CN110890564B - Preparation method of co-heating multi-monomer for thermal battery - Google Patents
Preparation method of co-heating multi-monomer for thermal battery Download PDFInfo
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Abstract
The invention discloses a preparation method of a co-heating multi-monomer for a thermal battery, wherein the co-heating multi-monomer consists of a multi-monomer layer (1), a buffer layer (2) and a heating layer (3), and the preparation method comprises the preparation of a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer. The thermal battery heats multiple monomers together, and the multiple monomers are molded at one time, so that the mechanical strength of the ultrathin monomer sheet can be improved, and the application of the ultrathin monomer sheet process in the high overload field is facilitated; the structure of the single thermal battery is optimized by changing the one-to-one heating mode of the traditional single thermal battery into one-to-many heating mode, so that the efficiency is improved, and the problem of heat mismatching between a heating sheet and an ultrathin single body is avoided; ultrathin insulating layers are coated between the anode-diaphragm and the diaphragm-cathode in the monomer and between the monomers in a rotary blade coating mode, and the ultrathin insulating layers and the monomers form an organic whole, so that the problem of short circuit of the ultrathin monomers is avoided, and the safety of the ultrathin heat supply multi-monomer battery is greatly improved.
Description
Technical Field
The invention belongs to the technical field of thermal battery preparation, and particularly relates to a preparation method of a co-heating multi-monomer for a thermal battery.
Background
The thermal battery is a thermal activation reserve battery, the electrolyte is non-conductive solid when stored at normal temperature, when in use, the heating agent in the thermal battery is ignited by an electric ignition head or a firing pin mechanism, so that the electrolyte is melted into an ion conductor to be activated, the storage time is theoretically unlimited, and the actual measurable value is more than 17 years. Because of its small internal resistance, wide range of use temperature, long storage time, quick and reliable activation and no need of maintenance, it has developed into an ideal power supply for modern weapons.
With the rapid development of the thermal battery field, the preparation method of the thermal battery monomer sheet gradually develops from the traditional powder press forming to the direction of preparing the ultrathin thermal battery monomer sheet by the plasma spraying method, the coating method, the vapor deposition method and the like, the monomer sheet becomes thinner, the contact area of active substances can be effectively increased, the utilization rate of the active substances is improved, and the preparation method is suitable for the development direction of the ultrahigh specific power thermal battery. Patent application 201510054681.4 discloses a method for preparing a thin thermal battery positive electrode-electrolyte-negative electrode-heating powder combined pole piece based on a slurry coating method. The method respectively prepares uniform slurry for the positive electrode, uniform slurry for electrolyte, uniform slurry for the negative electrode and uniform slurry for heating powder of the thermal battery; preparing the uniform slurry of the positive electrode and the uniform slurry of the negative electrode of the thermal battery into a positive electrode plate of the thermal battery and a negative electrode plate of the thermal battery, and preparing a positive electrode-electrolyte combined electrode plate of the thermal battery from the positive electrode plate of the thermal battery and the electrolyte slurry; preparing a thermal battery negative electrode-heating powder combined pole piece by the heating powder uniform slurry and the thermal battery negative electrode pole piece; pressing the thermal battery positive electrode-electrolyte combined pole piece and the thermal battery negative electrode-heating powder combined pole piece together to form a four-in-one thin combined pole piece; the combined pole piece is not limited by the supporting strength of powder, and a large-diameter thin combined pole piece can be manufactured; and the utilization rate of active substances is high, the internal resistance is small, and the preparation of a thermal battery with higher power is facilitated. In addition, the document "preparation and performance of a FeS 2/electrolyte composite film anode for a thermal battery" (chutian, shaohua, and the like, power technology, 2018-07-20) discloses that a FeS 2/electrolyte diaphragm composite film anode is prepared by adopting an ultrasonic spraying technology and a silk-screen printing film thinning process, and the influence of the addition amount of an electrolyte, and different addition amounts of three carbon material conductive agents and conductive agents in the film anode on the discharge performance of a single battery is researched.
The method disclosed by the above documents and other prior arts can prepare ultrathin monomer sheets of thermal batteries, and the specific power of the thermal batteries can also be improved, but due to the thickness, the impact resistance of the monomer sheets is greatly weakened, the mechanical strength is reduced, and the application of the thermal batteries prepared by the advanced technology in the high overload field is seriously influenced. Moreover, because the heating powder in the thermal battery is flammable and explosive, the space requirement for the preparation of the new process is strict, and meanwhile, the potential safety hazard is large, so that the method is not suitable for the preparation process of the ultrathin monomer sheets. However, the traditional heating sheet has a lot of active substance sheets, so that the traditional heating sheet cannot be matched with the ultrathin monomer sheet even if the heat is too high.
Disclosure of Invention
The invention provides a preparation method of a co-heating multi-monomer for a thermal battery, aiming at solving the technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a preparation method of a co-heating multi-monomer for a thermal battery comprises the following steps of preparing a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, wherein the co-heating multi-monomer comprises a multi-monomer layer (1), a buffer layer (2) and a heating layer (3):
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying a pressure of 10-1200 KN for forming to obtain a heating sheet (8);
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
preparing a co-heating multi-monomer: and (2) putting the buffer heating sheet obtained in the step two into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step three, continuously adjusting the height of a die frame and scraping and coating an insulating ring (7) on the edge in the coating process, and after the last layer of coating is finished, condensing, pressure-forming, demoulding and air-drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer.
Further, the multi-monomer layer (1) comprises two or more monomer sheets, and the diameter of the multi-monomer layer is 8mm to 130mm, and the thickness of the multi-monomer layer is 0.3mm to 20 mm.
Further, in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
Further, in the second step, the buffer layer (2) is one or more of a graphite substrate, a high thermal conductivity fiber felt and a metal foil.
Further, in the third step, the fiber short fiber is one or more of high heat conduction carbon fiber, metal fiber and ceramic fiber; the content of the fiber short fiber doped into the slurry is 1-10%, and the length of the fiber short fiber is 0.05-1 mm.
Further, in the step (iv), the adjusting height range of the mold frame is 0.05mm to 1.5mm, and the diameter of the groove of the mold frame is 8mm to 130 mm.
Further, in the step (r), the insulating ring (7) is eucryptite-pulp, the thickness of the insulating ring (7) is 0.05mm to 1.5mm, and the width is 1mm to 8 mm.
Further, in the step (iv), the coating is repeatedly performed in the order of the positive electrode-insulating ring-separator-insulating ring-negative electrode-insulating ring.
Further, in the step (iv), the inert atmosphere is N2And Ar.
Further, the pressure of the press molding is 5KN to 600 KN.
The working principle of the application is as follows: the method adopts a mode that one heating plate heats a plurality of ultrathin monomers together, and the plurality of ultrathin monomers are formed in one step through repeated coating or deposition of the plurality of monomers, so that the plurality of ultrathin monomers form a whole, and the problem of poor mechanical property of the ultrathin monomer plate can be avoided on the premise of not influencing the high specific power performance of the ultrathin monomer plate; through increase high thermal conductivity fibre short fiber and control ultra-thin monomer piece thickness in monomer piece, can improve the heat conductivity of many monomer pieces, prevent that the multimonomer is heated the uneven problem altogether. The buffer layer is additionally arranged, so that the heat conductivity of the multi-monomer in the horizontal plane direction can be improved, and the central area is prevented from being overheated; the ultrathin insulating layers are arranged among the anode-diaphragm, the diaphragm-cathode and the multi-monomer in the monomer in a rotary blade coating mode, so that the short circuit problem of the ultrathin monomer can be avoided, and the safety of the ultrathin heat supply multi-monomer is greatly improved.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the utility model provides a many monomers of thermal battery concurrent heating, with many monomer one shot forming, can improve the mechanical strength of ultra-thin type monomer piece, the application in high overload field of the ultra-thin monomer piece technology of being convenient for.
(2) This application thermal battery heats many monomers altogether, changes into a pair of many heating through heating traditional thermal battery monomer heating mode by a pair one and optimizes thermal battery monomer structure, raises the efficiency, can avoid the problem that heating plate and ultra-thin monomer heat do not match, is suitable for the heating of ultra-thin thermal battery monomer piece.
(3) According to the method, the ultrathin insulating layer is coated between the anode-diaphragm and the diaphragm-cathode in the monomer and among the monomers in a rotary blade coating mode, and the ultrathin insulating layer and the monomers form an organic whole, so that the problem of short circuit of the ultrathin monomer can be avoided, and the safety of the ultrathin heat supply multi-monomer battery is greatly improved.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some examples of the present invention, and for a person skilled in the art, without inventive step, other drawings can be obtained according to these drawings:
FIG. 1 is a schematic diagram of a co-heated multi-cell for a thermal battery of the present application;
FIG. 2 is a schematic structural view of a multi-monomer layer of a co-heated multi-monomer for a thermal battery manufactured in example 1 of the present application;
FIG. 3 is a schematic structural view of a multi-monomer layer of a co-heated multi-monomer for a thermal battery manufactured in examples 2 and 5 of the present application;
FIG. 4 is a schematic structural view of a multi-monomer layer of a co-heated multi-monomer for a thermal battery manufactured in examples 3 and 4 of the present application;
FIG. 5 is a schematic diagram showing a cross section of a unit thermal battery cell of application example 1;
FIG. 6 is a schematic diagram of a cross-section of a unit thermal cell of comparative example 1;
FIG. 7 is a graph of the discharge of a unit thermal battery assembled using the method of example 1;
FIG. 8 is a discharge graph of the unit thermal battery assembled by the method of comparative example 1.
In the drawings: 1-a multi-monomer layer; 2-a buffer layer; 3, heating a layer; 4-negative pole piece; 5-a membrane sheet; 6, positive plate; 7-an insulating ring; 8-heating plate; 9-monomer tablet.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
As shown in fig. 1 and fig. 2, a method for preparing a co-heating multi-monomer for a thermal battery, the co-heating multi-monomer comprises a multi-monomer layer (1), a buffer layer (2) and a heating layer (3), the method for preparing the co-heating multi-monomer comprises the preparation of a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, and specifically comprises the following steps;
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying 10KN pressure for forming to obtain a heating sheet (8); the diameter of the die groove is 8 mm;
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
the buffer layer (2) is a graphite substrate;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
the fiber short fibers are high-heat-conductivity carbon fibers; the content of the fiber short fibers doped into the slurry is 1 percent, and the length of the fiber short fibers is 0.05 mm;
preparing a co-heating multi-monomer: filling the buffer heating sheet obtained in the step II into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step III, continuously adjusting the height of a die frame and scraping an insulating ring (7) in the coating process, and after the last layer of coating is finished, condensing, pressure forming, demoulding and air drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer;
the diameter of the groove of the die is 8 mm; the height adjusting range of the die frame is 0.05 mm; the insulating ring (7) is eucryptite-paper pulp, the thickness of the insulating ring (7) is 0.05mm, and the width of the insulating ring is 1 mm; the coating is repeatedly carried out according to the sequence of the anode, the insulating ring, the diaphragm, the insulating ring, the cathode and the insulating ring; the inert atmosphere is N2And Ar; the pressure of the pressure forming is 5 KN.
Further, the multi-monomer layer (1) comprises two monomer sheets, the diameter of the multi-monomer layer is 8mm, and the thickness of the multi-monomer layer is 0.3 mm; in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
Example 2
As shown in fig. 1 and fig. 3, a method for preparing a co-heating multi-monomer for a thermal battery, the co-heating multi-monomer comprises a multi-monomer layer (1), a buffer layer (2) and a heating layer (3), the method for preparing the co-heating multi-monomer comprises the preparation of a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, and specifically comprises the following steps;
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying 1200KN pressure for forming to obtain a heating sheet (8); the diameter of the die groove is 130 mm;
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
the buffer layer (2) is a high-thermal-conductivity fiber felt;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
the fiber short fibers are metal fibers; the content of the fiber short fibers doped into the slurry is 10%, and the length of the fiber short fibers is 1 mm;
preparing a co-heating multi-monomer: filling the buffer heating sheet obtained in the step II into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step III, continuously adjusting the height of a die frame and scraping an insulating ring (7) in the coating process, and after the last layer of coating is finished, condensing, pressure forming, demoulding and air drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer;
the diameter of the die groove is 130 mm; the height adjusting range of the die frame is 1.5 mm; the insulating ring (7) is eucryptite-paper pulp, the thickness of the insulating ring (7) is 1.5mm, and the width of the insulating ring is 8 mm; the coating is repeatedly carried out according to the sequence of the anode, the insulating ring, the diaphragm, the insulating ring, the cathode and the insulating ring; the inert atmosphere is N2And Ar; the pressure of the pressing forming is 600 KN.
Further, the multi-monomer layer (1) contains three monomer sheets, the diameter of the multi-monomer layer is 130mm, and the thickness of the multi-monomer layer is 20 mm; in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
Example 3
As shown in fig. 1 and 4, the preparation method of the co-heating multi-monomer for the thermal battery comprises the steps of preparing a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, wherein the co-heating multi-monomer comprises a multi-monomer layer (1), a buffer layer (2) and a heating layer (3);
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying 560KN pressure for forming to obtain a heating sheet (8); the diameter of the die groove is 60 mm;
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
the buffer layer (2) is a metal foil;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
the fiber short fibers are ceramic fibers; the content of the fiber short fibers doped into the slurry is 2%, and the length of the fiber short fibers is 0.1 mm;
preparing a co-heating multi-monomer: filling the buffer heating sheet obtained in the step II into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step III, continuously adjusting the height of a die frame and scraping an insulating ring (7) in the coating process, and after the last layer of coating is finished, condensing, pressure forming, demoulding and air drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer;
the diameter of the die groove is 60 mm; the height adjusting range of the die frame is 0.1 mm; the insulating ring (7) is eucryptite-paper pulp, the thickness of the insulating ring (7) is 0.1mm, and the width of the insulating ring is 5 mm; the coating is repeatedly carried out according to the sequence of the anode, the insulating ring, the diaphragm, the insulating ring, the cathode and the insulating ring; the inert atmosphere is N2And Ar; the pressure of the pressing forming is 250 KN.
Further, the multi-monomer layer (1) contains five monomer sheets, the diameter of the multi-monomer layer is 60mm, and the thickness of the multi-monomer layer is 1.5 mm; in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
Example 4
As shown in fig. 1 and 4, the preparation method of the co-heating multi-monomer for the thermal battery comprises the steps of preparing a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, wherein the co-heating multi-monomer comprises a multi-monomer layer (1), a buffer layer (2) and a heating layer (3);
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying a pressure of 400KN for forming to obtain a heating sheet (8); the diameter of the die groove is 45 mm;
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
the buffer layer (2) is a graphite substrate and a high-thermal-conductivity fiber felt;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
the fiber short fibers are high-heat-conductivity carbon fibers and metal fibers; the content of the fiber short fibers doped into the slurry is 9 percent, and the length of the fiber short fibers is 0.9 mm;
preparing a co-heating multi-monomer: filling the buffer heating sheet obtained in the step II into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step III, continuously adjusting the height of a die frame and scraping an insulating ring (7) in the coating process, and after the last layer of coating is finished, condensing, pressure forming, demoulding and air drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer;
the diameter of the die is 45 mm; the height adjusting range of the die frame is 0.1 mm; the insulating ring (7) is eucryptite-paper pulp, the thickness of the insulating ring (7) is 0.1mm, and the width of the insulating ring is 2 mm; the coating is repeatedly carried out according to the sequence of the anode, the insulating ring, the diaphragm, the insulating ring, the cathode and the insulating ring; the inert atmosphere is N2And Ar; the pressure of the pressing forming is 200 KN.
Further, the multi-monomer layer (1) contains five monomer sheets, the diameter of the multi-monomer layer is 45mm, and the thickness of the multi-monomer layer is 1.5 mm; in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
Example 5
As shown in fig. 1 and fig. 3, a method for preparing a co-heating multi-monomer for a thermal battery, the co-heating multi-monomer comprises a multi-monomer layer (1), a buffer layer (2) and a heating layer (3), the method for preparing the co-heating multi-monomer comprises the preparation of a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, and specifically comprises the following steps;
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying 600KN pressure for forming to obtain a heating sheet (8); the diameter of the die is 64 mm;
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
the buffer layer (2) is made of high-thermal-conductivity fiber felt and metal foil;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
the fiber short fibers are high-heat-conductivity carbon fibers and ceramic fibers; the content of the fiber short fibers doped into the slurry is 5%, and the length of the fiber short fibers is 0.5 mm;
preparing a co-heating multi-monomer: filling the buffer heating sheet obtained in the step II into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step III, continuously adjusting the height of a die frame and scraping an insulating ring (7) in the coating process, and after the last layer of coating is finished, condensing, pressure forming, demoulding and air drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer;
the diameter of the die groove is 64 mm; the height adjusting range of the die frame is 0.3 mm; the insulating ring (7)) Is eucryptite-paper pulp, the thickness of the insulating ring (7) is 0.3mm, and the width is 3 mm; the coating is repeatedly carried out according to the sequence of the anode, the insulating ring, the diaphragm, the insulating ring, the cathode and the insulating ring; the inert atmosphere is N2And Ar; the pressure of the pressing forming is 300 KN.
Further, the multi-monomer layer (1) contains three monomer sheets, the diameter of the monomer layer is 64mm, and the thickness of the monomer layer is 0.9 mm; in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
To further illustrate that the present invention can achieve the technical effects, the following experiments were performed:
application example 1
The co-heating multi-monomer prepared in the embodiment 5 is used for preparing a thermal battery, the thickness of the co-heating multi-monomer is 5.1mm, 9 co-heating multi-monomers are connected in series to prepare a unit thermal battery, the height of a battery stack is 45mm, and the height of the unit thermal battery is 65 mm; the positive electrode powder of the thermal battery is FeS2The diaphragm material is LiCl-LiBr-KBr, the negative electrode material is lithium-rich LiSi alloy powder, the slurry is epoxy resin-ethanol, and the schematic cross-sectional view of the monomer is shown in FIG. 5. The unit thermal battery is arranged on an impact vibration table, constant current discharge is carried out according to 10A by adopting a 30KW comprehensive discharge test system, an acceleration of 30g is axially loaded in the discharge process, a 1500g impact response spectrum is loaded every 10s, and the discharge curve of the unit thermal battery is shown in FIG. 7. As can be seen from the figure, under the impact of mechanical conditions, the voltage of the unit thermal battery is stable, the unit thermal battery works normally, the peak voltage of the battery is 53.99V, and the voltage of one co-heating multi-monomer is 2.0V, which shows that the co-heating multi-monomer has good impact resistance mechanical property and safety performance.
Comparative example 1
A unit heat battery was fabricated according to a conventional one-to-one heating coating method, and a cell having a thickness of 2.6mm was fabricated, and a schematic cross-sectional view of the cell is shown in FIG. 6. A unit cell was assembled using 27 cells, and other raw materials were the same as those in test method and application example 1, with a stack height of 70mm and a unit cell height of 90mm, and a unit cell discharge curve as shown in FIG. 8. As can be seen from the figure, after the unit cell voltage is 15s, the cell voltage is obviously reduced, and the voltage is slowly increased at the later period, which may be related to the self-repairing of the battery. After 20s, the voltage curve fluctuates sharply, the voltage drops rapidly, and short circuit occurs inside the unit cell. The peak voltage of the battery is 54.23V, and the voltage of one monomer is 2.01V, which is slightly higher than that of the co-heating monomer.
Comparing the results of the application example 1 and the comparative example 1, it can be seen that the unit thermal battery prepared by using the co-heated multi-monomer discharges under the condition of mechanical impact environment, and the mechanical property and the safety performance of the unit battery are greatly improved by sacrificing the peak voltage of 0.01V although the monomer voltage is slightly lower than that of the unit thermal battery prepared by heating 1 to 1, which is very beneficial to the battery adapting to high-strength working environment. In addition, the height of the structure adopting 1 pair of multi-co-heating multi-monomer is reduced by 27.8 percent, which accords with the development trend of miniaturized batteries.
In summary, the thermal battery heats multiple monomers together, and the multiple monomers are molded at one time, so that the mechanical strength of the ultrathin monomer sheet can be improved, and the application of the ultrathin monomer sheet process in the high overload field is facilitated; the structure of the single thermal battery is optimized by changing the one-to-one heating mode of the traditional single thermal battery into one-to-many heating mode, so that the efficiency is improved, the problem of heat mismatching between a heating sheet and an ultrathin single thermal battery can be avoided, and the method is suitable for heating the ultrathin single thermal battery; ultrathin insulating layers are coated between the anode-diaphragm and the diaphragm-cathode in the monomer and between the monomers in a rotary blade coating mode, and the ultrathin insulating layers and the monomers form an organic whole, so that the problem of short circuit of the ultrathin monomer can be avoided, and the safety of the ultrathin heat supply multi-monomer battery is greatly improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A preparation method of a co-heating multi-monomer for a thermal battery is characterized by comprising the following steps: the preparation method of the co-heating multi-monomer comprises the preparation of a heating sheet, a buffer heating sheet, a positive electrode, a negative electrode, a diaphragm and the co-heating multi-monomer, and specifically comprises the following steps:
preparation of a heating sheet: pouring the thermal battery heating powder into a mould, and applying a pressure of 10-1200 KN for forming to obtain a heating sheet (8);
preparing a buffering heating sheet: spraying a conductive adhesive on the surface of the heating sheet (8) prepared in the step I, and then adhering the buffer layer (2) on the surface of the heating sheet (8) to obtain a buffer heating sheet;
preparing a positive electrode, a negative electrode and a diaphragm: respectively preparing anode slurry, diaphragm slurry and cathode slurry from the monomer anode powder, the diaphragm powder and the cathode powder of the thermal battery, doping fiber short fibers into the slurries, and uniformly stirring to obtain anode fiber monomer slurry, diaphragm fiber monomer slurry and cathode fiber monomer slurry;
preparing a co-heating multi-monomer: filling the buffer heating sheet obtained in the step II into a die, spraying a conductive adhesive on the surface of the buffer heating sheet, coating the positive fiber monomer slurry, the diaphragm fiber monomer slurry and the negative fiber monomer slurry which are prepared in the step III, continuously adjusting the height of a die frame and scraping and coating an insulating ring (7) on the edge in the coating process, and after the last layer of coating is finished, condensing, pressure-forming, demoulding and air-drying the mixture under the protection of inert atmosphere to obtain the co-heating multi-monomer;
in the second step, the buffer layer (2) is one or more of a graphite substrate, a high-heat-conductivity fiber felt and a metal foil;
in the step (iv), the coating is repeated in the order of the positive electrode-the insulating ring-the separator-the insulating ring-the negative electrode-the insulating ring.
2. The method of claim 1, wherein the method comprises the steps of: the multi-monomer layer (1) comprises two or more monomer sheets, the diameter of the multi-monomer layer is 8 mm-130 mm, and the thickness of the multi-monomer layer is 0.3 mm-20 mm.
3. The method of claim 1, wherein the method comprises the steps of: in the second step and the fourth step, the conductive adhesive is conductive carbon adhesive.
4. The method of claim 1, wherein the method comprises the steps of: in the third step, the fiber short fiber is one or more of high heat conduction carbon fiber, metal fiber and ceramic fiber; the mass percentage content of the fiber short fiber doped into the slurry is 1-10%, and the length of the fiber short fiber is 0.05-1 mm.
5. The method of claim 1, wherein the method comprises the steps of: in the step (iv), the adjusting height range of the die frame is 0.05 mm-1.5 mm, and the diameter of the groove of the die frame is 8 mm-130 mm.
6. The method of claim 1, wherein the method comprises the steps of: in the step (iv), the insulating ring (7) is eucryptite-paper pulp, the thickness of the insulating ring (7) is 0.05 mm-1.5 mm, and the width is 1 mm-8 mm.
7. The method of claim 1, wherein the method comprises the steps of: in the step (iv), the inert atmosphere is N2And Ar.
8. The method of claim 1, wherein the method comprises the steps of: the pressure of the pressure forming is 5 KN-600 KN.
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| CN111430742B (en) * | 2020-05-22 | 2022-07-22 | 贵州梅岭电源有限公司 | High-conductivity heating sheet for thermal battery, preparation method and application |
| CN112829406A (en) * | 2020-12-10 | 2021-05-25 | 上海空间电源研究所 | Hollow rubber composite pad for lithium ion battery pack |
| CN114122441A (en) * | 2021-11-05 | 2022-03-01 | 潍坊科技学院 | Nickel powder carved carbon fiber thermal battery substrate and preparation method and application thereof |
| CN114464825A (en) * | 2021-12-30 | 2022-05-10 | 贵州梅岭电源有限公司 | Low-internal-resistance thermal battery cell stack and preparation method thereof |
| CN114597433A (en) * | 2022-03-02 | 2022-06-07 | 贵州梅岭电源有限公司 | Composite sheet structure for reducing activation time of thermal battery and preparation method thereof |
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