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Improved cell-to-cell battery balancing circuit based on lc resonant circuit and its realization 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 increasing switching frequency

Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • 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 balancing circuit based on lc resonant circuit and its realization method
  • Improved cell-to-cell battery balancing circuit based on lc resonant circuit and its realization method
  • Improved cell-to-cell battery balancing circuit based on lc resonant circuit and its realization method

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Embodiment

[0037] figure 1 It is an 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 based on LC resonance circuit suitable for 4 series battery cells, including: a series battery pack including 4 series battery cells, two sets of switch selection modules, n LC resonance modules , switch drive circuit, microcontroller.

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

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Abstract

The invention discloses an improved Cell-to-Cell battery balancing circuit based on an LC resonant circuit and an implementation method. The balancing circuit includes a series battery pack, two sets of switch selection modules, n LC resonant modules, a switch drive circuit, and a microcontroller. device. The present invention uses the LC resonance module to not only realize the energy transmission between adjacent batteries, but also realize the energy transmission between the first and last battery cells of the series battery group, thereby achieving the balance of the series battery group and improving the battery life. The available capacity of the group. The invention has the following advantages: it uses the LC resonant module to realize zero-current switching, effectively reducing switching losses; it effectively increases the switching frequency, has fast equalization speed and reduces the circuit volume; the control method is simple and only requires two sets of complementary, The PWM pulse signal with fixed frequency and fixed duty cycle can control the two sets of switch modules.

Description

Technical field [0001] The invention relates to the technical field of series lithium-ion battery pack balancing, and specifically relates to an improved Cell-to-Cell battery balancing 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, lithium batteries generally have low cell voltages and require a large number of lithium batteries to be combined in series and parallel to meet different applications. During the production and manufacturing process, lithium batteries cannot maintain the consistency of internal resistance, capacity and other parameters. Therefore, in the application of lithium battery packs with cyclic charge and discharge, the voltage of single cells appears to be inconsistent, and becomes inconsistent as the number of charges and discharges increases. Aggravation causes some ...

Claims

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Application Information

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Patent Type & Authority Patents(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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