The invention provides a pure electric vehicle battery charging protection method and device. The method comprises the following steps that: the internal storage information of a system is emptied when a battery starts to be charged; voltage and current information of any battery cell is collected, and whether the current of the battery cell is stable or not is judged; if the current of the battery cell is stable, a first voltage value of the battery cell is acquired, and a second voltage value of the battery cell is acquired after T seconds; voltage difference value of the battery cell is calculated according to the first voltage value and the second voltage value, and the voltage difference values of all the battery cells in the system in a preset sampling period are recorded; and when the voltage difference value of any battery cell in the preset sampling period is greater than the threshold value, fault latching is carried out, and charging is forbidden. According to the method anddevice, whether a fault occurs or not is judged by judging a voltage drop condition when current is stable, voltage difference abnormity caused by current fluctuation is avoided, and the accuracy ishigh; and the abnormal drop of the voltage of each cell in a charging process is judged, the fault is locked, and therefore, safety is improved.
本发明提供一种纯电动汽车电池充电保护方法及装置,该方法包括以下步骤:当电池开始充电时,清空系统内部存储信息;采集任一电池单体的电压及电流信息,并判断电池单体的电流是否稳定;若电池单体的电流稳定,则采集电池单体的第一电压值,T秒后,采集电池单体的第二电压值;根据第一电压值和第二电压值计算所述电池单体的电压差值,并记录系统内所有的电池单体在预设采样周期内的电压差值;当任一电池单体在预设采样周期内的电压差值大于阈值时,进行故障锁存,禁止充电。该方法通过判断电流稳定时的压降情况来判断是否故障,避免了电流波动导致的压差异常,准确率高;通过判断充电过程中单体电压异常跌落,锁定故障,提升安全性。
Pure electric vehicle battery charging protection method and device
纯电动汽车电池充电保护方法及装置
2020-12-01
Patent
Electronic Resource
Chinese
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES |
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