JP2009245819A - Stack type battery, manufacturing jig for stack type electrode group and manufacturing method of the stack type battery using the jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamination type battery which has improved reliability and productivity, by making a smooth electrical connection between current collector terminals when a battery pack is assembled by using a plenty of batteries, and to provide a manufacturing jig of a laminated battery group and a manufacturing method of the laminated type battery by using the jig. <P>SOLUTION: In the laminated type battery, there is arranged a spacer 30 which has a length substantially identical to the width of a laminate electrode body 10 and exists at substantially the same position as with both side-surfaces of the laminate electrode body 10, in a space existing between an inner side-surface of a laminate external package body 25, which exists at a portion where both the current collector terminals 15, 16 extrude and the laminate electrode body 10; and on both the current collector terminals 15, 16, there are formed positioning penetration holes 15a, 16a; and meanwhile, locking-positioning projections 32c, 33c which position-fit to the penetrationholes 15a, 16a are arranged, at positions that correspond to the positioning penetration holes 15a, 16a on the spacer 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stacked battery used for, for example, a robot, an electric vehicle, a backup power source, and the like, and a manufacturing method thereof, and more particularly, a stacked lithium ion battery capable of improving charge / discharge characteristics at a high rate and a manufacturing method thereof. About.

  In recent years, batteries have been used not only for power sources of mobile information terminals such as mobile phones, notebook personal computers, and PDAs, but also for robots, electric vehicles, backup power sources, etc., and further increase in capacity is required. It has become like this. In response to such demands, lithium ion batteries have a high energy density and high capacity, and are therefore widely used as drive power sources as described above.

  Battery types of such a lithium ion battery are roughly classified into a cylindrical type in which a spiral electrode body is enclosed in a bottomed cylindrical exterior body, and a laminated electrode body in which a plurality of rectangular electrodes are stacked. There is a laminated type encapsulated in a rectangular outer package or a laminate outer package produced by welding one or two laminated films.

  Among these lithium ion batteries, in a laminated battery sealed in a laminate outer package, a sheet-like positive electrode plate having a positive electrode current collecting tab and a sheet-like negative electrode plate having a negative electrode current collecting tab are interposed via a separator. The positive electrode current collecting tab is welded to the positive electrode current collector terminal in a superimposed state, while the negative electrode current collector tab is superimposed on the negative electrode current collector terminal. The current collecting terminals are welded and project from the laminate outer package.

  In the battery having the above structure, the positioning of the positive current collecting tab and the positive current collecting terminal and the negative current collecting are performed when the positive current collecting tab and the positive current collecting terminal are welded and when the negative current collecting tab and the negative current collecting terminal are welded. The tab and the negative electrode current collecting terminal were positioned visually. For this reason, the relative position between the positive electrode current collecting tab and the positive electrode current collecting terminal and the relative position between the negative electrode current collecting tab and the negative electrode current collecting terminal are different for each battery, and both current collecting terminals protrude from the laminate outer package. The position of the battery and the distance between the current collecting terminals differed from battery to battery. As a result, when making a battery pack using a large number of unit cells, electrical connection between the current collecting terminals cannot be smoothly performed, and there is a problem that reliability and productivity are lowered. .

  In addition, the projecting piece is turned to the outside of the stacked current collecting tabs, and a plurality of current collecting tabs are bundled at the same time, and welding electrodes are applied through the projecting pieces, and between the current collecting tabs, There has been proposed a technique for welding and integrating between the projecting pieces (see Patent Document 1 below). However, this technique is simply a technique for integrating the current collecting tabs and is not a technique for facilitating the positioning of the current collecting tabs and the current collecting terminals.

JP-A-8-167408

  The present invention has been made in consideration of the above-described problems. When an assembled battery is formed using a large number of batteries, the electrical connection between the current collecting terminals can be smoothly performed, thereby improving reliability and productivity. It is an object of the present invention to provide a laminated battery, a laminated electrode body group production jig, and a method for producing a laminated battery using the jig, which can be improved.

  In order to achieve the above object, the present invention provides a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab, alternately through separators. The laminated electrode body has a laminated electrode body, and the laminated electrode body is formed by welding together the peripheral edges of a laminate film including a metal layer and a resin layer together with an electrolyte solution. In addition, the positive current collecting tab is joined to the positive current collecting terminal in a superimposed state, and the negative current collecting tab is joined to the negative current collecting terminal in a superimposed state. In the projecting stacked battery, the space between the inner surface of the laminate outer package and the stacked electrode body present at the projecting portions of the current collector terminals and the width of the stacked electrode body Approximate length and both ends up Spacers that are present at substantially the same positions as both side surfaces of the laminated electrode body are disposed, and both current collecting terminals are formed with alignment through holes, while the alignment through holes in the spacers are formed in the alignment through holes. The corresponding position is provided with an alignment protrusion that fits into the through hole.

  The spacer disposed in the space existing between the inner surface of the laminate outer package and the laminated electrode body has a length substantially the same as the width of the laminated electrode body, and both ends are opposite to the both side surfaces of the laminated electrode body. Since the relative position between the laminated electrode body and the spacer is determined if they are at substantially the same position, the relative position between the positive electrode current collecting tab and the spacer extended from the positive electrode constituting a part of the laminated electrode body And the relative position of the negative electrode current collection tab extended from the negative electrode which comprises a part of laminated electrode body, and a spacer is also determined. In addition, since the through holes for alignment are formed in both current collecting terminals, the alignment protrusions that fit into the through holes are provided at positions corresponding to the through holes for alignment in the spacer. A relative position between the electric terminal and the spacer and a relative position between the negative electrode current collecting terminal and the spacer are determined. From these things, the relative position of a positive electrode current collection tab and a positive electrode current collection terminal and a negative electrode current collection tab and a negative electrode current collection terminal is determined via a spacer. Therefore, since it can suppress that the position which both the current collection terminals protrude from a laminate exterior body, the distance between both current collection terminals, etc. for every battery, it can carry out battery assembly using many batteries. At this time, electrical connection between the current collecting terminals can be performed smoothly, and deterioration of reliability and productivity of the assembled battery can be suppressed.

It is desirable that an inward movement restricting projection for restricting the inward movement of both current collecting terminals is provided at a position corresponding to the current collecting terminals in the spacer.
Although the movement of both current collecting terminals is suppressed by the alignment through-holes formed in both current collecting terminals and the alignment protrusion formed in the spacer, the position corresponding to between the current collecting terminals in the spacer If the inward movement restricting projections are formed on the two, the inward movement of both current collecting terminals can be suppressed more reliably. Also, if the inward movement restricting protrusion is provided, the inward movement of both current collecting terminals can be suppressed even if the alignment through-hole is made slightly larger than the alignment protrusion. The workability at the time of fitting the alignment protrusion into the alignment through hole is improved while suppressing the decrease in productivity and productivity.

It is desirable that an outward movement restricting projection for restricting the outward movement of both current collecting terminals is provided on the outer side of the spacer in contact with the both current collecting terminals.
For the same reason as in the case of the inward movement restricting projection, it is possible to more reliably suppress the movement of both current collecting terminals and to improve the workability when fitting the alignment projection into the alignment through hole.

Both are joined in a state where the positive current collecting tab is superimposed on both surfaces of the positive current collecting terminal, while both are joined in a state where the negative current collecting tab is superimposed on both sides of the negative current collecting terminal, In addition, spacers are arranged on both surfaces of the current collecting terminals, and the alignment protrusion is provided in one spacer, and the alignment protrusion is fitted in the other spacer. It is desirable to be provided.
If both current collector terminals are sandwiched between two spacers, both current collector terminals are more securely fixed, and one spacer is provided with the above-mentioned alignment projection, and the other spacer is positioned. If the alignment hole into which the alignment protrusion fits is provided, the alignment between the spacers can be ensured.

A state in which the positive electrode current collector tab is overlapped only on one surface of the positive electrode current collector terminal and the both are joined, while a state in which the negative electrode current collector tab is overlapped only on one surface of the negative electrode current collector terminal It is desirable that the spacer is disposed only on the surface where the two are joined and the joint portions of the two current collecting terminals are present.
If it is the said structure, since only one spacer is sufficient, the manufacturing cost of a battery can be reduced.

  A laminated electrode body in which a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab are alternately laminated via a separator, the positive electrode current collector A positive current collecting terminal to which the tab is joined in an overlapping state, a negative current collecting terminal to which the negative current collecting tab is joined in an overlapping state, and an insulating spacer disposed in the vicinity of the joining portion of both current collecting tabs, A laminated electrode body group making jig for producing a laminated electrode body group by integrating, and having substantially the same shape as the shape in which the spacers are arranged in a portion where both current collecting tabs of the laminated electrode body are extended. A first recessed portion formed, and two second recessed portions having substantially the same shape as the positive current collecting terminal and the negative current collecting terminal, and a joining portion between the positive current collecting tab and the positive current collecting terminal And corresponding to the joining part of the negative electrode current collector tab and the negative electrode current collector terminal That is a portion wherein the bonding device through hole for inserting a bonding device is formed.

  If the first recess having substantially the same shape as the spacer is disposed at the portion where the current collecting tabs of the laminated electrode body are extended, the relative position between the laminated electrode body and the spacer is determined. Therefore, the relative positions of the current collecting tabs and the spacers respectively extending from the positive and negative electrodes constituting a part of the laminated electrode body are also determined. Further, if two second recesses having substantially the same shape as the positive electrode current collector terminal and the negative electrode current collector terminal are formed, the relative positions of both the current collector terminals and the spacers, and both the current collector terminals and the both current collectors The relative position to the tab will be determined. Therefore, since it can suppress that the position where both the current collection terminals protrude from a laminate exterior body, the distance between both current collection terminals, etc. for every battery, when carrying out assembled battery using many batteries Thus, electrical connection between the current collecting terminals can be performed smoothly, and deterioration of the reliability and productivity of the assembled battery can be suppressed.

  A method for manufacturing a laminated battery using the above-mentioned laminated electrode body group production jig, comprising: a plurality of positive electrode plates with a positive current collector tab extended; and a plurality of negative electrode plates with a negative electrode current collector tab extended. A laminated electrode body production step of producing a plate-like laminated electrode body by alternately laminating through separators, a bonding device through-hole for inserting a bonding device, and a spacer and the laminated electrode body The positive electrode current collector terminal and the negative electrode current collector terminal are respectively placed in the second concave portion and placed in the first concave portion, and then the bonding electrode through holes formed in the laminated electrode body group production jig and the spacer By inserting a joining device, the positive electrode current collecting tab and the positive electrode current collecting terminal in an overlapped state are joined, and the negative electrode current collecting tab and the negative electrode current collecting terminal in an overlapped state are joined to each other to form a laminated electrode A laminated electrode body group producing step for producing a body group; After the laminated electrode body group is disposed in the laminate recess of the laminate film, a welding step of welding the peripheral edges of the laminate film leaving a part, and electrolysis from the opening of the laminate exterior body constituted by the laminate film A liquid injection step of injecting a liquid; and a sealing step of sealing an opening of the laminate outer package while maintaining a reduced pressure inside the laminate outer package.

  According to the present invention, when an assembled battery is formed using a large number of batteries, electrical connection between current collecting terminals can be smoothly performed, thereby improving reliability and productivity. Excellent effect.

  Hereinafter, a stacked battery (rectangular lithium ion battery) according to an example of the present invention will be described with reference to FIGS. The laminated battery according to the present invention is not limited to those shown in the following embodiments, and can be implemented with appropriate modifications within a range not changing the gist thereof.

(Structure of stacked battery)
As shown in FIG. 1, the laminated battery has a laminated electrode body 10, and this laminated electrode body 10 is composed of two separators, a bag-like separator 3 having a positive electrode plate 1 disposed therein, and a negative electrode plate. 2 is laminated, and the negative electrode plate 2 is arranged at the outermost position. Thus, since the negative electrode plate 2 is arranged at the outermost position, the number of the negative electrode plates 2 is configured to be one more than the number of the positive electrode plates 1 (specifically, the positive electrode plate 1 is 50 sheets and 51 negative electrode plates 2).

  Further, as shown in FIG. 5, the laminated electrode body 10 is formed on the outer peripheral portion of the laminated electrode body 10 (immediately after the production of the laminated electrode body, that is, the thickness L11 is 12 mm before being housed in the housing space of the laminated exterior body). The tape 5 for suppressing the shift | offset | difference of each electrode plates 1 and 2 is stuck so that it may straddle. Further, the laminated electrode body 10 is sealed together with an electrolytic solution in a storage space of a laminated exterior body 25 formed by welding two laminated films 28 as shown in FIG. From the body 25, a positive electrode current collecting terminal 15 made of an aluminum plate (thickness: 0.5 mm) and a negative electrode current collecting terminal 16 made of a copper plate (thickness: 0.5 mm) are projected. As shown in FIG. 12, the positive electrode current collecting terminal 15 is formed with an alignment through hole 15a through which an alignment protrusion 32c formed in a spacer 30 described later is inserted. The terminal 16 is formed with an alignment through-hole 16a through which an alignment projection 33c formed on a spacer 30 described later is inserted. The laminate film 28 has a structure in which a resin layer is formed on both sides of an aluminum foil, and reference numeral 27 in FIG. 2 and FIG. 6 described later is a welded portion of the two laminate films 28.

As shown in FIG. 3A, the positive electrode plate 1 has a positive electrode active material made of LiCoO _{2 on} the entire surface of both sides of a positive electrode conductive core made of a rectangular aluminum foil (thickness: 15 μm). A positive electrode active material layer 1a composed of a conductive agent made of carbon black and a binder made of polyvinylidene fluoride is provided. The positive electrode plate 1 has a width L1 of 95 mm and a height L2 of 95 mm. Further, from one side of the positive electrode plate 1, the positive electrode active material layer 1a is integrally formed with the positive electrode conductive core. The positive electrode current collection tab 11 (width L3 is 30 mm, height L4 is 20 mm) which is not provided has a structure protruding. The positive electrode current collecting tab 11 is overlaid on both surfaces of the positive electrode current collector terminal 15 (width L14 is 30 mm) (in a state where 25 sheets are overlaid on each surface of the positive electrode current collector terminal 15). It is welded to the current collecting terminal 15.

  As shown in FIG. 3 (c), the bag-shaped separator 3 is formed by superposing two polypropylene (PP) separators 3a and fusing the separators 3a around each other at the periphery of the separators 3a. It is the structure which provides. With such a configuration, the positive electrode plate 1 can be stored in the bag-like separator 3. As shown in FIG. 3B, the separator 3a has a rectangular shape with a height L5 of 100 mm, a width L6 of 100 mm, and a thickness of 30 μm.

  As shown in FIG. 4, the negative electrode plate 2 has a negative electrode active material made of natural graphite and polyvinylidene fluoride on both surfaces of a negative electrode conductive core made of a rectangular copper foil (thickness: 10 μm). The negative electrode active material layer 2a comprised from the binder which consists of is provided. The negative electrode plate 2 has a width L7 of 100 mm and a height L8 of 100 mm, which is the same size as the separator 3a. Further, from one side of the negative electrode plate 2, a negative electrode current collecting tab 12 that is integrally formed with the negative electrode conductive core and is not provided with the negative electrode active material layer 2a (width L9 is 30 mm, height L10 is 20 mm). ) Protrudes. The negative electrode current collecting tabs 12 are overlaid on both surfaces of the negative electrode current collector terminal 16 (width L14 is 30 mm) (25 sheets on one surface of the negative electrode current collector terminal 16 and 26 sheets on the other surface). In this state, the negative electrode current collector terminal 16 is welded.

  Here, as shown in FIG. 6 and FIG. 7, in addition to the laminated electrode body 10, both the current collecting tabs are provided in the storage space 18 of the laminated exterior body 25 composed of the two laminated films 28. Two insulating spacers 30 and 40 are arranged so as to sandwich the current collecting terminals 11 and 12 and the current collecting terminals 15 and 16. More specifically, the spacers 30 and 40 are spaces existing between the inner surface of the laminate outer package 25 from which the current collector terminals 15 and 16 protrude and the laminated electrode body 10, Arranged in a space excluding the overlapping portion 35 of the current collecting tabs 11 and 12 (in FIG. 7, only the overlapping portion 35 of the positive electrode collecting tab 11 is shown, but the negative electrode collecting tab 12 is also the same). ing. Reference numeral 50 in FIG. 6 denotes a resin portion made of an unstretched polyolefin material, which covers both current collecting terminals 15 and 16 existing at the welding position of the laminate outer package. Due to the presence of the resin portion 50, the welded portion of the laminate film where the current collecting terminals 15 and 16 are present can be reliably sealed.

  As shown in FIGS. 8 and 9A to 9C, the specific structure of the spacer 30 among the spacers 30 and 40 is such that the length L20 is 98 mm, the width L21 is 17 mm, and the height L22 is 6 mm. And the inward movement restricting protrusion 31 provided in the central portion, and the current collecting tab abutting portions 32 and 33 (lengths L24 and L25) provided on both sides of the inward movement restricting protrusion 31. Are both 33 mm). The inward movement restricting projection 31 has a length L23 of 32 mm, and is formed to be substantially equal to the distance between the current collecting terminals 15 and 16. Thereby, it can suppress that both the current collection terminals 15 and 16 move inward. Also, outward movement restricting projections 32a and 33a are formed at the ends of the current collecting tab contact portions 32 and 33, respectively, so that the current collecting terminals 15 and 16 are directed outward. It can suppress moving.

  In this embodiment, since the widths L27 and L28 of the outward movement restricting protrusions 32a and 33a are both 3 mm, the inward movement restricting protrusion 31 and the outward movement restricting protrusion The distance L29 between the current collecting terminals 15 and 16 and the distance L30 between the inward movement restricting protrusion 31 and the outward movement restricting protrusion 33a are both 30 mm, and the widths L13 and L14 ( 6), the current collecting terminals 15 and 16 can be reliably prevented from moving inward and outward. The heights of the outward movement restricting projections 32a and 33a and the step between the inward movement restricting projection 31 and the current collecting tab contact portions 32 and 33 are the same, and specifically, L26. = 0.5 mm.

  Furthermore, two through-holes 32b and 33b for ultrasonic welding devices for inserting an anvil of an ultrasonic welding device (joining device) described later are formed in the current collecting tab contact portions 32 and 33, respectively. An alignment projection 32c is formed between the two ultrasonic welding device through holes 32b, and an alignment projection 33c is formed between the two ultrasonic welding device through holes 33b. The alignment protrusion 32 c is inserted through the alignment through hole 15 a formed in the positive current collector terminal 15, and the alignment protrusion 33 c is formed in the negative current collector terminal 16. As a result, the spacer 30 (laminated electrode body 10) and the current collecting terminals 15 and 16 are accurately aligned. The current collecting tab abutting portions 32 and 33 on the laminated electrode body 10 side are provided with R portions 32d and 33d, respectively, thereby preventing a large load from being applied to the current collecting tabs 11 and 12. ing.

  On the other hand, as shown in FIG. 10, the spacer 40 includes a movement restricting projection 41 and current collecting tab abutting portions 42 and 43 provided on both sides of the inward movement restricting projection 41. And outward movement restricting projections 42a and 43a are formed at the ends of the current collecting tab contact portions 42 and 43, respectively, and the configuration is the same as that of the spacer 30. Various dimensions are the same as those of the spacer 30. However, the through holes 32b and 33b for the ultrasonic welding apparatus are not formed, and instead of the alignment protrusions 32c and 33c, the alignment through holes 42c and 43c (the formation site is the alignment protrusion 32c, This is different in that a portion corresponding to 33c is formed.

  Note that the depths of the storage recesses of the two laminate films 28 (before welding) are both 5 mm, and the sum of these depths is the value before being stored in the storage space 18 of the laminate outer package 25. It is smaller than the thickness L11 (12 mm) of the laminated electrode body 10. With such a configuration, when the laminate film 28 is welded to produce the laminate outer package 25, a large force is applied in the stacking direction of the stacked electrode body 10, so that the shift of the stacked electrode body 10 can be suppressed. .

Moreover, the laminated electrode body group preparation jig used when manufacturing the battery of the said structure is demonstrated below.
As shown in FIG. 12, the laminated electrode body group fabrication jig 60 includes a first recess 61 having substantially the same shape as the spacer 30 disposed in the laminated electrode body 10, the positive electrode current collecting terminal 15, Second concave portions 62 and 63 having substantially the same shape as the negative electrode current collecting terminal 16 and shallower than the first concave portion 61 are formed. The specific size of the first recess 61 is substantially the same as the width L35 of the laminated electrode body 10 (the same width as the width L6 of the separator 3 and the width L7 of the negative electrode 2) (about 100 mm). The height L36 is substantially the same as the length obtained by adding the width L21 of the spacer 30 to the height of the laminated electrode body 10 (the same height as the height L5 of the separator 3 and the height L8 of the negative electrode 2) ( About 117 mm). Further, in the laminated electrode body group production jig 60, a portion corresponding to a welded portion between the positive electrode current collecting tab 11 and the positive electrode current collecting terminal 15 and a welded portion between the negative electrode current collector tab 12 and the negative electrode current collecting terminal 16. The through-hole 64 for ultrasonic welding apparatuses for inserting the anvil of an ultrasonic welding apparatus (joining apparatus) is formed.

(Preparation method of prismatic lithium ion battery)
[Preparation of a bag-shaped separator containing a positive electrode plate]
90% by mass of LiCoO ₂ as a positive electrode active material, 5% by mass of carbon black as a conductive agent, 5% by mass of polyvinylidene fluoride as a binder, N-methyl-2-pyrrolidone as a solvent ( NMP) solution was mixed to prepare a positive electrode slurry. Next, this positive electrode slurry was applied to both surfaces of an aluminum foil (thickness: 15 μm) as a positive electrode current collector. Then, after drying the solvent and compressing to a thickness of 0.1 mm with a roller, the positive electrode plate 1 was produced by cutting so as to have the above-described width L1 and height L2 and the positive electrode current collecting tab 11 protruding. Finally, after arranging the positive electrode plate 1 between the two separators 3a, the peripheral edges of the separator 3a were welded together to produce a bag-like separator 3.

(Production of negative electrode plate)
A slurry was prepared by mixing 95% by mass of natural graphite powder as a negative electrode active material, 5% by mass of polyvinylidene fluoride as a binder, and an NMP solution as a solvent. It apply | coated on both surfaces of the copper foil (thickness: 10 micrometers) as a body. Then, after drying the solvent and compressing to a thickness of 0.08 mm with a roller, the negative electrode plate 2 was produced by cutting so as to have the above-described width L7 and height L8 and the negative electrode current collecting tab 12 protruding.

[Production of battery]
The negative electrode plate 2 (51 sheets) obtained as described above and the bag-shaped separator 3 (50 sheets) in which the positive electrode plate 1 was housed were alternately laminated to produce a laminated electrode body 10. Note that the negative electrode plate 2 was disposed at the end of the laminated electrode body 10 in the laminating direction. Next, on the four sides of the laminated electrode body 10, a slip prevention tape 5 was stuck so as to straddle the laminated electrode body 10.

  Next, as shown in FIGS. 12 and 13, the spacer 30 and the laminated electrode body 10 are disposed in the first recess 61 of the laminated electrode body group fabrication jig 60, and the alignment protrusions 32 c and 33 c are respectively used for alignment. The positive electrode current collector terminal 15 and the negative electrode current collector terminal 16 were respectively disposed in the second recesses 62 and 63 while being inserted through the through holes 15a and 16a. At this time, the positive electrode current collecting tabs 11 are arranged so that 25 sheets are stacked on the front and back surfaces of the positive electrode current collecting terminals 15, and the negative electrode current collecting tabs 12 are arranged on the front and back surfaces of the negative electrode current collecting terminals 16. It arrange | positioned so that it might be in the state which piled up 26 sheets. Thereafter, the anvil of the ultrasonic welding device (joining device) is inserted from the through hole 64 for the ultrasonic welding device of the multilayer electrode body group production jig 60 and the through holes 32b and 33b for the ultrasonic welding device of the spacer 30, In a state where the positive current collecting tab 11 is pressed against the positive current collecting terminal 15 and the negative current collecting tab 12 is pressed against the negative current collecting terminal 16, both current collecting tabs 11, 12 are placed on one surface of both current collecting terminals 15, 16. Were ultrasonically welded. Thereafter, the current collecting tabs 11 and 12 are ultrasonically welded to the other surfaces of the current collecting terminals 15 and 16, and the upper surfaces of the movement restricting protrusion 31 and the outward movement restricting protrusions 32a and 33a. After the adhesive is applied, the alignment through holes 42c and 43c are inserted into the alignment protrusions 32c and 33c, respectively, and the spacer 30 and the spacer 40 are bonded to each other as shown in FIG. 70 was produced.

Thereafter, after the laminated electrode body group 70 is disposed in the storage space of the laminate outer package 25, both the current collecting terminals 15, with the positive electrode current collecting terminal 15 and the negative electrode current collecting terminal 16 projecting from the laminate film 28, Laminate films 28 on the side where 16 is present were welded together. Then, the laminated electrode body group 70 was disposed in the laminate outer package 25 by welding two of the remaining three sides of the laminate film 28. Finally, after injecting a non-aqueous electrolyte from the opening of the laminate outer package 25, in the state where the internal pressure of the laminate outer package 25 is regulated to be 30 torr or less, the opening of the laminate outer package 25 (of the laminate film) A stacked battery was prepared by welding the remaining one side). As the non-aqueous electrolyte, a mixed solvent in which ethylene carbonate (EC) and methyl ethyl carbonate (MEC) are mixed at a volume ratio of 30:70, LiPF ₆ is 1 M (mol / liter). What was melt | dissolved in the ratio was used.

(Other matters)
(1) In the above embodiment, the spacer 40 is not provided with through holes for ultrasonic welding equipment, but as shown in FIG. 14, it has a structure in which through holes 42b and 43b for ultrasonic welding equipment are provided. Also good. With such a structure, there is an effect that both current collecting tabs 11 and 12 can be ultrasonically welded to both surfaces of both current collecting terminals 15 and 16 at a time.

(2) In the above-described embodiment, the storage concave portion constituting the storage space is provided in both of the two laminate films 28. However, the present invention is not limited to such a structure, and as shown in FIG. It is also possible to provide a structure in which a storage recess that forms a storage space is provided only in the film 28a, and a storage recess that forms a storage space is not provided in the other laminate film 28b. In this case, since the welded portions between the current collecting tabs 11 and 12 and the current collecting terminals 15 and 16 are formed only on one surface of the current collecting terminals 15 and 16, as shown in FIG. As the spacer 30, only one spacer having a large height may be used. Moreover, as for the laminated electrode body group preparation jig 60 used in this case, as shown in FIG. 17, it is desirable for the 1st recessed part 61 to have a deep bottom shape (substantially equivalent to the thickness of the laminated electrode body 10). In addition, the code | symbol 39 in FIG. 15 is a resin-made sheet | seat.
Further, it is not always necessary to use two laminated films 28, and the laminated outer package 25 may be configured by folding back one laminated film 28.

(3) In the above embodiment, the R portions 32d and 33d are formed on the spacer 30, but the present invention is not limited to such a structure. As shown in FIG. 18, the spacer 30 has R portions 32d and 33d. A structure that is not formed may be used.

(4) As shown in FIG. 19, if the electrolyte solution storage hole 80 that opens in the direction of the stacked electrode body 10 of the spacer 30 is formed, the electrolyte solution stored in the electrolyte solution storage hole 80 is used as the stacked electrode. The body 10 can be supplied. Therefore, since the problem that the amount of electrolyte in the battery is insufficient is alleviated, it is possible to suppress a decrease in battery capacity and a decrease in cycle characteristics during discharge even when charging / discharging at a high rate. it can.

(5) In the above embodiment, the spacer 30 and the spacer 40 are fixed with an adhesive. However, the present invention is not limited to such a structure, and the spacer 30 is positioned in the alignment through holes 42c and 43c. It is also possible to fix the spacer 30 and the spacer 40 by fitting the alignment protrusions 32c and 33c.

(6) The positive electrode active material is not limited to the above LiCoO ₂ , but may be LiNiO ₂ , LiMnO _4, or a composite thereof, and the negative electrode active material is not limited to the above natural graphite. , Artificial graphite, Si, or the like.

(7) In the above embodiment, the negative electrode active material layers 2a are formed on both surfaces of the negative electrode conductive core for all the negative electrode plates 2, but the negative electrode active material layers (specifically, not facing the positive electrode plate) May not have a negative electrode active material layer) present on the outer side of the outermost negative electrode plate. And if it is such a structure, since the thickness of the laminated electrode body 10 becomes small, the high capacity density of a battery can be achieved.

  The present invention can be applied to, for example, a battery used for a robot, an electric vehicle, a backup power source, and the like.

It is a disassembled perspective view of the laminated electrode body used for the laminated battery of this invention. It is a perspective view of the laminated battery of the present invention. It is a figure which shows a part of laminated battery of this invention, Comprising: The figure (a) is a top view of a positive electrode, The figure (b) is a perspective view of a separator, The figure (c) is a positive electrode arrange | positioned inside. It is a top view which shows the bag-shaped separator. It is a top view of the negative electrode used for the laminated battery of this invention. It is a perspective view of the laminated electrode body used for the laminated battery of this invention. It is explanatory drawing when the laminated battery of this invention is seen from the front. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a perspective view of one spacer used for the laminated battery of the present invention. It is a figure which shows one spacer used for the laminated battery of this invention, Comprising: The figure (a) is a front view, The figure (b) is a top view, The figure (c) is a side view. It is a perspective view of the other spacer used for the laminated battery of this invention. It is a perspective view which shows the laminated electrode body group used for the laminated battery of this invention. It is explanatory drawing which shows the method of manufacturing the laminated battery of this invention using a laminated electrode body group preparation jig. It is explanatory drawing which shows the method of manufacturing the laminated battery of this invention using a laminated electrode body group preparation jig. It is a perspective view which shows the modification of the other spacer used for the laminated battery of this invention. It is sectional drawing which shows the modification of the laminated battery of this invention. It is a perspective view which shows the modification of one spacer used for the laminated battery of this invention. It is explanatory drawing which shows the method of manufacturing the laminated battery which concerns on the modification of this invention using a laminated electrode body group production jig. It is a perspective view which shows the modification of one spacer used for the laminated battery of this invention. It is a perspective view which shows the modification of one spacer used for the laminated battery of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Positive electrode plate 2: Negative electrode plate 3: Separator 4: Separator welding part 10: Laminated electrode body 11: Positive electrode current collection tab 12: Negative electrode current collection tab 15: Positive electrode current collection terminal 16: Negative electrode current collection terminal 15a, 16a: Position Through hole for alignment 25: Laminate exterior body 27: Laminate sealing part 28: Laminate film 30: Spacer 31: Protrusion part for movement restriction 32a, 33a: Protrusion part for outward movement restriction 32b, 33b: Through hole for ultrasonic welding apparatus Holes 32c, 33c: Positioning protrusions 42c, 43c: Positioning through holes 60: Laminated electrode body group fabrication jig 61: First recessed part 62, 63: Second recessed part 64: Through hole for ultrasonic welding apparatus

Claims (7)

A plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab each having a laminated electrode body laminated alternately via separators; and The laminated electrode body is disposed in a storage space of a laminate outer body formed by welding together peripheral edges of a laminate film having a metal layer and a resin layer together with an electrolyte, and the positive electrode current collecting tab Is a laminated battery that is joined to the positive current collector terminal in a superimposed state, the negative current collector tab is joined to the negative current collector terminal in a superimposed state, and both the current collector terminals protrude from the laminate outer package,
In the space existing between the inner surface of the laminate outer package and the laminated electrode body present at the portion where the current collector terminals protrude, the both ends of the laminated electrode body are substantially the same length as the width of the laminated electrode body. Are disposed at substantially the same position as both side surfaces of the multilayer electrode body, and the through holes for alignment are formed in the current collecting terminals, while the alignment through holes in the spacer are formed. A laminated battery, characterized in that an alignment protrusion that fits into the through hole is provided at a position corresponding to the hole.   2. The stacked battery according to claim 1, wherein an inward movement restricting protrusion for restricting inward movement of both current collecting terminals is provided at a position corresponding to between the two current collecting terminals in the spacer.   The outward movement restricting projection for restricting the outward movement of both current collecting terminals is provided on the outer side of the contact position between the current collecting terminals in the spacer. Stacked battery.   Both are joined in a state where the positive current collecting tab is superimposed on both surfaces of the positive current collecting terminal, while both are joined in a state where the negative current collecting tab is superimposed on both sides of the negative current collecting terminal, In addition, spacers are arranged on both surfaces of the current collecting terminals, and the alignment protrusion is provided in one spacer, and the alignment protrusion is fitted in the other spacer. The laminated battery according to any one of claims 1 to 3, wherein the battery is provided.   A state in which the positive electrode current collector tab is overlapped only on one surface of the positive electrode current collector terminal and the both are joined, while a state in which the negative electrode current collector tab is overlapped only on one surface of the negative electrode current collector terminal The laminated battery according to any one of claims 1 to 3, wherein the spacers are disposed only on a surface where both are joined together and a joining portion is present in the current collecting terminals. A laminated electrode body in which a plurality of positive electrode plates each extending from a positive electrode current collecting tab and a plurality of negative electrode plates each extending from a negative electrode current collecting tab are alternately laminated via a separator, the positive electrode current collector A positive current collecting terminal to which the tab is joined in an overlapping state, a negative current collecting terminal to which the negative current collecting tab is joined in an overlapping state, and an insulating spacer disposed in the vicinity of the joining portion of both current collecting tabs, It is a laminated electrode body group making jig for producing a laminated electrode body group integrally,
A first recess having substantially the same shape as the spacer disposed at a portion where both current collecting tabs of the laminated electrode body are extended, and substantially the same shape as the positive current collecting terminal and the negative current collecting terminal. Two second recesses are formed, and the portions corresponding to the joint portion between the positive current collector tab and the positive current collector terminal and the joint portion between the negative current collector tab and the negative current collector terminal, respectively. Is a bonding electrode through-hole for forming a bonding apparatus for inserting the bonding apparatus. A method for producing a laminated battery using the laminated electrode body group production jig,
Lamination for producing a plate-shaped laminated electrode body by alternately laminating a plurality of positive electrode plates with a positive current collector tab extended and a plurality of negative electrode plates with a negative electrode current collector tab extended through a separator An electrode body manufacturing step;
A joining device through-hole for inserting the joining device is formed, and the spacer and the laminated electrode body are placed in the first recess, and the positive current collecting terminal and the negative current collecting terminal are placed in the second recessed portion, respectively. Then, the superposed positive electrode current collecting tab and the positive electrode current collecting terminal are joined by inserting a joining device into a through hole for the joining device formed in the laminated electrode body group fabrication jig and the spacer. In addition, a laminated electrode body group production step of producing a laminated electrode body group by joining the negative electrode current collecting tab and the negative electrode current collecting terminal in a superimposed state,
After arranging the laminated electrode body group in the storage recess of the laminate film, a welding step of welding the peripheral edges of the laminate film leaving a part,
A liquid injection step of injecting an electrolytic solution from the opening of the laminate outer body constituted by the laminate film;
A sealing step for sealing the opening of the laminate exterior body while maintaining the reduced pressure state inside the laminate exterior body,
A method for producing a laminated battery using a laminated electrode body group production jig characterized by comprising:

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