Liquid injection device and battery production system

Abstract

The utility model discloses a liquid injection device and a battery production system. The liquid injection device comprises a liquid injection mechanism, the liquid injection mechanism comprises a liquid injection cavity and a liquid injection cup, the interior of the liquid injection cavity is suitable for arranging a battery shell, the liquid injection cup is suitable for containing electrolyte, the liquid injection cup is connected to the liquid injection cavity, the liquid injection cup is provided with a liquid outlet, and the liquid outlet is communicated with the liquid injection cavity and is opposite to the battery shell; the liquid pushing mechanism comprises a first rod body and a second rod body, the second rod body is movably arranged in the first rod body, the first rod body can move in the liquid injection cup so as to push the electrolyte in the liquid injection cup into the liquid injection cavity from the liquid outlet, and the second rod body can move relative to the first rod body and can block or open the liquid outlet; the second rod body can intermittently block or open the liquid outlet, so that liquid can be injected into the battery shell for multiple times, the speed of infiltrating the interior of the battery shell by the electrolyte is increased, the battery production efficiency is improved, and the electrolyte is uniformly infiltrated in the battery shell, so that the performance of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production equipment technical field more specifically, relate to a kind of injection device and battery production system. BACKGROUND

[0002] In the related art, electrolyte is injected into the battery through the injection device from the injection hole of the battery during production. The current injection device generally includes an injection cavity and an injection cup. The battery is placed in the injection cavity. The electrolyte is first injected into the injection cup, and then the electrolyte in the injection cup is injected into the battery shell through the injection cup corresponding to the injection cavity. Then, the electrolyte slowly infiltrates the inside of the battery shell by vacuumizing and pressurizing the injection cavity. The injection method takes a long time, has low production efficiency, and the electrolyte is not evenly infiltrated in the battery shell, which affects the performance of the battery.

[0003] Therefore, there is a need to provide a new technical solution to solve the above technical problems. SUMMARY

[0004] An object of the utility model is to provide a new technical solution for an injection device.

[0005] According to the first aspect of the utility model, an injection device is provided. The injection device includes:

[0006] An injection mechanism includes an injection cavity and an injection cup. The inside of the injection cavity is suitable for setting a battery shell. The injection cup is suitable for containing electrolyte. The injection cup is connected to the injection cavity. The injection cup is provided with a liquid outlet. The liquid outlet is communicated with the injection cavity and opposite to the battery shell.

[0007] A liquid pushing mechanism includes a first rod and a second rod. The second rod is movably arranged in the first rod. The first rod can move in the injection cup to push the electrolyte in the injection cup from the liquid outlet into the injection cavity. The second rod can move relative to the first rod and can block or open the liquid outlet.

[0008] Optionally, the injection cup includes a cup body and an injection pipe. The first end of the injection pipe is arranged in the bottom of the cup body. The second end of the injection pipe extends into the injection cavity. The second rod can block or open the first end.

[0009] Optionally, the first rod is provided with a first sealing member around the outer periphery. The first sealing member can abut against the inner wall of the cup body.

[0010] Optionally, an outer wall of the liquid injection pipe is provided with a connecting piece, one end of the connecting piece is connected with a bottom wall of the cup body, and the other end of the connecting piece, which is away from the cup body, is connected with the liquid injection cavity.

[0011] Optionally, a second sealing piece is arranged between the first rod body and the second rod body.

[0012] Optionally, the liquid pushing mechanism further comprises a first mounting piece, the second rod body is elastically connected to the first mounting piece, and the first mounting piece can drive the second rod body to move towards or away from the liquid outlet.

[0013] Optionally, the liquid injection cavity comprises a tray and a shell, the tray is capable of being sealingly arranged at an open end of the shell, the tray is suitable for carrying the battery shell, and the liquid injection cup is connected to the shell.

[0014] Optionally, a first driving piece is further included, the first driving piece can drive the shell to move in a first direction, so that the shell is separated from or connected to the tray.

[0015] Optionally, a second driving piece is further included, the second driving piece is suitable for driving the tray to move in a second direction.

[0016] According to the second aspect of the utility model, a battery production system is provided. The battery production system comprises the liquid injection device in the above embodiments.

[0017] One technical effect of the present application is that the liquid injection cup is used for containing electrolyte, the first rod body can be inserted into the liquid injection cup and can move in the liquid injection cup, so as to push the electrolyte in the liquid injection cup into the liquid injection cavity from the liquid outlet, thereby realizing liquid injection on the battery shell, the second rod body can move relative to the first rod body, so as to intermittently block or open the liquid outlet, thereby realizing liquid injection on the battery shell in multiple times, which is beneficial to improving the speed of electrolyte infiltrating the inside of the battery shell, improving the battery production efficiency, and uniformly infiltrating the electrolyte in the inside of the battery shell, so as to ensure the performance of the battery.

[0018] Other features and advantages of the utility model will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

[0020] Figure 1 is a structure schematic view of the liquid injection device of one embodiment of the present application.

[0021] Figure 2is Figure 1 the enlarged view at A is shown.

[0022] Figure 3 is a schematic view of a partial structure of a liquid injection mechanism and a liquid pushing mechanism according to an embodiment of the present application.

[0023] Figure 4 is a schematic view of a partial structure of a liquid injection mechanism and a liquid pushing mechanism according to another embodiment of the present application.

[0024] Figure 5 is a schematic view of a partial structure of a liquid injection mechanism according to an embodiment of the present application.

[0025] Reference Signs:

[0026] 1, liquid injection mechanism; 11, liquid injection cavity; 111, tray; 112, shell; 12, liquid injection cup; 121, liquid outlet; 122, cup body; 123, liquid injection pipe; 1231, connecting piece; 13, first sealing member; 14, second sealing member; 15, third sealing member; 16, fourth sealing member; 2, liquid pushing mechanism; 21, first rod body; 22, second rod body; 24, first mounting member; 25, elastic member; 26, second mounting member; 3, first driving member; 4, third driving member; 5, battery shell; 6, base. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. If it is considered that the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application unless otherwise specified.

[0028] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the present application, its application, or uses.

[0029] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as part of the description of the present application.

[0030] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values.

[0031] It should be noted that like reference numerals and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0032] According to an embodiment of the present application, a liquid injection device is provided. As shown in FIG. 1, the liquid injection device includes a liquid injection mechanism 1 and a liquid pushing mechanism 2. Figures 1 to 5As shown, the liquid injection device includes a liquid injection mechanism 1 and a liquid pushing mechanism 2. The liquid injection mechanism 1 includes a liquid injection cavity 11 and a liquid injection cup 12. The liquid injection cavity 11 is adapted to accommodate the battery shell 5. The liquid injection cup 12 is adapted to contain electrolyte. The liquid injection cup 12 is connected to the liquid injection cavity 11. The liquid injection cup 12 is provided with a liquid outlet 121. The liquid outlet 121 is connected to the liquid injection cavity 11 and opposite to the battery shell 5. The liquid pushing mechanism 2 includes a first rod 21 and a second rod 22. The second rod 22 is movably arranged in the first rod 21. The first rod 21 is movable in the liquid injection cup 12 to push the electrolyte in the liquid injection cup 12 into the liquid injection cavity 11 through the liquid outlet 121. The second rod 22 is movable relative to the first rod 21 to block or open the liquid outlet 121.

[0033] In this example, the liquid injection cup 12 is used to contain electrolyte. The first rod 21 is capable of extending into the liquid injection cup 12 and movable in the liquid injection cup 12 to push the electrolyte in the liquid injection cup 12 into the liquid injection cavity 11 through the liquid outlet 121 to realize liquid injection of the battery shell 5. The second rod 22 is movable relative to the first rod 21 to intermittently block or open the liquid outlet 121 to realize multi-time liquid injection of the battery shell 5. This is beneficial to improve the speed of electrolyte soaking into the battery shell 5, improve the battery production efficiency, and ensure the uniform soaking of electrolyte into the battery shell 5 to ensure the performance of the battery.

[0034] As shown, Figures 3 to 5 In this example, a certain amount of electrolyte is added to the liquid injection cup 12 through the liquid injection needle. Then the first rod is capable of extending into the liquid injection cup 12 and moving downward to press the electrolyte to flow into the liquid injection cavity 11 through the liquid outlet 121. Then the second rod 22 is movable toward the liquid outlet 121 to block the liquid outlet 121 to realize the sealing of the liquid injection cavity 11. Then the liquid injection cavity 11 is subjected to multiple positive pressure and negative pressure operations to realize the uniform soaking of electrolyte into the battery shell 5. Then the second rod 22 is moved away from the liquid outlet 121 to open the liquid outlet 121. Under the action of negative pressure, the electrolyte is capable of flowing from the liquid outlet 121 to the liquid injection cavity 11. Through multiple cycles of operation, the electrolyte in the liquid injection cup 12 is capable of being uniformly soaked into the battery shell 5. Since the amount of electrolyte injected each time is small, the soaking is more sufficient each time, which is beneficial to improve the performance of the battery.

[0035] In this example, multiple battery casings 5 can be arranged in the liquid injection cavity 11 at the same time, for example, in an array. Multiple liquid injection cups 12 are provided, and the multiple liquid injection cups 12 are distributed in the liquid injection cavity 11, and each liquid injection cup 12 is provided with a corresponding liquid pushing mechanism 2.

[0036] In one example, as shown in Figure 4 and Figure 5 , the liquid injection cup 12 includes a cup body 122 and a liquid injection pipe 123, the first end of the liquid injection pipe 123 is arranged in the bottom of the cup body 122, the second end of the liquid injection pipe 123 extends into the liquid injection cavity 11, and the second rod body 22 can block or open the first end.

[0037] As shown in Figure 4 and Figure 5 , in this example, the injection needle can first inject a certain amount of electrolyte into the inner cavity of the cup body 122, the liquid injection pipe 123 includes opposite first and second ends, the first end can be arranged in the bottom of the cup body 122 and extend into the inner cavity of the cup body 122. The opening of the first end can be the liquid outlet 121, and the second rod body 22 can block or open the first end, that is, the second rod body 22 can block or open the liquid outlet 121. The second end can extend into the liquid injection cavity 11, and the second end has an opening, and the electrolyte in the cup body 122 can flow from the first end into the liquid injection pipe 123 and from the second end into the battery casing 5.

[0038] In this example, the first end of the liquid injection pipe 123 can be arranged in the bottom of the cup body 122 and extend into the inner cavity of the cup body 122, the injection needle can first inject a certain amount of electrolyte into the inner cavity of the cup body 122, and the liquid level of the electrolyte can be lower than the liquid outlet 121. The first rod body 21 is hollow, and the second rod body 22 is movably arranged in the first rod body 21. The first rod body 21 extends into the cup body 122 and presses down the electrolyte, and the first rod body 21 can be sleeved on the outside of part of the liquid injection pipe 123, and the electrolyte can flow from the gap between the first rod body 21 and the liquid injection pipe 123 into the liquid outlet 121.

[0039] In this example, as shown in Figures 3 to 5 , the outer periphery of the first rod body 21 is sleeved with a first sealing member 13, and the first sealing member 13 can abut against the inner wall of the cup body 122. When the first rod body 21 extends into the inner cavity of the cup body 122, the outer circle of the first sealing member 13 can abut against the inner wall of the cup body 122, thereby achieving a sealing effect to prevent the electrolyte from flowing out from the gap between the first rod body 21 and the inner wall of the cup body 122 when the first rod body 21 is pressed down.

[0040] In this example, the outer wall of the first rod body 21 is provided with a limiting groove in the circumferential direction, and the first sealing member 13 can be a flexible sealing ring, and the first sealing member 13 is arranged in the limiting groove. The first sealing member 13 can be made of silicone or rubber, etc. The skilled in the art can determine according to the actual situation, which is not specifically limited here.

[0041] In one example, as shown in Figure 3 , the first rod body 21 and the second rod body 22 are provided with a second sealing member 14.

[0042] As shown in Figure 3 , the second rod body 22 is externally sleeved with the second sealing member 14, and the outer ring of the second sealing member 14 can abut against the inner wall of the first rod body 21 to play a sealing role, that is, when the first rod body 21 is pressed down, it is beneficial to make the electrolyte in the cup body 122 be pressed into the liquid injection pipe 123 by positive pressure, which can avoid the electrolyte entering the inside of the first rod body 21.

[0043] In this example, the outer wall of the second rod body 22 is provided with a limiting groove in the circumferential direction, and the second sealing member 14 can be a flexible sealing ring, and the second sealing member 14 is arranged in the limiting groove. The second sealing member 14 can be a flexible sealing ring, for example, the second sealing member 14 can be made of silicone or rubber, etc. The skilled in the art can determine according to the actual situation, which is not specifically limited here.

[0044] In this example, the cup body 122 can be a cylindrical structure, the first rod body 21 can be a hollow cylindrical rod, and the second rod body 22 can also be a cylindrical rod. Of course, the specific shape of the cup body 122, the first rod body 21 and the second rod body 22 can be determined by the skilled in the art according to the actual situation, which is not specifically limited here.

[0045] In one example, as shown in Figure 5 , the outer wall of the liquid injection pipe 123 is provided with a connecting piece 1231, one end of the connecting piece 1231 is connected with the bottom wall of the cup body 122, and the other end of the connecting piece 1231 away from the cup body 122 is connected with the liquid injection cavity 11.

[0046] As shown in Figure 5As shown, in this example, the outer wall of the liquid injection pipe 123 is integrally formed with a protrusion, which is arranged along the circumference of the liquid injection pipe 123 to form a connecting piece 1231. One end of the connecting piece 1231 is connected to the bottom wall of the cup body 122. The bottom wall of the cup body 122 is provided with a through hole for avoiding the liquid injection pipe 123, i.e., the first end of the liquid injection pipe 123 can pass through the through hole and extend into the inner cavity of the cup body 122. A fourth sealing piece 16 is further arranged between the connecting piece 1231 and the cup body 122, and the fourth sealing piece 16 is arranged on the outer periphery of the through hole, one end of the fourth sealing piece 16 abuts against the connecting piece 1231, and the other end abuts against the bottom wall of the cup body 122, so as to seal the through hole. The fourth sealing piece 16 can be a flexible sealing ring, and the through hole is located on the inner side of the flexible sealing ring. For example, the fourth sealing piece 16 can be made of silicone or rubber, etc. The skilled in the art can determine according to the actual situation, which is not specifically limited here.

[0047] In this example, the end of the connecting piece 1231 away from the cup body 122 is connected to the outer shell 112 of the liquid injection cavity 11. The outer shell 112 is provided with a through hole for avoiding the liquid injection pipe 123, i.e., the second end of the liquid injection pipe 123 can pass through the through hole and extend into the liquid injection cavity 11 to inject electrolyte into the inside of the battery shell 5. The outer side of the liquid injection pipe 123 is further sleeved with a third sealing piece 15, the outer wall of the liquid injection pipe 123 is provided with a limiting groove, the third sealing piece 15 is arranged in the limiting groove, and the outer ring of the third sealing piece 15 can abut against the inner wall of the through hole on the outer shell 112 to seal, so as to facilitate the pressurization and negative pressure operation of the inside of the liquid injection cavity 11. The third sealing piece 15 can be a flexible sealing ring. For example, the third sealing piece 15 can be made of silicone or rubber, etc. The skilled in the art can determine according to the actual situation, which is not specifically limited here.

[0048] The third sealing piece 15 can be arranged in multiple along the length direction of the through hole to further improve the sealing effect. For example, the third sealing piece 15 can be arranged in two or three, etc. The skilled in the art can determine according to the actual situation, which is not specifically limited here.

[0049] In one example, as shown in Figure 1 and Figure 2 The liquid injection mechanism 2 further includes a first mounting piece 24, and the second rod body 22 is elastically connected to the first mounting piece 24, and the first mounting piece 24 can drive the second rod body 22 to move towards or away from the liquid outlet 121. By elastically connecting the second rod body 22 to the first mounting piece 24, when the first mounting piece 24 drives the second rod body 22 to move towards the liquid outlet 121 and abut against the liquid injection pipe 123, a buffering effect can be achieved to avoid damaging the liquid injection pipe 123 or the second rod body 22.

[0050] As shown in Figure 1 andFigure 2 As shown, in this example, the liquid pushing mechanism 2 further comprises a second mounting member 26, which is located at one side of the first mounting member 24, the first rod body 21 is connected to the second mounting member 26, and the second mounting member 26 can drive the first rod body 21 to move towards or away from the cup body 122. One end of the first rod body 21 can be provided with a through hole, and the first rod body 21 passes through the second mounting member 26 and is then connected to the first mounting member 24. The elastic member 25 (for example, a spring) is sleeved on the portion of the second rod body 22 between the first mounting member 24 and the second mounting member 26. One end of the elastic member 25 can be connected to the first mounting member 24, and the other end can be connected to the second mounting member 26. After the second mounting member 26 drives the first rod body 21 to press the part of the electrolyte into the battery shell 5, the second mounting member 26 is fixed, and then the first mounting member 24 can drive the second rod body 22 to move towards the liquid outlet 121, and the elastic member 25 can be compressed by a certain amount, thereby being able to play a certain buffering effect.

[0051] Alternatively, the second rod body 22 can be arranged to be able to slide a certain distance relative to the first mounting member 24, and the elastic member 25 is sleeved on the second rod body 22, one end of the elastic member 25 is connected to the first mounting member 24, and the other end is connected to the first rod body 21. Of course, the specific connection structure of the second rod body 22 and the first mounting member 24 can be determined by the person skilled in the art according to the actual situation, which is not limited here.

[0052] In this example, the first mounting member 24 and the second mounting member 26 can be mounting plate structures, and the first rod body 21 and the second rod body 22 are provided in multiple groups, and the multiple groups of the first rod body 21 and the second rod body 22 can be arrayed on the mounting plate.

[0053] In this example, the liquid injection device further comprises a base 6 and a third driving member 4, the first mounting member 24 can be slidably connected to the base 6 through a sliding rail, and the third driving member 4 is installed on the base 6. The third driving member 4 can drive the first mounting member 24 to move, thereby driving the second rod body 22 to move. The third driving member 4 can be a driving mechanism such as a pneumatic cylinder or an electric cylinder. The second mounting member 26 can be slidably connected to the base 6 through a sliding rail, and the second mounting member 26 can also be driven by a driving member such as a pneumatic cylinder or an electric cylinder to move, thereby driving the first rod body 21 to move.

[0054] In one example, the liquid injection cavity 11 comprises a tray 111 and a shell 112, the tray 111 can be sealingly arranged at the open end of the shell 112, the tray 111 is suitable for carrying the battery shell 5, and the liquid injection cup 12 is connected to the shell 112.

[0055] In this example, the shell 112 has an open end, and the tray 111 can correspond to the open end, i.e. the battery shell 5 is placed on the tray 111. The shell 112 is driven to move towards the tray 111, so that the tray 111 can seal the open end of the shell 112. The liquid injection cup 12 is arranged on the side of the shell 112 opposite to the open end, and the upper end of the liquid injection cup 12 is provided with a liquid injection pipe 123 for injecting a certain amount of electrolyte into the cup body 122. By integrating the liquid injection cup 12 with the shell 112, the liquid injection cup 12 can be avoided from being transferred from other stations to the shell 112, which is beneficial to save the operation process.

[0056] In one example, as shown in Figure 1 The liquid injection device further comprises a first driving member 3, which can drive the shell 112 to move in a first direction, so that the shell 112 is separated from or connected to the tray 111.

[0057] As shown in Figure 1 In this example, the shell 112 can be connected to the base 6 through a sliding rail and can move in a first direction, for example, the first direction can be a vertical direction. The first driving member 3 can drive the shell 112 to move upwards to separate from the tray 111. The first driving member 3 can also drive the shell 112 to move downwards, so that the tray 111 can cover the open end of the shell 112.

[0058] The first driving member 3 can be a driving mechanism such as a pneumatic cylinder or an electric cylinder, and multiple first driving members 3 can be arranged to improve the stability and reliability of driving the shell 112 to move. For example, two or three first driving members 3 can be arranged. Of course, the specific arrangement of the first driving member 3 can be determined by those skilled in the art according to the actual situation, which is not limited here.

[0059] In one example, the liquid injection device further comprises a second driving member, which is suitable for driving the tray 111 to move in a second direction.

[0060] In this example, the tray 111 is loaded at a loading position, for example, the battery shell 5 is placed on the tray 111 by a mechanical hand. Then the second driving member drives the tray 111 to move in a second direction to the lower side of the shell 112, for example, the second direction can be a horizontal direction. Then the first driving member 3 drives the shell 112 to move downwards, so that the tray 111 can cover the open end of the shell 112, and then the liquid injection operation of the battery shell 5 is performed.

[0061] The second driving member can be a transfer mechanism such as a conveyor belt or a mechanical hand. The specific arrangement of the second driving member can be determined by those skilled in the art according to the actual situation, which is not limited here.

[0062] According to another embodiment of the utility model, a battery production system is provided. The battery production system comprises the liquid injection device of the above embodiment. The liquid injection device comprises a liquid injection mechanism 1 and a liquid pushing mechanism 2. The liquid injection mechanism 1 comprises a liquid injection cavity 11 and a liquid injection cup 12, the inside of the liquid injection cavity 11 is suitable for arranging a battery shell 5, the liquid injection cup 12 is connected to the liquid injection cavity 11, the liquid injection cup 12 is provided with a liquid outlet 121, the liquid outlet 121 is communicated with the liquid injection cavity 11 and opposite to the battery shell 5. The liquid pushing mechanism 2 comprises a first rod body 21 and a second rod body 22, the second rod body 22 is movably arranged in the first rod body 21, the first rod body 21 can move in the liquid injection cup 12 to push the electrolyte in the liquid injection cup 12 into the liquid injection cavity 11 from the liquid outlet 121, the second rod body 22 can move relative to the first rod body 21 and can block or open the liquid outlet 121. The liquid injection cup 12 is used for containing electrolyte, the first rod body 21 can press the electrolyte in the liquid injection cup 12 into the liquid injection cavity 11 from the liquid outlet 121, so that the battery shell 5 is injected, the second rod body 22 can intermittently block or open the liquid outlet 121, so that the battery shell 5 can be injected for multiple times, which is beneficial to improve the speed of electrolyte infiltrating the inside of the battery shell 5, improve the battery production efficiency, and the electrolyte is uniformly infiltrated in the inside of the battery shell 5 to ensure the performance of the battery.

[0063] In this example, the un-injected battery shell can be loaded on the tray by an automatic device such as an industrial robot, and after the injection device completes the injection of the battery, the battery shell after injection is transported to the next station, thereby realizing the full automation of the battery production process.

[0064] The above embodiment focuses on the differences between the embodiments, and the different optimization features between the embodiments can be combined to form a better embodiment without contradiction. Considering the brevity of the text, it will not be repeated here.

[0065] Although some specific embodiments of the utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims

1. A liquid injection device characterized by comprising: The application relates to a liquid injection device. The liquid injection device comprises a liquid injection mechanism (1) and a liquid pushing mechanism (2). The liquid injection mechanism (1) comprises a liquid injection cavity (11) and a liquid injection cup (12), the inside of the liquid injection cavity (11) is suitable for arranging a battery shell (5), the liquid injection cup (12) is suitable for containing electrolyte, the liquid injection cup (12) is connected to the liquid injection cavity (11), the liquid injection cup (12) is provided with a liquid outlet (121), the liquid outlet (121) is communicated with the liquid injection cavity (11) and opposite to the battery shell (5).

2. The liquid injection apparatus according to claim 1, wherein The liquid pushing mechanism (2) comprises a first rod body (21) and a second rod body (22), the second rod body (22) is movably arranged in the first rod body (21), the first rod body (21) can move in the liquid injection cup (12) to push the electrolyte in the liquid injection cup (12) into the liquid injection cavity (11) from the liquid outlet (121), the second rod body (22) can move relative to the first rod body (21) and can block or open the liquid outlet (121).

3. The liquid injection device according to claim 2, wherein The liquid injection cup (12) comprises a cup body (122) and a liquid injection pipe (123), the first end of the liquid injection pipe (123) penetrates the bottom of the cup body (122), the second end of the liquid injection pipe (123) extends into the liquid injection cavity (11), and the second rod body (22) can block or open the first end.

4. The liquid injection apparatus according to claim 2, wherein The outer periphery of the first rod body (21) is sleeved with a first sealing piece (13), and the first sealing piece (13) can abut against the inner wall of the cup body (122).

5. The liquid injection apparatus according to claim 1, wherein The outer wall of the liquid injection pipe (123) is provided with a connecting piece (1231), one end of the connecting piece (1231) is connected with the bottom wall of the cup body (122), and the other end of the connecting piece (1231) away from the cup body (122) is connected with the liquid injection cavity (11).

6. The liquid injection apparatus according to claim 1, wherein A second sealing piece (14) is arranged between the first rod body (21) and the second rod body (22).

7. The liquid injection apparatus according to claim 1, wherein The liquid pushing mechanism (2) further comprises a first mounting piece (24), the second rod body (22) is elastically connected to the first mounting piece (24), and the first mounting piece (24) can drive the second rod body (22) to move towards or away from the liquid outlet (121).

8. The liquid injection device according to claim 7, wherein The liquid injection cavity (11) comprises a tray (111) and a shell (112), the tray (111) can be sealingly arranged at the opening end of the shell (112), the tray (111) is suitable for bearing the battery shell (5), and the liquid injection cup (12) is connected to the shell (112).

9. The liquid injection apparatus according to claim 7, wherein The liquid injection device further comprises a first driving piece (3), the first driving piece (3) can drive the shell (112) to move along a first direction so that the shell (112) is separated from or connected to the tray (111).

10. A battery production system, characterized by, The liquid injection device further comprises a second driving piece, the second driving piece is suitable for driving the tray (111) to move along a second direction. The liquid injection device comprises the liquid injection device as claimed in any one of claims 1 to 9.

Images