WO2013038946A1 - 円筒形電池 - Google Patents
円筒形電池 Download PDFInfo
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- WO2013038946A1 WO2013038946A1 PCT/JP2012/072423 JP2012072423W WO2013038946A1 WO 2013038946 A1 WO2013038946 A1 WO 2013038946A1 JP 2012072423 W JP2012072423 W JP 2012072423W WO 2013038946 A1 WO2013038946 A1 WO 2013038946A1
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- electrode
- electrode plate
- positive electrode
- negative electrode
- battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/24—Electrodes for alkaline accumulators
- H01M4/26—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/24—Electrodes for alkaline accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a cylindrical battery such as an alkaline storage battery or a lithium ion secondary battery.
- an electrode formed by spirally winding a belt-like positive electrode plate and a negative electrode plate via a separator Some plate groups are housed and sealed in a cylindrical battery case (also referred to as a battery case or battery case).
- a cylindrical battery case also referred to as a battery case or battery case.
- an electrode plate group in a cylindrical shape is formed by spirally winding a belt-like positive electrode plate and a negative electrode plate through a separator so as to be substantially solid. It is housed and configured.
- the present applicant is developing a low-capacity cylindrical battery corresponding to the application in the cylindrical battery whose capacity has been increasing in recent years. Specifically, for example, it is considered that the number of times of winding the belt-like positive electrode plate and the negative electrode plate in a spiral shape is reduced and accommodated in a battery case as a cylindrical shape.
- the electrode plate is particularly used in order not to reduce the charge / discharge efficiency. It is necessary to press the positive electrode or negative electrode located on the innermost periphery of the group against the electrode plate group.
- the inventors of the present application have found that there are the following problems when the cylindrical electrode plate group is accommodated in the battery case as described above. That is, since the positive electrode or the negative electrode is configured by winding a belt-shaped electrode plate, when pressed from the inner side toward the inner peripheral surface of the separator, the positive electrode or the negative electrode is less likely to expand outside by the pressing force, There is a problem that it is difficult to press the pole group. As a result, there is a problem that the positive and negative electrodes are not sufficiently pressed and the charge / discharge efficiency is lowered.
- the present invention has been made to solve the above problems all at once.
- a cylindrical battery it is easy to press the positive electrode and the negative electrode, and discharge efficiency (in the case of a primary battery) or charge / discharge efficiency (secondary battery).
- the main intended task is to improve the battery).
- the cylindrical battery according to the present invention includes a cylindrical battery case and a cylindrical electrode group having a positive electrode, a negative electrode, and a separator, and a space is formed inside the electrode group, and the positive electrode or the The negative electrode is divided into a plurality of electrode pieces in the circumferential direction.
- the pole group can be easily pressed from the radially inner side toward the radially outer side.
- the positive electrode or the negative electrode is divided into a plurality of electrode pieces in the circumferential direction, each electrode piece moves individually when these electrode pieces are pressed from the radially inner side toward the radially outer side.
- the pole group can be easily pressed.
- the discharge efficiency (in the case of a primary battery) or charging / discharging efficiency (in the case of a secondary battery) of a cylindrical battery can be improved.
- the positive electrode and the negative electrode are wound once, the amount of the positive electrode and negative electrode substrates and separator used can be greatly reduced, and the number of manufacturing steps such as entrainment thereof can be reduced.
- the holding member which is arrange
- the holding member presses the electrode group from the inside, it is possible to prevent a decrease in the current collection efficiency by preventing the active material from falling off due to the positive electrode or the negative electrode loosening to the inside.
- the holding member holds the state in which the outer peripheral surface of the pole group and the inner peripheral surface of the battery case are pressed against each other, so that discharge efficiency (in the case of a primary battery) or charge / discharge efficiency (in the case of a secondary battery) Can be prevented. Further, by reducing the number of turns of the pole group wound in a cylindrical shape, the usage amount of the positive and negative electrode current collectors and separators can be greatly reduced, and the man-hours for manufacturing such as entrainment can be reduced.
- the positive electrode or the negative electrode is divided into a plurality of electrode pieces having a circumferential length of half or less.
- the electrode plate can be press-molded by setting the length of the electrode piece in the circumferential direction to a half or less.
- the electrode piece has a length in the circumferential direction longer than a half circumference, it is difficult to press-mold with a mold, so it is necessary to form the electrode piece by winding, and defects are increased due to winding deviation or the like.
- the positive electrode or the negative electrode preferably has a longer side in the winding axis direction of the pole group than a side in the circumferential direction. If this is the case, since the electrode shape approaches a square from a long strip shape that is a scroll, the handling and winding process during manufacture can be facilitated. In addition, the pressing of the pole group is facilitated, and the discharge efficiency (in the case of the primary battery) or the charge / discharge efficiency (in the case of the secondary battery) of the cylindrical battery can be improved.
- the positive electrode or the negative electrode is based on a metal plate having a large number of through holes. Since the current collecting terminal is welded to a conductor connected to the outside, strength is required. In an electrode using a porous body, a compression process is used to obtain a strength necessary for welding. On the other hand, if a metal plate is used as a base material, it can be welded as it is without undergoing a compression step.
- the positive electrode or the negative electrode is divided into two electrode pieces.
- the positive electrode or the negative electrode have a plurality of electrode piece parts divided in the circumferential direction and a connecting part that connects parts of the electrode piece parts adjacent to each other. If it is this, when an electrode piece part is pressed toward the inner peripheral surface of a separator from an inner side, since each electrode piece part moves separately, it can make it easy to press a pole group. In addition, since the electrode pieces are connected and integrated with each other by the connecting portion, the handling and the entrainment process at the time of manufacture can be facilitated. Thereby, when the positive electrode and the negative electrode are wound once, the amount of the positive electrode and negative electrode substrates and separator used can be greatly reduced, and the number of manufacturing steps such as entrainment thereof can be reduced. .
- the connecting portion also serves as a current collecting terminal. Moreover, since current collection is performed at the connecting portion, the current collection distance to the active material is shortened, and the resistance is preferably reduced.
- the positive electrode or the negative electrode from a single base material.
- the welding process corresponding to that can be omitted.
- the connecting portion also serves as a current collecting terminal, there can be an advantage that there is no welded portion before reaching the current collecting terminal, and the resistance does not increase.
- the positive electrode or the negative electrode is based on a metal plate having a large number of through holes, and the electrode piece and the connecting portion are integrally formed. If this is the case, a circular electrode can be easily produced simply by folding the electrode at the connecting portion.
- the connecting portion not only becomes a current collecting terminal, but the current collecting terminal can be the upper end or the lower end in the cylindrical axis direction, and the subsequent battery case or sealing body Welding can be simplified.
- the connecting portion is preferably perpendicular to the winding axis of the electrode group. If the connecting portion is arranged in parallel with the winding axis of the electrode group, that portion is a region where the electrode reaction is possible, and thus the volume contributing to the electrode reaction is reduced. Since the electrode reaction does not occur so much on the plane perpendicular to the winding axis, the volume that narrows the portion that contributes to the electrode reaction can be reduced by arranging the connecting portion.
- the positive electrode or the negative electrode In a state where the positive electrode or the negative electrode is unfolded, it has a plurality of electrode pieces and a connecting portion that forms a rectangular shape extending outward in the upward direction while connecting the upper ends of adjacent sides adjacent to each other in these electrode pieces.
- the vertical dimension of the electrode piece part and the vertical dimension of the connecting part are equal.
- the positive electrode and the negative electrode can be easily pressed to improve the discharge efficiency (in the case of the primary battery) or the charge / discharge efficiency (in the case of the secondary battery). it can.
- the expanded view of the positive electrode plate of 2nd Embodiment The figure which shows the manufacturing method of the positive electrode plate of 2nd Embodiment.
- the secondary battery 100 is an alkaline storage battery such as a nickel / cadmium storage battery or a nickel / hydrogen storage battery. Specifically, this is a low-capacity type cylindrical battery having, for example, an AA type capacity of 1800 mAh or less, or an AA type capacity of 650 mAh or less. As shown in FIGS. A metal battery case 2 having a cylindrical shape, and a cylindrical electrode plate group 3 disposed in the battery case 2 and including a positive electrode plate 31, a negative electrode plate 32, and a separator 33 are provided.
- the battery case 2 has a bottomed cylindrical shape with nickel plating, and the upper opening is sealed with a sealing body 5 via an insulator 4 as shown in FIG. Further, a current collecting terminal 311 provided so as to protrude from the upper end portion of the positive electrode plate 31 is connected to the back surface of the sealing body 5 by, for example, welding, and the sealing body 5 becomes a positive electrode terminal.
- the outer peripheral surface 3n of the negative electrode plate 32 located on the outermost periphery of the electrode plate group 3 contacts the inner peripheral surface 2m of the battery case 2, and the battery case 2 itself becomes a negative electrode terminal (FIG. (See the partial enlarged view of 2).
- the electrode plate group 3 has a cylindrical shape configured by concentrically arranging a two-turn positive electrode plate 31 and a two-turn negative electrode plate 32 with a separator 33 made of, for example, a polyolefin nonwoven fabric. .
- the separator is impregnated with an electrolytic solution such as potassium hydroxide.
- a polyethylene bag-shaped one may be used.
- the positive electrode plate 31 is made of, for example, a positive electrode current collector made of a perforated steel plate, which is a two-dimensional base material plated with nickel, and a positive electrode active material coated on the positive electrode current collector.
- the positive electrode active material is, for example, nickel hydroxide in the case of a nickel / cadmium storage battery, and nickel hydroxide to which calcium hydroxide is added in the case of a nickel / hydrogen storage battery.
- the negative electrode plate 32 is made of a negative electrode current collector made of a perforated steel sheet plated with nickel in the same manner as the positive electrode plate 31, and a negative electrode active material coated on the negative electrode current collector.
- the negative electrode active material in the case of nickel-cadmium battery is a mixture of e.g. cadmium oxide powder and metallic cadmium powder, in the case of nickel-hydrogen storage battery, for example, primarily AB 5 type (rare earth) or is a powder of hydrogen absorbing alloy of AB 2 type (Laves phase).
- the positive electrode plate 31 and the negative electrode plate 32 are configured using a two-dimensional base material such as a perforated steel plate instead of a foam base material such as a nickel hole, the active material is likely to fall off.
- the positive electrode plate 31 has two electrode pieces 31A and 31B divided into two equal parts in the circumferential direction
- the negative electrode plate 32 has two electrode pieces 32A divided into two equal parts in the circumferential direction. 32B.
- each of the electrode pieces 31A, 31B, 32A, and 32B has a substantially rectangular shape in plan view, and the positions of the electrode pieces 31A, 31B, 32A, and 32B are arranged. In the circumference, it has a circumferential length of approximately half a circumference. That is, in this embodiment, each electrode piece 31A, 31B, 32A, 32B arranged in the battery case 2 has an approximately 1/2 arc shape when viewed from the axial direction. A slit along the axial direction is formed between two electrode pieces (for example, 31A and 31B) adjacent in the circumferential direction.
- current collector terminals 311 and 321 are provided at the upper ends of the electrode pieces 31A, 31B, 32A and 32B, respectively, and after being accommodated in the battery case 2, the positive electrode plate 31 is provided.
- the current collecting terminal 311 is connected to the sealing body 5, and the current collecting terminal 321 of the negative electrode plate 32 is connected to the battery case 2.
- each electrode piece 31A, 31B, 32A, 32B and the current collection terminal 311,321 provided in the said electrode piece 31A, 31B, 32A, 32B are integrally formed by the perforated steel plate.
- the alkaline storage battery 100 of this embodiment is arrange
- the holding member 6 is in contact with the inner peripheral surface 3 m of the electrode plate group 3, in this embodiment, the entire inner peripheral surface of the positive electrode plate 31 positioned at the innermost periphery.
- the holding member 6 made of a flat plate is curved and deformed into a cylindrical shape and is disposed in the hollow portion 3X of the electrode plate group 3, so that the outer peripheral surface 6n of the holding member 6 is made into an electrode plate by its elastic restoring force.
- the holding member 6 is preferably in contact with the entire inner peripheral surface 3m of the electrode plate group 3 so that its length dimension is not less than the inner peripheral length of the hollow portion 3X of the electrode plate group 3,
- the width dimension is desirably substantially equal to the axial length of the hollow portion 3X of the electrode plate group 3.
- the holding member 6 Since the holding member 6 is in pressure contact with the inner peripheral surface 3 m of the electrode plate group 3 by the holding member 6, not only does the positive electrode active material of the positive electrode plate 31 located on the innermost circumference fall off, The negative electrode active material from the negative electrode plate 32 can be prevented from falling off. Thereby, the fall of current collection efficiency can be prevented. Moreover, since the holding member 6 holds the state where the outer peripheral surface 3n of the electrode plate group 3 and the inner peripheral surface 2m of the battery case 2 are in contact, the outer peripheral surface 3n of the electrode plate group 3 and the battery case 2 The contact with the inner peripheral surface 2m can be ensured to prevent the charge / discharge efficiency from being lowered. In addition, since the holding member 6 is configured by deforming one plate into a cylindrical shape, the space in the battery 100 can be increased, and an increase in battery internal pressure can be prevented.
- the manufacturing method of the alkaline storage battery 100 of this embodiment will be briefly described.
- the two electrode pieces 32 ⁇ / b> A and 32 ⁇ / b> B of the negative electrode plate 32 are each deformed into a semicylindrical shape using a press die (see FIG. 4) and accommodated in the battery case 2.
- the separator 33 wound in a cylindrical shape is accommodated inside the electrode pieces 32A and 32B in the radial direction.
- the two electrode pieces 31A and 31B of the positive electrode plate 31 are each deformed into a semi-cylindrical shape by using a press die (see FIG. 4), and each is deformed into a semi-cylindrical shape to separate the separator in the battery case 2.
- 33 is accommodated radially inward.
- the double-turn positive electrode plate 31 and the double-turn negative electrode plate 32 are accommodated in the battery case 2 concentrically via the separator 33. Then, an electrolytic solution is injected. Thereafter, the holding member 6 deformed into a cylindrical shape smaller than the inner diameter of the hollow portion 3X is disposed in the hollow portion 3X of the electrode plate group 3. As a result, the electrode plate group 3 can be fixed to the battery case 2.
- the current collecting terminals 321 of the electrode pieces 32A and 32B of the negative electrode plate 32 are connected to the bottom surface of the battery case 2, and the current collecting terminals 311 of the electrode pieces 31A and 31B of the positive electrode plate 31 are connected to the back surface of the sealing body 5 and
- the sealing body 5 is fixed to the upper opening of the battery case 2 via the insulator 4 by caulking or the like.
- the electrolytic solution may be injected after the electrode plate group 3 is accommodated in the battery case 2 and the holding member 6 is disposed.
- the positive electrode plate 31 and the negative electrode plate 32 are divided into two electrode pieces 31A, 31B, 32A, and 32B in the circumferential direction.
- the electrode pieces 31A, 31B, 32A, and 32B are pressed from the inside toward the inner peripheral surface of the separator 33, the electrode pieces 31A, 31B, 32A, and 32B move individually. It can make it easy to contact. Thereby, the charging / discharging efficiency of the alkaline livestock battery 100 can be improved.
- the slit formed by the electrode pieces 31A and 31B of the positive electrode plate 31 and the slit formed by the electrode pieces 32A and 32B of the negative electrode plate 32 are provided at the same position in the circumferential direction.
- the group 3 can be easily expanded and contracted.
- the present invention is not limited to the first embodiment.
- the positive electrode plate and the negative electrode plate are divided into two equal parts, but the left and right dimensions of the two electrode pieces may be different from each other.
- the positive electrode plate or the negative electrode plate may be divided into three or more parts.
- FIG. 5 shows a case of three divisions (electrode pieces 31A to 31C and electrode pieces 32A to 32C).
- segmentation number of an electrode piece is increased, the contact with each electrode piece and a separator can be made still more reliable.
- the slit formed by the electrode pieces 31A and 31B of the positive electrode plate 31 and the slit formed by the electrode pieces 32A and 32B of the negative electrode plate 32 are arranged at different positions in the circumferential direction. May be.
- the outer peripheral surface of the electrode plate group 3 is pressed against the inner peripheral surface of the battery case 2 or the positive electrode plate 31 and the negative electrode plate 32 constituting the electrode plate group 3 are pressed through the separator 33.
- the positive electrode plate 31 and the negative electrode plate 32 can be made difficult to loosen later. Accordingly, it is possible to prevent a decrease in charge / discharge efficiency of the battery or a dropout of the positive electrode or negative electrode active material over a long period of time.
- the slits formed by the electrode pieces 31A and 31B of the two positive electrode plates 31 face the same direction in the circumferential direction, and the slits formed by the electrode pieces 32A and 32B of the two negative electrode plates 32 are peripheral. Although they are configured to face the same direction in the direction, they may be arranged at different positions in the circumferential direction.
- the electrode plate group of the first embodiment has a double structure, it may have a single structure or a triple structure or more.
- the single-layer structure that is, by making the positive electrode plate 31 and the negative electrode plate 32 one turn, the amount of use of the base material of the positive electrode plate 31 and the negative electrode plate 32 and the separator 33 can be greatly reduced. It is also possible to reduce the number of manufacturing steps such as entrainment.
- the positive electrode plate and the negative electrode plate are divided into a plurality of electrode pieces, but either one may be divided into a plurality of electrode pieces.
- the positive electrode plate located inside the separator is divided, the positive electrode plate can be easily pressed against the separator from the inner side, and the electrode plate group can be pressed.
- the secondary battery 100 according to the second embodiment is different from the above-described embodiment in the configuration of the electrode plate group 3, particularly in the configuration of the positive electrode plate 31.
- the electrode plate group 3 of the present embodiment is formed by concentrically forming a one-turn wound positive electrode plate 31 and a one-turn wound negative electrode plate 32 with a separator 33 made of, for example, a polyolefin non-woven fabric. It has the single structure which makes
- the separator is impregnated with an electrolytic solution such as potassium hydroxide.
- the positive electrode plate 31 in contact with the inner peripheral surface of the separator 33 is divided into two electrode pieces 31A and 31B that are equally divided in the circumferential direction, and these electrode pieces 31A and 31B. 1 has a connecting portion 31C that functions as a current collecting terminal 311 that connects the upper ends of one of the adjacent sides 31A1 and 31B1 adjacent to each other, and has a substantially C-shape when viewed in the axial direction.
- the positive electrode plate 31 uses a perforated steel plate as a base material, and the current collector portions 31A2 and 31B2 and the connecting portion 31C of the electrode pieces 31A and 31B are integrally formed of the perforated steel plate.
- the positive electrode plate 31 includes two electrode pieces 31 ⁇ / b> A and 31 ⁇ / b> B having the same rectangular shape adjacent to the left and right in the unfolded state before being accommodated in the battery case 2.
- the electrode pieces 31A and 31B have a connecting portion 31C that connects the upper ends of adjacent sides 31A1 and 31B1 adjacent to each other and has a rectangular shape extending outward in the upward direction.
- These electrode pieces 31A and 31B are configured such that the upper and lower sides along the left and right direction as the sides in the axial direction are longer than the left and right sides along the up and down direction as the sides in the circumferential direction.
- the positive electrode plate 31 has a symmetrical shape with respect to the central axis of the connecting portion 31C.
- the alkaline storage battery 100 is disposed in the hollow portion 3X of the electrode plate group 3, contacts the inner peripheral surface 3m of the electrode plate group 3, and the electrode plate. It is preferable to include a holding member 6 that holds the outer peripheral surface 3n of the group 3 in contact with the inner peripheral surface 2m of the battery case 2.
- the holding member 6 is in contact with the inner peripheral surface 3 m of the electrode plate group 3, in this embodiment, the entire inner peripheral surface of the positive electrode plate 31 positioned at the innermost periphery.
- the holding member 6 made of a flat plate is curved and deformed into a cylindrical shape and is disposed in the hollow portion 3X of the electrode plate group 3, so that the outer peripheral surface 6n of the holding member 6 is made into an electrode plate by its elastic restoring force.
- the holding member 6 is preferably in contact with the entire inner peripheral surface 3m of the electrode plate group 3 so that its length dimension is not less than the inner peripheral length of the hollow portion 3X of the electrode plate group 3,
- the width dimension is desirably substantially equal to the axial length of the hollow portion 3X of the electrode plate group 3. Since the holding member 6 is configured by deforming one plate into a cylindrical shape in this way, the space in the battery 100 can be increased, and an increase in battery internal pressure can be prevented.
- the positive electrode plate 31 configured as described above will be briefly described.
- the linear uncoated portions X1 that become the current collecting terminals 311 are left in the central portion along the longitudinal direction, and both sides thereof are left.
- the positive electrode active material is applied to the coating portions X2 and X3.
- punching is performed using a mold having the same shape as the developed state of the positive electrode plate 31.
- the thick line indicates the punched shape.
- each positive electrode plate 31 can be punched so that its punching region is continuous, and the punching loss is almost reduced. It can be lost.
- one negative electrode plate 32 is deformed into a cylindrical shape and accommodated in the battery case 2.
- the positive electrode plate 31 manufactured as described above is formed into a semicircular shape by bending the electrode pieces 31A and 31B of the positive electrode plate 31 with a press die in the vertical direction, and the connecting portion 31C.
- a substantially cylindrical shape is obtained by folding the current collector terminal 311 in the left-right direction around the current collector terminal 311.
- the positive electrode plate 31 thus deformed is accommodated in the bag-shaped separator 33 so that the current collecting terminal 311 is positioned on the upper side, and is accommodated in the negative electrode plate 32.
- the holding member 6 deformed into a cylindrical shape smaller than the inner diameter of the hollow portion 3X is disposed in the hollow portion 3X of the electrode plate group 3.
- the electrode plate group 3 can be fixed to the battery case 2.
- an electrolytic solution is injected.
- the current collecting terminal 311 of the positive electrode plate 31 is connected to the back surface of the sealing body 5, and the sealing body 5 is fixed to the upper opening of the battery case 2 via the insulator 4 by caulking or the like.
- the electrolytic solution may be injected after the electrode plate group 3 is accommodated in the battery case 2 and the holding member 6 is disposed.
- the cylindrical positive electrode plate 31 may be arranged after the separator 33 is arranged in the negative electrode plate 32 in advance.
- the positive electrode plate 31 that contacts the inner peripheral surface of the separator 33 is divided into two electrode pieces 31A and 31B in the circumferential direction.
- the electrode piece portions 31A and 31B are pressed from the inside toward the inner peripheral surface of the separator 33, the electrode piece portions 31A and 31B move individually, thereby making it easier to press (squeeze) the electrode plate group 3. be able to.
- the charging / discharging efficiency of the alkaline livestock battery 100 can be improved.
- the usage amount of the base material of the positive electrode plate 31 and the negative electrode plate 32 and the separator 33 can be greatly reduced, and the man-hours of manufacture such as entrainment thereof Can also be reduced.
- the present invention is not limited to the second embodiment.
- the positive electrode plate is divided into two equal parts, but the left and right dimensions of the two electrode pieces may be different from each other. Further, the positive electrode plate may be divided into three or more parts.
- FIG. 12 shows the case of four divisions. As shown in FIG. 12, a part of the electrode pieces 31D to 31G adjacent to each other is connected by connecting portions 31H to 31J (the connecting portion 31H is a current collecting terminal 311), and is roughly C-shaped when viewed from the axial direction. It is configured to have a shape. When the number of divisions of the electrode piece portions is increased in this way, each electrode piece portion is more easily moved and the pressing of the electrode plate group can be further ensured.
- the manufacturing method of the positive electrode plate 31 in the case of dividing into four will be briefly described.
- the straight uncoated portions X11 to X13 that become the connecting portions 31H to 31J are left at the center along the longitudinal direction.
- a positive electrode active material is applied to both sides to form coating portions X2 to X5.
- die which makes the same shape as the expansion
- the electrode pieces 31D to 31G of the positive electrode plate 31 are bent in a vertical direction so as to be partially arc-shaped, and are roughly folded by zigzag around the connecting portions 31H to 31J. Make it cylindrical.
- the positive electrode plate 31 is bent in the left-right direction into a semicircular shape, and is folded in the left-right direction around the current collecting terminal 311 so as to have a substantially cylindrical shape and accommodated in the battery case 2. You may comprise so that it may do. With such a configuration, the work of winding up the positive electrode plate can be further simplified.
- connection part 31C served as the current collection terminal 311
- the position where the connecting portion 31C is provided is not limited to the upper end portion in the adjacent sides 31A1 and 31B1, but the electrode piece portion is most easily moved when provided in the end portions in the adjacent sides 31A1 and 31B1.
- the negative electrode plate may be divided in the same manner as the positive electrode plate.
- each electrode piece moves individually, so that each electrode piece can be easily brought into contact with the inner peripheral surface of the battery case. be able to.
- a slit may be formed in the current collecting terminal 311 so that the current collecting terminal 311 can be easily bent.
- a plurality of slits may be formed along the width direction orthogonal to the longitudinal direction of the current collecting terminal 311.
- the electrode plate group is configured in the order of the positive electrode plate, the separator, and the negative electrode plate from the inner side, but may be configured in the order of the negative electrode plate, the separator, and the positive electrode plate from the inner side. good.
- the negative electrode plate is divided into a plurality of electrode pieces as in the above embodiment.
- the positive electrode and the negative electrode of the second embodiment were configured by applying an active material to a perforated steel sheet, but were also configured by filling an active material in a foamed substrate such as a nickel hole. It may be a thing.
- the positive electrode may be formed by compressing the active material powder into a predetermined shape (cylindrical shape composed of a plurality of electrode pieces) and collecting current through a current collector plate.
- the holding member may have an outer peripheral surface shaped to be fitted to the inner peripheral surface of the electrode plate group in a state where the outer peripheral surface of the electrode plate group is in contact with the inner peripheral surface of the battery case.
- it may be a resin or metal cylindrical body or columnar body having substantially the same shape as the inner peripheral surface of the electrode plate group (having an outer diameter substantially the same diameter as the inner peripheral surface). If it is such, the effect similar to the said embodiment can be acquired by fitting a holding member in the hollow part of the electrode group accommodated in the battery case.
- the electrode plate group is configured in the order of the positive electrode plate, the separator, and the negative electrode plate from the inner side, but may be configured in the order of the negative electrode plate, the separator, and the positive electrode plate from the inner side.
- the positive electrode and the negative electrode of the above embodiment are configured by applying an active material to a perforated steel sheet, but are also configured by filling an active material in a foamed substrate such as a nickel hole. There may be.
- the positive electrode may be formed by compressing the active material powder into a predetermined shape (cylindrical shape composed of a plurality of electrode pieces) and collecting current through a current collector plate.
- the holding member may have an outer peripheral surface shaped to be fitted to the inner peripheral surface of the electrode plate group in a state where the outer peripheral surface of the electrode plate group is in contact with the inner peripheral surface of the battery case.
- it may be a resin or metal cylindrical body or columnar body having substantially the same shape as the inner peripheral surface of the electrode plate group (having an outer diameter substantially the same diameter as the inner peripheral surface). If it is such, the effect similar to the said embodiment can be acquired by fitting a holding member in the hollow part of the electrode group accommodated in the battery case.
- the present invention can be applied to secondary batteries such as lithium ion secondary batteries in addition to alkaline storage batteries, or may be applied to primary batteries.
- the positive electrode or the negative electrode in a cylindrical battery, can be easily pressed, and the discharge efficiency (in the case of a primary battery) or the charge / discharge efficiency (in the case of a secondary battery) can be improved.
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- Manufacturing & Machinery (AREA)
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Abstract
Description
2・・・電池ケース
3・・・極板群(極群)
31・・・正極板(正極)
31A、31B・・・正極板の電極片
32・・・負極板(負極)
32A、32B・・・負極板の電極片
33・・・セパレータ
以下に本発明に係る二次電池の第1実施形態について図面を参照して説明する。
まず負極板32の2枚の電極片32A、32Bを、プレス金型を用いてそれぞれ半円筒状に変形させ(図4参照)、電池ケース2内に収容する。そして、円筒状に巻かれたセパレータ33を電極片32A、32Bの径方向内側に収容する。次に、正極板31の2枚の電極片31A、31Bを、プレス金型を用いてそれぞれ半円筒状に変形させ(図4参照)、それぞれ半円筒状に変形させて電池ケース2内においてセパレータ33の径方向内側に収容する。この作業を繰り返すことにより、2周巻きの正極板31及び2周巻きの負極板32をセパレータ33を介して同心円状に電池ケース2内に収容する。そして、電解液を注液する。その後、極板群3の中空部3X内に、当該中空部3Xの内径よりも小さい円筒状に変形された保持部材6を配置する。これにより極板群3を電池ケース2に固定させることができる。そして負極板32の電極片32A、32Bの集電端子321を電池ケース2の底面に接続し、正極板31の電極片31A、31Bの集電端子311を封口体5の裏面に接続するとともに当該封口体5を絶縁体4を介して電池ケース2の上部開口にかしめ等により固定する。なお、極板群3を電池ケース2に収容し保持部材6を配置した後に、電解液を注液しても良い。
例えば、前記第1実施形態では、正極板及び負極板を2等分割するものであったが、2つの電極片の左右寸法が互いに異なるものであっても良い。また、正極板又は負極板を3分割以上したものであっても良い。ここで、3分割した場合(電極片31A~31C及び電極片32A~32C)を図5に示す。このように電極片の分割数を増加させると、各電極片とセパレータとの接触をより一層確実にすることができる。
次に、本発明に係る二次電池の第2実施形態について図面を参照して説明する。なお、前記第1実施形態と同一又は対応する部材には、同一の符号を付している。
まず、図10に示すように、長尺形状をなす母材Xに対して、その長手方向に沿って中心部に集電端子311となる直線状の未塗工部X1を残して、その両側に正極活物質を塗工して塗工部X2、X3を形成する。そして、前記正極板31の展開状態と同一形状をなす金型を用いて打ち抜いていく。なお、図10において太線が打ち抜き形状を示している。ここで、電極片部31A、31Bの上下寸法L1と連結部31Cの上下寸法L2とが等しいことから、各正極板31をその打ち抜き領域が連続するように打ち抜くことができ、打ち抜きのロスをほぼ無くすことができる。
まず1枚の負極板32を円筒状に変形させて電池ケース2内に収容する。また、上記のとおり製造した正極板31を、図11に示すように、正極板31の電極片部31A、31Bをプレス金型により上下方向に湾曲させて半円状にするとともに、連結部31C(集電端子311)を中心として左右方向に折り畳むことによって、概略円筒状にする。このように変形させた正極板31を集電端子311が上側に位置するように袋状のセパレータ33に収容して負極板32内に収容する。その後、極板群3の中空部3X内に、当該中空部3Xの内径よりも小さい円筒状に変形された保持部材6を配置する。これにより極板群3を電池ケース2に固定させることができる。そして、電解液を注液する。そして正極板31の集電端子311を封口体5の裏面に接続するとともに、当該封口体5を絶縁体4を介して電池ケース2の上部開口にかしめ等により固定する。なお、極板群3を電池ケース2に収容し保持部材6を配置した後に、電解液を注液しても良い。また、セパレータ33が袋状のものでない場合には、セパレータ33を予め負極板32内に配置した後に、円筒状の正極板31を配置するようにしても良い。
例えば、前記第2実施形態では、正極板を2等分割するものであったが、2つの電極片部の左右寸法が互いに異なるものであっても良い。また、正極板を3分割以上したものであっても良い。ここで、4分割した場合を図12に示す。図12に示すように、互いに隣接する電極片部31D~31Gの一部を連結部31H~31J(連結部31Hを集電端子311とする)により連結して、軸方向から見て概略C字形状をなすように構成する。このように電極片部の分割数を増加させると、各電極片部がより一層移動し易くなり極板群の押圧を一層確実にすることができる。
Claims (12)
- 円筒状の電池ケースと、
正極、負極及びセパレータを有する円筒状の極群とを備え、
前記極群の内側に空間が形成されており、
前記正極又は前記負極が、周方向において複数の電極片に分割されていることを特徴とする円筒形電池。 - 前記正極又は前記負極が、半周以下の周方向長さを有する複数の電極片に分割されている請求項1記載の円筒形電池。
- 前記正極又は前記負極が、周方向の辺より前記極群の巻回軸方向の辺の方が長い請求項1又は2記載の円筒形電池。
- 前記正極又は前記負極が、多数の貫通孔を有する金属板を基材とするものである請求項1乃至3の何れかに記載の円筒形電池。
- 前記正極又は前記負極が、2つの電極片に分割されている請求項1乃至4の何れかに記載の円筒形電池。
- 前記正極又は前記負極が、周方向に分割された複数の電極片部及び互いに隣接する電極片部の一部同士を連結する連結部を有する請求項1乃至5の何れかに記載の円筒形電池。
- 前記連結部が集電端子を兼ねている請求項6記載の円筒形電池。
- 前記正極又は前記負極が、多数の貫通孔を有する金属板を基材とするものであり、
前記電極片及び前記連結部が一体成形されている請求項6又は7記載の円筒形電池。 - 前記電極片の周方向の辺が前記連結部により連結されている請求項6乃至8の何れかに記載の円筒形電池。
- 前記極群の巻回軸に対して、前記連結部が垂直に配置されている請求項6乃至9の何れかに記載の円筒形電池。
- 前記連結部にスリットが設けられている請求項6乃至10の何れかに記載の円筒形電池。
- 前記正極又は前記負極が、展開した状態において、複数の電極片部及びこれら電極片部において互いに隣接する隣接辺の上端部同士を連結するとともに上方向外側に延設された矩形状をなす連結部を有し、
前記電極片部の上下寸法と前記連結部の上下寸法とが等しい請求項6乃至11の何れかに記載の円筒形電池。
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CN201280042986.8A CN103782438A (zh) | 2011-09-14 | 2012-09-04 | 圆筒形电池 |
EP12831663.5A EP2757624A4 (en) | 2011-09-14 | 2012-09-04 | CYLINDER BATTERY |
US14/344,144 US20140349158A1 (en) | 2011-09-14 | 2012-09-04 | Cylindrical battery |
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US11469441B2 (en) | 2017-03-17 | 2022-10-11 | Dyson Technology Limited | Energy storage device |
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JP7194687B2 (ja) | 2017-03-17 | 2022-12-22 | ダイソン・テクノロジー・リミテッド | エネルギー蓄積デバイス |
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CN103782438A (zh) | 2014-05-07 |
JPWO2013038946A1 (ja) | 2015-03-26 |
EP2757624A1 (en) | 2014-07-23 |
EP2757624A4 (en) | 2015-04-22 |
US20140349158A1 (en) | 2014-11-27 |
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