JP2013093291A - battery - Google Patents

Abstract

Provided is a battery capable of reducing a useless space generated around a connection portion between current collectors and increasing a volume energy density.
A battery 100 includes a stacked body 50a, 50b in which a plurality of electrode bodies 10 are stacked, and each of the plurality of electrode bodies includes a current collector 12, and the current collector includes: The batteries are bent in one direction of the stacking direction of the electrode bodies and connected to each other.
[Selection] Figure 1

Description

  The present invention relates to a battery including a laminated body in which a plurality of electrode bodies are laminated.

  A lithium ion secondary battery has the characteristics that it has a higher energy density than other secondary batteries and can operate at a high voltage. Therefore, lithium ion secondary batteries are used in information devices such as mobile phones as secondary batteries that are easy to reduce in size and weight. In recent years, the demand for lithium ion secondary batteries has also increased for powering large equipment such as electric vehicles and hybrid vehicles.

  A lithium ion secondary battery includes a positive electrode layer and a negative electrode layer, and an electrolyte layer disposed therebetween. As an electrolyte used for the electrolyte layer, for example, a non-aqueous liquid or solid substance is known. A liquid electrolyte (hereinafter referred to as “electrolytic solution”) easily penetrates into the positive electrode layer and the negative electrode layer. Therefore, when the electrolytic solution is used, the interface between the active material contained in the positive electrode layer or the negative electrode layer and the electrolyte is easily formed, so that the battery performance is easily improved. However, since the widely used electrolyte is flammable, it is necessary to mount a system for ensuring safety. On the other hand, when a solid electrolyte that is flame retardant (hereinafter referred to as “solid electrolyte”) is used, the above system can be simplified. Therefore, a lithium ion secondary battery (hereinafter referred to as “all-solid lithium battery”) in a form provided with a layer containing a solid electrolyte that is nonflammable (hereinafter referred to as “solid electrolyte layer”) is proposed. Has been.

  As a technique applicable to such a battery, for example, Patent Document 1 discloses that each battery includes a) a pair of sheet-like electrodes, b) an electrolyte between the electrodes, and c) at least one sheet-like electrode. A plurality of batteries comprising a sheet of current collecting elements having a pair of generally opposed major surfaces protruding from an electrode and electrically connected to the at least one sheet-like electrode; The plurality of batteries are configured in a stacked type such that each sheet-like current collecting element of each battery is parallel to and opposite to the main surface of each sheet-like current collecting element, and has a pair of arms. One current collecting terminal has its arms spaced apart from each other and defines a recess for receiving a sheet-like current collecting element therebetween, each of the arms being a member of one of the sheet-like current collecting elements. Overlapping the at least part of the main surface, the current collecting element is the current collecting end Electrochemical including being electrically connected (EC) cell bundle is disclosed in.

JP 2005-528741 A

  According to Patent Document 1, an EC battery bundle can be formed by a simple and cost-effective method. However, in the technique described in Patent Document 1, when the sheet-like current collecting elements (current collectors) are connected to each other, useless space around the connection portion increases. Therefore, the technique described in Patent Document 1 has a problem that it is difficult to increase the volume energy density of the battery.

  Therefore, an object of the present invention is to provide a battery that can reduce a useless space generated around a connection portion between current collectors and increase volume energy density.

In order to solve the above problems, the present invention has the following configuration. That is,
A first aspect of the present invention is a battery including a stacked body in which a plurality of electrode bodies are stacked, and each of the plurality of electrode bodies includes a current collector, and each of the current collectors is The batteries are bent in one direction of the stacking direction of the electrode bodies and connected to each other.

  In the present invention, the “stacking direction of electrode bodies” is a concept that includes not only the direction in which layers are actually stacked but also the opposite direction. For example, if the electrode bodies are sequentially stacked in the upward direction, the stacking direction of the electrode bodies means the vertical direction. Therefore, in this case, “one direction in the stacking direction of the electrode bodies” means an upward direction or a downward direction.

  By bending and connecting the current collectors in the stacking direction of the electrode bodies as described above, the space required for connecting the current collectors can be reduced. Therefore, the battery which can raise a volume energy density can be provided by setting it as this form.

  In the battery according to the first aspect of the present invention, each of the current collectors includes a bent portion bent in one direction of the stacking direction of the electrode bodies, and the plurality of electrode bodies are stacked so that the bent portions are in contact with each other. It is preferable to be made.

  In the present invention, the “curved portion bent in one direction of the electrode body stacking direction” means a portion of the current collector that extends in the electrode body stacking direction.

  As described above, by laminating a plurality of electrode bodies so that the curved portions are in contact with each other, it is easy to prevent the position of the electrode bodies from being shifted when laminating the electrode bodies.

  A second aspect of the present invention is a battery including a laminate in which a plurality of electrode bodies are laminated, each of the plurality of electrode bodies including a current collector, and the plurality of electrode bodies are electrodes. A first electrode body including a current collector bent in one direction of the body stacking direction, and a second electrode body including a current collector bent in the other direction of the electrode body stacking direction. The battery is configured such that the current collectors of the first electrode bodies are connected to each other, and the current collectors of the second electrode bodies are connected to each other.

  By providing the current collectors bent in different directions as described above, it is possible to connect the current collectors at positions that do not protrude from the laminate in the stacking direction of the laminate, as will be described in detail later. it can. Therefore, the volume energy density of the battery can be further increased. Moreover, it becomes easy to prevent that the connection part of collectors damages the exterior material which accommodates a laminated body.

  In the battery according to the second aspect of the present invention, the current collector of the first electrode body and the current collector of the second electrode body may be not connected to each other, and are connected to each other. You can also

  Further, in the battery according to the second aspect of the present invention, each of the current collectors includes a bent portion bent in the stacking direction of the electrode bodies, and the plurality of electrode bodies are stacked so that the bent portions are in contact with each other. It is preferable to become.

  As described above, by laminating a plurality of electrode bodies so that the curved portions are in contact with each other, it is easy to prevent the position of the electrode bodies from being shifted when laminating the electrode bodies.

  ADVANTAGE OF THE INVENTION According to this invention, the battery which can reduce the useless space produced around the connection part of collectors and can raise a volume energy density can be provided.

1 is a cross-sectional view schematically showing a battery 100. FIG. FIG. 5 is a diagram illustrating a manufacturing process of battery 100. 6 is a diagram illustrating another manufacturing process of the battery 100. FIG. 2 is a cross-sectional view schematically showing a battery 200. FIG. 3 is a diagram schematically showing an electrode body provided in a battery 200. FIG. 5 is a perspective view illustrating a manufacturing process of battery 200. FIG. It is sectional drawing which showed the conventional battery 500 schematically.

  FIG. 7 is a cross-sectional view schematically showing a conventional battery 500. As shown in FIG. 7, the battery 500 includes two stacked bodies 550 in which a plurality of electrode bodies 510 are stacked and connected in parallel. Moreover, the two laminated bodies 550 are laminated | stacked via the insulating member 530, and are connected in series. In the stacked body 550, the current collector 511 provided in the electrode body 510 is connected to the terminal 513, and the current collector 512 is bundled and connected at the connection portion 514. In such a battery 500, in the cross section shown in FIG. 7, a plurality of current collectors 512 are formed substantially linearly from the stacked body 550 toward the connection portion 514, respectively. Therefore, the space S1 required for connecting the current collectors 512 to each other in the exterior material 520 is widened, and a lot of useless space is generated in the exterior material 520. In such a conventional battery, if the current collector is simply shortened in order to reduce the space required to connect the current collectors, the current collector at the end in the stacking direction is used when connecting the current collectors. There was a possibility that the desired performance could not be obtained due to being cut by being pulled. As described above, the conventional battery has a problem that it is difficult to increase the volumetric energy density because there is a lot of wasted space generated around the connection portion between the current collectors.

  Note that a method of connecting current collectors by inserting a plurality of current collectors into grooves of a conductive member having a comb-like cross section (for example, JP-A-6-267529) is also conceivable. In addition, it is technically difficult to insert a plurality of current collectors into the comb-shaped conductive member, which is not practical.

  The present invention has been made in view of the above problems, and according to the present invention, a battery capable of increasing the volumetric energy density by reducing the useless space generated around the connection portion between the current collectors is provided. can do. Hereinafter, the battery of the present invention will be described with reference to the drawings. Each drawing is simplified by changing the scale and the like as appropriate for the convenience of illustration and understanding. In addition, some of the reference numerals are omitted for repetitive configurations, and the same configurations are denoted by the same reference numerals, and detailed description may be omitted. In addition, the form shown below is an illustration of this invention and this invention is not limited to the form shown below.

  FIG. 1 is a cross-sectional view schematically showing a battery 100 according to the first embodiment. As shown in FIG. 1, the battery 100 includes stacked bodies 50 a and 50 b in which a plurality of electrode bodies 10 are stacked, and an exterior material 20 that houses the stacked bodies 50 a and 50 b. Each of the plurality of electrode bodies 10 includes a current collector 12, and each of the current collectors 12 is one direction (upward direction in FIG. 1) in the stacking direction of the electrode bodies 10 (up and down direction in FIG. 1). ) And are connected to each other at the connecting portion 14. Moreover, in the exterior material 20, the laminated bodies 50a and 50b are laminated | stacked via the insulating member 30, and are connected in series.

  The electrode body 10 includes a current collector 11 and a current collector 12. The current collector 11 and the current collector 12 are distinguished depending on whether they are current collectors connected to terminals or current collectors connecting the stacked body 50a and the stacked body 50b. That is, the current collector connected to the terminal 13a in the stacked body 50a and the current collector connected to the terminal 13b in the stacked body 50b are referred to as the current collector 11, and the current collector connected to the connecting portion 14 is the current collector. 12

  One of the terminals 13a and 13b is a positive terminal and the other is a negative terminal. One of the current collector 11 and the current collector 12 is a positive electrode current collector, and the other is a negative electrode current collector. Hereinafter, the terminal 13a will be described as a positive terminal and the terminal 13b will be described as a negative terminal. Therefore, in the stacked body 50a, the current collector 11 is a positive electrode current collector, and the current collector 12 is a negative electrode current collector. In the laminated body 50b, the current collector 12 is a positive electrode current collector, and the current collector 11 is a negative electrode current collector. However, when it is not necessary to distinguish between the positive terminal and the negative terminal, the positive terminal and the negative terminal may be simply referred to as terminals. When there is no need to distinguish between a positive electrode current collector and a negative electrode current collector, the positive electrode current collector and the negative electrode current collector may be simply referred to as current collectors.

The plurality of negative electrode current collectors 12 provided in the laminated body 50a are bent portions 12a (see FIG. 2B) bent in one direction of the lamination direction of the electrode body 10 (see FIG. 2B). The structure of the current collector 12 is substantially the same).
In the laminated body 50a, a plurality of electrode bodies 10 are laminated such that the curved portion 12a of the negative electrode current collector 12 is in contact therewith. Further, the negative electrode current collectors 12 bent in the same direction are bundled and connected at the connection portion 14, and a plurality of electrode bodies 10 are connected in parallel in the stacked body 50 a. The plurality of positive electrode current collectors 12 provided in the stacked body 50 b have a curved portion 12 a (see FIG. 2B) bent in one direction in the stacking direction of the electrode body 10.
In the stacked body 50b, a plurality of electrode bodies 10 are stacked such that the curved portion 12a of the positive electrode current collector 12 is in contact therewith. Further, the positive electrode current collectors 12 bent in the same direction are bundled and connected at the connection portion 14, and a plurality of electrode bodies 10 provided in the stacked body 50b are connected in parallel. Thus, the negative electrode current collector 12 provided in the laminated body 50a and the positive electrode current collector 12 provided in the laminated body 50b are connected in a bundle at the connecting portion 14, and the electrode body provided in the laminated body 50a. 10 and the electrode body 10 provided in the laminated body 50b are connected in series.

  According to the battery 100, as described above, by connecting the current collectors 12 bent in the stacking direction of the electrode bodies 10 together, the space S2 required for connecting the current collectors 12 can be reduced. it can. That is, according to the battery 100, it is possible to reduce the useless space generated around the connection portion 14 between the current collectors 12 and increase the volume energy density.

  Although FIG. 1 illustrates a form in which the current collector 12 is bent at approximately 90 degrees in a cross-sectional view, the present invention is not limited to such a form. In the battery of the present invention, the current collectors that are bundled and connected may be bent in the stacking direction of the electrode bodies. That is, in the present invention, the current collector included in the electrode body is bent so as to be bent in the stacking direction of the electrode body (for example, so as to be lonely in a cross-sectional view in the same direction as the cross section shown in FIG. It may be. However, it is preferable to bend the current collector so as to be approximately 90 degrees in a cross-sectional view as shown in FIG. 1 from the viewpoint of reducing a useless space generated around the connection portion between the current collectors.

  Next, an example of a method for manufacturing such a battery 100 will be described. FIG. 2 is a diagram illustrating a manufacturing process of the battery 100, and FIG. 3 is a diagram illustrating another manufacturing process of the battery 100. 2A and 2B, the upper diagram is a perspective view, and the lower diagram is a cross-sectional view. Moreover, Fig.3 (a) and FIG.3 (b) are sectional drawings. The manufacturing process of the battery 100 is in the order shown in FIGS. 2A, 2B, 3A, and 3B.

  First, the electrode body 10 provided in the multilayer body 50b as shown in FIG. The electrode body 10 includes a negative electrode current collector 11, a negative electrode layer 1, a positive electrode layer 3, a solid electrolyte layer 2 sandwiched between the negative electrode layer 1 and the positive electrode layer 3, and a positive electrode current collector 12. . The negative electrode layer 1 is connected to the negative electrode current collector 11, and the positive electrode layer 3 is connected to the positive electrode current collector 12.

  The electrode body 10 can be manufactured through the following steps, for example. The electrode body 10 is produced by laminating each layer such that the solid electrolyte layer 2 is disposed between the positive electrode layer 3 and the negative electrode layer 1. The positive electrode layer 3 can be prepared, for example, through a process in which a positive electrode composition prepared by dispersing at least a positive electrode active material and a solid electrolyte in a solvent is applied to the surface of the positive electrode current collector 12. The negative electrode layer 1 can be prepared, for example, through a process in which a negative electrode composition prepared by dispersing a negative electrode active material and a solid electrolyte in a solvent is applied to the surface of the negative electrode current collector 11. The solid electrolyte layer 2 can be produced, for example, through a process in which an electrolyte composition produced by dispersing a solid electrolyte in a solvent is applied to the surface of the positive electrode layer 3. When the solid electrolyte layer 2 is thus prepared, the negative electrode current collector is formed on the solid electrolyte layer 2 formed on the surface of the positive electrode layer 3 so that the solid electrolyte layer 2 is sandwiched between the positive electrode layer 3 and the negative electrode layer 1, for example. The electrode body 10 can be manufactured through a process of laminating the negative electrode layer 1 formed on the surface 11 and applying a compressive force from both ends in the laminating direction.

As the positive electrode active material contained in the positive electrode layer 3, a known positive electrode active material that can be contained in the positive electrode layer of the lithium ion secondary battery can be appropriately used. As such a positive electrode active material, a layered compound such as lithium cobaltate (LiCoO ₂ ) can be exemplified. The positive electrode layer 3 can appropriately contain a known solid electrolyte that can be contained in the positive electrode layer of the lithium ion secondary battery. Such solid electrolyte, _Li 3 PO ₄ addition of the oxide-based solid electrolytes such as, _Li 3 PS _{4 and, Li 2 S: P 2 S} 5 = 50: 50~100: 0 become as Li ₂ A sulfide-based solid electrolyte prepared by mixing S and P ₂ S ₅ (for example, mixing Li ₂ S and P ₂ S ₅ so that the molar ratio is Li ₂ S: P ₂ S ₅ = 75: 25) Examples thereof include a sulfide solid electrolyte produced in the above manner. In addition, the positive electrode layer 3 may contain a binder that binds the positive electrode active material and the solid electrolyte and a conductive material that improves conductivity. Examples of the binder that can be contained in the positive electrode layer 3 include butylene rubber, and examples of the conductive material that can be contained in the positive electrode layer 3 include carbon black. Moreover, when producing the positive electrode layer 3, a known solvent that can be used when adjusting the slurry used when producing the positive electrode layer of the lithium ion secondary battery can be appropriately used. As such a solvent, heptane and the like can be exemplified.

  As the negative electrode active material contained in the negative electrode layer 1, a known negative electrode active material that can be contained in the negative electrode layer of the lithium ion secondary battery can be appropriately used. Examples of such a negative electrode active material include graphite. The negative electrode layer 1 can contain a solid electrolyte, and can appropriately contain a known solid electrolyte that can be contained in the negative electrode layer of the lithium ion secondary battery. Examples of such a solid electrolyte include the solid electrolyte that can be contained in the positive electrode layer 3. In addition, the negative electrode layer 1 may contain a binder that binds the negative electrode active material and the solid electrolyte and a conductive material that improves conductivity. Examples of the binder and conductive material that can be contained in the negative electrode layer 1 include the binder and conductive material that can be contained in the positive electrode layer 3. In addition, when the negative electrode layer 1 is manufactured, the above-described solvents that can be used when the positive electrode layer 3 is manufactured can be appropriately used.

  Examples of the solid electrolyte to be contained in the solid electrolyte layer 2 include the solid electrolyte that can be contained in the positive electrode layer 3. In addition, when the solid electrolyte layer 2 is manufactured, the above-described solvents that can be used when the positive electrode layer 1 is manufactured can be appropriately used.

  The positive electrode current collector 12 and the negative electrode current collector 11 can be made of a known conductive material that can be used as a positive electrode current collector and a negative electrode current collector of a lithium ion secondary battery. Examples of such a conductive material include one or more elements selected from the group consisting of Cu, Ni, Al, V, Au, Pt, Mg, Fe, Ti, Co, Cr, Zn, Ge, and In. Examples of the metal material to be included can be given.

  After the electrode body 10 is produced as described above, the end of the positive electrode current collector 12 is bent in a direction that is the stacking direction of the electrode body 10 as shown in FIG. At this time, the length and the position of the bent portion may be appropriately adjusted according to the position where the electrode body 10 is disposed in the stacked body 50a. That is, the curved portion 12a of the current collector 12 is formed so that the curved portion 12a overlaps with the curved portion 12a of another current collector 12 in a later step.

  Next, a plurality of electrode bodies 10 are produced and laminated in the same manner as described above, and a laminated body 50b is produced as shown in FIG. At this time, as shown in FIG. 3A, the curved portion 12a of the current collector 12 provided in each electrode body 10 is in a direction perpendicular to the stacking direction of the electrode bodies 10 (left and right in FIG. 3A). The electrode body 10 is laminated so as to overlap in the direction). By stacking the electrode body 10 by stacking the current collectors 12 bent in a substantially L shape in this manner, the displacement of the electrode body 10 at the time of stacking is suppressed, the capacity of the battery 100 is decreased, and the electrical resistance is increased. It becomes easy to suppress.

  Since the stacked body 50a can be manufactured by the same method as the stacked body 50b, detailed description thereof is omitted.

  Next, the laminated bodies 50a and 50b produced as described above are laminated via the insulating member 30 as shown in FIG. Also at this time, the stacked bodies 50a are arranged so that the curved portions 12a of the current collectors 12 provided in the respective electrode bodies 10 overlap in a direction orthogonal to the stacking direction of the electrode bodies 10 (the left-right direction in FIG. 3B). , 50b. Thereafter, at a position surrounded by an ellipse in FIG. 3B, a plurality of current collectors 12 provided in the stacked bodies 50 a and 50 b are bundled and connected to form a connection portion 14. A part (part ahead of the connection part 14) is excised. The method for bundling and connecting the current collectors 12 is not particularly limited. For example, they can be connected by ultrasonic welding, resistance welding, laser welding, pressure bonding, or the like.

  As the insulating member 30, a known insulating material that can withstand the operating environment of the lithium ion secondary battery can be appropriately used. Examples of such an insulating material include known thermoplastic resins and thermosetting resins.

  After the current collectors 12 are bundled and connected as described above, the positive electrode current collector 11 of the stacked body 50a is connected to the positive electrode terminal 13a, and the negative electrode current collector 11 of the stacked body 50b is connected to the negative electrode terminal. The battery 100 can be obtained by accommodating the laminates 50a and 50b in the exterior member 20 so as to be connected to 13b.

  The exterior material 20 is not particularly limited, such as a film that can withstand the environment when the lithium ion secondary battery is used, has a property that does not allow gas or liquid to permeate, and can be sealed. Can be used. Examples of the constituent material of such a film include resin films such as polyethylene, polyvinyl fluoride, and polyvinylidene chloride, and metal deposited films obtained by depositing a metal such as aluminum on these surfaces.

  In the battery 100 described so far, the current collectors 12 are all bent in the same direction, but the present invention is not limited to such a form. Hereinafter, the battery 200 according to the second embodiment will be described. FIG. 4 is a cross-sectional view schematically showing the battery 200. FIG. 5A is a diagram schematically showing an electrode body 210 a provided in the battery 200. FIG. 5B is a diagram schematically showing an electrode body 210 b provided in the battery 200. 5 (a) and 5 (b), the upper diagram is a perspective view, and is a diagram seen from the stacking direction (upper side of the drawing in FIG. 4).

  As shown in FIG. 4, the battery 200 includes laminated bodies 250a and 250b in which a plurality of electrode bodies 210a and 210b are laminated, and an exterior member 20 that houses the laminated bodies 250a and 250b. Moreover, in the exterior material 20, the laminated bodies 250a and 250b are laminated | stacked via the insulating member 30, and are connected in series.

  The plurality of electrode bodies 210a and 210b include current collectors 212a and 212b, respectively, and the plurality of electrode bodies 210a and 210b are bent in one direction of the stacking direction of the electrode bodies 210a and 210b. And a second electrode body 210b including a current collector 212b bent in the other direction of the stacking direction of the electrode bodies 210a and 210b.

  In the following description of the battery 200, the stacked body including the stacked bodies 250a and 250b and the insulating member 30 is referred to as a stacked body 250 (see FIG. 6). Further, as described above, the electrode body 210a and the electrode body 210b are distinguished by the direction in which the current collector is bent. That is, as shown in FIGS. 5 (a) and 5 (b), an electrode body including a current collector 212a bent to the upper side in the stacking direction of the electrode bodies 210a and 210b (the upper side in FIG. 4) is an electrode. The electrode body 210a is an electrode body provided with a current collector 212b bent to the lower side in the stacking direction of the electrode bodies 210a and 210b (the lower side in FIG. 4).

  As described above, the stacked body 250a and the stacked body 250b include the first electrode body 210a including the current collector 212a having the bent portion 212aa bent in one direction of the stacking direction of the electrode bodies 210a and 210b, And a second electrode body 210b including a current collector 212b having a curved portion 212ba bent in the other direction of the stacking direction of the bodies 210a and 210b. The plurality of first electrode bodies 210a are connected to each other so that the curved portions 212aa are in contact with each other, and the plurality of second electrode bodies 210b are connected to each other so that the curved portions 212ba are in contact with each other. Are connected to each other. On the other hand, the current collector 212a of the first electrode body 210a and the current collector 212b of the second electrode body 210b are not connected. In this way, the plurality of first electrode bodies 210a and second electrode bodies 210b included in the stacked body 250a are connected in parallel, and the plurality of first electrode bodies 210a and second electrodes included in the stacked body 250b are also connected. The electrode bodies 210b are connected in parallel, and the first electrode body 210a and the second electrode body 210b provided in the laminated body 250a and the first electrode body 210a and the second electrode body 210b provided in the laminated body 250b are connected in series. It is connected.

  The battery 200 can be the same as the battery 100 except that the shape and connection method of the current collectors 212 a and 212 b provided in the electrode bodies 210 a and 210 b are different from those of the current collector 12 provided in the electrode body 10. Therefore, in the following description of the battery 200, the configuration of the battery 200 will be described while explaining the manufacturing example of the battery 200 including the shape of the current collectors 212a and 212b and the connection method of the current collectors 212a and 212b.

  In order to manufacture the battery 200, first, electrode bodies 210a and 210b as shown in FIGS. 5A and 5B are manufactured. The electrode bodies 210a and 210b can be manufactured in the same manner as the electrode body 10 described above except that the current collectors 212a and 212b having a shape different from that of the current collector 12 are used.

  In the current collector 212a, a part of the portion where the positive electrode layer 1, the solid electrolyte layer 2, and the negative electrode layer 3 are not formed is cut out. Further, the current collector 212a is partially formed of the laminate 250 as shown in FIG. 5A after the positive electrode layer 1, the solid electrolyte layer 2 and the negative electrode layer 3 are formed or before the current collector 212a is formed. A bent portion 212aa is formed by bending in the stacking direction (upper side of the drawing in FIG. 4). The width w2 of the curved portion 212aa (see the lower part of FIG. 5A) is preferably less than half of the total width w1 of the current collector 212a (see the lower part of FIG. 5A). The width w2 is preferably as large as possible because the electrical resistance at the connecting portion can be lowered. However, in order to prevent the current collector 212a and the current collector 212b from contacting each other, the total width w1 of the current collector 212a and the total width w3 of the current collector 212b (see the lower part of FIG. 5B) are the same size. If so, the width w2 is preferably less than half of the width w1 as described above.

  In the current collector 212b, a part of the portion where the positive electrode layer 1, the solid electrolyte layer 2, and the negative electrode layer 3 are not formed is cut out. In addition, the current collector 212b is partially formed of the laminate 250 as shown in FIG. 5B after the positive electrode layer 1, the solid electrolyte layer 2, and the negative electrode layer 3 are formed or before they are formed. A bent portion 212ba is formed by bending in the stacking direction (the lower side of the drawing in FIG. 4). For the same reason as the width w2, the width w4 of the curved portion 212ba is preferably less than half the total width w3 of the current collector 212b.

  Next, a plurality of electrode bodies 210 a and 210 b are stacked to form stacked bodies 250 a and 250 b, and the stacked bodies 250 a and 250 b are stacked via the insulating member 30. At this time, the electrode bodies 210a are stacked such that the curved portions 212aa of the current collectors 212a provided in each electrode body 210a overlap in a direction perpendicular to the stacking direction of the electrode bodies 210a. Further, the electrode bodies 210b are stacked so that the curved portions 212ba of the current collectors 212b provided in the respective electrode bodies 210b overlap in a direction orthogonal to the stacking direction of the electrode bodies 210b. By stacking the electrode bodies by stacking the current collectors bent in a substantially L shape in this way, it is possible to suppress displacement of the electrode bodies at the time of stacking, and to suppress a decrease in the capacity of the battery 200 and an increase in electrical resistance. Becomes easier.

  Next, the current collectors 212a and the current collectors 212b included in the stacked bodies 250a and 250b are connected to each other, and the stacked body 250 illustrated in FIG. 6 is manufactured. FIG. 6 is a perspective view schematically showing the stacked body 250. The connection method between the current collectors 212a and the connection method between the current collectors 212b are not particularly limited. For example, the connection can be performed by ultrasonic welding, resistance welding, laser welding, pressure bonding, or the like.

  After the laminated body 250 is manufactured as described above, the battery 200 can be obtained by housing it in the exterior material 20.

  According to such a battery 200, like the battery 100 described above, the space S3 (see FIG. 4) required for connecting the current collectors can be reduced, so that the space around the connecting portion between the current collectors is generated. Volume energy density can be increased by reducing wasted space. Furthermore, according to the battery 200, the current collectors can be connected to each other at a position that does not protrude from the stacked body 250 in the stacking direction of the electrode bodies. Therefore, the volume energy density can be further increased. Moreover, it becomes easy to prevent the connection part of collectors from damaging the exterior | packing material 20 because the connection part of collectors does not protrude.

  In addition, as the battery 200, the current collector 212a of the first electrode body 210a and the current collector 212b of the second electrode body 210b are exemplified as being not connected, but the present invention is not limited to such a form, The current collector of the first electrode body and the current collector of the second electrode body may be connected.

  Moreover, the form shown so far is an illustration of this invention and this invention is not limited to these forms. For example, the number of electrode bodies provided in the battery of the present invention is not limited to the number shown. Moreover, the single battery provided in the battery of the present invention may be a monopolar battery or a bipolar battery. Moreover, in the above description regarding the present invention so far, the lithium ion secondary battery has been described as an example, but the present invention is not limited to the embodiment. The battery of the present invention can also be configured such that ions other than lithium ions move between the positive electrode layer and the negative electrode layer. Examples of such ions include sodium ions, potassium ions, magnesium ions, calcium ions and the like. In the case where ions other than lithium ions move, the positive electrode active material, the solid electrolyte, and the negative electrode active material may be appropriately selected according to the moving ions. Moreover, although the case where this invention is applied to the secondary battery which can be charged / discharged was illustrated in the said description regarding this invention, this invention is not limited to the said form. The battery of the present invention may be a so-called primary battery.

DESCRIPTION OF SYMBOLS 1 Positive electrode layer 2 Solid electrolyte layer 3 Negative electrode layer 10, 210a, 210b Electrode body 11, 12, 212a, 212b Current collector 13a Terminal (positive electrode terminal)
13b terminal (negative terminal)
DESCRIPTION OF SYMBOLS 14 Connection part 20 Exterior body 30 Insulation member 50, 250a, 250b Laminate body 250 Laminate body 100, 200 Battery 510 Electrode body 511 Current collector 512 Current collector 513 Terminal 514 Connection part 520 Exterior body 530 Insulation member 550 Laminate body 500 Battery

Claims (5)

A battery comprising a laminate in which a plurality of electrode bodies are laminated,
Each of the plurality of electrode bodies includes a current collector,
Each of the current collectors is a battery that is bent in one direction in the stacking direction of the electrode bodies and connected to each other.   2. The current collector includes a curved portion bent in one direction of the stacking direction of the electrode bodies, and the plurality of electrode bodies are stacked so that the curved portions are in contact with each other. Battery. A battery comprising a laminate in which a plurality of electrode bodies are laminated,
Each of the plurality of electrode bodies includes a current collector,
The plurality of electrode bodies include a first electrode body provided with the current collector bent in one direction in the stacking direction of the electrode bodies, and the current collector bent in the other direction in the stacking direction of the electrode bodies. A second electrode body provided with an electric body, and
A battery in which current collectors of the first electrode body are connected to each other, and current collectors of the second electrode body are connected to each other.   The battery according to claim 3, wherein the current collector of the first electrode body and the current collector of the second electrode body are not connected. Each of the current collectors includes a bent portion bent in the stacking direction of the electrode bodies,
The battery according to claim 3 or 4, wherein the plurality of electrode bodies are laminated so that the curved portions are in contact with each other.

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