How Internal Resistance Affects Industrial Battery PerformanceApril 21, 2022 12:00 am Leave your thoughts
The capacity of a battery doesn’t tell its full story because a perfect battery must deliver all the stored energy effectively. There is no perfect battery in the real world because no battery can give the entirety of its stored battery due to factors like internal resistance. However, batteries with lower internal resistance typically perform better than those with higher resistance.
So What Is Internal Resistance in Batteries?
In simple terms, internal resistance can be described as the "gatekeeper" of batteries. The internal resistance will hinder voltage delivery and determine the battery’s runtime. The internal resistance of a battery is calculated based on various parameters like the size of the battery, state of charge, age of the cells, temperature, internal chemistry, and current discharge and is measured in milliohms. Understanding the internal resistance of a battery will enable you to know its state of health and power capabilities and estimate its performance.
Internal Resistance and Power Tools
As already indicated, the lower the battery’s internal resistance, the more capable it is to deliver more power. This is especially useful when the battery supplies its power to heavy loads like electric power trains and power tools. On the other hand, batteries with high resistance typically heat up, resulting in the voltage supplied dropping under load leading to a premature shutdown.
How Is Internal Resistance Used in Forklift Batteries?
The forklift is one of the standard power tools in industrial applications that dramatically benefit from batteries with low internal resistance. Traditionally, forklifts are used to lift and transport heavy loads over short distances like in warehouses. This means they usually need significant amounts of power to raise the loads consistently. Thus, most forklifts are fitted with batteries with exceptionally low internal resistance and the ability to sustain high voltage demands over long periods. This allows them to lift heavy loads and carry them over the short distances.
Lithium-ion batteries are commonly used in forklifts due to their very low internal resistance, which remains relatively stable from full charge to full discharge. This type of battery can continuously provide a high current and offers the forklift the grunt to lift the load and carry it to the required position. Lithium-ion batteries consistently provide high current power until the charge is depleted. Thus, they allow for the continuous running of forklifts in industrial applications.
On the other hand, lead-acid batteries have a relatively low internal resistance, but they cannot provide the high current required by forklifts for extended periods. Their voltage drops significantly after a couple of seconds, and they need to rest before they can give another burst.
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