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What is UN 38.3 T6 Test ? – Part 2

  3.Research on T6 Test Method For T6 test, due to the diversity of existing lithium battery types, it is necessary to select different test methods for different types of lithium battery cells. During the research of the lithium battery working group of the United Nations Transportation Expert Committee, the test methods such as crush , nail penetration , NASA blunt puncture, and Japanese PSE forced internal short circuit were included in the discussion.   These tests will be briefly introduced below: 1) Crush: crush test is a very common test method for lithium batteries, which is used in abuse tests of various standards. In IEC 60,086-4 Primary Batteries – Part 4: Safety of Lithium Batteries, this test is used as an alternative method for heavy impact test of some types of batteries. Generally, the battery is squeezed in two planes and released after reaching a certain pressure. This test can not cause internal short circuit to all types of lithium battery cells, but it i...
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What is UN 38.3 T6 Test ? – Part 1

  1.Lithium Battery Transportation Safety As a new type of clean energy, lithium battery has been supporting the products that are essential and accessible to people at any time. Therefore, its safety is related to all consumers, manufacturers and transport departments, which has aroused concern from all parties.   Lithium batteries are mainly divided into lithium metal batteries and lithium ion batteries. The cathode of lithium metal battery is lithium metal, and the positive and negative poles of lithium ion battery are compounds embedded with lithium ion. Since Sony Corporation of Japan successfully developed lithium-ion batteries in 1992 and commercialized them, they have been widely used as power supplies for mobile phones, portable computers, cameras, cameras, etc.  Due to their unique advantages such as high working voltage, high energy flow density, long cycle life, low self discharge and no pollution. Similarly, it is also gradually developed into a mainstream en...
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Li-ion Power Battery Crush Test – Part 2

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  2.1 Test preparation Cylindrical and square batteries are commonly used as power cell. The research object of this paper is a square cell, which is mainly composed of nickel cobalt manganese positive electrode and graphite negative electrode chemical material system. Single battery size: X Y Z=W x L x H=27 mm x 148 mm x 94 mm, rated voltage: 3.7 V, rated capacity: 37 Ah.  The single battery is arranged in the module in the form of superposition along the width direction (X direction) of the single battery. In this paper, the definition of module crush direction is consistent with that of monomer, and the battery monomer and module are shown in Figure 3. The displacement, load, voltage, temperature data and video data of the crush process were collected by extruding the cell and module with the indenter, and the test results were analyzed.   2.2 Results of cell crush test   Carry out the XYZ crush working condition test on the electric core in these three directions...
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Li-ion Power Battery Crush Test – Part 1

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  Guided and supported by policies, electric vehicles have entered a period of rapid development. The government and major engine manufacturers have formulated corresponding development plans for electric vehicles. In the future, electric vehicles will gradually replace traditional fuel vehicles.  However, after a series of reported electric vehicle collisions, fires and even explosions occurred again, making people focus on the safety of electric vehicles. The electric vehicle mainly uses the power battery as the power source, which leads to a series of problems such as power battery pack, high and low voltage wire harness and load end protection. However, due to the characteristics of integrated high voltage and high electric energy, the layout of power battery pack on the vehicle and collision protection need to be focused.   The existing laws and regulations put forward corresponding detection standards for the mechanical abuse of battery packs. However, under real ro...
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What is Environmental Safety Test of Lithium-ion Battery ?

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  Lithium ion battery, as well as the overall sample consisting of non user replaceable battery/lithium ion battery and its electronic products. For non user replaceable batteries, they should be installed in electronic products as a whole sample for standard lithium ion battery environmental safety test;  For non user replaceable lithium-ion batteries, they can be placed in electronic products as a whole sample, or they can be taken out separately for standard environmental safety test of lithium-ion batteries. It is recommended that they be preferred as a whole sample for testing. As air leakage, smoke, fire and even explosion may occur during the test, necessary protective measures must be taken, such as placing the sample in a ventilation device with explosion-proof function.   1.Low Air Pressure Test purpose: The low pressure test is used to simulate the impact of low pressure conditions on the safety of lithium ion batteries during air transportation. After the test...
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Low Pressure Environment and Thermal Runaway

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  While lithium battery brings convenience to people’s life, its safety is also concerned by everyone. The violent combustion of electrolyte will penetrate the metal plate, and the explosion limit of pyrolysis gas is higher than that of hydrocarbons.  The thermal runaway reaction of lithium battery is easy to cause dangerous events, and its high temperature characteristic is an important and basic parameter of fire hazard. Therefore, it is necessary to explore the impact of low-voltage environment on the thermal runaway release temperature of lithium batteries to reduce the risk of their use.   1. Overview of lithium battery Thermal Runaway The thermal runaway process of lithium battery includes two forms: primary explosion and combustion explosion. In the primary explosion stage, the internal temperature of the lithium battery will increase. If the pressure increases, the pressure relief port of the lithium battery will be opened and smoke will be continuously released....
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