JP5626181B2 - Sealed battery and method for manufacturing the same - Google Patents

Description

  The present invention relates to a sealed battery and a manufacturing method thereof.

  Patent Document 1 discloses a configuration of a sealed battery in which an internal terminal extending outward from the inside of a battery case and an external terminal provided outside the case are connected by rivet caulking. In this configuration, an annular seal member is disposed between the battery case and the internal terminal, and the load applied to the seal member during caulking to the internal terminal is made equal to improve the sealing performance.

JP 2010-282848 A

  When the battery is used, the external terminal is connected to another battery or an external device (hereinafter referred to as “external device etc.”). External force is applied to the external terminals due to vibrations when connecting to or using external devices. This invention makes it a subject to provide the sealed battery which improved the tolerance with respect to the external force to such an external terminal.

The sealed battery according to the present invention includes an internal terminal having a rivet extending from the inside of the case to the outside, and an external terminal that is connected to the internal terminal by caulking the rivet of the internal terminal and that can be connected to the external electrode. And a sealing member that seals between the case and the internal terminal and the external terminal, and a caulking portion formed by caulking a rivet of the internal terminal includes an external electrode of the external terminal Since the caulking load of the connection side portion of the external terminal is caulked so as to be larger than the other portions, the compression rate of the seal member becomes larger than the other portions at the connection side portion of the external terminal with the external electrode. Formed as follows.

  The caulking portion is preferably formed so as to extend to a connection side of the external terminal with the external electrode and to have a rivet diameter of the portion larger than other portions.

  Another embodiment of the sealed battery according to the present invention is connected to the internal terminal by caulking the internal terminal having a rivet extending from the inside of the case to the outside, and the external terminal. An external terminal connectable to the case, and a sealing member that seals between the case, the internal terminal, and the external terminal, and a caulking portion formed by caulking a rivet of the internal terminal The terminal extends to the connection side with the external electrode, and is formed so that the rivet diameter of the part is larger than that of the other part.

  In a preferred embodiment of the sealed battery according to the present invention, the external terminal includes a metal terminal connected to a rivet of the internal terminal, and an external connection terminal connected to the external electrode, and the metal terminal is A fixed piece to which a rivet of the internal terminal is fixed; a connection piece that is bent from the fixed piece and continuous; a connection piece that extends in a direction away from the case; and a bent piece from the connection piece. And a terminal piece through which the external connection terminal passes.

  The method for manufacturing a sealed battery according to the present invention includes an internal terminal having a rivet extending from the inside of the case to the outside, and a rivet of the internal terminal connected to the internal terminal and connected to the external electrode. A method of manufacturing a sealed battery comprising: a possible external terminal; and a sealing member that seals between the case, the internal terminal, and the external terminal, wherein a rivet of the internal terminal is caulked to form a caulking portion In the forming step, the caulking portion is connected to the external electrode of the external terminal by increasing the caulking load of the portion on the side where the external electrode is connected to the external terminal in the caulking portion, compared to the other portion. The compression member is formed so that the compression rate of the seal member is larger than that of other portions on the connection side.

  The caulking portion is preferably formed so as to extend to a connection side of the external terminal with the external electrode and to have a rivet diameter of the portion larger than other portions.

  ADVANTAGE OF THE INVENTION According to this invention, the tolerance with respect to the external force from the outside to an external terminal can be improved, and the sealing performance of the rivet caulking part at the time of battery use can be improved.

It is a figure which shows a sealed battery. It is an enlarged view which shows the connection part of a current collection terminal and an external terminal. It is a figure which shows the rivet crimping of the rivet of a current collection terminal and an external terminal. It is a figure which shows the caulking part formed by rivet caulking. It is a figure which shows another embodiment of the rivet caulking of the rivet of a current collection terminal and an external terminal. It is a top view which shows another embodiment of the rivet caulking of the rivet of a current collection terminal and an external terminal. It is a top view which shows other embodiment of the rivet caulking of the rivet of a current collection terminal, and an external terminal.

The sealed battery 1 will be described with reference to FIGS. 1 and 2.
In the sealed battery 1, the electrode body 3 and the electrolyte solution 4 are accommodated in the case 2, and each current collecting terminal 10 that is an internal terminal connected to the positive electrode and the negative electrode of the electrode body 3, and each external terminal of the positive electrode and the negative electrode 20 are connected by rivet caulking.

The case 2 includes a box-shaped main body 2a that accommodates the electrode body 3 and the electrolyte solution 4, and a plate-shaped lid 2b that closes an opening portion of the main body 2a. The lid 2b has a through hole 2c through which the rivet 11 of each current collecting terminal 10 can pass, and the rivet 11 extends out of the case 2 through the through hole 2c.
Inside the case 2, a gasket 30 is disposed between the lid 2 b and each current collecting terminal 10. Further, an insulating member 40 is disposed between the lid 2 b and each external terminal 20 outside the case 2.

The gasket 30 is a member that seals between the lid 2b and the current collecting terminal 10 to ensure sealing and insulating properties. The rivet 11 of the current collecting terminal 10 passes through the gasket 30 and reaches the through hole 2c of the lid 2b.
The insulating member 40 is a member for ensuring insulation between the lid 2 b and the external terminal 20. Further, the insulating member 40 ensures insulation between the through hole 2c of the lid 2b and the rivet 11 of the current collecting terminal 10. On the upper surface side of the insulating member 40, that is, outside the case 2, the current collecting terminal 10 and the external terminal 20 are fixed by rivet caulking. The rivet 11 of the current collecting terminal 10 passes through the insulating member 40 and the external terminal 20 and is exposed to the outside of the case 2.

  As shown in FIG. 2, the rivet 11 of the current collecting terminal 10 is caulked in a state where the rivet 11 extends outside the case 2 through the gasket 30, the through hole 2 c, the insulating member 40, and the external terminal 20. As a result, a caulking portion 12 is formed at the tip of the rivet 11, the current collecting terminal 10 and the external terminal 20 are electrically connected, and the current collecting terminal 10 and the external terminal 20 are fixed to the lid 2b. .

  As shown in FIG. 2, the external terminal 20 includes a metal terminal 21 connected to the rivet 11 and a bolt 22 protruding from the metal terminal 21. The metal terminal 21 is a plate-like member bent in a crank shape, and is configured in a substantially Z shape in a side view.

One side of the metal terminal 21 is fixed to the lid 2 b via the insulating member 40 by the caulking portion 12 of the rivet 11. The metal terminal 21 is bent toward the outside of the case 2 from one side to the other side (in a direction away from the lid 2b), and further extended in a direction away from the rivet 11. Then, the bolt 22 is fixed to the other side of the metal terminal 21 in a penetrating manner. In this way, the bolt 22 is fixed in an offset state with respect to the rivet 11 via the metal terminal 21.
More specifically, the metal terminal 21 includes a fixing piece 21a fixed to the lid 2b by the caulking portion 12 via the insulating member 40, a portion continuous to the fixing piece 21a in the bending direction, and a portion continuous to the fixing piece 21a. A connection piece 21b extending in a direction away from the terminal, and a terminal piece 21c extending in a direction away from the fixed piece 21a along the plate surface of the lid 2b and continuing to the connection piece 21b in the bending direction, and through which the bolt 22 passes. .

  The bolt 22 is fixed so that the external thread portion 22 a protrudes toward the outside of the case 2, and the head portion 22 b is disposed inside the insulating member 40. When the sealed battery 1 is used, an external electrode for connecting to an external device such as a bus bar is inserted into the male threaded portion 22a of the bolt 22 and is fastened with a nut or the like. Electrically connects the inside and outside of the machine.

With reference to FIG.3 and FIG.4, the caulking process of the current collection terminal 10 to the rivet 11 is demonstrated.
As shown in FIG. 3A, in the state before caulking, the rivet 11 has a shape extending linearly in the axial direction. The rivet 11 passes through the gasket 30, the through hole 2 c of the lid 2 b, the insulating member 40, and the metal terminal 21 of the external terminal 20, and is fixed by a jig or the like in a state of protruding to the outside of the case 2 (lid 2 b).
As shown in FIG. 3B, the tip of the rivet 11 is caulked with a caulking tool 50, and the portion of the rivet 11 that protrudes from the surface of the metal terminal 21 is deformed to form the caulking portion 12. In the present embodiment, an example in which a rotary caulking tool is used as the caulking tool 50 is shown.

  At this time, as shown in FIG. 4, the compression ratio of the gasket 30 on the side where the bolt 22 of the caulking portion 12 is arranged, that is, the side where the external terminal 20 is connected to the outside (the region A on the right side in the drawing) is opposite. It crimps so that it may become larger than the compression rate of the side (area | region B on the left side of illustration). That is, the size of the lower surface of the caulking portion 12 in the region A and the upper surface of the current collecting terminal 10 is caulked so as to be smaller than that in the region B.

In other words, the caulking process is performed on the side of the rivet 11 on which the bolt 22 is disposed so that the caulking load by the caulking tool 50 is larger or the caulking amount is larger than on the opposite side. The
For example, when a rotary caulking tool is used as the caulking tool 50, the caulking load is increased at the site corresponding to the region A, or the rotation is terminated at the site corresponding to the region A, etc. Can be adopted. In addition, when a press caulking tool is used as the caulking tool 50, after pressing the entire rivet 11 and caulking, only a portion corresponding to the region A is partially pressed using another press tool. A method of increasing the amount of caulking of such a part can be adopted.

As described above, in the present embodiment, the caulking fastening force is increased on the side where the bolts 22 connected to the external electrodes (such as bus bars) are arranged, instead of performing the caulking uniformly over the entire circumference of the rivet 11. The caulking process is performed so that the compression rate of the gasket 30 on the external connection side is larger than the other parts.
As a result, when a large fastening force (axial force) is generated when connecting the external electrode to the bolt 22, the bolt 22 is also applied when an external force due to vibration is generated in the bolt 22 when the sealed battery 1 is used. Since the caulking fastening force of the caulking portion 12 on the side to be arranged is large, the caulking portion 12 can be prevented from lifting. Even when an external force more than expected is applied to the bolt 22 and a part of the caulking portion 12 is lifted, the compression ratio of the gasket 30 on the bolt 22 side can be increased in advance to maintain a compression ratio higher than a certain level. .
Therefore, resistance to external force applied to the external terminal 20 can be improved, and deterioration of the sealing performance related to rivet caulking can be suppressed.

  In the above embodiment, the configuration in which the caulking amount of the caulking portion 12 is distributed to increase the caulking fastening force on the external connection side by providing the distribution of the compression ratio of the gasket 30 has been described. As shown in FIG. 6, the caulking fastening force on the external connection side may be increased by devising the shape of the caulking portion 12 formed by the caulking process.

As shown in FIGS. 5 and 6, the caulking process is performed so that the amount of the caulking portion 12 extending to the side where the bolts 22 for external connection are arranged is larger than that of other portions.
That is, in the caulking process for the rivet 11 having a circular shape when viewed from above as shown in FIG. ) It is caulked so that the rivet diameter on the bolt 22 side is larger than other parts.

As described above, in this embodiment, by increasing the area of the caulking portion 12 on the side where the bolt 22 is disposed, the rivet 11 is provided so that the pressing amount of the metal terminal 21 by the caulking portion 12 is partially increased on the side where the bolt 22 is disposed. It is caulking.
In other words, the caulking is not carried out uniformly over the entire circumference of the rivet 11, but is caulked asymmetrically so that the caulking fastening force is increased on the side where the bolt 22 connected to the external electrode is arranged, and the external connection side The caulking process is performed so that the holding force of the metal terminal 21 by the caulking portion 12 is greater than that of other portions.

As a result, when a large fastening force (axial force) is generated when an external electrode such as an external device is connected to the bolt 22, even when an external force due to vibration is generated in the bolt 22 when the sealed battery 1 is used. Since the caulking fastening force (the load for holding the external terminal 20 by the caulking portion 12) of the caulking portion 12 on the side where the bolts 22 are arranged is large, the caulking portion 12 can be prevented from being lifted. Further, even when an external force more than expected is applied to the bolt 22 and a part of the caulking portion 12 is lifted, the compression ratio of the gasket 30 exceeding a certain level can be maintained by increasing the holding area on the bolt 22 side in advance. .
Therefore, resistance to external force applied to the external terminal 20 can be improved, and deterioration of the sealing performance related to rivet caulking can be suppressed.

In addition, as shown in FIG. 7, regarding the shape of the caulking portion 12, the length of the external connection side (bolt 22 side) is increased to increase the rivet diameter, and the compression rate of the gasket 30 on the bolt 22 side is increased. May be. That is, you may implement combining the said two embodiment.
In this case, the resistance to external force applied to the external terminal 20 can be further improved.

1: sealed battery, 2: case, 2b: lid, 10: current collecting terminal, 11: rivet, 12: crimped part, 20: external terminal, 21: metal terminal, 22: bolt

Claims (6)

An internal terminal having a rivet extending from the inside of the case to the outside;
By caulking a rivet of the internal terminal, the external terminal is connected to the internal terminal and can be connected to the external electrode;
A seal member that seals between the case and the internal terminal and the external terminal;
The caulking portion formed by caulking the rivet of the internal terminal is caulked so that the caulking load of the portion on the connection side with the external electrode of the external terminal is larger than that of the other portion, so that the external terminal The sealed battery is characterized in that the seal member is formed so that the compression rate of the seal member is larger than that of the other part at the part on the connection side with the external electrode.   2. The sealed battery according to claim 1, wherein the caulking portion extends to a connection side of the external terminal with the external electrode, and is formed so that a rivet diameter of the portion is larger than other portions. An internal terminal having a rivet extending from the inside of the case to the outside;
By caulking a rivet of the internal terminal, the external terminal is connected to the internal terminal and can be connected to the external electrode;
A seal member that seals between the case and the internal terminal and the external terminal;
The caulking portion formed by caulking the rivet of the internal terminal extends to the connection side of the external terminal with the external electrode, and is formed so that the rivet diameter of the portion is larger than other portions. A sealed battery characterized by that. The external terminal has a metal terminal connected to the rivet of the internal terminal, and an external connection terminal connected to the external electrode,
The metal terminal includes a fixed piece to which a rivet of the internal terminal is fixed, a connection piece that is bent from the fixed piece and is continuous, and a portion where the fixed piece continues extends in a direction away from the case, and the connection piece 4. The sealed battery according to claim 1, further comprising: a terminal piece that is bent continuously from the terminal piece through which the external connection terminal penetrates. 5. An internal terminal having a rivet extending from the inside of the case to the outside; an external terminal connected to the internal terminal by caulking the rivet of the internal terminal; and the case and the internal A sealing member that seals between a terminal and the external terminal, and a method for producing a sealed battery comprising:
In the step of caulking the rivet of the internal terminal to form a caulking portion,
By increasing the caulking load of the portion of the caulking portion on the side where the external electrode is connected to the external terminal, the caulking portion is sealed on the side of the external terminal connected to the external electrode. A method for producing a sealed battery, wherein the member is formed so that the compression ratio of the member is larger than that of other parts.   The method of manufacturing a sealed battery according to claim 5, wherein the caulking portion is extended to a connection side of the external terminal with the external electrode, and is formed so that a rivet diameter of the portion is larger than other portions. .

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