JP2008281296A - Electric cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric cooker capable of reducing a size, weight, and cost with excellent usability. <P>SOLUTION: A heater 2, to which power is supplied from a rechargeable battery 6, is prepared in addition to a heater 3 to which power is supplied from a commercial power source 16. When the heater 3 is heated by the power of the commercial power source 16, the heater 2 is heated by the power of the rechargeable battery 6. A temperature necessary for cooking is secured by heat of the heater 2. Then, when a heating temperature of the heater 3 reaches a predetermined temperature, power feed to the heater 2 by the rechargeable battery 6 is stopped, and power feed to the heater 3 only from the commercial power source 16 is continued. A lithium ion secondary battery which can be charged rapidly with a current more than 10C can be used as an incorporated rechargeable battery 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric cooker that can use a commercial power source and a rechargeable battery as a power source.

  2. Description of the Related Art Conventionally, electric cookers used in general households are widely used in which a power cord is connected to a commercial power source and a heater (for example, nichrome wire) is heated by AC power.

  However, those using a commercial power source have a gradual rise in the heating temperature of the heater, and it takes time to rise to the temperature required for cooking. It is said that it is inconvenient when you want to get started.

On the other hand, recently, a rechargeable battery is used as a power source, and power is supplied to the heater by this rechargeable battery. Patent Document 1 discloses a battery that uses a rechargeable battery as a power source for a heating coil. If such a rechargeable battery is used, a power cord is not required at all and cordless is required. Therefore, handling is easy and it can be easily used anywhere without worrying about a power outlet.
JP 2005-149990 A JP-A-2005-123183

  By the way, when such a rechargeable battery is used as a power source, the remaining battery level becomes a problem. If power is continuously supplied to the heater in a state where the remaining battery level is low, the heating temperature of the heater is lowered, which hinders cooking. Will come. For this reason, it is desirable that the rechargeable battery is charged to full charge as soon as the remaining battery level drops to a predetermined value.

  However, the NiCd battery and the nickel metal hydride storage battery used in the electric cooker of Patent Document 1 require a charging time of about 12 hours for normal charging and 2 to 3 hours for quick charging, for example. For this reason, the electric cooker using such a rechargeable battery will be unusable during this period.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric cooker that is easy to use and can be reduced in size and weight.

  According to the first aspect of the present invention, there is provided a cooker body, first heat generating means that is provided in the cooker body and that is supplied with electric power from an AC power supply means and generates heat, and a current of 10 C or more provided in the cooker body. A rechargeable battery that can be rapidly charged, a second heat generating means that is provided in the cooker body and is supplied with electric power from the rechargeable battery and generates heat, and power supply from the AC power supply means to the first heat generating means Power supply to the second heat generating unit by the rechargeable battery is started, and when the heat generation temperature of the first heat generating unit reaches a predetermined value, power supply from the rechargeable battery to the second heat generating unit is performed. And control means for controlling to stop.

  A second aspect of the present invention is characterized in that, in the first aspect, the control means enables power supply to the second heat generating means by the rechargeable battery alone.

  The invention according to claim 3 further comprises charging means according to claim 1 or 2, wherein the charging means is electrically connectable to the rechargeable battery and charges the rechargeable battery in the connected state. It is characterized by having made it possible.

  A fourth aspect of the present invention is characterized in that, in the first or second aspect, the cooker body has a battery remaining amount display means for displaying a remaining battery amount of the rechargeable battery.

  The invention according to claim 5 is the monitoring according to claim 1 or 2, further detecting at least one of overcharge, overdischarge and overcurrent of the rechargeable battery and stopping charging or discharging of the rechargeable battery. It has a protective means.

  According to the present invention, it is possible to provide an electric cooker that is easy to use and that can be reduced in size and weight and reduced in cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
Fig.1 (a) (b) has shown schematic structure of the electric cooker concerning the 1st Embodiment of this invention. 1 (a) and 1 (b), reference numeral 1 denotes a cooker main body. The cooker main body 1 is provided with a placing portion 1a for a cooking utensil (not shown) on the upper surface and a foot portion 1b on the lower surface. It can be placed on a cooking table (not shown).

  The mounting portion 1a is provided with an annular heater 3 as a first heat generating means and an annular heater 2 as a second heat generating means. The heater 2 is disposed at the center of the heater 3. Further, the heater 2 generates heat when DC power is supplied from a rechargeable battery 6 described later. In this case, the heater 2 can increase the heat generation temperature to 200 ° C. or more in about 1 minute by the power from the rechargeable battery 6. The heater 3 generates heat when AC power is supplied from a commercial power source 16 as AC power source means described later. The heaters 2 and 3 are provided with temperature sensors 4 and 5 (only the temperature sensor 4 is shown in FIG. 1) in proximity to each other. The temperature sensor 4 detects the heat generation temperature at the heater 2, and the temperature sensor 5 detects the heat generation temperature at the heater 2.

  A battery chamber 1 c is provided in the rear side surface of the cooker body 1. A rechargeable battery 6 is accommodated in the battery chamber 1c. The battery chamber 1c is provided with a lid (not shown). By opening and closing the lid, the rechargeable battery 6 can be taken in and out of the battery chamber 1c. Details of the rechargeable battery 6 will be described later.

  The cooker body 1 is provided with an operation unit 7. The operation unit 7 is provided with a first switch 8 and a second switch 9. The first switch 8 is, for example, a slide switch that is slidable in a plurality of stages. The first switch 8 constitutes a power switch that supplies AC power of the commercial power supply 16 to a heater control unit 17 to be described later in the first slide operation. The heat generation temperature of the heater 2 can be switched stepwise by the subsequent slide operation. Details of the first switch 8 will be described later. Of course, the first switch 8 may be provided with a power switch and a switch for switching the heat generation temperature of the heater 2 separately.

  The second switch 9 is the same, and constitutes a power switch that supplies DC power of the rechargeable battery 6 to the main control unit 19 described later by the first slide operation, and the heat generation temperature of the heater 3 by the subsequent slide operation. Can be switched in stages. Details of the second switch will be described later. Of course, the second switch 9 may be provided with a power switch and a switch for switching the heat generation temperature of the heater 3 separately.

  The operation unit 7 is provided with a battery remaining amount display unit 10. The battery remaining amount display unit 10 displays the discharge state of the rechargeable battery 6. The rechargeable battery 6 blinks the light emitter when the remaining charge amount of the rechargeable battery 6 is a predetermined value or less, and remains lit during charging. Turns off. For example, an LED is used as the light emitter. In this case, for example, a blue LED may be turned on when the remaining charge amount is equal to or greater than a predetermined value, and a red LED may be turned on when the remaining battery amount falls below a predetermined value.

  In addition, a charger monitoring lamp 11 is arranged in the operation unit 7 alongside the battery remaining amount display unit 10. The charger monitoring lamp 11 blinks a light emitter, for example, when a later-described charging unit 12 fails. For example, an LED is used as the light emitter here.

  A power cord 15 is led out to the cooker body 1. The power cord 15 is provided with an outlet 151 at the tip, and can be connected to a commercial power source 16 to be described later by the outlet 151.

  FIG. 2 shows a circuit configuration of the electric cooker configured as described above. In FIG. 2, the same parts as those in FIG.

  In FIG. 2, reference numeral 16 denotes a commercial power source, and a heater control unit 17 is connected to the commercial power source 16 via the first switch 8. As described above, the first switch 8 is composed of a slide switch, and includes a switch unit 801 that is turned on by the first slide operation and a plurality of switch units 802 and 803 that are turned on by the subsequent slide operation. Have. When the switch unit 801 is turned on, the heater control unit 17 is instructed to start supplying power to the heater 3, and when the switch units 802 and 803 are turned on, the heater control unit performs stepwise switching of the heat generation temperature of the heater 3. 17 is instructed.

  The heater 3 is connected to the heater control unit 17. The heater 3 is connected to a temperature sensor 5 as temperature detecting means. The temperature sensor 5 detects the heat generation temperature of the heater 3 and inputs the detection output to the heater control unit 17 and a main control unit 19 described later.

  The heater control unit 17 compares a specified value set in advance corresponding to the ON operation of the switch units 801 to 803 with the heat generation temperature of the heater 3 detected by the temperature sensor 5, and the temperature detected by the temperature sensor 5 is determined. When the specified value is reached, the power supplied from the commercial power supply 16 to the heater 3 is forcibly turned off, and the heat generation temperature of the heater 3 is controlled to a predetermined temperature.

  On the other hand, the rechargeable battery 6 provided in the cooker body 1 is a lithium ion secondary battery capable of rapid charging. A lithium ion secondary battery is composed of a container made of an exterior member made of an aluminum laminate film and a metal can, a nonaqueous electrolyte housed in the container, and a positive electrode current collector made of aluminum foil and housed in the container. A positive electrode carrying a positive electrode layer containing an oxide as a positive electrode active material, and a negative electrode active material composed of lithium titanate having an average particle size of 1 μm or less in a negative electrode current collector made of aluminum foil and housed in the container And a negative electrode on which a negative electrode layer contained as particles is supported.

  Here, the lithium ion secondary battery will be described in more detail. Such a lithium ion secondary battery includes a negative electrode containing lithium titanium oxide as an active material. As disclosed in Patent Document 2, lithium titanium oxide as an active material is a material capable of inserting and extracting lithium, and insertion / extraction of lithium ions is performed in the vicinity of 1.4 V to 1.7 V / Li. . For this reason, even if the secondary battery is rapidly charged with a large current, it is possible to ensure safety without causing lithium deposition compared to the case where a carbon material is used as a conventional negative electrode active material. In addition, since expansion and contraction associated with insertion and extraction of lithium can be suppressed, structural destruction of the negative electrode active material can be suppressed even when rapid charging with 20 C current is repeatedly performed. As a result, a long life can be maintained even when charging and discharging are repeated. Since the potential of the battery is about 2.4 V, it corresponds to two conventional nickel-metal hydride storage batteries or nickel cadmium storage batteries in series, so that a reduction in use of 50% can be achieved.

  Specifically, it was confirmed that the lithium ion secondary battery assembled by the following method is a fast charge secondary battery that can be charged to about 80% battery capacity by charging at 20 C for 3 minutes. ing. Here, “C” is a unit representing a charge / discharge rate, and a rate that can be calculated in one hour when a constant current charge from full discharge to full charge (or from full charge to full discharge) is calculated is expressed as 1C. In the case of 1/10 hour, it is expressed as 10C. Therefore, for example, 20C charging requires 20 times as much current as 1C charging.

<Production of negative electrode>
As an active material, lithium titanate (Li ₄ Ti ₅ O ₁₂ ) powder having an average particle diameter of 5 μm and an Li storage potential of 1.55 V (vs. Li / Li ⁺ ), and carbon having an average particle diameter of 0.4 μm as a conductive agent. The powder and polyvinylidene fluoride (PVdF) as a binder were blended in a weight ratio of 90: 7: 3, and these were dispersed in an n-methylpyrrolidone (NMP) solvent to prepare a slurry.

  In addition, the laser diffraction type particle size distribution measuring apparatus (Shimadzu Corporation model number SALD-300) was used for the measurement of the particle diameter of an active material. First, about 0.1 g of a sample was put in a beaker or the like, and then a surfactant and 1 to 2 mL of distilled water were added and stirred sufficiently, and poured into a stirred water tank. The light intensity distribution was measured 64 times at intervals of 2 seconds, the particle size distribution data was analyzed, and the particle size (D50) having a cumulative frequency distribution of 50% was defined as the average particle size.

Next, an aluminum foil (purity: 99.99%) having a thickness of 10 μm was applied to the negative electrode current collector, dried, and then pressed to prepare a negative electrode having an electrode density of 2.4 g / cm ³ .

<Preparation of positive electrode>
Lithium cobalt oxide (LiCoO ₂ ) as an active material, graphite powder as a conductive material, and polyvinylidene fluoride (PVdF) as a binder are blended in a weight ratio of 87: 8: 5. -A slurry was prepared by dispersing in a methylpyrrolidone (NMP) solvent. The slurry was applied to an aluminum foil (purity 99.99%) having a thickness of 15 μm, dried, and pressed to prepare a positive electrode having an electrode density of 3.5 g / cm ³ .

<Assembly of secondary battery>
As a forming material for the container (exterior member), an aluminum-containing laminate film having a thickness of 0.1 mm was prepared. The aluminum layer of this aluminum-containing laminate film had a thickness of about 0.03 mm. Polypropylene was used as the resin for reinforcing the aluminum layer. By laminating this laminate film by thermal fusion, a container (exterior member) was obtained and further contained in a metal aluminum container.

  Next, a positive electrode terminal was electrically connected to the positive electrode, and a negative electrode terminal was electrically connected to the negative electrode. A separator made of a polyethylene porous film having a thickness of 12 μm was coated in close contact with the positive electrode. The positive electrode covered with the separator was overlapped with the negative electrode so as to face each other, and these were wound in a spiral shape to produce an electrode group. This electrode group was pressed into a flat shape. An electrode group formed into a flat shape was inserted into a container (exterior member).

LiBF ₄ , which is a lithium salt, is dissolved in an organic solvent in which ethylene carbonate (EC) and γ-butyllactone (GBL) are mixed at a volume ratio (EC: GBL) of 1: 2 to obtain a liquid. A non-aqueous electrolyte was prepared. The obtained nonaqueous electrolyte was poured into the container to assemble a lithium secondary battery. Such a lithium secondary battery can be used at a full charge voltage of 2.8 V and a discharge end voltage of 1.5 V.

  In this embodiment, the rechargeable battery 6 is a lithium ion secondary battery that can be rapidly charged with a current of 10 C or more, and can charge 80% of the battery capacity in 2 to 3 minutes and can be discharged in 2 minutes at 30 C. used.

  The charging unit 12 is connected to the rechargeable battery 6 as a charging unit via the switch 181. The charging unit 12 includes a charging unit main body 13 and an AC / DC converter 14. The AC / DC converter 14 converts AC power supplied from the commercial power supply 16 through the power cord 15 into DC power. The charging unit body 13 charges the rechargeable battery 6 until full charge with the DC power output from the AC / DC converter 14. In addition, a charger monitoring lamp 11 is connected to the charging unit 12. When the charging unit 12 breaks down, the charger monitoring lamp 11 blinks the light emitter and displays the fact. The above-described switch 181 will be described later.

  The rechargeable battery 6 is connected to the main control unit 19 via the second switch 9. Further, a switch 182 is connected to the second switch 9 in parallel.

  The second switch 9 is composed of a slide switch as described above. The second switch 9 includes a switch unit 901 that is turned on by the first slide operation and a plurality of switch units 902 and 903 that are turned on by the subsequent slide operation. Have. Then, the main control unit 19 is instructed to start power supply to the heater 2 by the on operation of the switch unit 901, and the main control unit performs stepwise switching of the heat generation temperature of the heater 2 by the on operation of the switch units 902 and 903. 19 is instructed. The above-described switch 182 will also be described later.

  The main control unit 19 is connected to the heater 2 and the battery remaining amount display unit 10. The heater 2 is provided with a temperature sensor 4 as temperature detection means. The temperature sensor 4 detects the heat generation temperature of the heater 2 and inputs the detection output to the main controller 19.

  The main control unit 19 includes a heater control unit 191, a switch control unit 192, and a battery remaining amount monitoring unit 193. The heater control unit 191 controls the heat generation temperature of the heater 2 according to the ON operation of the switch units 901 to 903. In this case, the heater control means 191 compares the specified value set in advance corresponding to the ON operation of the switch units 901 to 903 with the heat generation temperature of the heater 2 detected by the temperature sensor 4, and is detected by the temperature sensor 4. When the temperature reaches a specified value, the power supplied to the heater 2 from the rechargeable battery 6 is forcibly turned off, and the heat generation temperature of the heater 2 is controlled to a predetermined temperature.

  The switch control unit 192 controls the operation of the above-described switches 181 and 182. When the heater control unit 17 starts supplying power to the heater 3 by the ON operation of the switch unit 801, the switch 182 is turned on and charged. When the power supply to the heater 2 is started from the rechargeable battery 6 and then it is detected from the output of the temperature sensor 5 that the heating temperature of the heater 3 has reached a predetermined value, the switch 182 is turned off and the heater 2 from the rechargeable battery 6 is turned off. Stop power supply to. When power supply from the rechargeable battery 6 to the heater 2 is stopped by turning off the switch 182, the switch 181 is turned on to start charging the rechargeable battery 6 by the charging unit 12, and then a battery remaining amount monitoring described later is performed. When the full charge of the rechargeable battery 6 is detected by the means 193, the switch 181 is turned off to stop the charging by the charging unit 12. Note that the switch 181 can be turned on manually, and the rechargeable battery 6 can be charged by the charging unit 12 by the on operation. In this case, the switch 181 is forcibly turned off by the switch control unit 192 when the battery remaining amount monitoring unit 193 detects that the rechargeable battery 6 is fully charged.

  The battery remaining amount monitoring means 193 monitors the discharge state of the rechargeable battery 6, and when the remaining charge amount becomes a predetermined value or less, the light emitter of the remaining battery amount display unit 10 blinks and continues to be lit during charging. Turns off when complete. In addition, when the charging circuit or the like is broken, the light-emitting body blinks with a buzzer (not shown).

  Although not shown, power for operating the heater control unit 191, the switch control unit 192, and the battery remaining amount monitoring unit 193 of the main control unit 19 is always supplied from the rechargeable battery 6.

  The rechargeable battery 6 is provided with a monitoring protection circuit 20 as monitoring protection means. The monitoring protection circuit 20 monitors the state of the rechargeable battery 6 and stops charging / discharging of the rechargeable battery 6 by driving a switch (not shown) according to the monitoring result. In this case, the monitoring protection circuit 20 monitors overcharge, overdischarge, and overcurrent of the rechargeable battery 6. When the charging voltage of the rechargeable battery 6 is within a predetermined value range, charging / discharging of the rechargeable battery 6 is allowed. When the charging voltage of the rechargeable battery 6 exceeds a predetermined value, it is determined that the battery is overcharged and the switch (not shown) ) Is released to stop the charging of the rechargeable battery 6, and when the charging voltage of the rechargeable battery 6 falls below a predetermined value, it is determined that the battery is overdischarged and the switch (not shown) is opened to open the rechargeable battery 6. Stop the discharge. Further, when the discharge current of the rechargeable battery 6 exceeds a predetermined value, it is determined as an overcurrent, and the switch (not shown) is opened to stop the discharge of the rechargeable battery 6. This prevents the rechargeable battery 6 from being overcharged and generating gas due to the decomposition of the electrolyte, thereby increasing the pressure inside the battery and preventing leakage, and the rechargeable battery 6 is in an overdischarged state. Thus, the copper of the negative electrode current collector is prevented from being dissolved by the electrolytic solution and deteriorating the battery performance. Such a monitoring protection circuit 20 is modularized and used as a unit integrated into the rechargeable battery 6. Note that the monitoring protection circuit 20 may monitor at least one of overcharge, overdischarge, and overcurrent of the rechargeable battery 6.

  Next, the operation of the embodiment configured as described above will be described.

  In using the electric cooker, first, the outlet 151 of the power cord 15 is connected to the commercial power source 16. Next, when the first switch 8 is slid to turn on the switch unit 801, the AC power of the commercial power supply 16 is supplied to the heater 3 by the heater control unit 17, and the heater 3 generates heat.

  When the heater control unit 17 starts supplying power to the heater 3, the switch 182 is turned on by the switch control means 192 of the main control unit 19, and power supply from the rechargeable battery 6 to the heater 2 is also started. As a result, the heater 2 also generates heat. In this case, the heating temperature of the heater 3 to which electric power is supplied from the commercial power supply 16 is moderately increased, whereas the heating temperature of the heater 2 to which the DC power of the rechargeable battery 6 is supplied. Rises quickly and easily reaches the temperature required for cooking. Specifically, the heater 2 increases the heat generation temperature to 200 ° C. or more in about 1 minute. Thereby, the user can start cooking quickly using the heat generated by the heater 2.

  Thereafter, when the heating temperature of the heater 3 rises and reaches a predetermined value, the output of the temperature sensor 5 at this time is sent to the main control unit 19 and the switch 182 is turned off by the switch control means 192. As a result, power supply from the rechargeable battery 6 to the heater 2 is stopped, but cooking is continued using the heat generated by the heater 3 to which power is supplied from the commercial power supply 16. In this case, since the heating temperature of the heater 3 has already reached the temperature required for cooking, the cooking can be continued without any trouble.

  In this case, when the first switch 8 is slid to turn on the switch portions 802 and 803, the heat generation temperature of the heater 3 can be switched stepwise by the on operation of the switch portions 802 and 803.

  When power supply from the rechargeable battery 6 to the heater 2 is stopped by turning off the switch 182, the switch 181 is turned on, the charging unit 12 is connected to the rechargeable battery 6, and the rechargeable battery 6 is charged to full charge. Thereafter, when the battery remaining amount monitoring unit 193 detects that the rechargeable battery 6 is fully charged, the switch 181 is turned off and the charging unit 12 is disconnected from the rechargeable battery 6. In this case, when the rechargeable battery 6 is fully charged, the light emitter of the battery remaining amount display unit 10 is turned off.

  Next, when the electric cooker is used only by the rechargeable battery 6 without using the commercial power source 16, the second switch 9 is slid to turn on the switch unit 901. Then, the power of the rechargeable battery 6 is supplied to the heater 2 by the heater control means 191 of the main control unit 19, and the heat generation temperature of the heater 2 is set to the initial state. In this state, when the second switch 9 is slid to turn on the switch units 902 and 903, the heat generation temperature of the heater 2 can be switched stepwise in accordance with the on operation of the switch units 902 and 903. Thereby, an electric cooker can be used also in the place where the commercial power source 16 is not present.

  The remaining battery charge monitoring unit 193 monitors the remaining battery charge of the rechargeable battery 6. When the remaining battery level falls below a predetermined value, the light emitter of the remaining battery level display unit 10 is blinked. When the user confirms the blinking display of the battery remaining amount display unit 10, the user connects the outlet 151 of the power cord 15 to the commercial power source 16 and manually turns on the switch 181. Thereby, the rechargeable battery 6 is charged by the charging unit 12 until full charge. In this case, when the full charge of the rechargeable battery 6 is detected by the battery remaining amount monitoring means 193, the switch 181 is forcibly turned off by the switch control means 192, and the charging unit 12 is disconnected from the rechargeable battery 6.

  Therefore, in this way, an electric cooker that heats a heater using a commercial power supply has a slow rise in the heating temperature of the heater and takes time to rise to the temperature required for cooking. In addition to the heater 3 to which power is supplied by the commercial power source 16, the heater 2 to which power is supplied by the rechargeable battery 6 is prepared, and when the heater 3 is heated by the power of the commercial power source 16, the rechargeable battery is used. The heater 2 is heated by the electric power of 6 and the temperature required for cooking is ensured by the heat generated by the heater 2 (for example, the heating temperature up to 200 ° C. or more in about 1 minute). When the temperature reached, the power supply to the heater 2 by the rechargeable battery 6 was stopped, and the power supply to the heater 3 was continued only from the commercial power supply 16. As a result, when starting cooking, the temperature necessary for cooking can be easily obtained within a short period of time, so that, for example, it is possible to respond quickly even if you want to start cooking quickly, such as in the morning. Therefore, it is possible to realize an electric cooker with excellent usability.

  The rechargeable battery 6 to be incorporated is also characterized in that a lithium ion secondary battery that can be rapidly charged with a current of 10 C or more is used.

  This eliminates the need for the commercial power source 16 and simplifies carrying, so that it can be used in places where there is no commercial power source 16 such as outdoors. In addition, the above-described lithium ion secondary battery as the rechargeable battery 6 can be quickly charged in a short time, and the rechargeable battery 6 can be repeatedly charged simply by connecting the charging unit 12. Even if it compares with the electric cooker using, stable cooking can be performed without interrupting use for a long time.

  Since the rechargeable battery 6 can be frequently charged, it is possible to use the rechargeable battery 6 having a small battery capacity, and it is possible to reduce the cost as well as to reduce the size and weight of the entire electric cooker. This can be realized by using a rechargeable battery 6 capable of rapid charging.

  The cooker main body 1 is provided with a battery remaining amount display unit 10 for displaying the discharge state of the rechargeable battery 6, so that the discharge state of the rechargeable battery 6 can be confirmed at a glance while using the electric cooker. Thus, it is possible to avoid the situation where the remaining battery level of the rechargeable battery 6 becomes zero and becomes unusable.

  The rechargeable battery 6 is provided with a monitoring protection circuit 20 and is provided with safety measures for detecting abnormalities such as overcharge, overdischarge and overcurrent of the rechargeable battery 6 and stopping charging or discharging of the rechargeable battery 6. Therefore, the rechargeable battery 6 can always be used in a safe state.

  First and second switches 8 and 9 are connected to the heater 3 supplied with power from the commercial power source 16 and the heater 2 supplied with power from the rechargeable battery 6, respectively. Since the exothermic temperature of 2 can be varied step by step, the optimal exothermic temperature for cooking can also be obtained selectively.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. For example, in the above-described embodiment, the first and second switches 8 and 9 are each configured to be slid, but may be configured to rotate. Moreover, although the example which uses only the rechargeable battery 6 accommodated in the battery chamber 1c of the cooker main body 1 was described above, for example, a battery pack having a rechargeable battery with a large capacity is prepared separately. Instead of the rechargeable battery 6 may be connected and used. In this way, the electric cooker can be used for a long time even outdoors. Further, the rechargeable battery 6 is charged by the charging unit 12 connected to the commercial power supply 16, but the charging unit 12 can be connected to the cigarette plug of the automobile, and the rechargeable battery 6 is connected by the charging unit 12 in this state. It may be possible to charge. If it carries out like this, since the rechargeable battery 6 can be easily charged to a full charge from a motor vehicle, an electric cooker can be used also outdoors.

  Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. If the above effect is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

The figure which shows schematic structure of the electric cooker concerning the 1st Embodiment of this invention. The figure which shows the circuit structure of the electric cooker of 1st Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cooker main body, 1a ... Placement part, 1b ... Leg part 1c ... Battery compartment, 2.3 ... Heater 4.5 ... Temperature sensor, 6 ... Rechargeable battery 7 ... Operation part, 8 ... 1st switch 801 DESCRIPTION OF SYMBOLS 803 ... Switch part 9 ... 2nd switch, 901-903 ... Switch part 10 ... Battery residual amount display part, 11 ... Charger monitoring light 12 ... Charging part, 13 ... Charging part main body 14 ... DC converter, 15 ... Power supply Code 151 ... Outlet, 16 ... Commercial power supply 17 ... Heater control unit, 181.182 ... Switch 19 ... Main control unit, 191 ... Heater control means 192 ... Switch control means, 193 ... Battery level monitoring means 20 ... Monitoring protection circuit

Claims (5)

The cooker body,
First heating means provided in the cooker body and supplied with electric power from an AC power supply means to generate heat;
A rechargeable battery capable of being rapidly charged with a current of 10 C or more provided inside the cooker body;
A second heat generating means that is provided in the cooker body and is supplied with electric power from the rechargeable battery and generates heat;
When power supply from the AC power supply means to the first heat generating means is started to supply power to the second heat generating means by the rechargeable battery, and the heat generation temperature of the first heat generating means reaches a predetermined value. An electric cooker comprising: control means for controlling power supply from the rechargeable battery to the second heat generating means to be stopped. 2. The electric cooker according to claim 1, wherein the control means enables power supply to the second heat generating means by the rechargeable battery alone. 3. The electric apparatus according to claim 1, further comprising a charging unit, wherein the charging unit is electrically connectable to the rechargeable battery, and the rechargeable battery can be charged in the connected state. Cooking device. The electric cooker according to claim 1 or 2, wherein the cooker body includes a battery remaining amount display means for displaying a remaining battery amount of the rechargeable battery. The monitoring protection means for detecting at least one of overcharge, overdischarge, and overcurrent of the rechargeable battery, and stopping charging or discharging of the rechargeable battery, according to claim 1 or 2. Electric cooker.

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