Testing, scoring and verification are terms and terms of project developers and investors like. After all, these measures can reduce investment risks, add trust in new technologies, no matter which industry. Considering this, the Global Quality Assurance and Risk Management Consultative Norway DNVGL has announced the third generation of battery performance scorecards.
. In this year’s evaluation this year, 22 battery manufacturers serve the battery products for DNVGL battery scorecards..
The company said that even if there is no battery manufacturer is willing to disclose its name, DNVGL will continue to work with its technical partners to increase transparency, and this is still a continuous process.. Industry analysts said that the development trend of technology and market in recent years, the lithium phosphate ion battery (LFP) is once again welcomed, including batteries for fixed energy storage systems.
. This battery has dominated the market in 2012 to 2015, but after 2016, it was replaced by NiM manganese cobalt (NMC) ternary lithium ion batteries and nickel-cobalt aluminum (NCA) ternary lithium ion batteries..
However, current CATL and BYD have seen such battery manufacturers to develop potential and trends to promote the development and production of lithium iron phosphate ion batteries (LFP) technology.. The third annual battery scorecard released by DNVGL has tested 22 charge and discharge and temperature-dependent behaviors with different chemical properties, and identified important product trends.
. The battery capacity is increasing another significant trend is that the battery capacity of the energy storage system is getting bigger and larger, and the current lithium iron ion battery capacity is about 200AH..
The reason is that the battery cells with large capacity can save raw materials costs.. It is expected that there will be further innovations in the selection of electrode materials, battery structures and system architecture, and in the next few years, major innovation in battery technology does not appear.
DNVGL believes that lithium-ion batteries still maintain its preferred position in the energy storage area. The company said that it is expected that other battery technology will not replace lithium-ion batteries in the next three to seven years, as lithium-ion batteries will benefit from the scale of transportation, consumer electronics and energy storage applications..
According to DNVGL, the current cost of the lithium-ion battery is about $ 100 / kWh. The company’s analyst predicts that the price of battery energy storage systems will drop sharply in the next decade..
Another trend to deploy more solar + energy storage project analysts is the increasing energy storage system and solar electrical facilities or wind power consistent deployment. Therefore, the energy storage project developer and the user require its battery energy storage system for 20 to 25 years to match the working life of solar cell power generation facilities..
Developers who deploy the grid size battery energy storage system have responded to this demand, including comprehensive overhaul, enhancement, operation and maintenance services in the deployment contract of the battery energy storage system.. DNVGL said that the use of batteries will also change.
In early applications of the energy storage system, commercial service projects are important to user-side energy storage systems.. Nowadays, more and more battery energy storage systems should transfer solar power from during the day to move to night.
. This puts different requirements for battery technology, including charging and discharge stability and degradation of batteries in different charging conditions..
DNVGL tested the charge and discharge stability of 22 products of the scorecard, and determined that the charge and discharge capacity required to cause 1% capacity loss.. In this year’s scorecard, the number of charge and discharge charges required for capacity loss is 381 times, and these different batteries have great differences in this aspect: lithium iron phosphate ion battery is 135 ~ 448 times, NMC three The lithium-ion battery is 180 ~ 849, the NCA battery is 143 ~ 330 times, and the best titanate battery is 1,067 times.
. The capacity statistics after the charge and discharge are based on the tests made by the research institution. On average, the battery will drop to 90% of the nameplate capacity after 1800 charge and discharge.
. The scorecard emphasizes the ability to understand this degradation as a function of temperature. If all charge and discharge are carried out at 10 ¡ã C, then the battery capacity will fall to about 85% after 1000 charge and discharge.
. DNVGL’s test team observed this temperature sensitivity in all battery products..
The titanate battery is best in this regard, still maintains 90% of the nameplate after 8609 charge and discharge.. There are also two types of NMC ternary lithium-ion battery products that follow thereafter, with a capacity of 10% after 6410 and 4,500 charging, respectively.
. In terms of charging status (SOC), the scorecard found a 50% ~ 80% SOC window, and the NMC ternary lithium-ion battery is more prone to degradation in this window..
And the lithium iron phosphate ion battery (LFP) is often degraded at 30% to 40% SOC window period.. DNVGL said that the evaluation of important degraded vectors in battery projects is SOC, charge rate, temperature, this is essential.
The latter is usually an important reason for the degradation of the battery.. Scorecard researchers say that depending on the battery characteristics, depending on the SOC’s work range may be a secondary consideration.
Charging rate is more important, lower charging speed is usually favorable for battery operation. In DNVGL test, the lithium phosphate ion battery (LFP) and the titanate battery typically have a higher charge rate, although the tester pointed out that many NMC ternary lithium ion batteries are also good, but there is a temperature at high charge rate. Elevated disadvantage.
Score card researchers also pointed out security development. Standards such as the UL9540A protocol require an improvement test and have taken a step toward safety transparency..
But DNVGL said that the lack of new standards and unqualified standards is confusing. The containerized energy storage solution is constantly evolving, which means you can fully access the battery energy storage system from the outside, prevent operation and maintenance personnel from entering the container risk..
DNV-GL score card researchers added, many battery suppliers are committed to improving battery fire safety standards and preventing thermal out-of control chain.