Explanation of proper nouns for lithium batteries

Rated capacity:

The power value stated by the manufacturer is C 5mAh, that is, the power value that can be released when a fully charged battery is discharged to the termination voltage (2.75V) with a standard experimental current of 0.2C at 20°C. (for lithium batteries)

Cycle life:

Under certain conditions (20°C 0.2 C5), the battery is repeatedly charged and discharged, and the number of charge and discharge occurs when the battery capacity and other properties reach below the specified requirements (capacity is less than 60%).

Internal resistance:

The resistance between the positive and negative electrodes of a battery is the sum of the resistances of the current collector, electrode active material, separator, and electrolyte. In theory, the smaller the value, the better the performance. The internal resistance of the battery is an important parameter for the performance of the lithium-ion battery. The value of the internal resistance of the battery not only affects the power characteristics of the battery and the discharge rate of the battery, but also an important characterization of the internal structural characteristics of the battery.

Nominal voltage:

The average voltage of the whole process when the battery is discharged at 0.2 C is an approximate value.

Discharge curve:

The discharge plateau is a direct characterization of the battery discharge curve. That is, when the battery is fully charged and discharged at a certain rate of current, the voltage drops relatively slowly. The discharge plateau is usually expressed by the time it takes to discharge 1C to 3.6V.

Discharge capacity:

The amount of charge released when a battery is discharged.

Depth of discharge:

A measure of the degree of discharge. is the ratio of the discharge capacity to the total discharge capacity.

Self discharge:

It refers to the phenomenon that the battery's internal substances undergo chemical reactions without external work, resulting in the loss of battery energy (capacity). For example, batteries with large self-discharge often show the phenomenon of low voltage (or zero voltage) after being stored for a period of time.