Process sealing nail for lithium battery

Abstract

The utility model provides a process sealing nail for a lithium battery. The process sealing nail for the lithium battery comprises a main body which defines an accommodating cavity and an air outlet channel communicated with the accommodating cavity; the inserting piece is connected to the main body, an air inlet, an air inlet channel and an air outlet are formed in the inserting piece, and the air outlet is constructed to be capable of communicating with the air outlet channel through the containing cavity; and the sealing piece is arranged in the containing cavity in a floatable mode along the axis of the air inlet channel, and the sealing piece is provided with a sealing position for sealing the air outlet and an exhaust position for communicating the air inlet channel with the air outlet channel. According to the technical scheme provided by the utility model, the problem that the qualified rate of the battery is relatively low due to the fact that the pre-lithium battery cannot exhaust in the infiltration process in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pre-lithium of battery cells, in particular to a process sealing nail for lithium batteries. Background Art

[0002] In recent decades, lithium-ion batteries have developed rapidly and have been quickly used in portable electronic products such as laptops and mobile phones. With the development of electronic products, new energy vehicles, and energy storage industries, human beings have higher and higher requirements for the energy density of lithium batteries. In recent years, people have become more and more eager to develop batteries with high energy density, so lithium-ion battery lithium replenishment technology has received more and more attention from scientific research institutions and enterprises.

[0003] When a lithium-ion battery is charged for the first time, lithium ions escape from the positive electrode and pass through the electrolyte and separator to the surface of the negative electrode, forming a solid electrolyte interface film on the surface of the negative electrode, which is the SEI (Solid Electrolyte Interface) film we are familiar with. The generation of such an interface film consumes a large amount of lithium ions. In addition, since the SEI film does not grow densely and the positive and negative electrode materials have large volume expansion and contraction during the cycle, part of the SEI film will dissolve in the electrolyte, resulting in the need to continuously generate SEI films on the surfaces of the positive and negative electrodes, which in turn requires continuous consumption of lithium ions in the battery. Therefore, during the first charge and discharge of the battery and subsequent charge and discharge cycles, it is necessary to continuously provide the battery with lithium ions to reduce the loss of active lithium in the lithium battery. Scientific research institutions and companies have begun to develop various pre-lithium technologies to replenish lithium in lithium batteries.

[0004] Summarizing various documents and patents, there are several types of pre-lithiation technologies at present: in-situ doping pre-lithiation, contact pre-lithiation, electrochemical pre-lithiation and chemical pre-lithiation. Among them, the use of lithium metal for electrochemical pre-lithiation of the negative electrode is a pre-lithiation strategy that is currently widely studied and adopted, including direct contact pre-lithiation, external short-circuit pre-lithiation, external power supply pre-lithiation and other methods. In the pre-lithiation process, lithium metal will be compounded on the negative electrode of the outermost battery cell of the battery for electrochemical pre-lithiation, and then placed in a high-temperature oven for infiltration after the electrolyte is injected once. In the above-mentioned infiltration process, due to the short circuit between lithium ions and the negative electrode of the battery cell, a half-battery is formed, which will be discharged at a low voltage during the infiltration process, which is equivalent to early formation. In this process, the pre-lithiation battery cell will produce gas. In the prior art, the process sealing nail is used to seal the injection port, which makes it difficult for the gas produced by the battery cell to be discharged. In this way, the gas will accumulate in the shell, thereby increasing the air pressure in the shell, which will cause the shell to deform, and ultimately cause the produced battery to be unqualified and reduce the qualified rate of battery production. Utility Model Content

[0005] The main purpose of the utility model is to provide a process sealing nail for lithium batteries, so as to solve the problem of low battery qualification rate caused by the inability to exhaust gas during the infiltration process of pre-lithium batteries in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a process sealing nail for a lithium battery, which includes: a main body, which defines a receiving chamber and an air outlet channel connected to the receiving chamber; an insert, which is connected to the main body, and is provided with an air inlet, an air inlet channel and an air outlet, and the air outlet is constructed to be connected to the air outlet channel through the receiving chamber; a sealing member, which is floatably arranged in the receiving chamber along the axis of the air inlet channel, and has a sealing position for sealing the air outlet and an exhaust position for connecting the air inlet channel and the air outlet channel.

[0007] Furthermore, part of the insert extends into the accommodating cavity, a sealing surface is provided on the insert, the sealing surface is located at the periphery of the air outlet, and the seal can be sealed with the sealing surface; or, the cross-sectional area of ​​the seal is larger than the area of ​​the air outlet.

[0008] Furthermore, the process sealing nail also includes an elastic member, which is located in the accommodating cavity, and two ends of the elastic member are respectively abutted or connected to the sealing member and the main body, so that the sealing member can be floated relative to the main body along the axial direction of the air inlet channel.

[0009] Furthermore, a first guide member is provided in the accommodating cavity, the first guide member is connected to the main body, and the first end of the elastic member is located on the outer periphery of the first guide member; and / or a second guide member is provided on the side of the sealing member away from the air outlet, the second guide member is connected to the sealing member, and the second end of the elastic member is sleeved on the outer periphery of the second guide member.

[0010] Furthermore, the main body includes an upper cover and a base sealed with the upper cover, the base and the upper cover are jointly arranged to form a receiving cavity, and the insert is passed through the base.

[0011] Furthermore, a fixing groove is provided on the upper cover, and the fixing groove is arranged along the circumference of the upper cover; a protrusion is provided on the base, and the protrusion is arranged along the circumference of the base; the protrusion is interference fit with the fixing groove.

[0012] Furthermore, a fixing groove is provided on the upper cover, and the fixing groove is arranged along the circumference of the upper cover; a protrusion is provided on the base, and the protrusion is arranged along the circumference of the base; and an outer wall of the protrusion is glued to an inner wall of the fixing groove.

[0013] Furthermore, the upper cover and / or the base are made of elastic material.

[0014] Further, the sealing element is made of an elastic material; and / or the inserting element is made of an elastic material.

[0015] Furthermore, the preset pressure required for the seal to switch from the sealing position to the exhaust position is greater than or equal to 1 KPa and less than or equal to 3 KPa.

[0016] By applying the technical solution of the utility model, the sealing member is floatingly arranged in the accommodating cavity of the main body, and the inserting member is inserted into the injection hole after the electrolyte of the battery is injected once, and the inserting member and the injection hole are sealed and matched. During the infiltration process of the battery in the high-temperature oven, when no gas is generated inside the battery, the sealing member covers the air outlet to seal the air outlet. In this way, the air inlet channel and the air outlet channel can be isolated, so that the outside air cannot enter the battery through the air outlet channel, the accommodating cavity and the air inlet channel in sequence, thereby preventing the outside air from entering the battery during the infiltration process. Entering the interior of the battery causes the electrolyte in the battery cell to fail; when the battery generates gas during the infiltration process, the internal air pressure of the battery increases, the gas enters the air inlet channel and generates a preset pressure on the seal, causing the seal to move along the axis of the air inlet channel in the direction away from the insert, thereby moving the seal away from the air outlet, and then the air inlet channel connects the accommodating chamber with the air outlet channel, so that the gas can be discharged through the air outlet, the accommodating chamber and the air outlet channel in sequence. When the gas is discharged, the internal pressure of the battery decreases, and the seal is switched to a sealing position that covers the air outlet and seals the air outlet. In this way, while ensuring that external air does not enter the interior of the battery, the gas generated inside the battery during the infiltration process can be discharged, thereby avoiding the problem of deformation of the battery shell due to excessive internal air pressure in the battery, thereby improving the qualified rate of batteries in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of an embodiment of a process sealing nail for a lithium battery of the utility model is shown;

[0019] Figure 2 Shows Figure 1 A cross-sectional view of a process sealing nail for a lithium battery.

[0020] The above drawings include the following reference numerals:

[0021] 10. Main body; 11. Air outlet channel; 12. Upper cover; 13. Base; 14. First guide member; 15. Protrusion; 20. Insert; 21. Air inlet; 22. Air outlet; 30. Sealing member; 31. Second guide member; 40. Elastic member. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that the process sealing nail for lithium batteries in the embodiment of the utility model is used for the high-temperature oven infiltration process after the lithium battery has completed the primary injection of electrolyte.

[0024] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a process sealing nail for lithium batteries. The process sealing nail for lithium batteries includes a main body 10, an insert 20 and a seal 30. The main body 10 defines a receiving cavity and an air outlet channel 11 connected to the receiving cavity; the insert 20 is connected to the main body 10, and the insert 20 is provided with an air inlet 21, an air inlet channel and an air outlet 22, and the air outlet 22 is constructed to be able to communicate with the air outlet channel 11 through the receiving cavity; the seal 30 is arranged in a floating manner along the axis of the air inlet channel in the receiving cavity, and the seal 30 has a sealing position for sealing the air outlet 22 and an exhaust position for connecting the air inlet channel and the air outlet channel 11.

[0025] In the above technical solution, the sealing member 30 is floated in the receiving cavity of the main body 10, and the inserting member 20 is inserted into the injection hole after the electrolyte of the battery is injected once, and the inserting member 20 is sealed with the injection hole. During the infiltration process of the battery in the high-temperature oven, when no gas is generated inside the battery, the sealing member 30 covers the gas outlet 22 to seal the gas outlet 22. In this way, the air inlet channel and the air outlet channel 11 can be isolated, so that the outside air cannot enter the battery through the air outlet channel 11, the receiving cavity and the air inlet channel in sequence, thereby preventing the outside air from entering the battery during the infiltration process. The electrolyte in the battery cell fails internally; when the battery generates gas during the infiltration process, the internal gas pressure of the battery increases, the gas enters the air inlet channel and generates a preset pressure on the seal 30, so that the seal 30 moves away from the insert 20 along the axial direction of the air inlet channel, so that the seal 30 is away from the gas outlet 22, and then the air inlet channel connects the accommodating chamber with the gas outlet channel 11, so that the gas can be discharged through the gas outlet 22, the accommodating chamber and the gas outlet channel 11 in sequence. When the gas is discharged, the internal pressure of the battery decreases, and the seal 30 is switched to a sealing position covering the gas outlet 22 and sealing the gas outlet 22. In this way, the gas generated inside the battery during the infiltration process can be discharged while ensuring that the external air does not enter the battery, thereby avoiding the problem of deformation of the battery shell due to excessive internal gas pressure of the battery, so as to improve the qualified rate of the battery in the production process.

[0026] Specifically, in the embodiment of the present invention, the sealing member 30 is a gasket.

[0027] like Figure 2 As shown, in an embodiment of the utility model, part of the insert 20 extends into the accommodating cavity, a sealing surface is provided on the insert 20, the sealing surface is located at the outer periphery of the air outlet 22, and the seal 30 can be sealed with the sealing surface; or, the cross-sectional area of ​​the seal 30 is larger than the area of ​​the air outlet 22.

[0028] Through the above arrangement, during the infiltration process, when no gas is generated inside the battery, the seal 30 is sealed with the sealing surface, or the seal 30 covers the air outlet 22, so that the air inlet channel is prevented from being connected to the accommodating cavity, thereby preventing the inside of the battery from being connected to the outside, and further keeping the inside of the battery airtight, so as to prevent outside air from entering the battery and causing failure of the electrolyte in the battery cell.

[0029] Preferably, in the embodiment of the present invention, the cross-sectional area of ​​the sealing member 30 is larger than the area of ​​the air outlet 22 .

[0030] like Figure 2 As shown, in an embodiment of the utility model, the process sealing nail also includes an elastic member 40, which is located in the accommodating cavity, and the two ends of the elastic member 40 are respectively abutted or connected to the sealing member 30 and the main body 10, so that the sealing member 30 can be floated relative to the main body 10 along the axial direction of the air inlet passage.

[0031] In the above technical solution, during the infiltration process, when no gas is generated inside the battery, the elastic member 40 is provided, and the two ends of the elastic member 40 are respectively in contact with the sealing member 30 and the main body 10. Under the elastic force of the elastic member 40, the sealing member 30 can cover the air outlet 22, so that the sealing member 30 and the sealing surface are sealed, so that the outside air cannot enter the battery through the air outlet channel 11, the accommodating cavity and the air inlet channel in sequence; when gas is generated during the infiltration process of the battery, the air pressure in the battery increases, and the gas enters the air inlet channel 11, and the air inlet channel 11 is closed. The seal 30 is pressed against the air inlet 22 and generates a preset pressure on the seal 30, so that the seal 30 moves away from the insert 20 along the axial direction of the air inlet channel, and compresses the elastic member 40, so that the seal 30 is away from the air outlet 22, and then the air inlet channel is connected with the air outlet channel 11, so that the gas can be discharged through the air outlet 22, the accommodating cavity and the air outlet channel 11 in sequence. When the gas is discharged, the pressure inside the battery decreases, and under the elastic force of the elastic member 40, the seal 30 is converted to a sealing position covering the air outlet 22 and sealing the air outlet 22. In this way, by using the process sealing nail for lithium batteries of this embodiment, the gas generated during the battery infiltration process can be discharged while ensuring that the external air does not enter the battery, thereby realizing the one-way ventilation function of the process sealing nail for lithium batteries.

[0032] Specifically, in the embodiment of the present invention, the elastic member 40 is a spring.

[0033] like Figure 2 As shown, in the embodiment of the present invention, a first guide member 14 is disposed in the accommodating cavity, the first guide member 14 is connected to the main body 10 , and a first end of the elastic member 40 is located at the periphery of the first guide member 14 .

[0034] Through the above arrangement, during the movement of the elastic member 40 , the first guide member 14 can guide the first end of the elastic member 40 to prevent the elastic member 40 from shaking violently during the movement, thereby preventing the elastic member 40 from detaching from the main body 10 .

[0035] Specifically, in the embodiment of the present invention, the first guide member 14 and the main body 10 are integrally formed.

[0036] Preferably, in the embodiment of the present invention, the first guide member 14 is a guide column.

[0037] like Figure 2 As shown, in the embodiment of the utility model, a second guide member 31 is provided on the side of the sealing member 30 away from the air outlet 22 , the second guide member 31 is connected to the sealing member 30 , and the second end of the elastic member 40 is sleeved on the outer periphery of the second guide member 31 .

[0038] Through the above arrangement, during the movement of the sealing member 30 , the second guide member 31 can guide the second end of the elastic member 40 to prevent the elastic member 40 from shaking violently during the movement, thereby preventing the elastic member 40 from detaching from the main body 10 .

[0039] Specifically, in the embodiment of the present invention, the second guide member 31 and the sealing member 30 are integrally formed.

[0040] Preferably, in the embodiment of the present invention, the second guide member 31 is a guide column, and the cross-sectional area of ​​the guide column is smaller than the cross-sectional area of ​​the sealing member 30 .

[0041] like Figure 2 As shown, in the embodiment of the utility model, the main body 10 includes an upper cover 12 and a base 13 sealed with the upper cover 12, the base 13 and the upper cover 12 are jointly arranged to form a receiving cavity, and the insert 20 is passed through the base 13. In this way, it is convenient to install the sealing member 30 and the elastic member 40 in the receiving cavity, thereby reducing the production difficulty of the process sealing nail for lithium batteries in this embodiment and improving the production efficiency.

[0042] Specifically, in the embodiment of the present invention, the insert 20 and the base 13 are integrally formed.

[0043] like Figure 2As shown, in the embodiment of the utility model, the upper cover 12 is provided with a fixing groove, which is arranged along the circumference of the upper cover 12, and the base 13 is provided with a protrusion 15, which is arranged along the circumference of the base 13, and the protrusion 15 is interference-fitted with the fixing groove. In this way, a sealed connection between the upper cover 12 and the base 13 can be achieved, and the upper cover 12 and the base 13 can be prevented from being separated during use, thereby preventing external air from entering the battery from the air outlet 22, so as to prevent the electrolyte inside the battery from failing due to external air.

[0044] Specifically, in the embodiment of the utility model, the fixing groove is an annular groove arranged along the circumference of the upper cover 12, and the protrusion 15 is an annular protrusion arranged along the circumference of the base 13, and the annular groove and the annular protrusion are interference fit.

[0045] In one embodiment, the fixing grooves are multiple grooves spaced apart along the circumference of the upper cover 12, and the protrusions 15 are multiple protrusions spaced apart along the circumference of the base 13. The multiple grooves correspond to the multiple protrusions one by one and are interference fit.

[0046] like Figure 2 As shown, in one embodiment, the upper cover 12 is provided with a fixing groove, which is arranged along the circumference of the upper cover 12, and the base 13 is provided with a protrusion 15, which is arranged along the circumference of the base 13, and the outer wall of the protrusion 15 is glued to the inner wall of the fixing groove. In this way, the upper cover 12 and the base 13 can be tightly connected. On the one hand, the upper cover 12 and the base 13 can be prevented from being separated, thereby preventing air from entering the battery through the air outlet 22; on the other hand, the upper cover 12 and the base 13 can be sealed, thereby preventing external air from entering the battery through the gap between the upper cover 12 and the base 13, the accommodating cavity, and the air outlet 22 in sequence.

[0047] Specifically, in the embodiment of the present invention, the upper cover 12 and the base 13 are bonded together by glue.

[0048] Specifically, in one embodiment, the upper cover 12 and / or the base 13 are made of elastic material. Thus, when the upper cover 12 and the base 13 are interference-fitted, the upper cover 12 and the base 13 can be elastically deformed, so that the upper cover 12 and the base 13 are sealed, thereby preventing the outside air from entering the battery through the gap between the upper cover 12 and the base 13, the accommodating cavity, and the air outlet 22 in sequence.

[0049] Specifically, in the embodiment of the present invention, the elastic material used to make the upper cover 12 and the base 13 includes but is not limited to existing elastic materials such as plastic and rubber.

[0050] Specifically, in the embodiment of the utility model, the sealing member 30 is made of an elastic material. Thus, when the sealing member 30 covers the air outlet 22 under the elastic force of the elastic member 40, the sealing member 30 can be elastically deformed and seal the air outlet 22, thereby preventing the outside air from entering the battery through the air outlet 22, and further preventing the outside air from entering the battery during the battery infiltration process and causing the electrolyte in the battery cell to fail.

[0051] Specifically, in the embodiment of the present invention, the elastic material used to make the sealing member 30 includes but is not limited to existing elastic materials such as plastic and rubber.

[0052] Specifically, in the embodiment of the present invention, the insert 20 is made of an elastic material. In this way, the insert 20 can be elastically deformed due to extrusion after being inserted into the liquid injection hole of the battery, so that the insert 20 and the liquid injection hole are sealed and matched, thereby preventing external air from entering the battery through the gap between the liquid injection hole and the insert 20.

[0053] Specifically, in the embodiment of the present invention, the elastic material used to make the insert 20 includes but is not limited to existing elastic materials such as plastic and rubber.

[0054] Specifically, in the embodiment of the utility model, the preset pressure required for the seal 30 to switch from the sealing position to the exhaust position is greater than or equal to 1KPa and less than or equal to 3KPa. In this way, when the gas pressure inside the battery is greater than or equal to the preset pressure due to the generation of gas, the seal 30 can be quickly switched from the sealing position to the exhaust position to exhaust the gas, thereby improving the exhaust efficiency; when the gas pressure inside the battery is less than or equal to the preset pressure after the gas is exhausted, the restoring force of the elastic member 40 will move the seal 30 to the sealing position.

[0055] Preferably, in the embodiment of the present invention, the preset pressure value is 3 KPa.

[0056] It should be noted that the lithium battery process sealing nail of the embodiment of the utility model achieves the following effects:

[0057] 1. The lithium battery process sealing nail of this embodiment has low manufacturing cost, simple structure, and is easy to manufacture. It is suitable for production line production without adding additional steps in the production process of the battery.

[0058] 2. The process sealing nail for lithium batteries in this embodiment is a one-way ventilation component, which can effectively discharge the gas generated by the lithium battery during the infiltration process from the inside of the battery, and can prevent external air from entering the battery, thereby avoiding affecting the battery cell performance.

[0059] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by floatingly setting the sealing member in the accommodating cavity of the main body, inserting the insert into the injection hole after the electrolyte of the battery is injected once, and making the insert and the injection hole seal and cooperate, during the infiltration process of the battery in the high-temperature oven, when no gas is generated inside the battery, the sealing member covers the air outlet to seal the air outlet, so that the air inlet channel and the air outlet channel can be isolated, so that the outside air cannot enter the battery through the air outlet channel, the accommodating cavity and the air inlet channel in sequence, and then Avoid outside air from entering the battery during the infiltration process, which may cause the electrolyte in the battery cell to fail; when the battery generates gas during the infiltration process, the internal air pressure of the battery increases, and the gas enters the air inlet channel and generates a preset pressure on the seal, so that the seal moves along the axis of the air inlet channel in a direction away from the insert, thereby moving the seal away from the air outlet, and then the air inlet channel connects the accommodating chamber with the air outlet channel, so that the gas can be discharged through the air outlet, the accommodating chamber and the air outlet channel in sequence. When the gas is discharged, the internal pressure of the battery decreases, and the seal is switched to a sealing position that covers the air outlet and seals the air outlet. In this way, while ensuring that external air does not enter the battery, the gas generated inside the battery during the infiltration process can be discharged, thereby avoiding the problem of deformation of the battery shell due to excessive internal air pressure in the battery, so as to improve the qualified rate of batteries in the production process.

[0060] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A process sealing nail for lithium battery, characterized in that: include: A main body (10) defines a receiving cavity and an air outlet passage (11) communicating with the receiving cavity; an insert (20) connected to the main body (10), the insert (20) being provided with an air inlet (21), an air inlet channel and an air outlet (22), the air outlet (22) being configured to be able to communicate with the air outlet channel (11) via the accommodating cavity; A sealing member (30) is arranged in a floating manner in the accommodating cavity along the axis of the air inlet passage, and the sealing member (30) has a sealing position for sealing the air outlet (22) and an exhaust position for connecting the air inlet passage and the air outlet passage (11).

2. The process sealing nail for lithium battery according to claim 1, characterized in that: A portion of the insert (20) extends into the accommodating cavity, and a sealing surface is provided on the insert (20), and the sealing surface is located at the outer periphery of the air outlet (22), and the sealing member (30) can be sealed with the sealing surface; or, the cross-sectional area of ​​the sealing member (30) is greater than the area of ​​the air outlet (22).

3. The process sealing nail for lithium battery according to claim 1, characterized in that: The process sealing pin also includes an elastic member (40), wherein the elastic member (40) is located in the accommodating cavity, and the two ends of the elastic member (40) are respectively abutted or connected to the sealing member (30) and the main body (10), so that the sealing member (30) can be floatably arranged relative to the main body (10) along the axial direction of the air inlet passage.

4. The process sealing nail for lithium battery according to claim 3, characterized in that: A first guide member (14) is provided in the accommodating cavity, the first guide member (14) is connected to the main body (10), and the first end of the elastic member (40) is located at the outer periphery of the first guide member (14); and / or, A second guide member (31) is provided on the side of the sealing member (30) facing away from the air outlet (22); the second guide member (31) is connected to the sealing member (30); and the second end of the elastic member (40) is sleeved on the outer periphery of the second guide member (31).

5. The process sealing nail for lithium battery according to any one of claims 1 to 4, characterized in that: The main body (10) comprises an upper cover (12) and a base (13) sealed with the upper cover (12); the base (13) and the upper cover (12) are jointly arranged to form the accommodating cavity; and the insert (20) is inserted through the base (13).

6. The process sealing nail for lithium battery according to claim 5, characterized in that: The upper cover (12) is provided with a fixing groove, which is arranged along the circumference of the upper cover (12); the base (13) is provided with a protrusion (15), which is arranged along the circumference of the base (13); the protrusion (15) is interference-fitted with the fixing groove.

7. The process sealing nail for lithium battery according to claim 5, characterized in that: The upper cover (12) is provided with a fixing groove, which is arranged along the circumference of the upper cover (12); the base (13) is provided with a protrusion (15), which is arranged along the circumference of the base (13); and the outer wall of the protrusion (15) is glued to the inner wall of the fixing groove.

8. The process sealing nail for lithium battery according to claim 5, characterized in that: The upper cover (12) and / or the base (13) are made of elastic material.

9. The process sealing nail for lithium battery according to any one of claims 1 to 4, characterized in that: The sealing member (30) is made of an elastic material; and / or the insert (20) is made of an elastic material.

10. The process sealing nail for lithium battery according to any one of claims 1 to 4, characterized in that: The preset pressure required for the sealing member (30) to switch from the sealing position to the exhaust position is greater than or equal to 1 KPa and less than or equal to 3 KPa.

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