JPH0226127Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to improvements in electrode groups for lead-acid batteries.

Conventional technology and its problems Originally, the lattice-shaped electrode plates of lead-acid batteries were cast from a heavy lead alloy with a specific gravity of 11.3, so the electrode plates alone were quite heavy, so it was necessary to reduce their weight. Efforts have been made to reduce its thickness, but there are certain limits to this. Therefore, the next idea was to use lead alloy only in the parts necessary for electrolytic action and conduction, and to use a synthetic resin with a specific gravity of 1/10 of that of lead alloy in the part that holds these parts. Various alloy/synthetic resin composite lattices have been considered. However, this also did not increase productivity due to the complicated manufacturing process and was unsuitable for mass production.

Therefore, a further idea was devised by molding a skeleton such as a lattice using acid-resistant synthetic resin and immersing it in molten lead or lead alloy, or by applying molten lead or lead alloy to this. The surface is coated with lead or a lead alloy, and such a material is suitable for mass production, and the electrode plate can also be made lighter.

Figures 1a and 1b are side sectional views and front sectional views showing the configuration of a conventional lead-acid battery. In the figures, 1 is a synthetic resin battery tank, 2 is a positive electrode plate, and 3 is a negative electrode plate. be. These electrode plates 2 and 3 are made by immersing a grid made of polypropylene resin in molten pure lead at 335°C for about 0.3 seconds and pulling it up, thereby depositing a thin lead film of about 200 μm thick on the surface of the grid. It is filled with a paste-like active substance. 4 is an ear part of an electrode plate provided integrally with the grid body, 5 is a separator whose main component is glass fiber, etc.
This separator plate 5 is inserted between the electrode plates 2 and 3 to isolate the electrode plates 2 and 3, thereby forming an electrode group 12. Reference numeral 6 indicates a current collector plate to which the ear portion 4 covered with a lead thin film of each electrode plate 3 is welded using a lead alloy, and 7 indicates a pole pole made of a lead alloy rod, one end of which is a current collector plate using a lead alloy. It is welded to 6. Reference numeral 8 denotes a connector made of lead alloy or lead-plated copper, to which the other end of the pole column 7 of each cell is connected. Reference numeral 9 denotes an adhesive mainly composed of epoxy resin or the like, and the upper part of the pole column 7 and the connector 8 are embedded in the adhesive 9 injected into the upper part of the interior of the battery cell 1 .

In the conventional example configured in this way, the electrode plates 2 and 3 are already lightweight by using synthetic resin grids, but since the current collector plate 6 and pole column 7 are made of lead alloy, lead-acid batteries There was a limit to the overall weight reduction. Furthermore, if the synthetic resin of the substrate is melted at the same time when welding the ear portion 4 to the current collector plate 6, the conductivity may decrease and the yield of the product may decrease, or the welding between the ear portion 4 and the current collector plate 6 may be caused. The problem was that it became difficult to do so, and productivity decreased.

The purpose of the present invention is to further reduce the weight of a storage battery and to improve productivity.

Means for Solving the Problems The lead-acid battery of the present invention has a synthetic resin battery cell, an electrode group consisting of a central electrode plate at one pole and electrode plates at the other pole arranged on both sides with separators interposed therebetween. and,
It has a connector and a connecting agent.

The electrode plate has a synthetic resin grid and integrated flexible ears, the surface of which is coated with lead or a lead alloy, and the active substance is fixed to the grid.

The ears of the electrode plates are extended upward, and the tips of the ears of at least the other electrode plate are elastically bent and tied together, and connected to a connector made of lead-plated copper wire or the like. .

The electrode group is housed in a synthetic resin battery tank, and the tips of the ears and connectors are embedded in the adhesive filling the upper space of the battery tank.

That is, the main point of the structure of the present invention is that in a lead-acid battery using a synthetic resin electrode grid, not only the electrode grid and the ears are made of synthetic resin as in the conventional case, but also the ears, The current collector plate and pole pole are also made of synthetic resin and are integrated with the electrode plate grid, which is bent and connected directly to the connector.

Embodiment FIG. 2 is a sectional view showing the structure of an embodiment of the present invention, and the same reference numerals as those in FIG. 1 indicate the same parts. Note that Figure 2a is similar to Figure 2b.
It is a sectional view when cut along AA'. Reference numeral 10 denotes an ear portion, which is made of flexible synthetic resin and is provided integrally with the grid, and its surface is covered with a thin film of lead or lead alloy so as to be continuous with the grid portion. Further, its tip extends to the upper part of the battery cell 1. 11 is a connector made of lead-plated copper wire or the like.

In this embodiment configured in this way, first, the second
As shown in Figure a, the tips of the ears 10 of the two negative polarity plates 3 in one cell are tied together at one end of the connector 11, and then joined as shown in Figure 2b. , by joining the tips of the ears 10 of one positive polarity plate 2 in another cell at the other end of the connector 11, the electrode groups 12 of each cell are connected to each other, and the cell Terminals are formed and the terminals of the two cells are connected in series.

Next, apply epoxy resin adhesive 9 to the top of the cell.
By injecting and embedding the upper space between the unit cells communicating with each other, each unit cell is sealed, and the joint part between the upper part of the ear part 10 and the connector 11 is buried and fixed.

Effects of the invention As described above, the present invention has the following excellent effects.

(1) Since the ears of the electrode plate are made of flexible synthetic resin coated with a thin film of lead or lead alloy together with the grid, the ears, current collector plates and poles made of lead alloy, and lead Alternatively, the overall weight of the battery cannot be significantly reduced compared to conventional products equipped with connectors made of copper plated with lead alloy.

(2) Since the ears are made of flexible synthetic resin and integrated with the lattice, it is possible to take advantage of that flexibility to bend and bundle the ears of each cell and connect them directly to the connector. can. Therefore, unlike conventional products, there is no need to use a current collector plate, and there is no need to apply waveform processing to the ears, and the number of parts can be reduced because the connection can be made directly by bundling. This eliminates the trouble of connecting poles and the trouble of special processing, significantly improving production efficiency and reducing production costs.

(3) Since there is no need to weld the ears and the current collector plate, there is no need to worry about a decrease in conductivity during connection, and the yield can be improved.

(4) Since the ears are bent and connected to the connector,
The distance from the electrode plate to the connector is shorter than when a current collector plate is used, and an increase in resistance between the ear and the connector can be prevented.

[Brief explanation of the drawing]

Figure 1a is a side sectional view of a conventional lead-acid battery;
FIG. 2b is a front sectional view of the same, FIG. 2a is a side sectional view of an embodiment of the present invention, and FIG. 2b is a front sectional view of the same. 1...Battery tank, 2...Positive electrode plate (one pole),
3... Negative electrode plate (other electrode), 5... Separation plate, 6
... Current collector plate, 8, 11 ... Connector, 9 ... Adhesive, 10 ... Ear part, 12 ... Electrode group.

Claims (1)

[Scope of Claim for Utility Model Registration] A lead-acid battery comprising a synthetic resin battery cell 1, an electrode group 12, a connector 11, and an adhesive 9, wherein the connector 11 is a lead-plated metal wire such as copper. The electrode group 12 consists of an electrode plate 2 of one pole in the center, a separator 5 on both sides of the electrode plate 2, and electrode plates 3, 3 of the other pole arranged with the separator 5 in between. The board 3 is a grid body made of synthetic resin and coated with lead or a lead alloy. The electrode group 12 is housed in a synthetic resin battery cell 1, and the ears 10, 10 of the electrode plates 3, 3 of the other electrode are flexible. Connector 1
1 and embedded in an adhesive 9 filled in the upper space of a synthetic resin battery cell 1.