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Common sense views on the use of common lithium batteries

by:Vglory      2021-05-14
Common sense point of using ordinary lithium batteries Lithium can survive as long as it is overcharged and short-circuited. The no-load voltage of a lithium battery can be used as a reference for energy storage. The voltage of each battery after 100% charging is 4.2v (some 4.1v). The lower limit voltage of each lithium battery is 2.5v. When the voltage across the battery drops to this voltage, the discharge must be stopped. If the battery discharges only 2V, it should be charged to 2.5V with a small current before normal charging; the very large charging current generally does not exceed 1C (Cu003dbattery capacity ampere/hour current, such as 1.35ah battery with 1.35a current), lithium battery The maintenance circuit is roughly planned based on such use characteristics. There are many dedicated maintenance circuits for lithium batteries, but I think it is too complicated to use. I also have an old m8400 mobile phone, which can be used as a lithium ion test bed in addition to good call quality. When the battery power is as low as 5V, the phone will automatically shut down, so there is no need to worry about excessive battery discharge. But the electric tiger ate very hot, waited, and talked at the speed of 50mA and 200mA. I use two 18650P lithium batteries, without a series maintenance circuit, using 7.2v, 24 hours without shutting down, and charging every day (not on time). I haven't noticed any decline in capacity within a year. I made two chargers: one is a switching power supply, the voltage is set to 8.4v, and the very large current limit is set to 1.4a; the other is a 12V power supply, 7809 three-terminal regulator, 7809 output, 0.7v voltage drop diode. The charging time can be unlimited, but it usually takes one or two hours to charge. Lithium also has a feature: if the battery is discharged with a current of 1/4c, it can release 100% of its capacity; if you use 1C to remove the electricity, the battery can only release 60% of its capacity. This feature should also be considered when designing lithium battery packs for electrical appliances. 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: Analysis of the performance comparison of hydrogen fuel power batteries and ternary lithium batteries
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