Battery heating system and control method thereof, vehicle

By controlling the pulse heating mode of the power battery and adjusting the inverter duty cycle according to the charging pile status in new energy vehicles, a pulse charging and discharging circuit is formed, which solves the problem of difficult charging of power batteries at low temperatures and realizes rapid heating and charging.

CN121799253BActive Publication Date: 2026-07-21WEICHAI POWER CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WEICHAI POWER CO LTD
Filing Date
2026-03-12
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

New energy vehicles face difficulties in charging their power batteries, experience low discharge efficiency, and suffer from reduced cycle life at low temperatures. Existing technologies also exhibit low heating efficiency in power batteries, which negatively impacts charging performance.

Method used

By controlling the pulse heating mode of the power battery according to the connection status of the charging pile and adjusting the duty cycle of each phase bridge arm in the inverter, a pulse charging and discharging circuit is formed, and heating is carried out by using the frequency and amplitude of the pulse current.

Benefits of technology

The heating rate of the power battery has been improved, the charging time has been shortened, and charging has been achieved under low temperature conditions, thereby enhancing the performance of the power battery.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a battery heating system and a control method thereof and a vehicle, relates to the technical field of vehicle control, and the method comprises the following steps: when the power battery has a pulse heating requirement, determining a pulse heating mode of the battery heating system according to the connection state of the charging pile; controlling the conduction state of the first switching module, the second switching module and the third switching module, so that the power battery, the energy storage capacitor, the inverter, the motor and the charging pile are sequentially connected to form a pulse charging and discharging loop of the power battery corresponding to the pulse heating mode; controlling the duty cycle of the control pulse of each phase bridge arm in the inverter according to a preset pulse current frequency and a pulse current amplitude and the pulse heating mode, and controlling the pulse charging and discharging loop to perform pulse heating on the power battery according to the duty cycle, so that the power battery heating rate can be improved, the charging time can be shortened, and charging can be realized at low temperature.
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