Battery pack active equalization cascaded structure

A technology of active equalization and cascade structure, which is applied in the direction of electric vehicles, battery circuit devices, collectors, etc., can solve the problems of troublesome replacement, unfavorable modularization, and high withstand voltage requirements of the main switch tube, and achieves convenient application, simple circuit, The effect of large scalability

Active Publication Date: 2017-12-19
HANGZHOU BMSER TECH
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AI Technical Summary

Problems solved by technology

Although the above-mentioned transformer-based active equalization scheme has many advantages compared with the traditional passive equalization scheme, its disadvantages are also obvious, such as high requirements on the withstand voltage of the main switch tube, high-precision AD chip sampling battery voltage and MCU control equalization logic , only one battery can be balanced at a time, which is not conducive to modularization. If one component is broken, the entire balancing board needs to be replaced, which is quite troublesome to replace

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  • Battery pack active equalization cascaded structure
  • Battery pack active equalization cascaded structure
  • Battery pack active equalization cascaded structure

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these specific implementations. Those skilled in the art will realize that the present invention covers all alternatives, modifications and equivalents as may be included within the scope of the claims.

[0020] refer to Figure 3-8 , the battery pack active equalization cascaded structure, including a battery string formed by M battery packs 1 connected in series, M is an integer greater than 1, the battery string is provided with an N-level equalization module, and N satisfies 2 N ≤MN+1 integers, adjacent 2 m-1 Each battery pack 1 is provided with an equalizing module 2 to form an m-th level equalizing module, and the value of m is all integers from 1 to N. That is, equalization modules 2 are installed between adjacent single battery packs 1 to form a first-level equalization module, and equalization modules 2 are also installed be...

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Abstract

The battery pack active equalization cascade structure includes a battery string formed by M battery packs connected in series, where M is an integer greater than 1, and the battery string is equipped with N-level equalization modules cascaded and distributed, and N satisfies 2N Integers ≤M<2N+1, equalization modules are installed between adjacent 2m‑1 battery packs to form the mth level equalization module, and the value of m is all integers from 1 to N. The present invention adopts cascaded and distributed equalization modules, so that the active equalization current is large, and all single batteries can be equalized at the same time, and can be equalized when the batteries are charged and discharged, with high efficiency, high reliability, and convenient application.

Description

technical field [0001] The invention relates to an active balancing cascade structure of a battery pack. Background technique [0002] The battery pack will have consistency problems during use, which seriously affects the cycle life of the battery pack. [0003] The previous solution is that each battery unit is connected to a load resistor through a switch, and the unit with too high voltage is discharged during charging, that is, a passive balancing scheme is adopted. The specific structure is as follows: figure 1 shown. The above-mentioned passive equalization scheme is only suitable for suppressing the voltage rise of the strongest battery unit in the charging mode, and releasing excess energy as heat, which makes the entire system low in efficiency and high in power consumption. Generally, the maximum equalization current of this kind of circuit does not exceed 100mA, the equalization current is small, the equalization effect is poor, and heat dissipation is difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 张云程奚淡基任远程周逊伟
Owner HANGZHOU BMSER TECH
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