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 comprises a cover plate body, the cover plate body covers the containing cavity and is connected with the shell, the cover plate body is provided with an anti-explosion hole, and the anti-explosion hole is communicated with the containing cavity; the insulating tape comprises a shell insulating part and a cover plate insulating part, the shell insulating part is connected with the cover plate insulating part, the shell insulating part wraps the shell, and the cover plate insulating part wraps the side, away from the shell, of the cover plate body so as to cover and seal the explosion-proof hole. The anti-explosion valve aims at solving the technical problem that a battery has potential safety hazards due to the fact that an existing anti-explosion valve patch is prone to falling off.

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] In the cell manufacturing process, there are processes such as cell electrolyte injection, high-temperature baking, and welding of the cover plate and the periphery of the casing. The explosion-proof valve patch is easily affected by electrolyte contamination and temperature, which reduces the adhesion between the explosion-proof valve patch and the cover plate. In subsequent module stacking, PACK module manufacturing process and even battery pack use, the explosion-proof valve patch is likely to fall off, which reduces the safety performance of the cell and poses a hidden danger to battery safety. Utility Model Content

[0003] This application provides a single battery cell, aiming to overcome the technical problem that the explosion-proof valve patch is easy to fall off, causing safety hazards to the battery; 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, the cover plate assembly including a cover plate body, the cover plate body sealing the receiving cavity and connected to the housing, the cover plate body having an explosion-proof hole communicating with the receiving cavity;

[0007] An insulating tape comprising a housing insulating portion and a cover insulating portion, wherein the housing insulating portion is connected to the cover insulating portion, the housing insulating portion covers the housing, and the cover insulating portion covers the side of the cover body opposite to the housing and seals the explosion-proof hole.

[0008] In some embodiments, the cover plate insulation portion includes a first insulation portion and a second insulation portion. The first insulation portion is disposed on both sides of the cover plate body extending along its length direction and covers the explosion-proof hole. The second insulation portion is disposed on both sides of the cover plate body extending along its width direction, and the first insulation portion and the second insulation portion overlap.

[0009] In some embodiments, the first insulating portion includes:

[0010] The first fitting portion covers one side of the cover plate body extending along its length;

[0011] The second fitting portion covers the other side of the cover plate body extending along its length, and the second fitting portion partially overlaps with the first fitting portion, thus sealing the explosion-proof hole.

[0012] In some embodiments, the second insulating portion includes:

[0013] The third bonding portion covers one side of the cover plate body extending in its width direction, and the third bonding portion covers part of the first bonding portion and part of the second bonding portion;

[0014] A fourth bonding portion covers the other side of the cover plate body extending along its width direction, the fourth bonding portion covering part of the first bonding portion and part of the second bonding portion.

[0015] In some embodiments, the cover plate assembly includes a pole that penetrates the cover plate body;

[0016] 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.

[0017] In some embodiments, the cover plate assembly includes a collection area disposed on the side of the cover plate body opposite to the housing;

[0018] 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 to expose the collection area.

[0019] In some embodiments, the overlap distance between the first fitting portion and the second fitting portion in the width direction of the cover plate body is A, which satisfies 3mm≤A≤5mm.

[0020] In some embodiments, the coverage distance L1mm of the first bonding part in the width direction of the cover plate body, the coverage distance L2mm of the second bonding part in the width direction of the cover plate body, the coverage distance L3mm of the third bonding part in the length direction of the cover plate body, and the coverage distance L4mm of the fourth bonding part in the length direction of the cover plate body satisfy L1=L2=L3=L4.

[0021] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0022] 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.

[0023] Several embodiments of this application have one of the following beneficial effects:

[0024] 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 that covers the receiving cavity and is connected to the casing. The cover body has an explosion-proof hole that communicates with the receiving cavity. The insulating tape includes a casing insulating portion and a cover insulating portion. The casing insulating portion is connected to the cover insulating portion. The casing insulating portion covers the casing, and the cover insulating portion covers the side of the cover body away from the casing to cover the explosion-proof hole. By replacing the existing explosion-proof valve patch with the cover insulating portion, the cover insulating portion satisfies the basic function of the explosion-proof valve patch while avoiding the problem that the explosion-proof valve patch is easily contaminated by electrolyte and affected by temperature, which reduces the adhesion between the explosion-proof valve patch and the cover, causing the explosion-proof valve patch to fall off and resulting in a safety hazard to the battery.

[0025] 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.

[0026] 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

[0027] 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.

[0028] Figure 1 A schematic diagram of the exploded structure of a prior art single-cell battery provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the overall structure of a single battery cell provided in an embodiment of this application;

[0030] Figure 3 Provided for the embodiments of this application Figure 2 Enlarged view of a portion of point A in the middle;

[0031] Figure 4 Provided for the embodiments of this application Figure 2 Enlarged view of a portion of point B in the middle;

[0032] Figure 5 Schematic diagrams of various spacings provided for embodiments of this application;

[0033] Figure label:

[0034] 1-Cover plate; 2-Outer shell; 3-Blue film insulating tape; 4-Top cover patch; 5-Explosion-proof valve patch;

[0035] 10-Shell;

[0036] 20-Cover plate assembly; 21-Cover plate body; 22-Explosion-proof hole; 23-Pole post; 24-Collection area;

[0037] 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; 322 - Second insulation part; 3221 - Third bonding part; 3222 - Fourth bonding part. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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 in the prior art provided in this application embodiment. A single battery typically includes: a casing 2, electrode assembly, a cover plate 1, blue insulating tape 3, a top cover patch 4, and an explosion-proof valve patch 5, 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. The explosion-proof valve patch 5 is used to release pressure when the internal pressure of the single battery is too high to prevent the single battery from exploding. It should be noted that this diagram is for better illustration of the structure of the single battery. Figure 1 Only a portion of the inner shell 2 is shown.

[0042] Currently, the battery cell manufacturing process involves processes such as electrolyte injection, high-temperature baking, and welding of the cover plate 1 and the outer shell 2. The explosion-proof valve patch 5 is easily affected by electrolyte contamination and temperature, which reduces the adhesion between the explosion-proof valve patch 5 and the cover plate 1. In subsequent module stacking, PACK module manufacturing process, and even battery pack use, the explosion-proof valve patch 5 is likely to fall off, reducing the safety performance of the battery cell and posing a safety hazard to the battery.

[0043] 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.

[0044] 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 includes a cover body 21, which covers the receiving cavity and is connected to the housing 10. The cover body 21 has an explosion-proof hole 22 that communicates with the receiving cavity; the insulating tape 30 includes a housing insulating portion 31 and a cover insulating portion 32, which are connected. The housing insulating portion 31 covers the housing 10, and the cover insulating portion 32 covers the side of the cover body 21 facing away from the housing 10 and seals the explosion-proof hole 22.

[0045] It should be noted that, in order to better illustrate the structure of a single battery cell, Figure 2Only 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 housed within the receiving cavity 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 receiving cavity with a certain mechanical strength to protect the electrode assembly. The insulating tape 30 includes 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 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. The housing insulation portion 31 and the cover plate insulation portion 32 are connected, meaning the housing insulation portion 31 and the cover plate insulation portion 32 are an integrated structure forming the insulating tape 30.

[0046] In view of this, this embodiment ensures a firm connection between the cover plate body 21 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. This embodiment achieves good insulation of the entire individual battery through the use of 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 body 21 and the housing 10, ensuring reliable insulation. Compared with traditional individual battery structures, the insulating tape 30 in this embodiment can independently achieve insulation of the individual battery without the need for additional top cover patch 4 or other matching structures. This simplifies the battery structure, reduces the number of components used, and improves production efficiency. The insulating portion 32 of the cover plate covers the side of the cover plate body 21 facing away from the housing 10, sealing the explosion-proof hole 22. The insulating portion 32 replaces the existing explosion-proof valve patch. While fulfilling the basic functions of the explosion-proof valve patch, the insulating portion 32 avoids the problem of reduced adhesion between the explosion-proof valve patch and the cover plate due to electrolyte contamination and temperature fluctuations, which could lead to the patch detaching and posing a safety hazard to the battery. This improves the battery's safety performance.

[0047] In some embodiments, such as Figure 2As shown, the cover plate insulation portion 32 is further subdivided into a first insulation portion 321 and a second insulation portion to improve the insulation effect. The first insulation portion 321 extends along the length direction of the cover plate body 21 and is located on both sides thereon. Simultaneously, the first insulation portion 321 also covers and seals the explosion-proof hole 22. The second insulation portion extends along the width direction of the cover plate body 21 and is located on both sides thereon. The first insulation portion 321 and the second insulation portion overlap. It should be noted that by subdividing the cover plate insulation portion 32 into the first insulation portion 321 and the second insulation portion, the insulation performance of the single cell can be further enhanced. The first insulation portion 321, located on both sides of the cover plate body 21, effectively blocks the contact between the external environment and the inside of the cell, providing additional insulation protection. Simultaneously, the first insulation portion 321 also covers and seals the explosion-proof hole 22, ensuring the insulation performance of the explosion-proof hole 22. The second insulation portion, located on both sides of the cover plate body 21, further increases the coverage area of ​​the insulating tape 30, providing a more reliable insulation effect. The overlapping portion of the first insulating part 321 and the second insulating part creates a tensile effect, ensuring that the insulating tape 30 completely covers the side of the cover plate body 21 away from the housing 10, thereby reducing the possibility of the insulating tape 30 peeling off. This optimized design can improve the stability and reliability of the individual battery cells.

[0048] 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 plate body 21 extending along its length; the second bonding portion 3212 covers the other side of the cover plate body 21 extending along its length, and the second bonding portion 3212 partially overlaps with the first bonding portion 3211, sealing the explosion-proof hole 22. 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 plate assembly 20 along its length, the side of the cover plate body 21 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 warping. Furthermore, the first bonding part 3211 and the second bonding part 3212 also cover and seal the explosion-proof hole 22, ensuring the insulation performance of the explosion-proof hole 22.

[0049] In some embodiments, such as Figure 2As shown, the second insulating portion 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 plate body 21 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 plate body 21 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 and fourth adhesive portions 3221 and 3222 of the insulating tape 30 to both sides of the cover body 21 in the width direction, and then attaching the first and second adhesive portions 3211 and 3212 to both sides of the cover body 21 in the length direction, it can be ensured that the entire cover body 21 on the side facing away from the housing 10 is completely covered by the insulating tape 30, thereby improving the insulation effect. At the same time, the third and fourth adhesive portions 3221 and 3222 covering the portion of the first adhesive portion 3211 and the portion of the second adhesive portion 3212 also form a tensile effect, further increasing the fixation and stability of the insulating tape 30.

[0050] 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 pole post 23, which penetrates the cover plate body 21 and connects to the pole group within the receiving cavity. The first insulating portion 321 has a first clearance groove 3213, which extends along the thickness direction of the cover plate body 21, passing through a portion of the first fitting portion 3211 and a portion of the second fitting portion 3212, to allow the pole post 23 to pass through. It should be noted that the presence of the first clearance groove 3213 allows the pole post 23 to pass through the first insulating portion 321 without damaging the integrity of the insulating tape 30, ensuring the continuity of the insulation effect.

[0051] In some embodiments, please refer to Figure 2 and Figure 4 , Figure 4 Provided for the embodiments of this application Figure 2A partially enlarged schematic diagram at point B. The cover plate assembly 20 includes a collection area 24, which is located on the side of the cover plate body 21 opposite to the housing 10. The first insulating portion 321 has a second clearance groove 3214, 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 plate 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. By installing an NTC temperature sensor in the collection area 24, 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 collection area is an area for welding voltage collection. In this case, the collection area 24 can be used to install nickel sheets connected to the positive and negative electrodes of the single cell. These nickel strips can be used to measure the voltage of individual cells and transmit the voltage data to the battery management system for voltage monitoring and state estimation. Real-time monitoring and acquisition of parameters such as battery temperature or voltage can be achieved through the acquisition area 24. 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 individual cells and extend their lifespan. The presence of the second clearance groove 3214 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.

[0052] In some embodiments, please refer to Figure 5 , Figure 5 This is a schematic diagram of the various spacings provided in the embodiments of this application. The overlap spacing A between the first bonding portion 3211 and the second bonding portion 3212 in the width direction of the cover body 21 satisfies 3mm ≤ A ≤ 5mm. It should be noted that the range of this overlap spacing A is to ensure the structural stability and sealing performance of the individual battery cells. If the overlap spacing A is too small, the connection between the first bonding portion 3211 and the second bonding portion 3212 may be insufficient, making it prone to lifting. Lifting may damage the sealing performance of the battery assembly, thereby affecting the safety and performance of the battery. On the other hand, if the overlap spacing A is too large, it may increase the size of the insulating tape 30, and also increase the manufacturing cost.

[0053] 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.

[0054] In some embodiments, such as Figure 5 As shown, the first bonding portion 3211 has a coverage distance of L1mm in the width direction of the cover plate body 21, the second bonding portion 3212 has a coverage distance of L2mm in the width direction of the cover plate assembly 20, the third bonding portion 3221 has a coverage distance of L3mm in the length direction of the cover plate assembly 20, and the fourth bonding portion 3222 has a coverage distance of L4mm in the length direction of the cover plate assembly 20, 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 are the same in the length direction of the cover plate body 21, which simplifies the manufacturing process and improves manufacturing convenience and efficiency. By maintaining the same coverage distance, adjustments and calibrations during the manufacturing process can be reduced, manufacturing costs can be lowered, and the consistency and stability of the insulating tape 30 can be ensured. Maintaining the same coverage distance ensures uniform and balanced connection between the various bonding portions, reducing stress concentration and uneven load problems caused by differences in coverage distance.

[0055] 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 post 23 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 post 23 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 post 23, increasing the risk of short circuits. Furthermore, an excessively small distance may also cause difficulties in the manufacturing and assembly process of the individual battery cells. However, if the distance W1 is too large, it may result in insufficient coverage of the insulating tape 30, 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.

[0056] In some embodiments, such as Figure 5As shown, the distance W2 between the opening of the second clearance groove 3214 and the sidewall of the collection area 24 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 collection area 24 to avoid direct contact or overly tight adhesion between them. An appropriate distance provides sufficient space to prevent short circuits or damage to the individual 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 adhesion between the second clearance groove 3214 and the collection area 24, 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 the performance and safety of the battery. Therefore, in the design, a suitable distance W2 needs to be selected within the range of 0.3mm to 0.5mm to balance the performance, safety, and manufacturing cost of the individual cells.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 battery, characterized in that, include: A housing (10) having a receiving cavity; A cover plate assembly (20) includes a cover plate body (21), which covers the receiving cavity and is connected to the housing (10). The cover plate body (21) has an explosion-proof hole (22) that communicates with the receiving cavity. Insulating tape (30) includes a housing insulating part (31) and a cover insulating part (32). The housing insulating part (31) is connected to the cover insulating part (32). The housing insulating part (31) covers the housing (10). The cover insulating part (32) covers the side of the cover body (21) away from the housing (10) and seals the explosion-proof hole (22).

2. The single-cell battery as described in claim 1, characterized in that, The cover plate insulation portion (32) includes a first insulation portion (321) and a second insulation portion (322). The first insulation portion (321) is disposed on both sides of the cover plate body (21) extending along its length direction, and the first insulation portion (321) covers the explosion-proof hole (22). The second insulation portion (322) is disposed on both sides of the cover plate body (21) extending along its width direction, and the first insulation portion (321) and the second insulation portion (322) overlap.

3. The single-cell battery as described in claim 2, characterized in that, The first insulating portion (321) includes: The first fitting part (3211) covers one side of the cover plate body (21) extending along its length direction; The second fitting part (3212) covers the other side of the cover plate body (21) extending along its length direction, and the second fitting part (3212) partially overlaps with the first fitting part (3211) and seals the explosion-proof hole (22).

4. The single-cell battery as described in claim 3, characterized in that, The second insulating part (322) includes: The third fitting portion (3221) covers one side of the cover plate body (21) extending in its width direction, and the third fitting portion (3221) covers part of the first fitting portion (3211) and part of the second fitting portion (3212); The fourth fitting portion (3222) covers the other side of the cover plate body (21) extending in its width direction, and the fourth fitting portion (3222) covers part of the first fitting portion (3211) and part of the second fitting portion (3212).

5. The single-cell battery as described in claim 3 or 4, characterized in that, The cover plate assembly (20) includes a pole post (23) that penetrates the cover plate body (21); The first insulating part (321) has a first clearance groove (3213), which penetrates part of the first fitting part (3211) and part of the second fitting part (3212) along the thickness direction of the cover plate body (21) so that the pole post (23) can pass through.

6. The single-cell battery as described in claim 3 or 4, characterized in that, The cover plate assembly (20) includes a collection area (24), which is located on the side of the cover plate body (21) away from the housing (10); 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 plate body (21) to expose the collection area (24).

7. The single-cell battery as described in claim 3, characterized in that, The overlap distance between the first fitting part (3211) and the second fitting part (3212) in the width direction of the cover plate body (21) is A, which satisfies 3mm≤A≤5mm.

8. The single-cell battery as described in claim 4, characterized in that, The first fitting part (3211) covers the cover plate body (21) at a distance of L1 mm in the width direction, the second fitting part (3212) covers the cover plate body (21) at a distance of L2 mm in the width direction, the third fitting part (3221) covers the cover plate body (21) at a distance of L3 mm in the length direction, and the fourth fitting part (3222) covers the cover plate body (21) at a distance of L4 mm in the length direction, satisfying L1 = L2 = L3 = L4.

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

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

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