Liquid injection device and liquid injection equipment

Abstract

The utility model relates to a liquid injection device and liquid injection equipment, the liquid injection device comprises a liquid injection cup and a liquid injection needle, and electrolyte is injected into the liquid injection cup in advance. The liquid injection needles are arranged in the corresponding liquid injection cups in a penetrating mode, and the liquid injection cups can move along the liquid injection needles. During liquid injection, a battery is fed to the liquid injection tray, the liquid injection tray drives the battery to the position below the liquid injection device, and a liquid outlet of the liquid injection needle is aligned with a liquid injection hole of the battery through positioning. Then, the liquid injection cup is driven to move along the liquid injection needle until the liquid inlet of the liquid injection needle is located below the liquid level of the electrolyte, and the electrolyte can enter the liquid injection needle and is finally injected into the battery through the liquid outlet. The liquid injection amount of the electrolyte can be accurately controlled through the moving distance of the liquid injection cup, and once the liquid level of the electrolyte is lower than the liquid inlet, the electrolyte cannot enter the liquid injection needle. Therefore, only the movement distance of the liquid injection cup needs to be controlled, and the liquid injection device and the liquid injection equipment can simplify the structure on the premise of accurately controlling the liquid injection amount.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery equipment technology, and in particular to a liquid injection device and liquid injection equipment. Background Technology

[0002] Electrolyte injection is a crucial step in lithium battery production, requiring a precise amount of electrolyte to be injected into the casing and wet the battery cell. Currently, common injection devices first inject electrolyte into an injection cup, then use a piston rod to force the electrolyte from the cup into the casing. To accurately control the injection volume, the piston rod's stroke must be precisely controlled, necessitating a corresponding control module for each piston rod. Furthermore, due to factors such as gravity and inertia, leakage may still occur after the piston stops moving, requiring further control of the injection process. This results in a relatively complex structure for the injection device. Utility Model Content

[0003] Therefore, it is necessary to provide a simple injection device and equipment that can achieve precise control of the injection volume to address the above problems.

[0004] A liquid injection device includes a liquid injection cup and a liquid injection needle corresponding to the liquid injection cup; the liquid injection needle passes through the corresponding liquid injection cup, and the liquid injection cup is movable along the liquid injection needle; the liquid inlet of the liquid injection needle is located inside the liquid injection cup, and the liquid outlet of the liquid injection needle extends out from the bottom of the liquid injection cup.

[0005] In one embodiment, the system further includes a first mounting plate and a second mounting plate, the second mounting plate being slidably mounted on the first mounting plate, the injection cup being mounted on the second mounting plate, and the injection needle being mounted on the first mounting plate.

[0006] In one embodiment, multiple injection cups and injection needles are provided, and the multiple injection needles and multiple injection cups are arranged in an array on the first mounting plate and the second mounting plate, respectively.

[0007] In one embodiment, the second mounting plate has a plurality of receiving holes, and each of the injection cups is inserted into the receiving hole.

[0008] In one embodiment, the surface of the first mounting plate is provided with a plurality of guide rods, and the second mounting plate is slidably sleeved on the guide rods.

[0009] In one embodiment, a strip-shaped through-channel is formed at the bottom of the injection cup, through which the injection needle passes.

[0010] In one embodiment, a sealing ring is provided on the inner wall of the through channel, and the injection needle abuts against the sealing ring.

[0011] In one embodiment, the injection needle is a hollow structure with openings at both ends, and the inlet and outlet are located on the two end faces of the injection needle, respectively.

[0012] In one embodiment, the outer diameter of the injection needle near the outlet gradually decreases in the direction pointing towards the outlet.

[0013] A liquid injection device includes a liquid injection tray and a liquid injection apparatus as described in any of the above embodiments.

[0014] In the aforementioned electrolyte injection device and equipment, the electrolyte cup is pre-filled with electrolyte. During injection, the battery is first loaded onto the electrolyte injection tray, which then moves the battery to the bottom of the injection device. Positioning is used to align the outlet of the injection needle with the battery's injection hole. Next, the electrolyte cup is moved along the injection needle until the inlet of the injection needle is below the electrolyte level. The electrolyte then enters the injection needle and is ultimately injected into the battery through the outlet. The amount of electrolyte injected can be precisely controlled by the moving distance of the electrolyte cup. If the electrolyte level is below the inlet, the electrolyte will not be able to enter the injection needle. Therefore, only the moving distance of the electrolyte cup needs to be controlled, thus simplifying the structure of the aforementioned electrolyte injection device and equipment while achieving precise control of the injection volume. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial structural schematic diagram of the liquid injection device in one embodiment of the present invention;

[0017] Figure 2 for Figure 1 Front view of the injection equipment shown;

[0018] Figure 3 for Figure 2 The shown liquid injection device is a cross-sectional view along AA.

[0019] Figure 4 for Figure 1 A schematic diagram showing the coordination of a single injection cup and injection needle in one state in the injection device shown;

[0020] Figure 5 for Figure 4 The diagram shows a cross-sectional view of a single injection cup and injection needle along BB.

[0021] Figure 6 for Figure 1 A schematic diagram showing the coordination of a single injection cup and injection needle in another state of the injection device shown;

[0022] Figure 7 for Figure 6 The diagram shows a cross-sectional view of a single injection cup and injection needle along the CC direction. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] Please see Figure 1 This utility model provides a liquid injection device 10 and a liquid injection apparatus 100. The liquid injection device 10 includes a liquid injection apparatus 100 and a liquid injection tray 200.

[0030] The injection tray 200 can support the cup 30 containing the battery 20, which can be a cylindrical battery. After supporting the cup 30, the injection tray 200 can be moved under the injection device 100, whereby the injection device 100 completes the injection of electrolyte into the battery 20. The edge of the injection tray 200 is generally also equipped with a latch (not shown in the figure) to lock it with the injection device 100, thereby ensuring that the injection tray 200 will not shake relative to the injection device 100 during the injection process.

[0031] Please refer to the following: Figure 2 and Figure 3 In one embodiment of the present invention, the liquid injection device 100 includes an injection cup 110 and an injection needle 120.

[0032] The injection cup 110 has a cavity for containing electrolyte. An injection needle 120 is correspondingly positioned within the injection cup 110, and passes through the corresponding injection cup 110. The injection needle 120 is elongated, and its extension direction is consistent with the extension direction of the injection cup 110. In actual use, the injection needle 120 extends vertically.

[0033] The injection needle 120 remains in a fixed position during the injection process to ensure alignment with the injection port of the battery 20, while the injection cup 110 can move along the injection needle 120. Figure 5 and Figure 7 As shown, the injection needle 120 has an inlet 121 and an outlet. The inlet 121 is located inside the injection cup 110, and the outlet 122 of the injection needle 120 extends from the bottom of the injection cup 110. Before injection, the inlet 121 of the injection needle 120 is above the surface of the electrolyte in the injection cup 110, preventing the electrolyte in the injection cup 110 from entering the injection needle 120 (see...). Figure 5 By moving the injection needle 120, the liquid level of the electrolyte in the injection cup 110 can be raised or lowered relative to the inlet 121.

[0034] During electrolyte injection, the outlet 122 of the injection needle 120 is aligned with the injection hole of the battery 20 by positioning. Then, the injection cup 110 is driven to move (upwards) along the injection needle 120, causing the electrolyte level to rise relative to the injection needle 120 until the inlet 121 of the injection needle 120 is below the electrolyte level (see...). Figure 7 At this point, the electrolyte can enter the injection needle 120 through the inlet 121 and finally be injected into the battery through the outlet 122. The amount of electrolyte injected can be precisely controlled by the moving distance of the injection cup 110. If the electrolyte level is lower than the inlet 121, the electrolyte will not be able to enter the injection needle 120. Therefore, precise control of the injection amount can be achieved simply by controlling the moving distance of the injection cup 110.

[0035] Furthermore, the process of electrolyte entering the injection needle 120 is relatively slow, and the moving distance of the injection cup 110 can be repeatedly adjusted before the injection is completed. In other words, the injection cup 110 does not need to be moved into place in one go, so the accuracy requirement for distance control is not high. Therefore, the above-mentioned injection device 100 does not need to be equipped with a complex control module, thereby simplifying the structure while achieving precise control of the injection volume.

[0036] Multiple electrolyte injections can be achieved by controlling the lifting and lowering of the injection cup 110. After the injection is completed, the injection tray 200 can be placed into the high-voltage chamber, and by pressurizing the high-voltage chamber, the electrolyte can be quickly soaked into the cell of the battery 20.

[0037] Multiple injection cups 110 and injection needles 120 are typically provided, and they are arranged in a one-to-one correspondence. Multiple batteries 20 can be loaded onto the injection tray 200 at a time, with the injection cups 110 and injection needles 120 corresponding to the batteries on the injection tray 200. Therefore, the injection device 100 can inject multiple batteries 20 at a time, thereby improving injection efficiency.

[0038] Please refer to it again. Figures 1 to 3 In this embodiment, the injection device 100 further includes a first mounting plate 130 and a second mounting plate 140. The second mounting plate 140 is slidably mounted on the first mounting plate 130, the injection cup 110 is mounted on the second mounting plate 140, and the injection needle 120 is mounted on the first mounting plate 130.

[0039] The first mounting plate 130 and the second mounting plate 140 provide ample installation space for the injection needle 120 and the injection cup 110, facilitating the smooth installation of multiple injection cups 110 and injection needles 120. Specifically, the multiple injection needles 120 and injection cups 110 are arranged in an array on the first mounting plate 130 and the second mounting plate 140, respectively. The injection needle 120 generally penetrates the first mounting plate 130 along its thickness direction, and its outlet 122 is located on the side of the first mounting plate 130 facing away from the second mounting plate 140.

[0040] The first mounting plate 130 remains fixed in position during use. By driving the second mounting plate 140 to slide relative to the first mounting plate 130, multiple injection cups 110 can be slid along their corresponding injection needles 120, thereby simultaneously injecting liquid into multiple batteries 20. Specifically, the second mounting plate 140 can be driven by a cylinder. Moreover, since the injection cups 110 are fixed in position on the second mounting plate 140, the movement distance of multiple injection cups 110 can be controlled simply by controlling the movement distance of the second mounting plate 140, making operation more convenient.

[0041] Specifically, in this embodiment, the second mounting plate 140 has a plurality of receiving holes 141, and each injection cup 110 is inserted into the receiving hole 141. The receiving hole 141 can limit the position of the injection cup 110, thereby ensuring the stability of the position of the injection cup 110.

[0042] Furthermore, in this embodiment, the surface of the first mounting plate 130 is provided with a plurality of guide rods 131, and the second mounting plate 140 is slidably sleeved on the guide rods 131. The guide rods 131 can limit and guide the second mounting plate 140, thereby improving the stability of the second mounting plate 140 when sliding relative to the first mounting plate 130. In this way, the stability of the injection cup 110 when sliding along the corresponding injection needle 120 can be improved, thereby helping to improve the injection accuracy.

[0043] Specifically, a linear bearing can be installed on the second mounting plate 140, and the linear bearing cooperates with the guide rod 131 to enable the second mounting plate 140 to be slidably installed. For the first mounting plate 130, which is roughly rectangular, there are generally four guide rods 131, which are distributed at the four apex corners of the first mounting plate 130.

[0044] Furthermore, in this embodiment, the tops of two adjacent guide rods 131 are connected by a connecting rod 132. After connection, the connecting rod 132 forms an integral frame with the two adjacent guide rods 131, which helps improve the stability of the guide rods 131, reduces their swaying, and further enhances the stability of the second mounting plate 140 when sliding relative to the first mounting plate 130. In addition, the connecting rod 132 also limits the movement of the second mounting plate 140, preventing the injection cup 110 from moving excessively along the injection needle 120 and causing separation, thereby preventing electrolyte leakage from the injection cup 110.

[0045] The injection needle 120 passes through the injection cup 110 and forms a seal between the injection cup 110 and the injection cup 110, thereby preventing the electrolyte in the injection cup 110 from leaking along the gap between the two.

[0046] Please refer to the following: Figures 4 to 7 In this embodiment, a strip-shaped through channel (not shown) is formed at the bottom of the injection cup 110, through which the injection needle 120 passes.

[0047] The through-channel extends axially along the injection cup 110, consistent with the extension direction of the injection needle 120, which passes through the injection cup 110 via this through-channel. The strip-shaped through-channel increases the contact area between the injection needle 120 and the injection cup 110, thereby improving the sealing effect between them. Moreover, the through-channel, in conjunction with the injection needle 120, also guides the injection cup 110, further enhancing the stability of the injection cup 110 as it slides along the corresponding injection needle 120.

[0048] Furthermore, in this embodiment, a sealing ring 150 is provided on the inner wall of the through channel, and the injection needle 120 abuts against the sealing ring 150. An annular groove may be provided on the inner wall of the through channel to accommodate the sealing ring 150. When the injection needle 120 passes through the through channel, it can deform the sealing ring 150 by compression, thereby further improving the sealing performance between the injection needle 120 and the injection cup 110. Only one sealing ring 150 may be provided, or multiple sealing rings may be provided at intervals along the extension direction of the through channel.

[0049] Furthermore, in this embodiment, the injection needle 120 is a hollow structure with openings at both ends, with the inlet 121 and outlet 122 located on the two end faces of the injection needle 120, respectively. Positioning the inlet 121 on the end face of the injection needle 120 facilitates observation of the height difference between the electrolyte level in the injection cup 110 and the inlet 121, thereby enabling precise control of the injection volume. Positioning the outlet 122 on the end face of the injection needle 120 ensures that the electrolyte flows vertically downwards from the outlet 122, thus guaranteeing that the electrolyte is smoothly injected into the injection hole of the battery 20 without being sprayed out laterally.

[0050] Of course, in other embodiments, the inlet 121 and the outlet 122 may also be located on the side of the injection needle 120.

[0051] Furthermore, the outer diameter of the injection needle 120 near the outlet 122 gradually decreases in the direction pointing towards the outlet 122. The end of the injection needle 120 near the outlet 122 is the end that mates with the injection hole of the battery 20. Since its outer diameter gradually decreases in the direction pointing towards the outlet 122, it is roughly conical, which facilitates insertion into the injection hole.

[0052] The electrolyte is pre-filled into the injection cup 110 in the aforementioned injection device 100 and injection equipment 10. During injection, the battery 20 is first loaded onto the injection tray 200, which then moves the battery 20 below the injection device 100. Positioning is used to align the outlet 122 of the injection needle 120 with the injection hole of the battery 20. Next, the injection cup 110 is moved along the injection needle 120 until the inlet 121 of the injection needle 120 is below the electrolyte level. The electrolyte then enters the injection needle 120 and is finally injected into the battery 20 through the outlet 122. The amount of electrolyte injected can be precisely controlled by the moving distance of the injection cup 110. If the electrolyte level is lower than the inlet 121, the electrolyte will not be able to enter the injection needle 120. Therefore, only the moving distance of the injection cup 110 needs to be controlled, so the above-mentioned injection device 100 and injection equipment 10 can simplify the structure while achieving precise control of the injection volume.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A liquid injection device, characterized in that, It includes an injection cup and an injection needle corresponding to the injection cup; the injection needle passes through the corresponding injection cup, and the injection cup can move along the injection needle; the inlet of the injection needle is located inside the injection cup, and the outlet of the injection needle extends from the bottom of the injection cup.

2. The liquid injection device according to claim 1, characterized in that, It also includes a first mounting plate and a second mounting plate, the second mounting plate being slidably mounted on the first mounting plate, the injection cup being mounted on the second mounting plate, and the injection needle being mounted on the first mounting plate.

3. The liquid injection device according to claim 2, characterized in that, Multiple injection cups and injection needles are provided, and the multiple injection needles and multiple injection cups are arranged in an array on the first mounting plate and the second mounting plate, respectively.

4. The liquid injection device according to claim 3, characterized in that, The second mounting plate has a plurality of receiving holes, and each of the liquid injection cups is inserted into the receiving hole.

5. The liquid injection device according to claim 2, characterized in that, The surface of the first mounting plate is provided with a plurality of guide rods, and the second mounting plate is slidably sleeved on the guide rods.

6. The liquid injection device according to claim 1, characterized in that, The bottom of the injection cup has a strip-shaped through channel through which the injection needle passes.

7. The liquid injection device according to claim 6, characterized in that, A sealing ring is provided on the inner wall of the through channel, and the injection needle abuts against the sealing ring.

8. The liquid injection device according to claim 1, characterized in that, The injection needle is a hollow structure with openings at both ends, and the inlet and outlet are located on the two end faces of the injection needle, respectively.

9. The liquid injection device according to claim 8, characterized in that, The outer diameter of the injection needle near the outlet gradually decreases in the direction pointing towards the outlet.

10. A liquid injection device, characterized in that, It includes a liquid injection tray and a liquid injection device as described in any one of claims 1 to 9 above.

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