1. What is the use of testing battery internal resistance?
The vast majority of battery failure modes are accompanied by an increase in battery internal resistance, and testers can determine the degree of battery degradation based on the trend of internal resistance increase. Generally speaking, a 30% increase in internal resistance indicates a decrease in battery capacity. Users can set a reference value for comparison (reference internal resistance) in the battery internal resistance tester. Users can contact the battery manufacturer to inquire about the baseline value of the battery's internal resistance, or use the initial installation internal resistance value as the baseline.
2. Why is it not enough to only test the float voltage?
The floating charge voltage can reflect whether the charger is working properly, but cannot reflect the health status of the battery. When the battery capacity decreases, the floating charge voltage may still remain artificially high. However, a low float voltage may indicate a short circuit in the battery. The excessive floating charge voltage on a certain battery may be due to the charger needing to compensate for some batteries in the battery pack that have low floating charge voltage, in order to ensure that the entire set voltage reaches the set value.
3. Will the internal resistance measured by the battery resistance tester be different each time?
The excellent design of the battery internal resistance tester ensures that the repeatability of each internal resistance test is within the design accuracy range. The exquisite needle inner coil spring can effectively eliminate the influence of contact impedance, while the four-wire design can eliminate interference from line resistance. In order to achieve the most reliable reading, please contact the battery pole instead of the nut according to the requirements of the user manual during testing, to minimize measurement errors caused by human factors.
4. Does the battery internal resistance tester need to power off the battery when testing internal resistance?
No need, Wuhan Tuopu United Power Internal Resistance Instrument has excellent resistance to ripple interference and can complete various tests under battery floating charge state.
5. Why is it sometimes necessary to test the ripple of the battery?
Temperature runaway is one of the important reasons for shortening battery life, and excessive AC ripple or poor connection between batteries can cause an increase in internal temperature of the battery.