Explosion-proof solar street light is a kind of lighting equipment that uses solar energy to generate electricity and store electric energy. It can provide lighting at night and has explosion-proof function. It is suitable for some special environments, such as. petrochemical plants, mines, etc.
The batteries used in explosion-proof solar street lights are generally lithium batteries. The lithium battery is a battery with high energy density, light weight, no memory effect and low self-discharge rate. It has a long service life and high safety performance, so it is very suitable for explosion-proof solar street lights.
There are many types of lithium batteries, the most common are lithium-ion (Li-ion) batteries and lithium-polymer (Li-polymer) batteries. Both batteries have high energy density and long life, but in certain casesIn specific application scenarios, lithium polymer batteries are more popular. Compared with lithium-ion batteries, lithium-polymer batteries are thinner and lighter, and can better adapt to the design requirements of explosion-proof solar street lights.
The lithium batteries of explosion-proof solar street lights generally have a large capacity to ensure continuous power supply at night. This ensures that the street lights can continue to light up at night and can store enough energy when charging to cope with rainy weather for several consecutive days.
In order to ensure the normal operation of explosion-proof solar street lights, lithium batteries must have special properties. Firstly, they must have high charging and discharging efficiency to ensure that the solar charging panels can effectively convert solar energy.lary in electrical energy and provide a stable power supply at night. Second, lithium batteries must have a low self-discharge rate to ensure that they can be stored for a long time even if not used for a long time. In addition, lithium batteries must also have high safety performance to avoid safety problems such as overcharging, overdischarging and short circuit.
In short, the batteries used in explosion-proof solar street lights are generally lithium batteries, of which lithium polymer batteries are the main ones. This type of battery has high energy density, long life and high safety performance, can meet the needs of explosion-proof solar street lights, and can work stably in special environments.
Are lithium batterieslikely to explode?
Lithium batteries are not safe.
Lithium batteries also have a risk of exploding, but the risk is not that high. It can also be said that all batteries are dangerous and carry risks, and according to the data, although lithium batteries. explode The risk is very low, but the risk of spontaneous combustion of lithium batteries is relatively high. In fact, excellent and regular high-quality lithium battery brands have done enough work in all aspects of lithium battery production, from battery cells, external structures, the entire battery and the he entire vehicle system, they have a rigorous and rigorous set of tests. safety standards. design system, manufacturers have minimized risks before the products leave the factory, eliminating any risk toSecurity.
Are lithium batteries more likely to explode?
Are lithium batteries more likely to explode? Currently, most lithium batteries have been developed for more than several decades. they are in the market.All cell phones also have built-in lithium batteries. We often see news about cell phone explosions, so is there a good chance that lithium batteries will explode? Let's find the answer together.
Are lithium batteries more likely to explode? 1As long as it is a lithium battery, there is a risk of explosion, but the probability of this risk is very small. But once it explodes, the explosion power of a larger capacity lithium battery is unimaginable.
There are two important causes of lithium battery explosion, one isone short circuit and the other an overload. A short circuit is easy to understand, that is, the positive and negative terminals of the battery are in direct contact. First, the heat generated by a short circuit in a small area over a normal short period of time is actually very small and will not cause thermal runaway. The battery core itself is designed with an explosion-proof valve, which means that when the internal pressure of the battery core exceeds a certain value, the explosion-proof valve will open and the heat will dissipate quickly. The second is that normally used battery charging equipment is protected against overload and stops charging when the battery voltage reaches a certain value. The third battery cell case itself is a very protective steel shell.
How powerful is the explosion of li batteriesthium?
Calculate, a fully charged 2.6 Ah ternary 18650 lithium battery has a charge of 2.6* 3.65* 3.6 = 34.164 kilojoules of energy . The energy generated when the muzzle of a general gun is fired is approximately 2.2 kilojoules, which is equivalent to the work done when a force of 1 Newton moves an object 1 meter in the direction of the force. meters from the gun, can easily kill enemies. Think about it, a Tesla requires more than 7,000 3.4 Ah 18650 model lithium batteries.
A 50AH battery with an aluminum alloy case and a size of 20*120*300 ( mm) and lithium manganate as a positive cell exploded during a load test: the 3 meter high roof was blackened. , a hole was dug in the wall about half a meter from the battery (I forget if the wall was brick or sandwich panel), and the door and window panes were shattered. Fortunately, there was no oneat the time of the explosion.
Therefore, lithium batteries pose a risk of fire, explosion and combustion. Do not refill, disassemble, squeeze, heat above 212°F or incinerate.
Causes of explosions and fires of lithium batteries
1. Insufficient capacity of the negative electrode of lithium batteries
When lithium When the capacity of the negative electrode of the positive electrode of the battery is insufficient, the lithium atoms generated during charging cannot be inserted into the graphite interlayer structure of the negative electrode and will precipitate on the surface of the negative. electrode to form crystals. Long-term crystal formation in lithium batteries will cause short circuits. At this time, the battery cells will discharge quickly, generating a large amount of heat and burning the battery cells.eurs. High temperature will cause the electrolyte to decompose into gas. When the pressure is too high, the battery core will explode.
2. The water content is too high
When charging, water may react with lithium.The generation of lithium oxide will cause the battery core to lose capacity, and it is easy to overcharge the battery core and generate gas. The decomposition voltage of water is low and it is easy to decompose to generate gas during charging. When this series of gases generated will explode the inside of the battery core. When the pressure increases and the outer casing of the battery core cannot withstand it, the battery core will explode.
3. Internal short circuit
The internal short circuit of the cell causes a significant current discharge, generates a large amount of heat and burns thediaphragm. If a larger short circuit occurs, the electrolyte will decompose into gas and if the internal pressure is too high, the battery core will explode.
4. Overcharging of lithium batteries
When the battery is overcharged, excessive release of lithium from the positive electrode will cause the structure of the positive electrode. change, and the excess released lithium may easily not be inserted into the negative electrode and may easily cause lithium to precipitate on the surface of the negative electrode. Additionally, when the voltage reaches more than 4.5V, the electrolyte will decompose. produce a large amount of gas. All of the above can cause an explosion.
5. External short circuit
External short circuit can be caused by poor connection of positive and negative poles due to short circuit external. , the battery discharge current is very imbearing, which will cause the battery to malfunction. The heat and high temperature of the core will cause the diaphragm inside the battery core to shrink or be completely damaged, causing an internal short circuit and thus an explosion.
Is there a high risk of a lithium battery exploding? 2What is the risk of a ternary lithium battery exploding
The risk is quite high. When. the battery cell is overcharged, the positive electrode contains too much lithium. The release will change the structure of the positive electrode, and too much released lithium can easily not be inserted into the negative electrode, and it will also easily cause lithium precipitation. on the surface of the negative electrode. In addition, when the voltage exceeds 4.5 V, the electrolyte decomposes to produce a large amount of gas. All of the above can cause an explosion. The forward signt-runner from an explosion is a deformation due to the heat generated during charging. The harmful consequences can be a short circuit, an open circuit or even an explosion.
Ternary lithium battery or 18650 lithium battery Which is more powerful in the event of an explosion
< p> Lithium battery After all, it's just a battery, not a bomb. Even 18650 lithium battery has the worst safety and slow discharge performance. At most, it burns violently after bursting. a little noise when bursting. The final conclusion was that even if 2,000 to 3,000 lithium batteries were stacked together, the force of the explosion would still be limited and would hardly kill them. Therefore, in daily life, you should be careful when using equipment equipped with 18650 lithium batteries.The preparation process of lithium batteries is very abouti. In addition to greatly improved performance, its security is also very comprehensive. In order to prevent the sealed metal case from exploding, a safety valve is installed on the top of the 18650 battery. This is the standard configuration of every 18650 battery and is also the most important explosion-proof feature. . When the internal pressure of the battery is too high, the safety valve on the top of the battery opens the exhaust and pressure reduction function to prevent explosion.
However, many issues remain regarding the safety of ternary lithium batteries. During a car accident, external impact may damage the battery diaphragm, causing a short circuit. The heat released during the short circuit will heat the battery and increase its temperature to over 300°C. Ternary lithium batteries have poor th stabilityermic. Oxygen molecules decompose when the temperature is below 300°C. When exposed to the flammable electrolyte and carbonaceous materials of the battery, the heat generated further intensifies the decomposition of the positive electrode. shortly it will burn inside.
In comparison, another widely used lithium iron phosphate battery can be maintained at 700-800°C without decomposing oxygen molecules and is safer.