With the arrival of winter, many electric vehicle users encounter the problem of reduced battery range, a problem plaguing the new energy vehicle industry.
The impact of low temperatures on battery performance is multifaceted, involving factors such as chemical reaction rate, electrolyte fluidity, and increased energy consumption. What factors affect car battery packs?
I. Reasons for Reduced Battery Range in Winter
1. Decreased Battery Performance
In low temperatures, the energy storage capacity of lithium batteries decreases significantly. This is mainly because the activity of lithium ions decreases, the fluidity of the electrolyte deteriorates, leading to a slower chemical reaction rate. Furthermore, the battery pack needs continuous heating to maintain its performance, which also consumes some electricity.
2. Increased Energy Consumption
Electric vehicles generally experience increased energy consumption in winter. On the one hand, the demand for air conditioning heating increases, causing electric vehicles to consume more electricity for heating. On the other hand, comfort features such as heated seats and steering wheel heating also increase energy consumption.
3. Increased Wind Resistance and Transmission System Drag
As temperatures drop, air density increases, leading to a higher drag coefficient, which in turn increases the energy consumption of electric vehicles. Meanwhile, the lubricating grease in the transmission system becomes more viscous at low temperatures, affecting its efficiency and further increasing drive power consumption.
Once the specific causes are identified, what are our coping strategies?
II. Strategies to Reduce Car Battery Range Decrease in Winter
1. Optimize Charging Habits
Extend Charging Time Appropriately: In winter, the active materials in the battery react more slowly, requiring a longer charging time. It is generally recommended to charge for 8 to 10 hours, or continue floating-charging for a while after the charger's green light illuminates. However, be careful not to exceed 12 hours to avoid damaging the battery.
Choose a Warm Location for Charging: Avoid charging in low-temperature outdoor environments. Choose a warm and dry place to charge to improve charging efficiency and battery activity.
2. Preheat the Battery
In cold weather, battery preheating is an important energy-saving measure. Preheating the battery can improve its activity, speed up charging, and extend the driving range. Some new energy vehicles are already equipped with a battery preheating function, which users can activate before driving via an app or vehicle system.
3. Adjust Driving Style
Drive Smoothly: Smooth driving can reduce the energy consumption of electric vehicles. Avoid aggressive driving behaviors such as sudden acceleration and braking. Try to maintain a constant speed. Acceleration will cause the battery to output a large current instantaneously, increasing power loss.
Economy Mode: For new energy vehicles, the economy mode can be selected for driving to maximize energy savings.
4. Utilize Auxiliary Heating Facilities Rationally
In winter, compared to relying on air conditioning for heating, heated seats and steering wheel provide more direct and efficient comfort, and their energy consumption is relatively low. Therefore, these auxiliary heating facilities can be used more often to reduce performance degradation caused by low temperatures, while also appropriately lowering the air conditioning temperature setting.
5. Maintain Proper Tire Pressure
Stable tire pressure allows for longer riding distances in electric vehicles. Sufficient tire pressure reduces the contact area between the tire and the ground, thereby reducing rolling resistance and saving energy. It is recommended to check tire pressure regularly to ensure it is at the appropriate level.
6. Utilize Regenerative Braking
When decelerating or going downhill, utilize the regenerative braking function of the electric vehicle to recover some energy. This not only improves vehicle energy efficiency but also extends battery range.
7. Regular Vehicle Maintenance
Regularly have your vehicle checked at a professional 4S service shop or repair station for battery charge balance, coolant level, etc., to ensure the battery is in good working condition.
The table below compares the effectiveness and ease of use of different strategies in improving battery life:
| STRATEGY | BATTERY LIFE IMPROVEMENT | OPERATIONAL DIFFICULTY |
| Optimize Charging Habits | Quite good, it can improve battery life by 10%-15% | Low, extend charging time |
| Preheat the Battery | Quite good, it can improve battery life by 10%-20% | Low, can be operated remotely |
| Adjust Driving Style | Quite good, it can improve battery life by 10% | Middle, it is necessary to change driving habits |
| Utilize Auxiliary Heating Facilities Rationally | Generally, it can save 5%-10% of electricity | Low, just pay attention to settings and usage habits |
| Maintain Proper Tire Pressure | Generally, it can save 5%-10% of electricity | Medium, tire pressure requires regular checks |
| Utilize Regenerative Braking | Generally, it can save 8%-11% of electricity | Low, automatically recovers energy when slowing down or going downhill |
| Regular Vehicle Maintenance | The long-term effects are significant, maintaining battery performance | Middle, it needs to be done at a professional store |
