CN-224232761-U - Battery cover plate assembly and cylindrical battery thereof

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cover plate assembly and a cylindrical battery thereof. The battery cover plate assembly comprises a separation sheet and an end cover, wherein a positive pole column is arranged between the separation sheet and the end cover, a mounting hole is formed in the separation sheet, a clearance hole is formed in the end cover, the bottom end of the positive pole column is clamped in the mounting hole, the top end of the positive pole column penetrates through the clearance hole to extend to the upper portion of the end cover, an annular blocking and connecting portion integrally formed with the positive pole column is arranged on the outer diameter of the positive pole column, an insulating sealing glue layer is arranged on the upper end face of the annular blocking and connecting portion, and the end cover is in insulating sealing and fixed connection with the positive pole column through the insulating sealing glue layer. The battery cover plate component effectively prevents the leakage risk of the traditional riveting structure caused by virtual riveting, and on the other hand, the structure has extremely stable sealing performance in the high-temperature, high-humidity and high-low temperature alternate environments without the leakage risk.

Inventors

• WANG ZHENG
• WANG QILIN

Assignees

• 深圳市思源智科科技有限公司

Dates

Publication Date

20260512

Application Date

20250521

Claims (9)

1. 1. A battery cover plate component comprises a spacing block and an end cover, a positive pole post is arranged between the spacing block and the end cover, and is characterized in that, The bottom end of the positive pole post is clamped in the mounting hole, and the top end of the positive pole post penetrates through the clearance hole to extend to the upper part of the end cover; An annular blocking and connecting part which is integrally formed with the positive electrode post is arranged on the outer diameter of the positive electrode post, an insulating sealing glue layer is arranged on the upper end face of the annular blocking and connecting part, and the end cover is in insulating sealing fixed connection with the positive electrode post through the insulating sealing glue layer; The diameter of the clearance hole is larger than that of the positive pole post.
2. 2. The battery cover plate assembly according to claim 1, wherein the bottom end edge of the positive electrode post is in a chamfer structure, an annular clamping groove is formed between the annular blocking portion and the bottom end of the positive electrode post, and the positive electrode post is clamped in the mounting hole through the annular clamping groove.
3. 3. The battery cover plate assembly according to claim 1, wherein an annular groove is formed between the annular blocking portion and the top end of the positive electrode post, and UV curable glue is arranged in the annular groove.
4. 4. A battery cover plate assembly according to claim 3, wherein the UV curable glue has a diameter greater than the diameter of the positive electrode post, and the bottom surface of the end cap is provided with a clearance space around the clearance hole.
5. 5. The battery cover plate assembly according to claim 1, wherein the isolating sheet is provided with an explosion-proof valve, the end cover is provided with a protecting sheet coaxial with the explosion-proof valve, and the protecting sheet is provided with a pressure relief hole.
6. 6. The battery cover plate assembly according to claim 1, wherein the end cap and the spacer are respectively provided with a concentric liquid injection hole, and the liquid injection hole of the end cap is encapsulated with a sealing cover.
7. 7. The battery cover plate assembly according to claim 1, wherein the upper end face of the spacer is provided with a positioning column, and the bottom face of the end cover is provided with a positioning hole matched with the positioning column.
8. 8. The cylindrical battery comprises a shell, a battery cell and the battery cover plate assembly according to any one of claims 1-7, and is characterized in that an annular sinking table is arranged at the bottom of the circumferential edge of the end cover, the annular sinking table is clamped at an opening at the upper end of the shell, the end cover is welded with the shell, and the battery cell is packaged in the shell.
9. 9. The cylindrical battery according to claim 8, wherein a bus bar is connected to the bottom end of the positive electrode post, the positive electrode tab of the battery cell is connected to the bus bar, and the negative electrode tab of the battery cell is connected to the housing.

Description

Battery cover plate assembly and cylindrical battery thereof Technical Field The utility model relates to the technical field of lithium batteries, in particular to a battery cover plate assembly and a cylindrical battery thereof. Background The cylindrical battery is a battery with high capacity, long cycle life and wide use environment temperature, and along with the development of new energy industry, higher requirements are put on the energy density, cycle life, safety and reliability of the battery. In the prior art, the polar column of the cylindrical battery and the cover plate component are in sealing and fixed connection in a riveting mode, namely, the polar column is riveted and fixed on the cover plate after the sealing ring is compressed, but the phenomenon of virtual riveting occurs at a certain probability in the riveting process, so that the electrolyte is in risk of leakage. On the other hand, the sealing performance of the riveted structure is extremely unstable under the environment of high temperature, high humidity and high and low temperature alternation, and the risk of liquid leakage exists. Therefore, there is a need for a battery cover assembly and a cylindrical battery thereof to solve the above problems. Disclosure of utility model Based on the above, the utility model aims to provide a battery cover plate assembly and a cylindrical battery thereof, so as to solve the problem that in the prior art, a riveting sealing structure between a pole column of the cylindrical battery and the cover plate assembly has a leakage risk. In order to solve the technical problems, the utility model adopts the following technical scheme: The utility model provides a battery cover plate assembly, which comprises a separation sheet and an end cover, wherein a positive pole column is arranged between the separation sheet and the end cover, a mounting hole is arranged on the separation sheet, and a clearance hole is arranged on the end cover; The outer diameter of the positive pole post is provided with an annular blocking and connecting part which is integrally formed with the positive pole post, the upper end face of the annular blocking and connecting part is provided with an insulating sealing glue layer, and the end cover is in insulating sealing fixed connection with the positive pole post through the insulating sealing glue layer, wherein the diameter of the clearance hole is larger than that of the positive pole post. As an alternative technical scheme of battery cover plate assembly, the bottom edge of anodal post is chamfer structure, annular fender joint portion with be equipped with annular joint groove between the bottom of anodal post, anodal post passes through annular joint groove joint in the mounting hole. As an alternative technical scheme of battery cover plate assembly, be equipped with annular groove between annular fender portion with the top of anodal post, be equipped with UV curing glue in the annular groove. As an alternative technical scheme of the battery cover plate assembly, the diameter of the UV curing adhesive is larger than that of the positive pole post, and a clearance hole is formed in the bottom surface of the end cover in a surrounding mode. As an alternative technical scheme of battery cover plate assembly, be equipped with the explosion-proof valve on the spacer, install on the end cover with the protection piece of explosion-proof valve coaxial, be equipped with the pressure release hole on the protection piece. As an alternative technical scheme of the battery cover plate assembly, the end cover and the isolating sheet are respectively provided with a liquid injection hole with the same axis, and the liquid injection hole of the end cover is packaged with a sealing cover. As an alternative technical scheme of battery cover plate assembly, the up end of spacer is equipped with the reference column, the bottom surface of end cover be equipped with reference column assorted locating hole. On the other hand, the utility model also provides a cylindrical battery, which comprises a shell, a battery cell and the battery cover plate assembly, wherein an annular sinking table is arranged at the bottom of the circumferential edge of the end cover, the annular sinking table is clamped at the opening of the upper end of the shell, the end cover is welded with the shell, and the battery cell is packaged in the shell. As an alternative technical scheme of the cylindrical battery, the bottom end of the positive electrode post is connected with a bus plate, the positive electrode lug of the battery core is connected with the bus plate, and the negative electrode lug of the battery core is connected with the shell. The beneficial effects of the utility model are as follows: The battery cover plate assembly comprises a separation sheet and an end cover, wherein a positive pole column is arranged between the separation sheet and the end cover, a mounting hole is formed in the s