JPH043394Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention improves the safety of electrolyte batteries that are installed and used as power sources for electronic devices and the like.

[Conventional technology]

Conventionally, as shown in FIG. 4, this type of battery has been constructed by fitting a sealing body 2 also made of stainless steel to the upper end opening of an electrode can 1 made of stainless steel, and opening 2a formed in the center of the sealing body 2. It is known that a pin-shaped stainless steel electrode terminal 3 is sealed via an annular insulator 4 having a U-shaped cross section. In this battery, a positive electrode and a negative electrode (both not shown) are insulated and arranged in an electrode can 1 in advance, an electrolyte is injected, and an insulator 4 is fitted into a sealing body 2.
The electrode terminal 3 is passed through the insulator 4, and the washer 5 which is brought into contact with the inner end surface of the can of the insulator is fixed by caulking with the inner end 3a of the electrode terminal 3.
is assembled by welding the cap to the electrode can 1.

As another example, as shown in FIG. 5, there is a hermetic type in which an alumina insulator 4' is heat-bonded between a titanium sealing body 2 and a titanium electrode terminal 3, and a sixth type. As shown in the figure, a structure in which an electrode terminal 3 made of Kovar is sealed to a sealing body 2 made of stainless steel using a glass frit 6 is known.

[Problem that the invention attempts to solve]

These electrolyte batteries are used as power sources for various electronic devices.Recently, electronic devices are rapidly becoming less power consuming and have longer lifespans, and these types of batteries also require stable performance over a long period of time. However, in the battery of the conventional structure described above, there was a risk that the entire battery would explode when the internal pressure of the electrode can 1 increased.

In view of the above-mentioned circumstances, the present invention aims to prevent the entire battery from bursting when the internal pressure of the electrode can increases, thereby increasing safety.

[Means for Solving the Problems] In order to solve the above problems, the electrolyte battery of the present invention has a shaft of an electrode terminal on the inner periphery of a cylindrical bent part bent at the opening of the sealing body of the electrode can. An O-ring-shaped insulator made of resin or rubber and having appropriate elasticity is provided between the inner circumferential surface of the bent portion and the outer circumferential surface of the shaft portion of the electrode terminal. The body is slidably press-fitted, and the inner circumferential surface of the bent portion is formed into a curved surface having the largest diameter at its axial center.

[Effect]

In the above configuration, the pressure within the electrode can that acts on the inner end of the shaft of the electrode terminal and the O-ring-shaped insulator on the outer periphery of the shaft causes the O-ring-shaped insulator to move around the inner periphery of the cylindrical bent part of the opening of the sealing body. is pressed toward the outside of the can, and at this time, since the inner circumferential surface of the bent portion forms a curved surface with the largest diameter at the center in the axial direction, the insulator is pressed toward the outside of the can. As it is compressed in the radial direction, it exhibits good leakage resistance.
Also, as the pressure inside the electrode can further increases,
Since there is a limit to the increase in the adhesion force between the electrode terminal and the shaft due to the radial compression of the insulator, the shaft of the electrode terminal will eventually come off due to the axial load due to the pressure inside the can, reducing the pressure inside the can to the outside. open to

〔Example〕

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

The electrolyte battery shown in Fig. 1 has a positive electrode and a negative electrode (both not shown) arranged insulated inside, and a titanium electrode can 1 filled with electrolyte is sealed with a titanium sealing body 2. The sealing body 2 is fitted with an opening 2a in the center thereof. A cylindrical bent portion 2b bent toward the inside of the can is formed in the opening 2a, and the inner peripheral surface of the bent portion 2b is a curved surface with the largest diameter at its axial center. .

On the inner periphery of the opening 2a, that is, the bent portion 2b,
A shaft portion 3a of a pin-shaped electrode terminal 3 is loosely fitted so as to be movable in the axial direction, and its inner end 3b protrudes into the can, and the outer peripheral surface of the shaft portion 3a and the curved inner surface of the bent portion 2b are connected to each other. An O-ring-shaped insulator 4 made of rubber is press-fitted between the peripheral surfaces.

In the electrolyte battery having the above configuration, as shown in FIG. As a result, the O-ring-shaped insulator 4 is moved toward the outside of the can from its original position indicated by the broken line in the figure, but the inner circumferential surface of the cylindrical bent portion 2b that slides into contact with the outer circumference of the insulator 4 Since has a curved surface, the insulator 4 is compressed in the radial direction between the outer circumferential surface of the shaft portion 3a and the inner circumferential surface of the bent portion 2b as the insulator 4 moves, improving the adhesion between them. Demonstrates excellent leakage resistance. Further, as the pressure P further increases, the amount of compression of the insulator 4 due to the movement of the inner circumferential surface of the curved bent portion 2b toward the outside of the can and the resulting adhesion force with the shaft portion 3a reach a limit. Therefore, due to the axial load caused by the pressure P, the electrode terminal 3, alone or together with the O-ring insulator 4, comes out of the opening 2a, releasing the pressure P inside the electrode can 1 to the outside.

FIG. 3 shows a second embodiment of the present invention in which the sealing body 2 is made of stainless steel, and an additional space is added to the structure of the first embodiment described above in the space surrounded by the sealing body 2 and the head 3c of the electrode terminal 3. By adding a structure in which one O-ring-shaped insulator 7 is interposed, the same effect as described above can be obtained, and the leakage resistance and stability of the electrode terminal 3 can be improved.

[Effect of idea]

As described above, according to the present invention, the O-ring-shaped insulator is
The electrolyte in the electrode can is compressed in the radial direction between the outer peripheral surface of the shaft of the electrode terminal and the curved inner peripheral surface of the bent part of the opening of the sealing body due to the pressure inside the can, increasing the contact force. Moreover, if the pressure inside the electrode case rises abnormally, the fixing force of the O-ring-shaped insulator due to the radial compression reaches its limit. Since the shaft portion of the electrode terminal comes out and releases the pressure inside the can, it is possible to prevent the entire battery from bursting and improve safety.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a first embodiment of the electrolyte battery according to the present invention, FIG. , FIG. 4 is a sectional view showing an electrolyte battery as a conventional example, and FIGS. 5 and 6 are partial sectional views showing other conventional examples. 1... Electrode can, 2... Sealing body, 2a... Opening,
2b...Bending portion, 3...Electrode terminal, 3a...Shaft portion, 4...O-ring-shaped insulator.

Claims (1)

[Scope of utility model registration request] The shaft portion of the electrode terminal is loosely fitted into the inner periphery of a cylindrical bent portion bent in the opening of the sealing body of the electrode can so as to be movable in the axial direction, and penetrated into the electrode can. An O-ring-shaped insulator made of a resin or rubber having appropriate elasticity is slidably press-fitted between the outer circumferential surface of the shaft portion of the electrode terminal, and the inner circumferential surface of the bent portion is adjusted such that the center portion in the axial direction is the most An electrolyte battery characterized by being formed into a curved surface with a large diameter.