What are the important types of lithium batteries

Lithium battery (Li-ion) rechargeable lithium battery is currently the most widely used battery in modern digital products such as mobile phones and notebook computers, but it is more delicate and should not be overcharged or overdischarged during use (it will damage the battery or make it) scrapped). Therefore, there are protective components or protective circuits on the battery to guard against expensive battery damage. Lithium battery charging requirements are very high. To ensure that the termination voltage accuracy is within ±1%, major semiconductor device manufacturers have developed a variety of lithium battery charging ICs to ensure safe, reliable, and fast charging of large-capacity lithium batteries. Mobile phones basically use lithium batteries. Proper use of lithium batteries is very important to extend battery life. It can be made into flat rectangle, cylinder, rectangle and button type according to the requirements of different electronic products, and has a battery pack composed of several batteries in series and parallel. The rated voltage of lithium batteries, due to changes in materials, is generally 3.7V, and lithium iron phosphate (hereinafter referred to as ferro-phosphorus) positive electrode is 3.2V. The termination charging voltage during overflow is generally 4.2V, and ferrophosphorus is 3.65V. The termination discharge voltage of lithium battery is 2.75V～3.0V (the battery factory gives the working voltage range or the termination discharge voltage, each parameter is slightly different, generally 3.0V, and phosphorus iron is 2.5V). Continuous discharging below 2.5V (Phosphorus Iron 2.0V) is called overdischarge, and overdischarging will damage the battery. Lithium batteries with lithium cobalt oxide type materials as the positive electrode are not suitable for high current discharge. Excessive current discharge will reduce the discharge time (higher temperature inside and loss of energy) and may be dangerous; but lithium iron phosphate positive electrode The material lithium battery can be charged and discharged with a large current of 20C or more (C is the capacity of the battery, such as Cu003d800mAh, 1C charging rate, that is, the charging current is 800mA), which is especially suitable for electric vehicles. Therefore, the battery processing plant gives the maximum discharge current, which should be less than the maximum discharge current during use. Lithium batteries have certain requirements for temperature. The factory provides the charging temperature range, discharging temperature range and storage temperature range. Overvoltage charging will cause permanent damage to the lithium battery. The charging current of the lithium battery should be based on the proposal of the battery manufacturer, and a current limiting circuit should be required to avoid overcurrent (overheating). The commonly used charging rate is 0.25C～1C. It is often necessary to test the battery temperature during high-current charging to prevent overheating damage to the battery or explosion of large-capacity lithium batteries. Lithium battery charging is divided into two stages: first constant current charging, and changing to constant voltage charging when it is close to the termination voltage. For example, a battery with a capacity of 800 mAh, whose final charging voltage is 4.2V. The battery is charged with a constant current of 800mA (charging rate of 1C). At the beginning, the battery voltage is boosted with a larger slope. When the battery voltage is close to 4.2V, it is changed to 4.2V constant voltage charging. The current gradually drops and the voltage changes little. When the charging current drops to 1/10-50C (various factory settings, it does not affect the use), it is considered to be close to overflowing, and the charging can be terminated (some chargers will start the timer after 1/10C, u200bu200band the time will pass. After the end of charging). Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Which one is better than Ni-Cd batteries?