Battery liquid injection nozzle, battery liquid injection device and battery production system
By setting a storage tank at the injection end of the battery injection nozzle, the problem of electrolyte dripping or leakage is solved, and pollution control in the battery production process is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-24
AI Technical Summary
During battery production, when the electrolyte injection nozzle separates from the battery cell, the electrolyte can easily drip or leak, causing contamination of the injection hole or the surface of the battery cell.
Design a battery electrolyte filling nozzle with a reservoir surrounding the filling port on the end face of the filling end to buffer residual electrolyte and reduce dripping or leakage.
It effectively buffers and improves the risk of electrolyte dripping or leaking into the battery cells, reducing contamination of the injection holes or the surface of the battery cells.
Smart Images
Figure CN224554666U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery liquid filling technology, and in particular to a battery liquid filling nozzle, a battery liquid filling device, and a battery production system. Background Technology
[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.
[0003] Batteries are typically composed of multiple individual cells. During battery production, electrolyte needs to be injected into each cell. However, when the injection is completed and the injection nozzle of the injection device leaves the injection hole of the cell, electrolyte may drip or leak, causing contamination of the injection hole or the surface of the cell. Utility Model Content
[0004] In view of the problem, this application provides a battery filling nozzle, a battery filling device, and a battery production system, which can alleviate the problem that electrolyte dripping or leakage occurs the instant the filling nozzle leaves the filling hole of the battery cell, resulting in contamination of the filling hole or the surface of the battery cell.
[0005] In a first aspect, this application provides a battery filling nozzle for injecting electrolyte into the filling hole of a battery cell. The battery filling nozzle includes:
[0006] The main body has a liquid injection channel and a liquid injection end. The end face of the liquid injection end is provided with a liquid injection port that communicates with the liquid injection channel.
[0007] The injection end is also equipped with a liquid storage tank, which surrounds the injection port.
[0008] When the injection end of the aforementioned battery injection nozzle abuts against the surface of the battery cell with the injection hole, so that the injection port corresponds to the injection hole, the electrolyte can flow through the injection channel and injection port to the injection hole, thereby injecting electrolyte into the battery cell. When the injection action is completed, during the separation process between the battery injection nozzle and the battery cell, the electrolyte remaining in the injection channel will flow to the end face of the injection end. Since the end face is provided with a reservoir surrounding the injection port, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell and reducing contamination of the injection hole or the surface of the battery cell.
[0009] In some embodiments, when the battery injection nozzle injects liquid into the injection hole of the battery cell, the injection end extends into the injection hole.
[0010] Alternatively, the direct projection of the liquid injection port and the liquid storage tank toward the battery cell falls into the liquid injection hole.
[0011] When the injection end extends into the injection hole, both the injection port and the storage tank on the end face of the injection end can be located within the injection hole. Alternatively, when the orthogonal projection of the injection port and the storage tank toward the battery cell falls into the injection hole, on the one hand, during the injection process of the battery cell, since the injection process mostly uses alternating positive and negative pressure, the storage tank can serve as a transfer station for the electrolyte, allowing it to flow out to the injection hole or back to the injection channel via the injection port. On the other hand, when the injection action is completed and the battery injection nozzle separates from the battery cell, if there is a large amount of electrolyte remaining in the injection channel that cannot be completely buffered by the storage tank, some electrolyte can drip down into the injection hole below under gravity, thereby reducing contamination on the surface of the battery cell.
[0012] In some embodiments, a portion of the end face of the injection end is configured as an abutment surface, which surrounds the liquid storage tank and fits against the outer peripheral wall of the injection hole when the injection end mates with the injection hole.
[0013] When the filling end of the battery filling nozzle comes into contact with the surface of the battery cell with the filling hole, the outer periphery of the reservoir is in contact with the outer periphery of the filling hole through the contact surface. Therefore, the filling port and the filling hole can fit more closely and form a seal on the outer periphery of the filling port, reducing the leakage of electrolyte during the filling process.
[0014] In some embodiments, the liquid storage tank is arranged in a complete circle around the liquid injection port;
[0015] Alternatively, the liquid storage tank may include multiple sub-liquid storage tanks, all of which are arranged around the injection port at intervals.
[0016] When the electrolyte reservoir is arranged in a complete circle around the injection port, it can buffer the electrolyte flowing out of the injection port from all directions, further reducing the risk of electrolyte dripping or leaking onto the surface of the battery cells and minimizing contamination of the injection port or the surface of the battery cells. When the electrolyte reservoir includes multiple sub-reservoirs, each sub-reservoir can buffer a portion of the electrolyte, improving the reliability of the buffering.
[0017] In some embodiments, the number of liquid storage tanks includes a plurality of tanks, each tank being arranged around the injection port, and all tanks being spaced apart from each other in the radial direction of the injection port.
[0018] By arranging multiple electrolyte reservoirs spaced apart along the radial direction of the injection port, the buffer space can be increased by increasing the number of reservoirs. On the other hand, the residual electrolyte in each reservoir can be minimized, thereby reducing the phenomenon of electrolyte dripping due to inertia at different moving speeds of the battery injection nozzle.
[0019] In some embodiments, the width of the liquid storage tank is 0.05 mm to 0.1 mm, and the depth of the liquid storage tank is 0.1 mm to 3 mm.
[0020] When the width of the electrolyte storage tank is 0.05 mm to 0.1 mm and the depth of the electrolyte storage tank is 0.1 mm to 3 mm, the electrolyte storage tank has a small size. Therefore, when the electrolyte enters the electrolyte storage tank, the electrolyte in the storage tank will continue to be bound and adhered to the storage tank under the action of surface preparation, thereby reducing the risk of electrolyte detaching from the storage tank and flowing to the surface of the battery cell, causing pollution.
[0021] In some embodiments, the inner radial direction of the injection channel tends to decrease towards the injection port.
[0022] By setting the inner radial direction of the injection channel to be smaller towards the injection port, the flow rate of the injection channel continuously increases during the injection process, thereby improving the injection efficiency.
[0023] In some embodiments, the injection channel includes multiple sub-injection channels, which are connected sequentially along the direction close to the injection port, and the inner diameter of each sub-injection channel gradually decreases.
[0024] In this way, a step can be formed between two adjacent sub-injection channels. This step can buffer the electrolyte during the injection process and increase the difficulty of electrolyte flowing back from the injection port to the injection channel.
[0025] In some embodiments, the battery filling nozzle further includes a suction member, which is detachably disposed at the filling end of the body and is used to draw electrolyte from the storage tank.
[0026] And / or the battery filling nozzle also includes a sealing element, which is detachably disposed at the filling end of the body and is used to seal the reservoir and the filling port.
[0027] In the continuous production process of battery cells, the electrolyte stored in the reservoir flows back to the next battery cell. However, when battery cell production is intermittent or the electrolyte filling process is stopped, the electrolyte in the reservoir is exposed to air for a long time and is prone to crystallization. Crystallization affects the contact seal between the battery filling nozzle and the filling hole. Frequent replacement of the battery filling nozzle will affect the production cycle. Therefore, in this embodiment, by setting a suction component that is detachable from the main body, on the one hand, it can be removed from the main body when the battery filling nozzle is filling the battery cell, so as not to affect the filling process. On the other hand, it can be installed on the filling end of the main body when battery cell production is intermittent or the electrolyte filling process is stopped to suck up the electrolyte in the reservoir, thereby reducing the possibility of electrolyte crystallization due to long-term exposure to air. Furthermore, the sucked-up electrolyte can be recycled and reused, improving the utilization rate of the electrolyte and reducing the impact of battery cell production cycle on the replacement of the battery filling nozzle.
[0028] Because the electrolyte in the storage tank is exposed to air for a long time during the intermittent production of battery cells or when the electrolyte filling process is stopped, it is prone to crystallization. Crystallization affects the contact seal between the battery filling nozzle and the filling hole. Therefore, by sealing the storage tank and the filling port with a sealing component, the storage tank and the filling port can be isolated from the outside world, thereby reducing the possibility of electrolyte crystallization due to long-term exposure to air, and also reducing the impact on the production cycle of battery cells due to the replacement of battery filling nozzles.
[0029] Secondly, a battery liquid injection device is provided, including the battery liquid injection nozzle in any of the above embodiments.
[0030] In the aforementioned battery electrolyte filling device, when the electrolyte filling end of the battery filling nozzle body abuts against the surface of the battery cell with the electrolyte filling hole, so that the electrolyte filling port corresponds to the electrolyte filling hole, the electrolyte can flow through the electrolyte filling channel and the electrolyte filling port to the electrolyte filling hole, thereby realizing the electrolyte filling of the battery cell. When the electrolyte filling action is completed, during the separation process between the battery filling nozzle and the battery cell, the electrolyte remaining in the electrolyte filling channel will flow to the end face of the filling end. Since the end face is provided with a liquid storage tank surrounding the electrolyte filling port, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell and reducing the contamination of the electrolyte filling hole or the surface of the battery cell.
[0031] Thirdly, a battery production system is also provided, including the battery filling nozzle in any of the above embodiments.
[0032] In the aforementioned battery production system, when the injection end of the battery injection nozzle body abuts against the surface of the battery cell with the injection hole, so that the injection port corresponds to the injection hole, the electrolyte can flow through the injection channel and injection port to the injection hole, thereby realizing the injection of electrolyte into the battery cell. When the injection action is completed, during the separation process between the battery injection nozzle and the battery cell, the electrolyte remaining in the injection channel will flow to the end face of the injection end. Since the end face is provided with a reservoir surrounding the injection port, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell and reducing contamination of the injection hole or the surface of the battery cell.
[0033] 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
[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0035] Figure 1 This is a schematic diagram of the structure of a battery filling nozzle according to one or more embodiments.
[0036] Figure 2 for Figure 1 A partially enlarged schematic diagram of the battery filling nozzle.
[0037] Figure 3 for Figure 1 The diagram shows a half-section of the battery filling nozzle.
[0038] Figure 4 To be implemented according to one or more embodiments Figure 1 The diagram shows a half-section of the battery injection nozzle applied to a single battery cell.
[0039] Figure 5 for Figure 4 The diagram shows an enlarged view of part A.
[0040] Figure 6 This is a schematic diagram of the structure of a battery filling nozzle according to one or more other embodiments.
[0041] Figure 7 This is a schematic diagram of the structure of a battery filling nozzle according to one or more embodiments.
[0042] Figure 8This is a schematic diagram of the structure of a battery filling nozzle according to one or more embodiments.
[0043] Figure 9 for Figure 8 A partially enlarged schematic diagram of the battery filling nozzle.
[0044] Figure 10 for Figure 3 A partial cross-sectional diagram of the battery filling nozzle is shown.
[0045] The reference numerals in the detailed embodiments are as follows:
[0046] Battery filling nozzle 100, body 10, filling channel 11, sub-filling channel 111, filling end 12, filling port 121, storage tank 122, sub-storage tank 1221, contact surface 123, annular inclined surface 13, battery cell 200, filling hole 210. Detailed Implementation
[0047] 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.
[0048] 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.
[0049] 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.
[0050] 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.
[0051] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.
[0052] 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).
[0053] 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.
[0054] 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.
[0055] In the actual process of adding electrolyte to a battery cell, an injection device is usually used to inject electrolyte into the battery cell. The injection device includes an injection nozzle, which is placed against the injection hole at the top of the battery cell to inject electrolyte.
[0056] To ensure better control over electrolyte flow and quality, the electrolyte injection process mostly employs alternating positive and negative pressure. The injection device uses differential pressure injection technology to first pump the internal pressure of the battery cell to a high negative pressure state of -70 kPa to -98 kPa. Then, a metered amount of electrolyte is injected into the injection cup, automatically drawing the electrolyte into the battery cell using the pressure difference between the inside and outside. To ensure better electrolyte absorption, the injection pressure is further increased to a positive pressure of 200 kPa to 400 kPa. This high-pressure condition promotes the penetration of electrolyte molecules into the electrode plates of the electrode assembly within the battery cell. This process is repeated multiple times under alternating positive and negative pressure conditions to complete the electrolyte injection operation.
[0057] Typically, to ensure the electrical performance of individual battery cells, a relatively large amount of electrolyte is added. During the entire filling process, the electrolyte continuously or intermittently flows through the inner wall of the filling pipe or nozzle. Furthermore, when the electrolyte filling is complete, the battery cell must be kept at normal or slightly negative pressure. This is because if the battery cell is under positive pressure at the end of filling, the electrolyte remaining in the pipe will be blown onto the surface of the battery cell when the nozzle separates from it, resulting in extensive surface contamination. If the battery cell is under high negative pressure at the end of filling, separation between the nozzle and the battery cell becomes difficult, and when the nozzle separates from the battery cell, high-pressure gas rapidly enters the nozzle, causing the residual electrolyte on the inner wall of the nozzle to be dispersed, and even severe splashing may occur.
[0058] Therefore, it is best to keep the battery cell under normal pressure or slightly positive pressure at the end of the electrolyte filling process. However, normal pressure or slightly negative pressure conditions will result in a lot of residual electrolyte on the inner wall of the electrolyte filling channel and the filling nozzle. As a result, when the filling nozzle is separated from the battery cell, electrolyte dripping or leakage will occur, causing contamination of the filling hole or the surface of the battery cell.
[0059] The electrolyte residue on the surface of the battery cell will crystallize into particles, which will cause various abnormalities such as bumps or bubbles in the insulating blue film covering the battery cell. In addition, the electrolyte residue crystallization in the injection hole will also affect the welding process of the sealing nail, causing poor welding such as bursting of the sealing nail.
[0060] To alleviate the problem of electrolyte dripping or leakage when the filling nozzle is separated from the battery cell, which could lead to contamination of the filling hole or the surface of the battery cell, this application designs a battery filling nozzle for injecting electrolyte into the filling hole of the battery cell. The battery filling nozzle includes a body with a filling channel and a filling end. The end face of the filling end is provided with a filling port communicating with the filling channel. The end face of the filling end is also provided with a liquid storage tank, which surrounds the filling port.
[0061] When the electrolyte filling end of the battery filling nozzle body abuts against the surface of the battery cell with the filling hole, so that the filling port corresponds to the filling hole, the electrolyte can flow through the filling channel and the filling port to the filling hole, thereby realizing the filling of the battery cell. When the filling action is completed, during the separation process of the battery filling nozzle and the battery cell, the electrolyte remaining in the filling channel will flow to the end face of the filling end. Since the end face is provided with a reservoir surrounding the filling port, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell and reducing the contamination of the filling hole or the surface of the battery cell.
[0062] The battery filling nozzle of this application is used in a battery filling device to alleviate the problem of electrolyte dripping or leakage when the filling nozzle is separated from the battery cell, which leads to contamination of the filling hole or the surface of the battery cell.
[0063] The battery electrolyte injection device disclosed in this application can be used in a battery production system. The battery production system may include a slurry preparation device, a coating device, a rolling device, a die-cutting device, a winding or stacking device, a casing device, and a battery electrolyte injection device, etc.
[0064] The system includes the following components: a slurry preparation device for mixing materials for preparing positive electrode active materials to form a positive electrode active material slurry, and a coating device for coating the active material slurry onto the current collector substrate. Specifically, the positive electrode active material slurry is coated onto the positive electrode current collector substrate, and the negative electrode active material slurry is coated onto the negative electrode current collector substrate. A rolling device rolls the coated current collector substrate to form a more compact and uniform bond between the active material coated on the current collector substrate, thereby increasing the compaction density of the electrode sheet and improving the battery energy density. A die-cutting device cuts the current collector after rolling and forms conductive tabs connecting the positive and negative electrodes, thus obtaining the positive and negative electrode sheets. A winding or stacking device combines the positive electrode sheet, negative electrode sheet, and separator together in a winding or stacking manner to form an electrode assembly. The casing assembly is used to fit the electrode assembly into the casing, ensuring physical compatibility and sealing between the electrode assembly and the casing. The electrolyte filling assembly is used to inject electrolyte into the casing.
[0065] See appendix Figures 1-5 This application provides a battery injection nozzle 100 for injecting liquid into the injection hole 210 of a battery cell 200. The battery injection nozzle 100 includes a body 10, which has an injection channel 11 and an injection end 12. The end face of the injection end 12 is provided with an injection port 121 communicating with the injection channel 11. The end face of the injection end 12 is also provided with a liquid storage tank 122, which surrounds the injection port 121.
[0066] The battery filling nozzle 100 is used to inject electrolyte into the filling hole 210 of the battery cell 200.
[0067] The body 10 refers to the main part of the battery filling nozzle 100 that has the function of filling. The battery filling nozzle 100 may include only the body 10, or it may include other components besides the body 10, such as seals.
[0068] The electrolyte injection channel 11 is a flow channel for electrolyte. The electrolyte injection channel 11 should be connected to an external chamber that contains electrolyte, for example, to an external electrolyte injection cup.
[0069] The injection end 12 refers to the end face that contacts the outer peripheral wall of the injection hole 210 of the battery cell 200. When the injection end 12 contacts the outer peripheral wall of the injection hole 210 of the battery cell 200, the battery injection nozzle 100 can be positioned relative to the battery cell 200, so that the injection port 121 on the end face of the injection end 12 corresponds to the position of the injection hole 210 of the battery cell 200.
[0070] The liquid storage tank 122 refers to a tank structure capable of storing liquids. Specifically, the liquid storage tank 122 can be formed by an inward recess from the end face of the liquid injection end 12.
[0071] When the injection end 12 of the body 10 of the battery injection nozzle 100 abuts against the surface of the battery cell 200 with the injection hole 210, so that the injection port 121 corresponds to the injection hole 210, the electrolyte can flow through the injection channel 11 and the injection port 121 to the injection hole 210, thereby realizing the injection of electrolyte into the battery cell 200. When the injection action is completed, during the separation process between the battery injection nozzle 100 and the battery cell 200, the electrolyte remaining in the injection channel 11 will flow to the end face of the injection end 12. Since the end face is provided with a reservoir 122 surrounding the injection port 121, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell 200 and reducing the contamination of the injection hole 210 or the surface of the battery cell 200.
[0072] According to some embodiments of this application, when the battery injection nozzle 100 injects liquid into the injection hole 210 of the battery cell 200, the injection end 12 extends into the injection hole 210.
[0073] When the injection end 12 extends into the injection hole 210, the injection port 121 and the storage tank 122 on the end face of the injection end 12 can both be located within the injection hole 210. On the one hand, during the injection process of the battery cell 200, since the injection process mostly uses alternating positive and negative pressure, the storage tank 122 can serve as a transfer station for the electrolyte, allowing it to flow out to the injection hole 210 or back to the injection channel 11 via the injection port 121. On the other hand, when the injection action is completed and the battery injection nozzle 100 separates from the battery cell 200, if there is a large amount of electrolyte remaining in the injection channel 11 that cannot be completely buffered by the storage tank 122, some electrolyte can drip down into the injection hole 210 below under gravity, thereby reducing contamination on the surface of the battery cell 200.
[0074] In another embodiment of this application, when the battery injection nozzle 100 injects liquid into the injection hole 210 of the battery cell 200, the orthogonal projection of the injection port 121 and the reservoir 122 toward the battery cell 200 falls into the injection hole 210.
[0075] The orthographic projection of the injection port 121 and the reservoir 122 toward the battery cell 200 refers to the projection of the injection port 121 and the reservoir 122 toward the battery cell 200 in a direction perpendicular to the battery cell 200. In the embodiments of this application, it specifically refers to the projection of the injection port 121 and the reservoir 122 toward the top surface of the battery cell 200 in a vertical direction.
[0076] When the projection of the injection port 121 and the storage tank 122 toward the battery cell 200 falls into the injection hole 210, on the one hand, during the injection process of the battery cell 200, since the injection process mostly uses alternating positive and negative pressure, the storage tank 122 can serve as a transfer station for the electrolyte, allowing it to flow out to the injection hole 210 or back to the injection channel 11 via the injection port 121. On the other hand, when the injection action is completed and the battery injection nozzle 100 separates from the battery cell 200, if there is a large amount of electrolyte remaining in the injection channel 11 that cannot be completely buffered by the storage tank 122, some of the electrolyte can drip into the injection hole 210 below under the action of gravity, thereby reducing the contamination of the surface of the battery cell 200.
[0077] According to some embodiments of this application, a portion of the end face of the injection end 12 is configured as an abutment surface 123. The abutment surface 123 is arranged around the liquid storage tank 122. When the injection end 12 mates with the injection hole 210, the abutment surface 123 is in contact with the outer peripheral wall of the injection hole 210.
[0078] The contact surface 123 refers to the surface that can form a contact relationship with an external component. Specifically, the contact surface 123 may be arranged in a complete circle around the liquid storage tank 122, or it may not be arranged in a complete circle around the liquid storage tank 122.
[0079] When the injection end 12 of the body 10 of the battery injection nozzle 100 abuts against the surface of the battery cell 200 with the injection hole 210, the outer periphery of the reservoir 122 is in contact with the outer periphery of the injection hole 210 through the contact surface 123. Therefore, the injection port 121 and the injection hole 210 can fit more closely, and a seal is formed on the outer periphery of the injection port 121, reducing the leakage of electrolyte during the injection process.
[0080] Furthermore, the body 10 also has an annular inclined surface 13, which surrounds the injection end 12. One end of the annular inclined surface 13 is connected to the abutment surface 123, and the other end of the annular inclined surface 13 extends toward the end of the body 10 opposite to the injection end 12. The included angle between the annular inclined surface 13 and the abutment surface 123 is greater than 90 degrees.
[0081] Since the position of the liquid injection hole 210 of the battery cell 200 is usually located in the countersunk hole provided on the top surface of the battery cell 200, the annular inclined surface 13 is provided. On the one hand, it is beneficial to guide the battery liquid injection nozzle 100 into the countersunk hole and correctly align it with the position of the liquid injection hole 210. On the other hand, it can also guide the electrolyte to flow to the liquid injection end 12 of the body 10 in the event of electrolyte leakage, and then be buffered by the liquid storage tank 122 or flow into the liquid injection hole 210, thereby reducing the contamination of the liquid injection hole 210 or the surface of the battery cell 200.
[0082] See Figure 6 According to some embodiments of this application, the liquid storage tank 122 is arranged in a complete circle around the liquid injection port 121.
[0083] When the electrolyte storage tank 122 is arranged in a complete circle around the injection port 121, the electrolyte storage tank 122 can buffer the electrolyte flowing out of the injection port 121 in all directions, further reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell 200, and reducing the contamination of the injection hole 210 or the surface of the battery cell 200.
[0084] See Figure 7 In other embodiments, the liquid storage tank 122 includes a plurality of sub-liquid storage tanks 1221, all of which are arranged at intervals around the liquid injection port 121.
[0085] When the liquid storage tank 122 includes multiple sub-liquid storage tanks 1221, each sub-liquid storage tank 1221 can buffer a portion of the electrolyte, thus improving the reliability of the buffering.
[0086] See Figure 8 and Figure 9 According to some embodiments of this application, the number of liquid storage tanks 122 includes a plurality of tanks, each liquid storage tank 122 is arranged around the injection port 121, and all liquid storage tanks 122 are spaced apart from each other along the radial direction of the injection port 121.
[0087] By arranging multiple electrolyte storage tanks 122 at intervals along the radial direction of the injection port 121, the buffer space can be increased by increasing the number of electrolyte storage tanks 122. On the other hand, the residual amount of electrolyte in each electrolyte storage tank 122 can be minimized, thereby reducing the phenomenon of electrolyte dripping due to inertia when the battery injection nozzle 100 moves at different speeds.
[0088] Specifically, at least one of the liquid storage tanks 122 is arranged in a complete circle around the liquid injection port 121, and at least another liquid storage tank 122 includes a plurality of sub-liquid storage tanks 1221, all of which are arranged at intervals around the liquid injection port 121.
[0089] Optionally, there are two liquid storage tanks 122, namely a first liquid storage tank and a second liquid storage tank. The first liquid storage tank is arranged in a complete circle around the liquid injection port 121, and the second liquid storage tank includes multiple sub-liquid storage tanks 1221, all of which are arranged around the first liquid storage tank at intervals.
[0090] Optionally, there are two liquid storage tanks 122, namely a third liquid storage tank and a fourth liquid storage tank. The third liquid storage tank is arranged in a complete circle around the liquid injection port 121, and the fourth liquid storage tank is arranged in a complete circle around the third liquid storage tank.
[0091] Optionally, the distance between any two adjacent liquid storage tanks 122 along the radial direction of the injection port 121 is equal. In other embodiments, the distance between any two connected liquid storage tanks 122 along the radial direction of the injection port 121 may also be unequal.
[0092] See Figure 10 According to some embodiments of this application, the width L of the liquid storage tank 122 is 0.05 mm to 0.1 mm; the depth H of the liquid storage tank 122 is 0.1 mm to 3 mm.
[0093] The width L of the storage tank 122 refers to the internal dimension of the storage tank 122 along the radial direction of the injection port 121.
[0094] When the width L of the storage tank 122 is 0.05 mm to 0.1 mm and the depth H of the storage tank 122 is 0.1 mm to 3 mm, the storage tank 122 has a small size. Therefore, when the electrolyte enters the storage tank 122, the electrolyte in the storage tank 122 will continue to be bound and adhered to the storage tank 122 under the action of surface finishing, thereby reducing the risk of electrolyte detaching from the storage tank 122 and flowing to the surface of the battery cell 200, causing pollution.
[0095] It should be understood that the specific dimensions of the electrolyte storage tank 122 can be selected based on the dimensions of the electrolyte injection hole 210 of the battery cell 200 and the amount of electrolyte injected.
[0096] Please refer to it again. Figure 3 According to some embodiments of this application, the inner radial direction of the injection channel 11 tends to decrease towards the injection port 121.
[0097] The statement that the inner radial direction of the injection channel 11 tends to decrease towards the injection port 121 means that the inner radial direction of the injection channel 11 tends to decrease towards the injection port 121.
[0098] By setting the inner radial direction of the injection channel 11 to be smaller towards the injection port 121, the flow rate of the injection channel 11 during the injection process is continuously increased, thereby improving the injection efficiency.
[0099] Specifically, the injection channel 11 includes multiple sub-injection channels 111, which are connected in sequence along the direction close to the injection port 121, and the inner diameter of each sub-injection channel 111 gradually decreases.
[0100] In this way, a step can be formed between two adjacent sub-injection channels 111. This step can buffer the electrolyte during the injection process and increase the difficulty of electrolyte flowing back from the injection port 121 to the injection channel 111.
[0101] Optionally, the sub-injection channel 111 includes three sub-injection channels 111 connected in sequence along the direction close to the injection port 121, and the inner diameter of each sub-injection channel 111 gradually decreases.
[0102] According to some embodiments of this application, the battery filling nozzle 100 further includes a suction member, which is detachably disposed on the filling end 12 of the body 10 and is used to suction electrolyte in the storage tank 122.
[0103] During the continuous production of battery cell 200, the electrolyte stored in the storage tank 122 will flow back into the next battery cell 200. However, when the production of battery cell 200 is intermittent or the electrolyte filling process is stopped, the electrolyte on the storage tank 122 will be exposed to the air for a long time and is prone to crystallization. Crystallization affects the contact sealing between the battery filling nozzle 100 and the filling hole 210. If the battery filling nozzle 100 is frequently replaced, it will affect the production cycle. Therefore, in this embodiment of the application, by providing a detachable suction member relative to the main body 10, on the one hand, it can be detached from the main body 10 when the battery injection nozzle 100 injects electrolyte into the battery cell 200, so as not to affect the injection process. On the other hand, it can be installed on the injection end 12 of the main body 10 when the battery cell 200 is in intermittently produced or the injection process is stopped, so as to draw electrolyte from the storage tank 122, thereby reducing the possibility of electrolyte crystallization when exposed to air for a long time. In addition, the drawn-out electrolyte can be recycled and reused, improving the utilization rate of electrolyte and reducing the impact on the production cycle of the battery cell 200 due to the replacement of the battery injection nozzle 100.
[0104] Specifically, the suction device may include a suction nozzle capable of suctioning electrolyte from a reservoir. The suction device may also include a receiving cavity communicating with the suction nozzle for accommodating the suction nozzle.
[0105] According to some embodiments of this application, the battery filling nozzle 100 further includes a sealing member, which is detachably disposed on the filling end 12 of the body 10. The sealing member is used to block the liquid storage tank 122 and the filling port 121.
[0106] Since the electrolyte in the storage tank 122 is exposed to the air for a long time and is prone to crystallization when the battery cell 200 is intermittently produced or when the electrolyte filling process is stopped, the crystallization affects the contact sealing between the battery filling nozzle 100 and the filling hole 210. Therefore, by sealing the storage tank 122 and the filling hole 121 with a sealing component, the storage tank 122 and the filling hole 121 can be isolated from the outside world, thereby reducing the situation where the electrolyte is exposed to the air for a long time and is prone to crystallization. It also reduces the impact on the production cycle of the battery cell 200 due to the replacement of the battery filling nozzle 100.
[0107] Specifically, the sealing element can be a sealing plug, which can be made of an elastic material to be elastically embedded in the injection end 12 of the body 10 from the injection port 121.
[0108] According to some embodiments of this application, this application also provides a battery liquid injection device, including the battery liquid injection nozzle 100 in any of the above embodiments.
[0109] When the injection end 12 of the body 10 of the battery injection nozzle 100 abuts against the surface of the battery cell 200 with the injection hole 210, so that the injection port 121 corresponds to the injection hole 210, the electrolyte can flow through the injection channel 11 and the injection port 121 to the injection hole 210, thereby realizing the injection of electrolyte into the battery cell 200. When the injection action is completed, during the separation process between the battery injection nozzle 100 and the battery cell 200, the electrolyte remaining in the injection channel 11 will flow to the end face of the injection end 12. Since the end face is provided with a reservoir 122 surrounding the injection port 121, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell 200 and reducing the contamination of the injection hole 210 or the surface of the battery cell 200.
[0110] Specifically, the battery liquid filling device may also include a liquid inlet mechanism, a liquid filling mechanism, a vacuum mechanism, etc., wherein the liquid filling mechanism includes a battery liquid filling nozzle 100.
[0111] The liquid inlet mechanism is used to supply electrolyte to the liquid injection mechanism. The liquid inlet mechanism may include a liquid storage pipe, a liquid inlet pipe, a flow meter, a liquid inlet valve, etc.
[0112] The electrolyte injection mechanism is used to inject electrolyte into the electrolyte injection port 210 of the battery cell 200. In addition to the battery injection nozzle 100 in any of the above embodiments, the electrolyte injection mechanism may also include an injection cup, an outlet valve, etc.
[0113] The vacuum mechanism is used to provide a vacuum environment for the battery cell 20. The vacuum mechanism may include a vacuum pump, a vacuum valve, a vacuum gauge, a venting valve, etc.
[0114] According to some embodiments of this application, this application also provides a battery production system, including the above-described battery electrolyte injection device.
[0115] When the injection end 12 of the body 10 of the battery injection nozzle 100 abuts against the surface of the battery cell 200 with the injection hole 210, so that the injection port 121 corresponds to the injection hole 210, the electrolyte can flow through the injection channel 11 and the injection port 121 to the injection hole 210, thereby realizing the injection of electrolyte into the battery cell 200. When the injection action is completed, during the separation process between the battery injection nozzle 100 and the battery cell 200, the electrolyte remaining in the injection channel 11 will flow to the end face of the injection end 12. Since the end face is provided with a reservoir 122 surrounding the injection port 121, the electrolyte can be buffered, thereby reducing the risk of electrolyte dripping or leaking onto the surface of the battery cell 200 and reducing the contamination of the injection hole 210 or the surface of the battery cell 200.
[0116] 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 battery filling nozzle for injecting electrolyte into the filling hole of a battery cell, characterized in that, The battery filling nozzle includes: The body has a liquid injection channel, and the body also has a liquid injection end, the end face of which is provided with a liquid injection port communicating with the liquid injection channel; The injection end is further provided with a liquid storage tank, which is arranged around the injection port.
2. The battery filling nozzle according to claim 1, characterized in that, When the battery injection nozzle injects electrolyte into the injection hole of the battery cell, the injection end extends into the injection hole; or The liquid injection port and the liquid storage tank are projected onto the battery cell and fall into the liquid injection hole.
3. The battery filling nozzle according to claim 1 or 2, characterized in that, A portion of the end face of the injection end is configured as an abutment surface, and the abutment surface is arranged around the liquid storage tank; Wherein, the contact surface is in contact with the outer peripheral wall of the injection hole when the injection end mates with the injection hole.
4. The battery filling nozzle according to claim 1 or 2, characterized in that, The liquid storage tank is arranged in a complete circle around the liquid injection port; or The liquid storage tank includes multiple sub-liquid storage tanks, all of which are arranged at intervals around the liquid injection port.
5. The battery filling nozzle according to claim 1 or 2, characterized in that, The number of liquid storage tanks includes multiple tanks, each of which is arranged around the injection port, and all the liquid storage tanks are spaced apart from each other in the radial direction of the injection port.
6. The battery filling nozzle according to claim 1 or 2, characterized in that, The width of the liquid storage tank is 0.05 mm to 0.1 mm; the depth of the liquid storage tank is 0.1 mm to 3 mm.
7. The battery filling nozzle according to claim 1 or 2, characterized in that, The inner radial direction of the injection channel tends to decrease towards the injection port.
8. The battery filling nozzle according to claim 7, characterized in that, The injection channel includes multiple sub-injection channels, which are connected sequentially along the direction close to the injection port, and the inner diameter of each sub-injection channel gradually decreases.
9. The battery filling nozzle according to claim 1 or 2, characterized in that, The battery filling nozzle also includes a suction member, which is detachably disposed at the filling end of the body and is used to suction the electrolyte in the storage tank. and / or The battery filling nozzle also includes a sealing component, which is detachably disposed at the filling end of the body and is used to seal the liquid storage tank and the filling port.
10. A battery electrolyte filling device, characterized in that, Includes the battery filling nozzle as described in any one of claims 1 to 9.
11. A battery production system, characterized in that, Includes the battery electrolyte filling device as described in claim 10.