Battery detection jig

Abstract

The invention belongs to the technical field of lithium battery detection, and particularly relates to a battery detection jig which comprises a frame body, a lower die and an upper die, the upper die and the lower die which are matched in a sealed mode are arranged on the frame body, the upper die is located over the lower die, the upper die is arranged on the frame body through a lifting device, a containing cavity is formed in the center of the upper surface of the lower die, and a supporting table is arranged in the containing cavity. A pressing tongue matched with the lower die is arranged on the lower surface of the upper die, a plurality of grooves are formed in the pressing tongue, the grooves are parallel to the upper surface of the lower die, the two ends of each groove extend out of the pressing tongue, at least two through holes communicated with the containing cavity are formed in the lower die, and when the lower die and the upper die are closed, a preset distance is formed between the lower surface of the pressing tongue and the supporting table; the problem that a battery detection jig used in a method for carrying out leakage detection through a mass spectrometer in a vacuum negative pressure state does not exist at present is solved.

Description

Technical Field

[0001] This application belongs to the field of lithium battery testing technology, specifically a battery testing fixture. Background Technology

[0002] After manufacturing, lithium batteries require testing to ensure they are leak-free. Currently, the primary testing method uses inert gas. This involves fixing the lithium battery in a sealed device, dividing the space into two halves: one half filled with inert gas, and the other half under negative pressure. The negative pressure is then used to test the inert gas level. Detection of inert gas indicates a leak, while the absence of inert gas indicates no leak. However, inert gas is expensive, increasing testing costs. The inventors have developed a method for testing lithium batteries that does not rely on inert gas, thus requiring the design of a separate fixture for detecting leaks. Summary of the Invention

[0003] The purpose of this application is to address the shortcomings of existing technologies by designing a battery testing fixture using a grooved pressure tongue on an upper mold in conjunction with a lower mold having a placement cavity. This fixture is designed to enable leakage detection by mass spectrometry under vacuum negative pressure conditions, thus solving the problem that there is currently no battery testing fixture available for leakage detection by mass spectrometry under vacuum negative pressure conditions.

[0004] The above-mentioned technical objective of this application is achieved through the following technical solution: A battery testing fixture includes a frame, a lower mold, and an upper mold. The frame is provided with an upper mold and a lower mold that are sealed to each other. The upper mold is located directly above the lower mold and is mounted on the frame via a lifting device. The lower mold has a placement cavity in the center of its upper surface, and a support platform is provided inside the placement cavity. The lower surface of the upper mold has a pressure tongue that cooperates with the lower mold. The pressure tongue has several grooves that are parallel to the upper surface of the lower mold and extend to the outside of the pressure tongue at both ends. The lower mold has at least two through holes that communicate with the placement cavity. When the lower mold and the upper mold are closed, there is a preset distance between the lower surface of the pressure tongue and the support platform.

[0005] Preferably, a sealing ring is provided on the lower mold outside the placement cavity.

[0006] Preferably, the placement cavity is provided with at least two through holes, one end of which is connected to the placement cavity and the other end extends to the outside of the lower mold, and a filter screen is provided at each of the through holes in the placement cavity.

[0007] Preferably, an on / off valve assembly is provided on the outer surface of the lower mold at the through hole.

[0008] Preferably, the support platform is in close contact with the inner wall of the placement cavity, and there is a preset distance between the through hole and the support platform.

[0009] Preferably, the lifting device is a cylinder, and the free end of the cylinder is fixedly connected to the upper mold.

[0010] Preferably, the distance between the right side of the through hole located on the left side of the placement cavity and the left inner wall of the placement cavity is greater than the distance between the right side of the support platform located on the left side of the placement cavity and the left inner wall of the placement cavity.

[0011] The beneficial effects of this application are: This application designs a battery testing fixture by using a grooved pressure tongue on an upper mold in conjunction with a lower mold having a placement cavity. This allows the fixture to be adapted for leakage detection by mass spectrometry under vacuum negative pressure, solving the problem that there is currently no battery testing fixture available for leakage detection by mass spectrometry under vacuum negative pressure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural schematic diagram showing the lower surface of the upper mold in this application; Figure 3 This is a schematic diagram of the lower mold structure in this application; Figure 4 This is a cross-sectional view of the lower mold in this application.

[0013] The components include: 1. frame; 2. lower mold; 3. upper mold; 4. placement cavity; 5. support platform; 6. pressure tongue; 7. groove; 8. through hole; 9. sealing ring; 10. filter screen; 11. cylinder; 12. opening and closing valve group; and 13. lithium battery. Detailed Implementation

[0014] like Figure 1-4As shown, a battery testing fixture includes a frame 1, a lower mold 2, and an upper mold 3. The frame 1 is provided with an upper mold 3 and a lower mold 2 that are sealed to each other. The upper mold 3 is located directly above the lower mold 3 and is mounted on the frame 1 via a lifting device. The lower mold 2 has a placement cavity 4 in the center of its upper surface, and a support platform 5 is provided inside the placement cavity 4. The lower surface of the upper mold 3 has a pressure tongue 6 that cooperates with the lower mold 2. The pressure tongue 6 has several grooves 7 that are parallel to the upper surface of the lower mold 2 and extend to the outside of the pressure tongue 6 at both ends. The lower mold 2 has at least two through holes 8 that communicate with the placement cavity 4. When the lower mold 2 and the upper mold 3 are closed, there is a preset distance between the lower surface of the pressure tongue 6 and the support platform 5.

[0015] In this embodiment, during use, the lithium battery 13 is placed on the support platform 5 inside the placement cavity 4. Then, the through hole 8 on the lower mold 2 is connected to the negative pressure device, which creates a cavity inside the placement cavity 4. A mass spectrometer is then placed at the negative pressure device to detect whether electrolyte flows out of the lithium battery 13 under negative pressure. During use, the upper mold 3 and the lower mold 2 are closed, forming a sealed cavity in the placement cavity 4. The pressure tongue 6 acts to hold the lithium battery 13 in place. The groove 7 on the pressure tongue 6 is designed so that the portion of the lithium battery 13 located in the groove 7 is also subjected to negative pressure. This design ensures that the lithium battery 13 is fixed even when subjected to negative pressure, i.e., it is held by the pressure tongue 6 and the support platform 5. When the lower mold 2 and the upper mold 3 are closed, the preset distance between the lower surface of the pressure tongue 6 and the support platform 5 is mainly to reserve space for placing the lithium battery 13 during mold closing.

[0016] As a preferred embodiment, the lower mold 2 is provided with a sealing ring 9 around the placement cavity 5. By providing the sealing ring 9, the airtightness of the placement cavity 4 is ensured when the upper mold 3 and the lower mold 2 are engaged.

[0017] As a preferred embodiment, the placement cavity 4 is provided with at least two through holes 8, one end of which connects to the placement cavity 4 and the other end extends to the outside of the lower mold 2. A filter screen 10 is provided at each of the through holes 8 within the placement cavity 4. By providing two through holes 8, it is convenient to connect several lower molds 2 in series simultaneously and then perform testing under the action of a negative pressure device.

[0018] As a preferred embodiment, an on / off valve assembly 12 is provided on the outer surface of the lower mold 2 at the through hole 8. By providing the on / off valve assembly 12, it is convenient to control the connection and disconnection of the placement cavity 4.

[0019] As a preferred embodiment, the support platform 5 is closely attached to the inner wall of the placement cavity 4, and a predetermined distance is maintained between the through hole 8 and the support platform 5. This arrangement ensures that the support platform 5 does not obstruct the flow of the electrolyte of the lithium battery 13 from the through hole 8 into the negative pressure device for mass spectrometry detection.

[0020] As a preferred embodiment, the lifting device is a cylinder 11, and the free end of the cylinder 11 is fixedly connected to the upper mold 3.

[0021] As a preferred embodiment, the distance between the right side of the through hole 8 located on the left side of the placement cavity 4 and the left inner wall of the placement cavity 4 is greater than the distance between the right side of the support platform 5 located on the left side of the placement cavity 4 and the left inner wall of the placement cavity 4. This arrangement prevents the through hole 8 from overlapping with the support platform 5, thus avoiding the lithium battery 13 blocking the through hole 8 after placement.

Claims

1. A battery testing fixture, characterized in that, The device includes a frame (1), a lower mold (2), and an upper mold (3). The frame (1) is provided with an upper mold (3) and a lower mold (2) that are sealed together. The upper mold (3) is located directly above the lower mold (3). The upper mold (3) is set on the frame (1) by a lifting device. The lower mold (2) has a placement cavity (4) in the center of its upper surface. The placement cavity (4) has a support platform (5). The lower surface of the upper mold (3) has a pressure tongue (6) that cooperates with the lower mold (2). The pressure tongue (6) has several grooves (7) that are parallel to the upper surface of the lower mold (2). The two ends of the grooves (7) extend to the outside of the pressure tongue (6). The lower mold (2) has at least two through holes (8) that communicate with the placement cavity (4). When the lower mold (2) and the upper mold (3) are closed, there is a preset distance between the lower surface of the pressure tongue (6) and the support platform (5).

2. The battery testing fixture according to claim 1, characterized in that: A sealing ring (9) is provided on the lower mold (2) outside the placement cavity (5).

3. The battery testing fixture according to claim 1, characterized in that: The placement cavity (4) is provided with at least two through holes (8), one end of the through hole (8) is connected to the placement cavity (4), and the other end extends to the outside of the lower mold (2). A filter screen (10) is provided in each of the through holes (8) in the placement cavity (4).

4. The battery testing fixture according to claim 1, characterized in that: On the outer surface of the lower mold (2), an on / off valve assembly (12) is provided at the through hole (8).

5. A battery testing fixture according to claim 1, characterized in that: The support platform (5) is close to the inner wall of the placement cavity (4), and there is a preset distance between the through hole (8) and the support platform (5).

6. A battery testing fixture according to claim 1, characterized in that: The lifting device is a cylinder (11), and the free end of the cylinder (11) is fixedly connected to the upper mold (3).

7. A battery testing fixture according to claim 1, characterized in that: The distance between the right side of the through hole (8) located on the left side of the placement cavity (4) and the left inner wall of the placement cavity (4) is greater than the distance between the right side of the support platform (5) located on the left side of the placement cavity (4) and the left inner wall of the placement cavity (4).

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