Electrolyte filling device for battery negative pressure formation

Abstract

The application discloses an electrolyte filling device for battery negative pressure formation, which comprises a busbar and a plurality of self-sealing cups. The busbar is provided with a plurality of mounting grooves, the mounting grooves are communicated with a busbar cavity of the busbar, and the busbar is provided with an air pipe joint. The self-sealing cup comprises a shell, a bushing and a top cover. The shell has a shell cavity, and has opposite first and second ends. The first end is opposite to a liquid injection port of a battery top cover, and is provided with a suction nozzle communicated with the shell cavity. The second end is provided with a guide structure, and the guide structure is provided with a medium flow channel communicated with the shell cavity. The bushing is fixed in the mounting groove, and is sleeved on the guide structure in a sliding fit mode. In the length direction, the bushing and the guide structure are elastically connected. The top cover is located in the busbar cavity, and is connected with the guide structure. The top cover is provided with a switching flow channel communicated with the medium flow channel. An opening of the switching flow channel is located on the side surface of the top cover. The top cover is provided with a sealing structure matched with the bushing on the outer side. Therefore, vacuum can be conveniently extracted, and then electrolyte can be filled. The structure is simple, and maintenance is easy.

Description

Technical Field

[0001] This utility model relates to the technical field of electrolyte filling equipment, and in particular to an electrolyte filling device for battery negative pressure formation. Background Technology

[0002] Negative pressure formation is a crucial step in lithium-ion battery production, primarily used for electrolyte injection and SEI film formation during the initial activation process. Negative pressure formation removes air and impurities from inside the battery through vacuuming, ensuring sufficient contact between the electrolyte and the negative electrode material to form a stable SEI film (solid electrolyte interface film).

[0003] During the conventional formation process, air bubbles are easily generated inside the battery, and residual air can affect the quality of the battery when filling the electrolyte. Therefore, a special negative pressure environment is needed to remove the air bubbles before filling the electrolyte. Utility Model Content

[0004] This application provides an electrolyte filling device for negative pressure formation of batteries, which can easily extract air bubbles and air from the battery. After reaching a vacuum environment, the electrolyte is filled into the battery through the air pipe connector. The overall structure is ingenious, simple, and easy to disassemble and maintain.

[0005] This application provides an electrolyte filling device for negative pressure formation of batteries, including a manifold and multiple self-sealing cups. The manifold has multiple mounting grooves sequentially arranged along its length on the same side. Each mounting groove mates with one of the multiple self-sealing cups and connects to the manifold's manifold cavity. The side wall of the manifold has a duct connector connecting to the manifold cavity. Each self-sealing cup includes:

[0006] The housing has a cavity, and the housing has a first end and a second end opposite each other in the length direction, wherein the first end is opposite to the liquid injection port of the battery top cover and is provided with a suction nozzle communicating with the cavity, wherein the second end extends coaxially with a guide structure, and the guide structure is provided with a medium flow channel communicating with the cavity.

[0007] A bushing is fixed to the mounting groove on the outside and is fitted onto the guide structure in a sliding fit. The bushing and the guide structure are elastically connected in the length direction.

[0008] A top cover is located inside the manifold and connected to the guide structure. The top cover has a transition channel that connects to the medium flow channel. The opening of the transition channel is located on the side of the top cover. The top cover has a sealing structure that cooperates with the bushing on the outside of the opening.

[0009] In one possible implementation, the busbar includes a main body and a cover plate, the mounting grooves are evenly distributed on one side of the main body, and the cover plate is detachably connected to the main body on the opposite side of the main body.

[0010] In one possible implementation, the endotracheal connector is a quick-connect connector, and there are multiple endotracheal connectors, which are spaced apart along the length of the manifold on the side of the main body.

[0011] In one possible implementation, the guide structure is a connecting shaft, the guide structure is detachably connected to the second end, and the top cover and the connecting shaft are detachably connected.

[0012] In one possible implementation, the medium flow channel is tapered at one end near the cavity, and the outer diameter of the tapered shape gradually decreases from one end near the cavity to the other end.

[0013] In one possible implementation, the opening is one or more, and when the opening is multiple, the opening is radially symmetrically distributed on the top cover.

[0014] In one possible implementation, the sealing structure is a sloping flexible structure, and the end of the bushing away from the housing has an arc-shaped transition structure on its inner side that cooperates with the sealing structure.

[0015] In one possible implementation, a sealing sleeve is embedded in the bushing in a sealed manner, the sealing sleeve is slidably engaged with the guide structure, the guide structure has a limiting step at one end near the housing, the limiting step is directly opposite the bushing, and the bushing is elastically connected to the limiting step on the outside by a spring.

[0016] In one possible implementation, the first end is detachably connected to a base, and the suction nozzle is located within the base.

[0017] In one possible implementation, the housing has a double-layer structure, including an inner transparent plastic layer and an outer stainless steel layer, the stainless steel layer having a viewing window.

[0018] Beneficial effects: Compared with the prior art, the electrolyte filling device for negative pressure formation of batteries provided in this application can automatically open the self-sealing cup when the battery is pushed upwards by the combination of the manifold and the self-sealing cup. The air bubbles and air inside the battery are removed by the air pipe joint to form a vacuum environment. Then, the electrolyte is filled into the battery through the air pipe joint. At the same time, after the battery moves away from the manifold and moves downwards, the self-sealing cup will automatically self-seal, forming a stable low-pressure closed space between the battery and the self-sealing cup. At this time, the electrolyte can fully wet the surface of the battery and form a stable SEI film. The overall structure is exquisite and simple, and easy to disassemble, repair and maintain.

[0019] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0020] Figure 1 A three-dimensional structural schematic diagram of the electrolyte filling device for battery negative pressure formation according to this application is shown.

[0021] Figure 2 This paper shows a front cross-sectional view of the electrolyte filling device for battery negative pressure formation according to this application.

[0022] Figure 3 This application shows Figure 2 A magnified structural diagram of part A in the middle.

[0023] Figure 4 A cross-sectional view of the self-sealing cup in this application is shown.

[0024] Figure 5 This diagram shows a partial cross-sectional view of the self-sealing cup in its sealed state. Detailed Implementation

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0026] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 this utility model 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, the above terms should not be construed as limitations on this utility model.

[0027] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0028] refer to Figures 1 to 5 This application provides an electrolyte filling device for negative pressure formation of batteries, including a manifold 10 and multiple self-sealing cups 20. The manifold 10 has multiple mounting grooves 101 arranged sequentially along its length on the same side. Each mounting groove 101 mates with one of the multiple self-sealing cups 20 and connects to the manifold cavity 102 of the manifold 10. The number and specifications of the self-sealing cups 20 are adapted to the number and specifications of the batteries 30, and the self-sealing cups 20 are weakly coupled to the manifold 10. The sidewall of the manifold 10 has a duct connector 11 connecting to the manifold cavity 102. Each self-sealing cup 20 includes a housing 21, a bushing 22, and a top cover 23. The housing 21 has a cavity 201. The housing 20 has a first end and a second end opposite each other in the longitudinal direction. The first end is directly opposite the liquid injection port of the top cover of the battery 30 and is provided with a suction nozzle 24 communicating with the housing cavity 201. The second end extends coaxially with a guide structure 25, and the guide structure 25 is provided with a medium flow channel 202 communicating with the housing cavity 201. The bushing 22 is fixed to the mounting groove 101 by means of an external thread on the outer side of the bushing 22, and the bushing 22 is screwed into the mounting groove 101 by the external thread. The bushing 22 is slidably fitted onto the guide structure 25, so that when the bushing 22 is fixed on the busbar 10, the guide structure 25 can move directionally within the bushing 22. In addition, the bushing 22 and the guide structure 25 are elastically connected in the longitudinal direction. The top cover 23 is located inside the manifold 102 and connected to the guide structure 25. The top cover 23 is provided with a transition channel 203 that connects to the medium flow channel 202. The opening 204 of the transition channel 203 is located on the side of the top cover 23, and the top cover 23 is provided with a sealing structure 26 that cooperates with the bushing 22 on the outside of the opening 204.

[0029] When the battery 30 pushes the self-sealing cup 20 upwards, the top cover 23 moves into the manifold 102, opening the self-sealing cup 20 and connecting the battery 30 and the manifold 102. Then, the air bubbles and air in the manifold 10, self-sealing cup 20 and battery 30 can be removed by negative pressure through the air pipe connector 11 to achieve a vacuum environment. After that, the electrolyte is injected into the battery 30 through the air pipe connector 11. When the battery 30 moves downwards, the self-sealing cup 20 will automatically form a seal based on the elastic connection between the bushing 22 and the guide structure 25, forming a stable low-pressure closed space between the battery 30 and the self-sealing cup 20. At this time, the electrolyte can fully wet the surface of the battery 30 to form a stable SEI film.

[0030] The endotracheal connector 11 is a quick-connect connector. As a prior art technology, it has a self-sealing effect. That is, when the external negative pressure air source is pulled out after the evacuation is completed, the endotracheal connector 11 will automatically disconnect, forming a vacuum environment between the manifold 102, the self-sealing cup 20 and the battery 30. When the endotracheal connector 11 is reconnected to the electrolyte input pipe, it will automatically open, and at this time, electrolyte can be injected into the battery 30.

[0031] More specifically, when the battery 30 pushes the self-sealing cup 20 upward, it pushes the housing 21 and the top cover 23 to move away from the first end, opening the self-sealing cup 20. The housing cavity 201, the medium flow channel 202, the transfer flow channel 203, and the manifold 102 are connected. Through the air pipe connector 11, negative pressure can be used to remove air bubbles and air from inside the battery 30, creating a vacuum environment. When the battery 30 moves downward, due to the elastic connection between the bushing 22 and the guide structure 25 in the length direction, the top cover 23 and the housing 21 move in the opposite direction and reset under the rebound action. The sealing structure 26 and the bushing 22 cooperate to form a self-sealing state again, closing the self-sealing cup 20 and forming a stable low-pressure closed space between the battery 30 and the self-sealing cup 20. At this time, the electrolyte can fully wet the surface of the battery 30, forming a stable SEI film.

[0032] Therefore, the electrolyte filling device for negative pressure formation of batteries provided in this application can not only conveniently extract air bubbles and air from the battery 30, and fill the battery 30 with electrolyte through the air pipe connector 11 after a vacuum environment is reached, but also has a compact and simple overall structure, and is easy to disassemble, repair and maintain.

[0033] In one embodiment, the busbar 10 includes a main body 12 and a cover plate 13, wherein the mounting grooves 101 are evenly distributed on one side of the main body 12, and the cover plate 13 is detachably connected to the main body 12 on the opposite side of the main body 12, thereby facilitating the cleaning and maintenance of the busbar 10.

[0034] In one embodiment, there are multiple tracheal connectors 11, and the multiple tracheal connectors 11 are spaced apart along the length direction of the manifold 10 on the side of the main body 12, so that air can be drawn out of the manifold 102 or electrolyte can be injected into the manifold 102 more quickly and evenly through the multiple tracheal connectors 11.

[0035] In one embodiment, the guide structure 25 is a connecting shaft, and the guide structure 25 is detachably connected to the second end. The top cover 23 is also detachably connected to the connecting shaft, thereby facilitating installation, disassembly, and maintenance.

[0036] In one embodiment, the medium flow channel 202 is tapered at one end near the cavity 201, and the outer diameter of the tapered shape gradually decreases from one end near the cavity 201 to the other end. The tapered structure can limit the flow of the medium from the cavity 201 to the medium flow channel 202.

[0037] In one embodiment, there is one or more openings 204. When there are multiple openings 204, the openings 204 are radially symmetrically distributed on the top cover 23. For example, two openings 204 are opened in opposite straight directions, or three to six openings 204 are evenly started in the radial plane. It can be flexibly processed according to actual needs.

[0038] In one embodiment, the sealing structure 26 is a sloping flexible structure, and the end of the bushing 22 away from the housing 21 has an arc-shaped transition structure on its inner side that cooperates with the sealing structure 26, resulting in a good sealing effect.

[0039] In one embodiment, a sealing sleeve 27 is embedded within the bushing 22 in a sealed manner, and the sealing sleeve 27 slides in conjunction with the guide structure 25. This improves the sealing reliability between the bushing 22 and the guide structure 25, and allows for flexible replacement of the sealing sleeve 27 when necessary. The guide structure 25 has a limiting step 28 at one end near the housing 21, wherein the limiting step 28 is directly opposite the bushing 22, and the bushing 22 is elastically connected to the limiting step 28 on its outer side by an elastic element, preferably a spring, so that the self-sealing cup achieves self-sealing through the rebound of the elastic element.

[0040] The limiting step 28 can also be a double-step structure, in which the small step faces the bushing 22, and the outer diameter of the large step is larger than that of the small step. At the same time, one end of the elastic element abuts against the large step, and the other end of the elastic element abuts against the outer ear ring on the outside of the bushing 22. This not only serves as an elastic connection, but also provides a limit limiting function when the battery 30 drives the housing 21 to move, by cooperating with the bushing 22 to prevent the guide structure 25 from excessively compressing the elastic element and shortening its service life.

[0041] In one embodiment, the first end is detachably connected to the base 29, and the suction nozzle 24 is located inside the base 29 to facilitate the disassembly, assembly, and maintenance of the suction nozzle.

[0042] In one embodiment, the housing 21 has a double-layer structure, including a transparent plastic layer 211 on the inner layer and a stainless steel layer 212 on the outer layer. The stainless steel layer 212 has a viewing window 205, which allows for easy viewing of the medium inside the housing cavity 201.

[0043] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. An electrolyte filling device for negative pressure battery formation, characterized in that, The device includes a manifold and multiple self-sealing cups. The manifold has multiple mounting slots arranged sequentially along its length on the same side. Each mounting slot mates with one of the multiple self-sealing cups and connects to the manifold's manifold cavity. The side wall of the manifold has an air pipe connector connecting to the manifold cavity. Each self-sealing cup includes: The housing has a cavity, and the housing has a first end and a second end opposite each other in the length direction, wherein the first end is opposite to the liquid injection port of the battery top cover and is provided with a suction nozzle communicating with the cavity, wherein the second end extends coaxially with a guide structure, and the guide structure is provided with a medium flow channel communicating with the cavity. A bushing is fixed to the mounting groove on the outside and is fitted onto the guide structure in a sliding fit. The bushing and the guide structure are elastically connected in the length direction. A top cover is located inside the manifold and connected to the guide structure. The top cover has a transition channel that connects to the medium flow channel. The opening of the transition channel is located on the side of the top cover. The top cover has a sealing structure that cooperates with the bushing on the outside of the opening.

2. The electrolyte filling device for battery negative pressure formation as described in claim 1, characterized in that, The busbar includes a main body and a cover plate. The mounting grooves are evenly distributed on one side of the main body, and the cover plate is detachably connected to the main body on the opposite side of the main body.

3. The electrolyte filling device for battery negative pressure formation as described in claim 2, characterized in that, The air pipe connector is a quick-connect connector, and there are multiple air pipe connectors, which are spaced apart along the length of the manifold on the side of the main body.

4. The electrolyte filling device for battery negative pressure formation as described in claim 1, characterized in that, The guide structure is a connecting shaft, and the guide structure is detachably connected to the second end. The top cover and the connecting shaft are detachably connected.

5. The electrolyte filling device for battery negative pressure formation as described in claim 4, characterized in that, The medium flow channel is tapered at one end near the cavity, and the outer diameter of the tapered shape gradually decreases from one end near the cavity to the other end.

6. The electrolyte filling device for battery negative pressure formation as described in claim 4, characterized in that, The opening is one or more, and when there are multiple openings, the openings are radially symmetrically distributed on the top cover.

7. The electrolyte filling device for battery negative pressure formation as described in claim 4, characterized in that, The sealing structure is a sloping flexible structure, and the end of the bushing away from the housing has an arc-shaped transition structure on its inner side that matches the sealing structure.

8. The electrolyte filling device for battery negative pressure formation as described in claim 4, characterized in that, The bushing is fitted with a sealing sleeve in a sealed manner. The sealing sleeve is slidably engaged with the guide structure. The guide structure has a limiting step at one end near the housing. The limiting step is directly opposite the bushing. The bushing is elastically connected to the limiting step on the outside by a spring.

9. The electrolyte filling device for battery negative pressure formation as described in claim 1, characterized in that, The first end is detachably connected to a base, and the suction nozzle is located inside the base.

10. The electrolyte filling device for battery negative pressure formation as described in claim 1, characterized in that, The shell has a double-layer structure, including an inner transparent plastic layer and an outer stainless steel layer, with a viewing window in the stainless steel layer.

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