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Equalization circuit for rapidly balancing battery pack of switch array and control method

A switch array and equalizing circuit technology, applied in the field of new energy vehicles, can solve the problem that the capacity, volume, cost and heat dissipation of the on-board online equalizer are difficult to solve, hinder the large-scale promotion and application of electric vehicles, and cannot effectively indicate the inherent differences of batteries, etc. problems, to achieve the effect of diversification, reduction of heat, and simple operation

Active Publication Date: 2016-05-04
HUIZHOU BNET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there have been many literatures discussing the consistency evaluation method of the battery pack, and a variety of equalization circuits have been proposed, but most of them are based on the external voltage difference between the batteries for consistency evaluation and implementation of equalization. Control, this evaluation method can not effectively indicate the inherent differences between batteries and lead to the degradation of the balance effect
This makes the capacity, size, cost and heat dissipation of the on-board equalizer difficult to solve; while the off-line equalizer will significantly increase the workload of battery maintenance, and ultimately hinder the large-scale application of electric vehicles

Method used

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  • Equalization circuit for rapidly balancing battery pack of switch array and control method
  • Equalization circuit for rapidly balancing battery pack of switch array and control method

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Embodiment 1

[0033] Embodiment 1 of the present invention provides an equalization circuit for rapidly equalizing a battery pack in a switch array, figure 1 It is a structural diagram of Embodiment 1 of the present invention, please refer to figure 1 , the equalization circuit includes a cell switch selection subcircuit, a resistance discharge combination subcircuit, a cell voltage acquisition subcircuit, and a switch control drive subcircuit; the cell switch selection subcircuit is used to connect the cells that need to be discharged battery, the resistance discharge combination sub-circuit is used to configure the discharge current, the cell voltage collection sub-circuit is used to collect the actual voltage value of each cell, and calculate the cells that need to be balanced, and the switch The control drive sub-circuit controls the corresponding switches to balance the battery pack.

[0034] The single cell switch selection sub-circuit includes a plurality of single cells and a plura...

Embodiment 2

[0041] Embodiment 2 of the present invention provides a control method for a balance circuit of a switch array that quickly balances a battery pack, figure 2 It is the method flowchart of the second embodiment of the present invention, please refer to figure 2 , the method of the embodiment of the present invention includes the following steps:

[0042] S101. After the low voltage on the battery management system starts to work, measure and store the actual voltage value of each single battery in the battery pack through the single voltage collection sub-circuit;

[0043] S102. Sort the collected cell voltages, calculate the difference between the highest cell voltage and the lowest cell voltage of the battery pack, and calculate the average value of all the cell cells in the battery pack;

[0044] S103. The average value of all cell voltages is compared with the lowest cell voltage, and if the difference is smaller than the threshold for equalization, the cell cells that a...

Embodiment 3

[0049] Embodiment 3 of the present invention provides a control method for the equalization circuit of the switch array fast equalization battery pack, which is a further improvement on the control method of Embodiment 2, combined with figure 1 , the specific method of this embodiment is:

[0050] S201. After the low voltage on the battery management system starts to work, measure the actual voltage value of each single battery in the battery pack through the single battery voltage acquisition circuit, and store it;

[0051] S202. Sorting the collected cell voltages, calculating the difference between the highest cell voltage and the lowest cell voltage of the battery pack, and calculating the average value of all the cell cells in the battery pack;

[0052] The method for sorting the collected cell voltages is as follows: put the collected cell voltages in a one-dimensional array, and find the maximum value and minimum value of the cell voltages by using a selection sorting m...

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PUM

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Abstract

The invention discloses an equalization circuit for rapidly balancing a battery pack of a switch array and a control method. The circuit comprises a single battery switch selection sub circuit, a resistance discharging combination sub circuit, a single voltage acquisition sub circuit and a switch control driving sub circuit, wherein the single battery switch selection sub circuit is used for conducting a single battery needed to be discharged, the resistance discharging combination sub circuit is used for configuring the size of a discharging current, the single voltage acquisition sub circuit is used for acquiring an actual voltage value of each section of single battery and calculating the single battery needed to be balanced, and the switch control driving sub circuit is used for controlling a corresponding switch and balancing the single battery. By the single battery switch selection sub circuit, balanced discharging of multiple sections of single batteries can be simultaneously achieved; and during discharging, the switch of the single battery switch selection sub circuit is selected and the switch of the closed resistance discharging combination sub circuit is matched to form a discharging loop, and the balance of the selected single battery is achieved.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, and more specifically relates to an equalization circuit and a control method for quickly equalizing a battery pack with a switch array. Background technique [0002] The power battery pack of an electric vehicle is composed of hundreds of strings of lithium-ion cells. The consistency between lithium-ion cells is crucial to the performance and life of an electric vehicle. The balance current of the current passive balance circuit is small, and the balance discharge circuit is fixed, which limits the size of the balance current, so it is difficult to quickly reduce the voltage value of the highest single battery. The consistency evaluation of battery packs is one of the cores of battery series application technology, which directly affects the safety and efficiency of battery packs. In the prior art, there have been many documents discussing the consistency evaluation method of the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014
Inventor 徐文赋任素云
Owner HUIZHOU BNET TECH CO LTD
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