JPS5819858A - Storage battery and its manufacture - Google Patents

Abstract

PURPOSE:To increase the manufacturing efficiency of a storage battery, and enable the manufacture to be applied to a small storage battery by compulsorily fitting an inter-cell connecting part into frame pieces, which are attached to the cut parts of the partition walls of a container by interposing a surfactant between the cut parts and the frame pieces, and subjecting the container and the lid of the battery to thermal fusion. CONSTITUTION:A partition wall 2 of a container 1 is provided with a cut 3, and a frame piece 4 made of a synthetic resin and having a grooved structure is attached to the cut 3, with a surfactant interposed between the cut 3 and the piece 4. Next, a set of an electrode group 6, which is constituted by connecting adjacent cells at the level of a strap, is inserted into the electrode group 6. At the same time, an inter-cell connecting part 8 is compulsorily fitted into the frame piece 4. After that, a surfactant is applied to the upper surface of the part 8 and the lower surface of a lid touching the above upper surface, and the container 1 and the lid are fused. Since the airtightness of the part 8 can be secured without using any injection metal mold, the above manufacture can be applied to a small storage battery, and can increase the manufacturing efficiency of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage battery in which cells are connected through a notch provided in a partition wall of a battery case, and a method for manufacturing the same.

Typical examples of this type of storage battery that have been proposed so far are:
As a means to ensure the liquid tightness of the partition wall notch, a sealing body is formed by injecting synthetic resin into the gap between the notch and the inter-cell connection section.

However, this method requires inserting an injection mold into the battery case to form the sealed body, which not only cannot be applied to small storage batteries but also has the disadvantage of low production efficiency. The vibrations loosen the adhesion between the inter-cell connections and the sealing body, resulting in loss of liquid tightness between the cells or corrosion of the connections due to permeation of the electrolyte.

The object of the present invention is to provide a storage battery that eliminates the above-mentioned drawbacks and a manufacturing method thereof.9 The storage battery according to the present invention is:
In a storage battery in which adjacent cells are connected at the level of the strap, the inter-cell connection part is forcibly inserted into a synthetic resin frame piece that is fitted into the partition wall notch of the battery case via a surfactant, and the battery case and lid are It is characterized by the fact that it is thermally welded, and its manufacturing method involves ``fitting a frame piece made of synthetic resin with a groove that fits into the partition wall cutout of the battery case into the cutout via a surfactant. After mounting, insert a series of electrode plates connecting adjacent cells at the level of the strap into the battery case, and forcefully insert the inter-cell connection part into the frame piece. This method is characterized by applying a surfactant to the bottom surface of the lid that contacts the top surface, and then thermally welding the battery case and the lid.

The present invention will be explained below based on nine examples.

First of all, in Figures 1 to 6, 1 is polypropylene.
A battery case made of thermoplastic synthetic resin such as polyethylene, 2 is a partition wall,
3 is a partition notch, and 4 is a groove 5 that fits into the partition notch 5. A frame piece made of a thin plate made of the same material as the battery case 1, 6 a series of electrode plates connecting adjacent cells at the level of the strap 7, 8 an inter-cell connection section, and 9 formed into an inter-cell connection section 8. It was done. A fitting groove 10 with the frame piece 4 is a lid made of the same material as the battery case 1.

Next, the manufacturing method of the storage battery shown in FIG. 1 will be explained. First, as shown in FIG. 2, there is a battery case 1 provided with a partition wall notch 6, and as shown in FIG. 3, a frame provided with a groove 5 that fits into the notch 3. Prepare 4 pieces each. Therefore, the groove 5 or the partition notch 3
On the periphery of.

For example, after applying a surfactant such as a fluororesin-based perfluoro compound, the frame piece 4 is fitted into the partition wall notch 3 as shown in FIG.

Both are in close contact with each other in a liquid-tight state and prevent penetration of the electrolyte.

Note that it is desirable to apply the surfactant also to the inside of the frame piece 4 that comes into contact with the inter-cell connection part 8.

Subsequently, a series of electrode plates 6, which are formed by connecting instantaneous cells at the level of the strap 7, are inserted into the battery case 1 as shown in FIG. Insert 2 and then the top surface of the inter-cell connection section 8 or the lid 10 that comes into contact with the top surface
After applying the above-mentioned surfactant to the bottom surface of the battery case 1 and lid 1.
0 by heat welding using a conventional method, a storage battery in which the inter-cell connection portion 8 is ensured to be liquid-tight as shown in FIG. 1 can be obtained.

In the above embodiment, as shown in FIG.
Although shown in the figure, the fitting grooves 9 for fitting with the frame piece 4 are provided on the side and lower surfaces of the frame piece 4, but depending on the case, the fitting grooves on the side surfaces may be omitted.

Another example of the frame piece is a window frame-shaped piece (4') having an upper side with cuts 11 as shown in FIG. When using this frame piece 4'.

Before inserting the electrode plate group 6 into the battery case 1, the frame piece 4' may be wrapped around the inter-cell connection portion 8 in advance.

By the way, when a fluororesin-based perfluoro compound is used as a surfactant as in the example, it has a heat resistance of about 400°C, so the heat during thermal welding of the battery case and the lid (about 300°C)
~380°C).

As described above, the present invention is such that the frame piece is fitted into the partition wall notch of the battery case via a surfactant, and the inter-cell connection part is forcibly inserted into the piece. Liquid-tightness of the inter-cell connections can be ensured without using a mold.

Therefore, the present invention is not only applicable to small storage batteries, but also improves production efficiency, and since the inter-cell connections are forcibly inserted into the frame pieces, vibrations during use may prevent the close contact between the two. -No need to sleep.

It is possible to eliminate all of the above-mentioned conventional drawbacks.

Its industrial value is great.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional front view of the main parts of the storage battery of the present invention, Fig. 2 is a perspective view of the main parts of the battery case of the storage battery, Fig. 3 is a perspective view showing an example of a frame piece, and Fig. 4 is a frame in the partition wall notch. Fig. 5 is a perspective view of the main part of the battery case with the pieces fitted together, Figure 5 is a perspective view of the main part of the battery case with the electrode plate group, showing the inter-cell connection part being forcibly inserted into the frame piece, and Figure 6 is the connection between the cells. FIG. 7 is a longitudinal sectional front view of the connecting portion and a perspective view showing another example of the frame piece. 1: Battery case 3: Partition notch 4: Frame piece 5: Groove
6: Plate group 7: Strap 8: Connection between cells 1
0: Lid

Claims (1)

[Claims] 1) In a storage battery in which adjacent cells are connected at the level of the strap, the inter-cell connection portion is formed in a synthetic resin frame piece fitted into the partition wall notch of the battery case via a surfactant. A storage battery characterized by being forcibly inserted and having a battery case and a lid heat-welded. 2) The storage battery according to claim 1, which uses a fluororesin-based perfluoro compound as a surfactant. 3) After fitting a synthetic resin frame piece with a groove that fits into the partition wall cutout of the battery case into the partition wall cutout via a surfactant, connect adjacent cells at the level of the strap. After inserting a series of electrode plates consisting of a battery into the battery case and forcibly inserting the inter-cell connection part into the frame piece, a surfactant is applied to the upper surface of the inter-cell connection part or the lower surface of the lid that comes into contact with the upper surface. , a storage battery manufacturing method characterized by thermally welding a battery case and a lid.