WO2018008632A1 - Procédé de fabrication d'une cellule - Google Patents

Procédé de fabrication d'une cellule Download PDF

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Publication number
WO2018008632A1
WO2018008632A1 PCT/JP2017/024480 JP2017024480W WO2018008632A1 WO 2018008632 A1 WO2018008632 A1 WO 2018008632A1 JP 2017024480 W JP2017024480 W JP 2017024480W WO 2018008632 A1 WO2018008632 A1 WO 2018008632A1
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WIPO (PCT)
Prior art keywords
electrode plate
separator
region
contact
separator region
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PCT/JP2017/024480
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English (en)
Japanese (ja)
Inventor
良太 有友
齋藤　光央
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三洋電機株式会社
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Publication of WO2018008632A1 publication Critical patent/WO2018008632A1/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
    • 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 disclosure relates to a method for manufacturing a battery.
  • a battery including a positive electrode plate, a negative electrode plate, and a separator, and including an electrode body in which the positive electrode plate and the negative electrode plate are laminated via the separator is widely known.
  • Such an electrode body has an advantage that a dead space is reduced as compared with a wound electrode body formed by winding a positive electrode and a negative electrode.
  • the electrode body since the positive electrode is not bent and the positive electrode active material layer is not cracked like the wound electrode body, the electrode body has a higher packing density of the positive electrode active material in the positive electrode active material layer. The energy density can be improved as compared with the wound electrode body.
  • Patent Document 1 discloses a non-aqueous secondary in which a separator is folded back in a bellows shape and has a stopper to which the folded-back separator is bonded, and a positive electrode plate and a negative electrode plate are alternately opposed via the separator. A battery is described.
  • Patent Document 2 discloses that a belt-like separator is folded on a table via a zigzag folding mechanism, and each time the separator is folded by zigzag folding, the positive electrode plate and the negative electrode plate are placed on the folded separator.
  • a battery manufacturing method is described which includes a step of alternately supplying positive and negative electrodes on a table while supplying separators alternately through a mechanism and interposing a separator.
  • a battery including an electrode body in which a positive electrode plate and a negative electrode plate are stacked with a separator interposed therebetween, it is strongly required that the stacking deviation between the positive electrode plate and the negative electrode plate is suppressed. This is because when the non-facing portion of the positive electrode plate with the negative electrode plate is formed due to misalignment, the charge / discharge characteristics of the battery deteriorate significantly. Therefore, when producing an electrode body by laminating a positive electrode plate and a negative electrode plate via a separator, a construction method is required in which the positive electrode plate and the negative electrode plate are laminated at predetermined positions on the separator without misalignment. Yes.
  • the battery manufacturing method includes a first step of placing a first separator region having a first adhesive layer on at least one surface, and a first separator region opposite to the first surface and the first surface.
  • the method for manufacturing a battery according to the present disclosure in the stacking process of the electrode plate and the separator region, it is possible to suppress the stacking deviation of the stacked electrode plate and the separator region, and thereby the stacking shift of the electrode body in the battery. Can be further controlled from its manufacture through its use period.
  • the inventors of the present disclosure have disclosed a method for manufacturing a battery in which the method for manufacturing a battery according to the present disclosure takes measures to suppress the stacking deviation between the stacked electrode plate and the separator region while stacking the electrode plate and the separator region. It has been found that electrode stacking deviation in the stage can be suppressed.
  • FIG. 1 is a schematic view of a battery 3 which is an example of the present embodiment.
  • the battery 3 includes an exterior body 4 and a power generation element accommodated in the exterior body 4.
  • a suitable example of the battery 3 is a lithium ion secondary battery which is a nonaqueous electrolyte secondary battery.
  • the power generation element includes, for example, an electrode body 20 and a nonaqueous electrolyte (not shown).
  • the z-axis is defined in the stacking direction of the electrode body 20
  • the x-axis is defined in the direction along the side where the positive electrode terminal 7 and the negative electrode terminal 9 of the exterior body 4 are provided
  • the y axis is defined in a direction orthogonal to each of the x axis and the z axis.
  • the exterior body 4 has a bottomed rectangular tube shape as shown in FIG. 1, for example, and the opening of the exterior body 4 is sealed by a sealing plate 5.
  • the electrode body 20 is inserted into the exterior body 4 while being covered with the insulating sheet 17.
  • the exterior body that houses the power generation element is not limited to the bottomed rectangular tubular exterior body 4 shown in FIG. 1, and may be formed of a laminate film or the like.
  • the sealing plate 5 has a positive terminal mounting hole 5a and a negative terminal mounting hole 5b.
  • the insulating member 10 and the positive electrode current collector 6 are disposed around the positive electrode terminal mounting hole 5a and inside the battery. Further, the insulating member 11 is disposed around the positive terminal mounting hole 5a and outside the battery. Then, the positive electrode terminal 7 is inserted into the through hole provided in each of the insulating member 11, the insulating member 10, and the positive electrode current collector 6 from the outside of the battery, and the tip of the positive electrode terminal 7 is caulked and fixed to the positive electrode current collector 6. To do.
  • the caulked portion of the positive electrode terminal 7 is preferably welded to the positive electrode current collector 6.
  • the insulating member 12 and the negative electrode current collector 8 are disposed around the negative electrode terminal mounting hole 5b and inside the battery. Further, an insulating member 13 is disposed around the negative electrode terminal mounting hole 5b and outside the battery. Then, the negative electrode terminal 9 is inserted into the through hole provided in each of the insulating member 13, the insulating member 12, and the negative electrode current collector 8 from the outside of the battery, and the tip of the negative electrode terminal 9 is caulked and fixed to the negative electrode current collector 8. To do.
  • the caulked portion of the negative electrode terminal 9 is preferably welded to the negative electrode current collector 8.
  • the positive electrode tab portion 1 on which the electrode body 20 is laminated is welded to the positive electrode current collector 6, and the negative electrode tab portion 2 on which the electrode body 20 is laminated is welded to the negative electrode current collector 8.
  • welding connection resistance welding, laser welding, ultrasonic welding, or the like can be used.
  • the electrode body 20 covered with the insulating sheet 17 is inserted into the bottomed rectangular tube-shaped exterior body 4. Thereafter, the exterior body 4 and the sealing plate 5 are connected by welding to seal the opening of the exterior body 4. Thereafter, a nonaqueous electrolytic solution containing an electrolyte and a solvent is injected from an electrolytic solution injection hole 15 provided in the sealing plate 5. Thereafter, the electrolyte injection hole 15 is sealed with a sealing plug 16.
  • the sealing plate 5 is provided with a gas discharge valve 14 that is broken when the pressure inside the battery becomes a predetermined value or more and discharges the gas inside the battery to the outside.
  • a current interruption mechanism can be provided in the conductive path between the positive electrode plate 30 and the positive electrode terminal 7 or in the conductive path between the negative electrode plate 40 and the negative electrode terminal 9.
  • the current interrupting mechanism is preferably one that operates when the internal pressure of the battery becomes a predetermined value or more and cuts the conductive path. Note that the operating pressure of the current interrupt mechanism is set lower than the operating pressure of the gas discharge valve.
  • FIG. 2 is a schematic diagram of an example of the electrode body 20 including the positive electrode plate 30, the negative electrode plate 40, and the separator region 60 disposed between the positive electrode plate 30 and the negative electrode plate 40.
  • the separator region 60 in the electrode body 20 shown in FIG. 3 is a so-called single wafer separator in which the separator regions 60 are separated from each other and independent.
  • the number of positive plates 30 and negative plates 40 in the electrode body 20 is not particularly limited.
  • the electrode body 20 includes a plurality of positive plates 30 and a plurality of negative plates 40 laminated between the positive plate 30 and the negative plate 40 with separator regions 60 interposed therebetween.
  • the multilayer electrode body 20 may be a single-layer electrode body 20 formed by laminating a single positive electrode plate 30 and a single negative electrode plate 40 with a separator region 60 interposed therebetween. It may be.
  • the positive electrode plate 30 has a rectangular region in which a positive electrode active material layer (not shown) is formed on both surfaces of the positive electrode core, and the positive electrode plate 30 has one end of one side in the rectangular region.
  • the positive electrode lead 32 is provided in the part.
  • a protective layer having an electric resistance higher than that of the insulating layer or the positive electrode core may be provided at the root portion where the positive electrode lead 32 and the square region where the positive electrode active material layer is formed are in contact with each other.
  • the negative electrode plate 40 has a rectangular region in which a negative electrode active material layer is formed on both surfaces of the negative electrode core, and the negative electrode plate 40 is provided with a positive electrode lead 32 on one side in the rectangular region.
  • a negative electrode lead 42 is provided at an end portion different from the end portion.
  • FIG. 3 is a schematic diagram of another example of the electrode body 20.
  • the plurality of separator regions 60 arranged between the positive electrode plate 30 and the negative electrode plate 40 constitute one strip separator 70.
  • the strip-shaped separator 70 including a plurality of separator regions 60 is folded in accordance with the size of the positive electrode plate 30 or the negative electrode plate 40, forms the separator region 60 in a region other than the folded region, and is folded back.
  • This is a so-called zigzag type separator in which two separator regions 60 sandwiching the region are configured to sandwich the positive electrode plate 30 or the negative electrode plate 40.
  • the electrode body 20 is manufactured by laminating the electrode plate 50 and the separator region 60 with the separator region 60 interposed between the electrode plates 50.
  • electrode plate in this specification, it means that it is any one of the positive electrode plate 30 and the negative electrode plate 40, and the positive electrode plate 30 and the negative electrode plate 40, or the 1st electrode mentioned later This means that there is no need to distinguish between the plate 51 and the second electrode plate 52. Even in that case, of course, when the electrode body 20 is manufactured, the positive electrode plates 30 and the negative electrode plates 40 are alternately stacked via the separator regions 60.
  • FIG. 5 shows an example of a conventional method of laminating the electrode plate 50 and the separator region 60 in producing the electrode body 20.
  • the separator region 60 is placed on the stacking table 80 (FIG. 5A), and the electrode plate 50 is stacked on the placed separator region 60 (FIG. 5B).
  • a new separator region 60 is laminated on the electrode plate 50 (FIG. 5C), and an electrode plate 50 having a polarity opposite to that of the already laminated electrode plate 50 is laminated on the laminated separator region 60 ( 5D), the electrode body 20 in which the plurality of electrode plates 50 and the separator region 60 are stacked is manufactured.
  • the same electrode plate 50 and separator region 60 lamination process is repeated.
  • FIG. 4 shows an example of a method for stacking the electrode plate 50 and the separator region 60 in the method for manufacturing the battery 3 according to this embodiment.
  • a step (first step) of placing the first separator region 61 having the first adhesive layer 611 on at least one surface is performed ((( a))
  • a step (second step) is performed in which the first electrode plate 51 is laminated on the first separator region 61 so that the first adhesive layer 611 of the first separator region 61 and the first electrode plate 51 are in contact with each other.
  • the step (third step) of laminating the second separator region 62 on the first electrode plate 51 is performed ((d) of FIG. 4), and the first separator region 62 is subjected to the first step.
  • a step (fourth step) of laminating a second electrode plate 52 having a polarity opposite to that of the electrode plate 51 is performed ((e) of FIG. 4).
  • a step of adhering the first surface of the first electrode plate 51 and the first adhesive layer 611 of the first separator region 61 is performed (adhesion step) ( (C) of FIG.
  • adheresion step (C) of FIG.
  • a step of bonding the first surface and the first adhesive layer 611 a step of heating the first electrode plate 51 (first heating step) and a stacked first electrode plate
  • a step of pressurizing 51 toward the first separator region 61 is performed.
  • the arrow in FIG. 4C indicates the direction of pressurization of the pressing member 82 that contacts the first electrode plate 51 and is used to pressurize the first electrode plate 51.
  • the separator region 60 and the electrode plate 50 are bonded, and the separator region 60 and the electrode plate 50 are temporarily fixed.
  • the stacking deviation in the manufacturing stage of the electrode body 20 can be suppressed by temporarily fixing the separator region 60 and the electrode plate 50.
  • a first step (placement step) for placing the first separator region 61 is performed.
  • a first adhesive layer 611 is provided on at least one surface of the first separator region 61 placed in the first step.
  • the first separator region 61 is placed so that the first electrode plate 51 and the first adhesive layer 611 stacked in the subsequent second step are in contact with each other.
  • the separator region and the electrode plate 50 are stacked or placed on a stacking table 80 made of a support member such as a flat table.
  • a second step (first electrode plate stacking step) is performed in which the first electrode plate 51 is transported and the first electrode plate 51 is stacked on the placed first separator region 61.
  • first electrode plate 51 a surface in contact with the first separator region 61 is a first surface, and a surface opposite to the first surface is a second surface.
  • the first electrode plate 51 stacked in the first separator region 61 may be either the positive electrode plate 30 or the negative electrode plate 40.
  • the negative electrode plate is a first electrode plate.
  • the first electrode plate 51 is transported from the storage unit that stores the electrode plate 50 to the stacking table 80 where stacking is performed using a known transporter.
  • a transporter that supports the first electrode plate 51.
  • Examples of such a transporter include a suction method and an electrostatic method.
  • Examples of the suction method include a method using a suction pad and a method in which an infinite number of holes are formed in a thickness direction in a plate material, and the plate material is brought into contact with the plate material while sucking from the innumerable holes.
  • a method using a plate material is preferable because it is easy to suppress uneven distribution of adsorption stress during adsorption.
  • the transporter and the storage unit may include a heat source that can heat the electrode plate 50.
  • Adhesion step Prior to the third step, a step of adhering the first surface of the first electrode plate 51 and the first adhesive layer 611 of the first separator region 61 (adhesion step) is performed.
  • adheredhering the surface of the electrode plate and the adhesive layer means, for example, adhesion of the region by applying heat, pressure or the like in at least a partial region of the interface between the surface of the electrode plate and the adhesive layer.
  • the component contained in the layer means that the surface of the electrode plate is mechanically, physically or chemically joined.
  • the first electrode plate 51 and the first separator region 61 are bonded, and the first electrode plate 51 and the first separator region 61 are temporarily fixed.
  • temporary fastened between the first electrode plate 51 and the first separator region 61 means that the mechanical, physical, or chemical between the first electrode plate 51 and the first adhesive layer 611 in the first separator region 61 is used. This means that the relative displacement in the direction parallel to the contact surface between the first electrode plate 51 and the first separator region 61 is limited by the effective bonding.
  • the first electrode plate 51 and the first separator region 61 may be bonded to each other as long as the relative displacement between the first electrode plate 51 and the first separator region 61 is limited. It is not essential until the reaction of the components is complete and adhesion is complete.
  • the step of bonding the first surface of the first electrode plate 51 and the first adhesive layer 611 of the first separator region 61 is at least a heating step and a pressing step described later. It is preferable to have one, and it is more preferable to have both a heating step and a pressure step. This is because the temporary fixing between the first electrode plate 51 and the first separator region 61 becomes stronger by performing the heating step and the pressing step as the bonding step.
  • a first heating step (also simply referred to as “heating step”) for heating the first electrode plate 51 is performed.
  • the heating step is performed before the third step of laminating the second separator region 62 on the first electrode plate 51, and is brought into contact with the heated first electrode plate 51, thereby There is no particular limitation as long as sufficient heat can be supplied to the first adhesive layer 611.
  • the heating step can be performed before the second step, and can be performed simultaneously with or after the second step.
  • the first electrode plate 51 is heated by laminating the preheated first electrode plate 51 on the first separator region 61 or when the first electrode plate 51 is laminated on the first separator region 61. As a result, heat is supplied to the first adhesive layer 611 provided on the surface of the first separator region 61, and used for bonding the first electrode plate 51 and the first separator region 61.
  • a method of heating the first electrode plate 51 while it is being transported and / or stored can be cited.
  • the transporter that transports the first electrode plate 51 while supporting the first electrode plate 51 can be heated while transporting the first electrode plate 51 by including a heat source that heats the first electrode plate 51.
  • the storage unit that stores the first electrode plate 51 includes a heat source, the storage unit stores the first electrode plate 51 and heats the first electrode plate 51 until it is transported. it can.
  • the heat source used for heating the first electrode plate 51 may be a known heat source capable of heating the electrode plate 50.
  • a contact heat source such as a cartridge heater or a rubber heater, a furnace, or a heater
  • non-contact heat sources such as electromagnetic wave (for example, infrared rays) irradiation means.
  • the transport device or the pressing member 82 includes a contact-type heat source so that the first electrode plate 51 is transported or the pressing member 82 is in contact with the first electrode plate 51.
  • One electrode plate 51 can be heated.
  • the non-contact type heat source can be used as a heat source provided in the storage unit, and is provided in the transport path of the first electrode plate 51 by the transport device, so that the first electrode plate 51 is transported while the first electrode plate 51 is transported. 51 can be heated.
  • the region of the first electrode plate 51 heated by the heating step can supply sufficient heat to the first adhesive layer 611 of the first separator region 61, it is at least part of the first electrode plate 51.
  • the first electrode plate 51 may be heated entirely (for example, by a furnace or the like).
  • each adhesive layer is made uniform with the electrode plate 50 by heating and pressing the electrode body 20 so that the adhesive layer in each separator region 60 is completely adhered. It can be made the state adhered to.
  • a first pressurizing step (simply referred to as “pressurizing step”) for pressurizing the first electrode plate 51 toward the first separator region 61 is performed.
  • the pressurizing step is performed after the second step and before the third step.
  • the first adhesive layer 611 on the surface of the first separator region 61 in contact with the first electrode plate 51 receives the pressure to bond the first electrode plate 51 and the first separator region 61 together.
  • the pressure applied toward the first separator region 61 in the pressurizing step is not particularly limited as long as it is a pressure that contributes to the adhesion between the first electrode plate 51 and the first adhesive layer 611.
  • the pressure is 0.5 MPa or more and 20 MPa or less. It is.
  • “Pressurizing the first electrode plate 51 toward the first separator region 61” in the pressurizing step applies a force to at least a part of the first electrode plate 51, and the first electrode plate 51 and the first separator. It means that the pressure of the component perpendicular to the contact surface with the region 61, that is, the component along the stacking direction of the first electrode plate 51 and the first separator region 61 is generated.
  • the first electrode plate 51 may be displaced toward the first separator region 61 and heads toward the first separator region 61 as long as pressure of a component perpendicular to the contact surface is generated. The displacement may not actually occur.
  • the pressing member 82 is brought into contact with the second surface of the first electrode plate 51, and the pressing member 82 is moved to the first step.
  • a method of displacing the electrode plate 51 in the direction perpendicular to the contact surface between the first electrode plate 51 and the first separator region 61 is exemplified. At this time, only the pressing member 82 may be displaced, or in the first step, the supporting member on which the first separator region 61 is placed is simultaneously displaced toward the pressing member 82, so that the first electrode plate 51 is You may pressurize toward 1 separator area
  • the pressurizing step as another method of pressurizing the first electrode plate 51 toward the first separator region 61, for example, after laminating the first electrode plate 51 on the first separator region 61 using a transporter, for example, a method of pressing the first electrode plate 51 and the first separator region 61 by pressing the transport device as it is toward the first separator region 61 may be used.
  • the pressing member 82 for example, a holding member used in a holding step to be described later, a transport machine used for stacking the first electrode plate 51 on the first separator region 61 may be used as the pressing member 82.
  • a member having a pressing mechanism independent of these members may be used as the pressing member 82.
  • the first electrode plate 51 can be pressed toward the first separator region 61 with a stress higher than that of the holding member.
  • a holding step (first electrode plate holding step) in which the holding member is brought into contact with the second surface of the first electrode plate 51 can be performed.
  • the holding step it is possible to suppress the stacking deviation until the first electrode plate 51 and the first separator region 61 are temporarily fixed.
  • the place where the holding member is brought into contact with the two surfaces is a place where the transfer machine is not in contact.
  • the holding member can be brought into contact with the stacking table 80 from the state in which the transporter is in contact with the first electrode plate 51, and when the transporter leaves the first electrode plate 51 after the second step, However, it becomes difficult to prevent the transfer machine from moving.
  • the pressurizing step for pressurizing the first electrode plate 51 can be performed by using the holding member as the pressing member 82.
  • the manufacturing apparatus used for the lamination can be simplified.
  • the first electrode plate 51 and the first electrode plate 51 are longest between the time when the first separator region 61 and the first electrode plate 51 contact each other and the time when the second separator region 62 is stacked on the first electrode plate 51. Can abut. Therefore, the pressure can be easily transmitted to the first separator region 61 via the first electrode plate 51 and bonded.
  • the heating step of heating the first electrode plate 51 can be performed by bringing the holding member including the heat source into contact with the second surface of the first electrode plate 51.
  • a manufacturing apparatus used for stacking can be simplified by performing a heating step by bringing a holding member including a heat source into contact with the first electrode plate 51.
  • the first electrode plate 51 and the first electrode plate 51 are longest between the time when the first separator region 61 and the first electrode plate 51 contact each other and the time when the second separator region 62 is stacked on the first electrode plate 51. Can abut. Therefore, heat can be easily transferred to the first separator region 61 via the first electrode plate 51 and bonded. Even when the holding member is provided with a heat source, the first electrode plate 51 may be heated in advance in a storage unit or the like.
  • the holding member moves from a state of contacting the surface of the first electrode plate 51. Leave. Therefore, the stacking deviation when the holding member is separated from the first electrode plate 51 can be remarkably suppressed.
  • the temperature of the first electrode plate 51 is higher than the temperature of the first separator region 61. It is preferable to heat so that it may become high.
  • the temperature of the first separator region 61 becomes higher than the temperature of the first electrode plate 51, when an adhesive layer is formed on the surface of the first separator region 61 facing the stacking table 80, the stacking table 80 and the first separator region This is because the possibility of bonding with 61 increases.
  • a third step (second separator region stacking step) of stacking the second separator region 62 on the first electrode plate 51 is performed.
  • a fourth step which will be described later, following the third step, a second adhesive layer 622 is provided on the surface of the second separator region 62 that does not contact the first electrode plate 51.
  • the second separator region 62 may have a third adhesive layer 623 on the surface in contact with the first electrode plate 51.
  • the second separator region 62 is a so-called single-wafer type separator that is independent of the first separator region 61 placed in the first step, the second separator region 62 is placed on the stacking table 80 by a known transporter. Be transported.
  • the second separator region 62 constitutes a part of one strip separator 70 together with the first separator region 61 placed in the first step, in the third step, in the region adjacent to the first separator region 61.
  • the second separator region 62 is stacked on the first electrode plate 51 by folding the strip separator 70.
  • the strip separator 70 is folded in a region adjacent to the first separator region 61 of the strip separator 70 in the third step, and the folded strip separator 70 is folded.
  • a region including a portion in contact with the first electrode plate 51 is a second separator region 62.
  • region 62 comprise a part of strip
  • region. 62 is different from the surface on which the second adhesive layer 622 is provided.
  • the strip separator 70 preferably has adhesive layers on both surfaces. In this case, one surface has a first adhesive layer 611 and the other surface has a second adhesive layer 622.
  • the holding member used for the holding step is the surface of the strip separator 70 on the surface of the first electrode plate 51 on the second separator region 62 side.
  • the belt-like separator 70 may be folded back in contact with the end portion on the side where the folding is performed.
  • the holding member holds the first electrode plate 51 serving as a turning point when the strip-shaped separator 70 is turned back, whereby the stacking deviation in the third step can be suppressed.
  • these steps may be repeated according to the second step, the heating step, the pressurizing step, and the third step described above.
  • the holding step may be performed.
  • the fourth step in which the second electrode plate 52 having the opposite polarity to the first electrode plate 51 is stacked on the second separator region 62 stacked in the third step is the second step. It can be performed according to two steps.
  • a surface in contact with the second adhesive layer 622 provided on the surface of the second separator region 62 is defined as a third surface
  • a surface opposite to the third surface is defined as a fourth surface.
  • attachment step which adhere
  • the 2nd heating step which heats the 2nd electrode plate 52
  • the 2nd pressurization step which pressurizes the 2nd electrode plate 52 performed according to the said pressurization step.
  • region 62 can be temporarily fixed.
  • the third adhesive layer 623 is provided on the surface of the second separator region 62 in contact with the first electrode plate 51, the first electrode plate 51 and the second electrode are simultaneously fixed with the second electrode plate 52 and the second separator region 62. Temporary fixing with the separator region 62 can also be performed. Since the first electrode plate 51 is heated by the first heating step, when the second separator region 62 is laminated on the first electrode plate 51 by the separator region lamination step, the third adhesive layer 623 becomes the first electrode plate 51. Can receive heat from. In addition, the third adhesive layer 623 can receive pressure by pressing the second electrode plate 52 toward the second separator region 62 in the second pressurizing step through the fourth step. Thereby, the adjacent 1st electrode plate 51 and the 2nd separator area
  • the electrode body 20 in which the electrode plate 50 and the separator region 60 are stacked is heated by pressing the entire electrode body 20 and pressurizing in the stacking direction after the stacking process of the electrode plate 50 and the separator region 60 is completed. Adhesion with the electrode plate 50 adjacent to the adhesive layer is completed. Thereby, not only the manufacturing stage of the battery 3 but also the stacking deviation between the electrode plate 50 and the separator region 60 in shipping and use of the manufactured battery 3 can be further suppressed.
  • the produced electrode body 20 may be constrained by a known means such as an insulating tape or a covering material.
  • the method of bringing the pair of pressing members 82 into contact with the first electrode plate 51 to bond the first separator region 61 and the first electrode plate 51 is described. It is not limited to this method.
  • the pressing member 82 may be brought into contact with only one end of the electrode plate 50.
  • the pressing member 82 (for example, a holding member) can be used as a starting point for folding the separator region 60.
  • the pressing member 82 in the first electrode plate 51 comes into contact after the second electrode plate 52 is laminated. At the end opposite to the one end, the pressing member 82 is brought into contact and pressurized.
  • the first electrode plate 51 and the second electrode plate 52 are formed at the ends opposite to each other by temporary fixing.
  • the electrode plate 50 and the separator region 60 can be stacked using this method.
  • the pressing member 82 used to press the first electrode plate 51 is kept in contact with the first electrode plate 51, the second separator region 62 and the second electrode plate 52 are stacked, After pressurizing the second electrode plate 52 using the pressing member 82, even if the pressing member 82 is to be detached from the first electrode plate 51, the pressing member 82 that contacts the first electrode plate 51 is not in contact with the first electrode plate 51. Since the portion in contact with 51 and the portion in which the pressing member 82 in contact with the second electrode plate 52 is in contact with the second electrode plate 52 are non-opposing, the pressing member 82 in contact with the first electrode plate 51. Can be easily detached.
  • the separator region 60 may be a so-called single-wafer type separator in which the separator regions 60 sandwiched between the electrode plates 50 are separated from each other and independent. As shown in FIG. 4, the plurality of separator regions 60 may constitute a part of the strip-shaped separator 70.
  • the electrode body 20 may have both a single wafer separator and a strip separator 70 as the separator region 60.
  • the strip-shaped separator 70 is folded so that the positive electrode terminal 7 and the negative electrode terminal 9 are stacked after the electrode plate 50 and the separator region 60 are stacked. It is done avoiding the provided side.
  • the strip separator 70 is disposed so that the longitudinal direction is along the x axis, and the strip separator 70 is folded back at the sides along the y axis of the positive plate 30 and the negative plate 40. Separator region 60 is laminated on 30 and negative electrode plate 40.
  • the separator region 60 includes a base material layer and at least one adhesive layer.
  • the adhesive layer is provided on at least one of the surfaces of the separator region 60, but is preferably provided on both surfaces of the separator region 60.
  • the adhesive layer may be provided only in a region corresponding to a position where the pressing member 82 abuts in the pressurizing step, but the distance between the electrode plate 50 and the separator region 60 is different within the contact surface.
  • it is preferable that the separator region 60 is provided substantially uniformly on the surface.
  • a porous sheet having ion permeability and insulating properties is used.
  • the porous sheet include a microporous thin film, a woven fabric, and a nonwoven fabric.
  • the material for the base material layer is not particularly limited, and examples thereof include polyolefin resins such as polyethylene and polypropylene.
  • the base material layer may contain materials (for example, cellulose etc.) other than resin.
  • the base material layer may be a laminate, for example, a laminate including a polyethylene layer and a polypropylene layer. Examples of the material contained in the adhesive layer include polyvinylidene fluoride and an acrylic crosslinkable polymer.
  • the thickness of the separator region 60 is not particularly limited, and is, for example, 5 ⁇ m or more and 50 ⁇ m or less.
  • the thickness of the base material layer and the thickness of the adhesive layer are not particularly limited.
  • the base material layer is preferably 1 ⁇ m to 30 ⁇ m and the adhesive layer is preferably 0.01 ⁇ m to 10 ⁇ m.
  • the positive electrode plate 30 includes, for example, a positive electrode current collector 6 and a positive electrode mixture layer formed on the positive electrode current collector 6.
  • a positive electrode current collector 6 a metal foil that is stable in the potential range of the positive electrode such as aluminum, a film in which the metal is disposed on the surface layer, or the like can be used.
  • the positive electrode mixture layer preferably includes a positive electrode active material, and further includes a conductive material and a binder.
  • the positive electrode mixture layer is preferably formed on both surfaces of the positive electrode current collector 6.
  • a lithium-containing composite oxide is used as the positive electrode active material. Examples of suitable lithium-containing composite oxides include lithium-containing composite oxides such as nickel-cobalt-manganese and nickel-cobalt-aluminum.
  • the positive electrode mixture layer formed on the positive electrode plate 30 has, for example, a rectangular shape.
  • the positive electrode lead 32 has a shape protruding from one end of one side of the region where the positive electrode mixture layer is formed.
  • the positive electrode lead 32 is a portion where the surface of the positive electrode current collector 6 is exposed, and is thereby electrically connected to the positive electrode terminal 7. It is preferable to provide a protective layer having a higher electrical resistance than the insulating layer or the positive electrode core at the root portion where the positive electrode lead 32 and the region where the positive electrode mixture layer is formed.
  • the thickness of the positive electrode plate 30 is not particularly limited, and is, for example, 20 ⁇ m or more and 300 ⁇ m or less.
  • the positive electrode plate 30 is formed by applying a positive electrode mixture slurry containing a positive electrode active material, a conductive material, a binder, and the like to the long positive electrode current collector 6 and rolling the coating film to collect the positive electrode mixture layer. After forming on both surfaces of the electric body, it can be manufactured by cutting it into the dimensions of each positive electrode plate 30 and positive electrode lead 32. The positive electrode mixture slurry is not applied to the portion of the positive electrode current collector 6 that becomes the positive electrode lead 32.
  • the negative electrode plate 40 includes, for example, a negative electrode current collector 8 and a negative electrode mixture layer formed on the surface of the negative electrode current collector 8.
  • a negative electrode current collector 8 a metal foil that is stable in the potential range of a negative electrode such as copper, a film in which the metal is disposed on the surface layer, or the like can be used.
  • the negative electrode mixture layer preferably contains a binder together with the negative electrode active material.
  • the negative electrode mixture layer is preferably formed on both surfaces of the negative electrode current collector 8.
  • the negative electrode active material is not particularly limited as long as it can reversibly occlude and release lithium ions.
  • carbon materials such as natural graphite and artificial graphite, metals such as Si and Sn, and metals that form an alloy with lithium, and Further, alloys of these metals and composite oxides can be used.
  • the negative electrode plate 40 has the same shape as the positive electrode plate 30.
  • the dimension of the negative electrode plate 40 is preferably larger than the dimension of the positive electrode plate 30 in order to ensure smooth movement of lithium ions between the positive and negative electrodes.
  • the negative electrode mixture layer formed on the negative electrode plate 40 has, for example, a rectangular shape.
  • the negative electrode lead 42 is an end portion on one side of the region where the negative electrode mixture layer is formed, and has a shape protruding from the end portion on the side different from the positive electrode lead 32.
  • the negative electrode lead 42 is a portion where the surface of the negative electrode current collector 8 is exposed, and is thereby electrically connected to the negative electrode terminal 9.
  • the thickness of the negative electrode plate 40 is not particularly limited, and is, for example, 20 ⁇ m or more and 300 ⁇ m or less.
  • the negative electrode plate 40 is formed by applying a negative electrode mixture slurry containing a negative electrode active material, a binder, and the like to a long negative electrode current collector 8, rolling the coating film, and applying a negative electrode mixture layer on both sides of the current collector. After being formed, it can be manufactured by cutting it into the dimensions of each negative electrode plate 40 and negative electrode lead 42. The negative electrode mixture slurry is not applied to the portion of the negative electrode current collector 8 that becomes the negative electrode lead 42.
  • the non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the non-aqueous electrolyte is not limited to a liquid electrolyte (electrolytic solution), and may be a solid electrolyte using a gel polymer or the like.
  • non-aqueous solvent examples include cyclic carbonates such as ethylene carbonate (EC) generally used as non-aqueous solvents, chain esters such as dimethyl carbonate (DMC) and diethyl carbonate (DEC), and ⁇ -butyrolactone. (GBL) and other carboxylic acid esters, crown ethers and other cyclic ethers, chain ethers, nitriles, amides, and halogen substitutions in which the hydrogen atom of the non-aqueous solvent is replaced with a halogen atom such as a fluorine atom Body, a mixed solvent thereof and the like can be used.
  • EC ethylene carbonate
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • GBL ⁇ -butyrolactone
  • carboxylic acid esters crown ethers and other cyclic ethers, chain ethers, nitriles, amides, and halogen substitutions in which the hydrogen atom of the non-aqueous
  • the electrolyte salt for example, a general lithium salt used as a supporting salt in a conventional nonaqueous electrolyte secondary battery can be used.
  • the lithium salt include LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , LiN (FSO 2 ) 2 , LiN (C 1 F 2l + 1 SO 2 ) (C m F 2m + 1 SO 2 ) ( l, m is an integer of 1 or more), LiC (C P F 2p + 1 SO 2) (C q F 2q + 1 SO 2) (C r F 2r + 1 SO 2) (p, q, r is an integer of 1 or more), Li [ B (C 2 O 4 ) 2 ] (bis (oxalate) lithium borate (LiBOB)), Li [B (C 2 O 4 ) F 2 ], Li [P (C 2 O 4 ) F 4 ], and li [P (C 2 O 4 ) 2 F 2 ,

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Cell Separators (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

L'invention porte sur un procédé de fabrication d'une cellule dans lequel, dans un procédé de stratification d'une plaque d'électrode et d'une région de séparateur, l'écart de stratification de la plaque d'électrode stratifiée et de la région de séparateur peut être supprimé. Le procédé de fabrication d'une cellule comprend : une première étape de montage d'une première région de séparateur (61) ayant une première couche d'adhésion (611) sur au moins une surface ; une deuxième étape de stratification d'une première plaque d'électrode (51), qui présente une première surface et une seconde surface du côté opposé à la première surface, sur la première région de séparation (61), de sorte que la première surface et la première couche d'adhérence (611) se touchent ; une troisième étape consistant à stratifier une seconde région de séparation (62) sur la première plaque d'électrode (51) ; et une étape d'adhésion consistant à faire adhérer la première surface et la première couche d'adhérence (611) avant la troisième étape.
PCT/JP2017/024480 2016-07-07 2017-07-04 Procédé de fabrication d'une cellule WO2018008632A1 (fr)

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JP2016135176A JP6961329B2 (ja) 2016-07-07 2016-07-07 電池の製造方法
JP2016-135176 2016-07-07

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