Analysis of charging methods and precautions for use of polymer lithium batteries

The charging method of polymer lithium battery The charging and discharging of polymer lithium battery and liquid lithium battery are actually the same. There are two important methods: constant voltage charging and constant current charging, and the two can also be crossed. In constant current charging, the capacity of the battery is increased over time, and the internal resistance of the battery is also continuously increased, and the charging becomes slow. At this time, we should not think that the charging is complete, it will take a period of slow charging. While the general manufacturers of polymer lithium batteries first use constant current for charging when charging the battery, and then use constant voltage current for charging. The current, voltage, and cell phone power are all changing with time, which ensures that the cell phone’s battery can be fully charged quickly. At present, the charging method of polymer lithium battery generally adopts constant current and constant voltage charging: the battery is first charged with constant current CC, when the battery voltage rises to a certain value (4.2V), the voltage remains unchanged CV, and the current in the circuit drops to a very high value. Small, eventually tending to 0. Polymer lithium batteries cannot be overcharged. If overcharge occurs, the performance of the battery will be greatly affected. Metal lithium deposits on the negative electrode may cause the battery to explode or catch fire. At the same time, the solvent in the electrolyte decomposes, causing serious damage to the battery performance. . Precautions for the use of polymer lithium battery Conclusion 1: The polymer lithium battery needs to be recharged and activated when it is used for the first time or if it is not used for more than 1 month. The recharge activation time refers to the time added after normal full charge. You can ask the seller for the specific activation time. Generally, the larger the battery capacity, the longer the activation time, usually 1-6 hours. Conclusion 2: When the polymer lithium battery is used up, the battery will be more damaged when the battery is used up. Generally, it needs to be charged when the battery is 20%. Except for the first activation, you only need to charge 100% for normal use and unplug it. Excessive heat or cold environment can also damage the battery, but don't worry too much about 0-35 degrees Celsius. Conclusion 3: When the polymer lithium battery is stored or not used for a long time, you should shut down or unplug the battery connector. It is stated on the iPhone official website that it is beneficial to battery life when the battery is turned off and stored at 50% when not in use. Conclusion 4: According to the quality of the battery, the charging cycle of the polymer lithium battery is about 5001000, and it should be used for 2-4 years in standard use. After each charge and discharge cycle of a lithium battery, the power will be reduced a bit. Apple's official website says that it will be reduced to 80% after about 400 charge and discharge cycles. The so-called one charge-discharge cycle refers to a complete charge and discharge, that is to say, if you use 20% of the charge, it will be fully charged, and it will be counted as a charge-discharge cycle after 5 cycles. However, when the battery is exhausted, it will damage the battery. It is recommended to charge the battery at about 20%. Disclaimer: The articles published on this website are all from the Internet. If there is any infringement, please contact to delete it. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the hazards of lithium battery electrolyte to the human body and too little electrolyte injection?