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, a cover plate assembly and an insulating tape, and the shell is provided with an accommodating cavity; the cover plate assembly comprises a cover plate body and a collection area, the cover plate body covers the containing cavity, and the collection area is arranged on the side, away from the shell, of the cover plate body; the insulating tape comprises a first insulating part and a second insulating part which cover the shell, and the second insulating part is arranged around the cover plate body; the second insulating part comprises a first cutting lug and a second cutting lug, the first cutting lug and the second cutting lug are arranged around the acquisition area, one end of each of the first cutting lug and the second cutting lug is connected with the first insulating part, and the other end of the first cutting lug is in lap joint with the other end of the second cutting lug; due to the design of the first cutting lug and the second cutting lug and the lap joint of the first cutting lug and the second cutting lug, double protection of insulation and upwarp prevention is provided, and the safety and the reliability of the single battery are enhanced.

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] Currently, to improve the energy density of the entire battery pack, the thickness of individual cells is becoming increasingly thinner, resulting in smaller top cover sizes. Furthermore, with continuous optimization of the overall pack design, in addition to standard features like terminals, explosion-proof valves, and electrolyte injection holes, the cover plate is increasingly incorporating NTC temperature sensing areas and nickel plate welding voltage sensing areas. This necessitates more and more space on the cover plate, severely limiting the width of the blue film insulating tape that can be folded onto it. Consequently, more and more peeling issues arise after wrapping. Especially because the sensing area occupies a large area, the blue film insulating tape cannot meet the basic adhesion requirements in this area, leading to poor insulation performance and easy peeling of the insulating tape after wrapping. This also causes the top cover patch to peel and detach. Utility Model Content

[0003] This application provides a single battery cell, aiming to overcome the technical problem that the insulating tape wrapping film is prone to peeling in the collection area; another objective of this application is to provide a battery pack; yet another objective of this application is to provide an electrical device.

[0004] Embodiments of this application provide a single-cell battery, comprising:

[0005] A housing having a receiving cavity;

[0006] A cover plate assembly includes a cover plate body and a collection area, wherein the cover plate body covers the receiving cavity, and the collection area is disposed on the side of the cover plate body opposite to the housing;

[0007] Insulating tape, the insulating tape comprising a first insulating portion covering the housing and a second insulating portion surrounding the cover plate body;

[0008] The second insulating part includes a first cut and a second cut, which are arranged around the collection area. One end of the first cut and the second cut are connected to the first insulating part, and the other end of the first cut and the other end of the second cut overlap each other.

[0009] In some embodiments, the second insulating portion has a clearance opening located within the area enclosed by the first and second cut ears, exposing the collection area.

[0010] In some embodiments, the cover plate body includes a first pole hole for the pole to pass through;

[0011] The second insulating part has a first clearance groove, which communicates with the first pole hole, and the pole is inserted through the first pole hole and the first clearance groove.

[0012] In some embodiments, the cover plate assembly further includes an explosion-proof valve, which is disposed on the cover plate body and connected to the cover plate body;

[0013] The second insulating part has a second clearance groove, and the explosion-proof valve passes through the second clearance groove.

[0014] In some embodiments, the single battery cell further includes an insulating patch disposed on the side of the cover assembly opposite to the housing, covering the second insulating portion and connected to the second insulating portion.

[0015] In some embodiments, the insulating patch has a second pole hole, the second pole hole, the first pole hole, and the first clearance groove are interconnected, and the pole is disposed in the first pole hole, the first clearance groove, and the second pole hole.

[0016] In some embodiments, the insulating patch has a third clearance groove that exposes the explosion-proof valve and the collection area.

[0017] In some embodiments, the overlap area between the first cut-out ear and the second cut-out ear is spaced L in the width direction of the cover plate body, satisfying 3mm≤L≤5mm.

[0018] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0019] 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.

[0020] Several embodiments of this application have one of the following beneficial effects:

[0021] An embodiment of this application provides a single-cell battery, including a casing, a cover assembly, and insulating tape. The casing has a receiving cavity; the cover assembly includes a cover body and a collection area, the cover body sealing the receiving cavity, and the collection area being disposed on the side of the cover body away from the casing; the insulating tape includes a first insulating portion and a second insulating portion covering the casing, the second insulating portion surrounding the cover body; the second insulating portion includes a first cutout and a second cutout, the first and second cutouts surrounding the collection area, one end of each cutout being connected to the first insulating portion, and the other end of the first cutout overlapping with the other end of the second cutout; the design of the first and second cutouts in this application satisfies the insulation requirements at the collection area, allowing the insulating tape to form better insulation protection around the collection area; the overlap of the first and second cutouts creates mutual tension and increases the coverage area of ​​the insulating tape, solving the problem of easy lifting; this design provides dual protection of insulation and anti-lifting, enhancing the safety and reliability of the single-cell battery.

[0022] 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.

[0023] 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

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the exploded structure of a single cell in the prior art;

[0026] Figure 2 This is a schematic diagram of the overall structure of the insulating tape provided in the embodiments of this application;

[0027] Figure 3 This is a schematic diagram of the exploded structure of a single battery provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the overall structure after the insulating patch is covered, as provided in the embodiments of this application;

[0029] Figure 5 Provided for the embodiments of this application Figure 3 A magnified view of a section at point A in the middle;

[0030] Figure label:

[0031] 1-Cover plate; 2-Outer shell; 3-Blue film insulating tape; 4-Top cover patch;

[0032] 10 - Shell;

[0033] 20-Cover plate assembly; 21-Cover plate body; 211-First pole post hole; 22-Collection area; 23-Pole post; 24-Explosion-proof valve;

[0034] 30 - Insulating tape; 31 - First insulating part; 32 - Second insulating part; 321 - First cut-out; 322 - Second cut-out; 323 - Clearance opening; 324 - First clearance groove; 325 - Second clearance groove;

[0035] 40 - Insulating patch; 41 - Second pole hole; 42 - Third clearance groove. Detailed Implementation

[0036] 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.

[0037] 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 these processes, methods, products, or devices.

[0038] 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.

[0039] As a preamble to the embodiments of this application, lithium-ion batteries, due to their advantages such as large capacity, high operating voltage, strong charge retention capability, and long cycle life, are currently widely used in various fields such as transportation power supplies, power storage power supplies, new energy storage power supplies, and aerospace and military industries. Please refer to... Figure 1 , Figure 1 This is a schematic diagram of the exploded structure of a single battery cell in the prior art provided in this application embodiment. A single battery cell typically includes: a casing 2, electrode assembly, a cover plate 1, blue insulating tape 3, and a top cover patch 4, etc. The electrode assembly is disposed inside the casing 2, and the cover plate 1 and casing 2 are fixed together by welding, forming a sealed space with a certain mechanical strength to protect the electrode assembly; the blue insulating tape 3 mainly covers the outside of the casing 2, achieving external insulation of the cell casing. It should be noted that, for better illustration of the structure of a single battery cell, Figure 1 Only a portion of the inner shell 2 is shown.

[0040] To improve the overall energy density of individual battery packs, the thickness of individual cells is becoming increasingly thinner, resulting in a smaller and smaller cover plate 1. Furthermore, with continuous optimization of the overall pack design, in addition to the conventional terminals, explosion-proof valves, and electrolyte injection holes, cover plate 1 now includes NTC temperature sensing areas and nickel sheet welding voltage sensing areas, requiring more and more space. Simultaneously, with the rapid development of fast charging technology, the demand for overcurrent at the terminals is constantly increasing, requiring larger terminal dimensions. This severely limits the width of the blue film insulating tape 3 that can be folded onto cover plate 1, leading to an increasing problem of peeling after wrapping. Especially because the sensing area occupies a large area, the blue film insulating tape 3 cannot meet the basic adhesion requirements at the sensing area, resulting in poor insulation and easy peeling after wrapping, causing many problems for subsequent production.

[0041] 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.

[0042] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the overall structure of the insulating tape provided in the embodiments of this application. Figure 3This is an exploded structural diagram of a single battery provided in an embodiment of this application. A single battery in this embodiment includes a housing 10, a cover assembly 20, and insulating tape 30. The housing 10 has a receiving cavity; the cover assembly 20 includes a cover body 21 and a collection area 22, the cover body 21 covering the receiving cavity, and the collection area 22 being disposed on the side of the cover body 21 facing away from the housing 10; the insulating tape 30 includes a first insulating portion 31 covering the housing 10 and a second insulating portion 32 surrounding the cover body 21; the second insulating portion 32 includes a first cutout 321 and a second cutout 322, the first cutout 321 and the second cutout 322 surrounding the collection area 22, one end of each cutout 321 and the second cutout 322 being connected to the first insulating portion 31, and the other end of the first cutout 321 overlapping the other end of the second cutout 322.

[0043] It should be noted that, in order to better illustrate the structure of a single battery cell, Figure 2 Only a portion of the housing 10 is shown; in practice, the first insulating part 31 completely covers the outer wall of the housing 10. The cover plate body 21 can be made of plain aluminum plate. The cover plate body 21 and the housing 10 can be fixedly connected by welding. After welding, the cover plate body 21 and the housing 10 form a sealed space with a certain mechanical strength, which is the receiving cavity, and the electrode assembly is installed inside the receiving cavity. The insulating tape 30 includes a PET (polyester) film and pressure-sensitive adhesive, and is produced by coating the PET film with pressure-sensitive adhesive. The PET film is a polyester film with good insulation properties. The pressure-sensitive adhesive is a sticky adhesive used to fix the PET film to the cover plate body 21 and the housing 10.

[0044] In view of this, this embodiment solves the problem of limited width of the blue film insulating tape when folded onto the cover plate in the prior art. As the thickness of individual cells becomes thinner and the width of the cover plate decreases, more components need to be installed on the cover plate, especially the collection area 22. Because the collection area 22 occupies a large area, the coverage area of ​​the blue film insulating tape cannot meet the basic bonding requirements and is prone to peeling. This embodiment solves these problems by overlapping the first cutout 321 and the second cutout 322 in the second insulating part 32 to increase the coverage area. Furthermore, the insulating tape 30 includes a first insulating part 31 and a second insulating part 32. The second insulating part 32 surrounds the cover plate body 21 and includes the first cutout 321 and the second cutout 322. This design allows the insulating tape 30 to form better insulation protection around the collection area 22, improving the safety performance of the individual cells. Using PET film and pressure-sensitive adhesive as the materials for the insulating tape 30, the PET film has good insulation properties, while the pressure-sensitive adhesive has adhesiveness, which can effectively fix the second insulating part 32 to the cover plate body 21.

[0045] In some embodiments, such as Figure 3As shown, the second insulating part 32 has a clearance opening 323, which is located within the area enclosed by the first chamfer 321 and the second chamfer 322, exposing the acquisition area 22. It should be noted that the acquisition area 22 can be used for different types of acquisition, such as an NTC temperature sensing acquisition area or a nickel plate welding voltage acquisition area. When it is an NTC temperature sensing acquisition area: In some embodiments, the acquisition area 22 can be used to install an NTC (Negative Temperature Coefficient) temperature sensor. The NTC temperature sensing acquisition area is used to monitor the temperature of a single cell. By installing an NTC temperature sensor in the acquisition area 22, the temperature change of the single cell can be monitored in real time, and the temperature data can be transmitted to the battery management system for temperature control and protection. Another possible type of acquisition area is an area for welding voltage acquisition. In this case, the acquisition area 22 can be used to install nickel plates connected to the positive and negative electrodes of the single cell. These nickel plates can be used to measure the voltage of the single cell and transmit the voltage data to the battery management system for voltage monitoring and state estimation. Through the acquisition area 22, real-time monitoring and acquisition of parameters such as battery temperature or voltage can be achieved. These data are crucial for assessing the safety performance and condition of individual cells, enabling the battery management system to provide precise control and protection, ensuring normal operation and extending the lifespan of each cell. The design of the clearance opening 323 provides more space, making the acquisition area 22 easier to access and operate. This design facilitates the connection and acquisition of electrical signals or data related to the acquisition area 22, improving the functionality and operability of the individual cell. Furthermore, the clearance opening 323 design eliminates the need for insulating tape 30 between the two sides of the acquisition area 22 along the length of the cover body 21, thus avoiding the problem of easy lifting due to insufficient adhesive tape coverage. The design of the first cut ear 321 and the second cut ear 322, as well as the overlap between them, meets the insulation requirements at the acquisition area 22 and solves the problem of easy lifting. This design provides dual protection of insulation and anti-lifting, enhancing the safety and reliability of the individual cell.

[0046] In some embodiments, such as Figure 3As shown, the cover plate body 21 includes a first electrode post hole 211 for the electrode post 23 to pass through; the second insulating part 32 has a first clearance groove 324, which communicates with the first electrode post hole 211, and the electrode post 23 passes through the first electrode post hole 211 and the first clearance groove 324. It should be noted that by providing the first electrode post hole 211 on the cover plate body 21, the electrode post 23 can pass through the first electrode post hole 211 and connect with the electrode assembly inside the housing 10. This design facilitates the installation and connection of the electrode post 23 and improves the assembly efficiency of the single cell. The first clearance groove 324 communicates with the first electrode post hole 211, and the electrode post 23 passes through the first electrode post hole 211 and the first clearance groove 324. This design avoids direct contact between the electrode post 23 and the second insulating part 32, reduces the possible short circuit risk, and improves the safety performance of the single cell. In view of this, the cover plate body 21 includes a first electrode hole 211 for the electrode post 23 to pass through, and the second insulating part 32 has a first clearance groove 324. This design has the advantages of providing a passage for the electrode post 23 in a single cell and avoiding the risk of short circuit. These advantages help to improve the assembly efficiency and safety performance of the single cell.

[0047] In some embodiments, such as Figure 3 As shown, the cover assembly 20 also includes an explosion-proof valve 24, which is disposed on and connected to the cover body 21; the second insulating part 32 has a second clearance groove 325, through which the explosion-proof valve 24 passes. It should be noted that the explosion-proof valve 24 can release pressure when overpressure or overheating occurs inside the individual battery, preventing the individual battery from exploding or leaking. By placing the explosion-proof valve 24 on and connecting it to the cover body 21, the pressure inside the individual battery can be better controlled and managed, improving the safety performance of the individual battery.

[0048] In view of this, the second clearance groove 325 is designed in this embodiment to facilitate the explosion-proof valve 24 to pass through the second clearance groove 325 and avoid the second insulating part 32 from interfering with the explosion-proof valve 24.

[0049] In some embodiments, please refer to Figure 4 , Figure 4This is a schematic diagram of the overall structure after the insulating patch is applied according to an embodiment of this application. The single-cell battery also includes an insulating patch 40, which is disposed on the side of the cover assembly 20 facing away from the housing 10, covering and connecting to the second insulating portion 32. It should be noted that the insulating patch 40 is disposed on the side of the cover body 21 facing away from the housing 10, covering and connecting to the second insulating portion 32. The insulating patch 40 provides additional insulation protection, preventing direct contact between the electrode groups or other components inside the single-cell battery and the external environment or the housing 10. This helps reduce the risk of short circuits that may occur in the single-cell battery and improves the battery's safety performance. The connection between the insulating patch 40 and the second insulating portion 32 ensures that the insulating patch 40 is firmly covered on the second insulating portion 32 and is not easily loosened or detached. This helps maintain the stability and reliability of the internal components of the battery.

[0050] In view of this, in some embodiments, the single-cell battery also includes an insulating patch 40, which is disposed on the side of the cover body 21 opposite to the housing 10, covers the second insulating portion 32, and is connected to the second insulating portion 32. This design provides additional insulation protection and a secure connection in the single-cell battery. These advantages contribute to improving the safety and reliability of the single-cell battery.

[0051] In some embodiments, such as Figure 3 As shown, the insulating patch 40 has a second terminal hole 41, which, along with the first terminal hole 211 and the first clearance groove 324, are interconnected. The terminal 23 passes through the first terminal hole 211, the first clearance groove 324, and the second terminal hole 41. It should be noted that by providing the second terminal hole 41 on the insulating patch 40 and connecting it to the first terminal hole 211 and the first clearance groove 324, a passage for the terminal 23 is provided. This design facilitates the installation and connection of the terminal 23, improving the assembly efficiency of the single-cell battery. The presence of the first clearance groove 324 prevents direct contact between the terminal 23 and the insulating patch 40, reducing the potential risk of short circuits. By connecting the second terminal hole 41 to the first clearance groove 324 and the first terminal hole 211, it is ensured that the terminal 23 will not contact the insulating patch 40 during installation, further improving the safety performance of the single-cell battery.

[0052] In view of this, the insulating patch 40 in this embodiment has a second terminal hole 41, which is interconnected with the first terminal hole 211 and the first clearance groove 324. The terminal 23 can pass through the first terminal hole 211, the first clearance groove 324, and the second terminal hole 41. This design has the advantages of providing terminal channels and avoiding short-circuit risks in a single cell. These advantages help improve the assembly efficiency and safety performance of the single cell.

[0053] In some embodiments, the insulating patch 40 has a third clearance groove 42, which exposes the explosion-proof valve 24 and the data acquisition area 22. The third clearance groove 42 communicates with the clearance port 323 and the second clearance groove 325, respectively. It should be noted that the presence of the third clearance groove 42 provides space, allowing the explosion-proof valve 24 and the data acquisition area 22 to be exposed on the surface of the insulating patch 40. This design helps the explosion-proof valve 24 release pressure in the event of overpressure or overheating, thus protecting the battery's safety performance. Simultaneously, the exposure of the data acquisition area 22 facilitates battery monitoring and data acquisition. By placing the explosion-proof valve 24 and the data acquisition area 22 within the third clearance groove 42, direct contact and collisions are avoided, reducing the potential risk of damage. This helps improve the safety performance and reliability of the individual battery cells.

[0054] In some embodiments, please refer to Figure 5 , Figure 5 Provided for the embodiments of this application Figure 3 A magnified view of a portion at point A. The overlap area between the first cut-out ear 321 and the second cut-out ear 322 is spaced L in the width direction of the cover body 21, satisfying 3mm ≤ L ≤ 5mm. It should be noted that by setting the overlap area of ​​the first cut-out ear 321 and the second cut-out ear 322, the insulation requirements at the collection area 22 can be met. This design ensures that the individual battery will not experience current leakage or short circuit during operation, improving the safety performance of the individual battery. The tensile effect between the first cut-out ear 321 and the second cut-out ear 322 can prevent the cover body 21 and the insulating tape 30 from lifting during use. Lifting may cause loosening or damage to internal components of the individual battery, affecting its performance and lifespan. By controlling the spacing L of the overlap area, lifting can be effectively prevented, improving the stability and reliability of the individual battery.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The sealing caps 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 descriptions of the embodiments above are 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. 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, characterized by, The single battery comprises a shell (10) having a containing cavity; a cover plate assembly (20) comprising a cover plate body (21) and a collection area (22), the cover plate body (21) covers the containing cavity, and the collection area (22) is arranged on the side of the cover plate body (21) away from the shell (10); an insulation tape (30) comprising a first insulation part (31) covering the shell (10) and a second insulation part (32) surrounding the cover plate body (21); the second insulation part (32) comprises a first lug (321) and a second lug (322), the first lug (321) and the second lug (322) are arranged around the collection area (22), and one end of each of the first lug (321) and the second lug (322) is connected to the first insulation part (31), and the other end of the first lug (321) and the other end of the second lug (322) are overlapped with each other. The second insulation part (32) has a avoiding opening (323) located in the area surrounded by the first lug (321) and the second lug (322), and the collection area (22) is exposed. The cover plate body (21) comprises a first pole hole (211) for a pole (23) to pass through; The second insulation part (32) has a first avoiding groove (324) in communication with the first pole hole (211), and the pole (23) passes through the first pole hole (211) and the first avoiding groove (324). The cover plate assembly (20) further comprises an explosion-proof valve (24) arranged on the cover plate body (21) and connected to the cover plate body (21); 2. The unit cell of claim 1, wherein, The second insulation part (32) has a second avoiding groove (325), and the explosion-proof valve (24) passes through the second avoiding groove (325).

3. The unit cell of claim 2, wherein, The single battery further comprises an insulation patch (40) arranged on the side of the cover plate assembly (20) away from the shell (10), covering the second insulation part (32), and connected to the second insulation part (32). The insulation patch (40) has a second pole hole (41), the second pole hole (41), the first pole hole (211), and the first avoiding groove (324) are in communication with each other, and the pole (23) passes through the first pole hole (211), the first avoiding groove (324), and the second pole hole (41).

4. The unit cell of claim 3, wherein, The insulation patch (40) has a third avoiding groove (42) exposing the explosion-proof valve (24) and the collection area (22). The overlapped area of the first lug (321) and the second lug (322) has a distance L in the width direction of the cover plate body (21), and 3mm≤L≤5mm is satisfied.

5. The unit cell of claim 4, wherein, The single battery comprises a shell (10) having a containing cavity; a cover plate assembly (20) comprising a cover plate body (21) and a collection area (22), the cover plate body (21) covers the containing cavity, and the collection area (22) is arranged on the side of the cover plate body (21) away from the shell (10); an insulation tape (30) comprising a first insulation part (31) covering the shell (10) and a second insulation part (32) surrounding the cover plate body (21); the second insulation part (32) comprises a first lug (321) and a second lug (322), the first lug (321) and the second lug (322) are arranged around the collection area (22), and one end of each of the first lug (321) and the second lug (322) is connected to the first insulation part (31), and the other end of the first lug (321) and the other end of the second lug (322) are overlapped with each other.

6. The unit cell of claim 5, wherein, ​ 7. The single-cell battery as described in claim 5, characterized in that, ​ 8. The cell of claim 1 wherein, ​ 9. A battery pack, characterized by, ​ 10. An electric device, characterized by The single cell according to any one of claims 1 to 8, or the battery pack according to claim 9.

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