JPH11329375A - Manufacture of sealed type storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a sealed type storage battery that can restrain the moisture permeability of an electrolyte small and can provide a secure sealing property. SOLUTION: A battery container 1 having an opening part in its upper surface is formed from a polypropylene resin, the opening part is oriented downward by inverting the battery container 1, bonding margins 9a, 9b for bonding to a lid in the opening part are dipped into a solution (a) of chlorinated polypropylene for a primer received in a container 15 by the height H of the bonding margins 9a, 9b, the solution (a) is raised to the inside area of the opening part of the battery container 1 by the height H of the bonding margins 9a, 9b by exhausting a part of the air in the battery container 1 through an exhaust pipe 16, and thereafter, the battery container 1 is taken out from the container 15 and then the lid 8 is bonded and mounted to the bonding margins 9a, 9b through an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sealed storage battery in which a battery case is sealed with a lid.

[0002]

2. Description of the Related Art In a conventional sealed storage battery, a battery case and a lid are each formed of ABS resin, and an electrode plate group in which a negative electrode plate, a positive electrode plate, and a separator are sequentially laminated is inserted into the battery case. After this insertion, the lid is adhered to the opening of the battery case via an adhesive, and assembled.

[0003]

When the material of the battery case is made of ABS resin, there is an advantage that the adhesion between the battery case and the lid is good and the sealing of the bonding portion is ensured. The amount of moisture permeation of the electrolytic solution therein becomes very large as compared with the case of a battery case made of polypropylene resin which is generally used in an automobile storage battery. For this reason, it is said that the electrode plate in the battery case has the ability to secure a sufficient capacity, but the amount of electrolyte in the battery decreases early, the battery reaction decreases, and the service life is quickly reached. There's a problem.

On the other hand, in a battery case made of a polypropylene resin having a low moisture permeability of an electrolytic solution, it is difficult to attach a lid to the battery case as it is, and it is necessary to apply a chlorinated polypropylene as a primer beforehand to the adhesion site. Although a treatment is required, if the primer is not sufficiently and stably applied to the bonding portion, a reliable sealing property cannot be obtained.

The present invention has been made in view of such a point. An object of the present invention is to provide a sealed type storage battery which can suppress the moisture permeability of an electrolyte solution and obtain a reliable sealing property. It is to provide a manufacturing method.

[0006]

According to the present invention, in order to achieve the above object, a battery case having an opening on the upper surface is formed of a polypropylene resin, and the battery case is inverted so that the opening is lowered. At the same time, the adhesive margin for bonding to the lid at the opening is immersed in the solution of chlorinated polypropylene as a primer contained in the container by the height of the adhesive margin, and the inside of the battery case is immersed. Part of the air is exhausted to raise the solution to the inner region of the opening of the battery case by the height of the bonding margin.After that, the battery container is taken out of the container, and a lid is attached to the bonding margin. It is designed to be attached by bonding via an adhesive.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sealed storage battery before assembling, and FIG. 2 shows a sealed storage battery after assembling. Reference numeral 1 denotes a battery case formed of a polypropylene resin and having an opening on an upper surface.

The battery case 1 has a plurality of partition walls 2 therein. The partition walls 2 divide the inside of the battery case 1 into three cell chambers 3a, 3a.
b, 3c. At the time of assembling, as shown in FIG. 2, an electrode group 7 formed by sequentially laminating the negative electrode plate 4, the positive electrode plate 5, and the separator 6 is inserted into each of the cell chambers 3a, 3b, 3c. 7 are connected in series.
In some cases, six cell chambers are formed in the battery case 1 depending on the model.

Reference numeral 8 denotes a lid for closing the opening at the upper end of the battery case 1. The cover 8 is made of the same polypropylene resin as the battery case 1 or a resin other than the polypropylene resin, for example, ABS resin, polyethylene resin or the like. When an ABS resin is used as the material of the lid 8, the application of the primer to the lid 8 can be omitted.

The opening edge of the battery case 1 and the upper edge of the partition wall 2 at the height H are adhered to the lid 8 by the margins 9a, 9a.
The adhesive margin 9a at the opening edge of the battery case 1 is formed in a thin state. A slit-shaped fitting groove 10 corresponding to the bonding margin 9a is formed on the lower end surface of the peripheral wall of the lid 8, and a partition wall 11 corresponding to each partition wall 2 of the battery case 1 is formed inside the lid 8. A slit-shaped fitting groove 12 corresponding to the bonding margin 9b is formed on the lower end surface of the partition wall 11 so as to be integrally formed.

The assembling process of the storage battery will be described. First, the battery case 1 is turned upside down so that the opening thereof faces downward, and in this state, the opening of the battery case 1 is housed in a container 15 as shown in FIG. In a solution a of the chlorinated polypropylene as a primer thus obtained, a predetermined depth corresponding to the height H of the margins 9a and 9b is immersed.

At this time, as shown in FIG.
When the opening of the container 1 is simply immersed in the solution a in the container 5, the air trapped in the container 1 pushes down the liquid surface of the solution a facing the opening of the container 1, and , The solution a does not adhere to the side surfaces of the bonding margins 9a and 9b arranged in the opening of the battery case 1.

Therefore, in the present invention, as shown in FIG. 3 (A), as an exhaust means for exhausting the air in the battery case 1, it extends from the bottom of the container 15 and is above the liquid level of the solution a in the container 15. Exhaust pipe 16 is provided.

The exhaust pipe 16 has one main pipe 17 extending from the bottom of the container 15 into the container 15, and the number corresponding to the cell chambers 3 a, 3 b, 3 c of the battery case 1 from this main pipe 17, ie, three. It has branched pipes 18a, 18b, 18c, and the branched pipes 18a, 18b, 18c protrude from the solution a in the container 15 above the liquid level.

When the opening of the battery case 1 is immersed in the solution a in the container 15, each of the cell chambers 3a, 3b,
3c, each corresponding branch pipe 18a, 18b, 18c
To enter.

When the opening of the battery case 1 is immersed in the solution a,
Part of the air in each of the cell chambers 3a, 3b, 3c of the battery case 1 flows out through the exhaust pipe 16, and each of the cell chambers 3a, 3b, 3c.
The inside of c becomes equal to the atmospheric pressure.

The exhaust of the cell chambers 3a, 3b, 3c raises the liquid level of the solution a facing the opening of the container 1, and the liquid level of the solution a on the outer peripheral side of the container 1 The liquid level inside the cell chambers 3a, 3b, and 3c of the battery case 1 is at the same level, so that the inner surface of the bonding margin 9a and both sides of the bonding margin 9b have the same height as the bonding margins 9a and 9b. The solution a is sufficiently adhered and applied by a corresponding amount. Note that an exhaust pump may be provided in the exhaust pipe 16 and the air in the battery case 1 may be forcibly exhausted by the exhaust pump.

When the coating state (coating height) of the primer was measured when the air in each of the cell chambers 3a, 3b, 3c was evacuated and when the air was not evacuated, the results shown in the following Table 1 were obtained. Was.

[0019]

[Table 1]

Thereafter, the battery case 1 is taken out of the container 15, and the electrode plate group 7 is stored in each of the cell chambers 3a, 3b, 3c of the battery case 1. Next, the lid 8 is placed upside down,
An adhesive is poured into each of the fitting grooves 10 and 11 of the lid 8,
Thereafter, the adhesive margin 9a at the opening edge of the battery case 1 and the adhesive margin 9b at each partition wall 2 are inserted into the fitting grooves 10, 12 of the lid 8.
The lid 8 is attached to the opening of the battery case 1 by bonding. Thereby, the battery case 1 and the lid 8 are integrated, and a storage battery having a sealed structure is completed. For this bonding, an epoxy adhesive, a urethane adhesive or the like is used.

As described above, the chlorinated polypropylene as a primer can be sufficiently and stably applied to the portion of the fixed height H on each of the bonding margins 9a and 9b of the battery case 1. The lid 8 is firmly adhered to the opening, so that reliable and stable sealing properties can be obtained.

Since the material of the battery case 1 constituting the storage battery is a polypropylene resin, the amount of moisture permeation of the electrolytic solution can be suppressed to a small value, whereby the service life can be reliably improved.

In order to confirm this, a storage battery of the present invention using a battery case made of polypropylene resin and a lid made of polypropylene resin or a resin other than polypropylene resin, and a battery case made of ABS resin for comparison. And a storage battery using the same was manufactured, and the amount of moisture permeation of the electrolytic solution was measured.

The results of this measurement are shown in Table 2 below. The measurement conditions are as follows: ambient temperature: 60 ° C., specific gravity of electrolyte solution: 1.300, 2.45 V / cell, constant voltage charging.

[0025]

[Table 2] As shown in Table 2, in the storage battery of the present invention in which the material of the battery case is a polypropylene resin, the battery case is A
It can be seen that the amount of moisture permeation of the electrolytic solution is much smaller than that of a conventional storage battery made of BS.

When the container is made of a polypropylene resin, a pretreatment of applying a primer is required at the time of bonding the lid, but if the coating is insufficient, the adhesion of the lid is uncertain and the sealing property is poor. However, in the present invention, the battery case 1
The chlorinated polypropylene as a primer can be sufficiently and stably applied to a predetermined height H on each of the bonding margins 9a and 9b, so that the lid 8 can be securely and firmly bonded to the opening of the battery case 1. Thus, a storage battery having a reliable and stable hermetic structure can be obtained.

[0027]

As described above, according to the present invention, it is possible to manufacture a sealed storage battery having a long service life and a reliable sealing performance by suppressing the moisture permeability of the electrolytic solution.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealed storage battery according to an embodiment of the present invention before assembly.

FIG. 2 is a sectional view of the storage battery after assembly.

FIG. 3 is an explanatory view showing a method of applying a primer to a bonding margin of a battery case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Battery case 2 ... Partition wall 3 ... Cell room 7 ... Electrode plate group 8 ... Lid 9a, 9b ... Adhesion margin 10, 12 ... Fitting groove 15 ... Container 16 ... Exhaust pipe a ... Chlorinated polypropylene solution

Claims (1)

[Claims] A battery case having an opening on the upper surface is formed of polypropylene resin, and the battery case is turned over so that the opening is turned downward, and an adhesive margin for bonding with the lid at the opening is provided. Immersed in a solution of chlorinated polypropylene as a primer contained in the container by the height of the adhesive margin, and evacuated a part of the air in the battery case to remove the inside area of the battery case opening. The sealed type storage battery characterized in that the solution is raised to the portion by the height of the bonding margin, the battery case is then taken out of the container, and a lid is attached to the bonding margin by bonding with an adhesive. Manufacturing method.