Battery cell liquid injection device

Abstract

The embodiment of the invention provides a battery cell liquid injection device, and relates to the technical field of battery manufacturing. The device comprises a bottom plate, a support column, a buffer assembly, a buckle assembly, a battery cell positioning assembly and a liquid injection assembly, one end of the supporting column is fixed to the bottom plate, the other end of the supporting column is connected with a buffering assembly and a buckle assembly, a limiting protrusion is arranged between the two ends of the supporting column, the buckle assembly can move to fasten or release the liquid injection assembly, and the buffering assembly abuts against the liquid injection assembly and provides vertically upward elastic buffering force; the battery cell positioning assembly is fixed on the bottom plate or fixed at the position of the limiting bulge, and the battery cell positioning assembly is used for fixing a battery cell. When the battery cell positioning assembly is fixed on the bottom plate, the battery cell positioning assembly can be used for liquid injection of a blade battery cell, and when the battery cell positioning assembly is fixed on the limiting bulge, the battery cell positioning assembly can be used for liquid injection of a square battery cell, so that the battery cell liquid injection device is compatible with battery cells of different types and sizes. In addition, the buffering assembly upwards abuts against the liquid injection assembly, buffering and weight reduction are conducted on the liquid injection assembly, and the battery cell is prevented from being crushed.

Description

Technical Field

[0001] The present application belongs to the field of battery manufacturing technology, and specifically relates to a battery cell liquid injection device. Background Art

[0002] With the continuous development and innovation of new energy technologies, the market demand for power battery products is increasing, especially battery cell capacity and endurance performance, which have become research focuses. In the battery manufacturing process, the purpose of injecting electrolyte into the battery is to ensure that sufficient ions can migrate between the positive and negative electrodes during the battery's charge and discharge process. The quality of the electrolyte injection determines the quality of the battery performance.

[0003] In the related art, the same set of liquid filling tray devices cannot be compatible with battery cells of different specifications and sizes, for example, it cannot produce blade battery cells and square battery cells at the same time. The battery cells produced are relatively single. When the type of battery cells is changed, the liquid filling tray device needs to be replaced, thereby increasing the manufacturing cost. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a battery cell liquid filling device that can solve the problem that the same set of liquid filling tray devices cannot be compatible with battery cells of different specifications and sizes.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The embodiment of the present application provides a battery cell liquid injection device, including a base plate, a support column, a buffer assembly, a snap assembly, a battery cell positioning assembly and a liquid injection assembly;

[0007] One end of the support column is fixed to the base plate, and the other end of the support column is connected to the buffer assembly and the buckle assembly. A limiting protrusion is provided between the two ends of the support column. The buckle assembly is movable to fasten or release the injection assembly. The buffer assembly abuts against the injection assembly to provide a vertical upward elastic buffering force.

[0008] The battery cell positioning assembly is fixed on the bottom plate or on the limiting protrusion, and the battery cell positioning assembly is used to fix the battery cell.

[0009] Optionally, the battery cell positioning assembly includes a mounting plate, a first positioning member and a second positioning member;

[0010] The mounting plate is fixed on the base plate, the first positioning member and the second positioning member are fixed on the mounting plate and are spaced apart along the length or width direction of the mounting plate, the first positioning member is used to support the bottom of the battery cell, and the second positioning member is used to fix the middle of the battery cell.

[0011] Optionally, the battery cell positioning assembly includes a support plate and a third positioning member;

[0012] The support plate is fixed on the limiting protrusion, the third positioning member is fixed on the first surface of the support plate, and the third positioning member is used to support the bottom of the battery cell.

[0013] Optionally, the buffer assembly includes a first mounting post, a positioning pin and an elastic member;

[0014] One end of the first mounting column is fixedly connected to the support column, and the other end is connected to the positioning pin and the elastic member. The positioning pin is locked and connected to the liquid injection assembly, and the elastic force direction of the elastic member is vertically upward.

[0015] Optionally, the battery cell positioning assembly further includes a connector;

[0016] There are at least two mounting plates, the connecting member is connected between the at least two mounting plates, and the first positioning member and the second positioning member on the at least two mounting plates are arranged opposite to each other.

[0017] Optionally, the battery cell positioning assembly further includes a limiting member;

[0018] The limiting member is fixed to the second surface of the support plate, and a fastener is provided between the limiting member and the limiting protrusion.

[0019] Optionally, the buckle assembly includes a second mounting post and a movable member;

[0020] The second mounting post has a mounting groove, and the movable member is arranged in the mounting groove and is rotatably connected to the second mounting post to be in an expanded or retracted state.

[0021] Optionally, there are at least three mounting plates, and the accommodation space between two adjacent mounting plates is used to fix a row of the battery cells.

[0022] Optionally, there are at least three third positioning members, and the accommodation space between two adjacent third positioning members is used to fix a row of the battery cells.

[0023] Optionally, weight-reducing holes are provided on the mounting plate.

[0024] The battery cell injection device provided in the embodiment of the present application has a support column with the lower end fixed on the base plate, a buffer assembly and a snap assembly connected to the upper end, and a limiting protrusion provided in the middle of the support column. When the battery cell positioning assembly is fixed on the base plate, the vertical dimension of the battery cell positioning assembly is relatively large, and can be used to fix the blade battery cell and cooperate with the injection assembly to achieve battery cell injection; when the battery cell positioning assembly is fixed on the limiting protrusion, the vertical dimension of the battery cell positioning assembly is relatively small, and can be used to fix the square battery cell and cooperate with the injection assembly to achieve battery cell injection. Therefore, it is compatible with battery cells of different types and sizes, including blade batteries and square batteries. In addition, the snap assembly can be expanded to release the injection assembly, or tightened to fasten the injection assembly, and at the same time cooperate with the buffer assembly to support the injection assembly upward, to cushion and reduce the weight of the injection assembly, and to prevent the injection nozzle in the injection assembly and the battery cell injection hole from forming overpressure and damaging the battery cell injection hole.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic structural diagram of the first battery cell liquid injection device provided in an embodiment of the present application;

[0028] Figure 2 This is a structural schematic diagram of a second battery cell liquid injection device provided in an embodiment of the present application;

[0029] Figure 3 This is a schematic structural diagram of the first battery cell positioning assembly according to an embodiment of the present application;

[0030] Figure 4 This is a schematic diagram of the structure of the second battery cell positioning assembly according to an embodiment of the present application;

[0031] Figure 5 This is a schematic structural diagram of a tray assembly according to an embodiment of the present application;

[0032] Figure 6 This is an embodiment of the present application Figure 5 A locally enlarged schematic diagram of position Ⅰ in FIG.

[0033] Description of reference numerals:

[0034] 1-tray assembly, 11-bottom plate, 12-support column, 121-limiting protrusion, 1211-second positioning hole, 13-buffer assembly, 131-first mounting column, 132-positioning pin, 133-elastic member, 14-snap assembly, 141-second mounting column, 1411-mounting slot, 142-movable member, 2-battery cell positioning assembly, 21-mounting plate, 211-weight reduction hole, 212-flanging, 22-first positioning member, 23-second positioning member, 24-connecting member, 25-support plate, 26-third positioning member, 27-limiting member, 271-first positioning hole, 3-liquid injection assembly, 4-battery cell. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0037] The battery cell liquid injection device provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0038] Reference Figure 1 and Figure 2 , an embodiment of the present application provides a battery cell liquid injection device, including a base plate 11, a support column 12, a buffer assembly 13, a snap assembly 14, a battery cell positioning assembly 2 and a liquid injection assembly 3; one end of the support column 12 is fixed on the base plate 11, and the other end of the support column 12 is connected to the buffer assembly 13 and the snap assembly 14, and a limiting protrusion 121 is provided between the two ends of the support column 12, and the snap assembly 14 is movable to fasten or release the liquid injection assembly 3, and the buffer assembly 13 abuts against the liquid injection assembly 3 to provide a vertical upward elastic buffering force; the battery cell positioning assembly 2 is fixed on the base plate 11 or fixed at the limiting protrusion 121, and the battery cell positioning assembly 2 is used to fix the battery cell 4.

[0039] Specifically, the battery cell injection device provided in the embodiment of the present application includes a tray assembly 1, a battery cell positioning assembly 2 and an injection assembly 3, wherein, Figure 5 As shown, the tray assembly 1 includes a base plate 11, a support column 12, a buffer assembly 13 and a snap assembly 14. The support column 12 can be designed to be one, two or more. The embodiment of the present application designs four support columns 12 distributed in an array, two of which are distributed along the X direction and two along the Y direction. This distribution method is balanced in force and firmly fixed. The lower end of the support column 12 is fixed to the base plate 11, and the upper end is connected to the buffer assembly 13 and the snap assembly 14. The snap assembly 14 can be movable to an expanded or retracted state. When the snap assembly 14 is expanded, the liquid injection assembly 3 can be released to remove the liquid injection assembly 3. When the snap assembly 14 is retracted, the liquid injection assembly 3 can be tightened and fixed. That is, the detachability of the liquid injection assembly 3 is achieved through the movement of the snap assembly. When the liquid injection assembly 3 is tightened and fixed, the buffer assembly 13 pushes the liquid injection assembly 3 upward, which can cushion and reduce the weight of the liquid injection assembly 3, and avoid the formation of overpressure between the liquid injection nozzle in the liquid injection assembly 3 and the liquid injection hole of the battery cell 4, thereby damaging the liquid injection hole of the battery cell. The liquid injection assembly 3 includes a plurality of liquid injection cups, each of which has a liquid injection nozzle for electrolyte injection. The internal support structure of the liquid injection cup is designed to ensure a large liquid injection volume while meeting the requirement of not deforming under high vacuum conditions. During the electrolyte injection process, the liquid injection nozzle and the center of the liquid injection hole of the battery cell coincide and seal. For battery cells of different specifications and sizes, the liquid injection assembly 3 and the tray assembly 1 are universal equipment and do not need to be replaced. The battery cell positioning assembly 2 has different designs according to the different specifications and sizes of battery cells, and is suitable for square battery cells or blade battery cells.

[0040] Specifically, Figure 5 As shown, a limiting protrusion 121 is provided in the middle of the support column 12. Figure 1 As shown, when the battery cell positioning assembly 2 is fixed on the bottom plate 11, the upper part of the battery cell positioning assembly 2 is the liquid injection assembly 3. Therefore, the battery cell positioning assembly 2 of this structure has a larger size in the vertical direction Z, and can be used to fix the slender blade battery cell. Figure 2 As shown, when the cell positioning assembly 2 is fixed at the limiting protrusion 121, the structural position of the liquid injection assembly 3 on the upper part of the cell positioning assembly 2 remains unchanged. Compared with the first case, the cell positioning assembly 2 of this structure is smaller in the vertical Z direction and can be used to fix short square cells. Therefore, the different structures and fixed positions of the cell positioning assembly 2 can be compatible with different specifications and sizes of cells to meet their injection requirements, such as blade cells and square cells.

[0041] The battery cell injection device provided in the embodiments of the present application utilizes a common injection assembly and tray assembly. The battery cell positioning assembly is designed with two sets of structures and fixed positions, making it compatible with battery cells of different sizes, including blade cells and square cells. This allows for rapid product switching and reduces the cost of the injection manufacturing process. Furthermore, when the clip assembly is tightened, the buffer assembly supports the injection assembly upward, providing a buffer and reducing its weight, preventing overpressure from forming between the injection nozzle and the battery cell injection port, which could damage the port.

[0042] Optionally, refer to Figure 3 The battery cell positioning assembly 2 includes a mounting plate 21, a first positioning member 22 and a second positioning member 23; the mounting plate 21 is fixed on the base plate 11, the first positioning member 22 and the second positioning member 23 are fixed on the mounting plate 21, and are spaced apart along the length or width direction of the mounting plate 21. The first positioning member 22 is used to support the bottom of the battery cell 4, and the second positioning member 23 is used to fix the middle of the battery cell 4.

[0043] Specifically, if Figure 3 A battery cell positioning assembly for fixing blade batteries is shown. In this case, the battery cell positioning assembly 2 includes a mounting plate 21, a first positioning member 22, and a second positioning member 23. The surface of the mounting plate 21 is along the YZ plane, and the mounting plate 21 is fixed to the base plate 11 by the flange 212 at the bottom. In addition, along the Y direction, each mounting plate 21 is clamped between two support columns 12, and the mounting plate 21 is locked and fixed to the base plate 11 and the support columns 12 by pin positioning. The first positioning member 22 and the second positioning member 23 are fixed to the mounting plate 21, and the first positioning member 22 and the second positioning member 23 are distributed along the Z direction, wherein the first positioning member 22 is located at the bottom for fixing the bottom of the battery cell 4, and the second positioning member 23 is located at the top for fixing the middle position of the battery cell 4. The number of the first positioning member 22 and the second positioning member 23 on each mounting plate 21 can be one, two, or more. The Z-fixed height of the first positioning member 22 on each mounting plate 21 is consistent, and the Z-fixed height of the second positioning member 23 on each mounting plate 21 is consistent. Because the blade battery cell is slender, at least two positioning members are provided in the Z-direction of its length to ensure that the battery cell is fixed in position and avoid displacement and shaking during the injection process. The first positioning member 22 is "L"-shaped or a three-dimensional shape formed by three mutually orthogonally connected plates, and the second positioning member 23 is "L"-shaped.

[0044] It should be noted that the mounting plate 21 is detachably connected to the first and second positioning members 22 and 23 via pins. If blade cells of varying widths, thicknesses, or heights are required, the specifications and mounting positions of the first and second positioning members 22 and 23 can be selected based on the cell's dimensions. For example, if the blade cells are taller, the distance between the first and second positioning members 22 and 23 can be increased.

[0045] Optionally, refer to Figure 4 The battery cell positioning assembly 2 includes a support plate 25 and a third positioning member 26; the support plate 25 is fixed on the limiting protrusion 121, and the third positioning member 26 is fixed on the first surface of the support plate 25, and the third positioning member 26 is used to support the bottom of the battery cell 4.

[0046] Specifically, if Figure 4 Another battery cell positioning assembly for fixing square battery cells is shown. In this case, the battery cell positioning assembly 2 includes a support plate 25 and a third positioning member 26. The support plate 25 is fixed to the upper part of the limiting protrusion 121, and the third positioning member 26 is fixed to the upper surface of the support plate 25. Since the square battery cells are relatively "short" and the size along the Z direction is small, at least two third positioning members 26 are provided along the X direction or the Y direction. The third positioning member 26 can be in a three-dimensional shape formed by three mutually orthogonally connected flat plates, ensuring the fixing effect on the battery cell 4 in three directions. The support plate 25 is clamped between the two support columns 12, and the support plate 25 and the support column 12 are locked and fixed by pin positioning.

[0047] Optionally, refer to Figure 5 and Figure 6 The buffer assembly 13 includes a first mounting column 131, a positioning pin 132 and an elastic member 133; one end of the first mounting column 131 is fixedly connected to the support column 12, and the other end is connected to the positioning pin 132 and the elastic member 133, the positioning pin 132 is locked and connected to the injection assembly 3, and the elastic force direction of the elastic member 133 is vertically upward.

[0048] Specifically, if Figure 5 and Figure 6 As shown, the lower end of the first mounting column 131 is fixed to the upper end of the support column 12, and the upper end of the first mounting column 131 is connected with a positioning pin 132 and an elastic member 133. The positioning pin 132 is located in the middle, and an elastic member 133 is provided on each side. The positioning pin 132 plays a positioning and guiding role, and cooperates with the pin in the injection component 3 to adjust the installation height of the injection component 3 and limit the fixation. The elastic member 133 is a stainless steel spring, and its elastic force direction is vertically upward. When the positioning pin 132 is fixed to the injection component 3 and the injection component 3 is fastened by the snap assembly 14, the elastic member 133 applies a vertical upward reverse elastic force to the injection cup of the injection component 3 to prevent the injection component 3 from relying on its own gravity to press onto the battery cell injection port, causing damage to the battery cell 4, and affecting the airtightness between the injection component 3 and the battery cell 4. The first mounting column 131 and the support column 12 are both "I" shaped.

[0049] Optionally, refer to Figure 3The cell positioning assembly 2 also includes a connector 24; there are at least two mounting plates 21, the connector 24 is connected between at least two mounting plates 21, and the first positioning member 22 and the second positioning member 23 on at least two mounting plates 21 are relatively arranged.

[0050] Specifically, if Figure 3 As shown, in the battery cell positioning assembly 2 for securing blade batteries, in this embodiment of the present application, at least two mounting plates 21 are provided, and adjacent mounting plates 21 are connected by connectors 24. Because the mounting plates 21 are relatively large in the Y and Z directions, connectors 24 are provided to enhance the stability and reliability of the connection between the multiple mounting plates 21. The first positioning members 22 on different mounting plates 21 have a consistent Z-direction height, and the second positioning members 23 on different mounting plates 21 have a consistent Z-direction height. Connectors 24 can be plate-shaped or strip-shaped, extending in the X direction.

[0051] Optionally, refer to Figure 4 The battery cell positioning assembly 2 further includes a limiting member 27 ; the limiting member 27 is fixed to the second surface of the support plate 25 , and a positioning pin is provided between the limiting member 27 and the limiting protrusion 121 .

[0052] Specifically, if Figure 4 As shown, in the cell positioning assembly 2 for fixing square cells, the limiting member 27 is fixed to the lower surface of the support plate 25. The limiting member 27 is pressed against the limiting protrusion 121, and a fastener such as a pin is inserted between the first positioning hole 271 of the limiting member 27 and the second positioning hole 1211 of the limiting protrusion 121 to lock the cell positioning assembly 2 and the support column 12. The cell positioning assembly 2 can be quickly installed and removed by inserting and removing the pin.

[0053] Optionally, refer to Figure 5 and Figure 6 The buckle assembly 14 includes a second mounting column 141 and a movable member 142; the second mounting column 141 has a mounting groove 1411, and the movable member 142 is arranged in the mounting groove 1411 and is rotatably connected to the second mounting column 141, in an expanded or retracted state.

[0054] Specifically, if Figure 5 and Figure 6As shown, the buckle assembly 14 includes a second mounting post 141 and a movable part 142, and the movable part 142 is a movable buckle. The second mounting post 141 has a mounting groove 1411 extending along the Z direction. The movable part 142 is arranged in the mounting groove 1411, and a rotating shaft is passed between the movable part 142 and the second mounting post 141, so that the movable part 142 can rotate around the rotating shaft relative to the second mounting post 141. The operator pushes the movable part 142 outward so that the movable part 142 is in an expanded state, and the injection assembly 3 can be removed at this time. When the operator releases the movable part 142, the movable part 142 is retracted inward under the drive of the rotating shaft until the top of the movable part 142 presses the injection assembly 3 to limit and fix the injection assembly 3. When the movable member 142 is positioned to secure the liquid injection assembly 3, the positioning pin 132 engages and secures the pin in the liquid injection assembly 3, while the elastic member 133 exerts a vertical upward reverse elastic force on the liquid injection cup of the liquid injection assembly 3. This, while securing the liquid injection assembly 3 and ensuring the tightness of the liquid injection port, prevents the liquid injection assembly 3 from crushing the battery cell 4. The movable member 142 forms a snap lock under the sealed condition, making the battery cell liquid injection device an independent sealed device that can perform cyclic liquid injection function.

[0055] Optionally, refer to Figure 3 There are at least three mounting plates 21 , and the accommodation space between two adjacent mounting plates 21 is used to fix a row of battery cells 4 .

[0056] Specifically, if Figure 3 As shown, the cell positioning assembly 2 for securing blade cells is designed with at least three mounting plates 21. In the embodiment of the present application, there are three mounting plates 21, with a receiving space formed between two adjacent mounting plates 21. The first positioning members 22 and second positioning members 23 of two adjacent mounting plates 21 are arranged opposite each other to secure a row of cells. A row of cells includes multiple individual cells distributed along the Y direction. Therefore, the embodiment of the present application can secure two rows of cells using three mounting plates 21.

[0057] Optionally, refer to Figure 4 There are at least three third positioning members 26 , and the accommodation space between two adjacent third positioning members 26 is used to fix a row of the battery cells 4 .

[0058] Specifically, if Figure 4 As shown, in the battery cell positioning assembly 2 for fixing square battery cells, there are at least three third positioning members 26, and the accommodation space between two adjacent third positioning members 26 is used to fix a row of battery cells. In the embodiment of the present application, there are three third positioning members 26. The third positioning member 26 located in the middle and the third positioning member 26 on the left jointly fix a row of battery cells, and the third positioning member 26 located in the middle and the third positioning member 26 on the right jointly fix a row of battery cells, thus fixing two rows of battery cells in total.

[0059] Optionally, refer to Figure 3 The mounting plate 21 is provided with a weight-reducing hole 211 .

[0060] Specifically, if Figure 3 As shown, since the mounting plate 21 is relatively large in Z and Y dimensions, a weight-reducing hole 211 is provided on the mounting plate 21 to reduce the weight of parts and achieve overall lightweighting of the battery cell liquid injection device.

[0061] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0062] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A battery cell injection device, characterized in that: It comprises a base plate (11), a support column (12), a buffer assembly (13), a snap assembly (14), a cell positioning assembly (2) and a liquid injection assembly (3); One end of the support column (12) is fixed on the base plate (11), and the other end of the support column (12) is connected to the buffer component (13) and the buckle component (14). A limiting protrusion (121) is provided between the two ends of the support column (12). The buckle component (14) is movable to fasten or release the injection component (3). The buffer component (13) abuts against the injection component (3) to provide a vertical upward elastic buffer force. The battery cell positioning assembly (2) is fixed on the bottom plate (11) or fixed on the limiting protrusion (121), and the battery cell positioning assembly (2) is used to fix the battery cell (4).

2. The battery cell liquid injection device according to claim 1, characterized in that: The battery cell positioning assembly (2) comprises a mounting plate (21), a first positioning member (22) and a second positioning member (23); The mounting plate (21) is fixed on the bottom plate (11); the first positioning member (22) and the second positioning member (23) are fixed on the mounting plate (21) and are spaced apart along the length or width direction of the mounting plate (21); the first positioning member (22) is used to support the bottom of the battery cell (4); and the second positioning member (23) is used to fix the middle of the battery cell (4).

3. The battery cell liquid injection device according to claim 1, characterized in that: The battery cell positioning assembly (2) comprises a support plate (25) and a third positioning member (26); The support plate (25) is fixed on the limiting protrusion (121), the third positioning member (26) is fixed on the first surface of the support plate (25), and the third positioning member (26) is used to support the bottom of the battery cell (4).

4. The battery cell liquid injection device according to claim 1, characterized in that: The buffer assembly (13) includes a first mounting column (131), a positioning pin (132) and an elastic member (133); One end of the first mounting column (131) is fixedly connected to the support column (12), and the other end is connected to the positioning pin (132) and the elastic member (133). The positioning pin (132) is locked and connected to the liquid injection assembly (3), and the elastic force direction of the elastic member (133) is vertically upward.

5. The battery cell liquid injection device according to claim 2, characterized in that: The battery cell positioning assembly (2) further includes a connecting piece (24); There are at least two mounting plates (21), the connecting member (24) is connected between the at least two mounting plates (21), and the first positioning members (22) and the second positioning members (23) on the at least two mounting plates (21) are arranged relative to each other.

6. The battery cell liquid injection device according to claim 3, characterized in that: The battery cell positioning assembly (2) further includes a limiting member (27); The limiting member (27) is fixed to the second surface of the support plate (25), and a fastener is provided between the limiting member (27) and the limiting protrusion (121).

7. The battery cell liquid injection device according to claim 1, characterized in that: The buckle assembly (14) includes a second mounting column (141) and a movable part (142); The second mounting column (141) has a mounting groove (1411), and the movable member (142) is arranged in the mounting groove (1411) and is rotatably connected to the second mounting column (141) to be in an expanded or stored state.

8. The battery cell liquid injection device according to claim 5, characterized in that: There are at least three mounting plates (21), and the accommodation space between two adjacent mounting plates (21) is used to fix a row of battery cells (4).

9. The battery cell liquid injection device according to claim 3, characterized in that: There are at least three third positioning members (26), and the accommodation space between two adjacent third positioning members (26) is used to fix a row of battery cells (4).

10. The battery cell liquid injection device according to claim 2, characterized in that: The mounting plate (21) is provided with a weight-reducing hole (211).

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