Abstract:
A portable external power-supplying device is disclosed. The portable external power-supplying device implements a unique mechanism to detachably assemble battery units whose number can be adjusted according to user needs, which means the overall aggregate capacity of the portable external power-supplying device is adjustable. The portable external power-supplying device is adaptive to connect and charge a portable electronic device

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Technical Field 
         [0002]    The present invention relates to external power supply for consumer electronics, and more particularly, to a power-supplying device adaptive to connect a portable electronic device and act as a backup power source that provides a variable power capacity. 
         [0003]    2. Description of Related Art 
         [0004]    Currently, a rechargeable battery is a common power source for various portable consumer electronics, such as mobile phones, laptops, digital cameras, music players, etc. 
         [0005]    For charging such a rechargeable battery, a specific charger is required to adjust the AC power from the power grid into a certain potential. Where the power grid is inaccessible, charging is impossible and the portable device using the battery cannot serve when the battery is exhausted. 
         [0006]    To avoid this plight, a portable power supply, or a “power pack”, has been developed. By using the same, users can charge their consumer electronics everywhere despite the accessibility of the power grid. 
         [0007]    The existing portable power supply is mainly composed of a rechargeable battery and a control circuit that are packed in an enclosure. The commercialized products are provided with different battery capacities. While a portable power supply having a small capacity is usually compact and light, it cannot serve long. On the other hand, a portable power supply having a small capacity serves long yet is bulky and less portable. In addition, the existing rechargeable battery has its life subject to its age and/or frequency of use and once the battery become poor in performance or broken, the whole power supply is unusable. 
       SUMMARY OF THE INVENTION 
       [0008]    In view of the shortcomings of the prior-art device as stated above, the present invention provides a portable external power-supplying device with a variable power capacity. The power-supplying device has detachably combined battery units whose number can be adjusted according to user needs, which means the overall volume and weight of the power-supplying device is manageable. The individual battery units are replaceable, so the performance of the power-supplying device can be easily maintained. This helps to preserve resources. 
         [0009]    To this end, according to the present invention, a portable external power-supplying device comprises a power control module and one or more battery units whose aggregate capacity is variable. The power control module includes a circuit board, an indicator light set, a first port, a power inlet, a power outlet and others. The individual battery unit includes a controller, a cell, a second port and a third port. 
         [0010]    When communicated with the battery units, the control module charges the battery units through the power inlet for later use. In use, the control module supplies power to a portable electronic device through the power outlet. 
         [0011]    The control module can charge one or more battery units. These charged battery units can be easily assembled or separated so that one or more battery units can be used to charge according to practical needs. As each battery is subject to its cycle life, once any of the individual battery units is out of use, the power-supplying device can be replenished by replacing the broken battery unit with a new one. As compared with retiring the whole prior-art device, this significantly reduces costs and is friendlier to the environment. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    The invention as well as a preferred mode of use, further objectives and advantages thereof will be best understood by reference to the following detailed description of illustrative embodiments when read in conjunction with the accompanying drawings, wherein: 
           [0013]      FIG. 1  is a top view of an individual battery unit according to the present invention; 
           [0014]      FIG. 2  is a schematic drawing illustrating a power control module according to the present invention; 
           [0015]      FIG. 3  is a perspective view of the assembled power control module and individual battery unit according to the present invention; 
           [0016]      FIG. 4  is a lateral view of the assembly of  FIG. 3 ; 
           [0017]      FIG. 5  shows the power control module and plural said individual battery units to be assembled; 
           [0018]      FIG. 6  is a perspective view of the assembled power control module and individual battery units according to the present invention; 
           [0019]      FIG. 7  is another perspective view of the assembly of  FIG. 6 ; 
           [0020]      FIG. 8  is a schematic drawing showing the power control module to be stacked with the individual battery; 
           [0021]      FIG. 9  is another schematic drawing showing the power control module to be stacked with the individual battery unit; and 
           [0022]      FIG. 10  is a schematic drawing showing the power control module to be stacked with plural said individual battery unit. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0023]    Referring to  FIG. 1  and  FIG. 2 , in the present invention, a portable external power-supplying device primarily comprises a power control module  1  and one or more individual battery units  2 ,  3 ,  4 ,  5 . 
         [0024]    As shown in  FIG. 2 , the power control module  1  has an enclosure  11  containing therein a circuit board  12 . On the circuit board  12 , there are a charge controller loop  121 , a buck-boost converter loop  122 , a power manager loop  123 , a button switch  124 , an indicator light set  125 , a first port  126 , a power inlet  127  and a power outlet  128 . The enclosure  11  has its back provided with a positioning hole  13  and a fixing hole  14 . 
         [0025]    The power inlet  127  of the power control module  1  is electrically connected to the charge controller loop  121 , while the charge controller loop  121 , the buck-boost converter loop  122 , and the power manager loop  123  are electrically connected together. The power manager loop  123  is electrically connected to the button switch  124  and the indicator light set  125 . Meantime, the buck-boost converter loop  122  is electrically connected to the power outlet  128  and the first port  126 . 
         [0026]    The button switch  124 , the indicator light set  125 , the first port  126 , the power inlet  127 , and the power outlet  128  of the circuit board  12  are exposed outside the enclosure  11  of the power control module  1  to be visible, accessible and operable to a user from exterior. 
         [0027]    Therein, the power inlet  127  is adaptive to connect a terminal of an adapter and input a DC power to the power control module  1 . The power outlet  128  is adaptive to connect a battery of a portable electronic device that is to be charged. 
         [0028]    As shown in  FIG. 1 , the enclosure  21  of each of the individual battery units  2 ,  3 ,  4 ,  5  has its top formed with an accommodating recess  22 . The individual battery unit  2  has therein a controller  23 , a cell  24 , a second port  25  and a third port  26 . The controller  23  is electrically connected to the cell  24 , the second port  25  and the third port  26 . The second port  25  faces the accommodating recess  22  of the enclosure  21 , and the third port  26  is located at a side of the enclosure  21 . The enclosure  21  of the individual battery unit  2  has a positioning pin  27  and a retaining hook  28  in the accommodating recess  22 . Each of the individual battery units  2 ,  3 ,  4 ,  5  has its back provided with a positioning hole  271  and a fixing hole  281  corresponding to the positioning pin  27  and the retaining hook  28  on another said individual battery unit, respectively. 
         [0029]    As shown in  FIG. 3  and  FIG. 4 , to assemble the components, the power control module  1  slides into the accommodating recess  22  of the enclosure  21  of the individual battery unit  2 , such that the first port  126  of the power control module  1  gets electrically connected to the second port  25  open to the accommodating recess  22  of the individual battery unit  2 , and, at the same time, the positioning hole  13  and the fixing hole  14  of the power control module  1  get engaged with the positioning pin  127  and the retaining hook  28  of the individual battery unit  2 , respectively. 
         [0030]    As shown in  FIG. 5  through  FIG. 7 , after the power control module  1  is assembled with the individual battery unit  2 , the second individual battery unit  3 , third individual battery unit  4 , fourth individual battery unit  5  and so on can be successively combined in the manner described previously to make the second port  25  of one battery unit electrically connected to and positioned by the third port  26  of another battery unit. 
         [0031]    By doing so, the device of the present invention can have the number of the individual battery units  2 ,  3 ,  4 ,  5  increased or decreased according to practical needs. Such a slide-in operation as shown in  FIG. 5  through  FIG. 7  allows a user to use as many battery units as he/she needs. The individual battery units  2 ,  3 ,  4 ,  5  thus assembled are convenient to carry for the user to charge his/her portable electronic devices anywhere and anytime. 
         [0032]    Referring to  FIG. 8  and  FIG. 10 , the power control module  1  and each of the individual battery units  2 ,  3 ,  4 ,  5  may alternatively have their first port  126  and third port  26  located at the backs of their enclosures  11 ,  21 , respectively. In such a case, the user can assemble the power control module  1  and the individual battery unit  2  and/or the additional battery units  3 ,  4 ,  5  through a stacking operation instead of the foregoing slide-in operation where the components are stacked vertically as an integral.