Cell cover cap combination and cylindrical secondary cell

Abstract

The invention relates to a cell cover cap combination. The combination comprises a seal cover, a substrate, a pressure protection device, and an electrode lead-out end. The seal cover comprises a first convex platform for supporting the pressure protection device and the electrode lead-out end. One end of the substrate is connected with the pressure protection device and the other end of the substrate is connected with an electrode lug of a positive and negative electrode winding. The pressure protection device is conducted with the electrode lead-out end. A second convex platform for supporting the substrate is arranged below the first convex platform of the seal cover. The invention also relates to a related cylindrical cell. In the invention, a seal cover of the cell cover cap combination is provided with a first convex platform for supporting a pressure protection device and an electrode lead-out end, and a second convex platform which is utilized for supporting a substrate and is arranged below the first convex platform, thus an influence of an extrusion-type sealing process on a substrate is restricted thereby avoiding the problem that an electrode lug falls off to cause a zero potential, wherein the sealing process is carried out on the first convex platform.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a battery cap combination and a cylindrical secondary battery which can avoid the problem of zero potential of the positive and negative windings caused by the shedding of tabs. Background technique [0002] Due to its high energy density and portability, lithium-ion secondary batteries have become an essential secondary power source for portable electronic devices such as digital cameras and video cameras. Cylindrical secondary batteries are relatively standard and commonly used battery products. [0003] Please refer to figure 1 , shows the cap structure of the existing cylindrical secondary battery. Existing cylindrical secondary batteries generally include a battery casing, positive and negative windings, and a battery cap assembly that seals the positive and negative windings. The positive and negative windings are usually put into the battery case without rolling mounting grooves...

AI Technical Summary

Problems solved by technology

When the laminated battery case and cap are combined, the pressure protection sheet 150, temperature protection sheet 164 and electrode lead-out end 160 placed on the boss 172 of the insulating sleeve 170 are simultaneously squeezed by the lower case and the upper case. , it will affect the movement of the substrate 140 suspended under the pressure protection sheet 150, so that the tabs welded to the substrate 140 may break due to pulling, which increases the zero potential problem of the positive and negative windings in the secondary battery manufacturing process

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