Battery module equalization control method and device

Abstract

The invention relates to a battery module balance control device and method. The device comprises: a battery module, a data acquisition module, a SOC estimation module, a fuzzy controller and an equalization circuit module, wherein the battery module is connected with the data acquisition module, the data acquisition module is connected with the SOC estimation module and the fuzzy controller, theSOC estimation module is connected with the fuzzy controller, the fuzzy controller is connected with the equalization circuit module, and the equalization circuit module is connected to the battery module. According to the method and the device, the battery real state judgment accuracy can be improved, the equalization current can be increased, the equalization time can be shortened, the control cost is low, equalization can be realized under the condition that the hardware structure of the current battery management system is not changed, the fault tolerance is high, and the occurrence of anover-equalization problem can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery management, in particular to a battery module balance control method and device. Background technique [0002] Due to the advantages of high energy density, low self-discharge rate, and low environmental pollution, lithium-ion batteries are increasingly used in electric vehicles. However, due to the chemical characteristics of lithium-ion batteries, the capacity and voltage of single cells are limited to a certain extent. Therefore, in the actual use process, in the same electric vehicle, it is necessary to connect many lithium-ion batteries in series and parallel to form a battery pack. The car provides electricity. However, the battery manufacturing process is complicated, and even if the batteries are produced in the same batch, it is impossible to guarantee that the parameters such as internal resistance, capacity, and decay speed of all batteries are exactly the same. The s...

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Problems solved by technology

[0004] Aiming at the problems in the prior art that the equalization control is not accurate enough and does not take into account the influence of temperature on the working state of the battery pack, the present invention provides a battery pack equalization device and method, which can obtain lithium-ion battery current, voltage and temperature information in real time, Taking the SOC value of the single cell and the temperature of the battery module as the basis for equalization, the fuzzy control method is used to equalize the battery pack to achieve the purpose of rapid equalization under controllable temperature

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