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The reason why Lithium iron phosphate ion battery is easier to pass acupuncture is not because of advanced technology, but because of the good thermal stability of the material itself, and the high energy density of the ternary lithium ion battery. Needling does pose challenges, but it is not impossible. To achieve true market security, it is necessary to ensure it through various levels of security system systems, rather than through a single test. In other words, batteries that pass needle testing may not be 100% safe, and not conducting needle testing does not mean that the battery is unsafe.

CATL has possessed the technology to let the high-energy density ternary lithium-ion battery pass the acupuncture test, and passed the acupuncture test in the TUV certification laboratory in Japan and the TUV certification laboratory in Shenzhen. The insider said: "But CATL still supports the new national standard to cancel the acupuncture test, and hopes that the industry will focus on the safety issues at the whole system level". To achieve true market security, it is necessary to ensure it through various levels of security system systems, rather than through a single test.

The new national standard focuses on the requirements of thermal safety, mechanical safety, electrical safety and Functional safety of the battery system while adjusting the test of single battery and module. In particular, the standard adds the thermal diffusion test of the battery system, which clearly requires that the battery system will not fire or explode within 5 minutes after the Thermal runaway of a single cell of the battery, so as to reserve a safe escape time for passengers.

Methods for Improving Acupuncture Projects

1. Conductive agent and bonding agent: After acupuncture short circuit, the conductive agent, bonding agent and electrolyte react violently, releasing a large amount of heat. Currently, DSC method is used, and selecting the type of conductive agent and bonding agent based on the initial temperature of decomposition and reaction heat is an effective method to reduce high-temperature heat generation;

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