Liquid injection nozzle, liquid injection nozzle mechanism and liquid injection device

Abstract

The utility model relates to a liquid injection nozzle, a liquid injection nozzle mechanism and a liquid injection device. The liquid injection nozzle mechanism comprises a liquid injection cup and a liquid injection nozzle. A boss is formed in the middle of the end face of the first end of the liquid injection nozzle, and an abutting plane is formed on the end face of the first end of the liquid injection nozzle in the circumferential direction of the boss. During liquid injection, the boss extends into the liquid injection hole in the shell, the abutting plane is attached to the surface of the shell in a sealed mode, and the electrolyte in the liquid injection cup can be injected into the liquid injection hole through the liquid injection channel. The abutting plane is matched with the shell to form sealing between the liquid injection nozzle and the liquid injection hole, and compared with a traditional sealing mode that a conical outer end face is connected with the edge of the liquid injection hole in a pressing mode, the contact area between the abutting plane and the surface of the shell is larger, so that the sealing effect is good, and the service life of the liquid injection nozzle is prolonged. And the sealing effect is not influenced even if the liquid injection nozzle deviates within a certain range relative to the liquid injection hole. In addition, the boss does not affect the sealing effect after being abraded in the liquid injection process. Therefore, the liquid injection nozzle mechanism and the liquid injection device can improve the air tightness during liquid injection.

Description

Technical Field

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

[0002] Liquid filling is a crucial step in lithium battery manufacturing, typically achieved by inserting a filling nozzle into the filling port. Common filling nozzles are conical, with their outer diameter at the base smaller than the diameter of the filling port's recess. This allows the conical outer end face of the nozzle to press against the edge of the recess, achieving a seal. The seal between the nozzle and the recess edge relies on high positioning accuracy, requiring concentric alignment between the nozzle and the filling port. However, due to the small diameter of the nozzle and its susceptibility to wear and deformation over time, concentricity cannot be guaranteed, leading to issues such as substandard airtightness during the filling process. Utility Model Content

[0003] Therefore, it is necessary to provide an injection nozzle, injection nozzle mechanism, and injection device that can improve the airtightness during injection to address the above problems.

[0004] An injection nozzle includes a first end and a second end disposed opposite to each other. A boss is formed in the middle of the end face of the first end of the injection nozzle, and a bearing plane is formed along the circumference of the boss on the end face of the first end of the injection nozzle. An injection channel is formed inside the injection nozzle, and the injection channel extends to the end face of the boss.

[0005] In one embodiment, the injection nozzle is capable of extending into an injection hole on the housing, and the abutting surface is capable of sealingly fitting against the surface of the housing, thereby creating a gap between the end face of the boss and the step of the injection hole.

[0006] In one embodiment, the boss is cylindrical.

[0007] In one embodiment, the boss is concentrically arranged with the injection nozzle.

[0008] In one embodiment, the injection nozzle is capable of elastic deformation.

[0009] A liquid injection nozzle mechanism includes a liquid injection cup and a liquid injection nozzle as described in any of the preferred embodiments above, wherein a second end of the liquid injection nozzle is connected to the liquid injection cup.

[0010] In one embodiment, the injection nozzle mechanism further includes a connector disposed between the injection cup and the injection nozzle, the injection nozzle being detachably mounted on the connector.

[0011] In one embodiment, the end face of the second end of the injection nozzle is formed with a mounting hole, the sidewall of the mounting hole is partially recessed inward to form an annular groove, the connector is formed with a protruding post, the protruding post is formed with an annular protrusion protruding in a radial direction, the protruding post passes through the mounting hole and the annular protrusion is interference-fitted with the annular groove.

[0012] In one embodiment, the end face of the connector is formed with a receiving groove along the circumference of the protrusion, and the second end of the injection nozzle is inserted into the receiving groove.

[0013] In one embodiment, the injection cup is provided with an inlet valve and an outlet valve at both ends, and the injection nozzle is connected to the injection cup through the outlet valve.

[0014] In one embodiment, the injection nozzle is capable of extending into the injection hole of the lithium battery, and the abutment plane is capable of sealing and fitting against the outer casing of the lithium battery, thereby creating a gap between the end face of the boss and the step of the injection hole.

[0015] A liquid injection device includes a liquid injection nozzle mechanism as described in any of the preferred embodiments above.

[0016] In the aforementioned injection nozzle, injection nozzle mechanism, and injection device, during injection, the boss extends into the injection hole on the outer shell, and the supporting plane seals against the surface of the outer shell, allowing the electrolyte in the injection cup to be injected into the injection hole through the injection channel. The cooperation between the supporting plane and the outer shell forms a seal between the injection nozzle and the injection hole. Compared to the traditional sealing method where the outer end face of a cone presses against the edge of the injection hole, the contact area between the supporting plane and the outer shell surface is larger, resulting in a better sealing effect. Furthermore, misalignment of the injection nozzle relative to the injection hole within a certain range does not affect the sealing effect. Additionally, wear of the boss during injection does not affect the sealing effect. Therefore, the aforementioned injection nozzle, injection nozzle mechanism, and injection device can improve airtightness during injection. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the injection nozzle mechanism in one embodiment of the present invention;

[0019] Figure 2 for Figure 1 The shown is a cross-sectional view of the injection nozzle mechanism along AA;

[0020] Figure 3 for Figure 2 The diagram shows the structure of the injection nozzle in the injection nozzle mechanism.

[0021] Figure 4 for Figure 2 An enlarged schematic diagram of part B in the injection nozzle mechanism shown;

[0022] Figure 5 for Figure 4 An enlarged schematic diagram of part C in the injection nozzle mechanism shown. 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 an injection nozzle 120, an injection nozzle mechanism 100, and an injection device (not shown in the figure). The injection device includes an injection nozzle mechanism 100, which can inject electrolyte into a battery 200 in a metered manner. Typically, the injection device needs to inject electrolyte into multiple batteries 200 in one injection operation; therefore, the injection device generally includes multiple injection nozzle mechanisms 100, each capable of injecting electrolyte into one battery 200.

[0030] Please refer to the following: Figure 2 In one embodiment of the present invention, the injection nozzle mechanism 100 includes an injection cup 110 and an injection nozzle 120.

[0031] The electrolyte filling cup 110 is generally a hollow, elongated cylinder used to store electrolyte. The filling nozzle 120 is connected to the filling cup 110, allowing the electrolyte stored in the filling cup 110 to enter the filling nozzle 120 and ultimately be injected into the battery 200. Specifically, in this embodiment, the filling cup 110 is further equipped with an inlet valve 140 and an outlet valve 150 at both ends, with the filling nozzle 120 connected to the filling cup 110 via the outlet valve 150. Both the inlet valve 140 and the outlet valve 150 can be solenoid valves. The inlet valve 140 controls the process of electrolyte entering the filling cup 110, enabling quantitative replenishment of the electrolyte in the filling cup 110; while the outlet valve 150 controls the process of electrolyte injection into the battery 200, achieving quantitative electrolyte injection.

[0032] Please refer to the following: Figure 3 and Figure 4 The injection nozzle 120 has an injection channel 123 formed inside. The injection nozzle 120 includes a first end away from the injection cup 110 and a second end close to the injection cup 110. During injection, the first end of the injection nozzle 120 faces downwards and the second end faces upwards. Furthermore, a boss 121 is formed at the center of the end face of the first end of the injection nozzle 120, and the injection channel 123 extends to the end face of the boss 121.

[0033] The electrolyte filling channel 123 is connected to the electrolyte filling cup 110, specifically indirectly through the electrolyte outlet valve 150. When the electrolyte outlet valve 150 is opened, the electrolyte in the electrolyte filling cup 110 can enter the electrolyte filling channel 123. Specifically, the battery 200 has an electrolyte filling hole 201 on its outer casing (see...). Figure 4 Furthermore, a step extending circumferentially is formed along the outer edge of the injection hole 201. That is to say, the injection hole 201 is divided into two sections, and its overall shape is a stepped hole. When performing the injection operation, the injection nozzle 120 is inserted into the injection hole 201 and a seal is formed between the nozzle and the injection hole 201.

[0034] Furthermore, the end face of the first end of the injection nozzle 120 forms a supporting plane 122 along the circumference of the boss 121. The end face of the first end of the injection nozzle 120 is generally set as a plane, while the boss 121 protrudes from the end face of the first end. When the injection nozzle 120 is inserted into the injection hole 201, the boss 121 extends into the injection hole 201 and the supporting plane 122 is sealed and fitted against the surface of the battery 200 casing, so that the electrolyte in the injection cup 110 can be injected into the injection hole 201 through the injection channel 123. The supporting plane 122 and the casing cooperate to form a seal between the injection nozzle 120 and the injection hole 201.

[0035] Compared to the traditional sealing method where the outer end face of the conical nozzle presses against the edge of the injection hole 201, the contact area between the holding plane 122 and the outer shell surface is larger, resulting in a better sealing effect. Moreover, even if the injection nozzle 120 is offset relative to the injection hole 201 within a certain range, it does not affect the sealing effect. Therefore, the above-mentioned injection nozzle mechanism 100 and injection device can improve the airtightness during injection.

[0036] Specifically, in this embodiment, the boss 121 can be cylindrical and concentrically positioned with the injection nozzle 120. Thus, after the boss 121 is inserted into the injection hole 201, the concentricity between the injection nozzle 120 and the injection hole 201 is relatively high. The contact area between the abutting plane 122 and the outer shell surface is evenly distributed circumferentially along the injection hole 201, thereby further improving the sealing effect between the injection nozzle 120 and the injection hole 201.

[0037] Furthermore, when injecting electrolyte into the battery 200 for secondary electrolyte filling, the residual electrolyte at the injection port 201 usually crystallizes significantly after the first filling and the battery has been stationary. Therefore, it needs to be wiped before the second filling. However, due to the presence of dead corners, conventional wiping operations are insufficient to completely remove the crystals at the root of the steps at the injection port 201.

[0038] To resolve this issue, please refer to the following: Figure 5 In this embodiment, the abutment plane 122 can seal against the surface of the outer shell, and a gap is formed between the end face of the boss 121 and the step of the injection hole 201. Specifically, the height of the end face of the boss 121 relative to the first end of the injection nozzle 120 is controlled so that its height is less than the height of the step of the injection hole 201. Thus, when the boss 121 extends into the injection hole 201, its end face (lower end face) will form a gap with the step of the injection hole 201, i.e. Figure 5 As shown in the diagram, L.

[0039] During the second injection and vacuum positive pressure static cycle, the newly injected electrolyte will overflow from the gap between the boss 121 and the step of the injection hole 201 onto the step of the injection hole 201. Figure 5 The area shown is region a. In this way, the new electrolyte can soak and soften the crystals at the injection port 201. Since the newly injected electrolyte contains DMC or DEC solvent, it can wet and dissolve the crystals formed during the first injection, thereby softening the crystals and facilitating subsequent wiping for effective cleaning.

[0040] Specifically, in this embodiment, the injection nozzle 120 is capable of elastic deformation. The injection nozzle 120 can be made of an elastic material, such as rubber, and has elasticity. Therefore, when the abutting surface 122 of the injection nozzle 120 abuts against the surface of the battery 200 casing, its elastic deformation can effectively fill the gap, thereby improving the sealing effect between the injection nozzle 120 and the injection hole 201.

[0041] Furthermore, in this embodiment, the injection nozzle mechanism 100 also includes a connector 130 disposed between the injection cup 110 and the injection nozzle 120, with the injection nozzle 120 detachably mounted on the connector 130. The injection nozzle 120 is prone to wear after repeated injections, so making it detachable facilitates replacement. Specifically, the connector 130 can be a connecting flange, which is specifically mounted on the outlet valve 150. Moreover, the connector 130 has a channel formed within it for the flow of electrolyte, connecting the injection nozzle 120 and the outlet valve 150.

[0042] Furthermore, in this embodiment, the end face of the second end of the injection nozzle 120 is formed with a mounting hole 124. The sidewall of the mounting hole 124 is partially recessed inward to form an annular groove 1241. The connector 130 is formed with a protrusion 131, and the protrusion 131 is formed with an annular protrusion 1311 protruding radially. The protrusion 131 passes through the mounting hole 124 and the annular protrusion 1311 is press-fitted with the annular groove 1241.

[0043] Because the injection nozzle 120 can undergo elastic deformation, the annular protrusion 1311 can be squeezed through the mounting hole 124 until it is engaged in the annular groove 1241, thereby forming a barb structure between the annular protrusion 1311 and the annular groove 1241, achieving a reliable connection between the injection nozzle 120 and the connector 130. When it is necessary to disassemble the injection nozzle 120, only a large force needs to be applied to pull the injection nozzle 120 out.

[0044] Specifically, the mounting hole 124 is connected to the injection channel 123, and the flow channel in the connector 130 extends to the convex surface of the protrusion 131. After the protrusion 131 is inserted into the mounting hole 124, the flow channel in the connector 130 can be connected to the injection channel 123.

[0045] Furthermore, in this embodiment, a receiving groove (not shown) is formed on the end face of the connector 130 along the circumference of the protrusion 131, and the second end of the injection nozzle 120 is inserted into the receiving groove. The receiving groove is annular and can form an interference fit with the second end of the injection nozzle 120, thereby improving the reliability of the assembly of the injection nozzle 120 and the connector 130. On the other hand, the interference fit between the second end of the injection nozzle 120 and the receiving groove can also improve the sealing performance between the connector 130 and the injection nozzle 120, preventing electrolyte leakage at the junction of the connector 130 and the injection nozzle 120.

[0046] During liquid injection, the aforementioned injection nozzle mechanism 100 and injection device, with the boss 121 extending into the injection hole 201 on the battery 200 casing and the supporting plane 122 sealingly adhering to the surface of the casing, allow the electrolyte in the injection cup 110 to be injected into the injection hole 201 through the injection channel 123. The cooperation between the supporting plane 122 and the casing forms a seal between the injection nozzle 120 and the injection hole 201. Compared to the traditional sealing method where the outer end face of a cone presses against the edge of the injection hole 201, the contact area between the supporting plane 122 and the casing surface is larger, resulting in a better sealing effect. Furthermore, any misalignment of the injection nozzle 120 relative to the injection hole 201 within a certain range does not affect the sealing effect. Additionally, wear of the boss 121 during the injection process does not affect the sealing effect. Therefore, the aforementioned injection nozzle mechanism 100 and injection device can improve airtightness during liquid injection.

[0047] 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.

[0048] 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 nozzle, characterized in that, The device includes a first end and a second end that are arranged opposite to each other. A boss is formed in the middle of the end face of the first end of the injection nozzle, and a bearing plane is formed along the circumference of the boss on the end face of the first end of the injection nozzle. An injection channel is formed inside the injection nozzle, and the injection channel extends to the end face of the boss.

2. The injection nozzle according to claim 1, characterized in that, The injection nozzle can extend into the injection hole on the housing, and the supporting plane can seal against the surface of the housing, forming a gap between the end face of the boss and the step of the injection hole.

3. The injection nozzle according to claim 1, characterized in that, The boss is cylindrical.

4. The injection nozzle according to claim 3, characterized in that, The boss is concentrically arranged with the injection nozzle.

5. The injection nozzle according to claim 1, characterized in that, The injection nozzle is capable of elastic deformation.

6. A liquid injection nozzle mechanism, characterized in that, It includes an injection cup and an injection nozzle as described in any one of claims 1 to 5, wherein the second end of the injection nozzle is connected to the injection cup.

7. The injection nozzle mechanism according to claim 6, characterized in that, The injection nozzle mechanism also includes a connector disposed between the injection cup and the injection nozzle, and the injection nozzle is detachably installed on the connector.

8. The injection nozzle mechanism according to claim 7, characterized in that, The end face of the second end of the injection nozzle is formed with a mounting hole. The side wall of the mounting hole is partially recessed inward to form an annular groove. The connector is formed with a protruding post. The protruding post is formed with an annular protrusion that protrudes radially. The protruding post passes through the mounting hole and the annular protrusion and the annular groove are interference-fitted.

9. The injection nozzle mechanism according to claim 8, characterized in that, The end face of the connector has a receiving groove formed along the circumference of the protrusion, and the second end of the injection nozzle is inserted into the receiving groove.

10. The injection nozzle mechanism according to claim 6, characterized in that, The injection cup is provided with an inlet valve and an outlet valve at both ends, and the injection nozzle is connected to the injection cup through the outlet valve.

11. The injection nozzle mechanism according to any one of claims 6 to 10, characterized in that, The injection nozzle can extend into the injection hole of the lithium battery, and the supporting surface can seal and fit against the outer casing of the lithium battery, forming a gap between the end face of the boss and the step of the injection hole.

12. A liquid injection device, characterized in that, Includes the injection nozzle mechanism as described in any one of claims 6 to 11 above.

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