Half cell and half cell preparation system
By designing a half-cell including a monopole sheet, a composite sheet and a diaphragm bag, and providing a corresponding preparation system, the problem of the inability of the prior art to effectively prepare sodium ion sheet and perform failure analysis, and efficient battery preparation and performance testing are achieved.
Patent Information
- Application Number
- CN202420361708.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-27
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-02-27
AI Technical Summary
The prior art cannot effectively prepare sodium ion monolithic half-cells, and the failure analysis of sodium ion batteries cannot be carried out, resulting in performance attenuation and safety problems.
A half-cell is designed, including a first diaphragm bag, a single pole sheet, a second diaphragm bag, a composite pole sheet and an aluminum-plastic film. By loading the monopole sheet into the first diaphragm bag, the composite pole sheet is loaded into the second diaphragm bag, and stacked in the aluminum-plastic film to form a half-cell. At the same time, a half-cell preparation system is provided, including a scraper, an ultrasonic welding machine and a sheet cutting device for preparing and assembling a half-cell.
It realizes effective preparation and testing of half-cells, meets the failure analysis needs of sodium ion batteries, and improves the performance and safety of the batteries.
Smart Images
Figure CN222581212U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of half batteries, and in particular relates to a half battery and a half battery preparation system. Background Art
[0002] With the rapid development of large-scale energy storage, smart grid and other products, the requirements for energy storage batteries' energy, safety and other performance are getting higher and higher. Sodium and lithium have similar chemical properties. Compared with lithium batteries, sodium batteries can effectively reduce costs, so they are regarded as the best alternative to lithium-ion batteries in the future. Sodium-ion batteries will fail during the manufacturing and use process. In order to avoid performance degradation and safety issues, it is imperative to carry out sodium-ion battery failure analysis.
[0003] Selecting appropriate performance test and analysis methods for sodium ion failure analysis and exploring its main mechanisms in materials and manufacturing can effectively improve battery performance. These performance evaluations require the battery cells to be disassembled, reassembled and tested again. Button batteries are generally used, but there are disadvantages of electrochemical performance testing such as single test items and poor consistency; monolithic half-cells can test reversible and residual capacity, impedance, potential changes, etc., which are of irreplaceable importance for the mechanism research at the cell-electrode-material level in failure analysis. However, due to the complex preparation method of sodium ion half-cells and the high requirements for the water-oxygen environment system, no research has been carried out on this.
[0004] The prior art mentions a monolithic lithium-ion battery, but it is mainly aimed at the preparation method of lithium-ion monolithic batteries, which cannot meet the preparation requirements of sodium-ion monolithic half-cells, nor can it carry out failure analysis of sodium ions; the prior art also mentions a battery half-cell, a battery and its manufacture, but its half-cell preparation cannot meet the preparation requirements of sodium-ion monolithic half-cells, nor can it carry out failure analysis of sodium ions.
[0005] Therefore, there is an urgent need to develop a new half-cell and a half-cell preparation system to solve the above problems. Utility Model Content
[0006] The utility model aims to provide a half-cell and a half-cell preparation system.
[0007] In order to solve the above technical problems, the utility model provides a half-cell, which comprises: a first diaphragm bag, a monopolar pole piece, a second diaphragm bag, a composite pole piece and an aluminum-plastic film; wherein the monopolar pole piece is placed in the first diaphragm bag, the composite pole piece is placed in the second diaphragm bag, and the aluminum-plastic film covers the first diaphragm bag and the second diaphragm bag.
[0008] Specifically, the monopolar pole piece is provided with a monopolar pole piece tab, and the composite pole piece is provided with a composite pole piece tab.
[0009] Specifically, the center points of the single-pole pole piece tab and the composite pole piece tab overlap.
[0010] Specifically, the monopolar pole piece is a positive pole piece or a negative pole piece.
[0011] Specifically, the coated area of the aluminum-plastic film is a vacuum cavity, and the vacuum cavity is filled with electrolyte.
[0012] Specifically, the area of the monopole pole piece is smaller than the area of the composite pole piece.
[0013] Specifically, the composite pole piece includes: an aluminum foil and a sodium metal coating layer; the sodium metal coating layer is coated on the surface of the aluminum foil.
[0014] Specifically, the thickness of the aluminum foil is 50-200 microns; the thickness of the sodium metal coating layer is 30-60 microns.
[0015] Specifically, the area of the monopolar pole piece is smaller than the area of the first diaphragm bag; the area of the composite pole piece is smaller than the area of the second diaphragm bag.
[0016] On the other hand, the utility model provides a half-cell preparation system, which includes: a scraper, located at a decoating station to prepare a monopolar pole piece; an ultrasonic welding machine, located at a welding station to weld the monopolar pole piece ear to the monopolar pole piece; a cutting device, located at a cutting station to cut out the corresponding composite pole piece; the coating station, welding station, and cutting station are arranged around an assembly station, so that at the assembly station, the monopolar pole piece is placed in a first diaphragm bag, the composite pole piece is placed in a second diaphragm bag, and the first diaphragm bag and the second diaphragm bag are covered with an aluminum-plastic film to prepare a half-cell as described above.
[0017] The beneficial effect of the utility model is that the utility model ensures that the half-cell can complete the test requirements such as capacity, impedance, cycle, rate, high and low temperature, EIS, potential change, etc., thereby meeting the failure analysis requirements by loading the monopolar pole piece into the first diaphragm bag, loading the composite pole piece into the second diaphragm bag, and assembling the monopolar pole piece and the composite pole piece into a half-cell in an aluminum-plastic film by stacking.
[0018] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by implementing the present invention.
[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a structural diagram of a half-battery of the utility model;
[0022] Figure 2 It is a structural diagram of the half-battery preparation system of the utility model.
[0023] In the figure:
[0024] 1. First diaphragm bag; 2. Monopolar pole piece; 3. Second diaphragm bag; 4. Composite pole piece; 5. Aluminum-plastic film; 6. Monopolar pole piece ear; 7. Composite pole piece ear; 8. Scraper; 9. Decoating station; 10. Ultrasonic welding machine; 11. Welding station; 12. Cutting equipment; 13. Cutting station; 14. Assembly station. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Embodiment 1, in this embodiment, as Figure 1 As shown, this embodiment provides a half-cell, which includes: a first diaphragm bag 1, a monopolar pole piece 2, a second diaphragm bag 3, a composite pole piece 4 and an aluminum-plastic film 5; wherein the monopolar pole piece 2 is placed in the first diaphragm bag 1, the composite pole piece 4 is placed in the second diaphragm bag 3, and the aluminum-plastic film 5 covers the first diaphragm bag 1 and the second diaphragm bag 3.
[0027] Specifically, the monopolar pole piece 2 may be a positive pole piece or a negative pole piece, and the monopolar pole piece 2 is obtained by cleaning and drying a disassembled battery cell using dimethyl carbonate (DMC).
[0028] In this embodiment, the first diaphragm bag 1 and the second diaphragm bag 3 function to isolate the monopolar pole piece 2 from the composite pole piece 4 .
[0029] In this embodiment, the monopolar pole piece 2 is loaded into the first diaphragm bag 1, the composite pole piece 4 is loaded into the second diaphragm bag 3, and the monopolar pole piece 2 and the composite pole piece 4 are assembled into a half-cell in the aluminum-plastic film 5 by stacking, so as to ensure that the half-cell can complete the test requirements such as capacity, impedance, cycle, rate, high and low temperature, EIS, potential change, etc., thereby meeting the failure analysis requirements.
[0030] In order to realize half-cell assembly, the monopolar pole piece 2 is provided with a monopolar pole piece tab 6 , and the composite pole piece 4 is provided with a composite pole piece tab 7 .
[0031] For the convenience of detection, the center points of the single-pole pole piece tab 6 and the composite pole piece tab 7 overlap.
[0032] Specifically, the monopolar pole piece 2 is a positive pole piece or a negative pole piece.
[0033] Specifically, the coated area of the aluminum-plastic film 5 is a vacuum cavity, and the vacuum cavity is filled with electrolyte.
[0034] Specifically, the area of the monopolar pole piece 2 is smaller than the area of the composite pole piece 4 .
[0035] In order to enable the composite pole piece 4 to be used as an anode, the composite pole piece 4 includes: an aluminum foil and a sodium metal coating layer; the sodium metal coating layer is coated on the surface of the aluminum foil.
[0036] Specifically, the composite electrode piece 4 serving as the anode is obtained by coating pure sodium on aluminum foil.
[0037] Specifically, the tabs are led out from the aluminum foil, and ultrasonic welding of the tabs is not required. The assembly is simple and the impedance is low, which saves labor costs and material costs, and physical and chemical evaluations can be performed quickly, accurately and reliably.
[0038] Specifically, the thickness of the aluminum foil is 50-200 microns; the thickness of the sodium metal coating layer is 30-60 microns.
[0039] In order to be able to mount the monopolar pole piece 2 and the composite pole piece 4 , the area of the monopolar pole piece 2 is smaller than the area of the first diaphragm bag 1 ; the area of the composite pole piece 4 is smaller than the area of the second diaphragm bag 3 .
[0040] Specifically, the length and width of the first diaphragm bag 1 are both 1-3 mm larger than the monopolar pole piece 2 .
[0041] Specifically, the length and width of the second diaphragm bag 3 are both 1-3 mm larger than the composite pole piece 4 .
[0042] Specifically, the length and width of the composite pole piece 4 are 1-3 mm larger than those of the single-pole pole piece 2 .
[0043] As an optional embodiment of the half-cell, the monopolar pole piece 2 is 66 mm long and 36 mm wide or 70 mm long and 40 mm wide, the first diaphragm bag 1 is 70 mm long and 40 mm wide or 74 mm long and 44 mm wide, the composite pole piece 4 is 74 mm long and 44 mm wide, the second diaphragm bag 3 is 78 mm long and 48 mm wide, the thickness of the aluminum foil is 80 microns, and the thickness of the sodium metal coating is 30 microns.
[0044] As another optional embodiment of the half-cell, the monopolar pole piece 2 is 66 mm long and 36 mm wide or 70 mm long and 40 mm wide, the first diaphragm bag 1 is 70 mm long and 40 mm wide or 74 mm long and 44 mm wide, the composite pole piece 4 is 74 mm long and 44 mm wide, the second diaphragm bag 3 is 78 mm long and 48 mm wide, the thickness of the aluminum foil is 100 microns, and the thickness of the sodium metal coating is 50 microns.
[0045] In the working process, the composite electrode 4 placed in the second diaphragm bag 3 is used as the anode, and the monopolar electrode 2 with the electrode ears welded in the first diaphragm bag 1 is placed on it in turn for assembly, ensuring that the center points of the monopolar electrode 2 and the negative electrode overlap to obtain a single-stack battery cell; the single-stack battery cell is placed in an aluminum-plastic film 5, and the electrolyte is injected, vacuumed, and finally packaged to obtain a single-stack soft-pack sodium ion half-cell.
[0046] Specifically, the positive electrode sheet or negative electrode sheet obtained by disassembling the battery cell is covered with blue insulating tape or the coated area is removed with a scraper. The positive electrode sheet or negative electrode sheet serves as the cathode of the reassembled single-chip half-cell, and the pole ear is ultrasonically welded to the positive electrode sheet or negative electrode sheet in advance; an aluminum sheet covered with pure sodium is used as the anode of the half-cell, and the cathode and anode are both placed in a special diaphragm bag, and the anode sheet, diaphragm, and cathode sheet are stacked, followed by top and side sealing, battery cell drying, and liquid injection pre-sealing operations to obtain the required single-chip soft-pack half-cell.
[0047] Specifically, the loss caused by sodium ion deintercalation is avoided and sodium ions are ensured to be transmitted only on the anode and cathode sides. This allows for rapid evaluation of material properties without the need for ultrasonic welding after assembly and avoids welding of the pole ears in the glove box, thus saving space.
[0048] Embodiment 2, on the basis of embodiment 1, as Figure 1 to Figure 2As shown, this embodiment provides a half-cell preparation system, which includes: a scraper 8, located at a decoating station 9, to prepare a monopolar pole piece 2; an ultrasonic welding machine 10, located at a welding station 11, to weld a monopolar pole piece ear 7 to the monopolar pole piece 2; a cutting device 12, located at a cutting station 13, to cut out a corresponding composite pole piece 4; the coating station 9, the welding station 11, and the cutting station 13 are arranged around an assembly station 14, so that the monopolar pole piece 2 is placed in a first diaphragm bag 1, the composite pole piece is placed in a second diaphragm bag 3, and the aluminum-plastic film 5 is used to cover the first diaphragm bag 1 and the second diaphragm bag 3 at the assembly station 14, so as to prepare a half-cell as provided in Example 1.
[0049] In summary, the utility model ensures that the half-cell can complete the test requirements such as capacity, impedance, cycle, rate, high and low temperature, EIS, potential change, etc., and thus meet the failure analysis requirements by loading the monopolar pole piece into the first diaphragm bag, loading the composite pole piece into the second diaphragm bag, and assembling the monopolar pole piece and the composite pole piece into a half-cell in an aluminum-plastic film by stacking.
[0050] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles can be known by those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.
[0051] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0053] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.
[0054] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0055] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
[0056] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A half-cell, characterized in that: include: A first diaphragm bag, a monopolar pole piece, a second diaphragm bag, a composite pole piece and an aluminum-plastic film; in The monopolar pole piece is placed in a first diaphragm bag, the composite pole piece is placed in a second diaphragm bag, and the aluminum-plastic film covers the first diaphragm bag and the second diaphragm bag.
2. The half-cell according to claim 1, characterized in that The monopolar pole piece is provided with a monopolar pole piece tab, and the composite pole piece is provided with a composite pole piece tab.
3. The half-cell according to claim 2, characterized in that The center points of the single pole piece tab and the composite pole piece tab overlap.
4. The half-cell according to claim 1, characterized in that The monopolar pole piece is a positive pole piece or a negative pole piece.
5. The half-cell according to claim 1, characterized in that The coated area of the aluminum-plastic film is a vacuum cavity, and the vacuum cavity is filled with electrolyte.
6. The half-cell according to claim 1, characterized in that The area of the monopolar pole piece is smaller than the area of the composite pole piece.
7. The half-cell according to claim 1, characterized in that The composite pole piece comprises: an aluminum foil and a sodium metal coating layer; The sodium metal coating layer is coated on the surface of the aluminum foil.
8. The half-cell according to claim 7, characterized in that The thickness of the aluminum foil is 50-200 microns; The thickness of the sodium metal coating layer is 30-60 microns.
9. The half-cell according to claim 1, characterized in that The area of the monopolar pole piece is smaller than the area of the first diaphragm bag; The area of the composite pole piece is smaller than the area of the second diaphragm bag.
10. A half-cell preparation system, characterized in that: include: A scraper, located at the decoating station, to prepare a single-pole pole piece; An ultrasonic welding machine is located at the welding station to weld the monopolar pole piece tab to the monopolar pole piece; The cutting equipment is located at the cutting station to cut out the corresponding composite electrode; The coating station, welding station, and cutting station are arranged around the assembly station, so that at the assembly station, the monopolar electrode sheet is placed in the first diaphragm bag, the composite electrode sheet is placed in the second diaphragm bag, and the aluminum-plastic film is coated on the first diaphragm bag and the second diaphragm bag to prepare the half-cell as described in any one of claims 1 to 9.