With the rapid development of science and technology, lithium batteries have been widely used in our daily lives, from mobile phones and laptops to electric vehicles. However, this kind of battery, which is known as the "energy of the 21st century", also brings a hidden worry. Lithium batteries are both combustibles and ignition sources, once collision, excrushion, overcharge and short circuit occur, etc., it may cause safety accidents.
First, the reason for lithium battery.
Lithium batteries work by relying on lithium ions to move between the positive and negative electrodes to achieve the charging and discharging process. In this process, the battery accumulates a lot of heat. If the heat is not dissipated in time, it can lead to thermal runaway of the battery, which in turn can cause a fire or**. Specifically, the main factors that cause lithium batteries** are overcharge and short circuit.
Overcharged. Overcharging mainly occurs during the charging process of lithium batteries. Due to the internal resistance of the battery, the battery will accumulate a large amount of heat during charging. In order to protect the battery, the lithium battery is usually equipped with a protection device to protect the overcharge to a certain extent by detecting the voltage. However, when the overcharge time is too long and the voltage continues to be too high, the dendrite short circuit inside the lithium-ion battery is prone to occur, resulting in the continuous rise of the temperature and pressure of the lithium battery, resulting in the risk of high quality.
Short circuit. Short circuits mainly occur during the use of lithium batteries. When the lithium battery is in use, its own temperature will continue to rise, and the battery will also maintain normal heat dissipation. If the battery temperature is too high due to external factors, such as prolonged exposure to high temperature or the use of a charger that does not meet the specifications, it is easy to cause damage to the battery separator and cause a short circuit. A short circuit can cause excessive internal heat accumulation, triggering a chain chemical reaction and eventually causing the battery to burn.
Second, the characteristics of lithium-ion batteries.
Lithium-ion batteries** have several distinguishing features: fast ignition speed, long duration, high combustion temperature, and difficulty in extinguishing. Once lithium-ion batteries**, fires tend to spread quickly and burn for a long time, making it extremely difficult to extinguish fires. In addition, lithium-ion batteries burn at extremely high temperatures that can reach more than 600 °C, which makes conventional fire extinguishing methods often ineffective. To make matters worse, even if the flame is extinguished, the short-circuit reaction inside the battery may still continue, and there is a risk of spontaneous combustion or even ** for a long time.
3. How to deal with the risk of lithium batteries.
In the face of the risk of lithium battery ***, we should take a series of measures to reduce this risk:
Use regular brands of lithium batteries and chargers: Buying and using regular brands of lithium batteries and chargers can reduce the safety risks caused by product quality issues.
Avoid overcharging: Reasonably control the charging time and avoid overcharging for a long time to reduce the risk of short circuit of dendrite.
Control battery temperature: Avoid exposing lithium batteries to high temperatures and ensure that the battery operates within the normal operating temperature range.
Prevent physical damage: Prevent the battery from physical damage such as collision and crushing to prevent the occurrence of internal short circuits.
Understand safety knowledge: learn and understand the knowledge about the safe use of lithium batteries to improve self-protection awareness.
In short, although lithium batteries bring many conveniences, we also need to pay attention to their safety risks at all times. By understanding the causes and characteristics of lithium batteries*** and taking corresponding precautions, we can better ensure the safety of ourselves and others.