Lithium-ion batteries have high energy density and high uniform output voltage. Small self-discharge, good batteries, less than 2% per month (recoverable). There is no memory effect. The wide operating temperature range is -20℃～60℃. The reincarnation function is superior, it can be charged and discharged quickly, the charging efficiency is as high as 100%, and the output power is large. long lasting. It does not contain toxic and hazardous substances and is called a green battery.
Charge
It is an important step for the repeated use of batteries. The charging process of lithium-ion batteries is divided into two stages: constant current fast charging stage and constant voltage current decreasing stage. In the constant current fast charging stage, the battery voltage gradually rises to the standard voltage of the battery, and then switches to the constant voltage stage under the control chip. The voltage does not rise to ensure that it will not be overcharged, and the current gradually decreases to the battery power level. Set the value, and the final charge is completed. The power statistics chip can sample and calculate the battery power by recording the discharge curve. After repeated use of lithium-ion batteries, the discharge curve will change. Although lithium-ion batteries do not have a memory effect, improper charging and discharging will severely affect battery performance.
Things to note
Excessive charging and discharging of lithium-ion batteries can cause permanent damage to the positive and negative electrodes. Excessive discharge causes the negative carbon sheet structure to collapse, and the collapse will cause the lithium ions to be unable to be inserted during the charging process; overcharging causes too many lithium ions to be inserted into the negative carbon structure, and some of the lithium ions cannot be released anymore. The charging capacity is the charging current multiplied by the charging time. When the charging control voltage is constant, the larger the charging current (the faster the charging speed), the smaller the charging power. Excessive battery charging speed and improper termination voltage control point will also cause insufficient battery capacity. In fact, the battery's partial electrode active material will not be fully reacted and stop charging. This insufficient charging phenomenon is aggravated with the increase in the number of cycles.
Discharge
The first charge and discharge, if the time can be longer (generally 3-4 hours is enough), then the electrode can reach the highest oxidation state as much as possible (full charge), and the discharge (or use) will be forced to The battery capacity can be activated at the specified voltage, or until it is automatically turned off. However, in the ordinary use of lithium-ion batteries, there is no need for such manipulations and can be charged as needed at any time. It is not necessary to charge the battery until it is fully charged, nor does it need to be discharged first. The operation like the first charge and discharge only needs to be performed continuously 1-2 times every 3-4 months.