Battery charging and discharging management system

Abstract

The invention discloses a battery charging and discharging management system and belongs to the technical field of storage battery charging and discharging. The battery charging and discharging management system comprises a plurality of batteries inside a battery pack and is characterized by comprising a power supply module, a battery pack parameter collection module and a battery pack single balancing module; the power supply module which is connected with the battery pack parameter collection module and provides power for the battery pack parameter collection module; the battery pack single balancing module is simultaneously connected with the batteries inside the battery pack; the battery pack parameter collection module is connected with the battery pack single balancing module. According to the battery charging and discharging management system, parameters of the battery pack can be collected in real time, balanced charging and discharging of the single battery inside the battery pack is achieved, and the service life of the batteries is effectively prolonged, deep discharging, over discharge of the single batteries, high temperature during the charging process and unbalanced charging are avoided, working states of the batteries can be interrupted in time during abnormal accidents, and personal safety can be guaranteed.

Description

technical field [0001] A battery charging and discharging management system belongs to the technical field of battery charging and discharging. Background technique [0002] At present, the main factors affecting the promotion and application of electric vehicles include the safety of power batteries and the cost of use. Prolonging the service life of batteries is one of the effective ways to reduce the cost of use. At present, the power batteries used in electric vehicles mainly include lead-acid batteries, nickel-metal hydride batteries, and lithium polymer batteries. Among them, lead-acid batteries have matured technology after more than 100 years of development, and their cost is lower than that of nickel-metal hydride batteries and lithium polymer batteries. It is much lower, and new technologies in battery structure continue to improve the performance of lead-acid batteries, so lead-acid batteries will still be widely used in a certain period of time, but there are irr...

AI Technical Summary

Problems solved by technology

At present, the power batteries used in electric vehicles mainly include lead-acid batteries, nickel-metal hydride batteries, and lithium polymer batteries. Among them, lead-acid batteries have matured technology after more than 100 years of development, and their cost is lower than that of nickel-metal hydride batteries and lithium polymer batteries. It is much lower, and new technologies in battery structure continue to improve the performance of lead-acid batteries, so lead-acid batteries will still be widely used in a certain period of time, but there are irreversible sulfation, plate bending and fracture, active material In addition to the differences in the production process, the causes of these disadvantages can basically be summarized as improper charging and discharging, such as the sulfation of the plate caused by long-term insufficient charging, and the positive grid caused by improper high-current charging control. Bending and breaking, a large amount of water loss, and thermal runaway lead to active material shedding, drumming, and inflation, which make the battery life continue to decay; Ni-MH batteries are mainly caused by problems such as charging heat, positive and negative electrode decline, and internal pressure rise. The reason is that when the battery is charging and discharging, the continuous oxygen evolution reaction of the positive electrode cannot be eliminated in time. At this time, the hydrogen evolution process will also occur at the negative electrode, resulting in a continuous increase in internal pressure, overheating, deformation of the casing, explosion, etc., which seriously affect the service life of the battery; The main problems of polymer batteries are charging heat and overcharging, which will lead to unbalanced capacity of lithium battery packs, and once the capacity balance of the battery changes, this change is irreversible and can be accumulated through multiple cycles, seriously Affect battery life

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