Why is Your Motorcycle Lithium Battery Out of Wor

Electric vehicles can be seen everywhere in our daily lives. However, the lithium-ion batteries of electric vehicles will have certain failures during use. The new standards about lithium battery haf launched by the state in 2018 clearly stated that lead-acid batteries should be developed in the direction of lightweight and high-energy. Thus lithium-ion batteries have attracted more and more attention as an ideal energy source for the development of the 21st century. Many car owners believe that the decrease in battery life is the reason for this, but in fact, while the battery is lightweight, it also improves the high energy ratio inside the battery. This is the general trend of the industry, and it will not cause the range to be shortened and the battery will not be durable.In fact, the most critical impact on battery life is precisely the three bad charging habits of electric car owners, which have caused the battery to become less and less durable. Electric vehicles can be seen everywhere in our daily lives. Let’s discuss today why these failures occur and how to solve them.

Short riding mileage: There are many reasons for short riding mileage.

There are the following common ones：

  1. Low battery capacity: Excluding the service life, it is generally that one of the batteries has poor performance and its capacity becomes smaller. The solution is to replace this battery cell. Operation steps: Battery assembly, choose a battery with similar performance to other batteries to replace it, you need a capacity test cabinet, internal resistance meter, multimeter, spot welding machine and other equipment and instruments. The newly selected battery should be similar to other batteries in terms of capacity, internal resistance, voltage and other indicators.
  2. The battery is not fully charged: The lithium battery of an electric vehicle is composed of more than 10 single batteries. Due to differences between the single batteries, the voltage of one or more batteries will be lower than that of other batteries during use. When other batteries are fully charged during the charging process, these low-voltage batteries have not been fully charged, resulting in short riding mileage. The treatment method is: lengthen the charging time (12 hours per charge), and it will be greatly improved after several charges and discharges.
  3. The internal resistance of the battery becomes larger: Due to improper use or poor battery performance, the internal resistance of individual cells in the battery pack becomes larger. When in use, the voltage of this part of the battery will quickly become smaller, and the entire battery will stop discharging when the discharge protection voltage is reached. The treatment method is the same as item A.
  4. Low discharge platform: due to changes in the internal performance of the battery. The solution is to replace the battery.
  5. Changes in the use environment:due to the low ambient temperature, the seasonal riding mileage is short. The treatment method is: do not charge in a low temperature environment, but charge at room temperature, which will improve.

The battery is not charged: there are mainly the following points：

  1. The protection board fails: replace the protec

  2. tion board；
  3. There is a problem with the battery: one or more batteries in the battery pack have a high voltage, and there is a serious voltage difference. The solution is to replace these batteries.
  4. Charger failure: replace the charger
  5. The internal welding of the battery or the spot welding is not strong, the nickel sheet and the nickel-aluminum strip fall off: The treatment method is to return to the factory for re-spot welding and ultrasonic welding, and the open solder joints will be handled well.
  6. Other faults such as poor contact with the charging port, etc.

Non-discharge of the battery: There are five main reasons for the non-discharge of the battery：

  1. The fuse tube is burned, and the fuse tube of the same specification needs to be replaced. ；
  2. The protection board fails: replace the protection board；
  3. There is a problem with the battery: the voltage of one or more batteries in the battery pack is lower than the discharge protection voltage. The solution is to replace these batteries.
  4. The internal welding of the battery or the spot welding is not strong, the nickel sheet and the nickel-aluminum strip fall off: The treatment method is to return to the factory for re-spot welding and ultrasonic welding, and the open solder joints will be handled well.
  5. Other faults such as poor contact with the discharge port, controller failure, etc.

*What Kills Cells in Your Motorcycle Lithium Battery?

  1. Capacity drops

The internal structure of the key battery is mainly composed of four parts: positive electrode, negative electrode, diaphragm and electrolyte. Changes in the structure and morphology of each part can cause the attenuation of the battery capacity.

External factors that affect the capacity of lithium-ion batteries include temperature, charge-discharge voltage, self-discharge, discharge depth, and state of charge.

2. Abnormal voltage Over discharge & Over charging

Overcharging refers to the behavior of the battery continuing to charge after it is fully charged during a certain charging process.

Since the capacity of the negative electrode is higher than that of the positive electrode during the design, the gas generated by the positive electrode is combined with the cadmium generated by the negative electrode through the diaphragm paper.Therefore, under normal circumstances, the internal pressure of the battery will not increase significantly, but if the charging current is too large, or the charging time is too long, and the oxygen generated is too late to be consumed, it may cause the internal pressure to increase, battery deformation, leakage, and other undesirable phenomena.At the same time, its electrical performance will be significantly reduced.

After the battery has discharged the internally stored power, after the voltage reaches a certain value, continued discharge will cause over-discharge. The discharge cut-off voltage is usually determined based on the discharge current.Over-discharge of the battery may have disastrous consequences for the battery, especially high-current over-discharge, or repeated over-discharge has a greater impact on the battery.Generally speaking, over-discharge will increase the internal voltage of the battery, and the reversibility of the positive and negative active substances will be destroyed. Even if charging can only be partially restored, the capacity will be significantly attenuated.

3.High Internal Resistance

The internal resistance of lithium batteries is different at static and at work, and the internal resistance of batteries will also change in different environments. Of course, the size of the internal resistance of the lithium battery also determines the quality of the lithium battery.

4.Extraordinary Temperature

The reasons for the loss of capacity caused by low temperature placement are:

  • Low temperature exacerbates the rupture of the positive electrode.
  • Low temperature may cause the rotation of the positive electrode particles, causing it to detach from the binder and lose its electrochemical activity.

The researchers found that the battery was only placed at a low temperature for 48h, and then continued to stand at room temperature, followed by a capacity test.It was found that for batteries that stand at low temperature for a long time, when charging and discharging at a small magnification (slow charge), the capacity will be lost by 3.2%, but when charging and discharging at a large magnification (fast charge), the capacity will be lost by 6%.

5.High Temperature

The performance of lithium batteries at high temperature and high discharge magnification will be significantly attenuated.This is because when lithium-ion batteries are used under high temperature conditions and at high currents, they will cause the decomposition of the positive electrode active substance and electrolyte. This is an exothermic process. The short-term release of heat can cause the battery’s own temperature to further increase, and the increase in temperature accelerates the decomposition phenomenon, forming a vicious circle, which accelerates the decomposition and further degrades the battery’s performance.Therefore, if the thermal management of the battery pack is not correct, it will bring irreversible performance loss

6.Poor Consistency

Inconsistent battery capacity will cause inconsistent discharge depth of each single battery in the battery pack.Batteries with smaller capacity and poor performance will reach a full state of charge in advance, causing batteries with large capacity and good performance to fail to reach a full state of charge.Inconsistent battery voltage will cause the single batteries in the parallel battery pack to charge each other, and the higher voltage batteries will charge the lower voltage batteries, which will speed up the attenuation of battery performance and consume the energy of the entire battery pack.A battery with a large self-discharge rate loses a lot of capacity. Inconsistencies in the battery’s self-discharge rate will lead to differences in the battery’s state of charge and voltage, which will affect the performance of the battery pack.

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