Method for determining the aging state of battery cells by means of impedance spectroscopy
A battery cell and aging state technology, applied in the direction of material impedance, electrical components, secondary batteries, etc., can solve the problems of insufficient battery cells, unreliable prediction of battery cell service life, insufficient estimation of battery cell aging state, etc. Achieve the effect of saving test time
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[0045] According to the invention, the determination of the aging state and the prediction of the service life are carried out by means of impedance spectroscopy. It has been shown here that the aging of a battery cell can be detected mainly by two signs, which are illustrated here by way of example with a lithium-ion battery in our measurement sequence.
[0046] 1) Increased impedance in the low frequency range
[0047] The increasing state of aging of these cells is manifested by an impedance increase mainly in the low frequency range (see FIG. 2 ). The increase in impedance is basically independent of the aging duration, but depends on all relevant factors contributing to aging, such as SOC (state of charge: state of charge) and temperature. Thus, the impedance increase can be used for aging state identification and especially for service life prediction.
[0048] 2) Formation of the second RC network in impedance spectroscopy
[0049] In addition to the impedance increa...
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