Recently, a deflagration occurred at the Tesla Megapack energy storage power station in Victoria, Australia, causing a fire.

On the fourth day after the fire broke out, the local government was still trying to control the fire. The Victorian Fire Services Authority stated in a recent statement that although the blaze has clearly subsided, it has not been brought under control.

It is understood that the energy storage project is one of the largest battery energy storage projects in the world. The facility where the accident occurred was a lithium battery weighing 13 tons. It was a "Victoria battery" jointly created by French renewable energy company Neoen and Tesla. The components of the project.

In the past few years, with the support of various sources of capital, the energy storage market has gradually heated up, but the safety issues related to it have gradually been exposed. According to incomplete statistics, there have been 26 explosions and fire accidents in energy storage projects worldwide in the past 3 years. In April of this year, an explosion occurred at a lithium battery energy storage power station on the South Fourth Ring Road in Beijing.

Today, the explosion of Tesla's energy storage project has once again lit the "red light" for the safety of lithium battery energy storage, and has also sounded the alarm for the entire industry.

Lithium is the most active metal in the world. Due to its active chemical properties, when lithium metal is exposed to the air, it will produce a violent oxidation reaction with oxygen, so it is prone to explosions and combustion. In addition, redox reactions are also generated inside the lithium battery during the charging and discharging process. The explosion and spontaneous combustion are mainly caused by the accumulation of the lithium battery after heating, and it is too late to diffuse and release. Simply put, a lithium battery will generate a lot of heat during the charge and discharge process, which will cause the internal temperature of the battery to rise and the temperature unevenness between the single cells, which will cause the new energy of the battery to be unstable.

l  The fire hazard of lithium battery production

1. Positive and negative ingredients

Since most of the materials used are ultra-fine powders, especially anode powders (containing carbon powder), dust agglomeration may form during the stirring process and there is a danger of explosion.

2. Electrode coating

During the coating process, since the slurry uses an organic solvent and needs to be dried by a high-temperature heating device, it is easy to cause solvent fire or explosion accidents.

3. Pole piece equipment

The electrode and the shell need to be welded during the assembly process. Because the lithium battery shell and cover are made of aluminum, a large amount of aluminum dust will be generated during the welding process, which may form agglomeration of dust, and there is a danger of explosion.

4. Inject electrolyte

Lithium-ion batteries need to be charged with organic solvents and inorganic salt electrolytes. Organic solvents are flammable liquids, and currently used are basically divided into two categories: ethers and lipids. Ethers mainly include cyclic ethers and chain ethers; lipids mainly include propylene carbonate and ethylene carbonate. These substances are all flammable liquids, which are very easy to burn when exposed to heat, open flames, and strong oxidants.

5. Formation and post-processing

The battery may explode due to manufacturing defects or battery overheating (above 150) during battery charging.

l  To prevent electric vehicle fires, Weiqi Power recommends starting from the following aspects

1. Pay attention to the licensing policy of electric vehicles. If you modify the appearance of the vehicle and the battery without authorization, you will not be able to license it.

2. Looking at the types of electric vehicle batteries, electric vehicle batteries are mainly divided into two categories, one is lead-acid batteries, and the other is lithium batteries. Compared with lead-acid batteries, lithium batteries have obvious advantages. The battery of the car is charged and discharged normally, and the safety inspection of the electric car should be carried out at the store on a regular basis.

3. We need to monitor the status of the battery at all times. During the battery charging process, the external temperature rises quickly. During the use process, the battery life suddenly drops below 60%. If it does not go in or fills up in a short time, we need to check whether it is a problem with the charger or the battery. When the battery reaches the end of its life, it must be replaced.

4. We also need time to monitor the health of the battery. All brand specialty stores on the market can conduct free inspections. When you think that the service life of electric vehicles is relatively long, or there are some problems in the use process, you can go to the store for inspection.

5. Choose lithium batteries produced by regular shopping malls, such as CATL, BYD, VEHICLE, BAK, Lishen, Wanxiang A123, AVIC lithium battery, etc., with complete core technology of the entire industry chain, VEHICLE intelligent lithium battery protection The board also has an equalization function, which can intelligently set all parameters to a safe range. When abnormal data occurs, the BMS board displays the alarm status, and the alarm prompt parameters are checked to ensure that the battery is in a safe state.

As for the commercial aspect of batteries, due to the constraints of volume, weight, energy storage and release capacity, storage time, service life, cost, ease of use, and mass production, there are only a few batteries that can be used in large-scale commercial applications. Combining these two reasons, lithium batteries have become the best solution.

l  The intelligent lithium battery BMS protection board intelligently protects the lithium battery

The lithium battery protection board plays an important role in protecting the lithium battery. The lithium battery protection board is what we often call the BMS protection board. The Chinese name is battery management system.

When charging and discharging, current limitation is also necessary. When the current is too large, lithium ions will not have time to enter the interlayer structure and will also collect on the surface of the negative electrode material. After these lithium ions obtain electrons, they will produce lithium atom crystals on the surface of the material, which is the same as overcharging, which is dangerous.

The BMS board can monitor the voltage, current and temperature of the lithium battery and intervene when needed according to the status of the lithium battery. Therefore, the smart lithium battery BMS board has overcharge protection, discharge protection, over current protection, and short circuit protection. The protection board of Weiqi Power also has an equalization function, which can intelligently set all parameters to a safe range. When abnormal data occurs, the BMS board displays the alarm status, and the alarm prompt parameters are checked to ensure that the battery is in a safe state.

Intelligent lithium battery BMS protection board manufacturers generally have professional production technology patents, focus on battery manufacturing technology, use the Internet of Things SAAS platform, safe and stable, no explosion hazard, strong endurance, long-lasting power, high charging conversion rate, and no hot , Long service life and durable, it is the intelligent embodiment of lithium battery. Many lithium battery manufacturers are committed to providing global users with more competitive customized lithium battery solutions and products, and walk hand in hand with global users and partners to seek common development, jointly maintain a green home, and build a harmonious society.