Molicel INR-21700-P50S: High-Density 5.0 Ah Low flammability Designed for Long-Term Backup Applications

The Molicel INR-21700-P50S is a high-density 5.0 Ah battery designed specifically to meet the demands of long-term backup applications. Combining impressive energy capacity with reliable performance, this cell ensures consistent power delivery for critical systems over extended periods. Utilizing proprietary low flammability technology to achieve thermal stability, the P50S often results in controlled venting without flame propagation. In this article, we explore the features and chemistry of the INR-21700-P50S that make it an ideal choice for backup power solutions, highlighting its efficiency, durability, and suitability for the demanding AI data center  needs.

Key Specifications

• Model: INR‑21700‑P50S
• Series: Safety Cell
• Application: Backup Battery Units (BBUs\
• Cell Type / Form: 21700, Cylindrical
• Nominal Voltage: 3.6 V
• Typical Capacity: 5.0 Ah
• Standard Charge Current: 5 A
• Maximum Discharge Current: 100 A (high-power capability for emergency activation)
• Energy Density:
  • Volumetric: 714 Wh/L – allows compact, space-efficient packs.
  • Gravimetric: 260 Wh/kg – keeps battery packs relatively lightweight.
• Dimensions:
  • Diameter (Max): 21.55 mm
  • Height (Max): 70.15 mm
• Weight (Max): 71 g
• Form Factor Advantages: Compact cylindrical 21700 design enables high energy in small, portable backup solutions
• Special Features: Engineered for safety, long-term standby reliability, and consistent high-power output during sudden demand events.

This combination of high energy density, high discharge capability, and compact design makes the INR‑21700‑P50S ideal for modern backup applications.

High-Density Chemistry

The INR-21700-P50S uses advanced lithium-ion chemistry that packs a lot of energy into a small, lightweight cell. It stores more power without taking up extra space or adding unnecessary weight.

Key Points:

• High gravimetric energy density (260 Wh/kg): More energy per kilogram, resulting in lighter battery packs.
• Benefits: Enables backup units and emergency power devices to deliver longer runtime without increasing size or weight.
• Practical Effect: Devices and systems can run for a longer time between charges while still using a small, lightweight battery pack. This means more uptime without making the equipment bulky or harder to carry.

High-density chemistry lets the P50S store a lot of energy while staying small and lightweight. This is especially important for modern backup systems where space is limited and portability matters, because you get more runtime without needing a large or heavy battery pack.

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Optimized Cell Design

The INR-21700-P50S is built in the 21700 cylindrical size and shaped in a way that gives it the best mix of energy, power, and safety.

Key Features:

• Cylindrical 21700 format (21.55 mm × 70.15 mm): Provides a compact, robust form factor that fits efficiently in battery packs.
• Low internal resistance: Supports high discharge currents (up to 100 A) without excessive voltage drop or overheating.
• Reinforced internal structure: Improves durability, reduces mechanical stress, and enhances cycle life.
• Thermal stability: Designed to handle temperature fluctuations safely during charge, discharge, or standby operation.

Benefits:

• High power and energy delivery for sudden loads or continuous use.
• Compact and space-efficient packs BBUs(Battery Backup Units).
• Long-term reliability under repeated cycles or standby conditions.

The optimized design of the P50S ensures it delivers maximum performance, safety, and long-lasting performance in compact backup systems for high-demand applications.

Long-Term Reliability

The INR-21700-P50S is built to stay dependable even when it spends long periods in storage or standby mode. This makes it a great choice for backup and critical systems that must work instantly when needed, even after months or years of little use.

Key Points:

• Low self-discharge: Retains charge for long durations, ensuring readiness when needed.
• Stable chemistry: Reduces capacity fade over years of storage or intermittent use.
• Durable construction: Minimizes degradation during repeated charge/discharge cycles.
• Safe standby operation: Maintains performance even under extended idle conditions without compromising safety.

Benefits:

• Ensures consistent power availability for BBUs.
• Reduces maintenance and replacement costs due to long-lasting performance.
• Provides peace of mind for critical infrastructure where battery failure is not an option.

The P50S delivers reliable, durable, and predictable performance over the long term, even in demanding standby applications.

Safety Features

The INR-21700-P50S is built with several layers of protection to keep the battery safe and stable during use. These features help prevent overheating, damage, or dangerous failure modes, especially in backup and high-demand systems.

• Proprietary Low Flammability Technology: Utilizing proprietary low flammability technology to achieve exceptional thermal stability, the P50S often results in controlled venting without flame propagation. This minimizes the risk of catastrophic failure and is crucial for critical infrastructure.
• CID (Current Interrupt Device): Prevents overcurrent events that could damage the cell.
• PTC (Positive Temperature Coefficient): Limits current flow if the cell overheats, protecting against thermal issues.
• Reinforced Separator: Reduces risk of internal short circuits and enhances structural stability.
• High-temperature tolerance: Can operate safely under elevated temperatures without compromising performance.
• Thermal stability design: Helps prevent thermal runaway during long-term standby or high-load usage.

These features make the cell a great choice for backup and emergency power systems because it can deliver power immediately when it’s needed most.

Advantages Over Conventional Backup Cells

• Higher Energy Density: Stores more energy per unit weight and volume than traditional 18650, LiFePO₄, or lead-acid cells, enabling more compact and lighter battery packs.
• Improved Safety-to-Energy Ratio: Built-in protections and stable chemistry reduce risks compared to older technologies.
• Longer Lifespan: Durable construction and resistance to capacity fade allow more cycles, reducing maintenance and replacement costs.
• Better Performance Consistency: Maintains stable voltage and power output during standby, emergency activation, and high-current events.
• Space and Weight Efficiency: Ideal for portable or wall-mounted backup units where size and mass are critical.

Ideal Applications

The INR-21700-P50S is designed to secure reliable energy for critical infrastructure and demanding power systems. As an ideal solution for Battery Backup Units, the P50S can provide instant high power when a power outage occurs. Its compact size and high energy density make it exceptionally well-suited for use in tight spaces like server racks. This foundational capability positions the P50S as the essential core component across several high-growth, high-demand sectors:

1. Data Center BBUs: The P50S is ideal for providing robust, critical power supply to modern hyper-scale data centers, supporting high-demand hardware.
2. AI and Computing: The cell is designed to ensure reliable, high-power delivery for demanding AI computing applications, including the critical adoption of NVIDIA GB300 GPU-equipped servers.
3. HVDC (High Voltage Direct Current) Infrastructure: The P50S supports the new HVDC power systems, ensuring the greater efficiency and stability required by this advanced data center infrastructure.

Applications requiring high energy density, reliable power, compact design, and long-term durability make them ideal for different high-demand electronics.