A charging device for a high-power power battery pack

Abstract

The invention discloses a charging device for a high-power power battery pack, which includes a three-phase transformer, a three-phase thyristor phase-shifting voltage regulation rectifier circuit, an IGBT negative pulse discharge circuit, a three-phase charging controller, and a battery pack management system; The primary of the transformer is connected to the three-phase power supply through a contactor, and the secondary is connected to the rectification circuit, and a secondary current and voltage sampling circuit is set between the rectification circuit and the battery pack; the IGBT negative pulse discharge circuit is connected in parallel to the battery pack Between the positive and negative poles; the battery pack management system is used to collect the voltage and temperature signals of each battery in the battery pack; the three-phase charge controller collects the current and voltage signals and the voltage of each battery according to the secondary current and voltage sampling circuit and temperature signal to control the contactor, the rectification circuit and the IGBT negative pulse discharge circuit to continuously charge the battery pack or to charge the battery pack in combination with intermittent pulse charging and negative pulse discharge; the invention has large output power, fast charging, and can prolong the life of the battery.

Description

technical field [0001] The invention relates to a charging device for a power battery pack, in particular to a charging device for a high-power power battery pack. Background technique [0002] According to the research and analysis of the Chinese Academy of Sciences, in the smog event last year, hydrocarbon organic particles from the exhaust of fuel vehicles accounted for 18%. Controlling smog has become a national strategy and a hot issue in the whole society. Vehicle exhaust emissions have become the main cause of urban pollutants. one. The electric vehicle with power battery as the new energy has opened up a new field of zero emission. It has become an important technical indicator for the rapid development of electric vehicles, in which the charging device plays a key role. There are two main problems in the existing charging device: [0003] 1) The output power is small and the charging speed is slow, which cannot meet the fast charging requirements of 2C or 4C elec...

AI Technical Summary

Problems solved by technology

This kind of charging device has serious unbalanced power consumption during the charging process, and the power factor fluctuates greatly, which will seriously affect the stability of local power grid power consumption, and the output power of the single-unit charging device is generally lower than 60kW; the other is single-phase High frequency, the basic principle is: three-phase input rectified into DC → converted into AC through IGBT → single-phase high-frequency transformer → rectified into pulsating DC → added to the battery pack

Although this kind of charging device solves the three-phase balanced input of the power grid, because it still uses a single-phase high-frequency transformer, the output power is also very limited under high-frequency working conditions, generally less than 30kW, and there are different degrees of high-frequency radiation and EMC issues

[0004] 2) The charging current is unscientific, which affects the service life of the power battery

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