JPH0145094Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a lead-acid battery electrode plate substrate formed by a machining method.

Traditionally, lead-acid battery electrode plates have been manufactured using lead or lead alloy casting methods, but recently there has been a demand for maintenance-free storage, and at the same time, storage batteries are required to be lighter, have higher performance, and have a longer lifespan. As a result, machining methods are attracting attention as an alternative to casting methods, and progress is being made in their development and practical application. The feature of this machining method is that it uses a thin sheet of lead or lead alloy.
It is possible to manufacture thin substrates with a thickness of 1 mm or less, which was extremely difficult to manufacture using the casting method, and for the purpose of maintenance-free lead alloys, we have developed low antimony-lead-based alloys and lead-based alloys with low antimony content. Lead-calcium-tin alloys containing calcium, tin, aluminum, etc. are mainly used. However, since these lead alloys have relatively poor mechanical strength, grid substrates formed from these alloys may expand due to volume changes or corrosion of the active material during use of the storage battery, and may cause electrical contact with the active material. However, there were disadvantages such as a short life due to short circuits between the positive and negative electrode plates.

In addition, substrate grids that use lead or lead alloys in combination with synthetic resin have appeared. For example, in order to reduce weight, a grid body with window holes and protrusions is formed on a thin plate of lead or lead alloy. Then, fill the concave part on the opposite side of the protruding part of this lattice body with synthetic resin,
An electrode plate filled with an active material between the window holes and the protruding parts was proposed in Japanese Patent Publication No. 47-45770, and in order to improve the performance, especially the mechanical strength of the board, recesses were added to the grid board made of pure lead. Japanese Patent Publication No. 48-40927 proposes a storage battery lattice body in which a lattice body is pressure-formed with a roller that is heated after a heat-meltable synthetic resin is flowed into the groove part and provided with a groove part having a hole communicating with the lattice body. .

However, in such an electrode plate, a groove provided in the frame of the substrate is filled with synthetic resin in a smooth manner. Therefore, the amount of lead or lead alloy reduced is only limited to the amount of synthetic resin filled in the groove of the frame. Furthermore, in order to make the electrode plate thicker, a thicker substrate must be used, and although the mechanical performance is improved, the drop-off of the active material is no different from that of conventional substrates.

The present invention was developed as a result of extensive research in view of the current situation, and the discovery of a substrate for lead-acid battery electrode plates that allows thick electrode plates to be formed using a substrate with a small amount of lead and that can prevent the active material from falling off. That is, the present invention is a board for a lead-acid battery consisting of a lattice, the lattice being machined from a thin plate made of lead or a lead alloy, and at least a pair of outer frames 3 and 4 formed therein. The at least one pair of outer frames 3 and 4 are provided with grooves 7 and 8, and the grooves 7 and 8 are filled and solidified with synthetic resin 2, and the synthetic resin 2 is formed in the outer frame. This is a lead-acid battery electrode plate substrate characterized by protruding from the surfaces of 3 and 4.

The present invention uses lead and a synthetic resin together as the outer frame of the board, makes the surface of the synthetic resin uneven, and makes the synthetic resin higher than the surface of the lead board, thereby increasing the shear resistance between the lead and the synthetic resin as much as possible. At the same time, it is characterized in that a thick electrode plate can be obtained from a thin substrate. That is, by making the thickness of the pre-formed outer frame thicker than the substrate surface using synthetic resin, the active material is applied to the substrate surface to coat the electrode plate, and the active material is applied to the height of the outer frame. Since it can be painted, the total amount of lead can be reduced by controlling the total thickness of the electrode plate and making the grooves in the outer frame shallower.

In the present invention, in order to improve the shear resistance of the outer frame of the board, irregular uneven parts A, spiral grooves B, and regular uneven parts C are formed on the surface of the synthetic resin as shown in Fig. 1. The surface is made uneven.

Further, the filling state of lead or lead alloy 1 and synthetic resin 2 in the groove of the outer frame of the substrate is illustrated as shown in FIGS. 2A to 2E.

In this case, the height of the bulge of the synthetic resin is not particularly limited.

By doing so, the shear resistance between the lead and the synthetic resin of the outer frame increases, and elongation of the lead portion can be suppressed, thereby preventing the active material from falling off.

In the present invention, the synthetic resin to be filled into the groove provided in the outer frame may be injected into the groove and then cured, or a pre-formed resin may be fitted into the groove. A cold injection type epoxy resin or the like is used.

In addition to the case where the groove is formed by curving the outer frame, the groove may be formed by cutting the surface of the outer frame.

Next, embodiments of the present invention will be described.

Embodiment (1) FIG. 3A is a plan view of an expandable board formed from a thin sheet of calcium-lead alloy by an expanding method, in which 3 is an upper outer frame, 4 is a lower outer frame, 5 is a lug, 6 is a strand, 7 is a groove in the upper outer frame, 8 is a groove in the lower outer frame, and 9 is a space filled with an active material, and the strands 6 form a diagonal lattice shape as a whole.

The grooves 7 and 8 are each formed by curving the outer frame, so the opposite side (back surface) thereof is convex.

After this, a synthetic resin surface having irregularly uneven portions as shown in FIG. and filled it. The cross section of the upper groove 7 is shown in FIG. 3B, and the cross section of the lower groove 8 is shown in FIG. 3C. It stands out like a rising ivy.

As a result of charging and discharging lead-acid batteries using the inventive board and the conventional board, and measuring the average value of the lateral elongation of the board after 10 cycles, it was found that the conventional product
Compared to 3.2, the product of the present invention showed an extremely small value of 1.1.

Example (2) FIG. 4 is a plan view of a board formed from a thin sheet of calcium-lead alloy by the punching method.
is the upper outer frame, 11 and 13 are the side outer frames, 12 is the lower outer frame, 14 is the ear, 15 is the groove in the upper outer frame, 1
Reference numeral 6 denotes a groove in the lower outer frame, 17 a vertical midrib, and 18 a horizontal midrib. The vertical midrib 17 and the horizontal midrib 18 form a lattice-like structure as a whole.

Note that the grooves 15 and 16 and the grooves 19 and 20 of the side outer frames 11 and 13 are formed by curving the outer frame, respectively, so that the opposite side (back side) thereof is convex.

After doing this, the respective grooves 15, 16, 1
9 and 20 were filled with a synthetic resin whose surface was formed into irregular irregularities as shown in FIG. 1A by fitting and press-bonding.

The cross section of the upper groove 15 is shown in FIG. 4B, and the cross section of the lower groove 16 is shown in FIG. 4C.
The synthetic resin 2 is used as the outer frame 10 and the outer frame 1, respectively.
It protrudes upward from the surface of 2.

Furthermore, the synthetic resin 2 fitted and press-bonded into the side grooves 19 and 20 also protrudes in the same manner.

As a result of charging and discharging the lead-acid batteries with the proposed board and the conventional board, and measuring the average value of the longitudinal elongation of the board after 15 cycles, the results showed that the average value of the vertical elongation of the board was extremely small, as compared to 7.4 for the conventional product and 2.1 for the invented product. showed that.

As detailed above, the lead-acid battery electrode plate substrate of the present invention has excellent mechanical strength and has extremely low elongation, which prevents the active material from falling off and prevents a decrease in battery capacity or a short circuit between the positive and negative electrode plates. Since it can be prevented as much as possible, it has remarkable effects such as being able to be used for a long time.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one example of the surface of the synthetic resin to be filled into the groove provided in the outer frame in the present invention;
The figure is a sectional view showing an example of a state in which the lead or lead alloy of the outer frame is filled with synthetic resin in the present invention, Figure 3A is a plan view of the expanded method of the present invention, and Figure 3B is the same as Figure 3A. Figure 3C is a cross-sectional view taken along line A-A' in Figure 3;
Figure A is a plan view of the punching method of the present invention, Figure 4B
is a sectional view taken along line A-A' in Figure 4A, Figure 4C
is a sectional view taken along line B-B' in FIG. 4A. 1...Lead alloy, 2...Synthetic resin, 3,10...
Upper outer frame, 4, 11... Lower outer frame, 5, 14...
Ears, 6... Strands, 7, 8, 15, 16,
19, 20...concave groove, 9...active material filling space,
11, 3... Side outer frame, 17... Vertical mid-bone, 18...
...lateral midbone.

Claims (1)

[Claims for Utility Model Registration] A board for a lead-acid battery consisting of a lattice, the lattice being machined from a thin plate made of lead or a lead alloy, and at least a pair of outer frames 3 and 4 formed therein. The at least one pair of outer frames 3 and 4 are provided with grooves 7 and 8, and the grooves 7 and 8 are filled and solidified with synthetic resin 2, and the synthetic resin 2 is A lead-acid battery electrode plate substrate characterized by protruding from the surfaces of outer frames 3 and 4.