JP2576714B2 - Manufacturing method of cathode plate for lead-acid battery - Google Patents

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 cathode plate for a lead-acid battery suitable for making the lead-acid battery thin.

[0002]

2. Description of the Related Art The electrode group structure of a sealed lead-acid battery has a structure in which an anode plate and a cathode plate are stacked via a retainer which is an electrolyte holder. At least one anode plate and two cathode plates
It is common to use a single-sheet configuration. With the miniaturization of devices that use sealed lead-acid batteries as power sources, it is also desired to make the sealed lead-acid batteries thinner, but the grid base of paste-type electrode plates is manufactured by a casting method or an expanding method. Since the thinning has a manufacturing limit, the number of electrode plates as described above is three.
A single electrode plate group configuration cannot adequately meet the demand for thinning. Therefore, the anode plate 1 must be
A single electrode plate group is required.

[0003]

In the above-described electrode group configuration of one anode plate and one cathode plate, the thinner the electrode plate, the higher the weight ratio of the grid base not involved in the battery reaction, and
Since the cathode plate exists only on one side of the anode plate, the utilization rate of the anode active material is not sufficiently increased, resulting in a lead-acid battery having a low weight energy density. The problem to be solved by the present invention is to make it possible to manufacture a thin and lightweight lead storage battery having a high weight energy density by improving a cathode plate.

[0004]

In order to solve the above-mentioned problems, in a method of manufacturing a cathode plate for a lead-acid battery according to the present invention, an active material paste is thinly applied to one surface of a retainer as an electrolyte holder. Apply lead foil on the surface and weld the lead foil around the active material layer in a frame after formation to form an electrode plate, or pour molten lead around the active material layer after formation to form a lead frame. To form an electrode plate shape.

[0005]

In the manufacturing method according to the present invention, since the lattice base conventionally used is not used, it is possible to reduce the weight and thickness accordingly. This cathode plate constitutes an electrode group by contacting the retainer surface opposite to the surface on which the active material layer is formed with the anode plate, but is in contact with both surfaces of the anode plate to form three electrode plates. Even if the utilization rate of the anode active material is improved by adopting the plate group configuration, the thickness does not increase as much as the conventional electrode plate configuration having three electrode plates. Further, the lead foil is effective in preventing the active material from falling off and improving the life of the battery. When the lead foil is welded in a frame shape around the active material layer, the mechanical strength of the electrode plate can be made sufficient. The same applies to the case where a lead frame is formed around the active material layer by pouring molten lead.

[0006]

EXAMPLE An active material paste for a cathode was applied on a retainer 1 serving as an electrolyte holder to form an active material layer having a length of 86 mm, a width of 56 mm and a thickness of 0.6 mm. Length 10mm, width 5m
m, a part of a 0.3 mm thick lead foil is embedded in the active material layer 2,
The exposed portion was the electrode plate ear 2. Thereafter, the lead foil 3 was attached to the active material layer to form a chemical. After the formation, the entire circumference and the center of the active material layer were partially pressed with a 330 ° C mold,
The lead foil 3 was welded to the active material layer. 4 is a press part.

An anode plate having a length of 86 mm, a width of 56 mm and a thickness of 1.1 mm is brought into contact with both sides of a retainer surface of the cathode plate opposite to the active material layer 2 to form a three-electrode plate group. A sealed lead-acid battery was assembled (product of the present invention). On the other hand, for comparison,
A sealed lead-acid battery of a conventional two-electrode group consisting of one cathode plate and one anode plate in which an active material was held on a lattice base manufactured by casting was assembled (conventional product).

FIG. 2 shows a comparison of the capacity of 1A constant current discharge between the product of the present invention and the conventional product in the initial stage. The discharge duration of the conventional product was 65 minutes, but the product of the present invention was 90 minutes, which is a 38% increase in capacity compared to the conventional product.

Further, in the product of the present invention, since the grid base is not used for the cathode plate, the weight of the battery is reduced as shown in Table 1, and the energy density is increased by 52%.
The battery life of the product of the present invention is extended up to 300 charge / discharge cycles.

[0010]

[Table 1]

[0011]

As described above, the cathode plate according to the present invention is thin and lightweight, and the thickness of the battery does not increase even if it is arranged on both sides of the anode plate to form an electrode group. Since the cathode plate can be arranged on both sides of the anode plate while reducing the size and weight, the utilization rate of the anode active material is increased, and the weight energy density is greatly improved. Furthermore, battery life can be extended.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a cathode plate according to the present invention.

FIG. 2 is a curve diagram comparing the initial discharge capacity of a product of the present invention and a conventional product.

[Explanation of symbols]

 1 is a retainer 2 is an electrode plate ear 3 is a lead foil 4 is a weld

Claims (2)

(57) [Claims] An electrode plate is prepared by thinly applying an active material paste to one side of a retainer serving as an electrolytic solution holding body, pasting a lead foil on the surface, and welding the lead foil in a frame shape around the active material layer after formation. Shape
A method for producing a cathode plate for a lead-acid battery, comprising: 2. An active material paste is thinly applied to one side of a retainer, which is an electrolyte holding body, and a lead foil is attached to the surface, and after formation , molten lead is poured around the active material layer to form a lead frame. very
A method for producing a cathode plate for a lead-acid battery , comprising a plate shape .