JPS6329449A - Electrode plate for storage battery - Google Patents

Abstract

PURPOSE:To improve the high rate discharge property and to reduce the weight of a cell, by using a paste added with porous substances. CONSTITUTION:A porous substance 1 such as a synthetic fiber or a glass fiber is made into a sheet to produce a separator plate for automobile, crushed into about one mm pieces, and added to a paste 2 at 0.5 to 5 wt.% to 1 kg of the paste. If the scope of the value is too smaller, the effect is lost, and if it is too larger, the electric resistance is increased resulting in an inverse effect at the time to make it into the electrode plate. At the same time, the paste 2 is dried up crisp and its filling property is lost. Therefore, 1 % is preferable as the ideal adding ratio of the porous substance. By adding 1 %, the porousness is increased about 10 %, and the maintaining time of the high rate discharge at the same weight is improved about 17 %. Furthermore, when the high rate discharge property is kept at the same condition, the weight of the cell can be reduced about 20 %.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in electrode plates for storage batteries.

Conventional technology Conventional automatic heavy-duty storage batteries are broadly classified according to their purpose of use, such as series f, which are used for relatively long periods of time under low load, such as C light.
It is conceivable to use rapid discharge, which discharges a large current in a short period of time, such as for f12 and when starting an engine.

In the case of the series electric current mentioned above, since the discharge is at a low current, the supply of sulfuric acid is relatively smooth during the discharge, but in the case of a sudden discharge, the supply of sulfuric acid cannot keep up with the current taken out. , a state of sulfuric acid deficiency occurs, causing a voltage drop and making it impossible to maintain the characteristics.

To deal with this, the method is to reduce the current density of the current taken out by increasing the surface area of the electrode plate, or to increase the amount of sulfuric acid held in the electrode plate by reducing the particle size of the lead powder used to make it porous. Methods of increasing the degree of oxidation have been considered.

Problems to be Solved by the Invention In this method, the strength of the active material decreases, which causes the active material to fall off early during use, resulting in a shortened lifespan.

Means for Solving the Problems In view of the above-mentioned point 1, the present invention incorporates a porous material having liquid-retaining properties into the paste during paste production.

action High rate discharge characteristics are improved and battery weight is reduced.

Example Pre-prepared porous material 1 An automobile separator made of synthetic fiber, glass fiber, etc., is ground into pieces of approximately 1 square inch, and the weight ratio of the porous body 1 is 0.5% to 5% by weight to the lk) of paste 2. Add lead. If this numerical value range is too small, the effect will be small, and if it is too large, the electrical resistance will increase when used as an electrode plate, which will immediately have the opposite effect. Therefore, the ideal amount to add is one winter. The reason is that with the addition of 1 liter, the porosity is approximately
0, and its properties improve by about 17 mm for the duration of high rate discharge at the same weight.

In the above embodiment, an automobile separator was used as the porous body 1, but it may also be made of twisted glass fibers.

In this case, care should be taken not to increase the size of the added chips. If it is too large, the filling properties of the paste 2 will be impaired when it is filled into the substrate 3, so a suitable range is 1 m to 5 m.

In order to improve the characteristics during high rate discharge, it is effective to increase the porosity of the electrode plate and increase the amount of replacement fluid, but in order to avoid shortening the service life, it is effective to If paste 2 is prepared by adding and kneading a porous material with excellent liquid retention properties such as paper or glass wool during the production of paste 2, paste 2 with large porosity can be created without impairing the adhesion of paste 2. can be produced. Here, if the amount of porous material 1 added is too large, it will absorb too much water and increase the electrical resistance. Furthermore, the ability to fill the substrate 3 will be impaired.

In addition, in the present invention, when the high rate discharge characteristics are kept the same, the weight of the battery can be reduced by about 20%.

Next, Figure 2 shows the results of comparing the high rate discharge characteristics of storage battery A using the electrode plates obtained according to the present invention and storage battery B using conventional electrode plates at 150A discharge (-15°C). shows. As is clear from FIG. 2, it can be seen that the storage battery B using the electrode plate obtained according to the present invention is superior to the storage battery B using the conventional electrode plate.

4 is an external bone, and 5 is an internal bone.

As described above, according to the present invention, the high rate discharge characteristics of the storage battery can be improved, and the weight of the storage battery can be reduced, which has great industrial value.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main part of the electrode plate according to the present invention, and Figure 2 is a comparison of high rate discharge characteristics between a storage battery using the electrode plate obtained by the present invention and a storage battery using a conventional electrode plate. It is a diagram. l is porous body, 2 is paste

Claims (1)

[Claims] 1. An electrode plate for a storage battery characterized by using a paste containing a porous substance. 2. The electrode plate for a storage battery according to claim 1, in which a porous material is added in a weight ratio of 0.5 to 5%.