A brief discussion on the impact of Peukert’s law on batteries

In the process of using of batteries, have you found that when some batteries are used under high load, the battery life is much reduced than the theoretical value? If you happen to be using a lead-acid battery, then part of the reason for this is the so-called Proctor’s law. Next, let’s learn what Puckett’s law is and what its impact is on batteries?

the impact of Peukert's law on batteries

What is Puckett’s law?

Peukert’s law was proposed by German scientist Wilhelm Peukert in 1897. It states that the capacity of rechargeable lead-acid batteries changes at different discharge rates. As the discharge rate increases, the available capacity of the battery will decrease. According to the actual situation of the battery, it can be expressed by the following formula: t = H(C/IH) k , where H is the rated discharge time (h) , C is the rated capacity at the discharge rate (Ah), and I is the actual discharge current (A), k is Peukert’s constant value and t is the actual time (h) of battery discharge.

The constant value k changes with the battery life and usually increases as the battery life increases. For lead-acid batteries, the constant value k is usually between 1.1 and 1.3.

Next, let‘s calculate the actual discharge time of the lead-acid battery through the above formula. there is a lead- acid battery with a rated current of 100Ah and a discharge of 20h, the constant value k is 1.2, and the battery is discharged at a current of 10A. Then it How long does it take to fully discharge? From the above formula, it can be calculated that it will take approximately 8.7 hours, which is less than the theoretical 10 hours.

The influence of Puckett’s law on lead-acid batteries

It can be seen from the above that under high load conditions, the higher the load, the less available energy the lead-acid battery can provide. This is why lead-acid batteries last less than theoretical time under load. This is mainly due to the chemical properties of lead-acid batteries.

The influence of Puckett’s law on lithium iron phosphate batteries

Compared with lead-acid batteries, lithium iron phosphate batteries are hardly affected by Puckett’s law. This is mainly due to the difference in the chemical properties of the two batteries. Therefore, lithium iron phosphate batteries have also become an effective alternative to previous traditional lead-acid batteries. Because lithium iron phosphate batteries are only slightly affected by Puckett’s law, they can release all of their stored energy and maximize battery performance.

Due to the high load limitations of lead-acid batteries, Our POWER LONG BATTERY(PLB) has specially developed a high-rate lithium iron phosphate battery that supports continuous 30C discharge, instantaneous 50C discharge , and can be cycled more than 2,000 times at 100 %DOD.It possesses high safety characteristics and exhibits excellent consistency.It’s widely used in motor starter, uninterruptible power supplies in data centers, etc. For more details, please view the website page of IFR26650-2500mAh lifepo4 battery!

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