There is no way to test it with a multimeter. There is a simple method. According to q=i square*r, heat is equal to the square of current × resistance. You can connect a few batteries in parallel. to see the heat and deduce it. I always use an internal resistance tester in my shop. As long as it is above 30 milliohms, we will eliminate it directly. Most of those purchased from a certain treasure store are above 35 milliohms. Automotive grade batteries are generally around 25. The larger the capacity, the 18650 internal resistance is much greater than large cells due to its small capacity. Let me tell you about the internal resistance of the lithium battery I produced: it used to have an internal resistance of 19 milliohms for 2200mah, but now it uses 2500mah and the internal resistance is 25 milliohms. These are grade A batteries forelectric vehicles, and Grade B batteries are generally above 30 milliohms. I typed it word for word, please accept it. Without an internal resistance tester, it cannot be measured
Can a multimeter measure the internal resistance of a lithium battery?
1. First of all, according to the physical formula R=U/I. , test the blue battery test system. The lithium battery is forced to pass a large constant direct current in a short period of time. The voltage at both ends of the lithium battery is measured at this time, as well as the current internal resistance of the lithium. the battery is calculated according to the formula.
2. Second, measure the battery open circuit voltage and battery terminal voltage during lithium battery discharge.
3. Finally, calculate the internal resistance based on the value obtained.
No.
The multimeter does notcannot directly measure the internal resistance of lithium batteries. The multimeter is a universal measuring tool that can measure parameters such as voltage, current, resistance and frequency. Lithium batteries, you need to apply a large current, correct and calculate the test values. The internal resistance of the lithium battery is a dynamic parameter, which will change with the usage state and the process of charging and discharging the battery. Only specialized internal strength testing. The instruments can make precise measurements of internal resistance. The instrument can provide stable current source and accurate measurement results.