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How to reduce energy consumption of batteries during EV heating?

Fig. 21. (a) Photograph of the battery pack and heater, and (b) photograph of the battery box inside the thermostatic enclosure . To reduce the energy consumption of batteries during the heating process of EVs, researchers have proposed burner heating methods that utilize alternative energy sources.

Can a battery heat up quickly?

For battery modules with relatively high demand for low-temperature heating, a single battery heating method can no longer meet the demand. Therefore, in recent years, most people have begun to study hybrid heating methods so that a battery can warm up rapidly while also improving temperature uniformity and safety.

How does temperature affect battery heat balance performance?

The inlet temperature, heating time, and external ambient temperature of the battery heating system all have an effect on the heat balance performance. The temperature uniformity is poor due to the narrow space, and the temperature of the water heating the battery is also decreased with the increase of the distance the water flows through .

How does a battery heating system work?

The operating process involves the liquid (e.g., silicone oil) heated by the heater flows between the cells by employing the pump, facilitating the transfer of heat from the liquid to the battery. The inlet temperature, heating time, and external ambient temperature of the battery heating system all have an effect on the heat balance performance.

What happens if a battery reaches a low temperature?

Under extremely low temperature conditions (below −20°C), due to the increase in the viscosity of the electrolyte, the diffusion rate of Li-ions in the electrolyte was severely reduced and the internal resistance of the battery increased sharply, which inevitably led to a substantial decrease in the power supply/absorption capacity .

Can a battery module be preheated at low temperatures?

He et al. proposed a hybrid heating strategy (Fig. 42). This strategy could not only balance the temperature between different batteries in the module but could also ensure that the battery module was preheated at low temperatures. The experimental results are shown in Fig. 43.

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