The invention discloses an electric quantity dynamic evaluation method of a storage battery, a battery management system and an electric vehicle. The method comprises the following steps: S01, obtaining an initial electric quantity value Qc0, a weight value K and a charge and discharge characteristic curve of a current period according to a battery state of the storage battery; s02, calculating an electric quantity change value of the storage battery in the current period by adopting a coulombmeter method, correcting the electric quantity change value according to the weight value K, and adding or subtracting the corrected electric quantity change value and an initial electric quantity value Qc0 to obtain a pre-corrected first electric quantity value Qc1 of the storage battery; and S03, when the current voltage value of the storage battery reaches the open-circuit voltage value Vi corresponding to the ith correction point, re-correcting the first electric quantity value Qc1 according to the electric quantity value Qi corresponding to the correction point to obtain a second electric quantity value Qc2, and calculating the battery electric quantity percentage of the storage battery in the current period according to the re-corrected second electric quantity value Qc2. The marking accuracy of the electric quantity of the battery can be improved.
本发明公开了一种蓄电池的电量动态评估方法、电池管理系统和电动车,方法包括:S01,根据蓄电池的电池状态得到当前周期的初始电量值Qc0、权重值K以及充放电特性曲线;S02,采用库仑计法计算该蓄电池在当前周期内的电量变化值,根据所述权重值K对所述电量变化值进行修正,并将修正后的电量变化值与初始电量值Qc0相加或相减以获取该蓄电池预修正的第一电量值Qc1;S03,在所述蓄电池的当前电压值达到第i个校正点所对应的开路电压值Vi时,依据该校正点所对应的电量值Qi对所述第一电量值Qc1进行再修正以获得第二电量值Qc2,并依据再修正后的第二电量值Qc2计算该蓄电池在当前周期的电池电量百分比。本发明可以提高电池电量的标示准确度。
Dynamic estimation method for electric quantity of storage battery, battery management system and electric vehicle
蓄电池的电量动态估算方法、电池管理系统及电动车
2023-06-06
Patent
Electronic Resource
Chinese
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