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 accommodating cavity; the cover plate assembly comprises a cover plate body, a pole and a connecting piece, 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 pole penetrates through the first assembly hole and is connected with the connecting piece; the connecting piece comprises a first connecting part and a second connecting part which are connected with each other, the first connecting part penetrates through the first assembling hole and is connected with the pole column, part of the second connecting part can be bent by theta degrees relative to the first connecting part, theta degrees are larger than or equal to 0 and smaller than or equal to 90 degrees, and the electrode assembly is connected with the side, away from the electrode assembly, of the second connecting part; and the sealing ring is arranged at the joint of the pole and the connecting piece and abuts against the cover plate body. According to the embodiment, the electric connection between the electrode assembly and the pole is realized by arranging the connecting piece, and meanwhile, 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 a battery is generally a connection between the shell and the terminal post, which is then welded to the connecting piece. This results in low performance and yield. Furthermore, the traditional riveting method is subject to instantaneous impact during riveting, which seriously affects the stability of the explosion-proof valve. In addition, the presence of the riveting block seriously occupies axial space, resulting in 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, an electrode post, and a connector. The cover plate body covers the receiving cavity and is connected to the housing. The cover plate body has a first mounting hole. The electrode post passes through the first mounting hole and is connected to the connector. The connector includes a first connecting part and a second connecting part connected to each other. The first connecting part passes through the first mounting hole and is connected to the electrode post. A portion of the second connecting part can be bent at θ° relative to the first connecting part, satisfying 0≤θ°≤90°. The electrode assembly is connected to the side of the second connecting part opposite to the electrode assembly.

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

[0010] In some embodiments, the second connecting portion includes:

[0011] A first body is disposed on the side of the first connecting portion facing the electrode assembly and is connected to the first connecting portion;

[0012] The second body is disposed on both sides of the first body along the width direction of the cover plate body and connected to the first body, and the second body is electrically connected to the electrode assembly;

[0013] A bending portion is disposed between the first body and the second body, and is connected to the first body and the second body respectively. The bending portion causes the second body to bend at θ° relative to the first body.

[0014] In some embodiments, the second connection portion has a through hole that extends through the bending portion, and the bending portion deforms through the through hole to cause the second body to bend at θ° relative to the first body toward the electrode assembly.

[0015] In some embodiments, the pole includes:

[0016] The electrode post body is disposed on the side of the cover plate body opposite to the electrode assembly;

[0017] A protrusion is provided on the side of the electrode body facing the electrode assembly and is connected to the electrode body, and partially passes through the first mounting hole;

[0018] The cover plate assembly has a second mounting hole that extends through the connector 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.

[0019] In some embodiments, the first connecting portion includes:

[0020] 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 pole post abuts against the pole post, and the side of the first mating layer facing the wall of the first assembly hole abuts against the sealing ring.

[0021] 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;

[0022] The third mating layer is connected to the second mating layer, and the end face of the third mating layer facing the pole abuts against the sealing ring; the third mating layer is provided with the second connecting part on both sides of the cover plate body in the width direction;

[0023] 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.

[0024] In some embodiments, the sealing ring includes:

[0025] A first sealing layer is disposed at the connection between the pole post and the connector. 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.

[0026] 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 connector abuts against the outer wall of the second mating layer. The side of the connecting part away from the connector abuts against the wall of the first assembly hole.

[0027] 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 side end of the second sealing layer facing the pole abuts against the cover plate body.

[0028] In some embodiments, in the thickness direction of the cover plate body, the height of the first mating layer is T1mm, satisfying 1.2mm≤T1≤2.5mm; the height of the second mating layer is T2mm, satisfying 1.2mm≤T2≤2.5mm; the height of the third mating layer is T3mm, satisfying 1.2mm≤T3≤2.5mm; and the height of the second connecting portion is T4mm, satisfying 0.2mm≤T4≤1.8mm.

[0029] In some embodiments, the single battery cell further includes an upper plastic layer disposed between the terminal post and the cover plate body, and a portion of the upper plastic layer covers the outer peripheral surface of the terminal post.

[0030] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0031] 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.

[0032] Several embodiments of this application have one of the following beneficial effects:

[0033] 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 terminal post, and a connector; the cover body covers the receiving cavity and is connected to the casing, and the cover body has a first mounting hole; the terminal post passes through the first mounting hole and is connected to the electrode assembly; the connector includes a first connecting portion and a second connecting portion; the first connecting portion passes through the first mounting hole and is connected to the terminal post, and the second connecting portion is connected to the first connecting portion, and a portion of the second connecting portion can be bent at an angle of θ° relative to the first connecting portion, satisfying 0≤θ°≤90°; the electrode assembly is connected to the side of the second connecting portion away from the electrode assembly; the sealing ring is disposed at the connection between the terminal post and the connector and abuts against the cover body. This embodiment uses a connector to replace a portion of the existing terminal post, and through the connection between the connector and the terminal post and the electrical connection between the connector and the electrode assembly, the electrical connection between the electrode assembly and the terminal post is achieved, while simultaneously improving the space utilization rate of the single-cell battery.

[0034] 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.

[0035] 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

[0036] 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.

[0037] Figure 1 A cross-sectional view of a single battery cell provided in an embodiment of this application from one angle;

[0038] Figure 2 A cross-sectional structural diagram of the cover plate assembly provided in the embodiments of this application;

[0039] Figure 3 This is an overall structural diagram of the cover plate assembly provided in an embodiment of this application from one angle;

[0040] Figure 4 A cross-sectional view of a single battery cell provided in an embodiment of this application from another angle;

[0041] Figure 5 This is an overall structural view of the cover plate assembly provided in an embodiment of this application from another angle;

[0042] Figure 6 This is a diagram showing the second body after bending, provided in an embodiment of this application.

[0043] Figure 7 The diagram shows the parameters provided in the embodiments 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-Pole post; 321-Pole post body; 322-Protrusion; 33-Connector; 331-First connecting part; 3311-First mating layer; 3312-Second mating layer; 3313-Third mating layer; 332-Second connecting part; 3321-First body; 3322-Second body; 3323-Bending part; 3324-Through hole; 34-Second mounting hole;

[0048] 40 - Sealing ring; 41 - First sealing layer; 42 - Connecting part; 43 - Second sealing layer;

[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 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.

[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 Figures 1 to 7 One type of single-cell battery in the embodiments of this application, such as Figure 1 , Figure 5 , Figure 7As shown, the single-cell 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 terminal post 32, and a connector 33. The cover body 31 covers the receiving cavity 11 and connects to the housing 10. The cover body 31 has a first mounting hole 311. The terminal post 32 passes through the first mounting hole 311 and connects to the connector 33. The connector 33 includes a first connecting portion 331 and a second connecting portion 332 connected together. The first connecting portion 331 passes through the first mounting hole 311 and connects to the terminal post 32, and a portion of the second connecting portion 332 can be bent at an angle θ° relative to the first connecting portion 331, satisfying 0 ≤ θ° ≤ 90°. The electrode assembly 20 is connected to the side of the second connecting portion 332 away from the electrode assembly 20. The sealing ring 40 is disposed at the connection between the terminal post 32 and the connector 33 and abuts against the cover body 31.

[0057] It should be noted that the electrode post 32 is a copper-aluminum composite electrode post 32. It can be understood that the copper-aluminum composite negative electrode post 32 has good electrothermal performance, corrosion resistance, wear resistance, and plasticity, which can meet the high-efficiency electronic characteristics and safety requirements of new energy batteries. The electrode assembly 20 includes an electrode body 21 and a tab 22. The electrode body 21 is located within the receiving cavity 11, one end of the tab 22 is electrically connected to the electrode body 21, and the other end of the tab 22 is electrically connected to the electrode post 32.

[0058] In view of this, this embodiment eliminates the riveting assembly of the connecting piece 33, which replaces part of the existing electrode post 32. Simultaneously, through the connection between the connecting piece 33 and the electrode post 32, and the connection between the connecting piece 33 and the electrode assembly 20, electrical connection between the electrode assembly 20 and the electrode post 32 can be achieved. Compared to the existing method, this reduces the axial space occupied by the individual battery, improving the space utilization of the individual battery. In this embodiment, the electrode post 32 is welded to the busbar, allowing the internal current to be directly led out, shortening the current flow path, reducing the battery's internal resistance, and improving product performance; it also shortens the product assembly process, reduces product cost, and enhances product competitiveness. Furthermore, a portion of the second connecting part 332 can be bent at θ° relative to the first connecting part 331. Before welding the tab 22 of the electrode assembly 20, the second connecting part 332 can be bent at θ° relative to the first connecting part 331, facilitating the welding of the tab 22 to the side of the second connecting part 332 facing the cover plate body 31. After the tab 22 is welded, the second connecting part 332 is bent again until it is approximately 180° to the first connecting part 331. That is, this embodiment not only improves the space utilization of the single cell, but also facilitates the welding of the tab 22 and has better adaptability.

[0059] In some embodiments, such as Figure 2 , Figure 3 , Figure 6 As shown, the second connecting portion 332 includes a first body 3321, a second body 3322, and a bending portion 3323. The first body 3321 is disposed on the side of the first connecting portion 331 facing the electrode assembly 20 and is connected to the first connecting portion 331, serving as a connection and support. The first body 3321 is the basic part of the second connecting portion 332, and its connection with the electrode post 32 ensures current conduction. The second body 3322 is disposed on both sides of the first body 3321 along the width direction of the cover body 31 and is connected to the first body 3321. The second body 3322 is electrically connected to the electrode assembly 20 and is responsible for conducting current from the electrode assembly 20 to the electrode post 32. The position and orientation design of the second body 3322 helps to optimize the current path and the utilization of the internal space of the battery. A bending portion 3323 is disposed between the first body 3321 and the second body 3322, and is connected to both the first body 3321 and the second body 3322 respectively. The bending portion 3323 causes the second body 3322 to bend relative to the first body 3321 by θ°. The function of the bending portion 3323 is to allow the second body 3322 to bend relative to the first body 3321 by θ°. This design allows the second body 3322 to be adjusted to a suitable angle when welding the tabs 22 of the electrode assembly 20, facilitating the welding operation. After welding, the bending portion 3323 can restore the second body 3322 to a position close to 180°, ensuring the stability and reliability of the electrical connection.

[0060] In some embodiments, such as Figure 2 and Figure 3 As shown, the second connecting portion 332 has a through hole 3324 that penetrates the bending portion 3323, providing space and flexibility for deformation of the bending portion 3323. Through the through hole 3324, the bending portion 3323 can deform more easily, allowing the second body 3322 to bend at an angle θ° relative to the first body 3321 towards the electrode assembly 20. This design enhances the operability and flexibility of the bending portion 3323, making it easier to adjust the second body 3322 to the required angle when welding the tabs 22 of the electrode assembly 20. This not only simplifies the welding operation but also ensures the accuracy and reliability of the welding. The presence of the through hole 3324 allows the bending portion 3323 to better distribute stress during deformation, reducing the risk of material fatigue and damage, thereby improving the stability and durability of the electrical connection. This structural design makes the battery assembly and operation process more efficient, while also improving the overall performance and safety of the battery.

[0061] In some embodiments, such as Figure 1As shown, the terminal post 32 includes a terminal post body 321 and a protrusion 322. The terminal post body 321 is located on the side of the cover plate body 31 facing away from the electrode assembly 20, providing a stable foundation structure for connecting the external circuit and the internal electrode assembly 20 of the battery. The terminal post body 321 is one of the main channels for current conduction. The protrusion 322 is located on the side of the terminal post body 321 facing the electrode assembly 20 and is connected to the terminal post body 321. The protrusion 322 partially passes through the first mounting hole 311. This design allows the protrusion 322 to be tightly engaged with the cover plate body 31, ensuring the stable installation of the terminal post 32 and the reliability of the electrical connection. The cover plate assembly 30 has a second mounting hole 34, which extends through the connector 33 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. This structural design further enhances the fixation of the terminal post 32 and the stability of the electrical connection. Through the second mounting hole 34, the protrusion 322 can be more securely embedded in the cover plate assembly 30, reducing loosening or poor contact caused by vibration or external force.

[0062] In some embodiments, such as Figure 4 As shown, the first connecting portion 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 the first mounting hole 311 and connects with the protrusion 322. The end face of the first mating layer 3311 facing the pole post 32 abuts against the pole post 32, and the side of the first mating layer 3311 facing the wall of the first mounting hole 311 abuts against the sealing ring 40. The second mating layer 3312 is connected to the first mating layer 3311, and the outer wall of the second mating layer 3312 abuts against the sealing ring 40. The third mating layer 3313 is connected to the second mating layer 3312, and the end face of the third mating layer 3313 facing the pole post 32 abuts against the sealing ring 40. The third mating layer 3313 has second connecting portions 332 on both sides of the cover plate body 31 in the width direction. 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, and the second assembly hole 34 penetrates the first mating layer 3311, the second mating layer 3312, and the third mating layer 3313.

[0063] It should be noted that the design of the first mating layer 3311 ensures that one end face abuts against the terminal post 32, guaranteeing the stability of the electrical connection. Simultaneously, the other end face of the first mating layer 3311 abuts against the sealing ring 40, providing an effective seal to prevent electrolyte leakage or external air ingress. The second mating layer 3312 further enhances the sealing effect, ensuring that the battery's sealing performance remains unaffected under different operating conditions. The end face of the third mating layer 3313 facing the terminal post 32 also abuts against the sealing ring 40. This layer not only continues to provide sealing support but also provides second connecting portions 332 on both sides of the cover body 31 in the width direction, enhancing the overall structural stability. These mating layers are arranged in a stepped manner along the thickness direction of the cover body 31; this design helps to disperse stress and reduce structural damage caused by thermal expansion or mechanical vibration. The second mounting hole 34 penetrates all three mating layers, ensuring that the protrusion 322 can be firmly embedded and tightly bonded to each layer.

[0064] In some embodiments, such as Figure 2 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 pole post 32 and the connector 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 assembly hole 311. 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 connector 33 abuts against the outer wall of the second mating layer 3312, and the side of the connecting portion 42 away from the connector 33 abuts against the wall of the first assembly hole 311. 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 pole post 32 abuts against the cover plate body 31.

[0065] It should be noted that the first sealing layer 41 is disposed at the connection between the terminal post 32 and the connector 33. Its inner wall abuts against the outer wall of the first mating layer 3311, while its outer wall abuts against the wall of the first mounting hole 311. The main function of this layer is to provide a primary seal, preventing leakage of electrolyte inside the battery or the entry of external air, thereby protecting the internal environment of the battery. The connecting portion 42 is disposed along the thickness direction of the cover plate body 31, with one end connected to the first sealing layer 41. The side of the connecting portion 42 facing the connector 33 abuts against the outer wall of the second mating layer 3312, while the side away from the connector 33 abuts against the wall of the first mounting hole 311. The design function of the connecting portion 42 is to provide a transition area, ensuring the sealing effect of the sealing ring 40 between different layers, and also helping to disperse stress and reduce sealing failure caused by thermal expansion or mechanical vibration. The second sealing layer 43 is connected to the other end of the connecting portion 42, with its inner wall abutting against the outer wall of the second mating layer 3312, and its end face facing the terminal post 32 abutting against the cover plate body 31. The second sealing layer 43 provides additional sealing support, ensuring the integrity of the seal between the terminal post 32 and the cover plate body 31. This layer further enhances the overall sealing effect, ensuring the safety and reliability of the battery under various operating conditions. In other words, the design of these structures, through multi-layered sealing and transition connections, ensures the sealing performance and structural stability of the battery assembly, thereby improving battery safety and lifespan.

[0066] In some embodiments, such as Figure 7 As shown, in the thickness direction of the cover plate body 31, the height of the first mating layer 3311 is T1 mm, satisfying 1.2 mm ≤ T1 ≤ 2.5 mm. This height range ensures that the first mating layer 3311 can provide sufficient structural support and sealing effect, while avoiding excessive increase in the thickness of the cover plate body 31, thereby keeping the overall size and weight of the battery within a reasonable range. The height of the second mating layer 3312 is T2 mm, satisfying 1.2 mm ≤ T2 ≤ 2.5 mm. Similar to the first mating layer 3311, the height design of the second mating layer 3312 is also designed to provide sufficient support and sealing effect. It works together with the first mating layer 3311 to ensure the sealing performance and structural integrity of the battery under different operating conditions. The height of the third mating layer 3313 is T3 mm, satisfying 1.2 mm ≤ T3 ≤ 2.5 mm. The height design of the third mating layer 3313 not only continues to provide sealing support, but also helps to disperse stress and reduce structural damage caused by thermal expansion or mechanical vibration through its stepped structural design. The height of the second connecting part 332 is T4mm, satisfying 0.2mm≤T4≤1.8mm. The relatively small height of the second connecting part 332 mainly serves to provide additional connection support, enhance the stability of the overall structure, and ensure that the thickness of the cover plate body 31 is not significantly increased. In addition, the second connecting part 332 provides a welding area for welding the electrode tab 22.

[0067] In some embodiments, the single-cell battery also includes an upper plastic 50, which is disposed between the terminal post 32 and the cover plate body 31, and partially covers the outer peripheral surface of the terminal post 32. It should be noted that the upper plastic 50 provides additional insulation protection. By covering the outer peripheral surface of the terminal post 32, the upper plastic 50 effectively prevents current leakage inside the battery, ensuring battery safety and stable electrical performance. The upper plastic 50 helps enhance the sealing effect. Filling the space between the terminal post 32 and the cover plate body 31, it further prevents electrolyte leakage and the entry of external air, thereby protecting the internal environment of the battery. Furthermore, the upper plastic 50 also acts as a buffer. It provides a certain degree of flexible support between the terminal post 32 and the cover plate body 31, absorbing and mitigating stress caused by thermal expansion, mechanical vibration, or external impact, thereby reducing damage to the battery structure.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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, an electrode post, and a connector. The cover plate body covers the receiving cavity and is connected to the housing. The cover plate body has a first mounting hole. The electrode post passes through the first mounting hole and is connected to the connector. The connector includes a first connecting part and a second connecting part connected to each other. The first connecting part passes through the first mounting hole and is connected to the electrode post. A portion of the second connecting part can be bent at θ° relative to the first connecting part, satisfying 0≤θ°≤90°. The electrode assembly is connected to the side of the second connecting part opposite to the electrode assembly. A sealing ring is provided at the connection between the pole and the connector, and abuts against the cover plate body.

2. The single-cell battery according to claim 1, characterized in that, The second connecting part includes: A first body is disposed on the side of the first connecting portion facing the electrode assembly and is connected to the first connecting portion; The second body is disposed on both sides of the first body along the width direction of the cover plate body and connected to the first body, and the second body is electrically connected to the electrode assembly; A bending portion is disposed between the first body and the second body, and is connected to the first body and the second body respectively. The bending portion causes the second body to bend at θ° relative to the first body.

3. The single-cell battery according to claim 2, characterized in that, The second connecting portion has a through hole that penetrates the bending portion. The bending portion deforms through the through hole to cause the second body to bend at θ° relative to the first body toward the electrode assembly.

4. The single-cell battery as described in claim 1, characterized in that, The pole includes: The electrode post body is disposed on the side of the cover plate body opposite to the electrode assembly; A protrusion is provided on the side of the electrode body facing the electrode assembly and is connected to the electrode body, and partially passes through the first mounting hole; The cover plate assembly has a second mounting hole that extends through the connector 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.

5. The single-cell battery as described in claim 4, characterized in that, The first connecting part 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 pole post abuts against the 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 pole abuts against the sealing ring; the third mating layer is provided with the second connecting part on both sides of the cover plate body in the width direction; 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.

6. The single-cell battery according to claim 5, characterized in that, The sealing ring includes: A first sealing layer is disposed at the connection between the pole post and the connector. 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 connector abuts against the outer wall of the second mating layer. The side of the connecting part away from the connector abuts against the 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 side end of the second sealing layer facing the pole abuts against the cover plate body.

7. The single-cell battery according to claim 5, characterized in that, In the thickness direction of the cover plate body, the height of the first mating layer is T1mm, satisfying 1.2mm≤T1≤2.5mm; the height of the second mating layer is T2mm, satisfying 1.2mm≤T2≤2.5mm; the height of the third mating layer is T3mm, satisfying 1.2mm≤T3≤2.5mm; and the height of the second connecting part is T4mm, satisfying 0.2mm≤T4≤1.8mm.

8. 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 electrode post and the cover plate body, and part of the upper plastic layer covers the outer peripheral surface of the 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.

Images