Electrolyte impregnation method, impregnation device and injection machine for pouch cells

Abstract

This invention provides a method, apparatus, and injection machine for impregnating a flexible battery cell with electrolyte. The method includes: S1: placing the injected battery cell assembly in a sealed environment (3) with the cell air bag (131) open; S2: setting the sealed environment (3) to a first vacuum value and then sealing the opening of the cell air bag (131); S3: setting the sealed environment (3) to a second vacuum value and maintaining pressure, wherein the second vacuum value is lower than the first vacuum value; S4: setting the sealed environment (3) to atmospheric pressure and maintaining pressure; S5: repeating steps S3 and S4 a set number of times to open the opening of the cell air bag (131); S6: setting the sealed environment (3) to a third vacuum value and sealing the cell air bag (131). The method for impregnating a flexible battery cell with electrolyte according to this invention can improve the impregnation speed and enhance the cell's electrolyte penetration effect.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and more specifically, to a method, apparatus and injection machine for impregnating electrolyte in a pouch cell. Background Technology

[0002] Soft-pack batteries have high energy density and good safety, and are widely used in daily life.

[0003] For battery cells with high energy density and large volume, it is more difficult for the cell electrodes, especially the electrodes in the middle of the cell, to absorb the electrolyte after electrolyte filling. In order to allow the electrolyte to be better absorbed by the electrodes, they are stored for a certain period of time.

[0004] Currently, the industry typically uses the method of directly vacuuming the inside of the battery after electrolyte injection and then sealing it, or leaving it open under vacuum for a certain period of time before sealing it. After the battery cell is sealed, it is stored at high temperature or room temperature for 1 to 2 days to achieve full immersion of electrolyte.

[0005] However, relying solely on the electrolyte to slowly permeate from the edges into the electrode is not only slow but also ineffective, leaving the middle of the cell dry even after several hours of electrolyte injection. Summary of the Invention

[0006] The main objective of this invention is to provide a method, apparatus, and injection machine for electrolyte impregnation of soft-pack battery cells, which can improve the electrolyte impregnation speed and enhance the electrolyte penetration effect of the battery cells.

[0007] To achieve the above objectives, according to one aspect of the present invention, a method for electrolyte impregnation of a pouch cell is provided, comprising the following steps:

[0008] S1: Place the injected battery cell assembly in a sealed environment, and keep the battery cell air bag open.

[0009] S2: Set the sealed environment to the first vacuum value, and then seal the opening of the cell air bag;

[0010] S3: Set the sealed environment to the second vacuum value and maintain the pressure, wherein the second vacuum value is lower than the first vacuum value;

[0011] S4: Set the sealed environment to normal pressure and maintain the pressure;

[0012] S5: Repeat steps S3 and S4 a set number of times to open the opening of the cell air bag;

[0013] S6: Set the sealed environment to the third vacuum value and seal the battery cell air bag.

[0014] As one implementation method, the sealed environment is a vacuum device.

[0015] As one implementation method, the pressure difference between the second vacuum value and the first vacuum value is less than the maximum allowable deformation force of the cell casing.

[0016] In one implementation, the difference between the second vacuum value and the first vacuum value ranges from 10 kPa to 80 kPa.

[0017] In one implementation, in step S2, the first vacuum value of the sealed environment is -10 kPa to -50 kPa.

[0018] In one implementation, in step S3, the second vacuum value of the sealed environment is -20 kPa to -90 kPa.

[0019] As one implementation method, in step S6, the third vacuum value of the sealed environment is -80KPa to -100KPa.

[0020] In one implementation, in step S3, the pressure holding time is 0-120s, or 5-100s, or 10-80s, or 20-60s.

[0021] In one implementation, in step S4, the pressure holding time is 0-120s, or 5-100s, or 10-80s, or 20-60s.

[0022] In one implementation, in step S5, the number of times is set to 0-10 times, or the number of times is set to 1-8 times, or the number of times is set to 2-5 times.

[0023] In one implementation, in step S6, the encapsulation temperature is 165-195℃ and the encapsulation time is 2-7s.

[0024] In one implementation, step S6 includes:

[0025] Seal the battery cell air bag; or, clamp the battery cell air bag first, and then seal the battery cell air bag.

[0026] According to another aspect of the present invention, a wetting apparatus for use in the above-described electrolyte wetting method for pouch cells is provided, comprising:

[0027] A closed environment, having a sealed cavity constructed to house the battery cell assembly;

[0028] The clamping cylinder is set on two opposite sides of a sealed environment. The clamping cylinder includes a cylinder and clamping plates. The clamping plates are set at the extension end of the cylinder and are located in the sealed cavity. The two clamping plates set opposite each other are used to clamp and release the opening of the battery cell air bag.

[0029] In one implementation, the clamping area of ​​the clamp can be any area of ​​the battery cell air bag.

[0030] In one implementation, the surface of the plywood is covered with a layer of soft material.

[0031] In one implementation, the enclosed environment is formed by side panels, a top panel, and a bottom panel.

[0032] In one implementation, the clamping cylinder is mounted on the side plate.

[0033] In one embodiment, the side plate includes a rear side plate, a front side plate, a right side plate, and a left side plate, with the clamping cylinder disposed on the left side plate and the right side plate.

[0034] In one implementation, the left and right side plates also have symmetrically arranged end cap cylinders for sealing the battery cell air bags.

[0035] In one embodiment, the telescopic end of the end cap cylinder is provided with an end cap base, and a heating block and an end cap are fixedly mounted on the end cap base. The heating block is used to heat the end cap.

[0036] In one embodiment, the immersion device also includes a lifting mechanism, which includes a lifting cylinder and a guide rod, and the sealed environment can slide along the guide rod under the action of the lifting cylinder.

[0037] In one implementation, the bottom of the sealed cavity in the enclosed environment is constructed with a cell fixing groove for placing the cell assembly.

[0038] According to another aspect of the present invention, a liquid injection machine is provided, including an injection needle and the aforementioned wetting device, wherein the injection needle is connected to the sealed environment of the wetting device.

[0039] According to the technical solution of the present invention, the electrolyte impregnation method for soft-pack battery cells includes: S1: placing the battery cell assembly after electrolyte injection in a sealed environment, and keeping the battery cell air bag open; S2: setting the sealed environment to a first vacuum value, and then sealing the opening of the battery cell air bag; S3: setting the sealed environment to a second vacuum value and maintaining pressure, wherein the second vacuum value is lower than the first vacuum value; S4: setting the sealed environment to normal pressure and maintaining pressure; S5: repeating steps S3 and S4 to a set number of times, and opening the opening of the battery cell air bag; S6: setting the sealed environment to a third vacuum value and sealing the battery cell air bag. The above-described method for electrolyte impregnation of soft-pack battery cells allows for the sealing of the battery cell after electrolyte injection by drawing a certain vacuum. Repeated vacuuming and devastating operations on the outside of the battery cell cause it to cyclically expand and contract, creating an effect similar to inhalation and exhalation. This accelerates the impregnation of the intermediate electrode plates. Through repeated expansion and compression, the electrolyte impregnation speed is effectively increased, improving the seepage effect and significantly shortening the time required for room temperature or high temperature storage after electrolyte injection and sealing to allow the electrolyte to impregnate the electrode plates. This shortens the battery cell production cycle, allows for the selective elimination of the post-injection settling process, reduces equipment manufacturing costs, saves equipment space, and improves production efficiency. Attached Figure Description

[0040] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0041] Figure 1 A flowchart of an embodiment of the electrolyte wetting method for soft-pack battery cells according to the present invention is shown;

[0042] Figure 2 A front view schematic diagram of the immersion apparatus according to an embodiment of the present invention is shown;

[0043] Figure 3 A top view of the immersion apparatus according to an embodiment of the present invention is shown;

[0044] Figure 4 An internal structural diagram of the immersion apparatus according to an embodiment of the present invention is shown;

[0045] Figure 5 An exploded structural diagram of the vacuum device of the immersion apparatus according to an embodiment of the present invention is shown;

[0046] Figure 6 A schematic diagram of the battery cell assembly is shown.

[0047] The above figures include the following reference numerals:

[0048] 1. Lifting cylinder; 2. Guide rod; 3. Sealed environment; 4. End cap cylinder; 5. Clamping plate cylinder; 6. Support plate; 7. Base plate; 8. End cap base; 9. Heating block; 10. End cap; 11. Clamping plate; 12. Soft material layer; 13. Battery cell; 14. Battery cell fixing groove; 31. Rear side plate; 32. Front side plate; 33. Right side plate; 34. Left side plate; 35. Top plate; 131. Battery cell air bag; 132. Sealing area; 133. Clamping area; 134. Battery cell housing. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] See also Figures 1 to 6 As shown, according to an embodiment of the present invention, the electrolyte impregnation method for pouch cells includes:

[0051] S1: Place the injected battery cell assembly in a sealed environment 3, and keep the battery cell air bag 131 open.

[0052] S2: Set the sealed environment 3 to the first vacuum value, and then seal the opening of the battery cell air bag 131;

[0053] S3: Set the sealed environment 3 to the second vacuum value and maintain the pressure, wherein the second vacuum value is lower than the first vacuum value;

[0054] S4: Set the closed environment 3 to normal pressure and maintain the pressure;

[0055] S5: Repeat steps S3 and S4 a set number of times to open the opening of the cell air bag 131;

[0056] S6: Set the sealed environment 3 to the third vacuum value and seal the battery cell air bag 131.

[0057] In this embodiment, the battery cell 13 includes an inner core and a battery cell housing 134, wherein the inner core is disposed within the battery cell housing 134, and the side of the battery cell housing 134 without the inner core is a battery cell air bag 131. The inner core has electrodes. After electrolyte is injected into the battery cell housing 134, the electrolyte wets the inner core, allowing the electrodes of the inner core to fully contact the electrolyte, thereby achieving a wetting effect.

[0058] This invention first places the electrolyte-filled battery cell 13 into a sealed environment 3, then evacuates the sealed environment 3 to a certain degree of vacuum, and then seals the battery cell air bag 131. After sealing, the sealed environment 3 is repeatedly evacuated and devastated, causing the battery cell 13 to cyclically expand and contract, producing an effect similar to breathing, which accelerates the wetting of the battery cell electrode sheets and allows the electrolyte to penetrate to the center of the electrode sheets. Through the repeated expansion and compression of the battery cell 13, the electrolyte wetting speed of the battery cell is effectively improved, the electrolyte penetration effect of the battery cell is improved, and the time required for the battery cell 13 to be stored at room temperature or high temperature after electrolyte filling and sealing to allow the electrolyte to wet the electrode sheets is significantly shortened. This shortens the battery cell production cycle, allows for the selective elimination of the post-filling settling process, reduces equipment manufacturing costs, saves equipment space, and improves production efficiency.

[0059] In this invention, after the battery cell is filled with electrolyte, the battery cell 13 is not clamped immediately. During the vacuuming process of the sealed environment 3, a certain vacuum is indirectly created inside the battery cell 13, maintaining a certain negative pressure inside the cell. Then, the battery cell 13 is clamped using clamps, sealing the opening of the battery cell air bag 131. Next, a vacuum is created in the sealed environment 3 outside the battery cell 13. At this point, because the battery cell 13 is sealed, the vacuum value outside the battery cell 13 is lower than the vacuum value inside the battery cell 13. This causes the battery cell casing 134 to expand, allowing the electrolyte to flow more easily to the center of the battery cell, which is more conducive to the wetting of the central electrode.

[0060] After maintaining this state for a certain period of time, the vacuum in the sealed environment 3 outside the battery cell 13 is released. Since the battery cell 13 remains sealed, the vacuum value of the sealed environment 3 outside the battery cell 13 is greater than the vacuum value inside the battery cell 13. The battery cell casing 134 is compressed, allowing the electrolyte to more fully wet the middle electrode of the inner core.

[0061] By repeating the above steps multiple times, the central electrode of the internal core of the battery cell 13 fully contacts the electrolyte, thereby accelerating the seepage rate and reducing the storage time at room temperature or high temperature after sealing, thus shortening the battery cell manufacturing cycle.

[0062] In one embodiment, the sealed environment 3 is a vacuum device. The vacuum device is, for example, a vacuum chamber.

[0063] In one embodiment, the pressure difference between the second vacuum value and the first vacuum value is less than the maximum allowable deformation force of the cell casing.

[0064] In this embodiment, the expansion force of the cell casing comes from the pressure difference between the first vacuum value and the second vacuum value, and the compression force of the cell casing comes from the pressure difference between atmospheric pressure and the first vacuum value. When the cell casing expands, if the pressure difference between the first vacuum value and the second vacuum value is too large, it will lead to an excessive expansion force of the cell casing. If this expansion force exceeds the maximum allowable deformation force of the cell casing, it will cause excessive expansion and deformation of the cell casing, resulting in irreversible deformation. This will damage the structure of the cell casing, making it unable to adapt to subsequent expansion and compression operations, and will also damage the performance of the cell casing. Therefore, when designing the internal and external pressure difference of the cell casing, it is necessary to consider the maximum allowable deformation force of the cell casing and design the pressure difference between the first vacuum value and the second vacuum value accordingly. This ensures that the cell casing can achieve expansion and compression, effectively expanding and compressing the internal core of the cell 13, accelerating the electrolyte wetting speed and efficiency, while avoiding irreversible deformation of the cell 13, and ensuring the working performance and service life of the cell 13.

[0065] In one embodiment, the pressure difference between the second vacuum value and the first vacuum value is less than the maximum allowable deformation force of the cell housing 134.

[0066] In one embodiment, the difference between the second vacuum value and the first vacuum value ranges from 10 kPa to 80 kPa.

[0067] In this embodiment, the maximum and minimum values ​​of the difference between the second vacuum value and the first vacuum value are limited. On the one hand, this can prevent the difference from being too small, resulting in insufficient expansion force of the cell casing and failure to expand fully. On the other hand, it can prevent the expansion force of the cell casing from being too large, resulting in damage to the cell 13.

[0068] In one embodiment, the first vacuum value is between -10 kPa and -50 kPa.

[0069] In one embodiment, the second vacuum value is -20 kPa to -90 kPa.

[0070] In one embodiment, the pressure holding time in step S3 is 0-120s.

[0071] In one embodiment, the pressure holding time in step S4 is 0-120s.

[0072] In one embodiment, in step S5, the number of times is set to 0-10.

[0073] In one embodiment, in step S6, the encapsulation temperature is 165-195℃ and the encapsulation time is 2-7s.

[0074] In one embodiment, in step S6, the third vacuum value of the sealed environment 3 is -80 kPa to -100 kPa.

[0075] By limiting various parameters in the electrolyte impregnation process of the battery cell, it can be ensured that each step of the impregnation process is achieved with reasonable parameters, thus ensuring the effective and smooth progress of the entire impregnation process and guaranteeing the impregnation effect and quality of the battery cell.

[0076] In one embodiment, in step S6, the cell air bag 131 is sealed in the sealing area 132.

[0077] In one embodiment, in step S6, the battery cell air bag 131 is first clamped, and then the battery cell air bag is sealed in the sealing area 132.

[0078] In this embodiment, before sealing the battery cell air bag 131, the clamping area 133 of the battery cell air bag 131 is squeezed and sealed by the clamping plate 11. Therefore, the clamping area 133 of the air bag can become flatter under the action of the clamping plate 11. When sealing with the sealing head 10, the problem of poor sealing wrinkles can be reduced, the sealing strength can be improved, and the risk of leakage can be reduced.

[0079] See also Figures 2 to 6 As shown in the embodiment of the present invention, the impregnation device of the above-mentioned soft-pack battery cell electrolyte impregnation method includes: a sealed environment 3 having a sealed cavity configured to accommodate the battery cell assembly; and clamping cylinders 5 disposed on two opposite sides of the sealed environment 3. The clamping cylinders 5 include a cylinder and clamping plates 11, the clamping plates 11 being disposed at the extension end of the cylinder and located within the sealed cavity. The two clamping plates 11 disposed opposite to each other are used to clamp and release the opening of the battery cell air bag 131.

[0080] In this embodiment, the immersion device includes a clamping cylinder 5, which includes a cylinder and a clamping plate 11. During the immersion of the battery cell electrolyte, the cylinder and the clamping plate 11 work together to clamp and seal the battery cell air bag 131 after the vacuum inside the battery cell housing 134 reaches a first vacuum value. During this sealing process, the battery cell air bag 131 is not actually sealed. When the clamping plate 11 is opened, the battery cell air bag 131 will also open. Here, the battery cell air bag 131 is sealed by the clamping force of the clamping plate 11 and does not have a sealing effect on its own.

[0081] The purpose of this structure is to keep the pressure inside the cell housing at the first vacuum value, which facilitates the expansion and compression of the cell 13, improves the wetting speed and effect of the electrolyte, and allows the clamping plate 11 to be loosened after the cell 13 has been wetted, so that the pressure inside the cell housing meets the sealing pressure of the cell 13, and then the cell 13 is sealed, so as to realize convenient adjustment of the pressure inside the cell housing at different stages.

[0082] In one embodiment, a soft material layer 12 is attached to the surface of the clamping plate 11. The flexibility of the soft material layer 12 can be used to improve the sealing effect of the clamping plate 11 on the battery cell air bag 131, and ensure the clamping and sealing effect of the clamping plate 11 on the battery cell air bag 131.

[0083] The soft material layer 12 is made of materials such as silicone, rubber, or foam.

[0084] In one embodiment, the enclosed environment 3 is formed by a side panel, a top panel 35, and a bottom panel 7.

[0085] In one embodiment, the clamping cylinder 5 is disposed on the side plate, and the clamping cylinder 5 can be used to clamp and seal the battery cell air bag 131 from both sides, which facilitates operation.

[0086] In one embodiment, the side plate includes a rear side plate 31, a front side plate 32, a right side plate 33, and a left side plate 34, with the clamping cylinder 5 disposed on the left side plate 34 and the right side plate 33.

[0087] In one embodiment, the left side plate 34 and the right side plate 33 are also symmetrically provided with end cap cylinders 4 for sealing the battery cell air bag 131.

[0088] In one embodiment, the telescopic end of the end cap cylinder 4 is provided with an end cap base 8, and a heating block 9 and an end cap 10 are fixedly provided on the end cap base 8. The heating block 9 is used to heat the end cap 10.

[0089] The sealing cylinder 4 can heat and seal the sealing area 132 of the battery cell air bag 131, thereby facilitating the sealing operation of the battery cell 13.

[0090] The immersion device also includes a lifting mechanism, which includes a support plate 6, a lifting cylinder 1, and a guide rod 2. The guide rod 2 is fixedly mounted on the support plate 6, and the sealed environment 3 can slide along the guide rod 2. The lifting cylinder 1 is fixed on the support plate 6, and the telescopic end of the lifting cylinder 1 is connected to the top plate 35.

[0091] In one embodiment, the lifting mechanism includes a support plate 6, a lifting cylinder 1, and a guide rod 2. The support plate 6 is fixed on the mounting base or mounting platform and provides support for the installation of the lifting cylinder 1, the guide rod 2, and the sealed environment 3. The guide rod 2 is fixed on the support plate 6 and works with the lifting cylinder 1 to guide the lifting and lowering of the sealed environment 3. The lifting cylinder 1 is fixed on the support plate 6, and the telescopic end of the lifting cylinder 1 is connected to the top plate 35. By controlling the extension and retraction of the rod of the lifting cylinder 1, the lifting and lowering position of the sealed environment 3 can be controlled.

[0092] To ensure the sealing effect of the enclosed environment 3, sealing structures such as sealing rings can be installed at the mating positions between the side plate and the bottom plate 7.

[0093] In one embodiment, the bottom of the sealed cavity of the enclosed environment 3 is provided with a cell fixing groove 14 for placing the cell assembly.

[0094] In one embodiment, the width of the cell fixing groove 14 is greater than the width of the cell assembly, and the width difference between the two ranges from 0 to 30 mm.

[0095] In one embodiment, the width of the cell fixing groove 14 is 5-20 mm wider than the width of the cell assembly.

[0096] In one embodiment, the clamping area 133 of the clamping plate 11 for the battery cell air bag 131 is any area of ​​the battery cell air bag 131.

[0097] In one embodiment, the distance d between the encapsulation position of the battery cell air bag 131 and the clamping area of ​​the battery cell air bag 131 is 5-20mm.

[0098] In one embodiment, the impregnation device may only include a sealed environment 3 and a clamping cylinder 5, while the sealing cylinder 4 may be located in other positions. That is, the impregnation device only performs the impregnation operation of the battery cell, and the sealing operation of the battery cell is performed in other processes.

[0099] According to an embodiment of the present invention, the injection machine includes an injection needle and the aforementioned wetting device. The injection needle is connected to the sealed environment 3 of the wetting device, that is, the injection needle is connected to the top plate 35.

[0100] In one embodiment, the wetting device can be integrated into the liquid injection machine, including a sealed environment 3 and a clamping cylinder 5, but excluding the sealing cylinder 4 for sealing the battery cell 13, and the sealing operation of the battery cell is performed in other processes.

[0101] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0102] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for electrolyte impregnation of a soft-pack battery cell, characterized in that, In order, they include: S1: Place the injected battery cell assembly in a sealed environment (3) and keep the battery cell air bag (131) open. S2: Set the sealed environment (3) to the first vacuum value, and then seal the opening of the cell gas bag (131); S3: Set the sealed environment (3) to the second vacuum value and maintain the pressure, wherein the second vacuum value is lower than the first vacuum value; S4: Set the closed environment (3) to normal pressure and maintain the pressure; S5: Repeat steps S3 and S4 a set number of times to open the opening of the cell air bag (131); S6: Set the sealed environment (3) to the third vacuum value and seal the battery cell gas bag (131).

2. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, The sealed environment (3) is a vacuum device.

3. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, The pressure difference between the second vacuum value and the first vacuum value is less than the maximum allowable deformation force of the cell casing (134).

4. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, The difference between the second vacuum value and the first vacuum value ranges from 10 kPa to 80 kPa.

5. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, In step S2, the first vacuum value is -10 kPa to -50 kPa.

6. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, In step S3, the second vacuum value is -20 kPa to -90 kPa.

7. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, In step S6, the third vacuum value of the sealed environment (3) is -80KPa to -100KPa.

8. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, In step S3, the pressure holding time is 0-120s.

9. The method for electrolyte impregnation of soft-pack battery cells according to claim 1, characterized in that, In step S4, the pressure holding time is 0-120s.

10. The method for electrolyte impregnation of a soft-pack battery cell according to claim 1, characterized in that, In step S5, the number of times is set to 0-10.

11. The method for electrolyte impregnation of a soft-pack battery cell according to claim 1, characterized in that, In step S6, the encapsulation temperature is 165-195℃ and / or the encapsulation time is 2-7s.

12. The method for electrolyte impregnation of a pouch cell according to any one of claims 1 to 11, characterized in that, Step S6 includes: Seal the battery cell air bag (131); or, first clamp the battery cell air bag (131) and then seal the battery cell air bag (131).

13. A wetting apparatus for the electrolyte wetting method of a pouch cell according to any one of claims 1 to 12, characterized in that, include: The enclosed environment (3) has a sealed cavity constructed to house the battery cell assembly; Clamping cylinder (5) is provided on two opposite sides of the sealed environment (3). The clamping cylinder (5) includes a cylinder and clamping plates (11). The clamping plates (11) are provided at the extension end of the cylinder and located in the sealed cavity. The two clamping plates (11) provided opposite to each other are used to clamp and release the opening of the battery cell air bag (131). The enclosed environment (3) is formed by side panels, top panel (35) and bottom panel (7); The clamping cylinder (5) is mounted on the side plate; The side plate includes a rear side plate (31), a front side plate (32), a right side plate (33) and a left side plate (34), and the clamping cylinder (5) is disposed on the left side plate (34) and the right side plate (33); The left side plate (34) and the right side plate (33) are also symmetrically provided with end cap cylinders (4) for sealing the battery cell air bag (131).

14. The wetting apparatus according to claim 13, characterized in that, The distance d between the sealing area (132) of the battery cell air bag (131) and the clamping area (133) of the battery cell air bag (131) is 5-20mm.

15. The wetting apparatus according to claim 13, characterized in that, The surface of the clamp (11) is covered with a soft material layer (12).

16. The wetting apparatus according to claim 13, characterized in that, The telescopic end of the end cap cylinder (4) is provided with an end cap base (8), and a heating block (9) and an end cap (10) are fixedly provided on the end cap base (8). The heating block (9) is used to heat the end cap (10).

17. The wetting apparatus according to claim 13, characterized in that, The immersion device also includes a lifting mechanism, which includes a lifting cylinder (1) and a guide rod (2). The sealed environment (3) can slide along the guide rod (2) under the action of the lifting cylinder (1).

18. The wetting apparatus according to claim 13, characterized in that, The bottom of the sealed cavity of the enclosed environment (3) is provided with a cell fixing groove (14) for placing the cell assembly.

19. A liquid injection machine, comprising an injection needle, characterized in that, It also includes the immersion device according to any one of claims 13 to 18, wherein the injection needle is connected to the sealed environment (3) of the immersion device.

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