A detailed explanation of the forced internal short circuit test of lithium ion cell,
TISI,

▍What is TISI Certification?

TISI is short for Thai Industrial Standards Institute, affiliating to Thailand Industry Department. TISI is responsible for formulating the domestic standards as well as participating in international standards formulation and supervising the products and qualified assessment procedure to ensure the standard compliance and recognition. TISI is a governmental authorized regulatory organization for compulsory certification in Thailand. It is also responsible for formation and management of standards, lab approval, personnel training and product registration. It is noted that there is no non-governmental compulsory certification body in Thailand.

There is voluntary and compulsory certification in Thailand. TISI logos (see Figures 1 and 2) are allowed to use when products meet the standards. For products that have not yet been standardized, TISI also implements product registration as a temporary means of certification.

▍Compulsory Certification Scope

The compulsory certification covers 107 categories, 10 fields, including: electrical equipment, accessories, medical equipment, construction materials, consumer goods, vehicles, PVC pipes, LPG gas containers and agricultural products. Products beyond this scope are fall within the voluntary certification scope. Battery is compulsory certification product in TISI certification.

Applied standard: TIS 2217-2548 (2005)

Applied batteries：Secondary cells and batteries(containing alkaline or other non-acid electrolytes – safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications)

License issuance authority:  Thai Industrial Standards Institute

▍Why MCM?

● MCM cooperates with factory audit organizations, laboratory and TISI directly, capable to provide best certification solution for clients.

● MCM possesses 10 years abundant experience in battery industry, capable to provide professional technical support.

● MCM provides one-stop bundle service to help clients enter into multiple markets (not only Thailand included) successfully with simple procedure.

Test Purpose: to simulate the short circuit of the positive and negative electrodes, scrap particle and other impurities that may enter the cell during the manufacturing process. In 2004, a laptop battery produced by a Japanese company caught fire. After detailed analysis of the cause of the battery fire, it is believed that the lithium ion battery was mixed with very small metal particles during the production process, and the battery was used due to temperature changes. Or various impacts, metal particles pierce the separator between the positive and negative electrodes, causing a short circuit inside the battery, causing a large amount of heat to cause the battery to catch fire. Since the mixing of metal particles in the production process is an accident, it is difficult to completely prevent this from happening. Therefore, an attempt is made to simulate the internal short circuit caused by the metal particles piercing the diaphragm through the “forced internal short circuit test”. If the lithium ion battery can ensure that no fire occurs during the test, it can effectively ensure that even if the battery is mixed in the production process Test object: cell (except the cell of non-liquid electrolytic liquid system). Destructive experiments show that the use of solid lithium ion batteries has a high safety performance. After destructive experiments such as nail penetration, heating (200℃), short circuit and overcharge (600%), liquid electrolyte lithium-ion batteries will leak and explode. In addition to the slight increase in internal temperature (<20°C), the solid-state battery does not have any other safety issues. Test Method (see PSE Appendix 9)