WO2012014929A1 - Cylindrical lithium-ion battery - Google Patents

Cylindrical lithium-ion battery Download PDF

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Publication number
WO2012014929A1
WO2012014929A1 PCT/JP2011/067077 JP2011067077W WO2012014929A1 WO 2012014929 A1 WO2012014929 A1 WO 2012014929A1 JP 2011067077 W JP2011067077 W JP 2011067077W WO 2012014929 A1 WO2012014929 A1 WO 2012014929A1
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WO
WIPO (PCT)
Prior art keywords
ion battery
cylindrical lithium
energization path
lithium ion
current collecting
Prior art date
Application number
PCT/JP2011/067077
Other languages
French (fr)
Japanese (ja)
Inventor
剛也 伊藤
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三洋電機株式会社
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Publication of WO2012014929A1 publication Critical patent/WO2012014929A1/en

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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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • 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 lithium ion battery, and more particularly to an electrical conduction structure that connects a sealing body that also serves as an external output terminal and one electrode plate.
  • a cylindrical lithium ion battery is a secondary battery in which a spiral electrode body in which a strip-like positive electrode plate and a negative electrode plate are wound in a spiral shape with a separator interposed therebetween is housed in a cylindrical battery can.
  • the current collector tab is welded to the positive and negative electrode plates, respectively, and the bottom portion of the sealing body that serves as the external output terminal as the current collector tab of one electrode The current collector tab of the other electrode is connected to the bottom of the can.
  • Patent Documents 1 to 4 technologies related to the current collector tab and the current collector connection structure.
  • the batteries described in Patent Documents 1, 3 and 4 allow a large current to flow through the battery by adopting a method in which a current collector is welded to a core body exposed on one end face in the spiral axis direction of the electrode body. Can do.
  • a battery current collector in which the current collecting tab is not led out from the inside of the electrode body does not need to consider interference with the electrode plate of the current collecting tab inside the electrode body. Therefore, in the design of such a battery current collector, the current collector can be increased in thickness and width (ie, area and cross-sectional area) as much as possible in order to flow a large current. It is not usually assumed that the body itself cuts.
  • an insulating plate is disposed on the end face of the spiral electrode body, and from the one electrode of the spiral electrode body.
  • a structure is adopted in which the drawn current collecting tab is taken out to the sealing body through a through hole provided in the insulating plate, and this through hole needs to maintain an insulating function, and can be made large enough to pass a wide current collecting tab. Can not.
  • a method of reducing the electrical resistance by increasing the thickness of the current collecting tab is also conceivable.
  • a current collecting tab with a large thickness is difficult to bend and deforms and has poor handleability, and a cutting blade used for cutting processing. Therefore, it is necessary to frequently replace the cutting blade during the manufacturing operation. Therefore, the method using the thick current collecting tab has a problem of deteriorating the manufacturing workability.
  • the present invention has devised a highly reliable current path structure that is not melted and cut even when a large current is applied, thereby reducing the battery structure and manufacturing workability of a cylindrical lithium ion battery that supports a large current discharge. It aims to be realized.
  • the present invention for solving the above problems is configured as follows.
  • An electrode body in which one electrode plate and the other electrode plate having a different polarity from each other are wound through a separator is accommodated in a cylindrical battery can having an opening with a winding axis facing up and down, and a through hole.
  • the cylindrical lithium ion battery having a structure in which an insulating plate having an opening is disposed on the opening side of the electrode body, and the opening is sealed with a sealing body that also serves as an external output terminal of the one electrode plate, the one electrode plate and the external output
  • the energization path between the sealing body which also serves as a terminal is composed of a main energization path and a bypass energization path, and the main energization path has a current collecting tab connected to the one electrode plate through a through hole of the insulating plate.
  • the meandering current collecting tab portion and the seal A current path comprising a current collecting tab in contact with both the body bottom surface, a cylindrical lithium ion battery, characterized in that.
  • a main energization path and a bypass energization path constituted by current collecting tabs are provided between the sealing body and the electrode plate.
  • the current collecting tab and the bypass energization constituting the main energization path are provided.
  • the current collecting tabs constituting the electric circuit may be constituted by a single continuous belt-like current collecting tab, or each may be constituted by a separate belt-like current collecting tab.
  • the metal current collector tab is bent to meander in the narrow gap between the upper surface of the insulating plate and the bottom surface of the sealing body, the length of the tab becomes longer and the outer surface is pulled by both. Since it extends, the thickness (metal density) of the portion is reduced, and the electrical resistance of the portion is increased. For this reason, when a large current flows, the bent portion generates more heat.
  • the bent portion becomes an intermediate portion of the conductive path, so that the electric resistance heat generated before and after the portion gathers in the portion.
  • the bent portion is a portion that is easier to be melted and cut than the other portions.
  • the electrical resistance should be reduced.
  • a configuration in which a bypass energization path is provided in a bent portion that is easily melted by heat is adopted.
  • the bypass energization path acts to reduce the amount of heat generated at the bent portion where heat melting is likely to occur. Therefore, cutting of the current collecting tab due to heat generation can be suppressed without increasing the current collecting tab width and without increasing the thickness of the current collecting tab. Therefore, according to the above configuration, it is possible to realize a highly reliable cylindrical lithium ion battery that can handle a large current with almost no increase in cost.
  • the bypass energization path may be constituted by a current collection tab extension portion obtained by further extending the current collection tab constituting the main energization path.
  • a main energization path and a bypass energization path are configured using a single long strip-shaped current collecting tab.
  • the said structure WHEREIN The said bypass electricity supply path which consists of a current collection tab extension part to which the current collection tab which comprises the said main electricity supply path was extended shall contact the said current-collected current collection tab part with elasticity. be able to.
  • the tip of the bypass energizing path can be configured to face the bottom surface direction of the sealing body.
  • bypass energization path may be in contact with the main energization path at a portion other than the tip of the bypass energization path.
  • bypass energization path may be formed of a spiral structure formed by spirally winding the current collecting tab extension.
  • the bypass energizing path when the bypass energizing path is in contact with the meandering current collecting tab portion with elasticity, the meandering portion of the current collecting tab and the current collecting tab portion on the bottom surface or bottom side of the sealing body are in stable contact. Connected. In this case, if the tip of the bypass energization path is directed toward the sealing body bottom surface, which is the opposite side of the electrode body end face, an accident in which the tip of the bypass energization path pierces the electrode body can be prevented.
  • the metal current collecting tab wound in a spiral shape has an elastic force to spread outward
  • the bypass energizing path is constituted by the spiral structure wound in a spiral shape
  • the serpentine portion and the bottom surface of the sealing body or the current collecting tab portion on the bottom surface side are more reliably and stably contact-connected.
  • a spiral structure is a structure formed in the extension part, after the current collector tab main body part is welded to the bottom part of the sealing body, the sealing body is easily fitted into the battery can opening. Can form a bypass energization path. This is because the spiral structure expands in the battery and forms a bypass current path by itself.
  • the tip of the current collector tab is housed in the spiral, so even if a vibration shock is applied when the battery is dropped, the tip of the current collector tab is in the battery. Accidents that pierce other elements do not occur.
  • the spiral shape includes a state where the winding is less than one turn, and such a configuration is possible, and it is obvious that the same effect can be obtained.
  • the novel current collecting tab current path structure according to the present invention is a current collecting tab that uses a conventional current collecting tab and does not modify the battery structure other than the current collecting tab current path, and collects current by a large current that flows instantaneously in the current path system. It is possible to prevent an accident that the electric tab is cut off by heating. In applications such as electric tools and electric vehicles, a large current instantaneously flows when a large torque is required, and this current easily melts and cuts the vicinity of the midpoint of the current-carrying path. Troubles caused by melt cutting of a simple energization path can be suppressed.
  • FIG. 1 is a partially exploded perspective view of a cylindrical lithium ion battery of Example 1.
  • FIG. FIG. 2 is a schematic cross-sectional view for explaining a battery assembly state for forming the current collecting tab energizing path structure according to the first embodiment.
  • FIG. 3 is a schematic cross-sectional view illustrating the current collecting tab current path structure according to the first embodiment.
  • FIG. 4 is a schematic cross-sectional view for explaining a battery assembly state for forming the current collecting tab energizing path structure according to the second embodiment.
  • FIG. 5 is a schematic cross-sectional view illustrating a current-carrying path structure including current collecting tabs according to the second embodiment.
  • FIG. 6 is a schematic cross-sectional view for explaining a current collecting tab energizing path according to the prior art.
  • FIG. 7 is a schematic cross-sectional view showing a current collecting tab energization path according to the prior art.
  • FIG. 1 is a cross-sectional disassembled perspective view of a cylindrical lithium ion battery according to Embodiment 1 of the present invention.
  • this battery has a bottomed cylindrical battery can 1 having an opening, a spiral electrode body 2 accommodated in the cylindrical battery can 1, and a cylindrical battery can 1. It consists of an electrolytic solution, an insulating plate 7 having a through-hole disposed above the spiral electrode body 2, and a sealing body 6 that seals the opening of the cylindrical battery can 1.
  • positive and negative electrode plates 3 and 4 are wound through a separator 5, and the positive and negative electrode plates 3 and 4 have active materials on the front and back surfaces of a long metal core. It is made by painting.
  • the positive and negative electrode plates 3 and 4 are formed with exposed core portions to which no active material is applied, and band-like positive and negative current collecting tabs are connected to this portion by, for example, a welding method.
  • the spiral electrode body 2 is accommodated in the cylindrical battery can 1 so that the positive electrode current collecting tab 30 led out from the positive electrode plate 3 is located on the sealing body 6 side.
  • the sealing body 6 that seals the opening of 1 also serves as a positive electrode external output terminal.
  • the positive electrode current collecting tab 30 whose one end is connected to the positive electrode plate 3 so as to be energized is led out to a space sandwiched between the insulating plate 7 and the bottom of the sealing body 6 through the through hole of the insulating plate 7, and the space is meandered.
  • a state a state having slackness
  • the bottom of the sealing body 6 is connected to be energized.
  • an ultrasonic welding method is used for this connection.
  • the positive electrode current collecting tab 30 of the battery of Example 1 extends ahead of the welded portion to the bottom of the sealing body 6, and the current collecting tab portion extending ahead of the welded portion has a spiral shape.
  • the spiral structure 30c is formed by being wound.
  • the spiral structure 30c is in contact with the bottom of the sealing body and the current collecting tab portion facing the sealing body, thereby forming a bypass conductive path, which is another current path.
  • FIG. 2 (a) shows the state before the sealing body 6 is fitted into the opening of the battery can 1, and the positive current collecting tab 30 having the current collecting tab main body 30a and the current collecting tab extension 30b is the bottom of the sealing body.
  • FIG. 2B is a front cross-sectional view conceptually showing a state welded to the welded portion 10 of FIG. 2, and FIG. 2B is a view showing a state where the current collecting tab extension 30b is wound in a spiral shape. It is side surface sectional drawing with respect to 2 (a).
  • FIG. 3 is a battery cross-sectional view conceptually showing an energization path after the sealing body 6 is fitted into the opening of the battery can 1 and the battery can 1 is sealed.
  • the positive electrode current collecting tab 30 derived from the positive electrode plate 3 has a different function for each part, the function is identified by giving a different name. That is, the portion from the lead-out start end from the positive electrode plate to the connecting portion at the bottom of the sealing body 6 is referred to as a current collecting tab main body (30a), and the current collecting tab from the welding portion (or connecting portion) at the bottom of the sealing body 6 is referred to. This is called the extension (30b).
  • a part where all or a part of the current collecting tab extension 30b is spirally wound is referred to as a spiral structure 30c, and a part where the current collecting tab extension 30b is bent is a bent structure 30d (Example 2). Reference).
  • the current collecting tab main body 30a is a portion that becomes a main conductive path for conducting electricity from the positive electrode plate 3 to a sealing body that also serves as an external output terminal.
  • the main conductive path from the positive electrode plate 3 to the bottom of the sealing body 6 meanders the gap between the insulating plate 7 and the bottom of the sealing body 6 so that the current collecting tab is loosened. This is because, when the positive electrode plate 3 and the bottom of the sealing body 6 are connected at the shortest distance, when the electrode body 2 moves up and down due to a battery drop or the like, a large tension is applied to the current collecting tab and it is cut. .
  • the current collecting tab extension 30b is spirally wound to form a spiral structure 30c.
  • the spiral structure 30c has a force (expanded outward) to release the spiral. The power to try) is always working. Accordingly, when the bottom of the sealing body 6 is fitted into the opening of the battery can 1 with the spiral shown in FIG. 2B held, the spiral expands within the battery, and a part of the current collecting tab main body 30a. And the bottom of the sealing body 6 (see FIG. 3). As a result, a bypass conductive path which is the second conductive path is formed.
  • a positive electrode active material slurry was prepared by mixing N-methyl-2-pyrrolidone with a mixture of 95 parts by mass of lithium cobaltate as a positive electrode active material and 5 parts by mass of a paste material. This slurry was applied to both surfaces of a positive electrode core made of an aluminum foil having a width of 55 mm, a length of 880 mm, and a thickness of 0.02 mm by a doctor blade method. At this time, a region where the active material is not applied (core exposed portion) is formed on one end side of the positive electrode core.
  • the coated layer was dried and compressed with a compression roller, and then an aluminum positive electrode current collector tab having a width of 3 mm, a length of 76 mm, and a thickness of 0.15 mm was ultrasonically welded to the core exposed portion.
  • a positive electrode plate 3 with a current collecting tab having an active material layer thickness of 0.10 mm was produced.
  • ⁇ Preparation of negative electrode plate> Water was mixed with a mixture of 98 parts by mass of natural graphite powder as a negative electrode active material and 2 parts by mass of a paste material to prepare a negative electrode active material slurry. This slurry was applied to both surfaces of a negative electrode core made of a copper foil having a width of 57 mm, a length of 960 mm, and a thickness of 0.01 mm by a doctor blade method. At this time, regions (core exposed portions) where no active material was applied were formed at both ends of the negative electrode core.
  • the coated layer was dried and compressed with a compression roller, and then a nickel negative electrode current collecting tab having a width of 3 mm, a length of 50 mm, and a thickness of 0.10 mm was ultrasonically welded to the core exposed portion.
  • a nickel negative electrode current collecting tab having a width of 3 mm, a length of 50 mm, and a thickness of 0.10 mm was ultrasonically welded to the core exposed portion.
  • a separator having a width of 59 mm, a length of 2000 mm, and a thickness of 0.022 mm is interposed between the positive electrode plate with current collecting tab and the negative electrode plate with current collecting tab, and both electrode plates are spirally wound to form a spiral electrode body 2.
  • the spiral electrode body 2 was accommodated in the cylindrical battery can 1 with the negative electrode current collection tab side facing the bottom of the can, and the negative electrode current collection tab 40 was electrically resistance welded to the bottom of the battery can 1. After the insulating plate 7 was placed on the upper part of the spiral electrode body 2 through the positive electrode current collecting tab 30 through the through hole, the sealing body 6 was welded.
  • the electrolytic solution was injected into the cylindrical battery can 1, the sealing body 6 was fitted into the opening of the cylindrical battery can 1 through a resin gasket, and the opening was sealed by a method of caulking the periphery of the opening. Thereby, the cylindrical lithium ion battery according to Example 1 was completed (see FIGS. 1 and 3).
  • the battery had an outer diameter of 18 mm, a height of 65 mm, and a battery capacity of 1300 mAh.
  • Example 2 is the same as Example 1 above in that a current collecting tab having a current collecting tab extension (30b) is used, but Example 2 is shown in FIGS. 4 (a) and 4 (b). Thus, it differs from Example 1 in the point whose current collection tab extension part is a bending structure (30d).
  • the extension part of Example 2 was not spiral, but was bent into a shape in which the extension part (30b) was in contact with the current collector tab body part 30a when the sealing body 6 was fitted into the battery can opening. It is a bent structure (see FIGS. 4 and 5). About the other matter, it carried out similarly to the case of Example 1, and produced the cylindrical lithium ion battery concerning Example 2 which has a bypass electricity supply path.
  • the current collecting tab extension 30b is a part for forming a bypass energization path.
  • the current collecting tab extension 30b has a spiral elastic structure, and in the second embodiment has a bending elastic structure.
  • the structure is not limited to these structures as long as the bypass current path can be formed.
  • Example 1 Cylindrical lithium in the same manner as in Example 1 except that an aluminum foil having a width of 3 mm, a length of 66 mm, and a thickness of 0.15 mm was used as the positive electrode current collector tab and the current collector tab extension was not formed. An ion battery was produced.
  • the positive electrode current collecting tab used in Comparative Example 1 is the same as the current collecting tab used in Examples 1 and 2 except that the length is short.
  • the cylindrical lithium ion battery of Comparative Example 1 is a positive electrode current collecting tab. The only difference from the first and second embodiments is that the electric system does not have a bypass current path.
  • the batteries of Example 1 and Comparative Example 1 were subjected to a thermal fusing test.
  • a thermal fusing test a battery in a charged state is connected to a DC load, and a current value of 110A, 120A, 130A, 140A, or 150A is passed for 3 seconds to check whether the positive electrode current collecting tab is thermally fused.
  • the thermal fusing test results are shown in Table 1.
  • Example 1 thermal fusing was confirmed for the first time at 150A. In contrast, in Comparative Example 1, thermal fusing was confirmed at a current value of 130A. From this result, even when a current collecting tab with the same material, tab width and tab thickness is used, the current value at which thermal fusing occurs can be significantly increased by forming a bypass energizing path. I understand. In Example 2, the same result as in Example 1 was obtained.
  • the main energization path and the bypass energization path are formed using a single strip-shaped current collection tab.
  • the current collection tab and the bypass energization path that form the main energization path are formed.
  • the current collecting tab may be separated.
  • the dimensions of the current collector tab are not specified in advance. It may be set appropriately according to the battery capacity and the size of the battery. For example, for a wound electrode body housed in a cylindrical battery having an outer diameter of 18 mm and a height of 65 mm, The width is 2 to 5 mm and the thickness is 0.1 to 0.2 mm.
  • the material of the current collecting tab aluminum or an aluminum alloy mainly composed of aluminum is preferably used for the positive current collecting tab, and preferably copper or copper alloy, nickel or nickel alloy, or these are pasted on the negative current collecting tab. Combined clad material is used.
  • the length of the current collecting tab exposed from the electrode body is preferably 20 to 30 mm in total of the main energizing path and the bypass energizing path. However, this length may be appropriately set according to the size of the battery.
  • a cylindrical lithium ion battery capable of discharging a large current using a conventional current collecting tab without preparing a new member and without modifying the battery structure other than the current collecting tab current path. Can be realized.
  • Such a battery of the present invention has great applicability in applications that require a large current, such as electric tools and electric vehicles.

Abstract

[Problem] To provide a cylindrical lithium-ion battery equipped with a conducting path capable of flowing a large current without reducing the assembly workability of the battery. [Solution] The cylindrical lithium-ion battery has a structure in which an electrode body wound in a spiral shape is housed in a cylindrical battery can having an opening while orienting the winding axis in an upper and lower direction, an insulating plate having a through-hole is disposed on the opening side of the electrode body, and the opening is sealed by a sealing body which is also used as the external output terminal of one electrode plate. In the cylindrical lithium-ion battery, the conducting path between the one electrode plate and the sealing body which is also used as the external output terminal consists of a main conducting path and a bypass conducting path. The main conducting path is formed such that a collector tab connected to the one electrode plate is led through the through-hole of the insulating plate to a space between the upper surface of the insulating plate and the bottom surface of the sealing body and is connected to a connection region on the bottom surface of the sealing body while meandering in the space. The bypass conducting path is formed as a collector tab contacting both the meandering collector tab portion and the bottom surface of the sealing body.

Description

円筒形リチウムイオン電池Cylindrical lithium-ion battery
　本発明は、円筒形リチウムイオン電池に関し、詳しくは外部出力端子を兼ねる封口体と一方電極板とをつなぐ電気導通構造に関する。 The present invention relates to a cylindrical lithium ion battery, and more particularly to an electrical conduction structure that connects a sealing body that also serves as an external output terminal and one electrode plate.
　円筒形リチウムイオン電池は、帯状の正極板と負極板とをセパレータを挟んで渦巻き状に巻き取った渦巻電極体を円筒形の電池缶に収容した二次電池である。渦巻電極体を用いたこの種の電池には、下記特許文献２に示すように、集電タブを正負電極板にそれぞれ溶接し、一方極の集電タブを外部出力端子を兼ねる封口体の底部に接続し、他方極の集電タブを缶底に接続する構造が採用されている。 A cylindrical lithium ion battery is a secondary battery in which a spiral electrode body in which a strip-like positive electrode plate and a negative electrode plate are wound in a spiral shape with a separator interposed therebetween is housed in a cylindrical battery can. In this type of battery using a spiral electrode body, as shown in Patent Document 2 below, the current collector tab is welded to the positive and negative electrode plates, respectively, and the bottom portion of the sealing body that serves as the external output terminal as the current collector tab of one electrode The current collector tab of the other electrode is connected to the bottom of the can.
　このような円筒形リチウムイオン電池は、体積エネルギー密度が高く、高容量であるので、電動工具や電気自動車など高容量が要請される分野において広く利用されている。電動工具などでは、駆動開始時などに大トルクを必要とするため、瞬間的に大電流が流れるが、近年、携帯用電動工具などが大型化し、またより大きなパワーを必要とする用途で使用されることが多くなったため、従前に比べ一層大きな電流が流れる機会が増えており、集電タブや集電体やその接続に関して改良が求められている。 Since such a cylindrical lithium ion battery has a high volumetric energy density and a high capacity, it is widely used in fields requiring high capacity such as electric tools and electric vehicles. Electric tools, etc. require a large torque at the start of driving, etc., so a large current flows instantaneously. However, in recent years, portable electric tools have become larger and used for applications that require greater power. Therefore, there is an increased opportunity for a larger current to flow than before, and there is a need for improvements in current collector tabs, current collectors, and their connections.
　集電タブや集電体の接続構造に関する技術としては、下記特許文献１～４がある。 There are the following Patent Documents 1 to 4 as technologies related to the current collector tab and the current collector connection structure.
特開２００４－２５９６２４号公報JP 2004-259624 A 特開２００９－１７０３６５号公報JP 2009-170365 A 実開平５－７２０４８号公報Japanese Utility Model Publication No. 5-72048 特開平１１－１０２６８９号公報Japanese Patent Laid-Open No. 11-102689
　これらの特許文献１、３および４に記載の電池は、電極体の渦巻軸方向の一方端面に露出した芯体に集電体を溶接する方式を採用することで、電池に大電流を流すことができる。集電タブが電極体の内部から導出されない電池の集電体は、電極体内部における集電タブの極板への干渉を考慮する必要がない。したがって、このような電池の集電体の設計において、大電流を流すために集電体の厚さや幅（すなわち面積や断面積）を可能な限り大きくできるので、大電流によるジュール熱で集電体自体が切断することは、通常、想定されない。 The batteries described in Patent Documents 1, 3 and 4 allow a large current to flow through the battery by adopting a method in which a current collector is welded to a core body exposed on one end face in the spiral axis direction of the electrode body. Can do. A battery current collector in which the current collecting tab is not led out from the inside of the electrode body does not need to consider interference with the electrode plate of the current collecting tab inside the electrode body. Therefore, in the design of such a battery current collector, the current collector can be increased in thickness and width (ie, area and cross-sectional area) as much as possible in order to flow a large current. It is not usually assumed that the body itself cuts.
　特許文献２のような集電タブに瞬間的に大電流が流れると、細くて薄い帯状の集電タブからなる通電経路に負荷がかかり、電気抵抗熱が大きくなる。このため、集電タブが溶融切断されるといったトラブルが発生する。 When a large current instantaneously flows through a current collecting tab as in Patent Document 2, a load is applied to a current-carrying path composed of a thin and thin band-shaped current collecting tab, and electric resistance heat increases. For this reason, the trouble that a current collection tab is melt-cut occurs.
　このような集電タブの溶融切断を防ぐ方法として、幅広の集電タブを用いることにより集電タブの電気抵抗を小さくすることが考えられる。 As a method for preventing such melting and cutting of the current collecting tab, it is conceivable to reduce the electric resistance of the current collecting tab by using a wide current collecting tab.
　しかし、この種の円筒形リチウムイオン電池では、一方極から導出した集電タブが他方極に接触するのを防ぐため、渦巻電極体の端面に絶縁板を配置し、渦巻電極体の一方極から導出した集電タブを絶縁板に設けた貫通穴を通して封口体側に取り出す構造が採用されており、この貫通穴は絶縁機能を保持する必要上、幅広の集電タブを通すほどに大きくすることができない。 However, in this type of cylindrical lithium ion battery, in order to prevent the current collecting tab derived from one electrode from coming into contact with the other electrode, an insulating plate is disposed on the end face of the spiral electrode body, and from the one electrode of the spiral electrode body. A structure is adopted in which the drawn current collecting tab is taken out to the sealing body through a through hole provided in the insulating plate, and this through hole needs to maintain an insulating function, and can be made large enough to pass a wide current collecting tab. Can not.
　その一方、集電タブの厚みを厚くして電気抵抗を小さくする方法も考えられるが、厚みが大きい集電タブは、曲げ変形がしにくくなり取扱性が悪いと共に、切断加工に使用するカット刃の消耗が大きくなるので製造作業時にカット刃を頻繁に交換する必要がある。よって、肉厚の厚い集電タブを用いる方法は、製造作業性を悪くするという問題がある。 On the other hand, a method of reducing the electrical resistance by increasing the thickness of the current collecting tab is also conceivable. However, a current collecting tab with a large thickness is difficult to bend and deforms and has poor handleability, and a cutting blade used for cutting processing. Therefore, it is necessary to frequently replace the cutting blade during the manufacturing operation. Therefore, the method using the thick current collecting tab has a problem of deteriorating the manufacturing workability.
　本発明は、上記に鑑み、大電流通電によっても溶融切断されない信頼性の高い通電路構造を案出し、もって大電流放電対応の円筒形リチウムイオン電池を電池構造や製造作業性を低下させることなく実現することを目的とする。 In view of the above, the present invention has devised a highly reliable current path structure that is not melted and cut even when a large current is applied, thereby reducing the battery structure and manufacturing workability of a cylindrical lithium ion battery that supports a large current discharge. It aims to be realized.
　上記課題を解決するための本発明は次のように構成されている。一方電極板とこれとは極性の異なる他方電極板とがセパレータを介して巻回されてなる電極体が巻回軸を上下方向に向け、開口を有する円筒形電池缶内に収容され、貫通穴を有する絶縁板が前記電極体の前記開口側に配置され、前記開口が一方電極板の外部出力端子を兼ねる封口体で封口された構造の円筒形リチウムイオン電池において、前記一方電極板と外部出力端子を兼ねる前記封口体との間の通電路が、主通電路とバイパス通電路とからなり、前記主通電路は、前記一方電極板に接続された集電タブが前記絶縁板の貫通穴を通って前記絶縁板上面と前記封口体底面との空隙内に導かれ、当該空隙内を蛇行した状態で前記封口体底面の接続部位に接続されてなる通電路であり、前記バイパス通電路は、前記蛇行した集電タブ部分と前記封口体底面との双方に接触する集電タブからなる通電路である、ことを特徴とする円筒形リチウムイオン電池。 The present invention for solving the above problems is configured as follows. An electrode body in which one electrode plate and the other electrode plate having a different polarity from each other are wound through a separator is accommodated in a cylindrical battery can having an opening with a winding axis facing up and down, and a through hole. In the cylindrical lithium ion battery having a structure in which an insulating plate having an opening is disposed on the opening side of the electrode body, and the opening is sealed with a sealing body that also serves as an external output terminal of the one electrode plate, the one electrode plate and the external output The energization path between the sealing body which also serves as a terminal is composed of a main energization path and a bypass energization path, and the main energization path has a current collecting tab connected to the one electrode plate through a through hole of the insulating plate. It is an energization path that is led through the gap between the upper surface of the insulating plate and the bottom face of the sealing body, and is connected to a connection portion of the bottom face of the sealing body in a meandering manner in the gap, and the bypass energization path is The meandering current collecting tab portion and the seal A current path comprising a current collecting tab in contact with both the body bottom surface, a cylindrical lithium ion battery, characterized in that.
　この構成では、封口体と電極板との間に集電タブで構成された主通電路とバイパス通電路が設け設けられているが、この構成における主通電路を構成する集電タブとバイパス通電路を構成する集電タブは、連続する一本の帯状の集電タブで構成してもよく、またそれぞれを別個の帯状集電タブで構成してもよい。 In this configuration, a main energization path and a bypass energization path constituted by current collecting tabs are provided between the sealing body and the electrode plate. However, in this configuration, the current collecting tab and the bypass energization constituting the main energization path are provided. The current collecting tabs constituting the electric circuit may be constituted by a single continuous belt-like current collecting tab, or each may be constituted by a separate belt-like current collecting tab.
　主通電路とバイパス通電路の技術的意義について説明する。集電タブで導電経路を形成するこの種の電池では、電池を落下したときなどに生じる電極体の上下動によって、集電タブの切断や、溶接部の剥がれといったトラブルが生じ易い。このため、この種の電池では絶縁板上面と封口体底面との間の空隙内で集電タブを蛇行させ、集電タブに弛みをもたせることによって電極体の上下動に起因する集電タブの切断等を防止している。 技術 Explain the technical significance of the main current path and bypass current path. In this type of battery in which the conductive path is formed by the current collecting tab, troubles such as cutting of the current collecting tab and peeling of the welded portion are likely to occur due to the vertical movement of the electrode body that occurs when the battery is dropped. For this reason, in this type of battery, the current collecting tabs meander in the gap between the top surface of the insulating plate and the bottom surface of the sealing body, and the current collecting tabs are slackened so that the current collecting tabs are loosened. Cutting and so on are prevented.
　しかし、絶縁板上面と封口体底面との間の狭い空隙内を蛇行させるべく、金属製の集電タブを屈曲させると、タブの長さが長くなり、またその外側面が両方に引っ張られて延びるので当該部分の肉厚（金属密度）が薄くなり、当該部分の電気抵抗が大きくなる。このため、大電流が流れると、屈曲部分がより大きく発熱する。 However, if the metal current collector tab is bent to meander in the narrow gap between the upper surface of the insulating plate and the bottom surface of the sealing body, the length of the tab becomes longer and the outer surface is pulled by both. Since it extends, the thickness (metal density) of the portion is reduced, and the electrical resistance of the portion is increased. For this reason, when a large current flows, the bent portion generates more heat.
　また、電池の構造上、屈曲させる部分は導電経路の中間部分になるので、当該部分およびその前後で発生した電気抵抗熱が当該部分に集まる。この結果、屈曲部分は他の部分に比較し溶融切断され易い部分となる。 In addition, because of the structure of the battery, the bent portion becomes an intermediate portion of the conductive path, so that the electric resistance heat generated before and after the portion gathers in the portion. As a result, the bent portion is a portion that is easier to be melted and cut than the other portions.
　ここで集電タブの発熱を少なくするには、その電気抵抗を小さくすればよい。しかし、集電タブの幅を大きくしたり、その肉厚を増す方法は採り難い。なぜなら、電極体の端面には絶縁板が配置されているので、幅広の集電タブを用いる場合には、絶縁板の貫通穴を大きくする必要があるが、絶縁板の貫通穴を大きくすると、絶縁板の絶縁機能が低下するという問題があり、集電タブの肉厚を厚くすると、集電タブの切断加工がし難くなり製造作業性が低下するという問題があるからである。 Here, in order to reduce the heat generation of the current collecting tab, the electrical resistance should be reduced. However, it is difficult to adopt a method for increasing the width of the current collecting tab or increasing its thickness. Because the insulating plate is arranged on the end face of the electrode body, when using a wide current collecting tab, it is necessary to enlarge the through hole of the insulating plate, but if the through hole of the insulating plate is enlarged, This is because there is a problem that the insulating function of the insulating plate is lowered, and when the thickness of the current collecting tab is increased, it is difficult to cut the current collecting tab and there is a problem that manufacturing workability is lowered.
　上記構成においては、主通電路に加え、熱溶融し易い屈曲部分にはバイパス通電路を設ける構成が採用されている。この構成であると、バイパス通電路が熱溶融し易い屈曲部分における発熱量を低下させるように作用する。よって、集電タブ幅を大きくすることなく、また集電タブの肉厚を増すことなく、発熱に起因する集電タブの切断を抑制することができる。それゆえ、上記構成によると、信頼性の高い大電流対応の円筒形リチウムイオン電池を殆どコスト上昇を招くことなく実現することができる。 In the above configuration, in addition to the main energization path, a configuration in which a bypass energization path is provided in a bent portion that is easily melted by heat is adopted. With this configuration, the bypass energization path acts to reduce the amount of heat generated at the bent portion where heat melting is likely to occur. Therefore, cutting of the current collecting tab due to heat generation can be suppressed without increasing the current collecting tab width and without increasing the thickness of the current collecting tab. Therefore, according to the above configuration, it is possible to realize a highly reliable cylindrical lithium ion battery that can handle a large current with almost no increase in cost.
　上記構成において、前記バイパス通電路が、前記主通電路を構成する集電タブを更に延長した集電タブ延長部で構成されているものとすることができる。 In the above-described configuration, the bypass energization path may be constituted by a current collection tab extension portion obtained by further extending the current collection tab constituting the main energization path.
　この構成では、長い一本の帯状の集電タブを用いて、主通電路とバイパス通電路とを構成する。この構成であると、特段のコストアップを招くことなく集電タブの溶融切断を抑制し得た円筒形リチウムイオン電池を実現できる。 In this configuration, a main energization path and a bypass energization path are configured using a single long strip-shaped current collecting tab. With this configuration, it is possible to realize a cylindrical lithium ion battery that can suppress the melt cutting of the current collecting tab without causing a particular increase in cost.
　上記構成において、前記主通電路を構成する集電タブが延長された集電タブ延長部からなる前記バイパス通電路が、弾性を持って前記蛇行した集電タブ部と接触しているものとすることができる。 The said structure WHEREIN: The said bypass electricity supply path which consists of a current collection tab extension part to which the current collection tab which comprises the said main electricity supply path was extended shall contact the said current-collected current collection tab part with elasticity. be able to.
　また、前記バイパス通電路の先端が、前記封口体底面方向を向いている構成とすることができる。 Also, the tip of the bypass energizing path can be configured to face the bottom surface direction of the sealing body.
　また、前記バイパス通電路が、バイパス通電路の先端以外の部位で、前記主通電路と接触している構成とすることができる。 Further, the bypass energization path may be in contact with the main energization path at a portion other than the tip of the bypass energization path.
　また、前記バイパス通電路が、前記集電タブ延長部を渦巻き状に巻回してなる渦巻構造体で構成されているものとすることができる。 Further, the bypass energization path may be formed of a spiral structure formed by spirally winding the current collecting tab extension.
　ここでバイパス通電路が、弾性を持って前記蛇行した集電タブ部と接触しているものは、集電タブの蛇行部分と封口体底面または底面側の集電タブ部分とが安定して接触連結される。この場合に、バイパス通電路の先端が電極体端面の対向側である封口体底面方向に向いていると、バイパス通電路の先端が電極体に突き刺さる事故を予防することができる。 Here, when the bypass energizing path is in contact with the meandering current collecting tab portion with elasticity, the meandering portion of the current collecting tab and the current collecting tab portion on the bottom surface or bottom side of the sealing body are in stable contact. Connected. In this case, if the tip of the bypass energization path is directed toward the sealing body bottom surface, which is the opposite side of the electrode body end face, an accident in which the tip of the bypass energization path pierces the electrode body can be prevented.
　また、金属製集電タブを渦巻き状に巻回したものは、外側に広がろうとする弾性力を有するので、渦巻き状に巻回した渦巻構造体でバイパス通電路を構成すると、集電タブの蛇行部分と封口体底面または底面側の集電タブ部分とがより確実かつ安定して接触連結される。このような渦巻構造体が、延長部に形成された構造であると、集電タブ本体部を封口体底部に溶接等した後に、当該封口体を電池缶開口に嵌合されることにより、簡単にバイパス通電路を形成させることができる。渦巻構造体が電池内で拡張し、自らでバイパス通電路を形成するからである。 In addition, since the metal current collecting tab wound in a spiral shape has an elastic force to spread outward, if the bypass energizing path is constituted by the spiral structure wound in a spiral shape, The serpentine portion and the bottom surface of the sealing body or the current collecting tab portion on the bottom surface side are more reliably and stably contact-connected. When such a spiral structure is a structure formed in the extension part, after the current collector tab main body part is welded to the bottom part of the sealing body, the sealing body is easily fitted into the battery can opening. Can form a bypass energization path. This is because the spiral structure expands in the battery and forms a bypass current path by itself.
　さらに、渦巻き状に巻回した渦巻構造体では、集電タブの先端が渦巻の中に収められているので、電池の落下などの際に振動衝撃が加わっても、集電タブ先端が電池内の他の要素に突き刺さるといった事故が起きない。なお、ここで渦巻き状とは、巻きが１周に満たないような状態も含まれ、そのような構成が可能であって、同様に効果を奏することは自明であろう。 Furthermore, in the spiral structure wound in a spiral shape, the tip of the current collector tab is housed in the spiral, so even if a vibration shock is applied when the battery is dropped, the tip of the current collector tab is in the battery. Accidents that pierce other elements do not occur. Here, the spiral shape includes a state where the winding is less than one turn, and such a configuration is possible, and it is obvious that the same effect can be obtained.
　ここまでは、延長されたバイパス通電路の先端が主通電路に固定されていない態様を説明した。しかしながら、工程が若干煩雑になることが許されれば、延長されたバイパス通電路の先端を主通電路に溶接することも可能である。この場合、バイパス通電路の先端が固定されるので、短絡の危険性が低くなる。 So far, the mode in which the tip of the extended bypass current path is not fixed to the main current path has been described. However, if the process is allowed to be slightly complicated, it is possible to weld the end of the extended bypass current path to the main current path. In this case, since the tip of the bypass energization path is fixed, the risk of a short circuit is reduced.
　以上から、上記構成であると、熱溶融切断や集電タブ先端の突き刺し事故を防止し得た信頼性の高い大電流放電対応の円筒形リチウムイオン電池を組み立て作業性がよく実現することができる。 From the above, with the above configuration, a highly reliable cylindrical lithium ion battery compatible with high current discharge that can prevent hot melt cutting and piercing accidents at the tip of the current collecting tab can be well realized. .
　本発明にかかる新規な集電タブ通電路構造は、集電タブ通電路以外の電池構造を改変することなく、従前の集電タブを用いて、通電路系に瞬間的に流れる大電流によって集電タブが発熱切断されるといった事故を防止することができる。電動工具や電気自動車などの用途においては、大トルク必要時に瞬間的に大電流が流れ、この電流によって通電経路の中間点付近が溶融切断され易いが、本発明によると、コストパフォーマンスよく、このような通電経路の溶融切断に起因するトラブルを抑制することができる。 The novel current collecting tab current path structure according to the present invention is a current collecting tab that uses a conventional current collecting tab and does not modify the battery structure other than the current collecting tab current path, and collects current by a large current that flows instantaneously in the current path system. It is possible to prevent an accident that the electric tab is cut off by heating. In applications such as electric tools and electric vehicles, a large current instantaneously flows when a large torque is required, and this current easily melts and cuts the vicinity of the midpoint of the current-carrying path. Troubles caused by melt cutting of a simple energization path can be suppressed.
図１は、実施例１の円筒形リチウムイオン電池の部分解体斜視図である。1 is a partially exploded perspective view of a cylindrical lithium ion battery of Example 1. FIG. 図２は、実施例１にかかる集電タブ通電路構造を形成する電池組立状況を説明するための断面模式図である。FIG. 2 is a schematic cross-sectional view for explaining a battery assembly state for forming the current collecting tab energizing path structure according to the first embodiment. 図３は、実施例１にかかる集電タブ通電路構造を示す断面模式図である。FIG. 3 is a schematic cross-sectional view illustrating the current collecting tab current path structure according to the first embodiment. 図４は、実施例２にかかる集電タブ通電路構造を形成する電池組立状況を説明するための断面模式図である。FIG. 4 is a schematic cross-sectional view for explaining a battery assembly state for forming the current collecting tab energizing path structure according to the second embodiment. 図５は、実施例２にかかる集電タブからなる通電路構造を示す断面模式図である。FIG. 5 is a schematic cross-sectional view illustrating a current-carrying path structure including current collecting tabs according to the second embodiment. 図６は、従来技術にかかる集電タブ通電路を説明するための断面模式図である。FIG. 6 is a schematic cross-sectional view for explaining a current collecting tab energizing path according to the prior art. 図７は、従来技術にかかる集電タブ通電路を示す断面模式図である。FIG. 7 is a schematic cross-sectional view showing a current collecting tab energization path according to the prior art.
　本発明を実施するための形態を、実施例および比較例に基づいて説明する。なお、本発明は下記実施例に限定されるものではなく、本発明の要旨を変更しない範囲において適宜変更して実施することができる。 DETAILED DESCRIPTION Embodiments for carrying out the present invention will be described based on examples and comparative examples. In addition, this invention is not limited to the following Example, In the range which does not change the summary of this invention, it can change suitably and can implement.
（実施例１）
　図１は、本発明実施例１の円筒形リチウムイオン電池にかかる断面解体斜視図である。図１に示すように、この電池は、開口を有する有底円筒形電池缶１と、円筒形電池缶１内に収容された渦巻き状電極体２と、円筒形電池缶１内に収容された電解液と、渦巻き状電極体２の上方に配置された、貫通穴を有する絶縁板７と、円筒形電池缶１の開口を封口する封口体６とからなる。 Example 1
FIG. 1 is a cross-sectional disassembled perspective view of a cylindrical lithium ion battery according to Embodiment 1 of the present invention. As shown in FIG. 1, this battery has a bottomed cylindrical battery can 1 having an opening, a spiral electrode body 2 accommodated in the cylindrical battery can 1, and a cylindrical battery can 1. It consists of an electrolytic solution, an insulating plate 7 having a through-hole disposed above the spiral electrode body 2, and a sealing body 6 that seals the opening of the cylindrical battery can 1.
　渦巻き状電極体２は、正負電極板３・４がセパレータ５を介して巻回されたものであり、正負電極板３・４は、長尺状の金属製芯体の表裏面に活物質が塗着されてなるものである。正負電極板３・４には、活物質の塗着されていない芯体露出部が形成されており、この部分に帯状の正負集電タブが例えば溶接法により接続されている。 In the spiral electrode body 2, positive and negative electrode plates 3 and 4 are wound through a separator 5, and the positive and negative electrode plates 3 and 4 have active materials on the front and back surfaces of a long metal core. It is made by painting. The positive and negative electrode plates 3 and 4 are formed with exposed core portions to which no active material is applied, and band-like positive and negative current collecting tabs are connected to this portion by, for example, a welding method.
　実施例１の電池では、渦巻き状電極体２は正極板３から導出する正極集電タブ３０が封口体６側に位置するように円筒形電池缶１内に収容されており、円筒形電池缶１の開口を封口する封口体６は、正極外部出力端子を兼ねる構造になっている。 In the battery of Example 1, the spiral electrode body 2 is accommodated in the cylindrical battery can 1 so that the positive electrode current collecting tab 30 led out from the positive electrode plate 3 is located on the sealing body 6 side. The sealing body 6 that seals the opening of 1 also serves as a positive electrode external output terminal.
　一端が正極板３に通電可能に接続された正極集電タブ３０は、絶縁板７の貫通穴を通って絶縁板７と封口体６底部とで挟まれた空間に導出され、当該空間を蛇行した状態（弛みをもった状態）で封口体６底部に通電可能に接続されている。この接続には、例えば超音波溶接法が用いられる。 The positive electrode current collecting tab 30 whose one end is connected to the positive electrode plate 3 so as to be energized is led out to a space sandwiched between the insulating plate 7 and the bottom of the sealing body 6 through the through hole of the insulating plate 7, and the space is meandered. In such a state (a state having slackness), the bottom of the sealing body 6 is connected to be energized. For this connection, for example, an ultrasonic welding method is used.
　実施例１の電池の正極集電タブ３０は、図１に示すように封口体６底部への溶接部位よりも先に延びており、溶接部位よりも先に延びる集電タブ部分は渦巻き状に巻き取られて渦巻構造体３０ｃが形成されている。渦巻構造体３０ｃは、封口体底部とこれに対向する集電タブ部分に接触することにより、もう一つの通電路であるバイパス導電路が形成されている。 As shown in FIG. 1, the positive electrode current collecting tab 30 of the battery of Example 1 extends ahead of the welded portion to the bottom of the sealing body 6, and the current collecting tab portion extending ahead of the welded portion has a spiral shape. The spiral structure 30c is formed by being wound. The spiral structure 30c is in contact with the bottom of the sealing body and the current collecting tab portion facing the sealing body, thereby forming a bypass conductive path, which is another current path.
　図１～図３に基づいて正極集電タブ３０からなる通電路構造を説明する。図１は前記説明の通りである。図２（ａ）は、封口体６が電池缶１の開口に嵌合される前であって、集電タブ本体部３０ａと集電タブ延長部３０ｂを有する正極集電タブ３０が封口体底部の溶接部位１０に溶接された状態を概念的に表した正面断面図であり、図２（ｂ）は、集電タブ延長部３０ｂが渦巻き状に巻回された状態を示す図であり、図２（ａ）に対する側面断面図である。図３は、封口体６が電池缶１の開口に嵌合され電池缶１が封口された後の通電経路を概念的に示す電池断面図である。 A current path structure composed of the positive electrode current collecting tab 30 will be described with reference to FIGS. FIG. 1 is as described above. FIG. 2 (a) shows the state before the sealing body 6 is fitted into the opening of the battery can 1, and the positive current collecting tab 30 having the current collecting tab main body 30a and the current collecting tab extension 30b is the bottom of the sealing body. FIG. 2B is a front cross-sectional view conceptually showing a state welded to the welded portion 10 of FIG. 2, and FIG. 2B is a view showing a state where the current collecting tab extension 30b is wound in a spiral shape. It is side surface sectional drawing with respect to 2 (a). FIG. 3 is a battery cross-sectional view conceptually showing an energization path after the sealing body 6 is fitted into the opening of the battery can 1 and the battery can 1 is sealed.
　ここで、本発明においては、正極板３から導出した正極集電タブ３０が部位ごとで異なる機能を有するので、その機能ごとに別の名称を与えて識別している。すなわち、正極板からの導出開始端から封口体６底部の接続部位までの間を集電タブ本体部（３０ａ）と称し、封口体６底部の溶接部位（または接続部位）から先を集電タブ延長部（３０ｂ）と称する。 Here, in the present invention, since the positive electrode current collecting tab 30 derived from the positive electrode plate 3 has a different function for each part, the function is identified by giving a different name. That is, the portion from the lead-out start end from the positive electrode plate to the connecting portion at the bottom of the sealing body 6 is referred to as a current collecting tab main body (30a), and the current collecting tab from the welding portion (or connecting portion) at the bottom of the sealing body 6 is referred to. This is called the extension (30b).
　また、集電タブ延長部３０ｂの全部または一部が渦巻き状に巻回された部分を渦巻構造体３０ｃと称し、集電タブ延長部３０ｂを屈曲させた部分を屈曲構造体３０ｄ（実施例２参照）と称する。 Further, a part where all or a part of the current collecting tab extension 30b is spirally wound is referred to as a spiral structure 30c, and a part where the current collecting tab extension 30b is bent is a bent structure 30d (Example 2). Reference).
　上記集電タブ本体部３０ａは正極板３から外部出力端子を兼ねる封口体に電気を導く主導電路となる部分である。正極板３から封口体６底部に至る主導電路は、絶縁板７と封口体６底部との間の隙間内を蛇行させることにより集電タブに緩みを持たせるようにしてある。正極板３と封口体６底部との間が最短距離で結ばれていると、電池落下などにより電極体２が上下動したときに、集電タブに大きな張力が加わって切断されるからである。 The current collecting tab main body 30a is a portion that becomes a main conductive path for conducting electricity from the positive electrode plate 3 to a sealing body that also serves as an external output terminal. The main conductive path from the positive electrode plate 3 to the bottom of the sealing body 6 meanders the gap between the insulating plate 7 and the bottom of the sealing body 6 so that the current collecting tab is loosened. This is because, when the positive electrode plate 3 and the bottom of the sealing body 6 are connected at the shortest distance, when the electrode body 2 moves up and down due to a battery drop or the like, a large tension is applied to the current collecting tab and it is cut. .
　実施例１においては、上記集電タブ延長部３０ｂが渦巻き状に巻回されて渦巻構造体３０ｃが形成されているが、渦巻構造体３０ｃには、渦巻きを解除しようとする力（外側に拡張しようとする力）が常に働いている。よって、図２（ｂ）に示す渦巻きを保持させた状態で、封口体６底部を電池缶１開口に嵌合させると、電池内で渦巻きが拡張して、集電タブ本体部３０ａの一部と封口体６底部の両者に接触する（図３参照）。これにより第２の導電経路であるバイパス導電路が形成される。 In the first embodiment, the current collecting tab extension 30b is spirally wound to form a spiral structure 30c. However, the spiral structure 30c has a force (expanded outward) to release the spiral. The power to try) is always working. Accordingly, when the bottom of the sealing body 6 is fitted into the opening of the battery can 1 with the spiral shown in FIG. 2B held, the spiral expands within the battery, and a part of the current collecting tab main body 30a. And the bottom of the sealing body 6 (see FIG. 3). As a result, a bypass conductive path which is the second conductive path is formed.
　実施例１の円筒形リチウムイオン電池の製造方法について更に説明する。
〈正極板の作製〉
正極活物質としてのコバルト酸リチウム９５質量部と糊材５質量部の混合物にＮ－メチル－２－ピロリドンを混合して正極活物質スラリーを調製した。このスラリーを、幅５５ｍｍ、長さ８８０ｍｍ、厚み０．０２ｍｍのアルミニウム箔からなる正極芯体の両面に、ドクターブレード法により塗布した。この際、正極芯体の一方端側に活物質を塗布しない領域（芯体露出部）が形成されるようにした。 The manufacturing method of the cylindrical lithium ion battery of Example 1 will be further described.
<Preparation of positive electrode plate>
A positive electrode active material slurry was prepared by mixing N-methyl-2-pyrrolidone with a mixture of 95 parts by mass of lithium cobaltate as a positive electrode active material and 5 parts by mass of a paste material. This slurry was applied to both surfaces of a positive electrode core made of an aluminum foil having a width of 55 mm, a length of 880 mm, and a thickness of 0.02 mm by a doctor blade method. At this time, a region where the active material is not applied (core exposed portion) is formed on one end side of the positive electrode core.
　この後、塗布層を乾燥し圧縮ローラーで圧縮した後、上記芯体露出部に幅３ｍｍ、長さ７６ｍｍ、厚み０．１５ｍｍのアルミニウム製正極集電タブを超音波溶接した。このようにして、活物質層の厚みが０.１０ｍｍの集電タブ付き正極板３を作製した。 Thereafter, the coated layer was dried and compressed with a compression roller, and then an aluminum positive electrode current collector tab having a width of 3 mm, a length of 76 mm, and a thickness of 0.15 mm was ultrasonically welded to the core exposed portion. Thus, a positive electrode plate 3 with a current collecting tab having an active material layer thickness of 0.10 mm was produced.
〈負極板の作製〉
　負極活物質としての天然黒鉛粉末９８質量部と糊材２質量部の混合物に水を混合して負極活物質スラリーを調製した。このスラリーを、幅５７ｍｍ、長さ９６０ｍｍ、厚み　０．０１ｍｍの銅箔からなる負極芯体の両面に、ドクターブレード法により塗布した。この際、負極芯体の両端に活物質を塗布しない領域（芯体露出部）が形成されるようにした。 <Preparation of negative electrode plate>
Water was mixed with a mixture of 98 parts by mass of natural graphite powder as a negative electrode active material and 2 parts by mass of a paste material to prepare a negative electrode active material slurry. This slurry was applied to both surfaces of a negative electrode core made of a copper foil having a width of 57 mm, a length of 960 mm, and a thickness of 0.01 mm by a doctor blade method. At this time, regions (core exposed portions) where no active material was applied were formed at both ends of the negative electrode core.
　この後、塗布層を乾燥し圧縮ローラーで圧縮した後、上記芯体露出部に幅３ｍｍ、長さ５０ｍｍ、厚み０．１０ｍｍのニッケル製負極集電タブを超音波溶接した。このようにして、活物質層の厚みが０.０９ｍｍの集電タブ付き負極板４を作製した。 Thereafter, the coated layer was dried and compressed with a compression roller, and then a nickel negative electrode current collecting tab having a width of 3 mm, a length of 50 mm, and a thickness of 0.10 mm was ultrasonically welded to the core exposed portion. Thus, the negative electrode plate 4 with a current collection tab whose thickness of an active material layer is 0.09 mm was produced.
〈渦巻き電極体の作製〉
　上記集電タブ付き正極板と集電タブ付き負極板との間に、幅５９ｍｍ、長さ２０００ｍｍ、厚み０．０２２ｍｍのセパレータを介在させ、両電極板を渦巻き状に巻回して渦巻き電極体２を作製した。 <Production of spiral electrode body>
A separator having a width of 59 mm, a length of 2000 mm, and a thickness of 0.022 mm is interposed between the positive electrode plate with current collecting tab and the negative electrode plate with current collecting tab, and both electrode plates are spirally wound to form a spiral electrode body 2. Was made.
〈電池の組立て〉
　渦巻き電極体２の負極集電タブ側を缶底側に向けて円筒形電池缶１内に収容し、負極集電タブ４０を電池缶１の缶底に電気抵抗溶接した。絶縁板７を正極集電タブ３０を貫通穴に通して渦巻き電極体２の上部に置いた後、封口体６を溶接した。 <Battery assembly>
The spiral electrode body 2 was accommodated in the cylindrical battery can 1 with the negative electrode current collection tab side facing the bottom of the can, and the negative electrode current collection tab 40 was electrically resistance welded to the bottom of the battery can 1. After the insulating plate 7 was placed on the upper part of the spiral electrode body 2 through the positive electrode current collecting tab 30 through the through hole, the sealing body 6 was welded.
〈渦巻構造体の作製〉
　図２（ｂ）に示すように、集電タブ延長部３０ｂを電池缶底部から離れる方向に巻回して渦巻構造体３０ｃを形成した。 <Production of spiral structure>
As shown in FIG. 2B, the current collecting tab extension 30b was wound in a direction away from the bottom of the battery can to form a spiral structure 30c.
〈電池の封口〉
　円筒形電池缶１に電解液を注入し、封口体６を樹脂製ガスケットを介して円筒形電池缶１の開口に嵌合させ、開口周縁をかしめる方法で上記開口を封口した。これにより実施例１にかかる円筒形リチウムイオン電池を完成させた（図１，３参照）。この電池の外形は直径１８ｍｍ、高さ６５ｍｍであり、電池容量は１３００ｍＡｈであった。 <Battery seal>
The electrolytic solution was injected into the cylindrical battery can 1, the sealing body 6 was fitted into the opening of the cylindrical battery can 1 through a resin gasket, and the opening was sealed by a method of caulking the periphery of the opening. Thereby, the cylindrical lithium ion battery according to Example 1 was completed (see FIGS. 1 and 3). The battery had an outer diameter of 18 mm, a height of 65 mm, and a battery capacity of 1300 mAh.
（実施例２）
　実施例２は、集電タブ延長部（３０ｂ）を有する集電タブを用いている点において上記実施例１と同様であるが、実施例２では、図４（ａ）、（ｂ）に示すように、集電タブ延長部が屈曲構造体（３０ｄ）になっている点において、実施例１と異なる。 (Example 2)
Example 2 is the same as Example 1 above in that a current collecting tab having a current collecting tab extension (30b) is used, but Example 2 is shown in FIGS. 4 (a) and 4 (b). Thus, it differs from Example 1 in the point whose current collection tab extension part is a bending structure (30d).
　より詳しくは、実施例２の延長部は、渦巻き状ではなく、封口体６を電池缶開口に嵌合したときに延長部（３０ｂ）が集電タブ本体部３０ａに接触する形状に曲げられた屈曲構造体になっている（図４、５参照）。その他の事項については、実施例１の場合と同様にして、バイパス通電路を有する実施例２にかかる円筒形リチウムイオン電池を作製した。 More specifically, the extension part of Example 2 was not spiral, but was bent into a shape in which the extension part (30b) was in contact with the current collector tab body part 30a when the sealing body 6 was fitted into the battery can opening. It is a bent structure (see FIGS. 4 and 5). About the other matter, it carried out similarly to the case of Example 1, and produced the cylindrical lithium ion battery concerning Example 2 which has a bypass electricity supply path.
　なお、集電タブ延長部３０ｂはバイパス通電路を形成するための部分であり、実施例１では集電タブ延長部３０ｂが渦巻弾性構造になっており、実施例２では屈曲弾性構造になっているが、バイパス通電路を形成することができる構造であればこれらの構造に限られるものではない。 The current collecting tab extension 30b is a part for forming a bypass energization path. In the first embodiment, the current collecting tab extension 30b has a spiral elastic structure, and in the second embodiment has a bending elastic structure. However, the structure is not limited to these structures as long as the bypass current path can be formed.
（比較例１）
　幅３ｍｍ、長さ６６ｍｍ、厚み０．１５ｍｍのアルミニウム製箔を正極集電タブとして用い、集電タブ延長部を形成しなかったこと以外は、上記実施例１の場合と同様にして円筒形リチウムイオン電池を作製した。 (Comparative Example 1)
Cylindrical lithium in the same manner as in Example 1 except that an aluminum foil having a width of 3 mm, a length of 66 mm, and a thickness of 0.15 mm was used as the positive electrode current collector tab and the current collector tab extension was not formed. An ion battery was produced.
　なお、比較例１で用いた正極集電タブは長さが短い点を除き、実施例１，２で用いた集電タブと同様であり、比較例１の円筒形リチウムイオン電池は、正極集電系がバイパス通電路を有しない点で、実施例１および実施例２と相違するのみである。 The positive electrode current collecting tab used in Comparative Example 1 is the same as the current collecting tab used in Examples 1 and 2 except that the length is short. The cylindrical lithium ion battery of Comparative Example 1 is a positive electrode current collecting tab. The only difference from the first and second embodiments is that the electric system does not have a bypass current path.
〈熱溶断試験〉
　実施例１と比較例１の電池について、熱溶断試験を行った。熱溶断試験は、充電状態の電池を直流ロードに繋ぎ、１１０Ａ、１２０Ａ、１３０Ａ、１４０Ａ、または１５０Ａの電流値を３秒間流して、正極集電タブが熱溶断するかどうかを調べるというものである。熱溶断試験結果を表1に示した。 <Thermal fusing test>
The batteries of Example 1 and Comparative Example 1 were subjected to a thermal fusing test. In the thermal fusing test, a battery in a charged state is connected to a DC load, and a current value of 110A, 120A, 130A, 140A, or 150A is passed for 3 seconds to check whether the positive electrode current collecting tab is thermally fused. . The thermal fusing test results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１から明らかなように、実施例１においては、１５０Ａにおいて初めて熱溶断が確認された。これに対して、比較例１においては、電流値１３０Ａで熱溶断が確認された。この結果から、材質およびタブ幅とタブ厚みとが同一の集電タブを用いた場合であっても、バイパス通電路を形成することにより、熱溶断の発生する電流値を大幅に高めることができることが判る。なお、実施例２においても実施例１と同様な結果が得られている。 As apparent from Table 1, in Example 1, thermal fusing was confirmed for the first time at 150A. In contrast, in Comparative Example 1, thermal fusing was confirmed at a current value of 130A. From this result, even when a current collecting tab with the same material, tab width and tab thickness is used, the current value at which thermal fusing occurs can be significantly increased by forming a bypass energizing path. I understand. In Example 2, the same result as in Example 1 was obtained.
　これらの結果から、バイパス通電路を設ける本発明によると、熱溶断に強いリチウムイオン電池が得られることが実証できた。 From these results, it was proved that according to the present invention in which the bypass current path is provided, a lithium ion battery resistant to thermal fusing can be obtained.
（付加事項）上記実施例１，２では、一本の帯状集電タブを用いて主通電路とバイパス通電路を形成したが、主通電路を形成する集電タブとバイパス通電路を形成する集電タブとを別々にしてもよい。別個の集電タブでバイパス通電路を形成する場合には、当該集電タブについてもその一方端側を封口体底部に溶接等の方法で接続する必要がある。 (Additional items) In the first and second embodiments, the main energization path and the bypass energization path are formed using a single strip-shaped current collection tab. However, the current collection tab and the bypass energization path that form the main energization path are formed. The current collecting tab may be separated. When forming a bypass energization path with a separate current collecting tab, it is necessary to connect one end side of the current collecting tab to the bottom of the sealing body by a method such as welding.
　集電タブの寸法は、予め規定されるものでない。電池容量や電池の大きさにあわせて適当に設定すればよいが、例えば外形直径１８ｍｍ、高さ６５ｍｍの円筒形電池に収容する巻回電極体については、当該電極体から導出する集電タブの幅を２～５ｍｍ、厚さを０．１～０．２ｍｍとする。 The dimensions of the current collector tab are not specified in advance. It may be set appropriately according to the battery capacity and the size of the battery. For example, for a wound electrode body housed in a cylindrical battery having an outer diameter of 18 mm and a height of 65 mm, The width is 2 to 5 mm and the thickness is 0.1 to 0.2 mm.
　集電タブの材質としては、正極集電タブについては好ましくはアルミニウムまたはアルミニウムを主体とするアルミニウム合金を用い、負極集電タブについては好ましくは銅または銅合金、ニッケル又はニッケル合金、またはこれらを貼り合わせたクラッド材を用いる。 As the material of the current collecting tab, aluminum or an aluminum alloy mainly composed of aluminum is preferably used for the positive current collecting tab, and preferably copper or copper alloy, nickel or nickel alloy, or these are pasted on the negative current collecting tab. Combined clad material is used.
　また、電極体から露出している集電タブの長さは、主通電路とバイパス通電路との合計で、２０～３０ｍｍとするのが好ましい。ただし、この長さについても、電池の大きさに合わせて適宜設定すればよい。 Also, the length of the current collecting tab exposed from the electrode body is preferably 20 to 30 mm in total of the main energizing path and the bypass energizing path. However, this length may be appropriately set according to the size of the battery.
　本発明によれば、新たな部材を用意することなく、集電タブ通電路以外の電池構造を改変することなく、従前の集電タブを用いて大電流放電が可能な円筒形リチウムイオン電池を実現することができる。このような本発明電池は、電動工具や電気自動車など大電流を必要とする用途における利用可能性が大きい。 According to the present invention, there is provided a cylindrical lithium ion battery capable of discharging a large current using a conventional current collecting tab without preparing a new member and without modifying the battery structure other than the current collecting tab current path. Can be realized. Such a battery of the present invention has great applicability in applications that require a large current, such as electric tools and electric vehicles.
１　　　　　円筒形電池缶
２　　　　　電極体
３　　　　　正極板
４　　　　　負極板
５　　　　　セパレータ
６　　　　　封口体
７　　　　　絶縁板
１０　　　　溶接部位
３０　　　　正極集電タブ
３０ａ　　　集電タブ本体部
３０ｂ　　　集電タブ延長部
３０ｃ　　　渦巻構造体
３０ｄ　　　屈曲構造体
４０　　　　負極集電タブ DESCRIPTION OF SYMBOLS 1 Cylindrical battery can 2 Electrode body 3 Positive electrode plate 4 Negative electrode plate 5 Separator 6 Sealing body 7 Insulation plate 10 Welded part 30 Positive electrode current collection tab 30a Current collection tab main-body part 30b Current collection tab extension part 30c Spiral structure 30d Bending structure 40 Negative current collector tab

Claims (9)

  1. 　一方電極板とこれとは極性の異なる他方電極板とがセパレータを介して巻回されてなる電極体が、巻回軸を上下方向に向けて、開口を有する円筒形電池缶内に収容され、
    　貫通穴を有する絶縁板が前記電極体の前記開口側に配置され、
    　前記開口が一方電極板の外部出力端子を兼ねる封口体で封口された構造の円筒形リチウムイオン電池において、
    　前記一方電極板と外部出力端子を兼ねる前記封口体との間の通電路が、主通電路とバイパス通電路とからなり、
    　前記主通電路は、前記一方電極板に接続された集電タブが前記絶縁板の貫通穴を通って前記絶縁板上面と前記封口体底面との空隙内に導かれ、当該空隙内を蛇行した状態で前記封口体底面の接続部位に接続されてなる通電路であり、
    　前記バイパス通電路は、前記蛇行した集電タブ部分と前記封口体底面との双方に接触する集電タブからなる通電路である、
    　ことを特徴とする円筒形リチウムイオン電池。     One electrode plate and the other electrode plate of which polarity is different from that of the electrode body, which is wound through a separator, is housed in a cylindrical battery can having an opening with the winding axis facing in the vertical direction,
    An insulating plate having a through hole is disposed on the opening side of the electrode body,
    In the cylindrical lithium ion battery having a structure in which the opening is sealed with a sealing body that also serves as an external output terminal of one electrode plate,
    The energization path between the one electrode plate and the sealing body that also serves as an external output terminal consists of a main energization path and a bypass energization path,
    In the main energization path, a current collecting tab connected to the one electrode plate is guided through the through hole of the insulating plate into a gap between the upper surface of the insulating plate and the bottom surface of the sealing body, and meanders in the gap. It is an energization path that is connected to the connection site on the bottom surface of the sealing body in a state,
    The bypass energization path is an energization path composed of a current collecting tab that contacts both the meandering current collecting tab portion and the bottom surface of the sealing body.
    A cylindrical lithium ion battery characterized by the above.
  2. 　請求項１に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路が、前記主通電路を構成する集電タブが延長された集電タブ延長部からなる、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 1,
    The bypass energization path is composed of a current collection tab extension portion in which a current collection tab constituting the main energization path is extended.
    A cylindrical lithium ion battery characterized by the above.
  3. 　請求項２に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路が、弾性を持って前記蛇行した集電タブ部と接触している、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 2,
    The bypass energization path is in contact with the meandering current collecting tab portion with elasticity;
    A cylindrical lithium ion battery characterized by the above.
  4. 　請求項３に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路は、バイパス通電路の先端以外の部位で、前記主通電路と接触している、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 3,
    The bypass energization path is in contact with the main energization path at a portion other than the tip of the bypass energization path.
    A cylindrical lithium ion battery characterized by the above.
  5. 　請求項４に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路の先端は、前記封口体底面方向を向いている、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 4,
    The tip of the bypass energization path faces the sealing body bottom surface direction,
    A cylindrical lithium ion battery characterized by the above.
  6. 　請求項４に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路は、前記集電タブ延長部が渦巻き状に巻回されてなる渦巻構造体で構成されている、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 4,
    The bypass energization path is constituted by a spiral structure formed by spirally winding the current collecting tab extension.
    A cylindrical lithium ion battery characterized by the above.
  7. 　請求項１に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路が、弾性を持って前記蛇行した集電タブ部と接触している、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 1,
    The bypass energization path is in contact with the meandering current collecting tab portion with elasticity;
    A cylindrical lithium ion battery characterized by the above.
  8. 　請求項７に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路は、バイパス通電路の先端以外の部位で、前記主通電路と接触している、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 7,
    The bypass energization path is in contact with the main energization path at a portion other than the tip of the bypass energization path.
    A cylindrical lithium ion battery characterized by the above.
  9. 　請求項８に記載の円筒形リチウムイオン電池において、
    　前記バイパス通電路の先端は、前記封口体底面方向を向いている、
    　ことを特徴とする円筒形リチウムイオン電池。     The cylindrical lithium ion battery according to claim 8,
    The tip of the bypass energization path faces the sealing body bottom surface direction,
    A cylindrical lithium ion battery characterized by the above.
PCT/JP2011/067077 2010-07-29 2011-07-27 Cylindrical lithium-ion battery WO2012014929A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102945980A (en) * 2012-10-17 2013-02-27 蔡明军 Manufacturing process for cylinder battery
WO2023223584A1 (en) * 2022-05-16 2023-11-23 パナソニックＩｐマネジメント株式会社 Battery and method for manufacturing same

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JPH0572048U (en) * 1992-02-28 1993-09-28 三洋電機株式会社 Battery anode current collector
JPH10233228A (en) * 1997-02-17 1998-09-02 Fuji Photo Film Co Ltd Cylindrical battery and its assembling method
JPH1186868A (en) * 1997-09-05 1999-03-30 Sony Corp Secondary battery and manufacture thereof
JPH11102689A (en) * 1997-09-26 1999-04-13 Sanyo Electric Co Ltd Sealed alkaline storage battery and its manufacture
JP2001023608A (en) * 1999-07-12 2001-01-26 Matsushita Electric Ind Co Ltd Secondary battery

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0572048U (en) * 1992-02-28 1993-09-28 三洋電機株式会社 Battery anode current collector
JPH10233228A (en) * 1997-02-17 1998-09-02 Fuji Photo Film Co Ltd Cylindrical battery and its assembling method
JPH1186868A (en) * 1997-09-05 1999-03-30 Sony Corp Secondary battery and manufacture thereof
JPH11102689A (en) * 1997-09-26 1999-04-13 Sanyo Electric Co Ltd Sealed alkaline storage battery and its manufacture
JP2001023608A (en) * 1999-07-12 2001-01-26 Matsushita Electric Ind Co Ltd Secondary battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102945980A (en) * 2012-10-17 2013-02-27 蔡明军 Manufacturing process for cylinder battery
WO2023223584A1 (en) * 2022-05-16 2023-11-23 パナソニックＩｐマネジメント株式会社 Battery and method for manufacturing same

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