JP2020053116A - Method for manufacturing laminated secondary battery, and sealing device - Google Patents

Abstract

To effectively prevent welding of exterior materials in an unintended region.SOLUTION: A method for manufacturing a laminated secondary battery includes a step of sealing a laminate exterior body by heating an exterior material of the laminate exterior body that contains an electrode body 5 and an electrolyte. In the step of sealing the laminate exterior body, a heating part is brought into contact with a region to be sealed of the exterior material, and a heat removing part having a lower temperature than the heating part is also brought into contact with a region different from the region to be sealed of the exterior material.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a method for producing a laminated secondary battery and a sealing device used for producing a laminated secondary battery.

  2. Description of the Related Art In recent years, a laminated secondary battery manufactured by sealing a battery element (electrode body) in a laminate exterior body has been widely used. The laminate exterior body is usually formed by heat-welding two exterior materials each having a thin metal layer such as aluminum and a sealant layer laminated on the metal layer. The two exterior materials that form the laminate exterior are arranged such that the sealant layers face each other. The sealant layer usually contains a resin having thermoplasticity. By bringing the heat bar into contact with the exterior material and heating the exterior material, the two facing sealant layers are welded and the two exterior materials laminated can be bonded (sealed). It is known that such sealing conditions involve heat, pressure, and time.

JP 2014-517458 A JP 2017-130374 A

  However, depending on the sealing conditions, the two exterior materials laminated may be bonded to each other even in a region other than the region to be bonded. That is, in some cases, two exterior materials are bonded in an unintended region of the laminate exterior body. In order to cope with this inconvenience, a measure of providing a sealant layer only in a region to be bonded may be considered. However, such a treatment, that is, a treatment for adjusting the arrangement of the sealant layer each time, is difficult to adopt in the case of small-volume production or the like, and cannot be a general countermeasure.

  The present invention has been made in consideration of the above points, and has as its object to effectively prevent welding of an exterior material in an unintended region.

The method for producing the first laminated secondary battery according to the present invention comprises:
A laminate secondary battery having a laminate exterior body formed using an exterior material including a metal layer and a sealant layer laminated on the metal layer, and an electrode body and an electrolyte disposed in the laminate exterior body. A method of manufacturing,
A step of sealing the laminate exterior body by heating the exterior material of the laminate exterior body containing the electrode body and the electrolytic solution,
In the step of sealing the laminate outer package, a heating unit is brought into contact with a region to be sealed of the outer package, and a lower temperature than the heating unit in a region different from the region to be sealed of the outer package. Contact the heat removal part.

  In the step of sealing the laminate exterior body of the first method for producing a laminate type secondary battery according to the present invention, the heat removal unit may include the exterior material before the heating unit starts contacting the exterior material. It may be arranged to start the contact with.

  In the step of sealing the laminate exterior body of the first method for producing a laminated secondary battery according to the present invention, the heat removal unit is separated from the exterior material after the heating unit is separated from the exterior material. It may be.

  In the step of sealing the laminate exterior body of the first method for producing a laminate type secondary battery according to the present invention, the heat removal unit is also attached to the exterior material during the entire period in which the heating unit is in contact with the exterior material. It may be in contact.

  In the step of sealing the laminate exterior body in the first method of manufacturing a laminate type secondary battery according to the present invention, the heat removal unit may be cooled.

  In the step of sealing the laminate exterior body in the first method of manufacturing a laminated secondary battery according to the present invention, the heating unit is at least 120 ° C., and the heat removing unit is at or below 80 ° C. Is also good.

The method for producing the second laminated secondary battery according to the present invention comprises:
A laminate secondary battery having a laminate exterior body formed using an exterior material including a metal layer and a sealant layer laminated on the metal layer, and an electrode body and an electrolyte disposed in the laminate exterior body. A method of manufacturing,
A step of sealing the laminate exterior body by heating the exterior material of the laminate exterior body containing the electrode body and the electrolytic solution,
The step of sealing the opening includes a step of bringing a heating unit into contact with the exterior material, and a step of bringing a heat removal unit lower in temperature than the heating unit into contact with the exterior material.

  In the step of sealing the laminate exterior body in the second method of manufacturing a laminate type secondary battery according to the present invention, the heat removal unit is brought into contact with the exterior material rather than the step of bringing the heating unit into contact with the exterior material. Alternatively, the step of starting may be started first.

  In the step of sealing the laminate exterior body in the second method of manufacturing a laminated secondary battery according to the present invention, the step of contacting the heating unit with the exterior material includes the step of contacting the heat removal unit with the exterior material. You may make it complete | finish before a process.

  In the step of sealing the laminate exterior body of the second method for producing a laminate type secondary battery according to the present invention, the exterior of the exterior is covered over the entire period in which the step of contacting the heating portion with the exterior material is actually performed. A step of contacting the heat removal unit with a material may be performed.

  In the step of contacting the heat removal unit with the exterior material in the second method of manufacturing a laminated secondary battery according to the present invention, the heat removal unit may be cooled.

  In the step of contacting the heating portion with the exterior material in the second method of manufacturing a laminated secondary battery according to the present invention, the heating portion is at 120 ° C. or higher, and the heat removal portion is brought into contact with the exterior material. In the step of causing, the temperature of the heat removal unit may be set to 80 ° C. or less.

  In the first or second method for manufacturing a laminate type secondary battery according to the present invention, the heat removal unit includes a region of the exterior material facing the electrode body, and a region where the heating unit contacts, It may be made to contact the area located between them.

  In the first or second method for manufacturing a laminated secondary battery according to the present invention, the heat removal unit may be in contact with a region of the exterior material including the sealant layer.

  The step of sealing the laminate exterior body in the first or second method of manufacturing a laminated secondary battery according to the present invention may be performed in a reduced-pressure environment.

  In the first or second method of manufacturing a laminated secondary battery according to the present invention, a region of the exterior material where the heat removal unit contacts and a region where the heating unit contacts may be separated from each other.

The sealing device according to the present invention,
A laminate type secondary battery having a laminate exterior body formed using an exterior material including a metal layer and a sealant layer laminated on the metal layer, and an electrode body and an electrolytic solution disposed in the laminate exterior body When manufacturing a sealing device for sealing the laminate body containing the electrode body and the electrolyte solution,
A heating unit that heats the exterior material in contact with a region to be sealed of the exterior material,
A heat removal unit having a lower temperature than the heating unit in contact with a region of the exterior material that is different from the region to be sealed.

  In the sealing device according to the present invention, the heat removal unit may start contacting the exterior material before the heating unit starts contacting the exterior material.

  In the sealing device according to the present invention, the heat removal unit may be separated from the exterior material after the heating unit is separated from the exterior material.

  In the sealing device according to the present invention, the heat removal unit may be in contact with the exterior material during the entire period in which the heating unit is in contact with the exterior material.

  In the sealing device according to the aspect of the invention, the heat removal unit may be configured to contact a region between the region of the exterior material facing the electrode body and a region where the heating unit contacts. You may.

  In the sealing device according to the present invention, the heat removal unit may be in contact with a region including the sealant layer in the exterior material.

  The sealing device according to the present invention may further include a decompression chamber containing the heating unit and the heat removal unit.

  In the sealing device according to the present invention, the heat removal unit may be disposed apart from the heating unit.

  The sealing device according to the present invention may further include a heating mechanism for heating the heating unit.

  The sealing device according to the present invention may further include a cooling mechanism for cooling the heat removal unit.

  In the sealing device according to the present invention, the heating section may have a temperature of 120 ° C. or higher, and the heat removing section may have a temperature of 80 ° C. or lower.

  In the sealing device according to the present invention, the heat removal unit may include a metal plate-shaped portion that contacts the exterior material.

  In the sealing device according to the present invention, a heat capacity of the plate-shaped portion may be larger than a heat capacity of a region of the exterior material with which the plate-shaped portion contacts.

  In the sealing device according to the present invention, the heat removal unit further includes a shielding unit connected to the plate-shaped unit and shielding a region of the exterior material containing the electrode body and the electrolytic solution from the heating unit. You may be able to do it.

In the sealing device according to the present invention,
The heat removal unit includes a pair of heat removal units,
The pair of heat removal units may contact the exterior material from both sides so as to sandwich the exterior material therebetween.

  ADVANTAGE OF THE INVENTION According to this invention, welding of an exterior material in an unintended area | region can be prevented effectively.

FIG. 1 is a view for explaining one embodiment of the present invention, and is a perspective view showing a laminated secondary battery. FIG. 2 is a perspective view showing the inside of the laminate type secondary battery of FIG. 1 from which a laminate exterior body, an insulator and the like are removed. FIG. 3 is a vertical cross-sectional perspective view for explaining a laminated structure of an electrode plate and an insulator of the laminated secondary battery of FIG. FIG. 4 is a top view showing an electrode plate and an insulator of the laminated secondary battery of FIG. FIG. 5 is a longitudinal sectional view showing a section along the width direction of the laminate type secondary battery of FIG. FIG. 6 is a partial vertical cross-sectional view showing a cross section of the laminate type secondary battery of FIG. 1 along a take-out direction. FIG. 7 is a longitudinal sectional view illustrating an example of a method for manufacturing a laminated secondary battery. FIG. 8 is a vertical cross-sectional view illustrating an example of a method for manufacturing a laminated secondary battery. FIG. 9 is a longitudinal sectional view illustrating an example of a method for manufacturing a laminated secondary battery. FIG. 10 is a vertical cross-sectional view illustrating an example of a method for manufacturing a laminated secondary battery. FIG. 11 is a longitudinal sectional view illustrating an example of a method for manufacturing a laminated secondary battery. FIG. 12 is a diagram for explaining a method of sealing a sample used in an experiment. FIG. 13 is a view corresponding to FIG. 9 and is a longitudinal sectional view for explaining a conventional example of a method of manufacturing a laminated secondary battery. FIG. 14 is a plan view showing a laminated secondary battery manufactured by a conventional manufacturing method.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, in the drawings attached to the present specification, for convenience of understanding, the scales and the dimensional ratios in the vertical and horizontal directions are appropriately changed from those of the actual ones and exaggerated.

  FIG. 1 to FIG. 12 are views for explaining an embodiment of a laminated electrode according to the present invention.

  In one embodiment described below, a laminate type secondary battery 1 includes a laminate exterior body 40, an electrode body 5 housed in the laminate exterior body 40, and a laminate exterior body 40 connected to the electrode body 5. And a tab 3 extending from the inside to the outside. Of these, the laminate exterior body 40 is formed by laminating two exterior materials 41 and 42 and bonding (welding) the peripheral edges of the exterior materials 41 and 42. That is, the bonding region Aj formed by bonding the two exterior materials 41 and 42 is provided on the periphery of the laminate exterior body 40. The tab 3 passes between the two exterior members 41 and 42 and extends from the inside of the laminate exterior body 40 to the outside. The electrode body 5 includes a first electrode plate 10 and a second electrode plate 20 that are alternately stacked, and an insulator 30 located between the first electrode plate 10 and the second electrode plate 20.

  In such a laminated secondary battery 1, as described in the section of the background art, the sealant layer 45 of the package members 41 and 42 is peeled off and the metal layer 44 is exposed, so that the electrode plates 10 and 20 and the laminate package are exposed. A short circuit with body 40 can occur. When a short circuit occurs between the electrode plates 10 and 20 and the laminate exterior body 40, the laminate type secondary battery 1 cannot perform its intended function. On the other hand, in the laminate type secondary battery 1 according to the present embodiment, as described below, a device for preventing peeling of the sealant layer 45 from the laminate exterior body 40 is devised. Therefore, the laminated secondary battery 1 according to the present embodiment can stably exhibit the expected functions, and has excellent reliability in this respect.

  Hereinafter, an example in which the laminated secondary battery 1 constitutes a laminated lithium ion secondary battery will be described. In this example, the first electrode plate 10 constitutes a positive electrode plate 10X, and the second electrode plate 20 constitutes a negative electrode plate 20Y. However, as can be understood from the description of the operation and effect described below, the embodiment described here is not limited to the lithium ion secondary battery, but is also applicable to secondary batteries other than lithium ion. The present invention is not limited to a stacked secondary battery, and can be applied to a wound secondary battery. That is, the present embodiment can be widely applied to the laminate type secondary battery 1 in which the electrode body 5 is accommodated in the laminate exterior body 40.

  First, the configuration of the laminate exterior body 40 will be described. The laminate exterior body 40 is a packaging material for sealing the electrode body 5. As shown in FIGS. 1, 5 and 6, the laminate exterior body 40 has a first exterior material 41 and a second exterior material 42. Each of the exterior members 41 and 42 has a metal layer 44 and a sealant layer 45 laminated on the metal layer 44 (see FIGS. 6 and 7). The metal layer 44 preferably has high gas barrier properties and moldability.

  The material forming the metal layer 44 is not particularly limited as long as it improves the strength of the entire laminated secondary battery while preventing invasion of moisture from the outside. Metals, metal oxides, metal nitrides, and alloys thereof can be used. Aluminum, an aluminum alloy, stainless steel, or the like is preferable, and aluminum is particularly preferably used. As long as the strength of the whole battery can be ensured, a metal layer may be provided by vapor deposition or sputtering instead of the metal foil. The sealant layer 45 has an insulating property and prevents a short circuit between the metal layers 44 and the electrode plates 10 and 20 housed in the laminate exterior body 40. In addition, the sealant layer 45 has thermoplasticity (adhesion) in addition to insulation. The first exterior material 41 and the second exterior material 42 are stacked such that the sealant layers 45 face each other, and the peripheral edges thereof are welded to each other. Further, a space for accommodating the electrode body 5 is formed between the first exterior material 41 and the second exterior material 42. The laminate exterior body 40 hermetically seals the electrode body 5 and the electrolytic solution therein. The sealant layer 45 preferably has chemical resistance because it comes into contact with the electrolytic solution. As a material of such a sealant layer 45, polypropylene, modified polypropylene, low-density polypropylene, ionomer, ethylene / vinyl acetate can be used.

  In the illustrated example, the first exterior member 41 is formed as a plate-shaped member. On the other hand, the second exterior material 42 is formed in a cup shape. The second exterior member 42 has a cup-shaped bulging portion 42a and a flange portion 42b connected to the bulging portion 42a. The flange portion 42b surrounds the bulging portion 42a in a circumferential shape and is connected to the peripheral edge of the flange portion 42b. The flange portion 42b is adhered to the first exterior material 41 so as to seal the accommodation space between the first exterior material 41 and the second exterior material 42. The bulging portion 42a is manufactured by, for example, drawing.

  However, the present invention is not limited to the above example, and the laminate exterior body 40 may be formed by folding one exterior material. In this example, the laminate exterior body 40 has an adhesion region Aj formed by adhering exterior materials facing each other at an edge portion other than the folded portion.

  The tab 3 functions as a terminal in the laminated secondary battery 1. One tab 3 is electrically connected to the positive electrode plate 10X (first electrode plate 10) of the electrode body 5, and the other tab 3 is electrically connected to the negative electrode plate 20Y (second electrode plate 20) of the electrode body 5. doing. The tab 3 can be formed using aluminum, nickel, nickel-plated copper, or the like. The pair of tabs extend from the inside of the laminate case 40 to the outside of the laminate case 40. In the illustrated example, the tab 3 is pulled out of the electrode body 5 to the outside of the laminate exterior body 40 along the drawing direction dx.

  The space between the laminate exterior body 40 and the tab 3 is sealed in a region where the tab 3 extends. Specifically, as shown in FIGS. 1 and 6, a seal member 4 is provided between the tab 3 and the laminate exterior body 40. The sealing material 4 seals the space between the tab 3 and the laminate exterior body 40 to seal the accommodation space of the laminate exterior body 40. Further, the sealing material 4 has adhesiveness, and joins the tab 3 and the laminate exterior body 40. As shown in FIG. 6, seal members 4 are provided on both sides of the tab 3 in the laminating direction dz of the electrode plates 10 and 20, respectively.

  Next, the electrode body 5 will be described mainly with reference to the illustrated specific example. The electrode body 5 has a positive electrode plate 10X (first electrode plate 10) and a negative electrode plate 20Y (second electrode plate 20), and an insulator 30 located between the positive electrode plate 10X and the negative electrode plate 20Y. . First, the positive electrode plate 10X and the negative electrode plate 20Y will be described.

  As shown in FIGS. 2, 3, 5, and 6, the electrode body 5 has a plurality of positive plates 10X (first electrode plates 10) and a plurality of negative plates 20Y (second electrode plates 20). The number of the positive electrode plate 10X (the first electrode plate 10) and the number of the negative electrode plate 20Y (the second electrode plate 20) are, for example, 10 or more, or 15 or more, or 20 or more in one laminate exterior body 40, respectively. include. The positive electrode plates 10X and the negative electrode plates 20Y are alternately arranged along the stacking direction dz. The electrode body 5 and the laminated secondary battery 1 have a flat shape as a whole, have a small thickness in the laminating direction dz, and extend in a drawing direction dx and a width direction dy orthogonal to the laminating direction dz.

  In addition, in order to clarify the directional relationship between the drawings, some of the drawings show a drawing direction dx, a width direction dy, and a stacking direction dz as directions common to the drawings.

  In the illustrated non-limiting example, the positive electrode plate 10X and the negative electrode plate 20Y have a rectangular outer contour. The positive electrode plate 10X and the negative electrode plate 20Y have a longitudinal direction in a drawing direction dx perpendicular to the laminating direction dz, and a short direction in a width direction dy perpendicular to both the laminating direction dz and the drawing direction dx. As shown in FIG. 2 and FIG. 4, the positive electrode plate 10X and the negative electrode plate 20Y are arranged so as to be shifted in the drawing direction dx. More specifically, the plurality of positive electrode plates 10X are disposed closer to one side (lower left side in FIG. 2 and the left side in FIG. 4) in the drawing direction dx, and the plurality of negative electrode plates 20Y are positioned on the other side in the drawing direction dx. (The upper right side in FIG. 2 and the right side in FIG. 4). The positive electrode plate 10X and the negative electrode plate 20Y overlap in the stacking direction dz at the center in the drawing direction dx. In FIG. 2, illustration of the insulator 30 is omitted.

  The positive electrode plate 10X (first electrode plate 10) has a sheet-like outer shape as illustrated. The positive electrode plate 10X (first electrode plate 10) includes a positive electrode current collector 11X (first electrode current collector 11) and a positive electrode active material layer 12X (first electrode active material layer) provided on the positive electrode current collector 11X. 12). In the lithium ion secondary battery, the positive electrode plate 10X emits lithium ions when discharging and occludes lithium ions when charging.

  The positive electrode current collector 11X has a first surface 11a and a second surface 11b facing each other as main surfaces. The positive electrode active material layer 12X is formed on at least one of the first surface 11a and the second surface 11b of the positive electrode current collector 11X. Specifically, when the first surface 11a or the second surface 11b of the positive electrode current collector 11X is located at the outermost position in the stacking direction dz of the electrode plates 10 and 20 included in the electrode body 5, the positive electrode current collector The positive electrode active material layer 12X is not provided on the outermost surface of the conductor 11X. Except for the presence or absence of the positive electrode active material layer 12X depending on the position of the positive electrode current collector 11X, the plurality of positive electrode plates 10X included in the laminated secondary battery 1 have the positive electrode active material layers 12X on both sides of the positive electrode current collector 11X. And can be configured identically to each other.

The positive electrode current collector 11X and the positive electrode active material layer 12X can be manufactured by various manufacturing methods using various materials applicable to the laminated secondary battery 1 (lithium ion secondary battery). As an example, the positive electrode current collector 11X can be formed of an aluminum foil. The positive electrode active material layer 12X contains, for example, a positive electrode active material, a conductive additive, and a binder serving as a binder. The positive electrode active material layer 12X is formed by applying a positive electrode slurry obtained by dispersing a positive electrode active material, a conductive auxiliary agent, and a binder in a solvent onto a material forming the positive electrode current collector 11X and solidifying the slurry. Can be done. As the positive electrode active material, for example, a lithium metal oxide compound represented by a general formula LiM _x O _y (where M is a metal and x and y are the composition ratio of metal M and oxygen O) is used. Specific examples of the lithium metal oxide compound include lithium cobaltate, lithium nickelate, lithium manganate and the like. Acetylene black or the like can be used as the conductive assistant. As the binder, polyvinylidene fluoride or the like can be used.

  As shown in FIG. 4, the positive electrode current collector 11X (first electrode current collector 11) has a first end region a1 and a first electrode region b1. The positive electrode active material layer 12X (first electrode active material layer 12) is disposed only in the first electrode region b1 of the positive electrode current collector 11X. The first end region a1 and the first electrode region b1 are arranged in the drawing direction dx. The first end region a1 is located outside (left side in FIG. 4) in the extraction direction dx from the first electrode region b1. As shown in FIG. 6, the plurality of positive electrode current collectors 11X are joined and electrically connected in the first end region a1 by resistance welding, ultrasonic welding, sticking with tape, fusion, or the like. . In the illustrated example, one tab 3 is electrically connected to the positive electrode current collector 11X in the first end region a1. The tab 3 extends from the electrode body 5 in the drawing direction dx. On the other hand, as shown in FIG. 4, the first electrode region b1 is located in a region of the negative electrode plate 20Y facing a negative electrode active material layer 22Y described later. Then, as shown in FIG. 5, the width of the positive electrode plate 10X along the width direction dy is smaller than the width of the negative electrode plate 20Y along the width direction dy. With such an arrangement of the first electrode region b1, precipitation of lithium from the positive electrode active material layer 12X can be prevented.

  Next, the negative electrode plate 20Y (second electrode plate 20) will be described. The negative electrode plate 20Y also has a sheet-like outer shape, similarly to the positive electrode plate 10X. The negative electrode plate 20Y (second electrode plate 20) includes a negative electrode current collector 21Y (second electrode current collector 21) and a negative electrode active material layer 22Y (second electrode active material layer) provided on the negative electrode current collector 21Y. 22). In the lithium ion secondary battery, the negative electrode plate 20Y occludes lithium ions during discharging and releases lithium ions during charging.

  The negative electrode current collector 21Y has a first surface 21a and a second surface 21b facing each other as main surfaces. The negative electrode active material layer 22Y is formed on at least one of the first surface 21a and the second surface 21b of the negative electrode current collector 21Y. Specifically, when the first surface 21a or the second surface 21b of the negative electrode current collector 21Y is located at the outermost position in the stacking direction dz of the electrode plates 10 and 20 included in the electrode body 5, the negative electrode current collector 21Y The negative electrode active material layer 22Y is not provided on the outermost surface of the electric body 21Y. Except for the presence or absence of the anode active material layer 22Y depending on the position of the anode current collector 21Y, the plurality of anode plates 20Y included in the laminate type secondary battery 1 include the anode active material layers 22Y on both sides of the anode current collector 21Y. And can be configured identically to each other.

  The negative electrode current collector 21Y and the negative electrode active material layer 22Y can be manufactured by various manufacturing methods using various materials applicable to the laminated secondary battery 1 (lithium ion secondary battery). As an example, the negative electrode current collector 21Y is formed of, for example, a copper foil. The negative electrode active material layer 22Y includes, for example, a negative electrode active material made of a carbon material and a binder functioning as a binder. The negative electrode active material layer 22Y forms, for example, a negative electrode slurry formed by dispersing a negative electrode active material composed of carbon powder, graphite powder, and the like and a binder such as polyvinylidene fluoride in a solvent, as a negative electrode current collector 21Y. It can be produced by coating and solidifying on a material.

  As shown in FIG. 4, the negative electrode current collector 21Y (second electrode current collector 21) has a second end region a2 and a second electrode region b2. The negative electrode active material layer 22Y (second electrode active material layer 22) is disposed in the second electrode region b2 of the negative electrode current collector 21Y. The second end region a2 and the second electrode region b2 are arranged in the drawing direction dx. The second end region a2 is located outside (in the right side in FIG. 4) in the extraction direction dx from the second electrode region b2. The plurality of negative electrode current collectors 21Y are joined and electrically connected to each other in the second end region a2 by resistance welding, ultrasonic welding, sticking with tape, fusion, or the like. One tab 3 can be electrically connected to the negative electrode current collector 21Y in the second end region a2. The tab 3 extends from the electrode body 5 in the drawing direction dx.

  As already described, the first electrode region b1 of the positive electrode plate 10X is located inside the region facing the second electrode region b2 of the negative electrode plate 20Y (see FIG. 4). That is, the second electrode region b2 extends to a region including the region of the positive electrode plate 10X facing the positive electrode active material layer 12X. As shown in FIG. 5, the width of the negative electrode plate 20Y along the width direction dy is wider than the width of the positive electrode plate 10X along the width direction dy.

  Next, the insulator 30 will be described. The insulator 30 is located between the positive electrode plate 10X (first electrode plate 10) and the negative electrode plate 20Y (second electrode plate 20). The insulator 30 prevents a short circuit due to contact between the positive electrode plate 10X (the first electrode plate 10) and the negative electrode plate 20Y (the second electrode plate 20). The insulator 30 preferably has high ion permeability (air permeability), predetermined mechanical strength, and durability with respect to an electrolytic solution, a positive electrode active material, a negative electrode active material, and the like. As such an insulator 30, for example, a porous body or a nonwoven fabric formed of an insulating material can be used. An electrolytic solution is sealed in the laminate exterior body 40 together with the electrode body 5. By impregnating the insulator 30 made of a porous body or a nonwoven fabric with the electrolyte, the electrolyte is kept in contact with the electrode active material layers 12 and 22 of the electrode plates 10 and 20.

  In the illustrated example, a single insulator 30 is located between any two electrode plates 10 and 20 adjacent in the stacking direction dz. The insulator 30 is a bendable sheet-shaped member. The insulator 30 has a first surface 30a and a second surface 30b as a pair of main surfaces facing each other. As shown in FIGS. 3 and 5, the insulator 30 is alternately folded in the width direction dy in the opposite direction, thereby extending sequentially between the positive electrode plate 10 </ b> X and the negative electrode plate 20 </ b> Y adjacent in the stacking direction dz. The insulator 30 has a first folded portion 31 folded on one side in the width direction dy, and a second folded portion 32 folded on the other side opposite to the one side in the width direction dy. That is, the insulator 30 has a zigzag shape. However, in the present embodiment, the insulator 30 does not need to be in a serpentine shape, and the sheet-like insulator 30 is formed by the positive electrode plate 10X (the first electrode plate 10) and the negative electrode plate 20Y (the second electrode plate). 20), the positive electrode plate 10X (first electrode plate 10) and the negative electrode plate 20Y (second electrode plate 20) may be insulated.

  As shown in FIG. 4, the insulator 30 extends so as to cover the entire region of the positive electrode active material layer 12X of the positive electrode plate 10X in plan view. Therefore, as shown in FIG. 5, the width of the insulator 30 in the width direction dy is wider than the width of the positive electrode plate 10X in the width direction dy. Further, the length of the insulator 30 in the extraction direction dx is longer than the length of the positive electrode active material layer 12X in the extraction direction dx.

  Similarly, as shown in FIG. 4, in plan view, the insulator 30 extends so as to cover the entire region of the negative electrode active material layer 22Y of the negative electrode plate 20Y. That is, the width of the insulator 30 in the width direction dy is wider than the width of the negative electrode plate 20Y in the width direction dy. Further, the length of the insulator 30 in the extraction direction dx is longer than the length of the negative electrode active material layer 22Y in the extraction direction dx.

  As the insulator 30, a resinous porous film can be used. More specifically, a porous film made of a thermoplastic resin having a melting point of about 80 to 140 ° C. can be used as the insulator 30. Polyolefin-based polymers such as polypropylene and polyethylene can be used as the thermoplastic resin.

  Further, the insulator 30 may include a base layer and a functional layer laminated on the base layer. According to such a configuration, the first surface 30a of the insulator 30 facing the positive electrode plate 10X and the second surface 30b of the insulator 30 facing the negative electrode plate 20Y may have different properties. it can. For example, the functional layer having a large porosity may face the negative electrode plate 20Y in which the electrolyte is likely to dry in a large area, and the base material layer may face the positive electrode plate 10X. Further, as another example, the functional layer having excellent heat resistance may face the positive electrode plate 10 </ b> X, which easily rises in temperature, and the base material layer may face the negative electrode plate 20 </ b> Y. As the base material layer, for example, the resin porous film described immediately above can be used. As the functional layer, for example, a layer containing an inorganic material can be employed. The inorganic material can impart excellent heat resistance, for example, heat resistance of 150 ° or more to the functional layer. Examples of such an inorganic material include cellulose and modified substances thereof, polyolefin, polyethylene terephthalate, polybutylene terephthalate, polypropylene, polyester, polyacrylonitrile, aramid, polyamideimide, and fibrous materials and particulate materials such as polyimide. By using such an inorganic material, it becomes possible to give a higher porosity to the functional layer than to the base material layer.

  Next, a method for manufacturing the laminated secondary battery 1 having the above-described configuration will be described.

  First, the electrode body 5 is formed by laminating the positive electrode plate 10X and the negative electrode plate 20Y, and the insulator 30 that insulates the positive electrode plate 10X and the negative electrode plate 20Y. The positive electrode plate 10X, the negative electrode plate 20Y, and the insulator 30 can be manufactured by the above-described materials and the manufacturing method. Next, the manufactured positive electrode plate 10X, negative electrode plate 20Y, and insulator 30 are laminated so that the insulator 30 is located between the positive electrode plate 10X and the negative electrode plate 20Y. After that, the positive electrode current collectors 11X of the plurality of positive electrode plates 10X are electrically connected to each other and further to the tab 3. Similarly, the negative electrode current collectors 21 </ b> Y of the plurality of negative electrode plates 20 </ b> Y are electrically connected to each other and further to the tab 3.

  Next, a first exterior material 41 and a second exterior material 42 that constitute the laminate exterior body 40 are prepared. A bulging portion 42a is formed in the second exterior material 42 by, for example, drawing. Next, the electrode body 5 is accommodated in the bulging portion 42 a of the second exterior material 42, and the first exterior material 41 is further laminated on the second exterior material 42. At this time, the sealant layer 45 of the second exterior material 42 and the sealant layer 45 of the first exterior material 41 face each other. Further, as shown in FIG. 7, each tab 3 extends from between the first exterior material 41 and the second exterior material 42. Next, from this state, the first exterior material 41 and the second exterior material 42 are welded at positions surrounding the bulging portion 42a from three sides. Specifically, the adhesive regions A1 extending linearly are formed on both sides in the direction corresponding to the drawing direction dx and on one side in the direction corresponding to the width direction dy. The bonding area A1 can be formed by pressing the heated heat bar against the first exterior material 41 and the second exterior material 42. For example, by heating the first exterior material 41 and the second exterior material 42 with a heat bar heated to 120 ° or more, the two sealant layers 45 are melted and then solidified and welded.

  In addition, the sealing material 4 described above is fixed to the tab 3 between the exterior materials 41 and 42 and the tab 3. The sealing material 4 is welded to the exterior materials 41 and 42 to seal between the tab 3 and the exterior materials 41 and 42.

  Thereafter, an electrolyte is injected through the opening Z into the laminate exterior body 40 in which the adhesive region A1 is formed on three sides and the opening Z is formed on one side. Next, by bonding (sealing) the package members 41 and 42 in the region Aa to be bonded, the electrode body 5 and the electrolytic solution can be sealed in the laminate package 40. The sealing of the opening Z can be realized by pressing the heat bar against the exterior materials 41 and 42.

  By the way, as described in the section of the background art, when the heat bar 151 is brought into contact with the exterior materials 141 and 142 to seal the opening Z, the two exterior materials 141 and 142 are also arranged in a region other than the region Aa to be bonded. May be adhered. That is, the two exterior members 141 and 142 may be bonded to each other in an unintended region of the exterior members 141 and 142. In order to cope with this inconvenience, it is conceivable to provide a sealant layer only in the intended bonding area Aa. However, such measures are difficult to adopt in the case of small-volume production and the like, and cannot be a general countermeasure.

  In addition, the present inventors contact the exterior materials 141 and 142 on which the sealant layer is laminated in addition to the bonding expected area Aa with the heat bar 151 under reduced pressure, and seal the electrode body 105 inside the laminated exterior body 140. It was confirmed that this problem could occur more remarkably in the laminated secondary battery 101 (see FIG. 14).

  First, the step of sealing the electrode body 105 inside the laminate exterior body 140 is performed in an environment under reduced pressure, as shown in FIG. 13, in order to prevent air from entering the laminate exterior body 140, It is preferably performed in a reduced pressure chamber 155 as shown in FIG. However, due to space restrictions in the decompression chamber 155, the heated or heated heat bar 151 is arranged near the exterior materials 141 and 142. For this reason, even in a region other than the region Aa to be bonded, the heat radiated from the heat bar 151 easily melts the sealant layer. In the laminated secondary battery finally obtained, as shown in FIG. 14, the bonding area A1 of the exterior materials 141 and 142 to which the sealant layer is welded is a wider area than the bonding expected area Aa. Then, the edges E1 and E2 of the bonding region A1 have irregular irregularities, and an island-shaped bonding region Ax separated from the bonding expected region Aa also occurs. Such a complex bonding area A1 provides a starting point for peeling of the two exterior materials 141 and 142 when a force for separating the two exterior materials 141 and 142 is applied. That is, the two exterior materials 141 and 142 adhered to each other are easily peeled off from each other. In particular, in a lithium ion battery, gas may be generated from the electrolytic solution, and at this time, a force for peeling off the exterior materials 141 and 142 is generated due to an increase in the internal pressure of the laminate exterior body 140. When a force for peeling off the two exterior materials 141 and 142 is generated, it is assumed that the sealant layer is peeled off from the metal layer of one of the exterior materials 141 and 142, and that the metal layer is exposed in the laminate exterior body 140. . When the exposed metal layer comes into contact with the electrode body 105 accommodated in the laminate outer package and short-circuits, a serious problem such as deposition occurs.

  On the other hand, in the present embodiment, measures are taken to solve such a problem. With reference mainly to FIGS. 8 to 10 below, a step of sealing the opening Z according to the present embodiment and a sealing device 50 used in the step of sealing will be described.

  First, the sealing device 50 will be described. As shown in FIGS. 8 to 10, the sealing device 50 includes a heating unit 51 that heats the exterior materials 41 and 42 by coming into contact with the regions Aa to be bonded (areas to be sealed) of the exterior materials 41 and 42. It has a heat removal unit 52 that contacts an area of the exterior materials 41 and 42 that is different from the area Aa to be bonded, and a heating mechanism 53 that heats the heating unit 51. The heating unit 51 functions as a heat bar. The heating mechanism 53 is configured by, for example, a heating wire or the like, and heats the heating unit 51. The heating unit 51 is maintained at a temperature at which the sealant layer 45 can be melted, for example, 120 ° C. or more when it comes into contact with the exterior materials 41 and 42 by being heated.

  On the other hand, the heat removing section 52 contacts an area other than the adhesive area A1 to protect the area from heating. Therefore, the heat removal unit 52 is maintained at a lower temperature than the heating unit 51. The heat removal unit 52 is maintained at, for example, 80 ° C. or lower. In the illustrated example, the sealing device 50 further includes a cooling mechanism 54 fixed to an end of the heat removal unit 52. The cooling mechanism 54 cools the heat removal unit 52 by circulating a coolant, for example. The heat removal unit 52 is disposed apart from the heating unit 51. Therefore, it can be avoided that the heat removal unit 52 is heated by contacting the heating unit 51 and that the heating unit 51 is cooled by contacting the heat removal unit 52.

  As shown in FIGS. 9 and 10, the heat removal unit 52 has a metal plate-shaped portion 52a that comes into contact with the exterior materials 41 and 42, and a shielding portion 52b connected to the plate-shaped portion 52a. . Preferably, the heat capacity of the plate-shaped portion 52a is larger than the heat capacity of the region where the plate-shaped portion 52a is in contact with the exterior materials 41, 42, and more preferably, is larger than the heat capacity of the entire laminate exterior body 40. According to such a plate-like portion 52a, by contacting the exterior materials 41 and 42, heat is taken from the laminate exterior body 40, and the temperature of the exterior materials 41 and 42 can be effectively reduced. In addition, the shielding portion 52 b covers the region of the exterior materials 41 and 42 that contains the electrode body 5 and the electrolytic solution from the heating portion 51. That is, heat radiation from the heating unit 51 can be blocked by the blocking unit 52b. Such a heat removal unit 52 can be formed of, for example, a stainless steel plate. Further, in order to prevent damage to the laminate exterior body 40, the heat removing section 52 may further include a glass cloth tape covering a surface such as an end portion of the plate material, in addition to the stainless steel plate material.

  In the example shown in FIGS. 8 to 10, the sealing device 50 has a pair of heating units 51 and a pair of heat removal units 52. The pair of heating units 51 are arranged on both sides of the position where the laminate exterior body 40 is to be arranged. Similarly, the pair of heat removal units 52 are arranged on both sides of the position where the laminate exterior body 40 is to be arranged. The pair of heating units 51 can approach each other and can be separated from each other. Similarly, the pair of heat removal units 52 can also approach and separate from each other.

  Further, as shown in FIG. 8, the sealing device 50 further has a decompression chamber 55. Then, the laminate exterior body 40 is carried into the decompression chamber 55, and the opening Z thereof is sealed. The heating unit 51 and the heat removal unit 52 are movably held in a reduced pressure chamber 55.

  Next, a sealing step using the sealing device 50 will be described. The sealing step includes a step of bringing a heating unit into contact with the exterior material, and a step of bringing a heat removal unit having a lower temperature than the heating unit into contact with the exterior material. As described later, the step of contacting the heating unit with the exterior material and the step of contacting the heat removal unit at a temperature lower than the heating unit with the exterior material may be performed in parallel, or one of the two may be started first. Or one of them may be terminated first.

  First, as shown in FIG. 8, the decompression chamber 55 of the sealing device 50 is open. The laminate exterior body 40 containing the electrode body 5 and the electrolyte solution adhered on three sides is carried into the decompression chamber 55 by the carrier device 56. Next, as shown in FIG. 9, the pair of heat removal units 52 approach each other. The pair of heat removal sections 52 contact the exterior members 41 and 42 from both sides with the exterior members 41 and 42 interposed therebetween.

  Note that when the sealing device 50 continuously performs the sealing process on the different laminate exterior bodies 40, the heating unit 51 is in a sufficiently heated state. Then, in the conventional sealing step, it is considered that the exterior material 141 and 142 that are to be bonded and the surrounding material are heated even while the exterior materials 141 and 142 are positioned in the decompression chamber 155. Can be

  On the other hand, according to the present embodiment, the plate-shaped portion 52a of the heat removal unit 52 maintained at a temperature (for example, 80 ° C. or less) at which the sealant layer 45 is not welded comes into contact with the exterior materials 41 and 42, The exterior materials 41 and 42 are radiating heat. Therefore, even if the heating unit 51 in the heated state is located in the vicinity, melting of the sealant layer 45 occurs in the region of the exterior members 41 and 42 where the plate-shaped portion 52a of the heat removal unit 52 is in contact. Absent. Further, in a state where the plate-shaped portion 52a is in contact with the exterior materials 41 and 42, the shielding portion 52b of the heat removal unit 52 removes the region of the exterior materials 41 and 42 in which the electrode body 5 and the electrolyte are accommodated. It is shielded from the heating unit 51. Therefore, it is possible to effectively prevent the sealant layer 45 from being melted even in the region of the exterior materials 41 and 42 in which the electrode body 5 and the electrolytic solution are accommodated.

  It is preferable that the heat removal unit 52 is cooled by the cooling mechanism 54 in order to make the heat removal effect of the laminate exterior body 40 due to the contact of the heat removal unit 52 more effective. For example, the cooling mechanism 54 may continue to cool the heat removal unit 52 to a temperature at which the sealant layer 45 is not melted (for example, 80 ° C. or lower) while the heat removal unit 52 is in contact with the exterior materials 41 and 42. Good.

  In the illustrated example, the pair of heat removal sections 52 may function as a mechanism for holding the electrode body 5 and the laminate exterior body 40 containing the electrolyte in the decompression chamber 55. In this case, the holding of the laminate exterior body 40 by the transport device 56 is released by the pair of heat removal units 52 holding the laminate exterior body 40. Thereafter, the transfer device 56 is retracted outside the decompression chamber 55, and the decompression chamber 55 is sealed as shown in FIG. However, the present invention is not limited to this example, and a holding device for maintaining the posture of the laminate exterior body 40 in the decompression chamber 55 may be provided.

  After the decompression chamber 55 is sealed, the pressure in the decompression chamber 55 is reduced by a decompression unit (not shown). Thereby, gas is removed from the inside of the laminate exterior body 40. During the depressurization step, the heating unit 51 is heated by the heating mechanism 53 to a temperature at which the sealant layer 45 can be melted, for example, 120 ° C. or more when the heating unit 51 comes into contact with the exterior materials 41 and 42. However, even in the state shown in FIG. 11, the unintended exterior material 41, which is not in the area to be bonded Aa due to the contact of the plate portion 52 a of the heat removal unit 52 and the shielding of the shielding portion 52 b of the heat removal unit 52, In the region 42, the sealant layer 45 can be effectively prevented from melting.

  Next, as shown in FIG. 11, the pair of heating units 51 approach each other. The pair of heating units 51 come into contact with the exterior materials 41 and 42 from both sides so as to sandwich the exterior materials 41 and 42 therebetween. The heating unit 51 is heated by the heating mechanism 53 and maintained at a temperature (for example, 120 ° C.) at which the sealant layer 45 can be melted by contacting the exterior materials 41 and 42. Therefore, in the region where the heating unit 51 is in contact, the sealant layer 45 of the exterior materials 41 and 42 is melted. In addition, the heating unit 51 may be configured to contact not a whole area of the planned bonding area Aa but a part of the planned bonding area Aa. This is because it is assumed that the sealant layer 45 is also melted around the region where the heating unit 51 is in contact, and the bonding region A1 is wider than the region where the heating unit 51 is in contact. Alternatively, the temperature of the heating unit 51 may be strictly controlled by the heating mechanism 53 so that the sealant layer 45 is melted only in a region where the heating unit 51 is in contact. In this case, the heating unit 51 may be in contact with the entire area to be bonded Aa.

  Note that, as described above, the heat removal unit 52 is disposed apart from the heating unit 51. Therefore, on the exterior materials 41 and 42, the region where the heat removal unit 52 contacts and the region where the heating unit 51 contacts are separated.

  After sufficiently melting the sealant layer 45 of the exterior materials 41 and 42, the heating unit 51 is separated from the exterior materials 41 and 42. At this time, it is preferable that the heat removal unit 52 be kept in contact with the exterior materials 41 and 42. That is, the heating unit 51 and the heat removal unit 52 are again arranged in the state shown in FIG. In this state, the heating of the heating unit 51 by the heating mechanism 53 is stopped. The sealant layer 45 melted by the contact of the heating unit 51 is solidified again. As a result, the two sealant layers 45 disposed facing each other are welded, and the two exterior materials 41 and 42 including the sealant layer 45 are bonded to each other in the bonding area A1. In this manner, the opening Z of the laminate exterior body 40 is sealed, and the laminate type secondary battery 1 is obtained.

  Thereafter, the decompression chamber 55 is opened, and the transfer device 56 grips the laminate type secondary battery 1. Next, the heat removal unit 52 that also functions as a holding device in the decompression chamber 55 is separated from the laminated secondary battery 1. The transfer device 56 carries out the laminate type secondary battery 1 from the decompression chamber 55. The laminate type secondary battery 1 carried out of the decompression chamber 55 is trimmed with the exterior materials 41 and 42 located outside the bonding area A1 as necessary.

  Here, Table 1 shows an example of the result of the present inventors performing the above-described sealing step according to the present embodiment. As Examples 1 to 5, the sealing step was performed by the method described with reference to FIGS. 8 to 11, and the distance L2 between the heating unit 51 and the heat removal unit 52 was changed to change the width of the bonding region A1. The change in L3 was confirmed. The width W (see FIG. 7) of the opening Z of the laminate exterior body 40 was 509 mm, and the width L1 (see FIG. 12) of the heating unit 51 was 3 mm over the entire length of the opening Z. After maintaining the internal pressure of the decompression chamber 55 at 1 kP (Abs) for 25 seconds, the laminate exterior body 40 was sandwiched between the pair of heating units 51 maintained at 150 ° C. at a pressure of 0.4 MPa for 5 seconds. The heating section 51 was brought into contact with the edge of the laminate exterior body 40. The distance L2 (see FIG. 12) between the heat removal unit 52 and the heating unit 51 was 1 mm, 2 mm, 3 mm, 5 mm, and 10 mm. The temperature of the heat removal section 52 was set to 80 ° C. or less. As a comparative example, a sealing step was performed without using the heat removal unit 52. In the comparative example, the same conditions as in Examples 1 to 5 were used except that the heat removal part 52 was not used.

  In Examples 1 to 5 using the heat removal unit 52, the bonding area A1 was formed immediately before the heat removal unit 52, and the exterior materials 41 and 42 were bonded. In Examples 1 to 5, the sealant layer 45 did not melt in the region where the heat removal unit 52 was in contact. Further, in Examples 1 to 5, the edge E1 on the heat removal section 52 side of the bonding area A1 was substantially linear. On the other hand, in the comparative example in which the heat removing part 52 was not used, the width L3 of the bonding area A1 was 24 mm at the maximum while using the heating part 51 having a width of 3 mm. Further, in the comparative example, the edge portion E1 of the bonding region A1 had a complicated concavo-convex shape, and a large and small number of island-shaped welding regions Ax were formed.

  According to the embodiment described above, the sealing device 50 for sealing the electrode package 5 and the laminate package 40 containing the electrolytic solution is provided in the region to be sealed between the package members 41 and 42 (to be bonded). (Area) A heating unit 51 that contacts the Aa and heats the exterior materials 41 and 42, and a heat removal unit 52 that is lower in temperature than the heating unit 51 that contacts an area of the exterior materials 41 and 42 that is different from the area Aa to be sealed. And Then, in the step of sealing the laminate exterior body 40, the heating unit 51 is brought into contact with the areas Aa of the exterior materials 41 and 42 to be sealed, and the area different from the area Aa of the exterior materials 41 and 42 to be sealed. A heat removal unit 52 that is lower in temperature than the heating unit 51 is in contact with the heating unit 51. Therefore, the sealant layer 45 can be effectively prevented from being melted in a region other than the region (the region to be bonded) Aa of the exterior materials 41 and 42 to be sealed. Thereby, it is possible to effectively prevent the exterior materials 41 and 42 from adhering in an unintended region.

  Further, even if the sealing step is performed under reduced pressure, the heat removal unit 52 is brought into contact with a region of the exterior materials 41 and 42 that is different from the region to be sealed (the region to be bonded) Aa. Can be effectively prevented from including the intricate unevenness of the edges E1 and E2, and the formation of the island-shaped bonding region Ax at a position separated from the region Aa intended for bonding. Thereby, it is possible to effectively prevent the metal layer 44 from being exposed in the laminate exterior body 40 due to the peeling of the sealant layer 45 from the metal layer 44 of the exterior materials 41 and 42. As a result, a short circuit between the metal layer 44 of the exterior materials 41 and 42 and the electrode body 5 can be effectively prevented.

  In the specific example described above, in the step of sealing the laminate exterior body 40, the heat removal unit 52 contacts the exterior materials 41 and 42 before the heating unit 51 starts contacting the exterior materials 41 and 42. Has begun. Therefore, the heating of the laminate exterior body 40 brought into the sealing device 50 can be suppressed from an early stage. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas.

  In one specific example described above, in the step of sealing the laminate exterior body 40, the heat removal unit 52 is separated from the exterior materials 41 and 42 after the heating unit 51 is separated from the exterior materials 41 and 42. Therefore, the heating of the laminate exterior body 40 brought into the sealing device 50 can be suppressed until late. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas.

  In the specific example described above, in the step of sealing the laminate exterior body 40, the heat removal part 52 is also in contact with the exterior materials 41 and 42 during the entire period in which the heating unit 51 is in contact with the exterior materials 41 and 42. I have. Therefore, it is possible to suppress the heating of the laminate exterior body 40 brought into the sealing device 50 for a long period of time. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas.

  In one specific example described above, the heat removal unit 52 contacts a region located between the region facing the electrode body 5 and the region where the heating unit 51 contacts, of the exterior materials 41 and 42. . Therefore, it is advantageous that the edge E1 of the bonding region A1 on the side of the storage region for storing the electrode body 5 and the electrolytic solution includes intricate irregularities, and that the island-shaped bonding region Ax is formed in the storage region. Can be prevented. Thereby, a short circuit between the metal layer 44 of the exterior members 41 and 42 and the electrode body 5 can be more effectively prevented. Such a specific example is particularly suitable for application to a secondary battery (for example, a lithium ion battery) in which the internal pressure of the laminate exterior body 40 may increase due to gas generation from the electrolytic solution.

  In one specific example described above, the heat removal unit 52 is disposed apart from the heating unit 51. Therefore, on the exterior materials 41 and 42, the region where the heat removal unit 52 contacts and the region where the heating unit 51 contacts are separated. It is possible to prevent the heat removal unit 52 from being directly heated by contact with the heating unit 51. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas.

  In one specific example described above, the sealing device 50 further includes a cooling mechanism 54 for cooling the heat removal unit 52. Then, in the step of sealing the laminate exterior body 40, the heat removal unit 52 is cooled. Regions other than the regions (to be bonded) Aa of the exterior materials 41 and 42 to be sealed can be positively cooled via the heat removal unit 52. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas.

  In the specific example described above, the heat removal unit 52 includes a metal plate-shaped portion 52a that comes into contact with the exterior materials 41 and 42. Since the heat removal part 52 can contact the exterior materials 41 and 42 over a wide area, the temperature rise of the exterior materials 41 and 42 can be effectively suppressed. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas. Also, it is possible to effectively prevent wrinkles from occurring in the exterior materials 41 and 42 in the sealing step.

  In one specific example described above, the heat capacity of the plate portion 52a of the heat removal unit 52 is larger than the heat capacity of the region of the exterior materials 41 and 42 where the plate portion 52a contacts. Since the heat capacity of the heat removal unit 52 is large, it is possible to effectively suppress the temperature rise of the exterior materials 41 and 42. Thereby, it is possible to more effectively prevent the exterior materials 41 and 42 from adhering in unintended areas.

  Since the regions of the exterior members 41 and 42 in which the electrode body 5 and the electrolytic solution are stored have a three-dimensional shape, it is likely to be difficult for the heat removal unit 52 to come in contact with and absorb heat. On the other hand, according to the illustrated example, the heat removal unit 52 further includes a shielding unit 52b connected to the plate-shaped unit 52a, and the shielding unit 52b accommodates the electrode body 5 and the electrolyte of the exterior materials 41 and 42. The heated area is shielded from the heated area. Thereby, it is possible to effectively suppress an increase in the temperature of the region where the electrode bodies 5 and the electrolytic solution of the exterior materials 41 and 42 are accommodated.

  In the specific example described above, the heat removal unit 52 includes a pair of heat removal units, and the pair of heat removal units 52 contact the exterior materials 41 and 42 from both sides so as to sandwich the exterior materials 41 and 42 therebetween. By holding the laminate exterior body 40 between the pair of heat removal units 52, the posture of the exterior materials 41 and 42 can be stabilized, and the sealing step can be performed efficiently.

  Although one embodiment has been described with a plurality of specific examples, these specific examples are not intended to limit the embodiment. The above-described embodiment can be carried out in various other specific examples, and various omissions, replacements, and changes can be made without departing from the gist of the embodiment.

  For example, in one specific example described above, the sealing device 50 and the sealing method using the heat removal unit 52 are applied only to the sealing of the opening Z of the laminate exterior body 40. However, the present invention is not limited to this example. The sealing device 50 and the sealing method using the heat removal unit 52 may be applied to the formation of the three-sided adhesive regions Aa of the exterior body 40.

DESCRIPTION OF SYMBOLS 1 Laminated secondary battery 3 Tab 4 Seal material 5 Electrode body 10 First electrode plate 10X Positive electrode plate 20 Second electrode plate 20Y Negative electrode plate 30 Insulator 40 Laminated exterior body 41 First exterior material 42 Second exterior material 42a Swelling Section 42b Flange section 44 Metal layer 45 Sealant layer 50 Sealing device 51 Heating section 52 Heat removal section 521 Plate section 522 Shielding section 53 Heating mechanism 54 Cooling mechanism 55 Decompression chamber A1 Adhesive area Aa Adhesive area Z Opening Ax Island Welding area dz Stacking direction dx Extraction direction dy Width direction

Claims (19)

A laminate secondary battery having a laminate exterior body formed using an exterior material including a metal layer and a sealant layer laminated on the metal layer, and an electrode body and an electrolyte disposed in the laminate exterior body. A method of manufacturing,
A step of sealing the laminate exterior body by heating the exterior material of the laminate exterior body containing the electrode body and the electrolytic solution,
A step of sealing the opening, a step of contacting a heating unit with the exterior material, and a step of contacting a heat removal unit at a temperature lower than the heating unit with the exterior material, a laminated secondary battery Manufacturing method.   2. The laminate according to claim 1, wherein in the step of sealing the laminate exterior body, a step of contacting the heat removal unit with the exterior material is started before a step of contacting the heating unit with the exterior material. 3. Manufacturing method of a rechargeable secondary battery.   3. The step of sealing the laminate exterior body, wherein the step of bringing the heating unit into contact with the exterior material is completed before the step of bringing the heat removal unit into contact with the exterior material. 4. Of manufacturing a laminated secondary battery.   In the step of sealing the laminate exterior body, a step of contacting the heat removal unit with the exterior material is performed over the entire period in which the step of contacting the heating unit with the exterior material is performed. Item 4. The method for producing a laminated secondary battery according to any one of Items 1 to 3.   5. The heat removal unit according to claim 1, wherein the heat removal unit is in contact with a region between the region facing the electrode body and the region in contact with the heating unit, in the exterior material. 13. The method for producing a laminated secondary battery according to the above item.   The method for manufacturing a laminated secondary battery according to any one of claims 1 to 5, wherein the heat removal unit contacts a region including the sealant layer in the exterior material.   The method for manufacturing a laminate type secondary battery according to any one of claims 1 to 6, wherein the step of sealing the laminate exterior body is performed under a reduced pressure environment.   The method for manufacturing a laminated secondary battery according to any one of claims 1 to 7, wherein a region of the exterior material where the heat removal unit contacts and a region where the heating unit contacts are separated.   The method for manufacturing a laminated secondary battery according to any one of claims 1 to 8, wherein in the step of bringing the heat removal unit into contact with the exterior material, the heat removal unit is cooled. In the step of bringing the heating unit into contact with the exterior material, the heating unit is at least 120 ° C.
The method for manufacturing a laminated secondary battery according to any one of claims 1 to 9, wherein in the step of contacting the heat removal unit with the exterior material, the heat removal unit is at 80C or lower. A laminate type secondary battery having a laminate exterior body formed using an exterior material including a metal layer and a sealant layer laminated on the metal layer, and an electrode body and an electrolytic solution disposed in the laminate exterior body When manufacturing a sealing device for sealing the laminate body containing the electrode body and the electrolyte solution,
A heating unit that heats the exterior material in contact with a region to be sealed of the exterior material,
A heat removal unit having a lower temperature than the heating unit that is in contact with a region of the exterior material that is different from the region to be sealed.   The sealing device according to claim 11, further comprising: a decompression chamber containing the heating unit and the heat removal unit.   The sealing device according to claim 11, wherein the heat removal unit is disposed apart from the heating unit.   The sealing device according to any one of claims 11 to 13, further comprising a cooling mechanism that cools the heat removal unit.   The sealing device according to any one of claims 11 to 14, wherein the heating unit has a temperature of 120C or more, and the heat removal unit has a temperature of 80C or less.   The sealing device according to any one of claims 11 to 15, wherein the heat removal unit includes a metal plate-shaped portion that contacts the exterior material.   The sealing device according to claim 16, wherein a heat capacity of the plate-shaped portion is larger than a heat capacity of a region of the exterior material that contacts the plate-shaped portion.   The said heat removal part is further connected with the said plate-shaped part, and further contains the shielding part which shields the area | region which accommodated the said electrode body and the said electrolytic solution of the said exterior material from the said heating part, The Claim 16 or 17 characterized by the above-mentioned. Sealing device. The heat removal unit includes a pair of heat removal units,
The sealing device according to any one of claims 11 to 18, wherein the pair of heat removal units contact the exterior material from both sides so as to sandwich the exterior material therebetween.