7 Questions
What is the purpose of the Electrical Distribution System (EDS) in a vehicle?
To provide electrical conduction
Why is isolation testing necessary for the high-voltage system in a vehicle?
To ensure the high-voltage system is completely isolated from the vehicle
What is the normal operating range for state-of-charge in a vehicle's HV battery pack?
52-68%
What are the two types of cell balancing necessary for long battery life?
Passive and active
What is the purpose of the Battery Management System (BMS) in a vehicle?
To monitor the battery during normal operation
What is the effect of hot temperatures on battery health in a vehicle?
It leads to faster decline in battery health
Which type of charger speeds up degradation of the battery in a vehicle?
DC fast-chargers
Study Notes
- The Electrical Distribution System (EDS) provides electrical conduction and has several features, including isolation, current and voltage measurement, pre-charge function, fusing, manual disconnect, and insulation monitoring.
- The low-voltage wiring powers battery control functions and communication between the battery and vehicle.
- Isolation testing is necessary to ensure the high-voltage system is completely isolated from the vehicle.
- State-of-charge management is crucial to prevent overheating and maximize battery service life.
- The HV battery pack controller monitors state-of-charge, and the normal operating range is within 52-68%.
- Scan data test procedures can be used to check battery state-of-charge and internal resistance.
- Defective high-voltage battery components can be replaced instead of the entire battery to reduce repair time and cost.
- Battery modules can be replaced, and internal resistance should be matched as closely as possible.
- Connecting batteries in series requires close voltage matching, and a diagnostic trouble code may occur if there is a voltage difference.
- Factors affecting battery life and degradation include energy storage decline, liquid-cooled vs. air-cooled batteries, and vehicle use.
- Hot temperatures lead to faster decline in battery health
- DC fast-chargers speed up degradation, especially in hot climates
- Passive and active cell balancing are necessary for long battery life
- Passive balancing dissipates energy from most charged cell as heat
- Active balancing transfers energy from most charged cell to least charged cells
- Battery management system (BMS) monitors battery during normal operation
- BMS calculates SOC and determines charging rate
- Dealerships may have special chargers for HEV battery packs
- Best charger for HEV battery is the vehicle itself
- Follow manufacturer's specified procedures when starting a disabled hybrid vehicle.
Test your knowledge about hybrid electric vehicle battery systems with this quiz! From the electrical distribution system to battery management and factors affecting battery life, this quiz covers all the essential topics you need to know. Learn about the different types of balancing, the importance of state-of-charge management, and how to diagnose and replace faulty components. Whether you're a seasoned mechanic or just getting started, this quiz is a great way to expand your knowledge of hybrid electric vehicle batteries.
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