Charging EV in Cold Weather:Common Problems and Solutions

The impact of extreme temperatures on electric vehicles has always been a concern for many car owners. How to cope with the effects of cold weather directly determines whether you can have a worry-free driving experience in winter. Read on for a complete guide.

1. What is the electric vehicle range?

Electric vehicle range is the distance a vehicle can travel continuously on a full charge. Actual range is affected by speed, temperature, air conditioning, and driving habits, and is usually lower than the official figures. The remaining driving range is usually displayed on the vehicle’s instrument panel or central control screen. The theoretical range is calculated as: battery capacity (kWh) × miles per kWh (miles/kWh).

2. Why Does Cold Weather Reduce EV Range?

Slower Lithium-ion Movement

• Low temperatures thicken the battery electrolyte, slowing lithium-ion movement and increasing resistance.
• This reduces the battery’s ability to accept charging current, which in turn slows down charging speeds.

Significant Increase in Battery Internal Resistance

The lower the temperature, the greater the battery’s internal resistance. Increased internal resistance leads to:

• Decreased charging efficiency
• Increased heat generation
• The BMS (Battery Management System) must reduce charging power to protect the battery.

Safety Mechanisms

Fast charging in low temperatures can easily cause lithium plating, so the BMS will forcibly limit the fast charging power and use a small current to preheat the battery to reduce damage to the battery.

The battery needs to be “preheated” first

When most electric vehicles are plugged in at low temperatures:

• Almost no charging occurs for the first 5-10 minutes
• Energy is prioritized for preheating

3. How Much Slower Is EV Charging in Cold Weather?

This depends on the type of charger you use, environmental factors, and whether the battery is preheated:

Level 1 Charger

Features:

• Lowest current, lowest power, least stress on the battery

Performance:

• 0℃: Slows down by approximately 10%–20%
• -10℃: Slows down by approximately 20%–30%

The slowdown is least noticeable, but charging is already very slow, and low temperatures will make charging even longer.

Level 2 Charger

Features:

• Mainstream for home/public use, medium power
• Cold weather slowdown: approximately 20%–50%

Performance:

• 0℃: Slows down by approximately 20%–30%
• -10℃: Slows down by approximately 30%–50%

Moderate slowdown; charging overnight will take 1–3 hours longer.

DC Fast Charging

Features:

• High-power direct charging to the battery, BMS restrictions are strictest at low temperatures

Performance:

• 0℃: Slows down by approximately 40%–60%
• -10℃: Slows down by approximately 60%–80%

For the first 5–10 minutes after plugging in, charging power may only reach 10%–20% of its normal-temperature capacity.

The slowdown is most severe, but can be significantly improved after preheating.

According to relevant charging performance studies by SAE International, the degree of charging speed reduction in low-temperature environments is positively correlated with the charging power level: DC fast charging is most affected, followed by Level 2 AC charging, and Level 1 home charging is least affected.

The following is a comparison of typical speeds for DC fast charging (20%–80%) at different temperatures:

4. How does cold weather affect electric vehicle charging?

Battery Performance

Low temperatures directly reduce overall battery performance. The rate of chemical reactions inside the battery decreases, the migration speed of lithium ions slows down, and the internal resistance of the battery increases significantly, leading to a substantial reduction in charging acceptance capacity.

Increased Use of Heating Systems

When driving in cold weather, EVs also use energy for battery preheating and insulation. This extra energy draw slows charging speeds and increases how often you need to recharge.

Different Driving Conditions

In cold weather, users typically:

• Stop the car before the battery has warmed up during short trips.
• Frequently use the heater, seat heating, and steering wheel heating.

These factors keep the battery in a low-charge, high-load state for extended periods, further reducing charging efficiency and preventing each fast charge from reaching its peak power.

5. How to Precondition EV Batteries for Winter?

The most crucial and effective preparation for EV batteries in winter is battery preconditioning: by preheating the battery, it is kept at its optimal operating temperature, which significantly improves charging speed and reduces the impact of low temperatures on battery life.

Preconditioning before charging:

• When using the in-car navigation to go to a DC fast charging station, the electric vehicle will automatically preheat the battery.
• Upon arrival, the battery will already be at its optimal temperature, allowing for normal charging.

Preconditioning before departure:

• Use the mobile app to remotely preheat the battery and the cabin.
• The vehicle draws power directly from the grid for heating, without consuming battery power, ensuring optimal operating temperature from the start.

Preheating while plugged in:

• When parked for extended periods in winter, keep the vehicle plugged into a home charging station (Level 2).
• The vehicle will automatically maintain the battery temperature, ensuring that charging and driving the next day are not affected by low temperatures and protecting the battery.

6. Tips for Using Electric Vehicles in Cold Weather

Park in sheltered and warm locations whenever possible

• Prioritize parking in garages or underground parking lots to reduce battery drain due to low temperatures.
• Use a car cover on rainy or snowy days to mitigate rapid temperature drops caused by extreme weather.

Drive smoothly

Low temperatures reduce battery output capacity; smooth driving can significantly improve range.

Plan your trip in advance

• Plan your route in advance using your car’s infotainment system or app to identify charging stations along the way and avoid running out of power.
• Allow more charging time than usual, as fast charging speeds may be more than halved in low temperatures.

Make full use of heat pump technology

• Heat pumps are more efficient and consume less power than traditional PTC heaters, significantly improving winter range.
• In low temperatures, try to use automatic climate control and economy/heat pump mode to reduce energy waste.

Charge to a higher battery level in winter

• For daily commutes, increase the charging limit to 90% to increase available range.
• Charge to 100% before long trips to reduce the number of charging stops.

Maintain your electric vehicle

Perform a comprehensive inspection before winter to ensure smooth operation:

• Check tire pressure; low temperatures can cause tire pressure to drop, and insufficient tire pressure increases energy consumption.
• Confirm that the battery thermal management, heat pump, and air conditioning heating functions are working correctly.
• Check brakes, tires, windshield washer fluid, coolant, etc.

Conclusion: Although cold weather may cause some inconvenience when charging electric vehicles, they can still operate normally in winter. With technological advancements, the impact of cold weather on electric vehicles will gradually decrease. If you need a charger for home or on-the-go use, please contact us; Zencar will provide you with personalized recommendations.

7. FAQ

7.1 How Cold Is “Too Cold” for an Electric Vehicle?

Electric vehicles start to be affected when the temperature drops below 0°C, significantly affected below -10°C, and considered too cold below -18°C (0°F).

7.2 Will long-term exposure to low temperatures harm electric vehicle batteries?

Long-term exposure of electric vehicle batteries to extremely cold environments (especially below -10°C) will accelerate battery aging, increase the risk of charging damage, and result in poorer range and charging speed.

7.3 What should I do if my connector or charging port cover is frozen?

Prioritize using vehicle preheating, warm water to melt the ice, and soft tools for cleaning. Wait patiently for it to thaw.  Avoid using force or boiling water, as these can cause permanent damage.

7.4 Are Electric Vehicles Practical to Drive in Winter?

Electric vehicles are perfectly usable in winter, although the range will be shorter and charging will be slower. 

7.5 What should I do if my electric vehicle won’t charge in cold weather?

In cold weather, 90% of the time, the reason an electric vehicle won’t charge is due to battery low-temperature protection or ice formation on the charging port:

Frozen connector → Preheating + slightly warm water + gentle de-icing

Battery too cold → Drive to warm it up, use the app to preheat, or park in a warm place.

7.6 Is it unsuitable to charge electric vehicles in very cold weather?

Electric vehicles can be charged even in very cold weather, but when the battery temperature is too low, it’s not suitable for direct high-power DC fast charging. This is not only extremely slow but may also affect battery life.

7.7 Which car models are best suited for driving in snow?

For driving in snow, prioritize models with dual motors and all-wheel drive, snow mode, a heat pump, and mature thermal management systems; SUVs have a higher center of gravity and are more stable, while sedans offer better handling but should be equipped with snow tires.

7.8 How to maximize range in winter?

Preheat before departure, use seat heating more and the heater less, drive smoothly, utilize the heat pump effectively, maintain tire pressure, park in a warm place, and plan your trips. 

7.9 How to improve electric vehicle charging speed in cold weather?

By preheating the battery, charging in a warm environment, and maintaining a reasonable battery level, charging time can be significantly reduced, approaching the efficiency of charging at normal temperatures.

7.10 Is slow charging or fast charging better in winter?

For daily use at home, prioritize Level 2 slow charging, which is gentler and helps maintain battery temperature; for long-distance travel emergencies, use DC fast charging, but try to preheat the battery before charging.