Intelligent charging system of lead acid batteries and charging method

Abstract

The invention discloses an intelligent charging system of lead acid batteries and a charging method. The charging system disclosed by the invention comprises a controller and a main circuit, wherein the batteries with partial damage are maintained and precharged through the controller according to the collected terminal voltage and resistance of the lead acid batteries; then, the lead acid batteries are charged by adopting a variable constant current mode and balanced; when the voltage of the lead acid batteries approaches the upper limit charging voltage, the charging is finished and changedinto constant-voltage charging; the trickle charging is carried out according to the capacity parameters of the lead acid batteries; and finally, a charging power supply is automatically cut off. Theintelligent charging system and charging method disclosed by the invention can effectively solve the problem that bus bars and slab lattices are corroded, avoid accidents because of a temperature from occurring, can effectively protect the capacity of a battery pack and reach the purpose of saving energy.

Description

technical field [0001] The invention relates to a fast charging method and a charging system for a lead-acid battery. It belongs to the field of lead-acid batteries. Background technique [0002] Lead-acid battery is a kind of chemical power source, and it is the first choice for low-cost power source. Its raw materials are easy to obtain, reliable in use, suitable for large current discharge and wide application environment temperature. Commonly used lead-acid batteries include valve-regulated sealed lead-acid batteries. Due to the "maintenance-free" nature of valve-regulated lead-acid batteries, some users have misunderstood that this kind of battery does not need maintenance at all, even after the battery is installed. No longer maintained and managed. In fact, the "maintenance-free" valve-regulated lead-acid battery only avoids the damage to equipment and personnel caused by the volatilized acid gas of the open-type battery. However, long-term experiments have fou...

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Problems solved by technology

However, long-term experiments have found that valve-regulated sealed lead-acid batteries have many potential safety hazards in use, namely:

[0003] 1. Due to the excessive charging current, the busbar and the grid are corroded, resulting in the narrowing of the metal path and increasing the internal resistance of the battery

[0004] 2. Due to the high floating charge voltage, the corrosion rate of the positive grid and the discharge of gas in the battery are accelerated, resulting in drying up

[0005] 3. Due to the influence of high ambient temperature, the internal temperature of the battery rises, resulting in an increase in the float charge current, which in turn accelerates the rise in the internal temperature of the battery, forming a vicious cycle and causing thermal runaway

[0006] 4. Due to the limitation of the voltage and current of the single battery, the lead-acid battery energy storage system is generally used after connecting multiple batteries in parallel and then in series to form a high-voltage and high-capacity battery. Even if it is screened before the composition, the battery consistency is good. Differences can also appear after a period of use

After several vicious cycles of "float charge → discharge → equal charge → discharge → float charge", the capacity of the entire battery pack continues to decline

[0007] 5. The traditional method is to use the floating charge method to collect the battery terminal voltage, but the measurement of the battery terminal voltage in the floating charge state cannot truly reflect the performance of the battery. terminal voltage; and once the power supply system fails and the battery discharges, it may not be able to guarantee the discharge requirements under the accident state, thereby expanding the scope of the accident. Therefore, online monitoring of battery charge and discharge is required

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