Title:
ENERGY STORAGE SYSTEM AND SOC CORRECTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/082604
Kind Code:
A1
Abstract:
Provided in the present application are an energy storage system and an SOC correction method therefor. The SOC correction method comprises: determining whether an energy storage system is in a double-voltage plateau interval of a lithium manganese iron phosphate battery cell; and when the energy storage system is in the double-voltage plateau interval, correcting an SOC of the lithium manganese iron phosphate battery cell according to the SOC of the lithium manganese iron phosphate battery cell. Therefore, by using the double-voltage plateau characteristic of a lithium manganese iron phosphate battery cell, each time the lithium manganese iron phosphate battery cell is charged and discharged, an SOC correction point located within a middle section of a plateau of the lithium manganese iron phosphate battery cell can be provided therefor, thereby avoiding a long-term accumulative deviation and improving the accuracy of SOC estimation. Moreover, by using the high-voltage plateau feature of lithium manganese iron phosphate, a PCS direct-current access voltage can be better adapted to, the voltage utilization rate is improved, and an energy storage system still maintains an active grid connection under high voltage ride through of a power grid. In addition, the wide-temperature operation performance of an energy storage battery system can also be improved by using the good low-temperature characteristic of lithium manganese iron phosphate.
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Inventors:
ZHOU JIANJIE (CN)
CHEN FANGLIN (CN)
CAO XIAOHUI (CN)
CAI ZHUANG (CN)
CHEN FANGLIN (CN)
CAO XIAOHUI (CN)
CAI ZHUANG (CN)
Application Number:
PCT/CN2023/091628
Publication Date:
April 25, 2024
Filing Date:
April 28, 2023
Export Citation:
Assignee:
SUNGROW POWER SUPPLY CO LTD (CN)
International Classes:
G01R31/396; G01R31/3835
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)
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