Analysis on the common sense of lithium battery use

Rechargeable lithium batteries There are many kinds of rechargeable lithium batteries, such as lithium vanadium oxide batteries, lithium batteries and newly developed lithium polymer batteries abroad. The following are the first two models, focusing on lithium batteries. Rechargeable lithium battery is currently the most widely used battery in mobile phones, but it is more refined, and there is no overcharge or overdischarge in use (it will damage the battery or make it scrap). Therefore, there are maintenance components or maintenance circuit batteries to prevent expensive battery damage. The charging requirements for lithium batteries are very high. It is necessary to ensure that the stop voltage accuracy is within 1%. Now major semiconductor device manufacturers have announced a variety of lithium battery charging ICs to ensure safe, reliable, and fast charging. Mobile phones are everywhere now. Some are nickel-metal hydride batteries, but more flexible are lithium batteries. Proper use of lithium batteries is of great significance to extend battery life. 1. Lithium vanadium oxide battery (li-v6o13) Lithium vanadium oxide battery uses lithium as anode, vanadium oxide as cathode, and inorganic salt and organic solvent as electrolyte. Its characteristic is that it can be charged. No. Taking 2 batteries as an example, the comparison between lithium vanadium oxide batteries and lithium manganese oxide batteries and lithium thionyl chloride batteries is shown in Table 5. It can be seen from Table 5 that because the extra voltage of the lithium vanadium oxide battery is only 2.8v and the extra capacity is small, the specific energy is the smallest compared with the other two lithium batteries. The important parameters of this cylindrical battery are shown in Table 6. It can be seen from Table 6 that its charging time (cycle life) is not long, so this rechargeable battery will soon be replaced by a lithium battery. 2. Lithium battery Lithium battery is the most widely used lithium battery. It can be made into flat rectangle, cylinder, rectangle and button shape according to the requirements of different electronic products, and several batteries are connected in series to form a battery pack. The extra voltage of the lithium battery is 3.6v (3.7v for some products). The stop charging voltage when fully charged is related to the anode information of the battery: the anode information is 4.2v graphite; the anode information is 4.1v coke. The internal resistance of different anode data is also different. The internal resistance of the coke anode is slightly larger, and the discharge curve is also slightly different, as shown in Figure 1. Generally called 4.1v lithium battery and 4.2v lithium battery. The stop discharge voltage of the lithium battery is 2.5v~2.75v (the battery manufacturer gives a working voltage scale or stop discharge voltage, each parameter is slightly different). Continuous discharge at a voltage lower than the stop discharge voltage is called overdischarge, which is harmful to the battery. Lithium batteries are not suitable for high current discharge and will shorten the discharge time (internal temperature rises and energy loss increases). Therefore, the maximum discharge current supplied by the battery manufacturer should be less than the maximum discharge current during operation. Lithium batteries have certain temperature requirements, and the manufacturer provides scales for charging temperature, discharging temperature and storage temperature. Lithium batteries have higher requirements for charging, and complex charging circuits are required to ensure the safety of charging. The accuracy error of the stop charging voltage is ±1% of the additional value (for example, the accuracy error of a 4.2v charged lithium battery is ±0.042v). The charging current of the lithium battery should be in accordance with the battery manufacturer's recommendation, and a limited current circuit should be used to prevent overcurrent (overheating). The commonly used charging rate is 0.25C~1C (C is the capacity of the battery, such as Cu003d800mAh, 1C charging rate is 800mA). During high-current charging, always test the battery temperature to prevent the battery from overheating and damage or explosion. 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: Analysis of power lithium battery and energy storage lithium battery technology