Due to the rapid development of power lithium batteries in recent years, there have been considerable breakthroughs in terms of production technology, material technology improvements, or price advantages, so it also lays a solid foundation for multiple parallel strings. The era of replacing lead-acid batteries is getting closer. Regardless of whether electric bicycles or backup power supplies, its market share has naturally begun to expand wildly. This is an undeniable fact. So, for the safety and life of the battery, the effective protection of the lithium battery is naturally indispensable. At this time, the protection board is also one of the very core components in the battery pack.