Energy balance circuit for battery pack of electric vehicle

An energy balancing, electric vehicle technology, applied in electric vehicles, battery circuit devices, circuit devices, etc., can solve the problems of poor balancing effect and short balancing time, save space and cost, improve consistency, and simplify circuit structure. Effect

Active Publication Date: 2013-05-22
HANGZHOU GOLD ELECTRONICS EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the various existing equalization technologies have their own shortcomings, the equalization effect is poor, and it is difficult to improve the consistency of the battery pack in a short period of time, so it is not suitable for applications that require short equalization time and low energy loss. electric vehicle battery system

Method used

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  • Energy balance circuit for battery pack of electric vehicle
  • Energy balance circuit for battery pack of electric vehicle
  • Energy balance circuit for battery pack of electric vehicle

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] Such as Figure 1-3 As shown, in the electric vehicle battery pack energy balance circuit of the present invention, the battery pack is composed of more than two battery cells, and the battery cells are composed of six single cells connected in series. The balance circuit includes a balance controller, four Equalization sub-circuits, bus bars connected to each equalization sub-circuit, each battery unit is provided with an equalization sub-circuit, and the equalization sub-circuits are respectively connected to the equalization controller, and the equalization sub-circuit includes an isolated bidirectional flyback transformer The two ends of the primary coil of the isolated bidirectional flyback transformer are respectively connected to the positive and negative poles of the bus bar, the two ends of the secondary coil of the isolated bi...

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Abstract

The invention relates to an energy balance circuit for a battery pack of an electric vehicle. The circuit comprises a balance controller, a plurality of balance sub-circuits and a bus for connecting the balance sub-circuits, wherein each balance sub-circuit is arranged on each battery unit, is connected with the balance controller and comprises an isolated two-way flyback transformer and an electronic switch; the two ends of a primary coil of the isolated two-way flyback transformer are respectively connected with an anode and a cathode of the bus; the two ends of a secondary coil of the isolated two-way flyback transformer are respectively connected with an anode and a cathode of a single battery; one electronic switch is connected in series between the cathode of the single battery and the secondary coil; and one electronic switch is connected in series between the cathode of the bus and the primary coil. By the energy balance circuit for the battery pack of the electric vehicle, the consistency of the battery pack is improved in the shortest time, so that the service life of the battery pack is prolonged; and the circuit has the characteristics of obvious balance effect, wide application range and the like.

Description

technical field [0001] The invention relates to a battery group balancing circuit, in particular to an electric vehicle battery group energy balancing circuit. Background technique [0002] The battery packs of electric vehicles are connected in series. Due to the production process and other reasons, there are differences between the individual batteries. In the process of charging and discharging the battery pack, this difference will inevitably be enlarged. When charging, the battery with small capacity and poor performance There will be overcharge phenomenon; when discharging, the battery with small capacity and poor performance will be overdischarged; the capacity utilization rate of the battery pack will become lower and lower. If things go on like this, this vicious cycle process will accelerate the damage of the battery. Especially when using high power, it is easier to damage the battery. Only through battery management and maintenance can the service life be extend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 欧书旺刘爱华徐剑虹
Owner HANGZHOU GOLD ELECTRONICS EQUIP CO LTD
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