JPH0261967A - Monoblock type sealed lead accumulator - Google Patents

Abstract

PURPOSE:To wholly abolish lamination of electrode plates and separators for cell by cell and also the strap welding of the electrode plates between by forming a positive and a negative electrode plate with a plurality of cells consolidated, and using a mat-shaped separator equipped with a band-shaped recess which has undergone resin hardening so as not to allow movement of sulfuric acid ions. CONSTITUTION:One side of a lead alloy grating is filled with positive electrode paste 8 while the other side with negative electrode paste 9, and a non-filled portion 10 is provided. A plurality of electrode plates are coupled in a string by an H-profiled rod 14 made in oxidation resistance. A mat-shaped body, which is made of extra-thin glass fibers and has a large surface area, high porosity, elasticity, and flexibility, undergoes a pressure hardening process using an acid resistant, chemical resistant resin so as to provide a band-shaped recess 19. Electrolyte is held by this mat-shaped separator, and a bunch of electrode plates are piled with the recess 19 facing the above-mentioned rod 14 and inserted in an electrode jar 22 with a certain pressure applied, followed by provision of strap 20 and terminal 21. This constitution decreases the man- hours in assembly and suppresses internal drop of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in monoblock sealed lead acid batteries.

Conventional Technology There are two types of sealed lead-acid batteries in which oxygen gas generated from the positive electrode is absorbed by the negative electrode during charging: a retainer type and a gel type.Currently, the retainer type is often used.

Sealed lead-acid batteries are the most widely used secondary batteries that can be charged and discharged, and they have many features such as excellent battery characteristics, high reliability, and low cost. This is because it has. However, there is no end to user demand for lighter, smaller, and better-performing batteries at lower prices. To address this issue, efforts have been made to make electrode plates thinner and develop low-resistance separators, but these efforts are approaching their limits. In order to overcome this limit, new technology different from conventional technology has become necessary.

A conventional monoblock sealed lead-acid battery has a structure as shown in Figure 14, in which the positive and negative electrode plates are manufactured separately and are alternately separated through a mat-like separator (glass separator) made of fine glass fiber. After stacking the plates, the current ears 24 of the plates are welded to form a strap 25, as shown in FIG. 14A.
A monoblock sealed lead-acid battery is manufactured by manufacturing the electrode plate group shown in FIG. 1, then inserting it into @$127, and welding the inter-cell connections 26.

Problems to be Solved by the Invention As mentioned above, conventional monoblock sealed lead-acid batteries require a step of stacking positive electrode plates, negative electrode plates, and separators for each cell, and forming a strap by welding the current loops of the stacked electrode plates. The assembly process for monoblock sealed lead-acid batteries was complicated and time-consuming, including the process of inserting the electrode plates one cell at a time into the battery case and making connections between the cells. In particular, in order to perfect the welding of the strap, it is necessary to polish the current lugs of the positive and negative electrode plates to clean their surfaces, which takes a lot of man-hours. If this is not appropriate, the required battery performance may not be obtained, or the welded portion between the current tab of the electrode plate and the strap, or the strut itself, may corrode and break during use, causing malfunctions. On the other hand, in terms of battery performance, the straps and the connections between the cells are accompanied by a voltage drop due to electrical resistance, so to reduce this the straps and the connections between the cells must be made larger, but this increases cost and weight. Therefore, it cannot be increased unnecessarily.

Means for Solving the Problems The present invention was developed in view of the problems of the prior art, and consists of a bipolar plate in which a plurality of cells are integrated and a band-shaped recess made of hardened resin to prevent the movement of sulfate ions. By using the mat-like separator provided, it is possible to eliminate the need for the stacking process of electrode plates and separators for each cell, the strap welding process of electrode plate groups, etc.

Example Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 shows the shape of the lattice body used in the implementation of the present invention. In FIG. 2
3 is a main frame, 3 is a child unit, 4 is a connecting part for connecting the left and right lattice bodies, and 5 is an ear part for hanging.

This lattice body 1 is made of Pb-Ca-3n-based lead alloy or pb-s
Made of B-based lead alloy, one side has positive electrode paste,
The other side is filled with negative electrode paste. Note that the central portion of the lattice book with 4 after bonding is an unfilled portion of the paste. After filling with No. 2 and the negative electrode paste, aging is performed by a conventional method to obtain an unformed electrode plate. Suspension ears are necessary for loading onto a pallet, but they are unnecessary after forming an unformed electrode plate, so they are cut and removed. The grid 1' shown in FIG. 2 is for a positive or negative electrode plate used in an end cell of a monoblock battery.

The grid body is provided with current ears 6 as shown in the figure.

FIG. 3 shows an unformed bipolar plate 7 in which the grid body 1 is filled with positive and negative electrode pastes, aged, and the hanging ears are cut off. 8 is a positive electrode plate, 9 is a negative electrode plate, and 10 is the unfilled part of the paste. Reference numeral 11 denotes a picture frame parallel to the paste-unfilled portion 10, and is a portion that fits into a connecting rod having an H-shaped cross section, which will be described later.

FIG. 4 shows the positive electrode plate 12 and negative electrode plate 13 for the end cells.

FIG. 5 shows a connecting rod 14 for connecting the electrode plates,
As shown in the figure, the cross section is H-shaped and acid-resistant with grooves 15.

It is made of oxidation-resistant resin, such as polyethylene or poly-1-propylene. FIG. 6 is a perspective view showing a part of the state in which the electrode plates are connected using the connecting rod 13. Both! #!
The electrode plate 7 and the negative electrode plate 13 for the end cell are connected by a connecting rod 14 having an H-shaped cross section so that the plurality of electrode plates can be integrated and handled as one electrode plate. The connection method was such that the frame 11 of the electrode plate was fitted into the groove 15 of the connecting rod which had an H-shaped cross section.6 As shown in Fig. Recess 1 of reinforcing rod 16
If the structure is such that the frame at the bottom of the electrode plate is fitted into 7, the connected electrode plates will be fixed and it will be easy to assemble even a thin electrode plate. Furthermore, it is also possible to use one in which the connecting rod 14 and reinforcing rod 16 are integrally molded. Furthermore, if the fitting portions between the frame of the electrode plate and the connecting rod and reinforcing rod are fixed by heat welding, the electrode plate can be fixed more firmly.

FIG. 8 shows a separator 18 used in the monoblock sealed lead acid battery of the present invention. The figure shows a separator for 6 cells, and as shown in the AA cross section, the concave portion 19 in which the resin is hardened is exactly connected to the paste-unfilled portion 10 of both I#l electrode plates and the connecting rod 14 with an H-shaped cross section that connects the electrode plates. They are provided in strips at corresponding positions. The material of the separator has a diameter of 0.
5-1μl! f! High porosity materials such as mat-like wood made from fine glass fibers, mixed paper products of ultra-fine glass fibers and glass fibers or synthetic resin fibers of 5 to 19 μm, or open-cell foams made of acid- and oxidation-resistant synthetic resins, etc. at least 90%) and large surface area (at least 1.01
27g or more) and has elasticity and flexibility, and the resin curing is acid resistant to the porous body.

A recess is formed by impregnating a solution of a wood-oxidizing synthetic resin, such as a phenol resin, and hardening the resin by pressing under heat. Further, in the case of a porous body made of a thermoplastic synthetic resin, the concave portions can be formed simply by press hardening under heating. At this time, it is necessary to completely remove the pores of the porous body in the recesses where the resin has been cured. This is because if there are pores, ions in the sulfuric acid electrolyte will move, which may cause a short circuit between the two electrode plates.

FIG. 9 shows a state in which the series of bipolar plates and separators described above are stacked to form a group of six cells.
For the sake of clarity, the electrode plates and the separator are illustrated with a gap between them, but in reality, the separator and the electrode plates must be in close contact with each other under a certain degree of pressure. As shown in the figure, the resin hardening recess 1 of the separator 18
Reference numeral 9 is located at a location corresponding to the connecting portion of the electrode plates connected by the electrode plate connecting rod 14 having an H-shaped cross section and the paste-unfilled portion 10 of the bipolar plates. FIG. 10 shows a monoblock sealed lead-acid battery according to the present invention in which a stacked electrode plate group is inserted into a battery case 22 under a certain degree of pressure to form a strap 20 and a terminal 21. Note that 23 is an exhaust valve.

A special method must be used to charge the sealed lead-acid battery according to the invention having the structure described above.

This is because when dilute sulfuric acid is injected and free electrolyte is present, the two electrode plates become short-circuited and cannot be charged.

Therefore, dilute sulfuric acid is poured into an uncharged battery to impregnate the electrode plates and the porous separator with a sufficient amount of electrolyte, and then free excess sulfuric acid is discharged. In this way, the communication between the cells via the electrolyte can be cut off, allowing charging. It is preferable that the exhaust valve 23 be left in place during charging. In addition, in order to more completely cut off the communication between cells by electrolyte, cross section H
It is preferable to apply water repellent treatment to the shaped connecting rod 14 and the resin hardening recess 19 of the separator.

FIG. 11 is a perspective view showing an embodiment of a pond in which a plurality of electrode plates are connected to form one combined electrode plate, and FIG. The bipolar plates 7 are connected by a connecting rod 14 having an H-shaped cross section to form one combined plate, and the figure B shows three bipolar plates 7 connected together. These are all combination plates for assembling a sealed lead-acid battery with an electromotive force of 12V. It goes without saying that the same effect as in the previous embodiment can be obtained by using reinforcing rods 16 having a concave cross-section as shown in FIG. 7 on both sides of the combined electrode plate.

FIG. 12 is a diagram showing a separator to be matched with the electrode plate shown in FIG. 11, and is a separator for 6 cells (12V).
A concave portion 19 in which the resin is hardened is provided in a band shape at a position corresponding to a connecting rod having an H-shaped cross section that connects the paste-unfilled portion of the bipolar plate and the polar plate.

FIG. 13 is a diagram showing a monoblock sealed lead-acid battery according to the present invention using these electrode plates and separators.

Effects of the Invention As detailed above, according to the present invention, the conventional battery
There is no need to stack each cell's electrode plates, separators, weld strugs, or connect between cells, and since a battery case without partition walls is sufficient, the molding of the battery case is greatly simplified. The power can be changed arbitrarily by increasing the number of connected plates. Furthermore, the assembly of any number of volt batteries is substantially the same as that of a conventional single cell battery, which has a significant effect in reducing the number of assembly steps. Furthermore, since there are no connections or straps between cells, the internal resistance of the battery is lower.
It also has a significant effect on improving battery performance.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams showing an example of the grid used in the monoblock sealed lead-acid battery of the present invention, FIG. 3 is a diagram showing a pair of positive and negative polar plates, and FIG. FIG. 5 is a perspective view showing the connecting rod, FIG. 6 and FIG. 7 are views showing a part of the connected electrode plates, and FIG. 8 is a diagram showing the battery of the present invention. Diagram showing an example of the separator used, No. 9
The figure shows the state in which the electrode plate group of the battery of the present invention is formed.
Figure 0 is a diagram showing the monoblock sealed lead acid battery of the present invention.
FIG. 11 is a perspective view showing another embodiment in which a plurality of electrode plates are connected to form one combined electrode plate, FIG. 12 is a view showing an example of a separator used in the battery of the present invention, and FIG. 13 14 is a diagram showing an embodiment of a monoblock sealed lead-acid battery according to the present invention, and FIG. 14 is a diagram showing a conventional sealed lead-acid battery. 1... Lattice body, 2... Main frame, 3... Child unit, 4...
・Coupling rod, 6... Current ear, 7... Bipolar plate, 8...
・Positive electrode plate, 9... Negative electrode plate, 11... Similarity, 12...
・Positive electrode plate, 13...Negative electrode plate, 14...Connecting rod, 16
... Reinforcement rod, 18 ... Separator, 19 ... Hardened recess, 20 ... Scrap) ~ Wrap, 21 ... Terminal, 22
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Claims (1)

[Claims] 1. One lead alloy grid is filled with positive electrode paste and the other with negative electrode paste, and a bipolar plate with an unfilled part of paste at the boundary between the positive and negative electrodes, and a series of multiple electrode plates. The plate connecting rod has an H-shaped cross section and is made of acid- and oxidation-resistant synthetic resin, and has a large surface area and high porosity, and has a band-shaped recess made of hardened resin to prevent the movement of sulfate ions. A highly compressed electrode plate group consisting of a mat-like separator for retaining an electrolyte and having elasticity and flexibility is arranged in a battery case without cell spacing walls. Block type sealed lead acid battery.