Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, a first insulating part and a second insulating part, the shell comprises a first surface and a second surface which are intersected, when the battery monomer is arranged in the battery device, the first surface is configured to face the bottom of the battery device, and the second surface is configured to face the bottom of the battery device; the first insulating part wraps the outer side of the shell and covers the first surface and the second surface, the first insulating part is provided with an ending wrapping area comprising a communication area, the ending wrapping area is arranged opposite to at least one of the first surface and the second surface, the shell is communicated with the outside through the communication area, the second insulating part is arranged between the shell and the first insulating part, and the second insulating part is arranged between the shell and the second insulating part. The communication area has a first orthographic projection on the outer surface of the shell, the second insulating part has a second orthographic projection on the outer surface of the shell, the first orthographic projection is located in the second orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero, so that the flowing path of water is prolonged, and the insulating property of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery cell, battery device and electrical equipment. Background Technology

[0002] With the development of new energy sources, more and more fields are adopting new energy as a power source. Due to its advantages such as high energy density, rechargeability, safety, and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] In related technologies, battery devices include a housing and multiple battery cells housed within the housing. When water leaks inside the housing, the leaked water can seep into the surface of the battery cells, affecting their insulation and causing the battery device to fail to meet insulation requirements. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, which solves the problem of the insulation of the battery cell being affected by water leakage.

[0005] The first aspect of this application discloses a battery cell for use in a battery device, the battery cell comprising:

[0006] The housing has multiple surfaces, including a first surface and a second surface, the first surface intersecting the second surface, and the first surface being configured to face the bottom of the battery device when the battery cell is disposed within the battery device;

[0007] The first insulating member covers the outside of the housing and covers the first surface and the second surface. The first insulating member has a tail covering area, which is disposed opposite to at least one of the first surface and the second surface. The tail covering area has a connecting area, which can connect the outside world with the outer surface of the housing.

[0008] The second insulating element is disposed between the housing and the first insulating element. The connected region has a first orthographic projection on the outer surface of the housing, and the second insulating element has a second orthographic projection on the outer surface of the housing. The first orthographic projection is located within the second orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero.

[0009] In this application, a second insulating member is provided between the first insulating member and the housing. The first orthographic projection of the connecting region is set to fall within the range of the second orthographic projection of the second insulating member, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member can effectively block the connection between the housing and the connecting region. When water leakage occurs outside the battery cell, after the water reaches the connecting region, the obstruction of the second insulating member prolongs the path of the water flowing through the connecting region to the outer surface of the housing, reducing the possibility of water contacting the battery cell's housing and improving the insulation performance of the battery cell.

[0010] In some embodiments of this application, at least one of the first insulating member and the housing is connected to the second insulating member. This arrangement allows the second insulating member to be effectively held between the first insulating member and the housing, reducing the possibility of the second insulating member failing to block the connected area due to vibration or other movement, further improving the blocking effect of the second insulating member on the connected area, and thus further enhancing the insulation performance of the battery cell.

[0011] In some embodiments of this application, the second insulating member is connected to the housing, and the second insulating member includes an insulating film. This configuration allows for independent processing of the second insulating member, improving processing convenience and thus reducing the manufacturing cost of the second insulating member.

[0012] In some embodiments of this application, the second insulating member is connected to the housing, and the second insulating member includes an insulating coating. This arrangement allows the second insulating member to be effectively held on the housing, improving the positional accuracy of the second insulating member relative to the housing. When the first insulating member is located on the outside of the housing, the second insulating member can be effectively used to block the connecting area of ​​the tail-end covering region of the first insulating member, thereby improving the insulation performance of the battery cell.

[0013] In some embodiments of this application, the thickness of the second insulating member ranges from 10 micrometers to 200 micrometers. This configuration allows the second insulating member to have better insulation performance while reducing its footprint on the external space of the battery cell, thereby helping to reduce the overall volume of the battery cell.

[0014] In some embodiments of this application, the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than or equal to 15 mm. This arrangement effectively extends the path of the water flowing through the connected region to the surface of the casing, thereby further improving the insulation performance of the battery cell.

[0015] In some embodiments of this application, the multiple surfaces also include a third surface, which is the surface with the largest area. The first surface, the second surface, and the third surface are arranged to intersect each other. When the battery cell is disposed in the battery device, the third surface is configured to face the side of the battery device. The first insulating member covers the third surface, and the second orthographic projection avoids the third surface.

[0016] This design allows the second insulating element to avoid the location of the third surface, reducing interference when the second insulating element expands on the third surface.

[0017] In some embodiments of this application, there are two second surfaces and two third surfaces. The two second surfaces are arranged opposite each other along a first direction, and the two third surfaces are arranged opposite each other along a second direction. The first direction and the second direction intersect, and the first direction and the second direction are parallel to the first surface, respectively. At least one second surface is covered by a second orthographic projection, and the second orthographic projection covers at least a portion of the second surface.

[0018] The second surface and the third surface include a first transition fillet, and there is a first transition portion between the first transition fillet and the third surface. The second orthographic projection is flush with the first transition portion or spaced apart from the first transition portion.

[0019] This configuration allows the second insulating element to avoid the location of the third surface, and by setting the position of the second insulating element, the blocking effect on the connected area can be improved, thereby extending the time for water to enter through the connected area, and further improving the insulation performance of the battery cell.

[0020] In some embodiments of this application, the first insulating member is U-shaped and surrounds a first surface and two third surfaces. The tail-end covering area is disposed on a second surface. In the two second surfaces, at least a portion of each second surface is covered by a second orthographic projection. The tail-end covering area includes two first tail-end covering portions. Each second surface is provided with a first tail-end covering portion opposite to each other. The connecting area includes two first connecting portions. Each first tail-end covering portion is provided with a first connecting portion opposite to each other.

[0021] The first finishing covering portion includes a first fold structure, the first fold structure includes a first crease, the first crease and the first connecting portion are both located inside the first fold structure, and the first connecting portion is connected to the outside through the first crease.

[0022] The first crease is used to increase the path of water flowing from the outside to the connected area, and the second insulating element is provided to extend the path of water flowing from the connected area to the surface of the casing. This arrangement further extends the path of water flowing from the outside to the surface of the casing, thereby further improving the insulation performance of the battery cell.

[0023] In some embodiments of this application, the first crease is parallel to the second surface, the first surface, the second surface and the third surface have intersecting positions, the first insulating member includes a folded corner position, the folded corner position is disposed opposite to the intersecting position, one end of the first crease is connected to the folded corner position, and the other end of the first crease is disposed inclined to the side away from the first surface and connected to the first communicating portion.

[0024] This design extends the path from the outside to the connected area, thus lengthening the path for the liquid to reach the surface of the casing and further improving the insulation performance of the battery cell.

[0025] In some embodiments of this application, the first insulating member is arranged in a ring shape, the first insulating member surrounds two second surfaces and two third surfaces, at least a portion of one second surface is covered by a second orthographic projection, the tailing area includes a second tailing portion, and the second surface covered by the second orthographic projection is disposed opposite to the second tailing portion.

[0026] The connected region includes a second connected portion, and the second closing covering portion includes an overlapping region. The second connected portion is located within the overlapping region, and the second connected portion is connected to the outside through the overlapping region.

[0027] By utilizing the overlapping area to increase the path of water flowing from the outside to the connected area, and by setting a second insulating element, the path of water flowing from the connected area to the surface of the casing is extended. This arrangement further extends the path of water flowing from the outside to the surface of the casing, thereby further improving the insulation performance of the battery cell.

[0028] In some embodiments of this application, the finishing covering area further includes a third finishing covering portion, which is disposed opposite to the first surface, and the second orthographic projection covers at least a portion of the first surface;

[0029] The connected region also includes a third connected portion. The third closing and covering portion includes a second fold structure. The second fold structure includes a second crease. The second crease and the third connected portion are both located within the second fold structure, and the third connected portion is connected to the outside through the second crease.

[0030] The second crease is used to increase the path of water flowing from the outside to the connected area, and the second insulating element is provided to extend the path of water flowing from the connected area to the surface of the casing. This arrangement further extends the path of water flowing from the outside to the surface of the casing, thereby further improving the insulation performance of the battery cell.

[0031] In some embodiments of this application, a second transition fillet is included between the first surface and the third surface, and a second transition portion is provided between the second transition fillet and the third surface. The second orthographic projection is flush with or spaced apart from the second transition portion.

[0032] This configuration allows the second insulating element to avoid the location of the third surface, and by setting the position of the second insulating element, the blocking effect on the connected area can be improved, thereby extending the time for water to enter through the connected area, and further improving the insulation performance of the battery cell.

[0033] A second aspect of this application provides a battery device comprising a battery cell as described above.

[0034] In this application, a battery cell of the battery device has a second insulating member disposed between a first insulating member and the casing. The first orthographic projection of the connecting area is positioned within the range of the second orthographic projection of the second insulating member, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member can effectively block the connection between the casing and the connecting area. When water leakage occurs outside the battery cell, after the water reaches the connecting area, the obstruction of the second insulating member prolongs the path of the water flowing through the connecting area to the surface of the casing, reducing the possibility of water contacting the casing of the battery cell and improving the insulation performance of the battery cell.

[0035] A third aspect of this application provides an electrical appliance that includes a battery device as described above.

[0036] In this application, a battery cell in a battery device has a second insulating member disposed between a first insulating member and the casing. The first orthographic projection of the connected area is positioned within the range of the second orthographic projection of the second insulating member, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member effectively blocks the connection between the casing and the connected area. When water leaks from the outside of the battery cell, the water reaches the connected area, and due to the obstruction of the second insulating member, the path of the water flowing through the connected area to the surface of the casing is prolonged, reducing the possibility of water contacting the battery cell casing and improving the insulation performance of the battery cell.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] Figure 1A schematic diagram of the structure of a vehicle according to one embodiment of this application is shown.

[0039] Figure 2 A schematic diagram of the structure of a battery device according to one embodiment of this application is shown.

[0040] Figure 3 A schematic diagram of the structure of a battery cell according to one embodiment of this application is shown.

[0041] Figure 4 A schematic diagram of the structure of a battery cell according to one embodiment of this application is shown.

[0042] Figure 5 for Figure 4 The diagram shows the structure of a single battery cell from a first-person perspective;

[0043] Figure 6 for Figure 4 The diagram shows the structure of a single battery cell from a second-view perspective;

[0044] Figure 7 for Figure 6 A magnified structural diagram of point A of the battery cell shown;

[0045] Figure 8 A schematic diagram of the structure of a battery cell according to one embodiment of this application is shown.

[0046] Figure 9 for Figure 8 The diagram shows the structure of a single battery cell from a first-person perspective;

[0047] Figure 10 for Figure 8 The diagram shows the structure of a single battery cell from a second-view perspective;

[0048] Figure 11 for Figure 10 A cross-sectional view of the battery cell at point BB shown;

[0049] Figure 12 for Figure 11 The diagram shows an enlarged view of the structure at point C of the battery cell.

[0050] The attached figures are labeled as follows:

[0051] 1000, vehicles;

[0052] 100. Battery assembly; 200. Controller; 300. Motor;

[0053] 10. Battery cell modules;

[0054] 11. Battery cell;

[0055] 111. Shell;

[0056] 1111, First surface; 1112, Second surface; 1113, Third surface; 1114, First transition fillet; 1115, First transition portion; 1116, Fourth surface; 1117, Electrode terminal; 1118, Second transition fillet; 1119, Second transition portion;

[0057] 112. First insulating component;

[0058] 1121. Finishing area; 1122. First finishing portion; 1123. First fold structure; 1124. First crease; 1125. Connecting region; 1126. Nearest connected position; 1127. Second finishing portion; 1128. Third finishing portion; 1129. Second fold structure; 1130. Second crease;

[0059] 113. Second insulating component;

[0060] 20. Box body;

[0061] 21. First box; 22. Second box;

[0062] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0069] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0071] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0072] In related technologies, battery devices include a housing and multiple battery cells housed within the housing. When water leaks from the housing, the leaked water can penetrate the surface of the battery cells, affecting their insulation and causing the battery device to fail to meet insulation requirements.

[0073] In this application, a battery cell includes a casing, a first insulating member, and a second insulating member. The casing has multiple surfaces, including a first surface and a second surface, which intersect. When the battery cell is disposed inside the casing of a battery device, the first surface is configured to face the bottom wall of the casing of the battery device. The first insulating member covers the outside of the casing and covers the first and second surfaces. The first insulating member has a tail covering area, which is disposed opposite to at least one of the first and second surfaces. The tail covering area has a connecting region, which can connect the outside world with the outer surface of the casing. The second insulating member is disposed between the casing and the first insulating member. The connecting region has a first orthographic projection on the outer surface of the casing, and the second insulating member has a second orthographic projection on the outer surface of the casing. The first orthographic projection is located within the second orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. In this application, a second insulating member is provided between the first insulating member and the housing. The first orthographic projection of the connecting region is set to fall within the range of the second orthographic projection of the second insulating member, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member can effectively block the connection between the housing and the connecting region. When water leakage occurs outside the battery cell, after the water reaches the connecting region, the obstruction of the second insulating member prolongs the path of the water flowing through the connecting region to the surface of the housing, reducing the possibility of water contacting the battery cell's housing and improving the insulation performance of the battery cell.

[0074] The technical solutions described in this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0075] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may contain a motor 300, a controller 200, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0076] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0077] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0078] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0079] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more battery cell assemblies 10, with the battery cell assemblies 10 housed in the housing 20.

[0080] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0081] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0082] As an example, such as Figure 2 As shown, the housing 20 may include a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 21 may be a top cover or a bottom plate.

[0083] As an example, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 20 forms an enclosed space to accommodate the battery cell assembly 10.

[0084] In some embodiments, the housing 20 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 20 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0085] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 11, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0086] In some embodiments of this application, the battery cell 11 can be a secondary battery, which refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0087] The battery cell 11 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0088] As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0089] The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 11, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0090] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0091] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0092] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0094] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0095] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0096] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0097] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0098] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0099] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 11. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 11 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0100] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0101] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0102] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0103] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0104] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0105] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0106] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0107] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0108] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0109] In some implementations, the electrode assembly is a stacked structure.

[0110] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0111] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0112] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0113] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0114] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0115] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0116] In some embodiments, the electrode assembly has tabs on its plates that allow current to be drawn out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0117] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal gas of the battery cell 11.

[0118] As an example, the internal pressure or temperature of the battery cell 11 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 11 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 11.

[0119] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0120] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0121] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 11. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 11 are discharged outwards from the actuated portion as waste. This method enables the battery cell 11 to release pressure and temperature under controllable pressure or temperature conditions, thereby reducing the potential for more serious accidents.

[0122] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas inside the battery cell 11.

[0123] The emissions from the battery cell 11 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0124] The positive and negative electrodes can be drawn from the same end of the electrode plate, or they can be drawn from opposite ends of the electrode plate.

[0125] The structures of the positive and negative electrode tabs can be the same or different. Taking the positive electrode tab as an example, the positive electrode tab can include multiple positive electrode tab layers, which are stacked together to form the positive electrode tab. The positive electrode tab can include at least two parts: one part is located between the main body of the electrode sheet and the insulating component, and the other part is located between the insulating component and the electrode lead-out component.

[0126] The insulating component can insulate at least part of the tab from the end face of the main body, thereby reducing the risk of the tab being inserted into the main body when the battery cell 11 is affected by external impacts, vibrations, etc., thereby reducing the risk of short circuit in the battery cell 11 and improving the reliability of the battery cell 11.

[0127] The insulating component can be a one-piece structure or a modular structure. As one example, the insulating component is composed of multiple independently formed parts connected together. As another example, the insulating component is formed as a single piece by stamping.

[0128] For example, the insulating part is made of plastic. The insulating part is integrally molded by injection molding. Plastic parts are easy to process and have low manufacturing costs.

[0129] In some embodiments of this application, the housing includes a shell and an end cap, the shell having an opening, the end cap being connected to the shell and closing the opening, the end cap forming a first sidewall, and a pressure relief mechanism being disposed on the end cap.

[0130] In some embodiments of this application, the outer casing can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the outer casing can be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, the outer casing serves to protect the electrode assembly, and a sealing bag is included between the outer casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte. The casing may have one or more openings. End caps may also be provided one or more.

[0131] In addition, the connection methods between the end cap and the housing include, but are not limited to, snap-fit, adhesive, welding or connection via connectors.

[0132] In some embodiments of this application, the battery cell 11 further includes electrode terminals, which are disposed on the end cap and electrically connected to the electrode assembly. The electrode terminals are electrically connected to the tabs of the electrode assembly. The electrode terminals can be directly connected to the tabs or indirectly connected to the tabs through a current collector. The electrode terminals can be disposed on the end cap or on the housing. In the embodiments shown in this application, the electrode terminals are disposed on the end cap.

[0133] like Figures 3 to 12 As shown, in some embodiments of this application, a battery cell 11 is proposed, which can be used in a battery device 100.

[0134] The battery cell 11 includes a housing 111, a first insulating member 112, and a second insulating member 113. The housing 111 has multiple surfaces, including a first surface 1111 and a second surface 1112, which intersect. When the battery cell 11 is disposed within the battery device 100, the first surface 1111 is configured to face the bottom of the battery device 100. The first insulating member 112 covers the outside of the housing 111 and covers the first surface 1111 and the second surface 1112. The first insulating member 112 has a tapering coverage area 1121. 1121 is disposed opposite to at least one of the first surface 1111 and the second surface 1112. The tail covering area 1121 has a connecting region 1125, which can connect the outside world with the outer surface of the housing 111. The second insulating member 113 is disposed between the housing 111 and the first insulating member 112. The connecting region 1125 has a first orthographic projection on the outer surface of the housing 111, and the second insulating member 113 has a second orthographic projection on the outer surface of the housing 111. The first orthographic projection is located within the second orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero.

[0135] In this application, the battery cell 11 includes a housing 111, and an electrode assembly is provided inside the housing 111. The housing 111 is a metal part (e.g., stainless steel). The metal housing 111 has high structural strength and can effectively improve the protection performance of the electrode assembly.

[0136] In order to improve the insulation performance of the battery cell 11, the metal casing 111 needs to be insulated. The first insulating component 112 is a component with insulating properties. The first insulating component 112 is used to cover the casing 111 so that the casing 111 is isolated from the outside world, thus making the casing 111 insulated from the outside world.

[0137] It should be understood that the first insulating member 112 is disposed on the outside of the housing 111 by covering it. The first insulation has a certain degree of flexibility, and the first insulating member 112 can be bent according to the shape of the housing 111 (without breaking at the bending point) to adapt to the structural shape of the housing 111. For example, the first insulating member 112 is a film material (such as polypropylene (PP) or polyethylene (PE) film, etc.). The first insulating member 112, which is a film material, can be fixed to the outer surface of the housing 111 by means of adhesive bonding, etc., to improve the fixing strength between the first insulating member 112 and the housing 111, and reduce the occurrence of insulation failure of the housing 111 due to the first insulating member 112 loosening and falling off.

[0138] The first insulating member 112 is disposed on at least a portion of the outer surface of the housing 111 by means of a covering, forming a covering structure on the outside of the housing 111. After the covering is completed, there is a covering end area, which is used to accommodate the remaining material covering the first insulating member 112, thereby reducing the space occupied by the first insulating member 112 on the external space of the battery cell 11 and helping to reduce the overall volume of the battery cell 11. When the battery cell 11 is used in the battery device 100, it helps to improve the energy volume density of the battery device 100.

[0139] The finishing wrapping area 1121 refers to the area formed by the remaining material after the first insulating member 112 has completed the wrapping operation on the shell 111, through folding or other means. This allows the first insulating member 112 to insulate the shell 111 of the battery cell 11 while reducing the space occupied by the battery cell 11, thus reducing the overall volume of the battery cell 11.

[0140] The finishing covering area 1121 includes splicing positions (e.g., formed by overlapping or butt jointing of the main body at different positions of the first insulating member 112). At these splicing positions, which are not absolutely sealed, liquid can enter and contact the housing 111. These splicing positions are the connecting regions 1125 in this application, which can specifically be a line or an area of ​​a certain size.

[0141] The second insulating member 113 is also a component with insulating properties. The second insulating member 113 is disposed between the first insulating member 112 and the housing 111. The second insulating member 113 can be connected to at least one of the housing 111 or the first insulating member, or it can be sandwiched between the first insulating member 112 and the housing 111.

[0142] The first insulating member 112 covers the outside of the housing 111 and forms a stacked structure. The first orthographic projection of the connecting region 1125 refers to the projection of the connecting region 1125 on the outer surface of the housing 111 along the direction perpendicular to the stacking. The second orthographic projection of the second insulating member 113 refers to the projection of the second insulating member 113 on the outer surface of the housing 111 along the direction perpendicular to the stacking.

[0143] The first orthographic projection being located within the second orthographic projection means that the first orthographic projection is formed within the area where the second orthographic projection is located, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero (i.e., the edge of the first orthographic projection and the edge of the second orthographic projection are spaced apart).

[0144] When the battery cell 11 in this application is used in the battery device 100, the battery cell 11 is disposed inside the battery device 100. The first surface 1111 of the battery cell 11 faces the bottom of the battery device 100, and the second surface 1112 faces the side of the battery device 100. When the battery device 100 has multiple battery cells 11, if some of the battery cells 11 leak electrolyte or if the cooling component inside the battery device 100 leaks coolant, the leaked water will accumulate at the bottom of the battery device 100 under the action of gravity. The leaked water inside the battery device 100 may intrude into the end-covering area 1121 of the battery cells 11 that have not leaked, and may flow through the communicating area 1125 of the end-covering area 1121 to the outer surface of the casing 111 of the battery cell 11.

[0145] The connecting region 1125 of the tail covering area 1121 has the nearest connecting position 1126. After the water reaches the connecting region 1125, it will preferentially enter through the nearest connecting position 1126 and flow to the outer surface of the shell.

[0146] When the finishing covering area 1121 covers at least one of the first surface 1111 and the second surface 1112, the leaked water may leak at the location of at least one of the first surface 1111 and the second surface 1112.

[0147] In this application, a second insulating member 113 is provided between the first insulating member 112 and the housing 111. The first orthographic projection of the connecting region 1125 is set to be within the range of the second orthographic projection of the second insulating member 113, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member 113 can be used to block the connection between the housing 111 and the connecting region 1125. When water leakage occurs outside the battery cell 11, after the water reaches the position of the connecting region 1125, due to the obstruction of the second insulating member 113, the water will flow along the side of the second insulating member 113 toward the first insulating member 112, thereby lengthening the path of the water flowing through the connecting region 1125 to the surface of the housing 111, reducing the possibility of water contacting the housing 111 of the battery cell 11, and improving the insulation performance of the battery cell 11.

[0148] It should be noted that when the battery cell 11 is used in the battery device 100, the battery device 100 may or may not include the housing 20. When the battery device 100 includes the housing 20, the battery cell 11 is disposed inside the housing 20, and the first surface 1111 of the housing 111 faces the inner bottom surface of the housing 20, and the second surface 1112 faces the side surface of the housing 20. When the battery device 100 does not include the housing 20, the battery device 100 includes a pouch structure that covers the outside of a plurality of battery cells 11, with the first surface 1111 of the housing 111 facing the bottom of the pouch structure and the first surface 1111 of the housing 111 facing the side surface of the pouch structure.

[0149] In some embodiments of this application, at least one of the first insulating member 112 and the housing 111 is connected to the second insulating member 113.

[0150] Specifically, the second insulating member 113 is disposed between the first insulating member 112 and the housing 111 of the battery cell 11, and the second insulating member 113 at least blocks the connecting area 1125 of the tail covering area 1121 of the first insulating member 112. That is, the first orthographic projection of the connecting area 1125 on the outer surface of the housing 111 is located within the second orthographic projection of the second insulating member 113 on the outer surface of the housing 111 (the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero). This allows the second insulating member 113 to extend the flow path of the liquid entering through the connecting area 1125, reducing the possibility of the liquid contacting the housing 111 of the battery cell 11 and improving the insulation performance of the battery cell 11.

[0151] The location of the second insulating member 113 directly determines the blocking effect on the connecting area 1125 of the tail covering area 1121 of the first insulating member 112.

[0152] In this application, both the first insulating member 112 and the second insulating member 113 are disposed on the outside of the housing 111 of the battery cell 11, with the second insulating member 113 disposed between the first insulating member 112 and the housing 111. The second insulating member 113 is fixed between the first insulating member 112 and the housing 111. This arrangement effectively maintains the second insulating member 113 between the first insulating member 112 and the housing 111, reducing the possibility of the second insulating member 113 failing to block the communication area 1125 due to vibration or other movement. This further improves the blocking effect of the second insulating member 113 on the communication area 1125, thereby further improving the insulation performance of the battery cell 11.

[0153] For example, the second insulating member 113 may be connected only to the outer surface of the housing 111. During assembly, the second insulating member 113 is first fixed to the outer surface of the housing 111 (the second insulating member 113 is positioned at the location of the first insulation forming the tail covering area 1121), and then the first insulating member 112 is disposed on the outside of the housing 111.

[0154] For example, the second insulating member 113 may be connected only to the first insulating member 112. During assembly, the second insulating member 113 is first held on the outer surface of the housing 111 (the second insulating member 113 is positioned at the location of the first insulation forming the tail covering area 1121, and there is no fixed relationship between the second insulating member 113 and the housing 111, for example, it can be attached to the outer surface of the housing 111 by electrostatic means), and then the first insulating member 112 is placed on the outside of the housing 111.

[0155] For example, the first insulating member 112 can be connected to the second insulating member 113. During assembly, the second insulating member 113 is first fixed to the outer surface of the housing 111 (the second insulating member 113 is positioned at the location of the first insulation forming the tail covering area 1121), and then the first insulating member 112 is placed on the outside of the housing 111, and the first insulating member 112 is connected and fixed to the second insulating member 113.

[0156] The following explanation uses the example of the second insulating element 113 being fixed to the outer casing as an example:

[0157] In some embodiments of this application, the second insulating member 113 is connected to the housing 111, and the second insulating member 113 includes an insulating film.

[0158] Specifically, the second insulating member 113 is configured as an insulating film, which is a thin and light-weight member that can reduce the space occupied on the exterior of the housing 111.

[0159] In addition, the insulating film is a flexible film, which has better flexibility (i.e., the insulating film has better tensile and bending resistance), which makes it easy for the insulation to be set in a conformal manner on the outer surface of the housing 111. In this way, the insulating film can be effectively arranged on the housing 111, so that the second insulating member 113 can be used to extend the path from the connecting area 1125 of the tail covering area 1121 of the first insulating member 112 into the liquid, thereby improving the insulation effect of the battery cell 11.

[0160] The second insulating member 113, which is an insulating film, may include an adhesive layer. The insulating film is fixed to the outer surface of the housing 111 by means of adhesive layer. This method facilitates the implementation during the assembly process and can improve the fixing strength between the second insulating member 113 and the housing 111.

[0161] By setting the second insulating element 113 as an insulating film, the second insulating element 113 can be processed independently, which improves the convenience of processing and thus reduces the manufacturing cost of the second insulating element 113.

[0162] It should be noted that the insulating film can be a blue film or a PI (polyimide) film, etc.

[0163] In addition, the insulating film possesses corrosion resistance and high-temperature resistance. Specifically, the melting point of the insulating film is greater than or equal to 200 degrees Celsius (for example, specific melting points include 200 degrees Celsius, 220 degrees Celsius, 240 degrees Celsius, 260 degrees Celsius, 280 degrees Celsius, 300 degrees Celsius, 320 degrees Celsius, 350 degrees Celsius, and 400 degrees Celsius). The insulating film meets the requirement of not cracking, peeling, or bubbling when immersed in the electrode solution of the battery cell 11, and no electrical conductivity is observed at the location of the insulating film during insulation performance testing.

[0164] In some embodiments of this application, the second insulating member 113 is connected to the housing 111, and the second insulating member 113 includes an insulating coating.

[0165] Specifically, the second insulating member 113 is configured as an insulating coating. The insulating coating is applied to the housing 111 by coating or electroplating, and the position of the insulating coating is opposite to the connecting area 1125 of the tail covering area 1121 of the first insulating member 112. This configuration allows the second insulating member 113 to be effectively held on the housing 111, improving the positional accuracy of the second insulating member 113 relative to the housing 111. When the first insulating member 112 is located on the outside of the housing 111, the second insulating member 113 can be effectively used to block the connecting area 1125 of the tail covering area 1121 of the first insulating member 112, thereby improving the insulation performance of the battery cell 11.

[0166] It should be noted that the insulating coating can specifically include iron oxide red epoxy modified cover varnish EP5, solvent-free epoxy impregnation varnish, epoxy powder coating, polyurethane insulating varnish, UV-cured polyurethane coating, waterborne polyurethane insulating coating, organosilicon insulating varnish, silicone resin coating, silicone coating, polyimide (PI) insulating varnish, PI film coating, thermosetting polyimide coating, alumina ceramic coating, zirconium oxide coating, silane coupling agent modified inorganic coating, etc.

[0167] In some embodiments of this application, the thickness of the second insulating member 113 ranges from 10 micrometers to 200 micrometers.

[0168] Specifically, the second insulating member 113 is disposed between the first insulating member 112 and the housing 111 of the battery cell 11. The thickness of the second insulating member 113 refers to its dimension in the direction in which the first insulating member 112 and the housing 111 are arranged. The first insulating member 112 covers the housing 111 and the second insulating member 113. At the edge of the second insulating member 113, there is a transition area between the first insulating member 112 and the housing 111. By controlling the thickness of the second insulating member 113, the drop at the transition area can be controlled within a reasonable range, reducing gaps between the first insulating member 112 and the housing 111. This reduces the amount of liquid flowing through the gaps to the surface of the battery cell 11, thereby improving the insulation performance of the battery cell 11.

[0169] In addition, by controlling the thickness of the second insulation, the second insulation component 113 can have better insulation performance while reducing the space occupied by the battery cell 11, thereby helping to reduce the overall volume of the battery cell 11.

[0170] It should be noted that the specific values ​​for the thickness of the second insulation can be 10 micrometers, 20 micrometers, 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, 90 micrometers, 100 micrometers, 110 micrometers, 120 micrometers, 130 micrometers, 140 micrometers, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, and 200 micrometers.

[0171] In some embodiments of this application, the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than or equal to 15 mm.

[0172] Specifically, the second insulating member 113 is disposed between the first insulating member 112 and the housing 111 of the battery cell 11. The connecting area 1125 of the tail covering area 1121 of the first insulating member 112 has a first orthographic projection on the outer surface of the housing 111, and the second insulating member 113 has a second orthographic projection on the outer surface of the housing 111. The first orthographic projection is located within the second orthographic projection of the second insulating member 113 on the outer surface of the housing 111, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero, that is, the edge of the first orthographic projection and the edge of the second orthographic projection are spaced apart.

[0173] It should be understood that the second insulating member 113 forms a block on the connecting area 1125 of the first insulating member 112, wherein the first projection of the connecting area 1125 of the first insulating member 112 is within the second projection of the second insulating member 113, and the minimum distance between the edges of the two is the position where the liquid first contacts the housing 111 after entering through the connecting area 1125.

[0174] When water leaks from the outside of the battery cell 11, the leaked water will reach the connecting region 1125 through the tailing cover area 1121. The water reaching the connecting region 1125 will flow towards the casing 111 of the battery cell 11. By setting the minimum distance between the edges of the first and second orthographic projections, the second insulating member 113 can effectively shield the connecting region 1125, causing the water flowing into the connecting region 1125 to flow along the side of the second insulating member 113 away from the casing 111. This arrangement effectively extends the path of the water flowing through the connecting region 1125 to the surface of the casing 111, thereby further improving the insulation performance of the battery cell 11.

[0175] It should be noted that the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection can be 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 40 mm, 50 mm, etc.

[0176] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the multiple surfaces also include a third surface 1113, which is the surface with the largest area. The first surface 1111, the second surface 1112, and the third surface 1113 are arranged in pairs. When the battery cell 11 is disposed in the battery device 100, the third surface 1113 is configured as a sidewall facing the battery device 100. The first insulating member 112 covers the third surface 1113, and the second orthographic projection is disposed to avoid the third surface 1113.

[0177] Specifically, among the multiple surfaces of the battery cell 11, the third surface 1113 has the largest area and intersects with the second surface 1112. When the battery cell 11 is in use, it expands at the location of the third surface 1113. When the battery cell 11 is used in the battery device 100 and multiple battery cells 11 are grouped together within the battery device 100, the grouped battery cells 11 will expand at the location of the third surface 1113 during use. The second orthographic projection is positioned to avoid the third surface 1113, so that the second insulating member 113 can avoid the location of the third surface 1113 (i.e., in the direction perpendicular to the third surface 1113, the second insulating member 113 will not form an orthographic projection on the third surface 1113), reducing the space occupied by the second insulating member 113 outside the third surface 1113, thereby reducing the interference caused by the second insulating member 113 when the third surface 1113 expands.

[0178] It should be noted that the number of third surfaces 1113 can be one or more.

[0179] Furthermore, the casing 111 of the battery cell 11 can be either a prismatic or cylindrical structure. When the casing 111 of the battery cell 11 is a prismatic structure, there are two third surfaces 1113, and the two third surfaces 1113 are arranged opposite to each other. When the casing 111 of the battery cell 11 is a cylindrical structure, the second surface 1112 and the third surface 1113 together form the side wall of the cylindrical structure (the second surface 1112 and the third surface 1113 form a side wall).

[0180] In some embodiments of this application, such as Figure 3 and Figure 5 As shown, there are two second surfaces 1112 and two third surfaces 1113. The two second surfaces 1112 are arranged opposite each other along the first direction X, and the two third surfaces 1113 are arranged opposite each other along the second direction Y. The first direction X and the second direction Y intersect, and the first direction X and the second direction Y are parallel to the first surface 1111 respectively. At least one second surface 1112 is covered by a second orthographic projection, and the second orthographic projection covers at least a portion of the second surface 1112.

[0181] The second surface 1112 and the third surface 1113 include a first transition fillet 1114, and the first transition fillet 1114 and the third surface 1113 have a first transition portion 1115. The second orthographic projection is flush with or spaced apart from the first transition portion 1115.

[0182] Specifically, two second surfaces 1112 are arranged opposite each other along the first direction X, two third surfaces 1113 are arranged opposite each other along the second direction Y, and the first surface 1111 is located at the bottom of the housing 111 along the third direction Z. The first surface 1111, the second surface 1112, and the third surface 1113 are arranged in pairs. Among them, one of the first direction X and the second direction Y is the length direction of the battery cell 11, the other is the width direction of the battery cell 11, and the third direction Z is the height direction of the battery cell 11.

[0183] When the battery cell 11 is used in the battery device 100, the battery cell 11 is disposed inside the battery device 100. The first surface 1111 is disposed facing the bottom of the battery device 100, and the second surface 1112 and the third surface 1113 are disposed facing the side of the battery device 100. The first insulating member 112 on the battery cell 11 is disposed on the outside of the battery cell 11 by covering. The tail covering area 1121 of the first insulating member 112 can be disposed only in the position opposite to the second surface 1112. A second insulating member 113 is disposed on one side of the second surface 1112. The second insulating member 113 is used to block the connecting area 1125 of the tail covering area 1121 disposed opposite to the second surface 1112, so as to extend the flow path of the water entering through the connecting area 1125.

[0184] The second surface 1112 and the third surface 1113 intersect and are connected to each other. A first transition fillet 1114 is provided between the third surface 1113 and the second surface 1112 to improve the ease of processing.

[0185] The first transition fillet 1114 is a quarter-circle arc, and the first transition portion 1115 is one end of the quarter-circle arc. The first transition portion 1115 is a straight line along the third direction Z. The second orthographic projection of the second insulating member 113 on the outer surface of the housing 111 is set to be flush with or spaced apart from the first transition portion 1115. This allows the second insulating member 113 to improve the blocking effect on the connecting area 1125 by setting its position, while avoiding the location of the third surface 1113. This extends the time for the liquid to enter through the connecting area 1125, thereby further improving the insulation performance of the battery cell 11.

[0186] It should be noted that the casing 111 of the battery cell 11 also includes a fourth surface 1116. The fourth surface 1116 is disposed opposite to the first surface 1111 along a third direction Z (i.e., the height direction of the battery cell 11). The first surface 1111, two second surfaces 1112, two third surfaces 1113, and the fourth surface 1116 form a square shell structure of the casing 111. The battery cell 11 also includes electrode terminals 1117. The number of electrode terminals 1117 can be one or more. When there are multiple electrode terminals 1117, the multiple electrode terminals 1117 can be disposed on the same surface or on different surfaces. For example, there are two electrode terminals 1117, both of which are disposed on the fourth surface 1116, and the two electrode terminals 1117 are spaced apart.

[0187] Furthermore, the first insulating member 112 is disposed on the outside of the housing 111 by covering it. The first insulating member 112 may or may not cover the surface with the electrode terminals 1117. For example, the fourth surface 1116 has the electrode terminals 1117, and the first insulating member 112 is covered on the first surface 1111, the two second surfaces 1112, and the two third surfaces 1113. The covering method of the first insulating member 112 includes U-shaped covering or annular covering. When the first insulating member 112 is U-shaped (the first insulating member 112 is U-shaped), the first insulating member 112 forms a U-shaped structure on one side of the two third surfaces 1113 and the first surface 1111, and a tail-end covering area 112 is formed at the corresponding position on each second surface 1112. 1; When the first insulating member 112 is in an annular covering manner (the first insulating member 112 is arranged in an annular shape), the first insulating member 112 forms an annular structure on one side of the two second surfaces 1112 and the two third surfaces 1113, and forms an overlapping area at the opposite position of one second surface 1112 (the opposite ends of the first insulating member 112 are spliced ​​together by butt joint, and the position where the two ends overlap is called the overlapping area), and the end covering is performed at the opposite position of the first surface 1111, wherein the overlapping area and the end covering part together constitute the end covering area 1121.

[0188] In some embodiments of this application, such as Figures 4 to 7As shown, the first insulating member 112 is U-shaped and surrounds the first surface 1111 and two third surfaces 1113. The tail covering area 1121 is disposed on the second surface 1112. In the two second surfaces 1112, at least a portion of each second surface 1112 is covered by the second orthographic projection. The tail covering area 1121 includes two first tail covering portions 1122. Each second surface 1112 is provided with a first tail covering portion 1122 opposite to each other. The connecting area 1125 includes two first connecting portions. Each first tail covering portion 1122 is provided with a first connecting portion opposite to each other.

[0189] The first finishing covering portion 1122 includes a first folding structure 1123, the first folding structure 1123 includes a first crease 1124, the first crease 1124 and the first connecting portion are both located inside the first folding structure 1123, and the first connecting portion is connected to the outside through the first crease 1124.

[0190] Specifically, the first insulating member 112 is arranged sequentially around a third surface 1113, a first surface 1111, and another third surface 1113 to form a U-shaped structure. Tail-end covering areas 1121 are formed at the opposite positions of the two second surfaces 1112, so that the remaining body of the first insulating member 112 is housed in the tail-end covering area 1121, thereby reducing the occupation of the external space of the battery cell 11 by the first insulating member 112 and helping to reduce the overall volume of the battery cell 11.

[0191] The finishing covering area 1121 includes two independently arranged first finishing covering portions 1122. One second surface 1112 is provided with one first finishing covering portion 1122, and the other second surface 1112 is provided with another first finishing covering portion 1122. Each first finishing covering portion 1122 is formed by splicing part of the main body and folding part of the main body. Each first finishing portion is provided with a first connecting portion, and the outside can be connected to the casing 111 of the battery cell 11 through the first connecting portion.

[0192] The first insulating member 112 is a membrane-like member, and its shape conforms to that of the housing 111 (i.e., its shape matches the outer contour of the housing 111). Partial body splicing refers to overlapping different edges of the first insulating member 112, with the overlapping areas fixed by adhesive bonding. Partial body folding refers to forming a layered structure by bending the remaining portion of the first insulating member 112 on one side of the second surface 1112, with the layering direction perpendicular to the second surface 1112.

[0193] The first finishing covering portion 1122 includes a first folding structure 1123, which is formed by folding a portion of the body of the first insulating member 112. The first folding structure 1123 includes multiple creases, among which the first crease 1124 is included. The first connecting portion is connected to the outside through the first crease 1124.

[0194] The first crease 1124 is used to increase the path of water flowing from the outside to the connecting area 1125, and the second insulating member 113 is provided to extend the path of water flowing from the connecting area 1125 to the surface of the housing 111. This arrangement further extends the path of water flowing from the outside to the surface of the housing 111, thereby further improving the insulation performance of the battery cell 11.

[0195] In some embodiments of this application, such as Figure 5 As shown, the first crease 1124 is parallel to the second surface 1112, and the first surface 1111, the second surface 1112 and the third surface 1113 have intersecting positions. The first insulating member 112 includes a folded corner position, which is arranged opposite to the intersecting position. One end of the first crease 1124 is connected to the folded corner position, and the other end of the first crease 1124 is inclined to the side away from the first surface 1111 and connected to the first communicating portion.

[0196] Specifically, two second surfaces 1112 are arranged opposite each other along the first direction X, two third surfaces 1113 are arranged opposite each other along the second direction Y, and the first surface 1111 is located at the bottom of the housing 111 along the third direction Z. The first surface 1111, the second surface 1112, and the third surface 1113 are arranged in pairs. Among them, one of the first direction X and the second direction Y is the length direction of the battery cell 11, the other is the width direction of the battery cell 11, and the third direction Z is the height direction of the battery cell 11.

[0197] When the battery cell 11 is used in the battery device 100, the battery cell 11 is disposed inside the battery device 100, the first surface 1111 is disposed facing the bottom of the battery device 100, the second surface 1112 and the third surface 1113 are disposed facing the side of the battery device 100, the corner position is located at the bottom of the battery device 100, and the first connecting part is connected to the outside through the first crease 1124.

[0198] The first crease 1124 is set at an angle (i.e., one end of the first crease 1124 is connected to the corner position, and the other end of the first crease 1124 is set at an angle away from the first surface 1111), thereby increasing the length of the first crease 1124, which can further extend the path from the outside to the first connecting part, so that the path of water liquid from the outside to the surface of the casing 111 is extended, thereby further improving the insulation performance of the battery cell 11.

[0199] It should be noted that the first crease 1124 is inclined relative to the first surface 1111, and the included angle between the two can be 30 degrees, 45 degrees, 60 degrees, 75 degrees or 90 degrees, etc.

[0200] In some embodiments of this application, such as Figures 8 to 12 As shown, the first insulating member 112 is arranged in a ring shape, and the first insulating member 112 surrounds two second surfaces 1112 and two third surfaces 1113. At least a portion of one of the second surfaces 1112 is covered by a second orthographic projection. The tailing covering area 1121 includes a second tailing covering portion 1127. The second surface 1112 covered by the second orthographic projection is arranged opposite to the second tailing covering portion 1127.

[0201] The connected region 1125 includes a second connected portion, and the second closing covering portion 1127 includes an overlapping region. The second connected portion is located within the overlapping region and is connected to the outside through the overlapping region.

[0202] Specifically, when the first insulating member 112 is in an annular covering manner (the first insulating member 112 is arranged in an annular shape), the first insulating member 112 forms an annular structure on one side of the two second surfaces 1112 and the two third surfaces 1113, and forms a second tail covering portion 1127 at a position opposite to one of the second surfaces 1112, so that the remaining body of the first insulating member 112 is housed in the second tail covering portion 1127, thereby reducing the occupation of the external space of the battery cell 11 by the first insulating member 112 and helping to reduce the overall volume of the battery cell 11.

[0203] The first insulating element 112 is a film-like element, and it is conformally arranged to the outer contour of the housing 111 (i.e., its shape is consistent with the outer contour of the housing 111). The second finishing covering portion 1127 includes an overlapping area, which means that the different edges of the first insulating element 112 are arranged together by overlapping. The overlapping position can be fixed by electrostatic adsorption or other means, and the direction of the overlap is perpendicular to the second surface 1112.

[0204] It is important to understand that the overlapping area is a rectangular structure, and the length of the rectangular structure is set along the third direction Z (i.e., the height direction of the battery cell 11).

[0205] By utilizing the overlapping area to increase the path of water flowing from the outside to the connecting area 1125, and by setting the second insulating member 113, the path of water flowing from the connecting area 1125 to the surface of the housing 111 is extended. This arrangement further extends the path of water flowing from the outside to the surface of the housing 111, thereby further improving the insulation performance of the battery cell 11.

[0206] In some embodiments of this application, such as Figures 3 to 10 As shown, the finishing covering area 1121 also includes a third finishing covering portion 1128, which is disposed opposite to the first surface 1111, and the second orthographic projection covers at least a portion of the first surface 1111. The connecting area 1125 also includes a third connecting portion, and the third finishing covering portion 1128 includes a second folding structure 1129, which includes a second crease 1130. The second crease 1130 and the third connecting portion are both disposed within the second folding structure 1129, and the third connecting portion is connected to the outside through the second crease 1130.

[0207] Specifically, when the first insulating member 112 is in a ring-shaped covering manner (the first insulating member 112 is arranged in a ring), the first insulating member 112 forms a ring structure on one side of the two second surfaces 1112 and the two third surfaces 1113, and forms a second tail covering portion 1127 at a position opposite to one of the second surfaces 1112, and forms a third tail covering portion 1128 at a position corresponding to the first surface 1111, so that the remaining body of the first insulating member 112 is respectively housed in the positions of the second tail covering portion 1127 and the third tail covering portion 1128, thereby reducing the occupation of the external space of the battery cell 11 by the first insulating member 112 and helping to reduce the overall volume of the battery cell 11.

[0208] The third finishing covering portion 1128 includes a second folding structure 1129, which is formed by folding a portion of the body of the first insulating member 112. The second folding structure 1129 includes multiple creases, among which a second crease 1130 is included. The third connecting portion is connected to the outside through the second crease 1130.

[0209] The second crease 1130 is used to increase the path of water flowing from the outside to the connecting area 1125, and the second insulating member 113 is provided to extend the path of water flowing from the connecting area 1125 to the surface of the housing 111. This arrangement further extends the path of water flowing from the outside to the surface of the housing 111, thereby further improving the insulation performance of the battery cell 11.

[0210] In this application, if Figure 10As shown, the third connecting portion is connected to the outside through the second crease 1130. The second crease 1130 can be inclined relative to the second surface 1112 or the third surface 1113. By setting the second crease 1130 to be inclined (i.e., one end of the second crease 1130 is connected to the corner position, and the other end of the second crease 1130 is inclined to the side away from the second surface 1112 or the third surface 1113), the length of the second crease 1130 is increased, which can further extend the path from the outside to the third connecting portion, so that the path of water from the outside to the surface of the casing 111 is extended, thereby further improving the insulation performance of the battery cell 11.

[0211] For example, the second crease 1130 is inclined relative to the second surface 1112, and the included angle between the two can be 30 degrees, 45 degrees, 60 degrees, 75 degrees or 90 degrees, etc.

[0212] In some embodiments of this application, such as Figure 11 and Figure 12 As shown, a second transition fillet 1118 is included between the first surface 1111 and the third surface 1113. A second transition portion 1119 is provided between the second transition fillet 1118 and the third surface 1113. The second orthographic projection is flush with or spaced apart from the second transition portion 1119.

[0213] Specifically, two second surfaces 1112 are arranged opposite each other along the first direction X, two third surfaces 1113 are arranged opposite each other along the second direction Y, and the first surface 1111 is located at the bottom of the housing 111 along the third direction Z. The first surface 1111, the second surface 1112, and the third surface 1113 are arranged in pairs. Among them, one of the first direction X and the second direction Y is the length direction of the battery cell 11, the other is the width direction of the battery cell 11, and the third direction Z is the height direction of the battery cell 11.

[0214] When the battery cell 11 is used in the battery device 100, the battery cell 11 is disposed inside the battery device 100. The first surface 1111 is disposed facing the bottom of the battery device 100, and the second surface 1112 and the third surface 1113 are disposed facing the side of the battery device 100. The first insulating member 112 on the battery cell 11 is disposed on the outside of the battery cell 11 by covering. The tail covering area 1121 of the first insulating member 112 can be disposed at a position opposite to a second surface 1112 and at a position opposite to the first surface 1111. A second insulating member 113 is disposed on one side of the first surface 1111 and a second surface 1112. The second insulating member 113 is used to block the connecting portion disposed opposite to the first surface 1111 and the second surface 1112, so as to extend the flow path of the water entering through the connecting area 1125.

[0215] The first surface 1111 and the third surface 1113 intersect and are connected to each other. A first transition fillet 1114 is provided between the first surface 1111 and the third surface 1113 to improve the ease of processing.

[0216] The second transition fillet 1118 is a quarter-circle arc, and the second transition portion 1119 is one end of the quarter-circle arc. The second transition portion 1119 is a straight line along the first direction X. The second orthographic projection of the second insulating member 113 on the outer surface of the housing 111 is set to be flush with or spaced apart from the second transition portion 1119. This allows the second insulating member 113 to improve its blocking effect on the connecting region 1125 while avoiding the location of the third surface 1113. This extends the time for the liquid to enter through the connecting region 1125, further improving the insulation performance of the battery cell 11.

[0217] A second aspect of this application provides a battery device 100, which includes a battery cell 11 as described above.

[0218] In this application, the battery cell 11 of the battery device 100 has a second insulating member 113 disposed between the first insulating member 112 and the housing 111. The first orthographic projection of the connecting region 1125 is set within the range of the second orthographic projection of the second insulating member 113, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member 113 can be used to block the connection between the housing 111 and the connecting region 1125. When water leakage occurs outside the battery cell 11, after the water reaches the position of the connecting region 1125, the second insulating member 113 blocks the water from flowing through the connecting region 1125 to the surface of the housing 111, thereby reducing the possibility of water contacting the housing 111 of the battery cell 11 and improving the insulation performance of the battery cell 11.

[0219] A third aspect of this application provides an electrical device comprising a battery device 100 as described above.

[0220] In this application, the battery cell 11 of the battery device 100 in the electrical equipment has a second insulating member 113 disposed between the first insulating member 112 and the housing 111. The first orthographic projection of the connecting region 1125 is set within the range of the second orthographic projection of the second insulating member 113, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. In this way, the second insulating member 113 can be used to block the connection between the housing 111 and the connecting region 1125. When water leaks from the outside of the battery cell 11, after the water reaches the position of the connecting region 1125, the second insulating member 113 blocks the water from flowing through the connecting region 1125 to the surface of the housing 111, thereby reducing the possibility of water contacting the housing 111 of the battery cell 11 and improving the insulation performance of the battery cell 11.

[0221] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0222] In the embodiments of this application, such as Figures 3 to 12 As shown, this application proposes a battery cell 11 for use in a battery device 100. The battery cell 11 includes a housing 111, a first insulating member 112, and a second insulating member 113. The housing 111 has multiple surfaces, including a first surface 1111 and a second surface 1112, which intersect. When the battery cell 11 is disposed within the battery device 100, the first surface 1111 is configured to face the bottom of the battery device 100. The first insulating member 112 covers the outside of the housing 111 and covers the first surface 1111 and the second surface 1112. The first insulating member 112 has a tapering coverage area 1121. 21 is disposed opposite to at least one of the first surface 1111 and the second surface 1112. The tail covering area 1121 has a connecting region 1125, which can connect the outside world with the outer surface of the housing 111. The second insulating member 113 is disposed between the housing 111 and the first insulating member 112. The connecting region 1125 has a first orthographic projection on the outer surface of the housing 111, and the second insulating member 113 has a second orthographic projection on the outer surface of the housing 111. The first orthographic projection is located within the second orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero.

[0223] In this application, a second insulating member 113 is provided between the first insulating member 112 and the housing 111. The first orthographic projection of the connecting region 1125 is set within the range of the second orthographic projection of the second insulating member 113, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than zero. Thus, the second insulating member 113 can be used to block the connection between the housing 111 and the connecting region 1125. When water leakage occurs outside the battery cell 11, after the water reaches the position of the connecting region 1125, the path of the water flowing from the connecting region 1125 to the outer surface of the housing 111 is lengthened due to the obstruction of the second insulating member 113, reducing the possibility of water contacting the housing 111 of the battery cell 11 and improving the insulation performance of the battery cell 11.

[0224] Furthermore, at least one of the first insulating member 112 and the housing 111 is connected to the second insulating member 113. The second insulating member 113 includes an insulating film. The second insulating member 113 includes an insulating coating. The thickness of the second insulating member 113 ranges from 10 micrometers to 200 micrometers.

[0225] Furthermore, the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than or equal to 15 millimeters.

[0226] Furthermore, the plurality of surfaces also includes a third surface 1113, which is the surface with the largest area. The first surface 1111, the second surface 1112, and the third surface 1113 are arranged in pairs. When the battery cell 11 is disposed within the battery device 100, the third surface 1113 is configured to face the side of the battery device 100. The first insulating member 112 covers the third surface 1113, and the second orthographic projection is disposed to avoid the third surface 1113. There are two second surfaces 1112 and two third surfaces 1113. The two second surfaces 1112 are arranged opposite each other along the first direction X, and the two third surfaces 1113 are arranged opposite each other along the second direction Y. The first direction X and the second direction Y intersect, and the first direction X and the second direction Y are parallel to the first surface 1111, respectively. At least one second surface 1112 is covered by the second orthographic projection, and the second orthographic projection covers at least a portion of the second surface 1112. The second surface 1112 and the third surface 1113 include a first transition fillet 1114, and the first transition fillet 1114 and the third surface 1113 have a first transition portion 1115. The second orthographic projection is flush with or spaced apart from the first transition portion 1115.

[0227] Furthermore, the first insulating member 112 is U-shaped and surrounds the first surface 1111 and two third surfaces 1113. A tail-end covering region 1121 is disposed on the second surface 1112. At least a portion of each second surface 1112 is covered by a second orthographic projection. The tail-end covering region 1121 includes two first tail-end covering portions 1122, with one first tail-end covering portion 1122 disposed opposite to each second surface 1112. The connecting region 1125 includes two first connecting portions, with one first connecting portion disposed opposite to each first tail-end covering portion 1122. The first tail-end covering portion 1122 includes a first fold structure 1123, which includes a first crease 1124. Both the first crease 1124 and the first connecting portion are disposed within the first fold structure 1123, and the first connecting portion communicates with the outside through the first crease 1124. The first crease 1124 is parallel to the second surface 1112. The first surface 1111, the second surface 1112 and the third surface 1113 have intersecting positions. The first insulating member 112 includes a folded corner position, which is arranged opposite to the intersecting position. One end of the first crease 1124 is connected to the folded corner position, and the other end of the first crease 1124 is inclined to the side away from the first surface 1111 and connected to the first communicating portion.

[0228] Furthermore, the first insulating member 112 is arranged in a ring shape, surrounding two second surfaces 1112 and two third surfaces 1113. At least a portion of one of the second surfaces 1112 is covered by a second orthographic projection. The termination covering region 1121 includes a second termination covering portion 1127, with the second surface 1112 covered by the second orthographic projection and the second termination covering portion 1127 being disposed opposite each other. The connecting region 1125 includes a second connecting portion, and the second termination covering portion 1127 includes an overlapping region. The second connecting portion is located within the overlapping region and is connected to the outside through the overlapping region. The termination covering region 1121 also includes a third termination covering portion 1128, which is disposed opposite to the first surface 1111, and the second orthographic projection covers at least a portion of the first surface 1111. The connecting region 1125 also includes a third connecting portion. The third tail covering portion 1128 includes a second folding structure 1129. The second folding structure 1129 includes a second crease 1130. The second crease 1130 and the third connecting portion are both located within the second folding structure 1129, and the third connecting portion is connected to the outside through the second crease 1130. A second transition fillet 1118 is included between the first surface 1111 and the third surface 1113. A second transition portion 1119 is provided between the second transition fillet 1118 and the third surface 1113. The second orthographic projection is flush with or spaced apart from the second transition portion 1119.

[0229] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell for use in a battery device, characterized by, The battery cell comprises: a housing having a plurality of surfaces, the plurality of surfaces including a first surface and a second surface, the first surface intersecting the second surface, the first surface being configured to face a bottom of the battery device when the battery cell is disposed in the battery device; a first insulating member wrapped outside the housing and covering the first surface and the second surface, the first insulating member having a tail wrapping region oppositely arranged with at least one of the first surface and the second surface, the tail wrapping region having a communication area capable of communicating an external environment with an outer surface of the housing; a second insulating member disposed between the housing and the first insulating member, the communication area having a first orthographic projection on the outer surface of the housing, the second insulating member having a second orthographic projection on the outer surface of the housing, the first orthographic projection being located within the second orthographic projection, and a minimum distance between an edge of the first orthographic projection and an edge of the second orthographic projection being greater than zero.

2. The battery cell of claim 1, wherein, At least one of the first insulating member and the housing is connected with the second insulating member.

3. The battery cell of claim 2, wherein, The second insulating member is connected with the housing, and the second insulating member comprises an insulating film or an insulating coating.

4. The battery cell of claim 1, wherein, A thickness of the second insulating member ranges from 10 microns to 200 microns.

5. The battery cell of claim 1, wherein, The minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is greater than or equal to 15 millimeters.

6. The battery cell of any one of claims 1 to 5, wherein, The plurality of surfaces further includes a third surface being a largest area surface, the first surface, the second surface and the third surface being arranged in pairs of intersection, the third surface being configured to face a side of the battery device when the battery cell is disposed in the battery device, wherein the first insulating member covers the third surface, and the second orthographic projection avoids the third surface.

7. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. The number of the second surface and the third surface is both two, the two second surfaces are oppositely arranged along a first direction, the two third surfaces are oppositely arranged along a second direction, the first direction intersects the second direction, and the first direction and the second direction are respectively parallel to the first surface, at least one of the second surfaces is covered by the second orthographic projection, and the second orthographic projection covers at least a portion of the second surface; A first transition fillet is included between the second surface and the third surface, and a first transition site is included between the first transition fillet and the third surface, the second orthographic projection is arranged flush with the first transition site or is spaced apart from the first transition site.

8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. The first insulation piece is arranged in a U shape, and surrounds the first surface and the two third surfaces. The tail covering area is arranged on the second surface, at least part of each second surface is covered by the second orthographic projection, and the tail covering area includes two first tail covering portions, one first tail covering portion is arranged opposite to each second surface. The communication area includes two first communication portions, one first communication portion is arranged opposite to each first tail covering portion. The first tail covering portion includes a first folding structure, the first folding structure includes a first crease, the first crease and the first communication portion are arranged in the first folding structure, and the first communication portion is in communication with the outside through the first crease.

9. The battery cell of claim 8, wherein the cathode comprises a lithium metal oxide. The first crease is parallel to the second surface, the first surface, the second surface and the third surface have an intersection position, the first insulation piece includes a folding corner position arranged opposite to the intersection position, one end of the first crease is connected to the folding corner position, and the other end of the first crease is arranged to incline to a side away from the first surface and is in communication with the first communication portion.

10. The battery cell as described in claim 7, characterized in that, The first insulation piece is arranged in a ring shape, and surrounds the two second surfaces and the two third surfaces. At least part of one second surface is covered by the second orthographic projection, and the tail covering area includes a second tail covering portion, the second surface covered by the second orthographic projection is arranged opposite to the second tail covering portion. The communication area includes a second communication portion, the second tail covering portion includes an overlapping area, the second communication portion is arranged in the overlapping area, and the second communication portion is in communication with the outside through the overlapping area.

11. The battery cell of claim 10, wherein the cathode comprises a lithium metal oxide. The tail covering area further includes a third tail covering portion, the third tail covering portion is arranged opposite to the first surface, and the second orthographic projection covers at least part of the first surface. The communication area further includes a third communication portion, the third tail covering portion includes a second folding structure, the second folding structure includes a second crease, the second crease and the third communication portion are arranged in the second folding structure, and the third communication portion is in communication with the outside through the second crease.

12. The battery cell of claim 11, wherein, The first surface and the third surface include a second transition fillet, the second transition fillet and the third surface have a second transition position, and the second orthographic projection is arranged flush with the second transition position or is arranged spaced apart from the second transition position.

13. A battery device characterized by comprising: The battery device includes the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized by The electric device includes the battery device according to claim 13.

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