JPH11176393A - Sealed lead-acid battery and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed lead-acid battery with no filtrate of electrolyte and less deterioration in life. SOLUTION: Polyphenylene ether based resin is used as material for a battery jar 1 or a battery jar lid 2 for a sealed lead-acid battery. After flame treatment or corona discharge treatment is previously given to a bonded portion between the battery jar 1 and the battery jar lid 2, a bonded portion between the battery jar lid 2 and a positive electrode terminal 11 and a bonded portion between the battery jar lid 2 and a negative electrode terminal 5, epoxy resin based bonding agent is used to bond them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the bonding of a battery case and a battery case cover, and a positive electrode terminal or a negative electrode terminal and a battery case cover used in a sealed lead-acid battery.

[0002]

2. Description of the Related Art Conventionally, acrylonitrile / butadiene / styrene copolymer resin (hereinafter referred to as ABS resin) has been widely used as a material for a battery case and a battery case cover of a sealed lead-acid battery. The battery case using the ABS resin and the battery case cover, and the positive electrode terminal and the negative electrode terminal were bonded to the battery case cover using an epoxy resin adhesive. When an ABS resin is used for a battery case or a battery case cover, and an epoxy resin-based adhesive is used, the bonding portion can be made strong. However, AB
Since S resin has high moisture permeability, there is a problem in that when used as a battery case or battery case cover for a long period of time, the amount of the electrolytic solution is reduced and the life is extended.

Japanese Unexamined Patent Publication (Kokai) No. 6-203 discloses a material for a battery case or a battery case cover which is difficult to transmit moisture and has excellent chemical resistance and impact resistance.
No. 814 proposes the use of a polyphenylene ether-based resin. However, when a polyphenylene ether-based resin is used, there is a problem that it is difficult to adhere with an epoxy resin-based adhesive. If the adhesion between the battery case and the battery case cover and between the positive electrode terminal or the negative electrode terminal and the battery case cover is insufficient, airtightness may not be maintained, peeling may occur, and electrolyte solution may leak. Problems such as liquoring occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a sealed lead-acid battery having high airtightness and little deterioration in life.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the first invention uses a battery containing a polyphenylene ether-based resin as a material for a battery case or a battery case lid of a sealed lead-acid battery. The second invention is characterized in that the surface of the portion of the battery case lid to which the epoxy resin adhesive is to be applied has a larger amount of oxygen-containing functional groups than the surface of the other portion.
The surface of the portion of the battery case or battery case cover containing the polyphenylene ether resin to be coated with the epoxy resin adhesive is subjected to a flame treatment or a corona discharge treatment, and the third invention is a polyphenylene ether-based Using a battery case containing a resin and a battery case lid, applying a flame treatment or a corona discharge treatment to the surface of a portion where the battery case and the battery case cover are bonded, and then bonding them together using an epoxy resin adhesive. Characterized by
The fourth invention uses a battery case lid containing a polyphenylene ether-based resin, and performs a flame treatment or a corona discharge treatment on the surface of the battery case lid side of a portion where the battery case cover and the positive electrode terminal or the negative electrode terminal are bonded. Thereafter, they are bonded to each other using an epoxy resin-based adhesive.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the present invention uses a polyphenylene ether-based resin as a material for a battery case 1 or a battery case cover 2 and uses a surface of a portion to be coated with these epoxy resin-based adhesives. Is preliminarily subjected to a flame treatment or a corona discharge treatment, so that the surface of the portion to be coated has a larger amount of oxygen-containing functional groups than the surface of the other portion. A positive electrode plate 9 having a positive electrode terminal 11, a negative electrode plate 8 having a negative electrode terminal 5, and a retainer 13 containing an electrolytic solution are placed in a battery case 1 which has been subjected to a flame treatment or a corona discharge treatment.
Insert in combination with. And the battery case 1 and the battery case cover 2
An epoxy resin-based adhesive is applied between them, and they are adhered while holding the battery case lid 2 covered. Next, an epoxy resin-based adhesive is filled between the positive electrode terminal 11 and the battery case cover 2 and between the negative electrode terminal 5 and the battery case cover 2 and bonded. By using this method, between the battery case 1 and the battery case cover 2, between the positive electrode terminal 11 and the battery case cover 2, and between the negative electrode terminal 5 and the battery case cover 2
Can be strengthened. In addition,
It has been confirmed by the XPS method that by performing a flame treatment or a corona discharge treatment on the polyphenylene ether-based resin, the amount of a functional group containing oxygen such as a carboxyl group or a carbonyl group on the surface of this portion can be larger than that of other portions. . An embodiment of the present invention will be described below.

[0007]

EXAMPLES (Example) A polymer alloy synthetic resin (trade name: Zylon-240Z, manufactured by Asahi Kasei Corporation) containing a polyphenylene ether resin and a polystyrene resin as main components and a flame retardant added thereto is molded and processed. 1 and battery case lid 2
Was prepared. The oxidizing flame (500 to 1000 ° C.) of a gas burner was applied to the bonded portion of the battery case lid 2 of the battery case 1 for a flame treatment for 0.5 seconds.

An epoxy resin adhesive is filled between the battery case 1 and the battery case cover 2, between the positive electrode terminal 11 and the battery case cover 2, and between the negative electrode terminal 5 and the battery case cover 2, and cured. And glued. This time, a sealed lead-acid battery of 2V-200Ah was prepared, and the tensile strength (peeling strength) between the battery case 1 and the battery case cover 2 was measured. Thereafter, a trickle charge life test was performed at 60 ° C. and a constant voltage of 2.23 V. Then, after 10 months, the container-to-container lid bonding part 3 and the positive electrode terminal-to-container lid bonding part 15
The number of occurrences of leakage of the electrolyte near the negative electrode terminal-container lid adhesion portion 16 and the capacity were measured by discharging at 25 ° C. and 0.25 CA.

Comparative Example 1 As Comparative Example 1, a battery case 1 and a battery case cover 2 not subjected to flame treatment were used. Other raw materials and the method of producing and testing the sealed lead-acid battery are the same as those in the examples.

Comparative Example 2 As Comparative Example 2, a battery case 1 and a battery case lid 2 made of ABS resin were used. Other raw materials and methods for making and testing sealed lead-acid batteries (Example)
Is the same as

Table 1 shows the results of measuring the tensile strength of the bonded portion, the number of leaks generated from the bonded portion, and the discharge capacity of these batteries. When the flame treatment of Example 1 was performed, a tensile strength twice or more was obtained as compared with the case where the flame treatment of Comparative Example 2 was not performed, and this strength was equal to that when the ABS resin of Comparative Example 1 was used. It is about the same. Also,
In Example 1 in which the flame treatment was performed, no leakage of the electrolyte was observed, indicating that the airtightness was improved. In addition, the liquid leaking points in Comparative Example 1 are all from the interface between the adhesive and the battery case 1 or from the interface between the adhesive and the battery case lid 2, and it is considered that the adhesive force at these interface portions is weak. Can be In addition, the product of the present invention is superior in less deterioration in life as compared with Comparative Example 2 using an ABS resin.

[0012]

[Table 1]

In the above embodiment, a polymer alloy synthetic resin mainly composed of polyphenylene ether resin and polystyrene resin and added with a flame retardant was used as a raw material for the battery case 1 or the battery case lid 2 and bonded after flame treatment. Instead of a polystyrene resin, a polymer alloy resin with another synthetic resin such as a polyolefin-based synthetic resin such as polypropylene, or a polyamide-based synthetic resin such as nylon, to which an additive such as a flame retardant or glass flake is added. The same effect can be obtained even when it is included. Similar effects were observed when corona discharge treatment was performed instead of flame treatment.

[0014]

According to the present invention, a battery case or a battery case lid containing a polyphenylene ether-based resin is used, and the surface of the battery case or the battery case lid to be coated with the epoxy resin adhesive is used. It is characterized in that the amount of oxygen-containing functional groups is increased as compared with the surface of other portions. By this means, it is possible to obtain a sealed lead-acid storage battery with less deterioration in life while improving the adhesive strength of the adhesive to a practical level as compared with a case using a battery case or a battery case cover made of ABS resin.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a sealed lead-acid battery.

[Explanation of symbols]

1: battery case, 2: battery case lid, 3: battery case-battery case lid bonding portion,
4: Top cover, 5: negative electrode terminal, 6: negative electrode pole, 7: strap, 8: negative electrode plate, 9: positive electrode plate, 10: positive electrode pole, 11: positive electrode terminal, 13: retainer,
14: Rubber valve, 15: Positive electrode terminal-container lid adhesion part, 16: Negative terminal-container lid adhesion part

Claims (4)

[Claims] In a sealed lead-acid battery using a battery case or a battery case lid containing a polyphenylene ether resin, the surface of the battery case or the battery case cover to which an epoxy resin adhesive is to be applied is covered with another portion. A sealed lead-acid battery characterized by having a greater amount of oxygen-containing functional groups than the surface of the lead-acid battery. 2. The method according to claim 1, wherein the surface of the battery case or the battery case cover to which the epoxy resin adhesive is applied is subjected to a flame treatment or a corona discharge treatment. Sealed lead-acid battery. 3. A battery case containing a polyphenylene ether-based resin and a battery case cover, and a flame treatment or a corona discharge treatment is applied to the surface of a portion where the battery case and the battery case cover are bonded, and then an epoxy resin-based bond is applied. CLAIMS 1. A method for producing a sealed lead-acid battery, comprising: adhering to each other using an agent. 4. A battery case containing a polyphenylene ether-based resin, and a flame treatment or a corona discharge treatment is performed on the surface of the case cover side at a portion where the battery case cover and the positive electrode terminal or the negative electrode terminal are bonded. A method of manufacturing a sealed lead-acid battery, characterized in that the battery is adhered to each other using an epoxy resin-based adhesive.