Modular charging/discharging system of power battery pack of multifunctional electromobile

A technology for power battery packs and electric vehicles, which is applied to electric vehicles, battery circuit devices, collectors, etc., can solve problems such as grid harmonic pollution, reduce device reliability, and transformer loss, so as to improve dynamic voltage stability and reduce Backup power generation capacity and the effect of increasing the load rate of the grid

CN102025182AInactive Publication Date: 2011-04-20梁一桥
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a modular charging / discharging system of a power battery pack of a multifunctional electromobile, which aims to provide a system which can effectively meet the requirement for the bi-directional power transmission of a charging station and can exert the functions of peak clipping and valley filling as well as peak modulation and frequency modulation of a power grid. The technical scheme is as follows: the modular charging / discharging system of the power battery pack of the multifunctional electromobile comprises a charging-station monitoring system and an information management system, wherein the charging-station monitoring system is composed of a computer and a network communication system. The modular charging / discharging system is characterized by also comprising a three-phase step-down transformer, wherein the high voltage side of the three-phase step-down transformer is connected with a power grid, and the low voltage side of the three-phase step-down transformer is connected in parallel with a plurality of charging / discharging branches; each branch comprises a three-phase distribution transformer and a charging / discharging module, and the three-phase distribution transformer is connected in series with the charging / discharging module; and each charging / discharging module comprises a pulse-width modulation alternating current / direct current (PWM AC / DC) converter with the function of bi-directional power transmission, a plurality of electromagnetic isolation type DC / DC transform modules with the function of bi-directional power transmission and the information management system, and the electromagnetic isolation type DC / DC transform modules are connected in parallel.
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Description

technical field

[0001] The invention relates to the technical field of electric vehicle charging, in particular to a modular charging and discharging system for a power battery pack of an electric vehicle. Background technique

[0002] In recent years, as people pay more and more attention to social issues such as energy crisis and environmental pollution, energy-saving and environment-friendly new energy vehicles have become an inevitable trend for the sustainable development of the automotive industry. Among them, giving priority to the development of electric vehicles is of great significance to the transformation and upgrading of my country's energy structure and the leapfrog development of the automobile industry, and will surely become the main technical route of the national new energy vehicle strategy.

[0003] During the "Eleventh Five-Year Plan" period, the number of pure electric vehicles and hybrid electric vehicles put into use in Beijing has reached 1,000. Dur...

Examples

Embodiment 1

[0046] Embodiment 1: as Figure 4 As shown, in the bidirectional DC / DC conversion module, the main circuit topology of the high-voltage side IGBT or MOSFET module and the low-voltage side IGBT or MOSFET module are all single-phase full-bridge structures; the AC terminal of the high-voltage side IGBT or MOSFET module is connected to Between the high-voltage side of the high-frequency transformer, between the AC end of the low-voltage side IGBT or MOSFET module and the low-voltage side of the high-frequency transformer, there are high-frequency inductances Lc1 and Lc2 connected in series, and the high-frequency inductance can also be made by the high-frequency transformer The leakage inductance is realized; the DC terminal of the low-voltage side IGBT or MOSFET module is directly connected to the standard power battery pack.

Embodiment 2

[0047] Embodiment 2: as Figure 5 As shown, the difference from Embodiment 1 is that between the AC end of the high-voltage side IGBT or MOSFET module and the high-voltage side of the high-frequency transformer, between the AC end of the low-voltage side IGBT or MOSFET module and the low-voltage side of the high-frequency transformer An LC resonant circuit is connected in series to realize soft switching to improve the conversion efficiency of the converter. The LC resonant circuit is composed of a high-frequency inductor and a capacitor in series (the high-voltage side of the high-frequency transformer is La1 and Ca1 in series, and the low-voltage side is La2 and Ca2 in series).

Embodiment 3

[0048] Embodiment 3: as Image 6 As shown, the difference from Embodiment 1 is that a high-frequency inductor Lb is connected in series between the DC terminal of the low-voltage side IGBT or MOSFET module and the standard power battery pack.