What are the reasons for power battery failure in pure electric vehicles?

[SanEmery]

Reasons for power battery failure in pure electric vehicles: 1. Low SOC of individual battery cells and high SOC of individual battery cells. If the SOC of an individual battery cell is low, its voltage will be the first to reach the discharge cutoff voltage during vehicle operation, reducing the actual capacity of the battery pack. In this case, the individual battery cell should be charged; 2. Severe battery performance degradation, which requires immediate replacement. The power battery is the power source that provides energy for tools, mainly referring to the batteries that power electric vehicles, electric trains, electric bicycles, and golf carts. Power batteries often use valve-regulated sealed lead-acid batteries, open tubular lead-acid batteries, and lithium iron phosphate batteries.

[LeilaniLee]

I've been driving a pure electric vehicle for several years and have encountered battery failure issues. The main reasons include capacity degradation due to natural battery aging, which is similar to how a smartphone's battery life deteriorates over time. Frequent overcharging, especially using fast charging, can increase internal battery pressure and cause damage. Temperature management is also a significant issue. Parking in direct sunlight during hot summers can cause the battery to overheat and accelerate degradation, while in winter, performance drops and cold starts become difficult. Additionally, manufacturing quality issues or physical impacts that damage the protective layer can lead to short circuits. I believe regular maintenance, such as avoiding full charge-discharge cycles and periodically checking the cooling system, can significantly reduce the risk of failure. Electric vehicles are quite convenient, but the battery is the core component and requires careful attention.

[MacIan]

As someone quite interested in electric vehicle technology, I understand that power battery failures often stem from Battery Management System (BMS) malfunctions. If it fails to balance the voltage across individual cells, it can easily lead to overcharging or over-discharging of certain batteries, resulting in overall performance degradation. Additionally, the chemical structure of lithium batteries degrades over time, especially when operating in extreme temperatures where overheating or excessive cold accelerates internal material changes leading to failures. Physical damage such as impacts and vibrations causing internal short circuits is also a common cause. I recommend fellow car enthusiasts to pay more attention to vehicle diagnostic reports and detect voltage abnormalities early to avoid being stranded on the road.

[SabrinaLynn]

I'm particularly concerned about vehicle safety. The potential risks of power battery failures in pure electric vehicles are significant, which may lead to thermal runaway or even fire due to improper charging, especially when using incompatible fast-charging equipment or aging wiring with leakage. Another cause is the failure of BMS monitoring or cooling system blockages, resulting in excessive temperatures that damage the battery structure. Additionally, daily usage such as frequent overload driving or parking on uneven ground causing vibration damage can also be hazardous. Prevention is crucial, such as parking in shaded areas to maintain ventilation and seeking immediate repairs if issues arise. Safety comes first; don't wait for the problem to escalate before taking action.