Glue nail for lithium battery production process

Abstract

The utility model discloses a plastic nail for a lithium battery production process, which comprises a sealing part for sealing a liquid injection hole, a connecting part is arranged above the sealing part, the connecting part extends out of the liquid injection hole, a communicating air passage is arranged on the connecting part, the communicating air passage comprises an air inlet and an air outlet, and the air inlet is communicated with the air outlet. And when a negative pressure suction nozzle for performing formation negative pressure leakage detection on the battery is connected with the rubber nail, the air outlet is communicated with the negative pressure suction nozzle, and the air inlet is positioned outside the negative pressure suction nozzle and is communicated with the atmosphere. According to the plastic nail for the lithium battery production process, the structure is simple, on the premise that the liquid injection hole is sealed, if the plastic nail is not taken out during formation leakage detection, the side leakage detection is unqualified, and the phenomenon that the formation negative pressure side leakage detection is qualified due to the fact that the plastic nail is not taken out is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery production components, and in particular to a glue nail used in the lithium battery production process. Background Technology

[0002] In the production process of lithium batteries, after electrolyte injection, the batteries need to be sealed with glue pins to prevent leakage and to avoid the impact of moisture on the performance of the lithium batteries. The purpose of formation is to convert the active materials in the battery into substances with normal electrochemical function through the first small current charge, mainly by forming an effective passivation film at the negative electrode. During the first charge and discharge process of a liquid lithium-ion battery, the electrolyte reacts at the solid-liquid interface with the electrode, forming a "solid electrolyte interface" (SEI) film covering the surface of the electrode material. This passivation film is an electronic insulator in the electrochemical reaction of the lithium-ion battery, but it is an excellent conductor of lithium ions. Lithium ions can freely intercalate and exit through this passivation layer, which plays a very important role in the stability of the battery.

[0003] During the negative pressure test of the formation process, the glue pins need to be removed first, and then the negative pressure nozzle is used to test for leaks at the injection hole. However, the production line often has cases where glue pins are not removed before formation. The missing glue pins get stuck in the negative pressure nozzle, causing the negative pressure leak test to pass, but the actual liquid loss of the battery cell is too large. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a glue nail for the lithium battery production process.

[0005] This utility model proposes a glue nail for lithium battery production process, including a sealing part for sealing the injection hole, a connecting part above the sealing part, the connecting part extending out of the injection hole, and a communicating air passage on the connecting part, the communicating air passage including an air inlet and an air outlet. When a negative pressure suction nozzle for forming and leak testing of the battery is connected to the glue nail, the air outlet is connected to the negative pressure suction nozzle and the air inlet is located outside the negative pressure suction nozzle and is open to the atmosphere.

[0006] After the battery is filled with electrolyte, the filling hole is sealed by the sealing part. The extension part is located outside the filling hole. In theory, when the battery leaks on the negative pressure side during formation, the glue pin can be pulled out through the connecting part of the extending filling hole. If the glue pin is not pulled out on the production line, when the negative pressure leak is tested, the negative pressure nozzle contacts the connecting part of the glue pin, the air outlet is connected to the negative pressure nozzle, and the air inlet is located outside the negative pressure nozzle and is open to the atmosphere, which will cause the formation result to be unqualified. An alarm will be set before the formation starts. When the actual formation result is unqualified, the formation will be qualified due to the failure to pull out the glue pin, and the formation will be qualified without negative pressure, which will lead to a large amount of liquid loss during formation.

[0007] Preferably, the sealing part is made of an elastic material such as rubber, thereby increasing the sealing effect on the injection hole.

[0008] Preferably, the outer diameter of the sealing part is smaller than the outer diameter of the connecting part, and a stepped surface is formed between the sealing part and the connecting part.

[0009] When sealing the injection hole, the stepped surface abuts against the battery cover, thereby increasing the sealing performance.

[0010] Preferably, the end of the connecting portion away from the sealing portion has an air guide hole, and the outer side of the connecting portion has a side hole, which communicates with the air guide hole to form a connecting air passage. This facilitates the opening of the connecting air passage.

[0011] Preferably, multiple sets of side holes are provided, and the multiple sets of side holes are circumferentially distributed on the outer side of the connecting part.

[0012] When performing a negative pressure leak test if the adhesive nail is not removed, ensure that the negative pressure nozzle is connected to the atmosphere to prevent the negative pressure side leak test result from failing.

[0013] Preferably, the air guide hole is coaxial with the sealing part, thereby ensuring that the negative pressure nozzle is connected to the air outlet of the connecting airway.

[0014] Preferably, the outer diameter of the end of the connecting portion away from the sealing portion is larger than the outer diameter of the negative pressure suction nozzle.

[0015] This allows the end face of the connector to support the negative pressure nozzle when it is aligned with the injection hole, ensuring that the air inlet of the air passage is located outside the negative pressure nozzle and connected to the atmosphere.

[0016] Optionally, it includes a support portion and a middle portion, the middle portion being located between the support portion and the sealing portion, the side hole being formed on the middle portion, and the maximum outer diameter of the middle portion being larger than the inner diameter of the negative pressure suction nozzle.

[0017] Ensure that the air inlet of the air passage is located outside the negative pressure nozzle and is open to the atmosphere.

[0018] Preferably, the outer diameter of the support gradually increases from the end away from the middle part to the end closer to the middle part, the minimum outer diameter of the support is smaller than the inner diameter of the negative pressure nozzle, and the maximum outer diameter of the support is larger than the inner diameter of the negative pressure nozzle.

[0019] Ensure a seal between the negative pressure nozzle and the side of the support.

[0020] Preferably, the outer diameter of the middle portion gradually increases from the end closer to the sealing portion to the end farther away from the sealing portion.

[0021] While reducing the amount of material used, it facilitates the installation and removal of adhesive nails.

[0022] The proposed adhesive pin for lithium battery production has a simple structure. Under the premise of sealing the injection hole, if the adhesive pin is removed during the formation leak test, the side leak test will fail. This avoids the phenomenon that the formation negative pressure side leak test will pass due to the adhesive pin being removed.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 This diagram illustrates the relative position of the adhesive pin and the negative pressure suction nozzle during side leakage detection in this invention.

[0027] Figure 4 This is a diagram showing the relative position of the adhesive pin and the negative pressure suction nozzle during the side leakage detection in Example 2.

[0028] In the diagram: 1. Sealing part; 2. Connecting part; 20. Support part; 200. Air guide hole; 21. Middle part; 210. Side hole; 3. Connecting air passage; 30. Air inlet; 31. Air outlet; 4. Negative pressure nozzle. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example

[0030] like Figures 1-3 The illustrated adhesive nail for lithium battery production includes a sealing part 1 for sealing the injection hole, a connecting part 2 above the sealing part 1, the connecting part 2 and the sealing part 1 are integrally formed, the sealing part 1 and the connecting part 2 are made of rubber material, the connecting part 2 extends out of the injection hole, the connecting part 2 has a communicating air passage 3, the communicating air passage 3 includes an air inlet 30 and an air outlet 31, when the negative pressure suction nozzle 4 for forming negative pressure leak testing of the battery is connected to the adhesive nail, the air outlet 31 is connected to the negative pressure suction nozzle 4 and the air inlet 30 is located outside the negative pressure suction nozzle 4 and is open to the atmosphere.

[0031] After the battery is filled with electrolyte, the filling hole is sealed by the sealing part 1. The extension part is located outside the filling hole. When the battery is formed under negative pressure, theoretically, the glue pin can be pulled out through the connecting part 2 extending out of the filling hole. If the glue pin is not pulled out on the production line, when the negative pressure leak is detected, the negative pressure nozzle 4 contacts the connecting part 2 of the glue pin, the air outlet 31 is connected to the negative pressure nozzle 4, and the air inlet 30 is located outside the negative pressure nozzle 4 and is connected to the atmosphere, which will make the formation result unqualified. An alarm will be set before the formation starts. When the actual formation result is unqualified, the formation will be made qualified due to the failure to pull out the glue pin, and the formation will be made qualified under the condition of no negative pressure, which will result in a large amount of liquid loss during formation.

[0032] Preferably, the outer diameter of the sealing part 1 is smaller than the outer diameter of the connecting part 2, and a stepped surface is formed between the sealing part 1 and the connecting part 2. When sealing the liquid injection hole, the stepped surface abuts against the cover plate of the battery, thereby increasing the sealing performance.

[0033] Preferably, the end of the connecting part 2 away from the sealing part 1 has an air guide hole 200. When the negative pressure nozzle 4 performs detection, the negative pressure nozzle 4 communicates with the air guide hole 200. Preferably, the air guide hole 200 is coaxial with the sealing part 1. The outer surface of the connecting part 2 has a side hole 210, which communicates with the air guide hole 200 to form a connecting air passage 3. The side of the side hole 210 away from the air guide hole 200 is an air inlet 30, which facilitates the opening of the connecting air passage 3. Preferably, the diameter of the air guide hole 200 is larger than the outer diameter of the sealing part 1.

[0034] Preferably, multiple sets of side holes 210 are provided, and the multiple sets of side holes 210 are circumferentially distributed on the outer side of the connecting part 2.

[0035] When performing a negative pressure leak test if the adhesive nail is not removed, ensure that the negative pressure nozzle 4 is connected to the atmosphere, thereby ensuring that the negative pressure side leak test result is unqualified.

[0036] Preferably, the connecting part 2 is coaxial with the sealing part 1, thereby ensuring that the negative pressure suction nozzle 4 is connected to the air outlet 31 of the connecting airway 3.

[0037] Preferably, the device includes a support portion 20 and a middle portion 21. The middle portion 21 is located between the support portion 20 and the sealing portion 1. A side hole 210 is formed on the middle portion 21. The maximum outer diameter of the middle portion 21 is larger than the inner diameter of the negative pressure nozzle 4, and the side hole 210 is formed on the portion of the middle portion 21 near the connecting portion 2 relative to the maximum outer diameter. This ensures that the air inlet 30 of the connecting airway 3 is located outside the negative pressure nozzle 4 and is in communication with the atmosphere.

[0038] Preferably, the outer diameter of the end of the support portion 20 away from the sealing portion 1 is smaller than the inner diameter of the negative pressure suction nozzle 4. The outer diameter of the support portion 20 gradually increases from the end away from the middle portion 21 to the end closer to the middle portion 21. The minimum outer diameter of the support portion 20 is smaller than the inner diameter of the negative pressure suction nozzle 4, and the maximum outer diameter of the support portion 20 is larger than the inner diameter of the negative pressure suction nozzle 4. The side of the support portion 20 seals the negative pressure suction nozzle 4.

[0039] Preferably, the outer diameter of the middle portion 21 gradually increases from the end near the sealing portion 1 to the end away from the sealing portion 1. This facilitates the installation and removal of the adhesive pins while reducing material usage. Example

[0040] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the outer diameter of the end of the connecting part 2 away from the sealing part 1 is larger than the outer diameter of the negative pressure suction nozzle 4, and the connecting part 2 is cylindrical. This allows the end face of the connecting part 2 to support the negative pressure suction nozzle 4 when the negative pressure suction nozzle 4 is aligned with the injection hole, ensuring that the air inlet 30 of the connecting airway 3 is located outside the negative pressure suction nozzle 4 and is in communication with the atmosphere. Compared to Embodiment 1, this embodiment has a relatively simple structure.

[0041] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A type of adhesive nail used in the lithium battery manufacturing process, characterized in that, The device includes a sealing part (1) for sealing the injection hole, a connecting part (2) above the sealing part (1), the connecting part (2) extending out of the injection hole, and a communicating air passage (3) on the connecting part (2). The communicating air passage (3) includes an air inlet (30) and an air outlet (31). When the negative pressure suction nozzle (4) for forming the battery and leak testing is connected to the rubber nail, the air outlet (31) is connected to the negative pressure suction nozzle (4) and the air inlet (30) is located outside the negative pressure suction nozzle (4) and is open to the atmosphere.

2. The adhesive nail for lithium battery production according to claim 1, characterized in that, The outer diameter of the sealing part (1) is smaller than the outer diameter of the connecting part (2), and a stepped surface is formed between the sealing part (1) and the connecting part (2).

3. The adhesive nail for lithium battery production according to claim 1, characterized in that, The connecting part (2) has an air guide hole (200) at one end away from the sealing part (1), and a side hole (210) is opened on the outer side of the connecting part (2). The side hole (210) communicates with the air guide hole (200) to form a communicating air passage (3).

4. The adhesive nail for lithium battery production according to claim 3, characterized in that, Multiple sets of side holes (210) are provided, and the multiple sets of side holes (210) are circumferentially distributed on the outside of the connecting part (2).

5. The adhesive nail for lithium battery production according to claim 3, characterized in that, The air guide hole (200) is coaxial with the sealing part (1).

6. The adhesive nail for lithium battery production according to claim 3, characterized in that, The outer diameter of the end of the connecting part (2) away from the sealing part (1) is larger than the outer diameter of the negative pressure suction nozzle (4).

7. The adhesive nail for lithium battery production according to claim 3, characterized in that, It includes a support part (20) and a middle part (21), the middle part (21) being located between the support part (20) and the sealing part (1), the side hole (210) being formed on the middle part (21), and the maximum outer diameter of the middle part (21) being greater than the inner diameter of the negative pressure suction nozzle (4).

8. The adhesive nail for lithium battery production according to claim 7, characterized in that, The outer diameter of the support part (20) gradually increases from the end away from the middle part (21) to the end closer to the middle part (21). The minimum outer diameter of the support part (20) is smaller than the inner diameter of the negative pressure nozzle (4), and the maximum outer diameter of the support part (20) is larger than the inner diameter of the negative pressure nozzle (4).

9. The adhesive nail for lithium battery production process according to claim 7, characterized in that, The outer diameter of the middle part (21) gradually increases from the end closer to the sealing part (1) to the end farther away from the sealing part (1).

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