The Agilent/Keysight BT2191A is a single-channel self-discharge measurement system for rapid characterization of lithium-ion cells. It compresses evaluation timelines from weeks or months to hours, using potentiostatic measurement techniques that minimize disturbance to the cell under test. Designed for cell designers and engineers requiring accurate DC self-discharge assessment across cylindrical and pouch cell formats.
Technical Specifications
Measurement Capabilities
• Self-discharge current and cell voltage measurement
• Potentiostatic measurement method
• Current accuracy: ±(0.025% + 100 nA) for ≤1 mA; ±(0.025% + 10 µA) for ≤10 mA
• Cell voltage accuracy: 0.0016% up to 4.5 V
• Source voltage stability: ±10 µVpk (typical)
• Cell voltage matching: ±5 µV to actual cell voltage
Measurement Duration
• Cylindrical cells (18650, 21700): 30 minutes to 2 hours
• Larger pouch cells (10–60 Ah): 1 to 4 hours
Temperature Monitoring
Cell temperature measurement enables analysis of voltage and self-discharge current variation with thermal conditions. Supported sensors include T-type thermocouple (supplied), J, K, E, N, R-type thermocouples, 5 kΩ thermistor, Pt100 and Pt1000 RTDs.
– Key Features
• One channel configuration suitable for sequential or single-cell evaluation
• Ethernet connectivity for instrument and PC integration via network switch
• Software includes graphing, data logging, Excel export (.xlsx), and instrument configuration utilities
• Matching function for rapid self-discharge measurement acquisition
• Spring-loaded electrical clips with labeled connections for fast setup
• Approximate 2-meter cable separation between cell and instruments via BT2191-60001 wiring harness
• Operates in standard ambient room temperature environment
– Typical Applications
Lithium-ion cell validation, self-discharge rate determination, temperature-dependent performance analysis, and design verification for portable electronics, energy storage, and automotive battery applications.
– Compatibility & Integration
Requires host PC/System Controller, Ethernet switch, and five Ethernet cables. Compatible with Keysight N6705A/B/C DC Power Analyzers with specific firmware revisions. System typically ships with instruments and wiring harness individually boxed in one large container.
