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 and a flat secondary battery connected to the substrate via a terminal. The secondary battery includes an outer package, and a positive electrode and a negative electrode disposed in the outer package. The exterior body includes a positive electrode can and a negative electrode can. The secondary battery is disposed such that, when the secondary battery expands due to a high temperature in a charged state of the secondary battery, a can having a large amount of expansion on a central axis of the outer package body, out of the positive electrode can and the negative electrode can, faces the substrate.

Description

Technical Field

[0001] The present invention relates to a rotating body having 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 Publication No. 2011-014453) states, "A method for installing a flat battery, characterized in that it is a method for installing a flat battery used in a device installed on a rotating part and includes a substrate, the flat battery is a battery in which a positive electrode can and a negative electrode can are combined so as to face each other, the substrate and the flat battery are made to face each other, and the substrate and the flat battery are connected via terminals, the side of the positive electrode can and the negative electrode can facing the substrate is set as the side with the smallest deformation caused by swelling when the flat battery expands, and the substrate and the flat battery are buried in a resin."

[0004] Claim 1 of Patent Document 2 (International Publication No. 2017 / 155035) states "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 and a positive electrode with a lithium alloy as an active material."

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2011-014453

[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 subjected to centrifugal force, such as robot arms, surveillance cameras, motors, drills, and tires. The information obtained from sensors located in the 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, as a method of suppressing the detachment of terminals from the substrate and the influence of cracks on the substrate caused by the swelling of the battery, a method of installing the battery on the substrate is proposed in a device installed on the rotating part. The side of the positive electrode can and the negative electrode can facing the substrate is set as the can with the smaller deformation caused by swelling during high-temperature expansion, and the substrate and the flat battery are buried in the resin, without considering the influence of charging and discharging of the secondary battery. In Patent Document 2, a lithium secondary battery using a lithium alloy as the negative electrode active material is proposed as a power source for a tire pressure detection system, but the evaluation is carried out with a single battery. There is no: an actual device is envisioned and the lithium secondary battery is evaluated in a state where the terminal is electrically connected to the substrate.

[0010] 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.

[0011] A rotating body according to one aspect of the present invention comprises a rotating part rotating around a rotation center and a device fixed to the rotating part. The device comprises a substrate and a flat secondary battery connected to the substrate via terminals. The flat secondary battery comprises an outer package, and a positive electrode and a negative electrode arranged in the outer package. The outer package comprises a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The flat secondary battery is configured such that when the flat secondary battery expands due to reaching a high temperature in a charged state, the one of the positive electrode can and the negative electrode can that has a larger expansion amount on the central axis of the outer package faces the substrate.

[0012] In a method for manufacturing a rotating body according to another aspect of the present invention, a rotating part is prepared. A device including a substrate and a flat secondary battery is prepared. The device is fixed to the rotating part. The flat secondary battery is connected to the substrate via a terminal. The flat secondary battery includes an outer packaging body, and a positive electrode and a negative electrode arranged in the outer packaging body. The outer packaging body includes a positive electrode can with a bottom and a negative electrode can with a bottom. The flat secondary battery is configured such that when the flat secondary battery expands due to reaching a high temperature in a charged state of the flat secondary battery, the one of the positive electrode can and the negative electrode can that has a larger expansion amount on the central axis of the outer packaging body faces the substrate.

[0013] According to the present invention, a rotating body to which a device using a flat secondary battery is fixed can be obtained, which is suitable for monitoring the state of a rotating part and has high long-term reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 An example of the device and the rotating part of the first embodiment is schematically shown.

[0015] Figure 2A This is a plan view schematically showing an example of a flat secondary battery used in the device of Embodiment 1.

[0016] Figure 2B Schematically represents the Figure 2A A cross section of the flat secondary battery taken along line IIB-IIB.

[0017] Figure 3 This is a schematic diagram for explaining the amount of expansion of the outer can of a flat secondary battery.

[0018] Figure 4A The configuration of an example of the device according to the first embodiment is schematically shown.

[0019] Figure 4B It is used to illustrate Figure 4A A schematic diagram showing the effect of an example of the device shown.

[0020] Figure 4C The configuration of another example of the device according to the first embodiment is schematically shown.

[0021] Figure 4D The configuration of another example of the device according to the first embodiment is schematically shown.

[0022] Figure 4E The configuration of another example of the device according to the first embodiment is schematically shown. DETAILED DESCRIPTION

[0023] Hereinafter, the embodiments of the present invention will be described with examples, but the present invention is not limited to the examples described below. In the following description, specific numerical values ​​and materials are sometimes exemplified, but other numerical values ​​and materials may also be applied as long as the effect of the present invention can be obtained. In this specification, the description of "numerical value A to numerical value B" includes numerical value A and numerical value B, and may be renamed as "numerical value A or more and numerical value B or less". In the following description, when the lower limit and upper limit of the numerical value of a specific physical property, condition, etc. are exemplified, as long as the lower limit is not above the upper limit, any one of the exemplified lower limits may be arbitrarily combined with any one of the exemplified upper limits. In the following description, when the examples of constituent elements and the examples of methods are listed, as long as there is no special description, only one of the listed examples may be used, or a plurality of the listed examples may be used in combination.

[0024] (Device installed on the rotating part)

[0025] The device of this embodiment is a device installed on a rotating part. Hereinafter, the device is sometimes referred to as "device (D)". Device (D) includes a substrate and a flat secondary battery connected to the substrate via terminals. The flat secondary battery includes an outer packaging body, and a positive electrode and a negative electrode arranged in the outer packaging body. The outer packaging body includes a positive electrode can with a bottom and a negative electrode can with a bottom. The flat secondary battery is configured so that when the flat secondary battery expands due to reaching a high temperature in a charged state, the one of the positive electrode can and the negative electrode can that has a larger expansion amount on the central axis of the outer packaging body faces the substrate.

[0026] In the following, the tank that expands more on the central axis of the outer package when the flat secondary battery expands due to high temperature in the charging state, among the positive electrode tank and the negative electrode tank, is sometimes referred to as "tank A", and the other tank is referred to as "tank B". Tank A is the tank facing the substrate. Tank B is located on the opposite side of the substrate with tank A as a spacing. In the case where the positive electrode tank and the negative electrode tank that expands more on the central axis of the outer package when the flat secondary battery expands due to high temperature in the charging state is the positive electrode tank, the positive electrode tank is tank A and the negative electrode tank is tank B. In the case where the negative electrode tank and the negative electrode tank that expands more on the central axis of the outer package when the flat secondary battery expands due to high temperature in the charging state is the negative electrode tank, the negative electrode tank is tank A and the positive electrode tank is tank B.

[0027] In the case of a primary battery, if it is exposed to a particularly high external temperature in a discharged state, the battery expands. In the case of a secondary battery, there is also expansion caused by changes in the electrodes of charge and discharge, especially when the battery is exposed to a high temperature environment in a fully charged state. Which of the positive and negative electrode tanks is tank A can be determined by comparing the amount of expansion of the tank when the flat secondary battery in a fully charged state is set to a high temperature (a temperature higher than 60°C). Specifically, tank A can be determined by comparing the amount of expansion of the tank when the flat secondary battery in a fully charged state is heated to 60°C. Regarding the temperature, although it depends on the use environment, since the amount of swelling increases at a higher temperature, it is 70°C, 85°C, 105°C, 125°C, and 150°C. It is preferred to compare at a temperature at least 10°C higher than the actual temperature environment. In addition to the temperature of the surrounding environment, the temperature of the rotating part in the device will also increase due to rotation, friction, etc. If it is continuously operated, the temperature will rise due to the accumulation of heat. For factory automation equipment (FA equipment), if it is in a human environment, the ambient temperature is up to about 40°C, and if it is used continuously, the temperature of the device reaches 70°C or 85°C. In addition, in an unmanned environment and under special circumstances, it may reach 105°C, 125°C, or 150°C. For example, a drill bit can be considered. In the case of tires, it may also reach 105°C, 125°C, or 150°C depending on the road surface temperature and the state of rotation. As for the continuous time, the tire is much shorter than the factory automation equipment (FA equipment).

[0028] In a flat secondary battery, if the expansion of the outer can (positive electrode can and negative electrode can) increases, the electrical contact between the electrode and the inside of the outer can becomes insufficient, the resistance increases, and the battery characteristics deteriorate significantly, such as the discharge capacity decreases and the discharge current characteristics decreases due to insufficient charging. In the device (D), the can A with a large expansion amount is made to face the substrate. Therefore, when the can A expands, the part of the can A that expands the most will not swell further in the thickness direction after contacting the substrate, so that the expansion of the can A can be suppressed by the substrate. Since the substrate has sufficient strength, deformation and cracking of the substrate will not occur. In addition, due to changes over time, there are also cases where the area of ​​contact between the substrate and the can A increases. As a result, the electrical contact between the electrode and the inside of the outer can is maintained, and the degradation of the battery characteristics can be suppressed. In addition, there is no influence on the part connected to the above-mentioned substrate via the terminal due to the expansion of the battery, and the connection part will not be detached. In the structure of Patent Document 1, since the battery is embedded in resin, the volume of the swollen part of the battery directly deforms the resin, and the force is concentrated on the connection between the terminal and the substrate, which is a weak part, causing separation. In the present invention, unlike Patent Document 1, the battery and the substrate are not embedded in resin without a gap, so while allowing the volume change caused by the swelling of the battery, it also has the effect of suppressing swelling. As a result, a rotating body with a device with high reliability for a long time can be realized.

[0029] The can A may be pressed via other members (eg, terminals, double-sided tape for fixing) disposed between the can A and the substrate.

[0030] In device (D), since no resin is disposed between the flat secondary battery and the substrate, the heat conductivity from the surrounding environment is reduced, and the influence of thermal shock caused by temperature change on the flat secondary battery can be alleviated, which is preferred. In addition, the manufacturing cost can also be reduced.

[0031] The flat secondary battery (more specifically, the bottom surface of the can A or the terminal connected to the can A) may be in contact with the substrate. Alternatively, a certain gap (space) may be provided between the flat secondary battery and the substrate when the can A is not expanded. However, if the gap is too large (for example, the gap is provided at a level greater than the maximum expansion amount of the can A), it may affect the separation of the terminal and the substrate, which is not preferred.

[0032] For a flat secondary battery, it can be arranged on the outside of the substrate when viewed from the rotation center of the rotating part. Since the centrifugal force from the battery on the substrate due to the rotation of the rotating part becomes smaller, the influence on the substrate and the connection between the terminal and the substrate becomes smaller than that on the inside, which is more preferred. According to this structure, since the weight of the flat secondary battery is the largest among the components mounted on the substrate, the electronic components can be arranged on the surface on the side of the rotation center among the two surfaces of the substrate, and the influence on the substrate and other electronic components is also reduced. Therefore, long-term reliability is further improved.

[0033] 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 and machine tools include factory automation equipment (FA equipment) and other manufacturing machines.

[0034] 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), a tire monitoring system (TMS) that monitors the temperature inside the tire, the acceleration of the tire, and other monitoring in addition to the pressure. According to these purposes, the device (D) includes necessary electronic components such as sensors.

[0035] 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.

[0036] 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.

[0037] 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 rotation speed 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.

[0038] 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.

[0039] The device (D) may further include a shell covering the flat secondary battery. The shell may suppress the flat secondary battery from expanding in a direction away from the substrate. That is, the shell may be configured to suppress the flat secondary battery from expanding in a direction away from the substrate. There may be no space or there may be space between the shell and the flat secondary battery or the terminal.

[0040] In the device (D), at least a part or all of the electronic components may be arranged on the side of the two sides of the substrate where the flat secondary battery is not arranged. According to such an arrangement, the device (D) can be miniaturized and lightweight. In the case where the device (D) is installed on a rotating part, the miniaturization and lightweight of the device are particularly important from the perspective of the balance of the rotating part. Of course, at least a part or all of the electronic components may also be arranged on the same side as the flat secondary battery.

[0041] (Method of installing a flat secondary battery)

[0042] The installation method of the present embodiment is an installation method for a flat secondary battery used in a device installed on a rotating part including a substrate. 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 flat secondary battery is connected to the substrate via a terminal. The flat secondary battery includes an outer packaging body, and a positive electrode and a negative electrode arranged in the outer packaging body. The outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The flat secondary battery is configured so that when the flat secondary battery expands due to reaching a high temperature in the charged state of the flat secondary battery, the side (tank A) of the positive electrode can and the negative electrode can that has a larger expansion amount on the central axis of the outer packaging body faces the substrate.

[0043] 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.

[0044] 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).

[0045] (Flat secondary battery)

[0046] 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.

[0047] 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. Matters other than those required in the embodiment of the present invention are not particularly limited, and known structures and components may be applied.

[0048] 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.

[0049] Lithium metal or lithium alloy can also be used as the negative electrode active material. However, when lithium metal is used, the capacity reduction caused by dendrite formation is likely to occur. 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 likely to be 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 Ti 1.6 (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.

[0050] 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.

[0051] 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.

[0052] 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 in between, 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. There is no special limitation on the materials of the positive electrode tank, the negative electrode tank and the gasket, and the known materials used by each can be used. 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 materials can also be used.

[0053] The material of the positive electrode tank and the material of the negative electrode tank can be made of metal cladding materials such as iron, stainless steel, aluminum and iron, aluminum and stainless steel, iron and copper, stainless steel and copper, or iron, stainless steel, metal cladding, etc., with nickel plating applied to the surface. In addition, each can also be independently selected from at least one of austenitic stainless steel, 2-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and nickel alloy. The material of the positive electrode tank and the material of the negative electrode tank can be the same or different from each other. These austenitic stainless steel, 2-phase stainless steel consisting of austenitic stainless steel and ferritic stainless steel, and nickel alloy materials are weaker in magnetism than other materials. In the case of charging a flat secondary battery by wireless power supply using electromagnetic induction such as magnetic field resonance and magnetic field coupling, by using an outer packaging tank (positive electrode tank and negative electrode tank) composed of a material with weak magnetism, it is possible to suppress the heating of the outer packaging tank by the magnetic flux supplied by wireless power supply. As a result, it is possible to suppress the deterioration of the flat secondary battery caused by temperature rise.

[0054] 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.

[0055] The tank A is disposed so as to face the substrate. The bottom surface of the tank A 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.

[0056] (Substrate)

[0057] 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. In order to suppress the expansion of tank A, the substrate preferably has high strength. From this point of view, the thickness of the substrate is preferably greater than 0.1 mm (for example, in the range of 0.1 to 2 mm). Examples of materials for the substrate include paper, resin, glass, and ceramics. The substrate can be constructed using at least one of these materials. In addition, from the perspective of increasing the strength of the substrate, it is preferred to use a material in which glass is added to the resin. The substrate includes wiring.

[0058] (Electronic components other than flat secondary batteries, etc.)

[0059] 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, power generating elements, transmission units, processing units, etc. Electricity is supplied to these electronic components from the flat secondary battery as needed.

[0060] Examples of sensors include sensors for monitoring position, pressure sensors, acceleration sensors, and temperature sensors. For example, pressure sensors are used to monitor the pressure in a tire. The transmitting unit is a component for transmitting various information (such as information obtained by a sensor) 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.

[0061] 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.

[0062] The flat secondary battery of the device (D) can be charged by wireless power supply. For example, 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. In this case, a power transmission unit (coil, antenna, etc.) for wireless power supply is arranged on a mechanical body (car body, FA equipment, etc.), and the device (D) includes a power receiving unit. The power receiving unit is a part that generates electricity, for example, by electromagnetic induction. Examples of the power receiving unit include coils and antennas. The flat secondary battery of the device (D) can also be charged by a power generating element. Examples of power generating elements include piezoelectric elements that generate electricity by vibration, Peltier elements that generate electricity by temperature difference, etc.

[0063] (terminal)

[0064] 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.

[0065] (case)

[0066] The device (D) may include a housing surrounding the flat secondary battery. The housing may surround a portion of the device (D) or the entire device (D). However, in the case of charging the flat secondary battery by wireless power supply, the housing is selected so as to enable wireless power supply. The housing is not particularly limited, and a housing made of metal and / or resin may be used.

[0067] 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.

[0068] (Implementation method 1)

[0069] 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. It should be noted that Figure 1 , only the outer edge of the rotating part 10 is shown. The rotating body 50 includes the rotating part 10 and the device 100 fixed to the rotating part 10.

[0070] 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. Figure 2A and Figure 2B The central axis CA of the secondary battery 200 is shown in FIG.

[0071] 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.

[0072] 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 portion of the cylindrical portion of the negative electrode can 212 is arranged inside the cylindrical portion of the positive electrode can 211 .

[0073] 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.

[0074] A side view schematically shows an example of a state in which the positive electrode can 211 and the negative electrode can 212 are expanded. Figure 3 middle. Figure 3 The dotted line indicates the position of the bottom surface of the outer packaging can before expansion. Figure 3 The dotted line indicates the position of the bottom surface of the outer can of the secondary battery 200 at room temperature (25° C.) It should be noted that the outer can may be slightly expanded in the initial state. Figure 3 , the central axis CA of the cylindrical outer package 210 is shown. It should be noted that the central axis CA is considered to be consistent with the central axis of the bottomed cylindrical positive electrode can 211 and the central axis of the bottomed cylindrical negative electrode can 212. Therefore, the central axis CA of the outer package 210 can be regarded as the central axis of the positive electrode can 211 and the central axis of the negative electrode can 212.

[0075] The expansion amount Ep of the positive electrode can 211 on the central axis CA can be obtained by measuring the displacement of the bottom surface 211b of the positive electrode can 211 (displacement along the central axis CA). Figure 3 The displacement of the bottom surface 211b of the positive electrode can 211 when the secondary battery expands due to high temperature in the charged state can be obtained. Similarly, the expansion amount En of the negative electrode can 212 on the central axis CA can be obtained by measuring the displacement of the bottom surface 212b of the negative electrode can 212 (displacement along the central axis CA). Specifically, the expansion amount En can be obtained by measuring the displacement of the bottom surface 212b of the negative electrode can 212 relative to the central axis CA. Figure 3 The displacement of the bottom surface 212b of the negative electrode can 212 when the secondary battery expands due to high temperature in the charged state is obtained from the reference position indicated by the dotted line.

[0076] An example of the configuration and arrangement of the device 100 is schematically shown in Figure 4A It should be noted that, in the following figures, some hatching is omitted for easy viewing of the drawings. In addition, in the following figures, only a part of the outline of the outer edge of the rotating portion 10 is shown. Figure 4A The can A with the largest expansion amount is the positive electrode can 211, and the secondary battery 200 is arranged inside the substrate 110 when viewed from the rotation center C of the rotating part 10, that is, the secondary battery 200 is arranged closer to the rotation center C than the substrate 110. The rotating part 10 is configured to rotate around the rotation center C.

[0077] Reference Figure 4A The device 100 includes a substrate 110 , terminals (lead terminals) 121 and 122 , a housing 140 , and a flat secondary battery 200 .

[0078] The housing 140 surrounds the secondary battery 200 and functions as an outer package of the device 100. The secondary battery 200 is welded to the electrical wiring of the substrate 110 using the terminal 121 connected to the positive electrode can 211 and the terminal 122 connected to the negative electrode can 212. It should be noted that the shapes of the terminals 121 and 122 and the connection positions with the outer package can are not limited to Figure 4A Example shown.

[0079] exist Figure 4A In the example shown, the secondary battery 200 is arranged on the inner side of the substrate 110 when viewed from the rotation center C of the rotating portion 10, that is, the secondary battery 200 is arranged closer to the rotation center C than the substrate 110. The secondary battery 200 is arranged so that the positive electrode can 211 faces the substrate 110. That is, the bottom surface of the negative electrode can 212 is arranged on the side closer to the rotation center C than the bottom surface of the positive electrode can 211, that is, closer to the rotation center C.

[0080] for Figure 4A In the example shown, the state of the secondary battery 200 when expanded is schematically shown in FIG. Figure 4B When the positive electrode can 211 expands, the positive electrode can 211 (specifically, the bottom surface of the positive electrode can 211) hits the substrate 110 and is pressed by the substrate 110. As a result, the expansion of the positive electrode can 211 with a large expansion amount can be suppressed by the substrate 110, so that the deterioration of the secondary battery 200 and the separation of the terminal from the substrate due to the expansion of the outer can can be suppressed.

[0081] Another example of the configuration and arrangement of the device 100 is schematically shown in Figure 4C middle. Figure 4C The tank A with the largest expansion amount is shown as the positive electrode tank 211, and the secondary battery 200 is arranged outside the substrate 110 when viewed from the rotation center C of the rotating part 10. Figure 4C The shape shown and Figure 4A The illustrated forms are the same, so repeated descriptions are omitted.

[0082] according to Figure 4C In the configuration shown, since the substrate 110 can suppress the expansion of the positive electrode can 211 having a large expansion amount, it is possible to suppress the deterioration of the secondary battery 200 and the separation of the terminal from the substrate due to the expansion of the outer can.

[0083] Another example of the configuration and arrangement of the device 100 is schematically shown in Figure 4D middle. Figure 4D The tank A with the largest expansion amount is shown as the negative electrode tank 212, and the secondary battery 200 is arranged inside the substrate 110 when viewed from the rotation center C of the rotating part 10. Figure 4D The shape shown and Figure 4A The illustrated forms are the same, so repeated descriptions are omitted.

[0084] according to Figure 4DIn the configuration shown, since the negative electrode can 212 with a large expansion amount can be suppressed by the substrate 110 , it is possible to suppress the deterioration of the secondary battery 200 and the separation of the terminal from the substrate due to the expansion of the outer can.

[0085] Another example of the configuration and arrangement of the device 100 is schematically shown in Figure 4E middle. Figure 4E The tank A with the largest expansion amount is shown as the negative electrode tank 212, and the secondary battery 200 is arranged outside the substrate 110 when viewed from the rotation center C of the rotating part 10. Figure 4E The shape shown and Figure 4D The illustrated forms are the same, so repeated descriptions are omitted.

[0086] according to Figure 4E In the configuration shown, since the negative electrode can 212 with a large expansion amount can be suppressed by the substrate 110 , it is possible to suppress the deterioration of the secondary battery 200 and the separation of the terminal from the substrate due to the expansion of the outer can.

[0087] In Patent Document 1, the outer packaging can on the side with the smaller deformation caused by swelling during expansion faces the substrate, and the substrate and the flat battery are embedded in resin, thereby fixing and reducing the volume change at the connection part between the substrate and the terminal. Since the expansion amount is larger than that of the primary battery when applied to the secondary battery, the expansion amount cannot be allowed in Patent Document 1, and cracks in the resin and the substrate occur, and the terminal is separated from the substrate, and it cannot be used for a long time.

[0088] (Note)

[0089] Based on the above description, the following technology is disclosed.

[0090] (Technique 1)

[0091] A rotating body comprises a rotating part rotating around a rotation center and a device fixed to the rotating part.

[0092] The device includes a substrate and a flat secondary battery connected to the substrate via a terminal.

[0093] The flat secondary battery includes an outer package, and a positive electrode and a negative electrode disposed in the outer package.

[0094] The outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can.

[0095] The flat secondary battery is configured such that when the flat secondary battery expands due to reaching a high temperature in a charged state, the one of the positive electrode can and the negative electrode can that expands more on the central axis of the outer packaging body faces the substrate.

[0096] (Technique 2)

[0097] According to the rotating body described in the first aspect, the flat secondary battery is arranged outside the substrate when viewed from the rotation center of the rotating portion.

[0098] (Technique 3)

[0099] The rotating body according to technology 1 or 2, wherein the rotating part is a tire.

[0100] (Technique 4)

[0101] According to the rotating body described in technology 1 or 2, the above-mentioned rotating part is a rotating part included in factory automation equipment.

[0102] (Technique 5)

[0103] The rotating body according to any one of the techniques 1 to 4, further comprising a casing covering the flat secondary battery,

[0104] The case prevents the flat secondary battery from expanding in a direction away from the substrate.

[0105] (Technique 6)

[0106] A method for manufacturing a rotating body, the manufacturing method comprising:

[0107] Steps for preparing the rotating part;

[0108] a step of preparing a device including a substrate and a flat secondary battery; and

[0109] The step of fixing the device to the rotating part,

[0110] wherein the flat secondary battery is connected to the substrate via a terminal,

[0111] The flat secondary battery includes an outer package, and a positive electrode and a negative electrode disposed in the outer package.

[0112] The outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can.

[0113] The flat secondary battery is configured such that when the flat secondary battery expands due to reaching a high temperature in a charged state, the one of the positive electrode can and the negative electrode can that expands more on the central axis of the outer packaging body faces the substrate.

[0114] (Technique 7)

[0115] According to the manufacturing method described in technology 6,

[0116] The rotating part is configured to rotate around a rotation center.

[0117] 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 outside the substrate when viewed from the rotation center of the rotating portion.

[0118] (Technique 8)

[0119] According to the manufacturing method described in technology 6 or 7, the above-mentioned rotating part is a tire.

[0120] (Technique 9)

[0121] According to the manufacturing method described in technology 6 or 7, the above-mentioned rotating part is a rotating part included in factory automation equipment.

[0122] (Technology 10)

[0123] The manufacturing method according to any one of Techniques 6 to 9, wherein the device further comprises a casing covering the flat secondary battery,

[0124] The case prevents the flat secondary battery from expanding in a direction away from the substrate.

[0125] Industrial Applicability

[0126] The present invention can be applied to a rotating body having a device mounted on a rotating portion, and a method for manufacturing the rotating body.

[0127] Description of Reference Numerals

[0128] 10 rotating part, 50 rotating body, 100 device, 110 substrate, 121, 122 terminals, 140 casing, 200 secondary battery (flat secondary battery), 210 outer package, 211 positive electrode can, 212 negative electrode can, 213 gasket, 221 positive electrode, 222 negative electrode, CA center axis.

Claims

1. A rotating body comprising a rotating part rotating around a rotation center and a device fixed to the rotating part, The device includes a substrate and a flat secondary battery connected to the substrate via a terminal, The flat secondary battery includes an outer package, and a positive electrode and a negative electrode disposed in the outer package. The outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The flat secondary battery is configured such that when the flat secondary battery expands due to reaching a high temperature in a charged state, one of the positive electrode can and the negative electrode can that expands more on the central axis of the outer package faces the substrate.

2. The rotating body according to claim 1, wherein: The flat secondary battery is arranged outside the substrate when viewed from the rotation center of the rotating portion.

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

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

5. The rotating body according to claim 1 or 2, further comprising a casing covering the flat secondary battery, The case suppresses expansion of the flat secondary battery in a direction away from the substrate.

6. A method for manufacturing a rotating body, the method comprising: Steps for preparing the rotating part; a step of preparing a device including a substrate and a flat secondary battery; as well as The step of fixing the device to the rotating part, wherein the flat secondary battery is connected to the substrate via a terminal, The flat secondary battery includes an outer package, and a positive electrode and a negative electrode disposed in the outer package. The outer packaging body includes a bottomed cylindrical positive electrode can and a bottomed cylindrical negative electrode can. The flat secondary battery is configured such that when the flat secondary battery expands due to reaching a high temperature in a charged state, one of the positive electrode can and the negative electrode can that expands more on the central axis of the outer package faces the substrate.

7. The manufacturing method according to claim 6, wherein: The rotating part is configured to rotate around a rotation center, 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 outside the substrate as viewed from the rotation center of the rotating portion.

8. The manufacturing method according to claim 6 or 7, wherein: The rotating part is a tire.

9. The manufacturing method according to claim 6 or 7, wherein: The rotating part is a rotating part included in factory automation equipment.

10. The manufacturing method according to claim 6 or 7, wherein: The device further includes a housing covering the flat secondary battery, The case suppresses expansion of the flat secondary battery in a direction away from the substrate.

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