It is generally around 0.30 ohms.
CATL lithium iron battery is a widely used type of battery and its internal resistance is an important indicator of battery performance. Generally speaking, the normal range of internal resistance of lithium-iron batteries is around 0.30 ohms.
Internal resistance refers to the resistance to the current flowing inside the battery when the battery is operating and is divided into AC internal resistance and DC internal resistance. For lithium iron batteries, the AC internal resistance and the DC internal resistance have different values. Generally, the AC internal resistance is greater than the DC internal resistance.
Simple measurement method:
1. Measure the open circuit voltage of the battery: U1
2. Connect a fixed resistance resistor: R in parallel to both ends of the battery for discharging. ;
3. Measurethe voltage across the battery during battery discharge: U2
4. Calculate the internal resistance of the battery: r=(U1; -U2)/(U2/R)< /p>
For example, if the open circuit voltage of a battery is 12 V and a 10 ohm resistor is connected in parallel, the voltage drops to 10 V, then the internal resistance of the battery is:
r=(U1-U2)/( U2/R)=(12-10)/(10/10)=2 ohms.
Generally, the greater the internal resistance r The larger the battery, the worse the battery charge. High-power batteries (The internal resistance r of small-power batteries (such as batteries) is generally very small. The internal resistance r of small batteries. -Power batteries (such as 9V laminated batteries) are generally relatively large .