Charge and discharge times and principle introduction of ternary lithium ion battery pack

Ternary materials have advantages in battery specific energy, specific power, high-rate charging, and low-temperature performance. In terms of cycle performance, lithium iron phosphate materials have obvious advantages. In terms of safety, lithium iron phosphate batteries are also superior to ternary materials. When choosing a battery, you can choose according to different purposes. For example, the space of the bus is relatively large, and the requirements for the specific energy and specific power of the battery are relatively low. The lithium iron phosphate battery can be selected to give full play to its good cycle performance. The space of the car is limited. If the amount is small, it is more appropriate to use high specific energy and high specific power ternary lithium-ion battery materials. The charging and discharging principle of ternary lithium-ion battery 1. Charging of a ternary lithium-ion battery The highest charge termination voltage of a single-cell lithium-ion battery is 4.2V, and it cannot be overcharged, otherwise the battery will be scrapped due to the loss of too much lithium ions in the positive electrode. When charging the ternary lithium-ion battery pack, a dedicated constant current and constant voltage charger should be used. First, charge with constant current until the voltage at both ends of the lithium-ion battery is 4.2V, then switch to constant voltage charging mode; when the constant voltage charging current When it drops to 100mA, stop charging. The charging current (mA) can be 0.1 to 1.5 times the battery capacity. For example, a 1350mAh lithium-ion battery can control the charging current between 135mA and 2025mA. The normal charging current can be selected at about 0.5 times the battery capacity, and the charging time is about 2 to 3 hours. 2. Discharge of ternary lithium-ion battery Due to the internal structure of the lithium-ion battery pack, all lithium ions cannot move to the positive electrode during discharge, and some lithium ions must be retained in the negative electrode to ensure that lithium ions can be inserted into the channel smoothly during the next charge. . Otherwise, the battery life will be shortened. In order to ensure that some lithium ions remain in the graphite layer after discharge, it is necessary to strictly limit the minimum discharge termination voltage, which means that the lithium ion battery cannot be over-discharged. The discharge termination voltage of a single-cell lithium-ion battery is usually 3.0V, and the minimum should not be lower than 2.5V. The length of battery discharge time is related to battery capacity and discharge current. Lithium-ion battery discharge time (hours) u003d battery capacity/discharge current, and the lithium-ion battery discharge current (mA) should not exceed 3 times the battery capacity, for example: a 1000mAh lithium-ion battery, the discharge current should be strictly controlled within 3A , Otherwise it will damage the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.