JP2013048510A - Battery device and operation method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety of a battery device by forcing the battery to discharge when electric power remains in a used thin battery.SOLUTION: The battery device comprises a thin battery including: a sheet-like electrode group comprising a first electrode, a second electrode and an electrolyte intercalated between the first electrode and the second electrode; and an exterior body for sealing and housing the electrode group, and has a compulsive discharge operation switch for switching states between a state in which the first electrode and the second electrode are in an external short circuit and a state in which the first electrode and the second electrode are not in the external short circuit.

Description

  The present invention relates to a battery device including a thin battery including a sheet-like electrode group and an exterior body that hermetically stores the electrode group, and an operation method thereof.

  In recent years, thin batteries have been used as power sources for small electronic devices such as mobile phones, audio recording / playback devices, watches, video and still image cameras, liquid crystal displays, calculators, IC cards, temperature sensors, hearing aids, and pressure-sensitive buzzers. It is used.

  Thin batteries are also used in devices that operate in contact with a living body (biological adhesive apparatus). As such a device, an iontophoresis transdermal drug delivery device or the like has been developed that supplies a drug into the body through a living skin when a predetermined potential is applied. Also, a measurement circuit that measures biological information such as body temperature, blood pressure, and pulse, a monitoring unit that checks the measured biological information, and radio transmission that transmits radio signals related to the biological information to facilities such as hospitals and fire fighters A sheet-like biological information measurement and transmission device including a circuit has been developed. When biometric information indicating a change in the health of the user is obtained, the biometric information is automatically transmitted to a hospital or the like.

  With the further miniaturization of the above-described small electronic devices and devices, there is a demand for further thinning of thin batteries. In response to such a demand, a thin battery using a thin and flexible laminate film for an exterior body has been studied (Patent Document 1). The laminate film is composed of a metal foil and resin layers formed on both sides thereof. In such a thin battery, a sheet-like electrode group including a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode is housed in an outer package made of a bag-like laminate film. In general, a pair of leads are connected to the electrode group, and a part of them is exposed to the outside as an external terminal from the sealing portion of the exterior body.

  It has also been proposed to use a thin battery package made of a resin base film and a flexible inorganic material layer instead of an outer package made of a laminate film (Patent Document 2). By using silicon nitride, aluminum nitride, or the like for the inorganic material layer, it is possible to provide a package having relatively high sealing performance at low cost.

JP 2000-258881 A JP-A-6-231739

  A thin battery is rich in flexibility. On the other hand, it is necessary to consider the possibility of damage to the exterior body because it is less resistant to external impacts than a cylindrical or square battery. For example, the user's handling of the used battery tends to be messy. Further, when an electronic device driven by a thin battery is a biological sticking device such as an iontophoresis transdermal administration device, the electronic device is generally discarded after use. In such a case, the thin battery is also discarded together with the electronic device.

  There is a possibility that a large external force that is not assumed in a normal use state is applied to a thin battery that is handled randomly or discarded after use. At this time, if power remains in the battery, an unexpected short circuit current may flow or the battery may generate heat, which is inconvenient in terms of safety.

  In view of the above, one aspect of the present invention provides a sheet-like electrode group including a first electrode, a second electrode, and an electrolyte layer interposed between the first electrode and the second electrode, and the electrode group. A state in which the first electrode and the second electrode are externally short-circuited, and the first electrode and the second electrode are not externally short-circuited. The battery device has a forced discharge operation switch for switching between.

  According to another aspect of the present invention, a sheet-like electrode group including a first electrode, a second electrode, and an electrolyte layer interposed between the first electrode and the second electrode, and the electrode group are hermetically stored. A state in which the first electrode and the second electrode are externally short-circuited, and the first electrode and the second electrode are not externally short-circuited. An operation method of a battery device having a forced discharge operation switch for switching, wherein the battery is maintained in a state in which the first electrode and the second electrode are not externally short-circuited during normal discharge of the battery. After the normal discharge, the forced discharge operation switch switches the state where the first electrode and the second electrode are not externally short-circuited to the state where the first electrode and the second electrode are externally short-circuited. , Forcibly discharging the battery, to the operation method To.

  When power remains in the used battery by switching from the state where the first electrode and the second electrode in the battery are not externally short-circuited to the externally short-circuited state by operating the forced discharge operation switch The battery can be forcibly discharged. Thereby, the safety | security of a battery device improves.

It is a perspective view which shows an example of the battery device which comprises a biological information measuring device. It is a perspective view which shows an example of the external appearance of the deformed device. It is a top view which shows notionally an example of an iontophoresis percutaneous administration apparatus. FIG. 4 is a schematic sectional view taken along line IV-IV of the iontophoretic transdermal administration device. It is sectional drawing corresponding to FIG. 4A of an example of the battery device which integrated the thin battery in the iontophoresis transdermal administration device. It is a circuit diagram of the battery device which concerns on one Embodiment of this invention. It is an example of the circuit diagram of a 1st circuit in case a load is an iontophoresis transdermal administration device. It is a figure which shows an example of the battery device provided with a forced discharge operation switch, and the procedure at the time of forcedly discharging it. It is a top view which shows an example of the battery which comprises a forced discharge operation switch. It is a schematic sectional drawing which shows the operation | movement from the state (a) in which the 1st SW terminal and 2nd SW terminal of an example of the pushbutton type forced discharge operation switch separated were contacted. It is a schematic sectional drawing of the thin battery which concerns on one Embodiment of this invention. It is a top view of the thin battery which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the thin battery which concerns on other embodiment of this invention. It is sectional drawing of the laminate film which forms the exterior body which concerns on one Embodiment of this invention.

  The battery device of the present invention includes a sheet-like electrode group comprising a first electrode, a second electrode, and an electrolyte layer interposed between the first electrode and the second electrode, an exterior body for hermetically storing the electrode group, Including a thin battery. Further, the battery device of the present invention includes a forced discharge operation switch for switching between a state where the first electrode and the second electrode are externally short-circuited and a state where the first electrode and the second electrode are not externally short-circuited. Have.

  During normal discharge of the battery, the state in which the first electrode and the second electrode are not short-circuited externally is maintained. On the other hand, after the battery is normally discharged, it is possible to switch from the state where the first electrode and the second electrode are not externally short-circuited to the state where the first electrode and the second electrode are externally short-circuited by a forced discharge operation switch. It is. In a state where the first electrode and the second electrode are externally short-circuited, the battery is forcibly discharged.

  That is, after the battery is normally discharged, the connection between the first electrode and the second electrode is switched from the open state to the closed state by the forced discharge operation switch. Here, the open state is a state in which an external short circuit is not formed between the first electrode and the second electrode. The closed state is a state in which an external short circuit is formed between the first electrode and the second electrode. The normal discharge is a state where electric power necessary for driving the electronic device is supplied.

  In a preferred aspect of the present invention, the forced discharge operation switch includes a first SW terminal for forming a short circuit electrically connected to the first electrode, and a second SW terminal for forming a short circuit electrically connected to the second electrode. Are provided. In this case, when the first SW terminal and the second SW terminal are switched from the electrically non-connected state to the connected state, the first electrode and the second electrode are externally short-circuited, and the battery is forcibly discharged. Is done.

  The battery device of the present invention may include an electronic device driven by power supply from a thin battery. In this case, it is preferable that the thin battery and the electronic device are integrated into a sheet. Examples of such an electronic device include a biological sticking type device such as a biological information measuring device and an iontophoresis transdermal dosage device. Hereinafter, a sheet-like article in which a thin battery and an electronic device are integrated is also referred to as a battery-electronic device assembly. The sheet-like battery-electronic device assembly itself is configured to have flexibility.

  The bio-applied device is also referred to as a wearable portable terminal, and is used in a state of being in close contact with a living body, and therefore is required to have a degree of flexibility that does not cause discomfort even if it is in close contact with the skin for a long time. Therefore, excellent flexibility is also required for the power source for driving the bio-applied device. Thin batteries are useful as power sources for such devices. Moreover, the living body sticking type | mold apparatus is convenient for the disposable type discarded after use. Therefore, the bio-applied device is also suitable for use as a battery device having a forced discharge operation switch.

  The biological information measuring device is developed in the medical field for the purpose of a doctor or the like monitoring biological information of a patient or the like. The biological information measuring device constantly measures biological information such as blood pressure, body temperature, and pulse while in contact with the skin of the living body. The measured information is wirelessly transmitted to the monitor.

  An iontophoretic transdermal drug delivery device is a device that supplies a drug into the body through the outer skin when a predetermined potential is applied. The iontophoresis transdermal administration device has a pair of electrodes facing a living body. Therefore, when the electronic device is an iontophoresis transdermal administration device, one of the pair of electrodes may be formed integrally with the first SW terminal, and the other of the pair of electrodes may be formed integrally with the second SW terminal. . By maintaining the power supply of the electronic device in the ON state even after the electronic device is used, the pair of electrodes facing the living body are respectively connected to the first electrode and the second electrode of the thin battery as the power supply. Because it is. In this case, when the pair of electrodes of the electronic device is short-circuited, the first electrode and the second electrode of the battery are also short-circuited.

FIG. 1 is a perspective view showing an example of a battery-electronic device assembly (battery device) including a biological information measuring device. FIG. 2 shows an example of the appearance when the device is deformed.
The biological information measuring device 40 includes a sheet-like holding member 41 that holds the constituent elements. The holding member 41 is made of a flexible material, and the temperature sensor 43, the pressure sensitive element 45, the storage unit 46, the information transmission unit 47, the button switch SW1, and the control unit 48 are embedded in a region from the inside to the surface. It is. The thin battery 21 is accommodated in a flat space provided inside the holding member 41. That is, the battery 21 and the biological information measuring device 40 are integrated into a sheet, and constitute a battery-electronic device assembly 42.

  For example, an insulating resin material can be used for the holding member 41. By applying, for example, an adhesive 49 having adhesive strength to one main surface of the battery-electronic device assembly, the biological information measuring device 40 can be wound around the wrist, ankle, neck, or the like of the user.

  The temperature sensor 43 is configured using a thermal element such as a thermistor or a thermocouple, for example, and outputs a signal indicating the user's body temperature to the control unit 48. The pressure sensitive element 45 outputs a signal indicating the user's blood pressure and pulse to the control unit 48. For example, a nonvolatile memory can be used as the storage unit 46 that stores information corresponding to the output signal. The information transmission unit 47 converts necessary information into a radio wave according to a signal from the control unit 48 and radiates it. The switch SW1 is used when the biological information measuring device 40 is switched on and off. The temperature sensor 43, the pressure sensitive element 45, the storage unit 46, the information transmission unit 47, the switch SW1 and the control unit 48 are attached to, for example, a flexible substrate and are electrically connected by a wiring pattern formed on the substrate surface. .

  The control unit 48 includes a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a ROM (Read Only Memory) that stores a control program for the device, and a RAM (Random Access Memory) that temporarily stores data. These peripheral circuits are provided, and the operation of each part of the biological information measuring device 40 is controlled by executing a control program stored in the ROM.

FIG. 3 is a top view conceptually showing an example of an iontophoretic transdermal administration device, and FIG. 4A is a schematic sectional view of the device. 4A corresponds to a cross-sectional view taken along line IV-IV in FIG. 4B is a cross-sectional view corresponding to FIG. 4A of an example of a battery device in which the thin battery 101 is integrated with the apparatus.
The iontophoresis transdermal administration device 40A includes a sheet-like holding member 111 that holds the constituent elements. The holding member 111 is made of a flexible material. Inside the holding member 111, there are a semiconductor element 112 for controlling the power from the thin battery, a pair of flat electrodes 113, 114, and a pair of reservoirs 113a, 114a facing the pair of electrodes 113, 114, respectively. Buried. The reservoirs 113a and 114a are both made of a gel material that can be energized. An ionic drug is sealed in either one of the reservoirs 113a and 114a. The semiconductor element 112 is an element having a rectifying action such as a constant current diode, for example, and has an anode connected to the negative terminal of the battery 101 and a cathode connected to one of the electrodes 113 and 114. The reservoirs 113a and 114a are directly attached to the skin of a living body such as a human body. The other of the electrodes 113 and 114 is connected to the positive terminal of the battery 101.

  When a voltage is applied between the pair of electrodes, the ionic drug sealed in either of the reservoirs 113a and 114a is accelerated by the electric field between the electrodes and penetrates into the subcutaneous tissue. The penetrability of the drug from the skin is controlled by the semiconductor element 112.

  In a preferred aspect of the present invention, the battery device is provided with the first SW terminal and the second SW terminal so that the first SW terminal and the second SW terminal can be connected by bending the battery device. With such a structure, forced discharge of the battery can be started only by a simple operation of bending the used battery device at the bending position. A crease or a perforation can be provided in advance at the folding position of the battery device.

  When the first SW terminal and the second SW terminal can be connected by bending the battery device, the bending of the battery device is fixed in the bent state (the first SW terminal and the second SW terminal are connected). Is preferred. Thereby, since the forced discharge is maintained at least for a certain period, the forced discharge can be prevented from stopping in a short period. The means for fixing the battery device in a folded state is not particularly limited, and an adhesive, Velcro (registered trademark), various engaging members, and the like can be used.

  When the first electrode and the second electrode are externally short-circuited, a relatively large current continues to flow between the first electrode and the second electrode. At that time, it is desirable to provide a resistor in the formed external short circuit as necessary so that a too large current does not flow. The external short circuit formed when the first electrode and the second electrode are externally short-circuited has, for example, a resistance of 1 kΩ or more, preferably 1 kΩ to 1000 kΩ connected in series to the first electrode and the second electrode. It is preferable to provide.

  The thickness of the thin battery is not particularly limited, but considering flexibility, it is preferably 1 mm or less, and more preferably 0.7 mm or less. The thickness of the sheet-like battery-electronic device assembly (battery device) may be slightly thicker than that of the thin battery, but is preferably 1 mm or less from the same viewpoint. However, if the thickness of each of the thin battery and the battery-electronic device assembly is about 5 mm or less, relatively good flexibility may be obtained. In addition, since it is technically difficult to make these thickness less than 50 micrometers, the minimum of thickness is 50 micrometers.

  It is desirable that the thin battery is rich in flexibility. The flexibility of the battery is influenced by the elastic modulus of the electrode group and the outer package. In particular, in the case of a battery having a thickness of 1 mm or less, the elasticity of the exterior body greatly affects the flexibility of the battery. From the viewpoint of flexibility, the smaller the elastic modulus of the outer package is, the better. However, in order to maintain the function as an exterior body, a certain amount of strength is required. From the viewpoint of achieving both flexibility and strength, the tensile modulus of the outer package is preferably, for example, 10 to 700 MPa.

  The battery electrode group may deteriorate when exposed to outside air (particularly water vapor). Therefore, it is desirable that the exterior body for hermetically storing the electrode group has a barrier property against water vapor. As such a sheet-like material, for example, a laminate film including a water vapor barrier layer and resin layers formed on both sides thereof is known. By using an exterior body having a barrier layer, the influence of outside air on the battery (the influence of water vapor on the power generation element of the battery) can be effectively reduced. The thickness of the barrier layer is preferably 35 μm or less from the viewpoint of ensuring the flexibility of the exterior body.

  The structure of the electrode group is not particularly limited, but an electrode suitable for forming a sheet is used. For example, in the electrode group, the first electrode includes a first current collector sheet and a first active material layer attached to the surface thereof, and the second electrode includes a second current collector sheet and a second current material attached to the surface thereof. The active material layer is included, the electrolyte layer includes a non-aqueous electrolyte, and is interposed between the first active material layer and the second active material layer.

  In a preferred embodiment, the electrode group includes a first electrode including a first current collector sheet and a first active material layer attached to one surface thereof, a second current collector sheet and a second electrode attached to one surface thereof. A second electrode including an active material layer; and an electrolyte layer interposed between the first active material layer and the second active material layer. The other surface of the first current collector sheet and the other surface of the second current collector sheet are in contact with the inner surface of the exterior body, respectively.

  Such an electrode group basically has a structure in which one first electrode and one second electrode are bonded together, that is, a three-layer structure including a first electrode, an electrolyte layer, and a second electrode. (Or, a five-layer structure comprising a first current collector sheet, a first active material layer, an electrolyte layer, a second active material layer, and a second current collector sheet). However, the present invention does not exclude a thin battery including an electrode group including at least one first electrode and at least one second electrode between the first electrode and the second electrode at both ends.

  In another preferred embodiment, the electrode group is attached to the pair of first electrode, the second current collector sheet, and both surfaces thereof, including the first current collector sheet and the first active material layer attached to one surface thereof. A second electrode including the second active material layer, and an electrolyte layer interposed between the first active material layer and the second active material layer. And the other surface of a pair of 1st electrical power collector sheet | seat is in contact with the inner surface of an exterior body, respectively.

  Such an electrode group basically has a structure in which one second electrode is sandwiched between a pair of first electrodes, that is, a pair of first electrodes on the outermost layer, a second electrode on the inner layer, and a first electrode It has a five-layer structure composed of two electrolyte layers interposed between the electrode and the second electrode. However, the present invention does not exclude a thin battery including an electrode group having a structure exceeding five layers including at least one additional first electrode and at least one additional second electrode. Further, in some cases, it does not exclude a thin battery having an electrode group in which one first electrode and one second electrode are overlapped and wound into a flat shape.

Next, a battery device according to an embodiment of the present invention will be described.
When the battery device is discarded after use, if power remains in the battery, it is desirable to forcibly discharge the battery within a short period before or after disposal. Therefore, the battery device is provided with a forced discharge operation switch for switching from a state in which the first electrode and the second electrode are not externally short-circuited to a state in which the battery is externally short-circuited after use.

  As shown in FIG. 5, the battery device (battery-electronic device assembly) 100 usually includes a battery 101, an electronic device (load) 102, and a circuit (first circuit) that connects these in series. Circuit) 110. The first circuit 110 is converted from the open state to the closed state by the first switch 103. When the load 102 is the biological information measuring device shown in FIGS. 1 and 2, the switch SW <b> 1 corresponds to the first switch 103.

  FIG. 6 is an example of a circuit diagram of the first circuit when the load 102 is an iontophoretic transdermal administration device. By switching the first switch 103 from the open state to the closed state, the battery 101, the constant current circuit 112 of the dosing device, and the pair of electrodes 113 and 114 of the dosing device are connected in series. A resistance R between the pair of electrodes 113 and 114 indicates a resistance between reservoirs made of a gel material affixed to the skin of a living body.

  In the case of FIG. 5, in addition to the first circuit 110, a second circuit 120 including a first electrode of the battery, a second electrode, a resistor 105, and respective paths connecting them in series is provided. The second circuit 120 is converted from an open state to a closed state by a forced discharge operation switch (second switch) 104. When the forced discharge operation switch 104 includes a first SW terminal connected to the first electrode via the first path and a second SW terminal connected to the second electrode via the second path, the first SW terminal An external short circuit is formed by connecting the second SW terminal.

  A person who has finished using the battery device converts the forced discharge operation switch from the open state to the closed state (connects the first SW terminal and the second SW terminal), so that the positive electrode and the negative electrode of the battery 101 have only the resistor 105. Via an external short circuit. As a result, a relatively large current continues to flow through the second circuit 120, and the battery reaches a fully discharged state within a short period of time. The resistor 105 is connected in series with the battery 101 as necessary so that a large current does not flow through the second circuit. However, when there is no fear that a large current flows through the second circuit, for example, when a sufficient resistance already exists due to the contact state of the second switch or the path connecting the positive electrode and the negative electrode, the resistor 105 is further added. There is no need to connect.

  Since the battery device is excellent in flexibility, it can be easily physically deformed. Therefore, the forced discharge operation switch 104 may be changed from an open state to a closed state by applying physical deformation to the battery device. In this case, the first SW terminal and the second SW terminal that are separated from each other before the physical deformation is applied are in contact with each other in the state after the deformation.

Next, a specific configuration of the forced discharge operation switch (second switch) will be described with reference to FIG.
The battery device 42B of FIG. 7A has a rectangular shape, and the first SW terminal 104x connected to the first electrode of the battery 21 via the first path near both ends of one side along the longitudinal direction. And a second SW terminal 104y connected to the second electrode of the battery 21 via the second path. The battery device 42B is, for example, an iontophoresis transdermal administration device 40A integrated with the thin battery 21.

  The first SW terminal 104x and the second SW terminal 104y are arranged to face each other when the battery device 42B is bent at a predetermined bending position (broken line X). A crease or a perforation can be provided in advance along the broken line X at the folding position. Since the battery device 42B has a thin sheet shape, a person who has finished using the battery device 42B can easily bend it. That is, as shown in FIGS. 7B and 7C, the first SW terminal 104x and the second SW terminal 104y come into contact with each other by the operation of bending the battery device 42B, and an external short circuit including the battery 21 is formed.

  As shown in FIG. 7C, the folded battery device 42B desirably maintains the state where the first SW terminal 104x and the second SW terminal 104y are in contact for at least a while. Therefore, it is preferable that the battery device 42B includes a fixing unit that can fix the first SW terminal 104x and the second SW terminal 104y in contact with each other. In response to such a request, for example, an adhesive, Velcro (registered trademark), various engaging members, etc. are applied to the surface of the battery device 42B on the side where the first SW terminal 104x and the second SW terminal 104y are exposed. It is desirable to do. The adhesive can also be used for attaching the battery device 42B to a living body. Alternatively, one of the first SW terminal 104x and the second SW terminal 104y may be formed in a concave shape, and the other may be formed in a convex shape, and both may be engaged with each other.

  The form of the first SW terminal and the second SW terminal is not particularly limited. For example, the area of the first SW terminal and the second SW terminal may be increased in order to ensure reliable contact between the first SW terminal and the second SW terminal. In the case of an iontophoretic transdermal administration device, the reservoirs 113a and 113b may be the first SW terminal and the second SW terminal, respectively. Moreover, you may form not only a battery device but the 1st SW terminal and 2nd SW terminal which comprise a forced discharge operation switch in battery itself.

  In the thin battery 21B shown in FIG. 8, a forced discharge operation switch is provided on the battery itself. The negative electrode lead 3A and the positive electrode lead 6A are led out from two opposite sides of the rectangular battery. The leads 3A and 6A have internal lead portions 3a and 6a covered with sealing materials 10A and 10B in addition to the portions exposed to the outside. The internal lead portions 3a and 6a are respectively connected to the first SW terminal 23 and the second SW terminal 24 exposed to the outside constituting the forced discharge operation switch. The areas of the first SW terminal 23 and the second SW terminal 24 are both 1 to 20% of the area surrounded by the outline of the battery. When the battery 21B is folded in half along the broken line Y, the first SW terminal 23 and the second SW terminal 24 are almost certainly in contact with each other. Further, the surface of the battery 21B where the first SW terminal 23 and the second SW terminal 24 are exposed is provided with an adhesive 25 over almost the entire surface except for the terminal surface. The state in which the second SW terminal 24 is in contact is maintained.

  The leads 3A and 6A are used as external terminals of the battery, and these are compatible with the internal lead portions 3a and 6a (first SW terminal 23 and second SW terminal 24). That is, the leads 3A and 6A are appropriately shaped and used as the SW terminals of the forced discharge operation switch, and the first SW terminal 23 and the second SW terminal 24 are used as external terminals of the battery (power supply terminals connected to electronic devices). May be used.

  Although the fold or perforation may be provided at the folding position of the battery device, the folding position may be designed to be more flexible than other parts of the battery device. For example, you may design so that the tensile elasticity modulus of a bending position may become smaller than another part. Or you may make the width | variety of a bending position narrower than another part.

  The forced discharge operation switch does not need to be converted from an open state to a closed state when the battery device is bent. For example, a push button type switch may be used. Moreover, the forced discharge operation switch may not operate according to the physical deformation of the battery device. For example, when the battery device is peeled off from the state where it is attached to the living body, the use end may be automatically detected, and the forced discharge operation switch may be controlled to be controlled by the control circuit. Such a control circuit may be incorporated in an electronic device.

  FIG. 9 shows an example of a push button switch. In FIG. 9, the first SW terminal 23A has a cylindrical shape having an annular throttle portion (small diameter portion) 27, and the second SW terminal 24A disposed opposite to the first SW terminal 23A has a flat shape. As shown in FIG. 9 (a), at the peripheral edge portion of the second SW terminal 24A, the first SW terminal 23A and the second SW terminal 24A are separated from each other, and the flange portion 28 is engaged with the throttle portion 27 of the first SW terminal 23A. An insulative spacer 26 is attached. Before and during use of the battery device, the first SW terminal 23A and the second SW terminal 24A are separated (state (a)), and after the use, the first SW terminal 23A is pushed toward the second SW terminal 24A. As shown in FIG. 9B, the flange portion 28 is engaged with the throttle portion 27, and the first SW terminal 23A and the second SW terminal 24A are fixed in contact with each other. The first SW terminal 23A is connected to, for example, a part of the lead piece 3b that is connected to the first electrode of the battery and led to the outside. Similarly, the second SW terminal 24A is connected to a part of the lead piece 6b that is connected to the second electrode of the battery and led out to the outside.

  The means for forcibly discharging the battery is not limited to the second circuit as shown in FIG. When the sheeted electronic device has a pair of electrodes connected to the positive electrode and the negative electrode of the battery at symmetrical positions on the main flat surface, the pair of electrodes are brought into contact by physical deformation such as bending. It is good also as a structure. For example, when the electronic device is an iontophoresis transdermal administration device, one of the pair of electrodes may be formed integrally with the first SW terminal, and the other of the pair of electrodes may be formed integrally with the second SW terminal. .

Next, a thin battery according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 10 is a schematic cross-sectional view of the thin battery 21. FIG. 11 is a top view of the battery 21. FIG. 10 corresponds to a cross-sectional view taken along line XX in FIG. The battery 21 includes an electrode group 13 and an exterior body 8 that houses the electrode group 13. The electrode group 13 includes a negative electrode 11, a positive electrode 12, and an electrolyte layer 7 interposed between the negative electrode 11 and the positive electrode 12. The negative electrode 11 has a negative electrode current collector sheet 1 and a negative electrode active material layer 2 attached to one surface of the negative electrode current collector sheet 1. The positive electrode 12 has a positive electrode current collector sheet 4 and a positive electrode active material layer 5 attached to one surface of the positive electrode current collector sheet 4. The negative electrode 11 and the positive electrode 12 are disposed so that the positive electrode active material layer 5 and the negative electrode active material layer 2 face each other with the electrolyte layer 7 interposed therebetween. A negative electrode lead 3 is connected to the negative electrode current collector sheet 1, and a positive electrode lead 6 is connected to the positive electrode current collector sheet 4. A part of the negative electrode lead 3 and the positive electrode lead 6 is exposed to the outside from the exterior body 8, and the exposed portions function as a negative electrode external terminal and a positive electrode external terminal.

  The exterior body 8 is formed of, for example, a laminate film including a barrier layer and resin layers formed on both sides thereof. The method for forming the laminate film on the outer package is not particularly limited. For example, when the laminate film has an area larger than the rectangular area when two electrode groups 13 are arranged along a plane, the laminate film is folded back at the center line, and the two opposing sides connected by the center line A bag-shaped exterior body is obtained by adhering the peripheral edges of the two. On the other hand, if the laminate film is folded back at the center line, both ends of the laminate film are overlapped, and then the ends are welded together, a cylindrical outer package is obtained.

  A metal film, a metal foil, or the like is used for the negative electrode current collector sheet 1. The negative electrode current collector sheet 1 preferably does not form an alloy with the negative electrode active material and is excellent in electronic conductivity. Therefore, the negative electrode current collector sheet 1 is preferably at least one foil selected from the group consisting of copper, nickel, titanium, alloys thereof, and stainless steel. The thickness of the negative electrode current collector sheet 1 is preferably 5 to 30 μm, for example. By setting the thickness of the negative electrode current collector sheet 1 to 5 μm or more, the negative electrode current collector sheet 1 can maintain excellent strength. By setting the thickness of the negative electrode current collector sheet 1 to 30 μm or less, higher flexibility can be imparted to the negative electrode current collector sheet 1, and it is difficult for large stress to be generated in the negative electrode current collector sheet 1 when bent. Become.

  The negative electrode active material layer 2 may be a mixture layer containing a negative electrode active material, a binder and, if necessary, a conductive agent, a deposited film formed by a vapor phase method such as vapor deposition, or a metal sheet. Examples of the negative electrode active material included in the mixture layer include carbon materials (for example, graphite), silicon alloys, and silicon oxides. Examples of the deposited film include a silicon alloy film and a silicon oxide film. As the metal sheet, a sheet-like lithium metal or lithium alloy can be used. The thickness of the negative electrode active material layer is preferably 1 to 300 μm, for example.

  In addition, when the negative electrode active material layer 2 contains metallic lithium or a lithium alloy, it is particularly desirable to incorporate the forced discharge switch into a battery or a battery device from the viewpoint of improving safety. From the viewpoint of increasing the adhesion with the negative electrode current collector sheet 1, the thickness of the sheet-like lithium metal or lithium alloy is preferably 10 to 100 μm. By making the thickness 100 μm or less, the negative electrode active material layer 2 can maintain excellent flexibility, and peeling of the negative electrode active material layer 2 from the negative electrode current collector sheet 1 is highly suppressed when the battery is bent. The By setting the thickness of the negative electrode active material layer 2 to 10 μm or more, it becomes easy to obtain a battery having a high energy density. Here, the thickness of the negative electrode active material layer 2 is a thickness in an undischarged state or a charged state.

  As the lithium alloy, for example, a Li—Si alloy, a Li—Sn alloy, a Li—Al alloy, a Li—Ga alloy, a Li—Mg alloy, or a Li—In alloy is used. From the viewpoint of securing the negative electrode capacity, the proportion of elements other than Li in the lithium alloy is preferably 0.1 to 10% by weight. The negative electrode current collector sheet 1 is pressure-bonded with lithium metal or a lithium alloy, and the negative electrode current collector sheet 1 and the lithium metal or lithium alloy are brought into close contact with each other, whereby the negative electrode 11 is obtained.

  For the positive electrode current collector sheet 4, a metal material such as a metal film, a metal foil, or a metal fiber nonwoven fabric is used. The positive electrode current collector sheet is preferably at least one foil selected from the group consisting of, for example, silver, nickel, palladium, gold, platinum, aluminum, alloys thereof, and stainless steel. The thickness of the positive electrode current collector sheet is preferably 1 to 30 μm, for example.

  The positive electrode active material layer 5 may be a mixture layer containing a positive electrode active material, a binder, and, if necessary, a conductive agent, or may be a deposited film formed by a vapor phase method such as vapor deposition. The positive electrode active material is not particularly limited. For example, at least one selected from the group consisting of manganese dioxide, carbon fluoride (fluorinated graphite), lithium-containing composite oxide, metal sulfide, and organic sulfur compound is used. it can. The thickness of the positive electrode active material layer is preferably 1 to 300 μm, for example. Since the mixture layer has good flexibility, it can sufficiently follow the deformation of the positive electrode current collector sheet when the battery is bent.

As the positive electrode active material of the primary battery, fluorinated graphite represented by (CF _w ) _m (wherein m is an integer of 1 or more and 0 <w ≦ 1) or manganese dioxide is suitable. Examples of the positive electrode active material of the secondary battery include lithium-containing composite oxides such as Li _xa CoO ₂ , Li _xa NiO ₂ , Li _xa MnO ₂ , Li _xa Co _y Ni _1-y O ₂ , and Li _xa Co _y M _{1. -y O z, Li xa Ni 1} -y M y O z, such as _{Li xb Mn 2 O 4, Li} xb Mn 2-y M y O 4 is suitable. Here, M is at least one element selected from the group consisting of Na, Mg, Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb and B, and xa = 0 to 1.2, xb = 0 to 2, y = 0 to 0.9, and z = 2 to 2.3. xa and xb are values before the start of charging / discharging, and increase / decrease by charging / discharging.

  Conductive agents included in the positive electrode or negative electrode mixture layer include graphites such as natural graphite and artificial graphite; carbon blacks such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black. Used.

  The binder to be included in the positive electrode or negative electrode mixture layer includes polyvinylidene fluoride (PVDF), fluorine resin such as polytetrafluoroethylene, acrylic resin such as polyacrylonitrile and polyacrylic acid, and rubber such as styrene butadiene rubber. And the like are used.

  As the electrolyte layer 7, for example, a polymer electrolyte, a solid electrolyte, a nonaqueous electrolytic solution impregnated in a separator, or the like can be used. Among these, a polymer electrolyte or a solid electrolyte is preferable from the viewpoint that leakage can be suppressed.

The polymer electrolyte is prepared, for example, by holding an electrolyte solution that is a mixture of a lithium salt and a non-aqueous solvent in a matrix polymer. Specific examples of the lithium salt include LiClO ₄ , LiBF ₄ , LiPF ₆ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , and imide salts. Specific examples of the non-aqueous solvent include, for example, cyclic carbonates such as propylene carbonate, ethylene carbonate, and butylene carbonate; chain carbonates such as diethyl carbonate, ethyl methyl carbonate, and dimethyl carbonate; γ-butyrolactone, γ-valero And cyclic carboxylic acid esters such as lactones. Specific examples of the matrix polymer include, for example, polyvinylidene fluoride (PVdF), a copolymer containing vinylidene fluoride (VdF) and hexafluoropropylene (HFP) as repeating units, vinylidene fluoride (VdF) and trifluoroethylene. Fluoropolymers such as copolymers containing (TFE) as a repeating unit, silicon gel, acrylic gel, acrylonitrile gel, polyphosphazene modified polymer, polyethylene oxide, polypropylene oxide, and composite polymers, cross-linked polymers, modified polymers thereof, etc. Is mentioned.

  The solid electrolyte can be prepared, for example, by depositing a lithium ion conductor on the surface of the positive electrode or the negative electrode by using a PVD method or a CVD method. Specific examples of the lithium ion conductor include lithium sulfide.

  The nonaqueous electrolytic solution impregnated in the separator is prepared by mixing the lithium salt as described above and a nonaqueous solvent. As the separator, for example, a microporous film formed from a resin such as a polyolefin such as polyethylene or polypropylene or a polyamide such as polyamideimide is preferably used. The thickness of the separator is, for example, 8 to 30 μm.

  The negative electrode lead 3 and the positive electrode lead 6 are connected to the negative electrode current collector sheet or the positive electrode current collector sheet, for example, by welding. As the negative electrode lead, for example, a copper lead, a copper alloy lead, a nickel lead or the like is preferably used. As the positive electrode lead, for example, a nickel lead or an aluminum lead is preferably used.

A thin battery is produced as follows, for example.
The negative electrode and the positive electrode are arranged so that the negative electrode active material layer and the positive electrode active material layer face each other, and are overlapped via the electrolyte layer to constitute an electrode group. At this time, a negative electrode lead is attached to the negative electrode, and a positive electrode lead is attached to the positive electrode. On the other hand, after the electrode group is inserted from one opening of the first exterior body formed in a cylindrical shape, the opening is closed by thermal welding. At this time, the electrode group is arranged so that a part of the positive electrode lead and the negative electrode lead is exposed to the outside from one opening of the cylindrical first exterior body. This exposed portion becomes a positive external terminal and a negative external terminal. Next, after injecting a non-aqueous electrolyte from the other opening of the cylindrical first exterior body, the opening is closed by thermal welding. In this way, the electrode group is sealed in the first exterior body.

Next, a thin battery according to another embodiment of the present invention will be described with reference to FIG.
The battery 21A of FIG. 12 includes an electrode group 13A and an exterior body 8A that houses the electrode group 13A. The electrode group 13A includes a single negative electrode 11A, a pair of positive electrodes 12A arranged so as to sandwich the negative electrode 11A, and an electrolyte layer 7A interposed between the negative electrode 11A and the positive electrode 12A. Such a structure has good symmetry, and even if it is bent in any direction, there is no great difference in the degree of stress applied to the battery 21A. Therefore, for example, it is convenient in that it is not necessary to be aware of the direction of the battery when the battery 21A is incorporated into an electronic device.

  The negative electrode 11A has a negative electrode active material layer 2A attached to both surfaces of the negative electrode current collector sheet 1A and the negative electrode current collector sheet 1A. On the other hand, the pair of positive electrodes 12A includes the positive electrode current collector sheet 4A and the positive electrode active material layer 5 attached only to one surface of the positive electrode current collector sheet 4A. The pair of positive electrodes 12A are arranged with the negative electrode 11A interposed therebetween so that the positive electrode active material layer 5A and the negative electrode 11A face each other with the electrolyte layer 7 interposed therebetween. A negative electrode lead 3A is connected to the negative electrode current collector sheet 1A, and a positive electrode lead 6A is connected to the positive electrode current collector sheet 4A. Part of the negative electrode lead 3A and the positive electrode lead 6A is exposed to the outside from the exterior body 8A, and the exposed portions function as a negative electrode terminal and a positive electrode terminal. Note that a sealing material 10 may be interposed between the exterior body 8A and each lead in order to improve the sealing performance. A thermoplastic resin can be used for the sealing material 10.

Next, with reference to FIG. 13, the sheet-like material (laminate film) which can be applied to an exterior body and has a barrier layer and resin layers formed on both surfaces thereof will be described in detail.
The laminate film 8 includes an inorganic material layer (barrier layer) 8a, a first resin film 8b bonded to one surface of the barrier layer 8a, and a second resin film bonded to the other surface of the barrier layer 8a. 8c.

The inorganic material used for forming the barrier layer 8a is not particularly limited, but it is preferable to use a metal layer, a ceramic layer, or the like in terms of barrier performance, strength, bending resistance, and the like. Further, an inorganic material capable of forming a barrier layer having a withstand voltage of 3 volts or more on the basis of lithium (vs. Li ⁺ / Li) is preferable. Specifically, for example, metal materials such as aluminum, titanium, nickel, iron, platinum, gold, and silver, and inorganic oxide materials such as silicon oxide, magnesium oxide, and aluminum oxide are preferable. By forming a barrier layer having excellent withstand voltage, damage due to oxidation or the like of the barrier layer can be suppressed. Among these, aluminum oxide and silicon oxide are particularly preferable from the viewpoint of excellent balance between flexibility and barrier properties of the obtained laminate film, and aluminum is particularly preferable from the viewpoint of low manufacturing cost.

  The thickness of the barrier layer of the exterior body is desirably as thin as possible from the viewpoint of ensuring the flexibility of the exterior body, and is preferably 35 μm or less, more preferably 20 μm or less, and even more preferably 0.5 μm or less. However, from the viewpoint of ensuring barrier properties during the use period of the thin battery or battery device, for example, 0.01 μm or more is preferable, 0.05 μm or more is more preferable, and 0.1 μm or more is more preferable. These upper limits and lower limits can be arbitrarily combined to set the thickness range. For example, a barrier layer having a thickness of 0.01 to 0.5 μm is preferable.

  A laminate film having a barrier layer having a preferred thickness of 0.01 to 0.5 μm forms a vapor deposition layer 8a of an inorganic material having a thickness of 0.01 to 0.5 μm on one surface of the first resin film 8b, It is manufactured by laminating the second resin film 8c. The vapor deposition layer 8a is formed by depositing an inorganic material so that the average thickness becomes 0.01 to 0.5 μm. Specific examples of the vapor deposition method include vacuum vapor deposition, sputtering, ion plating, laser ablation, chemical vapor deposition, plasma chemical vapor deposition, and thermal spraying. Of these, the vacuum evaporation method is particularly preferably used.

  The average thickness of a vapor deposition layer becomes like this. Preferably it is 0.01-1 micrometer, More preferably, it is 0.01-0.5 micrometer. By setting the average thickness of the vapor deposition layer to 0.5 μm or less, the laminate film becomes particularly excellent in flexibility, and as a result, the flexibility of the battery also increases. Moreover, the barrier property of the grade requested | required of an exterior body can fully be ensured by the average thickness of a vapor deposition layer being 0.01 micrometer or more.

  A laminate film having a thicker barrier layer is produced, for example, by laminating a metal foil 8a having a thickness of 10 to 35 μm between the first resin film 8b and the second resin film 8c. .

  From the viewpoint of ease of thermal welding, electrolyte resistance, and chemical resistance, the resin film material disposed on the inner surface side of the exterior body is a polyolefin such as polyethylene (PE) or polypropylene (PP), polyethylene terephthalate, or polyamide. Polyurethane, polyethylene-vinyl acetate copolymer (EVA) and the like are preferable. From the same viewpoint, the thickness of the resin film on the inner surface side is preferably 10 to 100 μm, more preferably 10 to 50 μm.

  From the viewpoint of strength, impact resistance and chemical resistance, the resin film disposed on the outer surface side of the exterior body is polyamide (PA) such as 6,6-nylon, polyolefin, polyethylene terephthalate (PET), polybutylene terephthalate. Polyesters such as are preferred. From the same viewpoint, the thickness of the resin film on the outer surface side is preferably 5 to 100 μm, more preferably 10 to 50 μm.

  Specifically, PP / Al foil / PA laminate film, PP / Al foil / PP laminate film, PE / Al foil / PE laminate film, acid-modified PP / PET / Al foil / PET Laminate film, acid-modified PE / PA / Al foil / PET laminate film, ionomer resin / Ni foil / PE / PET laminate film, EVA / PE / Al foil / PET laminate film, ionomer resin / PET / Al foil / PET laminate film.

  The total thickness of the laminate film is, for example, 15 to 300 μm, and preferably 30 to 150 μm. If the total thickness of the laminate film is in the above range, various performances required for the exterior body can be sufficiently secured, and the thickness of the thin battery or the battery package can be easily kept small.

  The tensile modulus of the outer package is preferably 10 to 700 MPa. In a thin battery in which the thickness of the electrode group is reduced, the influence of the flexibility of the outer package on the improvement of the flexibility of the entire battery cannot be ignored. By setting the tensile elastic modulus of the exterior body that hermetically houses the electrode group and the nonaqueous electrolyte (that is, the power generation element) to 10 to 700 MPa, the flexibility of the battery is improved and the feeling of wearing on the human body is greatly improved. Moreover, the intensity | strength required as an exterior body can be maintained. From the viewpoint of flexibility, it is desirable that the tensile modulus of the outer package is small, for example, 90 MPa or less is desirable, 80 MPa or less is more preferable, and 50 MPa or more is more preferable. However, in consideration of mechanical strength such as bending resistance, it is preferably 5 MPa or more, more preferably 10 MPa or more, and further preferably 15 MPa or more. These upper and lower limits can be arbitrarily combined to set the range of the tensile modulus.

In addition, the tensile elasticity modulus of an exterior body can be measured with the following method.
First, the laminate film constituting the exterior body is cut out into a tensile test No. 3 dumbbell having a parallel part width of 5 mm and a distance between marked lines of 20 mm. Using this tensile test No. 3 dumbbell as a sample, a tensile test is performed using a universal testing machine at a tensile speed of 5 mm / min in accordance with JIS K7161, and a tensile elastic modulus is obtained.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to an Example.

Example 1
A thin battery having a basic structure similar to the battery shown in FIGS.

(1) Production of Negative Electrode As the negative electrode current collector sheet 1, an electrolytic copper foil having a thickness of 12 μm was prepared. A lithium metal foil (thickness: 20 μm) as the negative electrode active material layer 2 was pressure-bonded to one surface of the electrolytic copper foil with a linear pressure of 100 N / cm to obtain a negative electrode 11. This was cut out to a size of 50 × 50 mm having a tab portion of 5 mm × 5 mm at the center of one short side, and then a copper negative electrode lead 3 was ultrasonically welded to the tab portion.

(2) Production of positive electrode N-methyl-2-pyrrolidone containing electrolytic manganese dioxide heated at 350 ° C. as a positive electrode active material, acetylene black as a conductive agent, and polyvinylidene fluoride (PVDF) as a binder ( NMP) was mixed so that the weight ratio of manganese dioxide: acetylene black: PVDF was 100: 5: 5, and then an appropriate amount of NMP was added to obtain a positive electrode mixture paste.

  An aluminum foil (thickness: 15 μm) was prepared as the positive electrode current collector sheet 4. The positive electrode mixture is applied to one surface of the aluminum foil, dried at 85 ° C. for 10 minutes to form the positive electrode active material layer 5, and then compressed with a roll press at a linear pressure of 12000 N / cm. A positive electrode 12 was obtained. This was cut out to a size of 50 × 50 mm having a tab portion of 5 mm × 5 mm at the center of one short side, and then dried under reduced pressure at 120 ° C. for 2 hours. An aluminum positive electrode lead 6 was ultrasonically welded to the tab portion.

(3) Production of Electrode Group The negative electrode 11 and the positive electrode 12 were arranged so that the negative electrode active material layer 2 and the positive electrode active material layer 5 face each other. However, the positive electrode lead and the negative electrode lead were protruded in opposite directions. Thereafter, a separator made of a microporous polyethylene film (thickness 9 μm, width 32 mm) was disposed between the negative electrode 11 and the positive electrode 12, and an electrode group 13 was obtained.

(4) Battery assembly The electrode group 13 was housed in the outer package 8 made of a cylindrical laminate film having an aluminum barrier layer. The laminate film has a three-layer structure of PP layer (thickness 35 μm) / aluminum vapor-deposited film (thickness 0.05 μm) / nylon (PA) layer (thickness 15 μm), with a total thickness of about 50 μm and a tensile modulus of 50 MPa. A thing was used. The PP layer was placed on the inside and the PA layer on the outside.

The positive electrode lead 6 was passed through one opening of the outer package 8 and the negative electrode lead 3 was passed through the other opening, and a part of the positive electrode lead 6 and a part of the negative electrode lead 3 were exposed from the outer package 8. One opening of the outer package 8 was closed by thermal welding with the negative electrode lead 3 interposed therebetween. Next, 0.8 g of nonaqueous electrolyte was injected from the other opening of the outer package 8 and then deaerated for 10 seconds under a reduced pressure environment of 660 mmHg. As the non-aqueous electrolyte, a non-aqueous solvent in which LiClO ₄ was dissolved at a concentration of 1 mol / L was used. As the non-aqueous solvent, a mixed solvent of propylene carbonate and dimethoxyethane (volume ratio of 1: 1) was used.

  Thereafter, the other opening of the outer package 8 was closed by thermal welding with the positive electrode lead 6 interposed therebetween, and the electrode group 13 was sealed in the outer package 8. In this way, a thin battery 21 (battery X) having a size of 60 mm × 65 mm and a thickness of about 0.2 mm was produced. The obtained battery was aged at 45 ° C. for 1 day.

  The portions of the negative electrode lead 3 and the positive electrode lead 6 exposed from the inside of the outer package 8 to the outside were bent toward the same surface of the battery, covered with the insulating tape 10A except for the tip, and fixed to the battery. Next, copper foil and aluminum foil each having a size of 14 mm × 14 mm are welded to the tips of the negative electrode lead 3 and the positive electrode lead 6 as a negative electrode external terminal 23 and a positive electrode external terminal 24, respectively, and each is adhered to the outer surface of the outer package 8 with an adhesive. Pasted. An adhesive was applied to the margin of the surface of the exterior body to which the copper foil and the aluminum foil were attached.

(5) Production of battery device (battery-electronic device assembly) An iontophoresis transdermal administration device having a size of 80 mm x 70 mm as shown in Figs. A semiconductor element 112 having a constant current diode is arranged at the center of one surface of the dosing device, and a pair of electrodes 113 and 114 and a pair of reservoirs 113a and 114a stacked thereon are arranged in parallel on the other surface. Arranged. A pair of connection terminals that are electrically connected to the electrodes 113 and 114 are disposed on both sides of the semiconductor element 112. The pair of connection terminals were brought into contact with the negative electrode external terminal 23 and the positive electrode external terminal 24 of the battery, respectively, and as shown in FIG. The battery and the dispensing device were fixed to each other by the adhesive applied to the battery.

  In the above configuration, the pair of reservoirs 113a and 114a can function as the negative electrode external terminal 23 and the positive electrode external terminal 24 as the negative electrode SW terminal and the positive electrode SW terminal of the forced discharge operation switch, respectively.

[Evaluation]
The battery device dosing device was activated and 10% of the battery capacity was consumed. Then, the battery-electronic device assembly was folded in two and fixed so that the pair of reservoirs of the dosing device contacted each other. When the battery voltage was measured after 24 hours, it was 0.05 V, and it was confirmed that the battery was in a completely discharged state.

  The battery device of the present invention is suitable for use in a small electronic device such as an iontophoresis transdermal administration device or a biological information measurement device used by being attached to a living body.

  1: negative electrode current collector sheet, 2: negative electrode active material layer, 3: negative electrode lead, 4: positive electrode current collector sheet, 5: positive electrode active material layer, 6: positive electrode lead, 7: electrolyte layer, 8: first exterior Body, 9: second exterior body, 11: negative electrode, 12: positive electrode, 13: electrode group, 21, 101: thin battery, 31: battery package, 40, 102: electronic device, 41: holding member, 42, 100 : Battery device, 103: first switch, 104: forced discharge operation switch (second switch), 105: resistor, 110: first circuit, 120: second circuit

Claims (20)

A thin battery comprising: a first electrode, a second electrode, and a sheet-like electrode group comprising an electrolyte layer interposed between the first electrode and the second electrode; and an exterior body for hermetically housing the electrode group Comprising
A battery device comprising a forced discharge operation switch for switching between a state in which the first electrode and the second electrode are externally short-circuited and a state in which the first electrode and the second electrode are not externally short-circuited. The forced discharge operation switch is
A first SW terminal for forming a short circuit electrically connected to the first electrode;
A second SW terminal for forming a short circuit electrically connected to the second electrode,
When the first SW terminal and the second SW terminal are switched from the electrically disconnected state to the connected state, the first electrode and the second electrode are externally short-circuited, and the battery is forced to be discharged. The battery device according to claim 1, which is performed.   Furthermore, the battery device of Claim 2 which comprises the electronic device driven by the electric power supply from the said battery.   The battery device according to claim 3, wherein the battery and the electronic device are integrated into a sheet.   The battery device according to any one of claims 2 to 4, wherein the first SW terminal and the second SW terminal can be connected by bending the battery device.   The battery device according to claim 5, wherein the battery device is bent and the bending of the battery device is fixed in a state where the first SW terminal and the second SW terminal are connected.   The external short circuit formed when the first electrode and the second electrode are short-circuited externally includes a resistor of 1 kΩ or more connected in series to the first electrode and the second electrode. The battery device according to any one of 1 to 6.   The battery device according to any one of claims 3 to 7, wherein the electronic device is a biological information measuring device or an iontophoretic transdermal administration device having a pair of electrodes facing the living body. The electronic device is the iontophoresis transdermal dosage device;
One of the pair of electrodes is formed integrally with the first SW terminal,
The battery device according to claim 8, wherein the other of the pair of electrodes is formed integrally with the second SW terminal.   The battery device according to claim 1, wherein the battery has a thickness of 1 mm or less.   The battery device according to any one of claims 1 to 10, wherein a tensile elastic modulus of the exterior body is 10 to 700 MPa.   The battery device according to claim 11, wherein the outer package includes a barrier layer against water vapor and a resin layer formed on both surfaces of the barrier layer, and the thickness of the barrier layer is 35 μm or less. The first electrode includes a first current collector sheet and a first active material layer attached to a surface thereof,
The second electrode includes a second current collector sheet and a second active material layer attached to the surface thereof,
The battery device according to claim 1, wherein the electrolyte layer includes a non-aqueous electrolyte and is interposed between the first active material layer and the second active material layer. The first active material layer is attached only to one surface of the first current collector sheet;
The second active material layer is attached only to one surface of the second current collector sheet;
The battery device according to claim 13, wherein the other surface of the first current collector sheet and the other surface of the second current collector sheet are in contact with the inner surface of the exterior body. A pair of the first electrodes;
The first active material layer is attached only to one surface of the first current collector sheet,
The second active material layer is attached to both surfaces of the second current collector sheet,
The second electrode is sandwiched between first active material layers of the pair of first electrodes,
The battery device according to claim 13, wherein the other surface of the first current collector sheet of the pair of first electrodes is in contact with the inner surface of the exterior body.   The battery device according to any one of claims 13 to 15, wherein the first active material layer or the second active material layer contains metallic lithium or a lithium alloy. A thin battery comprising: a first electrode, a second electrode, and a sheet-like electrode group comprising an electrolyte layer interposed between the first electrode and the second electrode; and an exterior body for hermetically housing the electrode group A forced discharge operation switch for switching between a state in which the first electrode and the second electrode are externally short-circuited and a state in which the first electrode and the second electrode are not externally short-circuited, A battery device operating method comprising:
During the normal discharge of the battery, the state where the first electrode and the second electrode are not short-circuited externally,
After the normal discharge of the battery, the forced discharge operation switch changes the state where the first electrode and the second electrode are not externally short-circuited to the state where the first electrode and the second electrode are externally short-circuited. An operation method of switching and forcibly discharging the battery. The forced discharge operation switch is
A first SW terminal for forming a short circuit electrically connected to the first electrode;
A second SW terminal for forming a short circuit electrically connected to the second electrode,
After the normal discharge of the battery, the first electrode and the second electrode are externally short-circuited by switching from the electrically non-connected state to the connected state. The method for operating a battery device according to claim 17.   Furthermore, the operation method of the battery device of Claim 17 or 18 provided with the electronic device driven by the electric power supply from the said battery.   The method of operating a battery device according to claim 19, wherein the first SW terminal and the second SW terminal can be connected by bending the battery device.

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