JP2003007281A - Lead storage battery - Google Patents

Abstract

(57) [Problem] To provide a lead storage battery capable of reducing the amount of lead used for a pole while avoiding fusing of the pole during a large current discharge. SOLUTION: A protrusion 6 of a lead bushing 6 provided on a lid 5 is provided.
The terminal portion 8 is formed by connecting the tip of the pole 3 to the b by welding. A plurality of protruding ribs 10 protrude from the outer periphery of the pole 3 and are brought into contact with the inner wall 6 c of the lead bushing 6.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lead storage battery.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show the structure of the main part of a conventional lead storage battery. FIG. 3 is a longitudinal sectional view of the main part of a conventional lead storage battery, and FIG. 4 is used for the conventional lead storage battery. It is a perspective view of a pole.

In the conventional lead-acid battery, the ears 1 of each polar plate of the polar plate group (not shown) are connected by a strap 2, and a conical columnar pole 3 is integrally erected on the strap 2. ing. The electrode plate group is housed together with the electrolytic solution 4 in a battery case (not shown). In this state, the lower part of the pole 3 is also in the electrolytic solution 4. The upper part of the battery case is closed by a lid 5. A lead bushing 6 is integrally attached to the lid 5 by embedding a tubular lower portion 6a thereof. The lead bushing 6 has a structure in which a cylindrical lower portion 6a and a conical cylindrical protruding portion 6b are integrally provided upright. The upper end of the pole 3 is fitted in the lead bushing 6 and the welding portion 7 is attached to the protrusion 6b.
And the terminal portion 8 is formed.

In such a lead-acid battery, Joule heat is generated due to ohmic loss of the conductor during discharge. Therefore, when a large current required for starting the engine of an automobile is taken out, if the conductor does not have a cross-sectional area capable of withstanding the generated Joule heat, the conductor will melt.

Conventionally, the part where the Joule heat generated during high-current discharge is difficult to be dissipated and is most likely to generate heat is the pole 3 which is not in contact with the electrolytic solution 4 and cannot benefit from the cooling by the electrolytic solution 4.
Is the tip portion 3a of. In consideration of castability, the pole 3 has a structure in which the root is thick and becomes thinner toward the tip, so that the tip 3a of the pole 3 has the smallest cross-sectional area.
Since the lead bushing 6 forming the terminal portion 8 of the lead storage battery plays a role of a heat radiator, the portion slightly below the welded portion 7 where the lead bushing 6 and the pole 3 are connected by welding has the largest heat generation, It becomes the fusing part 9. Therefore, a design has been made to secure the required amount of cross-sectional area of the pole 3 in this portion.

[0006]

However, in the above-mentioned conventional pole column design, the pole column 3 which produces the most heat during large current discharge is used.
Since the design is made to secure the cross-sectional area of this part so that the part of No. 3 does not melt, there is a problem that the lead amount of the entire pole 3 increases.

An object of the present invention is to provide a lead storage battery capable of reducing the amount of lead used in the poles while avoiding the blowout of the poles during high current discharge.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a lead storage battery having a terminal portion in which the tip of a pole is welded to a protruding portion of a lead bushing provided on a lid.

In the lead acid battery of the present invention, the protruding rib is provided on the outer periphery of the pole. It is preferable that the protruding rib is in contact with the inner wall of the lead bushing. Also, the protruding rib is
It is preferably provided along the longitudinal direction of the pole.

In such a lead storage battery, since protruding ribs are provided on the outer periphery of the poles, Joule heat generated in the poles during large current discharge can be radiated through these ribs. Therefore, it is possible to extend the fusing time in which the lower portion of the welded portion with the lead bushing is fused at the upper end of the pole. In addition, the amount of lead used for the poles can be reduced.

When the protruding rib is in contact with the inner wall of the lead bushing, the heat radiation efficiency can be further improved.

Further, when the protruding ribs are provided along the longitudinal direction of the pole column, the heat dissipation of the pole column can be more efficiently performed along the longitudinal direction of the pole column.

[0013]

1 and 2 show an example of an embodiment of a lead-acid battery according to the present invention. FIG. 1 is a longitudinal sectional view of a main part of a lead-acid battery of this example, and FIG. It is a perspective view of the pole used in the example lead acid battery. The parts corresponding to those in FIGS. 3 and 4 described above are denoted by the same reference numerals.

In the lead-acid battery of this example, as shown in FIG.
A plurality of protruding ribs 10 are radially provided on the outer periphery of the protruding rib 10. These protruding ribs 10 are in contact with the tapered inner wall 6c of the lead bushing 6g. The protruding ribs 10 are provided along the longitudinal direction of the pole 3.

In such a lead storage battery, since the protruding ribs 10 are provided on the outer circumference of the poles 3, the Joule heat generated in the poles at the time of discharging a large current is radiated through these ribs 10. be able to. Therefore, it is possible to extend the fusing time in which the lower portion of the welded portion 7 with the lead bushing 6 is fused at the upper end of the pole 3. Moreover, the amount of lead used for the poles 3 can be reduced.

When these protruding ribs 10 are in contact with the inner wall of the lead bushing 6, the heat radiation efficiency can be further improved.

Further, when the protruding rib 10 is provided along the longitudinal direction of the pole 3, the heat dissipation of the pole 3 can be more efficiently performed along the longitudinal direction of the pole 3.

[0018]

EXAMPLE One example of the present invention will be described in comparison with a conventional example.

The structure of the conventional pole 3 shown in FIG. 4 (height H:
75mm, Diameter of pole bottom φY: 13mm, Diameter of pole tip φ
(X: 10 mm), at the time of high current discharge of 800 A, the pole column tip portion 3a was fused in about 40 seconds.

On the other hand, the pole 3 used in this example shown in FIG.
Has a trapezoidal cross section from the pole tip to the pole bottom (upper bottom W1: 1 mm, lower bottom W2: 1.5 mm, height h: 2 m
As shown in FIG. 1, the projecting ribs 10 of (m) are evenly projected in the longitudinal direction of the pole 3 so that the projecting ribs 10 and the inner wall 6c of the lead bushing 6 come into contact with each other, resulting in a large current discharge of 800 A. Since the Joule heat generated at some time was radiated to the lead bushing 6 through the protruding rib 10, the fusing time of the pole 3 was about 50 seconds.

In the structure of the conventional pole column 3, in order to achieve the same fusing time as in this example, the diameter of the bottom of the pole column is φY: 14 mm, and the diameter of the pole column tip is φX: 11 mm. Is about 16
g increased.

In the structure of the pole 3 of this example, the amount of lead is increased by about 8 g, and the amount of lead used for the pole 3 can be reduced by about 8 g.

[0023]

In the lead-acid battery according to the present invention, the projecting ribs are provided on the outer periphery of the pole column so that the Joule heat generated in the pole column at the time of discharging a large current can be radiated through these projecting ribs. it can. Therefore, it is possible to extend the fusing time in which the lower portion of the welded portion with the lead bushing is fused at the upper end of the pole. In addition, the amount of lead used for the poles can be reduced.

In the present invention, when the protruding rib is in contact with the inner wall of the lead bushing, the heat radiation efficiency can be further improved.

Further, when the protruding rib is provided along the longitudinal direction of the pole column, the heat dissipation of the pole column can be more efficiently performed along the longitudinal direction of the pole column.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an example of an embodiment of a lead storage battery according to the present invention.

FIG. 2 is a perspective view of a pole used in the lead storage battery of this example.

FIG. 3 is a longitudinal sectional view of a main part of a conventional lead storage battery.

FIG. 4 is a perspective view of a pole used in a conventional lead storage battery.

[Explanation of symbols]

1 ear 2 straps 3 poles 4 Electrolyte 5 lid 6 Lead bushings 6a lower part 6b protrusion 6c inner wall 7 welds 8 terminals 9 Fusing part 10 protruding rib

Claims (3)

[Claims] 1. A lead storage battery having a terminal portion in which a tip of a pole column is welded to a protrusion portion of a lead bushing provided on a lid, the lead storage battery having a protrusion rib on an outer periphery of the pole column. 2. The lead acid battery according to claim 1, wherein the protruding rib is in contact with an inner wall of the lead bushing. 3. The lead acid battery according to claim 1, wherein the protruding rib is provided along the longitudinal direction of the pole.