CN114171771B - Laminated power battery and preparation method and application thereof - Google Patents

Laminated power battery and preparation method and application thereof Download PDF

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Publication number
CN114171771B
CN114171771B CN202110421020.6A CN202110421020A CN114171771B CN 114171771 B CN114171771 B CN 114171771B CN 202110421020 A CN202110421020 A CN 202110421020A CN 114171771 B CN114171771 B CN 114171771B
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lamination
positive
negative
pole
laminated
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CN114171771A (en
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彭思侃
燕绍九
王楠
杨明
燕昌童
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Beijing Zhihang Technology Co ltd
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Beijing Zhihang Technology Co ltd
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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/045—Cells or batteries with folded plate-like electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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 discloses a laminated power battery and a preparation method and application thereof. The battery pole core comprises at least one group of laminated pole cores; the laminated pole core includes: the positive electrode comprises a positive electrode lamination, a negative electrode lamination, a diaphragm, a positive electrode current collecting surface and a negative electrode current collecting surface; a diaphragm is arranged between the positive lamination and the negative lamination, so that the positive lamination and the negative lamination are in no electrical contact; the positive current collecting surface is an electric connection plane formed by bending and leveling a bare positive current collector in at least any normal direction of the positive lamination direction; the negative current collecting surface is an electric connection plane formed by bending and leveling a bare negative current collector in at least any normal direction of the negative lamination. The laminated power battery obtained by the scheme of the invention has simple and convenient manufacturing process, greatly simplifies the welding process, avoids insufficient welding, greatly improves the current collecting and overflowing capacity and has good power performance; the battery has flexible shape and structure, and is convenient for modular design and group management.

Description

Laminated power battery and preparation method and application thereof
Technical Field
The invention belongs to the technical field of batteries, and relates to a laminated power battery and a preparation method and application thereof.
Background
With the continuous development of electric propulsion technology, electric automobiles, electric aircrafts, electric tools and the like, people have higher and higher requirements on the structure and performance of a power battery, and the power battery develops towards the direction of high specific power, high specific energy, high safety and diversified appearance structures. In 2020, the requirement of the quick charging performance of the battery reaches more than 3C multiplying power. In order to maximize the utilization of system space, the requirement for flexibility of the shape of the battery and the battery pack is also increasing.
In order to meet the requirements, a multi-tab structure is adopted to reduce the internal resistance of the battery so as to improve the quick charging performance of the battery. However, the electronic transmission between the battery pole piece and the pole lug becomes a speed-limiting link, and the resistance and the heat generation are large, so that the rate capability and the safety performance of the power battery are limited. The existing common battery appearance structure is a cylinder, a square shell and a soft package, and has limitation, so that the increasingly diversified battery space design requirements cannot be met.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a laminated power battery and a battery pack, and aims to provide the laminated power battery, so that the pole core structure of the battery is flexible, and the diversified design of the battery appearance is facilitated; the current collector and the lug structure function integrated structure is designed, the electron transfer path is shortened, the internal resistance of the battery is reduced, and the charge-discharge multiplying power and the safety performance of the battery are improved.
The technical scheme of the invention is as follows:
a battery pole piece comprises at least one group of laminated pole pieces; the laminated pole core includes: the positive electrode comprises a positive electrode lamination, a negative electrode lamination, a diaphragm, a positive electrode current collecting surface and a negative electrode current collecting surface;
a diaphragm is arranged between the positive lamination and the negative lamination, so that the positive lamination and the negative lamination are in no electrical contact;
the positive current collecting surface is an electric connection plane formed by bending and leveling a bare positive current collector in at least any one normal direction of the positive lamination direction;
the anode current collector face is an electric connection plane formed by bending and leveling a bare anode current collector in at least any one normal direction of the anode lamination direction.
According to an embodiment of the present invention, the height of the positive current collecting face is not less than 4% of the length of the positive electrode lamination.
According to an embodiment of the present invention, the height of the anode current collecting face is not less than 4% of the length of the anode lamination.
According to an embodiment of the invention, the heights of the bare positive current collector and the bare negative current collector are the same. Preferably, the height of the bare positive and negative current collectors is denoted as H, and the height of the bare current collector H is 190% to 450% of the laminated core thickness (i.e., the sum of the positive lamination thickness, the negative lamination thickness, and the separator thickness), for example 220% to 430%, and further, for example, 250% to 400%.
When the electrode pole core only contains a group of laminated pole cores, the height of the anode current collecting face is equal to the height H of the exposed anode current collector, and the height of the cathode current collecting face is equal to the height H of the exposed cathode current collector.
According to an embodiment of the present invention, the battery pole core may include one, two, three, four or more sets of laminated pole cores. For example, three, five, ten, twenty-five, fifty, one hundred, or one hundred fifty sets of laminated pole cores are included.
Preferably, when the battery pole core at least comprises two groups of laminated pole cores, the laminated pole cores of each group are arranged in parallel, and a diaphragm is arranged between the adjacent laminated pole cores, so that the positive pole laminations and the negative pole laminations of the adjacent laminated pole cores are not in contact with each other;
preferably, the positive current collecting surfaces in the laminated pole cores are in the same electrical connection plane;
preferably, the anode current collecting faces in the respective laminated pole cores are in the same electrical connection plane.
According to an embodiment of the present invention, the positive electrode stack includes a positive electrode current collector and positive electrode materials on both sides of the positive electrode current collector.
According to an embodiment of the present invention, the negative electrode laminate includes a negative electrode collector and a negative electrode material on both front and back sides of the negative electrode collector.
According to the embodiment of the present invention, the portion of the positive electrode laminate coated with the positive electrode material and the portion of the negative electrode laminate coated with the negative electrode material are the same in shape and size. For example, the plane where both contact the membrane may be of regular or irregular shape, such as quadrilateral (rectangle, square), regular or irregular hexagon, regular or irregular N-polygon (N ≧ 3). Wherein the shape of the bare positive electrode current collector and the bare negative electrode current collector may be the same or different.
According to an embodiment of the present invention, the separator is any one of a porous resin fiber membrane, a solid electrolyte membrane, and a colloidal electrolyte membrane.
According to an embodiment of the present invention, when the battery pole core includes at least two sets of laminated pole cores, the separators in each set of laminated pole cores may form a continuous separator tape.
According to an embodiment of the invention, the separator separates the positive electrode stack from the negative electrode stack.
According to an embodiment of the present invention, the positive electrode current collector is at least one of an aluminum foil, a nickel foam, an aluminum mesh, a stainless steel mesh, and a nickel mesh.
According to an embodiment of the present invention, the negative electrode current collector is at least one of a copper foil, a copper mesh, a nickel foam, a stainless steel mesh, and a nickel mesh.
The invention also provides a preparation method of the laminated pole core, which comprises the following steps: assembling the positive lamination with the exposed positive current collector, the negative lamination with the exposed negative current collector and the diaphragm;
wherein the separator is positioned between the positive lamination and the negative lamination;
the bare positive current collector is bent and leveled in at least any normal direction of the positive lamination direction to form an electric connection plane, namely a positive current collecting surface;
and the exposed negative current collector is bent and leveled to form an electric connection plane, namely a negative current collecting surface, in at least any normal direction of the negative lamination.
According to an embodiment of the present invention, the process for preparing the positive electrode stack with the bare positive electrode current collector comprises: coating or rolling the positive electrode material on the positive electrode current collector on the double surfaces, drying, rolling, slitting and sorting to obtain the positive electrode lamination with the positive electrode current collector exposed in the length direction of the pole piece and the height of H. Preferably, the width of the exposed positive electrode current collector is not less than 50% of the maximum width of the pole piece and not more than 100% of the maximum width of the pole piece.
According to an embodiment of the present invention, the positive electrode material is at least one of lithium iron phosphate positive electrode slurry, nickel cobalt manganese positive electrode slurry, lithium manganate positive electrode slurry, lithium cobaltate positive electrode slurry, manganese dioxide positive electrode paste or slurry, carbon fluoride positive electrode paste or slurry, sulfide positive electrode paste or slurry, and elemental sulfur positive electrode slurry.
According to an embodiment of the present invention, the process for preparing the negative electrode laminate with the bare negative electrode collector comprises: and coating or rolling the negative material on the negative current collector on the double surfaces, and drying, rolling, slitting and sorting to obtain the negative lamination with the negative current collector exposed in the length direction of the pole piece and the height of H. Preferably, the width of the bare negative current collector is not less than 50% of the maximum width of the pole piece and not more than 100% of the maximum width of the pole piece.
According to an embodiment of the present invention, the negative electrode material is at least one of graphite negative electrode slurry, silicon carbon negative electrode slurry, zinc paste, lithium powder or lithium foil, sodium metal.
According to an embodiment of the invention, the separator is a continuous separator strip having a width greater than the width of the positive pole piece.
According to an embodiment of the invention, the positive current collector, the separator, the negative current collector have the meaning as described above.
The invention also provides a preparation method of the battery pole core, which comprises the preparation method of the laminated pole core.
According to an embodiment of the present invention, when the battery pole core comprises at least two sets of laminated pole cores, the preparation method thereof comprises: and at least two groups of laminated pole cores are stacked in parallel to form the crossed arrangement of the positive pole lamination and the negative pole lamination, and a diaphragm is arranged between the positive pole lamination and the negative pole lamination.
According to embodiments of the present invention, the membrane may be a continuous membrane or a non-continuous membrane. Preferably, when the battery pole core comprises at least two sets of laminated pole cores, the separator in each laminated pole core is continuous.
According to an embodiment of the present invention, the method for preparing the electrode core includes the steps of: continuously laminating in a Z shape according to the sequence of the diaphragm-the cathode lamination-the diaphragm-the anode lamination- … … -the diaphragm-the cathode lamination-the diaphragm to prepare at least two groups of lamination pole cores; the positive lamination and the negative lamination are separated by a diaphragm, so that no electric contact exists between the positive lamination and the negative lamination; the positive pole bare current collector and the negative pole bare current collector are sequentially stacked in at least any two normal directions of the lamination direction respectively;
the positive pole bare current collector is sequentially bent towards the direction of the lamination to form electric connection and be leveled into a positive pole current collecting surface;
the negative pole exposes the mass flow body and buckles to the lamination direction in proper order, forms the electricity and connects and the flattening becomes negative pole current collecting face.
The invention also provides a laminated power battery which comprises the battery pole core.
According to the embodiment of the invention, the laminated power battery comprises the battery pole core and the shell used for wrapping the battery pole core.
According to an embodiment of the present invention, the case is at least a pentahedron, of which at least 2 faces are in face-contact electrical connection with the positive current collecting face and the negative current collecting face, respectively. Preferably, the electric connection area formed with the positive current collecting surface is larger than 95% of the maximum projection area of the positive current collecting surface. Preferably, the electrical connection area formed with the anode current collecting face is greater than 95% of the maximum projected area of the anode current collecting face.
The invention also provides a preparation method of the laminated power battery, which comprises the following steps: and placing the battery pole core in a shell.
According to an embodiment of the invention, at least 1 set of lamination pole pieces is accommodated in the housing. Preferably, the sets of laminated pole cores may be connected in series or in parallel.
The invention also provides a power battery pack which comprises at least two groups of laminated power batteries.
According to an embodiment of the invention, at least two groups of said laminated power cells are stacked or combined to form a power cell pack in series or in parallel.
The invention provides an application of the laminated pole core, the laminated power battery and the power battery pack in the field of quick charging.
The invention has the beneficial effects that:
1. the invention adopts a structure integrating the structural functions of the current collector and the pole lug, simplifies the welding process and structure of the traditional pole lug and the pole piece current collector, ensures more uniform current distribution, avoids uneven local heat distribution, and avoids operation risks such as insufficient solder and the like. Meanwhile, the space utilization rate of the pole core is higher, and the weight and the volume energy density of the battery are improved.
2. According to the invention, the width of the exposed positive and negative current collectors is not less than 50% of the maximum width of the pole piece, and the heights of the positive current collecting surface and the negative current collecting surface are not less than 4% of the lengths of the positive lamination and the negative lamination, so that the battery has a large-area current collecting passage, and the large-current conduction capability is ensured.
3. The invention adopts a structure integrating the structure functions of the current collector and the pole ear and adopts a Z-shaped lamination process to prepare the pole core, thereby realizing the confluence of a plurality of small pole pieces through a large-area current collecting surface after the small pole pieces are connected in parallel, obviously reducing the internal resistance of the battery, reducing the heat generation of the battery, increasing the large-current conduction capability in a short time and having higher discharging efficiency under high power. Furthermore, the discharge voltage of the battery is higher than that of the battery with the traditional structure.
4. The battery and the battery pack have flexible structures, wide application ranges of battery shapes and thicknesses, and convenient control and design. The battery can be made into any shape.
5. The battery shell is provided with a plurality of surfaces, wherein at least 2 surfaces are respectively in surface contact and electric connection with the anode current collecting surface and the cathode current collecting surface, and the electric connection areas are respectively larger than 95% of the maximum projection areas of the anode current collecting surface and the cathode current collecting surface. Therefore, the battery shell is in surface contact with the current collecting surface of the pole core to realize current collection and lead-out, so that the contact resistance is greatly reduced, and the large-current charge and discharge capacity of the battery is improved. Meanwhile, the battery monomers can be connected in series and parallel by utilizing the contact of the laminated surfaces of the current collecting surfaces of the shell, so that the battery pack group structure is simplified, and the weight and the volume energy density of a power supply are improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery pole core side view (a) and a slitting pole piece (b) in example 1.
Fig. 2 is a schematic structural view of a 4S battery pack formed by connecting 4 battery pole cores of example 1 in series.
FIG. 3 is a schematic view of the slitting pole piece structure of example 2.
FIG. 4 is a schematic view of the structure of the slitting pole piece of example 3.
FIG. 5 is a schematic view of the structure of the slit pole piece of example 4.
Reference numerals:
1-positive pole lamination, 2-negative pole lamination, 3-diaphragm, 4-positive pole current collecting face, 5-negative pole current collecting face, 6-positive pole current collector, 7-negative pole current collector, 8-casing.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.
Example 1
A battery pole piece constructed as shown in fig. 1, comprising fifteen sets of lamination pole pieces; the laminated pole core includes: the cathode comprises a cathode lamination 1, an anode lamination 2, a diaphragm 3, an anode current collecting surface 4 and an anode current collecting surface 5;
a diaphragm 3 is arranged between the positive electrode lamination 1 and the negative electrode lamination 2, so that the positive electrode lamination 1 and the negative electrode lamination 2 are in no electrical contact;
the positive current collecting surface 4 is an electric connection plane formed by bending and leveling a naked positive current collector in at least any normal direction of the positive lamination direction;
the anode current collecting surface 5 is an electrical connection plane formed by bending and leveling a bare anode current collector in at least any normal direction of the anode lamination direction.
Each group of laminated pole cores are arranged in parallel, and a diaphragm is arranged between the adjacent laminated pole cores, so that the positive pole laminations and the negative pole laminations of the adjacent laminated pole cores are in no electrical contact;
the positive current collecting surfaces in the laminated pole cores are in the same electric connection plane;
the anode current collecting surfaces in the laminated pole cores are in the same electric connection plane.
The positive electrode lamination comprises a positive electrode current collector and positive electrode materials positioned on the positive and negative surfaces of the positive electrode current collector, wherein the positive electrode materials are lithium cobaltate.
The negative lamination comprises a negative current collector and negative materials positioned on the front side and the back side of the negative current collector, wherein the negative materials are silicon carbon.
The positive electrode lamination coating portion and the negative electrode lamination coating portion have the same shape and size, and the plane of the positive electrode lamination coating portion and the negative electrode lamination coating portion contacting the separator is quadrilateral.
The diaphragm is a porous resin fiber membrane strip, and the diaphragms in the laminated pole cores form a continuous diaphragm strip.
The positive current collector is aluminum foil, and the negative current collector is copper foil.
The preparation process of the battery pole core comprises the following steps: coating the lithium cobaltate positive electrode slurry on an aluminum foil on two sides, drying, rolling, slitting and sorting to obtain a positive electrode lamination with the aluminum foil height of 3mm exposed in the length direction of the electrode plate, wherein the width of the exposed aluminum foil is 100mm, the width of the positive electrode plate is 100mm, and the length of the positive electrode lamination is 50 mm;
coating the silicon-carbon negative electrode slurry on copper foils on two sides, drying, rolling, slitting and sorting to obtain a negative electrode lamination with the copper foil height of 3mm exposed in the length direction of a pole piece, wherein the width of the exposed copper foil is 100mm, the width of the negative electrode pole piece is 102mm, and the length of the negative electrode lamination is 50 mm;
the diaphragm is a porous resin fiber membrane continuous membrane belt, and the width of the diaphragm is 103 mm;
the sum of the thickness of the positive electrode lamination, the thickness of the negative electrode lamination and the thickness of the diaphragm is 0.67 mm;
as shown in fig. 1, continuous zigzag lamination was performed in the order of separator-negative electrode lamination-separator-positive electrode lamination- … … -separator-negative electrode lamination-separator, with the number of lamination layers being 30, to obtain a laminated pole core. And the positive electrode lamination and the negative electrode lamination are in non-electrical contact. The bare aluminum foils are sequentially bent towards the direction of the lamination to form electric connection and are leveled into a positive current collecting surface, and the height of the positive current collecting surface is 20.1 mm; the bare copper foil of the negative electrode is bent towards the direction of the lamination in sequence to form electric connection and be leveled into a current collecting surface of the negative electrode, and the height of the current collecting surface of the negative electrode is 20.1 mm.
The shell is a cuboid square box, wherein two symmetrical surfaces are respectively in surface contact and electric connection with the anode current collecting surface and the cathode current collecting surface, and the electric connection areas are respectively 2008mm 2 And 2007mm 2 . The single electric core of the embodiment 1 is obtained by containing 1 group of laminated pole cores in the shell
As shown in fig. 2, the battery pole pieces and the case are assembled and stacked to obtain a battery pack connected in series.
Example 2
As shown in fig. 3, the lithium iron phosphate anode slurry is coated on the aluminum foil on both sides, and is dried, rolled, cut and sorted to obtain an anode lamination with the maximum exposed aluminum foil height of 2mm in the length direction of the pole piece, wherein the width of the exposed aluminum foil is 60mm, the maximum width of the anode pole piece is 120mm, and the maximum length of the anode lamination is 40 mm;
coating the graphite negative electrode slurry on copper foils on two sides, drying, rolling, slitting and sorting to obtain a negative electrode lamination with the copper foil height of 2.2mm exposed in the length direction of a pole piece, wherein the width of the exposed copper foil is 62mm, the maximum width of the negative electrode pole piece is 120.5mm, and the maximum length of the negative electrode lamination is 40 mm;
the diaphragm is a colloidal electrolyte membrane continuous membrane belt, and the width of the diaphragm is 122 mm;
the sum of the thickness of the positive electrode lamination, the thickness of the negative electrode lamination and the thickness of the diaphragm is 0.58 mm;
and (3) continuously laminating in a Z shape according to the sequence of the diaphragm-the cathode lamination-the diaphragm-the anode lamination- … … -the diaphragm-the cathode lamination-the diaphragm, wherein the lamination layer number is 50 (namely 25 groups of lamination pole cores), and obtaining the battery pole core. And the positive electrode lamination and the negative electrode lamination are in non-electrical contact. The bare aluminum foils are sequentially bent towards the direction of the lamination to form electric connection and are leveled into a positive current collecting surface, and the height of the positive current collecting surface is 29 mm; the negative pole naked copper foil is buckled to the lamination direction in proper order, forms the electricity and flattens into negative pole current collector, and negative pole current collector height is 29 mm.
The casing is a cuboid square box, wherein two symmetrical surfaces are respectively in surface contact and electric connection with the anode current collecting surface and the cathode current collecting surface, and the electric connection areas are 1660mm 2 And 1708mm 2 . The shell contains 2 groups of battery pole cores connected in series.
Example 3
As shown in fig. 4, rolling the sulfur anode slurry on an aluminum mesh on both sides, drying, rolling, slitting, and sorting to obtain an anode lamination with a maximum exposed aluminum mesh height of 3.5mm, wherein the single exposed aluminum mesh width is 50mm, the total width is 100mm, the maximum anode plate width is 125mm, and the maximum anode lamination length is 120 mm;
rolling the two sides of a lithium foil on a copper net, drying, rolling, slitting and sorting to obtain a negative electrode lamination with the exposed copper net height of 3.5mm, wherein the single width of the exposed copper net is 50mm, the total width is 100mm, the maximum width of a negative electrode pole piece is 126mm, and the maximum length of the negative electrode lamination is 121 mm;
the diaphragm is a solid electrolyte membrane continuous film belt, and the maximum width is 126 mm;
the sum of the thickness of the positive electrode lamination, the thickness of the negative electrode lamination and the thickness of the diaphragm is 1.8 mm;
and (3) carrying out continuous Z-shaped lamination according to the sequence of the diaphragm-cathode lamination-diaphragm-anode lamination- … … -diaphragm-cathode lamination-diaphragm, wherein the lamination layer number is 10 (namely 5 groups of lamination pole cores), and obtaining the battery pole core. And the positive electrode lamination and the negative electrode lamination are in non-electrical contact. The bare aluminum net is sequentially bent towards the lamination direction to form electric connection and be leveled into a positive current collecting surface, and the height of the positive current collecting surface is 18 mm; the negative pole bare copper mesh is bent towards the lamination direction in sequence to form electric connection and be leveled into a negative pole current collecting face, and the height of the negative pole current collecting face is 18 mm.
The casing is an octahedral box, wherein 4 surfaces of the side surface are respectively in surface contact and electric connection with the positive current collecting surface and the negative current collecting surface, and the positive electrode electric connection area is 1720mm 2 The negative electrode has an electrical connection area of 1720mm 2 . The housing contains 1 group of the battery pole cores, and the single battery cell of the embodiment 3 is obtained.
Example 4
As shown in fig. 5, carbon fluoride anode powder is double-side rolled on a nickel screen, and is dried, rolled, cut and sorted to obtain an anode lamination with the exposed nickel screen height of 3mm in the length direction of a pole piece, wherein the width of the exposed nickel screen is 200mm, the width of the anode pole piece is 200mm, and the length of the anode lamination is 80 mm;
rolling the lithium powder on the copper foil on two sides, drying, rolling, slitting and sorting to obtain a negative electrode lamination with the copper foil height of 3mm exposed in the length direction of a pole piece, wherein the width of the exposed copper foil is 202mm, the width of the negative electrode pole piece is 202mm, and the length of the negative electrode lamination is 80 mm;
the diaphragm is a porous resin fiber film continuous film belt, and the maximum width is 202 mm;
the sum of the thickness of the positive electrode lamination, the thickness of the negative electrode lamination and the thickness of the diaphragm is 0.7 mm;
and (3) continuously laminating in a Z shape according to the sequence of the diaphragm-the cathode lamination-the diaphragm-the anode lamination- … … -the diaphragm-the cathode lamination-the diaphragm, wherein the lamination layer number is 20 (namely 10 groups of lamination pole cores), and obtaining the battery pole core. And the positive electrode lamination and the negative electrode lamination are in non-electrical contact. The bare aluminum-nickel net is sequentially bent towards the lamination direction to form electric connection and be leveled into a positive current collecting surface, and the height of the positive current collecting surface is 14 mm; the negative pole naked copper foil is buckled to the lamination direction in proper order, forms the electricity and flattens into the negative pole current collector, and negative pole current collector height is 14 mm.
The shell is an octahedral box, wherein two symmetrical surfaces are respectively in surface contact and electric connection with the anode current collecting surface and the cathode current collecting surface, and the electric connection areas are 2700mm respectively 2 And 2690mm 2 . The shell contains 4 groups of the battery pole cores connected in parallel.
Comparative example 1
As shown in fig. 1, lithium cobaltate positive electrode slurry is coated on an aluminum foil on both sides, and is dried, rolled, cut and sorted to obtain a positive electrode lamination with the aluminum foil height of 5mm exposed in the length direction of a pole piece, wherein the width of the exposed aluminum foil is 5mm, the width of the positive electrode pole piece is 100mm, and the length of the positive electrode lamination is 50 mm;
coating the silicon-carbon negative electrode slurry on copper foils on two sides, drying, rolling, slitting and sorting to obtain a negative electrode lamination with the exposed copper foil height of 5mm in the length direction of the electrode plate, wherein the width of the exposed copper foil is 5mm, the width of the negative electrode plate is 102mm, and the length of the negative electrode lamination is 50 mm;
the diaphragm is a continuous film belt of a porous resin fiber film, and the width of the diaphragm is 103 mm;
the sum of the thickness of the positive electrode lamination, the thickness of the negative electrode lamination and the thickness of the diaphragm is 0.67 mm;
and (3) carrying out continuous Z-shaped lamination according to the sequence of the diaphragm-cathode lamination-diaphragm-anode lamination- … … -diaphragm-cathode lamination-diaphragm, wherein the lamination layer number is 30, and obtaining the laminated pole core. And the positive electrode lamination and the negative electrode lamination are in non-electrical contact. 1 positive electrode lug with the width of 3mm is welded on the exposed aluminum foil, and 1 negative electrode lug with the width of 3mm is welded on the exposed copper foil. And packaging by using a conventional aluminum-plastic film to obtain the single cell of the comparative example 1.
Comparative example 2
As shown in fig. 4, the sulfur anode slurry is rolled on the aluminum mesh on both sides, and is dried, rolled, cut and sorted to obtain an anode lamination with a maximum exposed aluminum mesh height of 6mm, wherein the single exposed aluminum mesh width is 6mm, the total width is 12mm, the maximum anode plate width is 125mm, and the maximum anode lamination length is 120 mm;
rolling the two sides of a lithium foil on a copper mesh, drying, rolling, slitting and sorting to obtain a negative electrode lamination with the exposed copper mesh height of 6mm, wherein the single width of the exposed copper mesh is 6mm, the total width is 12mm, the maximum width of a negative electrode pole piece is 126mm, and the maximum length of the negative electrode lamination is 121 mm;
the diaphragm is a solid electrolyte film continuous film belt, and the maximum width is 126 mm;
the sum of the thickness of the positive electrode lamination, the thickness of the negative electrode lamination and the thickness of the diaphragm is 1.8 mm;
and (3) carrying out continuous Z-shaped lamination according to the sequence of the diaphragm-cathode lamination-diaphragm-anode lamination- … … -diaphragm-cathode lamination-diaphragm, wherein the lamination layer number is 10, and obtaining the laminated pole core. And no electric contact exists between the positive electrode lamination and the negative electrode lamination. Welding positive pole lugs with the width of 5mm on the exposed aluminum mesh, wherein the total number of the positive pole lugs is 2; and welding negative pole tabs with the width of 5mm on the exposed copper mesh, wherein the total number of the negative pole tabs is 2. And packaging by adopting a conventional aluminum-plastic film to obtain the single cell of the comparative example 2.
The internal resistance, the maximum discharge rate and the 2C sustained discharge temperature rise of the single cells of the examples 1, 3, 1 and 2 were measured by a conventional method, and the results were as follows:
sample (I) Internal resistance of Maximum discharge rate 2C sustained discharge temperature rise
EXAMPLE 1 Single core 0.5 to 2 milliohms 15C 3～5℃
Comparative example 1 Single core 5 to 8 milliohms 5C 12～18℃
EXAMPLE 3 Single core 3 to 9 milliohms 2C
Comparative example 2 Single core 30 to 40 milliohms 0.5C
Therefore, the internal resistance of the single cell in the embodiment is obviously lower than that of the single cell in the comparative example, so that the current conducting capacity of the cell in the embodiment is good, the maximum discharge rate is high, the temperature rise of the cell in the discharge process is less, the heat loss is low, the safety is good, and the cell in the embodiment has higher discharge efficiency and stability.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (22)

1. A laminated power battery is characterized by comprising a battery pole core and a shell for wrapping the battery pole core;
the shell is at least a pentahedron, wherein at least 2 surfaces of the shell are respectively in surface contact and electric connection with the anode current collecting surface and the cathode current collecting surface;
the electric connection area formed by the anode current collecting surface is larger than 95% of the maximum projection area of the anode current collecting surface;
the electric connection area formed by the anode current collecting surface is larger than 95% of the maximum projection area of the anode current collecting surface;
the battery pole core comprises at least one group of laminated pole cores; the laminated pole core includes: the positive electrode comprises a positive electrode lamination, a negative electrode lamination, a diaphragm, a positive electrode current collecting surface and a negative electrode current collecting surface;
a diaphragm is arranged between the positive lamination and the negative lamination, so that the positive lamination and the negative lamination are in no electrical contact;
the positive current collecting surface is an electric connection plane formed by bending and leveling a bare positive current collector in at least any normal direction of the positive lamination direction;
the negative current collecting surface is an electric connection plane formed by bending and leveling a bare negative current collector in at least any normal direction of the negative lamination direction;
the width of the exposed positive current collector is not less than 50% of the maximum width of the pole piece and not more than 100% of the maximum width of the pole piece;
the width of the exposed negative current collector is not less than 50% of the maximum width of the pole piece and not more than 100% of the maximum width of the pole piece;
the height of the positive electrode current collecting surface is not less than 4% of the length of the positive electrode lamination;
the height of the anode current collecting surface is not less than 4% of the length of the anode lamination.
2. The laminated power cell of claim 1, wherein the bare positive current collector and the bare negative current collector are the same height.
3. The laminated power battery of claim 2, wherein the height of the exposed positive and negative current collectors is denoted as H, and the height of the exposed current collector H is 190% -450% of the thickness of the laminated pole core.
4. The laminated power cell of claim 1, wherein when the cell core contains only one set of laminated cores, the height of the positive current collecting face is equal to the height H of the bare positive current collector, and the height of the negative current collecting face is equal to the height H of the bare negative current collector;
when the battery pole core at least comprises two groups of laminated pole cores, the laminated pole cores of each group are arranged in parallel, and a diaphragm is arranged between the adjacent laminated pole cores, so that the positive pole laminations and the negative pole laminations of the adjacent laminated pole cores are not in electric contact.
5. The laminated power cell of claim 4, wherein the positive current collector faces in each laminated core are in the same electrical connection plane;
the negative current collecting surfaces in the laminated pole cores are in the same electric connection plane.
6. The laminated power cell of claim 1 or 2, wherein the positive stack includes a positive current collector and positive electrode material on opposite sides of the positive current collector, and the negative stack includes a negative current collector and negative electrode material on opposite sides of the negative current collector.
7. The laminated power cell of claim 6, wherein the portion of the positive electrode laminate coated with the positive electrode material and the portion of the negative electrode laminate coated with the negative electrode material are the same in shape and size; the plane of the two contacting with the diaphragm is regular or irregular; the exposed positive current collector and the exposed negative current collector have the same or different shapes.
8. The laminated power cell of claim 1, wherein the separator is any one of a porous resin fiber membrane, a solid electrolyte membrane, and a colloidal electrolyte membrane.
9. The laminated power cell of claim 4, wherein when the cell pole core includes at least two groups of laminated pole cores, the membranes in each group of laminated pole cores form a continuous membrane strip.
10. The laminated power battery of claim 6, wherein the positive current collector is at least one of aluminum foil, foamed nickel, aluminum mesh, stainless steel mesh, nickel mesh;
the negative current collector is at least one of copper foil, copper mesh, foamed nickel, stainless steel mesh and nickel mesh.
11. The laminated power cell of claim 1, wherein the method of making the laminated pole core comprises the steps of: assembling the positive lamination with the exposed positive current collector, the negative lamination with the exposed negative current collector and the diaphragm;
wherein the separator is positioned between the positive lamination and the negative lamination;
the bare positive current collector is bent and leveled in at least any normal direction of the positive lamination direction to form an electric connection plane, namely a positive current collecting surface;
and the exposed negative current collector is bent and leveled to form an electric connection plane, namely a negative current collecting surface, in at least any normal direction of the negative lamination.
12. The laminated power cell of claim 11, wherein the process of preparing the positive laminate with the bare positive current collector comprises: coating or rolling the positive electrode material on the positive electrode current collector on the two sides, and drying, rolling, slitting and sorting to obtain a positive electrode lamination with the positive electrode current collector exposed in the length direction of the pole piece and the height of H;
and/or the preparation process of the negative electrode lamination with the naked negative electrode current collector comprises the following steps: and coating or rolling the negative material on the negative current collector on the double surfaces, and drying, rolling, slitting and sorting to obtain the negative lamination with the negative current collector exposed in the length direction of the pole piece and the height of H.
13. The laminated power cell of claim 12, wherein the positive electrode material is at least one of a lithium iron phosphate positive electrode paste, a nickel cobalt manganese positive electrode paste, a lithium manganate positive electrode paste, a lithium cobaltate positive electrode paste, a manganese dioxide positive electrode paste or slurry, a carbon fluoride positive electrode paste or slurry, a sulfide positive electrode paste or slurry, an elemental sulfur positive electrode paste;
and/or the negative electrode material is at least one of graphite negative electrode slurry, silicon-carbon negative electrode slurry, zinc paste, lithium powder or lithium foil and sodium metal.
14. The laminated power cell of claim 1, wherein the separator is a continuous separator strip having a width greater than a width of the positive pole piece.
15. The laminated power cell of claim 11, wherein the method includes a method of making the laminated pole core;
when the battery pole core comprises at least two groups of laminated pole cores, the preparation method comprises the following steps: and at least two groups of laminated pole cores are parallelly stacked to form a cross arrangement of the positive pole laminations and the negative pole laminations, and separators are arranged between the positive pole laminations and the negative pole laminations.
16. The laminated power cell of claim 15, wherein the separator is a continuous separator or a non-continuous separator.
17. The laminated power cell of claim 15, wherein when the cell pole core comprises at least two sets of laminated pole cores, the separator in each laminated pole core is continuous.
18. The laminated power cell of claim 15, wherein the method of making the cell pole core comprises the steps of: carrying out continuous Z-shaped lamination according to the sequence of a diaphragm-a cathode lamination-a diaphragm-an anode lamination- … … -a diaphragm-a cathode lamination-a diaphragm to prepare at least two groups of lamination pole cores; the positive lamination and the negative lamination are separated by a diaphragm, so that no electric contact exists between the positive lamination and the negative lamination; the positive pole bare current collector and the negative pole bare current collector are sequentially stacked in at least any two normal directions of the lamination direction respectively;
the positive pole exposed current collector is bent towards the direction of the lamination in sequence to form electric connection and be leveled into a positive pole current collecting surface;
the negative pole exposes the mass flow body and buckles to the lamination direction in proper order, forms the electricity and connects and levels into the negative pole current collecting face.
19. A method of manufacturing a laminated power cell according to any of claims 1 to 18, comprising the steps of: placing the battery pole core in a shell;
at least 1 group of laminated pole cores are contained in the shell, and all the groups of laminated pole cores are connected in series or in parallel.
20. A power cell pack comprising at least two groups of laminated power cells according to any one of claims 1 to 18.
21. The power battery pack of claim 20, wherein at least two groups of the laminated power batteries are stacked or combined to form a power battery pack connected in series or in parallel.
22. Use of a laminated power cell according to any of claims 1 to 18, or a power cell pack according to any of claims 20 to 21, in the field of rapid charging.
CN202110421020.6A 2021-04-19 2021-04-19 Laminated power battery and preparation method and application thereof Active CN114171771B (en)

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