A cascade battery pack maintenance device
A technology for maintaining devices and battery packs, applied in battery circuit devices, secondary battery repair/maintenance, secondary batteries, etc., can solve the problems of high cost, large ripple, and narrow input and output voltage range, and achieve low cost and high performance. Good, the effect of fast circuit dynamic response
Active Publication Date: 2020-04-24
XJ POWER CO LTD +3
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Problems solved by technology
[0005] The purpose of the present invention is to provide a cascade battery pack maintenance device to solve the problems of the existing cascade battery pack maintenance devices with high cost, large ripples, and narrow input and output voltage ranges
Method used
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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0022] Such as figure 1 As shown, the cascaded battery pack maintenance device is mainly composed of two-stage power units. The second and third DC / DC circuits of the second-stage power unit are connected in parallel with the first DC / DC circuit constituting the first-stage power unit through inductance. In bridge series connection, the first-stage power unit is connected to the input terminal of the DC power supply, and the second-stage DC / DC power unit is connected to the cascade battery pack.
[0023] Attached below figure 2 Make a further detailed description of the main circuit of the cascade battery pack maintenance device. From figure 2 It can be seen from the figure that the DC / DC circuit is actually a voltage reversible chopper circuit. In each voltage reversible chopper circuit, the fully controlled device uses IGBT, and two IGBTs are connected...
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The invention relates to a maintenance apparatus for a gradient battery pack. The maintenance apparatus comprises a maintenance circuit and a monitoring unit. The maintenance circuit consists of a first-stage power unit connected to a direct-current power supply and a second-stage power unit connected to a gradient battery pack successively. The first-stage power unit includes a first DC / DC circuit; and the second-stage power unit at least includes a second DC / DC circuit and a third DC / DC circuit, wherein the two circuits are connected in parallel. The input terminal of the first DC / DC circuit is connected with the direct-current power supply and the output terminal is connected with input terminals of the second DC / DC circuit and the third DC / DC circuit; and output terminals of the second DC / DC circuit and the third DC / DC circuit are connected with the gradient battery pack. With the provided maintenance apparatus, the wide-range input and output of the direct-current voltage can be realized and the voltage and current ripples can be reduced; the dynamic response of the circuit is fast; various modes including a constant-voltage mode, a constant-current mode, and a first-constant-voltage and second-constant-current mode are provided, so that requirements of battery packs with different types can be met; and on the basis of the integrated structural design, the apparatus has characteristics of low cost, good performance, and easy maintenance.
Description
technical field [0001] The invention relates to the field of new energy, in particular to a maintenance device for cascaded battery packs. Background technique [0002] Echelon battery pack refers to such a type of battery pack: the energy storage of the battery pack has been greatly attenuated, the pressure difference of the cells in the battery pack is large, the internal resistance has increased significantly, and the number of charge and discharge cycles has reached a certain level. Most of the batteries that make up these cascade battery packs are eliminated by electric vehicles. Although such batteries are no longer suitable for use in electric vehicles, the energy storage of the battery pack is still at about 80% of the rated capacity, and can also be used in In other areas, direct elimination will cause serious energy waste. Therefore, in order to maximize and utilize the remaining value of the power battery and prolong the service life of the power battery, these p...
Claims
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IPC IPC(8): H02J7/00H01M10/42H01M10/48G01R31/36
CPCY02E60/10
Inventor 吕海超王翼陈世锋胡丽明李正力高鹏马瑞王涛于浩然
Owner XJ POWER CO LTD