Pressure maintaining clamp and testing device for solid-state soft package battery

Abstract

The utility model discloses a solid soft package battery pressure maintaining clamp and a testing device, the solid soft package battery pressure maintaining clamp comprises a frame body assembly, a pressurization assembly and a clamping assembly used for limiting a battery cell, the pressurization assembly is arranged in the frame body assembly in a sliding mode, and the clamping assembly is placed in the frame body assembly and arranged below the telescopic end of the pressurization assembly; the pressurizing assembly comprises a restraining module and pressure rods, a plurality of separable square blocks are arranged in the restraining module, the square blocks are connected in a sliding mode through the top plate, one pressure rod is fixed to each square block through a screw, and the clamping assembly is placed on the bottom plate and arranged below the pressure rods; according to the pressure maintaining clamp, the pressure maintaining performance and the stress uniformity of the battery cell are achieved, and then the testing accuracy of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery preparation, in particular to a pressure-maintaining fixture and a testing device for a solid-state soft-pack battery. Background Art

[0002] All-solid-state battery technology is developing day by day, and corresponding all-solid-state battery testing also has technical requirements. Compared with the solid-liquid contact of liquid batteries, the solid-solid contact test of all-solid-state batteries is more difficult. During the test, a force of 100-200Mpa needs to be applied to the battery cell to ensure the path of ion transmission.

[0003] From the earliest mold batteries to today's large soft-pack solid-state batteries, the requirements for test molds are getting higher and higher. The test tooling has increased in size in tandem with the area of ​​the all-solid-state soft-pack battery cells, which has also brought many inconveniences. The larger the volume, the heavier the tooling, and the more complex and laborious the operation. Improvements to the test tooling for all-solid-state soft-pack batteries are imminent.

[0004] The all-solid-state soft-pack battery cycle process requires a pressure of 100-200Mpa. Traditional test fixtures are tightened and pressurized by screws. In order to achieve the required pressure, the fixtures are often made larger, which is very complicated and laborious for personnel to operate. There are also many problems in the transfer of the fixtures.

[0005] The all-solid-state soft-pack battery being tested is relatively large, which results in a test clamp area that is also too large. During the process of applying force, it is easy to cause differences in force at different positions, affecting the test performance of the battery cell. Utility Model Content

[0006] Based on the technical problems existing in the background technology, the utility model proposes a pressure-maintaining fixture and a testing device for solid-state soft-pack batteries, which achieve pressure maintenance and force uniformity, thereby improving the testing accuracy of the battery cells.

[0007] The utility model proposes a pressure-maintaining fixture for a solid-state soft-pack battery, comprising a frame assembly, a pressurizing assembly and a clamping assembly for limiting the position of a battery cell, wherein the pressurizing assembly is slidably arranged in the frame assembly, and the clamping assembly is placed in the frame assembly and arranged below the telescopic end of the pressurizing assembly.

[0008] Furthermore, the frame assembly includes a bottom plate, a top plate and a support plate, and the bottom plate and the top plate are arranged opposite to each other and fixed by the support plate.

[0009] Furthermore, the pressurizing component includes a restraint module and a pressure rod. A plurality of detachable square blocks are arranged in the restraint module. Each square block is slidably connected through a top plate. A pressure rod is fixed to each square block by screws. The clamping component is placed on the bottom plate and arranged below the pressure rod.

[0010] Furthermore, a threaded hole is provided on the top plate, one end of a screw passes through the threaded hole and is screwed to the square block, and the screw is rotated by a wrench to make the square block move up and down.

[0011] Furthermore, a threaded hole is provided on the top plate, one end of the screw is connected to the motor, and the other end passes through the threaded hole and is threadedly connected to the square block.

[0012] Furthermore, the clamping assembly includes an upper clamping plate and a lower clamping plate hinged to the upper clamping plate, and the battery cell is arranged between the upper clamping plate and the lower clamping plate.

[0013] A testing device for solid-state soft-pack batteries comprises a testing fixture, wherein the testing fixture adopts the pressure-maintaining fixture described above.

[0014] The advantages of a pressure-maintaining fixture and a testing device for a solid-state soft-pack battery provided by the utility model are as follows: the pressure-maintaining fixture reduces the size of the tooling and can be operated by one person; the operation can be easily completed by an electric torque wrench, a motor, or a telescopic cylinder, thereby reducing the operating burden on personnel; the consistency and uniformity of force are improved by means of a pressure-applying component; the pressure-applying component adopts a split design, and the upper limit of the applied pressure can be changed by adjusting multiple square blocks. The more square blocks there are (the more pressure rods there are), the smaller the force required for a single square block, and the more uniform the overall force distribution is. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a structural diagram of the restraint module;

[0017] Figure 3 is a schematic diagram of the structure of the clamping assembly;

[0018] Among them, 1-frame assembly, 2-pressurizing assembly, 3-clamping assembly, 4-battery cell, 11-bottom plate, 12-top plate, 13-support plate, 14-threaded hole, 21-restraint module, 22-pressure rod, 23-square block, 31-upper clamping plate, 32-lower clamping plate. DETAILED DESCRIPTION

[0019] Below, the technical solution of the utility model is described in detail through specific embodiments. Many specific details are described in the following description to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific implementation disclosed below.

[0020] like Figure 1As shown, the utility model proposes a pressure-maintaining fixture for a solid-state soft-pack battery, comprising a frame assembly 1, a pressurizing assembly 2 and a clamping assembly 3 for limiting the battery cell 4, the pressurizing assembly 2 is slidably arranged in the frame assembly 1, the clamping assembly 3 is placed in the frame assembly 1 and arranged below the telescopic end of the pressurizing assembly 2.

[0021] When the solid-state battery cell 4 is tested, it is necessary to apply continuous and stable pressure to ensure the transmission path during the test. Therefore, this embodiment improves the pressure instability during the existing solid-state battery cell test. First, the battery cell 4 is clamped by the clamping component 3, wherein the clamping component 3 is provided with a layer of buffer pad on the side attached to the battery cell 4 to avoid the defect of the surface of the battery cell 4 being scratched during the pressurization process of the battery cell 4. Then, the battery cell 4 after being limited is stably pressurized by the pressurization component 2, thereby avoiding the problem of uneven force on the battery cell 4.

[0022] Among them, the frame assembly 1 includes a bottom plate 11, a top plate 12 and a support plate 13. The bottom plate 11 and the top plate 12 are arranged relatively to each other and fixed by the support plate 13. The frame assembly 1 provides a frame structure for maintaining the pressure of the battery cell and structurally fixes the pressurizing assembly 2 and the clamping assembly 3.

[0023] In this embodiment, the pressurizing component 2 includes a restraint module 21 and a pressure rod 22. A plurality of detachable square blocks 23 are arranged in the restraint module 21. Each square block 23 is slidably connected through the top plate 12. A pressure rod 22 is fixed to each square block 23 by screws, so that the force is evenly distributed to different square blocks 23, which improves the uniformity and the ease of operation. The clamping component 3 is placed on the bottom plate 11 and arranged below the pressure rod 22.

[0024] The pressurizing component 2 adopts a split design. The upper limit of the applied pressure can be changed by adjusting multiple square blocks 23. The more square blocks 23 there are (the pressure rods 22 also increase accordingly), the smaller the force required for a single square block 23, and the more uniform the overall force distribution.

[0025] The restraint module 21 is made of steel plate, and includes a frame structure and a plurality of square blocks 23. The direction block 23 is arranged in the frame structure and can move up and down in the frame structure. The frame structure restrains the plurality of square blocks 23 in a space. On the one hand, it is convenient to control the height difference of the up and down movement of all the square blocks 23. On the other hand, the frame structure can limit the movement of the square blocks 23 to prevent the square blocks 23 from moving too far downward, causing the pressure rod 22 to exert too much pressure on the battery cell 4, thereby causing the battery cell 4 to have structural damage defects.

[0026] For the up and down movement of the pressure rod 22, this embodiment discloses two methods. One method is to manually use an electric wrench to realize the up and down movement of the pressure rod 22. Specifically, a threaded hole 14 is opened on the top plate 12, one end of the screw passes through the threaded hole 14 and is screwed to the square block 23, and the screw is rotated by the electric wrench to make the square block 23 move up and down. In this method, it is necessary to manually rotate the screw corresponding to each square block 23 in turn by using an electric wrench, so that the pressure rod 22 above the clamping assembly 3 moves one by one to a position where it abuts against the clamping assembly 3 and has a certain pressure. This method ensures both the consistency and uniformity of force.

[0027] Another way is to mechanically realize the up and down movement of the pressure rod 22, specifically: a threaded hole 14 is opened on the top plate 12, one end of the screw is connected to the motor, and the other end passes through the threaded hole 14 and is screwed to the square block 23, and the up and down movement of each square block 23 is realized by the motor set on the top plate 12, thereby realizing mechanized control. In addition, a telescopic cylinder can also be set, and the telescopic end of the telescopic cylinder passes through the avoidance hole opened in the top plate 12 and is fixedly connected to the square block 23, and the up and down movement of the square block 23 is realized through the telescopic movement of the telescopic cylinder, thereby realizing the control of the up and down movement of the pressure rod 22, and at the same time, this method also ensures both the consistency and uniformity of the force.

[0028] In this embodiment, the clamping assembly 3 includes an upper clamping plate 31 and a lower clamping plate 32 hinged to the upper clamping plate 31, and the battery cell 4 is arranged between the upper clamping plate 31 and the lower clamping plate 32. By setting the clamping assembly 3, on the one hand, the battery cell 4 can be clamped and fixed, and on the other hand, the defect of uneven force caused by local force on the battery cell 4 can be avoided. In order to solve the force problem of the clamping assembly 3, the upper clamping plate 31 bears a larger force and the thickness needs to be ≥15mm, while the lower clamping plate 32 only needs 5mm.

[0029] Working process: first, the battery cell is limited by the clamping assembly 3 and placed on the bottom plate 11. The screws corresponding to each square block 23 are manually rotated by an electric wrench or the motor drives the screw to rotate, so that the square block 23 moves downward, thereby driving the pressure rod 22 to move toward the position of the battery cell 4, thereby pressurizing the battery cell 4. When the battery cell 4 reaches the set pressure value, it stops working and the pressure rod 22 maintains the current state until the battery cell test is completed. A pressure sensor can be set at the bottom of the pressure rod 22. The pressure of the pressure rod 22 on the clamping assembly 3 is detected in real time by the pressure sensor to set the movement distance of the pressure rod 22, so that the force on the battery cell 4 is uniform and consistent.

[0030] This embodiment has the following advantages:

[0031] 1. Reduce the operating burden of personnel (the existing pressurized test tooling is pressurized by screws around the periphery. When the test soft bag area is too large, the screws around the periphery need to bear very large torque, which may not reach the design value. In addition, the operator cannot operate with a torque wrench and needs to be assisted by equipment. The overall operation is complicated. This patent can easily complete the operation through an electric torque wrench, a motor, or a telescopic cylinder);

[0032] 2. Reduce the volume of the fixture (the existing test tooling requires a large pressure, and the overall volume of the pressurization work is large to withstand the large pressure. The fixture transfer requires multiple people to operate at the same time. This patent reduces the volume of the tooling and can be operated by one person);

[0033] 3. Further improve the force uniformity (the conventional pressurizing module is tightened and pressurized by screws on all sides, and the force is transmitted from all sides, which is very easy to deviate. This patent improves the consistency and uniformity of force by means of the pressurizing component 2)

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure-maintaining fixture for a solid-state soft-pack battery, characterized in that: The invention comprises a frame assembly (1), a pressurizing assembly (2) and a clamping assembly (3) for limiting the position of an electric core (4); the pressurizing assembly (2) is slidably arranged in the frame assembly (1); and the clamping assembly (3) is placed in the frame assembly (1) and arranged below the telescopic end of the pressurizing assembly (2).

2. The pressure-maintaining fixture for solid-state soft-pack batteries according to claim 1, characterized in that: The frame assembly (1) comprises a bottom plate (11), a top plate (12) and a support plate (13); the bottom plate (11) and the top plate (12) are arranged relative to each other and fixed by the support plate (13).

3. The pressure-maintaining fixture for solid-state soft-pack batteries according to claim 2, characterized in that: The pressurizing component (2) comprises a restraining module (21) and a pressure rod (22). A plurality of detachable square blocks (23) are arranged in the restraining module (21). Each square block (23) is slidably connected via a top plate (12). A pressure rod (22) is fixed to each square block (23) via screws. The clamping component (3) is placed on the bottom plate (11) and arranged below the pressure rod (22).

4. The pressure-maintaining fixture for solid-state soft-pack batteries according to claim 3, characterized in that: The top plate (12) is provided with a threaded hole (14), one end of a screw passes through the threaded hole (14) and is screwed to the square block (23), and the square block (23) is moved up and down by rotating the screw with an electric wrench.

5. The pressure-maintaining fixture for solid-state soft-pack batteries according to claim 3, characterized in that: A threaded hole (14) is provided on the top plate (12); one end of the screw rod is connected to the motor, and the other end passes through the threaded hole (14) and is threadedly connected to the square block (23).

6. The pressure-maintaining fixture for solid-state soft-pack batteries according to claim 3, characterized in that: The clamping assembly (3) comprises an upper clamping plate (31) and a lower clamping plate (32) hinged to the upper clamping plate (31), and the battery core (4) is arranged between the upper clamping plate (31) and the lower clamping plate (32).

7. A testing device for a solid-state soft-pack battery, comprising a testing fixture, wherein the testing fixture is a pressure-maintaining fixture as described in any one of claims 1 to 6.

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