Battery capacity grading and forming system

Abstract

The invention discloses a battery capacity grading and forming system which comprises a DC / DC (Direct Current to Direct Current) bidirectional converter set and AC / DC (Alternate Current to Direct Current) high-frequency isolation bidirectional converters. The DC / DC bidirectional transform group comprises DC buses, a plurality of cells and DC / DC bidirectional converters with the same number of the cells; the AC ends of the AC / DC high-frequency isolation bidirectional converters are connected with an AC power grid; the DC ends of the AC / DC high-frequency isolation bidirectional converters are connected with the DC buses; one ends of the DC / DC bidirectional converters are electrically connected with the DC buses; and the other ends of the DC / DC bidirectional converters are connected with the cells. For conveniently applying the system, the AC / DC high-frequency isolation bidirectional converters can be connected in parallel. According to the invention, the AC / DC high-frequency isolation bidirectional converters are adopted, so that the safety isolation of a system common bus and the power grid is implemented; by control and setting of an upper computer, one part of DC / DC bidirectional converters charge the cells and the other part of DC / DC bidirectional converters discharge the cells, so that the energy sharing on the common DC bus is implemented, the energy does not need to be fed back onto the power grid and the impact and the harmful effects on the power grid can be reduced.

Description

[technical field] [0001] The invention relates to battery capacity separation and formation technology, in particular to a battery capacity separation and formation system. [Background technique] [0002] During the production process of the battery, it is necessary to carry out work such as chemical composition and capacity testing on the battery to convert the chemical materials packaged together into a real battery, and to evaluate the capacity and reliability of the battery. [0003] The traditional method is to use the linear charging method and the linear discharging method, that is, to control the constant current charging by connecting a MOS tube in series with the charging circuit, and to control the constant current discharging through another MOS tube connected in parallel with the battery. This method is inefficient and wastes a lot of energy. [0004] One energy-saving method is to charge through the charger and discharge through the discharge inverter during d...

AI Technical Summary

Problems solved by technology

This method realizes a set of devices for two-way conversion, but the power frequency transformer has a large weight and high cost. In the case of low power, there are problems of large volume and high cost.

[0006] The above methods can achieve energy saving, but since all energy needs to be fed back to the grid to be shared, the impact and impact on the grid will be greater, and the efficiency of energy sharing will be reduced due to the need for multiple transformations

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