To implement tests with larger batteries THT have developed the EVx ARC

The EVx calorimeter is necessary for larger batteries, modules and small packs, power tools, satellite, military and associated applications. The EVx calorimeter is rugged and is sited in a secure containment vessel.

Within the containment vessel the standard ARC calorimeter (as in ES-ARC) can be used and this is regularly supplied for "Double Systems". Such a system gives versatility capable of measuring:- small prismatic, coin cell, 18650 and other larger batteries used in power applications.

With the EVx system all safety tests can be carried out as well as Battery Performance studies.

Standard Feature of the EV-X Accelerating Rate Calorimeter:

• The EVx is an cylindrical calorimeter 25cm in diameter and 60cm depth.
• Utilises the same electronics and software as the standard esARC, but with a larger calorimeter suitable for testing 18650 to large prismatic cells.
• A larger and stronger blast box / containment vessel is supplied with built-in fume extraction.
• The size of the containment vessel allows extra space for the incorporation of many options including heat capacity, multipoint option
• for spatial temperature measurements, gas collection and controlled speed nail penetration.

Specification

Hardware Features & Performance

EVx Calorimeter

• 25cm diameter; 60cm depth;
• 20mm thick aluminium, 8 heaters, 6 measuring, control and safety thermocouples
• Thermocouple resolution 0.001°C, Precision <0.2%, Accuracy 0.7%
• Adiabatic Control to 0.01°C
• Collar for large cable ingress
• Pre-installed facilities for options

Temperature range

• Ambient to 350°C temperature range (-40°C with liquid nitrogen flow option LNF)

Sensitivity (applicable to new calorimeters only)

• 0.05°C/min
• Potential to achieve 0.02°C/min to 300°C

Pressure

• Pressure range 0-200 bar (or specify range to 700 bar with alternative transducers)
• Resolution 0.005bar, Precision 0.02%, Accuracy 0.05%

Control Modes

• Adiabatic; Ramping, Isothermal modes, True Isothermal, Isoperibolic, Step Isothermal.

Safety

• 1.93 cubic meter containment vessel (Blast Box);
• 3mm reinforced Steel, Proximity Switch, Door interlock;
• Automated Fume Extraction facility

Sample Holders

• Hastelloy, titanium, stainless steel, aluminium, glass, ARC bombs (9cm3), low phi bombs (65cm3) tube bombs (1cm3) special open or closed holders for any battery type.

Comparison of calorimeter
 

Customer Support

Installation & training 1 week, acceptance test

Support Guarantee 1 year, phone and email support over lifetime of instrument without charge

Part Supply 10 years guaranteed

Manuals Full operations and data analysis, manuals with tutorials

Options for battery applications

CPU Automatic Specific Heat Measurement up to 120°C

FHU Air-shield mounted on inner blast box to provide improved extraction 

KSU Single Channel Battery Cycler – Customer specified voltage and current range

LNFO Liquid nitrogen flow for low temperature application, to -40°C start temperature

MPO Multipoint thermocouple for spatial distribution measurement

NPCO Automated Mechanical Abuse test
ing (Nail Penetration, Crush) up to 34kN force

NPCO-CS Automated Mechanical Abuse testing (Nail Penetration, Crush) up to 34kN force

RHA Switch operated lid lifting mechansim for EV and EV+

SSU Gas collection, 4 samples – automatic collection at any time, temp, pressure, 500ml collection vessel