Analysis of a professional Battery Test Method-Battery Internal Resistance Test

Battery testing, as an indispensable part of Quality Control and Product Development, is of utmost importance. Its purpose is to understand the characteristics of the battery and to evaluate its ability to meet the application scenarios. For different application scenarios, the various test items of the battery will also be different. To manage the battery reasonably, it is necessary to carry out detailed tests before the battery can be used to achieve the best performance under different application scenarios and to select the appropriate battery testing method.

For different types of batteries, internal resistance is an important indicator for evaluating battery performance. Batteries with low internal resistance have strong discharge capability. Since the internal resistance is very small, it is usually measured in milliohm units. The internal resistance of the battery is small when it is delivered from the factory. After many uses, the active substances are lost and the internal resistance gradually increases, which affects the discharge effect of the battery, causing the battery to “go to bed”. In addition to the amount of charge, the amount of discharge should also be paid attention to in order to maintain the reliable operation of the battery. Therefore, battery internal resistance tester is very important for detecting the health status of the battery. In many cases, the increased internal resistance is a sign of the battery aging.

The internal resistance of a new battery is usually small, but the internal resistance of a battery that has been used for a long time will obviously increase. One point needs to be highlighted is that the internal resistance of a battery is not a fixed value, but changes with the battery power and life. Therefore, it is not enough to judge the health status of a battery only through the internal resistance value, other factors should also be tested in order to accurately judge whether the battery is aging or damaged. So the battery internal resistance tester plays a key role in battery internal resistance measurement.

Internal resistance is an important indicator in the battery and is usually measured by a special instrument, the battery internal resistance tester, to ensure the error control within the range of ±5%. The computing algorithm of the physical textbook taught with the resistance box is too low, and its simple formula is only applicable to theoretical teaching and cannot be used for practical application. Since the internal resistance is very small, it is generally defined in microohms and milliohms. Therefore, in the process of battery measurement, in order to prevent the accuracy error, it is necessary to correct the battery internal resistance tester for measurement.

Correct use of battery test methods – battery internal resistance tester is particularly important for battery maintenance. At present, there are two commonly used battery internal resistance measurement methods in industry applications: DC discharge method and AC voltage drop method. The former has a high measurement accuracy and the error can be controlled within 0.1% if the control is appropriate. However, many small capacity batteries can not bear large current in a short time; the latter has a low measurement accuracy, but it can measure almost all batteries, including small capacity batteries, and have little damage on the battery itself. In short, different methods should be used reasonably according to the types and capacities of the batteries.

In order to correctly measure the battery’s internal resistance, attention should be paid to the element errors of the testing instruments and the testing cables used to connect the battery. Since the internal resistance of the battery is very small, the line resistance will also affect the final measurement results. Therefore, it is recommended to use special connection lines and battery fixing frames to improve the accuracy of measurement. In addition, when using the battery internal resistance tester, the element errors of the instrument should be checked, and standard battery connection lines should be used to ensure the accuracy of the measurement results.

In conclusion, for the aged batteries, it is a difficult process to reduce the internal resistance to the lowest value and re-activate them. More importantly, when choosing batteries, we should choose those with low internal resistance as far as possible; in addition, in order to maintain the activity of the chemicals in the batteries, they should be used regularly to avoid the internal resistance being too high due to long-term stagnation. In a word, proper use and maintenance can ensure the normal operation of the battery and achieve the best performance.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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