JP5831761B2 - Storage battery terminal structure and storage battery - Google Patents

Description

  The present invention relates to a terminal structure of a storage battery such as a lead storage battery for an automobile and a storage battery using the terminal structure for the storage battery.

  Conventionally, as a battery case lid for closing a battery case in which an electrode plate group is accommodated, for example, a synthetic resin lid body is formed by insert molding a metal bushing such as lead or a lead alloy. The bushing is formed with an insertion hole into which a pole column extending from the electrode plate group is inserted and welded.

  Here, as shown in Patent Document 1, the insertion hole formed in the bushing extends from the base end side (lower side) where the pole column is inserted to the distal end side (upper side) in order to facilitate insertion of the pole column. It has a generally tapered shape that gradually decreases in diameter as it goes. Since the pole column is inserted from the base end side of the insertion hole and the tip portions of the bushing and the pole column are welded together, the portion other than the tip portion of the insertion portion in the pole column and the tip portion other than the tip portion in the insertion hole A gap is formed between the portions.

  Since the gap is formed between the pole column and the insertion hole in this way, when the electrode plate group vibrates in the battery case, the vibration is transmitted to the bushing and the welded portion of the pole column, and the welded portion There is a problem that stress is applied and cracks and breakage occur.

  Here, as shown in Patent Document 2, by forming a drawing portion on the bushing, the dimension between the inner peripheral surface of the bushing at the lower side of the insertion hole and the outer peripheral surface of the polar column is set to 0.0 to 0.0. The thing prescribed | regulated to 0.3 mm is considered.

  However, the above configuration is an idea of reducing the interval between the opening shape of the insertion hole of the bushing and the cross-sectional shape of the pole column, and depending on the processing accuracy of the drawn portion, it may be less than 0.3 mm. May be larger, or the aperture diameter of the drawn portion may be smaller than the outer diameter of the pole column. Here, when it becomes larger than 0.3 mm, the problem of the crack and destruction of a welding part arises as usual. On the other hand, when the opening diameter of the drawn portion is smaller than the outer diameter of the pole column, there is a problem that it becomes difficult to insert the pole column into the drawn portion and hinders workability.

JP 2002-50327 A JP-A-10-144287

  Therefore, the present invention eliminates the conventional idea of reducing the gap between the opening shape of the insertion hole and the cross-sectional shape of the pole column, thereby reducing the gap between the bushing and the pole column. The main intended task is to prevent cracking, breakage, and the like in the welded portion.

That is, in the storage battery terminal structure according to the present invention, the pole column extending from the electrode plate is inserted into the insertion hole formed in the bushing embedded in the battery case lid, and the tip of the bushing and the tip of the pole column are inserted. A storage battery terminal structure formed by welding, wherein one or a plurality of deformable convex portions are formed on the outer peripheral surface of the base end side of the insertion portion in the polar column, and the insertion portion is formed in the insertion hole. By being inserted, the convex portion is deformed in contact with the inner peripheral surface of the insertion hole so as to fill a gap formed between the inner peripheral surface of the insertion hole and the outer peripheral surface of the insertion portion. It is comprised, The protrusion part of the said bushing and the welding part of the front-end | tip part of the said pole pole, and the said convex part are spaced apart, It is characterized by the above-mentioned. Here, filling the gap formed between the inner peripheral surface of the insertion hole and the outer peripheral surface of the insertion portion means that the convex portion contacts the inner peripheral surface of the insertion hole and deforms to form the entire circumferential direction of the gap. May be used, or a part of the gap in the circumferential direction may be filled.

  If it is such, when the 1 or several convex part formed in the outer peripheral surface of the insertion part in a pole pole will be inserted in an insertion hole, it will deform | transform and the outer peripheral surface of an insertion hole and the outer peripheral surface of an insertion part Therefore, even if the electrode plate vibrates with respect to the battery case lid, since the vibration of the electrode plate is absorbed by the convex portion, it is difficult to be transmitted to the welded portion. For this reason, it is possible to prevent cracking or breakage of the bushing and the welded portion of the pole column, and it is possible to extend the life of the terminal structure. As described above, the present invention is based on the premise that the convex portion formed in the insertion portion is in contact with the inner peripheral surface of the insertion hole and deforms, and the geometric shape of the opening shape of the insertion hole and the cross-sectional shape of the pole column. Therefore, it is difficult to be influenced by the processing accuracy of the insertion hole and the processing accuracy of the pole column.

  In order to further reduce the vibration applied to the welded portion of the bushing and the pole column, the convex portion is formed on the base end side of the insertion portion where the pole column is inserted, and the inner peripheral surface of the insertion hole is It is desirable to fill a gap formed between the base end side and the base end side of the insertion portion.

  It is desirable that a cross-sectional dimension of the insertion portion having the convex portion is larger than an opening dimension of the proximal end side opening of the insertion hole. For example, in the case where the pole column and the insertion hole have a circular cross section, the outer diameter of the circumscribed circle of the portion having the convex portion in the insertion portion may be larger than the opening diameter of the proximal end opening of the insertion hole. . In this case, when the insertion portion is inserted into the insertion hole, the convex portion comes into contact with the proximal end side opening of the insertion hole, so that the convex portion is brought into contact with the inner peripheral surface of the insertion hole and reliably deformed. be able to.

  It is desirable that the convex portion forms a ridge formed along the axial direction of the polar column. If this is the case, the convex portion forms a protrusion along the axial direction, and the frictional resistance when the pole column is inserted into the insertion hole can be reduced.

  It is desirable that the convex portion is formed along the axial direction of the pole column and has a wedge shape with a height dimension that decreases toward the distal end side in the axial direction. If it is this, it can make it easy to insert the insertion part of a pole pole in an insertion hole. Further, since the base end side in the axial direction of the convex portion is strongly pressed by the inner peripheral surface of the insertion hole, it is possible to improve the vibration resistance and the shock resistance by strengthening the fixing of the pole column to the bushing.

  It is desirable that a plurality of the convex portions are formed at equal intervals in the circumferential direction of the insertion portion. If this is the case, it is possible to prevent the welded portion from being cracked or broken against vibrations and impacts from all directions orthogonal to the axial direction of the pole column.

  According to the present invention configured as described above, since the convex portion of the insertion portion in the pole column is deformed and fills between the inner peripheral surface of the insertion hole and the outer peripheral surface of the insertion portion, the bushing and the welded portion of the polar column Cracks, breakage, etc. can be prevented.

The longitudinal cross-sectional view along the axial direction which shows the terminal structure for storage batteries of this embodiment. The cross-sectional view orthogonal to the axial direction which shows the terminal structure for storage batteries of the embodiment. The schematic diagram which shows the state which the bushing and pole pole of the embodiment isolate | separated. The figure which shows the convex part shape of deformation | transformation embodiment. The figure which shows the arrangement | positioning aspect of the convex part of deformation | transformation embodiment. The figure which shows the cross-sectional shape of the convex part of deformation | transformation embodiment. The figure which shows the convex part shape of deformation | transformation embodiment. The longitudinal cross-sectional view along the axial direction which shows the terminal structure for storage batteries of deformation | transformation embodiment.

  An embodiment of a storage battery terminal structure according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the storage battery terminal structure 1 of the present embodiment constitutes an external terminal structure of a storage battery such as an automotive lead storage battery, and a bushing 2 embedded in a battery case lid 5. The pole column 3 extending from the electrode plate group (not shown) is inserted into the insertion hole 2H formed in the above, and the tip portion 2a of the bushing 2 and the tip portion 3a of the pole column 3 are welded. The external terminal structure has the same configuration in the positive terminal portion and the negative terminal portion.

  The bushing 2 has a substantially cylindrical shape, and an insertion hole 2H having a substantially circular shape into which the pole 3 is inserted is formed in the central axis C thereof. The bushing 2 is formed by forging or casting a metal material. For example, in a lead storage battery, the bushing 2 is formed of lead or a lead alloy. The insertion hole 2H has, for example, a generally tapered shape that gradually decreases in diameter from the base end side (lower side) on the battery case side toward the distal end side (upper side) (see FIG. 1). The opening diameter of the distal end side opening is substantially the same as or slightly larger than the outer diameter of the distal end portion 3 a of the pole 3.

  The pole column 3 has a substantially cylindrical shape in which the proximal end side is connected to the electrode plate group and the distal end side is welded to the bushing 2. The pole 3 is made of a metal material. For example, in a lead storage battery, the pole 3 is made of lead or a lead alloy.

  And the some convex part 4 is formed in the outer peripheral surface 31 of the insertion part 3x to the said insertion hole 2H in the pole 3. The convex portion 4 is made of the same metal material as the pole 3 and has a deformable thickness. In addition, the convex part 4 may be formed integrally with the pole 3, or may be separately formed and joined.

  The convex portion 4 is deformed by contacting the inner peripheral surface 21 of the insertion hole 2H when the pole 3 is inserted into the insertion hole 2H, so that the inner peripheral surface 21 of the insertion hole 2H and the insertion portion 3x. The gap S formed between the outer peripheral surfaces 31 is filled at least partially in the circumferential direction. As shown in FIG. 2, the convex portion 4 of the present embodiment is formed at least on the base end side (lower side) of the insertion portion 3x, and the base end side of the inner peripheral surface 21 of the insertion hole 2H and the insertion portion 3x. The gap S formed between the base ends is filled.

  Further, as shown in FIG. 2, a plurality of convex portions 4 are formed at equal intervals in the circumferential direction of the insertion portion 3x, and the respective convex portions 4 have the same shape. As a specific shape, it forms a ridge formed along the axial direction of the pole column 3, and more specifically, it is formed along the axial direction of the pole column 3 and goes to the tip end side in the axial direction. Accordingly, the height (projection dimension) is reduced to a wedge shape.

  In the present embodiment, as shown in FIG. 3, the cross-sectional dimension L1 of the insertion portion 3x having the convex portion 4 (specifically, the diameter of a virtual circumscribed circle circumscribing the plurality of convex portions 4) is the insertion hole 2H. The base end side opening (lower side opening) is configured to be larger than the opening dimension L2 (specifically, the diameter of the base end side opening). In the present embodiment, since the convex portion 4 has a wedge shape, the cross-sectional dimension differs for each position along the axial direction. Therefore, at least the convex portion 4 has a cross-sectional dimension L1 on the axial base end side of the insertion hole 2H. It is comprised so that it may become larger than the opening dimension L2 of proximal end opening.

  And when the insertion part 3x of this pole 3 was inserted in the insertion hole 2H of the bushing 2, the convex part 4 contacted and deform | transformed the inner peripheral surface 21 of the insertion hole 2H, and it was formed in the both sides of the said convex part 4 The convex part 4 deform | transforms into space. Thereby, the insertion part 3x of the pole 3 is fixed to the insertion hole 2H at a plurality of positions at equal intervals in the circumferential direction. Moreover, after this insertion, the front-end | tip part 2a of the bushing 2 and the front-end | tip part 3a of the pole 3 are welded. In addition, since the pole 3 is fixed to the insertion hole 2H, this welding operation is facilitated.

  According to the storage battery terminal structure 1 according to the present embodiment configured as described above, when one or a plurality of convex portions 4 formed on the outer peripheral surface 31 of the insertion portion 3x in the pole column 3 is inserted into the insertion hole 2H. Since the gap S formed between the inner peripheral surface 21 of the insertion hole 2H and the outer peripheral surface 31 of the insertion portion 3x is filled by deformation, the vibration of the electrode plate is blocked by the convex portion 4, so that the welding portion It becomes difficult to be transmitted. For this reason, the crack or destruction of the welding part of the bushing 2 and the pole 3 can be prevented, and the lifetime improvement of the terminal structure 1 can be enabled. Moreover, the terminal structure 1 of this embodiment forms the convex part 4 in the insertion part 3x, contacts the inner peripheral surface 21 of the insertion hole 2H, and deform | transforms the said convex part 4H. Since the opening shape and the cross-sectional shape of the pole column 3 are not close to each other, it is difficult to depend on the processing accuracy of the insertion hole 2H and the processing accuracy of the pole column 3.

  Although it is conceivable to form the convex portion 4 in the insertion hole 2H, in this case, the tip portion 3a may be damaged by the convex portion 4 when the polar column 3 is inserted. In this embodiment, since the convex part 4 is formed in the insertion part 3x of the polar pole 3, compared with the case where the convex part 4 is formed in the insertion hole 2H, the front-end | tip part 3a is a convex part at the time of insertion of the polar pole 3. 4 can suppress damage and can be more reliably welded to the tip 2a of the bushing 2.

  Further, the convex portion 4 is formed on the proximal end side of the insertion portion 3x, and is configured to fill and fix the gap S between the proximal end side of the insertion hole 2H and the proximal end side of the insertion portion 3x. The vibration applied to the welded portion between the bushing 2 and the pole column 3 can be further reduced by the distance from the welded portion between the tip portion 2 a of the bushing 2 and the tip portion 3 a of the pole column 3.

  In addition, since the cross-sectional dimension L1 of the insertion portion 3x having the convex portion 4 is configured to be larger than the opening size L2 of the proximal end side opening of the insertion hole 2H, the insertion portion 3x is inserted into the insertion hole 2H. In doing so, since the convex portion 4 comes into contact with the proximal end side opening of the insertion hole 2H, the convex portion 4 can be brought into contact with the inner peripheral surface 21 of the insertion hole 2H and reliably deformed.

  In addition, since the protrusion 4 is a protrusion formed along the axial direction of the pole 3, the frictional resistance when the pole 3 is inserted into the insertion hole 2 </ b> H can be reduced, and the pole 3 Can be smoothly inserted into the insertion hole 2H.

  Furthermore, since the convex portion 4 has a wedge shape with a height dimension that decreases toward the tip end side in the axial direction, the insertion portion 3x of the pole 3 can be easily inserted into the insertion hole 2H. Further, since the base end side in the axial direction of the convex portion 4 is strongly pressed by the inner peripheral surface 21 of the insertion hole 2H, the pole column 3 is strongly fixed to the bushing 2 to improve vibration resistance and impact resistance. be able to.

  In addition, since the plurality of convex portions 4 are formed at equal intervals in the circumferential direction of the insertion portion 3x, the welded portion cracks and breaks against vibration and impact from all directions orthogonal to the axial direction of the pole column 3. Can be prevented.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the convex portion 4 forms a ridge extending in the axial direction. For example, as shown in FIG. 4A, a columnar shape provided on the proximal end side of the insertion portion 3x is formed. As shown in FIG. 4 (B), it may be a hook formed along the circumferential direction in the insertion portion 3x.

  Moreover, as shown in FIG. 5, you may form several convex part 4a, 4b along with the front end side and base end side in an axial direction. In this case, the height dimension (protrusion dimension) of the convex part 4a on the axial front end side is set to the height of the convex part 4b on the axial base end side so that the pole 3 can be easily inserted into the insertion hole 2H of the bushing 2. It is conceivable to make it smaller than the dimension.

  Further, the insertion hole 2H is not limited to a generally tapered shape, and may have an equal cross-sectional shape from the base end side (lower side) to the distal end side (upper side).

  Furthermore, a plurality of convex portions 4 may be formed in the insertion portion 3x, or only one. For example, when the convex part 4 is provided in a part in the circumferential direction of the insertion part 3x, if the convex part 4 comes into contact with the inner peripheral surface 21 of the insertion hole 2H when the insertion hole 2H is tapered, the pole pole 3 is inclined with respect to the bushing 2, and in this case, as described above, it is desirable that the insertion hole 2H has an equal cross-sectional shape.

  In addition, the cross section perpendicular to the axial direction of the convex portion 4 of the embodiment has a rectangular shape having the same width from the radially inner side to the radially outer side, as shown in FIG. As described above, the taper may have a tapered shape in which the width decreases from the radially inner side to the radially outer side. Further, as shown in FIG. 6B, the cross section orthogonal to the axial direction of the convex portion 4 may be such that its width gradually decreases from the radially inner side to the radially outer side. Thus, by reducing the width of the convex portion 4 on the outer side in the radial direction, in the initial stage of inserting the pole column 3 into the insertion hole 2H, the convex portion 4 can be easily deformed to facilitate the insertion operation, and the latter stage of insertion. In the stage, the pressing force of the pole 3 against the insertion hole 2H is increased by the large width of the convex portion 4, and the fixing can be ensured.

  In addition, although the convex part 4 of the said embodiment was provided intermittently in the circumferential direction of the insertion part 3x, as shown in FIG. 7, it covers over the perimeter in the circumferential direction of the insertion part 3x. It may be provided. In this case, the convex portion 4 has a hook shape formed on the outer peripheral surface 31 of the insertion portion 3x, and bends to the base end side as it is inserted into the insertion hole 2H. A gap S between the peripheral surface 31 and the inner peripheral surface 21 of the insertion hole 2H is filled.

  Moreover, the convex part 4 formed in the pole 3 may be made of a material different from that of the pole 3, and if it can be deformed when the pole 3 is inserted into the insertion hole 2H, for example, an elastic material such as rubber. May be formed. However, in the case of a material different from that of the pole 3, an acid-resistant material that is not easily corroded by the electrolytic solution in the battery case is preferable.

  Furthermore, as shown in FIG. 8, the convex portion 4 formed on the pole column 3 may extend to the strap 6 connected to the pole column 3 (a conductor for connecting polar plates of the same polarity). good. When the strap 6 and the pole column 3 are cast and molded, they are integrally molded. Therefore, by adopting the above configuration, the strap 6 and the pole column 3 can be removed from the mold by being pulled out in one direction from the mold to the strap 6 side. The cost of the mold can be reduced. In addition, when the convex part 4 is formed in the pole 3 as shown in FIG. 1, the pole 3 cannot be turned to the strap 6 side, and it is necessary to cast it by combining a plurality of divided molds. This increases the cost of the mold.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Storage battery terminal structure 2 ... Bushing 2H ... Insertion hole 21 ... Inner peripheral surface 3 of insertion hole ... Polar pole 3x ... Insertion part 31 ... Outer circumference of insertion part Surface 4 ... convex part S ... gap 5 ... battery case lid

Claims (2)

A storage battery terminal structure in which a pole column extending from an electrode plate is inserted into an insertion hole formed in a bushing embedded in a battery case lid, and the tip of the bushing and the tip of the pole column are welded. ,
One or a plurality of deformable convex portions are formed on the outer peripheral surface on the proximal end side of the insertion portion in the polar column,
When the insertion portion is inserted into the insertion hole, the convex portion comes into contact with the inner peripheral surface of the insertion hole and deforms, and between the inner peripheral surface of the insertion hole and the outer peripheral surface of the insertion portion. It is configured to fill the gaps that are formed ,
The terminal structure for storage batteries in which the welding part and the convex part of the front-end | tip part of the said bushing and the front-end | tip part of the said pole column are spaced apart . A storage battery having the storage battery terminal structure according to claim 1 .