Analysis and Summary of 24V System Battery Solution Project

一、 Project Background and Customer Requirements

1. Customer core requirement: Build a 24V power supply system and plan to use two existing purchased "12.8V 150Ah lithium iron phosphate batteries" in series to avoid purchasing additional 24V specification battery items and reduce costs and inventory pressure.

2. Customer core concern: Worried that when two batteries are used in series, issues such as battery mismatch and voltage difference may lead to reduced lifespan or unstable performance. Therefore, they hope to install an additional battery balancer to ensure system reliability.

二、 Research results on equalizer selection

Based on customer needs, we will focus on researching two equalizer products, and the specific compatibility analysis is as follows:

三、Supplementary conclusions of the research

The core application scenario of the two equalizers is lead-acid battery systems. Due to the rapid lifespan decay and prominent voltage imbalance of lead-acid batteries during long-term series/parallel use, equalizers are required to maintain performance; The characteristics of lithium iron phosphate batteries used by customers are fundamentally different from lead-acid batteries, and there is no need to rely on such equalizers.

1、 Core considerations for series/parallel connection of lithium iron phosphate batteries (key recommendations for customers)

In response to the customer's requirement to build a 24V system using two 12.8V lithium iron phosphate batteries in series, and taking into account the characteristics of lithium batteries, the following operating procedures must be strictly followed to avoid mismatch issues:

2. Specification for series operation: New batteries with consistent capacity must be selected (preferably batteries from the same batch) to ensure consistent battery charge and decay rate, reducing the risk of voltage difference after series connection from the source. (Set up your own group to ensure consistent electrical charge)

3. Parallel operation specifications: Before parallel connection, the battery voltage should be checked to ensure that the voltage difference is small enough, so that the instantaneous current of parallel connection is less than the short-circuit current of the protection board, and to avoid impact damage to the battery or protection board.