JP2016021346A - Thermal battery and rotating flying object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal battery and rotating flying object capable of facilitating leakage suppression of electrolyte.SOLUTION: A thermal battery 20 includes a first heating element 101, a second heating element 102, a first power generation cell 111, a first heat absorption member 121 with electrical insulation properties, and a first leakage prevention member 131. The first heat absorption member 121 is disposed outside the first power generation cell 111. The first leakage prevention member 131 is disposed outside the first heat absorption member 121. The heat conductivity of the first heat absorption member 121 is higher than that of the first leakage prevention member 131.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a thermal battery and a rotating flying object.

  2. Description of the Related Art Conventionally, thermal batteries that can be stored for a long period of time and instantly generate power are widely used as power supply sources such as cannonballs and missiles. The thermal battery includes heating elements and power generation cells that are alternately stacked. The power generation cell includes a positive electrode, an electrolyte, and a negative electrode that are sequentially stacked. When the electrolyte is melted by the heat of combustion of the heating element, the thermal battery starts power generation.

  Here, a method of filling an electrolyte holding body constituted by a plurality of small chambers with an electrolyte has been proposed (see Patent Document 1). According to this method, it is said that the performance deterioration of the thermal battery can be suppressed by suppressing the molten electrolyte from leaking out due to centrifugal force.

JP-A-8-106912

  However, it is not easy to form a fine chamber in the electrolyte holder or to fill the fine chamber with a solid electrolyte.

  The present invention has been made in view of the above-described situation, and an object thereof is to provide a thermal battery and a rotating flying body that can easily suppress leakage of an electrolyte.

  The thermal battery according to the first aspect of the present invention includes a first heating element, a second heating element, a power generation cell, an electrically insulating heat absorbing member, and a liquid leakage preventing member. The second heating element faces the first heating element. The power generation cell is disposed between the first heating element and the second heating element, and includes a positive electrode, an electrolyte, and a negative electrode that are sequentially stacked. The heat absorbing member is disposed between the first heating element and the second heating element, and is disposed outside the power generation cell. The liquid leakage preventing member is disposed between the first heating element and the second heating element, and is disposed outside the heat absorbing member. The thermal conductivity of the heat absorbing member is higher than the thermal conductivity of the liquid leakage preventing member.

  According to the thermal battery of the first aspect of the present invention, since the liquid leakage preventing member is disposed outside the power generation cell, it is possible to suppress the molten electrolyte from exuding to the outside due to the centrifugal force. Moreover, since the heat absorption member with high thermal conductivity is arranged inside the liquid leakage prevention member, excess heat that has not been transmitted from the first heat generating element and the second heat generating element to the liquid leakage prevention member is caused by the heat absorption member. Can be absorbed quickly. Therefore, it is possible to suppress the outer peripheral portion of the electrolyte from being locally heated by transmitting the excess heat to the power generation cell, and thus it is possible to suppress a decrease in the viscosity of the molten electrolyte and make it difficult to leak to the outside. As described above, leakage of the electrolyte can be easily suppressed.

  The thermal battery according to the second aspect of the present invention relates to the first aspect, and the density of the heat absorbing member is larger than the density of the liquid leakage preventing member.

  According to the thermal battery of the second aspect of the present invention, surplus heat of the first heating element and the second heating element can be absorbed more quickly by the heat absorbing member.

  The thermal battery according to the third aspect of the present invention relates to the first or second aspect, and the heat absorbing member is a ceramic sintered body.

  According to the thermal battery of the third aspect of the present invention, the heat absorbing member can have not only high thermal conductivity, high heat resistance, and electrical insulation, but also high strength.

  A thermal battery according to a fourth aspect of the present invention relates to any one of the first to third aspects, and the liquid leakage preventing member is a ceramic fiber.

  According to the thermal battery of the fourth aspect of the present invention, the liquid leakage preventing member can be provided with flexibility as well as high heat resistance and electrical insulation.

  The rotating flying object according to the fifth aspect of the present invention is a rotating flying object capable of flying while rotating about the rotation axis. The rotary flying body includes a main body and the thermal battery according to any one of claims 1 to 4 disposed inside the main body.

  According to the rotary flying object according to the fifth aspect of the present invention, the molten electrolyte can be prevented from exuding to the outside by centrifugal force, and the melted electrolyte can be prevented from being leaked to the outside by suppressing the decrease in the viscosity. can do.

  The rotary flying body according to the sixth aspect of the present invention relates to the fifth aspect, and the first heating element and the second heating element intersect the rotation axis perpendicularly. The heat absorbing member surrounds the entire outside of the power generation cell. The leak preventing member surrounds the entire outside of the heat absorbing member.

  According to the rotary flying object according to the sixth aspect of the present invention, leakage of the electrolyte can be suppressed even when centrifugal force is applied in all directions around the rotation axis.

  The rotary flying body according to the seventh aspect of the present invention relates to the fifth aspect, and the first heating element and the second heating element are arranged in parallel to the rotation axis. The heat absorbing member includes first and second heat absorbing portions that extend in parallel with the rotation axis on both outer sides of the power generation cell. The liquid leakage prevention member has first and second liquid leakage prevention portions that extend in parallel with the rotation axis on both outer sides of the first and second heat absorption portions, respectively.

  According to the rotary flying body according to the seventh aspect of the present invention, it is possible to reduce the manufacturing cost by reducing the amount of the material used while suppressing the leakage of the electrolyte.

  ADVANTAGE OF THE INVENTION According to this invention, the thermal battery and rotary flying body which can suppress the leakage of an electrolyte simply can be provided.

The perspective view which shows the external appearance of the shell which concerns on 1st Embodiment. Sectional drawing of the thermal battery which concerns on 1st Embodiment Partial enlarged view of FIG. The perspective view which shows the external appearance of the shell which concerns on 2nd Embodiment. The perspective view of the thermal battery which concerns on 2nd Embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  In the following embodiments, a configuration of a shell will be described as an example of a rotating flying object. In the following description, “front” and “rear” are terms based on the traveling direction of the bullet 1 in flight.

<First Embodiment>
(Overall configuration of cannonball 1)
The overall configuration of the cannonball 1 will be described with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a shell 1 in flight. The cannonball 1 flies while rotating about the rotation axis P. The cannonball 1 includes a main body 10 and a thermal battery 20.

  The main body 10 forms the outer shape of the shell 1. The main body 10 includes a rear bullet body 11 and a front bullet body 12. The rear bullet 11 is formed in a columnar shape with the rotation axis P as the center. The rear bullet 11 is connected to the rear end of the front bullet 12. The rear bullet 11 may contain a glaze (not shown). The front bullet 12 is connected to the front end of the rear bullet 11. In addition to the thermal battery 20, the front bullet 12 houses electrical components (not shown) such as a fuze, a control CPU, and a GPS receiver.

  When the thermal battery 20 is ignited, it immediately starts power generation and supplies power to each electrical component. The thermal battery 20 is disposed inside the front bullet 12 of the main body 10. The thermal battery 20 according to the present embodiment has a cylindrical outer shape. The rotation axis P of the cannonball 1 passes through the approximate center of the thermal battery 20. That is, the thermal battery 20 is placed vertically with respect to the traveling direction.

(Configuration of thermal battery 20)
Next, the configuration of the thermal battery 20 will be described with reference to the drawings. FIG. 2 is a cross-sectional view of the thermal battery 20. FIG. 3 is a partially enlarged view of FIG.

  The thermal battery 20 includes a housing 21, a heat insulating member 22, a pair of output terminals 23, an igniter 24, a igniting material 25, and a power generation unit 26.

The housing 21 is a container that houses the heat insulating member 22 and the power generation unit 26. The heat insulating member 22 surrounds the power generation unit 26. The heat insulating member 22 keeps the power generation unit 26 warm. As a material of the heat insulating member 22, use a material having low thermal conductivity (1 W / m · K or less), high heat resistance (500 ° C. or more), liquid absorbency and electrical insulation (1 × 10 ⁹ Ωcm or more). For example, ceramic fibers (inorganic fibers mainly composed of alumina and silica) are suitable.

  The pair of output terminals 23 are terminals for taking out current from the power generation unit 26 to the outside via the pair of connection members 23a. When the current is supplied, the igniter 24 ignites sparks and ignites the conductive material 25. The heat conducting material 25 is disposed along the rotation axis P. When the igniter 24 is ignited by the igniter 24, the igniting material 25 spreads and ignites substantially simultaneously on first to fourth heating elements 101 to 104 described later.

  The power generation unit 26 includes first to fourth heating elements 101 to 104, first to third power generation cells 111 to 113, first to third heat absorption members 121 to 123, and first to third liquid leakage preventions. Members 131-133.

  The first to fourth heating elements 101 to 104 are formed in a disc shape. The first to fourth heating elements 101 to 104 are arranged so as to intersect the rotation axis P perpendicularly. The first to fourth heating elements 101 to 104 are arranged to face each other. The first to fourth heating elements 101 to 104 are separated by a predetermined interval in the traveling direction. The first to third power generation cells 111 to 113 are disposed between the first to fourth heating elements 101 to 104, respectively. When the first to fourth heating elements 101 to 104 are ignited by the igniting material 25, the first to fourth heating elements 101 to 104 spread and heat the first to third power generation cells 111 to 113. The 1st thru | or 4th heat generating elements 101-104 are comprised by the mixture of metal powder and an oxidizing agent, for example.

  Each of the first to third power generation cells 111 to 113 is disposed between each of the first to fourth heating elements 101 to 104. Each of the first to third power generation cells 111 to 113 includes a positive electrode 100a, an electrolyte 100b, and a negative electrode 100c that are sequentially stacked in the traveling direction. The positive electrode 100 a of the first power generation cell 111 is in contact with the first heating element 101, and the negative electrode 100 c of the first power generation cell 111 is in contact with the second heating element 102. The electrolyte 100b is sandwiched between the positive electrode 100a and the negative electrode 100c.

  The positive electrode 100a can be made of, for example, iron disulfide. The electrolyte 100b can be composed of, for example, a eutectic mixture of lithium chloride and potassium chloride. The negative electrode 100c can be made of, for example, lithium silicon.

  When the first to fourth heating elements 101 to 104 burn and spread to a high temperature and the electrolyte 100b melts, power generation of the thermal battery 20 starts instantaneously. At this time, if the outer peripheral portion of the electrolyte 100b is locally heated, the viscosity of the molten electrolyte 100b decreases. Since the centrifugal force is applied to the electrolyte 100b in all directions around the rotation axis P, the molten electrolyte 100b easily leaks to the outside. Therefore, the electrolyte 100b is preferably heated to a uniform temperature as a whole.

  Each of the first to third heat absorbing members 121 to 123 is disposed between each of the first to fourth heating elements 101 to 104. The first to third heat absorbing members 121 to 123 are disposed outside the first to third power generation cells 111 to 113, respectively.

  In the present embodiment, each of the first to third heat absorbing members 121 to 123 is formed in an annular shape with the rotation axis P as the center. Each of the first to third heat absorption members 121 to 123 surrounds the entire outside of each of the first to third power generation cells 111 to 113. That is, the first heat absorbing member 121 covers the outer peripheral surface of the first power generation cell 111, the second heat absorbing member 122 covers the outer peripheral surface of the second power generating cell 112, and the third heat absorbing member 123 is the third power generating cell 113. The outer peripheral surface of is covered. The first to third heat absorbing members 121 to 123 may be in contact with the outer peripheral surfaces of the first to third power generation cells 111 to 113, respectively, but may be slightly separated from each other.

  The thermal conductivity of each of the first to third heat absorbing members 121 to 123 is higher than the thermal conductivity of each of the first to third leakage preventing members 131 to 133. The thermal conductivity of each of the first to third heat absorbing members 121 to 123 can be equal to or higher than the thermal conductivity of each of the first to third power generation cells 111 to 113. The density (mass per unit volume) of each of the first to third heat absorbing members 121 to 123 is larger than the density of each of the first to third liquid leakage preventing members 131 to 133. The density of each of the first to third heat absorbing members 121 to 123 can be equal to or higher than the density of each of the first to third power generation cells 111 to 113.

Examples of the material of the first to third heat absorbing members 121 to 123 include high thermal conductivity (1 W / m · K or higher), high heat resistance (500 ° C. or higher), and electrical insulation (1 × 10 ⁹ Ωcm MΩ or higher). For example, a ceramic sintered body such as alumina is suitable. The thermal conductivity of the first to third heat absorbing members 121 to 123 is preferably 20 W / m · K or more, and particularly preferably 30 W / m · K or more. Density of the first through third heat-absorbing member 121 to 123, preferably from 2 g / cm ³ or more, 2.5 g / cm ³ or more is particularly preferable.

  The first to third liquid leakage preventing members 131 to 133 are disposed between the first to fourth heating elements 101 to 104, respectively. The first to third liquid leakage prevention members 131 to 133 are disposed outside the first to third heat absorption members 121 to 123, respectively.

  In the present embodiment, each of the first to third liquid leakage preventing members 131 to 133 is formed in an annular shape centering on the rotation axis P. Each of the first to third liquid leakage prevention members 131 to 133 surrounds the entire outside of each of the first to third heat absorption members 121 to 123. That is, the first liquid leakage prevention member 131 covers the outer peripheral surface of the first heat absorption member 121, the second liquid leakage prevention member 132 covers the outer peripheral surface of the second heat absorption member 122, and the third liquid leakage prevention member 133 is The outer peripheral surface of the third heat absorbing member 123 is covered. Each of the first to third liquid leakage preventing members 131 to 133 may be in contact with the outer peripheral surface of each of the first to third heat absorbing members 121 to 123.

  The thermal conductivity of each of the first to third liquid leakage preventing members 131 to 133 is lower than the thermal conductivity of each of the first to third heat absorbing members 121 to 123. The thermal conductivity of each of the first to third liquid leakage preventing members 131 to 133 can be made equal to the thermal conductivity of the heat insulating member 22. The density of each of the first to third liquid leakage prevention members 131 to 133 is smaller than the density of each of the first to third heat absorption members 121 to 123. The density of each of the first to third liquid leakage preventing members 131 to 133 can be made equal to the density of the heat insulating member 22.

Examples of the materials of the first to third liquid leakage preventing members 131 to 133 include high heat resistance (500 ° C. or higher), flexibility (a degree of contraction when the power generation unit 26 is assembled), and electrical insulation (1 × 10 ^9). For example, cotton-like ceramic fibers (inorganic fibers mainly composed of alumina and silica) are preferable. Density of the first to third liquid leakage preventing member 131 to 133, preferably from 2 g / cm ³ or less, 1 g / cm ³ or less is particularly preferred. The thermal conductivity of the first to third liquid leakage preventing members 131 to 133 only needs to be lower than the thermal conductivity of the first to third heat absorbing members 121 to 123, and the numerical value is not particularly limited.

(Function and effect)
(1) The thermal battery 20 includes a first heating element 101, a second heating element 102, a first power generation cell 111, an electrically insulating first heat absorbing member 121, and a first liquid leakage preventing member 131. Prepare. The first heat absorbing member 121 is disposed outside the first power generation cell 111. The first liquid leakage preventing member 131 is disposed outside the first heat absorbing member 121. The thermal conductivity of the first heat absorbing member 121 is higher than the thermal conductivity of the first liquid leakage preventing member 131.

  Thus, since the 1st liquid leakage prevention member 131 is arrange | positioned on the outer side of the 1st electric power generation cell 111, it can suppress that the melted electrolyte exudes outside the electric power generation part 26 with a centrifugal force. In addition, since the first heat absorbing member 121 having high thermal conductivity is disposed inside the first liquid leakage preventing member 131, the first liquid leakage preventing member 131 is changed from the first heat generating element 101 and the second heat generating element 102. Excess heat that has not been transmitted can be quickly absorbed by the first heat absorbing member 121. Accordingly, since the excess heat is transmitted to the first power generation cell 111, it is possible to suppress the outer peripheral portion of the electrolyte 100b from being locally overheated. Therefore, it is possible to suppress a decrease in the viscosity of the molten electrolyte 100b and to prevent leakage to the outside. be able to. As described above, it is possible to easily suppress the performance degradation of the thermal battery that occurs due to the short circuit between the power generation cells due to leakage of the electrolyte 100b or the increase in the internal resistance of each power generation cell due to the decrease in the electrolyte 100b.

  (2) The density of the first heat absorbing member 121 is greater than the density of the first liquid leakage preventing member 131. Accordingly, surplus heat of the first heating element 101 and the second heating element 102 can be absorbed more quickly by the first heat absorbing member 121.

  (3) The first heat absorbing member 121 is a ceramic sintered body. Accordingly, the first heat absorbing member 121 can have high strength as well as high thermal conductivity, high heat resistance, and electrical insulation.

  (4) The first liquid leakage preventing member 131 is a ceramic fiber. Therefore, the first liquid leakage preventing member 131 can be provided with flexibility as well as high heat resistance and electrical insulation.

  (5) The first heating element 101 and the second heating element 102 intersect the rotation axis P of the cannonball 1 perpendicularly. The first heat absorbing member 121 surrounds the entire outside of the first power generation cell 111. The first liquid leakage preventing member 131 surrounds the entire outside of the first heat absorbing member 121. Therefore, even when centrifugal force is applied in all directions around the rotation axis P, leakage of the electrolyte 100b can be reliably suppressed.

Second Embodiment
Below, the whole structure of the cannonball 1A which concerns on 2nd Embodiment is demonstrated, referring drawings. The differences between the shell 1 according to the first embodiment and the shell 1A according to the second embodiment are the arrangement of the thermal battery 20, the first to third heat absorbing members 121 to 123, and the first to third liquid leakage preventing members. Since it is the structure of 131-133, the said difference is mainly demonstrated below.

  FIG. 4 is a perspective view showing the external appearance of the cannonball 1A. As shown in FIG. 4, the thermal battery 20 </ b> A is placed horizontally with respect to the traveling direction. The thermal battery 20A according to the present embodiment has a prismatic outer shape. The thermal battery 20 </ b> A is spaced from the rotation axis P of the cannonball 1 in the radial direction.

  FIG. 5 is a perspective view of the thermal battery 20A. However, in FIG. 5, the casing 21, the heat insulating member 22, the pair of output terminals 23, the igniter 24, and the igniting material 25 are omitted.

  As shown in FIG. 5, the power generation unit 26A includes first to fourth heating elements 101 to 104, first to third power generation cells 111 to 113, first to third heat absorption members 121A to 123A, 1st thru | or 3rd leak prevention member 131A-133A.

  The configurations of the first to fourth heating elements 101 to 104 and the first to third power generation cells 111 to 113 are as described in the first embodiment. However, in the present embodiment, the first to fourth heating elements 101 to 104 are arranged in parallel with the rotation axis P.

  The first heat absorbing member 121A includes a first heat absorbing part 200a and a second heat absorbing part 200b. Each of the 1st heat absorption part 200a and the 2nd heat absorption part 200b is formed in strip shape. The first heat absorption unit 200 a and the second heat absorption unit 200 b are arranged in parallel to the rotation axis P on both outer sides of the first power generation cell 111. That is, the first heat absorption unit 200a and the second heat absorption unit 200b are arranged so as to sandwich both end portions of the first power generation cell 111 in the direction perpendicular to the rotation axis P. Each of the second and third heat absorbing members 122A and 123A has the same configuration as the first heat absorbing member 121A.

  The first liquid leakage prevention member 131A includes a first liquid leakage prevention part 300a and a second liquid leakage prevention part 300b. Each of the first liquid leakage prevention part 300a and the second liquid leakage prevention part 300b is formed in a strip shape. The first liquid leakage prevention part 300a and the second liquid leakage prevention part 300b are arranged in parallel with the rotation axis P on both outer sides of the first heat absorption part 200a and the second heat absorption part 200b. That is, the first liquid leakage prevention unit 300a is disposed along the outer surface of the first heat absorption unit 200a, and the second liquid leakage prevention unit 300b is disposed along the outer surface of the second heat absorption unit 200b.

(Function and effect)
(1) Since the first liquid leakage prevention member 131 is disposed outside the first power generation cell 111, it is possible to suppress the molten electrolyte from oozing out of the power generation unit 26 due to centrifugal force. In addition, since the first heat absorbing member 121 having high thermal conductivity is disposed inside the first liquid leakage preventing member 131, the first liquid leakage preventing member 131 is changed from the first heat generating element 101 and the second heat generating element 102. Excess heat that has not been transmitted can be quickly absorbed by the first heat absorbing member 121. As described above, it is possible to easily suppress the performance degradation of the thermal battery that occurs due to the short circuit between the power generation cells due to leakage of the electrolyte 100b or the increase in the internal resistance of each power generation cell due to the decrease in the electrolyte 100b.

  (2) The first heating element 101 and the second heating element 102 are arranged parallel to the rotation axis P. The first heat absorbing member 121 </ b> A includes first and second heat absorbing portions 200 a and 200 b that extend in parallel with the rotation axis P on both outer sides of the first power generation cell 111. The first liquid leakage preventing member 131A includes first and second liquid leakage preventing portions 300a and 300b extending in parallel with the rotation axis P on both outer sides of the first and second heat absorbing portions 200a and 200b, respectively. Therefore, compared to the case where the first heat absorbing member 121 surrounds the entire circumference of the first power generation cell 111 and the first liquid leakage preventing member 131 surrounds the entire circumference of the first heat absorbing member 121, By reducing the amount used, the manufacturing cost can be reduced. In the present embodiment, since the amount of electrolyte 100b leaking from the top and bottom of the first power generation cell 111 is small, only the left and right of the first power generation cell 111 are covered with the first heat absorbing member 121A and the first liquid leakage preventing member 131A. Thus, leakage of the electrolyte 100b can be suppressed.

<Other embodiments>
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  (A) In the first and second embodiments, the shell has been described as an example of the rotating projectile, but the present invention is not limited to this. Examples of the rotating flying object include guided bullets, rocket bullets, and missiles. Of course, the above effect can be obtained even in a missile having a lower number of revolutions per hour than a shell.

  (B) In the first embodiment, the thermal battery 20 is formed in a cylindrical shape, and in the second embodiment, the thermal battery 20A is formed in a prismatic shape. However, the present invention is not limited to this. The outer shape of the thermal battery 20 may be appropriately modified according to the shape of the space secured inside the shell 1.

  (C) In the first embodiment, the rotation axis P passes through the center of the thermal battery 20, but the present invention is not limited to this. The center of the thermal battery 20 may be eccentric from the rotation axis P.

  (D) In the first and second embodiments, the thermal battery 20 is provided with the igniter 25. However, when the flame generated from the igniter 24 is scattered in the space, the heating element can be ignited. May not be provided with the heat conducting material 25.

  (E) In the first and second embodiments, the power generation unit 26 includes four heating elements and three power generation cells. However, the number is not particularly limited.

  (F) In the first and second embodiments, the negative electrode 100c is in contact with the heating element. However, a metal plate for suppressing a temperature rise of the negative electrode 100c having a low melting point between the negative electrode 100c and the heating element. May be inserted.

  (G) In the first and second embodiments, the heat absorbing member and the leakage preventing member are provided for each power generation cell. However, heat absorption is performed for at least one power generation cell among the plurality of power generation cells. If the member and the liquid leakage preventing member are provided, a predetermined effect can be obtained.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 Cannonball 10 Main body 11 Rear bullet 12 Front bullet 20 Thermal battery 21 Case 22 Heat insulation member 23 Output terminal 24 Igniter 25 Fire material 26 Power generation part 100a Positive electrode 100b Electrolyte 100c Negative electrode 101-104 First to fourth heat generation Body 111-113 1st thru | or 3rd power generation cell 121-123 1st thru | or 3rd heat absorption member 131-133 1st thru | or 3rd leak prevention member 200a, 200b 1st and 2nd heat absorption part 300a, 300b 1st And second liquid leakage prevention part

Claims (7)

A first heating element;
A second heating element facing the first heating element;
A power generation cell having a positive electrode, an electrolyte, and a negative electrode disposed between the first heating element and the second heating element and sequentially stacked;
An electrically insulating heat absorbing member disposed between the first heat generating element and the second heat generating element and disposed outside the power generation cell;
A liquid leakage preventing member disposed between the first heating element and the second heating element and disposed outside the heat absorbing member;
With
The thermal conductivity of the heat absorbing member is higher than the thermal conductivity of the liquid leakage preventing member,
Thermal battery. The density of the heat absorbing member is greater than the density of the liquid leakage preventing member,
The thermal battery according to claim 1. The heat absorbing member is a ceramic sintered body.
The thermal battery according to claim 1 or 2. The liquid leakage preventing member is a ceramic fiber.
The thermal battery according to any one of claims 1 to 3. A rotating projectile capable of flying while rotating about a rotation axis,
The body,
The thermal battery according to any one of claims 1 to 4, which is disposed inside the main body,
Rotating projectile with The first heating element and the second heating element intersect the rotation axis perpendicularly,
The heat absorbing member surrounds the entire outside of the power generation cell;
The liquid leakage preventing member surrounds the entire outside of the heat absorbing member,
The rotary flying object according to claim 5. The first heating element and the second heating element are arranged in parallel with the rotation axis,
The heat absorbing member has first and second heat absorbing portions extending in parallel with the rotation axis on both outer sides of the power generation cell,
The liquid leakage prevention member has first and second liquid leakage prevention portions that extend in parallel with the rotation axis on both outer sides of the first and second heat absorption portions, respectively.
The rotary flying object according to claim 5.

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