Liquid injection nozzle and liquid injection equipment

Abstract

The utility model provides a liquid injection nozzle and liquid injection equipment, and belongs to the technical field of batteries. The liquid injection nozzle comprises a liquid injection channel, a circular ring part, a circular tube part and a conical nozzle part which are fixedly connected in sequence, the center lines of the circular ring part, the circular tube part and the conical nozzle part are located on the same straight line, the outer diameter of the circular ring part is larger than that of the circular tube part, and the liquid injection channel penetrates from the inlet end of the circular ring part to the outlet end of the conical nozzle part. The inner wall of the liquid injection channel is provided with a plurality of annular grooves which are sequentially arranged along the axial direction of the liquid injection channel, and electrolyte can smoothly flow into the battery from the liquid injection channel of the liquid injection nozzle in the liquid injection process. And after liquid injection of the liquid injection nozzle is completed, under the condition that extra accessories are not added, natural dripping of the electrolyte due to gravity is prevented, the cleanliness of the liquid injection environment is improved, the productivity is improved, and the cost of a production line is reduced. Besides, compared with the mode that an auxiliary structure or device is additionally arranged in the liquid injection nozzle to prevent liquid dropping, the structure of the liquid injection nozzle is simplified, the stability and the reliability of the liquid injection nozzle are improved, and the manufacturing cost is remarkably reduced.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the mass production of batteries, electrolyte injection is one of the key processes. The injection of electrolyte requires precise control, and after injection, it is necessary to prevent electrolyte from dripping from the injection nozzle and contaminating the battery surface. Electrolyte dripping onto the battery surface not only increases the difficulty of subsequent cleaning processes, but may also cause corrosion of the steel casing and cells, and even affect welding, thereby seriously affecting the reliability, performance, and lifespan of the battery. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a liquid injection nozzle and liquid injection device that improves the cleanliness of the liquid injection environment.

[0005] An embodiment of the first aspect of this application provides a liquid injection nozzle, which includes an injection channel, an annular portion, a circular tube portion, and a conical nozzle portion. The annular portion, the circular tube portion, and the conical nozzle portion are fixedly connected in sequence, and the center lines of the annular portion, the circular tube portion, and the conical nozzle portion are on the same straight line. The outer diameter of the annular portion is larger than the outer diameter of the circular tube portion. The injection channel extends from the inlet end of the annular portion to the outlet end of the conical nozzle portion. An annular groove is formed on the inner wall of the injection channel. The number of annular grooves is multiple, and the multiple annular grooves are arranged sequentially along the axial direction of the injection channel.

[0006] In the technical solution of this application embodiment, by providing multiple annular grooves arranged sequentially along the axial direction of the injection channel on the inner wall of the injection nozzle, the electrolyte can smoothly flow from the injection channel of the injection nozzle into the battery during the injection process. Furthermore, after the injection is completed, without adding any additional components, it prevents the electrolyte from dripping naturally due to gravity, achieving an anti-drip function, improving the cleanliness of the injection environment, increasing production capacity, and reducing production line costs. In addition, providing annular grooves on the inner wall of the injection channel in the injection nozzle simplifies the structure of the injection nozzle compared to adding auxiliary structures or devices to prevent dripping, improving its stability and reliability, and significantly reducing manufacturing costs.

[0007] In some embodiments, the depth of the annular groove is less than or equal to a preset multiple of the inner diameter of the injection channel, wherein the depth is the distance from the bottom of the annular groove to the inner surface of the injection channel. Setting the depth of the annular groove to be less than or equal to a preset multiple of the inner diameter of the injection channel can both avoid affecting the injection flow rate in the injection channel and effectively retain residual electrolyte in the injection channel after injection.

[0008] In some embodiments, there are multiple annular grooves, and the interval between any two adjacent annular grooves along the axial direction of the injection channel is less than a first preset threshold. This interval, being less than the first preset threshold along the axial direction of the injection channel, reduces the probability of electrolyte dripping naturally due to gravity and balances the resistance to electrolyte flow in the injection channel.

[0009] In some embodiments, the tangent of the annular groove forms an angle with the horizontal line, wherein the horizontal line is perpendicular to the axis of the annular groove. This angle between the tangent of the annular groove and the horizontal line further reduces the probability of electrolyte dripping naturally due to gravity after the electrolyte has been injected through the injection nozzle.

[0010] In some embodiments, the included angle is greater than a first preset angle and less than a second preset angle. The angle formed by the tangent of the annular groove and the horizontal line is greater than the first preset angle and less than the second preset angle, which can both prevent the electrolyte from dripping naturally due to gravity and allow the electrolyte to flow out smoothly during the injection process.

[0011] In some embodiments, the annular groove is a continuous spiral groove. The continuous spiral groove further facilitates the smooth flow of electrolyte during the injection process and also simplifies the structure of the injection nozzle.

[0012] In some embodiments, the inner wall of the injection channel is made of superhydrophobic coated stainless steel. Superhydrophobic coated stainless steel, through its triple effects of mechanical strengthening, chemical corrosion protection, and physical hydrophobicity, is a crucial guarantee for the long-term reliability of the injection nozzle. It also enables the nozzle to inject large quantities of liquid efficiently, further reducing maintenance costs.

[0013] In some embodiments, the diameter of the conical nozzle is smaller than the diameter of the battery's filling hole. Because the diameter of the conical nozzle is smaller than the diameter of the battery's filling hole, when the conical nozzle is inserted into the filling hole, the end face of the conical nozzle abuts against the end face inside the filling hole. Therefore, no additional structure is needed, and the filling hole can play a supporting role, resulting in a simple structure.

[0014] In some embodiments, an annular groove is located at the circular tube portion and the conical nozzle portion. The injection channel extends from the center of the end of the circular tube portion to the center of the end of the conical nozzle portion. The annular groove at the circular tube portion and the conical nozzle portion can reduce the probability of electrolyte accumulation during the injection process.

[0015] A second aspect of this application provides a liquid injection device, including the injection nozzle from the foregoing embodiments. By providing an annular groove on the inner wall of the injection channel in the injection nozzle, after liquid injection is completed, the electrolyte is prevented from dripping naturally due to gravity without the addition of extra accessories, thus achieving an anti-drip function, improving the cleanliness of the injection environment, increasing production capacity, and reducing production line costs. Furthermore, providing an annular groove on the inner wall of the injection channel in the injection nozzle simplifies the nozzle's structure, improves its stability and reliability, and significantly reduces manufacturing costs.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0018] Figure 1 This is a cross-sectional view of the injection nozzle of some embodiments of this application;

[0019] Figure 2 This is a perspective view of the injection nozzle of some embodiments of this application;

[0020] Figure 3 A partial magnification of the injection channel in some embodiments of this application. Figure 1 ;

[0021] Figure 4 A partial magnification of the injection channel in some embodiments of this application. Figure 2 ;

[0022] Figure 5 A partial magnification of the injection channel in some embodiments of this application. Figure 3 ;

[0023] Figure 6 A partial magnification of the injection channel in some embodiments of this application. Figure 4 ;

[0024] Figure 7 This is a schematic diagram of a continuous spiral groove according to some embodiments of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1000, Injection nozzle;

[0027] 100. Injection channel; 110. Annular groove; 120. Inlet end; 130. Outlet end;

[0028] 200, Circular section; 300, Circular tube section; 400, Conical nozzle section. Detailed Implementation

[0029] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0034] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0035] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0036] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0037] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0038] In the mass production of batteries, electrolyte filling is one of the key processes. The injection of electrolyte requires precise control, and after filling, it's crucial to prevent electrolyte from dripping from the filling nozzle and contaminating the battery surface. This contamination not only increases the difficulty of subsequent cleaning processes but can also lead to corrosion of the steel casing and cells, and even affect welding. Traditional filling nozzle designs often cannot completely prevent electrolyte contamination. After filling, electrolyte can easily drip from the nozzle due to gravity or residual pressure, causing surface contamination of the battery.

[0039] In related technologies, drip prevention is achieved by adding auxiliary structures or devices to the injection nozzle. However, these additional tooling components increase the nozzle's complexity, leading to decreased structural stability. In actual production, the injection nozzle needs to withstand certain pressures and vibrations; complex structures are prone to malfunctions, reducing equipment reliability. Furthermore, adding extra components significantly increases manufacturing costs. Therefore, there is still considerable room for improvement in drip prevention and structural optimization in related technologies.

[0040] Based on this, this application discloses an injection nozzle. By providing multiple annular grooves arranged sequentially along the axial direction of the injection channel on the inner wall of the injection nozzle, the electrolyte can smoothly flow from the injection channel of the nozzle into the battery during the injection process. Furthermore, after injection is completed, without adding any additional components, it prevents the electrolyte from dripping naturally due to gravity, achieving an anti-drip function, improving the cleanliness of the injection environment, increasing production capacity, and reducing production line costs. In addition, providing annular grooves on the inner wall of the injection channel simplifies the structure of the injection nozzle compared to adding auxiliary structures or devices to prevent dripping, improving its stability and reliability, and significantly reducing manufacturing costs.

[0041] The liquid injection nozzle disclosed in this application can be used, but is not limited to, in the battery production process.

[0042] This application provides a liquid injection nozzle 1000. Figure 1 This is a cross-sectional view of the injection nozzle 1000 according to some embodiments of this application. Figure 2 This is a perspective view of the injection nozzle 1000 according to some embodiments of this application. Figure 3 A partial magnification of the injection channel in some embodiments of this application. Figure 1 ,like Figures 1 to 3 As shown, the injection nozzle 1000 includes an injection channel 100, an annular portion 200, a circular tube portion 300, and a conical nozzle portion 400. The annular portion 200, the circular tube portion 300, and the conical nozzle portion 400 are fixedly connected in sequence. The center lines of the annular portion 200, the circular tube portion 300, and the conical nozzle portion 400 are on the same straight line. The outer diameter of the annular portion 200 is larger than the outer diameter of the circular tube portion 300. The injection channel 100 extends from the inlet end 120 of the annular portion 200 to the outlet end 130 of the conical nozzle portion 400. An annular groove 110 is provided on the inner wall of the injection channel 100. There are multiple annular grooves 110, and the multiple annular grooves 110 are arranged sequentially along the axial direction X of the injection channel 100.

[0043] In this embodiment, the injection nozzle 1000 can be integrally formed. The outer diameter of the annular portion 200 is larger than the outer diameter of the circular tube portion 300, which facilitates the installation of the injection nozzle 1000 onto the injection machine. The injection channel 100 extends from the inlet end 120 of the annular portion 200 to the outlet end 130 of the conical nozzle portion 400, which facilitates electrolyte injection.

[0044] In this embodiment, when electrolyte is injected into the battery using the injection nozzle 1000, the electrolyte flows through the injection channel 100. Due to the presence of positive pressure during the injection process, the annular groove 110 has minimal impact on the electrolyte flow rate, allowing the electrolyte to smoothly pass through the injection channel 100 and be injected into the battery. After injection stops, any electrolyte remaining at the end of the injection nozzle 100 is trapped by the annular groove 110 on the inner wall of the injection channel 100. Furthermore, due to the low surface tension of the electrolyte, capillary effect prevents the electrolyte from dripping naturally due to gravity.

[0045] In some embodiments, since the annular groove 110 can prevent the electrolyte from dripping naturally due to gravity, and the obstruction ability of a single annular groove 110 is limited, the number of annular grooves 110 can be multiple. Meanwhile, in order for the electrolyte to flow smoothly out of the injection channel 100 during the injection process, multiple annular grooves 110 can be arranged sequentially along the axial direction X of the injection channel 100, and the interval between any two adjacent annular grooves 110 can be less than a first preset threshold.

[0046] In other embodiments, the depth of the annular groove 110 may be less than or equal to a preset multiple of the inner diameter of the injection channel 100, wherein the depth is the distance from the bottom of the annular groove 110 to the inner surface of the injection channel 100. In still other embodiments, the tangent of the annular groove 110 forms an angle with the horizontal line, the degree of the angle being greater than a first preset degree and less than a second preset degree, wherein the horizontal line is perpendicular to the axis of the annular groove 110.

[0047] In this embodiment, by providing multiple annular grooves 110 arranged sequentially along the axial direction X of the injection channel 100 on the inner wall of the injection nozzle 1000, the electrolyte can smoothly flow from the injection channel 100 of the injection nozzle 1000 into the battery during the injection process. Furthermore, after the injection nozzle 1000 is filled, it prevents the electrolyte from dripping naturally due to gravity without adding any additional components, achieving an anti-drip function, improving the cleanliness of the injection environment, increasing production capacity, and reducing production line costs. In addition, providing annular grooves 110 on the inner wall of the injection channel 100 of the injection nozzle 1000 simplifies the structure of the injection nozzle 1000 compared to adding auxiliary structures or devices to prevent dripping, improving its stability and reliability, and significantly reducing manufacturing costs.

[0048] Figure 4 A partial magnification of the injection channel in some embodiments of this application. Figure 2 ,like Figure 4 As shown, the depth H of the annular groove 110 is less than or equal to a preset multiple of the inner diameter R of the injection channel 100, where the depth H is the distance from the bottom of the annular groove 110 to the inner surface of the injection channel 100.

[0049] In this embodiment, if the depth H of the annular groove 110 is too large, it will affect the injection flow rate in the injection channel 100 during the electrolyte injection process. If the depth H of the annular groove 110 is too small, it will result in the inability to effectively retain residual electrolyte after the injection is completed.

[0050] For example, the depth H of the annular groove 110 is less than or equal to one-tenth of the inner diameter R of the injection channel 100, and the depth H of the annular groove 110 can be greater than 0.1 mm and less than 0.3 mm.

[0051] In this embodiment, the depth H of the annular groove 110 is set to be no greater than a preset multiple of the inner diameter R of the injection channel 100. This not only avoids affecting the injection flow rate in the injection channel 100 but also effectively traps the residual electrolyte in the injection channel 100 after the injection is completed.

[0052] Figure 5 A partial magnification of the injection channel in some embodiments of this application. Figure 3 ,like Figure 5 As shown, there are multiple annular grooves 110. Along the axial direction X of the injection channel 100, the interval D between any two adjacent annular grooves 110 is less than a first preset threshold.

[0053] In this embodiment, after the injection nozzle 1000 stops injecting electrolyte, the electrolyte remaining at the end of the injection nozzle 1000 is trapped by the annular groove 110 on the inner wall of the injection channel 100. Furthermore, due to the low surface tension of the electrolyte, capillary effect can prevent the electrolyte from dripping naturally due to gravity. Figure 5 As shown, the interval D between the two annular grooves 110 is the axial distance between the centers of the two annular grooves 110. A smaller interval D between any two adjacent annular grooves 110 enhances the capillary effect and the surface tension of the electrolyte, thereby reducing the probability of the electrolyte dripping naturally due to gravity. However, if the interval D between two adjacent annular grooves 110 is too small, it will increase the resistance of the electrolyte as it flows through the injection channel 100. Therefore, in order for the electrolyte to flow smoothly into the battery through the injection channel 100, the interval D between any two adjacent annular grooves 110 should not be too small. For example, the interval D between two adjacent annular grooves 110 is greater than 0.5 mm and less than 1 mm.

[0054] In this embodiment of the application, along the axial direction X of the injection channel 100, the interval D between any two adjacent annular grooves 110 is less than a first preset threshold, which can reduce the probability of electrolyte dripping naturally due to gravity and balance the resistance of electrolyte during the flow process in the injection channel 100.

[0055] Figure 6 A partial magnification of the injection channel in some embodiments of this application. Figure 4 ,like Figure 6 As shown, the tangent L1 of the annular groove 110 forms an angle α with the horizontal line L2, wherein the horizontal line L2 is perpendicular to the axis of the annular groove 110.

[0056] In this embodiment of the application, the tangent L1 of the annular groove 110 forms an angle α with the horizontal line L2. That is, the annular groove 110 is designed with a certain tilt angle. After the liquid injection is completed, due to the tilt design of the annular groove 110, when the liquid injection nozzle 1000 is lifted, the electrolyte is guided to flow back, which prevents the electrolyte from dripping naturally due to gravity.

[0057] In this embodiment, the tangent L1 of the annular groove 110 forms an angle α with the horizontal line L2, which can further reduce the probability that the electrolyte will drip naturally due to gravity after the liquid injection nozzle 1000 is completed.

[0058] According to some embodiments of this application, such as Figure 6 As shown, the angle α is greater than the first preset angle and less than the second preset angle.

[0059] In this embodiment, when the angle α formed by the tangent L1 of the annular groove 110 and the horizontal line L2 is too large, the electrolyte will drip down the annular groove 110 due to gravity. When the angle α formed by the tangent L1 of the annular groove 110 and the horizontal line L2 is too small, the resistance of the annular groove 110 to the electrolyte will increase during the electrolyte injection process at the injection nozzle 1000. In order for the annular groove 110 to both prevent the electrolyte from dripping naturally due to gravity and allow the electrolyte to flow out smoothly during the injection process, the angle α formed by the tangent L1 of the annular groove 110 and the horizontal line L2 can be within a preset range.

[0060] In this embodiment of the application, the first preset degree can be 10 degrees and the second preset degree can be 25 degrees.

[0061] In this embodiment, the angle α formed by the tangent L1 of the annular groove 110 and the horizontal line L2 is greater than the first preset degree and less than the second preset degree. This can both prevent the electrolyte from dripping naturally due to gravity and allow the electrolyte to flow out smoothly during the injection process.

[0062] According to some embodiments of this application, the annular groove 110 is a continuous spiral groove.

[0063] In this embodiment, when the annular groove 110 is spiral-shaped along the axial direction X of the injection channel, and any two adjacent annular grooves 110 are connected end to end, a continuous spiral groove is formed. Figure 7 This is a schematic diagram of a continuous spiral groove according to some embodiments of this application. The continuous spiral structure has no "discontinuities" or "dead zones," which can uniformly and directionally transport the electrolyte along the spiral trajectory, avoiding the electrolyte from stagnating and accumulating in the intermittent grooves.

[0064] In this embodiment, the annular groove 110 is a continuous spiral groove, which can further facilitate the smooth flow of electrolyte during the injection process, and also further simplify the structure of the injection nozzle 1000.

[0065] According to some embodiments of this application, the inner wall of the injection channel 100 is made of superhydrophobic coated stainless steel.

[0066] In this embodiment, the microhardness of the superhydrophobic coated stainless steel can reach a Vickers hardness (HV) of 800-1200, effectively preventing the inner wall of the injection channel 100 from being scratched or corroded by the electrolyte during high-pressure injection, thus avoiding capillary retention failure due to wear or corrosion. The superhydrophobic coated stainless steel also has a self-cleaning effect; when trace amounts of electrolyte return to the surface, the rough structure of the superhydrophobic coated stainless steel surface promotes the automatic detachment of droplets under vibration or airflow, preventing residual electrolyte from crystallizing and clogging the channel. Therefore, the superhydrophobic coated stainless steel, through its triple effects of mechanical strengthening, chemical corrosion protection, and physical hydrophobicity, is a crucial guarantee for the long-term reliability of the injection nozzle 1000. It also enables the injection nozzle 1000 to inject large quantities of liquid efficiently, further reducing the maintenance cost of the injection nozzle 1000.

[0067] According to some embodiments of this application, the diameter of the conical nozzle 400 is smaller than the diameter of the battery's injection hole.

[0068] In this embodiment, since the diameter of the conical nozzle 400 is smaller than the diameter of the battery's liquid filling hole, the conical nozzle 400 needs to be supported when inserted into the liquid filling hole. When the liquid filling nozzle 1000 is located on the battery's liquid filling hole, the end face of the conical nozzle 400 inserted into the liquid filling hole abuts against the end face located inside the liquid filling hole. No additional structures need to be added to the liquid filling nozzle 1000 or the conical nozzle 400 to make the conical nozzle 400 communicate with the liquid filling hole, resulting in a simple structure.

[0069] According to the embodiments of this application, since the diameter of the conical nozzle 400 is smaller than the diameter of the battery's liquid injection hole, when the conical nozzle 400 is inserted into the liquid injection hole, the end face of the conical nozzle 400 abuts against the end face inside the liquid injection hole. Therefore, no other structure needs to be added, and the liquid injection hole can play a supporting role, resulting in a simple structure.

[0070] According to some embodiments of this application, the annular groove 110 is located in the circular tube portion 300 and the conical nozzle portion 400.

[0071] In this embodiment, the injection channel 100 extends from the end center of the annular portion 200 to the end center of the conical nozzle portion 400. The annular groove 110 is located between the circular tube portion 300 and the conical nozzle portion 400, which can reduce the probability of electrolyte accumulation during the injection process.

[0072] A second aspect of the embodiments of this application provides a liquid injection device, including the liquid injection nozzle 1000 in the foregoing embodiments.

[0073] In this embodiment, by providing an annular groove 110 on the inner wall of the injection channel 100 in the injection nozzle 1000, the electrolyte can be prevented from dripping naturally due to gravity after injection, without the addition of additional accessories. This achieves an anti-drip function, improves the cleanliness of the injection environment, increases production capacity, and reduces production line costs. Furthermore, providing an annular groove 110 on the inner wall of the injection channel 100 in the injection nozzle 1000 simplifies the structure of the injection nozzle 1000. Compared to adding auxiliary structures or devices to the injection nozzle 1000 to prevent dripping, this improves its stability and reliability, and significantly reduces manufacturing costs.

[0074] The technical solution of this application will be further described below through a specific embodiment, such as... Figure 1 and Figure 2 As shown,

[0075] The injection nozzle 1000 includes a ring portion 200, a circular tube portion 300, and a conical nozzle portion 400 connected in sequence. The centerlines of the ring portion 200, the circular tube portion 300, and the conical nozzle portion 400 are collinear. The outer diameter of the ring portion 200 is larger than the outer diameter of the circular tube portion 300. The injection channel 100 extends from the inlet end 120 of the ring portion 200 to the outlet end 130 of the conical nozzle portion 400. The diameter of the conical nozzle portion 400 is smaller than the diameter of the battery's injection hole. An annular groove 110 is formed on the inner wall of the injection channel 100, located between the circular tube portion 300 and the conical nozzle portion 400. The inner wall of the injection channel 100 is made of superhydrophobic coated stainless steel.

[0076] There are multiple annular grooves 110, arranged sequentially along the axial direction X of the injection channel 100. The depth H of the annular groove 110 is less than or equal to a preset multiple of the inner diameter R of the injection channel 100, where depth H is the distance from the bottom of the annular groove 110 to the inner surface of the injection channel 100. Along the axial direction X of the injection channel 100, the interval D between any two adjacent annular grooves 110 is less than a first preset threshold. The tangent L1 of the annular groove 110 forms an angle α with the horizontal line L2, where the horizontal line L2 is perpendicular to the axis of the annular groove 110. The degree of the angle α is greater than a first preset degree and less than a second preset degree.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A liquid injection nozzle (1000), characterized in that, include: The injection channel (100), the annular portion (200), the circular tube portion (300), and the conical nozzle portion (400) are sequentially and fixedly connected. The center lines of the annular portion (200), the circular tube portion (300), and the conical nozzle portion (400) are on the same straight line. The outer diameter of the annular portion (200) is larger than the outer diameter of the circular tube portion (300). The injection channel (100) extends from the inlet end (120) of the annular portion (200) to the outlet end (130) of the conical nozzle portion (400). An annular groove (110) is provided on the inner wall of the injection channel (100). There are multiple annular grooves (110), and the multiple annular grooves (110) are arranged sequentially along the axial direction of the injection channel (100).

2. The injection nozzle (1000) according to claim 1, characterized in that, The depth of the annular groove (110) is less than or equal to a preset multiple of the inner diameter of the injection channel (100), wherein the depth is the distance from the bottom of the annular groove (110) to the inner surface of the injection channel (100).

3. The injection nozzle (1000) according to claim 1, characterized in that, The number of annular grooves (110) is multiple, and the interval between any two adjacent annular grooves (110) along the axial direction of the injection channel (100) is less than a first preset threshold.

4. The injection nozzle (1000) according to claim 1, characterized in that, The tangent of the annular groove (110) forms an angle with the horizontal line, wherein the horizontal line is perpendicular to the axis of the annular groove (110).

5. The injection nozzle (1000) according to claim 4, characterized in that, The included angle is greater than a first preset angle and less than a second preset angle.

6. The injection nozzle (1000) according to any one of claims 1 to 5, characterized in that, The annular groove (110) is a continuous spiral groove.

7. The injection nozzle (1000) according to any one of claims 1 to 5, characterized in that, The inner wall of the injection channel (100) is made of superhydrophobic coated stainless steel.

8. The injection nozzle (1000) according to any one of claims 1 to 5, characterized in that, The diameter of the conical nozzle (400) is smaller than the diameter of the battery's injection hole.

9. The injection nozzle (1000) according to any one of claims 1 to 5, characterized in that, The annular groove (110) is located on the circular tube portion (300) and the conical nozzle portion (400).

10. A liquid injection device, characterized in that, Includes the injection nozzle (1000) as described in any one of claims 1 to 9.

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