Inter-module equalization method, device and equipment based on two-way active equalization

Abstract

The embodiment of the present invention provides an equalization method and device among modules based on two-way active equalization, and belongs to the technical field of energy storage battery module equalization. The method includes: obtaining the module voltage of each battery module and the cell voltage of each cell in each battery module; for each battery module, calculating the first module voltage and The first voltage difference between the second module voltages of the battery module with the lowest module voltage; and when the first voltage difference is greater than the first inter-module equalization threshold, the intra-module equalization of the current battery module is turned on until The cell voltage difference between the cells in the current battery module is smaller than the balance threshold in the first module. The present invention realizes the balance between modules by turning on the balance in the battery module with higher voltage, and utilizes the energy loss during the balance in the module to realize the balance between the modules, so as to avoid the problem that the reliability of the battery module is reduced due to the balance circuit and wiring between the modules. question.

Description

technical field [0001] The present invention relates to the technical field of battery module equalization, in particular to a method for balancing between modules based on bidirectional active balancing, a device for balancing between modules based on bidirectional active balancing, and a method for balancing between modules based on bidirectional active balancing device and a computer-readable storage medium. Background technique [0002] The power of electric vehicles comes from batteries. Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, no pollution, light weight, and small self-discharge. They have great market application potential in the transportation field. Due to the production process and Due to individual differences in materials, each cell of the lithium battery produced shows inconsistency, mainly in: capacity, internal resistance, self-discharge rate, voltage, state of charge SOC, etc. After the cells are...

AI Technical Summary

Problems solved by technology

In the process of charging and discharging, due to the differences between modules and the energy consumption of active equalization efficiency, inconsistencies between modules are also prone to occur, and equalization is needed to reduce the differences between modules and improve the performance of the battery pack. However, if an active equalization scheme is added between the modules, the equalization hardware circuit and wiring harness scheme are complicated, and there are risks in the high voltage of the modules, which will make it difficult to achieve equalization between modules.

Images