GB 4943.1 Battery Test Methods,
GB 4943.1-2022,

▍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 1^st, 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).

▍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.

In the previous journals, we’ve mentioned some of devices and components testing requirements in GB 4943.1-2022. With the increasing use of battery-powered electronic devices, the new version of GB 4943.1-2022 adds new requirements based on 4.3.8 of the old version standard, and the relevant requirements are put into Appendix M. The new version has more comprehensive consideration on devices with batteries and protection circuits. Based on the evaluation of battery protection circuit, additional safety protection from devices are also required.A: Yes. GB 31241 and GB 4943.1 Appendix M cannot replace each other. Both standards should be met. GB 31241 is for the battery safety performance, regardless of the situation on the device. Annex M of GB 4943.1 verifies the safety performance of batteries in devices.A: It is not recommended, because in general, M.3, M.4, and M.6 listed in Annex M need to be tested with a host. Only M.5 can be tested with battery separately. For M.3 and M.6 which require battery own a protection circuit and need to be tested under single fault, if the battery itself contains only one protection and no redundant components and the other protection is provided by the whole device, or the battery does not have its own protection circuit and the protection circuit is provided by the device, then it is the host to be tested..Q: Is grade V0 required for battery fire protection external case?
A: If the secondary lithium battery is provided with a fire protection external case of no less than Grade V-1, which meets the test requirements of M.4.3 and Annex M. It is also considered to meet the PIS isolation requirements of 6.4.8.4 if the distance is insufficient. Therefore it is not necessary to have a fire protection external case of level V-0 or conduct additional tests as Annex S.