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

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...

AI Technical Summary

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 generated during the equalization process, which increases the load of battery thermal management

Some researchers have also proposed equalization improvement circuits such as bidirectional DC-DC equalization method and coaxial transformer equalization method. These circuits all use transformers, which increase the cost of equalization improved circuits.

Images