Discussion on the effectiveness of forced internal short circuit,
battery,

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ANATEL is a short for Agencia Nacional de Telecomunicacoes which is Brazil governmental authority to certified communication products for both compulsory and voluntary certification. Its approval and compliance procedures are the same both for Brazil domestic and abroad products. If products are applicable to compulsory certification, the testing result and report must be in line with the specified rules and regulations as requested by ANATEL. Product certificate shall be granted by ANATEL first before product is circulated in marketing and put into practical application.

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The introduction of the “mandatory internal short-circuit test” has been subject to more controversy. The focus is on whether the state of the internal short-circuit can be simulated correctly. The questions raised are mainly as follows: A) The battery destroys its electrochemical environment during the disassembly process. Although the disassembly process requires the dew point to be lower than -25℃, it still cannot fully guarantee that the battery maintains its original state. B) Whether the nickel sheet can pierce the diaphragm, and if it does not pierce, can it be said that the test is qualified. Step 7 Installation Install the jip for pressing. The bottom surface of the moving part of the press equipment(i.e. pressing jip) is made of nitrile rubber or acrylic resin, which is put on the 10x10mm stainless steel shaft. The nitrile rubber bottom surface is for a cylindrical cell test. For a prismatic cell test, 5×5 (2mm thickness)acrylic resin is put on the nitrile rubber. Step 8 Set the parameters The fixture is moved down at a speed of 0.1mm/s. Set the cutoff condition: force of the press reaches pressure reaches 400N for a prismatic cell and 800N for a cylindrical cell or the voltage drops more than 50mV. Maintain 30s under the cutoff condition. Step 9 Crush The sample was tested when the temperature met the test requirements. Step 10 Acceptance Criteria No fire. Record the force when an internal short-circuit occurs if there was no fire.
本 期 主 要 内 容 第 12 页C) Is there any other test method to simulate the internal short circuit of the battery? We will discuss the above issues in detail: According to the accumulation of test samples for many years, the electrolyte is completely volatilized during the disassembly process, the pole pieces are completely dry and the coating material falls off about 5%. The possible causes are: the environment of dismantling fails to meet the requirements, and the dismantling time is too long. For the case that the nickel plate did not puncture the diaphragm, the test in this case should be considered unsuccessful in my personal understanding. Therefore, whether the sample passed the forced internal short circuit test needs to be tested again. The reason is that the purpose of this test is to simulate the occurrence of an internal short circuit. If the nickel plate does not puncture the diaphragm, there will be no occurrence of a short circuit, that is, no simulation to the occurrence of a short circuit. The simple way to determine whether the diaphragm is pierced is to see whether there is a voltage drop during the test