Wiktor Wise
Hybrid electric vehicles (HEVs) are powered by both gasoline and electricity, with the electric motor using battery power to help the engine or move the vehicle independently for short distances. HEVs have two types of batteries: a low-voltage battery that powers systems such as the stereo, computers, and navigation, and a high-voltage battery, called the traction battery, that powers the vehicle's electric motor-generator unit and air conditioning compressor. The traction battery is expensive due to its complexity and the materials required to construct it. Hybrid battery conditioning is a cost-effective solution to restore hybrid vehicle performance and fuel economy, although it only applies to NiMH battery chemistry. The optimum battery size depends on whether the goal is to reduce fuel consumption, running costs, or emissions.
Characteristics and Values of Hybrid Electric Vehicles Battery Conditioning
| Characteristics | Values |
|---|---|
| Types of Electric Vehicles | Battery-electric vehicles (BEVs), Fuel cell electric vehicles (FCEVs), Hybrid-electric vehicles (HEVs) |
| Hybrid-electric vehicles (HEVs) | Powered by both gasoline and electricity |
| HEVs battery | Two batteries: a low-voltage battery and a high-voltage battery (traction battery) |
| Low-voltage battery | Powers systems like stereo, computers, and navigation |
| Traction battery | Powers systems like the electric motor-generator unit and air conditioning compressor |
| Battery charging | Cannot be plugged in to charge; charged through regenerative braking and the internal combustion engine |
| Battery conditioning | Applicable to NiMH battery chemistry; lithium-ion (Li-ion) batteries cannot be conditioned |
| Battery life | Most hybrid batteries have an eight-year or 100,000-mile warranty; modern batteries are more resilient |
| Optimum battery size | Depends on the aim: reducing fuel consumption, running costs, or emissions |
| Battery maintenance | Proper maintenance and daily driving can help extend battery life |
| Battery replacement | Third-party manufacturers offer cheaper alternatives to dealership batteries |
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What You'll Learn
- Hybrid electric vehicles (HEVs) have two batteries: a low-voltage battery and a high-voltage traction battery
- HEV batteries are charged through regenerative braking and by the internal combustion engine
- NiMH batteries can be conditioned to restore performance, but Li-ion batteries cannot be conditioned
- Proper maintenance and daily driving can help extend the life of a hybrid's low-voltage SLA battery
- Optimum battery size depends on factors such as driving conditions and desired reduction in fuel consumption or emissions
Hybrid electric vehicles (HEVs) have two batteries: a low-voltage battery and a high-voltage traction battery
The high-voltage traction battery, on the other hand, powers the vehicle's electric motor-generator unit and air conditioning compressor. This battery is more complex and expensive due to the exotic materials required for its construction. It is typically placed in a metal box, insulated from the rest of the car's body, and labelled with "high-voltage" signs for safety reasons. The traction battery provides power to the electric motor, which drives the vehicle's wheels. In some vehicles, the motor generators also perform a regenerative function, generating electricity from the rotating wheels during braking and transferring that energy back to the traction battery pack.
The high-voltage battery in HEVs is typically a nickel-metal hydride (NiMH) battery pack, which can be conditioned to restore performance and fuel economy. This process involves cycling the battery between 0% and 100% states-of-charge to break up the resistive layer of crystals that forms over time. However, lithium-ion (Li-ion) battery packs, found in some plug-in hybrid vehicles and most battery-electric vehicles, cannot be conditioned and may require replacement when their performance wanes.
It is important to note that the batteries in hybrid vehicles are highly corrosive and require specialized care and servicing by qualified technicians to ensure safety.
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HEV batteries are charged through regenerative braking and by the internal combustion engine
Hybrid electric vehicles (HEVs) are powered by an internal combustion engine and one or more electric motors, which use energy stored in batteries. Unlike electric vehicles, HEVs cannot be plugged in to charge their batteries. Instead, their batteries are charged through regenerative braking and by the internal combustion engine.
Regenerative braking is an effective method to increase the driving range of HEVs by minimising vehicle fuel consumption. During regenerative braking, the electric motor acts as a generator, capturing and storing the energy that is normally lost during braking in the form of brake energy. This recaptured energy is then stored in the battery. The use of regenerative braking in HEVs also helps to reduce the cost of charging, as it reduces the need for electricity from power sources.
HEVs can be either mild or full hybrids, with full hybrids having larger batteries and more powerful electric motors that can power the vehicle for short distances and at low speeds. Mild hybrids, also called micro hybrids, use a battery and electric motor to help power the vehicle and can allow the engine to shut off when the vehicle stops. Full hybrids can be designed in series or parallel configurations, with parallel hybrids being the most common design. In parallel hybrids, both the electric motor and the internal combustion engine directly drive the wheels.
The extra power provided by the electric motor in HEVs can allow for a smaller combustion engine. The battery can also power auxiliary loads and reduce engine idling when the vehicle is stopped, resulting in better fuel economy without sacrificing performance.
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NiMH batteries can be conditioned to restore performance, but Li-ion batteries cannot be conditioned
NiMH (Nickel-Metal Hydride) batteries are known to self-discharge when left unused, and they will need to be recharged after a period of extended storage. To restore their performance, these batteries can be conditioned by first draining them and then charging them. This process helps eliminate the "memory effect", which is a phenomenon where the battery appears to "remember" the charge level at which it has been most frequently operated and fails to charge beyond this level. Conditioning NiMH batteries is generally recommended once every ten charges. It is also worth noting that new NiMH batteries may need to be cycled a few times before they reach peak performance.
On the other hand, Li-ion (Lithium-ion) batteries have a different chemistry and structure, and they do not suffer from the same memory effect as NiMH batteries. While Li-ion batteries also self-discharge, this rate is typically much lower than that of NiMH batteries. The degradation of Li-ion batteries is primarily time-dependent, and they are expected to lose about 20% of their cyclable charge in 3-5 years or 1000-2000 cycles at room temperature. However, the degradation rate can be influenced by temperature and the state of charge.
The primary difference in the conditioning capability of the two battery types lies in their unique characteristics. NiMH batteries benefit from conditioning due to their tendency to experience the memory effect, while Li-ion batteries do not exhibit this behaviour. Therefore, while conditioning can help improve the performance of NiMH batteries, Li-ion batteries do not have the same requirement, and there is no standard method or procedure to condition them.
In summary, NiMH batteries can be effectively conditioned to restore their performance by discharging and recharging them, addressing the memory effect. Conversely, Li-ion batteries operate differently and do not require or benefit from conditioning, as they do not exhibit the same memory effect characteristics.
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Proper maintenance and daily driving can help extend the life of a hybrid's low-voltage SLA battery
Hybrid electric vehicles (HEVs) have two batteries: a low-voltage battery that powers systems like the stereo, computers, and navigation; and a high-voltage battery, called the traction battery, that powers the vehicle's electric motor-generator unit and air conditioning compressor. The low-voltage battery in a hybrid vehicle is a sealed lead-acid (SLA) battery.
Secondly, extreme temperatures can be detrimental to your hybrid battery, causing it to degrade more quickly. Avoid parking your car in direct sunlight for extended periods, and try to protect it from extreme cold. The optimal temperature to store your SLA battery is 15°C (59°F), allowing it to keep a fuller charge and last longer.
Thirdly, the type of tires you use can impact your hybrid battery life. Using low rolling resistance tires can improve fuel efficiency and reduce the strain on your battery, helping it last longer.
Finally, proper maintenance is key to prolonging the life of an SLA battery. Ensure that all connections are secure, as loose connection points can cause reduced performance or failure. Regularly clean plugs, terminals, and leads to prevent corrosion or dirt build-up, which may impede current flow. Additionally, when choosing a charger, ensure it is compatible with your specific battery type and provides optimal charging levels with minimal variation in voltage or amperage. Overcharging and undercharging can be detrimental to the health of your SLA battery.
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Optimum battery size depends on factors such as driving conditions and desired reduction in fuel consumption or emissions
The optimum battery size for hybrid electric vehicles depends on several factors, including driving conditions, desired fuel consumption reduction, and emissions considerations. Firstly, driving conditions play a crucial role in determining the optimal battery size. This includes factors such as terrain, temperature, and driving style. For instance, driving uphill requires more energy from the motor, reducing the range, while driving downhill or on flat terrain can conserve energy due to gravitational assistance. Similarly, extreme temperatures can impact battery efficiency, with cold weather slowing down chemical reactions and reducing performance, and high temperatures causing overheating and increased energy consumption for cooling. Aggressive acceleration and braking can also drain the battery faster.
The desired reduction in fuel consumption is another factor influencing the optimum battery size. A larger battery offers a longer range but increases energy consumption and greenhouse gas emissions over the vehicle's lifetime. It also contributes to higher purchase and operational costs. On the other hand, a smaller battery, combined with fast charging during long-distance trips, can be more cost-effective and environmentally friendly, especially for urban commuters. However, fast charging has its drawbacks, including higher costs and increased energy requirements for battery temperature control.
The optimal battery size is also influenced by external factors such as electricity and fuel prices, battery production costs, and changes in oil prices. These factors vary across different markets and user profiles. For example, a study by Özdemir and Hartmann (2012) found that, under assumed German market conditions in 2030, the optimum electric driving range for minimum costs was between 12 and 32 km, while the range for minimum GHG abatement costs was between 16 and 23 km.
Additionally, the type of hybrid electric vehicle (HEV) and its specific design also impact the optimal battery size. HEVs can be categorized into micro, medium, strong or full, and plug-in HEVs, each with different levels of fuel-saving benefits and electric-only range capabilities. The electric motor in HEVs can assist in recharging the battery, and the extra power can potentially allow for a smaller engine size. The frequency and length of trips are also important considerations, as shorter and more frequent trips can impact energy consumption and the efficiency of the thermal management system.
In summary, determining the optimum battery size for hybrid electric vehicles requires a comprehensive analysis of various factors, including driving conditions, desired fuel consumption reduction, emissions targets, market conditions, and vehicle design. By considering these factors, manufacturers can develop modular battery designs that meet individual customer requirements, ensuring optimal performance, cost-effectiveness, and environmental sustainability.
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Frequently asked questions
A hybrid electric vehicle (HEV) is powered by both gasoline and electricity. It combines the functionality of a gas-powered motor and an electric hybrid battery.
Hybrid electric vehicles cannot be plugged in to charge their batteries. Instead, the battery is charged through regenerative braking and by the internal combustion engine.
Hybrid batteries feature two electrodes sitting in an electrolyte solution. These electrodes are separated by a polymer film that prevents short-circuiting. The electrodes are bridged when the device is turned on.
Hybrid battery conditioning is a cost-effective solution to restore hybrid vehicle performance and fuel economy. By cycling the battery between 0% and 100% states-of-charge, the resistive layer of crystals can be broken up and the battery’s performance can be restored.
