Calculation method and device for expansion force of battery module and control equipment

Abstract

The invention provides a calculation method and device for expansion force of a battery module and control equipment. The calculation method comprises the following steps: acquiring the expansion force of a single battery cell in the tested battery module during cyclic charging and discharging at a preset temperature; establishing a mathematical model between the number of charge-discharge cycles of the battery cell and the expansive force according to the expansive force; calculating an equivalent thermal expansion coefficient of the battery cell according to the mathematical model and the battery cell parameters of the battery cell; and utilizing the modeling model of the tested battery module to obtain the battery module expansive force of the tested battery module through simulation calculation according to the cell parameters and the equivalent thermal expansion coefficient. According to the scheme, the expansibility of the battery module under the N times of charge-discharge cycles can be calculated only by performing expansibility data testing on a single battery cell after the charge-discharge cycles for a small number of times, so that the number of the battery cells can be reduced, the testing cost can be reduced, and the testing period can be shortened. According to the scheme, the calculation of the expansion force of the battery module of the battery module with different series-parallel connection arrangement modes of the same type of battery cells can be met.

Description

technical field [0001] The invention relates to the battery field, in particular to a calculation method, device and control equipment for the expansion force of a battery module. Background technique [0002] Usually, the thickness of the battery cell will change during the charging and discharging process. As the number of charge and discharge increases, the thickness will gradually increase, and the expansion will not be completely pressed back when pressed, and the cell will bulge. [0003] If the battery module is not designed properly, the expansion force generated by the battery module during long-term use will damage the end plate of the module, destroy the structure of the module, and cause a safety risk. Therefore, the calculation of the expansion force needs to be considered in the design and development of the module. The expansion force test of the traditional battery module can only be tested with testing equipment after the module is processed, which often re...

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Problems solved by technology

[0004] The embodiment of the present invention provides a calculation method, device and control equipment for the expansion force of

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