CN120978165A - An all-solid-state battery and its manufacturing method - Google Patents
An all-solid-state battery and its manufacturing methodInfo
- Publication number
- CN120978165A CN120978165A CN202510896536.4A CN202510896536A CN120978165A CN 120978165 A CN120978165 A CN 120978165A CN 202510896536 A CN202510896536 A CN 202510896536A CN 120978165 A CN120978165 A CN 120978165A
- Authority
- CN
- China
- Prior art keywords
- insulating strip
- positive electrode
- plate
- positive
- composite negative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses an all-solid-state battery and a manufacturing method thereof, which relate to the technical field of batteries, wherein the all-solid-state battery takes a composite negative plate as a carrier of a first insulating strip and a second insulating strip, the first insulating strip and the second insulating strip wrap the positive plate to remove the outer side wall of one side of a positive electrode lug, the root of the positive electrode lug is close to the side of the composite negative plate and comprises a third insulating strip, therefore, the positive plate and the composite negative plate are prevented from being shorted in the isostatic pressing process, the width of the third insulating strip is smaller than the width of the positive electrode lug along the first direction, and the positive electrode lug and the composite negative plate are prevented from being shorted and meanwhile are not influenced to be electrically connected with an external circuit.
Description
Technical Field
The present invention relates to the field of battery technology, and more particularly, to an all-solid-state battery and a method of manufacturing the same.
Background
The all-solid-state battery has the core advantage that the solid electrolyte is adopted to replace the traditional liquid electrolyte, so that the safety and the performance of the battery are greatly improved. The solid electrolyte can not improve the energy density, but has the characteristics of stability, safety, wide electrochemical window and the like compared with electrolyte, so that the solid electrolyte can be compatible with positive and negative electrodes with high specific capacity, and further greatly improve the energy density of the battery core; in addition, the electrolyte of the traditional liquid lithium ion battery has fluidity, the internal stacking series connection is easy to generate short circuit, thereby causing self discharge and heat release, the solid electrolyte does not have fluidity, the solid battery can realize the series connection and the pressure increase in the battery core, the packaging cost of the battery core can be reduced, and the volume energy density is increased.
The solid-state battery in the prior art generally adopts a method of assembling the solid-state electrolyte on the surface of the positive plate and the negative plate into the battery, and the die cutting area of the negative plate in the traditional lithium ion battery pole piece production process is larger than that of the positive plate, however, burrs are formed at the edge of the pole piece in the die cutting process, the burrs at the edge of the positive plate with smaller area are directly overlapped on the negative plate, and the battery is at short circuit risk in the densification isostatic pressing process, so that the battery performance is reduced.
Accordingly, there is a continuing need to provide an all-solid-state battery capable of preventing the occurrence of a short circuit in the positive and negative electrodes, which may result in a decrease in performance, and a method of manufacturing the same.
Disclosure of Invention
In view of the above, the present invention provides an all-solid-state battery and a method for manufacturing the same, which are used for preventing the battery performance from being reduced due to the occurrence of short-circuiting of the positive and negative electrodes during densification isostatic pressing.
In one aspect, the invention discloses an all-solid-state battery, comprising a positive plate and a composite negative plate which are stacked, wherein one side of the composite negative plate, which is attached to the positive plate, comprises a solid electrolyte membrane, the positive electrode tab of the positive plate and the negative electrode tab of the composite negative plate are oppositely arranged along a first direction,
The periphery of one side of the composite negative electrode plate, which is close to the positive electrode plate, comprises a first insulating strip and a second insulating strip, wherein the first insulating strip is positioned on one side of the composite negative electrode plate, which is opposite to the positive electrode lug, the second insulating strip is oppositely arranged along a second direction, the second insulating strip is connected with the first insulating strip, the second direction is vertically intersected with the first direction, and the first insulating strip and the second insulating strip wrap the outer side wall of the positive electrode plate;
and one side, close to the composite negative plate, of the root of the positive electrode tab comprises a third insulating strip, and the width of the third insulating strip is smaller than that of the positive electrode tab along the first direction.
Optionally, in the second direction, the length of the first insulating strip is m, the width of the second insulating strip is n, and the width of the composite negative electrode sheet is k, where m+2×n=k;
along the first direction, the length of the second insulating strip is equal to the length of the composite negative plate;
and along the second direction, the width of the third insulating strip is equal to the width of the positive electrode lug.
Optionally, the width of the first insulating strip is between 1mm and 4mm along the first direction.
Optionally, n is more than or equal to 1mm and less than or equal to 4mm.
Optionally, along the first direction, the width of the third insulating strip is A, and the width of the positive electrode tab is B, wherein A is more than or equal to 1/5B and less than or equal to 1/4B.
Optionally, the thickness of the first insulating strip and the thickness of the second insulating strip are equal to the thickness of the positive electrode tab along the thickness direction of the all-solid battery.
Optionally, the material of the first insulating strip, the second insulating strip, and the third insulating strip includes one of a hot melt adhesive, a UV curable adhesive, a ceramic adhesive, or a silicone adhesive.
Optionally, the positive plate comprises a positive current collector and a positive active material positioned on one side of the positive current collector close to the composite negative plate, and the positive tab is formed by extending the positive current collector;
The thickness of the third insulating strip is equal to the thickness of the positive electrode active material in the thickness direction of the all-solid battery.
In another aspect, the present invention also provides a method of manufacturing an all-solid battery, including the steps of forming a unit laminate sheet:
Providing a positive plate substrate, coating insulating glue on two sides of the positive plate substrate correspondingly to form a third insulating strip, and carrying out die cutting on the positive plate substrate to form a positive plate, wherein the coating position is a first distance from the edge of the positive plate substrate, so that the third insulating strip is positioned at the root part of a positive electrode lug of the positive plate;
providing a composite negative plate substrate, wherein one side, attached to the positive plate, of the composite negative plate substrate comprises a solid electrolyte membrane, and die cutting is carried out on the composite negative plate substrate to form a composite negative plate;
stacking, namely stacking the positive plate on one side of the composite negative plate, wherein a positive electrode tab of the positive plate is opposite to a negative electrode tab of the composite negative plate along a first direction, and aligning one side of the positive plate, on which the third insulating strip is arranged, with the opposite side of the negative electrode tab of the composite negative plate; the edge of the opposite side of the positive electrode tab in the positive electrode sheet and the edge of the side, close to the negative electrode tab, of the composite negative electrode sheet are provided with a first reserved distance along the first direction;
The method comprises the steps of coating insulating glue in a first reserved distance on the composite negative plate to form a first insulating strip, and coating insulating glue in a second reserved distance on the composite negative plate to form a second insulating strip, so that the first insulating strip and the second insulating strip wrap the outer side wall of the positive plate to form a unit lamination;
And a step of stacking the unit laminations.
Optionally, the contour of the positive plate is detected online, so that a first reserved distance is formed between the edge of the opposite side of the positive electrode tab in the positive plate and the edge of the side, close to the negative electrode tab, of the composite negative electrode plate along the first direction, and a second reserved distance is formed between the edge of the positive plate and the edge of the composite negative electrode plate along the second direction.
Compared with the prior art, the all-solid-state battery and the manufacturing method thereof provided by the invention have the advantages that at least the following beneficial effects are realized:
The all-solid-state battery comprises a positive plate and a composite negative plate which are arranged in a stacked manner, wherein one side, attached to the positive plate, of the composite negative plate comprises a solid electrolyte membrane, a positive electrode lug of the positive plate and a negative electrode lug of the composite negative plate are oppositely arranged along a first direction, the periphery of one side, close to the positive plate, of the composite negative plate comprises a first insulating strip and a second insulating strip, the first insulating strip is positioned on one side, opposite to the positive electrode lug, of the composite negative plate, the second insulating strip is oppositely arranged along a second direction, the second insulating strip is connected with the first insulating strip, the second direction is perpendicular to the first direction, the first insulating strip and the second insulating strip wrap the outer side wall of the positive plate, one side, close to the positive electrode lug, of the root of the positive electrode lug comprises a third insulating strip, and the width of the third insulating strip is smaller than the width of the positive electrode lug along the first direction. According to the invention, the composite negative plate is used as a supporting body, the first insulating strip and the second insulating strip are arranged on the composite negative plate, the side wall of the opposite side of the positive plate positive lug is wrapped by the first insulating strip, so that the positive and negative short circuits on the opposite side of the positive plate positive lug are prevented, the two side walls of the positive plate opposite along the second direction are wrapped by the second insulating strip, the short circuits between the two opposite sides of the positive plate along the second direction and the composite negative plate are prevented, the third insulating strip is arranged at the root of the positive plate, the short circuits between the root of the positive plate and the composite negative plate are prevented, and the problem of the short circuits on the positive and negative electrodes in the isostatic pressing process can be further prevented by comprehensively arranging the first insulating strip, the second insulating strip and the third insulating strip.
Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic view of the structure of an all-solid-state battery provided by the present invention;
Fig. 2 is a schematic structural view of a positive plate according to the present invention;
FIG. 3 is a schematic structural view of a composite negative plate provided by the invention;
FIG. 4 is a schematic structural view of a composite negative plate without a positive plate;
fig. 5 is a schematic plan view of an all-solid-state battery according to the present invention;
FIG. 6 is a cross-sectional view taken along the direction A-A' in FIG. 5;
FIG. 7 is a cross-sectional view taken in the direction B-B' of FIG. 5;
Fig. 8 is a flowchart of a method of manufacturing an all-solid battery according to the present invention;
Fig. 9 is a comparison of the positive electrode sheet substrate before and after die cutting.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Referring to fig. 1 to 7, the invention discloses an all-solid-state battery 100, which comprises a positive plate 1 and a composite negative plate 2 which are stacked, wherein one side, attached to the positive plate 1, of the composite negative plate 2 comprises a solid electrolyte membrane 3, a positive electrode tab 101 of the positive plate 1 and a negative electrode tab 201 of the composite negative plate 2 are oppositely arranged along a first direction X, the periphery of one side, close to the positive plate 1, of the composite negative plate 2 comprises a first insulating strip 4 and a second insulating strip 5, the first insulating strip 4 is positioned on one side, opposite to the positive electrode tab 101, of the composite negative plate 2, the second insulating strip 5 is oppositely arranged along a second direction Y, the second insulating strip 5 is connected with the first insulating strip 4, the second direction Y perpendicularly intersects the first direction X, the first insulating strip 4 and the second insulating strip 5 wrap the outer side wall of the positive plate 1, the root of the positive electrode tab 101 comprises a third insulating strip 6, and the width of the third strip 6 is smaller than the width of the positive electrode tab 101 along the first direction X.
Specifically, the all-solid-state battery 100 in this embodiment is a stacked structure of a positive electrode sheet 1-a composite negative electrode sheet 2-a positive electrode sheet 1-a composite negative electrode sheet 2, and positive electrode tabs 101 of the positive electrode sheet 1 and negative electrode tabs 201 of the composite negative electrode sheet 2 are oppositely arranged along a first direction X, and the positive electrode tabs 101 and the negative electrode tabs 201 are metal conductors for leading out positive and negative electrodes in the battery and are used as contact points during charging and discharging. The material of the solid electrolyte membrane 3 may be a polymer solid electrolyte, an oxide crystalline solid electrolyte, a LiPON-type electrolyte, a sulfide crystalline solid electrolyte, a sulfide glass, a glass ceramic solid electrolyte, or the like, and is not particularly limited herein. For the composite negative electrode sheet 2 including the negative electrode current collector 202 and the negative electrode active material 203 on the front and rear sides of the negative electrode current collector 202, the solid electrolyte membrane 3 is located on the side of the negative electrode active material 203 away from the negative electrode current collector 202.
The first insulating strip 4 and the second insulating strip 5 in this embodiment are disposed on the composite negative electrode sheet 2, and referring to fig. 4, 6 and 7, the first insulating strip 4 is located on one side of the composite negative electrode sheet 2, specifically, one side of the negative electrode tab 201 (opposite side of the positive electrode tab 101), and the second insulating strip 5 is located on two sides of the composite negative electrode sheet 2 along the second direction Y, namely, the second insulating strip 51 and the second insulating strip 52. After the positive plate 1 and the composite negative plate 2 are overlapped, the first insulating strip 4, the second insulating strip 5 and the positive plate 1 are arranged on the same layer, namely the composite negative plate 2 is used as a bearing body of the first insulating strip 4 and the second insulating strip 5. With reference to fig. 5, the second insulating strip 5 is connected with the first insulating strip 4, so that a combined structure of the second insulating strip 5, the first insulating strip 4 and the second insulating strip 5 is formed, and the area of the side wall of the positive plate 1 can be wrapped for the maximization.
In the prior art, a current collector of a positive plate or a negative plate is used as a carrier, and an insulating frame is arranged on the current collector to insulate the side edge of the positive active material or the negative active material, but the current collector is usually made of aluminum or copper, and the aluminum or copper is a conductor and does not insulate the side edge of the current collector, so that the risk of short-circuiting of the positive electrode and the negative electrode is also present. In the invention, two opposite outer side walls of the positive plate 1 along the second direction Y are insulated, namely, not only the side edge of the positive active material 103 is insulated, but also the side edge of the positive current collector 102 is insulated, so that the problem of short circuit between the positive electrode and the negative electrode can be obviously solved.
For the third insulating strip 6, the third insulating strip 6 is disposed at the root of the positive electrode tab 101, and the positive electrode current collector 102 is used as a carrier of the third insulating strip 6 to prevent the root of the positive electrode tab 101 from being shorted with the composite negative electrode sheet 2.
According to the invention, the composite negative plate 2 is used as a supporting body, the first insulating strip 4 and the second insulating strip 5 are arranged on the composite negative plate 2, the side wall of the opposite side of the positive electrode lug 101 of the positive plate 1 is wrapped by the first insulating strip 4, so that the positive and negative short circuits are prevented from occurring on the opposite side of the positive electrode lug 101 of the positive plate 1, the two opposite side walls of the positive plate 1 along the second direction Y are wrapped by the second insulating strip 5, the short circuits between the two opposite sides of the positive plate 1 along the second direction Y and the composite negative plate 2 are prevented, the third insulating strip 6 is arranged at the root of the positive electrode lug 101, the root of the positive electrode lug 101 and the composite negative plate 2 are prevented from being short-circuited, the first insulating strip 4, the second insulating strip 5 and the third insulating strip 6 are comprehensively arranged, the four side walls of the positive plate 1 are insulated, and the problem of the positive and the negative short circuits in the isostatic pressing process can be prevented in an omnibearing manner.
In some alternative embodiments, with continued reference to fig. 5-7, in the second direction Y, the first insulating strip 4 has a length m, the second insulating strip 5 has a width n, and the composite negative electrode sheet 2 has a width k, where m+2×n=k;
in the first direction X, the length of the second insulating strip 5 is equal to the length of the composite negative plate 2;
in the second direction Y, the width of the third insulating strip 6 is equal to the width of the positive electrode tab 101.
In this embodiment, the length of the second insulating strip 5 is equal to the length of the composite negative electrode sheet 2 along the first direction X, and the sum of the length m of the first insulating strip 4 and the widths n of the two second insulating strips 5 is equal to the width k of the composite negative electrode sheet 2 along the second direction Y, and the second insulating strip 5 is connected with the first insulating strip 4, so that the side wall of the positive electrode sheet 1 can be maximally wrapped.
In addition, along the second direction Y, the width of the third insulating strip 6 is equal to the width of the positive electrode tab 101, so that the root of the positive electrode tab 101 and the composite negative electrode sheet 2 can be prevented from being shorted to the greatest extent.
In some alternative embodiments, with continued reference to fig. 5, the width of the first insulating strips 4 in the first direction X is between 1mm-4 mm.
Alternatively, the width of the first insulating strips 4 may be 1mm, 2mm, 3mm, 4mm in the first direction X.
In the embodiment of the invention, the first insulating strip 4 wraps the side wall of the opposite side of the positive electrode tab 101 of the positive electrode sheet 1. It will be appreciated that if the width of the first insulating strip 4 along the first direction X is too small, the positive and negative electrode short circuits will not be sufficiently prevented during the isostatic pressing process, but if the width of the first insulating strip 4 along the first direction X is too large, the first insulating strip 4 wraps the outer side wall of the positive electrode sheet 1, so that the space of the positive electrode sheet 1 (on the opposite side of the positive electrode tab 101 of the positive electrode sheet 1) will be occupied, and if the width of the first insulating strip 4 is too large, the area of the positive electrode sheet 1 will be reduced, thereby affecting the energy density of the lithium battery. In this embodiment, along the first direction X, the width of the first insulating strip 4 is between 1mm and 4mm, which can not only prevent the positive and negative electrode from being shorted, but also not occupy too much space to ensure the energy density of the lithium battery.
In some alternative embodiments, with continued reference to FIG. 5,1 mm≤n≤4 mm.
Alternatively, n may be 1mm, 2mm, 3mm, 4mm.
In the embodiment of the invention, the second insulating strips 5 wrap the side walls of the two side edges of the positive plate 1 along the first direction X. It will be appreciated that the width of the second insulating strip 5 in the second direction Y is too small, which may not be sufficient to prevent shorting of the positive and negative electrodes during isostatic pressing, but if the width of the second insulating strip 5 in the second direction Y is too large, the second insulating strip 5 wraps the outer side wall of the positive electrode sheet 1, so that the space of the positive electrode sheet 1 (opposite sides of the positive electrode sheet 1 in the second direction Y) is occupied, and if the width of the second insulating strip 5 is too large, the area of the positive electrode sheet 1 is reduced, thereby affecting the energy density of the lithium battery. In this embodiment, along the second direction Y, the width n of the second insulating strip 5 is between 1mm and 4mm, which not only can prevent the positive and negative poles from being shorted, but also can not occupy too much space to ensure the energy density of the lithium battery.
In some alternative embodiments, with continued reference to FIG. 5, the third insulating strip 6 has a width A and the positive tab 101 has a width B in the first direction X, 1/5 B≤A≤1/4B.
It will be appreciated that the positive electrode tab 101 is configured to be electrically connected to an external circuit, so that the width of the third insulating strip 6 along the first aspect cannot be too large, which would affect the electrical connection of the positive electrode tab 101 to the external circuit, and of course, the width of the third insulating strip 6 along the first direction X cannot be too small, which is insufficient to prevent shorting of the positive and negative electrodes. In this embodiment, along the first direction X, the width of the third insulating strip 6 is a, the width of the positive electrode tab 101 is B,1/5B is less than or equal to a and less than or equal to 1/4B, which can not only prevent the positive electrode tab 101 from being electrically connected with an external circuit, but also prevent the root of the positive electrode tab 101 from being bent and short-circuited with the composite negative electrode sheet 2.
In some alternative embodiments, with continued reference to fig. 6 and 7, the thickness of the first insulating strip 4, and the thickness of the second insulating strip 5, in the thickness direction Z of the all-solid battery, are equal to the thickness of the positive electrode sheet 1.
It is understood that the thickness of the first insulating strip 4 may be equal to the thickness of the second insulating strip 5, equal to the thickness of the positive electrode sheet 1, in the thickness direction Z of the all-solid battery, where the thickness of the positive electrode sheet 1 refers to the sum of the thicknesses of the positive electrode current collector 102 and the positive electrode active material 103.
Along the direction Z of the thickness of the all-solid-state battery, the thickness of the first insulating strip 4 and the thickness of the second insulating strip 5 are not smaller than the thickness of the positive plate 1, so that the first insulating strip 4 and the second insulating strip 5 can be ensured to completely wrap the outer side wall of the positive plate 1 in the thickness direction in the isostatic pressing process, and the positive and negative insulation is realized. In this embodiment, along the thickness direction Z of the all-solid-state battery, the first insulating strip 4 and the second insulating strip 5 are equal to the thickness of the positive electrode sheet 1, so that the first insulating strip 4 and the second insulating strip 5 can be ensured to completely wrap the outer side wall of the positive electrode sheet 1 in the thickness direction.
Optionally, the thicknesses of the first insulating strip 4 and the second insulating strip 5 may be slightly larger than the thicknesses of the positive electrode sheet 1 along the thickness direction of the solid-state battery, for example, the thicknesses of the first insulating strip 4 and the second insulating strip 5 are larger than 0.1mm-0.3mm along the thickness direction of the solid-state battery, optionally, the thicknesses of the first insulating strip 4 and the second insulating strip 5 are larger than 0.1mm, 0.2mm and 0.3mm along the thickness direction of the positive electrode sheet 1, the materials of the first insulating strip 4 and the second insulating strip 5 are formed by curing insulating glue, and have a certain elasticity, and the thicknesses of the materials of the first insulating strip 4 and the second insulating strip 5 are kept consistent with the thicknesses of the positive electrode sheet 1 in the isostatic pressing process, so that the first insulating strip 4 and the second insulating strip 5 can also be ensured to completely wrap the outer side walls of the positive electrode sheet 1 along the thickness direction of the solid-state battery, thereby realizing positive and negative electrode insulation.
In some alternative embodiments, the material of the first, second, and third insulating strips 4, 5, 6 comprises one of a hot melt adhesive, a UV curable adhesive, a ceramic adhesive, or a silicone adhesive.
Alternatively, the materials of the first insulating strip 4, the second insulating strip 5 and the third insulating strip 6 may be the same or different.
Specifically, the hot melt adhesive is an adhesive material which is solidified after being heated, melted and cooled, has the advantages of adhesiveness, sealing property and durability, is convenient to operate, has low cost and can provide enough insulating property.
The UV curing adhesive is an adhesive which is cured rapidly by ultraviolet irradiation, and has the advantages of rapid curing, high strength, high transparency, good chemical resistance and the like. The curing speed is high, and the method is suitable for mass production; the insulating performance is excellent; high temperature and high humidity resistance, suitability for severe environment, low shrinkage rate and good flexibility, and can adapt to the thermal expansion of the battery.
Ceramic glue generally refers to an adhesive containing ceramic components and has excellent high temperature resistance, insulation and chemical stability. The high-temperature resistance of the composite material is good, the device is suitable for a high-temperature working environment; excellent insulating property, high voltage tolerance, high chemical stability and corrosion resistance.
Silica gel is an elastomer material based on polysiloxane, and has excellent insulation properties, temperature resistance (-50 ℃ to 200 ℃), weather resistance and chemical stability. The insulating material has the advantages of excellent insulating property, high volume resistivity, high dielectric strength, wide temperature resistant range, suitability for extreme environments, good flexibility, capability of adapting to thermal expansion of batteries, chemical corrosion resistance and long service life.
In this embodiment, the insulation of the outer side wall of the positive electrode sheet 1 can be ensured by the hot melt adhesive, the UV curable adhesive, the ceramic adhesive or the silica gel, thereby improving the qualification rate of the solid-state battery.
In some alternative embodiments, with continued reference to fig. 6, positive electrode tab 1 includes a positive electrode current collector 102 and a positive electrode active material 103 located on a side of positive electrode current collector 102 adjacent to composite negative electrode tab 2, positive electrode tab 101 being formed by extension of positive electrode current collector 102;
The thickness of the third insulating strip 6 in the thickness direction Z of the all-solid battery is equal to the thickness of the positive electrode active material 103.
The positive electrode current collector 102 can be aluminum foil, and the aluminum has better stability under the high potential of the positive electrode (generally more than 3.5V vs. Li +/Li), and a compact oxide film formed on the surface of the aluminum can effectively prevent further corrosion. Of course, the aluminum foil is soft, the requirement of the battery pole piece winding process on flexibility can be met, the resources are rich, the cost is low, in addition, the density of the aluminum is low, and the energy density of the battery is improved. The positive electrode tab 101 extends from the positive electrode current collector 102, whereby it is possible to ensure that a current is connected to an external circuit through the positive electrode tab 101.
The positive electrode active material 103 may include a ternary material, a conductive agent, a sulfide electrolyte, a binder, and the like. Wherein, the ternary material realizes high specific capacity (more than 200 mAh/g) and structural stability through the synergistic effect of nickel, cobalt and manganese (or aluminum), for example, NCM811 (nickel content 80%) can significantly improve energy density. The conductive agent is used as an auxiliary material, and can be carbon black, carbon nano tube or graphene, and the electron transmission efficiency of the active material is improved by constructing a conductive network. Sulfide electrolytes (such as Li 10GeP2S12) are solid-state battery electrolysis for isolating the positive and negative electrodes and conducting lithium ions, which are in contact with the positive electrode active material 103 through an interfacial layer, rather than being the active material itself, and chemical stability and electrochemical window of the sulfide electrolyte are key factors for limiting the performance of the solid-state battery. Binders (e.g., PVDF, CMC + SBR) physically bind the active material, conductive agent, and current collector, ensuring the structural integrity of the electrode.
It can be understood that in this embodiment, the positive current collector 102 of the positive electrode sheet 1 itself is used as a carrier of the third insulating strip 6, that is, the insulating glue is directly coated on the positive current collector 102, and the third insulating strip 6 is cured, because the positive current collector 102 is further coated with the positive electrode active material 103, when the third insulating strip 6 and the positive electrode active material 103 are in the same layer, the thickness of the third insulating strip 6 is not less than the thickness of the positive electrode active material 103 along the thickness direction Z of the all-solid-state battery, so that the position of the positive electrode active material 103 corresponding to the positive electrode tab 101 can be wrapped, the root of the positive electrode tab 101 is prevented from being shorted with the composite negative electrode sheet 2 when the root of the positive electrode tab 101 is bent, and the positive electrode active material 103 is also prevented from being shorted with the composite negative electrode sheet 2.
Based on the same inventive concept, with continued reference to fig. 1 to 7 and with reference to fig. 8 and 9, the present invention also provides a method for manufacturing an all-solid-state battery 100, comprising the steps of:
S101, providing a positive plate substrate, coating insulating glue on two sides of the corresponding positive plate substrate to cure to form a third insulating strip 6, wherein the coating position is a first distance from the edge of the positive plate substrate, and die-cutting the positive plate substrate to form a positive plate 1, so that the third insulating strip 6 is positioned at the root of a positive lug 101 of the positive plate 1;
s102, providing a composite negative plate matrix, wherein one side of the composite negative plate matrix, which is attached to the positive plate 1, comprises a solid electrolyte membrane 3, and performing die cutting on the composite negative plate matrix to form a composite negative plate 2;
S103, stacking, namely stacking the positive plate 1 on one side of the composite negative plate 2, wherein the positive electrode tab 101 of the positive plate 1 is opposite to the negative electrode tab 201 of the composite negative plate 2 along a first direction X, and aligning one side of the positive plate 1, on which a third insulating strip 6 is arranged, with the opposite side of the negative electrode tab 201 of the composite negative plate 2;
S104, forming a first insulating strip 4 and a second insulating strip 5, wherein the steps comprise the steps of coating insulating glue in a first reserved distance on the composite negative plate 2 to form the first insulating strip 4, and coating insulating glue in a second reserved distance on the composite negative plate 2 to form the second insulating strip 5, so that the first insulating strip 4 and the second insulating strip 5 wrap the outer side wall of the positive plate 1 to form a unit lamination;
S105, stacking the unit lamination.
Specifically, referring to fig. 9, for step S101, a positive plate substrate is provided, insulating glue 60 is coated on the front and back surfaces of the corresponding positive plate substrate to cure to form a third insulating strip 6, the coated position has a first distance from the edge of the positive plate substrate, and the positive plate substrate is die-cut to form a positive plate 1, so that the third insulating strip 6 is located at the root of a positive tab 101 of the positive plate 1, and meanwhile, the die-cutting process will form the positive tab 101. Optionally, referring to fig. 9, during die cutting, a third insulating strip 6 with a certain width may be reserved in addition to the position of the positive electrode tab 101, so that the positive electrode sheet 1 can be further insulated.
Alternatively, in the process of coating the positive electrode active material 103 on the positive electrode current collector 102, the insulating paste 60 may be coated first and then the positive electrode active material 103 may be coated, or the positive electrode active material 103 may be coated first and then the insulating paste 60 may be coated, which is not particularly limited herein.
For step S102, a composite negative plate substrate is provided, the composite negative plate 2 includes a solid electrolyte membrane 3, in this embodiment, both the front and the back of the composite negative plate 2 are provided, the composite negative plate substrate is die-cut to form the composite negative plate 2, and the die-cutting process will form the negative tab 201.
For step S103, the positive electrode sheet 1 and the composite negative electrode sheet 2 are stacked, the area of the composite negative electrode sheet 2 is larger than that of the positive electrode sheet 1, and a first reserved distance and a second reserved distance need to be reserved during stacking for setting the first insulating strip 4 and the second insulating strip 5 on the composite negative electrode sheet 2 later. The method comprises the steps of firstly aligning one side of the positive plate 1, on which the third insulating strip 6 is arranged, with the opposite side of the negative electrode tab 201 of the composite negative electrode plate 2, then ensuring that a first reserved distance exists between the edge of the opposite side of the positive electrode tab 101 in the positive plate 1 and the edge of the side, close to the negative electrode tab 201, of the composite negative electrode plate 2 along the first direction X, and ensuring that a second reserved distance exists between the edge of the positive plate 1 and the edge of the composite negative electrode plate 2 along the second direction Y.
For step S104, after the positive electrode sheet 1 and the composite negative electrode sheet 2 are stacked, an insulating adhesive may be coated on the composite negative electrode sheet 2, a first insulating strip 4 is formed at a position corresponding to the first preset distance, and a second insulating strip 5 is formed at a position corresponding to the second preset distance, so that the first insulating strip 4 and the second insulating strip 5 are on the same layer as the positive electrode sheet 1 and insulate the outer side wall of the positive electrode sheet 1.
For S105, a predetermined number of unit laminations are stacked in order according to production requirements.
According to the invention, the composite negative plate 2 is used as a supporting body, the first insulating strip 4 and the second insulating strip 5 are formed on the composite negative plate 2, the side wall of the opposite side of the positive electrode lug 101 of the positive plate 1 is wrapped by the first insulating strip 4, so that the positive and negative short circuits on the opposite side of the positive electrode lug 101 of the positive plate 1 are prevented, the two side walls of the positive plate 1 opposite along the second direction Y are wrapped by the second insulating strip 5, the short circuits on the two opposite sides of the positive plate 1 along the second direction Y and the composite negative plate 2 are prevented, in addition, the positive current collector 102 is used as a supporting body, the third insulating strip 6 is formed at the root of the positive electrode lug 101, the root of the positive electrode lug 101 and the composite negative plate 2 are prevented, and the first insulating strip 4, the second insulating strip 5 and the third insulating strip 6 are comprehensively arranged, so that the problem of the positive and negative short circuits in the isostatic pressing process can be further prevented.
In some alternative embodiments, the profile of the positive electrode tab 1 is detected online, so that in the first direction X, the edge of the positive electrode tab 1 on the opposite side of the positive electrode tab 101 has a first predetermined distance from the edge of the composite negative electrode tab 2 on the side close to the negative electrode tab 201, and in the second direction Y, the edge of the positive electrode tab 1 has a second predetermined distance from the edge of the composite negative electrode tab 2.
In the embodiment of the invention, a high-speed visual technology can be adopted to detect the position of the positive plate 1, so that the first reserved distance between the edge of the opposite side of the positive electrode tab 101 in the positive plate 1 and the edge of the side, close to the negative electrode tab 201, of the composite negative plate 2 in the first direction X is ensured, and the second reserved distance between the edge of the positive plate 1 and the edge of the composite negative plate 2 in the second direction Y is ensured.
Optionally, 200 ten thousand high-speed cameras are correspondingly arranged on three sides (the side of the negative electrode tab 201 and two sides along the second direction Y) of the corresponding composite negative electrode plate 2 respectively, photographing is carried out to detect the outer contour of the positive electrode plate 1, the visual field can be 34mm multiplied by 17mm, and the resolution of the camera can reach 0.017mm/pix. Of course, the performance parameters of the high-speed camera are not particularly limited here, as long as the outer contour of the positive electrode sheet 1 can be detected on line.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. The all-solid-state battery is characterized by comprising a positive plate and a composite negative plate which are arranged in a laminated way, wherein one side of the composite negative plate, which is attached to the positive plate, comprises a solid electrolyte membrane, a positive electrode tab of the positive plate and a negative electrode tab of the composite negative plate are arranged oppositely along a first direction,
The periphery of one side of the composite negative electrode plate, which is close to the positive electrode plate, comprises a first insulating strip and a second insulating strip, wherein the first insulating strip is positioned on one side of the composite negative electrode plate, which is opposite to the positive electrode lug, the second insulating strip is oppositely arranged along a second direction, the second insulating strip is connected with the first insulating strip, the second direction is vertically intersected with the first direction, and the first insulating strip and the second insulating strip wrap the outer side wall of the positive electrode plate;
and one side, close to the composite negative plate, of the root of the positive electrode tab comprises a third insulating strip, and the width of the third insulating strip is smaller than that of the positive electrode tab along the first direction.
2. The all-solid battery according to claim 1, wherein in the second direction, the length of the first insulating strip is m, the width of the second insulating strip is n, and the width of the composite negative electrode sheet is k, wherein m+2×n=k;
along the first direction, the length of the second insulating strip is equal to the length of the composite negative plate;
and along the second direction, the width of the third insulating strip is equal to the width of the positive electrode lug.
3. The all-solid battery of claim 1, wherein the width of the first insulating strip in the first direction is between 1mm-4 mm.
4. The all-solid battery according to claim 2, wherein 1 mm≤n≤4 mm.
5. The all-solid battery according to claim 1, wherein the width of the third insulating bar is a and the width of the positive electrode tab is B,1/5 b≤a≤1/4B in the first direction.
6. The all-solid battery according to claim 1, wherein the thickness of the first insulating strip and the thickness of the second insulating strip are equal to the thickness of the positive electrode sheet in the thickness direction of the all-solid battery.
7. The all-solid battery of claim 1, wherein the material of the first, second, and third insulating strips comprises one of a hot melt adhesive, a UV curable adhesive, a ceramic adhesive, or a silicone adhesive.
8. The all-solid battery according to claim 1, wherein the positive electrode tab includes a positive electrode current collector and a positive electrode active material located on a side of the positive electrode current collector adjacent to the composite negative electrode tab, the positive electrode tab being formed by extension of the positive electrode current collector;
The thickness of the third insulating strip is equal to the thickness of the positive electrode active material in the thickness direction of the all-solid battery.
9. A method of manufacturing an all-solid-state battery, comprising the steps of forming a cell stack:
Providing a positive plate substrate, coating insulating glue on two sides of the positive plate substrate correspondingly to form a third insulating strip, and carrying out die cutting on the positive plate substrate to form a positive plate, wherein the coating position is a first distance from the edge of the positive plate substrate, so that the third insulating strip is positioned at the root part of a positive electrode lug of the positive plate;
providing a composite negative plate substrate, wherein one side, attached to the positive plate, of the composite negative plate substrate comprises a solid electrolyte membrane, and die cutting is carried out on the composite negative plate substrate to form a composite negative plate;
stacking, namely stacking the positive plate on one side of the composite negative plate, wherein a positive electrode tab of the positive plate is opposite to a negative electrode tab of the composite negative plate along a first direction, and aligning one side of the positive plate, on which the third insulating strip is arranged, with the opposite side of the negative electrode tab of the composite negative plate; the edge of the opposite side of the positive electrode tab in the positive electrode sheet and the edge of the side, close to the negative electrode tab, of the composite negative electrode sheet are provided with a first reserved distance along the first direction;
The method comprises the steps of coating insulating glue in a first reserved distance on the composite negative plate to form a first insulating strip, and coating insulating glue in a second reserved distance on the composite negative plate to form a second insulating strip, so that the first insulating strip and the second insulating strip wrap the outer side wall of the positive plate to form a unit lamination;
And a step of stacking the unit laminations.
10. The method according to claim 9, wherein the contour of the positive electrode sheet is detected on line such that the edge of the positive electrode sheet on the opposite side of the positive electrode tab has a first predetermined distance from the edge of the composite negative electrode sheet on the side close to the negative electrode tab in the first direction, and the edge of the positive electrode sheet has a second predetermined distance from the edge of the composite negative electrode sheet in the second direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510896536.4A CN120978165A (en) | 2025-06-30 | 2025-06-30 | An all-solid-state battery and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510896536.4A CN120978165A (en) | 2025-06-30 | 2025-06-30 | An all-solid-state battery and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN120978165A true CN120978165A (en) | 2025-11-18 |
Family
ID=97644063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510896536.4A Pending CN120978165A (en) | 2025-06-30 | 2025-06-30 | An all-solid-state battery and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN120978165A (en) |
-
2025
- 2025-06-30 CN CN202510896536.4A patent/CN120978165A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101971407B (en) | Solid-state battery manufacturing method and solid state battery | |
| CN102150300B (en) | Electrode body, all-solid battery element, and all-solid battery | |
| US20200185780A1 (en) | Solid state battery fabrication | |
| KR100742109B1 (en) | Nonaqueous-electrolyte secondary battery and method of manufacturing the same | |
| JP5382130B2 (en) | Method for producing solid electrolyte battery | |
| CN103548196B (en) | bipolar all-solid-state battery | |
| JP4144312B2 (en) | Bipolar battery | |
| CN103003992B (en) | Current collector and manufacturing method thereof, battery and manufacturing method thereof | |
| KR20000066416A (en) | lithum polymer battery and manufacturing method thereof | |
| JP2011204510A (en) | All solid lithium ion secondary battery | |
| US20210020994A1 (en) | Battery and battery manufacturing method | |
| JP6579694B2 (en) | Secondary battery | |
| CN121011615A (en) | Positive electrode for solid-state batteries, manufacturing method of positive electrode for solid-state batteries, and solid-state batteries. | |
| CN115411347A (en) | Energy storage device | |
| EP3490051B1 (en) | Electrode assembly comprising electrode lead coupled to long-side area | |
| WO2022170451A1 (en) | Cell and electronic device using same | |
| KR101089161B1 (en) | Pouch Type Secondary Battery | |
| JP2000138057A (en) | Solid electrolyte battery and method of manufacturing the same | |
| CN1257320A (en) | Lithium polymer cell | |
| CN120978165A (en) | An all-solid-state battery and its manufacturing method | |
| JP5008960B2 (en) | All-solid-state lithium secondary battery manufacturing method and all-solid-state lithium secondary battery | |
| CN116759655B (en) | Preparation process of laminated battery cell, laminated battery cell and battery | |
| CN120978155A (en) | A solid-state battery and its manufacturing method | |
| CN219226344U (en) | battery module | |
| CN219123266U (en) | Battery cell and battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |