JP2001093509A - Lead battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead battery having terminals and electrolyte cell caps filled with a filler such as epoxy resin for preventing severing between the terminal and the filler layer to secure sealing, so that performance degradation due to leakage or poor sealing is prevented, thus improving reliability. SOLUTION: A metal terminal member 1 having a bolt 3 and nut 4 at one end is coated with a lead alloy layer 5, inserted into a hole 6a formed in the electrolytic cell cap 6. An opening formed around the hole 6a outward the electrolytic cell cap 6 is filled with a filler layer 7 to seal the gap between the electrolytic cell cap 6 and the metal terminal member 1. The lead alloy layer 5 is interposed between the filler layer 7 and the metal terminal member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lead-acid battery terminal according to the present invention.

[0002]

2. Description of the Related Art As one of the conventional terminal structures of a lead-acid battery, a lower part of a metal terminal member 11 made of a columnar copper or brass is embedded in a lead alloy 10 as shown in FIG. A terminal having a structure in which the top surface 11a of the metal terminal member 11 is exposed upward from the lead alloy 10 is used for a large-capacity lead-acid battery used by connecting lead-acid batteries. This structure is formed by casting a metal terminal member 11 into a lead alloy 10 for the main purpose of reducing the electric resistance of the terminal and forming a connection means with the outside such as the bolt 12 or the nut portion 13. Have been. The lower part of such a metal terminal member 11 is joined to a ledge where electrode plates are assembled and welded inside the battery case, and taken out of the lead-acid battery through a through hole 14 a provided in the battery case cover 14. Here, ensuring the sealing performance between the metal terminal member 11 and the battery case cover 14 is important for ensuring the reliability of the lead storage battery. The reason is that if the sealing performance of this part is impaired, the diluted sulfuric acid electrolyte leaks out of the lead-acid battery through the gap between the metal terminal member 11 and the through hole 14a of the battery case cover 14, or the sealed type This is because, in the case of a lead storage battery, the negative electrode plate is oxidized by the outside air entering through the gap, and the performance is significantly reduced. Therefore, the metal terminal member 1
As a means for ensuring the tightness between the battery terminal 1 and the battery case cover 14, it is common to seal the space between the metal terminal member 11 and the battery case cover 14 with a filler layer 15 of an epoxy resin material filled in an adhesive pot 14b. It is being done. In such a case, the metal terminal member 11 is generally sealed with the filler layer 15 so as to include a portion projecting upward from the lead alloy 10. A bolt 12 and a nut portion 13 for external connection are provided on a top surface 11a of the metal terminal member 11. For example, when connecting a lead storage battery to a lead storage battery, a connection plate 16 is inserted between terminals of the lead storage battery to be connected, and the connection plate 16 and the metal terminal member 11 are connected to the nut portion 13.
And bolts 12. In the lead storage battery having such a configuration, when the metal terminal members 11 are fixed in a state where the mutually connected lead storage batteries are displaced, stress is applied to the metal terminal members 11, and as a result, the metal terminal members 11 And the filler layer 15 are separated, and the sealing property between them may be impaired. In such a case, there has been a problem that a liquid leak occurs from the terminal portion of the lead storage battery as described above, and the performance of the lead storage battery is deteriorated.

[0003]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned problems of the prior art, prevents the formation of gaps and cracks between the metal terminal member and the filler layer, and has excellent reliability. It is intended to provide a lead storage battery.

[0004]

According to a first aspect of the present invention, there is provided a metal terminal member having a connection component including a bolt portion or a nut portion for screwing at one end. The metal terminal member is covered with a lead alloy layer that is softer and more easily deformable than the metal terminal member except for at least the connection component, and the metal terminal member is provided on a battery case lid. A lead-acid battery that has a filler layer that penetrates the through hole and has a function of ensuring adhesion between the battery case cover and the metal terminal member around the opening outside the battery case cover of the through hole, The lead storage battery is characterized in that the lead alloy layer is interposed between the filler layer and the surface of the metal terminal member.

According to a second aspect of the present invention, in the lead storage battery having the structure specified in the first aspect, the metal terminal member has a polygonal prism shape, and at least a portion covered with the lead alloy layer is notched. The lead storage battery is characterized in that a lead storage battery is provided.

According to a third aspect of the present invention, there is provided a lead-acid battery having the configuration specified in the first or second aspect, wherein the top surface of the metal terminal member except for the connection component has at least a lead alloy layer. The lead storage battery is characterized in that it is at the same position as the top surface or at a lower position.

According to a fourth aspect of the present invention, there is provided the lead-acid battery specified in any one of the first to third aspects, wherein the lead alloy contains 3.0% by weight or less of a lead alloy.
It is a tin alloy.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 is a diagram showing the configuration of a terminal section of a lead-acid battery according to an embodiment of the present invention. On the top surface 1a of the metal terminal member 1 made of brass, a nut portion 4 for screwing a bolt 3 for fixing the connection plate 2 connected to another lead storage battery to the metal terminal member 1 is provided. The metal terminal member 1 has a top surface 1a and a top surface 1a of the metal terminal member.
Except for the nut part 4 formed in the above, it is covered with a lead alloy layer 5 containing tin. This lead alloy layer 5 is an electrode plate ear (not shown).
Are connected to a shelf (not shown) for collective welding. The metal terminal member 1 whose surface is covered with the lead alloy layer 5 penetrates the battery case cover 6. An adhesive pot 6b is provided around a through hole 6a for penetrating the metal terminal member 1 of the battery case cover 6, and the adhesive pot 6b is filled with a filler layer 7 such as an epoxy resin. 6 and the metal terminal member 1 are secured tightly. According to the present invention, the metal terminal member 1 made of brass does not directly contact the filler layer 7, but only the lead alloy layer 5 contacts the filler layer 7, and the battery case lid 6 and the metal terminal member 1 Sealing is secured. According to such a configuration, when the connection plate 2 is fixed to the metal terminal member 1 by screwing the bolt 3 into the nut portion 4, the connection plate 2 is not connected to the metal terminal member due to the positional relationship of another storage battery to be connected. Even when the member 1 is pulled or pushed, the force is reduced by the lead alloy layer 5. That is, the generation of a gap between the lead alloy layer 5 and the filler layer 7 due to the compression deformation of the lead alloy layer 5 can be suppressed. It is desirable that the lead alloy layer 5 be easily deformed by such stress from the connection plate 2. Therefore, the tin concentration in the lead alloy is preferably less than 3.0% by weight. If the tin concentration in the lead alloy exceeds 3.0% by weight, the hardness of the lead alloy layer 5 increases, and the effect of the lead alloy layer 5 to relieve stress decreases. In the configuration of the present invention, the top surface 1a of the metal terminal member is provided.
Is preferably provided below the top surface 5a of the lead alloy layer. According to such a configuration, the connection plate 2 is fixed to the metal terminal member 1 by the bolts 3 while being in contact with the lead alloy layer 5. In this case, the lead alloy layer 5 easily undergoes compressive deformation due to the combination of the alloy compositions, and the connection between the connection plate 2 and the metal terminal member 1 is improved because the adhesion between the connection plate 2 and the lead alloy layer 5 is improved. It is possible to reduce the contact resistance. Further, since the connection plate 2 and the lead alloy layer 5 are closely adhered to each other, it is possible to suppress the bolt 3 from being loosened from the nut portion 4. A notch 8 as shown in FIG. 2 is provided in a portion of the metal terminal member 1 covered with the lead alloy layer 5, and the cross-sectional structure of the metal terminal member 1 is changed to a triangular prism, a quadrangular prism, or a hexagon. By making the shape of a pillar or a polygonal pillar such as an octagonal pillar, the metal terminal member 1 can be prevented from falling off or rotating from the lead alloy layer 5.

(Comparison of Performance) The lead storage battery described in one embodiment of the present invention and the conventional lead storage battery shown in FIG. 3 are connected by connecting plates, and stress is applied to the connecting plates in the horizontal direction. In addition, the presence or absence of peeling between the terminal and the epoxy resin filler layer when displaced from 0.2 mm to 3.0 mm was examined. The results are shown in Table 1 (the displacement of the terminals during actual installation work is 1 mm or less).

[0011]

[Table 1]

From the results shown in Table 1, it can be confirmed that the configuration of the present invention can prevent the metal terminal member from being separated from the filler layer. According to the configuration of the present invention, even when a stress that displaces the metal terminal member is applied, the separation between the metal terminal member and the filler layer can be suppressed because the lead alloy layer acts as a buffer. all right. Further, in one embodiment of the present invention described above, lead-
Although a 2.0 wt% tin alloy was used, it was confirmed that the tin concentration in the lead alloy was appropriately 3.0 wt% or less in order for the lead alloy layer to relax the stress as a buffer. It has been found that when the tin concentration exceeds 3.0% by weight, the strength of the lead alloy increases and the effect as a buffer material decreases.

[0013]

As described above, according to the present invention, the sealing between the terminal portion and the battery case lid can be ensured by suppressing peeling occurring between the terminal portion and the surrounding filler layer. As a result, it is possible to provide a lead-acid battery having excellent reliability by suppressing liquid leakage and deterioration in the performance of the lead-acid battery due to a decrease in the liquid-tightness and air-tightness of the terminal portion, which is industrially useful.

[Brief description of the drawings]

FIG. 1 is a sectional view of a terminal portion of a lead storage battery according to an embodiment of the present invention.

FIG. 2A is a top view showing the shape of a metal terminal member, and FIG.

FIG. 3 is a cross-sectional view of a terminal portion of a conventional lead-acid battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal terminal member 1a Top surface of metal terminal member 2 Connection plate 3 Bolt 4 Nut part 5 Lead alloy layer 5a Top surface of lead alloy layer 6 Battery case lid 6a Through hole 6b Adhesive pot 7 Filler layer 8 Notch

Continued on the front page F term (reference) 5H022 AA01 BB02 BB22 CC03 CC08 CC09 EE02 EE10 5H028 AA07 BB04 BB10 CC05 CC08 CC20 EE01 HH01

Claims (4)

[Claims] A metal terminal member having a connection component including a bolt or nut portion for screwing at one end;
The metal terminal member is covered with a lead alloy layer that is softer and easier to deform than the metal terminal member except for at least the connection component, and the metal terminal member has a through hole provided in a battery case lid. A lead-acid battery that has a filler layer that penetrates and secures adhesion between a battery case lid and the metal terminal member around an opening outside the battery case lid of the through hole, wherein the filler layer and the metal The lead-acid battery, wherein the lead alloy layer is interposed between the lead-acid battery and a surface of the terminal member. 2. The lead-acid battery according to claim 1, wherein the metal terminal member has a polygonal column shape, and a cutout portion is provided in at least a portion covered with the lead alloy layer. 3. The lead according to claim 1, wherein the top surface of the metal terminal member excluding the connection component is at least at the same position as the top surface of the lead alloy layer or at a lower position. Storage battery. 4. The lead-acid battery according to claim 1, wherein the lead alloy layer is a lead-tin alloy containing less than 3.0% by weight of tin.