A method and system for controlling self-heating of a power battery pack based on a drive system

By establishing a self-heating closed-loop circuit in the drive system of electric vehicles, the problem of degradation in the performance of the power battery pack in low temperature environments is solved, and the rapid and uniform heating of the internal battery cell is achieved, thereby improving the battery performance and service life.

CN114643905BActive Publication Date: 2025-03-25HUNAN CSR TIMES ELECTRIC VEHICLE
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Patent Information

Application Number
CN202011520776.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-12-21
Publication Date
2025-03-25
Estimated Expiration
2040-12-21

AI Technical Summary

Technical Problem

The performance of the power battery pack is degraded in low temperature environments, the existing heating methods are inefficient and cost-effective, and the internal temperature of the battery cannot be guaranteed to be stable, which affects the service life.

Method used

By establishing a self-heating closed-loop circuit in the drive system of an electric vehicle, a given self-heating current is calculated using a permanent magnet synchronous motor and a motor controller, and the internal battery cell of the power battery pack is controlled to heat up until the set temperature threshold is reached.

Benefits of technology

It realizes rapid and even heating of the internal battery cells of the power battery pack, improves battery performance in low-temperature environments, extends service life, and reduces damage to the drive system.

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Abstract

The present invention provides a method and system for controlling the self-heating of a power battery pack based on a drive system, the method comprising a heating demand confirmation step, after determining that the drive system of the vehicle is normal, obtaining the temperature of each cell of the power battery pack, and starting self-heating if there is a cell in the power battery pack whose temperature is lower than a set first temperature threshold; in the self-heating control step, after receiving a heating start instruction from a battery management system, calculating a given self-heating current, and then performing closed-loop control on the drive system according to a set strategy based on the calculated given self-heating current, so that the internal cells of the power battery pack are heated until the set heating requirements are met. The scheme of the present invention can overcome the defects of slow heating speed, complex heating structure and large space occupancy of traditional technologies, and on the basis of realizing efficient and adjustable heating, the motor of the vehicle basically does not generate electromagnetic torque, and the damage to the battery and the drive system is controlled to a minimum.
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