JP7773408B2 - Load Sensor - Google Patents

Description

The present invention relates to a load sensor having a metal-air battery configuration.

Detection sensors that detect the movement of objects have been known for some time, but those that require an external power source require regular maintenance, and depending on the usage environment, obtaining an external power source can be difficult or even impossible. Therefore, there was a demand for a detection sensor that does not require an external power source.

JP 2015-141684 A

The invention described in Patent Document 1 discloses a battery activation device that activates a battery when an external force is applied.

In the battery start-up device, the magnetic destructible section is accelerated by an external force, destroying the partition between the electrolyte storage section and the electrode storage section, causing the electrolyte to leak out and come into contact with the electrodes, starting the battery.

In this way, in the configuration of Patent Document 1, the destructive portion (magnetic body) moves at an accelerated rate within the cylindrical portion, accelerating the movement and causing the electrolyte to leak out due to the impact, which makes the structure complicated and large. Moreover, the destructive portion cannot destroy the electrolyte storage portion unless it achieves a certain acceleration, and the device is limited to applications where an impact strong enough to destroy the partition between the electrolyte storage portion and the electrode storage portion is applied.
The present invention has been made in view of the above points, and an object of the present invention is to provide a self-power-generating load sensor that starts generating power when a load is applied.

The load sensor of the present invention comprises a metal-air battery having a metal electrode and an air electrode, an electrolyte pack containing an electrolyte, and a load surface that receives a load, wherein a compressive load acts on the electrolyte pack from the load surface, causing the electrolyte to leak from the electrolyte pack, and the electrolyte is supplied to the metal-air battery to generate electricity, and wherein a support member is provided that supports the load surface and allows the load surface to move in the direction in which the compressive load acts, and the electrolyte pack is positioned inside the support member .
In the present invention, it is preferable that the electrolyte pack is destroyed, causing the electrolyte to leak and generate electricity.

In the present invention, it is preferable that the load surface is bendable, and that the load surface bends under the load, causing the electrolyte to leak from the electrolyte pack.
Alternatively, in the present invention, it is preferable that a tensile load acts on the electrolyte pack from the load surface, causing the electrolyte to leak from the electrolyte pack.
In the present invention, the load surface is preferably configured by a surface of the metal electrode, a surface of the air electrode, or a surface of a member other than the metal-air battery.

In the present invention, it is preferable that a housing is provided to house the metal-air battery, the housing has a load-bearing surface, and the electrolyte pack is disposed between the housing and the metal-air battery.

The present invention provides a self-powered load sensor that generates electricity when subjected to a load.

FIG. 1A is a cross-sectional view of a load sensor according to a first embodiment, and FIG. 1B is a cross-sectional view showing a state of the load sensor of FIG. 1A after it receives a load. FIG. 2A is a cross-sectional view of a load sensor according to a second embodiment, and FIG. 2B is a cross-sectional view showing a state after the load sensor of FIG. 2A receives a load. FIG. 3A is a cross-sectional view of the load sensor according to the third embodiment, and FIG. 3B is a cross-sectional view showing the load sensor of FIG. 3A in a state after receiving a load. FIG. 4A is a cross-sectional view of the load sensor according to the fourth embodiment, and FIG. 4B is a cross-sectional view showing the load sensor of FIG. 4A in a state after receiving a load. FIG. 5A is a cross-sectional view of a load sensor according to a fifth embodiment, and FIG. 5B is a cross-sectional view showing a state after the load sensor of FIG. 5A receives a load. 1 is a block diagram of a detection device including a load sensor according to an embodiment of the present invention.

One embodiment of the present invention (hereinafter abbreviated as "embodiment") will be described in detail below. Note that the present invention is not limited to the following embodiment, and various modifications can be made within the scope of its gist.

<Background to the Load Sensor of the Present Embodiment>
Sensors that can detect the movement of objects, etc., that require an external power source require operational inspections and are unsuitable for use in environments where it is difficult to install an external power source, such as outdoors. Therefore, there was a demand for self-powered detection sensors that do not require an external power source.

For example, Patent Document 1 discloses an invention for a battery activation device that does not require an external power source and activates the battery when a specified event occurs. However, this is a large-scale device that activates the battery by encouraging destruction through the collision of a destructive part made of a magnetic material, resulting in a complex and large structure.

As a result of intensive research, the inventors have developed a load sensor that, when subjected to a load, causes electrolyte to leak from the electrolyte pack containing the electrolyte, thereby starting power generation.

<Description of Load Sensor 1 in First Embodiment>
FIG. 1A is a cross-sectional view of a load sensor 1 according to a first embodiment, and FIG. 1B is a cross-sectional view showing a state after the load sensor 1 of FIG. 1A receives a load.

The load sensor 1 shown in Figure 1A includes a metal-air battery 5 having a metal electrode 2, an air electrode 3, and a separator 4 interposed between the metal electrode 2 and the air electrode 3. The metal-air battery 5 is housed in a housing 6 having a holder 6a with a mounting surface for the metal-air battery 5 and a lid 6b covering the front side of the metal-air battery. An electrolyte pack 9, in which electrolyte 7 is housed in a container 8, is disposed between the metal-air battery 5 and the lid 6b.

As shown in Figure 1A, the air electrode 3 faces the surface of the holder 6a, and the metal electrode 2 faces the electrolyte pack 9. Although not shown, for example, the holder 6a may have holes through which air can come into contact with the air electrode 3. However, it is not necessary to provide holes in the holder 6a.

Although not limited to this, the metal electrode 2 and air electrode 3 can be formed in the form of thin sheets, and can be formed as a thin-film laminate structure in which the metal electrode 2, air electrode 3, and separator 4 are stacked. For example, the thickness of the metal electrode 2 is approximately 0.05 to 5.0 mm, and the thickness of the air electrode 3 (including the current collector) is approximately 0.4 to 2.0 mm. The distance between the metal electrode 2 and air electrode 3 can be adjusted depending on the number of separators 4 stacked and their thickness. Alternatively, the separator 4 may not be provided, or may be provided only partially, with the metal electrode 2 and air electrode 3 facing each other via a space.

In this embodiment, the metal electrode 2 and separator 4, and the air electrode 3 and separator 4 can be fixed together via an adhesive layer. In this case, the adhesive layer is partially provided on the edges of the metal electrode 2 and air electrode 3, allowing the central portions of the metal electrode 2 and air electrode 3 to function appropriately as detection areas.

The metal electrode 2 is preferably formed from magnesium (Mg), an Mg alloy, zinc (Zn), a Zn alloy, aluminum (Al), or an Al alloy. Of these, it is more preferable that the metal electrode 2 be formed from Mg or an Mg alloy.

The air electrode 3 is composed of a current collector and a catalyst layer (reaction section). The characteristics required of the current collector are electrical conductivity to transfer electrons emitted from the metal electrode 2 to the catalyst layer and breathability to allow oxygen to pass through. The configuration of the current collector is not limited, but existing materials such as wire mesh or foam metal can be used. The characteristics required of the catalyst layer are hydrophobicity to prevent liquid from being released to the outside and breathability to allow oxygen to pass through. Existing materials can be used for the catalyst layer. The catalyst layer is formed on at least one surface of the current collector, and is in close contact with the separator 4.
The separator 4 is made of a material that is electrically insulating, ion-permeable, and liquid-permeable, such as a nonwoven fabric, a woven fabric, or a porous thin film.

As shown in FIG. 1A, the separator 4 is preferably formed with an area larger than the area overlapping with the metal electrode 2 and the air electrode 3. This provides the separator 4 with protrusions 4a that protrude outward from the ends of the metal electrode 2 and the air electrode 3. The protrusions 4a are areas that come into contact with the electrolyte 7 leaking from the electrolyte pack 9. Furthermore, when the areas of the metal electrode 2 and the air electrode 3 are different, the separator 4 can be configured so that at least a portion of the separator 4 protrudes from the electrode with the smaller area. Furthermore, as long as the separator 4 is configured so that the electrolyte 7 can permeate into the separator 4 via the metal electrode 2, the separator 4 may be formed with the same area as the metal electrode 2 and the air electrode 3. For example, when the metal electrode 2 is provided with a through-hole through which the electrolyte 7 permeates the separator 4, the separator 4 may be formed with the same area as the metal electrode 2 and the air electrode 3, and the ends of the metal electrode 2, separator 4, and air electrode 3 may be aligned. Additionally, if the areas of the metal electrode 2 and the air electrode 3 are different, the separator 4 can be formed with the same area as the electrode with the smaller area.

As shown in Figure 1A, the surface S of the lid 6b arranged on the surface side of the metal-air battery 5 is the load surface (hereinafter referred to as the load surface S) that receives the load F1.

The container 8 that constitutes the electrolyte pack 9 interposed between the lid 6b and the metal-air battery 5 is, for example, a bag made of resin film or paper. However, the container 8 may also be a container made of plastic, wood, etc., as long as it is configured to be destroyed when subjected to the specified load F1.

The electrolyte pack 9 is fixed to the lid 6b and the metal-air battery 5 by adhesive or the like. Alternatively, if the lid 6b is made of a flexible material and the end of the lid 6b is fixed to the holder 6a, so that the electrolyte pack 9 is tightly sandwiched between the lid 6b and the metal-air battery 5, adhesive may be applied as needed.

In Figure 1A, a compressive load (hereinafter referred to as compressive load F1) acts on the electrolyte pack 9 from the load surface S. "Compressive load F1" refers to a force acting on the electrolyte pack 9 in a direction that compresses or crushes the electrolyte pack 9.

When a compressive load F1 is applied to the electrolyte pack 9, as shown in Figure 1B, the container 8 of the electrolyte pack 9 breaks, causing the electrolyte 7 to leak out and be supplied to the separator 4. The separator 4 has a protrusion 4a that serves as a liquid contact area, and the electrolyte 7, which may be saline solution, for example, permeates from the protrusion 4a toward the center of the separator 4, which overlaps between the metal electrode 2 and the air electrode 3.

When the electrolyte 7 permeates the separator 4, for example, when the metal electrode 2 is made of Mg, an oxidation reaction shown in the following (1) occurs on the metal electrode 2 side. Also, a reduction reaction shown in the following (2) occurs on the air electrode 3. Therefore, the reaction shown in the following (3) occurs throughout the metal-air battery 5, and electricity is generated (discharged).
(1) 2Mg → 2Mg ²⁺ +4e ^-
(2) O ₂ +2H ₂ O+4e ^- →4OH ^-
(3) 2Mg+O ₂ +2H ₂ O → 2Mg(OH) ₂

In this way, in the load sensor 1 of the first embodiment, when the electrolyte pack 9 receives a compressive load F1 from the load surface S, the electrolyte pack 9 breaks, and the electrolyte 7 is supplied between the metal electrode 2 and the air electrode 3, generating electricity.

As shown in FIG. 6, the load sensor 1 in this embodiment has a metal-air battery 5, an electrolyte pack 9, and a transmitter 51. For example, the transmitter 51 is a wireless board. In this embodiment, wireless notification is possible, but it is also possible to provide the following additional functions in addition to that function. That is, when the metal-air battery 5 is subjected to a load, a battery reaction occurs due to leakage of the electrolyte 7, causing a change in voltage value. A detection signal based on this voltage change is transmitted wirelessly from the transmitter 51 to the receiver 52. Based on the received detection signal, the receiver 52 can detect the movement of an object, etc., and take action according to the application. Note that communication is not limited to wireless communication; voltage changes can also be detected via a wired connection.

The load sensor 1 of this embodiment does not require an external power source and can detect voltage changes, for example, wirelessly or via a wire, as described above. When the detection signal obtained by the metal-air battery 5 is sent wirelessly from the transmitter 51 to the receiver 52, the wireless method is not limited, and existing methods such as wireless LAN, Bluetooth (registered trademark), and Wi-Fi can be used.
The communication configuration shown in FIG. 6 is also applicable to the embodiments shown in FIG. 2 and subsequent figures.

<Description of Load Sensor 10 in Second Embodiment>
Fig. 2A is a cross-sectional view of the load sensor 10 according to the second embodiment, and Fig. 2B is a cross-sectional view showing the load sensor 10 of Fig. 2A in a state after receiving a load. In the load sensor 10 of Fig. 2, the same parts as those in Fig. 1 are denoted by the same reference numerals as in Fig. 1.

The load sensor 10 shown in Figure 2A is provided with a support member 6c that supports the lid body 6b between itself and the holder 6a and allows the lid body 6b to move in the direction in which the compressive load F1 acts (downward in the figure). The electrolyte pack 9 is positioned inside the support member 6c.

The support member 6c has less rigidity or strength than the lid 6b. Therefore, the support member 6c is deformed or destroyed when subjected to a compressive load F1 from the load surface S. For example, the support member 6c is elastic, and the compressive load F1 shown in Figure 2A causes the lid 6b to move in a direction that compresses the support member 6c (downward in the figure). Figure 2B shows the lid 6b moved downward in the figure. As the lid 6b moves, the electrolyte pack 9 receives the compressive load F1 from the load surface S, destroying the container 8 and leaking the electrolyte 7 to the outside. The leaked electrolyte 7 permeates the separator 4 between the metal electrode 2 and the air electrode 3, starting power generation.

In the load sensor 10 shown in Figure 2A, the support member 6c can stably support the load surface S, and the support member 6c deforms or breaks depending on the set compressive load F1, allowing the measurement range of the compressive load F1 to be accurately determined.

<Description of Load Sensor 20 in Third Embodiment>
Fig. 3A is a cross-sectional view of the load sensor 20 according to the third embodiment, and Fig. 3B is a cross-sectional view showing the state of the load sensor 20 of Fig. 3A after it has received a load. In the load sensor 20, the same members as those in the load sensor 10 shown in Fig. 1A are denoted by the same reference numerals.

In the load sensor 20 shown in Figure 3A, when the load surface S on the surface of the lid body 21 receives a load F2, the lid body 21 is configured to bend downward from the center where the load F2 is received, as shown in Figure 3B.

Both ends of the lid 21 are supported by support members 22 between them and the holder 6a. The support members 22 have sufficient rigidity and strength to resist deformation and breakage even when subjected to load F2. Therefore, even when load F2 acts on the load surface S, both ends of the lid 21 are held in place.

In the embodiment shown in Figure 3A, the lid body 21 has a first lid piece 21a and a second lid piece 21b. When a load F2 acts on the center of the lid body 21, the lid body 21 bends so that the inner ends of each lid piece 21a, 21b move downward while the outer ends of each lid piece 21a, 21b remain in place.

As shown in Figure 3A, the inner ends 21c of the first lid piece 21a and the second lid piece 21b are thinner than the outer ends 21d. In Figure 3A, there is a slight gap between the inner ends 21c of the first lid piece 21a and the second lid piece 21b, but the inner ends 21c of the first lid piece 21a and the second lid piece 21b may be in contact. Also, the first lid piece 21a and the second lid piece 21b may be integrated.

As shown in FIG. 3A, the electrolyte pack 9 is contained within the lid 21. The electrolyte pack 9 is positioned so as to straddle the lid pieces 21a and 21b. As shown in FIG. 3A, when a load F2 acts between the lid pieces 21a and 21b, the lid pieces 21a and 21b move downward around the outer end 21d fixed to the support member 22 as a fulcrum. When viewed from the perspective of the lid 21 as a whole, the center of the lid 21 is bent downward. Due to this bending movement of the lid 21, as shown in FIG. 3B, the electrolyte pack 9 supported by the lid 21 is pulled to both sides at the bottom of its container 8, causing it to break, and the electrolyte 7 to leak from inside the container 8. The leaked electrolyte 7 then permeates the separator 4 between the metal electrode 2 and the air electrode 3, starting power generation.

3A, the electrolyte pack 9 is contained within the lid 21, but the arrangement of the electrolyte pack 9 is not limited as long as the electrolyte pack 9 is destroyed when the lid 21 is bent. For example, the electrolyte pack 9 may be arranged on the underside of the lid 21. Furthermore, the lid 21 itself may be the electrolyte pack 9. For example, the integrated lid pieces 21a and 21b each serve as a container, and each container contains the electrolyte 7. When the lid 21 is bent under the load F2, the connection between the lid pieces 21a and 21b breaks, causing the electrolyte 7 to leak out.
The load sensor 20 of the third embodiment is suitably used in applications where the load F2 acts mainly near the center of the lid 21.

In the load sensor 20 of the third embodiment, the load surface S is configured to be bendable. When the load surface S bends under load F2, the electrolyte pack 9 breaks, and the electrolyte 7 is supplied between the metal electrode 2 and the air electrode 3, generating electricity.

<Description of Load Sensor 30 in Fourth Embodiment>
Fig. 4A is a cross-sectional view of the load sensor 30 according to the fourth embodiment, and Fig. 4B is a cross-sectional view showing the state of the load sensor 30 of Fig. 4A after it has received a load. In the load sensor 30, the same components as those in the load sensor 10 shown in Fig. 1A are denoted by the same reference numerals.

In the load sensor 30 shown in Figure 4A, the lid body 31 is divided into a first lid piece 31a and a second lid piece 31b. As shown in Figure 4A, the outer end 31d of each lid piece 31a, 31b is supported between the holder 6a and the lid piece 31a and the holder 6a via a support member 32.

The support member 32 is made of a material with lower rigidity or strength than the lid body 31, and when the support member 32 receives the load F3 shown in FIG. 4A, it deforms or breaks in the direction in which the load F3 acts, as shown in FIG. 4B. Alternatively, the lid body 31 may be supported so that it can slide in the direction in which the load F3 is received.

As shown in Figure 4A, the electrolyte pack 9 is contained within the lid body 31. The electrolyte pack 9 is positioned across the first lid piece 31a and the second lid piece 31b.

As shown in Figure 4A, when load surface S receives load F3 and both sides of lid body 31 are pulled, support member 32 deforms or breaks, or the pair of lid pieces 31a, 31b slide along the surface of support member 32, moving away from each other. This causes a tensile load F3 to act on electrolyte pack 9 from load surface S, which breaks the electrolyte pack 9 and causes electrolyte 7 to leak, as shown in Figure 4B. "Tensile load" refers to a force acting in a direction that stretches the electrolyte pack 9 when load F3 acts on the electrolyte pack 9. The leaked electrolyte 7 then permeates the separator 4 between the metal electrode 2 and the air electrode 3, starting power generation.

The lid body 31 shown in FIG. 4A may be an integrated unit, rather than being divided into the first lid piece 31a and the second lid piece 31b. In this case, for example, the inner end 31c of the first lid piece 31a and the inner end 31c of the second lid piece 31b may be formed with a thickness thinner than the outer end 1d. When the inner ends 31c of the lid pieces 31a, 31b are pulled apart by the tensile load F3, the container 8 of the electrolyte pack 9 is destroyed and the electrolyte 7 leaks.

Alternatively, the lid body 31 may be the electrolyte pack itself, and the connection between the first lid piece 31a and the second lid piece 31b may be broken by the tensile load F3, causing the electrolyte 7 to leak.
4A, the electrolyte pack 9 may not be enclosed in the lid 31, but may be disposed on the underside of the lid 31.

In this way, in the load sensor 30 of the fourth embodiment, when the electrolyte pack 9 receives a tensile load F3 from the load surface S, the electrolyte pack 9 breaks, causing the electrolyte 7 to be supplied between the metal electrode 2 and the air electrode 3, generating electricity.

<Description of Load Sensor 40 in Fifth Embodiment>
Fig. 5A is a cross-sectional view of a load sensor 40 according to a fifth embodiment, and Fig. 5B is a cross-sectional view showing the state of the load sensor 40 of Fig. 5A after it has received a load. In the load sensor 40, the same components as those in the load sensor 10 shown in Fig. 1A are denoted by the same reference numerals.

5A is provided with a metal-air battery 5, which is formed by stacking a metal electrode 2, a separator 4, and an air electrode 3 in this order from the bottom, and is placed in a housing 41. As shown in FIG. 5A, the surface of the air electrode 3 is exposed to the outside, and the surface of the air electrode 3 serves as a load surface S.
As shown in FIG. 5A, an electrolyte pack 9 is disposed between the metal-air battery 5 and a housing 41.

5A, when a load F1 acts on the load surface S, the load F1 acts as a compressive load F1 on the electrolyte pack 9. This causes the electrolyte pack 9 to break, causing the electrolyte 7 to leak and be supplied to the separator 4 between the metal electrode 2 and the air electrode 3, generating electricity.
In FIG. 5A, the surface of the air electrode 3 is the load surface S, but the surface of the metal electrode 2 may be configured to be the load surface S.

<Effects of this embodiment>
In the load sensors of the above-described embodiments, when the electrolyte pack 9 receives a load from the load surface S, the electrolyte 7 leaks out and is supplied between the metal electrode 2 and the air electrode 3, generating electricity. As described above, in the present embodiment, the electrolyte pack 9 can be configured with a simple structure in which the electrolyte 7 leaks out when the electrolyte pack 9 receives a load from the load surface S, and a small, thin self-powered sensor can be realized.
As long as the load causes the electrolyte pack 9 to be broken or the like, causing the electrolyte 7 to leak, the load acting on the electrolyte pack 9 may be either a compressive load or a tensile load.

The load surface S may be the surface of the metal electrode 2, the surface of the air electrode 3, or the surface of a member other than the metal-air battery 5. Using the surface of the metal electrode 2 or the surface of the air electrode 3 as the load surface S allows the load sensor to be made thinner more effectively. On the other hand, an example of a form in which the surface of a member other than the metal-air battery 5 is used as the load surface S is the surface of the casing that houses the metal-air battery 5. Using the surface of the casing as the load surface S allows the metal-air battery 5 to be appropriately protected from the outside and enables the measurement load range to be accurately determined. Furthermore, in a configuration in which the surface of the casing is used as the load surface S, the electrolyte pack 9 can be positioned between the casing and the metal-air battery 5, allowing the electrolyte pack 9 to be appropriately held and a compressive or tensile load to be appropriately applied to the electrolyte pack 9.

<About load sensor applications>
The load sensor according to the present embodiment can be applied to various applications. For example, it can be used to detect the movement of an object. Specifically, it can be used as a security sensor that detects the opening and closing of a door, a sensor for capturing living creatures, a sensor for detecting geological changes such as faults and landslides, and avalanches.
When the object moves, a load acts on the electrolyte 7, causing the electrolyte pack 9 to leak, and power generation begins.

Alternatively, the sensor can be used to detect changes in an object, such as detecting the crash position of an object such as a drone, or detecting changes over time such as cracks or misalignment in a structure.
A load is applied due to a change caused by deformation or destruction of the object, causing the electrolyte 7 to leak from the electrolyte pack 9, and power generation begins.

Alternatively, the present invention can be applied to applications for detecting the presence or absence of an object, specifically to security sensors such as an intrusion sensor and a theft sensor.
For example, when an object is placed on the load surface S or when an object that was on the load surface S is removed, a load acts, causing the electrolyte 7 to leak from the electrolyte pack 9, and power generation begins.

Alternatively, the sensor can be used to detect the pressing of a switch, such as a beacon or emergency button in case of distress in the mountains or at sea.
When the switch is pressed, a load is applied, causing the electrolyte 7 to leak from the electrolyte pack 9, and power generation begins.

In the above applications, the notification to the person can be done by wire, wirelessly, sound, light, etc. The load sensor of each embodiment shown in Figures 1 to 5 can be selected appropriately depending on the direction and magnitude of the load.

The load sensor of the present invention can be effectively used as a sensor for detecting the movement of an object, etc. In particular, the present invention allows for the realization of a load sensor with a small and simple structure, and the load sensor does not require an external power source. Therefore, it is highly user-friendly and can be used easily regardless of the object or location.

1, 10, 20, 30, 40: Load sensor 2: Metal electrode 3: Air electrode 4: Separator 4a: Protrusion 5: Metal-air battery 6, 41: Housing 6a: Holder 6b, 21: Lid 6c, 22, 32: Support member 7: Electrolyte 8: Container 9: Electrolyte pack 21, 31: Lid 21c, 31c: Inner end 21d, 31d: Outer end 51: Transmitter 52: Receivers F1 to F3: Compressive load S: Load surface

Claims (6)

A metal-air battery having a metal electrode and an air electrode, an electrolyte pack containing an electrolyte, and a load surface for receiving a load,
a compressive load acts on the electrolyte pack from the load surface, causing the electrolyte to leak from the electrolyte pack, and the electrolyte is supplied to the metal-air battery to generate electricity;
a support member is provided that supports the load surface and allows the load surface to move in a direction in which the compressive load acts, and the electrolyte pack is disposed inside the support member;
A load sensor characterized by: A metal-air battery having a metal electrode and an air electrode, an electrolyte pack containing an electrolyte, and a load surface for receiving a load,
When the electrolyte pack receives the load from the load surface, the electrolyte is supplied from the electrolyte pack to the metal-air battery to generate electricity ,
The load sensor is characterized in that the load surface is bendable, and when the load is received, the load surface bends, causing the electrolyte to leak from the electrolyte pack . A metal-air battery having a metal electrode and an air electrode, an electrolyte pack containing an electrolyte, and a load surface for receiving a load,
When the electrolyte pack receives the load from the load surface, the electrolyte is supplied from the electrolyte pack to the metal-air battery to generate electricity ,
A load sensor characterized in that the load surface is formed by a surface of the metal electrode, a surface of the air electrode, or a surface of a member other than the metal-air battery . A metal-air battery having a metal electrode and an air electrode, an electrolyte pack containing an electrolyte, and a load surface for receiving a load,
When the electrolyte pack receives the load from the load surface, the electrolyte is supplied from the electrolyte pack to the metal-air battery to generate electricity ,
A load sensor comprising a housing that houses the metal-air battery and the electrolyte pack, the housing having a load surface, and the electrolyte pack being disposed between the housing and the metal-air battery . 4. The load sensor according to claim 3, wherein a tensile load acts on the electrolyte pack from the load surface, causing the electrolyte to leak from the electrolyte pack. 5. The load sensor according to claim 3, wherein a compressive load acts on the electrolyte pack from the load surface, causing the electrolyte to leak from the electrolyte pack.