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Lithium battery pack active equalization system based on super capacitor energy storage transfer

A supercapacitor bank, active equalization technology, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve the problems of battery safety, service life, buffering, etc. that are not considered inrush current

Active Publication Date: 2021-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current equalization method is to balance the battery while allowing the battery to supply power to the external load. It does not consider that there may be an impact current that may affect the safety and service life of the battery. It should be considered to allow the equalization circuit to achieve balance on the battery at the same time. Realize the function of external power supply, so as to achieve the purpose of buffering

Method used

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  • Lithium battery pack active equalization system based on super capacitor energy storage transfer
  • Lithium battery pack active equalization system based on super capacitor energy storage transfer
  • Lithium battery pack active equalization system based on super capacitor energy storage transfer

Examples

Experimental program
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Embodiment 1

[0052] Such as figure 1 As shown, this embodiment discloses a structure diagram of an active balancing system for a lithium battery pack based on supercapacitor energy storage and transfer, Figure 4 Shown is a circuit diagram of the active balancing system of the lithium battery pack based on supercapacitor energy storage and transfer in this embodiment when the number of supercapacitors is three.

[0053] The controller generates two sets of PWM control signals with a duty cycle of 50%, and one set controls the switching bridge SQ 1 、SQ 2 、SQ 3 The high-side MOSFET and SQ 1’ 、SQ 2’ 、SQ 3’ MOSFET of the lower bridge arm; another set of control switch bridge SQ 1 、SQ 2 、SQ 3 The lower side MOSFET and SQ 1’ 、SQ 2’ 、SQ 3’ MOSFET on the high side. Therefore, each switching cycle is divided into two modes, named mode A and mode B respectively, and mode A corresponds to SQ 1 、SQ 2 、SQ 3 High-side conduction and SQ 1’ 、SQ 2’ 、SQ 3’ The lower bridge arm is turned on...

Embodiment 2

[0058] Such as figure 2 As shown, this embodiment discloses a structure diagram of an active balancing system for a lithium battery pack based on supercapacitor energy storage and transfer, Figure 5 Shown is a circuit diagram of the active balancing system of the lithium battery pack based on supercapacitor energy storage and transfer in this embodiment when the number of supercapacitors is three.

[0059] The controller generates two sets of PWM control signals with a duty cycle of 50%, and one set controls the switching bridge SQ 1 、SQ 2 、SQ 3 、SQ 4 The high-side MOSFET and SQ 1’ 、SQ 2’ 、SQ 3’ 、SQ 4’ MOSFET of the lower bridge arm; another set of control switch bridge SQ 1 、SQ 2 、SQ 3 、SQ 4 The lower side MOSFET and SQ 1’ 、SQ 2’ 、SQ 3’ 、SQ 4’ MOSFET on the high side. Therefore, each switching cycle is divided into two modes, named mode A and mode B respectively, and mode A corresponds to SQ 1 、SQ 2 、SQ 3 、SQ 4 High-side conduction and SQ 1’ 、SQ 2’ 、SQ...

Embodiment 3

[0064] Such as image 3 As shown, this embodiment discloses a structure diagram of an active balancing system for a lithium battery pack based on supercapacitor energy storage transfer, Figure 6 Shown is the circuit diagram of the lithium battery pack active equalization system based on supercapacitor energy storage and transfer in this embodiment when the number of supercapacitors is three.

[0065] The controller generates two sets of PWM control signals with a duty cycle of 50%, and one set controls the switching bridge SQ 1 、SQ 2 、SQ 3 、SQ 4 The high-side MOSFET and SQ 1’ 、SQ 2’ 、SQ 3’ MOSFET of the lower bridge arm; another set of control switch bridge SQ 1 、SQ 2 、SQ 3 、SQ 4 The lower side MOSFET and SQ 1’ 、SQ 2’ 、SQ 3’ MOSFET on the high side. Therefore, each switching cycle is divided into two modes, named mode A and mode B respectively, and mode A corresponds to SQ 1 、SQ 2 、SQ 3 、SQ 4 High-side conduction and SQ 1’ 、SQ 2’ 、SQ 3’ The lower bridge a...

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Abstract

The invention discloses a lithium battery pack active equalization system based on super capacitor energy storage transfer. The equalization system comprises two series battery packs, a controller, two groups of switch arrays and a series super capacitor bank. The controller generates two PWM signals with the same duty ratio to respectively control the upper bridge arms and the lower bridge arms of all the switch bridges in the two groups of switch arrays to be switched on and switched off, so that a battery with high electric quantity in the series battery pack charges the super capacitor bank, and the super capacitor bank outputs the electric quantity to the outside after storing the electric quantity; and also can discharge the battery with low electric quantity. According to the invention, the electric quantity and the output electric quantity are transferred through the series super capacitor bank, the impact of the current on the lithium battery during high-power output can be effectively buffered while the active equalization of the lithium battery is realized, and the contribution to the aspect of prolonging the service life of the lithium battery is outstanding.

Description

technical field [0001] The invention relates to the technical field of active equalization of battery energy, in particular to an active equalization system for lithium battery packs based on supercapacitor energy storage and transfer. Background technique [0002] At present, as an energy storage element, rechargeable batteries are widely used in uninterruptible power supplies, artificial satellites, electric vehicles and other fields. Lithium-ion batteries are considered to be One of the most attractive rechargeable batteries available. [0003] In high-power applications, such as electric vehicles, lithium-ion batteries must be connected in series to improve power supply capacity. However, due to the manufacturing process and other reasons of a single battery, the internal resistance, battery capacity, and terminal voltage of a single battery will be different. When the battery pack When charging and discharging as a unit, differences in the temperature and internal chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J7/34
Inventor 康龙云徐鹏罗璇林鸿业卢楚生万蕾
Owner SOUTH CHINA UNIV OF TECH
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