The reason is to ensure that electric vehicles can be charged quickly and safely. According to the relevant query information, the 72-volt lithium battery electric vehicle charger uses alternating current (AC) power for charging. In an AC circuit, the voltage is alternately positive and negative, meaning current flows back and forth. Therefore, in this case, one terminal must be connected to the positive terminal of the power supply and the other terminal to the negative terminal of the power supply to ensure proper operation of the device.
Two of the same color are positive poles, and the other two are negative poles. They are used on equipment. A positive pole and a negative pole are connected to the equipment for discharge, and there are. two positive poles. The negative electrode is exposed for charging.
The four exposed wires are the wires ofbattery charging, which play the role of balancing the charge of the lithium battery, that is, balancing the voltage of each battery. Do not load and unload at the same time. to avoid danger and damage to the charger.
Detailed information:
Mechanism of action:
Lithium ion The battery uses a carbon material as the negative electrode and a lithium-containing compound as the positive electrode. There is no metallic lithium, only lithium ions. Lithium-ion battery refers to the general term for batteries using lithium-ion intercalation compounds as positive electrode materials.
The charging and discharging process of lithium-ion batteries is the process of intercalation and deintercalation of lithium ions. During the process of intercalation and deintercalation of lithium ions, it is also accompanied by the incorporationn and the deintercalation of electrons equivalent to lithium ions (it is customary to express the positive electrode by insertion or deintercalation, and the negative electrode by insertion or deintercalation).
During the charging and discharging process, lithium ions are inserted/deinterposed and inserted/deinserted back and forth between the positive and negative electrodes, which is vividly called "rocking chair battery" .
When the battery is charged, lithium ions are generated on the positive electrode of the battery and the generated lithium ions move to the negative electrode via the electrolyte.
The carbon used as a negative electrode has a layered structure with numerous micropores. The lithium ions that reach the negative electrode are integrated into the micropores of the carbon layer. The more lithium ions, the higher the value. charge capacity. Likewise, when the battery is discharged (i.e.re the process in which we use the battery), the lithium ions embedded in the carbon layer of the negative electrode are released and return to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity.
Baidu Encyclopedia – Lithium-ion battery