KR100406887B1 - Cylinder Lead Storage Battery using Expanded Collector - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded current collector for a cylindrical lead acid battery that cuts a central portion of a strip to make a lug, and a manufacturing method thereof, and more particularly to a center of a lead strip during an expanded current collector manufacturing process. After making a groove part and stretching it to manufacture an expandable current collector, and then to make a plurality of lugs by drilling at different intervals in the groove portion, by cutting only one connection portion of the lug to expand the two current collectors for the lead acid battery It relates to a manufacturing method and an extension current collector produced by the method.

In addition, the present invention relates to a cylindrical lead acid battery including a pole plate made of the above-described extension current collector and a manufacturing method thereof.

The extended current collector of the present invention can use the current battery production equipment without the introduction of additional equipment, it is possible to quickly manufacture a large amount of cylindrical lead acid battery pole plate using this. In addition, the present invention provides a lead acid battery having high energy density, excellent lifespan performance, and vibration resistance, which are general advantages of the cylindrical battery, by using the electrode plate made of the current collector.

Description

Cylindrical lead acid battery using expanded current collector {Cylinder Lead Storage Battery using Expanded Collector}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded current collector for a cylindrical lead acid battery, in which a lug is formed by cutting a central portion of a strip, and a method of manufacturing the same. After making a groove part and stretching it to manufacture an expandable current collector, and then to make a plurality of lugs by drilling at different intervals in the groove portion, by cutting only one connection portion of the lug to expand the two current collectors for the lead acid battery It relates to a manufacturing method and an extension current collector produced by the method.

Lead-acid batteries are used in automobiles and industrial applications. The general type of pole plate is a flat type paste pole plate, in which water and sulfuric acid are mixed and mixed with lead powder and glass fiber containing lead oxide (PbO) and lead (Pb). A paste is formed, and the paste is applied to a lattice-shaped current collector made of lead alloy, and then cured and dried to form a aged electrode plate, followed by a formation process to have an electrochemical activation. It is prepared by adding.

The current collector used to make the electrode plate is largely (i) a flat type current collector for use in general automotive batteries and some industrial batteries; (ii) a spine-type current collector mainly used for large industrial cells; And (iii) a current collector for use in producing a cylindrical battery.

The current collectors are subdivided according to the manufacturing method. First, as shown in FIG. 1, a general battery current collector having a plate shape of a rectangular or square shape except a lug portion may be divided into a gravity cast current collector and an extended current collector. Gravity-casting current collector is produced by dipping the current collector in the shape of a frame by adding lead molten metal to a casting mold, and expanding current collector is applied to the mechanical pressure on a long thin lead alloy plate called a strip (strip) After the punching grooves are punched and stretched to both sides, they are cut to a size similar to that of a cast current collector, and are mass-produced compared to conventional casting methods or sheet surface treatment methods.

Second, the current collector used in the tubular battery is composed of a current collector composed of a skeleton called a spine (8) cast on the anode by die casting, as shown in Fig. 3 to sandwich the tube, and filling the active material therebetween. To prepare. The manufacturing method is somewhat complicated but can prevent falling of the positive electrode active material requires a long life, or is mainly used in bad conditions.

Third, the current collector used in the production of a cylindrical lead acid battery is a long current collector, and the active material is applied to the current collector, laminated in the order of negative plate, separator plate, positive plate, separator plate, negative plate, and then rolled and aged. Through the manufacture of a cylindrical lead acid battery as shown in FIG.

Since the cylindrical lead acid battery is connected to the cells in series compared to the existing current collector, it is advantageous to increase the battery voltage by saving space, and the energy structure of the battery is improved due to the wide reaction surface area of the positive electrode and the negative electrode in the cell structure. It can extrude positive plate, negative plate and separator plate under high pressure, so it has excellent life performance.

The method for manufacturing a current collector of a sealed automotive battery longer than 1 m is largely two methods, the first is a method of direct casting by gravity casting, the second is a metal sheet or strip Method (US Pat. No. 5,958,620, Sep. 28, 1999).

In the case of the gravity casting, the length of the current collector can be adjusted according to the size of the casting mold, but the size of the casting machine increases due to the condition of using a long mold, and other casting machines for manufacturing the battery cannot be shared. In addition, there is a disadvantage that the size is increased in proportion to the current collector.

In the case of using a metal sheet or strip, an additional process such as chemical treatment is involved to improve interfacial adhesion when the lead active material is applied to a thin sheet or strip of 1 mm or less, as in the method of manufacturing a lithium (Li) battery. do.

On the other hand, the manufacturing method of the cylindrical battery-shaped electrode plate to form the inclined portion by processing both edges of the winding direction at a constant angle (Korean Unexamined Patent Application Publication No. 1998-11904, May 25, 1998); Method for manufacturing a battery plate for preventing the dropping of the active material by making the periphery and the center hole of the current collector the same (Korean Patent Publication No. 1998-75539, Nov. 16, 1998); And a method for manufacturing a battery pole plate for battery, which is achieved by rolling and cutting a substrate provided with an active material continuously to a predetermined size, wherein the method for manufacturing a battery pole plate for rolling and cutting at the same time (Korea Patent Publication No. 1998-23036, 1998. 7. 6) and the like, but the prior art is a case of manufacturing by changing the shape of the pole plate of the cylindrical battery, or manufacturing a pole plate for general battery, an example of a method using the extended current collector as in the present invention for the cylindrical lead acid battery Is unknown.

In addition, the present inventors have disclosed a method (manufactured by Republic of Korea Patent Publication No. 2001-46854, June 15, 2001) for producing a bipolar lead acid battery pole plate using an extension current collector by the present inventor, this technique is a conventional extension current collector The present invention relates to a pole plate for a pseudo bipolar lead acid battery composed of pairs by making grooves on both sides and partially drilling the grooves, and the present invention is prepared by cutting a central connection portion in the form of a lug during the manufacturing process of the extension current collector. An extended current collector is used for a cylindrical lead acid battery.

Accordingly, the present inventors have solved problems such as cumbersome manufacturing processes of the current collectors, a decrease in production, and a low energy density of the lead acid battery by using the electrode plate manufactured by the above-described current collector for a cylindrical lead acid battery.

It is an object of the present invention to provide a cylindrical lead acid battery including an extended current collector for a cylindrical lead acid battery made by cutting a central portion of a strip and a pole plate using the same.

1 is a cross-sectional view of a flat type current collector.

2 is a cross-sectional view of a unit cell produced using a plate-shaped current collector.

3 is a cross-sectional view of a spine type current collector for use in a tubular cell.

4 is a view of a cylindrical battery made of unit cells made of a cylindrical shape;

5 is a manufacturing process diagram of a general expansion current collector.

6 is a cross-sectional view of an extension current collector connected to a central portion.

7 is a cross-sectional view of a conventional expandable current collector, which makes a lug by drilling a central portion thereof.

8 is a cross-sectional view of two extension current collectors in which only one portion of the lug is cut in the current collector of FIG.

<Description of Symbols for Main Parts of Drawings>

2: cathode plate 4: anode plate

6: pole 8: spine

20: lead strip 24: groove

26 lug 28 perforation area

In order to achieve the above object, in the present invention, a groove portion is formed in the center of a lead strip and stretched to produce an expandable current collector, and then a plurality of lugs are made by drilling at different intervals on the groove portion, and then only one connection portion of the lug is made. The present invention provides a method of manufacturing two extended collectors for cylindrical lead acid batteries by cutting and an extended collector manufactured by the method.

Hereinafter, the present invention will be described in detail.

First, the present invention provides a method for producing a current collector for a cylindrical lead acid battery.

Extended current collector for cylindrical lead acid battery of the present invention

(i) making a groove in the center of the lead strip;

(ii) extending the strip to both sides of the groove to produce an extension current collector connected to a center portion;

(iii) perforating the grooves at different intervals to make lugs; And

(iv) it is manufactured by cutting one connection part of the lug.

The lead strip is made through continuous casting of a lead alloy in a rectangular parallelepiped, followed by rolling and rolling, and may be manufactured to a desired size and thickness.

Pressure is applied to the center portion of the lead strip 20 to form the groove 24 (see FIG. 6), and the extension portion is extended to both sides around the groove 24 made so that the center portion is connected and both strips have an extended current collector. To manufacture (see FIGS. 5 and 6).

The grooves 24 of the central portion are drilled at different intervals, ie, with increasing intervals, to produce several lugs 26 (see FIG. 7).

Thereafter, only one connecting portion of the lug 26 is cut (see FIG. 8) to produce an extended current collector for the cylindrical lead acid battery of the present invention, and as a result, two current collectors are produced.

The extension current collector used in the present invention has an advantage that the lugs may be located at the same site when the electrode plate is rolled into a cylindrical shape by cutting only one connection part of the lug by gradually increasing the spacing of the lug sites.

In addition, the present invention provides an extension current collector produced by the above production method.

In the present invention,

(i) applying a positive electrode active material and a negative electrode active material to the expanded current collector of the present invention to produce a positive electrode plate and a negative electrode plate;

(ii) laminating the negative electrode plate and the positive electrode plate together with a separator plate made of absorbent glass mat (AGM), and rolling them under pressure to construct a cell;

(iii) aging the cell; And

(iv) it provides a method of manufacturing a cylindrical lead acid battery comprising the step of charging the aged cells to the precursor, injecting an electrolyte solution and chemically converting it.

In the step (i), a paste prepared by mixing lead oxide, glass fiber, water, and sulfuric acid, the main component of which is lead oxide as a positive electrode active material and lead as a negative electrode active material, is coated on the manufactured current collector to prepare a positive electrode plate and a negative electrode plate for cylindrical lead acid batteries. do .

In the step (ii), a separator, an anode, an AGM separator, which absorbs sulfuric acid solution in the pores of the cathode and the glass mat by using the electrode plates prepared in the step (i), (hereinafter referred to as “AGM”), The cells are stacked in the order of the cathode and rolled in a cylindrical shape while applying pressure to the stacked electrode plates.

In the step (iii), the cell configured above is aged and dried in a conventional manner to make a aged active material electrode plate.

At this time, as a conventional aging method, the positive electrode plate aging method to produce low-temperature aging and tetra basic lead sulfate which is performed at a temperature of 70 ° C. or less in order to produce tribasic lead sulfate largely. All the high temperature aging methods performed at the temperature of 70 degreeC or more can be applied, and it is common for the negative electrode plate to apply the low temperature aging method. In the present invention, since the positive electrode plate and the negative electrode plate must be aged at the same time, it is preferable to ripen using a low temperature aging method.

Then, after charging the cell matured by the low temperature aging method to the precursor and injecting the electrolyte solution, it is chemically activated by injecting a current in a serialization method so as to be activated electrochemically (step (iv)).

In addition, the present invention provides a cylindrical lead acid battery produced by the manufacturing method.

As described above, since the expansion collector for cylindrical lead acid battery of the present invention is manufactured by gradually increasing the interval of the lug portion, the lug may be positioned at the same portion when rolled into a cylindrical shape, and used for a conventional vehicle battery plate Since it is possible to use an extended current collector, the current battery production equipment can be used without introducing additional equipment, and the pole plate of the cylindrical lead acid battery can be quickly manufactured in large quantities. In addition, it has high energy density, excellent lifespan performance and vibration resistance which are general advantages of the cylindrical lead acid battery.

Claims (4)

(i) making a groove in the center of the lead strip; (ii) extending the strip to both sides of the groove to produce an extension current collector connected to a center portion; (iii) perforating the grooves at different intervals to make lugs; And (iv) cutting one connection portion of the lug. The collector for cylindrical lead acid batteries manufactured by the method of Claim 1. (i) applying a positive electrode active material and a negative electrode active material to the current collector of claim 2, respectively, to prepare a positive electrode plate and a negative electrode plate; (ii) laminating the negative electrode plate and the positive electrode plate together with a separator plate made of absorbent glass mat (AGM), and rolling them under pressure to construct a cell; (iii) aging the cell; And (iv) a method of manufacturing a cylindrical lead acid battery, characterized in that it comprises the step of injecting the aged cell into the precursor to inject the electrolyte and chemically convert it. A cylindrical lead acid battery produced by the method of claim 3.