Heating circuit of battery pack, power supply system and electric vehicle

Abstract

The invention discloses a heating circuit of a battery pack, a power supply system and an electric vehicle. The heating circuit comprises a battery pack, a first switch, a second switch, a first diode, a second diode, an inductor and a capacitor, wherein the first end of the first switch is connected with the anode of the battery pack; the first end of the second switch is connected with the second end of the first switch, and the second end is connected with the cathode of the battery pack; the cathode of the first diode is connected with the anode of the battery pack, and the anode is connected with the second end of the first switch; the anode of the second diode is connected with the cathode of the battery pack, and the cathode is connected with the second end of the first switch; thefirst end of the inductor is connected with the second end of the first switch; the first end of the capacitor is connected with the second end of the inductor, and the second end is connected with the cathode of the battery pack. According to the heating circuit, charging and discharging currents during charging and discharging of the battery pack can be utilized to flow through the internal resistance of the battery to generate heat to directly heat the battery cell, the heating efficiency is high, the space volume is not occupied, complex control circuits and execution elements are not needed, the integration degree is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a heating circuit of a battery pack, a power supply system and an electric vehicle. Background technique [0002] The working performance of the battery pack is greatly affected by the environment, such as temperature, too high or too low temperature will affect the charge and discharge rate of the battery pack, the most serious performance, BMS (Battery Management System, battery management system) will prohibit the battery pack Charging and discharging, causing the battery pack to stop working. Therefore, it is necessary to adjust the temperature of the battery pack, for example, to heat the battery pack when the temperature of the battery pack is low, so as to increase the temperature of the modules and cells inside the battery pack, thereby improving the charging and discharging efficiency of the battery pack. [0003] In related technologies, the heating methods of the ...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned heating methods, whether it is heating film, PTC or liquid cooling, are all indirect heating methods. The heat of external heating needs to be conducted to reach the battery cell. For example, the heating film and PTC need to pass through the module and then heat the battery cell. , and liquid cooling needs to heat the liquid through the heater, and then flow the heat through the liquid to transfer the heat to the module, the heating rate is slow and the efficiency is low

Moreover, additional heating devices need to be installed, which takes up a lot of space, and complex control circuits and actuators need to be configured, the degree of integration is reduced, and the cost is high

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