Abstract
It is difficult to predict the heating time and power consumption associated with the self-heating process of lithium-ion batteries at low temperatures. A temperature-rise model considering the dynamic changes in battery temperature and state of charge is thus proposed. When this model is combined with the ampere-hour integral method, the quantitative relationship among the discharge rate, heating time, and power consumption, during the constant-current discharge process in an internally self-heating battery, is realized. Results show that the temperature-rise model can accurately reflect actual changes in battery temperature. The results indicate that the discharge rate and the heating time present an exponential decreasing trend that is similar to the discharge rate and the power consumption. When a 2 C discharge rate is selected, the battery temperature can rise from −10 °C to 5 °C in 280 s. In this scenario, power consumption of the heating process does not exceed 15% of the rated capacity. As the discharge rate gradually reduced, the heating time and power consumption of the heating process increase slowly. When the discharge rate is 1 C, the heating time is more than 1080 s and the power consumption approaches 30% of the rated capacity. The effect of discharge rate on the heating time and power consumption during the heating process is significantly enhanced when it is less than 1 C.
Highlights
Lithium batteries have become the main source of power for electric vehicles because of the advantages they offer, such as reduced pollution, a long life cycle, high energy density, and good power performance [1]
A temperature-rise model considering the dynamic fluctuation in battery temperature and state of charge (SOC)
IsAproposed, and it is possible to predict thethe battery temperature duringinthe progress of battery and temperature-rise model considering dynamic fluctuation battery temperature self-heating at low temperature
Summary
Lithium batteries have become the main source of power for electric vehicles because of the advantages they offer, such as reduced pollution, a long life cycle, high energy density, and good power performance [1]. The lithium metal precipitates on the graphite anode surface at low temperatures or during charging at a high rate, and further reacts with the electrolyte As a result, both available electrolyte and lithium ions are lost, and the battery volume changes, leading to poor contact between active substances and the current collector [17]. On the basis of the foregoing, this study develops a method to internally preheat lithium-ion batteries at low platform temperatures bydrops, way discharging of constant-current discharging.conditions. It is difficult to predict thethe heating time andintegral power method, the associated quantitative relationship among the discharge rate,batteries heatingattime, and power consumption with the self-heating process of lithium-ion low temperatures. Method, the at quantitative relationship among the discharge rate, heating time, and power consumption, during the progress of constant-current discharging for internally self-heating battery, is realized.
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