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 shell, an electrode assembly, a cover plate assembly and a sealing ring, and the shell is provided with an accommodating cavity; the electrode assembly is arranged in the containing cavity. The cover plate assembly comprises a cover plate body, a first pole and a second pole, the cover plate body covers the accommodating cavity and is connected with the shell, and the cover plate body is provided with a first assembly hole; the first pole is arranged on one side, deviating from the electrode assembly, of the cover plate body and partially penetrates through the first assembly hole; the second pole is located in the containing cavity and comprises a first body and second bodies, the first body partially penetrates through the first assembly hole to be connected with the first pole, the second bodies are arranged on the two sides, in the width direction of the cover plate body, of the first body and connected with the first body, and the electrode assembly is connected with the side, away from the first pole, of the second body. The sealing ring is arranged at the joint of the first pole and the second pole and abuts against the cover plate body. 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 in the receiving cavity and includes a first body and a second body. The first body partially passes through the first mounting hole and is connected to the first electrode post. The second body is disposed on both sides of the first body along the width direction of the cover plate body and is connected to the first body. The electrode assembly is connected to the side of the second body opposite to the first electrode post.

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

[0010] In some embodiments, the first pole post includes:

[0011] The first electrode post body is disposed on the side of the cover plate body opposite to the electrode assembly;

[0012] A protrusion is disposed on the side of the first electrode post body facing the electrode assembly and connected to the first electrode post body, and partially passes through the first mounting hole;

[0013] The cover plate assembly has a second mounting hole that penetrates the first body along the thickness direction of the cover plate body, and a portion of the protrusion passes through the second mounting hole and is connected to its hole wall.

[0014] In some embodiments, the first body includes:

[0015] The first mating layer partially passes through the first assembly hole and connects with the protrusion. The side of the first mating layer facing the first pole post abuts against the first pole post, and the side of the first mating layer facing the wall of the first assembly hole abuts against the sealing ring.

[0016] The second mating layer is connected to the first mating layer, and the outer wall of the second mating layer abuts against the sealing ring;

[0017] The third mating layer is connected to the second mating layer and abuts against the sealing ring; the second body is disposed on both sides of the third mating layer along the width direction of the cover plate body and is connected to the third mating layer;

[0018] The first mating layer, the second mating layer, and the third mating layer are arranged in a stepped manner along the thickness direction of the cover plate body, and the second assembly hole penetrates the first mating layer, the second mating layer, and the third mating layer.

[0019] In some embodiments, the sealing ring includes:

[0020] A first sealing layer is disposed at the connection between the first pole post and the second pole post. The inner wall of the first sealing layer abuts against the outer wall of the first mating layer, and the outer wall of the first sealing layer abuts against the wall of the first assembly hole.

[0021] A connecting part is provided along the thickness direction of the cover plate body. One end of the connecting part is connected to the first sealing layer. The side of the connecting part facing the second pole post abuts against the outer wall of the second mating layer. The side of the connecting part away from the second pole post abuts against the hole wall of the first assembly hole.

[0022] The second sealing layer is connected to the other end of the connecting part. The inner wall of the second sealing layer abuts against the outer wall of the second mating layer. The end face of the second sealing layer facing the first pole abuts against the side of the cover plate body facing the electrode assembly.

[0023] In some embodiments, in the thickness direction of the cover plate body, the height of the first mating layer, the height of the second mating layer, and the height of the third mating layer are all T1 mm, and the height of the second body is T2 mm, satisfying T1 > T2.

[0024] In some embodiments, in the thickness direction of the cover plate body, the end face of the second mating layer facing the first electrode post is higher than the end face of the cover plate body facing the electrode assembly.

[0025] In some embodiments, the single battery cell further includes an upper plastic layer disposed between the first electrode post and the cover plate body, and a portion of the upper plastic layer covers the outer peripheral surface of the first electrode post.

[0026] In some embodiments, the electrode assembly includes:

[0027] The electrode body is disposed within the receiving cavity and connected to the second electrode post;

[0028] The tab has one end connected to the electrode body and the other end connected to the side of the second body away from the second electrode post.

[0029] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0030] 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.

[0031] Several embodiments of this application have one of the following beneficial effects:

[0032] A single-cell battery according to an embodiment of this application includes 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 terminal post, and a second terminal post. The cover body seals the receiving cavity and is connected to the casing. The cover body has a first mounting hole. The first terminal post is disposed on the side of the cover body opposite to the electrode assembly and partially passes through the first mounting hole. The second terminal post is located within the receiving cavity and includes a first body and a second body. The first body partially passes through the first mounting hole and connects to the first terminal post. The second body is disposed on both sides of the first body along the width direction of the cover body and connects to the first body. The electrode assembly is connected to the side of the second body opposite to the first terminal post. The sealing ring is disposed at the connection between the first and second terminal posts and abuts against the cover body. In this embodiment, the second terminal post replaces a portion of the existing terminal post, and through the connection between the second terminal post and the first terminal post and the connection between the second terminal post and the electrode tab, the electrical connection between the electrode assembly and the first terminal post is achieved while improving the space utilization of the single-cell battery.

[0033] 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.

[0034] 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

[0035] 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.

[0036] Figure 1 A cross-sectional view of a single battery cell provided in an embodiment of this application;

[0037] Figure 2 A cross-sectional view of a single battery cell provided in an embodiment of this application from another angle;

[0038] Figure 3 This is a schematic diagram of the structure of the first pole provided in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the structure of the sealing ring provided in the embodiments of this application;

[0040] Figure 5 Schematic diagrams of various parameters provided for embodiments of this application;

[0041] Figure 6 A diagram showing the positional relationship between the electrode assembly and the second pole provided in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10-Shell; 11-Receiving cavity;

[0044] 20 - Electrode assembly; 21 - Electrode body; 22 - Tab;

[0045] 30-Cover plate assembly; 31-Cover plate body; 311-First mounting hole; 32-First pole post; 321-First pole post body; 322-Protrusion; 33-Second pole post; 331-First body; 3311-First mating layer; 3312-Second mating layer; 3313-Third mating layer; 332-Second body; 34-Second mounting hole;

[0046] 40 - Sealing ring; 41 - First sealing layer; 42 - Connecting part; 43 - Second sealing layer;

[0047] 50 - Plastic. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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 shown 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Please see Figures 1 to 6 One type of single-cell battery in the embodiments of this application, such as Figure 1 , Figure 2 , Figure 6 As shown, the single battery 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, and the electrode assembly 20 is disposed within the receiving cavity 11. The cover assembly 30 includes a cover body 31, a first electrode post 32, and a second electrode post 33. The cover body 31 covers the receiving cavity 11 and is connected to the housing 10. The cover body 31 has a first mounting hole 311. The first electrode post 32 is disposed on the side of the cover body 31 away from the electrode assembly 20 and partially passes through the first mounting hole 311. The second electrode post 33 is located within the receiving cavity 11 and includes a first body 331 and a second body 332. The first body 331 partially passes through the first mounting hole 311 and is connected to the first electrode post 32. The second body 332 is disposed on both sides of the first body 331 along the width direction of the cover body 31 and is connected to the first body 331. The electrode assembly 20 is connected to the side of the second body 332 away from the first electrode post 32. The 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.

[0055] 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.

[0056] In view of this, this embodiment reduces the axial space occupied by the single battery cell by eliminating traditional riveting components and adopting a second terminal post 33 design. This design not only improves space utilization but also provides more design space for other functional components of the battery. The connection between the second terminal post 33 and the first terminal post 32, as well as the connection between the second terminal post 33 and the electrode assembly 20, ensures efficient current transmission. The use of copper-aluminum composite terminal posts further enhances electrothermal performance, meeting the requirements for high-efficiency electronics and safety. By optimizing the terminal post design, the impact of instantaneous impact on the stability of the explosion-proof valve is reduced, enhancing battery safety. At the same time, the sealing ring 40 effectively improves the battery's sealing performance, preventing electrolyte leakage and further enhancing battery reliability. Eliminating the riveting process reduces production steps and complexity, improving production efficiency and yield. This not only reduces production costs but also reduces product defects caused by improper riveting.

[0057] In some embodiments, such as Figure 3 As shown, the first electrode post 32 includes a first electrode post body 321 and a protrusion 322. The first electrode post body 321 is disposed on the side of the cover plate body 31 opposite to the electrode assembly 20, and its main function is to provide a stable connection point so that current can be transmitted from the inside of the battery to the external circuit. The protrusion 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. The protrusion 322 partially passes through the first mounting hole 311, and its function is to realize the mechanical and electrical connection with the second electrode post 33. The cover plate assembly 30 has a second mounting hole 34, which penetrates the first body 331 along the thickness direction of the cover plate body 31. Part of the protrusion 322 passes through the second mounting hole 34 and is connected to its hole wall.

[0058] It should be noted that the shape of the protrusion 322 can be circular, square, or other shapes, and the shape of the second mounting hole 34 can also be circular, square, or other shapes. The shape of the protrusion 322 must be the same as the shape of the second mounting hole 34 to ensure that the protrusion 322 can pass through the second mounting hole 34 and form a mating fit. Furthermore, the protrusion 322 is welded to the first body 331. The welding area is where the outer wall of the protrusion 322 abuts against the wall of the second mounting hole 34 during assembly. The purpose of welding is to provide a strong mechanical connection, preventing loosening or breakage due to vibration or other external forces during use, thereby improving the reliability and safety of the battery. Through the synergistic effect of these structures, this embodiment enables the entire battery system to achieve efficient current transmission while improving battery space utilization and safety. The refined design and optimized structure ensure the stability and reliability of the battery during use.

[0059] In some embodiments, such as Figure 4 As shown, the first body 331 includes a first mating layer 3311, a second mating layer 3312, and a third mating layer 3313. The first mating layer 3311 partially passes through a first mounting hole 311 and connects to a protrusion 322. The side of the first mating layer 3311 facing the first terminal 32 abuts against the first terminal 32 to ensure effective current transmission. The side of the first mating layer 3311 facing the wall of the first mounting hole 311 abuts against a sealing ring 40, providing a sealing function. The second mating layer 3312 connects to the first mating layer 3311, and its outer wall abuts against the sealing ring 40, further enhancing the sealing effect and ensuring the safety and reliability of the battery. The third mating layer 3313 connects to the second mating layer 3312, and its side facing the first terminal 32 abuts against the sealing ring 40, providing additional sealing support. The second body 332 is disposed on both sides of the third mating layer 3313 along the width direction of the cover plate body 31 and is connected to the third mating layer 3313 to ensure the overall stability of the structure. The first mating layer 3311, the second mating layer 3312, and the third mating layer 3313 are arranged in a stepped manner along the thickness direction of the cover plate body 31. This design helps to disperse stress and improve the mechanical strength of the structure. The second mounting hole 34 penetrates through the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313, ensuring that the protrusion 322 can pass smoothly and form a stable connection with each mating layer.

[0060] It should be noted that the outer periphery shape of the first mating layer 3311 can be circular, square, or other shapes; the outer periphery shape of the second mating layer 3312 can be circular, square, or other shapes; and the outer periphery shape of the third mating layer 3313 can be circular, square, or other shapes. It is not required that the outer periphery shapes of the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313 be consistent; they can all be the same, all different, or any two the same. Specific limitations are not imposed on the outer periphery shapes of the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313. Through the synergistic effect of these structures, the sealing ring 40 is adapted to the stepped mating layer design, achieving a multi-layered sealing effect. The stepped design not only improves the tightness and reliability of the seal but also enhances the mechanical strength and stability of the entire structure. The multi-layered sealing structure effectively prevents electrolyte leakage, ensuring the stability and safety of the battery under various operating conditions. The refined design and optimized structure enable the battery to maintain high efficiency and reliable performance in complex application environments.

[0061] In some embodiments, such as Figure 4 As shown, the sealing ring 40 includes a first sealing layer 41, a connecting portion 42, and a second sealing layer 43. The first sealing layer 41 is disposed at the connection between the first electrode post 32 and the second electrode post 33. The inner wall of the first sealing layer 41 abuts against the outer wall of the first mating layer 3311, and the outer wall of the first sealing layer 41 abuts against the wall of the first mounting hole 311. The main function of the first sealing layer 41 is to provide a primary seal, preventing electrolyte leakage from the electrode post connection and ensuring the safety and reliability of the battery. The connecting portion 42 is disposed along the thickness direction of the cover plate body 31. One end of the connecting portion 42 is connected to the first sealing layer 41, the side of the connecting portion 42 facing the second electrode post 33 abuts against the outer wall of the second mating layer 3312, and the side of the connecting portion 42 away from the second electrode post 33 abuts against the wall of the first mounting hole 311. The function of the connecting portion 42 is to act as a bridge in the sealing structure, connecting the first sealing layer 41 and the second sealing layer 43, ensuring the integrity and continuity of the entire sealing system. The second sealing layer 43 is connected to the other end of the connecting portion 42. The inner wall of the second sealing layer 43 abuts against the outer wall of the second mating layer 3312, and the end face of the second sealing layer 43 facing the first electrode post 32 abuts against the side of the cover plate body 31 facing the electrode assembly 20. The function of the second sealing layer 43 is to provide a secondary seal, further enhance the sealing effect, and prevent any possible leakage.

[0062] In this embodiment, through the synergistic effect of these structures, the sealing ring 40 achieves a multi-layered sealing effect. The first sealing layer 41 provides a primary seal, the connecting portion 42 ensures the continuity and integrity of the seal, and the second sealing layer 43 provides a secondary seal. This design not only improves the reliability of the seal but also enhances the overall safety of the battery. The multi-layered sealing structure effectively prevents electrolyte leakage, ensuring the stability and safety of the battery under various operating conditions. The refined design and optimized structure enable the battery to maintain high efficiency and reliable performance in complex application environments.

[0063] In some embodiments, such as Figure 5 As shown, in the thickness direction of the cover plate body 31, the heights of the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313 are all T1 mm, and the height of the second body 332 is T2 mm, satisfying T1 > T2. It should be noted that the consistent height design of the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313 ensures that each layer has the same strength and stability under pressure. Because the height of these mating layers is greater than the height T2 mm of the second body 332, they play a major supporting role in the structure, providing higher mechanical strength and stability. This design helps to disperse and withstand external pressure, preventing structural deformation or damage. The height of the second body 332 is T2 mm, lower than the heights of the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313. This design allows the second body 332 to play an auxiliary supporting role in the structure, while also providing a dedicated welding area for welding the tabs 22 of the electrode assembly 20, meeting the welding requirements of the tabs 22. Through this structural arrangement, the cover plate body 31 is not only optimized in terms of mechanical properties, but also ensures the effectiveness and reliability of the welding process.

[0064] In some embodiments, such as Figure 4 and Figure 5As shown, in the thickness direction of the cover plate body 31, the end face of the second mating layer 3312 facing the first electrode post 32 is higher than the end face of the cover plate body 31 facing the electrode assembly 20. This design is mainly to prevent the solder joint from protruding. It should be noted that by designing the end face of the second mating layer 3312 to be higher, additional space and support can be provided during the welding process. This structure helps to prevent the solder joint from protruding excessively outside the cover plate body 31 when welding the first electrode post 32, thereby ensuring the flatness and aesthetics of the weld. Furthermore, this design can reduce potential interference to other components during the welding process, ensuring the stability of the weld quality. At the same time, this height difference design also helps to protect the solder joint from external mechanical stress, reducing the risk of solder joint failure during use. By providing a higher support surface, the solder joint can be better enclosed and protected, extending the battery's lifespan. In summary, this design ensures the quality of the weld and the overall reliability of the battery by preventing solder joint protrusion, while also improving the structural integrity and aesthetics of the battery.

[0065] In some embodiments, such as Figure 1 and Figure 2 As shown, the single-cell battery also includes an upper plastic layer 50, which is disposed between the first electrode post 32 and the cover plate body 31, and partially covers the outer peripheral surface of the first electrode post 32. It should be noted that the presence of the upper plastic layer 50 provides additional insulation protection. By covering the outer peripheral surface of the first electrode post 32, the upper plastic layer 50 effectively prevents possible electrical short circuits between the electrode and the cover plate body 31, improving battery safety. The upper plastic layer 50 structurally acts as a buffer and support. It can absorb and disperse the mechanical stress applied to the first electrode post 32 during battery assembly and use, reducing the risk of wear and deformation of the electrode post, thereby extending battery life. Furthermore, the upper plastic layer 50 can enhance the battery's sealing performance. By providing an additional sealing layer at critical locations, the upper plastic layer 50 helps prevent electrolyte leakage, further improving battery safety and reliability.

[0066] In some embodiments, 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 second electrode post 33. One end of the tab 22 is connected to the electrode body 21, and the other end is connected to the side of the second body 332 opposite to the second electrode post 33. It should be noted that, as the core component of the battery, the electrode body 21 is responsible for carrying out electrochemical reactions to store and release electrical energy, and its connection with the first electrode post 32 ensures effective current conduction. The tab 22 is used to conduct current from the electrode body 21 to the external circuit. Through this connection method, the tab 22 not only ensures smooth current conduction but also provides flexibility to adapt to mechanical stress and thermal expansion that may occur during battery use. Furthermore, the tab 22 is tightly fitted between the electrode body 21 and the second body 332, effectively reducing its axial length in the overall battery structure.

[0067] 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.

[0068] 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.

[0069] 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 of other embodiments.

[0070] 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 in the receiving cavity and includes a first body and a second body. The first body partially passes through the first mounting hole and is connected to the first electrode post. The second body is disposed on both sides of the first body along the width direction of the cover plate body and is connected to the first body. The electrode assembly is connected to the side of the second body opposite to the first electrode post. A sealing ring is disposed at the connection between the first pole and the second pole, and abuts against the cover plate body.

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 opposite to the electrode assembly; A protrusion is disposed on the side of the first electrode post body facing the electrode assembly and connected to the first electrode post body, and partially passes through the first mounting hole; The cover plate assembly has a second mounting hole that penetrates the first body along the thickness direction of the cover plate body, and a portion of the protrusion 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 first body includes: The first mating layer partially passes through the first assembly hole and connects with the protrusion. The side of the first mating layer facing the first pole post abuts against the first pole post, and the side of the first mating layer facing the wall of the first assembly hole abuts against the sealing ring. The second mating layer is connected to the first mating layer, and the outer wall of the second mating layer abuts against the sealing ring; The third mating layer is connected to the second mating layer, and the end face of the third mating layer facing the first pole post abuts against the sealing ring; the second body is disposed on both sides of the third mating layer along the width direction of the cover plate body and is connected to the third mating layer; The first mating layer, the second mating layer, and the third mating layer are arranged in a stepped manner along the thickness direction of the cover plate body, and the second assembly hole penetrates the first mating layer, the second mating layer, and the third mating layer.

4. The single-cell battery according to claim 3, characterized in that, The sealing ring includes: A first sealing layer is disposed at the connection between the first pole post and the second pole post. The inner wall of the first sealing layer abuts against the outer wall of the first mating layer, and the outer wall of the first sealing layer abuts against the wall of the first assembly hole. A connecting part is provided along the thickness direction of the cover plate body. One end of the connecting part is connected to the first sealing layer. The side of the connecting part facing the second pole post abuts against the outer wall of the second mating layer. The side of the connecting part away from the second pole post abuts against the hole wall of the first assembly hole. The second sealing layer is connected to the other end of the connecting part. The inner wall of the second sealing layer abuts against the outer wall of the second mating layer. The end face of the second sealing layer facing the first pole abuts against the side of the cover plate body facing the electrode assembly.

5. The single-cell battery according to claim 3, characterized in that, In the thickness direction of the cover plate body, the heights of the first mating layer, the second mating layer, and the third mating layer are all T1 mm, and the height of the second body is T2 mm, satisfying T1 > T2.

6. The single-cell battery according to claim 4, characterized in that, In the thickness direction of the cover plate body, the end face of the second mating layer facing the first electrode post is higher than the end face of the cover plate body facing the electrode assembly.

7. The single-cell battery according to claim 1, characterized in that, The single battery also includes an upper plastic layer, which is disposed between the first electrode post and the cover plate body, and part of the upper plastic layer covers the outer peripheral surface of the first electrode post.

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 tab has one end connected to the electrode body and the other end connected to the side of the second body away from the second electrode post.

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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