JPS62165855A - Manufacture of lead storage battery - Google Patents

Abstract

PURPOSE:To make it possible to connect a thick mat securely, by pressing the contact surface in a preliminary pressing to make the thickness thin and uniform, and connecting it by supersonic waves or a heat hone. CONSTITUTION:When a positive or a negative electrode is connected to a porous mat-form body in a bag form, the contact surface of the porous mat body is pressed preliminarily by supersonic waves or a heat hone. By giving a preliminary pressing to the portion connected in a bag form before the connection, to make a thin and uniform thickness, and then connecting by using supersonic waves or a heat hone, a thick mat body can be connected securely as a whole, and the reliability of the battery is improved. Furthermore, in order to connect the contact surface more easily,the compression rate of the preliminary pressing is made more than 20%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a gas absorption lead acid battery.

Conventional technology Gas absorption storage batteries generally have a mat combined with a glass aim as a separator interposed between the electrode plates to limit the amount of electrolyte to the extent that it can be absorbed by the electrode plates, and to transfer oxygen generated from the positive electrode to the negative electrode. This is a type of battery that absorbs water and returns it to water. In this type of battery, the common method is to sandwich the positive or negative electrodes one by one between the mats in a U-shape and stack them, and if the sides of the electrode plates are open, side shorts may occur. Since this happens, the open parts have been joined using ultrasonic waves or a heat horn.

Problems to be Solved by the Invention The mat body made of glass IO fibers has the same thickness at the part that absorbs liquid and the part where it is joined as a bag, and the thickness is approximately 0.5 nn.1. (Because the mat material is porous and the mat material is porous, it is difficult to weld the joints that are to be made into bags.) Even if we try to weld it, it will not adhere easily, resulting in a series of failures, and if the welding energy is increased unnecessarily, part of it will melt too much, opening a hole and causing a penetration.

The present invention solves the above-mentioned problems, and provides a manufacturing method that can easily weld a thick and porous mat body and efficiently and reliably bag it to obtain a highly reliable lead-acid battery. The purpose is to provide

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention aims to solve the above-mentioned problems by applying ultrasonic waves or heat to the surfaces of the porous mat bodies to be joined when bonding the positive electrode or the negative electrode in a bag shape using a porous mat body. Preliminary pressing is performed before joining with a horn, and more preferably, the compression ratio of the joint surfaces of the porous mat bodies by preliminary pressing is 20% or more.

Effect With the above configuration, the part to be joined into a bag shape is pressed with a preliminary press to a thin and constant thickness before joining, and then ultrasonic waves,
Alternatively, when joining with a heat horn, the thick mat body can be completely welded securely, and the reliability of the battery can be increased. Furthermore, in order to better join the parts to be joined, the compression ratio by preliminary pressing is set to 20% or more.

Example An embodiment of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of a battery structure according to an embodiment of the present invention. 1
2 is a positive electrode, 2 is a negative electrode, and 3 is a mat-like separator, which encloses an electrode plate in a bag shape. , 4 is the electrode group strap, 5
1 is a battery case, and 6 is a joint where the mat-like separator 4 is made into a bag.

Figure 2 shows part of the process of enclosing the electrode plate in a bag-like mat-like separator, where 7 is a heat or ultrasonic welding horn, 8 is a pedestal facing the horn, and 9 is a mat-like separator. By pre-pressing the mat body, the welding energy from the welding horn 7 can be better transmitted and the mat-like separator can be formed into a bag shape.

The weld strength during the tensile test of matte separators (width 50% m x length 301 n) with and without pre-pressing is as shown in Figure 3, and the compression ratio of 0% (A> In this case, it can be seen that the bonding state at the welded part is incomplete.In addition, the compression ratio of 6 after preliminary pressing
It can be seen that in the case of 0% (B), the case of 40% (C), and the case of 20% (D), the bonding state at the welded portion is good and the effect of the preliminary pressing has been achieved. It can also be seen that the higher the compression ratio, the stronger the welding strength and the more suitable it is for joining mat bodies.

Furthermore, with the above configuration, 1. During an over-discharge cycle characteristic test that combined a pattern of discharging for 20 hours with OA, connecting a 10W lamp for one week, and charging at 1.58 for 30 hours, the following results were obtained during normal discharge (L75V/cell or more). Duration is 4th
As shown in the figure, without pre-pressing (A) shows an extreme capacity drop, whereas with pre-pressing (B), (C), and (D), the capacity is stable over a long period of time. It shows the characteristics and shows that the battery is highly reliable. If preliminary pressing is not performed (as a result of disassembling the battery in A>,
The decrease in capacity was due to incomplete bonding at the separator welds at the ends of the electrode plates, which allowed dendrite growth, leading to short circuits.

As described above, according to the present invention, thick mats can be reliably welded by pressing the joint part with a preliminary press to make it thin and constant in thickness, and joining with ultrasonic waves or a heat horn.
The industrial value of increasing the reliability of batteries is extremely large.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the structure of a storage battery according to an embodiment of the present invention, Fig. 2 is a perspective view showing a part of the process of enclosing the electrode plate with a bag-like mat separator, and Fig. 3 is a welding strength FIG. 4 is a diagram showing overdischarge cycle characteristics. DESCRIPTION OF SYMBOLS 1... Positive electrode, 2... Negative electrode, 3... Mat-like separator, 4... Plate group strap, 5... Battery case, 6...
...Matt-like separator joint, 7...Ultrasonic or heat horn, 9...Pre-pressed joint agent Yoshihiro MorimotoFigure 1 #stand gβ Figure 2Figure 3■ Figure 44 j! ZJ11! ;6719m

Claims (1)

[Scope of Claims] 1. A lead-acid battery in which, when bonding a positive electrode or a negative electrode in a bag shape with a porous mat, preliminary pressing is performed on the surfaces of the porous mat to be bonded before bonding using ultrasonic waves or a thermal horn. manufacturing method. 2. The method for manufacturing a lead-acid battery according to claim 1, wherein the compressibility of the joint surface of the porous mat body by preliminary pressing is 20% or more.