JPH09147879A - Method for manufacturing battery and battery pedestal - Google Patents

Abstract

(57) Abstract: The present invention provides a method for manufacturing a pedestal used for a battery,
The present invention relates to a battery using a pedestal and a pedestal, and an object thereof is to provide a battery having stable productivity, liquid leakage resistance, and performance. SOLUTION: As a method of manufacturing a pedestal 5, both ends of a strip-shaped or rod-shaped steel material having a predetermined shape end portion provided with a predetermined hole portion 9 are processed into a ring shape by roll molding so as to form a gap portion 8. To do. A battery that uses such a ring-shaped pedestal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention was obtained by a method of manufacturing a pedestal for use in a battery in which a power generation element is sealed by a sealing plate, a metal case, and an insulating packing interposed therebetween, and the method. It relates to a battery using a pedestal.

[0002]

2. Description of the Related Art Batteries, especially button type batteries, are filled with a power generating element in a certain size to maximize their reaction efficiency and are used for a long period of time. Improving the sex has been an important issue.

Conventionally, this type of battery has been disclosed in JP-A-60-24.
As described in Japanese Patent No. 1639, there is an attempt to use a pedestal having a space that can be filled between the inner side of the metal case and the positive electrode and that can be filled with the electrolytic solution, and the electrolytic solution filled in the void of the pedestal is supplied to the positive electrode. It has been studied that the battery reaction proceeds smoothly and the pedestal supports the sealing plate and the insulating packing to improve the leakage resistance.

[0004]

However, such a pedestal is press-formed by providing a flange portion having an inverted hat-shaped cross section as shown in FIG. 5, or an inverted U-shaped cross section as shown in FIG. It is molded into a shape. For this reason,
A considerable amount of bending white is required at the time of press forming, and therefore the amount of power generating elements that can actually be stored in the pedestal is relatively small. Further, in the case of a pedestal having a shape in which a flange portion is provided in an inverted hat shape, the flange portion supports the sealing plate and the insulating packing to seal the seal, and therefore the liquid leakage resistance cannot be said to be good.

The present invention solves such problems, and an object of the present invention is to provide a method for manufacturing a battery pedestal capable of increasing the capacity of the battery and improving the liquid leakage resistance, and a battery using this pedestal. And

[0006]

Means for Solving the Problems In order to achieve the above object, a method of manufacturing a battery pedestal of the present invention includes (1) a step of cutting a strip-shaped or rod-shaped steel material to a predetermined size, and a blank-shaped or rod-shaped steel material A step of forming a hole in a punch type,
Then, it is formed into a circle with a predetermined outer diameter by a roll type so as to form a gap at the joints at both ends.

(2) A step of cutting both ends of a strip-shaped or rod-shaped steel material to a predetermined angle dimension, a step of forming holes in the strip-shaped or rod-shaped steel material with a punch die, and then a roll die having a predetermined outer diameter dimension. Are processed into a circular shape so that the joints at both ends form a gap having an inverted cross section.

(3) A step of cutting a strip-shaped or rod-shaped steel material to a predetermined dimension, a step of cutting at least one corner of both ends of the strip-shaped or rod-shaped steel material to a dimension of a predetermined angle, a strip-shaped or rod-shaped steel material A step of forming a hole portion by a punch type is performed, and then a roll type is formed into a predetermined outer diameter dimension so that the joint portions at both end corners are circularly shaped to form a gap portion having a substantially inverted cross section. In addition, in the above manufacturing methods (1), (2), and (3), the hole portion formed in the strip-shaped or rod-shaped steel material is 40% of the entire area.
As a result, it is set to 80% or less. Further, the width of the gap formed when the strip-shaped and rod-shaped steel materials are joined in a circular shape at both ends by a roll type is 0.5 mm or more and 3 mm or less.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The pedestal manufactured by the above method is easy to process, and a gap is formed on the surface of the pedestal, more specifically, a portion where the insulating packing abuts, and the electrolytic solution is injected from this portion. It is possible to absorb the electrolyte in an instant and the production efficiency of the battery becomes extremely high, and after the battery is configured, the electrolyte captured in the holes in the pedestal causes electromotive reaction in the battery active material. As the battery gradually penetrates, the battery utilization rate becomes close to 100%, which is good.

The pores formed in the strip-shaped or bar-shaped steel material are set to 40% or more and 80% or less of the entire area because the strong discharge specification, that is, the discharge current of several hundreds, is set at 40% or less. This is because it is not possible to secure a trapping space that can supply a sufficient amount of electrolytic solution to the active material reaction surface for discharge at milliA. This is because when the ratio is 80% or more, the mechanical strength of the pedestal is insufficient, and the pedestal buckles, deforms or breaks when the battery is sealed. In addition, the width of the gap space formed by joining both ends of a strip-shaped or rod-shaped steel material in a circular shape by a roll type is 0.
If 5 mm or more and 3 mm or less is 0.5 mm or less, when the electrolytic solution is injected, the electrolytic solution permeates through this space into the space based on the fitting clearance formed by the metal case and the pedestal. This is because it takes time to complete the process and productivity becomes poor. When the thickness is 3 mm or more, the electrolyte solution is easily pumped up from the gap due to the crimping pressure in the caulking process of the battery sealing character, and the electrolyte solution leaks immediately after sealing the electrolytic solution, so that the required amount of the electrolytic solution cannot be filled. In addition, since the manufacturing apparatus is contaminated or corroded by the liquid leakage immediately after, it is necessary to constantly wash the apparatus, and therefore productivity is deteriorated.

[0011]

An embodiment of the present invention will be described below.

FIG. 1 shows a button type lithium-copper oxide organic electrolyte battery, in which 1 is a SUS having a thickness of 0.2 mm.
A battery can made by punching a steel plate material to an outer diameter of 9.5 mm and a height of 2.0 mm, and 2 is a sealing punched to have an outer diameter of 8.2 mm and a height of 0.9 mm, the surface of which is corrosion-resistant plated. The plate 3 is a negative electrode active material made of a lithium sheet having a diameter of 6.8 mm and a thickness of 0.9 mm, and is pressed onto the inner bottom surface of the sealing plate 2. 4 is a positive electrode mixture in the form of a pellet, which is pressure-bonded or placed in the pedestal 5 of the present invention, and 90 parts by weight of copper oxide as an active material, 5 parts by weight of acetylene black, and a fluororesin binder made of fukka vinylidene. A mixture of 5 parts by weight is pressed into the pedestal 5. 5 shows one embodiment of the pedestal of the present invention, which has an outer diameter of 9.0 m.
As shown in FIG. 2, on the surface 5A which has a ring shape of m, an inner diameter of 5 mm, and a height of 0.65 mm, and contacts the bottom surface of the insulating packing 7, the gap portion 8 having the predetermined width (in this case, 1.0
mm space). Also, the side surface portion 5B of the pedestal
The holes 9 for holding the electrolytic solution are uniformly provided at the predetermined opening ratio (in this case, the opening ratio is 50%). 6 is a polypropylene microporous membrane having a diameter of 9.1 mm and a thickness of 0.15 mm. As the electrolytic solution, a solution prepared by dissolving lithium trifluoromethanesulfonate in a mixed solvent of equal volume of propylene carbonate and 1.2-dimethoxyethane at a ratio of 1 mol / l was used.

Next, a method of manufacturing the pedestal 5 of the present invention will be described. A step of cutting a strip-shaped or rod-shaped steel material into a predetermined size by a press, a punch to the strip-shaped or rod-shaped steel material, and a space of the above-mentioned ratio on the surface of the steel material. It is manufactured by a step of forming the hole portion 9 and a step of forming it into a circular shape in a roll shape with a predetermined outer diameter dimension so as to form the gap portion 8 having the predetermined width at the joint portions at both ends.

Next, the hole portion 9 provided on the side surface portion 5B of the pedestal.
As a basis for setting the open area ratio of 40% or more and 80% or less with respect to the entire area, the liquid leakage generation rate immediately after the lithium copper oxide battery having the above structure was formed with each open area (Table 1). Shown in.

[0015]

[Table 1]

Table 2 shows the discharge utilization rate when this battery was discharged at 600Ω.

[0017]

[Table 2]

As described above, the upper limit of the opening ratio is 80%. When the opening ratio is 80% or more, the mechanical strength of the pedestal is insufficient, so the pedestal buckles or deforms when the battery is sealed.
This is because destruction will occur.

The experiment of Table 1 is a comparison in the case of constructing 1000 cells at a speed of 60 cells / minute, and the experiment was conducted with the pedestal having a gap width of 1.0 mm.

The experiment of Table 2 is the average value of the utilization rate when 10 batteries were discharged. In addition to the present embodiment, as the form of the gap portion of the pedestal, the same effect can be obtained with the products shown in FIGS. As a method of manufacturing the pedestal shown in FIG. 3, a step of cutting both ends of a strip-shaped or rod-shaped steel material to a predetermined angle dimension, a step of forming holes in the strip-shaped or rod-shaped steel material with a punch die, and then a predetermined outer surface It can be processed by a process of forming a circular shape with a roll shape in the radial dimension so that the joint portions at both ends form a gap portion having an inverted cross section. As a method of manufacturing the pedestal shown in FIG.
Process of cutting strip-shaped or rod-shaped steel material to a predetermined dimension, process of cutting at least one corner of both ends of the strip-shaped or rod-shaped steel material to a predetermined angle dimension, punch-type punching of holes in the strip-shaped or rod-shaped steel material Then, it is obtained by processing in a circular shape with a predetermined outer diameter to form a circular joint at both end corners so as to form a gap having a substantially inverted cross section.

[0021]

As is apparent from (Table 1) and (Table 2) above, by using the pedestal according to this embodiment, it is possible to provide a battery which has no immediate leakage and has excellent discharge performance. In addition, by forming the pedestal for the battery by the manufacturing method of the present invention, the processing cost can be reduced by about 3 steps as compared with the conventional method, and the cost can be reduced.

In this example, the example of the lithium-copper oxide organic electrolyte battery has been described. However, the positive electrode uses a metal oxide such as fluorocarbon, molybdenum oxide, manganese dioxide or silver chromate, or a fluoride, Alternatively, a silver oxide battery or a manganese battery using an alkaline aqueous solution, a neutral salt or the like as an electrolytic solution can be applied to a battery requiring a pedestal like the present invention.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a battery showing an embodiment of the present invention.

FIG. 2 is a perspective view of a pedestal showing an embodiment of the present invention.

FIG. 3 is a schematic front view showing the shape of a pedestal gap portion according to another embodiment of the present invention.

FIG. 4 is a schematic front view showing the shape of a pedestal gap portion according to another embodiment of the present invention.

FIG. 5 is a three-dimensional schematic view of a pedestal showing a conventional embodiment.

FIG. 6 is a three-dimensional schematic view of a pedestal showing another conventional embodiment.

[Explanation of symbols]

 1 Battery Can 2 Sealing Plate 3 Negative Electrode Active Material 4 Positive Electrode Active Material 5 Pedestal 5A Pedestal 5A Pedestal Insulation Contact with Bottom Surface 5B Pedestal Side 6 Porous Membrane 7 Insulating Packing 8 Gap 9 Void

Claims (5)

[Claims] 1. A method of manufacturing a pedestal which supports a sealing plate and an insulating packing and has holes capable of being filled with an electrolytic solution, the method comprising cutting a strip-shaped or rod-shaped steel material into a predetermined size,
Method for manufacturing a battery pedestal, which comprises a step of forming a hole in a strip-shaped or bar-shaped steel material, and then a step of forming a circular shape in a roll shape to a predetermined outer diameter so as to form a gap at the joint at both ends . 2. A method of manufacturing a pedestal having a hole capable of filling an electrolytic solution while supporting a sealing plate and an insulating packing, which is a step of cutting a strip-shaped or rod-shaped steel material into a predetermined angle dimension, a strip shape, A step of forming holes in a rod-shaped steel material,
Next, a method of manufacturing a battery pedestal, which comprises a step of forming a circular shape having a predetermined outer diameter dimension so that the joint portions at both ends form a gap portion having a V-shaped cross section. 3. A method of manufacturing a pedestal which supports a sealing plate and an insulating packing and has holes capable of being filled with an electrolytic solution, the method comprising cutting a strip-shaped or rod-shaped steel material into a predetermined size,
A step of cutting at least one corner of both ends of a strip or rod-shaped steel material to a predetermined angle dimension, a step of forming holes in the strip or rod-shaped steel material, and then a roll-type circular shape with a predetermined outer diameter dimension. A method of manufacturing a battery pedestal, which comprises the step of processing so that the joints at both end corners form a gap having a substantially inverted cross section. 4. The method of manufacturing a battery pedestal according to claim 1, wherein the gap width between the both ends of the steel material supporting the sealing plate and the insulating packing is 0.5 mm or more and 3 mm or less. 5. A battery using a battery pedestal made by the method according to claim 1.