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On April 16anexplosion occurred when Beijingfirefighters were responding toa fire in a 25 MWh lithium-iron phosphate battery connected toa rooftop solar panel installation. Two firefighters were killed and one injured. CTIF can now publish a translation of the Chinese report from the incident.
Beijing Fire Station has beeninvestigating the cause of a firein an LFPbattery which killed the two firefighters while working to put out a fire on the roof of a shopping mall in the Chinese capital on Friday April 16th.
The city fire station said it received reports of a fire at the Jimei Home Dahongmen store at 12:17 p.m. and allegedly dispatched 235 firefighters with 47 fire trucks from 15 fire stations.
An explosion occurred in the north section which killedtwo firefighters and injured a third. Also astaff member of the Beijing Gotion Full-Service has been missing since the incident.
The report is unsure of the exact reason for the sudden explosion, but is leaning towards the possibility of environmental wear and tear destroying the insulation of the battery by dust and sand having accumulated:
"The sudden explosion of the power station in the north area could be explained by the safety accident induction mechanism of lithium batteries, which is the thermal failure of the batteries in the extreme conditions when they were significantly affected by internal and external sources. The safety of battery-based energy storage system is complicated because it involves batteries, battery management systems, cables, system electrical topology, early warning, monitoring and firefighting systems et al. Due to the limitation of accidental information, it is hard to determine the fire accident was initiated by the poor quality of the batteries or the overloading input to the batteries which exceeds the limitation of the batteries. Several possible reasons are proposed as follows".
The report then lists several probable causes if this fatal failure, and recommendations for how to build and respond safer when it comes to these types of batteries.
Here is the downloadable report from the incident, translated within the network of the HyResponder project, ofwhich CTIF are active members.
Download the PDF report with illustrations below:
Accident analysis of Beijing Jimei Dahongmen 25 MWh DC solar-storage-charging integrated station project
Institute of energy storage and novel electric technology, China Electric Power Technology Co., Ltd.
1. General information of the project
Jimei Dahongmen 25 MWh DC photovoltaic-storage-charging integrated station project was reported to the Development and Reform Commission (DRC) of Fengtai district of Beijing city in April 2018. This project was developed and operated by Beijing Fuweisi Oil & Gas Co., Ltd. The 1st phase of the project includes a 1.4 MWh roof-based solar photovoltaic energy system, 94 parking lots equipped with 150 KW single highly powerful DC fast charging piles. Among the 25 MWh capacity, 12.5 MWh is used to charge external EV cars (including 4.0 MWh for private vehicles in the south area + 8.5 MWh for public buses in the north area) and 12.5 MWh for indoor electricity supply.
This project was commercialized in March 2019, which was the biggest commercial energy storage station for customers in central Beijing city, the largest scale public charging station, the first MWh-level solar photovoltaic energy storage-charging station, the first user side new energy DC incremental distribution network, the largest demonstration project of solar photovoltaic energy storage-charging. The project layout is shown in Fig. 1.
Fig. 1 The layout of the 25 MWh solar-storage-charging project
Monocrystalline silicon photovoltaic panels were installed on the rooftop idle space of Jimei Furnishing plaza to construct the photovoltaic electricity generation system, as shown in Fig. 3. Charging piles were installed for electric vehicles, see Fig. 4. The solar storage-charging system was made by integrating the sub-systems of photovoltaic electricity generation, AI charging piles and energy storage. For the energy storage system, handheld
firefighting equipment was equipped near the battery clusters for the emergency treatment of early accidents.
Fig. 3 Photovoltaic electricity generation system
Fig. 5-7 are not translated. Please read the original report.
https://wemp.app/posts/547dac6a-171c-4389-b735-8951c0e8bcd8
Fig. 8 Aerial photography of the accident scene
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