JPH10340716A - Cover terminal of thermal battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of a short circuit caused by heat generation of a thermal batter by forming a screw part in a projection part to the outside of a cover main body, and screwing a terminal stopping fixture to the screw part via a crimp-style terminal. SOLUTION: In a thermal battery, the tip of a lead wire 7 from an outside circuit is crimped to a crimp-style terminal 8, and a bolt 3 is screwed in a screw hole 2b of a nut part 2a of a cover terminal 2 through the crimp-style terminal 8 to connect the cover terminal 2 to the outside circuit. When the bolt 3 is screwed, a wrench is locked to the nut part 2a of the cover terminal 2 to stop rotation. The cover terminal 2 connected to the lead wire 7 is resin molded with a silicone rubber or the like for insulation protection. Since the lead wire 7 from the outside circuit is screwed to the cover terminal 2 via the crimp-style terminal 8, a there is no possibility of short circuit due to melting out of solder by heat generated in the thermal battery, unlike the soldering connection, is not produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover terminal which is attached to a cover body of a thermal battery and electrically connects an internal lead in the battery to an external circuit.

[0002]

2. Description of the Related Art A thermal battery is a primary battery which uses an inorganic salt which is an electrically conductive solid at room temperature during storage and becomes conductive by melting when heated during use of the battery.
It has a feature that it can be stored for a long time and can take out a large current in a short time, and is used as a power source in an emergency or the like.

In this thermal battery, a plurality of cover terminals 2 are attached to a cover body 1 as shown in FIG. 3, for example, for connection to an external circuit. As shown in FIG. 4, a conventional cover terminal 2 has a lead-shaped soldered portion 2d having a slightly reduced diameter formed on an upper portion of a pin-shaped conductive metal rod, and a lower portion pressed to form a flat blown surface 2c. It was done. Each cover terminal 2 is connected to the cover body 1
The hermetic glass 4 is attached by inserting into the through-hole 1a formed in the above and sealing the pin-shaped substantially central portion with the hermetic glass 4. Further, the tip of the internal lead 6 pulled out from the power generation unit 5 is spot-welded to the crushed surface 2c, thereby being connected to the positive electrode and the negative electrode of the power generation unit 5. Some of these cover terminals 2 are connected to internal leads (not shown) for igniting the ignition balls of the power generation unit 5.

Each of the cover terminals 2 is formed by winding the tip of a lead wire 7 from an external circuit around a lead wire soldering portion 2 d protruding from the cover body 1 and soldering.
It is connected and fixed to this external circuit.

[0005]

However, thermal batteries are
When the ignition ball is ignited during use and the heat plate of the power generation unit 5 generates heat, the temperature rises to about 300 ° C. However, since the heat insulating material is arranged in the upper part of the power generation unit 5, the heat of the heat plate is not transmitted to the cover body 1 immediately. However, when the heat generation of the heat plate is continued to some extent and the end of use of the thermal battery is reached, the temperature of the cover body 1 may exceed the melting temperature of the solder of 180 to 220 ° C. depending on temperature conditions such as the environment, In such a case, as shown in FIG.
The solder 9 for connecting and fixing the lead wire 7 to the lead wire soldered portion 2d is melted, and the cover terminal 2 may be electrically connected to the stainless steel cover body 1. Such a phenomenon is a case where the terminal portion is not molded, and there is no problem if the terminal is molded.

Therefore, conventionally, the positive and negative cover terminals 2
When the solder 9 for connecting and fixing the lead wire 7 melts due to the heat generated by the thermal battery and flows out into the cover body 1, there is a problem that the positive and negative cover terminals 2 may be short-circuited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a cover which does not cause a short circuit due to heat generation of a thermal battery by screwing a crimp terminal to which the tip of a lead wire is crimped. It is intended to provide terminals.

[0008]

That is, in order to solve the above-mentioned problems, the present invention provides a cover terminal attached to a cover body of a thermal battery and electrically connecting an internal lead in the battery to an external circuit. , A screw portion is formed at a protruding portion of the cover body to the outside, and a terminal stopper attached to the screw portion via a crimp terminal is provided.

According to the means, the terminal fastener is screwed to the screw portion of the cover terminal via the crimp terminal. Therefore, if the tip of the lead wire is crimped to the crimp terminal, soldering is not performed. The lead wire and the cover terminal can be connected. Therefore, even if the thermal battery becomes hot due to heat generation,
There is no danger that the solder of the cover terminal will melt out and cause a short circuit.

The screw portion is a screw hole or a male screw formed in a protruding portion of the cover main body, and the terminal stopper is screwed into a male screw or a male screw screwed into the screw hole. It has a screw hole to be attached.

According to the means of (1), since a screw hole or a male screw is formed as a screw portion at the projecting portion of the cover terminal, a terminal fastener having a male screw or a screw hole is screwed into the screw terminal via a crimp terminal. You can wear it.

Further, a locking portion for locking a tool is formed at a protruding portion of the cover main body to the outside.

According to the means of the present invention, it is possible to prevent a forcible torque from being applied to the cover terminal by locking the tool to the locking portion and screwing the terminal fixing tool. It is possible to prevent the hermetic glass or the like for attaching the cover to the cover body from being damaged.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing the vicinity of a mounting portion of a cover terminal in a thermal battery, and FIG. 2 is a perspective view of the cover terminal and bolts. It is. Components having the same functions as those of the conventional example shown in FIGS. 3 to 5 are denoted by the same reference numerals.

In this embodiment, a cover terminal 2 attached to a cover body 1 similar to the conventional example shown in FIG. 3 will be described. As shown in FIG. 2, the cover terminal 2 has a thick hexagonal prism-shaped nut portion 2a formed on the top of a pin-shaped conductive metal bar, and a screw hole 2b (screw hole) formed in the nut portion 2a from the upper end surface. Part). The screw holes 2b are provided with bolts 3 (terminal stoppers) to be screwed here. Also, this cover terminal 2
Press the lower part and press it flat as before.
c is formed.

Each of the cover terminals 2 is inserted into a through hole 1a formed in the cover body 1 as shown in FIG. And is insulated and attached to the cover body 1 made of stainless steel. Two or more of these cover terminals 2 are connected to the positive electrode and the negative electrode of the power generation unit 5 by spot welding the tip of the internal lead 6 drawn out from the power generation unit 5 to the crushing surface 2c. . When the discharge current of the thermal battery is large, a plurality of cover terminals 2 may be connected to the positive electrode and the negative electrode, respectively, and the current extraction terminal may be divided. Further, some cover terminals 2 may be connected to the middle positive electrode or negative electrode of the power generation unit 5 in some cases. The pair of cover terminals 2 are connected to an internal lead (not shown) for igniting an ignition ball of the power generation unit 5.

As shown in FIG.
The tip of the lead wire 7 from the external circuit is crimped to the crimp terminal 8, and the bolt 3 is screwed into the screw hole 2 b of the nut portion 2 a of the cover terminal 2 via the crimp terminal 8, so that the cover terminal 2 is externally connected. Connect to circuit. However, if the bolt 3 is tightened and screwed with a tool as it is, torque may be applied to the cover terminal 2 and the sealing between the cover terminal 2 and the hermetic glass 4 may be broken. Therefore, when screwing the bolt 3, a wrench is locked to the nut portion 2 a of the cover terminal 2 to prevent rotation. The cover terminal 2 to which the lead wire 7 is connected and fixed in this way is resin-molded with silicon rubber or the like for insulation protection.

As described above, according to the present embodiment, the lead wire 7 from the external circuit can be screwed to the cover terminal 2 with the bolt 3 via the crimp terminal 8, so that the lead wire 7 is soldered. As in the case where the heat battery is connected and fixed to the cover terminal 2, there is no possibility that the solder melts due to the heat generated by the thermal battery to cause a short circuit.

In the present embodiment, the nut 2a is formed on the cover terminal 2 and the rotation is stopped by locking a wrench on the nut 2a. However, the tool is locked on the cover terminal 2. The locking portion is not limited to the hexagonal column-shaped nut portion 2a, but may be, for example, a surface formed by cutting a cylindrical side surface in parallel from both sides. If the insulating sealing portion between the cover main body 1 and the cover terminal 2 has sufficient mechanical strength against the torque of the cover terminal 2, it is not always necessary to provide such a locking portion.

Further, in this embodiment, the cover terminal 2 is formed with the screw hole 2b and the bolt 3 is screwed therein. However, the cover terminal 2 is formed with a male screw portion and the screw hole is formed therein (the nut). ) May be screwed.

[0022]

As is clear from the above description, according to the cover terminal of the thermal battery of the present invention, the lead crimped to the crimp terminal is screwed into the terminal fixing member via the crimp terminal. Since the wires can be connected and fixed, there is no danger that the solder will melt out and cause a short circuit even if the thermal battery becomes hot due to heat generation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention and showing a vicinity of a mounting portion of a cover terminal in a thermal battery.

FIG. 2, showing an embodiment of the present invention, is a perspective view of a cover terminal and a bolt.

FIG. 3 is a longitudinal sectional view showing a conventional example and showing the vicinity of a mounting portion of a cover terminal in a thermal battery.

FIG. 4 is a perspective view of a cover terminal, showing a conventional example.

FIG. 5 is a partially enlarged longitudinal sectional view showing a conventional example and showing a state in which a cover terminal is electrically connected to a cover body by melting solder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover main body 2 Cover terminal 2a Nut part 2b Screw hole 3 Bolt 6 Internal lead 8 Crimp terminal

Claims (3)

[Claims] Claims: 1. A heat battery is attached to a cover body,
In a cover terminal for making an electrical connection between an internal lead in a battery and an external circuit, a screw portion is formed on a protruding portion of the cover body, and a screw is screwed to the screw portion via a crimp terminal. A cover terminal for a thermal battery, comprising a fastener. 2. The screw portion is a screw hole or a male screw formed in a protruding portion of the cover main body, and the terminal stopper is screwed into a male screw or a male screw screwed into the screw hole. The cover terminal for a thermal battery according to claim 1, wherein the cover terminal has a screw hole formed. 3. The cover terminal of a thermal battery according to claim 1, wherein a locking portion for locking a tool is formed at a protruding portion of the cover main body to the outside.