1, the theoretical capacity: refers to the battery in an ideal state, its active substances all participate in the battery reaction can give the power. It is the highest theoretical value calculated based on Faraday's law. Features: In order to compare different series of batteries, the concept of specific capacity is commonly used, that is, the theoretical electricity that can be given per unit volume or unit mass of the battery, the unit is Ah/kg (mAh/g) or Ah/L (mAh/cm³).
2, rated capacity: is the battery capacity measured by the battery manufacturer under standard conditions, that is, the battery can output electricity under standard charging and discharging conditions. It is usually expressed in ampere-hours (Ah) or milliampere-hours (mAh) and is indicated on the battery's specification or nameplate.
Features: Rated capacity is one of the important indicators of battery performance, which reflects the storage capacity of the battery under normal use conditions.
3, the actual capacity: refers to the actual output power of the battery under certain conditions (such as a certain discharge rate, temperature, termination voltage, etc.). It is equal to the product of discharge current and discharge time, expressed in Ah or mAh. Features: The actual capacity is affected by many factors, such as temperature, humidity, charging and discharging ratio. In actual use, due to changes in various conditions, the actual capacity is often less than the rated capacity.
4, relationship and difference relationship: Theoretical capacity is the theoretical upper limit of battery performance, which reflects the maximum storage capacity of the battery in an ideal state. The rated capacity is the battery capacity determined by the manufacturer according to standard conditions, which represents the storage capacity of the battery under normal conditions of use. The actual capacity is the amount of electricity that the battery can output under actual use conditions, which is affected by a variety of factors and is less than the theoretical capacity and rated capacity. Difference: The difference between the ideal state and the actual state: the theoretical capacity is calculated based on the ideal state, while the actual capacity and rated capacity are determined under the actual conditions of use. Different test conditions: the rated capacity is determined under standard conditions, while the actual capacity is determined under various actual conditions of use. The relationship between the size of the value: usually, the theoretical capacity > the rated capacity > the actual capacity. However, it is important to note that this relationship is not absolute, as changes in actual capacity are affected by a number of factors. In summary, the theoretical capacity, rated capacity and actual capacity of lithium batteries are important parameters to describe battery performance. They are both related and different, and together constitute a comprehensive description of battery performance. In practical applications, we need to choose the appropriate battery type and specifications according to specific needs and conditions.
5, how to calculate the battery energy of the battery
1. Commonly used energy formula (simplified version) :lifepo4 battery energy (Wh)= rated capacity (mAh)× rated voltage voltage (V)/1000 formula directly through the capacity and voltage of the battery to calculate its energy, the unit is watt-hour (Wh), is a common expression of battery performance parameters. For example, if the capacity of a battery pack is 200Ah and the voltage is 370V, its energy is: Energy =200Ah×370V/1000=74KWh1 kilowatt-hour is equal to 1 kilowatt-hour, and the battery has 74 kilowatt-hours of electricity
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