Otis Singleton
Hybrid electric vehicles (HEVs) are powered by both gasoline and electricity, and they have become a popular alternative to traditional gasoline-only cars. HEVs combine an internal combustion engine with a battery pack and electric motor. The battery pack, also known as a traction battery, stores energy and supplies power to the electric motor. This is different from a vehicle's 12-volt battery, which powers lighting and instrumentation systems. HEVs can have battery voltages ranging from 100 to 300 volts, and even up to 600 volts in some cases. These high-voltage batteries have raised safety concerns, especially in emergency situations. Proper safety equipment and procedures are necessary when working with HEV batteries.
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What You'll Learn
- Hybrid batteries are made of many small, low-voltage batteries called cells
- The cells are stacked to create one large high-voltage stick
- The high-voltage sticks are then connected to form a high-voltage battery module
- Hybrid vehicles use less gasoline and produce fewer emissions
- The battery recharges while the engine runs
Hybrid batteries are made of many small, low-voltage batteries called cells
Hybrid vehicles, or HEVs, are powered by both gasoline and electricity. They combine the functionality of a gas-powered motor and an electric hybrid battery, offering outstanding fuel economy and efficiency. The battery recharges through a process known as regenerative braking, where the energy produced when the driver presses the brake pedal is captured and used to recharge the battery.
Most hybrids use a nickel-metal hydride (NiMH) battery pack. Within each cell of the battery, there is a positive and negative electrode. Ions from the positive electrode move towards the negative electrode, where they accept electrons given up by the negative electrode. This process creates an electrical charge. The energy produced by the battery determines the electric range of the vehicle, and the available power from the battery determines the vehicle's acceleration.
The high-voltage nature of hybrid batteries has raised some safety concerns, particularly in the event of a traffic accident. To address this, the battery used to run the electric motor is placed in a metal box that is insulated from the rest of the car's body and labeled with "high-voltage" signs. This box is typically located behind the rear passenger seats, where it is less likely to be damaged in a collision.
Overall, the combination of small, low-voltage cells in hybrid batteries contributes to the efficiency and performance of hybrid vehicles, making them a popular alternative to traditional gasoline-only transportation.
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The cells are stacked to create one large high-voltage stick
Hybrid electric vehicles (HEVs) are powered by both gasoline and electricity. The battery pack in an HEV consists of many small, low-voltage batteries called cells. These cells are stacked on top of each other to create one large high-voltage (HV) stick. This configuration is known as cell stacking technology.
The stacking process results in a battery with lower internal resistance and higher winding internal resistance. This is because the laminated cell, with its laminated core electrode diaphragm, can be considered a multi-pole type, while the winding cell is typically a single-pole type. The reduced internal resistance leads to a slower attenuation of battery capacity. Additionally, the stacking process facilitates the discharge of large currents in a short time, benefiting the rate performance of the battery.
However, the stacking process is complex and time-consuming, requiring manual operation due to the difficulty in automating the equipment. In contrast, the winding process is simpler and more commonly used, as it can be easily automated for manufacturing.
The high-voltage sticks formed by stacking the cells are then connected to create a high-voltage battery module. This module is an essential component of the hybrid vehicle's electric system, powering the electric motor. The electric motor, in turn, can be used to move the vehicle or assist the gasoline engine, resulting in improved fuel efficiency and reduced emissions.
The high voltage present in hybrid vehicles, typically ranging from 100 to 300 volts, raises safety concerns. Proper precautions, such as following manufacturer guidelines and using appropriate safety equipment, are crucial when working on or handling hybrid vehicles to mitigate the risks associated with high-voltage systems.
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The high-voltage sticks are then connected to form a high-voltage battery module
Hybrid-electric vehicles (HEVs) are powered by both gasoline and electricity. The electric motor uses battery power to help the engine or move the vehicle independently for short distances. As the engine runs, the battery recharges. The battery pack includes an array of physically connected battery cells and battery management hardware and software. This high-voltage battery is very different from a vehicle's 12-volt battery that powers lighting and instrumentation systems.
The battery pack is formed when several modules are jointly controlled or managed by the BMS and the thermal management system. Each battery module is connected to the high-voltage electrical system of the whole vehicle through a series-parallel connection and a high-voltage busbar. The overall voltage level of the battery pack will be higher compared to the cells and modules.
To provide sufficient power, battery packs require a minimum voltage level that a single cell cannot achieve. Multiple cells are, therefore, connected in series to boost voltage. Some designs use small-capacity cells. To achieve the desired battery energy, cells are connected in parallel to boost capacity. Cells connected in parallel provide power as if they were a single, larger cell.
The battery pack is the most expensive part of an electric vehicle, accounting for roughly 30% of the total electric vehicle cost. The manufacturing cost accounts for approximately 30% of the total power unit cost. Therefore, each solution to decrease the cost in assembly can produce a cost reduction for the final user.
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Hybrid vehicles use less gasoline and produce fewer emissions
Hybrid vehicles are powered by both a gas engine and an electric motor, with a battery pack that can be recharged through regenerative braking and by the internal combustion engine. This means that hybrid vehicles use less gasoline than traditional cars and produce fewer emissions.
Hybrid vehicles are an increasingly popular alternative to traditional gasoline-only cars. They combine an internal combustion engine with a battery pack and electric motor. The battery pack stores energy and supplies power to the electric motor, and it includes connected battery cells and battery management hardware and software. The high-voltage battery is very different from a vehicle's standard 12-volt battery, which powers lighting and instrumentation systems.
The electric motor in a hybrid vehicle can be used to slow the vehicle down, capturing energy in the process. This is known as regenerative braking. The extra power provided by the electric motor can also allow for a smaller engine, improving fuel economy without sacrificing performance. The battery can also power auxiliary loads and reduce engine idling when stopped.
Hybrid vehicles produce fewer tailpipe emissions than conventional vehicles, and zero tailpipe emissions when running only on electricity. They are therefore more environmentally friendly and produce fewer emissions that contribute to smog, haze, and health problems, such as greenhouse gases.
However, it is important to note that the environmental benefits of hybrid vehicles are dependent on the energy used to charge their batteries. For example, in countries that use hydropower, electric vehicles have a minuscule carbon footprint. In countries that rely on burning coal, electric vehicles produce more carbon emissions, but still fewer than gasoline-powered cars.
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The battery recharges while the engine runs
Hybrid cars combine two propulsion systems or motors, using the combustion engine as the main power source and the electric motor to assist the engine or move the vehicle independently for short distances. The battery recharges while the engine runs, and this process can be replicated in several ways.
Firstly, the electric motor acts as a generator, and is activated by decelerations, regenerative braking, and the combustion engine itself. When braking and releasing the accelerator pedal, hybrid cars recover power by using the kinetic energy of the rotating wheels while the car slows down. This kinetic energy is then transformed into electric energy by the generator and stored in the battery. This stored energy will then be used to start the car and travel at low speeds without needing to use the combustion engine, thus reducing fuel consumption.
Secondly, when travelling at a constant speed or when the battery is out of power, hybrid cars use the energy generated by the combustion engine to recharge their batteries. This process is known as regenerative braking, where the electric motor in an electrified vehicle is used to slow it down, capturing energy in the process.
Thirdly, plug-in hybrids (PHEVs) can also be used, which use the same hybrid functions as strong HEVs but have a longer electric-only range. These vehicles plug into a charger to replenish the battery's charge, and once the battery is depleted, the engine assists in recharging the battery for continued driving. Plug-in hybrids are more powerful and perfect for city driving, as they can cover long distances with the electric motor alone.
Finally, the two most prolific hybrid manufacturers on the market, Toyota and Honda, each have battery packs with around 100 to 200 volts, with the voltage in the Toyota Prius able to be boosted up to 600 volts through a voltage converter. These battery packs are placed in a metal box that is insulated from the rest of the car's body and labelled with "high-voltage" signs.
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Frequently asked questions
A hybrid electric vehicle (HEV) is powered by both gasoline and electricity. It combines an internal combustion engine with a battery pack and electric motor.
The voltage of a hybrid electric vehicle battery varies. The two most prolific hybrid manufacturers, Toyota and Honda, have battery packs with around 100 to 200 volts. In some cases, the voltage can be boosted, for example, in the 2010 Toyota Prius, the voltage can be boosted to 600 volts through a voltage converter.
Hybrid electric vehicles use regenerative braking or combustion engines to recharge their batteries. They are designed to boost the efficiency of a gasoline engine, with power constantly flowing into and out of a small, compact, and lightweight battery.
