JP7669694B2 - Electronic device and method for manufacturing electronic device - Google Patents

Description

The present invention relates to electronic devices and methods for manufacturing electronic devices.

In recent years, it has become common to wear electronic devices on the body to obtain biometric and location information. One method for wearing electronic devices is to incorporate them into clothing or shoes. This method requires that it does not interfere with the user's movements or cause discomfort when worn. In order to meet this demand, it is effective to make electronic devices smaller, especially thinner.

For example, Patent Document 1 discloses a technique for storing electronic components and a button battery inside a case, aligned in the width direction of the button battery. With this technique, lining up the electronic components and the button battery in the width direction of the button battery makes the electronic device thinner. Patent Document 1 also discloses a technique for storing the electronic device in a recess in the sole of the inside of the shoe, reducing discomfort when wearing the shoe.

JP 2020-058691 A

However, the technology in Patent Document 1 had the problem that the thickness of the case was greater than the button battery and electronic components housed inside.

The present invention was made in consideration of the above problems, and aims to provide an electronic device that uses a button battery that can be made thin.

In order to solve the above problems, the electronic device of the present invention has a button battery, a housing, a fixing means, and an electric circuit. The housing has a first main surface and a second main surface located on the opposite side of the first main surface. The first main surface is provided with a first opening through which the entire one main surface of the button battery is exposed, and the second main surface is provided with a second opening through which the entire other main surface of the button battery is exposed. The thickness of the housing, defined as the distance between the first main surface and the second main surface, is set to be equal to or less than the thickness of the button battery, or greater than the thickness of the button battery and within a range in which the housing is not broken when the housing is deformed in the thickness direction to the thickness of the button battery. The fixing means is located between the first main surface and the second main surface of the housing and fixes the button battery to the housing. The electric circuit is disposed inside the housing and is connected to the button battery.

The manufacturing method of the electronic device of the present invention includes fixing a button battery to a housing having a first main surface and a second main surface located opposite to the first main surface, the first main surface being provided with a first opening exposing one of the entire main surfaces of the button battery, and the second main surface being provided with a second opening exposing the other of the entire main surfaces of the button battery, with a fixing means located between the first main surface and the second main surface, and connecting an electric circuit arranged within the housing to the button battery. The thickness of the housing, defined as the distance between the first main surface and the second main surface, is equal to or less than the thickness of the button battery, or the thickness of the housing is greater than the thickness of the button battery, and the difference between the thickness of the housing and the thickness of the button battery is within a range of deformation that does not destroy the housing when the housing is crushed to the thickness of the button battery.

The advantage of the present invention is that it is possible to provide electronic devices that use button batteries that can be made thin.

1 is a schematic cross-sectional view illustrating an electronic device according to a first embodiment. FIG. 13 is a schematic cross-sectional view illustrating a configuration example of an electronic device according to a second embodiment. FIG. 11 is a schematic cross-sectional view illustrating another configuration example of the electronic device according to the second embodiment. FIG. 13 is a perspective view illustrating an example of an electronic device according to a third embodiment. FIG. 11 is a perspective cross-sectional view illustrating an example of an electronic device according to a third embodiment. FIG. 11 is a cross-sectional view illustrating an example of an electronic device according to a third embodiment. FIG. 13 is a perspective view illustrating an example of an electronic device according to a fourth embodiment. FIG. 13 is a perspective cross-sectional view illustrating an example of an electronic device according to a fourth embodiment. FIG. 13 is an exploded view illustrating an example of an electronic device according to a fourth embodiment. FIG. 13 is a cross-sectional view illustrating an example of an electronic device according to a fourth embodiment. FIG. 13 is a cross-sectional view showing a modified example of the electronic device of the fourth embodiment. FIG. 13 is a perspective view illustrating an example of an electronic device according to a fifth embodiment. FIG. 13 is a cross-sectional view illustrating an example of an electronic device according to a fifth embodiment. FIG. 13 is a cross-sectional view showing a modified example of the electronic device of the fifth embodiment. FIG. 13 is a cross-sectional view illustrating another example of the electronic device according to the fifth embodiment. FIG. 13 is a perspective view illustrating an example of an electronic device according to a sixth embodiment. FIG. 23 is a perspective view illustrating another example of the electronic device according to the sixth embodiment. FIG. 13 is a cross-sectional view illustrating an example of an electronic device according to a seventh embodiment. FIG. 13 is a perspective view showing an insole-type electronic device according to an eighth embodiment.

Below, an embodiment of the present invention will be described in detail with reference to the drawings. However, the embodiment described below has limitations that are technically preferable for implementing the present invention, but does not limit the scope of the invention to the following. Note that similar components in each drawing are given the same numbers, and descriptions may be omitted.

(First embodiment)
FIG. 1 is a cross-sectional view showing an electronic device 10 of this embodiment. The electronic device 10 has a button battery 1, a housing 2, a fixing means 3, and an electric circuit 4. The housing 2 has a first main surface 2a and a second main surface 2b located on the opposite side to the first main surface. The first main surface 2a is provided with a first opening 2c through which one main surface 1a of the button battery 1 is entirely exposed, and the second main surface 2b is provided with a second opening 2d through which the other main surface 1b of the button battery 1 is entirely exposed. The thickness of the housing 2, defined by the distance between the first main surface 2a and the second main surface 2b, is set to be equal to or less than the thickness of the button battery 1, or within a range in which the housing 2 is not broken when the housing 2 is deformed in the thickness direction to the thickness of the button battery 1.

The fixing means 3 is located between the first main surface 2a and the second main surface 2b of the housing 2 and fixes the button battery 1 to the housing 2.

The electrical circuit 4 is disposed inside the housing 2 and is electrically connected to the button battery 1, although this is not shown.

As explained above, in this embodiment, there is no housing in the thickness direction of the button battery, and the thickness of the housing is equal to or less than the thickness of the button battery, or is within a range in which the housing 2 will not be destroyed if it is deformed in the thickness direction to the thickness of the button battery. This makes it possible to make the electronic device thinner than the method of Patent Document 1.

Second Embodiment
A typical button battery is made of a strong material such as stainless steel that is difficult to deform, and has a button shape, so that it has strong mechanical strength. The configuration of the first embodiment utilizes the robustness of this button battery. For example, when an electronic device is attached to the insole of a shoe, the electronic device is subjected to a force from the wearer's foot in a direction that crushes the electronic device. At this time, if the electronic device is mounted in the insole in the arrangement shown in FIG. 1, the robust button battery provides support in the thickness direction, so that the electronic device placed inside the housing can be protected. The button battery referred to here also includes a battery in a shape called a coin type.

In the configuration of the first embodiment, various variations are possible regarding the positional relationship in the thickness direction between the housing 2 and the button battery 1. Examples are shown in Figures 2 and 3. Figure 2 shows an example configuration in which the thickness of the button battery 1 is thicker than the thickness of the housing 2, and Figure 3 shows an example configuration in which the button battery 1 is thinner than the housing 2.

2(a) is a schematic cross-sectional view showing a configuration in which the other surface 1b of the button battery 1 is fixed flush with the second main surface 2b of the housing 2, and one surface 1a of the button battery protrudes from the first main surface 2a of the housing 2. In this configuration, when a force is applied over a range wider than the top surface of the electronic device 10, such as stepping on it with a foot, the force is supported by the button battery 1. Therefore, the force applied to the housing 2 can be reduced. Also, FIG. 2(b) is a schematic cross-sectional view showing a configuration in which one surface 1a of the button battery 1 protrudes from the second main surface 2a of the housing 2, and the other surface 1b also protrudes from the second main surface 2b. In this configuration, as in the case of FIG. 2(a), the button battery 1 supports the force in the direction of crushing from above, so the force applied to the housing 2 can be reduced. Note that the material of the housing 2 can be, for example, plastic or rubber, which is an insulator. It is also possible to use ceramic, although it is expensive.

3 is a schematic cross-sectional view showing an example of a configuration in which the button battery 1 is thinner than the housing 2. In the example of FIG. 3(a), the other surface 1b of the button battery 1 is fixed flush with the second main surface 2b of the housing 2, and one surface 1a of the button battery 1 is recessed from the first main surface 2a of the housing 2. In this configuration, when a force such as stepping on it is applied, the housing 2 receives the force first. The housing 2, which is made of a tough material such as plastic or rubber, deforms, but when the deformation reaches the thickness of the button battery, the deformation stops there. Therefore, if the difference between the thickness of the housing 2 and the thickness of the button battery is within a range in which the housing 2 is not destroyed when a crushing force is applied in the thickness direction, it can return to its original shape when the force disappears. In addition, in the case of such a configuration, it is recommended to place electronic components 4 inside the housing 2 so that the electric circuit 4 and the housing 2 do not interfere with each other even if the housing 2 deforms to the thickness of the button battery 1. Here, interference means that the housing 2 and the electronic component 4 come into contact with each other, causing the electronic component 4 to malfunction. Even if there is physical contact, there is no problem as long as it does not affect the operation of the electronic circuit 4.

3(b) shows a configuration in which one surface 1a of the button battery 1 is recessed from the first main surface 2a of the housing 2, and the other surface 1b of the button battery 1 is recessed from the second main surface 2b of the housing 2. In this configuration, when a force such as stepping on the battery is applied, the housing 2 receives the force first. The housing 2 then deforms, but when the deformation reaches the thickness of the button battery, the deformation stops there. Therefore, as in the configuration of FIG. 3(a), if the difference between the thickness of the housing 2 and the thickness of the button battery is within a range in which the housing 2 is not destroyed when a crushing force is applied in the thickness direction, the housing 2 can return to its original shape when the force is removed. As in the case of FIG. 3(a), it is preferable to place the electronic components 4 inside the housing 2 so that the electric circuit 4 and the housing 2 do not interfere with each other even if the housing 2 deforms to the thickness of the button battery 1. The range in which the housing 2 is not destroyed varies depending on the material, but from the viewpoint of making the electronic device 10 thinner, it is preferable that the difference between the thickness of the housing 2 and the thickness of the button battery 1 is small.

Note that while Figures 2 and 3 show an example in which the fixing means 3 is located between the electric circuit 4 and the button battery 1, the fixing means 3 does not have to be connected to the electric circuit 4. For example, the fixing means 3 may be a member that fixes the button battery 1 to the housing 2, independent of the electric circuit 4. The fixing means 3 may also be composed of a combination of multiple members.

As described above, according to this embodiment, when a force is applied in the thickness direction of the housing, it is possible to reduce the thickness of the electronic device while suppressing damage to the housing.

Third Embodiment
In this embodiment, a specific configuration of the electronic device described in the first and second embodiments will be described. Fig. 4 is a perspective view showing an electronic device 1000 of this embodiment. Fig. 5 is a perspective cross-sectional view taken along line A-A' in Fig. 4, and Fig. 6 is a cross-sectional view taken along line A-A' in Fig. 4. As shown in Fig. 4, the housing 200 has an upper housing 210 and a lower housing 220, and the upper housing 210 is provided with a first opening 211 that exposes the entire flat surface of the positive electrode 110 of the button battery 100.

As shown in FIG. 5, a positive electrode terminal 111 is connected to the side of the positive electrode 110 of the button battery 100, and a negative electrode terminal 121 is connected to the side of the negative electrode 120. The positive electrode terminal 111 and the negative electrode terminal 121 are each connected to an electric circuit 400.

As shown in FIG. 6, the positive electrode terminal 111 is welded, for example, to a side portion of the positive electrode 110. The negative electrode terminal 121 is welded, for example, to a side portion of the negative electrode 120. The positive electrode terminal 111 and the negative electrode terminal 121 are each soldered to electrodes of the electric circuit 400 and supply power to the electric circuit 400. With this configuration, the positive electrode terminal 111 and the negative electrode terminal 121 also serve as a fixing means for fixing the button battery 100 to the housing 200.

The electrical circuit 400 is equipped with various sensors that measure, for example, temperature, humidity, pressure, acceleration, and geomagnetism, and the measured data can be transmitted to a smartphone or the like by incorporating a communication function such as a Bluetooth (registered trademark) module.

The upper housing 210 and the lower housing 220 are pot-shaped, and the electrical circuit 400 is stored in the space formed by fitting the edges of the pots together facing each other.

The edges of the upper housing 210 and the lower housing 220 are provided with uneven portions 212 and 222, respectively, so that the uneven portions 212 and 222 fit together. An adhesive (not shown) is applied between the uneven portions 212 and 222, and the upper housing 210 and the lower housing 220 are bonded together so that no gaps are created between them when they are fitted together. For example, a silicone-based sealant is used as the adhesive, and it can be applied, for example, with an air pulse dispenser.

The upper housing 210 and the lower housing 220 are pot-shaped. At the bottom of the upper housing 210, a first opening 211 is formed, through which the entire flat surface of the positive electrode 110 of the button battery 100 is exposed. At the bottom of the lower housing 220, a second opening 221 is formed, through which the entire flat surface of the negative electrode 120 is exposed. The thickness of the housing 200, which is the assembly of the upper housing 210 and the lower housing 220, can be made the same as the thickness of the button battery 100, for example. The main surface of the upper housing 210 and the flat surface of the positive electrode 110 of the button battery 100 can be made flush with each other, and the main surface of the lower housing 220 and the flat surface of the negative electrode 120 of the button battery 100 can be made flush with each other.

With the above configuration, it is possible to design electronic devices so that their thickness is as thin as that of a button battery. In addition, by utilizing the mechanical strength of the button battery, mechanical strength in the thickness direction can be ensured.

(Fourth embodiment)
In this embodiment, an electronic device having a terminal connected to a flat surface of a positive electrode or a flat surface of a negative electrode of a button battery will be described.

Figure 7 is a perspective view showing electronic device 1000a of this embodiment, Figure 8 is a perspective cross-sectional view taken along line B-B' in Figure 7, Figure 9 is an exploded view, and Figure 10 is a cross-sectional view taken along line B-B'. Electronic device 1000a has a button battery 100a, an electric circuit 400a, and a housing 200a. Housing 200a has a first opening 211a that exposes the entire flat surface of positive electrode 110a of button battery 100a, and a second opening 221a that exposes the entire flat surface of negative electrode 120a.

Figure 10 is a cross-sectional view taken along the line B-B' in Figure 7. In the button battery 100a, a positive electrode terminal 111a is connected to the main surface of the positive electrode 110a, and a negative electrode terminal 121a is connected to the main surface of the negative electrode 120a. The positive electrode terminal 111a and the negative electrode terminal 121a can be connected by, for example, welding. The positive electrode terminal 111a is connected to the main surface of the positive electrode 110a, one end of which is extended to pass near the side portion of the positive electrode 110a, and its end is connected to the electrode 410a of the electric circuit 400a. The negative electrode terminal 121a is connected to the main surface of the negative electrode 120a, one end of which is extended to pass near the side portion of the negative electrode 120a, and its end is connected to the electrode 410a of the electric circuit 400a. With the above configuration, the mechanical strength of the connection between the positive electrode terminal 111a, the negative electrode terminal 121a, and the button battery 100a can be strengthened, and the battery can be firmly fixed to the housing 200a via the electric circuit 400a. In the example of FIG. 10, the upper surface of the positive electrode terminal 111a arranged on the main surface of the positive electrode 110a is flush with the main surface of the upper housing 210a, and the upper surface of the negative electrode terminal 121a arranged on the main surface of the negative electrode 120a is flush with the main surface of the lower housing 210a.

The upper housing 210a has an uneven portion 212a on its edge, and the lower housing 220a has an uneven portion 222a on its edge. The two are fitted together and bonded together with an adhesive (not shown) so that no gaps are created.

There are various types of button battery 100a, but for example, an alkaline battery such as LR44 or a lithium primary battery such as CR2032 can be used. In addition, a lithium ion secondary battery such as CP1654 (Varta Microbattery Corp.) or a nickel-hydrogen secondary battery such as V150HT (Varta Microbattery Corp.) can also be used. If a secondary battery is used, the electronic module can be used by repeatedly charging it. For example, when using a lithium ion secondary battery, a protection circuit and a charging circuit can be implemented in the electrical circuit 400a, and a charging terminal can be provided on the surface of the housing 200a (not shown).

Figure 11 is a cross-sectional view showing a modified example of the configuration of Figure 10. In the example of Figure 11, the thickness of the button battery 100a is greater than the thickness of the housing 200a. With this configuration, when a force is applied in the thickness direction, the button battery 100a acts as a support, making it easier to protect the housing 200a and the electric circuit 400a held therein.

As described above, in this embodiment, the positive electrode terminal is joined to the flat surface of the positive pole, and the negative electrode terminal is joined to the flat surface of the negative pole. This makes it easier to form a strong joint compared to the configuration of the third embodiment in which the positive electrode terminal and the negative electrode terminal are joined to the cylindrical side surface of the button battery.

Fifth Embodiment
In this embodiment, a configuration for preventing water from entering the housing will be described. FIG. 12 is a perspective view showing an electronic device 1000b of this embodiment. FIG. 13 is a cross-sectional view taken along line CC' in FIG. 12. In the configurations of FIGS. 12 and 13, a waterproof sealant 500a is filled in the gap between the button battery 100a and the upper housing 210a, and in the gap between the button battery 100a and the lower housing 220a. This makes it possible to prevent water and dust from entering the housing. The other configurations are the same as those of the examples of FIGS. 7 to 10 of the fourth embodiment.

If the gap between the button battery 100a and the upper housing 210a is wide, the liquid waterproof sealant 500a will easily flow downward when filled. For this reason, it is desirable that the gap not be wide, and for example, it can be 1 mm or less. Furthermore, it is even more desirable that it be 0.2 mm or less.

In addition to the configuration of FIG. 13, FIG. 14 adds a waterproof sealant to the gaps, and affixes a waterproof sheet 510a that continuously covers the front and back surfaces of the button battery 100a and the housing 200a, and the waterproof sealant 500a. The waterproof sheet 510a covers the seams between the button battery 100a and the waterproof sealant 500a, and the seams between the housing 200a and the waterproof sealant 500a, thereby improving waterproofing. In addition, it is possible to prevent short circuits between electrodes that should be insulated, and corrosion of the electrodes, in each electrode of the button battery 100a and each electrode of the electric circuit 400.

Figure 15 shows an example in which a waterproof coating 520a is applied instead of the waterproof sheet 510a, which is the waterproof layer in Figure 14. The waterproof coating 520a covers the seam between the button battery 100a and the waterproof sealant 500a and the seam between the housing 200a and the waterproof sealant 500a, thereby improving waterproofing. Note that in this configuration, it is also possible to configure the waterproof coating 520a to fit into the gap between the button battery 100a and the housing 200a. In this case, the same effect can be achieved even without the waterproof sealant 500a.

As described above, the configuration of this embodiment can prevent water and dust from entering the housing. It can also prevent short circuits between electrodes and corrosion of the electrodes.

Sixth Embodiment
As explained in the second embodiment, if the thickness of the button battery is smaller than the thickness of the case, the force applied to the case will be large when a force is applied in the thickness direction, such as by stepping on it from above. In this embodiment, a method for reducing this force will be explained.

Figure 16 is a perspective view showing electronic device 1000c of this embodiment. Except for the fact that the thickness of button battery 100c is smaller than the thickness of housing 200c, the configuration of button battery 100c and housing 200c is the same as that of Figure 4 of the third embodiment. On the other hand, in the configuration of Figure 16, a spacer 530c is provided to fill the step between the main surface of housing 200c and the main surface of button battery 100c. In this configuration, when a force is applied to electronic device 1000c in the thickness direction, such as when stepped on from above, and housing 200c deforms in a direction that causes it to be crushed, the timing at which force begins to be applied to button battery 100c is accelerated, making it easier to protect housing 200c.

Figure 17 is a perspective view showing an electronic device 1000d that is a modified example of Figure 16. In the example of Figure 17, the button battery 100d has a positive electrode terminal 111d connected to the main surface of the button battery 100d, similar to the fourth embodiment. The spacer 530d is shaped to avoid the positive electrode terminal 111d, so that the top surface of the positive electrode terminal 111d, the top surface of the spacer 530d, and the top surface of the housing 200d are flush with each other.

Spacers 530c and 530d can be made by cutting a resin film such as PET (polyethylene terephthalate) into the desired shape. Although not shown, the surface of the lower housing can also be made flush using spacers.

By using the above configuration, when external pressure is applied to the electronic device in the thickness direction, the pressure is distributed evenly to both the housing and the battery, preventing damage caused by localized concentration of force.

Seventh Embodiment
In this embodiment, a configuration in which the connection between the button battery and the electric circuit is not easily broken is described. FIG. 18 is a cross-sectional view showing an electronic device 1000e of this embodiment. In the configuration of FIG. 18, the positive electrode terminal 111e has a redundant portion 111r between the button battery connection portion and the electric circuit connection portion. Similarly, the negative electrode terminal 121e has a redundant portion 121r between the button battery connection portion and the electric circuit connection portion. The redundant portions 111r and 121r have elasticity like a leaf spring, and the bent portion can expand and contract. Therefore, when an external force that displaces the positional relationship between the button battery 100e and the housing 200e is applied, it is possible to make it difficult for a break to occur at the joint between the positive electrode terminal 111e and the positive electrode 110e. Similarly, it is possible to make it difficult for a break to occur at the joint between the positive electrode terminal 111e and the electric circuit 400e. In addition, it is possible to make it difficult for breaks to occur at the joint between the negative electrode terminal 121e and the negative electrode 120e and at the joint between the negative electrode terminal 121e and the electric circuit 400e. The redundant portion may be configured in a coil spring shape, or a bent lead wire may be interposed (not shown).

Eighth embodiment
The electronic devices according to the first to seventh embodiments can be used, for example, as insole-type electronic devices in which an electronic device is placed in an insole. Since an insole-type electronic device is placed in a shoe, it is preferable that the electronic device is thin. In addition, since the electronic device receives a load from the sole of the wearer's foot toward the sole, it is also required to have mechanical strength. For this reason, the electronic devices according to the first to seventh embodiments are suitable for insole-type electronic devices.

Figure 19 is a perspective view showing an insole type electronic device 2000 in which the electronic device 1000a of the fourth embodiment is mounted. In the insole type electronic device 2000, the electronic device 1000a is placed under the arch of the insole 2100. In order to prevent the wearer from feeling uncomfortable, for example, a desired portion (here, under the arch) of a commonly sold insole 2100 may be dug out and the electronic device 1000 may be fitted into the insole. Insole with a storage portion formed from the beginning may also be manufactured. Since the electronic device 1000a is thin, it is unlikely to cause discomfort in the sole of the foot even when stepped on. Furthermore, even if weight is applied, the high-strength button battery is integrated with the housing and can withstand external pressure, so that a thin yet highly reliable insole type electronic device 2000 can be provided.

Electronic devices using button batteries can also be used in wearable devices other than insole-type electronic devices. For example, in devices that are in close contact with the body, the discomfort can be reduced by wrapping the electronic module in a flexible material. In such a usage form, the less unevenness and angularity of the electronic device, the smaller and thinner it is, the less discomfort it feels. Here, if the electronic device of the first to seventh embodiments is used, the electronic device can withstand external pressure because the high-strength button battery is integrated with the housing. Therefore, a wearable device can be configured that is thin yet has high mechanical strength. Note that the above-mentioned flexible material can be, for example, a rubber material such as a urethane-based, ethylene-based, or silicone-based rubber material, or a sponge material made by foaming these.

The present invention has been described above using the above-mentioned embodiment as an exemplary example. However, the present invention is not limited to the above-mentioned embodiment. In other words, the present invention can be applied in various aspects that can be understood by a person skilled in the art within the scope of the present invention.

1, 100 Button battery 2, 200 Housing 3 Fixing means 4, 400 Electric circuit 10, 1000 Electronic device

Claims (8)

A button battery;
a housing having a first main surface and a second main surface located opposite to the first main surface, the first main surface being provided with a first opening through which one of the main surfaces of the button battery is entirely exposed, and the second main surface being provided with a second opening through which the other of the main surfaces of the button battery is entirely exposed;
a fixing means located between the first main surface and the second main surface, for fixing the button battery to the housing;
an electrical circuit disposed within the housing and connected to the button cell battery;
having
The thickness of the housing, defined by the distance between the first main surface and the second main surface, is equal to or less than the thickness of the button battery.
1. An electronic device comprising: 2 . The electronic device according to claim 1 , further comprising a sealant that fills a gap between an inner edge of the first opening and the button battery, and a gap between an inner edge of the second opening and the button battery. The electronic device described in claim 1 or 2, characterized in that it has a waterproof layer that continuously covers the gap between the inner edge of the first opening and the button battery and one of the main surfaces of the button battery, and that continuously covers the gap between the inner edge of the second opening and the button battery and the other main surface of the button battery. 4. The electronic device according to claim 1, wherein a gap between an inner edge of the first opening and the button battery and a gap between an inner edge of the second opening and the button battery are 1 mm or less. The housing,
5. The electronic device according to claim 1 , wherein the electronic device is made of rubber, plastic, or both. The fixing means is
The electronic device according to claim 1 , further comprising a wiring electrically connected to at least one of the electrodes of the button battery. a button battery is fixed to a housing having a first main surface and a second main surface opposite to the first main surface, the first main surface being provided with a first opening through which one of the main surfaces of the button battery is entirely exposed, and the second main surface being provided with a second opening through which the other of the main surfaces of the button battery is entirely exposed, by a fixing means located between the first main surface and the second main surface;
connecting an electric circuit disposed within the housing to the button cell battery;
The thickness of the housing, defined by the distance between the first main surface and the second main surface, is equal to or less than the thickness of the button battery.
2. A method for manufacturing an electronic device comprising the steps of : 8. The method for manufacturing an electronic device according to claim 7 , further comprising filling at least one of a gap between an inner edge of the first opening and the button battery and a gap between an inner edge of the second opening and the button battery with a sealant.

Images