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A detection method for a degraded single battery of a battery pack

A single battery and storage battery pack technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of single battery deterioration detection without public reports, and achieve the effect of low cost, simple method and high cost

Active Publication Date: 2017-10-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no public report on the method of single battery degradation detection

Method used

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  • A detection method for a degraded single battery of a battery pack
  • A detection method for a degraded single battery of a battery pack
  • A detection method for a degraded single battery of a battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The method for detecting the deteriorated single battery of the storage battery pack of the present invention has the following steps:

[0033] Step 1: Conduct a check discharge test on the battery pack;

[0034] Carry out in accordance with the requirements of "Technical Regulations for the Operation and Maintenance of Battery DC Power Supply Units for Power Systems" (DL / T 724-2000). The battery pack is composed of 24 single cells. Sensors are installed on both sides of each single cell to record the voltage, current, average Temperature and other data for subsequent processing.

[0035] The principle of the specific checking discharge experiment is to release 30% to 40% of the capacity of the battery pack. The specific detection standard is to set the cut-off voltage in advance. Once the discharge voltage drops below the set cut-off voltage, the discharge will be terminated.

[0036] A large number of experiments have shown that the battery pack can generally releas...

Embodiment 2

[0065] The difference between this embodiment and embodiment 1 is that in step 2, the method of calculating the skewness coefficient sc is used to judge whether the sample a is normally distributed, and the calculation formula of the skewness coefficient sc is as follows:

[0066]

[0067] Among them, a=(x 1 、x 2 ... x N ), N is the number of batteries in sample a; x i is the voltage value of the i-th battery in sample a, i=1, 2...N; and σ(x) are the mean and standard deviation of each voltage value in sample a respectively, which can be calculated by the following formula:

[0068]

[0069]

[0070] When the calculated skew coefficient sc is between -0.5 and 0.5, the sample a is considered to be normally distributed; otherwise, the sample a is considered not to satisfy the normal distribution.

[0071] The skew coefficient sc of the sample shown in Table 1 is calculated as 0, and the sample a is considered to be normally distributed.

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Abstract

Disclosed in the invention is a detection method for a deteriorating single battery of a storage battery pack. The method comprises steps: step 1, carrying out a checking discharging test on a battery pack and recording voltages of all single batteries of the battery pack at set time points during the discharging process; step 2, recording the recorded voltage values of all single batteries at last time points in the checking discharging test as samples a and determining whether the samples a are in normal distribution; if so, carrying out a step 3; and if not, carrying out non-linear conversion on the samples a to form the normal distribution; and step 3, finding out a confidence interval of the samples a, using the lower limit of the confidence interval as the standard, and determining single batteries lower than the standard in the samples a as deteriorating ones. According to the invention, the method is mainly used for detecting deteriorating single batteries in the on-line storage battery pack and the deteriorating single batteries can be found from the battery pack accurately. The method is simple; the efficiency is high; and the cost is low; and lots of manpower and materials are saved. And thus replacement of some expensive battery testing instruments can be realized to some extent.

Description

technical field [0001] The invention relates to an online detection method for a degraded single battery in a battery pack, belonging to the technical field of battery detection. Background technique [0002] The battery pack may fail after long-term use, which means that the battery pack cannot discharge the effective battery capacity of the rated ampere hours. In the initial stage of failure, the main sign of deterioration of the battery pack is that some single cells first deteriorate, and the voltage of these deteriorated single cells drops rapidly, which affects the normal operation of the surrounding batteries. As the degraded cells spread, it will lead to increased non-uniformity of the battery pack, which will eventually lead to a decrease in the performance of the entire battery pack. [0003] Therefore, the detection of degraded batteries is of great significance to maintain the performance of the whole battery pack. Therefore, it is necessary to detect these det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01R31/12
Inventor 程力袁世魁蔡体菁
Owner SOUTHEAST UNIV
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