Parallel storage battery pack voltage difference control technology

Abstract

The invention belongs to the technical field of electric engineering, and relates to a parallel storage battery pack voltage difference control technology. When storage battery packs run in a parallel mode, the charging voltage and the discharging voltage of each storage battery pack are controlled to enable the parallel storage battery packs to work in a health state; differential charging and discharging of the parallel battery packs can be achieved according to needs, and during the differential charging and discharging processes, the performance parameters and the state of the battery packs are detected; therefore, the performance of the parallel battery packs is improved, the service life of the parallel battery packs is prolonged, the flexibility of state detection of the parallel battery packs is improved, and the technical foundation is established for saving the operation cost of the parallel battery packs and improving economical benefits.

Description

technical field [0001] The invention relates to a voltage control technology of parallel battery packs. During the parallel operation of the battery packs, the parallel battery packs can work in a healthy state by controlling the charge and discharge voltage of each battery pack; and the parallel battery packs can be realized as required. Differentiated charge and discharge, in the differential charge and discharge, detect the performance parameters and state of the battery pack; thus improve the performance of the parallel battery pack, prolong the service life of the parallel battery pack, improve the flexibility of the state detection of the parallel battery pack, and save It lays a technical foundation for reducing the operating cost of parallel battery packs and improving economic benefits. The invention belongs to the technical field of electrical engineering. Background technique [0002] During the use of battery packs, due to capacity or reliability reasons, parall...

AI Technical Summary

Problems solved by technology

This voltage difference will make the current unbalanced during the charge and discharge process of the parallel battery pack, and the charge will be uneven in the storage state.

When the parallel battery pack is in the state of floating charge, since the floating charge voltage is the same, there will inevitably be a contradiction between the storage capacity of the parallel battery pack and the high voltage of the single battery. energy, the float charge voltage should be as high as possible, but when the float charge voltage is increased, the terminal voltage of some of the battery cells will exceed the allowable value and work in an overcharged state, which will cause the battery cells to rapidly age and fail, resulting in the entire battery Faults occur in the parallel battery pack; if the floating charge voltage of the entire parallel battery pack is controlled according to the allowable voltage of the single battery in the parallel battery pack, the floating charge voltage will inevitably be low, and the overall energy storage of the parallel battery pack is too low, causing the energy storage device It cannot be used to the maximum extent; in the discharge process of the parallel battery pack, there is also the problem that the discharge capacity is in contradiction with the over-discharge of the single battery; at the same time, in the process of charging and discharging the parallel battery pack, the charging and discharging current is unbalanced, It has also become a hidden danger of failure of parallel battery packs

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