JP4563063B2 - Thermal battery - Google Patents

Description

  The present invention relates to a structure of a thermal battery.

In recent years, with the improvement in performance of devices using thermal batteries, it has been required to shorten the voltage rise time and improve the startability of the thermal batteries.
In response to this requirement, for example, Patent Document 1 discloses a thermal battery in which a heat conduction hole is provided in the central portion of a power generating body including a unit cell, a heat generating agent, and an ignition plate, and a spark plug emits a flame toward the heat conduction hole. Proposed.

An example of a conventional thermal battery will be described with reference to FIG.
The battery container 38 includes a battery case 39 and a battery lid 40, which are joined together by welding to form a sealed container. The battery container 38 accommodates a power generator 31 whose side is covered with a igniter zone 33, and a heat insulator 37 and a lid heat insulator 41 that surround the power generator 31.
The battery cover 40 is provided with a pair of output terminals 35a and 35b and a pair of ignition terminals 36a and 36b. The output terminal 35a is electrically connected to the positive electrode layer in the lowermost unit cell of the power generator 31 by a lead plate 34a. The output terminal 35b is electrically connected to the negative electrode layer in the uppermost unit cell of the power generator 31 by a lead plate 34b. The pair of ignition terminals 36a and 36b is electrically connected to the spark plug 21 via a lead wire 22 described later.

An ignition plug 21 is provided in the upper part of the power generation body 31, and a heat conduction hole 32 penetrating the power generation body 31 is formed in the center of the power generation body 31. As shown in FIG. 6, the power generator 31 is formed by stacking a plurality of unit cells 42, a heat generating agent 43, and an ignition plate 44. FIG. 6 is a partially enlarged view of the power generator 31 in FIG.
As shown in FIG. 7, the ignition plate 44 in FIG. 6 includes a strip-shaped ignition agent 45, a member composed of a semicircular metal piece 47 disposed on both sides of the ignition agent 45, and two sheets sandwiching this member And a metal plate 46. The igniting agent 45 and the metal plate 46 have a hole 45a and a hole 46a that constitute a heat conduction hole. The igniting agent 45 is exposed to the heat conducting hole at the portion of the hole 45a, and contacts the igniting zone 33 at the outer peripheral end.

  As shown in FIG. 8, the power generator is configured by arranging a plurality of laminated body blocks 48 in which unit cells 42 and heat generating agents 43 are alternately deposited between a plurality of ignition plates 44. . And since the electrical connection part which consists of the metal plate 46 and the metal piece 47 which comprise the ignition board 44 will be in the electrical continuity state between the laminated body blocks 48, all the laminated | stacked unit cells 42 are connected in series. .

Next, activation of the above-described conventional thermal battery will be described with reference to FIGS. FIG. 8 is a diagram showing the positional relationship and structure of the spark plug 21, the heat conduction hole 32, and the power generator 31 in FIG.
The power generator 31 shown in FIG. 5 has a structure in which four laminate blocks 48 are provided as shown in FIG. Combustion propagates in the direction of the arrow shown in FIG.

First, the ignition terminals 36a and 36b are energized from an external power source. As a result, a flame is emitted from the spark plug 21 toward the heat introduction hole 32, and the ignition agent 45 in each ignition plate 44 is burned. Combustion of the igniting agent 45 diffuses radially in the outer peripheral direction, and the ignition zone 33 is combusted by the combustion of the igniting agent 45 reaching the outer peripheral end. Furthermore, the unit cell 42 is heated by the combustion of the heat generating agent 43, and a maximum voltage is generated when all the stacked unit cells 42 are heated.
In this case, the distance of the installation interval of the ignition plate 44 corresponds to the distance at which the igniter zone 33 burns. If the igniter plates 44 are evenly installed between the laminate blocks 48 so that the burning distance of the igniting zone 33 becomes uniform, combustion is propagated through a route as shown in FIG. To do.

Here, the schematic longitudinal cross-sectional view of the conventional spark plug 21 in FIGS. 5-8 is shown in FIG.
The spark plug 21 includes a holding body 23 that holds a pair of lead wires 22, an electric bridge wire 24 that connects the ends of the pair of lead wires 22, and an ignition agent 25 a that covers the ends of the lead wires 22 and the electric bridge wire 24. And a resin portion 25 covering the surface of the ignition agent 25a. The spark plug 21 is installed inside the battery lid 40 by a lead wire 22 and a heat insulator 37 that covers the lead wire 22.

  However, since the entire bottom of the spark plug 21 is exposed to the fire guide hole 32, the spark plug 21 is easily displaced by an impact such as vibration, and it is difficult to keep the direction of the flame emitted from the spark plug 21 constant. There is a possibility that the flame will not reach. Further, even when a flame reaches the entire heat conduction hole 32, if the degree of arrival is not uniform, there is a possibility that a portion where ignition to the ignition plate 44 is insufficient is generated. In such a case, there is a problem that the rise time of the voltage is delayed.

Further, when the spark plug is press-fitted into the battery lid and fitted, it is difficult to fix the spark plug at a predetermined position without slipping because the spark plug is exposed.
Furthermore, in order to make the ignition plate easier to ignite, if the amount of igniting agent is increased and the momentum of the flame is increased too much, the lithium generated in the negative electrode leaks due to the generated heat, causing an internal short circuit in the power generator at the beginning of discharge. There is a case.
Japanese Patent Laid-Open No. 5-157881

  Therefore, in order to solve the above-mentioned problem, the present invention fixes a spark plug so as not to be displaced so that the flame reaches the entire heat conduction hole of the power generator uniformly, and a thermal battery that starts surely and quickly is provided. The purpose is to provide.

  The first thermal battery of the present invention includes a power generator having a heat conduction hole in the center, a spark plug complex including a spark plug and a frame body that stores the spark plug, and the spark plug complex fixedly received. And a lid heat insulator having a hole communicating from the groove to the heat conduction hole, and the frame body emits a flame on the bottom surface from the ignition plug toward the heat conduction hole. Having an opening, wherein the opening, the hole, and the heat conduction hole are coaxially arranged, and a ratio of the diameter of the heat conduction hole to the diameter of the opening is 0.6 to 9.0. It is characterized by.

  The second thermal battery of the present invention includes a power generating body having a heat conduction hole in the center, a spark plug complex including a spark plug and a frame body that stores the spark plug, and the spark plug complex fixedly received. And a lid heat insulator having a hole communicating from the groove to the heat conduction hole, and the frame body emits a flame on the bottom surface from the ignition plug toward the heat conduction hole. And having an opening, wherein the opening, the hole, and the heat conduction hole are coaxially arranged, and a ratio of the diameter of the hole to the diameter of the opening is 0.6 to 9.0. And

  The third thermal battery of the present invention covers a power generation body having a heat conduction hole in the center, a holding body for holding a pair of lead wires, a bridge wire connecting the pair of lead wires, and the bridge wire. An ignition plug made of ignition powder, an ignition powder arranged in front of the ignition plug, a cylindrical member for holding the ignition plug and the ignition powder, a frame body for housing the cylindrical member, and an opening of the frame body; A lid having an ignition plug complex including a plate-like member disposed between the ignition powder, a groove portion for fixing and accommodating the ignition plug complex, and a hole communicating from the groove portion to the fire conduction hole The frame body has an opening for emitting a flame from the spark plug toward the fire hole on the bottom surface, the opening, the hole, and the fire hole Are arranged on the same axis, and the ratio of the diameter of the ignition powder and the ignition powder to the diameter of the opening is 1.1. Characterized in that it is a 25.0.

It is preferable that the opening has a plurality of openings.
It is preferable that the frame body has a concave portion or a convex portion on a bottom surface portion thereof, and the lid heat insulator has a convex portion or a concave portion fitted to the concave portion or the convex portion on the bottom surface portion of the groove portion.

  According to the present invention, since the spark plug is fixed, a flame can be emitted uniformly to the heat conduction hole of the power generator, and the heat generating agent and the igniting agent can be directly combusted, so that it can be performed quickly and reliably. A thermal battery can be provided.

An example of the thermal battery of the present invention will be described with reference to FIGS. FIG. 1 is a schematic longitudinal sectional view of a thermal battery of the present invention.
The present invention includes a power generator 1 having a heat conduction hole 2 in the center, a spark plug complex 11 including a spark plug and a frame body 19 that accommodates the spark plug, and a groove portion 6a that fixes and accommodates the spark plug complex 11. And a lid heat insulator 6 having a hole 6b communicating from the groove 6a to the heat conduction hole 2, and an opening for the frame body 19 to emit a flame from the spark plug toward the heat conduction hole 2 on the bottom surface portion. The thermal battery includes an opening 20, a hole 6 b, and a heat conduction hole 2 coaxially arranged.
The battery container 8 is composed of a battery case 9 and a battery lid 10, both of which are joined by welding to constitute a sealed container. The battery case 8 includes a power generation body 1 whose side surface is covered with the igniting zone 3, a lid heat insulator 6 disposed on the top of the power generation body 1, and a heat insulator 7 disposed on the side surface and the bottom. Is housed.

The battery lid 10 provided with the pair of output terminals 5a and 5b has a hole (through hole) 10a for accommodating a spark plug complex 11 to be described later in the battery case. The output terminal 5a is electrically connected to the positive electrode layer of the unit cell at the bottom of the power generator 1 by the lead plate 4a. The output terminal 5b is electrically connected to the negative electrode layer of the unit cell at the top of the power generator 1 by the lead plate 4b.
The power generator 1 has the same configuration as the power generator 31 of FIG. 8 described above, has a heat conduction hole 2 in the center, is arranged between a plurality of ignition plates, and the ignition plate, and a unit cell, a heating agent, It consists of the laminated body block which laminated | stacked alternately. The ignition plate has the same configuration as the ignition plate 44 shown in FIG. A spark plug complex 11 is installed on the top of the power generator 1.

Here, FIG. 2 is an enlarged cross-sectional view of a portion X (near the place where the spark plug complex is installed) of FIG. FIG. 3 is an exploded longitudinal sectional view of the ignition plug composite.
The spark plug composite 11 is accommodated in the groove 6 a of the lid heat insulator 6. The lid heat insulator 6 has a hole 6 b that communicates from the groove 6 a to the fire guide hole 2. The groove 6a and the hole 6b are each composed of a hole having a large diameter and a hole having a small diameter, and the spark plug composite 11 is fixed by a portion (step) corresponding to the difference between the diameters.
Thus, since the spark plug is securely fixed, the direction of the flame emitted from the spark plug can be kept constant without being displaced by an impact such as vibration.

The ignition plug includes a holding body 13 that holds a pair of lead wires 12, an electric bridge wire 14 that connects the pair of lead wires 12, and an ignition agent 15 a that covers the electric bridge wire 14.
The spark plug complex 11 includes the spark plug, an ignition powder 15b disposed below the ignition plug, a cylindrical member 16 that holds the ignition plug and the ignition powder 15b, and a frame body 19 that houses the cylindrical member 16. Consists of. The cylindrical member 16 includes a housing portion 16a that houses the holding body, and a housing portion 16b that houses a portion (hereinafter, referred to as a gunpowder portion 17) composed of the ignition powder 15a and the ignition powder 15b. The parts 16b are adjacent to each other. Here, since not only the igniter 15a but also the igniter 15b is used, the flame at the time of ignition becomes a particulate lump, and the ignitability to the power generator is improved.

  The frame 19 has an opening 20 for the spark plug to emit a flame on the bottom surface. And the opening part 20, the hole 6b, and the fire conduction hole 2 are located on coaxial. Further, a metal plate member 18 is disposed between the explosive portion 17 and the opening 20 so as to close the opening 20. Aluminum or the like is used for the plate-like member 18. Since the inside of the spark plug is sealed by the plate member 18, the internal pressure of the spark plug is increased by combustion, and the power of the flame is increased. When the internal pressure rises to some extent, the plate-like member 18 is melted and penetrates, and the flame jumps out toward the fire guide hole 2.

The opening 20 may have a plurality of openings. For example, the heat conduction holes and the holes may be arranged on the same axis, and a plurality of openings in the opening may be arranged at equal intervals on a concentric circle centering on the intersection of the bottom surface of the frame and the shaft.
The flame emitted from the spark plug reaches the heat guide hole 2 through the hole 6 b from the opening 20 in the spark plug composite 11. Thereby, the spark plug can emit a flame uniformly to the entire heat conduction hole 2 of the power generator 1.

  When the ratio D / B of the diameter D of the heat conduction hole 2 to the diameter B of the opening 20 is 0.6 to 9.0, the thermal battery can be reliably and quickly started. If it is less than 0.6, the heat conduction hole of the power generator becomes too small, and the flame emitted from the spark plug hardly reaches the entire heat conduction hole. On the other hand, if it exceeds 9.0, the heat conduction hole becomes too large, the reaction area of the unit cell becomes small, the current flowing per unit area increases, and the internal resistance increases.

  Further, when the ratio C / B of the diameter C of the hole 6b to the diameter B of the opening 20 is 0.6 to 9.0, the thermal battery can be reliably and quickly started. If it is less than 0.6, the diameter of the hole in the lid heat insulator becomes too small, making it difficult for the flame to reach the heat conduction hole. On the other hand, if it exceeds 9.0, the hole of the lid heat insulator becomes too large and the flame tends to spread, so that the power of the flame is reduced and the flame is difficult to reach far.

  In addition, when the ratio A / B of the diameter A of the explosive portion 17 (ignition powder 15a and ignition powder 15b) in the spark plug composite with respect to the diameter B of the opening 20 is 1.1 to 25.0, the thermal battery is surely And can be started quickly. When it is less than 1.1, it becomes difficult to fix the ignition agent and the ignition agent in the ignition plug composite. On the other hand, if it exceeds 25.0, the spark plug complex becomes large, and the amount of the igniting agent and the igniting agent increases, resulting in an increase in cost and a voltage fluctuation due to the amount of heat.

  The frame body 19 has a concave portion or a convex portion in a portion other than the opening portion 20 in the bottom portion, and the lid heat insulator 6 is fitted with the concave portion or the convex portion in a portion other than the hole 6b in the bottom portion of the groove portion 6a. You may have a convex part or a concave part to match. The spark plug composite can be more reliably fixed in the groove portion of the lid heat insulator.

In addition to the above-described FIG. 3, the spark plug complex 11 may be one that is configured using a conventional spark plug 21 as shown in FIG. 4. The ignition plug composite of FIG. 4 accommodates the ignition plug 21, a cylindrical member 26 that accommodates the ignition plug 21, an ignition agent 25b disposed below the ignition agent 25a, and the ignition plug 21 and the ignition agent 25b. The frame 29 includes a plate-like member 28 disposed between the frame 29 and the ignition powder 25b. The frame 29 has an opening 30 that emits a flame from the spark plug 21.
Examples of the present invention will be described in detail below.

<< Examples 1-4 and Comparative Examples 1-2 >>
(I) Production of spark plug composite A spark plug composite 11 having the same structure as that shown in Fig. 3 was prepared as follows.
A pair of leads made of a Ni-Co-Fe-based alloy (weight ratio Ni: Co: Fe = 29: 17: 54) drawn from a ceramic holding body 13 and a bridge wire 14 made of nichrome wire or platinum iridium. The tip of the wire 12 was welded. And the ignition powder 15a was filled so that the bridge line 14 might be covered, and the spark plug main body was obtained. In the ignition agent 15a, boron, potassium perchlorate, barium nitrate, and fluorine rubber (DuPont Dow Elastomer, Viton) as a binder are mixed at a weight ratio of 40: 30: 24: 6. Was used.

  Further, an ignition powder 15b is disposed below the ignition powder 15a. As the ignition powder 15b, a mixture of boron and potassium nitrate at a weight ratio of 25:75 was used. In addition, the diameter of the explosive part 17 which consists of the ignition powder 15a and the ignition powder 15b was 12 mm. Next, the spark plug main body and the ignition agent 15b were accommodated in a cylindrical member 16 made of stainless steel. And after accommodating this cylindrical member 16 in the frame 19 which consists of aluminum, the upper end edge part of the frame 19 is bend | folded inward, the cylindrical member 16 is fixed to the frame 19, and the ignition plug composite 11 Got. At this time, a plate-like member 18 made of aluminum was disposed inside the frame body 19 so as to close the opening 20 of the frame body 19. In addition, the diameter of the opening part 20 of the frame 19 was 8.0 mm.

(Ii) Production of power generation body Four laminate blocks were formed using 135 disc-shaped unit cells having an outer diameter of 50 mm and 139 heating agents. And the ignition board of the structure similar to FIG. 7 mentioned above was installed between each laminated body block. In addition, ignition plates were arranged on the uppermost end and the lowermost end where the four laminated blocks were laminated.
In the unit cell, a negative electrode layer made of metallic lithium, an electrolyte layer made of a lithium chloride-potassium chloride mixed eutectic salt, and a positive electrode layer made of iron disulfide were used. As the exothermic agent, a mixture of potassium perchlorate and iron was used. Moreover, each member which comprises the electric power generation body 1 was each provided with the hole which comprises the heat conduction hole 2, and the diameter of the heat conduction hole 2 was 4.8 mm.

(Iii) Assembly of thermal battery A thermal battery having the same structure as that shown in Fig. 1 was prepared using the spark plug composite obtained above.
A lid heat insulator 6 made of polyphenylene sulfide was bonded to the inside of the battery lid 10 using a silicone resin. Then, the ignition plug composite 11 was press-fitted from the hole 10 a of the battery cover 10 having a pair of output terminals, and the ignition plug composite 11 was accommodated in the groove 6 a of the cover heat insulator 6. The diameter of the hole 6b of the lid heat insulator 6 was 8.0 mm. The lid portion 10b was disposed on the top of the spark plug complex 11, and the hole portion 10a was sealed.

  After covering the periphery of the power generator 1 with the igniter zone 3, this was accommodated in the battery case 9. Zirconium, barium chromate and inorganic fibers were used for the igniter zone 3. The lowermost unit cell in the power generator 1 and the output terminal 5a were connected by a lead plate 4a. Further, the uppermost unit cell and the output terminal 5b were connected by the lead plate 4b. The bottom and side portions of the power generator 1 were filled with a ceramic fiber material mainly composed of silica and alumina as a heat insulator 7. The battery lid 10 integrated with the lid heat insulator 6 and the spark plug complex 11 and the battery case 9 were welded to seal the battery.

  At this time, in the production of the thermal battery, the diameter A of the explosive portion in the spark plug composite, the diameter B of the opening of the frame body in the spark plug composite, the diameter C of the hole in the lid heat insulator, and the fire in the power generator The diameter D of the guide hole was variously changed as shown in Table 1.

<< Comparative Example 3 >>
A conventional thermal battery similar to that shown in FIG.
A conventional spark plug 21 similar to that shown in FIG. 9 was used as the spark plug. The diameter of the ignition agent 25a in the ignition plug 21 was 6.5 mm. The lead wire 22 of the spark plug 21 was connected to the ignition terminals 36 a and 36 b fixed to the battery lid 40, and the lid heat insulator 41 was attached inside the battery lid 40 so as to surround the spark plug 21. The spark plug 21 was press-fitted into the battery case 39 together with the power generator 31 and the heat insulator 37 and sealed with a battery lid 40. At this time, a ceramic fiber material mainly composed of alumina and silica was used for the heat insulator 37, and this was filled in the bottom and side portions of the power generator 31. In addition, the same material as Example 1 was used for the lead wire 22, the holding body 23, the electric bridge wire 24, and the ignition agent 25a. Moreover, polyethylene terephthalate was used for the resin part 25 which covers the ignition agent 25a.
The power generator 31 was obtained by the same method as in Example 1 except that the diameter of the heat conduction hole was set to 3.0 mm.

  Twenty thermal batteries of Examples 1 to 4 and Comparative Examples 1 to 3 prepared above were prepared, and the batteries were left in an environment of −50 ° C. until the temperature inside the battery was −50 ° C. . Then, a predetermined current was supplied to the ignition terminal of the thermal battery in an environment of −50 ° C., and it was examined whether the voltage would normally rise to a predetermined voltage within a predetermined time. The results are shown in Table 1.

  From Table 1, it was found that in Examples 1 to 4 having a D / B of 0.6 to 9.0, all the batteries started up normally and the voltage rise characteristics were good. On the other hand, in the case of Comparative Example 2 having a D / B of less than 0.6, it was difficult for the flame to reach the entire heat conduction hole, and a battery that did not start normally was observed. Further, in the case of Comparative Example 1 where D / B exceeds 9.0, the heat conduction hole is increased, the reaction area of the unit cell is reduced, and the current flowing per unit area is increased, so that the internal resistance is increased. Some batteries did not start properly. Moreover, in the comparative example 3, since the flame emitted from the spark plug did not reach | attain uniformly to a fire conduction hole, the battery which does not start normally was seen.

<< Examples 5 to 8 and Comparative Examples 4 to 5 >>
As shown in Table 2, the diameter A of the explosive part in the spark plug composite, the diameter C of the hole in the lid heat insulator, the diameter B of the opening in the spark plug composite, and the diameter D of the heat conduction hole in the power generator are various. A thermal battery was produced in the same manner as in Example 1 except that the above was changed. Then, whether or not the voltage rises normally under the same conditions as described above was examined for these thermal batteries. The results are shown in Table 2 together with the results of the conventional comparative example 3.

  From Table 2, in Examples 5-8, it turned out that all the batteries start normally and a voltage rise characteristic is favorable. In the case of Comparative Example 5 where C / B is less than 0.6, the diameter of the hole in the lid heat insulator becomes too small, and it becomes difficult for the flame to reach the entire heat conduction hole in the power generation body, so it does not start normally. A battery was found. In the case of Comparative Example 4 in which C / B exceeds 9.0, the hole of the lid heat insulator becomes too large and the flame tends to spread, so the power of the flame is reduced and the flame is difficult to reach far away. Some batteries did not start properly.

<< Examples 9 to 12 and Comparative Examples 6 to 7 >>
As shown in Table 3, the diameter A of the explosive portion in the spark plug composite, the diameter B of the opening in the spark plug composite, the diameter C of the hole in the lid heat insulator, and the diameter D of the heat conduction hole in the power generator A thermal battery was produced in the same manner as in Example 1 except that the above was changed. Then, whether or not the voltage rises normally under the same conditions as described above was examined for these thermal batteries. The results are shown in Table 3 together with the results of the conventional comparative example 1.

  From Table 3, in Examples 9-12, it turned out that all the batteries start normally and the outstanding voltage rise characteristic is acquired. In the case of Comparative Example 7 where A / B was less than 1.1, it was difficult to fix the explosive part, so that the flame did not reach the heat conduction holes uniformly, and a battery that did not start normally was observed. In the case of Comparative Example 6 in which A / B exceeds 25.0, the spark plug complex is large, the amount of the ignition agent and the ignition agent is increased, the voltage is fluctuated, and the battery that does not start normally is seen. It was.

  As described above, the thermal battery according to the present invention can be applied to a high-performance power supply for induction equipment, an emergency power supply, and the like because it can be surely and quickly started.

It is a schematic longitudinal cross-sectional view of the thermal battery of this invention. FIG. 2 is an enlarged cross-sectional view of a portion X (near a spark plug complex) in FIG. 1. It is an exploded sectional view of the ignition plug complex in the thermal battery of the present invention. It is an exploded sectional view of other spark plug composites in the thermal battery of the present invention. It is a schematic longitudinal cross-sectional view of the conventional thermal battery. It is a schematic longitudinal cross-sectional view of the vicinity of the ignition plate of the electric power generation body of FIG. It is a disassembled perspective view of the ignition board of FIG. It is a schematic longitudinal cross-sectional view of the electric power generation body enclosed by the igniting zone of FIG. It is a schematic longitudinal cross-sectional view of the ignition plug in the conventional thermal battery.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31 Power generation body 2,32 Fire conduction hole 3,33 Fire conduction zone 4a, 4b, 34a, 34b Internal lead board 5a, 5b, 35a, 35b Output terminal 6 Cover part heat insulating body 6a Groove part 6b Hole 7, 37 Heat insulating body 8, 38 Battery container 9, 39 Battery case 10, 40 Battery lid 10a Hole 10b Lid 11 Spark plug composite 12, 22 Lead wire 13, 23 Holding body 14, 24 Electric bridge wire 15a, 25a Ignition agent 15b, 25b Ignition powder 16, 26 Cylindrical member 17 Gunpowder part 18, 28 Plate-like member 19, 29 Frame body 20, 30 Opening part 21 Spark plug 25 Resin part 42 Unit cell 43 Heating agent 44 Igniting plate 45 Igniting agent 46 Metal plate 47 Metal 48 pieces of laminated body block

Claims (5)

A power generator having a heat conduction hole in the center;
An ignition plug composite comprising an ignition plug and a frame for housing the ignition plug;
A groove portion for fixing and accommodating the spark plug complex, and a lid heat insulator having a hole communicating from the groove portion to the fire conduction hole,
The frame body has an opening for emitting a flame from the spark plug toward the heat conduction hole on the bottom surface,
The opening, the hole, and the fire conduction hole are arranged coaxially,
The thermal battery, wherein a ratio of the diameter of the heat conduction hole to the diameter of the opening is 0.6 to 9.0. A power generator having a heat conduction hole in the center;
A spark plug composite comprising a spark plug and a frame for housing the spark plug;
A groove portion for fixing and housing the spark plug composite, and a lid heat insulator having a hole communicating from the groove portion to the fire conduction hole,
The frame body has an opening for emitting a flame from the ignition plug toward the heat conduction hole on the bottom surface,
The opening, the hole, and the fire conduction hole are arranged coaxially,
A ratio of the diameter of the hole to the diameter of the opening is 0.6 to 9.0. A power generator having a heat conduction hole in the center;
A holding body for holding a pair of lead wires, an electric bridge wire connecting the pair of lead wires, an ignition plug made of an ignition agent covering the electric bridge wire, an ignition agent arranged in front of the ignition plug, the ignition A spark plug composite comprising a cylindrical member that holds a stopper and an ignition powder, a frame that houses the cylindrical member, and a plate-like member that is disposed between the opening of the frame and the ignition powder;
A groove portion for fixing and housing the spark plug composite, and a lid heat insulator having a hole communicating from the groove portion to the fire conduction hole,
The frame body has an opening for emitting a flame from the ignition plug toward the heat conduction hole on the bottom surface,
The opening, the hole, and the fire conduction hole are arranged coaxially,
The ratio of the diameter of the said ignition powder and the ignition powder with respect to the diameter of the said opening part is 1.1-25.0, The thermal battery characterized by the above-mentioned.   The thermal battery according to claim 1, wherein the opening has a plurality of openings.   The said frame has a recessed part or a convex part in the bottom face part, and the said cover heat insulating body has a convex part or a recessed part which fits the said recessed part or a convex part in the bottom face part of the said groove part. The thermal battery according to any one of the above.

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