JP4473396B2 - Manufacturing method of battery electrode plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a battery electrode plate.
[0002]
[Prior art]
For example, as a nickel metal hydride secondary battery, an electrode plate group is accommodated together with an electrolyte in a rectangular parallelepiped battery case having a narrow short side surface and a wide long side surface, and the upper surface opening of the battery case is An electrode plate group that has been integrally closed with a lid has been proposed. The electrode plate group is composed of a plurality of positive electrode plates made of Ni foam metal and an active material obtained by pasting hydrogen punching alloy powder into Ni punching metal. A plurality of coated negative plates are alternately arranged, and a separator is interposed between the positive plate and the negative plate by covering each positive plate with a bag-like separator made of a polypropylene nonwoven fabric having openings in the lateral direction. It is configured by stacking in a state.
[0003]
In addition, the positive and negative electrode plates are provided with lead portions with the opposite side edges protruding outward, and the lead plate pressurizes and compresses foam metal and seams the lead plate to one side In addition, 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 positive electrode and a negative electrode current collector plate made of a nickel plate or a nickel-plated steel plate are welded and joined perpendicularly to the side edges of the lead portions.
[0004]
As shown in FIG. 9, the positive electrode plate constituting the electrode plate group is bonded to a strip-like wide Ni foam metal 11 with a strip-like lead plate 12 at an appropriate interval in one or more places in the width direction. Then, the strip-shaped foam metal 11 is cut along cutting lines 13 at appropriate lengths to produce a substrate 14 for a predetermined size as shown in FIG. The foam metal 11 is manufactured by filling and drying the active material, and then dividing and cutting the electrode plate substrate 14.
[0005]
[Problems to be solved by the invention]
However, since the electrode plate substrate 14 is manufactured by bonding the lead plate 12 to the foamed metal 11 and then cutting, as shown in FIG. This is because the foam metal 11 is compressed at the portion where the lead plate 12 is joined, and the peripheral portion is pulled toward the joined portion. When warping δ occurs in the electrode plate substrate 14 in this way, the active material is non-uniformly filled into the electrode plate substrate 14, the occurrence rate of filling amount variation failure is increased, and the electrode plate substrate 14 is On the other hand, there is a problem that the occurrence rate of troubles is increased in the transport system for each process such as supply, filling, drying, and stacking when filling the active material.
[0006]
In view of the above-described conventional problems, the present invention eliminates warping 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 lead plate. It aims at providing the manufacturing method of the electrode plate for batteries which prevented generation | occurrence | production of the trouble of the conveyance system by the dispersion | variation of a filling amount, and a curvature.
[0007]
[Means for Solving the Problems]
The method for producing a battery electrode plate according to the present invention comprises joining one or more belt-like lead plates to a belt-like three-dimensional metal porous body and then cutting the electrode plate at an appropriate length to form an electrode plate substrate. Is a method for manufacturing a battery electrode plate that is appropriately cut and thereafter cut to produce an electrode plate having a lead portion on one side, and the vicinity of the lead plate is rolled after joining the strip-shaped lead plate. Then, it is cut to form a substrate for an electrode plate, and the stress and distortion generated by being pulled toward the lead plate by joining the lead plate by rolling the vicinity of the joined lead plate are corrected, Therefore, warpage does not occur in the electrode plate substrate formed by subsequent cutting, and it is possible to prevent variations in the amount of the active material filled due to warpage of the electrode plate substrate and troubles in the transport system.
[0008]
In addition, even if the strip-shaped three-dimensional metal porous body is rolled after joining the strip-shaped lead plate and then cut to form the electrode plate substrate, the lead is formed in the same manner as described above by rolling the entire strip-shaped three-dimensional metal porous body. The stress and distortion generated by the joining of the plates are corrected, and the electrode plate substrate formed by cutting thereafter is not warped, and the same effect can be obtained.
[0009]
Further, even if the vicinity of the lead plate of the electrode substrate formed by cutting is rolled, the stress and distortion generated by joining the lead plates are corrected, and the substrate is not warped.
[0010]
Moreover, even if the electrode plate substrate cut and formed is rolled, the substrate is similarly warped, and the same effect can be obtained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment of the manufacturing method of the battery electrode plate of the present invention will be described with reference to FIGS.
[0012]
(First embodiment)
In FIG. 1 showing the first embodiment of the present invention, reference numeral 1 denotes a band-shaped three-dimensional structure in which a three-dimensional metal porous body such as a foam metal of Ni, which is a raw material of a positive electrode plate of a nickel metal hydride secondary battery, is formed in a wide band shape. It is a metal porous body and is supplied in the state of the coil 2. The strip-shaped three-dimensional metal porous body 1 is pulled out from the coil 2, and one or a plurality of (two rows in the illustrated example) strip-shaped lead plates 3 are joined with a suitable 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 metal porous body 1, energized while being pressed by the roll electrode 4, and the lead plate 3 is compressed while compressing the three-dimensional metal porous body. The seam is welded. Ultrasonic welding may be performed instead of or in combination with seam welding.
[0013]
Next, the strip-shaped three-dimensional metal porous body 1 to which the lead plate 3 is bonded is rolled by a rolling roll 5. The roll-shaped rolling adjusts the thickness of the band-shaped three-dimensional metal porous body 1 to a predetermined thickness and eliminates local stresses and distortions generated in the vicinity due to the joining of the lead plate 3.
[0014]
After that, the strip-shaped three-dimensional metal porous body 1 is cut along cutting lines 6 set at appropriate length intervals to form an electrode plate substrate 7 for manufacturing a positive electrode plate or the like. Since the electrode plate substrate 7 does not have local stress or distortion at the joint portion of the lead plate 3 as described above, it does not warp after cutting.
[0015]
This electrode plate substrate 7 is then supplied toward the active material filling step to be filled with the active material, filled with the active material, then dried, integrated, and further appropriately divided and cut. An electrode plate such as a positive electrode plate of a predetermined shape having a lead portion on the side is formed and supplied to the subsequent assembly process of the electrode plate group.
[0016]
When the electrode plate substrate 7 is filled with the active material, the electrode plate substrate 7 is not warped, so there is no risk of large variations in the filling amount of the active material, and trouble occurs in the conveyance system during that time. And there is no such thing as lowering the equipment availability.
[0017]
(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 in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and only differences will be described.
[0018]
In this embodiment, after the lead plate 3 is joined to the band-shaped three-dimensional metal porous body 1, only the vicinity of the lead plate 3 is roll-rolled by the rolling roll 8. As shown in detail in FIG. 2 (b), the rolling roll 8 is composed of a roll that is wider than the width of the lead plate 3 and whose diameters on both sides are smoothly reduced. The former metal porous body 1 is rolled and formed so that the thickness of the original metal porous body 1 smoothly shifts from the both side edges of the lead plate 3 to the regular thickness portion.
[0019]
As described above, in the present embodiment, the strip-shaped three-dimensional metal porous body in the vicinity of the lead plate 3 generated by rolling the vicinity of the joined lead plate 3 and being pulled toward the lead plate 3 by joining the lead plate 3. 1 stress and distortion are corrected. Thus, the electrode substrate 7 formed by cutting thereafter is not warped, and without changing the entire thickness of the band-shaped three-dimensional porous metal body 1, the electrode substrate 7 of the electrode plate 7 is not changed. Variations in the amount of active material filling due to warping and troubles in the conveyance system can be prevented.
[0020]
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, after forming the electrode plate substrate 7 by cutting along the cutting line 6, the electrode plate substrate 7 is passed through the rolling roll 5 to roll the entire electrode plate substrate 7.
[0021]
According to the present embodiment, the local stress and distortion caused by the joining of the lead plate 3 can be surely corrected in the state of the electrode plate substrate 7 to eliminate the warp of the electrode plate substrate 7, and the above embodiment. The same operational effects can be obtained more reliably.
[0022]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, after forming the electrode plate substrate 7 by cutting along the cutting line 6, only the vicinity of the lead plate 3 is rolled by passing the electrode plate substrate 7 through the rolling roll 8.
[0023]
According to the present embodiment, the local stress and distortion caused by the joining of the lead plate 3 can be surely corrected in the state of the electrode plate substrate 7 to eliminate the warp of the electrode plate substrate 7, and the above embodiment. The same effect can be obtained.
[0024]
Specific examples of the effects of the above embodiments are shown in FIGS. 5 to 8 in comparison with the conventional example. As shown in FIG. 5, the warpage of the electrode 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 thickness is 5 mm, and rolling the entire band-shaped three-dimensional metal porous body 1 or the electrode plate substrate 7 is more effective than rolling only the vicinity of the lead plate 3, and the band-shaped three-dimensional is obtained. It can be seen that the rolling effect in the state of the electrode plate substrate 7 is more effective than the state of the metal porous body 1. However, if the whole is rolled, the whole thickness changes, and if it is rolled in the state of the electrode plate substrate 7, the equipment becomes large.
[0025]
The influence of the warpage of the electrode plate substrate 7 on the equipment operation rate is as shown in FIG. Since the warpage is large in the conventional example, the operating rate which is about 20% can be improved to 70 to 90% in the above embodiment.
[0026]
Moreover, the influence which the curvature of the board | substrate 7 for electrode plates has with respect to the filling amount variation of an active material becomes as shown in FIG. As shown in FIG. 8, the variation in the filling amount indicates the difference in 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%. What was 14% in the conventional example can be reduced to 5 to 9% in each embodiment, and the battery capacity variation can be reduced.
[0027]
【The invention's effect】
According to the method for manufacturing a battery electrode plate of the present invention, since the strip-shaped lead plate is joined as described above, the vicinity of the lead plate is rolled and then cut to form the electrode plate substrate. Can correct the stress and strain generated by being pulled toward the lead plate by the, so that the electrode substrate is not warped, the active material variation due to warping of the electrode substrate and the transport system The occurrence of troubles can be prevented.
[0028]
In addition, even if the strip-shaped three-dimensional metal porous body is rolled after joining the strip-shaped lead plate and then cut to form the electrode plate substrate, the lead is formed in the same manner as described above by rolling the entire strip-shaped three-dimensional metal porous body. The stress and distortion generated by the joining of the plates can be corrected, and the same effect can be obtained without warping the electrode plate substrate.
[0029]
Moreover, even if the vicinity of the lead plate of the substrate formed by cutting is rolled, the stress and distortion generated by the joining of the lead plate are corrected, and the substrate is not warped.
[0030]
Moreover, even if the substrate formed by cutting is rolled, the substrate is similarly warped, 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 in a first embodiment of the present invention.
FIGS. 2A and 2B show a schematic configuration of a manufacturing process of an electrode plate substrate according to a second embodiment of the present invention, wherein FIG. 2A is an overall perspective view, and FIG. 2B is a cross-sectional view taken along line AA in FIG. is there.
FIG. 3 is a perspective view showing a schematic configuration of a main part of a manufacturing process of an electrode plate substrate in a third embodiment of the present invention.
FIG. 4 is a perspective view showing a schematic configuration of a main part of a manufacturing process of an electrode plate substrate in a fourth embodiment of the present invention.
FIG. 5 is a view showing the warpage height of the electrode plate substrate in each embodiment and a 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 amount of active material filling in each embodiment and a conventional example.
FIG. 8 is an explanatory diagram of a method for calculating variation in the filling amount of an 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 Strip | belt-shaped three-dimensional metal porous body 3 Lead board 5 Rolling roll 6 Cutting line 7 Electrode board substrate 8 Rolling roll

Claims (4)

After joining one or more strip-shaped lead plates to the strip-shaped three-dimensional metal porous body, the electrode plate substrate is formed by cutting at an appropriate length, the electrode substrate is filled with an active material, and then appropriately cut. A battery plate manufacturing method for manufacturing a plate having a lead portion on one side, after joining the belt-shaped lead plate, rolling the vicinity of the lead plate, and then cutting to form a substrate for the electrode plate The manufacturing method of the electrode plate for batteries characterized by the above-mentioned. After joining one or more strip-shaped lead plates to the strip-shaped three-dimensional metal porous body, the electrode plate substrate is formed by cutting at an appropriate length, the electrode substrate is filled with an active material, and then appropriately cut. A method of manufacturing a battery electrode plate for manufacturing an electrode plate having a lead portion on one side, wherein the band-shaped lead plate is joined, the band-shaped three-dimensional metal porous body is rolled, and then cut to form a substrate for electrode plate Forming a battery electrode plate. After joining one or more strip-shaped lead plates to the strip-shaped three-dimensional metal porous body, the electrode plate substrate is formed by cutting at an appropriate length, the electrode substrate is filled with an active material, and then appropriately cut. A battery electrode manufacturing method for manufacturing an electrode plate having a lead portion on one side, wherein the vicinity of the lead plate of the electrode plate substrate formed by cutting is rolled. Production method. After joining one or more strip-shaped lead plates to the strip-shaped three-dimensional metal porous body, the electrode plate substrate is formed by cutting at an appropriate length, the electrode substrate is filled with an active material, and then appropriately cut. A battery plate manufacturing method for manufacturing a plate having a lead portion on one side, the method comprising rolling a plate substrate formed by cutting.

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