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SOC equalization system between retired power battery modules and control method thereof

A power battery and equalization system technology, applied in the direction of charge equalization circuit, arrangement of multiple synchronous batteries, battery circuit device, etc. SOC balance and other issues, to achieve the balance of SOC among decommissioned power battery modules, avoid energy transfer, and ensure the effect of stable regulation

Active Publication Date: 2019-02-22
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0004] In a distributed cascaded energy storage system composed of decommissioned power battery modules, due to the difficulty of screening, it is difficult to ensure that the decommissioned power batteries screened are as highly consistent as new batteries
In the traditional SOC balance control scheme, only

Method used

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  • SOC equalization system between retired power battery modules and control method thereof
  • SOC equalization system between retired power battery modules and control method thereof
  • SOC equalization system between retired power battery modules and control method thereof

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Embodiment Construction

[0044] In order to make the purpose and technical solution of the present invention clearer, the SOC balance control system and control method of the decommissioned power battery of the present invention will be described in detail below in conjunction with the accompanying drawings:

[0045] like figure 1 As shown, it is a schematic diagram of the SOC equalization system among decommissioned power battery modules of the present invention. The decommissioned power battery is divided into N modules. Each decommissioned power battery module is connected in series with a fault switch and connected in parallel with a bidirectional DC-DC converter to form a standard boost topology energy storage module. Each bidirectional The DC-DC converter consists of 2 MOSFET switches. The output terminals of the N energy storage modules are connected in series to provide higher output voltage and output power for the DC bus and load terminals.

[0046] The control terminal of the external sam...

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Abstract

The invention discloses a SOC equalization system between retired power battery modules and a control method thereof. A distributed energy storage structure is adopted, and according to weight distribution factors calculated by parameters such as a voltage and capacity of a retired power battery and SOC equalization, distribution is performed on an output voltage of an energy storage module to achieve the SOC equalization between the retired power battery modules. Based on a SOC equalization control system of the retired power battery of the invention, an additional equalization circuit is notrequired, energy transfer between the retired power battery modules is avoided; and a double closed-loop control method that combines the SOC equalization of output voltage distribution rules of weight factors and load voltage regulation is adopted, and so, while stable adjustment of a load voltage of an energy storage system is ensured, equalization of a SOC between the retired power battery modules is achieved, and the stability of system operation is ensured.

Description

technical field [0001] The invention belongs to the field of battery energy storage, and specifically designs an SOC equalization system among decommissioned power battery modules and a control method thereof. Background technique [0002] With the increasing number of new energy vehicles in the domestic market, vehicle power batteries will usher in a continuous growth peak in the next few years. The remaining capacity of most decommissioned power batteries for vehicles can still reach 80% of the original capacity. Through cascade energy storage utilization, decommissioned power batteries for vehicles can still be applied to energy storage systems that have lower battery performance requirements, reducing It reduces the life cycle cost of the battery, improves the utilization rate of battery materials, and reduces environmental pollution, which is of great significance for promoting the optimization and upgrading of the new energy vehicle industry. [0003] In the distribut...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 续丹毛景禄王斌赵根周佳辉郑惠文
Owner XI AN JIAOTONG UNIV
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