Hioki Launches The Battery Cell Voltage Generator SS7081-50

Hioki Launches The Battery Cell Voltage Generator SS7081-50
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Hioki is launching the Battery Cell Voltage Generator SS7081-50 in March 2020. The SS7081-50 is a 12-channel generator and measuring instrument that can easily and accurately evaluate the performance of battery management systems (BMSs) used in lithium-ion battery packs1 found in electric vehicles (xEVs) and storage batteries (energy storage systems [ESSs] and uninterruptible power systems [UPSs]).

The transition to electric powertrains for vehicles is accelerating worldwide against the backdrop of resource constraints and environmental problems. Demand for LIB packs is growing along with the EV market, and R&D programs targeting associated technologies are accelerating. LIB packs incorporate a system board known as a BMS that monitors and optimally controls the battery. Control by BMS boards is particularly important because excessive discharge of LIBs poses serious hazards such as fire and electric shock.

As a simulated battery and voltage generator, the SS7081-50 facilitates performance and safety evaluation by making it possible to efficiently build an environment for testing parameters that would be difficult to reproduce with actual batteries, power supplies, or electronic loads. In addition, the instrument provides high-precision voltage and current measurement capability so that researchers and developers can evaluate increasingly sophisticated BMS functionality.

 

Key features include:

  1. Ability to efficiently build a testing environment by simulating batteries

The ST7081-50 can be used in place of an actual battery, power supply, or electronic load as a simulated battery/voltage generator and simulator. In addition, each SS7081-50 unit offers 12 channels. Multiple units, each capable of simulating 12 cells, can be connected together to create a multi-cell environment. This capability eliminates the cost of preparing numerous power supplies and electronic loads as well as the time that would be required to wire them together and fabricate large systems capable of controlling them.

  1. High-precision voltage and current measurement capability and support for measurement of minuscule currents

The SS7081-50 delivers high-precision voltage (±0.1% rdg. ±100 μV) and current (±0.07% rdg. ±100 μA) measurement capabilities to make possible more accurate evaluation of increasingly sophisticated BMS boards. It also provides a 100 μA (0.1 mA) minuscule current range that is ideal for measuring dark current2 and standby current3.

  1. Easy and safe simulation of wire breaks

The SS7081-50 can simulate wire breaks in the cable that connects the BMS to its battery. Use of actual batteries to evaluate BMS boards poses difficulties such as the need to fabricate specially designed test rigs and safety issues.

 

1 Lithium-ion battery packs are assembled batteries in which multiple cells are connected together.

2 Dark current refers to the current consumed while the BMS is powered off.

3 Standby current refers to the current consumed when the BMS is powered on but not operating.

 

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