Method of end sealing for battery

Abstract

This invention relates to a battery closure head method, including the following processes: providing a battery can and a matched head cover; use gripping device to fix the can and the head cover, the can spins around the axle wire, and the head cover spins around the same axle wire in negative direction, and gradually get near; when the spinning can contacts the head cover, the can and the head cover produce heat through friction, till to the plastic melting state, add opposite upset pressure on the can and the head cover at the same time of frictional heat, and make the can and the head cover joint. The advantages are good sealing and low cost.

Description

【Technical field】 [0001] The invention relates to a battery capping method, in particular to a circular battery capping method. 【Background technique】 [0002] The prior art circular battery sealing methods, namely the method of sealing the tank body and the upper cover of the battery, mainly include laser welding and rivet riveting. [0003] A Chinese patent published on April 16, 1997 with application number 96109245.9 discloses a battery sealed by laser welding technology. The use of laser welding technology can make the cover of the battery achieve good sealing. However, the equipment cost of laser welding technology is expensive, and the large-scale application in industry will increase the cost burden. [0004] The riveting method has the disadvantages of easy leakage of electrolyte and poor sealing. Generally, batteries riveted with rivets have a seal. The seal is made of alkali-resistant and high-temperature-resistant material, and is used to seal the electrolyte....

AI Technical Summary

Problems solved by technology

However, existing seals are made of nylon or rubber materials: nylon seals are relatively hard and difficult to undergo plastic deformation. In order to seal reliably, the flatness, At the same time, high requirements are placed on riveting machines and fixtures. A little carelessness will cause leakage or poor contact, which will lead to an increase in contact resistance; rubber seals have great elasticity, and rivets are easy to be shaken. Leakage is caused, which is extremely inconvenient and unreliable in actual operation. The rubber seal is easy to fall off and the phenomenon of short circuit between the rivet and the shell occurs.

Images