EV-Accelerating Rate Calorimeter

EV-Accelerating Rate Calorimeter

To implement all of the tests with larger batteries, which can be carried out with small batteries using the esARC, THT developed the original EV-ARC in 1999.

EV-Accelerating Rate Calorimeter

The EV calorimeter is necessary for larger batteries, modules and small packs, power tools, satellite, military and associated applications. The EV calorimeter is used when variation of heat release over surface area (MultiPoint measurement) is to measured and associated thermal management applications. The EV 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 EV system all safety tests can be carried out as well as Battery Performance studies.

The BPC Battery Performance Calorimeter is an even larger calorimeter where thermal management is to be studied - it is not suitable for safety tests, but is used for multipoint and power discharge application and experimentation over environmental temperatures. It is restricted to 200°C.


Over-voltage test from ambient temperature


Hardware Features & Performance

EV Calorimeter
25cm diameter; 50cm 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 450°C temperature range
(-40°C with liquid nitrogen flow option LNF)

Sensitivity (applicable to new calorimeters only)
Potential to achieve 0.02°C/min to 300°C

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.

0.57 cubic meter containment vessel (Blast Box);
6mm 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.

Customer Support

Installation & training - 1 week, acceptance test

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

Part Supply
10 years guaranteed

Full operations and data analysis
manuals with tutorials


Software & Computing Power

Control Software
National Instruments Labview based ARC-ES Control Software 
Full on-the-fly change of test conditions
Full on-the fly operation

Remote User facilities
Ability to transfer operation on system to any allowed PC over network or internet

Virtual Technician facility
Set up multiple tests in one method

Data Analysis Software
National Instruments Labview based ARCCAL+ analysis software
Features include: Graphical and tabulation of raw data including Phi Corrected TMR plots
Data Conversion to Enthalpy, Power, Gas Generation     
Kinetic Modelling for thermodynamic and kinetic data analysis
Phi Correction through kinetic modelling
Report generation in Microsoft Word, Excel, HTML
Analysis of 9 concurrent data sets; 3 analyses on each data set, merge all datasets to a single plot.

Operation / Ambient Environment

Environmental Requirements
Temperature 5-45°C, Humidity 0-95%
Air supply (Optional for rapid cooling post test)
Water (needed only for CSU)

Electrical Specification
Single Phase Electrical Supply 100-250V, 16A 3.5kW
Instrument conforms to CE, UL, VCCI, CSA standards



Options fpr battery applicaitons

CPU Option
Automatic Specific Heat Measurement up to 120°C

SSS Option
Gas collection during or after test into collection vessel, up to 4 litre sample

KSU Option
Single Channel Battery Cycler – Customer specified voltage and vurrent range

SCO Option
Button operated electronic contactor and high-current cables for external short circuiting of batteries under adiabatic conditions. Optional current transducer for shorting current measurement.

NPC Option
Automated Mechanical Abuse testing (Nail Penetration, Crush) up to 34kN force

MPO Option
Multipoint thermocouple for spatial distribution measurement

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

Kits: Low cost add-ons designed to facilitate testing in specific fields

Battery Safety Kit
For those working with own cycler and abuse tester +EV

Battery Abuse and Pressure Kit
Hardware add-ons to allow simulation of abuse tests


Click here view downloads


A full range of spares and consumables are available from our eshop arcspares.com

Low Φ containers
Designed by THT these low Φ containers are designed to enable accelerating rate calorimeter users to bridge the gap into the world of low-phi testing. These cells are available with several different fittings and can also be fitted with magnetic stir bars. Currently these containers are offered in stainless steel although other materials can be produced. Contact us for further details.

Burst Disk Unit
THT has designed this burst disk assembly, which is suitable for any
accelerating rate calorimeter. Designed to sit above the calorimeter, this device enables the user to protect the system from cell ruptures. The user can fit a number of special burst disks which are designed to rupture at specific pressures and will cause the cell to rapidly discharge. Any liquid vented will be contained within the catch pot. This system is ideally used alongside low-phi containers and glass bombs

Battery sample holders
THT manufactures holders for specific batteries to enable testing in both open and closed (with pressure connections) modes. THT are able to manufacture special holders for any battery dependent on a specified minimum order. Please contact us with your specific requirements.

Sample Holders
Specific holders for all battery types.

2 cubic meter containment vessel (Blast Box) to allow working space; 3mm reinforced Steel, Proximity Switch, Door bolt;
Burst Disk Assembly. Automated Fume Extraction facility

Control Modes
Adiabatic; Quasi-Isothermal, True Isothermal, Isoperibolic, RampDetection of Endotherms and Tracking of Exotherms


Sample Testing Service

For larger battery cells the EV-ARC can be used. A testing service including abuse and electro-thermal dynamics is available.

Abuse type testing will determine heat output when battery is shorted, overcharged or over-discharged. Such tests are routinely carried out in the THT ARC using the BSU option.

Testing can also be carried out to determine Cp variation of heat release over surface area (multi-point) and aspects of thermal management.

The full range of tests that can be carried out with the EV-ARC plus battery test options allows all information on the safety, efficiency, lifetime of batteries and thermal consequences of their  performance to be determined.


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I'm interested in the following services

ES-Accelerating Rate Calorimeter (ES-ARC)
EV-Accelerating Rate Calorimeter (EV-ARC)
EV+Accelerating Rate Calorimeter (EV+ARC)
Battery Performance Calorimeter (BPC)
Rapid Screening Device (RSD)
Isothermal Battery Calorimeter (IBC)
Micro Reaction Calorimeter (µRC)
Ultra Stable Isothermal Calorimeter (UIC)
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