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    ELECJET Tech Insider

    JetSafe, The Key to the Safety of Fast Charging Power Banks

    JetSafe, The Key to the Safety of Fast Charging Power Banks

     

    Why do we need a fast charging power bank?

    Smartphone is one of the most important devices in our life. With more time we use our smartphones, the power consumption has increased considerably as well. A portable battery pack, a.k.a power bank, allows us to charge our phones everywhere. However, once the power bank run out of power, we usually have to take hours to charge it with our mobile charger. JetSafe(TM), the exclusive technology invented by ELECJET, is able to let power banks charge faster in a safe way.

     

     

    How batteries work while charging?

    To understand the benefits of JetSafe(TM), we need to know how batteries work while charging. The battery voltage of a power bank is usually ranged between 3V (empty) to 4.2V (fully charged). If we use a traditional 5W mobile charger (5V/1A) to charge our power bank, some of the energy was lost in the conversion and were released as heat:

    5V input → passing through circuit → charging batteries at 3.7V + HEAT

    Based on the theory of physics:

    P (Power) = V (Voltage) * I (Current)

    We can either charge the power bank with higher voltage output to charge faster by using a 18W fast charger (9V/2A) or a 60W laptop charger (20V/3A). However, when we use higher voltage to charge our power bank, lots of the energy was lost in the conversion and released as heat.

    Nowadays circuits board inside the power bank requires much many sets of series connection to increase the battery power voltage, improve conversion efficiency, and trying to maintain circuit boards at lower temperature to prevent overheating problem.

    How bad does my power bank gets warm while charging?

    If the charging efficiency is about 85%, when we push charging at 30W ~ 60W, heat would be generated around 4.5W - 9W:

    30W * (1-0.85) = 4.5W

    60W * (1-0.85) = 9W

    Heat accumulation could lead to circuit board being overheated and continued to reduce charging efficiency, forming a negative feedback loop. In the end, we still can't save time effectively while charging the power bank.

    How can I charge my power bank effectively to save more time?

    Our exclusive technology, JetSafe(TM), can be achieved by either single unit or parallel connections to prevent circuit board being overheated and elevated charging efficiency up to 96% when charging at 60W.

    That means the heat will be decreased:

    30W * (1-0.96) = 1.2W

    60W * (1-0.96) = 2.4W

    Power banks with JetSafe(TM) technology now can be full charged with less time.

    How does JetSafe(TM) saves my time and money?

    In case you were wondering what’s the advantage achieving same charging result with single battery cell or parallel connection in contrast to serial connection.

    • Safety is the key

    If we were to charge a battery pack consisted of 3 modules of serial connection, there’s still bound to be a difference between each battery capacity, resistance and voltage.

    If batteries is being viewed as 3 water bottles, there will be difference between each individual volumes; if we were to filled them at same rate and and time, there will be at least 1 water bottle being unavoidably overfilled and ended up leaking. (Battery overcharged)

    Unless we were to insert a pressure balance regulator to balance out the voltage and current to maintain stabilized State or Charge (SOC). This can be seen often in laptop or other higher grade expensive electronics which also comes in more space, but none in power bank due to budget restriction & space limitation.

    Due to such limitation mentioned above, overcharging serial modules battery sometimes can be dangerous as batteries exploration could happened when it is being overheated and over expanded with excessive over-charging.

    However, if we were to choose a single uni battery with higher power capacity, such dangerous scenario can be prevented & avoided.

    • Discharge at high volume.

    As times goes by with continued usage, each of the 3 serial battery modules will have even greater difference with their power volume, resistance and voltages. Charging could automatically ceased when bottle A was being filled up, or stop discharging energy when bottle B reached critical volume.

    JetSafe technology guaranteed 20% more energy efficient comparing to traditional power bank made up with serial connection modules.

    • Prolong LifeSpan

    After several repeated discharging cycle, the lifespan of a 2 pack serial connection battery modules would ended up with only 10% of its original lifespan; whereas the lifespan of a 3 pack serial connection battery modules would ended up with 20% of its original lifespan.

    The rapidly shortening of the battery lifespan can be further divided into 2 reasons; 1. Serial connection unavoidably overcharged one or two batteries; 2. Internal resistance is greatly increased with serial battery modules but decreased with parallel battery modules. If a single battery has internal resistance of 10 milliohm  (mΩ), a serial connections of 3 battery modules would increased its resistance to 30 milliohm (mΩ), whereas 3 parallel battery modules would ended up with resistance of only 3 milliohm (mΩ).

    By minimizing internal resistance, JetSafe was able to greatly reduce the energy generated, released and wasted as heat, improving discharging efficiency with maximum continuous discharging current, at same time prolong the power bank lifespan.

     

    Editors’ Recommendations

    ELECJET APOLLO PROJECT : World's First Graphene Battery USB C PD Power Bank

    ELECJET APOLLO PROJECT : World's First Graphene Battery USB C PD Power Bank

    It has been a year since we rolled out Project Apollo, it marks our one year anniversary. We are so humble and thankful to everyone’s support, together we have accomplished the very first Graphene battery pack power bank in human history.

     

    History and originality of project Apollo

    Development of our project had not been a buttery smooth experience, but rather a rocky hilly tough hike. 80% of our staff at ELECJET  are engineers, previously worked and developed production innovation at Huawxx DJx, Ankxx,

    To be honest, we have already obtained the very first graphene composite electric core in 2013. We tried pitching our graphene electric solution to all the well known brands out there, but no one was interested in our graphene battery solution. Most of the well known brands out there, does not wish to contribute nor invest in time consuming cost burning innovation technology, but rather than purchase ODM from factory and promote it as their own brand.

    We are proud to say Team ELECJET has been working hard to innovate within battery power solution for 12 years. The time has called out for us to create and develop our own brand, Apollo. ELECJET, is a compound word from Electricity, ELEC and JET from jet engine style fast charging; the middle word C also represent USB type C and all our product are focus and specialised in USB type C power bank.

    Frequently Asked Questions:

    Why doesn’t my charger supports Apollo?

    First of all, please make sure your charger fully supports USB Power Delivery . (What is USB Power Delivery a.k.a. USB PD) ?

    Why does my equipment supports USB PD but not Apollo?

    USB C PD charging circuit can be differentiate into two components, first part is power components, and the second part is the USB PD chip. After further testing we have came out with 3 possibilities...

    1. The chip of your charger does not abide by USB PD, some of the third party manufacturing tend to use less popular circuit in order to cut cost.

    2. For example Apple uses Cypress semiconductor, even though all suppliers are bonded to an USB PD buy due to semiconductor has major advantage and often (always) included additional  subsidiary regulation and agreement for third party USB PD chargers to match their requirements which often leads to further incompatibility.

     

    3.There are also known issues regarding incompatibility occurred upgrading from USB PD2.0 to PD3.0.

    To provide our customer with maximum compatibility and improve our user experience, Apollo uses Cypress chip, the very same USB PD chips as Apple and their official suppliers. We are proud to say Apollo fully support Apple charger (30W - 87W)

    At the same time we have also gone further testing with popular known brands and we are happy to say we fully compatible with brands listed below;

    • Apple
    • Lenovo (V400 is known has a compatibility bug, but Apollo is fully compatible with V500)
    • Dell
    • HP
    • Switch
    • and our own ELECJET 60W adapter

     

    For the reasons listed above, we cannot guaranteed full compatibility all third parties charger.

    Apollo is fully compatible with all USB C PD output, should you have any concern please check with the table we created below with all known mobile device we know abide to USB C PD.

    Understand what is USB PD in 1 minute

    Understand what is USB PD in 1 minute

    In order to understand what is USB PD , let's learn some basic knowledge:

    Firstly, P(Power)=V (Voltage) * I (Current).

    Secondly,   Battery power voltage is usually between 3V (empty) to 4.2V (fully charged).

    According to the law of physics, to increase power you can either 

    1. Increase electricity current 

    2. Increase power voltage

    3. Dynamically promote either and both electricity current and power voltage

    If battery was a traditional waterwheel, the process of charging is using ongoing water current to propel waterwheel to power electricity; in this case power voltage is the height of water stream, and electrify current is the size of the water stream. 

     

    Proposal 1: increase electricity current 

    Both OPPO VOOC / OnePlus Dash / Huawei Super Charge Protocol all opt to increase their electricity current, this would also minimise the heat produced during production of power, the downside of this option is it require specialised cable and charger, it requires higher cost production hence decrease availability. 

     

    Proposal 2: increase powering voltage 

    Qualcomm QC 2.0 and some alternative regulations based on Qualcomm QC 2.0 has evolved itself into Huawei FCP and Samsung AFC. 

    Proposal 3:Dynamically alternate increase in both power voltage and electricity current 

    As we stated previously, battery power voltage is usually within 3V - 4.2 V, alternating dynamically increase in voltage and current charges battery at highest efficiency. For example, there’s nil to very little heat produce at start of battery charging, it increase power voltage, when battery started to released waste by product as heat energy, it automatically alternate to increase in electricity current to retain highest efficiency of battery charging.

    Both Qualcomm QC 3.0 / QC 4.0 has adapted alternate charging solution. Qualcomm as a mobile chip supplier has been limited itself to maximum of 27 watts due to current on market battery power; whereas laptop USB PD supports up to 100W as well as QC4.0. USB IF is a non profitable organisation, it does not holds any conflict of interest between all manufacturer, we see USB PD is a future trend for charging solution.