How to choose the capacity of lithium batteries for new energy vehicles.
There are several key points to pay attention to in order to help you make a choice regarding this issue.
Firstly, for daily urban driving, batteries with a capacity of 20-30kWh are sufficient to meet daily usage needs.
Secondly, for long-distance and longer trips, it is recommended to choose batteries with a capacity of 40kWh or more to ensure sufficient range and reliability.
Finally, it is important to choose the appropriate vehicle model and battery combination to fully unleash its potential and effectiveness.
In summary, choosing a battery capacity that suits your needs and budget is very important. We suggest that you consider various factors comprehensively and make a wise choice.
In terms of functionality, the capacity of lithium batteries is usually related to the following parameters:
1. Charging time
As the capacity of lithium-ion batteries in electric vehicles increases, the amount of stored electrical energy also increases accordingly. At present, the storage capacity of lithium-ion batteries in electric vehicles is usually between 30 to 100 degrees Celsius. The battery capacity of the Faraday FF91 model is as high as 130 degrees. However, it should be noted that according to the formula of work=power * time, most of the power of an ordinary home Charging station is only 3.3kw or 7kw. This means that it takes 37 or 18.5 hours to fully charge the Faraday battery, which cannot meet the fast charging needs. The fast charging specifications include 30kw, 60kw, and 120kw, and the charging time also decreases accordingly. Taking the FF91 with a capacity of 130 degrees as an example, if it runs out of electricity on the first day, it needs to be charged at home for 14 hours, and can only be charged up to 98 degrees. If the driving distance is the same the next day, only 70 kWh of electricity can be used. This can lead to partial battery waste, but it has some significance during long-distance driving.
The charging time of electric vehicles means that the battery capacity should not be too large when charging under the household Charging station, which may lead to misunderstanding in actual use, for example, it takes two nights to fully charge. Therefore, considering the specifications of the existing household Charging station, the battery capacity of the household electric vehicle should not exceed 100 degrees.
If the charging capacity does not exceed 100-kilowatt hours, it means that some plug-in hybrid vehicles cannot drive for long distances, which greatly limits the driving radius of electric vehicles. Therefore, electric vehicles can only be used in cities.
2. Cell current per unit mass
Under the same output power conditions, the current of a single battery pack using 10 100V battery packs in parallel is 10 times that of a single battery pack using 100 100V battery packs in parallel. For a single battery pack, if the charging and discharging current is small, it will be safer and the damage to the battery will be smaller. Generally speaking, the smaller the unit mass current of a battery cell, the better. In situations where electric vehicles require higher power output, lithium batteries with larger capacities perform better.
Simply put, the storage capacity of a lithium battery is equivalent to the fuel tank capacity of a traditional car, and the larger the capacity, the more electricity can be added. However, the added battery level does not directly reflect the length of the range. For example, some cars require 6 liters of fuel every 100 kilometers, while others require 12 liters of fuel. Overall, when the weight of the vehicle is equal, the larger the capacity, the longer the range. From this point of view, electric vehicles themselves have the problem of “Range anxiety”, so when purchasing electric vehicles, you should try to choose the ones with larger capacity.
The fourth point indicates the maximum output power and acceleration performance of the product at 100 meters.
Lithium batteries have a high capacity, and their output power can be obtained by multiplying the output current and voltage. Therefore, the larger the capacity, the higher the output power. If the weight of the vehicle is the same, the larger the capacity of the lithium battery, the higher the maximum output power and better acceleration performance.
Article 5 refers to the weight of the vehicle.
As the capacity increases, the weight of lithium batteries will also increase accordingly, and the overall weight of the vehicle will also increase accordingly.
Undoubtedly, an increase in capacity will lead to an increase in costs.
An increase in the number of batteries can lead to an increase in battery capacity, but the larger the capacity, the safer it is.
Moreover, in the event of a fire, the excess capacity of a large-capacity electric vehicle can cause other nearby objects to be burned.
In terms of the current specifications of electric vehicles on the market, the range is about 250 kilometers and the battery capacity is between 40 and 60 kilowatt hours. When considering capacity, use the best dimension as the criterion for excellence. That is to say, the larger the battery capacity, the better.
For tycoons, it is recommended that the battery capacity should not exceed 100 degrees.