Overcharge and discharge of polymer 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 causes lithium ions to be inserted during charging; excessive charging causes excessive lithium ions to be embedded in the negative carbon structure, which causes the lithium ions in the sector to be released again. The charging amount is the charging current multiplied by the charging time. When the charging control voltage is constant, the charging current is larger (the charging speed is faster), and the charging amount is smaller. The battery charging speed is too fast and the termination voltage control point is improper, which also causes the battery capacity to be insufficient. Actually, the battery electrode active material does not fully react and stops charging. This phenomenon of insufficient charging is aggravated by the increase in the number of cycles.
　　 Discharge
　　 For the first charge and discharge, if the time is long (usually 3 - 4 hours is sufficient), then the electrode can reach the highest oxidation state (sufficient power) as much as possible, and the discharge (or use) is forced to The set voltage, or until the automatic shutdown, such as the ability to activate the battery capacity. However, in the ordinary use of the lithium ion battery, it is not necessary to operate, and it can be charged at any time according to needs, and it is not necessary to be fully charged when charging, and it is not necessary to discharge first. For the first time charging and discharging, it is only necessary to perform 1 to 2 consecutive times every 3 to 4 months.
　　 The battery capacity involves technology and cost. Polymer lithium-ion batteries can be divided into small batteries and large batteries according to their size. Small batteries are usually used in 3C electronic products. The related technologies and industries have developed very mature and the overall profit is reduced. trend. More than 85% of current polymer lithium-ion battery products are small batteries. Large batteries are also commonly known as power batteries. There are also two types of small power batteries and large power batteries. The former is mainly used for electric tools and electric bicycles, and the latter is used in electric vehicles and energy storage. Charging is an important step in the repeated use of batteries. The charging process of high-rate batteries is divided into two phases: a constant current fast charging phase and a constant voltage current decreasing phase. During the constant current fast charging phase, the battery voltage is gradually increased to the standard voltage of the battery, and then the constant voltage is turned under the control chip, the voltage is no longer raised to ensure that the battery is not overcharged, and the current is gradually reduced to the rise of the battery power. Set the value and finish charging.