With the blessing of domestic and foreign policies and the active promotion of ZF in various countries, the new energy industry has shown a good growth trend in technological innovation, market expansion and user acceptance in recent years. Taking the application of energy storage as an example, its broad development prospects will create great value for the economic growth and green energy development of various countries.
However, as an emerging technology industry, there are still some problems in its development at this stage, among which the most urgent need to be solved is that all parties need to work together to focus on the safety performance of energy storage products, so as to develop and tap a number of market segments that can achieve profit peaks for the energy storage industry, so as to realize the healthy and sustainable development of the industry.
UL 1973
standard Introduction
the first edition of UL 1973, released on February 15, 2013, is the world's first safety standard for energy storage battery systems. The standard mainly covers all kinds of energy storage batteries used in photovoltaic, wind energy, backup power supply and communication base stations, and includes structural evaluation and test evaluation of energy storage batteries.
Related Q & A
q1: For internal fire tests, how to determine thermal runaway? Is there a unified criterion?
A1: Thermal runaway is defined as the temperature rise of the cell, causing the exothermic reaction of the cell, thus further aggravating the temperature rise of the cell, resulting in more reactions and uncontrollable state of temperature rise. When heat cannot be effectively released, thermal runaway often causes fire or explosion. Simply put, when thermal runaway, the temperature of the battery core will rise sharply, and a short circuit will occur inside the battery core, resulting in a sharp drop in the voltage of the battery core. At present, there are many kinds of chemical substances in lithium-ion batteries on the market, such as lithium iron phosphate batteries, ternary material batteries, etc., and the thermal performance of each chemical substance battery is different, so their thermal runaway The phenomenon and reaction degree are also inconsistent, so there is no unified criterion.
Q2: For the internal fire test, what is the criterion for passing the test? Is it allowed for the internal battery cell of the battery pack to catch fire or explode?
A2: The criterion for passing the internal fire test is that the flame cannot spread to the outside of the battery pack and the battery pack cannot explode. This test allows the battery pack to catch fire or explode.
Q3: For the internal fire test, are other cells allowed to catch fire or deflate except the thermally out-of-control cells?
A3: Allow other cells to catch fire or deflate, as long as there is no flame outside the battery pack or the battery pack does not explode.
Q4: Can the company's production of all-vanadium redox flow batteries be evaluated by UL 1973 standards?
A4: Yes. UL 1973 can evaluate not only lithium-ion batteries, but also supercapacitor systems, flow batteries, and high-temperature sodium batteries. Batteries for energy storage applications and various types of electrochemical battery systems used in LER light rails can be evaluated with UL 1973.
UL 9540
standard Introduction
standard for safety of energy storage systems and equipment, which applies to EPS energy storage systems that receive and store certain energy, provide electrical energy to loads or supply power to the utility grid. The energy storage system applicable to this standard can be a single application mode system (such as self-powered system), or a parallel power system or transmission grid power supply system or a parallel operation mode application system.
Related Q & A
q1: Is mandatory certification required for energy storage systems to enter the North American market?
A1: Last year, the National Fire Protection Association released NEC version 2017 with new Article706. According to the requirements of the energy storage system, it is clearly stipulated that the key components of the energy storage system or the energy storage system need to be certified. NEC regulations are widely adopted as local regulations by state judicial bureaus in the United States. Once NEC 2017 is adopted as local regulations, it is mandatory and requires compulsory certification.
Q2: How long is the certification cycle of energy storage system?
A2: There are various specifications of energy storage systems, from small wall-mounted energy storage systems to large container energy storage systems. In addition, there are many key components in the energy storage system. If some components have not been certified, they need to be randomly tested or changed, which will also lengthen the certification cycle. Therefore, the certification cycle difference of the whole system will be relatively large. Considering the complexity of the energy storage system, it is recommended that the customer step-by-step certification, first open a structural audit project, confirm the structural compliance and test list, and then open a formal certification project. For small indoor use energy storage systems, inverters and other key components have been certified, and the general certification period is 8 to 10 weeks.
Q3:LER battery impact test, whether all three axial impact?
A3: Yes, all three axes have to be impacted.
IEC 62619
standard Introduction
safety standard for large-scale lithium batteries, covering: telecommunications base stations, uninterruptible power supplies (UPS), electrical energy storage systems, emergency power supplies and similar applications, forklifts, golf carts, automated guided vehicles (AGV), railway and marine applications (excluding road vehicles).
Related Q & A
q: Can I apply to UL for IEC 62619 certification now?
A:IEC 62619 was officially released in February this year. It is a safety standard for energy storage and industrial lithium-ion batteries, including the safety assessment of lithium-ion battery cells and battery packs. So far, UL Suzhou laboratory, UL Guangzhou laboratory and UL Taiwan laboratory are the first and only three laboratories in the world to obtain IEC 62619 CBTL qualification. At present, we can accept the certification of IEC 62619. If your company's products successfully pass the assessment, you can obtain the IEC 62619 CB certificate and report. Currently, only UL can issue IEC 62619 CB certificates and reports.
UL 991 & UL 1998
standard Introduction
evaluation criteria for BMS functional safety, where UL 991 is electronic control circuit hardware safety and UL 1998 is software safety.
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