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What are the technical parameters of lithium iron phosphate battery
Time: Sep 15, 2022

What are the technical parameters of lithium iron phosphate battery

1. Capacity

The capacity unit is usually mAh or Ah, and the rated capacity is different from the actual capacity when used. Rated capacity refers to the total power that Wally can provide when the lithium ion battery is discharged to the cut-off voltage at a certain discharge rate under laboratory conditions. The actual capacity is generally not equal to the rated capacity, and is directly related to temperature, humidity, charge discharge ratio, etc. Under normal circumstances, the actual capacity is smaller than the rated capacity, sometimes even much smaller than the rated capacity. For example, in northern winter, if the mobile phone is used outdoors, the battery capacity will drop rapidly.
2. Energy density
Energy density refers to the amount of electricity that can be stored and released per unit volume or weight of the battery. There are two kinds of units: Wh/kg and Wh/L, which respectively represent specific energy by weight and specific energy by volume. The electric quantity here is the integral of the above capacitance (Ah) and the working voltage (v). In application, energy density is more instructive than capacity. The improvement of lithium ion battery energy density is a slow process, far lower than the Moore's Law of the integrated circuit industry, resulting in a scissors difference between the improvement of electronic product performance and the improvement of battery energy density, which is expanding over time.
3. Charging and discharging rate
This indicator will affect the continuous current and peak current of the lithium ion battery when it is working. Its unit is generally c. The continuous power and peak power indicators of the lithium-ion battery can be obtained by multiplying the current value corresponding to the charge discharge ratio by the working voltage. The more detailed the meaning of the charge discharge rate index, the greater the guiding significance in use. Especially, as the power source of electric vehicles, it is necessary to specify the duration and pulse rate indicators under different temperature conditions to ensure that the lithium-ion battery can be used within a reasonable range. The voltage of lithium ion battery includes open circuit voltage, working voltage, charging cut-off voltage, discharge cut-off voltage and other parameters.
4. Service life
The life of iron lithium ion battery is divided into two parameters: cycle life and calendar life. Generally speaking, the cycle life is expressed by the number of times the battery can be charged and discharged in cycles. Of course, there are conditions here. Generally, under ideal temperature and humidity, conduct deep charging and discharging with rated charging and discharging current, and calculate the number of cycles when the battery capacity declines to 80% of the rated capacity.
5. Internal resistance
In iron lithium ion batteries, lithium ions move from one pole to the other. The internal resistance of lithium ion batteries is composed of factors that hinder the movement of ions in the process. Its important part includes the physical internal resistance of the conductive part; Intrinsic impedance of electrochemical materials such as motor materials, diaphragms and electrolytes; When there is current in the battery, lithium ion sports will have a temporary new obstacle; These three parts together constitute the main body of the internal resistance.
The internal resistance is most sensitive to temperature, and it will change greatly under different temperatures. One of the important reasons for the degradation of lithium ion battery performance at low temperature is the excessive low temperature internal resistance of the battery.
7. Energy
To be exact, the power here should be the specific power. The specific power is the charge discharge power capacity of a single unit or the charge discharge power capacity of a battery cell per unit mass or volume. Whether lithium ion batteries can be charged and discharged with high power has been decided in the design

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