CN113347748B - Rectangular carbon-based electrothermal film with high power density and preparation method thereof - Google Patents
Rectangular carbon-based electrothermal film with high power density and preparation method thereof Download PDFInfo
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- CN113347748B CN113347748B CN202110592579.5A CN202110592579A CN113347748B CN 113347748 B CN113347748 B CN 113347748B CN 202110592579 A CN202110592579 A CN 202110592579A CN 113347748 B CN113347748 B CN 113347748B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
Abstract
The application relates to the technical field of electric heating, in particular to a rectangular carbon-based electric heating film with high power density and a preparation method thereof. The preparation method of the rectangular carbon-based electrothermal film comprises the following steps: sequentially arranging a plurality of positive single electrodes and a plurality of negative single electrodes on the front surface of the electrothermal film at equal intervals in parallel along the length direction of the electrothermal film, and then respectively pressing the positive single electrodes and the negative single electrodes on the electrothermal film; masking the positive single electrode and the negative single electrode which are positioned on the front side of the electrothermal film, then spraying carbon-based slurry, and drying; and arranging a first current collector electrode and a second current collector electrode on the back of the electric heating film respectively, riveting one end of the first current collector electrode with the positive single electrode, and riveting one end of the second current collector electrode with the negative single electrode. The preparation method provided by the application is simple to operate, and the power density of the electrothermal film is greatly improved.
Description
Technical Field
The application relates to the technical field of electric heating, in particular to a rectangular carbon-based electric heating film with high power density and a preparation method thereof.
Background
At present, common heating modes comprise resistance wire heating, electromagnetic radiation heating and electrothermal film heating, the resistance wire heating is to electrically heat an object by utilizing heat energy generated by Joule effect of current flowing through a conductor, and the defects of low heat efficiency, low safety coefficient, short service life and the like exist; the electromagnetic radiation heating utilizes radiation energy for heating, so that the problem of high cost exists; the electrothermal film heating is to heat an object by converting electric energy into heat energy after being electrified, and has remarkable energy-saving effect, so that the electrothermal film heating technology is more and more concerned by people.
According to the type of materials, the electrothermal film can be divided into a metal-based resistive film, a carbon-based electrothermal film and a PTC (Positive Temperature Coefficient) conductive polymer film, the power controllability of the metal-based resistive film is high, the heating power can be adjusted by adjusting the total length/width of a metal strip, and the problems of poor flexibility, large weight and uneven heating exist although the use reliability is high; the carbon-based electrothermal film has the advantages of light weight, high thermal efficiency and uniform heating, but the power density is lower; the PTC conductive polymer film is made of a PTC resistor, and has a characteristic that the resistivity increases with an increase in temperature, but has a problem of high cost.
The power density of carbon back electric heat membrane is by membrane power and membrane area of generating heat decision, to the problem that the power density of carbon back electric heat membrane is low, adopts following mode to improve power density in the current design: 1. changing the carbon content ratio in the slurry; 2. changing the thickness and density of the slurry coating layer; 3. changing the length-width ratio of the electrothermal film; although the mode can improve the power density of the carbon-based electrothermal film, the change of the raw material formula, the molding process and the product appearance is limited by objective conditions.
Therefore, there is a need for a method for preparing a rectangular carbon-based electrothermal film with high power density without being limited by objective conditions.
Disclosure of Invention
The embodiment of the application provides a rectangular carbon-based electrothermal film with high power density and a preparation method thereof, and the preparation method provided by the application can be used for preparing the carbon-based electrothermal film with high power density under the condition of not changing the area and the length-width ratio of the electrothermal film.
In a first aspect, the application provides a preparation method of a rectangular carbon-based electrothermal film with high power density, which comprises the following steps:
step S101, arranging a plurality of positive single electrodes and a plurality of negative single electrodes on the front surface of an electrothermal film in parallel at equal intervals in sequence along the length direction of the electrothermal film, and then respectively pressing the positive single electrodes and the negative single electrodes on the electrothermal film;
step S102, masking the positive single electrode and the negative single electrode which are positioned on the front surface of the electrothermal film, spraying carbon-based slurry, and drying;
and S103, respectively arranging a first current collector electrode and a second current collector electrode on the back of the electric heating film, riveting one end of the first current collector electrode with the positive single electrode, and riveting one end of the second current collector electrode with the negative single electrode.
In some embodiments, the length of the positive single electrode and the length of the negative single electrode are both greater than the width of the electrothermal film.
In some embodiments, the electrothermal film comprises an electrothermal film left end and an electrothermal film right end, the positive single electrode comprises a positive single electrode left end and a positive single electrode right end, the positive single electrode left end is flush with the front face of the electrothermal film left end, and the positive single electrode right end is folded and pressed on the back face of the electrothermal film right end.
In some embodiments, the length of the positive single electrode on the back surface of the right end of the electric heating film is about 20 mm.
In some embodiments, the negative single electrode comprises a negative single electrode left end and a negative single electrode right end, the negative single electrode right end is flush with the front surface of the electrothermal film right end, and the negative single electrode left end is folded and pressed on the back surface of the electrothermal film left end.
In some embodiments, the length of the negative single electrode on the back surface of the left end of the electric heating film is about 20 mm.
In some embodiments, the positive single electrode is a rectangular copper strip with a width of 2-4 mm.
In some embodiments, the negative single electrode is a rectangular copper strip with a width of 2-4 mm.
In some embodiments, the width of the mask plate used in the mask process is 1-2 mm smaller than that of the positive electrode single electrode.
In some embodiments, the width of the mask plate used in the masking process is 1-2 mm smaller than that of the negative single electrode.
In some embodiments, the carbon-based slurry is prepared by: adding the carbon nano tube powder into N-methyl pyrrolidone, and ultrasonically stirring to obtain the carbon-based slurry. In some preferred embodiments, the carbon-based slurry is prepared by the following steps: weighing 1.1 kg-1.2 kg of carbon nano tube powder, adding the carbon nano tube powder into 20L N-methyl pyrrolidone, and carrying out ultrasonic stirring to fully mix for 10 hours to obtain carbon-based slurry.
In some embodiments, the first current collector electrode is a rectangular copper strip 6-8 mm wide.
In some embodiments, the second current collector electrode is a rectangular copper strip 6-8 mm wide.
In some embodiments, one end of the first current collector electrode is riveted with the right end of the positive single electrode, one end of the second current collector electrode is riveted with the left end of the negative single electrode, and the other end of the first current collector electrode and the other end of the second current collector electrode are respectively connected with a power supply.
In some embodiments, the number of the positive single electrodes is at least two. In some preferred embodiments, the number of the positive single electrodes is five.
In some embodiments, the number of the negative single electrodes is at least one. In some preferred embodiments, the number of the negative single electrodes is four.
In a second aspect, the application provides a rectangle carbon base electric heat membrane, the electric heat membrane utilizes above-mentioned preparation method to make, the front of electric heat membrane is along its length direction equidistant parallel arrangement a plurality of positive pole single electrodes and a plurality of negative pole single electrodes in proper order, positive pole single electrode and negative pole single electrode pressfitting respectively are on the electric heat membrane, first mass flow body electrode and second mass flow body electrode are arranged respectively to the back of electric heat membrane, first mass flow body electrode and positive pole single electrode riveting, second mass flow body electrode and negative pole single electrode riveting.
In some embodiments, the electrothermal film comprises an electrothermal film left end and an electrothermal film right end, the positive single electrode comprises a positive single electrode left end and a positive single electrode right end, the positive single electrode left end is flush with the front face of the electrothermal film left end, and the positive single electrode right end is folded and pressed on the back face of the electrothermal film right end.
In some embodiments, the length of the positive electrode on the back side of the right end of the electric heating film is about 20 mm.
In some embodiments, the negative single electrode comprises a negative single electrode left end and a negative single electrode right end, the negative single electrode right end is flush with the front surface of the electrothermal film right end, and the negative single electrode left end is folded and pressed on the back surface of the electrothermal film left end.
In some embodiments, the length of the negative single electrode on the back surface of the left end of the electric heating film is about 20 mm.
In some embodiments, the positive single electrode is a rectangular copper strip with a width of 2-4 mm.
In some embodiments, the negative single electrode is a rectangular copper strip with a width of 2-4 mm.
In some embodiments, the width of the mask plate used in the mask process is 1-2 mm smaller than that of the positive electrode single electrode.
In some embodiments, the width of the mask plate used in the masking process is 1-2 mm smaller than that of the negative single electrode.
In some embodiments, the carbon-based slurry is prepared by: adding the carbon nano tube powder into N-methyl pyrrolidone, and ultrasonically stirring to obtain the carbon-based slurry. In some preferred embodiments, the carbon-based slurry is prepared by: weighing 1.1 kg-1.2 kg of carbon nano tube powder, adding the carbon nano tube powder into 20L N-methyl pyrrolidone, and carrying out ultrasonic stirring to fully mix for 10 hours to obtain carbon-based slurry.
In some embodiments, the first current collector electrode is a rectangular copper strip 6-8 mm wide.
In some embodiments, the second current collector electrode is a rectangular copper strip 6-8 mm wide.
In some embodiments, one end of the first current collector electrode is riveted with the right end of the positive single electrode, one end of the second current collector electrode is riveted with the left end of the negative single electrode, and the other end of the first current collector electrode and the other end of the second current collector electrode are respectively connected with a power supply.
In some embodiments, the number of the positive single electrodes is at least two. In some preferred embodiments, the number of the positive electrode single electrodes is five.
In some embodiments, the number of the negative single electrodes is at least one. In some preferred embodiments, the number of the negative single electrodes is four.
In some embodiments, the length of the positive single electrode and the length of the negative single electrode are both greater than the width of the electrothermal film.
The third aspect, the application provides the application of above-mentioned rectangle carbon base electric heat membrane, the electric heat membrane is applied to the heating of battery package.
The beneficial effect that technical scheme that this application provided brought includes:
1. the preparation method provided by the application is simple to operate, and on the premise of not changing the area and the length-width ratio of the electric heating film, the rectangular heating surface of the electric heating film is divided by using the multiple pairs of electrodes, so that the divided rectangular heating surface obtains a very high length-width ratio, the surface resistance of the heating surface is obviously reduced, and the power density of the electric heating film is greatly improved;
2. according to the preparation method provided by the application, the first current collector electrode and the second current collector electrode are folded to the back of the electric heating film, so that the front effective heating area of the electric heating film is not occupied;
3. the electrothermal film prepared by the preparation method provided by the application is suitable for application scenes with large vehicle-mounted heating power density, such as: nozzle heating, glass ice melting and battery pack heating.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic front view of an electrothermal film prepared by the preparation method provided by the present application;
FIG. 2 is a schematic view of the back side of an electrothermal film prepared by the preparation method provided by the present application;
fig. 3 is a schematic flow chart of a method for manufacturing a high-power-density rectangular carbon-based electrothermal film according to an embodiment of the present disclosure;
fig. 4 is a schematic front view of a rectangular carbon-based electrothermal film provided in embodiment 2 of the present application;
fig. 5 is a schematic back view of a rectangular carbon-based electrothermal film provided in embodiment 2 of the present application;
fig. 6 is a schematic front view of a rectangular carbon-based electrothermal film provided in embodiment 3 of the present application;
fig. 7 is a schematic back view of a rectangular carbon-based electrothermal film provided in embodiment 3 of the present application;
fig. 8 is a schematic front view of a rectangular carbon-based electrothermal film provided in embodiment 4 of the present application;
fig. 9 is a schematic back view of a rectangular carbon-based electrothermal film provided in embodiment 4 of the present application.
In the figure: the device comprises a positive electrode single electrode-1, a positive electrode single electrode left end-11, a positive electrode single electrode right end-12, a negative electrode single electrode-2, a negative electrode single electrode left end-21, a negative electrode single electrode right end-22, an electric heating film-3, an electric heating film left end-31, an electric heating film right end-32, a first current collector electrode-4 and a second current collector electrode-5.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a high-power-density rectangular carbon-based electrothermal film, fig. 1 is a front schematic view of an electrothermal film 3 of an embodiment of the application, fig. 2 is a back schematic view of the electrothermal film 3 of an embodiment of the application, refer to fig. 1 and fig. 2, a plurality of positive single electrodes 1 and a plurality of negative single electrodes 2 are arranged in parallel at equal intervals along the length direction of the front side of the electrothermal film 3 in sequence, the positive single electrodes 1 and the negative single electrodes 2 are respectively pressed on the electrothermal film 3, and the electrothermal film 3 is divided into a plurality of heating areas by the positive single electrodes 1 and the negative single electrodes 2.
The electrothermal film 3 comprises an electrothermal film left end 31 and an electrothermal film right end 32, the positive single electrode 1 comprises a positive single electrode left end 11 and a positive single electrode right end 12, the positive single electrode left end 11 is flush with the front surface of the electrothermal film left end 31, and the positive single electrode right end 12 is folded and pressed on the back surface of the electrothermal film right end 32; the negative single electrode 2 comprises a negative single electrode left end 21 and a negative single electrode right end 22, the negative single electrode right end 22 is flush with the front surface of the electrothermal film right end 32, and the negative single electrode left end 21 is folded and pressed on the back surface of the electrothermal film left end 31.
First mass flow body electrode 4 and second mass flow body electrode 5 are arranged respectively to the back of electric heat membrane 3, and the one end and the single positive electrode right-hand member 12 riveting of first mass flow body electrode 4, and the one end and the single negative electrode left end 21 riveting of second mass flow body electrode 5, the other end of first mass flow body electrode 4 and the other end of second mass flow body electrode 5 are connected with the power respectively.
The embodiment of the application also provides a preparation method of the rectangular carbon-based electrothermal film with high power density, and the preparation method provided by the application can be used for preparing the carbon-based electrothermal film with high power density under the condition of not changing the area and the length-width ratio of the electrothermal film.
Fig. 3 is a schematic flow chart of a method for manufacturing a rectangular carbon-based electrothermal film with high power density, according to an embodiment of the present disclosure, with reference to fig. 3, the method includes the following steps:
step S101, arranging a plurality of positive single electrodes 1 and a plurality of negative single electrodes 2 on the front surface of an electrothermal film 3 in parallel at equal intervals in sequence along the length direction of the electrothermal film 3, and then respectively pressing the positive single electrodes 1 and the negative single electrodes 2 on the electrothermal film 3; wherein the positive single electrode 1 is a rectangular copper strip with the width of 2-4 mm, and the negative single electrode 2 is a rectangular copper strip with the width of 2-4 mm;
step S102, masking the positive single electrode 1 and the negative single electrode 2 which are positioned on the front surface of the electrothermal film 3, then spraying carbon-based slurry, and drying; the width of the mask plate used in the masking process is 1-2 mm smaller than the width of the positive single electrode 1 and the negative single electrode 2, and the preparation process of the carbon-based slurry is as follows: adding carbon nano tube powder into N-methyl pyrrolidone, and ultrasonically stirring to obtain carbon-based slurry;
step S103, arranging a first current collector electrode 4 and a second current collector electrode 5 on the back of the electric heating film 3 respectively, riveting one end of the first current collector electrode 4 with the right end 12 of the single anode electrode, and riveting one end of the second current collector electrode 5 with the left end 21 of the single cathode electrode; the first current collector electrode 4 is a rectangular copper strip 6-8 mm wide, and the second current collector electrode 5 is a rectangular copper strip 6-8 mm wide.
The following describes in detail the rectangular carbon-based electrothermal film with high power density and the preparation method thereof, which are provided by the present application, with reference to the following embodiments.
Example 1:
The electrothermal film 3 comprises an electrothermal film left end 31 and an electrothermal film right end 32, the positive single electrode 1 comprises a positive single electrode left end 11 and a positive single electrode right end 12, the positive single electrode left end 11 is flush with the front surface of the electrothermal film left end 31, and the positive single electrode right end 12 is folded and pressed on the back surface of the electrothermal film right end 32; the negative single electrode 2 comprises a negative single electrode left end 21 and a negative single electrode right end 22, the negative single electrode right end 22 is flush with the front surface of the electrothermal film right end 32, and the negative single electrode left end 21 is folded and pressed on the back surface of the electrothermal film left end 31.
First mass flow body electrode 4 and second mass flow body electrode 5 are arranged respectively to the back of electric heat membrane 3, and the one end and the single positive electrode right-hand member 12 riveting of first mass flow body electrode 4, and the one end and the single negative electrode left end 21 riveting of second mass flow body electrode 5, the other end of first mass flow body electrode 4 and the other end of second mass flow body electrode 5 are connected with the power respectively.
The preparation method of the electrothermal film 3 comprises the following steps:
(1) five rectangular copper strips A1 with the width of 2mm and four rectangular copper strips B1 with the width of 2mm are arranged on the front surface of the electrothermal film 3 in parallel at equal intervals along the length direction of the electrothermal film 3, so that the left end of the rectangular copper strips A1 is flush with the front surface of the left end 31 of the electrothermal film, the right end of the rectangular copper strips A1 is folded on the back surface of the right end 32 of the electrothermal film, the right end of the rectangular copper strips B1 is flush with the front surface of the right end 32 of the electrothermal film, the left end of the rectangular copper strips B1 is folded on the back surface of the left end 31 of the electrothermal film, and then the rectangular copper strips A1 and the rectangular copper strips B1 are respectively pressed on the electrothermal film 3 by a hot pressing method; the lengths of the rectangular copper strip A1 and the rectangular copper strip B1 which are pressed on the back of the electrothermal film 3 are both 20 mm;
(2) masking the rectangular copper strip A1 and the rectangular copper strip B1 which are positioned on the front side of the electrothermal film 3, spraying carbon-based slurry, and drying; wherein, the preparation process of the carbon-based slurry comprises the following steps: adding 1.1kg of carbon nano tube powder into 20L N-methyl pyrrolidone, and carrying out ultrasonic stirring to fully mix for 10h to obtain carbon-based slurry;
(3) the back of the electrothermal film 3 is respectively provided with a rectangular copper strip C1 with the width of 6mm and a rectangular copper strip D1 with the width of 6mm, then one end of the rectangular copper strip C1 is riveted with the right end of the rectangular copper strip A1, one end of the rectangular copper strip D1 is riveted with the left end of the rectangular copper strip B1, and the other end of the rectangular copper strip C1 and the other end of the rectangular copper strip D1 are respectively connected with a power supply.
Compared with a rectangular carbon-based electrothermal film with the same shape and area and one positive electrode and one negative electrode, the rectangular carbon-based electrothermal film divided by five positive electrode single electrodes 1 and four negative electrode single electrodes 2 provided by the embodiment 1 has the advantage that the heating power density can be improved by 7-8 times under a 24V voltage-stabilized power supply.
The calculation process of the heating power density of the electric heating film before and after the division is as follows:
setting the area of the electric heating film before division as S, the resistance as R, the length as L (parallel to the current direction), the width as W (vertical to the current direction), and the heating power as P; the formula for the resistance R is: r is rho L/WtshWhere R is equal to RshL/W，RshThe square resistance is represented, t represents the thickness of the carbon-based material used for preparing the electrothermal film, and rho represents the resistivity of the carbon-based material used for preparing the electrothermal film;
the length of the heating area of the single electric heating film after being divided is L1，L1L/8, the width of the heating area of the single electric heating film is W1，W1W, resistance R1Heating power is P1；
When the electric heating film works, the voltage between the first current collector electrode 4 and the second current collector electrode 5 is U, and the single rectangular copperThe voltage between the strip A1 and the single rectangular copper strip B1 is U1，U1＝U；
The calculation formula of the heating power is as follows:
P＝U2/R，P1＝U1 2/R1；
front and back, square resistor R of electric heating filmshNot change, then R1＝Rsh*L1/W1＝Rsh*L/8W＝R/8
P1＝U1 2/R1＝8U2/R＝8P
According to the calculation, the heating power of the split electric heating film is 8 times of that of the electric heating film before splitting, and if the film heating area loss caused by the area of the electrode is considered, the heating power of the split electric heating film is 7-8 times of that of the electric heating film before splitting.
Example 2:
The electrothermal film 3 comprises an electrothermal film left end 31 and an electrothermal film right end 32, the positive single electrode 1 comprises a positive single electrode left end 11 and a positive single electrode right end 12, the positive single electrode left end 11 is flush with the front surface of the electrothermal film left end 31, and the positive single electrode right end 12 is folded and pressed on the back surface of the electrothermal film right end 32; the negative single electrode 2 comprises a negative single electrode left end 21 and a negative single electrode right end 22, the negative single electrode right end 22 is flush with the front surface of the electrothermal film right end 32, and the negative single electrode left end 21 is folded and pressed on the back surface of the electrothermal film left end 31.
First mass flow body electrode 4 and second mass flow body electrode 5 are arranged respectively to the back of electric heat membrane 3, and the one end and the single positive electrode right-hand member 12 riveting of first mass flow body electrode 4, and the one end and the single negative electrode left end 21 riveting of second mass flow body electrode 5, the other end of first mass flow body electrode 4 and the other end of second mass flow body electrode 5 are connected with the power respectively.
The preparation method of the electrothermal film 3 comprises the following steps:
(1) three rectangular copper strips A1 with the width of 2mm and two rectangular copper strips B1 with the width of 2mm are arranged on the front surface of the electrothermal film 3 in parallel at equal intervals along the length direction of the electrothermal film 3, so that the left end of the rectangular copper strips A1 is flush with the front surface of the left end 31 of the electrothermal film, the right end of the rectangular copper strips A1 is folded on the back surface of the right end 32 of the electrothermal film, the right end of the rectangular copper strips B1 is flush with the front surface of the right end 32 of the electrothermal film, the left end of the rectangular copper strips B1 is folded on the back surface of the left end 31 of the electrothermal film, and then the rectangular copper strips A1 and the rectangular copper strips B1 are respectively pressed on the electrothermal film 3 by a hot pressing method; the lengths of the rectangular copper strip A1 and the rectangular copper strip B1 which are pressed on the back of the electrothermal film 3 are both 20 mm;
(2) masking the rectangular copper strip A1 and the rectangular copper strip B1 which are positioned on the front side of the electrothermal film 3, spraying carbon-based slurry, and drying; wherein, the preparation process of the carbon-based slurry comprises the following steps: adding 1.1kg of carbon nano tube powder into 20L N-methyl pyrrolidone, and carrying out ultrasonic stirring to fully mix for 10h to obtain carbon-based slurry;
(3) the back of the electrothermal film 3 is respectively provided with a rectangular copper strip C1 with the width of 6mm and a rectangular copper strip D1 with the width of 6mm, then one end of the rectangular copper strip C1 is riveted with the right end of the rectangular copper strip A1, one end of the rectangular copper strip D1 is riveted with the left end of the rectangular copper strip B1, and the other end of the rectangular copper strip C1 and the other end of the rectangular copper strip D1 are respectively connected with a power supply.
Following the calculation procedure for the heating power density provided in example 1:
the length of the heating area of the single electric heating film after being divided is L2，L2L/4, the width of the heating area of the single electric heating film is W2，W1W, resistance R2Heating power is P2；R2＝Rsh*L2/W2＝Rsh*L/4W＝R/4；
When the electrothermal film works, the voltage between the first current collector electrode 4 and the second current collector electrode 5 is U, and the voltage between the single rectangular copper strip A1 and the single rectangular copper strip B1Is U2，U2＝U；
Heating power P2The calculation formula of (2) is as follows:
P2＝U2 2/R2；
front and back, square resistor R of electric heating filmshWithout change, then
P2＝U2 2/R2＝4U2/R＝4P
It can be known from the above calculation that, compared with the rectangular carbon-based electrothermal film with one positive electrode single electrode and one negative electrode single electrode having the same shape and area, the rectangular carbon-based electrothermal film divided by four positive electrode single electrodes 1 and three negative electrode single electrodes 2 provided in embodiment 2 has a heating power density that can be increased by 3-4 times under a 24V regulated power supply.
Example 3:
The electrothermal film 3 comprises an electrothermal film left end 31 and an electrothermal film right end 32, the positive single electrode 1 comprises a positive single electrode left end 11 and a positive single electrode right end 12, the positive single electrode left end 11 is flush with the front surface of the electrothermal film left end 31, and the positive single electrode right end 12 is folded and pressed on the back surface of the electrothermal film right end 32; the negative single electrode 2 comprises a negative single electrode left end 21 and a negative single electrode right end 22, the negative single electrode right end 22 is flush with the front surface of the electrothermal film right end 32, and the negative single electrode left end 21 is folded and pressed on the back surface of the electrothermal film left end 31.
First mass flow body electrode 4 and second mass flow body electrode 5 are arranged respectively to the back of electric heat membrane 3, and the one end and the single positive electrode right-hand member 12 riveting of first mass flow body electrode 4, and the one end and the single negative electrode left end 21 riveting of second mass flow body electrode 5, the other end of first mass flow body electrode 4 and the other end of second mass flow body electrode 5 are connected with the power respectively.
The preparation method of the electrothermal film 3 comprises the following steps:
(1) four rectangular copper strips A2 with the width of 3mm and three rectangular copper strips B2 with the width of 3mm are arranged on the front surface of the electrothermal film 3 in parallel at equal intervals along the length direction of the electrothermal film 3, so that the left end of the rectangular copper strips A2 is flush with the front surface of the left end 31 of the electrothermal film, the right end of the rectangular copper strips A2 is folded on the back surface of the right end 32 of the electrothermal film, the right end of the rectangular copper strips B2 is flush with the front surface of the right end 32 of the electrothermal film, the left end of the rectangular copper strips B2 is folded on the back surface of the left end 31 of the electrothermal film, and then the rectangular copper strips A2 and the rectangular copper strips B2 are respectively pressed on the electrothermal film 3 by a hot pressing method; the lengths of the rectangular copper strip A2 and the rectangular copper strip B2 which are pressed on the back of the electrothermal film 3 are both 20 mm;
(2) masking the rectangular copper strip A2 and the rectangular copper strip B2 which are positioned on the front side of the electrothermal film 3, spraying carbon-based slurry, and drying; wherein, the preparation process of the carbon-based slurry comprises the following steps: adding 1.2kg of carbon nano tube powder into 20L N-methyl pyrrolidone, and carrying out ultrasonic stirring to fully mix for 10h to obtain carbon-based slurry;
(3) the back of the electrothermal film 3 is respectively provided with a rectangular copper strip C2 with the width of 7mm and a rectangular copper strip D2 with the width of 7mm, then one end of the rectangular copper strip C2 is riveted with the right end of the rectangular copper strip A2, one end of the rectangular copper strip D2 is riveted with the left end of the rectangular copper strip B2, and the other end of the rectangular copper strip C2 and the other end of the rectangular copper strip D2 are respectively connected with a power supply.
Following the calculation procedure for the heating power density provided in example 1:
the length of the heating area of the single electric heating film after being divided is L3，L3L/6, the width of the heating area of the single electric heating film is W3，W3W, resistance R3Heating power is P3；R3＝Rsh*L3/W3＝Rsh*L/6W＝R/6；
When the electrothermal film works, the voltage between the first current collector electrode 4 and the second current collector electrode 5 is U, and the voltage between the single rectangular copper strip A2 and the single rectangular copper strip B2 is U3，U3＝U；
Heating functionRate P3The calculation formula of (2) is as follows:
P3＝U3 2/R3；
front and back, square resistor R of electric heating filmshWithout change, then
P3＝U3 2/R3＝6U2/R＝6P
As can be seen from the above calculation, the rectangular carbon-based electrothermal film obtained by dividing the four positive electrode single electrodes 1 and the three negative electrode single electrodes 2 according to embodiment 3 can increase the heating power density by 5 to 6 times under a 24V regulated power supply, compared with a rectangular carbon-based electrothermal film having one positive electrode single electrode and one negative electrode single electrode with the same shape and area.
Example 4:
The electrothermal film 3 comprises an electrothermal film left end 31 and an electrothermal film right end 32, the positive single electrode 1 comprises a positive single electrode left end 11 and a positive single electrode right end 12, the positive single electrode left end 11 is flush with the front surface of the electrothermal film left end 31, and the positive single electrode right end 12 is folded and pressed on the back surface of the electrothermal film right end 32; the negative single electrode 2 comprises a negative single electrode left end 21 and a negative single electrode right end 22, the negative single electrode right end 22 is flush with the front surface of the electrothermal film right end 32, and the negative single electrode left end 21 is folded and pressed on the back surface of the electrothermal film left end 31.
First mass flow body electrode 4 and second mass flow body electrode 5 are arranged respectively to the back of electric heat membrane 3, and the one end and the single positive electrode right-hand member 12 riveting of first mass flow body electrode 4, and the one end and the single negative electrode left end 21 riveting of second mass flow body electrode 5, the other end of first mass flow body electrode 4 and the other end of second mass flow body electrode 5 are connected with the power respectively.
The preparation method of the electrothermal film 3 comprises the following steps:
(1) six rectangular copper strips A3 with the width of 4mm and five rectangular copper strips B3 with the width of 4mm are arranged on the front surface of the electrothermal film 3 in parallel at equal intervals along the length direction of the electrothermal film 3, so that the left end of the rectangular copper strips A3 is flush with the front surface of the left end 31 of the electrothermal film, the right end of the rectangular copper strips A3 is folded on the back surface of the right end 32 of the electrothermal film, the right end of the rectangular copper strips B3 is flush with the front surface of the right end 32 of the electrothermal film, the left end of the rectangular copper strips B3 is folded on the back surface of the left end 31 of the electrothermal film, and then the rectangular copper strips A3 and the rectangular copper strips B3 are respectively pressed on the electrothermal film 3 by a hot pressing method; the lengths of the rectangular copper strip A3 and the rectangular copper strip B3 which are pressed on the back of the electrothermal film 3 are both 20 mm;
(2) masking the rectangular copper strip A3 and the rectangular copper strip B3 which are positioned on the front side of the electrothermal film 3, spraying carbon-based slurry, and drying; wherein, the preparation process of the carbon-based slurry comprises the following steps: adding 1.1kg of carbon nano tube powder into 20L N-methyl pyrrolidone, and carrying out ultrasonic stirring to fully mix for 10h to obtain carbon-based slurry;
(3) the back of the electrothermal film 3 is respectively provided with a rectangular copper strip C3 with the width of 8mm and a rectangular copper strip D3 with the width of 8mm, then one end of the rectangular copper strip C3 is riveted with the right end of the rectangular copper strip A3, one end of the rectangular copper strip D3 is riveted with the left end of the rectangular copper strip B3, and the other end of the rectangular copper strip C3 and the other end of the rectangular copper strip D3 are respectively connected with a power supply.
Following the calculation procedure for the heating power density provided in example 1:
the length of the heating area of the single electric heating film after being divided is L4，L4L/10, the width of the heating area of the single electric heating film is W4，W4W, resistance R4Heating power is P4；R4＝Rsh*L4/W4＝Rsh*L/10W＝R/10；
When the electrothermal film works, the voltage between the first current collector electrode 4 and the second current collector electrode 5 is U, and the voltage between the single rectangular copper strip A3 and the single rectangular copper strip B3 is U4，U4＝U；
Heating power P4The calculation formula of (c) is:
P4＝U4 2/R4；
front and back, square resistor R of electric heating filmshWithout change, then
P4＝U4 2/R4＝10U2/R＝10P
As can be seen from the above calculation, the rectangular carbon-based electrothermal film obtained by dividing the six positive electrode single electrodes 1 and the five negative electrode single electrodes 2 according to embodiment 4 has a heating power density that is 9 to 10 times higher than that of a rectangular carbon-based electrothermal film having one positive electrode single electrode and one negative electrode single electrode with the same shape and area under a 24V regulated power supply.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of a rectangular carbon-based electrothermal film with high power density is characterized by comprising the following steps:
s101, arranging a plurality of positive single electrodes (1) and a plurality of negative single electrodes (2) on the front surface of an electrothermal film (3) in parallel at regular intervals along the length direction of the electrothermal film (3) in sequence, and then pressing the positive single electrodes (1) and the negative single electrodes (2) on the electrothermal film (3) respectively;
s102, masking the positive single electrode (1) and the negative single electrode (2) which are positioned on the front surface of the electrothermal film (3), spraying carbon-based slurry, and drying;
s103, arranging a first current collector electrode (4) and a second current collector electrode (5) on the back of the electric heating film (3) respectively, riveting one end of the first current collector electrode (4) with the positive single electrode (1), and riveting one end of the second current collector electrode (5) with the negative single electrode (2).
2. The preparation method of the high-power-density rectangular carbon-based electrothermal film according to claim 1, wherein the positive single electrode (1) is a rectangular copper strip with a width of 2-4 mm.
3. The preparation method of the high-power-density rectangular carbon-based electrothermal film according to claim 1, wherein the negative electrode single electrode (2) is a rectangular copper strip with a width of 2-4 mm.
4. The preparation method of the high-power-density rectangular carbon-based electrothermal film according to claim 1, wherein the preparation process of the carbon-based slurry comprises the following steps: adding the carbon nano tube powder into N-methyl pyrrolidone, and ultrasonically stirring to obtain the carbon-based slurry.
5. The preparation method of the high-power-density rectangular carbon-based electrothermal film according to claim 1, wherein the electrothermal film (3) comprises an electrothermal film left end (31) and an electrothermal film right end (32), the positive single electrode (1) comprises a positive single electrode left end (11) and a positive single electrode right end (12), the positive single electrode left end (11) is flush with the front surface of the electrothermal film left end (31), and the positive single electrode right end (12) is folded and pressed on the back surface of the electrothermal film right end (32).
6. The method for preparing the rectangular carbon-based electrothermal film with high power density according to claim 5, wherein the negative single electrode (2) comprises a negative single electrode left end (21) and a negative single electrode right end (22), the negative single electrode right end (22) is flush with the front surface of the electrothermal film right end (32), and the negative single electrode left end (21) is folded and pressed on the back surface of the electrothermal film left end (31).
7. The rectangular carbon-based electric heating film prepared by the preparation method according to any one of claims 1 to 6, characterized in that a plurality of positive single electrodes (1) and a plurality of negative single electrodes (2) are sequentially arranged in parallel on the front surface of the electric heating film (3) along the length direction at equal intervals, the positive single electrodes (1) and the negative single electrodes (2) are respectively pressed on the electric heating film (3), the back surface of the electric heating film (3) is respectively provided with a first current collector electrode (4) and a second current collector electrode (5), the first current collector electrode (4) is riveted with the positive single electrode (1), and the second current collector electrode (5) is riveted with the negative single electrode (2).
8. The rectangular carbon-based electrothermal film according to claim 7, wherein the electrothermal film (3) comprises an electrothermal film left end (31) and an electrothermal film right end (32), the positive single electrode (1) comprises a positive single electrode left end (11) and a positive single electrode right end (12), the positive single electrode left end (11) is flush with the front surface of the electrothermal film left end (31), and the positive single electrode right end (12) is folded and pressed on the back surface of the electrothermal film right end (32).
9. The rectangular carbon-based electrothermal film according to claim 8, wherein the negative electrode single electrode (2) comprises a negative electrode single electrode left end (21) and a negative electrode single electrode right end (22), the negative electrode single electrode right end (22) is flush with the front surface of the electrothermal film right end (32), and the negative electrode single electrode left end (21) is folded and pressed on the back surface of the electrothermal film left end (31).
10. The rectangular carbon-based electrothermal film according to claim 7, wherein the first current collector electrode (4) and the second current collector electrode (5) are rectangular copper strips 6-8 mm wide.
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