JPS5859559A - Paste made positive pole plate of lead storage battery - Google Patents

Abstract

PURPOSE:To prevent shortcircuit at the upper part of the group of electrodes as well as separation of active substance and thereby prolonging the cycle life by using as a retainer for said active substance a waved porous plate made of plastics such as polyorefin in addition to the grid made of lead alloy and by packaging said material with fine glass mat consisting mainly of unwoven cloth or glass fiber. CONSTITUTION:A grid 2 with tab 1 made of lead alloy with 2.5wt% antimony in the size of 100X108mm. divided into 16 sections each dimensioned as 25X23mm. is pinched by nets 3 made of polypropylene with 1.5X1.5mm. mesh, and they are pinched by polypropylene waved porous sheets 4, in the same mesh as the grid 2, of 1mm. wide and 0.5mm. thick and 0.8mm. in the height of waving in such a way that their intersections are adjusted to the center of mesh of the grid 2, whereafter these porous sheets 4 are ultrasonically welded at their intersections. An unpacked pole plate not yet chemically formed is now obtained by pasting an active substance 5 to thus prepared composite base and subjecting to preliminary drying, and the surfaces of this pole plate are pinched by polyester unwoven cloth 6 of 0.5mm. thick and their three open sides of periphery are sewed up with a thread 7 of polyester.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in paste-type positive electrode plates (referred to as -st type positive electrode plates) for lead-acid batteries,
The purpose of this is to improve the cycle life of the active material by preventing it from falling off and covering the pole group Lg.

Currently, there are a wide variety of models and applications for lead batteries, ranging from small sealed batteries to automobile batteries, power vehicle batteries, and stationary brass batteries, and they are in the highest demand among secondary batteries. . The life of a lead storage battery is often limited by the positive electrode plate, and the life of the positive electrode plate is mostly due to corrosion of the grid and softening and falling off of the active material. In particular, batteries for single-cell power vehicles such as electric cars and forklifts (used in deep discharge conditions) often reach the end of their lifespan due to the d4 of the positive electrode active material.

Mechanical means are currently being used to prevent this cypress from falling off, such as by creating a clad positive electrode plate structure in which the positive electrode active material is completely encapsulated in a glass tube or organic fiber tube, as in a clad battery. Alternatively, even in paste-type batteries, a vibration-resistant structure is adopted in which the active material of the paste-type positive electrode plate is pressed by a glass mat.

Among these, the clad type positive electrode plate is effective in suppressing the falling off of the active material and has a longer life than the paste type positive electrode plate, but it is inferior to the paste type positive electrode plate in terms of storage, and a thin electrode plate is used. It also has drawbacks such as being difficult to make and the manufacturing method being complicated.

On the other hand, although the cycle life of paste ponds using glass mats is considerably improved compared to those without glass mats, it is far less than that of clad metal ponds.

In addition, especially in recent years, there has been a strong demand to improve the 1iit efficiency of batteries, and when the ratio of the IT of the lattice body to the total IT of the active material and the lattice body becomes 60% or more in a paste-type 4-cell battery, There is a drawback that the adhesive strength between the active material and the lattice body decreases, resulting in pellet-like shedding.

The present invention has been made in view of the above points, and includes: - In addition to a lattice body made of boat δ as an active material supporting body in a Meast type positive electrode plate, a wavy plastic material such as olefin etc. In addition to the perforated plate, a plastic net with a relatively fine mesh is used, and a fine crow cloak made mainly of non-woven fabric such as polyester or glass fiber C with a diameter of 1 μm or more is completely used. Wrapping Nido 4
This reduces the softening and falling off of the active material, and also prevents short circuits in the modified E section and increases recycling life. Trying to improve dramatically. , is.

Next, one embodiment of the present invention will be described with reference to FIGS. 1 and 2. That is, when explaining the manufacturing method for the paste on the first side (C on the positive electrode plate), 3-2.6
Made of wt% antimony alloy, size is ILIL)X
In 11J8 area, 16 eyes of 23X25m+ are formed 4t
The grid body 2 with the ears 1 has a wire diameter of 0.2, 1,
J size is Lsxi, t than 5sm polypropylene
After pinching with Bruitz 5, the width is 1 x 4 or 0.
! xi tll, the height of the undulations is 0.8 fins, and the eye size is the same as that of the grid body 2 with a corrugated porous plate 4 made of polypropylene, so that the intersection of the eyes is exactly in the center of the eyes of the grid body 2. The two corrugated perforated plates 4 were sandwiched together and ultrasonically welded at their intersections. The active material 5 is sprayed onto the composite substrate prepared as above and pre-dried to obtain an unformed and unwrapped electrode plate, and the surface of the electrode plate is coated with a polyester non-woven fabric of I sandwiched it in the darkness of No. 6 and tied the three open circles with polyester thread No. 7.

Nowadays, active material outer layer (active material outer layer at first sale) is commonly used in paste-type positive electrode plates such as those mentioned above6.
4. 45, which is much higher than normal. Two types were made: one with L] and one with L. Also, without using corrugated perforated plates or nets,
4. The active material outer layer is 6.45. A conventional paste-type positive electrode plate was produced using the material of L). All of these paste-type electrode plates were equipped with a 98p active material and a 7'5F lattice. A (12V-ssAH,) battery was prototyped by combining these paste-type positive electrode plates and negative electrode plates, and was subjected to a life test based on bBh5015-1974, which is a test standard for lead storage ponds for cycle service.

In other words, this life test was performed at 8.75 A for 6 hours, and at 6.5
The capacity is rated at 80, assuming that charging for 5 hours at A is one cycle.
The life is defined as the time when r drops to 28 AM on 'j6.

The results of this life test are shown in FIG. It should be noted that batteries using a paint-type front bridge plate based on the present invention with a living matter ratio of 4.0 and 6.45 were used as batteries A-1 and J rA-2.
In addition, using conventional paste-type electrode plates with active material outer layers of 4.0i and 6.4cm, the 4-cell electrodes are designated as B-1 and B-2, respectively.

As shown in Figure 1, the life of the battery according to the present invention is far superior to that of the conventional Kamiike battery, and in particular, the life span of the battery according to the present invention is far superior to that of the conventional upper battery. I can see that it's messed up. In other words, with heavy oil using a conventional paste-type positive electrode plate with an active material of 4.0, the lifespan is only about 450 cycles at most, which is 4L, whereas the lifespan of the paste-type positive electrode plate based on the present invention is 4L. 1. Has a lifespan of nearly 500 cycles.

Using a grid body consisting of an expanded grid with a preposition of 672, the active material is superimposed by 9 By, and a plastic part with a corrugated perforated plate and a net is used. 2 is 12f! A prototype battery A-3 was manufactured using a paste-type positive electrode plate based on the present invention, which was otherwise the same as battery A-2. In addition, a battery B-3 was prototyped using a paste-type positive electrode plate that was not based on the present invention and had the same structure except that no porous skin plate or net was provided. That is, in these four ponds A-5 and B-5, the ratio of the weight of the lattice body to the total weight of the active material and the lattice body of the paste type positive electrode plate was about 27.4%. A life test was conducted on these batteries A=5 and B-6 based on 5BA5013-1974. The results at this time are shown in Figure 4.

Figure 4 shows that the effect on the performance of the battery using the paste type positive electrode plate based on the present invention is that the ratio of the weight of the lattice body to the total Jlii of the active material of the paste type positive electrode plate and the lattice body is about 25%. It can be seen that it becomes even more noticeable. That is, when this ratio becomes 25% or more, in a paste-type positive electrode plate having a conventional structure, the ability of the lattice body made of lead-alpha gold to retain the active material decreases, and the cycle life generally becomes short. On the other hand, in the battery using the paste-type positive electrode plate according to the present invention, this ratio is 2.
Even if the ratio is 5%, the cycle life is almost the same as a battery using a positive electrode plate with an ordinary grid with an IT ratio of 1. If this ratio is less than 15%, corrosion of the lattice body tends to have a negative effect on the lifespan, so this ratio should be more than 15%,
It is desirable to keep it below 60%.

In other words, according to the present invention, it is possible to obtain a paste-type kuraike with extremely low shedding of the active material. In this case, the unwrapped electrode plate is covered with a mat to seal its entire circumference. On the other hand, a conventional configuration in which the electrode plate is packaged with a bag-like separator with only the L side open has already been put into practical use, but in this configuration, the positive electrode active material, which becomes finer as the charge/discharge cycle progresses, is released during charging. Due to the generation of gas, it floats in the electrolyte, softens the remaining positive electrode active material, and deposits on the upper part of the negative electrode plate, shortening the life of the 4 cells due to short circuit.Therefore, in the present invention, the upper part of the electrode plate is By sealing the electrodes, a structure is adopted that can suppress the movement of the active material and also prevent stains on the upper part of the electrode group.

In the above example, a polyester non-woven fabric was used as the material to cover the unwrapped electrode plate, but the same effect can be obtained if a fine glass mat made mainly of glass fibers with a fiber diameter of one tone or less is used and the four peripheries are hardened with epoxy resin. You can get the following effect. Furthermore, it is also possible to adopt a method in which an unwrapped electrode plate is chemically converted and then covered with a mat.

As described above, the battery using the paste-type positive electrode plate based on the present invention has a dramatically improved cycle life compared to conventional batteries, and is considered to be particularly suitable as a positive electrode plate for batteries for battery-powered vehicles. , its industrial value is enormous.

[Brief explanation of the drawing]

! s1 and 2 are a partially cutaway front view and a side sectional view of a main part of a paste-type positive electrode plate according to the present invention, and FIGS. 6 and 4 are a lead-acid battery using a paste-type positive electrode plate according to the present invention and a conventional one. It is a comparison diagram of life characteristics with a lead-acid battery. Fig. 1 Fig. 2-4 Fig. 34 500 1000 1500 inch t cycle;

Claims (1)

[Claims] 1) The surface of an unwrapped electrode plate, in which an active material is pasted on a composite substrate in which a lattice made of lead alloy is sandwiched between corrugated plastic porous plates, is covered with a non-woven mat or glass with a fiber diameter of 1 μm or less. A paste-type positive electrode plate for a lead-acid battery, characterized in that it is covered with a fine glass mat mainly composed of fibers, and the periphery of the mat is sealed by suturing with acid-resistant thread, heat welding, or adhesion with epoxy resin. 2) The lead according to claim 1, characterized in that the lattice body is sandwiched between plastic nets having a wire diameter of 0.5 mm or less, and the lattice body is further sandwiched between corrugated perforated plates. Paste type positive electrode plate for storage batteries. 6) The paste-type positive electrode plate for a lead-acid battery according to claim 1 or 2, wherein the active material external ratio is 4.0 or more. 4) The lead-acid battery according to any one of claims 1 to 6, wherein the ratio of the weight of the lattice body to the total weight of the active material and the lattice body is 15 to 50%. Paste type positive electrode plate.