CN113113673A - Self-heating battery cell and preparation method thereof - Google Patents
Self-heating battery cell and preparation method thereof Download PDFInfo
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- CN113113673A CN113113673A CN202110520088.XA CN202110520088A CN113113673A CN 113113673 A CN113113673 A CN 113113673A CN 202110520088 A CN202110520088 A CN 202110520088A CN 113113673 A CN113113673 A CN 113113673A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to a power battery and an internal heating battery cell thereof, in particular to a self-heating battery cell. Specifically include shell, electric core and closing cap, shell and the inside chamber of sealing that is used for placing electric core inner core that forms of closing cap cooperation wherein still include graphite alkene heating film, parcel electric core inner core, it is used for to generate heat after graphite alkene heating film circular telegram electric core inner core heating, graphite alkene heating film includes substrate, first power supply line, second power supply line, conduction band and graphite alkene material that generates heat, the material that generates heat is coated with graphite alkene on the substrate, substrate printed conduction band, first power supply line and second power supply line all with conduction band is connected. The distance between the heating body and the heated body is shortened by heating the inside of the battery cell shell, so that the heat conduction mode is completely sufficient, the temperature rise of the battery cell active material is fast, the preheating time is short, the capacity and the discharge multiplying power of the power battery are favorably and rapidly improved, and the low-temperature performance of the power battery is fundamentally improved.
Description
Technical Field
The invention relates to a power battery and an internal heating battery cell thereof, in particular to a self-heating battery cell and a preparation method thereof.
Background
According to the requirements of national policies and energy conservation and emission reduction, the new energy automobile develops rapidly, the electric automobile is developed rapidly as the main force of the new energy automobile, and the power battery and the battery cell industry thereof are also developed rapidly. With the wide application of power batteries, the low-temperature performance defects of the power batteries gradually appear. Under a low-temperature environment, most batteries, particularly common lithium ion batteries, have the defects of battery capacity attenuation, discharge rate reduction and mileage shrinkage. Some lithium ions are separated out to form lithium metal crystals even because the ambient temperature is too low, and lithium dendrites are formed to pierce the diaphragm, so that the internal short circuit of the power battery is caused, and spontaneous combustion or explosion accidents are caused. Therefore, in a low-temperature environment, the power battery needs to be heated in advance before being used or charged, and the heating and temperature control are needed even during the use process so as to maintain various performances of the power battery.
At present, all heating methods adopted for batteries are heating outside a battery core, that is, heating a battery core outside a battery core shell, or heating a battery pack outside the battery pack, or a combination of the two heating methods. The above-mentioned electric core is called external heating electric core. The external heating battery cell and the external heating method thereof have the defects that the heating space range is large, the heat radiation and heat convection heat conduction paths are blocked by the battery cell shell and the battery pack shell, the effective utilization efficiency of heat is low, and the energy consumption is high; the temperature of the active material of the battery core which needs to be heated really is slowly increased, the heating inside the battery core and between the battery cores is not uniform, and the improvement of the low-temperature performance of the power battery is influenced. And, because the heating path is long, uncontrollable factors are many, and the battery management difficulty is large.
Disclosure of Invention
The present invention is directed to overcoming the deficiencies of the prior art by providing a self-heating cell battery that utilizes internal heating to solve the above problems.
The technical scheme of the invention is as follows: a self-heating cell battery comprising:
shell, electric core and closing cap, the inside seal chamber that is used for placing electric core that forms of shell and closing cap cooperation, wherein still include:
the graphene heating film wraps the electric core inner core, and the graphene heating film is used for heating the electric core inner core after being electrified.
As a further improvement of the technical scheme of the invention, the graphene heating film comprises a base material, a first power supply line, a second power supply line, a conductive band and a graphene heating material, wherein the graphene heating material is coated on the base material, the conductive band is printed on the base material, and the first power supply line and the second power supply line are both connected with the conductive band.
As a further improvement of the technical solution of the present invention, the cell core is one of a cell roll and a sheet-shaped cell.
As a further improvement of the technical solution of the present invention, the self-heating cell battery includes a winding drum cylindrical self-heating cell battery containing a cell roll and a laminated square self-heating cell battery containing a sheet-like cell.
A reel cylinder self-heating battery cell comprises a first battery cell shell, a battery cell coil, a first sealing cover and a graphene heating film wrapping the battery cell coil; the battery core coil comprises a positive electrode material, a diaphragm and a negative electrode material, wherein the positive electrode material, the diaphragm, the negative electrode material and the diaphragm are sequentially overlapped and wound into a vortex shape, the battery core coil is arranged in a first battery core shell, the first battery core shell is connected with a first sealing cover, and a first electrolyte tank is formed by gaps among the first battery core shell, the positive electrode material, the diaphragm and the negative electrode material and is used for injecting electrolyte;
the first sealing cover comprises a first wire hole, a second wire hole and an anode, the first wire hole and the second wire hole are formed in the first sealing cover and used for enabling the first power supply wire and the second power supply wire to penetrate through the first sealing cover and extend to the outside, a safety valve is arranged in the middle of the first sealing cover and used for relieving pressure of gas generated by abnormal high temperature of the battery cell to avoid explosion, and the upper surface of the first sealing cover is provided with the raised anode;
the positive electrode material is connected with a positive electrode lug, and the positive electrode lug is welded with a metal piece connected with the positive electrode; the negative electrode material is connected with the negative electrode lug, and the negative electrode lug is welded with the negative electrode.
As a further improvement of the technical scheme of the invention, a shell neck groove is arranged at the end part close to the opening of the first battery cell shell, and a neck ring is formed inwards in the shell neck groove and used for supporting the first sealing cover.
As a further improvement of the technical scheme of the invention, the width of the negative electrode material is 0.5-1.5 mm wider than that of the positive electrode material; the negative electrode material is 5-10 mm longer than the positive electrode material, and lithium precipitation is prevented.
As a further improvement of the technical scheme of the invention, the diaphragm must completely separate the positive and negative pole pieces, the width of the diaphragm is usually 0.5-1.0 mm wider than that of the negative pole material, and the length of the diaphragm is usually 1-2.0 mm wider than that of the negative pole material, so that the positive and negative pole pieces are prevented from contacting and being in short circuit.
According to the technical scheme, the length size of the graphene heating film is 3-10 mm smaller than the perimeter size of the battery cell coil, so that the conductive strips are prevented from being overlapped, leaking and being short-circuited; the width dimension of graphite alkene heating film is less than the height dimension of electric core book by 0.5 ~ 2.0mm, is convenient for fixed graphite alkene heating film.
A laminated square self-heating battery cell comprises a second cell shell, a sheet-shaped cell and a second cover, and further comprises a graphene heating film wrapping the sheet-shaped cell; the laminated battery cell comprises a laminated positive electrode material, a laminated diaphragm, a laminated negative electrode material and a second electrolyte tank, wherein the laminated diaphragm, the laminated positive electrode material, the laminated diaphragm and the laminated negative electrode material are sequentially stacked, an electrode cover is arranged on the upper part of the laminated battery cell and used for connecting the head end of the laminated positive electrode material to the laminated positive electrode and connecting the tail end of the laminated negative electrode material to the laminated negative electrode, the laminated positive electrode material and the laminated negative electrode material are sequentially connected in series, the laminated battery cell is arranged in a second battery cell shell, and the second battery cell shell is connected with a second sealing cover;
the second closing cap includes third line hole, fourth line hole and annotates the liquid hole, third line hole and fourth line hole set up on the second closing cap for first power supply line and second power supply line are worn out the second closing cap extends to the outside, the second closing cap is provided with annotates the liquid hole.
The invention also provides a method for preparing a drum-type cylindrical self-heating battery cell, which comprises the following steps:
sequentially overlapping the positive electrode material, the diaphragm, the negative electrode material and the diaphragm, winding, and edge sealing to obtain a battery core roll;
wrapping the cell coil with a graphene heating film, and fixing the graphene heating film to obtain a graphene cell coil;
placing the graphene battery cell coil into a first battery cell shell, and performing short circuit inspection after spot welding of a negative electrode;
baking the first cell shell filled with the graphene cell coil, and injecting an electrolyte into the first cell shell;
leading the first power supply line and the second power supply line to pass through the first line hole and the second line hole on the first sealing cover, and then spot-welding the positive electrode;
insulating and sealing the first line hole and the second line hole, and sealing the gland to obtain a semi-finished product of the self-heating battery cell;
cleaning, drying and storing the self-heating battery cell semi-finished product, and detecting the alignment degree of the self-heating battery cell semi-finished product;
performing shell code spraying, formation, OCV (Open Circuit Voltage) test and capacity grading on the qualified semi-finished product of the self-heating battery cell to obtain a finished product of the self-heating battery cell;
and (4) performing appearance full inspection on the self-heating battery cell finished product, spraying grade codes, scanning grades, packaging and warehousing.
Further, the preparation steps of the cathode material are as follows:
s111, carrying out ingredient homogenization on the positive electrode active material, and then coating the homogenized and mixed coating material on a base material;
s112, rolling the base material and then cutting into polar bands;
s113, baking the polar band, and welding a polar lug on the baked polar band;
s114, carrying out protective glue treatment on the connecting part of the tab and the polar belt to obtain a positive electrode material;
further, the preparation steps of the anode material are as follows:
s121, blending and homogenizing the negative active material, and then coating the homogenized and mixed coating material on a base material;
s122, rolling the base material and then cutting into polar bands;
s123, baking the polar band, and welding a polar lug on the baked polar band;
s124, carrying out protective glue treatment on the connection part of the tab and the polar band to obtain a negative electrode material;
the preparation steps of the graphene heating film are as follows:
s131, carrying out ingredient homogenization on the graphene electric heating material, and then coating the homogenized and mixed coating material on a base material;
s132, printing a silver paste conductive tape on the base material to obtain a semi-finished product heating film;
s133, slicing the semi-finished heating film;
and S134, welding a power supply line to the sliced semi-finished product heating film, and performing insulation packaging to obtain the graphene heating film.
The invention also provides a method for preparing a laminated square self-heating cell battery, which comprises the following steps:
sequentially stacking the laminated diaphragm, the laminated positive electrode material, the laminated diaphragm and the laminated negative electrode material, and carrying out flat pressing to obtain a pretreated product;
welding a tab on the pretreated product, and performing edge sealing and rubberizing treatment to obtain a sheet-shaped battery cell;
wrapping the sheet-shaped battery cell with a graphene heating film, and fixing the graphene heating film to obtain a graphene sheet-shaped battery cell;
placing the graphene sheet-shaped cell into a second cell shell;
leading the first power supply line and the second power supply line to pass through a third line hole and a fourth line hole on the second sealing cover;
carrying out insulation sealing on the first line hole and the second line hole, and carrying out gland sealing treatment to obtain an intermediate product;
injecting an electrolyte into the intermediate product through the injection hole;
pre-melting, pumping, sealing and injecting the liquid hole to obtain a semi-finished product of the self-heating battery cell;
carrying out formation, capacity grading and OCV (oil control valve) test on the self-heating battery cell semi-finished product to obtain a self-heating battery cell finished product;
carrying out appearance full inspection, packaging and warehousing on the self-heating battery cell finished product;
further, the preparation steps of the laminated positive electrode material are as follows:
s111, carrying out ingredient homogenization on the positive electrode active material, and then coating the homogenized and mixed coating material on a base material;
s112, cutting the base material into polar bands;
s113, continuously rolling the polar band;
s114, die cutting is carried out on the rolled polar band, tabs are welded, and protective glue treatment is carried out on the connecting portion of the tabs and the polar band, so that a laminated positive electrode material is obtained;
further, the preparation steps of the laminated anode material are as follows:
s121, blending and homogenizing the negative active material, and then coating the homogenized and mixed coating material on a base material;
s122, cutting the base material into polar bands;
s123, continuously rolling the polar band;
s124, die cutting is carried out on the rolled pole band, a pole lug is welded, and protective glue treatment is carried out on the connection part of the pole lug and the pole band, so that the cathode material laminated cathode material is obtained;
further, the preparation steps of the graphene heating film are as follows:
s131, carrying out ingredient homogenization on the graphene electric heating material, and then coating the homogenized and mixed coating material on a base material;
s132, printing a silver paste conductive tape on the base material to obtain a semi-finished product heating film;
s133, slicing the semi-finished heating film;
and S134, welding a power supply line to the sliced semi-finished product heating film, and performing insulation packaging to obtain the graphene heating film.
The invention has the advantages that:
1. the heating is carried out in the battery cell shell, the distance between the heating body and the heated body is short, and the heat conduction mode is completely sufficient, so that the temperature rise of the battery cell active material is fast, the preheating time is short, and the capacity and the discharge multiplying power of the power battery are favorably and rapidly improved, thereby fundamentally improving the low-temperature performance of the power battery and further improving the overall performance of the electric automobile.
2. Because the heating is carried out in the battery cell shell, the heating space is small, the heating efficiency is high, the heating energy consumption is low, the non-power energy consumption can be greatly reduced, and the optimal temperature required by the power battery can be maintained for a long time.
3. Because graphite alkene heating film has the temperature limit heating characteristic, can heat the electric core temperature limit, even battery management system breaks down, the power battery also can not produce the overheat phenomenon because of the heating, and the heating security is good.
4. The structure is simple, the weight of the non-electric core of the battery pack can be greatly reduced, and the energy density of the battery pack is favorably improved.
Drawings
FIG. 1 is a schematic view of example 2 of the present invention;
fig. 2 is a schematic diagram of a first cell casing in embodiment 2 of the present invention;
FIG. 3 is a schematic structural diagram of a graphene heating film according to the present invention;
fig. 4 is a schematic diagram of layering of a cell roll in embodiment 2 of the present invention;
fig. 5 is a diagram of a package of a cylindrical self-heating cell battery according to embodiment 2 of the present invention;
fig. 6 is a diagram of a laminated square self-heating cell battery package according to example 3 of the present invention;
fig. 7 is a schematic diagram of a sheet-shaped cell structure in embodiment 3 of the present invention;
reference numerals: the battery comprises a first battery cell shell 100, a shell neck groove 101, a negative electrode 102, a graphene heating film 110, a first power supply line 111, a second power supply line 112, a conductive strip 113, a graphene heat-generating material 114, a battery cell roll 120, a positive electrode material 121, a diaphragm 122, a negative electrode material 123, a first electrolyte tank 124, a first cover 130, a first wire hole 131, a safety valve 132, a positive electrode 133, a second wire hole 134, a second battery cell shell 200, a sheet-shaped battery cell 220, a laminated positive electrode material 221, a laminated diaphragm 222, a laminated negative electrode material 223, a second electrolyte tank 224, an electrode cover 225, a second cover 230, a laminated positive electrode 231, a laminated negative electrode 232, a liquid injection hole 233, a third wire hole 234, and a fourth wire hole 235.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Embodiment 1, a self-heating electric core battery, including shell, electric core and closing cap, shell and closing cap cooperation inside form one and be used for placing the seal chamber of electric core inner core, and wherein still include graphite alkene heating film 110, parcel electric core inner core, graphite alkene heating film 110 generates heat after the circular telegram and is used for giving electric core inner core heating.
In this embodiment, the graphene heating film 110 includes a base material, a first power supply line 111, a second power supply line 112, a conductive tape 113, and a graphene heat-generating material 114, the graphene heat-generating material 114 is coated on the base material, the conductive tape 113 is printed on the base material, and both the first power supply line 111 and the second power supply line 112 are connected to the conductive tape 113.
In the present embodiment, the cell core may be one of a cell roll 120 and a sheet-shaped cell 220; the self-heating battery cell comprises a winding drum cylindrical self-heating battery cell containing a battery cell coil and a laminated square self-heating battery cell containing a sheet-shaped battery cell.
Embodiment 2, referring to fig. 1 to fig. 5, a reel-cylinder self-heating battery cell is provided based on embodiment 1, and includes a first cell casing 100, a cell roll 120, a first cover 130, and a graphene heating film 110 wrapping the cell roll 120; the battery cell roll 120 includes a positive electrode material 121, a diaphragm 122 and a negative electrode material 123, the positive electrode material 121, the diaphragm 122, the negative electrode material 123 and the diaphragm 122 are sequentially stacked and wound into a spiral shape, the battery cell roll 120 is disposed in a first battery cell casing 100, the first battery cell casing 100 is connected with a first cover 130, and a first electrolyte tank 124 is formed by a gap among the first battery cell casing 100, the positive electrode material 121, the diaphragm 122 and the negative electrode material 123 and is used for injecting electrolyte.
In this embodiment, the first cover 130 includes a first wire hole 131, a second wire hole 134 and a positive electrode 133, the first cover 130 is provided with the first wire hole 131 and the second wire hole 134 for the first power supply wire 111 and the second power supply wire 112 to penetrate through the first cover 130 and extend to the outside, the middle of the first cover 130 is provided with a safety valve 132, and the upper surface of the first cover 130 is provided with the convex positive electrode 133.
In this embodiment, the positive electrode material 121 is connected to a positive electrode tab, and the positive electrode tab is welded to a metal member connected to the positive electrode 133; the negative electrode material 123 is connected to a negative electrode tab, which is welded to the negative electrode 102.
In this embodiment, a casing neck groove 101 is provided near the opening end of the first cell casing 100, and the casing neck groove 101 forms a collar inward for holding the first cover 130.
Specifically, the width of the negative electrode material 123 is 0.5-1.5 mm larger than that of the positive electrode material 121; the negative electrode material 123 is 5-10 mm longer than the positive electrode material 121, and lithium precipitation output is prevented.
Specifically, the length dimension of the graphene heating film 110 is 3-10 mm smaller than the perimeter dimension of the battery cell roll 120, so that the conductive strips are prevented from overlapping, leaking and being short-circuited; the width dimension of the graphene heating film 110 is smaller than the height dimension of the battery cell coil 120 by 0.5-2.0 mm, so that the graphene heating film is convenient to fix.
The invention also provides a method for preparing a drum-type cylindrical self-heating battery cell, which comprises the following steps: sequentially overlapping the positive electrode material 121, the diaphragm 122, the negative electrode material 123 and the diaphragm 122, winding, and sealing edges to obtain a battery cell roll 120;
wrapping the cell coil 120 with a graphene heating film 110, and fixing the graphene heating film 110 to obtain a graphene cell coil;
placing the graphene battery cell coil into a first battery cell shell 100, and performing short circuit inspection after spot welding of a negative electrode 102;
baking the first cell shell 100 filled with the graphene cell coil, and injecting an electrolyte into the first cell shell 100;
the first and second feeder lines 111 and 112 are led through the first and second wire holes 131 and 134 on the first cover 130, and then the positive electrode 133 is spot-welded;
insulating and sealing the first wire hole 131 and the second wire hole 134, and performing gland sealing treatment to obtain a semi-finished product of the self-heating battery cell;
cleaning, drying and storing the self-heating battery cell semi-finished product, and detecting the alignment degree of the self-heating battery cell semi-finished product;
carrying out shell body code spraying, formation, OCV (open circuit control) testing and capacity grading on the qualified semi-finished product of the self-heating battery cell to obtain a finished product of the self-heating battery cell;
performing appearance full inspection on the self-heating battery cell finished product, spraying grade codes, performing grade scanning, packaging and warehousing;
the preparation steps of the positive electrode material 121 are as follows:
s111, carrying out ingredient homogenization on the positive electrode active material, and then coating the homogenized and mixed coating material on a base material;
s112, rolling the base material and then cutting into polar bands;
s113, baking the polar band, and welding a polar lug on the baked polar band;
s114, carrying out protective glue treatment on the connection part of the tab and the polar belt to obtain a positive electrode material 121;
the preparation steps of the negative electrode material 123 are as follows:
s121, blending and homogenizing the negative active material, and then coating the homogenized and mixed coating material on a base material;
s122, rolling the base material and then cutting into polar bands;
s123, baking the polar band, and welding a polar lug on the baked polar band;
s124, carrying out protective glue treatment on the connecting part of the tab and the polar band to obtain a negative electrode material 123;
the preparation steps of the graphene heating film 110 are as follows:
s131, carrying out ingredient homogenization on the graphene electric heating material, and then coating the homogenized and mixed coating material on a base material;
s132, printing a silver paste conductive tape on the base material to obtain a semi-finished product heating film;
s133, slicing the semi-finished heating film;
and S134, welding a power supply line to the sliced semi-finished heating film, and performing insulation packaging to obtain the graphene heating film 110.
Example 3, referring to fig. 6 and 7, a laminated prismatic self-heating cell battery is provided in accordance with example 1: the laminated battery cell comprises a second battery cell shell 200, a laminated battery cell 220 and a second cover 230, and further comprises a graphene heating film 110 wrapping the laminated battery cell 220, wherein the laminated battery cell 220 comprises a laminated positive electrode material 221, a laminated diaphragm 222, a laminated negative electrode material 223 and a second electrolyte tank 224, the laminated diaphragm 222, the laminated positive electrode material 221, the laminated diaphragm 222 and the laminated negative electrode material 223 are sequentially stacked, an electrode cover 225 is arranged on the upper portion of the laminated battery cell 220 and used for connecting the head end of the laminated positive electrode material 221 to a laminated positive electrode 231 and connecting the tail end of the laminated negative electrode material 223 to a laminated negative electrode 232, the laminated positive electrode material 221 and the laminated negative electrode material 223 are sequentially connected in series, the laminated battery cell 220 is arranged in the second battery cell shell 200, and the second battery cell shell 200 is connected with the second cover 230.
In this embodiment, the second cover 230 includes a third wire hole 234, a fourth wire hole 235 and a liquid injection hole 233, the third wire hole 234 and the fourth wire hole 235 are disposed on the second cover 230 for the first power supply line 111 and the second power supply line 112 to penetrate through the second cover 230 and extend to the outside, and the second cover 230 is provided with the liquid injection hole 233.
The invention also provides a method for preparing a laminated square self-heating cell battery, which comprises the following steps: sequentially stacking the laminated diaphragm 222, the laminated positive electrode material 221, the laminated diaphragm 222 and the laminated negative electrode material 223, and performing flat pressing to obtain a pretreated product;
welding a tab on the pretreated product, and performing edge sealing and rubberizing treatment to obtain a sheet-shaped battery cell 220;
wrapping the sheet-shaped battery cell 220 with a graphene heating film 110, and fixing the graphene heating film 110 to obtain a graphene sheet-shaped battery cell;
placing the graphene sheet-like cell into a second cell housing 200;
leading the first and second power supply lines 111 and 112 through the third and fourth wire holes 234 and 235 on the second cover 230;
performing insulation sealing on the first line hole 131 and the second line hole 134, and performing gland sealing treatment to obtain an intermediate product;
injecting electrolyte into the intermediate product through the injection hole 233;
pre-melting, pumping, sealing and injecting the liquid hole to obtain a semi-finished product of the self-heating battery cell;
carrying out formation, capacity grading and OCV (oil control valve) test on the self-heating battery cell semi-finished product to obtain a self-heating battery cell finished product;
carrying out appearance full inspection, packaging and warehousing on the self-heating battery cell finished product;
the preparation steps of the laminated positive electrode material 221 are as follows:
s111, carrying out ingredient homogenization on the positive electrode active material, and then coating the homogenized and mixed coating material on a base material;
s112, cutting the base material into polar bands;
s113, continuously rolling the polar band;
s114, die cutting is carried out on the rolled polar band, tabs are welded, protective glue treatment is carried out on the connection portion of the tabs and the polar band, and a laminated positive electrode material 221 is obtained;
the preparation steps of the laminated negative electrode material 223 are as follows:
s121, blending and homogenizing the negative active material, and then coating the homogenized and mixed coating material on a base material;
s122, cutting the base material into polar bands;
s123, continuously rolling the polar band;
s124, die cutting is carried out on the rolled polar band, tabs are welded, and protective glue treatment is carried out on the connection portion of the tabs and the polar band, so that a negative electrode material laminated negative electrode material 223 is obtained;
the preparation steps of the graphene heating film 110 are as follows:
s131, carrying out ingredient homogenization on the graphene electric heating material, and then coating the homogenized and mixed coating material on a base material;
s132, printing a silver paste conductive tape on the base material to obtain a semi-finished product heating film;
s133, slicing the semi-finished heating film;
and S134, welding a power supply line to the sliced semi-finished heating film, and performing insulation packaging to obtain the graphene heating film 110.
It is noted that, herein, relational terms such as first and second, and the like may be 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a self-heating electric core battery, includes shell, electric core and closing cap, and shell and inside one that forms of closing cap cooperation are used for placing electric core's seal chamber, its characterized in that still includes:
the graphene heating film (110) wraps the electric core inner core, and the graphene heating film (110) generates heat after being electrified and is used for heating the electric core inner core.
2. The self-heating cell battery of claim 1, wherein: graphene heating film (110) includes substrate, first power supply line (111), second power supply line (112), conduction band (113) and graphite alkene heating material (114), the material (114) that generates heat is coated to the graphite alkene on the substrate, substrate printed conduction band (113), first power supply line (111) and second power supply line (112) all with conduction band (113) are connected.
3. The self-heating cell battery of claim 1, wherein: the cell core is one of a cell coil (120) and a sheet-shaped cell (220).
4. The self-heating cell battery of claim 3, wherein: the battery cell coil (120) comprises a positive electrode material (121), a diaphragm (122) and a negative electrode material (123), the positive electrode material (121), the diaphragm (122), the negative electrode material (123) and the diaphragm (122) are sequentially overlapped and wound into a vortex shape, the battery cell coil (120) is arranged in a first battery cell shell (100), the first battery cell shell (100) is connected with a first sealing cover (130), and a first electrolyte tank (124) is formed by gaps among the first battery cell shell (100), the positive electrode material (121), the diaphragm (122) and the negative electrode material (123);
the first sealing cover (130) comprises a first wire hole (131), a second wire hole (134) and an anode (133), the first sealing cover (130) is provided with the first wire hole (131) and the second wire hole (134) for a first power supply wire (111) and a second power supply wire (112) to penetrate out of the first sealing cover (130) and extend to the outside, a safety valve (132) is arranged in the middle of the first sealing cover (130), and the upper surface of the first sealing cover (130) is provided with the raised anode (133);
the positive electrode material (121) is connected with a positive electrode lug, and the positive electrode lug is welded with a metal piece connected with a positive electrode (133); the negative electrode material (123) is connected with a negative electrode tab, and the negative electrode tab is welded with the negative electrode (102).
5. The self-heating cell battery of claim 4, wherein: a shell neck groove (101) is formed in the end portion, close to the opening of the first battery cell shell (100), and a neck ring is formed inwards in the shell neck groove (101) and used for supporting the first sealing cover (130).
6. The self-heating cell battery of claim 4, wherein: the negative electrode material (123) is 0.5-1.5 mm wider than the positive electrode material (121); the negative electrode material (123) is 5-10 mm longer than the positive electrode material (121);
the separator (122) is 0.5 to 1.0mm wider than the negative electrode material (123), and the separator (122) is 1 to 2.0mm longer than the negative electrode material (123).
7. The self-heating cell battery of claim 4, wherein: the length dimension of the graphene heating film (110) is 3-10 mm smaller than the perimeter dimension of the battery cell coil (120); the width dimension of the graphene heating film (110) is 0.5-2.0 mm smaller than the height dimension of the battery cell coil (120).
8. The self-heating cell battery of claim 3, wherein: the laminated battery cell (220) comprises a laminated positive electrode material (221), a laminated diaphragm (222), a laminated negative electrode material (223) and a second electrolyte tank (224), wherein the laminated diaphragm (222), the laminated positive electrode material (221), the laminated diaphragm (222) and the laminated negative electrode material (223) are sequentially stacked, an electrode cover (225) is arranged at the upper part of the laminated battery cell (220) and used for connecting the head end of the laminated positive electrode material (221) to a laminated positive electrode (231) and connecting the tail end of the laminated negative electrode material (223) to a laminated negative electrode (232), the laminated positive electrode material (221) and the laminated negative electrode material (223) are sequentially connected in series, the laminated battery cell (220) is arranged in a second battery cell shell (200), and the second battery cell shell (200) is connected with a second sealing cover (230);
the second sealing cover (230) comprises a third wire hole (234), a fourth wire hole (235) and a liquid injection hole (233), the third wire hole (234) and the fourth wire hole (235) are arranged on the second sealing cover (230) and used for enabling a first power supply wire (111) and a second power supply wire (112) to penetrate out of the second sealing cover (230) and extend to the outside, and the second sealing cover (230) is provided with the liquid injection hole (233).
9. A method of making the cell battery of claim 3, wherein: the method comprises the following steps: sequentially overlapping the positive electrode material (121), the diaphragm (122), the negative electrode material (123) and the diaphragm (122), winding, and sealing edges to obtain a battery core roll (120);
wrapping the cell coil (120) with a graphene heating film (110), and fixing the graphene heating film (110) to obtain a graphene cell coil;
placing the graphene battery cell coil into a first battery cell shell (100), and performing short-circuit inspection after spot welding of a negative electrode (102);
baking a first cell shell (100) filled with a graphene cell coil, and injecting an electrolyte into the first cell shell (100);
leading the first power supply line (111) and the second power supply line (112) to pass through the first line hole (131) and the second line hole (134) on the first cover (130), and then spot-welding the positive electrode (133);
insulating and sealing the first wire hole (131) and the second wire hole (134), and performing gland sealing treatment to obtain a semi-finished product of the self-heating battery cell;
cleaning, drying and storing the self-heating battery cell semi-finished product, and detecting the alignment degree of the self-heating battery cell semi-finished product;
carrying out shell body code spraying, formation, OCV (open circuit control) testing and capacity grading on the qualified semi-finished product of the self-heating battery cell to obtain a finished product of the self-heating battery cell;
and (4) performing appearance full inspection on the self-heating battery cell finished product, spraying grade codes, scanning grades, packaging and warehousing.
10. A method of making the cell battery of claim 8, wherein: sequentially stacking the laminated diaphragm (222), the laminated positive electrode material (221), the laminated diaphragm (222) and the laminated negative electrode material (223), and carrying out flat pressing to obtain a pretreated product;
welding a tab on the pretreated product, and performing edge sealing and rubberizing treatment to obtain a sheet-shaped battery cell (220);
wrapping the sheet-shaped battery cell (220) with a graphene heating film (110), and fixing the graphene heating film (110) to obtain the graphene sheet-shaped battery cell;
placing the graphene sheet-like cell into a second cell housing (200);
leading the first power supply line (111) and the second power supply line (112) to pass through a third line hole (234) and a fourth line hole (235) on the second cover (230);
insulating and sealing the first wire hole (131) and the second wire hole (134), and sealing by a gland to obtain an intermediate product;
injecting electrolyte into the intermediate product through the injection hole (233);
pre-melting, pumping, sealing and injecting the liquid hole to obtain a semi-finished product of the self-heating battery cell;
carrying out formation, capacity grading and OCV (oil control valve) test on the self-heating battery cell semi-finished product to obtain a self-heating battery cell finished product;
and (4) carrying out appearance full inspection, packaging and warehousing on the self-heating battery cell finished product.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110520088.XA CN113113673A (en) | 2021-05-13 | 2021-05-13 | Self-heating battery cell and preparation method thereof |
| PCT/CN2022/084472 WO2022237378A1 (en) | 2021-05-13 | 2022-03-31 | Self-heating battery and preparation method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110520088.XA CN113113673A (en) | 2021-05-13 | 2021-05-13 | Self-heating battery cell and preparation method thereof |
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| CN113113673A true CN113113673A (en) | 2021-07-13 |
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| CN202110520088.XA Pending CN113113673A (en) | 2021-05-13 | 2021-05-13 | Self-heating battery cell and preparation method thereof |
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| CN (1) | CN113113673A (en) |
| WO (1) | WO2022237378A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594551A (en) * | 2021-07-20 | 2021-11-02 | 山西中泽聚能新能源有限公司 | Preparation method of low-temperature-resistant lithium ion battery |
| WO2022237378A1 (en) * | 2021-05-13 | 2022-11-17 | 江西省新华仁科技有限公司 | Self-heating battery and preparation method therefor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205882128U (en) * | 2016-06-16 | 2017-01-11 | 深圳市比克动力电池有限公司 | Electricity core heating module |
| JP2018190621A (en) * | 2017-05-09 | 2018-11-29 | 三菱製紙株式会社 | Heating sheet for battery heating |
| CN109830754A (en) * | 2018-12-24 | 2019-05-31 | 北京旭江科技有限公司 | A kind of self-heating battery and preparation method thereof based on carbon nano-tube film |
| CN110492201A (en) * | 2019-08-30 | 2019-11-22 | 长沙优力电驱动系统有限公司 | Electric car and its power battery |
| CN111628248B (en) * | 2020-05-26 | 2021-08-24 | 湖南烯源新材科技有限公司 | Power battery self-temperature-limiting graphene heating film assembly and preparation method of heating film thereof |
| CN113113673A (en) * | 2021-05-13 | 2021-07-13 | 江西省新华仁科技有限公司 | Self-heating battery cell and preparation method thereof |
-
2021
- 2021-05-13 CN CN202110520088.XA patent/CN113113673A/en active Pending
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022237378A1 (en) * | 2021-05-13 | 2022-11-17 | 江西省新华仁科技有限公司 | Self-heating battery and preparation method therefor |
| CN113594551A (en) * | 2021-07-20 | 2021-11-02 | 山西中泽聚能新能源有限公司 | Preparation method of low-temperature-resistant lithium ion battery |
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| WO2022237378A1 (en) | 2022-11-17 |
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