JP3815561B2 - Storage battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage battery having a feature in a terminal portion, and more particularly to a sealed storage battery.
[0002]
[Prior art]
In recent years, the number of batteries having bolts, nuts, and the like at the terminal portions of the storage battery is increasing in order to facilitate the installation of the storage battery. For example, Patent Document 1 describes a terminal having a structure in which a terminal member having a screw hole is fitted to a terminal portion at an upper part of a shelf to which an electrode plate is connected.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-245762 (FIGS. 3 and 2)
[0004]
FIG. 3 is a perspective view showing a structure of a first terminal member according to a conventional lead storage battery, and FIG. 4 is a sectional view of the vicinity of a terminal of the lead storage battery using the terminal member of FIG.
[0005]
In FIG. 4, the ear | edge part 103 of the electrode plate of each cell in a battery case is joined to the shelf part of the 2nd terminal member 102 made from lead alloy which embedded the 1st terminal member 101 made from copper in the head. . On the other hand, a lead alloy bushing 105 for fitting the second terminal member 102 is formed in advance on the battery case lid 104 serving as a lid of the lead storage battery. Therefore, after joining the 2nd terminal member 102 with which the 1st terminal member 101 was embed | buried to the ear | edge part 103 of the electrode plate of each cell, respectively, by covering the battery case cover 104 on a battery case (not shown). The second terminal member 102 is fitted to the bushing 105.
[0006]
At this time, the first terminal member 101 is exposed on the battery case lid 104. After bonding to the battery case lid 104 (not shown), the head portion of the second terminal member 102 and the bushing 105 are heated by a burner and welded to form a welded portion 106, thereby forming the welded portion 106. Secure to. Sealing is performed by injecting a filler 107 such as an epoxy resin from the upper portion of the welded portion 106 and curing it.
[0007]
As shown in FIG. 3, the first terminal member 101 includes an upper large-diameter portion 111 and a lower small-diameter portion 112, and the large-diameter portion 111 has a screw portion 113 on the top surface thereof, and has a small-diameter portion. Reference numeral 112 is embedded in the second terminal member 102 made of a lead alloy. The small-diameter portion 112 is provided with a pair of opposed notches 114 for preventing rotation. Prior to embedding the first terminal member 101 in the second terminal member 102, the first terminal member 101 is solder-plated to improve the familiarity with the lead alloy (weldability with the lead alloy). It is.
[0008]
In order to embed the first terminal member 101 in the second terminal member 102, an insert for forming the second terminal member 102 by pouring a lead alloy dissolved in a mold on which the first terminal member 101 is supported. Molding is generally performed.
[0009]
[Problems to be solved by the invention]
However, in the small-diameter portion 112 of the first terminal member 101 provided with the non-rotating cutout 114 as shown in FIG. 3, there are many corners in the small-diameter portion 112 of the first terminal member. Therefore, the lead alloy is not reliably formed according to the shape of the terminal member 101 due to the viscosity of the melted lead alloy. It is easy to cause a so-called hot water defect. If this hot water defect occurs, the first terminal member and the second terminal member are liable to cause poor contact, and the conductivity from the terminal to the electrode is deteriorated, so that a certain quality cannot be maintained.
[0010]
The first terminal member 101 and the second terminal member 102 are made of metals having different melting points. This is to prevent the first terminal member 101 from being deformed when a melted metal is poured into a mold in which the first terminal member is set for insert molding. For this reason, the first terminal member 101 and the second terminal member 102 use metals having different electrical conductivities, and uneven electrical conduction from the terminal to the electrode tends to occur. In addition, since the small-diameter portion 112 of the first terminal member 101 is not equidistant from the central axis due to the notch 114 for preventing rotation of the first terminal member, uneven electrical conduction from the terminal to the electrode occurs. , Conductivity efficiency is not good.
[0011]
The present invention has been made to solve such problems of the prior art, and an object of the present invention is to provide a storage battery having a terminal that retains a rotation preventing function without impairing the conductive efficiency.
[0012]
[Means for Solving the Problems]
The storage battery according to the present invention is a storage battery including a terminal portion whose top surface is exposed to the outside from the battery case lid, and the terminal portion includes a screw portion on the top surface, and is a metal first electrode that obtains conductivity. A terminal member and a metal second terminal member welded to an ear portion of the electrode plate, wherein the first terminal member includes a leg portion embedded in the second terminal member and the second terminal. A head that is not embedded in the member, and the head includes a detent means.
[0013]
According to the storage battery of the present invention, the terminal portion of the storage battery is formed by embedding the leg portion of the first terminal member in the second terminal member, and the top surface of the first terminal member including the screw portion is formed. It will be exposed from the battery case lid of the storage battery. Further, a detent means is provided on the head of the first terminal member that is not embedded in the second terminal member.
[0014]
Accordingly, the anti-rotation means is joined to the second terminal member while ensuring the function of anti-rotation by providing the anti-rotation means on the head of the first terminal member that is not the junction with the second terminal member. It is not necessary to provide in the leg part of the 1st terminal member which is a part. Thereby, when the leg portion of the first terminal member is embedded in the second terminal member, the flow of the molten metal melted by the detent means is not hindered, and the metal flows smoothly. It is possible to prevent deterioration of the conductive efficiency in the terminal portion due to poor flow of molten metal, and to keep the quality of the storage battery constant.
[0015]
Further, in the storage battery according to the present invention, the shape of the leg portion of the first terminal member, which is a joint portion with the second terminal member, can be formed at an equal distance with respect to the central axis of the first terminal member. Since it is possible, it is difficult to cause uneven electrical conduction and the conduction efficiency can be improved.
[0016]
The screw portion provided on the top surface of the first terminal member may be a female screw opened on the top surface, or a male screw provided above the top surface of the first terminal member. Also good.
[0017]
An example of the storage battery is a lead storage battery. Further, for example, copper or a copper alloy can be used for the first terminal member, and for example, lead or a lead alloy can be used for the second terminal member.
[0018]
The first terminal member is preferably configured to include a retaining means on the leg portion. According to this configuration, it is possible to prevent the first terminal member from falling off the second terminal member.
[0019]
The rotation preventing means is preferably configured to have an asymmetric outer shape with respect to the central axis of the threaded portion of the first terminal member. According to such a configuration, the anti-rotation means can be formed without using other members, and therefore the first terminal member can be manufactured with a small number of parts. Here, as the asymmetric shape with respect to the central axis of the threaded portion, all shapes that are not perfect circles such as hexagons and ellipses, and a perfect circle in which the center of the circle is shifted from the central axis of the threaded portion may be applied. Is possible.
[0020]
Preferably, the detent means is fixed by a resin filled in a gap between the battery case lid and the first terminal member. According to such a configuration, it is possible to cause the resin for sealing the formed terminal portion and the battery case lid to have both functions of sealing and non-rotating simultaneously, and it is possible to easily manufacture a storage battery. Here, as the resin, an epoxy resin can be applied.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, taking the case of a lead storage battery as an example. Fig.1 (a) is a perspective view which shows the structure of the 1st terminal member of the lead acid battery which concerns on one Embodiment of this invention, Fig.2 (a) shows the 1st terminal member shown in FIG. It is sectional drawing of the terminal part vicinity of the used lead acid battery.
[0022]
As shown in FIG. 2 (a), the ear portion 3 of the electrode plate of each cell in the battery case is a second lead-made lead alloy in which the first terminal member 1 made of copper shown in FIG. The terminal member 2 is welded to the shelf. As described above, the metal of the first terminal member 1 and the metal of the second terminal member 2 are such that the melting point of the metal of the second terminal member 2 is lower than the melting point of the metal of the first terminal member 1. It is desirable to be a conductive metal.
[0023]
The reason why lead or a lead alloy is used as the metal of the second terminal member 2 is that, in the case of a lead storage battery, the ear portion 3 of the electrode plate of each cell is made of lead or a lead alloy, so that matching with it.
[0024]
In addition, the use of a metal having a melting point higher than that of the second terminal member as the metal of the first terminal member 1 is such that the top surface is exposed to the outside and the bonding strength with the mating terminal is ensured. Achieved the purpose of not melting the first terminal member 1 when the metal for the second terminal member 2 melted for the insert molding described later is poured into the mold holding the first terminal member. This is because a metal having good electrical conductivity is required as a terminal.
[0025]
On the other hand, a lead alloy bushing 5 for fitting the second terminal member 2 is formed in advance on the battery case lid 14 of the lead storage battery. Therefore, after welding the 2nd terminal member 2 with which the 1st terminal member 1 was each embed | buried in the ear | edge part 3 of the electrode plate of each cell, the battery case cover 4 is covered with a battery case (not shown). The second terminal member 2 is fitted to the bushing 5.
[0026]
At this time, the top surface of the first terminal member 1 is exposed on the battery case lid 4. After the battery case lid 4 is bonded to the battery case (not shown), the head of the second terminal member 2 and the bushing 5 are heated by a burner and welded to form the welded portion 6. Thereby, the terminal portion 8 is fixed to the battery case lid 4. A filler 7 such as an epoxy resin is injected from the upper part of the welded portion 6, and the resin is cured to be sealed, thereby preventing the electrolytic solution in the battery case from seeping out. Here, the head portion 11 of the first terminal member may be formed so as to protrude from the battery case lid 4 as shown in FIG.
[0027]
The 1st terminal member 1 is comprised by the head part 11 of the 1st terminal member, and the leg part 12 of the 1st terminal member, as shown to Fig.1 (a). The head portion 11 of the first terminal member has a screw hole as a screw portion 13 on the top surface.
[0028]
Further, the head 11 of the first terminal member is provided with a detent means having a hexagonal cross section. The anti-rotation means has a first terminal together with the mating terminal when the mating terminal is screwed to the screw portion 13 by fixing the periphery with a filler such as an epoxy resin which is a curable resin. The member 1 is prevented from rotating. As shown in FIG. 1A, the head portion 11 of the terminal member is thicker than the leg portion 12, and the distance from the central axis of the screw portion 13 on the side surface of the head portion is larger than the distance from the central axis of the screw portion on the side surface of the leg portion. Is also big. Therefore, in the storage battery in which the rotation prevention means is provided on the head like the storage battery according to the present invention, the screw portion is compared to the battery in which the rotation prevention means is provided in the leg portion shown in FIG. 4 as an example of the conventional battery. There is an advantage that the applied torque can be received with a smaller force. In the case of the storage battery according to the present invention, even if a rotational torque is applied to the screw portion, it is possible to prevent or significantly reduce the external force from being applied to the joint surface between the terminal member 1 and the terminal member 2.
[0029]
Note that the cross-sectional shape of the anti-rotation means does not have to be a hexagon as shown in FIG. 1A, and may be a perfect circle as long as the central axis of the screw portion 13 and the central axis of the anti-rotation means are misaligned. The function as a detent means can be achieved, and the function as the detent means can be achieved regardless of the position with respect to the central axis of the screw portion 13 as long as it is polygonal or elliptical.
[0030]
The leg 12 of the first terminal member is embedded in the second terminal member 2 made of lead alloy as shown in FIG. This is formed by insert molding for forming the second terminal member 2 by pouring a molten lead alloy into a mold on which the first terminal member 1 is supported. Prior to embedding the first terminal member 1 in the second terminal member 2, soldering is applied to the first terminal member 1 to improve the familiarity with the lead alloy (weldability with the lead alloy). It is.
[0031]
As described above, the rotation preventing means is provided in the head portion 11 of the first terminal member, and is not provided in the joint portion between the first terminal member 1 and the second terminal member 2, so that the leg of the first terminal member is provided. The shape of the part 12 can be formed smoothly. For this reason, it is possible to prevent poor hot water when the second terminal member 2 is formed. As described above, it is possible to form the terminal portion 8 having a function of preventing rotation and having no contact failure, and the quality of the storage battery can be kept constant without impairing conductivity.
[0032]
Further, since the leg portion 12 of the first terminal member, which is a joint portion with the second terminal member 2, can be formed symmetrically with respect to the central axis of the terminal member 1, uneven electrical conduction is less likely to occur. Efficiency can be improved.
[0033]
The leg portion 12 of the first terminal member is turned into a shape as shown in FIG. 1, that is, a shape having step portions having different diameters (the lower end portion of the leg portion 12 is thickened: the retaining portion 14). The first terminal member 1 can also function as a retaining means for preventing the first terminal member 1 from falling off the second terminal member 2.
[0034]
The first terminal member 1 as described above is formed by forming the leg portion 12 of the first terminal member by lathe processing while leaving a part thereof from the square bar steel such as the hexagonal bar steel as the tail 11 of the first terminal member. Alternatively, the leg portion 12 of the first terminal member 1 may be formed from a round steel bar by lathe processing, and the head portion 11 of the first terminal member serving as a detent means may be formed by plane processing. When producing the 1st terminal member 1 from hexagonal steel bar, since it can produce in one work process, work efficiency can be improved and production cost can be reduced.
[0035]
The screw portion provided on the top surface of the first terminal member may be a female screw opened on the top surface as shown in FIG. 1 (a), or as shown in FIG. 1 (b) as described above. In addition, the screw portion 13 ′ may be a male screw provided above the top surface of the drawing.
[0036]
FIG.2 (b) is sectional drawing of the terminal part vicinity of the lead acid battery using 1st terminal member 1 'shown in FIG.1 (b). As shown in FIG. 2B, even when the first terminal member 1 ′ is used, the terminal portion can have a structure substantially similar to that shown in FIG. Further, in the case of a lead-acid battery terminal using the first terminal member 1 ′ shown in FIG. 1B, the head 11 ′ of the first terminal member is also used in the same manner as the terminal shown in FIG. The function of detent is given by making it square. Further, as in FIG. 2A, a retaining portion 14 'is provided at the lower end of the leg portion 12'.
[0037]
FIG. 5 is a cross-sectional view of the vicinity of the terminals of the storage battery according to the embodiment of the present invention. In the example shown in FIG. 5A, the terminal member 1 becomes thicker toward the head 11 (upward in the drawing) at the stepped portion at the boundary between the head 11 and the leg 12 of the first terminal member 1. A taper 15 having an inclination is provided. Further, in the example described in FIG. 5B, the cross-sectional shape of the step portion at the boundary between the head portion 11 and the leg portion 12 of the first terminal member 1 is inwardly convex when viewed from the first terminal member 1. The shape is a substantially arc shape 16.
[0038]
As described above, the terminal portion 8 is formed by setting the terminal member 1 in a mold and pouring molten metal made of lead or a lead alloy (insert molding). The molten metal is poured from the lower side of the drawing, but when the molten metal is poured in the case where the step at the boundary between the head 11 and the leg 12 of the terminal member 1 has an angular shape as in the embodiment shown in FIG. In addition, there is a possibility that a gas pool may be generated without the air in the corner portion of the terminal member 1 recessed at a substantially right angle. If the gas reservoir is generated, the bonding between the terminal member 1 and the terminal member 2 may be deteriorated, leading to a decrease in the conductive efficiency. According to the embodiment described in FIG. 5A and FIG. 5B, the possibility of generating a gas reservoir can be eliminated, which is a preferable embodiment. Further, in order to make the flow of the molten metal smoother, a taper 15 'may be provided at the upper stepped portion or the lower corner portion of the stopper portion 14 as shown in FIGS. 5 (a) and 5 (b). It is also effective to make the cross section substantially arc-shaped 16 ′.
[0039]
In the present invention, the inclination of the taper and the size of the radius of the arc are not particularly limited. However, in order for the molten metal to flow smoothly, the side surface of the portion provided with a taper or a substantially arc shape is the vertical axis in the figure. It is preferable to stand in the direction. Note that the stepped portion of the first terminal member 1 shown in FIGS. 5A and 5B is tapered or substantially arc-shaped so that the top portion shown in FIG. 2B has a male screw. The same applies to the terminal member.
[0040]
In the step of insert molding the terminal portion 8, instead of the method of performing solder plating on the surface of the terminal member 1 as described above, the terminal member 1 is joined to the terminal member 2 when the terminal member 1 is set in a mold. Applying, for example, flux on the surface (the surface of the leg portion 12) is an effective method for preventing the metal on the bonding surface from being oxidized and bonding the terminal member 1 and the terminal member 2 well. .
[0041]
【The invention's effect】
According to the storage battery of the first aspect of the present invention, the anti-rotation means is provided on the head of the first terminal member that is not the joint with the second terminal member, thereby ensuring the anti-rotation function. It is not necessary to provide the stopping means on the leg portion of the first terminal member that is the joint portion with the second terminal member. Thereby, when embedding the leg portion of the first terminal member in the second terminal member, the flow of the molten metal melted by the detent means is not hindered, and the molten metal flows smoothly, It is possible to prevent deterioration of the conductive efficiency in the terminal portion due to poor flow of molten metal, and to keep the quality of the storage battery constant.
[0042]
According to the storage battery of the second aspect of the present invention, the first terminal member can be prevented from falling off by the retaining means provided on the leg portion of the first terminal member.
[0043]
According to the storage battery according to claim 3 of the present invention, the function of preventing rotation can be imparted without limiting the shape of the head of the terminal member 1, so that the degree of freedom in designing the terminal portion is expanded.
[0044]
According to the storage battery according to claim 4 of the present invention, it is easy to manufacture the storage battery, and when the rotation torque is applied to the first terminal member, the first terminal member and the second terminal member are joined. It is possible to prevent or significantly reduce the external force applied to the part.
[0045]
According to the storage battery according to claim 5 of the present invention, it is possible to prevent a gas reservoir from being generated on the joint surface between the terminal member 1 and the terminal member 2, and to favorably join both the terminal members to increase the conductive efficiency.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure of a first terminal member of a lead storage battery according to an embodiment of the present invention.
2 is a cross-sectional view of the vicinity of a terminal of a lead-acid battery using the first terminal member shown in FIG.
FIG. 3 is a perspective view showing a structure of a first terminal member according to a conventional lead-acid battery.
4 is a cross-sectional view of the vicinity of a terminal of a lead storage battery using the terminal member of FIG.
FIG. 5 is a cross-sectional view of the vicinity of a terminal of a storage battery according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1 '1st terminal member 2 2nd terminal member 4 Battery case lid 7 Filler 8 Terminal part 11, 11' Head part 12, 12 'of 1st terminal member Leg part 13 of 1st terminal member , 13 'Screw part 14, 14' Retaining part 15 Taper 16 Cross section substantially arc-shaped part

Claims (4)

A storage battery comprising a terminal portion whose top surface is exposed to the outside from the battery case lid, the terminal portion having a screw portion on the top surface, and a metal first terminal member for obtaining conductivity, and an electrode plate of a metal of the second terminal member is welded to the ears, the first terminal member, said second head which is not embedded in the leg portion and the second terminal member being embedded in the terminal member And a detent means on the head.   The storage battery according to claim 1, wherein the first terminal member is provided with a retaining means at a leg portion. The storage battery according to claim 1 or 2 , wherein the rotation preventing means is fixed by a resin filled in a gap between the battery case lid and the first terminal member. The storage battery according to any one of claims 1 to 3 , wherein a cross-sectional shape of a step portion at a boundary between the head portion and the leg portion of the first terminal member is tapered or substantially arc-shaped.

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