Liquid injection nozzle

Abstract

The utility model discloses a liquid injection nozzle, and relates to the technical field of battery liquid injection, the liquid injection nozzle comprises a shell assembly, the shell assembly comprises a shell and an electrolyte circulation channel penetrating through the shell; and the acting assembly comprises a plurality of liquid blocking strips arranged on the inner wall of the electrolyte circulation channel at intervals, the liquid blocking strips are arranged in the length direction of the electrolyte circulation channel, and a flexible liquid injection opening is formed in the liquid outlet end of the electrolyte circulation channel. The electrolyte circulating channel is formed in the shell, the multiple liquid blocking strips are arranged on the inner wall of the electrolyte circulating channel at intervals, the phenomenon that the electrolyte is hung on the wall is reduced, the electrolyte injection precision is improved, and the flexible electrolyte injection opening can improve the connection precision and the connection sealing performance between the electrolyte injection nozzle and the battery electrolyte injection opening.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid injection, in particular to a liquid injection nozzle. Background Art

[0002] Battery liquid injection needles are key tools used to inject electrolyte into batteries during the manufacturing process. They are widely used in the battery manufacturing industry, particularly in the production of lithium batteries, where precise control of the amount of electrolyte injected is required. Battery liquid injection needles typically consist of a needle body and an infusion tube. The needle body is internally provided with an infusion channel connecting the liquid outlet and liquid inlet.

[0003] When filling the battery, electrolyte often sticks to the wall. The electrolyte sticking to the wall causes the actual amount of electrolyte injected into the battery to be less than the preset amount, thereby affecting the filling accuracy. Insufficient filling volume will affect the electrochemical performance of the battery, such as capacity, cycle life and other issues. At the same time, when filling, if the battery position shifts too much, the filling nozzle will not be able to completely cover the battery filling hole, and the electrolyte will not be able to saturate into the battery, resulting in poor filling, leakage, and in severe cases, bloating, depression, valve burst and other serious consequences. Utility Model Content

[0004] The present application provides a liquid filling nozzle, which can solve the technical problems in the prior art where the amount of electrolyte actually injected into the battery is less than the preset amount due to the electrolyte sticking to the wall, thereby affecting the injection accuracy. At the same time, excessive battery position deviation will cause the liquid filling nozzle to fail to completely cover the battery filling hole, and the electrolyte and static pressure cannot enter the battery interior to saturation.

[0005] The embodiment of the present application provides a liquid injection nozzle, comprising:

[0006] A housing assembly, the housing assembly comprising a housing and an electrolyte flow channel passing through the housing;

[0007] The active component includes a plurality of liquid blocking bars spaced apart on the inner wall of the electrolyte circulation channel, the liquid blocking bars are arranged along the length direction of the electrolyte circulation channel, and a flexible liquid injection port is provided at the liquid outlet end of the electrolyte circulation channel.

[0008] In one embodiment, the electrolyte circulation channel is located at the center of the shell and is arranged along the axial direction of the shell.

[0009] In one embodiment, the electrolyte circulation channel includes, from top to bottom, a first circulation channel and a second circulation channel that is coaxially arranged with the first circulation channel and has a larger diameter than the first circulation channel.

[0010] In one embodiment, a slope surface inclined toward the second circulation channel is provided at a connection between the first circulation channel and the second circulation channel.

[0011] In one embodiment, the top end of the first circulation channel forms a connection port for being sleeved on the periphery of the battery liquid injection needle, and the bottom end of the second circulation channel forms the liquid outlet end of the electrolyte circulation channel and is connected to the flexible injection port.

[0012] In one embodiment, a plurality of the liquid-blocking strips are protruding from the inner wall surface of the second circulation channel and are equidistantly arranged around the inner wall surface of the second circulation channel.

[0013] In one embodiment, the liquid-blocking strip extends toward the central axis of the second flow channel.

[0014] In one embodiment, the liquid blocking strip includes a first wall surface disposed toward the central axis of the second flow channel, and two second walls connected to the first wall surface, wherein the first wall surface is a curved surface.

[0015] In one embodiment, the distance from the first wall to the central axis of the second circulation channel is equal to the radius of the first circulation channel.

[0016] In one embodiment, the outer diameter of the flexible liquid injection port gradually decreases in a direction away from the shell.

[0017] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0018] 1. The liquid injection nozzle in the present application is provided with an electrolyte flow channel on the shell, and multiple liquid blocking strips are provided at intervals on the inner wall of the electrolyte flow channel. This can reduce the phenomenon of electrolyte sticking to the wall through structural linkage, thereby improving the accuracy of electrolyte injection. By providing a flexible liquid injection port at the liquid outlet end of the electrolyte flow channel, the accuracy and sealing of the connection between the liquid injection nozzle in the present application and the battery liquid injection port can be improved, thereby ensuring the normal operation of the liquid injection work.

[0019] 2. The liquid injection nozzle in this application can be used to be directly sleeved on the outer periphery of the battery liquid injection needle, which facilitates the installation and replacement of the liquid injection nozzle in this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A schematic diagram of the structure of a liquid injection nozzle provided in an embodiment of the present application;

[0022] Figure 2 A front view of a liquid injection nozzle provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the electrolyte flow channel structure of a liquid injection nozzle provided in an embodiment of the present application;

[0024] In the figure: 1. Shell; 2. Electrolyte flow channel; 201. First flow channel; 202. Second flow channel; 203. Sloped surface; 3. Liquid barrier strip; 4. Flexible liquid injection port. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] An embodiment of the present application provides a filling nozzle, which can solve the technical problems in the prior art that during the electrolyte filling process, the electrolyte in the filling nozzle adheres to the wall, resulting in the actual amount of electrolyte injected into the battery being less than the preset amount, thereby affecting the filling accuracy. At the same time, when the battery position is offset too much, the filling nozzle cannot completely cover the battery filling hole, and the electrolyte cannot enter the battery saturatedly.

[0027] The injection nozzle in this application includes a shell component and an active component. The shell component is used to be directly mounted on the outer periphery of the electrolyte injection needle for easy direct replacement. The active component is arranged inside the shell component to prevent the electrolyte from adhering to the wall and to improve the accuracy and sealing of the docking between the injection nozzle and the battery injection port.

[0028] Specifically, Figure 1 This is a schematic diagram of a liquid injection nozzle structure provided in an embodiment of the present application. Figure 2 A front view of a liquid injection nozzle provided in an embodiment of the present application, as shown Figure 1 、 Figure 2As shown, the shell assembly of the injection nozzle in the present application includes a shell 1 and an electrolyte circulation channel 2 that passes through the shell 1. During the actual assembly process, the inner diameter of the electrolyte circulation channel 2 is larger than the outer diameter of the electrolyte injection needle. The electrolyte injection needle and the injection nozzle in the present application are fitted together to improve the convenience of installing and replacing the injection needle nozzle. As an optional embodiment, in the present application, the difference between the inner diameter of the electrolyte circulation channel 2 and the outer diameter of the injection needle nozzle is preferably 0.3MM. Taking the outer diameter of the commonly used electrolyte injection needle of 3MM as an example, in the present application, the inner diameter of the electrolyte circulation channel 2 is set to 3.3MM. The injection nozzle in the present application is connected to the electrolyte injection needle and the electrolyte circulation channel 2 is connected from top to bottom. The electrolyte flowing out of the electrolyte injection needle is injected into the battery after passing through the electrolyte circulation channel 2.

[0029] Furthermore, the functional component of the liquid injection nozzle in the present application includes a plurality of liquid blocking bars 3 spaced apart on the inner wall of the electrolyte circulation channel 2. The liquid blocking bars 3 are arranged along the length direction of the electrolyte circulation channel 2. A flexible liquid injection port 4 is provided at the liquid outlet end of the electrolyte circulation channel 2.

[0030] The liquid barrier strips 3 are fixedly connected to the inner wall of the electrolyte circulation channel 2 and are spaced apart. The multiple liquid barrier strips 3 spaced apart can change the geometric shape of the inner wall of the electrolyte circulation channel 2, effectively control the fusion behavior of the electrolyte, and guide the electrolyte to flow along the expected path, effectively reducing the occurrence of wall hanging. At the same time, the flexible liquid injection port 4 is made of a flexible material as a whole and has a certain elasticity. When the electrolyte injection needle drives the shell 1 to squeeze the battery liquid injection port, the flexible liquid injection port 4 can be deformed to compensate for the position deviation between the electrolyte injection needle and the battery liquid injection port, thereby improving the sealing between the flexible liquid injection port 4 and the battery liquid injection port.

[0031] Furthermore, the electrolyte circulation channel 2 is located at the center of the shell 1 and the electrolyte circulation channel 2 is arranged along the axial direction of the shell 1. The electrolyte circulation channel 2 longitudinally passes through the center position of the shell 1 to ensure the uniformity of the reserved width on both sides of the shell 1 and ensure that the injection work is carried out normally.

[0032] Further, Figure 3 This is a schematic diagram of the structure of the electrolyte flow channel 2 of the liquid injection nozzle provided in the embodiment of the present application, as shown in FIG. Figure 3As shown, the electrolyte circulation channel 2 includes, from top to bottom, a first circulation channel 201 and a second circulation channel 202 coaxially arranged with the first circulation channel 201 and having a larger diameter than the first circulation channel 201. The top of the first circulation channel 201 forms a connection port for being sleeved on the periphery of the electrolyte injection needle. In actual use, the first circulation channel 201 is used to be sleeved on the periphery of the electrolyte injection needle. The electrolyte flowing out of the electrolyte injection needle directly enters the second circulation channel 202. The bottom end of the second circulation channel 202 forms the liquid outlet end of the electrolyte circulation channel 2 and is connected to the flexible liquid injection port 4. To ensure the sealing of the liquid injection operation, the top of the flexible liquid injection port 4 is fixedly connected to the liquid outlet end of the electrolyte circulation channel 2 to form a whole. The electrolyte flowing out of the liquid outlet end of the second circulation channel 202 directly enters the battery through the flexible liquid injection port 4.

[0033] Furthermore, a slope surface 203 inclined toward the second circulation channel 202 is provided at the connection between the first circulation channel 201 and the second circulation channel 202. The slope surface 203 connects the bottom of the first circulation channel 201 and the top of the second circulation channel 202. The slope of the slope surface 203 can ensure the normal sliding of the electrolyte and prevent the electrolyte from hanging on the wall.

[0034] Furthermore, a plurality of liquid barrier strips 3 are provided protruding from the inner wall surface of the second circulation channel 202 and are equidistantly arranged around the inner wall surface of the second circulation channel 202. In one embodiment of the present application, the length of the liquid barrier strip 3 is consistent with the height of the second circulation channel 202. In combination with the above description, the top of the liquid barrier strip 3 is also configured to have a slope shape consistent with the shape of the slope surface 203, and is connected to the slope surface 203 to form a whole. The liquid barrier strips 3 are arranged at intervals. A portion of the electrolyte flowing out of the first circulation channel 201 flows through the slope surface 203 between two adjacent liquid barrier strips 3 to the inner wall of the second circulation channel 202, and finally flows into the flexible liquid injection port 4, and a portion flows directly into the flexible liquid injection port 4 from the inner surface of the liquid barrier strip 3.

[0035] Furthermore, the liquid blocking bars 3 are mainly provided to prevent the phenomenon of wall sticking. Therefore, equidistant arrangement of the plurality of liquid blocking bars 3 can ensure that the electrolyte is uniformly disturbed during the flow process, which is more conducive to reducing the phenomenon of wall sticking.

[0036] Furthermore, the liquid barrier strip 3 extends toward the central axis of the second circulation channel 202. The liquid barrier strip 3 includes a first wall surface arranged toward the central axis of the second circulation channel 202, and two second walls connected to the first wall surface. The first wall surface is an arc surface, and the distance from the first wall surface to the central axis of the second circulation channel 202 is equal to the radius of the first circulation channel 201.

[0037] Specifically, the side of the liquid-retaining strip 3 facing the first wall is connected to the inner wall of the second flow channel 202 and forms an integral part with the second flow channel 202. The first wall of the liquid-retaining strip 3 extends toward the central axis of the second flow channel 202, and its curvature matches the curvature of the inner wall of the first flow channel 201. The second walls are positioned on opposite sides of the first wall, with one of the second walls of two adjacent liquid-retaining strips 3 approaching each other. Multiple liquid-retaining strips 3 are arranged along the inner wall of the second flow channel 202. This can be understood as the first walls of the multiple liquid-retaining strips 3 connected to form an inner circle. This inner circle is coaxial with the first flow channel 201 and has the same diameter, ensuring smooth electrolyte flow. The inner diameter of the first flow channel 201 and the diameter of the inner circle formed by the connected first walls are determined based on actual liquid injection requirements and are not specifically limited in this application.

[0038] Furthermore, the outer diameter of the flexible liquid injection port 4 gradually decreases in the direction away from the shell 1. During the liquid injection operation, the liquid inlet of the flexible liquid injection port 4 is connected to the liquid outlet end of the electrolyte circulation channel 2, and the liquid outlet of the flexible liquid injection port 4 is connected to the battery liquid injection port, and the outer diameter of the liquid inlet of the flexible liquid injection port 4 is larger than the outer diameter of the liquid outlet of the flexible liquid injection port 4, so that when the battery position deviates, the smaller liquid outlet of the flexible liquid injection port 4 can accurately enter the battery liquid injection port.

[0039] Furthermore, in order to prevent the injection nozzle in the present application from being damaged by excessive squeezing during the injection process, causing the injection channel to be blocked, the axial length of the first circulation channel 201 in the present application is less than the length of the electrolyte injection needle mounting section. As an optional embodiment, the difference between the axial length of the first circulation channel 201 and the length of the electrolyte injection needle is preferably 0.5 mm. Taking the length of the electrolyte injection needle mounting section as 5 mm as an example, the axial length of the first circulation channel 201 is 4.5 mm. Based on this setting, after the shell 1 is installed, a certain distance is left between the top of the shell 1 and the top of the electrolyte injection needle mounting section. When the shell 1 is over-squeezed, the shell 1 can be displaced a certain distance upward along the electrolyte injection needle to reduce the pressure on the shell 1.

[0040] The injection nozzle in the present application is provided with an electrolyte circulation channel 2 on the shell 1, and the injection channel is divided into a first circulation channel 201 and a second circulation channel 202 with a diameter larger than the first circulation channel 201. The first circulation channel 201 can be used to be sleeved on the outer periphery of the electrolyte injection needle, which is convenient for the installation and replacement of the injection nozzle in the present application. By arranging a plurality of liquid blocking strips 3 at intervals on the inner wall of the second circulation channel 202, the structural linkage effect can be used to reduce the electrolyte wall adhesion phenomenon and improve the injection accuracy of the electrolyte. By arranging a flexible injection port 4 with a decreasing outer diameter at the liquid outlet end of the electrolyte circulation channel 2, the accuracy and sealing of the connection between the injection nozzle and the battery injection port in the present application can be improved, thereby ensuring the normal operation of the injection work.

[0041] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0043] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A liquid injection nozzle, characterized in that: include: A housing assembly, the housing assembly comprising a housing (1) and an electrolyte flow channel (2) passing through the housing (1); An active component comprises a plurality of liquid blocking bars (3) spaced apart on the inner wall of the electrolyte circulation channel (2), the liquid blocking bars (3) being arranged along the length direction of the electrolyte circulation channel (2), and a flexible liquid injection port (4) being provided at the liquid outlet end of the electrolyte circulation channel (2).

2. The liquid injection nozzle according to claim 1, wherein The electrolyte circulation channel (2) is located at the center of the shell (1) and is arranged along the axial direction of the shell (1).

3. The liquid injection nozzle according to claim 1, wherein The electrolyte circulation channel (2) comprises, from top to bottom, a first circulation channel (201) and a second circulation channel (202) coaxially arranged with the first circulation channel (201) and having a diameter larger than that of the first circulation channel (201).

4. The liquid injection nozzle according to claim 3, wherein A slope surface (203) inclined toward the second circulation channel (202) is provided at the connection between the first circulation channel (201) and the second circulation channel (202).

5. The liquid injection nozzle according to claim 3, wherein The top end of the first circulation channel (201) forms a connection port for being sleeved on the periphery of the injection needle, and the bottom end of the second circulation channel (202) forms the liquid outlet end of the electrolyte circulation channel (2) and is connected to the flexible injection port (4).

6. The liquid injection nozzle according to claim 3, wherein A plurality of liquid blocking strips (3) are arranged protruding from the inner wall surface of the second circulation channel (202) and are arranged at equal intervals around the inner wall surface of the second circulation channel (202).

7. The liquid injection nozzle according to claim 6, wherein The liquid blocking strip (3) extends toward the central axis of the second circulation channel (202).

8. The liquid injection nozzle according to claim 7, wherein: The liquid blocking strip (3) comprises a first wall surface arranged toward the central axis of the second circulation channel (202), and two second wall surfaces connected to the first wall surface, wherein the first wall surface is a curved surface.

9. The liquid injection nozzle according to claim 8, wherein The distance from the first wall surface to the central axis of the second circulation channel (202) is equal to the radius of the first circulation channel (201).

10. The liquid injection nozzle according to claim 1, wherein The outer diameter of the flexible liquid injection port (4) gradually decreases in a direction away from the housing (1).

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