WO2012090600A1 - Accumulateur rectangulaire et son procédé de fabrication - Google Patents

Accumulateur rectangulaire et son procédé de fabrication Download PDF

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Publication number
WO2012090600A1
WO2012090600A1 PCT/JP2011/076037 JP2011076037W WO2012090600A1 WO 2012090600 A1 WO2012090600 A1 WO 2012090600A1 JP 2011076037 W JP2011076037 W JP 2011076037W WO 2012090600 A1 WO2012090600 A1 WO 2012090600A1
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Prior art keywords
exposed portion
divided
positive electrode
conductive
core
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PCT/JP2011/076037
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English (en)
Japanese (ja)
Inventor
服部　高幸
毅典 木村
山内　康弘
能間　俊之
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三洋電機株式会社
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Publication of WO2012090600A1 publication Critical patent/WO2012090600A1/fr

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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
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 prismatic secondary battery having a stacked or wound positive electrode core exposed portion and negative electrode core exposed portion and a method for manufacturing the same. Specifically, in the present invention, at least one side of the positive electrode core exposed portion and the negative electrode core exposed portion is divided into two, and a conductive member is disposed between the core exposed portion and the current collecting member, and the core exposed. There is little stress on the resistance weld due to the expansion and contraction of the electrode body due to charge and discharge, and the resistance of the weld is reduced, and the quality of the welded part is achieved.
  • the present invention relates to a prismatic secondary battery in which is stabilized.
  • EV electric vehicles
  • HEV hybrid electric vehicles
  • a lightweight and high capacity battery can be obtained.
  • Non-aqueous electrolyte secondary batteries such as secondary batteries are increasingly used.
  • an electrode body of a square secondary battery such as a lithium ion secondary battery for EV and HEV has a configuration in which a positive electrode plate and a negative electrode plate are stacked or wound via a separator.
  • the core body exposed portions of the positive electrode plate and the negative electrode plate are arranged so as to be located on different sides, and the core body exposed portions of the positive electrode plate are laminated and welded to the positive electrode current collector member.
  • the core exposed portion of the plate is also laminated and welded to the negative electrode current collector.
  • the number of stacked positive electrode core exposed portions and negative electrode core exposed portions is very large when the capacity of a prismatic secondary battery such as a lithium ion secondary battery for EV and HEV is large. Therefore, in the electrode body of a prismatic secondary battery such as a lithium ion secondary battery for EV and HEV, further improvement is desired with respect to the exposed portion of the core body of the electrode electrode plate and the current collecting member.
  • Patent Document 1 in the electrode body in which the positive electrode plate and the negative electrode plate are wound in a flat shape with a separator interposed therebetween, the lamination width of the core exposed portion of each electrode protruding from the separator is reduced.
  • an invention of an electricity storage element in which the core exposed portion of each electrode is divided into two portions and welded to a current collecting member is disclosed.
  • FIGS. 12A is a cross-sectional view of an electric double layer capacitor as a power storage element disclosed in Patent Document 1 below
  • FIG. 12B is a cross-sectional view taken along line XIIB-XIIB in FIG. 12A
  • FIG. FIG. 5 is a cross-sectional view taken along line XIIC-XIIC.
  • 13 is a view showing a welding process between the electrode core exposed portion and the current collecting member in FIG.
  • the storage element 50 includes a wound electrode body 51 in which a positive electrode plate and a negative electrode plate are laminated via a separator (both not shown) and wound in a flat shape.
  • the wound electrode body 51 is disposed in a rectangular aluminum outer can 52.
  • each of the positive electrode current collecting member 53a and the negative electrode current collecting member 53b of the electric storage element 50 is formed with U-shaped wing parts 54a to 54b at one end, respectively, and the core of the positive electrode plate.
  • the exposed portion 55a is connected to the core exposed portion 55b of the negative electrode plate, and the other end is connected to the positive terminal 56a or the negative terminal 56b.
  • the core body exposed portion 55a of the positive electrode plate is bundled and divided into two parts, which are welded to two locations on the outer surface side of one U-shaped wing portion 54a, respectively.
  • the part 55b is also divided into two parts and welded to two locations on the outer surface side of the other U-shaped wing part 54b.
  • one of the core exposed portions 55a of the positive electrode plate divided into two is arranged on the outer surface of the U-shaped wing portion 54a. Then, the horn 57 of an ultrasonic welding device (not shown) is brought into contact with the outer surface of the core exposed portion 55a, and the anvil 58 is disposed on the inner surface side of the U-shaped wing portion 54a, so that ultrasonic welding is performed. Has been done. In addition, ultrasonic welding is performed by the same method with respect to the other of the core exposed portions 55a of the two divided positive electrode plates, and the same applies to the negative electrode plate side.
  • JP 2003-249423 A Japanese Utility Model Publication No.58-113268 Japanese Unexamined Patent Publication No. 2000-40501
  • the said patent document 1 describes that it is especially preferable to use an ultrasonic welding process for the process of connecting an electrode electrode plate
  • the winding number in an Example is 16 times (it is 8 in one side divided into 2 parts).
  • the lamination thickness is 320 ⁇ m.
  • the number of stacked positive electrode core exposed portions and negative electrode core exposed portions is larger than that of the invention disclosed in Patent Document 1. And the stacking thickness is much thicker.
  • ultrasonic waves are used as a welding method between the stacked positive electrode core exposed portion and the negative electrode core exposed portion and the current collecting member.
  • a large pressure is applied to bring the stacked positive electrode core exposed portion and negative electrode core exposed portion into close contact with the current collecting member, and ultrasonic vibration is stacked. Large energy is required to reach the other end side of the exposed positive electrode core exposed portion and negative electrode core exposed portion.
  • Patent Document 2 As shown in FIG. 14, electrode core groups 64 a and 64 b in which the core body 64 of the electrode body 63 is divided into two parts and focused on both sides of the base portion 62 of the current collecting member 61.
  • the electrode plate core assembly apparatus 60 is shown in which a series spot welding is performed together with a pair of contact plates 65a and 65b disposed outside the electrode core groups 64a and 64b.
  • Patent Document 3 as shown in FIGS. 15A and 15B, the positive electrode plate and the negative electrode plate are respectively opposite to the positive electrode core exposed portion 71 and the negative electrode core exposed portion 72 through the separator. As shown in FIG.
  • the flat electrode member 73 is provided in a flat shape, and for example, the edge portion fitted in the wound central space 71a of the positive electrode core exposed portion 71 is curved.
  • a terminal of the positive electrode terminal 74 is used by using a positive electrode terminal 74 including a rectangular connection portion 74a, a terminal portion 74b protruding in a flat shaft length direction orthogonal to the winding axis direction, and a short connection portion 74c for connecting the two. After fitting the portion 74b in the central space 71a wound around the positive electrode core exposed portion 71 (see FIG. 15A), electrical connection is made by series spot welding from both sides of the positive electrode core exposed portion 71. Flat wound electrode 70 is shown.
  • the number of stacked positive electrode core exposed portions and negative electrode core exposed portions is very large, and the positive electrode core and positive electrode Aluminum or an aluminum alloy is used as the current collecting member, and copper or a copper alloy is used as the negative electrode core and the negative electrode current collecting member. Since these aluminum, aluminum alloy, copper or copper alloy are materials having low electrical resistance and good thermal conductivity, the space between the positive electrode core exposed portion and the positive electrode terminal and the negative electrode core exposed portion and the negative electrode terminal A large amount of welding energy is required to reduce the internal resistance of the welded portion by reliably resistance welding to increase the welding strength.
  • a resistance is provided at a plurality of locations between the current collecting member and the core exposed portion in order to reduce the internal resistance. Welding is preferable, but when resistance welding is performed one by one, a current flows through the previously resistance-welded part and the reactive current increases, so a large amount of welding energy that accounts for the reactive current is expected. Is required. In order to suppress the reactive current at the time of resistance welding, it can be achieved by resistance welding at a plurality of locations at the same time. However, even in this case, a large amount of welding energy is required. Furthermore, when the resistance welding structure as described in FIGS.
  • the core-divided portion divided into two parts is resistance-welded to both surfaces of one plate-like current collecting member.
  • the electrode body repeatedly expands and contracts due to charging and discharging, and therefore the core body exposed portion moves in synchronization therewith.
  • stress is applied to the resistance welded portion between the core exposed portion and the current collecting member, and the resistance welded portion may be peeled off.
  • the present invention has been made to solve the above-described problems of the prior art, and the core exposed portion on at least one side of the stacked or wound positive electrode core exposed portion and negative electrode core exposed portion is
  • the conductive member is arranged in between and resistance welding is performed between the core exposed portion and the current collecting member and between the core exposed portion and the conductive member. It is an object of the present invention to provide a prismatic secondary battery that is difficult to be subjected to stress due to expansion and contraction of the electrode body, and that can realize low resistance and quality stabilization of a welded portion, and a method of manufacturing the same.
  • a prismatic secondary battery includes an electrode body having a positive electrode core exposed portion and a negative electrode core exposed portion that are stacked or wound, and an electrical connection to the positive electrode core exposed portion.
  • the positive electrode core body of the electrode body in a rectangular secondary battery comprising: a positive electrode current collector member, a negative electrode current collector member electrically connected to the negative electrode core exposed portion, and a rectangular outer casing At least one of the exposed portion and the negative electrode core exposed portion is divided into two so that the conductive first member and the second member are arranged linearly in the stacking direction of the stacked core exposed portions.
  • one of the end surfaces of the first member and the second member is located on the inner surface side of the two-divided core body exposed portion, and the other is arranged so as to face each other without being coupled,
  • On the outermost both sides of the core exposed part on the side divided in two A pair of current collecting members are arranged, and between one of the pair of current collecting members, one of the two divided core exposed parts and the first member, and the other of the pair of current collecting members And the other of the two divided core body exposed portions and the second member are respectively resistance welded.
  • the first member and the second member are directly coupled to each other even if the core exposed portion divided into two parts moves due to the expansion / contraction of the electrode body associated with charge / discharge. Therefore, it moves in synchronization with the movement of the two-divided core body exposed portion, and stress is hardly applied to the resistance welded portion between the two-divided core body exposed portion and the first member and the second member. Therefore, according to the prismatic secondary battery of the present invention, each of the resistance welded portions between the current collector, the core exposed portion divided into two, the first member, and the second member even when charging and discharging are repeated. It becomes possible to manufacture a high-quality prismatic secondary battery with little deterioration in quality.
  • the conductive first member and the second member those having a shape that is difficult to deform such as a columnar shape, a prismatic shape, an elliptical columnar shape, and the like can be adopted.
  • the same material as the positive electrode core or negative electrode core such as aluminum or aluminum alloy, or a material made of a high melting point metal such as tungsten or molybdenum that promotes heat generation can be used.
  • the “current collecting member” in the present invention is not only directly connected to the electrode terminal, but also has a conductive member interposed between the electrode terminal and directly connected to the electrode terminal. It is used in the meaning including “current collecting receiving member”.
  • the prismatic secondary battery of the present invention it is preferable that a plurality of sets of the conductive first member and the second member are provided.
  • the core exposed portion on the side divided into two is resisted at a plurality of locations between the first member, the second member, and the current collecting member. It will be welded. Therefore, according to the prismatic secondary battery of the present invention, it is possible to obtain a prismatic secondary battery that not only has little deterioration in the quality of the resistance welded part but also has a small internal resistance and can be charged / discharged with a large current.
  • the opposing surfaces of the conductive first member and the second member are separated from each other.
  • the opposing surfaces of the first member and the second member in each set are separated from each other.
  • the conductive first member and the second member may each have a groove formed on the outer periphery.
  • the core exposed portion which is divided into two in a stable state by using the holding member as the conductive first member and the second member when manufacturing the prismatic secondary battery of the present invention. Therefore, it is possible to obtain a rectangular secondary battery in which the quality of the resistance welded portion is stabilized.
  • the conductive first member and the second member are divided into two parts in a state in which the conductive first member and the second member are slidably disposed in holes formed in the insulating intermediate member. Further, the conductive first member and the second member may be disposed between the exposed portions of the core body, and the conductive first member and the second member are fixed to the cantilever formed on the insulating intermediate member. You may arrange
  • the first member and the second member become mutually insulating intermediate members even if the core exposed portion divided into two parts moves due to expansion / contraction of the electrode body accompanying charge / discharge.
  • the core body is moved in synchronism with the movement of the core body exposed portion divided into two parts. Stress is hardly applied to the resistance weld between the member and the second member.
  • the conductive first member and the second member can be disposed between the core exposed portions divided into two in a stable state by the insulating intermediate member when the prismatic secondary battery of the present invention is manufactured.
  • each of the resistance welded portions between the current collector, the core exposed portion divided into two, the first member, and the second member even when charging and discharging are repeated. It becomes possible to manufacture a high-quality prismatic secondary battery with little deterioration in quality.
  • the insulating intermediate member of the present invention for example, a resin material such as polypropylene, polyethylene, polyvinylidene chloride, polyacetal, polyamide, polycarbonate, polyphenylene sulfide or the like can be used.
  • the width of the insulating intermediate member may be such that the surface of the insulating intermediate member facing the core exposed portion is in contact with the core exposed portion after welding in the vicinity of the resistance welding portion.
  • a groove may be formed in the outer peripheral portion or a cavity may be formed inside in order to improve gas venting during resistance welding.
  • the prismatic secondary battery of the present invention includes an electrode body having a positive electrode core body exposed portion and a negative electrode core body exposed portion that are stacked or wound, and the positive electrode core body exposed portion electrically
  • a prismatic secondary battery comprising: a positive electrode current collecting member joined to a negative electrode current collecting member; a negative electrode current collecting member electrically joined to the negative electrode core exposed portion; and a square exterior body. At least one of the positive electrode core exposed portion and the negative electrode core exposed portion is divided into two parts, and the conductive first member and the second member are on one side of the respective surfaces of the first member and the second member.
  • a plurality of protrusions are formed on the inner surface side of the two-divided core body exposed portions, and the first member and the second member are disposed apart from each other, The plurality of protrusions are arranged on the outermost side of the divided core exposed portion.
  • the plurality of current collecting members are in contact with each other at positions corresponding to the plurality of current collecting members, the two-divided core body exposed portions, and the plurality of protrusions of the first member. Resistance welding is performed between each of the plurality of current collector members, and between the plurality of current collecting members, the two-divided core body exposed portions, and each of the plurality of protrusions of the second member.
  • the first member and the second member are separated from each other even if movement occurs in the core body exposed portion divided into two due to expansion / contraction of the electrode body accompanying charge / discharge. Therefore, it moves in synchronization with the movement of the core body exposed portion divided into two parts, and stress is hardly applied to the resistance welded portion between the core body exposed portion divided into two parts and the first member and the second member.
  • a high-quality prismatic secondary battery with little deterioration in the quality of the resistance welded portion between the core exposed portion divided into the first member and the second member can be obtained even if the above is repeated.
  • the conductive first member and the second member may be disposed in grooves formed in the insulating intermediate member so as to be slidable.
  • the conductive first member and the second member can be disposed between the core exposed portions divided into two in a stable state by the insulating intermediate member at the time of manufacture.
  • a prismatic secondary battery with a stabilized quality of the resistance weld is obtained.
  • a method for manufacturing a prismatic secondary battery according to the present invention includes a stacked or wound electrode body having a positive electrode core exposed portion and a negative electrode core exposed portion, and the positive electrode core exposed portion.
  • a method for manufacturing a rectangular secondary battery comprising: a positive electrode current collecting member electrically bonded to a negative electrode current collecting member; a negative electrode current collecting member electrically bonded to the negative electrode core exposed portion; A first conductive step between a first step of dividing at least one of the positive electrode core exposed portion and the negative electrode core exposed portion of the electrode body into two and a core exposed portion on the two divided sides; End surfaces of the first member and the second member are arranged such that the first member and the second member are linearly arranged in the stacking direction of the core exposed portions where the first member and the second member are stacked.
  • the first member and the second member at the place where the pair of resistance welding electrodes are in contact with each other apply a pressing force to the pair of resistance welding electrodes in the third step.
  • it is short-circuited and resistance welding is performed.
  • the resistance between the short-circuited conductive first member and the second member is small because the contact area between both is large, and since the heat capacity of the first member and the second member is large, the first member and the second member Is less likely to occur than the fusion between the two-divided core exposed portion and the first member and the fusion between the two-divided core exposed portion and the second member.
  • one of the pair of current collecting members, one of the two exposed core bodies and the first member, and the other of the pair of current collecting members and the other of the two core exposed sections and the first member can be welded, and the first member and the second member can be not welded.
  • the first member and the second member are directly coupled to each other even if movement occurs in the core body exposed portion divided in two due to expansion / contraction of the electrode body due to charge / discharge. Therefore, it moves in synchronism with the movement of the two-divided core body exposed portion, and stress is hardly applied to the resistance welded portion between the two-divided core body exposed portion and the first member and the second member. Therefore, according to the manufacturing method of the square secondary battery of the present invention, each resistance between the current collector, the core exposed portion divided into two parts, the first member, and the second member even when charging and discharging are repeated. It becomes possible to manufacture a high-quality prismatic secondary battery with little deterioration in the quality of the welded portion.
  • the conductive first member and the second member are disposed between the two core exposed portions and the outermost surfaces of the two split core exposed portions. It is arbitrary which of the step of contacting the pair of current collecting members is performed first.
  • a plurality of sets of the conductive first member and the second member are used, and the third step and the fourth step are performed as the conductive first member and the second member. It is preferable to repeat sequentially for each set of two members.
  • the opposing surfaces of the first member and the second member are separated from each other after removing the resistance welding electrode in the fourth step performed for each group.
  • the first member and the second member that have been short-circuited are separated from each other after the pair of resistance welding electrodes are removed in the fourth step after the end of resistance welding. State. Therefore, even when resistance welding is sequentially performed for each group of the first member and the second member, no current flows through the other groups of the conductive first member and the second member. Only the current that flows around the core on the formed side becomes the reactive current. This reactive current is very small compared to the resistance welding current because the core is thin and has high resistance.
  • the current collector member and the core exposed portion divided into two parts are also provided between the plurality of sets of the conductive first member and the second member. Since good resistance welding is performed between one and the first member and between the second member and the other of the core exposed portion divided into two and the current collecting member, the resistance of the welded portion is reduced. Thus, it is possible to manufacture a prismatic secondary battery in which large current charge / discharge is possible and the quality of the welded portion is stabilized.
  • the conductive first member and the second member are respectively insulated between the core-exposed portions on the two divided sides. It is preferable that the insulating holding jig is disposed while being held by a holding jig and the insulating holding jig is removed in the fourth step.
  • the method for manufacturing a rectangular secondary battery of the present invention since the arrangement state of the conductive first member and the second member is stabilized between the core exposed portions divided into two at the time of resistance welding, the book The effects of the invention can be achieved better. Since the insulating holding jig is removed in the fourth step, it does not get in the way when the rectangular secondary battery is manufactured.
  • the conductive first member and the second member are respectively insulated between the core-exposed portions on the two divided sides. And holding the conductive intermediate member between the conductive first member and the second member, and in the third step, for the pair of resistance welding Resistance welding is performed while applying a pressing force to the electrode to short-circuit the first member and the second member via the conductive intermediate member, and in the fourth step, the insulating holder and the conductive member Preferably, the intermediate member is removed.
  • the conductive first member and the second member are each held by an insulating holding jig and a conductive intermediate member is interposed therebetween, the conductivity between the two exposed core parts
  • the arrangement state of the first member and the second member is stabilized, and even when a pressing force is applied to the pair of resistance welding electrodes during resistance welding, the deformation of the core exposed portion divided into two parts is reduced. Therefore, according to the method for manufacturing a prismatic secondary battery of the present invention, better resistance welding is performed, and a prismatic secondary battery in which the quality of the welded portion is stabilized can be manufactured.
  • the conductive first member and the second member each having a groove formed on the outer periphery thereof are used. It is preferable to hold the first member and the second member on the insulating holding jig by fitting an insulating holding jig.
  • the conductive first member and the second member are each formed with a groove on the outer periphery, and the insulating holding jig is fitted in the groove, the conductive first member and the second member are insulated.
  • the holding state of the conductive first member and the second member is stabilized between the two exposed core parts. Therefore, according to the method for manufacturing a prismatic secondary battery of the present invention, good resistance welding is performed, and a prismatic secondary battery in which the quality of the welded portion is stabilized can be manufactured.
  • the conductive first member and the second member are respectively disposed between the core body exposed portions on the two divided sides.
  • the insulating intermediate member is slidable in a state in which the side facing the inner surface of the core exposed portion on the two divided sides is exposed, and the conductive first member and the second member are opposed to each other. It is preferable to use what is arranged in a state of being arranged in the formed hole.
  • the conductive first member and the second member are slidable in a state in which the side facing the inner surface of the core body exposed portion on the two divided sides is exposed, and the conductive first member and the second member If it arrange
  • the conductive first member and the second member are slidably opposed to each other, when a pressing force is applied to the pair of resistance welding electrodes during resistance welding, the first member and the second member are short-circuited.
  • the conductive first member and the second member are disposed between the core-exposed portions on the two divided sides. You may make it use what was arrange
  • the conductive first member and the second member are fixed to the cantilever beams formed on the insulating intermediate member between the two exposed portions of the core body. If it arrange
  • a pressing force is applied to the pair of resistance welding electrodes during resistance welding, the first member and the second member are short-circuited and resistance welding is performed.
  • the pair of resistance welding electrodes are removed after resistance welding, insulation is achieved.
  • the first member and the second member are naturally separated from each other by the elastic force of the cantilever formed on the intermediate member.
  • each of the current collector, the core exposed portion divided into two parts, and the first member and the second member, even when charging and discharging are repeated, is performed. It becomes possible to manufacture a high-quality prismatic secondary battery with little deterioration in the quality of the resistance weld.
  • a protrusion is formed on the side facing the inner surface of the core-exposed portion on the two divided sides. It is preferable to use what is.
  • the projection acts as a so-called projection.
  • Good resistance welding is performed between the first member and the second member and the core exposed portion. Therefore, according to the method for manufacturing a prismatic secondary battery of the present invention, better resistance welding is performed, and a prismatic secondary battery in which the quality of the welded portion is stabilized can be manufactured.
  • the same material as the positive electrode core or the negative electrode core, or a material made of a refractory metal that promotes heat generation, such as tungsten or molybdenum, is used. It can be used, and the protrusion is nickel-plated, and the protrusion and the vicinity of the protrusion are changed to a metal material that promotes heat generation such as tungsten or molybdenum, and the conductive first member and the second member What joined to the edge part of one side by brazing etc. can be used.
  • a method for manufacturing a prismatic secondary battery according to the present invention includes a stacked or wound electrode body having a positive electrode core exposed portion and a negative electrode core exposed portion, and the positive electrode core exposed portion.
  • a method for manufacturing a rectangular secondary battery comprising: a positive electrode current collecting member electrically bonded to a negative electrode current collecting member; a negative electrode current collecting member electrically bonded to the negative electrode core exposed portion; A first conductive step between a first step of dividing at least one of the positive electrode core exposed portion and the negative electrode core exposed portion of the electrode body into two and a core exposed portion on the two divided sides.
  • a plurality of protrusions are formed on one side of the surface of each of the first member and the second member, and the plurality of protrusions are respectively positioned on the inner surface side of the two-divided core body exposed portion.
  • the first member and the second member are disposed apart from each other.
  • a third step of resistance welding between the first member and the two-divided core body exposed portion and between the second member and the two-divided core body exposed portion; and the pair of resistors And a fourth step of removing the welding electrode.
  • the conductive first member and the second member are connected between the core exposed portion on the divided side, and the first member and the second member.
  • a plurality of protrusions are formed on one side of each of the surfaces, and the plurality of protrusions are positioned on the inner surface side of the core exposed portion divided into two, and the first member and the second member are arranged in a state of being separated from each other is doing.
  • the plurality of protrusions of the first member come into contact with one inner surface side of the core body exposed portion on the two divided sides, and the plurality of second members are similarly contacted with the other inner surface side.
  • the first member and the second member are separated from each other.
  • the step of disposing the conductive first member and the second member between the core exposed portions on the two divided sides and the outermost surfaces of the two divided core exposed portions Which one of the steps of contacting the current collecting member first is arbitrary.
  • first current collecting member a pair of resistance welding electrodes are brought into contact with each other, and resistance welding is performed while applying a pressing force to these resistance welding electrodes.
  • the resistance welding current is one of the resistance welding electrodes ⁇ the first current collecting member ⁇ the one of the two core exposed portions ⁇ the one protrusion of the first member ⁇ the first member ⁇ Another projection of the first member ⁇ one of the two exposed core bodies ⁇ second current collecting member ⁇ flows to the other of the pair of resistance welding electrodes.
  • the welding current hardly flows through the second member, and the reactive current is only the current that flows around the core exposed portion.
  • the reactive current value is small because the thickness of the electrode is thin and the internal resistance is large. Therefore, one of the first current collecting member and one of the two exposed core members and one protrusion of the first member, and one of the other protrusions of the first member and the two exposed core members. Good resistance welding is performed between the first current collecting member and the second current collecting member. Further, in resistance welding on the second member side, since the first member and the second member are not in direct contact with each other, good resistance welding can be performed as in the case of resistance welding on the first member side. .
  • the prismatic secondary battery manufactured by such a method for manufacturing a prismatic secondary battery also has a first effect even when the core exposed portion divided into two parts due to expansion / contraction of the electrode body due to charge / discharge causes movement. Since the member and the second member are separated from each other, the member moves in synchronization with the movement of the two-divided core body exposed portion, and resistance welding is performed between the two-divided core body exposed portion and the first and second members. It becomes difficult to apply stress to the club. Therefore, according to the method for manufacturing a rectangular secondary battery of the present invention, the quality of the resistance welded portion between the core exposed portion divided into two parts and the first member and the second member is deteriorated even if charging and discharging are repeated. A small number of high-quality prismatic secondary batteries can be manufactured.
  • the conductive first member and the second member are respectively insulated between the core-exposed portions on the two divided sides.
  • the insulating holding jig may be removed while being held by a holding jig, and the insulating holding jig may be removed in the fourth step.
  • the first member between the core exposed portions on the two divided sides is arranged.
  • the arrangement of the first member and the second member is stabilized.
  • the conductive first member and the second member are insulative between the core-exposed portions on the two divided sides. You may make it arrange
  • the conductive first member and the second member are arranged in a state of being separated from each other in the groove formed in the insulating intermediate member, the conductive first member and the second member are divided into two in a stable state. It can arrange
  • the first member and the second member are insulative intermediate members even if movement occurs in the core exposed portion divided into two due to expansion / contraction of the electrode body accompanying charging / discharging. Since it is slidably held in the groove formed in the groove, it moves in synchronization with the movement of the two-divided core body exposed portion, so that the two-divided core body exposed portion and the first and second members are moved.
  • each resistance between the current collector, the core exposed portion divided into two parts, the first member, and the second member even when charging and discharging are repeated. It becomes possible to manufacture a high-quality prismatic secondary battery with little deterioration in the quality of the welded portion.
  • FIG. 1A is a cross-sectional view of the prismatic nonaqueous electrolyte secondary battery of Embodiment 1
  • FIG. 1B is a cross-sectional view taken along line IB-IB in FIG. 1A
  • FIG. 1C is taken along the IC-IC line in FIG. 1A
  • FIG. 2A is a plan view of the positive electrode intermediate member of Embodiment 1
  • FIG. 2B is a right side view of FIG. 2A
  • FIG. 2C is a cross-sectional view taken along the line IIC-IIC of FIG. 2B.
  • FIG. 3 is a side sectional view showing a resistance welding state in the first embodiment.
  • FIG. 6 is a side cross-sectional view showing an arrangement state of a positive electrode intermediate member portion after welding according to Embodiment 2.
  • FIG. 5A is a plan view of the positive electrode intermediate member of Embodiment 3
  • FIG. 5B is a right side view of FIG. 5A
  • FIG. 5C is a cross-sectional view taken along the line VC-VC of FIG. 5B.
  • FIG. 6A to FIG. 6C are process diagrams for step-by-step description of the resistance welding method for the conductive first member and the second member according to the fourth embodiment.
  • FIG. 7B is an enlarged plan view of the conductive first member and the second member used in Embodiment 4, FIG. 7B is also a right side view, and FIG.
  • FIG. 7C is a cross-sectional view taken along the line VIIC-VIIC in FIG. 7B.
  • FIG. 8A to FIG. 8C are process diagrams for step-by-step explanation of the resistance welding method for the conductive first member and the second member of the fifth embodiment.
  • FIG. 9 is an enlarged plan view of the conductive first member and the second member used in Embodiment 6,
  • FIG. 9B is also a right side view
  • FIG. 9C is a cross section taken along the line IXC-IXC in FIG. 9B.
  • FIG. It is side part sectional drawing which shows the resistance welding state in Embodiment 7.
  • 11A is an enlarged plan view of the conductive first member and the second member used in Embodiment 7, FIG.
  • FIG. 11B is also a right side view
  • FIG. 11C is a cross section taken along line XIC-XIC in FIG. 11B
  • FIG. 12A is a cross-sectional view of an electric double layer capacitor as a conventional power storage element
  • FIG. 12B is a cross-sectional view taken along line XIIB-XIIB in FIG. 12A
  • FIG. 12C is a cross-sectional view taken along line XIIC-XIIC in FIG.
  • It is a figure which shows the welding process between the core exposed part of an electrode in FIG. 12, and a current collection member.
  • FIG. 15A is an exploded perspective view showing a state before welding of another conventional positive electrode terminal and the positive electrode core exposed portion
  • FIG. 15B is a perspective view after welding.
  • the power generation element that can be used in the present invention is formed by laminating or winding the positive electrode plate and the negative electrode plate via a separator, so that a plurality of positive electrode core exposed portions are formed at one end,
  • the present invention can be applied to a flat shape in which a plurality of negative electrode core exposed portions are formed at the other end portion, but the following description will be made on behalf of a flat wound electrode body.
  • FIG. 1A is a cross-sectional view of the prismatic nonaqueous electrolyte secondary battery according to Embodiment 1
  • FIG. 1B is a cross-sectional view taken along line IB-IB of FIG. 1A
  • FIG. 1C is an IC-IC of FIG. 1A. It is sectional drawing along a line.
  • 2A is a plan view of the positive electrode intermediate member of Embodiment 1
  • FIG. 2B is a right side view of FIG. 2A
  • FIG. 2C is a cross-sectional view taken along the line IIC-IIC of FIG. 2B.
  • FIG. 3 is a side sectional view showing a resistance welding state in the first embodiment.
  • the rectangular nonaqueous electrolyte secondary battery 10 has a flat wound electrode body 11 in which a positive electrode plate and a negative electrode plate are wound via a separator (both not shown).
  • the positive electrode plate is produced by applying a positive electrode active material mixture on both surfaces of a positive electrode core made of aluminum foil, drying and rolling, and then slitting the aluminum foil so as to be exposed in a strip shape.
  • the negative electrode plate is produced by applying a negative electrode active material mixture on both surfaces of a negative electrode core made of copper foil, drying and rolling, and then slitting so that the copper foil is exposed in a strip shape.
  • the positive electrode plate and the negative electrode plate obtained as described above are so arranged that the aluminum foil exposed portion of the positive electrode plate and the copper foil exposed portion of the negative electrode plate do not overlap with the facing active material layers. And is wound through a polyethylene microporous separator, so that one end in the winding axis direction is provided with a plurality of overlapping positive electrode core exposed portions 14, and the other end is overlapped with a plurality of sheets. Further, a flat wound electrode body 11 having the negative electrode core exposed portion 15 is produced.
  • the plurality of positive electrode core exposed portions 14 are laminated and connected to the positive electrode terminal 17 via the positive electrode current collecting member 16, and the plurality of negative electrode core exposed portions 15 are similarly laminated to form the negative electrode current collecting member 18.
  • To the negative electrode terminal 19 an example in which the positive electrode current collecting member 16 and the negative electrode core exposed portion 15 are directly connected to the positive electrode terminal 17 and the negative electrode terminal 19, respectively, is shown.
  • the exposed portion 15 may be connected to the positive electrode terminal 17 and the negative electrode terminal 19 through a separate conductive member.
  • the positive terminal 17 and the negative terminal 19 are fixed to the sealing plate 13 via insulating members 20 and 21, respectively.
  • an insulating resin sheet 23 is interposed around the flat wound electrode body 11 produced as described above except for the sealing plate 13 side. After being inserted into the rectangular battery outer can 12, the sealing plate 13 is laser welded to the opening of the battery outer can 12, and then a nonaqueous electrolytic solution is injected from the electrolytic solution injection hole 22. It is produced by sealing the liquid hole 22.
  • the flat wound electrode body 11 includes a plurality of stacked positive electrode core exposed portions 14 divided into two on the positive electrode plate side, and a positive electrode intermediate member therebetween.
  • 24A is arranged.
  • the positive electrode intermediate member 24A includes a plurality of first members 24B and second members 24C made of a conductive material in holes formed in an insulating intermediate member 24D made of a resin material.
  • the sets, here two sets, are slidably arranged.
  • the first member 24B and the second member 24C of each set are arranged in a straight line in the stacking direction of the stacked positive electrode core exposed portions 14, respectively, and a surface facing the positive electrode core exposed portion 14 of the first member 24B.
  • first member 24B and the second member 24C have a minute distance that does not electrically short-circuit each other.
  • a plurality of laminated negative electrode core exposed portions 15 are divided into two, and a plurality of sets of first and second members (both not shown) made of a conductive material are interposed between them.
  • the negative electrode intermediate member 25A is disposed so as to be slidable in the hole formed in the insulating intermediate member made of resin material in two pairs.
  • the first member and the second member are arranged in a straight line in the stacking direction of the stacked negative electrode core exposed portions 15, and are opposite to the surface of the first member facing the negative electrode core exposed portion 15.
  • the surface on the side opposite to the surface facing the negative electrode core exposed portion 15 of the second member faces each other in a state of being separated by a minute distance so as not to be electrically short-circuited.
  • positive current collecting members 16 are arranged on both outermost surfaces of the positive electrode core exposed portion 14 located on both sides of the positive electrode intermediate member 24A, and are located on both sides of the negative electrode intermediate member 25A.
  • Negative electrode current collecting members 18 are respectively disposed on the outermost surfaces of the negative electrode core exposed portion 15. Specific configurations and operations of the positive electrode intermediate member 24A and the negative electrode intermediate member 25A will be described later.
  • the first member 24B and the second member 24C constituting the positive electrode intermediate member 24A are made of aluminum, which is the same material as the positive electrode core, and the first member and the second member constituting the negative electrode intermediate member 25A are the negative electrode. Although it is made of copper, which is the same material as the core body, each shape may be the same or different.
  • examples of materials that can be used as the insulating intermediate member 24D made of the resin material constituting the positive electrode intermediate member 24A and the intermediate intermediate member 25A for the negative electrode include polypropylene (PP), polyethylene (PE), poly Examples thereof include vinylidene chloride (PVDC), polyacetal (POM), polyamide (PA), polycarbonate (PC), polyphenylene sulfide (PPS), and the like.
  • the positive electrode intermediate member 24A and the negative electrode intermediate member 25A are each made of an insulating material made of a resin material.
  • the set of the first member 24B and the second member 24C is a required battery. Depending on the output, etc., one set may be used, or three or more sets may be used.
  • two or more sets of the conductive first member 24B and the second member 24C are slidably disposed in the hole formed in the insulating intermediate member 24D made of one resin material. Therefore, the conductive first member and the second member of each set can be positioned and arranged in a stable state between the core exposed portions on the divided side.
  • the first member 24B and the second member 24C constituting the positive electrode intermediate member 24A are divided into two positive electrode cores. Both the inner surface of the body exposed portion 14 are resistance welded, and similarly, a negative electrode intermediate member 25A is formed between the negative electrode current collecting member 18 and the outermost surface of the divided negative electrode core body exposed portion 15.
  • the first member and the second member to be welded together and the inner surface of the negative electrode core body exposed portion 15 divided into two are also resistance welded.
  • FIG. 2 shows a resistance welding method using 24A and a resistance welding method using a negative electrode core exposed portion 15, a negative electrode current collecting member 18, a negative electrode intermediate member 25A having a conductive first member and a second member.
  • the shape of the positive electrode intermediate member 24A and the shape of the negative electrode intermediate member 25A can be substantially the same, and the respective resistance welding methods are also substantially the same. In the following, description will be made by representing the positive electrode plate side.
  • the positive electrode plate and the negative electrode plate are shifted so that the aluminum foil exposed portion of the positive electrode plate and the copper foil exposed portion of the negative electrode plate do not overlap with the opposing active material layers of the electrode, respectively,
  • the positive electrode core exposed portion 14 of the flat wound electrode body 11 obtained by winding through a separator is divided into two on both sides from the winding center portion, and the positive electrode core is centered on 1/4 of the electrode body thickness.
  • the body exposed part 14 was collected.
  • the thickness of the collected aluminum foil is about 660 ⁇ m on one side, and the total number of laminated layers is 88 (44 on one side).
  • the positive electrode current collecting member 16 was manufactured by punching an aluminum plate having a thickness of 0.8 mm and bending it.
  • the positive electrode current collecting member 16 may be manufactured from an aluminum plate by casting or the like.
  • the positive electrode current collector member 16 is disposed on both surfaces of the outermost peripheral side of the positive electrode core exposed portion 14, the positive electrode intermediate member 24A having the first member 24B and the second member 24C on the inner peripheral side, the first member 24B and the first member 24B.
  • the conical projections 24b and 24c on both sides of the two members 24C are inserted between the positive electrode core exposed portions 14 divided into two so that the positive electrode core exposed portions 14 abut each other.
  • the positive electrode intermediate member 24A includes a first member 24B and a second member 24C having the same shape.
  • the first member 24B and the second member 24C are initially separated by a minute distance L and are slidably disposed in a hole formed in the insulating intermediate member 24D made of a resin material.
  • the minute distance L is in contact with the first member 24B and the second member 24C.
  • the pressing force is removed, it is selected within a range in which the contact with the first member 24B and the second member 24C is substantially released.
  • the first member 24B and the second member 24C have, for example, a columnar shape, and truncated cone-shaped protrusions 24b and 24c are formed at both ends, respectively.
  • An opening may be formed in each of the frustoconical protrusions 24b and 24c.
  • the height of the frustoconical protrusions 24b and 24c may be approximately the same as that of the protrusion (projection) generally formed on the resistance welding member, that is, approximately several millimeters.
  • the diameter and length of the first member 24B and the second member 24C constituting the positive electrode intermediate member 24A vary depending on the flat wound electrode body 11 and the battery outer can 12 (see FIG. 1). It may be about 3 mm to several tens of mm.
  • the shape of the first member 24B and the second member 24C constituting the positive electrode intermediate member 24A has been described as a cylindrical shape. However, as long as it is a metal block shape such as a prismatic shape or an elliptical columnar shape. Arbitrary shapes can be used. *
  • the positive electrode intermediate member 24A In the positive electrode intermediate member 24A according to the first embodiment, two sets of the first member 24B and the second member 24C are integrally held in holes formed in the insulating intermediate member 24D made of a resin material. In this case, the first member 24B and the second member 24C of each set are held so as to be parallel to each other, and the stacking direction of the positive electrode core exposed portion 14 in which the first member 24B and the second member 24C are stacked. Positive electrode core exposure in which one of the end surfaces of the first member 24B and the second member 24C, that is, the side on which the frustoconical protrusions 24b and 24c are formed is divided into two, respectively.
  • the other end surface of the first member 24B and the second member 24C is disposed so as to face each other with a minute distance L therebetween.
  • the shape of the insulating intermediate member 24D made of a resin material constituting the positive electrode intermediate member 24A can be any shape such as a prismatic shape or a cylindrical shape, but is stable between the two positive electrode core exposed portions 14.
  • a horizontally long prismatic shape is used here.
  • the length w of the positive electrode intermediate member 24A varies depending on the size of the prismatic nonaqueous electrolyte secondary battery, but can be 20 mm to several tens of mm.
  • the width h of the positive electrode intermediate member 24A is equal to that of the positive electrode intermediate member 24A.
  • a groove may be formed in the outer peripheral portion or a cavity may be formed inside in order to improve gas venting during resistance welding.
  • the positive electrode current collector 16 between the pair of resistance welding electrode rods 31 and 32 arranged above and below, and the positive electrode intermediate member between the two divided positive electrode core exposed portions 14 24A is disposed as a flat wound electrode body 11, and a pair of resistance welding electrode rods 31 and 32 are disposed on both sides of the outermost peripheral side of the positive electrode core body exposed portion 14, respectively. 16 is contacted.
  • the positive electrode current collecting member 16 is arranged on both surfaces of the outermost peripheral side of the positive electrode core exposed portion 14 before the positive electrode intermediate member 24A is arranged between the two divided positive electrode core exposed portions 14. Or later.
  • the first member 24B and the second member 24C come into contact with each other as shown by the arrow III portion on the left side of FIG. As a result, it is electrically short-circuited.
  • the resistance welding current is, for example, from the resistance welding electrode rod 31 to the lower positive electrode current collecting member 16 and the divided positive electrode core exposed portion 14.
  • the first member 24B, the second member 24C, the divided core exposed portion 14, the upper positive electrode current collecting member 16, and the resistance welding electrode rod 32 flow.
  • the resistance between the short-circuited conductive first member 24B and the second member 24C is small because the contact area between both is large, and the heat capacity of the first member 24B and the second member 24C is large,
  • the fusion between the first member 24B and the second member 24C is the fusion between the core body exposed portion 14 divided into two and the first member 24B, and the core exposed portion 14 divided into two and the second member 24B. It is less likely to occur than fusion with the member 24C. Therefore, when the pair of resistance welding electrode rods 31 and 32 is removed after resistance welding, the pressed positive electrode core exposed portion 14 divided into two returns to a state close to the shape before resistance welding due to elasticity.
  • the first member 24B and the second member 24C are welded to the divided positive electrode core exposed portion 14, respectively, the first member 24B and the second member 24C move in opposite directions. Then leave. Therefore, after resistance welding, the first member 24B and the second member 24C of each set are not in direct contact.
  • the positive electrode divided into two parts between the positive electrode current collecting member 16 and one of the two divided positive electrode core exposed portions 14 Between one of the core body exposed portions 14 and the first member 24B, between the second member 24C and the other of the positive electrode core exposed portion 14 divided into two, and the other of the two divided core body exposed portions 14 and the positive electrode Good resistance welding is also performed between the current collecting member 16 and the current collecting member 16.
  • the positive electrode intermediate member 24A is arranged in a stably positioned state between the two divided positive electrode core exposed portions 14, so that resistance welding is performed accurately and stably. Therefore, it is possible to suppress a variation in welding strength, to realize a reduction in resistance of the welded portion, and to manufacture a rectangular secondary battery capable of charging and discharging a large current.
  • the positive electrode core body exposed portion 14 divided between the first member 24B and the second member 24C is divided into two parts.
  • the positive electrode current collector 16 connected to both outermost peripheral sides of the positive electrode core exposed portion 14 is an integrated body obtained by bending a single aluminum plate material. Since the parts located on both outermost peripheral sides can bend, the first member 24B and the second member 24C are not prevented from moving individually.
  • the example in which the projections 24b and 24c are formed as the conductive first member 24B and the second member 24C that form the positive electrode intermediate member 24A has been described. It is not always necessary to provide the protrusions 24b and 24c, and the protrusions may not be formed. Further, in the case where the protrusions are provided, the example of using the truncated cone shape as the shape of the protrusions 24b and 24c is shown. A thing with which opening (dent) is formed in the tip part of a projection can also be used. When the projections 24b and 24c are not formed with openings, the operations of the projections 24b and 24c are the same as those of the projection at the time of conventional resistance welding. Since current concentrates around the opening, the heat generation state becomes good, and resistance welding can be performed more satisfactorily.
  • Embodiment 2 In addition, in the said Embodiment 1, the example (refer FIG. 3) which made the positive electrode current collection member 16 contact
  • FIG. 4 is a side cross-sectional view showing an arrangement state of the positive electrode intermediate member portion after welding according to the second embodiment.
  • the flat wound electrode body 11 and the positive electrode intermediate member 24A are the same as those used in the first embodiment, and the same as those in the first embodiment.
  • the same reference numerals are given to the constituent parts, and detailed description thereof is omitted.
  • the positive electrode current collecting member 16 connected to the positive electrode terminal 17 is placed in contact with the outermost one surface of the divided positive electrode core exposed portion 14.
  • the current collector receiving member 16a is disposed in contact with the other outermost surface of the two-divided positive electrode core exposed portion 14, and a pair is provided between the positive electrode current collecting member 16 and the current collecting receiving member 16a. Resistance welding was performed by contacting the electrode rod for resistance welding.
  • the current collection receiving member 16a is not directly connected to the positive electrode terminal 17 and plays the role of receiving one side of the pair of resistance welding electrode rods during resistance welding.
  • the “current collecting member” in the present invention is used to include such a “current collecting member”.
  • resistance welding can be performed in the state where the direction which arrange
  • the conductive first member 24B and the second member 24C that form the positive electrode intermediate member 24A are provided in the holes formed in the insulating intermediate member 24D made of a resin material for each set.
  • a cantilever is formed on the insulating intermediate member 24D made of a resin material, and the conductive first member 24B and the second member are formed on the cantilever. 24C was fixed.
  • the positive electrode intermediate member 24A of Embodiment 3 will be described with reference to FIG.
  • the insulating intermediate member 24D made of a resin material forming the positive electrode intermediate member 24A used in the third embodiment two cantilevers 24f are formed at both ends in the length direction.
  • the conductive first member 24B and the second member 24C forming the positive electrode intermediate member 24A are straight in the stacking direction of the stacked positive electrode core exposed portions 14 for each set.
  • the other end surfaces of the first member 24B and the second member 24C are fixed so as to face each other with a minute distance L therebetween.
  • the positive electrode intermediate member 24A of the third embodiment When the positive electrode intermediate member 24A of the third embodiment is arranged between the two divided positive electrode core exposed portions 14 and resistance welding is performed in the same manner as in the first embodiment, it is fixed to the cantilever beam 24f during resistance welding.
  • the conductive first member 24B and the second member 24C are short-circuited, but when the resistance welding electrode rod is removed, the conductive first member 24B and the second member 24C are separated from each other. Similar actions and effects can be achieved.
  • the conductive first member 24B and the second member 24C are shown as examples using the positive electrode intermediate member 24A held by the insulating intermediate member 24D made of a resin material. 4, the positive electrode core body exposed portion divided into two while holding the conductive first member 24 ⁇ / b> B and the second member 24 ⁇ / b> C by an insulating holding jig without using the insulating intermediate member 24 ⁇ / b> D made of a resin material. The insulating holding jig is removed after resistance welding. A resistance welding method for the conductive first member 24B and the second member 24C according to the fourth embodiment will be described with reference to FIGS.
  • FIG. 6A to 6C are process diagrams for explaining the resistance welding method for the conductive first member 24B and the second member 24C of Embodiment 4 in order.
  • 7A is an enlarged plan view of the conductive first member 24B and the second member 24C used in Embodiment 4
  • FIG. 7B is a right side view of the same
  • FIG. 7C is a line VIIC-VIIC in FIG. 7B.
  • FIG. 7A is an enlarged plan view of the conductive first member 24B and the second member 24C used in Embodiment 4
  • FIG. 7B is a right side view of the same
  • FIG. 7C is a line VIIC-VIIC in FIG. 7B.
  • each set of conductive first member 24B and second member 24C is attached to holding jigs 27a and 27b formed of a pair of insulating materials.
  • the pair of holding jigs 27a and 27b may be held and operated, or may be separately attached to an automatically controlled device such as a robot arm.
  • the pair of holding jigs 27a and 27b holding the conductive first member 24B and the second member 24C in this way are arranged on the outermost side of the positive electrode core exposed portion 14 divided into two parts.
  • the positive electrode current collector member 16 After the positive electrode current collector member 16 is disposed on each of the two surfaces, the positive electrode current collector member 16 is inserted into the positive electrode core exposed portion 14 divided into two parts, and a pair of resistance welding electrode rods 31 and 32 are brought into contact with the surface of the positive electrode current collector member 16. Resistance welding is performed while applying a pressing force between the pair of resistance welding electrode rods 31 and 32.
  • the resistance between the short-circuited conductive first member 24B and the second member 24C is small because the contact area between both is large, and the heat capacity of the first member 24B and the second member 24C is large,
  • the fusion between the first member 24B and the second member 24C is the fusion between the core body exposed portion 14 divided into two and the first member 24B, and the core exposed portion 14 divided into two and the second member 24B. It is less likely to occur than fusion with the member 24C. Therefore, when the pair of resistance welding electrode rods 31 and 32 is removed after resistance welding and the holding jigs 27a and 27b are removed, the pressed positive electrode core body exposed portion 14 is elastically bonded to the resistance welding before the resistance welding.
  • resistance welding is first performed. Since the first member 24B and the second member 24C are separated from each other at this point, no resistance welding current flows. Therefore, only the current that flows around the positive electrode core on the two divided sides is the reactive current. It becomes. This reactive current has a large resistance because the thickness of the positive electrode core is thin, and is very small compared to the resistance welding current. Therefore, also in the subsequent resistance welding, between the positive electrode current collecting member 16 and one of the two divided positive electrode core exposed portions 14, one of the two divided positive electrode core exposed portions 14 and the first member 24B. Between the second member 24C and the other half of the core exposed portion 14 divided into two, and between the other end of the core exposed portion 14 divided into two and the positive electrode current collecting member 16, good resistance welding is performed. Is called.
  • the pair of holding jigs 27a and 27b are removed, so that there is no obstacle in assembling the rectangular secondary battery.
  • the conductive first member 24B and the second member 24C are disposed in a stably positioned state between the positive electrode core exposed portions 14 divided into two by the holding jigs 27a and 27b, Effects and effects similar to those of the first embodiment can be obtained.
  • the conductive first member 24B and the second member 24C are formed with grooves 24d and 24e on the outer periphery, and a pair of holding jigs in the grooves 24d and 24e, respectively. It is preferable to fix by engaging the tip portions of 27a and 27b.
  • the conductive first member 24B and the second member 24C can be stably attached to the pair of holding jigs 27a and 27b, so that the resistance can be more accurately and stably maintained. It becomes possible to weld, and it is suppressed that welding strength varies.
  • the conductive first member 24B and the second member 24C are held by the insulating holding jigs 27a and 27b, respectively, and the conductive first member 24B and the second member 24C are electrically conductive.
  • the intermediate member 27c is disposed between the positive electrode core exposed portions 14 divided into two parts, and the insulating holding jig is removed after resistance welding.
  • a resistance welding method for the conductive first member 24B and the second member 24C of the fifth embodiment will be described with reference to FIG. 8A to 8C are process diagrams for explaining the resistance welding method for the conductive first member 24B and the second member 24C of Embodiment 5 in order.
  • the flat wound electrode body 11 and the positive electrode intermediate member 24A are the same as those used in the first embodiment, and are the same as those in the first embodiment. The same reference numerals are given to the constituent parts, and detailed description thereof is omitted.
  • each set of conductive first member 24B and second member 24C is attached to holding jigs 27a and 27b formed of a pair of insulating materials.
  • a member in which a conductive intermediate member 27c made of, for example, the same material as the first member 24B and the second member 24C is disposed between the first member 24B and the second member 24C is used.
  • the pair of holding jigs 27a and 27b and the conductive intermediate member 27c may be held and operated, or may be separately attached to an automatically controlled device such as a robot arm.
  • the pair of holding jigs 27a and 27b and the conductive intermediate member 27c holding the conductive first member 24B and the second member 24C are divided into two as shown in FIG. 8B.
  • the positive electrode current collecting members 16 are disposed on both outermost surfaces of the two-divided positive electrode core exposed portion 14, and a pair of resistance welding electrodes are formed on the surfaces of these positive electrode current collecting members 16
  • the rods 31 and 32 are brought into contact with each other, and resistance welding is performed while applying a pressing force between the pair of resistance welding electrode rods 31 and 32.
  • the resistance welding current is, for example, resistance welding From the electrode bar 31, the lower-side positive electrode current collecting member 16, the divided positive electrode core exposed portion 14, the first member 24B, the conductive intermediate member 27c, the second member 24C, and the divided core exposed portion 14, flows to the upper positive electrode current collecting member 16 and the resistance welding electrode rod 32.
  • the resistance between each of the conductive first member 24B, the conductive intermediate member 27c, and the second member 24C short-circuited with each other is small because the contact area between them is large, and the first member 24B, Since the heat capacity of the conductive intermediate member 27c and the second member 24C is large, the fusion between the first member 24B, the conductive intermediate member 27c and the second member 24C is performed by dividing the core exposed portion 14 divided into the first member 24 and the first member 24C. It is less likely to occur than the fusion between the member 24B and the fusion between the divided core exposed portion 14 and the second member 24C.
  • the positive electrode core exposed portion 14 divided into two parts is pressed.
  • the shape returns to the state before resistance welding due to elasticity, but the conductive first member 24B and the second member 24C are welded to the positive electrode core exposed portion 14 divided into two parts, respectively.
  • the first member 24B and the second member 24C are separated from each other. Therefore, after resistance welding, the first member 24B and the second member 24C of each set are not in direct contact.
  • the conductive first member 24B and the second member 24C are fixed to another pair of holding jigs 27a and 27b, and the conductive intermediate member 27c is interposed between the conductive first member 24B and the second member 24C.
  • the first member 24B and the second member 24C are in a state of being separated from each other at the location where resistance welding is first performed. Since no current flows, only the current that flows around the positive electrode core on the divided side becomes a reactive current. This reactive current has a large resistance because the thickness of the positive electrode core is thin, and is very small compared to the resistance welding current.
  • the pair of holding jigs 27a and 27b and the conductive intermediate member 27c are removed, so that there is no hindrance when assembling the rectangular secondary battery.
  • the conductive first member 24B and the second member 24C are arranged in a stably positioned state between the positive electrode core exposed portion 14 divided into two by the holding jigs 27a and 27b and the conductive intermediate member 27c. Therefore, substantially the same operations and effects as in the case of the first embodiment can be achieved.
  • the conductive first member 24B and the second member 24C used in the fifth embodiment also have a groove formed on the outer periphery, similar to the fourth embodiment shown in FIGS. 7A to 7C. Can be used.
  • FIG. 9 is an enlarged plan view of the conductive first member and the second member used in the sixth embodiment.
  • 9B is a right side view
  • FIG. 9C is a cross-sectional view taken along the line IXC-IXC in FIG. 9B.
  • FIG. 10 is a side sectional view showing a resistance welding state in the sixth embodiment.
  • the positive electrode intermediate member 24 ⁇ / b> G having such a shape is positioned on the inner surface side of the positive electrode core body exposed portion 14 in which the pair of protrusions 24 g and 24 h of the first member 24 ⁇ / b> H are each divided into two. Further, the pair of protrusions 24i and 24j of the second member 24I are disposed between the two divided positive electrode core exposed portions 14 so as to be located on the inner surface side of the divided positive electrode core exposed portion 14, respectively. Then, the positive electrode current collecting member 16 electrically connected to the positive electrode terminal 17 is divided into one of the first members 24H (left side in FIG. 10) on both outermost surfaces of the positive electrode core exposed portion 14 divided into two. The frustoconical protrusion 24g and one of the second members 24I are disposed at positions facing the frustoconical protrusion 24i.
  • the other (right side in FIG. 10) frustoconical protrusions 24h and the second ones of the first member 24H.
  • the member 24I is disposed at a position facing the other frustoconical protrusion 24j.
  • the positive electrode current collecting member 16 and the positive electrode current collecting member 16a are not directly connected but are electrically connected to each other via the positive electrode core exposed portion 14 divided into two parts.
  • the pair of resistance welding electrode rods 31 and 32 are brought into contact with each other between the positive electrode current collecting member 16 and the positive electrode current collecting member 16a on the second member 24I side. Resistance welding is performed while applying a pressing force to the resistance welding electrode rods 31 and 32 toward the second member 24I side. Then, the resistance welding current is, for example, the resistance welding electrode rod 31 ⁇ the positive electrode current collecting member 16 ⁇ the divided positive electrode core exposed portion 14 ⁇ the truncated cone-shaped protrusion 24i ⁇ the second member 24I ⁇ the truncated cone shape. It flows through the projection 24j ⁇ the positive electrode core exposed portion 14 divided into two ⁇ the current collecting member 16a for positive electrode ⁇ the electrode rod 32 for resistance welding.
  • the first member 24H and the second member 24I are not directly electrically connected. Therefore, no welding current flows through the second member 24I, and the reactive current bypasses the positive electrode core exposed portion 14. Although the current flows only, the reactive current value is small because the positive electrode core is thin and the internal resistance is large.
  • a truncated cone-shaped protrusion Resistance welding portions are formed between the positive electrode core exposed portion 14 divided into 24j and the positive electrode core exposed portion 14 divided into two and the positive current collecting member 16a.
  • the resistance welding is good as in the case of resistance welding on the second member 24I side. Resistance welding can be performed.
  • the prismatic secondary battery produced in the sixth embodiment even if movement occurs in the positive electrode core exposed portion 14 divided into two by expansion and contraction of the flat wound electrode body 11 due to charge and discharge, Since the first member 24H and the second member 24I are slidably arranged in the groove formed in the insulating intermediate member 24J, the first member 24H and the second member 24I move in synchronization with the movement of the divided positive electrode core exposed portion 14. Therefore, substantially the same operation and effect as in the case of the first embodiment can be achieved.
  • the conductive first member 24H and the second member 24I are shown as examples using the positive electrode intermediate member 24G held by the insulating intermediate member 24J made of a resin material.
  • the conductive first member 24H and the second member 24I are each made of an insulating holding jig as in the case of the fourth embodiment shown in FIG. It is arranged between the positive electrode core exposed portions 14 divided into two while being held by (not shown), and the insulating holding jig is removed after resistance welding.
  • a specific configuration of the conductive first member 24H and the second member 24J of the seventh embodiment will be described with reference to FIG.
  • FIG. 11A is an enlarged plan view of the conductive first member and the second member used in Embodiment 7, FIG. 11B is a right side view, and FIG. 11C is along the XIC-XIC line in FIG. 11B.
  • FIG. 11A is an enlarged plan view of the conductive first member and the second member used in Embodiment 7, FIG. 11B is a right side view, and FIG. 11C is along the XIC-XIC line in FIG. 11B.
  • the insulating intermediate member 24J made of a resin material is removed from the positive electrode intermediate member 24G of the sixth embodiment as the conductive first member 24H and the second member 24I. Furthermore, a groove 24k is provided between the frustoconical protrusions 24g and 24h on both sides of the first member 24H, and a groove 24m is provided between the frustoconical protrusions 24i and 24j on both sides of the second member 24I. Are respectively formed. As in the case of the fourth embodiment, the grooves 24k and 24m are positions to be held by an insulating holding jig.
  • the first member 24H and the second member 24I are detachably held by a pair of holding jigs and placed between the positive electrode core exposed portions 14 divided into two, and the embodiment shown in FIG.
  • resistance welding on the second member side is performed.
  • the positive electrode current collector member 16 and the positive electrode core body exposed portion 14 divided in half are divided into two divided positive electrode core body exposed portions 14 and truncated cone-shaped protrusions 24i. Resistance welding between the frustoconical protrusion 24j and the divided positive electrode core exposed portion 14 and between the divided positive electrode core exposed portion 14 and the positive electrode current collector receiving member 16a. Part is formed.
  • the positive electrode core divided in two is also provided on the first member side between the positive electrode current collecting member 16 and the divided positive electrode core exposed portion 14. Between the body exposed portion 14 and the truncated cone-shaped protrusion 24g, between the truncated cone-shaped projection 24h and the divided positive electrode core exposed portion 14, and divided into two divided positive electrode core exposed portions 14 and a positive electrode collection. Resistance welding portions are formed between the power receiving member 16a and each. Thereafter, by removing the pair of holding jigs, the resistance welding process of the seventh embodiment is completed.
  • the production of the prismatic secondary battery as the first and second members and the first and second members for the negative electrode for the positive electrode, the shape of each protrusion Different ones can also be used.
  • Embodiments 1, 2, 4 and 5 an example using two sets of the first member and the second member is shown. Depending on the size, required output, etc., one set or three or more sets can be used.
  • the third embodiment an example in which one positive electrode intermediate member having two sets of the first member and the second member is used is shown.
  • a pair of the first member and the second member is used. In this case, a plurality of sets of positive electrode intermediate members can be used according to the size of the battery, the required output, and the like.
  • the case of the positive electrode substrate exposed portion has been described as a substrate exposed portion of the two divided side can be similarly applied to the case of the negative electrode substrate exposed portion, further Can be applied simultaneously to both the positive electrode core exposed portion side and the negative electrode core exposed portion.
  • SYMBOLS 10 Square nonaqueous electrolyte secondary battery 11 ... Flat wound electrode body 12 ... Battery outer can 13 ... Sealing plate 14 ... Positive electrode core exposed part 15 ... Negative electrode core exposed part 16 ... Current collecting member 16a for positive electrodes Current collecting member for positive electrode 17 ... Positive electrode terminal 18 ... Current collecting member for negative electrode 19 ... Negative electrode terminal 20, 21 ... Insulating member 22 ... Electrolyte injection hole 23 ... Resin sheet 24A, 24G ... Intermediate member for positive electrode 24B, 24H ... First member 24C, 24I ... Second member 24D, 24J ... Insulating intermediate member 24E ... Gap 24b, 24c, 24g to 24j ...

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

[Problème] L'invention concerne un accumulateur rectangulaire dans lequel une quantité de contrainte agissant sur une section soudée par résistance est faible, la contrainte étant causée par une expansion/contraction d'un corps d'électrode pendant la charge/décharge ; la résistance de la section soudée peut être réduite ; et la qualité des parties soudées par résistance est plus stable. [Solution] Cet accumulateur rectangulaire a une configuration dans laquelle : une section à noyau exposé (14) d'un corps d'électrode (11) qui a été stratifié ou enroulé en une forme plate est recoupée ; une pluralité de groupes de premiers éléments (24B) et de seconds éléments (24C) électroconducteurs sont agencés linéairement dans cette coupure et disposés de telle sorte qu'une surface d'extrémité de chacun des premiers éléments (24B) et seconds éléments (24C) est positionné sur un côté de surface intérieure de la section à noyau exposé recoupée (14), et que les autres surfaces d'extrémité se fassent face à une certaine distance les unes des autres ; et une paire d'éléments collecteurs de courant (16) sont positionnés de manière à être en contact avec les deux surfaces sur le côté le plus à l'extérieur de la section à noyau exposé recoupée (14), et soudés par résistance à celles-ci.
PCT/JP2011/076037 2010-12-29 2011-11-11 Accumulateur rectangulaire et son procédé de fabrication WO2012090600A1 (fr)

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