Sealing nail and battery

Abstract

The utility model relates to a sealing nail and a battery. The sealing nail comprises a sealing nail body, the sealing nail body is provided with a first end face, a second end face and a peripheral wall, the first end face and the second end face are oppositely arranged, the peripheral wall is connected with the first end face and the second end face, a drainage channel is arranged in the sealing nail body, a liquid inlet of the drainage channel is formed in the first end face, and a liquid outlet of the drainage channel is formed in the second end face. A liquid outlet of the drainage channel is formed in the peripheral wall. The utility model relates to a battery which comprises a shell, a naked battery cell, a channel structure and a sealing nail, the utility model not only can solve the problem that the middle position of the pole piece of the battery cell is most difficult to infiltrate in the existing liquid supplementing process, but also is more convenient compared with the existing liquid injection and liquid supplementing.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a sealing nail and a battery. Background Art

[0002] At present, lithium-ion batteries have been widely used in portable electronic devices (such as mobile phones, computers) and electric vehicles. After continuous charging and discharging, the internal electrolyte of lithium-ion batteries will be lost to a certain extent. The reduction of electrolyte will bring about the consistency problem of battery cells, causing battery cell cycle attenuation, poor electrode wetting, and further causing electrode lithium deposition, affecting battery performance.

[0003] The above problems can be improved by supplementing electrolyte, but the existing method is simply to inject electrolyte into the battery through the injection hole, and the electrolyte cannot be directly targeted to the key position where the electrolyte is lacking in the battery cell, so the effect of improving battery performance is limited.

[0004] After searching, it was found that there are already disclosed solutions for improving the above-mentioned problems, such as China Patent No. 2023114686044, application date 2023-11-07, and patent name: Battery and battery injection and refilling method. Although the application includes a flow channel structure that can achieve the targeting of the electrolyte to the middle position of the battery cell, the flow channel structure includes an injection pipeline, a refilling pipeline and a closed structure, but because the closed structure is too complicated, that is, it has an initial state, an injection state and a refilling state, in the initial state, the injection outlet and the refilling outlet are both closed, in the injection state, the injection outlet is opened, in the refilling state, the refilling outlet is opened, and the injection outlet is closed, which makes the injection process in the battery production process and the refilling process after the battery has been used for a period of time too complicated. Utility Model Content

[0005] To this end, the technical problem to be solved by the utility model is to overcome the deficiencies caused by the overly complex closing structure in the existing flow channel structure, and to provide a sealing nail and a battery. The technical solution of the utility model can not only solve the pain point that the middle position of the electrode of the battery cell is the most difficult to infiltrate during the existing fluid replenishment, but also is more convenient than the existing fluid injection and fluid replenishment.

[0006] The utility model provides a sealing nail, including a sealing nail body, wherein the sealing nail body has a first end face and a second end face arranged opposite to each other and a peripheral wall connecting the first end face and the second end face, and a drainage channel is arranged in the sealing nail body, a liquid inlet of the drainage channel is formed on the first end face, and a liquid outlet of the drainage channel is formed on the peripheral wall.

[0007] In one embodiment of the utility model, the drainage channel includes a liquid inlet groove and at least one connecting channel, the groove of the liquid inlet groove serves as the liquid inlet of the drainage channel; each of the connecting channels is formed with an inlet on the side wall of the liquid inlet groove; and multiple connecting channels are connected to the liquid outlet.

[0008] In one embodiment of the utility model, a sedimentation tank is provided at the bottom of the liquid inlet tank.

[0009] In one embodiment of the present invention, the inlet of the connecting channel is closer to the first end surface than the liquid outlet.

[0010] In one embodiment of the present invention, the drainage channel further comprises a liquid outlet groove connected to the plurality of connecting channels, and the notch of the liquid outlet groove serves as the liquid outlet of the drainage channel.

[0011] In one embodiment of the present invention, the liquid outlet groove is arranged around the outer peripheral wall of the sealing nail body.

[0012] In an embodiment of the present invention, the sealing nail body is made of rubber material.

[0013] The utility model provides a battery, comprising a shell, a bare battery cell, a channel structure and the sealing nail, wherein the shell is provided with a liquid injection hole, the bare battery cell and the channel structure are both arranged in the shell, and the channel structure is located between the bare battery cell and the portion of the shell where the liquid injection hole is arranged;

[0014] The channel structure comprises a liquid replenishing part and a liquid injection part, wherein the liquid injection part has a first end and a second end, and the second end of the liquid injection part is connected to the top cover assembly; a liquid injection channel is arranged in the liquid injection part, and the liquid injection outlet of the liquid injection channel is arranged at the first end; the liquid injection inlet of the liquid injection channel is arranged at the second end, and the liquid injection inlet of the liquid injection channel is connected to the liquid injection hole;

[0015] The liquid replenishing member has a third end and a fourth end, the third end of the liquid replenishing member is in contact with the end surface of the bare battery cell; the fourth end of the liquid replenishing member is connected to the liquid injection member; a liquid replenishing channel is provided in the liquid replenishing member, the liquid replenishing outlet of the liquid replenishing channel is provided on the end surface of the third end of the liquid replenishing member, and the liquid replenishing outlet of the liquid replenishing channel is provided opposite to the preset position of the bare battery cell; the liquid replenishing inlet of the liquid replenishing channel is provided on the side wall of the liquid injection channel;

[0016] The sealing nail is arranged in the injection channel, and the sealing nail seals the injection outlet; the liquid outlet of the sealing nail is communicated with the liquid replenishment inlet; the liquid inlet of the sealing nail is communicated with the injection hole.

[0017] In one embodiment of the utility model, the injection inlet and the injection outlet are arranged relatively to each other along the axial direction of the injection hole; and a limiting portion abutting against the second end surface of the sealing pin is provided at the injection outlet of the injection piece.

[0018] In one embodiment of the present invention, the sealing pin and the injection channel are interference fit.

[0019] In one embodiment of the present invention, the top cover assembly includes a metal sealing nail, and the metal sealing nail seals the liquid injection hole.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] (1) A sealing nail of the utility model has a drainage channel machined on the sealing nail, so that the sealing nail not only has the function of sealing the liquid injection outlet, but also has the function of guiding the flow of electrolyte;

[0022] (2) A battery of the utility model, when liquid injection is required during the battery production process, utilizes a channel structure so that the electrolyte entering from the liquid injection hole flows into the outer shell through the liquid injection inlet, the liquid injection channel and the liquid injection outlet. After the liquid injection is completed, the liquid injection outlet is sealed by a sealing nail. In response to the need for liquid replenishment after the battery has been used for a period of time, the sealing nail can guide the flow of the electrolyte. The electrolyte can be guided into the liquid replenishment channel in advance during the battery production process, and the electrolyte injected from the liquid injection hole can be guided into the liquid replenishment channel after the battery has been used for a period of time. Then, the middle position of the bare battery cell is directly replenished through the liquid replenishment outlet, thereby solving the pain point that the middle position of the electrode of the battery cell is the most difficult to infiltrate during the existing liquid replenishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

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

[0025] Figure 2 for Figure 1 A partial cross-sectional view of

[0026] Figure 3 It is a partial cross-sectional view of a battery of the utility model when the liquid injection hole is not sealed;

[0027] Figure 4 This is a structural schematic diagram of a sealing nail of the utility model;

[0028] Figure 5It is a cross-sectional view of a sealing nail of the utility model;

[0029] Figure 6 It is a cross-sectional view of another embodiment of a sealing nail of the utility model;

[0030] Figure 7 This is a cross-sectional view of another embodiment of a sealing nail of the utility model.

[0031] Explanation of the markings in the specification: 1. Shell; 2. Top cover; 2-1. Liquid injection hole; 3. Insulating member; 4. Bare battery cell; 5. Metal sealing nail; 6. Liquid injection member; 6-1. Liquid injection outlet; 6-2. Liquid injection channel; 6-3. Liquid injection inlet; 6-4. Limiting portion; 7. Liquid replenishing member; 7-1. Liquid replenishing outlet; 7-2. Liquid replenishing channel; 7-3. Liquid replenishing inlet; 8-1. First end face; 8-2. Peripheral wall; 8-3. Second end face; 8-4. Liquid inlet; 8-5. Liquid outlet; 8-6. Drainage channel; 8-6-1. Liquid inlet trough; 8-6-2. Liquid outlet trough; 8-6-3. Connecting channel; 8-6-4. Inlet; 8-6-5. Sedimentation trough. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] Example 1

[0034] See also Figure 7 A sealing nail of the present embodiment includes a sealing nail body, the sealing nail body having a first end face 8-1 and a second end face 8-3 arranged opposite to each other and a peripheral wall 8-2 connecting the first end face 8-1 and the second end face 8-3, a drainage channel 8-6 ​​is arranged in the sealing nail body, a liquid inlet 8-4 of the drainage channel 8-6 ​​is formed on the first end face 8-1, and a liquid outlet 8-5 of the drainage channel 8-6 ​​is formed on the peripheral wall 8-2.

[0035] In this embodiment, the drainage channel 8-6 ​​is directly processed on the sealing nail, so that the sealing nail not only has the function of sealing the liquid injection outlet 6-1, but also has the function of guiding the flow of electrolyte. Specifically, after the sealing nail is used to block the liquid injection outlet 6-1, the electrolyte can be guided to flow into the liquid replenishing part 7 through the drainage channel 8-6; wherein, the sealing nail can be made of an elastic material that does not react with the electrolyte, such as rubber. Of course, the sealing nail can also be made of a plastic material that does not react with the electrolyte. There is no specific limit, as long as it can seal the liquid injection outlet and drain the electrolyte through the drainage channel 8-6.

[0036] It should be noted that the drainage channel 8-6 ​​can be L-shaped, W-shaped, or obliquely shaped, with no specific limitation, as long as one end of the drainage channel 8-6 ​​forms a liquid inlet 8-4 on the first end face, and the other end of the drainage channel 8-6 ​​forms a liquid outlet 8-5 on the peripheral wall 8-2; it should also be noted that the shape of the liquid inlet 8-4 is not limited, and can be circular, rectangular, waist-shaped, or annular, and the shape of the liquid outlet 8-5 is also not limited, and can be circular, rectangular, or waist-shaped; it should also be noted that the liquid outlet 8-5 can be arranged around the peripheral wall 8-2 for a week, or can be arranged around the peripheral wall 8-2 for less than a week, wherein when the liquid outlet 8-5 is arranged around the peripheral wall 8-2 for less than a week, at least one liquid outlet 8-5 can be provided, and specifically two or three can be provided, depending on the actual needs of the liquid infusion component.

[0037] In some embodiments, see Figure 4 and Figure 5 The drainage channel 8-6 ​​includes a liquid inlet groove 8-6-1 and at least one connecting channel 8-6-3, the groove of the liquid inlet groove 8-6-1 serves as the liquid inlet 8-4 of the drainage channel 8-6; each connecting channel 8-6-3 is formed with an inlet 8-6-4 on the side wall of the liquid inlet groove 8-6-1; and multiple connecting channels 8-6-3 are connected to the liquid outlet 8-5.

[0038] In this embodiment, the electrolyte enters at least one connecting channel 8-6-3 through the liquid inlet 8-4 and the liquid inlet groove 8-6-1, and then the electrolyte in at least one connecting channel 8-6-3 flows out from the liquid outlet 8-5. By providing at least one connecting channel 8-6-3, the electrolyte flowing into the drainage channel 8-6 ​​is increased. Since each connecting channel 8-6-3 is formed with an inlet 8-6-4 on the side wall of the liquid inlet groove 8-6-1, the speed at which the electrolyte flows into each connecting channel 8-6-3 is accelerated.

[0039] It should be noted that the number of connecting channels 8-6-3 can be one, two, three, four, five or six, and the specific number depends on the actual design.

[0040] It should also be noted that the liquid inlet groove 8-6-1 can extend along the length direction of the sealing nail body, or along a straight line direction intersecting the length direction of the sealing nail body, or along a curved line direction. The specific extension direction of the liquid inlet groove 8-6-1 is not limited, as long as the liquid inlet groove 8-6-1 is recessed from the first end surface 8-1 of the sealing nail body. The liquid inlet groove 8-6-1 here can be cylindrical or annular.

[0041] Furthermore, the drainage channel 8-6 ​​also includes a liquid outlet groove 8-6-2 connected to at least one connecting channel 8-6-3, and the notch of the liquid outlet groove 8-6-2 serves as the liquid outlet 8-5 of the drainage channel 8-6; the electrolyte converges to the liquid outlet groove 8-6-2 through multiple connecting channels 8-6-3, and then is discharged from the notch (liquid outlet 8-5) of the liquid outlet groove 8-6-2.

[0042] It should be noted that the liquid outlet groove 8-6-2 can be arranged around the outer peripheral wall 8-2 of the sealing nail body, and of course, it can also be arranged around the outer peripheral wall 8-2 of the sealing nail body for less than a circle; wherein, when the liquid outlet groove 8-6-2 is arranged around the outer peripheral wall 8-2 of the sealing nail body, the electrolyte can enter the liquid replenishment inlet 7-3 from any direction after entering the annular liquid outlet groove 8-6-2, which is convenient for positioning the liquid outlet 8-5 and the liquid replenishment inlet 7-3, and when the liquid outlet groove 8-6-2 is arranged around the outer peripheral wall 8-2 of the sealing nail body, more electrolyte flows into the liquid outlet groove 8-6-2.

[0043] Further, see Figure 4 and Figure 5 When the liquid outlet groove 8-6-2 can be arranged around the outer peripheral wall 8-2 of the sealing nail body, multiple connecting channels 8-6-3 are designed to be arranged at intervals along the circumference of the sealing nail body, so that the electrolyte flows uniformly from the liquid inlet groove 8-6-1 to the multiple connecting channels 8-6-3 around, achieving the purpose of uniform flow distribution. Specifically in this embodiment, multiple connecting channels 8-6-3 are arranged at equal intervals along the circumference of the sealing nail body.

[0044] In some embodiments, see Figure 5 The bottom of the liquid inlet groove 8-6-1 is provided with a sedimentation groove 8-6-5. The sedimentation groove 8-6-5 is designed to collect debris generated when the laser is used to clean the liquid injection hole 2-1, and to prevent the debris generated when the laser is used to clean the liquid injection hole 2-1 from entering the connecting channel 8-6-3.

[0045] In some embodiments, see Figure 6 The inlet 8-6-4 of the connecting channel 8-6-3 is closer to the first end face 8-1 than the liquid outlet 8-5. By designing the inlet 8-6-4 of the connecting channel 8-6-3 to be closer to the first end face 8-1 than the liquid outlet 8-5, that is, designing the connecting channel 8-6-3 to be inclined, the speed of the electrolyte passing through the connecting channel 8-6-3 can be accelerated.

[0046] It should be noted that the angle between the center line of the connecting channel 8-6-3 and the center line of the sealing nail is between 15-75 degrees, which can be 15 degrees, 30 degrees, 45 degrees, 52 degrees, 67 degrees or 73 degrees.

[0047] Example 2

[0048] As shown in 1, a battery of this embodiment includes a shell, a bare battery cell 4, a channel structure and the sealing nail described in Example 1, the shell is provided with a liquid injection hole 2-1, the bare battery cell 4 and the channel structure are both arranged in the shell, and the channel structure is located between the bare battery cell 4 and the portion of the shell where the liquid injection hole 2-1 is arranged.

[0049] Specifically, the outer shell includes a shell 1 and a top cover assembly, the top cover assembly seals the opening of the shell 1, the top cover assembly and the shell 1 form an accommodating cavity, and the top cover assembly has a liquid injection hole 2-1 extending along a third direction H; the channel structure is located between the top cover assembly and the end face of the lead-out ear in the bare battery cell 4; wherein the third direction H and the first direction are perpendicular to each other, and the first direction and the second direction L are perpendicular to each other.

[0050] Continue Figure 1 , and combined with Figure 3 The channel structure includes a liquid replenishing part 7 and a liquid injection part 6, the liquid injection part 6 has a first end and a second end, an injection channel 6-2 is arranged in the liquid injection part 6, the liquid injection outlet 6-1 of the liquid injection channel 6-2 is arranged at the first end; the liquid injection inlet 6-3 of the liquid injection channel 6-2 is arranged at the second end; the second end of the liquid injection part 6 is connected to the shell, and the liquid injection inlet 6-3 of the liquid injection channel 6-2 is connected to the liquid injection hole 2-1.

[0051] Specifically, the first end of the injection channel 6-2 may have a gap with the bare battery cell, or may contact the bare battery cell. Preferably, in order to speed up the injection speed, the second end of the injection channel 6-2 may be designed to have a gap with the bare battery cell.

[0052] Continue Figure 1 , and combined with Figure 3 The replenishing member 7 has a third end and a fourth end, and a replenishing channel 7-2 is arranged in the replenishing member 7. The third end face of the replenishing member 7 contacts the bare battery cell 4, wherein the contact may be direct contact or indirect contact, that is, a component capable of introducing electrolyte to the bare battery cell 4 is arranged between the third end face of the replenishing member 7 and the bare battery cell 4, or gap contact, wherein the gap is very small, that is, the electrolyte flowing from the gap to the shell can be ignored; the replenishing outlet 7-1 of the replenishing channel 7-2 is arranged on the third end face of the replenishing member 7, and the replenishing outlet 7-1 of the replenishing channel 7-2 is arranged opposite to the preset position of the bare battery cell 4, wherein the preset position is the middle position of the bare battery cell 4, and of course, the preset position may also be any position of the bare battery cell that requires replenishing; the fourth end of the replenishing member 7 is connected to the injection member 6, and the replenishing inlet 7-3 of the replenishing channel 7-2 is arranged on the side wall of the injection channel 6-2.

[0053] Specifically, in order to speed up the refilling speed and to evenly replenish the electrolyte to each layer of the electrode of the bare battery cell during refilling, it is designed that in the first direction, the width of the refilling outlet 7-1 is equal to or slightly smaller than the thickness of the bare battery cell 4. Furthermore, the center line of the refilling outlet 7-1 is designed to be coaxial with the center line of the bare battery cell 4, and in the second direction L, the length of the refilling outlet 7-1 is equal to 1 / 2-1 / 6 of the length of the bare battery cell 4. Specifically, the length of the refilling outlet 7-1 is equal to 1 / 3 or 1 / 2 or 1 / 4 of the length of the bare battery cell 4.

[0054] Continue Figure 1 , and combined with Figure 2 The sealing nail is arranged in the injection channel 6-2, and the sealing nail seals the injection outlet 6-1; the liquid outlet 8-5 of the sealing nail is connected to the liquid replenishment inlet 7-3; the liquid inlet 8-4 of the sealing nail is connected to the injection hole 2-1.

[0055] Specifically, since the sealing nail is set in the injection channel 6-2, the injection outlet 6-1 is blocked. Therefore, during the battery production process, the electrolyte can be first allowed to flow into the shell through the injection inlet 6-3, the injection channel 6-2 and the injection outlet 6-1 for injection. After the injection is completed, the sealing nail is set in the injection channel 6-2, and the sealing nail is used to block the injection outlet 6-1; then the drainage channel 8-6 ​​is used to guide the electrolyte into the shell. Of course, the sealing nail can also be set in the injection channel 6-2 before injection, and the sealing nail is used to block the injection outlet 6-1, and then the drainage channel 8-6 ​​is used to guide the electrolyte into the shell.

[0056] It should be noted that in order to make the sealing nail seal the liquid injection outlet 6-1 more effectively, the sealing nail and the liquid injection channel 6-2 are designed to have an interference fit. Specifically, the parts of the sealing nail located on both sides of the liquid outlet 8-5 and the liquid injection channel 6-2 are both interference fit.

[0057] In some embodiments, see Figure 2 As shown, the injection inlet 6-3 and the injection outlet 6-1 are arranged opposite to each other along the axis direction of the injection hole 2-1; the injection outlet 6-1 of the injection member 6 is provided with a limiting portion 6-4 which abuts against the second end surface 8-3 of the sealing pin.

[0058] In this embodiment, the sealing pin is arranged in the injection channel 6-2. When the second end face of the sealing pin abuts against the limiting portion 6-4, the liquid outlet 8-5 of the sealing pin is arranged opposite to the liquid replenishing inlet 7-3, thereby achieving the purpose of quickly positioning the sealing pin.

[0059] In some embodiments, see Figure 2 and Figure 3As shown, the top cover assembly includes a top cover sheet 2 and an insulating member 3, the insulating member 3 is located between the top cover sheet 2 and the bare battery cell 4, the insulating member 3 and the top cover sheet 2 are arranged in a close fit, and the channel structure and the insulating member 3 are integrally formed. By designing the channel structure and the insulating member 3 to be integrally formed, the production is faster. It should be noted that the channel structure and the insulating member 3 can also be detachably connected, such as by snapping or threading.

[0060] In some embodiments, see Figure 1 and Figure 2 As shown, the top cover assembly also includes a metal sealing nail 5, which seals the injection hole 2-1.

[0061] In this embodiment, since the injection hole 2-1 is sealed by the metal sealing nail 5, when the battery needs to be replenished after being used for a period of time, it is necessary to first damage the metal sealing nail 5 to open the injection hole 2-1, and then allow the electrolyte to flow through the injection hole 2-1, the liquid inlet 8-4, the drainage channel 8-6, the liquid outlet 8-5, the replenishment inlet 7-3 and the replenishment channel 7-2 in sequence, and then flow out from the replenishment outlet 7-1; after the replenishment is completed, use a new metal sealing nail 5 to seal the injection hole 2-1.

[0062] Of course, in order to avoid damaging the metal sealing nail 5, the purpose of directly replenishing the middle position of the bare battery cell can be achieved. By taking advantage of the fact that the bare battery cell no longer absorbs electrolyte when the battery is full of electrolyte, the drainage channel 8-6 ​​and the replenishment channel 7-2 can be filled with electrolyte in advance when the metal sealing nail 5 does not seal the injection hole 2-1. For such a battery with electrolyte in both the drainage channel 8-6 ​​and the replenishment channel 7-2, there is no need to damage the metal sealing nail 5. During use, the electrolyte in the drainage channel 8-6 ​​and the replenishment channel 7-2 can be used for replenishment.

[0063] In some embodiments, an injection valve (not shown in the figure) is provided at the injection hole 2-1, and the valve seat of the injection valve can directly seal the injection hole 2-1, or the valve seat cover of the injection valve can be provided on the injection hole 2-1; it should be noted that the injection valve can be switched, that is, when the injection valve is in an open state, the internal environment of the battery and the external environment of the battery are connected, and when the injection valve is in a closed state, the internal environment of the battery and the external environment of the battery are isolated.

[0064] In this embodiment, when fluid replenishment is needed, the injection valve is controlled to be in an open state, and electrolyte is injected into the injection valve to allow the electrolyte to flow out from the fluid replenishment outlet 7-1 through the liquid inlet 8-4, the drainage channel 8-6, the liquid outlet 8-5, the fluid replenishment inlet 7-3 and the fluid replenishment channel 7-2; after the fluid replenishment is completed, the injection valve is controlled to be in a sealed state.

[0065] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A sealing nail, characterized in that: The invention comprises a sealing nail body, wherein the sealing nail body comprises a first end face (8-1) and a second end face (8-3) which are arranged opposite to each other, and an outer peripheral wall (8-2) connecting the first end face (8-1) and the second end face (8-3); a drainage channel (8-6) is arranged in the sealing nail body; a liquid inlet (8-4) of the drainage channel (8-6) is formed on the first end face (8-1); and a liquid outlet (8-5) of the drainage channel (8-6) is formed on the outer peripheral wall (8-2).

2. A sealing nail according to claim 1, characterized in that: The drainage channel (8-6) comprises a liquid inlet groove (8-6-1) and at least one connecting channel (8-6-3); the groove opening of the liquid inlet groove (8-6-1) serves as a liquid inlet (8-4) of the drainage channel (8-6); each connecting channel (8-6-3) is formed with an inlet (8-6-4) on the groove side wall of the liquid inlet groove (8-6-1); and a plurality of connecting channels (8-6-3) are connected to the liquid outlet (8-5).

3. A sealing nail according to claim 2, characterized in that: The bottom of the liquid inlet tank (8-6-1) is provided with a sedimentation tank (8-6-5).

4. A sealing nail according to claim 2, characterized in that: The inlet (8-6-4) of the connecting channel (8-6-3) is closer to the first end surface (8-1) than the liquid outlet (8-5).

5. A sealing nail according to any one of claims 2 to 4, characterized in that: The drainage channel (8-6) further comprises a liquid outlet groove (8-6-2) which is in communication with at least one of the connecting channels (8-6-3), and a notch of the liquid outlet groove (8-6-2) serves as a liquid outlet (8-5) of the drainage channel (8-6).

6. A sealing nail according to claim 5, characterized in that: The liquid outlet groove (8-6-2) is arranged around the outer peripheral wall (8-2) of the sealing nail body.

7. A battery, characterized in that: Comprising a shell, a bare battery cell (4), a channel structure and a sealing nail as described in any one of claims 1 to 6, the shell being provided with a liquid injection hole (2-1), the bare battery cell (4) and the channel structure being both arranged in the shell, and the channel structure being located between the bare battery cell (4) and a portion of the shell where the liquid injection hole (2-1) is arranged; The channel structure comprises a liquid replenishing part (7) and a liquid injection part (6), wherein the liquid injection part (6) has a first end and a second end, and a liquid injection channel (6-2) is arranged in the liquid injection part (6), wherein the liquid injection outlet (6-1) of the liquid injection channel (6-2) is arranged at the first end; and the liquid injection inlet (6-3) of the liquid injection channel (6-2) is arranged at the second end; the second end of the liquid injection part (6) is connected to the housing, and the liquid injection inlet (6-3) is connected to the liquid injection hole (2-1); The liquid replenishing member (7) has a third end and a fourth end, a liquid replenishing channel (7-2) is arranged in the liquid replenishing member (7), the third end surface of the liquid replenishing member (7) is in contact with the bare battery cell (4), and the liquid replenishing outlet (7-1) of the liquid replenishing channel (7-2) is arranged on the third end surface of the liquid replenishing member (7), wherein the liquid replenishing outlet (7-1) of the liquid replenishing channel (7-2) is arranged at a preset position facing the bare battery cell (4); the fourth end of the liquid replenishing member (7) is connected to the liquid injection member (6), and the liquid replenishing inlet (7-3) of the liquid replenishing channel (7-2) is arranged on the side wall of the liquid injection channel (6-2); The sealing nail is at least partially disposed in the injection channel (6-2); the sealing nail seals the injection outlet (6-1); the liquid outlet (8-5) of the sealing nail is connected to the liquid replenishment inlet (7-3); and the liquid inlet (8-4) of the sealing nail is connected to the injection hole (2-1).

8. A battery according to claim 7, characterized in that: The injection inlet (6-3) and the injection outlet (6-1) are arranged opposite to each other along the axial direction of the injection hole (2-1); and a limiting portion (6-4) abutting against the second end surface (8-3) of the sealing pin is arranged at the injection outlet (6-1) of the injection piece (6).

9. A battery according to claim 7, characterized in that: The sealing pin and the liquid injection channel (6-2) are interference fit.

10. A battery according to claim 7, characterized in that: It also comprises a metal sealing nail (5), wherein the metal sealing nail (5) seals the liquid injection hole (2-1).

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