Lithium Iron Phosphate (LiFePO4) Battery Usage and Maintenance Guide
- 02/20/2025
To ensure the safety and longevity of your LiFePO4 battery, please follow the guidelines below for inspection, usage, and maintenance.
Recommended URL: https://suns-power.com/products-joyvoit/Lithium Ion Battery
JOYVOIT LiFePO4 Batteries
1.Battery Inspection Upon Receipt
- (1)Charge/Discharge Function Test
- *Connect the battery and perform a charge/discharge test to confirm it is functioning correctly.
- *For batteries with communication capabilities, use specialized software to check BMS communication status and data.
- (2)Battery Voltage Check
- *Use a multimeter to measure the initial battery voltage to ensure it hasn’t been over-discharged.
- *If the voltage is low, charge the battery immediately to avoid long-term low-voltage damage.
- (3)External Inspection
- *Check the battery casing for any deformation, damage, or leakage.
- *Ensure terminal connections are secure to prevent poor contact during operation.
- (4)Initial Charging Recommendation
- *Batteries may self-discharge during transportation and storage.
- *Recommendation: Fully charge the battery upon receipt before use.
2.Troubleshooting and Diagnostic Steps
- (1)Battery Not Charging/Discharging
- *Charger Check: Confirm that the charger is working properly. Some smart chargers only start charging when a certain voltage is detected.
- *Connection Check: Ensure battery terminals and cables are securely connected and free from oxidation.
- Voltage Check:
- *Total Voltage = 0V: Potential welding disconnection; laser welding may be required.
- *Cell Voltage < 2V: Over-discharge; balance charging is recommended.
- *Cell Voltage Difference > 0.5V: Manual or active balancing is needed.
- (2)Internal Battery Check
- *Always disconnect the battery and wear protective equipment before disassembly.
- *Inspect battery connections and wiring for damage or poor soldering.
- *Use a multimeter to measure cell voltages and identify abnormalities.
- (3)BMS (Battery Management System) Check
- *If the battery voltage is normal but it won’t operate, the BMS may be faulty and require replacement.
- *Common Causes of BMS Failure:
- a.External short circuits or overloads
- b.Prolonged exposure to high temperatures
Check the Car Lithium ion battery
3.Battery Balancing and Maintenance
- (1)Balancing Overview
- *The built-in BMS uses passive balancing.
- *For more efficient balancing, consider adding an active balancing board or Bluetooth-enabled balancing device.
- (2)Balancing Maintenance Tips
- *Regularly check cell voltage consistency; if differences exceed 0.5V, perform balancing.
- *For long-term storage, perform a full charge/discharge cycle every three months to maintain battery activity.
4.Battery Disassembly and Repair Precautions
- (1) Always disconnect the power before disassembly and wear protective gloves and goggles.
- (2) Use a laser welding machine for aluminum tabs; conventional spot welding won’t work.
- (3) For wiring repairs, use a soldering iron while avoiding prolonged high-temperature exposure.
5.Recommended Charging/Discharging Parameters
| Parameter |
Recommended Value |
|---|---|
| Low Voltage Cutoff |
3.0V/cell (or 2.8V) |
| Low Voltage Recovery |
3.2V/cell (or 3.0V) |
| Charge Cutoff Voltage |
3.65V/cell |
| Operating Temperature |
- 10°C to 55°C |
Parameter Adjustment Tips
- * Set the solar controller’s charging voltage slightly below the BMS cutoff to avoid frequent disconnections.
- * In mountainous areas or low current conditions, slightly increase the low-voltage cutoff to prevent excessive SOC depletion.
Lithium ion batteries Maintenance
6.Common Issues and Solutions
- (1)Inaccurate SOC (State of Charge)
- *Potential Causes: Incorrect capacity settings or battery aging.
- *Recommendations:
- a.Calibrate the BMS with the correct battery capacity
- b.Base charging/discharging decisions on voltage rather than SOC, as SOC readings can be influenced by temperature, aging, and usage conditions.
- (2)Overvoltage Without Charging Cutoff
- *Check BMS settings to ensure the overvoltage protection threshold is accurate.
- *If the BMS is set correctly, verify that the solar controller’s charging voltage isn’t exceeding the limit.
- (3)Cell Imbalance
- *Inspect connection wires and terminals.
- *Use an active balancer or perform manual full charge/discharge cycles. When Voltage difference between cells >0.5V.
Battery Cell Imbalance
7. Safety Precautions
- (1)Transportation and Storage
- *Store the battery at 50%-60% SOC to prevent over-discharge or overcharge.
- *Keep the storage area dry, ventilated, and away from flammable materials.
- *Storage Recommendation: Charge the battery every three months to counteract self-discharge.
- (2)Operating Environment
- *Avoid exposing the battery to extreme heat or cold for extended periods.
- *Refrain from deep discharging the battery frequently to prolong its lifespan.
- (3)Maintenance Checks
- *Periodically inspect terminals and cable connections for looseness or corrosion.
- *Stop using the battery immediately if swelling, leakage, or abnormal heat is detected.
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