Brand-new A-grade 340Ah LiFePO4 3.2V cells are high-performance lithium iron phosphate batteries designed for custom solar or EV battery packs. They offer 3,000+ cycles, thermal stability, and scalable voltage configurations (12V, 24V, 48V) via series/parallel wiring. Ideal for DIY enthusiasts, these cells provide 80% capacity retention after 2,000 cycles and operate between -20°C to 60°C.
DEESPAEK Lithium Iron Phosphate (LiFePO4) Battery
What Are the Key Specifications of 340Ah LiFePO4 Cells?
These A-grade cells deliver 340Ah capacity at 3.2V nominal voltage with ±0.05V cell matching. Key specs include 1C continuous discharge (340A), 0.5C recommended charge rate (170A), and ≤25mΩ internal resistance. With a 95% round-trip efficiency, they support 4,000+ partial cycles (80% DoD) and feature built-in CID safety mechanisms against overpressure scenarios.
The cells utilize prismatic aluminum casing with dual-terminal M8 threaded connections rated for 500Nm torque. Electrode thickness of 135μm enables low internal resistance while maintaining structural stability. Thermal management is enhanced through 6063 aluminum alloy cases with 8W/(m·K) thermal conductivity. Self-discharge rates remain below 3% per month at 25°C storage conditions.
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| Parameter | Value |
|---|---|
| Energy Density | 130Wh/kg |
| Peak Discharge | 2C (680A) |
| Cycle Life (100% DoD) | 2,500 cycles |
Which Tools Are Needed for DIY Battery Assembly?
Essential tools include: 1) Laser-welded nickel busbars (0.2mm x 25mm), 2) Programmable cell balancer (150mA balance current), 3) Hydraulic crimper for 4/0 AWG cables, 4) Insulation resistance tester (500V DC), 5) Torque wrench (2-4Nm for terminal bolts). Safety gear: Class D fire extinguisher, face shield, and HV-rated gloves for 48V configurations.
What Is a 7.4V LiPo Battery and How Does It Work
Specialized equipment should include a cell fixture jig maintaining 0.5mm alignment tolerance during assembly. For large packs, consider a vacuum lifter capable of handling 18kg cells without deformation. Terminal preparation requires anti-oxidation coating (zinc stearate-based) applied before busbar installation. Insulation testing should verify ≥100MΩ resistance between cell casings and busbars at 500VDC.
What Are the Critical Safety Protocols for DIY Builds?
1) Implement cell-level fusing (150A MIDI fuses). 2) Maintain 2mm minimum inter-cell spacing for thermal expansion. 3) Use compression fixtures (12kPa pressure). 4) Install redundant BMS with separate voltage/current/temperature monitoring. 5) Ground fault detection (30mA sensitivity). 6) Pressure relief vents in enclosure (0.5psi burst discs). 7) Hydrogen gas sensors for vented installations.
Always perform a staged activation process: first verify open-circuit voltage matches theoretical series/parallel calculations (±0.5V tolerance). Initial charging should use current-limited power supplies at 0.1C rate while monitoring cell balance. Implement a 72-hour observation period post-assembly with thermal imaging checks during first full discharge cycle. For mobile installations, include vibration dampers rated for 5G shock absorption.
“These 340Ah cells represent a paradigm shift in DIY energy storage. Their 1.09mV/°C voltage temperature coefficient allows more accurate SOC estimation compared to traditional 3mV/°C LiFePO4 cells. However, builders must account for the 18kg per cell weight – proper structural support is critical in mobile applications.”
– Senior Battery Engineer, Renewable Energy Systems Inc.
- Can I mix old and new cells in a battery pack?
- No. Maximum 5% capacity variance (17Ah) and 10mV voltage difference allowed between cells. Mixing aged cells degrades performance by 22-38% based on cycle count mismatches.
- What’s the minimum wire gauge for 48V systems?
- Use 2/0 AWG copper for ≤200A continuous loads. Increase to 4/0 AWG for 300A+ draws. Maintain 2% maximum voltage drop at full load.
- How to dispose of damaged LiFePO4 cells?
- Fully discharge to 2.0V/cell, submerge in salt water for 72 hours, then recycle through certified e-waste facilities. Never incinerate – thermal decomposition occurs at 800°C+.
The 340Ah LiFePO4 cells enable professional-grade DIY battery systems with military-grade safety margins. By adhering to the outlined configuration protocols and maintenance schedules, users can achieve 15+ year service life even in harsh environments. Their compatibility with modular BMS architectures makes them future-proof for evolving solar/EV technologies.