ELECTRODE PLATE AND BATTERY INCLUDING THE SAME

An electrode plate adapted for being arranged in a battery includes a base plate and a conducting arm. The base plate is adapted for being arranged in a 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 connected with a shell of the battery. The conducting arm is integrally formed at a side of the base plate and is exposed outside the battery when the electrode plate is arranged in the battery.

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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer toFIG. 1toFIG. 2for a preferable embodiment of the present invention. The electrode plate1of the present invention is adapted for being arranged in a battery. The electrode plate1includes a base plate10and a conducting arm11.

The base plate10is adapted for being arranged inside the battery. The base plate10is electrically conductive and has a first face100and a second face101. Specifically, at least part of the second face101is a coarse surface for connecting with a shell of the battery. In the present embodiment, the whole second face101is the coarse surface to improve the adhesion between the base plate10and the shell. In practice, the coarse surface can be formed by electric corrosion. Alternatively, the coarse surface can be formed by scratching the second face101to form a plurality of grooves, or be formed by spreading a film having a plurality of bumps.

The base plate10is made of aluminum, copper, or stainless steel. More specifically, when the base plate10is used as an anode, the base plate10made of aluminum is preferable. When the base plate10is used as a cathode, the base plate10made of copper is preferable. Alternatively, the base plates10used 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 arm11is integrally formed at a side of the base plate10. Specifically, the base plate10and the conducting arm11are formed as a single piece by cutting. Preferably, the thickness of the base plate10is ranged between 18 micrometers to 22 micrometers. In the present embodiment, the thickness of the base plate10is 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 plate1of the present embodiment is advantageous in thinner batteries. When the electrode plate1is arranged in the battery, the conducting arm11is exposed outside the battery for conducting.

Please refer toFIGS. 3 to 11, a battery2is also provided. The battery2includes two electrode plates1shown inFIGS. 1 and 2and further includes an electrolysis layer20, an anode activating layer21, a cathode activating layer22, and a shell23.

The anode activating layer21is sandwiched between one side of the electrolysis layer20and one of the base plates10, and the cathode activating layer22is sandwiched between the other side of the electrolysis layer20and the other one base plate10.

The shell23covers the two base plates10, the electrolysis layer20, the anode activating layer21, and the cathode activating layer22. The conducting arm11is exposed outside, at least partially. In the present embodiment, the shell23is made of composite material. The shell23includes an aluminum foil layer230and two first insulation layers231. Each first insulation layer231is sandwiched between one of the base plates10and the aluminum foil layer230. In this embodiment, the shell23further includes two second insulation layers232. The second insulation layer232is disposed on two sides of the aluminum foil layer230. Specifically, the first insulation layer231is 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 layer232is made of nylon to protect the battery.

In the process of manufacturing, the base plates10are fixed onto the shell23by thermo compression under a specific pressure and temperature. The coarse surfaces of the base plates10contact the shell23, and at least part of each of the conducting arms11does not touch the shell23. And then, the anode activating layer21and the cathode activating layer22are spread over the first faces100of the base plates10. Alternatively, the activating layers are spread before the base plates10are fixed onto the shell23. Thereafter, fold the shell23and insert the electrolysis layer20between the anode activating layer21and the cathode activating layer22. Finally, package the fringes of the shell23by thermo compression.

Another embodiment is shown inFIGS. 12 to 15. The shell30of the battery3includes a first shell member31and a second shell member32which are independent from each other. Thus, the step of folding is skipped. Fringes of the first shell member31and the second shell member32are 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.