Introduce the function of the battery

(5) Charging durability and recovery capacity: After being fully charged at room temperature for 28 days, the duration of charging and discharging time shall not be less than 1h36min (80%), and the time of charging and recovery discharging shall not be less than 1h48min (90%). (6) Storage function: Single battery or battery pack storage experiment should be selected for processing date less than 3 months, and capacity should be charged 50%~60% before storage, and the ambient temperature of the storage environment for 90 days is 40℃ ±5℃, relative humidity 45%~75%. After the storage period is over, take out the battery pack, charge it with 0.2c for 1h, and then discharge it for 0.5c at a constant rate, and discharge the battery to the final voltage. The above experiment can be repeated 3 times, and the discharge time is not less than 1h12min (60%). (7) Cycle life: The battery or battery pack is charged 0.2c and discharged 0.5c per cycle. When the continuous discharge capacity of 2 batteries is less than 72 minutes (60%), the test is suspended. The cycle life of a single battery is not less than 600 times, and the cycle life of a battery pack is not less than 500 times. (8) High-temperature shelf life: The processing date of a single cell battery is not more than 3 months, and the high-temperature shelf life test is carried out. The battery capacity should be filled with 50%±5% before placing, and then the battery should be placed under the strip with an ambient temperature of 55℃±2℃ for 7 days. Take out the battery after 7 days and place it at an ambient temperature of 20℃±5℃ for 2~5h. First discharge the battery to a stop voltage of 0.5c, charge 0.2c after 0.5h, discharge to a stop voltage of 0.5c after 0.5h, and then discharge to a stop voltage of 0.5c after 0.5c. This capacity is the recovery capacity. The above process is a one-week cycle, until the discharge time of a certain week is less than 72min (60%), the experiment is completed. Not less than 56 days (8-week cycle). 2. Safety function (1) Continue to charge: a single battery is charged 0.2ita with constant current. When the terminal voltage of the single battery reaches the charging limit voltage, it is changed to constant voltage charging for 28 days. After the test, there should be no leakage, no deflation, no rupture, no fire, no blasting (equivalent to full load). (2) Overcharge: The single-cell battery adopts a constant current regulated power supply and is charged at a constant current of 3C. When the voltage reaches 10V, change to constant voltage charging. Suspend charging until the battery explodes or ignites, or the charging time is 90 minutes, or the battery temperature is stable (45 minutes temperature difference ≤ 2 ℃). The battery pack is charged with a constant current of 0.5ItA with a constant current of 0.5ItA, and the voltage reaches n×5V (n is the number of single cells in series) and then transfers to constant voltage charging until the battery pack bursts or catches fire or the charging time is 90min or the appearance of the battery pack Stop charging when the temperature is stable (temperature difference within 45min≤2C), and the battery should not catch fire or burst. (3) Forced discharge (reverse charge): A single battery is first discharged to the terminal voltage with a constant current of 0.2ita, and then reversely charged with a current of 1ItA. The charging time is not less than 90min. Discharge a single battery in the battery pack to the stop voltage, and all other batteries are fully charged, and then use 1 ItA to discharge the battery until the battery pack voltage is 0V to stop the discharge. The battery should not catch fire or burst. (4) Short circuit test: Pass the external short circuit, 90 minutes, the temperature stability of the cell or battery surface (the temperature difference is 2 ℃ or less within 45 minutes), the short circuit should be suspended, the external circuit resistance should be less than 50 meters, the battery should be no fire, no Blasting; connect the battery pack is negative, and the resistance of copper wire less than 0.1 is connected to the battery voltage less than 0.2V or the battery temperature is stable (the temperature difference is 2 ℃ or less within 45 minutes), the battery should be no fire, no explosion statement: this Some pictures and content of articles published on the site are from the Internet. If there is any infringement, please contact to delete the previous article: Common problems and solutions of mobile phone battery charging