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Test method for single body cell DC internal resistance

A technology of DC internal resistance and testing method, which is applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring devices, etc. It can solve the problem of lack of battery internal resistance and achieve the effect of accurate data

Inactive Publication Date: 2014-06-25
HUIZHOU EPOWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no influence of ambient temperature and new or old batteries on the internal resistance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for testing the DC internal resistance of a single battery, comprising the following steps: S103: Set the SOC value of charging and discharging to 50%, adjust the ambient temperature of the battery box, and charge the battery cell with a constant current at a rate of 0.3C. When the upper limit is reached, the charge is cut off and left to stand for 1 hour; S104: To maintain the ambient temperature of the battery box, the battery is discharged at a constant current rate of 0.3C, and then left to stand for 1 hour after discharge; S105: Set the temperature of the battery box to the maximum working temperature, The humidity is 60%RH, the battery is charged at a rate of 0.5C for 10s, the tester records the change of voltage value, and the internal resistance of DC charging is used = Calculate the charging internal resistance, and let it stand for 1 minute; S106: Maintain the temperature and humidity, discharge the battery at a rate of 0.5C for 10s, record the voltag...

Embodiment 2

[0036] The difference from Example 1 is that, in addition to the technical solution described in Example 1, in this preferred embodiment, the following steps are also included before Step 1: S101: Adjust the ambient temperature of the battery box, and the battery is charged at 1C Rate constant current discharge, when the lower limit of the cell voltage is reached, the charge will be cut off, and the battery box will be left for 1 hour; S102 will adjust the ambient temperature of the battery box, and the battery will be charged at a rate of 0.5C, and the charge will be cut off when the cell voltage reaches the upper limit. Let the battery box stand still for 1 hour; S103 adjust the ambient temperature of the battery box, discharge the cells at a rate of 1C at a constant current, and when the lower limit of the cell voltage is reached, the charge will be cut off, and let the battery box stand for 1 hour; S104 Repeat steps S101-S103 at least twice Activate battery performance.

...

Embodiment 3

[0040] The difference from Example 2 is that step S107 is: according to the method of steps S105 and S106, sequentially set the battery cell to charge and discharge at different rates in 5C, record the change of voltage value with a tester, and calculate the charge and discharge internal resistance , After the test, let it stand for 30 minutes.

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PUM

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Abstract

The application discloses a test method for single body cell DC internal resistance. The test method comprises the following steps: an SOC value of charge and discharge is arranged to be 50%, ambient temperature of a cell box is adjusted, an electric core is charged with 0.3C rate constant current, and charging is cut-off when voltage upper limit is reached and then the electric core stands for 1 hour; the ambient temperature of the cell box is maintained, the electric core discharges with 0.3C rate constant current and stands for 1 hour after discharging; temperature of the cell box is arranged to be the highest working temperature with humidity of 60%RH, the electric core is charged for 10s with 0.5C rate, change of numerical values of voltage is recorded by a tester, and DC charging internal resistance=(img file='201310692279x100004dest_path_image002.TIF' wi='38' he='44' / ) is utilized to calculate charging internal resistance and the electric core stands for 1 minute; and the electric core is arranged to charge and discharge with different rates of 1C-5C in turn, and the change of the numerical values of voltage is recorded by the tester. The situation of influence of temperature in a certain range on DC internal resistance of the electric core can be tested via the method of testing cell DC internal resistance changing with working environment.

Description

technical field [0001] The invention relates to the field of battery testing, in particular to a method for testing the DC internal resistance of a single battery. Background technique [0002] Batteries are used more and more in electric vehicles and hybrid vehicles, and many battery systems generally use a series connection. The state deterioration of some single cells in the battery pack directly affects the capacity state of the battery pack as a whole, that is to say, the overall capacity state of the battery pack is determined by the capacity of a certain battery in the system or the battery with the most severely degraded state. Therefore, it is necessary to accurately test the state of the single battery to prevent the failure of the battery pack. [0003] The test of battery internal resistance is an extremely important part. At present, the methods of battery internal resistance test include DC discharge method and AC injection method. In the field of DC testing,...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/02
Inventor 刘飞文锋阮旭松龚敏明屈国庆
Owner HUIZHOU EPOWER ELECTRONICS
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