1 .When the timing control adopts the constant current charging method, the charging time of the battery can be easily determined according to the battery capacity and the charging current. Therefore, as long as the charging time is preset, once the time is up, the timer can send a signal to stop charging or It becomes trickle charge. This method is simple, but the charging time cannot be automatically adjusted according to the state of the battery charging surface, so the actual charging time. There may be cases of undercharging and sometimes overcharging.
2 .When the battery temperature is controlled for normal charging, the temperature change of the battery is not obvious, but when the battery is overcharged, the internal gas pressure will increase rapidly, the oxidation reaction on the negative plate will cause internal heat, and the temperature will rise rapidly (every minute can be raised) A few degrees Celsius). Therefore, by observing the change in the battery temperature, it can be judged whether the battery is full. The two thermistors are usually used to monitor the battery temperature and the ambient temperature respectively. When the temperature difference between the two reaches a certain value, the stop signal is issued. Since the dynamic response speed of the thermistor is slow, the full charge state of the battery cannot be accurately and timely detected, which is not conducive to the maintenance of the battery life.
3 .Battery terminal voltage negative increment control When the battery is fully charged, its terminal voltage will show a downward trend. According to this, the time when the battery voltage has a negative growth can be used as the stop time. This method is faster than the temperature control method. In addition, the negative increase in voltage is independent of the absolute value of the voltage. Therefore, this stop-and-charge control method can accommodate battery pack charging with a different number of cells. The disadvantage of this method is that the sensitivity and reliability of the general detector are not high. At the same time, when the ambient temperature is high, the reduction after the sufficient voltage of the battery is not obvious, and thus it is difficult to control.
4 .Using polarization voltage control Under normal circumstances, the polarization voltage of the battery is generally protected at 50-100mV after the battery is fully charged. The polarization voltage of each single cell is measured, so that each battery can be charged to its own requirements. Degree. Since there are at least some slight differences in the geometry, chemistry and electrical properties of each battery, then the characteristics of each cell should be determined to determine the level of charge it requires, rather than taking the battery as a whole. The method of control is more appropriate.
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