Stepped heating tests for Ternary li-cell and LFP cell
Stepped heating tests for Ternary li-cell and LFP cell,
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▍Compulsory Registration Scheme (CRS)
Ministry of Electronics & Information Technology released Electronics & Information Technology Goods-Requirement for Compulsory Registration Order I-Notified on 7th September, 2012, and it came into effect on 3rd October, 2013. Electronics &Information Technology Goods Requirement for Compulsory Registration, what is usually called BIS certification, is actually called CRS registration/certification. All electronic products in the compulsory registration product catalog imported to India or sold in the Indian market must be registered in the Bureau of Indian Standards (BIS). In November 2014, 15 kinds of compulsory registered products were added. New categories include: mobile phones, batteries, power banks, power supplies, LED lights and sales terminals, etc.
▍BIS Battery Test Standard
Nickel system cell/battery: IS 16046 (Part 1): 2018/ IEC62133-1: 2017
Lithium system cell/battery: IS 16046 (Part 2): 2018/ IEC62133-2: 2017
Coin cell/battery is included in CRS.
▍Why MCM?
● We have been focused on Indian certification for more than 5 years and helped client obtain the world’s first battery BIS letter. And we have practical experiences and solid resource accumulation in BIS certification field.
● Former senior officers of Bureau of Indian Standards (BIS) are employed as certification consultant, to ensure case efficiency and remove the risk of registration number cancellation.
● Equipped with strong comprehensive problem solving skills in certification, we integrate indigenous resources in India. MCM keeps good communication with BIS authorities to provide clients with the most cutting-edge, most professional and most authoritative certification information and service.
● We serve leading companies in various industries and earn a good reputation in the field, which make us deeply trusted and supported by clients.
In the new energy automobile industry, ternary lithium batteries and lithium iron phosphate batteries have always been the focus of discussion. Both have their advantages and disadvantages. The ternary lithium battery has high energy density, good low-temperature performance, and high cruising range, but the price is expensive and not stable. LFP is cheap, stable, and has good high-temperature performance. The disadvantages are poor low-temperature performance and low energy density.
In the development process of the two batteries, due to different policies and development needs, twotypes play against each other up and down. But no matter how the two types develop, the safety
performance is the key element. Lithium-ion batteries are mainly composed of negative electrode material, electrolyte and positive electrode material. The chemical activity of the negative electrode material graphite is close to that of metallic lithium in the charged state. The SEI film on the surface decomposes at high temperatures, and the lithium ions embedded in the graphite react with the electrolyte and the binder polyvinylidene fluoride to release a lot of heat. Alkyl carbonate organic solutions are commonly used as
electrolytes, which are flammable. The positive electrode material is usually a transition metal oxide, which has a strong oxidizing property in the charged state, and is easily decomposed to release oxygen at high temperature. The released oxygen undergoes an oxidation reaction with the electrolyte, and then releases a large amount of heat.
Therefore, from the point of view of materials, lithium-ion batteries have a strong risk, especially in the case of abuse, safety issues are more prominent. In order to simulate and compare the performance of two different lithium-ion batteries under high temperature conditions, we conducted the following stepped heating test.
