JP5618515B2 - Battery - Google Patents

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Publication number
JP5618515B2
JP5618515B2 JP2009220888A JP2009220888A JP5618515B2 JP 5618515 B2 JP5618515 B2 JP 5618515B2 JP 2009220888 A JP2009220888 A JP 2009220888A JP 2009220888 A JP2009220888 A JP 2009220888A JP 5618515 B2 JP5618515 B2 JP 5618515B2
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plate
current collecting
negative electrode
lead
spacer
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JP2011070918A (en
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俊文 志水
俊文 志水
柏▲崎▼ 永記
永記 柏▲崎▼
豊田 夏樹
夏樹 豊田
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株式会社東芝
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/22Fixed connections, i.e. not intended for disconnection
    • H01M2/26Electrode connections
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/34Current conducting connections for cells with provision for preventing undesired use or discharge, e.g. complete cut of current

Description

  The present invention relates to a battery.

  In recent years, with the development of electronic devices, lithium secondary batteries have been developed as non-aqueous electrolyte secondary batteries that are small, lightweight, have high energy density, and can be repeatedly charged and discharged. Recently, non-aqueous electrolyte secondary batteries capable of rapid charging and high output discharge, suitable for in-vehicle secondary batteries mounted on hybrid vehicles and electric vehicles, and secondary batteries for power storage used for power leveling. Development of batteries is desired.

  In order to obtain excellent rapid charge performance and high output discharge performance in a nonaqueous electrolyte secondary battery, it is necessary to efficiently extract current. For this purpose, it is desirable to lead out current collecting tabs from a plurality of locations of the electrodes and to electrically connect these current collecting tabs to external terminals via leads. Since the current collector tab is formed of an electrode current collector, it is required that damage such as cracks does not occur when the battery is subjected to vibration or impact from the outside due to the battery being mounted on an electric vehicle or the like. Is done.

  In Patent Document 1, the lead piece 14 welded to the anode current collector 3 of the power generation element 2 is folded in half and accommodated in a space between the upper end of the power generation element 2 and the sealing body 5, whereby the lead piece 14 Prevents the short circuit from occurring due to contact with the cathode and the inner surface of the outer can 1.

  In the sealed rectangular battery of Patent Document 2, the upper end portion of the thin plate-like current collecting lead 7 led upward from the electrode body 2 is welded to the lower surface of the lead body 17 and bent at a position near the front wall of the container 1. By providing the side walls 25 and 26 of the insulator 11 between the bent current collecting lead 7 and the inner surface of the container 1, a short circuit due to contact between the current collecting lead 7 and the container 1 is prevented.

  Since the lead piece 14 of Patent Literature 1 and the current collecting lead 7 of Patent Literature 2 are all separate parts from the current collector of the electrode, damage caused when vibration or impact is applied to the battery from the outside. Although it can be avoided by changing the lead thickness and material, it is inferior in current collection efficiency.

Japanese Patent Laid-Open No. 7-183023 JP 2006-100097 A

  An object of the present invention is to prevent damage to a current collecting tab when an external force such as vibration or impact is applied to a battery using the current collecting tab formed from the current collector.

The battery of the present invention comprises a container,
An electrode group housed in the container and including a positive electrode and a negative electrode;
A plurality of current collecting tabs extending from a plurality of locations of the current collector of at least one of the positive electrode and the negative electrode of the electrode group, and stacked in the thickness direction;
A lead electrically connected to the current collecting tab;
A lid that closes the opening of the container;
An output terminal provided on the lid and electrically connected to the lead;
A battery comprising a bottom plate disposed on the electrode group, a side plate extending from the bottom plate toward the lid and disposed on the inner surface of the container, and a spacer including a current collecting tab insertion hole opened in the bottom plate. Because
The current collecting tab is accommodated in the spacer through the current collecting tab insertion hole, and extends to the electrode group side by curving into an R shape within the spacer, and then toward the lid side by curving into an R shape. Extending, the tip is electrically connected to the lead,
Wherein R shape, it has a higher radius of curvature 0.2 mm,
The lead is disposed on an inner surface of the lid via an insulating member and electrically connected to the output terminal, and a second extending from the first plate portion to the electrode group side. Plate portion,
The current collecting tab is electrically connected to the second plate portion of the lead;
The first plate portion is disposed in parallel with the lid, and the second plate portion is disposed perpendicular to the lid .

  ADVANTAGE OF THE INVENTION According to this invention, damage to the current collection tab when external force, such as a vibration and an impact, is applied to the battery using the current collection tab formed from the current collector can be prevented.

Sectional drawing which cut | disconnected the battery of 1st Embodiment to the long side direction. The top view which shows the electrode used for the battery of FIG. Sectional drawing which cut | disconnected the electrode of FIG. 2 in the thickness direction. Sectional drawing which cut | disconnected the battery of 1st Embodiment to the short side direction, and was seen from the negative electrode terminal side. Sectional drawing which cut | disconnected the battery of 1st Embodiment to the short side direction, and was seen from the positive electrode terminal side. The expanded sectional view which shows the current collection tab insertion hole vicinity between the 1st, 2nd spacers in FIG. The perspective view which shows the 1st spacer used for the battery of FIG. The perspective view which shows the 2nd spacer used for the battery of FIG. The disassembled perspective view about the principal part of the battery of FIG. The disassembled perspective view about the principal part of the battery of FIG. Sectional drawing which shows the manufacturing process of the battery of FIG. Sectional drawing which shows the manufacturing process of the battery of FIG. Sectional drawing which shows the manufacturing process of the battery of FIG. Sectional drawing which shows the manufacturing process of the battery of FIG. Sectional drawing which cut | disconnected the battery of 2nd Embodiment to the short side direction, and was seen from the negative electrode terminal side. Sectional drawing which cut | disconnected the battery of 3rd Embodiment to the short side direction, and was seen from the negative electrode terminal side. The disassembled perspective view about the principal part of the battery of 3rd Embodiment. The schematic diagram for demonstrating the bending test done in the Example. The schematic diagram for demonstrating the tensile strength test done in the Example. The bar graph which shows the relationship between the thickness of a current collection tab test piece, the frequency | count of a bending test, and tensile strength. The schematic diagram for demonstrating the repeated bending test done in the Example. The graph which shows the relationship between the curvature radius of a bending part, and the frequency | count of a fracture | rupture by a repeated bending test. Sectional drawing which cut | disconnected the square nonaqueous electrolyte battery of Example 6 to the short side direction, and was seen from the negative electrode terminal side. Sectional drawing which cut | disconnected the square nonaqueous electrolyte battery of Example 7 to the short side direction, and was seen from the negative electrode terminal side.

  Hereinafter, a battery according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to these embodiments.

(First embodiment)
The battery shown in FIG. 1 is a sealed square nonaqueous electrolyte secondary battery. This battery includes a container 1, an electrode group 2 housed in the container 1, a nonaqueous electrolyte solution (not shown) housed in the container 1, a lid 3 that closes the opening of the container 1, and a lid 3 The positive electrode terminal 4 and the negative electrode terminal 5 are provided.

The container 1 has a bottomed rectangular tube shape, and is an outer can formed from, for example, a metal such as aluminum, an aluminum alloy, iron, or stainless steel.

  The electrode group 2 includes a sheet-like positive electrode 6, a sheet-like negative electrode 7, and a separator (not shown) disposed between the positive electrode 6 and the negative electrode 7. As shown in FIGS. 2 and 3, the positive electrode 6 includes a strip-shaped current collector 6a and a positive electrode active material layer 6b formed on at least one surface (in the case of FIGS. 2 and 3) of the current collector 6a. And a strip-shaped current collecting tab 6c extending in a short side direction from a plurality of long sides of the current collector 6a. The negative electrode 7 has the same shape as the positive electrode 6, and includes a strip-shaped current collector 7 a and a negative electrode active material layer 7 b formed on at least one surface (in the case of FIGS. 2 and 3) of the current collector 7 a And a current collector tab 7c having a strip shape extending in a short side direction from a plurality of long sides of the current collector 7a.

  The electrode group 2 has a flat shape as shown in FIGS. 9 and 10. For example, the electrode group 2 is wound in a spiral shape with a separator interposed between the positive electrode 6 and the negative electrode 7, and then the whole is pressed into a flat shape. It is produced by molding. From one half of one end face (upper end face) of the electrode group 2, the current collecting tab 6 c of the positive electrode 6 is led upward and the current collecting tab 7 c of the negative electrode 7 is led upward.

  The positive and negative electrode current collecting tabs 6c and 7c are each formed by punching a current collector. The current collector is formed from, for example, a metal foil. The thickness of the metal foil, that is, the thickness per current collecting tab is desirably 10 μm or more and 20 μm or less. By setting the thickness of the metal foil within the above range, it is possible to prevent the current collector and the current collecting tab from being broken during production and to achieve high current collecting efficiency. Although the kind of metal foil can change with the kind of active material used for the positive electrode 6 or the negative electrode 7, aluminum foil, aluminum alloy foil, etc. can be mentioned, for example.

  As shown in FIGS. 9 and 10, the current collecting tab 6c of the positive electrode 6 has a positive electrode protection lead in which at least the tip portion is laminated in the thickness direction and then the overlapped portion is U-shaped or folded in two. 8 is sandwiched. On the other hand, the current collecting tab 7c of the negative electrode 7 is sandwiched by the negative electrode protection lead 9 in which at least the tip portion is laminated in the thickness direction, and then the overlapped portion is U-shaped or folded in two. For the electrical connection between the positive electrode protection lead 8 and the current collecting tab 6c and the electrical connection between the negative electrode protection lead 9 and the current collection tab 7c, methods such as laser welding, ultrasonic bonding, and resistance welding are used. Ultrasonic bonding is preferred. The positive and negative electrode protection leads 8 and 9 are preferably made of the same material as the current collecting tabs 6c and 7c, respectively. Further, it is desirable that the thickness of the positive and negative electrode protective leads 8 and 9 is larger than three times the thickness of the current collecting tabs 6c and 7c. A more preferable range is 0.05 mm or more and 0.6 mm or less, and a further preferable range is 0.1 mm or more and 0.5 mm or less.

  The opening of the container 1 is sealed with a sealing member 10. 9 and 10 are exploded perspective views of the battery of FIG. 1, but for convenience, the container is omitted in FIG. 9 and the spacer is omitted in FIG. As shown in FIG. 9, the sealing member 10 includes a lid 3 that closes the opening of the container 1, a positive electrode terminal 4 protruding in a convex shape on the outer surface side (upper surface side) of the lid 3, and an outer surface (upper surface) of the lid 3. A negative electrode terminal 5 that is caulked and fixed via a gasket 11, a positive electrode lead 12 that is electrically connected to the positive electrode terminal 4, a negative electrode lead 13 that is electrically connected to the negative electrode terminal 5, a positive and negative electrode lead 12, 13 and an insulator 14 disposed between the inner surface (lower surface) of the lid 3.

  The lid 3 has a rectangular plate shape, and is seam welded to the opening of the container 1 by, for example, a laser. The lid 3 is made of a metal such as aluminum, aluminum alloy, iron or stainless steel, for example. The lid 3 and the container 1 are preferably formed from the same type of metal. A rectangular recess 15 for accommodating the gasket 11 is provided on the outer surface of the lid 3. A through hole 16 into which the shaft portion of the negative electrode terminal 5 is inserted is opened in the recess 15. The electrolyte solution injection port 17 is opened in the lid 3 and sealed with a sealing lid 18 as shown in FIG. 1 after the electrolyte solution is injected.

  As shown in FIG. 10, the negative electrode terminal 5 has a rivet shape, and specifically includes a flange portion 5a and a shaft portion 5b extending from the flange portion 5a. The negative electrode terminal 5 is made of, for example, aluminum or an aluminum alloy.

  The gasket 11 is formed from, for example, polypropylene (PP), thermoplastic fluororesin, or the like. Examples of the thermoplastic fluororesin include tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

  As shown in FIG. 10, the insulator 14 includes a rectangular plate 19 and a convex portion 20 formed on one short side of the plate 19. Since the convex portion 20 is fitted to the inner surface of the positive electrode terminal 4, it has a shape similar to that of the positive electrode terminal 4. The plate 19 has a through hole 21 provided so as to communicate with the through hole 16 of the lid 3 and an electrolyte inlet 22 provided so as to communicate with the electrolyte inlet 17 of the lid 3. The insulator 14 can be formed from the same material as described in the gasket 11. In particular, PFA having excellent heat resistance is suitable.

  The positive electrode lead 12 includes a first plate portion 27 made of a rectangular plate provided with a rectangular slit 26 into which the convex portion 20 of the insulator 14 is inserted, and the first plate portion 27 toward the electrode group 2 side. And an extended second plate portion 28. The positive electrode lead 12 is formed of a conductive material, and the material is changed depending on the type of the positive electrode active material. For example, aluminum or aluminum alloy can be used.

  The negative electrode lead 13 includes a first plate portion 24 having a through hole 23 provided so as to communicate with the through hole 21 of the insulator 14, and a first plate portion 24 extending from the first plate portion 24 to the electrode group 2 side. 2 plate portions 25 and having an L-shaped cross-sectional shape. The negative electrode lead 13 is formed of a conductive material, and the material is changed according to the type of the negative electrode active material. When the negative electrode active material is lithium titanate, aluminum or an aluminum alloy can be used.

  A method for electrically connecting the negative electrode terminal 5 and the negative electrode lead 13 will be described below. The flange portion 5a of the negative electrode terminal 5 is accommodated in the gasket 11 fitted in the recess 15 of the lid 3, and the shaft portion 5b is the through hole 11a of the gasket 11, the through hole 16 of the lid 3, and the through hole of the insulator 14. 21 and the through hole 23 of the negative electrode lead 13. Since the shaft portion 5b of the negative electrode terminal 5 is deformed by caulking, the shaft portion 5b is fixed to the through hole 16 of the lid 3 via the gasket 11, and the through hole 21 of the insulator 14 and the negative electrode lead 13 are penetrated. Close contact with the hole 23 without any gap. Thereby, the negative electrode terminal 5 and the lid | cover 3 are fixed in the state by which insulation and airtightness were ensured, and the negative electrode terminal 5 and the negative electrode lead 13 are also fixed in the state by which electrical connection was ensured.

  As shown in FIG. 1, the convex portion 20 of the insulator 14 is fitted to the inner surface of the positive electrode terminal 4 of the lid 3. As shown in FIGS. 1 and 9, in the positive electrode lead 12, the upper surface of the first plate portion 27 is in contact with the inner surface of the lid 3, and the convex portion 20 of the insulator 14 is inserted into the slit 26. Thereby, the positive electrode terminal 4 and the positive electrode lead 12 are fixed in a state in which electrical connection is ensured.

  In the case of a lithium ion secondary battery using a carbon-based material for the negative electrode active material, the material of the positive electrode terminal is generally aluminum or an aluminum alloy, and the material of the negative electrode terminal is copper, nickel, nickel plated. Metal such as iron is used.

  The battery shown in FIG. 1 includes first and second spacers 30 and 31. As shown in FIG. 7, the first spacer 30 includes a rectangular bottom plate 30a, a rectangular side plate 30b provided on the long side of the bottom plate 30a, both short sides of the side plate 30b, and a middle in the long side direction. And a partition plate 30c provided at the point. A recess 30d for fitting the protrusion of the second spacer 31 is provided on the end face of each partition plate 30c.

  As shown in FIG. 8, the second spacer 31 includes a rectangular bottom plate 31a, a rectangular side plate 31b provided on one long side of the bottom plate 31a, both short sides of the side plate 31b, and a long side direction. And a partition plate 31c provided at an intermediate point. On the end face of each partition plate 31c, a protrusion 31d to be inserted into the recess 30d of the first spacer 30 is provided. The other long side of the bottom plate 31a of the second spacer 31 is notched, and is provided with a notch 31e into which the current collecting tabs 6c and 7c are inserted. Holes 32 are formed in the four corners of each of the first spacer 30 and the second spacer 31 in order to allow the electrolyte to penetrate into the space between the container 1 and the electrode group 2. The first spacer 30 and the second spacer 31 are made of a non-conductive material such as PP or PFA, for example.

  As shown in FIGS. 1 and 9, the bottom plate 30 a of the first spacer 30 is disposed on one side of the upper end surface of the electrode group 2 with the positive and negative current collecting tabs 6 c and 7 c interposed therebetween. The side plate 30 b of the first spacer 30 is disposed on the long side inner surface of the container 1, and the partition plates 30 c at both ends are disposed on the short side inner surface of the container 1. The bottom plate 31a of the second spacer 31 is disposed on the other side of the upper end surface of the electrode group 2 with the positive and negative current collecting tabs 6c and 7c interposed therebetween. The side plate 31 b of the second spacer 31 is disposed on the inner surface on the long side of the container 1, and the partition plates 31 c at both ends are disposed on the inner surface on the short side of the container 1. When the protrusion 31d of the partition plate 31c of the second spacer 31 is fitted into the recess 30d of the partition plate 30c of the first spacer 30, the first spacer 30 and the second spacer 31 are integrated. As a result, the inner surface of the container 1 located between the upper end surface of the electrode group 2 and the inner surface of the lid 3 is covered with the first and second spacers 30 and 31 and the upper surface of the electrode group 2 is The bottom plates 30a and 31a of the first and second spacers 30 and 31 are in contact with each other. A gap having a size corresponding to the notch 31e exists between the bottom plate 30a of the first spacer 30 and the bottom plate 31a of the second spacer 31. The gap 31e serves as an insertion hole for the current collecting tabs 6c and 7c. The space surrounded by the first spacer 30 and the second spacer 31 is divided into two by partition plates 30c and 31c located in the center. The negative electrode current collecting tab 7c is accommodated in one space 33 (hereinafter referred to as a first space), and the positive electrode current collecting tab 6c is accommodated in the other space 34 (hereinafter referred to as a second space). Thereby, contact with the positive / negative electrode current collection tabs 6c and 7c and the container 1 is prevented.

  As shown in FIG. 4, the negative electrode current collection tab 7c is accommodated in the first space 33 through the current collection tab insertion hole 31e. The negative electrode current collecting tab 7c is bent so that the portions 35 and 36 having an R shape have a plurality of locations (for example, two locations), and the entire shape is substantially S-shaped. More specifically, the negative electrode current collecting tab 7c is inclined with respect to the direction leading out from the electrode group 2, and is inserted into the current collecting tab insertion hole 31e in this state, and is curved with an R shape 35 having a large curvature radius. Then, one side of the negative electrode protection lead 9 that traverses the first space 33 and curves with an R shape 36 having a small radius of curvature and sandwiches the tip of the negative electrode current collecting tab 7 c is the first side of the negative electrode lead 13. The two plate portions 25 are arranged and electrically connected. A connection surface between the negative electrode protection lead 9 and the second plate portion 25 is indicated by A.

  As shown in FIG. 5, the positive electrode current collecting tab 6c is accommodated in the second space 34 through the current collecting tab insertion hole 31e. The positive electrode current collecting tab 6c is bent so that the portions 37 and 38 having an R shape are formed at a plurality of locations (for example, two locations), and the whole is substantially S-shaped. More specifically, the positive electrode current collecting tab 6c is inclined with respect to the direction from the electrode group 2 and is inserted into the current collecting tab insertion hole 31e in this state, and is curved with an R shape 37 having a large radius of curvature. Then, one side of the positive electrode protection lead 8 that crosses the second space 34 and curves with an R shape 38 having a small radius of curvature and sandwiches the tip of the positive electrode current collecting tab 6 c is the first side of the positive electrode lead 12. Two plate portions 28 are arranged and electrically connected. A connection surface between the positive electrode protection lead 8 and the second plate portion 28 is indicated by B.

  Examples of the electrical connection method between the positive and negative electrode protective leads 8 and 9 and the positive and negative electrode leads 12 and 13 include laser welding, ultrasonic bonding, and resistance welding. Among these, ultrasonic bonding is preferable.

  When the battery is mounted on an automobile, a forklift, or the like, and external vibration or impact is applied to the battery, the electrode group 2 tends to move in the direction of pushing up the positive and negative current collecting tabs 6c and 7c. Although this movement is suppressed by the first and second spacers 30 and 31, the entire upper end surface of the electrode group 2 led out by the positive and negative current collecting tabs 6c and 7c is covered by the first and second spacers 30 and 31. Since it is virtually impossible to hold down, it is inevitable that an external stress (external load) is applied to the positive and negative electrode current collecting tabs 6c and 7c.

  With the structure shown in FIGS. 4 and 5, the negative electrode current collecting tab 7 c is bent with the second plate portion 25 in the first space 33 in a state where the two portions 35 and 36 are bent in an R shape. It arrange | positions in the space part located in the opposite side to the connection surface A with the negative electrode protection lead 9. FIG. Further, the positive electrode current collecting tab 6c is a connection surface B between the second plate portion 28 and the positive electrode protection lead 8 in the second space 34 in a state where the two locations 37 and 38 are bent so as to have an R shape. It is arrange | positioned in the space part located in the other side. As a result, the positive and negative current collecting tabs 6c and 7c can be flexibly deformed like a spring against an external stress in the direction of pushing up the positive and negative current collecting tabs 6c and 7c. It is possible to prevent damage such as cracks and breaks.

  The positive and negative electrode current collecting tabs 6c and 7c have a radius of curvature of a portion bent into an R shape exceeding 0 mm and a difference between the short side width of the container and the thickness of the component, which is equal to or less than the short side width H of the space space. The size is desirable. In the case of FIG. 4, the short side width H of the space space is the distance between the surface opposite to the connection surface A of the negative electrode protection lead 9 and the side plate 31 b of the second spacer 31. The lower limit value of the radius of curvature is more preferably 0.2 mm or more. This is because as the radius of curvature increases, the flexibility of the positive and negative electrode current collecting tabs 6c and 7c with respect to external stress can be improved. 4 and 5, the curvature radii of the R shapes 35 and 37 close to the lead-out portion from the electrode group 2 are larger than those of the R shapes 36 and 38 close to the connection surfaces A and B, but the present invention is not limited to this. Instead, the one closer to the lead-out portion from the electrode group 2 may be made smaller, or the two radii may have the same radius of curvature.

  In FIGS. 4 and 5, two locations on each of the positive and negative electrode current collecting tabs 6c and 7c are bent, but two or more locations may be provided.

  By bending a plurality of locations of the positive and negative current collecting tabs 6c and 7c into an R shape, the degree of freedom of the positive and negative current collecting tabs 6c and 7c is increased. Therefore, when an external stress such as vibration is applied, There is a possibility that the current collecting tabs 6 c, 7 c sway and come into contact with the inner surface of the container 1. The first and second spacers 30 and 31 can prevent contact between the positive and negative current collecting tabs 6 c and 7 c and the container 1. In addition, the bottom plates 30a and 31a of the first and second spacers 30 and 31 not only restrict the movement of the electrode group 2, but also support the positive and negative current collecting tabs 6c and 7c and maintain the R shape. Yes. Therefore, it is desirable that the bottom plates 30a and 31a of the first and second spacers 30 and 31 have an R shape or a tapered shape at the corners that may come into contact with the positive and negative current collecting tabs 6c and 7c. . Thereby, the effect which prevents the damage to positive / negative electrode current collection tab 6c, 7c can be heightened. One embodiment is shown in FIG. FIG. 6 is an enlarged view of the vicinity of the current collecting tab insertion hole 31 e provided between the bottom plates 30 a and 31 a of the first and second spacers 30 and 31. The corner portion 39 on the end face of the bottom plate 30a of the first spacer 30 and the corner portion 40 on the end face of the bottom plate 31a of the second spacer 31 are formed in an R shape, thereby positively inserted into the current collecting tab insertion hole 31e. When the negative electrode current collecting tabs 6c and 7c come into contact with the end surfaces of the bottom plates 30a and 31a, the positive and negative electrode current collecting tabs 6c and 7c are prevented from being damaged such as cracks and breaks.

  Although the bending method of the positive / negative electrode current collection tabs 6c and 7c is not specifically limited, an example is demonstrated with reference to FIGS. FIGS. 11-14 is sectional drawing which shows the process of the bending process of the negative electrode current collection tab 7c.

  First, the sealing member 10 shown in FIG. 10 is assembled. Next, as shown in FIG. 11, the negative electrode protection lead 9 holding the tip of the negative electrode current collecting tab 7c is laminated on the second plate portion 25 of the negative electrode lead 13 of the sealing member 10, and these are laminated by, for example, ultrasonic bonding. Connect electrically. A connection surface is indicated by A. Although not shown here, the positive electrode lead 12 of the sealing member 10 is also electrically connected to the positive electrode 6 of the electrode group 2. That is, the positive electrode protection lead 8 sandwiching the tip of the positive electrode current collecting tab 6c is laminated on the second plate portion 28 of the positive electrode lead 12, and these are electrically connected by, for example, ultrasonic bonding.

  Next, as shown in FIG. 12, the first molded rod 40 having a columnar shape is applied to the outermost layer on the connection surface A side of the negative electrode current collecting tab 7c, and is deformed into an R shape. At this time, the second molding rod 41 having a diameter smaller than that of the first molding rod 40 is applied to the outermost layer on the opposite side of the negative electrode current collecting tab 7c, and is deformed into an R shape.

  Subsequently, as shown in FIG. 13, the first spacer 30 and the second spacer 31 are arranged on the upper end surface of the electrode group 2, and the side plates 30b and 31b of the first and second spacers 30 and 31 are connected to the electrode group. 2 is fixed with an insulating tape 42. The negative electrode current collection tab 7c is passed through the current collection tab insertion holes 31e of the first and second spacers 30 and 31. The current collecting tab insertion hole 31e is located obliquely above the portion from which the negative electrode current collecting tab 7c is led out. For this reason, the negative electrode current collecting tab 7c passes through the current collecting tab insertion hole 31e in a state of being tilted to the electrode group side, and is surrounded by the first and second spacers 30 and 31 in a state of being bent in a substantially S shape. Placed in the space.

  Next, as shown in FIG. 14, after the electrode group 2 to which the first and second spacers 30 and 31 are fixed is inserted into the container 1, the lid 3 is put on the opening of the container 1, and the lid 3 is placed on the container 1. 4 to obtain the battery shown in FIG. In FIG. 4, the insulating tape 42 is omitted for convenience.

  In FIG. 1, a flat spiral electrode group is used, but the structure of the electrode group is not particularly limited. For example, a stacked electrode group in which a positive electrode and a negative electrode are alternately stacked with a separator interposed therebetween is used. Is possible.

(Second Embodiment)
The battery according to the second embodiment has the same configuration as that of the battery according to the first embodiment, except that the positional relationship between the positive and negative current collecting tabs 6c and 7c and the current collecting tab insertion hole 31e is different. FIG. 15 is a cross-sectional view of the rectangular nonaqueous electrolyte battery according to the second embodiment, cut in the short side direction and viewed from the negative electrode terminal side. The same members as those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted.

  The first spacer 30 has the same configuration as shown in FIG. 7 except that the width in the short side direction of the bottom plate 30a is widened. Further, except that the bottom plate 31a is not provided as the second spacer 31, the one having the same configuration as shown in FIG. 8 is used. When the protrusion 31d of the second spacer 31 is inserted into the recess 30d of the first spacer 30 and fitted together, the gap between the end surface of the bottom plate 30a of the first spacer 30 and the inner surface of the side plate 31b of the second spacer 31 In addition, a current collecting tab insertion hole 31e is formed.

  The positive and negative electrode current collecting tabs 6 c and 7 c are led upward from a position located immediately below the current collecting tab insertion hole 31 e on the upper end surface of the electrode group 2. For this reason, the negative electrode current collecting tab 7c extends upward and passes through the current collecting tab insertion hole 31e, curves with a large curvature radius, crosses the space 33, and is bent with a small curvature radius. Is fixed to the second plate 25 of the negative electrode lead 13 while maintaining electrical connection. On the other hand, although not shown here, the positive electrode current collecting tab 6c has the same structure as that of the negative electrode. That is, the positive electrode current collecting tab 6c extends upward, passes through the current collecting tab insertion hole 31e, curves with a large curvature radius, crosses the space, is bent with a small curvature radius, and one side of the positive electrode protection lead 8 is positive. The lead 12 is fixed to the second plate 28 in an electrically connected state.

  With the structure shown in FIG. 15, the negative electrode current collecting tab 7 c is bent between the second plate portion 25 and the negative electrode protection lead 9 in the first space 33 in a state where two portions are bent in an R shape. It arrange | positions in the space part located on the opposite side to the connection surface A. FIG. Further, the positive electrode current collecting tab 6c is a space located on the opposite side of the connection surface between the second plate portion and the positive electrode protection lead in the second space in a state where two portions are bent in an R shape. Placed in the section. As a result, the positive and negative current collecting tabs 6c and 7c can be flexibly deformed like a spring against an external stress in the direction of pushing up the positive and negative current collecting tabs 6c and 7c. It is possible to prevent damage such as cracks and breaks.

  In the second embodiment, the second spacer 31 does not have a bottom plate, and the lead-out portions of the positive and negative current collecting tabs 6c and 7c are located immediately below the current collecting tab insertion hole 31e. On the other hand, in the first embodiment, since both the first and second spacers 30 and 31 have bottom plates, the electrode group when an external force is applied to push up the positive and negative current collecting tabs 6c and 7c. The effect of regulating the movement of 2 is high. Further, since the positive and negative current collecting tabs 6c and 7c are inclined and pass through the current collecting tab insertion hole 31e and bent into a substantially S shape, the degree of freedom of deformation with respect to the external force is compared with that of the second embodiment. And big. Therefore, 1st Embodiment is excellent in the effect which prevents damage to the current collection tab when external force, such as a vibration and an impact, is added to a battery.

(Third embodiment)
The battery according to the third embodiment has the same configuration as that of the battery according to the first embodiment except that the shape and arrangement of the positive and negative electrode current collecting tabs 6c and 7c are different. FIG. 16 is a cross-sectional view of the prismatic nonaqueous electrolyte battery according to the third embodiment, cut in the short side direction and viewed from the negative electrode terminal side. The same members as those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted.

  The shaft portion 5 b of the negative electrode terminal 5 is fixed by caulking to the through hole 16 of the lid 3 via the gasket 11, and also fixed to the through hole 21 of the plate 19 of the insulator 14. The negative electrode lead 43 is made of a rectangular conductive plate. The negative electrode lead 43 is fixed to the lower surface of the shaft portion 5b of the negative electrode terminal 5 by welding, for example.

  The negative electrode current collecting tab 7c is inclined toward the electrode group side, passes through the current collecting tab insertion hole 31e, and extends upward as it is, curves with a large curvature radius, extends substantially parallel to the negative electrode lead 43, and has a small curvature. A negative electrode protection lead 9 that is curved with a radius and holds the tip of the negative electrode current collecting tab 7 c is fixed to the negative electrode lead 43 in an electrically connected state.

  On the other hand, although not shown here, a positive electrode in which the second plate portion 28 is not provided is used as the positive electrode lead 12. The positive electrode current collecting tab 6c passes through the current collecting tab insertion hole 31e in a state inclined to the electrode group side, and extends upward as it is, curves with a large radius of curvature, extends substantially parallel to the positive electrode lead 12, and has a small curvature. The positive electrode protection lead 8 that is curved with a radius and sandwiches the tip of the positive electrode current collecting tab 6 c is fixed to the first plate portion 27 of the positive electrode lead 12 in an electrically connected state.

  When the structure shown in FIG. 16 is used, the negative electrode current collecting tab 7c is connected to the negative electrode lead 43 and the negative electrode protection lead 9 in the first space 33 in a state where two portions are bent in an R shape. It is arrange | positioned in the space part located in the other side. Further, the positive electrode current collecting tab 6c is a space portion located on the opposite side of the connection surface between the positive electrode lead 12 and the positive electrode protection lead 8 in the second space in a state where two portions are bent in an R shape. Placed in. As a result, the positive and negative current collecting tabs 6c and 7c can be flexibly deformed like a spring against an external stress in the direction of pushing up the positive and negative current collecting tabs 6c and 7c. It is possible to prevent damage such as cracks and breaks.

  In the first to third embodiments, the negative electrode terminal is fixed to the lid by caulking and the positive electrode lead is directly attached to the lid by welding, but the positive electrode external terminal is fixed to the lid by caulking. The negative electrode lead may be structured to be directly attached to the lid by welding. It is also possible to adopt a structure in which the external terminals of both the positive electrode and the negative electrode are fixed to the lid by caulking. An example of this is shown in FIG. In addition, the same member as having demonstrated in FIG. 1 attaches | subjects a same sign, and abbreviate | omits description. In FIG. 17, the spacer is omitted for convenience of explanation.

  As shown in FIG. 17, two rectangular recesses 15 are provided on the outer surface of the lid 3, the positive electrode terminal 50 is accommodated in one recess 15, and the negative electrode terminal 5 is accommodated in the other recess 15. . Each recess 15 is provided with a through hole 16.

  The positive electrode lead 51 has a rectangular plate shape having a through hole 51 a as an attachment hole of the shaft portion of the positive electrode terminal 50. The negative electrode lead 52 has a rectangular plate shape having a through hole 52 a as an attachment hole of the shaft portion of the negative electrode terminal 5. The positive electrode lead 51 and the negative electrode lead 52 are located in the container 1. A positive electrode protection lead 8 holding the tip of the positive electrode current collecting tab 6c is fixed to the positive electrode lead 51 in a state where electrical connection is maintained. On the other hand, to the negative electrode lead 52, the negative electrode protection lead 9 holding the tip of the negative electrode current collecting tab 7c is fixed in a state in which electrical connection is maintained. The positive and negative electrode current collecting tabs 6c and 7c are arranged in a space located on the opposite side of the connection surface between the positive and negative electrode leads 51 and 52 and the positive and negative electrode protection leads 8 and 9 with a plurality of portions bent into an R shape. Is done.

  The positive inner insulator 53 has a rectangular plate shape having a through hole 53 a communicating with the through hole 16 of the lid 3 and the through hole 51 a of the positive electrode lead 51. The positive inner insulator 53 is disposed between the inner surface of the lid 3 and the positive electrode lead 51 to insulate the lid 3 and the positive electrode lead 51.

  The negative electrode inner insulator 54 has a rectangular plate shape having a through hole 54 a communicating with the through hole 16 of the lid 3 and the through hole 52 a of the negative electrode lead 52, and a through hole 54 b communicating with the liquid injection port 17 of the lid 3. Eggplant. The negative inner insulator 54 is disposed between the inner surface of the lid 3 and the negative electrode lead 52 to insulate the lid 3 from the negative electrode lead 52.

  The shaft portion 5b of the negative electrode terminal 5 is inserted into the through hole 16 of the lid 3 via the gasket 11, and is also inserted into the through hole 54a of the internal insulator 54 and the through hole 52a of the negative electrode lead 52, and is caulked and fixed thereto. ing. On the other hand, the positive electrode terminal 50 has a rivet shape, and specifically includes a flange portion 50a and a shaft portion 50b extending from the flange portion 50a. The shaft portion 50b of the positive electrode terminal 50 is inserted into the through hole 16 of the lid 3 via the gasket 11, and is also inserted into the through hole 53a of the internal insulator 53 and the through hole 51a of the positive electrode lead 51, and is caulked and fixed thereto. ing. As a result, the positive and negative terminals 5 and 50 and the lid 3 are fixed in a state in which insulation and airtightness are ensured, and the positive electrode terminal 50 and the positive electrode lead 51 are fixed in a state in which electrical connection is ensured. . The negative electrode terminal 5 and the negative electrode lead 52 are also fixed in a state where electrical connection is ensured.

  Hereinafter, the positive electrode, the negative electrode, the separator, and the electrolytic solution used in the first to third embodiments will be described.

  The positive electrode is produced, for example, by applying a slurry containing a positive electrode active material to a current collector made of an aluminum foil or an aluminum alloy foil. Although it does not specifically limit as a positive electrode active material, The oxide, sulfide, polymer, etc. which can occlude / release lithium can be used. Preferable active materials include lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium iron phosphate, and the like that can obtain a high positive electrode potential. The negative electrode is produced by applying a slurry containing a negative electrode active material to a current collector made of an aluminum foil or an aluminum alloy foil. The negative electrode active material is not particularly limited, and metal oxides, metal sulfides, metal nitrides, alloys, and the like that can occlude and release lithium can be used. Preferably, the lithium ion occlusion and release potential is metal lithium. It is a substance that becomes noble 0.4V or more with respect to the potential. Since the negative electrode active material having such a lithium ion storage / release potential can suppress the alloy reaction between aluminum or an aluminum alloy and lithium, it is possible to use aluminum or an aluminum alloy for a negative electrode current collector and a negative electrode related component. And For example, there are titanium oxide, lithium titanium oxide, tungsten oxide, amorphous tin oxide, tin silicon oxide, silicon oxide, etc. Among them, lithium titanium composite oxide is preferable. As the separator, a microporous film, a woven fabric, a non-woven fabric, a laminate of the same material or different materials among these can be used. Examples of the material for forming the separator include polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-butene copolymer.

As the electrolytic solution, a nonaqueous electrolytic solution prepared by dissolving an electrolyte (for example, lithium salt) in a nonaqueous solvent is used. Examples of the non-aqueous solvent include ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), γ-butyrolactone (γ -BL), sulfolane, acetonitrile, 1,2-dimethoxyethane, 1,3-dimethoxypropane, dimethyl ether, tetrahydrofuran (THF), 2-methyltetrahydrofuran and the like. Nonaqueous solvents may be used alone or in combination of two or more. Examples of the electrolyte include lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium arsenic hexafluoride (LiAsF 6 ), and trifluorometa. A lithium salt such as lithium sulfonate (LiCF 3 SO 3 ) can be given. The electrolyte may be used alone or in combination of two or more. The amount of electrolyte dissolved in the non-aqueous solvent is desirably 0.2 mol / L to 3 mol / L.

  Hereinafter, embodiments of the present invention will be described in detail.

(Example 1 to Example 4)
The thickness and the number of the positive and negative electrode current collecting tabs were changed as shown in Table 1 below, and the prismatic nonaqueous electrolyte secondary battery of the first embodiment having the structure shown in FIG. 1 was manufactured.

(Example 5)
The thickness and the number of positive and negative current collecting tabs were changed as shown in Table 1 below, and a square nonaqueous electrolyte secondary battery of the third embodiment having the structure shown in FIG. 16 was manufactured.

(Example 6)
As shown in FIG. 23, the negative electrode current collecting tab 7 c is pulled out as it is from the upper end surface of the electrode group 2, stacked in the thickness direction, the tip is sandwiched between the negative electrode protection leads 9, and these are connected to the second of the negative electrode leads 13. The plate part was ultrasonically bonded. Although not shown here, the positive current collecting tab is also drawn out from the upper end surface of the electrode group as it is, stacked in the thickness direction, and the tip is sandwiched between positive protective leads, and these are connected to the positive lead. The second plate part was ultrasonically bonded. Table 1 below shows the thickness and the number of positive and negative current collecting tabs.

  As the first and second spacers 55 and 56, those having no bottom plate were used.

  A square nonaqueous electrolyte secondary battery having the same configuration as in Example 1 was manufactured except for the above configuration.

(Example 7)
As shown in FIG. 24, the negative electrode current collecting tab 7c that has passed through the current collecting tab insertion hole 31e is folded back into a V shape, and then folded back into an R shape, and the tip portion sandwiched between the negative electrode protection leads 9 is connected to the negative electrode lead. Thirteen second plate portions 25 were ultrasonically bonded. Although not shown here, the positive electrode current collecting tab is also folded back into a V shape and then folded back into an R shape, and the tip portion sandwiched between the positive electrode protection leads is ultrasonically applied to the second plate portion of the positive electrode lead. Joined. Table 1 below shows the thickness and the number of positive and negative current collecting tabs. Further, the radius of curvature of the V-shaped folded portion was 0 mm.

  A square nonaqueous electrolyte secondary battery having the same configuration as in Example 1 was manufactured except for the above configuration.

The batteries of Examples 1 to 6 were subjected to the drop test described in JIS. A natural drop from 1 mm onto the wood was performed once for each of the six directions of the battery. After the test was completed, the battery was disassembled and it was confirmed whether or not the current collecting tab was broken. The results are shown in Table 1 below. In addition, the parameter of the battery which tested was 10 pieces for each kind.

  In Examples 1 to 5, the occurrence of tab breakage was smaller than in Examples 6 and 7. In Examples 1 to 4, occurrence of tab breakage was not confirmed. By comparing the results of Examples 1 to 3, it was confirmed that the effects of the present invention were obtained regardless of the thickness of the current collecting tab. Further, by comparing the results of Example 2 and Example 4, it was confirmed that the effects of the present invention can be obtained without affecting the number of current collecting tabs.

  In Example 5, the current collecting tab is pushed up to the upper side (metal lid side) due to the elastic force of the current collecting tab. For this reason, the upper folded portion appears to have an R shape, but the inner side is in a folded state, and tab breakage has occurred at the fold starting point. There was one such tab cut out of ten.

  In Example 6, the current collector tab was cut off because the current collector tab was pulled due to a drop impact. Since the spacers 55 and 56 used in Example 6 do not have a function of fixing the electrode group 2, the electrode group 2 moves in the battery (inside the container), loads the current collecting tab, and disconnects the current collecting tab. Or a defect such as breakage occurred.

  In Example 7, tab breakage occurred starting from the V-shaped bent portion.

  From this result, it is necessary that the radius of curvature of the R-shaped bent portion is greater than 0 mm and not more than the short side width of the space space, which is the difference between the short side width of the container and the component thickness. found.

  Further, regarding the strength of the bent portion, the strength reduction of the current collecting tab having no R shape and the superiority of the R shape were confirmed with a 15 mm wide test specimen.

<Check tensile strength>
A current collecting tab test piece 60 made of an aluminum foil having a width W of 15 mm, a length L of 30 mm, and a thickness of 10, 15, and 20 μm was prepared. About each test piece 60, as shown in FIG. 18, it bent 180 degrees. Then, as shown in FIG. 19, one side of each test piece 60 was fixed, and the opposite side was pulled in the direction of the arrow until the test piece 60 was cut, and the strength was confirmed. The result is shown in FIG. FIG. 20 shows the tensile strength measured by increasing the number of 180 ° foldings to two and the tensile strength measured without performing 180 ° folding.

  From the results of FIG. 20, it was confirmed that the tensile strength when the 180 ° bending was performed twice was reduced by 80% or more compared to the tensile strength measured without performing the 180 ° bending. From this, it has been confirmed that bending into a shape having no radius of curvature leads to a decrease in strength of the current collecting tab.

<Repeated bending confirmation>
A test piece 61 of a current collecting tab made of an aluminum foil having a width of 15 mm, a length of 30 mm, and a thickness of 15 μm was prepared.

  As shown in FIG. 21, a test piece 61 was sandwiched between a support base 62 and a plate member 63 having an R shape, and the test piece 61 was repeatedly bent to confirm the number of times that breakage occurred. The test was performed by changing the radius of curvature of the R shape of the plate material 63 to 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, and 2 mm. The result is shown in FIG.

  From the result of FIG. 22, it can be seen that the strength reduction of the current collecting tab is suppressed by making the bent portion into an R shape. Moreover, it turns out that the frequency | count until a fracture | rupture becomes large and the intensity | strength of a current collection tab is improved, so that the curvature radius of R shape is large.

  As described above, according to the present invention, it is possible to provide a good secondary battery that does not cause a current collecting tab to be cut off due to impact or the like.

Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
Hereinafter, the invention described in the scope of the claims of the present application will be appended.
[1] a container;
An electrode group housed in the container and including a positive electrode and a negative electrode;
A plurality of current collecting tabs extending from a plurality of locations of the current collector of at least one of the positive electrode and the negative electrode of the electrode group, and stacked in the thickness direction;
A lead electrically connected to the current collecting tab;
A lid that closes the opening of the container;
A battery comprising an output terminal provided on the lid and electrically connected to the lead,
The battery, wherein the current collecting tab is housed in a space located on the opposite side of the connection surface between the current collecting tab and the lead in a state where a plurality of points are bent into an R shape.
[2]
[1] The battery according to [1], further comprising a spacer interposed between the electrode group and the lid.
[3]
The spacer includes a bottom plate disposed on the electrode group, a side plate extending from the bottom plate to the lid side and disposed on the inner surface of the container, and a current collecting tab insertion hole opened in the bottom plate. ,
The battery according to [2], wherein the current collecting tab is accommodated in the space in the spacer through the current collecting tab insertion hole.
[4]
The battery according to any one of [2] to [3], wherein the spacer is a non-conductor.
[5]
The battery according to any one of [1] to [4], wherein the current collecting tab has a thickness of 10 μm or more and 20 μm or less per sheet.
[6]
The lead is disposed on an inner surface of the lid via an insulating member and electrically connected to the output terminal, and a second extending from the first plate portion to the electrode group side. Plate portion,
[1] to [5], wherein the current collecting tab is electrically connected to the second plate portion of the lead and is accommodated in a space located on the opposite side of the connecting surface. A battery according to any one of the above.

  DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Electrode group, 3 ... Cover, 4 ... Positive electrode terminal, 5 ... Negative electrode terminal, 6 ... Positive electrode, 6a ... Positive electrode collector, 6b ... Positive electrode active material layer, 6c ... Positive electrode current collection tab, 7 ... Negative electrode, 7a ... Negative electrode current collector, 7b ... Negative electrode active material layer, 7c ... Negative electrode current collecting tab, 8 ... Positive electrode protection lead, 9 ... Negative electrode protection lead, 10 ... Sealing member, 12 ... Positive electrode lead, 13 ... Negative electrode lead, DESCRIPTION OF SYMBOLS 14 ... Insulator, 30, 31 ... 1st, 2nd spacer, 31e ... Current collection tab insertion hole, 33 ... 1st space, 34 ... 2nd space, A, B ... Connection surface.

Claims (5)

  1. A container,
    An electrode group housed in the container and including a positive electrode and a negative electrode;
    A plurality of current collecting tabs extending from a plurality of locations of the current collector of at least one of the positive electrode and the negative electrode of the electrode group, and stacked in the thickness direction;
    A lead electrically connected to the current collecting tab;
    A lid that closes the opening of the container;
    An output terminal provided on the lid and electrically connected to the lead;
    A battery comprising a bottom plate disposed on the electrode group, a side plate extending from the bottom plate toward the lid and disposed on the inner surface of the container, and a spacer including a current collecting tab insertion hole opened in the bottom plate. Because
    The current collecting tab is accommodated in the spacer through the current collecting tab insertion hole, and extends to the electrode group side by curving into an R shape within the spacer, and then toward the lid side by curving into an R shape. Extending, the tip is electrically connected to the lead,
    Wherein R shape, it has a higher radius of curvature 0.2 mm,
    The lead is disposed on an inner surface of the lid via an insulating member and electrically connected to the output terminal, and a second extending from the first plate portion to the electrode group side. Plate portion,
    The current collecting tab is electrically connected to the second plate portion of the lead;
    The battery, wherein the first plate portion is disposed in parallel with the lid, and the second plate portion is disposed perpendicular to the lid .
  2.   The spacer includes a first spacer including a rectangular bottom plate and a rectangular side plate provided on a long side of the bottom plate, a rectangular bottom plate, and a rectangular side plate provided on a long side of the bottom plate. The battery according to claim 1, wherein a second spacer provided on the bottom plate and including a notch portion as the current collecting tab insertion hole is integrated.
  3.   The spacer includes a first spacer including a rectangular bottom plate, a rectangular side plate provided on a long side of the bottom plate, and a second spacer including a rectangular side plate. 2. The battery according to claim 1, wherein the battery is integrated so that a gap between an end surface of the bottom plate and an inner surface of the side plate of the second spacer becomes the current collecting tab insertion hole.
  4.   The battery according to claim 1, wherein the spacer is a non-conductor.
  5.   5. The battery according to claim 1, wherein the current collecting tab has a thickness of 10 μm or more and 20 μm or less per sheet.
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JP6173730B2 (en) * 2013-03-14 2017-08-02 株式会社東芝 battery
JP6173729B2 (en) 2013-03-14 2017-08-02 株式会社東芝 Battery manufacturing method
JP6305065B2 (en) * 2014-01-06 2018-04-04 株式会社東芝 battery
JP2015204248A (en) * 2014-04-16 2015-11-16 住友電気工業株式会社 Electric insulation sheet for square battery, square battery and manufacturing method of square battery
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US10439195B2 (en) * 2015-03-13 2019-10-08 Kabushiki Kaisha Toyota Jidoshokki Power storage device
JP6701210B2 (en) * 2015-09-18 2020-05-27 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh Electric storage element and method for manufacturing electric storage element
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