How to control the capacity of lithium iron phosphate battery pack to be consistent

　　1. At present, the lithium battery management system has been widely used in various industries to control the consistency and safety of the batteries in the battery pack, so as to protect the lithium ion battery pack and extend the service life of the product. The use of the lithium ion battery management system (BMS) can achieve the control of the relative consistency of the battery, so as to prevent the overcharge and discharge that may be caused by the inconsistency of the battery during the use process, and relatively extend the service life of the lithium ion iron phosphate battery pack. The battery management system with balance function solves the inconsistency of the battery pack to a certain extent, thereby maximizing the capacity and energy utilization of the lithium-ion battery pack.

　　2. From the analysis of experimental data, it can be seen that the BMS lithium ion battery pack is charged through the charging and discharging equipment or charger, and the highest voltage often occurs in the early stage of constant voltage charging. Inconsistency of initial small voltage of battery in battery pack is objective. Although the initial voltage inconsistency is small, it can be balanced during constant voltage charging, and the battery voltage inconsistency can be adjusted to a certain extent. However, in the long-term use, under the catalysis of the temperature field, the battery inconsistency in the lithium-ion battery pack will inevitably increase, which may lead to overcharge or overdischarge during the charging and discharging process. Of course, the lithium battery management system is bound to sacrifice the battery charging and discharging capacity to ensure the consistency between batteries on the premise of ensuring safety.

　　3. Next, Topac provided a method to reduce the impact of temperature on battery capacity consistency, accurately measure the actual capacity of lithium iron phosphate battery, and improve the consistency of partial capacity of lithium iron phosphate battery. The specific steps are as follows: 1. Extract several batteries; Select the test temperature range, uniformly set multiple test temperature nodes within the test temperature range, test and count the battery capacity of each battery under each test temperature node; 2. Select the temperature range of the minimum capacity range of lithium iron phosphate battery pack, and the capacity value of each battery within the temperature range is linearly matched with the capacity value of the battery at 25 ℃; 3. Within the temperature range of partial capacity of lithium ion battery, measure the battery capacity of this batch with the same capacity; 4. According to the fitting equation, the discharge capacity of this batch of batteries at 25 ℃ was calculated.

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