JPS59169076A - Manufacture of multicell - Google Patents

Abstract

PURPOSE:To simply and efficiently provide a mechanically and electrically stabilized multicell by placing a metal container of other unit cell between standing parts of a metal plate and spot-welding the metal plate and the container in two facing positions of the standing parts. CONSTITUTION:Standing parts 18 of a metal plate 14 between which a unit cell 20 is placed is placed between a set of electrodes 20 and 22 for spot-welding which are facing each other. The standing parts 18 and sides of a metal container 10 are simultaneously spot-welded with a set of electrodes 20 and 22. One of the welding electrodes 20 and 22 is a fixed electrode and the other is movable electrode and spot-welding is made from the facing direction. Thereby, a stabilized multicell is simply and efficiently provided without using a plurality of welders or a large scale welder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an assembled battery, and particularly to a method using a unit cell configured such that a metal container housing a power generating element also serves as a circumferential terminal.

For example, LP01 type button batteries are often used alone, but they can also be used as unit cells, stacked and connected in series to form a collective battery with a predetermined electromotive force. It often happens. When manufacturing such an assembled battery, multiple unit cells are stacked and connected in a series connection direction, but in this case, the connection on each side must be made reliably both electrically and mechanically. Must be.

Therefore, prior to making the present invention, the present inventors completed a method for manufacturing an assembled battery as shown in FIGS. 1 and 2. In the method illustrated in FIG. A metal plate 14 that is bent along the same direction is used.

Then, a first step of spot welding the central surface portion 16 of the metal plate 14 to the negative electrode terminal surface 12 of the unit cell 20 is performed (FIG. 1). After this, the rising portion 1 of the metal plate 14 is
The metal container 10 of another unit cell 20 is held between 8,
A second step is performed in which the metal plate 14 and the metal container 10 are spot welded at two opposing positions of the rising portion 18, respectively. This allows a plurality of unit cells 20, 20, . . . to be stacked and connected in the series connection direction as shown in FIG. The assembled battery manufactured in this way has a capacity of 20.20 for each unit cell,...
...The spaces are spot welding points PI, P2. P 3
By connecting them, a stable and reliable connection can be obtained both electrically and mechanically.

By the way, in the above-mentioned method, the spot welding between the metal container 10 and the rising portion 14 of the metal plate 14 in the second step must be performed at at least two locations, two positions facing each other. No. If only one side is spot welded, the unit cell 20 and the metal plate 14
are connected with each other in an inclined state, and when a plurality of them are stacked and connected in the serial connection direction, the inclination becomes greatly noticeable. Further, they have the disadvantage that they have poor shape stability when stacked and connected, and are easily deformed by force in the bending direction. Therefore, as shown in Figure 2,
The metal plate 14 and the unit cell 20 are connected to at least three spot welding points P1. P2. It must be connected at P3. In particular, the rising portion 18 of the metal plate 14 and the side portion of the metal container 10 must be spot welded at two positions facing each other.

3- Therefore, conventionally, as shown in FIGS. 3a and 3b, two spot welding electrodes 22 and 24 are used to first perform spot welding on one side as shown in FIG. 3a. Next, as shown in the same figure, rotate the cable chain m2° by 180°,
Spot welding is performed again at a location opposite to the previously spot welded location P1.

Thereby, spot welding points Pi and P2 can be formed at two positions facing each other.

However, in the method described above, the metal plate 1
Two welding steps had to be performed in order to spot weld the raised portion 18 of 4 and the side of the metal container 10. Furthermore, between the two welding processes, 20 unit cells were
There is also the trouble of having to perform an operation of rotating the lens by 180'. Also, if you want to form the two welding points P1 and P2 at the same time, you will need one pole 22. An additional pair of 24 is required, resulting in the inconvenience that the welding equipment is complicated and the □゛ size becomes flat.

In addition, in the above-mentioned method, as shown in FIG. 3, two welding points P1. P1 or P2゜P2 is formed, but only the two positions P1 and P2 facing each other are required, and even if two welding points are formed side by side on one side, it is not expected to have a meaningful effect. I can't. What is required is to form welding points P1 and P2 at two positions opposite each other.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to provide equipment and operations that are simpler than conventional ones, without making the equipment complicated or large-scale. It is an object of the present invention to provide a method for manufacturing an assembled battery, which makes it possible to ensure that the stacked and connected state between unit cells is mechanically and electrically stable and reliable.

In order to achieve the above object, the manufacturing method according to the present invention stacks and connects a plurality of unit cells in series in a manner that the metal container housing the power generation element also serves as a circumferential terminal. In the method for manufacturing an assembled battery, a central surface portion of a metal plate formed by bending from the outer bottom surface of the metal container along at least a part of the side portion is spot welded to the other terminal surface of the unit cell. In the first step, a metal container of another unit cell is placed between the rising portion of the metal plate, and the metal plate and the metal container are respectively spotted at two positions facing each other on the rising portion. By performing the second process of welding, multiple unit cells can be stacked and connected in series.
Then, in the second step, the rising part of the metal plate holding the wire is placed between a pair of spot welding electrodes made of two facing each other, and the rising part of the metal plate is connected by this pair of electrodes. It is characterized in that the part and the side part of the metal container are simultaneously spot welded at two positions facing each other.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. Note that the middle or corresponding portions in each figure are indicated by the same reference numerals.

First, the method for manufacturing an assembled battery according to the present invention is basically the same as the conventional method described above. That is, for example, LP
Like the 01 type button type battery, a unit cell 20 is configured such that the metal container 10 housing the power generation element also serves as a positive terminal, and the metal container 10 has a battery 20 along at least a part of the side from the outer bottom surface of the metal container 10. A bent metal plate 14 is used.

Then, as shown in FIG. 1, a first step of spot welding the central surface portion 16 of the metal plate 14 to the negative terminal surface 12 of the unit cell 20 is performed. After this, the metal plate 14
The metal container 10 of another unit cell 20 is held between the rising portions 18 of the above, and the metal plate 14 and the metal container 10 are spot-welded at two mutually opposing positions of the rising portions 18. Perform step 2. The metal plate 14 is
In this embodiment, one bent into a cup shape is used.

This embodiment differs from the conventional example described above in that in the second step, as shown in FIGS. 4 and 5, the metal plate 14 enclosing the unit cell 20 is The rising portion 18 is placed between a pair of spot welding electrodes 20.22 made of two electrodes facing each other, and the pair of electrodes 20.22 connects the rising portion 18 with the side portion of the metal container 7-10. spot welding at two positions facing each other at the same time. The welding electrodes 20.22 have one fixed electrode and the other movable electrode, and are energized by sandwiching the rising portion 18 from opposite directions,
Perform spot welding.

As a result, spot welding points P1. P2 is formed. What should be noted here is that the two spot welding points P1. P2 is formed simultaneously in one step. Furthermore, only one pair of welding electrodes 20, 22 is required, and therefore the equipment thereof can be simplified. Of course, there is no need to rotate the unit cell 20 by 180''. Furthermore, there are two spot welding points P facing each other between the side of the metal container 10 and the rising portion 18 of the metal plate 14.
1. Since they are connected at P2, the connection between them is very stable, and they are correctly positioned relative to each other. Therefore, even when multiple sheets are stacked and connected in the direction of direct connection, they have excellent shape stability and have sufficient strength to maintain the laminated shape even against bending forces. ing.

Here, the metal plate 14 has a thickness of, for example, 0.15 mm.
Thick nickel plated steel plate (plating thickness 2 to 7 microns)
It can be formed by drawing a micron).

Examples of welding conditions include welding energy of 18 to 23 W/sec and electrode pressing force of 1 to 4 KO.

Further, the metal plate 14 may be formed by bending a nickel-plated steel plate into a U-shape, as shown in FIG.

As described above, according to the method for manufacturing an assembled battery according to the present invention, an assembled battery in which a plurality of unit cells are stacked and connected in a series connection direction can be manufactured without using complicated or large-scale equipment, and without using troublesome processes. It is possible to manufacture an assembled battery easily and with high efficiency without performing any operations, and which is also mechanically and electrically stable.

[Brief explanation of drawings]

Figure 1 is a diagram showing the first step of connecting the unit cell and the metal plate by spot welding, and Figure 2 is a diagram showing the first process of connecting the unit cell and the metal plate by spot welding, and Figure 2 is a diagram showing the unit constructed using the connected unit of the unit cell and the metal plate obtained in the first step. A sectional view showing an example of an assembled battery, FIGS. 3a and 3b are upper sectional views showing an example of the conventional method, FIG. 4 is an upper sectional view showing the main parts of the manufacturing method according to the present invention, and FIG. FIG. 6 is a side cross-sectional view showing the main parts of the manufacturing method according to the present invention, and FIG. 6 is a small perspective view of another example of the metal plate. 10...Metal container that also serves as a positive electrode terminal 12...Negative electrode terminal surface 14...・・・・・・Metal plate 16...
・・・・・・・・・・・・Central surface part 18・・・・・・
......Rising part 20...
...Battery PI, P2. P3-・・・・・・・・・
・Spot welding location 20.22・・・・・・・・・・・・
・Welding electrode patent applicant Fuji Electrochemical Co., Ltd. Agent Patent attorney - Kensuke Shiro 11 - Figure 3 (a) Figure 6 Figure 4

Claims (1)

[Scope of Claims] (1) A method for manufacturing an assembled battery in which a plurality of unit cells are stacked and connected in series in a direction in which a metal container containing a power generation element is configured so as to serve as a circumferential terminal. a first step of spot welding a central surface portion of a metal plate bent from the outer bottom surface of the metal container along at least a portion of the side portion to the other terminal portion of the unit cell; A second step of inserting a metal container of another cell between the rising portions of the metal plate and spot welding the metal plate and the metal container at two mutually opposing positions of the rising portion. By doing this, a plurality of unit cells are stacked and connected in a series connection direction, and further, in the second step, the rising portions of the metal plates holding the unit cells are made to face each other.
The assembled battery is placed between a pair of spot welding electrodes, and the pair of electrodes simultaneously spot welds the rising part and the side part of the metal container at two positions facing each other. Production method. (2) A method for manufacturing an assembled battery, characterized in that the metal plate is bent into a cup shape in the method set forth in claim (1). In the method, the metal plate is bent into a U-shape.