Multiple-mode high-efficiency energy equalizer for lithium ion battery system and control method thereof

A lithium-ion battery and energy equalization technology, applied in battery/fuel cell control devices, charge equalization circuits, batteries, etc., can solve problems such as energy inconsistency, achieve fast equalization speed, high transfer efficiency, and prevent mutual influence

Pending Publication Date: 2018-05-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of energy inconsistency between a large number of lithium-ion cells connected in series in large-scale lithium-ion battery energy storage systems and electric vehicle-mounted lithium-ion power battery systems, the invention provides a multi-mode high-efficiency energy equalizer for lithium-ion battery systems and its control method

Method used

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  • Multiple-mode high-efficiency energy equalizer for lithium ion battery system and control method thereof
  • Multiple-mode high-efficiency energy equalizer for lithium ion battery system and control method thereof
  • Multiple-mode high-efficiency energy equalizer for lithium ion battery system and control method thereof

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Embodiment 1

[0026] Embodiment 1: as Figure 1-4 As shown, a lithium-ion battery system multi-mode high-efficiency energy equalizer, for a battery system composed of N battery packs composed of N*m battery cells Bij, the equalizer consists of N gating switch matrices, N inductors, N +1 main control switch Mk with anti-parallel diode Dk, a flyback transformer T, N+1 capacitors Ck, a voltage source E, and N*m battery cells Bij and battery cell balancing module Aij; where The gating switch matrix is ​​composed of the double-layer power switch matrix H of the upper bridge arm and the double-layer power switch matrix S of the lower bridge arm. Each battery cell equalization module Aij is composed of two power switches and an inductor L. The power switch matrix of the upper bridge arm Both H and the lower bridge arm power switch matrix S are double-layer power switch matrixes composed of m pairs of power switches connected in reverse; lead wires are respectively connected to one end of the main...

Embodiment 2

[0033] Embodiment 2: as Figure 1-4 As shown, a lithium-ion battery system multi-mode high-efficiency energy equalizer, for a battery system composed of N battery packs composed of N*m battery cells Bij, the equalizer consists of N gating switch matrices, N inductors, N +1 main control switch Mk with anti-parallel diode Dk, a flyback transformer T, N+1 capacitors Ck, a voltage source E, and N*m battery cells Bij and battery cell balancing module Aij; where The gating switch matrix is ​​composed of the double-layer power switch matrix H of the upper bridge arm and the double-layer power switch matrix S of the lower bridge arm. Each battery cell equalization module Aij is composed of two power switches and an inductor L. The power switch matrix of the upper bridge arm Both H and the lower bridge arm power switch matrix S are double-layer power switch matrixes composed of m pairs of power switches connected in reverse; lead wires are respectively connected to one end of the main...

Embodiment 3

[0040] Embodiment 3: as Figure 1-4 As shown, a lithium-ion battery system multi-mode high-efficiency energy equalizer, for a battery system composed of N battery packs composed of N*m battery cells Bij, the equalizer consists of N gating switch matrices, N inductors, N +1 main control switch Mk with anti-parallel diode Dk, a flyback transformer T, N+1 capacitors Ck, a voltage source E, and N*m battery cells Bij and battery cell balancing module Aij; where The gating switch matrix is ​​composed of the double-layer power switch matrix H of the upper bridge arm and the double-layer power switch matrix S of the lower bridge arm. Each battery cell equalization module Aij is composed of two power switches and an inductor L. The power switch matrix of the upper bridge arm Both H and the lower bridge arm power switch matrix S are double-layer power switch matrixes composed of m pairs of power switches connected in reverse; lead wires are respectively connected to one end of the main...

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Abstract

The invention relates to a multiple-mode high-efficiency energy equalizer for a lithium ion battery system and a control method thereof. The equalizer disclosed by the invention is composed of N gating switch matrixes, N inductors, N+1 master control switches Mk with anti-parallel diodes Dk, a fly-back transformer T, N+1 capacitors Ck, a voltage source E and N*m battery units Bij and battery unitequalizing modules Aij, wherein the gating switch matrixes are composed of upper bridge arm double-layer power switch matrixes H and lower bridge arm double-layer power switch matrixes S; each batteryunit equalizing module Aij is composed of two power switches and an inductor L; and the upper bridge arm power switch matrixes H and lower bridge arm power switch matrixes S are double-layer power switch matrixes composed of m pairs of power switches in series-opposing connection. According to the multiple-mode high-efficiency energy equalizer disclosed by the invention, electric isolation of a battery pack can be realized, mutual influences among different battery packs are avoided, the fly-back transformer serves as an energy conversion medium, the size of the equalizer is reduced, and thetopology circuit is simple in principle.

Description

technical field [0001] The invention relates to a multi-mode high-efficiency energy equalizer for a lithium-ion battery system and a control method thereof, belonging to the technical fields of power electronics technology and energy balance management of battery packs. Background technique [0002] With the aggravation of environmental problems and energy crisis, green and environmental protection are widely concerned, and all countries advocate the development of green energy and reduce the use of fossil fuels. As a new energy vehicle, electric vehicles have received extensive attention, and their development has become an inevitable trend. Due to its small size, high energy density and no memory effect, lithium-ion batteries have been widely used in the field of electric vehicles. However, the rated voltage of lithium-ion batteries is low. In order to meet the voltage requirements, a large number of lithium-ion batteries need to be used in series. During the use of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H01M10/46H01M10/44B60L11/18
CPCH01M10/4207H01M10/425H01M10/4264H01M10/441H01M10/46H02J7/0014B60L58/22H01M2010/4271H01M2220/20Y02T10/92Y02T10/70Y02E60/10
Inventor 刘红锐杜春峰李博陈仕龙
Owner KUNMING UNIV OF SCI & TECH
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