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Rechargeable Battery Capacity Testing and it’s Methods

Abstract—The new gadgets like Laptops, tablets, mobiles, smart pads and many more are the example of such fast pacing development that are done in technological areas. To continue with these gadgets, energy is the most influential source that is require. We use our mobile phones and we recharge them once it is out of juice. All the rechargeable sources run on battery, the electrical source of energy. The capacity of the batteries is its major concern. Till gadgets it is ok but the low capacity batteries cannot suffice the needs and requirements of industries.

This project paper focuses majorly over the establishment of various methods that are the used in order to check the capacity of the battery. It is done so to understand the shortcomings in the capacity and do research and development to enhance it.
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Introduction

The race of technological discoveries is taking the world by surprise with every new concept being converted to reality every day [1]. A capacity cycle of the battery is the iteration of functions it can carry. The self-discharge or the functional discharge of the battery is inevitable in nature after a few cycles. The user has an utter need to determine whether the battery capacity has come to extreme low, that it needs to be recharged. In smart phones and other gadgets, these details are displayed on the screen but there are many industrial purposes that do not do that and the power goes off when the charge goes off.

a. The complete charge of the battery.
b. The remaining charge of the battery.
c. The extent of manufacturer’s specification the battery is meeting.
d. Reliability of the remaining charge.
e. Effect of electrical noise or interference onto it.

Literature Survey

With many recent surveys it has been established that knowing the capacity of a battery is not a new thing and many conventional methods have been adopted widely to do it. For example, the multi meter utilization which gives a direct reading of the remaining charge in the battery. The only demerit it has is that it is unable to display the capacity of the battery

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Apart from it, the manual display is also one method where the battery capacity is manually calculated. The charging the battery and discharging it again is in between followed by taking the notes of the charges. The capacity of the battery can be arrived with certain conclusions.

The battery capacity testers are the set of equipment that come with charging modules. The capacity of the battery in mAh can be determined with this set of battery capacity equipment.

Rapid test is yet another conventional test that uses the pulses to notice the flow of ion in the batteries like Li-ion. The battery is also scanned by multiple frequencies.

Various Testing Methods for Finding the Capacity of the Rechargeable Battery

There are so many of them but only a few influential ones are considered to be compared in this paper due to their huge impact over the determination of capacity.

1. Abuse Testing: the major reason, this testing is performed is to determine the extent of harmfulness a battery pursues for its user. It also determines the chance and condition in which it can get discharge or provide any sort of damage to the user. The figure shown below is the representation of battery capacity and other terminologies related to it when they are plotted on the axes of percentage of capacity discharge and cell voltage.

2. Cycle Testing: one of the most important ones from the qualification tests, this method defines the amount of charge-discharge cycles the device has gone through. The bench mark is 80% and it is ensured that the charge-discharge cycle performs before the capacity goes down beyond the bench mark. The major concern to establish this battery testing method is to determine the linearity of battery performance with end product reliability. Many companies adopt it to set their guarantee periods.

3. Load Testing: This method is determined to find the truth behind the specified power by the company. The expected conditions are created for which the battery has been manufactured. Either the constant load or pulsed loads are simultaneously applied to the battery. In the case of low power testing, resistive loads are utilized for making the load testing successful. There can be two consequences of the test.

a. The battery discharges intermittently which is a sign of good capacity.
b. The battery discharges continuously which is the sign of bad battery capacity.

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