How to protect the circuit of lithium battery

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From: Carol

publisher: Carol

Issue Time: Sep 2,2020

Summary

How to protect the circuit of lithium battery

Lithium battery manufacturers will take you to understand that due to the high energy density of lithium ion batteries, it is difficult to ensure the safety of the battery. Lithium battery manufacturers have found that in an overcharged state, the energy will be excessive when the battery temperature rises, so the electrolyte decomposes to produce gas, which may cause spontaneous combustion or rupture due to the increase in internal pressure; on the contrary, in the over-discharged state, the electrolyte will decompose due to decomposition. This leads to deterioration of battery characteristics and durability, thereby reducing the number of rechargeable times.

The protection circuit of the lithium ion battery is to ensure the safety in such an overcharge and discharge state and prevent the deterioration of the characteristics. The protection circuit of the lithium ion battery is composed of a protection IC and two power MOSFETs. The protection IC monitors the battery voltage and switches to an external power MOSFET to protect the battery when it is overcharged and discharged. The function of the protection IC is excessive. Charge protection, over discharge protection and over current/short circuit protection.