Solid-state battery insulation support and solid-state battery

Abstract

The application discloses a solid-state battery insulation support and a solid-state battery, and relates to the technical field of solid-state batteries.The insulation support comprises a solid-state base film and a glue layer coated on the surface of the base film, the thickness of the insulation support is provided by the solid-state base film, the solid-state base film does not need to be cured by high-temperature glue solution, the existence of the thick solid-state base film reduces the thickness of the glue layer with a bonding effect, and effectively avoids the glue from being squeezed into the gap between the electrode and the electrolyte.The insulation support provided by the application solves the edge contact short circuit problem caused by deformation of the edge position of the battery cell during the pressing process;the gap of the edge overhanging area is filled, a skeleton effect is achieved, the rigidity of the edge area of the battery cell is improved, and the problems of breakage and material falling off of the edge area of the battery cell are reduced;the double-sided glue layer is used for bonding the electrode sheet of the battery cell, a key positioning and shaping effect is achieved in the processes of lamination and transfer, and the position movement of the electrode sheet of the battery cell is avoided.

Description

Technical Field

[0001] This invention relates to the field of solid-state battery technology, and more specifically, to a solid-state battery insulating support and a solid-state battery. Background Technology

[0002] In the development of all-solid-state lithium-ion batteries, replacing traditional liquid electrolytes with solid electrolytes has become an important research direction. This electrolyte layer not only performs ion conduction but also acts as an electronic separator. However, for ceramic-type solid electrolytes, the edge areas are susceptible to mechanical stress during cell assembly, leading to electrolyte layer cracking and peeling, which in turn causes short circuits between the positive and negative electrodes, or between the tabs and the opposite electrode. To address this issue, existing technologies typically use organic colloids such as hot-melt, thermoplastic, or thermosetting resins to insulate the edges of the positive and negative electrodes. However, these methods still face multiple challenges in practical applications: First, high-temperature adhesives are prone to side reactions with sulfides, halides, and other solid electrolytes, causing battery capacity decay, reduced cycle performance, and even internal short circuits, severely affecting battery reliability. Second, in some practical all-solid-state batteries, the thickness difference between the positive and negative electrodes is significant, with the overhang region at the cell edge reaching 0.2–0.4 mm in thickness, requiring a thicker adhesive layer. During the coating process, the adhesive tends to seep through the gap between the electrode layer and the electrolyte layer. Especially under the high-pressure conditions of the subsequent pressing process, the adhesive is more likely to penetrate the electrode-electrolyte interface, hindering ion transport paths and inducing defects such as battery performance degradation, lithium plating, and even internal short circuits. Furthermore, the long curing time required for the adhesive severely restricts production cycle time and overall efficiency. The pressing process cannot be carried out before the adhesive is fully cured; otherwise, the gel-state adhesive will be squeezed into the electrode gaps, further exacerbating interface isolation and the risk of battery failure. Therefore, existing coating insulation solutions have significant shortcomings in terms of material compatibility, process control, and production efficiency, necessitating the development of novel edge insulation technologies and processes.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] This invention provides a solid-state battery insulating support and a solid-state battery. The composite insulating support uses a solid base film and an ultra-thin adhesive layer, eliminating the need for a high-temperature adhesive curing stage. The base film has adhesive layers on both sides, but no adhesive layer at the edges, facilitating handling and placement during cell stacking. This insulating support can be fed in roll form and die-cut into a frame structure, which is then stacked on top of the electrolyte layer during cell padding.

[0005] This invention is implemented as follows:

[0006] In a first aspect, the present invention provides a solid battery insulating support, the insulating support comprising a solid base film and an adhesive layer coated on the surface of the base film;

[0007] The solid substrate membrane is a solid organic polymer membrane or an inorganic metal membrane;

[0008] The adhesive layer is formed by dissolving a polymeric resin in a low-polarity solvent or a non-reactive solvent, and the viscosity of the adhesive layer is 5000-20000 mPa·s.

[0009] In some preferred embodiments, the solid organic polymer film is selected from at least one of polyethylene terephthalate, polypropylene, polyimide, polyvinylidene fluoride, polyvinyl chloride, polyetheretherketone, and polyphenylene sulfide;

[0010] And / or, the inorganic metal film is selected from at least one of pure metals such as iron, copper, aluminum, and nickel or their alloys.

[0011] In some preferred embodiments, the polymer resin is selected from at least one of epoxy resin, silicone resin, polyurethane, acrylate, alkane resin, olefin resin, benzene resin or nitrile resin;

[0012] And / or, the low-polarity solvent or inactive solvent is selected from at least one of alkane solvents, cyclic ether solvents, ester solvents or benzene solvents.

[0013] In some preferred embodiments, the thickness of the adhesive layer is between 0.1 and 10 μm, and the width of the adhesive layer is smaller than the width of the solid base film.

[0014] In some preferred embodiments, the total thickness of the insulating support is the same as the thickness of the cell electrode sheet.

[0015] Secondly, the present invention provides an assembly method for a solid-state battery insulating support, the steps of which include: feeding a roll of material, die-cutting it into a support frame structure with side wings on both sides using a die-cutting device, grabbing the side wings of the support frame structure using a robotic arm gripping device and stacking them on an electrolyte negative electrode composite, then grabbing a positive electrode sheet and stacking it inside the support frame structure, grabbing the support frame again and stacking it on the outside of the positive electrode, grabbing the electrolyte negative electrode composite and stacking it on the support frame, repeating the above process until a predetermined number of stacked layers are completed, applying a preset pressure to the battery cell using a press after the stacking is completed, and then cutting off the side wings of the insulating support to complete the assembly of the insulating support.

[0016] In some preferred embodiments, the die-cutting equipment is a mechanical die-cutting equipment or a laser die-cutting equipment.

[0017] In some preferred embodiments, the robotic arm gripping device is a suction cup type or a gripper type.

[0018] In some preferred embodiments, the preset pressure ranges from 0.5 to 10 tons.

[0019] Thirdly, the present invention provides a solid-state battery, the battery comprising: a positive electrode, a negative electrode-electrolyte composite, and the aforementioned insulating support;

[0020] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer;

[0021] The insulating support is disposed between the positive electrode and the negative electrode-electrolyte composite, and wraps around the edge of the positive electrode;

[0022] The insulating support contacts and supports the edge overhanging area of ​​the negative electrode-electrolyte complex.

[0023] The present invention has the following beneficial effects:

[0024] (1) The present invention provides a composite insulating support using a solid base film + an ultra-thin adhesive layer, which does not require high-temperature adhesive curing, avoids the contact reaction between high-temperature organic matter and electrolyte, and ensures that the electrochemical performance of the battery cell is not affected. The thickness of the support is provided by the solid base film, which effectively avoids the adhesive being squeezed into the gap between the electrode and the electrolyte. There is no adhesive curing process, and the generation efficiency is high.

[0025] (2) This invention solves the problem of edge contact short circuits caused by electrode deformation during high-pressure pressing of the battery cell edge by using a solid-state battery insulator; it fills the gaps in the edge overhang area, acting as a skeleton to improve the rigidity of the battery cell edge area and reduce problems such as cracking and material loss in the battery cell edge area; the double-sided adhesive layer bonds the battery cell electrode sheets, playing a key positioning and shaping role in the stacking and transfer processes, preventing the battery cell electrode sheets from moving. Furthermore, it has excellent process feasibility, employing a "roll-die-cutting-stacking" insulating support forming and assembly process, which features high precision and high efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the insulating support structure in an embodiment of this application;

[0028] Figure 2This is an exploded structural diagram of the solid-state battery laminate assembly and the insulating support in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the assembly structure of the solid-state battery insulation support frame in an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the cell structure using an insulating support in the embodiments of this application;

[0031] Figure 5 This is a schematic diagram of the assembly process of the insulating support in the embodiments of this application. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0033] The following is a detailed description of a solid-state battery insulating support and a solid-state battery provided by the present invention.

[0034] In a first aspect, the present invention provides a solid-state battery insulating support, the insulating support comprising a solid base film and an adhesive layer coated on the surface of the base film, such as... Figure 1 As shown;

[0035] The solid substrate membrane is a solid organic polymer membrane or an inorganic metal membrane;

[0036] In some preferred embodiments, the solid organic polymer film is selected from at least one of polyethylene terephthalate, polypropylene, polyimide, polyvinylidene fluoride, polyvinyl chloride, polyetheretherketone, and polyphenylene sulfide;

[0037] And / or, the inorganic metal film is selected from at least one of pure metals such as iron, copper, aluminum, and nickel or their alloys.

[0038] Based on the separate design of the substrate and adhesive layer of the support in this invention, the substrate does not need to act as an adhesive, which greatly expands the range of materials that can be selected. Higher rigidity and strength organic composite plastics, rubbers, and even metals can be used, significantly enhancing the support structure's ability to support the edges of the battery cell. Furthermore, the substrate of the support is a solid film, eliminating the need for high-temperature melting and curing processes, thus avoiding the reaction problems between high-temperature liquid organic materials and the electrolyte layer.

[0039] The adhesive layer is formed by dissolving a polymeric resin in a low-polarity solvent or a non-reactive solvent, and the viscosity of the adhesive layer is 5000-20000 mPa·s.

[0040] In some preferred embodiments, the polymer resin is selected from at least one of epoxy resin, silicone resin, polyurethane, acrylate, alkane resin, olefin resin, benzene resin or nitrile resin;

[0041] And / or, the low-polarity solvent or inactive solvent is selected from at least one of alkane solvents, cyclic ether solvents, ester solvents or benzene solvents.

[0042] In some preferred embodiments, the adhesive layer thickness is between 0.1-10 μm, and the width of the adhesive layer is smaller than the width of the solid base film, i.e., there is no adhesive layer at the edges, which facilitates gripping and placement during the assembly process. Furthermore, the thickness of the insulating support is provided by the solid base film; the presence of a thick solid base film reduces the thickness of the adhesive layer that provides adhesion, effectively preventing the adhesive from being squeezed into the gap between the electrode and the electrolyte.

[0043] Therefore, this invention employs a composite insulating support consisting of a solid base film and an ultra-thin adhesive layer. It eliminates the need for a high-temperature adhesive curing stage, avoiding contact reactions between high-temperature organic matter and the electrolyte, thus preserving the electrochemical performance of the battery cell. With no adhesive curing process, it is ready to use immediately, resulting in high production efficiency and making it a highly practical process solution.

[0044] Secondly, the present invention provides an assembly method for a solid-state battery insulating support, such as... Figure 5 As shown, the steps include:

[0045] S1. Roll material is used for feeding and die-cut into a support frame structure with side wings on both sides using a die-cutting equipment.

[0046] In some preferred embodiments, the die-cutting equipment is a mechanical die-cutting equipment or a laser die-cutting equipment.

[0047] S2. The robotic arm gripping device grabs the two side wings of the support frame structure and stacks them on the electrolyte negative electrode composite.

[0048] In some preferred embodiments, the robotic arm gripping device is a suction cup type or a gripper type.

[0049] It should be noted that the robotic arm gripping device is a combination of a robotic arm and a gripper or a washing plate, located on both sides of the zhuaq area.

[0050] S3. Then grab the positive electrode sheet and stack it into the support frame structure.

[0051] In some embodiments of this application, the positive electrode sheet is composed of a positive photometer and a positive current collector; the thickness of the support body is the same as the thickness of the positive electrode sheet.

[0052] The insulating support acts as a frame structure to wrap around the edge of the positive electrode, protecting and isolating it.

[0053] S4. Grab the support frame again and stack it on the outside of the positive electrode. Grab the electrolyte negative electrode complex and stack it on the support frame.

[0054] In addition to protecting the edge of the positive electrode, the insulating support also supports the hanging area at the edge of the negative electrode-electrolyte complex, preventing this area from collapsing and cracking during subsequent high-pressure compaction.

[0055] S5. Repeat the above process until the predetermined number of stacked layers is completed.

[0056] S6. After lamination, a press is used to apply a preset pressure to the cell, and then the side wings of the insulation support are cut off to complete the assembly of the insulation support. The structure of the insulation support stacked into the cell is as follows. Figure 2 , 3 As shown in Figure 4.

[0057] In some preferred embodiments, the preset pressure ranges from 0.5 to 10 tons, which causes the cell electrode sheets and the insulating support to adhere tightly together.

[0058] Thirdly, the present invention provides a solid-state battery, the battery comprising: a positive electrode, a negative electrode-electrolyte composite, and the aforementioned insulating support;

[0059] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer;

[0060] The insulating support frame is disposed between the positive electrode and the negative electrode-electrolyte composite, and wraps around the edge of the positive electrode;

[0061] The insulating support frame contacts and supports the edge overhang area of ​​the negative electrode-electrolyte composite.

[0062] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0063] Example 1

[0064] This embodiment provides an insulating support frame, comprising: a 150 μm thick PET film as the base film material; a styrene-butadiene rubber mixed with 5% nano-alumina particles as filler, with a particle size D50 of 20 nm as the adhesive layer, a viscosity of up to 30000 mPa·s, a thickness of 5 μm, a width of 104.5 mm, and a distance of 20 mm from the outer edge of the adhesive layer to the outer edge of the support frame. The die-cut support frame has an adhesive layer width of 2 mm, a cell suspension area width of 1.5 mm, a positive electrode size of 250 mm × 100 mm × 300 μm, and a negative electrode electrolyte composite electrode size of 253 mm × 103 mm × 50 μm. The positive electrode current collector is made of aluminum foil with a thickness of 10 μm, and the negative electrode current collector is made of copper foil with a thickness of 8 μm.

[0065] A method for assembling an insulating support frame is also provided, comprising the following steps: the insulating support is prepared into a roll, and then die-cut into a support frame structure with side wings on both sides by a mechanical die-cutting machine. The inner dimensions of the frame are 250.5 mm × 100.5 mm × 150 μm, the adhesive layer width is 2 mm, the side wing length is 200 mm, and the width is 30 mm. The side wings of the support frame structure are grasped by a robotic arm in conjunction with grippers and stacked on the electrolyte negative electrode composite. Then, the positive electrode sheet is grasped and stacked into the support frame structure. The support frame is grasped again and stacked on the outside of the positive electrode. The electrolyte negative electrode composite is grasped and stacked on the support frame. The above process is repeated until the stacking of 20 layers of cells is completed. After the stacking is completed, a press is used to apply a pressure of 0.5T to the cells and hold it for 2 seconds to tightly bond the cell electrodes and the insulating support together. Then, the side wings of the insulating support are cut off using a thermal resistance wire to complete the assembly of the insulating support.

[0066] Example 2

[0067] This embodiment provides an insulating support frame, comprising: a PVDF film with a thickness of 200 μm as the base film material; a filler layer consisting of a 1:1 mixture of acrylate and nitrile rubber filled with 5% silica, the filler particle size D50 being 100 nm, the viscosity of the filler layer reaching 10000 mPa·s, the filler layer thickness being 5 μm, the filler layer width being 209 mm, and the distance from the outer edge of the filler layer to the outer edge of the support body being 30 mm. The die-cut support frame has a filler layer width of 4 mm, a cell suspension area width of 2 mm, a positive electrode sheet size of 400 mm × 200 mm × 400 μm, and a negative electrode electrolyte composite electrode sheet size of 404 mm × 204 mm × 80 μm. The positive electrode current collector is made of aluminum foil with a thickness of 10 μm, and the negative electrode current collector is made of copper foil with a thickness of 8 μm.

[0068] A method for assembling an insulating support frame is also provided, comprising the following steps: the insulating support is prepared into a roll, and then die-cut into a support frame structure with side wings on both sides by a mechanical die-cutting machine. The inner dimensions of the frame are 401 mm × 201 mm × 200 μm, the adhesive layer width is 4 mm, and the side wings are 350 mm long and 30 mm wide. The side wings of the support frame structure are grasped by a robotic arm in conjunction with grippers and stacked on the electrolyte negative electrode composite. Then, the positive electrode sheet is grasped and stacked into the support frame structure. The support frame is grasped again and stacked on the outside of the positive electrode. The electrolyte negative electrode composite is grasped and stacked on the support frame. The above process is repeated until the stacking of 20 layers of cells is completed. After the stacking is completed, a press is used to apply a pressure of 1.0T to the cells and hold it for 5 seconds to tightly bond the cell electrodes and the insulating support together. Then, the side wings of the insulating support are cut off using a thermal resistance wire to complete the assembly of the insulating support.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A solid-state battery, characterized in that, The battery includes: a positive electrode, a negative electrode-electrolyte complex, and an insulating support; The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer; The insulating support is disposed between the positive electrode and the negative electrode-electrolyte composite, and wraps around the edge of the positive electrode; The insulating support body contacts and provides support to the edge overhanging area of ​​the negative electrode-electrolyte composite. The insulating support is composed of a solid base film and an adhesive layer coated on the surface of the base film; The solid substrate membrane is a solid organic polymer membrane or an inorganic metal membrane; The adhesive layer is formed by dissolving a polymeric resin in a low-polarity solvent or a non-reactive solvent, and the viscosity of the adhesive layer is 5000-20000 mPa·s. The thickness of the adhesive layer is between 0.1 and 10 μm, and the width of the adhesive layer is smaller than the width of the solid base film; The polymer resin is selected from at least one of epoxy resin, silicone resin, polyurethane, acrylate, alkane resin, olefin resin, benzene resin or nitrile resin; The total thickness of the insulating support is the same as the thickness of the positive electrode sheet, the thickness of the positive electrode sheet is 300μm or 400μm, and the number of insulating supports is 2. The adhesive layer is located between the negative electrode-electrolyte composite and the solid base film, and does not require high-temperature curing of the adhesive solution, thus avoiding the adhesive layer being squeezed into the gap between the electrode and the electrolyte.

2. A solid-state battery according to claim 1, characterized in that, The solid organic polymer membrane is selected from at least one of polyethylene terephthalate, polypropylene, polyimide, polyvinylidene fluoride, polyvinyl chloride, polyetheretherketone, and polyphenylene sulfide. And / or, the inorganic metal film is selected from at least one of pure metals such as iron, copper, aluminum, and nickel or their alloys.

3. A solid-state battery according to claim 1, characterized in that, The low-polarity solvent or inactive solvent is selected from at least one of alkane solvents, cyclic ether solvents, ester solvents, or benzene solvents.

4. A method for assembling a solid-state battery as described in any one of claims 1-3, characterized in that, The steps include: feeding the material into rolls, die-cutting it into an insulating support with side wings on both sides using a die-cutting device, grabbing the side wings of the insulating support with a robotic arm gripping device and stacking them on the negative electrode-electrolyte composite, then grabbing the positive electrode sheet and stacking it inside the insulating support structure, grabbing the insulating support again and stacking it on the outside of the positive electrode sheet, grabbing the negative electrode-electrolyte composite and stacking it on the insulating support, repeating the above process until the predetermined number of stacked layers is completed, applying a preset pressure to the cell using a press after the stacking is completed, and then cutting off the side wings of the insulating support to complete the assembly of the insulating support.

5. The assembly method of a solid-state battery according to claim 4, characterized in that, The die-cutting equipment is either a mechanical die-cutting equipment or a laser die-cutting equipment.

6. The assembly method of a solid-state battery according to claim 4, characterized in that, The robotic arm's gripping device is either a suction cup type or a gripper type.

7. The assembly method of a solid-state battery according to claim 4, characterized in that, The preset pressure ranges from 0.5 to 10 tons.

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