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SOC estimation method for out-of-service power battery pack

A technology for power battery packs and battery packs, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., and can solve problems such as differences and different battery charge and discharge capacities.

Inactive Publication Date: 2018-03-16
JINAN UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the difference in charge and discharge capacity of the battery at the same time due to inconsistent battery conditions, the overall SOC of the battery pack connected in series will be different from the SOC estimated separately

Method used

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  • SOC estimation method for out-of-service power battery pack
  • SOC estimation method for out-of-service power battery pack
  • SOC estimation method for out-of-service power battery pack

Examples

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Embodiment

[0099] The invention discloses a method for estimating the SOC of a decommissioned power battery pack, wherein the battery pack is formed by connecting multiple decommissioned battery packs in series, and each battery pack is obtained by connecting multiple single decommissioned batteries in parallel, such as figure 1 As shown, the steps of the estimation method are as follows:

[0100] Step S1, for each battery pack, after it is connected to the load, first obtain the open circuit voltage of the battery pack at the current moment in real time; then according to the open circuit voltage of the battery pack at the current moment, through the open circuit voltage and SOC of the battery pack The relationship table between obtains the SOC value of the battery pack at the current moment;

[0101] In this step, for each battery pack:

[0102] First establish the Thevenin second-order RC model of each battery pack, such as figure 2 As shown, the model includes two RC networks conn...

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Abstract

The invention discloses an SOC estimation method for an out-of-service power battery pack. For each battery pack, an open circuit voltage of the battery pack at a current moment is obtained in real time; according to a relationship table between the open circuit voltage of and the SOC of the battery pack, an SOC value of the battery pack at the current moment is obtained; the SOC value of each battery pack at the current moment is compared to obtain a minimum SOC value; relative value taking is carried out on the SOC values of all other battery packs expect the battery pack corresponding to the minimum SOC value by using the minimum SOC value as a standard; and an average value of the relative values of the SOC values of all other battery packs expect the battery pack corresponding to theminimum SOC value is calculated and an SOC value of the battery pack at the current time is obtained based on the average value and the minimum SOC value. Therefore, SOC value estimation can be carried out on the battery pack formed by the batteries with inconsistent conditions precisely and quickly; and the support is provided for recycling and reusing of the out-of-service batteries.

Description

technical field [0001] The invention relates to the field of new energy storage systems, in particular to an estimation of the SOC of a decommissioned power battery pack. Background technique [0002] The estimation of the State-of-Charge (SOC) and State-of-Health (SOH) of the battery pack, due to the special requirements of electric vehicles, is mostly based on the fact that the battery is in good condition and the state of the battery is relatively consistent in all aspects The battery pack obtained by connecting single batteries in series, and when the battery condition drops to a certain level, it will be decommissioned, causing a certain amount of waste. [0003] If the decommissioned batteries used in electric vehicles, etc. are recycled and recombined to form new battery packs, they can be used in the field of energy storage where the requirements for battery conditions are not so strict. At this time, the SOC estimation of the battery pack composed of decommissioned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘新东沈文锐张新征周曙
Owner JINAN UNIVERSITY
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