According to the Korean media e2 news report, since this year, only two rock explosion accidents have occurred in Lingyan and Qingshan. It has been confirmed that a company supplies products uniformly... The cause of the specific accident is currently unknown.
A fire broke out in the ESS equipment connected to the Lingyan Wind Power Plant, causing the 706m2 scale battery building and more than 3,500 lithium batteries to be burned.
It is understood that the lithium battery used in the power storage device (ESS) has become a 'time bomb' that can explode at any time. A company's battery has experienced several explosions including major fires, but so far the correct cause has not been investigated. According to the rumors of the relevant personnel at the scene, there are also a few defects in self-defects that have not been exposed. The ESS energy storage system located in the country under the name of cultivating new energy industry exceeds 1000MW. Some people believe that these ESS batteries need to be comprehensive. Safety management inspections and preemptive accident prevention measures.
According to the power industry and the fire authorities, the results of the on-site confirmation by the authorities show that the major fire source of the ESS energy storage equipment in the Firestone Mountain Lingyan Wind Power Park in Jinjing, Jinyan, Jingnan County, at 4 pm on July 2 is the battery room. According to the survey results, the electrical room exploded due to an unexplained cause of a battery, which caused more than 3,500 batteries to be stacked together, causing a chain explosion and a major fire.
It is understood that the scale of the energy storage equipment is 12MWh battery capacity, 4MW PCS (energy storage converter), tendered by the name GEC, a company to undertake the project by general contracting, installed in 2015. The battery uses the company's lithium battery. Coincidentally, on the day of the fire, the energy storage equipment was inspected by the outsourcing cooperative company. It was confirmed that five days before the accident occurred, that is, on June 28, Lingyan Wind Power found the battery to display the deviation signal and applied for the company to check, the day of the fire. The partner company responsible for maintenance is present to inspect the battery and replace the module parts.
Lingyan ESS energy storage equipment fire scene
It is understood that the related cooperative company said that after replacing the battery control system (BMS), it is ready to reconnect the battery and PCS, and the explosion sounds at the same time, and at the same time it starts to catch fire, burned the module and all the equipment. For a while, the fire flame is as high as At a height of tens of meters, the 708m2 temporary building and more than 3,500 batteries were burned. According to the fire department, the economic loss reached 4.6 billion won. More than 20 fire engines and more than 100 firefighters were put into the fire. After more than three hours, it was successfully extinguished.
Relevant personnel of the fire department said: 'The surveillance site confirmed that the location of the fire is indeed the battery room. The current situation (cause) is temporarily an electrical explosion, but it is still not confirmed whether there is any other cause of the accident. ' 'A company put All the log files were copied away. Although the National Science Research Institute confirmed the scene, it still could not enter the scene.
In addition, the relevant personnel said: 'Although there are fire-fighting facilities on site, these devices did not start normally when the fire occurred. ' At the same time, because the relevant equipment was added to the fire insurance, if the cause of the accident was found to be caused by a battery defect, The manufacturer can obtain compensation through the production of product insurance; if it is caused by other reasons, it can be compensated by fire insurance.
It is worth noting that this is not the first ESS energy storage device battery fire. According to the Korea Electric Power Corporation, it happened to be the Lingyan Wind ESS fire a month ago on the 2nd of last month, and it was also inferred that the battery was overheated at the Qingshan Substation. The explosion caused a fire, burning more than 100 frequency adjustment (FR) batteries and 16m2 container inside. The Qingshan substation with a capacity of 345kV installed 12 sibling (4MWh) ESS energy storage containers, if not timely Fighting the initial fire, the result will be a major fire and ultra-high voltage transmission line burnout accident.
It is reported that the battery used in the ESS energy storage equipment of the substation and the battery used by the Lingyan ESS energy storage equipment are all produced by the same enterprise.
Relevant personnel of the Korea Electric Power Corporation said: 'The cause of the specific accident is still being analyzed. Finally, there is a responsible party between the (general contracting) supplier and the (battery) manufacturer. At present, there is no plan to expand the FR ESS at 376MW. This year only research Solar related rental business. '
Another person from the power company said: 'Two years ago, the Gyeongsangbuk-do Substation also had a fire in the same type of battery test run. In other companies, the company’s batteries were burned, but the outside world did not know. .
It is understood that not only the ESS energy storage system has been dangerous. In 2016, in the United States, the Tesla electric car model S hit the trees and a battery explosion occurred, the driver died on the spot; the same month, in the United States, driving the same model Two high school students of electric vehicles died in a fire that occurred after hitting the central barrier. During the past three months, another model of Tesla had a fire after the impact. Especially the authorities were surprised. The accident vehicle was towed back to the fire department and continued to burn after the fire was extinguished.
Some experts pointed out that the risk of battery fire has been neglected by people, especially the lack of safety management of ESS energy storage equipment using a large number of batteries.
Experts in the new energy industry believe that 'lithium-ion batteries are not easy to ignite, but once they become a fire, their flame strength cannot be extinguished with water, and there will be a series of explosions like fireworks. Although the popularity of ESS energy storage systems is commendable. However, it is necessary for the government or safety regulators to pay attention to this, at least to have a minimum safety concept, and to conduct an all-round inspection of installed energy storage system equipment.
Professor Chen Yongwei, head of the energy storage technology group of the Institute of Electrical Engineering of the Chinese Academy of Sciences, believes that the existing structural design of lithium-ion batteries is used for large-scale energy storage, and there is still a large safety risk, requiring innovative breakthroughs. Especially ternary lithium batteries, even batteries. The external voltage of the system is within the normal range. After a period of use, it is difficult to ensure the uniformity of the electrochemical properties of the internal materials of the battery. The local active area is prone to overcharge or overdischarge, causing lithium dendrite short circuit or electrolyte. Decomposition, which in turn causes the battery to run out of control, causing combustion or even explosion.
Chen Yongzhen pointed out that the current energy storage lithium battery system lacks an internal controllable safety design. Once a battery is out of control, it is easy to cause the overall loss of control of the battery system. Therefore, the lithium battery is used for power storage and needs a larger Technical breakthroughs to address safety and longevity issues. In addition, application safety standards for energy storage batteries need to be established to avoid safety incidents.
Liu Yong, secretary-general of the China Energy and Physical Power Industry Association Energy Storage Application Branch, said that as of now, the industry's main focus is on business model innovation in energy storage applications, with energy storage projects in new energy generation, grid side, industrial and commercial users. Side, power-assisted services, micro-grid, optical storage charging station, energy Internet, smart energy, data center, energy-saving renovation, shore power transformation and many other fields, and the scale of energy storage power stations gradually to megawatts, dozens of megabytes It is particularly important to improve the energy storage system and prevent safety measures by pushing the watt level or even the megawatt level.
Liu Yong pointed out that it is hoped that the security risks exposed at present should be paid attention to by relevant authorities. The project industry is mainly actively doing relevant risk safety assessment and pre-planning measures. At the same time, it should be summarized from the current security risks exposed in global energy storage projects. Experience, optimize the overall structural design of the energy storage system, and focus on building a product safety standard system to jointly promote the healthy and stable development of the energy storage industry.
In response to the safety risks of current energy storage projects around the world, China Energy Storage Network will continue to pay more attention.
