Hioki LR8101 – Modular Data Logger (Standard Model)

• Connect up to 10 measurement modules
• Control the instrument and transfer data using communication commands
• HIL (Hardware-in-the-loop) support with a data output interval as short as 5 ms
• *** This product does not include an AC adapter; AC Adapter Z1016 or Power Cable L1012 must be purchased separately ***
• *** At least one measurement module is required for this product to function; see parts M7100 and M7200 below ***

Battery packs consist of many cells connected in series. Since variability in cell characteristics can lead to a decline in the battery pack’s overall performance, it’s critically important to ascertain voltage and temperature behavior at the cell level.

Manufacturers are designing batteries of increasingly high voltage for use in electric vehicles (EVs). As battery voltages rise from 400 V to 800 V, it becomes harder to measure battery cells’ voltage and temperature safely. Instruments used to conduct charge/discharge testing of these high-voltage battery packs must now have higher terminal-to-ground and module-to-module voltage then before.

This product needs to be coupled with measurement modules to connect to devices under test.

See the table below for a comparison of the differences between the LR8101 and LR8102 loggers. The added features of the LR8102 allow for faster logging and more measurement channels.

Modules are required to connect the data logger to the device under test. The loggers can be combined with measurement modules to easily expand the number of input channels to a maximum of 300 channels for the LR8101 and 3,000 channels for the LR8202. Modules are sold separately. Their capabilities are described below.

• 15 channels (voltage/temperature)
• 300 V DC insulation between channels
• 1500 V DC/1000 V AC (CAT II) between terminals and earth
• 1500 V DC/1000 V AC between modules
• 5 ms sample rate voltage (when using 1 ch to 8 ch)
• 10 ms sample rate temperature
• 10 ms to 10 s sample rate (when using 9 ch to 15 ch)

• 30 channels (voltage/temperature)
• 300 V DC insulation between channels:
• 600 V DC/600 V AC (CAT II) between terminals and earth
• 600 V DC/600 V AC between modules:
• 10 ms sample rate (when using 1 ch to 15 ch)
• 20 ms to 10 s sample rate (when using 16 ch to 30 ch)

Although the voltage of individual cells in a battery pack is low at about 4 V, measuring cell voltages in an 800 V battery pack, for example, requires an instrument with a maximum terminal-to-earth rated voltage of 800 V DC or greater. An 800 V battery pack consists of about 200 cells that are connected in series. About 400 channels are needed to measure all cells’ voltage and temperature.

Additional modules may be added as the need to test more cells arises. Modules are sold separately.

Some applications of the LR8101 are shown below.

• Assessing cell charge/discharge characteristics
• Verifying cell balance
• Evaluating thermal management
• Detecting test system errors