There are generally five main types of lithium-ion battery failures in electric vehicles: overcharging, over-discharging, overcurrent, uneven charging, and the impact of ambient temperature on battery life. These problems can cause serious damage to lithium-ion batteries and may even lead to explosions. Therefore, it is crucial to pay close attention to lithium-ion batteries during use and to perform regular maintenance.
Repair methods for lithium-ion batteries in electric vehicles
1. Re-grouping: After the entire battery pack is damaged, we often perform charge and discharge tests on the lithium-ion batteries of electric vehicles. During the inspection, we often find that 50% of the batteries in a group are not damaged. The reason is that in the series-connected battery pack, the failure of individual batteries causes the overall battery pack's function to deteriorate, resulting in a decline in the overall battery pack's performance.
2. Water Replenishment: Replenishing water on a lithium-ion battery in an electric vehicle after approximately four months of use can extend its lifespan by an average of three months or more. It should be noted that each water replenishment process involves overcharging the battery, transitioning it from a near-starved state to a starved state. This overcharging is beneficial for increasing battery capacity.
3. Desulfation: Battery repair equipment is used to desulfate the batteries.
4. Microparticle generator: A microparticle generator is connected in parallel to the battery to repair it. This method is good for repairing lithium-ion batteries in electric vehicles. However, because the repair is quite thorough, it often completely eliminates the possibility of battery sulfation for electric vehicle lithium-ion batteries that are not over-discharged and are intended for continued use.
5. Comprehensive Repair Methods for Lithium-ion Batteries in Electric Vehicles: Regularly inspect electric vehicle lithium-ion batteries, promptly desulfurize and replenish water, charge individual batteries, and reassemble battery packs. Battery manuals state that if the battery is maintenance-free, generally do not add water. If water must be added, first check the electrolyte density of the electric vehicle battery and select the appropriate concentration or no water as needed. This will increase battery capacity or extend its lifespan.
What are the common faults of lithium-ion batteries in electric vehicles?
● The electric vehicle has no display, the battery has no output, and the battery cannot be charged;
● Problems caused by faulty lithium-ion battery chargers, such as failure to charge, incomplete charging, unchanged charger indicator light, or shorter/longer charging time;
●The lithium-ion battery voltage is normal, but the power cuts off after a very short riding distance, and then resumes riding after a short rest, exhibiting an intermittent cycle.
● Damage to the lithium-ion battery protection board itself can cause the lithium-ion battery to malfunction, or damage to some battery cells can result from the battery protection board not working.
There are five major problems with lithium-ion batteries in electric vehicles that you should be aware of.
1. Overcharging can cause the battery to swell;
2. Over-discharging will damage battery life, and the damage is irreversible;
3. Excessive current during discharge can also damage the battery, and this damage is irreversible.
4. Lithium-ion battery packs for electric vehicles are composed of multiple cells connected in series and parallel. The consistency of the cells is very important. Although the manufacturers have matched the cells, the voltage of each cell in the battery pack will be inconsistent due to the error of the cells during long-term use. This will cause the energy output of the entire battery pack to decrease, and then problems such as sudden power outage, sudden reduction in range, incomplete charging, and incomplete discharging will occur.
