Research on Direct Current Resistance
Research on Direct Current Resistance,
Research on Direct Current Resistance,
▍SIRIM Certification
For the security of person and property, Malaysia government establishes product certification scheme and puts surveillance on electronic appliances, information & multimedia and construction materials. Controlled products can be exported to Malaysia only after obtaining product certification certificate and labeling.
▍SIRIM QAS
SIRIM QAS, a wholly-owned subsidiary of the Malaysian Institute of Industry Standards, is the only designated certification unit of the Malaysian national regulatory agencies (KDPNHEP, SKMM, etc.).
The secondary battery certification is designated by KDPNHEP (Malaysian Ministry of Domestic Trade and Consumer Affairs) as the sole certification authority. Currently, manufacturers, importers and traders can apply for certification to SIRIM QAS and apply for the testing and certification of secondary batteries under the licensed certification mode.
▍SIRIM Certification- Secondary Battery
Secondary battery is currently subject to voluntary certification but it is going to be in the scope of mandatory certification soon. The exact mandatory date is subject to the official Malaysian announcement time. SIRIM QAS has already started accepting certification requests.
Secondary battery certification Standard : MS IEC 62133:2017 or IEC 62133:2012
▍Why MCM?
● Established a good technical exchange and information exchange channel with SIRIM QAS who assigned a specialist to handle with MCM projects and inquiries only and to share the latest precisely information of this area.
● SIRIM QAS recognizes MCM testing data so that samples can be tested in MCM instead of delivering to Malaysia.
● To provide one-stop service for Malaysian certification of batteries, adapters and mobile phones.
During charging and discharging of batteries, the capacity will be influenced by the overvoltage caused by internal resistance. As a critical parameter of battery, internal resistance is worth research for analyzing battery degradation. The internal resistance of a battery contains:Ohm internal resistance (RΩ) –The resistance from tabs, electrolyte, separator and other components.Charges transmission internal resistance (Rct) – The resistance of ions passing tabs and electrolyte. This represents the difficulty of tabs reaction. Normally we can increase the conductivity to reduce this resistance.Polarization Resistance (Rmt) is the internal resistance caused by density uneven of lithium ions between cathode and anode. Polarization Resistance will be higher in situations like charging in low temperature or high rated charge.Normally we measure the ACIR or DCIR. ACIR is the internal resistance measured in 1k Hz AC current. This internal resistance is also known as Ohm resistance. The shortage of the data is that it cannot directly show the performance of a battery. DCIR is measured by a forced constant current in a short time, in which the voltage continuously changes. If the instantaneous current is I, and the change of voltage in that short term is ΔＵ, according to Ohm law Ｒ＝ΔＵ／Ｉ We can get the DCIR. DCIR is not about only Ohm internal resistance, but also charge transfer resistance and polarization resistance.
