Patent Publication Number: US-2016233515-A1

Title: Electrode plate and battery including the same

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a battery, especially to an electrode plate of a battery. 
     2. Description of the Prior Art 
     Recently, batteries become much thinner to be available for thin-type electronic devices such as electronic credit card. A conventional electrode plate is formed from a cut base plate spread with anode or cathode activating layer. The base plate has to be preserved with some area without the activating layer for welding with the conducting arm. A typical one is shown in patent TW 481935. 
     However, preserving the area for welding results in that the area of the activating layer is reduced to have smaller battery capacity. Besides, the step of welding consumes much time and makes the battery thicker. In addition, the solder between the base plate and the conducting arm increases the resistance therebetween. 
     SUMMARY OF THE INVENTION 
     The main object of the present invention is to provide an electrode plate and a battery having the electrode plate which are advantageous in thinning the battery, improving efficiency of electrical conduction, and increase battery capacity. 
     To achieve the above and other objects, an electrode plate is provided. The electrode plate is adapted for being arranged in a battery. The electrode plate includes a base plate and a conducting arm. The base plate is adapted for being received in the battery. The base plate is electrically conductive and has a first face and a second face. At least part of the second face is a coarse surface for connecting with a shell of the battery. The conducting arm is integrally formed on a side of the base plate and is protruded from the battery when the electrode plate is arranged in the battery. 
     To achieve the above and other objects, a battery is also provided. The battery includes two electrode plates mentioned above, an electrolysis layer, an anode activating layer, a cathode activating layer, and a shell. The anode activating layer is sandwiched between one side of the electrolysis layer and the base plate of one of the electrode plates, and the cathode activating layer is sandwiched between an opposite side of the electrolysis layer and the base plate of the other one of the electrode plates. The shell covers the two base plates, the electrolysis layer, the anode activating layer, and the cathode activating layer. Each of the conducting arms is exposed outside the battery. 
     Thereby, the integrally formed conducting arm and base plate can shorten the process of manufacturing and make the electrode plate thinner. Besides, without the solder between the conducting arm and the base plate, the resistance therebetween is reduced so as to improve the efficiency of electrical conduction. In addition, there is no necessary to reserve area of the base plate for welding, so the area of the activating layer can be increased so as to increase the battery capacity. Furthermore, the shell is easier to be adhered to the electrode plate due to the coarse surface. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1 and 2  are stereograms of an electrode plate showing a first embodiment of the present invention; 
         FIGS. 3 and 4  are illustrations of the anode activating layer and the electrode plate showing a first embodiment of the present invention; 
         FIGS. 5 and 6  are illustrations of the cathode activating layer and the electrode plate showing a first embodiment of the present invention; 
         FIG. 7  is an illustration of a battery showing a first embodiment of the present invention; 
         FIG. 8  is a cross-section of a shell showing a first embodiment of the present invention; 
         FIG. 9  is a stereogram of a battery showing a first embodiment of the present invention; 
         FIG. 10  is a cross-section of a battery showing a first embodiment of the present invention; 
         FIG. 11  is a partial enlargement of  FIG. 10 ; 
         FIG. 12  is a breakdown drawing of a battery showing a second embodiment of the present invention; 
         FIG. 13  is a stereogram of a battery showing a second embodiment of the present invention; 
         FIG. 14  is a cross-section of a battery showing a second embodiment of the present invention; 
         FIG. 15  is a partial enlargement of  FIG. 14 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Please refer to  FIG. 1  to  FIG. 2  for a preferable embodiment of the present invention. The electrode plate  1  of the present invention is adapted for being arranged in a battery. The electrode plate  1  includes a base plate  10  and a conducting arm  11 . 
     The base plate  10  is adapted for being arranged inside the battery. The base plate  10  is electrically conductive and has a first face  100  and a second face  101 . Specifically, at least part of the second face  101  is a coarse surface for connecting with a shell of the battery. In the present embodiment, the whole second face  101  is the coarse surface to improve the adhesion between the base plate  10  and the shell. In practice, the coarse surface can be formed by electric corrosion. Alternatively, the coarse surface can be formed by scratching the second face  101  to form a plurality of grooves, or be formed by spreading a film having a plurality of bumps. 
     The base plate  10  is made of aluminum, copper, or stainless steel. More specifically, when the base plate  10  is used as an anode, the base plate  10  made of aluminum is preferable. When the base plate  10  is used as a cathode, the base plate  10  made of copper is preferable. Alternatively, the base plates  10  used as anode and cathode can be made both stainless steel. In other possible embodiments, the base plate can be made of other electrically conductive material. 
     The conducting arm  11  is integrally formed at a side of the base plate  10 . Specifically, the base plate  10  and the conducting arm  11  are formed as a single piece by cutting. Preferably, the thickness of the base plate  10  is ranged between 18 micrometers to 22 micrometers. In the present embodiment, the thickness of the base plate  10  is 20 micrometers. Comparing with the thickness of 70 micrometers to 100 micrometers of the conventional base plate with conducting arm welding thereon, the base plate of the present embodiment is significantly thinner so that the electrode plate  1  of the present embodiment is advantageous in thinner batteries. When the electrode plate  1  is arranged in the battery, the conducting arm  11  is exposed outside the battery for conducting. 
     Please refer to  FIGS. 3 to 11 , a battery  2  is also provided. The battery  2  includes two electrode plates  1  shown in  FIGS. 1 and 2  and further includes an electrolysis layer  20 , an anode activating layer  21 , a cathode activating layer  22 , and a shell  23 . 
     The anode activating layer  21  is sandwiched between one side of the electrolysis layer  20  and one of the base plates  10 , and the cathode activating layer  22  is sandwiched between the other side of the electrolysis layer  20  and the other one base plate  10 . 
     The shell  23  covers the two base plates  10 , the electrolysis layer  20 , the anode activating layer  21 , and the cathode activating layer  22 . The conducting arm  11  is exposed outside, at least partially. In the present embodiment, the shell  23  is made of composite material. The shell  23  includes an aluminum foil layer  230  and two first insulation layers  231 . Each first insulation layer  231  is sandwiched between one of the base plates  10  and the aluminum foil layer  230 . In this embodiment, the shell  23  further includes two second insulation layers  232 . The second insulation layer  232  is disposed on two sides of the aluminum foil layer  230 . Specifically, the first insulation layer  231  is made of thermoplastic plastic layer, such as polypropylene or polyethylene. When the battery is packaged by thermo compression, the thermoplastic plastics melts to facilitate the adhesion. The second insulation layer  232  is made of nylon to protect the battery. 
     In the process of manufacturing, the base plates  10  are fixed onto the shell  23  by thermo compression under a specific pressure and temperature. The coarse surfaces of the base plates  10  contact the shell  23 , and at least part of each of the conducting arms  11  does not touch the shell  23 . And then, the anode activating layer  21  and the cathode activating layer  22  are spread over the first faces  100  of the base plates  10 . Alternatively, the activating layers are spread before the base plates  10  are fixed onto the shell  23 . Thereafter, fold the shell  23  and insert the electrolysis layer  20  between the anode activating layer  21  and the cathode activating layer  22 . Finally, package the fringes of the shell  23  by thermo compression. 
     Another embodiment is shown in  FIGS. 12 to 15 . The shell  30  of the battery  3  includes a first shell member  31  and a second shell member  32  which are independent from each other. Thus, the step of folding is skipped. Fringes of the first shell member  31  and the second shell member  32  are packaged by thermo compression. 
     In conclusion, the electrode plate and the battery of the present invention have advantages listed below.
         1. The conducting arm and the base plate are formed as a single piece by cutting, so the step of welding can be skipped. Thus, efficiency is improved, and the thickness is reduced.   2. The resistance between the conducting arm and the base plate is reduced.   3. There is no necessary to preserve any area of the base plate for welding, so the area for the activating layer can be increased so as to increase the battery capacity.   4. The coarse surface facilitates the adhesion between the electrode plate and the shell during thermo compression.