Sodium ion batteries have begun the countdown to mass production. According to statistics, household energy stored battery shipments in 2022 will be 25 GWh, up 354.5% year-on-year.
In 2023, driven by the energy situation, the high prosperity of household energy storage will continue. Relevant analysis believes that sodium ion batteries are expected to have significant potential in household energy stored due to their adaptability and performance.
In this background, many related sodium battery companies jointly discussed the opportunities and challenges of sodium batteries in the field of household energy storage.
1. Overview of household energy storage cells
From the perspective of current household batteries, the main ones are still 100 Ah and 50 Ah prismatic aluminum LFP cells. However, lifepo4 batteries dominated by the 40 and 46 series are entering the home energy storage market.
At the level of monomer capacity, the form of household storage cells mainly includes prismatic, large cylindrical and pouch packaging. Among them, the single capacity of the large cylinder is 10 Ah–50 Ah, the prismatic 50 Ah–300 Ah, and the pouch 30 Ah–80 Ah.
This is not much different from the current form of sodium batteries. From the perspective of technical trends, the cycle requirements of household storage LFP cells in 2022 are moving towards more than 6,000 times, and the rate requirements are to reach 1C charge and discharge. Due to the high prosperity of home energy storage, the price of he cells was generally better last year.
2. Applied to household energy storage
Based on the market environment of household storage lithium batteries moving towards better industry prices, how sodium ion batteries fit into the household stored energy track is worth discussing in the industry.
Compared with the application in the field of large-scale energy of storage, more people in the industry believe that sodium ion batteries are more suitable for household energy storage, portable energy storage, UPS, base station energy storage and other use scenarios at this stage.
Accelerate the layout of sodium ion batteries, support the demonstration and application of sodium ion batteries in energy of storage, electric two-wheelers, micro-electric vehicles, 5G base stations and other fields, and promote cooperation in sodium ion battery stored energy projects.
3. Advantages of sodium-ion batteries in household energy storage
In fact, use scenarios such as household energy storage have become the application direction of sodium batteries generally recognized in the industry.
The analysis believes that sodium ion batteries have the following main advantages in the field of energy storage for home use: It is estimated that the cost of sodium ion batteries after mass production is about 0.3–0.5 RMB per Wh, and the current cost is about 0.5–0.7 RMB per Wh, which is basically the same as LFP batteries.
● Better low-temperature performance
In terms of charging and discharging, the battery has better low temperature performance, with a capacity retention rate of 70% at -40°C. Based on the low temperature performance of the battery, it is more suitable for users to install stored energy in outdoor use scenarios.
At present, home to store energy mainly consists of wall mounted battery and stacked types. If it is Northern Europe, Russia and other regions, a sodium battery home energy storage system can be used normally outdoors.
● Better discharge rate
The battery discharge rate is better than that of LFP batteries. The solvation energy of sodium ions is lower than that of lithium ions. That is, it has a better ability to diffuse interfacial ions.
At the same time, the same concentration of electrolyte has a higher ion conductivity than lithium salt electrolyte. Therefore, the rate performance of sodium ion batteries is better, the power output and acceptance capacity are stronger, and the sodium ion batteries disclosed have a charge and discharge rate of 3C and above.
● The number of storage cells in Safer
households is small, generally only 20–40 cells, the capacity is less than or equal to 100 Ah, and the consistency and safety control are easier. The current sodium ion battery cycle life can reach 400–5000 cycles.
According to the daily charge and discharge, the sodium ion battery can meet the requirements of home to store energy. The small volume of household storage products and the low volumetric energy density of sodium ion batteries will not have much impact on cost and floor space.
Overall, with the acceleration of the industrialization of sodium ion batteries, it is expected to accelerate the penetration of home to store energy scenarios.
4. Sodium battery layout tracking
In the field of household energy storage, the top 10 home energy storage battery companies have also accelerated the layout of sodium ion batteries. The Great Power said the energy density of the company's non-negative vanadium sodium phosphate system exceeds 160 watt-hours per kilogram.
At the same time, on the product side, mass production products with a cycle life of more than 6,000 times are launched. Currently, the company has tried to apply sodium ions to the field of household energy storage with some customers.
The sodium electric production process is basically the same as the current lithium battery production process, and there is no bottleneck in production capacity, and sodium electric production can be switched at any time according to market demand.
● Energy storage field companies
The application of sodium ion batteries is realized in home storage energy systems, distributed energy storage cabinet systems, and container energy storage cabinet systems.
As early as January 2022, the world's first officially installed sodium ion battery home energy storage system officially appeared, and the sodium ion battery was completely independently developed by high-tech companies.
The fast charging and low temperature performance of golf carts and household energy storage tracks make sodium-ion batteries have advantages inyhis field and other fields, but at present, sodium-ion batteries have not yet been mass-produced, although researchers have been paying attention to the field of sodium batteries.