Voltage sample and electric quantity balance colinear battery management system and management method

Abstract

The invention discloses a voltage sample and electric quantity balance colinear battery management system and management method. The method comprises the steps of S1, cyclically scanning and sampling a voltage of each battery unit of a battery pack in real time; S2, initiating data synchronization and issuing a balance calculation instruction by a master control module according to specific working condition of the battery pack; S3, calculating and recording balance quantity by a slave control module according to instruction data and voltages collected in real time, wherein the instruction data is sent by the master control module; S4, judging an electric quantity balance state of the battery pack according to a calculation result of the slave control module; S5, stopping scanning and sampling, and calculating and recording an electric quantity balance position of the battery pack; and S6, carrying out electric quantity balance on the battery pack according to the recorded electric quantity balance position. According to the system and the method, the voltage sample and electric balance are realized through a time division multiplexing harness, the voltage sample precision is ensured, the wiring is simplified, and the cost is reduced.

Description

technical field [0001] The invention relates to a battery management system, in particular to a battery management system and a management method in which voltage sampling and power balance are collinear. Background technique [0002] Cell voltage sampling is the most basic function of the battery management system. The battery management system analyzes and processes the data by sampling the battery voltage, and then realizes the battery protection function. It can be said that the single voltage sampling function is the foundation of the management system, and most of the functions of the management system are based on this foundation. When the battery is used for a period of time, due to the inconsistency of the battery manufacturing process, the remaining power of the battery is inconsistent. It is necessary to use two equalization methods of charging and discharging to release a certain amount of power from the battery with more power and charge the battery with less po...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, a charging / discharging balancing loop is required for battery power balancing. There are balancing current and loop internal resistance in the balancing loop. If the same wiring harness is used for voltage sampling and power balancing, the balancing current and loop internal resistance will affect the sampling Voltage

[0004] At present, there are two ways to deal with voltage sampling and power balance in existing products on the market: 1. Voltage sampling and power balance are collinear, and the balance current design is small, and the voltage change caused by internal resistance is negligible, resulting in the sampling voltage accuracy reaching Less than the requirements; 2. The balanced current design is relatively large, and the sampling voltage accuracy is up to standard, but two sets of wiring harnesses are required for voltage sampling and power balancing, resulting in increased costs and complicated wiring

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