Author: Site Editor Publish Time: 2025-01-06 Origin: Site
Battery internal resistance is a critical indicator for evaluating the health and service life of batteries. Over time, internal resistance gradually increases, negatively impacting performance. This can result in slower discharge rates, higher energy loss, and elevated operating temperatures. Particularly, when internal resistance exceeds 25% of the normal value, battery capacity decreases significantly, compromising system stability. Therefore, real-time dynamic monitoring of battery internal resistance is essential.
1. Direct Current (DC) Discharge Method
This method involves discharging the battery with a high current and calculating the internal resistance based on the voltage drop. While it provides high measurement accuracy, it causes polarization reactions within the battery, accelerating aging. As a result, this method is primarily used in research and pilot production phases and is not suitable for long-term monitoring.
2. Alternating Current (AC) Impedance Method
By applying an alternating current of a specific frequency and leveraging Ohm's Law and capacitance principles, this method measures internal resistance. Unlike the DC discharge method, the AC impedance method avoids damaging battery life and offers results that are less frequency-dependent. Measurements taken at a frequency of 1kHz are typically the most stable. This method is widely used in industry and achieves high accuracy, with a margin of error between 1% and 2%.
DFUN has developed an innovative improvement on the traditional AC impedance method—the AC Low Current Discharge Method. By applying an alternating current of no more than 2A and precisely measuring voltage fluctuations, the internal resistance of the battery can be calculated accurately in a short duration (approximately one second).
Key Advantages:
High Accuracy: Measurement accuracy is close to 1%, with results nearly identical to those of third-party brands like Hioki and Fluke.
Internal Resistance | 2V Battery: 0.1 ~ 50 mΩ | Repeatability: ±(1.0% + 25 µΩ) | Resolution: 0.001 mΩ |
12V Battery: 0.1 ~ 100 mΩ |
No Impact on Battery Health: With low current and minimal discharge amplitude, this method does not harm the battery or accelerate aging.
Real-Time Monitoring: It enables real-time acquisition of battery status, effectively preventing performance degradation caused by increased internal resistance.
Versatile Application: This technology is not only applicable to lead-acid batteries but is also effective for monitoring internal resistance in various other battery types.
Ensure your batteries remain in optimal condition, enhancing the stability and reliability of your power systems.
