Rotating body and method for manufacturing same

Abstract

The rotating body includes a rotating portion and a device fixed to the rotating portion. The device includes a substrate, a power receiving unit, and a flat secondary battery mounted on the substrate. The power receiving unit has a structure for receiving power supply using electromagnetic induction. A secondary battery includes an outer package including a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The secondary battery is disposed further inward than the substrate when viewed from the center of rotation of the rotating portion.

Description

Technical Field

[0001] The present invention relates to a rotating body including a rotating portion of a device having a flat secondary battery fixed thereto, and a method for manufacturing the same. Background Art

[0002] In the rotating parts of factory automation equipment (FA equipment), cameras or devices for monitoring the position and status of rotating parts such as motors and drills are sometimes installed. In addition, devices for monitoring the status of tires are sometimes installed on tires. Various proposals have been made regarding the installation methods of batteries used in these devices.

[0003] Claim 1 of Patent Document 1 (Japanese Patent Application Publication No. 2011-014452) states, "A method for mounting a flat battery, characterized in that the method is a method for mounting a flat battery used in a device for mounting on a tire having a substrate, and the flat battery is arranged on the inner side of the substrate when viewed from the rotation center of the tire."

[0004] Claim 1 of Patent Document 2 (International Publication No. 2017 / 155035) states that "a tire pressure detection system is a tire pressure detection system arranged in a tire, comprising an air pressure detection device for detecting the air pressure in the tire and a secondary battery for supplying power to the air pressure detection device, wherein the secondary battery is a lithium secondary battery having a negative electrode with a lithium alloy as an active material and a positive electrode."

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2011-014452

[0008] Patent Document 2: International Publication No. 2017 / 155035 Summary of the invention

[0009] Factory automation equipment (FA equipment) includes various rotating parts that are subject to centrifugal force, such as robot arms, surveillance cameras, motors, and tires. The information obtained from sensors located in these rotating parts is important, but due to the sudden disconnection of electrical wiring and the frequent replacement of primary batteries, research is being conducted on the use of secondary batteries to maintain the information obtained. In Patent Document 1,

[0010] As a method for preventing damage to components inside the battery caused by external impact and vibration caused by the running of a motor vehicle, a method for installing the battery on a substrate in a device installed on a rotating part has been proposed, but the influence of charging and discharging of the secondary battery has not been taken into account. In Patent Document 2, a lithium secondary battery using a lithium alloy as a negative electrode active material is proposed as a power source for a tire pressure detection system, but the evaluation was carried out with a single cell. There is no: an actual device is envisioned, and the evaluation is carried out in a state where a flat secondary battery is installed on a substrate and electrically connected.

[0011] The device fixed to the rotating body of the present invention does not require battery replacement, is suitable for monitoring the state of the rotating part, and has high long-term reliability.

[0012] A rotating body according to one aspect of the present invention comprises a rotating part configured to rotate around a rotation center and a device fixed to the rotating part. The device comprises a substrate, a power receiving part, and a flat secondary battery mounted on the substrate. The power receiving part has a structure for receiving power using electromagnetic induction. The flat secondary battery comprises an outer packaging body, and the outer packaging body comprises a positive electrode tank having a bottom cylindrical shape and a negative electrode tank having a bottom cylindrical shape. The flat secondary battery is arranged closer to the rotation center than the substrate when viewed from the rotation center of the rotating part.

[0013] In a method for manufacturing a rotating body according to another aspect of the present invention, a device including a substrate, a power receiving unit, and a flat secondary battery mounted on the substrate is prepared. A rotating portion configured to rotate around a rotation center is prepared. The device is fixed to the rotating portion. The power receiving unit has a structure for receiving power using electromagnetic induction. The flat secondary battery includes an outer packaging body, and the outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The step of fixing the device to the rotating portion includes the step of fixing the device to the rotating portion in a manner that the flat secondary battery is arranged closer to the rotation center than the substrate when viewed from the rotation center of the rotating portion.

[0014] According to the present invention, it is possible to obtain a rotating body to which a device suitable for monitoring the state of a rotating part with high long-term reliability is fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 An example of the device and the rotating part of the first embodiment is schematically shown.

[0016] Figure 2A This is a plan view schematically showing an example of a flat secondary battery used in the device of Embodiment 1.

[0017] Figure 2BSchematically represents the Figure 2A A cross section of the flat secondary battery taken along line IIB-IIB.

[0018] Figure 3 This is a diagram schematically showing the structure of an example of a device according to the first embodiment. DETAILED DESCRIPTION

[0019] Hereinafter, the embodiments of the present invention are described by way of example, but the present invention is not limited to the examples described below. In the following description, sometimes specific numerical values ​​and materials are illustrated, but as long as the effect of the present invention can be obtained, other numerical values ​​and materials can also be applied. In the following description, when the examples of constituent elements and the examples of methods are listed, as long as there is no special record, only one of the examples listed can be used, or a plurality of the examples listed can be used in combination.

[0020] (Device installed on the rotating part)

[0021] The device of the present embodiment is a device mounted on a rotating part. Hereinafter, the device is sometimes referred to as "device (D)". Device (D) includes a substrate, a power receiving part, and a flat secondary battery mounted on the substrate. The power receiving part has a structure for receiving power using electromagnetic induction. The flat secondary battery includes an outer packaging body, and the outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. For the flat secondary battery, it is arranged on the inner side than the substrate when viewed from the rotation center of the rotating part. The substrate can face the positive electrode can or the negative electrode can. In a preferred example, the positive electrode can faces the substrate, that is, the negative electrode can is located on the opposite side of the substrate relative to the positive electrode can.

[0022] In the device (D), the flat secondary battery is arranged inside the substrate when viewed from the rotation center of the rotating part. The power receiving unit that receives power from the outside using electromagnetic induction such as magnetic field resonance and magnetic field coupling is preferably arranged outside the substrate when viewed from the rotation center of the rotating part.

[0023] The power supply device using electromagnetic induction in the charging of the secondary battery is arranged outside the rotation center. Since the power supplied is inversely proportional to the distance, the power receiving part is preferably arranged outside the substrate. In addition, since the outer packaging can (positive electrode can and negative electrode can) of the flat secondary battery is magnetic, by arranging it inside the substrate to increase the distance from the power supply device, it is possible to suppress heating by the supplied magnetic flux (magnetic field). As a result, it is possible to suppress the temperature from rising above the ambient temperature due to electromagnetic induction heating, and to reduce significant degradation and swelling of the flat secondary battery. The outer packaging can is made by processing iron, stainless steel, corrosion-resistant metal, stainless steel and corrosion-resistant metal cladding materials, and raw materials for plating of the above materials. The raw material itself is magnetic, or it is processed to be magnetic.

[0024] In addition, in the device (D), from the viewpoint of degradation of the characteristics of the secondary battery, it is more preferable that the positive electrode can faces the substrate and the negative electrode can is arranged closer to the rotation center than the positive electrode can. That is, the positive electrode can is preferably located on the side opposite to the substrate with the negative electrode can as a gap. According to this structure, it is possible to suppress the heating of the negative electrode can by the magnetic flux (magnetic field) supplied from the outside of the rotating part due to power supply using electromagnetic induction. By utilizing these effects, it is possible to suppress degradation of the characteristics caused by the reaction between the negative electrode and the electrolyte. As for the reaction between the electrode active material of the positive and negative electrodes and the electrolyte, since the reaction (reduction) of the negative electrode and the electrolyte is particularly easy to occur at high temperatures, the battery characteristics can be maintained by suppressing the reaction of the negative electrode and the swelling of the battery.

[0025] The material of the positive electrode tank and the material of the negative electrode tank can be independently selected from at least one of austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy. The material of the positive electrode tank and the material of the negative electrode tank can be the same or different. As austenitic stainless steel, SUS301, SUS304, SUS305, SUS310, SU316, and SUS316L can be cited. As two-phase stainless steel, SUS329J1, SUS329J3L, and SUS329J4L can be cited. As a nickel alloy, 23Cr-35Ni-7.5Mo-0.2N and 23Cr-25Ni-5.5Mo-0.2N can be cited. These materials are weaker in magnetism than other materials. By using an outer packaging tank (positive electrode tank and negative electrode tank) made of a material with weak magnetism, it is possible to suppress the situation where the outer packaging tank is heated by the supplied magnetic flux due to power supply using electromagnetic induction. As a result, the degradation of the flat secondary battery due to the temperature rise can be further suppressed. As an effect, the above-mentioned material with weak magnetism can be used for one side of the outer packaging can. For example, it is used for the negative electrode can. It is more preferable to use the above-mentioned material with weak magnetism for both sides. As described above, according to the above-mentioned structure, a rotating body with a device suitable for monitoring the state of the rotating part and high long-term reliability can be obtained.

[0026] The rotating part may be a rotating part of a machine. The machine is not particularly limited as long as it is a machine that includes a rotating part of the mounting device (D). Examples of machines include transport machines, manufacturing machines, measuring machines, machine tools, and other machines. Examples of transport machines include motor vehicles (four-wheeled motor vehicles, three-wheeled motor vehicles, two-wheeled motor vehicles, and other motor vehicles). Examples of manufacturing machines include factory automation equipment (FA equipment) and other manufacturing machines.

[0027] The rotating part may also be a tire. In this case, the device (D) may be used for monitoring the pressure inside the tire (tire pressure monitoring system: TPMS), monitoring the temperature inside the tire, monitoring the acceleration of the tire, and other monitoring of the tire monitoring system (TMS). According to these purposes, the device (D) includes necessary electronic components such as sensors.

[0028] When the rotating part is a tire, the device (D) is fixed to the inner surface of the tire (the surface not exposed to the outside air during use). For example, the device (D) can be fixed to the wheel hub, the valve, the surface of the tread of the tire opposite to the contact surface with the ground, or the inner surface of the tire sidewall surface. The method of fixing the device (D) to the tire is not limited.

[0029] The tire is not particularly limited, and may be a known tire. The tire may be a tire used in various transportation machines, or may be other tires.

[0030] The rotating part may be a rotating part included in factory automation equipment (FA equipment). In this case, the device (D) can be used to monitor the rotating part and / or the surrounding conditions using a camera, etc., monitor the position of the rotating part, monitor the temperature of the rotating part, and other monitoring. According to these purposes, the device (D) includes necessary electronic components such as sensors.

[0031] As a rotating part, factory automation equipment (FA equipment) is completely unaffected by the damage of the components inside the battery caused by external impact and vibration compared to tires, so it is more preferred. In addition, even in terms of tires, the impact of external impact and vibration on the wheel hub and valve is less than that on the tread and sidewall of the tire, so it is preferred. In addition, even from the perspective of the impact of temperature changes in the surrounding environment, as a rotating part, factory automation equipment (FA equipment) is less affected by temperature changes due to continuous operation than tires, so it is preferred. If the temperature change impact is large, the fluctuation of the charging efficiency and the deterioration reaction of the secondary battery during charging and discharging are likely to be accelerated. For factory automation equipment (FA equipment), if it is a human environment, the ambient environment is up to about 40°C, and if it is used continuously, the temperature of the device reaches 70°C and 85°C. In addition, it reaches 105°C, 125°C, and 150°C in an unmanned environment and special circumstances. For example, a drill bit can be considered. In the case of tires, it will also reach 105°C, 125°C, and 150°C due to the road surface temperature and the state of rotation.

[0032] The device (D) may be fixed to any position of the rotating part. For example, the device (D) may be arranged near the outer periphery of the rotating part. The method of fixing the device (D) to the rotating part is not limited.

[0033] The battery can be mounted on the substrate using a battery fixture (the same applies to the mounting method (M) described below). Alternatively, a terminal may be provided on the flat secondary battery side and the terminal may be mounted on the substrate (the same applies to the mounting method (M) described below).

[0034] (Method of installing a flat secondary battery)

[0035] The installation method of the present embodiment is an installation method for a flat secondary battery used in a device including a substrate installed on a rotating part. Hereinafter, this installation method is sometimes referred to as "installation method (M)". The rotating body includes a rotating part and a device (D) fixed to the rotating part, the device (D) is prepared, the rotating part is prepared, and the device (D) is fixed to the rotating part, thereby manufacturing the rotating body. The device (D) includes a power receiving part and a flat secondary battery installed on the substrate. The power receiving part has a structure for receiving power using electromagnetic induction. The flat secondary battery includes an outer packaging body, and the outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. For the flat secondary battery, it is arranged on the inner side than the substrate when viewed from the rotation center of the rotating part. The substrate can face the positive electrode can or the negative electrode can. In a preferred example, the positive electrode can faces the substrate. As described above, for the power receiving part, it is preferably arranged on the outer side than the substrate when viewed from the rotation center of the rotating part.

[0036] The mounting method (M) can be performed by mounting the flat secondary battery as described in the device (D). Since the matters described in the device (D) can be applied to the mounting method (M), the repeated description is sometimes omitted. According to the mounting method (M), the effects described in the device (D) can be obtained.

[0037] The following is a description of the configuration and components of the device (D) of this embodiment. However, the configuration and components of the device (D) are not limited to the following description. As described above, the following description can also be applied to the mounting method (M).

[0038] (Flat secondary battery)

[0039] A flat secondary battery is a battery with a circular plane shape, including coin-shaped and button-shaped secondary batteries. The flat secondary battery can be an aqueous secondary battery, a non-aqueous electrolyte secondary battery, a lithium secondary battery, or a lithium ion secondary battery. The lithium ion secondary battery is not particularly limited, and a known lithium ion secondary battery can be used. For example, a known coin-shaped lithium ion secondary battery using lithium titanate as the negative electrode active material can be used. The manufacturing method of the flat secondary battery is not limited, and it can be manufactured using a known method.

[0040] The flat secondary battery includes a positive electrode, a negative electrode, an electrolyte, and an outer package. A separator may be disposed between the positive electrode and the negative electrode. There are no particular limitations on matters other than those required in the embodiments of the present invention, and known structures and components may be applied.

[0041] The positive electrode includes a positive electrode mixture, and the positive electrode mixture includes a positive electrode active material. The positive electrode active material can use a material that can reversibly absorb and release lithium ions. Examples of positive electrode active materials include composite oxides containing at least one selected from Ni, Co, Mn and Al and lithium, such as lithium cobalt oxide, lithium manganese oxide, ternary nickel-manganese-cobalt lithium composite oxide, olivine-type lithium iron phosphate, and lithium cobalt phosphate. The positive electrode mixture may include various additives (binders, conductive materials, etc.) on the basis of the positive electrode active material. Alternatively, the positive electrode mixture consisting only of the positive electrode active material without various additives can be sintered and used as the positive electrode. The negative electrode includes a negative electrode mixture, and the negative electrode mixture includes a negative electrode active material. The negative electrode mixture may include various additives (binders, conductive materials, etc.) on the basis of the negative electrode active material. Alternatively, the negative electrode mixture consisting only of the negative electrode active material without various additives can be sintered and used as the negative electrode. The positive electrode and the negative electrode can be formed into a cylindrical shape, respectively. In addition, when the positive electrode and the negative electrode are formed into a cylindrical shape, the influence of uneven distribution of the electrolyte due to centrifugal force can be reduced.

[0042] Lithium metal or lithium alloy can also be used as the negative electrode active material. However, when lithium metal is used, the capacity is reduced due to the formation of dendrites. When lithium alloy is used, the negative electrode active material is pulverized due to the expansion and contraction of the negative electrode active material during charge and discharge, and the discharge capacity is easily reduced. In addition, from the perspective of damage to the components inside the battery caused by external impact and vibration, lithium alloy materials are also more susceptible to being affected. Therefore, it is preferred to use an oxide (such as a transition metal oxide) that can reversibly absorb and release lithium ions as the negative electrode active material. Transition metal oxides contain at least transition metals and may also contain elements other than transition metals. The oxides of the negative electrode active material (such as transition metal oxides) are SiO, SnO, CuO, Cu2O, Fe2O3, Fe3O4, ZnO, PbO, MoO, MoO2, TiO2, Nb2O5, TiNb2O7, Li4Ti5O 12 、Li2TiO3、Li 1.4 Al 0.4 Ti 1.6 (PO4)3, etc. As the element that can be added to the above oxide, there can be mentioned at least one selected from Fe, Mn, Ni, Co, Sc, Y, Cu, Zn, Al, Cr, Pb, Sb, Mg and B. MoO, MoO2, TiO2, Nb2O5, TiNb2O7, Li4Ti5O, which have a potential of 1V or more relative to metallic lithium and are not easily reductively decomposed by non-aqueous electrolytes or solid electrolytes, are preferred. 12 、Li2TiO3、Li 1.4 Al 0.4 Ti1.6 (PO4) 3. Alternatively, a composite oxide containing lithium and titanium that has very little expansion and contraction (volume change) during charge and discharge may be used, or a composite oxide of lithium and titanium may be used.

[0043] Examples of the composite oxide include lithium titanate, specifically, Li4Ti5O 12 A portion of Ti may be replaced by other elements, and the content of the other elements is smaller than the content of Ti. Examples of other elements include at least one selected from Fe, Mn, Ni, Co, Sc, Y, Cu, Zn, Al, Cr, Pb, Sb, Mg and B.

[0044] The electrolyte may be a non-aqueous electrolyte in which a lithium salt is dissolved in a non-aqueous solvent, or an inorganic solid electrolyte such as a sulfide-based, oxide-based, chloride-based, etc. containing lithium, a solid electrolyte such as a polymer solid electrolyte containing lithium, or an ionic liquid. If a solid electrolyte is used, the influence of uneven distribution of the electrolyte due to centrifugal force can be completely ignored, so it is more preferred. The separator may be a non-woven fabric or a microporous membrane made of an insulating material (such as an insulating resin) such as an olefin-based material such as polypropylene and polyethylene, an engineering plastic material such as polyphenylene sulfide and polyetheretherketone, a cellulose-based material, an inorganic material such as glass, or the like.

[0045] The outer packaging body includes a positive electrode tank with a bottom cylindrical shape and a negative electrode tank with a bottom cylindrical shape. The positive electrode tank and the negative electrode tank are arranged to face each other with a gasket sandwiched therebetween, forming a coin-shaped or button-shaped outer packaging body. The positive electrode mixture is arranged on the positive electrode tank side, and the negative electrode mixture is arranged on the negative electrode tank side. The materials of the positive electrode tank, the negative electrode tank and the gasket are not particularly limited, and the known materials used by each can be used. However, the material of the positive electrode tank and the negative electrode tank is preferably the above-mentioned material (austenitic stainless steel, nickel alloy). The material of the gasket is preferably able to withstand the operating temperature of the flat secondary battery (above 150°C). For example, engineering plastics such as polyphenylene sulfide (PPS), polyetheretherketone (PEEK), copolymers of tetrafluoroethylene and perfluoroether (PFA), olefin-based materials, etc. In addition, materials with glass and fillers added to the above-mentioned materials can also be used.

[0046] The positive electrode can can function as a positive terminal, and the negative electrode can can function as a negative terminal. A conductive layer (carbon layer, current collector, etc.) can be disposed between the positive electrode mixture and the positive electrode can. A conductive layer (carbon layer, current collector, etc.) can be disposed between the negative electrode mixture and the negative electrode can.

[0047] The positive electrode can is preferably disposed to face the substrate. The bottom surface of the positive electrode can is usually disposed substantially parallel to the substrate, but may be inclined to a certain degree (eg, an angle of 30° or less) relative to the substantially parallel state to the substrate.

[0048] (Substrate)

[0049] The substrate is not particularly limited as long as it is a substrate that can stably hold a flat secondary battery. A known substrate can be used as the substrate. Examples of substrates include known substrates used as printed circuit boards. Examples of materials for the substrate include paper, resin, glass, and ceramics. The substrate can be formed using at least one of these materials. The substrate includes electrical wiring.

[0050] (Electronic components other than flat secondary batteries, etc.)

[0051] The device (D) may include electronic components other than the flat secondary battery (the electronic components may constitute electronic equipment) etc. depending on its purpose. Examples of such electronic components include sensors, cameras, power receiving units, transmission units, processing units, etc. Power is supplied to these electronic components from the flat secondary battery as needed.

[0052] Examples of sensors include sensors for monitoring rotational position, pressure sensors, acceleration sensors, temperature sensors, position sensors, etc. Pressure sensors are used, for example, to monitor the pressure inside a tire. The transmitting unit is a component for transmitting various information (such as information obtained by a sensor, etc.) to the receiving unit, and includes an antenna, etc. The processing unit performs various processing and control. For example, the processing unit transmits information output from a sensor via an antenna. The processing unit may use an integrated circuit (IC), etc.

[0053] The information transmitted from the transmission unit is received by a reception unit disposed in a machine body (a vehicle body, FA equipment, etc.), etc. The received information is processed and utilized by a control device disposed in the machine including a rotating part.

[0054] The flat secondary battery of the device (D) can be charged by wireless power supply using electromagnetic induction such as magnetic field resonance and magnetic field coupling. Therefore, the power transmission unit (coil, antenna, etc.) used for wireless power supply is arranged on the machine body (car body, FA equipment, etc.). The power receiving unit is a part that generates power by electromagnetic induction. Examples of the power receiving unit include coils and antennas.

[0055] (terminal)

[0056] One end of the terminal (lead terminal) can be connected to the positive electrode can and the negative electrode can, respectively. The other end of the terminal can be connected to the electrical wiring of the substrate. The shape of the terminal is not particularly limited as long as electrical connection can be achieved. For example, a terminal made of a metal such as stainless steel can be used. In the case of wireless power supply using electromagnetic induction such as magnetic field resonance and magnetic field coupling, materials with weak magnetism are particularly preferred. The materials can each independently be at least one selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and nickel alloy. The materials of the positive electrode can and the negative electrode can can be the same or different from each other. The terminal is connected to the outer packaging can of the flat secondary battery, for example, by resistance welding or laser welding. In addition, regarding the electrical connection between the substrate and the terminal, for example, the terminal is welded to the substrate.

[0057] (Battery fixture)

[0058] The battery fixture can be mounted on the substrate in a manner that a single cell is inserted to form an electrical contact. The terminal portion that contacts the battery uses a metal such as stainless steel. In the case of wireless power supply using electromagnetic induction such as magnetic field resonance and magnetic field coupling, a material with weak magnetism is particularly preferred. The material can be independently selected from at least one of austenitic stainless steel, a two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

[0059] (resin)

[0060] The device (D) may include a resin covering a flat secondary battery and / or an electronic component. The resin may be a resin used for sealing electronic components. Examples of the resin include epoxy resin and silicone resin. The resin may also include fillers such as inorganic particles.

[0061] The resin may be disposed between the substrate and the flat secondary battery. The resin may be disposed so as to surround the flat secondary battery. The resin may also be disposed so as to surround the flat secondary battery and the terminals connected thereto. According to this configuration, it is particularly possible to suppress the flat secondary battery from being disconnected from the terminal or the flat secondary battery from being separated from the battery fixture. In the case where the device (D) includes a shell surrounding the flat secondary battery, the interior of the shell may be filled with resin.

[0062] (case)

[0063] The device (D) may include a shell surrounding the flat secondary battery. The shell may surround a portion of the device (D) or the entire device (D). However, the shell is selected so that wireless power supply using electromagnetic induction can be performed. The shell is not particularly limited, and a shell made of metal and / or resin can be used.

[0064] Hereinafter, examples of embodiments of the present invention are specifically described with reference to the accompanying drawings. The embodiments described below can be changed based on the above description. In addition, the matters described below can also be applied to the above embodiments. In addition, in the embodiments described below, matters that are not essential to the invention of the present invention can be omitted.

[0065] (Implementation method 1)

[0066] In Embodiment 1, examples of the device (D) and the mounting method (M) are described. Figure 1 1 shows a side view of an example of a rotating part 10 on which the device 100 is installed. The rotating body 50 includes the rotating part 10 and the device 100 fixed to the rotating part 10. It should be noted that Figure 1 , only the outer edge of the rotating portion 10 is shown. The rotating portion 10 is configured to rotate around the rotation center C.

[0067] The device 100 includes a flat secondary battery 200. The top view of the secondary battery 200 is shown in FIG. Figure 2A In Figure 2A The cross-sectional view at the line IIB-IIB is shown in Figure 2B In. Figure 2A and Figure 2B As shown, the secondary battery 200 has a coin-shaped (low cylindrical) shape.

[0068] The secondary battery 200 includes an outer package 210, a positive electrode 221, a negative electrode 222, a separator 223, and a non-aqueous electrolyte. The outer package 210 includes a bottomed cylindrical positive electrode can 211, a bottomed cylindrical negative electrode can 212, and a gasket 213. The positive electrode can 211 and the negative electrode can 212 face each other with the gasket interposed therebetween, thereby forming a coin-shaped outer package 210.

[0069] The positive electrode can 211 includes a circular bottom surface 211 b and a cylindrical portion rising from the outer edge of the bottom surface 211 b. The negative electrode can 212 includes a circular bottom surface 212 b and a cylindrical portion rising from the outer edge of the bottom surface 212 b. Figure 2B In the example shown, at least a part of the cylindrical portion of the negative electrode can 212 is arranged inside the cylindrical portion of the positive electrode can 211. The positive electrode can 211 and the negative electrode can 212 are made of austenitic stainless steel SUS316L.

[0070] The positive electrode 221 and the negative electrode 222 are formed by forming the positive electrode mixture and the negative electrode mixture into a cylindrical shape, respectively. Thereafter, drying is performed by heating at a temperature of 100°C or higher. The positive electrode mixture contains lithium cobalt oxide as an active material, acetylene black as a conductive agent, and a fluorine-based resin as a binder. The negative electrode mixture contains lithium titanate as an active material, acetylene black as a conductive agent, and a rubber-based material as a binder. The battery voltage is 2.6V in the charged state. The positive electrode 221 is arranged on the positive electrode can 211 side and abuts against the positive electrode can 211. The negative electrode 222 is arranged on the negative electrode can 212 side and abuts against the negative electrode can 212. A separator 223 is arranged between the positive electrode 221 and the negative electrode 222. The separator 223, the positive electrode 221, and the negative electrode 222 are filled with a non-aqueous electrolyte.

[0071] An example of the configuration and arrangement of the device 100 is schematically shown in Figure 3 It should be noted that in the following figures, some hatching is omitted for easy viewing of the drawings. Figure 3 In FIG. 1 , only a portion of the outer edge contour of the rotating portion 10 is shown. Figure 3 The device 100 includes a substrate 110 , terminals (lead terminals) 121 and 122 , a housing 140 , a power receiving unit 160 , and a flat secondary battery 200 .

[0072] In Embodiment 1, the example in which the power receiving unit 160 is arranged on the opposite side to the secondary battery 200 with the substrate 110 interposed therebetween is shown. However, at least a part of the power receiving unit 160 may be arranged on the same side as the secondary battery 200. The power receiving unit 160 is connected to the secondary battery 200 and the like via wiring.

[0073] The shell 140 surrounds the secondary battery 200 and functions as an outer packaging body of the device 100. The secondary battery 200 is welded to the wiring of the substrate 110 via the terminal 121 connected to the positive electrode can 211 and the terminal 122 connected to the negative electrode can 212. The material of the terminals 121 and 122 is composed of SUS304, which is an austenitic stainless steel. The power received by the power receiving unit 160 is supplied to the secondary battery 200 via the terminals 121 and 122. It should be noted that the shapes of the terminals 121 and 122 and the connection positions with the outer packaging can are not limited to Figure 3 Example shown.

[0074] For the secondary battery 200, when viewed from the rotation center C of the rotating part 10, it is arranged on the inner side than the substrate 110, that is, close to the rotation center C. The heating of the secondary battery caused by the magnetic flux of electromagnetic induction such as magnetic field resonance and magnetic field coupling from the outside is reduced. The secondary battery 200 is configured so that the positive electrode can 211 faces the substrate 110. The negative electrode can 212 is located on the opposite side of the substrate 110 relative to the positive electrode can 211. In addition, in the high-temperature charging state, the reaction between the negative electrode and the electrolyte can also be suppressed. Moreover, by using a material with weak magnetism as the material of the outer packaging can and the terminal, the heating caused by the magnetic flux can also be reduced.

[0075] The invention of Patent Document 1 is about preventing the damage of the components inside the battery caused by the impact and vibration from the outside of the tire. In this structure, it is not envisioned to use electromagnetic induction such as magnetic field resonance and magnetic field coupling for charging. The secondary battery is heated by the magnetic flux, and the degradation of the battery is accelerated. Therefore, the secondary battery needs to be replaced immediately. In addition, due to the expected swelling of the battery (at a temperature higher than the ambient temperature), the connection between the substrate and the terminal will peel off, the substrate will crack, etc. In addition, due to the influence of this heat, it is also possible to cause thermal degradation to other components installed together on the substrate. In the invention of Patent Document 2, although a scheme for installing a secondary battery on a rotating part is proposed, there is no device that takes charging into account. The present invention can realize a rotating body fixed with the following device, which is a device that uses electromagnetic induction charging in the actual rotating part, while improving the efficiency of receiving electricity, reducing the degradation of the secondary battery caused by heat, without the need to replace the battery, and with high long-term reliability.

[0076] (Note)

[0077] Based on the above description, the following technology is disclosed.

[0078] (Technique 1)

[0079] A rotating body, comprising:

[0080] A rotating part configured to rotate around a rotation center, and

[0081] A device fixed to the above rotating part,

[0082] The device includes a substrate, a power receiving unit, and a flat secondary battery mounted on the substrate.

[0083] The power receiving unit has a structure for receiving power using electromagnetic induction.

[0084] The flat secondary battery includes an outer package, and the outer package includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can.

[0085] The flat secondary battery is arranged closer to the rotation center than the substrate when viewed from the rotation center of the rotating portion.

[0086] (Technique 2)

[0087] According to the rotating body described in the first aspect, the power receiving unit is arranged outside the substrate in the rotating portion when viewed from the rotation center of the rotating portion.

[0088] (Technique 3)

[0089] The rotating body according to the technique 1 or 2, wherein the positive electrode can faces the substrate.

[0090] (Technique 4)

[0091] According to the rotating body described in the third aspect, the negative electrode can is located on the side opposite to the substrate with respect to the positive electrode can.

[0092] (Technique 5)

[0093] The rotating body according to any one of the techniques 1 to 4, wherein the material of the positive electrode can is at least one selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

[0094] The negative electrode can is made of at least one material selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

[0095] (Technique 6)

[0096] The rotating body according to any one of techniques 1 to 5, wherein the rotating part is a tire.

[0097] (Technique 7)

[0098] The rotating body according to any one of techniques 1 to 5, wherein the rotating portion is a rotating portion included in factory automation equipment.

[0099] (Technique 8)

[0100] A manufacturing method is a manufacturing method of a rotating body, the manufacturing method comprising:

[0101] A step of preparing a device including a substrate, a power receiving unit, and a flat secondary battery mounted on the substrate;

[0102] a step of preparing a rotating portion configured to rotate around a rotation center; and

[0103] The step of fixing the device to the rotating part,

[0104] The power receiving unit has a structure for receiving power using electromagnetic induction.

[0105] The flat secondary battery includes an outer package, and the outer package includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can.

[0106] The step of fixing the device to the rotating portion includes the step of fixing the device to the rotating portion such that the flat secondary battery is arranged closer to the rotation center than the substrate when viewed from the rotation center of the rotating portion.

[0107] (Technique 9)

[0108] According to the manufacturing method described in the eighth aspect, the power receiving unit is arranged outside the substrate when viewed from the rotation center of the rotating portion.

[0109] (Technology 10)

[0110] According to the manufacturing method described in technology 8 or 9, the positive electrode can faces the substrate.

[0111] (Technology 11)

[0112] According to the manufacturing method described in Technology 10, the negative electrode can is located on the side opposite to the substrate with respect to the positive electrode can.

[0113] (Technology 12)

[0114] The manufacturing method according to any one of Techniques 8 to 11, wherein the material of the positive electrode can is at least one selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

[0115] The negative electrode can is made of at least one material selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

[0116] (Technology 13)

[0117] A manufacturing method according to any one of techniques 8 to 12, wherein the rotating part is a tire.

[0118] (Technology 14)

[0119] The manufacturing method according to any one of techniques 8 to 12, wherein the rotating part is a rotating part included in factory automation equipment.

[0120] Industrial Applicability

[0121] The present invention can be applied to a rotating body having a device mounted on a rotating part and a method for manufacturing the rotating body.

[0122] Description of Reference Numerals

[0123] 10 rotating part, 50 rotating body, 100 device, 110 substrate, 121, 122 terminals, 140 casing, 160 power receiving unit, 200 flat secondary battery, 210 outer package, 211 positive electrode can, 212 negative electrode can, 213 gasket, 221 positive electrode, 222 negative electrode, 223 spacer, C rotation center.

Claims

1. A rotating body comprising a rotating part configured to rotate around a rotation center, and a device fixed to the rotating part, The device includes a substrate, a power receiving unit, and a flat secondary battery mounted on the substrate. The power receiving unit has a structure for receiving power using electromagnetic induction, The flat secondary battery includes an outer package, and the outer package includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The flat secondary battery is arranged closer to the rotation center than the substrate when viewed from the rotation center of the rotating portion.

2. The rotating body according to claim 1, wherein: The power receiving unit is arranged outside the substrate in the rotating portion when viewed from the rotation center of the rotating portion.

3. The rotating body according to claim 1 or 2, wherein: The positive electrode can faces the substrate.

4. The rotating body according to claim 3, wherein: The negative electrode can is located on a side opposite to the substrate with respect to the positive electrode can.

5. The rotating body according to claim 1 or 2, wherein: The material of the positive electrode can is at least one selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy. The negative electrode can is made of at least one material selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

6. The rotating body according to claim 1 or 2, wherein: The rotating part is a tire.

7. The rotating body according to claim 1 or 2, wherein: The rotating part is a rotating part included in factory automation equipment.

8. A manufacturing method is a manufacturing method of a rotating body, the manufacturing method comprising: A step of preparing a device including a substrate, a power receiving unit, and a flat secondary battery mounted on the substrate; a step of preparing a rotating portion configured to rotate around a rotation center; as well as The step of fixing the device to the rotating part, wherein the power receiving unit has a structure for receiving power using electromagnetic induction, The flat secondary battery includes an outer package, and the outer package includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The step of fixing the device to the rotating portion includes the step of fixing the device to the rotating portion so that the flat secondary battery is arranged closer to the rotation center than the substrate when viewed from the rotation center of the rotating portion.

9. The manufacturing method according to claim 8, wherein: The power receiving unit is arranged outside the substrate when viewed from the rotation center of the rotating portion.

10. The manufacturing method according to claim 8 or 9, wherein: The positive electrode can faces the substrate.

11. The manufacturing method according to claim 10, wherein: The negative electrode can is located on a side opposite to the substrate with respect to the positive electrode can.

12. The manufacturing method according to claim 8 or 9, wherein: The material of the positive electrode can is at least one selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy. The negative electrode can is made of at least one material selected from austenitic stainless steel, two-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and a nickel alloy.

13. The manufacturing method according to claim 8 or 9, wherein: The rotating part is a tire.

14. The manufacturing method according to claim 8 or 9, wherein: The rotating part is a rotating part included in factory automation equipment.

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