Battery charge/discharge testing is carried out as part of performance tests during battery cell, module, and pack development and during the evaluation stage. This type of testing allows manufacturers to inspect the battery’s charge and discharge performance as well as its service life.
The discharge test is started with the high current rate and when T1 is reached, the voltage at the battery terminals is recorded. Reduce the current to the second rate and proceed with the discharge test. A type 2 modified performance test is used when the duty cycle is more complex.
Only one pause is allowed for the duration of the test and the pause time should not be counted in the total discharge time2. Once the test is completed, determine the battery capacity. The test equipment can then be disconnected. While performing the discharge test, one should be prepared to bypass weak cells approaching polarity reversal.
The discharge test was performed on a battery bank with 56 cells and 112 V (2 Volts/cell) installed in Jan 2003. Its published ratings are shown in Table 2. The average cell temperature measured was 20 0C. A performance test was conducted at a constant discharge current of 95.1 A for a 3 hour time duration using the time adjusted method.
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