Testing Chambers Knowledge

  3.Protection of hardware facilities The elements of personnel protection have been listed above. It is not difficult to prepare these equipment. The important thing is to use appropriate equipment on appropriate occasions. Laboratory management should standardize this effective document, remove the paralytic thought of test operators and maintain preventive awareness. Regular drills may be as important as configuring these equipment.   The test process of rolling test and impact ( impact ) test in abnormal work ( abuse ) test may produce violent response. The former is rolled with a force equivalent to 1000 times the self weight of the sample: the impact test is to drop a 9.1kg weight freely from 610mm and impact the sample.   The relatively closed steel  test chamber  has good protective effect, but it will be inconvenient because the line of sight is blocked in the test. The observation window can be opened with explosion-proof glass and protective net. The ...

  Basic contents of protection Compared with other types of power batteries, electric vehicle power lithium-ion battery is more prone to unsafe conditions such as combustion and explosion due to its electrochemical characteristics, structural characteristics and application environment, such as no special attention in the test process. During the  test , especially in the test with high severity. The safety protection of laboratory is an unavoidable reality.   In order to facilitate the description, the protective measures are divided into hardware facility protection of test personnel and equipment (for the protection of unsafe state caused by leakage, rupture, combustion and explosion) and software early warning / control protective measures for the purpose of avoiding state. Basic design of protection. Both aspects shall be considered comprehensively, and both shall be appropriate and effective. In addition, considering the protected objects, they can be roughly divide...

  2.1.2 Overcharge / overdischarge test In order to evaluate the function of overcharge / overdischarge protection system, it may occur when the battery charging or discharging exceeds the limits recommended by the manufacturer, such as charger failure. Almost all standards and regulations stipulate this test item The important safety hazards during overcharge are electrolyte decomposition, cathode and anode breakdown, diaphragm degradation and exothermic decomposition of lithium coating, resulting in battery overheating and heat out of control. If sufficient temperature is reached (e.g. 200 ℃), the fluorinated adhesive will undergo exothermic reaction with carbon lithium. The factors affecting the test results include the charging rate and the final SOC. For overcharge test, charge the battery according to the charging current specified in the standard until the set end charging conditions (such as 200% SOC, 130% SOC, etc.) are reached, or the protection device is used (such as di...

  Power lithium-ion batteries must pass a series of safety tests before they can be used in electric vehicles. These safety tests are to understand and identify the potential weakness and vulnerability of the battery under abnormal conditions, and determine the performance of the battery under severe conditions.  Due to the limitation of space, the author only analyzes and summarizes the international standards and regulations for electrical safety and harsh environmental testing of lithium-ion batteries for electric vehicles, and discusses the problems existing in the standards.   1. Overview of domestic and foreign standards and regulations Important international standards related to the safety and harsh environmental testing of lithium ion battery gas for electric vehicle power include:   IEC62660-2:2011 lithium ion power battery Part 2: reliability and abuse test;   ISO6469-1:2019 safety requirements for electrically driven road vehicles, Part 1: rechargeab...

  Battery product standards, especially safety standards, are not only an important basis for restricting quality, but also an important means to standardize market order and promote technological progress. This paper introduces, summarizes and analyzes the existing common standards, and briefly discusses the problems existing in these standard systems.   Common power lithium ion battery standards   international standards   Important power lithium ion battery standards published by IEC include IEC62660-1:2010 lithium ion power battery monomer for electric road vehicles Part 1: performance test and IEC62660-2:2010 lithium ion power battery monomer for electric road vehicles Part 2: reliability and abuse test.  UN 38.3  “United Nations recommendations, standards and test manual on the transport of dangerous goods” issued by the United Nations Transport Committee, the requirements for the test of lithium-ion batteries are aimed at the safety of batteries duri...

  Lithium ion battery, and the whole sample composed of non user replaceable battery / lithium ion battery and its electronic products. For non user replaceable batteries, they shall be installed in electronic products as an overall sample for environmental safety test of lithium-ion batteries in the standard;  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 the environmental safety test of lithium-ion batteries in the standard. It is recommended that they be preferentially selected as a whole sample for testing. As there may be air leakage, smoke, fire or even explosion during the test, necessary protective measures must be taken, such as placing the sample in a ventilation device with explosion-proof function.   Low pressure Test purpose: the  low-pressure test  is used to simulate the impact of low-pressure conditions on the safety of lithium-ion battery durin...