameter smaller than that of the first mounting hole and a riveting section coaxially formed at the upper end of the first section, the riveting section is provided with a second section with a diameter smaller than that of the first section and a third section with a diameter larger than that of the second section, the first section penetrates through the first mounting hole, the upper end face of the first section is abutted to the lower side face of the pressing plate, and the pressing plate is coaxially provided with a step riveting hole which surrounds the peripheries of the second section and the third section. Further, the upper side of the cover plate is provided with a first press-fit ring groove surrounding the periphery of the first mounting hole, the bottom surface of the first press-fit ring groove is lower than the upper side of the cover plate, t