At this stage, the number of hundreds of megawatt-level projects that have been put into production, planned and under construction in China is increasing, and the number of GWh energy storage projects is also increasing simultaneously. In addition to the scale of power stations, long-term energy storage projects of 4 hours and above are also increasing.

As of the end of the first quarter of 2024, National Energy Administration data shows that the average energy storage time of new energy storage projects nationwide is 2.2 hours, 74.6% of the installed capacity of projects with 2-4 hours, and 12.5% of the installed capacity of projects with more than 4 hours.

However, the current mainstream lithium iron phosphate material system with a 2-hour energy storage time cannot meet the needs of new power systems with high wind and solar output. If the lithium iron phosphate energy storage system is to meet the long-term energy storage needs of more than 4 hours, it needs large-capacity cells and systems as support.

At present, more than 10 battery companies have deployed 500Ah+ batteries and larger-capacity energy storage systems, bringing new design languages in terms of battery cell form, material system, and safety design.

Against this background, REPT brought the latest 587Ah and 625Ah energy storage lifepo4 battery and 7.03MWh energy storage system products to this SNEC.

Large-capacity power stations and long-term energy storage have increased the overall requirements for battery cells, including increased charge capacity and optimization of safety.

In this regard, REPT's 587Ah energy storage lifepo4 battery has ultra-large capacity and ultra-high energy of 1878Wh, with an energy efficiency of 96.5%, an ultra-long cycle life of 12,000+ times, zero attenuation for five years, and ultra-durable use for 25-30 years, and should be used Large storage is needed to achieve a new balance between service life and economic benefits.

At present, the service life of photovoltaic power stations is generally about 20 years. In the future, large-scale energy storage deployment needs to consider the issue of "same life of light and storage". Considering the capacity fading of energy storage batteries, the breakthrough of 12,000 and 15,000 cycle lifespan is closer to 20 years. and above service life.

Therefore, REPT's 587Ah energy storage cell has an ultra-long cycle life of 12,000+ times and a service life of 25-30 years, which means that it is comparable to the operating time of a photovoltaic power station, and the economic problems of photovoltaic power station distribution and storage can also be effectively improved.

In terms of structure, the 587Ah energy storage cell adopts REPT's original top-top design, which reduces the redundant electronic impedance of the tabs by 16%, improves safety, stability and reliability, and increases the internal utilization rate by 3%, achieving ultimate space utilization.

Innovation in the material system, the 587Ah top energy storage cell adopts dual high solid-liquid interface technology, which increases the ion migration rate by 30%. Upgrade the low-slow decay and high-loss lithium technology and use low-slow decay and high-loss lithium electrode materials to achieve ultra-long cycle life.

When the capacity of energy storage cells increases to above 600Ah, the mainstream battery manufacturers' approach is to make the batteries shorter, thinner, and in the shape of a blade.

On the one hand, making the large-capacity battery core shorter can reduce the temperature rise of the battery core; making it thinner has a larger specific surface area, which is conducive to heat dissipation and lower temperature rise, which greatly improves the safety of the energy storage battery core. On the other hand, blade batteries mostly use lamination technology based on their morphological characteristics, which improves manufacturing efficiency.

The REPT 625Ah energy storage cell is based on the blade shape and uses the lamination process. Not only that, the battery cell also adopts a same-side tab design to achieve ultimate space utilization, increase the energy density by 1.3%, and upgrade the interface stability.

It is worth mentioning that the higher the system voltage and power, the smaller the line loss, the higher the overall power conversion efficiency, and the lower the cost of electricity. However, higher voltages place higher safety requirements on battery cells.

In this regard, REPT 625Ah energy storage battery adopts thermoelectric separation and 2000V insulated high-voltage design to achieve ultra-high safety and reliability.

In terms of green empowerment, large-capacity top batteries are used in terminal systems, and the energy storage system has entered the 6.5+MWh era. Carbon emissions can be effectively reduced by 84.8 tons/day, and the return on investment increases by 18.7%. REPT 625Ah energy storage cells will be mass-produced in the second quarter of 2025.

REPT energy storage system “further” upgrade:

On June 14, REPT released a new generation of 7.03MWh energy storage system, equipped with REPT587Ah top energy storage cells. The battery life is 25-30 years, and the cycle life of 12,000 times can achieve zero decay for 5 years, directly empowering terminals. system.

REPT’s logic in laying out the 7.03MWh energy storage system lies in “preparation for war.” At present, REPT's series of products above 5MWh include two models of 5.11MWh and 5.51MWh currently in service, as well as two models of 6.25MWh and 7.03MWh in reserve.

From the perspective of current products, the REPT 5.51MWh energy storage battery cabin was the first to achieve mass production and batch delivery in February this year. Compared with the mainstream 5MWh container, it saves 9.1% in transportation costs, saves 5% in debugging costs, and covers an area of A 10% reduction and a 9.5% savings in firmware costs.

Compared with the previous generation 5.11MWh energy storage system, the energy efficiency of REPT's new generation 7.03MWh energy storage system has exceeded 96%, the area energy density has increased by 40%, and land investment has been saved by 25%.

Calculating the initial investment cost based on a conventional project capacity of 100MW, the large-capacity standard 20-foot 5MWh liquid-cooled energy storage system saves 43% of the area and 26% of the cost compared to the mainstream 3.72MWh product.

What the REPT 7.03MWh energy storage system achieves is performance improvement and cost efficiency improvement beyond the second generation of mainstream products. It is not only an upgrade to the 280Ah+3.7MWh energy storage system, but also a transcendence of the 314Ah+5MWh energy storage system.