JP2012084247A - Batter and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery capable of preventing a deterioration of performance due to external force applied to, and a manufacturing method thereof.SOLUTION: In this battery, a lower lid having an under surface and a side surface erected from the under surface and an opening on an upper surface side, and an upper lid having an upper surface and a side surface erected from the upper surface and an opening on the under surface side are provided in a container which houses a battery cell, and the side surface of the lower lid and the side surface of the upper lid are overlapped, and a terminal connected to the battery cell housed in the container is fixed on a side surface of the container. The manufacturing method for the battery comprises: a step to fix the terminal on the side surface of the container; a step to connect the terminal and the battery cell; a step to arrange the battery cell from a direction crossing the under surface of the lower lid into the lower lid or from a direction crossing the upper surface of the upper lid into the upper lid; a step to arrange the upper lid and the lower lid so as to surround the battery cell and overlap the side surface of the lower lid and the side surface of the upper lid after those steps forementioned; and a step to bond the overlapped side surface of the lower lid and the side surface of the upper lid followed by sealing of the container.

Description

  The present invention relates to a battery and a method for manufacturing the same, and more particularly to a battery including a container having different thicknesses of upper and lower surfaces and side surfaces and a method for manufacturing the same.

  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. For this reason, it is used as a secondary battery that can be easily reduced in size and weight in information equipment such as a mobile phone, and in recent years, there is an increasing demand for large motive power such as for 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 the electrolyte provided in the electrolyte layer, for example, a non-aqueous liquid or solid is used. When a liquid (hereinafter referred to as “electrolytic solution”) is used as the electrolyte, the electrolytic solution easily penetrates into the positive electrode layer and the negative electrode layer. Therefore, an interface between the active material contained in the positive electrode layer or the negative electrode layer and the electrolytic solution is easily formed, and the 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, since the solid electrolyte (hereinafter referred to as “solid electrolyte”) is nonflammable, the above system can be simplified. Therefore, a lithium ion secondary battery (hereinafter referred to as “solid battery”) in a form provided with a layer containing a solid electrolyte that is nonflammable (hereinafter referred to as “solid electrolyte layer”) has been proposed. Yes.

  As a technique related to such a battery, for example, Patent Document 1 discloses a thin type manufactured by attaching a battery lid to which a positive electrode terminal and a negative electrode terminal are attached via an insulating member to an upper surface opening of a battery case by welding or the like. A battery is disclosed. Patent Document 2 discloses that a flat electrochemical cell is housed in a box-shaped first frame body in which a side wall portion is suspended from a lower surface plate and a peripheral edge of the lower surface plate, and the side wall portion of the first frame body. A technique is disclosed in which the outer peripheral edge of the flat electrochemical cell is folded to the outer periphery, and the upper plate and a box-shaped second frame body formed by hanging a side wall portion around the upper plate are closed. Yes.

JP 2009-272234 A JP 2008-103239 A

  A deep battery case (hereinafter, sometimes referred to as a “conventional battery case”) used in the technique disclosed in Patent Document 1 is usually manufactured by drawing. However, when a battery case having a deep depth is produced by drawing (deep drawing), there is a problem that productivity is likely to be lowered and manufacturing cost is likely to be increased. In a solid battery, a fastening pressure is applied in a direction intersecting the layer interface for the purpose of reducing resistance at the layer interface between the solid electrolyte layer, the positive electrode layer, and the negative electrode layer. This fastening pressure is preferably uniformly applied to the layer interface from the viewpoint of easily reducing the performance unevenness, and in order to uniformly apply the fastening pressure, the direction in which the fastening pressure is applied and It is preferable to reduce the thickness of the surface of the battery case arranged so as to intersect. On the other hand, from the viewpoint of applying a fastening pressure that can sufficiently reduce the resistance, the fastening pressure is preferably a predetermined value or more, and from the viewpoint of ensuring the strength that can withstand such pressure, the fastening pressure is It is preferable to increase the thickness of the surface of the battery case that is arranged in parallel to the applied direction. However, when a battery case is produced by drawing, the thickness between the surface disposed so as to intersect the direction in which the fastening pressure is applied and the thickness of the surface disposed in parallel with the direction in which the fastening pressure is applied. It is difficult to make a difference between the two. If the thickness of the battery case is increased overall in order to ensure the strength against the fastening pressure, it becomes difficult to uniformly apply the fastening pressure to the solid state battery accommodated in the battery case. There was a problem that it was easy to decrease. On the other hand, if the thickness of the battery case is made thin overall in order to easily apply the fastening pressure to the solid battery, the battery case to which the fastening pressure is applied is likely to be deformed. There was a problem that it was easy to decrease. In addition, as in the technique disclosed in Patent Document 2, when the outer peripheral edge portion of the electrochemical cell is sandwiched between the side surface of the first frame body and the side surface of the second frame body, the fastening pressure is applied. There is a possibility that the outer periphery of the outer body sandwiched between the first frame body and the second frame body may be broken. In the technique disclosed in Patent Document 2, when the outer periphery of the outer package breaks, the electrochemical cell easily moves in the battery case, and thus there is a problem that the performance of the battery is likely to deteriorate.

  Then, this invention makes it a subject to provide the battery which can prevent the fall of performance, and its manufacturing method.

In order to solve the above problems, the present invention takes the following means. That is,
A first aspect of the present invention is a battery comprising a battery cell and a container for housing the battery cell, the container having a lower surface, a side surface standing from the lower surface, and an opening provided on the upper surface side. A lower lid, and an upper lid having an upper surface, a side surface erected from the upper surface, and an opening provided on the lower surface side, and the side surface of the lower lid and the side surface of the upper lid are overlapped and accommodated in a container The battery is characterized in that the terminal connected to the battery cell is fixed to a member constituting the side surface of the container.

  Here, in the present invention, the “battery cell” refers to a structure in which ions and electrons generated by an electrochemical reaction move, including a positive electrode layer, a negative electrode layer, and an electrolyte disposed between the positive electrode layer and the negative electrode layer. A terminal (a positive terminal connected to the positive electrode layer and a negative electrode terminal connected to the negative electrode layer) used for the purpose of taking a body and taking out electric energy to the outside is not included in the battery cell of the present invention. In the present invention, a “container” is an exterior body that houses battery cells. The container in this invention should just have a lower cover and an upper cover, and may have another member in addition to a lower cover and an upper cover. For example, the opening provided on the upper surface side of the lower lid and the opening provided on the lower surface side of the upper lid are overlapped to face each other, and the side surface surrounding the entire circumference of the lower surface of the lower lid and the entire circumference of the upper surface of the upper lid The container formed by joining the side surface which surrounds may be sufficient, and the container further provided with the member which comprises the side surface of a container in addition to a lower cover and an upper cover may be sufficient. In the present invention, “the terminal is fixed to a member constituting the side surface of the container” means that when the container includes a lower lid and an upper lid, a lower lid (for example, a lower lid 21x described later). This means that the terminal is fixed to the side surface or the side surface of the upper lid (for example, the upper lid 21y described later). On the other hand, in the case where the container further includes a member constituting the side surface of the container in addition to the lower lid and the upper lid, "the terminal is fixed to the member that should constitute the side surface of the container" A terminal is connected to a side surface of a lid (for example, a lower lid 12a to be described later), a side surface of an upper lid (for example, an upper lid 12b to be described later), or a member (for example, a side surface portion 12c or a side surface portion 12d to be described later). Is fixed.

  According to a second aspect of the present invention, a lower lid having a lower surface, a side surface standing from the lower surface, and an opening provided on the upper surface side, and a side surface standing from the upper surface and the upper surface are provided on the lower surface side. A container comprising an upper lid having an opening, a battery cell accommodated in the container, and a method of manufacturing a battery comprising a terminal connected to the battery cell and fixed to a side surface of the container, A terminal side surface fixing step of fixing a terminal to a member constituting the side surface, a terminal cell connection step of connecting the terminal and the battery cell, and arranging the battery cell from the direction intersecting the upper surface of the upper lid into the upper lid, or The battery cell is arranged from the direction intersecting the lower surface of the lower lid into the lower lid so that the lower side of the battery cell is covered after the arranging step, the terminal side surface fixing step, the terminal cell connecting step, and the arranging step. Place the lower lid or cover the upper side of the battery cell An upper lid is disposed, and an overlapping step of overlapping the side surface of the lower lid and the side surface of the upper lid, and a sealing step of sealing the container through a process of joining the side surface of the overlapped lower lid and the side surface of the upper lid, It is a manufacturing method of the battery characterized by having.

  Here, in the arranging step, the battery cell is arranged in the upper lid from the direction intersecting the upper surface of the upper lid, for example, when the side surface of the upper lid and the terminal are fixed in the terminal side surface fixing step. On the other hand, in the arranging step, the battery cell is arranged from the direction intersecting the lower surface of the lower lid into the lower lid, for example, when the side surface of the lower lid and the terminal are fixed in the terminal side surface fixing step. is there. In the overlaying step, the lower lid is arranged so as to cover the lower side of the battery cell when the battery cell is arranged in the upper lid from the direction intersecting the upper surface of the upper lid in the arranging step. On the other hand, in the overlapping step, the upper lid is arranged so as to cover the upper side of the battery cell when the battery cell is arranged in the lower lid from the direction intersecting the lower surface of the lower lid in the arranging step. .

  In the second aspect of the present invention, it is preferable that the container has a rectangular parallelepiped shape, and the lower surface and the upper surface of the container are larger than the side surface of the container.

  In the battery according to the first aspect of the present invention, the side surface of the container includes a portion where the side surface standing from the lower surface of the lower lid and the side surface standing from the upper surface of the upper lid are overlapped. By setting it as this form, the thickness of the side surface of a container can be made thicker than the thickness of the upper surface and lower surface of a container. By applying the fastening pressure from the direction intersecting the upper and lower surfaces of the relatively thin container, it becomes possible to uniformly apply pressure to the battery cells accommodated in the container. The side surface of the thick container makes it possible to ensure the strength to withstand the applied fastening pressure. In the battery according to the first aspect of the present invention, the battery cell and the terminal are not sandwiched between the side surface of the lower lid and the side surface of the upper lid. Therefore, it is possible to avoid a situation where the battery cell is broken by the applied pressure. That is, according to the first aspect of the present invention, it is possible to provide a battery capable of preventing a decrease in performance due to an applied external force (fastening pressure). Moreover, by setting it as the form by which the solid electrolyte layer is contained in the battery cell, the battery which can improve a performance by providing external force (fastening pressure) can be provided.

  According to the battery manufacturing method of the second aspect of the present invention, the battery according to the first aspect of the present invention can be manufactured. Therefore, according to the 2nd aspect of this invention, the manufacturing method of a battery which can manufacture the battery which can prevent the performance fall by the applied external force can be provided.

  Moreover, in the 2nd aspect of this invention, since a container is a rectangular parallelepiped shape and the lower surface and upper surface of a container are larger than the side surface of a container, it becomes easy to accommodate a battery cell in a container. Therefore, by adopting such a configuration, in addition to the above effects, it becomes easy to improve battery productivity.

1 is a diagram illustrating a battery 10. FIG. 3 is a top view of the battery 10. FIG. 2 is a front view of a battery 10. FIG. 3 is a side view of the battery 10. FIG. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is a flowchart explaining the manufacturing method of a battery. FIG. 4 is a diagram illustrating a battery 20. 3 is a top view of the battery 20. FIG. 3 is a front view of a battery 20. FIG. 3 is a side view of the battery 20. FIG. It is a figure explaining the production process of lower lid 21x. It is a figure explaining the preparation methods of upper lid 21y. It is a flowchart explaining the manufacturing method of a battery.

  The present invention will be described below with reference to the drawings. In addition, the form shown below is an illustration of this invention and this invention is not limited to the form shown below.

1. First Embodiment FIG. 1 is an exploded view showing a battery 10 of the present invention according to a first embodiment. In order to facilitate understanding of the battery 10, the battery cell 11, the container 12, and the like are simplified in FIG. 1. 2 is a top view of the battery 10, FIG. 3 is a front view of the battery 10, and FIG. 4 is a side view of the battery 10. FIG. 5 is a cross-sectional view taken along line VV in FIG. Are shown in FIG. In order to make it easy to confirm the holes 15 and 15, the terminals 13 and 14 are not shown in FIG. 4. In the following description, of the side surfaces of the container 12, the side surface located on the lower side of the paper surface of FIG. 2 is the side surface 12 y, the side surface located on the upper side of the paper surface of FIG. 12c, the side surface located on the right side in FIG. 2 may be referred to as a side surface 12d.

  As illustrated in FIGS. 1 to 6, the battery 10 includes a battery cell 11, a rectangular parallelepiped container 12 that houses the battery cell 11, and terminals 13 and 14 that connect the battery cell 11 and the container 12. Yes. The container 12 includes a lower lid 12a disposed on the lower side of the battery cell 11, an upper lid 12b disposed on the upper side of the battery cell 11, a side surface portion 12c and a side surface portion 12d corresponding to a pair of side surfaces of the container 12, have. The container 12 has an upper surface 12bx and a lower surface 12ax that are larger than the side surface 12y, the side surface 12z, the side surface 12c, and the side surface 12d.

  The battery cell 11 has a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer. The positive electrode layer is a layer having at least a positive electrode active material, and a positive electrode current collector is connected to the positive electrode layer. The negative electrode layer is a layer having at least a negative electrode active material, and a negative electrode current collector is connected to the negative electrode layer. In the battery 10, the terminal 13 is connected to the positive electrode current collector, and the terminal 14 is connected to the negative electrode current collector.

  The lower lid 12a has a rectangular lower surface 12ax and a pair of side surfaces 12ay and 12az erected from the lower surface 12ax, and a member facing the lower surface 12ax is not provided in the lower lid 12a. Therefore, the lower lid 12a is opened on the upper surface side, and further, the portions where the side surface portion 12c and the side surface portion 12d are to be disposed are also opened. The lower lid 12a is manufactured by bending a flat plate-shaped member to form the side surfaces 12ay and 12az.

  The upper lid 12b has a quadrangular upper surface 12bx and a pair of side surfaces 12by and 12bz erected from the upper surface 12bx, and a member facing the upper surface 12bx is not provided in the upper lid 12b. Therefore, the lower surface side of the upper lid 12b is opened, and further, the portions where the side surface portion 12c and the side surface portion 12d are to be disposed are also opened. The upper lid 12b is manufactured by bending a flat plate-like member to form the side surfaces 12by and 12bz.

  The side surface portion 12 c and the side surface portion 12 d are members corresponding to a pair of side surfaces of the container 12. Holes 15 and 15 through which the terminals 13 and 14 are passed are formed in the side surface portion 12d.

  FIG. 7 is a flowchart for explaining the battery manufacturing method of the present invention. A method for manufacturing the battery 10 will be described with reference to FIGS. The battery manufacturing method of the present invention shown in FIG. 7 includes a battery cell manufacturing step (S11), a lower lid manufacturing step (S12), an upper lid manufacturing step (S13), a side surface manufacturing step (S14), a terminal It has a side surface fixing step (S15), a terminal cell connecting step (S16), an arrangement step (S17), an overlaying step (S18), and a sealing step (S19).

  S11 is a process of producing a battery cell. In the method for producing a battery of the present invention, the method for producing the battery cell is not particularly limited, and a known method can be appropriately used. When manufacturing the battery 10, in S11, for example, a positive electrode material containing a positive electrode active material and a solid electrolyte is placed on the surface of the positive electrode current collector and pressed to form a positive electrode layer on the surface of the positive electrode current collector. The negative electrode material containing the negative electrode active material and the solid electrolyte is placed on the surface of the negative electrode current collector and pressed to form a negative electrode layer on the surface of the negative electrode current collector, and the solid electrolyte is applied to the surface of the positive electrode layer. A solid electrolyte layer can be formed by arranging and pressing. Thus, after forming the positive electrode layer, the negative electrode layer, and the solid electrolyte layer, a positive electrode current collector having a solid electrolyte layer and a positive electrode layer formed on the surface, and a negative electrode current collector having a negative electrode layer formed on the surface, A battery cell 11 can be produced by stacking a solid electrolyte layer between a positive electrode layer and a negative electrode layer to form a laminate, and housing the pressed laminate in an exterior material. it can.

  S12 is a step of producing a lower lid. When manufacturing the battery 10, S12 can be made into the process of producing the lower cover 12a by, for example, bending a flat plate-shaped member and forming the side surfaces 12ay and 12az.

  S13 is a process for producing an upper lid. When manufacturing the battery 10, S13 can be made into the process of producing the upper cover 12b by, for example, bending a flat plate-shaped member and forming the side surfaces 12by and 12bz.

  S14 is a step of producing a side surface portion. In the case of manufacturing the battery 10, in S14, for example, the side surface portion 12c is manufactured by performing a drawing process so that the depth is several mm, and the holes 15 and 15 are provided after performing the same drawing process. The step of producing the side surface portion 12d can be performed.

  S15 is a step of fixing the terminal and the side surface of the container. When the battery 10 is manufactured, S15 is performed by, for example, the terminal 13 by a method in which welding and caulking are combined so that the tip of the terminal 13 is fixed in a state of protruding to the outside of the side surface portion 12d (the right side in FIG. 1). Is fixed to the side surface portion 12d, and the terminal 14 is fixed by a method combining welding and caulking so that the tip end of the terminal 14 is fixed to the outside of the side surface portion 12d (right side of the drawing in FIG. 1). A step of fixing to the side surface portion 12d.

  S16 is a step of connecting the terminal and the battery cell. When manufacturing the battery 10, for example, S16 includes ultrasonic welding or laser welding of the terminal 13 fixed to the side surface portion 12d in S15 and the positive electrode current collector provided in the battery cell 11 manufactured in S11. The terminal 14 connected by welding or the like and fixed to the side surface portion 12d in S15 is connected to the negative electrode current collector provided in the battery cell 11 manufactured in S11 by ultrasonic welding or laser welding. By this, it can be set as the process of connecting the terminals 13 and 14 and the battery cell 11. FIG.

  S17 is a step of arranging the battery cell from the direction intersecting the upper surface of the upper lid into the upper lid, or arranging the battery cell from the direction intersecting the lower surface of the lower lid into the lower lid. When manufacturing the battery 10, for example, S <b> 17 is a step in which the battery cell 11 connected to the terminals 13 and 14 fixed to the side surface portion 12 d is connected to the lower lid 12 a from the upper side of FIG. 1 facing the lower surface 12 ax of the lower lid 12 a. And a step of arranging in 12a.

  S18 is a step of arranging the lower lid so as to cover the lower side of the battery cell, or arranging the upper lid so as to cover the upper side of the battery cell, and overlapping the side surface of the lower lid with the side surface of the upper lid. . When the battery 10 is manufactured and the battery cell 11 is arranged in the lower lid 12a in S17, the upper side of the battery cell 11 arranged in the lower lid 12a is covered by the upper surface 12bx in S18. By arranging the upper lid 12b so that the side surface 12by is disposed between the side surface 12ay and the battery cell 11, and the side surface 12bz is disposed between the side surface 12az and the battery cell 11, the side surfaces 12ay, 12az and the side surface 12by, A step of superimposing 12 bz.

  S19 is a step of sealing the container through a process of joining the side surface of the overlapped lower lid and the side surface of the upper lid. When the battery 10 is manufactured, in S19, the side surface 12ay of the lower lid 12a and the side surface 12by of the upper lid 12b overlapped in S18 are joined by laser welding, and the side surface 12az of the lower lid 12a and the side surface 12bz of the upper lid 12b are joined. The container 12 is hermetically sealed by laser welding, and the side surface portion 12c, the lower lid 12a, and the upper lid 12b are joined by laser welding, and the side surface portion 12d, the lower lid 12a, and the upper lid 12b are joined by laser welding. And a process of performing. Thus, the battery 10 can be manufactured through S11 to S19.

  The battery 10 manufactured in this way has the side surface (the side surface 12y formed by joining the side surface 12ay and the side surface 12by, and the side surface 12az and the side surface, rather than the thickness of the upper surface 12bx and the lower surface 12ax of the container 12. The thickness of the side surface 12z) formed by joining 12bz can be increased. Therefore, by applying the fastening pressure from the direction intersecting the upper surface 12bx and the lower surface 12ax, it becomes possible to apply the pressure uniformly to the battery cells 11 accommodated in the container 12, and the side surface 12y and the side surface 12z It is possible to ensure the strength that can withstand the applied fastening pressure. As shown in FIGS. 2 to 6, the battery cell 11 and the terminals 13 and 14 are not sandwiched between the side surface of the lower lid 12a and the side surface of the upper lid 12b. Therefore, even if a fastening pressure is applied, the battery cell 11 The peripheral edge of the terminal and the terminals 13 and 14 are not broken. In addition, as described above, since the battery cell 11 is fixed to the container 12 (more specifically, the side surface portion 12d) via the terminals 13 and 14, the battery cell 11 is not affected even when a fastening pressure is applied. The situation of moving in the container 12 can be suppressed. Thus, according to the battery 10, since it becomes possible to apply a pressure uniformly to the battery cell 11, and to suppress the movement of the battery cell 11 in the container 12, it is possible to prevent a decrease in performance. Is possible. In other words, according to the present invention, it is possible to provide a battery 10 and a method for manufacturing the same that can prevent performance degradation. Further, the solid electrolyte layer provided in the battery cell 11 by applying a fastening pressure from the outside of the container 12 having a strength capable of withstanding pressure, more specifically, from the direction intersecting the upper surface 12bx and the lower surface 12ax. It is possible to reduce the resistance at the interface between the positive electrode layer and the negative electrode layer. Therefore, according to the present invention, it is possible to provide a battery 10 capable of improving performance by applying a fastening pressure, and a manufacturing method thereof.

In the battery 10, as the positive electrode active material contained in the positive electrode layer of the battery cell 11, a known positive electrode active material typified by lithium cobaltate can be appropriately used. Moreover, as a solid electrolyte contained in the positive electrode layer, in addition to an oxide solid electrolyte such as Li ₃ PO ₄ , Li ₃ PS ₄ or Li ₂ S: P ₂ S ₅ = 50: 50 to 100: 0. become as Li ₂ S and _P 2 _{S 5} sulfide was prepared by mixing a solid electrolyte (e.g., by mass _{ratio, Li 2 S: P 2 S} 5 = 70: 30 to become as Li ₂ S and A known solid electrolyte such as a sulfide solid electrolyte prepared by mixing P ₂ S ₅ can be appropriately used. In addition, the positive electrode layer can contain a known conductive material such as acetylene black.

  Moreover, in the battery 10, as a negative electrode active material contained in the negative electrode layer of the battery cell 11, a well-known negative electrode active material represented by graphite etc. can be used suitably. In addition, as the solid electrolyte contained in the negative electrode layer, a substance similar to the solid electrolyte that can be used for the positive electrode layer can be used. In addition, the negative electrode layer can contain a known conductive material such as acetylene black.

  Moreover, in the battery 10, as a solid electrolyte used for the solid electrolyte layer of the battery cell 11, the same substance as the solid electrolyte that can be used for the positive electrode layer and the negative electrode layer can be used.

  In the battery 10, as the positive electrode current collector and the negative electrode current collector, known current collectors usable for the battery such as Al foil, Cu foil, Ni foil, Fe foil, CuNi foil, and CuFe foil are used. As the terminals 13 and 14, a known conductive material typified by copper or gold can be used as appropriate. Furthermore, as the constituent material of the container 12 (the lower lid 12a and the upper lid 12b), the same material as the material of the container used for the conventional battery can be used as appropriate. As such a material, a well-known synthetic resin etc. other than electroconductive materials, such as aluminum and stainless steel, can be illustrated.

  In the above description related to the present invention, the form in which the container 12 formed by joining four members (the lower lid 12a, the upper lid 12b, the side surface portion 12c, and the side surface portion 12d) is provided is described. The manufacturing method is not limited to the embodiment. Then, the other form which the battery of this invention and its manufacturing method can take is demonstrated below.

2. Second Embodiment FIG. 8 is an exploded view showing a battery 20 of the present invention according to a second embodiment. In order to facilitate understanding of the battery 20, the battery cell 11, the container 21, and the like are simplified in FIG. 8. 9 is a top view of the battery 20, FIG. 10 is a front view of the battery 20, and FIG. 11 is a side view of the battery 20. In order to make it easy to check the holes 23, 23, the description of the terminals 13, 14 is omitted in FIG. 8 to 11, components similar to those of the battery 10 are denoted by the same reference numerals as those used in FIGS. 1 to 6, and description thereof is omitted as appropriate. In the following description, of the side surfaces of the container 21, the side surface located on the lower side of the page of FIG. 9 is the side surface 21 a, the side surface positioned on the upper side of the page of FIG. 21c, the side surface located on the right side of the sheet of FIG.

  As shown in FIGS. 8 to 11, the battery 20 includes a battery cell 11, a rectangular parallelepiped container 21 that houses the battery cell 11, and terminals 13 and 14 that connect the battery cell 11 and the container 21. Yes. The container 21 has a lower lid 21 x disposed on the lower side of the battery cell 11 and an upper lid 21 y disposed on the upper side of the battery cell 11.

  The lower lid 21x has a rectangular-shaped lower surface 21xu and side surfaces 21xa, 21xb, 21xc, and 21xd erected from the lower surface 21xu, and a member that faces the lower surface 21xu is provided in the lower lid 21x. It is not done. Therefore, the upper surface side of the lower lid 21x is open. Further, notches 22 and 22 are formed on the side surface 21xd of the lower lid 21x.

  FIG. 12 shows a part of the manufacturing process of the lower lid 21x. A method for manufacturing the lower lid 21x will be described with reference to FIG. When manufacturing the lower lid 21x, a plate-like member 21x 'cut into a shape as shown in FIG. 12A is prepared, and portions corresponding to the side surfaces 21xa, 21xb, 21xc, and 21xd are bent. Then, the end faces (specifically, end face 21xa1 and end face 21xd2, end face 21xd1 and end face 21xb2, end face 21xb1 and end face 21xc2, end face 21xc1 and end face 21xa2) are joined by laser welding, as shown in FIG. A lower lid 21x can be produced.

  The upper lid 21y has a quadrangular upper surface 21yu and side surfaces 21ya, 21yb, 21yc, 21yd standing from the upper surface 21yu, and a member that faces the upper surface 21yu is provided in the upper lid 21y. Absent. Therefore, the lower surface side of the upper lid 21y is opened. Moreover, holes 23 and 23 are formed in the side surface 21yd of the upper lid 21y.

  FIG. 13 shows a part of the manufacturing process of the upper lid 21y. A method for manufacturing the upper lid 21y will be described with reference to FIG. When producing the upper lid 21y, a plate-like member 21y ′ cut into a shape as shown in FIG. 13A and having holes 23 and 23 is prepared, and the side surfaces 21ya, 21yb, 21yc, and 21yd are formed. Fold the corresponding part. Then, the end faces (specifically, end face 21ya1 and end face 21yd2, end face 21yd1 and end face 21yb2, end face 21yb1 and end face 21yc2, end face 21yc1 and end face 21ya2) are joined by laser welding, as shown in FIG. The lower lid 21y can be produced.

  FIG. 14 is a flowchart for explaining the battery manufacturing method of the present invention. A method for manufacturing the battery 20 will be described with reference to FIGS. The battery manufacturing method of the present invention shown in FIG. 14 includes a battery cell manufacturing step (S21), a lower lid manufacturing step (S22), an upper lid manufacturing step (S23), a terminal side surface fixing step (S24), a terminal It has a cell connection process (S25), an arrangement process (S26), an overlay process (S27), and a sealing process (S28).

  S21 is a process of producing a battery cell. Since S21 is the same process as S11, description is abbreviate | omitted.

  S22 is a step of producing a lower lid. When manufacturing the battery 20, for example, in S22, a plate-like member 21x ′ cut into a shape as shown in FIG. 12A is prepared, and the portions corresponding to the side surfaces 21xa, 21xb, 21xc, and 21xd are bent. After that, the end surface 21xa1 and the end surface 21xd2, the end surface 21xd1 and the end surface 21xb2, the end surface 21xb1 and the end surface 21xc2, and the end surface 21xc1 and the end surface 21xa2 are joined by laser welding or the like to form the lower lid 21x. it can.

  S23 is a process for producing an upper lid. When manufacturing the battery 20, S23 prepares plate-like member 21y 'by which it cut | disconnected in the shape as shown, for example to Fig.13 (a), and the holes 23 and 23 were formed, and side surface 21ya, 21yb, 21yc After bending the portion corresponding to 21yd, the end surface 21ya1 and the end surface 21yd2, the end surface 21yd1 and the end surface 21yb2, the end surface 21yb1 and the end surface 21yc2, and the end surface 21yc1 and the end surface 21ya2 are joined by laser welding or the like. A manufacturing step.

  S24 is a process of fixing the terminal and the side surface of the container. In the case of manufacturing the battery 20, in S24, for example, the terminal 13 is formed by a method that combines welding and caulking so that the tip of the terminal 13 is fixed in a state of protruding from the hole 23 formed in the side surface 21yd of the upper lid 21y. The terminal 14 is fixed to the side surface 21 yd by a method combining welding and caulking so that the terminal 14 is fixed to the side surface 21 yd and the tip of the terminal 14 is fixed in a state protruding from the hole 23 formed in the side surface 21 yd. Process.

  S25 is a step of connecting the terminal and the battery cell. When the battery 20 is manufactured, for example, S25 includes ultrasonic welding or laser welding of the terminal 13 fixed to the side surface 21yd in S24 and the positive electrode current collector provided in the battery cell 11 manufactured in S21. And the terminal 14 fixed to the side surface 21yd in S24 and the negative electrode current collector provided in the battery cell 11 produced in S21 are connected by ultrasonic welding or laser welding. , And the process of connecting the terminals 13 and 14 and the battery cell 11.

  S26 is a step of arranging the battery cell from the direction intersecting the upper surface of the upper lid into the upper lid, or arranging the battery cell from the direction intersecting the lower surface of the lower lid into the lower lid. When manufacturing the battery 20, for example, the process of S26 moves the battery cell 11 connected to the terminals 13 and 14 fixed to the side surface 21 yd from the lower side of FIG. 8 facing the upper surface 21 yu of the upper lid 21 y from the inside of the upper lid 21 y. The step of arranging the battery cell 11 in the upper lid 21y can be achieved by inserting the battery into the lid.

  S27 is a step of arranging the lower lid so as to cover the lower side of the battery cell, or arranging the upper lid so as to cover the upper side of the battery cell, and overlapping the side surface of the lower lid with the side surface of the upper lid. . When the battery 20 is manufactured, for example, the step S27 is such that the lower side of the battery cell 11 arranged in the upper lid 21y is covered with the lower surface 21xu, and the side surfaces 21xa, 21xb, 21xc, 21xd of the lower lid 21x and the battery cell 11 By placing the upper lid 21y so that the side surfaces 21ya, 21yb, 21yc, 21yd of the upper lid 21y are respectively disposed between the side surfaces 21xa, 21xb, 21xc, 21xd of the lower lid 21x and the side surfaces 21ya, 21yb of the upper lid 21y , 21yc, 21yd can be superimposed on each other.

  S28 is a step of sealing the container through a process of joining the side surface of the overlapped lower lid and the side surface of the upper lid. When manufacturing the battery 20, in S28, the side surface 21xa of the lower lid 21x and the side surface 21ya of the upper lid 21y overlapped in S27 are joined by laser welding, and the side surface 21xb of the lower lid 21x and the side surface 21yb of the upper lid 21y are joined. The container 21 is joined by laser welding, the side surface 21xc of the lower lid 21x and the side surface 21yc of the upper lid 21y are joined by laser welding, and the side surface 21xd of the lower lid 21x and the side surface 21yd of the upper lid 21y are joined by laser welding. The step of sealing. Thus, the battery 20 can be manufactured through S21 to S28.

  The battery 20 manufactured in this way has a side surface (a side surface 21a, a side surface 21xb and a side surface 21yb formed by joining the side surface 21xa and the side surface 21ya, rather than the thickness of the upper surface 21xu and the lower surface 21yu of the container 21. The thickness of the side surface 21b formed by bonding the side surfaces 21c, the side surface 21c formed by bonding the side surface 21xc and the side surface 21yc, and the side surface 21d formed by bonding the side surface 21xd and the side surface 21yd) is increased. be able to. Therefore, by applying the fastening pressure from the direction intersecting the upper surface 21xu and the lower surface 21yu, it becomes possible to uniformly apply the pressure to the battery cells 11 accommodated in the container 21, and the side surfaces 21a, 21b, 21c, By 21d, it becomes possible to ensure the strength that can withstand the applied fastening pressure. 8 to 11, the battery cell 11 and the terminals 13 and 14 are not sandwiched between the side surface of the lower lid 21x and the side surface of the upper lid 21y. Therefore, even if a fastening pressure is applied, the battery cell 11 The terminals 13 and 14 are not broken. In addition, as described above, the battery cell 11 is fixed to the container 21 (more specifically, the side surface 21yd of the upper lid 21y) via the terminals 13 and 14 in a direction intersecting with the fastening pressure. Even if it provides, the situation where the battery cell 11 moves within the container 21 can be suppressed. Thus, according to the battery 20, since it becomes possible to apply a pressure uniformly to the battery cell 11, and to suppress the movement of the battery cell 11 in the container 21, it is possible to prevent a decrease in performance. Is possible. That is, according to the present invention according to the second embodiment, it is possible to provide a battery 20 and a method for manufacturing the battery 20 that can prevent a decrease in performance. Furthermore, the solid electrolyte layer provided in the battery cell 11 by applying a fastening pressure from the outside of the container 21 having a strength capable of withstanding the pressure, more specifically, from the direction intersecting the upper surface 21xu and the lower surface 21yu. It is possible to reduce the resistance at the interface between the positive electrode layer and the negative electrode layer. Therefore, according to this invention concerning 2nd Embodiment, the battery 20 which can improve performance by providing fastening pressure, and its manufacturing method can be provided.

  In the battery 20, the same material as that of the container 12 can be used as a constituent material of the container 21 (the lower lid 21 x and the upper lid 21 y).

  In the above description of the present invention, the form in which the battery cell is inserted and arranged from the largest opening of the lower lid or the upper lid is illustrated, but the battery manufacturing method of the present invention is not limited to this form. For example, when manufacturing the battery 10, the battery cell may be inserted from an opening in which the side surface portion 21 c and the side surface portion 21 d are to be disposed. However, from the viewpoint of making the form easy to improve productivity, it is preferable to include an arrangement step in which the battery cell is inserted from the largest opening of the lower lid or the upper lid.

  Moreover, in the said description regarding this invention, although the terminal cell connection process was performed after the terminal side surface fixing process and the arrangement | positioning process was performed after a terminal cell connection process, the battery of this invention, and its manufacturing method (henceforth) However, the present invention is not limited to this form. This invention can also be set as the form by which a terminal side surface fixing process is performed after a terminal cell connection process. When manufacturing the battery 10, for example, after the battery cell 11 is arranged in the lower lid 12a, the terminals 13 and 14 are connected to the battery cell 11, and then the terminals 13 and 14 are fixed to the side surface portion 12d. It is also possible to adopt a form.

  Moreover, although the form which fixes a terminal and the side surface of a container with the method which combined welding and crimping was illustrated in the said description regarding this invention, this invention is not limited to the said form. In the present invention, if the sealing of the container can be ensured and the terminal and the side surface of the container can be fixed so that the battery cell accommodated in the container and connected to the terminal does not move, it is fixed by another method. It is also possible to do.

  Moreover, although the form which connects a terminal and a battery cell by ultrasonic welding or laser welding was illustrated in the said description regarding this invention, this invention is not limited to the said form. In this invention, if a terminal and a battery cell can be connected with the form which can reduce electronic conduction resistance, it is also possible to connect by another method.

  Moreover, in the said description regarding this invention, although the side surface of a lower cover and the side surface of an upper cover were illustrated by the laser welding, this invention is not limited to the said form. In the present invention, the side surface of the lower lid and the side surface of the upper lid can be joined by other methods as long as they can be joined in a form that can ensure the hermeticity of the container.

  Moreover, in the said description regarding the battery 10 and its manufacturing method, although the form which used the side part 12c and the side part 12d which were drawn was illustrated, the container formed by joining 4 members is provided. The battery and the manufacturing method thereof according to the present invention are not limited to the embodiment. The pair of side surfaces need not be drawn. However, from the viewpoint of making it easy to join the lower lid 12a and the upper lid 12b, it is preferable to use a pair of side portions subjected to drawing.

  Moreover, in the said description regarding the battery 20 and its manufacturing method, although the form in which the side surfaces of a lower lid and the side surfaces of an upper lid were joined by laser welding was illustrated, the form provided with the container formed by joining 2 members The battery of the present invention and the method for producing the same are not limited to this embodiment. If it can join so that the sealing property of a container can finally be ensured, it is also possible to join the side surfaces of a lower lid and the side surfaces of an upper lid by another method.

  Moreover, in the said description regarding this invention, although the form in which one battery cell was accommodated in the container was illustrated, this invention is not limited to the said form. The present invention may be configured such that a plurality of battery cells are accommodated in a container.

  Moreover, although the battery 10 and 20 in which the battery cell 11 which has a solid electrolyte layer was accommodated in the container 12 or the container 21 was illustrated in the said description regarding this invention, this invention is not limited to the said form. In the present invention, in addition to the solid electrolyte layer or in place of the solid electrolyte layer, an electrolyte layer using a known electrolytic solution may be disposed between the positive electrode layer and the negative electrode layer. is there.

  The battery of the present invention can be used for an electric vehicle, a hybrid vehicle, and the like, and the battery manufacturing method of the present invention can be used for manufacturing a battery used for an electric vehicle, a hybrid vehicle, and the like.

DESCRIPTION OF SYMBOLS 10 ... Battery 11 ... Battery cell 12 ... Container 12a ... Lower lid 12ax ... Lower surface 12ay, 12az ... Side surface 12b ... Upper lid 12bx ... Upper surface 12by, 12bz ... Side surface 12c, 12d ... Side surface part 13, 14 ... Terminal 15 ... Hole 20 ... Battery 21 ... Container 21x ... Lower lid 21xa, 21xb, 21xc, 21xd ... Side 21y ... Upper lid 21ya, 21yb, 21yc, 21yd ... Side 22 ... Notch 23 ... Hole

Claims (3)

A battery comprising a battery cell and a container for housing the battery cell,
The container includes a lower lid having a lower surface, a side surface standing from the lower surface, and an opening provided on the upper surface side, and an upper surface, a side surface standing from the upper surface, and an opening provided on the lower surface side. Having an upper lid,
The side surface of the lower lid and the side surface of the upper lid are superimposed,
The battery is characterized in that a terminal connected to the battery cell accommodated in the container is fixed to a member constituting a side surface of the container. A lower lid having a lower surface, a side surface standing from the lower surface and an opening provided on the upper surface side, and an upper lid having an upper surface, a side surface standing from the upper surface and an opening provided on the lower surface side A battery, a battery cell accommodated in the container, and a method of manufacturing a battery comprising a terminal connected to the battery cell and fixed to a side surface of the container,
A terminal side surface fixing step of fixing the terminal to a member that constitutes a side surface of the container;
A terminal cell connection step for connecting the terminal and the battery cell;
Arranging the battery cell from the direction intersecting the upper surface of the upper lid into the upper lid, or arranging the battery cell from the direction intersecting the lower surface of the lower lid into the lower lid. When,
After the terminal side surface fixing step, the terminal cell connecting step, and the arranging step, the lower lid is disposed so as to cover the lower side of the battery cell, or the upper lid is covered so as to cover the upper side of the battery cell. And overlaying the side surface of the lower lid and the side surface of the upper lid,
Sealing the container through a process of joining the side surface of the overlapped lower lid and the side surface of the upper lid;
A method for producing a battery, comprising: The battery manufacturing method according to claim 2, wherein the container has a rectangular parallelepiped shape, and a lower surface and an upper surface of the container are larger than a side surface of the container.

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