Battery overcharge protection device

Abstract

A battery overcharge protection device includes a bag in which battery cells are packaged. An electrode tab extends from an end portion of the battery cell to allow current to flow therethrough, and is composed of first and second electrode tab portions. A circuit breaker is provided in the bag, and the circuit breaker is connected to the first and second electrode tabs so as to separate the first and second electrode tabs from each other when the battery cell expands.

Description

technical field [0001] The present disclosure relates to a battery overcharge protection device designed to avoid safety accidents by breaking a circuit through a volume change of a battery cell when the battery cell swells due to abnormal conditions such as overcharging. Background technique [0002] With the development and widespread use of various electronic products, secondary batteries are attracting a lot of attention as energy sources for such electronic products. As a representative secondary battery, a lithium ion secondary battery has been used. Since various combustible substances are contained in such a secondary battery, there may be risks in terms of safety such as heat generation and explosion. [0003] As an example, when overcharging (an abnormal behavior of a battery cell) occurs, the overcharging results in gas generation in the battery cell due to a chemical reaction of the battery cell material. This adversely affects the safety of the battery due to ...

AI Technical Summary

Problems solved by technology

However, this secondary battery still has failure problems

In addition, although the improvement can completely prevent the safety accident when the pouch type battery is abnormally expanded, as the volume of the pouch gradually decreases after the expansion, the electrical connection will be established again, resulting in a safety accident due to the flow of current.

Images