Ebike Lithium Battery

Higher energy density
One of the core appeals of lithium-ion batteries is their exceptional energy density: Compared to other rechargeable battery technologies, lithium-ion batteries can store more kilowatt-hours of energy in a more compact and lightweight package.

This feature directly translates into longer range for electric bikes and scooters after a single charge, so travel is no longer limited by distance.

Efficient charging
In most cases, the battery packs of electric bicycles and electric scooters can quickly transition from low power to full power in just 3 to 5 hours , far exceeding the 8 to 12 hours required for traditional lead-acid batteries. Such high charging efficiency greatly shortens the waiting time.

Longer cycle life
Under the correct maintenance and use conditions, lithium batteries can withstand more than 500 complete charge and discharge cycles, and their capacity can still remain at more than 80% of the initial state . For daily commuters, a lithium battery is enough to support years of reliable riding, greatly reducing the frequency and cost of battery replacement, and providing users with a more economical and environmentally friendly travel option.

Higher peak output
When powered, lithium-ion batteries can quickly reach and maintain high peak power output, which is critical for vehicle performance in high-load scenarios such as acceleration and climbing. This immediate power response ensures that the rider experiences a strong and sensitive acceleration feeling, making the ride smoother.

Voltage stability
During battery use, the voltage of lithium batteries changes relatively slowly, and even as the battery gradually consumes, it can maintain a relatively stable power output. This feature helps provide a continuous, non-attenuated riding experience and ensures that the electric vehicle can maintain stable performance when the battery is reduced.

Low self-discharge characteristics
Compared with other rechargeable batteries, lithium batteries have a significant advantage of low self-discharge. If not used for 30 days, the power loss can be as low as 1%. This feature is particularly important for electric vehicles that need to be parked or used as standby for a long time, ensuring that the vehicle is always available.

Safety mechanism
Each lithium battery cell contains independent protection circuits that monitor voltage, current and temperature. They can isolate damaged or faulty cells to prevent a chain reaction.

To avoid overheating during charging or high loads, the lithium battery pack is equipped with temperature sensors, vents and fire-proof enclosures to reduce the possibility of thermal runaway caused by internal short circuits.

Material mixing
Making a slurry is the first step of battery production. Materials are measured, added, and mixed.

Active materials are combined with binder, solvent, conductive additives, etc. Like a flour kneading machine, the planetary ball mill mixes the active materials. To make sure the mixed active material particles stick together well, we need a material that can hold them together.

Binders are added to improve adhesion between the particles of electrode active materials. It must have stable properties that could maintain good adhesion when in contact with electrolytes or during redox reactions at electrodes.

Coating and drying
The coating process uses a coater (a coating machine) to coat aluminum and copper foils with the cathode and anode slurry layers, respectively. It is an important step that determines many cell design parameters like uniform performance and longer battery life.

In order to prevent damage to aluminum and copper current collectors (or foils) when coating the electrodes, controlling the roll-to-roll machine and coating electrodes evenly and uniformly are critical.

After coating, these wet layers still need to be dried thoroughly before being ready for the next phase. This process of drying by heating or vacuum takes up to 48% of the entire battery manufacturing process.

Pressing
The roller pressing phase compacts the dry and coated electrode sheet again in order to increase the energy density of the battery. Appropriate compacted density can increase battery capacity, reduce internal resistance, reduce loss of polarization, and extend battery cycle life.

The flatness of the electrode sheet after calendaring will directly affect the processing effect of the slitting process. The evenness of the active material on the electrode sheet will also affect the performance of the battery cell.

Slitting and notching
The electrode flattened in the pressing process is still a hundred(s) meters long.

In the slitting phase, the battery electrode is cut to the right battery size. The two-phase process includes first cutting the electrode vertically (slitting) and then making a V-shaped notch and tabs to form positive and negative terminals (notching).

In notching, uncoated parts where cathode and anode active materials are not applied are cut out using notching devices, leaving the corners where tabs will be grounded.

Stacking and winding
In the assembly process, the method of stacking the plates and the order of injecting and sealing the electrolyte are all different depending on the shape of the battery.
​​The method of stacking the plates: Stacking(pouching), Winding(Cylindrical).

The winding method is similar to how roll tissue paper is made. It has the advantage that the process speed is fast, just like you can quickly wind toilet paper around a paper roll.
​​​​​On the other hand, the stacking method is a method of stacking battery cells one by one. It requires higher technology than the winding method but has the advantage of being less warped between cells and increasing the energy density without empty spaces in the battery cells.

Filling and formation
Pouch: When battery ingredients made through lamination and stacking methods are put into the electrode pocket, the electrolyte is injected into the air pocket reaching pores in the electrode pocket. This process creates gas in the air pocket, which is removed later through degassing.

Cylindrical: A vacuum state is created inside of the can and the required amount of electrolyte is injected into it through a nozzle. The can is pressed to let the electrolyte fill the pores of the electrode. When this process is over, the last process is to crimp the top cap and the can.

Aging and charging
The batteries are stored at room temperature so that the electrolyte injected during the assembly process can permeate well into the positive and negative electrodes of the battery. The electrolyte is evenly distributed inside the battery to ensure smooth movement of ions between the anode and cathode.

At the same time, the batteries are continuously charged and discharged to create a stable battery, and is the perfect quality control method.

The process of storing batteries at a certain temperature and humidity and charging and discharging is called aging.

Degassing
During aging and charging, gas is generated inside the battery. The gas is removed through the degassing process. After degassing - Aging and charging are repeated two more times to test the charging capacity and select defective batteries.

Pack assembly
This is the process of taking the individually manufactured battery cells and putting them into modularizing packs before final delivery to the Ebike manufacturers.

When getting a lithium ion battery for ebike, it is essential to consider the following factors:

1. Compatibility with your ebike
You need to pay attention to how compatible the lithium battery for ebikes is with your ebike. One compatibility test you should consider is the weight of the battery. Different batteries have different weights. If you are not a fan of heavy gadgets, you should choose lightweight ebike batteries. This will save you the stress of a purchase you would keep grumbling about.

It is also essential to consider the battery weight because of your ebike frame. Ebike frames have varying strengths. Using a heavy battery for a lightweight ebike frame could be an easy route to destroying the ebike.

2. Capacity and voltage
The battery capacity of an ebike is an indicator of the energy rating of the battery. A higher capacity means more range. A battery's range is the total distance it can travel with one full charge. By implication, a higher range means the battery can travel farther with one charge. For most batteries, the entire battery range cannot be used by the ebike. Hence, it is essential to take note of the depth of discharge the battery has. For example, a 100 ampere-hour Li-ion battery having a DoD of 0.78 means only a 78 ampere-hour charge of the battery can be used.

You should also look out for the lithium battery ebike's voltage. Every ebike comes with its distinct input volt range. Using a battery voltage that is higher or lower will harm the bike. A voltage higher than the recommended Voltage would damage the electrical components of the motor. On the other hand, using a lower voltage than that specified would not be sufficient to power the ebike motor.

3. Brand and warranty
Lithium batteries for ebikes have a good reputation. However, how well different batteries perform could be affected by the manufacturer of such batteries. Due to this, it is best to buy a Lithium battery from a reputable battery manufacturer. While making your purchase, watch out for the warranty as well. Warranties say a lot about the kind of confidence manufacturers have in their products. Most especially if you will be buying from a not so famous brand. Ensure you pay attention to the attached terms and conditions to make the most of the warranty.