Cut-Off Voltage for Lithium Batteries
The cut-off voltage for a battery refers to the lowest voltage level the battery can safely reach before it should be recharged to prevent damage. This cut-off point is crucial for protecting the battery from deep discharges, which can reduce its lifespan or even cause permanent damage.
The cut-off voltage varies depending on the battery chemistry:
1. Lithium-Ion (LiFePO4) Batteries:
For 51.2V lithium iron phosphate (LiFePO4) batteries, like those from Olelon Energy, the typical cut-off voltage is around 43.2V. LiFePO4 batteries are known for their ability to maintain a steady voltage throughout the discharge cycle. They are equipped with a Battery Management System (BMS) that automatically halts the battery’s discharge before it reaches a level that could cause harm, ensuring optimal battery health and performance.
- Typical cut-off voltage: 43.2V
- Nominal voltage: 51.2V
- Fully charged voltage: 58.4V – 58.8V
48V LiFePO4 Battery Voltage- Soc Chart
SoC% | Volt per Cell | 48V (15s) | 51.2V (16s) |
---|---|---|---|
100.00% | 3.65 | 54.75 | 58.4 |
99.50% | 3.45 | 51.75 | 55.2 |
99.00% | 3.38 | 50.7 | 54.08 |
90.00% | 3.35 | 50.25 | 53.6 |
80.00% | 3.33 | 49.95 | 53.28 |
70.00% | 3.3 | 49.5 | 52.8 |
60.00% | 3.28 | 49.2 | 52.48 |
50.00% | 3.26 | 48.9 | 52.16 |
40.00% | 3.25 | 48.75 | 52 |
30.00% | 3.23 | 48.45 | 51.68 |
20.00% | 3.2 | 48 | 51.2 |
15.00% | 3.05 | 45.75 | 48.8 |
9.50% | 3 | 45 | 48 |
5.00% | 2.8 | 42 | 44.8 |
0.50% | 2.54 | 38.1 | 40.64 |
0.00% | 2.5 | 37.5 | 40 |
2. Lead-Acid Batteries:
In a 48V lead-acid battery system, the cut-off voltage is typically higher, around 42V to 44V. Lead-acid batteries are more vulnerable to damage from deep discharges, which can lead to sulfation—a process where lead sulfate crystals form on the battery plates, reducing efficiency and shortening the battery’s lifespan.
- Typical cut-off voltage: 42V – 44V
- Nominal voltage: 48V
- Fully charged voltage: 54V – 55V
Importance of Cut-Off Voltage:
The cut-off voltage is essential for protecting your battery from over-discharge, which can lead to significant performance degradation. Here’s why it’s important:
- Lithium-Ion Batteries: For lithium batteries, over-discharge can cause irreversible damage, reducing capacity and overall lifespan. Olelon Energy’s BMS helps prevent this by cutting off discharge when the voltage reaches 43.2V.
- Lead-Acid Batteries: Over-discharging lead-acid batteries can cause sulfation, where lead sulfate crystals accumulate on the plates, leading to reduced capacity, decreased efficiency, and ultimately a shorter lifespan.
How Olelon Energy Manages Cut-Off Voltage:
Olelon Energy lithium batteries feature an advanced Battery Management System (BMS) that ensures the battery operates within safe voltage ranges. For our 51.2V lithium batteries, the BMS cuts off the discharge at 43.2V, preventing damage from deep discharges and preserving battery performance over time. This protection feature is particularly important for maximizing the lifespan and maintaining consistent power delivery to your golf cart or other electric vehicles.
In addition to the discharge cut-off, Olelon Energy’s charging system includes a BMS high voltage cutoff to protect the battery from overcharging. The high voltage cutoff occurs at 58.4V. This is managed by both the battery’s BMS and the charger, ensuring that the battery is never charged beyond its safe capacity, thus preventing potential damage from over-voltage during the charging cycle.
If you’re looking for a reliable 51.2V lithium battery solution with built-in protections, Olelon Energy offers high-performance batteries designed to ensure safety, longevity, and consistent performance. Contact us today to learn more about our lithium battery solutions for golf carts and other electric vehicles!