Chilwee Group, established in 1998, stands as a global leader in the new energy sector. The company excels in manufacturing, selling, researching, and recycling a comprehensive range of cutting-edge batteries. Its portfolio includes SLA batteries (AGM, GEL, and lead carbon), lithium-ion batteries, sodium-ion batteries, and sodium salt batteries. These products power diverse applications, such as electric bicycles, electric vehicles, forklifts, tools, renewable energy storage (solar and wind), backup power (telecommunications, UPS, and emergency lighting), and automotive systems. Additionally, Chilwee produces advanced zinc-nickel rechargeable batteries, offering a superior alternative to traditional AA and AAA options.
In an exclusive conversation with The Interview World, Indraneel Pawar, Sales Manager of the Overseas Business Unit at Chilwee Group, shared valuable insights. He delved into the unique features of sodium-ion batteries, explained their energy storage capabilities and versatile applications, and emphasized their growing demand in India. Pawar also highlighted the exceptional durability of these batteries, making them a promising solution for sustainable energy needs. Here are the key highlights from this engaging discussion.
Q: Could you elaborate on the distinctive features of sodium-ion batteries and how they compare to other battery technologies?
A: Graphene batteries, being basic lead-acid batteries, have their limitations. Lithium-ion batteries, while widely used, pose a fire risk. In contrast, sodium-ion batteries are exceptionally safe. Sodium, being a type of salt, prevents the risk of fire. Moreover, sodium-ion batteries can charge and discharge even at temperatures as low as minus 40 degrees Celsius—something lithium-ion batteries cannot handle. While lithium-ion batteries discharge down to minus 10 degrees Celsius, they cannot charge below zero degrees. In extreme environments like Siachen and Ladakh, the batteries must rise above zero before they can function.
On the other hand, sodium-ion batteries perform well in such conditions, charging and discharging even in sub-zero temperatures. Additionally, their thermal runaway point reaches up to 530 degrees Celsius, far beyond the point where they would catch fire. As a result, sodium-ion batteries are significantly safer than lithium-ion alternatives.
Q: What is the energy storage capacity of these batteries, and how does it align with their intended applications?
A: We currently offer 2.8-volt cells with capacities of 20 Ah and 33 Ah. In January or February next year, we will launch our 50 Ah cell, enabling a versatile range of configurations. With this combination, you can achieve virtually any capacity, with the 50 Ah cell serving as the base. These batteries are ideal for all electric vehicles. Additionally, they are suitable for solar applications, telecom operations, and stationary systems.
Q: How has the Indian market responded to sodium-ion batteries, and what trends or feedback have you observed so far?
A: We are receiving positive feedback for our sodium-ion batteries, though they are currently in the testing phase. Ongoing validation efforts are taking place, and we anticipate that by June or July next year, the technology will be ready for widespread use.
Q: What are your strategic plans for these products in the Indian market?
A: Sodium-ion batteries are specifically designed for use in e-rickshaws, particularly in the L5 category, due to their safety features and ability to withstand high summer temperatures.
Though it’s a new product, sodium-ion batteries have the potential to capture a significant share of the lithium-ion market. While our lithium-ion batteries are safe, mishaps often occur due to improper handling, subpar battery management systems (BMS), or the use of low-quality or second-hand cells, which can lead to fires. In contrast, sodium-ion batteries eliminate this risk, as they are inherently fire-resistant.
Q: How durable are sodium-ion batteries, and what is their expected lifespan compared to other battery technologies?
A: Sodium-ion batteries offer an impressive lifespan of 3,500 recharge cycles. In contrast, lithium-ion batteries typically last no more than 2,000 cycles. While some claims suggest 4,600 cycles, the actual performance is closer to 2,000. At the pack level, this number drops further to around 1,200 cycles.
Q: What innovations are you focusing on to enhance the performance and applicability of sodium-ion batteries?
A: Sodium-ion batteries themselves represent a significant innovation. Currently, only two or three suppliers in China are manufacturing them. In India, no one is producing sodium-ion batteries, and even in the case of lithium-ion batteries, the manufacturing landscape is limited. While a few have begun producing smaller cells, we will be the pioneers in sodium-ion battery production in India, leading the industry forward.
