JPS6243304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a battery having a spiral plate group.

Conventionally, in the manufacture of this type of battery, the connection between the plate terminals of the spiral plate group and the metal case was done by inserting a welding electrode through the space formed in the center of the spiral plate group and spot welding. is being carried out.
However, in order to form a spiral electrode plate group, it is necessary to sandwich the central part of a long strip separator or the vicinity of the end of two stacked long strip separators between two winding shafts each having a semicircular cross section. After rotation, a method is often used in which the anode plate and the cathode plate are arranged and rolled up with the separator interposed therebetween. In this case, when the two winding shafts are removed after winding the electrode plate group, the space in the center is divided into two by a separator, and the welding electrode necessary for connecting the electrode plate group and the metal case is inserted. This makes it difficult to automate, and even when done manually, the separator gets entangled with the welding electrode, making welding impossible or causing welding defects. Also,
In order to eliminate these drawbacks, as shown in Japanese Patent Application Laid-Open No. 54-49534, a space in which a welding electrode is inserted is created by cutting or fusing the separator that divides the central space of the spiral electrode group into two parts. However, a considerable load is required for the separator to cut or melt, and in some cases, the separator is pushed down without being cut or melted all the way to the bottom, causing the electrode group and metal case to Not only was it difficult to weld with the electrodes, but there was also the risk of short circuiting between the electrode plates, which was still not sufficient.

The purpose of the manufacturing method of the present invention is to eliminate the above-mentioned drawbacks, facilitate the insertion of welding electrodes, facilitate automation of welding, and eliminate the occurrence of defects. cross the space,
The separator that divides the central space into two parts is heated and moved by inserting a heated tapered metal rod into the central space, thermally deformed, and then welded into the central space. An electrode is inserted to weld the plate terminal and the metal case.
In addition, when inserting a metal rod into the center space, if it is inserted with a constant load, the separator that crosses the center space is likely to get tangled and the space will be blocked.
The insertion load of the metal rod is increased from 0 in proportion to the insertion resistance into the space.

An embodiment of the present invention will be described above with reference to the drawings.

FIG. 1 shows a heated metal rod 4 placed against a separator 3 that crosses a center space 2 of a spiral electrode plate group 1.
The metal rod is inserted by driving the air cylinder 12 with the metal rod 4 and the heating unit 10 suspended from the air cylinder 12 by a spring 11 as shown in FIG. At this time, no load is applied until the tip of the metal rod 4 comes into contact with the separator around the central space 2 or the separator 3 that crosses the space, and when insertion resistance occurs due to contact, this resistance The load increases gradually until it opposes the insertion resistance, and the metal rod 4 is inserted into the center space while gradually adding a load corresponding to the insertion resistance.

If the heating unit and metal rod are fixed and attached directly to the air cylinder, the output of the cylinder will be transmitted as is and will become the insertion load of the metal rod, but by interposing a cushioning material such as a spring, the insertion resistance will be reduced. The spring contracts in proportion to , and the insertion load is applied gradually increasing from 0.

In this example, even if the air cylinder is simply lowered at a constant speed, the moving speed of the tip of the metal rod decreases depending on the contact resistance, the spring contracts by the difference in travel distance, and the insertion load corresponding to the contraction is applied to the separator. will be joining. Furthermore, since the insertion load is applied slowly, the separator is heated and softened during that time, making it easy to move and deform, which is very convenient for processing.

Figure 2 shows the state of the central space 2 after the metal rod has been inserted, and the separator 3 indicated by the dotted line
is moved by heating and does not return to the position indicated by the dotted line due to thermal deformation. As shown in FIG. 4, a welding electrode 7 is inserted into this space, and the cathode plate terminal 8 and metal case 9 are welded together. Note that 5 is an anode plate and 6 is a cathode plate.

In addition, in the above embodiment diagram, the central part of one long strip separator is sandwiched between the winding shafts and rolled up. Of course, it can also be applied. Further, the metal rod may be inserted before or after the electrode plate group 1 is inserted into the case 9.

The present invention is a manufacturing method as described above, in which the separator that crosses the center space of the electrode plate group is heated and moved, and then the welding electrode is inserted to weld the electrode plate terminal and the metal case. The insertion of the welding electrode becomes smooth, there is no risk that the separator will become entangled with the welding electrode, making welding impossible or causing welding defects, and it becomes possible to fully automate the welding between the electrode plate terminal and the metal case.

Further, the transverse portion of the separator is a folded portion for winding up the electrode plate group into a spiral shape, and no inconvenience will occur even if this portion is heated and moved after the electrode plate group is wound up.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the state immediately before the separator of the spiral electrode plate group is heated and moved by a metal rod according to the method of the present invention, Fig. 2 is a top view showing the state after the separator is heated and moved, and Fig. 3 is a top view showing the state after the separator is heated and moved. FIG. 4 is a mechanical diagram showing a mechanism for inserting a heating metal rod into an electrode plate group, and FIG. 4 is a sectional view showing a welded state of the electrode plate terminal and metal case of the spiral type electrode plate group. 1...Spiral type electrode plate group, 3...Separator, 4
...metal rod, 5...anode plate, 6...cathode plate, 7...
... Welding electrode, 8 ... Cathode plate terminal, 9 ... Metal case, 10 ... Heating device, 11 ... Spring, 12 ...
air cylinder.

Claims (1)

[Claims] 1. The heating and moving means inserts a heated tapered metal rod into the center space at the beginning of winding of the spiral electrode group while gradually increasing its insertion load from 0 according to the insertion resistance. After thermally deforming the separator that crosses the separator and dividing it into two parts to make the center space a part, a welding electrode is inserted into the center space to weld the electrode plate terminal and the metal case. A method for manufacturing a spiral plate battery, characterized by performing the following steps.