Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of power batteries, the single battery comprises a shell, an electrode assembly, an insulating film, a side plate and a cover plate assembly, and the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity and has a first direction; the insulating film sleeves the periphery of the electrode assembly by one circle and is partially overlapped and connected, and the insulating film is positioned between the electrode assembly and the shell; the side plate is arranged at the overlapped and connected part of the insulating film along the first direction, and the side plate and the insulating film are integrally formed; the cover plate assemblies are arranged at the two ends of the shell, cover the containing cavity and are connected with the shell. The side plate and the insulating film are integrally formed, so that the step of assembling the side plate and the insulating film is reduced. Through partial overlapping of the insulating film, after the periphery of the electrode assembly is coated with the insulating film, an adhesive tape does not need to be used for fixing, and the step of coating the insulating film is further reduced.

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, in lithium-ion battery production, blade cells require tape to be applied to the sides to gather the insulating film. For long blade cells, the overlapping area on the sides is gathered solely by tape, leaving the insulating film unsupported by the tape and prone to unevenness. This unevenness in the overlapping area can significantly affect the cell's insertion into the casing. Furthermore, redundant protrusions on the side of the insulating film can easily snag on the casing opening, hindering insertion and potentially damaging the insulating film. Additionally, the side plates of blade cells need to be heat-fused to the insulating film, which can easily lead to protrusions and abnormal heat-fusion penetration. Utility Model Content

[0003] This application provides a single battery cell, aiming to overcome the technical problem of the complicated process of wrapping the insulating film in current applications; 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] The shell has a receiving cavity;

[0006] An electrode assembly is disposed within a receiving cavity, and the electrode assembly has a first orientation;

[0007] An insulating film is fitted around the outer circumference of the electrode assembly and partially overlapped and connected, with the insulating film located between the electrode assembly and the housing;

[0008] The side plate is disposed along the first direction at the portion where the insulating film overlaps and connects, and the side plate and the insulating film are integrally formed.

[0009] The cover plate assembly is located at both ends of the housing and covers the connection between the receiving cavity and the housing.

[0010] In some embodiments,

[0011] The insulating film includes a first overlapping region, a first film body, a second film body, a third film body, a second overlapping region, and a first adhesive layer disposed on the second overlapping region, which are connected in sequence.

[0012] The first overlapping area has a first surface and a second surface that are disposed opposite to each other, the side plate is attached to the first surface, and the second surface is in contact with the electrode assembly;

[0013] The first membrane body, the second membrane body, and the third membrane body are all attached to the electrode assembly;

[0014] The second overlapping area has a third surface on which the first adhesive layer is attached, and the first adhesive layer is bonded to the side of the side plate opposite to the first surface.

[0015] In some embodiments, the side panel has a first panel and a second panel disposed opposite to each other, a second adhesive layer is disposed on the side of the first panel facing the first panel, the second adhesive layer is adhered to the first panel, and the second panel is adhered to the first adhesive layer.

[0016] In some embodiments, the insulating film has two first positioning holes extending through its thickness direction, the first positioning holes being located in the first overlapping region.

[0017] In some embodiments, the side plate further includes two positioning posts, which are disposed on the first plate surface and pass through the first positioning hole.

[0018] In some embodiments, in the first direction, the minimum distance between one of the first positioning holes and the edge of the first overlapping area is L1mm, satisfying 53mm≤L1≤63mm; the minimum distance between the other first positioning hole and the edge of the first overlapping area is L2mm, satisfying 53mm≤L2≤63mm.

[0019] In some embodiments, the insulating film has two second positioning holes extending through its thickness direction, the second positioning holes being located in the second overlapping region.

[0020] In some embodiments, in the first direction, the minimum distance between one of the second positioning holes and the edge of the first overlapping area is L3mm, satisfying 33mm≤L3≤43mm; the minimum distance between the other second positioning hole and the edge of the first overlapping area is L4mm, satisfying 33mm≤L4≤43mm.

[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, an electrode assembly, an insulating film, a side plate, and a cover plate assembly. The casing has a receiving cavity; the electrode assembly is disposed within the receiving cavity; the insulating film is sleeved around the outer circumference of the electrode assembly and partially overlaps with it, with the insulating film located between the electrode assembly and the casing; the side plate is disposed along a first direction at the overlapping portion of the insulating film, and the side plate and the insulating film are integrally formed. The cover plate assembly is disposed at both ends of the casing and seals the receiving cavity and connects to the casing. This application integrates the side plate and the insulating film, so that when covering the insulating film, only the side plate and the insulating film need to be pre-formed during manufacturing, and the integrally formed structure can directly cover the electrode assembly, simplifying the steps of separately manufacturing the side plate and the insulating film. Through the partial overlap of the insulating film, after covering the outer circumference of the electrode assembly with the insulating film, there is no need to use tape for fixation, further reducing the steps of covering the insulating film.

[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 This is a schematic diagram of the internal structure of a single battery cell provided in an embodiment of this application;

[0029] Figure 2 This is a simplified schematic diagram showing the positional relationship between the electrode assembly and the insulating component provided in an embodiment of this application;

[0030] Figure 3 A schematic diagram of one side of the integrated molding structure of the side plate and insulating film provided in the embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the other side of the integrated side plate and insulating film structure provided in the embodiments of this application;

[0032] Figure 5 This is a structural schematic diagram of one side of the side plate provided in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of the structure of the other side of the side plate provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] X - First direction;

[0036] 10-Shell; 11-Receiving cavity;

[0037] 20-Electrode assembly;

[0038] 30 - Insulating film; 31 - First overlapping area; 311 - First surface; 312 - Second surface; 32 - First film body; 33 - Second film body; 34 - Third film body; 35 - Second overlapping area; 351 - Third surface; 36 - First adhesive layer; 37 - First positioning hole; 38 - Second positioning hole;

[0039] 40-Side panel; 41-First panel surface; 42-Second adhesive layer; 43-Positioning post; 44-Second panel surface;

[0040] 50 - Cover plate assembly. 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] In the accompanying drawings of the embodiments of this application, the first direction X is indicated by an arrow marked X. The description of this application introduces the first direction X to more clearly illustrate the structure and relative positional relationship of the single cell. In practical applications, the first direction X can point to any direction in space. For ease of understanding, this application uses the first direction X as the length direction of the single cell as an example for explanation.

[0045] As a preamble to the embodiments of this application, in lithium-ion battery production, blade cells wrapped with Mylar film require side tape for gathering. However, the overlapping gathering area of ​​long blade cells relies solely on tape, leaving the Mylar film unsupported by the tape, making it prone to unevenness and waviness. Severe unevenness in this overlapping area can affect cell insertion into the casing, easily causing redundant protrusions on the Mylar film side tape to snag on the casing opening, hindering insertion and potentially damaging the Mylar film. Furthermore, the side plates of blade cells need to be heat-fused to the Mylar film, which can easily lead to protrusions and abnormal heat-fusion penetration. Additionally, the rapid production speed of blade cells makes full CT inspection impossible, hindering timely identification of cell defects caused by damaged Mylar film during casing insertion. This can easily lead to casing corrosion after vehicle assembly, posing a significant safety hazard.

[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 1 and Figure 2 (To better illustrate the relationship between electrode assembly 20 and insulating film 30) Figure 2 (Only a portion of the insulating film 30 is shown in the image). An embodiment of this application provides a single-cell battery comprising a housing 10, an electrode assembly 20, an insulating film 30, a side plate 40, and a cover plate assembly 50. The housing 10 has a receiving cavity; the electrode assembly 20 is disposed within the receiving cavity; the insulating film 30 is sleeved around the outer circumference of the electrode assembly 20 and partially overlaps it, with the insulating film 30 located between the electrode assembly 20 and the housing 10; the side plate 40 is disposed along the first direction X at the overlapping portion of the insulating film 30, and the side plate 40 and the insulating film 30 are integrally formed. The cover plate assembly 50 is disposed at both ends of the housing 10 and covers the receiving cavity, connecting it to the housing 10.

[0048] It should be noted that the single cell in this embodiment is a blade cell, which is designed in a long and thin blade shape. This design maximizes the use of space between the single cells, improving the energy density and power density of the battery pack. Regarding the electrode assembly 20, it includes positive and negative electrode materials and an electrolyte, used to generate current and store electrical energy. The side plate 40 and the insulating film 30 are integrally formed, which can be achieved through a high-temperature, high-pressure thermal bonding process. This integral structure enhances the bonding strength between the side plate 40 and the insulating film 30, improving overall stability and durability. Regarding the cover assembly 50, it can be fixedly connected to the housing 10 by welding. After welding, the cover assembly 50 and the housing 10 form a sealed space containing the electrode assembly 20 with a certain mechanical strength.

[0049] In view of this, compared to the traditional method of first preparing the Mylar film (polyester film) and side plate 40, then thermally bonding the Mylar film and side plate 40 together, then covering the outer periphery of the electrode assembly 20, and finally fixing it with tape, this embodiment integrates the side plate 40 and the insulating film 30 into one piece. This means that when covering the insulating film 30, it is only necessary to pre-form the side plate 40 and the insulating film 30 into one piece during manufacturing. The integrated structure can directly cover the electrode assembly 20, simplifying the steps of separately manufacturing the side plate 40 and the insulating film 30. Through the partial overlap of the insulating film 30, after covering the outer periphery of the electrode assembly 20 with the insulating film 30, there is no need to use tape for fixing, further reducing the steps of covering the insulating film 30. Furthermore, this embodiment can avoid abnormal protrusions and melt-through during the hot-melt welding process of the side plate 40 during assembly, and reduce the abnormal unevenness of the overlapping area of ​​the insulating film 30. It can also prevent scratches caused by poor folding of the insulating film 30 on the side when it is inserted into the casing, thereby preventing the insulating film 30 from damaging the battery and causing abnormal corrosion during long-term cycling, which greatly reduces the safety risk factor of the battery cell.

[0050] In some embodiments, please refer to Figure 3 and Figure 4 The insulating film 30 includes a first overlapping region 31, a first film body 32, a second film body 33, a third film body 34, a second overlapping region 35 connected in sequence, and a first adhesive layer 36 disposed on the second overlapping region 35. The first overlapping region 31 has a first surface 311 and a second surface 312 disposed opposite to each other. The side plate 40 is attached to the first surface 311, and the second surface 312 is bonded to the electrode assembly 20. The first film body 32, the second film body 33, and the third film body 34 are all bonded to the electrode assembly 20. The second overlapping region 35 has a third surface 351, on which the first adhesive layer 36 is attached. The first adhesive layer 36 is bonded to the side of the side plate 40 opposite to the first surface 311.

[0051] It should be noted that the first surface 311 and the second surface 312 refer to the two sides of the first overlapping area 31 in its thickness direction. The side plate 40 is firmly attached to the first surface 311 through processes such as high-temperature and high-pressure thermal bonding, thereby achieving the integrated molding of the side plate 40 and the insulating film 30; the second surface 312 is tightly attached to the electrode assembly 20, providing insulation protection for the electrode assembly 20. The first film body 32, the second film body 33, and the third film body 34 are all attached to the outer surface of the electrode assembly 20 during the process of surrounding the electrode assembly 20. This not only provides all-round insulation protection for the electrode assembly 20, but also provides physical support for the electrode assembly 20 to a certain extent, maintaining its structural stability. The third surface 351 refers to one side of the second overlapping area 35 in its thickness direction, which faces the first surface 311. The first adhesive layer 36 attached to the third surface 351 can tightly bond the first overlapping area 31 and the second overlapping area 35 together, greatly enhancing the adhesion between the two sides of the insulating film 30. Thanks to this adhesion, the insulating film 30 can be wrapped around the outer periphery of the electrode assembly 20 without the need for tape for fixation. The first adhesive layer 36 can be made of PMMA adhesive, which is an adhesive with polymethyl methacrylate (PMMA) as its main component.

[0052] Through the above technical solution, this embodiment simplifies the manufacturing process, reduces assembly steps, and significantly improves the reliability and stability of the battery. By relying on the first adhesive layer 36 to tightly bond the first overlapping area 31 and the second overlapping area 35, the insulating film 30 forms a closed and stable protective structure on the outer periphery of the electrode assembly 20, effectively protecting the electrode assembly 20, preventing the intrusion of external substances, and reducing the risk of internal short circuits in the battery. At the same time, eliminating the need for adhesive tape fixing greatly simplifies the manufacturing process and contributes to improved production efficiency.

[0053] In some embodiments, please refer to Figure 5 and Figure 6 The side panel 40 has a first panel 41 and a second panel 44 disposed opposite to each other. A second adhesive layer 42 is disposed on the side of the first panel 41 facing the first surface 311, and the second adhesive layer 42 is bonded to the first surface 311; the second panel 44 is bonded to the first adhesive layer 36.

[0054] It should be noted that the first plate surface 41 and the second plate surface 44 are two opposite sides of the side plate 40 in its thickness direction. During the single-cell assembly process, the first plate surface 41 faces the first surface 311 of the first overlapping area 31. A second adhesive layer 42 is provided on the side of the first plate surface 41 facing the first surface 311. The second adhesive layer 42 can be applied using a coating process to evenly cover the first plate surface 41. The second adhesive layer 42 acts to form a stable structure when the insulating film 30 surrounds the outer periphery of the electrode assembly 20, strengthening the connection between the insulating film 30 and the side plate 40, further improving the integrated molding effect. The second plate surface 44 of the side plate 40 is bonded to the first adhesive layer 36 on the third surface 351. The dual bonding mechanism of the first adhesive layer 36 and the second adhesive layer 42 precisely positions the side plate 40 between the first overlapping area 31 and the second overlapping area 35 of the insulating film 30, allowing the two overlapping areas of the insulating film 30 to adhere more tightly, forming a stable and complete encapsulation system. This system not only significantly improves the stability of the internal structure of the single cell, providing a reliable protective environment for the electrode assembly 20, but also effectively ensures the safety and reliability of the battery during actual use. The second adhesive layer 42 can be a high-temperature and corrosion-resistant adhesive layer to adapt to the high-temperature and high-pressure thermal bonding process.

[0055] In some embodiments, such as Figure 3 and Figure 4 As shown, the insulating film 30 has two first positioning holes 37 extending through its thickness direction, and the first positioning holes 37 are located in the first overlap area 31. The positions of the first positioning holes 37 on the insulating film 30 are precisely designed to achieve a precise fit with a specific structure on the side plate 40.

[0056] In addition to the first plate surface 41 and the second plate surface 44 that are attached to the insulating film 30, the side plate 40 also includes two positioning posts 43. The positioning posts 43 are located on the first plate surface 41 and can pass through the first positioning hole 37 during the assembly of the single cell. The size and shape of the positioning posts 43 are adapted to the first positioning hole 37. During the assembly stage before the side plate 40 and the insulating film 30 are integrated, the positioning posts 43 are inserted into the first positioning hole 37. This structural design plays a crucial role. On the one hand, it ensures the accurate positioning of the side plate 40 on the insulating film 30, avoiding integration defects caused by misalignment of the side plate 40, and greatly improving the precision of the integration. On the other hand, the cooperation between the positioning posts 43 and the first positioning hole 37 effectively restricts the relative movement of the side plate 40 and the insulating film 30 in the plane, ensuring the stability of their relative positions during subsequent high-temperature and high-pressure thermal bonding processes. This helps improve the quality and stability of the integration, thereby ensuring the overall performance of the single cell.

[0057] The above technical solution simplifies the manufacturing process by providing the first positioning hole 37 and the positioning post 43. These positioning structures make it easier to align and assemble the insulating film 30 and the side plate 40 with the electrode assembly 20. This improves production efficiency and reduces errors during assembly.

[0058] In some embodiments, such as Figure 3 As shown, in the first direction X, the minimum distance between one first positioning hole 37 and the edge of the first overlapping area 31 is L1mm, satisfying 53mm≤L1≤63mm; the distance between the other first positioning hole 37 and the first overlapping area 31 is L2mm, satisfying 53mm≤L2≤63mm. Specifically, the minimum distance L1mm between one first positioning hole 37 and the edge of the first overlapping area 31 can be any value or a range between any two values ​​from 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, and 63mm; the distance L2mm between the other first positioning hole 37 and the edge of the first overlapping area 31 can be any value or a range between any two values ​​from 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, and 63mm.

[0059] It should be noted that the parameter range of 53mm ≤ L2 ≤ 63mm ensures that the distance between the first positioning hole 37 and the first overlapping area 31 is within a certain range to meet design and assembly requirements. This limitation ensures the accuracy and consistency of positioning, thereby improving the assembly quality of the electrode assembly 20. By limiting the ranges of L1 and L2, it can be ensured that the distance between the first positioning hole 37 and the first overlapping area 31 is neither too large nor too small, thus avoiding instability or assembly difficulties during the assembly process. This helps to improve the assembly efficiency and consistency of the electrode assembly 20.

[0060] In some embodiments, such as Figure 4 As shown, the insulating film 30 not only has the first positioning hole 37 located in the first overlap region 31 mentioned above, but also has two second positioning holes 38 extending through its thickness direction. Both of these second positioning holes 38 are located in the second overlap region 35. It should be noted that the second positioning holes 38 work in conjunction with external equipment. Taking the Mylar film packaging machine as an example, the second positioning holes 38 are designed to cooperate with such equipment. The design and dimensions of the second positioning holes 38 are carefully planned to highly match the positioning pins or other positioning structures of the Mylar film packaging machine.

[0061] During the assembly of the insulating film 30 to the electrode assembly 20, the positioning pin of the Mylar film packaging machine can precisely insert into the second positioning hole 38, achieving precise docking and alignment between the insulating film 30 and the equipment. This precise positioning, from an assembly accuracy perspective, allows the second positioning hole 38 to guide the insulating film 30 to quickly and accurately align with other components, avoiding assembly errors caused by positioning deviations, greatly improving the assembly accuracy of the electrode assembly 20 and reducing the scrap rate. Regarding assembly consistency, the second positioning hole 38 engages with the external equipment positioning structure in the same way each time assembly is performed, ensuring a high degree of consistency in the assembly process of each electrode assembly 20, thereby achieving high stability in the quality of the electrode assembly 20. The precise positioning of the insulating film 30 during assembly, and its close cooperation with other components, enables the electrode assembly 20 to withstand various stresses during subsequent use, reducing the risk of structural loosening and performance degradation due to improper assembly, extending the service life of the electrode assembly 20, and ensuring the safety and stability of the battery in actual use.

[0062] Through the above technical solution, the second positioning hole 38, by working closely with external equipment, improves the assembly efficiency of the electrode assembly 20 and, to a certain extent, ensures the performance and stability of the individual battery.

[0063] In some embodiments, such as Figure 3 As shown, in the first direction X, the minimum distance between one second positioning hole 38 and the edge of the first overlapping area 31 is L3mm, satisfying 33mm≤L3≤43mm; the minimum distance between the other second positioning hole 38 and the edge of the first overlapping area 31 is L4mm, satisfying 33mm≤L4≤43mm. Specifically, the minimum distance L3mm between one second positioning hole 38 and the edge of the first overlapping area 31 can be any value among 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, and 43mm, or a range between any two values; similarly, the minimum distance L4mm between the other second positioning hole 38 and the edge of the first overlapping area 31 can also be any value among 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, and 43mm, or a range between any two values.

[0064] It should be noted that by limiting the minimum distance between the second positioning hole 38 and the edge of the first overlapping area 31 in the first direction X to within the range of 33mm to 43mm, the minimum distance between the second positioning hole 38 and the second overlapping area 35 in the first direction X is ensured to be within a reasonable range. This differentiated spacing design greatly improves the accuracy and consistency of positioning.

[0065] Furthermore, L3 satisfies L3≠L1 and L3≠L2; L4 satisfies L4≠L1 and L4≠L2. That is, in the first direction X, the spacing L3 cannot be the same as L1 or L2; similarly, the spacing L4 cannot be the same as L1 or L2. During the assembly of the electrode assembly 20, the first positioning hole 37 cooperates with the positioning post 43 on the side plate 40 to achieve initial positioning of the side plate 40 and the insulating film 30; the second positioning hole 38 cooperates with the positioning pin of external equipment (such as a Mylar film packaging machine) to achieve precise docking of the insulating film 30 and the external equipment. If the distance between the first positioning hole 37 and the edge of the first overlapping area 31 is the same as the distance between the second positioning hole 38 and the edge of the second overlapping area 35, positioning confusion is easily caused during assembly, leading to assembly errors. By restricting L3 to be unequal to both L1 and L2, and L4 to be unequal to both L1 and L2, the difference in the distance between the first positioning hole 37 and the second positioning hole 38 and the edge of the insulating film 30 in the first direction X is ensured, effectively avoiding confusion and errors during assembly. This not only ensures the accuracy and consistency of positioning and improves the assembly quality of the electrode assembly 20, but also significantly improves assembly efficiency, reduces rework caused by positioning errors, and lowers production costs.

[0066] In some embodiments, in the first direction X, the minimum distance between the side plate 40 and the insulating film 30 is 5 mm to 8 mm, forming a hot-melt welding zone. For better hot-melt effect, the thickness of the side plate 40 is greater than the thickness of the insulating film 30.

[0067] This application also discloses a battery pack, including the single battery cells as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery cells, which will not be repeated here.

[0068] This application also discloses an electrical device, including a single battery as described in the above embodiments, or a battery pack as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery or battery pack, which will not be repeated here.

[0069] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0070] The single battery, battery pack, and electrical equipment provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A single-cell battery, characterized in that, include: The housing (10) has a receiving cavity; An electrode assembly (20) is disposed within the receiving cavity, the electrode assembly (20) having a first direction (X); An insulating film (30) is sleeved around the outer circumference of the electrode assembly (20) and partially overlapped, and the insulating film (30) is located between the electrode assembly (20) and the housing (10); A side plate (40) is disposed along the first direction (X) on the portion of the insulating film (30) that overlaps and connects, and the side plate (40) and the insulating film (30) are integrally formed; A cover plate assembly (50) is disposed at both ends of the housing (10) and covers the cavity connected to the housing (10).

2. The single-cell battery according to claim 1, characterized in that, The insulating film (30) includes a first overlapping region (31), a first film body (32), a second film body (33), a third film body (34), a second overlapping region (35), and a first adhesive layer (36) disposed on the second overlapping region (35) in sequence; The first overlapping area (31) has a first surface (311) and a second surface (312) disposed opposite to each other, the side plate (40) is attached to the first surface (311), and the second surface (312) is attached to the electrode assembly (20); The first membrane body (32), the second membrane body (33), and the third membrane body (34) are all attached to the electrode assembly (20); The second overlapping area (35) has a third surface (351) to which the first adhesive layer (36) is attached, and the first adhesive layer (36) is bonded to the side of the side plate (40) opposite to the first surface (311).

3. The single-cell battery according to claim 2, characterized in that, The side panel (40) has a first panel (41) and a second panel (44) disposed opposite to each other. A second adhesive layer (42) is disposed on the side of the first panel (41) facing the first surface (311), and the second adhesive layer (42) is attached to the first surface (311); the second panel (44) is attached to the first adhesive layer (36).

4. The single-cell battery according to claim 3, characterized in that, The insulating film (30) has two first positioning holes (37) extending through its thickness direction, the first positioning holes (37) being located in the first overlapping area (31).

5. The single-cell battery according to claim 4, characterized in that, The side plate (40) also includes two positioning posts (43), which are disposed on the first plate surface (41) and pass through the first positioning hole (37).

6. The single-cell battery according to claim 4, characterized in that, In the first direction (X), the minimum distance between one of the first positioning holes (37) and the edge of the first overlapping area (31) is L1mm, satisfying 53mm≤L1≤63mm; the minimum distance between the other first positioning hole (37) and the edge of the first overlapping area (31) is L2mm, satisfying 53mm≤L2≤63mm.

7. The single-cell battery according to claim 3, characterized in that, The insulating film (30) has two second positioning holes (38) extending through its thickness direction, the second positioning holes (38) being located in the second overlapping area (35).

8. The single-cell battery according to claim 7, characterized in that, In the first direction (X), the minimum distance between one of the second positioning holes (38) and the edge of the first overlapping area (31) is L3mm, satisfying 33mm≤L3≤43mm; the minimum distance between the other second positioning hole (38) and the edge of the first overlapping area (31) is L4mm, satisfying 33mm≤L4≤43mm.

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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