JP2010238552A - Lead acid battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead acid battery for more reliably preventing stain-over of electrolyte by sufficiently receiving torque when fastened. <P>SOLUTION: The lead acid battery includes: a metal bushing 1 having a plurality of annular grooves 4 formed in the outer periphery extending in the peripheral direction, and insert-molded on a resin battery lid 8; and an electrode pole 9 as an electrode inserted through the inner periphery of the bushing 1, wherein the electrode pole 9 and the bushing 1 are joined together to form a terminal part 10. A plurality of rotation preventive ribs 5 are provided on the outer periphery of the bushing 1 in the state that all or part of them are positioned within a top plate thickness T of a top plate 8A of the battery lid 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lead-acid battery used for automobiles, and more particularly to the shape of a bushing provided on a battery lid.

  A lead storage battery used for automobiles or the like includes a synthetic resin battery case and a synthetic resin battery lid which is fused to the upper part of the battery case to close the battery case. These battery case and battery lid are made of synthetic resin such as ABS resin or polypropylene (PP) resin. Usually, a terminal part is provided on the upper part of the battery lid, and this terminal part is composed of a lead alloy pole column extending from the inside of the battery case to the outside, and a lead alloy bushing into which the pole column is inserted. It has. The bushing is formed on the battery lid by insert molding, and the pole column is welded to the bushing outside the battery case.

  At the time of insert molding, the lower half of the bushing is molded by being inserted into the resin material of the battery lid. However, there is virtually no adhesive force between the bushing metal material and the battery lid resin material, and the bushing and battery lid do not adhere to each other, creating a minute gap at the interface, It is known that as the process progresses, the electrolytic solution in the battery case crawls through the gap and oozes out to the terminal portion.

  Therefore, generally, as shown in FIGS. 9 and 10, annular protrusions 503 are formed in a plurality of upper and lower stages on the outer periphery of the substantially lower half of the bushing 501, and the formed portions of the annular protrusions 503 are inserted into the resin of the battery lid 508. The path through which the electrolyte rises is lengthened to prevent the seepage (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). In FIG. 10, reference numeral 509 denotes a pole column inserted into the bushing 501, and an upper portion of the pole column 509 is welded to the bushing 501.

  By the way, connection terminals, such as a harness terminal, are connected to the terminal part of a lead acid battery. In a lead acid battery for automobiles, a current of about 100 to several hundreds A flows through the connection terminal, and a large current of about 1000 A flows in a lead acid battery for a large backup power source used for various emergency power supplies. For this reason, when connecting the connection terminal to the terminal portion 510, the connection terminal is tightened and connected to the bushing 501 of the terminal portion 510 while applying a considerably strong torque.

  However, the bushing 501 may be rotated by the tightening torque. Therefore, in the technique referred to in Patent Document 1, as shown in FIGS. 9 and 10, a rib 505 for preventing rotation is formed integrally with the annular protrusion 503 in the bushing 501, and the connection terminal is tightened with this rib 505. The torque is received and the rotation is prevented.

JP 2003-317777 A JP 2004-235050 A Registered Utility Model No. 3047311

  However, the conventional rib configuration is insufficient to receive the torque at the time of tightening the connection terminal. That is, even in the conventional rib configuration, the clearance at the boundary surface between the bushing and the resin around the insert portion of the battery lid is widened by the torque at the time of tightening the connection terminal. For this reason, even if a plurality of annular protrusions 503 are provided on the bushing 501 to extend the creeping path of the electrolytic solution, there is a problem that the electrolytic solution oozes out over time and corrodes the connection terminals.

  This invention is made | formed in view of the situation mentioned above, and aims at providing the lead acid battery which can improve the tolerance with respect to the torque at the time of clamping | tightening, and can prevent more reliably the electrolyte solution oozes out.

  In order to achieve the above object, according to the present invention, a plurality of annular grooves extending in the circumferential direction are formed on the outer periphery of a metal bushing, and insert molding is performed on a resin battery lid, and an electrode is formed on the inner periphery of the bushing. In a lead-acid battery in which the electrode and the bushing are joined to form a terminal portion, the outer periphery of the bushing is partially or entirely positioned within the top plate thickness of the top plate of the battery lid, A plurality of ribs for stopping are provided.

  According to the present invention, in the above invention, a bowl-shaped annular projection formed between the two annular grooves is positioned within the top plate thickness of the top plate of the battery lid, and a part of the annular projection is recessed. The rib is formed on the remaining portion.

  Moreover, the present invention is characterized in that, in the above-mentioned invention, the rib is positioned over 30% or more of the top plate thickness of the top plate of the battery cover.

  In the invention described above, the distance from the central axis of the bushing to the outer peripheral surface of the rib may be 124% to 133% of the length of a half of the dimension of the terminal D of the bushing. .

  Moreover, the present invention is characterized in that, in the above invention, the ribs are extended obliquely with respect to the vertical direction in a range of 90 degrees to 60 degrees with a horizontal plane as a reference of 0 degrees.

  Moreover, the present invention is characterized in that, in the above-mentioned invention, a concave portion is formed on a peripheral surface of a bowl-shaped annular protrusion formed between each of the annular grooves.

  According to the present invention, a part or all of the bushing is located within the top plate thickness of the top plate of the battery cover and has a plurality of ribs for preventing rotation, so that the torque at the time of tightening can be reduced. The entire top plate of the battery lid is received through the rib. As a result, the resistance to the tightening torque is improved, and the spread of the gap between the bushing and the battery lid due to the tightening is suppressed, so that it is possible to more reliably prevent the electrolyte from seeping out.

It is a perspective view which shows the external appearance structure of the bushing which concerns on 1st Embodiment of this invention. It is sectional drawing of the terminal part of the lead acid battery comprised using the bushing which concerns on the same embodiment. It is a perspective view which shows the external appearance structure of the bushing provided with the rib located in the whole thickness of a top plate. It is sectional drawing of the terminal part of the lead acid battery comprised using the bushing. It is a perspective view which shows the external appearance structure of the bushing which concerns on 2nd Embodiment. It is a figure which shows both the front and cross section of the bushing which concerns on the same embodiment. It is sectional drawing of the terminal part of the lead acid battery comprised using the bushing which concerns on the same embodiment. It is a figure which shows the rib shape of the bushing which concerns on the modification of this invention. It is a perspective view which shows the external appearance structure of the bushing of the conventional lead acid battery. It is sectional drawing of the terminal part of the lead acid battery comprised using the conventional bushing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a perspective view showing a bushing 1 of a lead storage battery according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the terminal portion 10 of the lead storage battery constructed using the bushing 1.
As shown in FIG. 1, the bushing 1 includes a hollow cylindrical main portion 2 made of a lead alloy, and an annular protrusion 3 that is integrally formed on the outer periphery of the lower half of the main portion 2 so as to protrude in a plurality of stages. I have. Each annular protrusion 3 is a hook-shaped protrusion extending continuously in the circumferential direction of the main portion 2, and an annular groove 4 is formed between the adjacent annular protrusions 3. The outermost annular projection 3A has an outer diameter dimension larger than the outer diameter dimension of the lower annular projection 3.

  In the bushing 1 of this embodiment, the annular protrusions 3A and 3B are formed so as to be connected vertically in the annular groove 4A between the first and second annular protrusions 3A and 3B from the top. A plurality of ribs 5 as a rotation stop are integrally formed. The plurality of ribs 5 are formed so as to be arranged at regular intervals along the circumferential direction of the annular protrusion 3.

  A plurality of rectangular recesses 6 are formed on the outer peripheral surface of the second annular projection 3B from the top. These recesses 6 are formed on the upper surface of the annular protrusion 3B so as to be opened at arbitrary positions separated from each other along the circumferential direction of the annular protrusion 3B. By forming such a recess 6 in the annular protrusion 3B, the entire volume of the bushing 1 is reduced by the volume of the recess 6. Thereby, the mass and the usage-amount of lead of the bushing 1 can be reduced, and the weight reduction and cost reduction of the bushing 1 are achieved. In addition, you may form the recessed part 6 also in the cyclic | annular protrusion 3C-3D of the same 3rd-5th step.

  In the present embodiment, the bushing 1 having the shape as described above is produced by gravity casting under the conditions of a mold temperature of 180 to 240 ° C. and a lead alloy molten metal temperature of 400 to 440 ° C., for example, using a mold having a predetermined shape. . Note that the shape of the recess 6 is not limited to a rectangular shape, and may be a triangular shape, a rectangular shape, a track shape, or the like as long as it can be punched with a mold.

  When the terminal portion 10 is formed on the battery lid 8 using the bushing 1, as shown in FIG. 2, the first step from the top of the bushing 1 is placed in the cylindrical portion 8 </ b> B provided on the top plate 8 </ b> A of the battery lid 8. It is formed by inserting the lower side from the annular protrusion 3A. Then, the pole 9 as an electrode is inserted into the hollow of the bushing 1, and the upper portion 9 </ b> A of the pole 9 is welded to the bushing 1.

  Here, at the time of insert molding, in the present embodiment, the height H (that is, the first and second annular protrusions 3A and 3B from the top) in the vertical direction (longitudinal direction of the pole column 9) of the rib 5 that prevents the rotation. ) Is inserted into the battery lid 8 so that it is positioned within the range of the thickness T of the top plate 8A.

As a result, in the terminal portion 10, the tightening torque when the connection terminal such as the harness terminal is connected is received by the entire top plate 8 </ b> A of the battery lid 8 through the rib 5 for preventing rotation. As a result, resistance to the tightening torque is improved, and the expansion of the gap between the interface between the bushing 1 and the battery lid 8 due to the tightening is suppressed, so that it is possible to more reliably prevent the electrolyte from leaking out.
Further, since the plurality of ribs 5 are provided at regular intervals along the circumferential direction of the outer peripheral surface of the bushing 1, the tightening torque is evenly distributed to the top plate 8 </ b> A of the battery lid 8 through each rib 5. Accordingly, the gap between the boundary surface of the specific rib 5 and the battery cover 8 is not wider than the boundary surface of the other ribs 5 due to the bias of the tightening torque to each rib 5, and the entire circumference of the bushing 1 is not generated. It is possible to evenly suppress the seepage of the electrolytic solution.

  In such a configuration of the bushing 1, the improvement of the tightening torque resistance by the rib 5 can be obtained by positioning the rib 5 within the range of the thickness T of the top plate 8A, and in the range of the thickness T of the top plate 8A. As the ratio of the ribs 5 increases, the improvement width increases.

More specifically, the inventors changed the height H of the rib 5 to change the ratio of the rib 5 in the range of the thickness T of the top plate 8A to 0%, 30%, 50%, and 100%. In this case, the terminal strength test of the terminal portion 10 is performed at each torque by the method according to JIS-D5301, and the external appearance of the periphery of the terminal portion 10 is observed, and the terminal portion 10 and the battery lid 8 are disassembled after one week. The bushing 1 was inspected for corrosion. In this terminal strength test, the maximum torque value at which no corrosion is seen in the bushing 1 is obtained as the tightening torque value.
3 shows the bushing 1 when the height 5 of the rib 5 is formed so that the rib 5 is located at 100% of the range of the thickness T of the top plate 8A (the entire thickness T). It is sectional drawing of the terminal part 10 of the lead acid battery comprised using this bushing 1. FIG. In the bushing 1 shown in these drawings, in order to position all the ribs 5 within the range of the thickness T of the top plate 8A, the ribs 5 are interposed between the second and third annular protrusions 3B and 3C from the top. Is forming.

As a result of the terminal strength test, when the rib 5 is positioned at 0% of the thickness T of the top plate 8A, that is, when the rib 5 is not positioned within the thickness T of the top plate 8A, the tightening torque value is about 12 N · m was found to be m.
In contrast, as the ratio of the ribs 5 positioned within the range of the thickness T of the top plate 8A is sequentially increased, the tightening torque value is improved, and the ribs 5 are positioned over 30% of the thickness T of the top plate 8A. In some cases, it was found that a tightening torque value reaching about 16.5 N · m was obtained.

In general, even when the connection terminal is fastened to the bushing 1 with the tightening torque kept below the anti-tightening torque value, the electrolyte rises up through the interface between the bushing 1 and the battery lid 8 as time elapses. As the tightening torque approaches the tightening torque value, the electrolyte creeps up to the upper part of the bushing 1 and is more likely to ooze out and the connection terminal is more likely to be corroded.
On the other hand, when the anti-tightening torque value reaches about 16.5 N · m, the electrolyte does not crawl up at the interface between the bushing 1 and the battery lid 8 even if time passes. As a result, a lead-acid battery capable of preventing the electrolyte from seeping out and reliably preventing corrosion of the connection terminals can be obtained.

In addition to increasing the ratio of the ribs 5 located within the range of the thickness T of the top plate 8A by increasing the height H of the ribs 5 or the like, the side surface 5A (FIG. 1) of the ribs 5 The value can also be improved by increasing the area (in this embodiment, the cross-sectional area of the annular groove 4) to increase the area that receives torque during tightening.
However, since the volume of the rib 5 increases as the height H of the rib 5 and the area of the side surface 5A are increased, the mass of the bushing 1 and the amount of lead used also increase. In addition to this, as the height H of the rib 5 is increased, the linear distance between the boundary surface of the rib 5 and the battery lid 8 becomes longer, so that the electrolyte tends to crawl up at that portion.
Therefore, in the present embodiment, the amount of increase in the volume of the rib 5 and the easiness of the electrolyte to rise due to the height H of the rib 5 are taken into consideration within the range in which the tightening torque value of 16.5 N · m can be obtained. The height H of the rib 5 and the area of the side surface 5A are adjusted.

  As described above, according to the present embodiment, since the plurality of ribs 5 for preventing rotation are provided within the thickness T of the top plate 8 </ b> A of the battery lid 8, the torque at the time of tightening passes through the rib 5 and the battery lid. It is received by the whole top plate. As a result, the resistance to the tightening torque is improved and the spread of the gap between the bushing 1 and the battery lid 8 accompanying the tightening is suppressed, so that it is possible to more reliably prevent the electrolyte from leaking out.

  In addition, according to the present embodiment, the rib 5 is positioned over 30% of the thickness T of the top plate 8A of the battery lid 8, so that the electrolyte solution at the interface between the bushing 1 and the battery lid 8 can be obtained. It can be prevented from causing a crawl.

  Moreover, according to this embodiment, since the recessed part 6 was formed in the surrounding surface of the collar-shaped annular protrusion 3 formed between each of the annular grooves 4, the whole volume of the bushing 1 is equivalent to the volume of these recessed parts 6. Reduced. As a result, the mass of the bushing 1 and the amount of lead used can be reduced, and the weight and cost of the bushing 1 can be reduced.

<Second Embodiment>
FIG. 5 is a perspective view showing a bushing 101 of a lead storage battery according to the second embodiment of the present invention, and FIG. 6 is a view showing both the front surface and the cross section of the bushing 101. FIG. 7 is a cross-sectional view of the terminal portion 110 of the lead storage battery configured using the bushing 101.
As shown in these drawings, in the bushing 101 according to the present embodiment, among the plurality of annular protrusions 103 formed on the peripheral surface, the second-stage annular protrusion 103B from the top is higher than the other annular protrusions 103 in the vertical direction. Is also formed with a width. Specifically, as shown in FIG. 7, the second-stage annular protrusion 103B has a lower edge extending at least to the same position as the lower surface of the top plate 8A (the surface facing the battery case) or to a lower position. Have a width. As shown in FIG. 5, the lower edge portion is provided with a plurality of concave portions 106 along the circumferential direction, and the remaining portions between the concave portions 106 are formed as ribs 105 for preventing rotation.
Thus, by forming the remaining portion between the concave portions 106 as the rib 105, the mass of the bushing 101 and the amount of lead used can be greatly reduced.

  Further, as shown in FIG. 7, the bushing 101 is inserted into the battery lid 8 so that the rib 105 is located within the thickness T of the top plate 8A of the battery lid 8, as in the first embodiment, so that the terminal portion 110 is Molded. Thereby, as in the first embodiment, an improvement in the tightening torque value is obtained.

Here, in the bushing 1, in “JIS-D5301 7.2 terminal”, the maximum diameter of the tapered main portion 102 is defined as the D dimension. In this embodiment, the rib is defined based on the D dimension. The protrusion amount of 105 in the radial direction is defined.
Specifically, as shown in FIG. 6, when the distance from the central axis O of the bushing 1 to the outer peripheral surface 105B of the rib 105 is R, this distance R is 124% with respect to ½ of the D dimension. It is set to ~ 133%.
That is, as the distance R is increased, the area of the side surface 105A of the rib 105 is increased and the tightening torque value is improved. In particular, the distance R is set to 124% or more of the length of ½ of the D dimension. Thus, the tightening torque value of 16.5 N · m or more is obtained even in the range where the ratio of the ribs 105 positioned within the range of the thickness T of the top plate 8A exceeds 0 and less than 30%. Can prevent creeping up.
However, it has been found that when the distance R is increased to some extent, a saturation tendency is observed in the improvement range of the tightening torque value. Further, as the distance R increases, the volume of the rib 105 increases, and the mass of the bushing 1 and the amount of lead used increase. Therefore, by limiting the distance R of the rib 5 to 133% of the length of ½ of the D dimension, it is possible to suppress the increase in the mass of the bushing 1 and the amount of lead used within a reasonable range, and provide a good anti-tightening torque value. Can be realized.

  As described above, according to the present embodiment, the lower edge portion of the annular protrusion 103B is positioned within the thickness T of the top plate 8A of the battery lid 8, and a part of the peripheral surface of the annular protrusion 103B is recessed. Since the remaining portion is formed as the non-rotating rib 105, the mass of the bushing 101 and the amount of lead used can be greatly reduced while improving the tightening torque value.

  In addition, according to the present embodiment, the distance R from the central axis O of the bushing 101 to the outer peripheral surface 105B of the rib 105 is set to 124% or more of the half length of the terminal D dimension of the bushing 101. It was. With this configuration, the area of the side surface 105A of the rib 105 is increased, so that the area that receives the torque during tightening can be increased, and the tightening torque value can be improved.

In addition, since the rib 105 is positioned within the thickness T of the top plate 8A of the battery cover 8, a good tightening torque value is secured, so the distance R of the rib 105 is increased to increase the area of the side surface 105A. Accordingly, the height H of the rib 105 can be reduced, and further, the distance R of the rib 105 is increased, and the number of steps of the annular protrusion 103 can be reduced by the amount of the electrolyte rising-up path. Thus, since the height H of the rib 105 and the number of steps of the annular protrusion 103 can be reduced, the thickness of the battery lid 8 can be reduced. Therefore, the size of the lead storage battery can be made compact in the height direction, and the volume energy density of the lead storage battery can be improved.
In addition, since the distance R is limited to 133% or less of the length that is ½ of the dimension of the terminal D, the tightening torque that can prevent the electrolyte from leaking while suppressing the increase in the mass of the bushing 1 and the amount of lead used. Value can be realized.

  Each embodiment mentioned above shows one mode of the present invention to the last, and can be arbitrarily modified and applied without departing from the gist of the present invention.

  For example, in each embodiment, as shown in a bushing 201 in FIG. 8, an angle α = 90 degrees to 60 degrees (or 90 degrees to 120 degrees) with respect to a direction K extending up and down the rib 205 with respect to a horizontal plane of 0 degrees. ) May be inclined with respect to the vertical direction. In FIG. 8, the same members as those shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 8, by inclining the ribs 205, it is possible to lengthen the path of the electrolyte solution so that the electrolyte solution can be prevented from seeping up.
In addition, although the inventors decrease the tightening torque value as the inclination angle α of the rib 205 deviates from 90 degrees, if the angle α is 60 degrees or more, the effect of improving the tightening torque value, It has been found that the electrolyte soaking-up can be prevented by the effect of extending the liquid soaking path.

  Further, for example, in each embodiment, the number of stages of the annular protrusions 3 and 103 is five or four, which is generally used for a lead acid battery for automobiles. However, when the lead acid battery for a motorcycle is used, the number of stages is four. It is good also as a stage or three stages.

1, 101, 201, 501 Bushing 2 Main part 3, 103, 503 Annular projection 4 Annular groove 5, 105, 205, 505 Rib 5A, 105A Side surface 105B, 205B Outer peripheral surface 6, 106 Recessed part 8, 508 Battery cover 8A Top plate 9,509 pole pole (electrode)
10, 110, 510 Terminal portion O Center axis R Distance

Claims (6)

A plurality of annular grooves extending in the circumferential direction are formed on the outer periphery of the metal bushing, insert-molded into a resin battery lid, an electrode is inserted into the inner periphery of the bushing, and the electrode and the bushing are coupled. In a lead-acid battery with a terminal part,
On the outer periphery of the bushing, a part or all of the bushing is positioned within the top plate thickness of the top plate of the battery lid, and includes a plurality of ribs for stopping rotation.
Lead acid battery characterized by that. A rib-shaped annular projection formed between the two annular grooves is positioned within the top plate thickness of the top plate of the battery lid, and a portion of the annular projection is recessed to form the rib in the remaining portion. did,
The lead acid battery according to claim 1.   The lead acid battery according to claim 1 or 2, wherein the rib is positioned over 30% or more of the top plate thickness of the top plate of the battery lid.   The distance from the central axis of the bushing to the outer peripheral surface of the rib is set to 124% to 133% of the length ½ of the terminal D dimension of the bushing. A lead acid battery according to any one of the above.   The lead acid battery according to any one of claims 1 to 4, wherein the rib is extended obliquely with respect to a vertical direction in a range of 90 degrees to 60 degrees with a horizontal plane as a reference of 0 degrees.   The lead storage battery according to any one of claims 1 to 5, wherein a concave portion is formed on a peripheral surface of a bowl-shaped annular protrusion formed between each of the annular grooves.

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