JPH07183022A - Thin, sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To provide a thin, sealed lead-acid battery having high reliability in a soldered part and capable of using in an environment where temperature change is remarkably large. CONSTITUTION:A plurality of cells 1 are arranged in the flat direction on a circuit board 2. The arranged part of each cell 1 on the circuit board 2 is formed as a space 3 except for the periphery of the cell 1. The periphery of the space 3 on the circuit board 2 is used as a cell supporting frame 2a and a cell-to-cell connecting frame 2b. A cell terminal connecting pattern layer 4a in which cathode cell terminals of the cells 1 are connected with a soldered part 6a and cell terminal connecting pattern layer 4b in which anode cell terminals 1b are connected with a soldered part 6b are installed at a distance of an insulating spacing part 5 in the cell-to-cell connecting frame 2b. A slit 7 which separates the soldered part 6a of the cathode cell terminal 1a from the soldered part 6b of the anode cell terminal 1b is installed in the insulating spacing part 5 in the cell-to-cell connecting frame 2b. By the slit 7, the stress is relaxed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin sealed lead battery.

[0002]

2. Description of the Related Art Conventionally, a thin sealed lead-acid battery has been constructed as an assembled battery by laminating cells in which an electrode plate group consisting of an anode plate, a cathode plate and a separator is sealed with a synthetic resin film or sheet. It was However, in such a structure, there is a problem that the feature of being thin cannot be utilized.

Therefore, a structure of an assembled battery in which cells are arranged in a plane direction and the cells are connected to each other is desired.

However, the thin sealed lead-acid battery having the structure of the assembled battery in which the cells are connected in the plane direction as described above has a problem in the method for connecting the cells.

The simplest connection method between cells is a method of soldering with a vinyl wire or the like. However, in this method, the vinyl wire and the terminal of the cell have to be manually soldered at the time of manufacturing, and the manufacturing line is required. It becomes a big problem of automation.

As one of the methods for solving this problem, a method is used in which cells are connected to each other by using a circuit board in which a cell arrangement portion arranged in a plane direction is cut out and a cell support frame is formed. Is being considered.

The structure of an assembled battery of a conventional thin sealed lead battery incorporating this method will be described with reference to FIGS. 4 and 5. In this thin sealed lead-acid battery, a cell 1 in which an electrode plate group consisting of an anode plate, a cathode plate and a separator is sealed with a synthetic resin film or sheet is arranged on a circuit board 2 in a plane direction, 2 is a space portion 3 in which the arrangement portion of each cell 1 is hollowed out except for the peripheral edge of the cell 1.
Are formed, and the peripheral edges of these spaces 3 are the cell support frame 2a.
And the cell terminal connection pattern layer 4 made of a copper clad layer, which is used as the inter-cell connection frame portion 2b.
a, 4b, 4c are provided with an insulating gap 5 between adjacent ones, and the anode cell terminal 1a of one (left) cell 1 is connected to the cell terminal connection pattern layer 4a by a soldering portion 6a. Cathode cell terminal 1b of cell 1 and the other (right side)
And the anode cell terminal 1a of the cell 1 are connected in series at both ends of the cell terminal connection pattern layer 4b by soldering portions 6b and 6a,
The cathode cell terminal 1b of the other cell 1 is structured to be connected to the cell terminal connection pattern layer 4c by the soldering portion 6b.

In the thin sealed lead-acid battery having such a structure, each cell 1 is placed on the circuit board 2, and the anode cell terminal 1a and the cathode cell terminal 1b of each cell 1 are connected to the cell terminal connection pattern layer 4a. , 4b, or 4c can be easily manufactured by soldering and connecting them to a soldering robot or the like.

[0009]

However, in such a conventional thin sealed lead battery, the inter-cell connection frame portion 2b is used.
There is a problem in the reliability of the soldering portions 6a and 6b in the above. The problem is that when used in an environment where the temperature changes drastically, such as in a solar cell system, there is a possibility that conduction failure may occur early.

To confirm this, as shown in FIGS. 4 and 5, the anode cell terminal 1a and the cathode cell terminal 1 of the cell 1 are shown.
b is the cell terminal connection pattern layers 4a, 4 of the circuit board 2
A thin sealed lead battery composed of an assembled battery soldered to either b or 4c and a thin sealed lead battery composed of an assembled battery in which cells are connected by a normal vinyl wire are exposed to high temperature. A heat shock test was conducted in which the low temperature was repeated for a certain period of time. As a result, the latter thin sealed lead-acid battery, which consists of assembled cells in which cells are connected by a vinyl wire, can be cycled between high and low temperatures.
There was no abnormality in the soldering part even after repeating 00 cycles, but in the case of the thin sealed lead-acid battery consisting of the assembled battery in which the cells were connected using the former circuit board 2, the soldering part was found after 100 cycles. A crack was formed on the surface, and it completely broke after 400 cycles, resulting in poor continuity.

The cause of this is the coefficient of thermal expansion of the inter-cell connecting frame portion 2b in the insulating gap portion 5 between the anode cell terminal 1a and the cathode cell terminal 1b, and the cell terminal connecting pattern layers 4a, 4.
It is considered that since the thermal expansion coefficient of the inter-cell connection frame portion 2b in b and 4c was different, stress was applied to the soldering portions 6a and 6b, which resulted in fracture. The reason why no breakage occurred in the thin sealed lead-acid battery consisting of the assembled battery in which the cells were connected by the vinyl wire is considered that the vinyl wire was soft and absorbed the stress.

An object of the present invention is to provide a thin sealed lead battery which has a highly reliable soldered portion and can be used even in an environment where the temperature changes drastically.

[0013]

The constitution of the present invention which achieves the above object will be described as follows.

According to a first aspect of the present invention, cells in which an electrode plate group is sealed with a synthetic resin film or sheet are arranged in a plane direction on a circuit board, and the circuit board is arranged such that each cell arrangement portion is the cell. Is a space except for the periphery of the cell, and the periphery of these spaces is used as the cell supporting frame and the inter-cell connecting frame, and the inter-cell connecting frame is connected to the anode cell terminal of the cell by soldering. In a thin sealed lead-acid battery having an assembled battery structure in which a cell terminal connection pattern layer soldered and connected with a cathode cell terminal and a cell terminal connection pattern layer soldered and connected with a soldering portion are provided with an insulation gap. A slit that separates the soldering portion of the anode cell terminal of the cell from the soldering portion of the cathode cell terminal of the cell is provided in the insulating gap portion in the inter-cell connection frame portion. Special To.

According to a second aspect of the present invention, cells in which the electrode plate group is sealed with a synthetic resin film or sheet are arranged in a plane direction on a circuit board, and the circuit board has portions where the cells are arranged. Is a space except for the periphery of the cell, and the periphery of these spaces is used as the cell supporting frame and the inter-cell connecting frame, and the inter-cell connecting frame is connected to the anode cell terminal of the cell by soldering. In a thin sealed lead-acid battery having an assembled battery structure in which a cell terminal connection pattern layer soldered and connected with a cathode cell terminal and a cell terminal connection pattern layer soldered and connected with a soldering portion are provided with an insulation gap. A slit for separating the soldering portion of the anode cell terminal of the cell and the soldering portion of the cathode cell terminal of the cell is provided in the insulating gap portion in the inter-cell connection frame portion, Indirect On both sides in the width direction of the frame portion and a space portion of larger area than the slits are respectively provided in boxes portion of the circuit board.

[0016]

According to the first aspect of the present invention, a slit for separating the soldering portion of the anode cell terminal of the cell from the soldering portion of the cathode cell terminal of the cell is provided in the insulating gap portion in the inter-cell connection frame portion. Then, the stress applied to each soldered portion is relieved by the existence of the slit, and the reliability of the soldered portion can be improved. Therefore, according to the present invention, it is possible to obtain a thin sealed lead battery in which the reliability of each soldered portion is improved.

According to a second aspect of the present invention, the inter-cell connecting frame portion is slit when the space portions having a larger area than the slit are provided on both sides in the width direction of the inter-cell connecting frame portion by surrounding the frame portion of the circuit board. Even if separated by, it is possible to prevent deterioration of mechanical strength.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIG. 4 described above are denoted by the same reference numerals.

FIG. 1 shows a first embodiment of a thin sealed lead battery according to the present invention. The present embodiment shows an example of a thin sealed lead-acid battery using two cells 1. In the present embodiment, cells 1 are arranged on the left and right in the plane direction on the circuit board 2, and the arrangement portion of each cell 1 on the circuit board 2 is hollowed out except the peripheral edge of the cell 1 to form a space 3
And the peripheral edges of these spaces 3 are the cell support frame 2
a and the inter-cell connection frame portion 2b. In the inter-cell connection frame portion 2b, cell terminal connection pattern layers 4a, 4b, 4c made of a copper clad layer are provided between the adjacent insulating spaces 5a.
The anode cell terminal 1a of the cell 1 on one side (left side) is provided on the cell terminal connection pattern layer 4a with a soldering portion 6a.
The cathode cell terminal 1b of the one cell 1 and the anode cell terminal 1a of the other (right) cell 1 are connected in series at both ends of the cell terminal connection pattern layer 4b by soldering portions 6b and 6a, and The cathode cell terminal 1b of the cell 1 is connected to the cell terminal connection pattern layer 4c by the soldering portion 6b.

Insulating gap portion 5 in the cell connecting frame portion 2b
Includes a soldering portion 6a of the anode cell terminal 1a of the cell 1, and
A slit 7 is provided to separate the cathode cell terminal 1b of the cell 1 from the soldering portion 6b.

Further, on both sides in the width direction of the inter-cell connection frame portion 2b, space portions 3 and 8 having a larger area than the slit 7 are provided surrounded by the frame portion 2a.

As described above, the anode cell terminal 1 of the cell 1 is placed in the insulating gap portion 5 of the inter-cell connection frame portion 2b of the circuit board 2.
When the slit 7 for separating the soldering portion 6a of a from the soldering portion 6b of the cathode cell terminal 1b of the cell 1 is provided, the stress applied to each soldering portion 6a, 6b is relaxed by the existence of the slit 7. The reliability of the soldered part can be improved. Therefore, according to the present invention, each soldering portion 6a,
It is possible to obtain a thin sealed lead battery having improved reliability of 6b.

Further, when the space portions 3 and 8 having an area larger than the slit 7 are provided on both sides in the width direction of the inter-cell connection frame portion 2b so as to be surrounded by the frame portion 2a of the circuit board 2, the inter-cell connection frame portion 2b.
Even if the slits are separated by the slit 7, the mechanical strength can be prevented from lowering.

FIG. 2 shows a second embodiment of the thin sealed lead battery according to the present invention. This embodiment shows another example of a thin sealed lead-acid battery using two cells 1. In this embodiment, the cells 1 are arranged above and below in the plane direction on the circuit board 2, and the arrangement portion of each cell 1 is hollowed out on the circuit board 2 except for the peripheral edge of the cell 1 and the space 3 is formed.
And the peripheral edges of these spaces 3 are the cell support frame 2
a and the inter-cell connection frame portion 2b. In the inter-cell connection frame portion 2b, cell terminal connection pattern layers 4a, 4b, 4c made of a copper clad layer are provided between the adjacent insulating spaces 5a.
The anode cell terminal 1a of one (lower) cell 1 is provided on the cell terminal connection pattern layer 4a with a soldering portion 6a.
The cathode cell terminal 1b of the cell 1 on one side and the anode cell terminal 1a of the cell 1 on the other side (upper side) are connected in series at both ends of the cell terminal connection pattern layer 4b by soldering portions 6b and 6a. The cathode cell terminal 1b of the cell 1 is connected to the cell terminal connection pattern layer 4c by the soldering portion 6b.

Also in this embodiment, the inter-cell connection frame portion 2
In the insulating gap portion 5 in b, the anode cell terminal 1 of the cell 1 is
A slit 7 for separating the soldering portion 6a of a from the soldering portion 6b of the cathode cell terminal 1b of the cell 1 is provided.

On both sides in the width direction of each inter-cell connection frame portion 2b, space portions 3 and 3 having a larger area than the slit 7 are provided surrounded by the frame portion 2a.

With such a structure, the same effect as that of the first embodiment can be obtained. When the cells 1 are arranged above and below in the plane direction of the circuit board 2 as in the present embodiment, the inter-cell connection frame portion 2b is shared by the cells 1, and as a result, the inter-cell connection frame portion 2b is reduced by one. Therefore, the structure can be downsized.

FIG. 3 shows a third embodiment of the thin sealed lead-acid battery according to the present invention. This embodiment shows an example of a thin sealed lead battery in which twelve cells 1 are arranged in the plane direction of a circuit board 2. This embodiment shows an example in which the structure of the second embodiment is applied to these paired cells 1 because there are 6 pairs of cells 1 which are paired up and down.

In this embodiment, the cell terminal connection pattern layer 4c connected to the cathode cell terminal 1b of the lower cell 1 of the upper paired cells 1 and the lower paired cell 1 are connected. The cell terminal connection pattern layer 4a connected to the anode cell terminal 1a of the upper cell 1 is connected to each other on the cell support frame portion 2a. Therefore, four cells 1 arranged in the vertical direction are connected in series.

Further, the cell terminal connection pattern layers 4a connected to the respective anode cell terminals 1a of the uppermost three cells 1 are connected to each other on the cell support frame portion 2a at the upper end. Similarly, the cell terminal connection pattern layers 4c connected to the respective cathode cell terminals 1b of the bottom three cells 1 are connected to each other on the cell support frame portion 2a at the lower end.

As a result of performing a heat shock test for a fixed time at high temperature and low temperature on the thin sealed lead batteries shown in FIGS. 1, 2 and 3, thin sealed lead cells were connected by vinyl wires between cells. Like the battery, even after 2000 cycles, the soldering part 6
No fracture occurred in a and 6b.

The slit 7 may be provided before assembling or punched after soldering.

[0033]

As described above, according to the thin sealed lead battery of the present invention, the following excellent effects can be obtained.

According to the first aspect of the invention, a slit for separating the soldering portion of the anode cell terminal of the cell and the soldering portion of the cathode cell terminal of the cell is provided in the insulating gap portion in the inter-cell connection frame portion. Therefore, the stress applied to each soldering portion is relieved by the existence of the slit, and the reliability of the soldering portion can be improved even when the soldering portion is used in an environment where the temperature changes drastically such as a solar cell system. Therefore, according to the present invention, it is possible to obtain a thin sealed lead battery in which the reliability of each soldered portion is improved.

According to the second aspect of the present invention, the space portions having a larger area than the slits are provided on both sides in the width direction of the inter-cell connection frame portion so as to be surrounded by the frame portion of the circuit board. Even if they are separated by slits, it is possible to prevent a decrease in mechanical strength.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of a thin sealed lead battery according to the present invention.

FIG. 2 is a plan view of a thin sealed lead battery according to a second embodiment of the present invention.

FIG. 3 is a plan view of a third embodiment of the thin sealed lead battery according to the present invention.

FIG. 4 is a plan view of a conventional thin sealed lead battery.

5 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cell 1a Anode cell terminal 1b Cathode cell terminal 2 Circuit board 2a Cell support frame part 2b Cell connection frame part 3 Space part 4a, 4b, 4c Cell terminal connection pattern layer 5 Insulation space part 6b, 6a Soldering part 7 Slit 8 Space section

Claims (2)

[Claims] 1. A cell in which an electrode plate group is sealed with a film or sheet of a synthetic resin body is arranged in a plane direction on a circuit board, and the circuit board has a space portion except for the peripheral edge of the cell. The periphery of these spaces is used as a cell supporting frame and an inter-cell connecting frame, and the inter-cell connecting frame is a cell terminal in which the anode cell terminal of the cell is soldered and connected by a soldering section. A thin sealed lead-acid battery having an assembled battery structure in which a connection pattern layer and a cell terminal connection pattern layer in which a cathode cell terminal is connected by soldering at a soldering portion are provided with an insulation gap provided therebetween, wherein the inter-cell connection frame portion is provided. A thin hermetic seal characterized in that a slit for separating the soldering portion of the anode cell terminal of the cell from the soldering portion of the cathode cell terminal of the cell is provided in the insulating gap portion in Lead wire . 2. A cell in which an electrode plate group is sealed with a synthetic resin film or sheet is arranged in a plane direction on a circuit board, and in the circuit board, a disposing portion of each cell is a space except a peripheral edge of the cell. The periphery of these spaces is used as a cell supporting frame and an inter-cell connecting frame, and the inter-cell connecting frame is a cell terminal in which the anode cell terminal of the cell is soldered and connected by a soldering section. A thin sealed lead-acid battery having an assembled battery structure in which a connection pattern layer and a cell terminal connection pattern layer in which a cathode cell terminal is connected by soldering at a soldering portion are provided with an insulation gap provided therebetween, wherein the inter-cell connection frame portion is provided. In the insulating gap portion, a slit for separating the soldering portion of the anode cell terminal of the cell and the soldering portion of the cathode cell terminal of the cell is provided, and the width direction of the inter-cell connection frame portion On both sides of Thin sealed lead battery and a space portion is provided each surrounded by a frame portion of the circuit board of larger area than the slits.