Liquid injection assembly and liquid injection device

Abstract

The application relates to a liquid injection assembly and a liquid injection device. The liquid injection assembly comprises a liquid injection cup used for injecting electrolyte into a battery, the battery having a battery core cavity and a first liquid injection hole communicated with the battery core cavity, the liquid injection cup comprising a cup body and a liquid injection nozzle formed at the lower end of the cup body, the cup body having a receiving cavity for containing electrolyte, the liquid injection nozzle having a second liquid injection hole communicated with the receiving cavity, the electrolyte in the receiving cavity being capable of entering the battery core cavity through the second liquid injection hole and the first liquid injection hole; and a plugging piece arranged in the liquid injection cup, the plugging piece being capable of moving downward to a first position relative to the liquid injection cup; wherein the plugging piece in the first position is capable of sealing the second liquid injection hole to prevent the electrolyte in the receiving cavity from entering the battery core cavity, and the lower end of the plugging piece in the first position extends into the battery core cavity. The application can break the liquid film, thereby avoiding electrolyte splashing and improving product yield.

Description

Technical Field

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

[0002] In related technologies, the electrolyte injection process for lithium batteries typically uses an injection cup to inject the electrolyte. After injection, the injection port of the cup is sealed with a plug, and then the cup is lifted to complete the injection process. However, in actual production, at the end of injection, due to surface tension, a liquid film of electrolyte easily forms at the battery injection port. During subsequent battery movement, this liquid film is highly susceptible to rupture, causing electrolyte splashing, contaminating the battery surface, affecting product appearance, and increasing the defect rate. Utility Model Content

[0003] This application provides a liquid injection component and liquid injection device that can puncture the liquid film, thereby avoiding electrolyte splashing and improving product yield.

[0004] In a first aspect, the liquid injection assembly provided in the embodiments of this application includes:

[0005] An electrolyte injection cup is used to inject electrolyte into a battery, the battery having a cell cavity and a first injection port communicating with the cell cavity. The electrolyte injection cup includes a cup body and an injection nozzle formed at the lower end of the cup body. The cup body has a receiving cavity for containing electrolyte, and the injection nozzle has a second injection port communicating with the receiving cavity. The electrolyte in the receiving cavity can enter the cell cavity through the second injection port and the first injection port.

[0006] A sealing element is inserted into the injection cup, and the sealing element can move downward relative to the injection cup to a first position;

[0007] The sealing member in the first position can seal the second injection hole to prevent the electrolyte in the receiving cavity from entering the cell cavity, and the lower end of the sealing member in the first position extends into the cell cavity.

[0008] In some embodiments, the sealing element includes:

[0009] A connecting rod, the upper end of which is connected to the output end of a drive assembly, the drive assembly being used to drive the sealing element to move up and down; and

[0010] The plug is fixed to the lower end of the connecting rod.

[0011] In some embodiments, the plug includes a first connecting portion and a sealing portion formed at the lower end of the first connecting portion, the first connecting portion being connected to the connecting rod;

[0012] In this configuration, the first connecting portion of the sealing member in the first position is restricted outside the second injection hole, and the outer surface of the sealing portion of the sealing member in the first position abuts against the hole wall of the second injection hole.

[0013] In some embodiments, the sealing part is made of rubber.

[0014] In some embodiments, the sealing portion has a conical structure with a large diameter at the upper end and a small diameter at the lower end.

[0015] In some embodiments, the ratio of the length of the blocking portion to the length of the first connecting portion is 4 to 5.

[0016] In some embodiments, the plug is detachably connected to the connecting rod.

[0017] In some embodiments, the plug is a rubber plug, which engages with the connecting rod.

[0018] In some embodiments, the link includes:

[0019] The main body, with its upper end fixed to the output end of the driving component; and

[0020] A second connecting part is formed at the lower end of the body and threadedly connected to the plug, wherein the diameter of the second connecting part is smaller than the diameter of the body.

[0021] Secondly, the liquid injection device provided in the embodiments of this application includes the liquid injection component provided in any of the above embodiments.

[0022] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows: The electrolyte injection assembly and electrolyte injection device include: an injection cup for injecting electrolyte into a battery, the battery having a cell cavity and a first injection hole communicating with the cell cavity, the injection cup including a cup body and an injection nozzle formed at the lower end of the cup body, the cup body having a receiving cavity for receiving electrolyte, the injection nozzle having a second injection hole communicating with the receiving cavity, the electrolyte in the receiving cavity can enter the cell cavity through the second injection hole and the first injection hole; and a sealing member, which is disposed in the injection cup, and the sealing member can move downward relative to the injection cup to a first position; wherein, the sealing member in the first position can seal the second injection hole to prevent the electrolyte in the receiving cavity from entering the cell cavity, and the lower end of the sealing member in the first position extends into the cell cavity. According to the embodiments of this application, after the electrolyte injection is completed, the sealing member can be moved downward to the first position, which can not only seal the second injection hole and stop the electrolyte from being injected into the battery, but also the sealing member extending into the cell cavity can puncture the liquid film. After puncturing the liquid film, the injection cup and the battery can be separated, thereby avoiding electrolyte splashing caused by accidental rupture of the liquid film during subsequent battery movement, and improving product yield. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the liquid injection assembly according to an embodiment of this application;

[0024] Figure 2 for Figure 1 A schematic diagram of the sealing component structure of the injection assembly is shown;

[0025] Figure 3 for Figure 1 A cross-sectional view of the sealing component of the injection assembly shown.

[0026] Figure 4 for Figure 1 A cross-sectional view of the sealing component of the injection assembly shown.

[0027] Wherein: 1-Injection cup (11-Cup body (111-Receiving cavity), 12-Injection nozzle (121-Second injection hole)), 2-Sealing component (21-Connecting rod (211-Body body, 212-Second connecting part (2121-First flange section, 2122-Threaded section, 2123-Transition section, 2124-Second flange section, 2125-Frustum section)), 22-Plug (221-First connecting part (2211-Smooth hole section, 2212-Threaded hole section, 2213-First hole section, 2214-Second hole section, 2215-Third hole section), 222-Sealing part)), 3-Battery (31-Cell cavity, 32-First injection hole). Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0031] Please refer to Figure 1The electrolyte injection assembly in this embodiment includes an injection cup 1 and a sealing member 2. The injection cup 1 is used to inject electrolyte into a battery 3. The battery 3 has a cell cavity 31 and a first injection hole 32, which communicates with the cell cavity 31. The injection cup 1 includes a cup body 11 and an injection nozzle 12. The injection nozzle 12 is formed at the lower end of the cup body 11. The cup body 11 has a receiving cavity 111 for receiving electrolyte. The injection nozzle 12 has a second injection hole 121, which communicates with the receiving cavity 111. During injection, the injection cup 1 is fitted against the upper end of the battery 3, so that the second injection hole 121 aligns with the first injection hole 32. The electrolyte in the receiving cavity 111 can enter the cell cavity 31 through the second injection hole 121 and the first injection hole 32, thereby performing the injection. After injection is complete, the sealing member 2 is used to seal the second injection hole 121. The sealing element 2 is inserted into the injection cup 1, and the sealing element 2 can move downward relative to the injection cup 1. Figure 1 The first position shown is used to block the injection hole. The sealing member 2 in the first position can seal the second injection hole 121 to prevent electrolyte in the receiving cavity 111 from entering the cell cavity 31. Furthermore, the lower end of the sealing member 2 in the first position extends into the cell cavity 31, but the sealing member 2 does not contact the core inside the cell cavity 31. If a liquid film forms at the first injection hole 32 of the battery 3, the sealing member 2 can puncture the liquid film as its lower end extends into the cell cavity 31. It is understood that during the injection process, the sealing member 2 does not block the second injection hole 121, allowing electrolyte in the receiving cavity 111 to enter the cell cavity 31.

[0032] After electrolyte injection is completed in this embodiment, the sealing member 2 can be moved downwards to the first position. The sealing member 2 not only seals the second injection hole 121, preventing further injection of electrolyte into the battery 3, but also, the lower end of the sealing member 2 in the first position extends into the cell cavity 31, that is, below the first injection hole 32. Furthermore, the sealing member 2 in the first position does not contact the core inside the cell cavity 31. If a liquid film of electrolyte forms at the first injection hole 32 of the battery 3, the sealing member 2, during its downward movement to the first position, can not only puncture the liquid film but also avoid affecting the internal structure of the battery 3. After puncturing the liquid film, the injection cup 1 and the battery 3 are separated, preventing electrolyte splashing due to accidental rupture of the liquid film during subsequent battery 3 movement, thus improving product yield.

[0033] In some preferred embodiments, please refer to Figures 2 to 4The sealing component 2 includes a connecting rod 21 and a plug 22. The upper end of the connecting rod 21 is fixed to the output end of the drive assembly, and the plug 22 is fixed to the lower end of the connecting rod 21. Before electrolyte injection, the drive assembly drives the sealing component 2 upward to the reset position so that the sealing component 2 no longer blocks the second electrolyte injection hole 121, thereby allowing the electrolyte injection assembly to inject electrolyte into the battery 3. After electrolyte injection, the drive assembly drives the sealing component 2 downward to the first position to block the second electrolyte injection hole 121.

[0034] It should be noted that the drive component in this application is prior art. As an example, the drive component can be a cylinder, and the output end of the drive component is the piston rod of the cylinder. It can be set according to the actual situation and is not limited here.

[0035] In some preferred embodiments, please refer to Figures 1 to 4 The plug 22 includes a first connecting part 221 and a sealing part 222. The first connecting part 221 is connected to the lower end of the connecting rod 21, and the sealing part 222 is fixed to the lower end of the first connecting part 221. Please refer to [reference needed]. Figure 1 The first connecting portion 221 of the sealing member 2 in the first position is restricted outside the second injection hole 121, and the outer surface of the sealing portion 222 of the sealing member 2 in the first position abuts against the hole wall of the second injection hole 121.

[0036] In this embodiment, when the sealing member 2 moves to the first position, the first connecting part 221 is restricted outside the second liquid injection hole 121. That is to say, the first connecting part 221 cannot extend into the second liquid injection hole 121, thereby playing a certain limiting role on the sealing member 2, avoiding the sealing member 2 from extending too far into the cell cavity 31 and causing the sealing member 2 to contact the internal structure of the battery 3 such as the core, and further ensuring the product yield of the battery 3.

[0037] In one embodiment, the ratio of the length of the sealing portion 222 to the length of the first connecting portion 221 is 4 to 5. As an example, the ratio of the length of the sealing portion 222 to the length of the first connecting portion 221 can be, but is not limited to, 4:1 or 5:1. In this embodiment, the ratio of the length of the sealing portion 222 to the length of the first connecting portion 221 is 4 to 5, thereby ensuring that the sealing portion 222 has sufficient length to extend into the cell cavity 31 and puncture the liquid film.

[0038] In one embodiment, the sealing part 222 is made of rubber. In this embodiment, the sealing part 222 is made of a rubber material that is resistant to electrolyte corrosion, which not only reduces cost but also extends the service life of the sealing part 222.

[0039] In some embodiments, to simplify the structure, the material of the first connecting part 221 can be the same as that of the sealing part 222, making it easier to form a single piece. Alternatively, the material of the first connecting part 221 can be different from that of the sealing part 222, depending on the actual situation, which will not be elaborated here.

[0040] As one implementation method, please refer to Figures 1 to 3 The first connecting part 221 is a cylindrical structure, and the sealing part 222 is a conical structure. The upper end of the sealing part 222 has a large diameter, and the lower end of the sealing part 222 has a small diameter. This not only makes it easier for the sealing part 222 to enter the second injection hole 121 and the first injection hole 32, but also improves the sealing effect on the second injection hole 121. In addition, the lower end of the sealing part 222 is a pointed tip, which makes it easier to puncture the liquid film.

[0041] In other embodiments, the first connecting part 221 may also be a cylindrical structure, and the sealing part 222 may be a frustum structure, with the upper end of the sealing part 222 having a large diameter and the lower end of the sealing part 222 having a small diameter.

[0042] In some preferred embodiments, the plug 22 is detachably connected to the connecting rod 21. When the plug 22 is damaged due to prolonged use, it can be replaced according to its actual condition, without replacing the entire sealing component 2, thus reducing usage costs.

[0043] As one implementation method, the plug 22 is threadedly connected to the connecting rod 21, which facilitates installation and removal and ensures a reliable connection.

[0044] As an example, please refer to Figure 3 The connecting rod 21 includes a body 211 and a second connecting portion 212 that are integrally connected. The upper end of the body 211 is fixed to the output end of the drive assembly, and the second connecting portion 212 is formed at the lower end of the body 211. The second connecting portion 212 is threadedly connected to the plug 22. The diameter of the second connecting portion 212 is smaller than the diameter of the body 211, which not only effectively ensures the strength of the connecting rod 21, but also makes it easier to connect the connecting rod 21 and the plug 22.

[0045] In some examples, please refer to Figure 3The second connecting portion 212 includes a first flange section 2121 and a threaded section 2122 integrally formed. The threaded section 2122 is formed at the lower end of the first flange section 2121, and the diameter of the threaded section 2122 is smaller than the diameter of the first flange section 2121. External threads are formed on the outer periphery of the threaded section 2122. A stepped hole is formed at the upper end of the first connecting portion 221. The stepped hole includes a smooth hole section 2211 and a threaded hole section 2212 communicating with the lower end of the smooth hole section 2211. An internal thread is formed in the threaded hole section 2212 that is threadedly connected to the external threads. When assembling the plug 22 and the connecting rod 21, when the lower end of the first flange section 2121 abuts against the bottom of the hole in the smooth hole section 2211, please refer to... Figure 3 Once the plug 22 and connecting rod 21 are assembled, it is not only easy to assemble, but also the first flange section 2121 is partially housed in the light hole section 2211, which can improve the connection strength between the plug 22 and the connecting rod 21.

[0046] In one embodiment, the plug 22 is made of rubber, meaning it is a rubber plug. The connecting rod 21 includes an integral body 211 and a second connecting portion 212. The upper end of the body 211 is fixed to the output end of the drive assembly, and the second connecting portion 212 is formed at the lower end of the body 211. The diameter of the second connecting portion 212 is smaller than the diameter of the body 211, and the second connecting portion 212 engages with the plug 22. During assembly, the second connecting portion 212 is inserted into the plug 22 and engaged within it. Because the plug 22 is a rubber plug, it can undergo adaptive deformation during the insertion of the second connecting portion 212. After the second connecting portion 212 is inserted into the plug 22, the plug 22 can enclose the second connecting portion 212, securing it within the plug 22 and preventing the connecting rod 21 from separating from the plug 22 during normal use. When it is necessary to disassemble the plug 22 and the connecting rod 21, simply apply sufficient pulling force to the plug 22 to remove it from the connecting rod 21, which facilitates disassembly.

[0047] As an example, please refer to Figure 4The second connecting portion 212 includes a transition section 2123, a second flange section 2124, and a frustum section 2125, which are sequentially connected from top to bottom. The diameter of the second flange section 2124 is larger than the diameter of the transition section 2123, the diameter of the upper end of the frustum section 2125 is equal to the diameter of the second flange section 2124, and the diameter of the lower end of the frustum section 2125 is smaller than the diameter of the second flange section 2124. As an example, the diameter of the lower end of the frustum section 2125 can be equal to the diameter of the transition section 2123. The upper end of the first connecting portion 221 has a snap-fit ​​hole, which includes a first hole segment 2213, a second hole segment 2214, and a third hole segment 2215 connected sequentially from top to bottom. The first hole segment 2213 is a cylindrical hole that engages with the transition segment 2123; the second hole segment 2214 is a cylindrical hole that engages with the second flange segment 2124; and the third hole segment 2215 is a frustum-shaped hole that engages with the frustum-shaped segment 2125. In this embodiment, the lower end of the second connecting portion 212 is constructed in a frustum shape, making it easier to insert into the snap-fit ​​hole. When the second connecting portion 212 is inserted into the snap-fit ​​hole, the interface between the transition segment 2123 and the second flange segment 2124 abuts against the interface between the first hole segment 2213 and the second hole segment 2214, thereby snapping the second connecting portion 212 into the first connecting portion 221, preventing the second connecting portion 212 from dislodging from the snap-fit ​​hole during normal use.

[0048] It should be noted that in other embodiments, the plug and connecting rod can also be detachably connected in other ways, which can be set according to the actual situation, and will not be elaborated here.

[0049] It should be noted that the liquid filling cup 1 and battery 3 in this application are both prior art and can be set according to actual conditions, and are not limited here.

[0050] The liquid injection device of this application includes the liquid injection component provided in any of the above embodiments.

[0051] After electrolyte injection is completed in this embodiment, the sealing member 2 can be moved downwards to the first position. The sealing member 2 not only seals the second injection hole 121, preventing further injection of electrolyte into the battery 3, but also, the lower end of the sealing member 2 in the first position extends into the cell cavity 31, that is, below the first injection hole 32. Furthermore, the sealing member 2 in the first position does not contact the core inside the cell cavity 31. If a liquid film of electrolyte forms at the first injection hole 32 of the battery 3, the sealing member 2, during its downward movement to the first position, can not only puncture the liquid film but also avoid affecting the internal structure of the battery 3. After puncturing the liquid film, the injection cup 1 and the battery 3 are separated, preventing electrolyte splashing due to accidental rupture of the liquid film during subsequent battery 3 movement, thus improving product yield.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments merely illustrate preferred implementations of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A liquid injection assembly, characterized by, include: An electrolyte injection cup is used to inject electrolyte into a battery. The battery has a cell cavity and a first injection port communicating with the cell cavity. The electrolyte injection cup includes a cup body and an injection nozzle formed at the lower end of the cup body. The cup body has a receiving cavity for containing electrolyte. The injection nozzle has a second injection port communicating with the receiving cavity. The electrolyte in the receiving cavity can enter the cell cavity through the second injection port and the first injection port. and A sealing element is inserted into the injection cup, and the sealing element can move downward relative to the injection cup to a first position; The sealing member in the first position can seal the second injection hole to prevent the electrolyte in the receiving cavity from entering the cell cavity, and the lower end of the sealing member in the first position extends into the cell cavity.

2. The liquid injection assembly of claim 1, wherein, The sealing component includes: A connecting rod, the upper end of which is connected to the output end of a drive assembly, the drive assembly being used to drive the sealing element to move up and down; and The plug is fixed to the lower end of the connecting rod.

3. The liquid injection assembly of claim 2, wherein, The plug includes a first connecting portion and a sealing portion formed at the lower end of the first connecting portion, the first connecting portion being connected to the connecting rod; In this configuration, the first connecting portion of the sealing member in the first position is restricted outside the second injection hole, and the outer surface of the sealing portion of the sealing member in the first position abuts against the hole wall of the second injection hole.

4. The injection assembly as described in claim 3, characterized in that, The sealing part is made of rubber.

5. The injection assembly as described in claim 3, characterized in that, The sealing part has a conical structure with a large diameter at the top and a small diameter at the bottom.

6. The injection assembly as described in claim 3, characterized in that, The ratio of the length of the sealing part to the length of the first connecting part is 4 to 5.

7. The injection assembly as described in claim 2, characterized in that, The plug is detachably connected to the connecting rod.

8. The injection assembly as described in claim 7, characterized in that, The plug is a rubber plug, and the plug is engaged with the connecting rod.

9. The injection assembly as described in claim 7, characterized in that, The link includes: The main body, with its upper end fixed to the output end of the driving component; and A second connecting part is formed at the lower end of the body and threadedly connected to the plug, wherein the diameter of the second connecting part is smaller than the diameter of the body.

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

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