JP2002170538A - Battery and electronic equipment - Google Patents

Abstract

(57) Abstract: A battery element and a battery having a curved shape are firmly fixed to a curved internal space of an exterior material. SOLUTION: A battery element 2 having a curved shape, and a battery case 4 having an internal space 3 curved to a curvature different from the curvature of the battery element 2 are provided, and the battery element 2 is elastically deformed. It is stored in the internal space 3 of the battery case 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery having a curved shape, and an electronic apparatus equipped with the battery having such a curved shape.

[0002]

2. Description of the Related Art In recent years, for example, a camera-integrated VTR (vide
o tape recorder), mobile phones, portable computers, etc.
While miniaturization has been achieved, improvements have been made in batteries as power sources for these portable electronic devices.

[0003]

However, since the battery is generally in the shape of a rectangular parallelepiped or a cylinder, it is difficult to mount the battery in the curved space of the electronic device described above, and the curved space inside the electronic device is difficult. Is wasted space.

Therefore, if a battery can be mounted in such a curved space, the size of the electronic device can be reduced. Furthermore, if the housing of the electronic device is used as the exterior material of the battery, the size of the electronic device can be further reduced.

When a battery is bent in order to mount the battery in such a curved space, a battery element 100 having a curved shape as shown in FIG. A battery case 102 having an internal space 101 for performing the operation is required. FIG. 7 is a schematic cross-sectional view schematically showing the internal structure of a battery having a curved shape. Here, the battery case 102 needs to have sufficient strength, and the battery element 100 needs to be firmly fixed to the internal space 101 so that the battery element 100 is not damaged by vibration, impact, or the like. However, in the battery having such a curved shape, it is very difficult to securely fix the battery element 100 in the internal space 101 of the battery case 102 so as not to be damaged by an external impact or the like.

For example, as a method of fixing the battery element in the internal space of the battery exterior material, it is conceivable to fix the battery element in the internal space of the battery exterior material using a leaf spring or a cushion.

However, in this case, if a leaf spring, a cushion, or the like comes into contact with the battery element, depending on the material, it may electrochemically decompose or adversely affect the battery reaction, thereby deteriorating the characteristics of the battery. The trouble that causes it occurs. In addition, it is not desirable because energy other than the battery element is added in terms of energy density.

Further, in the above-described electronic apparatus, when a battery is mounted in a curved space, it is difficult to firmly fix the battery having such a curved shape to the curved space of a housing serving as an exterior material. Met.

In view of the foregoing, the present invention has been proposed in view of such a conventional situation, and enables a battery element having a curved shape to be firmly fixed to a curved internal space of an exterior material. It is an object of the present invention to provide a battery capable of preventing deterioration in characteristics, reduction in energy density, and the like. Another object of the present invention is to provide an electronic device capable of further miniaturization by mounting a battery having such a curved shape.

[0010]

A battery according to the present invention that achieves this object includes a battery element having a curved shape, and an exterior material having an internal space curved to a curvature different from the curvature of the battery element. And the battery element is housed in the inner space of the exterior material in an elastically deformed state.

As described above, in the battery according to the present invention, the curvature of the battery element is different from the curvature of the curvature in the internal space of the exterior material, so that the battery element is elastically deformed in the interior space of the exterior material. Since the battery element is stored, the battery element can be firmly fixed in the internal space of the exterior material.

According to another aspect of the present invention, there is provided an electronic device including a battery having a curved shape, the battery having an internal space curved to a curvature different from the curvature of the battery. It has a storage section, and the battery is
It is characterized in that it is housed in the internal space of the battery housing in an elastically deformed state.

As described above, in the electronic device according to the present invention,
Since the curvature of the battery is different from the curvature of the battery in the internal space of the battery housing, the battery is stored in the internal space of the battery housing in an elastically deformed state. Can be fixed firmly.

Further, in the electronic device, if the battery housing is provided in a curved portion of the housing, such a curved portion of the housing can be effectively used, and further downsizing can be achieved. Become.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, FIG. 1 shows a configuration example of a battery to which the present invention is applied. FIG. 1 is a schematic sectional view schematically showing the battery structure.

A battery 1 to which the present invention is applied includes a battery element 2 having a curved shape, and a battery case 4 as an exterior material having a curved internal space 3 having a different curvature from the curvature of the battery element 2. It is characterized in that the battery element 2 is housed in the internal space 3 of the battery case 4 in an elastically deformed state. That is, in the battery 1 of the present invention, the curvature of the battery element 2 differs from the curvature of the curvature in the internal space 3 of the battery case 4, so that the internal space of the battery case 4 is elastically deformed. It is characterized by being stored in.

Specifically, in the battery 1, the curvature of the battery element 2 is larger than the curvature of the curvature in the internal space 3 of the battery case 4.

In this case, when the battery element 2 is housed in the internal space 3 of the battery case 4, the convex surface of the battery element 2 has a concave surface of the internal peripheral surface constituting the internal space 3 of the battery case 4 and a substantially central portion A. At the same time, the concave surface of the battery element 2 comes into contact with the convex surface of the internal peripheral surface constituting the internal space 3 of the battery case 4 at substantially both ends B and C. When the battery element 2 is elastically deformed, the inner peripheral surface of the battery case 4 is pressed by an elastic force (bending).

Thus, in the battery 1, the battery element 2 can be firmly fixed in the internal space 3 of the battery case 4. Therefore, in the battery 1, it is possible to prevent the battery element 2 from being damaged due to vibration, impact, and the like, and to prevent deterioration of battery characteristics, a decrease in energy density, and the like.

Further, as the battery 1 to which the present invention is applied,
The curvature of the battery element 2 shown in FIG. 1 is not necessarily limited to the curvature greater than the curvature in the internal space 3 of the battery case 4, and the curvature of the battery element 2 and the curvature of the battery case 4 are not limited. What is necessary is that the curvature of the curvature in the internal space 3 is different.

For example, the curvature of the battery element 2 as shown in FIG. 2 may be smaller than the curvature of the curvature in the internal space 3 of the battery case 4.

In this case, when the battery element 2 is housed in the internal space 3 of the battery case 4, the convex surface of the battery element 2 has a concave surface of the internal peripheral surface constituting the internal space 3 of the battery case 4 and substantially both ends D. , E, and the concave surface of the battery element 2 is
It comes into contact with the convex surface of the inner peripheral surface constituting the internal space 3 of the battery case 4 at the substantially central portion F. When the battery element 2 is elastically deformed, the inner peripheral surface of the battery case 4 is pressed by an elastic force (bending).

Thus, in the battery 1, the battery element 2 can be firmly fixed in the internal space 3 of the battery case 4. Therefore, in the battery 1, it is possible to prevent the battery element 2 from being damaged by vibration, impact, and the like, and to prevent deterioration of battery characteristics, a decrease in energy density, and the like.

In the battery 1 to which the present invention is applied, it is desirable to use a battery case 4 having a higher Young's modulus than the battery element 2.

It is preferable to use, for example, a metal or a resin material as the material of the battery case 4.

This is because, when the battery element 2 is housed in the battery case 4 and the Young's modulus of the battery case 4 is lower than the Young's modulus of the battery element 2, the battery case 4 side is elastically deformed. In this case, the battery case 4 has a shape different from the original design, which results in a defective shape of the battery 1.

As described above, the battery 1 to which the present invention is applied has been described. As the above-described battery element 2, a battery element which has been generally used can be used.

Specifically, the battery element 2 has a structure in which a negative electrode plate 5 and a positive electrode plate 6 are laminated with a solid electrolyte 7 interposed therebetween, as shown in FIGS. FIG. 3 is a perspective plan view showing the configuration of the battery element 2, and FIG.
It is sectional drawing by line GG 'shown in the inside.

The negative electrode plate 5 is formed by laminating a negative electrode active material layer 9 on a negative electrode current collector 8 by, for example, casting or sintering.

The negative electrode current collector 8 is formed by molding a metal material such as copper, nickel, and stainless steel into, for example, a foil shape, a lath shape, a punched metal shape, or a net shape.

The negative electrode active material layer 9 is doped and dedoped with lithium.
Made of materials that can be doped, such as non-graphitizable carbon-based materials
Carbon materials such as graphite and graphite materials can be used. Yo
More specifically, for example, pyrolyzed carbons, cokes (picks)
Coke, needle coke, petroleum coke, etc.), black
Fired body of lead, glassy carbon, and organic polymer compound
Baking phenolic resin, furan resin, etc. at appropriate temperature, carbon
), Carbon fiber, activated carbon, etc.
Can be Also, doping and undoping lithium
Materials that can be cut include polyacetylene, polypyrrole, etc.
Polymer or SnO ₂And the like can be used.
When forming a negative electrode from such a material, a known method is used.
Can be added.

The positive electrode plate 6 is formed by laminating a positive electrode active material layer 11 on a positive electrode current collector 10 by, for example, cast coating or sintering.

The positive electrode current collector 10 is made of, for example, aluminum,
A metal material such as nickel or stainless steel is formed into a foil shape, a lath shape, a punched metal shape, a net shape, or the like.

The positive electrode active material layer 11 is made of a material suitable for the type of battery, such as a metal oxide and a metal sulfide or a specific polymer. More specifically, as metal oxides and metal sulfides, for example, TiS ₂ , MoS ₂ , NbSe ₂ , V ₂ O
Metal sulfide or metal oxide containing no lithium such as ₅ or Li _x MO ₂ (where M represents one or more transition metals, x varies depending on the charge / discharge state of the battery, and is usually 0.05 ≦ x .Ltoreq.1.10.). Further, the transition metal M constituting the lithium composite oxide is, for example, C
o, Ni, Mn and the like can be mentioned. Further, as such a lithium composite oxide, for example, L
iCoO ₂ , LiNiO ₂ , LiNi _y Co _1-y O ₂
(Where y in the formula is 0 <y <1), LiMn
₂ O _{4 and the} like can be mentioned. These lithium composite oxides generate a high voltage and become positive electrode active materials excellent in energy density.

When the positive electrode active material layer 11 is formed, the above-described positive electrode active materials may be used alone or in combination. When a positive electrode is formed from such a material, a known binder or the like can be added.

As the solid electrolyte 7, a gel electrolyte or a polymer solid electrolyte can be used.

The gel electrolyte includes a plasticizer, an electrolyte such as a lithium salt, and a matrix polymer.

The plasticizer is, for example, ethylene carbonate,
Propylene carbonate, butylene carbonate, γ-
Butyl lactone, γ-valerolactone, diethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxane, methyl acetate, methyl propionate, dimethyl carbonate, diethyl carbonate,
A non-aqueous solvent such as ethyl methyl carbonate can be used alone or as a component of the plasticizer. Also, if the content of the plasticizer is large, the ionic conductivity increases and the mechanical strength decreases. Conversely, when the content of the plasticizer is small, the ionic conductivity is reduced and the mechanical strength is increased.

The electrolyte in the gel electrolyte is a normal one.
Lithium salt used for electrolyte of lithium ion secondary battery
Can be used alone or as a mixture. For example, Li
PF ₆, LiBF₄, LiAsF₆, LiClO₄, L
iCF₃SO₄, LiN (SO₂CF₃)₂, LiAl
Cl₄, LiSiF₆Are preferred in terms of oxidation stability
No. LiPF contained in the plasticizer₆Lichiu etc.
The salt concentration is, for example, 0.3 mol / l to 2.5 mol.
/ L and the like are preferred.

As the matrix polymer, various polymers used when constituting the solid electrolyte 7 can be used. For example, fluorine-based polymers such as poly (vinylidene fluoride) and poly (vinylidene fluoride-co-hexafluoropropylene), poly (ethylene oxide)
Or ether-based polymers such as cross-linked products, or nylon-based,
Examples include urethane-based polymers, polyurea-based, polyacrylic acid derivatives, polymethacrylic acid derivatives, poly (acrylonitrile), and cross-linked products having a structure of ether, ester, or carbonate. In particular, it is preferable to use a crosslinked body having a structure of a fluorine-based polymer, ether / ester / carbonate, etc. from the viewpoint of redox stability.

The polymer solid electrolyte includes an electrolyte such as a lithium salt and a polymer compound.

As the electrolyte in the solid polymer electrolyte, those similar to those used for the gel electrolyte can be used.

The polymer compound may be, for example, an ether polymer such as poly (ethylene oxide) or a crosslinked product thereof, a poly (methacrylate) ester, an acrylate, an amine, an alkoxide, a nylon, a polyurea, or a urethane. Etc. can be used alone or in combination.

In the battery element 2, a negative electrode lead 13 and a positive electrode current collector 10 are formed by extending one end of a negative electrode lead connecting portion 12 formed by extending one end of the negative electrode current collector 8. The positive electrode lead 15 is connected to the positive electrode lead connection portion 14.

The battery element 2 is wrapped in a laminate film 16, and the negative electrode lead 13 and the positive electrode lead 15 are led out to the outside, and the hatched portion H shown in FIG.
Has a sealed structure by laminating the laminate film 16.

The negative electrode lead 13 and the positive electrode lead 15
Are provided with sealants 17 for improving the adhesiveness of the laminate film 16 when the battery element 2 is housed inside the laminate film 16 at the portions in contact with the laminate film 16, respectively.

It should be noted that the battery element 2 is not necessarily limited to the one sealed in such a laminate film 16, but is directly housed in the internal space 3 of the battery case 4 described above. Is also good.

In this battery element 2, as shown in FIG.
5 is curved in a direction substantially perpendicular to the mounting direction, but is not limited to such a curved direction.
For example, the bending direction of the battery element 2 may be substantially parallel to the mounting direction of the negative electrode lead 13 and the positive electrode lead 15. Next, an electronic device to which the present invention is applied will be described.

In this electronic device, a battery having a curved shape is mounted, so that the size of the electronic device can be further reduced. That is, in the electronic device to which the present invention is applied, as shown in FIG. 5, a battery housing portion 32 having a curved internal space 31 different from the curvature of the battery 30 is provided in, for example, a curved portion of the housing 33. Battery 3
The internal space 31 of the battery housing 32 is
It is stored in. FIG. 5 is a cross-sectional view of a main part schematically showing the internal structure of the electronic device.

Specifically, in this electronic device, the curvature of the battery 30 is greater than the curvature of the curvature in the internal space 31 of the battery housing 32.

In this case, when the battery 30 is housed in the internal space 31 of the battery housing 32, the convex surface of the battery 30 has a concave surface of the internal peripheral surface constituting the internal space 31 of the battery housing 32 and a substantially central portion I. At the same time, the concave surface of the battery 30 comes into contact with the convex surface of the internal peripheral surface constituting the internal space 31 of the battery housing portion 32 at substantially both ends J and K. When the battery 30 is elastically deformed, the inner peripheral surface of the battery housing portion 32 is pressed by an elastic force (bending).

As a result, in the electronic device, the battery 30 can be firmly fixed in the internal space 31 of the battery housing 32. Therefore, in this battery device, it is possible to prevent the battery 30 from being damaged by vibration, impact, and the like, to prevent deterioration of the battery characteristics and a decrease in energy density, and to prevent deterioration of the battery characteristics and energy density. , Etc. can be prevented.

In the electronic device, the battery 30 having such a curved shape is housed in the curved portion of the housing 33, so that the curved portion of the housing 33 can be effectively used. The size can be reduced.

In the electronic apparatus to which the present invention is applied, the curvature of the battery 30 shown in FIG.
The curvature of the battery 30 is not necessarily limited to be larger than the curvature of the internal space 31. The curvature of the battery 30 and the curvature of the internal space 31 of the battery housing 32 may be different.

For example, as shown in FIG. 6, the curvature of the battery 30 may be smaller than the curvature of the inside space 31 of the battery housing 32.

In this case, when the battery 30 is housed in the internal space 31 of the battery housing 32, the convex surface of the battery 30 has a concave surface of the internal peripheral surface constituting the internal space 31 of the battery housing 32 and substantially both ends L. , M, and the concave surface of the battery 30 comes into contact with the convex surface of the internal peripheral surface that forms the internal space 31 of the battery housing 32 at the substantially central portion N. And
When the battery 30 is elastically deformed, the inner peripheral surface of the battery housing portion 32 is pressed by an elastic force (bending).

As a result, in the electronic device, the battery 30 can be firmly fixed to the internal space 31 of the battery housing 32. Therefore, in this battery device, it is possible to prevent the battery 30 from being damaged by vibration, impact, and the like, to prevent deterioration of the battery characteristics and a decrease in energy density, and to prevent deterioration of the battery characteristics and energy density. , Etc. can be prevented.

In the electronic device, the battery 30 having such a curved shape is accommodated in the curved portion of the housing 33, so that the curved portion of the housing 33 can be effectively used. The size can be reduced.

The battery housing 32 of the electronic device is not limited to the curved portion of the housing 33, and is not particularly limited as long as it is a curved portion inside the electronic device.

In the electronic device, the above-described battery element 2 may be directly housed in the curved internal space 31 of the battery housing portion 32. In this case, the same effect can be obtained.

[0061]

EXAMPLES Examples of actually manufacturing a battery to which the present invention is applied will be described below. Further, a comparative example manufactured for comparison with these examples will be described.

<Example 1> In Example 1, 90 parts by weight of a pulverized graphite powder was first added to prepare a negative electrode plate.
Poly (vinylidene fluoride) -co-
Hexafluoropropylene) is mixed with 10 parts by weight to prepare a negative electrode mixture, and this negative electrode mixture is dispersed in N-methyl-2-pyrrolidone (NMP) to obtain a slurry negative electrode mixture. Next, a slurry-like negative electrode mixture was uniformly applied to one surface of a 10-μm-thick strip-shaped copper foil as a negative electrode current collector, dried, and then compression-molded with a roll press to produce a negative electrode plate. did.

Next, to prepare a positive electrode plate, first, lithium carbonate and cobalt carbonate were mixed at a molar ratio of 0.5: 1 to 1 mol, and calcined in air at 900 ° C. for 5 hours. , LiCoO ₂ . Next, the obtained LiC
90 parts by weight of oO ₂ , 6 parts by weight of graphite as a conductive agent, and poly (vinylidenefluoride-c) as a binder
o-Hexafluoropropylene) is mixed with 4 parts by weight to prepare a positive electrode mixture, and this positive electrode mixture is dispersed in NMP to form a slurry-type positive electrode mixture. Next, a slurry-like positive electrode mixture was uniformly applied to one side of a 20 μm-thick strip-shaped aluminum foil as a positive electrode current collector, dried, and then compression-molded with a roll press to produce a positive electrode plate. did.

Next, 42.5 parts by weight of ethylene carbonate (EC), 42.5 parts by weight of propylene carbonate (PC), and LiPF as an electrolyte salt were placed on the negative electrode plate and the positive electrode plate.
₆ and 15 parts by weight, and 30 parts by weight of a plasticizer obtained, and 10 parts of poly (vinylidene fluoride-co-hexafluoropropylene) as a matrix polymer.
Part by weight and 60 parts by weight of dimethyl carbonate are mixed, and a solution obtained by dissolving the mixture is uniformly applied and impregnated. Then, the mixture is allowed to stand at room temperature for 8 hours to vaporize and remove dimethyl carbonate. Was formed by lamination.

Next, the negative electrode plate and the positive electrode plate are pressure-bonded to each other so that the surfaces on which the gel electrolyte is formed face each other so as to have a curved shape.
m, a battery element 2 having a curved shape with a thickness of 0.3 mm
Was prepared.

Next, a 20 mm long, 5 mm wide, and 0.0 mm thick negative electrode current collector was formed by extending one end of the negative electrode current collector to the negative electrode lead connection portion having an area of 5 mm × 5 mm.
A 5 mm nickel negative electrode lead and a 5 mm × 5 mm area positive electrode lead connecting portion formed by extending one end of a positive electrode current collector have a length of 20 mm, a width of 5 mm, and a thickness of 0.05 mm.
The aluminum positive electrode lead was connected by ultrasonic welding.

Next, the negative electrode lead terminal and the positive electrode lead provided with the battery element were housed inside the laminate film while being led out. Each of the negative electrode lead and the positive electrode lead is provided with a sealant at a portion that comes into contact with the laminate film to improve adhesion to the laminate film when the battery element is housed inside the laminate film. Next, the battery element was sealed in the laminate film by laminating the periphery of the laminate film containing the battery element therein.

Next, a battery case having an internal space curved to a curvature different from the curvature of the battery element was prepared, and the battery element was housed in the internal space of the battery case in an elastically deformed state. A battery having a curved shape was manufactured as described above.

At this time, the curvature of the battery element was set to be larger than the curvature of the inside space of the battery case. The battery case used had a Young's modulus higher than the Young's modulus of the battery element.

<Example 2> In Example 2, a battery having a curved shape was formed in the same manner as in Example 1 except that the curvature of the battery element was smaller than the curvature of curvature in the internal space of the battery case. Produced.

Comparative Example 1 In Comparative Example 1, a battery having a curved shape was formed in the same manner as in Example 1 except that the curvature of the battery element and the curvature of the inside space of the battery case were the same. Produced.

Comparative Example 2 In Comparative Example 2, a battery having a curved shape was produced in the same manner as in Example 1, except that the Young's modulus of the battery case was lower than the Young's modulus of the battery element.

Comparative Example 3 In Comparative Example 3, a battery having a curved shape was produced in the same manner as in Example 2, except that the Young's modulus of the battery case was lower than that of the battery element.

The batteries of Examples 1 and 2 and Comparative Examples 1 to 3 manufactured as described above were heated at 23 ° C.
The constant-current constant-voltage charging is performed for 30 hours to 4.2 V at a theoretical capacity of 10 hours (hereinafter referred to as 0.1 C) in an atmosphere of 30 hours, and then at a 2-hour rate (hereinafter referred to as 0.5 C). The constant current discharge was performed up to 3.0V. The electric capacity of each battery obtained at this time was defined as the initial discharge capacity.

Next, the battery was charged at a constant current and a constant voltage of 0.5 V in an atmosphere of 23 ° C. to 4.2 V for 6 hours, and then vibrated in the bending direction of the battery at a cycle of 2 Hz for 24 hours. .

Thereafter, a constant current discharge is performed at 3.0 V at 0.5 C.
And the discharge capacity was measured. The electric capacity of the battery obtained at this time was defined as the discharge capacity after vibration.

Then, assuming that the initial discharge capacity is 100,
The discharge capacity after the vibration was represented by the ratio, and was regarded as the maintenance rate after the vibration.

The occurrence of shape defects was examined for each of these batteries.

Table 1 below shows the measurement results of the retention rate and shape defect after vibration of each of these batteries.

[0080]

[Table 1]

As can be seen from Table 1, in the batteries of Examples 1 and 2, the retention ratio after vibration was high, and the shapes of the batteries were as designed.

On the other hand, in the battery of Comparative Example 1, although the shape of the battery was as designed, the maintenance ratio after vibration was lower than that of the other batteries.

Since the curvature of the battery element is the same as the curvature of the inner space of the battery case, the battery element is not firmly fixed in the inner space of the battery case and is damaged by vibration. Because they will receive it.

Further, in the battery of Comparative Example 2, although the maintenance ratio after vibration was good, the battery shape was more bent than designed.

This is because the Young's modulus of the battery case is lower than the Young's modulus of the battery element, and the battery case side is elastically deformed by the elastic force (bending) of the battery element housed in the internal space of the outer case.

In this case, since the curvature of the battery element is larger than the curvature of the curvature in the internal space of the battery case, the shape of the battery is bent more than designed according to the curved shape of the battery element. turn into.

Further, in the battery of Comparative Example 3, although the maintenance ratio after vibration was good, the battery shape was flatter than the design.

This is because the Young's modulus of the battery case is lower than the Young's modulus of the battery element, and the battery case side is elastically deformed by the elastic force (bending) of the battery element housed in the internal space of the battery case.

In this case, since the curvature of the battery element is smaller than the curvature of the curvature in the internal space of the battery case, the battery shape follows the curved shape of the battery element and becomes flatter than designed. I will.

From the above, the curvature of the battery element is made different from the curvature of the curvature in the internal space of the battery case, and the battery element is housed in the internal space of the battery case in an elastically deformed state. Making the Young's modulus of the battery case higher than the Young's modulus of the element is effective in preventing a battery element from being damaged due to vibration or impact, and for producing a battery having a curved shape without deterioration of battery characteristics. It was revealed.

[0091]

As described above, in the battery according to the present invention, the curvature of the battery element is different from the curvature of the curvature in the internal space of the exterior material, so that the exterior of the battery element is elastically deformed. Since the battery element is housed in the internal space of the material, the battery element can be firmly fixed to the internal space of the exterior material. Therefore, according to this battery, it is possible to prevent damage to the battery element due to vibration, impact, and the like, and to prevent deterioration of battery characteristics, a decrease in energy density, and the like.

In the electronic device according to the present invention, since the curvature of the battery is different from the curvature of the battery in the internal space of the battery housing, the battery is stored in the internal space of the battery housing in an elastically deformed state. Therefore, the battery can be firmly fixed in the internal space of the battery housing. Therefore, according to this battery device, it is possible to prevent damage to the battery due to vibration, impact, and the like, and to prevent deterioration of battery characteristics, a decrease in energy density, and the like.

In this electronic device, if the battery housing is provided in a curved portion of the housing, such a curved portion of the housing can be effectively used, and further downsizing can be achieved. Becomes

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view schematically showing the internal structure of a battery applied in the present invention, showing a state where the curvature of the battery element is larger than the curvature in the internal space of the battery case. It is.

FIG. 2 is a conceptual cross-sectional view schematically showing the internal structure of the battery, showing a state in which the curvature of the battery element is smaller than the curvature of the curvature in the internal space of the battery case.

FIG. 3 is a perspective plan view showing a configuration of a battery element applied in the present invention.

FIG. 4 is a sectional view taken along line GG ′ shown in FIG. 3;

FIG. 5 is a conceptual cross-sectional view schematically showing the internal structure of an electronic device to which the present invention is applied, and shows a state where the curvature of the battery is larger than the curvature in the internal space of the battery housing. FIG.

FIG. 6 is a conceptual cross-sectional view schematically showing the internal structure of the electronic device, showing a state where the curvature of the battery is larger than the curvature in the internal space of the battery housing.

FIG. 7 is a conceptual sectional view schematically showing the internal structure of a conventional battery.

[Description of Signs] 1 battery, 2 battery element, 3 internal space, 4 battery case, 5 negative electrode plate, 6 positive electrode plate, 7 solid electrolyte, 30 batteries, 31 internal space, 32 battery storage section, 33 housing

Continued on the front page (72) Inventor Hatta alone F-term (reference) 5H011 AA06 BB04 DD06 KK00 5H029 AJ00 AK02 AK03 AK04 AK05 AL02 AL07 AL08 AL12 AM00 AM03 AM04 AM16 BJ04 BJ23 5H040 AA02 AS13 AS14 AY03 CC34

Claims (11)

[Claims] 1. A battery element having a curved shape, and an exterior material having an inner space curved to a curvature different from the curvature of the battery element, wherein the battery element is elastically deformed, and A battery stored in an internal space of a material. 2. The battery according to claim 1, wherein the exterior material has a higher Young's modulus than the battery element. 3. The battery according to claim 1, wherein the battery element includes a negative electrode containing a material capable of doping / dedoping lithium. 4. The battery according to claim 3, wherein the negative electrode contains a carbon material as a material capable of doping / dedoping lithium. 5. The battery according to claim 1, wherein the battery element includes a positive electrode containing a composite oxide of lithium and a transition metal. 6. An electronic device on which a battery having a curved shape is mounted, comprising: a battery housing having an internal space curved to a curvature different from the curvature of the battery, wherein the battery is elastically deformed. An electronic device, wherein the electronic device is stored in an internal space of the battery storage unit in a state. 7. The electronic device according to claim 6, wherein a Young's modulus of a member forming the battery housing portion is higher than a Young's modulus of the battery. 8. The electronic device according to claim 6, wherein the battery includes a negative electrode containing a material capable of doping / dedoping lithium. 9. The electronic device according to claim 8, wherein the negative electrode contains a carbon material as a material capable of doping / dedoping lithium. 10. The electronic device according to claim 6, wherein the battery includes a positive electrode containing a composite oxide of lithium and a transition metal. 11. The battery device according to claim 6, wherein the battery storage section is provided in a curved portion of the housing.