JP2011060672A - Manufacturing device and manufacturing method for battery, and battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device and manufacturing method for a battery in which a distortion is not caused in a case such as a lid portion even if an excess thickness is produced in a burring portion due to an excessively large press load on the burring portion, and to provide the battery. <P>SOLUTION: In the manufacturing device for the battery 10, an electrode terminal 40 is inserted into a through hole 33 of a lid portion 32 with an insulation member 50 interposed and a burring portion 34 is pressed from an outer side of a case 30 to connect the electrode terminal 40 with the lid portion 32 in a state that a ring-shaped member 35 is engaged with an outer circumference of the burring portion 34 in the through-hole 33. The device is provided with a die 60 in contact with an inner face of the lid portion 32 including a burring portion forming part and a punch 70 for pressing the burring portion 34 from an outer side of the case 30. The die 60 is provided with a float portion 62 and an energizing spring 63 for constituting an excess thickness accommodating means capable of accommodating the excess thickness caused by pressing of the burring portion 34 by the punch 70. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, the electrode terminal is inserted into the through-hole through the insulating member, and the burring portion is fitted in an annular member that restrains the burring portion from the outer peripheral side on the outer periphery of the burring portion in the through-hole. The present invention relates to a battery in which the electrode terminal and the case are coupled by pressing from the outside of the case to cause plastic deformation, and a manufacturing apparatus and a manufacturing method thereof.

In a battery such as a lithium ion secondary battery, it is known that a power generation element is housed in a case, and an electrode terminal connected to the power generation element protrudes to the outside through a through hole formed in the case. ing.
The case includes, for example, a bottomed cylindrical storage portion whose one surface is open, and a lid portion that is formed in a flat plate shape and closes the opening surface of the storage portion, and the through hole through which the electrode terminal passes is the lid. It is formed in the part. The electrode terminal is coupled to the lid at a portion of a through hole through which the electrode terminal passes.
Between the electrode terminal and the through hole of the lid part to which the electrode terminal is coupled, the electrode terminal does not fall out, the insulation between them, and the connection part between the electrode terminal and the lid part. A sealing property is required so that the electrolyte filled in the case does not leak.

  In particular, in the case of a secondary battery, there is a change in internal pressure due to charging / discharging in the case, and the internal pressure may increase greatly when there is an abnormality such as when an internal short circuit occurs in the power generation element. Furthermore, in the secondary battery in which the case is configured by a can case, since the strength of the can case itself is large, a large force is applied to the coupling portion between the electrode terminal and the lid portion.

Therefore, the electrode terminal is connected to the lid portion by the following tangential structure.
That is, a burring portion that rises toward the outside of the case is formed at the peripheral portion of the through hole in the lid portion, and the electrode terminal is inserted into the through hole via an insulating member, and the burring portion in the through hole The electrode terminal and the lid portion are coupled by pressing the burring portion from the outside of the case and plastically deforming it with the annular member that restrains the burring portion from the outer peripheral side being fitted to the outer periphery of the case. ing.
The electrode terminal and the insulating member are caulked by the burring portion pressed in this way, and it is possible to secure a retaining property, an insulating property, a sealing property, and the like.

The connection between the electrode terminal and the lid portion by pressing the burring portion from the outside of the case and caulking the electrode terminal and the insulating member is specifically performed as shown in FIGS. Yes.
That is, a through-hole 133 is formed in the lid portion 132 of the case 130, and a burring portion 134 that rises outward from the case 130 is formed at the peripheral portion of the through-hole 133.

Then, as shown in FIG. 41, a fixing portion 143 positioned below the electrode terminal 140 is inserted into the through-hole 133 where the burring portion 134 is formed via the insulating member 150, and the outer periphery of the burring portion 134 is An annular member 135 that restrains the burring portion 134 from the outer peripheral side is fitted.
In addition, the electrode terminal 140 is inserted into the through hole 133 through the insulating member 150, and the lid portion 132 on the inner surface (lower surface in FIG. 41) side of the burring portion 134 in which the annular member 135 is fitted is disposed on the lid portion. A die 160 that contacts the inner surface of 132 and supports the lid portion 132 is disposed, and a punch 170 is disposed outside the case 130 (upward in FIG. 41) at a position where the electrode terminal 140 is inserted into the through hole 133.

Next, as shown in FIG. 42, the punch 170 is moved to the burring portion 134 side (downward), and the front end surface (upper end surface) of the burring portion 134 is pressed from the outside by the punch 170 and pressed. In this case, the punch 170 presses the inner peripheral side portion of the front end surface of the burring portion 134, and a part of the outer peripheral side of the front end surface of the burring portion 134 is not pressed.
When the burring part 134 is pressed, the inner peripheral surface of the burring part 134 bulges inward (insulating member 150 side), and as shown in FIG. 43, the insulating member 150 is bulged by the bulging part 134a bulging inward. And the electrode terminal 140 will be crimped.
In this manner, the electrode terminal 140 is crimped together with the insulating member 150 by pressing the burring portion 134, so that the electrode terminal 140 and the lid portion 132 are coupled while securing the retaining property, the insulating property, the sealing property, and the like. Has been.

  The electrode terminal and the lid portion of the case may be coupled to each other by inserting the electrode terminal into the cylindrical holding portion provided outward from the lid portion via an insulating resin, and the electrode terminal and the insulating lid portion. Patent Document 1 discloses a configuration in which the electrode terminal and the lid portion are coupled by caulking the holding portion in a state where the resin is inserted from the outer peripheral side.

JP 2005-302625 A

As described above, when the tip end surface of the burring portion is pressed from the outside of the case and the electrode terminal and the lid portion are coupled, the amount of bulging inside the burring portion is appropriate. The pressing amount (pressing stroke) for the burring portion of the punch is set.
However, since each member such as the electrode terminal, the insulating member, the burring portion, and the annular member has a dimensional tolerance, each member having an inner diameter or an outer diameter that is near the upper limit or lower limit of the tolerance is combined. If the gap between the members (for example, between the insulating member and the burring portion, between the burring portion and the annular member, or between the insulating member and the electrode terminal) becomes extremely small, The press load at the time of pressing may become too large.
In other words, when each member in the caulking portion is closely arranged and the gap between each member is small, the space for the pressed burring portion to bulge is also small, so the burring portion is the same stroke. Is pressed, the press load becomes large as compared with the case where the gap between the members is large.

Here, when the burring portion is pressed by the punch, the portion (inner peripheral side portion) where the punch in the burring portion abuts is pushed downward, but if the press load is appropriate, the outer peripheral side of the burring portion The portion is not pushed in and remains in the same position as before pressing (state shown in FIG. 43).
On the other hand, when the burring part is pressed with a punch when the press load is too large, the part (inner peripheral side part) where the punch contacts in the burring part is pushed downward and the outer peripheral part of the burring part also moves downward. (The state shown in FIG. 44). That is, in addition to the inner peripheral portion of the burring portion with which the punch abuts being plastically deformed by the pressing force of the punch and being recessed with respect to the outer peripheral portion, the burring portion is entirely pushed downward.

As described above, when the outer peripheral side portion is pushed downward in addition to the inner peripheral side portion of the burring portion, not only the inner peripheral surface of the burring portion bulges inward, but also an extra wall is formed at the lower portion of the burring portion. Will occur.
In addition, even if the outer peripheral side portion of the burring portion is not pushed downward, if the press load is excessive, a surplus exceeding the amount of bulging inward of the burring portion may occur in the lower portion of the burring portion. It becomes.
A die that supports the lid portion is in contact with the inner surface (lower surface) of the lid portion including the burring portion forming portion, an insulating member is in contact with the inner peripheral surface of the burring portion, and the outer peripheral surface of the burring portion is formed by an annular member. Since it is restrained, the surplus generated in the lower part of the burring part escapes to the outer peripheral side of the burring part through the lid part, and this causes distortion in the lid part.
If the lid part is distorted, when the case is formed by joining the storage part and the cover part, the sealing property of the joint part between the storage part and the cover part may be lowered, and the reliability of the battery may be reduced. It can contribute.

  Therefore, in the present invention, a battery manufacturing apparatus and manufacturing method that does not cause distortion in a case such as a lid even when the press load of the burring portion becomes excessively large and extra burring occurs in the burring portion. And a battery.

A battery manufacturing apparatus, a manufacturing method, and a battery for solving the above problems have the following characteristics.
That is, as described in claim 1, a case in which a power generation element is housed and a through-hole having a burring portion that rises outward is formed, and the case is connected to the power generation element and passes through the through-hole of the case. And an electrode member that is inserted into the through hole through an insulating member, and an annular member that restrains the burring portion from the outer peripheral side is fitted to the outer periphery of the burring portion in the through hole. A battery manufacturing apparatus in which the electrode terminal and the case are coupled by pressing the burring portion from the outside of the case and plastically deforming in a mounted state, including the burring portion forming portion. A die that contacts the inner surface of the case; and a punch that presses the burring portion from the outside of the case, wherein the die includes the burring portion A portion corresponding to formation portion comprises a excess thickness storage unit capable of storing the excess material resulting from the pressing of the burring portion by the punch.
As a result, when the press load on the burring part becomes excessive, the surplus material generated by pressing the burring part can be stored in the surplus storage means, and the case such as the lid is prevented from being distorted or deformed. it can.

Further, as described in claim 2, the surplus storage means is provided at a location corresponding to the burring portion forming portion of the die, and is movable in the rising direction of the burring portion, and the abutting piece. And an urging member that urges the case toward the inner surface side of the case.
As a result, the bulging part necessary for coupling the lid part and the electrode terminal is securely formed in the burring part, while the surplus generated by pressing the burring part is stored in the surplus storage means, and the case such as the lid part Can be prevented from being distorted or deformed.

According to a third aspect of the present invention, the surplus storage means is a recessed portion that is formed at a location corresponding to the burring portion forming portion of the die and opens to the inner surface side of the case.
Thereby, the surplus storage means can be easily provided in the die.

According to a fourth aspect of the present invention, in the contact surface of the punch with the burring portion, the portion located on the electrode terminal side protrudes toward the burring portion side than the portion located on the annular member side.
Thereby, during pressing, the burring portion is pressed to the outer peripheral side, and the frictional resistance between the outer peripheral surface of the burring portion and the inner peripheral surface of the annular member is increased, so that the burring portion is difficult to slide in the pressing direction, It is possible to reduce the surplus thickness generated in the burring portion and prevent the case such as the lid from being distorted or deformed.

Further, as described in claim 5, a case in which a power generation element is housed and a through hole having a burring portion rising outward is formed, and the case is connected to the power generation element and passes through the through hole of the case. And an electrode member that is inserted into the through hole through an insulating member, and an annular member that restrains the burring portion from the outer peripheral side is fitted to the outer periphery of the burring portion in the through hole. A battery manufacturing method in which the electrode terminal and the case are coupled by pressing the burring portion from the outside of the case and plastically deforming the burring portion when the burring portion is pressed. , The surplus generated in the burring portion by pressing is released in the pressing direction.
As a result, when the press load on the burring part becomes excessive, the surplus material generated by pressing the burring part can be stored in the surplus storage means, and the case such as the lid is prevented from being distorted or deformed. it can.

Further, as described in claim 6, surplus generated in the burring portion by the press is provided at a location corresponding to the burring portion forming portion in the die that supports the inner surface side of the case when pressing the burring portion, It escapes to the surplus storage means which has the contact piece which can move to the standing direction of the said burring part, and the urging member which urges | biases the said contact piece to the inner surface side of the said case.
As a result, the bulging part necessary for coupling the lid part and the electrode terminal is securely formed in the burring part, while the surplus generated by pressing the burring part is stored in the surplus storage means, and the case such as the lid part Can be prevented from being distorted or deformed.

In addition, as described in claim 7, the surplus generated in the burring portion by the pressing is formed in a die that supports the inner surface side of the case when the burring portion is pressed, and is a recessed portion that opens to the inner surface side of the case. To escape.
Thereby, the surplus storage means can be easily provided in the die.

The contact surface of the punch for pressing the burring portion with respect to the burring portion is such that the portion located on the electrode terminal side is more burring portion than the portion located on the annular member side. Protrudes to the side.
Thereby, during pressing, the burring portion is pressed to the outer peripheral side, and the frictional resistance between the outer peripheral surface of the burring portion and the inner peripheral surface of the annular member is increased, so that the burring portion is difficult to slide in the pressing direction, It is possible to reduce the surplus thickness generated in the burring portion and prevent the case such as the lid from being distorted or deformed.

Further, as described in claim 9, a case in which a power generation element is housed and a through-hole having a burring portion that rises outward is formed, and the case is connected to the power generation element and passes through the through-hole of the case. And an electrode member that is inserted into the through hole through an insulating member, and an annular member that restrains the burring portion from the outer peripheral side is fitted to the outer periphery of the burring portion in the through hole. In the mounted state, the burring portion is pressed from the outside of the case to be plastically deformed, whereby the electrode terminal and the case are connected to each other. , Projecting inward from the burring portion forming portion of the case.
Thereby, when pressing the burring part, it is possible to prevent a surplus generated in the burring part from flowing to the outer peripheral side of the burring part, and it is possible to configure a battery including a case such as a lid part without distortion or deformation.

Further, as described in claim 10, a groove is formed at the outer peripheral position of the burring portion in the case.
As a result, surplus material generated in the burring portion during pressing of the burring portion is absorbed by the groove, and a battery including a case such as a lid portion without distortion or deformation can be configured.

In addition, as described in claim 11, the frictional resistance generated between the outer peripheral surface of the burring portion and the annular member is larger than the frictional resistance generated between the inner peripheral surface of the burring portion and the insulating member.
Thereby, at the time of pressing the burring portion, the outer peripheral side portion of the burring portion can be prevented from sinking into the annular member, and the occurrence of surplus in the burring portion can be suppressed, and the lid portion without distortion or deformation, etc. A battery including the case can be configured.

The present invention has the following effects.
That is, according to the present invention, when the press load on the burring portion becomes excessive, it is possible to prevent the case such as the lid from being distorted or deformed.

It is side surface sectional drawing which shows a battery. It is a perspective sectional view showing a connecting part of a lid part of a case and an electrode terminal. It is side surface sectional drawing which shows the coupling | bond part of the cover part and electrode terminal of a case. It is an assembly exploded view which shows the coupling | bond part of the cover part and electrode terminal of a case. It is side surface sectional drawing which shows the press apparatus which presses the burring part of a cover part. It is a perspective view which shows the punch of a press apparatus. It is a top view which shows the range which the punch in the upper end surface of a burring part contacts. It is an assembly exploded view which shows the die | dye of a press apparatus. It is side surface sectional drawing which shows a mode that a punch descend | falls to the burring part side at the time of pressing of a burring part. It is side surface sectional drawing which shows a mode that a bulging part is formed in the burring part pressed by the punch. When the press load on the burring part becomes excessive, the float part of the die slides downward, and the surplus generated in the burring part enters into the space generated by sliding the float part downward. It is side surface sectional drawing. It is side surface sectional drawing which shows the die | dye provided with the die main body by which a ditch | groove is formed in the location corresponded to a burring part formation part. FIG. 13 is a side cross-sectional view showing a state in which surplus material generated in the burring portion enters and is absorbed into the concave groove of the die main body shown in FIG. 12 when the press load on the burring portion becomes excessive. It is side surface sectional drawing which shows the die | dye which formed the taper surface in the internal peripheral surface of the fitting hole formed in a die | dye main body. It is a top view which shows the cover part in which the groove | channel along the circumferential direction of this burring part is formed in the outer peripheral part of a burring part. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 15 when a groove | channel is formed in an arc-shaped concave groove. It is side surface sectional drawing which shows the state before pressing with the punch of the cover part in which a groove | channel is formed in the outer peripheral part of a burring part. It is side surface sectional drawing which shows a state when the cover part by which a groove | channel is formed in the outer peripheral part of a burring part is pressed by the punch. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 15 when a groove | channel is formed in a rectangular-shaped recessed groove. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 15 when a groove | channel is formed in a V-shaped concave groove. It is side surface sectional drawing which shows the cover part comprised by the notch groove in which the groove | channel formed in the outer peripheral part of a burring part was formed in the outer surface. It is a top view which shows the cover part by which the linear groove | channel extended along the longitudinal direction of a cover part is formed in the outer peripheral part of a burring part. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 22 when a groove | channel is formed in a circular-arc-shaped concave groove. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 22 when a groove | channel is formed in a rectangular concave groove. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 22 when a groove | channel is formed in a V-shaped concave groove. It is a top view which shows the 2nd Example of the cover part by which the groove | channel along the circumferential direction of this burring part is formed in the outer peripheral part of a burring part. (A) is AA sectional drawing of the cover part shown in FIG. 22, Comprising: It is a top view which shows the groove | channel formed in the circular arc-shaped ditch | groove, (b) is B-- of the cover part shown in FIG. It is B sectional drawing, Comprising: It is a top view which shows the groove | channel formed in the triple arc-shaped concave groove. It is a top view which shows the 3rd Example of the cover part by which the groove | channel along the circumferential direction of this burring part is formed in the outer peripheral part of a burring part. It is AA sectional drawing and BB sectional drawing of the cover part shown in FIG. 28 when a groove | channel is formed in a rectangular concave groove. It is side surface sectional drawing which shows the press part of the punch which comprised the contact surface with a burring part so that an inner peripheral side contact surface might protrude toward the burring part side rather than an outer peripheral side contact surface. It is side surface sectional drawing which shows the state which the inner peripheral side contact surface of the punch shown in FIG. 30 contacted the upper end surface of the burring part. FIG. 31 is a side cross-sectional view showing a state where the inner peripheral side contact surface and the outer peripheral side contact surface of the punch shown in FIG. 30 are in contact with the upper end surface of the burring portion and the burring portion is pressed. It is side surface sectional drawing which shows the burring part after pressing with the punch shown in FIG. It is a side cross-sectional view showing a press portion of a punch in which the inner peripheral contact surface is formed as a tapered surface that is inclined in a direction away from the burring portion as it goes from the inner peripheral side to the outer peripheral side, and the outer peripheral contact surface is configured in a horizontal plane. is there. It is side surface sectional drawing which shows the punch formed in the taper surface which inclines in the direction which leaves | separates from the burring part as the lower end surface of a press part goes to the outer peripheral side from an inner peripheral side entirely. It is side surface sectional drawing which shows the state by which the burring part is pressed by the punch shown in FIG. It is side surface sectional drawing which shows the burring part after pressing with the punch shown in FIG. The lid portion configured such that the frictional resistance generated between the outer peripheral surface of the burring portion and the inner peripheral surface of the annular member is larger than the frictional resistance generated between the inner peripheral surface of the burring portion and the outer peripheral surface of the insulating member. FIG. It is side surface sectional drawing which shows the state which is pressing the burring part of the cover part shown in FIG. 38 with the punch. It is side surface sectional drawing which shows the state after pressing the burring part of the cover part shown in FIG. 38 with the punch. It is side surface sectional drawing which shows the cover part by which the burring part is pressed by the conventional press apparatus provided with the punch and die | dye. It is side surface sectional drawing which shows a mode that the burring part of the cover part shown in FIG. 41 is pressed by a press apparatus. It is side surface sectional drawing which shows a mode after the burring part of the cover part shown in FIG. 41 was pressed by the press apparatus. It is side surface sectional drawing which shows the state after a press when the press load to the burring part of the cover part shown in FIG. 41 is too large.

  Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.

A battery 10 shown in FIG. 1 is a secondary battery such as a lithium ion secondary battery or a nickel metal hydride battery, and is configured to be chargeable / dischargeable.
The battery 10 is configured by housing the power generation element 20 in a case 30, and electrode terminals 40 and 40 are provided so as to protrude outward from the case 30.

  The power generation element 20 is obtained by impregnating an electrolytic solution into an electrode body formed by laminating or winding a positive electrode, a negative electrode, and a separator. The battery 10 functions as a secondary battery that can be charged and discharged by causing a chemical reaction in the power generation element 20 during charging and discharging (strictly speaking, movement of ions between the positive electrode and the negative electrode through the electrolytic solution occurs). To do.

The case 30 is an exterior member of the battery 10 having a storage portion 31 and a lid portion 32. The storage portion 31 is a bottomed cylindrical member having one open surface, and stores the power generation element 20 therein. The lid portion 32 is a flat plate member formed in a shape corresponding to the opening surface of the storage portion 31, and the opening of the storage portion 31 is formed by joining the peripheral portion of the lid portion 32 and the peripheral portion of the storage portion 31. The face is blocked.
The electrode terminals 40 and 40 are current collecting terminals configured as a positive electrode terminal or a negative electrode terminal, and are coupled to the lid portion 32 of the case 30 in a state of protruding outward from the outer peripheral portion of the case 30.
The electrode terminals 40 and 40 are electrically connected to the positive electrode or the negative electrode of the power generation element 20 via appropriate lead terminals or the like, and exchange of electric power between the inside and outside of the battery 10 via the electrode terminals 40 and 40. Is done. That is, the electrode terminals 40 and 40 are external terminals used as a path for electrical connection with the outside.
The battery 10 of this example is configured as a square battery in which the case 30 is formed in a bottomed rectangular tube shape, but is not limited thereto, and the case 30 is formed in a bottomed cylindrical shape. It is also possible to apply to a cylindrical battery.

Next, a coupling structure between the electrode terminal 40 and the lid portion 32 of the case 30 will be described.
As shown in FIGS. 2 and 3, a through hole 33 is formed in the lid portion 32 of the case 30, and an outer side of the case 30 (upward in FIGS. 2 and 3) at the peripheral edge of the through hole 33. A burring portion 34 is formed to rise toward the front.
The through-hole 33 is a hole that penetrates in the thickness direction of the lid portion 32 (vertical direction in FIGS. 2 and 3), and is formed in a size that allows the electrode terminal 40 to penetrate.

That is, the burring portion 34 is a protruding portion provided to protrude from the outer surface of the lid portion 32, and the through hole 33 is formed by the inner peripheral surface thereof.
Moreover, the burring part 34 which protrudes outward from the peripheral edge part of the through-hole 33 is formed by plastic working a part of the lid part 32 (a part around the part where the through-hole 33 is provided). It can be suitably formed by a deep drawing method, a fillet method or the like.
In the case of this example, the through holes 33 are formed at two locations on the lid portion 32.

The electrode terminal 40 is a round terminal formed in a substantially cylindrical shape, and includes a protruding portion 41, a large diameter portion 42, and a coupling portion 43.
The protruding portion 41 is a portion disposed at one end portion (the upper end portion in FIGS. 2 and 3) of the electrode terminal 40 and is a cylindrical portion protruding outward from the case 30. The protruding portion 41 is used as a coupling portion with an external device of the battery 10 (a power source, a device that uses the power of the battery 10, another battery, or the like).

The coupling portion 43 is a portion disposed at the other end portion of the electrode terminal 40 (the lower end portion in FIGS. 2 and 3), and is coupled to the lid portion 32 and the lead terminal connected to the power generation element 20. It is the column-shaped part connected to. The axial length of the coupling portion 43 is set sufficiently larger than the thickness of the lid portion 32 (length of the burring portion 34).
The coupling portion 43 is inserted into the through hole 33 (burring portion 34) of the lid portion 32 via the insulating member 50.

The large-diameter portion 42 is located between the protruding portion 41 and the coupling portion 43 and is disposed on the outer side of the outer surface of the lid portion 32, and has a larger diameter than the protruding portion 41 and the coupling portion 43. It is a cylindrical part to be formed.
The large diameter portion 42 is a portion having the maximum diameter in the electrode terminal 40, and the outer diameter thereof is set according to the inner diameter of the through hole 33 of the lid portion 32. For example, the outer diameter of the large-diameter portion 42 is set to be approximately the same as the inner diameter of the through hole 33 and approximately the same as the outer diameter of the insulating member 50.

The insulating member 50 is a member formed in a cylindrical shape and covers at least the outer periphery of the portion inserted into the through hole 33 (burring portion 34) in the coupling portion 43 of the electrode terminal 40.
The inner diameter of the insulating member 50 is formed substantially the same as the outer diameter of the coupling portion 43 of the electrode terminal 40, and the outer shape of the insulating member 50 is formed substantially the same as the inner diameter of the through hole 33 (burring portion 34).
The coupling portion 43 of the electrode terminal 40 is inserted into the through hole 33 (burring portion 34) with the insulating member 50 fitted therein, and the electrode terminal 40 inserted into the through hole 33 (burring portion 34) is The insulating member 50 is insulated from the lid portion 32.

On the outer periphery of the burring portion 34, an annular member 35 that is formed in an annular shape and is made of a metal material that is stronger than the constituent member of the lid portion 32 is fitted.
The annular member 35 is a reinforcing member for reinforcing the strength against an external force applied to the outer side in the radial direction of the burring part 34 by restraining the burring part 34 from the outer peripheral side by being fitted to the outer periphery of the burring part 34.
The inner diameter of the annular member 35 is formed substantially the same as the outer diameter of the burring portion 34. The length of the annular member 35 in the axial direction is set to be approximately the same as the projecting dimension of the burring portion 34 from the outer surface of the lid portion 32.

A bulging portion 34a bulging radially inward is formed on the inner peripheral surface of the burring portion 34, and the insulating member 50 is compressed radially inward by the bulging portion 34a.
As a result, the insulating member 50 comes into pressure contact with the outer peripheral burring portion 34 and the inner peripheral electrode terminal 40, and the electrode terminal 40 is coupled to the lid portion 32.
That is, the insulating member 50 is compressed and elastically deformed by the bulging portion 34a of the burring portion 34, and the insulating member 50 and the electrode terminal 40 are caulked, whereby the electrode terminal 40 and the lid portion 32 are prevented from being detached. Bonded while ensuring insulation and sealing.

The bulging portion 34a is formed by pressing the burring portion 34 from the outside of the case 30 (from the front end side to the base end side of the burring portion 34 rising toward the outside of the case 30). Yes.
Further, the annular member 35 is fitted on the outer periphery of the burring portion 34, but the annular member 35 is fitted and restrained on the outer periphery of the burring portion 34 so that the burring portion 34 is subjected to a force applied from the radially inner side. The deformation to the outer peripheral side can be prevented, and the connection between the electrode terminal 40 and the lid portion 32 in the burring portion 34 can be stably maintained over a long period of time.

Next, a method for coupling the electrode terminal 40 and the lid portion 32 that are coupled by the above-described coupling structure will be described.
When the electrode terminal 40 is coupled to the lid portion 32, first, as shown in FIG. 4, the insulating member 50 is fitted into the coupling portion 43 of the electrode terminal 40, and the coupling portion 43 in a state where the insulating member 50 is fitted. Is inserted into the through hole 33 (burring portion 34) of the lid portion 32. An annular member 35 is fitted on the outer periphery of the burring portion 34.

Then, with the annular member 35 fitted on the outer periphery of the burring portion 34 and the coupling portion 43 fitted with the insulating member 50 inserted into the through hole 33 (burring portion 34), the front end surface of the burring portion 34 (see FIG. 5 is pressed from the outside of the case 30.
As shown in FIG. 5, the pressing device that presses the burring portion 34 forms a part of a manufacturing apparatus that manufactures the battery 10, and includes an inner surface (the lower surface in FIG. 5) of the lid portion 32 that includes a portion where the burring portion 34 is formed. ) And the die 60 that supports the lid portion 32 and the burring portion 34 so that the burring portion 34 can be moved in a direction approaching and separating from the outer side of the case 30 (upper side in FIG. 5). And a punch 70 for pressing.

As shown in FIGS. 5 and 6, the punch 70 is disposed above the burring portion 34 (in the direction in which the burring portion 34 projects), and has a cylindrical press portion 70 a at the lower end thereof. The press part 70 a is formed in an annular shape whose lower surface matches the shape of the upper end surface of the burring part 34 of the lid part 32.
In other words, the lower surface of the press portion 70a is formed in an annular shape having substantially the same diameter as the upper end surface of the burring portion 34, and comes into contact with the inner peripheral side portion of the upper end surface of the burring portion 34 as shown in FIG. It is configured to be possible.

As shown in FIGS. 5 and 8, the die 60 includes a die main body 61 that generally contacts the inner surface of the lid portion 32, and a vertical direction with respect to the die main body 61 (the abutment of the die 61 against the lid portion 32. Float portion 62 that is slidably fitted in a direction perpendicular to the surface, that is, the protruding direction of burring portion 34, and serves as an abutment piece that abuts against the burring portion 34 forming portion of lid portion 32. And an urging spring 63 for urging the portion 32 side.
The float portion 62 is formed of a stepped annular member in which the outer diameter of the upper portion is formed to be smaller and the outer diameter of the lower portion is formed to be larger than the upper portion, and between the upper portion and the lower portion. A step 62a is provided. The inner diameter of the float portion 62 is formed to be substantially the same as the outer diameter of the insulating member 50.

A float 62 can be fitted into the die body 61, and a sliding hole 61a penetrating in the vertical direction is formed.
The sliding hole 61a is formed as a stepped hole in which the inner diameter of the upper part is formed to be smaller and the inner diameter of the lower part is formed to be larger than the upper part, and the step part 61b is formed between the upper part and the lower part. Have.
The inner diameter of the upper part of the sliding hole 61a is formed to be substantially the same as the outer diameter of the upper part of the float part 62, and the inner diameter of the lower part of the sliding hole 61a is formed to be substantially the same as the outer diameter of the lower part of the float part 62. Yes.
Further, the stepped portion 61b of the sliding hole 61a and the stepped portion 62a of the float portion 62 can be engaged.

The float part 62 fitted in the sliding hole 61 a is located below the burring part 34. That is, the float part 62 is disposed at a location corresponding to the part where the burring part 34 is formed in the die 60.
Further, the peripheral edge portion of the sliding hole 61a in the die body 61 is located at a position corresponding to the outer peripheral position of the burring portion 34 (a boundary portion between the burring portion 34 and the annular member 35), for example, in the radial direction of the sliding hole 61a. is doing.

The biasing spring 63 is a biasing member that biases the float portion 62 fitted in the sliding hole 61a upward (on the lid portion 32 side). The biasing spring 63 is configured by, for example, a compression coil spring, and the upper end thereof is in contact with the lower end surface of the float portion 62.
The float portion 62 fitted in the sliding hole 61a is biased upward by a biasing spring 63, and the step between the step portion 62a of the float portion 62 biased by the biasing spring 63 and the sliding hole 61a. The portion 61b is engaged, and the float portion 62 is restricted from sliding further upward. The upper end surface of the float portion 62 in a state where the step portion 62a and the step portion 61b are engaged is flush with the upper surface of the die body 61 (the upper end surface of the float portion 62 and the upper surface of the die body 61 are the same). Located at the height).
When the die 60 is in contact with the inner surface of the lid portion 32 and supports the lid portion 32, the float portion 62 is urged upward by a biasing spring 63 with a predetermined load.

The burring unit 34 is pressed by a press device including the die 60 and the punch 70 configured as described above.
When pressing the burring portion 34, as shown in FIG. 9, the punch 70 is disposed away from the burring portion 34 with the die 60 in contact with the inner surface of the lid portion 32 and supporting the lid portion 32. Is lowered to the burring portion 34 side.
The lower end of the punch 70 that is lowered and close to the burring portion 34 comes into contact with the upper end surface of the burring portion 34, and further descends to press the burring portion 34 from the outside of the case 30.

  As shown in FIG. 10, the burring portion 34 pressed by the punch 70 is supported by the die 60 at the lower side and the outer peripheral surface is restrained by the annular member 35, so that the inner peripheral surface bulges inward and expands. A protruding portion 34a is formed.

Here, in order to press the burring portion 34 with the punch 70 and to join the electrode terminal 40 and the lid portion 32 in a state where the sealing property or the like is maintained, the bulging portion 34a is formed when the burring portion 34 is pressed. It is necessary to form, and in order to form the bulging portion 34a, it is necessary to apply a predetermined press load to the burring portion 34.
Further, when the burring portion 34 is pressed by the punch 70, a load resulting from the press load is applied to the upper surface of the die 60 (the surface contacting the lid portion 32).
Accordingly, the float portion 62 fitted in the sliding hole 61a of the die 60 so as to be vertically slidable is downward when a pressing load necessary for forming the bulging portion 34a is applied to the burring portion 34. It is biased by a biasing spring 63 so as not to slide.
That is, the float portion 62 has a biasing force greater than the load applied to the float portion 62 due to the minimum press load applied to the burring portion 34 to form the bulging portion 34a. Is biased upward.

  On the other hand, since each member such as the electrode terminal 40, the insulating member 50, the burring portion 34, and the annular member 35 has a dimensional tolerance, the members having the inner and outer diameters near the upper limit or lower limit of the tolerance are combined. When the gap between each member (for example, between the insulating member 50 and the burring portion 34, between the burring portion 34 and the annular member 35, or between the insulating member 50 and the electrode terminal 40) becomes extremely small. Even if the burring portion 34 is pressed by lowering the punch 70 with the same stroke, the burring portion 34 is subjected to a load larger than the press load necessary for forming the bulging portion 34a. The press load applied to the surface may become excessive.

As described above, when the press load applied to the burring portion 34 by the punch 70 becomes excessively large, the burring portion 34 tries to be plastically deformed beyond the necessary amount for forming the bulging portion 34a, and the burring portion 34 is further annular. By sliding downward with respect to the member 35, surplus material is generated in the lower portion of the burring portion 34, and the load on the float portion 62 due to the press load also increases.
Further, when the press load becomes excessive in this way, the surplus material generated in the lower portion of the burring portion 34 escapes to the outer peripheral side of the burring portion 34 through the lid portion 32 and the lid portion 32 is distorted. .
Accordingly, when a press load is applied to the burring portion 34 so as to cause distortion in the lid portion 32 due to the generated surplus, the float portion 62 of the die 60 is configured to slide downward.
That is, the urging force of the float portion 62 by the urging spring 63 is set to be smaller than the load applied to the float portion 62 due to the press load that causes distortion in the lid portion 32.

Thus, the urging force of the float portion 62 by the urging spring 63 is less than the load applied to the float portion 62 due to the minimum press load required to form the bulging portion 34 a being applied to the burring portion 34. Is set to be larger than the load applied to the float portion 62 due to the press load that causes distortion in the lid portion 32.
The urging force of the float portion 62 by the urging spring 63 is F, and the load applied to the float portion 62 due to the minimum press load necessary for forming the bulging portion 34a being applied to the burring portion 34 is the lower limit load FL. When the load applied to the float portion 62 due to the press load that causes distortion in the lid portion 32 is the upper limit load FU, the urging force F is set to a value that satisfies the relationship shown in the following equation (1). .
FL <F <FU (1)
The lower limit load FL and the upper limit load FU can be set to, for example, 500 kg and 600 kg, respectively.

Accordingly, when the burring portion 34 is pressed by the press device of this example, if the downward load on the float portion 62 due to the press load becomes equal to or greater than the upper limit load FU, as shown in FIG. The portion 62 slides downward against the urging force of the urging spring 63 due to the load, and surplus material generated in the lower portion of the burring portion 34 enters the space generated by sliding the float portion 62 downward. Will be.
That is, when the press load on the burring portion 34 by the punch 70 becomes excessive, the float portion 62 moves downward, so that it is below the upper surface of the die main body 61 at a location corresponding to the burring portion 34 forming portion of the die 60. A space is formed at the position, and the surplus generated in the burring portion 34 is absorbed into the formed space, so that the surplus does not escape to the outer peripheral side of the burring portion 34 through the lid 32 and the lid 32. Can be prevented from being distorted or deformed.

Further, when the press load on the burring portion 34 is not excessive (when the press load on the float portion 62 is less than the upper limit load FU), the float portion 62 does not move downward. When this is not generated, no surplus is stored below the burring portion 34, and the bulging portion 34a necessary for coupling the lid portion 32 and the electrode terminal 40 can be reliably formed.
That is, while the bulging part 34a necessary for the coupling between the lid part 32 and the electrode terminal 40 is reliably formed in the burring part 34, the surplus material generated by the pressing of the burring part is accommodated in the surplus capacity accommodating means. It is possible to prevent distortion and deformation of the case.

Further, the surplus material generated in the burring part 34 enters the space generated by the downward movement of the float part 62, and the surplus material generated in the burring part 34 projects inward of the formation part of the burring part 34 in the lid part 32. Will be.
As a result, a step is formed between a portion located in the float portion 62 portion of the lid portion 32 and a portion located in the die body 61 portion, and the step is a step difference in the boundary portion between the die body 61 and the float portion 62. Therefore, it is possible to prevent surplus material generated in the burring portion 34 from flowing to the outer peripheral side of the burring portion 34, and to prevent distortion and deformation of the lid portion 32.

Further, in order to prevent the lid portion 32 from being distorted when the press load on the burring portion 34 becomes excessive and a surplus of the burring portion 34 is generated, the die 60 is configured as follows. You can also.
A die 60 shown in FIG. 12 has a die main body 65 that abuts on the inner surface of the lid portion 32 including the burring portion 34 forming portion. The die main body 65 is formed to have substantially the same diameter as the outer diameter of the insulating member 50. A fitting hole 65a into which the insulating member 50 can be fitted is formed.
Grooves 65b, 65b,... Are formed at locations corresponding to the burring portion 34 forming portion on the upper surface of the die body 65 (the contact surface with the lid portion 32).
A plurality of concave grooves 65b, 65b,... Are formed concentrically on the outer peripheral side of the peripheral edge of the fitting hole 65a, and the cross-sectional shape thereof is formed in a substantially rectangular shape.

When the burring portion 34 is pressed by the punch 70 in a state where the die 60 configured as described above is in contact with the inner surface of the lid portion 32 and the lid portion 32 is supported, the press load on the burring portion 34 becomes excessive. In this case, as shown in FIG. 13, surplus material generated in the burring portion 34 enters into the concave grooves 65 b, 65 b... Of the die main body 65 and is absorbed.
In this case, the concave grooves 65b, 65b,... Are formed in such a size that the total volume of the space formed by the concave grooves 65b, 65b,. Therefore, it is possible to absorb all the surplus generated in the burring portion 34.

Thereby, it is possible to prevent surplus material generated in the burring portion 34 from flowing to the outer peripheral side of the burring portion 34, and to prevent the lid portion 32 from being distorted.
Further, when surplus material generated in the burring portion 34 enters the concave grooves 65b, 65b,..., An anchor effect is generated between the lower surface of the lid portion 32 and the concave grooves 65b, 65b,. It is possible to prevent surplus thickness generated in the portion 34 from flowing to the outer peripheral side of the burring portion 34, and to prevent the lid portion 32 from being distorted or deformed.
Further, the concave grooves 65b, 65b... That serve as a space for storing surplus material can be configured simply by forming a groove in the die main body 65 by cutting or pressing. Means can be easily provided.
In addition, it is preferable to arrange | position the ditch | groove 65b * 65b ... in the die main body 65 in the downward position of the press part 70a of the punch 70 which presses the burring part 34. FIG.

The die 60 can be formed as follows.
A die 60 shown in FIG. 14 has a die main body 66 that abuts on the inner surface of the lid portion 32 including the burring portion 34 forming portion. The die main body 66 is formed to have substantially the same diameter as the outer diameter of the insulating member 50. A fitting hole 66a into which the insulating member 50 can be fitted is formed.
A tapered surface 66b that increases in diameter as it goes upward is formed at the upper peripheral edge of the fitting hole 66a, that is, the upper end of the inner peripheral surface of the fitting hole 66a.
In the die 60 configured as described above, the insulating member 50 is fitted in the fitting hole 66a, and is surrounded by the tapered surface 66b and the outer peripheral surface of the insulating member 50, and is opened on the upper surface side of the die body 66. A recessed portion 66c is formed.

When the burring portion 34 is pressed by the punch 70 in a state where the die 60 is in contact with the inner surface of the lid portion 32 and the lid portion 32 is supported, the press load on the burring portion 34 becomes excessive. The surplus generated in the burring portion 34 enters the recessed portion 66c and is absorbed.
In this case, the recess 66c is formed so that the volume of the space constituting the recess 66c is equal to or greater than the volume of the surplus volume generated in the burring portion 34. It is possible to absorb all meat.
In addition, it is preferable that the recessed part 66c comprised by the taper surface 66b of the die | dye main body 66 is arrange | positioned in the downward position of the press part 70a of the punch 70 which presses the burring part 34. FIG.

In this way, the die 60 is formed with a space such as a groove or a recessed portion opened on the contact surface of the die 60 with the lid portion 32 as a space for storing the surplus generated in the burring portion 34. Thus, even when the press load on the burring portion 34 is excessive, it is possible to absorb the surplus generated in the burring portion 34 and to prevent the lid portion 32 from being distorted or deformed. .
Note that the shape of the space for storing the surplus of the burring portion 34 formed in the die 60 is not limited to the above-described shape. That is, other shapes such as a V-groove shape and a U-groove shape may be used as long as the surplus generated in the burring portion 34 can be absorbed when the press load on the burring portion 34 becomes excessive.

Further, when the press load on the burring portion 34 by the punch 70 becomes excessive, the lid portion 32 of the battery 10 is prevented from being distorted or deformed in the lid portion 32 due to the surplus material generated in the burring portion 34. Can be configured as follows.
In the lid portion 32 shown in FIG. 15, grooves 36 a and 36 b along the circumferential direction of the burring portion 34 are formed on the outer peripheral portion of the burring portion 34.

The groove 36 a is disposed at a position in the short direction of the lid portion 32 on the outer peripheral portion of the burring portion 34, and the groove 36 b is disposed at a position in the longitudinal direction of the lid portion 32 on the outer peripheral portion of the burring portion 34. .
As shown in FIG. 16A, the groove 36a is formed in, for example, an arc-shaped concave groove protruding inward of the case 30, and as shown in FIG. 16B, the groove 36b is formed in, for example, the case. 30 is formed in an arc-shaped convex groove protruding outward.

Thus, by forming the grooves 36a and 36b in the outer peripheral portion of the burring portion 34 in the lid portion 32, as shown in FIG. 17, when the burring portion 34 is pressed by the punch 70, the burring portion 34 is generated. It is possible to absorb surplus meat.
That is, as shown in FIG. 18, the surplus generated in the burring portion 34 due to the pressing of the burring portion 34 tends to flow to the outer peripheral side of the burring portion 34 through the lid portion 32. However, the surplus that tends to flow to the outer peripheral side is absorbed, for example, by deforming the grooves 36a and 36b disposed in the outer peripheral portion of the burring portion 34 so that the grooves 36a and 36b are filled, and the outer periphery is further increased. Since it does not flow to the side, it is possible to prevent the lid portion 32 from being distorted or deformed.

Further, as shown in FIG. 19A, the groove 36 a is formed in a rectangular concave groove protruding inward of the case 30, and as shown in FIG. 19B, the groove 36 b is formed on the case 30. It can also be formed in a rectangular convex groove protruding outward.
Further, as shown in FIG. 20 (a), the groove 36a is formed in a V-shaped concave groove protruding inward of the case 30, and as shown in FIG. 19 (b), the groove 36b is formed in the case 30. It can also be formed in a V-shaped convex groove protruding outward.
In this example, the groove 36a is formed as a concave groove protruding inward of the case 30, but may be formed as a convex groove protruding outward of the case 30, and the groove 36b is formed in the case 30b. Although it is formed in a convex groove protruding outward of 30, it can also be formed in a concave groove protruding inward of case 30.

The grooves 36a and 36b described in the present example are configured by bending the plate-like member constituting the lid portion 32 inwardly or outwardly in the thickness direction to form concave grooves and convex grooves. However, it is not limited to this.
For example, as shown in FIG. 21, the grooves 36a and 36b can be formed by forming notched grooves on the outer surface or the inner surface (FIG. 21 shows the case where the notched grooves are formed on the outer surface). The shape of the cutout groove can be formed in a V shape, a U shape (arc shape), a rectangular shape, or the like.
In addition, the grooves 36a and 36b may be formed so that the volume of the space formed by the notch groove or the like is large enough to absorb the surplus amount generated in the burring portion 34.

Further, as shown in FIG. 22, the grooves 36a and 36b may be configured by linear grooves extending along the longitudinal direction.
In the case of this example, one groove 36 a is formed at each position in the lateral direction of the lid portion 32 on the outer peripheral portion of the burring portion 34, and one groove 36 b is formed on the outer peripheral portion of the burring portion 34. Three each is formed at each longitudinal position, but the number is not limited to this, and the number of grooves 36a and 36b can be appropriately formed.

As shown in FIG. 23 (a), the groove 36a of this example can also be formed in, for example, an arcuate concave groove protruding inward of the case 30, and as shown in FIG. The groove 36b can also be formed in, for example, an arc-shaped convex groove protruding outward from the case 30.
Further, as shown in FIGS. 24 (a) and 24 (b), the grooves 36a and 36b are rectangular concave grooves projecting inward of the case 30 and rectangular shapes projecting outward of the case 30, respectively. It can also be formed in a convex groove.
Further, as shown in FIGS. 25A and 25B, the grooves 36 a and 36 b are V-shaped concave grooves projecting inward of the case 30 and V projecting outward of the case 30, respectively. It can also be formed in a letter-shaped convex groove.

In this example, the groove 36a is formed as a concave groove protruding inward of the case 30, but may be formed as a convex groove protruding outward of the case 30, and the groove 36b is formed in the case 30b. Although it is formed in a convex groove protruding outward of 30, it can also be formed in a concave groove protruding inward of case 30.
As described above, by forming the grooves 36a and 36b by linear grooves extending in the longitudinal direction, the surplus generated in the burring portion 34 is absorbed, and the lid portion 32 is not distorted or deformed. It can be prevented from occurring.

The grooves 36a and 36b can also be configured as follows.
That is, in the lid portion 32 shown in FIGS. 26 and 27, grooves 36 a and 36 b along the circumferential direction of the burring portion 34 are formed on the outer peripheral portion of the burring portion 34.
The groove 36 a is formed as an arc-shaped concave groove that protrudes inward of the case 30, for example. The groove 36 b is formed as a triple arc-shaped concave groove that protrudes outward of the case 30, for example. .

Furthermore, the grooves 36a and 36b can be configured as follows.
That is, in the lid portion 32 shown in FIGS. 28 and 29, grooves 36 a and 36 b along the circumferential direction of the burring portion 34 are formed in the outer peripheral portion of the burring portion 34.
The groove 36 a is formed as a rectangular groove that protrudes inward of the case 30, for example, and the groove 36 b is formed as a rectangular groove that protrudes outward of the case 30, for example.
In this case, the groove 36 b is formed wide in the longitudinal direction of the lid portion 32. That is, the width dimension of the groove 36b (dimension in the longitudinal direction of the lid portion 32) is formed larger than the width dimension of the groove 36a (dimension in the lateral direction of the lid portion 32).

As described above, by forming the grooves 36a and 36b in the outer peripheral portion of the burring portion 34 in the lid portion 32, the surplus generated in the burring portion 34 is absorbed, and the lid portion 32 is prevented from being distorted or deformed. Can
An electrode terminal using a press device having a die 60 and a punch 70 provided with a means for accommodating the surplus of the burring portion 34 as described above with respect to the lid portion 32 having such grooves 36a and 36b. By coupling 40, it is possible to more reliably absorb the surplus generated in the burring portion 34 and prevent the lid portion 32 from being distorted or deformed.

  In addition, when the burring portion 34 is pressed by a press device including the die 60 and the punch 70 to join the electrode terminal 40 and the lid portion 32, it is possible to prevent the lid portion 32 from being distorted or deformed. This can also be realized by configuring the pressing device as follows.

  For example, as shown in FIG. 30, the contact surface (lower end surface) of the press portion 70 a of the punch 70 with the burring portion 34 is a portion located on the electrode terminal 40 side. By being configured to protrude toward the burring portion 34 from the outer peripheral contact surface 70c, which is a portion located on the member 35 side, it is possible to prevent the lid portion 32 from being distorted or deformed.

The contact surface of the punch 70 with the burring portion 34 in the press portion 70a is such that the inner peripheral contact surface 70b protrudes more toward the burring portion 34 than the outer peripheral contact surface 70c, and the inner peripheral contact surface 70b. It is comprised in the level | step difference surface in which a level | step difference is formed in the boundary part with the outer peripheral side contact surface 70c.
The inner peripheral contact surface 70b is configured in a horizontal plane (a surface in a direction perpendicular to the pressing direction of the punch 70 with respect to the burring portion 34), and the outer peripheral contact surface 70c increases from the inner peripheral side to the outer peripheral side. It is formed in the taper surface which inclines in the direction away from.
The die 60 in the press device includes a die body 67 that abuts on the inner surface of the lid portion 32 including the burring portion 34 forming portion.

When the punch 70 configured as described above is lowered to the burring portion 34 side, as shown in FIG. 31, first, the inner peripheral contact surface 70b on the inner peripheral side contacts the upper end surface of the burring portion 34, The inner peripheral side portion of the upper end surface is pressed.
When the inner peripheral contact surface 70b of the press portion 70a of the punch 70 presses the upper end surface of the burring portion 34 and enters the inner peripheral portion of the burring portion 34 from the upper end surface, the outer peripheral surface of the burring portion 34 becomes the outer periphery. When pressed to the side, the surface pressure applied between the outer peripheral surface of the burring portion 34 and the inner peripheral surface of the annular member 35 increases.
In this case, with the inner peripheral contact surface 70b of the press part 70a entering and engaging with the burring part 34, the press part 70a is pressed toward the outer peripheral side of the burring part 34 to form an annular shape with the burring part 34. The surface pressure with the member 35 can be kept higher.

Thereafter, when the punch 70 is further lowered, as shown in FIG. 32, both the inner peripheral contact surface 70b and the outer peripheral contact surface 70c contact the burring portion 34 to press the burring portion 34 and bulge out. A portion 34a is formed.
In this case, the pressing by the punch 70 is performed while maintaining the pressing of the pressing portion 70a on the outer peripheral side of the burring portion 34 while maintaining a high surface pressure between the burring portion 34 and the annular member 35.
Further, since the outer peripheral contact surface 70c is formed as a tapered surface that is inclined in a direction away from the burring portion 34 toward the outer peripheral side, the burring portion 34 can be further pressed to the outer peripheral side during pressing. It has become.

As described above, since the burring portion 34 is pressed to the outer peripheral side during pressing, the frictional resistance between the outer peripheral surface of the burring portion 34 and the inner peripheral surface of the annular member 35 becomes higher than that in the normal state. It becomes difficult for the portion 34 to slide in the pressing direction of the punch 70.
Therefore, even when the press load on the burring portion 34 by the punch 70 becomes excessive, it is possible to prevent the outer peripheral side portion of the burring portion 34 from sliding in the pressing direction of the punch 70 (see FIG. The outer peripheral surface of the portion 34 does not slide downward with respect to the inner peripheral surface of the annular member 35), and the surplus thickness generated in the burring portion 34 is reduced so that the lid portion 32 is not distorted or deformed. It can be prevented from occurring.

Further, as shown in FIG. 34, the inner peripheral contact surface 70b and the outer peripheral contact surface 70c of the press portion 70a of the punch 70 are burring as the inner peripheral contact surface 70b moves from the inner peripheral side to the outer peripheral side. It is also possible to form a tapered surface inclined in a direction away from the portion 34 and to configure the outer peripheral contact surface 70c in a horizontal plane.
Even in this configuration, when the inner peripheral side contact surface 70b first contacts the burring portion 34 during pressing by the punch 70, the burring portion 34 is formed by the inner peripheral side contact surface 70b formed on the tapered surface. Can be pressed to the outer peripheral side, and also when the burring portion 34 is pressed by the inner peripheral contact surface 70b and the outer peripheral contact surface 70c, the pressing state to the outer peripheral side of the burring portion 34 is maintained. be able to.
Therefore, the surface pressure between the burring portion 34 and the annular member 35 can be increased without pressing the press portion 70a toward the outer peripheral side of the burring portion 34 during pressing.

Further, as shown in FIG. 35, the lower end surface of the press portion 70a in the punch 70 is entirely formed as a tapered surface 70d that inclines in a direction away from the burring portion 34 from the inner peripheral side to the outer peripheral side. As shown in FIG. 36, the burring portion 34 is pressed to the outer peripheral side by the tapered surface 70d at the time of pressing to increase the frictional resistance between the burring portion 34 and the annular member 35, and the press load on the burring portion 34 is excessive. Even if it becomes, it can suppress that the outer peripheral side part of the burring part 34 slides to a press direction.
That is, as shown in FIG. 37, even when the press load on the burring portion 34 becomes excessive, the outer peripheral side portion of the burring portion 34 does not sink into the annular member 35 after pressing, and the outer peripheral side of the burring portion 34 The upper end surface of the portion and the upper end surface of the annular member 35 can be in the same height position, and distortion and deformation of the lid portion 32 can be prevented.

  Further, in order to prevent the outer peripheral portion of the burring portion 34 from sinking into the annular member 35 when the press load on the burring portion 34 becomes excessive, the outer peripheral surface of the burring portion 34 and the annular member 35 are prevented. As a configuration for increasing the frictional resistance with the inner peripheral surface, the following configuration can be employed.

For example, as shown in FIG. 38, surface roughening or the like is applied to at least one of the outer peripheral surface of the burring portion 34 and the inner peripheral surface of the annular member 35, so The frictional resistance generated between the inner peripheral surface of the burring part 34 and the outer peripheral surface of the insulating member 50 can be configured to be larger than the frictional resistance generated between the peripheral surface and the peripheral surface.
The press device in this example includes, for example, a punch 70 in which the lower end surface of the press portion 70a is formed in a generally horizontal plane, and a die 60 having a die body 67 that abuts on the inner surface of the lid portion 32 including the burring portion 34 forming portion. It has.

  As shown in FIG. 39, when the punch 70 is lowered and pressed against the burring portion 34 configured as described above, the frictional resistance between the burring portion 34 and the annular member 35 is insulated from the burring portion 34. Since it is larger than the frictional resistance with the member 50, the outer peripheral side portion of the burring portion 34 does not slide in the pressing direction, and only the inner peripheral side portion of the burring portion 34 slides in the pressing direction and is plastically deformed, toward the inner peripheral side. The bulging part 34a which bulges is formed.

  In particular, since the frictional resistance between the burring portion 34 and the annular member 35 is increased by performing surface roughening or the like as compared with the case where no processing is performed, the press load on the burring portion 34 is increased. Even if it becomes excessive, as shown in FIG. 40, the outer peripheral side portion of the burring portion 34 does not sink into the annular member 35 after pressing, and the upper end surface and the annular member in the outer peripheral side portion of the burring portion 34 The upper end surface of 35 can be located at the same height position, and distortion or deformation of the lid portion 32 can be prevented.

In addition, although the process which increases the frictional resistance between the burring part 34 and the annular member 35, such as surface roughening, can be applied to either the burring part 34 or the annular member 35, for example, the burring part 34 is provided. When it comprises with an aluminum member and the annular member 35 is comprised with steel materials, it is preferable to perform the process which increases frictional resistance with respect to the annular member 35 which has high hardness.
Further, as a process for increasing the frictional resistance, in addition to surface roughening, a plurality of concave grooves extending in the circumferential direction are formed on at least one of the inner peripheral surface of the annular member 35 and the outer peripheral surface of the burring portion 34. It is also possible to form.

As an arrangement for preventing the outer peripheral portion of the burring portion 34 from sinking into the annular member 35 when the press load on the burring portion 34 becomes excessive, the outer peripheral surface of the burring portion 34 and the annular member 35 are prevented. The configuration in which the frictional resistance with the inner peripheral surface of the punch 70 is increased, and the inner peripheral contact surface 70b of the press portion 70a of the punch 70 described above protrudes toward the burring portion 34 from the outer peripheral contact surface 70c. It can also be set as the structure which combined the formed structure.
Thereby, it can prevent reliably that the outer peripheral side part of the burring part 34 sinks with respect to the annular member 35, and it can prevent that distortion and a deformation | transformation arise in the cover part 32. FIG.

Furthermore, the structure which prevents the outer peripheral side part of such a burring part 34 sinking with respect to the annular member 35, and the structure for absorbing the surplus generated in the burring part 34 as described above are combined. It can also be configured.
Even with this configuration, it is possible to prevent the lid portion 32 from being distorted or deformed when the press load on the burring portion 34 becomes excessive.

DESCRIPTION OF SYMBOLS 10 Battery 20 Power generation element 30 Case 31 Storage part 32 Cover part 33 Through-hole 34 Burring part 35 Ring member 40 Electrode terminal 43 Coupling part 50 Insulation member 60 Die 61 Die body 62 Float part 63 Biasing spring 70 Punch 70a Press part

Claims (11)

A case in which a power generation element is housed and a through hole having a burring portion that rises outward is formed, and an electrode terminal that is connected to the power generation element and protrudes to the outside of the case through the through hole of the case Prepared,
The electrode terminal is inserted into the through-hole through an insulating member, and the burring portion is attached to an outer periphery of the burring portion in the through-hole with an annular member that restrains the burring portion from the outer peripheral side. A battery manufacturing apparatus in which the electrode terminal and the case are coupled by pressing from outside and plastically deforming,
A die that contacts the inner surface of the case including the burring portion forming portion;
A punch for pressing the burring portion from the outside of the case;
The die includes surplus storage means capable of storing surplus generated by pressing the burring portion by the punch at a location corresponding to the burring portion forming portion.
A battery manufacturing apparatus. The surplus storage means is provided at a location corresponding to a burring portion forming portion of the die, and a contact piece movable in a rising direction of the burring portion;
A biasing member that biases the contact piece toward the inner surface of the case;
The battery manufacturing apparatus according to claim 1. The surplus storage means is a recessed portion that is formed at a location corresponding to a burring portion forming portion of the die and opens to the inner surface side of the case.
The battery manufacturing apparatus according to claim 1. The contact surface of the punch with the burring portion is such that the portion located on the electrode terminal side protrudes toward the burring portion side than the portion located on the annular member side.
The apparatus for manufacturing a battery according to any one of claims 1 to 3, wherein A case in which a power generation element is housed and a through hole having a burring portion that rises outward is formed, and an electrode terminal that is connected to the power generation element and protrudes to the outside of the case through the through hole of the case Prepared,
The electrode terminal is inserted into the through-hole through an insulating member, and the burring portion is attached to an outer periphery of the burring portion in the through-hole with an annular member that restrains the burring portion from the outer peripheral side. A method of manufacturing a battery in which the electrode terminal and the case are coupled by pressing from outside and plastically deforming,
When pressing the burring part, the excess generated in the burring part by the press is released in the pressing direction.
A battery manufacturing method characterized by the above. The surplus produced in the burring part by the press,
A contact piece that is provided at a location corresponding to a burring portion forming portion in a die that supports the inner surface side of the case when the burring portion is pressed, and the contact piece is movable in the rising direction of the burring portion, and the contact piece is Escape to surplus storage means having a biasing member biasing to the inner surface side of the case,
The method for producing a battery according to claim 5. The surplus produced in the burring part by the press,
Formed in a die that supports the inner surface side of the case during pressing of the burring portion, and escapes to a recessed portion that opens to the inner surface side of the case.
The method for producing a battery according to claim 5. The part of the contact surface of the punch that presses the burring part to the burring part projects closer to the burring part than the part located on the electrode member side,
The method for producing a battery according to any one of claims 5 to 7, wherein: A case in which a power generation element is housed and a through hole having a burring portion that rises outward is formed, and an electrode terminal that is connected to the power generation element and protrudes to the outside of the case through the through hole of the case Prepared,
The electrode terminal is inserted into the through-hole through an insulating member, and the burring portion is attached to an outer periphery of the burring portion in the through-hole with an annular member that restrains the burring portion from the outer peripheral side. A battery in which the electrode terminal and the case are coupled by pressing from outside and plastically deforming,
The surplus generated in the burring part by the press protrudes inward of the burring part forming part in the case,
Batteries characterized by A groove is formed at the outer peripheral position of the burring portion in the case,
The battery according to claim 9. The frictional resistance generated between the outer peripheral surface of the burring portion and the annular member is
Greater than the frictional resistance generated between the inner peripheral surface of the burring portion and the insulating member,
The battery according to claim 9 or 10, characterized in that

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