T/GDBIA 05-2023 Active

Main Technical Content: 7.2 Electrical Performance Testing 7.2.1 Initial Capacity The initial capacity of the battery is determined according to the method specified in GB/T 36972-2018, Section 6.2.1.2. The deviation rate between the initial capacity and the rated capacity specified in the battery technical specifications is calculated according to Appendix B. 7.2.2 Internal Resistance The battery's internal resistance is measured according to the method specified in GB/T 36972-2018, Section 6.2.8. Ten groups of batteries from the same batch are tested for internal resistance. The consistency of internal resistance is calculated according to Appendix A. 7.2.3 Low Temperature Performance Retention Rate The battery's low-temperature discharge capacity is measured according to the method specified in GB/T 36972-2018, Section 6.2.3. The battery's low-temperature performance retention rate is calculated as the percentage of the measured low-temperature discharge capacity compared to the initial capacity measured according to Section 7.2.1. 7.2.4 High Temperature Performance Retention Rate The battery's high-temperature discharge capacity is measured according to the method specified in GB/T 36972-2018, Section 6.2.4. The battery's high-temperature performance retention rate is calculated as the percentage of the measured high-temperature discharge capacity compared to the initial capacity measured according to Section 7.2.1. 7.2.5 Cycle Life The battery's cycle life is measured according to the method specified in GB/T 36972-2018, Section 6.2.7. When the discharge capacity falls below 80% of the initial capacity, the test is terminated, and the number of cycles at this point is recorded as the battery's cycle life value. Three groups of batteries from the same batch are tested for cycle life in parallel experiments. The lowest value of the three test results is taken as the cycle life measurement result of the battery in this batch. 7.2.6 Charge R