Neware Battery Tester DCIR, DCR

DCIR - Direct Current Internal Resistance

Direct current internal resistance (DCIR) of batteries is the r esistance of current flowing through the battery, with the standard unit of measurement called the ohm.The value of DCIR is not fixed, and varies depending on multiple factors, such as battery materials, electrolyte concentration, temperature, and depth of discharge.

The variation of DCIR has a great influence on battery discharge performance, especially for high power batteries. In general, the better the battery, the lower the internal resistance. Therefore, most battery manufacturers identify DCIR as a key indicator to evaluate battery quality. The method of DCIR measurement is to inject high current into the anodeand cathode of the battery in a short period, and then record the changes of battery voltage and charge/discharge current. To calculate DCIR by Ohm’s Law, voltage variation is divided by current variation.

IEC 61960 - for Portable Applications

The test is conducted according to the IEC 61960 standard. First, discharge the battery at 0.2C for 10 seconds and record the V1 and I1 values. Then, discharge at 1C for 1 second and record V2 and I2 values.

Below demo data you need also download our BTSDA from Downloads page.

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IEC 61960 DCIR by Neware Battery Tester
DCIR HPPC by Neware Battery Tester

DCIR - HPPC or other simliar method for EV

DCIR method for EV is largely varied from those basic method for portable applications. Unlike only discharge DCIR is considered for those portable applications, DCIR for EV batteries has also charge DCIR. Specially, SOC related DCIR values are obtained to run simulation and for other uses. HPPC is a basic guidline for this. Moreover, ISO 12405-4:2018 developed this further with different pulse time.

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DCIR - Easy and Flexible Obtaining

With flexible Neware BTSDA, DCIR data could be easily identified and then calculated. Neware provides flexible data line indentifications to help you quickly mark the valued raw data from overvhelming data lines.
DCIR Settings on Neware Battery Tester

Why Neware Battery Tester for DCIR Tests

Response Fast

Response Fast
BTS 4000 has a general response time of 10ms. And 1ms for those current range lower than or equal to 12A. This makes the data more reliable since DCIR steps are usually brought out in seconds.

Accurate Timing

Accurate Timing
BTS 4000 has also a good accurate timing accuracy. This makes data repeatable and reliable.

10Hz Data Sampling Rate

10Hz Data Sampling Rate
BTS 4000 has a typic data samping rate of 10Hz, this makes your data selection points down to 100ms level. Higher data sampling rate allows you get more reliable DCIR result.
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A repeated pulse test is performed to calculate DCR value. Corresponding charging pulses are followed to maintain the batteries at the same SOC level. Below chart and plot shows BTS 4000 is both statistically and technically reliable.