Today CNHL will introduce the knowledge of 11.1v lipo battery
capacity. The article mainly introduces three battery capacities of 11.1v lipo battery: theoretical capacity, rated capacity and actual capacity.
11.1v lipo battery capacity introduction
The capacity of the 11.1v lipo battery refers to the total power that the 11.1v lipo battery can discharge when it is fully charged. It is generally represented by the symbol Q, and the unit is mA h (milliampere hour) or A h (ampere hour).
The capacity of 11.1v lipo battery is an important criterion to measure the quality of the battery, which is closely related to the usage time of the battery. In the laboratory, the constant current or constant voltage discharge method is generally used to discharge the 11.1v lipo battery. By measuring the amount of electrical energy released by the battery during the entire discharge process or calculating the product of the discharge current and time, this is the 11.1v lipo battery. storage.
11.1v lipo battery capacity can be divided into rated capacity, actual capacity and theoretical capacity.
11.1v lipo battery theoretical capacity
It is the theoretical value of the total charge of the 11.1v lipo battery calculated by Faraday's law based on the electrochemical reaction inside the 11.1v lipo battery and under the condition that the internal lithium ions fully participate in the reaction. Because the theoretical capacity is equivalent to the ideal value, its value is greater than the rated capacity and the actual capacity of the battery, and the actual capacity is usually smaller than the rated capacity due to the loss of battery usage.
The ideal capacity is the limit value of the maximum power that the 11.1v lipo battery can release under theoretical conditions, that is, the chemical energy stored in the battery is completely converted into electrical energy without loss. In the actual discharge process, the discharge capacity is part of the ideal capacity due to the existence of other side reactions in the battery. The rated capacity is determined by the battery manufacturer and is directly calibrated on the outer surface of the battery.
11.1v lipo battery rated capacity
It is an important indicator used to express how much charge the battery stores, and it is also an indicator of how long the battery is used. The rated capacity is also called the rated capacity, and its value is the minimum amount of electricity that the battery can discharge under certain discharge conditions (temperature, discharge rate, etc.) in accordance with the relevant regulations of the relevant state departments. The rated capacity is the capacity indicated by the license manufacturer and is one of the important parameters of the 11.1v lipo battery.
11.1v lipo battery actual capacity
It is the maximum power that the 11.1v lipo battery can actually release under specific discharge conditions after the 11.1v lipo battery is bought in the store. The actual capacity of the battery is often calculated by the product of the discharge current and the discharge time. The actual capacity is not necessarily the capacity of the new battery, but also the capacity of the used 11.1v lipo battery. The actual capacity at this time is definitely less than the actual capacity of the new battery. . The actual capacity is the amount of electricity that the battery can release under the actual environment. The factors affecting the actual capacity are very complicated. The external ambient temperature, the manufacturing materials of the 11.1v lipo battery, and the use time will all affect the actual capacity of the 11.1v lipo battery. The power released by a fully charged battery under certain conditions is the integral of the discharge current and the discharge time. The calculation process is divided into two cases: constant current and AC.
Due to the aging of battery materials caused by recycling, the battery capacity will have a large deviation from the factory calibration capacity. The real discharge capacity of the battery is of great significance for 11.1v lipo batterySOC estimation. Therefore, the capacity calibration of the 11.1v lipo battery is required. Three 11.1v lipo batteries were selected, and the experimental objects were 1.4A·h/3.7V cobalt acid 11.1v lipo batteries, and the cyclic charge-discharge experiments were carried out at an indoor temperature of 23 °C.
The experimental results show that the discharge capacity of a single battery is always smaller than the charging capacity in the same cycle. This is due to the influence of the internal resistance of the battery. During the discharge process, the battery itself dissipates a part of the energy, which enables the battery to work. The energy released is always less than the energy charged.
The partners who read the whole text believe that they have some knowledge about the capacity of 11.1v lipo battery. The capacity of 11.1v lipo battery is an important criterion for measuring the quality of the battery, which is closely related to the usage time of the battery; the capacity of 11.1v lipo battery can be divided into rated capacity , actual capacity and theoretical capacity.
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