JP2011076885A - Battery, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of securing fitting accuracy between an opening of a battery case and a lid plate member, and to provide a manufacturing method thereof. <P>SOLUTION: The battery includes a battery case for storing a battery element, and the lid plate member for blocking an opening of the battery case. A mounting port section is formed on the lid plate member, and a terminal structure section mounted on the mounting port section is arranged. The terminal structure section has a metal plate wherein an electrode terminal is arranged to project outside the lid plate member and a collector member is arranged to project inside the battery case, and the metal plate is mounted on the lid plate member so as to block the mounting port section by fixing the collector member and the electrode terminal on the metal plate by crimping. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a battery such as a nonaqueous electrolyte secondary battery and a method for manufacturing the same, and more particularly to a structure and a method for manufacturing the lid.

  As this type of battery, for example, a technique shown in Patent Document 1 below has been proposed. This comprises a battery case that houses the battery element and a metal (for example, aluminum) lid plate member that closes the opening of the battery case, and the electrode terminals are inserted through the lid plate member so as to protrude outside. The electrode member and the current collecting member are arranged on the back side of the cover plate member so that the electric member protrudes into the battery case, and the end portion of the electrode terminal is caulked against the current collecting member. It is configured to be fixed to. And the cover plate member comprised in this way is fixed so that the opening part of a battery case may be plugged up.

JP-A-8-77999

  When the electrode terminal and the current collecting member are fixed to the lid plate member by caulking the electrode terminal to the current collecting member as in the conventional battery, the caulking force is applied to the lid plate member, and the lid plate member is deformed. May end up. Then, the fitting accuracy between the lid plate member and the opening of the battery case is lowered, and there is a problem that welding failure occurs when the lid plate member is laser welded to the opening of the battery case.

  Therefore, in view of the above problems, the present invention can ensure the fitting accuracy between the opening of the battery case and the lid plate member, and can eliminate poor welding when the lid plate member is laser welded to the opening of the battery case. An object is to provide a battery and a method for manufacturing the same.

  The present invention provides a battery including a battery case that houses a battery element and a cover plate member that closes an opening of the battery case, wherein a caulking member is inserted into a caulking member insertion hole formed in the closing member, and the caulking member is inserted into the caulking member. The member is fixed to the closing member by caulking, and the closing member is mounted on the lid plate member so that the closing member mounting opening formed in the lid plate member is closed by the closing member.

  In the above configuration, the caulking member is fixed to the closing member separate from the cover plate member by caulking. That is, with the above configuration, the caulking member can be caulked in advance with the closing member, so that the lid plate member is not deformed by caulking force, and thus the accuracy of fitting the lid plate member to the opening of the battery case is ensured. The

  The present invention provides a battery manufacturing method including a battery case that houses a battery element and a lid plate member that closes an opening of the battery case, and the caulking member is inserted into a caulking member insertion hole formed in the closing member. After the caulking member is caulked and fixed to the closing member, the closing member is mounted on the lid plate member so as to close the closing member mounting opening formed in the lid member with the closing member.

  According to the above method, the caulking member is not fixed to the lid plate member by caulking, but the caulking member is fixed to the closing member in advance by caulking, and then the closing member is attached to the lid plate member. The caulking force does not act, and therefore the lid plate member is not deformed by caulking, and the accuracy of fitting the lid plate member to the opening of the battery case can be ensured.

  According to the battery of the present invention, since the caulking member is fixed to the closing member separate from the lid plate member by caulking, there is no deformation of the lid plate member due to caulking force, and therefore the lid for the opening of the battery case. The fitting accuracy of the plate member can be ensured.

  According to the battery manufacturing method of the present invention, the caulking member is not fixed to the cover plate member by caulking, but the caulking member is fixed to the closing member in advance by caulking, and then the closing member is attached to the lid plate member. Thus, the caulking force does not act on the lid plate member, and therefore the lid plate member is not deformed by caulking, and the accuracy of fitting the lid plate member to the opening of the battery case can be ensured.

The perspective view of the battery which shows 1st embodiment of this invention. Sectional view of the terminal structure Similarly, a sectional view of a state where the terminal structure is mounted on the cover plate member Similarly, a plan view of a state where the terminal structure is mounted on the cover plate member Sectional drawing of the terminal structure part of the battery which shows 2nd embodiment of this invention Similarly, a sectional view of a state where the terminal structure is mounted on the cover plate member Similarly, a plan view of a state where the terminal structure is mounted on the cover plate member Sectional drawing of the state which mounted | wore the cover board member with the terminal structure part of the battery which shows 3rd embodiment of this invention Sectional drawing of the state which mounted | wore the cover board member with the terminal structure part of the battery which shows 4th embodiment of this invention

  Hereinafter, a battery according to an embodiment of the present invention will be described with reference to the drawings, taking a non-aqueous electrolyte secondary battery as an example. First, a first embodiment will be described with reference to FIGS. 1 is a perspective view of a nonaqueous electrolyte secondary battery showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a terminal structure portion, and FIG. 3 is a cross-sectional view of a state in which the terminal structure portion is mounted on a cover plate member. FIG. 4 is a plan view showing a state in which the terminal structure is mounted on the cover plate member.

  As shown in these drawings, the nonaqueous electrolyte secondary battery 1 includes a battery case 12 that houses a battery element 11, a lid plate member 13 that closes an opening 121 of the battery case 12, and a terminal structure portion 2. ing. As the battery element 11, for example, a type formed in a long cylindrical winding type is used. The battery case 12 is formed in a rectangular cylindrical shape, and one side is opened to form the opening 121. The battery case 12 is formed from a stainless steel plate, an aluminum alloy plate, or the like.

  The lid plate member 13 provided with the terminal structure 2 is mounted so as to seal the opening 121. The cover plate member 13 is formed in a rectangular shape according to the shape of the opening 121, and a peripheral wall 131 that is fitted on the four sides so as to overlap the inside of the opening 121 is integrally provided upright. The lid plate member 13 is made of a stainless steel plate, an aluminum alloy plate, or the like. The peripheral wall 131 of the cover plate member 13 is fixed inside the opening 121 by, for example, laser welding. A rectangular closing member mounting port portion (hereinafter referred to as “mounting port portion”) 133 is formed near each end portion of the cover plate surface 132 of the cover plate member 13 while leaving a part of the cover plate surface 132 around the periphery. Has been. The terminal structure portion 2 is attached to each attachment port portion 133.

  Here, the structure of the terminal structure part 2 is demonstrated. The configuration of each terminal structure 2 is only symmetrical in the width direction B of the cover plate member 13 and the basic configuration is the same. Therefore, one terminal structure 2 shown in FIGS. With the explanation, it is also used for explanation of the other terminal structure portion 2.

  The terminal structure portion 2 is formed with an area slightly larger than the opening area of the mounting opening 133 and seals the mounting opening 133 (in this case, a metal plate is used, but a resin plate 21), an electrode terminal 22 having a terminal plate 222 in the middle of a bolt-shaped shaft body 221, a current collecting member 23, and an insulating packing 24.

  The closing member 21 is formed as a single flat plate from a stainless steel plate or an aluminum alloy plate. The current collecting member 23 is formed of an aluminum alloy plate when used as the positive electrode side, and a copper alloy plate or a nickel alloy plate when used as the negative electrode side. The current collecting member 23 includes a mounted portion 231 formed in a flat plate shape, and a connecting portion 232 that is integrally extended in a right angle direction from one end portion of the mounted portion 231 and connected to the battery element 11. Is formed. A hole 231a is formed at substantially the center of the attached portion 231 so that the one end side of the shaft body 221 of the electrode terminal 22 can be inserted.

  The insulating packing 24 is in contact with the terminal plate 222 and covers the shaft body 221 with a part of the back side (attached portion 231 side of the current collecting member 23), and the attached portion 231 on the front side ( It is composed of a combination of current collecting member side packings 242 that are entirely covered with the terminal board 222 side).

  The terminal-side packing 241 is integrally formed from a small-diameter portion 241 a that fits inside a hole 21 a formed at the center of the closing member 21 and a large-diameter portion 241 b that contacts the back surface of the electrode terminal 22. The current collecting member side packing 242 is provided with a flat plate portion 2421 in which a hole 242 a is formed so as to pass through one end portion of the shaft body 221 of the electrode terminal 22 and abuts against the back surface of the closing member 21. A wall portion 2422 that rises inward of the battery case 12 is integrally formed on three sides of the flat plate portion 2421.

  One end portion side of the shaft body 221 is inserted from the terminal side packing 241 and the flat plate portion 2421 of the current collecting member side packing 242 and is caulked from the back side of the attached portion 231 of the current collecting member 23. As described above, the terminal structure portion 2 includes the closing member 21, the electrode terminal 22, and the current collecting member due to the configuration in which one end portion of the shaft body 221 is caulked from the back side of the attached portion 231 of the current collecting member 23. 23 and an insulating packing 24 are integrated as a unit. Therefore, in this embodiment, the shaft body 221 corresponds to the caulking member.

  The terminal structure portion 2 is manufactured by attaching a terminal side packing 241 to one end side of the shaft body 221, fitting the small diameter portion 241 a into a hole 21 a formed at the center of the closing member 21, and The current collecting member side packing 242 is attached through one end side of the shaft 221, and the attached portion 231 of the current collecting member 23 is passed through the hole 231 a through the one end side of the shaft body 221. Overlay the current collecting member side packing 242. One end of the shaft body 221 of the electrode terminal 22 is caulked at the approximate center in this state. By doing in this way, the terminal structure part 2 is made into the unit which integrated the closure member 21, the electrode terminal 22, the current collection member 23, and the packing 24 for insulation.

  In the terminal structure portion 2 thus unitized, the end portion of the closing member 21 is applied from the back side of the mounting port portion 133 of the lid plate member 13, and the opening end portion of the mounting port portion 133 and the surface of the closing member 21. The side is integrated by laser welding. Since the closing member 21 is formed in an area slightly larger than the opening area of the mounting opening 133, the opening of the mounting opening 133 can be closed. Subsequently, the cover plate member 13 is attached to the opening 121 of the battery case 12 and fixed by laser welding. That is, the electrode terminal 22 is exposed to the outside from the cover plate member 13, and the current collecting member 23 is located inside the battery case 12.

  Prior to mounting on the lid plate member 13, the shaft body 221 is fixed to the closing member 21 by caulking, so that the caulking force does not reach the lid plate member 13. Therefore, the lid plate member 13 is not deformed, and the fitting accuracy with respect to the opening 121 of the lid plate member 13 can be improved.

  Next, based on FIG. 5 thru | or FIG. 7, 2nd embodiment of this invention is described. FIG. 5 is a cross-sectional view of the battery terminal structure according to the second embodiment of the present invention, FIG. 6 is a cross-sectional view of the terminal structure mounted on the cover plate member, and FIG. It is a top view of the state with which it attached to.

  In the second embodiment, the terminal structure unit 3 includes the caulking member 31 and the bus bar 32, and the electrode terminal 33 and the current collecting member 34 of the terminal structure unit 3 are disposed so as to be displaced in the width direction. . In the first embodiment, the closing member 21, the electrode terminal 22, the current collecting member 23, and the insulating packing 24 are integrated by caulking one end portion of the shaft body 221 of the electrode terminal 22. On the other hand, in the terminal structure portion 3 of the second embodiment, the current collecting member side end portion of the caulking member 31 different from the electrode terminal 33 has a connecting portion of the current collecting member 34 having the connection portion 342. The closing member 35, the electrode terminal 33, the current collecting member 34, the insulating packing 36, and the bus bar 32 are integrated. The other configurations of the battery case 12 and the cover plate member 13 are the same as those in the first embodiment, and thus the same reference numerals are given and the description thereof is omitted.

  More specifically, the terminal side packing 361 is overlaid on the surface side of the closing member 35, the buser 32 is overlaid on the surface side of the terminal side packing 361, and the head 331 of the bolt-shaped electrode terminal 33 is attached to the terminal side packing 361. The body portion 332 of the electrode terminal 33 is embedded on one side and is exposed from the surface of the bus bar 32 through the hole 32 a of the bus bar 32. The terminal side packing 361 is integrally formed from a plate-like portion 3611 formed in a larger area than the bus bar 32 and a cylindrical portion 3612 inserted into the hole 35 a of the closing member 35. A head portion 331 of the electrode terminal 33 is embedded in the plate-like portion 3611.

  A flat plate portion 3621 of the current collecting member side packing 362 is overlaid on the back surface of the closing member 35, and a mounted portion 341 of the current collecting member 34 is overlaid on the back surface of the flat plate portion 3621. The caulking member 31 includes a hole 32 b of the bus bar 32, a hole 361 a of the terminal side packing 361, a closing member 35, a hole 3621 a of the flat plate portion 3621 of the current collecting member side packing 362, and One end of the caulking member 31 (the inner end of the battery case 12) is caulked to the attached portion 341 through the hole 341a, and the other end of the caulking member 31 (the outer side of the battery case 12). The end) is caulked to the bus bar 32. With this configuration, a unit of the terminal structure unit 3 is configured in which the electrode terminal 33, the bus bar 32, the terminal side packing 361, the closing member 35, the current collecting member side packing 362, and the current collecting member 34 are integrated.

  Then, as shown in FIG. 6, the end portion of the closing member 35 of the terminal structure portion 3 is applied from the back side of the mounting port portion 351 of the cover plate member 13, and the opening end portion of the mounting port portion 351 and the closing member 35 are The front side is integrated by laser welding. Since the blocking member 35 is formed in an area slightly larger than the opening area of the mounting opening 351, the opening of the mounting opening 351 can be closed.

  Subsequently, the cover plate member 13 is attached to the opening 121 of the battery case 12 and fixed by laser welding. That is, the electrode terminal 33 is exposed to the outside from the cover plate member 13, and the current collecting member 34 is located inside the battery case 12. Also in this configuration, the caulking member 31 is fixed to the closing member 35 by caulking prior to being attached to the lid plate member 13, so that caulking force does not reach the lid plate member 13. Therefore, the lid plate member 13 is not deformed, and the fitting accuracy with respect to the opening 121 of the lid plate member 13 can be improved.

  Next, a third embodiment will be described based on FIG. FIG. 8 is a cross-sectional view of the battery terminal structure according to the third embodiment of the present invention attached to the cover plate member. Since the structure of the terminal structure part 3 in the third embodiment is the same as that of the second embodiment, the same reference numerals are given and description thereof is omitted. In the second embodiment, the closing member 35 is fixed by being applied from the back side of the mounting opening 351 of the lid plate member 13, whereas in the third embodiment, the closing member 35 is attached to the lid plate member 13. Is attached from the front side (outside) of the mounting opening 351 and is fixed by laser welding from the outside of the lid plate member 13. Also in this configuration, the caulking member 31 is fixed to the closing member 35 by caulking prior to being attached to the lid plate member 13, so that caulking force does not reach the lid plate member 13. Therefore, the lid plate member 13 is not deformed, and the fitting accuracy with respect to the opening 121 of the lid plate member 13 can be improved.

  A fourth embodiment will be described with reference to FIG. FIG. 9 is a cross-sectional view of the battery terminal structure according to the fourth embodiment of the present invention attached to the cover plate member. Since the structure of the terminal structure portion 3 in the fourth embodiment is the same as that of the second embodiment and the third embodiment, the same reference numerals are given and the description thereof is omitted.

  In the fourth embodiment, a placing piece 3511 for placing the closing member 35 on the edge on the back side of the mounting opening 351 of the lid plate member 13 is fixed by welding or the like. The size and shape of the closing member 35 are formed so as to match the size and shape of the mounting opening 351, and the closing member 35 is placed on the mounting piece 3511 so as to be fitted in the mounting opening 351. A fitting portion between the closing member 35 and the mounting opening 351 is laser-welded from the surface side.

  Also in this configuration, the caulking member 31 is fixed to the closing member 35 by caulking prior to being attached to the lid plate member 13, so that caulking force does not reach the lid plate member 13. Therefore, the lid plate member 13 is not deformed, and the fitting accuracy with respect to the opening 121 of the lid plate member 13 can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Non-aqueous electrolyte secondary battery, 12 ... Battery case, 2 ... Terminal structure part, 11 ... Battery element, 13 ... Cover plate member, 21, 35 ... Closure member, 22 ... Electrode terminal, 23 ... Member for current collection, 24 ... Insulating packing, 31 ... Caulking member, 32 ... Basper, 121 ... Opening part, 132 ... Cover plate surface, 133 ... Mounting port part, 221 ... Shaft body, 231 ... Mounted part, 232 ... Connection part, 241 ... Terminal side packing, 242 ... Current collecting member side packing, 2421 ... Flat plate part, 2422 ... Wall part

Claims (2)

In a battery comprising a battery case that houses a battery element, and a lid member that closes an opening of the battery case,
A caulking member is inserted into a caulking member insertion hole formed in the closing member, the caulking member is fixed to the closing member by caulking, and the closing member is blocked by the closing member mounting opening formed in the lid plate member. The battery is characterized in that the closing member is attached to the cover plate member. In a battery manufacturing method comprising a battery case for storing a battery element, and a lid member that closes an opening of the battery case,
The caulking member is inserted into a caulking member insertion hole formed in the closing member, and after the caulking member is caulked and fixed to the closing member, the closing member mounting port formed in the lid member is closed with the closing member. A battery manufacturing method comprising mounting a closing member on a cover plate member.

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