New Methods of Triggering Thermal Run Away,
Run Away,

▍Vietnam MIC Certification

Circular 42/2016/TT-BTTTT stipulated that batteries installed in mobile phones, tablets and notebooks are not allowed to be exported to Vietnam unless  they are subjected to DoC certifctaion since Oct.1,2016. DoC will also be required to provide when applying Type Approval for end products (mobile phones, tablets and notebooks).

MIC released new Circular 04/2018/TT-BTTTT in May,2018 which stipulates that no more IEC 62133:2012 report issued by overseas accredited laboratory is accepted in July 1, 2018. Local test is necessity while applying for ADoC certificate.

▍Testing Standard

QCVN101：2016/BTTTT（refer to IEC 62133：2012)

▍PQIR

The Vietnamese government issued a new decree No. 74/2018 / ND-CP on May 15, 2018 to stipulate that two types of products imported into Vietnam are subject to PQIR (Product Quality Inspection Registration) application when being imported to Vietnam.

Based on this law, the Ministry of Information and Communication (MIC) of Vietnam issued the official document 2305/BTTTT-CVT on July 1, 2018, stipulating that the products under its control (including batteries) must be applied for PQIR when being imported into Vietnam. SDoC shall be submitted to complete the customs clearance process. The official date of entry into force of this regulation is August 10, 2018. PQIR is applicable to a single import to Vietnam, that is, every time an importer imports goods, he shall apply for PQIR (batch inspection) + SDoC.

However, for importers who are urgent to import goods without SDOC, VNTA will temporarily verify PQIR and facilitate customs clearance. But importers need to submit SDoC to VNTA to complete the entire customs clearance process within 15 working days after customs clearance. (VNTA will no longer issue the previous ADOC which is only applicable to Vietnam Local Manufacturers)

▍Why MCM?

● Sharer of Latest Information

● Co-founder of Quacert battery testing laboratory 

MCM thus becomes the sole agent of this lab in Mainland China, Hong Kong, Macau and Taiwan.

● One-stop Agency Service

MCM, an ideal one-stop agency, provides testing, certification and agent service for clients.

With more accident caused by lithium-ion battery happens, People are more concerned about battery thermal run away, as the thermal run away occurring in one cell may spread heat to other cells, leading to shut-down of the whole battery system.
Traditionally we will trigger thermal run away by heating, pinning or overcharging during tests. However, these methods can neither control thermal runaway in a specified cell, nor can they easily be implemented during tests of battery systems. Recently people are developing new method to trigger thermal runaway. The Propagation test in new IEC 62619: 2022 is an example, and it is estimated that this method will be a wide use in the future. This article is to introduce some new methods that are under research.
Laser radiation is to heat a small area with high energy laser pulse. The heat will be conducted inside the material. Laser radiation is widely used in the areas of material processing, like welding, connecting and cutting. Commonly there are kinds of laser as follows:
Having a CT scan on the not triggered cell, it can be found that there’s no structural influence except for the hole on the surface. It means laser is directional, and high-power, and the heating area is precise. Therefore laser is a good way for testing. We can control the variable, and calculate the input and output energy accurately. Meanwhile laser has the advantages of heating and pinning, like fast heating, and more controllable. Laser has more advantages like: