Discover the engineering behind lithium battery configurations and learn why core count matters for optimizing power delivery in electric vehicles and industrial applications.
Understanding Lithium Battery Cores
A 72V20A lithium battery pack's performance hinges on its internal structure. Unlike traditional lead-acid batteries, lithium-ion packs use multiple cells (cores) connected in series or parallel to achieve desired voltage and capacity. Let's break down the math:
Core Calculation Basics
- Voltage per cell: Standard lithium cells output 3.6V–3.7V.
- Series connection: To reach 72V, you'll need 72V ÷ 3.7V ≈ 20 cells in series.
- Capacity scaling: For 20Ah capacity, parallel connections may be required if individual cells have lower ratings.
Pro tip: High-performance applications like e-scooters often use 18650 or 21700 cells. A 72V20A pack with 21700 cells (5000mAh each) would require 4 parallel groups of 20 series cells – totaling 80 cores.
Factors Influencing Core Count
Why doesn't every 72V20A pack use the same configuration? Here's what engineers consider:
1. Application Requirements
| Application | Typical Core Count | Cell Type |
|---|---|---|
| Electric Bikes | 60-80 | 18650 |
| Solar Storage | 20-40 | Prismatic |
2. Energy Density vs. Cost
Higher core counts improve energy density but increase manufacturing complexity. For example:
- 80-core 21700 packs: 15% lighter than equivalent 18650 designs
- Prismatic cells: Fewer cores (as low as 20) but 20% cheaper for stationary storage
Real-World Example: EK SOLAR's 72V20A Design
EK SOLAR's battery engineers recently optimized a pack for electric delivery trikes. The solution used:
- 68 cores (17S4P configuration)
- Custom NMC cells with 5.2Ah capacity
- Cycle life increased to 2,000+ charges
Did you know? Adding a Battery Management System (BMS) can extend pack lifespan by 30-50%, regardless of core count.
FAQ: Lithium Battery Core Questions
Q: Can I modify core count in an existing pack?
A: Not recommended – altering cell arrangements without professional guidance risks thermal runaway.
Q: How does temperature affect core performance?
A> Lithium cells lose ~15% efficiency at -10°C. Multi-core designs with thermal management maintain stable output.
Need a custom 72V lithium solution? Contact EK SOLAR's energy specialists:
- WhatsApp: +86 138 1658 3346
- Email: [email protected]
From electric mobility to industrial backup systems, understanding core configurations ensures you get the right balance of power, weight, and longevity. Whether you're designing an EV prototype or upgrading solar storage, the magic lies in the cells' arrangement.
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