Testing Data of Cell Thermal Runaway and Analysis of Gas Production
Testing Data of Cell Thermal Runaway and Analysis of Gas Production,
Analysis of Gas,
▍BSMI Introduction Introduction of BSMI certification
BSMI is short for Bureau of Standards, Metrology and Inspection, established in 1930 and called National Metrology Bureau at that time. It is the supreme inspection organization in Republic of China in charge of the work on national standards, metrology and product inspection etc. The inspection standards of electrical appliances in Taiwan are enacted by BSMI. Products are authorized to use BSMI marking on the conditions that they are in compliance with safety requirements, EMC testing and other related tests.
Electrical appliances and electronic products are tested according to the following three schemes: type-approved (T), registration of product certification(R) and declaration of conformity (D).
▍What is the standard of BSMI?
On 20 November 2013, it is announced by BSMI that from 1st, May 2014, 3C secondary lithium cell/battery, secondary lithium power bank and 3C battery charger are not permitted to access to Taiwan market until they are inspected and qualified according to the relevant standards (as shown in table below).
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Product Category for Test |
3C Secondary Lithium Battery with single cell or pack ( button shape excluded) |
3C Secondary Lithium Power Bank |
3C Battery Charger |
Remarks: CNS 15364 1999 version is valid to 30 April 2014. Cell, battery and Mobile only conduct capacity test by CNS14857-2 (2002 version).
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Test Standard |
CNS 15364 (1999 version) CNS 15364 (2002 version ) CNS 14587-2 (2002 version)
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CNS 15364 (1999 version) CNS 15364 (2002 version ) CNS 14336-1 (1999 version） CNS 13438 (1995 version) CNS 14857-2 (2002 version)
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CNS 14336-1 (1999 version) CNS 134408 (1993 version) CNS 13438 (1995 version)
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Inspection Model |
RPC Model II and Model III |
RPC Model II and Model III |
RPC Model II and Model III |
▍Why MCM?
● In 2014, rechargeable lithium battery became mandatory in Taiwan, and MCM began to provide the latest information about BSMI certification and the testing service for global clients, especially those from mainland China.
● High Rate of Pass: MCM has already help clients to obtained more than 1,000 BSMI certificates till now in one go.
● Bundled services: MCM helps clients successfully enter multiple markets in worldwide through one-stop bundled service of simple procedure.
The safety of energy storage system is a common concern. As one of the critical components of energy storage system, the safety of lithium-ion battery is particularly important. As thermal runaway test can directly evaluate the risk of fire occurring in energy storage system, many countries have developed corresponding test methods in their standards to assess the risk of thermal runaway. For example, IEC 62619 issued by the International Electrotechnical Commission (IEC) stipulates the propagation method to evaluate the influence of thermal runaway of the cell; Chinese national standard GB/T 36276 requires thermal runaway evaluation of the cell and thermal runaway test of the battery module; The U.S. Underwriters Laboratories (UL) publishes two standards, UL 1973 and UL 9540A, both of which assess thermal runaway effects. UL 9540A is specially designed to evaluate from four levels: cell, module, cabinet, and heat propagation at installation level. The results of thermal runaway test can not only evaluate the overall safety of the battery, but also allow us to quickly understand the thermal runaway of cells, and provide comparable parameters for the safety design of cells with similar chemistry. The following group of testing data for thermal runaway is for you to understand the characteristics of thermal runaway on each stage and the materials in the cell.
Stage 1: The temperature rises steadily with an external heating source. At this time, the heat production rate of the cell is 0℃/min (0~ T1), the cell itself does not heat, and there is no chemical reaction inside.
