Battery pack and powered device

Abstract

This application provides a battery pack and an electrical device including such a battery pack, wherein the battery pack includes a housing and a plurality of battery cells arranged therein along a stacking direction. Each battery cell's housing includes a fixing surface for fixing to a support plate of the housing by structural adhesive. The fixing surface includes a perforated area exposing the outer surface of the housing, a first insulating area covered with an insulating film, and a second insulating area covered with an insulating coating. The areas of the perforated area, the first insulating area, and the second insulating area in a base plane parallel to the fixing surface, with respect to their geometry, need to satisfy a defined failure sequence. This battery pack can have improved operational safety and reliability, and in particular, improved vibration and shock resistance.

Description

Technical Field

[0001] This application relates to the field of battery and energy storage technology, specifically to a battery pack and an electrical device having such a battery pack. Background Technology

[0002] Power batteries, such as automotive power battery packs, can be composed of a number of stacked battery cells connected in series and parallel. The casing of each battery cell is typically made of metal, and an insulating element may be provided on the outside of each battery cell's casing to maintain insulation between adjacent battery cells and between the battery cell and surrounding devices. For example, a battery cell is known from the prior art to have an insulating film on the outer surface of its casing, and the outer surface with the insulating film is then adhered to the bottom plate of the housing.

[0003] It is worth looking forward to modifying the individual battery cells contained in the battery pack to further improve the battery pack in terms of manufacturing process or safety of use.

[0004] It should be noted that the content described herein is only to provide background information in relation to this disclosure and does not necessarily belong to the prior art. Utility Model Content

[0005] Depending on the specific aspects, the purpose of this invention is to provide an improved battery pack and electrical equipment, wherein the battery pack can have improved operational safety and reliability.

[0006] In addition, this application aims to solve or alleviate other technical problems existing in the prior art.

[0007] According to a first aspect of this application, a battery pack is provided, comprising a housing and a plurality of battery cells arranged therein along a stacking direction. The housing of each battery cell includes a fixing surface for fixing to a support plate of the housing by structural adhesive. The fixing surface includes a perforated area exposing the outer surface of the housing, a first insulating area covered with an insulating film, and a second insulating area covered with an insulating coating.

[0008] The geometric shapes of the hollow area, the first insulating area, and the second insulating area, and the areas they occupy, satisfy the following relationship:

[0009]

[0010] Wherein, σ1 is the tensile strength of the first insulating zone bonded to the bearing plate;

[0011] A1 is the area of ​​the first insulating region;

[0012] σ2 is the tensile strength of the hollowed-out area bonded to the support plate;

[0013] A2 is the area of ​​the hollowed-out area;

[0014] σ3 is the tensile strength of the second insulation zone bonded to the bearing plate;

[0015] A3 represents the area of ​​the second insulating region.

[0016] In the battery pack proposed according to the first aspect of this application, optionally, the areas of the hollow area, the first insulating area, and the second insulating area also satisfy the following relationship:

[0017]

[0018] Where τ is the equivalent shear strength;

[0019] τ1 is the shear strength of the first insulating zone bonded to the bearing plate;

[0020] A1 is the area of ​​the first insulating region;

[0021] τ2 is the shear strength of the hollowed-out area bonded to the support plate;

[0022] A2 is the area of ​​the hollowed-out area;

[0023] τ3 is the shear strength of the second insulating zone bonded to the bearing plate;

[0024] A3 represents the area of ​​the second insulating region.

[0025] In the battery pack proposed according to the first aspect of this application, optionally, the area of ​​the hollow area, the first insulating area and the second insulating area is configured such that, when the fixed surface is bonded to the carrier plate by structural adhesive, the equivalent resistance of the hollow area, the first insulating area and the second insulating area is at least 10MΩ.

[0026] In the battery pack proposed according to the first aspect of this application, optionally, the thickness of the insulating film is 20μm-200μm;

[0027] And / or, the thickness of the insulating coating is 20μm-250μm;

[0028] And / or, the thickness of the structural adhesive is 0.1mm-2mm.

[0029] In the battery pack proposed according to the first aspect of this application, optionally, a limiting strip is provided on the area of ​​the carrier plate corresponding to the hollow area, wherein the hollow area is fixed to the limiting strip by structural adhesive.

[0030] In the battery pack proposed according to the first aspect of this application, optionally, the limiting strip extends along the stacking direction and is simultaneously fixed to the hollow areas of a plurality of battery cells.

[0031] In the battery pack proposed according to the first aspect of this application, optionally, the first insulating region extends circumferentially in the edge region of the fixed surface and surrounds the hollow region and the second insulating region externally.

[0032] In the battery pack proposed according to the first aspect of this application, optionally, the two opposite boundaries of the hollowed-out area in the stacking direction are each defined by the boundary of the first insulating area.

[0033] In the battery pack proposed according to the first aspect of this application, optionally, the housing of the battery cell further includes a side surface perpendicular to and in contact with the fixing surface, and an insulating film is provided on the side surface, which is integral with the insulating film on the fixing surface.

[0034] According to a second aspect of this application, an electrical device comprising the battery pack described above is also proposed, which may have the features described above.

[0035] The proposed battery pack offers improved operational safety and reliability, particularly enhanced resistance to vibration and shock. Attached Figure Description

[0036] Referring to the accompanying drawings, the above and other features of this utility model will become apparent, wherein,

[0037] Figure 1 A perspective view of the battery cells included in a battery pack according to one embodiment of this application is shown;

[0038] Figure 2 This shows, from another perspective, that according to Figure 1 The battery cells. Detailed Implementation

[0039] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0040] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," "third," and similar expressions are used for descriptive and distinguishing purposes only and should not be construed as indicating or implying the relative importance of the corresponding components.

[0041] Typically, the individual cells in a battery pack need to have good insulation strength and reliable fixing strength in the enclosure. Therefore, how to achieve both simultaneously has been a topic of ongoing discussion.

[0042] It should be noted that the battery pack mentioned in this disclosure is a unit or assembly having a certain number of battery cells that are electrically connected to each other. For example, the certain number of battery cells can be assembled into a battery pack using CTM (Cell to Module) technology, CTP (Cell to Pack) technology, or CTC (Cell to Chassis) technology. The battery pack can be a high-voltage battery pack or a low-voltage battery pack, which is not limited in the embodiments of this application.

[0043] Next, it should be noted that the battery pack mentioned in this disclosure includes a battery cell with the following structure: an outer casing and an internal cell assembly housed within the casing. The battery cell may be, but is not limited to, a lithium-ion battery cell, such as a primary lithium-ion battery or a secondary lithium-ion battery. Furthermore, the battery cell may be, but is not limited to, a prismatic battery cell or a cylindrical battery cell. Specifically, in a prismatic battery cell, a positive electrode and a negative electrode are provided on the same side or wall of the cell, i.e., arranged adjacent to each other. Alternatively, in the prismatic battery, the positive electrode and the negative electrode are separately located on opposite sides or walls, i.e., they are opposite each other, such as a blade battery, such as a short blade battery or a long blade battery. In the cylindrical battery cell, the side surface of its casing is a circular surface.

[0044] Furthermore, it should be noted that the electrical equipment mentioned in this disclosure refers to equipment that has an energy storage device and an electrical consumer that requires electrical energy to be supplied by the energy storage device. For example, the electrical equipment may be, but is not limited to, new energy vehicles, including pure electric vehicles and hybrid electric vehicles.

[0045] according to Figure 1 and Figure 2The images show, from different angles, the battery cells 100 included in a battery pack according to one embodiment. The cells are square batteries, and the cell assembly is mainly composed of positive and negative electrodes of opposite polarity and an insulating element optionally located therebetween, stacked or wound. The casing may be made of aluminum and filled with electrolyte.

[0046] As can be seen from the figure, the casing of the battery cell includes a fixing surface 110 (which is located in...). Figure 1 From a certain perspective, the top surface 120 and the side surface 130 are the bottom surface and the top surface 120. The top surface 120 is along the thickness direction of the fixed surface 110 (i.e., the Z direction). Figure 1 The side surface 130 (represented by double arrows) is opposite to the fixed surface 110; the side surface 130 is connected to the fixed surface 110 and the top surface 120 at both ends respectively; the fixed surface 110, the top surface 120 and the side surface 130 together form a cavity in which the above-mentioned battery cell assembly is accommodated and sealed.

[0047] Two terminals 121, corresponding to the internal battery cell assembly, are simultaneously disposed on the top surface 120, where an explosion-proof valve 122 is also provided. Here, the top surface 120 can also be referred to as a cover plate, which is constructed separately from the side surface 130. For example, the battery cell assembly can be inserted from the side where the cover plate is located into the space defined by the fixed surface 110 and the side surface 130, and then the battery cell assembly is enclosed in the space by connecting the cover plate to the side surface 130, for example, by welding.

[0048] During the manufacturing process of the battery pack, multiple battery cells 100 are stacked along the stacking direction (i.e., the X direction). Figure 1 The cells (represented by double arrows) are arranged and fixed within the housing. Specifically, they are fixed to the support plate of the housing via (insulating) structural adhesive using fixing surfaces 110. In some embodiments, the battery cells 100 are bonded to the lower or upper support plate via fixing surfaces 110, wherein the support plate may be a heat exchange plate, such as a water-cooled plate. In some embodiments, the housing of the battery pack may be completely independent of the electrical device, i.e., the battery pack is installed into the electrical device after assembly. In other embodiments, taking a car as an example, a part of the car chassis may form part of the housing; for example, a part of the car floor is part of the housing.

[0049] from Figure 2As can be seen, the fixing surface 110 of the battery cell 100 is divided into a first insulating region 111, a hollowed-out region 112, and a second insulating region 113. That is, the first insulating region 111 and the second insulating region 113 occupy the area excluding the hollowed-out region 112. In the first insulating region 111, the outer surface of the metal casing of the battery cell is covered with an insulating film, which is in contact with the structural adhesive used for fixing. In the hollowed-out region 112, the outer surface of the metal casing is exposed and in direct contact with the structural adhesive. In the second insulating region 113, the outer surface of the metal casing is covered with an insulating coating, which is in contact with the structural adhesive. Through the above-mentioned division of the fixing surface 110, it is possible to simultaneously meet the requirements of insulation strength, fixing strength with the casing, and cost.

[0050] The term "outer surface" of the housing or its components, as used herein, refers to the side facing away from the internal cell assembly. In some embodiments, the insulating film and the insulating coating are mated, meaning their boundaries coincide. In other embodiments, the insulating film and the insulating coating have a slight overlap, wherein the area is designated as a first insulating region or a second insulating region based on the outermost insulating material that is in direct contact with the structural adhesive. For example, if the insulating film is the outermost layer and in direct contact with the structural adhesive in this overlap, the area in question is designated as the first insulating region.

[0051] exist Figure 2 In the illustrated embodiment, specifically, the first insulating region 111 extends circumferentially along the edge region of the fixing surface 110 and externally surrounds the cutout region 112 and the second insulating region 113. The insulating film on the first insulating region 111 is integral with the insulating film 131 on the side surface 130; that is, the insulating film 131 on the side surface 130 extends across the arcuate transition region between the lower edge of the side surface 130 and the fixing surface 110 to the fixing surface 110. The integral insulating film on both the side surface and the fixing surface simplifies the wrapping process and ensures sufficient insulation strength at the transition region.

[0052] In addition, Figure 2 In the illustrated embodiment, the cutout area 112 is located on two opposite end regions of the fixed surface 110 along the Y direction. The two opposite boundaries of the cutout area along the X direction are defined by the boundary of the first insulating area 111 or the insulating film thereon, in other words, they overlap. The two opposite boundaries of the cutout area 112 along the Y direction are defined by the boundary of the second insulating area 113 or the insulating coating thereon.

[0053] The insulating film and the insulating coating differ in their insulating materials and manufacturing processes. For example, the insulating film may include, but is not limited to, PET (polyethylene terephthalate) film, PP (polypropylene) film, or PVC (polyvinyl chloride) film, which can be adhered to a metal casing, and the thickness of the insulating film is 20μm-200μm; while the insulating coating may include, but is not limited to, acrylic resin, epoxy resin, or polyurethane resin, which can be applied to the metal casing by spraying, inkjet printing, or 3D printing of the insulating material and then cured, especially photocured (e.g., ultraviolet light curing), and the thickness of the insulating coating is 20μm-250μm.

[0054] Considering that the battery cell 100 in the battery pack will be subjected to tensile stress perpendicular to the connection interface in practical applications, the geometry of the first insulating area 111, the hollow area 112 and the second insulating area 113 of the fixed surface 110 needs to be designed reasonably.

[0055] In some embodiments, the areas of the first insulating region 111, the hollowed-out region 112, and the second insulating region 113 in the XY plane satisfy the following relationship:

[0056]

[0057] Wherein, σ1 is the tensile strength of the first insulating region 111 bonded to the bearing plate;

[0058] A1 is the area of ​​the first insulating region 111;

[0059] σ2 is the tensile strength of the hollow area 112 bonded to the support plate;

[0060] A2 represents the area of ​​the hollowed-out area 112;

[0061] σ3 is the tensile strength of the second insulating region 113 bonded to the bearing plate;

[0062] A3 represents the area of ​​the second insulation region 113.

[0063] A1, A2, and A3 are areas on the base surface (such as the XY plane shown in the accompanying drawings) of the fixed surface 110 of the housing, which can be expressed, for example, as a percentage of the total area of ​​the fixed surface 110. For example, in the case where multiple cutout areas 112 are provided, A2 is the total area of ​​the multiple cutout areas.

[0064] σ1, σ2, and σ3 are related to the properties of the structural adhesive itself, the amount of adhesive (i.e., the thickness and area of ​​the structural adhesive), and the properties of the materials bonded to the structural adhesive. In some embodiments, the thickness of the structural adhesive is 0.1 mm to 2 mm, particularly 0.1 mm to 0.5 mm. σ1, σ2, and σ3 are fixed values ​​or can be considered fixed values ​​when the structural adhesive, insulating film, and insulating coating are given.

[0065] σ1 is the tensile strength corresponding to the failure of the connection interface of the first insulating region 111 when the fixed surface 110 is bonded to the carrier plate with structural adhesive. The connection interface includes the connection interface between the insulating film of the first insulating region 111 and the outer surface of the fixed surface 110, and the connection interface between the insulating film and the structural adhesive. Here, σ1 can be measured by a tensile test perpendicular to the fixed surface 110. If the connection interface between the insulating film and the outer surface of the fixed surface fails first, the corresponding tensile strength is σ1; conversely, if the connection interface between the insulating film and the structural adhesive fails first, the corresponding tensile strength is σ1.

[0066] σ2 is the tensile strength at which the connection interface of the hollow area 112 fails when the fixed surface 110 is bonded to the support plate with structural adhesive. The connection interface is the interface between the exposed outer surface of the shell and the structural adhesive. σ2 can be measured by a tensile test perpendicular to the fixed surface 110.

[0067] σ3 is the tensile strength corresponding to the failure of the connection interface of the second insulation region 113 when the fixed surface 110 is bonded to the carrier plate with structural adhesive. The connection interface includes the connection interface between the insulating coating of the second insulation region 113 and the outer surface of the fixed surface 110, and the connection interface between the insulating coating and the structural adhesive. σ3 can be measured by a tensile test perpendicular to the fixed surface 110. If the connection interface between the insulating coating and the outer surface of the fixed surface fails first, the corresponding tensile strength is σ3; conversely, if the connection interface between the insulating coating and the structural adhesive fails first, the corresponding tensile strength is σ3.

[0068] From the above relationship (1), it can be deduced that the overall failure order of the fixing surface 110 of the battery cell is as follows: the first insulating region 111 (covered with an insulating film), the hollow region 112, and the second insulating region 113 (covered with an insulating coating). Compared to determining the geometry of each region of the fixing surface based on the total adhesive strength of each region, this implementation method of designing the geometry based on the determined tensile failure order is more in line with actual application scenarios. In addition, this implementation method of designing the geometry based on the determined tensile failure order can simultaneously ensure the tensile strength of the fixing surface as a whole and the necessary insulation strength.

[0069] Regarding the area A2 of the hollowed-out area 112 and the area A3 of the second insulating area 113, the following can be derived from the above relationship (1):

[0070]

[0071] Where σ2 and σ3 are fixed values ​​or can be considered fixed values, the area of ​​the hollowed-out area 112 should have a corresponding proportional relationship with respect to the geometry of the hollowed-out area.

[0072] It should be noted that this application aims to modify and improve the geometry of the individual battery cells contained in the battery pack, especially the geometry and structure of their fixing surfaces, while the corresponding materials and preparation methods of the insulating film, insulating coating, and structural adhesive can be determined in ways commonly found in the prior art.

[0073] Furthermore, regarding the geometry of the first insulating region 111, the hollow region 112, and the second insulating region 113, it should be noted that, where the corresponding area is determined based on the above relationship (1) or the relationship (3) which should be further explained below, or the equivalent resistance, its shape is not limited to the embodiments illustrated in the figures, and it may have any type of contour shape and / or occupy any feasible position on the fixed surface, provided that the manufacturing process is feasible.

[0074] In some embodiments, a limiting strip, made of, for example, PCM (Phase Change Material), is further provided on the mounting surface 110 of the housing's support plate facing the battery cell 100. This limiting strip ensures a minimum thickness of the structural adhesive between the battery cell's mounting surface and the support plate, thereby guaranteeing effective fixing strength. Figure 2 In the illustrated embodiment, two limiting strips may be provided, respectively located on two opposite end regions of the fixing surface 110 along the Y direction, to cover or at least cover the hollow area 112 thereon, which is directly fixed to the limiting strips by structural adhesive. As an optional embodiment, the limiting strips extend along the stacking direction (X direction) and are simultaneously fixed to the hollow area 112 of the fixing surface 110 of multiple battery cells 100 by structural adhesive.

[0075] Furthermore, in some embodiments, considering that the battery cells 100 in the housing will be subjected to shear stress parallel to the connection interface under vibration and shock conditions, the geometry of the first insulation area 111, the hollow area 112, and the second insulation area 113 needs to be reasonably designed. The areas A1, A2, and A3 corresponding to these three areas satisfy the following relationship:

[0076]

[0077] Where τ is the equivalent shear strength;

[0078] τ1 is the shear strength of the first insulating zone 111 bonded to the bearing plate;

[0079] τ2 is the shear strength of the hollow area 112 bonded to the bearing plate;

[0080] τ3 is the shear strength of the second insulating zone 113 bonded to the bearing plate.

[0081] Here, τ1, τ2, and τ3 relate to the properties of the structural adhesive itself, the amount of adhesive (i.e., the thickness and area of ​​the structural adhesive), and the properties of the materials bonded to the structural adhesive. τ1, τ2, and τ3 are fixed values ​​or can be considered fixed values ​​given that the structural adhesive, insulating film, and insulating coating are fixed. τ1, τ2, and τ3 can be derived by analogy to the methods described above for σ1, σ2, and v3, and will not be repeated here.

[0082] When determining the above A1, A2, and A3 related to the geometry, the above relationship (1) or (2) and relationship (3) can be combined to make the determination, so that the battery cell can simultaneously meet the tensile strength requirements and shear strength requirements, and the geometry determined in this way is more in line with the actual application scenario.

[0083] In other embodiments, considering the insulation strength requirements of the battery cell, the areas of the first insulating area 111, the hollow area 112, and the second insulating area 113 of the fixing surface 110 are further configured such that, when the fixing surface is bonded to the carrier plate with structural adhesive, the equivalent resistance of the first insulating area 111, the hollow area 112, and the second insulating area 113 is at least 10 MΩ, that is, the path resistance from the carrier plate to the fixing surface 110 of the battery cell housing is greater than or equal to 10 MΩ.

[0084] With the fixed surface bonded to the carrier plate, a portion of the structural adhesive is located between the insulating film of the first insulating region 111 and the carrier plate. The path resistance from the carrier plate to the first insulating region 111 is related to the volume resistivity of the structural adhesive, the thickness of the structural adhesive, the volume resistivity of the insulating film, the thickness of the insulating film, and the area of ​​the first insulating region 111. A portion of the structural adhesive is located between the hollow region 112 and the carrier plate (or optionally, a limiting strip). The path resistance from the carrier plate (or optionally, a limiting strip) to the hollow region 112 is related to the volume resistivity of the structural adhesive, the thickness of the structural adhesive, and the area of ​​the hollow region 112. Area A2; A portion of the structural adhesive is located between the insulating coating of the second insulating region 113 and the carrier plate. The path resistance from the carrier plate to the second insulating region 113 is related to the volume resistivity of the structural adhesive, the thickness of the structural adhesive, the volume resistivity of the insulating coating, the thickness of the insulating coating, and the area A3 of the second insulating region 113; A portion of the structural adhesive is located on the overflow fixing surface 110 and is squeezed between adjacent battery cells. The corresponding resistance is related to the volume resistivity of the structural adhesive, the area covered by the overflow insulating adhesive, and the thickness of the insulating adhesive; The above equivalent resistance is calculated as the parallel resistance of the four resistances described herein. Wherein, the above volume resistivity is a fixed value or can be considered a fixed value when the structural adhesive, insulating film, or insulating coating is fixed, and its corresponding value can be obtained by testing.

[0085] In some embodiments, given that the thickness of the structural adhesive, the thickness of the insulating film, and the thickness of the insulating coating are fixed, the areas of the first insulating region 111, the hollow region 112, and the second insulating region 113 of the fixing surface can be determined according to the above relationships (1) and (3) and in conjunction with the equivalent resistance. The areas of the three regions determined in this way can simultaneously meet the requirements of insulation strength and fixing strength.

[0086] In other embodiments, the areas of the first insulating region 111, the hollow region 112 and the second insulating region 113 of the fixed surface 110 are determined according to the above relationships (1) and (3), and the thickness of the insulating film, the thickness of the insulating coating and the thickness of the structural adhesive are determined according to the equivalent resistance. This also belongs to the modified design of the structure of the battery pack, especially the battery cells contained therein.

[0087] In other embodiments, the areas of the first insulating region 111, the hollow region 112, and the second insulating region 113 are determined according to relation (1) or (3), and the thickness of the insulating film, the thickness of the insulating coating, and the thickness of the structural adhesive are determined according to the equivalent resistance. This also belongs to the modified design of the structure of the battery pack, especially the battery cells contained therein.

[0088] Finally, according to the second aspect of this application, an electrical device is also proposed, which includes the battery pack described above. This electrical device can be, but is not limited to, the new energy vehicle mentioned above. In particular, the advantages and features described regarding the battery pack according to this application become apparent with respect to the electrical device according to this application, and reference can be made accordingly to the description made regarding the battery pack according to this application.

[0089] It should be understood that all the above preferred embodiments are exemplary and not restrictive. Various modifications, variations, or combinations made by those skilled in the art to the specific embodiments described above under the concept of this utility model should be within the legal protection scope of this utility model.

Claims

1. A battery pack comprising a housing and a plurality of battery cells arranged therein in a stacking direction, each battery cell having a housing including a fixing surface for fixing to a support plate of the housing by structural adhesive, wherein, The fixing surface includes a hollow area that exposes the outer surface of the housing, a first insulating area covered with an insulating film, and a second insulating area covered with an insulating coating. The feature is that, for the geometry of the hollow area, the first insulating area, and the second insulating area, the corresponding areas they occupy satisfy the following relationship: Wherein, σ1 is the tensile strength of the first insulating zone bonded to the bearing plate; A1 is the area of ​​the first insulating region; σ2 is the tensile strength of the hollowed-out area bonded to the support plate; A2 is the area of ​​the hollowed-out area; σ3 is the tensile strength of the second insulation zone bonded to the bearing plate; A3 represents the area of ​​the second insulating region.

2. The battery pack according to claim 1, characterized in that, The areas of the hollowed-out area, the first insulating area, and the second insulating area also satisfy the following relationship: Where τ is the equivalent shear strength; τ1 is the shear strength of the first insulating zone bonded to the bearing plate; A1 is the area of ​​the first insulating region; τ2 is the shear strength of the hollowed-out area bonded to the support plate; A2 is the area of ​​the hollowed-out area; τ3 is the shear strength of the second insulating zone bonded to the bearing plate; A3 represents the area of ​​the second insulating region.

3. The battery pack according to claim 1 or 2, characterized in that, The areas of the hollow area, the first insulating area, and the second insulating area are configured such that, when the fixed surface is bonded to the carrier plate with structural adhesive, the equivalent resistance of the hollow area, the first insulating area, and the second insulating area is at least 10MΩ.

4. The battery pack according to claim 3, characterized in that, The thickness of the insulating film is 20μm-200μm; And / or, the thickness of the insulating coating is 20μm-250μm; And / or, the thickness of the structural adhesive is 0.1mm-2mm.

5. The battery pack according to claim 1, characterized in that, A limiting strip is provided on the area of ​​the support plate corresponding to the hollow area, wherein the hollow area is fixed to the limiting strip by structural adhesive.

6. The battery pack according to claim 5, characterized in that, The limiting strip extends along the stacking direction and is simultaneously fixed to the hollowed-out areas of multiple battery cells.

7. The battery pack according to claim 1, characterized in that, The first insulating region extends circumferentially into the edge region of the fixed surface and surrounds the hollowed-out region and the second insulating region on the outside.

8. The battery pack according to claim 7, characterized in that, The two opposite boundaries of the hollowed-out area in the stacking direction are respectively defined by the boundary of the first insulating area.

9. The battery pack according to claim 7, characterized in that, The housing of the battery cell also includes a side surface that is perpendicular to and connected to the fixing surface, and an insulating film is provided on the side surface, which is integral with the insulating film on the fixing surface.

10. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 9.

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