BT60x5 Precision Battery Tester

Application

The BT6065 and BT6075 high precision battery testers are designed for testing high capacity battery cells (not only) for electric vehicles with low internal resistance. The more economical BT6065 model with a 6-1/2 digit display is suitable for in-line tests in battery cell screening, while the 7-1/2 digit BT6075 model is designed for very accurate cell sorting at the beginning (BOL) and end-of-line (EOL) of the production line.

These battery testers combine the function of a very accurate DC voltmeter and internal resistance meter using an AC signal at 1 kHz, just like Hioki's previous BT356x series. However, the manufacturer has now added more sophisticated features for even more accurate and stable measurements of the latest generation battery cells:

MIR (Mutual Interference Reduction)

For the case where two testers are used in close proximity for parallel measurements, Hioki has come up with a special setting to reduce mutual interference (and thus oscillation of the measured values) without the need for any synchronization wiring:

Compensating for the effect of eddy currents in adjacent battery cells

Eddy currents are one of the other effects causing measurement errors when it comes to accurately determining the very low internal resistance values of battery cells connected in modules and enclosed in metal cladding (again, typically traction batteries for BEVs). Hioki therefore allows compensation of the measured IR values using pre-measured (i.e. known) reference values of the individual cells. This function is only possible in multichannel measurement mode (for multichannel measurement, the SW1001 or SW1002 multiplexer can be used).

Improved insensitivity to resistances along the measurement path

Compared to their predecessors, the testers of the BT60x5 series offer a higher tolerance to resistances arising, for example, due to resistance of the measuring leads or transient resistances at the probe-DUT interface.

At the same time, the testers continuously monitor the values of these resistances and allow the setting of an early alarm in case of wire damage or probe tip wear/destruction. This feature is especially appreciated by operators of continuously operating production lines, thanks to which a sudden probe/conductor defect during measurement can be detected in time, but also a still functional but already worn measuring tip can be replaced in advance.