How to Choose Right Lithium Battery for Your E-bike Product?

With the development of technology, lithium batteries have become inseparable from people’s lives and are widely used in electric vehicles. In this article, we will talk about the application of lithium batteries in electric vehicles. Many electric vehicle designers fall into a misconception when choosing lithium battery parameters for electric vehicles: they only focus on the voltage and capacity of the lithium battery. For example, you may wonder if the design of this electric vehicle project should be equipped with 36V or 48V? Should the capacity be 12Ah or 20Ah? Is the output power 300Wh, 400Wh, or 500Wh? Some designers may blindly pursue high range by simply looking at the range after a single full charge. This is not advisable. In fact, when developing electric vehicle products, precise positioning is made based on the product’s purpose and riding environment, and different capacities of lithium batteries are configured according to different positioning… Below, the editor will provide a brief explanation based on different vehicle models and purposes to provide reference and assistance for everyone.

Why Choose Lithium Batteries?

With the popularization of electric vehicles and the rise of high-end intelligent assisted bicycles, more and more lithium batteries are being recognized and purchased by consumers. This also indicates that consumers prefer high-quality and cost-effective products, so when equipping electric vehicles with batteries, lithium batteries are the best choice! Lithium batteries are inseparable from people’s lives and are widely used in electric vehicles.

Advantages of lithium batteries:

1. Lithium batteries are more powerful in the initial stage compared to lead-acid batteries;
2. The weight of a lead-acid battery with the same capacity specification is about 1/2-1/3 of that of a lead-acid battery;
3. Lithium batteries are less affected by external environmental factors;
4. The lifespan of charging and discharging cycles is about 2-3 times that of lead-acid batteries;
5. Lithium batteries contain no harmful heavy metals to the human body, making them more friendly and environmentally friendly to the human living environment!

Lithium batteries have better advantages than lead-acid batteries, but of course, they are also more expensive than lead-acid batteries. When equipping with lithium capacity and range, designers can choose the appropriate lithium battery capacity based on the predetermined cycling purpose and range requirements of the project, reducing unnecessary expenses and also reducing the overall weight of the battery and electric vehicle. Consider the installation space and weight of the battery to ensure a perfect match between the battery and the electric vehicle. Understand the charging speed, cycle life, and range degradation of batteries, and choose batteries with stable and durable performance.

How to Choose?

Below, we will explain how to assemble lithium batteries for electric vehicles based on the general usage of customers.

According to their usage purposes, they generally include daily commuting or urban mobility, suburban leisure and entertainment, sports and fitness, land exploration, off-road exploration, and mountain conquest, among others. Cycling environment: flat paved roads, undulating suburban terrain, mixed roads, wild forest paths, and steep mountain trails

For Examples

Urban commuting electric vehicle: Choose a 48V battery with a capacity of around 20Ah, which is sufficient to meet daily short distance commuting needs.
Suburban electric bike: Consider 60V or 72V batteries with a capacity of 30Ah or higher to increase the range.
High performance electric vehicles: using high-power motors and large capacity lithium batteries to enhance speed and acceleration performance.
In summary, when choosing a battery, multiple factors such as voltage, capacity, type, motor power, and battery size need to be considered to ensure that the battery can perfectly match your electric vehicle model and meet your usage needs.

1. Voltage
The battery voltage of electric vehicles usually has options such as 48V, 60V, and 72V. The higher the voltage, the greater the driving force of the motor, and the corresponding higher the vehicle speed. For example, 48V batteries are suitable for daily commuting, urban mobility, suburban leisure and entertainment on flat paved roads. 60V and 72V are suitable for cycling that requires greater driving force or higher speed, such as sports and fitness, land exploration, off-road exploration, and mountain conquest.

2. Capacity
The capacity of a battery is usually expressed in ampere hours (Ah), such as 12Ah, 20Ah, etc. The larger the capacity, the more energy the battery can store and the longer the range. Choose the appropriate capacity based on daily driving needs. The range is related to the capacity of the lithium battery. The current (ampere hours, Ah) and battery capacity determine the range of an electric vehicle. Generally speaking, a higher current (ampere hours) will provide a higher range of endurance. You can choose the appropriate current and capacity based on the distance that the electric vehicle needs to travel.

For example:
For 48V electric vehicles, equipped with 12Ah batteries, the range is about 30 kilometers; The range of 20Ah is about 40-50 kilometers.
For a 60V electric vehicle, a 20Ah battery has a range of about 50-60 kilometers, a 32Ah battery has a range of about 90-100 kilometers, and a 35Ah battery has a range of about 100-110 kilometers.
For a 72V electric vehicle, a 20Ah battery has a range of about 60-70 kilometers, a 23Ah battery has a range of about 80-90 kilometers, a 32Ah battery has a range of about 110-120 kilometers, a 35Ah battery has a range of about 130-140 kilometers, and a 38Ah battery has a range of about 150-160 kilometers.

3. Battery type
Lead acid batteries: Low cost, high safety, but heavy and not suitable for high-performance electric vehicles.

Choosing well-known brands of lithium batteries can ensure the quality and safety of the batteries. Famous brands such as CATL provide reliable battery performance guarantees. Of course, DNK POWER can also provide high-quality batteries and first-class professional services
Lithium batteries: high energy density, light weight, small size, long lifespan. Although the initial cost is higher, it is more cost-effective in the long run.

4. Motor Power
The motor power directly affects the maximum speed and acceleration of electric vehicles. High power motors require larger capacity batteries to provide sufficient current. If you need higher performance, such as faster acceleration or higher vehicle speed, you should choose a higher power motor and corresponding capacity battery to meet the high power requirements of undulating suburban terrain, mixed roads, mountain forests, and steep mountain trails.

5. Size of battery compartment
When choosing lithium batteries, it is necessary to consider whether the size of the battery is suitable for the space reserved for the battery during the design process. Different car models have different battery compartment sizes to ensure that the selected batteries can be adapted. Consider the installation space and weight of the battery to ensure a perfect match between the battery and the electric vehicle. If you have special needs, DNK POWER can meet them as much as possible. We often make some irregular batteries.

Understand the charging speed, cycle life, and range degradation of batteries, and choose batteries with stable and durable performance.
Through the above steps, you can choose the appropriate lithium battery size according to your personal needs and the specifications of the electric vehicle.

Choosing well-known brands of lithium batteries can ensure the quality and safety of the batteries. Famous brands such as CATL provide reliable battery performance guarantees. Of course, DNK POWER can also provide high-quality batteries and first-class professional services