The iso-BTC and iso-BTC+ from H.E.L Group are isothermal battery calorimeters designed to characterise the thermal behaviour and electrical performance of battery cells under normal and extended operating conditions.
Both systems support the integration of charge-discharge cycling, allowing battery cells to be repeatedly cycled under different conditions while simultaneously recording electrical performance and heat generation. This enables investigation of battery efficiency, ageing, cell chemistry and electrode composition.
The iso-BTC is a bench-top system suitable for small to medium-sized cells, while the floor-standing iso-BTC+ accommodates larger cell formats and higher capacities, offering higher sensitivity, greater measurable power and advanced thermal mapping.
Features and Options
iso-BTC and iso-BTC+ Comparison
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| iso-BTC |
iso-BTC+ |
Image Credit: H.E.L Group
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Feature
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iso-BTC
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iso-BTC+
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Configuration
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Bench-top
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Floor-standing
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Battery formats
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Coin, cylindrical, small prismatic and pouch cells
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Cylindrical, prismatic and pouch cells, including larger formats
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Test chamber (W × D)
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255 × 275 mm
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350 × 350 mm
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Maximum measurable power
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60 W standard, 100 W optional
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200 W (2 × 100 W zones)
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Thermal sensitivity
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Standard
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Higher sensitivity
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Thermal mapping
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Optional
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Advanced multipoint thermal mapping
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The following features and options are available on both systems, unless otherwise specified.
Type of Test
- Battery performance under normal and extended operating conditions.
- Ageing and lifetime performance testing.
- Battery behaviour as a function of charge-discharge rate and temperature:
- Heat release profiles.
- Battery efficiency profiles.
- Battery charge-discharge capacity profiles.
Battery/Sample Size
- Suitable for coin cells, cylindrical cells, small prismatic cells and small pouch cells.
- Testing chamber dimensions: 255 × 275 mm (width × depth).
- Battery adaptors available for 18650, 26650 and 21700 cylindrical cells.
- Custom battery adaptors available upon request.
Temperature Control
- Standard operating temperature range from −20°C to 90°C on both systems.
- Optional temperatures starting from −40°C on iso-BTC.
Intelligent Software Control and Analysis
- H.E.L's WinISO software provides automated data logging, multi-step experimental procedures, parameter control and real-time monitoring.
- Optional integration with battery cyclers allows simultaneous recording of electrical and thermal performance.
- Data acquisition rates up to 10 Hz on both systems.
Safety Features
- Automated shutdown procedures if safety limits are exceeded.
- Nitrogen purging when operating under sub-ambient conditions.
- Multipoint sample temperature measurement where thermal mapping is fitted.
- Hardware and software safety monitoring.