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The Kn-n-1 and j values of a certain monomer are abnormal and repeated the most frequently as abnormal values, which may be due to the high DC internal resistance of the monomer. Screening the monomer based on DC internal resistance does not affect the diagnostic results and can improve the accuracy of the diagnostic results.

Application of Micro Short Circuit Diagnosis Method for 2 Lithium Batteries

2.1 Test object and steps

The test object is the WXL12S537300A lithium battery module produced by Cascade Universal A123 Co., Ltd. This Cascade uses a lithium iron phosphate battery pack consisting of 13 modules in series, each module consisting of 6 soft pack monomers in parallel, with a rated capacity of 50A · h and a rated voltage of 3.3V.

During the testing, the arbinevts 600V/300A high-power lithium battery testing equipment and the TU410-5 temperature control box from Harding Technology (Chongqing) Testing Equipment Co., Ltd. were selected. The whole test process is carried out in the 45 ℃ environment of the temperature control box, and the battery pack is allowed to stand for 5min. The current of 300A is used to discharge the battery pack until any module reaches the cut-off voltage of 2.7V, and then the current of 300A is used to charge the battery pack until any module reaches the cut-off voltage of 3.6V, so as to charge and discharge the battery pack. Three tests were conducted using the same charging and discharging cycle test steps, and the battery pack remained at a constant temperature of 45 ℃ during the two adjacent tests.

2.2 Selection of Test Data

Select the charging data from all test data and calculate the relative charging time of each module of the battery pack Δ When Tj is used, considering the consistency of the difference between the two adjacent charging capacities and the voltage of each module at the end of charging, all charging data should be screened to ensure the accuracy of micro short circuit diagnosis without affecting the results. The data selection principles are as follows:

(1) Calculate the difference between each charging capacity of the battery pack and the subsequent charging capacity Δ Compare C with each other and select the corresponding charging data with a smaller value of △ C. Since the capacity of adjacent two charges remains basically unchanged during normal charging and discharging cycles, this selection can prevent the relative charging time of the module from being affected during each charging cycle Δ Tj fluctuates significantly;

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