Liquid injection device
By using the flow-guiding and blocking structure and the elastic reset component design of the electrolyte injection device, the problems of electrolyte splashing and dripping are solved, improving battery production efficiency and quality, reducing equipment costs, and avoiding lithium salt crystallization and corrosion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-04-03
AI Technical Summary
In the traditional battery electrolyte filling process, the electrolyte is prone to splashing or dripping, leading to lithium salt crystallization and corrosion. Moreover, the existing technology involves a complex and inefficient vacuum process.
An injection device is adopted, including a movable injection needle, an elastic reset component, and a sealing assembly. A flow-guiding and blocking structure is designed, and the elastic reset component is used to achieve automatic reset, eliminating the need for a vacuum pump and ensuring that the electrolyte is accurately guided to the designated area.
To prevent electrolyte splashing and dripping, reduce contact with battery cover and terminals, improve production efficiency, reduce equipment costs, optimize production processes, and enhance battery quality and reliability.
Smart Images
Figure CN224082665U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery manufacturing technology, and in particular to a liquid injection device. Background Technology
[0002] Electrolyte injection is a crucial step in battery manufacturing. In traditional battery injection processes, electrolyte easily splashes onto the battery cover and terminals. After injection, residual electrolyte on the injection hole walls also drips onto the cover, causing lithium salt crystals to form on the cover, terminals, and surrounding areas, potentially leading to corrosion. This not only affects the battery's appearance but also severely impacts its long-term performance and lifespan. Furthermore, excessively high flow rates during injection can cause the electrolyte to directly contact the electrodes, resulting in wrinkles on the electrode surface, further affecting the battery's structure and performance.
[0003] Currently, the main approach to addressing these issues in existing technologies is to place the injection pinhole within a vacuum chamber and seal it with a sealing ring. After injection, a vacuum is applied to prevent electrolyte dripping and avoid electrolyte residue on the pinhole wall. However, this method still has significant drawbacks: after injection, a vacuum process is still required to ensure that the electrolyte on the pinhole wall does not drip, which not only increases the complexity of the production process and equipment costs, but also results in low overall production efficiency due to the time required for the vacuuming operation.
[0004] To overcome these shortcomings, there is an urgent need for a new and more efficient battery electrolyte injection solution that can prevent electrolyte splashing or dripping during the injection process, improve production efficiency, and reduce costs. Utility Model Content
[0005] To address the problem of electrolyte splashing or dripping during the injection process, this application provides an electrolyte injection device.
[0006] The liquid injection device provided in this application adopts the following technical solution:
[0007] A liquid injection device, comprising:
[0008] The main body for injection includes a movable injection needle;
[0009] An elastic reset element is connected to the injection needle and is used to provide a reset force;
[0010] A sealing assembly includes a sealing cap and a sleeve fitted over the outside of the injection body, the sleeve having an outlet, and the sealing cap being linked to the injection needle via a connector;
[0011] During injection, the injection needle moves the connector and the sealing cap, the outlet opens, and the sealing cap and the connector form a flow-guiding and blocking structure, allowing the liquid flowing out of the injection needle to flow out in all directions; after the injection is completed, the elastic reset member drives the injection needle to reset and closes the sealing cap and the outlet to form a seal.
[0012] By adopting the above technical solutions, this electrolyte injection device, through the rational design of the injection needle and sealing components, can form a flow-guiding and blocking structure during injection. The electrolyte is accurately guided to the required area during injection, preventing electrolyte splashing and dripping, reducing the probability of electrolyte contacting the battery cover and terminals, thereby avoiding problems such as lithium salt crystallization and corrosion. The addition of the elastic reset component provides an automatic reset function, improving production efficiency and the automation level of the device, reducing equipment costs, optimizing the production process, and effectively improving battery quality and reliability. By eliminating the vacuum pump and related components, this application can effectively reduce the equipment investment in the production line. At the same time, the design of the electrolyte injection device is simple and compact, reducing reliance on high-cost precision equipment and lowering the manufacturing and maintenance costs of the equipment.
[0013] In one specific implementation, the injection body further includes a cavity, the injection needle is inserted inside the cavity, the sleeve is fitted outside the cavity, and the injection needle moves within the cavity and the outlet.
[0014] By adopting the above technical solution, the movement path of the injection needle between the cavity and the outlet is optimized to control the liquid flow, ensuring uniformity and flow stability during the injection process.
[0015] In one specific implementation, the elastic reset element is a spring, which is disposed in the cavity and fitted outside the injection needle. The outer wall of the injection needle is provided with a connecting part, one end of the spring is connected to the connecting part, and the other end is connected to the sleeve.
[0016] By adopting the above technical solution, the spring, as an elastic reset component, can ensure that the injection needle automatically returns to its initial position after each injection process, thus ensuring the continuity and stability of the equipment and preventing the injection needle from being operated incorrectly or deviating from its normal working position. Furthermore, the use of the spring to achieve automatic reset reduces the need for complex mechanical structures, making the design simpler.
[0017] In one specific implementation, the connecting portion slides and abuts against the inner wall of the cavity.
[0018] By adopting the above technical solution, the sliding contact design between the connecting part and the inner wall of the cavity helps guide the movement path of the injection needle. It also ensures that the injection needle can return to its original position along the predetermined path after the injection process is completed, ensuring that the injection needle remains in the correct position throughout the process, avoiding deviation or inaccuracy, ensuring a more stable injection process, and improving the accuracy of resetting.
[0019] In one specific implementation, the sleeve is provided with a first stepped portion and a second stepped portion for contacting the object to be injected to form a seal.
[0020] By adopting the above technical solution, the sealing effect is enhanced by the combined action of the first step and the second step, avoiding liquid leakage caused by the failure of a single seal. The double seal design not only improves the sealing performance, but also ensures the stability of the injection process. The pressure and liquid flow during the injection process can be guaranteed by the sealing system, reducing the injection deviation caused by the instability of the injection path.
[0021] In one specific implementation, the sealing cap includes a snap-on cap and a sealing part, the sealing part being insertable into the liquid outlet to form a seal, and the snap-on cap being abutting against the outer wall of the liquid outlet.
[0022] By adopting the above technical solution, the design of inserting the sealing part into the liquid outlet to form a seal effectively prevents liquid leakage. At the same time, the cap abuts against the outer wall of the liquid outlet to further prevent external contaminants from entering the liquid outlet, thereby achieving efficient sealing of the liquid outlet and preventing liquid leakage and the entry of external contaminants.
[0023] In one specific implementation, the connector includes a plurality of connecting rods, one end of which is connected to the injection needle and the other end of which is connected to the sealing cap.
[0024] By adopting the above technical solution and using multiple connecting rods for support, the connection between the injection needle and the sealing cap is more stable. At the same time, the design of multiple connecting rods matching the sealing cap allows the outflowing electrolyte to spread evenly in all directions, rather than flowing in one direction. This reduces the risk of liquid accumulating in a single direction and effectively avoids problems such as leakage, liquid accumulation, or excessive flow.
[0025] In one specific implementation, a plurality of the connecting rods are evenly distributed along the circumference of the injection needle.
[0026] By adopting the above technical solution, the connecting rods are evenly distributed along the circumference, which can provide support and stability in multiple directions, reduce the concentrated effect of force in a single direction, improve the overall stability, and help the electrolyte to spread evenly when it flows out, avoiding uneven flow rate or concentrated flow in a certain direction, thereby making the electrolyte flow more stable and avoiding local splashing or accumulation.
[0027] In one specific implementation, the sleeve is a rubber sleeve.
[0028] By adopting the above technical solution and utilizing the design of the rubber sleeve, it can fit tightly with other components to form a stronger sealing effect and effectively prevent electrolyte leakage; moreover, rubber has strong elasticity and can absorb vibration or impact during operation, thereby improving overall safety and stability.
[0029] In one specific implementation, the axis of the injection needle is collinear with the axis of the outlet.
[0030] By adopting the above technical solution, the collinearity of the injection needle axis and the outlet axis ensures that the liquid accurately enters the target area from the injection needle, avoiding liquid deviation or uneven distribution. Since the axes of the injection needle and the outlet are collinear, the liquid can flow out along a direct path, preventing leakage or waste when the liquid deviates from the track, and ensuring efficient use of resources.
[0031] In summary, the beneficial technical effects of this application are as follows: the electrolyte injection device, through the rational design of the injection needle and sealing components, ensures the formation of an effective flow-guiding and blocking structure during the injection process, thereby accurately guiding the electrolyte to the designated area and avoiding the problems of liquid splashing and dripping. In addition, this design also effectively reduces the contact between the electrolyte and key parts such as the battery cover and terminals, preventing lithium salt crystallization and corrosion, and improving the stability and service life of the battery.
[0032] Furthermore, this design incorporates an elastic reset component to achieve automatic reset of the liquid injection device, significantly improving production efficiency and reducing the need for manual operation. At the same time, this design eliminates the vacuum pump and its related components, reducing equipment investment in the production line. The liquid injection device has a simple and compact structure, reducing reliance on high-precision and expensive equipment and effectively reducing equipment manufacturing and maintenance costs. It also improves the quality and reliability of battery production, ensuring the consistency and high performance of battery products, thereby enhancing the economic benefits and market competitiveness of the production line. Attached Figure Description
[0033] Figure 1 This is a schematic diagram illustrating the structure of the injection device when no liquid is injected.
[0034] Figure 2 This is a schematic diagram illustrating the structure of the injection device during liquid injection.
[0035] Explanation of reference numerals in the attached drawings: 1. Injection body; 11. Injection needle; 111. Connecting part; 12. Cavity; 2. Elastic reset element; 21. Spring; 3. Sealing assembly; 31. Sealing cap; 311. Buckle cap; 312. Blocking part; 32. Sleeve; 321. First step part; 322. Second step part; 323. Injection port; 4. Connecting element; 41. Connecting rod. Detailed Implementation
[0036] This application discloses an electrolyte injection device, which is mainly used in the electrolyte injection process during battery production. In this embodiment, the battery includes a casing, a cover plate, a cell, and terminals. The casing and the cover plate encapsulate the cell and terminals. The cover plate is provided with an injection hole, and the electrolyte injection device injects electrolyte into the battery through the injection hole.
[0037] The liquid injection device of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments described are only used to explain the basic concept of this application and do not limit the scope of protection of this application.
[0038] Reference Figure 1 and Figure 2 This embodiment relates to a liquid injection device, comprising:
[0039] The injection body 1 includes a cavity 12 and a movable injection needle 11, with the injection needle 11 inserted inside the cavity 12.
[0040] The elastic reset element 2 is connected to the injection needle 11 and is used to provide a reset force;
[0041] The sealing assembly 3 includes a sealing cap 31 and a sleeve 32 fitted outside the liquid injection body 1. The sealing cap 31 is linked to the liquid injection needle 11 through the connector 4. In this embodiment, the sleeve 32 is fitted outside the cavity 12 and has a liquid outlet 323. The liquid injection needle 11 moves within the cavity 12 and the liquid outlet 323.
[0042] In this embodiment, the axis of the injection needle 11 is collinear with the axis of the outlet 323, and the center lines of the injection needle 11, cavity 12, sleeve 32, sealing cap 31 and elastic reset member 2 are all collinearly arranged. The collinear design ensures that the liquid can flow out along an accurate path, avoids liquid deviation or uneven distribution, effectively prevents leakage and waste, and thus improves resource utilization efficiency. At the same time, it also enhances the stability of the overall structure and ensures the stability of the injection process.
[0043] Before operation, the electrolyte injection device is installed at the electrolyte injection port of the battery. The sleeve 32 abuts against the battery cover and the electrolyte injection port boss, thus forming a seal. At this time, the injection needle 11 is in the initial position, the sealing cover 31 is closed, and the outlet 323 is sealed by the sealing cover 31, thereby preventing electrolyte leakage or dripping. When the electrolyte injection begins, the injection needle 11 is pushed into the battery casing by external force, which drives the connector 4 and the sealing cover 31 to move into the battery casing together. As the injection needle 11 moves... When the sealing cap 31 is opened, the liquid outlet 323 is exposed, allowing the electrolyte to flow out smoothly through the injection needle 11. When the electrolyte flows out from the injection needle 11, it is sprayed onto the surface of the sealing cap 31. The sealing cap 31 and the connector 4 form a flow-guiding and blocking structure, which can effectively guide the electrolyte to flow into the housing in all directions, rather than flowing directly into or splashing into the injection needle 11 itself. This prevents the electrolyte from splashing onto the battery cover, terminals and other parts, avoiding lithium salt crystallization and corrosion problems.
[0044] After the electrolyte injection is completed, the elastic reset member 2 drives the injection needle 11 to return to its initial position by providing a reset force. At this time, the sealing cap 31 will re-contact with the outlet 323 to form a tight seal, preventing the electrolyte from leaking or dripping again, and ensuring the safety and stability of the electrolyte injection process.
[0045] The sleeve 32 is provided with a first step portion 321 and a second step portion 322 for contacting the object to be injected to form a seal. In this embodiment, the sleeve 32 abuts against the cover plate of the battery, the first step abuts against the injection hole protrusion of the battery, and the second step abuts against the upper surface of the battery cover plate, thereby forming a double seal. The first step portion 321 and the second step portion 322 work together to enhance the sealing effect and avoid liquid leakage caused by the failure of a single seal. The double seal design not only improves the sealing performance, but also ensures the stability during the injection process. The pressure and liquid flow during the injection process can be guaranteed by the sealing system, reducing the injection deviation caused by the instability of the injection path.
[0046] In this embodiment, the sleeve 32 is a rubber sleeve, which allows the sleeve 32 to fit tightly with other components, forming a stronger sealing effect and effectively preventing electrolyte leakage; and rubber has strong elasticity, which can absorb vibration or impact during operation, thereby improving the overall safety and stability.
[0047] The sealing cap 31 includes a snap cap 311 and a sealing part 312. A connector 4 connects the injection needle 11 and the sealing part 312 of the sealing cap 31. The sealing part 312 can be inserted into the outlet 323 and form a seal. The snap cap 311 can abut against the outer wall of the outlet 323. The connector 4 connects the injection needle 11 to the sealing part 312 of the sealing cap 31, so that the sealing part 312 can be inserted into the outlet 323 and effectively seal it, thereby preventing liquid leakage. At the same time, the contact between the snap cap 311 and the outer wall of the outlet 323 further enhances the sealing effect, ensuring the sealing and safety during the liquid injection process and effectively preventing liquid leakage.
[0048] The connector 4 includes multiple connecting rods 41. One end of each connecting rod 41 is connected to the injection needle 11, and the other end is connected to the sealing part 312 of the sealing cap 31. The multiple connecting rods 41 are evenly distributed along the circumference of the injection needle 11. The evenly distributed connecting rods 41 can provide support and stability in multiple directions, reduce the concentrated effect of force in one direction, and improve overall stability. At the same time, the matching design of multiple connecting rods 41 with the sealing cap 31 can make the outflowing electrolyte diffuse evenly in all directions, rather than concentrate in one direction, thereby reducing the risk of liquid accumulation in one direction and avoiding problems such as leakage, liquid accumulation, or excessive flow.
[0049] In this embodiment, the elastic reset member 2 is a spring 21. The spring 21 is disposed inside the cavity 12 and fitted outside the injection needle 11. The outer wall of the injection needle 11 is provided with a connecting part 111. One end of the spring 21 is connected to the connecting part 111, and the other end is connected to the sleeve 32. In this embodiment, the connecting part 111 slides and abuts along the inner wall of the cavity 12.
[0050] When the injection operation begins, the injection needle 11 moves within the cavity 12. The connecting part 111 slides along the inner wall of the cavity 12 to abut against it, guiding the movement path of the injection needle 11. The movement of the injection needle 11 compresses the spring 21, causing the spring 21 to generate a reverse force. When the operation is completed, the rebound force of the spring 21 will cause the injection needle 11 to automatically return to its original position. At this time, the connecting part 111 slides along the inner wall of the cavity 12 to abut against it, ensuring that the injection needle 11 can return to its original position according to the predetermined path, avoiding deviation or inaccuracy, ensuring a more stable injection process, and improving the accuracy of resetting.
[0051] As an elastic reset component 2, the spring 21 ensures that the injection needle 11 automatically returns to its initial position after each injection process, ensuring the continuity and stability of the equipment and preventing the injection needle 11 from being operated incorrectly or deviating from its normal working position. Furthermore, the automatic reset achieved by the spring 21 reduces the need for complex mechanical structures, making the design simpler.
[0052] The implementation principle of this application embodiment is as follows: Before operation, the liquid injection device is installed at the liquid injection hole position of the battery, the sleeve 32 abuts against the battery cover plate, the first step of the sleeve 32 abuts against the protrusion of the liquid injection hole of the battery, and the second step of the sleeve 32 abuts against the upper surface of the battery cover plate, thereby forming a double seal; at this time, the liquid injection needle 11 is in the initial position, the sealing cover 31 is closed, and the liquid outlet 323 is completely blocked to prevent electrolyte leakage or dripping;
[0053] At the start of liquid injection, an external force pushes the injection needle 11 into the battery casing. The connecting part 111 of the injection needle 11 contacts the inner wall of the cavity 12 and slides along the inner wall to ensure that the injection needle 11 moves along a predetermined path. The injection needle 11 drives the connecting rod 41 and the sealing cover 31 to move into the battery casing together. At the same time, the movement of the injection needle 11 will compress the spring 21, and the spring 21 stores energy.
[0054] As the injection needle 11 moves, the sealing cap 31 opens, exposing the outlet 323. At this time, the electrolyte can flow out smoothly through the injection needle 11. When the electrolyte flows out from the injection needle 11, it is sprayed onto the surface of the sealing cap 31. The sealing cap 31 and multiple connecting rods 41 form a flow guiding and blocking structure. This structure can guide the electrolyte to flow around and into the battery casing, instead of flowing directly or splashing through the injection needle 11 itself. This prevents the electrolyte from splashing onto the battery cover, terminals, and other parts, avoiding lithium salt crystallization and corrosion problems.
[0055] After the electrolyte injection is completed, the spring 21 releases the compression force to provide a reset force for the injection needle 11, driving the injection needle 11 back to the initial position. At this time, the sealing cap 31 contacts the outlet 323 again, and the sealing part 312 of the sealing cap 31 is inserted into the outlet 323 to seal it. The buckle 311 of the sealing cap 31 abuts against the outer wall of the outlet 323 to form a tight seal to prevent electrolyte leakage or dripping.
[0056] This application, through the rational configuration of the injection needle 11 and sealing component 3, ensures the formation of a flow-guiding and blocking structure during the injection process. This allows the electrolyte to be accurately guided to the required area, preventing splashing and dripping, and reducing contact between the electrolyte and the battery cover, terminals, and other parts, thereby effectively avoiding lithium salt crystallization and corrosion problems. Simultaneously, the addition of the elastic reset component 2 enables an automatic reset function, improving production efficiency and the automation level of the device. This design eliminates the need for a vacuum pump and related components, reducing investment in production line equipment. Furthermore, the injection device has a simple and compact structure, reducing reliance on high-cost precision equipment, thereby lowering equipment manufacturing and maintenance costs, optimizing the production process, and improving battery quality and reliability.
[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A liquid injection device characterized by comprising: The application relates to a liquid injection device. The device comprises: a liquid injection body (1) comprising a movable liquid injection needle (11); an elastic reset member (2) connected with the liquid injection needle (11) and used for providing a reset force; a sealing assembly (3) comprising a sealing cover (31) and a sleeve (32) sleeved outside the liquid injection body (1), the sleeve (32) having a liquid outlet (323), and the sealing cover (31) being linked with the liquid injection needle (11) through a connecting member (4); 2. The liquid injection device according to claim 1, wherein: During liquid injection, the liquid injection needle (11) drives the connecting member (4) and the sealing cover (31) to move, the liquid outlet (323) is opened, the sealing cover (31) and the connecting member (4) form a flow guiding and blocking structure, and the liquid injection needle (11) flows out liquid to the surroundings; after liquid injection is completed, the elastic reset member (2) drives the liquid injection needle (11) to reset and makes the sealing cover (31) close the liquid outlet (323) to form a seal.
3. The liquid injection device according to claim 2, wherein: The liquid injection body (1) further comprises a cavity (12), the liquid injection needle (11) is arranged inside the cavity (12), the sleeve (32) is sleeved outside the cavity (12), and the liquid injection needle (11) moves in the cavity (12) and the liquid outlet (323).
4. The liquid injection apparatus according to claim 3, wherein: The elastic reset member (2) is a spring (21), the spring (21) is arranged inside the cavity (12) and sleeved outside the liquid injection needle (11), an outer wall of the liquid injection needle (11) is provided with a connecting portion (111), one end of the spring (21) is connected with the connecting portion (111), and the other end of the spring (21) is connected with the sleeve (32).
5. The liquid injection apparatus according to claim 1, wherein: The connecting portion (111) slides against the inner wall of the cavity (12).
6. The liquid injection apparatus according to claim 1, wherein: The sleeve (32) is provided with a first step portion (321) and a second step portion (322) and is used for abutting against a liquid injection object to form a seal.
7. The liquid injection apparatus according to claim 1, wherein: The sealing cover (31) comprises a buckle cover (311) and a plugging portion (312), the plugging portion (312) can be inserted into the liquid outlet (323) and form a plugging, and the buckle cover (311) can abut against the outer wall of the liquid outlet (323).
8. The liquid injection device according to claim 7, wherein: The connecting member (4) comprises a plurality of connecting rods (41), one end of the plurality of connecting rods (41) is connected with the liquid injection needle (11), and the other end of the plurality of connecting rods (41) is connected with the sealing cover (31).
9. The liquid injection apparatus according to claim 1, wherein: The plurality of connecting rods (41) are uniformly distributed along the circumference of the liquid injection needle (11).
10. The liquid injection apparatus according to claim 1, wherein: The sleeve (32) is a rubber sleeve. The axis of the liquid injection needle (11) is collinear with the axis of the liquid outlet (323).