There are two main purposes for measuring the internal resistance of a battery.
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Internal resistance is one of the parameters that indicate a battery's ability to carry current.
When the value of internal resistance is low, the battery is able to carry a significant amount of current. On the other hand, a battery with high internal resistance can only carry a small amount of current.
Fig.1 shows an example of the internal configuration of a battery. Ideally, a battery's internal resistance should be zero, allowing for maximum current flow without any energy loss. In reality, however, as illustrated in Fig.1, internal resistance is always present.
Let's consider an example to illustrate this. The battery voltage is determined by the internal resistance and the output current. Suppose we have a battery electromotive force of E0=10 V. When the battery's internal resistance, RDC, is 1 Ω, and the load, R, is 9 Ω, the battery outputs a voltage of 9 V. However, if the internal resistance increases to 2 Ω, the output voltage drops to approximately 8.2 V.
In summary, internal resistance influences a battery's current-carrying capacity. The higher the internal resistance, the greater the energy loss, which is converted into "heat." This heat not only represents energy wastage but also contributes to the degradation of the battery.
The first reason for measuring internal resistance is to ensure quality control throughout production. It is possible to determine the quality of a battery by measuring its internal resistance.
However, how many ohms of internal resistance would be considered a high-quality battery?
Well, it depends on the type of battery. As shown in Fig. 2, depending on the material, structure, size, voltage, and other factors, different types of batteries have varied internal resistance levels. Fig. 3 illustrates how some batteries have several mΩ, while others have over 1 kΩ of internal resistance.
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The internal resistance of a battery is an important parameter for quality inspection during production and maintenance process.
Get the best performance out of your battery by measuring it properly.
The battery internal resistance tester is designed to measure the internal impedance and voltage of batteries. Its principle involves applying a 1 kHz alternating current (AC) signal to the test object and measuring the AC voltage drop to obtain the internal resistance value. In comparison to the principle of resistance measurement using a multimeter, the values obtained by the battery internal resistance tester are more accurate, reaching milliohm levels. Moreover, it can measure not only the resistance of passive objects but also the resistance of active objects.
• Fast and Reliable: It offers rapid testing speed and high reliability, enabling effective assessment of battery quality.
• High Accuracy: The measured internal resistance values can reach milliohm levels, making it more precise compared to traditional methods.
• Versatility: It can measure the resistance of both passive and active objects.
• Parameter Range Setting: Users can set the testing parameters within a specific range, and if the measured results exceed the set range, the microcomputer system will automatically trigger an alarm.
• Quality Assurance: To eliminate misjudgment and improve product quality, Shenzhen Hongda Electronic Equipment Co., Ltd. utilizes efficient testing instruments.
• Deficiency of alkaline batteries and lead battery measurement and life assessment
• UPS detection
• Factory inspection of batteries
• High -precision lithium battery internal resistance and voltage detection
• High -speed mass production random inspection of buttons
• Measurement of fuel cell group
• Test of high -voltage battery packs such as electric vehicle lithium batteries
• Multi -section series high -voltage lithium battery internal resistance and voltage measurement
• Measurement of hydrogen fuel cell resistance and voltage
• The supporting automatic sorting machine performs battery internal resistance+voltage automatic test
• The deterioration state and life evaluation of the battery
• ESR test of super capacitance (low internal resistance capacitor)
• Intelligent Alarm System: The KVR-208 microcomputer battery internal resistance tester features an intelligent alarm system, allowing users to set voltage and internal resistance ranges. If the measured results exceed the set range, the microcomputer system will automatically trigger an alarm.
• Program Intelligence: Equipped with an internal microcomputer system and single-chip control, achieving intelligent program operation.
• Easy Operation: Comes with a quick test rack and copper bar installation for convenient and fast operation.
• Strict Material Selection: All components are imported, utilizing original IC integrated circuits, ensuring fast operation speed and high reliability.
• High Testing Accuracy: Voltage resolution is 0.01V, while internal resistance resolution is 2Ω:1mΩ and 200mΩ:0.1mΩ.
• Fast Testing Speed: Capable of instantly displaying test results, improving work efficiency.
• Before use, check whether the instrument’s casing is intact, paying particular attention to the insulation near the connectors.
• Verify whether the testing probes are conducting electricity.
• Avoid contact between the two testing probes on the same fixture to prevent short circuits.
• Do not use the instrument near explosive gases, vapors, acidic environments, or dust.
• During measurement, ensure that the battery’s internal resistance and voltage are within the instrument’s measurement range; otherwise, the readings may be inaccurate. Exceeding the rated voltage (19.99V) may damage the instrument.
• It is strictly forbidden to measure high-voltage power sources!
• Included 4.3-inch LCD screen display, battery internal resistance R and voltage V are displayed at the same time;
• Minimum resolution 0.1uΩ, 10uV;
• High precision, good stability, the fastest test speed up to 100 times/second;
• Test lead contact check function;
• Built-in comparator function, 10-level sorting;
• Equipped HANDLER sorting interface to achieve automatic online function;
• Standard RS232 communication interface (Optional: RS485), support SCPI and Modbus (RTU) two communication modes;
• The test conditions are automatically saved, with 50 groups inside the instrument and 500 groups of setting files in the U disk
• Invention patent, no need to install software, it can upload test results to the computer directly.
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