Battery top cover structure and battery

Abstract

This application relates to a battery top cover structure and a battery, belonging to the field of battery technology. The battery top cover structure includes a top cover sheet, terminals, an upper plastic layer, a lower plastic layer, and a sealing ring. The top cover sheet has mounting holes. The terminals include a post portion and a base portion, with the post portion passing through the mounting hole and its end connected to the base portion. The upper and lower plastic layers are respectively disposed on the upper and lower sides of the top cover sheet for insulation protection between the top cover sheet and the terminals. The sealing ring is at least partially located between the top cover sheet and the base portion. Specifically, the post portion near the base portion has an extension portion facing sideways, with the extension portion partially located between the sealing ring and the base portion. The battery top cover structure provided by this application can reduce the impact of the reaction force of the sealing ring on the copper-aluminum composite interface connection while ensuring the sealing effect of the sealing ring and other structures, thus ensuring the stability of the copper-aluminum composite interface connection.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery top cover structure and a battery. Background Technology

[0002] With the rapid development of new energy technologies, batteries are being used more and more widely. Structurally, a battery typically includes a cell portion formed by winding or stacking electrode sheets, and a top cover portion located at the end of the cell portion. Specifically, the top cover portion at the battery end usually includes structures such as terminals and a top cover plate. The terminals and the top cover plate are fixed to and connected to the tabs of the cell portion for connection and conduction. Furthermore, at the contact point between the top cover plate and the terminals, there are usually upper and lower plastic seals for insulation protection, as well as sealing rings for sealing.

[0003] In existing technologies, specifically regarding the electrode post, the base portion connecting the electrode post to the battery cell tab is typically made of copper, while the post body, away from the tab, is usually made of aluminum. These two separate components are connected to form a T-shaped copper-aluminum composite electrode post, with a copper-aluminum composite interface at their connection point. During assembly, the base is positioned below the top cover, and the post body extends above it. A sealing ring is typically fitted onto the post body and positioned between the top cover and the base. However, this assembly method causes the reaction force of the sealing ring to act between the base and the top cover, leading to a tendency for the base to move away from the top cover. Meanwhile, the post body, restrained by the upper plastic, will be engaged with the top cover, further causing the base body to move away from the post body. This increases the likelihood of separation between the base and the post body at the copper-aluminum composite interface.

[0004] Therefore, there is an urgent need to provide a battery top cover structure that, while ensuring the sealing effect of the sealing ring and other structures, reduces the impact of the reaction force of the sealing ring on the copper-aluminum composite interface connection, and ensures the stability of the copper-aluminum composite interface connection. Summary of the Invention

[0005] The purpose of this application is to provide a battery top cover structure and battery that, while ensuring the sealing effect of the sealing ring and other structures, reduces the impact of the reaction force of the sealing ring on the copper-aluminum composite interface connection, thereby ensuring the stability of the copper-aluminum composite interface connection.

[0006] To achieve the above objectives, in a first aspect, this application provides a battery top cover structure, comprising a top cover sheet, terminals, an upper plastic layer, a lower plastic layer, and a sealing ring. The top cover sheet has a mounting hole. The terminals include a post portion and a base portion, the post portion passing through the mounting hole and its end connected to the base portion. The upper and lower plastic layers are respectively disposed on the upper and lower sides of the top cover sheet for insulating protection between the top cover sheet and the terminals. The sealing ring is at least partially located between the top cover sheet and the base portion. Specifically, the post portion near the base portion has an extension portion extending to the side, the extension portion being located between the sealing ring and the base portion.

[0007] Based on the above embodiments of this application, similar to the prior art, the battery top cover structure of this application, during assembly, connects the column portion and the base portion to form a complete terminal post. Then, one end of the column portion passes through the assembly hole and partially protrudes from the top cover plate to facilitate the connection and conduction between the terminal post and the external circuit. Simultaneously, upper and lower plastic sheets are respectively disposed on the upper and lower sides of the top cover plate to insulate and protect the gap between the top cover plate and the terminal post. A sealing ring is disposed at the gap between the upper and lower plastic sheets to seal the gap between the terminal post and the top cover plate.

[0008] Based on this, this application further provides an extension at the end of the column portion connecting to the base portion, such that the extension portion is located between the sealing ring and the base portion. At this time, the reaction force of the sealing ring along the pole column axis will act on both the base portion and the extension portion simultaneously, thereby reducing the reaction force of the sealing ring acting on the base portion by sharing the load. While ensuring the sealing effect of the sealing ring and other structures, the impact of the reaction force of the sealing ring on the connection interface between the column portion and the base portion is reduced, ensuring the stability of the connection between the column portion and the base portion.

[0009] In some embodiments, the extension includes a first extension and a second extension, the first extension being connected to the column portion, the second extension being connected to the first extension, and the first extension and the second extension being angled together. A base portion is fitted to the first extension and the second extension, and a sealing ring is fitted to both the first extension and the second extension.

[0010] Based on the embodiments described above, the specific structure of the extension is further defined. By further providing a first extension and a second extension that are angled to each other, a bending structure is formed on the extension while sharing the reaction force of the sealing ring. Based on this bending structure, on the one hand, the sealing effect of the sealing ring at the gap between the pole post and the top cover plate can be improved through the cooperation between the bending structure and the sealing ring. On the other hand, the connection area between the pole post and the base post can be increased, thereby improving the connection strength between the pole post and the base post and ensuring the stability of the connection between the pole post and the base post.

[0011] In some embodiments, the base portion includes a support portion and a sealing portion, the support portion extending along a first direction to form the sealing portion, the first direction corresponding to the radial direction of the pole post. A first extension portion and a second extension portion are respectively attached to and fixed to the sealing portion.

[0012] Based on the embodiments described above, the specific structure of the base portion is defined such that, similar to the extension at the end of the column portion, the base portion also extends laterally to form a sealing portion. The sealing portion facilitates contact and fixation with the first and second extension portions, thereby improving the connection strength between the column portion and the base portion.

[0013] In some embodiments, the sealing ring includes a first sealing segment and a second sealing segment, the first sealing segment being connected to the second sealing segment and the first sealing segment being fitted to the first extension, and the second sealing segment being fitted to the second extension.

[0014] Based on the embodiments described above, the structure of the sealing ring is specifically defined. By providing a first sealing segment and a second sealing segment, and ensuring that the first and second sealing segments respectively fit against the first and second extension portions, the sealing ring structure is adapted to the extension portion structure. This allows for better fit between the sealing ring and the pole post, thereby enhancing the sealing effect of the sealing ring in conjunction with the bending structure formed on the extension portion. Furthermore, the above-described configuration also makes the sealing ring assembly more stable, reducing the possibility of displacement and thus making the sealing effect of the sealing ring more reliable.

[0015] In some embodiments, the sealing ring further includes a third sealing segment connected to the second sealing segment. The sealing portion protrudes from the second extension in a first direction, the third sealing segment is respectively abutted against the end face of the second extension and the surface of the sealing portion, and the end of the third sealing segment abuts against the lower plastic.

[0016] Based on the embodiments described above, since the sealing portion protrudes from the second extension portion along the first direction, a stepped surface structure is formed between the end of the second extension portion and the sealing portion. At this time, by providing a third sealing segment, and having the third sealing segment respectively abut against the end face of the second extension portion and the surface of the sealing portion, the stepped surface structure at the contact position between the end of the extension portion and the sealing portion is sealed, thereby improving the sealing effect on the pole. Simultaneously, the end of the third sealing segment abuts against the lower plastic, thereby achieving a contact seal with the lower plastic.

[0017] In some embodiments, the sealing ring further includes a fourth sealing segment connected to the first sealing segment. The end of the fourth sealing segment abuts against the upper plastic.

[0018] Based on the above embodiments of this application, similar to the third sealing section, a fourth sealing section is provided, and the fourth sealing section abuts against the upper plastic to achieve contact sealing between the sealing ring and the upper plastic. At this time, along the axial direction of the pole, both ends of the sealing ring abut against the upper plastic, the lower plastic, and the pole, respectively; along the radial direction of the pole, the sealing ring abuts against the pole and the top cover plate, respectively. Through this arrangement, the position of the sealing ring is limited, preventing movement of the sealing ring from affecting the sealing effect. Simultaneously, the sealing ring adheres to the upper plastic, the lower plastic, the top cover plate, and the pole in each direction to further improve the sealing effect.

[0019] In some embodiments, the first sealing segment, the second sealing segment, the third sealing segment, and the fourth sealing segment are all at least partially attached to the top cover sheet.

[0020] Based on the above embodiments of this application, stable contact between the sealing ring and the top cover sheet is ensured, thereby guaranteeing the sealing effect between the two.

[0021] In some embodiments, the column portion is provided with an abutment block along a second direction, and an upper plastic portion is disposed between the column portion and the upper surface of the top cover plate, with the upper surface of the upper plastic portion abutting against the abutment block along the second direction, the second direction corresponding to the axial direction of the pole post. A lower plastic portion is disposed between the lower surface of the top cover plate and the base portion.

[0022] Based on the above embodiments of this application, the above settings respectively realize the snap-fit ​​positioning of the upper and lower plastics between the pole post and the top cover plate. On the one hand, the assembly of the upper and lower plastics is more stable and reliable. On the other hand, the positions of the upper and lower plastics relative to the pole post and the top cover plate are fixed, ensuring the insulation and anti-slip effect of the upper and lower plastics.

[0023] In some embodiments, the gap between the column portion and the mounting hole is L1, and the extension portion protrudes from the mounting hole along the first direction by a dimension of L2, where L2 ≥ L1.

[0024] Based on the above embodiments of this application, by the above configuration, the extension protrudes from the assembly hole in the first direction by a size larger than the gap between the post and the assembly hole. At this time, even if the pole post shifts to one side, the extension will avoid coming out of the assembly hole due to the size limitation, thereby further improving the stability of the pole post assembly and avoiding the possibility of the pole post coming out.

[0025] According to a second aspect of this application, a battery is provided, the battery including a cell and the aforementioned battery top cover structure, with a base portion connected to the tabs of the cell.

[0026] Based on the above embodiments of this application, the battery provided by this application includes the above-described battery top cover structure. Through the above configuration, an extension portion is further provided at the end of the column portion connecting to the base portion, such that the extension portion is located between the sealing ring and the base portion. At this time, the reaction force of the sealing ring along the pole axis will act on both the base portion and the extension portion simultaneously, thereby reducing the reaction force of the sealing ring acting on the base portion by sharing the load. While ensuring the sealing effect of the sealing ring and other structures, the influence of the reaction force of the sealing ring on the connection interface between the column portion and the base portion is reduced, ensuring the stability of the connection between the column portion and the base portion, thereby ensuring the reliability of the battery top cover structure during use, extending its service life, and thus ensuring the stability of the battery input and output.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the pole, the top cover, and the seal in the existing technology.

[0029] Figure 2 This is a cross-sectional schematic diagram of the battery top cover structure provided in the embodiments of this application.

[0030] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0031] Figure 4 This is a cross-sectional schematic diagram of the column part and the base part in the battery top cover structure provided in the embodiment of this application.

[0032] Figure 5 This is a cross-sectional schematic diagram of the sealing ring in the battery top cover structure provided in this application embodiment.

[0033] Explanation of reference numerals in the attached figures 1. Top cover plate; 11. Assembly hole; 12. Upper inclined surface; 13. Lower inclined surface; 14. Connecting surface; 2. Column part; 21. Extension part; 211. First extension part; 212. Second extension part; 22. Abutment block; 3. Base part; 31. Support part; 32. Sealing part; 4. Upper plastic; 5. Lower plastic; 6. Sealing ring; 61. First sealing section; 62. Second sealing section; 63. Third sealing section; 64. Fourth sealing section; 7. Column; 8. Sealing body; 9. Sealing element. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this application, it should be noted that, unless otherwise stated, the terms "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In the prior art, reference Figure 1As shown, specifically regarding the electrode post, the base 8, which connects the electrode post to the battery cell tab, is typically made of copper. Copper's excellent conductivity and chemical stability ensure the electrode post's conductivity while preventing corrosion caused by a reaction between the electrode post and the electrolyte. The post body 7, located away from the tab, is usually made of aluminum. Taking advantage of aluminum's low cost and light weight, the two are separately configured and connected to form a T-shaped copper-aluminum composite electrode post, creating a copper-aluminum composite interface at their connection point. During assembly, the base 8 is positioned below the upper cover, and the post body 7 extends above the upper cover. The sealing element 9 is typically fitted onto the post body 7 and positioned between the upper cover and the base 8.

[0041] However, the above assembly method will cause the reaction force of the seal 9 to act between the seat 8 and the upper cover plate, causing the seat 8 to tend to move away from the upper cover plate. Meanwhile, the column 7 will be stuck together with the upper cover plate under the limiting action of the upper plastic part, which will cause the seat 8 to tend to move away from the column 7, thus increasing the possibility of separation between the seat 8 and the column 7 at the copper-aluminum composite interface.

[0042] Therefore, there is an urgent need to provide a battery top cover structure that, while ensuring the sealing effect of the sealing element 9 and other structures, reduces the impact of the reaction force of the sealing element 9 on the copper-aluminum composite interface connection, and ensures the stability of the copper-aluminum composite interface connection.

[0043] To address the aforementioned problems in the prior art, this application provides a battery top cover structure. (Reference) Figure 2 and Figure 3 As shown, the battery top cover structure includes a top cover plate 1, terminals, an upper plastic 4, a lower plastic 5, and a sealing ring 6. The top cover plate 1 has an assembly hole 11. The terminals include a column portion 2 and a base portion 3. The column portion 2 passes through the assembly hole 11 and its end is connected to the base portion 3. The upper plastic 4 and lower plastic 5 are respectively disposed on the upper and lower sides of the top cover plate 1 for insulation protection between the top cover plate 1 and the terminals. The sealing ring 6 is at least partially located between the top cover plate 1 and the base portion 3. Specifically, the end of the column portion 2 near the base portion 3 has an extension portion 21 extending to the side, and the extension portion 21 is partially located between the sealing ring 6 and the base portion 3.

[0044] Based on the above embodiments of this application, similar to the prior art, in the battery top cover structure of this application, during assembly, the column part 2 and the base part 3 are connected to form a complete terminal post. Subsequently, one end of the column part 2 passes through the assembly hole 11 and partially protrudes from the top cover plate 1 to facilitate the connection and conduction between the terminal post and the external circuit. At the same time, the upper plastic 4 and the lower plastic 5 are respectively disposed on the upper and lower sides of the top cover plate 1 to insulate and protect the gap between the top cover plate 1 and the terminal post. The sealing ring 6 is disposed at the gap position between the upper plastic 4 and the lower plastic 5 to seal the gap position between the terminal post and the top cover plate 1.

[0045] Based on this, this application further provides an extension 21 at the end of the column portion 2 connected to the base portion 3, such that the extension 21 is partially located between the sealing ring 6 and the base portion 3. At this time, the reaction force of the sealing ring 6 along the pole column axis will act on both the base portion 3 and the extension 21 simultaneously, thereby reducing the reaction force of the sealing ring 6 on the base portion 3 by sharing the load. While ensuring the sealing effect of the sealing ring 6 and other structures, the influence of the reaction force of the sealing ring 6 on the connection interface between the column portion 2 and the base portion 3 is reduced, ensuring the stability of the connection between the column portion 2 and the base portion 3.

[0046] In the specific processing, the extension 21 can be integrally formed with the column part 2, and various processing methods such as casting or turning can be used. By integrally forming the extension 21 with the column part 2, it is convenient to manufacture and processing while ensuring the overall strength of the column part 2 and the sealing effect at the position of the column part 2. The specific processing method can be selected according to the actual situation, and this application does not impose specific restrictions on it.

[0047] Furthermore, it should be noted that in this application, the specific structure of the pole post is improved to reduce the reaction force of the sealing ring 6 on the base part 3, thereby avoiding affecting the connection stability of the connection position between the base part 3 and the pole part 2.

[0048] Based on this, the specific materials of the top cover plate 1, the terminal post, the upper plastic 4, the lower plastic 5, and the sealing ring 6 can be selected with reference to existing technologies. Specifically, the top cover plate 1 can be made of metal plates commonly used in the existing battery field, such as aluminum alloy plates. When making a specific selection, the structural strength, conductivity, and corrosion resistance of the material can be comprehensively considered to meet the sealing and support strength requirements of the top cover plate 1.

[0049] The pole can be made of copper-aluminum composite material, referring to existing technology. The pole body 2 is made of aluminum, taking advantage of the low cost and light weight of aluminum. The base 3 is made of copper, taking advantage of the good conductivity and electrochemical stability of copper. The connection between the two forms a copper-aluminum composite interface.

[0050] Both the upper plastic 4 and the lower plastic 5 can be made of insulating and high-temperature resistant materials, such as polypropylene. The excellent insulation properties and high mechanical strength of these materials are used to improve the insulation protection effect between the top cover plate 1 and the pole, and to extend the creepage distance.

[0051] The sealing ring 6 can be made of an elastic sealing material, such as rubber. Utilizing the good elasticity and sealing performance of the above material, while also taking into account the resistance to electrolyte corrosion, the sealing ring 6 can provide a stable and reliable sealing effect between the pole and the top cover plate 1.

[0052] Furthermore, in actual production and processing, the battery top cover structure is not limited to the above structure. For example, in actual production and processing, a pressure relief valve is usually also provided on the top cover plate 1, corresponding to the pressure relief port on the battery cell. When thermal runaway occurs inside the battery cell, the pressure relief valve opens to relieve the internal pressure of the battery cell and prevent explosions. The specific structure can be set according to the actual situation, and this application does not impose specific restrictions on it.

[0053] In this application, the extension 21 can be configured with any suitable structure. (See reference) Figure 4 As shown in the exemplary embodiment provided in this application, the extension 21 may include a first extension 211 and a second extension 212. The first extension 211 is connected to the column portion 2, and the second extension 212 is connected to the first extension 211. The first extension 211 and the second extension 212 are arranged at an angle. The base portion 3 is fitted to the first extension 211 and the second extension 212, and the sealing ring 6 is fitted to the first extension 211 and the second extension 212.

[0054] Based on the above embodiments of this application, the specific structure of the extension 21 is further defined. By further providing a first extension 211 and a second extension 212 that are angled to each other, a bending structure is formed on the extension 21 while sharing the reaction force of the sealing ring 6. Based on this bending structure, on the one hand, the sealing effect of the sealing ring 6 at the gap between the pole post and the top cover plate 1 can be improved through the cooperation between the bending structure and the sealing ring 6. On the other hand, the connection area between the column part 2 and the base part 3 can be increased, thereby improving the connection strength between the column part 2 and the base part 3 and ensuring the stability of the connection between the column part 2 and the base part 3.

[0055] It is understood that in some other embodiments of this application, the extension 21 is not limited to the first extension 211 and the second extension 212, and may be further provided with a third extension 21 and a fourth extension 21, etc., and the second extension 212, the third extension 21 and the fourth extension 21 may be arranged at an angle in sequence.

[0056] Furthermore, in some other embodiments of this application, the extension portion 21 may also be configured to extend linearly along the first direction. Similarly, in this case, the extension portion 21 is partially located between the sealing ring 6 and the base portion 3, and the reaction force of the sealing ring 6 along the pole axis acts on the extension portion 21 to share the force on the base portion 3. Alternatively, in some other embodiments of this application, the extension portion 21 may also extend linearly downwards at an acute angle to the first direction. The specific structure of the extension portion 21 can be configured according to actual conditions, and this application does not impose specific limitations on it.

[0057] Further, refer toFigures 2 to 4 As shown, in some other embodiments of this application, the end face of the extension 21 can also be configured as a beveled structure, and the sealing ring 6 is correspondingly fitted to the beveled structure. By providing this beveled structure, on the one hand, the contact area between the extension 21 and the sealing ring 6 is further increased, thereby improving the sealing effect of the sealing ring 6 on the end of the extension 21. On the other hand, the reaction force of the sealing ring 6 along the pole axis can be more distributed to the extension 21, thereby further reducing the reaction force of the sealing ring 6 acting on the base 3.

[0058] In this application, in order to ensure the connection effect between the base portion 3 and the column portion 2, in some embodiments of this application, reference is made to... Figure 4 As shown, the base portion 3 may include a support portion 31 and a sealing portion 32. The support portion 31 extends along a first direction to form the sealing portion 32, and the first direction corresponds to the radial direction of the pole post. The first extension portion 211 and the second extension portion 212 are respectively attached to and fixed to the sealing portion 32.

[0059] Based on the embodiments described above in this application, the specific structure of the base portion 3 is defined. Similar to the extension portion 21 at the end of the column portion 2, the base portion 3 also extends to the side to form a sealing portion 32. By providing the sealing portion 32, it is easy to fit and fix it to the first extension portion 211 and the second extension portion 212, thereby improving the connection strength between the column portion 2 and the base portion 3.

[0060] Specifically, further reference Figure 4 As shown, in order to ensure the connection effect between the column part 2 and the base part 3, in some embodiments of this application, the base part 3 and the sealing part 32 should also be set at an angle, and the angle formed between them should be consistent with the angle formed between the first extension part 211 and the second extension part 212.

[0061] Furthermore, similar to the extension 21, the sealing part 32 and the base part 3 can also be integrally machined, specifically by methods such as casting and turning. Integral machining ensures the connection strength and sealing effect between the sealing part 32 and the base part 3.

[0062] Similarly, in this application, the sealing ring 6 can also be configured with any suitable structure according to the actual situation. (Reference) Figures 2 to 5 As shown in some embodiments of this application, the sealing ring 6 may include a first sealing segment 61 and a second sealing segment 62, the first sealing segment 61 being connected to the second sealing segment 62, and the first sealing segment 61 being attached to the first extension 211, and the second sealing segment 62 being attached to the second extension 212.

[0063] Based on the above embodiments of this application, the structure of the sealing ring 6 is specifically defined. By providing the first sealing segment 61 and the second sealing segment 62, and ensuring that the first sealing segment 61 and the second sealing segment 62 respectively fit against the first extension 211 and the second extension 212, that is, the structure of the sealing ring 6 is adapted to the structure of the extension 21, allowing for better fit between the sealing ring 6 and the pole post. This, combined with the bending structure formed on the extension 21, improves the sealing effect of the sealing ring 6. Simultaneously, the above configuration also makes the assembly of the sealing ring 6 more stable, reducing the possibility of displacement and thus making the sealing effect of the sealing ring 6 more reliable.

[0064] Further, refer to Figure 5 As shown, in some other embodiments of this application, the sealing ring 6 further includes a third sealing segment 63, which is connected to the second sealing segment 62. The sealing portion 32 protrudes from the second extension 212 in a first direction, the third sealing segment 63 is respectively attached to the end face of the second extension 212 and the surface of the sealing portion 32, and the end of the third sealing segment 63 abuts against the lower plastic 5.

[0065] Based on the above embodiments of this application, since the sealing portion 32 protrudes from the second extension portion 212 along the first direction, a stepped surface structure is formed between the end of the second extension portion 212 and the sealing portion 32. At this time, by providing a third sealing segment 63, and by having the third sealing segment 63 adhere to both the end face of the second extension portion 212 and the surface of the sealing portion 32, the stepped surface structure at the contact position between the end of the extension portion 212 and the sealing portion 32 is sealed, thereby improving the sealing effect on the pole. Simultaneously, the end of the third sealing segment 63 abuts against the lower plastic 5, thereby achieving a contact seal with the lower plastic 5.

[0066] In some embodiments of this application, the sealing ring 6 may further include a fourth sealing segment 64, which is connected to the first sealing segment 61. The end of the fourth sealing segment 64 abuts against the upper plastic 4.

[0067] Based on the above embodiments of this application, similar to the third sealing section 63, a fourth sealing section 64 is provided and abuts against the upper plastic 4 to achieve contact sealing between the sealing ring 6 and the upper plastic 4. At this time, along the axial direction of the pole, both ends of the sealing ring 6 abut against the upper plastic 4, the lower plastic 5, and the pole, respectively; along the radial direction of the pole, the sealing ring 6 abuts against the pole and the top cover plate 1, respectively. Through the above arrangement, the position of the sealing ring 6 is limited to prevent movement of the sealing ring 6 from affecting the sealing effect. Simultaneously, the sealing ring 6 is in contact with the upper plastic 4, the lower plastic 5, the top cover plate 1, and the pole in each direction to further improve the sealing effect.

[0068] The specific structure of the sealing ring 6 has been described above. In the specific processing and assembly process, since the sealing ring 6 is mainly used to seal the gap between the pole post and the top cover plate 1 and between the upper plastic 4 and the lower plastic 5, the specific structure and size of the sealing ring 6 should be adapted to the above structure in order to better fill the gap position of the above structure and achieve the sealing effect. The specific settings can be made according to the actual situation, and this application does not impose specific restrictions on this.

[0069] In some embodiments of this application, the first sealing segment 61, the second sealing segment 62, the third sealing segment 63 and the fourth sealing segment 64 are at least partially attached to the top cover plate 1.

[0070] Based on the above embodiments of this application, stable contact between the sealing ring 6 and the top cover plate 1 is ensured, thereby ensuring the sealing effect between the two.

[0071] Furthermore, in this application, the upper plastic 4 and the lower plastic 5 can be fixed between the top cover plate 1 and the pole post in any suitable manner. In some embodiments of this application, the pole body 2 is provided with an abutment block 22 along a second direction, the upper plastic 4 is disposed between the pole body 2 and the upper surface of the top cover plate 1, and the upper surface of the upper plastic 4 abuts against the abutment block 22 along the second direction, the second direction corresponding to the axial direction of the pole post. The lower plastic 5 is partially disposed between the lower surface of the top cover plate 1 and the base portion 3.

[0072] Based on the above embodiments of this application, the upper plastic 4 and the lower plastic 5 are respectively positioned and engaged between the pole post and the top cover plate 1 through the above settings. On the one hand, the assembly of the upper plastic 4 and the lower plastic 5 is more stable and reliable. On the other hand, the positions of the upper plastic 4 and the lower plastic 5 relative to the pole post and the top cover plate 1 are fixed, ensuring the insulation and anti-slip effect of the upper plastic 4 and the lower plastic 5.

[0073] Furthermore, in some other embodiments of this application, the upper plastic 4 and the top cover sheet 1 can be further reinforced by adhesive bonding to improve the connection stability and provide a certain sealing effect. Similarly, the lower plastic 5 and the top cover sheet 1 can also be bonded by adhesive bonding to improve the connection effect. The specific choice can be made according to the actual situation, and this application does not impose any specific limitations.

[0074] refer to Figure 2 As shown in some embodiments of this application, the gap between the column portion 2 and the mounting hole 11 is L1, and the extension portion 21 protrudes from the mounting hole 11 in the first direction by a dimension of L2, where L2 ≥ L1.

[0075] Based on the above embodiments of this application, by the above arrangement, the extension 21 protrudes from the assembly hole 11 in the first direction by a size larger than the gap between the column part 2 and the assembly hole 11. At this time, even if the pole piece shifts to one side, the extension 21 will avoid coming out of the assembly hole 11 due to the size limitation, thereby further improving the stability of the pole piece assembly and avoiding the possibility of the pole piece coming out.

[0076] Specifically, further reference Figure 2 As shown, the pole is usually designed as a cylindrical structure, so the extension 21 is arranged in a ring around the pole's circumference. This dimensional limitation ensures that the extension 21 cannot detach from the mounting hole 11 regardless of the pole's tilt direction. Therefore, even if the pole body 2 separates from the base 3, the pole will not detach.

[0077] In this application, provided the above assembly conditions are met, the top cover 1 can be configured with any suitable structure. (Reference) Figure 2 and Figure 3 As shown in some embodiments of this application, the upper and lower ends of the inner wall of the assembly hole 11 may also be provided with inclined structures, namely an upper inclined surface 12 and a lower inclined surface 13, which are connected by a connecting surface 14. When the upper plastic 4 and the sealing ring 6 are assembled, the contact position of the upper plastic 4 and the sealing ring 6 is located on the side of the connecting surface 14. At this time, an inclined structure adapted to the upper inclined surface 12 is formed on the upper plastic 4 so that the upper plastic 4 fits against the inner wall of the assembly hole 11. Similarly, an inclined structure adapted to the lower inclined surface 13 is formed on the sealing ring 6 so that the sealing ring 6 fits against the inner wall of the assembly hole 11.

[0078] The above-mentioned arrangement facilitates the assembly and snapping of the upper plastic 4 and sealing ring 6 with the top cover plate 1, and also increases the contact area between the top cover plate 1, the upper plastic 4, and the sealing ring 6, thereby further improving the insulation protection effect of the upper plastic 4 and the sealing effect of the sealing ring 6.

[0079] At the same time, it is understood that similar methods can be used to set up inclined surfaces and other structures at the contact positions between the lower plastic 5 and the top cover plate 1, as well as between the lower plastic 5 and the sealing ring 6, in order to facilitate assembly and increase the contact area. The specific settings can be made according to the actual situation, and this application does not impose specific restrictions on this.

[0080] Based on the above technical solution, according to the second aspect of this application, a battery is provided, the battery including a cell and the above-mentioned battery top cover structure, and the base portion 3 is connected to the electrode tab of the cell.

[0081] Based on the above embodiments of this application, the battery provided by this application includes the above-described battery top cover structure. Through the above configuration, an extension 21 is further provided at the end of the column portion 2 connected to the base portion 3, such that the extension 21 is partially located between the sealing ring 6 and the base portion 3. At this time, the reaction force of the sealing ring 6 along the pole axis will act on both the base portion 3 and the extension 21 simultaneously, thereby reducing the reaction force of the sealing ring 6 acting on the base portion 3 by sharing the load. While ensuring the sealing effect of the sealing ring 6 and other structures, the influence of the reaction force of the sealing ring 6 on the connection interface between the column portion 2 and the base portion 3 is reduced, ensuring the stability of the connection between the column portion 2 and the base portion 3, thereby ensuring the reliability of the battery top cover structure during use, extending its service life, and thus ensuring the stability of the battery input and output.

[0082] Furthermore, it should be noted that in the specific production, processing and assembly process, the battery is not limited to the above structure, and may also include structures such as the casing. Since this application does not involve improvements to this part, it will not be described in detail here.

[0083] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0084] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0085] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. A battery top cover structure, characterized in that, The battery top cover structure includes: A top cover sheet, wherein an assembly hole is provided on the top cover sheet; An electrode post includes a column portion and a base portion, wherein the column portion passes through the mounting hole and its end is connected to the base portion; Upper and lower plastic sheets are respectively disposed on the upper and lower sides of the top cover plate for insulation protection between the top cover plate and the pole post; and... A sealing ring is located at least partially between the top cover plate and the base portion; The column portion has an extension at one end near the base portion, which is located between the sealing ring and the base portion.

2. The battery top cover structure according to claim 1, characterized in that, The extension includes a first extension and a second extension, the first extension being connected to the column portion, the second extension being connected to the first extension, and the first extension and the second extension being set at an angle. The base portion is fitted to the first extension portion and the second extension portion, and the sealing ring is fitted to the first extension portion and the second extension portion.

3. The battery top cover structure according to claim 2, characterized in that, The base portion includes a support portion and a sealing portion, the support portion extending along a first direction to form the sealing portion, the first direction corresponding to the radial direction of the pole post; The first extension and the second extension are respectively attached and fixed to the sealing portion.

4. The battery top cover structure according to claim 2, characterized in that, The sealing ring includes a first sealing section and a second sealing section, the first sealing section being connected to the second sealing section, and the first sealing section being fitted to the first extension, and the second sealing section being fitted to the second extension.

5. The battery top cover structure according to claim 4, characterized in that, The sealing ring further includes a third sealing section, which is connected to the second sealing section; The sealing portion protrudes from the second extension portion along the first direction, the third sealing segment is respectively attached to the end face of the second extension portion and the surface of the sealing portion, and the end of the third sealing segment abuts against the lower plastic.

6. The battery top cover structure according to claim 5, characterized in that, The sealing ring further includes a fourth sealing section, which is connected to the first sealing section; The end of the fourth sealing section abuts against the upper plastic.

7. The battery top cover structure according to claim 6, characterized in that, The first sealing section, the second sealing section, the third sealing section and the fourth sealing section are all at least partially attached to the top cover plate.

8. The battery top cover structure according to claim 1, characterized in that, The column portion is provided with an abutment block along the second direction, the upper plastic is disposed between the column portion and the upper surface of the top cover plate, and the upper surface of the upper plastic abuts against the abutment block along the second direction, the second direction corresponding to the axial direction of the pole post; The lower plastic portion is disposed between the lower surface of the top cover and the base portion.

9. The battery top cover structure according to any one of claims 1-8, characterized in that, The gap between the column portion and the assembly hole is L1, and the extension portion protrudes from the assembly hole in the first direction by a dimension of L2, where L2 ≥ L1.

10. A battery, characterized in that, The battery includes: Battery cells; and, The battery top cover structure according to any one of claims 1-9, wherein the base portion is connected to the electrode tab of the battery cell.

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