Liquid injection detection device and automatic liquid injection machine

Abstract

The invention relates to a liquid injection detection device and an automatic liquid injection machine, and relates to the technical field of detection, the liquid injection detection device comprises a limiting structure, a pressure detector and a liquid supplementing structure, and the limiting structure is provided with a limiting groove; the pressure detector is arranged in the limiting groove, and a calibrated pressure value is preset; the liquid supplementing structure is arranged on the limiting structure and comprises a liquid supplementing box and a liquid supplementing gun, and the liquid supplementing gun is communicated with the liquid supplementing box through a pipeline and connected with the pressure detector; when the detected pressure value detected by the pressure detector is smaller than a calibrated pressure value, the electrolyte supplementing gun supplements electrolyte to the initial aluminum battery product, and when the detected pressure value reaches the calibrated pressure value, the electrolyte supplementing gun stops running. The injection amount of the electrolyte actually injected into the initial product of the aluminum battery can be detected, when the injection amount does not meet the requirement, the electrolyte can be supplemented into the initial product of the aluminum battery in time, and the yield of the machined aluminum battery is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a liquid injection detection device and an automatic liquid injection machine. Background Art

[0002] The automatic liquid injection machine is a key equipment in the lithium battery manufacturing process, which is used to accurately inject electrolyte into the aluminum battery primary product. The automatic liquid injection machine mainly includes a liquid injection structure, a vacuum pumping structure and a sealing structure, which perform liquid injection, vacuum pumping and sealing on the aluminum battery primary product in turn.

[0003] The primary product of aluminum battery mainly includes battery cells and aluminum-plastic film covering the battery cells. The aluminum-plastic film is folded in half to form two parts, and the battery cell is placed between the two parts. The bottom and side edges of the aluminum-plastic film are then sealed, so that the primary product of aluminum battery has a bag-like structure with an opening as a whole, and the liquid injection structure injects liquid into the primary product of aluminum battery from the opening.

[0004] During the injection process, the injection structure moves downward and injects liquid into the aluminum battery primary product from the opening. After the injection is completed, the injection structure is reset. During the reset process, as the injection structure moves upward, all electrolytes will be carried out of the aluminum battery primary product by the injection structure. At the same time, part of the electrolyte will be splashed outside the aluminum battery during the injection. In this way, the amount of electrolyte actually injected into the aluminum battery primary product does not meet the requirements, resulting in a low yield rate of the aluminum battery finally produced. Summary of the invention

[0005] The purpose of the present application is to provide a liquid injection detection device and an automatic liquid injection machine, which can detect the actual injection amount of electrolyte injected into the primary product of aluminum battery. When the injection amount does not reach the requirement, the electrolyte can be replenished into the primary product of aluminum battery in time to ensure the yield rate of the processed aluminum battery.

[0006] In the first aspect, the present application provides a liquid injection detection device adopting the following technical solution:

[0007] A liquid injection detection device, comprising:

[0008] The limiting structure has a limiting slot;

[0009] A pressure detector is arranged in the limit groove and is preset with a calibrated pressure value;

[0010] A fluid replenishment structure, arranged on the limiting structure, comprising a fluid replenishment box and a fluid replenishment gun, wherein the fluid replenishment gun is connected to the fluid replenishment box through a pipeline and is connected to the pressure detector;

[0011] When the detected pressure value detected by the pressure detector is less than the calibrated pressure value, the liquid replenishing gun replenishes electrolyte to the aluminum battery primary product, and when the detected pressure value reaches the calibrated pressure value, the liquid replenishing gun stops running.

[0012] Furthermore, the limiting structure includes:

[0013] A first limiting plate, wherein the limiting groove is provided on the first limiting plate;

[0014] The second limiting plate is arranged opposite to and spaced from the first limiting plate, and is provided with a limiting hole, wherein the limiting hole is arranged opposite to the limiting groove, so that when one end of the aluminum battery primary product is placed in the limiting groove, the other end of the aluminum battery primary product passes through the limiting hole.

[0015] Furthermore, it also includes a support plate, which is covered on the pressure detector and is sealed and connected to the first limit plate to form a space for accommodating the pressure detector;

[0016] The support plate has a movable spacing relative to the pressure detector in the direction of gravity.

[0017] Furthermore, an annular groove is formed on the bottom wall of the limiting groove, the bottom of the supporting plate is movable and sealed with a sealing ring, and the sealing ring at least partially extends into the annular groove to seal the peripheral area of ​​the pressure detector.

[0018] Furthermore, a liquid collecting groove is provided on the first limiting plate and the second limiting plate, and a recovery structure is provided at the bottom wall of the liquid collecting groove for recovering the sputtered electrolyte.

[0019] Furthermore, a blocking structure is provided above the recovery structure, and the blocking structure comprises:

[0020] Blocking block;

[0021] A blocking driving member connected to the blocking block;

[0022] The blocking driving member is connected to the pressure detector, and is used to open the liquid collecting groove when the primary lithium battery product enters the limiting groove, and to close the liquid collecting groove when the primary lithium battery product is pushed out of the limiting groove.

[0023] Furthermore, a clamping structure is provided on the limiting structure, and the clamping structure includes a pair of clamping units arranged opposite to each other on both sides of the pressure detector; each of the clamping units includes:

[0024] A clamping plate extending along the force direction of the pressure detector, the clamping plate passes through the limiting hole, and both ends of the clamping plate protrude from the limiting hole;

[0025] A clamping driving member, which is supported on the limiting structure and connected to the clamping plate to drive the corresponding clamping plate to move toward the other clamping plate;

[0026] The clamping drive is connected to the pressure detector and is used to limit the side of the primary lithium battery product when the primary lithium battery product enters the limiting groove.

[0027] Furthermore, the end of the clamping plate away from the pressure detector is fixed to a mounting frame, and a mounting groove is provided on the mounting frame. A pair of the mounting grooves are arranged opposite to each other, and a support structure is provided in the mounting groove, and the support structure includes:

[0028] A connecting rod, rotatably connected to the mounting frame;

[0029] An expansion drive member, the output end of which is retractable and connected to one end of the connecting rod, and is used to drive the connecting rod to move laterally and rotate;

[0030] A connecting plate is connected to the other end of the connecting rod.

[0031] Furthermore, the fluid infusion gun is arranged on any one of the connecting plates, the connecting rod is arranged hollow, and the fluid infusion box is connected to the fluid infusion gun through the connecting rod.

[0032] In the second aspect, the present application provides a liquid injection detection device adopting the following technical solution:

[0033] A lithium battery automatic liquid filling machine comprises a liquid filling structure, a vacuum pumping structure, a sealing structure and the above-mentioned liquid filling detection device.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The present application is provided with a pressure detector and a liquid replenishing structure, which can timely replenish the electrolyte sputtered outside the primary aluminum battery product, so that the amount of electrolyte injected into the primary aluminum battery product meets the requirements, thereby improving the yield rate of the processed aluminum battery.

[0036] 2. The present application is provided with a clamping structure. When the lithium battery primary product is limited by the limiting structure, the two clamps approach each other to clamp the side of the aluminum battery primary product, thereby reducing the possibility of leakage caused by the liquid injection structure destroying the sealing of the side of the aluminum battery primary product when the opening is stretched.

[0037] 3. The present application is provided with a support structure. After the aluminum battery primary product is clamped by the clamping assembly, the support structure extends from the installation groove on the clamping plate to expand the opening on the aluminum battery primary product, thereby facilitating the injection structure to inject electrolyte into the aluminum battery primary product, thereby reducing the possibility of position deviation and leakage during the process of the injection structure extending into the aluminum battery primary product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the liquid injection detection device in this application;

[0039] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A;

[0040] Figure 3 yes Figure 1 A partial enlarged schematic diagram of part B;

[0041] Figure 4 It is a schematic diagram of the cross-sectional structure of the liquid injection detection device in this application.

[0042] In the figure, 1. limiting structure; 11. limiting groove; 111. annular groove; 112. inclined surface; 12. first limiting plate; 121. liquid collecting groove; 13. second limiting plate; 131. limiting hole; 14. supporting plate; 2. pressure detector; 3. rehydration structure; 31. rehydration box; 32. rehydration gun; 4. sealing ring; 5. recovery structure; 6. blocking structure; 61. blocking block; 62. blocking drive member; 7. clamping structure; 71. splint; 711. mounting groove; 72. clamping drive member; 8. expansion structure; 81. connecting rod; 82. expansion drive member; 83. connecting plate. DETAILED DESCRIPTION

[0043] The following will be combined with the attached Figure 1-4 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0044] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0047] A liquid injection detection device, referring to Figure 1 and Figure 2 , including a limiting structure 1, the limiting structure 1 is provided with a limiting groove 11, when the aluminum battery primary product is loaded onto the limiting structure 1, the limiting groove 11 will limit the aluminum battery primary product, so that the aluminum battery primary product remains in a vertical state, so that the liquid injection structure can inject liquid into the aluminum battery primary product.

[0048] The primary product of aluminum battery mainly includes battery cells and aluminum-plastic film covering the battery cells. The aluminum-plastic film is folded in half to form two parts, and the battery cell is placed between the two parts. The bottom and side edges of the aluminum-plastic film are then sealed, so that the primary product of aluminum battery has a bag-like structure with an opening as a whole, and the liquid injection structure injects liquid into the primary product of aluminum battery from the opening.

[0049] However, during the actual process of injecting the electrolyte, the injection structure moves downward to extend into the aluminum battery primary product. When the electrolyte is injected, part of the electrolyte will be splashed outside the aluminum battery primary product, resulting in the actual amount of electrolyte injected into the aluminum battery primary product failing to meet the requirements.

[0050] Therefore, refer to Figure 3 and Figure 4 A liquid filling detection device also includes a pressure detector 2 and a liquid replenishing structure 3. The pressure detection is set in the limit groove 11, and a calibration pressure value is set. The liquid replenishing structure 3 is set on the limit structure 1, and is used to replenish the aluminum battery primary product. The liquid replenishing structure 3 includes a liquid replenishing box 31 and a liquid replenishing gun 32. The liquid replenishing box 31 stores electrolyte. The liquid replenishing gun 32 is connected to the liquid replenishing box 31 through a pipeline and is connected to the pressure detector 2.

[0051] When the aluminum battery primary product is limited to the limit groove 11, the pressure detector 2 first detects the weight of the aluminum battery primary product and the injected electrolyte. When the detection pressure value detected by the pressure detector 2 is less than the calibrated pressure value, the liquid replenishing gun 32 replenishes the electrolyte to the aluminum battery primary product until the detection pressure value reaches the calibrated pressure value. When the detection pressure value reaches the calibrated pressure value, the liquid replenishing gun 32 stops running.

[0052] By setting up the pressure detector 2 and the liquid replenishing structure 3, the electrolyte sputtered outside the primary aluminum battery product can be replenished in time, so that the amount of electrolyte injected into the primary aluminum battery product meets the requirements, thereby improving the yield rate of the processed aluminum battery.

[0053] It should be noted that, in another specific embodiment, the pressure detector 2 may also be preset with a tare weight, that is, when the pressure detector 2 performs detection work, only the weight of the electrolyte is detected.

[0054] Furthermore, considering that the weight of the primary aluminum battery product in actual production has deviations, in other specific embodiments, a deviation value may be further preset, and the detected pressure value may be within the calibrated pressure range. Alternatively, the pressure detector 2 performs two tests. Specifically, the primary aluminum battery product is first tested, and then the primary aluminum battery product and the electrolyte are tested to improve the detection accuracy.

[0055] In addition, since the sides of the aluminum battery are closed by sealing, when the liquid injection structure extends into the primary product of the aluminum battery, it will stretch the opening, causing the upper part of the side of the aluminum battery to collapse, and the electrolyte injected into the primary product of the aluminum battery will leak from the side.

[0056] In this regard, refer to Figure 1 A clamping structure 7 is arranged on the limiting structure 1 , and the clamping structure 7 includes a pair of clamping units arranged opposite to each other on both sides of the pressure detector 2 , and each clamping unit includes a clamping plate 71 and a clamping driving member 72 .

[0057] The clamping member 72 is extended along the force direction of the pressure detector 2, and the clamping plate passes through the limiting hole 131, and the two ends protrude from the limiting hole 131; the clamping driving member 72 is supported on the limiting structure 1 and connected to the clamping plate 71 to drive the corresponding clamping plate 71 to move toward the other clamping plate;

[0058] When the lithium battery primary product is limited by the limiting structure 1, the two clamps 71 approach each other to clamp the side of the aluminum battery primary product, thereby reducing the possibility of the injection structure damaging the sealing of the side of the aluminum battery primary product when opening the mouth.

[0059] Furthermore, the clamping drive 72 is connected to the pressure detector 2. When the aluminum battery primary product is limited by the limiting structure 1, the support plate 14 is pressurized, and the pressure detector 2 detects the pressure value. At this time, the pressure detector 2 controls the clamping drive 72, so that the clamping drive 72 drives the clamping plate 71 to move. The two clamping plates 71 approach each other and finally clamp the sides of the lithium battery primary product.

[0060] In addition, the end of the clamp 71 away from the pressure detector is fixed to the mounting frame, and a mounting groove 711 is opened on the mounting frame. A pair of mounting grooves 711 are arranged opposite to each other, and a support structure 8 is arranged in the mounting groove 711, which can support the opening before the injection structure is extended into the aluminum battery primary product.

[0061] Specifically, combined Figure 2 The expansion structure 8 includes a connecting rod 81, an expansion driving member 82 and a connecting plate 83. The connecting rod 81 is rotatably connected to the clamping plate 71. The output end of the expansion driving member 82 is retractable and connected to one end of the connecting rod 81. The connecting plate 83 is connected to the other end of the connecting rod 81.

[0062] When the side of the aluminum battery primary product is clamped by the clamping plate 71, the expansion drive member 82 drives the connecting rod 81 to rotate, so that the connecting rod 81 and the connecting plate 83 on the connecting rod 81 withdraw from the installation groove 711, and the connecting rod 81 is finally in a horizontal state, and the connecting plate 83 extends to the opening; then the output shaft of the expansion drive member 82 is shortened, so that the two connecting plates 83 are separated from each other, and the two connecting plates 83 expand the opening.

[0063] By providing the support structure 8, the opening of the aluminum battery primary product is expanded before the liquid injection structure extends into the aluminum battery primary product, thereby ensuring that the liquid injection structure can smoothly inject liquid into the aluminum battery primary product.

[0064] Furthermore, in this embodiment, the liquid replenishing gun 32 is arranged on any one of the connecting plates 83, the connecting rod 81 is hollow, and the liquid replenishing box 31 is connected to the liquid replenishing gun 32 through the connecting rod 81 (the pipeline passes through the connecting rod 81). In this way, the overall layout of the liquid filling detection device is made more compact, and the liquid filling gun has been extended into the aluminum battery primary product when the connecting plate 83 expands the aluminum battery primary product, so as to facilitate subsequent liquid replenishing actions.

[0065] In a specific embodiment, the liquid replenishing gun 32 is located on the side of the two connecting plates 83 that are opposite to each other. When injecting liquid, the connecting plate 83 will act as a baffle to block the sputtered electrolyte, and finally flow into the aluminum battery primary product along the plate surface of the connecting plate 83.

[0066] Further, refer to Figure 1 The limiting structure 1 includes a first limiting plate 12, a second limiting plate 13 and a supporting plate 14. The limiting groove 11 is provided on the first limiting plate 12, the second limiting plate 13 is arranged opposite to the first limiting plate 12 and spaced apart, and a limiting hole 131 is provided, so that when one end of the aluminum battery primary product is placed in the limiting groove 11, the other end of the aluminum battery primary product passes through the limiting hole 131.

[0067] Furthermore, the support plate 14 is covered on the pressure detector 2 and is sealed with the first limit plate 12 to form a space for accommodating the pressure detector 2, wherein the support plate 14 has a certain movable spacing relative to the pressure detector 2 in the gravity direction thereof.

[0068] The initial aluminum battery product is in the shape of a long strip. When the limiting structure 1 limits the aluminum battery, the limiting groove 11 on the first limiting plate 12 limits the bottom of the aluminum battery, and the limiting hole 131 on the second limiting plate 13 limits the waist of the aluminum battery, so that the initial aluminum battery product can better maintain a vertical posture when being injected with liquid.

[0069] At the same time, during the process of injecting and resetting the injection structure, the sputtered electrolyte mainly falls on the second limiting plate 13, and the second limiting plate 13 can better intercept the sputtered electrolyte, and a small amount of electrolyte will fall into the limiting groove 11 along the limiting hole 131 on the second limiting plate 13, and the support plate 14 can reduce the possibility of electrolyte corrosion to the pressure sensor, and better protect the pressure sensor, and at the same time can also increase the pressure conduction area to ensure detection accuracy.

[0070] In addition, refer to Figure 4 The bottom wall of the limiting groove 11 is provided with an annular groove 111, the bottom of the support plate 14 is movable and sealed with a sealing ring 4, and the sealing ring 4 at least partially extends into the annular groove 111, and the sealing ring 4 can better seal the peripheral area of ​​the pressure detector 2. When the electrolyte falls into the limiting groove 11, the sealing ring 4 can limit the flow direction of the electrolyte, reducing the possibility of the electrolyte penetrating into the pressure detector 2 from the gap formed between the support plate and the bottom wall of the limiting groove 11.

[0071] At the same time, a slope 112 may be provided at the edge of the top surface of the support plate 14 . The electrolyte falling into the limiting groove 11 can be better guided by the guidance of the slope 112 , thereby reducing the possibility of the electrolyte falling onto the support plate 14 .

[0072] Furthermore, combined with Figure 1 and Figure 3 A liquid collecting tank 121 is provided on the first limiting plate 12 and the second limiting plate 13, and a recovery structure 5 is provided at the bottom wall of the liquid collecting tank 121. By providing the recovery structure 5 and the liquid collecting tank 121, the sputtered electrolyte can be collected and recovered in time to ensure the cleanliness and safety of the working environment.

[0073] Correspondingly, a slope 112 is provided on the groove wall of the limiting groove 11 and the top surface of the second limiting plate 13. The sputtered electrolyte falls on the slope 112 and is guided by the slope 112 to flow toward the liquid collecting groove 121 and finally enter the recovery structure 5.

[0074] In a specific embodiment, the recovery structure 5 is configured as a liquid collecting box, which is installed in the liquid collecting tank 121. When a large amount of electrolyte is collected in the liquid collecting box, the liquid collecting box can be replaced in time to ensure the smooth progress of the recovery work.

[0075] Furthermore, in another specific embodiment, another pressure detector 2 can be arranged on the bottom side of the liquid collecting tank, and a pump group can be arranged in the liquid collecting tank. The pressure detector 2 is connected to the pump group. After the electrolyte in the liquid collecting tank is filled up and reaches the set pressure value, the pressure detector 2 sends a control signal to the pump group, so that the pump group transfers the electrolyte in the liquid collecting tank to other locations.

[0076] Furthermore, a sealing structure 6 is provided above the recovery structure 5, and the sealing structure 6 can seal the liquid collecting tank 121. Specifically, the sealing structure 6 includes a sealing block 61 and a sealing driving member 62, and the sealing driving member 62 is connected to the sealing block 61; the sealing driving member 62 is connected to the pressure detector 2, and is used to open the liquid collecting tank 121 when the lithium battery primary product enters the limiting groove 11, and close the liquid collecting tank 121 when the lithium battery primary product is pushed out of the limiting groove 11.

[0077] By setting the blocking structure 6, when the initial lithium battery product is limited by the limiting structure 1, the support plate 14 is pressurized, and the pressure detector 2 detects the pressure value. At this time, the pressure detector 2 will control the blocking drive 62 to pull the blocking block 61, so that the blocking block 61 retreats, and the liquid collecting tank 121 is opened to collect the splashed electrolyte during the injection process, reduce the time the electrolyte is exposed to the air, and reduce the possibility of volatilization or hydrolysis of the lithium battery to produce toxic substances (lithium batteries mainly include organic solvents and lithium salts).

[0078] In addition, the present application also discloses an automatic liquid filling machine for lithium batteries, including a liquid filling structure, a vacuum pumping structure, a sealing structure and the above-mentioned liquid filling detection device. The liquid filling structure, the vacuum pumping structure and the sealing structure sequentially perform liquid filling, vacuum pumping and sealing processes on the primary product of the aluminum battery.

[0079] The implementation principle of the embodiment of the present application is:

[0080] The aluminum battery primary product is placed on the limiting structure 1, the pressure detector 2 detects the pressure and sends a control signal to the clamping assembly, the aluminum battery primary product will be clamped by the clamping plate 71 on the side after edge sealing, and then the expansion structure 8 extends from the mounting groove 711 on the clamping plate 71 to expand the opening on the aluminum battery primary product, thereby facilitating the injection structure to inject electrolyte into the aluminum battery primary product, reducing the possibility of position deviation or breaking the side after edge sealing and causing leakage during the process of the injection structure extending into the aluminum battery primary product.

[0081] Synchronously, during the process of the aluminum battery primary product being injected with electrolyte, the sealing structure 6 moves to open the liquid collecting tank 121, and the electrolyte sputtered by the injection structure enters the recovery structure 5 under the guidance of the inclined surface 112. When the injection is completed, the pressure detector 2 will measure the weight of the aluminum battery primary product after the injection. When the measured value does not reach the calibrated pressure value, the replenishing structure 3 can replenish the electrolyte sputtered outside the aluminum battery primary product in time, so that the amount of electrolyte injected into the aluminum battery primary product meets the requirements, thereby improving the yield rate of the processed aluminum battery.

[0082] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A liquid injection detection device, characterized in that: include: The limiting structure (1) is provided with a limiting groove (11); A pressure detector (2) is arranged in the limiting groove (11) and is preset with a calibrated pressure value; A fluid replenishment structure (3) is arranged on the limiting structure (1), comprising a fluid replenishment box (31) and a fluid replenishment gun (32), wherein the fluid replenishment gun (32) is connected to the fluid replenishment box (31) through a pipeline and is connected to the pressure detector (2); When the detected pressure value detected by the pressure detector (2) is less than the calibrated pressure value, the liquid replenishing gun (32) replenishes electrolyte to the aluminum battery primary product, and when the detected pressure value reaches the calibrated pressure value, the liquid replenishing gun (32) stops running.

2. A liquid injection detection device according to claim 1, characterized in that: The limiting structure (1) comprises: A first limiting plate (12), wherein the limiting groove (11) is provided on the first limiting plate (12); The second limiting plate (13) is arranged opposite to and spaced from the first limiting plate (12), and is provided with a limiting hole (131). The limiting hole (131) is arranged opposite to the limiting groove (11), so that when one end of the aluminum battery primary product is placed in the limiting groove (11), the other end of the aluminum battery primary product passes through the limiting hole (131).

3. A liquid injection detection device according to claim 2, characterized in that: It also includes a support plate (14), which is covered on the pressure detector (2) and is sealed with the first limit plate (12) to form a space for accommodating the pressure detector (2); The support plate (14) has a movable spacing relative to the pressure detector (2) in the direction of its gravity.

4. A liquid injection detection device according to claim 3, characterized in that: The bottom wall of the limiting groove (11) is provided with an annular groove (111), the bottom of the supporting plate (14) is movable and sealed with a sealing ring (4), and the sealing ring (4) at least partially extends into the annular groove (111) to seal the peripheral area of ​​the pressure detector (2).

5. A liquid injection detection device according to claim 2, characterized in that: The first limiting plate (12) and the second limiting plate (13) are both provided with a liquid collecting groove (121), and a recovery structure (5) is provided at the bottom wall of the liquid collecting groove (121) for recovering the sputtered electrolyte.

6. A liquid injection detection device according to claim 5, characterized in that: A blocking structure (6) is provided above the recovery structure (5), and the blocking structure (6) comprises: Blocking block (61); A blocking driving member (62) connected to the blocking block (61); The blocking drive member (62) is connected to the pressure detector (2) and is used to open the liquid collecting groove (121) when the lithium battery primary product enters the limiting groove (11), and to close the liquid collecting groove (121) when the lithium battery primary product is pushed out of the limiting groove (11).

7. A liquid injection detection device according to claim 2, characterized in that: The limiting structure (1) is provided with a clamping structure (7), and the clamping structure (7) comprises a pair of clamping units arranged opposite to each other on both sides of the pressure detector (2); each of the clamping units comprises: A clamping plate (71) extending along the force direction of the pressure detector (2), the clamping plate passing through the limiting hole (131) and having two ends protruding from the limiting hole (131); A clamping driving member (72), which is supported on the limiting structure (1) and connected to the clamping plate (71) to drive the corresponding clamping plate (71) to move toward another clamping plate; The clamping drive member (72) is connected to the pressure detector (2) and is used to limit the side of the lithium battery primary product when the lithium battery primary product enters the limiting groove (11).

8. A liquid injection detection device according to claim 7, characterized in that: The end of the clamping plate (71) away from the pressure detector (2) is fixed to a mounting frame, and a mounting groove (711) is provided on the mounting frame. A pair of the mounting grooves (711) are arranged opposite to each other, and a support structure (8) is arranged in the mounting groove (711). The support structure (8) includes: A connecting rod (81) rotatably connected to the mounting frame; An expansion drive member (82), the output end of which is retractable and connected to one end of the connecting rod (81) to drive the connecting rod (81) to move laterally and rotate; A connecting plate (83) is connected to the other end of the connecting rod (81).

9. A liquid injection detection device according to claim 8, characterized in that: The fluid replenishing gun (32) is arranged on any one of the connecting plates (83), the connecting rod (81) is arranged hollow, and the fluid replenishing box (31) is connected to the fluid replenishing gun (32) via the connecting rod (81).

10. A lithium battery automatic liquid filling machine, characterized in that: It comprises a liquid injection structure, a vacuum pumping structure, a sealing structure and the liquid injection detection device according to any one of claims 1 to 9.

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