Lossless equalization improvement circuit for energy storage battery pack based on inductors and equalization method thereof

A non-destructive equalization and battery pack technology, applied in the direction of charge equalization circuit, battery circuit device, battery charging management, etc., can solve the problems of energy waste, increase the cost of equalization and improvement circuit, increase the load of battery thermal management, etc.

Inactive Publication Date: 2018-07-20
DONGGUAN DRN NEW ENERGY
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Problems solved by technology

For example, in response to the high remaining capacity of individual battery cells, some researchers have proposed a parallel resistor shunt method, which consumes the energy of the battery module with a high remaining capacity through the resistor by controlling the corresponding switching device. It is wasted in vain, and a lot of heat is gener

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  • Lossless equalization improvement circuit for energy storage battery pack based on inductors and equalization method thereof
  • Lossless equalization improvement circuit for energy storage battery pack based on inductors and equalization method thereof
  • Lossless equalization improvement circuit for energy storage battery pack based on inductors and equalization method thereof

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Embodiment Construction

[0033] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, and to analyze the advantages and spirit of the present invention, a further understanding of the present invention can be obtained through the following detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments.

[0034] The present invention is characterized in that: as figure 1 , when the number of batteries is n (n is an even number), when n is an odd number, the power of the last battery in the balance improvement circuit cannot be transferred to other batteries, so the number of batteries must be an even number. The batteries in the balanced improved circuit are named B1, B2...Bn from top to bottom; the number of energy storage inductors L in the balanced improved circuit is n / 2, and they are named L1, L3...Ln-1 from top to bottom ; The MOSFET tube switch is divided into two pa...

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Abstract

The invention discloses a lossless equalization improvement circuit for an energy storage battery pack based on inductors and an equalization method thereof, which reduces the number of energy storageelements in the equalization improvement circuit and simplifies and the equalization improvement circuit. The lossless equalization improvement circuit comprises a battery pack, wherein the battery pack is formed by sequentially connecting batteries B1, B2...Bn in series. The number of energy storage inductors L in the equalization improvement circuit is n/2, and the energy storage inductors L are respectively L1, L3...Ln-1 from top to bottom. Each energy storage inductor L is connected between a negative electrode of the corresponding battery and a source electrode S of an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) at the right end. The lossless equalization improvement circuit adopts the anti-parallel MOSFETs to replace the energy storage elements, the phenomenon of being unbalanced of the battery pack is improved through controlling on-off of the MOSFETs in the equalization improvement circuit and an energy storage effect of the inductors, the available capacity ofthe battery pack is improved, the maintenance and replacement cycle of the battery pack is reduced, and the service life of the battery pack is prolonged.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for reducing the number of energy storage elements in a balance improvement circuit and simplifying the balance improvement circuit. Background technique [0002] After the battery pack has gone through multiple charge and discharge cycles, there are roughly three situations in the distribution of the remaining capacity of each battery cell: the remaining capacity of some battery cells is high; the remaining capacity of some battery cells is low; The remaining capacity of some battery cells is high and the remaining capacity of some battery cells is low. [0003] In view of the above three situations, domestic and foreign scholars have put forward their own solutions. For example, in response to the high remaining capacity of individual battery cells, some researchers have proposed a parallel resistor shunt method, which consumes the energy of the battery module with a high rem...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016H02J7/0019H02J7/0022
Inventor 刘厚德康龙云卢楚生饶华兵辛创刘坤富
Owner DONGGUAN DRN NEW ENERGY
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