JPS62157674A - Manufacture of sealed lead storage battery - Google Patents

Abstract

PURPOSE:To improve the discharge characteristic while making the size small and the eight light, by forcing electrode plates into a battery jar in the condition where the remaining heat temperature of welding is higher than the softening temperature of a battery jar material, and press-fitting a shelf portion, which is formed by integratedly welding the space of cells with lead, to a partition wall, thereby forming a sealing portion because of the weld of the partition wall material. CONSTITUTION:Electrode plates 5 are forced into a battery jar 1 to a specific height and shelves 6, 10 are formed by welding. Next, in the condition where the remaining heat temperature of welding is higher than the softening temperature of a battery jar material, the electrode plates in plural cells are simultaneously forced into the battery jar 1, thereby the shelf 6 is press-fitted in a partition wall. Then, the partition wall material is welded by said press-fitting so as to form a sealing portion 11. Therefore, the structure of the battery is simplified and it is possible to make the size small and the weight light. Further, the inner resistance become lower so that the discharge characteristic can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a power source for electronic equipment such as a video tape recorder,
The present invention also relates to a method for manufacturing a sealed lead-acid battery used as a power source for emergency lights and the like.

(Prior Art) In recent years, with the development of electronic devices, the sealed lead-acid batteries that serve as their power sources have also been required to be smaller and lighter. In order to make batteries smaller and lighter, it is first necessary to simplify the structure, reduce the number of parts, especially the number of lead parts, and minimize unnecessary dead space.

FIG. 5 is a sectional view of a conventional sealed lead-acid battery, and FIG. 6 is a sectional view taken along line BB' in FIG. In the figure, 1 is a battery case, 2 is an inner lid, 3 is an upper lid that holds down a safety valve 4, 5 is a group of electrode plates made by stacking positive and negative electrode plates and separators, 6 is a shelf with welded ears, and 7 is a An inter-cell connection body, 8 is an inter-cell sealing resin, and 9 is a terminal.

The sealed lead-acid battery constructed as described above is produced by welding the ears of the electrode plate group 5, which is made up of alternating layers of positive electrode plates, negative electrode plates, and separators, to form the shelf portion 6, and at the same time welding the connecting body 7. This is pushed into the battery case 1, and the connecting bodies 7 between the cells are welded together. Next, pour the sealing resin 8 into the connecting body 7 and insert the inner lid 2.
were attached by heat welding to seal each cell.

(Problems to be Solved by the Invention) In the above-mentioned conventional configuration, the mold for pouring the resin needs to fit inside the battery case, and the connecting body cannot be made short. In addition, if a structure is adopted in which cells are connected directly at the shelf section described later, the structure of the part where the sealing resin is poured becomes complicated, which complicates the pouring mold. had the disadvantage of poor reliability.

An object of the present invention is to provide a method for manufacturing a sealed lead-acid battery, which eliminates the conventional drawbacks, realizes reduction in size and weight, and improves high-rate discharge characteristics.

(Means for Solving the Problems) The method for manufacturing a sealed lead-acid battery of the present invention uses, as a connecting body, a shelf portion welded together with lead or lead alloy between cells of a plurality of cells, and The electrode plate group is pushed into the battery case while the residual heat temperature of welding is higher than the softening temperature of the battery case material, and the residual heat of the connecting body melts the partition walls and press-fits them, thereby sealing between the cells.

(Function) By the above method, the structure of the battery can be simplified, the manufacturing process can be simplified, and the battery can be made smaller and lighter. Furthermore, since the cells are directly connected through the shelves, internal resistance is lowered, and high rate discharge characteristics can also be improved.

(Example) An example of the present invention will be described based on FIGS. 1 to 4. In this figure, the same reference numerals are given to the parts having the same structure as those of the conventional example shown in FIGS. 5 and 6, and the explanation thereof will be omitted.

FIG. 1 is a sectional view of a sealed lead-acid battery according to the method of the present invention, and FIG. 2 is a sectional view taken along line AA' in FIG.

In FIGS. 1 and 2, 10 is a shelf section that is integrally formed by performing edge welding on the adjacent cell at the same time as a connecting body, 11 is a partition wall that is melted by the heat of the shelf section 10 and used as a sealing section, and 12 is a positive electrode. board, 1
3 is a separator, and 14 is a negative electrode plate.

Note that polypropylene was used as the material for the battery case 1, inner lid 2, and upper lid 3.

A manufacturing method for the sealed lead-acid battery configured as described above will be described.

First, as shown in FIG.
formed by welding. The temperature of the shelf 6 immediately after welding is approximately 250
℃, which was about 85℃ higher than the softening temperature of polypropylene, which is the container material used, at 165℃.

Next, by pushing three cells of the electrode plate group 5 into the battery case 1 at the same time, the shelf portion 6 with residual heat from welding was press-fitted into the partition wall. The partition wall material was melted by press-fitting to form a sealing portion 11 . The residual heat temperature of the shelf 10 at an outside temperature of 25°C is approximately 250°C immediately after welding, approximately 180°C after 10 seconds, and approximately 1°C after 20 seconds.
The temperature was changed to 50° C., and the time during which the shelf portion 10 in this example could be press-fitted into the partition wall and sealed was experimentally determined to be between 5 seconds and 15 seconds.

Next, the inner lid 2 was attached by heat welding, and the battery was then assembled in a conventional manner.

In this example, 100 batteries of the present invention were assembled, and the airtightness of the shelf section 10 and the sealing section 11 was tested using air pressure, and it was found that the airtightness of all the batteries was sufficiently determined. In addition,
Compared to conventional batteries, the battery according to the method of the present invention has a connection body 7
By omitting this, the volume could be reduced by about 10% and the weight by 5%.

Next, internal measurements of the sealed lead-acid battery manufactured and configured as described above were performed to examine the discharge characteristics. First, the internal resistance is approximately 19 mΩ on average for 100 pieces using conventional connectors.
On the other hand, the battery of the present invention had an average resistance of 16 mΩ, and was able to lower the internal resistance by about 15%. The discharge characteristics due to this reduction in internal resistance are shown in FIG. In the same figure, 15.16 are each 0.250 according to the conventional battery structure.
(A), IC (A) discharge curve, 17.18 is 0,25C (A) according to the battery structure of the present invention.

1c (A) is a discharge curve (C is the nominal capacity). As can be seen from FIG. 4, the battery of the present invention had no voltage drop due to discharge, and this tendency was particularly remarkable during high rate discharge, and the discharge characteristics were improved.

(Effects of the Invention) According to the present invention, a shelf portion welded together with lead or lead alloy between cells of a plurality of cells is used as a connecting body, and the residual heat temperature of this connecting body is higher than the softening temperature of the battery case material. By pressing the electrode plate group into the battery case and sealing between the cells by melting the partition wall with the residual heat of the connection body and press-fitting it, the manufacturing process is simplified and the size and weight can be reduced.
This has the effect of realizing an excellent sealed lead-acid battery that also improves high-rate discharge characteristics.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a sealed lead-acid battery according to the method of the present invention;
FIG. 2 is a sectional view taken along line AA' in FIG. 1, FIG. 3 is a sectional view showing the manufacturing process of a sealed lead acid battery according to the present invention,
The figures are discharge curve diagrams of sealed lead-acid batteries according to a conventional example and the method of the present invention, FIG. 5 is a sectional view of a conventional sealed lead-acid battery, and FIG. 6 is a sectional view taken along line BB' in FIG. 1...Battery case, 2...Inner lid, 3...Top lid. 4...safety valve, 5...electrode plate group, 6゜1
0...Shelf part, 7...Inter-cell connection body, 8...
Intercell sealing resin, 9...terminal, 11...partition wall,
12...Positive electrode plate, 13...Separator, 14...
Negative electrode plate, 15, 16, 17.18...discharge curve. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A shelf section welded together with lead or lead alloy between the cells of a plurality of cells is used as a connection body, and the electrode plate group is attached to the battery case in a state where the residual heat temperature of the welding of the connection body is higher than the softening temperature of the battery case material. A method for manufacturing a sealed lead-acid battery, characterized in that the cells are sealed by pressing, melting the partition wall with residual heat of the connecting body, and press-fitting.