The motor and electrical control of the first and third electrical systems are also called electric drive and electrical control. The electric drive here refers to the motor and motor controller, and the electric control refers to the vehicle controller. However, in terms of vehicle controller, the vehicle controller of new energy vehicles is not very different from the traditional vehicle controller, and its maturity is relatively high. In this paper, the vehicle controller is no longer considered, that is, the three-electric system in this paper refers to the battery, motor and motor controller.
Battery: that is, power battery system, including lithium-ion battery system and fuel battery system. This paper only introduces the lithium ion battery system; Motor: namely motor, the main driving device of NEV; Electronic control: that is, motor controller, an integrated circuit that controls the motor to work according to the set direction, speed, angle and response time through active work.
Second, the power battery system (package) and module
Third, the battery core.
1. Introduction of Lithium-ion Battery Lithium-ion battery is essentially a secondary battery (rechargeable). Compared with ordinary secondary batteries, it has the advantages of high voltage, high energy density and no memory effect.
A lithium ion battery consists of a positive electrode (containing aluminum foil, positive electrode material, conductive agent and adhesive), a negative electrode (containing copper foil, negative electrode material, conductive agent and adhesive), a diaphragm and an electrolyte, and then it is packaged. The positive electrode is generally lithium ferrous phosphate, lithium nickel cobalt manganate (ternary material), lithium manganate, lithium cobaltate, etc. The first two are generally used in NEV cars, the latter two are used in digital batteries or power tools, and the negative electrode is generally made of artificial graphite.
Lithium ion battery is relative to lithium battery. Lithium battery is a battery with lithium as the negative electrode, and it is easy to produce lithium dendrites and puncture the diaphragm during the cycle, which has great safety hazards. The cathode of lithium battery is made of material (graphite, etc.). ) can embed/embed lithium ions, which solves the problem of lithium dendrite, greatly improves the safety performance and has the conditions for large-scale application.
(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)