CN112448014A - Ultralow-temperature high-capacity secondary lithium battery and preparation method thereof - Google Patents
Ultralow-temperature high-capacity secondary lithium battery and preparation method thereof Download PDFInfo
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- CN112448014A CN112448014A CN202011408358.XA CN202011408358A CN112448014A CN 112448014 A CN112448014 A CN 112448014A CN 202011408358 A CN202011408358 A CN 202011408358A CN 112448014 A CN112448014 A CN 112448014A
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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
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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
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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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- 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
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Abstract
The invention discloses an ultra-low temperature high-capacity secondary lithium battery and a preparation method thereof, wherein the secondary lithium battery mainly comprises a dry battery core, electrolyte and a battery shell, and is prepared by putting the dry battery core into the battery shell, injecting the electrolyte, opening, forming, sealing and grading; the dry battery cell is formed by combining a plurality of unit sub-battery cells together, and the combination mode is as follows: the heat generated during the working of the battery is maximally stored in the battery, the temperature of the battery during the working is improved in an internal circulation mode by the heat, and the activity of lithium ions in the battery is excited by the improvement of the temperature of the battery, so that the working voltage, the current, the charge-discharge capacity retention rate and other electrical properties of the battery in an environment below 50 ℃ below zero are improved. The battery has simple structure and low cost, and is very suitable for the application of electric equipment in various fields in severe cold regions.
Description
Technical Field
The invention relates to the technical field of secondary lithium batteries, in particular to an ultralow-temperature high-capacity secondary lithium battery and a preparation method thereof.
Background
The secondary lithium battery has been widely used in the market due to its advantages of long cycle life, no memory effect, low self-discharge rate, safety, reliability, environmental friendliness, etc. When the material is used in a severe cold region environment below-50 ℃, the working voltage and the current are low, and the charge-discharge capacity retention rate is difficult to improve.
In order to solve the problem, battery enterprises need to realize the improvement of the operating voltage, the current and the charge-discharge capacity retention ratio in the ultralow temperature environment through the improvement and the upgrade of battery materials and the optimization of a battery preparation process so as to meet the requirements of special fields.
Disclosure of Invention
An object of the present invention is to provide an ultra-low temperature high capacity secondary lithium battery and a method of manufacturing the same, which solves one or more of the above-mentioned problems of the prior art.
In order to solve the technical problems, the invention provides an ultralow-temperature high-capacity secondary lithium battery, which comprises a dry battery core, electrolyte and a battery shell, wherein the secondary lithium battery is prepared by putting the dry battery core into the battery shell, injecting the electrolyte, opening the battery shell for formation, sealing and grading, and has the innovation points that: the dry cell is formed by combining a plurality of unit sub-cells together, each unit sub-cell is formed by sequentially and repeatedly laminating a positive plate, a diaphragm, a negative plate and the diaphragm or winding the positive plate, the diaphragm, the negative plate and the diaphragm after the lamination, and the plurality of unit sub-cells maximally store heat generated by the secondary lithium battery during working in a holding heating mode in the secondary lithium battery;
the positive plate is made of a positive material, a conductive agent, a binder and a current collector aluminum foil or aluminum mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and flaking, wherein the positive material is any one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese manganate, lithium nickel cobalt aluminate and lithium nickel manganese aluminate;
the negative plate is made from a negative material, a conductive agent, a binder and a current collector copper foil or copper mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and tabletting, wherein the negative material is one or the combination of more than two of mesocarbon microbeads, artificial graphite, lithium titanate and silicon-carbon negative electrodes;
the diaphragm is made of polypropylene or/and polyethylene as main material through the production processes of stirring, mixing, cooling, extending, drawing out, drying and cutting.
The electrolyte is prepared by mixing lithium salt, carbonic ester and/or carboxylic ester organic solvent; the lithium salt is: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium trifluoromethylsulfonyl imide, lithium trifluoromethylsulfonate; the carbonic ester is as follows: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, vinylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; the carboxylic ester is: methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, gamma-butyrolactone, delta-valerolactone;
the battery shell is square or cylindrical and is made of steel, aluminum or aluminum plastic;
further, the conductive agent is one or a combination of more than two of superconducting carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene; the binder is one or the combination of more than two of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethyl cellulose.
Furthermore, a plurality of the unit sub-cells are mutually connected in parallel to form a dry cell.
Furthermore, a plurality of the unit sub-cells are mutually connected in series to form a dry cell.
Furthermore, a plurality of the unit sub-cells are mutually connected in series to form a single-group sub-cell, and a plurality of the single-group sub-cells are mutually connected in parallel to form a dry cell.
Furthermore, a plurality of the unit sub-cells are mutually connected in parallel to form a single-group sub-cell, and a plurality of the single-group sub-cells are mutually connected in series to form a dry cell.
The invention provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or stacked and then wound, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, and the stacked or wound outer surfaces of the sub-cell positive/negative electrode sub-tab in the directions and the opposite directions are wrapped by the diaphragms to obtain a unit sub-cell;
B. dry cell fabrication
A plurality of unit sub-battery cores are connected in parallel by metal sheets, and the parallel connection process is as follows: welding and connecting the positive electrode sub-tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry cell positive electrode full tab; welding and connecting the negative electrode sub-tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry cell negative electrode full tab; the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry battery cell;
C. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
The invention provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. dry cell fabrication
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: the negative electrode branch lug of the first unit sub-cell is welded and connected with the positive electrode branch lug of the second unit sub-cell by a metal sheet, the negative electrode branch lug of the second unit sub-cell is welded and connected with the positive electrode branch lug of the third unit sub-cell by a metal sheet, the negative electrode branch lug of the third unit sub-cell is welded and connected with the positive electrode branch lug of the fourth unit sub-cell by a metal sheet, after all the unit sub-cells are connected in series in this way, the positive electrode branch lug of the first unit sub-cell forms a dry cell positive electrode full lug, the negative electrode branch lug of the last unit sub-cell forms a dry cell negative electrode full lug, and the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry cell;
C. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
The invention provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. single-component battery core preparation
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: after all the unit sub-electric cores are connected in series in this way, the positive electrode branch lug of the first unit sub-electric core forms a single-unit electric core positive electrode branch lug, and the negative electrode branch lug of the last unit sub-electric core forms a single-unit electric core negative electrode branch lug to obtain a single-unit electric core;
C. dry cell fabrication
A plurality of single-group sub-battery cores are connected in parallel by metal sheets, the number of the unit sub-battery cores of each single-group sub-battery core is the same, and the parallel connection process is as follows: welding and connecting positive pole support tabs of all the single-group battery cells together by using a metal sheet, wherein a reserved part at the tail end of the metal sheet forms a dry battery cell positive pole full tab; welding and connecting the negative pole support tabs of all the single-group battery cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry battery cell negative pole full tab; the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry battery cell;
D. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
The invention provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, reserved tabs of an aluminum foil or an aluminum net of each positive plate are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, reserved tabs of a copper foil or a copper net of each negative plate are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, and a unit sub-cell is obtained;
B. single-component battery core preparation
A plurality of unit sub-battery cores are connected in parallel by metal sheets, and the parallel connection process is as follows: welding and connecting the positive electrode branch tabs of all the unit sub-battery cores together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a positive electrode branch tab of a single-unit sub-battery core; welding and connecting the negative electrode branch tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a single-unit cell negative electrode branch tab to obtain a naked single-unit cell; wrapping the outer surfaces of the bare single-group battery cell except for the positive/negative pole branch lugs by using a polyethylene/propylene film, exposing the positive/negative pole branch lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the directions of the positive/negative pole branch lugs and in the opposite directions to obtain a single-group battery cell;
C. dry cell fabrication
A plurality of single-group sub-battery cores are connected in series by metal sheets, the number of the unit sub-battery cores of each single-group sub-battery core is the same, and the series connection process is as follows: after all the single-unit battery cells are connected in series in this way, the positive pole support tab of the first single-unit battery cell forms a dry battery cell positive pole full tab, the negative pole support tab of the last single-unit battery cell forms a dry battery cell negative pole full tab, and the positive pole full tab and the negative pole full tab are respectively used for connecting external current collectors to obtain a dry battery cell;
D. battery assembly
And putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
Has the advantages that:
the secondary lithium battery is manufactured by preferably combining a plurality of unit sub-battery cores in parallel, series, parallel after series and parallel after series, all the unit sub-battery cores maximally store heat generated during the operation of the battery in a cluster heating mode in the battery, the range value of the heat stored in the secondary lithium battery is 50% -80%, the temperature of the battery during the operation is increased in a heat inner circulation mode, and the activity of lithium ions in the battery is stimulated by the increase of the temperature of the battery, so that the operating voltage, the current and the charge-discharge capacity conservation rate of the battery in an ultralow temperature environment are increased.
Drawings
FIG. 1 shows the discharge capacity retention ratio of one-50 deg.C/1C, -60 deg.C/1C versus 25 deg.C/1C
FIG. 2 shows discharge capacity retention rates at two-50 deg.C/1C, 60 deg.C/1C and 25 deg.C/1C
FIG. 3 shows the discharge capacity retention rates at three-50 deg.C/1C, 60 deg.C/1C and 25 deg.C/1C
FIG. 4 shows the discharge capacity retention rates at four-50 deg.C/1C, 60 deg.C/1C and 25 deg.C/1C
Detailed Description
The first embodiment is as follows:
the lithium secondary battery prepared in the embodiment of fig. 1 has a discharge capacity retention rate of-50 ℃/1C and-60 ℃/1C relative to 25 ℃/1C, and comprises a dry battery core, an electrolyte and a battery case, and is prepared by putting the dry battery core into the battery case, injecting the electrolyte, opening, forming, sealing and grading, and the lithium secondary battery has the innovation points that: the dry cell is formed by combining a plurality of unit sub-cells together, each unit sub-cell is formed by sequentially and repeatedly laminating a positive plate, a diaphragm, a negative plate and the diaphragm or winding the positive plate, the diaphragm, the negative plate and the diaphragm after the lamination, and the plurality of unit sub-cells maximally store heat generated by the secondary lithium battery during working in a holding heating mode in the secondary lithium battery;
the positive plate is made of a positive material, a conductive agent, a binder and a current collector aluminum foil or aluminum mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and flaking, wherein the positive material is any one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese manganate, lithium nickel cobalt aluminate and lithium nickel manganese aluminate;
the negative plate is made from a negative material, a conductive agent, a binder and a current collector copper foil or copper mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and tabletting, wherein the negative material is one or the combination of more than two of mesocarbon microbeads, artificial graphite, lithium titanate and silicon-carbon negative electrodes;
the diaphragm is made of polypropylene or/and polyethylene as main material through the production processes of stirring, mixing, cooling, extending, drawing out, drying and cutting.
The electrolyte is prepared by mixing lithium salt, carbonic ester and/or carboxylic ester organic solvent; the lithium salt is: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium trifluoromethylsulfonyl imide, lithium trifluoromethylsulfonate; the carbonic ester is as follows: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, vinylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; the carboxylic ester is: methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, gamma-butyrolactone, delta-valerolactone;
the battery shell is square or cylindrical and is made of steel, aluminum or aluminum plastic;
in this embodiment, the conductive agent is one or a combination of two or more of superconducting carbon black, conductive graphite, carbon fiber, carbon nanotube, and graphene; the binder is one or the combination of more than two of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethyl cellulose.
In this embodiment, a plurality of the unit sub-cells are connected in parallel to form a dry cell.
The embodiment provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. dry cell fabrication
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: the negative electrode branch lug of the first unit sub-cell is welded and connected with the positive electrode branch lug of the second unit sub-cell by a metal sheet, the negative electrode branch lug of the second unit sub-cell is welded and connected with the positive electrode branch lug of the third unit sub-cell by a metal sheet, the negative electrode branch lug of the third unit sub-cell is welded and connected with the positive electrode branch lug of the fourth unit sub-cell by a metal sheet, after all the unit sub-cells are connected in series in this way, the positive electrode branch lug of the first unit sub-cell forms a dry cell positive electrode full lug, the negative electrode branch lug of the last unit sub-cell forms a dry cell negative electrode full lug, and the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry cell;
C. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
In the embodiment, the tabs are preferably welded and connected together in parallel by tab welding components of the pole pieces, so that the contact area between the tabs and the tabs is effectively increased, the internal resistance of the battery is reduced, and the conductivity of the battery is improved, thereby improving the operating voltage, current and charge-discharge capacity retention rate of the battery in an ultralow temperature environment.
Example 2
As shown in fig. 2, the lithium secondary battery prepared in this embodiment has a discharge capacity retention ratio of-50 ℃/1C, -60 ℃/1C relative to 25 ℃/1C, and includes a dry battery cell, an electrolyte and a battery case, and is manufactured by placing the dry battery cell into the battery case, injecting the electrolyte, opening, forming, sealing and grading, and has the innovation points that: the dry cell is formed by combining a plurality of unit sub-cells together, each unit sub-cell is formed by sequentially and repeatedly laminating a positive plate, a diaphragm, a negative plate and the diaphragm or winding the positive plate, the diaphragm, the negative plate and the diaphragm after the lamination, and the plurality of unit sub-cells maximally store heat generated by the secondary lithium battery during working in a holding heating mode in the secondary lithium battery;
the positive plate is made of a positive material, a conductive agent, a binder and a current collector aluminum foil or aluminum mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and flaking, wherein the positive material is any one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese manganate, lithium nickel cobalt aluminate and lithium nickel manganese aluminate;
the negative plate is made from a negative material, a conductive agent, a binder and a current collector copper foil or copper mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and tabletting, wherein the negative material is one or the combination of more than two of mesocarbon microbeads, artificial graphite, lithium titanate and silicon-carbon negative electrodes;
the diaphragm is made of polypropylene or/and polyethylene as main material through the production processes of stirring, mixing, cooling, extending, drawing out, drying and cutting.
The electrolyte is prepared by mixing lithium salt, carbonic ester and/or carboxylic ester organic solvent; the lithium salt is: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium trifluoromethylsulfonyl imide, lithium trifluoromethylsulfonate; the carbonic ester is as follows: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, vinylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; the carboxylic ester is: methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, gamma-butyrolactone, delta-valerolactone;
the battery shell is square or cylindrical and is made of steel, aluminum or aluminum plastic;
in this embodiment, the conductive agent is one or a combination of two or more of superconducting carbon black, conductive graphite, carbon fiber, carbon nanotube, and graphene; the binder is one or the combination of more than two of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethyl cellulose.
In this embodiment, several unit sub-cells are connected in series to form a dry cell.
The embodiment provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. dry cell fabrication
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: the negative electrode branch lug of the first unit sub-cell is welded and connected with the positive electrode branch lug of the second unit sub-cell by a metal sheet, the negative electrode branch lug of the second unit sub-cell is welded and connected with the positive electrode branch lug of the third unit sub-cell by a metal sheet, the negative electrode branch lug of the third unit sub-cell is welded and connected with the positive electrode branch lug of the fourth unit sub-cell by a metal sheet, after all the unit sub-cells are connected in series in this way, the positive electrode branch lug of the first unit sub-cell forms a dry cell positive electrode full lug, the negative electrode branch lug of the last unit sub-cell forms a dry cell negative electrode full lug, and the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry cell;
C. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
In the embodiment, the tabs are preferably welded and connected together in series by tab welding components of the pole pieces, so that the contact area between the tabs and the tabs is effectively increased, the internal resistance of the battery is reduced, and the conductivity of the battery is improved, thereby improving the operating voltage, current and charge-discharge capacity retention rate of the battery in an ultralow temperature environment.
Example 3
As shown in fig. 3, the lithium secondary battery prepared in this embodiment has a discharge capacity retention ratio of-50 ℃/1C, -60 ℃/1C relative to 25 ℃/1C, and includes a dry battery cell, an electrolyte and a battery case, and is manufactured by placing the dry battery cell into the battery case, injecting the electrolyte, opening, forming, sealing and grading, and has the innovation points that: the dry cell is formed by combining a plurality of unit sub-cells together, each unit sub-cell is formed by sequentially and repeatedly laminating a positive plate, a diaphragm, a negative plate and the diaphragm or winding the positive plate, the diaphragm, the negative plate and the diaphragm after the lamination, and the plurality of unit sub-cells maximally store heat generated by the secondary lithium battery during working in a holding heating mode in the secondary lithium battery;
the positive plate is made of a positive material, a conductive agent, a binder and a current collector aluminum foil or aluminum mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and flaking, wherein the positive material is any one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese manganate, lithium nickel cobalt aluminate and lithium nickel manganese aluminate;
the negative plate is made from a negative material, a conductive agent, a binder and a current collector copper foil or copper mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and tabletting, wherein the negative material is one or the combination of more than two of mesocarbon microbeads, artificial graphite, lithium titanate and silicon-carbon negative electrodes;
the diaphragm is made of polypropylene or/and polyethylene as main material through the production processes of stirring, mixing, cooling, extending, drawing out, drying and cutting.
The electrolyte is prepared by mixing lithium salt, carbonic ester and/or carboxylic ester organic solvent; the lithium salt is: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium trifluoromethylsulfonyl imide, lithium trifluoromethylsulfonate; the carbonic ester is as follows: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, vinylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; the carboxylic ester is: methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, gamma-butyrolactone, delta-valerolactone;
the battery shell is square or cylindrical and is made of steel, aluminum or aluminum plastic;
in this embodiment, the conductive agent is one or a combination of two or more of superconducting carbon black, conductive graphite, carbon fiber, carbon nanotube, and graphene; the binder is one or the combination of more than two of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethyl cellulose.
In this embodiment, a plurality of the unit sub-cells are connected in series to form a single unit sub-cell, and a plurality of the single unit sub-cells are connected in parallel to form a dry cell.
The embodiment provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. single-component battery core preparation
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: after all the unit sub-electric cores are connected in series in this way, the positive electrode branch lug of the first unit sub-electric core forms a single-unit electric core positive electrode branch lug, and the negative electrode branch lug of the last unit sub-electric core forms a single-unit electric core negative electrode branch lug to obtain a single-unit electric core;
C. dry cell fabrication
A plurality of single-group sub-battery cores are connected in parallel by metal sheets, the number of the unit sub-battery cores of each single-group sub-battery core is the same, and the parallel connection process is as follows: welding and connecting positive pole support tabs of all the single-group battery cells together by using a metal sheet, wherein a reserved part at the tail end of the metal sheet forms a dry battery cell positive pole full tab; welding and connecting the negative pole support tabs of all the single-group battery cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry battery cell negative pole full tab; the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry battery cell;
D. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
In the embodiment, the tabs are preferably welded and connected in series through tab welding components of the pole pieces, and the tabs of the single-component battery cell are welded and connected in parallel, so that the contact area between the tabs and the tabs is effectively increased, the internal resistance of the battery is reduced, the conductivity of the battery is improved, and the operating voltage, the current and the charge-discharge capacity retention rate of the battery in an ultralow-temperature environment are improved.
Example 4
As shown in fig. 4, the lithium secondary battery prepared in this embodiment has a discharge capacity retention ratio of-50 ℃/1C, -60 ℃/1C relative to 25 ℃/1C, and includes a dry battery cell, an electrolyte and a battery case, and is manufactured by placing the dry battery cell into the battery case, injecting the electrolyte, opening, forming, sealing and grading, and has the innovation points that: the dry cell is formed by combining a plurality of unit sub-cells together, each unit sub-cell is formed by sequentially and repeatedly laminating a positive plate, a diaphragm, a negative plate and the diaphragm or winding the positive plate, the diaphragm, the negative plate and the diaphragm after the lamination, and the plurality of unit sub-cells maximally store heat generated by the secondary lithium battery during working in a holding heating mode in the secondary lithium battery;
the positive plate is made of a positive material, a conductive agent, a binder and a current collector aluminum foil or aluminum mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and flaking, wherein the positive material is any one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese manganate, lithium nickel cobalt aluminate and lithium nickel manganese aluminate;
the negative plate is made from a negative material, a conductive agent, a binder and a current collector copper foil or copper mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and tabletting, wherein the negative material is one or the combination of more than two of mesocarbon microbeads, artificial graphite, lithium titanate and silicon-carbon negative electrodes;
the diaphragm is made of polypropylene or/and polyethylene as main material through the production processes of stirring, mixing, cooling, extending, drawing out, drying and cutting.
The electrolyte is prepared by mixing lithium salt, carbonic ester and/or carboxylic ester organic solvent; the lithium salt is: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium trifluoromethylsulfonyl imide, lithium trifluoromethylsulfonate; the carbonic ester is as follows: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, vinylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; the carboxylic ester is: methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, gamma-butyrolactone, delta-valerolactone;
the battery shell is square or cylindrical and is made of steel, aluminum or aluminum plastic;
in this embodiment, the conductive agent is one or a combination of two or more of superconducting carbon black, conductive graphite, carbon fiber, carbon nanotube, and graphene; the binder is one or the combination of more than two of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethyl cellulose.
In this embodiment, a plurality of the unit sub-cells are connected in parallel to form a single unit sub-cell, and a plurality of the single unit sub-cells are connected in series to form a dry cell
The embodiment provides a preparation method of an ultralow-temperature high-capacity secondary lithium battery, which specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, reserved tabs of an aluminum foil or an aluminum net of each positive plate are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, reserved tabs of a copper foil or a copper net of each negative plate are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, and a unit sub-cell is obtained;
B. single-component battery core preparation
A plurality of unit sub-battery cores are connected in parallel by metal sheets, and the parallel connection process is as follows: welding and connecting the positive electrode branch tabs of all the unit sub-battery cores together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a positive electrode branch tab of a single-unit sub-battery core; welding and connecting the negative electrode branch tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a single-unit cell negative electrode branch tab to obtain a naked single-unit cell; wrapping the outer surfaces of the bare single-group battery cell except for the positive/negative pole branch lugs by using a polyethylene/propylene film, exposing the positive/negative pole branch lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the directions of the positive/negative pole branch lugs and in the opposite directions to obtain a single-group battery cell;
C. dry cell fabrication
A plurality of single-group sub-battery cores are connected in series by metal sheets, the number of the unit sub-battery cores of each single-group sub-battery core is the same, and the series connection process is as follows: after all the single-unit battery cells are connected in series in this way, the positive pole support tab of the first single-unit battery cell forms a dry battery cell positive pole full tab, the negative pole support tab of the last single-unit battery cell forms a dry battery cell negative pole full tab, and the positive pole full tab and the negative pole full tab are respectively used for connecting external current collectors to obtain a dry battery cell;
D. battery assembly
And putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
In the embodiment, the tabs are preferably welded and connected in parallel through tab welding components of the pole pieces, and the tabs of the single-component battery cell are welded and connected in series, so that the contact area between the tabs and the tabs is effectively increased, the internal resistance of the battery is reduced, the conductivity of the battery is improved, and the operating voltage, the current and the charge-discharge capacity retention rate of the battery in an ultralow-temperature environment are improved.
In conclusion, the discharge capacity retention rate of the lithium secondary battery with ultralow temperature and high capacity prepared by the invention at-50 ℃/1C, -60 ℃/1C relative to 25 ℃/1C is more than 95%.
The above description is only intended to represent a few embodiments of the present invention, and the description is in detail, but not to be construed as limiting the scope of the present invention. It should be noted that it is apparent to those skilled in the art that several variations and modifications can be made to the ultra-low temperature high capacity secondary lithium battery without departing from the spirit of the present invention, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides an ultra-low temperature high capacity's secondary lithium cell, secondary lithium cell includes dry electric core, electrolyte and battery case, puts into the battery case through dry electric core, pours into electrolyte, opens the formation, seals, partial volume and makes its characterized in that: the dry cell is formed by combining a plurality of unit sub-cells together, the unit sub-cells are formed by sequentially and repeatedly laminating a positive plate, a diaphragm, a negative plate and the diaphragm or winding the laminated positive plate, the diaphragm, the negative plate and the diaphragm, and the plurality of unit sub-cells maximally store heat generated by the secondary lithium battery during working in a holding heating mode in the secondary lithium battery;
the positive plate is made of a positive material, a conductive agent, a binder and a current collector aluminum foil or aluminum mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and flaking, wherein the positive material is any one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese, lithium nickel cobalt aluminate and lithium nickel manganese aluminate;
the negative plate is made of a negative material, a conductive agent, a binder and a current collector copper foil or copper mesh with reserved lugs through the production processes of pulping, coating, baking, rolling and tabletting, wherein the negative material is one or the combination of more than two of mesocarbon microbeads, artificial graphite, lithium titanate and silicon-carbon negative electrodes;
the diaphragm is made of polypropylene or/and polyethylene as main materials by the production processes of stirring, mixing, cooling, extending, drawing, drying and cutting.
The electrolyte is prepared by mixing lithium salt, carbonic ester and/or carboxylic ester organic solvents; the lithium salt is: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium trifluoromethylsulfonyl imide, lithium trifluoromethylsulfonate; the carbonic ester is as follows: ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, vinylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; the carboxylic ester is as follows: methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, gamma-butyrolactone, delta-valerolactone;
the battery shell is square or cylindrical and is made of steel, aluminum or aluminum plastic.
2. An ultra-low temperature high capacity lithium secondary battery as claimed in claim 1, wherein: the conductive agent is one or the combination of more than two of superconductive carbon black, conductive graphite, carbon fiber, carbon nano tube and graphene; the binder is one or the combination of more than two of polyvinylidene fluoride, styrene butadiene rubber and sodium carboxymethyl cellulose.
3. An ultra-low temperature high capacity lithium secondary battery as claimed in claim 2, wherein: and a plurality of the unit sub-cells are mutually connected in parallel to form the dry cell.
4. An ultra-low temperature high capacity lithium secondary battery as claimed in claim 2, wherein: and a plurality of the unit sub-cells are mutually connected in series to form the dry cell.
5. An ultra-low temperature high capacity lithium secondary battery as claimed in claim 2, wherein: the unit sub-cells are mutually connected in series to form a single-group sub-cell, and the single-group sub-cells are mutually connected in parallel to form the dry cell.
6. An ultra-low temperature high capacity lithium secondary battery as claimed in claim 2, wherein: the unit sub-cells are mutually connected in parallel to form a single-group sub-cell, and the single-group sub-cells are mutually connected in series to form the dry cell.
7. A method of manufacturing an ultra-low temperature high capacity secondary lithium battery as claimed in claim 3, characterized in that: the method specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or stacked and then wound, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, and the stacked or wound outer surfaces of the sub-cell positive/negative electrode sub-tab in the directions and the opposite directions are wrapped by the diaphragms to obtain a unit sub-cell;
B. dry cell fabrication
A plurality of unit sub-battery cores are connected in parallel by metal sheets, and the parallel connection process is as follows: welding and connecting the positive electrode sub-tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry cell positive electrode full tab; welding and connecting the negative electrode sub-tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry cell negative electrode full tab; the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry battery cell;
C. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
8. A method of manufacturing an ultra-low temperature high capacity secondary lithium battery as claimed in claim 4, characterized in that: the method specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. dry cell fabrication
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: the negative electrode branch lug of the first unit sub-cell is welded and connected with the positive electrode branch lug of the second unit sub-cell by a metal sheet, the negative electrode branch lug of the second unit sub-cell is welded and connected with the positive electrode branch lug of the third unit sub-cell by a metal sheet, the negative electrode branch lug of the third unit sub-cell is welded and connected with the positive electrode branch lug of the fourth unit sub-cell by a metal sheet, after all the unit sub-cells are connected in series in this way, the positive electrode branch lug of the first unit sub-cell forms a dry cell positive electrode full lug, the negative electrode branch lug of the last unit sub-cell forms a dry cell negative electrode full lug, and the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry cell;
C. battery assembly
And (3) putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
9. A method of manufacturing an ultra-low temperature high capacity secondary lithium battery as claimed in claim 5, characterized in that: the method specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, tabs reserved by aluminum foils or aluminum nets of the positive plates are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, and tabs reserved by copper foils or copper nets of the negative plates are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, so that a naked unit sub-cell is obtained; wrapping the outer surfaces of the naked unit sub-battery cores except for the positive/negative pole separating lugs by using a polyethylene/propylene film, exposing the positive/negative pole separating lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the positive/negative pole separating lug direction and the negative pole separating lug direction to obtain unit sub-battery cores;
B. single-component battery core preparation
A plurality of unit sub-battery cores are connected in series by metal sheets, and the series connection process is as follows: after all the unit sub-electric cores are connected in series in this way, the positive electrode branch lug of the first unit sub-electric core forms a single-unit electric core positive electrode branch lug, and the negative electrode branch lug of the last unit sub-electric core forms a single-unit electric core negative electrode branch lug to obtain a single-unit electric core;
C. dry cell fabrication
A plurality of single-group sub-battery cores are connected in parallel by metal sheets, the number of the unit sub-battery cores of each single-group sub-battery core is the same, and the parallel connection process is as follows: welding and connecting positive pole support tabs of all the single-group battery cells together by using a metal sheet, wherein a reserved part at the tail end of the metal sheet forms a dry battery cell positive pole full tab; welding and connecting the negative pole support tabs of all the single-group battery cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a dry battery cell negative pole full tab; the positive electrode full lug and the negative electrode full lug are respectively used for connecting an external current collector to obtain a dry battery cell;
D. battery assembly
And putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
10. A method of manufacturing an ultra-low temperature high capacity secondary lithium battery as claimed in claim 6, characterized in that: the method specifically comprises the following steps:
A. cell core preparation
The positive plate, the diaphragm, the negative plate and the diaphragm are sequentially and repeatedly stacked or wound after being stacked, reserved tabs of an aluminum foil or an aluminum net of each positive plate are stacked or wound and gathered and then welded together to form a sub-cell positive electrode sub-tab, reserved tabs of a copper foil or a copper net of each negative plate are stacked or wound and gathered and then welded together to form a sub-cell negative electrode sub-tab, and a unit sub-cell is obtained;
B. single-component battery core preparation
A plurality of unit sub-battery cores are connected in parallel by metal sheets, and the parallel connection process is as follows: welding and connecting the positive electrode branch tabs of all the unit sub-battery cores together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a positive electrode branch tab of a single-unit sub-battery core; welding and connecting the negative electrode branch tabs of all the unit sub-cells together by using a metal sheet, wherein the reserved part at the tail end of the metal sheet forms a single-unit cell negative electrode branch tab to obtain a naked single-unit cell; wrapping the outer surfaces of the bare single-group battery cell except for the positive/negative pole branch lugs by using a polyethylene/propylene film, exposing the positive/negative pole branch lugs outside the polyethylene/propylene film, and reserving air holes/seams on the surfaces of the polyethylene/propylene film in the directions of the positive/negative pole branch lugs and in the opposite directions to obtain a single-group battery cell;
C. dry cell fabrication
A plurality of single-group sub-battery cores are connected in series by metal sheets, the number of the unit sub-battery cores of each single-group sub-battery core is the same, and the series connection process is as follows: after all the single-unit battery cells are connected in series in this way, the positive pole support tab of the first single-unit battery cell forms a dry battery cell positive pole full tab, the negative pole support tab of the last single-unit battery cell forms a dry battery cell negative pole full tab, and the positive pole full tab and the negative pole full tab are respectively used for connecting external current collectors to obtain a dry battery cell;
D. battery assembly
And putting the dry battery core into a battery shell, injecting electrolyte, opening to form, sealing and grading to obtain the ultralow-temperature high-capacity secondary lithium battery.
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| CN114203985A (en) * | 2021-11-08 | 2022-03-18 | 风帆有限责任公司 | Lithium ion battery with wide temperature range and preparation method thereof |
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| CN114203985A (en) * | 2021-11-08 | 2022-03-18 | 风帆有限责任公司 | Lithium ion battery with wide temperature range and preparation method thereof |
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