Sealing cover structure and single battery

Abstract

The utility model discloses a sealing cover structure and a single battery. The sealing cover structure comprises a cover plate, a sealing assembly and a pole assembly, specifically, the cover plate is provided with an appearance surface and a working surface which are oppositely arranged in the thickness direction, a pole hole penetrating through the working surface and the appearance surface is formed in the cover plate, and the working surface is used for facing the battery cell assembly; the sealing assembly is arranged on the working surface; the pole assembly and the cover plate clamp the sealing assembly and penetrate through the pole hole. According to the sealing cover structure disclosed by the utility model, along with the rise of the internal pressure of the configured single battery, the sealing performance of the sealing assembly and the sealing cover structure by pressing the pole assembly and the cover plate becomes more excellent.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a cover structure and single battery. BACKGROUND

[0002] Single battery usually includes three parts of shell, cover and battery core, the battery core is contained in the shell, and the cover is arranged on the shell and seals the shell. In most cases, the cover is connected with the shell through its edge area, which facilitates the processing, but causes new problems:

[0003] In the design of lightweight battery, especially button battery, the cover has the function of leading out the positive and negative poles. In order to realize the insulation between the positive and negative poles, the cover must not be a complete structure formed integrally. With the working of the battery core, the internal pressure of the single battery rises, the edge area of the cover is fixed by the shell and does not change obviously, and the central area of the cover bulges outward, the air tightness of the cover structure decreases, and even causes the phenomenon of liquid leakage. SUMMARY

[0004] One purpose of the utility model is to provide a cover structure and single battery. It aims to solve the technical problem that the air tightness of the cover plate deteriorates with the rise of the internal pressure of the battery during the working process of the single battery.

[0005] To achieve the above purpose, the utility model provides a scheme: a cover structure, the cover structure includes a cover plate, a sealing assembly and a pole assembly. Specifically, the cover plate has an appearance surface and a working surface arranged oppositely in the thickness direction of the cover plate, the cover plate is formed with a pole hole penetrating the working surface and the appearance surface, and the working surface is used for facing the battery core assembly; the sealing assembly is arranged on the working surface; the pole assembly clamps the sealing assembly with the cover plate, and penetrates the pole hole.

[0006] In some embodiments, the cover plate includes a first part and a second part, the pole hole is formed in the first part, the second part is arranged around the first part, the second part extends along the thickness direction of the cover plate, and the side surface of the second part is used for connecting with the shell of the single battery.

[0007] In some embodiments, the cover plate further includes a third part and a fourth part, the third part is arranged around the first part, the opposite ends of the fourth part are connected with the third part and the second part respectively, the third part, the fourth part and the second part are arranged to form a groove, and the opening direction of the groove is the same as the direction of the appearance surface.

[0008] In some embodiments, the first part and the third part are connected by an arc; and / or, the third part and the fourth part are connected by an arc.

[0009] In some embodiments, the pole assembly includes an upper pole and a lower pole; the lower pole includes a column and a flange connected to each other, the flange is clamped with the sealing assembly of the cover plate, the column penetrates the pole hole, the upper pole is connected with the column, and the upper pole and the lower pole clamp the sealing assembly.

[0010] In some embodiments, the inner diameter of the sealing assembly is D1, the outer diameter of the upper pole is D2, and D1 < D2.

[0011] In some embodiments, the upper pole is formed with a clamping groove, and the column is inserted into the clamping groove.

[0012] In some embodiments, the outer diameter of the upper pole is D2, the hole diameter of the pole hole is D3, and D2 < D3.

[0013] In some embodiments, the cover plate includes a first part and a third part, the pole hole is formed in the first part, the third part is arranged around the first part, the third part extends along the thickness direction of the cover plate, and the third part and the first part surround to form a containing space, and the flange and the sealing assembly are accommodated in the containing space.

[0014] In some embodiments, the outer diameter of the flange is D4, the inner diameter of the third part is D5, and D4 < D5; and / or

[0015] The inner diameter of the third part is D5, the outer diameter of the sealing assembly is D6, and D6 < D5.

[0016] In some embodiments, the sealing assembly includes a sealing rubber ring and an insulating sheet, the sealing rubber ring and the insulating sheet are alternately sleeved, and the projection of the sealing rubber ring in the thickness direction of the cover plate falls on the projections of the flange and the cover plate at the same time.

[0017] To achieve the above-mentioned purpose, another scheme of the utility model provides a single battery, the single battery includes a cover assembly, a shell and a cell assembly. Specifically, the cover structure is any one of the cover structures described above, and the cover structure covers the shell; the cell assembly is accommodated in the shell and is electrically connected with the pole assembly in the cover structure.

[0018] In some embodiments, the single battery includes a clamping block, the clamping block protrudes from the inner surface of the shell, and the cover plate in the cover structure abuts against the clamping block.

[0019] In some embodiments, the cell assembly includes a core package, a first pole piece and a second pole piece, the core package is electrically connected with the first pole piece and the second pole piece respectively, the first pole piece is connected with the pole assembly, and the second pole piece is clamped between the cover structure and the shell.

[0020] The utility model has the advantages of:

[0021] The cover plate has an external surface and a working surface arranged opposite each other in its thickness direction. A terminal hole is formed on the cover plate, penetrating both the working surface and the external surface. The working surface faces the cell assembly. A sealing assembly is disposed on the working surface. The terminal assembly and the cover plate clamp the sealing assembly, and the terminal hole is also present. In this invention, the cover plate and terminal assembly of the sealing structure serve as the two output terminals of the configured single-cell battery. During the use of the single-cell battery, as the cell assembly operates, the internal pressure of the single-cell battery increases. The cover plate is fixed by the casing, and its structure does not change significantly. However, the terminal assembly is pushed outward by the pressure difference between the inner and outer sides of the sealing structure, tending to bulge away from the cell assembly. This results in the sealing assembly being compressed, and the connection between the terminal assembly and the sealing assembly, as well as between the cover plate and the sealing assembly, becomes tighter.

[0022] In existing sealing structures, as the internal pressure of the individual battery cells increases, the central area of ​​the sealing structure bulges, gaps appear between the multiple sub-components constituting the sealing structure, and the airtightness of the sealing structure decreases. However, in the sealing structure provided by this invention, as the internal pressure of the individual battery cells increases, the terminal assembly and the cover plate press together to seal the assembly, resulting in superior sealing performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the sealing structure provided in this embodiment of the utility model;

[0025] Figure 2 This is an exploded structural diagram of the sealing structure provided in this embodiment of the utility model;

[0026] Figure 3 This is a cross-sectional schematic diagram of the sealing structure provided in an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram showing the cooperation relationship between the sealing component, the cover plate, and the pole component provided in another embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the overall structure of a single battery provided in an embodiment of this utility model;

[0029] Figure 6 This is an exploded structural diagram of a single battery provided in an embodiment of the present invention;

[0030] Figure 7 This is a cross-sectional schematic diagram of a single battery provided in an embodiment of this utility model;

[0031] Figure 8 yes Figure 7 A magnified view of a portion of region A in the middle.

[0032] Explanation of icon numbers:

[0033] 10. Cover structure; 11. Cover plate; 11a. Outer surface; 11b. Working surface; 111. Terminal hole; 112. First part; 113. Second part; 114. Third part; 115. Fourth part; 116. Accommodation space; 12. Sealing assembly; 121. Sealing ring; 122. Insulating sheet; 13. Terminal assembly; 131. Upper terminal; 1311. Slot; 132. Lower terminal; 1321. Column; 1322. Flange; 20. Housing; 30. Cell assembly; 31. Core pack; 32. First electrode; 33. Second electrode; 40. Locking block. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the overall structure of the capping structure 10 provided in this embodiment of the utility model; Figure 2 This is an exploded view of the sealing structure 10 provided in this embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the sealing structure 10 provided in this embodiment of the utility model.

[0036] To address the technical problem of deterioration in the airtightness of the sealing cap due to increased internal pressure during use of existing single-cell batteries, this utility model discloses a sealing cap structure 10. The sealing cap structure 10 includes a cover plate 11, a sealing assembly 12, and an electrode post assembly 13. Specifically, the cover plate 11 has an external surface 11a and a working surface 11b disposed opposite each other in its thickness direction. An electrode post hole 111 is formed on the cover plate 11, penetrating both the working surface 11b and the external surface 11a. The working surface 11b faces the cell assembly 30. The sealing assembly 12 is disposed on the working surface 11b. The electrode post assembly 13 and the cover plate 11 clamp the sealing assembly 12, and the electrode post assembly 13 passes through the electrode post hole 111.

[0037] The terminal assembly 13, cover plate 11, and sealing assembly 12 can each be a one-piece molded structure or assembled from multiple parts. The working surface 11b and appearance surface 11a defined in this embodiment are only for illustrative purposes; in practical applications, the appearance surface 11a may also carry the operating current of a single battery cell. The sealing assembly 12 can be made of materials such as polycarbonate, polyester, polypropylene, or polyvinyl chloride. The above descriptions are common knowledge to those skilled in the art and will not be repeated hereafter.

[0038] In this embodiment, a sealing component 12 is clamped between the terminal post assembly 13 and the working surface 11b of the cover plate 11. The gap between the terminal post assembly 13 and the cover plate 11 is sealed by the sealing component 12. At the same time, the sealing component 12 separates the cover plate 11 and the terminal post assembly 13, completing the seal and also achieving insulation between the cover plate 11 and the terminal post assembly 13, electrically dividing the cover structure 10 into two output ends: the cover plate 11 and the terminal post assembly 13. When the single battery configured in the cover structure 10 of this embodiment is in working condition, as the cell inside the single battery heats up and generates gas, the internal pressure of the single battery increases. The outer edge of the cover plate 11 is fixed by the battery casing 20 and no significant structural change occurs. However, the side of the terminal post assembly 13 closer to the cell is subjected to greater pressure. Driven by the pressure difference, it tends to move away from the cell. That is, the working surface 11b of the terminal post assembly 13 and the cover plate 11 comes into close contact with and squeezes the sealing component 12, which actually makes the sealing effect between the terminal post assembly 13 and the cover plate 11 better.

[0039] In existing technologies, the airtightness between the various components of a sealing cap depends on the connection strength between the seal and each component. As the internal pressure of a single battery cell increases, the central region of the sealing cap tends to expand outward, meaning the surface area of ​​the sealing cap tends to increase. Therefore, the various components of the sealing cap inevitably tend to separate, leading to a deterioration in sealing performance. However, in the sealing cap structure 10 provided in this embodiment, when the internal pressure of a single battery cell increases, the outward expansion of the terminal post assembly 13 results in it pressing against the working surface 11b of the cover plate 11. The cover plate 11 and the terminal post assembly 13 compress the sealing assembly 12. This not only prevents the terminal post assembly 13 from separating from the cover plate 11, but also optimizes the sealing performance. Therefore, the sealing cap structure 10 provided in this embodiment reduces the risk of electrolyte leakage caused by the increase in internal pressure of a single battery cell.

[0040] In some embodiments, the cover plate 11 includes a first part 112 and a second part 113, an electrode hole 111 is formed in the first part 112, the second part 113 is wrapped around the first part 112, the second part 113 extends along the thickness direction of the cover plate 11, and the side of the second part 113 is used to connect with the housing 20 of the single battery cell.

[0041] In the prior art, the common methods of connecting the cover and the battery casing are either fastening the cover to the opening of the battery casing or embedding the cover into the opening of the battery casing. In the latter case, the sealing strength between the cover and the battery casing is affected by the thickness of the cover. Increasing the thickness of the cover leads to an increase in the volume and weight of the single battery cell, as well as an increase in the resistance of the cover, which degrades the performance of the single battery cell. Therefore, in this embodiment, the cover plate 11 is configured as a first part 112 and a second part 113. The second part 113 extends along the thickness direction of the cover plate 11, and its side is connected to the casing 20 of the single battery cell. In this way, without increasing the thickness of the cover plate 11, the connection area between the cover structure 10 and the casing 20 of the single battery cell is increased, the connection strength is increased, and the airtightness of the single battery cell is further optimized.

[0042] Furthermore, the cover plate 11 also includes a third part 114 and a fourth part 115. The third part 114 surrounds the first part 112, and the opposite ends of the fourth part 115 are connected to the third part 114 and the second part 113 respectively. The third part 114, the fourth part 115 and the second part 113 surround to form a groove, and the opening direction of the groove is the same as the orientation of the outer surface 11a.

[0043] In existing single-cell batteries, the surface of the cell near the cover is typically designed as a flat surface for ease of assembly. Therefore, the distance between the cover and the bottom of the battery casing determines the capacity of the single-cell battery. This embodiment incorporates a groove, which reduces the internal volume of the single-cell battery without altering the volume of the adapted cell, thereby improving the utilization rate of the battery's internal space.

[0044] Furthermore, the first part 112 and the third part 114 are connected by an arc; and / or, the third part 114 and the fourth part 115 are connected by an arc.

[0045] When the internal pressure of a single cell increases, there will be a certain stress concentration at the connection between the first part 112 and the third part 114, and between the third part 114 and the fourth part 115. The arc connection can reduce the risk of tearing at the connection and further improve the safety of the single cell.

[0046] In some embodiments, the electrode assembly 13 includes an upper electrode 131 and a lower electrode 132; the lower electrode 132 includes a column 1321 and a flange 1322 connected to each other, the flange 1322 and the cover plate 11 clamp the sealing assembly 12, the column 1321 passes through the electrode hole 111, the upper electrode 131 is connected to the column 1321, and the upper electrode 131 and the lower electrode 132 clamp the sealing assembly 12.

[0047] During actual use, transportation, and storage, the sealing structure 10 is susceptible to impacts from the external working environment. The terminal assembly 13, as one of the two terminals of the assembled single battery cell that interacts with the external environment, often protrudes from the surface of the single battery cell. This makes the terminal assembly 13 highly vulnerable to external forces pushing into the single battery cell. Consequently, there is a tendency for separation between the terminal assembly 13 and the sealing assembly 12, and between the cover plate 11 and the sealing assembly 12. Experiments have shown that, due to the relatively large mating surface between the cover plate 11 and the sealing assembly 12, leakage caused by this external force primarily occurs between the terminal assembly 13 and the sealing assembly 12.

[0048] Accordingly, in this embodiment, the electrode assembly 13 is configured as an upper electrode 131 and a lower electrode 132 connected to each other. The column 1321 passes through the electrode hole 111 and is connected to the upper electrode 131. The upper electrode 131 and the lower electrode 132 together sandwich the sealing assembly 12. When the internal pressure of the single cell rises, the lower electrode 132 and the sealing assembly 12 are pressed together to avoid the deterioration of the airtightness of the sealing structure 10. When the electrode assembly 13 is squeezed or bumped from the outside, the upper electrode 131 and the sealing assembly 12 abut against each other to prevent the electrode assembly 13 and the sealing assembly 12 from separating.

[0049] Furthermore, the upper pole post 131 has a slot 1311, and the post 1321 is inserted into the slot 1311.

[0050] The function of the upper terminal post 131 has been previously discussed. The upper terminal post 131 is designed to withstand impacts from the external environment on the terminal post assembly 13, preventing gaps between the terminal post assembly 13 and the sealing assembly 12. While impacts act on the upper terminal post 131, the lower terminal post 132 is not directly affected by the external environment; in fact, the side of the lower terminal post 132 furthest from the upper terminal post 131 is subject to the internal pressure of the individual battery cells. Therefore, the probability of separation between the upper terminal post 131 and the lower terminal post 132 is relatively small. A slot 1311 is provided in the upper terminal post 131, and the connection between the upper terminal post 131 and the lower terminal post 132 is achieved through a snap-fit ​​mechanism, minimizing assembly difficulty while meeting performance requirements.

[0051] Optionally, the inner diameter of the sealing assembly is D1, and the outer diameter of the upper pole is D2, where D1 < D2.

[0052] When D1 < D2, that is, when the projection of the inner wall of the sealing component in the thickness direction of the cover plate falls completely within the projection range of the upper pole, on the one hand, the clamping of the upper and lower poles on the sealing component is more stable; on the other hand, in addition to the airtightness between the lower pole and the sealing component, the upper pole and the sealing component also have airtightness. When the pole component is subjected to a sudden impact from the outside, this can further ensure the sealing performance of the cover structure is intact.

[0053] Optionally, the outer diameter of the upper pole post is D2, and the diameter of the pole post hole is D3, where D2 < D3.

[0054] When the terminal assembly provides one electrode output for a single cell and the cover plate provides the other electrode output, D2 < D3 ensures that there is a gap between the terminal assembly and the cover plate, thus ensuring good insulation between the positive and negative electrodes of the single cell, while facilitating assembly.

[0055] Optionally, the cover plate includes a first part and a third part, an electrode hole is formed in the first part, the third part surrounds the first part and extends along the thickness direction of the cover plate, the third part and the first part enclose to form a receiving space, and the flange and sealing assembly are received in the receiving space.

[0056] As previously explained, for ease of assembly, the surface of the cell near the cover is usually designed to be flat. The arrangement of the accommodating space ensures that the side of the terminal assembly near the cell and the side of the cover plate near the cell are as close to the same plane as possible, which facilitates the configuration of the cell.

[0057] Furthermore, the outer diameter of the flange is D4, the inner diameter of the third part is D5, and D4 < D5; and / or, the inner diameter of the third part is D5, and the outer diameter of the sealing assembly is D6, and D6 < D5.

[0058] When the terminal assembly provides one electrode output for a single cell and the cover plate provides the other, a D4 < D5 ensures good insulation between the positive and negative electrodes of the single cell while facilitating assembly. Since the airtightness at the junction of the cover plate and the sealing assembly primarily depends on the fit between the sealing assembly and the first part, whether the sealing assembly contacts the third part does not significantly affect airtightness. A D6 < D5 creates a gap between the third part and the sealing assembly. This gap can buffer pressure changes within the single cell without significantly altering its dimensions.

[0059] It should be noted that the sealing assembly mainly performs two functions: sealing and insulation. Therefore, the effectiveness of the sealing assembly is affected by its width. When configuring the above-mentioned buffer gap, D4 should be kept as close to D6 as possible.

[0060] Please refer to the following: Figure 4 , Figure 4 This is a schematic diagram showing the cooperation relationship between the sealing component 12, the cover plate 11, and the pole assembly 13 provided in another embodiment of the present invention. In some embodiments, the sealing component 12 includes a sealing ring 121 and an insulating sheet 122, with the sealing ring 121 and the insulating sheet 122 alternately sleeved. The projection of the sealing ring 121 in the thickness direction of the cover plate 11 falls on both the projection of the flange 1322 and the projection of the cover plate 11.

[0061] There are two common methods for connecting the pole assembly 13 and the cover plate 11. One method is to coat both sides of the sealing assembly 12 with adhesive to bond the sealing assembly 12 and the pole assembly 13, as well as the sealing assembly 12 and the cover plate 11. The other method is to use a material with certain heat-melting properties to make the sealing assembly 12, sandwich the sealing assembly 12 between the pole assembly 13 and the cover plate 11, and hot-press the pole assembly 13 and the cover plate 11, at least melting the surface of the sealing assembly 12, and then cooling and bonding it. In the case of hot pressing, because the sealing assembly 12 is partially compressed by the cover plate 11 and the pole assembly 13 in a molten state, this part of the sealing assembly 12 in a fluid state tends to overflow along the surface of the cover plate 11 and the pole assembly 13. Although this does not affect the sealing performance, it will affect the appearance of the cover structure 10 to some extent.

[0062] Therefore, in this embodiment, the sealing component 12 is configured as a sealing ring 121 and an insulating sheet 122. When the sealing ring 121 flows to both sides along the gap between the pole assembly 13 and the cover plate 11 under hot-press conditions, the insulating sheet 122 can play a flow-blocking role, making the appearance of the cover structure 10 cleaner.

[0063] Please see Figures 4 to 8 As shown, Figure 5 This is a schematic diagram of the overall structure of a single battery provided in an embodiment of this utility model; Figure 6 This is an exploded structural diagram of a single battery provided in an embodiment of the present invention; Figure 7 This is a cross-sectional schematic diagram of a single battery provided in an embodiment of this utility model; Figure 8 yes Figure 7 A magnified view of a portion of region A in the middle.

[0064] To address the aforementioned technical problems, this utility model also discloses a single-cell battery, which includes a cover assembly, a housing 20, and a cell assembly 30. Specifically, the cover structure 10 is the cover structure 10 disclosed in any of the above embodiments, and the cover structure 10 covers the housing 20; the cell assembly 30 is housed within the housing 20 and is electrically connected to the terminal assembly 13 in the cover structure 10.

[0065] Because the single battery disclosed in this embodiment includes the above-mentioned sealing structure 10, the single battery of this embodiment has the technical effects of the above-mentioned embodiments. That is, when the internal pressure of the single battery rises due to operation, the terminal assembly 13 and the cover plate 11 clamp the sealing assembly 12, thus avoiding the deterioration of the airtightness of the sealing structure 10.

[0066] In some embodiments, a single battery cell includes a latch 40, which protrudes from the inner surface of the housing 20, and the cover plate 11 in the sealing structure 10 abuts against the latch 40.

[0067] The locking block 40 allows for easy positioning of the cover structure 10 when it is embedded in the housing 20. In addition, the locking block 40 can also serve as a foolproof structure to prevent the cover structure 10 from being embedded too deeply and squeezing the battery cell.

[0068] In some embodiments, the battery cell assembly 30 includes a core package 31, a first electrode 32, and a second electrode 33. The core package 31 is electrically connected to the first electrode 32 and the second electrode 33, respectively. The first electrode 32 is connected to the electrode post assembly 13, and the second electrode 33 is sandwiched between the cover structure 10 and the housing 20.

[0069] The second electrode 33 is sandwiched between the cover structure 10 and the housing 20, so that the outer peripheral surface of the area where the second electrode 33 is sandwiched can be used as a current-carrying surface, which reduces the current density of the second electrode 33 and enhances the safety of the single cell.

[0070] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0071] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0072] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0073] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the design concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A sealing structure, characterized in that, include: A cover plate has an external surface and a working surface that are arranged opposite to each other in the thickness direction. An electrode hole is formed on the cover plate that penetrates the working surface and the external surface. The working surface is used to face the cell assembly. A sealing assembly is disposed on the working surface; The pole assembly, which clamps the sealing assembly with the cover plate, and passes through the pole hole.

2. The sealing structure according to claim 1, characterized in that, The cover plate includes a first part and a second part. The electrode hole is formed in the first part. The second part is wrapped around the first part and extends along the thickness direction of the cover plate. The side of the second part is used to connect with the casing of the single battery cell.

3. The sealing structure according to claim 2, characterized in that, The cover plate also includes a third part and a fourth part. The third part surrounds the first part, and the opposite ends of the fourth part are connected to the third part and the second part, respectively. The third part, the fourth part, and the second part form a groove, and the opening direction of the groove is the same as the orientation of the outer surface.

4. The sealing structure according to claim 3, characterized in that, The first part and the third part are connected by an arc; and / or The third part and the fourth part are connected by an arc.

5. The sealing structure according to claim 1, characterized in that, The electrode assembly includes an upper electrode and a lower electrode; The lower electrode post includes a column and a flange connected to each other. The flange and the cover plate clamp the sealing assembly. The column passes through the electrode post hole. The upper electrode post is connected to the column and the sealing assembly is clamped between the upper electrode post and the lower electrode post.

6. The sealing structure according to claim 5, characterized in that, The inner diameter of the sealing assembly is D1, and the outer diameter of the upper pole is D2, where D1 < D2.

7. The sealing structure according to claim 5, characterized in that, The upper pole post has a slot, and the post body is inserted into the slot.

8. The sealing structure according to claim 5, characterized in that, The outer diameter of the upper pole post is D2, and the diameter of the pole post hole is D3, where D2 < D3.

9. The sealing structure according to claim 5, characterized in that, The cover plate includes a first part and a third part, the pole hole is formed in the first part, the third part is surrounding the first part and extends along the thickness direction of the cover plate, the third part and the first part surround to form a receiving space, and the flange and the sealing assembly are housed in the receiving space.

10. The sealing structure according to claim 9, characterized in that, The outer diameter of the flange is D4, and the inner diameter of the third part is D5, where D4 < D5; and / or The inner diameter of the third part is D5, and the outer diameter of the sealing assembly is D6, where D6 < D5.

11. The sealing structure according to any one of claims 5-10, characterized in that, The sealing assembly includes a sealing ring and an insulating sheet, which are alternately fitted together. The projection of the sealing ring in the thickness direction of the cover plate falls on the projections of both the flange and the cover plate.

12. A single-cell battery, characterized in that, The single battery cell includes: A capping structure, wherein the capping structure is the capping structure according to any one of claims 1-7; A housing, wherein the sealing structure covers the housing; A battery cell assembly, wherein the battery cell assembly is housed within the housing and is electrically connected to the terminal assembly in the cover structure.

13. The single-cell battery according to claim 12, characterized in that, The single battery cell includes a locking block that protrudes from the inner surface of the housing, and the cover plate in the sealing structure abuts against the locking block.

14. The single-cell battery according to claim 12 or 13, characterized in that, The battery cell assembly includes a core package, a first electrode, and a second electrode. The core package is electrically connected to the first electrode and the second electrode, respectively. The first electrode is connected to the electrode post assembly, and the second electrode is sandwiched between the capping structure and the housing.

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