THE EDGE
The root causes of these problems are internal short circuits inside the batteries and internal thermal runaway caused by external factors such as overcharge , squeeze , puncture and drop .
3 . Compatibility
Data centre operators that are considering replacing their existing battery string with Li-ion are concerned as to whether their existing UPS system is compatible with Li-ion technology .
They are concerned whether the installed UPS system will operate property with Li-ion batteries as the charging circuit and controls for Li-ion differ from lead-acid batteries . They feel that significant hardware and embedded software upgrades may be required .
To improve the reliability of Li-ion battery , Frost & Sullivan proposes the following recommendations :
Select stable cell materials . Among all the cell materials , LFP has highly stable molecular structure and no fire when thermal runaway . LFP decomposition does not generate O2 , which dramatically reduces the explosion risk .
For example , nail test is used to verify the reliability of LFP .
Ensure system level reliability . The BMS management system of lithium batteries is particularly important .
Multi-level BMS management must be used to identify faults and maintain in advance to control thermal runaway in the early stage to prevent fires . For example :
• The reliability of the cell is predicted by the internal shortcircuit algorithm
• The BMS system has the current sharing control function
Combine with prevention and firefighting . The reliability of lithium battery depends on prevention .
Once a fire occurs , the impact must be minimised to prevent the fire from spreading in the cabinet . In addition , the cabinet must be equipped with fire extinguishing methods .
When a fire occurs , the cabinet can be started to quickly extinguish the fire . Incabinet fire extinguishing modes can be module-level or cabinet-level .
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Product recommendation : Huawei SmartLi UPS
Due to Huawei ’ s technical strength and rich experience in the power supply industry , Huawei continues to invest in R & D and innovation .
Huawei also continues to pursue higher power density and more advanced Li-ion battery energy storage technologies in data centres , to meet the new requirements of simplified architecture , high reliability and simplified O & M for power supply system of cloud data centres , and helps customers accelerate Digital Transformation . ◊
GENERALLY , THE RELIABILITY PROBLEMS OF LITHIUM-ION BATTERIES ARE COMBUSTION OR EVEN EXPLOSION .
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