How to correctly understand the safety test and abuse test standards of power batteries?

The test of acupuncture batteries has been an important indicator of the safety performance of lithium batteries for a long time. However, insiders of the Ningde Times said that passing acupuncture does not mean that the battery is safe, and not doing acupuncture does not mean that the battery is unsafe. The insider said that many people now confuse the safety test of the power battery with the abuse test, and the acupuncture test belongs to the old version of the abuse test. The security test is a corresponding test formulated with the goal of personnel protection combined with certain scenarios. Abuse testing refers to the exploration of the boundaries of some battery performance under very extreme conditions. Not long ago, BYD showed off its new weapon blade battery. Once this battery was released, it attracted a lot of attention. The competitive situation between BYD and Ningde era is also more tense. Prior to this, BYD had repeatedly passed the 'acupuncture test' to prove its safety, and the negative case was a ternary lithium battery that caught fire as soon as it was acupuncture. The main product of China's leading power battery Ningde era is the ternary lithium battery, so this test is interpreted by some people as BYD's 'showing muscles' to the Ningde era. In addition to better space utilization, the biggest promotion point of blade batteries is safety. However, the Ningde era believes that BYD is'confusing concepts'. Regarding the issue of the acupuncture test, the media spoke to insiders in the Ningde era. The person told the media that passing acupuncture does not mean battery safety, and not doing acupuncture testing does not mean that battery is unsafe: 'The safety of power batteries is mainly reflected in system thermal safety, mechanical safety, electrical safety and functional safety, not just The safety of batteries. In his view, the needle-piercing single cell is similar to the ignition test of the flammability of gasoline and diesel, completely ignoring the protective effect of the fuel tank. Du Guozhong, assistant to the general manager of BYD Sales Co., Ltd., also admitted that acupuncture is a test under extreme conditions, which usually does not happen, and now all battery packs are protected by high-strength casings, so consumers don't need to worry too much. However, he also emphasized that different types of batteries have different performances in acupuncture experiments, which are closely related to battery materials, enterprise technology, process and quality control level, which is of certain significance. Today, among the more than 300 test methods in the battery field, the most difficult one is still the acupuncture test. Since the start of the new energy automobile industry was much later than that of 3C electronic products, the relevant test standards of the previous automobile power battery directly quoted the battery test of 3C consumer electronics. The acupuncture test is derived from 3C consumer electronics lithium-ion battery abuse safety test requirements in the early 21st century, and is used to simulate the consequences of thermal runaway caused by external sharp foreign objects pierced by exposed batteries. At that time, in order to pass the acupuncture test, many electronic products built-in design protection for short-circuit discharge. This design not only took up space, but also often caused improper startup. What is the difference between safety test and abuse test of power battery? Almost all current power battery packs are made of 20mm thick aluminum profiles, which are durable and corrosion-resistant. External sharp objects such as ordinary small steel nails cannot pierce the shell, and there is no chance to pierce the internal modules and batteries. With the development of the times, batteries have begun to be integrated into electronic devices. With the protection of the device casing, the possibility of the battery being pierced by external sharp foreign objects such as nails is almost zero. In 2012, the acupuncture test requirement was deleted during the revision of the 3C consumer electronic lithium-ion battery abuse safety test requirement standard. On May 18, China’s first mandatory national standard 'Safety Requirements for Power Batteries for Electric Vehicles' in the field of electric vehicle power batteries clearly abolished the needling test, and the standard no longer conducts a separate needling test. Evaluation. 'Under real conditions, the battery cell will not be punctured by needles, and the bottom of the battery pack is 'blunt puncture' and squeezing is the test method that is more in line with the real scenario,' Ningde Times insiders said, 'Currently, various car companies and batteries Companies have incorporated the bottom ball hit test into the experimental requirements. 'The three reasons for the cancellation of the acupuncture test in the standard formulation are: IEC (International Electrotechnical Commission) battery standard does not use acupuncture; according to past experience, acupuncture does not match the actual failure mode; 'New Energy Vehicle Manufacturers and Products Standard The 'Regulations on Entry Management' stipulates that acupuncture is a temporarily non-implemented item. Insiders of the Ningde era said that the easier needling of lithium iron phosphate batteries is not because of advanced technology, but because the material itself has good thermal stability, but for ternary batteries with higher energy density, acupuncture is a challenge, but it is not Can't make it. While adjusting the battery cell and module testing, the new national standard emphasizes the requirements for thermal safety, mechanical safety, electrical safety, and functional safety of the battery system. In particular, the standard adds the thermal diffusion test of the battery system, which clearly requires that after a single battery cell is thermally out of control, the battery system will not catch fire or explode within 5 minutes, leaving a safe escape time for the occupants. Disclaimer: The published articles are all from the Internet and do not represent the views of this site. 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