JP2000200620A - Sealed lead-acid battery and manufacturing method thereof - Google Patents

Abstract

(57) [Problem] To reduce variation in discharge capacity between cells of a sealed lead-acid battery and prolong its life. An opening 1 is provided in a lid 8 of a monoblock type sealed lead-acid battery. Then, at the time of forming the battery case, the cooling pipe 2 is inserted from the opening 1 of the lid 8 and the cooling water flows inside the cooling pipe 2, thereby suppressing the temperature variation between the cells. After formation of the battery case, the valve unit structure 4 on which the upper lid 5 and the safety valve 6 are mounted is welded to the opening 1 of the lid 8 and sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead-acid battery and a method for manufacturing the same.

[0002]

2. Description of the Related Art The battery case formation step is the final step in the manufacture of a sealed lead-acid battery, and is a very important step for determining the charge / discharge characteristics and life characteristics. 2. Description of the Related Art A conventional monoblock sealed lead storage battery has a shape as shown in FIG. 2 as an example, and is manufactured by the following method. That is, a large number of unformed paste-type electrode plates are laminated via a separator to assemble an electrode group (not shown). The electrode group is inserted into the battery case 3, the cells are welded and connected, and the lid 8 and the battery case 3 are welded. An electrolytic solution is injected from an exhaust port 7 provided in the lid 8 and formed into a battery case in a state of being immersed in a water tank filled with water. And the battery case
The electrolyte liberated from the electrodes and separators in 3 can be exhausted by turning the sealed lead-acid battery
After covering the exhaust port 7 with a cap-shaped safety valve 6, the upper lid 5 is thermally welded to the lid 8 to produce a sealed lead-acid battery.

[0003] However, although the above-mentioned monoblock sealed lead-acid battery is formed in a battery case in a state of being immersed in a water tank filled with water, the temperature rises due to heat generated by charging. It is known that an excessive rise in the temperature of the sealed lead-acid battery during formation of the battery case adversely affects the charge / discharge characteristics and the life characteristics. When the conventional method of forming a battery case in a state of being immersed in a water tank filled with water is used, there is a problem that the variation in the battery temperature of each cell becomes large.
In particular, in FIG. 2, the center cell (No (3) or No (4) cell) tends to become hotter than the cells at both ends (No (1) or No (6) cell). Means for lowering the temperature of the water tank is effective in keeping the temperature of the battery low during battery case formation. However, when this method is used, although the battery temperature of each cell of the monoblock sealed lead-acid battery becomes low as a whole, there is a problem that the variation in the temperature of each cell cannot be suppressed yet. . As means for suppressing the battery temperature during battery case formation, there is a means for reducing the charging current value. However, when this method is used, it is necessary to lengthen the battery forming time in order to charge a fixed amount of electricity required for battery forming to the sealed lead-acid battery. Is reduced.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the temperature variation between cells of a sealed lead-acid battery during battery case formation, thereby achieving a conventional sealed-type lead-acid battery having a long life with a battery case formation time. It is to provide.

[0005]

According to a first aspect of the present invention, there is provided a sealed lead-acid battery formed by a battery case having a plurality of cells and a lid, wherein the lid is provided for each cell. Each valve has an opening, and the opening is hermetically sealed by mounting a valve structure, and the valve structure has a built-in exhaust port and a safety valve.

In the second invention, an electrode group is inserted into each cell of a battery case having a plurality of cells, the cells are welded and connected in series, and a lid provided with an opening is connected to the battery case. Weld and inject the electrolyte from the opening, then insert a cooling pipe from the opening to form a battery case while cooling, and remove the electrolyte solution released into the battery case after the formation of the battery case. After that, a valve section structure is attached to the opening of the lid to hermetically seal.

[0007]

FIG. 1 shows an embodiment according to the present invention. The sealed lead-acid battery of the present invention has an opening 1 for inserting the cooling pipe 2 into the lid 8. The opening 1 has a diameter larger than that of the exhaust port 7, and the injection of the electrolytic solution is easy.
After the electrolyte is injected, the cooling pipe 2 is connected to the opening 1 of the lid 8.
, And form a battery case in the conventional state. In addition, cooling pipe
2 can flow cooling water as shown in FIG. Then, after forming the battery case, take out the cooling pipe 2 from the battery case 3 and open the opening.
A valve structure 4 having an upper lid 5 and a safety valve 6 is attached to 1 to produce a sealed lead-acid battery.

[0008]

Embodiments of the present invention will be described below.

(Embodiment) An electrode plate group including an untreated positive electrode plate, a negative electrode plate, and a retainer is manufactured. A sealed lead-acid battery having a 6-cell in-line structure is assembled under the conventional conditions using the electrode group, and an electrolyte is injected from the opening 1 to assemble the battery. 30 ± 5
In a state in which the sealed lead-acid battery is immersed in a water tank at a temperature of 30 ° C., a cooling water of 30 ± 5 ° C. is passed through the cooling pipe 2 for each cell as shown in FIG. went. After the formation of the battery case, the cooling pipe 2 is taken out and the valve structure is inserted into the opening 1.
4 was welded to produce a sealed lead-acid battery of 38Ah-12V.

(Comparative Example) As a (Comparative Example), a sealed lead-acid battery was manufactured by forming a battery case in a water tank at 25 ± 5 ° C. which has been conventionally used. Table 1 shows the results of battery case formation (Example).
And (Comparative Example) show the maximum temperature of each cell. Cell Nos. (1) and No. (6) correspond to the end cells, and cell No.
(3) and No (4) correspond to the central cell. In Comparative Example, the temperature difference between the end cell and the center cell was about 10 ° C. On the other hand, in (Example) of the present invention, the difference between them is within about 2 ° C., and the temperature variation is smaller than that in (Comparative Example).

Next, a discharge test was performed for each of these sealed lead-acid batteries. The test conditions were 1 at a discharge current of 9.5A.
Discharge was performed until the voltage reached 0.2 V, and the results are shown in Table 1.
It can be seen that (Example) has a smaller variation in discharge time than (Comparative Example).

[0012]

[Table 1]

A cycle life test was performed on these sealed lead-acid batteries. The test conditions were as follows: the ambient temperature was 25 ° C., and the charge and discharge were repeated at 9.5 A for 2 hours and at 3.8 A for 6 hours. The results are shown in FIG. It can be seen that (Example) using the present invention has a longer cycle life than (Comparative Example). In the present embodiment, the valve structure 4 is attached to the lid 8 by welding.
A method in which the lid 4 and the lid 8 are bonded using an adhesive may be used. In addition, a female screw may be cut into the lid 8 and a male screw may be cut into the valve unit structure 4, and the cover 8 may be mounted using a screwing method.

[0014]

As described above, when the present invention is used, the capacity variation of each cell is small, and the life of the sealed lead-acid battery can be extended. Also, the lid 8 before the valve structure 4 is attached
Of the opening 1 of the conventional sealed lead-acid battery
Since it is larger, the injection and discharge of the electrolyte and the insertion of the cooling pipe 2 can be easily performed. When the size of the exhaust port 1 is changed, the characteristics of the safety valve mechanism change. Therefore, it can be used even when it is not desired to change the characteristics from the conventional one.

[Brief description of the drawings]

FIG. 1 is a schematic view of a sealed lead-acid battery of the present invention.

FIG. 2 is a schematic view of a conventional sealed lead-acid battery.

FIG. 3 shows a cycle life test result.

[Explanation of symbols]

1: Opening, 2: Cooling pipe, 3: Battery case, 4: Valve structure, 5: Top lid, 6: Safety valve, 7: Exhaust port, 8: Lid, 9: Terminal.

Claims (2)

[Claims] 1. A sealed lead-acid battery formed of a battery case having a plurality of cells and a lid, wherein the lid has an opening for each cell, and the opening is provided with a valve structure. A sealed lead-acid battery, wherein the valve structure has a built-in exhaust port and a safety valve. 2. An electrode group is inserted into each cell of a battery case having a plurality of cells, the cells are welded to each other and connected in series, and a lid provided with an opening is welded to the battery case. Injecting the electrolyte from the opening, then forming a battery case while cooling by inserting a cooling pipe from the opening, after removing the electrolyte solution released in the battery container after the battery case formation, A method for manufacturing a sealed lead-acid battery, wherein a valve structure is attached to an opening of a lid to seal the lid.