Lithium battery

A: Thermal runaway is often caused by overcharging, short circuit, physical damage or high temperature environment. When overcharged, the positive electrode material decomposes and releases oxygen, which reacts violently with the electrolyte to cause explosion; the large current at the moment of short circuit causes local overheating. Preventive measures include using qualified BMS system monitoring, avoiding extreme temperature environments, and standardizing the charging and discharging process.

A: Lithium battery fires require special fire extinguishing agents, and the water-based fire extinguishing efficiency is only 30% of traditional fires. The risk of re-ignition continues until the battery is exhausted, and the combustion releases highly toxic gases (such as HF), which can be fatal if the concentration reaches 50ppm in 1m³ space. In case of fire, the battery should be covered with a fire blanket, the source of fire should be isolated, and professional personnel should be contacted for handling.

A: New batteries can be used directly, but when used for the first time, the remaining power can be exhausted and then fully charged, and repeated 2-3 times to activate activity. Daily charging until the indicator light turns green can be avoided.

A: Lithium battery has no memory effect and can be charged at any time, but avoid over-discharge (charge should be timely when the power is less than 20%). When not in use for a long time, it should be fully charged and stored in a dry and cool place, and the power should be kept at 40%-60%.

A: Charging should be carried out in a dry, ventilated and cool place, away from flammable and explosive items. The temperature should be controlled at 0℃-45℃, avoiding high temperature, humidity or direct sunlight.

A: The life span varies depending on the type and usage habits. Ternary lithium battery has about 1000 cycles (3-4 years), and lithium iron phosphate battery can reach more than 2000 times (7-8 years). Shallow charging and discharging and avoiding extreme temperatures can extend the life span.

A: Charge and discharge depth (it is recommended to maintain 20%-80%), charge and discharge frequency, temperature conditions (high temperature accelerates aging), battery quality, etc. Frequent deep charging and discharging or extreme temperatures can significantly shorten the lifespan.

A: They include cross-current charging (such as fast charging, slow charging), constant voltage charging, cross-current constant voltage charging, pulse charging, etc. Pulse charging is widely used because of its large current and small impact on battery life.

A: The initial charging should not be too long, and long-term continuous charging should be avoided; Charge and discharge regularly (once a month when not in use for a long time); Use a matching charger; Avoid physical damage (such as falling, water ingress).

A: Rely on lithium ions to move between positive and negative electrodes to store and release electrical energy. When charging, lithium ions are embedded from the positive electrode (such as lithium metal oxide) into the negative electrode (such as graphite); When discharging, lithium ions return to the positive electrode to release electrical energy.

A: It is mainly composed of a positive electrode, a negative electrode, an electrolyte, and a diaphragm. The positive electrode material is lithium compound, the negative electrode is mostly graphite, the electrolyte is an organic solvent, and the diaphragm prevents direct contact between the positive and negative electrodes.

A: It may be that the cell capacity is inconsistent. You need to use a balanced charger to make the voltage of each string consistent, or replace the bad cell.

A: It may be because the voltage is too low to trigger the protection board protection, the line is disconnected, or the switch is not turned on. Solution: Charge to restore the voltage and check the line connection.

A: The battery is not fully charged, the cell capacity varies greatly, there is a micro short circuit or a high self-discharge rate. You can recharge, replace the cell or check the circuit.

A: Long cycle life (more than 2000 times), good high temperature resistance, but the energy density is lower than that of ternary lithium batteries. When fully charged, the voltage of a 12V battery is about 13.3V, and that of a 24V battery is about 26V.

A: The discharge temperature range is -20℃~60℃, but the internal resistance increases and the capacity decreases at low temperatures. It is recommended to avoid long-term use in low temperature environments.

A: Choose regular channels and products with quality assurance to avoid counterfeit and inferior batteries. Pay attention to whether the battery type (ternary lithium, lithium iron phosphate), capacity and charging and discharging parameters match the equipment requirements.

A: Keep the power at 40%-60%, store in a dry and cool place (temperature 4℃-35℃), and avoid metal objects contacting the positive and negative poles to cause short circuits.

A: Remove the battery immediately, open the cover to dry, avoid direct charging or use, and check the performance after thorough drying.

A: Do not knock, puncture, or step on; Avoid modification or sun exposure; Do not mix with metal objects; It is strictly forbidden to use non-original chargers; It is forbidden to use in microwave, high voltage and other environments.