Introduction to Rechargeable Battery Capacity

The rechargeable lithium battery capacity is the most important performance indicator of the rechargeable battery. The rechargeable battery capacity is usually represented by C. It refers to the charge that the rechargeable battery can provide under a series of specific conditions.

Provisions on the unit of measurement for the capacity of a rechargeable battery:

Charging battery capacity is usually expressed in milliamperes and amperes, according to the relevant EU regulations as follows:

1, portable rechargeable battery with "milliampere hour" or "ampere hour" expression, written as mAh and Ah respectively;

2, the capacity of the car battery should be expressed as "ampere hour" and "cold start ampere number", written as Ah and A respectively;

Second, the determination of charging battery capacity:

Batteries in full charging state, the capacity released when discharging to the cut-off voltage under a certain discharge system, is the battery capacity. For different types of rechargeable batteries, the method of determination is inconsistent. The EU's method system is as follows:

Portable rechargeable batteries are determined according to their internal chemicals according to the following criteria: nickel cadmium applies to IEC / EN61951-1 and IEC / EN 660622, nickel hydrogen applies to IEC / EN61951-2, lead acid applies to IEC / EN61056-1, Secondary lithium batteries are suitable for IEC / EN61960;

2, automotive batteries for IEC 60095-1 / EN 50342-1;

The label of rechargeable battery capacity shall include the contents, dimensions and location of the label.

1, the units used in the identification method of different electrical appliances are not consistent;

2, the size of the label is not uniform in the country. The EU has specific regulations. See European Commission Regulation 1103/2010;

3, the single cell label should be marked on the cell and cell package, and the battery pack should be marked on the shell instead of the cell; Car batteries are marked on the front of the battery package.

Fourth, the charging battery capacity has the actual capacity, theoretical capacity and rated capacity of the difference, this should be clear.

According to Lafardi's electrolysis law, assuming that all active substances on the electrode participate in the flow-forming reaction, the amount of electricity that the electrode should be able to release is called the theoretical capacity; The rated capacity, as mentioned at the beginning of this article, is the charge that the battery can provide under certain conditions. Compared with the theoretical capacity, it is the average value that a battery should achieve for numerous charges and discharges, usually smaller than the theoretical capacity.

There is also a nominal capacity, which is the capacity of the battery manufacturer for the battery, which is often compared with the actual capacity. For example: a rechargeable battery with a nominal capacity of 1600mAh, its rated capacity should also be 1600mAh, which means that the nominal capacity should be equal to the rated capacity, but if the actual capacity may not reach the nominal capacity, that is It does not reach its rated capacity. Some manufacturers use the values closest to the theoretical capacity to label the nominal capacity, which is a deception.

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