Introduction on Heat Dissipation Technology of Energy Storage Battery,
Energy storage battery,

▍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.

Battery thermal dissipation technology, also called cooling technology, is essentially a heat exchange process that reduces the internal temperature of the battery by transferring heat from the battery to the external environment through a cooling medium.it is currently used on a large scale in traction batteries, as well as energy storage batteries, especially those of container ESS. Li-ion batteries are as sensitive to temperature as chemical reaction catalysts in the actual usage. Therefore the purpose of heat dissipation is to provide an appropriate working temperature for the battery. When the temperature of Li-ion battery is too high, a series of side reactions such as decomposition of solid electrolyte interface film (SEI film) will occur inside the battery, which greatly affects the battery life cycle. However, when the temperature is too low, the performance of the battery will age faster and there exist a risk of lithium precipitation, which lead to a rapidly reduced discharging capacity and a limited performance in cold areas. What’s more, the temperature difference between the single cells in the module is also a factor that should not be ignored. Temperature difference beyond a certain range will lead to unbalanced internal charging and discharging, resulting in capacity deviation. In addition, the temperature difference will also lead to an increase in the heat generation rate of the cells near the load point, leading to battery failure.In some medium and high rate products, due to the high charging and discharging current, the heat inside the module cannot be dissipated quickly and effectively by natural cooling alone, as it will easily cause the heat accumulation inside and affect the cycle life of the cells. Therefore, the forced air cooling method is more suitable for the application scenario of medium and high rate energy storage products.