Resistance test lithium battery

What is the internal resistance of a lithium ion battery?

The typical internal resistance of a lithium-ion battery varies depending on its capacity and design. Generally, it ranges from a few milliohms to tens of milliohms. For example, a 2000 mAh lithium-ion battery may have an internal resistance of around 50-100 mΩ. Can high internal resistance cause a battery to fail?

Do lithium-ion batteries have a resistance test?

With the large number of lithium-ion batteries in use and the applications growing, a functional rapid-testing method is becoming a necessity. Several attempts have been tried, including measuring internal resistance, and the results have been mixed.

How to measure battery internal resistance?

The pulse load test is another method for measuring battery internal resistance. It involves applying a short-duration, high-current pulse to the battery and measuring the voltage response. The internal resistance can be calculated from the voltage drop during the pulse. 1.

What should a battery's internal resistance be?

Ideally, a battery's internal resistance should be zero, allowing for maximum current flow without any energy loss. In reality, however, as illustrated in Fig.1, internal resistance is always present. Let's consider an example to illustrate this. The battery voltage is determined by the internal resistance and the output current.

What happens if a battery has a high internal resistance?

If one or more cells have high internal resistance or have degraded, they will become a bottleneck and limit the battery pack’s capacity. To improve the quality of the battery pack, it is important to select cells that all have an equivalent internal resistance. The second reason for measuring internal resistance is for battery maintenance.

Why is the internal resistance of a battery important?

The internal resistance of a battery is an important parameter for quality inspection during production and maintenance process. Get the best performance out of your battery by measuring it properly. The internal resistance of a battery can be used for two different purposes.