Test items

Test the DC internal resistance of batteries.

System characteristics

1. The DCIR tester automatically tests the DC internal resistance of each single battery on the incoming battery tray, turns into a production management control system to automatically accomplish the binding of production data information and auto-saving, and transmits the data externally through network connections.

2. The DCIR tester, developed independently by our company which owns complete intellectual property rights, features high test precision, high reliability and stability, and can integrate seamlessly with automatic logistics equipment and technological equipment for the prior and next processes.

3. Embedded design is employed for the human-machine interface; the height of the display and operating platform meets the ergonomics requirements; the machine, featuring self-testing software and database system, is easy to operate, reliable and stable.

Functional characteristics

1. Based on the principle of BSEN61960, the evaluation method of DCIR adopts the two-stage load current test and calculates the DCIR value based on the voltage difference caused by the current change, which is closer to the actual resistance effect of continuous battery current application. Therefore, power battery or high-power energy type battery can be evaluated for the DCIR characteristics.

2. The power cabinet tester, with the switching response time shorter less than 15ms and pulse width shorter than 100ms, can instantly capture small change curve of current and voltage, providing an accurate and high precision test hardware platform for testing the DCIR of batteries. The software algorithm, developed in accordance with the HPPC standard test method, is approximate to the performance characteristics of the battery itself.

3. Due to the use of an alloy probe as the contact probe, the contact impedance is less than one half of that for similar probe of beryllium copper. In high temperature environment of 45℃, the overflow temperature rise for large current is less than 6℃.

4. Conduct shock test on battery with large current, calculate the DC internal resistance by dividing the voltage difference by the current difference, and the DCIR tester can screen out some batteries with damaged diaphragms in advance.

Test method

 A. DC internal resistance in discharging

     a1. 80A constant current, discharge for 10s [take voltage Vd0 in the 9thsecond].

     a2. 150A constant current, discharge for 10s [take voltage Vd1 in the 1stsecond].

     Stabilize for 20s.

B. DC resistance in charging

     a1. 80A constant current, charging for 10s [take voltage Vc0 in the 9thsecond].

     a2. 150A constant current, charging 10s [take voltage Vc1 in the 1stsecond].

     Stop.

Equipment parameters