JPH01206569A - Manufacture of lead-acid battery - Google Patents

Abstract

PURPOSE:To enhance the producibility and anti-seismic property by inserting a group of electrode plates, equipped with separators having an opening in the neighborhood of the bottom, into a battery jar, and fixing the bottoms of the separators and the lower part of electrodes not surrounded by the separators, to the bottom with adhesives. CONSTITUTION:A positive electrode plate 2 is wrapped in the form of a sack in a battery jar 1, and a group of electrode plates consisting of separators 4 whose left and right edges 3 are bonded and a negative electrode 5 not surrounded by separators 4 in the form of sack are inserted. A positive electrode tab 7 and a negative electrode tab 8 of the electrode plates are welded to straps 9, 10, and one of the positive electrodes has a connection part 12 for the next cell, and the negative electrode 5 is connected to an external terminal 13. An adhesive 18 in fluid condition injected to the bottom of the battery jar 1 intrudes from opening 15 in the neighborhood of the bottom of the sack-shaped separators, the lower part of exposed electrode, and the bottom of the separators 4 to attain the lower part of the electrode plates in the sack-shaped separator 4 so as to fix them to the bottom of the battery jar 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a lead-acid battery, which particularly improves seismic resistance and provides versatility.

In conventional lead-acid batteries, the positive and negative electrodes are generally assembled via a separator, and the current collector is welded to a strap to form a group of electrode plates, which is housed in a battery case and connected between adjacent cells. It is completed by joining the parts and welding the lid to the battery case. In recent years, in this structure, at least one of the positive and negative electrodes has been made into a bag-like separator to streamline the handling of the electrode plates and to reduce the risk of short circuit between the electrode plates due to falling substances. An enveloping structure is being adopted. This configuration has shown excellent reliability for ordinary vehicles traveling on flat roads.

However, when considering the wide range of applications such as starter power sources for off-road sports cars that enjoy rough roads, agricultural machinery, construction machinery, etc., in reality, lead-acid batteries for general automobiles are used as they are, and unexpected problems occur. often occurs. Also, on the dealer side, for each of these uses,
Since it is difficult to separately sell suitable storage batteries to each customer, there has been a demand for a versatile lead-acid battery with excellent earthquake resistance.

Problems to be Solved by the Invention For a long time, in order to improve earthquake resistance, in addition to increasing the insertion pressure of the electrode plate group into the battery case, there was also a method of increasing the insertion pressure of the electrode plate group into the battery case. Attempts have been made to fix the electrode plate group. However, it has been found that this adhesion method is substantially less effective in a configuration using bag-shaped separators. The reason for this is that the failure phenomenon caused by vibration is not caused by the simple vertical or horizontal movement of the electrode plate, but rather the electrode plate moves like a pendulum around the strap that gathers the current collecting ears of the electrode plate as a fulcrum. This is because, in addition to this phenomenon, damage to the base of the ear and the strap weld and the area around the base of the ear on the electrode plate side is severe.

In other words, in the structure of the bag-shaped separator, even if the bottom of the separator is fixed to the inner bottom of the battery case, the lower part of the electrode plate included in the separator is not fixed.

The present invention provides a method for manufacturing a lead-acid battery with high productivity and excellent earthquake-resistant structure without sacrificing the advantages of the high reliability and handling of the bag-shaped separator.

Means for Solving the Problems As a specific means, the present invention provides an electrode plate group including a separator that wraps at least one of the positive and negative electrode plates and has an opening in the vicinity of the bottom of the electrode plate group. It is inserted into a battery case coated with adhesive, and the bottom of the separator, the lower part of the electrode plate not wrapped with the separator, and the lower part of the electrode plate wrapped with the separator are simultaneously fixed to the bottom of the battery case with adhesive. .

In other words, in the present invention, the adhesive placed on the inner bottom of the battery case penetrates into the bottom of the bag-like separator, the lower part of the electrode plate that is not wrapped with the separator, and the inside of the bag-like separator through the opening. The three lower parts of the rare electrode plate, that is, all the lower parts of the electrode plate group, are directly fixed to the inner bottom of the battery case, and the opening of the bag-like separator is simultaneously filled and sealed. Therefore, the lower part of the electrode plates inside the separator can be fixed to suppress their pendulum-like interlocking, and a highly earthquake-resistant structure can be achieved while taking advantage of the bag structure of the separator to increase productivity. be able to.

Example The present invention will be explained in detail below with reference to Examples.

FIG. 1 shows an example of the structure of a lead-acid battery to which the present invention is applied. In the figure, 1 is a battery case, in which the positive electrode plate 2 is wrapped in a bag shape, and a separator 4 with the left and right edges of 3 joined mechanically or by adhesive or heat, and the separator 4 is surrounded in a bag shape. A plate group consisting of negative electrodes 6°6 and 6°6, which are not connected to each other, is constructed and inserted. Positive electrode ears 7 of these electrode plates. The negative electrode ears 8 are welded to the straps 9, 1o, respectively, one of the positive electrodes has a connecting part 12 to the next cell, and the negative electrode is electrically connected to the external terminal 13. The bag-shaped separator 4 is applied to both positive and negative polar plates, and even if the positive and negative electrodes are reversed, the basic idea and effects are within the scope of the present invention.

In this example, as shown in 16 in FIG. 1 and 16 in FIG. A separator with holes 15 such as the one shown in FIG. An example of the operation is shown. In the configuration shown in FIG. 1, reference numeral 18 denotes an adhesive such as epoxy resin, which is placed at the inner bottom of the battery case. The adhesive is in a fluid state before it solidifies, and has been fluidized in advance at least before or after inserting the electrode plate group into the inner bottom of the battery case 1, and is applied to the bottom of the separator, the lower part of the exposed electrode plate, and the bag shape. It enters through the opening near the bottom of the separator, reaches the lower part of the electrode plate in the bag-like separator, and is fixed to part or all of the bottom of the three-part battery case. Therefore, although it basically requires a process improvement to the extent of inserting adhesive into the inner bottom of the battery case, an earthquake-resistant structure can be realized without significantly reducing production efficiency.

As for the adhesive, in addition to thermosetting resins such as epoxy resins, polyester resins and hot-melt thermofusible resins can be used.

The viscosity of thermoplastic resins and tar-based resins, which are called hot-melt resins, can be adjusted freely by adjusting the temperature, and they can prevent excessive penetration into the electrode plates. It is extremely suitable for applying the present invention in that fluidization and solidification can be repeated at any time.

When using this hot-melt resin, it is easiest to inject the fluidized high-temperature resin into the inner bottom of the battery case and insert the electrode plate group before the temperature drops. At this time, it is a good idea to increase the temperature of the battery case, the temperature of the electrode plate group, and the ambient temperature in advance to avoid rapid cooling.

On the other hand, another advantage of hot-melt resin is that it can be inserted into the inner bottom of the battery case in solid form and then heated and fluidized after inserting the electrode plates therein.

Further, in terms of structure, the opening 15 of the separator shown in FIG.
16 is completely buried in the adhesive at the bottom of the container to prevent short circuits. When adopting this configuration, it is better to use a battery case without a crack at the inner bottom, as a structure with a crack at the bottom of the container restricts the position of the lower part of the electrode plate group and requires a large amount of adhesive. Furthermore, as long as the configuration of the present invention is adopted, the openings of the separator once provided are closed with adhesive;
There is no risk of short circuit.

Effects of the Invention It is obvious that the seismic effect of the present invention is already extremely high in the above structure, but in order to make the difference from the conventional technical scope of the -layer clear, a structure in which no opening is provided at the bottom of the bag is adopted. Comparing present invention A, present invention A has a much higher earthquake resistance of 13G compared to B's 8G based on 2 hours of earthquake resistance.

Moreover, the workability of that process is almost the same as that of B.

That is, the present invention has a structure in which the electrode plate is surrounded and stored in a bag-like separator, and also fixes not only the bag-like separator but also the lower part of the electrode plate inside the separator, which is separated from the battery case by the separator, to the battery case. It solves the contradiction of suppressing movement reservation linkage, and its industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a lead-acid battery according to an embodiment of the present invention, and FIG.
The figure shows an example of an opening, and FIG. 3 is a diagram showing an example in which a slit-like opening is provided in a bent part. 1...Battery container, 2...Positive electrode, 3...
...Welded part of bag-shaped separator, 4... Separate lake, 5, 6... Negative electrode, 16... Opening part at the bottom of separator, 16... Opening portion due to welding deletion, 18... Adhesive, 19... Slit-shaped opening section.

Claims (2)

[Claims] (1) Inserting a group of electrode plates including a bag-like separator that wraps around at least one of the positive and negative electrode plates and having an opening near the bottom into a battery case with an adhesive disposed on the inner bottom; 1. A method for manufacturing a lead-acid battery, comprising fixing a lower part of the electrode plate to an inner bottom of a battery case using an adhesive that enters through the bottom of the separator and the opening. (2) The method for manufacturing a lead-acid battery according to claim 1, wherein the battery case has no cracks at its inner bottom.