JPH0613064A - Film pack type sealed lead acid battery unit - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a film pack type sealed lead acid battery unit capable of improving flexibility at a connecting portion. [Structure] An electrode plate group 4 is wrapped with a battery case forming film 5, and the opposing portion of the film 5 around the electrode plate group 4 is heat-welded 5a.
Then, the film pack type lead-acid battery 6 is sealed. A plurality of the film pack type sealed lead acid batteries 6,
The terminals are arranged adjacent to each other and the terminals are connected by the connecting portion 10 to form a film pack type sealed lead acid battery unit. The connecting portion 10 is formed by connecting the flexible conductors 7 connected to the electrode plates 1 and 2 to each other with the welding portion 8 and covering the surfaces of these flexible conductors 7 with the flexible insulator 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film in which a plurality of film pack type sealed lead-acid batteries are formed by connecting the terminals of adjacent electrode plate groups in series, parallel or series-parallel at a connecting portion. The present invention relates to a pack type sealed lead acid battery unit.

[0002]

2. Description of the Related Art Conventionally, a film pack-type hermetically sealed type in which an electrode plate group is wrapped with a battery case forming film, and the opposing portions of the film around the electrode plate group are hermetically sealed by a heat-welding portion. Lead-acid batteries may be used as single cells or as assembled batteries. When using in a battery pack, connect a plurality of terminals at the connection part and arrange each film pack type sealed lead acid battery on the same plane or stack them to
It constitutes an assembled battery of V, 10V and 12V. In this case, the connection portion is formed by welding the terminals with a rigid connecting plate or brazing with solder.

[0003]

However, since the connecting portion in the conventional film pack type sealed lead acid battery unit is formed by using the rigid connecting plate, the flexibility of the connecting portion is impaired, It is difficult to bend at the connection portion, and there is a problem that the use mode of the film pack type sealed lead acid battery unit is limited.

Further, since the conductor is exposed at the conventional connecting portion, there is a risk of a short circuit, resulting in low safety.

An object of the present invention is to provide a film pack type sealed lead acid battery unit capable of improving flexibility at a connecting portion.

[0006]

The structure of the present invention which achieves the above object will be described. In the present invention, the electrode plate group is wrapped with a battery case forming film, and the film around the electrode plate group is opposed to the film group. A film-pack sealed lead-acid battery in which a plurality of film-pack sealed lead-acid batteries whose parts are hermetically sealed by heat-sealed parts are formed by connecting the terminals of adjacent electrode plate groups at the connection part. In the storage battery unit, the connection portion is formed of a flexible conductor connected to the mutual electrode plates and a flexible insulator covering the surface of the flexible conductor.

[0007]

When the connecting portion is formed of the flexible conductor connected to the electrode plates and the flexible insulator covering the surface of the flexible conductor as described above, the flexibility of the connecting portion is improved. Therefore, the connecting portion is easily bent, and there is no restriction on the mode of use of the film pack type sealed lead acid battery unit.

Further, even if the conductor of the connecting portion is a flexible conductor, since the surface of the flexible conductor is covered with a flexible insulator to reinforce it, the strength of the flexible conductor can be prevented from lowering.

Further, since the surface of the conductor of the connecting portion is covered with the flexible insulator, the occurrence of short circuit can be prevented and the safety can be improved.

[0010]

1 to 3 show a first embodiment of a film pack type sealed lead acid battery unit according to the present invention.

In this embodiment, an electrode plate group 4 consisting of an anode plate 1 and a cathode plate 2 each having a thickness of 3.2 mm and a separator 3 is wrapped with a battery case forming film 5, Two film pack-type sealed lead-acid batteries 6 are used, which are formed by hermetically sealing the opposing portions of the film 5 around the plate group 4 with the heat-welding portion 5a. The two film pack type sealed lead-acid batteries 6 are arranged next to each other on the same plane in a state where one battery 6 is turned upside down with respect to the other battery for series connection.

In such a film pack-type sealed lead-acid battery 6, a positive electrode plate 1 of one of the lead-acid batteries 6 to be connected and a cathode plate 2 of the other lead-acid battery 6 of 200 μm as terminals are connected. Flexible conductors 7 made of lead foil having a thickness are connected in advance by welding portions 8. The lead-out portion of the flexible conductor 7 is also sealed by the heat-welded portion 5a of the film 5. A part of the film 5 is laminated on the lower surface of the lead-out portion of the flexible conductor 7 by heat fusion.

Mutual flexible conductors 7 are butted and connected to each other by a weld 8. In this way, above and below the connecting portion of the flexible conductor 7 connected by the welded portion 8,
A flexible insulator 9 made of a film that is compatible with the film 5 is provided along and is heat-welded to the heat-welded portions 5a on both sides. Thereby, the connection parts 10 of the left and right film pack type sealed lead-acid batteries 6 are formed.

A safety valve 11 is provided on the heat-welded portion 5a of the film 5 around the electrode plate group 4.

In such a film pack type sealed lead-acid battery 6, since the connecting portion 10 is flexible, the connecting portion 10 is flexible.
It can be bent easily at. In order to prevent an unreasonable force from being applied to the connecting portion of the flexible conductor 7 when bent around the center of the connecting portion 10, the position of the welded portion 8 is shifted from the bent portion 12 as shown in FIG. It is preferable to provide.

Further, the flexible conductor 7 is provided at the connecting portion 10.
Since the flexible insulator 9 and the like are covered, there is no risk of short circuit. Further, since the flexible conductor 7 is covered and reinforced with the flexible insulator 9, it is possible to prevent the strength from being lowered.

5A and 5B show the flexible conductor 7
2 shows two examples of the connection method of. Figure 5
In (A), an example is shown in which a concave portion is provided at the connecting end portion of one flexible conductor 7 and a convex portion is provided at the connecting end portion of the other flexible conductor 7, and both are fitted and connected. FIG. 5B shows an example in which the connecting ends of both flexible conductors 7 are cut at a right angle and the two are abutted and connected.

6A and 6B show the flexible conductor 7
This is an example in which an extension portion of the film 5 is provided outside the heat welding portion 5a on the side, and after the flexible conductors 7 on both sides are connected, the extension portions are superposed and heat welded.

FIG. 7 shows a second embodiment of the film pack type sealed lead acid battery unit according to the present invention.

In the film pack type sealed lead-acid battery unit of this embodiment, the collector of the anode plate 1 of one electrode plate group 4 is extended to form the flexible conductor 7, and similarly, the other electrode plate group. The current collector of the cathode plate 2 of No. 4 is extended to form the flexible conductor 7.

Both flexible conductors 7 are connected by a flexible printed board 14 in which a flexible conductor 13 is printed on a flexible insulator 12. That is, the flexible printed circuit board 14 is arranged so that the flexible conductor 13 is in contact with the flexible conductors 7 while straddling one surface of each of the flexible conductors 7. It is connected. On the other surface of both flexible conductors 7,
A flexible insulator 9 is arranged along the surface of the flexible conductor 7 and the film 5 by heat welding. In this way, the connecting portion 10 for connecting both film pack type sealed lead-acid batteries 6 is formed with flexibility.

Even with the connecting portion 10 having such a structure, the same effect as that of the first embodiment can be obtained.

FIG. 8 shows a third embodiment of the film pack type sealed lead acid battery unit according to the present invention.

In the film pack type sealed lead-acid battery unit of this embodiment, a plurality of electrode plate groups 4 are arranged adjacent to each other, and the flexible conductors 7 of the adjacent electrode plate groups 4 are the same as in the first and second embodiments. And connect all in advance. In this state, the battery case forming films 5 are collectively covered on both surfaces of the electrode plate group 4, and the films 5 facing each other around each electrode plate group 4 are heat-welded at the heat-welding portions 5a. At this time, the connecting portion 10 is also incorporated in the heat-welded portion 5a of the film 5.

When the film pack type sealed lead acid battery unit is manufactured in this manner, mechanization can be introduced very smoothly in mass production, and productivity can be improved.

FIG. 9 shows an exaggerated example of folding the film pack type sealed lead acid battery unit shown in FIG.

[0027]

As described above, the film pack type sealed lead acid battery unit according to the present invention has the flexible conductor in which the connecting portions of the adjacent film pack type sealed lead acid batteries are connected to the respective electrode plates. Since it is formed of a flexible insulator covering the surface of the flexible conductor, it is possible to improve flexibility at the connecting portion. Therefore, there is an advantage that the connecting portion is easily bent, and there is no limitation on the mode of use of the film pack type sealed lead acid battery unit. Further, even if the conductor of the connecting portion is a flexible conductor, the surface of the flexible conductor is covered with a flexible insulator to reinforce, so that the reduction in strength of the flexible conductor can be prevented. Furthermore, since the surface of the conductor of the connecting portion is covered with a flexible insulator,
The occurrence of short circuit can be prevented, and the safety can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of a film pack type sealed lead acid battery unit according to the present invention with an upper film removed.

FIG. 2 is a cross-sectional view of the film pack type sealed lead acid battery unit shown in FIG.

FIG. 3 is a cross-sectional view of essential parts showing a state before connection of a connecting portion in the film pack type sealed lead-acid battery unit shown in FIG.

FIG. 4 is a plan view showing a preferable example of the position of the welded portion in the connection portion of the first embodiment.

5A and 5B are a plan view and a perspective view showing two types of connection ends of a flexible conductor in a connection portion.

6A and 6B are cross-sectional views showing steps of another example of the method of forming the connection portion.

FIG. 7 is a lateral cross-sectional view of a main part of a connecting portion in a second embodiment of the film pack type sealed lead-acid battery unit according to the present invention.

FIG. 8 is a plan view of the third embodiment of the film pack type sealed lead acid battery unit according to the present invention with the upper film removed.

9 is a side view showing a state in which the film pack type sealed lead acid battery unit shown in FIG. 8 is folded.

[Explanation of symbols]

 1 Anode plate 2 Cathode plate 3 Separator 4 Electrode plate group 5 Battery case forming film 5a Heat welding part 6 Film pack type sealed lead acid battery 7 Flexible conductor 8 Welding part 9 Flexible insulator 10 Connection part 11 Safety valve 12 Bending part 13 Flexible Conductor 14 Flexible printed circuit board 15 Soldering part

Claims (1)

[Claims] 1. An electrode plate group is wrapped with a film for forming a battery case,
A plurality of film pack type sealed lead-acid batteries, in which the facing portions of the film around the electrode plate group are hermetically sealed by a heat-sealed portion, are connected by connecting portions between terminals of adjacent electrode plate groups. In the film pack type sealed lead-acid battery unit formed as described above, the connecting portion is formed of a flexible conductor connected to mutual electrode plates and a flexible insulator covering the surface of the flexible conductor. A film pack type sealed lead acid battery unit.