JPH0556624B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a terminal portion of a lead-acid battery.

Structure of conventional example and its problems Figure 1 shows the terminal structure of a conventional lead-acid battery, in which 1 is a battery case made of polypropylene resin;
2 is a lid made of polypropylene resin, and 3 is an electrode plate group (element) consisting of a positive electrode plate, a negative electrode plate, and a separator. Reference numeral 4 denotes a pole pole that connects the electrode plate group and the terminal portion. Reference numeral 5 denotes a lead alloy bushing inserted into the lid 2, and an output/input terminal 6 is integrally provided on the upper part. The terminal 6 and the bushing 5 are integrally molded and have a through hole in the center thereof.If the inside diameter of the through hole at the top of the terminal is a, and the inside diameter of the bottom of the bushing is b, then a<
B, but it was simply tapered to less than a1.2b. In this case, if a large current is discharged, the welded part between the terminal part and the bushing part and the pole pole will be overheated, and the polypropylene resin of the lid will melt from the joint between the bushing and the lid, or the pole pole 4 will be There were times when it melted. In addition, although not shown, there is also a method of integrating the bushing 5 and the terminal 6 later. This is done by insert-molding only the bushing 5 into the lid 2, inserting the pole post 4 into the through hole of the bushing, melting the upper ends of the pole post 4 and the bushing 5, and inserting the pole post 4 into the terminal-shaped jig provided on the bushing. Pour molten lead into the
This is solidified to form a terminal portion in which the terminal 6, pole post 4, and bushing 5 are integrated. This method shortens the flow of the pole column and has the characteristics of being relatively resistant to large currents because no through holes are provided in the terminal part, but the terminal part must be formed using a jig. This made the work complicated. Furthermore, when forming the terminal, molten lead corresponding to the volume of the terminal is poured into the upper part of the bushing 5 in a state sufficient to melt the upper end of the bushing 5 and the pole pillar 4, and the lid 2 is melted by the heat at this time.
This has disadvantages such as softening of the bushing and reducing the adhesion of the joint between the lid and the bushing 5.

OBJECTS OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a terminal structure having sufficient strength to withstand high current charging and discharging.

Structure of the Invention In order to achieve the above object, the present invention provides a terminal-equipped bushing in which a bushing having a through-hole in the center and a terminal are integrally formed of a lead alloy, and a terminal-equipped bushing that is fitted into the through-hole of the terminal-attached bushing to form a tip portion. is equipped with a pole post to be welded to the tip of the terminal, the inner diameter of the through hole of the bushing is at least 1.5 times the inner diameter of the through hole of the terminal, and the shape of the tip of the pole post is the diameter of the pole part that fits into the through hole of the bushing. of the diameter of the pole part that fits into the through hole of the terminal.
This is 1.5 times or more.

With such a configuration, the area of the bushing in contact with the lid is large, which improves heat dissipation, and since the pole portion fitted into the bushing is thick, it can be sufficiently resistant to melting.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the drawings. FIG. 2 is a diagram showing the terminal structure of a lead-acid battery according to an embodiment of the present invention. In the figure, numerals 1 to 4 are the same components as in the conventional example. 5 is a lead alloy bushing inserted into the lid 2, and 6 is a lead alloy terminal integrally formed with the bushing 5. Both the bushing 5 and the terminal 6 are formed with a through hole communicating with each other in the center. The inner diameter d of the through-hole in the bushing 5 at the portion of the through-hole where the bushing 5 and the terminal 6 are joined is configured to be at least 1.5 times the inner diameter c of the through-hole in the terminal 6.
In addition, the shape of the tip of the pole post 4 that fits into this through hole matches the inner shape of the through hole of the terminal 6 and the bushing 5, and the diameter f of the pole pole that fits into the bushing 5 is set to the diameter f of the pole pole that fits into the terminal 6. 1.5 times or more the diameter e. Such a pole post 4 is inserted and the upper end of the terminal 6 is melted and integrated to form a terminal. Also, Fig. 3 shows another embodiment of the present invention, in which the terminal shape is thick, the bushing 5 and the pole post 4 are used in common with the thin terminal shown in Fig. 2, and only the terminal 6 part is changed. A similar terminal structure can be obtained by simply using Next, the operation of the above configuration will be explained. As mentioned above, the significance of this configuration lies in the fact that the inner diameters of the terminal 6 and the bushing 5 are significantly different, and the dimensions of the terminal shape are specified in JIS-D5301, so the dimensions can be changed freely. I can't. However, as a result of considering productivity, so-called bushings with terminals, in which the terminals and bushings are integrated, as shown in the conventional example shown in FIG. 1, have been put into practical use. However, in that case, if a large capacity was taken out in a short period of time, the terminal part would generate heat and melt. This is because the bushings and terminals have a narrow surface area for heat dissipation, so they accumulate heat, reaching the melting temperature and blowing out, and because the poles are thin, the internal resistance increases, causing heat generation and high temperatures. The present invention increases the inner diameter of the bushing part without changing the prescribed shape of the terminal 6, and places the thick pole pole as close to the terminal part as possible, and also increases the outer diameter of the bushing to increase its surface area. , to obtain a heat dissipation effect. Also, the reason why the inner diameter of the bushing part b is 1.5 times or more larger than the inner diameter a of the terminal part is as shown in Figure 4. If b/a is 1 or more and less than 1.5 times,
Although the fusing resistance performance improves under large current discharge, no significant improvement can be expected. But b/a is 1.5
If the amount is more than double, the fusing resistance will be significantly improved.
1.5 times or more. As described above, according to this embodiment,
It does not require separate parts or separate work, does not impair the adhesion between the bushing and the lid, and has the effect of being excellent in resistance to fusing.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) A terminal structure that is strong against large current discharges can be obtained.

(2) A terminal structure with excellent fusing resistance can be obtained without changing the terminal dimensions based on JIS standards.

(3) Heat during welding between the top end of the terminal and the top end of the pole pole is also radiated from the surface of the bushing, so that the adhesion between the bushing and the lid is not impaired.

(4) It is possible to commercialize JIS standard thick terminals and thin terminals using the same pole.

(5) Since the pole pillars can be made thicker, electrical resistance can be lowered and discharge characteristics can be improved.

(6) The outer diameter of the bushing is also increased, which improves the twist resistance of the terminal.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the terminal section of a conventional lead-acid battery.
Fig. 2 is a longitudinal cross-sectional view of a terminal portion of a lead-acid battery according to an embodiment of the present invention, Fig. 3 is a cross-sectional view of a main part of a lead-acid battery according to another embodiment of the present invention, and Fig. 4 is a through-hole in the terminal portion. It is a figure which shows the relationship between the ratio of the inner diameter a and the through-hole inner diameter b of the bushing part, and the fusing resistance time. 5... Bushing, 6... Terminal, a... Inner diameter of through hole of terminal, b... Inner diameter of through hole of bushing, c...
The inner diameter of the terminal hole at the joint between the terminal and the bushing,
b...Inner diameter of the bushing through hole, e...Diameter of the terminal fitting part of the pole post, f...Diameter of the bushing fitting part of the pole post.

Claims (1)

[Claims] 1. A bushing with a terminal that has a through hole in the center and a terminal formed integrally with a lead alloy, and a pole pole that fits into the through hole of the bushing with a terminal and whose tip end is welded to the tip of the terminal. and the inner diameter of the through-hole of the bushing is 1.5 of the inner diameter of the through-hole of the terminal.
The shape of the tip of the pole pillar is such that the diameter of the pole part that fits into the through hole of the bushing is at least 1.5 times the diameter of the pole part that fits into the through hole of the terminal.