Testing Chambers Knowledge

  2.1 Comparison of Structural Safety Requirements UL1973 puts forward more detailed and specific requirements for product shell. For example, there are specific requirements for non-metallic shell, metal shell, wall hanging support handle, cable and terminal. In these aspects,  IEC  and GB standards have no detailed specification requirements, but only require that the shell shall not be broken in relevant experiments, resulting in internal material exposure or liquid leakage. UL standard also regulates the reliable protective grounding of the shell, while IEC and GB have no protective grounding specifications for the battery system, which are implemented according to relevant electrical standards, which is easy to be neglected in the process of inspection.   2.2 Comparison of Safety Requirements for Battery The battery body safety here refers to the test requirements directly related to the battery, such as overcharge and discharge test. The national standard speci...

  1.2 Safety Standards for UL Energy Storage Systems UL(Underwriter Laboratories Inc.) The Safety Laboratory is the most authoritative independent and profit-making professional organization engaged in safety testing and identification in the United States, and its main safety standards for electrochemical energy storage are as follows: UL 1973 STANDARD FOR SAFETY ANSI CAN/UL-1973:2018，Batteries of Stationary,Vehicle Auxiliary Power and Light Electric Rail(LER)Applications UL 9540 Energy Storage Systems and Equipment Test Standard UL9540A Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems   UL1973 covers battery systems for energy storage in stationary applications such as photovoltaics, wind storage or UPS, as well as battery systems for light electric tracks and stationary railway applications, such as railway substations, and, in a similar way to IEC62619, covers common safety requirements.  However, unlike IEC, UL does not plan to compile li...

  Electrochemical energy storage system has the characteristics of convenient and flexible installation, fast response speed and good controllability, which can significantly improve the power grid consumption capacity of renewable energy sources such as wind and light, improve power quality, smooth the power grid flow, reduce power asset investment, and play an important role in promoting the transformation and development of energy transformation.  In recent years, lithium-ion battery energy storage systems have been able to flourish in the power industry in countries around the world due to their significant advantages such as high energy density, large discharge rate and declining cost. At the same time, the preparation and release of energy storage related standards are also constantly updated with the development of the energy storage industry. These standards and specifications have actively guided and promoted the development of the energy storage industry, but there a...

  There are increasing cases of lithium-ion battery product recall due to safety problems. The activity and high energy density of Li will bring great problems to the safety of lithium-ion batteries. At present, the screening, inspection methods and standards for the safety performance of lithium-ion batteries, especially the potential safety hazards caused by some potential micro structural defects, lag behind the development of lithium-ion battery technology, and the evaluation method and evaluation system have not yet met the requirements of lithium-ion battery safety performance evaluation. In view of this, this paper summarizes and analyzes some representative standards. 1.Introduction to battery safety performance testing standards At present, the widely used international standard is the lithium ion battery standard of the International Electrotechnical Commission ( IEC ). According to their respective needs, the International Air Transport Association (IATA), the United Nat...

  Thermal shock test chamber   is a kind of test products to provide extremely high temperature and very low temperature environment and in a short period of time for cold and hot shock environmental test equipment. Mainly used in electronics, communications, materials, instrumentation, scientific research and other fields of product safety and reliability test and product screening test. In order to test the product due to thermal expansion and contraction and resulting in structural and morphological changes or physical damage, is the ideal environmental test equipment for technology development, production and quality control and other scientific research and production.   Depending on the state of the sample during the test. Thermal shock test chamber is divided into static thermal shock chamber (sample stationary) and dynamic thermal shock chamber (sample moves with the sample basket), according to the different ways of moving the sample basket, dynamic thermal shock...

  Lithium-ion batteries, and a whole sample consisting of non-user replaceable batteries/lithium-ion batteries and their electronics. For non-user-replaced batteries, they should be installed in electronic products as a whole sample for standard lithium-ion battery environmental safety tests;  For non-user replacement lithium-ion batteries, they can be placed in electronic products as an overall sample, or the lithium-ion batteries can be removed separately for standard lithium-ion battery environmental safety tests, and it is recommended to give priority to testing as an overall sample. Since degassing, smoke, fire and even explosion may occur during the test, it is necessary to take the necessary protective measures, such as the sample is placed in a ventilation device with explosion-proof function.   1.Low Air Pressure Test purpose: Low pressure test is used to simulate the impact of low air pressure conditions on the safety of lithium-ion batteries during airlift, and...

  1.3 Overcharge test The overcharge of single battery shall be stopped after 1  I 1  (A) current constant current charging until the voltage reaches 15 times of the charging termination voltage specified in the enterprise’s technical conditions or the charging time reaches 1h. Observe for 1h. During this process, the battery shall not explode or catch fire.  The overcharge of module battery is also to stop charging after 1  I 1  (A) current constant current charging until the voltage of any single battery reaches 15 times of the charging termination voltage specified in the enterprise’s technical conditions or the charging time reaches 1h, and observe for 1h. During this process, the battery shall not explode or catch fire.   At the initial stage of overcharge test, the metastable layer of the solid electrolyte boundary film (SEI) formed on the surface of carbon negative electrode first exothermic decomposition reaction. Continue to charge, the batter...