A method for determining a real-time discharge current allowable value of a power battery comprises the following steps: S1, after a battery management system is powered on, the discharge current allowable value is a 30s peak current; s2, when the actual current of the vehicle is larger than the current allowable continuous discharge current value of the power battery and lasts for 30 s, the discharge current allowable value is reduced according to the change rate of 30 A/s until the change rate is reduced to the continuous discharge current value under the current temperature of the battery core and the current charge state; if the variable quantity of the discharge current allowable value is lower than 5A, jumping is directly carried out; s3, when the vehicle speed is reduced, the actual current of the whole vehicle is smaller than 0.7 time of the current allowable continuous discharge current value of the power battery, and the continuous discharge current value lasts for 2 s, the discharge current allowable value directly jumps from the continuous discharge current value to 30 s peak current; and S4, the steps S2 and S3 are circulated until the battery management system BMS is powered off. According to the design, the over-current problem of battery discharge is solved, and the control strategy is simple.
一种确定动力电池实时放电电流允许值的方法,包括以下步骤:S1、电池管理系统BMS上电后,放电电流允许值为30s峰值电流;S2、当车辆实际电流大于动力电池当前允许的持续放电电流值,且持续30s时,放电电流允许值按照30A/s的变化速率降低,直至降到当前电芯温度和当前荷电状态下的持续放电电流值;若放电电流允许值的变化量低于5A,则直接跳变;S3、当车速下降,整车实际电流小于0.7倍动力电池当前允许的持续放电电流值,且持续2s时,放电电流允许值由持续放电电流值直接跳变到30s峰值电流;S4、循环步骤S2和S3,直至电池管理系统BMS下电。本设计不仅解决了电池放电过流问题,而且控制策略简单。
Method for determining real-time discharge current allowable value of power battery
一种确定动力电池实时放电电流允许值的方法
2021-11-19
Patent
Electronic Resource
Chinese
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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