WO2012133329A1 - Procédé de fabrication d'une batterie secondaire rectangulaire - Google Patents

Procédé de fabrication d'une batterie secondaire rectangulaire Download PDF

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Publication number
WO2012133329A1
WO2012133329A1 PCT/JP2012/057779 JP2012057779W WO2012133329A1 WO 2012133329 A1 WO2012133329 A1 WO 2012133329A1 JP 2012057779 W JP2012057779 W JP 2012057779W WO 2012133329 A1 WO2012133329 A1 WO 2012133329A1
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WIPO (PCT)
Prior art keywords
positive electrode
resistance welding
current collecting
intermediate conductive
conductive member
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PCT/JP2012/057779
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English (en)
Japanese (ja)
Inventor
佑介 富松
毅典 木村
山西　伸和
Original Assignee
三洋電機株式会社
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Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to JP2013507564A priority Critical patent/JP6072676B2/ja
Publication of WO2012133329A1 publication Critical patent/WO2012133329A1/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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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

Definitions

  • the present invention relates to a method for manufacturing a prismatic secondary battery having a core exposed portion that is laminated and divided into two. Specifically, in the present invention, at least one of the laminated positive electrode core exposed portion and negative electrode core exposed portion is divided into two, and an intermediate conductive member is disposed between the two divided core exposed portions, and the core
  • the present invention relates to a method for manufacturing a rectangular secondary battery having a current collecting structure in which a resistance welding is performed between an exposed portion and a current collecting member and between a core exposed portion and an intermediate conductive member.
  • 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.
  • non-aqueous electrolyte secondary batteries for EV and HEV use a lot of prismatic secondary batteries in which a power generation element is housed in a rectangular outer can made of an aluminum-based metal. Therefore, it is necessary to reduce the internal resistance of the battery as much as possible. For this reason, various improvements have been made to reduce the internal resistance by preventing poor welding between the positive electrode plate or the negative electrode plate core of the battery power generation element and the current collecting member.
  • an electrode body of a square sealed 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 or the negative electrode plate are arranged to be located on different sides, respectively, 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 square sealed secondary battery such as a lithium ion secondary battery for EV and HEV is large.
  • 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. 8A is a cross-sectional view of an electric double layer capacitor as a power storage element disclosed in Patent Document 1 below
  • FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB of FIG. 8A
  • FIG. 8C is a cross-sectional view of FIG.
  • FIG. 8 is a sectional view taken along line VIIIC-VIIIC.
  • FIG. 9 is a figure which shows the welding process between the core exposed part of an electrode in FIG. 8, and a current collection member.
  • the power storage device 50 includes a wound electrode body 51 in which a positive electrode plate and a negative electrode plate are stacked 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 body 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.
  • 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.
  • a prismatic secondary battery having a large capacity such as a lithium ion secondary battery for EV and HEV
  • the number of stacked positive electrode core exposed portions and negative electrode core exposed portions is that of the invention disclosed in Patent Document 1 above. It is much more than the case, and the lamination thickness is much thicker.
  • a square sealed secondary battery having a large capacity such as a lithium ion secondary battery for EV and HEV
  • superposition as a welding method between the stacked positive electrode core exposed portion and the negative electrode core exposed portion and the current collecting member is super.
  • large pressurization and ultrasonic vibration are used to bring the stacked positive electrode core exposed portion and negative electrode core exposed portion into close contact with the current collecting member.
  • Large energy is required to reach the other end side of the stacked positive electrode core exposed portion and negative electrode core exposed portion.
  • each of the positive electrode core exposed portion and the negative electrode core exposed portion can be series-welded by one-time welding.
  • it is necessary to take measures such as supplying and taking out the pressure receiver 76 and the metal block for energization inside the U-shaped welding part.
  • electrode core groups 84a and 84b in which the core body 84 of the electrode body 83 is divided into two parts on both sides of the base portion 82 of the current collecting member 81 and converged.
  • the electrode plate core assembly apparatus 80 is shown in which a series spot welding is performed together with a pair of contact plates 85a and 85b disposed outside the electrode core groups 84a and 84b.
  • the core exposed portion of the positive electrode plate or the negative electrode plate is divided into two and is directly series spot welded from both sides of the positive electrode terminal or the negative electrode terminal.
  • the welding surface of the positive electrode terminal or the negative electrode terminal is a flat surface, the welding strength between the positive electrode terminal or the negative electrode terminal and the exposed portion of the positive electrode plate or the core body of the negative electrode plate is increased, and It was difficult to reduce variations in internal resistance.
  • the number of stacked positive electrode core exposed portions and negative electrode core exposed portions is extremely large, and the positive electrode core Aluminum or an aluminum alloy is used as the body and the positive electrode current collector, and copper or a copper alloy is used as the negative electrode core and the negative electrode current collector. Since these aluminum or aluminum alloy, copper or copper alloy is a material having low electrical resistance and good thermal conductivity, between the positive electrode core exposed portion and the positive electrode current collector and the negative electrode core exposed portion A large amount of welding energy is required to reliably weld the negative electrode current collecting member to increase the welding strength and reduce the internal resistance of the welded portion. In addition, if the welding energy is increased during resistance welding, the amount of sputtered dust generated increases, but this dust moves into the electrode body, causing internal short circuits or defective pressure resistance, leading to a decrease in manufacturing yield. become.
  • 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 positive electrode core exposed portion and negative electrode core exposed portion is divided into two.
  • An object of the present invention is to provide a method for manufacturing a prismatic secondary battery that can reduce the resistance of a welded portion and can reduce the amount of spatter generated during resistance welding.
  • a method for manufacturing a prismatic secondary battery according to the present invention includes: a current collecting member corresponding to each of a stacked positive electrode core exposed portion and a negative electrode core exposed portion of a stacked or wound electrode body; A method of manufacturing a prismatic secondary battery having a connected current collecting structure, the step of dividing at least one of the stacked positive electrode core exposed portion and negative electrode core exposed portion into two, Between the core exposed portions, at least one intermediate conductive member having a convex portion formed on the side in contact with the two-divided core exposed portions is disposed, and the outermost core exposed portion on the two split sides is disposed.
  • a current collecting member having a protruding portion on the outer conductive surface on the side of the intermediate conductive member, the protruding portion having a diameter larger than the diameter of the protruding portion provided on the intermediate conductive member, and the protruding portion provided on the intermediate conductive member.
  • the pair of resistance welding electrodes having a resistance welding surface having a diameter larger than the diameter of the protruding portion provided on the current collecting member are pressed from both sides of the laminated core exposed portion, and a part of the protruding portion is A step of performing resistance welding while being in contact with a resistance welding surface of the electrode for resistance welding.
  • the current collecting member on the side of the core body exposed portion divided into two parts of the present invention may be disposed on at least one outermost surface of the core body exposed part divided into two parts. It is preferable to arrange on both outermost surfaces of the body exposed portion. However, even if a current collecting receiving member that is not directly connected to the electrode terminal is disposed on the other outermost surface of the two-divided core exposed portion, the current collecting member is substantially divided into two. The same effect as the case where it arrange
  • the current during resistance welding is the resistance of one resistance Electrode for welding ⁇ one current collecting member ⁇ one of the two exposed core bodies ⁇ one convex part of the intermediate conductive member ⁇ main part of the intermediate conductive member ⁇ the other convex part of the intermediate conductive member ⁇ two splits
  • the other side of the core exposed portion on the formed side ⁇ the other current collecting member ⁇ the other resistance welding electrode so that one current collecting member, one side of the core exposed portion divided into two and the intermediate conductive member Series welding is simultaneously performed between the other convex portion of the intermediate conductive member and the other convex portion of the intermediate conductive member and the other of the two exposed core bodies and the other current collecting member.
  • one current collecting member and the other current collecting member may be integrally formed.
  • the resistance welding electrode since the diameter of the resistance welding surface of the resistance welding electrode (tip surface in contact with the current collecting member) is larger than the diameter of the protruding portion provided on the current collecting member, the resistance welding electrode is connected to the protruding portion of the current collecting member. When abutting from the side opposite to the top, a sealed gap is formed between the tip of the resistance welding electrode and the protruding portion of the current collecting member. On the other hand, at the time of resistance welding, the top portion of the protruding portion of the current collecting member is opposed to the convex portion of the intermediate conductive member with the core body exposed portion on the side divided into two.
  • the projecting portion of the current collecting member and the core exposed portion divided into two parts are deformed toward the distal end side of the resistance welding electrode by the convex portion of the intermediate conductive member.
  • the projecting portion of the deformed current collecting member is in contact with the resistance welding surface of the resistance welding electrode.
  • the air gap formed between the protruding portion of the current collecting member and the tip of the resistance welding electrode remains in a sealed state on the outer peripheral wall side of the protruding portion of the current collecting member, and its volume is small.
  • the contact state between the current collecting member and the resistance welding surface of the resistance welding electrode becomes good, and thus sputtering is less likely to occur.
  • the current collecting member has a smaller heat capacity than the resistance welding electrode, the surface of the current collecting member is hotter during resistance welding, and the current collecting member has a gap between the protruding portion of the current collecting member and the tip of the resistance welding electrode. Since the formed gap is hermetically sealed, the sputtered dust is welded to the inner surface of the protruding portion of the current collecting member rather than the tip of the resistance welding electrode. Further, even if the resistance welding electrode is removed after resistance welding, the sputtered dust remains attached to the surface of the current collecting member and is very unlikely to peel off.
  • the height of the protrusion part provided in the said current collection member as the said current collection member is lower than the height of the convex part provided in the said intermediate conductive member It is preferable to use one.
  • the contact area between the members to be welded increases, the energization path increases accordingly, and heat generation cannot be obtained sufficiently.
  • the relationship between the height of the protruding portion provided on the current collecting member and the height of the convex portion of the intermediate conductive member changes, the convex portion of the intermediate conductive member and the core exposed portion when the pressure is applied with the resistance welding electrode And the contact area of the protrusion part provided in the current collection member changes.
  • the contact area increases as the height of the protrusion provided on the current collecting member increases, and decreases as the height of the protrusion provided on the current collecting member decreases.
  • the laminated core body And the base part of the convex part of the intermediate conductive member is difficult to contact, or even if it is in contact, it is not strongly crimped, so it is difficult to dissipate heat at this part, so heat is easily generated, and resistance welding can be performed in a more stable state .
  • the resistance Since the area of the energization path in the state after being pressurized with the welding electrode can be reduced, resistance welding can be performed in a more stable state.
  • the current collecting member is such that the height of the protruding portion provided on the current collecting member does not exceed the thickness of the current collecting member. It is preferable.
  • the current collector has a height of the protruding portion provided on the current collector that does not exceed the thickness of the current collector, the current collector is nearly flat, so it is divided into two parts. Since the contact state with the exposed core is improved, the quality of the resistance welding portion is improved and the efficiency during resistance welding is improved.
  • the diameter of the top of the protruding portion provided on the current collecting member is 1.5 times the diameter of the convex portion of the intermediate conductive member. It is preferable to use the above.
  • the current collecting member when the diameter of the top portion of the protruding portion provided on the current collecting member is 1.5 times or more the diameter of the convex portion of the intermediate conductive member, the current collecting member is pressed by the resistance welding electrode. Since the center shift at the time of positioning can be absorbed when the projecting portion is deformed, the above-described effect of the present invention is favorably achieved. Further, the upper limit is not critical, but if it is too large, the size of the current collecting member itself increases, so it is preferable that W1 / W2 ⁇ 3.0.
  • the current collecting member includes a dent on the top of the protruding portion provided on the current collecting member that faces away from the intermediate conductive member side. It is preferable to use what is.
  • the top of the protruding part provided on the current collecting member is provided with a dent facing away from the intermediate conductive member side, the back side of the dent of the protruding part formed on the current collecting member during resistance welding Since the portion corresponding to the convex portion of the intermediate conductive member enters, the positioning between the current collecting member and the intermediate conductive member is facilitated, and resistance welding can be performed in a more stable state.
  • the protrusion formed on the current collecting member and the body of the intermediate conductive member in the step of performing resistance welding while pressing with the pair of resistance welding electrodes, the protrusion formed on the current collecting member and the body of the intermediate conductive member (the thickness of one core ⁇ the number of stacked layers) It is preferable to flow a resistance welding current in a larger state.
  • a portion other than the protruding portion provided on the current collecting member, the core exposed portion and the convex portion of the intermediate conductive member, that is, the main body portion in the vicinity of the resistance welded portion, a portion other than the protruding portion provided on the current collecting member, the core exposed portion and the convex portion of the intermediate conductive member, that is, the main body portion. Since there is a gap between them, the projecting portion provided on the current collecting member, the core exposed portion, and the main body portion of the intermediate conductive member do not adhere to each other, and heat dissipation to the main body portion of the intermediate conductive member occurs at this portion. It is difficult and the resistance welding part tends to generate heat intensively.
  • a plurality of intermediate conductive members fixed to an insulating member can be used.
  • a thing of such composition since a plurality of middle conductive members are stably fixed to an insulating member, while being easy to insert a plurality of middle conductive members between the core exposure parts divided into two, Since the positioning can be performed stably, the quality of the resistance welded portion is improved.
  • an insulating member if all the convex parts of at least a plurality of intermediate conductive members are exposed, even if the length of the intermediate conductive member has the same width, it is narrower than that.
  • a prismatic shape, a chamfered prismatic shape, or those in which grooves and gaps are formed to facilitate holding by a holding jig can be used.
  • FIG. 1A is a cross-sectional view of the 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 an IC-IC line in FIG. 1A.
  • 2A is a plan view of the positive electrode intermediate conductive member of Embodiment 1
  • FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A
  • FIG. 2C is a front view.
  • FIG. 3 is a side view showing a welding state of the first embodiment.
  • 4A is a plan view of the resistance welding electrode
  • FIG. 4B is a bottom view of the resistance welding electrode
  • FIG. 4C is a perspective view of a protruding portion formed on the current collecting member
  • FIG. 4D is a pair of resistances.
  • FIG. 4E is an enlarged cross-sectional view showing the arrangement of each part before pressing the welding electrode
  • FIG. 4E is an enlarged cross-sectional view showing the arrangement of each part after pressing the resistance welding electrode.
  • 5A is an enlarged cross-sectional view for explaining a current path at the time of resistance welding according to the first embodiment
  • FIG. 5B is an enlarged cross-sectional view illustrating a spatter generation state at the time of resistance welding according to the first embodiment
  • FIG. FIG. 5D is an enlarged cross-sectional view for explaining a current path at the time of resistance welding in the comparative example
  • FIG. 5D is an enlarged cross-sectional view showing a spatter generation state at the time of resistance welding in the comparative example
  • FIG. It is an expanded sectional view which shows the generation
  • 6A and 6B are cross-sectional views of a current collecting member according to a modification.
  • FIG. 3 is a cross-sectional view corresponding to FIG. 1B in the prismatic secondary battery of Embodiment 2.
  • 8A is a cross-sectional view of an electric double layer capacitor as a conventional power storage element
  • FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8A
  • FIG. 8C is a cross-sectional view taken along line VIIIC-VIIIC in FIG.
  • It is a figure which shows the welding process between the core exposed part of an electrode in FIG. 8, and a current collection member. It is a figure explaining the conventional series spot welding method. It is a figure explaining
  • the electrode body for a rectangular secondary battery that can be used in the present invention was produced by winding or laminating a sheet-like positive electrode plate and a negative electrode plate in a state of being insulated from each other via a separator.
  • a flat electrode body in which a plurality of positive electrode core exposed portions and negative electrode core exposed portions are laminated on both ends will be described as a representative of a wound electrode body.
  • 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 of FIG. 1A
  • FIG. 1C is an IC-IC line of FIG. 1A.
  • This square nonaqueous electrolyte secondary battery 10 has a flat wound electrode body 11 in which a sheet-like positive electrode plate and a negative electrode plate are wound via a separator (both not shown). .
  • the sheet-like positive electrode plate is coated with a positive electrode active material mixture so that a positive electrode core exposed portion 14 in which a strip-shaped aluminum foil is exposed is formed on both surfaces of a positive electrode core made of aluminum foil, and dried. It is produced by rolling later.
  • the sheet-like negative electrode plate is coated with a negative electrode active material mixture so that the negative electrode core exposed portion 15 where the strip-shaped copper foil is exposed is formed on both surfaces of the negative electrode core made of copper foil. It is made by rolling after drying.
  • the flat wound electrode body 11 includes a sheet-like positive electrode plate and negative electrode plate, and a plurality of positive electrode core exposed portions 14 and negative electrode core exposed portions 15 at both ends in the winding axis direction. For example, it is manufactured by winding in a flat shape through a microporous separator made of polyethylene so as to be exposed.
  • 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.
  • the positive electrode terminal 17 and the negative electrode terminal 19 are fixed to the sealing plate 13 via insulating members 20 and 21, respectively.
  • a pressure-sensitive current interrupting mechanism or the like may be interposed between the positive electrode current collecting member 16 and the positive electrode terminal 17 or between the negative electrode current collecting member 18 and the negative electrode terminal 19.
  • the flat wound electrode body 11 manufactured as described above is inserted into the rectangular battery outer can 12, and then the sealing plate 13 is replaced with the battery. Laser welding is performed on the opening of the outer can 12, and then a non-aqueous electrolyte is injected from the electrolyte injection hole 22, and the electrolyte injection hole 22 is sealed.
  • the flat wound electrode body 11 On the side of the positive electrode plate, the flat wound electrode body 11 has a plurality of stacked positive electrode core exposed portions 14 divided into two parts, and an intermediate conductive member 24 for the positive electrode is sandwiched between them.
  • the plurality of stacked negative electrode core exposed portions 15 are divided into two, and the negative electrode intermediate conductive member 25 is sandwiched therebetween.
  • positive current collecting members 16 are disposed on the outermost surfaces on both sides of the positive electrode core exposed portion 14 located on both sides of the positive electrode intermediate conductive member 24, and on both sides of the negative electrode intermediate conductive member 25.
  • Negative electrode current collecting members 18 are respectively disposed on the outermost surfaces of the negative electrode core body exposed portion 15 located on both sides.
  • the positive electrode intermediate conductive member 24 is made of aluminum, which is the same material as the positive electrode core, and the negative electrode intermediate conductive member 25 is made of copper, which is the same material as the negative electrode core, but the positive electrode intermediate conductive member 24 and the negative electrode
  • the intermediate conductive member 25 for use may have substantially the same shape.
  • the positive electrode current collector 16 and the positive electrode core exposed portion 14 and the positive electrode core exposed portion 14 and the positive electrode intermediate conductive member 24 are both resistance welded, and the negative electrode current collector The negative electrode core exposed portion 15 and the negative electrode core exposed portion 15 and the negative electrode intermediate conductive member 25 are both connected by resistance welding.
  • the shape of the positive electrode intermediate conductive member 24 and the negative electrode intermediate conductive member 25 the positive electrode core exposed portion 14, the positive electrode current collecting member 16, the resistance welding method between the positive electrode intermediate conductive member 24, and the negative electrode core exposed
  • a resistance welding method among the portion 15, the negative electrode current collecting member 18, and the negative electrode intermediate conductive member 25 will be described in detail with reference to FIGS.
  • the shape of the positive electrode intermediate conductive member 24 and the negative electrode intermediate conductive member 25 is substantially the same, and the positive electrode core exposed portion 14, the positive electrode current collecting member 16, and the positive electrode intermediate member.
  • the resistance welding method between the conductive members 24 and the negative electrode core exposed portion 15, the negative electrode current collecting member 18, and the negative electrode intermediate conductive member 25 may be the resistance welding method between the positive electrode plate side and the negative electrode plate side. However, since it is the same, the following description will be made on the positive electrode plate side as a representative.
  • the positive electrode intermediate conductive member 24 of Embodiment 1 will be described with reference to FIG. 2A is a plan view of the positive electrode intermediate conductive member 24, FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG. 2A, and FIG. 2C is a front view.
  • a truncated cone-shaped convex portion 24b is formed on each of two opposing surfaces of the cylindrical main body portion 24a.
  • the height of the frustoconical convex portion 24b may be about the same as a projection (projection) generally formed on the resistance welding member, that is, about several mm.
  • the convex portion 24b is not limited to a truncated cone shape, and a polygonal frustum shape such as a triangular frustum shape or a quadrangular frustum shape, or a hemispherical shape can also be used.
  • the diameter and length of the cylindrical main body 24a vary depending on the flat wound electrode body 11 and the battery outer can 12 (see FIG. 1), but may be about 3 mm to several tens of mm.
  • the shape of the body portion 24a of the intermediate conductive member 24 for the positive electrode has been described as a cylindrical shape, but any shape can be used as long as it is a metal block shape such as a prismatic shape or an elliptical columnar shape. can do.
  • a material for forming the positive electrode intermediate conductive member 24 a material made of copper, copper alloy, aluminum, aluminum alloy, tungsten, molybdenum, or the like can be used.
  • An intermediate conductive member 24 for a positive electrode made of copper, copper alloy, aluminum or aluminum alloy is obtained by changing the portion 24b with nickel plating, changing the convex portion 24b and the vicinity thereof to a metal material that promotes heat generation such as tungsten or molybdenum. What is joined to the main body portion 24a by brazing or the like can also be used.
  • a positive electrode core exposed portion 14 made of an aluminum foil of a flat wound electrode body 11 is laminated, and the laminated positive electrode core exposed portion 14 is divided into two on both sides from the winding center portion. Then, the positive electrode core exposed portion 14 was concentrated around a quarter of the electrode body thickness. Then, the positive electrode current collecting member 16 is provided on both sides of the outermost peripheral side of the positive electrode core exposed portion 14, the positive electrode intermediate conductive member 24 is provided on the inner peripheral side, and the truncated cone-shaped convex portions 24 b on both sides of the positive electrode intermediate conductive member 24.
  • 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 flat wound electrode body 11 in which the positive electrode current collecting member 16 and the positive electrode intermediate conductive member 24 are arranged between a pair of resistance welding electrodes 31 arranged vertically is provided.
  • the pair of resistance welding electrodes 31 are respectively brought into contact with the positive electrode current collecting members 16 arranged on both sides of the outermost peripheral side of the positive electrode core exposed portion 14. Then, a pressing force is applied between the pair of resistance welding electrodes 31 at an appropriate pressure, and resistance welding is performed under a predetermined condition.
  • FIG. 4A is a plan view of the resistance welding electrode
  • FIG. 4B is a bottom view of the resistance welding electrode
  • FIG. 4C is a perspective view of a protruding portion formed on the current collecting member
  • FIG. 4E is an enlarged cross-sectional view showing the arrangement of each part before pressing the resistance welding electrode
  • FIG. 4E is an enlarged cross-sectional view showing the arrangement of each part after pressing the resistance welding electrode.
  • the resistance welding electrode 31 is made of, for example, copper, and as shown in FIGS. 4A and 4B, a cylindrical main body 31a and a truncated conical tip that is tapered on the resistance welding surface side of the main body 31a.
  • the end surface of the truncated cone-shaped tip 31b is a resistance welding surface 31c.
  • the positive electrode current collecting member 16 a member having a protruding portion 16a protruding toward the intermediate conductive member 24 side is used as the positive electrode current collecting member 16, a member having a protruding portion 16a protruding toward the intermediate conductive member 24 side is used.
  • the diameter W of the resistance welding surface 31c of the resistance welding electrode 31 is larger than the diameter W1 of the protruding portion 16a of the positive electrode current collecting member 16, as shown in FIG. 4D.
  • the diameter W1 of the protruding portion 16a of the positive electrode current collecting member 16 is larger than the diameter W2 of the convex portion 24b of the positive electrode intermediate conductive member 24.
  • the protrusion 16a of the positive electrode current collecting member 16 is a protrusion having a flat top.
  • the protrusion has a curved or convex shape. May be.
  • the convex portions 24 b on both sides of the positive electrode intermediate conductive member 24 are arranged so as to be in contact with the two divided positive electrode core exposed portions 14. It arrange
  • the resistance welding surface 31c of the resistance welding electrode 31 is disposed so as to close the gap 16b based on the protruding portion 16a of the positive electrode current collecting member 16, the resistance welding electrode 31 on one side in this state, and the positive electrode
  • the arrangement relationship among the current collecting member 16, the two-divided positive electrode core exposed portion 14, and the positive electrode intermediate conductive member 24 is shown in FIG. 4D.
  • a sealed gap 16 b is formed between the protruding portion 16 a of the positive electrode current collecting member 16 and the resistance welding surface 31 c of the resistance welding electrode 31.
  • the positive electrode current collecting member 16 is used such that the height H of the protrusion 16a formed on the positive electrode current collecting member 16 does not exceed the thickness of the positive electrode current collecting member 16, the positive electrode current collecting member 16 is used. Since the electric member 16 is nearly flat, the contact state between the positive electrode current collecting member 16 and the positive electrode core exposed portion 14 divided into two parts becomes good. Further, when the positive electrode current collecting member 16 is used, the height H of the protruding portion 16a formed on the positive electrode current collecting member 16 is lower than the height of the convex portion 24b provided on the positive electrode intermediate conductive member 24. The contact state between the positive electrode current collector 16 and the positive electrode core exposed part 14 divided into two parts and between the divided positive electrode core exposed part 14 and the positive electrode current collector member 16 becomes good. , It becomes difficult for spatter to occur.
  • the positive electrode current collecting member 16 has a smaller heat capacity than the resistance welding electrode 31, the surface of the positive electrode current collecting member 16 becomes hot during resistance welding, and the protruding portion 16 a of the positive electrode current collecting member 16.
  • the gap 16b formed between the resistance welding electrode 31 and the resistance welding surface 31c is in a hermetically sealed state, so that the sputtered dust is less likely to jump out to the outside. It welds to the inner surface of the protrusion part 16a of the current collection member 16 for positive electrodes rather than the resistance welding surface 31c. Note that the sputtered dust remains on the surface of the positive electrode current collecting member 16 even after the resistance welding electrode 31 is removed after resistance welding, so that it is very unlikely to peel off.
  • the protrusions 16a formed on the positive electrode current collecting member 16 and the protrusions of the positive electrode intermediate conductive member 24 are formed. Stacked positive electrode cores that exist between the projecting portion 16a formed on the positive electrode current collecting member 16 and the positive electrode intermediate conductive member 24 at a distance L between the portion other than the portion 24b, that is, the main body portion 24a. It is preferable to flow the resistance welding current in a state where it is larger than the total thickness of the exposed portion 14 (thickness of one core body ⁇ number of stacked layers) L2.
  • FIG. 5A is an enlarged cross-sectional view for explaining a current path at the time of resistance welding according to the first embodiment
  • FIG. 5B is an enlarged cross-sectional view showing a spatter generation state at the time of resistance welding according to the first embodiment
  • 5C is an enlarged cross-sectional view for explaining a current path at the time of resistance welding in the comparative example
  • FIG. 5D is an enlarged cross-sectional view showing a spatter generation state at the time of resistance welding in the comparative example
  • FIG. 5E is another comparison. It is an expanded sectional view which shows the generation
  • the current path at the time of resistance welding according to the first embodiment is such that when a pressing force is applied between the pair of resistance welding electrodes 31 at an appropriate pressure, the protruding portion of the positive electrode current collecting member 16
  • the bottom surface of 16a contacts the resistance welding surface 31c of the resistance welding electrode 31, and at the same time, between the resistance welding surface 31c of the resistance welding electrode 31 and the outer peripheral wall side of the protruding portion 16a of the positive electrode current collecting member 16
  • the air gap 16b is formed in a sealed state.
  • Sputtering is less likely to occur than in the comparative example shown in FIGS. 5C and 5D, and even if spattering occurs, this spattering is caused by the protruding portion of the positive current collecting member 16 as shown in FIG. 5B. It comes to stop in the space
  • the shape of the protruding portion 16a of the positive electrode current collecting member 16 is hemispherical, and a portion of the protruding portion 16a is not in contact with the resistance welding surface 31c of the resistance welding electrode 16 but is in resistance.
  • sputtering easily occurs between the protruding portion 16a and the positive electrode core exposed portion 14.
  • the shape of the protruding portion 16a is a hemispherical shape, a displacement is likely to occur when a pressing force is applied to the pair of resistance welding electrodes 31, and a part of the protruding portion 16a is resistance-welded to the resistance welding electrode 16. Since it is difficult to be deformed into a state in contact with the surface 31c, the shape of the protrusion is preferably a shape having a flat top as shown in FIG. 4D or a shape having a slightly flat substantially top.
  • tip part 31b was shown as the electrode 31 for resistance welding.
  • a polygonal columnar shape can be used as the main body portion 31a of the resistance welding electrode 31, and a polygonal frustum shape can also be used as the tip portion 31b.
  • the example using the thing by which the truncated cone-shaped convex part 24b was formed in the both end surfaces of the column-shaped main-body part 24a was shown as the intermediate conductive member 24 for positive electrodes.
  • the protruding portion 16 a formed on the positive electrode current collecting member 16 and the main body portion 24 a of the positive electrode intermediate conductive member 24 Is greater than the total thickness L2 of the stacked positive electrode core exposed portions 14 existing between the protruding portion 16a formed on the positive electrode current collecting member 16 and the intermediate conductive member 24 for positive electrode.
  • An example in which resistance welding was performed in a state was shown. This is because the positive electrode current collector member 16 is such that the height of the protruding portion 16a formed on the positive electrode current collector member 16 is lower than the height of the convex portion 24b provided on the positive electrode intermediate conductive member 24. It shows that
  • the height of the protruding portion 16a formed on the positive electrode current collecting member 16 is low, the stacked positive electrode core exposed portion 14 and the main body portion 24a of the positive electrode intermediate conductive member 24 are difficult to contact, Alternatively, even if it is in contact, it is not strongly pressure-bonded, so it is difficult to radiate heat at this portion, so heat is easily generated, and resistance welding can be performed in a stable state.
  • the diameter W1 of the top part of the protrusion part 16a formed in the positive electrode current collection member 16 as the positive electrode current collection member 16 and the diameter W2 of the convex part 24b of the positive electrode intermediate conductive member 24 both refer to FIG. 4D. If a relationship of W1 / W2 ⁇ 1.5 is used, the center misalignment at the time of positioning can be absorbed when the protruding portion 24a of the positive electrode current collecting member 24 is deformed by pressing by the pair of resistance welding electrodes 31. As a result, the quality of the resistance weld is stabilized. Further, the upper limit of W1 / W2 is not critical, but if it is too large, the size of the current collecting member itself is also increased, so W1 / W2 ⁇ 3.0 is preferable.
  • the case where the plurality of stacked positive electrode core exposed portions 14 are divided into two parts and resistance welding is performed using the positive electrode current collecting member 16 and the positive electrode intermediate conductive member 24 is described.
  • the intermediate conductive member for positive electrode 24 may be used as the current collecting member 16 for positive electrode, and the intermediate conductive member for positive electrode 24 may be connected to the positive electrode terminal 17.
  • a weld receiving member made of a thin plate formed of the same material as the positive electrode intermediate conductive member 24 may be used instead of the positive electrode current collecting member used in the first embodiment.
  • the positive electrode current collecting member 16 of the first embodiment is an example in which the surface is formed with a flat protrusion 16a.
  • FIG. 6A and FIG. As shown in FIG. 6, a recess 16c may be formed on the bottom of the protrusion 16a at a position facing the protrusion 31c of the resistance welding electrode 31.
  • the one having such a recess 16c is used, it corresponds to the protrusion 24b of the intermediate conductive member 24 for positive electrode on the back side of the recess 16c of the protrusion 16a formed on the current collector 16 for positive electrode during resistance welding. Therefore, the positioning between the positive electrode current collecting member 16 and the positive electrode intermediate conductive member 24 is facilitated.
  • FIG. 7 is a cross-sectional view corresponding to FIG. 1B in the prismatic secondary battery according to the second embodiment.
  • the positive electrode intermediate conductive member 24 used in Embodiment 2 is the same as the positive electrode intermediate conductive member 24 of Embodiment 1, but is fixed to an insulating member 27 made of, for example, a heat-resistant resin material.
  • an insulating member 27 having two positive intermediate conductive members 24 fixed thereto is used, the two positive intermediate conductive members 24 are stably fixed to the insulating member 27. Since the positive electrode intermediate conductive member 24 can be easily inserted between the two divided positive electrode core exposed portions 14 and can be stably positioned, the quality of the resistance welded portion is improved.
  • the positive electrode intermediate conductive member 24 may have the same width. Narrower widths may be used, and prismatic and chamfered prismatic shapes, and those formed with grooves and gaps for easy holding by a holding jig may be used. it can.
  • the number of the positive electrode intermediate conductive members 24 may be three or more according to the capacity of the rectangular secondary battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention a pour objectif de produire un procédé de fabrication d'une batterie secondaire rectangulaire très fiable, un élément conducteur intermédiaire étant disposé entre des parties exposées de corps de noyau empilées obtenues en étant divisées en deux et même si de la poussière est projetée entre un élément collecteur et une électrode de soudage pendant le soudage par résistance, la poussière est rarement libérée à l'extérieur. Pour ce faire, elle propose de diviser une partie exposée de corps de noyau d'électrode positive (14) et d'une partie exposée de corps de noyau d'électrode négative en deux groupes et au moins un élément conducteur intermédiaire (24) ayant des protubérances formées dessus est disposé entre les deux groupes. Un élément collecteur (16) comportant des saillies en saillie vers le côté de l'organe conducteur intermédiaire (24) est disposé de sorte que les saillies se trouvent en regard des protubérances agencées sur l'élément conducteur intermédiaire (24), la partie exposée de corps de noyau (14) étant intercalée entre ces derniers. La partie exposée de corps de noyau (14) est pressée à partir de ses deux côtés par une paire d'électrodes de soudage par résistance (31) ayant chacune une face de soudage par résistance présentant un diamètre plus grand que le diamètre des saillies agencées sur l'élément collecteur (16), et le soudage par résistance est réalisé alors que des parties des saillies sont en contact avec les faces de soudage par résistance des électrodes de soudage par résistance.
PCT/JP2012/057779 2011-03-31 2012-03-26 Procédé de fabrication d'une batterie secondaire rectangulaire WO2012133329A1 (fr)

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WO2014021065A1 (fr) * 2012-07-30 2014-02-06 トヨタ自動車株式会社 Pile rechargeable et procédé de fabrication de pile rechargeable
JP2014203780A (ja) * 2013-04-09 2014-10-27 トヨタ自動車株式会社 電池の製造方法及び電池
CN108666630A (zh) * 2017-03-27 2018-10-16 三洋电机株式会社 方形二次电池的制造方法
JP2021093307A (ja) * 2019-12-11 2021-06-17 トヨタ自動車株式会社 二次電池の製造方法
CN114258597A (zh) * 2019-09-30 2022-03-29 三洋电机株式会社 二次电池的制造方法、以及二次电池

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WO2017057323A1 (fr) * 2015-09-28 2017-04-06 株式会社Ｇｓユアサ Élément de stockage d'électricité, procédé de fabrication d'élément de stockage d'électricité, collecteur de courant et élément de recouvrement

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WO2014021065A1 (fr) * 2012-07-30 2014-02-06 トヨタ自動車株式会社 Pile rechargeable et procédé de fabrication de pile rechargeable
JP2014203780A (ja) * 2013-04-09 2014-10-27 トヨタ自動車株式会社 電池の製造方法及び電池
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CN108666630B (zh) * 2017-03-27 2023-03-24 三洋电机株式会社 方形二次电池的制造方法
CN114258597A (zh) * 2019-09-30 2022-03-29 三洋电机株式会社 二次电池的制造方法、以及二次电池
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JP2021093307A (ja) * 2019-12-11 2021-06-17 トヨタ自動車株式会社 二次電池の製造方法
JP7240612B2 (ja) 2019-12-11 2023-03-16 トヨタ自動車株式会社 二次電池の製造方法

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