Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of power batteries, the single battery comprises a cover plate assembly and a sealing ring, the cover plate assembly comprises a cover plate body, a first pole and a second pole, and the cover plate body is provided with a first assembly hole; the first pole is arranged on one side of the cover plate body and partially penetrates through the first assembly hole; the second pole comprises a connecting part, a first matching layer, a second matching layer and a third matching layer, the connecting part is arranged on the side, in the length direction of the cover plate body, of the third matching layer and connected with the third matching layer, and the electrode assembly is connected with the side, away from the first pole, of the connecting part; and the first matching layer penetrates through the first assembly hole and is connected with the first pole. The sealing ring is arranged at the joint of the first pole and the second pole and abuts against the cover plate body. The distance G1 between the inner wall of the sealing ring and the outer wall of the first matching layer is larger than or equal to 0.05 mm and smaller than or equal to 0.6 mm. According to the embodiment, the space utilization rate of the single battery is improved.

Description

Technical Field

[0001] This application belongs to the field of power battery technology, specifically relating to a single cell battery, a battery pack, and an electrical device. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural components of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only ensure the safety and reliability of lithium-ion batteries, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules and even the pack. Because there are various connection relationships inside the structural components, and the requirements of sealing performance and overcurrent performance must be taken into account, the design of the structural components is particularly important.

[0003] The electrode structure of batteries typically involves riveting the casing and terminals together, then welding them to connecting pieces, resulting in low performance and yield. Furthermore, the traditional riveting method suffers from instantaneous impact during riveting, severely affecting the stability of the explosion-proof valve. Additionally, the presence of the riveting block significantly occupies axial space, leading to low space utilization. Utility Model Content

[0004] This application provides a single-cell battery to improve the performance and yield of the electrode structure; another objective of this application is to provide a battery pack; yet another objective of this application is to provide an electrical device.

[0005] Embodiments of this application provide a single-cell battery, comprising:

[0006] The shell has a receiving cavity;

[0007] The electrode assembly is disposed within the receiving cavity;

[0008] A cover plate assembly includes a cover plate body, a first electrode post, and a second electrode post. The cover plate body seals the receiving cavity and is connected to the housing. The cover plate body has a first mounting hole. The first electrode post is disposed on the side of the cover plate body opposite to the electrode assembly and partially passes through the first mounting hole. The second electrode post is located within the receiving cavity and includes a connecting portion and a first mating layer, a second mating layer, and a third mating layer arranged in a stepped manner along the thickness direction of the cover plate body. The connecting portion is disposed on one side of the third mating layer along the length direction of the cover plate body and is connected to the third mating layer. The electrode assembly is connected to the side of the connecting portion opposite to the first electrode post. The first mating layer passes through the first mounting hole and is connected to the first electrode post.

[0009] A sealing ring is disposed at the connection between the first pole post and the second pole post, and abuts against the cover plate body;

[0010] The distance between the inner wall of the sealing ring and the outer wall of the first mating layer is G1mm, which satisfies 0.05mm≤G1≤0.6mm.

[0011] In some embodiments, the first pole post includes:

[0012] The first electrode post body is disposed on the side of the cover plate body away from the electrode assembly, and partially passes through the first assembly hole;

[0013] A boss is provided on the side of the first electrode post body facing the electrode assembly and is connected to the first electrode post body, and part of the boss passes through the first mounting hole.

[0014] The second pole has a second mounting hole, which passes through the first mating layer, the second mating layer and the third mating layer in sequence along the thickness direction of the cover plate body. Part of the boss passes through the second mounting hole and is connected to its hole wall.

[0015] In some embodiments, the sealing ring includes:

[0016] A first sealing part is provided around the wall of the first assembly hole and sandwiched between the boss and the wall of the first assembly hole.

[0017] The second sealing part is disposed around and connected to the first sealing part. The side of the second sealing part away from the electrode assembly abuts against the cover plate body and the boss respectively, and the side of the second sealing part facing the electrode assembly abuts against the second mating layer.

[0018] In some embodiments, in the thickness direction of the cover plate body, the height of the first mating layer is T1, the height of the second mating layer is T2, the height of the third mating layer is T3mm, and the height of the connecting portion is T4mm, satisfying 1.2mm≤T1=T2=T3=T4≤2.0mm.

[0019] In some embodiments, in the thickness direction of the cover plate body, the height between the side end face of the second mating layer facing the first pole post and the side end face of the first mating layer facing the first pole post is H1mm, satisfying 0.6mm≤H1≤1.5mm.

[0020] In some embodiments, the distance between the inner wall and the outer wall of the first mating layer is W1mm, satisfying 1.5mm≤W1≤2.3mm;

[0021] The distance between the outer wall of the second mating layer and the outer wall of the first mating layer is W2mm, which satisfies 2.8mm≤W2≤3.5mm;

[0022] The distance between the outer wall of the third mating layer and the outer wall of the second mating layer is W3mm, which satisfies 0.5mm≤W3≤1mm.

[0023] In some embodiments, the minimum diameter of the second mounting hole is D mm, satisfying 1.5 mm ≤ D ≤ 3 mm.

[0024] In some embodiments, the electrode assembly includes:

[0025] The electrode body is disposed within the receiving cavity and connected to the second electrode post;

[0026] The electrode tab has one end connected to the electrode body and the other end connected to the side of the connecting part facing the cover plate body.

[0027] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0028] This application also discloses an electrical device, including a single battery as described in the above embodiments, or including a battery pack as described in the above embodiments.

[0029] Several embodiments of this application have one of the following beneficial effects:

[0030] An embodiment of this application provides a single-cell battery, including a casing, an electrode assembly, a cover assembly, and a sealing ring. The casing has a receiving cavity; the electrode assembly is disposed within the receiving cavity. The cover assembly includes a cover body, a first electrode post, and a second electrode post. The cover body seals the receiving cavity and connects to the casing, and the cover body has a first mounting hole. The first electrode post is disposed on the side of the cover body away from the electrode assembly and partially passes through the first mounting hole. The second electrode post is located within the receiving cavity and includes a connecting portion and a first mating layer, a second mating layer, and a third mating layer arranged in a stepped manner along the thickness direction of the cover body. The connecting portion is disposed on any side of the third mating layer along the length direction of the cover body and connects to the third mating layer. The electrode assembly is connected to the side of the connecting portion away from the first electrode post. The first mating layer passes through the first mounting hole and connects to the first electrode post. The sealing ring is disposed at the connection between the first electrode post and the second electrode post and abuts against the cover body. In the width direction of the cover body, the distance between the inner wall of the sealing ring and the outer wall of the first mating layer is G1 mm, satisfying 0.05 mm ≤ G1 ≤ 0.6 mm. This embodiment eliminates the need for rivet assembly and the second electrode post, replacing a portion of the existing electrode post. Through the connection between the second and first electrode posts and between the second and second electrode posts and the tabs, electrical connection between the electrode assembly and the first electrode post can be achieved. Compared to existing methods, this reduces the axial space occupied by the individual battery cells, improving space utilization. A gap G1 exists between the inner wall of the sealing ring and the outer wall of the first mating layer. When the sealing ring is compressed, the gap G1 provides space for deformation. Simultaneously, the inner ring of the sealing ring seals the connection between the first and second electrode posts, while the outer ring seals the connection between the inner wall of the cover plate body and the outer wall of the first electrode post.

[0031] The battery pack of this application embodiment includes the single battery cell as described in the above embodiments. Therefore, it can have all the technical features and effects of the single battery cell described above, which will not be repeated here.

[0032] The electrical equipment in this application includes a single battery or a battery pack as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery or battery pack, which will not be repeated here. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A cross-sectional view of a single battery cell provided in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the spacing G1 in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the overall structure of the cover plate assembly provided in an embodiment of this application from one angle;

[0037] Figure 4 This is a schematic diagram of the overall structure of the cover plate assembly provided in an embodiment of this application from another angle;

[0038] Figure 5 A cross-sectional view of the cover plate assembly provided in an embodiment of this application from one angle;

[0039] Figure 6 A cross-sectional view of the cover plate assembly provided in an embodiment of this application from another angle;

[0040] Figure 7 This is a schematic diagram of height H1 in an embodiment of this application;

[0041] Figure 8 This is a schematic diagram of the spacing parameters in the embodiments of this application;

[0042] Figure 9 This is a schematic diagram of the aperture D in an embodiment of this application;

[0043] Figure 10 This is a schematic diagram showing the positional relationship between the second pole post and the electrode assembly provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10-Shell; 11-Receiving cavity;

[0046] 20 - Electrode assembly; 21 - Electrode body; 22 - Tab;

[0047] 30-Cover plate assembly; 31-Cover plate body; 311-First mounting hole; 32-First pole post; 321-First pole post body; 322-Boss; 33-Second pole post; 331-Connecting part; 332-First mating layer; 333-Second mating layer; 334-Third mating layer; 335-Second mounting hole;

[0048] 40 - Sealing ring; 41 - First sealing part; 42 - Second sealing part;

[0049] 50 - Plastic. Detailed Implementation

[0050] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. In the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0052] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes depicted in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0053] As a preamble to the embodiments of this application, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural components of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only provide safety and reliability for lithium-ion batteries, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules and even the pack. Because there are various connection relationships inside the structural components, and the requirements of sealing performance and overcurrent performance must be taken into account, the design scheme of the structural components is particularly important.

[0054] The electrode structure of batteries typically involves riveting the casing and terminals together, then welding them to connecting pieces, resulting in low performance and yield. Furthermore, the traditional riveting method suffers from instantaneous impact during riveting, severely affecting the stability of the explosion-proof valve. Additionally, the presence of the riveting block significantly occupies axial space, leading to low space utilization.

[0055] In view of this, embodiments of this application provide a single-cell battery, which aims to solve at least some of the above-mentioned technical problems.

[0056] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a cross-sectional view of a single battery cell provided in an embodiment of this application. Figure 2 This is a schematic diagram of the spacing G1 in an embodiment of this application. Figure 3 This is a schematic diagram of the overall structure of the cover plate assembly provided in an embodiment of this application from one angle. Figure 4 This is a schematic diagram of the overall structure of the cover assembly provided in an embodiment of this application from another angle. A single battery in an embodiment of this application includes a housing 10, an electrode assembly 20, a cover assembly 30, and a sealing ring 40. The housing 10 has a receiving cavity 11; the electrode assembly 20 is disposed in the receiving cavity 11. The cover plate assembly 30 includes a cover plate body 31, a first electrode post 32, and a second electrode post 33. The cover plate body 31 covers the receiving cavity 11 and is connected to the housing 10. The cover plate body 31 has a first assembly hole 311. The first electrode post 32 is disposed on the side of the cover plate body 31 away from the electrode assembly 20 and partially passes through the first assembly hole 311. The second electrode post 33 is located in the receiving cavity 11. The second electrode post 33 includes a connecting part 331 and a first mating layer 332, a second mating layer 333, and a third mating layer 334 arranged in a stepped manner along the thickness direction of the cover plate body 31. The connecting part 331 is disposed on any side of the third mating layer 334 along the length direction of the cover plate body 31 and is connected to the third mating layer 334. The electrode assembly 20 is connected to the side of the connecting part 331 away from the first electrode post 32. The first mating layer 332 passes through the first assembly hole 311 and is connected to the first electrode post 32. A sealing ring 40 is disposed at the connection between the first pole post 32 and the second pole post 33, and abuts against the cover plate body 31. The distance between the inner wall of the sealing ring 40 and the outer wall of the first mating layer 332 is G1mm, which satisfies 0.05mm≤G1≤0.6mm.

[0057] It should be noted that the housing 10 provides a receiving cavity 11 for accommodating the electrode assembly 20 and protecting the internal components. The housing 10 is connected to the cover assembly 30 to form a closed structure. The electrode assembly 20 is the core part of the battery, responsible for the electrochemical reaction, and is disposed within the receiving cavity 11 of the housing 10, and connected to the connection portion 331 of the second terminal 33. The cover assembly 30 includes a cover body 31, a first terminal 32, and a second terminal 33. The cover body 31 closes the receiving cavity 11 of the housing 10 and provides structural support, is connected to the housing 10, and has a first mounting hole 311 for mounting the terminal assembly (first terminal 32 and second terminal 33). The first terminal 32 serves as an electrode terminal of the battery, providing external electrical connection, and is disposed on the side of the cover body 31 opposite to the electrode assembly 20, partially passing through the first mounting hole 311. The second terminal 33 connects the electrode assembly 20 and the first terminal 32, conducts current, and is located within the receiving cavity 11. The sealing ring 40 provides a sealing function to prevent electrolyte leakage and ensure the safety and reliability of the battery.

[0058] It should be noted that the first electrode post 32 is a copper-aluminum composite electrode post. It is understood that copper-aluminum composite negative electrode posts possess excellent electrothermal properties, corrosion resistance, wear resistance, and plasticity, which can meet the high-efficiency electronic characteristics and safety requirements of new energy batteries.

[0059] It should be noted that the outer periphery shape of the first mating layer 332 can be circular, square, or other shapes; the outer periphery shape of the second mating layer 333 can be circular, square, or other shapes; and the outer periphery shape of the third mating layer 334 can be circular, square, or other shapes. It is not required that the outer periphery shapes of the first mating layer 332, the second mating layer 333, and the third mating layer 334 be identical; all three can have the same outer periphery shape, all three can be different, or any two can be the same. Specific limitations are not imposed on the outer periphery shapes of the first mating layer 332, the second mating layer 333, and the third mating layer 334.

[0060] In view of this, this embodiment eliminates the need for rivet assembly of the second electrode post 33, which replaces a portion of the existing electrode post. Simultaneously, through the connection between the second electrode post 33 and the first electrode post 32, and the connection between the second electrode post 32 and the tab 22, electrical connection between the electrode assembly 20 and the first electrode post 32 can be achieved. Compared to existing methods, this reduces the axial space occupied by the individual battery cell and improves the space utilization of the individual battery cell. A gap G1 exists between the inner wall of the sealing ring 40 and the outer wall of the first mating layer 332. When the sealing ring 40 is compressed, the gap G1 provides space for the deformation of the sealing ring 40. Simultaneously, the inner ring of the sealing ring 40 can seal the connection between the first electrode post 32 and the second electrode post 33, and the outer ring of the sealing ring 40 can seal the connection between the inner wall of the cover plate body 31 and the outer wall of the first electrode post 33.

[0061] In some embodiments, please refer to Figure 5 and Figure 6 , Figure 5 This is a cross-sectional structural diagram of the cover plate assembly provided in an embodiment of this application from one angle. Figure 6 This is a cross-sectional view of the cover plate assembly provided in this embodiment. The first electrode post 32 includes a first electrode post body 321 and a boss 322. The first electrode post body 321 is disposed on the side of the cover plate body 31 away from the electrode assembly 20 and partially passes through the first mounting hole 311. The boss 322 is disposed on the side of the first electrode post body 321 facing the electrode assembly 20 and is connected to the first electrode post body 321, with a portion of the boss 322 passing through the first mounting hole 311. The second electrode post 33 has a second mounting hole 335, which sequentially passes through the first mating layer 332, the second mating layer 333, and the third mating layer 334 along the thickness direction of the cover plate body 31. A portion of the boss 322 passes through the second mounting hole 335 and is connected to its hole wall.

[0062] It should be noted that the first electrode post body 321, as the main conductor of current, conducts current from the electrode assembly 20 to the external circuit. The first electrode post body 321 is located on the side of the cover plate body 31 facing away from the electrode assembly 20, and a stable connection with the cover plate body 31 is ensured by partially passing through the first mounting hole 311. The boss 322 provides a connection point, allowing the second electrode post 33 to be effectively connected to the first electrode post body 321. The boss 322 is located on the side of the first electrode post body 321 facing the electrode assembly 20, connects to the first electrode post body 321, and partially passes through the first mounting hole 311, thereby enhancing the connection strength between the first electrode post 32 and the cover plate body 31. The function of the second electrode post 33 is to simplify the electrical connection between the electrode assembly 20 and the first electrode post 32, reduce the complexity of the assembly, and provide a stable current conduction path. The second electrode post 33 has a second mounting hole 335, which sequentially passes through the first mating layer 332, the second mating layer 333, and the third mating layer 334 along the thickness direction of the cover plate body 31. Partial protrusions 322 pass through the second mounting hole 335 and connect to its wall, ensuring a tight connection between the second electrode post 33 and the first electrode post body 321. This structural design creates a robust and efficient electrical connection path between the first electrode post 32 and the second electrode post 33, ensuring that current can be smoothly conducted from the electrode assembly 20 to the external circuit. This design not only improves the battery's electrical performance but also optimizes space utilization and structural stability.

[0063] It should be noted that the boss 322 and the second mounting hole 335 can be circular, square, or other shapes, but they must be identical. This design ensures that the boss 322 can smoothly pass through the second mounting hole 335 and form a tight fit, thus achieving a stable connection. Furthermore, the boss 322 is connected to the first body 331 by welding. The welding area is located where the outer wall of the boss 322 abuts against the wall of the second mounting hole 335. This welding method not only enhances the stability and reliability of the structure but also ensures efficient and safe current conduction. Through this design, the electrical performance and mechanical strength of the entire component are optimized.

[0064] It should be noted that the second electrode post 33 consists of three mating layers: a first mating layer 332, a second mating layer 333, and a third mating layer 334. The first mating layer 332 is located on the side of the cover plate body 31 facing the electrode assembly 20, with its end face facing the first electrode post 32 abutting against the first electrode post 32, and its outer wall abutting against the sealing ring 40. This layer design ensures direct contact with the first electrode post 32 and provides a sealing function with the sealing ring 40. The second mating layer 333 is connected to the first mating layer 332, and its end face facing the first electrode post 32 also abuts against the sealing ring 40. This layer further enhances the sealing effect and provides additional support for the structure. The third mating layer 334 is connected to the second mating layer 333. The first mating layer 332, the second mating layer 333, and the third mating layer 334 are arranged in a stepped manner along the thickness direction of the cover plate body 31. This stepped design contributes to the stability and strength of the structure. The second mounting hole 335 penetrates the first mating layer 332, the second mating layer 333, and the third mating layer 334, ensuring that the boss 322 can pass smoothly and form a tight fit with these layers. Furthermore, the connecting portion 331 is located on one side of the third mating layer 334 along the length of the cover plate body 31 and connects to the third mating layer 334. This design provides additional structural support, provides an area for welding the tabs, and ensures the stability and functionality of the entire assembly. Through this multi-layered design, the assembly not only achieves efficient current conduction but also enhances sealing and mechanical strength.

[0065] It should be noted that the outer periphery shape of the first mating layer 332 can be circular, square, or other shapes; the outer periphery shape of the second mating layer 333 can be circular, square, or other shapes; and the outer periphery shape of the third mating layer 334 can be circular, square, or other shapes. It is not required that the outer periphery shapes of the third mating layer 334, the second mating layer 333, and the third mating layer 334 be identical; all three can have the same outer periphery shape, all three can be different, or any two can be the same. Specific limitations are not imposed on the outer periphery shapes of the first mating layer 3311, the second mating layer 333, and the third mating layer 334.

[0066] In some embodiments, please refer to Figure 6 , Figure 6 This is a cross-sectional view of the cover plate assembly provided in an embodiment of this application. The sealing ring 40 includes a first sealing portion 41 and a second sealing portion 42. The first sealing portion 41 is disposed around the wall of the first mounting hole 311 and sandwiched between the boss 322 and the wall of the first mounting hole 311. The second sealing portion 42 is disposed around and connected to the first sealing portion 41. The side of the second sealing portion 42 facing away from the electrode assembly 20 abuts against the cover plate body 31 and the boss 322, respectively, and the side of the second sealing portion 42 facing the electrode assembly 20 abuts against the second mating layer 333.

[0067] It should be noted that the structure and function of the sealing ring 40 are to ensure the sealing and stability of the battery assembly. The sealing ring 40 consists of a first sealing part 41 and a second sealing part 42, each undertaking different sealing tasks. The first sealing part 41 is disposed around the wall of the first mounting hole 311 and sandwiched between the boss 322 and the wall of the first mounting hole 311. Its main function is to provide a primary seal, preventing electrolyte or gas inside the battery from leaking through the first mounting hole 311. By being tightly sandwiched between the boss 322 and the hole wall, the first sealing part 41 ensures the sealing integrity of this critical area. The second sealing part 42 is disposed around and connected to the first sealing part 41, forming a more complex sealing structure. The side of the second sealing part 42 facing away from the electrode assembly 20 abuts against the cover plate body 31 and the boss 322 respectively. This design provides an additional sealing layer to further prevent any possible leakage. The side of the second sealing part 42 facing the electrode assembly 20 abuts against the second mating layer 333, which not only enhances the sealing effect but also provides additional mechanical support for the entire assembly. Through this multi-layered sealing design, the sealing ring 40 effectively prevents leakage of internal battery materials while also enhancing the structural stability of the component. This design ensures the safety and reliability of the battery under various operating conditions.

[0068] In some embodiments, please refer to Figure 7 , Figure 7This is a schematic diagram illustrating the spacing parameters of each embodiment of this application. In the thickness direction of the cover plate body 31, the height of the first mating layer 332 is T1, the height of the second mating layer 333 is T2, the height of the third mating layer 334 is T3mm, and the height of the connecting portion 331 is T4mm, satisfying 1.2mm ≤ T1 = T2 = T3 = T4 ≤ 2.0mm. It should be noted that the uniform height ensures good fit and alignment between the layers. This consistency helps reduce errors during assembly, improves production efficiency, and enhances product consistency. By ensuring that each mating layer and connecting portion 331 has the same height, the design simplifies the manufacturing process and reduces the requirements for machining accuracy. This height range (1.2mm to 2.0mm) provides sufficient structural strength and stability without excessively increasing material costs or weight. This thickness range provides the necessary mechanical strength and durability while maintaining a lightweight design for the component, contributing to improved overall battery performance. The uniform height design also helps optimize thermal management and current conduction. By ensuring that the height of each layer is consistent, heat and current can be distributed and conducted more evenly, thereby improving battery efficiency and safety.

[0069] In some embodiments, such as Figure 6 As shown, the end face of the boss 322 that abuts against the first mating layer 332 is on the same plane as the end face of the cover body 31 facing the electrode assembly 20. It should be noted that this ensures consistent compression of the sealing ring 40. By placing the end face of the boss 322 that abuts against the first mating layer 332 and the end face of the cover body 31 facing the electrode assembly 20 on the same plane, the sealing ring 40 can be subjected to pressure evenly during installation, thus achieving consistent compression. This uniform compression is crucial for sealing performance, as it prevents excessive or insufficient compression on either side, thereby avoiding potential leakage risks. This design simplifies the assembly process. Ensuring that the end faces of all related components are on the same plane during assembly reduces the complexity of alignment and adjustment, improves assembly efficiency, and lowers the error rate during production. This planar design also helps improve the overall structural stability of the assembly. By ensuring that all components are on the same plane, the entire assembly can distribute stress more evenly when subjected to external pressure or vibration, thereby improving durability and reliability.

[0070] In some embodiments, please refer to Figure 7 , Figure 7This is a schematic diagram of the height H1 in an embodiment of this application. In the width direction of the cover plate body 31, the height between the end face of the second mating layer 333 facing the first electrode post 32 and the end face of the first mating layer 332 facing the first electrode post 32 is H1 mm, satisfying 0.6 mm ≤ H1 ≤ 1.5 mm. It should be noted that when H1 is within this range, on the one hand, it ensures that a reasonable stepped structure is formed between the second mating layer 333 and the first mating layer 332, further enhancing the structural stability of the entire second electrode post 33. A reasonable height difference allows the two mating layers to work together more effectively when bearing the forces generated during current conduction and other internal stresses of the battery, avoiding local stress concentration caused by unreasonable structure, thereby improving the durability of the second electrode post 33. On the other hand, this height difference also has a positive impact on the sealing effect of the sealing ring 40. After the battery is assembled, the sealing ring 40 will be subjected to pressure from various components. A suitable H1 value can ensure that the sealing ring 40 reaches the optimal compression state in this area, thereby effectively preventing the electrolyte or gas inside the battery from leaking through the connection between the first terminal 32 and the second terminal 33 and the surrounding area, further improving the safety and reliability of the battery.

[0071] In some embodiments, please refer to Figure 8 , Figure 8This is a schematic diagram illustrating the spacing parameters of each embodiment of this application. The spacing between the inner wall and the outer wall of the first mating layer 332 is W1mm, satisfying 1.5mm≤W1≤2.3mm. The spacing between the outer wall of the second mating layer 333 and the outer wall of the first mating layer 332 is W2mm, satisfying 2.8mm≤W2≤3.5mm. The spacing between the outer wall of the third mating layer 334 and the outer wall of the second mating layer 333 is W3mm, satisfying 0.5mm≤W3≤1mm. It should be noted that, from a mechanical strength perspective, a reasonable W1 value ensures that the first mating layer 332 has sufficient wall thickness to withstand the pressure generated by current conduction and internal chemical reactions during battery charging and discharging, avoiding structural damage due to excessively thin walls. From an electrical performance perspective, a suitable wall thickness helps stabilize current transmission, reduce resistance loss, and ensure that current can pass through efficiently and stably when the first mating layer 332 connects the first terminal 32 and the second mating layer 333. The distance between the outer wall of the second mating layer 333 and the outer wall of the first mating layer 332 is W2mm, with a value ranging from 2.8mm ≤ W2 ≤ 3.5mm. This spacing optimizes the internal spatial layout of the battery. On the one hand, it allows the second mating layer 333 and the first mating layer 332 to cooperate structurally. When physical changes such as thermal expansion and contraction occur inside the battery, they can buffer the mutual forces to a certain extent, improving structural stability. On the other hand, this distance also provides a spatial basis for the effective sealing of the sealing ring 40 in this area, ensuring that the electrolyte and gas inside the battery will not leak through the gap between the two mating layers during battery operation, thus improving the battery's sealing performance and safety. The distance between the outer wall of the third mating layer 334 and the outer wall of the second mating layer 333 is W3mm, which is required to meet the condition 0.5mm ≤ W3 ≤ 1mm. Although this distance is relatively small, it is equally indispensable. The smaller W3 value ensures that the third mating layer 334 and the second mating layer 333 fit tightly together, further enhancing the structural compactness of the entire second electrode post 33. During battery operation, this design effectively reduces additional resistance caused by structural loosening, improving current conduction efficiency. Simultaneously, this tightly fitted structure helps maintain the stability of the internal electric and magnetic fields of the battery, reducing the impact of electromagnetic interference on battery performance.

[0072] In some embodiments, please refer to Figure 9 , Figure 9This is a schematic diagram of the aperture D in an embodiment of this application. The minimum aperture of the second mounting hole 335 is D mm, satisfying 1.5 mm ≤ D ≤ 3 mm. It should be noted that, from the perspective of compatibility with the first electrode post 32, the protrusion 322 of the first electrode post 32 passes through the second mounting hole 335 and connects with its hole wall. When D is within this range, it ensures a tight and stable fit between the protrusion 322 and the second mounting hole 335. If the aperture is too small, the protrusion 322 will have difficulty passing through smoothly, increasing the difficulty of assembly and potentially damaging the electrode post due to forced assembly, affecting the overall structural strength and electrical connection performance of the battery. Conversely, if the aperture is too large, a gap will appear between the protrusion 322 and the hole wall, preventing an effective tight connection. This will increase the contact resistance during current conduction, affecting the battery's charging and discharging efficiency and potentially causing safety hazards such as localized overheating. From the perspective of current conduction efficiency, a reasonable aperture can optimize the current transmission path. When the battery is charging and discharging, the current needs to be conducted through the first terminal 32 to the second terminal 33 via the second mounting hole 335, and then flows to the electrode assembly 20. A suitable hole diameter can make the current distribution more uniform, reduce current concentration caused by unreasonable hole diameter, reduce resistance loss, and improve the battery's energy conversion efficiency. At the same time, stable and efficient current conduction also plays a crucial role in maintaining the stability of the internal chemical reactions of the battery, helping to extend the battery's lifespan.

[0073] In some embodiments, such as Figure 1 As shown, the single-cell battery also includes an upper plastic 50, which is disposed between the first terminal 32 and the cover plate body 31, and partially covers the outer peripheral surface of the first terminal 32. It should be noted that the upper plastic 50 provides additional insulation protection. By covering the outer peripheral surface of the first terminal 32, the upper plastic 50 effectively prevents accidental contact between the first terminal 32 and other metal components, thereby reducing the risk of short circuits. The upper plastic 50 helps enhance structural stability. The upper plastic 50 forms a robust connection between the first terminal 32 and the cover plate body 31, reducing component displacement under vibration or impact. The upper plastic 50 also serves a sealing function. Through filling and wrapping, the plastic material prevents moisture and other contaminants from entering the battery, thereby protecting the internal components of the battery from external environmental influences. The use of the upper plastic 50 also helps simplify the manufacturing and assembly process. Plastic materials are easy to mold and process, and can be precisely customized according to design requirements, thereby improving production efficiency and product consistency.

[0074] In some embodiments, please refer to Figure 10 , Figure 10This is a schematic diagram illustrating the positional relationship between the second electrode post and the electrode assembly according to an embodiment of this application. The electrode assembly 20 includes an electrode body 21 and a tab 22. The electrode body 21 is disposed within the receiving cavity 11 and connected to the first electrode post 32. One end of the tab 22 is connected to the electrode body 21, and the other end is connected to the side of the connecting portion 331 facing the cover plate body 31. It should be noted that the electrode body 21 is disposed within the receiving cavity 11 and connected to the second electrode post 33. This design ensures the electrical connection between the electrode body 21 and other critical components of the battery. By placing the electrode body 21 within the receiving cavity 11, the design provides a protected environment, helping to prevent external factors from affecting the electrode, thereby improving the overall performance and lifespan of the battery. One end of the tab 22 is connected to the electrode body 21, and the other end is connected to the connecting portion 331, located on the side facing the cover plate body 31. This connection method ensures effective current conduction, transferring current from the electrode body 21 through the tab 22 to the second electrode post 33, thereby enabling the normal operation of the battery. The design of tab 22 typically needs to take into account its conductivity and mechanical strength to ensure that it can withstand current and physical stress during battery operation.

[0075] This application also discloses a battery pack, including the single battery cells as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery cells, which will not be repeated here.

[0076] This application also discloses an electrical device, including a single battery as described in the above embodiments, or a battery pack as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery or battery pack, which will not be repeated here.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0078] The single battery, battery pack, and electrical equipment provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A single-cell battery, characterized in that, include: The shell has a receiving cavity; The electrode assembly is disposed within the receiving cavity; A cover plate assembly includes a cover plate body, a first electrode post, and a second electrode post. The cover plate body seals the receiving cavity and is connected to the housing. The cover plate body has a first mounting hole. The first electrode post is disposed on the side of the cover plate body opposite to the electrode assembly and partially passes through the first mounting hole. The second electrode post is located within the receiving cavity and includes a connecting portion and a first mating layer, a second mating layer, and a third mating layer arranged in a stepped manner along the thickness direction of the cover plate body. The connecting portion is disposed on one side of the third mating layer along the length direction of the cover plate body and is connected to the third mating layer. The electrode assembly is connected to the side of the connecting portion opposite to the first electrode post. The first mating layer passes through the first mounting hole and is connected to the first electrode post. A sealing ring is disposed at the connection between the first pole post and the second pole post, and abuts against the cover plate body; The distance between the inner wall of the sealing ring and the outer wall of the first mating layer is G1mm, which satisfies 0.05mm≤G1≤0.6mm.

2. The single-cell battery according to claim 1, characterized in that, The first pole post includes: The first electrode post body is disposed on the side of the cover plate body away from the electrode assembly, and partially passes through the first assembly hole; A boss is provided on the side of the first electrode post body facing the electrode assembly and is connected to the first electrode post body, and part of the boss passes through the first mounting hole. The second pole has a second mounting hole, which passes through the first mating layer, the second mating layer and the third mating layer in sequence along the thickness direction of the cover plate body. Part of the boss passes through the second mounting hole and is connected to its hole wall.

3. The single-cell battery according to claim 2, characterized in that, The sealing ring includes: A first sealing part is provided around the wall of the first assembly hole and sandwiched between the boss and the wall of the first assembly hole. The second sealing part is disposed around and connected to the first sealing part. The side of the second sealing part away from the electrode assembly abuts against the cover plate body and the boss respectively, and the side of the second sealing part facing the electrode assembly abuts against the second mating layer.

4. The single-cell battery according to claim 3, characterized in that, In the thickness direction of the cover plate body, the height of the first mating layer is T1, the height of the second mating layer is T2, the height of the third mating layer is T3mm, and the height of the connecting part is T4mm, satisfying 1.2mm≤T1=T2=T3=T4≤2.0mm.

5. The single-cell battery according to claim 3, characterized in that, In the thickness direction of the cover plate body, the height between the end face of the second mating layer facing the first pole post and the end face of the first mating layer facing the first pole post is H1mm, which satisfies 0.6mm≤H1≤1.5mm.

6. The single-cell battery according to claim 3, characterized in that, The distance between the inner wall and the outer wall of the first mating layer is W1mm, which satisfies 1.5mm≤W1≤2.3mm; The distance between the outer wall of the second mating layer and the outer wall of the first mating layer is W2mm, which satisfies 2.8mm≤W2≤3.5mm; The distance between the outer wall of the third mating layer and the outer wall of the second mating layer is W3mm, which satisfies 0.5mm≤W3≤1mm.

7. The single-cell battery according to claim 2, characterized in that, The minimum diameter of the second assembly hole is D mm, which satisfies 1.5 mm ≤ D ≤ 3 mm.

8. The single-cell battery according to claim 1, characterized in that, The electrode assembly includes: The electrode body is disposed within the receiving cavity and connected to the second electrode post; The electrode tab has one end connected to the electrode body and the other end connected to the side of the connecting part facing the cover plate body.

9. A battery pack, characterized in that, Includes a single cell battery as described in any one of claims 1 to 8 above.

10. An electrical appliance, characterized in that, It includes a single cell battery as described in any one of claims 1 to 8, or a battery pack as described in claim 9.

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