Common parameters of lithium batteries (2)

Common parameters of lithium batteries (2)

3. Internal resistance:

The internal resistance of the battery is determined by the resistance of the plate and the impedance of the ion flow, the resistance of the plate is unchanged during the charging and discharging process, but the impedance of the ion flow changes with the concentration of the electrolyte and the increase or decrease of charged ions, and when the voltage of the battery decreases, the impedance will increase; Therefore, the general internal resistance of the battery takes the internal resistance of the battery when the nominal voltage is taken.

The smaller the internal resistance of the battery, the stronger the discharge capacity.

4. Charge and discharge ratio:

“C” is a special symbol to describe the current of the battery.

1C discharge represents the amount of current that discharges the battery from full to empty in 1 hour. A battery capacity of 2200mAh, then the 1C discharge current of the battery is 2.2A; if a battery is discharged with a high rate, it usually releases less energy than the low rate.

5. Cycle life:

Generally, the cycle life of lithium batteries is

300-500 times

, according to the lithium battery charge and discharge times of different materials from

300-3000 times

Range. According to the manufacturer’s specified charge and discharge ratio (such as 0.5C charge and discharge, each time from 0% charge to 100%, according to this cycle), after 500 cycles, the battery capacity is still 80% of the original.

The number of charges that can be used and the usage habits have a relatively large relationship.

6. Self-discharge rate:

The K value is a physical quantity used to describe the self-discharge rate of the cell, and its calculation method is divided into

The open-circuit voltage difference between the two tests is divided by the time interval between the two voltage tests, and the formula is 0CV2-0CV1/▲T

; The unit of K value is mV/h, and the K value of conventional cells is 0.03~0.15mV/h.

7. Consistency:

The consistency of lithium batteries refers to the difference between various parameters of lithium batteries, lithium battery packs comply with the principle of wooden barrels, and the performance of the worst battery determines the performance of the entire battery pack; The smaller the difference, the more the battery pack can play the performance of all cells, and vice versa, the greater the difference, the performance will decrease.

Regarding the common parameters of lithium batteries, the previous and next issues will give you respectively from the aspects of capacity, voltage, internal resistance, charge and discharge rate, cycle life, self-discharge rate, consistency, then our knowledge of lithium battery cells is over, and then there are knowledge points to supplement. In the content of later issues, Xiaopu will share some dry goods around the protective board of lithium batteries.

If you are also interested in lithium batteries, welcome to leave a message to exchange and discuss with Xiaopu ~ Or if you don’t understand batteries, you can also consult Xiaopu, after all, Xiaopu is professional in making batteries, which can make you less detours!

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