Real-time detection of lithium precipitation during battery charging
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The real-time detection of lithium precipitation is significant to avoid internal short circuit and even thermal runaway. Distinguished from the sophisticated, long-duration testing in the lab, the paper introduces an innovative method fordetecting lithium precipitation in the application scenarios of the battery charging process. First, the Warburg impedanceis extended to conical symmetry and the lithium-ions diffusion model for lithium precipitation is presented. Second, tomeasure the parameters inside the battery at the microscopic scales by the external variable, porous electrode model forlithium precipitation is created. Third, lithium precipitation detection technique easily integrated in the charging device ispresented. The result indicates that the ripple current is high when the SOH of the normal battery is up to 93.2%, but theripple current goes down when the SOH is 27.4% due to lithium precipitation. Compared with the impedance of normalbatteries around the cluster centre in the low-frequency range of 0.5~3 Hz, the battery impedance with lithium precipitationis Scattered and uncertain.
Abstract
The real-time detection of lithium precipitation is significant to avoid internal short circuit and even thermal runaway. Distinguished from the sophisticated, long-duration testing in the lab, the paper introduces an innovative method fordetecting lithium precipitation in the application scenarios of the battery charging process. First, the Warburg impedanceis extended to conical symmetry and the lithium-ions diffusion model for lithium precipitation is presented. Second, tomeasure the parameters inside the battery at the microscopic scales by the external variable, porous electrode model forlithium precipitation is created. Third, lithium precipitation detection technique easily integrated in the charging device ispresented. The result indicates that the ripple current is high when the SOH of the normal battery is up to 93.2%, but theripple current goes down when the SOH is 27.4% due to lithium precipitation. Compared with the impedance of normalbatteries around the cluster centre in the low-frequency range of 0.5~3 Hz, the battery impedance with lithium precipitationis Scattered and uncertain.
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