EV+Accelerating Rate Calorimeter

EV+ Accelerating Rate Calorimeter

Designed for EV cells and small modules and to fulfil requirements of US ABC & Freedom Car, SAND-2005-3123; SAE J2464 and other National and International prescribed tests

EV+Accelerating Rate Calorimeter

Many prescribed ‘standard’ tests call for Calorimetry and also call for use of abuse testing (eg SAND, SAE). Tests call for video monitoring, gas detection/analysis, nail penetration and crush under controlled conditions. The EV+ calorimeter from THT has been designed to accommodate many of these tests - and more whilst gaining quality information on heat release. 

EV+ Calorimeter from THT THT EV+ Calorimeter
The EV+ Calorimeter Inside the THT EV+ Calorimeter


The EV+ is an cylindrical calorimeter 40cm in diameter and 44cm depth. Unlike other THT adiabatic calorimeters the lid seals to the base unit. This seal is restricted to below 1 bar and is maintained by electromagnets. This allows for inertion of the environment and the ability to collect products of battery disintegration.

Standard Features of the EV+ calorimeter are:-

  • Integrated cables for current and voltage measurement
  • Video camera (with light)
  • Gas collection line (leading to gas collection bag)
  • Ability for battery pressure and temperature measurement
  • Ability for purging, evaluation, inerting


Hardware Features & Performance

EV+ Calorimeter

40cm diameter, 44cm depth
Side 6mm thick aluminium, Lid & Base 12mm thick aluminium, 8 heaters, 6 measuring, control and safety thermocouples
Thermocouple Resolution 0.001°C, Precision <0.2%, Accuracy 0.7%
Sealed lid designed for integral gas collection; safety release near 1 bar overpressure
Sealed lid pressure limit to 1 bar over pressure
Integrated high-current connectors (300A)
Integrated video monitor
Integrated inert gas purging facility
Pre-installed facilities for options

Temperature range
Ambient to 300°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 200°C

Pressure Range 0-14 bar (or specify higher range with alternative transducer)
Resolution 0.005bar, Precision 0.02%, Accuracy 0.05%

Control Modes
Adiabatic; Ramping, Isothermal modes, True Isothermal, Isoperibolic, Step Isothermal

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

Sample Holders
Special open or closed holders for any battery type.


Control Software
NI Labview based ARC-ES control software
Full on-the-fly change of test conditions
Full on-the fly system control
Ability to transfer operation of system to any allowed PC over network or internet
Virtual Technician facility - Set up multiple tests to automatically run successively.

Data Analysis Software
NI 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 data sets to a single plot

Operation / Ambient Environment

Electrical Specification
Single Phase Electrical Supply 100-250V, 32A 7kVA
Instrument conforms to CE, UL, VCCI, CSA standards

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


 specification above subject to change

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


Options for battery applications

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.

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

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 +EV

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

A testing service for larger battery cells is available. Tests include abuse and electro-thermal dynamics.

Abuse type testing will determine heat output when battery is shorted, overcharged or over-discharged.

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

We offer a full range of tests allowing all information on the safety, efficiency, lifetime of batteries and thermal consequences of their  performance to be determined.

Click here to request sample test 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)
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