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Equalization circuit and control method based on bipolar t-type dual resonant switched capacitor converter

A technology of switching capacitors and balancing circuits, applied in charge balancing circuits, battery circuit devices, current collectors, etc., can solve problems such as slow balancing speed, and achieve the effects of reducing switching loss, realizing energy transmission, and shortening balancing time.

Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent (application number CN201710017754.1) discloses a battery pack equalization circuit and method based on external energy storage unit and LC quasi-resonance, using external energy storage unit and LC resonance module to achieve energy balance, but the equalization speed is still slow

Method used

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  • Equalization circuit and control method based on bipolar t-type dual resonant switched capacitor converter
  • Equalization circuit and control method based on bipolar t-type dual resonant switched capacitor converter
  • Equalization circuit and control method based on bipolar t-type dual resonant switched capacitor converter

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Embodiment 1

[0046] figure 1 It is an equalization circuit based on bipolar T-type dual-resonance switched capacitor converter suitable for 2*N cells, including two series battery packs, switch network, equalization bus, bipolar T-type dual-resonance switched capacitor converter, A switch driving circuit, a voltage sampling circuit and a controller, wherein the voltage sampling circuit collects the voltage signal of each battery cell and transmits it to the controller.

[0047] Two series-connected battery packs share a bipolar T-type dual-resonant switched capacitor converter for equalization. The series battery pack A is connected to the balancing bus a through the switch network A 1 and a 2 connected to the bipolar T-type double resonant switched capacitor converter; the series battery pack B is connected to the balanced bus bar B through the switch network B 1 and b 2 connected to the bipolar T-type dual-resonant switched capacitor converter.

[0048] The bipolar T-type dual reson...

Embodiment 2

[0059] figure 2 It is an equalization circuit based on bipolar T-type dual resonant switched capacitor converter suitable for 2*2 cells. switch SA 1 , SA 2 , SA 5 , SA 6 and SB 1 , SB 2 , SB 5 , SB 6 Consists of an N-channel MOSFET. SA 1 (SB 1 ) and SA 5 (SB 5 ) D poles are respectively connected with battery A 1 (B 1 ) positive and A 2 (B 2 ) is connected to the negative pole, SA 1 (SB 1 ) and SA 5 (SB 5 ) of the S pole and the balanced bus a 1 (b 1 ) connection; SA 2 (SB 2 ) and SA 6 (SB 6 ) D poles are respectively connected with battery A 1 (B 1 ) positive and A 2 (B 2 ) is connected to the negative pole, SA 2 (SB 2 ) and SA 6 (SB 6 ) of the S pole and the balanced bus a 2 (b 2 )connect. switch SA 3 (SB 3 ) and SA 4 (SB 4 ) is composed of two N-channel MOSFETs connected in series with S poles, and the two ends are connected to battery A 1 (B 1 ) negative pole, balance bus a 1 (b 1 ) and battery A 1 (B 1 ) negative pole, balanc...

Embodiment 3

[0071] Assume that in the equalization circuit of the second embodiment, the battery voltage is VA 1 >VB 1 >VB 2 >VA 2 , after the voltage information of each battery cell is collected by the voltage sampling circuit, it is sent to the controller, and the controller judges A max -A min The value is the largest, then enter the balance mode 2, the energy from the battery A 1 pass to battery A 2 .

[0072] Figure 5is the direction of current flow during the equilibrium process, Image 6 is the corresponding theoretical waveform.

[0073] the positive state of charge of the capacitor, such as Figure 5 As shown in (a), the duration is t 0 'to t 1 '. at t 0 'moment, switch SA 1 and SA 4 on. battery A 1 through the inductance L 1 Charge the positive polarity of the capacitor C, the positive polarity of the capacitor voltage VC' rises, and the inductor current iL 1 ' Positive polarity rises and then falls to 0. at t 1 'moment, switch SA 1 and SA 4 Zero current...

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Abstract

The invention discloses an equalization circuit and a control method based on a bipolar T-type dual-resonance switched capacitor converter. The equalization circuit includes two series-connected battery packs, a switch network, an equalization bus, and a bipolar T-type dual-resonance switched capacitor. Converter, switch driving circuit, voltage sampling circuit and controller. The invention realizes the energy balance of the battery pack through the bipolar T-type dual-resonance switched capacitor converter, has the characteristics of fast balancing speed and flexible balancing path, and can effectively improve the available capacity of the battery pack. The invention realizes zero-current switching by utilizing the resonance of the inductance and capacitance, greatly reduces the switching loss, is favorable for increasing the switching frequency and reduces the circuit volume. The equalization circuit control method can not only realize the equalization within the series-connected battery pack, but also realize the energy transmission of the battery cells between different series-connected battery packs, and the equalization path is more flexible.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery pack balance, in particular to a balance circuit and a control method based on a bipolar T-type dual-resonance switched capacitor converter. Background technique [0002] Due to the advantages of small size, light weight, high energy density, low self-discharge rate, long cycle life, and no memory effect, lithium batteries are widely used in electric vehicles and energy storage power stations. However, the voltage and capacity of single-cell lithium batteries are usually very low, which cannot meet the requirements of electric vehicles and energy storage power stations. In order to improve the storage capacity and voltage level of lithium batteries, it is usually necessary to connect multiple lithium batteries in series and parallel. Different from electric vehicle battery packs, energy storage power stations have large capacity requirements and a large number of battery cells. In or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02M3/335
CPCH02J7/0014H02M3/33584H02M3/33507H02M1/0058Y02B70/10
Inventor 康龙云林鸿业罗璇卢楚生于玮
Owner SOUTH CHINA UNIV OF TECH
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