Pressure testing die
By setting up elastic gaskets in the pressure test mold of all solid state batteries, the problem of fragility of active particles during high-pressure pressing is solved, and the electrical performance of the battery is significantly improved.
Patent Information
- Application Number
- CN202420010241.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-03
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-01-03
AI Technical Summary
During the high-voltage compression process of all-solid state batteries, the active particles in the battery material are easily crushed, resulting in cracks in the pole sheet and degradation of electrical properties.
A pressure testing mold is designed, including a mold body, a first fluid collecting column, a second fluid collecting column, a first elastic gasket and a second elastic gasket. By providing the first and second elastic gaskets on both sides of the battery material, the active particles are ensured to contact the elastic gaskets in direct contact, and the problem of uneven stress under high pressure is alleviated.
It effectively reduces the breakage of active particles and the generation of pole cracks, and improves the electrical performance of all-solid-state batteries.
Smart Images
Figure CN222505940U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of all-solid-state battery testing devices, in particular to a pressure testing mold. Background Art
[0002] All-solid-state lithium batteries have attracted much attention due to their high safety, excellent electrochemical cycle performance and high energy density. All-solid-state batteries use solid electrolytes to replace liquid electrolytes and diaphragms, and press the solid electrolytes into thin films with a thickness of tens of microns, which greatly saves the internal space of the battery. However, the contact between the electrodes and the electrolyte of all-solid-state batteries is solid-solid contact, with poor ion / electron pathways and low conductivity. High pressure is required for pressing to make the contact between the electrodes and the solid electrolyte better.
[0003] However, in the prior art, active particles in the battery material are easily crushed during the high-pressure pressing process.
[0004] In view of this, the present utility model is proposed. Utility Model Content
[0005] The utility model aims to provide a pressure test mold, which can avoid or slow down the crushing of active particles in battery materials.
[0006] The utility model can be implemented like this:
[0007] The utility model provides a pressure test mold, which comprises a mold body, a first collector column, a second collector column, a first elastic gasket and a second elastic gasket;
[0008] The first current collector column has a first pressing end, and the first pressing end is used to extend into or exit the mold body along one end of the mold body;
[0009] The second current collector column has a second pressing end, and the second pressing end is used to extend into or exit the mold body along the other end of the mold body;
[0010] The first elastic gasket is arranged on the side of the first pressing end close to the second pressing end, and the second elastic gasket is arranged on the side of the second pressing end close to the first pressing end; wherein, the battery material used for molding the all-solid-state battery is filled between the first elastic gasket, the second elastic gasket and the mold body.
[0011] In an optional embodiment, the thickness of the first elastic gasket is 0.1 mm-2.00 mm.
[0012] In an optional embodiment, the thickness of the second elastic gasket is 0.1 mm-2.00 mm.
[0013] In an optional embodiment, the first elastic gasket is in contact with the first pressing end but is not connected.
[0014] In an optional embodiment, the second elastic gasket is in contact with the second pressing end but is not connected.
[0015] In an optional embodiment, the mold body includes an insulating inner core and an outer shell, the insulating inner core forms a molding cavity, both ends of the molding cavity are penetrated, one end of the molding cavity is used to allow the first pressing end to extend in or out, and the other end of the molding cavity is used to allow the second pressing end to extend in or out; the outer shell is mounted on the outside of the inner core.
[0016] In an optional embodiment, the outer shell includes a metal inner layer and an insulating outer layer, the metal inner layer is sleeved onto the outside of the inner core, and the insulating outer layer is sleeved onto the outside of the metal inner layer.
[0017] In an optional embodiment, the pressure testing mold further comprises a sealing cover for fixing at least one of the first current collector column and the second current collector column to the mold body.
[0018] In an optional embodiment, the pressure testing mold further includes a first sealing ring, and the first sealing ring is used to fit the first current collector column.
[0019] In an optional embodiment, the pressure testing mold further includes a second sealing ring, and the second sealing ring is used to fit the second current collector column.
[0020] The beneficial effects of the utility model include:
[0021] The pressure testing mold provided by the utility model is used for the preparation of all-solid-state batteries. The first elastic gasket and the second elastic gasket are respectively arranged on both sides of the battery material. During the preparation process of the all-solid-state battery, the active particles in the battery material are in direct contact with the first elastic gasket and the second elastic gasket arranged above and below, which can alleviate the uneven force caused by uneven powder spreading during high-pressure pressing, thereby reducing the breakage of the active particles and the generation of cracks in the pole pieces, and ultimately improving the electrical performance of the all-solid-state battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 A schematic diagram of the structure of a pressure test mold provided in an embodiment;
[0024] Figure 2 for Figure 1 Internal schematic diagram of the medium pressure test mold;
[0025] Figure 3 for Figure 2 An enlarged schematic diagram of the local location of the pressure test mold.
[0026] Icons: 100-pressure test mold; 10-mold body; 11-insulating inner core; 12-outer shell; 121-metal inner layer; 122-insulating outer layer; 21-first collector column; 22-second collector column; 31-first elastic gasket; 32-second elastic gasket; 40-sealing cover; 51-first sealing ring; 52-second sealing ring; 200-battery material. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0030] In the description of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the directions or positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present utility model. In addition, if the terms "first", "second", "third" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0031] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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.
[0033] Example
[0034] The researchers found that the structure of the all-solid-state battery pressurized test mold in the related technology is: an insulating inner core in the middle, a reinforcement shell on the outside, and positive and negative current collector columns on the top and bottom, respectively. The current collector columns are made of stainless steel. In addition to good rust resistance and corrosion resistance, they also have high hardness and can withstand greater pressure. When this pressure mold is used to press powder, it is difficult for the powder material to reach a completely evenly flat state, and the force at different positions during the high-pressure process is uneven, which makes the pole piece prone to cracks. At the same time, because the stainless steel current collector column has a large elastic modulus and is not easy to deform, it is easy to crush the active particles when a large pressure is applied. Both cracks in the electrode pole piece and fragmentation of the electrode material particles will lead to poor electrical performance of the all-solid-state battery.
[0035] Therefore, how to avoid or alleviate the easy crushing of active particles in battery materials during high-pressure pressing is a technical problem that needs to be solved urgently in this field.
[0036] Please refer to Figures 1 to 3 This embodiment provides a pressure test mold 100, which can effectively improve the above problems. For example, it can ensure that the solid-state electrode does not crack and the active particles are not easy to break during the high-pressure pressing process, so that the all-solid-state battery prepared by the pressure test mold 100 has good performance.
[0037] The pressure testing mold 100 includes a mold body 10 , a first current collector column 21 , a second current collector column 22 , a first elastic gasket 31 and a second elastic gasket 32 .
[0038] The first current collector column 21 has a first pressing end, and the first pressing end is used to extend into or exit the mold body 10 along one end of the mold body 10. Figure 2The first pressing end is the lower end of the first current collector column 21 .
[0039] The second current collector column 22 has a second pressing end, and the second pressing end is used to extend into or exit the mold body 10 along the other end of the mold body 10. Figure 2 The second pressing end is the upper end of the second current collector column 22 .
[0040] The first elastic gasket 31 is disposed on a side of the first pressing end close to the second pressing end, and the second elastic gasket 32 is disposed on a side of the second pressing end close to the first pressing end. The first elastic gasket 31, the second elastic gasket 32 and the mold body 10 are used to fill the battery material 200 for molding the all-solid-state battery.
[0041] The pressure testing mold 100 uses a first elastic gasket 31 and a second elastic gasket 32 to be respectively arranged on both sides of the battery material 200. During the preparation process of the all-solid-state battery, the active particles in the battery material 200 are in direct contact with the first elastic gasket 31 and the second elastic gasket 32 arranged above and below, which can alleviate the uneven force caused by uneven powder spreading during high-pressure pressing, thereby reducing the breakage of the active particles and the generation of cracks in the pole pieces, and ultimately improving the electrical performance of the all-solid-state battery.
[0042] In this embodiment, the thickness of the first elastic gasket 31 may be 0.1 mm-2.00 mm, such as 0.10 mm, 0.50 mm, 1.00 mm, 1.50 mm, 1.70 mm or 2.00 mm, or any other value within the range of 0.1 mm-2.00 mm.
[0043] Similarly, the thickness of the second elastic gasket 32 may also be 0.1 mm-2.00 mm, such as 0.10 mm, 0.50 mm, 1.00 mm, 1.50 mm, 1.70 mm or 2.00 mm, or any other value within the range of 0.1 mm-2.00 mm.
[0044] In this embodiment, the Young's modulus of the first elastic gasket 31 may be 0.01 MPa-100.00 MPa, for example, 0.01 MPa, 0.05 MPa, 1.50 MPa, 10.00 MPa, 50.00 MPa, 70.00 MPa, 90.00 MPa or 100.00 MPa.
[0045] The Young's modulus of the second elastic gasket 32 may also be 0.01 MPa-100.00 MPa, for example, 0.01 MPa, 0.05 MPa, 1.50 MPa, 10.00 MPa, 50.00 MPa, 70.00 MPa, 90.00 MPa or 100.00 MPa.
[0046] For reference, the material of the first elastic gasket 31 can be rubber or silicone. Similarly, the material of the second elastic gasket 32 can also be rubber or silicone.
[0047] In order to facilitate the removal of the first elastic gasket 31 and improve its bonding effect with the battery material 200, in this embodiment, the first elastic gasket 31 is bonded to the first pressing end but not connected. Similarly, the second elastic gasket 32 can also be bonded to the second pressing end but not connected.
[0048] Combination Figure 2 In this embodiment, the mold body 10 includes an insulating inner core 11 and an outer shell 12. The insulating inner core 11 forms a molding cavity, and both ends of the molding cavity are penetrated. One end of the molding cavity is used to allow the first pressing end to extend in or out, and the other end of the molding cavity is used to allow the second pressing end to extend in or out; the outer shell 12 is mounted on the outside of the inner core.
[0049] The insulating core 11 is made of insulating material to prevent the battery from short circuiting. The outer shell 12 can improve the overall strength.
[0050] Specifically, the outer shell 12 includes a metal inner layer 121 and an insulating outer layer 122 . The metal inner layer 121 is sheathed onto the outside of the inner core, and the insulating outer layer 122 is sheathed onto the outside of the metal inner layer 121 .
[0051] In this embodiment, the shell 12 is divided into an inner layer and an outer layer. The inner layer is a metal inner layer 121, for example, its material is stainless steel, which can improve the compressive strength of the entire mold. The outer layer is an insulating outer layer 122, for example, its material is plastic, which mainly plays an insulating role.
[0052] In order to improve the high pressure resistance of the mold, the insulating outer layer 122 is tightly fitted to the metal inner layer 121 , and the metal inner layer 121 is tightly fitted to the insulating inner core 11 .
[0053] Combination Figure 2 In this embodiment, the pressure test mold 100 may further include a sealing cover 40, which is used to fix at least one of the first current collector column 21 and the second current collector column 22 to the mold body 10. The design of the sealing cover 40 can play a role in fixing the current collector column.
[0054] For reference, the sealing cap 40 may be mounted only on the first current collector column 21, or only on the second current collector column 22. Alternatively, a sealing cap 40 may be mounted on both the first current collector column 21 and the second current collector column 22.
[0055] Combination Figure 2In this embodiment, the pressure test mold 100 may further include a first sealing ring 51, and the first sealing ring 51 is used to fit the first current collector column 21. The first sealing ring 51 has the function of improving the sealing performance of the entire mold.
[0056] Furthermore, the pressure test mold 100 may also include a second sealing ring 52, and the second sealing ring 52 is used to fit the second current collector column 22. The second sealing ring 52 also has the function of improving the sealing performance of the entire mold.
[0057] Combination Figures 1 to 3 In some embodiments, the first current collector column 21 and the second current collector column 22 can be made of stainless steel, which has a Young's modulus between 200 and 800 Gpa, a high hardness, and is not easy to deform. The lower end of the first current collector column 21 and the upper end of the second current collector column 22 can be provided with an elastic material layer with a thickness of 1.00 mm (i.e., a first elastic gasket 31 and a second elastic gasket 32). The elastic material layer can fit the current collector column but not be connected, which is convenient for removal. The elastic material has the characteristics of low Young's modulus, good chemical stability, strong corrosion resistance, and non-volatility. The use of elastic materials can avoid direct contact between the active particles in the battery material 200 and the rigid stainless steel, and make the force at each position of the pole piece during the pressing process as uniform as possible, reduce the breakage of the active particles, and avoid cracks in the pole piece. The final all-solid-state battery has better performance.
[0058] The diameter of the insulating core 11 can be completely consistent with the diameter of the current collector column, and its material can be an insulating material with good chemical stability, excellent corrosion resistance, and strong rigidity, and does not react with solid electrolytes or positive and negative electrode materials, such as ceramics, aluminum oxide, silicon oxide, etc. Among them, the outer shell 12 includes an inner and outer layer, the outer layer is plastic, and the inner layer is a stainless steel sleeve (the heat treatment temperature of the stainless steel sleeve is greater than 800°C), and the inner and outer layers are completely bonded. In order to improve the high pressure resistance of the mold, the inner layer is also completely bonded to the inner core.
[0059] Typically, the first current collector column 21 is in contact with the positive electrode for transmitting pressure and conducting current; the second current collector column 22 is in contact with the negative electrode for transmitting pressure and conducting current; the first current collector column 21 and the second current collector column 22 are each led out with wires separately to avoid accidental short circuit during testing.
[0060] As mentioned above, the working process of the pressure testing mold 100 provided in the present application includes:
[0061] When preparing the all-solid-state battery, first insert the second current collector column 22 into the mold body 10, put in the second elastic gasket 32, then add the negative electrode powder into the mold body 10 from the top and evenly flatten it, put in the first elastic gasket 31, insert the second current collector column 22, and press it. After the pressing is completed, take out the first current collector column 21 and the first elastic gasket 31, add the solid electrolyte powder and flatten it, then wipe the clean first elastic gasket 31 and the first current collector column 21 into the mold body 10 and press it.
[0062] After the pressing is completed, take out the first current collector column 21 and the first elastic gasket 31, add the positive electrode powder and flatten it, then insert the wiped clean first elastic gasket 31 and the first current collector column 21 into the mold body 10 for pressing. After the pressing is completed, take out the first elastic gasket 31 and the second elastic gasket 32, put in the corresponding first sealing ring 51 and the second sealing ring 52, tighten the sealing cover 40, put the whole mold in a constant temperature test box, keep it warm, connect the leads, and test it.
[0063] In summary, the pressure testing mold 100 provided by the utility model is used for the preparation of all-solid-state batteries. The pressure testing mold 100 uses a first elastic gasket 31 and a second elastic gasket 32 respectively arranged on both sides of the battery material 200. During the preparation of the all-solid-state battery, the active particles in the battery material 200 are in direct contact with the first elastic gasket 31 and the second elastic gasket 32 arranged above and below, which can alleviate the uneven force caused by uneven powder spreading during high-pressure pressing, thereby reducing the breakage of active particles and the generation of cracks in the pole pieces, and ultimately improving the electrical performance of the all-solid-state battery.
[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A pressure test mold, characterized in that: The pressure test mold includes a mold body, a first current collector column, a second current collector column, a first elastic gasket and a second elastic gasket; The first current collector column has a first pressing end, and the first pressing end is used to extend into or exit the mold body along one end of the mold body; The second current collector column has a second pressing end, and the second pressing end is used to extend into or exit the mold body along the other end of the mold body; The first elastic gasket is arranged on a side of the first pressing end close to the second pressing end, and the second elastic gasket is arranged on a side of the second pressing end close to the first pressing end; wherein, the first elastic gasket, the second elastic gasket and the mold body are used to fill battery materials for molding all-solid-state batteries.
2. The pressure testing mold according to claim 1, characterized in that: The thickness of the first elastic gasket is 0.1 mm-2.00 mm.
3. The pressure testing mold according to claim 1, characterized in that: The thickness of the second elastic gasket is 0.1 mm-2.00 mm.
4. The pressure testing mold according to claim 1, characterized in that: The first elastic gasket is in contact with the first pressing end but is not connected thereto.
5. The pressure testing mold according to claim 1, characterized in that: The second elastic gasket is in contact with the second pressing end but is not connected thereto.
6. The pressure testing mold according to any one of claims 1 to 5, characterized in that: The mold body includes an insulating inner core and an outer shell, the insulating inner core forms a molding cavity, the two ends of the molding cavity are penetrated, one end of the molding cavity is used to allow the first pressing end to extend in or out, and the other end of the molding cavity is used to allow the second pressing end to extend in or out; the outer shell is mounted on the outside of the inner core.
7. The pressure testing mold according to claim 6, characterized in that: The outer shell comprises a metal inner layer and an insulating outer layer, wherein the metal inner layer is sheathed onto the outside of the inner core, and the insulating outer layer is sheathed onto the outside of the metal inner layer.
8. The pressure testing mold according to claim 6, characterized in that: The pressure testing mold further includes a sealing cover for fixing at least one of the first current collector column and the second current collector column to the mold body.
9. The pressure testing mold according to any one of claims 1 to 5, characterized in that: The pressure testing mold further includes a first sealing ring, and the first sealing ring is used to fit the first current collector column.
10. The pressure testing mold according to claim 9, characterized in that: The pressure testing mold further comprises a second sealing ring, and the second sealing ring is used for fitting the second current collector column.