Vacuum liquid injection cup assembly and vacuum liquid injection device

Abstract

The present invention discloses a vacuum liquid injection cup assembly, comprising: a bracket; a liquid injection base, which is fixedly arranged on the bracket, the liquid injection base is a column and is internally provided with at least one group of accommodating cavities penetrating the upper and lower end surfaces; a liquid injection bottom plate, which is fixedly arranged on the bracket, the liquid injection bottom plate is provided with at least one group of liquid injection holes, and each group of the liquid injection holes is arranged corresponding to the accommodating cavity; a liquid injection needle, which is arranged in the accommodating cavity of the liquid injection base and is sealingly and slidably matched with the side wall of the accommodating cavity; wherein, the liquid injection needle is provided with an injection channel for accommodating electrolyte, the outlet of the liquid injection channel is arranged on the side wall of the liquid injection needle, and is located at the accommodating cavity of the liquid injection base, and the two working states of sealing and non-sealing can be realized only by inserting and pulling the liquid injection needle into the liquid injection hole, so that the electrolyte can be conveniently injected into the vacuumized battery shell, the working efficiency is greatly improved, and the operation is simple and quick.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing equipment, and in particular to a vacuum liquid injection cup assembly and a vacuum liquid injection device comprising the vacuum liquid injection cup assembly. Background Art

[0002] The liquid injection machine is a device that injects electrolyte into the battery shell and completely soaks the inside of the battery. When injecting electrolyte into the battery shell, the conventional injection speed is slow and the work efficiency is low. Therefore, most of the existing technologies use vacuum injection to force the electrolyte into the battery shell through pressure difference. However, the existing vacuum injection device usually operates in a semi-vacuum state. The electrolyte is first injected into the liquid holding cup above the battery, and then placed in the pressure chamber. The positive and negative pressure cycles are used to achieve soaking. Multiple vacuum-normal pressure cycles result in low work efficiency, and the electrolyte cannot completely soak the battery. Therefore, it is urgent to find a vacuum injection cup assembly that can achieve vacuum injection and a vacuum injection device containing the vacuum injection cup assembly.

[0003] In view of the above-mentioned defects of the existing liquid injection machine, the inventor, based on many years of rich practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theory, actively conducts research and innovation, in order to create a vacuum liquid injection cup assembly and a vacuum liquid injection device including the vacuum liquid injection cup assembly, so as to make it more practical. After continuous research and design, and repeated trial production and improvement, the present invention with real practical value was finally created. Summary of the invention

[0004] The main purpose of the present invention is to overcome the defects of the existing liquid injection machines and provide a vacuum liquid injection cup assembly that can realize liquid injection in a vacuum environment and a vacuum liquid injection device including the vacuum liquid injection cup assembly, so that it is more suitable for practical use and has industrial utilization value.

[0005] The purpose of the present invention and the solution to the technical problem are achieved by adopting the following technical solutions.

[0006] A vacuum liquid injection cup assembly, comprising:

[0007] Bracket;

[0008] A liquid injection base, fixedly arranged on the bracket, the liquid injection base is a column and has at least one set of accommodating cavities penetrating the upper and lower end surfaces;

[0009] A liquid injection bottom plate, fixedly arranged on the bracket, wherein at least one group of liquid injection holes is arranged on the liquid injection bottom plate, and each group of liquid injection holes is arranged corresponding to the accommodating cavity;

[0010] An injection needle is disposed in the accommodating cavity of the injection base and is in sealing and sliding cooperation with the side wall of the accommodating cavity;

[0011] The injection needle is provided with an injection channel for accommodating electrolyte, and the outlet of the injection channel is arranged on the side wall of the injection needle and is located at the accommodating cavity of the injection base.

[0012] As a preferred technical solution, it also includes a first power component, which is connected to the injection needle and is used to drive the injection needle to move in the injection base, so that the injection needle has a first state of being inserted into and blocking the injection hole and a second state of not blocking the injection hole.

[0013] As a preferred technical solution, the first power assembly includes:

[0014] There are two sets of side plates, which are symmetrically arranged on both sides of the injection base, and the side plates are connected to the injection needle through a slide rail-slider assembly, and the slide rail-slider assembly is inclined;

[0015] A connecting plate, fixedly connected to the two sets of side plates;

[0016] The first driving member is connected to the connecting plate and is used to drive the connecting plate and the two groups of side plates fixedly connected to the connecting plate to move.

[0017] As a preferred technical solution, the first power assembly also includes a guide assembly for guiding the movement of the side panel.

[0018] As a preferred technical solution, the guide assembly includes a slide rail arranged on the liquid injection bottom plate and a slider arranged at the bottom of the side plate.

[0019] As a preferred technical solution, the injection base plate is provided with an injection needle sleeve, and the injection needle sleeve is fixedly arranged on a through hole preset on the injection base plate;

[0020] The injection hole is provided on the injection needle sleeve, and the injection hole includes a first section with a closing shape, a second section with a constant inner diameter, and a third section with a closing shape, and the outer diameter of the lower end of the injection needle is not less than the inner diameter of the second section.

[0021] As a preferred technical solution, the injection needle sleeve includes a first column and a second column, the first section of the injection hole is arranged in the first column, the second section and the third section are arranged in the second column in sequence, and the size of the first column is larger than that of the second column.

[0022] As a preferred technical solution, the outlet of the injection channel of the injection needle is arranged at the bottom of the injection channel and is inclined downward.

[0023] As a preferred technical solution, a groove is provided at the upper end of the injection needle, and a sealing member is sleeved in the groove to enable the injection needle to be sealingly and slidably connected to the inner wall of the injection base.

[0024] Vacuum liquid injection device, comprising:

[0025] A vacuum filling cup assembly as described above;

[0026] The seepage cavity comprises four sets of seepage cavity side panels, and the side panels are provided with an air extraction port for connecting to a vacuum extraction device and an air inlet for connecting to an external environment;

[0027] A vacuum device, connected to the vacuum port, for vacuuming the liquid seepage cavity;

[0028] The cavity bottom plate is used to carry the battery shell to be filled with liquid;

[0029] The second power assembly is connected to the cavity bottom plate and is used to drive the movement of the cavity bottom plate, so that the cavity bottom plate has a sealed state of moving to the bottom of the seepage cavity and a non-sealed state of leaving the seepage cavity.

[0030] As a preferred technical solution, the second power assembly includes:

[0031] A fixing plate, fixedly arranged on the bracket;

[0032] A first guide shaft group, comprising at least two groups of first guide shafts, and one end of each group of the first guide shafts is fixedly disposed on the cavity bottom plate, and the other end is sleeved in a through hole reserved on the fixed plate;

[0033] The second driving member is connected to the cavity bottom plate.

[0034] As a preferred technical solution, it also includes a first movable plate, which is fixedly connected to the movable end of the first guide shaft group, and a buffer is provided on the opposite side of the first movable plate or the fixed plate to limit the movement of the first movable plate.

[0035] As a preferred technical solution, it also includes a positioning component, which is arranged at the bottom of the cavity bottom plate and is used to position the tray of the battery housing to be filled with liquid placed on the cavity bottom plate. The positioning component includes:

[0036] The third moving plate;

[0037] a third driving member, connected to the third movable plate, and used to drive the third movable plate to move toward or away from the seepage chamber;

[0038] The third guide shaft group includes at least two groups of third guide shafts, one end of which is fixedly arranged on the third movable plate, and the other end is sealed and slidably connected with the preset through hole on the cavity bottom plate, and is arranged corresponding to the reserved hole on the tray.

[0039] As a preferred technical solution, it also includes a second guide shaft group, which includes at least two groups of second guide shafts, one end of the second guide shaft is fixedly set at the bottom of the third movable plate, and the other end is sleeved in a preset through hole of the second movable plate.

[0040] As a preferred technical solution, a stop bar for limiting the position of the tray is also provided at the upper end of the cavity bottom plate.

[0041] By adopting the above technical solution, the following technical effects can be achieved:

[0042] The vacuum liquid filling cup assembly includes a liquid filling needle, a liquid filling bottom plate and a liquid filling base. The two working states of sealing and non-sealing can be achieved only by inserting and pulling the liquid filling needle into the liquid filling hole. The electrolyte can be conveniently pre-stored in the sealed accommodating cavity formed by the liquid filling needle, the liquid filling bottom plate and the liquid filling base, and then injected into the vacuumized battery shell when liquid filling is needed, which greatly improves the work efficiency and is simple and quick to operate.

[0043] The vacuum injection device can conveniently introduce the electrolyte into the battery shell in the sealed vacuum cavity enclosed by the seepage cavity, the cavity bottom plate and the injection bottom plate, and since the injection needle and the side wall of the accommodating cavity are sealed and slidably matched, the vacuum environment of the above-mentioned sealed vacuum cavity will not be destroyed. The operation is simple and quick, and since the interior of the battery shell is in a vacuum environment, the electrolyte can quickly penetrate into it, greatly improving the injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is the front view of the vacuum filling cup assembly;

[0045] Figure 2 for Figure 1 Cross-sectional view at AA (the injection needle is in the second state);

[0046] Figure 3 for Figure 1 Cross-sectional view at AA (the injection needle is in the first state);

[0047] Figure 4 It is a partial cross-sectional view of the vacuum liquid injection device;

[0048] Figure 5 is a cross-sectional view of the liquid injection bottom plate;

[0049] Figure 6 It is a top view of the liquid injection bottom plate;

[0050] Figure 7 A front view of another embodiment of a vacuum liquid filling cup assembly;

[0051] Figure 8 This is the front view of the vacuum liquid injection device (unsealed state);

[0052] Fig. 9 This is the front view of the vacuum liquid injection device (sealed state);

[0053] Fig.10 A top view of the tray;

[0054] Wherein: 1- bracket, 2- injection base, 3- injection bottom plate, 4- injection needle, 41- injection channel, 42- outlet of injection channel, 5- injection hole, 6- accommodating chamber, 7- injection needle sleeve, 8- pressure plate, 9- side plate, 10- first driving member, 11- slide rail-slider assembly, 12- seepage chamber side plate, 13- chamber bottom plate, 14- first movable plate, 15- fixed plate, 16- second movable plate, 17- third movable plate, 18- buffer, 19- buffer limit block, 20- second driving member, 21- third driving member, 22- first guide shaft, 23- second guide shaft, 24- third guide shaft. DETAILED DESCRIPTION

[0055] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, characteristics and effects of the vacuum liquid injection cup assembly and the vacuum liquid injection device proposed in the present invention are described in detail as follows.

[0056] like Figure 1-Figure 4As shown, the present invention discloses a vacuum liquid injection cup assembly, comprising: a bracket 1; a liquid injection base 2, which is fixedly arranged on the bracket 1, the liquid injection base 2 is a column and is internally provided with at least one group of accommodating cavities 6 that pass through the upper and lower end surfaces; a liquid injection bottom plate 3, which is fixedly arranged on the bracket 1, and is provided with at least one group of liquid injection holes 5, and each group of liquid injection holes 5 is arranged corresponding to the accommodating cavity 6; a liquid injection needle 4, which is arranged in the accommodating cavity 6 of the liquid injection base 2, and is sealed and slidably matched with the side wall of the accommodating cavity 6; wherein, the liquid injection needle 4 is provided with an injection channel 41 for accommodating electrolyte, and the outlet 42 of the liquid injection channel is arranged on the side wall of the liquid injection needle 4, and is located at the accommodating cavity 6 of the liquid injection base 2. Specifically, the bracket 1 includes four groups of vertical poles and a transversely arranged cross bar for fixing the injection base 2; the injection base 2 is a column, preferably a square column, and the main body of the accommodating cavity 6 arranged inside it is a cylindrical cavity with a constant inner diameter, and its lower end is a closed shape that is wide at the top and narrow at the bottom, so as to facilitate guiding the electrolyte placed in the cavity to the corresponding injection hole 5; the injection bottom plate 3 serves as the upper end plate of the vacuum cavity of the vacuum injection device, and the multiple groups of injection holes 5 opened on the upper part are the inlet of the electrolyte, and the electrolyte enters from the inlet and enters the battery casing located below under its own weight; the upper end of the injection needle 4 is a first section of constant diameter, and the injection needle 4 of this section is provided with an injection channel 41 coaxial with the injection needle 4, the inner diameter of the second section connected to the first section is narrower than that of the first section, and the injection The outlet 42 of the liquid channel is arranged at the connection between the first section and the second section, and the outlet is inclined downward from the injection channel 41 to the accommodating chamber 6, so as to facilitate the introduction of the electrolyte inside the injection channel 41 into the accommodating chamber 6 without accumulating at the bottom of the injection channel 41. The third section of the injection needle 4, that is, the lower end of the injection needle 4, cooperates with the injection hole 5 set on the injection bottom plate 3, and can be inserted into the injection hole 5 and block the injection hole 5 under the action of external force; preferably, a groove is provided on the side wall of the first section of the injection needle 4, and a sealing member, such as a sealing ring, is provided in the groove, and the sealing sliding cooperation between the injection needle 4 and the side wall of the accommodating chamber 6 is realized by the sealing member, that is, the injection needle 4 can move up and down relative to the side wall of the accommodating chamber 6 under the action of external force, but the two always maintain a sealed state.

[0057] As a preferred technical solution, it also includes a first power component, which is connected to the injection needle 4 and is used to drive the injection needle 4 to move in the injection base 2, so that the injection needle 4 has a first state of being inserted into and blocking the injection hole 5 and a second state of not blocking the injection hole 5. The setting of the first power component increases its degree of automation and reduces labor costs.

[0058] As a preferred technical solution, Figure 7As shown, the first power assembly includes: side plates 9, which are provided in two groups and are symmetrically arranged on both sides of the injection base 2, and the side plates 9 are connected to the injection needle 4 through a slide rail-slider assembly 11, and the slide rail-slider assembly 11 is inclined; a connecting plate, which is fixedly connected to the two groups of side plates 9; a first driving member 10, which is connected to the connecting plate and is used to drive the movement of the connecting plate and the two groups of side plates 9 fixedly connected to the connecting plate. Specifically, the two groups of side panels 9 are symmetrically provided with inclined slide rails, and the pressure plate 8 for fixing the upper end of the injection needle 4 is provided with a slider that slides with the slide rail. The horizontal movement of the slide rail on the side panel 9 realizes the vertical movement of the injection needle 4 fixed in the horizontal direction and the pressure plate 8 fixed to the upper end of the injection needle 4. In order to increase the linkage of the side panels 9 on both sides, a connecting plate connecting the two groups of side panels 9 is also provided, and the first driving member 10 is connected to the connecting plate, and the power of the first driving member 10 is transmitted to the two groups of side panels 9 through the connecting plate, wherein the first driving member 10 can be any driving member such as a cylinder, a motor, etc. that can provide the connecting plate with horizontal movement.

[0059] As a preferred technical solution, Figure 7 As shown, the first power assembly also includes a guide assembly for guiding the movement of the side plate 9. Specifically, the guide assembly includes a slide rail arranged on the injection bottom plate 3 and a slider arranged at the bottom of the side plate 9, the extension direction of the slide rail is the length extension direction of the side plate 9, and under the drive of the first driving member 10, the side plate 9 moves along the extension direction of the slide rail, effectively ensuring the consistency of the movement of the two groups of side plates 9, thereby ensuring the accuracy of the vertical movement of the injection needle 4.

[0060] As a preferred technical solution, Figure 5-Figure 6 As shown, a liquid injection needle sleeve 7 is provided on the liquid injection bottom plate 3, and the liquid injection needle sleeve 7 is fixedly arranged on a preset through hole on the liquid injection bottom plate 3; a liquid injection hole 5 is provided on the liquid injection needle sleeve 7, and the liquid injection hole 5 includes a first section in a closed shape, a second section with the same inner diameter, and a third section in a closed shape, and the outer diameter of the lower end of the liquid injection needle 4 is not less than the inner diameter of the second section. Specifically, the shape of the through hole matches the shape of the liquid injection needle sleeve 7, including two sections with different inner diameters; as shown Figure 1-Figure 3As shown, the injection needle sleeve 7 is a cylinder including two sections with different inner diameters, and an injection hole 5 is arranged inside. The injection needle sleeve 7 is arranged in a preset through hole on the injection bottom plate 3, which is convenient for cleaning and replacement after wear, and effectively saves costs; the injection hole 5 of the injection needle sleeve 7 includes a first section with an inner diameter gradually decreasing from top to bottom and in a closed shape, and the inner diameter of its upper end portion is equal to the inner diameter of the connected accommodating cavity 6, that is, the inner diameter of its upper end portion is equal to the inner diameter of the bottom of the accommodating cavity 6, so that it is convenient to place the liquid in the accommodating cavity 6 The electrolyte is introduced into the injection hole 5, and the inner diameter of the second section with the same inner diameter is equal to the outer diameter of the lower end of the injection needle 4. The setting of this section facilitates the sealing when the injection needle 4 is inserted, and increases the sealing performance of the injection needle 4 when it is in a sealed state. Like the first section, the third section with an inner diameter gradually decreasing from top to bottom and closing in shape cooperates with the tapered end of the lower end of the injection needle 4 to achieve complete sealing of the two. In order to further increase the sealing effect, a groove is provided on the side wall of the second section for placing a seal.

[0061] As a preferred technical solution, the injection needle sleeve 7 includes a first column and a second column, the first section of the injection hole 5 is arranged in the first column, the second section and the third section are arranged in the second column in sequence, and the size of the first column is larger than that of the second column. Specifically, the two-section design of the injection needle sleeve 7 can increase the reliability of the connection with the injection bottom plate 3. In addition, in order to increase the sealing performance of the injection needle sleeve 7 and the injection bottom plate 3, a groove is arranged at the upper end of the second column, and a sealing member is arranged in the groove, which can be an O-ring.

[0062] As a preferred technical solution, the outlet 42 of the injection channel of the injection needle 4 is arranged at the bottom of the injection channel 41 and is inclined downward, which guides the electrolyte to the accommodating chamber 6 while effectively preventing the electrolyte from accumulating at the bottom of the injection channel 41.

[0063] As a preferred technical solution, a groove is provided at the upper end of the injection needle 4, and a seal is provided inside the groove to enable the injection needle 4 to be sealingly and slidably connected to the inner wall of the injection base 2. Specifically, the seal may be an O-ring.

[0064] The present invention also discloses a vacuum liquid injection device, comprising: the vacuum liquid injection cup assembly as described above; also comprising a liquid seepage chamber, comprising four groups of liquid seepage chamber side panels 12, and the liquid seepage chamber side panels 12 are provided with an exhaust port for connecting to a vacuum pumping device and an air inlet for connecting to an external environment; a vacuum pumping device, connected to the exhaust port, for vacuuming the liquid seepage chamber; a cavity bottom plate 13, for carrying a battery shell to be injected; a second power assembly, connected to the cavity bottom plate 13, for driving the movement of the cavity bottom plate 13, so that the cavity bottom plate 13 has a sealed state of moving to the bottom of the liquid seepage chamber and a non-sealed state of being separated from the liquid seepage chamber. Specifically, the seepage cavity is composed of four groups of seepage cavity side plates 12, an upper liquid injection bottom plate 3 and a lower cavity bottom plate 13. In order to increase the sealing between the seepage cavity side plates 12, the liquid injection bottom plate 3 and the cavity bottom plate 13, a seal can be set on the contact surface; the vacuum device can be any device that can perform vacuum treatment on the sealed environment; since the injection needle 4 and the injection needle sleeve 7 are fixed in the horizontal direction and will not be offset relative to the seepage cavity, the position of the tray located on the cavity bottom plate 13 and the battery placed on the tray must be accurately oriented to the corresponding injection needle sleeve 7, so a baffle bar for guiding and limiting the tray is set on the cavity bottom plate 13;

[0065] As a preferred technical solution, the second power component includes: a fixed plate 15, which is fixedly set on the bracket 1 and its position is fixed relative to the bracket 1; a first guide shaft group, including at least two groups of first guide shafts 22, preferably including four groups of first guide shafts 22, which are respectively located at the four corners of the cavity bottom plate 13, and one end of each group of first guide shafts 22 is fixedly set on the cavity bottom plate 13, and the other end is sleeved in a through hole reserved on the fixed plate 15, and the first guide shaft 22 can move freely up and down in the through hole; a second driving member 20, which is connected to the cavity bottom plate 13, preferably, the second driving member 20 is a cylinder, and the piston rod of the cylinder is connected to the cavity bottom plate 13, which is used to drive the cavity bottom plate 13 to move toward or away from the seepage cavity.

[0066] As a preferred technical solution, the second power assembly also includes a first movable plate 14, which is fixedly connected to the movable end of the first guide shaft group, and a buffer 18 is provided on the side opposite to the first movable plate 14 or the fixed plate 15, which is used to limit the movement of the first movable plate 14. Specifically, the two ends of the first guide shaft 22 are respectively fixedly provided at the bottom of the cavity bottom plate 13 and the upper end of the first movable plate 14, and the fixed plate 15 is located between the cavity bottom plate 13 and the first movable plate 14, and a through hole is provided on the fixed plate 15 for the free movement of the first guide shaft 22, and a linear bearing is provided in the through hole to prevent wear between the two; a buffer limit block 19 is provided at the upper end of the first movable plate 14, and a buffer 18 facing the first movable plate 14 is provided on the fixed plate 15, and the movement of the first movable plate 14 and the first guide shaft 22 is limited and buffered by the buffer 18.

[0067] As a preferred technical solution, it also includes a positioning component, which is arranged at the bottom of the cavity bottom plate 13 and is used to position the tray of the battery shell to be filled with liquid placed on the cavity bottom plate 13. The positioning component includes: a third movable plate 17; a third driving member 21, which is connected to the third movable plate 17 and is used to drive the third movable plate 17 to move toward or away from the seepage cavity; a third guide shaft group, including at least two groups of third guide shafts 24, one end of the third guide shaft 24 is fixedly arranged on the third movable plate 17, and the other end is sealed and slidably connected to the preset through hole on the cavity bottom plate 13, and is arranged corresponding to the reserved hole on the tray. Specifically, as Fig.10 As shown, through holes are respectively provided at the four corners of the tray for carrying the batteries to be filled with liquid, the third movable plate 17 is arranged at the bottom of the cavity bottom plate 13, and four groups of third guide shafts 24 are respectively provided thereon at positions corresponding to the four through holes, and holes for the third guide shafts 24 to pass through are also provided at the positions of the four through holes of the tray at the bottom of the cavity. Driven by the third driving member 21, the third movable plate 17 can move toward the cavity bottom plate 13, and insert the third guide shafts 24 into the through holes of the tray through the cavity bottom plate 13, thereby realizing the positioning of the tray.

[0068] As a preferred technical solution, it also includes a second guide shaft group, which includes at least two groups of second guide shafts 23, preferably four groups of second guide shafts 23, one end of the second guide shaft 23 is fixedly set at the bottom of the third movable plate 17, and the other end is sleeved in a preset through hole of the second movable plate 16, and a linear bearing is arranged in the through hole of the second movable plate 16.

[0069] The working process of vacuum injection device: Figure 8 , Fig. 9 As shown, under the drive of the first driving member 10, the injection needle 4 is in a sealed state of being inserted into the injection needle sleeve 7, and then after the electrolyte is injected into the injection needle 4, the inlet at the upper end of the injection needle 4 is sealed, and the cavity bottom plate 13 moves upward under the drive of the second power component to seal the bottom of the seepage cavity, and the vacuum device performs a vacuum treatment on the formed sealed cavity. When the vacuum degree reaches a preset value, the injection needle 4 is driven upward by the first driving member 10, so that it is in an unsealed state without being inserted into the injection needle sleeve 7. At this time, the electrolyte in the accommodating cavity 6 enters the battery housing located in the vacuum environment through the injection hole 5 on the injection needle sleeve 7. After the injection is completed, the air inlet on the side plate 12 of the seepage cavity for connecting to the external environment is used to restore the internal pressure state, and then the second power component is driven to restore it to its original position, so as to facilitate the removal of the battery that has completed the injection and the placement of the next group of batteries to be injected.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A vacuum liquid injection cup assembly, characterized in that: include: Bracket (1); A liquid injection base (2) is fixedly arranged on the bracket (1), the liquid injection base (2) being a column and having at least one set of accommodating cavities (6) penetrating the upper and lower end surfaces arranged therein; A liquid injection bottom plate (3) is fixedly arranged on the bracket (1), the liquid injection bottom plate (3) is provided with at least one group of liquid injection holes (5), and each group of the liquid injection holes (5) is arranged corresponding to the accommodating cavity (6), and the liquid injection holes (5) include a first section in a closed shape, a second section with a constant inner diameter, and a third section in a closed shape; An injection needle (4) is disposed in the accommodating cavity (6) of the injection base (2) and is in sealing and sliding cooperation with the side wall of the accommodating cavity (6); the outer diameter of the lower end of the injection needle (4) is not less than the inner diameter of the second section of the injection hole (5); The injection needle (4) is provided with an injection channel (41) for containing electrolyte, and the outlet (42) of the injection channel is provided on the side wall of the injection needle (4) and is located at the containing cavity (6) of the injection base (2); A first power assembly is connected to the injection needle (4) and is used to drive the injection needle (4) to move within the injection base (2), so that the injection needle (4) has a first state in which it is inserted into and blocks the injection hole (5) and a second state in which it does not block the injection hole (5).

2. The vacuum filling cup assembly according to claim 1, characterized in that: The first power assembly comprises: Two groups of side plates (9) are provided, which are symmetrically arranged on both sides of the injection base (2); the side plates (9) are connected to the injection needle (4) via a slide rail-slider assembly (11), and the slide rail-slider assembly (11) is arranged at an angle; A connecting plate fixedly connected to the two sets of side plates (9); A first driving member (10) is connected to the connecting plate and is used to drive the movement of the connecting plate and two groups of side plates (9) fixedly connected to the connecting plate.

3. The vacuum liquid filling cup assembly according to claim 2, characterized in that: The first power assembly also includes a guide assembly for guiding the movement of the side plate (9).

4. The vacuum liquid filling cup assembly according to claim 1, characterized in that: The liquid injection base plate (3) is provided with a liquid injection needle sleeve (7), and the liquid injection needle sleeve (7) is fixedly arranged on a through hole preset on the liquid injection base plate (3); The injection hole (5) is provided on the injection needle sleeve (7).

5. The vacuum liquid filling cup assembly according to claim 4, characterized in that: The injection needle sleeve (7) comprises a first column and a second column, the first section of the injection hole (5) is arranged in the first column, the second section and the third section are arranged in sequence in the second column, and the size of the first column is larger than that of the second column.

6. The vacuum filling cup assembly according to claim 1, characterized in that: The outlet (42) of the injection channel of the injection needle (4) is arranged at the bottom of the injection channel (41) and is arranged in an inclined downward direction.

7. The vacuum liquid filling cup assembly according to claim 1 or 6, characterized in that: The upper end of the injection needle (4) is provided with a groove, and a sealing member is sleeved in the groove, so as to enable the injection needle (4) to be sealingly slidably connected to the inner wall of the injection base (2).

8. Vacuum liquid injection device, characterized in that: include: The vacuum liquid injection cup assembly according to any one of claims 1 to 7; A liquid seepage cavity, comprising four sets of liquid seepage cavity side panels (12), wherein the side panels are provided with an air extraction port for connecting to a vacuum extraction device and an air inlet for connecting to an external environment; A vacuum device, connected to the vacuum port, for vacuuming the liquid seepage cavity; The cavity bottom plate (13) is used to support the battery casing to be filled with liquid; A second power assembly is connected to the cavity bottom plate (13) and is used to drive the movement of the cavity bottom plate (13), so that the cavity bottom plate (13) has a sealed state in which it moves to the bottom of the seepage cavity and a non-sealed state in which it is separated from the seepage cavity.

9. The vacuum liquid injection device according to claim 8, characterized in that: The second power assembly comprises: A fixing plate (15) fixedly disposed on the bracket (1); A first guide shaft group, comprising at least two groups of first guide shafts (22), wherein one end of each group of the first guide shafts (22) is fixedly disposed on the cavity bottom plate (13), and the other end is sleeved in a through hole reserved on the fixed plate (15); The second driving member (20) is connected to the cavity bottom plate (13).

10. The vacuum liquid injection device according to claim 9, characterized in that: It also includes a first movable plate (14) fixedly connected to the movable end of the first guide shaft group, and a buffer (18) is provided on the side opposite to the first movable plate (14) or the fixed plate (15) for limiting the movement of the first movable plate (14).

11. The vacuum liquid injection device according to claim 9, characterized in that: It also includes a positioning component, which is arranged at the bottom of the cavity bottom plate (13) and is used to position the tray of the battery housing to be filled with liquid placed on the cavity bottom plate (13), and the positioning component includes: A third movable plate (17); A third driving member (21) connected to the third movable plate (17) and used for driving the third movable plate (17) to move towards or away from the seepage chamber; The third guide shaft group comprises at least two groups of third guide shafts (24), one end of each of the third guide shafts (24) being fixedly disposed on the third movable plate (17), and the other end of each of the third guide shafts (24) being sealingly slidably connected to a through hole preset on the cavity bottom plate (13), and being arranged corresponding to a reserved hole on the tray.

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