21700 Tabless Battery
| Model No. | INR21700-40PL |
| Type | Lithium-ion rechargeable cell |
| Norminal Voltage | 3.60V |
| Standard Discharge Capacity | Min. 4000mAh |
| Charge at 2.0A(0.5C),4.20V, CCCV 0.1A Cut-off | |
| Discharge at 2.0A(0.5C), 2.50V Cut-off | |
| 1C=4000mA | |
| Standard Charge | 2.0A(0.5C), 4.20±0.05V, CCCV0.1A Cut-off |
| Max. Charge | 8.0A(2.0C), 4.20±0.05V, CCCV0.1A Cut-off |
| Standard Discharge | 0.8A(0.2C), 2.50V Cut-off |
| Max. Discharge | 70A(17.5C), 2.50V with Temperature Cut-off |
| Temp. Recommended:75℃ | |
| Temp. Max.: 80℃ | |
| Charge/Discharge Voltage Range: | 4.20~2.50V |
| Ambient Temperature | |
| Charge | 0~45℃ |
| Discharge | -20~60℃ |
| Operating Temperature (Cell Surface) | |
| Charge Temp. | 0~60℃ |
| Recommended Recharge Release | <45℃ |
| Discharge Temp. | -20~80℃ |
| Recommended Recharge Release | <60℃ |
| Storage Temperature (At Shipping SOC) | |
| 1 Year | -20~25℃ |
| 3 Months | -20~45℃ |
| 1 Month | -20~60℃ |
| Cell Weight | Max. 67.0g |
| Cell Dimension | Height: 70.15±0.15mm |
| Diameter: 21.15±0.10mm |
A tabless battery represents a significant design evolution in lithium-ion cell architecture, moving beyond the limitations of traditional configurations. Conventional batteries utilize metal tabs—one positive and one negative—that are welded to the internal electrode materials (the cathode and anode) and extend out of the cell casing to serve as the external electrical terminals. While functional, this design creates inherent bottlenecks.
The primary limitations of tabbed batteries are electrical resistance and thermal inefficiency. Current must travel along the entire length of the electrode foil to reach the small, discrete tab. This long, constrained path creates significant electrical resistance, which in turn generates heat and limits the rate of charge and discharge. This design also creates uneven current distribution and thermal hotspots, which can accelerate degradation and pose challenges for safety and power delivery.
The tabless design, famously commercialized as Tesla’s “4680” cell, addresses these issues by re-engineering the current collector. Instead of using small, welded tabs, the foil of the electrode itself is laser-patterned and formed in a way that allows the entire edge of the jelly roll to act as a collective tab. This creates a continuous, low-resistance path for electrical current.
The advantages of this architecture are substantial. By minimizing resistance, tabless batteries can achieve much higher power output, enabling faster acceleration in EVs and quicker charging times. The more direct current path also reduces heat generation, leading to improved thermal management, enhanced safety, and longer overall cell lifespan. Furthermore, the simplified manufacturing process, which eliminates precise tab welding, can reduce production costs and potential failure points.
In summary, the tabless battery is not a change in chemistry, but a transformative structural innovation. It overcomes key limitations of energy density, power output, and thermal performance, marking a critical step forward in the development of more efficient, powerful, and scalable energy storage solutions.
The primary limitations of tabbed batteries are electrical resistance and thermal inefficiency. Current must travel along the entire length of the electrode foil to reach the small, discrete tab. This long, constrained path creates significant electrical resistance, which in turn generates heat and limits the rate of charge and discharge. This design also creates uneven current distribution and thermal hotspots, which can accelerate degradation and pose challenges for safety and power delivery.
The tabless design, famously commercialized as Tesla’s “4680” cell, addresses these issues by re-engineering the current collector. Instead of using small, welded tabs, the foil of the electrode itself is laser-patterned and formed in a way that allows the entire edge of the jelly roll to act as a collective tab. This creates a continuous, low-resistance path for electrical current.
The advantages of this architecture are substantial. By minimizing resistance, tabless batteries can achieve much higher power output, enabling faster acceleration in EVs and quicker charging times. The more direct current path also reduces heat generation, leading to improved thermal management, enhanced safety, and longer overall cell lifespan. Furthermore, the simplified manufacturing process, which eliminates precise tab welding, can reduce production costs and potential failure points.
In summary, the tabless battery is not a change in chemistry, but a transformative structural innovation. It overcomes key limitations of energy density, power output, and thermal performance, marking a critical step forward in the development of more efficient, powerful, and scalable energy storage solutions.
| 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 |
EVE Energy Co., Ltd. is a leading global lithium-ion battery manufacturer and a key player in the international battery market. With over two decades of experience, EVE is renowned for its strong R&D capabilities and production excellence, supplying advanced energy storage solutions for a wide range of applications, including electric vehicles (EVs), consumer electronics, and grid storage.
A significant product in EVE's portfolio is its 21700 tabless battery. This cell represents a strategic fusion of a proven form factor with a cutting-edge internal design. The "21700" designation refers to its cylindrical dimensions (21mm by 70mm), a size popularized for its excellent balance of energy capacity and power delivery. The "tabless" component, however, is the key innovation.
Moving beyond traditional designs that rely on small, welded tabs, EVE's tabless architecture re-engineers the current collector. This design creates a continuous, low-resistance path for electrical current across the entire electrode, effectively turning the entire jelly roll edge into a collective tab. This breakthrough addresses core limitations of conventional batteries.
The benefits of EVE's 21700 tabless battery are substantial. It significantly reduces internal electrical resistance, which translates into multiple performance advantages: higher power output for improved vehicle acceleration, faster charging capabilities, and superior thermal management. The reduced heat generation enhances both safety and the long-term cycle life of the cell.
By integrating the efficient 21700 format with a proprietary tabless design, EVE Energy has developed a high-performance power cell that meets the escalating demands of the modern EV industry for greater range, faster charging, and enhanced reliability.
A significant product in EVE's portfolio is its 21700 tabless battery. This cell represents a strategic fusion of a proven form factor with a cutting-edge internal design. The "21700" designation refers to its cylindrical dimensions (21mm by 70mm), a size popularized for its excellent balance of energy capacity and power delivery. The "tabless" component, however, is the key innovation.
Moving beyond traditional designs that rely on small, welded tabs, EVE's tabless architecture re-engineers the current collector. This design creates a continuous, low-resistance path for electrical current across the entire electrode, effectively turning the entire jelly roll edge into a collective tab. This breakthrough addresses core limitations of conventional batteries.
The benefits of EVE's 21700 tabless battery are substantial. It significantly reduces internal electrical resistance, which translates into multiple performance advantages: higher power output for improved vehicle acceleration, faster charging capabilities, and superior thermal management. The reduced heat generation enhances both safety and the long-term cycle life of the cell.
By integrating the efficient 21700 format with a proprietary tabless design, EVE Energy has developed a high-performance power cell that meets the escalating demands of the modern EV industry for greater range, faster charging, and enhanced reliability.
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