LESSON 2:
LESSON 2:
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TYPES OF AUTOMOTIVE BATTERY
LEARNING OBJECTIVES
LEARNING OBJECTIVES
Identify and describe the major types of automotive batteries.
Compare the features, advantages, and disadvantages of each battery type.
Understand the maintenance requirements and suitable applications for different battery technologies.
Automotive batteries are designed to supply electrical energy to start the engine and power the electrical systems of vehicles. There are different types of automotive batteries, each designed for specific performance needs, durability, and vehicle technology.
Each type refers to how the battery is constructed, how it stores and delivers energy, and whether it requires maintenance.
FLOODED LEAD-ACID BATTERY (FLA)
A flooded lead-acid battery is a type of rechargeable battery that uses a liquid electrolyte composed of sulfuric acid and water to facilitate the chemical reactions between lead plates. The term "flooded" refers to the fact that the battery's internal plates are fully submerged in this liquid electrolyte. These batteries are also known as wet-cell batteries.
Flooded lead-acid batteries are widely used in automotive, solar energy storage, and backup power systems due to their reliability and cost-effectiveness. However, they require regular maintenance, such as monitoring electrolyte levels and adding distilled water when needed, to ensure proper operation and longevity. They are also vented, meaning they release gases during charging, and must be used in well-ventilated areas.
GEL CELL BATTERY
A gel cell battery is a type of sealed lead-acid battery in which the electrolyte (a mixture of sulfuric acid and water) is thickened into a gel-like substance by adding silica. This gelled electrolyte prevents spillage, reduces evaporation, and allows the battery to operate in various orientations without leaking.
Because the gel electrolyte does not move freely, gel batteries are spill-proof, maintenance-free, and vibration-resistant. They are particularly well-suited for deep-cycle applications, such as in renewable energy systems, mobility scooters, wheelchairs, marine equipment, and backup power supplies.
Gel cell batteries are very sensitive to overcharging, so they require a precisely controlled charging system to avoid damage. Compared to AGM batteries, gel batteries typically have a slower discharge rate and can last longer in moderate, deep-cycle use, but they may not perform as well under high current loads.
ABSORBENT GLASS MAT (AGM)
An Absorbent Glass Mat battery is a type of sealed lead-acid battery that uses a special glass fiber mat to absorb and hold the electrolyte between the lead plates. Unlike flooded batteries, the electrolyte in an AGM battery is not free-flowing, which allows the battery to be spill-proof, maintenance-free, and resistant to vibration.
The design improves efficiency by keeping the electrolyte in close contact with the battery plates, which allows for faster chemical reactions and better performance under high-load conditions. AGM batteries are commonly used in vehicles with high electrical demands, backup power systems, motorcycles, marine applications, and renewable energy systems.
Since they are sealed, AGM batteries do not require water refilling and can be installed in various orientations (except upside-down). They also tend to have a lower self-discharge rate, longer lifespan, and better deep-cycle capability compared to traditional flooded lead-acid batteries.
LITHUIM-ION BATTERY (LI-ION)
A lithium-ion battery is a type of rechargeable battery that uses lithium ions as the primary carrier of electric charge between the anode and cathode. During discharge, lithium ions move from the anode (typically made of graphite) to the cathode (usually made of a lithium metal oxide), and during charging, they flow in the opposite direction.
Lithium-ion batteries are known for their high energy density, lightweight design, low self-discharge rate, and long cycle life compared to traditional lead-acid batteries. They require no maintenance, do not need water refilling, and are typically sealed and safe when managed properly.
These batteries are widely used in consumer electronics (smartphones, laptops), electric vehicles (EVs), renewable energy storage systems, power tools, and many other applications. However, they are sensitive to overcharging, overheating, and physical damage, which can lead to thermal runaway or fire if not properly managed. To prevent this, lithium-ion batteries always require a Battery Management System (BMS) to monitor and regulate voltage, current, and temperature.
SUMMARY
SUMMARY
In This lesson, we examined four key types of automotive batteries: flooded lead-acid, AGM, gel cell, and lithium-ion. Each battery type has its own structure, benefits, limitations, and suitable applications. Understanding their characteristics helps vehicle owners, mechanics, and engineers make informed decisions regarding battery selection, maintenance, and safety. Flooded batteries are cost-effective but require maintenance; AGM batteries offer performance and durability; gel batteries excel in deep-cycle use; and lithium-ion batteries provide the best energy density and lifespan, especially in electric vehicles.
REFERENCES
REFERENCES
National Renewable Energy Laboratory. (2020). Battery types for electric vehicles and storage. Retrieved from
Battery University. (2022). Types of lead acid batteries. Retrieved from
https://batteryuniversity.com/article/bu-201-types-of-lithium-ion
U.S. Department of Energy. (2021). Energy storage systems overview. Retrieved from
https://www.energy.gov/eere/vehicles/energy-storage
Transport Canada. (2019). Vehicle battery safety and maintenance. Retrieved from
https://tc.canada.ca/en/services/road/vehicle-safety
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