JPH06223810A - Manufacture of lead-acid battery - Google Patents

Abstract

PURPOSE:To weld a lug part to a strap without fluctuation of welding strength by applying flux to the lug part of an electrode plate group, soaking a tip of the Jug part into a molten lead alloy to melt the tip of the lug part, then drawing out the lug part from this bath, and tightly fixing the lug part to the strap by using a cast-on-strap method. CONSTITUTION:Negative electrode plates and positive electrode plates are alternately laminated with separator plates interposed between them to form an electrode group 5. This electrode group 5 is inverted and soaked into a flux solution to stick flux to a lug part 1a. Next, a tip of the lug part 1a is soaked into a bath wherein a molten lead alloy 6 is filled to fuse and cut the lug part 1a at a horizontal level 6a. At this time, the flux stuck to the lug part 1a is activated and a solvent of the flux is eliminated. Then, the electrode plate group 5 is drawn out from the bath, a strap is formed by a cast-on-strap method and the lug part 1a is welded to the strap. Accordingly, tip height of the lug part 1a becomes constant and fluctuation of welding strength is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lead storage battery, and more particularly to a manufacturing process for joining a strap to an ear portion of an electrode plate group in which positive and negative electrode plates and a separator of a lead storage battery are laminated. is there.

[0002]

2. Description of the Related Art Conventionally, in the manufacturing process of lead acid batteries,
The cast-on-strap method is widely used as a method of connecting the ears of the electrode plate group with straps. This method involves immersing the ears of a group of electrode plates in which a plurality of anode plates and cathode plates are alternately laminated with appropriate separators interposed between them, solidifying them in this state, and welding them together. However, before dipping the ear portion in a molten lead alloy, the tip of the ear portion is dipped in flux to apply the flux to the ear portion,
Then, hot air was applied to the ears to dry the flux to reduce a part of the lead oxide in the ears and preheat the ears to facilitate bonding with the molten lead alloy to be the strap.

[0003]

The method described in the prior art has the following problems. That is, (1) Since the heights of the electrode plates vary, when the electrode plates are placed on a flat surface to form an electrode plate group, the heights from the bottom side of the electrode plate group to the tips of the ears vary. It was happening. When the ears of such an electrode plate group are immersed in the molten lead alloy, there is a difference in the amount of insertion of the ears into the molten lead alloy, overheating occurs when the depth is shallow and insufficient heating occurs when the depth is deep. There was a difference in the welding strength between the ear and the strap.

(2) If some of the ears of the electrode plate group are bent at the tips and come into contact with the adjacent ears, when they are immersed in the molten lead alloy, the ears are separated from the adjacent ears. The molten lead alloy did not sufficiently penetrate into, and the welding of the ear portion and the strap in this portion was incomplete. (3) When the ear to which the flux has adhered is dried by hot air and preheated, the amount of heat at the portion of the ear that is not exposed to the hot air is insufficient and welding between the strap and the ear is incomplete. (4) In hot-air drying, the flux was not sufficiently dried, and the remaining water was gasified during the welding of the ears and the molten lead alloy and remained as bubbles in the strap, resulting in incomplete welding.

The present invention has been made in view of the above problems, and an object of the present invention is to eliminate variations in the welding strength between the ears and the straps of the electrode plate group and to complete the welding. There is a place to do it.

[0006]

In order to solve the above problems, the present invention provides a plurality of anode plates and cathode plates with a separator plate interposed between them to form an electrode plate group. Flux is applied to the ears, and then the tip of the ears is immersed in a bath of molten lead or molten lead alloy heated to a temperature equal to or higher than the melting point of lead,
The tip of the ear portion is melted, then the tip of the ear portion is pulled out from the bath, a strap is formed by a cast-on strap method, and the strap and the ear portion are welded to each other.

[0007]

[Operation] The height of the electrode group up to the tip of the ear varies, but if the tip of the ear is immersed in a bath of molten lead or lead alloy and melted, the height to the tip of the ear is made uniform. You can Further, since a large amount of heat is transferred to the ears, the ears can be completely dried, and the flux is activated to reduce lead oxide in the ears and complete welding with the molten lead alloy that becomes the strap. Further, since the ears are heated by the hot molten lead or the lead alloy in a short time, the ears are heated uniformly without being affected by the ambient temperature, and the welding becomes uniform and complete.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, a cathode plate 1 and an anode plate 2 are alternately laminated with a separator plate 3 interposed therebetween to form an electrode plate group 5, and the electrode plate group 5 is formed.
Is housed in the case 4 as shown in FIG. Ear part 1 of electrode plate group 5
As for a and 2a, the ear portion 1a of the cathode plate 1 and the ear portion 2a of the anode plate are arranged in one row on the left and right sides, respectively, as shown in FIG. Next, this electrode plate group 5 is inverted together with the case 4 and immersed in the flux liquid to attach the flux to the ears 1a, 2a. Next, as shown in FIG. 2, the tips of the ears 1a of the electrode plate group 5 are immersed in a bath filled with the molten lead alloy 6, and the ears 1a are cut by the horizontal surface 6a of the molten lead alloy 6. At this time, the ear portion 1a receives heat from the molten lead alloy 6, activates the flux adhering to the ear portion 1a, and expels the flux solvent. It also performs a preheating action prior to the welding of the molten lead alloy and the ear in the next step. Although FIG. 2 shows a method of fusing the tip of the ear 1a of the cathode plate 1, the tip of the ear 2a of the anode plate 2 is similarly processed. In the present embodiment, the temperature of the molten lead alloy 6 is set to 400 for the ear 1a of the cathode plate 1.
Up to 460 ° C. and 400 for the ears 2a of the anode plate 2.
It was set to ˜500 ° C. Further, the time for immersing the ears 1a, 2a in the molten lead alloy 6 was 0.1 to 2.0 seconds.

Next, the electrode plate group whose tips of the ears 1a, 2a have been melted is pulled out of the bath, a strap is formed by the conventional cast-on-strap method, and the ears 1a,
2a and the strap were welded together. The welding state of the strap and the ear portion was examined for the electrode plate group with a strap thus manufactured and the electrode plate group with a strap manufactured by the conventional method. The height of each electrode plate and the distance between the ears before welding the strap and the ears were also investigated. The results are shown in the table below.

[0010]

The voids shown in the table are holes formed in the welded portion of the strap and the ear, and indicate the maximum diameter of the hole and the number of holes per strap. Also,
The ratio of the number of ears with a gap between the ears and the strap is the ratio (%) of the number of ears with a gap to the number of ears welded to the strap.

[0011]

Since the present invention is configured as described above, it has the following effects. (1) Since the heights of the tips of the ears 1a, 2a of the electrode plate group 5 are constant, the insertion depth into the molten lead alloy to be the strap is constant, and the variation in the welding strength between the ears 1a2a and the strap is uneven. Decrease. (2) The ears 1a and 2a of the electrode plate group 5 are, for example, 1 in FIG.
Even if they are in contact with each other like a ′ and 1a ″, the contact portions are melted and cut, so that the molten lead alloy serving as a strap is completely adhered to the periphery of the ears 1a ′ and 1a ″ to enhance the welding strength. (3) Since the ears 1a, 2a are preheated by the molten lead alloy, the heat conduction is better than that by hot air drying, the ears dry faster, and the flux reduces the lead oxide in the ears 1a, 2a. . Therefore, no voids or gaps are formed in the welded portions of the ears 1a, 2a and the strap, and the poor welding due to insufficient heat of the ears 1a, 2a is eliminated.

[Brief description of drawings]

FIG. 1 is an external perspective view of an electrode plate group housed in a case according to the present invention.

FIG. 2 is an explanatory diagram showing a process of fusing the ears of the electrode plate group according to the present invention with a molten lead alloy.

[Explanation of symbols]

 1a, 2a Ear part of electrode plate 5 Electrode plate group 6 Molten lead alloy

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutomo Ohashi 6-6 Josaimachi, Takatsuki City, Osaka Prefecture Yuasa Corporation

Claims (1)

[Claims] 1. A flux is applied to the ears of the electrode plate group, and then the ears tips are immersed in a bath of molten lead or a molten lead alloy heated to a temperature equal to or higher than the melting point of lead to dissolve the ears tips.
Next, a method of manufacturing a lead storage battery, characterized in that the tip of the ear portion is pulled up from the bath, a strap is formed by a cast-on strap method, and the strap and the ear portion are welded together.