Sealing structure and battery cell

Abstract

The utility model discloses a sealing structure and cell wherein the sealing structure comprises a hole slot and a sealing assembly, the hole slot is provided with a countersink surface, the sealing assembly comprises a first sealing body, the first sealing body can be arranged in the hole slot in a sealing manner, a separation part is formed between the first sealing body and the countersink surface, and the first sealing body and the countersink surface are separated from each other. And the separating part can be used for separating the first sealing body from the sinking table surface so as to form a preset gap. According to the technical scheme of the utility model, the accuracy of sealing detection is improved.

Description

Technical Field

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

[0002] During the preparation of the battery cell, electrolyte needs to be added into the inner cavity of the shell through the injection hole on the battery cell shell. After the filling is completed, the injection hole needs to be sealed with a sealing structure to isolate the inside and outside of the battery shell.

[0003] The existing sealing structure generally includes a rubber nail and a sealing sheet. First, the rubber nail is driven into the injection hole, and then the sealing sheet is placed. The sealing sheet is fixed and sealed to the battery housing by laser welding. After the sealing sheet is installed, it is necessary to perform a sealing test on the sealing sheet to prevent problems such as cracks and leaks on the sealing sheet. There will be a certain gap between the sealing sheet and the internal boss of the injection hole. When performing the sealing test, the test gas (such as ammonia, Freon, helium, halogen gas, etc.) is filled into this gap, and the sealing effect of the sealing sheet is determined by checking whether there is gas leakage.

[0004] However, the existing sealing structure has the problem of low accuracy in sealing detection. Utility Model Content

[0005] The main purpose of the utility model is to provide a sealing structure, aiming to improve the accuracy of sealing detection.

[0006] To achieve the above-mentioned purpose, the utility model proposes a sealing structure, which includes a hole groove and a sealing assembly, wherein the hole groove has a sinking table surface, and the sealing assembly includes a first sealing body, which can be sealed in the hole groove, and a partition is formed between the first sealing body and the sinking table surface, and the partition can be used to separate the first sealing body and the sinking table surface to form a predetermined gap.

[0007] Optionally, the hole groove includes a first sub-hole and a second sub-hole that are connected, the first sub-hole is arranged on the side of the second sub-hole facing the external environment, the inner diameter of the first sub-hole is larger than the inner diameter of the second sub-hole to form the sinking table, and the first sealing body is sealed in the first sub-hole.

[0008] Optionally, the first sealing body has a first outer wall facing the sinking table surface, the first outer wall is provided with a first groove, and the first groove is recessed in a direction away from the sinking table surface to form the partition.

[0009] Optionally, a plurality of the first grooves are provided, and the plurality of the first grooves are arranged at intervals.

[0010] Optionally, the predetermined gap includes a first gap and a second gap, the first outer wall and the sinking table are spaced apart to form the first gap, the first groove has a bottom wall facing the sinking table, and the second gap is formed between the bottom wall and the sinking table.

[0011] Optionally, the height of the first gap is greater than or equal to one tenth of the depth of the first sub-hole; and / or,

[0012] The height of the second gap is less than or equal to one third of the depth of the first sub-hole.

[0013] Optionally, the first sub-hole has an inclined surface, the first sealing body has an abutting surface, and the abutting surface and the inclined surface are interfered with to limit the first sealing body from moving toward the sinking table surface; and or,

[0014] The first sealing body further comprises a second outer wall facing away from the second sub-hole, the second outer wall is provided with a second groove, and the second groove is recessed in a direction close to the sinking table surface.

[0015] Optionally, the sealing assembly further includes a second sealing body, and the second sealing body is sealed in the second sub-hole.

[0016] Optionally, the first outer wall is further provided with a third groove, and the third groove is arranged opposite to the second sub-hole and is recessed in a direction away from the second sub-hole to avoid the second sealing body.

[0017] The utility model also provides a battery cell, comprising:

[0018] The sealing structure mentioned above; and

[0019] The shell is provided with a receiving space for receiving electrolyte, the hole groove is provided in the shell and communicated with the receiving space, the electrolyte is injected into the receiving space through the hole groove, and the sealing component is sealed in the hole groove to seal the receiving space.

[0020] The sealing structure in a technical solution of an embodiment of the utility model is used to seal a hole groove, the hole groove has a sinking table, and the sealing structure includes a first sealing body, the first sealing body is sealed and arranged in the hole groove, and there is a gap between the first sealing body and the sinking table, and the gap is used to fill the detection gas, such as helium, halogen gas, etc., and the sealing effect of the first sealing body is determined by detecting whether the gas is leaking, so as to prevent the first sealing body from being poorly sealed. A partition is formed between the first sealing body and the sinking table, and the partition is used to ensure that a predetermined gap can be formed between the first sealing body and the sinking table, so as to prevent the gap between the first sealing body and the sinking table from being too small, thereby reducing the possibility that the electrolyte left on the sinking table blocks the gap between the first sealing body and the sinking table, and improving the accuracy of the sealing detection of the first sealing body, thereby ensuring the sealing effect of the first sealing body and improving the yield rate of the target product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A partial structural diagram of an embodiment of the battery cell of the utility model Figure 1 ;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0025] Figure 4 for Figure 1 A partial enlarged view of point C in the middle;

[0026] Figure 5 A partial structural diagram of an embodiment of the battery cell of the utility model Figure 2 ;

[0027] Figure 6 The structure of the first sealing body of the sealing assembly of the sealing structure of the utility model is schematically shown. Figure 1 ;

[0028] Figure 7 The structure of the first sealing body of the sealing assembly of the sealing structure of the utility model is schematically shown. Figure 2 ;

[0029] Figure 8A cross-sectional view of a first sealing body of a sealing assembly of a sealing structure of the utility model;

[0030] Fig. 9 It is a cross-sectional view of the sealing structure of the utility model.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0039] During the preparation of the battery cell, it is necessary to add electrolyte into the inner cavity of the shell through the injection hole on the battery shell. After the filling is completed, the injection hole needs to be sealed with a sealing structure to isolate the inside and outside of the battery shell. The existing sealing structure generally includes a glue nail and a sealing sheet. First, the glue nail is driven into the injection hole, and then the sealing sheet is placed. The sealing sheet is fixed and sealed to the battery shell by laser welding. After the sealing sheet is installed, it is necessary to perform a sealing test on the sealing sheet to prevent cracks, leaks and other problems from occurring in the sealing sheet. There will be a certain gap between the sealing sheet and the internal boss of the injection hole. When performing a sealing test, a test gas (such as ammonia, Freon, helium, halogen gas, etc.) is filled into this gap, and the sealing effect of the sealing sheet is determined by checking for leaks. However, when adding electrolyte, it is easy for electrolyte to remain inside the filling hole. These residual electrolytes will block the gap after crystallization, so that only a very small amount of test gas can be filled between the sealing plate and the filling hole, or even no test gas can be filled. The detection equipment cannot detect any leakage, causing the detection equipment to believe that the sealing plate is well sealed, but cannot reflect the actual sealing situation.

[0040] The utility model provides a sealing structure.

[0041] Reference Figures 1 to 5 , Figure 1 A partial structural diagram of an embodiment of the battery cell of the utility model Figure 1 , Figure 2 for Figure 1 A partial enlarged view of point A in the middle. Figure 3 for Figure 1 A partial enlarged view of point B in the middle. Figure 4 for Figure 1 A partial enlarged view of point C in the middle. Figure 5 A partial structural diagram of an embodiment of the battery cell of the utility model Figure 2 .

[0042] In an embodiment of the utility model, the sealing structure includes a hole groove and a sealing assembly 100, the hole groove has a countersunk table 201, the sealing assembly 100 includes a first sealing body 110, the first sealing body 110 can be sealed in the hole groove, and a partition 101 is formed between the first sealing body 110 and the countersunk table 201, and the partition can be used to separate the first sealing body 110 and the countersunk table 201 to form a predetermined gap 102.

[0043] A sealing structure in a technical solution of an embodiment of the utility model includes a hole groove and a sealing component 100, wherein the hole groove has a countersunk table 201, and the sealing component 100 includes a first sealing body 110, which is sealed in the hole groove, and there is a gap between the first sealing body 110 and the countersunk table 201, and the gap is used to fill with detection gas, such as helium, halogen gas, etc., and the sealing effect of the first sealing body 110 is determined by detecting whether the gas is leaking, so as to prevent the first sealing body 110 from being poorly sealed. A partition 101 is formed between the first sealing body 110 and the sinking table 201. The partition 101 ensures that a predetermined gap 102 can be formed between the first sealing body 110 and the sinking table 201, thereby preventing the gap between the first sealing body 110 and the sinking table 201 from being too small, thereby reducing the possibility that the electrolyte remaining on the sinking table 201 will block the gap between the first sealing body 110 and the sinking table 201, improving the accuracy of the sealing detection of the first sealing body 110, thereby ensuring the sealing effect of the first sealing body 110 and improving the yield rate of the target product.

[0044] Optionally, the hole groove includes a first sub-hole 210 and a second sub-hole 220 that are connected to each other, the first sub-hole 210 is arranged on the side of the second sub-hole 220 facing the external environment, the inner diameter of the first sub-hole 210 is larger than the inner diameter of the second sub-hole 220 to form a sinking table 201, and the first sealing body 110 is sealed in the first sub-hole 210.

[0045] Reference Figure 5In this embodiment, the hole groove is in the form of a countersunk hole, and the hole groove includes a first sub-hole 210 and a second sub-hole 220 that are connected. The inner diameter of the first sub-hole 210 is larger than the inner diameter of the second sub-hole 220 to form a countersunk table 201, and the first sealing body 110 is used to seal the first sub-hole 210. Specifically in this embodiment, the hole groove is a liquid injection hole of the battery cell 200. The second sub-hole 220 of the liquid injection hole is first sealed by the second sealing body 120, and then the first sub-hole 210 of the liquid injection hole is sealed by the first sealing body 110 to ensure a tight seal. The first sealing body 110 is fixed inside the first sub-hole 210 and can be fixed by welding, bonding, etc. to prevent the first sealing body 110 from protruding outside the injection hole, thereby playing a certain protective role for the first sealing body 110 and preventing the first sealing body 110 from being damaged by foreign objects, thereby ensuring the sealing effect of the first sealing body 110 on the first sub-hole 210 and reducing the possibility of electrolyte leakage inside the battery cell 200; on the other hand, arranging the first sealing body 110 inside the first sub-hole 210 also makes it more convenient to perform operations such as welding or bonding on the first sealing body 110, so that the first sealing body 110 is easy to fix.

[0046] Optionally, the first sealing body 110 has a first outer wall 111 facing the sinking surface 201 , and the first outer wall 111 is provided with a first groove 1111 , and the first groove 1111 is recessed in a direction away from the sinking surface 201 to form a partition 101 .

[0047] Reference Figure 6 and Figure 7 In this embodiment, a first groove 1111 is provided on the first outer wall 111 of the first sealing body 110 facing the sinking table 201. The first groove 1111 forms an uneven surface on the side of the first sealing body 110 facing the sinking table 201. The gap between the first sealing body 110 and the sinking table 201 at the first groove 1111 is larger, thereby reducing the possibility of the electrolyte blocking the gap between the first sealing body 110 and the sinking table 201, ensuring that there is sufficient space to pass the detection gas, and improving the accuracy of the sealing detection of the first sealing body 110. The partition 101 is formed by providing the first groove 1111 on the first outer wall 111, which has a simple structure, is easy to manufacture, and has low cost.

[0048] In another embodiment, the partition 101 can be a slender protrusion protruding from the first outer wall 111. The slender protrusion abuts against the sinking table 201, and the length of the slender protrusion can be adjusted to control the size of the gap between the first outer wall 111 and the sinking table 201, so that the gap between the first outer wall 111 and the sinking table 201 will not be too small, thereby reducing the possibility of electrolysis blocking the gap between the first sealing body 110 and the sinking table 201, and improving the accuracy of sealing detection of the first sealing body 110.

[0049] Optionally, the first groove 1111 is provided with a plurality of first grooves 1111 , and the plurality of first grooves 1111 are arranged at intervals.

[0050] Reference Figure 7 In this embodiment, the first outer wall 111 is provided with a plurality of first grooves 1111. By providing a plurality of first grooves 1111, the possibility of the electrolyte blocking the gap between the first outer wall 111 and the sink surface 201 is further reduced, thereby further ensuring the sealing effect of the first sealing body 110 on the first sub-hole 210, and improving the yield rate of the battery cell 200. The plurality of first grooves 1111 are arranged at intervals, and the plurality of first grooves 1111 are evenly distributed on the first outer wall 111 in a circular array, which is easy to process, reduces the difficulty of making the first sealing body 110, and ensures the strength and rigidity of the first sealing body 110 in all directions, thereby extending the service life of the first sealing body 110.

[0051] Optionally, the predetermined gap 102 includes a first gap 1021 and a second gap 1022 , the first outer wall 111 and the sinking table 201 are spaced apart to form the first gap 1021 , the first groove 1111 has a bottom wall facing the sinking table 201 , and the second gap 1022 is formed between the bottom wall and the sinking table 201 .

[0052] In this embodiment, by setting the first groove 1111, two gaps of different sizes are formed between the first sealing body 110 and the sinking table 201. The first gap 1021 is the gap between the first outer wall 111 and the sinking table 201, and the second gap 1022 is the gap between the bottom wall of the first groove 1111 and the sinking table 201. The second gap 1022 is larger than the first gap 1021. Even if problems such as manufacturing errors occur, the possibility that the gap cannot meet the inflation requirements of the detection gas is extremely low, thereby reducing the possibility that the electrolyte will block the gap between the first sealing body 110 and the sinking table 201, ensuring that there is sufficient space to pass the detection gas, thereby improving the accuracy of the sealing detection of the first sealing body 110.

[0053] Optionally, the height of the first gap 1021 is greater than or equal to one tenth of the depth of the first sub-hole 210; and / or,

[0054] The height of the second gap 1022 is less than or equal to one third of the depth of the first sub-hole 210 .

[0055] In this embodiment, the height of the first gap 1021, that is, the distance between the first outer wall 111 and the sinking table 201, is not less than one tenth of the depth of the first sub-hole 210, so as to avoid the gap between the first outer wall 111 and the sinking table 201 being too small. On the one hand, a gap of appropriate size is provided between the first outer wall 111 and the sinking table 201, thereby providing sufficient space for filling the detection gas to meet the needs of sealing detection; on the other hand, the electrolyte remaining on the sinking table 201 is less likely to block the gap between the first outer wall 111 and the sinking table 201 after crystallization, thereby ensuring the accuracy of sealing detection and improving the yield rate of the target product.

[0056] In the present embodiment, the height of the second gap 1022 is the distance between the bottom wall of the first groove 1111 and the sinking table 201. If the distance between the bottom wall and the sinking table 201 is too large, although the effect of the first groove 1111 in expanding the gap between the first outer wall 111 and the sinking table 201 will be improved, the thickness of the first sealing body 110 at the first groove 1111 will be thinner, affecting the strength and sealing effect of the first sealing body 110. Therefore, in the present embodiment, the distance between the bottom wall of the first groove 1111 and the sinking table 201 is not greater than one third of the depth of the first sub-hole 210.

[0057] Optionally, the first sub-hole 210 has an inclined surface, the first sealing body 110 has an abutting surface 113, and the abutting surface 113 and the inclined surface are interfered with to limit the first sealing body 110 from moving toward the sinking table surface 201; and or,

[0058] The first sealing body 110 further comprises a second outer wall 112 facing away from the second sub-hole 220 . The second outer wall 112 is provided with a second groove 1121 . The second groove 1121 is recessed in a direction close to the sink surface 201 .

[0059] Reference Figure 2 and Figure 8 In this embodiment, the first sub-hole 210 has an inclined surface, and the outer peripheral wall of the first sealing body 110 is provided with a contact surface 113. When the first sealing body 110 is placed in the first sub-hole 210, the contact surface 113 and the inclined surface abut against each other to limit the first sealing body 110, preventing the first outer wall 111 from contacting the sinking table 201, thereby ensuring that a gap is formed between the first outer wall 111 and the sinking table 201. The structure is simple and easy to implement. By adjusting the matching position between the abutting surface 113 and the inclined surface, the size of the gap between the first outer wall 111 and the sinking table 201 can be easily controlled.

[0060] Reference Figure 6 and Figure 8In this embodiment, the first sealing body 110 further has a second outer wall 112, and the second outer wall 112 is opposite to the first outer wall 111. The second outer wall 112 is provided with a second groove 1121 which is recessed in a direction close to the first outer wall 111. The second groove 1121 can facilitate the taking and placing of the first sealing body 110, which is more convenient when welding the first sealing body 110, and the second groove 1121 is conducive to reducing the weight of the first sealing body 110 and reducing the manufacturing cost of the first sealing body 110.

[0061] In this embodiment, the first sealing body 110 is made of metal material, such as aluminum, iron or aluminum alloy, and is connected to the periphery of the first sub-hole 210 by welding, and has a sealing effect, with a simple structure and easy implementation. Specifically in this embodiment, the first sealing body 110 is made of aluminum, which is similar to the shell material of the battery cell 200, reducing the manufacturing cost and welding difficulty.

[0062] Optionally, the sealing assembly 100 further includes a second sealing body 120 , and the second sealing body 120 is sealed in the second sub-hole 220 .

[0063] Reference Figure 1 In this embodiment, the sealing assembly 100 further includes a second sealing body 120, which is used to seal the second sub-hole 220, further improving the sealing effect of the sealing assembly 100 on the hole groove. Specifically in this embodiment, the possibility of leakage from the injection hole of the battery cell 200 is reduced, the yield rate of the battery cell 200 is improved, the service life of the battery cell 200 is extended, and the safety of the battery cell 200 is improved. The second sealing body 120 and the second sub-hole 220 can be sealed by bonding or interference fit. Specifically in this embodiment, the second sealing body 120 is made of elastic material, such as silicone or rubber, and the second sealing body 120 and the second sub-hole 220 are interference fit.

[0064] Optionally, the first outer wall 111 is further provided with a third groove 1112 , which is arranged opposite to the second sub-hole 220 and is recessed in a direction away from the second sub-hole 220 to avoid the second sealing body 120 .

[0065] Combination Figure 8 and Fig. 9In this embodiment, the first outer wall 111 is further provided with a third groove 1112. Due to manufacturing errors and assembly errors in the production process, the second sealing body 120 may not be completely assembled inside the second sub-hole 220. The second sealing body 120 may partially extend into the first sub-hole 210, which affects the assembly of the first sealing body 110. Therefore, in this embodiment, the third groove 1112 is provided on the first sealing body 110 to avoid the second sealing body 120 and avoid interference between the first sealing body 110 and the second sealing body 120. On the other hand, the third groove 1112 increases the gap between the first sealing body 110 and the sinking table 201, and also reduces the possibility of electrolyte crystallization blocking the gap between the first sealing body 110 and the sinking table 201, thereby improving the accuracy of sealing detection of the first sealing body 110.

[0066] Optionally, the depth of the third groove 1112 is greater than the depth of the first groove 1111 .

[0067] Reference Figure 8 In this embodiment, the depth of the third groove 1112 is greater than the depth of the first groove 1111, which provides sufficient avoidance space for the second sealing body 120, ensuring the smooth assembly of the first sealing body 110 and the second sealing body 120; and provides sufficient space for filling the detection gas, improving the accuracy of the sealing detection, thereby improving the yield rate of the battery cell 200.

[0068] The utility model also proposes a battery cell 200, comprising the above-mentioned sealing assembly 100 and a shell. The specific structure of the sealing assembly 100 refers to the above-mentioned embodiment. Since the battery cell 200 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Among them, the shell has a receiving space, and the hole groove is the injection hole of the battery cell 200. The electrolyte is injected into the interior of the receiving space through the injection hole, and then the hole groove is sealed by the sealing assembly 100 to prevent electrolyte leakage and improve the yield rate of the battery cell 200.

[0069] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sealing structure, characterized in that: The sealing structure includes a hole groove and a sealing component, the hole groove has a sinking table surface, and the sealing component includes a first sealing body, which can be sealed in the hole groove, and a partition is formed between the first sealing body and the sinking table surface, and the partition can be used to separate the first sealing body and the sinking table surface to form a predetermined gap.

2. The sealing structure according to claim 1, characterized in that: The hole groove includes a first sub-hole and a second sub-hole that are connected. The first sub-hole is arranged on the side of the second sub-hole facing the external environment. The inner diameter of the first sub-hole is larger than the inner diameter of the second sub-hole to form the sinking table. The first sealing body is sealed in the first sub-hole.

3. The sealing structure according to claim 2, characterized in that: The first sealing body has a first outer wall facing the sinking table surface. The first outer wall is provided with a first groove. The first groove is recessed in a direction away from the sinking table surface to form the partition.

4. The sealing structure according to claim 3, characterized in that: The first groove is provided with a plurality of the first grooves, and the plurality of the first grooves are arranged at intervals.

5. The sealing structure according to claim 3, characterized in that: The predetermined gap includes a first gap and a second gap. The first outer wall and the sinking table are spaced apart to form the first gap. The first groove has a bottom wall facing the sinking table. The second gap is formed between the bottom wall and the sinking table.

6. The sealing structure according to claim 5, characterized in that: The height of the first gap is greater than or equal to one tenth of the depth of the first sub-hole; and / or, The height of the second gap is less than or equal to one third of the depth of the first sub-hole.

7. The sealing structure according to claim 2, characterized in that: The first sub-hole has an inclined surface, the first sealing body has an abutting surface, and the abutting surface and the inclined surface interfere with each other to limit the first sealing body from moving toward the sinking table surface; and or, The first sealing body further comprises a second outer wall facing away from the second sub-hole, the second outer wall is provided with a second groove, and the second groove is recessed in a direction close to the sinking table surface.

8. The sealing structure according to claim 3, characterized in that: The sealing assembly further includes a second sealing body, which is sealed in the second sub-hole.

9. The sealing structure according to claim 8, characterized in that: The first outer wall is further provided with a third groove, which is arranged opposite to the second sub-hole and is recessed in a direction away from the second sub-hole to avoid the second sealing body.

10. A battery cell, characterized in that: include: The sealing structure according to any one of claims 1 to 9; as well as The shell is provided with a receiving space for receiving electrolyte, the hole groove is provided in the shell and communicated with the receiving space, the electrolyte is injected into the receiving space through the hole groove, and the sealing component is sealed in the hole groove to seal the receiving space.

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