JP2018185889A - Sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed battery in which a collector terminal can be satisfactorily welded to an electrode body and influences to be exerted upon the electrode body or the like in the case of welding are suppressed.SOLUTION: The present invention relates to a sealed battery comprising: an electrode body 5 including a first end face 24 and a second end face 25 that are arrayed in a width direction, and an electrode formed on the first end face; and a collector terminal 6 welded to the electrode body while including a pedestal part 40 disposed on a top face of the electrode body and multiple legs 41 connected to the pedestal part, disposed on the first end face and welded to the electrode. The pedestal part includes: a first side face and a second side face that are arrayed in a thickness direction of the electrode body; and a connection face 44 connecting an end of the first side face closer to the second end face with an end of the second side face closer to the second end face. Each of the multiple legs includes: multiple first legs that are formed while being spaced from each other; and a second leg that is disposed between the first legs. A connection portion of the second leg with the pedestal part is positioned closer to the connection face than a connection portion of the first leg with the pedestal part. The second leg is disposed between the multiple first legs while passing from the connection portion with the pedestal part to a surface of the pedestal part.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a sealed battery.

  Conventionally, various types of sealed batteries have been proposed. For example, a sealed battery described in Japanese Patent Application Laid-Open No. 10-10653 includes an electrode body, a housing case, a positive current collector terminal, and a negative current collector terminal. At both ends of the electrode body, an uncoated portion of the positive electrode and an uncoated portion of the negative electrode are formed. The positive current collector terminal is welded to the uncoated portion of the positive electrode, and the negative current collector terminal is welded to the uncoated portion of the negative electrode.

  Further, in recent years, various proposals have been made for the configuration of the current collecting terminal in order to favorably weld the current collecting terminal to the uncoated portion.

  For example, Japanese Patent Laid-Open No. 2007-299536 proposes a current collector terminal in which a plurality of slits are formed and a sealed battery that is welded to the current collector terminal while being inserted into the slit.

Japanese Patent Laid-Open No. 10-10653 JP 2007-299536 A

  When manufacturing a sealed battery described in Japanese Patent Application Laid-Open No. 2007-299536, it is necessary to insert uncoated portions of the current collector foil into the slits of the current collector terminals in a bundled state.

  At this time, when the width of the slit is narrow, the uncoated portion of the current collector foil cannot be satisfactorily inserted into the slit. In order to make it easier to insert the bundled uncoated portions into the slit, it is conceivable to increase the width of the slit.

  However, if laser welding of the uncoated portion and the current collecting terminal is attempted with a wide slit width, the laser may come out from the gap between the slit and the uncoated portion, which may affect the electrode body. In addition, when laser welding is performed, metal pieces such as uncoated parts may scatter, or melted parts of uncoated parts and current collector terminals may scatter, and the metal pieces and molten parts may escape from the slit to the electrode body side. There is.

  The present disclosure has been made in view of the problems as described above, and the purpose thereof is to satisfactorily weld the current collector terminal to the electrode body, and to influence the electrode body and the like during welding. It is to provide a sealed battery that is suppressed.

  The sealed battery includes an electrode body and a current collecting terminal welded to the electrode body. The electrode body includes a first end surface and a second end surface arranged in the width direction of the electrode body, and an electrode formed on the first end surface. The current collecting terminal includes a pedestal portion disposed on the upper surface of the electrode body, and a plurality of legs connected to the pedestal portion and disposed on the first end surface and welded to the electrode. The pedestal portion connects the first side surface and the second side surface arranged in the thickness direction of the electrode body, the end portion on the second end surface side of the first side surface, and the end portion on the second end surface side of the second side surface. Connection surface. The plurality of legs include a plurality of first legs formed at intervals and a second leg disposed between the first legs. The connecting portion of the second leg portion with the pedestal portion is located closer to the connection surface than the connecting portion of the first leg portion with the pedestal portion, and the second leg portion is connected to the pedestal portion from the connecting portion with the pedestal portion. It passes over the part and is disposed between the plurality of first legs.

  According to the sealed battery according to the present disclosure, the current collecting terminal can be favorably welded to the electrode body, and the influence on the electrode body and the like during welding can be suppressed.

1 is a cross-sectional view showing a sealed battery 1. FIG. 2 is a perspective view showing an electrode body 5 and a positive electrode current collecting terminal 6. FIG. 3 is a plan view showing a positive electrode current collecting terminal 6 and an electrode body 5. FIG. 3 is a plan view showing a positive electrode current collecting terminal 6. FIG. 3 is a perspective view showing a positive electrode current collecting terminal 6. FIG. It is a top view which shows the positive electrode current collection terminal 6 in the state which abbreviate | omitted most of long leg parts 41A and 41B. It is a perspective view which shows the positive electrode current collection terminal 6 in the state which abbreviate | omitted most of long leg parts 41A and 41B. It is a top view in the state where short leg parts 41C, 41D, and 41E were omitted from positive electrode current collection terminal 6. It is a perspective view in the state where short leg parts 41C, 41D, and 41E were omitted from positive electrode current collection terminal 6. 3 is a side view showing a positive electrode current collecting terminal 6 and an electrode body 5. FIG. It is sectional drawing which shows typically the base part 40 and the surrounding structure. 2 is a flowchart showing a manufacturing process for manufacturing the sealed battery 1. FIG. It is a flowchart which shows the manufacturing process which manufactures the positive electrode current collection terminal. It is a top view which shows metal plate preparation process S10 typically. It is a top view which shows punching process S11 typically. It is a front view which shows 1st bending process S12 typically. It is a front view which shows 2nd bending process S13 typically. It is a process flow figure showing a process of manufacturing an electrode body. 3 is a plan view showing a positive electrode sheet 26. FIG. 3 is a plan view showing a negative electrode sheet 28. FIG. It is a perspective view which shows lamination process S21 typically. It is a perspective view which shows foil deformation process S22 typically. It is sectional drawing which shows typically a mode that the front-end | tip part of the non-application part 33 is deformed. It is a schematic diagram which shows the front-end | tip part of the uncoated part 33 which deform | transformed. It is a perspective view which shows lamination process S23 typically. It is a process flow figure showing terminal assembly process S3. It is a perspective view which shows slit insertion process S30 typically. It is a front view which shows the groove part 126, the leg part 41, etc. FIG. It is sectional drawing which shows a part of positive electrode current collection terminal 6 after slit insertion process S30. It is a perspective view which shows the positive electrode current collection terminal 6 in terminal pressurization process S31. It is sectional drawing which shows the positive electrode current collection terminal 6 in terminal pressurization process S31. It is a perspective view which shows typically the positive electrode current collection terminal 6 in terminal pressurization process S31. It is a perspective view which shows a mode that the positive electrode current collection terminal 6 and the bundle | flux 105 are welded. It is sectional drawing which shows a mode that the positive electrode current collection terminal 6 and the bundle | flux 105 are welded. It is a schematic diagram which shows accommodation process S5 typically. It is a perspective view which shows a part of sealed battery 1A which concerns on a comparative example. It is a perspective view which shows terminal pressurization process S31 of 1 A of sealed batteries. It is sectional drawing which shows terminal pressurization process S31 of 1 A of sealed batteries. It is sectional drawing which shows welding process S32 typically.

  The power storage device according to the present embodiment will be described with reference to FIGS. Among the configurations shown in FIGS. 1 to 39, the same or substantially the same configurations are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a cross-sectional view showing a sealed battery 1. The sealed battery 1 includes a housing case 2, a positive electrode external terminal 3, a negative electrode external terminal 4, an electrode body 5, a positive electrode current collector terminal 6, a negative electrode current collector terminal 7, and blocking mechanisms 8 and 9. .

  An electrolytic solution 10 is injected into the housing case 2. The housing case 2 includes a case body 11 and a lid 12. The case body 11 has an opening that opens upward. The lid 12 is disposed so as to close the opening of the case body 11, and the lid 12 is welded to the case body 11. The lid 12 is formed with an inlet 13 a, and the inlet 13 a is closed by the sealing member 13.

The positive external terminal 3 and the negative external terminal 4 are disposed on the upper surface of the lid 12.
The electrode body 5 includes a positive electrode 30 formed on the end surface 24 and a negative electrode 31 formed on the end surface 25.

  The negative electrode current collecting terminal 7 includes a pedestal portion 35 and a plurality of leg portions 36. The negative electrode current collector terminal 7 is made of, for example, copper or a copper alloy.

  The pedestal portion 35 is disposed on the upper surface of the electrode body 5. The plurality of leg portions 36 are connected to the pedestal portion 35 and are disposed on the end face 25 of the electrode body 5. Each leg portion 36 is welded to the negative electrode 31 by a welding portion 37. The blocking mechanism 9 is arranged on the pedestal portion 35 of the negative electrode current collecting terminal 7.

  The positive electrode current collecting terminal 6 includes a pedestal portion 40 disposed on the upper surface of the electrode body 5 and a plurality of leg portions 41 connected to the pedestal portion 40. The blocking mechanism 8 is disposed on the pedestal portion 40. The blocking mechanism 8 is formed in the same manner as the blocking mechanism 9.

  FIG. 2 is a perspective view showing the electrode body 5 and the positive electrode current collecting terminal 6. The electrode body 5 is formed in a substantially rectangular parallelepiped shape. The electrode body 5 includes an upper surface 20, a lower surface 21, main side surfaces 22 and 23, and end surfaces 24 and 25. The upper surface 20 and the lower surface 21 are arranged in the height direction H of the electrode body 5. The main side surface 22 and the main side surface 23 are arranged in the thickness direction T of the electrode body 5. The end surface 24 and the end surface 25 are arranged in the width direction W of the electrode body 5.

  The electrode body 5 includes a positive electrode 30 formed on the end surface 24 and a negative electrode 31 formed on the end surface 25.

  The electrode body 5 includes a plurality of positive electrode sheets 26, a plurality of separators 27, and a plurality of negative electrode sheets 28. The electrode body 5 is formed by arranging the positive electrode sheet 26, the separator 27, the negative electrode sheet 28, and the separator 27 in order.

  The positive electrode sheet 26 includes a rectangular aluminum foil and a positive electrode mixture layer formed on the front and back surfaces of the aluminum foil. The aluminum foil is made of aluminum or an aluminum alloy. An uncoated portion 29 in which the positive electrode mixture layer is not formed is formed along one side of the aluminum foil.

  The positive electrode 30 is formed by a plurality of uncoated portions 29 arranged in the thickness direction T of the electrode body 5. In the example shown in FIG. 2, the positive electrode 30 includes a plurality of bundles 32 arranged in the thickness direction T, and each bundle 32 is formed by gathering a plurality of uncoated portions 29 together.

  The negative electrode sheet 28 includes a copper foil formed in a square shape and a negative electrode mixture layer formed on the front and back surfaces of the copper foil. The copper foil is made of copper or a copper alloy.

  In the copper foil, an uncoated portion 33 where the negative electrode mixture layer is not formed is formed along one side of the copper foil. The negative electrode 31 is formed by a plurality of uncoated portions 33 arranged in the thickness direction T. The negative electrode 31 includes a plurality of bundles 34 arranged in the thickness direction T. Each bundle 34 is formed by gathering a plurality of unapplied portions 33 together.

  The front end portion of each bundle 32 is inserted between the leg portions 41 of the positive electrode current collecting terminal 6 and is welded to the leg portions 41 by the welded portion 45.

  The positive electrode current collector terminal 6 and the negative electrode current collector terminal 7 have substantially the same shape. Therefore, the structure of the positive electrode current collector terminal 6 will be described with reference to FIG.

  FIG. 3 is a plan view showing the positive electrode current collecting terminal 6 and the electrode body 5. The pedestal portion 40 is formed in a substantially square shape. A thin portion 39 is formed at a substantially central portion of the pedestal portion 40. The pedestal portion 40 includes side surfaces 42 and 43 and a connection surface 44.

  The side surface 42 and the side surface 43 are arranged in the thickness direction T of the electrode body 5. The side surface 42 extends along the main side surface 22, and the side surface 43 extends along the main side surface 23.

  The connection surface 44 connects the end portion of the side surface 42 on the end surface 25 side and the end portion of the side surface 43 on the end surface 25 side.

  FIG. 4 is a plan view showing the positive electrode current collector terminal 6, and FIG. 5 is a perspective view showing the positive electrode current collector terminal 6. The plurality of leg portions 41 include long leg portions 41A, 41B and short leg portions 41C, 41D, 41E.

  The short leg portion 41C and the short leg portion 41D are disposed with a space therebetween, and the short leg portion 41D and the short leg portion 41E are disposed with a space therebetween.

  The long leg portion 41B protrudes outward from the side surface 43, is then folded back and extends on the pedestal portion 40, and is then inserted between the short leg portion 41D and the short leg portion 41E.

  The long leg portion 41A protrudes outward from the side surface 42A, and then is folded back and extends on the pedestal portion 40. Thereafter, the long leg portion 41A is inserted between the short leg portion 41C and the short leg portion 41D.

  A gap 48A is formed between the short leg portion 41C and the long leg portion 41A. Similarly, a gap 48B is formed between the long leg portion 41A and the short leg portion 41D, and a gap 48C is formed between the short leg portion 41D and the long leg portion 41B. A gap 48D is formed between the long leg portion 41B and the short leg portion 41E. The lower end side of each gap 48A, 48B, 48C, 48D is formed so as to expand.

  FIG. 6 is a plan view showing the positive electrode current collecting terminal 6 in a state in which most of the long leg portions 41A and 41B are omitted. FIG. 7 is a perspective view showing the positive electrode current collecting terminal 6 in a state in which most of the long leg portions 41A and 41B are omitted.

  The pedestal portion 40 includes a connection surface 47 located on the opposite side of the connection surface 44. The connection surface 47 is disposed in the vicinity of the ridgeline of the upper surface 20 and the end surface 24 of the electrode body 5 shown in FIG. The short legs 41 </ b> C, 41 </ b> D, 41 </ b> E are connected to the connection surface 47.

  Connection positions 46C, 46D, and 46E between the short leg portions 41C, 41D, and 41E and the pedestal portion 40 are flush with the connection surface 47, and the connection positions 46C, 46D, and 46E are spaced apart from each other. Yes.

  The short leg portion 41C includes a protruding portion 50C and a hanging portion 51C. The protrusion 50C protrudes outward from the connection surface 47 (connection position 46A). The hanging portion 51C is formed so as to extend downward from the end portion of the protruding portion 50C.

  A tapered portion is formed at the lower end portion of the drooping portion 51C, and the lower end portion side of the drooping portion 51C is formed so that its width decreases as it goes downward.

  The short leg portions 41D and 41E are formed in the same manner as the short leg portion 41C, and include projecting portions 50D and 50E and hanging portions 51D and 51E.

  FIG. 8 is a plan view of the positive current collector terminal 6 with the short legs 41C, 41D, 41E omitted. FIG. 9 is a perspective view of the positive current collector terminal 6 with the short legs 41C, 41D, 41E omitted.

  The long leg portion 41B includes a folded portion 52B, a bent portion 53B, and a hanging portion 54B. The folded portion 52B includes a lower piece 55B and an upper piece portion 56B. The lower piece 55B is connected to the connection position 46B. The upper piece 56B is connected to the lower piece 55B. The upper piece 56B is formed so as to be folded back from the end of the lower piece 55B and extend on the lower piece 55B.

  The bent portion 53B is connected to the upper piece portion 56B. The bent portion 53B is bent so as to extend from the end portion of the upper piece portion 56B toward the connection surface 47, and is disposed on the upper surface of the pedestal portion 40.

  The hanging portion 54B is connected to the end of the bent portion 53B and is formed to extend downward from the end of the bent portion 53B. The lower end portion of the drooping portion 54B is formed in a tapered shape.

  The long leg portion 41A is formed in the same manner as the long leg portion 41B. The long leg portion 41A includes a folded portion 52A, a bent portion 53A, and a hanging portion 54A.

  Thus, each leg part is formed and the positive electrode current collection terminal 6 shown in FIG. 4 and FIG. 5 is formed. The pedestal portion 40 is formed with notches 57A and 57B. The notch 57B is formed at a position adjacent to the connection position 46B between the connection position 46B and the connection position 46E in the outer peripheral edge of the pedestal part 40.

  The notch 57A is formed at a position adjacent to the connection position 46A between the connection position 46C and the connection position 46A in the outer peripheral edge of the pedestal part 40.

  And as shown in FIG. 5, the drooping part 54A of the long leg part 41A is disposed between the short leg part 41C and the short leg part 41D. The hanging portion 54B of the long leg portion 41B is disposed between the short leg portion 41D and the short leg portion 41E.

  FIG. 10 is a side view showing the positive electrode current collector terminal 6 and the electrode body 5. A tip end portion of the bundle 32 of the positive electrode 30 is inserted between the short leg portion 41C and the long leg portion 41A, and the bundle 32, the long leg portion 41A and the short leg portion 41C are welded by the welding portion 45. . Similarly, the bundle 32 inserted between each leg and each leg are welded. The shape of the negative electrode current collector terminal 7 is substantially the same as that of the positive electrode current collector terminal 6.

FIG. 11 is a cross-sectional view schematically showing the configuration of the pedestal portion 40 and its surroundings.
The blocking mechanism 8 is disposed on the lower surface side of the lid 12. A through hole is formed in the lid 12, and a cylindrical tube portion 64 is inserted into the through hole.

  The positive external terminal 3 disposed on the upper surface of the lid 12 includes an insulator 70 and a metal plate 71. The insulator 70 is disposed on the upper surface of the lid 12. The metal plate 71 is disposed on the upper surface of the insulator 70.

  The blocking mechanism 8 includes a holder 60, a reversing plate 61, a rivet 62, and an insulator 63.

  The holder 60 is disposed on the upper surface of the pedestal portion 40 of the positive electrode current collecting terminal 6. The holder 60 is formed of an insulating member. A through hole 60 a is formed in the center of the holder 60.

  The rivet 62 is disposed on the upper surface of the holder 60 and is made of a conductive material such as metal. The rivet 62 includes a base portion 65, a shaft portion 66, and a head portion 67.

  A recess is formed on the lower surface of the base portion 65. The shaft portion 66 is formed on the upper surface of the base portion 65 and is formed to extend upward. The head portion 67 is formed at the upper end portion of the shaft portion 66. The head portion 67 is disposed on the upper surface of the metal plate 71. The rivet 62 connects the insulator 63 and the positive external terminal 3 to the lid 12.

  The inversion plate 61 is disposed in the recess of the base portion 65 of the rivet 62. The outer peripheral edge portion of the reversing plate 61 is welded to the base portion 65 of the rivet 62.

  A central portion of the reversing plate 61 is formed so as to bulge downward. The reverse plate 61 enters the through hole 60 a, and the central portion of the reverse plate 61 is welded to the thin portion 39 by the welded portion 69.

  Since the positive electrode current collector terminal 6 is welded to the positive electrode 30 of the electrode body 5, the positive electrode 30 is electrically connected to the positive electrode external terminal 3 through the positive electrode current collector terminal 6, the reverse plate 61, and the rivet 62. ing. The blocking mechanism 9 is formed in the same manner as the blocking mechanism 8.

  In the sealed battery 1 configured as described above, the internal pressure in the housing case 2 increases in the case of overcharging. When the internal pressure in the storage case 2 becomes a predetermined value or more, the thin portion 39 is broken. When the thin portion 39 is broken, the reversing plate 61 receives the internal pressure in the housing case 2 and is reversed and deformed upward. When the reverse plate 61 is reversely deformed, the reverse plate 61 is separated from the pedestal portion 40. When the reversal plate 61 is separated from the pedestal portion 40, the electrical connection between the positive electrode 30 of the electrode body 5 and the positive electrode external terminal 3 is interrupted. In the shut-off mechanism 9, as in the shut-off mechanism 8, the electrical connection between the negative electrode external terminal 4 and the negative electrode 31 is cut off when the internal pressure in the housing case 2 becomes a predetermined pressure or higher.

  A method for manufacturing the sealed battery 1 will be described. FIG. 12 is a flowchart showing a manufacturing process for manufacturing the sealed battery 1.

  As shown in FIG. 12, the manufacturing process for manufacturing the sealed battery 1 includes the current collecting terminal forming process S1, the electrode body forming process S2, the lid attaching process S3, the terminal assembling process S4, and the housing process S5. The welding step S6, the injection step S7, and the sealing step S8 are included.

  The current collecting terminal forming step S <b> 1 is a step for forming the positive current collecting terminal 6 and the negative current collecting terminal 7. Since the process of manufacturing the positive electrode current collector terminal 6 and the process of manufacturing the negative electrode current collector terminal 7 are similar, the process of manufacturing the positive electrode current collector terminal 6 will be described.

  FIG. 13 is a flowchart showing a manufacturing process for manufacturing the positive electrode current collecting terminal 6. The manufacturing process of the positive electrode current collecting terminal 6 includes a metal plate preparation process S10, a punching process S11, a first bending process S12, and a second bending process S13.

  FIG. 14 is a plan view schematically showing the metal plate preparation step S10. The metal plate preparation step S10 is a step of preparing a metal plate 75 having a predetermined size. The metal plate 75 is aluminum or an aluminum alloy.

  FIG. 15 is a plan view schematically showing the punching step S11. In the punching step S <b> 11, the metal plate 75 is punched to form the terminal plate 76.

  The terminal plate 76 includes a base plate 80, long plates 81A and 81B, and short plates 81C, 81D and 81E.

  The base plate 80 includes side surfaces 82 and 83, a connection surface 84, and an end surface 85. The long plates 81A and 81B are connected to the side surfaces 82 and 83. The connection surface 84 connects one end of the side surface 82 and one end of the side surface 83. The end surface 85 is located on the side opposite to the connection surface 84. A thin portion 39 is formed at the center of the base plate 80.

  The long plate 81 </ b> A is connected to the side surface 82. The long plate 81A includes a protruding plate 90A, a bent portion 91A, and a straight plate 92A.

  The protruding plate 90 </ b> A is formed so as to protrude laterally from the side surface 82 of the pedestal plate 80. The bent portion 91A connects the protruding plate 90A and the straight plate 92A. The straight plate 92A is formed to extend linearly from the end of the bent portion 91A.

  The long plate 81B is formed in the same manner as the long plate 81A. The long plate 81B includes a protruding plate 90B, a bent portion 91B, and a straight plate 92B.

  The short plates 81C, 81D, 81E are formed so as to extend from the end face 85 of the base plate 80.

  A slit 93A is formed between the long plate 81A and the short plate 81C. The slit 93A includes a slit 94A and a slit 95A.

  The slit 94A is formed between the straight plate 92A and the short plate 81C. The slit 95A is connected to the slit 94A. The slit 95A is formed so as to be bent from the slit 95A and extends along the protruding plate 90A.

  A slit 93D is formed between the long plate 81B and the short plate 81E. The slit 93D is formed symmetrically with the slit 93A.

  The slit 93D is formed in the same manner as the slit 93A. The slit 93A includes a slit 94A and a slit 95A.

  The widths of the slits 93 </ b> A and 93 </ b> D are larger than the thickness of the terminal plate 76. For example, the thickness of the terminal plate 76 is about 1.5 mm.

  A slit 93B is formed between the short plate 81C and the short plate 81D, and a slit 93C is formed between the short plate 81D and the short plate 81E.

  The slits 93B and 93C are linearly formed along the respective short plate short plates 81C, 81D, and 81E.

  The widths of the slits 93B and 93C are wider than the widths of the slits 93A and 93D and larger than the thickness of the terminal plate 76.

  In this way, in the punching step S11, the width of the slits 93A, 93B, 93C, 93D is wider than the thickness of the terminal plate 76, and the mold for punching the terminal plate 76 is prevented from being damaged due to thinness and insufficient strength. be able to. Accordingly, the slits 93A, 93B, 93C, and 93D can be formed by press working, and it is possible to suppress the metal mold of the press machine from being thinned and to suppress the mold life from being shortened. Can do. Furthermore, it is difficult to punch a slit having a too small slit width by press working.

  Comparing the lengths of the long plates 81A and 81B with the lengths of the short plates 81C, 81D and 81E, the lengths of the long plates 81A and 81B are longer than the lengths of the short plates 81C, 81D and 81E. L0 is long.

  The long plates 81A and 81B and the short plate 81D are wider than the short plates 81C and 81D. Specifically, the width WA of the long plate 81A is approximately twice the width WC of the short plate 81C.

  FIG. 16 is a front view schematically showing the first bending step S12. In the first bending step S12, the long plate 81A is bent at the bending position L1 shown in FIG. 15, and the long plate 81B is bent at the bending position L2. The folding position L1 is located at the center of the protruding plate 90A, and the bending position L2 is located at the center of the protruding plate 90B.

  A notch 57A is formed by bending the long plate 81A at the bending position L1, and the long plate 81A is positioned in the slit 93B.

  By bending the long plate 81B at the bending position L2, a notch 57B is formed and the long plate 81B is positioned in the slit 93C.

  FIG. 17 is a front view schematically showing the second bending step S13. In the second bending step S13, the base plate 80, the long plates 81A and 81B, and the short plates 81C and 81D are bent at the bending position L3 shown in FIG. In this way, the positive electrode current collector terminal 6 is created.

  The process of forming the negative electrode current collector terminal 7 includes the same process as the process of forming the positive electrode current collector terminal 6. In the metal plate preparation step of the negative electrode current collector terminal 7, a copper plate is prepared. The thickness of the copper plate is, for example, about 1 mm. In the punching process, a copper plate is punched to form a terminal plate. Thereafter, the long plate is bent in the first bending step, and the base plate and the legs are bent in the second bending step, whereby the negative electrode current collector terminal 7 is created.

Next, electrode body formation process S2 is demonstrated.
FIG. 18 is a process flow diagram illustrating a process of manufacturing an electrode body. The step of manufacturing the electrode body includes a sheet forming step S20, a laminating step S21, a foil deformation step S22, and a laminating step S23.

  The sheet forming step S20 includes a step of forming the positive electrode sheet 26, the separator 27, and the negative electrode sheet 28.

  The step of forming the positive electrode sheet 26 includes a step of preparing an aluminum foil sheet, a step of forming a positive electrode mixture layer on the front and back surfaces of the aluminum foil sheet, and an aluminum foil sheet on which the positive electrode mixture layer is formed having a predetermined length. And cutting with. FIG. 19 is a plan view showing the positive electrode sheet 26, and the positive electrode sheet 26 can be formed through the above-described steps. The unapplied portion 29 is formed along one side of the aluminum foil 97.

  The step of forming the negative electrode sheet 28 includes a step of forming a copper foil sheet, a step of forming a negative electrode mixture layer on the front and back surfaces of the copper foil sheet, and a length of the copper foil sheet on which the negative electrode mixture layer is formed. And cutting with. FIG. 20 is a plan view showing the negative electrode sheet 28, and the negative electrode sheet 28 can be formed through the above steps. The unapplied portion 33 is formed along one side of the copper foil 99.

  FIG. 21 is a perspective view schematically showing the lamination step S21. In the stacking step S21, a stacked body 100 is formed in which a plurality of positive electrode sheets 26, separators 27, and negative electrode sheets 28 are sequentially stacked. The uncoated portion 29 of the positive electrode sheet 26 is positioned on one side surface of the laminate 100, and the uncoated portion 33 of the negative electrode sheet 28 is positioned on the other side surface side of the stacked body 100.

  FIG. 22 is a perspective view schematically showing the foil deformation step S22. In the foil deformation step S22, the deformation device 110 is used to deform the tip portions of the plurality of uncoated portions 29 and 33 of the laminate 100 so as to gather together.

  The deformation device 110 includes a mold 101 that deforms the plurality of unapplied portions 29 and a mold 102 that deforms the plurality of unapplied portions 33.

  FIG. 23 is a cross-sectional view schematically showing how the tip of the uncoated portion 33 is deformed. A recess 103 is formed in the mold 102. By pressing the tip portions of the plurality of uncoated portions 33 against the inner surface of the recess 103, as shown in FIG. 24, each uncoated portion 33 is deformed so that the tip portions are gathered together to form a bundle 104. Is done. The uncoated portion 29 is similarly deformed by the mold 101 to form a bundle.

  FIG. 25 is a perspective view schematically showing the stacking step S23. In the stacking step S <b> 23, a plurality of stacked bodies 100 in which the bundle 104 of the uncoated part 33 and the bundle 105 of the uncoated part 29 are formed are stacked. Thereby, the electrode body 5 is formed.

  Next, in the lid attaching step S3, the blocking mechanisms 8 and 9, the lid 12, the positive current collecting terminal 6 and the negative current collecting terminal 7 are assembled. Thereby, the electrode body 5, the positive electrode current collection terminal 6, the negative electrode current collection terminal 7, and the lid | cover 12 are connected integrally.

  Next, the terminal assembly step S4 shown in FIG. 12 will be described. FIG. 26 is a process flowchart showing the terminal assembly process S4. The terminal assembly process S4 includes a slit insertion process S30, a terminal pressurization process S31, and a welding process S32.

  FIG. 27 is a perspective view schematically showing the slit insertion step S30. In addition, illustration of the blocking mechanism, the lid, and the like above the pedestal is omitted. In the slit insertion step S <b> 30, the insertion jig 120 is disposed above the electrode body 5, and the positive current collector terminal 6 and the negative current collector terminal 7 are disposed above the insertion jig 120.

  The insertion jig 120 includes a jig 121 and a jig 122. The jig 121 is disposed above the bundle 105 of the electrode bodies 5. The insertion jig 120 is formed in a substantially rectangular parallelepiped shape, and a plurality of groove portions 126 are formed on one side surface of the insertion jig 120.

  The jig 122 is also formed in a rectangular parallelepiped shape, and a plurality of groove portions 127 are also formed on one side surface of the jig 122.

  The jig 121 and the jig 122 are arranged so that the groove 126 and the groove 127 face each other.

  The positive electrode current collecting terminal 6 is disposed so that the leg portion 41 is located above the groove portion 126. The negative electrode current collecting terminal 7 is disposed so that the leg portion 36 is located above the groove portion 127.

  FIG. 28 is a front view showing the groove 126, the leg 41, and the like. As shown in FIG. 28, each groove 126 of the insertion jig 120 is disposed above each bundle 105 of the electrode body 5. The gaps 48A, 48B, 48C, 48D of the positive electrode current collector terminal 6 are disposed above the groove 126.

  In this manner, the electrode body 5 is moved upward in a state where the insertion jig 120 and the positive electrode current collecting terminal 6 are arranged. When the electrode body 5 is moved upward, the tip of each bundle 105 passes through each groove 126. At this time, since the width of the lower end portion of each groove portion 126 is formed so as to increase downward, it is easy to insert the front end portion of the bundle 105 into the groove portion 126, and the uncoated portion 29 is prevented from being bent. be able to.

  And the width | variety of the groove part 126 is formed so that it may become narrow as it goes upwards from a lower end part side. For this reason, it deform | transforms so that the width | variety of each front-end | tip part of the bundle | flux 105 may become small as the electrode body 5 is moved upwards.

  Further, when the electrode body 5 is moved upward, the upper end portion of each bundle 105 is pulled out from each groove portion 126 and then inserted into the gaps 48A, 48B, 48C, 48D. Then, the bundle 105 is sequentially inserted into the gaps 48A, 48B, 48C, and 48D by further raising the electrode body 5.

  FIG. 29 is a cross-sectional view showing a part of the positive electrode current collector terminal 6 after the slit insertion step S30. A bundle 105 is inserted into a gap 48D formed between the short leg portion 41E and the long leg portion 41B. In the other gaps 48A, 48B, 48C, the bundle 105 is similarly inserted.

  In addition, also in the negative electrode current collection terminal 7, the bundle 104 is inserted in each gap after the slit insertion step S30.

  Next, terminal pressurization process S31 is demonstrated. The terminal pressurization step S31 is a step of pressurizing the positive electrode current collector terminal 6 and the negative electrode current collector terminal 7 from the side direction to narrow the width of the gap between each positive electrode current collector terminal 6 and the negative electrode current collector terminal 7.

  FIG. 30 is a perspective view showing the positive electrode current collector terminal 6 in the terminal pressurizing step S31, and FIG. 31 is a cross-sectional view showing the positive electrode current collector terminal 6 in the terminal pressurizing step S31. In terminal pressurization process S31, the positive electrode current collection terminal 6 is pressurized so that the width | variety of each clearance gap 48A, 48B, 48C, 48D may become narrow. Specifically, a load P1 is applied to the short legs 41C and 41E.

  As shown in FIG. 31, a load P1 is applied to the short leg portion 41C and the short leg portion 41E. As a result, the width of each gap 48A, 48B, 48C, 48D becomes narrow. Thereby, the clearance gap between each bundle 105 and each short leg part 41C, long leg part 41A, short leg part 41D, long leg part 41B, and short leg part 41E becomes small.

  FIG. 32 is a perspective view schematically showing the positive electrode current collecting terminal 6 in the terminal pressurizing step S31. In FIG. 32, the load P1 is applied to the short legs 41C and 41E, while the widths WC and WE of the short legs 41C and 41E are the widths WA, WB and W of the long legs 41A and 41B and the short legs 41D, respectively. Narrower than WD. On the other hand, the thickness of each leg is the same.

  For this reason, the cross-sectional secondary moments of the short legs 41C and 41E are smaller than the cross-sectional secondary moments of the long legs 41A and 41B and the short legs 41D.

  When the load P1 is applied to the short legs 41C and 41E, the short legs 41C and 41E are in a state where a cantilever load is applied. When a cantilever load is applied to the short legs 41C and 41E, if the cross-sectional secondary moment of the short legs 41C and 41E is small, the short legs 41C and 41E are easily bent.

  A cutout portion 57B is formed on the extension of the short leg portion 41E. When the load P1 is applied to the end portion side of the short leg portion 41E, the cutout portion 57B is deformed so as to expand. By deforming the cutout portion 57B so as to expand, the short leg portion 41E is easily bent in the load direction of the load P1.

  For this reason, even if the load P1 is kept small, the amount of bending of the short leg portion 41C and the short leg portion 41E can be increased. Since the short legs 41C and 41E are large and easily bent, the gaps 48A and 48D tend to be small.

  Then, the load P1 applied to the short legs 41C and 41E is applied to the long legs 41A and 41B through the bundle 105.

  The lengths of the long leg portions 41A and 41B are longer than the lengths of the short leg portions 41C and 41E and the short leg portion 41D.

  Generally, in a cantilever beam, when the amount of bending is constant, the magnitude of the bending load is inversely proportional to the cube of the length of the beam. Therefore, the long legs 41A and 41B are easily bent in the load direction, and even if the load P1 is kept small, the long legs 41A and 41B are bent and the gaps 48B and 48C are reduced.

  Thus, the load P1 applied to the positive electrode current collector terminal 6 in order to reduce each gap can be kept small.

  Since the load P1 can be suppressed to be small, it is possible to suppress deformation of the portions other than the leg portions by applying the load P1 to the short leg portions 41C and 41E. For example, deformation of the pedestal 40 and the thin portion 39 formed on the pedestal 40 can be suppressed.

  Since the deformation of the pedestal portion 40 and the thin portion 39 is suppressed, the influence on the blocking mechanism 8 provided in the pedestal portion 40 can be suppressed small. Thereby, it can suppress that the internal pressure in the storage case 2 which the interruption | blocking mechanism 8 drives changes from a predetermined internal pressure.

  The negative current collector terminal 7 is pressed in the same manner as the positive current collector terminal 6. At this time, since the negative electrode current collector terminal 7 is formed in the same manner as the positive electrode current collector terminal 6, the internal pressure of the housing case 2 driven by the blocking mechanism 9 provided on the pedestal of the positive electrode current collector terminal 6 is determined in advance. Fluctuation from the given pressure can be suppressed.

  Furthermore, in FIG. 31, since the magnitude | size of the load P1 can be restrained small, either the short leg part 41C, 41D, 41E and the long leg part 41A, 41B of the positive electrode current collection terminal 6 is suppressed from floating. The short leg portions 41C, 41D, 41E and the long leg portions 41A, 41B of the positive electrode current collecting terminal 6 can be maintained in a line.

  Next, in the welding step S32, the legs and the bundle 105 of the positive electrode current collector terminal 6 are welded, and the legs and the bundle of the negative electrode current collector terminal 7 are welded.

  The welding process of the positive electrode current collecting terminal 6 and the bundle 105 and the welding process of the negative electrode current collecting terminal 7 and the bundle 105 are substantially the same.

  FIG. 33 is a perspective view showing a state in which the positive electrode current collector terminal 6 and the bundle 105 are welded, and FIG. 34 is a cross-sectional view showing a state in which the positive electrode current collector terminal 6 and the bundle 105 are welded.

  The tip of each bundle 105 protrudes from the gaps 48A, 48B, 48C, 48D. In the example shown in FIGS. 33 and 34, the tip of the bundle 105 is welded to the short legs 41C, 41D, 41E and the long legs 41A, 41B of the positive electrode current collector terminal 6 using a laser. In this way, the bundle 105 of the uncoated portions 29 is welded to the positive electrode current collecting terminal 6.

  In the terminal pressurizing step S31, since the width of each gap 48A, 48B, 48C, 48D is narrowed, the laser passes between the gaps 48A, 48B, 48C, 48D and the bundle 105 and enters the electrode body side. Can be suppressed. Similarly, the negative electrode current collecting terminal 7 and each bundle are welded. Further, when the tip of the bundle 105 is irradiated with a laser, metal pieces such as the uncoated portion 29 may break and scatter. Moreover, the melt | fusion part of the uncoated part 29 and the positive electrode current collection terminal 6 may be scattered. Even if the metal piece or the melted portion is scattered, the width of each gap 48A, 48B, 48C, 48D is narrowed, so the metal piece or the melted portion is moved from the gap 48A, 48B, 48C, 48D to the electrode body 5 side. It can suppress entering.

In this way, the terminal assembling step S4 shown in FIG. 12 is completed.
FIG. 35 is a schematic diagram schematically showing the housing step S5. The electrode body 5, the positive electrode current collector terminal 6, and the negative electrode current collector terminal 7 are accommodated in the case body 11. The lid 12 is disposed so as to close the opening of the case body 11.

  In the welding step S6, the outer peripheral edge of the lid 12 and the opening edge of the case body 11 are welded.

  In the injection step S <b> 7, the electrolytic solution 10 is injected into the housing case 2 from the injection port 13 a of the lid 12. In the sealing step S8, the inlet 13a is closed with the sealing member 13, and the sealed battery 1 shown in FIG. 1 is formed.

  Next, the manufacturing method of sealed battery 1A and sealed battery 1A according to the comparative example is compared with the manufacturing method of sealed battery 1 and sealed battery 1 according to the present embodiment.

  FIG. 36 is a perspective view showing a part of a sealed battery 1A according to a comparative example. The sealed battery 1A includes an electrode body 5, a positive current collector terminal 6A, and a negative current collector terminal (not shown).

  The positive electrode current collector terminal 6A of the sealed battery 1A is made of aluminum or the like, and the negative electrode current collector terminal of the sealed battery 1A is made of copper or the like. The shape of the positive electrode current collector terminal 6A of the sealed battery 1A and the shape of the negative electrode current collector terminal are substantially the same.

  The configuration of the sealed battery 1A according to the comparative example and the sealed battery 1 of the present embodiment is substantially the same except for the positive electrode collector terminal and the negative electrode collector terminal.

  The manufacturing process of the sealed battery 1A of the comparative example is the same as the manufacturing process of the sealed battery 1 according to the present embodiment.

  Specifically, the manufacturing process of the sealed battery 1A includes the current collecting terminal forming step S1, the electrode body forming step S2, the terminal assembly step S3, the lid attaching step S4, the housing step S5, and the welding step S6. And an injection step S7 and a sealing step S8.

  The manufacturing process of the sealed battery 1A is the same as the manufacturing process of the sealed battery 1 except for the terminal pressurizing process S31 of the terminal assembling process S3.

  FIG. 37 is a perspective view showing a terminal pressurizing step S31 of the sealed battery 1A. FIG. 38 is a cross-sectional view showing a terminal pressurizing step S31 of the sealed battery 1A.

  Also in the terminal pressurization step S31 of the sealed battery 1A, the load P2 is applied to the positive electrode current collector terminal 6A so as to narrow the gap between the leg portions 151.

  In FIG. 37, the length of the leg portion 151 of the positive current collecting terminal 6A is shorter than the length of the long leg portions 41A and 41B of the positive current collecting terminal 6.

  For this reason, the leg part 151 is harder to bend than the long leg parts 41A and 41B, and the load P2 required to narrow the gap between the leg parts 151 is larger than the load P1.

  When the load P2 applied to the positive electrode current collecting terminal 6A is increased, the arrangement state of the legs 151 is easily disturbed as shown in FIG. As a result, a gap is easily generated between the leg portion 151 and the bundle 105.

  When the load P2 applied to the leg 151 is increased, the leg 151 is connected to the pedestal 150, so that the pedestal 150 and the thin portion 39 are easily deformed greatly.

  If the base part 150 and the thin part 39 deform | transform, the interruption | blocking mechanism arrange | positioned on the base part 150 will be easy to be influenced. Specifically, there is a possibility that the shut-off mechanism arranged on the pedestal portion 150 is difficult to operate with a predetermined internal pressure of the housing case 2.

  FIG. 39 is a cross-sectional view schematically showing the welding step S32. As shown in FIG. 39, the bundle 105 protruding from the gap between the leg portions 151 is irradiated with laser, and the bundle 105 and the leg portion 151 are welded.

  At this time, since the arrangement of the leg portions 151 is disturbed, there is a high possibility that a gap is generated between the bundle 105 and the leg portions 151. For this reason, there is a possibility that the laser beam may escape from the gap between the bundle 105 and the leg 151 and reach the electrode body.

  Further, when welding with a laser, a part of the bundle 105 may be broken and scattered, or a molten part of the bundle 105 may be scattered. At this time, if there is a gap between the bundle 105 and the leg 151, a part of the bundle 105 or a melted portion may come out from the gap to the electrode body side.

  Also in the manufacturing process of the sealed battery 1A, similarly to the sealed battery 1, the sealed battery 1A is manufactured by performing various processes after the welding step S32.

  Thus, according to the sealed battery 1 and the manufacturing method of the sealed battery 1 according to the present embodiment, it is possible to suppress fluctuations in the operating pressure of the blocking mechanism.

  Further, in the manufacturing process of the sealed battery 1, it is possible to prevent the electrode body from being irradiated with a laser, or a part of the uncoated part or a melted part of the uncoated part from being attached to the electrode body.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present disclosure is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1, 1A sealed battery, 2 housing case, 3 positive external terminal, 4 negative external terminal, 5 electrode body, 6, 6A, 7 terminal, 8, 9 shut-off mechanism, 10 electrolyte, 11 case body, 12 lid, 13 Sealing member, 13a inlet, 20 upper surface, 21 lower surface, 22, 23 main side surface, 24, 25, 85 end surface, 26 positive electrode sheet, 27 separator, 28 negative electrode sheet, 29, 33 uncoated part, 30 positive electrode, 31 negative electrode 32, 34, 104, 105 bundle, 35, 40, 150 pedestal part, 36, 41, 151 leg part, 37, 45, 69 welded part, 39 thin part, 41A, 41B long leg part, 41C, 41D, 41E Short leg part, 42, 42A, 43, 82, 83 Side face, 44, 47, 84 Connection face, 46A, 46B, 46C, 46E Connection position, 48A, 48B, 48C, 48D , 50C, 50D, 50E Protruding part, 51C, 51D, 51E, 54A, 54B Hanging part, 52A, 52B part, 53A, 53B, 91A, 91B Bending part, 55B Lower piece, 56B Upper piece part, 57A, 57B Notch part , 60 holder, 60a through hole, 61 reversal plate, 62 rivet, 63,70 insulator, 64 cylinder portion, 65 base portion, 66 shaft portion, 67 head portion, 71,75 metal plate, 76 terminal plate, 80 base plate, 81A, 81B long plate, 81C, 81D, 81E short plate, 90A, 90B protruding plate, 92A, 92B straight plate, 93A, 93B, 93C, 93D, 94A, 95A slit, 97 aluminum foil, 99 copper foil, 100 laminate , 101, 102 Mold, 103 recess, 110 deformation device, 120 insertion jig, 121, 122 jig, 12 , 127 Groove, H height direction, L0 length, L1, L2, L3 position, P1, P2 load, S1 terminal formation process, S2 electrode body formation process, S3 terminal assembly process, S4 lid attachment process, S5 accommodation process , S6, S32 welding process, S7 injection process, S8 sealing process, S10 metal plate preparation process, S11 punching process, S12, S13 process, S20 sheet forming process, S21, S23 laminating process, S22 foil deformation process, S30 slit insertion Step, S31 Terminal pressurizing step, T thickness direction, W width direction, WA, WB, WC, WD, WE width.

Claims (1)

An electrode body;
A current collecting terminal welded to the electrode body;
With
The electrode body is
A first end face and a second end face arranged in the width direction of the electrode body;
An electrode formed on the first end face;
Including
The current collecting terminal is
A pedestal disposed on the upper surface of the electrode body;
A plurality of legs connected to the pedestal and disposed on the first end face and welded to the electrodes;
Including
The pedestal is
A first side surface and a second side surface arranged in the thickness direction of the electrode body;
A connection surface that connects an end portion of the first side surface on the second end surface side and an end portion of the second side surface on the second end surface side;
Including
The plurality of legs include a plurality of first legs formed at intervals, and a second leg disposed between the first legs.
The connection portion of the second leg portion with the pedestal portion is located closer to the connection surface than the connection portion of the first leg portion with the pedestal portion,
The second leg portion passes through the pedestal portion from a connection portion with the pedestal portion, and is disposed between the plurality of first leg portions.