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

Calorimeter Assembly

  • Circular, aluminium, 10mm wall thickness
  • 40cm diameter
  • 44cm deep
  • 3 zones heating ARC™ design principle and operation. Calorimeter lid port seals to base port giving a pressure tight seal at this point.
  • Pressure integrity of calorimeter assembly: Release pressure 20 psi/1.5 bar absolute
  • 0.5 bar overpressure, sealed for gas collection and safety purposes.

Temperature range
-50°C (with CryoCool) to +300°C

Temperature measurement
Type N thermocouple

Temperature sensitivity

Temperature accuracy

Exotherm detection sensitivity

Exotherm tracking rate
to 15°C/min

Pressure measurement
external (standard)
internal  (optional)

Pressure range
0-50 bar

Pressure accuracy

Standard Features

Inerting/Evacuation/Gas Purging (cooling)
► Ability to purge to work in inert gas or under vacuum and to add gas for cooling or gas transfer. Pressure tight ports

Battery Connector (Current and voltage)
► 100kW copper bar through calorimeter for current feeds. Insulated and thermally guarded (to minimise heat loss during operation). Pressure tight ports. Two pressure tight ports for VOLTAGE measurement (smaller insulated cables).

Gas Collection Port
► One 50mm pressure sealed port. Outlet for FEP gas collection bag or with customer modification for either single shot gas collection or continuous flow analysis.
Provided as standard for basic system with 50 litre FEP bag.

Video Monitoring
► Pressure tight glass window in calorimeter. Includes video camera and data link to PC for data collection.

Electro-magnetic Sealed Lid
► Pressure tight to allow seal with safe pressure release.

Automated Electronic Cut Out
► In addition to Software & Hardware. Safety features an electronic switch off feature gives additional safe in use operation.


 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



Sub Ambient Operation, Cryogenic Option
Pressure tight ports provided in calorimeter that can be blanked off or used for cryogenic cooling to -50°C using liquid nitrogen flow option (LNFO).

Heat Capacity Measurement Cp
Pressure tight ports provided in calorimeter that can be blanked off or used with Heat Capacity Option (CPO).

Surface Temperature Distribution
(Multipoint Option)

Pressure tight ports provided in calorimeter which can be blanked off or used with either the 8 thermocouple, 16 thermocouple or 24 thermocouple Multipoint Option (MPO).

Controlled Speed Nail Penetration
& Crush Option

Pressure tight ports provided in calorimeter which can be blanked off or used with the NP option. The latest THT Nail Penetration option allows functionality to SAND 2005-3123 & SAE J2464 specification. (EC-CS-NPCO). The NP option is pressure tight to the calorimeter (it allows in operation in-situ gas collection and video monitoring). The NP option allows for nail penetration at controlled speed up to 20cm/sec and crush.

Gas Analysis Options
THT can supply a range of collection vessels for gas analysis (GC or MS)



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

Request Information

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)
Micro Muticell Calorimeter (µMC)
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