Lead-acid battery quick charging control method, variable-current control circuit and quick charging device

Abstract

The invention relates to a battery charging control method and a battery charging control device. A lead-acid battery quick charging control method comprises the following steps: at the beginning of charging, a variable-current control circuit is used, and the maximum current of charging is set based on the maximum current acceptable to a battery during charging; when a charger is in a charging state, the battery is charged by means of intermittent charging; and finally, when the terminal voltage of the battery rises to the highest, the charging mode is switched to further charge the battery or maintain the battery. A variable-current control circuit comprises a variable current detection unit, a segmented delay control unit or a linear adjustment unit. A lead-acid battery safe and quick charging device comprises a variable-current control circuit, an intermittent control circuit, a charging control circuit, and a switching power supply, wherein the output of the variable-current control circuit is connected with the switching power supply, the switching power supply is connected with a battery pack through a current regulator circuit, the charging control circuit is connected with the intermittent control circuit, the intermittent control circuit is connected with the switching power supply, and the current regulator circuit is also connected with the intermittent control circuit.

Description

technical field [0001] The invention relates to a storage battery charging control method and device, in particular to a lead-acid storage battery fast charging control method and its realization circuit (device). Background technique [0002] At present, electric vehicles have become the main means of transportation and transportation in people's daily life, and lead-acid batteries have become the main source of power for electric vehicles because of their mature technology and economical benefits. [0003] A lead-acid battery is a secondary battery, which can be replenished by a charger and used repeatedly after its internal storage is exhausted. In order to protect the storage battery from damage due to charging, the current chargers generally have the defects of small charging current and long charging time. The current charging current is generally set to about 0.15C of the battery. Although such a large current does not cause any harm to the battery, it takes 8-10 hou...

AI Technical Summary

Problems solved by technology

3. When the charging current is less than the acceptable current of the battery, the effect is reduced and the full charging time is prolonged. 4. When the charging current is greater than the acceptable current of the battery, the battery terminal voltage rises too fast, and the excess electric energy is converted into heat, which wastes electric energy Also cause damage to the battery, resulting in shortened battery life

5. At the beginning of charging and when it is close to being fully charged, the capacity of the battery to accept current conversion is weak, and excessive charging current will also damage the battery

[0005] At present, the main charging methods have different defects: 1. Three-stage method: the selected charging current is a safe current, but the charging time is too long, and it cannot adapt to the whole process of the battery being charged. The deviation is large, and the trickle charging lasts too long in the later period, which will still cause overcharging. This situation often occurs due to operator reasons.

These new methods can improve the charging performance, but most of them use the measurement and control of the temperature rise parameters of the battery surface, and only intervene after the temperature rises. The measures lag behind, and the charging current cannot be significantly increased to increase the charging speed. Even relying on single-chip microcomputers, programs, etc., the implementation threshold is high or the cost increases

3. There is also the use of new technologies to precisely decompose the charging process and set charging parameters in multiple stages. This method is only aimed at the commonality of the group and cannot be precisely adapted to individuals, nor is it suitable for batteries with different levels of new and old, and different remaining storage capacity

However, the charging current of the chargers sold in the market is fixed, which causes the battery to be damaged by excessive current in the early stage of charging, and the charging time will be prolonged if the battery is not full in the middle stage, and the charging current will be too large in the final stage to generate heat.

This not only prolongs the time to fully charge the battery, but also reduces the charging efficiency, wastes electric energy, and also causes the failure of the battery to be filled and deformed at the end of use, leading to early scrapping

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