Analysis of factors affecting the charging performance of LR03 alkaline battery

Factors affecting the charging performance of lithium-ion batteries

Lithium-ion battery charger

When charging lithium-ion batteries, the charging current and charging voltage should be controlled in chronological order. The charging current and charging voltage cannot be overcharged, otherwise the battery will be easily damaged. Therefore, the research work on dynamic lithium-ion battery chargers must clearly grasp its charging and discharging characteristics, that is, the important factors affecting the charging performance of lithium-ion batteries: voltage, current and temperature, and on this basis can it be gradually carried out.

1. Voltage. The nominal voltage of lithium-ion batteries is generally 3.6V or 3.7V (depending on the manufacturer). The charging end voltage (also called floating voltage or floating voltage) is generally 4.1v, 4.2v, etc. according to the specific electrode material. In general, the terminal voltage is 4.2v when the cathode material is graphite, and the terminal voltage is 4.1v when the cathode material is carbon. For the same battery, even if the initial voltage is different, when the battery capacity reaches 100%, the termination voltage will reach the same level. In the process of charging lithium-ion batteries, if there is electricity

If the pressure is too high, a lot of heat will appear inside the battery, causing damage to the positive structure of the battery or short circuit. Therefore, it is necessary to monitor the charging voltage of the battery and control the voltage within the allowable voltage range.

2. Current. The charging current should be controlled during the charging process. The maximum charging current of the battery is determined by the rated capacity of the battery. The symbol of the nominal capacity is C, and the unit is ampere-hour (Ah). The calculation method is: C=IT(1-1), where I is the constant current discharge current and T is the discharge time. For example, it takes 1 hour to fully charge a 50Ah battery with a current of 50A. The charging rate in this case is 1C, and the general charging rate is between 0.1-1C. Generally speaking, according to the different charging rates, the charging process can be divided into three types: slow charging (also known as trickle charging), fast charging and ultra-high-speed charging. The slow charging current is between 0.1c~0.2c; the fast charging current is greater than 0.2c and less than 0.8c; the ultra-high-speed charging current is greater than 0.8c. Because the battery has a certain internal resistance, its internal heat is related to the current. When the working current of the battery is too large, its heat will cause the battery temperature to rise above the normal value, affecting the safety of the battery and even causing an explosion. In the early stage of charging, if the battery is discharged too deeply, it is impossible to charge the battery directly with a large current. As the charging continues, the battery's ability to accept current will also increase. Therefore, in the process of charging the battery, the charging current must be controlled according to the specific state of the battery.

3. Temperature. The performance of the battery is also affected by the battery temperature. Too low a temperature will affect the activity of the internal materials of the battery, and too high a temperature will destroy the structure of the internal materials of the battery. Generally between -20℃~+65℃.

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