Battery modules and electrical equipment

Abstract

This application discloses a battery module and an electrical device. The battery module includes a first housing, a second housing, a first adhesive, and a battery cell. The first housing includes a first recess, and the second housing and the first housing enclose a receiving space. The battery cell is installed in the receiving space. The second housing includes a first protrusion that extends along a first direction and inserts into the first recess, and is bonded to the first recess by the first adhesive. The first protrusion includes a first surface, a second surface, and a third surface. The first surface faces the battery cell, the second surface is aligned with the first surface along a second direction perpendicular to the first direction, and the orientation of the second surface is opposite to that of the first surface. The third surface is in contact with both the first and second surfaces, and at least a portion of the third surface is inclined relative to the second direction. This application creates a first space within the first recess and uses the third surface to press the first adhesive into the first space, thereby increasing the amount of adhesive stored in the first recess and reducing the initial amount of adhesive required.

Description

Technical Field

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

[0002] Currently, devices carrying battery modules for power supply are very common. A battery module consists of battery cells for power supply and a casing that surrounds the cells. To facilitate manufacturing and cell installation, the casing is typically composed of multiple parts, and adhesive bonding between these parts is a common method.

[0003] When two housings are joined, one housing has a groove, and the other housing has a protrusion that extends into the groove. This improves the bonding effect between the two housings, and the adhesive is usually placed inside the groove where the protrusion extends. To ensure sufficient adhesive remains inside the groove and increase the bonding strength between the two housings, a large amount of adhesive needs to be poured into the groove beforehand. This can cause a large amount of adhesive to overflow from the groove after the protrusion extends into it. Furthermore, excessive adhesive increases the overall weight of the battery module, and the adhesive overflowing onto the outside of the housing can affect other battery modules and is difficult to clean. Summary of the Invention

[0004] In view of this, it is necessary to provide a battery module that can reduce the amount of potting compound.

[0005] Some embodiments of this application provide a battery module, which includes a first housing, a second housing, a first adhesive member, and a battery cell. The first housing includes a first recess, and the second housing and the first housing enclose a receiving space, in which the battery cell is installed. The second housing includes a first protrusion that extends along a first direction and inserts into the first recess. The first protrusion is bonded to the first recess by the first adhesive member. The first protrusion includes a first surface, a second surface, and a third surface. The first surface faces the battery cell, the second surface is arranged along a second direction perpendicular to the first direction, and the orientation of the second surface along the second direction is opposite to that of the first surface. The third surface is in contact with both the first and second surfaces, and at least a portion of the third surface is inclined relative to the second direction.

[0006] By tilting the third surface at least partially, a first space is left in the first recess after the first protrusion is installed in place. The first adhesive in the first recess is pressed into the first space by the tilted part of the third surface, which can increase the amount of adhesive in the first recess, reduce the initial amount of adhesive, and further reduce the overflow of the first adhesive.

[0007] In some embodiments, the first recess includes a fourth surface and a fifth surface, with the fourth surface disposed opposite to the first surface and the fifth surface disposed opposite to the second surface along the second direction.

[0008] In some embodiments, the first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along a first direction. The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface to the second surface in the first direction.

[0009] In some embodiments, along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

[0010] The aforementioned arrangement, where the distance between the first inclined surface and the sixth surface gradually increases in the first direction, allows the first inclined surface to press the first adhesive component away from the receiving space, reducing the risk of the first adhesive component flowing into the receiving space. This, in turn, reduces the risk of the first adhesive component squeezing the battery after flowing into the receiving space, thereby improving the reliability of the battery.

[0011] In some embodiments, the third surface further includes a second recess, which is in contact with both the first surface and the first inclined surface.

[0012] In some embodiments, the portion of the second recess that contacts the first surface is provided with a first curved surface.

[0013] When the first curved surface is configured as an outwardly convex arc-shaped surface, the first convex portion can form an "S"-shaped streamlined portion, reducing the resistance of the first convex portion during insertion into the first recess containing the first adhesive. When the first curved surface is configured as an inwardly concave arc-shaped surface, the second space between the first convex portion and the first recess can be further expanded.

[0014] In some embodiments, the first surface includes a first region and a second region arranged along a first direction. When viewed along a second direction, the projection of the first region overlaps with the projection of the fourth surface, while the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is a third distance, and the distance between the first surface and the sixth surface in the first direction is a fourth distance. The third distance is greater than the fourth distance.

[0015] In some embodiments, the distance between the first surface and the fourth surface in the second direction is the first distance, and the distance between the second surface and the fifth surface in the second direction is the second distance, wherein the first distance is less than the second distance.

[0016] When the first distance is less than the second distance, the space between the first and fourth surfaces that can accommodate the first adhesive is less than the space between the second and fifth surfaces that can accommodate the first adhesive. This allows the first protrusion to guide the first adhesive to move toward the position between the second and fifth surfaces when it is squeezed, thereby reducing the risk of the first adhesive flowing into the accommodating space.

[0017] In some embodiments, the first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along a first direction. The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface to the second surface in the first direction.

[0018] In some embodiments, along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

[0019] In some embodiments, the first surface includes a first region and a second region arranged along a first direction. When viewed along a second direction, the projection of the first region overlaps with the projection of the fourth surface, while the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is a third distance, and the distance between the first surface and the sixth surface in the first direction is a fourth distance. The third distance is greater than the fourth distance.

[0020] In some embodiments, the first surface and the fourth surface are at least partially in contact.

[0021] The fact that the first surface and the fourth surface are at least partially in contact allows the first protrusion to easily enter the first recess along the extension direction of the fourth surface. It also allows the operator to more intuitively feel whether the first protrusion and the first recess are properly aligned, improving the efficiency and accuracy of shell assembly. When the first surface and the fourth surface are at least partially in contact, it also prevents the first adhesive from flowing into the space between the first and fourth surfaces, thereby reducing the risk of the first adhesive flowing into the receiving space.

[0022] In some embodiments, the first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along a first direction. The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface to the second surface in the first direction.

[0023] In some embodiments, the third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually increases in the first direction along the direction from the first surface to the second surface.

[0024] In some embodiments, the first surface includes a first region and a second region arranged along a first direction. When viewed along a second direction, the projection of the first region overlaps with the projection of the fourth surface, while the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is a third distance, and the distance between the first surface and the sixth surface in the first direction is a fourth distance. The third distance is greater than the fourth distance.

[0025] In some embodiments, the second surface is separate from the fifth surface.

[0026] The fact that the second and fifth surfaces are separated allows the first adhesive component to be guided into the position between the second and fifth surfaces, thereby reducing the risk of the first adhesive component flowing into the receiving space.

[0027] In some embodiments, the first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along a first direction. The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface to the second surface in the first direction.

[0028] In some embodiments, along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

[0029] In some embodiments, the first surface includes a first region and a second region arranged along a first direction. When viewed along a second direction, the projection of the first region overlaps with the projection of the fourth surface, while the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is a third distance, and the distance between the first surface and the sixth surface in the first direction is a fourth distance. The third distance is greater than the fourth distance.

[0030] In some embodiments, the first surface includes a first region and a second region distributed along a first direction. When viewed along a second direction, the projection of the first region overlaps with the projection of the fourth surface, while the projection of the second region is separate from the projection of the fourth surface.

[0031] The projections of the second region and the fourth surface are separated, so that the second region is located outside the first recess, and a step is formed between the second region and the first shell with the first recess. This step can serve as a buffer area for the first adhesive to flow into the receiving space when it flows into the second region through the first region and the fourth surface, thereby reducing the risk of the first adhesive squeezing the cell unit.

[0032] In some embodiments, the first adhesive extends from the first region to the second region.

[0033] The aforementioned first adhesive extending from the first region to the second region ensures sufficient adhesion between the first region and the fourth surface, thereby improving the bonding strength between the first housing and the second housing. Furthermore, the first adhesive flowing into the second region can compensate for the step formed between the second region and the first housing with the first recess, reducing the risk of damage to the battery housing when the step contacts the battery cell.

[0034] In some embodiments, the first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along a first direction. The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface to the second surface in the first direction.

[0035] In some embodiments, along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

[0036] In some embodiments, the third surface further includes a second recess, which is in contact with both the first surface and the first inclined surface.

[0037] In some embodiments, the portion of the second recess that contacts the first surface is provided with a first curved surface.

[0038] In some embodiments, the length of the first region along the first direction is the third distance, the distance between the first surface and the sixth surface in the first direction is the fourth distance, and the third distance is greater than the fourth distance.

[0039] The fact that the third distance is greater than the fourth distance can increase the contact area between the first surface and the fourth surface through the first adhesive, thereby increasing the bonding strength between the first shell and the second shell.

[0040] In some embodiments, the first housing further includes a third side surface that is in contact with a fourth surface. When viewed along a second direction, the third side surface is exposed in the first recess. The first housing also includes a fourth side surface that is in contact with a fifth surface. When viewed along a second direction, the fourth side surface is exposed in the first recess.

[0041] In some embodiments, the second housing further includes a first side surface, which is in contact with the first surface and, when viewed along the second direction, is separate from the first recess.

[0042] A groove is formed between the first side, the first surface, and the first housing forming the first recess, which can further facilitate the containment of the first adhesive and reduce the risk of the first adhesive squeezing the cell unit after entering the containment space.

[0043] In some embodiments, the portion of the first side facing the first housing is provided with a second curved surface.

[0044] In extreme cases where a battery module collides, the cell unit may move within the housing space. When the second curved surface is configured to convex outward to form an arc-shaped surface, the risk of damage during a collision between the cell housing and the second housing can be reduced. When the second curved surface is configured to concave inward to form an arc-shaped surface, the amount of space between the first side surface and the first housing portion forming the first recess can be increased to accommodate the first adhesive member.

[0045] In some embodiments, the second housing further includes a second side surface, which is in contact with the second surface and, when viewed along the second direction, is separate from the first recess.

[0046] A groove is formed between the second side, the second surface, and the first housing forming the first recess, which can further facilitate the accommodation of the first adhesive and reduce the risk of the first adhesive overflowing out of the accommodation space.

[0047] In some embodiments, the portion of the second side facing the first housing is provided with a third curved surface.

[0048] The aforementioned third curved surface can expand the space between the second side and the first housing forming the first recess, thereby increasing the amount of the first adhesive component that can be accommodated and further reducing the risk of the first adhesive component overflowing.

[0049] The distance between the first side and the third side in the first direction is the fifth distance, and the distance between the second side and the fourth side in the first direction is the sixth distance. The fifth distance is greater than the sixth distance.

[0050] The fact that the fifth distance is greater than the sixth distance can further increase the amount of the first adhesive material overflowing from the first recess in the space between the first side and the third side, thereby reducing the risk of the first adhesive material coming into contact with the battery cell.

[0051] In some embodiments, the first housing further includes a fourth curved surface located between the third side surface and the fourth surface, and connecting the third side surface and the fourth surface.

[0052] The aforementioned fourth curved surface can increase the amount of the first adhesive component that can be accommodated between the first side and the third side, further reducing the risk of the first adhesive component overflowing.

[0053] In some embodiments, the first housing further includes a fifth curved surface located between the fourth side surface and the fifth surface, and connecting the fourth side surface and the fifth surface.

[0054] When the aforementioned fifth curved surface is configured as an outwardly convex arc-shaped surface, it can guide the first adhesive component to flow away from the receiving space. When the aforementioned fifth curved surface is configured as an inwardly concave arc-shaped surface, it can increase the amount of the first adhesive component retained in the first recess, thereby increasing the bonding strength between the first housing and the second housing.

[0055] In some embodiments, the first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along a first direction. The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually decreases along the direction from the first surface to the second surface in the first direction.

[0056] The distance between the first inclined surface and the sixth surface gradually decreases in the first direction, allowing the first inclined surface to press the first adhesive component closer to the receiving space. This reduces the risk of the first adhesive component overflowing from the first and second housings, and further reduces the risk of the overflowing component bringing out a portion of the first adhesive component from the first recess. Furthermore, the first inclined surface preventing the first adhesive component from overflowing from the first and second housings also saves on subsequent adhesive application steps, improving the assembly efficiency of the battery module.

[0057] In some embodiments, a first adhesive is provided between the second surface and the fifth surface, and when viewed along the second direction, the first adhesive between the second surface and the fifth surface has a first gap.

[0058] The aforementioned first gap can reduce the overall weight of the battery module, thereby increasing the energy density of the battery module.

[0059] In some embodiments, a first adhesive is provided between the first surface and the fourth surface, and when viewed along the second direction, the first adhesive between the first surface and the fourth surface has a second gap.

[0060] The aforementioned second gap can reduce the overall weight of the battery module, thereby increasing the energy density of the battery module.

[0061] In some embodiments, the third surface includes a second recess that is in contact with the first surface.

[0062] After the first protrusion is inserted into the first recess, a second space for storing the first adhesive is formed between the second recess and the first recess. The concave shape of the second recess can retain the first adhesive in the second space, which can increase the amount of adhesive left between the first recess and the first protrusion. This can reduce the amount of the first adhesive poured before the first protrusion is inserted into the first recess, and further reduce the risk of the first adhesive overflowing from the first recess or reduce the amount of the first adhesive overflowing.

[0063] In some embodiments, the portion of the second recess that contacts the first surface is provided with a first curved surface.

[0064] In some embodiments, the first adhesive is made of at least one of silicone, polyurethane, acrylate, and epoxy.

[0065] Additionally, it is necessary to provide an electrical device that uses the aforementioned battery module.

[0066] Some embodiments of this application provide an electrical device, which includes a device body and a battery module as described in any of the above embodiments, the battery module being installed on the device body.

[0067] The battery module of the aforementioned electrical equipment uses less potting compound, which reduces the production cost of the battery module, reduces the risk of overflow of the first adhesive component, and improves the reliability of the battery module. This, in turn, reduces the production cost of the electrical equipment and improves its reliability.

[0068] The battery module of this application includes a first housing, a second housing, a first adhesive, and a cell unit installed in a receiving space. A first protrusion of the second housing extends along a first direction and inserts into a first recess of the first housing. The first protrusion is bonded to the first recess by the first adhesive. At least a portion of the third surface of the first protrusion is inclined relative to the second direction. By setting at least a portion of the third surface to be inclined, a first space is left in the first recess after the first protrusion is installed in place, and the first adhesive in the first recess is pressed into the first space by the inclined portion of the third surface, which can increase the amount of adhesive stored in the first recess, and further reduce the initial amount of adhesive and the overflow of the first adhesive. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of the structure of a battery module provided in one embodiment of this application.

[0070] Figure 2 for Figure 1 Cross-sectional view of the battery module.

[0071] Figure 3 This is a cross-sectional view of a battery module provided in an embodiment of this application.

[0072] Figure 4 This is a cross-sectional view of a battery module provided in an embodiment of this application.

[0073] Figure 5 This is a cross-sectional view of a battery module provided in one embodiment of this application from another perspective.

[0074] Figure 6 This is a cross-sectional view of a battery module provided in one embodiment of this application from another perspective.

[0075] Figure 7 An exploded view of an electrode assembly with a conductive plate and a battery cell housing provided in an embodiment of this application.

[0076] Figure 8 This is a schematic diagram of the structure of a battery cell unit provided in an embodiment of this application.

[0077] Figure 9 This is an exploded view of a battery module provided in one embodiment of this application.

[0078] Figure 10 This is a schematic diagram of the first housing and the second housing of a battery module provided in an embodiment of this application.

[0079] Figure 11 A side view of the first housing of a battery module that hides the second housing according to an embodiment of this application.

[0080] Figure 12A side view of a second housing of a battery module that hides the first housing, according to an embodiment of this application.

[0081] Figure 13 for Figure 3 A magnified view of part A in the middle.

[0082] Figure 14 This is a partial schematic diagram showing the engagement of a first recess and a first protrusion according to an embodiment of this application.

[0083] Figure 15 This is a partial schematic diagram showing the engagement of a first recess and a first convex portion according to an embodiment of this application.

[0084] Figure 16 This is a schematic diagram of the structure of the first protrusion provided in an embodiment of this application.

[0085] Figure 17 This is a partial schematic diagram showing the engagement of a first recess and a first convex portion according to an embodiment of this application.

[0086] Figure 18 This is a partial schematic diagram showing the engagement of a first recess and a first convex portion according to an embodiment of this application.

[0087] Figure 19 This is a partial schematic diagram showing the engagement of a first recess and a first convex portion according to an embodiment of this application.

[0088] Figure 20 This is a partial schematic diagram showing the engagement of a first recess and a first protrusion according to an embodiment of this application.

[0089] Figure 21 This is a partial schematic diagram showing the engagement of a first recess and a first convex portion according to an embodiment of this application.

[0090] Figure 22 This is a partial schematic diagram showing the engagement of a first recess and a first protrusion according to an embodiment of this application.

[0091] Figure 23 This is a cross-sectional view of a battery module provided in an embodiment of this application.

[0092] Figure 24 This is a partial schematic diagram showing the engagement of a first recess and a first protrusion according to an embodiment of this application.

[0093] Figure 25 This is a partial schematic diagram showing the engagement of a first recess and a first protrusion according to an embodiment of this application.

[0094] Figure 26 This is a schematic diagram of an electrical device provided in an embodiment of this application.

[0095] Explanation of main component symbols

[0096] Battery Module 100

[0097] Cell Unit 10

[0098] Electrode assembly 11

[0099] Cell casing 12

[0100] First side section 121

[0101] Second side 122

[0102] Third side 123

[0103] Fourth side 124

[0104] Fifth side 125

[0105] Sixth side 126

[0106] Conductive plate 13

[0107] Terminal 103

[0108] First circuit board 104

[0109] Second circuit board 105

[0110] First shell 20

[0111] First Wall 20a

[0112] Second wall 20b

[0113] Third wall 20c

[0114] Fourth wall 20d

[0115] Fifth Wall 20e

[0116] First containment tank 230a

[0117] first recess 21

[0118] Page 4, page 211

[0119] Third recess 2111

[0120] Page 5, 212

[0121] Page 6, page 213

[0122] Third side 23

[0123] Fourth surface 231

[0124] Fourth side 24

[0125] Fifth surface 241

[0126] Second shell 30

[0127] Sixth Wall 30a

[0128] Seventh Wall 30b

[0129] Eighth wall 30c

[0130] Ninth Wall 30d

[0131] The Tenth Wall 30e

[0132] Second containment tank 230b

[0133] first convex portion 31

[0134] Page 311

[0135] First area 3111

[0136] Second area 3112

[0137] Second convex portion 3113

[0138] Second page 312

[0139] Page 313

[0140] First inclined plane 3131

[0141] Second recess 3132

[0142] First surface 3133

[0143] Second slope 3134

[0144] First side view 331

[0145] Second surface 3311

[0146] Second side 332

[0147] Third surface 3321

[0148] Capacity 230

[0149] First adhesive component 40

[0150] First extension section 40a

[0151] Second extension section 40b

[0152] Third extension section 40c

[0153] Fourth Extension Section 40d

[0154] First gap 401

[0155] Second gap 402

[0156] Step 60

[0157] First Space 10a

[0158] Second Space 10b

[0159] First distance D1

[0160] Second distance D2

[0161] Third distance D3

[0162] Fourth distance D4

[0163] Fifth distance D5

[0164] Sixth distance D6

[0165] First direction X

[0166] Second direction Y

[0167] Third direction Z

[0168] Equipment body 200

[0169] 1000 electrical appliances Detailed Implementation

[0170] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0171] Therefore, the following detailed description of embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the present application.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] In the description of the embodiments of this application, the term "multiple" refers to two or more, including two.

[0176] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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.

[0177] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "set," "install," "connect," "join," and "fix" 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, an electrical connection, or a signal 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0178] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0179] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0180] This application discloses a battery module, which includes a first housing, a second housing, a first adhesive member, and a battery cell unit. The first housing includes a first recess, and the second housing and the first housing enclose a receiving space, in which the battery cell unit is installed. The second housing includes a first protrusion, which extends along a first direction and inserts into the first recess. The first protrusion is bonded to the first recess by the first adhesive member. The first protrusion includes a first surface, a second surface, and a third surface. The first surface faces the battery cell unit, the second surface is arranged along a second direction perpendicular to the first direction, and the orientation of the second surface along the second direction is opposite to that of the first surface. The third surface is in contact with both the first and second surfaces, and at least a portion of the third surface is inclined relative to the second direction.

[0181] By tilting the third surface at least partially, a first space is left in the first recess after the first protrusion is installed in place. The first adhesive in the first recess is pressed into the first space by the tilted part of the third surface, which can increase the amount of adhesive in the first recess and further reduce the initial amount of adhesive and the overflow of the first adhesive.

[0182] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0183] Please see Figures 1 to 4 This application provides a battery module 100, which includes a cell unit 10, a first housing 20, a second housing 30, and a first adhesive member 40.

[0184] The first housing 20 includes a first wall 20a, a second wall 20b, a third wall 20c, and a fourth wall 20d connected in a ring-like sequence. The first housing 20 also includes a fifth wall 20e connected to all of the first, second, third, and fourth walls 20a, 20b, 20c, and 20d, forming a first receiving groove 230a. The second housing 30 includes a sixth wall 30a, a seventh wall 30b, an eighth wall 30c, and a ninth wall 30d connected in a ring-like sequence. The second housing 30 also includes a tenth wall 30e connected to all of the sixth, seventh, eighth, and ninth walls 30c, forming a second receiving groove 230b.

[0185] The first housing 20 and the second housing 30 are arranged along the first direction X, connecting the first receiving groove 230a and the second receiving groove 230b to form a receiving space 230, in which the battery cell unit 10 is installed. The first wall 20a and the third wall 20c are arranged at intervals along the second direction Y, and the sixth wall 30a and the eighth wall 30c are arranged at intervals along the second direction Y. The second wall 20b and the fourth wall 20d are arranged at intervals along the third direction Z, and the seventh wall 30b and the ninth wall 30d are arranged at intervals along the third direction Z. The first direction X is perpendicular to both the second direction Y and the third direction Z. The first direction X is the direction of the line connecting the fifth wall 20e and the tenth wall 30e. The second direction Y is the direction of the line connecting the first wall 20a and the third wall 20c, or the direction of the line connecting the sixth wall 30a and the eighth wall 30c. The third direction Z is the direction of the line connecting the second wall 20b and the fourth wall 20d, or the direction of the line connecting the seventh wall 30b and the ninth wall 30d.

[0186] Please see Figure 7 The battery cell unit 10 includes an electrode assembly 11, a battery cell housing 12, and a conductive plate 13. The electrode assembly 11 is housed within the battery cell housing 12, and the conductive plate 13 is connected to the electrode assembly 11 and extends from at least one end of the electrode assembly 11 along a first direction X.

[0187] In other embodiments, the conductive plate 13 is connected to the electrode assembly 11 and extends from at least one end of the electrode assembly 11 along a second direction Y, which is perpendicular to the first direction X.

[0188] The electrode assembly 11 includes an electrode sheet (not shown) and a separator (not shown). The electrode sheet and the separator can be stacked or stacked and then wound together. The electrode sheet is divided into a positive electrode sheet and a negative electrode sheet, and the separator is disposed between the positive electrode sheet and the negative electrode sheet. The electrode sheet and the separator are disposed inside the cell housing 12, and electrolyte can also be injected into the cell housing 12.

[0189] In some embodiments, the electrode is formed by bonding an active material layer onto a metal layer. Electrodes of different polarities use different metal materials. The positive electrode can be formed by bonding a positive electrode paste onto at least one metal layer such as aluminum, platinum, nickel, tantalum, and titanium, with the positive electrode paste bonded to the metal layer forming a positive active material layer. The negative electrode can be formed by bonding a negative electrode paste onto at least one metal layer such as copper, platinum, nickel, tantalum, and titanium, with the negative electrode paste bonded to the metal layer forming a negative active material layer. For example, the positive electrode includes an aluminum layer, and the negative electrode includes a copper layer.

[0190] In some embodiments, please refer to Figures 3 to 6The battery cell unit 10 within the accommodating space 230 consists of two or more cells, which can be connected in series or in parallel via conductive plates 13. Multiple battery cell units 10 are stacked along the third direction Z.

[0191] In some embodiments, please refer to Figure 3 and Figure 5 Along the first direction X, the conductive plates 13 of the plurality of battery cells 10 extend from one end of the electrode assembly 11 located in the second receiving groove 230b, and the conductive plates 13 of the plurality of battery cells 10 are located in the second receiving groove 230b.

[0192] In some embodiments, please refer to Figure 4 and Figure 6 The conductive plates 13 of the multiple battery cells 10 extend from one end of the electrode assembly 11 located in the first receiving groove 230a, and the conductive plates 13 of the multiple battery cells 10 are located in the first receiving groove 230a.

[0193] Please see Figure 7 and Figure 8 The battery cell housing 12 can be composed of multiple parts, which, when combined, form a space capable of accommodating the electrode assembly 11. After the multiple parts of the battery cell housing 12 are combined, sealing edges are formed at the joints. The battery cell housing 12, after being combined, has a first side portion 121 and a second side portion 122 disposed opposite each other along a first direction X; a third side portion 123 and a fourth side portion 124 disposed opposite each other along a second direction Y; and a fifth side portion 125 and a sixth side portion 126 disposed opposite each other along a third direction Z. Sealing edges can be formed on the first side portion 121, the second side portion 122, the third side portion 123, the fourth side portion 124, the fifth side portion 125, and the sixth side portion 126.

[0194] The cell housing 12 can be a flexible housing such as an aluminum-plastic film, or it can be a rigid housing formed by combining plastic or metal with insulating components. A portion of the conductive plate 13 is located inside the housing and connected to the electrode plate, while another portion extends out of the housing to guide the polarity of the electrode plate. The conductive plate 13 can extend from either the first side 121 or the second side 122; no specific limitation is made here. The conductive plate 13 has a positive electrode and a negative electrode; the positive conductive plate 13 is connected to the positive electrode plate, and the negative conductive plate 13 is connected to the negative electrode plate.

[0195] In some embodiments, conductive plates 13 with different polarities are made of different materials. For example, a conductive plate 13 with a positive polarity includes an aluminum metal layer, and a conductive plate 13 with a negative polarity includes a copper metal layer or a copper-plated nickel metal layer.

[0196] In some other embodiments, the cell unit 10 within the housing space 230 is one.

[0197] In some embodiments, please refer to Figure 5 The battery module 100 also includes a first circuit board 104, which is connected to the conductive plate 13. The first circuit board 104 can serve as an adapter, allowing the conductive plates 13 of different battery cells 10 to contact each other on the first circuit board 104 to achieve series or parallel connection.

[0198] In some embodiments, please refer to Figure 5 The battery module 100 also includes a second circuit board 105, which can serve as a BMS (Battery Management System) board. The second circuit board 105 can be electrically connected to the first circuit board 104, thereby connecting to the conductive plates 13 of the multiple battery cell units 10. Alternatively, the second circuit board 105 can be directly connected to the multiple conductive plates 13. The second circuit board 105 can collect parameters such as voltage, temperature, and current of the battery cell units 10 to monitor their operating status, thus improving the reliability of the battery cell units 10.

[0199] In some embodiments, please refer to Figure 5 The battery cell module 100 also includes a terminal 103 electrically connected to the second circuit board 105. A portion of the terminal 103 is located inside the receiving space 230, and a portion of the terminal 103 is located outside the receiving space 230, thereby facilitating the electrical connection of the battery cell unit 10 to the external components of the receiving space 230.

[0200] In some embodiments, please refer to Figure 3 and Figure 5 The first circuit board 104 and the second circuit board 105 are both located within the second receiving groove 230b, which helps to increase the distance between the first circuit board 104 and the second circuit board 105 and the first protrusion 31 and the first recess 21, thereby reducing the risk of contact corrosion between the first adhesive 40 and the first circuit board 104 and the second circuit board 105. In embodiments where the conductive plates 13 of multiple battery cells 10 are located within the second receiving groove 230b, it also facilitates the connection between the conductive plates 13 and the first circuit board 104.

[0201] In some embodiments, please refer to Figure 4 and Figure 6The first circuit board 104 and the second circuit board 105 are both located within the first receiving groove 230a, which helps to increase the distance between the first circuit board 104 and the second circuit board 105 and the first protrusion 31 and the first recess 21, thereby reducing the risk of contact corrosion between the first adhesive 40 and the first circuit board 104 and the second circuit board 105. In embodiments where the conductive plates 13 of multiple battery cells 10 are located within the first receiving groove 230a, it also facilitates the connection between the conductive plates 13 and the first circuit board 104.

[0202] In some embodiments, the second side 122, the third side 123, and the fourth side 124 of the cell housing 12 are all in direct contact with the first housing 20 and / or the second housing 30.

[0203] Please see Figure 9 and Figure 10 The first housing 20 and the second housing 30 are arranged along the first direction X, so that the first receiving groove 230a and the second receiving groove 230b are connected to form a receiving space 230, and the battery cell unit 10 is installed in the receiving space 230.

[0204] In some embodiments, please refer to Figures 9 to 12 The first housing 20 includes a first recess 21, which is formed around the first wall 20a, second wall 20b, third wall 20c, and fourth wall 20d on the side facing the second housing 30. The second housing 30 includes a first protrusion 31, which is formed around the sixth wall 30a, seventh wall 30b, eighth wall 30c, and ninth wall 30d on the side facing the first housing 20. The first protrusion 31 extends along a first direction X and is inserted into the first recess 21. The first protrusion 31 is bonded to the first recess 21 by a first adhesive member 40.

[0205] Please see Figure 3 and Figure 13 The first protrusion 31 includes a first surface 311, a second surface 312, and a third surface 313. Along the second direction Y, the first surface 311 faces the battery cell unit 10. The second surface 312 is arranged along the second direction Y with the first surface 311, and the orientation of the second surface 312 is opposite to that of the first surface 311. The first surface 311 is closer to the receiving space 230 than the second surface 312. Along the second direction Y, the third surface 313 is in contact with both the first surface 311 and the second surface 312, and at least a portion of the third surface 313 is inclined relative to the second direction Y.

[0206] In some embodiments, please refer to Figure 13 and Figure 14The first recess 21 includes a fourth surface 211, a fifth surface 212, and a sixth surface 213. Along the second direction Y, the fourth surface 211 is opposite to the first surface 311, and the fifth surface 212 is opposite to the second surface 312. The sixth surface 213 is in contact with both the fourth surface 211 and the fifth surface 212. Along the first direction X, the sixth surface 213 is opposite to the third surface 313. The third surface 313 includes a first inclined surface 3131, which is the portion of the third surface 313 that is inclined relative to the second direction Y. Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 gradually changes in the first direction X. This gradual change can be understood as gradually increasing or gradually decreasing; for example, please refer to... Figure 13 Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases. This allows the first inclined surface 3131 to press the first adhesive member 40 away from the receiving space 230, reducing the risk of the first adhesive member 40 flowing into the receiving space 230. This, in turn, reduces the risk of the first adhesive member 40 squeezing the originally fixed battery after flowing into the receiving space 230, thereby improving battery reliability. In some embodiments, please refer to... Figure 14 The third wall 20c also includes a third side surface 23, which extends along the second direction Y and is connected to the fourth surface 211. The first adhesive member 40 includes a first extension 40a that partially overflows the first recess 21. The first extension 40a is located on the side of the first surface 311 opposite to the second surface 312, and the first extension 40a is also bonded to the third side surface 23. The first extension 40a helps to improve the stability of the connection between the first housing 20 and the second housing 30.

[0207] For example, please refer to Figure 15 Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 gradually decreases in the first direction X. This allows the first inclined surface 3131 to press the first adhesive member 40 towards the receiving space 230, reducing the risk of the first adhesive member 40 overflowing from the first housing 20 and the second housing 30, and further reducing the risk of the first adhesive member 40 that overflows from the first housing 20 and the second housing 30 being pulled out of the first recess 21. Furthermore, the first inclined surface 3131, by preventing the first adhesive member 40 from overflowing from the first housing 20 and the second housing 30, also saves the subsequent adhesive application process, improving the assembly efficiency of the battery module 100. In some embodiments, please refer to... Figure 15The eighth wall 30c includes a first side surface 331 extending along the second direction Y. The first side surface 331 is located on the side of the first surface 311 opposite to the second surface 312 and is in contact with the first surface 311. The first adhesive member 40 includes a second extension 40b partially overflowing the first recess 21. The second extension 40b is located on the side of the first surface 311 opposite to the second surface 312 and is also bonded to the first side surface 331. The second extension 40b helps to improve the stability of the connection between the first housing 20 and the second housing 30.

[0208] Please see Figure 3 and Figure 13 A first space 10a for storing the first adhesive 40 is formed between the first inclined surface 3131 of the third surface 313 and the first recess 21. The first inclined surface 3131 presses the first adhesive 40 into the first space 10a, which can increase the amount of adhesive remaining between the first recess 21 and the first protrusion 31. This reduces the amount of first adhesive 40 poured before the first protrusion 31 is inserted into the first recess 21, and further reduces the degree or amount of first adhesive 40 overflowing from the first recess 21. When pouring the same volume of first adhesive 40, the third surface 313 being at least partially inclined relative to the second direction Y can retain more first adhesive 40 between the first protrusion 31 and the first recess 21 compared to the third surface 313 not being inclined at all relative to the second direction Y.

[0209] Please see Figure 16 At least a portion of the third surface 313 is inclined relative to the second direction Y, which allows the first protrusion 31 to have a wedge-shaped structure. The wedge-shaped structure experiences less resistance when extruding the fluid structure, and facilitates the insertion of the first protrusion 31 into the first recess 21 filled with the first adhesive 40.

[0210] In some embodiments, the first adhesive 40 is made of at least one of silicone, polyurethane, acrylate, and epoxy.

[0211] In some embodiments, please refer to Figure 13The distance between the first surface 311 and the fourth surface 211 in the second direction Y is the first distance D1, and the distance between the second surface 312 and the fifth surface 212 in the second direction Y is the second distance D2. The first distance D1 is less than the second distance D2. When the first distance D1 is less than the second distance D2, the space between the first surface 311 and the fourth surface 211 that can accommodate the first adhesive 40 is less than the space between the second surface 312 and the fifth surface 212 that can accommodate the first adhesive 40. This allows the first protrusion 31 to guide the first adhesive 40 towards the space between the second surface 312 and the fifth surface 212 when it is squeezed, thereby reducing the risk of the first adhesive 40 flowing into the accommodating space 230.

[0212] In some embodiments, please refer to Figure 13 Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases, and the first distance D1 is less than the second distance D2, which can further guide the first adhesive 40 to flow away from the receiving space 230, and further reduce the amount of the first adhesive 40 flowing towards the receiving space 230.

[0213] In some embodiments, please refer to Figure 17 When the first surface 311 and the fourth surface 211 are at least partially in contact, the first adhesive 40 can be prevented from flowing into the space between the first surface 311 and the fourth surface 211, thereby reducing the risk of the first adhesive 40 flowing into the receiving space 230.

[0214] In some embodiments, please refer to Figure 18 The fourth surface 211 is provided with a third recess 2111, which is recessed along the direction of the fifth surface 212 toward the fourth surface 211. The first surface 311 is provided with a second protrusion 3113 that mates with the third recess 2111, which protrudes along the direction of the fifth surface 212 toward the fourth surface 211. The mating of the third recess 2111 and the second protrusion 3113 can improve the mating effect between the first surface 311 and the fourth surface 211 and strengthen the bonding between the first protrusion 31 and the first recess 21. The mating of the third recess 2111 and the second protrusion 3113 also helps to reduce the risk of the first adhesive 40 flowing into the receiving space 230.

[0215] In some embodiments, please refer to Figure 17Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases, and the first surface 311 and the fourth surface 211 are at least partially connected, which can further suppress the flow of the first adhesive 40 into the position between the first surface 311 and the fourth surface 211, guide the first adhesive 40 to flow away from the receiving space 230, and further reduce the amount of the first adhesive 40 flowing towards the receiving space 230.

[0216] In some embodiments, please refer to Figure 13 and Figure 17 The second surface 312 is separated from the fifth surface 212, allowing the first protrusion 31 to guide the first adhesive member 40 into the position between the second surface 312 and the fifth surface 212 when it is inserted into the first recess 21, thereby reducing the risk of the first adhesive member 40 flowing into the receiving space 230. In embodiments where the first surface 311 and the fourth surface 211 are at least partially in contact, the separation of the second surface 312 and the fifth surface 212 also leaves space between the first protrusion 31 and the first recess 21 for the first adhesive member 40 to flow through, facilitating the insertion of the first protrusion 31 into the first recess 21.

[0217] In some embodiments, please refer to Figure 13 and Figure 17 Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases, and the second surface 312 is separated from the fifth surface 212, which can guide the first adhesive 40 to flow away from the receiving space 230, further reducing the amount of the first adhesive 40 flowing towards the receiving space 230.

[0218] In some embodiments, please refer to Figure 19 The first surface 311 includes a first region 3111 and a second region 3112 distributed along the first direction X. When viewed along the second direction Y, the projection of the first region 3111 overlaps with the projection of the fourth surface 211, while the projection of the second region 3112 is separate from the projection of the fourth surface 211. The separation of the projections of the second region 3112 and the fourth surface 211 means that the second region 3112 is located outside the first recess 21, and a step 60 is formed between the second region 3112 and the first housing 20 with the first recess 21. The step 60 can serve as a buffer area for the first adhesive 40 to flow into the receiving space 230 when it flows into the second region 3112 through the first region 3111 and the fourth surface 211, reducing the risk of the first adhesive 40 squeezing the cell unit 10.

[0219] In some embodiments, please refer to Figure 14The first extension 40a of the first adhesive 40 flows into the step 60, so that the step 60 can retain a portion of the first adhesive 40, thereby reducing the risk of the first adhesive 40 flowing out of the first housing 20 and the second housing 30.

[0220] In some embodiments, please refer to Figure 20 The first adhesive member 40 extends from the first region 3111 to the second region 3112. Specifically, the first adhesive member 40 includes a third extension 40c that partially overflows the first recess 21. The third extension 40c is located on the side of the second region 3112 of the first surface 311 facing away from the second surface 312, and it also connects to the first side surface 331. This arrangement allows sufficient space for the first adhesive member 40 between the first region 3111 and the fourth surface 211, improving the bonding strength between the first housing 20 and the second housing 30. Furthermore, see [reference needed]. Figure 21 The third extension 40c flowing into the second region 3112 can also fill the step 60 formed between the second region 3112 and the first housing 20, reducing the risk of damage to the battery housing 12 when the step 60 comes into contact with the battery cell unit 10.

[0221] In some embodiments, please refer to Figure 19 Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases, and the projection of the first region 3111 overlaps with the projection of the fourth surface 211, while the projection of the second region 3112 is separate from the projection of the fourth surface 211. The first inclined surface 3131 can guide the first adhesive 40 to flow away from the receiving space 230. Even if a small amount of the first adhesive 40 flows into the receiving space 230, the second region 3112 can act as a buffer area to reduce the risk of the first adhesive 40 squeezing the cell unit 10.

[0222] In some embodiments, please refer to Figure 19 The length of the first region 3111 along the first direction X is the third distance D3, and the distance between the first surface 311 and the sixth surface 213 along the first direction X is the fourth distance D4. The third distance D3 is greater than the fourth distance D4. When there is sufficient first adhesive 40 between the first region 3111 and the fourth surface 211, the length of the third distance D3 can be regarded as the length of the first adhesive 40 between the first region 3111 and the fourth surface 211, and the length of the fourth distance D4 can be regarded as the length of the first adhesive 40 between the first surface 311 and the sixth surface 213. Setting the third distance D3 to be greater than the fourth distance D4 can increase the area of ​​the first surface 311 and the fourth surface 211 bonded by the first adhesive 40, thereby improving the bonding strength between the first shell 20 and the second shell 30.

[0223] In some embodiments, please refer to Figure 19 The first distance D1 is less than the second distance D2, and along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases. The projection of the first region 3111 overlaps with the projection of the fourth surface 211, the projection of the second region 3112 is separate from the projection of the fourth surface 211, and the third distance D3 is greater than the fourth distance D4.

[0224] When the first distance D1 is less than the second distance D2, the space between the first surface 311 and the fourth surface 211 that can accommodate the first adhesive component 40 is less than the space between the second surface 312 and the fifth surface 212 that can accommodate the first adhesive component 40. This allows the first protrusion 31 to guide the first adhesive component 40 towards the space between the second surface 312 and the fifth surface 212 when it is squeezed, thereby reducing the risk of the first adhesive component 40 flowing into the receiving space 230. The first inclined surface 3131 can guide the first adhesive component 40 to flow away from the receiving space 230. Even if a small amount of the first adhesive component 40 flows into the receiving space 230, the second region 3112 can act as a buffer area to reduce the risk of the first adhesive component 40 squeezing the cell unit 10. The third distance D3 is greater than the fourth distance D4, which can increase the area of ​​the first surface 311 and the fourth surface 211 bonded by the first adhesive component 40, thereby increasing the bonding strength between the first housing 20 and the second housing 30.

[0225] In some embodiments, please refer to Figures 17 to 19 The first surface 311 and the fourth surface 211 are at least partially connected, and along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases. The projection of the first region 3111 overlaps with the projection of the fourth surface 211, the projection of the second region 3112 is separate from the projection of the fourth surface 211, and the third distance D3 is greater than the fourth distance D4.

[0226] When the first surface 311 and the fourth surface 211 are at least partially in contact, the flow of the first adhesive 40 between the first surface 311 and the fourth surface 211 can be suppressed, thereby reducing the risk of the first adhesive 40 flowing into the receiving space 230. The first inclined surface 3131 can guide the first adhesive 40 to flow away from the receiving space 230. Even if a small amount of the first adhesive 40 flows into the receiving space 230, the second region 3112 can act as a buffer area, reducing the risk of the first adhesive 40 squeezing the cell unit 10. The third distance D3 being greater than the fourth distance D4 can increase the area of ​​the first surface 311 and the fourth surface 211 bonded by the first adhesive 40, thereby increasing the bonding strength between the first housing 20 and the second housing 30.

[0227] In some embodiments, please refer to Figures 17 to 19The first region 3111 and the fourth surface 211 are separated, so that there is a first adhesive 40 between the first region 3111 and the fourth surface 211. Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually increases. The projection of the first region 3111 overlaps with the projection of the fourth surface 211. The projection of the second region 3112 is separated from the projection of the fourth surface 211. The third distance D3 is greater than the fourth distance D4.

[0228] The presence of a first adhesive element 40 between the first region 3111 and the fourth surface 211 enhances the bonding strength between the first housing 20 and the second housing 30. The first inclined surface 3131 guides the first adhesive element 40 away from the receiving space 230. Even if a small amount of the first adhesive element 40 flows into the receiving space 230, the second region 3112 acts as a buffer zone, reducing the risk of the first adhesive element 40 compressing the battery cell 10. The third distance D3 being greater than the fourth distance D4 increases the bonding area between the first surface 311 and the fourth surface 211 via the first adhesive element 40, thereby improving the bonding strength between the first housing 20 and the second housing 30.

[0229] In some embodiments, please refer to Figures 19 to 21 The eighth wall 30c and the third wall 20c are spaced apart in the first direction X.

[0230] Please see Figure 20 and Figure 21 The eighth wall 30c includes a first side surface 331, which extends along the second direction Y. The first side surface 331 is located on the side of the first surface 311 opposite to the second surface 312, and is in contact with the first surface 311. Viewed along the second direction Y, the first side surface 331 is separate from the first recess 21. A groove is formed between the first side surface 331, the first surface 311, and the third wall 20c forming the first recess 21 to facilitate the reception of the third extension 40c of the first adhesive member 40 and reduce the risk of the first adhesive member 40 entering the receiving space 230.

[0231] The eighth wall 30c also includes a second side surface 332, which extends along the second direction Y. The second side surface 332 is located on the side of the second surface 312 opposite to the first surface 311, and is in contact with the second surface 312. The second side surface 332 is separate from the first recess 21. A groove is formed between the second side surface 332, the second surface 312, and the third wall 20c forming the first recess 21 to facilitate the reception of the first adhesive member 40 and reduce the risk of the first adhesive member 40 overflowing out of the receiving space 230.

[0232] In some embodiments, please refer to Figure 21 and Figure 22The portion of the first side surface 331 facing the first housing 20 is provided with a second curved surface 3311. The second curved surface 3311 can be an arc-shaped surface formed by outward convexity or an arc-shaped surface formed by inward concavity.

[0233] Reference Figure 21 In the extreme case of a collision involving the battery module 100, the cell unit 10 may move within the accommodating space 230. When the second curved surface 3311 is configured as an outwardly convex arc surface, the risk of damage to the cell housing 12 and the second housing 30 during a collision can be reduced. (Refer to...) Figure 22 When the second curved surface 3311 is configured as an arc-shaped surface formed by concavity, the amount by which the third extension 40c of the first adhesive member 40 is accommodated between the first side surface 331 and the first housing 20 portion forming the first recess 21 can be increased. In some embodiments, refer to Figure 22 The third extension 40c is bonded to the second curved surface 3311 and fills the space formed by the concavity of the second curved surface 3311.

[0234] In some embodiments, please refer to Figures 20 to 22 The portion of the second side 332 facing the first housing 20 is provided with a third curved surface 3321. The third curved surface 3321 can be an arc-shaped surface formed by outward convexity or an arc-shaped surface formed by inward concavity.

[0235] In some embodiments, please refer to Figure 24 The third curved surface 3321 is an inwardly concave arc-shaped surface. The first adhesive member 40 also includes a fourth extension portion 40d, which is located between the fourth side surface 24 and the third curved surface 3321. The fourth extension portion 40d is bonded to the third curved surface 3321 and fills the space formed by the inward concavity of the third curved surface 3321. The third curved surface 3321 expands the space between the second side surface 332 and the first housing 20 forming the first recess 21, increasing the amount of the first adhesive member 40 that can be accommodated and further reducing the risk of the first adhesive member 40 overflowing. Furthermore, when the first adhesive member 40 needs to be injected or extracted from the outside to the inside, the inwardly concave arc-shaped surface of the third curved surface 3321 facilitates the formation of a groove between the second side surface 332, the second side surface 312, and the first housing 20 forming the first recess 21, thereby facilitating injection and extraction operations.

[0236] In some embodiments, please refer to Figures 20 to 22The third wall 20c of the first housing 20 also includes a third side surface 23, which extends along the second direction Y and is connected to the fourth surface 211. Viewed along the second direction Y, the third side surface 23 is exposed in the first recess 21 and is separate from the first side surface 331. Along the first direction X, the distance between the third side surface 23 and the first side surface 331 is a fifth distance D5. A groove is formed between the third side surface 23, the first side surface 331, and the first surface 311, which further facilitates the accommodation of the first adhesive member 40 and reduces the risk of the first adhesive member 40 compressing the battery cell unit 10 after entering the accommodating space 230.

[0237] In some embodiments, please refer to Figure 20 The distance between the first side 331 and the third side 23 in the first direction X is the fifth distance D5, and the distance between the second side 332 and the fourth side 24 in the first direction X is the sixth distance D6. The fifth distance D5 is greater than the sixth distance D6.

[0238] The fact that the fifth distance D5 is greater than the sixth distance D6 helps to further increase the amount of the first adhesive 40 overflowing from the first recess 21 that can be accommodated between the first side 331 and the third side 23, thereby reducing the risk of the first adhesive 40 contacting the battery cell 10. The area between the second side 332 and the fourth side 24 communicates with the outside of the accommodating space 230 and can be used to accommodate the first adhesive 40 overflowing from the first recess 21, which can reduce the risk of the overflowing first adhesive 40 being brought out of the first recess 21, and can also save the adhesive wiping process.

[0239] In some embodiments, please refer to Figure 20 Along the first direction X, the third wall 20c has a first length L1 from the third side surface 23 to the sixth side surface 213, and a second length L2 from the fourth side surface 24 to the sixth side surface 213, with the second length L2 being greater than the first length L1. This arrangement makes the portion of the third wall 20c away from the receiving space 230 longer than the portion of the third wall 20c adjacent to the receiving space 230, which helps reduce the overflow of the first adhesive 40 from the outside of the receiving space 230 and saves the adhesive application process. The portion of the third wall 20c adjacent to the receiving space 230 is shorter than the portion of the third wall 20c away from the receiving space 230, which can increase the amount of adhesive between the first side surface 331 and the third side surface 23, reducing the risk of the first adhesive 40 overflowing and thus reducing the risk of cell corrosion.

[0240] In some embodiments, please refer to Figure 21 and Figure 22The first housing 20 also includes a fourth curved surface 231, which is located between the third side surface 23 and the fourth surface 211 and connects the third side surface 23 and the fourth surface 211. The fourth curved surface 231 can be an arc-shaped surface formed by outward convexity or an arc-shaped surface formed by inward concavity.

[0241] When the fourth curved surface 231 is configured as an outwardly convex arc-shaped surface, the fourth curved surface 231 can guide the first protrusion 31 during insertion, making it easier for the first protrusion 31 to align and extend into the first recess 21. In addition, both when the fourth curved surface 231 is configured as an outwardly convex arc-shaped surface and when the fourth curved surface 231 is configured as an inwardly concave arc-shaped surface, the amount of space between the first side surface 331 and the third side surface 23 that accommodates the first adhesive member 40 can be increased.

[0242] In some embodiments, please refer to Figure 20 The first housing 20 includes a fourth side surface 24 extending along the second direction Y and abutting a fifth surface 212. Viewed along the second direction Y, the fourth side surface 24 is exposed in the first recess 21 and is separated from the second side surface 331. Along the first direction X, the distance between the fourth side surface 24 and the second side surface 332 is a sixth distance D6. A groove is formed between the fourth side surface 24, the second side surface 332, and the second surface 312, which further facilitates the accommodation of the first adhesive member 40 and reduces the risk of the first adhesive member 40 overflowing the accommodating space 230.

[0243] In some embodiments, please refer to Figure 21 and Figure 22 The first housing 20 also includes a fifth curved surface 241, which is located between the fourth side surface 24 and the fifth surface 212, and connects the fourth side surface 24 and the fifth surface 212. The fifth curved surface 241 can be an outwardly convex arc-shaped surface or an inwardly concave arc-shaped surface. When the fifth curved surface 241 is set as an outwardly convex arc-shaped surface, it can guide the first adhesive 40 to flow away from the receiving space 230, filling the space between the fourth curved surface 24 and the second side surface 332. When the fifth curved surface 241 is set as an inwardly concave arc-shaped surface, it can increase the amount of the first adhesive 40 retained in the first recess 21, and improve the bonding strength between the first housing 20 and the second housing 30.

[0244] In some embodiments, please refer to Figures 20 to 22 A first adhesive member 40 is provided between the second surface 312 and the fifth surface 212. When viewed along the second direction Y, the first adhesive member 40 between the second surface 312 and the fifth surface 212 has a first gap 401. The first gap 401 can reduce the overall weight of the battery module 100, thereby increasing the energy density of the battery module 100.

[0245] The first gap 401 can be formed by extracting or inflating the first adhesive member 40. Specifically, after the first protrusion 31 is inserted into the first recess 21, the first adhesive member 40 is partially extracted by inserting an extraction device between the second side surface 332 and the fourth side surface 24, or air is injected into the first adhesive member 40 by inserting an air injection device between the second side surface 332 and the fourth side surface 24, and the excess first adhesive member 40 is squeezed out, thereby forming the first gap 401 between the first adhesive member 40 between the second side surface 312 and the fifth side surface 212.

[0246] In some embodiments, please refer to Figures 20 to 22 A first adhesive member 40 is provided between the first surface 311 and the fourth surface 211. When viewed along the second direction Y, the first adhesive member 40 between the first surface 311 and the fourth surface 211 has a second gap 402. The second gap 402 can reduce the overall weight of the battery module 100, thereby increasing the energy density of the battery module 100.

[0247] The second gap 402 can be formed by extracting the first adhesive 40. Specifically, the first housing 20 and the second housing 30 are frame structures that allow the extraction device to extend between the first side 331 and the third side 23 to partially extract the first adhesive 40. Alternatively, air can be injected into the first adhesive 40 between the first side 331 and the third side 23 through an air injection device to squeeze out excess first adhesive 40, thereby forming the second gap 402 between the first adhesive 40 between the first surface 311 and the fourth surface 211.

[0248] In some embodiments, please refer to Figure 22The third surface 313 also includes a second inclined surface 3134, which is inclined relative to the first inclined surface 3131. Along the first direction X, the projection length of the first inclined surface 3131 onto the sixth surface 213 along the second direction Y is greater than the projection length of the second inclined surface 3134 onto the sixth surface 213 along the second direction Y. This arrangement allows the first inclined surface 3131 to hold more of the first adhesive member 40. By controlling the inclination direction of the first inclined surface 3131, the position of the first adhesive member 40 can be controlled. As the distance between the first inclined surface 3131 and the sixth surface 213 gradually increases along the first surface 311 towards the second surface 312 in the first direction X, it is beneficial for the first inclined surface 3131 to hold more of the first adhesive member 40 within the first recess 21 closer to the outside of the receiving space 230, thus helping to prevent the first adhesive member 40 from entering the receiving space 230. As the distance between the first inclined surface 3131 and the sixth surface 213 gradually decreases in the first direction X along the direction from the first surface 311 to the second surface 312, it is beneficial for the first inclined surface 3131 to press more of the first adhesive 40 into the first recess 21 and closer to the inside of the receiving space 230, which helps to prevent the first adhesive 40 from overflowing out of the receiving space 230.

[0249] In some embodiments, please refer to Figure 24 and Figure 25 The third surface 313 includes a second recess 3132, which is connected to the first surface 311. After the first protrusion 31 is inserted into the first recess 21, a second space 10b for storing the first adhesive 40 is formed between the second recess 3132 and the first recess 21. The concave shape of the second recess 3132 can retain the first adhesive 40 in the second space 10b, which helps to increase the amount of adhesive remaining between the first recess 21 and the first protrusion 31, thereby reducing the amount of the first adhesive 40 poured before the first protrusion 31 is inserted into the first recess 21. Furthermore, it helps to reduce the risk of the first adhesive 40 overflowing from the first recess 21 or reduce the amount of the first adhesive 40 overflowing.

[0250] In some embodiments, see 24 and Figure 25 The third surface 313 includes a first inclined surface 3131 and a second recess 3132, the second recess 3132 being in contact with both the first surface 311 and the first inclined surface 3131. In some other embodiments, the second recess 3132 is directly disposed on the first inclined surface 3131 and is not in contact with the first surface 311.

[0251] In some embodiments, please refer to Figure 24 and Figure 25The second recess 3132 is connected to the first surface 311, and the portion of the second recess 3132 that is connected to the first surface 311 is provided with a first curved surface 3133. The first curved surface 3133 can be an outwardly convex arc surface or an inwardly concave arc surface. When the first curved surface 3133 is set as an outwardly convex arc surface, the first protrusion 31 forms an "S"-shaped streamlined portion, which can reduce the resistance of the first protrusion 31 during the insertion process when the first protrusion 31 is inserted into the first recess 21 filled with the first adhesive 40. When the first curved surface 3133 is set as an inwardly concave arc surface, the second space 10b between the first protrusion 31 and the first recess 21 can be further expanded, increasing the adhesive capacity.

[0252] In some embodiments, please refer to Figure 24 and Figure 25 Along the direction from the first surface 311 to the second surface 312, the distance between the first inclined surface 3131 and the sixth surface 213 in the first direction X gradually changes, and the third surface 313 includes a second recess 3132, which is in contact with both the first surface 311 and the first inclined surface 3131.

[0253] In some embodiments, please refer to Figure 24 and Figure 25 The first surface 311 is separate from the fourth surface 211, and the third surface 313 includes a second recess 3132, which is connected to both the first surface 311 and the first inclined surface 3131.

[0254] In some embodiments, please refer to Figure 25 The second surface 312 is at least partially connected to the fifth surface 212, and the third surface 313 includes a second recess 3132, which is connected to both the first surface 311 and the first inclined surface 3131.

[0255] In some embodiments, during the assembly process (combining the first housing 20 and the second housing 30), a first adhesive 40, which is a fluid adhesive, can be injected into the first recess 21 beforehand. During the insertion of the first protrusion 31 into the first recess 21, the first protrusion 31 compresses the first adhesive 40, causing it to flow into the space between the first protrusion 31 and the first recess 21. At least a portion of the third surface 313 is inclined relative to the second direction Y, allowing the first protrusion 31 to have a wedge-shaped structure. This wedge-shaped structure makes it easier for the first protrusion 31 to be pressed into the first recess 21 containing the first adhesive 40. After the first protrusion 31 is inserted into the first recess 21, a first space 10a for storing the first adhesive 40 is formed between the inclined portion of the third surface 313 and the first recess 21. The inclined portion of the third surface 313 presses the first adhesive 40 into the first space 10a, which can increase the amount of adhesive remaining between the first recess 21 and the first protrusion 31. This reduces the amount of first adhesive 40 poured before the first protrusion 31 is inserted into the first recess 21, and further reduces the degree or amount of first adhesive 40 overflowing from the first recess 21. When pouring the same volume of first adhesive 40, the third surface 313 being at least partially inclined relative to the second direction Y allows more first adhesive 40 to be retained between the first protrusion 31 and the first recess 21 compared to the third surface 313 not being inclined at all relative to the second direction Y.

[0256] The state in which the first protrusion 31 is inserted into the first recess 21 can be interpreted as follows: at least a portion of the third surface 313 of the first protrusion 31 abuts against the inner wall of the first recess 21, thereby preventing the first protrusion 31 from continuing to move along the direction of insertion into the first recess 21. The state in which the first protrusion 31 is inserted into the first recess 21 can also be interpreted as follows: due to the presence of the first adhesive member 40, after the first recess 31 is inserted into the first recess 21 to a predetermined depth, the first adhesive member 40 prevents the first protrusion 31 from continuing to move along the direction of insertion into the first recess 21, causing at least a portion of the third surface 313 of the first protrusion 31 to separate from the inner wall of the first recess 21. The state in which the first protrusion 31 is inserted into the first recess 21 can also be interpreted as follows: after the first protrusion 31 is inserted into the first recess 21 to a predetermined depth, the portion of the first housing 20 located outside the first recess 21 and the portion of the second housing 30 located outside the first recess 21 abut against each other, thereby preventing the first protrusion 31 from continuing to move along the direction of insertion into the first recess 21.

[0257] In some embodiments, the first surface 311 and the fourth surface 211 are at least partially connected, so that when the first protrusion 31 is inserted into the first recess 21, the first protrusion 31 can easily enter the first recess 21 along the extension direction of the fourth surface 211. It also allows the operator to more intuitively feel whether the first protrusion 31 and the first recess 21 are properly aligned, thereby improving the efficiency and accuracy of shell assembly.

[0258] Please see Figure 26 The embodiments of this application also provide an electrical device 1000, which includes a battery module 100 as described in any of the above embodiments, and the battery module 100 is mounted on the device body 200. The battery module 100 of the electrical device 100 uses less potting compound, reducing the production cost of the battery module 100 and also reducing the risk of overflow of the first adhesive component 40, thus improving the reliability of the battery module 100, thereby reducing the production cost of the electrical device 1000 and improving its reliability.

[0259] Since the electrical equipment 1000 adopts the technical solution of any of the above-described embodiments of the battery module 100, it has at least the beneficial effects brought about by the technical solution of any of the above-described embodiments, which will not be described in detail here.

[0260] Electrical equipment 1000 can be drones, power tools, two-wheeled electric vehicles, cleaning robots, energy storage devices, etc.

[0261] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery module, characterized in that, It includes a first housing, a second housing, a first adhesive component, and a battery cell unit; The first housing includes a first recess; The second housing and the first housing surround a receiving space, and the battery cell is installed in the receiving space. The second housing includes a first protrusion, which extends along a first direction and is inserted into the first recess. The first protrusion is bonded to the first recess by the first adhesive; The first protrusion includes a first surface, a second surface, and a third surface. The first surface faces the battery cell unit. The second surface is arranged along a second direction perpendicular to the first direction. Along the second direction, the orientation of the second surface is opposite to that of the first surface. The third surface is in contact with both the first and second surfaces, and at least a portion of the third surface is inclined relative to the second direction. The first recess includes a fourth surface, a fifth surface, and a sixth surface. Along the second direction, the fourth surface is opposite to the first surface, and the fifth surface is opposite to the second surface. The sixth surface is in contact with both the fourth and fifth surfaces. Along the first direction, the sixth surface is opposite to the third surface. The third surface includes a first inclined surface. Along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

2. The battery module according to claim 1, characterized in that, The third surface also includes a second recess, which is in contact with both the first surface and the first inclined surface.

3. The battery module according to claim 2, characterized in that, The portion of the second recess that connects with the first surface is provided with a first curved surface.

4. The battery module according to claim 1, characterized in that, The first surface includes a first region and a second region arranged along a first direction. When viewed along the second direction, the projection of the first region overlaps with the projection of the fourth surface, and the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is the third distance, the distance between the first surface and the sixth surface in the first direction is the fourth distance, and the third distance is greater than the fourth distance.

5. The battery module according to claim 1, characterized in that, The distance between the first surface and the fourth surface in the second direction is the first distance, and the distance between the second surface and the fifth surface in the second direction is the second distance. The first distance is less than the second distance.

6. The battery module according to claim 5, characterized in that, The first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along the first direction; The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface toward the second surface.

7. The battery module according to claim 6, characterized in that, Along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

8. The battery module according to claim 7, characterized in that, The first surface includes a first region and a second region arranged along a first direction. When viewed along the second direction, the projection of the first region overlaps with the projection of the fourth surface, and the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is the third distance, the distance between the first surface and the sixth surface in the first direction is the fourth distance, and the third distance is greater than the fourth distance.

9. The battery module according to claim 1, characterized in that, The first surface is at least partially in contact with the fourth surface.

10. The battery module according to claim 9, characterized in that, The first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along the first direction; The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface toward the second surface.

11. The battery module according to claim 10, characterized in that, The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually increases along the direction from the first surface toward the second surface.

12. The battery module according to claim 11, characterized in that, The first surface includes a first region and a second region arranged along a first direction. When viewed along the second direction, the projection of the first region overlaps with the projection of the fourth surface, and the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is the third distance, the distance between the first surface and the sixth surface in the first direction is the fourth distance, and the third distance is greater than the fourth distance.

13. The battery module according to claim 1, characterized in that, The second surface is separate from the fifth surface.

14. The battery module according to claim 13, characterized in that, The first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along the first direction; The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface toward the second surface.

15. The battery module according to claim 14, characterized in that, Along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

16. The battery module according to claim 15, characterized in that, The first surface includes a first region and a second region arranged along a first direction. When viewed along the second direction, the projection of the first region overlaps with the projection of the fourth surface, and the projection of the second region is separate from the projection of the fourth surface. The length of the first region along the first direction is the third distance, the distance between the first surface and the sixth surface in the first direction is the fourth distance, and the third distance is greater than the fourth distance.

17. The battery module according to claim 1, characterized in that, The first surface includes a first region and a second region distributed along the first direction. When viewed along the second direction, the projection of the first region overlaps with the projection of the fourth surface, while the projection of the second region is separate from the projection of the fourth surface.

18. The battery module according to claim 17, characterized in that, The first adhesive extends from the first region to the second region.

19. The battery module according to claim 17, characterized in that, The first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along the first direction; The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually changes along the direction from the first surface toward the second surface.

20. The battery module according to claim 19, characterized in that, Along the direction from the first surface to the second surface, the distance between the first inclined surface and the sixth surface gradually increases in the first direction.

21. The battery module according to claim 20, characterized in that, The third surface also includes a second recess, which is in contact with both the first surface and the first inclined surface.

22. The battery module according to claim 21, characterized in that, The portion of the second recess that connects with the first surface is provided with a first curved surface.

23. The battery module according to claim 20, characterized in that, The length of the first region along the first direction is the third distance, the distance between the first surface and the sixth surface in the first direction is the fourth distance, and the third distance is greater than the fourth distance.

24. The battery module according to claim 1, characterized in that, The first housing also includes a third side and a fourth side. The third side is connected to the fourth side. When viewed along the second direction, the third side is exposed in the first recess. The fourth side is connected to the fifth side. When viewed along the second direction, the fourth side is exposed in the first recess.

25. The battery module according to claim 24, characterized in that, The second housing also includes a first side surface, which is in contact with the first surface. When viewed along the second direction, the first side surface is separate from the first recess.

26. The battery module according to claim 25, characterized in that, The portion of the first side facing the first housing is provided with a second curved surface.

27. The battery module according to claim 25, characterized in that, The second housing also includes a second side surface, which is in contact with the second surface. When viewed along the second direction, the second side surface is separate from the first recess.

28. The battery module according to claim 27, characterized in that, The portion of the second side facing the first housing is provided with a third curved surface.

29. The battery module according to claim 27, characterized in that, The distance between the first side and the third side in the first direction is a fifth distance, and the distance between the second side and the fourth side in the first direction is a sixth distance, wherein the fifth distance is greater than the sixth distance.

30. The battery module according to claim 24, characterized in that, The first housing also includes a fourth curved surface, which is located between the third side surface and the fourth surface, and connects the third side surface and the fourth surface.

31. The battery module according to claim 24, characterized in that, The first housing also includes a fifth curved surface, which is located between the fourth side surface and the fifth surface, and connects the fourth side surface and the fifth surface.

32. The battery module according to claim 1, characterized in that, The first recess further includes a sixth surface, which is in contact with both the fourth and fifth surfaces, and is disposed opposite to the third surface along the first direction; The third surface includes a first inclined surface, and the distance between the first inclined surface and the sixth surface gradually decreases in the first direction along the direction from the first surface toward the second surface.

33. The battery module according to claim 1, characterized in that, The first adhesive is disposed between the second surface and the fifth surface. When viewed along the second direction, the first adhesive between the second surface and the fifth surface has a first gap.

34. The battery module according to claim 1, characterized in that, The first adhesive is provided between the first surface and the fourth surface. When viewed along the second direction, the first adhesive between the first surface and the fourth surface has a second gap.

35. The battery module according to claim 1, characterized in that, The third surface includes a second recess, which is connected to the first surface.

36. The battery module according to claim 35, characterized in that, The portion of the second recess that connects with the first surface is provided with a first curved surface.

37. The battery module according to claim 1, characterized in that, The first adhesive is made of at least one of silicone, polyurethane, acrylate, and epoxy.

38. An electrical device, comprising a device body and a battery module as described in any one of claims 1 to 37, characterized in that, The battery module is installed on the main body of the device.

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