Does overcharging damage the lithium battery?

Long charging time and overcharging are not a concept. Overcharge means that the voltage during charging is higher than the charge cut-off voltage, generally 4.2V for lithium batteries. The voltage level determines whether the battery is overcharged, and has nothing to do with the charging time. Generally, due to the battery management chip in the charger or mobile phone, the maximum output voltage to the positive and negative ends of the battery is 4.2V. Even if it exceeds, there is a protection board built into the lithium battery. This means that the voltage to the cell will never exceed 4.2V. It won’t be overcharged for a long time. The subject can be recharged with confidence, it will not damage the phone battery. But be careful not to plug in the charger for too long, such as a day or two. If it takes too long, the charger will also consume electricity, and the phone will cut off the power, so that the battery will be used up, so it may start charging again, then full, and then use it again. This cycle, although the shallower Charging and discharging have little impact on the life of lithium batteries, but it is always the case that life is lost.

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If the lithium battery is deeply charged and discharged, the loss of the battery will be greater. The ideal state of the lithium battery is shallow charging and shallow discharge, in which case the battery life will be longer. According to the Shibao lithium battery engineer, the charge and discharge of a lithium battery is chemically a redox reaction. Physically, it is a reciprocating movement of lithium ions, so it is also a “swing” battery. During charging, lithium ions are released and inserted into the negative electrode. If overcharged, the structure of the positive electrode will collapse, and the negative electrode will be deposited on the surface of the negative electrode due to the insertion of excessive lithium ions; during discharge, lithium ions will escape from the negative electrode and return to the positive electrode. If excessively discharged, the negative electrode carrier fluid copper ions will be precipitated and run to the negative electrode The surface, even the surface of the positive electrode, affects the structure of the positive and negative active materials and fails. Lithium battery charging is generally set in two steps, divided into two processes, constant current charging process and constant voltage charging process, of which the constant current charging process accounts for most of the charging time, and the constant voltage charging is a trickle charging process during the charging process Pay attention to the occurrence of lithium battery overcharging. Regular lithium battery chargers will set the charging program according to the characteristics of the lithium battery. The lithium battery pack has a protective plate to prevent the lithium battery from overcharging. 1. Set the upper limit of lithium battery charging as required. Lithium battery charging current and charging voltage are the two most important parameters in lithium battery charging. This is not only related to the charging performance of lithium batteries but also related to the safety of lithium batteries. Large currents or more than lithium The upper limit of the battery charge will affect the performance of the lithium battery, or there may be dangerous situations such as fire and explosion. Therefore, when charging lithium batteries, pay attention to the charging voltage and charging current, and choose a lithium battery charger. If the charging voltage of a single-cell lithium battery is 4.2V, the charging voltage of a multi-cell lithium battery=4.2V*the number of lithium batteries in series. The minimum discharge voltage is 2.75V. In addition, pay attention to the discharge cut-off voltage of lithium batteries, that is, the discharge cut-off voltage of lithium batteries. The ideal discharge cut-off voltage of lithium batteries is 3.0, but the setting of the discharge cut-off voltage of lithium batteries in actual use will be different, usually It is lower than 3.0V in order to make full use of the battery power, and the most common is to set the discharge end voltage to 3.0V. When the battery is discharged to the final voltage, the battery must be charged.

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The main theme of the development of the battery industry in 2017 “Ternary lithium battery” has become the mainstream. “Improving quality and reducing costs” is the main theme of the industry development in 2017. The market is rapidly concentrating on leading companies and the industry differentiation has intensified. In the field of materials, the imbalance between the supply and demand of upstream raw materials has led to further price increases. The process of ternary materials’ high nickel content has accelerated, and the performance of lithium iron phosphate, diaphragm, and electrolyte has been steadily improved. The risk of a shortage of funds is also expanding. Compared with 2016, China’s lithium batteryindustry market has undergone two obvious changes in 2017: first, under the boom of investment expansion, mergers and acquisitions and reorganization, competition among leading companies has intensified; second, ternary lithium in the power battery field The battery market application will greatly increase. The application of ternary lithium batteries in the field of power batteries has become the mainstream this year. Large-scale lithium iron phosphate battery companies such as CATL, BYD, and Guoxuan Hi-Tech have all begun to increase the production capacity of ternary lithium batteries. From the perspective of various types of batteries, in the total installed capacity of 18.1GWh lithium batteries in the first 10 months of 2017, ternary/manganese batteries accounted for 55.03% of 9.96GWh, which is slightly higher than 54.49% in the first 9 months. Promote. Among them, the lithium manganate battery is less than 0.9GWh, and the lithium iron phosphate battery accounts for 43.51% of 7.88GWh, which is a decline compared with the 44.27% in the previous nine months. From the establishment of a dual-point policy, to an increase in the proportion of loan issuance, to the official launch of special license plates in multiple cities, the new energy vehicle industry continues to benefit from. Therefore, since the third quarter, my country’s electric vehicles began to pick up gradually, sales volume increased substantially, and the demand for batteries was also increasing. In the first three quarters of this year, the total installed capacity of vehicle power batteries in my country was 14.75GWh, a year-on-year increase of 24.14%. Therefore, battery companies have achieved greater growth in revenue. Currently, the most common batteries for new energy vehicles are ternary batteries and lithium iron phosphate batteries. Affected by the policy, the domestic lithium carbonate price as an indicator of lithium trading rose to 159,000 yuan per ton in mid-November, a record high.