JPH03155057A - Vent type storage battery plate, manufacture thereof and vent type storage battery - Google Patents

Abstract

PURPOSE:To prevent lowering of intermediate discharge voltage and capacity performance by gradually thinning from the lower end to the upper end, the thickness of the plate of at least one polarity of nose of an anode plate and a cathode plate and forming at least one of both plates into an upward inclined plane. CONSTITUTION:The wall thickness of an anode plate 1 is gradually thinned from its lower end to its upper end, and its both sides are formed, into the center plane of the thickness of the plate, in other words, upward inclined planes 1a, 1a approaching although to a small extent to the plane of the porous core metal plate (a) of the plate as the planes of both sides of the anode plate 1 go upward. Even if the upper portion of the plate 1 is therefore curved while it is used due to the inclined planes 1a, 1a, the pushing pressure against a separator is so gentle that the separator is never compressed. It is thereby possible to prevent degassing by curving the upper part of of the plate 1, eliminate latent remainder of gas and increase in an internal resistance between plates, and prevent lowering of intermediate discharge voltage and capacity performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrode plate for a bent type battery, a method for manufacturing the same, and a bent type storage battery.

[Conventional technology]

A conventional vented storage battery is constructed by housing a group of electrode plates, in which an anode plate and a cathode plate are laminated with a separator in between, in a vented battery container, and a predetermined amount of electrolyte is injected into the container. Therefore, the battery operates in such a way that the gas generated within the electrode plate group is released into the space above it and exhausted through the exhaust hole provided in the battery cover, but the separator is not attached to the electrode plate. A material made of non-woven fabric is preferably used in order to easily discharge the generated gas.

[Problem to be solved by the invention]

However, during its use, the bent type storage battery has a large number of electrodes that form the electrode group. ! Since the electrode plate, cathode plate, or both electrode plates are in strong pressure contact with the separator surface, it is difficult for the gas generated from the electrode plate to escape upward. This often causes a phenomenon in which the upper part of the separator surface is compressed particularly strongly, and therefore it becomes particularly difficult for the debris generated from the electrode plates to escape upward. Therefore, in general, in conventional vented storage batteries equipped with such a group of electrode plates, gas accumulates on the surface of the horizontal plates and forms ribs, resulting in an increase in internal resistance between the plates, which increases the discharge intermediate voltage and capacity. This had the disadvantage of causing a significant drop in performance.

[Means to solve the problem]

The present invention provides an electrode plate for a bent type battery that can eliminate the conventional drawbacks, and the predominant thickness of at least one of the anode plate and the cathode plate is changed from the lower end to the upper end. ζ
It is made by making the stone thinner and forming at least one of its surfaces into an upwardly sloping surface.

Furthermore, a second invention provides a method for manufacturing an electrode substrate for a bent type storage battery, which enables the electrode plate of the invention described above to be manufactured with high efficiency, in which both sides of a long strip-shaped core metal plate, After applying a slurry consisting of metal powder for sintering and a thickening agent, at least one side of the core plate is heated at a certain angle to both sides of the core metal plate.
It is characterized by passing through a tapered slit formed between a pair of inclined scraping blades which are arranged diagonally opposite each other.

A third aspect of the present invention provides a vented storage battery which eliminates the above-mentioned conventional drawbacks, and includes a battery container containing a group of electrode plates assembled using the electrode plates according to claim 1.

[For production]

When a lithium battery is manufactured by assembling a group of electrode plates using the electrode plates of the present invention and storing the same in a battery container, the electrode plate becomes thinner toward the upper end. At least one surface of the electrode plate is pre-formed into an upwardly inclined surface that gradually weakens the pressure contact with the opposing surface of the separator as it reaches the upper end, so that gas generated on the electrode plate can easily escape upward. Due to the inclined surface, even if the upper part of the electrode plate is bent during use, the pressure against the separator is gentle;
Since it is not compressed, degassing due to the upper curvature of the electrode plate is prevented by the degree of inclination with respect to the conventional vertical plane, eliminating gas retention and reducing the internal space between the electrode plates as seen in conventional vented storage batteries. It is possible to prevent an increase in resistance and a significant decrease in discharge intermediate voltage and capacity performance.

Furthermore, the method for producing the electrode of the present invention, which is used to produce an electrode plate that recurs, includes applying sintering metal powder and adhesive on both sides of a long strip-shaped core metal plate.
When a material coated with a slurry consisting of fy1 scraping is passed through the above-mentioned tapered slit, at least one of the coated surfaces is scraped by a pair of opposing scraping blades with at least one of them tilted ♂1. Follow the sloping blade,
Since it is scraped off on an inclined surface, a tapered electrode substrate with at least one surface having a predetermined inclined surface is obtained, and then an active material filling treatment is performed by a conventional method to obtain an electrode plate of the present invention.

〔Example〕

Next, the most preferred embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 shows an anode plate 1 for a vented storage battery according to an embodiment of the present invention. The central plane of the thickness of the plate, in other words, its porous core plate a
These are formed on the surfaces 1a, 1a with an upward tendency toward the surface.

In other words, it is formed into a tapered electrode plate 1 having upwardly inclined surfaces 1a, 1a on both sides.

An example of the degree of inclination is that the thickness of the lower end is 0.9 mm, the thickness of the upper end is 0°711I11, and the middle part is 0.9 mm. The electrode plate 1 has a tapered shape of amm. In this way, the electrode plate 1 is configured to have a high energy density that is the same as the active material filling density, that is, the amount of active material, that a conventional electrode plate has, which is composed of both mutually parallel vertical sides with a thickness of 0.8 am from the bottom end to the top end. can.

FIG. 2 shows the anode plate 1 of the present invention constructed as described above.
An electrode plate group 4 assembled using three tapered cathode plates 2 of the present invention having sloped surfaces 2a, 2a configured in the same manner as above and with a separator 3 interposed between them is placed in a battery case 5.
An anode terminal column 9 is fixedly housed in the battery case, an electrolytic solution 6 is injected therein, and a battery plate 7 is firmly attached to the top surface of the opening of the battery case. are connected to each other via lead wires, and each of the electrodes Pi1. The ears of W and 2 are l? which pass through the other side of the battery cover 7. It is similarly connected to a three-pin terminal post (not shown), and has an exhaust hole in the middle part of the battery cover 7. Note that the exhaust hole may be provided with a catalyst plug, as is the case with the prior art. The separator 3 consists of a gas barrier film 3a made of cellophane or the like at the center and nonwoven fabrics 3b made of nylon or the like polymerized on both sides sandwiching the gas barrier film 3a.

The tapered cathode plate 2 of the present invention, like the tapered anode plate 1 of the present invention described above, has a porous metal core plate a at the center, and its thickness is 0.9 mm at the lower end. Upper t4A0.7ra
t+, sloped surface 2 with both sides facing upward with a thickness of 0.8 degrees in the middle part
It is shaped like a, 2a. Both ends of the electrode plate group 4 and the battery case 5
A spacer 10.10 is interposed between the opposite side wall of the electric w! The electrode plate group 4 is immovably pressed into the inside of the electrode plate 5 .

In the vented storage battery of the present invention constructed in this way, the anode plate 1 and the cathode plate 2 constituting the electrode plate group 4 have upwardly inclined surfaces 1a, 1a, 2b, and 2b on both surfaces, respectively. The separator 3 intervening during this time is
As the clamping force of these two electrode plates gradually weakens from the lower end to the upper end, the gas generated on these horizontal plates during charging and discharging can escape upward along the three surfaces of the separator relatively easily. . Moreover, even if the upper part of the electrode plate 1 or 2 is curved, the electrode plate 1.2 will not fit the separator 3.
Inclined surfaces 1a, 1a, 2b facing upward in a direction away from the surface
, 2b, the upper part of the electrode plate 1.2 is prevented from compressing the separator surface by the degree of inclination thereof, and degassing is prevented as much as possible.

Therefore, the degree of upward inclination is set as desired.

As described above, in the vented storage battery of the present invention, the gas generated within the electrode plate group can easily escape into the space above the electrode plate group, thereby preventing the gas from accumulating and deteriorating the discharge performance.

In the embodiment of the M battery described above, both the anode plate and the cathode plate were constructed of the plate 1.2 of the present invention, but one of the opposing horizontal plates could use a conventional cathode plate or anode plate. Of course, the use of the anode plate 1 or the cathode plate 3 of the present invention has the above gas retention prevention effect.

Next, an example of an apparatus for implementing the manufacturing method of the present invention for efficiently manufacturing the above-mentioned electrode plate 1 or 2 of the present invention will be described with reference to FIGS. 3 and 4.

In the drawings, reference numeral 11 indicates a supply roll around which a long strip-shaped porous metal core plate a is wound, and reference numeral 12 indicates a slurry tank containing slurry b, for example, slurry b consisting of nickel hydroxide powder and an aqueous solution of 8 groups such as CHC. Reference numeral 13 denotes a pair of inclined scraping blades 15 which are disposed opposite to each other and formed around the tapered slit 14 of the present invention horizontally installed above the slurry tank 12.
16 is a regulating plate that guides the remaining ends on both sides of the core metal plate;
A pair of left and right connecting plates connecting both blades 13.13, 1
7 is a fixing screw, and 18 is a guide roll. The slurry b is the same as the conventional one, and is a mixture of sintering metal powder such as nickel powder and an aqueous solution of a viscous l171 agent such as CMC.

The pair of inclined blades 13.13 are arranged opposite each other as clearly shown in FIG. That is, for both sides of the belt-shaped cored metal plate a passing through the center of the tapered slit 14, both inclined surfaces 1a, 1a or 2a, 2a of the predetermined tapered anode plate 1 or cathode plate 2 to be manufactured are formed. In order to form
They are arranged so that they are inclined at the same angle of inclination and face each other so as to form a tapered slit 14 therebetween.

In order to manufacture the electrode substrate of the present invention using the electrode substrate manufacturing apparatus configured as described above, the elongated strip-shaped porous core metal plate a is drawn out from the supply roll 11 using a pulling roll (not shown) in a conventional manner. Then, it is introduced into the slurry tank 12 via the guide roll 18 and moved vertically upward, and the core metal plate a is filled with the slurry b from both sides and passed through the tapered slit 14 of the present invention. When applying the slurry, a pair of opposing inclined blades 13.13 on both sides of the slurry-applied NXIb can
3.13, an electrode substrate material consisting of a tapered slurry coating layer scraped and formed on a predetermined inclined surface bb is obtained. This is then introduced into an incinerator to form a predetermined surface. A sintered electrode substrate in the form of a long strip with six inclined surfaces is cut into a predetermined size by a conventional method, and the remaining ends on both sides are trimmed leaving ears 8 to obtain a sintered electrode substrate in the shape of an electrode plate. Make it unpleasant. Next, the anode plate 1 of the present invention is produced by impregnation with an anode active material using a conventional method, or the cathode plate 2 of the present invention is produced by impregnation with a cathode active material.

The above embodiment shows the case where both sides of each polar plate of the negative and positive standing plates are formed into inclined surfaces, but as can be easily understood from the above, at least one side of each horizontal plate is formed into an inclined surface. However, it goes without saying that the inclined surface provides similar effects and the object of the present invention is achieved.

〔Effect of the invention〕

In this way, according to the present invention, the tapered electrode plate is made thinner from the lower end to the upper end, and at least one surface is formed as an upwardly inclined surface, so that the anode plate and the cathode plate are When assembling a plate group together with a separator using at least one of them in a conventional manner and storing this in a battery case to form a vented storage battery, the gas generated within the plate group should be removed from above the plate group. A vented storage battery is obtained in which the gas can be easily discharged to the electrode plate group, thereby eliminating the accumulation of gas in the electrode plate group, and thus maintaining good discharge performance. In addition, the manufacture of the electrode substrate of the horizontal plate is carried out by a pair of Ii
At least one of the L-shaped blades is an inclined blade,
Inside the tapered slit formed between the grades,
Since it passes through a long porous metal core plate having slurry coating layers on both sides, it is possible to continuously manufacture electrode substrates having predetermined slopes on both sides.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an electrode plate according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a vented storage battery according to an embodiment of the present invention, and FIG.
The figure is a side view of an example of a manufacturing apparatus for carrying out the method of manufacturing an electrode plate substrate of the present invention, and FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3. 1... Anode plate of the present invention 1a, la... Inclined surface 2
... Cathode plate of the present invention 2a, 2a... Inclined surface 13
, 13...Pair of inclined blades 14...Tapered slit Fig. 1

Claims (1)

[Scope of Claims] 1. A vent comprising at least one polarity of an anode plate and a cathode plate, whose thickness is gradually reduced from the bottom end to the top end, and at least one surface thereof is formed into an upwardly inclined surface. Electrode plates for storage batteries. 2. After applying a slurry consisting of sintering metal powder and a thickening agent to both sides of a long strip-shaped core metal plate, at least one of them is tilted at a constant angle with respect to both sides of the core metal plate. 1. A method for producing an electrode for a vent-type storage battery, characterized by passing the electrode through a tapered slit formed between a pair of inclined scraping blades arranged oppositely. 3. A vented storage battery comprising a battery container containing a group of electrode plates assembled using the electrode plates according to claim 1.