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

25cm diameter; 50cm depth;
8 Heaters,
6 thermocouples (Three Zones, Bomb, Safety and Auxiliary)
60cm, 50cm depth

-50°C - 400°C EV temperature range
-40°C - 200°C BPC temperature range

0.02°C/min detection
Temperature resolution 0.001°C,
Precision <0.2%, Accuracy 0.7%

Pressure range 0-200 bar (or specify range to 1000 bar with alternative transducers), resolution 0.005bar, precision 0.02%, accuracy 0.05%


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

Workstation; flat screen monitor,
keyboard and mouse

Microsoft Windows, National Instruments
Labview control software ES-ARC
Labview; ARCes
Full on-the fly operation

Remote User facilities
Worldwide remote command & operation of ARC using Terminal Services worldwide broadcast of data and status with WebBrowser software

Virtual Technician facility
Set up unlimited runs and delay, sequence, perform all in one program

Data Analysis
Allowing: raw data graphs, time to maximum rate, thermokinetic modelling, time to explosion; data conversion to units of enthalpy, power, gas generation
Multiple dataset analysis; 9 datasets in 1 project; 3 analyses, multiple merge graphs report generation in Microsoft Word, or Microsoft Excel or html
Tutorial for instruction of analysis





KSU Option
To accomplished classic cycling tests for use, simulation and life cycle and efficiency and battery efficiency determination.


BSU Option
Abuse testing option (shorting, over voltage charging discharging application)

NPC Option
Automated mechanical abuse testing
(nail penetration, crush)

MP Option
Options allowing up to 24 thermocouples positioned on battery for variation over battery surface.

CPU Option
Specific heat capacity measurement

SSS Option
Gas collection during or after test into 50cm3 collection vessel

low cost add-ons designed to
facilitate testing in specific areas


Clamp & Collar Kit
– allowing appropriate connection to large
batteries to be subjected to high power
discharge and charge


Battery Safety Kit
– for those working with own cycler and abuse

Battery Pressure Kit
– allowing internal and external pressure
measurement. Includes canisters for gas
tight containment allowing pressure
measurement and gas collection



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.


Click here to request sample information

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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)
Sample Testing and Consultancy Services
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