EP3851745A1 - Festbrennstoffmaterialvorrichtung zur wärmeerzeugung - Google Patents

Festbrennstoffmaterialvorrichtung zur wärmeerzeugung Download PDF

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Publication number
EP3851745A1
EP3851745A1 EP20217952.9A EP20217952A EP3851745A1 EP 3851745 A1 EP3851745 A1 EP 3851745A1 EP 20217952 A EP20217952 A EP 20217952A EP 3851745 A1 EP3851745 A1 EP 3851745A1
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EP
European Patent Office
Prior art keywords
outer casing
combustion chamber
solid fuel
heat
fuel material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20217952.9A
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English (en)
French (fr)
Inventor
Marco Franceschet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eva Stampaggi Srl
Original Assignee
Eva Stampaggi Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eva Stampaggi Srl filed Critical Eva Stampaggi Srl
Publication of EP3851745A1 publication Critical patent/EP3851745A1/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/02—Closed stoves
    • F24B1/024—Closed stoves for pulverulent fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/188—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas  
    • F24B1/1885—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas   the heat exchange medium being air only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/34—Elements and arrangements for heat storage or insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
    • F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
    • F24H7/04—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid
    • F24H7/0475—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using solid fuel
    • F24H7/0483—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using solid fuel the transfer fluid being air

Definitions

  • the current invention is part of the heating of environments attended by people, typically dwellings, and, in particular, concerns a solid fuel material apparatus, such as pellets, coal, wood and/or wood chips, basically though not exclusively of the storage type and intended for the generation of heating heat.
  • a solid fuel material apparatus such as pellets, coal, wood and/or wood chips
  • a heating apparatus such as a tiled stove (commonly known as “Tyrolean stube”)
  • a tiled stove commonly known as "Tyrolean stube”
  • accumulation stove built of refractory material and covered in majolica that heats by irradiation the air of a confined environment, such as a living room or a room of a dwelling, unlike other stoves that heat the environment concerned by convection.
  • the heat produced by the fire in the combustion chamber accumulates, indeed, in the refractory material with which the stove is built and coated and is subsequently released into the environment gradually, in a time frame generally varying between 5 hours and 8 hours.
  • accumulation stoves do not require continuous feeding of fuel material but are usually turned on once or twice a day.
  • a typical accumulation heating apparatus has been for years an aesthetic nature connotation, acting not only as a functional device but also as a furnishing element of the environment in which it is installed, and this because of the materials with a pleasant impact, and often value, with which is finished and covered.
  • a well-known accumulation heating apparatus consists internally of three main components: the combustion chamber where the solid fuel material (such as wood or pellets) to be burned is placed, where the latter is combusted by a burner member and whose volume is directly proportional to the thermal power of the same, a heat exchanger (such as, in general, a coil) having a variable section and built of refractory material through which the fume coming from the combustion passes and a coating surface made of majolica tiles.
  • the combustion chamber where the solid fuel material (such as wood or pellets) to be burned is placed, where the latter is combusted by a burner member and whose volume is directly proportional to the thermal power of the same
  • a heat exchanger such as, in general, a coil having a variable section and built of refractory material through which the fume coming from the combustion passes and a coating surface made of majolica tiles.
  • the fumes produced by the combustion enter the coil with a temperature of about 600°C to exit at a temperature of about 150°C ⁇ 120°C.
  • the coil may have a horizontal development, in which the height of the planes decreases as it departs from the combustion chamber, and similarly decreases the thickness of the dividers, or vertical, in which the size of the vertical channels decreases with the path followed by the fumes, and similarly decreases the thickness of the dividers.
  • prior art storage heating equipment equipped with vertical serpentines doesn't require periodic but cadenced opening manoeuvres to perform cleaning, as their inner volume gets much less dirty than equipment provided with horizontal serpentines, even considering the fact that, normally, soot falls to their bottom.
  • a storage heating apparatus (more commonly called a stove, as yet mentioned), supplied by solid fuel material such as pellets, is also traditionally composed of the following components:
  • the accumulation stove presents a simple and mechanical operation that allows to balance the speed of feeding of the solid fuel material both with the supply of air and with the expulsion of fumes and with the ignition of the flame.
  • the screw picks up the fuel and releases it inside the hearth, dosing the necessary amount; here, forced air allows to mix in a balanced way the fuel with the oxidant, so as to turn it into heat.
  • the convention air is eventually forced by the centrifugal fan, so as to exchange with the heat produced by the combustion.
  • the fumes produced by combustion and conveyed into the heat exchanger are ejected by the centrifugal fan located downstream the operating sequence.
  • This process is monitored by an electric central processing and control unit that is installed inside a control panel applied to the outer casing and that allows to supersede the operation of the various components, as well as to set the ideal temperature of the heat produced and released into the environment, the time of switching on and off.
  • a second drawback of known solid fuel heating apparatuses of the heat accumulation type is that the refractory material used for the thermal storage with which they're made presents a thermal inertia, once the heating apparatuses have been switched off, rather limited in time.
  • the predetermined shape of the blocks of the thermal storage material requires the equipment be designed according to precise, fixed, standardized, little flexible and substantially non-customizable choices - the stove described in WO2015/121848 A1 has a rather articulated construction design, dictated not above all by the specific composition of the thermal storage material.
  • the prior document DE3710014 A1 shows that the preformed elements 1 presenting a cavity (reference number 2) filled with refractory material, as quartz sand or gravel, are arranged at two opposite side walls (numerical reference 6) of the stove, outside the combustion chamber (numerical reference 4) from which they are separated and spaced apart at least by the cavity housing some springs (numerical reference 7).
  • reference number 2 a cavity filled with refractory material, as quartz sand or gravel
  • main purpose of the present invention is to provide a solid, usually but not limited pellets, fuel apparatus for heating heat generation, of the so-called "accumulation" type, which, compared to the known art, allows to increase the range of aesthetic forms obtainable, made available to the end user.
  • a solid fuel apparatus for heat generation of the so-called "accumulation" type, which allows to decoupling the construction form of the apparatus itself from the design of the components in refractory material that distinguish it, in particular not only from the covering and finishing tiles, applied to at least part of the outer surface of the outer casing (or load-bearing frame) of the accumulation heating apparatus, but also from the components intended for the thermal storage.
  • a solid fuel material or solid biomass such as pellets, wood, coal and/or wood chipped material apparatus (or even storage stove) for heat generation, of the so-called “accumulation" type, according to the appended claim 1, as hereinafter referred for the sake of exhibition brevity.
  • the solid fuel material preferably pellets in the form of small thickened and pressed cylinders, apparatus (commonly also known as accumulation stove) used for heat generation and qualified as "at heat storage", object of the present invention, allows to free the shape with which it's built by the stringent constraint currently represented by the shape of the refractory material used to make its components suitable for heat accumulation, in particular the finishing covering (for instance tiles) of at least part of the outer surface of the outer support and containment casing.
  • the finishing covering for instance tiles
  • the accumulation heating equipment of the current invention includes an auxiliary heat storage chamber, at least partly filled with grainy, sandy or dusty refractory material and at least partly in direct thermal contact with the combustion chamber: the auxiliary heat storage chamber is suitable to release, at least by irradiation, into a confined external environment, including the reference surface on which the outer casing of the apparatus rests, the heat accumulated in the auxiliary chamber through the contact with the combustion chamber.
  • the solid fuel material accumulation heating apparatus of the invention presents, the combust material being equal, thermal inertia (or dispersion) of heat release in the external environment to be heated greater - in the sense of longer - than that one provided by equivalent heating apparatuses of known type, thanks not only to the grainy, dusty or sandy nature of the refractory material used in the invention apparatus but also to the direct contact between the auxiliary heat storage chamber and the combustion chamber in at least one of their boundary walls which, preferably, is in common with each other.
  • such an auxiliary heat storage chamber is monobloc and, again preferably, made of metallic material (the same as the combustion chamber and the heat-exchange - or conveying of the combustion fumes - circuit).
  • the auxiliary heat storage chamber is one and unique (in other words monobloc), and presents at least one boundary wall in common with the combustion chamber, so that there is no interstitial air gap between said combustion chamber and said auxiliary heat storage chamber, at such a common boundary wall, as it is the case in those two prior documents.
  • the solid fuel material heat accumulation heating apparatus of the invention presents an assembly simpler than that one of the equivalent apparatus of the prior art, thanks, for instance, to provide the simple introduction of grainy or sandy or dusty refractory material into the auxiliary heat storage chamber and the application of covering and finishing materials on the outer surface of the outer casing of simple type, not necessarily in majolica that, as known, require a lot of attention (especially in the leaks) during installation.
  • the use of grainy or sandy or dusty refractory material allows, in the invention, the (partial or complete) filling of the auxiliary heat storage chamber directly on site, at the time of installation of the heating apparatus of the invention at the end user where the grainy or sandy or dusty refractory material is delivered, preferably, separate (or apart) from the apparatus itself, resulting in a reduction in weight of the latter during transport and handling and, ultimately, of the physical efforts operators must perform to move it before its final installation.
  • the heat accumulation heating apparatus of the invention operating with solid fuel material (such as typically but not exclusively a woody biomass pressed and in the shape of chips, typically pellets) and useful for producing usually domestic heating heat, is illustrated in figures 1 and 2 where it is globally numbered with 1.
  • solid fuel material such as typically but not exclusively a woody biomass pressed and in the shape of chips, typically pellets
  • pellet indeed, is first and foremost economical, has a very high yield in terms of life and heat compared to other types of fuel material.
  • pellet does not dirty, leaves no dust or reassurances since it's compact and is sold in comfortable dirty-saving packages; moreover, when burned, it leaves very few combustion residues thus allowing the heating system of the stove to always work optimally and to not continuously force the ash to be removed from the brazier.
  • pellet is environmentally friendly, as it is made only of natural materials mainly from woodworking waste, it does not contain chemicals and is a renewable energy source that also helps to limit exploitation of forests, because it allows to prefer chips and sawdust to the trees that can be obtained from them.
  • pellet is considered a biomass, having twice the energy density of wood and generating low CO 2 and NOX emissions.
  • the heating apparatus 1 of the heat accumulation and solid fuel material type, comprises:
  • the apparatus 1 also includes an auxiliary heat storage chamber 6, filled (in this case totally and preferably) with grainy or sandy or dusty refractory material and, always in this case, in direct thermal contact with the combustion chamber 4 without any interposition neither of components nor of chambers or air interstices in at least one boundary stretch 18 of the side wall 19: the grainy or sandy or dusty refractory material, not represented for exhibition simplicity, presents the function of resisting the high temperatures (which can also reach 200 ⁇ 300 °C outside the combustion chamber and in the combustion fumes) that develop inside the solid fuel apparatus 1 and to allow the auxiliary storage chamber 6 to release, at least by progressive irradiation, in a confined external environment (including the reference surface S and attended by people) the heat accumulated in it through the contact with the combustion chamber 4.
  • the grainy or sandy or dusty refractory material not represented for exhibition simplicity, presents the function of resisting the high temperatures (which can also reach 200 ⁇ 300 °C outside the combustion chamber and in the combustion fumes) that develop inside the solid fuel apparatus
  • the auxiliary heat storage chamber 6 and the combustion chamber 4 have a boundary stretch 18 of the respective side wall 19, 20 in common with each other: in other words, the side wall 19 of the auxiliary heat storage chamber 6 has a boundary stretch 18 in common with the side wall 20 of the combustion chamber 4.
  • the auxiliary heat storage chamber 6 is defined in the outer casing 2 (thus being appropriately delimited, in this case, by a side wall made of metallic material) and is equally suitably arranged (in this executive solution only in part) directly adjacent to, and in physical contact with, the combustion chamber 4 at the boundary stretch 18.
  • the auxiliary heat storage chamber 6 is defined inside the outer casing 2 without creating, advantageously, a special structure for it but taking advantage of some boundary stretches of the side walls 19, 20 of some elements of the heat accumulation apparatus (or stove) 1 of the invention, such as mainly and at least the outer casing 2 and the combustion chamber 4 and, subject to, the overall conveying and heat-exchange circuit indicated with 7 and better described later.
  • the auxiliary storage chamber 6 is, in this case, arranged laterally to the combustion chamber 4, observing frontally the heating apparatus 1 when placed in application conditions, installed in the environment to be heated, while it is understood that, in other embodiments of the invention, not illustrated in the attached figures, the auxiliary storage chamber could be installed posteriorly or superiorly to the combustion chamber (however always adjacent to it and distinguished by it).
  • auxiliary storage chamber is a separate component from the outer casing, permanently coupled to it by stable junction means, such as screw means or one more welding sections/points.
  • the auxiliary heat storage chamber 6 is a monoblock (or monolithic piece) that develops dimensionally along a mainly vertical linear axis Y.
  • the grainy or sandy or dusty refractory material occupies in this case substantially 100% of the volume 6a of the auxiliary heat storage chamber 6, although it is understood that in alternative embodiments of the heating apparatus of the heat accumulation type of the invention, not accompanied in the following by reference figures, the refractory material of grainy or sandy or dusty type may occupy a percentage of the volume of the auxiliary heat storage chamber lower than that one indicated above, however not less than 50% (minimum percentage of refractory material of a grainy or sandy or dusty type useful to ensure a satisfactory thermal efficiency).
  • the grainy or sandy or dusty refractory material includes natural sand (found in nature without environmental damage), not subjected to any industrial processing.
  • the aforesaid natural sand is any of the types of sand chosen by the group consisting of quartz sand, sand loaded with metallic material powder, partly metallic material powder (such as aluminum oxide, also known as alumina), clay, ceramic fiber and their combinations.
  • the natural sand with which, in the invention, the auxiliary heat storage chamber 6 is filled is preferably taken from the river bed and has a high density (or a very fine grain, having a relative density value including, for example, in the range 0.5 ⁇ 5 g/cm 3 and a maximum size, for example, in the range 0.1 ⁇ 5 mm, as it is better from a thermal yielding point of view).
  • the heat accumulation heating apparatus 1 of the invention includes a conveying and heat-exchange circuit, indicated overall with 7, operatively connected to the combustion chamber 4 and communicating with the external environment, interposed between the combustion chamber 4 and the auxiliary storage chamber 6 with which it presents at least a boundary portion of the perimetric wall in common and suitable to receive the fumes F (indicated schematically, by the directional arrows W, in figures 3 and 4 ), resulting from or produced by the combustion of the solid fuel material P caused by the possible activation of an ignition resistance of the burner member 5 when affected by combustion air, to convey the fumes F themselves into the external environment.
  • the conveying and heat-exchange circuit 7 is defined inside the outer casing 2 and presents a tortuous, diffused or distributed development, depending on the constructive choices.
  • the conveying and heat-exchange circuit 7 comprises a plurality of tubular elements 8 parallel each other, facing the auxiliary storage chamber 6 and communicating superiorly with the combustion chamber 4 and inferiorly with the external environment through a through opening, not illustrated for the sake of exposure brevity, made in the outer casing 2, in particular in its rear wall 2b.
  • tubular elements 8 of the conveying and heat-exchange circuit 7, better visible in the details of figures 8 and 9 do not communicate with each other by means of curved fittings to them monolithic, as it is the case in a typical coil installed in the accumulation heating apparatuses of the known art, but are simultaneously travelled by the fumes F coming from the combustion chamber 4.
  • the conveying and heat-exchange circuit could include smooth walls defined directly in the auxiliary storage chamber, so that the combustion fumes directly affect the grainy or sandy or dusty refractory material contained thereto.
  • the solid fuel material heating apparatus 1 of the invention also includes suction means, as a whole numbered with 9, contained in a lower part 2c of the outer casing 2, to which they are firmly coupled, and communicating with the inner volume 10 of the outer casing 2 to introduce into the latter air at room temperature coming from the external environment and to convey to the external environment by convection, through one or more through outlet vents, not illustrated for the sake of simplicity exhibition in the attached figures, made in a front wall 2a of the outer casing 2, heated air, having a temperature higher than the room temperature.
  • suction means as a whole numbered with 9, contained in a lower part 2c of the outer casing 2, to which they are firmly coupled, and communicating with the inner volume 10 of the outer casing 2 to introduce into the latter air at room temperature coming from the external environment and to convey to the external environment by convection, through one or more through outlet vents, not illustrated for the sake of simplicity exhibition in the attached figures, made in a front wall 2a of the outer casing 2, heated air, having a temperature higher than the
  • the suction means 9 include any of the devices chosen from the group consisting of centrifugal fans (favourably), tangential fans and the like.
  • the heating apparatus 1 of the heat accumulation type of the current invention also includes expulsion means, overall marked with 11, contained in a lower part 2c of the outer casing 2 which they are firmly coupled to and communicating with the conveying and heat-exchange circuit 7, in relation to which they're functionally arranged downstream, as seen in figures 1 and 3 .
  • the expulsion means 11 suck combustion air into the combustion chamber 4 useful to initialize the combustion of the solid fuel material P, and push (recalling it) towards the external environment, through the aforesaid through opening made in a rear wall 2b of the outer casing 2, the fumes F produced by the combustion of the solid fuel material P by the burner member 5 in the combustion chamber 4.
  • the ejection means 11 include a centrifugal fan 12 of the type in itself known in the industry for this type of equipment.
  • the suction means 9 and ejection means 11 are arranged substantially symmetrically with respect to the vertical linear axis Y defined by the outer casing 2.
  • FIGS 1-7 also highlight some of the other important components (although not directly related to the technical concept claimed by this invention and not fundamental for the resolution of the technical problems listed above) of the heating equipment 1 storage and solid fuel of the invention, traditionally also provided for by the equivalent heating equipment of the known art, such as:
  • solid fuel material or solid biomass such as pellets, wood, coal and/or wooded material apparatus (or even storage stove), used for heating heat generation of the invention, achieves the purposes and reaches the advantages yet mentioned.
  • the solid fuel material apparatus, of the thermal accumulation type, for heat generation of the present invention presents a construction concept simpler than the heating apparatuses of the prior art comparable to it, with the consequence, on one hand, of achieving a reduction in production costs and, on the other hand, of increasing the competitiveness of sales prices to the public, the other factors involved in the calculation of the cost of the finished product such as, for example, the cost of raw materials and the cost of labour being equal.
  • the (at least one) auxiliary heat storage chamber can be only partly filled with grainy or sandy or dusty refractory material and can be only partly in thermal contact with the combustion chamber.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Solid-Fuel Combustion (AREA)
EP20217952.9A 2020-01-16 2020-12-31 Festbrennstoffmaterialvorrichtung zur wärmeerzeugung Pending EP3851745A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202000000685 2020-01-16

Publications (1)

Publication Number Publication Date
EP3851745A1 true EP3851745A1 (de) 2021-07-21

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EP20217952.9A Pending EP3851745A1 (de) 2020-01-16 2020-12-31 Festbrennstoffmaterialvorrichtung zur wärmeerzeugung

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH180618A (de) * 1935-04-17 1935-11-15 Koenig Hermann Heizofen für Holzfeuerung.
DE848241C (de) * 1948-10-02 1952-09-01 Carl Kluth Wandung fuer Heiz- oder Kochvorrichtungen aller Art
US4270512A (en) * 1978-03-06 1981-06-02 Maas Robert E V D Heat storing fireplace
DE3710014A1 (de) 1987-03-26 1988-10-13 Heybey Hans Gerhard Waermespeicherndes element
AT389383B (de) * 1986-01-30 1989-11-27 Pedit Ges M B H Ofen
DE19806257A1 (de) * 1997-02-18 1998-08-20 Karl Stefan Riener Ofen für die Verbrennung von Pellets
DE19859353A1 (de) * 1998-12-22 2003-08-21 Robert Wimmer Speicherofen
WO2015121848A1 (en) 2014-02-17 2015-08-20 Gruppo Piazzetta S.P.A. Storage heating or slow heat release stove
WO2015151848A1 (ja) 2014-04-01 2015-10-08 古河電気工業株式会社 二次電池状態検出装置および二次電池状態検出方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH180618A (de) * 1935-04-17 1935-11-15 Koenig Hermann Heizofen für Holzfeuerung.
DE848241C (de) * 1948-10-02 1952-09-01 Carl Kluth Wandung fuer Heiz- oder Kochvorrichtungen aller Art
US4270512A (en) * 1978-03-06 1981-06-02 Maas Robert E V D Heat storing fireplace
AT389383B (de) * 1986-01-30 1989-11-27 Pedit Ges M B H Ofen
DE3710014A1 (de) 1987-03-26 1988-10-13 Heybey Hans Gerhard Waermespeicherndes element
DE19806257A1 (de) * 1997-02-18 1998-08-20 Karl Stefan Riener Ofen für die Verbrennung von Pellets
DE19859353A1 (de) * 1998-12-22 2003-08-21 Robert Wimmer Speicherofen
WO2015121848A1 (en) 2014-02-17 2015-08-20 Gruppo Piazzetta S.P.A. Storage heating or slow heat release stove
WO2015151848A1 (ja) 2014-04-01 2015-10-08 古河電気工業株式会社 二次電池状態検出装置および二次電池状態検出方法

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