Power lithium battery matching method

The voltage matching method can be divided into static voltage matching method and dynamic voltage matching method. The static voltage matching method is also called the no-load matching method. It does not carry a load and only considers the battery itself. It measures the self-discharge rate of the fully charged state of the selected single battery after standing for tens of days and the different storage periods in the fully charged state. The open circuit voltage of the internal battery, this method is the simplest operation, but it is not accurate. The dynamic voltage matching method investigates the voltage situation with load, but it does not take into account factors such as load changes, so it is not accurate. 2. The static capacity matching method charges and discharges the battery under the set conditions, calculates the capacity from the discharge current and discharge time, and matches the battery according to the capacity. This method is simple and easy to implement, but it can only reflect that the battery has the same capacity under certain conditions, and cannot explain the complete working characteristics of the battery, and has certain limitations. 3. The internal resistance matching method mainly considers the internal resistance of the single battery. This method can achieve rapid measurement, but because the internal resistance of the battery will change with the progress of the discharge process, it is difficult to accurately determine the internal resistance. . 4. The multi-parameter matching method simultaneously considers the capacity, internal resistance, voltage, self-discharge rate and other external conditions to comprehensively evaluate the battery, and can sort out battery packs with better consistency. However, the premise of this method is that the single-parameter sorting must be accurate and time-consuming. 3.5 Dynamic characteristic grouping method The dynamic characteristic grouping method uses the charge and discharge characteristic curve of the battery to sort the batteries for grouping. The charge-discharge curve can reflect most of the characteristics of the battery, and the use of dynamic characteristics matching method can ensure the consistency of various performance indicators of the battery. There are many data in the dynamic characteristics matching method, which is usually realized by the cooperation of computer programs. In addition, this method reduces the battery pack utilization rate, which is not conducive to reducing the cost of the battery pack. The determination of the standard curve or reference curve is also a difficult point in its implementation. Thermal management of the battery. In addition to keeping the operating temperature of the battery pack within the optimal range, thermal management of the battery should also try to ensure the consistency of the temperature conditions between the batteries, so as to effectively ensure the consistency of performance between the batteries. Use reasonable control strategies. When the output power allows, minimize the depth of battery discharge, and at the same time, prevent the battery from overcharging, which can extend the cycle life of the battery pack. Strengthen the maintenance of battery packs. Carry out low-current maintenance charging of the battery pack at intervals and pay attention to cleaning. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Capacity data and steps of 18650 polymer battery