Density measurement mechanism and battery detection equipment

Abstract

The utility model belongs to the technical field of battery manufacturing equipment, and particularly relates to a density measuring mechanism and battery detection equipment, and the density measuring mechanism comprises a support frame, a first driving member, a second driving member, a hook, a first support member, and a first joint and a second joint which are installed on the first support member. The first driving piece is installed on the supporting frame and connected with the first supporting piece. The second driving piece is installed on the first supporting piece and connected with the hook. The first driving piece is used for driving the first connector and the second connector to be in butt joint with a first valve hole and a second valve hole of the switching valve through the first supporting piece, and the first valve hole communicates with an inner cavity of the battery body; and the second driving piece is used for driving the valve rod of the switching valve to move through the hook, so that the second valve hole or the first valve hole is communicated with an internal space for mounting the battery jig. The sealing performance of the battery body and the battery jig can be detected by the sealing mechanism, and the sealing precision is high.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing equipment technology, and in particular relates to a density measuring mechanism and battery testing equipment. Background Technology

[0002] In the manufacturing process of electronics, the battery body needs to be installed inside the battery casing, and after the electrolyte is injected into the battery casing, it also needs to undergo processes such as settling and formation. When the battery is in the settling state, it needs to be placed inside a fixture, and the positive and negative pressures inside the battery and inside the fixture need to be kept equal. When the battery is in the formation state, the inside of the battery needs to be adjusted to a negative pressure state, and the outside of the battery needs to be adjusted to a positive pressure state.

[0003] To ensure stability during battery vacuuming, the fixture needs to be tested for tightness to guarantee its airtightness. In existing technologies, testing equipment is typically used to detect the fixture's airtightness through vacuuming. However, existing testing equipment usually only detects the airtightness of the fixture itself, not the airtightness of the battery cell within it. Summary of the Invention

[0004] The present invention addresses the technical problem that existing pressure testing devices can typically only detect the sealing of fixtures, but cannot detect the battery body inside the fixture, by providing a pressure testing mechanism and a battery testing device.

[0005] To address the above problems, the first embodiment of this utility model provides a sealing mechanism for measuring the sealing performance of a battery fixture on which a battery body is mounted. The battery fixture is equipped with a switching valve and includes a support frame, a first driving component, a second driving component, a hook, a first support component, and a first connector and a second connector, both mounted on the first support component. The first driving component is mounted on the support frame and connected to the first support component; the second driving component is mounted on the first support component and connected to the hook.

[0006] The first driving member is used to drive the first connector and the second connector to dock with the first valve hole and the second valve hole of the switching valve respectively through the first support member. The first valve hole communicates with the inner cavity of the battery body.

[0007] The second driving member is used to move the valve stem of the switching valve through the hook, so that the second valve hole or the first valve hole connects to the internal space for mounting the battery fixture.

[0008] Optionally, the first support member includes a first guide rod, a first carrier plate, and a second carrier plate with a through hole; the second drive member is mounted on the second carrier plate and connected to the first carrier plate; one end of the first guide rod is mounted on the first carrier plate, and the other end of the first guide rod passes through the through hole and is connected to the hook; both the first connector and the second connector are mounted on the second carrier plate, and the output end of the first drive member is connected to the second carrier plate.

[0009] Optionally, the first support member further includes a third carrier plate with a first guide hole and a sliding assembly. The third carrier plate is mounted on the second carrier plate via the sliding assembly, and the second drive member is mounted on the end of the third carrier plate away from the sliding assembly. The end of the first guide rod away from the first carrier plate passes through the first guide hole and the through hole in sequence and is then connected to the hook.

[0010] The density measuring mechanism further includes a third driving member mounted on the second carrier plate and connected to the third carrier plate; the direction in which the third driving member drives the third carrier plate to move is perpendicular to the direction in which the second carrier plate drives the first carrier plate to move.

[0011] Optionally, the sliding assembly includes a first guide rail mounted on the second carrier plate and a first slider mounted on the third carrier plate, wherein the first slider is slidably connected to the first guide rail.

[0012] Optionally, the support frame is provided with a second guide hole, and the density measuring mechanism further includes a second guide rod connected to the first support member, the second guide rod being slidably inserted into the second guide hole.

[0013] Optionally, the density measuring mechanism further includes a second support member, the first driving member is connected to the second support member, and the second support member is equipped with a plurality of hooks spaced apart;

[0014] The density measuring mechanism includes a plurality of connector assemblies spaced apart on the first support member, each connector assembly including a first connector and a second connector; the hooks are configured in a one-to-one correspondence with the connector assemblies.

[0015] Optionally, the density measuring mechanism further includes a first density measuring component and a second density measuring component, both mounted on the support frame, wherein the first density measuring component is connected to the first connector and the second density measuring component is connected to the second connector.

[0016] Another embodiment of this utility model also provides a battery testing device, including a switching valve, a battery fixture, and the aforementioned density measuring mechanism;

[0017] The switching valve includes a valve stem and a valve seat installed in the battery fixture. The valve seat is provided with a first valve hole, a second valve hole, a first channel, and a control hole. The valve stem is slidably installed in the control hole. The first valve hole and the second valve hole are both connected to the first channel through the control hole. The valve stem is used to control the first valve hole or the second valve hole to connect to the first channel.

[0018] The battery fixture is provided with a second channel, a third channel, and an internal space for mounting the battery body; the first valve hole is connected to the inner cavity of the battery body through the second channel, and the first channel is connected to the internal space through the third channel.

[0019] Optionally, the first valve hole, the first channel, and the second valve hole are connected to the control hole through a first opening, a second opening, and a third opening, respectively, and the first opening, the second opening, and the third opening are sequentially spaced along the axial direction of the control hole;

[0020] The valve stem is provided with a sealing part;

[0021] When the sealing part slides between the first opening and the second opening, the second valve hole sequentially connects to the internal space through the control hole, the first channel and the third channel;

[0022] When the sealing part slides between the second opening and the third opening, the first valve hole sequentially connects to the internal space through the control hole, the first channel and the third channel.

[0023] Optionally, the valve stem is provided with a hook groove located outside the control hole, and the hook drives the valve stem to move in the control hole through the hook groove.

[0024] Optionally, the valve stem is provided with a first magnetic attraction part at the end away from the hook groove, and the valve seat is also provided with a second magnetic attraction part disposed opposite to the first magnetic attraction part.

[0025] In this utility model, the first driving member drives the first connector and the second connector to move downward through the first support member. The first connector and the second connector are respectively connected to the first valve hole and the second valve hole of the switching valve. The first valve hole is always connected to the inner cavity of the battery body. The second driving member drives the hook to rise and fall. The hook can drive the valve stem of the switching valve to move. The valve stem can drive the second valve hole or the first valve hole to connect to the internal space of the battery fixture.

[0026] When the first valve port is connected to the inner cavity of the battery body and the second valve port is connected to the internal space of the battery fixture, the inner cavity of the battery body can be evacuated to a vacuum state through the first valve port and the internal space of the battery fixture can be evacuated to a vacuum state through the second valve port, thereby allowing the sealing performance of the battery fixture and the battery body to be tested separately.

[0027] When the first valve hole connects the inner cavity of the battery body and the internal space of the battery fixture, the first connector can use the first valve hole to draw the inner cavity of the battery body and the internal space of the battery fixture into a vacuum state, thereby simultaneously detecting the sealing performance of the inner cavity of the battery body and the internal space of the battery fixture.

[0028] In this invention, the sealing mechanism can detect the sealing performance of the battery body and the battery fixture, and the sealing accuracy is high. In addition, the sealing mechanism has a compact structure, occupies little space, has a simple structure, and has low manufacturing cost. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of a density measuring mechanism provided in an embodiment of the present invention;

[0031] Figure 2 This is a partial structural schematic diagram of a density measuring mechanism provided in an embodiment of the present invention;

[0032] Figure 3 A cross-sectional view of the battery body and switching valve mounted on a battery fixture according to an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional view of a switching valve provided in one embodiment of the present invention.

[0034] The reference numerals in the accompanying drawings are as follows:

[0035] 1. Detection mechanism; 11. Support frame; 12. First driving component; 13. Second driving component; 14. Hook; 15. First support component; 151. First guide rod; 152. First carrier plate; 153. Second carrier plate; 154. Third carrier plate; 155. Sliding assembly; 16. First connector; 17. Second connector; 18. Third driving component; 19. Second guide rod; 101. Second support component; 102. First detection component; 103. Second detection component;

[0036] 2. Battery body; 21. Inner cavity; 3. Switching valve; 31. Valve stem; 311. Sealing part; 312. Hook groove; 32. Valve seat; 321. First valve hole; 322. Second valve hole; 323. First channel; 324. Control hole; 325. First opening; 326. Second opening; 327. Third opening; 4. Battery fixture; 41. Second channel; 42. Third channel; 43. Internal space. Detailed Implementation

[0037] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0038] It should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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 of this utility model.

[0039] like Figure 1 and Figure 2 As shown in the figure, the present invention provides a sealing mechanism 1 for measuring the sealing performance of a battery fixture 4 on which a battery body 2 is mounted. The battery fixture 4 is equipped with a switching valve 3. The sealing mechanism 1 includes a support frame 11, a first driving member 12, a second driving member 13, a hook 14, a first support member 15, and a first connector 16 and a second connector 17 both mounted on the first support member 15. The first driving member 12 is mounted on the support frame 11 and connected to the first support member 15. The second driving member 13 is mounted on the first support member 15 and connected to the hook 14. It can be understood that the first driving member 12 and the second driving member 13 include, but are not limited to, pneumatic cylinders, hydraulic cylinders, and linear motors.

[0040] The first driving member 12 is used to drive the first connector 16 and the second connector 17 to dock with the first valve hole 321 and the second valve hole 322 of the switching valve 3 respectively through the first support member 15. The first valve hole 321 is connected to the inner cavity 21 of the battery body 2. It can be understood that the first driving member 12 is used to drive the first support member 15 to move in the vertical direction.

[0041] The second driving member 13 is used to move the valve stem 31 of the switching valve 3 via the hook 14, so that the second valve hole 322 or the first valve hole 321 connects to the internal space 43 for mounting the battery fixture 4. Understandably, the second driving member 13 is used to drive the hook 14 to move vertically.

[0042] In this utility model, the first driving member 12 drives the first connector 16 and the second connector 17 to move downward through the first support member 15. The first connector 16 and the second connector 17 are respectively connected to the first valve hole 321 and the second valve hole 322 of the switching valve 3. The first valve hole 321 is always connected to the inner cavity 21 of the battery body 2. The second driving member 13 drives the hook 14 to rise and fall. The hook 14 can drive the valve stem 31 of the switching valve 3 to move. The valve stem 31 can drive the second valve hole 322 or the first valve hole 321 to connect to the internal space 43 of the battery fixture 4.

[0043] When the first valve hole 321 is connected to the inner cavity 21 of the battery body 2 and the second valve hole 322 is connected to the internal space 43 of the battery fixture 4, the inner cavity 21 of the battery body 2 can be drawn into a vacuum state through the first valve hole 321 and the internal space 43 of the battery fixture 4 can be drawn into a vacuum state through the second valve hole 322, so that the sealing performance of the battery fixture 4 and the battery body 2 can be tested separately.

[0044] When the first valve hole 321 connects the inner cavity 21 of the battery body 2 and the internal space 43 of the battery fixture 4, the first connector 16 can draw the inner cavity 21 of the battery body 2 and the internal space 43 of the battery fixture 4 into a vacuum state through the first valve hole 321, thereby simultaneously detecting the sealing performance of the inner cavity 21 of the battery body 2 and the internal space 43 of the battery fixture 4.

[0045] In this invention, the sealing mechanism 1 can detect the sealing performance of the battery body 2 and the battery fixture 4, and the sealing accuracy is high. In addition, the sealing mechanism 1 has a compact structure, occupies little space, has a simple structure, and has low manufacturing cost.

[0046] In one embodiment, such as Figure 1 and Figure 2As shown, the first support member 15 includes a first guide rod 151, a first carrier plate 152, and a second carrier plate 153 with a through hole. The second drive member 13 is mounted on the second carrier plate 153 and connected to the first carrier plate 152. One end of the first guide rod 151 is mounted on the first carrier plate 152, and the other end of the first guide rod 151 passes through the through hole and connects to the hook 14. The first connector 16 and the second connector 17 are both mounted on the second carrier plate 153, and the output end of the first drive member 12 is connected to the second carrier plate 153. It can be understood that the first guide rod 151 is installed vertically between the first carrier plate 152 and the hook 14.

[0047] Specifically, the first driving member 12 can drive the first connector 16 and the second connector 17 in the vertical direction through the second carrier plate 153; the first driving member 12 can drive the hook 14 in the vertical direction through the first carrier plate 152 and the first guide rod 151. In this embodiment, the density measuring mechanism 1 has a compact structure and occupies little space.

[0048] In one embodiment, such as Figure 1 and Figure 2 As shown, the first support member 15 further includes a third carrier plate 154 with a first guide hole and a sliding assembly 155. The third carrier plate 154 is mounted on the second carrier plate 153 via the sliding assembly 155. The second drive member 13 is mounted on the end of the third carrier plate 154 away from the sliding assembly 155. The end of the first guide rod 151 away from the first carrier plate 152 passes through the first guide hole and the through hole in sequence and is connected to the hook 14. It can be understood that the sliding assembly 155 includes, but is not limited to, a guide rail slider assembly, a guide rod sleeve, etc. The third drive member 18 includes, but is not limited to, a linear motor, a pneumatic cylinder, and a hydraulic cylinder.

[0049] The density measuring mechanism 1 further includes a third driving member 18 installed on the second carrier plate 153 and connected to the third carrier plate 154; the direction in which the third driving member 18 drives the third carrier plate 154 to move is perpendicular to the direction in which the second carrier plate 153 drives the first carrier plate 152 to move.

[0050] In this embodiment, the second driving member 13 can drive the hook 14 to move via the third carrier plate 154, the second driving member 13, the first carrier plate 152, and the first guide rod 151. After the hook 14 hooks the valve stem 31 of the switching valve 3, the second driving member 13 then drives the valve stem 31 to move via the hook 14, so that the valve stem 31 can control the first valve hole 321 or the second valve hole 322 to connect to the internal space 43 of the battery fixture 4. In this embodiment, the design of the third driving member 18 ensures the stability of the hook 14 hooking the valve stem 31 of the switching valve 3; in addition, during the process of the second driving member 13 driving the hook 14 to move in the vertical direction, the first guide rod 151 slides in the first guide hole, thereby ensuring the stability of the hook 14 moving in the vertical direction.

[0051] In one embodiment, such as Figure 1 and Figure 2 As shown, the sliding assembly 155 includes a first guide rail mounted on the second carrier plate 153 and a first slider mounted on the third carrier plate 154, with the first slider slidably connected to the first guide rail. Specifically, during the movement of the third carrier plate 154 driven by the third driving member 18, the third carrier plate 154 moves on the first guide rail via the first slider, thereby ensuring the stability and load capacity of the movement of the third carrier plate 154.

[0052] In one embodiment, such as Figure 1 As shown, the support frame 11 is provided with a second guide hole, and the measuring mechanism 1 further includes a second guide rod 19 connected to the first support member 15. The second guide rod 19 is slidably inserted into the second guide hole. It can be understood that both the first driving member 12 and the second guide rod 19 are mounted on the external component. Specifically, during the process of the first driving member 12 driving the support member to move vertically, the second guide rod 19 slides along the second guide rail, thereby ensuring the stability of the first support member 15 moving vertically.

[0053] In one embodiment, such as Figure 1As shown in Figure 2, the density testing mechanism 1 further includes a second support member 101, with the first drive member 12 connected to the second support member 101. The second support member 101 is equipped with a plurality of hooks 14 spaced apart. The density testing mechanism 1 includes a plurality of connector assemblies spaced apart on the first support member 15, each connector assembly including a first connector 16 and a second connector 17. The hooks 14 are correspondingly arranged with the connector assemblies. Understandably, the number of hooks 14 and connector assemblies can be set according to actual needs, for example, 6, 8, 10, etc.; one connector assembly and one hook 14 correspond to one battery fixture 4. In this embodiment, the density testing mechanism 1 can perform density testing on multiple battery fixtures 4 at once, improving the efficiency of the density testing mechanism 1.

[0054] In one embodiment, such as Figure 1 As shown, the sealing mechanism 1 also includes a first sealing element 102 and a second sealing element 103, both mounted on the support frame 11. The first sealing element 102 is connected to the first connector 16, and the second sealing element 103 is connected to the second connector 17. It is understood that the first sealing element 102 and the second sealing element 103 include, but are not limited to, sealing sensors. The first sealing element 102 can measure the sealing performance of the battery body 2 through the first connector 16, and the second sealing element 103 can measure the sealing performance of the battery fixture 4 through the second connector 17. In this embodiment, the design of the first sealing element 102 and the second sealing element 103 improves the automation level of the sealing mechanism 1.

[0055] like Figures 1 to 4 As shown, another embodiment of the present invention also provides a battery testing device, including a switching valve 3, a battery fixture 4, and the aforementioned density measuring mechanism 1;

[0056] like Figure 4As shown, the switching valve 3 includes a valve stem 31 and a valve seat 32 installed in the battery fixture 4. The valve seat 32 is provided with a first valve hole 321, a second valve hole 322, a first channel 323, and a control hole 324. The valve stem 31 is slidably installed in the control hole 324. The first valve hole 321 and the second valve hole 322 are both connected to the first channel 323 through the control hole 324. The valve stem 31 is used to control the connection between the first valve hole 321 or the second valve hole 322 and the first channel 323. It can be understood that the top of the valve stem 31 extends out of the control hole 324. When the first connector 16 is not connected to the first valve hole 321, the first valve hole 321 is in a blocked state. When the second connector 17 is not connected to the second valve hole 322, the second valve hole 322 is in a blocked state. The first valve hole 321 and the second channel 41 are always in a connected state. The valve stem 31 is used to switch the connection between the first valve hole 321 or the second valve hole 322 and the first channel 323.

[0057] The battery fixture 4 is provided with a second channel 41, a third channel 42, and an internal space 43 for mounting the battery body 2. The first valve hole 321 is connected to the inner cavity 21 of the battery body 2 through the second channel 41, and the first channel 323 is connected to the internal space 43 through the third channel 42. It can be understood that the first valve hole 321 is connected to the inner cavity 21 of the battery body 2 through the third channel 42; the first valve hole 321 can also be connected to the internal space 43 sequentially through the control hole 324, the first channel 323, and the third channel 42; the second valve hole 322 can be connected to the internal space 43 sequentially through the control hole 324, the first channel 323, and the third channel 42.

[0058] In this invention, the battery testing device can test the sealing performance of the battery body 2 and the battery fixture 4, and the sealing accuracy is high. Furthermore, the battery testing device has a compact structure, occupies little space, has a simple structure, and low manufacturing cost.

[0059] In one embodiment, such as Figure 1 As shown, the first valve hole 321, the first channel 323, and the second valve hole 322 are connected to the control hole 324 through the first opening 325, the second opening 326, and the third opening 327, respectively. The first opening 325, the second opening 326, and the third opening 327 are distributed sequentially at intervals along the axial direction of the control hole 324. It can be understood that the second opening 326 is located between the first opening 325 and the third opening 327.

[0060] The valve stem 31 is provided with a sealing part 311; it can be understood that the sealing part 311 may be a sealing ring fitted on the valve stem 31.

[0061] When the sealing part 311 slides between the first opening 325 and the second opening 326, the second valve hole 322 sequentially connects to the internal space 43 through the control hole 324, the first channel 323, and the third channel 42; simultaneously, the first valve hole 321 connects to the inner cavity 21 of the battery body 2 through the second channel 41. At this time, the battery body 2 can be evacuated independently through the first connector 16; the battery fixture 4 can be evacuated independently through the second connector 17.

[0062] When the sealing part 311 slides between the second opening 326 and the third opening 327, the first valve hole 321 sequentially connects to the internal space 43 through the control hole 324, the first channel 323, and the third channel 42; simultaneously, the first valve hole 321 also connects to the inner cavity 21 of the battery body 2 through the first channel 323 and the second channel 41; at this time, the internal space 43 and the inner cavity 21 can be evacuated simultaneously through the first connector 16. In this embodiment, the switching valve 3 has a simple structure and low manufacturing cost.

[0063] In one embodiment, such as Figure 2 and Figure 4 As shown, the valve stem 31 is provided with a hook groove 312 located outside the control hole 324. The hook 14 drives the valve stem 31 to move within the control hole 324 through the hook groove 312. It can be understood that the hook groove 312 is located at the top of the valve stem 31. After the hook 14 hooks the valve stem 31 through the hook groove 312, the second driving member 13 drives the hook 14 to move upward, thereby allowing the valve stem 31 to control the first valve hole 321 or the second valve hole 322 to connect to the first channel 323.

[0064] In one embodiment, such as Figure 4 As shown, the valve stem 31 has a first magnetic attraction part at the end away from the hook groove 312, and the valve seat 32 also has a second magnetic attraction part disposed opposite to the first magnetic attraction part. It can be understood that the first magnetic attraction part is disposed at the bottom of the valve stem 31; the first magnetic attraction part and the second magnetic attraction part can be either a magnet or an iron piece, or both can be magnets.

[0065] In this embodiment, the second magnetic attraction part can drive the valve rod 31 to move down in the control hole 324 through the first magnetic attraction part, so that the sealing part 311 is located between the second opening 326 and the third opening 327; when the switching valve 3 is in the free state, the first valve hole 321 connects the inner cavity 21 of the battery body 2 and the internal space 43 of the battery fixture 4, and the second valve hole 322 does not connect the internal space 43 of the battery fixture 4.

[0066] The above are merely embodiments of the detection mechanism and battery testing equipment of this utility model, and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing mechanism for measuring the sealing performance of a battery fixture on which a battery body is mounted, wherein the battery fixture is equipped with a switching valve, characterized in that, It includes a support frame, a first driving component, a second driving component, a hook, a first support member, and a first connector and a second connector, both mounted on the first support member; the first driving component is mounted on the support frame and connected to the first support member; the second driving component is mounted on the first support member and connected to the hook; The first driving member is used to drive the first connector and the second connector to dock with the first valve hole and the second valve hole of the switching valve respectively through the first support member. The first valve hole communicates with the inner cavity of the battery body. The second driving member is used to move the valve stem of the switching valve through the hook, so that the second valve hole or the first valve hole connects to the internal space for mounting the battery fixture.

2. The secret detection mechanism according to claim 1, characterized in that, The first support member includes a first guide rod, a first carrier plate, and a second carrier plate with a through hole. The second drive member is mounted on the second carrier plate and connected to the first carrier plate. One end of the first guide rod is mounted on the first carrier plate, and the other end of the first guide rod passes through the through hole and is connected to the hook. The first connector and the second connector are both mounted on the second carrier plate, and the output end of the first drive member is connected to the second carrier plate.

3. The detection mechanism according to claim 2, characterized in that, The first support also includes a third carrier plate with a first guide hole and a sliding assembly. The third carrier plate is mounted on the second carrier plate via the sliding assembly. The second drive member is mounted on the end of the third carrier plate away from the sliding assembly. The end of the first guide rod away from the first carrier plate passes through the first guide hole and the through hole in sequence and is then connected to the hook. The density measuring mechanism further includes a third driving member mounted on the second carrier plate and connected to the third carrier plate; the direction in which the third driving member drives the third carrier plate to move is perpendicular to the direction in which the second carrier plate drives the first carrier plate to move.

4. The secret detection mechanism according to claim 3, characterized in that, The sliding assembly includes a first guide rail mounted on the second carrier plate and a first slider mounted on the third carrier plate, wherein the first slider is slidably connected to the first guide rail.

5. The secret detection mechanism according to claim 1, characterized in that, The support frame is provided with a second guide hole, and the density measuring mechanism further includes a second guide rod connected to the first support member, the second guide rod being slidably inserted into the second guide hole.

6. The secret detection mechanism according to claim 1, characterized in that, The density measuring mechanism further includes a second support member, the first driving member is connected to the second support member, and the second support member is equipped with a plurality of hooks spaced apart; The density measuring mechanism includes a plurality of connector assemblies spaced apart on the first support member, each connector assembly including a first connector and a second connector; the hooks are configured in a one-to-one correspondence with the connector assemblies.

7. The secret detection mechanism according to claim 1, characterized in that, The density measuring mechanism also includes a first density measuring component and a second density measuring component, both of which are installed on the support frame. The first density measuring component is connected to the first connector, and the second density measuring component is connected to the second connector.

8. A battery testing device, characterized in that, Includes a switching valve, a battery fixture, and a density measuring mechanism as described in any one of claims 1 to 7; The switching valve includes a valve stem and a valve seat installed in the battery fixture. The valve seat is provided with a first valve hole, a second valve hole, a first channel, and a control hole. The valve stem is slidably installed in the control hole. The first valve hole and the second valve hole are both connected to the first channel through the control hole. The valve stem is used to control the first valve hole or the second valve hole to connect to the first channel. The battery fixture is provided with a second channel, a third channel, and an internal space for mounting the battery body; the first valve hole is connected to the inner cavity of the battery body through the second channel, and the first channel is connected to the internal space through the third channel.

9. The battery testing equipment according to claim 8, characterized in that, The first valve hole, the first channel, and the second valve hole are connected to the control hole through the first opening, the second opening, and the third opening, respectively. The first opening, the second opening, and the third opening are distributed sequentially at intervals along the axial direction of the control hole. The valve stem is provided with a sealing part; When the sealing part slides between the first opening and the second opening, the second valve hole sequentially connects to the internal space through the control hole, the first channel and the third channel; When the sealing part slides between the second opening and the third opening, the first valve hole sequentially connects to the internal space through the control hole, the first channel and the third channel.

10. The battery testing equipment according to claim 8, characterized in that, The valve stem is provided with a hook groove located outside the control hole, and the hook drives the valve stem to move in the control hole through the hook groove.

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