Why do I need to remove the negative electrode first and install the positive electrode first when changing the car battery?

　　Why do I need to remove the negative electrode first and install the positive electrode first when changing the car battery?

　　Why remove the negative pole of the battery first when checking the car circuit, install the positive pole first, and then install the negative pole? Anyone who understands batteries will know that the questioner is a noob. Of course, as a veteran of batteries, please be considerate of friends who have just entered the industry. Let’s follow the engineers of Inventec Electronics Co., Ltd. to understand why:

　　1. Disassembly: first dismantle the negative pole, then the positive pole

　　 First dismantle the negative pole for safety: because of the circuit structure of the car , The negative stage is connected to the body. If the positive stage is removed first, the positive stage may touch other parts of the car body and cause a short circuit. Even if the terminal is not so long that the car body cannot be touched, it will touch the car body when disassembling and use maintenance tools, which will also cause the battery. Short circuit.

　　 The short circuit of the battery is very dangerous. The lighter one will cause the battery short-circuit damage, and the serious one will cause the car to catch fire, with disastrous consequences.

　　2, installation: install the positive pole first, then install the negative pole

　　 The same is true when installing the battery positive stage first , It is also for safety. The positive electrode of the battery will not move when it is installed, because the negative electrode of the battery and the body are both negative, and there will be no short circuit even if they are in contact, and the negative electrode is just to be connected to the body.