January 2019 Newsletter Battery Applications Latest developments at THT We are proud to reveal our new logo. The old logo had been used since THT’s foundation, after 24 years it’s time for a change! To coincide with the new look our ARC Battery brochure has been updated. The brochure features the ES, EV and EV+ ARC systems, helping customers select the appropriate calorimeters and options for their needs. Copies can be requested via the sales office; a PDF version is also available for download. In the upcoming months, we will update our other marketing literature and online presence. THT is thankful to Bluecube Creative for designing the logo and brochure.
High demand for our products continues. THT welcomes Production Electronic Engineers, Melvin Thomas and Hasan Mannan. Their addition satisfies customer demands, strengthening our commissioning & service department.
Melvin Thomas
Hasan Mannan
In line with the continued growth and expansion of the business, 2019 will see an extension of our UK headquarters. Situated on the same site as our existing facility, but now occupying both North House and South House more space will be added to lab and production areas. Following a recent independent assessment, we are delighted to announce that once again we have gained ISO9001 certification for quality management.
January 2019 Newsletter Battery Applications ARC Measure the total heat from battery disintegration With a simple modification to test protocols it is possible to record total heat during battery disintegration. Determining the heat of explosive decomposition of batteries is valuable for safe pack design. To do this in the THT ARC the battery is housed in a pressure tight canister sealed with electrical connections to allow for overcharge/short-circuiting. The ARC ‘bomb thermocouple’ is attached to the battery canister. Auxiliary thermocouples measure the battery temperature and internal gas temperature. Cell voltage may also be monitored to provide information about the condition of the cell throughout the test.
Panasonic NCR18650B Thermal Runaway 900
Cell temp rise = max temp - onset temp = 882 - 100 = 782oC
35
700
Canister temp rise = max can temp - initial can temp = 270 - 165 = 105oC
30
600 500 400 300
Range of canisters from 0.4L to 22L for coin cell to pouch & prismatic cells
40
Heat of Reaction of 18650 cell
800
25
Cell thermal energy adsorbed = cell temp rise x cell Cp x cell mass = 782 x 0.9 x 45 = 31671J
20
Canister thermal energy adsorbed = can temp rise x can Cp x can mass = 105 x 0.5 x 700 = 36750J
15 10
Total energy released = total thermal energy adsorbed = 31671 + 36750 = 68421J or
68.42KJ
200 100 300
320
5
340
360
380
0 400
Time
Canister
Cell
Atmosphere
Pressure
Canister, battery and atmosphere temperatures are all recorded. From the temperature rise of the battery and the canister, the total heat release is determined. This is illustrated in the Figure above. Knowing the mass and specific heat of the battery and the canister and the temperature rise of both, and combining these, the total heat release is measured. The adiabatic control of the canister prevents heat loss or gain during the test.
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January 2019 Newsletter Battery Applications ARC Battery Webinar: Advanced Techniques For Addressing Issues in Battery Safety and Performance Using Adiabatic Calorimetry. November saw another successful online seminar in conjunction with PlugVolt. The presentation was given by THT’s Technical Performance Manager. Danny Montgomery described both the advantages and limitations of ARC testing on batteries and how the ARC test can be adapted to address different questions in battery research as well as quality control.
Calorimeter Centre at KIT Karlsruhe Institute of Technology (KIT) have produced a new brochure showcasing their Calorimetry Centre within the Institute of Applied Materials. The brochure highlights the benefits of battery calorimetry and the importance of safe batteries. Download the brochure here.
This webinar attracted 200 registrations from 5 different continents, focusing on the following key topics: • The principles of adiabatic calorimetry (ARC) • How calorimetry can be used in battery testing • What we learn from battery testing by calorimetry • Pressure measurement and gas collection during thermal runaway • Advanced testing techniques in adiabatic battery calorimetry A recording of the webinar is now available. View it by registering your details at the PlugVolt website.
ARC testing of large, high capacity batteries The EV+ has successfully been proven to safely test a 153Ah NMC prismatic cell. This represents the highest capacity cell tested at THT. A standard open heat-wait-seek (HWS) test with adiabatic tracking was run with voltage monitoring and multiple temperature (multipoint) readings. The calorimeter performed as expected and suffered no damage from the full decomposition of this high energy cell. Download the Technical Application Note.
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Exhibitions October saw THT attend AABC Asia (Advanced Automotive Battery Conference) in Osaka, Japan. We were joined on the booth by our Japanese and Chinese representatives Naonori Ito and Harry Li.
During 2019 THT will be exhibiting at the following events. In addition we are proud to sponsor a special session on advanced calorimetric techniques for investigating LIB safety during ECS, Dallas 29-31 January AABC-Europe Strasbourg Convention & Exhibition Centre, France 25-28 March International Battery Seminar Fort Lauderdale, USA 28 March Battery Tech Expo Telford, UK
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2-4 April Battery Power 2019 Eurogress Aachen, Germany
During January THT India exhibited at iSAEST, International Symposium on Advances in Electrochemical Sciences and Technology, Chennai. The successful exhibition and conference was organised in partnership with CSIR, Central Electrochemical Research Institute.
26-31 May ECS Dallas, Texas 10-12 September Battery Show 2019, Novi, USA
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China Office Thermal Safety Technology t: +86 21 6114 0501 e: info@thermalsafetytechnology.com