Liquid injection needle
By designing a detachable injection needle structure and optimizing the flow channel design, the problem that existing injection needles cannot adapt to different injection needs has been solved, achieving efficient delivery and stable injection of electrolyte.
Patent Information
- Application Number
- CN202423265847.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The infusion channel diameter of existing injection needles is uniform, which cannot adapt to different injection needs, resulting in inconvenience in electrolyte injection.
Design a detachable injection needle structure that connects to the needle shaft via a connector, achieves sealing using an inner sealing ring, and increases the force-bearing area of the connector through a groove, facilitating needle body replacement. Combined with a beveled tip, multi-hole outlet, and conical structure, optimize electrolyte flow and reduce electrolyte overflow.
It achieves flexible adaptation of needle structure, reduces electrolyte leakage, improves injection efficiency, reduces fluid impact, enhances the stability of needle and packaging film, and adapts to different injection needs.
Smart Images
Figure CN223927616U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection needles, and more particularly to an injection needle. Background Technology
[0002] In the production process of lithium-ion cells, the packaged cells need to be injected with electrolyte through the gas bag opening to seal the injection port. In the existing design, the diameter of the infusion channel inside the injection needle is the same at all points. During use, the tail of the needle is connected to the tubing for inputting electrolyte, and the head of the needle is connected to the cell. The electrolyte flows from the tail of the needle into the infusion channel inside the needle and is finally output from the head of the needle into the battery. The existing needle structure is simple and easy to manufacture. However, because the diameter of the infusion channel is the same at all points, it cannot be adapted to different injection requirements. Utility Model Content
[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a liquid injection needle.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: an injection needle, comprising a needle body, wherein one end of the needle body is connected to a needle rod, and the electrolyte is pressurized by an injection pump and flows along the needle rod into the needle body;
[0005] The needle body includes: a connector, wherein the connector connects the needle body to the needle shaft;
[0006] The connector is detachably mounted on the needle bar, allowing the needle body to be replaced as needed. An inner sealing ring is provided between the connector and the needle bar to seal the needle body and the needle bar.
[0007] The surface of the connector has grooves, which increase the force-bearing area of the connector and facilitate disassembly.
[0008] A mounting base is installed at the free end of the needle bar. A plug rod passes through the mounting base and is inserted into the needle bar. A cylinder fixing seat is installed at the free end of the mounting base. The needle bar and the cylinder fixing seat are connected by a cylinder. A ferrule connector is installed on the side of the mounting base. The ferrule connector communicates with the interior of the mounting base. The ferrule connector is externally connected to an electrolyte delivery pump through a rubber tube.
[0009] A cone-shaped head, wherein the cone-shaped head is positioned at the free port of the connector;
[0010] The needle tip is connected to the free end of the cone, through which electrolyte flows from the needle shaft into the connector, passes through the cone, and is injected from the needle tip.
[0011] The effect achieved by the above components is as follows: the electrolyte delivery pump is placed in the electrolyte storage tank, the electrolyte delivery pump body delivers the electrolyte from the hose to the mounting base, the cylinder pulls the plug rod, the plug rod pulls out the needle rod, and then the electrolyte is input from the needle rod into the needle body, and the electrolyte is injected from the needle body.
[0012] Preferably, the free port at the tip of the needle is provided with a beveled tip.
[0013] The effects achieved by the above components are as follows: the free port of the needle tip is designed with a beveled edge to prevent the needle tip from scratching the PP layer inside the packaging film when it moves up and down; during the injection of electrolyte, the electrolyte gradually increases from the tail of the needle tip to the head of the needle tip; the beveled opening of the outlet reduces the force-bearing area; when the same pressure is applied, the pressure on the beveled opening will increase; and the gap between the injection needle and the main body of the battery cell inside the packaging film will increase, which will help to deliver the electrolyte.
[0014] Preferably, the free port of the needle tip is provided with a groove facing the cone, wherein a liquid outlet hole is provided on the side of the needle tip, and the liquid outlet hole penetrates the side of the needle tip.
[0015] The effects achieved by the above components are as follows: the needle tip adopts a multi-hole liquid outlet, the flow rate remains unchanged under the same pressure conditions, the cross-sectional area is increased, the flow velocity of the liquid outlet is reduced, the electrolyte overflow and backflow are reduced, the liquid outlet is misaligned, the electrolyte overflows to both sides or the contact surface of the object, and falls freely, and the speed is reduced.
[0016] Preferably, the needle tip has an internal cavity that extends through the needle tip. The cavity has a frustum-shaped structure and gradually increases in size from the direction away from the cone tip.
[0017] The effects achieved by the above components are as follows: the injection needle gradually increases in size, and the outlet, i.e. the opening, gradually expands, which can change the direction or speed of electrolyte flow. At the same time, it helps to reduce the change in the flow velocity of the electrolyte in the pipeline, thereby reducing the impact force caused by the change in fluid velocity and reducing electrolyte overflow at the moment of dispensing.
[0018] Preferably, the needle tip has a conical structure, wherein the tip of the conical structure is far from the cone, and the inner cavity of the needle tip gradually decreases in size.
[0019] The effect achieved by the above components is that the injection needle becomes smaller and the outlet, i.e. the opening, gradually shrinks, which can change the direction or speed of electrolyte flow and help increase the flow rate of electrolyte in the pipeline, thereby reducing the change in fluid velocity.
[0020] Compared with the prior art, the advantages and positive effects of this utility model are as follows:
[0021] In this invention, the connector is detachably mounted on the needle bar, and the needle body can be replaced as needed using the connector. An inner sealing ring is provided between the connector and the needle bar to seal the needle body and the needle bar. Attached Figure Description
[0022] Figure 1 This utility model provides a schematic diagram of the assembly structure of an injection needle;
[0023] Figure 2 A schematic diagram of the structure of an injection needle according to Embodiment 1 of this utility model is provided;
[0024] Figure 3 A cross-sectional view of an embodiment 1 of the present invention is provided;
[0025] Figure 4 A schematic diagram of the structure of an injection needle embodiment 2 of this utility model is provided;
[0026] Figure 5 A cross-sectional view of embodiment 2 of the present invention for an injection needle is provided.
[0027] Figure 6 A schematic diagram of the structure of an injection needle embodiment 3 of this utility model is provided;
[0028] Figure 7 A cross-sectional view of embodiment 3 of the present invention is provided.
[0029] Figure 8 A schematic diagram of the structure of an injection needle according to Embodiment 4 of this utility model is provided;
[0030] Figure 9 A cross-sectional view of embodiment 5 of the present invention is provided.
[0031] Legend: 1. Connector; 2. Cone; 3. Needle tip; 4. Groove; 5. Inner sealing ring; 6. Needle rod; 7. Mounting seat; 8. Cylinder mounting seat; 9. Plug rod; 10. Compression fitting. Detailed Implementation
[0032] like Figure 1The diagram shows an injection needle, comprising a needle body, one end of which is connected to a needle shaft 6. Electrolyte is pressurized by an injection pump and flows along the needle shaft 6 into the needle body. The needle body includes a connector 1, which connects the needle body to the needle shaft 6. The connector 1 is detachably mounted on the needle shaft 6, allowing the needle body to be replaced as needed. An inner sealing ring 5 is provided between the connector 1 and the needle shaft 6 to seal the needle body and the needle shaft 6. A groove 4 is formed on the surface of the connector 1, which increases the force-bearing area of the connector 1 and facilitates disassembly of the connector 1. A mounting base is installed at the free end of the needle rod 6. A plug rod 9 passes through the mounting base 7 and is inserted into the needle rod 6. A cylinder fixing seat 8 is installed at the free end of the mounting base 7. The needle rod 6 and the cylinder fixing seat 8 are connected by a cylinder. A ferrule connector 10 is installed on the side of the mounting base 7, which connects to the inside of the mounting base 7. The ferrule connector is connected to an electrolyte delivery pump via a rubber tube. A cone 2 is located at the free port of the connector 1. A needle end 3 is connected to the free end of the cone 2. Electrolyte flows from the needle rod 6 into the connector 1, passes through the cone 2, and is injected from the needle end 3. The electrolyte delivery pump is placed in an electrolyte storage tank. The electrolyte delivery pump delivers electrolyte from the rubber tube to the mounting base 7. The cylinder pulls the plug rod 9, which withdraws the needle rod 6, allowing electrolyte to enter the needle body from the needle rod 6 and then be injected from the needle body.
[0033] Example 1, as Figure 2-3 As shown, an injection needle has a beveled tip at the free end of the needle tip 3. The beveled tip at the free end of the needle tip 3 is designed to prevent the needle tip 3 from scratching the PP layer inside the packaging film when it moves up and down. During the injection of electrolyte, the electrolyte gradually increases in size from the tail to the head of the needle tip 3. The beveled opening of the liquid outlet reduces the force-bearing area. When the same pressure is applied, the pressure on the beveled opening will increase. The gap between the injection needle and the battery cell body inside the packaging film increases, which helps to deliver the electrolyte.
[0034] Example 2, as Figure 4-5 As shown, an injection needle has a groove 4 at the free end of the needle tip 3 facing the cone tip 2. The side of the needle tip 3 has an outlet hole that penetrates the side of the needle tip 3. The needle tip 3 adopts a multi-hole outlet. Under the same pressure conditions, the flow rate remains unchanged, the cross-sectional area is increased, and the flow velocity of the outlet hole is reduced to reduce electrolyte overflow and backflow. The outlet hole is misaligned, and the electrolyte overflows to both sides or the contact surface of the object and falls freely, with a reduced velocity.
[0035] Example 3, as Figure 6-7As shown, the needle tip 3 has an internal cavity that extends through it. The cavity has a frustum-shaped structure and gradually increases in size from the direction away from the cone 2. The injection needle gradually increases in size, and the outlet, i.e., the opening, gradually expands. This can change the flow direction or speed of the electrolyte fluid and help reduce the velocity change of the electrolyte fluid in the pipeline, thereby reducing the impact force caused by the velocity change of the fluid and reducing electrolyte overflow at the moment of dispensing.
[0036] Example 4, as Figure 8-9 As shown, the needle tip 3 has a conical structure, with the tip of the conical structure far away from the cone 2. The inner cavity of the needle tip 3 gradually becomes smaller, the injection needle becomes smaller, and the outlet, i.e., the opening, gradually shrinks. This can change the direction or speed of the electrolyte flow and help increase the flow rate of the electrolyte in the pipeline, thereby reducing the change in fluid velocity.
[0037] Working principle: Connector 1 is detachably mounted on needle bar 6. The needle body can be replaced as needed using connector 1. An inner sealing ring 5 is provided between connector 1 and needle bar 6 to seal the needle body and needle bar 6. The groove 4 increases the force-bearing area of connector 1, facilitating disassembly. An electrolyte delivery pump is placed in the electrolyte storage tank. The pump delivers electrolyte from the tubing to the mounting base 7. A cylinder pulls the plug rod 9, which withdraws the needle bar 6, allowing electrolyte to enter the needle body from the needle bar 6 and then exit from the needle body. The free end of needle tip 3 has a beveled design to prevent scratching the PP layer inside the packaging film when the needle tip 3 moves up and down. During electrolyte injection, the electrolyte gradually increases in volume from the tail to the head of needle tip 3. The beveled outlet reduces the force-bearing area. When the same pressure is applied, the pressure on the beveled part will increase, and the gap between the injection needle and the main body of the battery cell inside the packaging film will increase, which will help to deliver the electrolyte. The needle end 3 adopts a multi-hole outlet. Under the same pressure conditions, the flow rate remains unchanged, the cross-sectional area increases, and the flow velocity of the outlet hole decreases, reducing electrolyte overflow and backflow. The staggered design of the outlet hole allows the electrolyte to overflow to both sides or the contact surface of the object and fall freely, reducing the speed. The injection needle gradually increases in size, and the outlet, i.e., the opening part gradually expands, which can change the flow direction or speed of the electrolyte fluid. At the same time, it helps to reduce the change in the flow velocity of the electrolyte fluid in the pipeline, thereby reducing the impact force caused by the change in fluid velocity and reducing electrolyte overflow at the moment of outlet. The injection needle gradually decreases in size, and the outlet, i.e., the opening part gradually narrows, which can change the flow direction or speed of the electrolyte fluid. At the same time, it helps to increase the change in the flow velocity of the electrolyte fluid in the pipeline, thereby reducing the increase in fluid velocity change.
[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, still fall within the protection scope of this utility model's technical solution. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.
Claims
1. A fill needle comprising a needle body, characterized by: The needle body is connected with the needle rod (6) at one end, and electrolyte flows into the needle body along the needle rod (6) through a perfusion pump. The needle body comprises a connecting head (1), wherein the connecting head (1) connects the needle body with the needle rod (6); A tapered head (2) is arranged at the free end of the connecting head (1); A needle end (3) is connected with the free end of the tapered head (2), wherein electrolyte flows from the needle rod (6) into the connecting head (1), passes through the tapered head (2) and is injected from the needle end (3).
2. The fill needle of claim 1, wherein: The free end of the needle end (3) is provided with a tip bevel.
3. The priming needle of claim 1, wherein: The free end of the needle end (3) is provided with a groove facing the tapered head (2), wherein a liquid outlet hole is arranged on the side surface of the needle end (3) and penetrates the side surface of the needle end (3).
4. The priming needle of claim 1, wherein: The needle end (3) has an internal cavity, wherein the cavity penetrates the needle end (3) and has a frustoconical structure, and the cavity gradually increases in size from the direction of the tapered head (2) to the direction away from the tapered head (2).
5. The priming needle of claim 1, wherein: The needle end (3) has a conical structure, wherein the tip of the conical structure is away from the tapered head, and the internal cavity of the needle end (3) gradually decreases in size.
6. The priming needle of claim 1, wherein: The surface of the connecting head (1) is provided with a groove (4).