Battery liquid injection device and method

Abstract

The application provides a battery liquid injection device and a liquid injection method, and relates to the technical field of batteries. The battery liquid injection device comprises a controller, a vacuum extraction structure, a top pressing structure and a hollow liquid injection body electrically connected with the controller. The liquid outlet of the liquid injection body is in communication with the battery liquid injection hole. The top pressing structure is coaxially and sealingly arranged in the liquid injection body, and the outer wall of the top pressing structure is arranged at intervals with the inner wall of the liquid injection body. The vacuum extraction structure is in communication with the inner cavity of the liquid injection body. When the liquid outlet and the liquid injection hole are coaxial and in communication, the controller drives the top pressing structure to move towards the direction close to the battery to open the adhesive tape to the preset position. After the top pressing structure opens the adhesive tape to the preset position, the controller drives the vacuum extraction structure to work, and drives the liquid injection body to work when the vacuum degree in the battery is less than the preset value, so that the electrolyte is injected into the battery. The adhesive tape is prevented from blocking the liquid injection hole, the electrolyte flows smoothly, the battery liquid injection amount is ensured, the liquid injection time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery electrolyte filling device and method. Background Technology

[0002] The electrolyte filling process is a core step in the manufacturing of square lithium-ion batteries. During filling, a vacuum is first created inside the battery casing to form a negative pressure environment. Then, using the pressure difference between the inside and outside of the casing, the electrolyte is injected into the casing through the filling nozzle and the filling holes on the casing cover.

[0003] In related technologies, after battery assembly, adhesive tape for insulation and shielding solder marks is attached to the surface of the adapter plate inside the cover. However, during the vacuuming process inside the casing in the electrolyte injection step, the adhesive tape on the adapter plate is easily sucked upwards under negative pressure and sticks tightly to the back of the electrolyte injection hole, causing blockage of the injection hole and poor electrolyte inflow. This not only leads to insufficient electrolyte injection, affecting the battery's electrochemical performance and cycle life, and reducing yield, but also prolongs the electrolyte injection time and reduces production efficiency. Summary of the Invention

[0004] This application provides a battery electrolyte filling device and method to solve the problem that the adhesive tape on the adapter plate easily sticks to the back of the filling hole during the electrolyte filling process, causing blockage of the filling hole and hindering the smooth flow of electrolyte. This ensures sufficient electrolyte filling and improves battery yield. Furthermore, it shortens the filling time and improves production efficiency while maintaining the same electrolyte volume.

[0005] In a first aspect, this application provides a battery electrolyte filling device, wherein the battery has an electrolyte filling hole. The battery electrolyte filling device includes a controller and a vacuuming structure, a support structure, and a hollow filling body electrically connected to the controller. The filling body has an inlet and an outlet, the inlet being for communication with an electrolyte storage device, and the outlet being for communication with the electrolyte filling hole; the support structure is sealed and inserted into the filling body and is coaxially arranged with the outlet, the outer wall of the support structure being spaced apart from the inner wall of the filling body; the vacuuming structure is in communication with the inner cavity of the filling body. The controller is used to drive the support structure to move toward the direction closer to the battery when the outlet and the filling hole are coaxial and in communication, sequentially passing through the outlet and the filling hole, and pushing the adhesive tape located on the back side of the filling hole to a preset position. The controller is used to drive the vacuuming structure to work after the top structure pushes the adhesive paper to the preset position; and when the vacuum degree in the battery is less than the preset value, it drives the liquid injection body to work so as to inject the electrolyte into the battery through the liquid inlet, the inner cavity of the liquid injection body, the liquid outlet, and the liquid injection hole.

[0006] The battery electrolyte filling device provided in this application includes a sealing and penetrating abutment structure within the electrolyte filling body. This abutment structure is coaxially aligned with the outlet of the electrolyte filling body, and its outer wall is spaced apart from the inner wall of the electrolyte filling body, forming an annular electrolyte filling channel for electrolyte flow between the outer wall of the abutment structure and the inner wall of the electrolyte filling body. The abutment structure is electrically connected to a controller. In practical use, the outlet of the electrolyte filling body is coaxially connected with the electrolyte filling hole of the battery. The controller then drives the abutment structure to move towards the battery, allowing it to pass through the outlet and the electrolyte filling hole sequentially, pushing open the adhesive tape on the back of the electrolyte filling hole to a preset position. Specifically, the abutment structure extends into the housing, pushing open and limiting the adhesive tape on the back of the electrolyte filling hole to the preset position. Then, the controller drives a vacuuming structure to perform a vacuuming process inside the battery. When the vacuum level inside the battery is less than the preset value, the controller drives the electrolyte injection body to add electrolyte into the battery. The electrolyte enters the inner cavity of the electrolyte injection body through the inlet, and then flows smoothly into the battery through the annular injection channel, the outlet, and the injection hole.

[0007] Based on this, this application uses a push-off structure to push open and limit the adhesive tape on the back side of the injection hole to a preset position, maintaining a preset safe distance between the adhesive tape and the back side of the injection hole. During vacuuming, the adhesive tape, under the pushing-off and limiting action of the push-off structure, will not be lifted or adhered to the back side of the injection hole under negative pressure adsorption, thus avoiding the phenomenon of adhesive tape clogging the injection hole. This ensures smooth electrolyte flow, guarantees sufficient electrolyte volume in the battery, ensures battery electrochemical performance and cycle life, and improves battery production yield. Simultaneously, with the same electrolyte volume, it effectively shortens the injection time and improves production efficiency.

[0008] In one possible design, the injection body includes a hollow mounting base and a hollow injection nozzle. The injection nozzle is connected to one side of the mounting base and communicates with the inner cavity of the mounting base. The outlet is located on the side of the injection nozzle opposite to the mounting base. The side of the mounting base opposite to the injection nozzle has an inlet, an air vent, and a clearance hole coaxially arranged with the outlet. A vacuuming structure communicates with the air vent, and a sealing structure passes through the clearance hole and can reciprocate along the centerline of the clearance hole.

[0009] The above design uses a mounting base and a filling nozzle as the liquid injection body, both of which are hollow structures with openings at both ends. The filling nozzle is connected to one end of the mounting base and communicates with its inner cavity. The inlet and outlet are located on opposite sides of the mounting base and the filling nozzle, respectively. The structure is simple and easy to manufacture. Furthermore, a vent hole for connecting the vacuuming structure is provided on the side of the mounting base away from the filling nozzle. This rational layout facilitates the assembly of the vacuuming structure and allows the gas inside the battery to rise and be quickly extracted, resulting in thorough venting and high vacuuming efficiency.

[0010] In one possible design, the injection nozzle has a cylindrical structure, and the inner cavity of the mounting base is larger than the inner diameter of the injection nozzle in the radial direction of the injection nozzle.

[0011] With the above design, the inner cavity size of the mounting base in the radial direction of the injection nozzle is larger than the inner diameter of the injection nozzle. Since the inlet and outlet are located on opposite sides of the mounting base and the injection nozzle, the inner cavity size of the injection nozzle on the inlet side is larger than that on the outlet side. This creates a gradually narrowing channel in the inner cavity of the injection nozzle along the direction from the inlet to the outlet, which rectifies, accelerates, and stabilizes the electrolyte entering the injection body, resulting in a stable and uniform flow rate of electrolyte exiting the outlet.

[0012] In one possible design, the injection nozzle has a cylindrical structure, and the inner diameter of the injection nozzle on the side facing the mounting base is larger than the inner diameter of the injection nozzle on the side away from the mounting base.

[0013] With the above design, since the inlet is located on the side of the mounting base away from the injection nozzle, and the outlet is located on the side of the injection nozzle away from the mounting base, the inner cavity size of the injection nozzle facing the inlet is larger than the inner cavity size of the injection nozzle facing the outlet. In other words, along the direction from the inlet to the outlet, the cylindrical inner cavity of the injection nozzle forms a gradually narrowing channel, which rectifies, accelerates, and stabilizes the voltage of the electrolyte entering the injection nozzle, thereby making the electrolyte flow rate from the outlet more stable and the flow velocity more uniform.

[0014] In one possible design, the side of the mounting base facing the injection nozzle is exposed outside the injection nozzle and is connected to a first detector electrically connected to the controller. The first detector is used to collect the position of the injection hole. The controller adjusts the position of the injection body according to the position signal collected by the first detector so that the outlet is coaxial and connected with the injection hole.

[0015] The above solution involves installing a first detector on the side of the mounting base facing the injection nozzle and electrically connecting it to the controller. When the outlet of the injection body is coaxially connected to the injection port of the battery, the first detector can collect the position signal of the injection port. The controller can then adjust the position of the injection body based on this signal, thus adjusting the outlet position. This facilitates rapid coaxial alignment and connection between the outlet and the injection port, improving the intelligence and efficiency of the battery injection device and resulting in higher overall efficiency of the injection process.

[0016] In one possible design, the abutment structure includes a drive assembly and abutment components. The drive assembly is electrically connected to the controller and is sealed through the side of the injection body opposite to the outlet. The abutment components are connected to one end of the drive assembly located inside the injection body and are coaxially arranged with the outlet. The end of the abutment components opposite to the drive assembly is used to abut the adhesive tape.

[0017] The above scheme configures the abutment structure as a drive assembly and an abutment component. The drive assembly is located on the side of the injection body opposite to the outlet and is electrically connected to the controller. The drive assembly is sealed and passes through the side of the injection body opposite to the outlet, and the abutment component is connected to the end of the drive assembly located inside the injection body and is coaxially arranged with the outlet. The structure is simple, easy to manufacture, and convenient to use.

[0018] In one possible design, the end of the abutment component that is away from the drive assembly is a flexible abutment head.

[0019] The above solution sets the end of the abutment facing the liquid outlet as a flexible abutment head. With this setting, the abutment pushes open the adhesive paper through the flexible abutment head, so that the contact area between the abutment and the adhesive paper is in flexible contact. This not only limits the opening of the adhesive paper and prevents the adhesive paper from blocking the back side of the injection hole, but also avoids scratching or tearing the adhesive paper, thus improving the safety of use.

[0020] In one possible design, the end of the abutting member away from the drive assembly has an abutting head protruding toward the adhesive tape, the abutting head being used to abut the adhesive tape.

[0021] With the above solution, a protruding abutment head is provided at the end of the abutment member facing the liquid outlet, which is directed towards the adhesive paper. This arrangement ensures that the abutment head and the adhesive paper are in point contact, reducing the contact area between the abutment head and the adhesive paper and lowering the risk of adhesion between them. This improves the separation efficiency of the abutment member from the adhesive paper after liquid injection and helps to enhance the overall working efficiency of the battery liquid injection device provided in this embodiment.

[0022] In one possible design, the drive assembly includes a cylinder and a drive rod. The cylinder is electrically connected to the controller, and the drive rod is sealed inside the injection body. One end of the drive rod is connected to the output end of the cylinder, and the other end of the drive rod is connected to the abutment.

[0023] The above scheme uses a cylinder and a drive rod as the driving components, with the cylinder electrically connected to the controller. The drive rod is sealed within the injection body, and its two ends are connected to the output end of the cylinder and the abutment, respectively. The controller drives the cylinder to operate, which in turn drives the drive rod to reciprocate along the centerline of the liquid outlet, thereby realizing the reciprocating movement of the abutment. The structure is simple, easy to manufacture, and convenient to use.

[0024] In one possible design, a sensor is placed between the drive assembly and the abutment, and the sensor is electrically connected to the controller. The sensor is used to detect the contact force between the abutment and the adhesive tape.

[0025] By using the above solution, a sensor is set up to detect the contact force between the abutment and the adhesive tape in real time. This allows for the regulation of the pushing force exerted by the abutment on the adhesive tape. On the one hand, it can prevent the adhesive tape from being damaged due to excessive pushing force. On the other hand, it can prevent the adhesive tape from being reliably pushed open and limited due to insufficient pushing force, thereby improving the degree of automation, safety and reliability.

[0026] In one possible design, the vacuuming structure includes a vacuum pump and a gas pipe; one end of the gas pipe is connected to the inner cavity of the liquid injection body, and the other end of the gas pipe is connected to the vacuum pump.

[0027] The above scheme sets the vacuuming structure as a vacuum pump and an air pipe. The vacuum pump is connected to the inner cavity of the liquid injection body through the air pipe. The structure is simple, easy to implement, and convenient to operate.

[0028] In one possible design, a second detector is provided in the inner cavity of the liquid injection body. The second detector is electrically connected to the controller and is used to detect the vacuum level inside the battery.

[0029] The above scheme involves setting up a second detector to detect the vacuum level inside the battery. Based on the vacuum level information detected by the second detector, it can be determined whether the vacuum level meets the requirements for electrolyte injection, ensuring the stability of the electrolyte injection pressure differential, making the injection volume sufficient and consistent, and improving product consistency and production yield.

[0030] In one possible design, the battery electrolyte filling device also includes an injection pump and an injection pipe; the inlet of the injection pump is connected to the outlet of the electrolyte storage device, and the outlet of the injection pump is connected to the inlet via the injection pipe.

[0031] The above solution involves installing an injection pump and injection pipe between the electrolyte storage unit and the inlet. Connecting the electrolyte storage unit and the inlet via these components allows for flexible positioning of both, improving ease of use and layout flexibility. Furthermore, when the vacuum level inside the battery is lower than a preset value, it facilitates rapid injection of electrolyte into the battery, thereby further shortening the injection time and improving production efficiency while maintaining the same injection volume.

[0032] In one possible design, when the abutment structure moves to a preset position inside the battery, the distance between the mating surface of the abutment structure and the adhesive tape and the inner wall of the battery facing the injection hole is 1.5mm-2mm.

[0033] With the above solution, when the abutting structure pushes open the adhesive tape and limits it to a preset position, the distance H between the side of the abutting structure facing the adhesive tape and the inner wall of the battery facing the injection hole is set to 1.5mm-2mm. In this way, the abutting structure can not only push open and limit the adhesive tape to prevent the adhesive tape from blocking the back side of the injection hole, but also avoid the phenomenon of the adhesive tape separating from the adapter piece due to excessive pushing open of the adhesive tape, thus improving the safety of use.

[0034] Secondly, this application provides a liquid injection method, the method comprising: Connect the inlet of the liquid injection body to the electrolyte storage device, and coaxially connect the outlet of the liquid injection body to the liquid injection hole of the battery. The controller drives the push-up structure to move towards the battery, passing through the liquid outlet and the liquid injection hole in sequence, and pushes the adhesive paper located on the back side of the liquid injection hole to the preset position; The controller drives the vacuum pumping structure to perform vacuuming on the inner cavity of the battery. When the vacuum level inside the battery is less than the preset value, the controller drives the electrolyte injection body to work, so as to inject the electrolyte into the battery through the inlet, the inner cavity of the electrolyte injection body, the outlet, and the injection hole.

[0035] The beneficial effects of the injection methods provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0036] Figure 1 This is a top view of a battery being injected with electrolyte using a battery injection device according to an embodiment of this application.

[0037] Figure 2 This is a schematic diagram of the structure for injecting electrolyte into a battery using the battery electrolyte injection device described in an embodiment of this application. Figure 1 .

[0038] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0039] Figure 4 This is a schematic diagram of the battery liquid injection device according to an embodiment of this application.

[0040] Figure 5 This is a schematic diagram of the structure for injecting electrolyte into a battery using the battery electrolyte injection device described in an embodiment of this application. Figure 2 .

[0041] Figure 6 for Figure 5 Enlarged view of section B in the middle.

[0042] Figure 7This is a partial structural schematic diagram of a battery electrolyte injection device according to another embodiment of this application.

[0043] Figure 8 This is a partial structural schematic diagram of a battery liquid injection device according to another embodiment of this application.

[0044] Figure 9 This application describes a method for injecting electrolyte into a battery using a battery electrolyte injection device according to an embodiment of the present application.

[0045] Explanation of reference numerals in the attached drawings: 10. Battery filling device; 1. Controller; 2. Filling body; 21. Mounting base; 211. Inlet; 212. Air hole; 22. Filling nozzle; 221. Outlet; 3. Pushing structure; 31. Drive assembly; 311. Cylinder; 312. Drive rod; 32. Pushing component; 321. Pushing head; 4. Vacuuming structure; 41. Vacuum pump; 42. Air pipe; 5. Sealing ring; 61. Filling pump; 62. Filling pipe; 71. First connector; 72. Second connector; 81. First detector; 82. Second detector; 9. Sensor; 20. Battery; 201. Cover plate; 202. Lower plastic; 203. Adhesive tape; 204. Filling hole. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] 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 in the specification of the application 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 drawings of this application are intended to cover non-exclusive inclusion.

[0048] The term "embodiment" as used herein 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 the phrase "embodiment" 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.

[0049] In this article, 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 mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0050] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the battery filling device of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0052] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0053] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection secured by screws, bolts, or other spacers; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is connected; it can also refer to the internal connection of two components. Signal connection can refer not only to signal connection through a circuit but also to signal connection through a medium, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] refer to Figures 1 to 4 As shown, this embodiment provides a battery electrolyte filling device 10, which is used to add electrolyte to a battery 20. The battery 20 has an electrolyte filling hole 204 for electrolyte inlet.

[0055] refer to Figure 2 and Figure 3 As shown, the battery 20 includes a cover plate 201 and a lower plastic 202, with the lower plastic 202 disposed on the side of the cover plate 201 facing the inner cavity of the battery 20. An injection hole 204 is formed on the cover plate 201. The lower plastic 202 has a clearance opening corresponding to the injection hole 204 to allow electrolyte to enter. Specifically, the radial dimension of the clearance opening is larger than the radial dimension of the injection hole 204.

[0056] refer to Figures 1 to 4 As shown, the battery liquid injection device 10 provided in this embodiment includes a controller 1, a vacuuming structure 4, a top support structure 3, and a hollow liquid injection body 2.

[0057] The top support structure 3, the vacuum extraction structure 4, and the electrolyte injection body 2 are electrically connected to the controller 1. In actual use, the controller 1 can drive the top support structure 3, the vacuum extraction structure 4, and the electrolyte injection body 2 to operate, thereby realizing the electrolyte injection operation of the battery 20.

[0058] For details, please refer to section 2 to 3. Figure 4 As shown, the liquid injection body 2 has an inlet 211 and an outlet 221. The inlet 211 is used to communicate with the electrolyte storage device, and the outlet 221 is used to communicate with the injection hole 204. A support structure 3 is sealed and inserted into the liquid injection body 2, and is coaxially arranged with the outlet 221. The outer wall of the support structure 3 is spaced apart from the inner wall of the liquid injection body 2, forming an annular injection channel for electrolyte flow between the outer wall of the support structure 3 and the inner wall of the liquid injection body 2. A vacuum structure 4 is connected to the inner cavity of the liquid injection body 2. The controller 1 is used to drive the support structure 3 to move towards the battery 20 when the outlet 221 and the injection hole 204 are coaxial and connected, sequentially passing through the outlet 221 and the injection hole 204, and pushing the adhesive tape 203 located on the back side of the injection hole 204 to a preset position, such as... Figure 5 and Figure 6 As shown. The controller 1 is used to drive the vacuum structure 4 to work after the push-off structure 3 pushes the adhesive paper 203 to a preset position; and when the vacuum degree in the battery 20 is less than a preset value, it drives the liquid injection body 2 to work so as to inject the electrolyte into the battery 20 through the liquid inlet 211, the inner cavity of the liquid injection body 2, the liquid outlet 221, and the liquid injection hole 204.

[0059] In practice, electrolyte storage devices are devices for storing electrolytes, such as storage tanks, storage cabinets, and storage boxes.

[0060] The electrolyte storage unit has an outlet for discharging the electrolyte inside. The inlet 211 of the electrolyte filling body 2 is connected to the outlet of the electrolyte storage unit.

[0061] In some implementations, refer to Figure 4 As shown, the injection body 2 can be a hollow cylindrical structure, with the outlet 221 coaxially located at one end of the injection body 2 along its axial direction. Since the abutment structure 3 is inserted into the injection body 2 and coaxially arranged with the outlet 221, the abutment structure 3 is symmetrically arranged within the injection body 2, resulting in a pleasing appearance and facilitating alignment between the outlet 221 and the injection hole 204, thus improving the overall efficiency of the injection process.

[0062] Furthermore, the annular injection channel between the outer wall of the top structure 3 and the inner wall of the injection body 2 is an axisymmetric and centrally symmetric figure. The center of symmetry of the annular injection channel is the central axis of the injection body 2. Thus, when the battery injection device 10 provided in this embodiment adds electrolyte to the battery 20, after the electrolyte enters the annular injection channel through the inlet 211 of the injection body 2, it can be evenly distributed along its circumference, and the flow resistance is uniformly distributed, thereby making the flow velocity of the electrolyte in the annular injection channel more uniform, and thus making the injection smooth and stable.

[0063] The battery electrolyte injection device 10 provided in this embodiment uses a sealing abutment structure 3 sealed through the electrolyte injection body 2. The abutment structure 3 is coaxially arranged with the outlet 221 of the electrolyte injection body 2, and its outer wall is spaced apart from the inner wall of the electrolyte injection body 2, forming an annular electrolyte injection channel for electrolyte flow between them. The abutment structure 3 is electrically connected to the controller 1. In practical use, the outlet 221 of the electrolyte injection body 2 is coaxially connected with the electrolyte injection hole 204 of the battery 20. The controller 1 drives the abutment structure 3 to move towards the battery 20, causing it to pass through the outlet 221 and the electrolyte injection hole 204 in sequence, pushing the adhesive tape 203 on the back of the electrolyte injection hole 204 to a preset position. That is, the abutment structure 3 extends into the housing and pushes open and limits the adhesive tape 203 on the back of the electrolyte injection hole 204 to the preset position. Then, the controller 1 drives the vacuum pumping structure 4 to perform a vacuuming process inside the battery 20. When the vacuum level inside the battery 20 is less than the preset value, the controller 1 drives the liquid injection body 2 to add electrolyte into the battery 20. The electrolyte enters the inner cavity of the liquid injection body 2 through the liquid inlet 211, and then flows smoothly into the battery 20 through the annular liquid injection channel, the liquid outlet 221, and the liquid injection hole 204.

[0064] Based on this, this embodiment uses the abutting structure 3 to push open and limit the adhesive tape 203 on the back side of the injection hole 204 to a preset position, maintaining a preset safe distance between the adhesive tape 203 and the back side of the injection hole 204. During vacuuming, under the abutting and limiting action of the abutting structure 3, the adhesive tape 203 will not be lifted or adhered to block the back side of the injection hole 204 under negative pressure adsorption, thus avoiding the phenomenon of the adhesive tape 203 blocking the injection hole 204. This ensures smooth electrolyte flow, guarantees sufficient electrolyte injection in the battery 20, ensures the electrochemical performance and cycle life of the battery 20, and improves the yield rate of battery 20 production. Simultaneously, with the same electrolyte injection volume, it effectively shortens the injection time and improves production efficiency.

[0065] It should be noted that after the electrolyte injection is completed, the controller 1 drives the abutment structure 3 to move away from the battery 20, so that the end of the abutment adhesive paper 203 of the abutment structure 3 moves into the electrolyte injection body 2 for subsequent use. At the same time, the electrolyte injection body 2 protects the end of the abutment structure 3 used for abutment adhesive paper 203, preventing it from being damaged during movement, transportation, etc., which helps to extend the service life of the battery electrolyte injection device 10 in this embodiment.

[0066] The back side of the injection hole 204 is the side of the injection hole 204 facing the inner cavity of the battery 20.

[0067] refer to Figures 2 to 4 As shown, in some embodiments, the injection body 2 includes a hollow mounting base 21 and a hollow injection nozzle 22. The injection nozzle 22 is connected to one side of the mounting base 21 and communicates with the inner cavity of the mounting base 21. The outlet 221 is opened on the side of the injection nozzle 22 opposite to the mounting base 21. The side of the mounting base 21 opposite to the injection nozzle 22 is provided with an inlet 211, an air hole 212, and a clearance hole coaxially arranged with the outlet 221. The vacuum structure 4 communicates with the air hole 212, and the abutment structure 3 is sealed and passes through the clearance hole and can reciprocate along the center line of the clearance hole.

[0068] The liquid injection body 2 is configured as a mounting base 21 and a liquid injection nozzle 22, both of which are hollow structures with openings at both ends. The liquid injection nozzle 22 is connected to one end opening of the mounting base 21 and communicates with the inner cavity of the mounting base 21. The liquid inlet 211 and the liquid outlet 221 are respectively opened on opposite sides of the mounting base 21 and the liquid injection nozzle 22, resulting in a simple structure that is easy to manufacture. Moreover, an air hole 212 for connecting the vacuum structure 4 is opened on the side of the mounting base 21 away from the liquid injection nozzle 22, which is a reasonable layout that facilitates the assembly of the vacuum structure 4 and allows the gas inside the battery 20 to gather upwards and be quickly extracted, resulting in thorough venting and high vacuum efficiency.

[0069] Meanwhile, a clearance hole is provided on the side of the mounting base 21 away from the injection nozzle 22, and the clearance hole is coaxial with the outlet 221 of the injection body 2. The abutment structure 3 is sealed and inserted through the clearance hole, that is, the abutment structure 3 is sealed and inserted through the side of the mounting base 21 away from the injection nozzle 22. This arrangement provides more space for the reciprocating movement of the abutment structure 3 and improves the ease of use.

[0070] In practice, the inner wall of the mounting base 21, the inner wall of the injection nozzle 22, and the outer wall of the top structure 3 together form an annular injection channel, which is reasonably laid out and easy to assemble.

[0071] In some embodiments, reference Figure 4 As shown, a flexible sealing ring 5 is provided in the clearance hole of the mounting base 21. The outer ring wall of the sealing ring 5 is fixed relative to the hole wall of the clearance hole. The abutment structure 3 passes through the inner ring of the sealing ring 5 and slides and seals with the inner ring wall of the sealing ring 5. When the abutment structure 3 reciprocates along the center line of the clearance hole, the abutment structure 3 slides axially relative to the sealing element, achieving linear reciprocating movement while maintaining sealing isolation.

[0072] In a practical implementation, the outer ring wall of the sealing ring 5 can be larger than the wall of the clearance hole, and the outer ring wall of the sealing ring 5 is interference-fitted with the wall of the clearance hole. Of course, in other implementations, the outer ring wall of the sealing ring 5 can also be fixed in the clearance hole by means of bonding, snap-fitting, etc.

[0073] In some implementations, the mounting base 21 and the injection nozzle 22 can be threaded together, making installation, disassembly, and replacement convenient. Of course, in other implementations, the mounting base 21 and the injection nozzle 22 can also be snapped together.

[0074] In some embodiments, reference Figure 4 and Figure 5 As shown, a first connector 71 is provided at the vent 212. The end of the vacuum structure 4 facing the liquid injection body 2 is connected and communicates with the first connector 71, which facilitates assembly and provides good sealing.

[0075] refer to Figure 2 and Figure 4 As shown, in some embodiments, the injection nozzle 22 has a cylindrical structure, and in the radial direction of the injection nozzle 22, the inner cavity size of the mounting base 21 is larger than the inner diameter of the injection nozzle 22.

[0076] In other words, the inner cavity dimension of the mounting base 21 in the radial direction of the injection nozzle 22 is larger than the inner diameter of the injection nozzle 22. Since the inlet 211 and outlet 221 are respectively opened on opposite sides of the mounting base 21 and the injection nozzle 22, the inner cavity dimension of the injection nozzle 22 on the inlet 211 side is larger than the inner cavity dimension of the injection nozzle 22 on the outlet 221 side. This forms a gradually narrowing channel in the inner cavity of the injection nozzle 22 along the direction from the inlet 211 to the outlet 221, which plays a role in rectifying, accelerating, and stabilizing the electrolyte entering the injection body 2, thereby making the electrolyte flow rate from the outlet 221 stable and the flow rate uniform.

[0077] In a specific implementation, the inner cavity of the mounting base 21 can be, for example, a cylindrical inner cavity. The cylindrical inner cavity of the mounting base 21 is coaxially arranged and connected with the inner cavity of the injection nozzle 22. The inner diameter of the mounting base 21 is larger than the inner diameter of the injection nozzle 22. The inner cavities of the mounting base 21 and the injection nozzle 22 form a cylindrical tapering channel along the direction from the inlet 211 to the outlet 221.

[0078] refer to Figure 4 As shown, in some embodiments, the injection nozzle 22 has a cylindrical structure, and the inner diameter of the injection nozzle 22 facing the mounting base 21 is larger than the inner diameter of the injection nozzle 22 facing away from the mounting base 21.

[0079] Since the inlet 211 is located on the side of the mounting base 21 away from the injection nozzle 22, and the outlet 221 is located on the side of the injection nozzle 22 away from the mounting base 21, the inner cavity size of the injection nozzle 22 facing the inlet 211 is larger than the inner cavity size of the injection nozzle 22 facing the outlet 221. In other words, along the direction from the inlet 211 to the outlet 221, the cylindrical inner cavity of the injection nozzle 22 forms a gradually narrowing channel, which rectifies, accelerates, and stabilizes the electrolyte entering the injection nozzle 22, thereby making the electrolyte flow rate from the outlet 221 more stable and the flow velocity more uniform.

[0080] For specific implementation, refer to Figure 4 As shown, the inner cavity of the injection nozzle 22 can be formed as a stepped cavity, for example, with the inner diameter of the stepped cavity facing the mounting base 21 being larger than the inner diameter of the stepped cavity facing the outlet 221. Of course, in other implementations, the inner cavity of the injection nozzle 22 can be a conical cavity, for example, with the inner diameter of the conical cavity facing the mounting base 21 being larger than the inner diameter of the conical cavity facing the outlet 221.

[0081] refer to Figure 4As shown, the inner diameter of the mounting base 21 is larger than the inner diameter of the injection nozzle 22 facing the inlet 211, and the inner diameter of the injection nozzle 22 facing the inlet 211 is larger than the inner diameter of the injection nozzle 22 facing the outlet 221. In the direction from the inlet 211 to the outlet 221, the inner cavity of the injection body 2 is formed into a two-stage gradually narrowing channel, which makes the electrolyte enter the battery 20 more stably and evenly through the outlet 221, resulting in higher injection reliability.

[0082] refer to Figure 4 As shown, in some embodiments, the side of the mounting base 21 facing the injection nozzle 22 is exposed outside the injection nozzle 22 and is connected to a first detector 81 electrically connected to the controller 1. The first detector 81 is used to collect the position of the injection hole 204. The controller 1 adjusts the position of the injection body 2 according to the position signal collected by the first detector 81 so that the outlet 221 is coaxial and connected with the injection hole 204.

[0083] A first detector 81 is installed on the side of the mounting base 21 facing the injection nozzle 22, and the first detector 81 is electrically connected to the controller 1. When the outlet 221 of the injection body 2 is coaxially connected with the injection hole 204 of the battery 20, the position signal of the injection hole 204 can be collected by the first detector 81. In this way, the controller 1 can adjust the position of the injection body 2 according to the position signal of the injection hole 204, thereby adjusting the position of the outlet 221. This facilitates the quick coaxial connection and alignment of the outlet 221 and the injection hole 204, improving the intelligence and working efficiency of the battery injection device 10, and thus making the overall working efficiency of the injection process higher.

[0084] In a specific implementation, the first detector 81 can be, for example, a visual camera, a laser rangefinder, etc.

[0085] refer to Figure 4 As shown, in some embodiments, the abutting structure 3 includes a drive assembly 31 and an abutting member 32. The drive assembly 31 is electrically connected to the controller 1 and is sealed and inserted through the side of the injection body 2 opposite to the outlet 221. The abutting member 32 is connected to one end of the drive assembly 31 located inside the injection body 2 and is coaxially arranged with the outlet 221. The end of the abutting member 32 opposite to the drive assembly 31 is used to abut the adhesive tape 203.

[0086] By configuring the abutment structure 3 as a drive assembly 31 and an abutment member 32, the drive assembly 31 is located on the side of the injection body 2 opposite to the outlet 221 and is electrically connected to the controller 1. The drive assembly 31 is sealed and passes through the side of the injection body 2 opposite to the outlet 221, and the abutment member 32 is connected to the end of the drive assembly 31 located inside the injection body 2 and is coaxially arranged with the outlet 221. The structure is simple, easy to manufacture, and convenient to use.

[0087] In practical use, when the inlet 211 and outlet 221 are coaxial and connected, the controller 1 drives the drive assembly 31 to move towards the battery 20. The drive assembly 31 then drives the abutment 32 to move towards the battery 20, so that the abutment 32 passes through the outlet 221 and the injection hole 204 and abuts against the adhesive tape 203, pushing the adhesive tape 203 open and limiting it in a preset position. That is, the abutment 32 extends into the battery 20 under the drive of the drive assembly 31 and abuts and limits the adhesive tape 203 in a preset position, so that the adhesive tape 203 and the back of the injection hole 204 maintain a preset safe distance. It has a high degree of intelligence and is convenient to use.

[0088] In some embodiments, one end of the abutment member 32 that is away from the drive assembly 31 is a flexible abutment head 321.

[0089] In other words, the end of the abutment 32 facing the liquid outlet 221 is set as a flexible abutment head 321. With this setting, the abutment 32 pushes open the adhesive paper 203 through the flexible abutment head 321, so that the contact area between the abutment 32 and the adhesive paper 203 is in flexible contact. This not only pushes open and limits the adhesive paper 203, preventing the adhesive paper 203 from blocking the back side of the injection hole 204, but also avoids scratching or tearing the adhesive paper 203, thus improving the safety of use.

[0090] Meanwhile, the abutment 32 pushes the adhesive paper 203 through the flexible abutment head 321, making the contact and adhesion between the abutment 32 and the adhesive paper 203 more stable and less prone to slippage, thus improving the reliability of the battery liquid injection device 10 provided in this embodiment.

[0091] In some implementations, the abutment head 321 can be made of flexible materials, such as polyetheretherketone (PEEK) or rubber, making the abutment head 321 a flexible abutment head as a whole. Of course, in other implementations, a flexible layer, such as a rubber layer or a polytetrafluoroethylene layer, can be wrapped around the outer wall of the abutment head 321 to make the abutment head 321 a flexible abutment head.

[0092] refer to Figure 2 , Figure 4 and Figure 6 As shown, in some embodiments, one end of the abutment member 32 away from the drive assembly 31 has an abutment head 321 protruding toward the adhesive tape 203, the abutment head 321 being used to abut the adhesive tape 203.

[0093] In other words, a pusher head 321 protruding towards the adhesive tape 203 is provided at one end of the pusher member 32 facing the liquid outlet 221. With this arrangement, the pusher head 321 and the adhesive tape 203 are in point contact, which reduces the contact area between the pusher head 321 and the adhesive tape 203 and reduces the risk of the pusher head 321 and the adhesive tape 203 sticking together. This improves the separation efficiency of the pusher member 32 from the adhesive tape 203 after liquid injection and helps to improve the overall working efficiency of the battery liquid injection device 10 provided in this embodiment.

[0094] Meanwhile, the abutment head 321 protrudes towards the adhesive paper 203, making point contact between the abutment head 321 and the adhesive paper 203. This also avoids the phenomenon of the adhesive paper 203 being pulled upward and torn when the abutment member 32 moves towards the direction of the drive assembly 31 for reset, thus improving the safety and reliability of the battery liquid injection device 10 provided in this embodiment.

[0095] In some embodiments, reference Figure 2 , Figure 4 and Figure 6 As shown, the abutment head 321 is a spherical abutment head. The ratio of the diameter of the spherical abutment head to the diameter of the injection hole 204 can be 1:2 to 1:3.

[0096] In other embodiments, reference is made to... Figure 7 As shown, the abutment head 321 is a conical abutment head. The cone angle can be, for example, 45°, and the front end is rounded. At the same time, when there is a slight eccentricity between the abutment head 321 and the injection hole 204, the conical abutment head also guides the movement of the abutment member 32, so that the abutment member 32 automatically corrects the deviation during the movement, which to a certain extent reduces the design accuracy and manufacturing accuracy of the abutment member 32.

[0097] In other embodiments, reference is made to... Figure 8 As shown, the side of the abutment head 321 facing the adhesive tape 203 is a plane.

[0098] refer to Figure 4 As shown, in some embodiments, the drive assembly 31 includes a cylinder 311 and a drive rod 312. The cylinder 311 is electrically connected to the controller 1, and the drive rod 312 is sealed and inserted into the liquid injection body 2. One end of the drive rod 312 is connected to the output end of the cylinder 311, and the other end of the drive rod 312 is connected to the abutment 32.

[0099] The drive assembly 31 is configured as a cylinder 311 and a drive rod 312, with the cylinder 311 electrically connected to the controller 1. The drive rod 312 is sealed and inserted into the liquid injection body 2, with its two ends connected to the output end of the cylinder 311 and the abutment 32, respectively. The controller 1 drives the cylinder 311 to operate, thereby driving the drive rod 312 to reciprocate along the centerline of the liquid outlet 221, thus realizing the reciprocating movement of the abutment 32. The structure is simple, easy to manufacture, and convenient to use.

[0100] In practice, the drive rod 312 is sealed and inserted into the clearance hole on the side of the mounting base 21 away from the injection nozzle 22, and the aforementioned sealing ring 5 is provided between the drive rod 312 and the clearance hole.

[0101] refer to Figure 4 As shown, in some embodiments, a sensor 9 is provided between the drive assembly 31 and the abutment 32. The sensor 9 is electrically connected to the controller 1 and is used to detect the contact force between the abutment 32 and the adhesive tape 203.

[0102] By setting sensor 9 to detect the contact force between the abutment 32 and the adhesive tape 203 in real time, the pushing force of the abutment 32 on the adhesive tape 203 can be adjusted. On the one hand, it can avoid the adhesive tape 203 from being damaged due to excessive pushing force. On the other hand, it can avoid the adhesive tape 203 from being unable to be reliably pushed open and limited due to insufficient pushing force, thereby improving the degree of automation, safety and reliability.

[0103] In practice, sensor 9 can be, for example, a force sensor, which has a simple structure and is easy to implement.

[0104] refer to Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments, the vacuum structure 4 includes a vacuum pump 41 and an air pipe 42; one end of the air pipe 42 is connected to the inner cavity of the liquid injection body 2, and the other end of the air pipe 42 is connected to the vacuum pump 41.

[0105] By setting the vacuum structure 4 as a vacuum pump 41 and an air pipe 42, the vacuum pump 41 is connected to the inner cavity of the liquid injection body 2 through the air pipe 42. The structure is simple, easy to implement, and convenient to operate.

[0106] For specific implementation, refer to Figure 4 As shown, the end of the trachea 42 facing the injection body 2 is connected and communicated with the first connector 71 on the mounting base 21, which is convenient to assemble and has good sealing performance.

[0107] refer to Figure 4 As shown, in some embodiments, a second detector 82 is provided in the inner cavity of the liquid injection body 2. The second detector 82 is electrically connected to the controller 1 and is used to detect the vacuum degree in the battery 20.

[0108] By setting a second detector 82 to detect the vacuum level inside the battery 20, the vacuum level detected by the second detector 82 can be used to determine whether the vacuum level meets the requirements for electrolyte injection, thus ensuring the stability of the electrolyte injection pressure differential, making the injection volume sufficient and consistent, and improving product consistency and production yield.

[0109] In practice, the second detector 82 can be, for example, a vacuum sensor, which has a simple structure and is easy to implement.

[0110] refer to Figure 4 As shown, in some embodiments, the battery filling device 10 further includes a filling pump 61 and a filling pipe 62; the inlet of the filling pump 61 is connected to the outlet of the electrolyte storage device, and the outlet of the filling pump 61 is connected to the inlet 211 through the filling pipe 62.

[0111] By installing an injection pump 61 and an injection pipe 62 between the electrolyte storage unit and the inlet 211, the electrolyte storage unit and the inlet 211 are connected through the injection pump 61 and the injection pipe 62. On the one hand, this allows for more flexible positioning of the electrolyte storage unit and the injection body 2, improving ease of use and layout flexibility. On the other hand, when the vacuum degree inside the battery 20 is less than a preset value, it facilitates the rapid injection of electrolyte into the battery 20, thereby further shortening the injection time and improving production efficiency while maintaining the same injection volume.

[0112] In some embodiments, reference Figure 4 and Figure 5 As shown, a second connector 72 is provided at the liquid inlet 211 of the mounting base 21. The end of the injection tube 62 facing the mounting base 21 is connected to and communicates with the second connector 72, which facilitates assembly and provides good sealing.

[0113] refer to Figure 6 As shown, in some embodiments, when the abutment structure 3 moves to a preset position inside the battery 20, the distance H between the mating surface of the abutment structure 3 and the adhesive tape 203 and the inner wall of the battery 20 on the side facing the injection hole 204 is 1.5mm-2mm.

[0114] In other words, when the abutting structure 3 pushes open the adhesive tape 203 and limits it to a preset position, the distance H between the side of the abutting structure 3 facing the adhesive tape 203 and the inner wall of the battery 20 facing the liquid injection hole 204 is set to 1.5mm-2mm. In this way, the abutting structure 3 can both push open and limit the adhesive tape 203 to prevent the adhesive tape 203 from blocking the back side of the liquid injection hole 204, and avoid the phenomenon of the adhesive tape 203 separating from the adapter piece due to excessive pushing open of the adhesive tape 203, thereby improving the safety of use.

[0115] At the same time, it avoids the phenomenon that the top structure 3 may damage the internal components of the battery 20 due to extending too far into the battery 20, thus ensuring high safety in use.

[0116] In practice, the preset position corresponds to the stroke of the abutment structure 3, and the stroke is a stroke parameter preset in the controller 1.

[0117] refer to Figures 4 to 6 as well as Figure 9 As shown, this application provides a method for injecting electrolyte into a battery 20 using the battery electrolyte injection device 10 as described above, the method comprising: S101. Connect the inlet 211 of the liquid injection body 2 to the electrolyte storage device, and coaxially connect the outlet 221 of the liquid injection body 2 to the liquid injection hole 204 of the battery 20.

[0118] Connect the inlet 211 of the liquid injection body 2 to the electrolyte storage device. Adjust the position of the liquid injection body 2 so that the outlet 221 of the liquid injection body 2 is coaxially connected to the liquid injection hole 204 of the battery 20.

[0119] When adjusting the position of the liquid injection body 2, the controller 1 can adjust the position of the liquid injection body 2 according to the position signal collected by the first detector 81, so that the liquid outlet 221 of the liquid injection body 2 can be quickly coaxially connected with the liquid injection hole 204 of the battery 20.

[0120] S102, the controller 1 drives the push-off structure 3 to move toward the direction close to the battery 20, passing through the liquid outlet 221 and the liquid injection hole 204 in sequence, and pushes the adhesive paper 203 located on the back side of the liquid injection hole 204 to the preset position.

[0121] Specifically, the controller 1 drives the cylinder 311 to work, and the cylinder 311 drives the drive rod 312 to move along the center line of the liquid outlet 221 toward the direction of approaching the battery 20. The drive rod 312 drives the abutment 32 to move toward the direction of approaching the battery 20, so that the abutment 32 passes through the liquid outlet 221 and the liquid injection hole 204 and pushes the adhesive paper 203 located on the back side of the liquid injection hole 204 to the preset position. The structure is simple, easy to manufacture, and convenient to use.

[0122] In practice, cylinder 311 first drives the abutment 32 to move towards the battery 20 at a first speed. When sensor 9 detects that the contact force between the abutment 32 and the adhesive tape 203 has reached a preset threshold, cylinder 311 decelerates and drives the abutment 32 to continue moving towards the battery 20 at a second speed to a preset position. This configuration ensures that the adhesive tape 203 is pushed open to the limit and prevents the adhesive tape 203 from blocking the back of the injection hole 204. It also avoids the abutment 32 from moving excessively and damaging the internal components of the battery 20, thus improving the level of automation and safety.

[0123] The preset threshold can be, for example, 0.3N.

[0124] The first speed could be, for example, 20 mm / s, and the second speed could be, for example, 5 mm / s.

[0125] S103, the controller 1 drives the vacuum structure 4 to work, so as to perform vacuum treatment on the inner cavity of the battery 20.

[0126] When the abutment 32 pushes the adhesive tape 203 to the preset position, the controller 1 drives the vacuum pump 41 to work. The vacuum pump 41 performs vacuum treatment on the inner cavity of the battery 20 and the inner cavity of the liquid injection body 2 to form a vacuum negative pressure environment in the inner cavity of the battery 20. The structure is simple, easy to use, and highly automated.

[0127] It should be noted that in step S102, after the abutting member 32 pushes the adhesive tape 203 to the preset position, it holds it for a preset time, such as 0.3s, and then the controller 1 executes step S103 to ensure that the adhesive tape 203 is stably limited to the preset position, which helps to improve the reliability of liquid injection.

[0128] S104. When the vacuum level inside the battery 20 is less than the preset value, the controller 1 drives the liquid injection body 2 to work, so as to inject the electrolyte into the battery 20 through the liquid inlet 211, the inner cavity of the liquid injection body 2, the liquid outlet 221, and the liquid injection hole 204.

[0129] When the second detector 82 detects that the vacuum level inside the battery 20 is less than the preset value, the controller 1 drives the injection pump 61 to work, and the injection pump 61 adds electrolyte into the battery 20. It has a high degree of automation and is easy to use.

[0130] In some embodiments, after step S104, the method further includes: S105, the controller 1 drives the abutment structure 3 to move in the opposite direction away from the battery 20 and reset it into the inner cavity of the liquid injection body 2.

[0131] In other words, after the liquid injection is completed, the controller 1 drives the cylinder 311 to work, and the cylinder 311 drives the drive rod 312 to move away from the battery 20 along the center line of the liquid outlet 221. The drive rod 312 then drives the abutment 32 to move away from the battery 20 and reset, sequentially exiting the liquid injection hole 204 and the liquid outlet 221 and moving into the inner cavity of the liquid injection body 2, completing one liquid injection cycle, which is convenient for subsequent use.

[0132] In specific implementation, when executing step S105, the cylinder 311 can, for example, first drive the abutment 32 to retract a preset stroke, such as 1 mm, in the direction away from the battery 20, and then, after a preset duration, such as 0.2 s, drive the abutment 32 to continue retracting in the direction away from the battery 20 into the injection nozzle 22.

[0133] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery electrolyte filling device, wherein the battery has an electrolyte filling hole, characterized in that, The battery liquid injection device includes a controller and a vacuuming structure, a support structure, and a hollow liquid injection body, all electrically connected to the controller. The liquid injection body has an inlet and an outlet. The inlet is used to communicate with the electrolyte storage device, and the outlet is used to communicate with the injection hole. The abutment structure is sealed and passes through the liquid injection body and is coaxially arranged with the outlet. The outer wall of the abutment structure is spaced apart from the inner wall of the liquid injection body. The vacuum structure is connected to the inner cavity of the liquid injection body. The controller is used to drive the push-off structure to move toward the direction of the battery when the liquid outlet and the liquid injection hole are coaxial and connected, so that the structure passes through the liquid outlet and the liquid injection hole in sequence and pushes the adhesive paper located on the back side of the liquid injection hole to a preset position. The controller is used to drive the vacuuming structure to work after the abutting structure pushes the adhesive tape to the preset position; When the vacuum level inside the battery is less than a preset value, the liquid injection body is driven to work, so as to inject the electrolyte into the battery through the liquid inlet, the inner cavity of the liquid injection body, the liquid outlet, and the liquid injection hole.

2. The battery electrolyte injection device according to claim 1, characterized in that, The injection body includes a hollow mounting base and a hollow injection nozzle; The injection nozzle is connected to one side of the mounting base and communicates with the inner cavity of the mounting base, and the outlet is opened on the side of the injection nozzle opposite to the mounting base. The mounting base has an inlet, an air hole, and a clearance hole coaxially arranged with the outlet on the side opposite to the injection nozzle. The vacuum structure is connected to the air hole, and the abutment structure is sealed and passed through the clearance hole and can reciprocate along the center line of the clearance hole.

3. The battery electrolyte injection device according to claim 2, characterized in that, The injection nozzle has a cylindrical structure, and in the radial direction of the injection nozzle, the inner cavity size of the mounting base is larger than the inner diameter of the injection nozzle; And / or, the injection nozzle has a cylindrical structure, and the inner diameter of the injection nozzle on the side facing the mounting base is greater than the inner diameter of the injection nozzle on the side away from the mounting base.

4. The battery electrolyte injection device according to claim 2, characterized in that, The side of the mounting base facing the injection nozzle is exposed outside the injection nozzle and is connected to a first detector electrically connected to the controller. The first detector is used to collect the position of the injection hole. The controller adjusts the position of the injection body according to the position signal collected by the first detector so that the outlet is coaxial and connected with the injection hole.

5. The battery electrolyte injection device according to claim 1, characterized in that, The abutting structure includes a drive assembly and an abutting component; The drive assembly is electrically connected to the controller and is sealed through the side of the injection body opposite to the outlet. The abutment is connected to one end of the drive assembly located inside the injection body and is coaxially arranged with the outlet. The end of the abutment opposite to the drive assembly is used to abut the adhesive tape.

6. The battery electrolyte injection device according to claim 5, characterized in that, The end of the abutment that faces away from the drive assembly is a flexible abutment head; And / or, the end of the abutting member opposite to the drive assembly has an abutting head protruding toward the adhesive tape, the abutting head being used to abut the adhesive tape.

7. The battery electrolyte injection device according to claim 5, characterized in that, The drive assembly includes a cylinder and a drive rod. The cylinder is electrically connected to the controller. The drive rod is sealed and passes through the liquid injection body. One end of the drive rod is connected to the output end of the cylinder, and the other end of the drive rod is connected to the abutment. And / or, a sensor is provided between the drive assembly and the abutment, the sensor is electrically connected to the controller, and the sensor is used to detect the contact force between the abutment and the adhesive tape.

8. The battery electrolyte filling device according to any one of claims 1 to 7, characterized in that, The vacuuming structure includes a vacuum pump and an air pipe; one end of the air pipe is connected to the inner cavity of the liquid injection body, and the other end of the air pipe is connected to the vacuum pump. And / or, a second detector is provided in the inner cavity of the liquid injection body, the second detector is electrically connected to the controller, and is used to detect the vacuum degree in the battery.

9. The battery electrolyte filling device according to any one of claims 1 to 7, characterized in that, The battery electrolyte filling device further includes an injection pump and an injection pipe; the inlet of the injection pump is connected to the outlet of the electrolyte storage device, and the outlet of the injection pump is connected to the inlet through the injection pipe. And / or, when the abutting structure pushes the adhesive tape to a preset position, the distance between the mating surface of the abutting structure and the adhesive tape and the inner wall of the battery facing the injection hole is 1.5mm-2mm.

10. A method for injecting electrolyte into a battery using the battery electrolyte injection device as described in any one of claims 1 to 9, characterized in that, The method includes: The inlet of the liquid injection body is connected to the electrolyte storage device, and the outlet of the liquid injection body is coaxially connected to the liquid injection hole of the battery. The controller drives the push-off structure to move toward the direction of the battery, passing through the liquid outlet and the liquid injection hole in sequence, and pushes the adhesive paper located on the back side of the liquid injection hole to a preset position; The controller drives the vacuum pumping structure to perform vacuum pumping on the inner cavity of the battery. When the vacuum level inside the battery is less than a preset value, the controller drives the liquid injection body to work, so as to inject the electrolyte into the battery through the inlet, the inner cavity of the liquid injection body, the outlet, and the injection hole.

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