JPS6348055Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a grid for lead-acid batteries.

Lead-acid batteries are the most widely used secondary batteries because they are easy to handle and the raw materials are relatively inexpensive, but they have the disadvantages of being heavy and having low output per unit weight. For this reason, attempts have been made to reduce the weight of batteries.
Improvements in energy density have been made through improvements in battery case materials, cell-to-cell connection methods, active materials, etc. However, even these improvements are still not sufficient, and especially in batteries for cycle service such as electric vehicles, even higher performance is required because battery performance is directly linked to vehicle performance. As a countermeasure to this problem, it has been found that using synthetic resin for part of the lattice body can improve energy density by more than 10% compared to conventional methods.

Next, a conventional method for manufacturing a lead-synthetic resin composite lattice will be described below with reference to FIG.

Since the synthetic resin part and the lead part cannot be molded at the same time, two molds are prepared: a lead lattice bone mold and a synthetic resin mold.

First, molten lead is poured into a lead lattice bone mold to form the lead lattice bone 1 portion. The shape of the lead lattice bones at this time is shown in Figure 1a.

Thereafter, this lead lattice frame is placed in a synthetic resin mold. A gap is previously provided in the synthetic resin mold to match the shape of the lead lattice frame, and the lead lattice frame is inserted into this gap and fixed. The synthetic resin that was then melted,
For example, the synthetic resin lattice frame 2 is formed by pouring polyethylene, polypropylene, etc., which have excellent acid resistance.

The lead-synthetic resin composite lattice thus produced is the lattice shown in FIG. 1b. In FIG. 1b, 1 is a lead lattice bone, and 2 is a synthetic resin lattice bone. 3 is the intersection between the lead lattice bone and the synthetic resin bone, the details of which are shown in FIG. FIG. 2a is a cross section of the intersection 3, and FIG. 2b is a partially cutaway front view. As can be seen from FIG. 2, at the intersection 3, the synthetic resin ribs 2 are molded so as to wrap around the lead lattice ribs 1, so that their positions are fixed to each other.

However, the conventional lead-synthetic resin composite lattice has the following problems.

Since lead lattice bones are molded by casting, their surfaces are not necessarily flat. Therefore, when molding synthetic resin lattice bones, minute voids inevitably form between the lead lattice bones and the resin mold. High-pressure molten synthetic resin flows out through this gap, creating tension. An example of this tension is shown at 4 in Figure 2b. When the lead-synthetic resin composite lattice is filled with an active material, this tension 4 is interposed between the active material and the lattice body, impeding electrical conduction and increasing the internal resistance of the battery. Therefore, it is necessary to remove this tension before filling the active material, but the number of intersections 3 is large, and removing the tension 4 requires a great deal of effort.

The object of the present invention is to eliminate the drawbacks of the conventional lead-acid battery lattice bodies as described above, and to obtain a lead-acid battery lattice body that is easy to manufacture and economical.

In order to achieve this purpose, the lattice body for lead-acid batteries of the present invention consists of lead lattice ribs 1 and synthetic resin lattice ribs 2 perpendicular to the lead lattice ribs 1. 1 is provided with protrusions 5, 5' surrounding the lead lattice ribs 1 in the vicinity of the intersection 3, and at the intersection 3, the lead lattice bones 1 are synthesized on the inside of the ridges 5, 5'. It consists of a structure in which it is surrounded by a resin lattice frame 2.

An embodiment according to the present invention is shown in FIG. For the sake of simplicity, the overall diagram of the grid is omitted, and only the intersection 3 is shown in an enlarged manner.

The lead-synthetic resin composite lattice according to the present invention has the following features:
Shape lead lattice bones by casting. At this time, unlike the conventional method, the shape of the lead lattice bone mold is changed to provide protrusions 5 shaped to surround the lead lattice bones 1 near the intersections 3. The protrusions 5 are provided on both sides of the intersection 3.

The intersection 3 of the lead lattice bones formed in this manner is shown in FIG. 3a.

The resulting lead lattice frame is then placed into a synthetic resin mold. At this time, the synthetic resin mold has protrusions 5
Do not provide a gap corresponding to For this reason, when the lead lattice ribs are placed in a synthetic resin mold and the synthetic resin mold is tightened and pressurized, the protrusions 5 are crushed by the synthetic resin mold, and the intersections 3 The air gap near the area will be completely filled. After this, the synthetic resin is poured in, but since the protrusion 5 is crushed, there is no gap between the protrusion 5 near the intersection 3 and the synthetic resin mold, so the synthetic resin flows in under high pressure. The flow is completely blocked in this part and does not flow beyond the protrusion 5 to the outside.

As a result, the occurrence of tension, which was a problem with conventional lead-synthetic resin composite grids, is completely eliminated. This state is shown in FIG. 3b. In FIG. 3, 5' indicates the protrusion 5 that has been crushed by the synthetic resin mold.
Reference numeral 4 indicates tension, but unlike conventional lead-synthetic resin composite grids, the tension is prevented by the protrusions 5.

As is clear from the above, according to the present invention, unnecessary tension is not generated and work efficiency is significantly improved.

[Brief explanation of drawings]

Figure 1 shows the configuration of a conventional lead-synthetic resin composite lattice; Figure 1a is a front view thereof, and Figure 1b shows only the lead lattice bones of the conventional lead-synthetic resin composite lattice. Figures 2 and 2 are enlarged views of the intersections between lead lattice bones and synthetic resin lattice bones in a conventional lead-synthetic resin composite lattice.
Figure b is a front view of the intersection 3, Figure 3 is an explanatory diagram of an embodiment of the lead-synthetic resin composite lattice according to the present invention, and Figure 3a is the intersection of the lead lattice bones before molding the synthetic resin lattice bones. Figure 3b is an enlarged view showing the intersection between the lead lattice bone and the synthetic resin lattice bone after molding the synthetic resin lattice bone. It is a diagram. 1...Lead lattice bone, 2...Synthetic resin lattice bone, 3...
...intersection, 4... tension, 5... ridge, 5'... ridge that has been crushed and shaped.

Claims (1)

[Claims for Utility Model Registration] It has lead lattice bones 1 and synthetic resin lattice bones 2, the lead lattice bones 1 and the synthetic resin lattice bones 2 each have an intersection 3 in the middle, and both lattice bones 1 ,2
A plurality of lead lattice bones 1 are arranged in parallel, and protrusions 5 and 5' surrounding the lead lattice bones 1 are formed on both sides of each intersection 3, and the lead lattice bones 1 and the synthetic resin lattice A lattice body for a lead-acid battery, characterized in that the bones 2 are orthogonal to each other and connected at intersections 3, and the connection is such that the synthetic resin lattice bones 2 surround the lead lattice bones 1.