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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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  • Description
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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 equalization circuit based on an LC resonant circuit and a realization method. The equalization circuit comprises a series battery pack, two groups of switch selection modules, n LC resonant modules, a switch drive circuit, and a micro-controller. device. The invention utilizes the LC resonance module to realize not only the transmission of energy between adjacent batteries, but also the transmission of energy between the first and last battery cells of the series-connected battery pack, thereby realizing the balance of the series-connected battery pack and improving the battery performance. The available capacity of the group. The invention has the following advantages: the zero current switch is realized by using the LC resonant module, which effectively reduces the switching loss; the switching frequency is effectively increased, the equalization speed is fast, and the circuit volume is reduced; the control method is simple, and only two sets of complementary, The PWM pulse signal with fixed frequency and fixed duty cycle can control the two groups of switch modules.

Description

technical field [0001] The invention relates to the technical field of balancing lithium-ion battery packs in series, in particular to an improved Cell-to-Cell battery balancing circuit based on an LC resonant circuit and a realization method thereof. 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 a low single-cell voltage, and a large number of lithium batteries need to be combined in series and parallel to meet different applications. In the production process, lithium batteries cannot maintain the consistency of parameters such as internal resistance and capacity, so in the application of cyclic charge and discharge of lithium battery packs, the voltage of single cells is inconsistent, and with the increase of the number of charge and discharge times. Aggravating, making some battery cells overcharge or overdischarge, whic...

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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