Testing Chambers Knowledge

  Short Circuit Test Standard requirements: battery short circuit test includes single short circuit test and module short circuit test. The external short circuit of single battery is 10 min, and the external short circuit resistance is not greater than 5 m Ω; During the short circuit test of the storage battery, there shall be no explosion or fire. Analysis and research of test results: during the short circuit test of single power battery, the external short circuit resistance is 2.7 m Ω, the short circuit current is large, and a large amount of gas is ejected from the safety valve with electrolyte. The module short circuit current is several times of the single short circuit current (100 Ah short circuit current is nearly 4000 A).  The power battery reacts more violently, releasing a large amount of heat that melts the plastic shell of the power battery, causing serious deformation. Combustion often occurs in the process of module short circuit, mainly due to several reaso...

  With the increasing number of vehicles in the world, the problems of environmental pollution and lack of responsibility for oil resources are becoming increasingly prominent. Because of its advantages of green environmental protection, diversification of energy sources, and high energy efficiency, all countries in the world are actively working to research and develop electric vehicles that can replace traditional vehicles.  At present, power batteries for electric vehicles include lead-acid batteries, lithium-ion batteries, and zinc air batteries. Among them, lithium-ion battery is the latest high-performance battery researched and commercialized the fastest. It has been widely used in electric vehicle power batteries because of its high voltage, high specific energy and good cycle performance; However, due to its frequent safety accidents in the actual use process, its safety has been paid more and more attention. At present, there are two forms of power batteries. One is ...

  With the vigorous development of the electronic industry, all kinds of electronic products and electric products have gradually become indispensable tools for people to use, and the batteries closely related to them have gradually attracted people’s attention.  Among them, the safety of the battery itself is the focus of attention. A battery with potential safety hazards will become a time bomb around people at any time, endangering people’s lives.  There are many factors affecting the safety of the battery, and the high temperature and high pressure generated in the battery are directly related to the heat generation factors.  There are many heat generating factors. A certain impact test will generate heat inside the battery, and it can also detect the impact resistance of the battery and its subsequent stable state. Therefore, the   heavy impact test   is an important test item in the battery safety detection.   1.Test Standards In the process of b...

  Environmental conditions are the key factors that affect the quality and reliability of equipment. For equipment used in the environment where the ambient air temperature changes rapidly, the impact of temperature shock environment is a factor that must be considered.  This environment brings a variety of typical environmental effects to equipment, such as deformation or fracture of parts, insulation protection failure, clamping or relaxation of moving parts, changes of electrical and electronic components electronic or mechanical failure caused by rapid condensation or frost. Whether the equipment can work normally under the temperature shock environment directly reflects the adaptability of the equipment to this environment. According to method 503.4 (temperature shock test) of American military standard ML-STD-810 F, equipment that may be deployed in the environment with rapid air temperature change shall undergo temperature shock test. The test chamber must have the abil...

  1.Volume Selection When the tested product (components, components, parts or complete machine) is placed in the climate environment chamber for testing, in order to ensure that the tested product The ambient atmosphere can meet the environmental test conditions specified in the test specifications. The following provisions shall be followed between the working dimension of the climate chamber and the external dimension of the tested product: a) The volume of the tested product (Wide x Deep x High) shall not exceed (20 ~ 35)% of the effective working space of the test chamber (recommended) 20%). It is recommended that no more than 10% of the products that generate heat in the test be selected.   b) The ratio of the windward sectional area of the tested product to the total area of the test chamber on the section shall not be greater than (35 ~ 50)% (push) Recommended 35%).   c) The distance between the outer surface of the test product and the wall of the test chamber sh...

  1.Test Overview The impact experienced by the products during use and transportation is mainly due to the impact caused by the emergency braking and impact of vehicles, the air drop and crash of aircraft (emergency landing), the launch of artillery, the explosion of chemical energy and nuclear energy, the ignition separation and re-entry of missiles and high-performance weapons. Impact is to apply a high-level input pulse force to the product in a relatively short time.   Impact is a very complex physical process. Like random vibration, it has a continuous frequency spectrum, but it is also a transient process and does not have the condition of steady-state random. After the product is impacted, the movement state of its mechanical system will change suddenly and produce transient impact response. The response of products to mechanical impact environment has the following characteristics: high frequency oscillation, short duration, obvious initial rise time and high-order po...