Battery cell

Abstract

The invention discloses a battery monomer, and relates to the technical field of batteries. The battery monomer comprises a shell, a side end cover, an electrode assembly and an insulating part, and the shell is provided with a cavity and an opening communicated with the cavity; the side end cover is arranged on the shell and is used for sealing the opening; the electrode assembly is arranged in the cavity, and the electrode assembly is provided with a first surface and a second surface in the height direction of the battery monomer; the insulating part wraps the outer side of the electrode assembly and is overlapped on the first surface of the electrode assembly to form a supporting part used for supporting the electrode assembly. The supporting part can increase the thickness of the insulating part in the height direction of the battery monomer, and can replace an original side support structure to avoid introduction of new materials, so that the assembly efficiency is improved, and the production cost is reduced. In addition, when the electrode assembly with the supporting part is arranged in the shell, the electrode assembly can be tightly assembled with the shell, so that the problem of tab tearing caused by movement of the electrode assembly in the production process is avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery cell. Background Technology

[0002] In traditional battery cell assembly, to prevent interference between the electrode assembly and the inner corners of the casing, side supports are placed on the top and bottom surfaces of the electrode assembly and secured to the assembly using a C-shaped adhesive method. Subsequently, an inner insulating film (Mylar film) is wrapped around the electrode assembly using a U-shaped wrapping method to provide internal insulation protection. However, this assembly method requires side supports to support the electrode assembly and prevent interference with the inner corners of the casing. From the perspective of battery cell materials, this introduces the material cost of the side supports. From the perspective of the assembly process, it requires side support positioning, material loading, and insulating film installation processes, all of which require corresponding equipment. Therefore, overall, this increases the material cost, equipment cost, and manufacturing cost of the battery. Summary of the Invention

[0003] The purpose of this invention is to provide a battery cell assembly that solves the problem that using existing side supports to support electrode components increases the material cost of battery cells as well as equipment and manufacturing costs.

[0004] This application provides a battery cell, including a housing having a cavity and an opening communicating with the cavity; a side end cap disposed on the housing for closing the opening; an electrode assembly disposed in the cavity, the electrode assembly having a first surface and a second surface in the height direction of the battery cell; and an insulating member wrapped around the outside of the electrode assembly and overlapping at the first surface of the battery cell.

[0005] In some embodiments, the electrode assembly further has a third surface and a fourth surface, the first surface being disposed opposite to the second surface, and the third surface being disposed opposite to the fourth surface; the insulating member includes a first covering area, a second covering area, a third covering area, a fourth covering area, and a fifth covering area, the first covering area being wrapped around the first surface, the second covering area being wrapped around the second surface, the third covering area being wrapped around the third surface, the fourth covering area being wrapped around the fourth surface, and the fifth covering area being at least partially wrapped around the first covering area to form a first support portion.

[0006] In some embodiments, the thickness of the second coverage area, the thickness of the third coverage area, and the thickness of the fourth coverage area are all equal; the thickness of the second coverage area is less than the thickness of the first coverage area and / or the fifth coverage area.

[0007] In some embodiments, the thickness of the first support portion is 0.2-1 mm.

[0008] In some embodiments, the battery cell further includes a side support piece disposed between the second surface and the third coverage area.

[0009] In some embodiments, the insulating element includes: a first insulating film wrapped around the outside of the electrode assembly; and a second insulating film wrapped around the outside of the electrode assembly; wherein the first insulating film and the second insulating film at least partially overlap at a first surface and / or a second surface of the battery cell.

[0010] In some embodiments, the first insulating film wraps around the outside of the second insulating film at the first surface to form a second support portion, and the second insulating film wraps around the outside of the first insulating film at the second surface of the battery cell to form a third support portion; or, the second insulating film wraps around the outside of the first insulating film at the first surface to form a second support portion, and the first insulating film wraps around the outside of the second insulating film at the second surface to form a third support portion; or, the second insulating film wraps around the outside of the first insulating film at the first surface to form a second support portion, and the second insulating film wraps around the outside of the second insulating film at the second surface to form a third support portion; or, the second insulating film wraps around the outside of the first insulating film at the first surface to form a second support portion, and the second insulating film wraps around the outside of the first insulating film at the second surface to form a third support portion.

[0011] In some embodiments, the electrode assembly further has a third surface and a fourth surface, the first surface and the second surface being disposed opposite to each other, and the third surface and the fourth surface being disposed opposite to each other; the first insulating film includes a first sub-covering area, a second sub-covering area and a third sub-covering area, the first sub-covering area being wrapped around the first surface, the second sub-covering area being wrapped around the second surface, and the third sub-covering area being wrapped around the third surface; the second insulating film includes a fourth sub-covering area, a fifth sub-covering area and a sixth sub-covering area, the fourth sub-covering area being wrapped around the first surface, the fifth sub-covering area being wrapped around the second surface, and the sixth sub-covering area being wrapped around the fourth surface; Wherein, the first sub-coverage area is disposed between the first surface and the fourth sub-coverage area, and the fifth sub-coverage area is disposed between the second surface and the second sub-coverage area; or, the fourth sub-coverage area is disposed between the first surface and the first sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area; or, the first sub-coverage area is disposed between the first surface and the fourth sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area; or, the fourth sub-coverage area is disposed between the first surface and the first sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area.

[0012] In some embodiments, the thickness of the first sub-coverage area is equal to the thickness of the second sub-coverage area, the thickness of the third sub-coverage area is less than the thickness of the first sub-coverage area, the thickness of the fourth sub-coverage area is equal to the thickness of the fifth sub-coverage area, and the thickness of the sixth sub-coverage area is less than the thickness of the fourth sub-coverage area.

[0013] In some embodiments, the thicknesses of the first sub-coverage area, the second sub-coverage area, the fourth sub-coverage area, and the fifth sub-coverage area are all equal; the thicknesses of the third sub-coverage area and the sixth sub-coverage area are equal.

[0014] In some embodiments, the thickness of the first insulating film is 0.1-0.5 mm; the thickness of the second insulating film is 0.1-0.5 mm.

[0015] In some embodiments, the thickness of the second support portion and / or the third support portion is 0.2-1 mm.

[0016] In some embodiments, the insulating member has a first through hole on a first surface and a second through hole on a second surface, wherein the first through hole is offset from the second through hole in the height direction of the battery cell.

[0017] The technical advantage of this invention lies in providing a battery cell comprising a housing, a side end cap, an electrode assembly, and an insulating member. The housing has a cavity and an opening communicating with the cavity. The side end cap is disposed on the housing to close the opening. The electrode assembly is disposed within the cavity and has a first surface and a second surface in the height direction of the battery cell. The insulating member wraps around the outside of the electrode assembly and overlaps at the first surface of the electrode assembly to form a support portion for supporting the electrode assembly. This support portion can increase the thickness of the insulating member in the height direction of the battery cell, thus replacing the original side support structure, avoiding the introduction of new materials, thereby improving assembly efficiency and reducing production costs. Furthermore, when the electrode assembly with this support portion is disposed within the housing, it can be tightly assembled with the housing to avoid the problem of electrode assembly moving during production and causing tab tearing. Attached Figure Description

[0018] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of this application.

[0020] Figure 2 for Figure 1 Schematic diagram of the provided electrode assembly Figure 1 .

[0021] Figure 3 for Figure 1 Schematic diagram of the provided electrode assembly Figure 2 .

[0022] Figure 4 for Figure 1 A schematic diagram of the provided insulating component in its flattened state.

[0023] Figure 5 for Figure 1 The cross-section of the battery cell along its thickness provided in the image. Figure 1 .

[0024] Figure 6 A cross-sectional view along the length of a single battery cell provided in the embodiments of this application. Figure 1 .

[0025] Figure 7 A cross-sectional view of a battery cell along its thickness direction provided in the embodiments of this application. Figure 2 .

[0026] Figure 8 A cross-sectional view along the length of a single battery cell provided in the embodiments of this application. Figure 2 .

[0027] Figure 9 A cross-sectional view of a battery cell along its thickness direction provided in the embodiments of this application. Figure 3 .

[0028] Figure 10 A cross-sectional view of the battery cell along its length provided in the embodiments of this application. Figure 2 .

[0029] Figure 11 A cross-sectional view of the battery cell along its thickness direction provided in the embodiments of this application. Figure 3 .

[0030] Figure 12 A cross-sectional view of the battery cell along its length provided in the embodiments of this application. Figure 3 .

[0031] Figure 13 A cross-sectional view of the battery cell along its thickness direction provided in the embodiments of this application. Figure 4 .

[0032] Figure 14 This application provides a schematic diagram of the structure of the first insulating film.

[0033] Figure 15 This application provides a schematic diagram of the structure of the second insulating film.

[0034] Component labels in the attached diagram:

[0035] 1. Shell; 10. Cavity; 11. Opening;

[0036] 2. Side end caps;

[0037] 3. Electrode assembly; 31. First surface; 32. Second surface; 33. Third surface; 34. Fourth surface;

[0038] 4. Insulating components;

[0039] 401 First Coverage Zone; 402 Second Coverage Zone; 403 Third Coverage Zone; 404 Fourth Coverage Zone; 405 Fifth Coverage Zone;

[0040] 41 First insulating film; 411 First sub-coverage area; 412 Second sub-coverage area; 413 Third sub-coverage area;

[0041] 42 Second insulating film; 421 Fourth sub-coverage area; 422 Fifth sub-coverage area; 423 Sixth sub-coverage area;

[0042] 5 side support pieces;

[0043] 61 First support section; 62 Second support section; 63 Third support section;

[0044] 610 First through hole; 620 Second through hole;

[0045] 7. Adhesive tape. Detailed Implementation

[0046] 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.

[0047] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] To address the technical problem that existing side supports for electrode assemblies increase material and equipment costs, this application provides a battery cell comprising a housing, a side end cap, an electrode assembly, and an insulating component. The housing has a cavity and an opening communicating with the cavity; the side end cap is disposed on the housing to close the opening; the electrode assembly is disposed within the cavity and has a first surface and a second surface in the height direction of the battery cell; the insulating component wraps around the outside of the electrode assembly and overlaps at the first surface of the electrode assembly to form a support portion for supporting the electrode assembly. This support portion can increase the thickness of the insulating component in the height direction of the battery cell and can replace other support structures, avoiding the introduction of new materials, thereby improving assembly efficiency and reducing production costs. Furthermore, when the electrode assembly is disposed within the housing, the support portion can abut against the inner surface of the housing to prevent the electrode assembly from shaking within the housing and to prevent tearing of the electrode tabs. A detailed description follows.

[0051] like Figure 1 As shown, this application embodiment provides a battery cell with intersecting first direction X, second direction Y and third direction Z, wherein the first direction X is the length direction, the second direction Y is the thickness direction and the third direction Z is the height direction.

[0052] The battery cell includes a casing 1, a side end cover 2, an electrode assembly 3, and an insulating component 4.

[0053] The housing 1 has a cavity 10 and an opening 11 communicating with the cavity 10.

[0054] The housing 1 may be made of a strong material such as metal, but is not limited to this. For example, the housing 1 may be made of an aluminum profile, but is not limited to this.

[0055] Side end cap 2 is provided on housing 1 to close opening 11.

[0056] The side end cover 2 can be integrally formed with the housing 1, that is, the side end cover 2 and the housing 1 are an integral structure; the side end cover 2 can also be fixedly connected to the housing 1, for example, the side end cover 2 is fixedly connected to one end of the housing 1 in the first direction by welding or other processes. This application does not impose specific limitations, and can be specifically configured according to actual circumstances. For example, in this application, the side end cover 2 and the housing 1 are separately disposed, and the side end cover 2 and the housing 1 are fixedly welded together.

[0057] The side end cover 2 may be equipped with components such as a positive terminal, a negative terminal, a liquid injection hole, and an explosion-proof valve, which will not be described in detail here.

[0058] like Figures 1 to 3 As shown, the electrode assembly 3 is disposed in the cavity 10. The electrode assembly 3 has a first surface 31 and a second surface 32 in the height direction of the battery cell. The insulating member 4 is wrapped around the outside of the electrode assembly 3 and overlaps at the first surface 31 of the electrode assembly 3 to support the first surface 31 of the electrode assembly 3 and replace other support structures, avoiding the introduction of new materials, and also improving assembly efficiency and reducing production costs.

[0059] The electrode assembly 3 also has a third surface 33 and a fourth surface 34, with the first surface 31 and the second surface 32 disposed opposite to each other, and the third surface 33 and the fourth surface 34 disposed opposite to each other. Specifically, the first surface 31 is disposed opposite to the second surface 32 in the height direction of the battery cell, and the third surface 33 is disposed opposite to the fourth surface 34 in the thickness direction of the battery cell.

[0060] The electrode assembly 3 includes a first electrode, a second electrode, and a separator, with the separator disposed between the first and second electrodes. The first and second electrodes have opposite polarities. The first electrode can be either a positive or a negative electrode. For example, in the embodiments of this application, the first electrode is a positive electrode, and the second electrode is a negative electrode.

[0061] like Figures 4 to 5 As shown, the insulating element 4 includes a first covering area 401, a second covering area 402, a third covering area 403, a fourth covering area 404, and a fifth covering area 405. The connection sequence of the insulating element 4 is as follows: first covering area 401, third covering area 403, second covering area 402, fourth covering area 404, and fifth covering area 405.

[0062] The first covering area 401 is wrapped around the first surface 31, the second covering area 402 is wrapped around the second surface 32, the third covering area 403 is wrapped around the third surface 33, the fourth covering area 404 is wrapped around the fourth surface 34, and the fifth covering area 405 is at least partially wrapped on the first covering area 401 to form a first support portion 61. This first support portion 61 can replace other support structures, prevent the entry of new materials, and can also improve the assembly efficiency and reduce the production cost. In addition, when the electrode assembly 3 is disposed in the housing 1, the first support portion 61 can abut against the inner surface of the housing 1 to prevent the electrode assembly 3 from shaking in the housing 1 and the problem of the tab being torn.

[0063] The insulating member 4 is an insulating film, which can be called a Mylar film. The insulating member 4 forms a "hui" - shaped structure by folding and wraps the electrode assembly 3 in a "hui" - shaped covering manner, such that the head and tail end regions of the insulating member 4 overlap to form the first support portion 61. Among them, the first covering area 401 serves as the head end region of the insulating member 4, and the fifth covering area 405 serves as the tail end region of the insulating member 4.

[0064] The thickness of the second covering area 402, the thickness of the third covering area 403, and the thickness of the fourth covering area 404 are all equal. Among them, the thickness of the second covering area 402 is less than the thickness of the first covering area 401 and / or the fifth covering area 405.

[0065] The thickness of the first covering area 401 can be greater than the thickness of the fifth covering area 405, or the thickness of the first covering area 401 can be less than the thickness of the fifth covering area 405. Exemplarily, in the present application, the thickness of the first covering area 401 is equal to the thickness of the fifth covering area 405.

[0066] The thickness of the first support portion 61 is 0.2 - 1 mm, that is, the thickness of the first support portion 61 is the sum of the thicknesses of the first covering area 401 and the fifth covering area 405, which is 0.2 - 1 mm. It can be understood that the thickness (unit: mm) of the first support portion 61 is any value among 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 or a value between any two of them. Therefore, the thickness of the first support portion 61 can ensure the support strength of the first support portion 61 for the electrode assembly 3, and can prevent the space utilization rate of the cavity 10 of the housing 1 from being reduced due to the excessive thickness of the first support portion 61, thereby reducing the energy density of the entire battery cell. If the thickness of the first support portion 61 is too small, it will result in insufficient support strength for the electrode assembly 3, easily causing interference and dropping of materials between the electrode assembly 3 and the inner corner of the housing 1, leading to an internal short - circuit and increasing the safety risk of the battery cell.

[0067] Optionally, the thickness of the first support portion 61 can be 0.5-1mm, which can further ensure the support strength of the first support portion 61 for the electrode assembly 3, and can avoid the space utilization rate of the cavity 10 that accommodates the electrode assembly 3 being reduced due to the excessive thickness of the first support portion 61, thereby reducing the energy density of the entire battery cell.

[0068] In one embodiment, the insulating member 4 has a first through hole 610 on the first surface 31 of the electrode assembly and a second through hole 620 on the second surface 32 of the battery cell. The first through hole 610 is offset from the second through hole 620 in the height direction of the battery cell. This enhances the electrolyte wetting ability of the electrode assembly 3 and extends the service life of the battery cell. Furthermore, the offset opening of the insulating member 4 reduces the risk of short circuits caused by material blockage during battery cell use. Specifically, the first through hole 610 penetrates the first coverage area 401 and the fifth coverage area 405, and the second through hole 620 penetrates the third coverage area 403.

[0069] like Figure 5 As shown, in one embodiment, the battery cell further includes a side support 5, which is disposed on the second surface 32 of the electrode assembly 3 to support the second surface 32 of the electrode assembly 3. Specifically, the side support 5 is disposed between the second surface 32 and the third covering area 403 to support and fix the second surface 32 of the electrode assembly 3.

[0070] Therefore, the insulating member 4 overlaps with the first surface 31 of the electrode assembly 3 to form a first support portion 61, and a side support member 5 is provided between the insulating member 4 and the second surface 32 of the electrode assembly 3 to support the two surfaces of the electrode assembly 3 in the height direction of the battery cell. When the electrode assembly 3 is disposed inside the housing 1, both the first support portion 61 and the side support member 5 can support and abut against the inner surface of the housing 1, thereby preventing the electrode assembly 3 from shaking inside the housing 1 and reducing the risk of electrode tab tearing. For example, the first surface 31 of the electrode assembly 3 can be the top surface, the second surface 32 can be the bottom surface, the inner surface of the first support portion 61 that contacts the housing 1 is the inner top surface, and the inner surface of the side support member 5 that contacts the housing 1 is the inner bottom surface.

[0071] like Figures 6 to 15As shown, in one embodiment, the insulating member 4 includes a first insulating film 41 and a second insulating film 42. The first insulating film 41 wraps around the outside of the electrode assembly 3. The second insulating film 42 wraps around the outside of the electrode assembly 3. The first insulating film 41 and the second insulating film 42 at least partially overlap at the first surface 31 and / or the second surface 32 of the electrode assembly 3. This can be understood as the first insulating film 41 and the second insulating film 42 partially or completely overlapping at the first surface 31 of the electrode assembly 3. Alternatively, the first insulating film 41 and the second insulating film 42 partially or completely overlap at the second surface 32 of the electrode assembly 3. Or, the first insulating film 41 and the second insulating film 42 partially or completely overlap at the first surface 31 and the second surface 32 of the electrode assembly 3.

[0072] The first insulating film 41 and the second insulating film 42 at least partially overlap, including the following embodiments:

[0073] like Figures 6 to 7 As shown, in the first embodiment, the first insulating film 41 wraps around the outside of the second insulating film 42 at the first surface 31 of the electrode assembly 3 to form a second support portion 62, and the second insulating film 42 wraps around the outside of the first insulating film 41 at the second surface 32 of the battery cell to form a third support portion 63. Therefore, the electrode assembly 3 forms two support portions on each of its two surfaces in the height direction of the battery cell, which can replace other support structures (such as side supports), avoid the introduction of new materials, and also improve assembly efficiency and reduce production costs. When the electrode assembly 3 is disposed inside the housing 1, both the second support portion 62 and the third support portion 63 can be in close contact with the inner surface of the housing 1 to prevent the electrode assembly 3 from shaking inside the housing 1 and causing the tabs to tear.

[0074] like Figures 2 to 3 As shown, the electrode assembly 3 includes a first surface 31, a second surface 32, a third surface 33, and a fourth surface 34. The first surface 31 and the second surface 32 are disposed opposite to each other, and the third surface 33 and the fourth surface 34 are disposed opposite to each other.

[0075] like Figure 6 , Figure 7 , Figure 14 as well as Figure 15 As shown, the first insulating film 41 includes a first sub-covering area 411, a second sub-covering area 412, and a third sub-covering area 413. The connection sequence of the first insulating film 41 is as follows: the first sub-covering area 411, the third sub-covering area 413, and the second sub-covering area 412. The first sub-covering area 411 is wrapped around the first surface 31, the second sub-covering area 412 is wrapped around the second surface 32, and the third sub-covering area 413 is wrapped around the third surface 33.

[0076] The second insulating film 42 includes a fourth sub-covering area 421, a fifth sub-covering area 422, and a sixth sub-covering area 423. The connection sequence of the second insulating film 42 is as follows: the fourth sub-covering area 421, the sixth sub-covering area 423, and the fifth sub-covering area 422.

[0077] The fourth sub-coverage area 421 wraps around the first surface 31, the fifth sub-coverage area 422 wraps around the second surface 32, and the sixth sub-coverage area 423 wraps around the fourth surface 34. The first sub-coverage area 411 is located between the first surface 31 and the fourth sub-coverage area 421, and the fifth sub-coverage area 422 is located between the second surface 32 and the second sub-coverage area 412. That is, one end of the first insulating film 41 wraps around the outside of the second insulating film 42 to form a second support portion 62, and the other end of the first insulating film 41 is located inside the second insulating film 42 and is wrapped by the second insulating film 42 to form a third support portion 63. This increases the thickness of the insulating component 4 in the height direction of the battery cell, so that the insulating component 4 can improve insulation performance, reduce short-circuit faults, and also support the electrode assembly 3. When the electrode assembly 3 is placed inside the housing 1, both the second support portion 62 and the third support portion 63 can abut against the inner surface of the housing 1 to prevent the electrode assembly 3 from shaking and tearing of the tabs inside the housing 1.

[0078] like Figures 8 to 9 As shown, in the second embodiment, the second insulating film 42 wraps around the outside of the first insulating film 41 at the first surface 31 of the electrode assembly 3 to form a second support portion 62, and the first insulating film 41 wraps around the outside of the second insulating film 42 at the second surface 32 of the battery cell to form a third support portion 63. Therefore, the electrode assembly 3 forms two support portions on each of its two surfaces in the height direction of the battery cell, which can replace other support structures (such as side supports), avoid the introduction of new materials, and also improve assembly efficiency and reduce production costs. When the electrode assembly 3 is disposed inside the housing 1, both the second support portion 62 and the third support portion 63 can be in close contact with the inner surface of the housing 1 to prevent the electrode assembly 3 from moving within the housing 1 and causing the tabs to tear.

[0079] like Figures 2 to 3 As shown, the electrode assembly 3 includes a second surface 32, a third surface 33, a fourth surface 34 and a first surface 31 connected together. The second surface 32 is disposed opposite to the first surface 31, and the third surface 33 is disposed opposite to the fourth surface 34.

[0080] like Figure 8 , Figure 9 , Figure 14 as well as Figure 15As shown, the first insulating film 41 includes a first sub-covering area 411, a second sub-covering area 412, and a third sub-covering area 413. The connection sequence of the first insulating film 41 is as follows: the first sub-covering area 411, the third sub-covering area 413, and the second sub-covering area 412. The first sub-covering area 411 is wrapped around the first surface 31, the second sub-covering area 412 is wrapped around the second surface 32, and the third sub-covering area 413 is wrapped around the third surface 33.

[0081] The second insulating film 42 includes a fourth sub-covering area 421, a fifth sub-covering area 422, and a sixth sub-covering area 423. The connection sequence of the second insulating film 42 is as follows: the fourth sub-covering area 421, the sixth sub-covering area 423, and the fifth sub-covering area 422. The fourth sub-covering area 421 is wrapped around the first surface 31, the fifth sub-covering area 422 is wrapped around the second surface 32, and the sixth sub-covering area 423 is wrapped around the fourth surface 34. The fourth sub-covering area 421 is disposed between the first surface 31 and the first sub-covering area 421, and the second sub-covering area 422 is disposed between the second surface 32 and the fifth sub-covering area 422. That is, one end of the second insulating film 42 wraps around the outside of the first insulating film 41 to form a second support portion 62, and the other end of the second insulating film 42 is disposed inside the first insulating film 41 and wrapped by the first insulating film 41 to form a third support portion 63. This increases the thickness of the insulating component 4 in the height direction of the battery cell, so that the insulating component 4 can not only improve the insulation performance and reduce short circuit faults, but also support the electrode assembly 3. When the electrode assembly 3 is disposed in the housing 1, both the second support portion 62 and the third support portion 63 can be in close contact with the inner surface of the housing 1 to avoid the electrode assembly 3 from moving inside the housing 1 and causing the tabs to tear.

[0082] like Figures 10 to 11 As shown, in the third embodiment, the first insulating film 41 wraps around the outside of the second insulating film 42 at the first surface 31 of the electrode assembly 3 to form a second support portion 62, and the first insulating film 41 wraps around the outside of the second insulating film 42 at the second surface 32 of the battery cell to form a third support portion 63.

[0083] like Figures 2 to 3 As shown, the electrode assembly 3 includes a first surface 31, a second surface 32, a third surface 33, and a fourth surface 34. The first surface 31 and the second surface 32 are disposed opposite to each other, and the third surface 33 and the fourth surface 34 are disposed opposite to each other.

[0084] like Figure 10 , Figure 11 , Figure 14 as well as Figure 15As shown, the first insulating film 41 includes a first sub-covering area 411, a second sub-covering area 412, and a third sub-covering area 413. The connection sequence of the first insulating film 41 is as follows: the first sub-covering area 411, the third sub-covering area 413, and the second sub-covering area 412. The first sub-covering area 411 is wrapped around the first surface 31, the second sub-covering area 412 is wrapped around the second surface 32, and the third sub-covering area 413 is wrapped around the third surface 33.

[0085] The second insulating film 42 includes a fourth sub-covering area 421, a fifth sub-covering area 422, and a sixth sub-covering area 423. The connection sequence of the second insulating film 42 is as follows: the fourth sub-covering area 421, the sixth sub-covering area 423, and the fifth sub-covering area 422.

[0086] The fourth sub-coverage area 421 wraps around the first surface 31, the fifth sub-coverage area 422 wraps around the second surface 32, and the sixth sub-coverage area 423 wraps around the fourth surface 34. The first sub-coverage area 411 is located between the first surface 31 and the fourth sub-coverage area 421, and the second sub-coverage area 412 is located between the second surface 32 and the fifth sub-coverage area 422. That is, one end of the first insulating film 41 wraps around the outer side of one end of the second insulating film 42 to form a second support portion 62, and the other end of the first insulating film 41 also wraps around the outer side of the other end of the second insulating film 42 to form a third support portion 63. This increases the thickness of the insulating component 4 in the height direction of the battery cell, so that the insulating component 4 can improve insulation performance, reduce short-circuit faults, and also support the electrode assembly 3. When the electrode assembly 3 is disposed inside the housing 1, both the second support portion 62 and the third support portion 63 can abut against the inner surface of the housing 1 to prevent the electrode assembly 3 from moving within the housing 1 and causing the tabs to tear.

[0087] like Figures 12 to 13 As shown, in the fourth embodiment, the second insulating film 42 wraps around the outside of the first insulating film 41 at the first surface 31 of the electrode assembly 3 to form a second support portion 62, and the second insulating film 42 wraps around the outside of the first insulating film 41 at the second surface 32 of the battery cell to form a third support portion 63.

[0088] like Figures 2 to 3 As shown, the electrode assembly 3 includes a first surface 31, a second surface 32, a third surface 33, and a fourth surface 34. The first surface 31 and the second surface 32 are disposed opposite to each other, and the third surface 33 and the fourth surface 34 are disposed opposite to each other.

[0089] like Figure 12 , Figure 13 , Figure 14 as well as Figure 15As shown, the first insulating film 41 includes a first sub-covering area 411, a second sub-covering area 412, and a third sub-covering area 413. The connection sequence of the first insulating film 41 is as follows: the first sub-covering area 411, the third sub-covering area 413, and the second sub-covering area 412. The first sub-covering area 411 is wrapped around the first surface 31, the second sub-covering area 412 is wrapped around the second surface 32, and the third sub-covering area 413 is wrapped around the third surface 33.

[0090] The second insulating film 42 includes a fourth sub-covering area 421, a fifth sub-covering area 422, and a sixth sub-covering area 423. The connection sequence of the second insulating film 42 is as follows: the fourth sub-covering area 421, the sixth sub-covering area 423, and the fifth sub-covering area 422. The fourth sub-covering area 421 is wrapped around the first surface 31, the fifth sub-covering area 422 is wrapped around the second surface 32, and the sixth sub-covering area 423 is wrapped around the fourth surface 34. The fourth sub-covering area 421 is located between the first surface 31 and the first sub-covering area 411, and the second sub-covering area 412 is located between the second surface 32 and the fifth sub-covering area 422. That is, one end of the second insulating film 42 wraps around the outer side of one end of the first insulating film 41 to form a second support portion 62, and the other end of the second insulating film 42 also wraps around the outer side of the other end of the first insulating film 41 to form a third support portion 63. This increases the thickness of the insulating component 4 in the height direction of the battery cell, so that the insulating component 4 can improve insulation performance, reduce short-circuit faults, and also support the electrode assembly 3. When the electrode assembly 3 is disposed inside the housing 1, the second support 62 and the third support 63 can both abut against the inner surface of the housing 1 to avoid the electrode assembly 3 from moving inside the housing 1 and causing the tabs to tear.

[0091] In the above embodiments, the thickness of the first sub-coverage area 411 is equal to the thickness of the second sub-coverage area 412, the thickness of the third sub-coverage area 413 is less than the thickness of the first sub-coverage area 411, the thickness of the fourth sub-coverage area 421 is equal to the thickness of the fifth sub-coverage area 422, and the thickness of the sixth sub-coverage area 423 is less than the thickness of the fourth sub-coverage area 421.

[0092] In some embodiments, the thicknesses of the first sub-covering area 411, the second sub-covering area 412, the fourth sub-covering area 421, and the fifth sub-covering area 422 are all equal, and the thicknesses of the third sub-covering area 413 and the sixth sub-covering area 423 are equal. This ensures that the structures of the first insulating film 41 and the second insulating film 42 are completely identical, avoiding the introduction of insulating films with different structures, thereby improving assembly efficiency and reducing production costs. Of course, in other embodiments, the thicknesses of each region of the first insulating film 41 and each region of the second insulating film 42 can be set according to actual needs, and no particular limitation is made here.

[0093] The thickness of the first insulating film 41 is 0.1-0.5 mm. It can be understood that the thickness (unit: mm) of the first insulating film 41 is any one of 0.1, 0.2, 0.3, 0.4, 0.5 or any value between any two values.

[0094] The thickness of the second insulating film 42 is 0.1-0.5 mm. It can be understood that the thickness (unit: mm) of the second insulating film 42 is any one of 0.1, 0.2, 0.3, 0.4, 0.5 or any value between any two values.

[0095] The thickness of the second support portion 62 is 0.2-1 mm, which is the sum of the thicknesses of the first insulating film 41 and the second insulating film 42 at the first surface 31 of the electrode assembly 3. It can be understood that the thickness (in mm) of the second support portion 62 is any one of 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1, or any value between any two values. Therefore, the thickness of the second support portion 62 ensures sufficient support strength for the first surface 31 of the electrode assembly 3, and avoids excessive thickness leading to reduced space utilization of the cavity 10 of the housing 1, thereby reducing the energy density of the battery cell. If the thickness of the second support portion 62 is too small, the support strength for the first surface 31 of the electrode assembly 3 will be insufficient, easily causing interference and material loss between the inner corner of the electrode assembly 3 and the housing 1, leading to an internal short circuit and increasing the safety risk of the battery cell.

[0096] Optionally, the thickness of the second support portion 62 can be 0.5-1mm, which can further ensure the support strength of the second support portion 62 on the first surface 31 of the electrode assembly 3, and can avoid the space utilization rate of the cavity 10 accommodating the electrode assembly 3 being reduced due to the excessive thickness of the second support portion 62, thereby reducing the energy density of the battery cell.

[0097] The thickness of the third support portion 63 is 0.2-1 mm, which is the sum of the thicknesses of the first insulating film 41 and the second insulating film 42 at the second surface 32 of the electrode assembly 3. It can be understood that the thickness (unit: mm) of the third support portion 63 is any one of 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1, or any value between any two values. Therefore, the thickness of the third support portion 63 ensures sufficient support strength for the second surface 32 of the electrode assembly 3, and avoids excessive thickness of the second support portion 62 leading to reduced space utilization of the cavity 10 of the housing 1, thereby reducing the energy density of the battery cell. If the thickness of the third support portion 63 is too small, the support strength for the second surface 32 of the electrode assembly 3 will be insufficient, easily causing interference and material loss between the electrode assembly 33 and the inner corner of the housing 1, leading to an internal short circuit and increasing the safety risk of the battery cell.

[0098] Optionally, the thickness of the third support portion 63 can be 0.5-1mm, which can further ensure the support strength of the third support portion 63 on the second surface 32 of the electrode assembly 3, and can avoid the space utilization rate of the cavity 10 accommodating the electrode assembly 3 being reduced due to the excessive thickness of the third support portion 63, thereby reducing the energy density of the battery cell.

[0099] like Figures 14 to 15 As shown, in one embodiment, the insulating member 4 has a first through hole 610 on its first surface 31 and a second through hole 620 on its second surface 32. The first through hole 610 is offset from the second through hole 620 in the height direction of the battery cell. This enhances the electrolyte wetting ability of the electrode assembly 3 and improves the service life of the battery cell. Furthermore, the offset opening of the insulating member 4 reduces the risk of short circuits caused by material blockage during battery cell use.

[0100] Specifically, the first through-hole 610 includes a first sub-through-hole 610a and a second sub-through-hole 610b. The first sub-through-hole 610a penetrates the first sub-coverage area 411, and the second sub-through-hole 610b penetrates the fourth sub-coverage area 421. The second through-hole 620 includes a third sub-through-hole 620a and a fourth sub-through-hole 620b. The third sub-through-hole 620a penetrates the third sub-coverage area 413, and the fourth sub-through-hole 620b penetrates the sixth sub-coverage area 423. When the first insulating film 41 and the second insulating film 42 are folded, the first sub-through-hole 610a and the second sub-through-hole 610b are positioned opposite each other, and the third sub-through-hole 620a and the fourth sub-through-hole 620b are positioned opposite each other.

[0101] In one embodiment, the battery cell further includes adhesive tape 7, which is used to fix the electrode assembly 3. This makes fixing the electrode assembly 3 more convenient and eliminates the need for other structures on the electrode assembly 3 for fixing. Specifically, the electrode assembly 3 is fixed by bonding multiple strips of adhesive tape 7, which are spaced apart along the length of the battery cell. Compared to using a long, continuous strip of adhesive tape 7 to fix the electrode assembly 3, the spaced-apart strips of adhesive tape 7 can save on the amount of adhesive tape 7 used while meeting the requirements for fixing, thus saving costs.

[0102] 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.

[0103] The above provides a detailed description of a battery cell and battery pack provided in the embodiments of this application. 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. 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 battery cell, characterized in that, include: A housing having a cavity and an opening communicating with the cavity; A side end cap, disposed on the housing, is used to close the opening; An electrode assembly is disposed within the cavity, and the electrode assembly has a first surface and a second surface in the height direction of the battery cell. An insulating element is wrapped around the outside of the electrode assembly and overlaps at the first surface of the battery cell.

2. The battery cell according to claim 1, characterized in that, The electrode assembly also has a third surface and a fourth surface, wherein the first surface is disposed opposite to the second surface, and the third surface is disposed opposite to the fourth surface; The insulating element includes a first covering area, a second covering area, a third covering area, a fourth covering area, and a fifth covering area. The first covering area is wrapped around the first surface, the second covering area is wrapped around the second surface, the third covering area is wrapped around the third surface, the fourth covering area is wrapped around the fourth surface, and the fifth covering area is at least partially wrapped around the first covering area to form a first support portion.

3. The battery cell according to claim 2, characterized in that, The thicknesses of the second coverage area, the third coverage area, and the fourth coverage area are all equal; the thickness of the second coverage area is less than the thickness of the first coverage area and / or the fifth coverage area.

4. The battery cell according to claim 2, characterized in that, The thickness of the first support portion is 0.2-1mm.

5. The battery cell according to claim 2, characterized in that, Also includes: A side support is disposed between the second surface and the third coverage area.

6. The battery cell according to claim 1, characterized in that, The insulating component includes: A first insulating film is wrapped around the outside of the electrode assembly; and A second insulating film is wrapped around the outside of the electrode assembly; Wherein, the first insulating film and the second insulating film at least partially overlap at the first surface and / or the second surface of the battery cell.

7. The battery cell according to claim 6, characterized in that, The first insulating film wraps around the outside of the second insulating film at the first surface to form a second support portion, and the second insulating film wraps around the outside of the first insulating film at the second surface of the battery cell to form a third support portion; or, The second insulating film wraps around the outside of the first insulating film at the first surface to form a second support portion, and the first insulating film wraps around the outside of the second insulating film at the second surface to form a third support portion; or, The first insulating film wraps around the outside of the second insulating film at the first surface to form the second support portion, and the first insulating film wraps around the outside of the second insulating film at the second surface to form the third support portion; or, The second insulating film wraps around the outside of the first insulating film at the first surface to form a second support portion, and the second insulating film wraps around the outside of the first insulating film at the second surface to form a third support portion.

8. The battery cell according to claim 7, characterized in that, The electrode assembly also has a third surface and a fourth surface, wherein the first surface is disposed opposite to the second surface, and the third surface is disposed opposite to the fourth surface; The first insulating film includes a first sub-covering area, a second sub-covering area, and a third sub-covering area. The first sub-covering area is wrapped around the first surface, the second sub-covering area is wrapped around the second surface, and the third sub-covering area is wrapped around the third surface. The second insulating film includes a fourth sub-covering area, a fifth sub-covering area, and a sixth sub-covering area. The fourth sub-covering area is wrapped around the first surface, the fifth sub-covering area is wrapped around the second surface, and the sixth sub-covering area is wrapped around the fourth surface. Wherein, the first sub-coverage area is disposed between the first surface and the fourth sub-coverage area, and the fifth sub-coverage area is disposed between the second surface and the second sub-coverage area; or, The fourth sub-coverage area is disposed between the first surface and the first sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area; or, The first sub-coverage area is disposed between the first surface and the fourth sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area; or, The fourth sub-coverage area is disposed between the first surface and the first sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area.

9. The battery cell according to claim 8, characterized in that, The thickness of the first sub-coverage area is equal to the thickness of the second sub-coverage area, and the thickness of the third sub-coverage area is less than the thickness of the first sub-coverage area; The thickness of the fourth sub-coverage area and the thickness of the fifth sub-coverage area, wherein the thickness of the sixth sub-coverage area is less than the thickness of the fourth sub-coverage area.

10. The battery cell according to claim 9, characterized in that, The thicknesses of the first sub-coverage area, the second sub-coverage area, the fourth sub-coverage area, and the fifth sub-coverage area are all equal. The thickness of the third sub-coverage area is equal to the thickness of the sixth sub-coverage area.

11. The battery cell according to claim 6, characterized in that, The thickness of the first insulating film is 0.1-0.5 mm; The thickness of the second insulating film is 0.1-0.5 mm.

12. The battery cell according to claim 7, characterized in that, The thickness of the second support portion and / or the third support portion is 0.2-1 mm.

13. The battery cell according to claim 1, characterized in that, The insulating component has a first through hole on the first surface and a second through hole on the second surface. The first through hole is offset from the second through hole in the height direction of the battery cell.

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