JP2001236951A - Method of manufacturing battery pole plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a transfer system failure due to variation in active material charged and warp by bonding one or more strip lead plates to a strip of three- dimensional porous metal and removing a warp in a substrate for a pole plate cut-formed later. SOLUTION: A strip lead plate 3 is bonded to a strip of three-dimensional porous metal and a portion near the lead plate is rolled between mill rolls 8. The metal is then cut to form a substrate 7 for a pole plate so that strain and distortion from pulling toward by the bonding of the lead plate 3 can be straightened. In addition, a strip of three-dimensional porous metal 1 may be rolled after bonding of a strip lead plate and then cut to form a substrate 7 for a pole plate. Or, a portion near the lead plate 3 of the substrate 7 for the pole plate formed by cutting may be rolled, or the substrate for the polar plate formed by cutting may be rolled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a battery electrode plate.

[0002]

2. Description of the Related Art For example, as a nickel hydrogen secondary battery,
The electrode group was housed together with the electrolytic solution in a rectangular parallelepiped battery case having an upper surface opening having a narrow short side surface and a wide long side surface, and the upper surface opening of the battery case was integrally closed with a lid. A plurality of positive electrode plates made of a foam metal of Ni and a plurality of negative electrode plates obtained by applying an active material in the form of a paste of a hydrogen storage alloy powder to a punching metal of Ni have been proposed. Are alternately arranged, and each positive electrode plate is covered with a bag-shaped separator made of a polypropylene non-woven fabric having an opening in the lateral direction, and is laminated with the separator interposed between the positive electrode plate and the negative electrode plate. .

Further, the positive electrode plate and the negative electrode plate are provided with a lead portion with opposite side edges protruding outward, and the lead portion of the positive electrode plate is compressed by pressurizing the foamed metal, and is provided on one surface thereof. Are joined by seam welding or ultrasonic welding, and the lead portion of the negative electrode plate is constituted by an uncoated portion of the active material. Then, on both sides of the electrode plate group, a current collector plate of a positive electrode and a negative electrode made of a nickel plate or a nickel-plated steel plate is welded and joined perpendicularly to a side edge of each lead portion.

As shown in FIG. 9, a positive electrode plate constituting the above-mentioned electrode plate group is a band-shaped lead plate having a wide Ni foam metal 11 at one or more positions in the width direction thereof at appropriate intervals. 12, the strip-shaped foamed metal 11 is cut along a cutting line 13 at an appropriate length to produce an electrode plate substrate 14 having a predetermined size as shown in FIG.
In the state of 4, the active material is filled into the foamed metal 11 and dried, and then the electrode plate substrate 14 is divided and cut.

[0005]

However, since the electrode plate substrate 14 is manufactured by joining the lead plate 12 to the foamed metal 11 and then cutting the same, as shown in FIG. Occurs greatly. The reason is lead plate 1
This is because the peripheral portion is pulled toward the joint by compressing the foamed metal 11 at the portion where 2 is joined. When the warp δ occurs in the electrode plate substrate 14 as described above, the active material is non-uniformly filled in the electrode plate substrate 14, and the occurrence rate of the variation in the filling amount becomes high. Supply and filling when filling active material,
There are problems such as an increase in the rate of occurrence of troubles in the transport system to each step such as drying and accumulation.

SUMMARY OF THE INVENTION In view of the above problems, the present invention eliminates warpage of an electrode plate substrate formed by joining one or more strip-shaped lead plates to a strip-shaped three-dimensional porous metal body, and then cutting the resultant. It is an object of the present invention to provide a method for manufacturing a battery electrode plate in which the occurrence of a trouble in a transport system due to a variation in the filling amount of an active material or a warp is prevented.

[0007]

SUMMARY OF THE INVENTION A method of manufacturing an electrode plate for a battery according to the present invention comprises joining one or more strip-shaped lead plates to a strip-shaped three-dimensional porous metal body, cutting the strips into appropriate lengths, and cutting the strips. A method for manufacturing a battery electrode plate, in which a substrate is formed, and the electrode plate substrate is filled with an active material, and then appropriately cut to produce an electrode plate having a lead portion on one side, comprising a strip-shaped lead plate. After joining, the vicinity of the lead plate is rolled, and then cut to form a substrate for an electrode plate.By rolling the vicinity of the joined lead plate, the lead plate is pulled toward the lead plate by joining the lead plate. The stress and strain that had been corrected were corrected, so that the substrate for the electrode plate formed by cutting thereafter did not warp, and the warpage of the electrode plate substrate caused variations in the filling amount of active material and troubles in the transport system. Can be prevented.

In addition, even if the strip-shaped three-dimensional porous metal body is rolled after the strip-shaped lead plate is joined and then cut to form a substrate for an electrode plate, the above-mentioned three-dimensional porous metal body is rolled as a whole. Similarly, the stress and strain generated by the joining of the lead plates are corrected, and the electrode plate substrate formed by cutting afterwards is not warped, and the same effect can be obtained.

Further, even if the vicinity of the lead plate of the electrode plate substrate formed by cutting is rolled, the stress and strain generated by the joining of the lead plates are corrected, and the warpage of the substrate is eliminated, and the same effect is exerted. .

[0010] Further, even if the electrode plate substrate formed by cutting is rolled, the warpage of the substrate is similarly eliminated, and the same effect is obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a method for manufacturing a battery electrode plate of the present invention will be described with reference to FIGS.

(First Embodiment) In FIG. 1 showing a first embodiment of the present invention, reference numeral 1 denotes a three-dimensional metal porous body such as a Ni foam metal which is a raw material of a positive electrode plate of a nickel-metal hydride secondary battery. Are formed in a wide band shape, and are supplied in the state of the coil 2. The strip-shaped three-dimensional porous metal body 1 is pulled out of the coil 2, and one or more rows (two rows in the illustrated example) of strip-shaped lead plates 3 are joined with an appropriate space in the width direction. In joining the lead plate 3, the strip-shaped lead plate 3 is continuously supplied onto the strip-shaped three-dimensional porous metal body 1, and is energized while being pressed by the roll electrode 4.
The lead plate 3 is seam-welded while compressing the three-dimensional porous metal body. Ultrasonic welding may be performed instead of or in combination with seam welding.

Next, the strip-shaped three-dimensional porous metal body 1 to which the lead plate 3 is joined is rolled by a rolling roll 5. The roll-rolling adjusts the thickness of the strip-shaped three-dimensional porous metal body 1 to a predetermined thickness, and eliminates local stress and distortion generated in the vicinity of the lead plate 3 due to the joining thereof.

Thereafter, the strip-shaped three-dimensional porous metal body 1 is cut along a cutting line 6 set at an appropriate length interval to form an electrode plate substrate 7 for manufacturing a positive electrode plate and the like. This electrode plate substrate 7
As described above, since there is no local stress or distortion at the joint portion of the lead plate 3 as described above, no warping occurs after cutting.

The electrode plate substrate 7 is supplied and filled with an active material for an active material filling step, and then dried and integrated, and then appropriately divided and cut in order to fill the active material. Then, an electrode plate such as a positive electrode plate having a predetermined shape having a lead portion on one side is formed, and supplied to a subsequent electrode plate assembly process.

When the electrode plate substrate 7 is filled with the active material, there is no possibility that a large variation occurs in the active material filling amount since the electrode plate substrate 7 does not warp. There is no such thing as trouble occurring and lowering the operation rate of the equipment.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. In the following description of the embodiment, the same components as those of the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.

In this embodiment, the strip-shaped three-dimensional metal porous body 1
After the lead plate 3 is joined to the lead plate 3, only the vicinity of the lead plate 3 is roll-rolled by the rolling roll 8. This rolling roll 8
As shown in detail in FIG. 2 (b), a strip-shaped three-dimensional porous metal body is formed which is wider than the width of the lead plate 3 and whose both sides are smoothly reduced in diameter. 1 is roll-formed so that the thickness of the lead plate 3 smoothly shifts from both side edges to a regular thickness portion.

As described above, in the present embodiment, the vicinity of the joined lead plate 3 is rolled so that the lead plate 3
The stress and strain of the strip-shaped three-dimensional porous metal body 1 in the vicinity of the lead plate 3 which have been pulled toward the lead plate 3 by the joining are corrected. Thus, no warpage is generated in the electrode plate substrate 7 formed by cutting thereafter, without changing the overall thickness of the strip-shaped three-dimensional porous metal body 1,
As in the above-described embodiment, it is possible to prevent variations in the amount of active material charged due to warpage of the electrode plate substrate 7 and occurrence of trouble in the transport system.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, after the electrode substrate 7 is formed by cutting along the cutting line 6, the electrode substrate 7 is passed through a rolling roll 5 to roll the entire electrode substrate 7.

According to the present embodiment, the local stress and strain caused by the joining of the lead plate 3 can be reliably corrected in the state of the electrode plate substrate 7 to eliminate the warpage of the electrode plate substrate 7. The same operation and effect as the above embodiment can be obtained more reliably.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, after the electrode plate substrate 7 is formed by cutting along the cutting line 6, only the vicinity of the lead plate 3 is rolled by passing the electrode substrate 7 through a rolling roll 8.

According to the present embodiment, the local stress and strain caused by the joining of the lead plate 3 can be reliably corrected in the state of the electrode plate substrate 7 to eliminate the warpage of the electrode plate substrate 7. The same operation and effect as the above embodiment can be obtained.

FIGS. 5 to 8 show specific examples of the operation and effect of each of the above embodiments in comparison with the conventional example. As shown in FIG. 5, the warpage of the electrode plate substrate 7 was 12 mm in the conventional example, but 3 mm in the first embodiment, 7 mm in the second embodiment, 2 mm in the third embodiment, In the second embodiment, the diameter is 5 mm, and a greater effect can be obtained by rolling the entire band-shaped three-dimensional metal porous body 1 or the electrode plate substrate 7 than by rolling only the vicinity of the lead plate 3, and the band-shaped three-dimensional It can be seen that the effect is greater when rolling is performed on the electrode plate substrate 7 than on the metal porous body 1. However, when the whole is rolled, the entire thickness changes, and when the whole is rolled in the state of the electrode plate substrate 7, the equipment becomes large.

FIG. 6 shows the effect of the warpage of the electrode plate substrate 7 on the equipment operation rate. The operating rate, which was about 20% in the conventional example due to large warpage, can be increased to 70 to 90% in the above embodiment.

FIG. 7 shows the effect of the warpage of the electrode plate substrate 7 on the variation in the filling amount of the active material. As shown in FIG. 8, the difference in the filling amount indicates the difference in the filling amount between the intermediate portion B in the width direction of the electrode plate substrate 7 and the warped portions C on both sides in%. Although it was 14% in the conventional example, it can be reduced to 5 to 9% in each embodiment, and the capacity variation of the battery can be reduced.

[0027]

According to the method for manufacturing a battery electrode plate of the present invention, as described above, the vicinity of the lead plate is rolled after the strip-shaped lead plate is joined, and then cut to form the electrode plate substrate. In addition, the stress and strain that have been generated by being pulled toward the lead plate by joining the lead plate can be corrected, so that the electrode substrate does not warp, and the amount of the active material due to the warpage of the electrode plate substrate can be reduced. And the occurrence of troubles in the transport system can be prevented.

Further, even if the strip-shaped three-dimensional porous metal body is rolled after the strip-shaped lead plate is joined and then cut to form a substrate for an electrode plate, the entirety of the strip-shaped three-dimensional porous metal body is rolled. Similarly, the stress and strain generated by the joining of the lead plates can be corrected, and the same effect can be obtained without causing warpage of the electrode plate substrate.

Further, even if the vicinity of the lead plate of the cut and formed substrate is rolled, the stress and strain generated by the joining of the lead plates are corrected, and the warp of the substrate is eliminated, and the same effect is obtained.

Further, even if the cut and formed substrate is rolled, the warpage of the substrate is similarly eliminated, and the same effect is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a manufacturing process of an electrode plate substrate according to a first embodiment of the present invention.

FIG. 2 shows a schematic configuration of a manufacturing process of an electrode plate substrate according to a second embodiment of the present invention, wherein (a) is an overall perspective view,
(B) is a sectional view taken along the line AA of (a).

FIG. 3 is a perspective view illustrating a schematic configuration of a main part of a manufacturing process of an electrode plate substrate according to a third embodiment of the present invention.

FIG. 4 is a perspective view illustrating a schematic configuration of a main part of a manufacturing process of an electrode plate substrate according to a fourth embodiment of the present invention.

FIG. 5 is a view showing the warp height of the electrode plate substrate in each embodiment and the conventional example.

FIG. 6 is a diagram showing an equipment operation rate in each embodiment and a conventional example.

FIG. 7 is a diagram showing variations in the filling amount of active material in each embodiment and a conventional example.

FIG. 8 is an explanatory diagram of a method for calculating a variation in the filling amount of the active material.

FIG. 9 is a perspective view showing a schematic configuration of a manufacturing process of a conventional electrode plate substrate.

FIG. 10 is a perspective view of a conventional electrode plate substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Three-dimensional porous metal body 3 Lead plate 5 Rolling roll 6 Cutting line 7 Substrate for electrode plate 8 Rolling roll

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Inoue 555 Sakaijuku, Kosai-shi, Shizuoka Prefecture Inside Panasonic EV Energy Corporation (72) Inventor Mitsugu Takagi 555 Sakaijuku, Kosai-shi, Shizuoka Prefecture Inside Panasonic EV Energy Corporation ( 72) Inventor Tokuyuki Fujioka 555 Sakaijuku, Kosai-shi, Shizuoka Prefecture Panasonic Electric Energy Co., Ltd. BB01 BB11 CC17 5H050 AA01 AA19 BA11 FA13 GA03 GA07

Claims (4)

[Claims] 1. An electrode substrate is formed by bonding one or more strip-shaped lead plates to a strip-shaped three-dimensional metal porous body, cutting the strips at an appropriate length, and filling the electrode plate substrate with an active material. A method of manufacturing an electrode plate for a battery in which an electrode plate having a lead portion on one side is cut by appropriately cutting the electrode plate. A method for producing a battery electrode plate, comprising forming a battery substrate. 2. An electrode substrate is formed by bonding at least one strip-shaped lead plate to a strip-shaped three-dimensional metal porous body, cutting the plate at an appropriate length, filling the electrode plate substrate with an active material, A method of manufacturing an electrode plate for a battery in which an electrode plate having a lead portion on one side is then cut appropriately, and then the strip-shaped three-dimensional porous metal body is rolled after joining the strip-shaped lead plate, and then cut. A method for producing an electrode plate for a battery, comprising forming a substrate for an electrode plate by heating. 3. An electrode substrate is formed by bonding at least one strip-shaped lead plate to a strip-shaped three-dimensional porous metal body, cutting the strip into an appropriate length, filling the electrode plate substrate with an active material, A method for manufacturing a battery electrode plate, which is then appropriately cut to manufacture an electrode plate having a lead portion on one side, wherein the vicinity of the lead plate of the cut and formed electrode plate substrate is rolled. A method for manufacturing a battery electrode plate. 4. An electrode substrate is formed by joining one or more strip-shaped lead plates to a strip-shaped three-dimensional metal porous body, cutting the plate at an appropriate length, and filling the electrode plate substrate with an active material. A method for producing an electrode plate for a battery, which is then appropriately cut to produce an electrode plate having a lead portion on one side, wherein the electrode plate for a battery formed by cutting is rolled. Manufacturing method.