JP2004079280A - Manufacturing method for complex lid for thermal battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a complex lid for a thermal battery capable of having an excellent insulating performance. <P>SOLUTION: The manufacturing method for the complex lid for the thermal battery comprises processes of: (1) applying to the surface of a battery lid 3 equipped with the end of an ignition terminal 5, an electric bridge lead 2 connected with the ignition terminal, and a piezoelectric ignition plug 1 connected with the electric bridge lead, a high viscosity insulating agent 8 at the outside part where the ignition terminal, the electric bridge lead, and the piezoelectric ignition plug are located; (2) applying a low viscosity insulating agent 7 to the inside of the high viscosity insulating agent at the surface so as to cover the ignition terminal, the electric bridge lead, and the piezoelectric ignition plug before the high viscosity insulating agent solidifies; and (3) overlapping an insulating material 6 on the battery lid and adhere before the low viscosity insulating and the high viscosity insulating agents solidify. <P>COPYRIGHT: (C)2004,JPO

Description

【００２１】
比較例では着火しない熱電池が見られたが、実施例では全ての電池で着火することが確認された。このように、本発明の熱電池用複合蓋を用いた熱電池では、圧電点火栓が確実に着火することが示された。
【００２２】
【発明の効果】
以上のように、本発明によれば、優れた絶縁性を有する熱電池用複合蓋が得られる熱電池用複合蓋の製造方法を提供することができる。
【図面の簡単な説明】
【図１】本発明の粘度の異なる２種類の絶縁剤を電池蓋に塗布した熱電池用複合蓋の概略縦断面図である。
【図２】本発明の断熱体を接着した熱電池用複合蓋の概略縦断面図である。
【図３】従来の高粘度絶縁剤を点火端子および電橋リード線全体に塗布した熱電池用複合蓋の概略縦断面図である。
【図４】従来の高粘度絶縁剤を電池蓋の表面全体に塗布した熱電池用複合蓋の概略縦断面図である。
【図５】従来の高粘度絶縁剤を電池蓋の表面全体ならびに点火端子および電橋リード線全体に塗布した熱電池用複合蓋の概略縦断面図である。
【符号の説明】
１　　圧電点火栓
１ａ　点火剤
１ｂ　保持体
２　　電橋リード線
３　　電池蓋
４　　ハーメチックガラス
５　　点火端子
６　　断熱体
７　　低粘度絶縁剤
８　　高粘度絶縁剤[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a composite lid for a thermal battery, and more particularly to a method for insulating a composite lid for a thermal battery.
[0002]
[Prior art]
Conventionally, the insulating treatment of the battery lid surface in the composite lid for thermal batteries has been performed by any of the following methods (1) to (3) using a high-viscosity insulating agent.
(1) As shown in FIG. 3, a high-viscosity insulating agent 18 is applied so as to completely cover only the ignition terminal 15 provided on the battery lid 13 and the electric bridge lead wire 12 connected to the ignition terminal 15.
(2) As shown in FIG. 4, the high-viscosity insulating agent 18 is applied only to the entire surface of the battery cover 13.
(3) As shown in FIG. 5, after applying the high-viscosity insulating material 18 over the entire surface of the battery lid 13, the high-viscosity insulating material 18 is further applied so as to completely cover the electric bridge lead wire 12 and the ignition terminal 15. .
After the insulating treatment is performed by any one of the methods (1) to (3) and the high-viscosity insulating material 18 is solidified, the high-viscosity insulating material 18 is applied again for storing and protecting the piezoelectric ignition plug 11. Then, a heat insulator (not shown) having an opening for accommodating the piezoelectric ignition plug 11 is adhered to the battery lid 13.
[0003]
[Problems to be solved by the invention]
In order to activate a thermal battery provided with a piezoelectric ignition plug, it is an absolute condition that spark discharge is caused between ignition terminals to which a voltage higher than that of the piezoelectric element is applied, thereby igniting the piezoelectric ignition plug. However, since the voltage is very high, creeping discharge is likely to occur except between the ignition terminals. Therefore, a phenomenon that the thermal battery is not activated without being discharged between the ignition terminals is likely to occur.
Here, in the above-mentioned conventional insulating treatment, a high-viscosity insulating agent is used in order to improve workability. However, spaces due to bubbles are easily generated inside the insulating agent, and the degree of application of the insulating agent is likely to be uneven. For this reason, the insulating property becomes non-uniform, and there is a possibility that insulation failure occurs in a portion where the amount of the insulating agent is small. Therefore, it is considered that the conventional insulation treatment may not be able to prevent creeping discharge except between the ignition terminals as described above.
[0004]
As a means for eliminating such non-uniformity of insulation, use of a low-viscosity insulating agent instead of a high-viscosity insulating agent is conceivable, but even if the low-viscosity insulating agent is sufficiently applied to a predetermined application location. In addition, since the insulating agent has a low viscosity, there is a problem that the insulating agent flows out to a portion that should not be applied, so that the workability is remarkably reduced or a defect is apt to occur.
Other insulation treatment methods have been proposed in JP-A-7-282820 and JP-A-9-45342, but they cannot completely prevent creeping discharge except between ignition terminals.
[0005]
In view of the above, an object of the present invention is to provide a method for manufacturing a composite lid for a thermal battery capable of obtaining a composite lid for a thermal battery having excellent insulating properties in order to solve the above-described conventional problems.
[0006]
[Means for Solving the Problems]
The method for manufacturing a composite lid for a thermal battery according to the present invention includes: (1) an end of an ignition terminal, an electric bridge lead wire connected to the ignition terminal, and a piezoelectric ignition plug connected to the electric bridge lead wire. A step of applying a high-viscosity insulating material to the surface of the battery lid provided, outside the portion where the ignition terminal, the electric bridge lead wire and the piezoelectric ignition plug are located, (2) before the high-viscosity insulating material solidifies, Applying a low-viscosity insulator to the inside of the high-viscosity insulator on the surface so as to cover the ignition terminal, the electric bridge lead wire and the piezoelectric ignition plug; and (3) applying the low-viscosity insulator and the high viscosity Before the insulating agent is solidified, the method includes a step of laminating a heat insulator on the battery lid and bonding the same.
It is preferable that the viscosity of the high-viscosity insulating agent is 4.5 to 100 Pa · s (at 23 ° C.).
It is preferable that the viscosity of the low-viscosity insulating agent is 0.6 to 5 Pa · s (at 23 ° C.).
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
The method for producing a composite lid for a thermal battery according to the present invention includes the following three steps.
[0008]
(1) On the surface of the battery lid 3 including the end of the ignition terminal 5, the electric bridge lead 2 connected to the ignition terminal 5, and the piezoelectric ignition plug 1 connected to the electric bridge lead 2. A high-viscosity insulating material 8 is applied to the outside of the portion where the ignition terminal 5, the electric bridge lead wire 2 and the piezoelectric ignition plug 1 are located.
(2) Before the high-viscosity insulating material 8 is solidified, a low-viscosity material is provided on the surface of the battery lid 3 so as to cover the ignition terminal 5, the electric bridge lead wire 2 and the piezoelectric ignition plug 1 inside the high-viscosity insulating material 8. An insulating agent 7 is applied.
(3) Before the low-viscosity insulating material 7 and the high-viscosity insulating material 8 solidify, the heat insulator 6 is overlaid on the battery lid 3 and then adhered.
[0009]
As shown in FIG. 1, when applying the low-viscosity insulating agent 7 to the surface of the battery lid 3 in the step (2), the periphery of the applied portion is covered with the high-viscosity insulating agent 8 applied in the previous step (1). Coated. For this reason, it is possible to prevent the low-viscosity insulating agent 7 from flowing out to the unapplicable portion, and it is possible to suppress the occurrence of defects and a decrease in workability.
[0010]
Conventionally, the insulation treatment was performed using only one kind of high-viscosity insulating agent. In contrast, in the present invention, the low-viscosity insulating agent 7 and the high-viscosity insulating agent having different viscosities in step (1) and step (2). As shown in FIG. 1, the peripheral portion of the piezoelectric ignition plug 1 that may cause creeping discharge is covered with a low-viscosity insulating material 7 using two types of insulating materials 8. For this reason, in the portion where the low-viscosity insulating material 7 is applied, there is no variation in the insulating properties due to the generation of bubbles inside the insulating material and the nonuniformity of the application degree as seen in the conventionally used high-viscosity insulating material 8. And excellent insulation properties can be obtained.
[0011]
In the step (3), as shown in FIG. 2, the heat insulator 6 is bonded to the battery lid 3 by the high-viscosity insulating agent 8 applied in the step (1) and the low-viscosity insulating agent 7 applied in the step (2). are doing. Therefore, the workability is improved because it is not necessary to re-apply the insulating agent to the battery lid, which has been performed at the time of bonding the conventional heat insulator.
[0012]
The viscosity of the high-viscosity insulating agent 8 is preferably 4.5 to 100 Pa · s (at 23 ° C.) because the high-viscosity insulating agent and the low-viscosity insulating agent do not mix at the contact interface. Examples of the high-viscosity insulating agent 8 include resins such as silicone resin and epoxy resin.
[0013]
The viscosity of the low-viscosity insulating agent 7 is 0.6 to 5 Pa · s (at 23 ° C.) because of its good fluidity, thereby suppressing the generation of bubbles inside the insulating agent and enabling the coating degree to be uniform. Is preferred. Examples of the low-viscosity insulating agent 7 include a resin such as a silicone resin.
[0014]
【Example】
Embodiments of the present invention will be described below.
[0015]
"Example"
The composite lid for a thermal battery shown in FIG. 2 was produced as follows.
A battery lid 3 was used in which a sheet made of polytetrafluoroethylene having an insulating property was attached to the entire surface thereof, and a through hole through which the ignition terminal 5 penetrated was filled with hermetic glass 4. A holder 1b made of a glass material was used to hold the ends of the electric bridge lead wires 2 facing each other. In addition, the end of the electric bridge lead wire 2 was covered with an igniter 1a made of zirconium and barium chromate. Then, the electric bridge lead wire 2 having a piezoelectric ignition plug 1 composed of the ignition agent 1a and the holder 1b at an end thereof is connected to an ignition terminal 5 fixed to the battery cover 3, and an ignition as shown in FIG. A battery lid 3 including the terminal 5, the electric bridge lead wire 2, and the piezoelectric ignition plug 1 was produced.
[0016]
As shown in FIG. 1, a high-viscosity insulating agent 8 having a viscosity of 4.5 Pa · s (at 23 ° C.) and a dielectric breakdown strength of 20 kV / mm is provided on the surface of the battery lid 3 outside the ignition terminal 5. A high-viscosity silicone resin having the following was applied. Immediately after the application of the resin, a viscosity of 2 Pa · s (at 23 ° C.) and a dielectric breakdown strength of 20 kV / mm are applied as a low-viscosity insulating agent 7 on the surface of the battery lid 3 inside the applied high-viscosity resin. Was applied so as to completely cover the ignition terminal 5 and the electric bridge lead wire 2. Next, as shown in FIG. 2, before the high-viscosity and low-viscosity silicone resins were solidified, the heat insulator 6 was immediately stacked on the battery lid 3 and then adhered to produce a composite lid for a thermal battery.
[0017]
Using the composite lid for a thermal battery obtained above, a thermal battery was produced by the following method.
A unit cell and a heating agent were alternately stacked to form a stack. The unit cell used was composed of a negative electrode made of lithium or a lithium alloy, a positive electrode containing iron disulfide, and an electrolyte obtained by impregnating a ceramic with a molten salt. As the heat generating agent, a mixture formed of iron powder as a reducing agent and potassium perchlorate powder as an oxidizing agent was used. The stack was provided with a flaming agent at the top and outer periphery, and was further surrounded by a heat insulating material and then housed in a battery case. Then, the opening of the battery case was sealed with a composite lid for a thermal battery provided with the piezoelectric ignition plug obtained above. 64 thermal batteries were produced.
In this thermal battery, when a high voltage is applied between the ignition terminals of the thermal battery, the piezoelectric spark plug burns. This heat of combustion propagates to the exothermic agent via a pyrotechnic agent provided around the stack. The unit cell temperature rises due to the heat generated by the heating agent, and the heat cell is activated.
[0018]
<< Comparative Example >>
In the same manner as in the example, a battery lid 13 having an ignition terminal 15, a bridge lead wire 12, and a piezoelectric ignition plug 11 as shown in FIG.
Then, as shown in FIG. 5, after applying a high-viscosity silicone resin as a high-viscosity insulating agent 18 to the entire surface of the battery cover 13, the high-viscosity silicone resin is further applied to the entire surface of the electric bridge lead wire 12 and the ignition terminal 15. Was applied. The silicone resin used had a viscosity of 4.5 Pa · s (at 23 ° C.) and a dielectric breakdown strength of 20 kV / mm. Next, after the silicone resin is solidified, the same silicone resin is applied again to the already applied portion, and the same heat insulator (not shown) as in the embodiment is adhered to the battery cover 13 to provide a heat battery. A composite lid was made. Except using this composite lid for thermal batteries, 64 thermal batteries were produced in the same manner as in the example.
[0019]
[Evaluation]
A piezoelectric ignition device was connected to the ignition terminal of the thermal battery prepared above, and energy of 10 kV / 2 mJ was supplied. Then, it was confirmed whether the piezoelectric ignition plug ignited. Table 1 shows the evaluation results.
[0020]
[Table 1]

[0021]
In the comparative example, a non-ignited thermal battery was found, but in the example, ignition was confirmed in all batteries. As described above, in the thermal battery using the composite lid for a thermal battery of the present invention, it was shown that the piezoelectric ignition plug ignited reliably.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a method of manufacturing a composite lid for a thermal battery, which can provide a composite lid for a thermal battery having excellent insulating properties.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a composite lid for a thermal battery in which two kinds of insulating agents having different viscosities of the present invention are applied to a battery lid.
FIG. 2 is a schematic longitudinal sectional view of a composite lid for a thermal battery to which a heat insulator of the present invention is bonded.
FIG. 3 is a schematic vertical sectional view of a conventional composite lid for a thermal battery in which a high-viscosity insulating agent is applied to the entirety of an ignition terminal and a lead wire of an electric bridge.
FIG. 4 is a schematic vertical sectional view of a conventional composite lid for a thermal battery in which a high-viscosity insulating agent is applied to the entire surface of the battery lid.
FIG. 5 is a schematic longitudinal sectional view of a composite lid for a thermal battery in which a conventional high-viscosity insulating agent is applied to the entire surface of the battery lid, the entire ignition terminal and the lead wire of the bridge.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 piezoelectric ignition plug 1 a ignition agent 1 b holder 2 battery bridge lead 3 battery lid 4 hermetic glass 5 ignition terminal 6 heat insulator 7 low-viscosity insulator 8 high-viscosity insulator

Claims (3)

(1) On the surface of a battery lid including an end of an ignition terminal, an electric bridge lead wire connected to the ignition terminal, and a piezoelectric ignition plug connected to the electric bridge lead, A step of applying a high-viscosity insulating agent outside the portion where the bridge lead wire and the piezoelectric ignition plug are located,
(2) A step of applying a low-viscosity insulating material to the inside of the high-viscosity insulating material on the surface so as to cover the ignition terminal, the electric bridge lead wire, and the piezoelectric ignition plug before the high-viscosity insulating material solidifies. And (3) a method for manufacturing a composite lid for a thermal battery, comprising a step of laminating and attaching a heat insulator to the battery lid before the low-viscosity insulating agent and the high-viscosity insulating agent solidify. The method for producing a composite lid for a thermal battery according to claim 1, wherein the viscosity of the high-viscosity insulating agent is 4.5 to 100 Pa · s (at 23 ° C). The method for producing a composite lid for a thermal battery according to claim 1, wherein the viscosity of the low-viscosity insulating agent is 0.6 to 5 Pa · s (at 23 ° C.).

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