Batteries in Electric Vehicles-Introduction and Fundamentals

Explore battery architecture from cell to module to pack, using Tesla's 8,256 cells in 16 modules to illustrate how this arrangement enables around 100 kilowatt energy and a 300-range.

Trace the history of batteries through the first electrochemical battery, a copper and zinc plate stack separated by paper disks, which produced a current and revealed voltage as chemical reactions.

Batteries convert chemical energy to electrical energy via oxidation at the anode and reduction at the cathode, driving electrons through a circuit to power devices and vehicles.

Explore the internal architecture of a lithium ion battery, including the cathode, anode, and separators. See how electrons move inside the cell.

Explore battery pack architecture, comparing battery modules to monolithic packs, and how modular design eases manufacturing, cooling, and maintenance, with a 14s pack example and module replacement benefits.

Explore the anatomy of a battery pack, including 18650 cells, cooling, the battery management unit, and PSU, and how safety procedures shape its size and performance in Tesla Model S.

Explore how electric vehicle charging standards safeguard safety and compatibility, detailing J1772 type 1 single-phase and 62196 three-phase schemes and the charger size defined by these standards.

Explain the CHAdeMO interlock of the connector for high-powered EV chargers, detailing automatic safety checks, a mechanical latch, and an electrical lock that releases only after safe conditions are verified.

Explain the key functions of the BMS: measure voltage, current, and temperature; control temperature and voltage; communicate battery data; and diagnose faults to maintain safe operation.

Understand why cell balancing matters in lithium-ion battery packs for electric vehicles, ensuring each cell reaches equal voltage despite manufacturing differences, improving depth of discharge, life cycles, and safety.

Explore active versus passive cell balancing, including flying capacitors and inductive flyback methods, their switching schemes, efficiency losses, and modern lossless balancing and redox shuttle concepts.

Understand balance current requirements for battery packs, including cross and maintenance balancing for mismatched cells; leakage and self-discharge govern current levels.

Explore how battery connectors in automotive packs must deliver low resistance, low thermal input joints while withstanding mechanical stresses, and learn how ultrasonic welding enables reliable interconnects for dissimilar materials.

Explain why thermal management is essential for lithium ion battery packs in electric vehicles, and compare surface cooling versus tab cooling and their impact on lifetime.

Explore air-based thermal control for electric vehicle batteries, contrasting passive cooling with no power and active cooling with outside air, including closed-loop systems and fast charging examples.