JP5761576B2 - Multilayer battery and method for manufacturing multilayer electrode body - Google Patents

Description

  The present invention relates to a laminated battery used for, for example, an automobile battery, and more particularly to a laminated electrode body structure capable of high-speed lamination and a manufacturing method thereof.

  Generally, a lithium ion battery used in a hybrid vehicle, an electric vehicle, or the like is configured by enclosing an electrode in which a positive electrode and a negative electrode are stacked with a separator interposed between them and an electrolytic solution in a container. The multilayer electrode has a relatively simple configuration, and the capacity can be easily changed depending on the number of stacked layers.

  As a conventional technique, Patent Document 1 discloses a stacked lithium ion battery structure having a positive electrode plate package in which a positive electrode plate is sandwiched between continuous sheet-like separators. A positive electrode plate package is a product in which a predetermined number of positive electrode plates are sandwiched between continuous strip-shaped separators and arranged at predetermined intervals, and the separators located at the intermediate and bottom portions are heat-sealed. Produced in a sealing step for obtaining a positive electrode plate package by sealing, a bending step for bending this zigzag, a negative plate insertion step for inserting the negative plate from both sides, and a pressing step for obtaining a flat laminate by pressing. .

JP 2011-181395 A

  In putting lithium ion batteries into practical use, it is required to continuously manufacture stacked electrodes that are accurately stacked with a predetermined number of stacked layers. However, the conventional electrodes are laminated by cutting the positive electrode and / or the negative electrode one by one, and it takes time to put the electrodes one by one for continuous high-speed lamination. Further, since the separator is thin and light, it is likely to be displaced and difficult to handle.

  In this regard, Patent Document 1 is integrated in advance by supplying a separator as a strip to the line, sandwiching a predetermined number of positive electrode plates between the separators, and heat-sealing. In heat sealing, the separator intermediate portion between the positive electrode plate and the positive electrode plate is heated and pressed to heat-separate the separators. Since the positive electrode plate is sealed on three sides, positioning with respect to the separator is performed, and then the negative electrode plate can be inserted from both sides to form a laminate.

  However, since the heat-sealed portion is cured, it is difficult to fold it in a zigzag shape in the next step. For this reason, in Patent Document 1, two linear seal lines are formed across the center line between the positive electrode plates at the folding position, but folding becomes difficult when the two seal lines approach, Increasing the distance between the positive plates increases the size of the folded electrode. Further, it is necessary to control the line width and the line interval highly, and there is a risk that the apparatus and the process become complicated.

  Moreover, since the negative electrode plate is a monopolar plate, it takes time to handle and assemble after production. In Patent Document 1, a predetermined number of negative electrode plates are simultaneously inserted from both sides into a bent portion opening of a positive electrode plate package that is folded in a zigzag shape. It is not easy to press and make a laminated body without positional displacement.

  Therefore, the present invention establishes an electrode body structure that can be stacked at a high speed by improving positional accuracy and handleability when laminating a positive electrode and a negative electrode via a separator, and a battery performance that can be continuously laminated. It is an object of the present invention to provide a laminated battery having excellent resistance.

In order to solve the above problem, the invention according to claim 1 of the present invention provides:
A laminated battery having a laminated electrode body in which a positive electrode on which a positive electrode lead is formed and a negative electrode on which a negative electrode lead is formed are alternately stacked via a separator, wherein the laminated electrode body includes:
A negative electrode / separator pressure-bonded body in which a band-shaped negative electrode body is pressure-bonded between a pair of separators continuous in a band shape;
It consists of a positive electrode linking body in which a plurality of positive electrodes are connected to each other by a continuous positive electrode lead in a strip shape,
The negative electrode / separator pressure-bonded body has a crease inserted so that mountain folds and valley folds alternate between adjacent negative electrodes,
The positive electrode assembly is assembled so that the adjacent positive electrodes are alternately inserted on one side and the other side of the negative electrode / separator crimped body and face the negative electrode via the separator, and along the fold line. It is sandwiched between layers of the above-mentioned negative electrode / separator pressure-bonded body.

The separator of the negative electrode / separator pressure-bonded body has a ceramic layer on the surface of the separator substrate, and the negative electrode body serves as the negative electrode with one side edge of the strip-shaped negative electrode substrate as the negative electrode lead. A negative electrode active material layer is provided on the surface.

Further , in the negative electrode / separator pressure-bonded body, the ceramic particle diameter forming the ceramic layer is smaller than the particle diameter of the negative electrode active material layer.

In the invention according to claim 2 of the present invention, the negative electrode / separator pressure-bonded body uses an end edge of the negative electrode as a pressure-bonding portion, and the negative electrode active material layer on the negative electrode surface and the ceramic layer on the separator surface include: Crimped and integrated.

In the invention according to claim 3 of the present invention, the positive electrode coupling body is formed by cutting out a part of a belt-like positive electrode body, and the area of the positive electrode is smaller than the opposing negative electrode.

Invention of Claim 4 of this invention is a manufacturing method of the said laminated electrode body, Comprising:
A pressure bonding step in which a band-shaped negative electrode body is inserted between a pair of separators continuous in a band shape and pressed to form a negative electrode / separator pressure-bonded body;
Adjacent negative electrodes by alternately moving up and down a pair of upper and lower blades on the negative electrode / separator crimped body or by attaching a blade tool to a rotating body and continuously crimping and creasing A crease entering step for folds so that mountain folds and valley folds alternate in between,
A stripping step in which one side edge of the strip-shaped positive electrode body is used as a positive electrode lead, and a positive electrode having a predetermined shape is cut out at a predetermined interval on the other side edge portion side to form a positive electrode coupling body;
An assembly step of alternately inserting the positive electrode of the positive electrode continuum into one surface side and the other surface side of the negative electrode / separator pressure-bonded body;
And a laminating step of folding the negative electrode / separator crimped body along the crease.

  In the multilayer battery according to the first aspect of the present invention, the multilayer electrode body as the main part is configured by combining the negative electrode / separator crimp body and the positive electrode connector. In the negative electrode / separator crimped body, a thin separator that is difficult to handle is integrated with the negative electrode in advance and creased, so that handling is improved and folding along the crease enables high-speed lamination. Further, since both the positive electrode and the negative electrode are continuous, assembly and positioning are easy, and a positive electrode having a predetermined shape can be inserted into a predetermined position by using a fold between the negative electrodes, thereby improving positioning accuracy.

Therefore, the negative electrode / separator crimped body and the positive electrode coupling body are each a continuous body corresponding to the number of laminated layers, thereby realizing a laminated electrode body having a desired laminated structure while suppressing misalignment during lamination. A high performance stacked battery can be obtained. Specifically, the separator having a ceramic layer on the substrate surface is preferably used, in good crimp and negative electrode body constitutes a negative electrode separator crimp body, Ru to improve its handling properties.

At this time, it is preferable to select the electrode constituent material so that the particle size of the ceramic layer is smaller than the particle size of the negative electrode active material layer, and the anchor effect that the small ceramic particle size enters the gap between the negative electrode active material particles. , Ru can be brought into close contact with each other.
In particular, if the crimping part of the negative electrode / separator crimped body is set to the negative edge part, the positive electrode and the crimping part are avoided from facing each other, preventing the deterioration of battery performance and suppressing performance abnormalities such as short circuits. (Claim 2 ). The positive electrode connecting body so as to be smaller than the negative electrode area of the positive electrode are opposed, it can be easily formed by cutting out strip-shaped positive electrode body (claim 3).

Such a laminated electrode body can be manufactured by the method of claim 4 . That is, the negative electrode / separator crimped body integrated in the crimping process is creased in advance in the crease inserting process, and then assembled in the assembling process with the positive electrode connector formed in the cutting process. Here, the positive electrode coupling body can be easily formed into a continuous body by cutting out a positive electrode having a predetermined shape from the belt-like positive electrode body, leaving a positive electrode lead.

  In general, the electrode body is required to have a larger area of the negative electrode than the positive electrode, but in this cutting process, the positive electrode can be cut into an arbitrary size and formed into an easy-to-handle shape connected by the positive electrode lead. . In addition, the gap between the positive electrodes facilitates assembly and positioning with the negative electrode / separator pressure-bonding body, and thereafter, when folding is performed in the stacking step, it is possible to continuously stack while suppressing displacement. Therefore, it becomes possible to manufacture a high-quality laminated electrode body continuously at high speed.

BRIEF DESCRIPTION OF THE DRAWINGS It is 1st Embodiment of this invention, and is the schematic which shows the laminated electrode body structure which is the principal part of a laminated battery, and its manufacturing method. It is a perspective view which shows the detailed structure of a laminated electrode body. It is a perspective view which shows the whole structure of the lithium ion battery which is a product example using a laminated electrode body and is a laminated type battery. It is a figure which shows typically the lamination example of a laminated electrode body. It is an expanded sectional view which shows the detailed structure of the positive electrode, separator, and negative electrode which comprise a laminated electrode body. It is a schematic diagram for demonstrating the crimping | compression-bonding structure of a separator and a negative electrode body. It is a figure which compares and shows the size and arrangement | positioning of the positive electrode which comprises a laminated electrode body, a separator, and a negative electrode. It is a top view which shows an example of the crimping | compression-bonding structure of a separator and a negative electrode body. It is sectional drawing which shows an example of the crimping | compression-bonding structure of a separator and a negative electrode body. It is a schematic diagram for demonstrating the crimping | compression-bonding mechanism of a negative electrode and separator crimping body. It is a schematic diagram for demonstrating the mechanism of non-crimping a positive electrode and a separator. It is process drawing for manufacturing the laminated electrode body of 1st Embodiment.

  Hereinafter, a first embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 shows an outline of a method for producing a laminated electrode body constituting the laminated battery of the present invention, and FIG. 2 shows a laminated structure of the laminated electrode body. FIG. 3 shows a lithium ion battery structure as a stacked battery. In FIG. 3, the lithium ion battery is formed by enclosing an electrode body E as a laminated electrode body and an electrolytic solution S in a container C composed of a laminate film F. The electrode body E has a square shape in which the positive electrode 1, the separator 2, and the negative electrode 3 are alternately stacked. The positive electrode 1 and the negative electrode 3 are connected to the positive electrode terminal 1b and the negative electrode terminal 3b that protrude outward from the container C. ing. The positive electrode terminal 1b is composed of, for example, a strip-shaped aluminum plate (Al), and the negative electrode terminal 3b is composed of, for example, a strip-shaped copper plate (Cu), and is disposed on one end side and the other end side in the longitudinal direction of the container C, respectively. Is done.

  As shown in FIG. 2, the electrode body E is configured by combining the negative electrode / separator pressure-bonding body 4 and the positive electrode connector 5 and folding it in a bellows shape. The negative electrode / separator pressure-bonding body 4 is formed by sandwiching a negative electrode body 31 having a rectangular flat metal foil as a negative electrode base material between the separators 2 and press-bonding them together. Thus, the negative electrode 3 is formed. The metal foil portion exposed to the side of the separator 2 forms the negative electrode lead 3a.

  The positive electrode coupling body 5 is composed of a positive electrode body 11 having a rectangular flat metal foil as a positive electrode base material, and a positive electrode active material is applied to a surface inserted between the separator 2 and the negative electrode 3 to form the positive electrode 1. doing. The metal foil portion exposed to the side of the separator 2 forms the positive electrode lead 1a. The positive electrode lead 1a and the negative electrode lead 3a are located on opposite sides of the separator 2, and are laminated and integrated, respectively, and connected to the positive electrode terminal 1b and the negative electrode terminal 3b in FIG.

  FIG. 1 shows details of the negative electrode / separator pressure-bonding body 4 and the positive electrode connector 5 constituting the electrode body E, and a procedure for assembling and laminating the negative electrode / separator pressure-bonding body 4 and the positive electrode connector 5. Hereinafter, it demonstrates in order by (1)-(4). In (1), the negative electrode / separator pressure-bonding body 4 is formed by pressure-bonding a band-shaped negative electrode body 31 between a pair of separators 2 that are continuous in a band shape, and the whole is a band-shaped continuous body. The negative electrode / separator pressure-bonding body 4 has folds that are preliminarily placed between adjacent negative electrodes 3 such that mountain folds and valley folds are alternated, and is easy to assemble and fold.

  The positive electrode connecting body 5 is a continuous body in which a plurality of positive electrodes 1 are connected to each other by a positive electrode lead 1a that is continuous in a strip shape. Such a positive electrode coupling body 5 can be formed by cutting out from the belt-like positive electrode body 11 into a predetermined shape of the positive electrode 1, leaving one side edge portion to be the positive electrode lead 1a. Thereby, it becomes the shape connected with the clearance gap between the adjacent positive electrodes 1, manufacture and handling become easy, and it can assemble | attach each positive electrode 1 with the negative electrode / separator crimping | compression-bonding body 4 easily.

  In (2), in the positive electrode continuum 5, the adjacent positive electrodes 1 are alternately inserted on one surface side (upper surface side in the figure) and the other surface side (lower surface side in the figure) of the negative electrode / separator crimping body 4. Is done. Since the positive electrode continuum 5 and the negative electrode / separator pressure bonding body 4 are both integrated, handling is easy, and the cut-out positive electrode 1 is passed through the separator with respect to the adjacent negative electrode 3 partitioned by a fold. The negative electrode 3 can be reliably opposed to the negative electrode 3.

  (3) shows a state after assembly. The positive electrodes 1 are alternately arranged on the front side and the back side with respect to the longitudinal direction of the negative electrode 3. In (4), this assembly is folded along the folds of the negative electrode / separator crimping body 4 to form the electrode body E. As shown in the drawing, the positive electrode 1 of the positive electrode continuum 5 is inserted and sandwiched between the negative electrode / separator pressure-bonded body 4 folded in a bellows shape in the laminated body to be the electrode body E. The individual positive electrodes 1 are integrated by a positive electrode lead 1a extending to one end side of the separator, and are positioned and restricted in movement, so that there is no possibility of displacement or the like.

  Therefore, not only is it necessary to cut out and store one by one like a monopolar plate but store them individually and to assemble them, and handling during folding after assembly is also easy. For this reason, in order to increase the capacity, it is possible to obtain an electrode body E that is stacked with high positional accuracy even in a configuration in which the number of stacked layers is increased.

  FIG. 4A schematically shows a stacking example of the electrode body E. The negative electrodes 3 and the positive electrodes 1 sandwiched between the separators 2 are alternately arranged, and a necessary number of sheets are overlapped so as to have a predetermined capacity. Here, a set of a negative electrode 3: 1 sheet, a separator 2: 2 sheet, and a positive electrode 1: 1 sheet is formed as a single layer, which is laminated in a vertical direction with a predetermined layer (for example, 25 layers), and further on the lowermost layer, a separator 2 Add As a result, the number of separators 2 is 51.

  FIG. 4B shows a structural example of the positive electrode body 11, the negative electrode body 31, and the separator 2 constituting the electrode body E. The positive electrode 1 and the negative electrode 3 are each coated with an electrode active material on the surface of a thin metal material. It has a known configuration. Specifically, the positive electrode body 11 uses, for example, a metal foil such as aluminum (Al) as a base material, and the positive electrode active material layers 12 are formed on both surfaces of the base material except for a portion that becomes the positive electrode lead 1a. The positive electrode body 11 has a continuous belt shape, and a portion where the positive electrode active material layer 12 is formed is cut out in a predetermined shape to form a large number of positive electrodes 1 connected to each other by the positive electrode lead 1a (see FIG. 1 (1)).

As the positive electrode active material, for example, an oxide-based material such as LiCoO ₂ is preferably used. Specifically, a slurry containing positive electrode active material particles (for example, a particle size of about 0.5 μm) and a binder is prepared, applied to both surfaces of a metal foil serving as a base material of the positive electrode body 11, and dried. At this time, a non-application region is formed with a predetermined width on one side edge side (right side in the figure) to form the positive electrode lead 1a. The thickness of the positive electrode body 11 is, for example, about 0.20 mm.

  The negative electrode body 31 uses, for example, a metal foil such as copper (Cu) as a base material, and a negative electrode active material layer 32 is formed on both surfaces of the base material except for a portion to be the negative electrode lead 3a. A large number of negative electrodes 3 having a predetermined shape are formed by folding the negative electrode body 31 at predetermined intervals (see FIG. 1A). As the negative electrode active material, for example, carbon is suitably used. In addition, silicon, Sn alloy, Al alloy, etc. can also be used for the negative electrode active material.

  Then, a slurry containing negative electrode active material particles (for example, a particle size of about 15 μm) and a binder is prepared, applied to both surfaces of the metal foil serving as the base material of the negative electrode body 31, and dried. At this time, a non-application region is formed with a predetermined width on one side edge side (right side in the figure) to form the negative electrode lead 3a. The thickness of the negative electrode body 31 is, for example, about 0.15 mm.

  The separator 2 is made of, for example, a strip of porous thin film made of a synthetic resin such as polyphenylene sulfide (PPS). Preferably, the separator 2 in which the thin film-like ceramic layers 21 are formed on both surfaces of the porous thin film is used, and the insulation and strength are improved, and the adhesion of the negative electrode / separator crimped body 4 is improved as described later. Increase. The ceramic layer 21 is made of insulating ceramic particles such as silica. The width of the separator 2 is smaller than that of the positive electrode body 11 and the negative electrode body 31, whereby the positive electrode lead 1a and the negative electrode lead 3a are exposed to the sides. The thickness of the separator 2 is, for example, about 0.02 mm.

  The constituent materials of these electrode bodies E are all thin and soft materials, and in particular, the separator 2 is a thin film-like lightweight material, so that it is difficult to handle. In addition, the position is likely to be displaced by a minute force, which may lead to abnormal battery performance such as a short circuit after lamination. Therefore, in the present invention, the negative electrode / separator crimped body 4 in which the negative electrode 3 and the separator 2 are integrated in advance is used. As shown in FIG. 4C, the negative electrode / separator pressure-bonding body 4 is obtained by disposing the band-shaped separators 2 on both surfaces of the band-shaped negative electrode body 31 and pressing them with a press or the like.

  Here, the arrangement | positioning detail of the separator 2 and both the electrodes 1 and 3 is shown in FIG. FIG. 5A shows a comparison of the sizes of the components after lamination, and the area of the positive electrode 1 (the coated surface of the positive electrode active material) is smaller than the area of the negative electrode 3 (the coated surface of the negative electrode active material). This is a characteristic required to prevent an internal short circuit or the like caused by a battery reaction. For this reason, the positive electrode 1 is substantially the same shape as the negative electrode 3 and is cut out to be slightly smaller. In the laminated state in which the separator 2 is folded with the positive electrode 1 and the negative electrode 3 inside, both the length between the creases (the horizontal direction in the figure) and the length between both side edges (the vertical direction in the figure) are both electrodes. It is larger than the (electrode active material coating surface), and the two electrodes are reliably insulated and separated. The length between both side edges is smaller than the positive electrode body 11 including the positive electrode lead 1a and the negative electrode body 31 including the negative electrode lead 3a, and the positive electrode lead 1a and the negative electrode lead 3a can be exposed.

  5B and 5C are examples of the crimping positions of the separator 2 and the negative electrode 3. The negative electrode body 31 presses the opposite edge portions of the negative electrode 3 (the coated surface of the negative electrode active material) from above and below along both side edge portions of the separator 2 to form a band-shaped pressure-bonding surface. The crimping portion is outside the portion where the positive electrode 1 (coating surface of the positive electrode active material) is disposed, and a surface where the positive and negative electrodes do not overlap and a surface where the positive and negative electrodes overlap each other are formed. In this way, the positive electrode 1 is not opposed to the crimping surface, and the area of the negative electrode 3 that substantially functions is larger than the area of the positive electrode 1, thereby preventing a decrease in electrode performance.

  FIG. 6A shows a pressure bonding mechanism of the negative electrode / separator pressure-bonding body 4. A ceramic layer 21 made of fine ceramic particles 21a (for example, about φ0.2 to 1 μm) is formed on the surface of the separator 2, and a negative electrode active material 32a (for example, about φ15 μm) is formed on the opposing negative electrode 3 surface. A negative electrode active material layer 32 is formed. Here, when the opposing surfaces of the separator 2 and the negative electrode 3 are pressed by a press or the like, the fine ceramic particles 21a enter the gaps of the negative electrode active material 32a having a relatively large particle size. Due to this anchor effect, strong pressure bonding is possible, and the negative electrode / separator pressure body 4 can be obtained.

  On the other hand, in FIG. 6B, when the positive electrode 1 is used instead of the negative electrode 3, the separator 2 is not crimped. This is because, in the positive electrode active material layer 12 on the surface of the positive electrode 1, the positive electrode active material 12 a (for example, about φ0.15 μm) is smaller and harder than the ceramic particles 21. Therefore, it is presumed that the anchor effect cannot be expected.

  Thus, in the present invention, the negative electrode / separator pressure-bonding body 4 and the positive electrode coupling body 5 are manufactured in advance, thereby improving the handleability. Further, since the negative electrode / separator crimped body 4 is not joined by heat fusion or the like as in the prior art, it is not necessary to heat-seal while highly controlling the joining portion, and the foldable portion is not limited. Therefore, it is possible to stack the positive electrode assemblies 5 while continuously folding them without complicating the device configuration.

  FIG. 7 shows a schematic configuration of such an apparatus, and a laminated electrode body E is manufactured in a continuous process. First, in the crimping step, the separator 2 and the negative electrode 3 are pressure-bonded by feeding between the pair of rotating rollers 6 while inserting the strip-shaped negative electrode body 31 between the pair of strip-shaped separators 2. At this time, as described above, the pressure-bonding surface is formed in a band shape along the opposing side edge portions of the negative electrode 3, and the negative electrode / separator pressure-bonded body 4 is formed.

  The crimping position does not need to be a continuous band, and may be crimped in any way as long as the adhesion between the separator 2 and the negative electrode 3 is ensured. For example, in order to perform partial pressure bonding, a pressure-bonding portion having a dotted line shape or a broken line shape can be formed under jurisdiction by pressing with a roller having protrusions or convex portions on the outer periphery.

  In the subsequent folding process, the negative electrode / separator crimping body 4 alternately moves up and down a pair of upper and lower blade tools 7 or attaches the blade tool to a rotating body and continuously crimps and creases. By doing so, folds that are alternately mountain-folded or valley-folded at predetermined intervals are formed. On the other hand, the positive electrode body 11 is subjected to a positive electrode cutting step, and is cut into a predetermined positive electrode 1 shape using a punching die or the like, whereby the positive electrode connector 5 is formed. The negative electrode / separator crimped body 4 and the positive electrode connector 5 are cut with a cutter or the like (not shown) so as to have a length corresponding to a desired number of layers.

  Next, in the positive electrode / negative electrode assembly step, the positive electrode 1 of the positive electrode connector 5 is inserted while the negative electrode / separator pressure-bonding body 4 is conveyed between the pair of belts 81. At this time, the adjacent positive electrodes 1 are alternately positioned on the upper surface or the lower surface of the negative electrode / separator pressure-bonding body 4 so as to face the negative electrode 3 through the separator 2. Since the negative electrode / separator crimping body 4 has a crease between the negative electrodes in advance, the positive electrode 1 can be inserted and positioned with high accuracy. Furthermore, after conveying between a pair of belts 82 and pressing and arranging the assembly from above and below, it is folded along the crease in the laminating step to form an electrode body E.

  In this way, the positive electrode body 11, the separator 2, and the negative electrode body 31 are sequentially conveyed to the crimping process, the crease forming process, and the positive electrode cutting process, so that they can be easily assembled and the battery characteristics are required. Can be obtained. Furthermore, the obtained negative electrode / separator pressure-bonded body 4 and positive electrode connector 5 can be stacked continuously at a high speed by the positive electrode / negative electrode assembly step and the stacking step.

  The laminated battery having the laminated electrode body of the present invention is not limited to a lithium ion battery or the like used for an electric vehicle or the like, but can be used for various applications such as industrial and household storage batteries in which the laminated battery can be used. It has excellent practicality as a high-performance battery with high capacity, and has high industrial utility value.

E Electrode body (Laminated electrode body)
DESCRIPTION OF SYMBOLS 1 Positive electrode 11 Positive electrode body 1a Positive electrode lead 2 Separator 3 Negative electrode 31 Negative electrode body 3a Negative electrode lead 4 Negative electrode and separator crimping body 5 Positive electrode coupling body

Claims (4)

A laminate having a laminated electrode body (E) in which a positive electrode (1) on which a positive electrode lead (1a) is formed and a negative electrode (3) on which a negative electrode lead (3a) is formed are alternately stacked via a separator (2). The laminated electrode body is a type battery,
A negative electrode / separator pressure-bonded body (4) in which a band-shaped negative electrode body (31) is pressure-bonded between a pair of separators that are continuous in a band shape;
A positive electrode assembly (5) in which a plurality of positive electrodes are connected to each other by a positive electrode lead continuous in a strip shape,
The negative electrode / separator pressure-bonded body has a crease inserted so that mountain folds and valley folds alternate between adjacent negative electrodes,
The positive electrode assembly is assembled so that the adjacent positive electrodes are alternately inserted on one side and the other side of the negative electrode / separator crimped body and face the negative electrode via the separator, and along the fold line. It is sandwiched between the layers of the negative electrode / separator crimped body folded ,
The separator of the negative electrode / separator crimped body has a ceramic layer (21) on the surface of the separator substrate, and the negative electrode body has one side edge of the strip-shaped negative electrode substrate as the negative electrode lead, A negative electrode active material layer (32) on the surface,
The negative electrode / separator pressure-bonded body has a ceramic particle diameter forming the ceramic layer smaller than the particle diameter of the negative electrode active material layer . The negative electrode separator crimp body, the edge portion of the negative electrode and the crimp portion, a negative electrode active material layer of the negative electrode surface, and a ceramic layer of the separator surface, is crimped according to claim 1, characterized in that together Laminated battery. The stacked battery according to claim 2 , wherein the positive electrode assembly is formed by cutting out a part of a strip-like positive electrode body (11), and the area of the positive electrode is smaller than the opposing negative electrode. The method for producing the laminated electrode body according to any one of claims 1 to 3 ,
A pressure bonding step in which a band-shaped negative electrode body is inserted between a pair of separators continuous in a band shape and pressed to form a negative electrode / separator pressure-bonded body;
Adjacent negative electrodes by alternately moving up and down a pair of upper and lower blades on the negative electrode / separator crimped body or by attaching a blade tool to a rotating body and continuously crimping and creasing A crease entering step for folds so that mountain folds and valley folds alternate in between,
A stripping step in which one side edge of the strip-shaped positive electrode body is used as a positive electrode lead, and a positive electrode having a predetermined shape is cut out at a predetermined interval on the other side edge portion side to form a positive electrode coupling body;
An assembly step of alternately inserting the positive electrode of the positive electrode continuum into one surface side and the other surface side of the negative electrode / separator pressure-bonded body;
And a lamination step of folding the negative electrode / separator crimped body along the crease.

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