According to the official website of the National Standards Committee, GB/T 40559: Safety Requirements for Lithium Ion Batteries and Battery Packs for Balanced Vehicles has been released on the official website of the National Standards Management Committee on October 11, 2021, and this standard will be implemented from May 1, 2022. This article will analyze the requirements of the standards, so that enterprises can meet the standard requirements in product design and production. This standard specifies the safety requirements for lithium-ion batteries and battery packs used in balanced vehicles, and is also applicable to lithium-ion batteries and battery packs used in similar products such as electric scooters without self balancing function. Standard requirements 1. Identification and warning instructions: 2. Battery safety test: The specific test items are shown in the table below, and the tests that need to be noted include: 1. The items with a high probability of test failure are: external short circuit, thermal abuse and combustion injection, and heavy object impact (cylindrical battery); 2. The selection of the 7.6 heavy impact/extrusion test is the same as that of UN38.3, except for cylindrical batteries with a diameter of 18mm or more for heavy impact testing, all other batteries are subjected to extrusion testing. 3. Battery pack safety test:&Nbsp; The specific testing items are shown in the table below, and the contents that need to be emphasized include: 1. Immersion test: This test requires a charging and discharging cycle if the battery can continue to charge and discharge after a 24-hour immersion test. I have had the experience of electric scooter batteries catching fire during the storage process after being soaked out. The reason is that the soaking did not damage the batteries, but caused a short circuit. Therefore, similar situations may also occur during the testing process. I would like to remind you to be careful. 2. Flame retardant requirements: The shell, PCB board, and insulation materials have a combustion level of V-1 or above, and the wires need to pass the test in Appendix C of the standard (needle flame test); 3. Single battery overvoltage control: This test requires the addition of voltage monitoring equipment for one cell or parallel block during product design, and the control cell voltage should not exceed 1.05 times the specified upper limit voltage; 4. Reverse charging: Not only is the product required to have reverse polarity protection function, but also a device to avoid reverse polarity connection should be used in the design; 4. Other requirements:&Nbsp&Nbsp; 1. Key components: required to comply with the standards mentioned in the corresponding national, industry or standard&Nbsp&Nbsp&Nbsp; 2. Safety requirements for high-voltage battery packs: It is recommended that manufacturers avoid using high-voltage battery packs (DC not greater than 60V, AC peak not greater than 42.4V). Author: MCM Banghe Testing https://www.bilibili.com/read/cv14052155/ Source: Bilibili