Battery cell, battery, and electrical apparatus

Abstract

A battery cell (10), a battery (1), and an electrical apparatus. In the battery cell (10), an insulating housing (13) comprises a base piece (131), main folding pieces (132), and side folding pieces (133). On a first side (135), transition corners (136) are connected to the main folding pieces (132) by means of first fold lines (1361) and connected to the side folding pieces (133) by means of second fold lines (1362), the base piece (131) is connected to extension folding pieces (134) by means of third fold lines (1341), the third fold lines (1341) are staggered with the straight lines where the first fold lines (1361) are located and / or staggered with the straight lines where the second fold lines (1362) are located when the insulating housing (13) is in an unfolded state, and the extension folding pieces (134) cover gaps between the corresponding side folding pieces (133) and the base piece (131). On this basis, the insulation effect of the insulating housing (13) can be improved.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202420289003.0 filed with the State Intellectual Property Office of the People's Republic of China on February 7, 2024, and with the invention name "Battery Cell, Battery and Electrical Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In some cases, a battery cell includes a housing, a battery cell group housed within the housing, and an insulating shell covering the outer surface of the battery cell group. The insulating shell is used to insulate and isolate the battery cell group from the housing. However, the insulating shell may have gaps at its seams, affecting the insulation effect.

[0005] Application Contents

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which aim to solve the problem that gaps may exist at the joints of an insulating shell, thereby affecting the insulation effect.

[0007] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are:

[0008] In a first aspect, a battery cell is provided, the battery cell comprising:

[0009] shell;

[0010] A battery cell group is housed in the housing, and the battery cell group includes one or more electrode assemblies arranged side by side;

[0011] The insulating shell includes a base sheet, a main folding sheet, and a side folding sheet. The base sheet supports the battery cell group. Two main folding sheets are provided and are respectively provided on opposite sides of the base sheet along a first direction to respectively cover the opposite sides of the battery cell group along the first direction. The insulating shell has a first side along a second direction, and the second direction is perpendicular to the first direction.

[0012] On the first side: at least one main folding piece is connected to a side folding piece via a transition angle, the side folding piece covers the corresponding side of the battery cell group, the transition angle is connected to the main folding piece through a first fold line, and is connected to the side folding piece through a second fold line, the base sheet is connected to an extension folding piece via a third fold line, and the third folding line is misaligned with the straight line where the first folding line is located in the unfolded state of the insulating shell, and / or misaligned with the straight line where the second folding line is located, the extension folding piece is folded to the corresponding side of the battery cell group, and covers the gap between the corresponding side folding piece and the base sheet.

[0013] In the battery cell provided in the embodiments of the present application, the insulating shell can support the cell group via the substrate, and can cover opposite sides of the cell group along the first direction via two main folding pieces provided on opposite sides of the substrate along the first direction. Furthermore, the insulating shell can also cover the corresponding side of the cell group on the first side via at least one main folding piece connected to the main folding piece, and can be folded to the corresponding side of the cell group via an extension folding piece connected to the substrate to cover the gap between the corresponding side folding piece and the substrate, so that the extension folding piece can effectively insulate and isolate the cell group from the shell at the gap between the corresponding side folding piece and the substrate. Based on this, the insulating shell can reliably cover the exterior of the cell group and reliably insulate and isolate the cell group from the shell, thereby improving the insulation effect of the insulating shell between the cell group and the shell, reducing the risk of the cell group contacting the shell through the seam gap of the insulating shell, and reducing the risk of shell corrosion caused by direct contact between the cell group and the shell.

[0014] Furthermore, in this embodiment, on the first side, the third fold line is offset from the line containing at least one of the first and second fold lines when the insulating shell is in the expanded state. This facilitates smooth bending of the extension flap to the corresponding side surface of the cell group, reducing the risk of interference between the extension flap and the corresponding side flap. Furthermore, when the extension flap is bent along the third fold line to the corresponding side surface of the cell group, the extension flap is brought into close proximity with the corresponding side flap, thereby reducing the risk of a large gap between the extension flap and the corresponding side flap. This optimizes the insulation effect of the side flap and the extension flap on the first side, and also optimizes the insulation effect between the insulating shell, the cell group, and the outer shell.

[0015] In some embodiments, the third fold line is located between the straight line where the first fold line is located and the straight line where the second fold line is located when the insulating shell is in the unfolded state.

[0016] By adopting the above solution, by positioning the third fold line between the first fold line and the second fold line when the insulating shell is in the expanded state, the extension flap can be smoothly and seamlessly bent to the corresponding side surface of the cell group, and the risk of interference between the extension flap and the corresponding side flap can be reduced. Furthermore, when the extension flap is bent along the third fold line to the corresponding side surface of the cell group, the extension flap, particularly the corner region between the extension flap and the base sheet, can be brought into close proximity with the corresponding side flap, thereby reducing the risk of gaps or cracks forming between the extension flap (particularly the corner region between the extension flap and the base sheet) and the corresponding side flap. This optimizes the insulation effect of the side flap and the extension flap on the first side, and also optimizes the insulation effect between the insulating shell, the cell group, and the outer shell. This embodiment is particularly suitable for situations where the extension flap is folded outside the corresponding side flap.

[0017] In some embodiments, the extension flaps are folded to the outside of the corresponding side flaps.

[0018] By adopting the above solution, when the side flaps, main flaps, and base sheet cooperate to cover the battery cell group, the extension flaps can be folded to the outside of the corresponding side flaps, so that the gap between the corresponding side flaps and the base sheet can be reliably covered by the extension flaps. Based on this, the bending of the extension flaps can be facilitated, especially the connection and fixation of the side flaps and the extension flaps. The covering effect of the extension flaps on the gap between the side flaps and the base sheet can be visually optimized, and the risk of the extension flaps missing the gap can be reduced. As a result, the folding convenience of the insulating shell can be improved, the structural reliability and stability of the insulating shell in the covering state can be improved, the risk of the insulating shell falling apart can be reduced, and the insulation effect of the insulating shell between the battery cell group and the outer shell can be optimized. In addition, by folding the extension flaps to the outside of the corresponding side flaps, the side flaps can be made to fit and cover the corresponding side of the battery cell group, thereby optimizing the insulation covering effect of the side flaps on the corresponding side of the battery cell group.

[0019] In some embodiments, on the first side, both main folds are connected to side folds via transition angles, and the two side folds jointly cover corresponding sides of the battery cell group.

[0020] By adopting the above solution, when the insulating shell is in the wrapped state, the first side can be bent to the same side of the battery cell group via two side folds connected to the two main folds, and together wrap the corresponding side of the battery cell group. Based on this, on the one hand, the ease of bending the two side folds toward each other and wrapping the same side of the battery cell group can be improved, thereby improving the folding convenience of the insulating shell and the ease of assembling the insulating shell and the battery cell group. On the other hand, the connection gap between the two side folds can be located in the middle of the corresponding side of the battery cell group, which can improve the connection strength between the two side folds, balance the stress on the two side folds during the expansion of the battery cell group, reduce the risk of the two side folds falling apart or being stretched, and enable the two side folds to firmly and securely insulate and wrap the corresponding side of the battery cell group, thereby improving the insulation wrapping effect of the two side folds on the corresponding side of the battery cell group, and optimizing the insulation effect between the insulating shell, the battery cell group and the outer shell.

[0021] In some embodiments, the extension flap is folded to the outside of the two side flaps.

[0022] By adopting the above solution, on the first side, while the two side flaps are jointly covering the corresponding side surfaces of the cell group, the extension flap can be folded outward from the two side flaps, thereby reliably covering the gap between the two side flaps and the base sheet. This facilitates the bending of the extension flap, particularly the connection and fixation of the extension flap to the two side flaps. This allows for visual optimization of the extension flap's covering effect on the gap between the two side flaps and the base sheet, reducing the risk of the extension flap missing coverage of the gap. This improves the folding convenience of the insulating shell, enhances the structural reliability and stability of the insulating shell in the covering state, reduces the risk of the insulating shell falling apart, and optimizes the insulation effect of the insulating shell between the cell group and the outer shell. Furthermore, by folding the extension flap outward from the two side flaps, the two side flaps can reliably, comprehensively, and snugly cover the corresponding side surfaces of the cell group, thereby optimizing the insulation covering effect of the two side flaps on the corresponding side surfaces of the cell group.

[0023] In some embodiments, on the first side, the two side folds are respectively a first side fold and a second side fold, and a portion of the first side fold is folded to the outside of the second side fold.

[0024] By adopting the above solution, when the insulating shell is in the covering state, the first side can cover the corresponding side surface of the battery cell group via the first side folding piece and the second side folding piece whose projections partially overlap along the second direction. Based on this, the first side folding piece can form a pressing effect on the second side folding piece via the portion folded outside the second side folding piece, thereby enhancing the connection strength between the first side folding piece and the second side folding piece, facilitating the maintenance of the shape of the first side folding piece and the second side folding piece during the expansion of the battery cell group, reducing the risk of the first side folding piece and the second side folding piece falling apart or being stretched apart, and enabling the first side folding piece and the second side folding piece to reliably, durably, and comprehensively insulate and cover the corresponding side surface of the battery cell group, thereby optimizing the insulation covering effect of the first side folding piece and the second side folding piece on the corresponding side surface of the battery cell group, and optimizing the insulation effect between the insulating shell, the battery cell group, and the outer shell. Moreover, in the wrapped state of the insulating shell, even if there are processing errors in the dimensions of the battery cell group, the first side fold piece, and the second side fold piece along the first direction, due to the overlapping part of the first side fold piece and the second side fold piece, the first side fold piece and the second side fold piece can be compatible with dimensional deviations within a certain range, and can still fully insulate and wrap the corresponding sides of the battery cell group, thereby improving the dimensional compatibility, applicability and reliability of the insulating shell.

[0025] In some embodiments, a first notch is provided in a portion of the first side flap folded to the outside of the second side flap.

[0026] By adopting the above solution, when the insulating shell is in the wrapped state, on the first side, the portion of the first side flap folded to the outside of the second side flap can pass through the first notch, exposing the corresponding area of ​​the second side flap, so that the adhesive structure (such as tape) can pass through the first notch to reliably and firmly adhere and fix the first side flap to the second side flap. Based on this, the connection convenience, connection reliability and connection strength between the first side flap and the second side flap can be improved, the risk of the first side flap and the second side flap falling apart can be reduced, and the first side flap and the second side flap can be enabled to reliably and durably insulate and cover the corresponding side surfaces of the battery cell group, thereby optimizing the insulation covering effect of the first side flap and the second side flap on the corresponding side surfaces of the battery cell group, and optimizing the insulation effect between the insulating shell, the battery cell group and the outer shell.

[0027] In some embodiments, the extension fold is folded to the outside of the first side fold and the second side fold, or the extension fold is folded between the first side fold and the second side fold; the first notch is provided at one end of the first side fold close to the extension fold, and a portion of the first notch is exposed outside the extension fold.

[0028] By adopting the above solution, when the extension flap is folded outside the first side flap, or folded between the first side flap and the second side flap, the first notch can be provided at one end of the first side flap close to the extension flap, and a portion of the first notch can be exposed outside the extension flap, so that the portion of the first notch exposed outside the extension flap can expose the corresponding area of ​​the second side flap. Based on this, near the first notch, the first side flap, the second side flap, and the extension flap all have exposed portions, which makes it easier for an adhesive structure (such as an adhesive tape) to pass through the first notch and reliably and firmly adhere the first side flap, the second side flap, and the extension flap. In this way, the connection convenience, connection reliability and connection strength of the first side fold sheet, the second side fold sheet and the extension fold sheet can be improved, the risk of the first side fold sheet, the second side fold sheet and the extension fold sheet falling apart can be reduced, and the first side fold sheet, the second side fold sheet and the extension fold sheet can be enabled to reliably and durably insulate and wrap the corresponding sides of the battery cell group, thereby optimizing the insulation wrapping effect of the first side fold sheet, the second side fold sheet and the extension fold sheet, and optimizing the insulation effect of the insulation shell.

[0029] In some embodiments, the first notch is located at a corner of the first side flap close to the extension flap.

[0030] By adopting the above solution, by forming the first notch at the corner of the first side flap near the extension flap, it is possible to facilitate the formation of the first notch by cutting or machining, which facilitates the machining of the first notch and allows for precise control of the size of the first notch. Furthermore, since the first notch is located at the corner, the impact of the machining of the first notch on the structural strength of the first side flap is reduced, reducing the risk of cracking or splitting the first side flap near the first notch, thereby maintaining the insulation coverage and service life of the first side flap.

[0031] In some embodiments, along a direction perpendicular to the third fold line, a dimension of the extended flap ranges from 5 mm to 15 mm.

[0032] By adopting the above scheme, the size range of the extended folding piece is made 5mm to 15mm along the direction perpendicular to the third fold line, so that when the extended folding piece is folded to the corresponding side of the battery cell group, it can reliably cover the gap between the corresponding side folding piece and the base sheet, and the size of the extended folding piece can also be constrained accordingly to reduce the amount of consumables of the adhesive structure (such as tape) used to fix the extended folding piece, and reduce the risk of warping of the extended folding piece after fixation.

[0033] In some embodiments, a second gap is provided between the extension flap and the side flap adjacent thereto.

[0034] By adopting the above solution, by providing a second notch between the extension flap and the adjacent side flap, the extension flap can reduce the pulling effect on the adjacent side flap during folding of the extension flap to the corresponding side of the battery cell group, thereby optimizing the folding convenience and quality of the insulation case and improving the smoothness and precision of the folding of the extension flap and side flap. Furthermore, the provision of the second notch also helps to reduce stress concentration in the area adjacent to the side flap and the extension flap, thereby reducing the risk of deformation or rupture in the area adjacent to the side flap and the extension flap, and optimizing the structural strength and service life of the side flap.

[0035] In some embodiments, at least one corner of the substrate is rounded.

[0036] By adopting the above-mentioned scheme, by making at least one corner of the substrate rounded, the risk of interference between the substrate of the insulating shell and the bottom surface of the battery cell group can be reduced during the assembly of the battery cell group and the insulating shell, and the risk of interference between the corners of the substrate of the insulating shell and the outer shell can be reduced during the assembly of the insulating shell and the outer shell, thereby improving the convenience of assembling the insulating shell with the battery cell group and the outer shell, reducing the risk of damage to the corners of the insulating shell due to friction, impact, shock, etc. during assembly, reducing the risk of damage to the insulating shell during assembly, and improving the performance and service life of the insulating shell.

[0037] In some embodiments, the corners of the base sheet disposed adjacent to the extension flap are rounded;

[0038] Along the first direction, the width of the extension flap is equal to the width of the base sheet minus the dimensions of two corners of the base sheet adjacent to the extension flap.

[0039] By adopting the above solution, along the first direction, the width of the extension flap is equal to: the width of the base sheet minus the dimension of one corner of the base sheet adjacent to the extension flap, minus the dimension of the other corner of the base sheet adjacent to the extension flap; this allows the extension flap to completely cover the gap between the corresponding edge of the base sheet and the corresponding side flap. This optimizes the coverage of the gap between the side flap and the base sheet by the extension flap, reducing the risk of the extension flap missing coverage of the gap. This optimizes the insulation effect of the side flap and the extension flap on the first side, and also optimizes the insulation effect between the insulating shell, the cell assembly, and the outer shell.

[0040] In some embodiments, the extension flap, the corner of the base sheet adjacent thereto, and the side flap adjacent thereto form a second gap.

[0041] By adopting the above solution, building on the previous embodiment, a second notch can be formed by the extension flap, the corner of the base sheet adjacent to the extension flap, and the side flap adjacent to the extension flap. This reduces the pulling effect of the extension flap on the adjacent side flaps during folding of the extension flap to the corresponding side of the cell group, thereby optimizing the folding convenience and quality of the insulating case and improving the smoothness and precision of the folding of the extension flap and side flaps. Furthermore, the second notch can be formed by utilizing the size of the extension flap, the corner of the base sheet, and the side flaps, without requiring material removal. This improves the ease of forming the second notch and optimizes the overall structure of the insulating case. Furthermore, the provision of the second notch also helps to reduce stress concentration in the areas adjacent to the side flaps, base sheet corners, and the extension flap, thereby reducing the risk of deformation or cracking in the areas adjacent to the side flaps, base sheet corners, and the extension flap, and optimizing the structural strength and service life of the insulating case.

[0042] In some embodiments, the first fold line is spaced apart from the corresponding side of the main flap at at least one end of the first fold line in its extension direction.

[0043] By adopting the above solution, by spacing at least one end of the first fold line in its extension direction from the corresponding side of the main flap, the first fold line can be prevented from penetrating the main flap in its extension direction. This ensures a stronger connection strength between the main flap and the transition angle in the area where the first fold line does not extend, maintaining and improving the connection strength, reliability, and durability between the main flap and the transition angle, reducing the risk of cracks, splits, and tears in the connection area between the main flap and the transition angle, and thereby improving the structural reliability and service life of the insulation case.

[0044] In some embodiments, the second fold line is spaced apart from the corresponding side of the side flap at at least one end of the second fold line in its extension direction.

[0045] By adopting the above solution, by spacing at least one end of the second fold line in its extension direction from the corresponding side of the side flap, the second fold line can be prevented from penetrating the side flap in its extension direction. This ensures a stronger connection strength between the side flap and the transition corner in the area where the second fold line does not extend, maintaining and improving the connection strength, reliability, and durability between the side flap and the transition corner, reducing the risk of cracks, splits, and tears in the connection area between the side flap and the transition corner, and thereby improving the structural reliability and service life of the insulation case.

[0046] In some embodiments, the third fold line is spaced apart from a corresponding side of the extension flap at at least one end of the third fold line in its extension direction.

[0047] By adopting the above solution, by spacing at least one end of the third fold line in its extension direction from the corresponding side of the extension flap, the third fold line can be prevented from penetrating the extension flap in its extension direction. This ensures a stronger connection strength between the extension flap and the base flap in the region where the third fold line does not extend, maintaining and improving the connection strength, reliability, and durability between the extension flap and the base flap, and reducing the risk of cracks, splits, and tears in the region where the extension flap and the base flap are connected, thereby improving the structural reliability and service life of the insulation case.

[0048] In some embodiments, the extension flap is a rectangular structure.

[0049] By adopting the above solution, by making the extension flaps rectangular, the shape of the extension flaps can be regularized, resulting in a regular, large surface area, capable of covering a wide area, and reliably covering the gaps between the corresponding side flaps and the base sheet. This optimizes the effect of the extension flaps on the gaps between the side flaps and the base sheet, and reduces the risk of the extension flaps missing gaps. Furthermore, the rectangular extension flaps are easier to process, fold, and install.

[0050] In some embodiments, the transition corners are rounded.

[0051] By adopting the above solution, by making the transition angles rounded, the connected main flaps and side flaps can be connected with rounded corners. Based on this, the stress concentration between the connected main flaps and side flaps can be reduced, and the stress can be evenly distributed in the transition area between the connected main flaps and side flaps, thereby improving the connection strength and connection reliability between the connected main flaps and side flaps, reducing the risk of cracks and splits in the connection area between the main flaps and side flaps, and optimizing the structural strength and service life of the insulation shell. In addition, during the assembly of the battery cell group and the insulation shell, the rounded transition angle can reduce the risk of interference between the edges of the insulation shell and the battery cell group. During the assembly of the insulation shell and the shell, the rounded transition angle can reduce the risk of interference between the edges of the insulation shell and the shell, thereby reducing the risk of damage to the edges of the insulation shell due to friction, impact, shock, etc. during assembly, reducing the risk of damage to the insulation shell during assembly, improving the assembly convenience of the insulation shell with the battery cell group and the shell, and improving the performance and service life of the insulation shell.

[0052] In a second aspect, a battery is provided, which includes the battery cell provided in the embodiments of the present application.

[0053] By adopting the above solution, the battery can improve the reliability and service life of each battery cell by applying the battery cell provided by the embodiment of the present application, thereby improving the reliability and service life of the battery.

[0054] In a third aspect, an electrical device is provided, which includes the battery provided in an embodiment of the present application, or the battery cell provided in an embodiment of the present application.

[0055] By adopting the above solution, the electrical device can improve the reliability and service life of the electrical device by applying the battery or battery cell provided in the embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0057] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0058] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0059] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0060] FIG4 is a schematic structural diagram of an insulating shell in an expanded state provided by some embodiments of the present application;

[0061] FIG5 is a schematic structural diagram of an insulating housing provided by some embodiments of the present application with the extended flaps unfolded;

[0062] FIG6 is a schematic structural diagram of an insulating housing in a finished product state provided by some embodiments of the present application;

[0063] FIG7 is an enlarged view of area A provided in FIG6 ;

[0064] FIG8 is an enlarged view of region B provided in FIG4 .

[0065] Among them, the figure marks are: 1-battery, 2-controller, 3-motor; 100-battery unit, 200-housing, 201-first part, 202-second part; 10-battery monomer, 11-housing, 111-shell, 112-end cover; 12-cell group, 121-electrode assembly, 1211-electrode body, 1212-tab, 1212a-positive tab, 1212b-negative tab; 13-insulating shell, 131-substrate, 132-main folding piece, 1321-fourth folding line, 133-side folding piece, 133a-first side folding piece, 1331-first notch, 133b -Second side fold sheet, 134-extension fold sheet, 1341-third fold line, 1342-second notch, 135-first side, 136-transition angle, 1361-first fold line, 1362-second fold line, 14-insulating member; 15-electrode terminal, 15a-positive electrode terminal, 15b-negative electrode terminal; 16-adapter, 16a-positive electrode adaptor, 16b-negative electrode adaptor; 17-explosion-proof valve; a-first direction, b-second direction, d1-dimension of the extension fold sheet along the direction perpendicular to the third fold line, d2-width of the extension fold sheet along the first direction, d3-width of the substrate along the first direction, d4-dimension of one of the corners of the substrate adjacent to the extension fold sheet along the first direction, d5-dimension of the other corner of the substrate adjacent to the extension fold sheet along the first direction. DETAILED DESCRIPTION

[0066] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the present application is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0067] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0068] 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 technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0070] A battery cell is the smallest unit that stores and outputs electrical energy. In some cases, a battery cell comprises an outer casing, a battery cell group housed within the casing, and an insulating shell covering the outer surface of the battery cell group. The insulating shell is used to insulate and isolate the battery cell group from the outer casing. However, the insulating shell often has gaps at the joints between the circumferential sides and the bottom. This can easily cause contact between the battery cell group and the outer casing, leading to corrosion of the outer casing and compromising the insulating effect of the insulating shell between the battery cell group and the outer casing.

[0071] Thus, an embodiment of the present application provides a battery cell having an insulating shell that supports a cell group via a substrate and covers opposite sides of the cell group along the first direction via two main folding pieces disposed on opposite sides of the substrate along a first direction. Furthermore, the insulating shell can also, on a first side, cover the corresponding side of the cell group via a side fold connected to at least one main folding piece, and fold to the corresponding side of the cell group via an extension fold connected to the substrate to seal the gap between the corresponding side folding piece and the substrate, such that the extension fold effectively insulates and isolates the cell group from the shell at the gap between the corresponding side folding piece and the substrate. Based on this, the insulating shell can reliably cover the exterior of the cell group and reliably insulate and isolate the cell group from the shell, thereby improving the insulation effect of the insulating shell between the cell group and the shell, reducing the risk of the cell group contacting the shell through the seam gap of the insulating shell, and reducing the risk of shell corrosion caused by direct contact between the cell group and the shell.

[0072] Furthermore, in the embodiment of the present application, on the first side, by staggering the third fold line with at least one of the first and second fold lines when the insulating shell is in the expanded state, the extension flap can be smoothly bent to the corresponding side surface of the cell group, and the risk of interference between the extension flap and the corresponding side flap can be reduced. Furthermore, when the extension flap is bent along the third fold line to the corresponding side surface of the cell group, the extension flap can be brought into close proximity with the corresponding side flap, thereby reducing the risk of a large gap between the extension flap and the corresponding side flap. This optimizes the insulation effect of the side flap and the extension flap on the first side, and optimizes the insulation effect between the insulating shell, the cell group, and the outer shell.

[0073] The battery cells disclosed in the embodiments of this application can be lithium-ion secondary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc. The battery cells can be cylindrical, flat, rectangular, or in other shapes. The battery cells can be packaged in various ways, such as cylindrical, prismatic, or soft-pack battery cells.

[0074] The battery cells disclosed in the embodiments of the present application can be used independently or in combination with other battery cells to form modular batteries that can provide higher voltage and capacity, such as battery modules, battery packs or battery packs.

[0075] The battery cells and batteries disclosed in the embodiments of the present application can be used in electrical devices that use the battery cells and batteries as power sources, or in various energy storage systems that use the battery cells and batteries as energy storage elements. The electrical devices may be, but are not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0076] In order to illustrate the technical solution provided by the present application, the following is a detailed description with reference to specific drawings and embodiments, taking "the electrical device being a vehicle" as an example.

[0077] Please refer to Figure 1, which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1 is provided inside the vehicle, and the battery 1 can be provided at the bottom, head or tail of the vehicle. The battery 1 is used to power the vehicle. For example, the battery 1 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2 and a motor 3. The controller 2 is used to control the battery 1 to power the motor 3, for example, for starting, navigating and operating power requirements during driving of the vehicle.

[0078] In some embodiments of the present application, the battery 1 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0079] Please refer to FIG2 , which is an exploded view of a battery 1 provided in some embodiments of the present application. The battery 1 includes a battery cell 100 and a housing 200 , wherein the battery cell 100 is accommodated in the housing 200 .

[0080] The box body 200 is used to provide a storage space for components such as the battery cell 100. The box body 200 can provide dustproof, waterproof and protective protection for the battery cell 100 and other components contained therein, and can reduce the impact of external liquids or other foreign matter on the effectiveness and performance of components such as the battery cell 100, thereby effectively extending the service life of the battery 1.

[0081] The housing 200 can adopt a variety of structures. In some embodiments, the housing 200 can include a first portion 201 and a second portion 202, which cover each other and together define a storage space for accommodating the battery cell 100. The second portion 202 can be a hollow structure with one end open, and the first portion 201 can be a plate-like structure, with the first portion 201 covering the open side of the second portion 202, so that the first portion 201 and the second portion 202 jointly define the storage space. The first portion 201 and the second portion 202 can also be hollow structures with one end open, with the open side of the first portion 201 covering the open side of the second portion 202.

[0082] The box body 200 may be in various shapes, such as a cylinder, a cuboid, etc.

[0083] The box body 200 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0084] Battery cell 100 is an energy storage unit that converts chemical energy into electrical energy. Battery 1 may include one or at least two battery cells 100. When at least two battery cells 100 are provided, the at least two battery cells 100 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations for the at least two battery cells 100.

[0085] Among them, the battery unit 100 can be a battery cell 10 (as shown in Figure 3). At least two battery cells 10 can be directly connected in series, in parallel, or mixed together, and then the whole formed by at least two battery cells 10 is accommodated in the box body 200. Among them, the battery cell 10 can be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The battery cell 10 can be cylindrical, flat, rectangular, or other shapes, etc. The battery cell 10 can be packaged in different ways to form a cylindrical battery cell, a square battery cell, or a soft-pack battery cell, etc.

[0086] Alternatively, the battery unit 100 may be a battery module or battery assembly. At least two battery cells 10 may be connected in series, parallel, or in series to form a modular structure, i.e., a battery module or battery assembly. At least two battery modules or battery assembly may then be connected in series, parallel, or in series to form a whole, which is then housed in the housing 200.

[0087] Of course, the battery 1 may also include other structures. For example, the battery 1 may also include a busbar component (not shown) for achieving electrical connection between at least two battery cells 100. For another example, the battery 1 may also include a power distribution device (not shown) for serving as a control unit for distributing energy of the battery 1 and distributing high voltage to the battery 1.

[0088] Of course, in some embodiments, the battery 1 may not include the box body 200 , but at least two battery cells 10 may be electrically connected and formed into a whole through necessary fixing structures before being assembled into an electrical device.

[0089] Please refer to Figure 3, which is an exploded schematic diagram of a battery cell 10 provided in some embodiments of the present application. A battery cell 10 is the smallest unit for storing and outputting electrical energy. The battery cell 10 includes a housing 11, a cell assembly 12, an insulating shell 13, an insulating member 14, electrode terminals 15, an adapter 16, an explosion-proof valve 17, and an electrolyte (not shown), among other components.

[0090] The outer shell 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The outer shell 11 may include a shell 111 and an end cover 112. The end cover 112 is a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cover 112 can be adapted to the shape of the shell 111 to match the shell 111. In some embodiments, the end cover 112 can be made of a material with a certain hardness and strength, so that the end cover 112 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the reliability performance can also be improved. Among them, the material of the end cover 112 can be diversified, and the end cover 112 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.

[0091] The shell 111 is a component used to cooperate with the end cover 112 to form the internal environment of the battery cell 10. The internal environment formed by the shell 111 and the end cover 112 can be used to accommodate components such as the battery cell group 12, the insulating shell 13, the insulating member 14, and the electrolyte. In some embodiments, the shell 111 and the end cover 112 can be independent components. An opening can be set on the shell 111, and the end cover 112 is made to cover the opening to form the internal environment of the battery cell 10. In some embodiments, the end cover 112 and the shell 111 can also be integrated. Specifically, the end cover 112 and the shell 111 can form a common connection surface before other components are inserted into the shell. When the interior of the shell 111 needs to be encapsulated, the end cover 112 is made to cover the shell 111. Among them, the shell 111 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. The shape of the shell 111 can be determined according to the shape and size of the battery cell group 12. The material of the housing 111 can be varied, and the housing 111 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and other materials.

[0092] The cell group 12 is a component in the battery cell 10 where electrochemical reactions occur. The cell group 12 may include one or at least two electrode assemblies 121. In the case where there are multiple electrode assemblies 121, the multiple electrode assemblies 121 may be arranged side by side. The electrode assembly 121 includes a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure) and a separator (not shown in the figure), which separates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet can be processed by winding, stacking or other methods to form the electrode assembly 121. In the electrode assembly 121, the parts of the positive electrode sheet and the negative electrode sheet that have active materials constitute the electrode body 1211 of the electrode assembly 121, and the parts of the positive electrode sheet and the negative electrode sheet that do not have active materials each constitute a tab 1212. The tab 1212 is the current transmission end of the electrode assembly 121 for transmitting current. The tab 1212 of the positive electrode sheet is the positive electrode tab 1212a, and the tab 1212 of the negative electrode sheet is the negative electrode tab 1212b. The positive electrode tab 1212a and the negative electrode tab 1212b can be located together at one end of the electrode body 1211 or respectively at both ends of the electrode body 1211.

[0093] The insulating shell 13 is a shell-like structure with an open top and insulating properties. The insulating shell 13 is coated on the outside of the battery cell group 12, especially on the part of the battery cell group 12 except the top (that is, it coats the circumferential side and bottom of the battery cell group 12). The insulating shell 13 is made of an insulating material and has insulating properties. The insulating shell 13 is used to insulate and isolate the battery cell group 12 and the outer shell 11 to reduce the risk of outer shell corrosion caused by direct contact between the battery cell group 12 and the outer shell 11. Among them, the insulating shell 13 can be made of an inorganic insulating material, such as silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, etc. The insulating shell 13 can also be made of an organic insulating material, such as polyimide, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, etc.

[0094] The electrolyte is the liquid that soaks the electrode assembly 121. The battery cell 10 mainly relies on the movement of active ions between the positive electrode plate and the negative electrode plate to work. When the battery cell 10 is charged, the positive electrode plate generates active ions. The active ions provided by the positive electrode plate can penetrate the pores of the diaphragm, move to the negative electrode plate through the electrolyte, and embed into the negative active material of the negative electrode plate. Conversely, when the battery cell 10 is discharged, the active ions embedded in the negative active material of the negative electrode plate are released. The active ions released from the negative electrode plate can penetrate the pores of the diaphragm, move to the positive electrode plate through the electrolyte, and embed into the positive active material of the positive electrode plate. Among them, the active ions can be lithium ions, sodium ions, etc.

[0095] The electrode terminal 15 is a component that is electrically connected to the electrode assembly 121 and is used to output or input electrical energy. The electrode terminal 15 includes a positive electrode terminal 15a and a negative electrode terminal 15b. The positive electrode terminal 15a is electrically connected to the positive electrode tab 1212a of the electrode assembly 121. The negative electrode terminal 15b is electrically connected to the negative electrode tab 1212b of the electrode assembly 121. The electrode terminal 15 can be mounted on the housing 11 and stabilize the mounting position and mounting state relative to the housing 11. In some embodiments, the electrode terminal 15 can be mounted on the housing 11 by flanging and riveting.

[0096] The adapter 16 is a current collecting component electrically connected between the electrode tab 1212 of the electrode assembly 121 and the corresponding electrode terminal 15. The adapter 16 may also be referred to as a adapter connector, a current collecting plate, or an adapter plate. The adapter 16 has conductive properties and is made of a conductive material. The material of the adapter 16 may include aluminum, aluminum alloy, copper, copper alloy, copper-aluminum alloy, etc. The adapter 16 includes a positive electrode adapter 16a and a negative electrode adapter 16b. The positive electrode tab 1212a of the electrode assembly 121 can be electrically connected to the positive electrode terminal 15a via the positive electrode adapter 16a, and the negative electrode tab 1212b of the electrode assembly 121 can be electrically connected to the negative electrode terminal 15b via the negative electrode adapter 16b to form a current loop. In some embodiments, the adapter 16 can be connected to the electrode tab 1212 of the electrode assembly 121 by welding, abutting, or the like. The adapter 16 can be connected to the electrode terminal 15 by welding, abutting, or the like. The shape of the adapter 16 can be various, such as square, round, special-shaped, etc.

[0097] The insulating member 14 is a component with insulating properties. The insulating member 14 is arranged in the outer shell 11, in particular, between the electrode assembly 121 and the wall portion of the outer shell 11 having the electrode terminal 15 (such as the end cover 112). On the basis that the tab 1212 of the electrode assembly 121 and the corresponding electrode terminal 15 can be electrically connected, the insulating member 14 can be used to insulate and isolate the electrode assembly 121 and the wall portion of the outer shell 11 having the electrode terminal 15 to reduce the risk of short circuit, current leakage and the like. In addition, the insulating member 14 can also be fixed to the wall portion of the outer shell 11 having the electrode terminal 15, and abut the electrode assembly 121 to fill the gap between the electrode assembly 121 and the wall portion of the outer shell 11, and tightly fix the electrode assembly 121, thereby ensuring to a certain extent that the electrode assembly 121 will not move or shake relatively during the use of the battery cell 10, which is beneficial to maintaining the structural integrity of the battery cell 10 and reducing the risk of loosening or deformation of the electrode assembly 121.

[0098] In some embodiments, an explosion-proof valve 17 may also be provided on the housing 11. The explosion-proof valve 17 is used to release the internal pressure of the battery cell 10 when the internal pressure (or temperature) reaches a threshold. Correspondingly, an opening (not shown) is provided on the insulating member 14 at the position corresponding to the explosion-proof valve 17. The opening connects the side of the insulating member 14 near the electrode assembly 121 and the side of the insulating member 14 near the explosion-proof valve 17. When the internal pressure (or temperature) of the battery cell 10 reaches the threshold, at least some gas is allowed to flow through the opening to the explosion-proof valve 17 and be discharged through the explosion-proof valve 17.

[0099] Referring to Figures 3, 4, 5, and 6, some embodiments of the present application provide a battery cell 10, which includes an outer shell 11, a battery cell group 12, and an insulating shell 13. The battery cell group 12 is accommodated in the outer shell 11. The battery cell group 12 includes one or more electrode assemblies 121 arranged side by side. The insulating shell 13 includes a base sheet 131, a main folding sheet 132, and a side folding sheet 133. The base sheet 131 supports the battery cell group 12. There are two main folding sheets 132, which are respectively arranged on opposite sides of the base sheet 131 along the first direction a to respectively cover the opposite sides of the battery cell group 12 along the first direction a. The insulating shell 13 has a first side 135 along the second direction b, and the second direction b is perpendicular to the first direction a.

[0100] On the first side 135: at least one main folding piece 132 is connected to the side folding piece 133 via a transition angle 136, and the side folding piece 133 covers the corresponding side of the battery cell group 12. The transition angle 136 is connected to the main folding piece 132 via a first fold line 1361, and is connected to the side folding piece 133 via a second fold line 1362. The base sheet 131 is connected to the extension folding piece 134 via a third fold line 1341. When the insulating shell 13 is unfolded, the third folding line 1341 is offset from the straight line where the first folding line 1361 is located, and / or is offset from the straight line where the second folding line 1362 is located. The extension folding piece 134 is folded to the corresponding side of the battery cell group 12 and covers the gap between the corresponding side folding piece 133 and the base sheet 131.

[0101] It should be noted that the housing 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. In addition, other related descriptions of the housing 11 can be found in the above text and will not be repeated here.

[0102] The cell assembly 12 is the component within the battery cell 10 where the electrochemical reaction occurs. The cell assembly 12 may include one or at least two electrode assemblies 121. If multiple electrode assemblies 121 are provided, they may be arranged side by side. The cell assembly 12 may be housed within the housing 11. For further details regarding the cell assembly 12, please refer to the previous section and will not be repeated here.

[0103] It should also be noted that the insulating shell 13 can be folded from an unfolded state to a covered state. The insulating shell 13 is in a covered state within the battery cell 10. In the covered state, the insulating shell 13 forms a shell-like structure that matches the outer shape of the battery cell group 12. The top of the insulating shell 13 is open and can cover the exterior of the battery cell group 12, particularly covering the exterior of the battery cell group 12 excluding the top (i.e., covering the circumferential sides and bottom of the battery cell group 12).

[0104] The insulating shell 13 is made of an insulating material with excellent insulation properties. It serves to insulate and isolate the cell group 12 from the outer casing 11, reducing the risk of corrosion of the outer casing 11 caused by direct contact between the cell group 12 and the outer casing 11. The insulating shell 13 can be made of inorganic insulating materials such as silicon oxide, silicon nitride, aluminum oxide, and aluminum nitride. Alternatively, the insulating shell 13 can be made of organic insulating materials such as polyimide, polyethylene, polyvinylidene fluoride, and polytetrafluoroethylene.

[0105] It should also be noted that the insulating shell 13 includes a base sheet 131 , a main folding sheet 132 , and a side folding sheet 133 .

[0106] The substrate 131 is provided with a . In the wrapped state of the insulating shell 13, the substrate 131 is wrapped around the bottom of the battery cell group 12 and supports the battery cell group 12. In some embodiments, the substrate 131 can be a rectangular structure that matches the bottom of the battery cell group 12.

[0107] There are two main folding pieces 132. The two main folding pieces 132 are respectively arranged on opposite sides of the base sheet 131 along the first direction a. Each main folding piece 132 can be integrally connected to the base sheet 131, and each main folding piece 132 can be connected to the base sheet 131 through a fourth fold line 1321. The fourth fold line 1321 can be a marking line, a weakening mark, a dotted printed line, etc. printed on the insulating shell 13. In the wrapped state of the insulating shell 13, each main folding piece 132 is bent about 90° relative to the base sheet 131 along the fourth fold line 1321, and covers the corresponding side surface of the battery cell group 12 along the first direction a, that is, the two main folding pieces 132 respectively cover the opposite sides of the battery cell group 12 along the first direction a. In some embodiments, the main folding piece 132 can be a rectangular structure that matches the corresponding side surface of the battery cell group 12.

[0108] Along a second direction b perpendicular to the first direction a, the insulating shell 13 may have a first side 135. Specifically, one side of the insulating shell 13 along the second direction b may be the first side 135, i.e., only one side of the insulating shell 13 along the second direction b employs the relevant design described in this application, while the other side may employ other designs to cover the corresponding side of the battery cell assembly 12 along the second direction b. Alternatively, both opposing sides of the insulating shell 13 along the second direction b may be the first side 135, i.e., both opposing sides of the insulating shell 13 along the second direction b employ the relevant design described in this application.

[0109] It should also be noted that on the first side 135, at least one main folding piece 132 is connected to a side folding piece 133 corresponding to the side of the first side 135, and the connected main folding pieces 132 and side folding pieces 133 can be integrally connected. In some embodiments, one main folding piece 132 can be connected to the side folding piece 133 via a transition angle 136, that is, one side folding piece 133 is provided on the first side 135. In this case, when the insulating shell 13 is wrapped around the battery cell group 12, the dimension of the side folding piece 133 along the first direction a is greater than or equal to the dimension of the battery cell group 12 along the first direction a, so that the side folding piece 133 can be bent relative to the main folding piece 132 to the corresponding side of the battery cell group 12 (i.e., the side corresponding to the first side 135) and wrap the corresponding side of the battery cell group 12. In other embodiments, both main folding pieces 132 may be connected to side folding pieces 133 via transition angles 136, i.e., two side folding pieces 133 are provided on the first side 135. In this case, when the insulating shell 13 is wrapped around the battery cell group 12, the sum of the dimensions of the two side folding pieces 133 along the first direction a is greater than or equal to the dimension of the battery cell group 12 along the first direction a, so that the two side folding pieces 133 can be bent relative to the main folding piece 132 to the same side of the battery cell group 12 and jointly wrap the corresponding side of the battery cell group 12. The shape of the side folding pieces 133 can be variously designed, such as rectangular.

[0110] The connected main folding piece 132 and the side folding piece 133 are transitionally connected via a transition angle 136. Each transition angle 136 is connected to the main folding piece 132 via a first fold line 1361, and each transition angle 136 is connected to the side folding piece 133 via a second fold line 1362. The first fold line 1361 and the second fold line 1362 can be marking lines, weakening marks, dotted printed lines, etc. printed on the insulating shell 13. In the wrapped state of the insulating shell 13, each transition angle 136 is bent along the first fold line 1361 relative to the main folding piece 132, and the side folding piece 133 connected to the transition angle 136 is bent along the second folding piece relative to the transition angle 136, so that the side folding piece 133 is bent to the corresponding side of the battery cell group 12 relative to the main folding piece 132. The transition angle 136 can be a rounded corner or a chamfered corner.

[0111] It should also be noted that an extension flap 134 is connected to the side of the base sheet 131 corresponding to the first side 135 on the first side 135. The extension flap 134 and the base sheet 131 can be integrally connected. The extension flap 134 and the base sheet 131 are connected by a third fold line 1341. The third fold line 1341 can be a marking line, a weakened mark, a dotted printed line, etc. printed on the insulating shell 13.

[0112] In the wrapped state of the insulating shell 13, the extended folding piece 134 can be bent along the third folding line 1341 relative to the base sheet 131 to the corresponding side surface of the battery cell group 12, and mainly covers the corner area of ​​the corresponding side surface and bottom surface of the battery cell group 12, and covers the gap between the corresponding side folding piece 133 and the base sheet 131, so that the battery cell group 12 and the outer shell 11 can be insulated and isolated by the extended folding piece 134 at the gap between the corresponding side folding piece 133 and the base sheet 131, thereby improving the insulation effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11.

[0113] In the case where one side fold piece 133 is provided on the first side 135, the extension fold piece 134 can be folded to the outside of the side fold piece 133 or to the inside of the side fold piece 133. In the case where two side fold pieces 133 are provided on the first side 135, the extension fold piece 134 can be folded to the outside of the two side fold pieces 133, to between the two side fold pieces 133, or to the inside of the two side fold pieces 133.

[0114] It should also be noted that the expanded state of the insulating shell 13 is the state before the insulating shell 13 is folded and transformed into the covering state. The insulating shell 13 is laid flat in the expanded state.

[0115] In some embodiments, when the insulation shell 13 is in the unfolded state, on the first side 135 , the third fold line 1341 is offset from the straight line where the first fold line 1361 is located, and is also offset from the straight line where the second fold line 1362 is located.

[0116] In other embodiments, when the insulation shell 13 is in the unfolded state, on the first side 135 , the third fold line 1341 is offset from the straight line where the first fold line 1361 is located, or is offset from the straight line where the second fold line 1362 is located.

[0117] Since the area from the first fold line 1361 to the second fold line 1362 is mainly used to form the outer surface of the transition angle 136 (such as the rounded arc surface, the chamfered slope, etc.), by making the third fold line 1341 in the unfolded state of the insulating shell 13 staggered with the straight line where at least one of the first fold line 1361 and the second fold line 1362 is located, it is convenient for the extended fold sheet 134 to be smoothly bent to the corresponding side surface of the battery cell group 12, and the risk of mutual interference between the extended fold sheet 134 and the corresponding side fold sheet 133 can be reduced. Moreover, when the extension fold 134 is bent along the third fold line 1341 to the corresponding side of the battery cell group 12, the extension fold 134 can be brought close to the corresponding side fold 133, thereby reducing the risk of a large gap between the extension fold 134 and the corresponding side fold 133, optimizing the insulation effect of the side fold 133 and the extension fold 134 on the first side 135, and optimizing the insulation effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11.

[0118] In summary, in the battery cell 10 provided in the embodiment of the present application, the insulating shell 13 can support the cell group 12 via the base sheet 131, and can respectively cover the two opposite sides of the cell group 12 along the first direction a via two main folding pieces 132 disposed on opposite sides of the base sheet 131 along the first direction a. Furthermore, the insulating shell 13 can also cover the corresponding sides of the cell group 12 on the first side 135 via side folding pieces 133 connected to at least one main folding piece 132, and can fold to the corresponding sides of the cell group 12 via extension folding pieces 134 connected to the base sheet 131 to cover the gap between the corresponding side folding piece 133 and the base sheet 131. This allows the extension folding piece 134 to effectively insulate and isolate the cell group 12 from the outer shell 11 at the gap between the corresponding side folding piece 133 and the base sheet 131. Based on this, the insulating shell 13 can be relatively comprehensive and reliable, which can reliably cover the outside of the battery cell group 12 and reliably insulate and isolate the battery cell group 12 and the outer shell 11, thereby improving the insulation effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11, reducing the risk of the battery cell group 12 contacting the outer shell 11 through the seams and gaps of the insulating shell 13, and reducing the risk of corrosion of the outer shell 11 due to direct contact between the battery cell group 12 and the outer shell 11.

[0119] Furthermore, in this embodiment, on the first side 135, by staggering the third fold line 1341 with respect to at least one of the first fold line 1361 and the second fold line 1362 when the insulating shell 13 is in the unfolded state, the extension flap 134 can be smoothly bent to the corresponding side surface of the cell group 12, thereby reducing the risk of interference between the extension flap 134 and the corresponding side flap 133. Furthermore, when the extension flap 134 is bent along the third fold line 1341 to the corresponding side surface of the cell group 12, the extension flap 134 can be brought into close proximity with the corresponding side flap 133, thereby reducing the risk of a large gap between the extension flap 134 and the corresponding side flap 133. This optimizes the insulation effect of the side flap 133 and the extension flap 134 on the first side 135, and also optimizes the insulation effect of the insulating shell 13 between the cell group 12 and the outer shell 11.

[0120] Referring to FIG. 3 , FIG. 4 , and FIG. 5 , in some embodiments of the present application, the third fold line 1341 is located between the straight line where the first fold line 1361 is located and the straight line where the second fold line 1362 is located when the insulation shell 13 is in the unfolded state.

[0121] It should be noted that, in the unfolded state of the insulating shell 13, on the first side 135, since the area from the first fold line 1361 to the second fold line 1362 is mainly used to form the outer surface of the transition angle 136 (such as a rounded arc surface, a chamfered slope, etc.), the third fold line 1341 is between the straight line where the first fold line 1361 is located and the straight line where the second fold line 1362 is located.

[0122] By adopting the above solution, by making the third fold line 1341 between the straight line where the first fold line 1361 and the straight line where the second fold line 1362 are located in the unfolded state of the insulating shell 13, the extended fold sheet 134 can be smoothly and smoothly bent to the corresponding side of the battery cell group 12, and the risk of interference between the extended fold sheet 134 and the corresponding side fold sheet 133 can be reduced. Furthermore, when the extension flap 134 is bent along the third fold line 1341 to the corresponding side surface of the cell group 12, the extension flap 134, especially the corner region between the extension flap 134 and the base sheet 131, can be brought into close proximity with the corresponding side flap 133. This reduces the risk of a gap or crack forming between the extension flap 134 (especially the corner region between the extension flap 134 and the base sheet 131) and the corresponding side flap 133, thereby optimizing the insulation effect of the side flap 133 and the extension flap 134 on the first side 135 and optimizing the insulation effect of the insulating shell 13 between the cell group 12 and the outer shell 11. This embodiment is particularly suitable for the situation where the extension flap 134 is folded to the outside of the corresponding side flap 133.

[0123] Please refer to FIG. 3 , FIG. 5 , and FIG. 6 . In some embodiments of the present application, the extension flap 134 is folded to the outside of the corresponding side flap 133 .

[0124] It should be noted that, when one side fold 133 is provided on the first side 135, the extension fold 134 can be folded to the outside of the side fold 133. When two side folds 133 are provided on the first side 135, the extension fold 134 can be folded to the outside of the two side folds 133.

[0125] By adopting the above solution, when the side flaps 133, main flap 132, and base sheet 131 cooperate to cover the battery cell assembly 12, the extension flap 134 can be folded to the outside of the corresponding side flap 133, so that the extension flap 134 can reliably cover the gap between the corresponding side flap 133 and the base sheet 131. Based on this, the bending of the extension flap 134 is facilitated, especially the connection and fixation between the side flap 133 and the extension flap 134. The covering effect of the extension flap 134 on the gap between the side flap 133 and the base sheet 131 can be visually optimized, and the risk of the extension flap 134 missing the gap can be reduced. As a result, the folding convenience of the insulating shell 13 is improved, the structural reliability and stability of the insulating shell 13 in the covering state can be improved, the risk of the insulating shell 133 falling apart can be reduced, and the insulation effect of the insulating shell 13 between the battery cell assembly 12 and the outer shell 11 can be optimized. Furthermore, by folding the extension flaps 134 to the outside of the corresponding side flaps 133 , the side flaps 133 can be fitted and wrapped around the corresponding side surfaces of the cell group 12 , thereby optimizing the insulation coverage of the side flaps 133 on the corresponding side surfaces of the cell group 12 .

[0126] Of course, in other embodiments, when one side fold 133 is provided on the first side 135, the extension fold 134 can be folded to the inside of the side fold 133. When two side folds 133 are provided on the first side 135, the extension fold 134 can be folded between the two side folds 133 or to the inside of the two side folds 133.

[0127] Please refer to Figures 3, 4, 5 and 6. In some embodiments of the present application, on the first side 135, the two main folds 132 are connected to the side folds 133 via the transition angle 136. The two side folds 133 jointly cover the corresponding sides of the battery cell group 12.

[0128] It should be noted that on the first side 135, both main flaps 132 are connected to side flaps 133 via transition angles 136. That is, two side flaps 133 are provided on the first side 135. When the insulating shell 13 is wrapped around the battery cell assembly 12, the sum of the dimensions of the two side flaps 133 along the first direction a is greater than or equal to the dimension of the battery cell assembly 12 along the first direction a. This arrangement allows the two side flaps 133 to bend relative to the main flaps 132 to the same side of the battery cell assembly 12, thereby jointly wrapping the corresponding side of the battery cell assembly 12.

[0129] By adopting the above solution, when the insulating case 13 is in the covered state, the first side 135 can be bent to the same side of the battery cell group 12 via the two side folding pieces 133 respectively connected to the two main folding pieces 132, and together cover the corresponding side of the battery cell group 12. Based on this, on the one hand, the operation convenience of bending the two side folding pieces 133 toward each other to cover the same side of the battery cell group 12 can be improved, thereby improving the folding convenience of the insulating case 13 and improving the assembly convenience of the insulating case 13 and the battery cell group 12. On the one hand, the connection gap between the two side folding pieces 133 can be located in the middle of the corresponding side of the battery cell group 12, which can improve the connection strength between the two side folding pieces 133, balance the stress conditions of the two side folding pieces 133 during the expansion of the battery cell group 12, reduce the risk of the two side folding pieces 133 falling apart or being stretched, and enable the two side folding pieces 133 to firmly and firmly insulate and cover the corresponding side of the battery cell group 12, thereby improving the insulation covering effect of the two side folding pieces 133 on the corresponding side of the battery cell group 12, and optimizing the insulation effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11.

[0130] Of course, in other embodiments, a main folding piece 132 may be connected to a side folding piece 133 via a transition angle 136 on the side corresponding to the first side 135, that is, a side folding piece 133 is provided on the first side 135, and in the wrapped state of the insulating shell 13, the size of the side folding piece 133 along the first direction a is greater than or equal to the size of the battery cell group 12 along the first direction a, so that the side folding piece 133 can be bent to the corresponding side of the battery cell group 12 relative to the main folding piece 132 and wrap the corresponding side of the battery cell group 12.

[0131] Please refer to FIG. 3 , FIG. 5 , and FIG. 6 . In some embodiments of the present application, the extension flap 134 is folded to the outside of the two side flaps 133 .

[0132] It should be noted that, when two side folds 133 are provided on the first side 135 , the extension fold 134 can be folded to the outside of the two side folds 133 .

[0133] By adopting the above solution, on the first side 135, while the two side folds 133 are jointly covering the corresponding side surfaces of the battery cell assembly 12, the extension fold 134 can be folded outward from the two side folds 133, so that the extension fold 134 can reliably cover the gap between the two side folds 133 and the base sheet 131. This facilitates the bending of the extension fold 134, and particularly facilitates the connection and fixation of the extension fold 134 to the two side folds 133. This allows for visual optimization of the extension fold 134's covering effect on the gap between the two side folds 133 and the base sheet 131, reducing the risk of the extension fold 134 missing coverage of the gap. This improves the folding convenience of the insulating shell 13, enhances the structural reliability and stability of the insulating shell 13 in the covering state, reduces the risk of the insulating shell 133 falling apart, and optimizes the insulating effect of the insulating shell 133 between the battery cell assembly 12 and the outer shell 11. In addition, by folding the extension flap 134 to the outside of the two side flaps 133, the two side flaps 133 can reliably, comprehensively and snugly cover the corresponding sides of the battery cell group 12, thereby optimizing the insulation covering effect of the two side flaps 133 on the corresponding sides of the battery cell group 12.

[0134] Of course, in other embodiments, the extension flap 134 can be folded between the two side flaps 133 , or folded to the inner sides of the two side flaps 133 .

[0135] Please refer to Figures 3, 5 and 6. In some embodiments of the present application, on the first side 135, the two side folds 133 are respectively a first side fold 133a and a second side fold 133b, and a portion of the first side fold 133a is folded to the outside of the second side fold 133b.

[0136] It should be noted that when two side folds 133 are provided on the first side 135, the second side fold 133b can be first bent to the corresponding side of the cell group 12, and then the first side fold 133a can be bent to the same side of the cell group 12, with the first side fold 133a partially covering the outside of the second side fold 133b. That is, when the insulating shell 13 is wrapped, along the second direction b, on the first side 135, the projections of the first side fold 133a and the second side fold 133b overlap.

[0137] By adopting the above solution, in the wrapped state of the insulating shell 13 , the first side 135 can cover the corresponding side surface of the battery cell group 12 via the first side folding piece 133 a and the second side folding piece 133 b that partially overlap in projection along the second direction b. Based on this, the first side fold piece 133a can form a pressing effect on the second side fold piece 133b through the part folded to the outside of the second side fold piece 133b, thereby enhancing the connection strength between the first side fold piece 133a and the second side fold piece 133b, which can be beneficial to maintaining the shape of the first side fold piece 133a and the second side fold piece 133b during the expansion of the battery cell group 12, and reducing the risk of the first side fold piece 133a and the second side fold piece 133b falling apart and being stretched, and can enable the first side fold piece 133a and the second side fold piece 133b to reliably, durably and comprehensively insulate and cover the corresponding sides of the battery cell group 12, thereby optimizing the insulating covering effect of the first side fold piece 133a and the second side fold piece 133b on the corresponding sides of the battery cell group 12, and optimizing the insulating effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11. Moreover, in the wrapped state of the insulating shell 13, even if there are processing errors in the dimensions of the battery cell group 12, the first side fold piece 133a, and the second side fold piece 133b along the first direction a, due to the overlapping part of the first side fold piece 133a and the second side fold piece 133b, the first side fold piece 133a and the second side fold piece 133b can be compatible with dimensional deviations within a certain range, and can still fully insulate and wrap the corresponding sides of the battery cell group 12, thereby improving the dimensional compatibility, applicability and reliability of the insulating shell 13.

[0138] Of course, in other embodiments, in the wrapped state of the insulating shell 13, the sum of the dimensions of the first side fold piece 133a and the second side fold piece 133b along the first direction a is equal to the dimension of the battery cell group 12 along the first direction a, so that the first side fold piece 133a and the second side fold piece 133b are exactly adjacent to each other and jointly wrap the corresponding side surfaces of the battery cell group 12.

[0139] Please refer to FIG. 3 , FIG. 4 , and FIG. 5 . In some embodiments of the present application, a first notch 1331 is defined in the portion of the first side flap 133 a folded to the outside of the second side flap 133 b .

[0140] It should be noted that the first side flap 133a is provided with a first notch 1331. The first notch 1331 is located at the portion of the first side flap 133a that is folded outside the second side flap 133b, such that the first notch 1331 exposes a corresponding area of ​​the second side flap 133b. The first notch 1331 can be designed in a variety of shapes, including, but not limited to, a triangle, a rectangle, and the like.

[0141] By adopting the above solution, in the wrapped state of the insulating shell 13, on the first side 135, the part of the first side fold 133a folded to the outside of the second side fold 133b can be exposed through the first notch 1331 to the corresponding area of ​​the second side fold 133b, so that the bonding structure (such as tape) can pass through the first notch 1331 to reliably and firmly bond and fix the first side fold 133a and the second side fold 133b. Based on this, the connection convenience, connection reliability and connection strength between the first side fold piece 133a and the second side fold piece 133b can be improved, the risk of the first side fold piece 133a and the second side fold piece 133b falling apart can be reduced, and the first side fold piece 133a and the second side fold piece 133b can be enabled to reliably and durably insulate and wrap the corresponding sides of the battery cell group 12, thereby optimizing the insulating wrapping effect of the first side fold piece 133a and the second side fold piece 133b on the corresponding sides of the battery cell group 12, and optimizing the insulating effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11.

[0142] Of course, in other embodiments, the first side fold 133a and the second side fold 133b may be fixed along other positions such as the edge of the first side fold 133a or the overlapping position of the first side fold 133a and the second side fold 133b.

[0143] Referring to Figures 4, 5, 6, and 7, in some embodiments of the present application, the extension flap 134 is folded outside the first side flap 133a and the second side flap 133b, or folded between the first side flap 133a and the second side flap 133b. A first notch 1331 is provided at one end of the first side flap 133a that is close to the extension flap 134, with a portion of the first notch 1331 exposed outside the extension flap 134.

[0144] It should be noted that, when the extension fold 134 is folded outside the first side fold 133a, or the extension fold 134 is folded between the first side fold 133a and the second side fold 133b, the first notch 1331 can be set at one end of the first side fold 133a close to the extension fold 134, and partially exceed and expose outside the extension fold 134, so that near the first notch 1331, the first side fold 133a, the second side fold 133b and the extension fold 134 all have exposed parts.

[0145] By adopting the above solution, when the extension flap 134 is folded outside the first side flap 133a, or folded between the first side flap 133a and the second side flap 133b, the first notch 1331 can be provided at one end of the first side flap 133a close to the extension flap 134, and a portion of the first notch 1331 can be exposed outside the extension flap 134, so that the portion of the first notch 1331 exposed outside the extension flap 134 can expose the corresponding area of ​​the second side flap 133b. Based on this, near the first notch 1331, the first side flap 133a, the second side flap 133b, and the extension flap 134 all have exposed portions, which makes it easier for an adhesive structure (such as an adhesive tape) to pass through the first notch 1331 and reliably and firmly adhere and fix the first side flap 133a, the second side flap 133b, and the extension flap 134. In this way, the connection convenience, connection reliability and connection strength of the first side fold piece 133a, the second side fold piece 133b and the extension fold piece 134 can be improved, the risk of the first side fold piece 133a, the second side fold piece 133b and the extension fold piece 134 falling apart can be reduced, and the first side fold piece 133a, the second side fold piece 133b and the extension fold piece 134 can be enabled to reliably and durably insulate and wrap the corresponding sides of the battery cell group 12 (as shown in Figure 3), thereby optimizing the insulation wrapping effect of the first side fold piece 133a, the second side fold piece 133b and the extension fold piece 134, and optimizing the insulation effect of the insulation shell 13.

[0146] Of course, in other embodiments, when the first notch 1331 is provided in the portion where the first side fold 133a is folded to the outside of the second side fold 133b, the first notch 1331 may be provided in other areas, such as the middle area of ​​the first side fold 133a in a direction perpendicular to the first direction a and the second direction b.

[0147] Please refer to FIG. 5 , FIG. 6 , and FIG. 7 . In some embodiments of the present application, the first notch 1331 is disposed at a corner of the first side flap 133 a close to the extension flap 134 .

[0148] It should be noted that since the first notch 1331 is provided at the portion where the first side fold 133a is folded outside the second side fold 133b, the first notch 1331 is provided at the corner of the first side fold 133a close to the second side fold 133b and the extension fold 134. The first notch 1331 may be, but is not limited to, triangular in shape.

[0149] By adopting the above solution, by forming the first notch 1331 at the corner of the first side flap 133a near the extension flap 134, it is possible to facilitate the formation of the first notch 1331 by cutting or machining, which facilitates the machining of the first notch 1331 and allows for precise control of the size of the first notch 1331. Furthermore, since the first notch 1331 is located at the corner, the effect of machining the first notch 1331 on the structural strength of the first side flap 133a is reduced, reducing the risk of cracks or splits in the first side flap 133a near the first notch 1331, thereby maintaining the insulation and coating properties and service life of the first side flap 133a.

[0150] Of course, in other embodiments, when the first notch 1331 is provided at the portion of the first side fold 133a folded to the outside of the second side fold 133b, the first notch 1331 may be provided at a non-corner region of the first side fold 133a.

[0151] Please refer to FIG. 4 . In some embodiments of the present application, along a direction perpendicular to the third fold line 1341 , a dimension d1 of the extended flap 134 ranges from 5 mm to 15 mm.

[0152] It should be noted that the dimension d1 of the extension flap 134 along a direction perpendicular to the third fold line 1341 may correspond to the dimension of the extension flap 134 along a direction perpendicular to the first direction a and the second direction b when the insulating shell 13 is enclosed; and may correspond to the dimension of the extension flap 134 along the second direction b when the insulating shell 13 is unfolded. The dimension d1 of the extension flap 134 along a direction perpendicular to the third fold line 1341 ranges from 5 mm to 15 mm, and may be, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, and so on.

[0153] By adopting the above solution, the size d1 of the extension fold 134 is adjusted to a range of 5 mm to 15 mm along a direction perpendicular to the third fold line 1341. This allows the extension fold 134 to reliably cover the gap between the corresponding side fold 133 and the base sheet 131 when it is folded to the corresponding side of the battery cell group 12. The size of the extension fold 134 can also be constrained accordingly to reduce the amount of consumables of the adhesive structure (such as tape) used to fix the extension fold 134, and reduce the risk of warping of the extension fold 134 after it is fixed.

[0154] Of course, in other embodiments, since the extended folding piece 134 can cover the gap between the corresponding side folding piece 133 and the base sheet 131 when it is folded to the corresponding side of the battery cell group 12, the dimension d1 of the extended folding piece 134 along the direction perpendicular to the third folding line 1341 can be set to be greater than 0 and less than 5 mm, or can be set to be greater than 15 mm and less than the dimension of the battery cell group 12 along the direction perpendicular to the first direction a and the second direction b.

[0155] Please refer to Figures 3, 4, 5 and 8. In some embodiments of the present application, a second notch 1342 is defined between the extension flap 134 and the adjacent side flap 133.

[0156] It should be noted that when a single side flap 133 is provided on the first side 135, a second notch 1342 is provided between the extension flap 134 and the adjacent side flap 133. When two side flaps 133 are provided on the first side 135, a second notch 1342 is provided between the extension flap 134 and each of the two adjacent side flaps 133. That is, a second notch 1342 is provided on each of the two opposite sides of the extension flap 134 along the first direction a, meaning that the extension flap 134 corresponds to two second notches 1342. The second notches 1342 can be designed in various shapes, including, but not limited to, triangular, rectangular, and the like.

[0157] By adopting the above solution, by providing a second notch 1342 between the extension flap 134 and the adjacent side flap 133, the pulling effect of the extension flap 134 on the adjacent side flap 133 can be reduced during the period when the extension flap 134 is folded to the corresponding side surface of the battery cell group 12, thereby optimizing the folding convenience and folding quality of the insulating shell 13 and improving the smoothness and precision of the folding of the extension flap 134 and the side flap 133. In addition, the provision of the second notch 1342 also helps to alleviate stress concentration in the area adjacent to the side flap 133 and the extension flap 134, thereby reducing the risk of deformation or rupture in the area adjacent to the side flap 133 and the extension flap 134, and optimizing the structural strength and service life of the side flap 133.

[0158] Of course, in other embodiments, the extension flap 134 and the adjacent side flap 133 may be separated from each other via a cut seam, and the second notch 1342 may be omitted.

[0159] Please refer to FIG. 3 , FIG. 4 , and FIG. 6 . In some embodiments of the present application, at least one corner of the substrate 131 is rounded.

[0160] It should be noted that, since the substrate 131 covers the bottom of the cell group 12 and supports the cell group 12 when enclosed by the insulating shell 13, the shape and size of the substrate 131 generally correspond to the shape and size of the bottom of the cell group 12. The substrate 131 may be, but is not limited to, a polygonal shape such as a rectangle, and may have corners. At least one corner of the substrate 131 may be rounded. In some embodiments, all corners of the substrate 131 may be rounded.

[0161] By adopting the above-mentioned scheme, by making at least one corner of the substrate 131 rounded, the risk of interference between the substrate 131 of the insulating shell 13 and the bottom surface of the battery cell group 12 can be reduced during the assembly of the battery cell group 12 and the insulating shell 13, and the risk of interference between the corners of the substrate 131 of the insulating shell 13 and the outer shell 11 can be reduced during the assembly of the insulating shell 13 and the outer shell 11, thereby improving the convenience of assembling the insulating shell 13 with the battery cell group 12 and the outer shell 11, reducing the risk of damage to the corners of the insulating shell 13 due to friction, impact, shock, etc. during assembly, reducing the risk of damage to the insulating shell 13 during assembly, and improving the performance and service life of the insulating shell 13.

[0162] Of course, in other embodiments, the corners of the substrate 131 may not be rounded, for example, the corners of the substrate 131 may all be right angles.

[0163] Referring to Figures 3, 4, and 6, in some embodiments of the present application, the corners of the base sheet 131 adjacent to the extension flap 134 are rounded. Along the first direction a, the width d2 of the extension flap 134 is equal to the width d3 of the base sheet 131 minus the dimensions of the two corners of the base sheet 131 adjacent to the extension flap 134 (i.e., d4 and d5).

[0164] It should be noted that on the first side 135, the two corners of the base sheet 131 adjacent to the extension flap 134 are both rounded. One of the two corners has a dimension d4 along the first direction a, which may be equal to, but not limited to, the radius of the corner; the other corner has a dimension d5 along the first direction a, which may be equal to, but not limited to, the radius of the corner.

[0165] On the first side 135, along the first direction a, the width d2 of the extension flap 134 is equal to the width d3 of the base sheet 131 minus the dimension d4 of one corner of the base sheet 131 adjacent to the extension flap 134, and minus the dimension d5 of the other corner of the base sheet 131 adjacent to the extension flap 134. That is, d2 = d3 - d4 - d5.

[0166] By adopting the above solution, along the first direction a, the width d2 of the extension flap 134 is equal to: the width d3 of the base sheet 131 minus the dimension d4 of one corner of the base sheet 131 adjacent to the extension flap 134, and minus the dimension d5 of the other corner of the base sheet 131 adjacent to the extension flap 134. This allows the extension flap 134 to completely cover the gap between the corresponding edge of the base sheet 131 and the corresponding side flap 133. Based on this, the coverage effect of the extension flap 134 on the gap between the side flap 133 and the base sheet 131 can be optimized, reducing the risk of the extension flap 134 missing coverage of the gap. This optimizes the insulation effect of the side flap 133 and the extension flap 134 on the first side 135, and optimizes the insulation effect of the insulation case 13 between the battery cell assembly 12 and the outer shell 11.

[0167] Of course, in other embodiments, along the first direction a, the width d2 of the extended flap 134 may be less than or equal to the width d3 of the base film 131 .

[0168] Please refer to FIG. 3 , FIG. 4 , and FIG. 8 . In some embodiments of the present application, the extension flap 134 , the corner of the base sheet 131 adjacent thereto, and the side flap 133 adjacent thereto form a second notch 1342 .

[0169] It should be noted that, based on the previous embodiment, the second notch 1342 can be formed directly through the gap between the extension flap 134, the corner of the base sheet 131 adjacent to the extension flap 134, and the side flap 133 adjacent to the extension flap 134, without having to cut material to form the second notch 1342. When the insulation shell 13 is in the expanded state, the second notch 1342 has a trapezoidal shape, with the hypotenuse of the trapezoid being an arc formed by the rounded corners.

[0170] By adopting the above solution, building on the previous embodiment, the second notch 1342 can be formed by the extension flap 134, the corner of the base sheet 131 adjacent to the extension flap 134, and the side flap 133 adjacent to the extension flap 134. This reduces the pulling effect of the extension flap 134 on the adjacent side flap 133 during folding of the extension flap 134 to the corresponding side of the cell assembly 12, thereby optimizing the folding convenience and quality of the insulating case 13 and improving the smoothness and precision of the folding of the extension flap 134 and side flap 133. Furthermore, the second notch 1342 can be formed by utilizing the dimensions of the extension flap 134, the corner of the base sheet 131, and the side flap 133, without requiring material removal. This improves the ease of forming the second notch 1342 and optimizes the overall structure of the insulating case 13. In addition, the provision of the second notch 1342 also helps to reduce stress concentration in the adjacent areas of the side fold 133, the corners of the base sheet 131 and the extended fold 134, thereby reducing the risk of deformation or rupture in the adjacent areas of the side fold 133, the corners of the base sheet 131 and the extended fold 134, and optimizing the structural strength and service life of the insulating shell 13.

[0171] Of course, in other embodiments, the second notch 1342 may be formed in other ways, such as by removing material.

[0172] Please refer to FIG. 4 . In some embodiments of the present application, the first fold line 1361 is spaced apart from the corresponding side of the main fold piece 132 at at least one end in its extending direction.

[0173] It should be noted that, in some embodiments, the first fold line 1361 is spaced apart from the corresponding side of the main fold piece 132 at one end of its extension direction, that is, the first fold line 1361 does not extend continuously to the corresponding side of the main fold piece 132 at one end of its extension direction.

[0174] As shown in Figure 4, in other embodiments, the first fold line 1361 is spaced apart from the corresponding sides of the main fold piece 132 at the opposite ends of its extension direction, that is, the first fold line 1361 does not extend continuously to the corresponding sides of the main fold piece 132 at the opposite ends of its extension direction.

[0175] The corresponding side of the main folding piece 132 refers to the side of the main folding piece 132 corresponding to the end defined by the first folding line 1361 along the extension direction of the first folding line 1361.

[0176] The extending direction of the first fold line 1361 intersects (eg, is perpendicular to) the second direction b. In the unfolded state of the insulating shell 13, the extending direction of the first fold line 1361 may be parallel to (but not limited to) the first direction a.

[0177] By adopting the above solution, by spacing at least one end of the first fold line 1361 in its extension direction from the corresponding side of the main flap 132, the first fold line 1361 can be prevented from penetrating the main flap 132 in its extension direction. Consequently, the connection between the main flap 132 and the transition corner 136 in the area where the first fold line 1361 does not extend is strengthened, thereby maintaining and improving the connection strength, reliability, and durability between the main flap 132 and the transition corner 136. This reduces the risk of cracks, splits, and tears in the connection area between the main flap 132 and the transition corner 136, thereby improving the structural reliability and service life of the insulating shell 13.

[0178] Please refer to FIG. 4 . In some embodiments of the present application, the second fold line 1362 is spaced apart from the corresponding side of the side flap 133 at at least one end in its extending direction.

[0179] It should be noted that, in some embodiments, the second fold line 1362 is spaced apart from the corresponding side of the side fold piece 133 at one end of its extension direction, that is, the second fold line 1362 does not extend continuously to the corresponding side of the side fold piece 133 at one end of its extension direction.

[0180] As shown in Figure 4, in other embodiments, the second fold line 1362 is spaced apart from the corresponding sides of the side fold piece 133 at the opposite ends of its extension direction, that is, the second fold line 1362 does not extend continuously to the corresponding sides of the side fold piece 133 at the opposite ends of its extension direction.

[0181] The corresponding side of the side fold piece 133 refers to the side of the side fold piece 133 corresponding to the end defined by the second fold line 1362 along the extension direction of the second fold line 1362.

[0182] The extension direction of the second fold line 1362 intersects (eg, is perpendicular to) the second direction b. In the unfolded state of the insulation shell 13, the extension direction of the second fold line 1362 may be parallel to (but not limited to) the first direction a.

[0183] By adopting the above solution, by spacing at least one end of the second fold line 1362 in its extension direction from the corresponding side of the side flap 133, the second fold line 1362 can be prevented from penetrating the side flap 133 in its extension direction. As a result, the connection between the side flap 133 and the transition corner 136 in the area where the second fold line 1362 does not extend can be strengthened, thereby maintaining and improving the connection strength, connection reliability, and durability between the side flap 133 and the transition corner 136. This can reduce the risk of cracks, splits, and tears in the connection area between the side flap 133 and the transition corner 136, thereby improving the structural reliability and service life of the insulating shell 13.

[0184] Please refer to FIG. 4 . In some embodiments of the present application, the third fold line 1341 is spaced apart from the corresponding side of the extension flap 134 at at least one end in its extension direction.

[0185] It should be noted that, in some embodiments, the third fold line 1341 is spaced apart from the corresponding side of the extension fold 134 at one end of its extension direction, that is, the third fold line 1341 does not extend continuously to the corresponding side of the extension fold 134 at one end of its extension direction.

[0186] As shown in Figure 4, in other embodiments, the third fold line 1341 is spaced apart from the corresponding sides of the extension fold 134 at the opposite ends of its extension direction, that is, the third fold line 1341 does not extend continuously to the corresponding sides of the extension fold 134 at the opposite ends of its extension direction.

[0187] The corresponding side of the extension flap 134 refers to the side of the extension flap 134 corresponding to the end defined by the third fold line 1341 along the extension direction of the third fold line 1341 .

[0188] The extending direction of the third fold line 1341 intersects (eg, is perpendicular to) the second direction b. In the unfolded state of the insulation shell 13, the extending direction of the third fold line 1341 may be parallel to (but not limited to) the first direction a.

[0189] By adopting the above solution, by spacing at least one end of the third fold line 1341 in its extension direction from the corresponding side of the extension flap 134, the third fold line 1341 can be prevented from penetrating the extension flap 134 in its extension direction. Consequently, the connection between the extension flap 134 and the base sheet 131 in the region where the third fold line 1341 does not extend can be strengthened, thereby maintaining and improving the connection strength, reliability, and durability between the extension flap 134 and the base sheet 131. This can reduce the risk of cracks, splits, and tears in the connection region between the extension flap 134 and the base sheet 131, thereby improving the structural reliability and service life of the insulating case 13.

[0190] Please refer to FIG. 4 , FIG. 5 , and FIG. 6 . In some embodiments of the present application, the extension flap 134 is a rectangular structure.

[0191] By adopting the above solution, by making the extension flap 134 a rectangular structure, the shape of the extension flap 134 can be regularized, and the extension flap 134 can have a regular and large surface area, which can cover a wide area and reliably cover the gap between the corresponding side flap 133 and the base sheet 131. This can optimize the coverage effect of the extension flap 134 on the gap between the side flap 133 and the base sheet 131, and reduce the risk of the extension flap 134 missing the gap. In addition, the rectangular extension flap 134 is easy to process, fold, and install.

[0192] Of course, in other embodiments, the extension flap 134 may be in other shapes, such as a trapezoidal shape.

[0193] Please refer to FIG. 3 , FIG. 4 , and FIG. 6 . In some embodiments of the present application, the transition corner 136 is a rounded corner.

[0194] By adopting the above-mentioned scheme, by making the transition angle 136 a rounded angle, the connected main folding piece 132 and the side folding piece 133 can be connected by a rounded transition. Based on this, the stress concentration between the connected main folding piece 132 and the side folding piece 133 can be reduced, and the stress can be evenly distributed in the transition area between the connected main folding piece 132 and the side folding piece 133, thereby improving the connection strength and connection reliability between the connected main folding piece 132 and the side folding piece 133, reducing the risk of cracks and splits in the connection area between the main folding piece 132 and the side folding piece 133, and optimizing the structural strength and service life of the insulating shell 13. Moreover, during the assembly of the battery cell group 12 and the insulating shell 13, the rounded transition angle 136 can reduce the risk of interference between the edges of the insulating shell 13 and the battery cell group 12. During the assembly of the insulating shell 13 and the outer shell 11, the rounded transition angle 136 can reduce the risk of interference between the edges of the insulating shell 13 and the outer shell 11, thereby reducing the risk of damage to the edges of the insulating shell 13 due to friction, impact, shock, etc. during assembly, reducing the risk of damage to the insulating shell 13 during assembly, improving the convenience of assembly of the insulating shell 13 with the battery cell group 12 and the outer shell 11, and improving the performance and service life of the insulating shell 13.

[0195] Of course, in other embodiments, the transition corner 136 may be a chamfer.

[0196] Referring to Figures 3 to 7 , based on the aforementioned embodiments, the present invention provides a specific example of a battery cell 10. Battery cell 10 includes a housing 11, a cell group 12, and an insulating shell 13. Cell group 12 is housed within insulating shell 13 and includes multiple electrode assemblies 121 arranged side by side. Insulating shell 13 is housed within housing 11. Insulating shell 13 includes a base sheet 131, a main flap 132, and side flaps 133.

[0197] The substrate 131 supports the battery cell group 12. Each corner of the substrate 131 is rounded.

[0198] Two main flaps 132 are provided and are disposed on opposite sides of the base sheet 131 along the first direction a to respectively cover opposite sides of the battery cell group 12 along the first direction a. Along a second direction b perpendicular to the first direction a, opposite sides of the insulation shell 13 are both first sides 135.

[0199] On the first side 135 , both main flaps 132 are connected to side flaps 133 via transition angles 136 . The transition angles 136 are rounded. Each transition angle 136 is connected to the main flap 132 via a first fold line 1361 and to the side flap 133 via a second fold line 1362 . The two side flaps 133 are a first side flap 133a and a second side flap 133b . The first side flap 133a is partially folded outside the second side flap 133b , so that the two side flaps 133 jointly cover corresponding sides of the battery cell assembly 12 . Based on this, the first side fold piece 133a can form a pressing effect on the second side fold piece 133b through the part folded to the outside of the second side fold piece 133b, thereby enhancing the connection strength between the first side fold piece 133a and the second side fold piece 133b, which can be beneficial to maintaining the shape of the first side fold piece 133a and the second side fold piece 133b during the expansion of the battery cell group 12, and reducing the risk of the first side fold piece 133a and the second side fold piece 133b falling apart and being stretched, and can enable the first side fold piece 133a and the second side fold piece 133b to reliably, durably and comprehensively insulate and cover the corresponding sides of the battery cell group 12, thereby optimizing the insulating covering effect of the first side fold piece 133a and the second side fold piece 133b on the corresponding sides of the battery cell group 12, and optimizing the insulating effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11. Moreover, in the wrapped state of the insulating shell 13, even if there are processing errors in the dimensions of the battery cell group 12, the first side fold piece 133a, and the second side fold piece 133b along the first direction a, due to the overlapping part of the first side fold piece 133a and the second side fold piece 133b, the first side fold piece 133a and the second side fold piece 133b can be compatible with dimensional deviations within a certain range, and can still fully insulate and wrap the corresponding sides of the battery cell group 12, thereby improving the dimensional compatibility, applicability and reliability of the insulating shell 13.

[0200] On the first side 135, the base sheet 131 is connected to an extension flap 134 via a third fold line 1341. When the insulation shell 13 is unfolded, the third fold line 1341 lies between the first fold line 1361 and the second fold line 1362. Along the first direction a, the width d2 of the extension flap 134 is equal to the width d3 of the base sheet 131 minus the dimension d4 of one corner of the base sheet 131 adjacent to the extension flap 134, minus the dimension d5 of the other corner of the base sheet 131 adjacent to the extension flap 134, i.e., d2 = d3 - d4 - d5. The extension flap 134 is folded along the third fold line 1341 to the outside of the two side flaps 133, that is, to the outside of the first side flap 133a. The extension flap 134 closes the gap between the two side flaps 133 and the base sheet 131. Based on this, the bending of the extension flap 134 is facilitated, especially the connection and fixation of the extension flap 134 to the two side flaps 133. This allows for visual optimization of the extension flap 134's covering effect on the gap between the two side flaps 133 and the base sheet 131, reducing the risk of the extension flap 134 missing the covering gap. As a result, the folding convenience of the insulating shell 13 is improved, the structural reliability and stability of the insulating shell 13 in the covered state are improved, the risk of the insulating shell 13 falling apart is reduced, and the insulation effect of the insulating shell 13 between the battery cell group 12 and the outer shell 11 is optimized. Furthermore, by folding the extension flap 134 to the outside of the two side flaps 133, the two side flaps 133 can be enabled to reliably, comprehensively, and snugly cover the corresponding side surfaces of the battery cell group 12, thereby optimizing the insulation covering effect of the two side flaps 133 on the corresponding side surfaces of the battery cell group 12.

[0201] A first notch 1331 is provided at a corner of the first side flap 133a near the extension flap 134 and the second side flap 133b, and a portion of the first notch 1331 is exposed outside the extension flap 134. Therefore, near the first notch 1331, portions of the first side flap 133a, the second side flap 133b, and the extension flap 134 are exposed, making it easier for an adhesive structure (e.g., tape) to pass through the first notch 1331 and securely and firmly adhere the first side flap 133a, the second side flap 133b, and the extension flap 134.

[0202] The dimension d1 of the extension flap 134 along the direction perpendicular to the third fold line 1341 ranges from 5 mm to 15 mm. This allows the extension flap 134 to reliably cover the gap between the corresponding side flap 133 and the base sheet 131 when folded to the corresponding side of the battery cell assembly 12. Furthermore, the dimensions of the extension flap 134 are restricted accordingly, thereby reducing the amount of adhesive material (e.g., tape) used to secure the extension flap 134 and reducing the risk of warping of the extension flap 134 after it is secured.

[0203] The second notch 1342 is formed by the extension flap 134, the adjacent corner of the base sheet 131, and the adjacent side flap 133. This reduces the pulling effect of the extension flap 134 on the adjacent side flap 133 during folding of the extension flap 134 to the corresponding side of the cell assembly 12, thereby optimizing the folding convenience and quality of the insulating case 13 and improving the smoothness and precision of the folding of the extension flap 134 and side flap 133. Furthermore, the second notch 1342 can be formed by utilizing the dimensions of the extension flap 134, the corner of the base sheet 131, and the side flap 133, without requiring material removal. This improves the ease of forming the second notch 1342 and optimizes the overall structure of the insulating case 13. In addition, the provision of the second notch 1342 also helps to reduce stress concentration in the adjacent areas of the side fold 133, the corners of the base sheet 131 and the extended fold 134, thereby reducing the risk of deformation or rupture in the adjacent areas of the side fold 133, the corners of the base sheet 131 and the extended fold 134, and optimizing the structural strength and service life of the insulating shell 13.

[0204] The first fold line 1361 is spaced apart from the corresponding sides of the main flap 132 at its two opposite ends in its extension direction. This allows the first fold line 1361 to not penetrate the main flap 132 in its extension direction, resulting in a stronger connection strength between the main flap 132 and the transition corner 136 in the area where the first fold line 1361 does not extend. This maintains and improves the connection strength, reliability, and durability between the main flap 132 and the transition corner 136, reduces the risk of cracks, splits, and tears in the connection area between the main flap 132 and the transition corner 136, and thereby improves the structural reliability and service life of the insulating shell 13.

[0205] The second fold line 1362 is spaced apart from the corresponding sides of the side flap 133 at opposite ends of its extension direction. As a result, the second fold line 1362 does not penetrate the side flap 133 in its extension direction, ensuring a stronger connection strength between the side flap 133 and the transition corner 136 in the area where the second fold line 1362 does not extend. This maintains and improves the connection strength, reliability, and durability between the side flap 133 and the transition corner 136, reduces the risk of cracks, splits, and tears in the connection area between the side flap 133 and the transition corner 136, and thereby improves the structural reliability and service life of the insulating shell 13.

[0206] The third fold line 1341 is spaced apart from the corresponding sides of the extension flap 134 at opposite ends of its extension direction. This allows the third fold line 1341 to not penetrate the extension flap 134 in its extension direction, resulting in a stronger connection between the extension flap 134 and the base sheet 131 in the region where the third fold line 1341 does not extend. This maintains and improves the connection strength, reliability, and durability between the extension flap 134 and the base sheet 131, reduces the risk of cracks, splits, or tears in the connection region between the extension flap 134 and the base sheet 131, and thereby improves the structural reliability and service life of the insulating case 13.

[0207] The extension flap 134 is rectangular in structure. This allows for a regularized shape, a regular, large surface area, and the ability to cover a wide area. It can reliably seal the gap between the corresponding side flap 133 and the base sheet 131, thereby optimizing the gap coverage provided by the extension flap 134 and reducing the risk of the extension flap 134 missing gaps. Furthermore, the rectangular extension flap 134 facilitates processing, folding, and installation.

[0208] Please refer to Figures 2 and 3. Some embodiments of the present application provide a battery 1. The battery 1 includes a battery cell 10 provided in an embodiment of the present application.

[0209] By adopting the above solution, the battery 1 can improve the reliability and service life of each battery cell 10 by applying the battery cell 10 provided in the embodiment of the present application, thereby improving the reliability and service life of the battery 1.

[0210] Please refer to Figures 1 and 3. Some embodiments of the present application provide an electrical device, which includes a battery 1 provided in an embodiment of the present application, or a battery cell 10 provided in an embodiment of the present application.

[0211] By adopting the above solution, the electrical device can improve the reliability and service life of the electrical device by applying the battery 1 or battery cell 10 provided in the embodiment of the present application.

[0212] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell, wherein: The battery cell comprises: shell; A battery cell group is housed in the housing, the battery cell group including one or more electrode assemblies arranged side by side; An insulating shell comprising a base sheet, a main folding sheet, and a side folding sheet, wherein the base sheet supports the battery cell group, and two main folding sheets are provided and are respectively provided on opposite sides of the base sheet along a first direction to respectively cover the opposite sides of the battery cell group along the first direction; the insulating shell has a first side along a second direction, and the second direction is perpendicular to the first direction; On the first side: at least one of the main folding pieces is connected to the side folding piece via a transition angle, the side folding piece covers the corresponding side of the battery cell group, the transition angle is connected to the main folding piece through a first fold line, and is connected to the side folding piece through a second fold line, the base piece is connected to an extension folding piece via a third fold line, the third folding line is misaligned with the straight line where the first folding line is located in the unfolded state of the insulating shell, and / or misaligned with the straight line where the second folding line is located, the extension folding piece is folded to the corresponding side of the battery cell group, and covers the gap between the corresponding side folding piece and the base piece.

2. The battery cell according to claim 1, wherein: The third fold line is located between the straight line where the first fold line is located and the straight line where the second fold line is located when the insulating shell is in the unfolded state.

3. The battery cell according to claim 1 or 2, wherein: The extension flaps are folded to the outer sides of the corresponding side flaps.

4. The battery cell according to any one of claims 1 to 3, wherein: On the first side, the two main folding pieces are connected to the side folding pieces via the transition angles, and the two side folding pieces jointly cover corresponding sides of the battery cell group.

5. The battery cell according to claim 4, wherein: The extension flap is folded to the outer sides of the two side flaps.

6. The battery cell according to claim 4 or 5, wherein: On the first side, the two side folds are respectively a first side fold and a second side fold, and a portion of the first side fold is folded to the outside of the second side fold.

7. The battery cell according to claim 6, wherein: A first notch is formed in a portion of the first side flap folded to the outside of the second side flap.

8. The battery cell according to claim 7, wherein: The extension flap is folded to the outside of the first side flap and the second side flap, or the extension flap is folded between the first side flap and the second side flap; The first notch is provided at one end of the first side fold close to the extension fold, and a portion of the first notch is exposed outside the extension fold.

9. The battery cell according to claim 7 or 8, wherein: The first notch is provided at a corner of the first side flap close to the extension flap.

10. The battery cell according to any one of claims 1 to 9, wherein: Along a direction perpendicular to the third fold line, the size of the extended flap ranges from 5 mm to 15 mm.

11. The battery cell according to any one of claims 1 to 10, wherein: A second notch is provided between the extension flap and the side flap adjacent thereto.

12. The battery cell according to any one of claims 1 to 11, wherein: At least one corner of the substrate is rounded.

13. The battery cell according to claim 12, wherein: The corner of the base sheet adjacent to the extension flap is rounded; Along the first direction, the width of the extension flap is equal to the width of the base sheet minus the dimensions of two corners of the base sheet adjacent to the extension flap.

14. The battery cell according to claim 13, wherein: The extension flap, the corner of the base sheet adjacent thereto, and the side flap adjacent thereto form a second notch.

15. The battery cell according to any one of claims 1 to 14, wherein: The first fold line is spaced apart from a corresponding side of the main fold piece at at least one end of the first fold line in its extending direction.

16. The battery cell according to any one of claims 1 to 15, wherein: The second fold line is spaced apart from the corresponding side of the side fold piece at at least one end of the second fold line in its extending direction.

17. The battery cell according to any one of claims 1 to 16, wherein: The third fold line is spaced apart from a corresponding side of the extension flap at at least one end of the third fold line in its extension direction.

18. The battery cell according to any one of claims 1 to 17, wherein: The extension flap is a rectangular structure.

19. The battery cell according to any one of claims 1 to 18, wherein: The transition angle is a rounded angle.

20. A battery, wherein: The battery comprises the battery cell according to any one of claims 1 to 19.

21. An electrical device, wherein: The electrical device comprises the battery according to claim 20, or the battery cell according to any one of claims 1 to 19.

Images