阅读说明：本技术 电子部件安装基板、电池组及电子设备 (Electronic component mounting board, battery pack, and electronic device ) 是由 森靖 于 2019-02-06 设计创作，主要内容包括：电子部件安装基板具备：基板,具有第一基板端子、第二基板端子以及设置在第一基板端子与第二基板端子之间的绝缘物；以及电子部件,具有与第一基板端子连接的第一端子和与第二基板端子连接的第二端子,并设置在绝缘物上。绝缘物相对于基板的表面具有凸状,相对于电子部件的周缘中的第一端子与第二端子之间的周缘部分突出。绝缘物相对于周缘部分的突出长度x和电子部件在从第一端子朝向第二端子的方向上的长度a满足x≥a/4的关系。(The electronic component mounting substrate includes: a substrate having a first substrate terminal, a second substrate terminal, and an insulator disposed between the first substrate terminal and the second substrate terminal; and an electronic component having a first terminal connected to the first board terminal and a second terminal connected to the second board terminal, and provided on the insulator. The insulator has a convex shape with respect to the surface of the substrate, and protrudes from a peripheral portion between the first terminal and the second terminal in the peripheral edge of the electronic component. The protruding length x of the insulator with respect to the peripheral edge portion and the length a of the electronic component in the direction from the first terminal toward the second terminal satisfy a relationship of x ≧ a/4.)

1. An electronic component mounting substrate is provided with:

a substrate having a first substrate terminal, a second substrate terminal, and an insulator disposed between the first substrate terminal and the second substrate terminal; and

an electronic component having a first terminal connected to the first board terminal and a second terminal connected to the second board terminal, and provided on the insulator,

the insulator has a convex shape with respect to a surface of the substrate, protrudes with respect to a peripheral portion between the first terminal and the second terminal in a peripheral edge of the electronic component,

the length x of the protrusion of the insulator with respect to the peripheral portion and the length a of the electronic component in the direction from the first terminal toward the second terminal satisfy a relationship of x ≧ a/4.

2. The electronic component mounting substrate according to claim 1,

the electronic component is an all-solid-state battery.

3. The electronic component mounting substrate according to claim 1 or 2, wherein,

the substrate further includes a first solder for soldering the first terminal to the first substrate terminal and a second solder for soldering the second terminal to the second substrate terminal,

the width w of the insulator satisfies the following relation of formula (1):

w≤2×(a/c)×((c/2)-b)…(1)

wherein a is a length of the electronic component in a direction from the first terminal toward the second terminal, b is a thickness of the insulator, and c is a thickness of the first solder and the second solder before reflow.

4. The electronic component mounting substrate according to any one of claims 1 to 3,

the substrate has a plurality of the first substrate terminals and a plurality of the second substrate terminals,

a plurality of the electronic components are arranged on the insulator in such a manner that the peripheral portions are opposed to each other,

the insulator has an extension portion extending in a direction from the first terminal toward the second terminal between the adjacent electronic components.

5. An electronic component mounting substrate is provided with:

a substrate having a first substrate terminal, a second substrate terminal, and an insulator disposed between the first substrate terminal and the second substrate terminal; and

an electronic component having a first terminal connected to the first board terminal and a second terminal connected to the second board terminal, and provided on the insulator,

the insulator has a convex shape with respect to a surface of the substrate, protrudes with respect to a peripheral portion between the first terminal and the second terminal in a peripheral edge of the electronic component,

the longer distance y of the length x of the protrusion of the insulator from the peripheral portion, the distance from the first end of the peripheral portion to the protrusion position of the insulator, and the distance from the second end of the peripheral portion to the protrusion position of the insulator satisfies a relationship of x ≧ y/2.

6. A battery pack comprising the electronic component mounting substrate according to any one of claims 1 to 5.

7. An electronic device comprising the electronic component mounting substrate according to any one of claims 1 to 5.

8. An electric vehicle provided with the electronic component mounting substrate according to any one of claims 1 to 5.

Technical Field

The invention relates to an electronic component mounting board, a battery pack, and an electronic apparatus.

Background

Various electronic component mounting boards have been proposed in which an electronic component is mounted on a board. For example, patent document 1 proposes an electronic component mounting board in which an insulating layer is provided between electrode pads on a board. Patent document 1 describes the following: since the solder connecting the electrode and the electrode pad is shielded by the insulating layer, the solder can be prevented from flowing between the adjacent electrode and the electrode pad, and an electrical short circuit via the solder between the electrode and the electrode pad can be more reliably prevented.

Disclosure of Invention

Technical problem to be solved by the invention

However, in the electronic component mounting board proposed in patent document 1, when water droplets adhere to the peripheral portion of the electronic component due to high-temperature and high-humidity atmosphere, dew condensation, or the like, there is a possibility that the electrodes, the electrode pads, or the like are connected by the water droplets depending on the size of the water droplets, and electrolytic corrosion occurs.

An object of the present invention is to provide an electronic component mounting board capable of suppressing the occurrence of electrolytic corrosion even when water droplets adhere to a peripheral portion of an electronic component, and a battery pack and an electronic apparatus provided with the electronic component mounting board.

In order to solve the above-described problems, a first aspect of the present invention is an electronic component mounting board,

the electronic component mounting substrate includes:

a substrate having a first substrate terminal, a second substrate terminal, and an insulator disposed between the first substrate terminal and the second substrate terminal; and

an electronic component having a first terminal connected to the first board terminal and a second terminal connected to the second board terminal, and provided on the insulator,

the insulator has a convex shape with respect to the surface of the substrate, protrudes with respect to a peripheral portion between the first terminal and the second terminal in the peripheral edge of the electronic component,

the protruding length x of the insulator with respect to the peripheral edge portion and the length a of the electronic component in the direction from the first terminal toward the second terminal satisfy a relationship of x ≧ a/4.

According to the above configuration, the protruding length x of the insulator and the length a of the electronic component satisfy the relationship of x ≧ a/4, and therefore, even when water droplets adhere to the peripheral portion of the electronic component due to high-temperature and high-humidity atmosphere, dew condensation, or the like, the protruding length x of the insulator is equal to or greater than the height of the water droplets. This can prevent the first terminal and the second terminal, or the first board terminal and the second board terminal from being connected to each other by water droplets. Therefore, the occurrence of electrolytic corrosion can be suppressed.

In the first invention, the electronic component may be an all-solid-state battery.

According to the above configuration, the electrolytic corrosion of the all-solid battery can be suppressed.

In the first invention, it is preferable that the board further includes a first solder for soldering the first terminal to the first board terminal and a second solder for soldering the second terminal to the second board terminal, and the width w of the insulator 23 satisfies a relationship of the following expression (1):

w≤2×(a/c)×((c/2)-b)…(1)

(wherein a is a length of the electronic part in a direction from the first terminal toward the second terminal, b is a thickness of the insulator 23, and c is a thickness of the first solder and the second solder before reflow)

According to the above configuration, even when the electronic component is placed on the surface of the substrate with the insulator inclined with respect to the surface, contact between the first terminal and the first solder and contact between the second terminal and the second solder can be ensured. Therefore, the occurrence of solder failure can be suppressed.

In the first invention, it is preferable that the substrate has a plurality of first substrate terminals and a plurality of second substrate terminals, the plurality of electronic components are provided on the insulator such that peripheral portions thereof face each other, and the insulator has an extension portion extending in a direction from the first terminals toward the second terminals between adjacent electronic components.

According to the above configuration, even when water droplets adhere to the peripheral edge portions of the electronic components due to a high-temperature and high-humidity atmosphere, dew condensation, or the like, the connection of the adjacent electronic components by the water droplets can be suppressed. Therefore, the occurrence of electrolytic corrosion can be suppressed.

The second invention is an electronic component mounting board comprising,

the electronic component mounting substrate includes:

a substrate having a first substrate terminal, a second substrate terminal, and an insulator disposed between the first substrate terminal and the second substrate terminal; and

an electronic component having a first terminal connected to the first board terminal and a second terminal connected to the second board terminal, and provided on the insulator,

the insulator has a convex shape with respect to the surface of the substrate, protrudes with respect to a peripheral portion between the first terminal and the second terminal in the peripheral edge of the electronic component,

the longer distance y of the projection length x of the insulator with respect to the peripheral portion, the distance from the first end of the peripheral portion to the projection position of the insulator, and the distance from the second end of the peripheral portion to the projection position of the insulator satisfies the relationship of x ≧ y/2.

According to the above configuration, the protruding length x of the insulator and the length a of the electronic component satisfy the relationship of x ≧ y/2, and therefore, even when water droplets adhere to the peripheral portion of the electronic component due to high-temperature and high-humidity atmosphere, dew condensation, or the like, the protruding length x of the insulator is equal to or greater than the height of the water droplets. This can prevent the first terminal and the second terminal, or the first board terminal and the second board terminal from being connected to each other by water droplets. Therefore, the occurrence of electrolytic corrosion can be suppressed.

A third aspect of the invention is a battery pack including the electronic component mounting board according to the first or second aspect of the invention.

A fourth aspect of the present invention is an electronic device including the electronic component mounting board according to the first or second aspect.

A fifth aspect of the invention is an electric vehicle including the electronic component mounting board according to the first or second aspect of the invention.

According to the present invention, even when water droplets adhere to the peripheral portion of the electronic component, the occurrence of electrolytic corrosion can be suppressed. The effects described herein are not necessarily limited, and may be any of the effects described in the present invention or different effects from them.

Drawings

Fig. 1 is an exploded perspective view showing a structure of a battery pack according to an embodiment of the present invention.

Fig. 2A is a plan view showing the structure of the electronic component mounting substrate. Fig. 2B is a sectional view taken along line IIB-IIB of fig. 2A.

Fig. 3A is an enlarged plan view showing a case where the contact angle of a water droplet on the side surface of the battery is 90 °. Fig. 3B is an enlarged plan view showing a case where the contact angle of a water droplet on the side surface of the battery is 180 °.

Fig. 4A is a side view showing an electronic component mounting substrate in a state where no solder failure occurs. Fig. 4B is a side view showing the electronic component mounting substrate in a state where a solder failure has occurred. Fig. 4C is a side view for explaining a condition that no solder failure occurs.

Fig. 5 is a sectional view showing the structure of the battery.

Fig. 6 is a circuit diagram showing a circuit configuration of the electronic component mounting substrate.

Fig. 7A and 7B are plan views each showing a modification of the electronic component mounting substrate.

Fig. 8A and 8B are plan views each showing a modification of the electronic component mounting substrate.

Fig. 9 is an enlarged plan view showing a modification of the electronic component mounting substrate.

Fig. 10 is a perspective view showing an external appearance of a wrist-worn electronic device as an application example.

Fig. 11 is a block diagram showing a configuration of a wrist-worn electronic device as an application example.

Fig. 12 is a schematic diagram showing a configuration of a hybrid vehicle as an application example.

Fig. 13 is a schematic diagram showing a configuration of an electric storage system as an application example.

Detailed Description

The embodiments of the present invention will be explained in the following order.

1 an embodiment

1.1 Structure of Battery pack

1.2 Circuit Structure of Battery pack

1.3 Effect

1.4 modification

2 example of application

2.1 wrist strap electronic device as application example

2.2 hybrid vehicle as application example

2.3 electric storage System as application example

<1 embodiment >

[1.1 Structure of Battery pack ]

As shown in fig. 1, the battery pack according to one embodiment of the present invention includes an outer case 10, an electronic component mounting board 20 housed in the outer case 10, and a cable connector 30 connected to the electronic component mounting board 20.

(outer case)

The exterior case 10 includes a case body 11 and a lid 12, the case body 11 has a thin box shape with one main surface opened, and the lid 12 is provided to close the opened one main surface. The housing body 11 has a hole 11A in a peripheral wall portion, and the cable connector 30 is led out from the hole 11A to the outside. The outer case 10 is made of, for example, polymer resin or metal.

(Cable connector)

The cable connector 30 includes a cable 31 and a connector 32 provided at one end of the cable 31. The other end of the cable 31 is connected to the electronic component mounting board 20. The connector 32 is configured to be connectable to an electronic device or the like.

(electronic parts mounting board)

The electronic component mounting board 20 includes a flat printed circuit board (hereinafter, simply referred to as "board") 21 and a rectangular thin plate-like battery 22 provided on one surface of the board 21. As shown in fig. 2A and 2B, the substrate 21 includes a substrate main body 211, pads (first and second substrate terminals) 212A and 212B provided on one surface of the substrate main body 211, a resist layer (protective layer) 213 provided so as to cover the one surface of the substrate main body 211, and an insulator 23 provided between the pads 212A and 212B on the surface of the resist layer 213. The battery 22 has a positive electrode terminal (first terminal) 22A and a negative electrode terminal (second terminal) 22B connected to the pads 212A and 212B, respectively, and is provided on the insulator 23.

On one surface of the substrate main body 211, in addition to the pads 212A, 212B, solders 24A, 24B, a positive terminal 25A, a negative terminal 25B, a protection IC (Integrated Circuit) 26, and a charge/discharge FET27 are provided.

The insulator 23 has a convex shape on one surface with respect to the substrate 21. When the electronic component mounting board 20 is viewed in plan from a direction perpendicular to the one surface on which the battery 22 is mounted, the insulator 23 has a linear shape, and both ends thereof protrude perpendicularly to both side surfaces (peripheral edge portions) S1, S2 between the positive terminal 22A and the negative terminal 22B. The protruding position of the insulator 23 is the center position of the side faces S1, S2. The length x of the protrusion of the insulator 23 from the side surfaces S1 and S2 and the length a of the battery 22 in the direction from the positive terminal 22A to the negative terminal 22B satisfy the relationship of x ≧ a/4.

Now, with reference to FIG. 3A, the reason why the protrusion length x of the insulator 23 is x.gtoreq.a/4 will be described. Here, it is assumed that the contact angle of the water droplet 41 on the side surfaces S1, S2 of the cell 22 is 90 °. When water droplets 41 adhere to side surfaces S1 and S2 of battery 22 due to high-temperature and high-humidity atmosphere, condensation, or the like, surface tension acts on the surfaces of adhering water droplets 41. This reduces the surface area of water droplets 41, and the droplets are formed into a hemispherical shape. When the water droplet 41 divided into two by the insulator 23 is attached to a half of the side surfaces S1 and S2, the radius of the water droplet 41 is (a/2)/2 a/4. Therefore, if the protruding length x of the insulator 23 and the length a of the battery 22 satisfy the relationship of x ≧ a/4, the protruding length x of the insulator 23 is equal to or greater than the height h of the water droplet 41, and connection between the positive electrode terminal 22A and the negative electrode terminal 22B by the water droplet 41 can be suppressed. Therefore, the occurrence of electrolytic corrosion can be suppressed. For example, when the size of the battery 22 is 10mm × 10mm, if the protruding length x of the insulator 23 is 2.5mm or more, the occurrence of electrolytic corrosion can be suppressed.

It is considered that the contact angle of the water droplet 41 on the surface of a general electronic component (for example, a battery) mounted on the electronic component mounting board is usually 90 ° or less. Therefore, if the protruding width of the insulator 23 is defined as described above, the occurrence of electrolytic corrosion of a general electronic component can be suppressed. However, even when the contact angle of the water droplet 41 on the surface of the electronic component such as the cell 22 exceeds 90 ° as shown in FIG. 3B, if the protruding length x of the insulator 23 and the length a of the cell 22 satisfy the relationship of x.gtoreq.a/4, the water droplet 41 is less likely to exceed the insulator 23. Therefore, the occurrence of electrolytic corrosion of electronic components such as the battery 22 can be suppressed. Fig. 3B shows a case where the contact angle of water droplet 41 is 180 °, that is, water droplet 41 is spherical, as an extreme example, but the contact angle of water droplet 41 exceeding 90 ° is not limited to this.

From the viewpoint of further suppressing the occurrence of electrolytic corrosion, the protrusion length x of the insulator 23 and the length a of the battery 22 preferably satisfy the relationship of x.gtoreq.a/3, and more preferably satisfy the relationship of x.gtoreq.a/2. The upper limit of the protruding length x of the insulator 23 is not particularly limited, and x ≦ a, for example.

The insulator 23 includes, for example, at least one of a thermosetting resin and an energy ray-curable resin. The thermosetting resin contains, for example, at least one of an epoxy resin, a phenol resin, an unsaturated polyester, and a melamine resin. The energy ray-curable resin is preferably an ultraviolet-curable resin. The ultraviolet curable resin may be either a radical polymerization system or a cationic polymerization system. The insulator 23 may be an adhesive or a wire.

The insulator 23 may contain a known additive as needed. For example, the insulator 23 may contain a pigment such as barium sulfate particles or titanium oxide particles. The insulator 23 may contain at least one of an antistatic agent, a heat stabilizer, an antioxidant, a dispersant, a flame retardant, a surface conditioner (an antifoaming agent, a leveling agent, and the like), a plasticizer, and the like.

As a method for forming the insulator 23, for example, screen printing, inkjet printing, or the like can be used, but the method is not limited to these methods.

The width w of the insulator 23 preferably satisfies the relationship of the following formula (1).

w≤2×(a/c)×((c/2)-b)…(1)

(wherein, as shown in FIG. 4A, a is the length of the battery 22 in the direction from the positive terminal 22A toward the negative terminal 22B, B is the thickness of the insulator 23, and C is the thickness of the solder pastes 24C and 24D before reflow)

By making the width w of the insulator 23 satisfy the relationship of the above expression (1), even when the battery 22 is placed on one surface of the substrate 21 in an inclined manner with respect to the one surface, contact between the positive electrode terminal 22A and the solder paste 24C and contact between the negative electrode terminal 22B and the solder paste 24D can be ensured. Therefore, the occurrence of solder failure can be suppressed.

The derivation process of the above formula (1) will be described below. Here, as shown in fig. 4A, a case where the battery 22 is placed on one surface of the substrate 21 so as to be inclined with respect to the one surface is considered. As shown in fig. 4A, when the width w of the insulator 23 is narrow, the battery 22 is not greatly inclined by the insulator 23, and therefore the negative electrode terminal 22B of the battery 22 is in contact with the upper end of the solder paste 24D. In the case where the contact of the negative electrode terminal 22B with the solder paste 24D is thus ensured, no solder failure occurs. On the other hand, as shown in fig. 4B, when the width w of the insulator 23 is wide, the battery 22 is greatly inclined by the insulator 23, and therefore the negative electrode terminal 22B of the battery 22 does not contact the upper end of the solder paste 24D. In the case where the contact between the negative electrode terminal 22B and the solder paste 24D is not ensured in this way, solder failure may occur. Therefore, in order to suppress the occurrence of solder failure, the width w of the insulator 23 is preferably set to an appropriate range.

As shown in fig. 4C, the angle formed by the bottom surface of the battery 22 and one surface of the substrate 21 is θ, and the angle formed by the maximum contact between the negative terminal 22B and the solder paste 24D is securedTheta is set to theta_maxIn the case of (3), if the relationship of the following expression (2) is satisfied, the occurrence of solder failure can be suppressed.

θ≤θ_max…(2)

At theta, theta_maxIn the case of a very small size (for example, in the case where the thickness C of the solder pastes 24C and 24D is about 0.1 mm), the formula (2) can be rewritten as the following formula (3). When a is 1mm, θ is about 6 °, and when a is 10mm, θ is about 1 °.

tanθ≤tanθ_max…(3)

When expression (3) is modified by using a, b, and x, the following expression (4) is used:

b/((a/2)-x)≤c/a…(4)

when equation (3) is solved for x, the following equation (5) is expressed:

x≤(a/c)×((c/2)-b)…(5)

the above expression (1) is derived by multiplying both sides of the expression (5) by 2 times.

The substrate body 211 is a rigid substrate having insulation properties. Specific examples of the substrate body 211 include a phenol paper substrate, a paper epoxy substrate, a glass composite substrate, a glass epoxy substrate, a teflon (registered trademark) substrate, an alumina (ceramic) substrate, a low temperature co-fired ceramic (LTCC) substrate, a composite substrate, a halogen-free substrate, and the like, but are not limited thereto.

The pads 212A and 212B are formed by patterning copper foil into a predetermined shape. The solders 24A and 24B are used to solder the positive electrode terminal 22A and the negative electrode terminal 22B to the pads 212A and 212B, respectively. The solders 24A and 24B are lead-free solders such as solder paste. The cable 31 is electrically connected to the positive terminal 25A and the negative terminal 25B.

The resist layer 213 has holes in portions corresponding to the pads 212A and 212B, the positive terminal 25A, the negative terminal 25B, the protection IC26, and the charge/discharge FET27, and these portions are exposed from the resist layer 213. The resist layer 213 includes a solder resist, protects the pads 212A, 212B, and the like formed of copper foil or the like, and suppresses unnecessary adhesion of solder at the time of soldering.

(Battery)

The battery 22 is an example of an electronic component, specifically, a large-capacity all-solid-state battery. Specific examples of the all-solid-state battery include an all-solid-state lithium battery, an all-solid-state sodium battery, an all-solid-state potassium battery, an all-solid-state magnesium battery, and an all-solid-state calcium battery, and among them, an all-solid-state lithium battery is preferable, but the battery is not limited thereto. Here, a case where the battery 22 is a secondary battery will be described, but the battery 22 may be a primary battery.

As shown in fig. 5, the battery 22 includes a rectangular thin plate-shaped battery element 220, and a positive electrode terminal 22A and a negative electrode terminal 22B provided on opposite end surfaces 220SA and 220SB of the battery element 220, respectively. Battery 22 may further include an exterior material (not shown) covering the surface of battery element 220 except for end surfaces 220SA and 220 SB.

Battery element 220 includes positive electrode layer 221, negative electrode layers 222M and 222N, and solid electrolyte 223. Negative electrode layer 222M is provided such that one main surface thereof faces one main surface of positive electrode layer 221, and solid electrolyte 223 is provided between negative electrode layer 222M and positive electrode layer 221. Negative electrode layer 222N is provided such that one main surface thereof faces the other main surface of positive electrode layer 221, and solid electrolyte 223 is provided between negative electrode layer 222N and positive electrode layer 221.

The solid electrolyte 223 covers the circumferential surface of the positive electrode layer 221 as follows: a part of the circumferential surface of positive electrode layer 221 is exposed from end surface 220SA of battery element 220, and the other circumferential surface is not exposed from the surface of battery element 220. A part of the circumferential surface of positive electrode layer 221 exposed from end surface 220SA of battery element 220 contacts positive electrode terminal 22A.

The solid electrolyte 223 covers the circumferential surfaces of the negative electrode layers 222M, 222N as follows: part of the circumferential surfaces of the negative electrode layers 222M and 222N is exposed from the end surface 220SB of the battery element 220, and the other circumferential surfaces are not exposed from the surface of the battery element 220. Part of the circumferential surfaces of negative electrode layers 222M and 222N exposed from end surface 220SB of battery element 220 is in contact with negative electrode terminal 22B. The solid electrolyte 223 may cover the other main surface of the negative electrode layers 222M and 222N.

The positive electrode layer 221 includes a positive electrode current collector 221A and positive electrode active material layers 221B provided on both main surfaces of the positive electrode current collector 221A. The negative electrode layers 222M and 222N include a negative electrode current collector 222A and a negative electrode active material layer 222B provided on one main surface of the negative electrode current collector 222A. The negative electrode layers 222M, 222N are provided so that the negative electrode active material layer 222B faces the positive electrode active material layer 2221B.

[1.2 Circuit Structure of Battery pack ]

Hereinafter, a circuit configuration of the battery pack will be described with reference to fig. 6. The positive terminal 22A of the battery 22 is connected to the positive terminal 25A of the substrate 21 by wiring. The negative terminal 22B of the battery 22 is connected to the negative terminal 25B of the substrate 21 by a wire.

The control unit 26 controls the charge/discharge FET27 to control the charge/discharge operation of the battery 22. The control unit 26 controls the charge/discharge FET27 to control the charge/discharge operation so that the charge voltage does not become excessively large during charge/discharge, so that an overcurrent does not flow due to a load short circuit, and so that overdischarge does not occur.

The charge/discharge FET27 includes a charge control FET (Field Effect Transistor) 27A and a discharge control FET 27B. The charge control FET27A and the discharge control FET27B are on/off controlled based on the control of the control unit 26.

The parasitic diode 27C is connected between the drain and source of the charge control FET27A, and the parasitic diode 27D is connected between the drain and source of the discharge control FET 27B. The parasitic diode 27C has a polarity in the direction opposite to the charging current and in the direction coincident with the discharging current. The parasitic diode 27D has a polarity in the same direction as the charging current and in the opposite direction to the discharging current.

Control signals from the control unit 26 are supplied to the gates of the charge control FET27A and the discharge control FET27B, respectively. The charge control FET27A and the discharge control FET27B are P-channel type, and are turned on by a gate potential lower than the source potential by a predetermined value or more. During charging and discharging, the charge control FET27A and the discharge control FET27B are in the on state.

Note that, as the charge control FET27A and the discharge control FET27B, N-channel FETs may be used. When an N-channel FET is used, the charge control FET27A and the discharge control FET27B are turned on by a gate potential higher than the source potential by a predetermined value or more.

[1.3 Effect ]

The electronic component mounting board 20 according to the above-described embodiment includes the board 21 and the battery 22, the board 21 includes the lands 212A and 212B and the insulator 23 provided between the lands 212A and 212B, and the battery 22 includes the positive electrode terminal 22A and the negative electrode terminal 22B connected to the lands 212A and 212B, respectively, and is provided on the insulator 23. The insulator 23 has a convex shape on one surface of the substrate 21, and protrudes from both side surfaces S1 and S2 between the positive electrode terminal 22A and the negative electrode terminal 22B. The length x of the insulator 23 protruding from the both side surfaces S1 and S2 and the length a of the battery 22 in the direction from the positive terminal 22A to the negative terminal 22B satisfy the relationship of x.gtoreq.a/4. Accordingly, even when water droplets 41 adhere to side surfaces S1 and S2 of battery 22 due to high-temperature and high-humidity atmosphere, condensation, or the like, protrusion length x of insulator 23 is equal to or greater than height h of water droplets 41. This can prevent the positive electrode terminal 22A and the negative electrode terminal 22B or the lands 212A and 212B from being connected to each other by the water droplets 41. Therefore, the occurrence of electrolytic corrosion can be suppressed.

Further, since the insulator 23 is also present between the one surface of the substrate 21 and the rear surface of the cell 22, even when the water droplets 41 penetrate into the rear surface of the cell 22, the connection of the water droplets 41 between the positive electrode terminal 22A and the negative electrode terminal 22B, or between the lands 212A and 212B can be suppressed. Therefore, the occurrence of electrolytic corrosion can be suppressed.

[1.4 modified example ]

In the above-described embodiment, the case where the substrate 21 is a single-sided substrate has been described, but the type of substrate is not limited to this, and may be a double-sided substrate, a multilayer substrate, a build-up substrate, or the like. When the substrate 21 is a double-sided substrate, the battery 22 may be provided on both sides, or the battery 22 may be provided on one side.

In the above-described embodiment, the case where the substrate main body 211 is a rigid substrate has been described, but the type of the substrate main body 211 is not limited thereto, and may be a flexible substrate, a rigid-flexible substrate, or the like.

In the above-described embodiment, the case where the substrate 21 is flat was described, but the shape of the substrate 21 is not limited thereto, and the substrate 21 may be curved or bent.

In the above-described embodiment, the case where the exterior material is the exterior case 10 has been described, but the exterior material is not limited thereto, and may be a laminate film or the like.

In the above-described embodiment, the case where the electronic component mounting board 20 includes one battery 22 has been described, but a plurality of batteries 22 may be provided as shown in fig. 8B. The plurality of cells 22 may be arranged in one or two or more rows so that the side surfaces S1 and S2 face each other. In this case, if the electronic component mounting board 20 is viewed from the direction perpendicular to the one surface on which the batteries 22 are mounted, one insulator 23 may be provided to penetrate a plurality of batteries 22 constituting one row as shown in fig. 8B. However, the structure of the insulator 23 is not limited to this, and the substrate 21 may have a plurality of insulators 23 provided corresponding to the plurality of cells 22, respectively.

In the above-described embodiment, the case where the battery 22 is in the form of a thin plate has been described, but the shape of the battery 22 is not limited to this, and may be in the form of a sheet, a block, or the like.

In the above-described embodiment, the case where the main surface of the battery 22 is rectangular was described, but the shape of the main surface of the battery 22 is not limited to this, and may be circular, elliptical, polygonal or irregular other than rectangular, or the like.

In the above-described embodiment, the case where the electronic component is the battery 22 has been described, but the type of the electronic component is not limited to this, and an electronic component having at least two terminals connected to the substrate 21 may be used. Specific examples of the electronic components other than the battery 22 include a capacitor, a resistor, a coil, a diode, a transistor, a switch, and the like, but are not limited to these electronic components.

In the above-described embodiment, the case where both ends of the insulator 23 protrude from both the side surfaces S1 and S2 of the battery 22 has been described, but one end of the insulator 23 may protrude from either the side surface S1 or S2 of the battery 22.

In the above-described embodiment, the case where the insulator 23 is also present between the one surface of the substrate 21 and the back surface of the cell 22 has been described, but the insulator 23 may not be present between the one surface of the substrate 21 and the back surface of the cell 22. However, in order to suppress the occurrence of electrolytic corrosion even when water droplets 41 enter the rear surface of the cell 22, it is preferable that the insulator 23 also exists between the one surface of the substrate 21 and the rear surface of the cell 22 as in the above-described embodiment.

In the above-described embodiment, the case where the insulator 23 has a linear shape has been described, but the shape of the insulator 23 is not limited to this. For example, as shown in fig. 7A, the tip of the insulator 23 protruding from the side surfaces S1 and S2 may be branched into a T shape. As shown in fig. 7B, the tip of the insulator 23 protruding from the side surface S1 may be bent at right angles to form an L-shape, and the tip of the insulator 23 protruding from the side surface S2 may be bent at right angles to form an inverted L-shape. The direction of the distal end of the insulator 23 is not limited to the same direction as shown in fig. 7B, but may be opposite to the direction shown in fig. 8A. The insulator 23 may be thicker or thinner toward the tip. The insulator 23 may have a meandering shape such as a sinusoidal shape or a zigzag shape. When the insulator 23 is formed in the shape as described above, the projection length x of the insulator 23 is a length of a portion extending perpendicularly to the side surfaces S1 and S2.

In addition, as shown in fig. 8B, when the plurality of cells 22 are arranged in a row such that the side surfaces S1 and S2 face each other, the insulator 23 may have a linear extending portion 23A extending in a direction from the positive electrode terminal 22A toward the negative electrode terminal 22B between the cells 22 adjacent to each other in the row direction. In this case, since the water droplets are divided by the extension portion 23A between the side surfaces S1 and S2 of the two adjacent cells 22 in the row direction, the positive electrode terminals 21A or the negative electrode terminals 21B of the adjacent cells 22 can be prevented from being connected to each other by the water droplets. Therefore, when there is a potential difference between the positive electrode terminals 21A or the negative electrode terminals 21B of the two adjacent batteries 22, the occurrence of electrolytic corrosion between the two adjacent batteries 22 can be suppressed. The potential difference between the positive electrode terminals 21A and the negative electrode terminals 21B of the two adjacent batteries 22 may occur not only when the two adjacent batteries 22 have different structures, but also due to factors such as the charge/discharge state and the deterioration state of the two adjacent batteries 22. In addition, the positive electrode terminal 21A and the negative electrode terminal 22B may face each other in two cells 22 adjacent to each other in the column direction. The above-described structure in which the extension portion 23A is provided is particularly effective in the case where the positive electrode terminal 21A and the negative electrode terminal 22B are opposed to each other.

Although the case where the protruding position of insulator 23 is the center position of side surfaces S1 and S2 has been described, the protruding position of insulator 23 may be shifted from the center position of side surfaces S1 and S2 as shown in fig. 9. In this case, the longer distance y of the projection length x of the insulator 23 with respect to the side surfaces S1, S2, the distance y from the first end of the side surfaces S1, S2 to the projection position of the insulator 23, and the distance z from the second end of the side surfaces S1, S2 to the projection position of the insulator 23 satisfies the relationship of x ≧ y/2. Thus, even when water droplets 41 adhere to the side surfaces S1 and S2 of the battery 22 due to a high-temperature and high-humidity atmosphere, dew condensation, or the like, connection of the water droplets 41 between the positive electrode terminal 22A and the negative electrode terminal 22B, or between the lands 212A and 212B can be suppressed. Therefore, the occurrence of electrolytic corrosion can be suppressed.

< 2 application example >

[2.1 wrist-worn electronic device as an application example ]

Hereinafter, an application example in which the present invention is applied to a wrist-worn electronic device will be described.

The wrist-worn electronic device, also called a smart band, can acquire data on the activities of a person, such as the number of steps, the moving distance, the consumed calories, the amount of sleep, the heart rate, and the like, only by being wrapped around the arm. Furthermore, the acquired data can be managed by a smartphone. Further, the mail receiving and sending function may be provided, and the user may be notified of the incoming mail by an LED (light emitting Diode) lamp and/or vibration, for example.

Fig. 10 shows an appearance of the wrist-worn electronic apparatus 1601. The electronic apparatus 1601 is a clock-type wearable apparatus that can be freely attached to and detached from a human body. The electronic apparatus 1601 includes a belt portion 1611 worn on an arm, a display device 1612 for displaying numerals, characters, patterns, and the like, and an operation button 1613. The belt portion 1611 is formed with a plurality of holes 1611a and protrusions 1611b provided on the inner peripheral surface (surface that comes into contact with the arm when the electronic apparatus 1601 is mounted) side.

In the use state of the electronic apparatus 1601, as shown in fig. 10, the band portion 1611 is bent into a substantially circular shape, and the projection 1611b is inserted into the hole 1611a and worn on the arm. By adjusting the position of the hole 1611a of the insertion projection 1611b, the diameter can be adjusted according to the thickness of the arm. When the electronic apparatus 1601 is not in use, the projection 1611b is detached from the hole 1611a, and the tape unit 1611 is stored in a substantially flat state. A sensor (not shown) is provided in the belt portion 1611 over substantially the entire belt portion 1611.

Fig. 11 shows a structure of an electronic apparatus 1601. The electronic apparatus 1601 includes a controller IC1615 as a drive control unit, a sensor 1620, a host device 1616, and a battery unit 1617 as a power source, in addition to the display device 1612. The sensor 1620 may include a controller IC 1615.

The sensor 1620 can detect both pressing and bending. The sensor 1620 detects a change in the capacitance according to the pressing, and outputs an output signal corresponding to the change in the capacitance to the controller IC 1615. The sensor 1620 detects a change in resistance value (resistance change) according to the bending, and outputs an output signal corresponding to the change in resistance value to the controller IC 1615. The controller IC1615 detects pressing and bending of the sensor 1620 based on an output signal from the sensor 1620, and outputs information corresponding to the detection result of the pressing and bending to the host device 1616.

The host device 1616 executes various processes based on the information supplied from the controller IC 1615. For example, processes such as display of character information, image information, and the like on the display device 1612, movement of a cursor displayed on the display device 1612, and scrolling of a screen are executed.

The display device 1612 is, for example, a flexible display device, and displays a screen in accordance with a video signal, a control signal, or the like supplied from the host device 1616. Examples of the display device 1612 include, but are not limited to, a liquid crystal display, an ElectroLuminescence (EL) display, and electronic paper.

The battery unit 1617 is the battery unit according to the above-described embodiment or its modified example. The electronic apparatus 1601 may include the electronic component mounting board 20 in the above-described embodiment or the modification thereof, instead of the battery unit 1617.

The present invention is applicable to various electronic apparatuses including a battery, and is not limited to the wrist-worn electronic apparatus 1601 described in the above application example. Examples of the electronic devices other than the above-described application examples include notebook Personal computers, tablet Personal computers, cellular phones (e.g., smart phones), Personal Digital Assistants (PDA), display devices (LCD, EL displays, electronic paper, etc.), imaging devices (e.g., Digital still cameras, Digital camcorders, etc.), audio devices (e.g., portable audio players), game devices, universal credit cards, sensor network terminals, smartwatches, glasses-type terminals (head mounted displays (HMD), etc.), cordless telephone handsets, electronic books, electronic dictionaries, radios, earphones, navigation systems, memory cards, pacemakers, hearing aids, electric tools, electric shavers, refrigerators, air conditioners, televisions, stereo devices, water heaters, microwave ovens, dishwashers, washing machines, and the like, Dryers, lighting devices, toys, medical devices, robots, load regulators, traffic lights, and the like, but are not limited thereto.

[2.2 hybrid vehicle as application example ]

An example in which the present invention is applied to a vehicle power storage system will be described with reference to fig. 12. Fig. 12 schematically shows the structure of a hybrid vehicle to which the series hybrid system of the present invention is applied. A series hybrid system is a vehicle that runs by an electric power driving force conversion device using electric power generated by a generator driven by an engine or electric power obtained by temporarily storing the electric power in a battery in advance.

This hybrid vehicle 7200 is mounted with an engine 7201, a generator 7202, an electric-power driving-force conversion device 7203, drive wheels 7204a, drive wheels 7204b, wheels 7205a, wheels 7205b, a power storage device 7208, a vehicle control device 7209, various sensors 7210, and a charging port 7211. Power storage device 7208 includes electronic component mounting board 20 according to any one of the above-described embodiments and modifications.

Hybrid vehicle 7200 runs using electric-power drive force conversion device 7203 as a power source. An example of the electric power drive force conversion device 7203 is a motor. The electric power-drive force conversion device 7203 is operated by electric power of the power storage device 7208, and the rotational force of the electric power-drive force conversion device 7203 is transmitted to the drive wheels 7204a and 7204 b. Note that, by using direct current-alternating current (DC-AC) or reverse conversion (AC-DC conversion) where necessary, the electric power drive force conversion device 7203 can be applied to either an alternating current motor or a direct current motor. The various sensors 7210 control the engine speed or the opening degree of a throttle valve (throttle opening degree), not shown, by the vehicle control device 7209. The various sensors 7210 include a speed sensor, an acceleration sensor, an engine speed sensor, and the like.

The rotational force of engine 7201 is transmitted to generator 7202, and electric power generated by generator 7202 using the rotational force can be stored in power storage device 7208.

When the hybrid vehicle is decelerated by a brake mechanism, not shown, resistance at the time of deceleration thereof is applied as rotational force to the electric-drive force conversion device 7203. The regenerative electric power generated by electric power drive force conversion device 7203 using this torque is stored in power storage device 7208.

By connecting power storage device 7208 to an external power supply of the hybrid vehicle, power storage device 7208 can receive electric power from the external power supply via charging port 7211 as an input port and store the received electric power.

Although not shown, an information processing device that performs information processing related to vehicle control based on information related to the secondary battery may be provided. As such an information processing apparatus, for example, there is an information processing apparatus that displays the remaining battery capacity based on information on the remaining battery capacity.

In the above description, a series hybrid vehicle that runs by a motor using electric power generated by a generator driven by an engine or temporarily stored in a battery has been described as an example. However, the present invention can also be effectively applied to a parallel hybrid vehicle that uses both the outputs of the engine and the motor as drive sources and appropriately switches between three modes of running only by the engine, running only by the motor, and running by the engine and the motor. Furthermore, the present invention can also be effectively applied to a so-called electric vehicle that runs only by driving of a drive motor without using an engine.

An example of a hybrid vehicle 7200 to which the technique according to the present invention can be applied is described above. The technique according to the present invention can be suitably applied to power storage device 7208 having the above-described configuration.

[2.3 Electrical storage System as an application example ]

An example in which the present invention is applied to a residential power storage system will be described with reference to fig. 13. For example, in power storage system 9100 for house 9001, electric power is supplied from concentrated power system 9002 such as thermal power generation 9002a, nuclear power generation 9002b, and hydroelectric power generation 9002c to power storage device 9003 via power grid 9009, information grid 9012, smart meter 9007, power hub 9008, and the like. At the same time, power is supplied from an independent power supply such as the in-home power generation device 9004 to the power storage device 9003. The electric power supplied to the power storage device 9003 is stored. Power storage device 9003 is used to supply electric power used in house 9001. The same power storage system can be used for a building as well as for the house 9001.

A power generation device 9004, a power consumption device 9005, a power storage device 9003, a control device 9010 for controlling the devices, a smart meter 9007, and a sensor 9011 for acquiring various information are provided in the house 9001. Each device is connected to the information network 9012 through the power grid 9009. As the power generation device 9004, power generated by a solar cell, a fuel cell, or the like is supplied to the power consumption device 9005 and/or the power storage device 9003. The power consuming devices 9005 include a refrigerator 9005a, an air conditioner 9005b, a television 9005c, a bathroom 9005d, and the like. Further, the power consumption device 9005 includes an electric vehicle 9006. The electric vehicle 9006 includes an electric vehicle 9006a, a hybrid vehicle 9006b, and an electric motorcycle 9006 c.

The power storage device 9003 includes the electronic component mounting board 20 according to any one of the above-described embodiment and the modifications thereof. The smart meter 9007 has a function of measuring a usage amount of commercial power and transmitting the measured usage amount to a power company. The power grid 9009 can be any one or combination of dc, ac, and contactless power.

The various sensors 9011 are, for example, a human sensor, an illuminance sensor, an object detection sensor, a power consumption sensor, a vibration sensor, a contact sensor, a temperature sensor, an infrared sensor, and the like. Information acquired by the various sensors 9011 is transmitted to the control device 9010. The power consumption device 9005 can be automatically controlled to minimize energy consumption by grasping weather conditions, human conditions, and the like from the information from the sensor 9011. Further, control device 9010 can transmit information about house 9001 to an external power company or the like via the internet.

The power line branching, dc/ac conversion, and other processes are performed by the power hub 9008. As a communication method of the information network 9012 connected to the control device 9010, there are: a method using a communication interface such as UART (universal asynchronous receiver-transmitter: a transceiving circuit for asynchronous serial communication); a method of using a sensor network based on wireless communication standards such as Bluetooth (registered trademark), ZigBee, and Wi-Fi. The Bluetooth (registered trademark) system is applied to multimedia communication and can perform one-to-many communication. ZigBee (registered trademark) uses the physical layer of IEEE (institute of electrical and electronics engineers) 802.15.4. Ieee802.15.4 is the name of a short-range wireless network standard called PAN (personal area network) or W (wireless) PAN.

The control device 9010 is connected to an external server 9013. The server 9013 may be managed by any one of the house 9001, the electric power company, and the service provider. The information transmitted and received by the server 9013 is, for example, power consumption information, life pattern information, electricity charges, weather information, natural disaster information, and information on power transactions. These pieces of information may be transmitted and received by a consumer (e.g., a television) at home, or may be transmitted and received by a device (e.g., a mobile phone) outside the home. Such information can be displayed on a device having a display function such as a television, a portable telephone, a PDA (personal digital assistant), or the like.

The control device 9010 for controlling each unit is configured by a CPU (central processing unit), a RAM (random access memory), a ROM (read only memory), and the like, and is accommodated in the power storage device 9003 in this example. The control device 9010 is connected to the power storage device 9003, the home power generation device 9004, the power consumption device 9005, various sensors 9011, and the server 9013 via the information network 9012, and has a function of adjusting the amount of commercial power and the amount of power generation, for example. In addition, the electric power market may also have a function of performing electric power trading.

As described above, not only can electric power be stored in the power storage device 9003 from the centralized power system 9002 such as the thermal power generation 9002a, the nuclear power generation 9002b, and the hydroelectric power generation 9002c, but also generated electric power of the in-home power generation device 9004 (solar power generation, wind power generation) can be stored in the power storage device 9003. Therefore, even if the generated power of the in-home power generator 9004 varies, control such as making the amount of power sent to the outside constant or discharging as needed can be performed. For example, the following usage also occurs: the electric power obtained by solar power generation is stored in the electric storage device 9003, the midnight electric power with low electricity rate is stored in the electric storage device 9003 at night, and the electric power stored in the electric storage device 9003 is discharged and used in a time zone with high electricity rate in the daytime.

Note that although the example in which the control device 9010 is housed in the power storage device 9003 has been described in this example, the control device 9010 may be housed in the smart meter 9007 or may be configured separately. Further, power storage system 9100 may be used for a plurality of households in a collective housing, or power storage system 9100 may be used for a plurality of individual houses.

Although the embodiment of the present invention and the modification thereof have been specifically described above, the present invention is not limited to the embodiment and the modification thereof described above, and various modifications can be made based on the technical idea of the present invention.

For example, the configurations, methods, steps, shapes, materials, numerical values, and the like recited in the above-described embodiments and modifications thereof are merely examples, and configurations, methods, steps, shapes, materials, numerical values, and the like different from those described above may be used as necessary.

The configurations, methods, steps, shapes, materials, numerical values, and the like of the above-described embodiments and modifications thereof can be combined with each other without departing from the gist of the present invention.

Description of the reference numerals

10 outer case

11 casing body

11A hole part

12 cover part

20 electronic component mounting board

21 printed circuit board

22 Battery (electronic parts)

22A Positive terminal (first terminal)

22B negative terminal (second terminal)

23 insulation

23A extended part

24A, 24B solder

Solder paste before 24C, 24D reflow

25A positive terminal

25B negative terminal

26 control part

27 Charge and discharge FET

27A charge control FET

27B discharge control FET

27C, 27D parasitic diode

30 cable connector

31 Cable

32 connector

41 Water drop

211 substrate body

212A, 212B pads (first and second substrate terminals)

213 resist layer

221 Positive electrode layer

221A positive electrode current collector

221B positive electrode active material layer

222M and 222N negative electrode layer

222A negative electrode collector

222B negative electrode active material layer

223 solid electrolyte

1601 wrist strap type electronic equipment

7200 hybrid vehicle

9100 electric power storage system

S1, S2 side (peripheral part)

220SA, 220SB end face