The following is PBZone power bank Evaluation specifications focuses on the detection of the test project:
- ? The actual capacity batteries
Since the attenuation characteristics of lithium batteries has allowed to capacity with the use (or place) to increase the time gradually reduced, and due to the chemical characteristics of lithium batteries, allowed values are nominal and actual capacity value appears on the product packaging or cases or less, but we are talking about power bank capacity vacuity is specific to the actual capacity lithium battery inside the packaging to be less than the marked capacity.
While in use national standard 0.2C discharge test, the test was measured capacity mobile power pack internal lithium battery is greater than the nominal value, be considered a qualified product. However, because of their errors and their impact on the lithium battery testing equipment, we require mobile power pack batteries inside the tolerance value should be-50mAh. For example, a nominal capacity of 2200mAh power bank, after the actual test, in fact, the measured capacity batteries 2160mAh, due to this situation within the allowable error range, and did not appear xubiao situation.
- ? Discharge curve test
Discharge curve test mainly the discharge curve, by looking at the discharge voltage curve to determine its output is stable enough, the actual output voltage is sufficient. Original USB charging adapter to the phone discharge curve as a reference, the more stable discharge curve, the better the output voltage of the more abundant. In addition, some fluctuations and erratic fluctuations in the power bank curve is also substandard products.
- ? Output Voltage Range
The actual output voltage is present for each output interface most mobile power pack when using the actual output voltage. Since the connection wire, plug wire resistance will cause the actual output voltage power bank declined, so in our tests, that under no circumstances (including no load), the ideal output power bank USB output port voltage range should be between 5V (± 0.5V), to be able to provide sufficient power to support the load equipment. But in everyday use, due to the interface and wire and other factors, the actual output power bank will be affected to some degree, so PBzone evaluation specification qualified power bank output voltage range of 4.1V-5.3V.
- ? Conversion efficiency
conversion efficiency of power bank is the ability to convert one product is good or bad judgment more important standards, high conversion efficiency power bank can provide longer battery life for users. Calculated as (actual discharge capacity × average discharge voltage) / (nominal capacity batteries × cell voltage) = conversion efficiency. For example a nominal capacity of 2000mAh batteries power bank, in the first case and obtain the actual discharge capacity 1000mAh 5.1V average discharge voltages of the two values, and is a single block of batteries, the method of calculating the conversion efficiency is:
(1000mAh × 5100mV) / (2000mAh × 3700mV) = 0.6891 = 68.91%
- ? Available capacity than
With conversion efficiency, as also one of the available capacity than standard power bank conversion capability to determine, in order to allow more consumers to quickly determine a power bank, we use the concept of available capacity than to note that, available capacity than the need to combine the output voltage conversion efficiency and performance of a number of tests to determine integrated. Because the lower the output voltage of power bank, the last calculated ratio of the higher available capacity.
- ? Consumable test
From the power called from the loss in the power bank refers to a non-use state of the power consumption of its own, since the loss of electric power bank by the main core and the protective circuit board to determine the main circuit board, the majority of quiescent current consumption power bank very small. Since the purpose of the set target power is to prevent the occurrence of discharge of the batteries stored in the power bank over the process, because the lithium battery over-discharge capacity and service life will be affected, so that power from the power bank for the test is very important, after all, for some consumers, under its own power bank battery is low, the situation appears months or even long-term placement of six months or so is quite likely to arise.
Due to a security (A) = 1000(mAh) 1 mA = 1000 microamps (μA), and power bank from internal current consumption will be less than 0.5 mA, which is 500 microamps, so we require, a consumable power bank when the value is less than or equal to 150 microamps, are considered qualified.
- ? Batteries discharge protection
Due to over-discharge of lithium batteries (most voltage drops below 3.0V) battery will cause some damage to life, so for power bank for when the cell voltage drops to what extent, the internal limit circuit turns off the (Shutdown) is more important. Low voltage lithium batteries will cause damage and lead to excessive voltage settings are retained too much battery capacity, so that users can not make full use of its capacity.
Therefore the power bank, how to obtain a good balance between reliability and performance are important. On the whole, power bank shutdown voltage set between 3.2V-3.4V, is more reasonable, both to ensure that lithium batteries even leave enough headroom and storage time in the off state, and will not appear over discharge, but also to most of the capacity of the lithium battery output to the user device needs to be charged.
- ? Discharge heat test
For detecting powerbank reliability. Environment due to the use and storage at high temperatures, causing the life and performance of lithium batteries be some impact, and because users often talk about portable power bank in the middle of poor package thermal environment environment for mobile phones and other devices for charging. Therefore, the detection power bank at the highest point of the shell temperature discharge state, can reflect the product in the electronic component materials, conversion efficiency and thermal design, and many other disadvantages.
In this hengping all 30 tested product to, in the nominal discharge condition, the maximum case temperature of the product was 74 ° C, the surface temperature of the internal circuit boards and electronic devices even higher, a long time is likely to cause damage to the lithium battery life. Therefore, we believe that mobile power pack at the highest point of the shell nominal discharge status after the next hour the temperature should not exceed 60 ° C. unos power bank
ZOLpower bank channel view:
In the eyes of most people, power bank is nothing more than a large-capacity backup battery so simple, but for the media, power bank far looks so simple. Compared to other products for, power bank has to do with the easy, good features, but it is difficult, after all, no parameters will affect the performance of the overall defect comprehensive ability. Only reliable quality, excellent performance and long life power bank has to be able to offer consumers a better user experience. As the domestic power bank industry is still a lack of standards and norms, so it needs to consumers, manufacturers and the media as we work together to be able to make this a more stable and healthy development of the industry continues.
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