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External energy storage unit and LC quasi-resonance-based battery pack equalization circuit and method

A technology of energy storage unit and equalization circuit, which is applied in the direction of charge equalization circuit, battery circuit device, circuit device, etc. It can solve the problems of long equalization time, small equalization current, and difficulty in achieving zero voltage difference of the battery, so as to achieve high-efficiency equalization, increase The effect of large balanced current and improved consistency

Active Publication Date: 2017-05-24
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the conduction voltage drop of the power electronic devices used, it is difficult to achieve zero voltage difference between battery cells, and the equalization current is very small, and the equalization time is long

Method used

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  • External energy storage unit and LC quasi-resonance-based battery pack equalization circuit and method
  • External energy storage unit and LC quasi-resonance-based battery pack equalization circuit and method
  • External energy storage unit and LC quasi-resonance-based battery pack equalization circuit and method

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0036] Such as figure 1 , a battery pack equalization circuit based on an external energy storage unit and LC quasi-resonance, including a series battery pack 101, a gating switch 102, an equalization bus, an LC series quasi-resonance unit 103, a buck-boost unit 104, an external energy storage unit 105, a voltage detection circuit and controller 106;

[0037] Wherein, the battery pack is composed of n energy storage batteries Bi (i=1, 2, . . . , n) connected in series. The LC series quasi-resonant unit is composed of an inductor Lr, a capacitor Cr and two bidirectional controllable switches S1 and S2. Cr and Lr are connected in series, one end is the positive pole of the balanced busbar, and the other end is the negative pole of the balanced busbar. One end of S1 is con...

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Abstract

The invention discloses an external energy storage unit and LC quasi-resonance-based battery pack equalization circuit. The circuit of the invention comprises a series-connected battery pack, a gating switch, an equalizing bus, an LC series quasi-resonant unit, a buck-boost unit, an external energy storage unit, a voltage detection circuit and a controller; n energy storage batteries are connected in series so as to form the series-connected battery pack; the gating switch includes 2n bidirectional controllable switches; the positive poles and negative poles of the energy storage batteries are respectively connected with the positive pole and negative pole of the equalization bus through the bidirectional controllable switches; the equalization bus is connected in series with the LC series quasi-resonant unit, the buck-boost unit and the external energy storage unit sequentially; the controller is connected with the gating switch and the LC series quasi-resonant unit; and the voltage detection circuit detects the voltage signals of the energy storage batteries and the buck-boost unit and transmits the voltage signals to the controller. With the equalization circuit and method of the invention adopted, the battery pack can be equalized actively, fast and efficiently, the overcharging and over-discharging of the batteries can be prevented, and the consistency of the batteries can be improved.

Description

technical field [0001] The invention relates to the field of equalization of series battery packs, in particular to a battery pack equalization circuit and method based on an external energy storage unit and LC quasi-resonance. Background technique [0002] In recent years, with the deteriorating air quality and the scarcity of oil resources, new energy vehicles, especially pure electric vehicles, have become the development hotspots of major automobile companies in the world today. As a key component of electric vehicles, the power battery pack has a major impact on the power, economy and safety of the vehicle. After multiple charging and discharging cycles of the power battery pack, the distribution of the remaining capacity of each battery cell will generally appear to be uneven. If it is not balanced, overcharging and overdischarging will easily occur. In this way, in actual use, the service life of the battery pack will be seriously affected, and there may even be a sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0019Y02E60/10
Inventor 康龙云王书彪卢楚生令狐金卿王则沣冯元彬
Owner SOUTH CHINA UNIV OF TECH
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