To understand how to conduct quality testing for lithium-ion batteries, it is first necessary to understand the performance indicators of lithium-ion batteries. So what are the performance indicators for the quality of lithium-ion batteries? There are three key indicators: electrical performance, cycle life, and safety. So the quality of lithium-ion battery testing can be divided into individual battery and module battery testing. The detailed steps of the method are as follows: 1. Post-storage charge recovery ability test. Post-storage charge recovery ability test is crucial to verify the capacity recovery of lithium-ion batteries after the specified storage time. 1. Lithium ion batteries are discharged at a constant current of 0.2C to the specified termination voltage (usually 3.0V) at an ambient temperature of (20 ± 5) ℃, then charged at a constant current of 0.2C to the termination voltage (usually 4.2V), and switched to constant voltage charging (usually 0.02C termination current); 2. Lithium ion batteries are discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge termination voltage; 3. Lithium ion batteries should be discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge termination voltage; 4. Calculate the capacity (Ah) of the battery discharged in step ⑤. 5. Lithium ion batteries should be stored in an open circuit for 90 days at an ambient temperature of (40 ± 2) ℃; 6. Lithium ion batteries should be charged according to step ① at an ambient temperature of (20 ± 5) ℃; 2、 Test of charge retention and charge recovery ability of lithium-ion batteries: The test of charge retention and charge recovery ability is crucial to verify the capacity retention of lithium-ion batteries after being stored for a period of time, and to recharge the batteries after the charge retention experiment to verify their capacity recovery. 1. Lithium ion batteries are discharged at a constant current of 0.2C to the specified termination voltage (usually 3.0V) at an ambient temperature of (20 ± 5) ℃, then charged at a constant current of 0.2C to the termination voltage (usually 4.2V), and switched to constant voltage charging (usually 0.02C termination current); 2. Lithium ion batteries should be stored in an open circuit for 28 days at an ambient temperature of (20 ± 5) ℃; 3. Lithium ion batteries should be discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge termination voltage; 4. Calculate the capacity (Ah) released by the lithium-ion battery in step ③; 5. The charge retention capacity should be expressed as a percentage of the calculated capacity compared to the rated capacity in step ④; 6. Within 24 hours after discharging in step ③, the lithium-ion battery should be charged according to step ①; 7. Lithium ion batteries should be discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge termination voltage; 8. Calculate the capacity (Ah) released by the lithium-ion battery in step ⑦; 9. The charge recovery capacity should be expressed as a percentage of the calculated capacity compared to the rated capacity in step ⑧. 3、 Cyclic life testing is crucial for verifying the charging and discharging times of lithium-ion batteries when their usable capacity drops to the allowable value. ① Lithium ion batteries are discharged at a constant current of 0.2C to the specified termination voltage (usually 3.0V) at an ambient temperature of (20 ± 5) ℃, then charged at a constant current of 0.2C to the termination voltage (usually 4.2V), and switched to constant voltage charging (usually 0.02C termination current); ② Lithium ion batteries should be discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge termination voltage; ③ Lithium ion batteries should be cycled at an ambient temperature of (20 ± 5) ℃, and the battery should be stored for no more than 1 hour between charging and discharging or between discharging and charging; ④ Lithium ion batteries should be discharged and charged in cycles according to steps ① and ② until the discharge capacity is less than 70% of the rated capacity
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China