The influencing factors of lithium ion battery performance analysis

Source: 2020 - 04 - 15 18:51 hits: once the influence factors of lithium-ion battery lithium battery charger lithium ion battery, should according to the time sequence control charging current and charging voltage, charging current and charging voltage can't overcharge, otherwise easy to damage the battery. Therefore, the study of dynamic lithium ion battery charger work must be clearly grasp the charge and discharge characteristics, the main factors influencing the performances of lithium ion batteries: voltage, current and temperature, on this basis to develop. 1. Voltage. The nominal voltage is commonly 3 lithium ion batteries. 6 v or 3. 7V( Depending on the manufacturer) 。 The end of charging voltage ( Also known as the floating voltage or floating voltage) , depending on the electrode materials is commonly 4. 1 v, 4。 2 v, etc. Under normal circumstances, the voltage of the cathode materials for graphite is 4. 2 v, the voltage of the cathode materials for carbon is 4. 1v。 For the same battery, even if the initial voltage, when the battery capacity reached 100%, termination voltage will reach the same level. In the process of for lithium ion batteries, if there is electricity if the pressure is too high, inside the battery can produce a lot of heat, make the battery structure is damaged or short circuit. Therefore, it is necessary to monitor the battery charging voltage, to control the voltage allows the voltage range. 2. The current. The need to control in the process of charging charging current. Battery charging current biggest is determined by the capacity of the battery. Nominal capacity symbols for C, the unit is' ampere hour ( Ah) '。 Calculation method for: C = IT ( 1 - 1) , of which I exiled for constant electric current, T for the discharge time. , for example, using a 50 to 50 current ah battery is full of battery for 1 hour. In this case the charging rate for 1 c, generally charge rate at 0. 1 - 1 c. In general, according to the different rate of charging, the charging process can be divided into the slow charge ( Also known as trickle charge) , fast charging and super-fast charging three types. Slow charging current at zero. 1c ~ 0. Between the 2 c. Quick charge charging current is greater than zero. 2 c, less than 0. 8 c; Ultra-fast charging of the charging current is greater than zero. 8c。 Because the battery internal resistance to a certain extent, so it's internal heat is related to current. When the working current of the battery is too large, the fever will cause the battery temperature rise more than normal, affect the safety of the battery, and even explode. At the beginning of the charge, if the battery discharge too deep, can not use large current directly to recharge the battery. As the charge continued, battery accepts the current ability will be enhanced. Therefore, in the process of recharge the battery, must according to the actual status of the battery to control the charging current. 3. The temperature. The performance of the battery is under the influence of battery temperature. Low temperature can affect the activity of the material inside the battery, high temperature will damage the battery internal material structure. General in - Between 20 ℃ ~ + 65 ℃.