One of the most widely circulated in the industry is that the battery is not worn out, it is burnt. In order to meet the short-time high-capacity charging of the electric bicycle battery, in the three-stage constant voltage current limiting charging, it is necessary to increase the constant voltage value to 2.47V to 2.49V. Thus, the oxygen evolution voltage of the positive electrode plate of the battery and the hydrogen evolution voltage of the negative electrode plate are greatly exceeded. In order to reduce the charging time, some charger manufacturers' products have increased the current of the constant voltage to float charging, so that after the charging indication is fully charged, it is not fully charged, and it is compensated by raising the floating charging voltage. Thus, the float voltage of many chargers exceeds the single cell voltage of 2.35V, so that a large amount of oxygen is still being evolved during the floating charge phase.
The oxygen circulation of the battery is not good, so that it is continuously exhausted during the floating charge phase. The constant voltage value is high, which guarantees the charging time, but the sacrifice is water loss and vulcanization. The constant voltage value is low, and the charging time and charging power are difficult to guarantee. On the basis of improving the battery grid alloy of the battery, improving the gassing potential, improving the oxygen cycle performance, and improving the efficiency of the sealing reaction, the maximum charging voltage for controlling charging is below 2.42V, that is, below the hydrogen evolution potential. This will inevitably lead to an increase in charging time. This requires the addition of a depolarized negative pulse in the state of high current charging (current limiting charging) to improve the charging acceptance of the battery and to charge more when charging at a high current. Some power, shorten the charging time. 70% of the 2C current is charged, when the battery is relatively large in charging capacity, the battery is charged with a large current, and the damage to the battery is relatively small. The battery is basically no higher than the severe hydrogen evolution voltage.
Once above the hydrogen evolution voltage, the battery will quickly lose water. To use such a charger, continuous charging and discharging must be used. If the charging is stopped for a few days, the battery will be severely vulcanized and will fail prematurely. When the user uses the battery, it is impossible to guarantee that it can be charged in time after each use. If the battery is not charged in time within a year, the vulcanization of the battery will accumulate. Most charger manufacturers say that the car manufacturer does not accept chargers that guarantee battery life due to price factors. It should be acknowledged that this is the case for most small businesses. However, large, large-scale enterprises that develop and do have high prices and cannot buy good chargers. Some charger manufacturers exaggerate certain features, and the efficacy of the finished product is not as good as its promotion. There are still a lot of functions that belong to the function of selling concepts, and the effect is limited.
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