What is the new energy car battery?

New energy vehicle batteries can be divided into two categories, namely batteries and fuel cells. The battery is suitable for pure new energy vehicles, and can be classified into lead-acid batteries, nickel-based batteries (nickel-hydrogen and nickel-metal hydride batteries, nickel-defence and nickel-zinc batteries), sodium-based batteries (sodium-sulfur batteries and Sodium nickel chloride battery), secondary lithium battery, air battery and other types. The fuel cell is dedicated to fuel cell new energy vehicles and can be divided into alkaline fuel cell (AFC), phosphoric acid fuel cell (PAFC), molten carbonate fuel cell (MCFC), solid oxide fuel cell (SOFC), proton exchange. Membrane fuel cell (PEMFC), direct methanol fuel cell (DMFC) and other types.

A new energy vehicle battery pack consists of a plurality of batteries stacked in series. A typical battery pack has about 96 batteries. For a Li-Ion battery that is charged to 4.2V, such a battery pack can produce a total voltage of more than 400V. Although the automotive power system treats the battery pack as a single high-voltage battery, charging and discharging the entire battery pack each time, the battery control system must consider each battery condition independently. If one of the battery packs has a slightly lower capacity than the other batteries, the state of charge will gradually deviate from the other batteries after multiple charge/discharge cycles. If the state of charge of this battery is not periodically balanced with other cells, it will eventually enter a deep discharge state, causing damage and eventually forming a battery pack failure. To prevent this from happening, the voltage of each battery must be monitored to determine the state of charge. In addition, there must be a device that allows the batteries to be individually charged or discharged to balance the state of charge of these batteries.