Technical information of e-bike battery charge and discharge characteristics

Discharge and charge current is the key specification, today we will explain both settings and how they related to the cell type. Also, what happens when a battery is discharged.

36v 5ah pack

The technical definition of electric bike battery discharge is the electric potential difference between the battery terminals and end-of-discharge voltage.

The discharge current is usually constant, which will cause a linear decrease in the battery’s capacity.

The total energy that can be extracted from the battery during discharge depends on how long it can sustain a given discharge current without damaging or excessively heating the battery.

Batteries are designed to operate within a specific voltage range, and going beyond this can cause damage.

A battery that is discharged at too high a current will heat up more than one discharged at a lower current. This is why it’s important to know both the maximum discharge current and end-of-discharge voltage for your battery.

Max discharge rate of the cell, and battery voltage. How are they related to battery life and performance?

The max discharge rate of a cell is the highest current that the cell can be safely discharged at. However, The max discharge rate of a pack must be lower than the max discharge rate of a cell.

For example, a battery pack with 10S1P. The maximum discharge rate of the cell is 10A. Then, the maximum discharge rate of a pack must be lower than 10A.

That is because the maximum discharge of cells is usually tested with a single cell. But as a pack, the heat will not dissipate as well, so the max discharge rate of a pack must be lower than the cell.

The discharge current is the most important parameter when it comes to battery life and performance. It affects how long the battery can sustain a given load, and also how much power the battery can provide.

Batteries that are discharged at a too high rate will heat up more than those discharged at lower rates, which can lead to damage and affect the lifetime of the battery.

What are the effects of over-discharging and undercharging lithium-ion batteries?

Undercharging a battery can also cause damage, as it will not receive enough energy to maintain its optimal state. This can lead to a decrease in performance and shortened battery life.

The standard voltage of each cell in a lithium-ion battery usually is 3.6V, and the fully charged voltage is 4.2V. When each cell voltage drop under 2.6V, it is time to recharge the battery. If the voltage continues dropping, under 1.5V, the cell will be damaged.
The BMS (battery management system) will trigger the over-discharge protection, to stop the battery from discharging.

When the individual cell is over-discharged under 1.5V, it will cause irreversible damage to the cell. Over time, the difference in each cell’s performance will get more and more, and cause dangerous accidents.

电池过放app截图

In short, over-discharging and undercharging will both cause damage to the e-bike battery, which can lead to reduced performance and shortened battery life. It is important to be aware of the max charge and discharge rates for your particular battery so that you can avoid these issues.

E-bike battery discharge characteristics 

The discharge characteristics of an e-bike battery refer to the voltage and current curves as the battery is discharged. This information can be used to determine how much power the battery can provide at different points in time.

The discharge curve shows how the voltage and current change as the battery is discharged. It is usually graphed as a voltage vs. current chart, with the voltage on the y-axis and the current on the x-axis.

The shape of the discharge curve depends on several factors, including:

  • The type of cells used in the battery
  • The capacity of each cell
  • The max discharge rate of each cell
  • The wiring configuration of the pack
rate discharge curve

By understanding these factors, you can use the discharge curve to determine how much power the battery will provide at different points in time. This can help size and design circuits, or for estimating how long the battery will last under a given load.

When it comes to e-bike batteries, it is important to know both the maximum discharge current and end-of-discharge voltage. By understanding these characteristics, you can ensure that your battery is used safely and effectively.

Maximum Discharge Currents & End of Discharge Voltages

It is important to be aware of the maximum discharge current and end-of-discharge voltage for your e-bike battery. This information can help you avoid damaging the battery by discharging it at too high a rate or undercharging it.

The maximum discharge current is the amount of current that the battery can provide at its peak. This should not be exceeded, as it can cause damage to the cells and reduce the lifetime of the battery.

The end-of-discharge voltage is the voltage at which the battery will no longer provide power. When this voltage is reached, the battery should be recharged immediately.
By understanding these parameters, you can safely use your e-bike battery without damaging it. Be sure to check the specs for your particular battery to find out its max discharge current and end-of-discharge voltage. With this information, you’ll be able to use your battery confidently and safely!

How to store an e-bike battery for long-term use?

Batteries should be stored in a cool, dry place. If possible, store them at a temperature of around 20 degrees Celsius. Batteries should also be stored in an airtight container to prevent moisture from damaging the cells.

It is also important not to store batteries in a place where they will be exposed to extreme temperatures, as this can cause damage and affect the performance of the battery.

The SOC (State of Charge) meter will help you keep track of the battery’s status.
When storing the battery for a long turn. Don’t forget to charge the battery from time to time. At least once in three months is good. This will help the battery last its longest possible lifetime.

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By following these simple tips, you can get the most out of your e-bike battery and ensure that it lasts for many years to come!

Electric bike battery

Tritek is a professional OEM of LEV battery, which is with more than 12 years of experience. we design and produce the complete intelligent lithium battery pack for electric mobility, including the smart BMS and battery, with world-leading facilities, and automatic and semi-automatic assembly lines.

Our customer-oriented approach and suite of proprietary lithium batteries let riders build their unique, individualized and outstanding ride experience, and your electric bike company will stand out in the marketplace for it.


Read more:

  1. Lithium Battery Performance at Low Temperature
  2. What is a BMS protection board of lithium battery?
  3. How to choose a charger for e-bike?

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