According to media reports today, Amoi's lithium-ion battery model No. 4+3.7V1150mAh failed in the 150°C thermal shock test. After interviewing Xia Xin, the reporter learned the following relevant situations.
It is understood that the standard used in this sampling test is GB/T 18287-2000 "General Specification for Cellular Lithium Ion Battery" promulgated in 2000. Since the mobile phone is generally used in nickel-hydrogen battery and nickel-cadmium battery, lithium-ion battery It has not been widely adopted, so the main test clauses for the development of lithium-ion battery standards are directly extended to nickel-metal hydride batteries and nickel-cadmium batteries, including the "thermal shock test temperature standard of 150 ° C, for 30 minutes."
In the past two years, as the functions of mobile phones have become more and more powerful, the requirements for battery capacity have become larger and larger. The industry has begun to adopt lithium-ion batteries with larger capacity and longer life. But so far, the relevant state departments have not issued new national testing standards for lithium-ion batteries. The use of 150 ° C as the thermal shock temperature standard for lithium batteries has been causing controversy. This is mainly because the lithium battery capacity in China's mobile phone market is very small in 2000, and the energy density is low. The standard of 150 °C is no problem, but with the continuous development of multi-functional mobile phones and the user's demand for standby time, mobile phone batteries The larger the capacity, the larger the capacity of the battery can not withstand the 150 ° C standard, especially the large capacity battery of more than 1000 mA can only pass the 130 ° C test, so the industry has been controversial for 150 ° C or 130 ° C standards for many years.
In 2003, the Ministry of Information Industry released the implementation of YD1268-2003 "Safety Requirements and Test Methods for Lithium Batteries and Chargers for Mobile Communication Handsets", in which the temperature standard for thermal shock tests has been changed to 130 °C, which has become a common test in the mobile phone industry. In September 2005, the National Standard Revision Conference chaired by the General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Technical Committee for Alkaline Storage Battery proposed a revised version of the new national standard, in which the temperature standard for thermal shock testing was also changed to 130. °C, but for various reasons, the new national standard promulgated in September 2005 is expected to be delayed. It is worth noting that since 2004, in the international electronic product certification standards such as UL and CE, the standard temperature of the thermal shock test has also been changed to 130 °C.
In the interview, Amoi specifically stated that the lithium-ion battery purchased by Amoi was strictly inspected according to the above-mentioned industry standard, and all qualified in the thermal shock test at 130 °C, including the No. 4+3.7V1150mAh battery involved in this test. Amoi also uses batteries that have passed this standard test in mobile phone products customized for overseas operators. The quality is widely recognized by overseas operators.
The reporter learned that at present, both battery manufacturers and mobile phone manufacturers generally use 130 °C as the thermal shock test temperature standard for lithium-ion batteries, and generally adopt this standard in the design, production, quality inspection, and procurement of batteries. Several domestic and foreign battery manufacturers can only promise to achieve 130 ° C, 130 ° C has become the de facto temperature standard in lithium-ion battery thermal shock test.
It is also known that the thermal shock test means that the battery is placed in a hot box at a rate of (5 ° C ± 2 ° C) / min to 150 ° C ± 2 ° C and held for 30 minutes, the battery should not explode or ignite. This is a destructive test under simulated extreme conditions. In fact, it is difficult for consumers to encounter such an environment when using mobile phones. Even 130 °C is far beyond the daily use of mobile phones by consumers. Temperature limit. On the original batteries of Amoi and other mainstream mobile phone brands, there are very eye-catching texts to remind consumers not to put the battery in fire or heat to avoid explosion.
During the interview, the reporter learned that in addition to the temperature standard of the thermal shock test, there are several other standards in the old national standard of the 2000 version of the mobile phone battery that have been controversial in the industry. After 7 years, the new national inspection standard will be The introduction of the industry, the industry is looking forward to.
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