CN113571754A - Preparation method of coiled bipolar battery and coiled bipolar battery - Google Patents
Preparation method of coiled bipolar battery and coiled bipolar battery Download PDFInfo
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- CN113571754A CN113571754A CN202110689670.9A CN202110689670A CN113571754A CN 113571754 A CN113571754 A CN 113571754A CN 202110689670 A CN202110689670 A CN 202110689670A CN 113571754 A CN113571754 A CN 113571754A
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- 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
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- H01M10/0431—Cells with wound or folded electrodes
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- 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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Abstract
The invention discloses a preparation method of a winding type bipolar battery and the winding type bipolar battery, wherein the preparation method comprises the following steps: respectively coating the positive active slurry and the negative active slurry on the first surface and the second surface of the bipolar current collector, drying after coating, and then rolling and slicing to obtain a double-pole piece; coating a solid electrolyte on any one surface of the first surface or the second surface, and coating an insulating glue on the edge area of the double-pole piece; stacking and bonding n bipolar plates according to a mode that the bonding surfaces of the adjacent bipolar plates are opposite in polarity, and coating the surface of the bonded bipolar plates with a solid electrolyte to obtain n layers of bipolar plates, wherein n is more than or equal to 2; and winding the n layers of bipolar plates into an electric core, welding lugs at the tail parts of the n layers of bipolar plates, drying and packaging to obtain the wound bipolar battery. According to the invention, the bipolar current collector is used, so that the battery generates high voltage, and the energy density of the stacked double-pole piece is increased by more than 10% compared with the tandem battery of the same system by winding.
Description
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to a preparation method of a winding type bipolar battery and the winding type bipolar battery.
Background
The existing bipolar battery is of a laminated structure, the voltage of the bipolar battery is determined by the number of laminated layers, and the bipolar battery is more suitable for manufacturing high-voltage batteries such as dozens of volts or even hundreds of volts, for products with lower voltage requirements, the bipolar battery with lower voltage manufactured by the laminated structure can be manufactured into a battery with thin thickness but large area, and obviously, the bipolar battery is not suitable for electronic products, and the manufacturing cost is higher, or a mode of connecting a plurality of lithium ion batteries in series is adopted, so that the mode wastes space and improves the energy density more difficultly.
Disclosure of Invention
The invention mainly aims to provide a preparation method of a winding type bipolar battery and the winding type bipolar battery, wherein the bipolar current collector coated with an active material is wound with a solid electrolyte, so that the obtained battery has high voltage, good safety and high energy density, and the energy density is increased by more than 10% compared with a series battery of the same system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a preparation method of a winding type bipolar battery, which comprises the following steps:
coating positive active slurry on a first surface of a bipolar current collector, coating negative active slurry on a second surface of the bipolar current collector, drying after coating, rolling, pressing to a preset thickness, and slicing to obtain a double-pole piece;
secondly, coating a solid electrolyte on any one surface of the first surface or the second surface, and coating an insulating glue on the edge area of the double-pole piece;
stacking the n bipolar plates in a mode that the polarities of the bonding surfaces of the adjacent bipolar plates are opposite, applying pressure to the stacked n bipolar plates to bond the bipolar plates with each other, and coating the solid electrolyte on the surfaces of the bonded bipolar plates to obtain n layers of bipolar plates, wherein n is more than or equal to 2;
and step four, winding the n layers of bipolar plates into a battery core, welding tabs at the tail parts of the n layers of bipolar plates, drying and packaging to obtain the wound bipolar battery.
In the first step, the positive active slurry coated on the first surface is dried and rolled to form a positive active layer, and the positive active layer and a positive current collector form a positive electrode; and drying and rolling the negative active slurry coated on the second surface to form a negative active layer, wherein the negative active layer and a negative current collector form a negative electrode. And (4) slicing the rolled bipolar current collector by using a die cutting machine, and cutting the bipolar current collector into a proper shape and size. In the second step, the solid electrolyte includes an inorganic solid electrolyte, a solid polymer electrolyte, a composite polymer electrolyte and a gel polymer electrolyte, and functions as an electrolyte and a separator.
Specifically, the bipolar current collector comprises a copper-aluminum composite foil or an aluminum-nickel composite foil, and the thickness of the bipolar current collector is 3-28 micrometers. The first surface is an aluminum foil, the second surface is a copper foil or a nickel foil, the bipolar current collector is free of holes, once holes exist in the used foil, electrolyte can easily enter, and a battery is short-circuited, when holes exist in the aluminum foil, the copper foil or the nickel foil on the other surface can be easily oxidized and corroded, the aluminum foil is conducted with the copper foil or the nickel foil, the electronic transmission path of the battery is greatly reduced in a longitudinal electronic transmission mode, the internal resistance of the battery is reduced, and the battery can conduct well; preferably, the bipolar current collector has a thickness of 10 to 20 μm. Within the above range, the bipolar current collector can satisfy flexibility upon winding, and also has low impedance and high conductivity.
Specifically, in the first step, the edge region of the bipolar current collector is not coated with the positive electrode active slurry and the negative electrode active slurry. The bipolar current collectors which are not coated are left in the edge areas, so that the insulating glue can be bonded more firmly, meanwhile, electrolyte is prevented from being left between layers to cause communication, and the adjacent bipolar current collectors can be insulated.
Specifically, in the first step, the roller is pressed to a predetermined thickness of 25 μm to 200 μm. Pressing the bipolar plate to 25-200 mu m to ensure that the surface of the bipolar plate is smooth and flat, and preventing burrs on the surface of a coating from piercing the solid electrolyte to cause short circuit; compacting the coating material of the bipolar plate to reduce the volume of the bipolar plate so as to improve the energy density of the battery; the contact between the active substance and the conductive agent particles in the active layer is more compact, and the electronic conductivity is improved; the bonding strength of the active layer and the bipolar current collector is enhanced, the occurrence of powder falling of a battery pole piece in the circulating process is reduced, and the circulating life and the safety performance of the battery are improved.
Specifically, in the third step, the applied pressure is 20 Kpa-5 Mpa. And the thickness of the superposed double pole pieces is reduced, so that the double pole pieces can be more compact, and the migration distance of ions between the solid electrolytes is reduced.
Specifically, in the second step, the insulating glue includes a hot melt adhesive, an acrylic glue or a silica gel.
Specifically, in the third step, n is 2 to 12, preferably 2 to 5. In the above-mentioned number of piles, can make n layer bipolar plate fine coiling, the volume of control back bipolar battery that simultaneously can be fine has avoided the number of piles too much to lead to when coiling the tension of bipolar plate is too big, coiled bipolar battery is littleer for the shared volume of the lamination formula bipolar battery of the equal number of piles, is more applicable to electronic product.
Specifically, in the fourth step, an aluminum tab and a nickel tab are respectively welded on the first surface and the second surface of the tail part of the n layers of double pole pieces, which are not coated with the solid electrolyte.
The invention also discloses a winding type bipolar battery, which is prepared by the preparation method in any one of the schemes, and the winding type bipolar battery comprises at least two bipolar plates and solid electrolyte clamped between the bipolar plates.
Specifically, the nominal voltage of the wound bipolar battery is X, the relational expression between X and the number n of wound bipolar plates is X ═ n-1 × U, n is greater than or equal to 2, and U depends on a material system. In the 4.2V system, the U is 3.7V, in the 4.35V system, the U is 3.8V, in the 4.4V system, the U is 3.85V, and the like, and the higher nominal voltage battery can be obtained by using the anode material of the higher voltage system.
Compared with the prior art, the invention at least comprises the following beneficial effects: by using the bipolar current collector, the coiled bipolar battery has high voltage and high energy density, and the energy density is increased by more than 10% compared with a series battery of the same system; the insulating glue is coated on the edge area of the bipolar plate, so that the electrolyte is prevented from flowing out to cause communication, the adjacent bipolar plates are prevented from contacting short circuit, and the safety of the battery is improved.
Drawings
Fig. 1 is a flow chart of a method of manufacturing a wound bipolar battery of the present invention;
FIG. 2 is a schematic structural view of a 2-layer bi-polar sheet prepared in example;
FIG. 3 is a schematic structural view of a 3-layer bi-polar sheet prepared in example;
FIG. 4 is a schematic structural view of a 4-layer bi-polar sheet prepared in example;
FIG. 5 is a schematic structural view of a 5-layer bi-polar sheet prepared in example;
in the figure: 1-a bipolar current collector; 2-positive electrode active layer; 3-a negative active layer; 4-a solid electrolyte; 5-insulating glue.
Detailed Description
The present invention will be further described below with reference to the accompanying drawings for easier understanding, but the present invention can be implemented in various forms, and is not limited to the embodiments described herein and does not constitute any limitation to the present invention.
The embodiment provides a preparation method of a wound bipolar battery, which comprises the following steps:
coating positive active slurry on a first surface of a bipolar current collector, coating negative active slurry on a second surface of the bipolar current collector, drying after coating, rolling, pressing to a preset thickness, and slicing to obtain a double-pole piece;
coating a solid electrolyte on any one surface of the first surface or the second surface, and coating an insulating glue on the edge area of the double-pole piece;
stacking n bipolar plates according to a mode that the polarities of the bonding surfaces of the adjacent bipolar plates are opposite, applying pressure to the stacked n bipolar plates to bond the stacked bipolar plates, coating the surface of the bonded bipolar plates with a solid electrolyte to obtain n layers of bipolar plates, wherein n is more than or equal to 1;
and step four, winding the n layers of bipolar plates into a battery core, welding tabs at the tail parts of the n layers of bipolar plates, drying and packaging to obtain the wound bipolar battery.
In the first step, the positive active slurry coated on the first surface is dried and rolled to form a positive active layer 2, and the positive active layer 2 and a positive current collector form a positive electrode; and drying and rolling the cathode active slurry coated on the second surface to form a cathode active layer 3, wherein the cathode active layer 3 and a cathode current collector form a cathode. And (3) slicing the rolled bipolar current collector 1 by using a die cutting machine, and cutting the bipolar current collector 1 into a proper shape and size. In the second step, the solid electrolyte 4 includes an inorganic solid electrolyte, a solid polymer electrolyte, a composite polymer electrolyte, and a gel polymer electrolyte, and functions as an electrolyte and a separator.
Preferably, the bipolar current collector 1 comprises a copper-aluminum composite foil or an aluminum-nickel composite foil, and the thickness is 3-28 μm. The first surface is an aluminum foil, the second surface is a copper foil or a nickel foil, the bipolar current collector 1 has no holes, once holes exist in the used foil, electrolyte can easily enter to cause short circuit of the battery, when the aluminum foil has holes, the copper foil or the nickel foil on the other surface can easily cause oxidation corrosion, the aluminum foil is conducted with the copper foil or the nickel foil, the electronic transmission path of the battery is greatly reduced by a longitudinal electronic transmission mode, the internal resistance of the battery is reduced, and the battery can conduct well; more preferably, the thickness of bipolar current collector 1 is 10 to 20 μm. Within the above range, the bipolar current collector 1 can satisfy flexibility upon winding, and has low impedance and high conductivity.
Preferably, in step one, the edge region of bipolar current collector 1 is not coated with the positive and negative active pastes. By leaving uncoated bipolar current collectors 1 in the edge regions, the adhesive 5 can be bonded more firmly, while preventing electrolyte from leaving between the layers to create communication, and insulating adjacent bipolar current collectors 1.
Preferably, in the first step, the roller is pressed to a predetermined thickness of 25 μm to 200 μm. Pressing the double pole pieces to 25-200 mu m to ensure that the surfaces of the double pole pieces are smooth and flat, and preventing burrs on the surface of a coating from piercing the solid electrolyte 4 to cause short circuit; compacting the coating material of the bipolar plate to reduce the volume of the bipolar plate so as to improve the energy density of the battery; the contact between the active substance and the conductive agent particles in the active layer is more compact, and the electronic conductivity is improved; the bonding strength of the active layer and the bipolar current collector 1 is enhanced, the occurrence of powder falling of the battery pole piece in the circulating process is reduced, and the circulating life and the safety performance of the battery are improved.
Preferably, in the third step, the pressure is 20 Kpa-5 MPa. The thickness of the bipolar plates after stacking is reduced, so that the bipolar plates can be more compact, and the migration distance of ions between the solid electrolytes 4 is reduced.
Preferably, in the second step, the insulating glue 5 includes a hot melt glue, an acrylic glue or a silicone glue.
Preferably, in the third step, n is 2 to 12, preferably 2 to 5. In the above-mentioned number of piles, can make n layer bipolar plate fine convolute, the volume of bipolar battery after the control coiling that simultaneously can be fine has avoided the number of piles too much to lead to when coiling the tension of bipolar plate too big, and coiling formula bipolar battery is littleer for the shared volume of lamination formula bipolar battery of the equal number of piles, more is applicable to electronic product.
Preferably, in the fourth step, an aluminum tab and a nickel tab are respectively welded on the first surface and the second surface of the tail part of the n-layer bipolar plate, which are not coated with the solid electrolyte 4.
The embodiment also provides a wound bipolar battery, which is prepared by the preparation method in any one of the above schemes, and the wound bipolar battery comprises at least two bipolar plates and a solid electrolyte 4 sandwiched between the bipolar plates.
Preferably, the nominal voltage of the wound bipolar battery is X, and the relation between X and the number n of wound bipolar sheets is X ═ n-1 ×. U, n ≧ 2, and U is determined by the material system. The size of U depends on the material system, 3.7V for U in 4.2V system, 3.8V for U in 4.35V system, 3.85V for U in 4.4V system, and so on, and higher nominal voltage batteries can be obtained by using the anode material of higher voltage system.
Compared with the prior art, the present embodiment at least includes the following beneficial effects: in the embodiment, the bipolar current collector 1 is used, so that the coiled bipolar battery has high voltage and high energy density, and the energy density is increased by more than 10% compared with a series battery of the same system; the insulating glue 5 is coated on the edge area of the bipolar plate, so that the electrolyte is prevented from flowing out to cause communication, meanwhile, the contact short circuit of the adjacent bipolar plates is prevented, and the safety of the battery is improved.
The following further description is made by the accompanying drawings and the specific embodiments
Example 1
As shown in fig. 1 to 2, the present embodiment provides a method for manufacturing a wound bipolar battery, which includes the following specific steps:
step one, adopting a 4.2v positive electrode material system, selecting a copper-aluminum composite foil with the thickness of 10 microns for a bipolar current collector 1, coating active slurry on the surface of the copper-aluminum composite foil, coating the positive electrode active slurry on the surface of the aluminum foil, coating the negative electrode active slurry on the surface of the copper foil, drying after coating, rolling again until the thickness is 25 microns, and then slicing to obtain a bipolar plate, wherein the positive electrode active slurry coated on the surface of the aluminum foil in the bipolar plate is a positive electrode active layer 2, and the negative electrode active slurry coated on the surface of the copper foil in the bipolar plate is a negative electrode active layer 3;
coating a solid electrolyte 4 on one surface of the double-pole piece, and coating an insulating adhesive 5 on the edge area of the double-pole piece, wherein the insulating adhesive 5 can be a hot melt adhesive, an acrylic adhesive or a silica gel;
step three, stacking 2 bipolar plates, applying pressure of 20Kpa to bond the stacked 2 bipolar plates, coating the surface of the bonded bipolar plates with the solid electrolyte 4 to obtain 2 layers of bipolar plates, wherein when stacking, the surface of the 1 st bipolar plate, which is not coated with the solid electrolyte 4, is bonded with the surface of the 2 nd bipolar plate, which is coated with the solid electrolyte 4, and the polarity of the bonding surfaces of the adjacent bipolar plates is opposite;
and step four, firstly winding the 2 layers of bipolar plates into a cylindrical battery or a similar cylindrical battery or a square battery core, welding a lug at the tail part of the 2 layers of bipolar plates, welding a nickel lug on the surface of copper foil, welding an aluminum lug on the surface of aluminum foil, drying and packaging to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 3.7V.
Example 2
As shown in fig. 3, unlike example 1, in the third step, in this example, 40Kpa of pressure is applied to bond the stacked 3 bipolar plates to each other, and then solid electrolyte 4 is coated on the surface of the bonded bipolar plates to obtain 3-layer bipolar plates, when stacking, the side of the 1 st bipolar plate, which is not coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is coated with solid electrolyte 4, the side of the 3 rd bipolar plate, which is coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is not coated with solid electrolyte 4, and the side of the bonded 3 rd bipolar plate, which is not coated with solid electrolyte 4, is coated with solid electrolyte 4, and the bonding surfaces of the adjacent bipolar plates have opposite polarities; in the fourth step, the 3 layers of bipolar plates are firstly wound into the battery core, then the tabs are welded at the tail parts of the 3 layers of bipolar plates, and the battery is dried and packaged to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 7.4V.
The other steps are the same as in example 1 and are not described in detail here.
Example 3
As shown in fig. 4, unlike example 1, in the third step, in this example, a pressure of 70Kpa is applied to bond the stacked 4 bipolar plates to each other, and then the solid electrolyte 4 is coated on the surface of the bonded bipolar plates, so as to obtain 4-layer bipolar plates, when stacked, one side of the 1 st bipolar plate, which is not coated with the solid electrolyte 4, is bonded to one side of the 2 nd bipolar plate, which is coated with the solid electrolyte 4, and one side of the 3 rd bipolar plate, which is coated with the solid electrolyte 4, is bonded to one side of the 2 nd bipolar plate, which is not coated with the solid electrolyte 4, and one side of the 4 th bipolar plate, which is coated with the solid electrolyte 4, is bonded to one side of the 3 rd bipolar plate, which is not coated with the solid electrolyte 4, and the polarities of the adjacent bipolar plates are opposite; in the fourth step, the 4 layers of bipolar plates are firstly wound into an electric core, then the tail parts of the 4 layers of bipolar plates are welded with lugs, and the wound bipolar battery is obtained after drying and packaging, wherein the nominal voltage of the wound bipolar battery is 11.1V.
The other steps are the same as in example 1 and are not described in detail here.
Example 4
As shown in fig. 5, unlike example 1, in this example, 5 bipolar sheets were stacked in step three to obtain 5-layered bipolar sheets; in the fourth step, the 5 layers of bipolar plates are firstly wound into an electric core, then the tail parts of the 5 layers of bipolar plates are welded with lugs, and the wound bipolar battery is obtained after drying and packaging, wherein the nominal voltage of the wound bipolar battery is 11.8V.
The other steps are the same as in example 1 and are not described in detail here.
Example 5
As shown in fig. 1, different from example 1, in this embodiment, in step 1, an aluminum-nickel composite foil with a thickness of 10 μm is used as a bipolar current collector 1, active slurry is coated on the surface of the aluminum-nickel composite foil, positive active slurry is coated on the surface of the aluminum foil, negative active slurry is coated on the surface of the nickel foil, after the coating is completed, drying is performed, rolling is performed again until the thickness is 25 μm, and then slicing is performed to obtain a bipolar plate, where the positive active slurry coated on the surface of the aluminum foil in the bipolar plate is a positive active layer 2, and the negative active slurry coated on the surface of the nickel foil in the bipolar plate is a negative active layer 3.
The other steps are the same as in example 1 and are not described in detail here.
Example 6
As shown in fig. 1 to 2, the present embodiment provides a method for manufacturing a wound bipolar battery, which includes the following specific steps:
step one, adopting a 4.35v positive electrode material system, selecting a copper-aluminum composite foil with the thickness of 10 microns for a bipolar current collector 1, coating active slurry on the surface of the copper-aluminum composite foil, coating the positive electrode active slurry on the surface of the aluminum foil, coating the negative electrode active slurry on the surface of the copper foil, drying after coating, rolling again, pressing until the thickness is 25 microns, and then slicing to obtain a bipolar plate, wherein the positive electrode active slurry coated on the surface of the aluminum foil in the bipolar plate is a positive electrode active layer 2, and the negative electrode active slurry coated on the surface of the copper foil in the bipolar plate is a negative electrode active layer 3;
coating a solid electrolyte 4 on one surface of the double-pole piece, and coating an insulating adhesive 5 on the edge area of the double-pole piece, wherein the insulating adhesive 5 can be a hot melt adhesive, an acrylic adhesive or a silica gel;
step three, stacking 2 bipolar plates, applying pressure of 20Kpa to bond the stacked 2 bipolar plates, coating the surface of the bonded bipolar plates with the solid electrolyte 4 to obtain 2 layers of bipolar plates, wherein when stacking, the surface of the 1 st bipolar plate, which is not coated with the solid electrolyte 4, is bonded with the surface of the 2 nd bipolar plate, which is coated with the solid electrolyte 4, and the polarity of the bonding surfaces of the adjacent bipolar plates is opposite;
and step four, firstly winding the 2 layers of bipolar plates into a cylindrical battery or a similar cylindrical battery or a square battery core, welding a lug at the tail part of the 2 layers of bipolar plates, welding a nickel lug on the surface of copper foil, welding an aluminum lug on the surface of aluminum foil, drying and packaging to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 3.8V.
Example 7
As shown in fig. 3, unlike example 6, in this example, in step three, a pressure of 40Kpa is applied to bond 3 stacked bipolar plates to each other, and then solid electrolyte 4 is coated on the surface of the bonded bipolar plates to obtain 3-layer bipolar plates, when stacking, the side of the 1 st bipolar plate, which is not coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is coated with solid electrolyte 4, the side of the 3 rd bipolar plate, which is coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is not coated with solid electrolyte 4, and the side of the bonded 3 rd bipolar plate, which is not coated with solid electrolyte 4, is coated with solid electrolyte 4, and the bonding surfaces of adjacent bipolar plates have opposite polarities; in the fourth step, the 3 layers of bipolar plates are firstly wound into the battery core, then the tabs are welded at the tail parts of the 3 layers of bipolar plates, and the battery is dried and packaged to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 7.6V.
The other steps are the same as in example 6 and are not described in detail here.
Example 8
As shown in fig. 4, unlike example 6, in this example, in step three, a pressure of 70Kpa is applied to bond 4 stacked bipolar plates to each other, and then solid electrolyte 4 is coated on the surface of the bonded bipolar plates to obtain 4-layer bipolar plates, when stacked, the side of the 1 st bipolar plate, which is not coated with the solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is coated with the solid electrolyte 4, the side of the 3 rd bipolar plate, which is coated with the solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is not coated with the solid electrolyte 4, the side of the 4 th bipolar plate, which is coated with the solid electrolyte 4, is bonded to the side of the 3 rd bipolar plate, which is not coated with the solid electrolyte 4, and the polarities of the adjacent bipolar plates are opposite; in the fourth step, the 4 layers of bipolar plates are firstly wound into an electric core, then the tail parts of the 4 layers of bipolar plates are welded with lugs, and the wound bipolar battery is obtained after drying and packaging, wherein the nominal voltage of the wound bipolar battery is 11.4V.
The other steps are the same as in example 6 and are not described in detail here.
Example 9
As shown in fig. 5, unlike example 6, in this example, 5 bipolar sheets were stacked in step three to obtain 5-layered bipolar sheets; in the fourth step, the 5 layers of bipolar plates are firstly wound into an electric core, then the tail parts of the 5 layers of bipolar plates are welded with lugs, and the wound bipolar battery is obtained after drying and packaging, wherein the nominal voltage of the wound bipolar battery is 15.2V.
The other steps are the same as in example 6 and are not described in detail here.
Example 10
As shown in fig. 1 to 2, the present embodiment provides a method for manufacturing a wound bipolar battery, which includes the following specific steps:
step one, adopting a 4.4v positive electrode material system, selecting a copper-aluminum composite foil with the thickness of 10 microns for a bipolar current collector 1, coating active slurry on the surface of the copper-aluminum composite foil, coating the positive electrode active slurry on the surface of the aluminum foil, coating the negative electrode active slurry on the surface of the copper foil, drying after coating, rolling again until the thickness is 25 microns, and then slicing to obtain a bipolar plate, wherein the positive electrode active slurry coated on the surface of the aluminum foil in the bipolar plate is a positive electrode active layer 2, and the negative electrode active slurry coated on the surface of the copper foil in the bipolar plate is a negative electrode active layer 3;
coating a solid electrolyte 4 on one surface of the double-pole piece, and coating an insulating adhesive 5 on the edge area of the double-pole piece, wherein the insulating adhesive 5 can be a hot melt adhesive, an acrylic adhesive or a silica gel;
step three, stacking 2 bipolar plates, applying pressure of 20Kpa to bond the stacked 2 bipolar plates, coating the surface of the bonded bipolar plates with the solid electrolyte 4 to obtain 2 layers of bipolar plates, wherein when stacking, the surface of the 1 st bipolar plate, which is not coated with the solid electrolyte 4, is bonded with the surface of the 2 nd bipolar plate, which is coated with the solid electrolyte 4, and the polarity of the bonding surfaces of the adjacent bipolar plates is opposite;
and step four, firstly winding the 2 layers of bipolar plates into a cylindrical battery or a similar cylindrical battery or a square battery core, welding a lug at the tail part of the 2 layers of bipolar plates, welding a nickel lug on the surface of copper foil, welding an aluminum lug on the surface of aluminum foil, drying and packaging to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 3.85V.
Example 11
As shown in fig. 3, unlike example 10, in this example, in step three, a pressure of 40Kpa is applied to bond 3 stacked bipolar plates to each other, and then solid electrolyte 4 is coated on the surface of the bonded bipolar plates to obtain 3-layer bipolar plates, when stacking, the side of the 1 st bipolar plate, which is not coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is coated with solid electrolyte 4, the side of the 3 rd bipolar plate, which is coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is not coated with solid electrolyte 4, and the side of the bonded 3 rd bipolar plate, which is not coated with solid electrolyte 4, is coated with solid electrolyte 4, and the bonding surfaces of adjacent bipolar plates have opposite polarities; in the fourth step, the 3 layers of bipolar plates are firstly wound into the battery core, then the tabs are welded at the tail parts of the 3 layers of bipolar plates, and the battery is dried and packaged to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 7.7V.
The other steps are the same as in example 10 and are not described herein in detail.
Example 12
As shown in fig. 4, unlike example 10, in this example, in step three, a pressure of 70Kpa is applied to bond 4 stacked bipolar plates to each other, and then solid electrolyte 4 is coated on the surface of the bonded bipolar plates to obtain 4-layer bipolar plates, when stacked, the side of the 1 st bipolar plate, which is not coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is coated with solid electrolyte 4, the side of the 3 rd bipolar plate, which is coated with solid electrolyte 4, is bonded to the side of the 2 nd bipolar plate, which is not coated with solid electrolyte 4, the side of the 4 th bipolar plate, which is coated with solid electrolyte 4, is bonded to the side of the 3 rd bipolar plate, which is not coated with solid electrolyte 4, and the polarities of the adjacent bipolar plates are opposite; in the fourth step, the 4 layers of bipolar plates are firstly wound into an electric core, then the tail parts of the 4 layers of bipolar plates are welded with tabs, and drying and packaging are carried out to obtain the wound bipolar battery, wherein the nominal voltage of the wound bipolar battery is 11.55V.
The other steps are the same as in example 10 and are not described herein in detail.
Example 13
As shown in fig. 5, unlike example 10, in this example, 5 bipolar sheets were stacked in step three to obtain 5-layered bipolar sheets; in the fourth step, the 5 layers of bipolar plates are firstly wound into an electric core, then the tail parts of the 5 layers of bipolar plates are welded with lugs, and the wound bipolar battery is obtained after drying and packaging, wherein the nominal voltage of the wound bipolar battery is 15.4V.
The other steps are the same as in example 10 and are not described herein in detail.
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the inventive concepts herein.
Claims (10)
1. A method of making a wound bipolar battery, comprising the steps of:
coating positive active slurry on a first surface of a bipolar current collector, coating negative active slurry on a second surface of the bipolar current collector, drying after coating, rolling, pressing to a preset thickness, and slicing to obtain a double-pole piece;
secondly, coating a solid electrolyte on any one surface of the first surface or the second surface, and coating an insulating glue on the edge area of the double-pole piece;
stacking the n bipolar plates in a mode that the polarities of the bonding surfaces of the adjacent bipolar plates are opposite, applying pressure to the stacked n bipolar plates to bond the bipolar plates with each other, and coating the solid electrolyte on the surfaces of the bonded bipolar plates to obtain n layers of bipolar plates, wherein n is more than or equal to 2;
and step four, winding the n layers of bipolar plates into a battery core, welding tabs at the tail parts of the n layers of bipolar plates, drying and packaging to obtain the wound bipolar battery.
2. The method for preparing a coiled bipolar battery according to claim 1, wherein in the first step, the bipolar current collector comprises a copper-aluminum composite foil or an aluminum-nickel composite foil, and the thickness of the bipolar current collector is 3-28 μm.
3. A method of manufacturing a rolled bipolar battery as claimed in claim 1, wherein in step one, the edge region of the bipolar current collector is not coated with the positive electrode active paste and the negative electrode active paste.
4. The method of manufacturing a rolled bipolar battery according to claim 1, wherein in the first step, the roll is pressed to a predetermined thickness of 25 μm to 200 μm.
5. The method of manufacturing a rolled bipolar battery according to claim 1, wherein the pressure applied in step three is 20Kpa to 5 Mpa.
6. A method for manufacturing a rolled bipolar battery as claimed in claim 1, wherein in the second step, the insulating glue comprises a hot melt glue, an acrylic glue or a silicone glue.
7. The method for producing a rolled bipolar battery according to claim 1, wherein n is 2 to 12 in step three.
8. A method for manufacturing a rolled bipolar battery as claimed in claim 1, wherein in step four, an aluminum tab and a nickel tab are welded to the first surface and the second surface of the tail portion of the n-layer bipolar plate, which are not coated with the solid electrolyte, respectively.
9. A coiled bipolar battery, which is prepared by the preparation method according to any one of claims 1 to 8, and which comprises at least two bipolar plates and a solid electrolyte sandwiched between the bipolar plates.
10. A wound bipolar battery as claimed in claim 9, wherein the nominal voltage of the wound bipolar battery is X, and the relationship between X and the number n of wound bipolar sheets is X ═ (n-1) × U, n ≧ 2, and U depends on the material system.
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