JPH11273659A - Sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the occurrence of external appearance failure due to a short circuit and green rust, to reduce a cost, and to improve productivity by covering a part of the surfaces of tab terminals with an insulating material. SOLUTION: A layer of an insulating material 5 is formed by applying and hardening an upper surface two-liquid epoxy resin adhesive of a positive electrode tab terminal 3 and a negative electrode tab terminal by a spatula. A red pigment is premixed with a main agent and is used as a main agent of a two-liquid epoxy resin adhesive applied to the positive electrode tab terminal 3 so that polarity can be displayed, and a black pigment is premixed with a main agent and is used as a main agent of a two-liquid epoxy resin adhesive applied to the negative electrode tab terminal. Corrosion at initial charging time and a short circuit at work time to be incorporated into an uninterruptive power supply are not recognized in a sealed lead-acid battery by such constitution. The same sealant filling machine can be make shift with a single unit by displaying polarity of the terminals to reduce an equipment cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery using a tab terminal for a positive terminal or a negative terminal, such as a sealed lead storage battery.

[0002]

2. Description of the Related Art As shown in FIG. 3, a small sealed battery has a structure in which a battery lid 2 is welded or bonded to a battery case 1 containing a power generating element. Then, the positive electrode tab terminal 3 and the negative electrode tab terminal 4 are connected to the positive electrode sealing agent 6 or the negative electrode sealing agent 7.
And is adhered and fixed to the battery cover 2. Most of these tab terminals are made of brass (brass).
The surface is generally plated with nickel or tin. However, when these tab terminals are used, there is a risk that a short circuit may occur. That is, in the work of incorporating these batteries into an electric device such as an uninterruptible power supply, the positive electrode tab terminal 3 and the negative electrode tab terminal 4 are short-circuited due to accidental contact with a tool such as a driver or a metal part such as a lead wire. May be. In such a case, since a large current flows in the short-circuited portion, melting / damage due to heat generation occurs, which may result in poor appearance.

Further, since the same tab is used for the positive electrode tab terminal 3 and the negative electrode tab terminal 4, they cannot be distinguished. Therefore, conventionally, the difference between the positive electrode tab terminal 3 and the negative electrode tab terminal 4 has been clarified by changing the colors of the positive electrode sealing agent 6 and the negative electrode sealing agent 7. That is, conventionally, in order to indicate the polarity of the positive electrode tab terminal 3 or the negative electrode tab terminal 4, the positive electrode sealing agent 6 and the negative electrode sealing agent 7, which are colored in different colors, are used. Therefore, in the conventional method, at least two sealing agent injection machines are required in total, and there are problems that the equipment cost is high and that the respective steps cannot be performed by the same equipment, so that the productivity is poor. Furthermore, it was often observed that dilute sulfuric acid or its mist adhered to the upper surface of the positive electrode tab terminal 3 or the negative electrode tab terminal 4 at the time of injecting the electrolytic solution or at the time of the initial charge, causing patina and rust, resulting in poor appearance.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a sealed type having a positive electrode tab terminal 3 or a negative electrode tab terminal 4 which is less likely to have a poor appearance due to a short circuit or green and blue rust, has low production equipment cost, and has excellent productivity. It aims to provide batteries.

[0005]

To solve the above-mentioned problems, in a sealed battery using a tab terminal for at least one of a positive terminal and a negative terminal, in the first invention, a part of the surface of the tab terminal is insulated. The surface of the other tab terminal is not covered with an insulator, and the second invention is characterized in that the upper surface of the tab terminal is covered with an insulator. . In the third invention,
The positive electrode terminal or the negative electrode terminal is characterized by being colored by coloring the insulator used in the first invention or the second invention described above, and in the fourth invention, the insulator has acid resistance It is characterized by being made of an epoxy resin. Note that, depending on the sealed battery, the tab terminal may be used as either the positive electrode or the negative electrode. Further, in some cases, a part of one of the tab terminals of the positive electrode and the negative electrode is coated as an insulator. In addition, one of the insulators of the tab terminal used for the positive electrode or the negative electrode may be colored.

[0006]

An embodiment of the present invention will be described below. 12
A total of 2000 V-7Ah sealed lead-acid batteries were assembled in a conventional manner. Of the 2000 batteries produced, 100
For zero batteries, as shown in FIG.
And a two-part epoxy resin adhesive (main component: bisphenol F type epoxy resin, curing agent: modified polyamine curing agent, mixing weight ratio) on the upper surface of the negative electrode tab terminal 4 (only the case of the positive electrode tab terminal 3 is described in FIG. 1). Is the main agent: curing agent = 100: 4
7, curing conditions: 60 ° C., 40 minutes), and a layer of the insulator 5 was formed by curing, thereby obtaining a product of the present invention. In order to display the polarity, the main component of the two-component epoxy resin adhesive applied to the positive electrode tab terminal 3 is preliminarily mixed with a red pigment, and the two-component epoxy resin applied to the negative electrode tab terminal 4 is used. As a main component of the resin adhesive, a black pigment was previously mixed with the main component and used. On the other hand, as a comparative example, 1000 batteries in which both the positive electrode tab terminal 3 and the negative electrode tab terminal 4 were not insulated by the above-described means were used.

After these two types of batteries were initially charged by the conventional procedure, the appearances of the positive electrode tab terminal 3 and the negative electrode tab terminal 4 were inspected. As a result, as shown in Table 1, in the comparative example, 1
Corrosion was observed in the positive electrode tab terminal 3 or the negative electrode tab terminal 4 of the two batteries, but no corrosion was observed in the product of the present invention. Thereafter, the work of incorporating these batteries into 100 uninterruptible power supplies (using 10 batteries in one uninterruptible power supply) was performed. Then, the number of occurrences of short circuits caused by accidental contact with tools such as drivers and metal parts such as lead wires during the assembling work was investigated. As a result, as shown in Table 1, when the comparative example was used, four batteries were damaged by the short circuit, but no short circuit occurred when the product of the present invention was used. From these results, it can be seen that the product of the present invention has a smaller number of corrosion of the tab terminal at the time of the first charge and a smaller number of short circuits at the time of the assembling work, as compared with the comparative example.

[0008]

[Table 1]

[0009]

As described above, in the sealed lead-acid battery using the positive electrode tab terminal 3 or the negative electrode tab terminal 4 according to the present invention, corrosion during initial charging and short-circuiting during the work for assembling into the uninterruptible power supply device. unacceptable. In addition, by changing the color of the insulator 5 applied to the upper surfaces of the positive electrode tab terminal 3 and the negative electrode tab terminal 4, it is possible to display the polarity of these terminals. When this method is used, it is not necessary to color the positive electrode sealing agent 6 and the negative electrode sealing agent 7 in order to identify the polarity of the tab terminal as in the related art. Therefore, the same sealing material can be used, so that only one sealing agent filling machine can be used, so that equipment costs can be reduced and productivity can be improved.

[Brief description of the drawings]

FIG. 1 is an example of a positive electrode tab terminal of the product of the present invention.

FIG. 2 is an example of a positive electrode tab terminal of a comparative example.

FIG. 3 is a schematic diagram of a sealed lead-acid battery.

[Explanation of symbols]

1: battery case, 2: battery cover, 3: positive electrode tab terminal 4: negative electrode tab terminal, 5: insulator, 6: positive electrode sealing agent, 7: negative electrode sealing agent

Claims (4)

[Claims] 1. A sealed battery in which a tab terminal is used for at least one of a positive electrode terminal and a negative electrode terminal, wherein a part of the surface of the tab terminal is covered with an insulator. 2. The sealed battery according to claim 1, wherein a surface of the tab terminal covered with the insulator is an upper surface of the tab terminal. 3. The method according to claim 2, wherein the insulator is colored and used.
3. The sealed battery according to claim 1, wherein the positive electrode terminal or the negative electrode terminal is color-coded. 4. The sealed battery according to claim 1, wherein the insulator is made of an epoxy resin having acid resistance.