A reinforced injection needle mechanism

Abstract

This utility model discloses a reinforced injection needle mechanism, belonging to the field of battery electrolyte injection production technology. The reinforced injection needle mechanism includes an injection cylinder with a rotating structure, and an injection needle tube fixedly connected to the outlet end of the injection cylinder. Its key feature is that it further includes a reinforcing structure fixedly connected to the injection cylinder at one end. The reinforcing structure is arranged around the circumference of the injection needle tube, and the length of the reinforcing structure is less than the length of the injection needle tube. This utility model, by forming a ring of reinforcing structure on the injection needle tube, on the one hand, maintains the standard length of the injection needle tube inserted into the injection hole, preventing air bubbles or electrolyte backflow; on the other hand, it prevents the injection needle tube from colliding with the injection hole during the alignment process, thus preventing deformation of the injection needle tube.

Description

Technical Field

[0001] This utility model relates to the field of battery electrolyte injection production technology, and in particular to a reinforced electrolyte injection needle mechanism. Background Technology

[0002] Electrolyte injection is a core process in battery production that determines cell performance. Through high-precision needle design, vacuum-pressure control, and environmental management, it is ensured that the electrolyte in the produced battery can penetrate evenly and form a stable ion conduction system. As a conventional square battery, its injection hole diameter is 1-3mm, while the injection hole of cylindrical batteries is even finer. Therefore, the requirements for the length, strength, and sealing performance of the injection needle are also higher.

[0003] In existing technologies, injection needles are mostly cylindrical in design. The outer ring at the bottom of the needle needs to be inserted into the electrolyte injection port of the battery cell for injection. The hollow center is necessary to ensure the fluidity of the electrolyte. Due to the limitation of the injection port diameter, the wall thickness of the needle is very thin, which makes the needle prone to uneven stress and bending deformation. Usually, after deformation, a new injection needle can only be replaced and its mechanical position recalibrated. This process is time-consuming and labor-intensive. In order to improve strength, the needle port diameter is also reduced to ensure needle strength. However, under the same injection speed and injection volume, this method sacrifices the injection speed and increases the injection time. Therefore, we propose a reinforced injection needle mechanism. Utility Model Content

[0004] The purpose of this invention is to solve the problem of easy deformation of injection needles in the prior art, which leads to increased working time, and to propose a reinforced injection needle mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A reinforced injection needle mechanism includes an injection cylinder with a rotating structure, and an injection needle tube is fixedly connected to the liquid outlet end of the injection cylinder. The mechanism is characterized by further including a reinforcing structure fixedly connected to the injection cylinder at one end, the reinforcing structure being arranged around the circumferential surface of the injection needle tube, and the length of the reinforcing structure being less than the length of the injection needle tube.

[0007] To enhance the strength support for the injection needle, preferably, the ratio of the projected length of the reinforcing structure to that of the injection needle in the same plane is 2-3.5:1.

[0008] To enhance support strength, preferably, the projection shape of the reinforcing structure on the plane is rectangular.

[0009] Furthermore, the ratio of the width of the rectangle to the diameter of the injection needle is 1.2-2.5:1.

[0010] Furthermore, the reinforcing structure includes a cylinder or cuboid, and the axis of the injection needle tube coincides with the center line of the cylinder or cuboid.

[0011] To enhance strength while facilitating further stability of the injection needle, preferably, the reinforcing structure is projected in a trapezoidal shape on a plane, with the lower base of the trapezoid connected to the injection cylinder and the upper base of the trapezoid coupled to the circumferential surface of the injection needle.

[0012] Furthermore, the reinforcing structure includes a frustum or pyramid, and the axis of the injection needle tube coincides with the centerline of the frustum or pyramid.

[0013] To ensure the strength of the injection needle while facilitating its identification, the reinforcing structure preferably includes ribs, with multiple sets of ribs arranged circumferentially and equidistantly on the injection needle.

[0014] Furthermore, the rib plate is rectangular or triangular in shape.

[0015] Preferably, the injection cylinder has a storage cavity and a flow guiding cavity, a limiting annular groove is provided between the storage cavity and the flow guiding cavity, and the injection needle tube is connected to the flow guiding cavity.

[0016] Compared with the prior art, this utility model provides a reinforced injection needle mechanism, which has the following beneficial effects:

[0017] 1. This reinforced injection needle mechanism is designed with a projection length ratio of 2-3.5:1 between the reinforced structure and the injection needle tube on the same plane, which ensures both the strength of the injection needle tube and the stability of the injection speed.

[0018] 2. This reinforced injection needle mechanism is designed with a rectangular shape, such as a cylinder or cuboid, in the planar projection of the reinforced structure. Although this sacrifices the flexibility of the injection needle tube, it further enhances the strength of the injection needle tube.

[0019] 3. This reinforced injection needle mechanism is designed with a trapezoidal shape, such as a frustum or pyramid, in the planar projection of the reinforced structure. This ensures both the strength and flexibility of the injection needle tube. When the injection needle tube is inserted into the injection hole, it can provide a certain auxiliary positioning effect, thereby improving the stability of the injection needle tube during the injection process.

[0020] All parts of the device not mentioned herein are the same as or can be implemented using existing technologies. This utility model forms a reinforcing structure on the injection needle tube. On the one hand, it maintains the standard length of the injection needle tube inserted into the injection hole and prevents air bubbles from remaining or electrolyte from spraying back. On the other hand, it prevents the injection needle tube from colliding with the injection hole during the process of aligning the injection needle tube with the injection hole, which would cause the injection needle tube to deform. Attached Figure Description

[0021] Figure 1 This is a perspective view of a reinforced injection needle mechanism proposed in this utility model;

[0022] Figure 2 This is a cross-sectional view of a reinforced injection needle mechanism proposed in this utility model;

[0023] Figure 3 The main view of the enhanced injection needle mechanism proposed in this utility model Figure 1 ;

[0024] Figure 4 The main view of the enhanced injection needle mechanism proposed in this utility model Figure 2 ;

[0025] Figure 5 A bottom view of the reinforced injection needle mechanism proposed in this utility model. Figure 1 ;

[0026] Figure 6 A bottom view of the reinforced injection needle mechanism proposed in this utility model. Figure 2 ;

[0027] Figure 7 A bottom view of the reinforced injection needle mechanism proposed in this utility model. Figure 3 .

[0028] In the diagram: 1. Injection cylinder; 2. Mounting platform; 3. Reinforcing structure; 4. Injection needle tube; 5. Storage chamber; 6. Limiting ring groove; 7. Guide chamber. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] During battery production, an injection needle is used to inject electrolyte and other substances into the battery cell. This injection is typically performed by an automated robotic arm equipped with an injection needle. The injection needle mainly consists of a rotating base injection cylinder 1 and an integrally formed mounting platform 2 for the injection end, along with an injection needle tube 4. The injection cylinder 1 primarily serves as a connector to the automated liquid supply equipment. The injection cylinder 1 needs to be fixed to the automated liquid supply equipment. It has a cylindrical storage cavity 5 and a conical guide cavity 7 inside. A limiting annular groove 6 is formed between the storage cavity 5 and the guide cavity 7. The supply pipe of the automated liquid supply equipment extends into the storage cavity 5 through a connector and fits against it, engaging with the limiting annular groove 6 to fix the injection cylinder 1 in place. When liquid injection is needed, the automated liquid supply equipment controls the injection cylinder 1 to move to the battery's injection hole, inserting the injection needle tube 4 into the injection hole. The liquid is then fed through the conical guide cavity 7 into the injection needle tube 4 and injected into the battery cell.

[0032] Example 1:

[0033] Reference Figures 1-7 To improve the stability and deformation resistance of the injection needle tube 4 during the alignment process with the injection hole, a reinforced injection needle mechanism is proposed. This mechanism includes a reinforcing structure 3 fixedly connected to one end of the injection cylinder 1. The reinforcing structure 3 surrounds the circumference of the injection needle tube 4. Without changing the inner diameter of the injection needle tube 4, the length of the reinforcing structure 3 is less than the length of the injection needle tube 4. On the one hand, this maintains the standard length of the injection needle tube 4 inserted into the injection hole, preventing air bubbles or electrolyte backflow. On the other hand, it prevents the injection needle tube 4 from impacting the injection hole during the alignment process, thus preventing deformation of the injection needle tube 4.

[0034] Specifically, the ratio of the projected lengths of the reinforcing structure 3 and the injection needle tube 4 on the same plane is 2-3.5:1. In this application, the preferred length ratio is 2:1, which ensures both the strength of the injection needle tube 4 and the stability of the injection speed.

[0035] Example 2:

[0036] Reference Figures 1-3 and Figures 5-7 Based on Example 1, the projection shape of the reinforcing structure 3 on the plane is designed to be rectangular, such as a cylinder or cuboid. When this shape is selected, the axis of the injection needle tube 4 coincides with the center line of the cylinder or cuboid. Although the flexibility of the injection needle tube 4 is sacrificed, the strength of the injection needle tube 4 is further improved.

[0037] Here, the ratio of the width of the rectangular projection to the diameter of the injection needle tube 4 is 1.2-2.5:1, and is preferably 1.8:1 in this application, so as to maintain the effective strength and impact number of the injection needle tube 4 in rapid alignment or low-precision automated liquid supply robot arm control, and ensure that the injection needle tube 4 can be used for a long time.

[0038] Example 3:

[0039] Reference Figures 4-7 Based on Embodiment 1, the reinforced structure 3 is designed with a trapezoidal projection shape on the plane. The lower base of the long side of the trapezoid is connected to the injection cylinder 1, and the upper base of the short side of the trapezoid is coupled to the circumferential surface of the injection needle tube 4. Its three-dimensional structure is like a frustum or a pyramid. The axis of the injection needle tube 4 coincides with the center line of the frustum or pyramid. This structure not only ensures the strength of the injection needle tube 4, but also improves the flexibility of the injection needle tube 4. When the injection needle tube 4 is inserted into the injection hole, it can play a certain auxiliary positioning effect, thereby improving the stability of the injection needle tube 4 during the injection process.

[0040] Example 4:

[0041] Reference Figures 4-7 Based on Embodiments 2 and 3, the reinforcing structure 3 is designed to consist of 3-6 ribs. Multiple ribs are arranged equidistantly in a circle on the injection needle tube 4 to reduce the weight of the entire injection needle. The ribs are designed to be rectangular or triangular to improve the support strength of the injection needle tube 4.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reinforced injection needle mechanism, comprising an injection cylinder (1) with a rotating structure, wherein an injection needle tube (4) is fixedly connected to the outlet end of the injection cylinder (1), characterized in that, It also includes a reinforcing structure (3) that is fixedly connected to the injection cylinder (1) at one end. The reinforcing structure (3) is arranged around the circumference of the injection needle tube (4), and the length of the reinforcing structure (3) is less than the length of the injection needle tube (4).

2. The reinforced injection needle mechanism according to claim 1, characterized in that, The ratio of the projected lengths of the reinforcing structure (3) and the injection needle (4) on the same plane is 2-3.5:

1.

3. The reinforced injection needle mechanism according to claim 1, characterized in that, The projection shape of the reinforcing structure (3) on the plane is rectangular.

4. The reinforced injection needle mechanism according to claim 3, characterized in that, The ratio of the width of the rectangle to the diameter of the injection needle (4) is 1.2-2.5:

1.

5. A reinforced injection needle mechanism according to claim 3 or 4, characterized in that, The reinforcing structure (3) includes a cylinder or cuboid, and the axis of the injection needle (4) coincides with the center line of the cylinder or cuboid.

6. The reinforced injection needle mechanism according to claim 1, characterized in that, The reinforced structure (3) is projected into a trapezoidal shape on the plane, and the lower base of the trapezoid is connected to the injection cylinder (1), while the upper base of the trapezoid is coupled to the circumferential surface of the injection needle tube (4).

7. The reinforced injection needle mechanism according to claim 6, characterized in that, The reinforcing structure (3) includes a frustum or pyramid, and the axis of the injection needle (4) coincides with the center line of the frustum or pyramid.

8. A reinforced injection needle mechanism according to claim 3 or 6, characterized in that, The reinforcing structure (3) also includes ribs, and multiple sets of ribs are arranged circumferentially and equidistantly on the injection needle tube (4).

9. A reinforced injection needle mechanism according to claim 8, characterized in that, The ribs are rectangular or triangular in shape.

10. A reinforced injection needle mechanism according to claim 1, characterized in that, The injection cylinder (1) has a storage chamber (5) and a guide chamber (7) inside. A limiting ring groove (6) is provided between the storage chamber (5) and the guide chamber (7), and the injection needle tube (4) is connected to the guide chamber (7).

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