Is the lithium iron phosphate cell safe under overcharge conditions?,
Lithium,

▍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.

According to previous statistics, 80% of spontaneous combustion accidents of new energy vehicles occur
during charging or one hour after being fully charged. Among the many reasons for the fire and explosion of lithium batteries, overcharging is one of the most important.
The lithium iron phosphate battery is recognized by the industry as a battery with high safety. In order to
verify the safety of its overcharge, the editor chooses a lithium battery to perform an overcharge test to see if it is true.
Overcharge TestingThe Lithium iron phosphate cell used in the tested is 3.2V/100Ah with aluminum enclosure. To maximize overcharge state of the cell as much as possible, we have already used 2 times the nominal voltage(6.4V) as charging voltage and 2C as charging current.
1. Connect the battery cell to a regulated DC power supply or charging and discharging equipment;
2. Paste the thermocouple wire in the center of the cell and near the positive and negative terminals to
monitor the surface temperature of the cell in real time.