1.Deadly “battery cancer”: How do lithium plating threaten safety?
When your new energy vehicle suddenly loses power during fast charging, or its range drops by 20% inexplicably, the culprit behind this may be “lithium plating” – metal crystals with a diameter of only a few microns are quietly growing inside the battery.
Like cancer cells, it penetrates the diaphragm (only 0.016mm thick), causing short circuits, fires, and even explosions. CATL laboratory data shows that 68% of battery thermal runaway accidents are caused by lithium plating, whose growth rate increases by 3 times during fast charging and may pierce the diaphragm within 3 months. Key data: In the spontaneous combustion accident of Tesla Model S caused by lithium plating short circuit, the battery temperature soared to 1400℃ in 15 seconds, far exceeding the melting point of steel (1370℃).
2.What are the three main reasons for the formation of lithium plating?
| Causes | Level | Daily scenarios | Solution |
| Fast charging dependence | ★★★★★ | Use fast charging to 100% every day | Set the charging limit to 85%, calibrate the slow charge once a month |
| High temperature environment | ★★★★ | Charge outdoors in summer (battery temperature > 55°C) | Choose a charging station with liquid cooling |
| Battery aging | ★★★ | Cycle life exceeds 2000 times (internal resistance increased by 15%) | Perform BMS health check every 20,000 kilometers |
3.Technical Breakthrough
Material Improvement:
- Silicon-based anode: Tesla’s 4680 battery uses a silicon-carbon composite anode, which reduces the growth rate of lithium plating by 40% and increases the cycle life to 2,500 times.
- Solid-state electrolyte: Toyota’s solid-state battery uses a ceramic diaphragm to completely suppress dendrite formation, and the energy density exceeds 400Wh/kg (laboratory data).
Intelligent monitoring system
- BMS high-frequency internal resistance tracking: BYD Haibao BMS detects 1kHz-10kHz internal resistance every 500ms, and triggers a yellow warning when the internal resistance increase is greater than 2%.
- AI prediction model: The neural network developed by Volkswagen and IBM can predict dendrite risks 3 months in advance by analyzing the charging curve, with an accuracy rate of 92%.
3.Charging strategy optimization
- Three-stage charging: NIO ET7 adopts the “constant current – pulse – constant voltage” mode, dynamically adjusting the current during the fast charging stage to reduce the amount of dendrite generation by 62%.
- Temperature compensation algorithm: When the battery temperature is greater than 50℃, the charging current is automatically reduced to 0.3C to avoid high temperature accelerating dendrite growth.
4.Car Owners Must Know: Daily Protection
Charge Protection
- Avoid charging at night (high incidence of fire 22:00-6:00), and keep the fast charging ratio within 80%.
- Choose charging piles equipped with liquid cooling and keep the distance between vehicles ≥ 1.5 meters when charging.
Anomaly Recognition
- If the fast charging time is suddenly extended by 15% (e.g. from 30 to 35 minutes) or the voltage drops >0.2V at the end of charging, stop charging immediately and contact a 4S store.
- Use the “Range Correction Factor” to self-check: Be alert if the actual range / apparent range is less than 0.85.
Periodic Maintenance
- Check the bottom of the battery every 10,000 kilometers (bottoming damage accelerates the formation of dendrites) and perform BMS health calibration every 20,000 kilometers.
- Pre-charge the battery at 0.1C for 10 minutes (to activate the internal temperature of the battery) before charging at low temperature in winter.
How can solid-state batteries end lithium plating?
It is expected that by 2030, solid-state batteries will occupy 30% of the market share. Its core breakthrough lies in:
1- Sulfide electrolyte: ion mobility is 5 times higher than liquid state, and the probability of dendrite growth is reduced by 90%.
2- Lithium metal anode: QuantumScape experiments show that the capacity retention rate of solid-state batteries is still >95% after 1000 cycles.
3- Self-healing technology: MIT developed “self-healing solid-state electrolyte”, which can automatically fuse off the dendrites in case of micro-short circuit to avoid thermal runaway.
Conclusion: Rational Response, Safe and Controllable
Conclusion: Rational Response, Safe and Controllable
The risk of lithium plating is not insurmountable. By choosing models with pulse charging technology (e.g. BYD Han EV), avoiding excessive fast charging, and conducting regular professional inspections, vehicle owners can reduce the risk by more than 70%. As solid-state battery technology matures, it is expected that the rate of thermal runaway accidents caused by lithium plating will drop to less than 0.0001% by 2035. The safe future of new energy vehicles is being improved by every change in charging habits and every technological breakthroughs.