An isostatic pressing device for all-solid-state batteries

Abstract

The utility model discloses an isostatic pressing device of all solid state battery, including the casing of upper end opening and upper cover, the casing is formed isostatic pressing chamber in, the upper cover covers the upper end of casing, be provided with the cylinder in isostatic pressing chamber, the all solid state battery is placed in the cylinder, the cylinder includes left half, insulating partition and right half, left half, insulating partition and right half are connected in proper order, the clamp for with the pole ear electric connection of all solid state battery is arranged on left half, right half respectively, left half with upper cover electricity is connected, right half with casing electricity is connected, be provided with insulating seal ring between casing and upper cover, the advantage is to have isostatic pressing function and in situ function, help to shorten preparation procedure, improve production efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of all-solid-state battery production equipment, and in particular relates to an isostatic pressure device for all-solid-state batteries. Background Technology

[0002] As a next-generation battery technology, all-solid-state batteries offer advantages such as high energy density, long cycle life, and high safety. However, they also suffer from problems such as insufficient density and poor contact between the electrodes and electrolyte. To address these issues, those skilled in the art have developed isostatic pressing devices for all-solid-state batteries. These devices are specifically designed to perform isostatic pressing treatment on battery materials or battery modules, aiming to improve the density, interfacial contact, and overall performance of battery materials, playing a crucial role in battery manufacturing processes.

[0003] A conventional isostatic pressing (OSP) apparatus consists of a container and a tray inside the container. During operation, a solid-state battery is placed on the tray, the container is closed, and the apparatus is activated to fill the container with a high-pressure medium. This high-pressure medium acts evenly on all surfaces of the solid-state battery. After maintaining the pressure for a period of time, the pressure is released, and finally the container is opened and the solid-state battery is removed. It is evident that conventional OSP apparatuses have a limited function. After isostatic pressing, the solid-state battery still requires in-situ formation, resulting in numerous manufacturing steps and low production efficiency. Therefore, developing an OSP apparatus that combines isostatic pressing and in-situ formation functions is of paramount importance. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an isostatic pressing device for all-solid-state batteries, which has both isostatic pressing function and in-situ formation function, and helps to shorten the preparation process and improve production efficiency.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an isostatic pressure device for an all-solid-state battery, including a shell with an open upper end and a top cover, an isostatic pressure chamber is formed inside the shell, the top cover covers the upper end of the shell, a cylindrical body is arranged inside the isostatic pressure chamber, an all-solid-state battery is placed inside the cylindrical body, the cylindrical body includes a left half, an insulating spacer and a right half, the left half, the insulating spacer and the right half are connected in sequence, clamps for electrically connecting with the tabs of the all-solid-state battery are respectively arranged on the left half and the right half, the left half is electrically connected to the top cover, the right half is electrically connected to the shell, and an insulating sealing ring is arranged between the shell and the top cover.

[0006] Preferably, the clamp includes a wire and a conductive clamp, one end of the wire being connected to the left half or the right half, and the other end of the wire being connected to the conductive clamp, which is used to hold the tabs of the all-solid-state battery.

[0007] Preferably, the conductive clamp includes a mounting plate, on which two side plates are integrally formed, forming a clamping space between the two side plates. One side plate is provided with a screw hole and a bolt. The tab of the all-solid-state battery extends into the clamping space. After the bolt passes through the screw hole, it cooperates with the other side plate to clamp the tab of the all-solid-state battery.

[0008] Preferably, multiple cylindrical bodies are provided, and the multiple cylindrical bodies are distributed in the vertical direction. All the left halves are stacked sequentially from bottom to top, and all the right halves are stacked sequentially from bottom to top. The uppermost left halves are electrically connected to the top cover, and the lowermost right halves are electrically connected to the shell.

[0009] Preferably, the lower end face of the cylinder is provided with a plurality of positioning grooves, and the upper end of the cylinder is provided with a plurality of positioning blocks, wherein the positioning blocks on the lower side of the cylinder are inserted into the positioning grooves on the upper side of the cylinder.

[0010] Preferably, the lower end face of the left half is provided with a positioning groove, the upper end face of the left half is provided with a positioning block, the lower end face of the right half is provided with two positioning grooves, and the upper end face of the right half is provided with two positioning blocks.

[0011] Preferably, a first insulating layer is provided between the uppermost cylindrical body and the top cover, and the first insulating layer is provided with a first through hole and a first conductive element. The left half is electrically connected to the top cover through the first conductive element. A second insulating layer is provided between the lowermost cylindrical body and the shell, and the second insulating layer is provided with a second through hole and a second conductive element. The right half is electrically connected to the inner bottom surface of the shell through the second conductive element.

[0012] Preferably, the first conductive element and the second conductive element are both conductive springs.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] 1. By setting a cylinder in the isostatic chamber, the cylinder includes a left half, an insulating spacer and a right half, and clamps for electrical connection with the tabs of the all-solid-state battery are respectively set on the left half and the right half. During the isostatic process, the all-solid-state battery can be powered by an external power source to achieve in-situ formation, which helps to shorten the preparation process and improve the production efficiency of the all-solid-state battery.

[0015] 2. Compared with conventional in-situ formation, the contact between the electrolyte and the electrode of all-solid-state batteries formed under high voltage is closer, which can form a stable and complete solid electrolyte interface (SEI film), significantly improving the utilization rate of active materials and interface compatibility of all-solid-state batteries. Ultimately, it can improve the cycle performance and specific capacity of all-solid-state batteries in the later stage, that is, improve the performance of all-solid-state batteries.

[0016] 3. This technical solution is also applicable to testing the cycle performance of all-solid-state batteries under high pressure, and has good applicability;

[0017] 4. By setting up multiple stacked cylinders in the isostatic pressure chamber, each cylinder can hold one all-solid-state battery. Multiple all-solid-state batteries can be processed at once in each operation, which greatly improves processing efficiency, shortens the production cycle, and helps to increase output.

[0018] 5. The parallel processing of multiple all-solid-state batteries can reduce the frequency of workers opening and closing the top cover, which helps to further shorten the processing time of all-solid-state batteries;

[0019] 6. The stacking design of the cylinders makes reasonable use of the space of the isostatic chamber, which makes the size of the whole device compact, while ensuring the independent processing space of each solid-state battery and avoiding interference between solid-state batteries. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the middle cylinder of this utility model. Figure 1 ;

[0023] Figure 4 This is a schematic diagram of the circuit connection in this utility model;

[0024] Figure 5 This is a schematic diagram of the fixture in this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the middle cylinder of this utility model. Figure 2 ;

[0026] Figure 7 This is a cross-sectional structural diagram of the present invention;

[0027] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0028] Figure 9 for Figure 7 Enlarged diagram of point B in the middle.

[0029] In the diagram: 1. Shell; 11. Isostatic chamber; 2. Top cover; 3. Cylinder; 31. Left half; 32. Insulating strip; 33. Right half; 34. Positioning groove; 35. Positioning block; 4. All-solid-state battery; 5. Clamp; 51. Wire; 52. Conductive clamp; 521. Mounting plate; 522. Side plate; 523. Screw hole; 524. Bolt; 6. Insulating sealing ring; 7. First insulating layer; 71. First through hole; 72. First conductive element; 8. Second insulating layer; 81. Second through hole; 82. Second conductive element. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Example 1: As Figures 1 to 3 As shown, an isostatic pressure device for an all-solid-state battery includes a housing 1 with an open top and a top cover 2. An isostatic pressure chamber 11 is formed inside the housing 1, and the top cover 2 covers the upper end of the housing 1 to seal the isostatic pressure chamber 11.

[0033] In this embodiment, a cylindrical body 3 is disposed within the isostatic chamber 11. The lower end of the cylindrical body 3 is closed, and the upper end of the cylindrical body 3 is open. Several perforations are provided on the side of the cylindrical body 3. An all-solid-state battery 4 is placed inside the cylindrical body 3. During the preparation process, the high-pressure medium in the isostatic chamber 11 can flow into the cylindrical body 3 through the perforations and fill the area around the all-solid-state battery 4. Further, the cylindrical body 3 includes a left half 31, an insulating spacer 32, and a right half 33, which are connected in sequence. Clamps 5 for electrically connecting to the tabs of the all-solid-state battery 4 are respectively provided on the left half 31 and the right half 33. The left half 31 is electrically connected to the upper cover 2, and the right half 33 is electrically connected to the housing 1. An insulating sealing ring 6 is provided between the housing 1 and the upper cover 2. The insulating sealing ring 6 can prevent short circuits between the housing 1 and the upper cover 2.

[0034] During the isostatic pressing process, the all-solid-state battery 4 is powered by an external power source. For example, the positive terminal of the all-solid-state battery 4 is led out through the clamp 5, the left half 31, and the top cover 2, while the negative terminal of the all-solid-state battery 4 is led out through the clamp 5, the right half 33, and the casing 1. (See [reference]) Figure 4 This method can be used for in-situ formation. Of course, this method is also applicable to testing the cycle performance of all-solid-state batteries under high pressure, and has good applicability.

[0035] It should be noted that in this design, the housing 1, the top cover 2, the left half 31, and the right half 33 are all made of conductive material. Power interfaces (not shown in the figure) are provided on the housing 1 and the top cover 2 to facilitate external power supply. The high-voltage medium is not conductive.

[0036] Example 2: Figure 3 and Figure 5 As shown, the rest of the parts are the same as in Embodiment 1, except that the clamp 5 includes a wire 51 and a conductive clamp 52. One end of the wire 51 is connected to the left half 31 or the right half 33, and the other end of the wire 51 is connected to the conductive clamp 52. The conductive clamp 52 is used to clamp the tabs of the all-solid-state battery 4.

[0037] In this embodiment, the conductive clamp 52 includes a mounting plate 521, on which two side plates 522 are integrally provided, forming a clamping space between the two side plates 522. One side plate 522 is provided with a screw hole 523 and a bolt 524. The tab of the all-solid-state battery 4 extends into the clamping space. After the bolt 524 passes through the screw hole 523, it cooperates with the other side plate 522 to clamp the tab of the all-solid-state battery 4. The structure is simple, easy to operate, and has good clamping stability.

[0038] Example 3: Figure 2 , Figure 3 and Figure 6 As shown, the rest of the components are the same as in Embodiment 1, except that multiple cylinders 3 are provided, distributed vertically. All left halves 31 are stacked sequentially from bottom to top, and all right halves 33 are stacked sequentially from bottom to top. The top left half 31 is electrically connected to the top cover 2, and the bottom right half 33 is electrically connected to the shell 1. Since the space inside each cylinder 3 is independent, there is no interference between the solid-state batteries 4 inside different cylinders 3. Multiple solid-state batteries 4 can be processed at once in each operation, greatly improving processing efficiency.

[0039] In this embodiment, the lower end face of the cylinder 3 is provided with several positioning grooves 34, and the upper end of the cylinder 3 is provided with several positioning blocks 35. The positioning blocks 35 on the lower side of the cylinder 3 are inserted into the positioning grooves 34 on the upper side of the cylinder 3. By adding positioning grooves 34 and positioning blocks 35, the stability of stacking cylinders 3 is improved. Furthermore, the lower end face of the left half 31 is provided with one positioning groove 34, and the upper end face of the left half 31 is provided with one positioning block 35. The lower end face of the right half 33 is provided with two positioning grooves 34, and the upper end face of the right half 33 is provided with two positioning blocks 35. The number of positioning blocks on the left half 31 and the right half 33 is different, which has a foolproof function and avoids misplacement when stacking by workers, thus improving safety.

[0040] Example 4: Figures 7 to 9 As shown, the rest of the components are the same as in Embodiment 3, except that a first insulating layer 7 is provided between the uppermost cylinder 3 and the top cover 2. The first insulating layer 7 has a first through hole 71 and a first conductive element 72. The left half 31 is electrically connected to the top cover 2 through the first conductive element 72. A second insulating layer 8 is provided between the lowermost cylinder 3 and the shell 1. The second insulating layer 8 has a second through hole 81 and a second conductive element 82. The right half 33 is electrically connected to the inner bottom surface of the shell 1 through the second conductive element 82. The first insulating layer 7 and the second insulating layer 8 can prevent direct contact between the positive and negative electrodes from causing a short circuit, thereby reducing the risk of failure.

[0041] Preferably, the first conductive element 72 and the second conductive element 82 are conductive springs. Conductive springs have advantages such as good electrical conductivity, excellent mechanical properties, strong adaptability, and high durability, ensuring a stable and continuous electrical connection between the left half 31 and the upper cover 2, and between the right half 33 and the housing 1. Of course, the first conductive element 72 and the second conductive element 82 can also be conductive metal rods.

[0042] In actual operation, the all-solid-state battery 4 is first placed into the cylinder 3 and the positive and negative electrodes of the all-solid-state battery 4 are fixed. Then, the cylinder 3 is stacked into the isostatic pressure chamber 11 and the isostatic pressure chamber 11 is sealed by the top cover 2. Then, an external power supply is connected, appropriate temperature and pressure parameters are set, and the isostatic pressure equipment is started. During the isostatic pressure process, the all-solid-state battery 4 is subjected to uniform pressure and temperature, and in-situ formation is achieved to generate a stable and complete SEI film, which helps to improve the utilization rate of active materials and interface compatibility of the battery.

[0043] It should be noted that the aforementioned insulating spacer 32, insulating sealing ring 6, first insulating layer 7, and second insulating layer 8 can be made of commonly available insulating materials such as glass fiber reinforced plastic (GRP), silicone rubber, fiber reinforced plastic (FRP), polyethylene, polyvinyl chloride, polypropylene, ceramics, glass, and polymer composite materials. The specific choice depends on the usage environment, and will not be elaborated here.

[0044] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An isostatic pressure device for an all-solid-state battery, comprising a housing (1) with an open upper end and a top cover (2), wherein an isostatic pressure chamber (11) is formed within the housing (1), and the top cover (2) covers the upper end of the housing (1), characterized in that: The isostatic chamber (11) is provided with a cylindrical body (3), and the cylindrical body (3) contains a solid-state battery (4). The cylindrical body (3) includes a left half (31), an insulating strip (32), and a right half (33). The left half (31), the insulating strip (32), and the right half (33) are connected in sequence. The left half (31) and the right half (33) are respectively provided with clamps (5) for electrically connecting with the tabs of the solid-state battery (4). The left half (31) is electrically connected to the top cover (2), and the right half (33) is electrically connected to the housing (1). An insulating sealing ring (6) is provided between the housing (1) and the top cover (2).

2. The isostatic pressure device for an all-solid-state battery according to claim 1, characterized in that: The clamp (5) includes a wire (51) and a conductive clamp (52). One end of the wire (51) is connected to the left half (31) or the right half (33), and the other end of the wire (51) is connected to the conductive clamp (52). The conductive clamp (52) is used to clamp the tabs of the all-solid-state battery (4).

3. The isostatic pressure device for an all-solid-state battery according to claim 2, characterized in that: The conductive clamp (52) includes a mounting plate (521), on which two side plates (522) are integrally provided, forming a clamping space between the two side plates (522). One side plate (522) is provided with a screw hole (523) and a bolt (524). The tab of the all-solid-state battery (4) extends into the clamping space. After the bolt (524) passes through the screw hole (523), it cooperates with the other side plate (522) to clamp the tab of the all-solid-state battery (4).

4. The isostatic pressure device for an all-solid-state battery according to claim 1, characterized in that: Multiple cylinders (3) are provided, and the multiple cylinders (3) are distributed in the vertical direction. All the left halves (31) are stacked sequentially from bottom to top, and all the right halves (33) are stacked sequentially from bottom to top. The left halves (31) at the top layer are electrically connected to the top cover (2), and the right halves (33) at the bottom layer are electrically connected to the shell (1).

5. The isostatic pressure device for an all-solid-state battery according to claim 4, characterized in that: The lower end face of the cylinder (3) is provided with a plurality of positioning grooves (34), and the upper end of the cylinder (3) is provided with a plurality of positioning blocks (35). The positioning blocks (35) on the lower side of the cylinder (3) are inserted into the positioning grooves (34) on the upper side of the cylinder (3).

6. The isostatic pressure device for an all-solid-state battery according to claim 5, characterized in that: The lower end face of the left half (31) is provided with a positioning groove (34), the upper end face of the left half (31) is provided with a positioning block (35), the lower end face of the right half (33) is provided with two positioning grooves (34), and the upper end face of the right half (33) is provided with two positioning blocks (35).

7. The isostatic pressure device for an all-solid-state battery according to claim 4, characterized in that: A first insulating layer (7) is provided between the uppermost cylinder (3) and the upper cover (2). The first insulating layer (7) is provided with a first through hole (71) and a first conductive element (72). The left half (31) is electrically connected to the upper cover (2) through the first conductive element (72). A second insulating layer (8) is provided between the bottommost cylinder (3) and the shell (1). The second insulating layer (8) is provided with a second through hole (81) and a second conductive element (82). The right half (33) is electrically connected to the inner bottom surface of the shell (1) through the second conductive element (82).

8. The isostatic pressure device for an all-solid-state battery according to claim 7, characterized in that: The first conductive element (72) and the second conductive element (82) are conductive springs.

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