JP6642287B2 - Cylindrical stacked battery - Google Patents

Description

  The present invention relates to a cylindrical stacked battery.

  Regarding a conventional cylindrical laminated battery, for example, Japanese Patent No. 5369342 discloses a laminated battery aimed at suppressing a rise in temperature inside the battery and preventing a short circuit between electrodes. (Patent Document 1).

  The laminated battery disclosed in Patent Literature 1 has an outer package having a bottomed cylindrical can, and an electrode composed of a positive electrode, a negative electrode, and a separator, which are stacked in the axial direction of the cylindrical can and housed inside the outer package. And a current collector extending in the axial direction of the cylindrical can and penetrating the center of the electrode body. The outer edge of the positive electrode is in contact with the cylindrical can, and the positive electrode and the cylindrical can are electrically connected. The negative electrode is in contact with the current collector, and the negative electrode and the current collector are electrically connected.

Japanese Patent No. 5369342

  As disclosed in Patent Document 1 described above, a cylindrical stacked battery in which a positive electrode and a negative electrode (electrode) are stacked and accommodated in a cylindrical housing in the axial direction of the cylindrical housing is known. In the manufacturing process of such a cylindrical laminated battery, good workability when inserting the electrode into the cylindrical housing is required. Further, it is necessary to prevent an excessive load from being applied to the electrodes when inserting the electrodes into the cylindrical housing.

  Therefore, an object of the present invention is to solve the above-described problems, and to provide a cylindrical stacked battery which has good workability when inserting an electrode into a cylindrical housing and reduces a load applied to the electrode. That is.

  A cylindrical stacked battery according to the present invention includes a cylindrical housing, a positive electrode housed in the cylindrical housing, and a negative electrode housed in the cylindrical housing. The positive electrode and the negative electrode are alternately stacked in the axial direction of the cylindrical housing. The cylindrical stacked battery includes a current collector extending in the axial direction of the cylindrical housing and penetrating the positive electrode and the negative electrode. A first electrode, which is one of the positive electrode and the negative electrode, is electrically connected to the cylindrical housing. A second electrode, which is the other of the positive electrode and the negative electrode, is electrically connected to the current collector. A male screw is provided on the outer peripheral edge of the first electrode. A female screw into which a male screw is screwed is provided on the inner peripheral surface of the cylindrical housing.

  According to the cylindrical stacked battery configured as described above, by connecting the cylindrical housing and the first electrode by the screw structure, the workability when inserting the electrode into the cylindrical housing is improved, and the electrode is connected to the electrode. The applied load can be reduced.

  As described above, according to the present invention, it is possible to provide a cylindrical stacked battery that has good workability when inserting an electrode into a cylindrical housing and reduces the load applied to the electrode.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the cylindrical laminated battery in embodiment of this invention. FIG. 2 is a schematic plan view illustrating a positive electrode in FIG. 1. FIG. 2 is a schematic plan view illustrating a negative electrode in FIG. 1. FIG. 4 is a perspective view illustrating a negative electrode in a range surrounded by a two-dot chain line IV in FIG. 3. It is a perspective view which shows the cylindrical housing in FIG. FIG. 2 is a cross-sectional view illustrating an assembly process of the cylindrical stacked battery in FIG. 1.

  An embodiment of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members have the same reference characters allotted.

  FIG. 1 is a sectional view showing a cylindrical laminated battery according to an embodiment of the present invention. Referring to FIG. 1, cylindrical stacked battery 100 in the present embodiment is a nickel-metal hydride battery. The cylindrical stacked battery 100 is, for example, for a vehicle.

  The cylindrical stacked battery 100 includes a cylindrical housing 10, a lid 20, a positive electrode 30, and a negative electrode 40.

  The cylindrical housing 10 has a bottomed cylindrical shape. The cylindrical housing 10 may be, for example, a nickel-plated iron can or the like. The cylindrical housing 10 has an open end that opens at an end in the axial direction (axial direction of the central axis 101). The lid 20 is provided at an open end of the cylindrical housing 10.

  The positive electrode 30 and the negative electrode 40 are housed in the cylindrical housing 10. The positive electrode 30 and the negative electrode 40 are stacked in the axial direction of the cylindrical housing 10. The number of layers should not be particularly limited. The number of laminations indicates the total number of the positive electrode 30 and the negative electrode 40 that are adjacent to each other as one set. The number of layers may be, for example, about 2 to 30.

  The positive electrode 30 and the negative electrode 40 are alternately stacked in the axial direction of the cylindrical housing 10. A separator 50 is disposed between the positive electrode 30 and the negative electrode 40. The separator 50 may have a bag shape. That is, the positive electrode 30 and the negative electrode 40 may be inserted into the bag-shaped separator 50. The separator 50 may be, for example, a nonwoven fabric made of polyolefin. The surface of the separator 50 may be subjected to a hydrophilic treatment or the like.

  Although not shown, the cylindrical housing 10 contains an electrolytic solution. The electrolyte is, for example, a potassium hydroxide (KOH) aqueous solution. The concentration of the aqueous solution may be, for example, 1 to 10 mol / l.

  In addition, in the figure, in order to clearly show each configuration, the positive electrode 30 and the negative electrode 40 are shown apart from each other in the axial direction of the cylindrical casing 10. In contact.

  FIG. 2 is a schematic plan view showing the positive electrode in FIG. FIG. 3 is a schematic plan view showing the negative electrode in FIG.

  Referring to FIGS. 1 to 3, positive electrode 30 has a disk shape. At the center of the positive electrode 30, a through hole 31 is provided that penetrates the positive electrode 30 in the thickness direction (the axial direction of the cylindrical housing 10). The positive electrode 30 contains at least one of nickel hydroxide and nickel oxyhydroxide as a positive electrode active material. The positive electrode 30 may be a conventionally known sintered nickel positive electrode. The positive electrode 30 may be a conventionally known non-sintered nickel positive electrode. The base material supporting the positive electrode active material may be, for example, foamed nickel or the like.

  The negative electrode 40 has a disk shape. The diameter of the negative electrode 40 is larger than the diameter of the positive electrode 30. In the center of the negative electrode 40, a through hole 41 is provided to penetrate the negative electrode 40 in the thickness direction (the axial direction of the cylindrical housing 10). The diameter of the through hole 41 of the negative electrode 40 is larger than the diameter of the through hole 31 of the positive electrode 30. The negative electrode 40 contains a hydrogen storage alloy as a negative electrode active material. The negative electrode 40 may be, for example, a molded body of a hydrogen storage alloy. The negative electrode 40 may be, for example, a material in which a particulate hydrogen storage alloy, a conductive material, and a binder are supported on a base material such as a punching metal.

  The cylindrical stacked battery 100 further includes a current collector 60 and an insulating plate 61. The current collector 60 is a rod-shaped member. The current collector 60 extends in the axial direction of the cylindrical housing 10. The current collector 60 extends along the central axis 101 of the cylindrical housing 10. The current collector 60 has a circular cross section when cut by a plane orthogonal to the axial direction of the cylindrical housing 10. The current collector 60 may be, for example, a nickel-plated copper rod or a nickel rod. The current collector 60 is inserted into the through hole 31 of the positive electrode 30 and the through hole 41 of the negative electrode 40. The current collector 60 penetrates the positive electrode 30 and the negative electrode 40 in the axial direction of the cylindrical housing 10.

  The negative electrode 40 is electrically connected to the cylindrical housing 10. Positive electrode 30 is electrically connected to current collector 60. That is, the cylindrical housing 10 functions as a negative electrode current collector, and the current collector 60 functions as a positive electrode current collector.

  The negative electrode 40 has an outer peripheral edge 40 a and an inner peripheral edge 40 b that defines the through hole 41. The negative electrode 40 is provided so as to be in contact with the cylindrical housing 10. The outer peripheral edge 40a of the negative electrode 40 and the inner peripheral surface 10b of the cylindrical housing 10 are in contact with each other. The negative electrode 40 is provided so as not to be in contact with the current collector 60. A gap is provided between the inner peripheral edge 40 b of the negative electrode 40 and the current collector 60.

  The positive electrode 30 has an outer peripheral edge 30 a and an inner peripheral edge 30 b that defines the through hole 31. The positive electrode 30 is provided so as to be in contact with the current collector 60. The inner peripheral edge 30b of the positive electrode 30 and the outer peripheral surface 60a of the current collector 60 are in contact with each other. The positive electrode 30 is provided so as not to contact the cylindrical housing 10. A gap is provided between the outer peripheral edge 30a of the positive electrode 30 and the inner peripheral surface 10b of the cylindrical housing 10.

  The current collector 60 is abutted on the insulating plate 61 in the axial direction of the cylindrical housing 10. The insulating plate 61 is interposed between the stacked body of the positive electrode 30 and the negative electrode 40 and (the bottom of) the cylindrical housing 10 in the axial direction of the cylindrical housing 10. The current collector 60 is electrically insulated from the cylindrical housing 10 by the insulating plate 61. The insulating plate 61 may be, for example, a resin plate.

  The lid 20 is electrically connected to the current collector 60. Lid 20 may be welded to current collector 60. Lid 20 may be joined to current collector 60 by screwing. The lid 20 and the current collector 60 may be an integral body.

  FIG. 4 is a perspective view showing the negative electrode in a range surrounded by a two-dot chain line IV in FIG. FIG. 5 is a perspective view showing the cylindrical housing in FIG.

  Referring to FIGS. 1, 4 and 5, external thread 42 is provided on outer peripheral edge 40 a of negative electrode 40. A female screw 12 into which a male screw 42 is screwed is provided on the inner peripheral surface 10 b of the cylindrical housing 10.

  The male screw 42 extends helically along the axial direction of the cylindrical housing 10. The female screw 12 extends helically along the axial direction of the cylindrical housing 10. The female screw 12 is provided continuously in the axial direction of the cylindrical housing 10. The plurality of negative electrodes 40 include, among the plurality of negative electrodes 40, a negative electrode 40 p located farthest from the opening end of the cylindrical housing 10 in the axial direction of the cylindrical housing 10. The female screw 12 is provided at least in a range between the open end of the cylindrical housing 10 and the negative electrode 40 p in the axial direction of the cylindrical housing 10.

  In the present embodiment, the case has been described where the negative electrode 40 and the positive electrode 30 are electrically connected to the cylindrical housing 10 and the current collector 60, respectively. It may be configured to be electrically connected to the body 60 and the cylindrical housing 10. In this case, a male screw is provided on the outer peripheral edge 30a of the positive electrode 30.

  FIG. 6 is a sectional view showing an assembling process of the cylindrical laminated battery in FIG. Referring to FIG. 6, positive electrode 30 and negative electrode 40 are alternately fitted on the outer periphery of current collector 60. A subassembly 70 including the current collector 60, the positive electrode 30, the negative electrode 40, the lid 20, and the insulating plate 61 is obtained.

  Next, the subassembly 70 is inserted into the cylindrical housing 10. At this time, the female screw 12 of the cylindrical housing 10 and the male screw 42 of the negative electrode 40 are screwed together by rotating the cylindrical housing 10 in the circumferential direction. When the female screw 12 of the cylindrical housing 10 and the male screw 42 of each negative electrode 40 are screwed one after another, the subassembly 70 enters into the cylindrical housing 10. By connecting between the cylindrical casing 10 and the lid 20, the cylindrical laminated battery 100 in FIG. 1 is completed.

  According to such a configuration, workability at the time of inserting the subassembly 70 into the cylindrical housing 10 can be improved. Further, since there is no need to press-fit the sub-assembly 70 into the cylindrical housing 10, the load applied to the electrodes when the sub-assembly 70 is inserted can be reduced. Thereby, the reliability of the cylindrical stacked battery 100 can be improved. In addition, by using a screw structure for connection between the cylindrical housing 10 and the electrode, the contact between the cylindrical housing 10 and the electrode is made more reliable, and the fastening force due to the screw structure is more reliably applied to the electrode. Can be.

  The structure of the cylindrical laminated battery 100 according to the embodiment of the present invention described above will be described collectively. The cylindrical laminated battery 100 according to the present embodiment includes a cylindrical housing 10 and a cylindrical housing 10. And a negative electrode 40 housed in the cylindrical housing 10. The positive electrode 30 and the negative electrode 40 are alternately stacked in the axial direction of the cylindrical housing 10. The cylindrical stacked battery 100 includes a current collector 60 extending in the axial direction of the cylindrical housing 10 and penetrating the positive electrode 30 and the negative electrode 40. The negative electrode 40 as a first electrode, which is one of the positive electrode 30 and the negative electrode 40, is electrically connected to the cylindrical housing 10. The positive electrode 30 as a second electrode, which is the other electrode of the positive electrode 30 and the negative electrode 40, is electrically connected to the current collector 60. A male screw 42 is provided on an outer peripheral edge 40 a of the negative electrode 40. A female screw 12 into which a male screw 42 is screwed is provided on the inner peripheral surface 10b of the cylindrical housing 10.

  According to the cylindrical stacked battery 100 according to the embodiment of the present invention configured as described above, it is possible to reduce the load applied to the electrodes while improving the workability when inserting the electrodes into the cylindrical housing 10. Can be.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  INDUSTRIAL APPLICABILITY The present invention is applied to a cylindrical stacked battery in which a positive electrode and a negative electrode are stacked and accommodated in a cylindrical housing in the axial direction of the cylindrical housing.

  DESCRIPTION OF SYMBOLS 10 Cylindrical housing, 10b inner peripheral surface, 12 female threads, 20 lid, 30 positive electrode, 30a, 40a outer peripheral edge, 30b, 40b inner peripheral edge, 31, 41 through hole, 40, 40p negative electrode, 42 male screw, 50 separator, 60 Current collector, 60a outer peripheral surface, 61 insulating plate, 70 subassembly, 100 cylindrical laminated battery.

Claims (1)

A cylindrical housing;
A positive electrode housed in the cylindrical housing;
A negative electrode housed in the cylindrical housing,
The positive electrode and the negative electrode are alternately stacked in the axial direction of the cylindrical housing, and further,
A current collector extending in the axial direction of the cylindrical housing and penetrating the positive electrode and the negative electrode,
A first electrode, which is one of the positive electrode and the negative electrode, is electrically connected to the cylindrical housing,
A second electrode, which is the other of the positive electrode and the negative electrode, is electrically connected to the current collector,
An external thread is provided on an outer peripheral edge of the first electrode,
A cylindrical laminated battery in which a female screw into which the male screw is screwed is provided on an inner peripheral surface of the cylindrical housing.

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