Tabless 21700 Battery

Tabless batteries represent a significant advancement in lithium-ion cell design, fundamentally improving upon the conventional cylindrical format. Traditional cells rely on discrete, localized metal tabs to collect current from the coiled electrode layers (the "jelly roll"). These tabs create a bottleneck, forcing electrons to travel long distances, which results in higher internal resistance and substantial heat generation, particularly during high-power use or fast charging.

The "tabless" architecture, also sometimes referred to as multi-tab or continuous current collection, eliminates this bottleneck. Instead of relying on a few connection points, the entire edge of the spirally wound anode and cathode layers acts as a continuous pathway for current flow.

This innovative design offers crucial performance benefits:

• Reduced Internal Resistance: Shorter electron pathways dramatically lower ohmic resistance, increasing efficiency.
  
• Enhanced Thermal Management: Less resistance leads to significantly reduced heat generation, improving safety and battery lifespan.
  
• Higher Power and Faster Charging: Lower resistance allows for higher current output and accelerated charging rates without undue degradation.
  
• Scalability: The design is crucial for safely and efficiently scaling up to larger cell formats, such as the 4680 cell.
  
  

Tabless batteries are quickly becoming a key enabler for next-generation Electric Vehicles (EVs), high-performance power tools, and other demanding applications, promising superior performance, durability, and a more efficient energy future.

Tabless Models	Reference
INR18650-JP30	18650 Tabless Battery
INR18650-30PL	Tabless 18650 Battery
INR18650-30XG	Tabless Battery 18650
INR21700-RS40	21700 Tabless Cell
INR21700-40PL	21700 Tabless Battery
INR21700-JP40	Tabless 21700 Cells
INR21700-40XG	Tabless 21700 40XG Battery
INR21700-40P	Tabless Lithium Cell
INR21700-42P	Tabless Li ion Cells
INR2170-45D	Tabless 21700 Battery
INR2170-50D	Tabless 21700 50D Battery
INR21700-50PL	Tabless 21700
INR21700-RS50	21700 Tabless
INR21700-50XG	21700 Tabless Cells
INR21700-RH60	Tabless Cells 21700
4680 Tesla Battery	4680 Tabless Battery

BAK Battery, a globally recognized leader in the lithium-ion energy sector founded in 2001, specializes in advanced battery solutions for new energy vehicles, consumer electronics, and energy storage. The company has continually pushed the boundaries of cylindrical cell performance, most recently by pioneering the next generation of high-power batteries with its 21700 Tabless Cell.

The 21700 cell, measuring 21mm by 70mm, is already an industry standard for high-capacity applications. BAK’s breakthrough lies in integrating the tabless or continuous current collection architecture into this format. This design fundamentally eliminates the localized bottleneck of traditional tabs, allowing electrons to exit along the entire edge of the coiled electrode.

This innovation dramatically reduces the internal electrical resistance to single-digit milliohms (mΩ), which translates directly into superior operational characteristics. BAK's tabless 21700 cells, such as the INR2170-45D, offer ultra-high power output (with discharge rates reaching up to 60A and beyond) and significantly improved thermal management. The reduced heat generation enhances safety, extends the cycle life, and enables ultra-fast charging, with some models reaching 80% charge in as little as 15 minutes.

By optimizing power density, thermal stability, and charging speed, BAK Battery's 21700 tabless technology is strategically positioned to power demanding applications in the micromobility, power tool, and high-performance EV markets, establishing the company at the forefront of the battery evolution.