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Improved Cell-to-Cell battery equalization circuit based on LC resonance circuit and implementation method

A battery equalization and resonant circuit technology, applied in charge equalization circuits, circuit devices, battery circuit devices, etc., can solve problems such as slow equalization speed, achieve the effects of increasing equalization speed, reducing circuit volume, and reducing switching loss

Active Publication Date: 2021-07-23
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese invention patent of prior art 2 (application number CN201410698450.2) discloses an Adjacent-Cell-to-Cell equalization circuit based on LCL resonance conversion and its implementation method. Although soft switching is also realized in the energy conversion process, the energy It can only be passed between adjacent cells, so the equalization speed is still slow

Method used

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  • Improved Cell-to-Cell battery equalization circuit based on LC resonance circuit and implementation method
  • Improved Cell-to-Cell battery equalization circuit based on LC resonance circuit and implementation method
  • Improved Cell-to-Cell battery equalization circuit based on LC resonance circuit and implementation method

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Embodiment

[0037] figure 1 is the improved Cell-to-Cell battery balancing circuit based on the LC resonant circuit in this embodiment, wherein, figure 2 It is an improved Cell-to-Cell battery balancing circuit diagram based on LC resonant circuit suitable for 4 series-connected battery cells, including: a series battery pack including 4 series-connected battery cells, two sets of switch selection modules, and n LC resonant modules , Switch drive circuit, microcontroller.

[0038] The two groups of switch selection modules are respectively A group switch selection module and B group switch selection module, and the SA in the A group switch selection module 1 、SA 2 、SA 3 、SA 4 The two ends of the battery pack are respectively connected with each battery cell B of the series battery pack 1 , B 2 , B 3 , B 4 The positive and negative poles of the group B switch select the SB in the module 2 , SB 1 One end of each and the battery cell B 4 The positive and negative poles of the SB ...

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Abstract

The invention discloses an improved Cell-to-Cell battery equalization circuit based on an LC resonance circuit and an implementation method. The equalization circuit comprises a series battery pack, two groups of switch selection modules, n LC resonance modules, a switch driving circuit and a microcontroller. According to the invention, in virtue of the LC resonance modules, energy transmission between adjacent batteries is realized and energy transmission between a first battery cell and a last battery cell of the series battery pack are also achieved, so equalization of the series battery pack is realized, and the available capacity of the battery pack is improved. The invention has the advantages that zero-current switching is realized by using the LC resonance modules, and switching loss is effectively reduced; switching frequency is effectively improved, an equalization speed is high, and a circuit size is reduced; and a control mode is simple, and two groups of switch modules can be controlled only by two groups of complementary PWM pulse signals with fixed frequency and fixed duty ratio.

Description

technical field [0001] The invention relates to the technical field of equalization of series lithium-ion battery packs, in particular to an improved Cell-to-Cell battery equalization circuit based on an LC resonant circuit and an implementation method. Background technique [0002] Lithium batteries are widely used in many energy storage fields due to their high energy density and low self-discharge rate. However, the voltage of lithium batteries is generally low, and a large number of lithium batteries are required to be combined in series and parallel to meet different applications. In the manufacturing process, the lithium battery cannot maintain the consistency of internal resistance, capacity and other parameters, so in the application of lithium battery pack cycle charge and discharge, the voltage of the single battery is inconsistent, and with the increase of the number of charge and discharge Aggravated, making some battery cells overcharge or overdischarge, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02M3/156
CPCH02J7/0014H02J7/0019H02M3/156H02J2207/20Y02B70/10
Inventor 康龙云徐鹏林鸿业罗璇卢楚生李杰
Owner SOUTH CHINA UNIV OF TECH
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