Patent Publication Number: US-2011064994-A1

Title: Power supply assembly

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to battery, and more particularly, to a power supply assembly. 
     2. Description of the Related Art 
     The electricity required for startup and ignition system of a car usually comes from the lead-acid battery. Because the lead-acid battery includes the advantages of low cost, less memorability, safety, and high working temperature, it is still very popular. 
     However, the lead-acid battery has a shorter cycle life to have a shorter working life. Besides, the lead-acid battery needs more time to recharge itself and has a higher self-discharge rate, i.e. the stored electric energy still easily consumes itself. If the battery is located under the low-temperature environment, its discharge will be subject to instability. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a power supply assembly which can discharge stably, have a longer working life, and have preferable discharging effect under the low-temperature environment. 
     The foregoing objective of the present invention is attained by the power supply assembly composed of an electric storage device and an electric energy conversion device. The electric storage device includes two electrodes. The electric energy conversion device includes at least one lithium iron phosphate battery. The at least one battery is electrically connected with the electrodes. In light of this, the power supply assembly can have denser electric storage and higher discharge rate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram of a preferred embodiment of the present invention. 
         FIG. 2  is a block diagram of the electric energy conversion device in accordance with the preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Referring to  FIG. 1 , a power supply assembly constructed according to a preferred embodiment of the present invention is composed of an electric storage device  10  and an electric energy conversion device  20 . In this embodiment, the electric storage device  10  is a lead-acid battery having highly dense electric storage and includes a first electrode  12  and a second electrode  14 . 
     Referring to  FIG. 2 , the electric energy conversion device  20  includes a plurality of lithium iron phosphate batteries  22 , and a supercapacitor  24 . Specifically, the batteries  22  are eight in number in this embodiment and can be electrically connected with one another by parallel connection of two pairs, each of which has four batteries  22  connected in series, and then connected with the supercapacitor  24  in parallel. 
     When the electric storage device  10  is mounted to a car, the first electrode  12  and the second electrode  14  are connected with an electric circuit  30  of the car. Electric energy stored in the electric storage device  10  can be supplied to an starting motor or an ignition coil of the car for operation. Because the battery  22  of the electric energy conversion device  20  is made of lithium iron phosphate to have high power and the supercapacitor  24  can be charged and discharged in no time, the car can be more efficiently ignited to cause less fuel consumption. 
     When the power generator of the car charges the electric storage device  10 , the electric energy conversion device  20  is first quickly charged with electric energy and then the electric energy continues to be charged into the electric storage device  10 . For this reason, even though the engine of the car runs in low rotation, the electric storage device  10  can be stably charged. 
     In addition, the electric energy conversion device  20  can be either combined with the electric storage device  10  or mounted to a housing and then additionally mounted to the electric storage device  10  for convenient application. 
     In conclusion, the power supply assembly can have denser electric storage and higher discharge rate, such that the present invention can discharge stably, have a longer working life, and have preferable discharging effect under the low-temperature environment. 
     Although the present invention has been described with respect to a specific preferred embodiment thereof, it is in no way limited to the specifics of the illustrated structures but changes and modifications may be made within the scope of the appended claims.