Battery low-temperature lossless alternating current self-heating parameter selection method and device

Abstract

The invention discloses a parameter selection method and device for low-temperature lossless alternating-current self-heating of a battery, and the method comprises the steps: calibrating the characteristic frequencies of the battery at different temperatures as the frequency of alternating-current self-heating based on the principle that the alternating-current impedance of the battery at the characteristic frequencies is irrelevant to the state of charge of the battery; and then the optimal excitation amplitude of battery alternating current self-heating is obtained through real-time control. The method is applied to the field of batteries, the low-temperature lossless alternating-current self-heating parameters of the batteries are selected through the method, the batteries can be rapidly and efficiently heated, the health state of the batteries cannot be greatly damaged, and the method has important significance on lossless, rapid and efficient self-heating of the batteries. Compared with other alternating current self-heating parameter selection methods, the method has the advantages of being easy to use and wide in application range.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a parameter selection method and device for low-temperature non-destructive AC self-heating of batteries. Background technique [0002] In a low-temperature environment, the charging and discharging ability of lithium-ion batteries is poor, and there will be situations where it cannot be charged or discharged. In addition, lithium-ion batteries are charged in a low-temperature environment, and the negative electrode is prone to lithium precipitation and aging, which will lead to the rapid loss of active lithium ions inside the battery and the growth of lithium dendrites, thereby rapidly reducing the battery capacity and increasing the risk of internal short circuit and thermal runaway of the battery . In order to improve the performance of lithium-ion batteries in low-temperature environments, using heating methods to increase the actual operating temperature of the b...

AI Technical Summary

Problems solved by technology

However, if the AC self-heating method is used improperly, it will bring great damage to the health of the battery and seriously affect the actual service life and safety of the battery.

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