1. Field of the Invention
The present invention relates to a connecting structure for exteriorly connecting battery cells which is weldless and resistant to oxidation and can provide a high conductivity connection among many battery cells.
2. Description of the Prior Art
The existing high power battery assemblies are mainly constructed by connecting multiple battery cells in series, parallel or series-parallel through connecting sheets. The positive and the negative electrode terminals of the respective battery cells are normally made of the nickel or nickel-plated metal, and so are the connecting sheets because of the advantage that nickel is resistant to oxidation and hence more secure for long services. As for the battery cells 11 in a conventional battery assembly, as shown in
It is to be noted that, the above connecting technology for conventional battery cell can electrically connect two battery cells through nickel connecting sheets by spot welding; but, it suffers from many disadvantages such as:
1. After being used for a long time, the nickel connecting sheets will still be eventually oxidized or contaminated with foreign matters, thus increasing the electric resistance of the connecting sheets.
2. The nickel connecting sheets are connected to the electrode terminals of the battery cells through the welding spots typically in small contact areas, resulting in high contact resistance, thus causing increase in temperature of the electrode terminals of the battery cells as well as the welding spots plus extra power losses of the battery cells during the recharging or discharging processes.
3. The nickel connecting sheets are expensive; and, the welding process is time-consuming and labor intensive, making the conventional battery connecting technology uneconomic.
Hereafter, the present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary objective of the present invention is to provide a connecting structure for exteriorly connecting battery cells in accordance with the present invention mainly utilizes at least one connecting graphite alloy block serving as a bridge for connecting two battery cells in series or parallel. In the present invention, the connecting graphite alloy block is connected to the electrode terminals of the battery cells in a direct contact manner to realize a highly conductive connection without utilization of the conventional welding procedures. Furthermore, the connecting graphite alloy block is less-expensive compared to nickel so that the production cost can be greatly reduced.
The secondary objective of the present invention is to provide a connecting structure for exteriorly connecting battery cells which mainly utilizes a connecting graphite alloy block to electrically connect two battery cells in series or parallel. The connecting graphite alloy block by itself is resistant to oxidation. After close mutual contact, the connecting graphite alloy block and the positive, the negative electrode terminals of the battery cells will start a process of dissolving in each other, namely the process of carbon particles of the connecting graphite alloy block substituting for the foreign matters on the surfaces of the negative and the positive electrode terminals of the battery cells so as to fill the voids in the metallic surfaces of the negative and the positive electrode terminals of the battery cells until forming a carbon-nickel miscible alloy, thus ensuring a smooth large-current discharge due to reduction of the external connection resistance.
In order to achieve the above objectives, a connecting structure for exteriorly connecting battery cells in series in accordance with the present invention comprises: a first battery cell which is exteriorly provided with a positive electrode terminal and a negative electrode terminal both made of nickel-plated metal and served as power output terminals of the first battery cell; at least one connecting graphite alloy block which is made of a graphite alloy selected from a group consisting of silver graphite, copper graphite, and silver-copper graphite and connected to the positive electrode terminal of the first battery cell; and a second battery cell which is exteriorly provided with a positive electrode terminal and a negative electrode terminal both made of nickel-plated metal and served as power output terminals of the second battery cell. The negative electrode terminal of the second battery cell is connected to the connecting graphite alloy block so as to connect the first battery cell and the second battery cell in series.
Furthermore, a connecting structure for exteriorly connecting battery cells in parallel comprises: a first battery cell which is exteriorly provided with a positive electrode terminal and a negative electrode terminal both made of nickel-plated metal and served as power output terminals of the first battery cell; at least one first connecting graphite block which is made of a graphite alloy selected from a group consisting of silver graphite, copper graphite, and silver-copper graphite and connected to the positive electrode terminal of the first battery cell; a second battery cell which is exteriorly provided with a positive electrode terminal and a negative electrode terminal both made of nickel-plated metal and served as power output terminals of the second battery cell, the positive electrode terminal of the second battery cell is connected to the first connecting graphite block; and at least one second connecting graphite block which is made of a graphite alloy selected from a group consisting of silver graphite, copper graphite, and silver-copper graphite and connected to the negative electrode terminal of the first battery cell and the negative electrode terminal of the second battery cell so as to connect the first and the second battery cells in parallel.
The present invention will be easily comprehended from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
Referring to
The first battery cell 20 is a cylindrical battery cell and exteriorly provided on both ends thereof with a positive electrode terminal 21 and a negative electrode terminal 22 both being made of nickel-plated metal and served as power output terminals of the first battery cell 20.
The connecting graphite alloy block 30 is made of a graphite alloy selected from a group consisting of silver graphite (silver-carbon alloy), copper graphite (copper-carbon alloy), and silver-copper graphite (silver-copper-carbon alloy). The connecting graphite alloy block 30 is electrically connected to the positive electrode terminal 21 of the first battery cell 20 in a close contact manner.
The second battery cell 40 is exteriorly provided on both ends thereof with a positive electrode terminal 41 and a negative electrode terminal 42 both being made of nickel-plated metal and served as power output terminals of the second battery cell 40. The negative electrode terminal 42 of the second battery cell 40 is electrically connected to the connecting graphite alloy block 30 in a close contact manner. A spring 50 and a supporting plate 51 are employed to push against the connecting graphite alloy block 30 in close contact with the first and the second battery cells 20, 40. Thereby, the first and the second battery cells 20, 40 are connected in series.
In addition, the negative electrode terminal 22 of the first battery cell 20 and the positive electrode terminal 41 of the second battery cell 40 each can be connected to a graphite terminal 401, 402 as a final power output terminal thereof. Each of the graphite terminals 401, 402 is interiorly provided with a wire 403, 404 serving as a power output wire thereof.
Further referring to
The first battery cell 60 is a cylindrical battery cell and exteriorly provided on both ends thereof with a positive electrode terminal 61 and a negative electrode terminal 62 both being made of nickel-plated metal and served as power output terminals of the first battery cell 60.
The first connecting graphite alloy block 70 is made of a graphite alloy selected from a group consisting of silver graphite (silver-carbon alloy), copper graphite (copper-carbon alloy), and silver-copper graphite (silver-copper-carbon alloy). The first connecting graphite alloy block 70 is electrically connected to the positive electrode terminal 61 of the first battery cell 60 in a close contact manner.
The second battery cell 80 is a cylindrical battery cell and exteriorly provided on both ends thereof with a positive electrode terminal 81 and a negative electrode terminal 82 both being made of nickel-plated metal and served as power output terminals of the second battery cell 80. The positive electrode terminal 81 of the second battery cell 80 is electrically connected to the first connecting graphite alloy block 70 in a close contact manner.
The second connecting graphite alloy block 90 is made of a graphite alloy selected from a group consisting of silver graphite (silver-carbon alloy), copper graphite (copper-carbon alloy), and silver-copper graphite (silver-copper-carbon alloy. The second connecting graphite alloy block 90 is connected to the negative electrode terminal 62 of the first battery cell 60 and the negative electrode terminal 82 of the second battery cell 80. Two sets of springs 50a, 50b and supporting plates 51a, 51b are employed for pushing against the first and the second connecting graphite alloy blocks 70, 90, respectively in order to tightly contact the first and the second battery cells 60, 80. Thereby, the first and the second battery cells 60, 80 are connected in parallel.
In addition, the first and the second connecting graphite alloy blocks 70, 90 each are interiorly provided with a wire 405, 406 serving as a power output wire thereof.
The aforementioned is the summary of the positional and structural relationship of the respective components of the preferred embodiment in accordance with the present invention.
As for the function of the present invention, the present invention mainly utilizes connecting graphite alloy blocks to directly connect the battery cells in series or parallel without utilization of the conventional welding procedures, thus improving the connective conductivity and reducing the production costs because of elimination of the conventional welding procedure.
It is to be noted that, referring to
Referring to
In addition to the cylindrical metal-cased battery cells, as shown in
While we have shown and described various embodiments in accordance with the present invention, it is comprehensive to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
This application is a continuation of part of U.S. patent application Ser. No. 12/418,596, which claims the benefit of the earlier filing date of Apr. 05, 2009. Claims 1 of this application is revised from the previous claim 1 of the U.S. patent application Ser. No. 12/418,596, Claims 2-3 of this application correspond to the previous claims 5-6 of the U.S. patent application Ser. No. 12/418,596, Claim 4 of this application is revised from the previous claim 2 of the U.S. patent application Ser. No. 12/418,596, and Claim 5 of this application is new.
Number | Date | Country | |
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Parent | 12418596 | Apr 2009 | US |
Child | 12510996 | US |