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Battery historical data based active equalization method

A technology of active equalization and historical data, applied in charge equalization circuits, arrangement of multiple synchronous batteries, electric vehicles, etc., can solve problems such as small capacity of battery packs, achieve high equalization efficiency and improve consistency

Active Publication Date: 2016-06-01
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problem that the equalization method in the prior art leads to a small capacity of the battery pack, the present invention discloses an active equalization method based on historical battery data

Method used

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  • Battery historical data based active equalization method

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Experimental program
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Effect test

Embodiment 1

[0034] figure 1 Shown is the flow chart of the active equalization method in the charging process of the present invention, when charging starts, according to figure 2 The charge-discharge characteristic curve shown in the query battery module (composed of 3-cell ternary (LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ) composed of lithium-ion batteries connected in series), the electric quantity QA=10Ah, QB=9Ah and QC=8.5Ah corresponding to the voltage of all monomers in the last charging end.

[0035] Discharging process: In the discharging process before this charging, the discharge equalization process was carried out on A, and the absolute value of the balanced power was 0.5Ah. The charge equalization process was carried out on C, and the absolute value of the balanced power was 0.3Ah. Equilibrium treatment, so the equilibrium electric quantity of each monomer ΔQA=-0.5Ah, ΔQB=0 and ΔQC=0.3. According to the equalization process of the discharge process, it can be predicted that the pre...

Embodiment 2

[0041] also press figure 1 The flow chart of the active equalization method is shown, when charging starts, according to Figure 4 The charge-discharge characteristic curve is shown, query the electric quantity QA=51.6Ah, QB=45.6Ah and QC corresponding to the voltage of all monomers in the battery module (composed of 3 lithium iron phosphate lithium-ion batteries connected in series) at the end of the last charge = 39.6 Ah.

[0042] During the discharge process before this charge, equalization processing was not performed, so ΔQA=ΔQB=ΔQC=0, further calculations show that the predicted power state of each cell at the end of this charging is: QeA=51.6Ah , QeB=45.6Ah, QeC=39.6Ah.

[0043] According to the comparison, in this charging process, A needs to be discharged and equalized, and C needs to be charged and equalized. The average value of the predicted power is 45.6Ah. At this time, the battery aging coefficient is 1, which means that the actual capacity of the battery is e...

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Abstract

The invention relates to a charge-discharge technology for batteries, and provides a battery historical data based active equalization method. The active equalization method specifically comprises the steps of step 1, measuring voltage characteristic curves of different types of batteries under specified conditions; step 2, when a charging process is started, checking the electric quantity corresponding to the voltage of each single battery in the battery pack when the last charging process is finished; predicting the electric quantity of each single battery when the current charging process is finished without performing equalization according to the equalization electric quantity for each single battery in the last discharge process; step 3, calculating the average value of the predicted electric quantities of all the single batteries, and ranking the predicted electric quantities from higher to lower in sequence; finding out m single batteries with the maximum predicted electric quantity and n single batteries with the minimum predicted electric quantity; and taking the difference values between the predicted electric quantities of the single batteries and the average value of the predicted electric quantities of all the single batteries as the equalization electric quantity required values of the single batteries; and step 4, performing equalization based on the equalization electric quantity required values. According to the active equalization method, the residual electric quantity levels of the battery packs tend to be uniform through the active equalization, and / or the capacity of the battery pack is higher than that of the series-wound branch with the minimum capacity in the battery pack.

Description

technical field [0001] The invention relates to battery charge and discharge technology, in particular to an active equalization method based on battery historical data, which can actively equalize the remaining power level of battery cells in a battery module, thereby effectively increasing the capacity of the battery pack. Background technique [0002] The currently developed active equalization methods can be mainly divided into two categories. The first category (comparison document 1, CN201110101124.5) is to compare the terminal voltage and average voltage of battery cells in real time, so as to perform discharge equalization on cells with higher voltage. , and / or perform charge equalization on cells with lower voltages. The second category (comparison document 2, CN201510060954.6) is based on the open-circuit voltage, judging that when the open-circuit voltage can more truly reflect the remaining power level, equalization is performed after charging / discharging starts....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCH01M10/4207H01M10/441H01M2010/4271H02J7/0016Y02E60/10
Inventor 马瑞军王渊邹泷
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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