What are the types of car batteries?

　　Car batteries can generally be divided into three types: ordinary batteries, dry-charge batteries and maintenance-free batteries. If the lithium battery 18650 3.7v needs to be changed, the negative pole must be disassembled first, then the positive pole. However, when installing, the positive pole must be followed first and then the negative pole. order. Then I will introduce the relevant content to you in detail.

　　1. Various classifications of car batteries

　　1. Ordinary lithium battery 18650 3.7v

　　The plates of ordinary batteries are composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. Its main advantages are stable voltage and low price; its disadvantages are low specific energy (that is, the electrical energy stored per kilogram of lithium battery 18650 3.7v), short service life and frequent daily maintenance.

　　2. Dry charge lithium battery 18650 3.7v

　　Its full name is dry-charged lead-acid lithium battery 18650 3.7v. Its main feature is that the negative plate has a high power storage capacity. In a completely dry state, it can store the power obtained within two years. When using it, just add electrolyte liquid, wait 20-30 minutes before use.

　　3. Maintenance-free lithium battery 18650 3.7v

　　Due to its structural advantages, maintenance-free batteries consume very little electrolyte and basically do not need to replenish distilled water during their service life. It also has the characteristics of shock resistance, high temperature resistance, small size and low self-discharge. The service life is generally twice that of ordinary batteries. There are also two types of maintenance-free batteries on the market: the first type requires a one-time addition of electrolyte when purchased and does not require maintenance (adding replenishing fluid) during subsequent use; the other type is that the lithium battery 18650 3.7v itself has electrolyte added and sealed at the factory. , the user cannot add refill fluid at all.

　　2. Car lithium battery 18650 3.7v replacement skills

　　1. The order of disassembly and assembly of the positive and negative poles of the lithium battery 18650 3.7v pack is very particular.

　　When disassembling and assembling an old lithium battery 18650 3.7v, be sure to proceed in the following order: disassemble the negative electrode first, and then disassemble the positive electrode. Because the car body is connected to the negative electrode of the lithium battery 18650 3.7v (ground terminal), during the disassembly and assembly process, if the positive electrode is disassembled first , the screwdriver may touch the car body. Once touched, it is equivalent to directly connecting the positive and negative poles of the car body, which may cause the lithium battery 18650 3.7v to short-circuit and burn. Therefore, when disassembling, the negative pole should be first, then the positive pole, but when installing, the order of positive pole first and then negative pole should be followed.

　　2. The lithium battery 18650 3.7v replacement process is simple

　　In fact, lithium battery 18650 3.7v replacement is very simple. As long as you prepare the tools and become familiar with the relevant precautions, it is not considered manual labor. Nowadays, most models of batteries are located in the engine compartment (the trunk of some pure electric vehicles), some are covered with protective shells, and some are directly exposed. Loosen the nut of the negative electrode connector: Open the two fixing buttons of the insulation cotton. You can see two red and black insulation covers on the positive and negative electrode connectors. Open the insulation cover and you can see the locking nut. Remove the negative electrode joint: Use a wrench or hex socket to unscrew the fastening nut of the negative electrode, then use a flat-blade screwdriver to slowly pry open the joint block, and then remove the negative electrode joint head.

　　3. Remove the positive connection: use the same method to remove the positive connection.

　　Remove the locking strap: Unscrew the nut of the locking strap that secures the lithium battery 18650 3.7v, then loosen the locking strap and remove the lithium battery 18650 3.7v. Just follow the reverse steps to install a new lithium battery 18650 3.7v, but be aware that the installation order of the positive and negative contacts is positive first and then negative. The installation order of the positive and negative contacts is the same as the order of disassembly and assembly, both to prevent short circuits. Danger, stay safe.

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