Secondary Battery and Secondary Battery Pack Having the Same

Abstract

Provided are a secondary battery and a secondary battery pack having the same capable of preventing performance degradation by preventing an increase in an interface resistance of an electrode body accommodated in a pouch and capable of improving stability by preventing deformation of the electrode body to thereby prevent a fine short circuit even though the pouch is swelled due to a gas generate at a high temperature, by providing first members for reinforcing rigidity and second members deformed at the high temperature and capable of adhering the electrode body to one side or both sides of the electrode body accommodated and sealed in the pouch.

Description

technical field [0001] The present invention relates to a method that prevents containment in bags A secondary battery and a secondary battery pack including the secondary battery that can improve safety by preventing performance degradation by increasing the interface resistance of the internal electrode body and preventing micro-short circuit by preventing deformation of the electrode body. Background technique [0002] In general, secondary batteries, unlike primary batteries, can be charged and discharged, so they are suitable for use in various fields such as digital cameras, mobile phones, notebook computers, and hybrid vehicles, and active research is being conducted on them. The secondary battery may, for example, be a nickel-cadmium battery, a nickel metal-hydrogen battery, a nickel-hydrogen battery or a lithium secondary battery. Also, among secondary batteries, lithium secondary batteries having high energy density and discharge voltage have been studied a lot, ...

AI Technical Summary

Problems solved by technology

[0005] However, such a pouch-type secondary battery is caused by the temperature rise caused by charging and discharging, and gas is generated inside the pouch at high temperature, resulting in swelling of the pouch (swelling), so the interfacial resistance of the electrode body increases, resulting in secondary Problems with degraded battery performance

In addition, there is a problem that the electrode body is deformed due to the expansion phenomenon, and a micro-short circuit occurs, so there is a problem that the risk of fire is increased.

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