How does SES Power view the safety, cost and system solutions of lithium battery energy storage systems?

　　As a manufacturer with deep experience in the customized lithium battery energy storage industry, SES Power has always been full of information on the development of the energy storage industry, and we insisted on focusing on lithium iron phosphate battery energy storage systems ten years ago. and production direction.

　　The concept of safety first has always been adhered to by SES Power, so we have conducted extensive and in-depth research on the possible safety risks of electrochemical energy storage products and scenarios, and analyzed known and unknown problems from them, and finally targeted Come up with security solutions.

　　Let the senior engineers of SES Power analyze in detail the performance and development of the current energy storage products in the field of safety from several aspects.

　　Q: At present, temperature control integrators and energy storage system integrators have launched liquid cooling products respectively. Are the technical routes of the two different and can they meet the safety needs of the energy storage industry?

　　A: Compared with the air-cooled system, the liquid-cooled system has obvious advantages in heat conduction, energy density, safety, reliability, etc., especially in solving the problem of uneven battery temperature in the air-cooled system. Substantial improvement, making the battery Modules have greatly improved cycle life and reliability.

　　As far as liquid cooling products are concerned, the technical routes and basic principles taken by temperature control integrators and energy storage system integrators are similar. The specific difference between the two is mainly reflected in the specific implementation form of product design, such as energy efficiency grade, structural layout, core component selection, refrigerant type, electronic and electrical design, etc.

　　Temperature control integrators are more focused on the development of liquid-cooled hosts, while energy storage system integrators are more focused on the needs of energy storage application scenarios, from multi-dimensional design selection, environmental conditions, heat dissipation requirements and reliability. Comprehensive consideration should be given to requirements, etc.

　　In the field of temperature control, temperature control integrators are still the most professional solution providers. It is believed that in the future, the joint research and development of liquid cooling systems by temperature control companies and system integrators will be an industry trend.

　　The liquid-cooling products currently on the market are actually a deep combination of the two, basically using the solution of liquid-cooled unit + pipeline + liquid-cooled box. The function of liquid cooling is to realize the temperature control of the lithium battery through the heat exchange between the refrigerant and the lithium battery, so that the lithium battery can work at a more suitable temperature and prolong the battery life. At the same time, when thermal runaway occurs in the battery, the spreading time of thermal runaway can be delayed. But it cannot fundamentally prevent the occurrence and spread of thermal runaway.

　　Q: What role can fire protection facilities play in the safety of lithium battery energy storage power stations?

　　A: Although energy storage devices represented by lithium-ion batteries have various advantages, lithium metal is the most active metal among known elements (including radioactive elements), and thermal runaway of lithium batteries occurs from time to time. The application of batteries in energy storage has buried safety hazards. On the other hand, EMS and PCS are closely combined with a large number of electronic and electrical components, high and low voltage wiring harnesses and their connecting components. Although the thermal runaway caused by high temperature and material aging is not as high as lithium batteries, it cannot be ignored.

　　The difference between a lithium battery energy storage power station and a conventional building is that a large number of lithium batteries are stored in a limited space, which has a large fire risk factor and a high degree of fire danger. Once the lithium battery is thermally out of control, it will be difficult to fight. A systemic fire is formed that burns down the entire container, and even explodes. In view of the particularity of the energy storage power station, the setting of the fire protection system is particularly important. In terms of fire fighting strategy, it should be based on early detection, accurate detection, early fire extinguishing and accurate fire extinguishing.

　　Fire protection facilities can limit the spread of some types of fires in the energy storage system, especially the early suppression of lithium batteries after thermal runaway, which can minimize the scope and extent of accidents.

　　In view of the characteristics of energy storage lithium battery fires, we can first start from the source, because the hidden dangers of energy storage fires mostly come from fires caused by abnormal batteries. Such fires penetrate deep into the hidden dangers and are not easily detected by staff, so they are detected early. It is particularly important to provide accurate and effective feedback of fire information to the fire disposal unit.

　　Secondly, the influence of the fire extinguishing agent on the conductivity of the battery should also be considered, so as to avoid expanding the damage and damage to the normal operation of the system. In order to ensure the safety of the overall battery system, it is still necessary to set up the ultimate fire protection facility in the enclosed large independent energy storage space. This facility must have the functions of rapid fire extinguishing and long-term heat absorption protection, and at the same time can effectively prevent The repeated combustion of fire can avoid the occurrence of secondary disasters and explosion accidents, and prevent the fire from spreading to a higher level.

　　Det Norske Veritas (DNV) released a report on the safety of lithium batteries in 2019, and the results showed that compressed air foam plays a role in fighting lithium battery fires, especially in terms of main fire extinguishing performance (including fire extinguishing ability, long-term Heat absorption rate and short-term heat absorption rate) are superior to other fire extinguishing methods, and have excellent anti-re-ignition performance, which will play a crucial role in lithium battery fire fighting.

　　Q: What are the main safety warning and prevention and control measures taken by lithium battery energy storage power stations?

　　A: The safety early warning measures of energy storage power stations mainly include early warning of abnormal operating parameters such as voltage and temperature of batteries and electrical equipment, early warning of fire danger signals (flammable gas, smoke, temperature), detection and early warning of battery system insulation faults, fire protection system/ Early warning of abnormal conditions such as sensor status / temperature control equipment / communication / flooding; mainly controlled and protected by BMS, PCS and EMS of the energy storage system.

　　Generally speaking, it is necessary to detect the hierarchical arrangement of energy storage battery compartments, battery clusters, and battery pack boxes, monitor the real-time data of the battery operation cycle, and collect, analyze and judge the characteristic data of battery thermal runaway. Different levels of detection alarms are made at different stages, and different prevention and control measures are made.

　　In addition, the site selection of the lithium battery energy storage power station, the planning of the station area, the fire separation distance of a certain distance, the fire escape, etc., these issues must be considered.

　　Q: How much is the cost of safety facilities for lithium battery energy storage power stations?

　　A: Taking a 1MW energy storage container as an example, the expenditure on traditional energy storage temperature control, safety warning, and fire extinguishing solutions accounts for about 1%-4%. In the future, after the energy storage security solution technology is upgraded to the dimension of accurate detection, the proportion of expenditure will increase to 5%-8%.

　　Q: What causes a fire in a lithium battery energy storage power station?

　　A: At present, the main reasons for fires in lithium battery energy storage power stations are mechanical abuse, electrical abuse and thermal abuse; lithium-ion battery materials themselves have the basic conditions of being inflammable and explosive due to their extremely high energy ratio and extremely high activity. Lithium-ion fires are mainly due to overcharge and overdischarge, resulting in thermal runaway of single lithium batteries if they cannot be extinguished in time, which will lead to thermal runaway in severe cases. The inability to quickly and effectively dissipate heat leads to the spread of risk to the lithium battery pack to the entire energy storage power station.

　　From the global energy storage power station fire cases, the causes of thermal runaway are mostly electrolyte leakage, overcharge and overdischarge, short circuit in the cell, insulation failure, cable damage, and some improper construction.

　　Q: How to promote the safe and sustainable development of energy storage?

　　A: The safety prevention and control of energy storage power stations runs through many key links in the entire life cycle of lithium battery manufacturing, power station design and construction, operation and maintenance, and emergency response to accidents. In the future, it is necessary to use big data analysis and sensitive multi-level monitoring to finally establish a lithium battery operation database, improve the online status assessment and active safety warning of the energy storage system, and optimize the operation and maintenance strategy of the energy storage power station.

　　Q: How to choose a suitable lithium battery energy storage system for my family or my own place?

　　A: Choose high-quality suppliers, don't give up understanding of excellent products because of price differences! At the same time, it is necessary to pay attention to whether the supplier has enough years of operation and rich industry experience.

　　SES Power is a good choice for you. Our energy storage products use batteries from well-known brands, such as EVE, CATL, and BYD. The voltage range of our products is from 12V to 560V, and the capacity is from 1KWh to 1MWh, covering lead-acid replacement, industrial matching, UPS, RV, solar energy storage, home energy storage and so on. Almost all of these products are standardized, modularized, integrate RS485, CAN and other communication protocols, support remote monitoring and operation, and add AI intelligent analysis and cloud storage to the new generation of systems, which can ensure system compatibility, high speed, and reliability.