CN-224232752-U - Secondary battery top cover and battery

Abstract

The utility model provides a top cover of a secondary battery, which comprises a top cover plate, a lower plastic, a pole assembly, an upper plastic and a sealing ring, wherein the top cover plate is provided with a first pole through hole and a second pole through hole, the lower plastic is connected with the top cover plate, the pole assembly comprises an upper pole and a lower pole, the upper pole penetrates through the first pole through hole and the first through hole and is connected with the lower pole in a welding mode, the upper plastic is arranged between the top cover plate and the upper pole to insulate the upper pole from the top cover plate, the sealing ring comprises a main body part and a flange part, the main body part is arranged on the outer side of the upper pole to seal a gap between the lower plastic and the upper pole part, and the flange part is arranged between the lower plastic and the lower pole to seal the gap between the lower plastic and the lower pole. The secondary battery top cover has the advantages of simple forming process, low production cost, good sealing performance and high safety performance.

Inventors

• HUANG XIAOWEI
• HE QINGQING
• TANG XIAOWEI
• SUN WEN
• ZENG ZHAOLONG
• LI TAO
• Li shuibao
• TAO QIONGCHENG

Assignees

• 江西赣锋锂电科技股份有限公司

Dates

Publication Date

20260512

Application Date

20250331

Claims (10)

1. 1. A secondary battery top cap, comprising: The top cover plate is provided with a first pole through hole and a second pole through hole; A lower plastic provided with a first penetration hole and a second penetration hole, the lower plastic being configured to be connected with the top cover plate; The pole assembly comprises an upper pole and a lower pole, wherein the upper pole penetrates through the first pole through hole and the first penetrating hole, and the upper pole is connected with the lower pole in a welding mode; The upper plastic is arranged between the top cover plate and the upper pole to insulate the upper pole from the top cover plate, and is characterized by further comprising a sealing ring, wherein the sealing ring comprises a main body part and a flange part, the main body part penetrates through the first pole through hole and the first penetrating hole and is positioned at the outer side of the upper pole to seal a gap between the lower plastic and the upper pole part, and the flange part is arranged between the lower plastic and the lower pole to seal a gap between the lower plastic and the lower pole.
2. 2. The secondary battery top cover according to claim 1, wherein the flange portion has a diameter larger than that of the main body portion.
3. 3. The secondary battery top cover according to claim 2, wherein the diameter of the flange portion is 0.1mm to 5mm larger than the diameter of the main body portion.
4. 4. The secondary battery top cover of claim 3, wherein the sealing ring is made of a fluororubber material.
5. 5. The secondary battery top cap according to claim 1, wherein the upper post comprises an upper end portion, a middle portion, and a lower end portion, wherein a cross-sectional area of the upper end portion is larger than a cross-sectional area of the middle portion, and a cross-sectional area of the middle portion is larger than an area of the lower end portion.
6. 6. The secondary battery top cap according to claim 5, wherein the lower terminal is connected to the lower end of the upper terminal by welding.
7. 7. The secondary battery top cap according to claim 5, wherein the diameter of the lower end portion of the pole is 4cm to 18cm.
8. 8. The secondary battery top cover according to claim 1, wherein an upper end of the main body portion of the sealing ring protrudes from the top cover plate and further seals a gap between the upper post and the top cover plate.
9. 9. The secondary battery top cover according to claim 1, wherein the bottom of the upper plastic is further provided with a vent groove.
10. 10. A secondary battery comprising the secondary battery top cover according to any one of claims 1 to 9.

Description

Secondary battery top cover and battery Technical Field The utility model relates to the field of batteries, in particular to a top cover of a secondary battery and the battery. Background The secondary battery (Rechargeable battery) is also called a rechargeable battery or a storage battery, and the secondary battery can activate an active substance in a charging manner after discharging to continue to use, so that the secondary battery gradually becomes a main power source of an electricity utilization system due to the recycling characteristic, but with the vigorous development of new energy, various companies are used for oligomerization of new energy tracks, the fierce competition leads to higher and higher requirements on cost, and in addition, for a new energy electric vehicle, the battery needs to realize a short-time quick charging function, but the direct problem caused by quick charging is that high temperature is caused when a large current passes, so that the battery top cover also needs to have high temperature resistance. Therefore, development of a battery top cover with low cost, high temperature resistance and high cost performance is urgently needed. Currently, the battery top cover commonly used in the market mainly comprises a traditional column top cover, a very simple top cover, a riveted top cover, a binding top cover, a nano top cover and the like, but the conventional battery top cover cannot meet the requirements of customers in the current market, and has low cost, high temperature resistance, high safety and the like. Disclosure of utility model In order to improve high temperature resistance and safety performance of a battery top cover and a battery of the battery top cover and reduce production cost of the battery top cover, the utility model provides a secondary battery top cover which comprises a top cover plate, a lower plastic, a pole assembly and a sealing ring, wherein the top cover plate is provided with a first pole through hole and a second pole through hole, the lower plastic is provided with a first through hole and a second through hole, the lower plastic is connected with the top cover plate, the pole assembly comprises an upper pole and a lower pole, the upper pole penetrates through the first pole through hole and the first through hole, the upper pole and the lower pole are connected in a welding mode, the upper plastic is arranged between the top cover plate and the upper pole to insulate the upper pole from the top cover plate, the sealing ring comprises a main body part and a flange part, the main body part penetrates through the first pole through hole and the first through hole and is partially positioned outside the upper pole to seal a gap between the lower plastic and the upper pole part, and the flange part is arranged between the lower plastic and the lower pole part to seal the gap between the lower plastic and the lower pole. Further, the flange portion has a diameter greater than a diameter of the main body portion. Further, the diameter of the flange portion is 0.1mm to 5mm larger than the diameter of the main body portion. Further, the seal ring is made of fluororubber material. Further, the upper pole comprises an upper end portion, a middle portion and a lower end portion, wherein the cross section area of the upper end portion is larger than that of the middle portion, and the cross section area of the middle portion is larger than that of the lower end portion. Further, the lower pole is connected to the lower end portion of the upper pole portion by welding. Further, the diameter of the lower end portion of the pole is 4 cm-18 cm. Further, the upper end of the main body portion of the seal ring protrudes from the top cover plate and further seals a gap between the upper post and the top cover plate. Further, the bottom of the upper plastic is also provided with an exhaust groove. The utility model also provides a secondary battery comprising the secondary battery top cover. The secondary battery top cover has the advantages of simple forming process, low production cost, good sealing performance and high safety performance. Drawings Fig. 1 is a view showing a secondary battery according to the present utility model schematic view of the top cover; Fig. 2 is an exploded view of the top cap of the secondary battery according to the present utility model; fig. 3 is a schematic view of a top cap of the secondary battery according to another angle of the present utility model; fig. 4 is a schematic view of a top cap of a secondary battery according to still another angle of the present utility model; FIG. 5 is a schematic view in partial cross-section taken along line A-A of FIG. 4; FIG. 6 is a schematic view of a gasket in a top cap of a secondary battery according to the present utility model; fig. 7 is a schematic view of an upper post in the top cap of the secondary battery of the present utility model; fig. 8 is a schematic view of the uppe