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, the shell is provided with an accommodating cavity; the cover plate assembly covers the accommodating cavity and is connected with the shell; the insulating tape comprises a shell insulating part wrapping the shell and a cover plate insulating part wrapping the side, away from the shell, of the cover plate assembly, the shell insulating part is connected with the cover plate insulating part, and the cover plate insulating part comprises a first insulating part and a second insulating part; the first insulation parts are arranged on the two sides, extending in the length direction, of the cover plate assembly, the second insulation parts are arranged on the two sides, extending in the width direction, of the cover plate assembly, and the first insulation parts and the second insulation parts are partially overlapped. The utility model aims to solve the technical problem that the insulation rubber tape and the top cover patch are not tightly matched and are easy to warp at present.

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, insulation of individual cells is achieved using blue film insulating tape in conjunction with a top cover patch. To improve the overall energy density of the battery pack, the thickness of individual cells is becoming increasingly thinner, resulting in a smaller top cover size. Furthermore, with continuous optimization of the overall pack design, in addition to the conventional terminals, explosion-proof valves, and electrolyte filling holes, the cover plate has also added NTC temperature sensing areas and nickel plate welding voltage sensing areas. This has led to a very limited width of the blue film insulating tape folded onto the cover plate, resulting in a loose fit between the blue film insulating tape and the top cover patch, making it prone to lifting and poor insulation. In particular, the blue film insulating tape is folded over and then covered at the four corners of the top cover, resulting in multiple layers and causing the top cover patch to lift and detach. Utility Model Content

[0003] This application provides a single battery cell, aiming to overcome the technical problem that the fit between the insulating tape and the top cover patch is not tight and is prone to lifting; 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 assembly that covers the receiving cavity and is connected to the housing;

[0007] An insulating tape, comprising a housing insulating portion covering the housing and a cover insulating portion covering the side of the cover assembly opposite to the housing, wherein the housing insulating portion is connected to the cover insulating portion, and the cover insulating portion comprises a first insulating portion and a second insulating portion, wherein the first insulating portion is disposed on both sides of the cover assembly extending along its length direction, and the second insulating portion is disposed on both sides of the cover assembly extending along its width direction, wherein the first insulating portion and the second insulating portion partially overlap.

[0008] In some embodiments, the first insulating portion includes:

[0009] The first fitting portion covers one side of the cover plate assembly extending along its length;

[0010] The second bonding portion covers the other side of the cover plate assembly extending along its length, and the second bonding portion partially overlaps with the first bonding portion.

[0011] In some embodiments, the second insulating portion includes:

[0012] A third bonding portion covers one side of the cover plate assembly extending in its width direction, the third bonding portion covering part of the first bonding portion and part of the second bonding portion;

[0013] A fourth bonding portion covers the other side of the cover plate assembly extending in its width direction, the fourth bonding portion covering a portion of the first bonding portion and a portion of the second bonding portion.

[0014] In some embodiments, the cover plate assembly includes:

[0015] A cover plate body, which covers the cavity and connects to the housing, and the cover plate body has a first pole hole;

[0016] The electrode post is inserted through the first electrode post hole and connected to the electrode assembly in the receiving cavity;

[0017] The first insulating part has a first clearance groove, which extends through a portion of the first fitting part and a portion of the second fitting part along the thickness direction of the cover plate body, so as to allow the pole post to pass through.

[0018] In some embodiments, the cover plate assembly includes an explosion-proof valve, which is disposed on the cover plate body and connected to the cover plate body;

[0019] The first insulating part has a second clearance groove, which penetrates part of the first fitting part and part of the second fitting part along the thickness direction of the cover plate body, so as to allow the explosion-proof valve to pass through.

[0020] In some embodiments, the cover plate assembly includes a collection area disposed on the side of the cover plate body opposite to the housing;

[0021] The first insulating part has a third clearance groove, which penetrates part of the first fitting part and part of the second fitting part along the thickness direction of the cover plate body to expose the collection area.

[0022] In some embodiments, the overlap distance between the first bonding portion and the second bonding portion in the width direction of the cover plate assembly is A, which satisfies 4mm≤A≤7mm.

[0023] In some embodiments, the coverage distance L1mm of the first bonding portion in the width direction of the cover plate assembly, the coverage distance L2mm of the second bonding portion in the width direction of the cover plate assembly, the coverage distance L3mm of the third bonding portion in the length direction of the cover plate assembly, and the coverage distance L4mm of the fourth bonding portion in the length direction of the cover plate assembly satisfy L1=L2=L3=L4.

[0024] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0025] 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.

[0026] Several embodiments of this application have one of the following beneficial effects:

[0027] 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 seals the receiving cavity and is connected to the casing; the insulating tape includes a casing insulating portion covering the casing and a cover insulating portion covering the side of the cover assembly opposite to the casing. The casing insulating portion and the cover insulating portion are connected. The cover insulating portion includes a first insulating portion and a second insulating portion. The first insulating portion is disposed on both sides of the cover assembly extending along its length direction, and the second insulating portion is disposed on both sides of the cover assembly extending along its width direction. The first insulating portion and the second insulating portion partially overlap. This application aims to overcome the technical problem of poor fit and easy lifting between the insulating tape and the top cover patch in current applications.

[0028] 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.

[0029] 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

[0030] 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.

[0031] Figure 1A schematic diagram of the exploded structure of a prior art single-cell battery provided in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the overall structure of a single battery cell provided in an embodiment of this application;

[0033] Figure 3 Provided for the embodiments of this application Figure 2 Enlarged view of a portion of point A in the middle;

[0034] Figure 4 Provided for the embodiments of this application Figure 2 Enlarged view of a portion of point B in the middle;

[0035] Figure 5 The overall structure of a single cell with a data acquisition area provided in the embodiments of this application;

[0036] Figure label:

[0037] 1-Cover plate; 2-Outer shell; 3-Blue film insulating tape; 4-Cover plate top cover patch;

[0038] 10 - Shell;

[0039] 20-Cover plate assembly; 21-Cover plate body; 211-First pole hole; 22-Pole; 23-Explosion-proof valve; 24-Collection area;

[0040] 30 - Insulating tape; 31 - Housing insulation part; 32 - Cover plate insulation part; 321 - First insulation part; 3211 - First bonding part; 3212 - Second bonding part; 3213 - First clearance groove; 3214 - Second clearance groove; 3215 - Third clearance groove; 322 - Second insulation part; 3221 - Third bonding part; 3222 - Fourth bonding part. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Currently, insulation of individual cells is achieved using blue film insulating tape 3 in conjunction with the top cover patch 4. To improve the overall energy density of the battery pack, the thickness of individual cells is becoming thinner and thinner, resulting in a smaller top cover size. Furthermore, with the continuous optimization of the overall pack design, in addition to the conventional terminals, explosion-proof valves, and electrolyte injection holes, the top cover 1 has also added NTC temperature sensing areas and nickel sheet welding voltage sensing areas. This results in a very limited width for the blue film insulating tape 3 to be folded onto the top cover 1, leading to a problem of loose fit between the blue film insulating tape 3 and the top cover patch 4, which easily causes it to lift and result in poor insulation. In particular, the blue film insulating tape 3 is folded over and then covered at the four corners of the top cover, resulting in multiple layers and causing the top cover patch 4 to lift and fall off.

[0046] 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.

[0047] Please see Figure 2 , Figure 2 This is a schematic diagram of the overall structure 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 covers the receiving cavity and is connected to the housing 10; the insulating tape 30 includes a housing insulating portion 31 covering the housing 10 and a cover insulating portion 32 covering the side of the cover assembly 20 opposite to the housing 10. The housing insulating portion 31 and the cover insulating portion 32 are connected. The cover insulating portion 32 includes a first insulating portion 321 and a second insulating portion 322. The first insulating portion 321 is disposed on both sides of the cover assembly 20 extending along its length direction, and the second insulating portion 322 is disposed on both sides of the cover assembly 20 extending along its width direction. The first insulating portion 321 and the second insulating portion 322 partially overlap.

[0048] 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 reality, the housing insulation portion 31 completely covers the outer wall of the housing 10. An electrode assembly is disposed within the receiving cavity of the housing 10. The insulating tape 30 comprises a PET (polyester) film and pressure-sensitive adhesive, produced by coating the PET film with pressure-sensitive adhesive. The PET film is a polyester film with good insulating properties. The pressure-sensitive adhesive is a tacky adhesive used to fix the PET film to the cover assembly 20 and the housing 10. The housing insulation portion 31 is connected to the cover insulation portion 32; that is, the housing insulation portion 31 and the cover insulation portion 32 are an integral structure forming the insulating tape 30.

[0049] In view of this, this embodiment achieves good insulation of the entire single battery cell by setting the insulating tape 30, including the housing insulation part 31 and the cover plate insulation part 32. The insulating tape 30 is made of PET film and pressure-sensitive adhesive. The PET film has good insulation properties, while the pressure-sensitive adhesive can firmly fix the insulating tape 30 to the cover plate assembly 20 and the housing 10, ensuring reliable insulation effect. Compared with the traditional single battery cell structure, the insulating tape 30 in this embodiment can independently achieve insulation of the single battery cell without the need for additional cover plate top cover patch or other matching structures. This simplifies the battery structure, reduces the number of parts used, and improves production efficiency. The partial overlap of the first insulation part 321 and the second insulation part 322 creates a tensile effect, so that the insulating tape 30 completely covers the side of the cover plate assembly 20 away from the housing 10, thereby reducing the possibility of the insulating tape 30 lifting. This optimized design can improve the stability and reliability of the single battery cell.

[0050] In some embodiments, such as Figure 2 As shown, the first insulating portion 321 is further subdivided into a first bonding portion 3211 and a second bonding portion 3212. The first bonding portion 3211 covers one side of the cover assembly 20 extending along its length direction; the second bonding portion 3212 covers the other side of the cover assembly 20 extending along its length direction, and the second bonding portion 3212 partially overlaps with the first bonding portion 3211. It should be noted that this subdivided design further enhances the tightness of the insulating tape 30. By bonding the first bonding portion 3211 and the second bonding portion 3212 of the insulating tape 30 to both sides of the cover assembly 20 along its length direction, the side of the cover assembly 20 facing away from the housing 10 is covered by the insulating tape 30, thereby improving the insulation effect. Simultaneously, the partial overlap between the second bonding portion 3212 and the first bonding portion 3211 also creates a tensile effect, further increasing the fixation and stability of the insulating tape 30 and reducing the possibility of lifting.

[0051] In some embodiments, such as Figure 2As shown, the second insulating portion 322 is further subdivided into a third bonding portion 3221 and a fourth bonding portion 3222. The third bonding portion 3221 covers one side of the cover assembly 20 extending along its width direction, partially covering the first bonding portion 3211 and partially covering the second bonding portion 3212. The fourth bonding portion 3222 covers the other side of the cover assembly 20 extending along its width direction, partially covering the first bonding portion 3211 and partially covering the second bonding portion 3212. It should be noted that this subdivided design further enhances the tightness of the insulating tape 30. By attaching the third bonding portion 3221 and the fourth bonding portion 3222 of the insulating tape 30 to both sides of the cover assembly 20 in the width direction, and then attaching the first bonding portion 3211 and the second bonding portion 3212 to both sides of the cover assembly 20 in the length direction, it can be ensured that the entire side of the cover assembly 20 away from the housing 10 is completely covered by the insulating tape 30, thereby improving the insulation effect. At the same time, the third bonding portion 3221 and the fourth bonding portion 3222 covering part of the first bonding portion 3211 and part of the second bonding portion 3212 also form a tensile effect, further increasing the fixation and stability of the insulating tape 30.

[0052] In some embodiments, please refer to Figure 2 and Figure 3 , Figure 3 Provided for the embodiments of this application Figure 2 A partially enlarged schematic diagram at point A. The cover plate assembly 20 includes a cover plate body 21 and an electrode post 22. The cover plate body 21 seals the receiving cavity and connects to the housing 10. The cover plate body 21 has a first electrode post hole 211. The electrode post 22 passes through the first electrode post hole 211 and connects to the electrode group within the receiving cavity. The first insulating part 321 has a first clearance groove 3213. The first clearance groove 3213 extends along the thickness direction of the cover plate body 21, passing through a portion of the first fitting part 3211 and a portion of the second fitting part 3212, to allow the electrode post 22 to pass through. It should be noted that 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 receiving cavity with a certain mechanical strength to protect the electrode group.

[0053] In view of this, this embodiment can ensure a firm connection between the cover assembly 20 and the housing 10, and provides a sealed space to protect the electrode assembly from the influence of the external environment, ensuring the safety and reliability of the individual battery. At the same time, the presence of the first clearance groove 3213 allows the electrode post 22 to pass through the first insulating part 321 without damaging the integrity of the insulating tape 30, ensuring the continuity of the insulation effect.

[0054] In some embodiments, please refer to Figure 2 and Figure 4 , Figure 4 Provided for the embodiments of this application Figure 2 A partially enlarged schematic diagram at point B. The cover assembly 20 includes an explosion-proof valve 23, which is disposed on and connected to the cover body 21. The first insulating part 321 has a second clearance groove 3214, which penetrates part of the first fitting part 3211 and part of the second fitting part 3212 along the thickness direction of the cover body 21 to allow the explosion-proof valve 23 to pass through. It should be noted that the explosion-proof valve 23 is designed to release internal pressure when overpressure or overheating occurs inside the battery, thereby preventing the battery from exploding or being damaged. The explosion-proof valve 23 is typically made of a soluble or fusible material. When the internal pressure exceeds a set value, the explosion-proof valve 23 opens to release the pressure and protect the safety of the individual battery cells. The presence of the second clearance groove 3214 allows the explosion-proof valve 23 to pass through the first insulating part 321 without compromising the covering, fixing, and insulating effect of the insulating tape 30. This ensures the normal operation of the explosion-proof valve 23 while maintaining the insulation performance of the individual battery cells.

[0055] In some embodiments, please refer to Figure 2 and Figure 5 , Figure 5This application provides an embodiment of the overall structure of a single-cell battery with a collection area. The cover assembly 20 includes a collection area 24, which is disposed on the side of the cover body 21 facing away from the housing 10. The first insulating portion 321 has a third clearance groove 3215, which penetrates a portion of the first fitting portion 3211 and a portion of the second fitting portion 3212 along the thickness direction of the cover body 21 to expose the collection area 24. It should be noted that the collection area 24 can be used for different types of collection, such as an NTC temperature sensing collection area or a nickel sheet welding voltage collection area. When it is an NTC temperature sensing collection area: In some embodiments, the collection area 24 can be used to install an NTC (Negative Temperature Coefficient) temperature sensor. The NTC temperature sensing collection area is an area used to monitor the temperature of a single-cell battery. By installing an NTC temperature sensor in the collection area 24, the temperature change of the single-cell battery 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 collection area is an area used for welding voltage collection. In this configuration, the acquisition area 24 can be used to mount nickel plates connected to the positive and negative terminals of the individual cells. These nickel plates can be used to measure the voltage of the individual cells and transmit the voltage data to the battery management system for voltage monitoring and state estimation. The acquisition area 24 enables real-time monitoring and acquisition of parameters such as battery temperature or voltage. This data is crucial for the safety performance and state assessment of individual cells, helping the battery management system to perform precise control and protection to ensure the normal operation of the individual cells and extend their lifespan. The presence of the third clearance groove 3215 allows the acquisition area 24 to be exposed above the surface of the cover body 21 without compromising the covering, fixing, and insulation effect of the insulating tape 30. This ensures the normal operation of the acquisition area 24 while maintaining the insulation performance of the individual cells.

[0056] In some embodiments, such as Figure 5 As shown, the overlap distance A between the first bonding portion 3211 and the second bonding portion 3212 in the width direction of the cover assembly 20 satisfies 4mm ≤ A ≤ 7mm. It should be noted that this overlap distance range of A is to ensure the structural stability and sealing performance of the individual battery cells. If the overlap distance A is too small, the connection between the first bonding portion 3211 and the second bonding portion 3212 may lack sufficient strength, making it prone to lifting. Lifting may damage the sealing performance of the battery assembly, thereby affecting the safety and performance of the battery. Conversely, if the overlap distance A is too large, it may increase the size of the insulating tape 30, and also increase manufacturing costs.

[0057] Therefore, this embodiment limits the overlap spacing A to between 4mm and 7mm, selecting an appropriate overlap spacing A to balance the relationship between structural stability, insulation performance, and manufacturing cost. The specific value selection should be based on a comprehensive consideration of factors such as the size of the individual cell, material properties, and manufacturing process.

[0058] In some embodiments, such as Figure 5 As shown, the coverage distances of the first bonding portion 3211 in the width direction of the cover assembly 20 are L1mm, the second bonding portion 3212 in the width direction of the cover assembly 20 are L2mm, the third bonding portion 3221 in the length direction of the cover assembly 20 is L3mm, and the fourth bonding portion 3222 in the length direction of the cover assembly 20 are L4mm, satisfying L1=L2=L3=L4. It should be noted that this design choice ensures that the coverage distances of the first bonding portion 3211, the second bonding portion 3212, the third bonding portion 3221, and the fourth bonding portion 3222 in the length direction of the cover assembly 20 are the same, which simplifies the manufacturing process and improves manufacturing convenience and efficiency. Maintaining the same coverage distance reduces adjustments and calibrations during manufacturing, lowers manufacturing costs, and helps ensure the consistency and stability of the insulating tape 30. Maintaining the same coverage distance ensures uniform and balanced connections between the bonding portions, reducing stress concentration and uneven load problems caused by differences in coverage distance.

[0059] In some embodiments, such as Figure 5 As shown, the distance between the opening of the first clearance groove 3213 and the side wall of the terminal 22 is W1, satisfying 0.3mm ≤ W1 ≤ 0.5mm. It should be noted that this distance range of W1 is chosen to ensure sufficient clearance between the first clearance groove 3213 and the terminal 22 to avoid direct contact or overly tight fit. An appropriate distance provides sufficient space to prevent short circuits or damage to the individual battery cells due to thermal expansion and contraction or mechanical stress during use. If the distance W1 is too small, it may lead to contact or fit between the first clearance groove 3213 and the terminal 22, increasing the risk of short circuits. Furthermore, an excessively small distance may also cause difficulties in the manufacturing and assembly of the individual battery cells. However, if the distance W1 is too large, the coverage area of ​​the insulating tape 30 may be too small, affecting the performance and safety of the battery. Therefore, a suitable distance W1 needs to be selected within the range of 0.3mm to 0.5mm in the design to balance the performance, safety, and manufacturing cost of the individual battery cells.

[0060] In some embodiments, such as Figure 5As shown, the distance W2 between the opening of the second clearance groove 3214 and the side wall of the explosion-proof valve 23 satisfies 0.3mm ≤ W2 ≤ 0.5mm. It should be noted that this distance range of W2 is chosen to ensure sufficient clearance between the second clearance groove 3214 and the explosion-proof valve 23 to avoid direct contact or overly tight fit between them. An appropriate distance provides sufficient space to prevent short circuits or damage to the individual battery cells due to thermal expansion and contraction or mechanical stress during use. If the distance W2 is too small, it may lead to contact or fit between the second clearance groove 3214 and the explosion-proof valve 23, increasing the risk of short circuits. Furthermore, an excessively small distance may also cause difficulties in the manufacturing and assembly of the insulating tape 30. However, if the distance W2 is too large, the coverage area of ​​the insulating tape 30 may be too small, affecting battery performance and safety. Therefore, in the design, a suitable distance W2 needs to be selected within the range of 0.3mm to 0.5mm to balance the relationship between the performance, safety, and manufacturing cost of the individual battery cells.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 utility model relates to a shell (10) has the accommodation cavity, the cover plate subassembly (20) is sealed to the accommodation cavity with the shell (10) is connected, the insulating adhesive tape (30) includes the shell insulating part (31) of covering the shell (10) and the cover plate insulating part (32) of covering the cover plate subassembly (20) one side away from the shell (10), the shell insulating part (31) is connected with the cover plate insulating part (32), the cover plate insulating part (32) includes first insulating part (321) and second insulating part (322), first insulating part (321) is set up in the cover plate subassembly (20) along its length direction extends two sides, second insulating part (322) is set up in the cover plate subassembly (20) along its width direction extends two sides, first insulating part (321) with second insulating part (322) partially overlaps. The first insulating part (321) includes: First fitment (3211) is covered in the cover plate subassembly (20) along its length direction extends one side; Second fitment (3212) is covered in the cover plate subassembly (20) along its length direction extends the other side, and the second fitment (3212) partially overlaps with the first fitment (3211).

2. The unit cell of claim 1, wherein, The second insulating part (322) includes: Third fitment (3221) is covered in the cover plate subassembly (20) along its width direction extends one side, and the third fitment (3221) covers part of the first fitment (3211) and part of the second fitment (3212); Fourth fitment (3222) is covered in the cover plate subassembly (20) along its width direction extends the other side, and the fourth fitment (3222) covers part of the first fitment (3211) and part of the second fitment (3212).

3. The unit cell of claim 2, wherein, The cover plate subassembly (20) includes: Cover plate body (21) is sealed to the accommodation cavity with the shell (10) is connected, and the cover plate body (21) has first pole hole (211); Pole (22) is arranged in the first pole hole (211) and is connected with the pole group in the accommodation cavity; 4. The unit cell according to claim 2 or 3, wherein The first insulating part (321) has first avoiding slot (3213), and the first avoiding slot (3213) penetrates part of the first fitment (3211) and part of the second fitment (3212) along the thickness direction of the cover plate body (21) to be arranged for the pole (22). The cover plate subassembly (20) includes explosion-proof valve (23), and the explosion-proof valve (23) is arranged on the cover plate body (21) and is connected with the cover plate body (21); The first insulating part (321) has second avoiding slot (3214), and the second avoiding slot (3214) penetrates part of the first fitment (3211) and part of the second fitment (3212) along the thickness direction of the cover plate body (21) to be arranged for the explosion-proof valve (23). ​ 5. The unit cell of claim 4, wherein, ​ ​ 6. The single-cell battery as described in claim 4, characterized in that, The cover plate assembly (20) comprises a collection area (24) arranged on a side of the cover plate body (21) away from the shell (10); The first insulation part (321) has a third avoiding groove (3215) penetrating part of the first bonding part (3211) and part of the second bonding part (3212) along the thickness direction of the cover plate body (21) to expose the collection area (24).

7. The single-cell battery as described in claim 2, characterized in that, The overlapping distance of the first bonding part (3211) and the second bonding part (3212) in the width direction of the cover plate assembly (20) is A, satisfying 4mm≤A≤7mm.

8. The unit cell of claim 3, wherein, The covering distance of the first bonding part (3211) in the width direction of the cover plate assembly (20) is L1mm, the covering distance of the second bonding part (3212) in the width direction of the cover plate assembly (20) is L2mm, the covering distance of the third bonding part (3221) in the length direction of the cover plate assembly (20) is L3mm, and the covering distance of the fourth bonding part (3222) in the length direction of the cover plate assembly (20) is L4mm, satisfying L1=L2=L3=L4.

9. A battery pack, characterized by, A single battery comprising any one of the above claims 1 to 8.

10. An electric device, characterized by A battery pack comprising any one of the above claims 1 to 8 or the above claim 9.

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