The scorching hot days, with outdoor temperatures exceeding 35 degrees Celsius in many areas, are posing a significant challenge to electrified vehicles. Not only pure electric cars, but also hybrid vehicles are noticeably affected by ambient temperatures, particularly in their high-voltage battery systems and thermal management capabilities.
In reality, the common saying "hybrid cars are afraid of hot weather" doesn't necessarily mean they are prone to breakdowns or lack durability. However, it's undeniable that, compared to traditional gasoline cars, hybrids rely more heavily on battery and electric motor systems, making their performance more sensitive to prolonged high ambient temperatures.
Many users have expressed concern following reports suggesting that hybrid cars are "afraid" of hot weather.
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In hybrid vehicles, the high-voltage battery pack is considered the "heart" of the entire electrochemical system. Depending on the model, manufacturers may use either Nickel-Metal Hydride (NiMH) or lithium-ion batteries. Despite their differences in construction, both types of batteries are affected to some extent when operating in high-temperature environments.
Specifically, as the temperature rises, the chemical reactions inside the battery intensify, leading to faster heat buildup during charging and discharging. If the temperature exceeds safe limits, the Battery Management System (BMS) will proactively intervene to protect the battery from overheating. At this point, the vehicle may limit charging capacity, reduce electric motor power, or prioritize the use of the gasoline engine. This is also why many hybrid car owners notice increased fuel consumption on hot days, even though driving conditions don't change significantly.
In many cases, users feel that hybrid cars consume "unusually high fuel" in the summer, but the real reason is that the electrical system has to reduce its load to keep the battery within a safe temperature range.
In reality, hot weather does affect the performance of hybrid vehicle batteries to some extent, but the impact is not too serious.
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Besides the battery pack itself, the battery cooling system plays a crucial role in hybrid vehicles. Unlike traditional gasoline cars, many hybrid models are equipped with separate fans and air intakes to maintain a stable temperature for the high-voltage battery pack. On some models, the battery cooling air intakes are often located under the rear seats or on the side of the seats. If this area is obstructed by bags, blankets, floor mats, or accumulated dirt, airflow will be significantly reduced.
When cooling capacity decreases, the cooling fan has to operate continuously at a higher intensity to cool the battery. This not only reduces operating efficiency but can also cause the battery to degrade faster if this situation persists.
Many technical experts believe this is the most often overlooked detail on hybrid vehicles. Many owners have a habit of overloading the back seats with luggage or inadvertently blocking the air intakes, without realizing that the battery system still needs to "breathe" continuously to maintain a stable temperature.
Vietnam's climate also puts greater pressure on hybrid vehicles compared to many temperate markets. High ambient temperatures, high humidity, and prolonged traffic congestion in urban areas mean that vehicles frequently operate in a stop-and-go cycle at low speeds. This leads to rapid heat buildup, while natural heat dissipation is more limited than when driving on highways. Simultaneously, the air conditioning system has to work harder to cool the cabin, putting greater strain on the electrical system.
In many hybrid models, cabin air is also used to help cool the battery. Therefore, when the cabin gets too hot or the air conditioning is not working effectively, the battery pack temperature can also be affected.
Experts suggest that users shouldn't panic too much and should simply follow the manufacturer's recommendations.
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However, there's no need to panic about the risk of hybrid vehicles malfunctioning in hot weather. Manufacturers have carefully considered the vehicle's performance in extreme weather conditions. Most modern hybrids are equipped with temperature sensors, battery control systems, and automatic protection mechanisms against overheating.
Some hybrid vehicles using NiMH batteries are even rated as having fairly good heat resistance and durability in hot and humid climates. In fact, many Toyota and Honda hybrid models have traveled hundreds of thousands of kilometers in Southeast Asian markets without experiencing serious battery-related problems if properly maintained.
However, to ensure efficient operation and extend battery life, hybrid users should still avoid parking in direct sunlight for too long, regularly clean the air intake vents, and maintain the air conditioning at a reasonable level on hot days. For plug-in hybrid (PHEV) vehicles, users should also avoid charging the battery immediately after driving long distances in hot weather, as the battery temperature will still be high at that time.
Source: https://thanhnien.vn/vi-sao-xe-hybrid-so-troi-nong-185260521120550457.htm
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