Resin layer for solid state battery with suspended anode
By printing a solid resin bracket around the separator-anode stack of solid-state batteries and setting the cathode in the bracket to compress and form the battery cell, the stress accumulation and crack problems caused by the compacted layer are solved, and the battery performance is improved.
Patent Information
- Application Number
- CN202411779187.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-12
- Filing Date
- 2024-12-05
- Publication Date
- 2025-06-20
AI Technical Summary
In solid-state batteries, the application of compaction layer may cause stress accumulation at the cathode edge, resulting in the formation of cracks and affecting battery performance.
By printing a solid resin bracket around the partition side of the partition-anode stack, and setting the cathode in the bracket in direct contact with the partition side, the solid resin bracket, the partition-anode stack and the cathode are compressed to make the adjacent outer surfaces of the bracket and the cathode flush, thereby forming a compacted lithium-ion battery cell.
This method reduces stress accumulation at the cathode edge by evenly distributing pressure, reduces crack formation, improves interface contact and cohesion of battery cells, and enhances battery performance.
Smart Images
Figure CN120184328A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a cell structure for a lithium-ion battery cell. Background Art
[0002] In a solid-state battery, applying pressure to the constituent layers of the battery can help increase their interlayer contact and conductivity, which can lead to better battery performance. Summary of the Invention
[0003] In one aspect, a solid-state battery includes: a compacted solid-state battery cell including a separator-anode laminate; a plurality of solid resin layers defining a perimeter around a separator side of the separator-anode laminate and extending away from the perimeter as a bracket; and a cathode disposed within the bracket and in direct contact with the separator side such that adjacent outer surfaces of the bracket and the cathode are flush.
[0004] The solid-state battery may further include an electrical tab attached to an anode side of the separator-anode laminate. The separator portion of the separator-anode laminate may be sulfide-based. The anode portion of the separator-anode laminate may be silicon-based. The thickness of the cathode may be less than 40 μm. The elastic modulus of the solid resin layer may be within 10% of the elastic modulus of the cathode.
[0005] In another aspect, a lithium-ion battery includes: a cathode; a separator laminated with an anode; and a solid resin bracket printed on the separator overlapping the anode such that the cathode can be placed inside the solid resin bracket and compressed together with the separator, anode, and solid resin layer to form a battery cell. The battery cell may further include an electrical tab connected to the anode, the electrical tab extending from a side opposite the separator. The solid bracket may have an elastic modulus within 10% of the elastic modulus of the cathode. The solid resin layer may have a thickness greater than the thickness of the cathode or a thickness less than the thickness of the cathode. The solid resin layer may be made of a thermosetting material. The separator may be porous polyethylene-based. In other configurations, the separator may be sulfide-based and the anode may be silicon composite-based.
[0006] In another aspect, a method includes printing a solid resin bracket around a perimeter of a separator side of a separator-anode laminate. Disposing a cathode on the separator side and within the solid resin bracket, and compressing the solid resin bracket, separator-anode laminate, and cathode such that adjacent outer surfaces of the solid resin bracket and the cathode are flush to form a compacted lithium-ion battery cell. In some configurations, at least 400 megapascals (MPa) may be applied during the compression step. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1A is a top view of a mask of the cathode size on an anode according to an embodiment;
[0008] Figure 1B is a top view of a mask of the cathode size on the separator side of a separator-anode laminate according to an embodiment;
[0009] Figure 1C is a top view of a plurality of resin layers on a component according to an embodiment;
[0010] Figure 1D is a top view of a component having a cathode according to an embodiment;
[0011] Figure 1E is along the V-V line according to an embodiment Figure 1D schematic cross-sectional view of the component;
[0012] Figure 1F is along the V-V line after a compression step according to an embodiment Figure 1D schematic cross-sectional view of the compacted component; and
[0013] Figure 2 is a flow chart of an assembly process according to an embodiment. DETAILED DESCRIPTION
[0014] Embodiments are described herein. However, it should be understood that the disclosed embodiments are merely examples and other embodiments may take different and alternative forms. The drawings are not necessarily to scale. Some features may be enlarged or minimized to show details of particular components. Accordingly, the specific structural and functional details disclosed herein should not be construed as limiting, but merely as a representative basis for teaching one of ordinary skill in the art.
[0015] The various features shown and described with reference to any one of the drawings may be combined with features shown in one or more other drawings to produce embodiments not explicitly shown or described. Combinations of the shown features provide representative embodiments for typical applications. However, for a particular application or implementation, various combinations and modifications of the features may be desirable that are consistent with the teachings of this disclosure.
[0016] A solid-state battery in an anode-suspended configuration (where the cathode is smaller in size than the combined separator-anode laminate) may have cracks in the solid-state separator, particularly around the edges of the cathode after pressure is applied. These cracks may be caused by stress accumulation at these points.
[0017] The proposed assembly process includes printing a solid resin around the cathode. This step aims to distribute pressure more evenly during the compression phase. By selecting a resin with properties similar to the cathode, such as elastic modulus, the edges of the cathode are less likely to become the main pressure points, which can help reduce the formation of cracks. Even if the resin is not flush with the cathode, the presence of the resin adjacent to the cathode edge can help maintain the gap between the compressed cathode and the uncompressed anode. This spacing can reduce the likelihood of short circuits.
[0018] Figure 1A A top view of a cathode-sized mask 12 on the anode 10 is shown. Figure 1B A top view of a cathode-sized mask 12 on the separator side 14 of a separator-anode laminate 16 according to one embodiment is shown. The separator-anode laminate 16 can have various material compositions, including but not limited to a sulfide-based separator portion 14 and a silicon-based anode portion 10, which can provide increased ionic conductivity and energy capacity, respectively. In some configurations, the separator portion 14 can be porous polyethylene-based. Figure 1C A top view of a plurality of resin layers 20 on the separator side 14 of a separator-anode laminate 16 having electrical tabs 18 is shown. The electrical tabs 18 can be attached to the anode side 10 of the separator-anode laminate 16 and extend from the side opposite the separator 14 to facilitate external electrical connection. The solid resin layers 20 can be printed inside the cathode-sized mask 12 in a manner that forms a solid resin carrier 20. The carrier 20 can extend away from the perimeter of the separator side 14 to receive the cathode. After forming the carrier 20, the cathode-sized mask 12 can be removed.
[0019] Figure 1D A top view of a cathode 22 placed inside the resin carrier 20 to form a battery cell 24 is shown. The cathode 22 is disposed inside the carrier 20 and is in direct contact with the separator side 14 of the separator-anode laminate 16. The material of the solid resin layer 20 can be a thermosetting material. Additionally, the resin 20 can have an elastic modulus within 10% of the elastic modulus of the cathode 22. In other configurations, the resin 20 can have an elastic modulus greater than the elastic modulus of the cathode 22. Figure 1E A cross-sectional view of a lithium-ion battery cell 24 taken along line V-V is shown. Figure 1D Figure 1F Figure 1D Schematic cross-sectional view of a compacted lithium-ion battery cell 24. During the compaction step, the cathode 22, the separator-anode laminate 16, and the solid resin carrier 20 are compressed together, which can increase the interfacial contact and overall cohesion of the battery cell 24. After the compaction step, the cathode can have a thickness of less than 40 μm. The adjacent outer surfaces of the carrier 20 and the cathode 22 can be flush. In some configurations, the thickness of the solid resin carrier 20 can be within 10% greater than or less than the thickness of the cathode 22.
[0020] Figure 2 A flowchart of an assembly process according to one embodiment is shown. Starting at block one 26, a solid resin carrier is printed around the perimeter of the separator side of the separator-anode laminate. The separator can be based on porous polyethylene. In other configurations, the separator can be based on sulfide and the anode can be based on a silicon composite. Electrical tabs can be attached to the anode side of the separator-anode laminate. The printing process can employ techniques such as 3D printing or screen printing. In block two 28, the cathode is disposed on the separator side and within the solid resin carrier. The material used for the solid resin can have a modulus of elasticity within 10% of the modulus of elasticity of the cathode. In block three 30, the solid resin carrier, the separator-anode laminate, and the cathode are compressed such that the adjacent outer surfaces of the solid resin carrier and the cathode are flush to form a compacted lithium-ion battery cell. The compaction step of block three 30 can include a pressure of at least 400 MPa to be applied.
[0021] The algorithms, methods, or processes disclosed or proposed herein can be conveyed to or implemented by a computer, controller, or processing device, which can include any dedicated electronic control unit or programmable electronic control unit. Similarly, the algorithms, methods, or processes can be stored in various forms as data and instructions executable by a computer or controller, including but not limited to information permanently stored on a non-writable storage medium such as a read-only memory device and information changeably stored on a writable storage medium such as an optical disc, a random access memory device, or other magnetic and optical media. The algorithms, methods, or processes can also be implemented as software-executable objects. Alternatively, suitable hardware components, such as application-specific integrated circuits, field-programmable gate arrays, state machines, or other hardware components or devices, or firmware, combinations of hardware and software components can be used to implement all or part of the algorithms, methods, or processes.
[0022] While the foregoing describes exemplary embodiments, these embodiments are not intended to describe all possible forms covered by the claims. The words used in the specification are descriptive words rather than restrictive words, and it should be understood that various changes can be made without departing from the spirit and scope of the disclosed materials.
[0023] As previously described, the features of various embodiments can be combined to form additional embodiments that may not be explicitly described or shown in the present disclosure. Although various embodiments may have been described as providing advantages or being preferred over other embodiments or prior art implementations with respect to one or more desired characteristics, those of ordinary skill in the art will recognize that one or more features or characteristics may be compromised to achieve the desired overall system attributes, depending on the particular application and implementation. These attributes may include, but are not limited to: strength, durability, marketability, appearance, packaging, size, serviceability, weight, manufacturability, ease of assembly, etc. Thus, embodiments that are described as less desirable than other embodiments or prior art implementations with respect to one or more characteristics are within the scope of the present disclosure and may be desirable for a particular application.
[0024] According to the present invention, there is provided a solid-state battery having: a compacted solid-state battery cell including a separator-anode laminate; a plurality of solid resin layers defining a perimeter around the separator side of the separator-anode laminate and extending away from the perimeter as a carrier; and a cathode disposed within the carrier and in direct contact with the separator side such that adjacent outer surfaces of the carrier and the cathode are flush.
[0025] According to one embodiment, the present invention is further characterized by an electrical tab attached to the anode side of the separator-anode laminate.
[0026] According to one embodiment, the separator portion of the separator-anode laminate is sulfide-based.
[0027] According to one embodiment, the anode portion of the separator-anode laminate is silicon-based.
[0028] According to one embodiment, the cathode has a thickness of less than 40 μm.
[0029] According to one embodiment, the elastic modulus of the solid resin layer is within 10% of the elastic modulus of the cathode.
[0030] According to the present invention, there is provided a lithium-ion battery having: a cathode; a separator and an anode laminated together; and a solid resin carrier printed on the separator and overlapping the anode such that the cathode can be placed inside the solid resin carrier and compressed together with the separator, anode, and solid resin carrier to form a battery cell.
[0031] According to one embodiment, the present invention is further characterized by an electrical tab connected to the anode, the electrical tab extending from a side opposite the separator.
[0032] According to one embodiment, the solid resin bracket has an elastic modulus within 10% of the elastic modulus of the cathode.
[0033] According to one embodiment, the solid resin bracket has an elastic modulus greater than the elastic modulus of the cathode.
[0034] According to one embodiment, the solid resin bracket has an elastic modulus less than the elastic modulus of the cathode.
[0035] According to one embodiment, the solid resin bracket has a thickness within 10% of the thickness of the cathode.
[0036] According to one embodiment, the solid resin bracket has a thickness greater than the thickness of the cathode.
[0037] According to one embodiment, the solid resin bracket has a thickness less than the thickness of the cathode.
[0038] According to one embodiment, the solid resin bracket is made of a thermosetting material.
[0039] According to one embodiment, the separator is based on porous polyethylene.
[0040] According to one embodiment, the separator is based on sulfide.
[0041] According to one embodiment, the anode is based on a silicon composite material.
[0042] According to the present invention, a method includes: printing a solid resin bracket around a separator side of a separator-anode laminate; disposing a cathode on the separator side and within the solid resin bracket; and compressing the solid resin bracket, the separator-anode laminate, and the cathode such that adjacent outer surfaces of the solid resin bracket and the cathode are flush to form a compacted lithium-ion battery cell.
[0043] In one aspect of the present invention, at least 400 MPa is applied during the compression of the solid resin bracket, the separator-anode laminate, and the cathode.
Claims
1. A solid-state battery, comprising: a compacted solid-state battery cell, the compacted solid-state battery cell comprising a separator-anode stack; a plurality of solid resin layers defining a bracket surrounding a perimeter of a separator side of the separator-anode stack and extending away from the perimeter; and a cathode disposed within the bracket and in direct contact with the separator side such that adjacent outer surfaces of the bracket and the cathode are flush.
2. The solid-state battery of claim 1 further comprising an electrical tab attached to the anode side of the separator-anode stack.
3. A solid-state battery as described in claim 1, wherein the separator portion of the separator-anode stack is sulfide based.
4. The solid-state battery of claim 1, wherein the anode portion of the separator-anode stack is silicon-based.
5. The solid-state battery of claim 1, wherein the cathode has a thickness of less than 40 μm.
6. The solid-state battery of claim 1, wherein the elastic modulus of the solid resin layer is within 10% of the elastic modulus of the cathode.
7. A lithium ion battery comprising: cathode; separators and anodes laminated together; as well as A solid resin carrier is printed on the separator and overlaps the anode so that the cathode can be placed inside the solid resin carrier and compressed with the separator, anode and solid resin carrier to form a battery cell.
8. The lithium ion battery of claim 7, further comprising an electrical tab connected to the anode, the electrical tab extending from a side opposite the separator.
9. The lithium ion battery of claim 7, wherein the solid resin bracket has an elastic modulus within 10% of the elastic modulus of the cathode.
10. The lithium ion battery of claim 7, wherein the solid resin bracket has an elastic modulus greater than an elastic modulus of the cathode.
11. The lithium ion battery of claim 7, wherein the solid resin bracket has an elastic modulus less than an elastic modulus of the cathode.
12. The lithium ion battery of claim 7, wherein the solid resin bracket has a thickness within 10% of the thickness of the cathode.
13. The lithium ion battery of claim 7, wherein the solid resin bracket has a thickness greater than a thickness of the cathode.
14. A method comprising: printing a solid resin bracket around the perimeter of the separator side of the separator-anode stack; disposing a cathode on the separator side and within the solid resin support; as well as The solid resin carrier, separator-anode stack, and cathode are compressed such that adjacent outer surfaces of the solid resin carrier and the cathode are flush to form a compacted lithium-ion battery cell.
15. The method of claim 14, wherein at least 400 MPa is applied during said compression of said solid resin carrier, separator-anode stack and cathode.