The safety of lithium-ion batteries for coal mines is that the smoke, fire or explosion are forbidden under various test conditions, without personal harm under the conditions of battery abuse. From the aspects of lithium ion battery design and manufacturing process, the factors affecting the safety performance of lithium ion batteries were analyzed, and further the key issues of lithium ion battery pack safety was studied, the safety of lithium ion batteries through two ways were improved to solve the lithium ion battery safety issues.