Battery pack and powered device

Abstract

The application provides a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises a box body with a containing cavity; a battery assembly is arranged in the containing cavity, and the battery assembly comprises a battery and an insulating film. The battery comprises a shell. The insulating film covers the outer surface of the shell, and a hollow region is formed in the insulating film. The outer surface of the shell comprises a window region exposed from the hollow region. A coating layer is coated on the window region. A support plate is arranged in the containing cavity and located on the side of the shell to which the coating layer is applied. At least part of the support plate is connected with the coating layer. The battery pack provided by the application can ensure the shearing strength of the connection between the support plate and the battery shell by coating the coating layer on the window region of the battery shell, and the adhesive force of the coating layer is greater than that of the insulating film, so that the overall stability of the battery pack is improved.

Description

Technical Field

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

[0002] Currently, an increasing number of electrical devices, such as new energy vehicles, energy storage cabinets, and communication base stations, are using battery packs as energy storage and supply devices. A battery pack typically contains a battery assembly composed of multiple batteries. When assembling into a battery pack, the batteries are usually arranged in sequence, and each battery is covered with an insulating film layer (such as a blue film or a sprayed coating). The battery pack is then bonded and fixed to the surrounding side plates, end plates, and base plate.

[0003] However, due to various factors, the side plates, end plates, and bottom plates often have concave and convex structures, heat dissipation fins, etc., which can lead to irregular shapes of the bonding interface, uneven application of adhesive, local voids, and insufficient shear strength. This can result in unstable battery installation and affect the stability of the battery pack. Utility Model Content

[0004] In view of the above problems, this application provides a battery pack and an electrical device that can enhance the connection stability of the support plate and the battery assembly, thereby improving the stability of the battery pack.

[0005] In a first aspect, this application provides a battery pack, comprising: a housing having a receiving cavity; a battery assembly disposed within the receiving cavity, the battery assembly comprising: a battery including a housing; an insulating film covering the outer surface of the housing, the insulating film having a perforated area, the outer surface of the housing including a window area exposed from the perforated area; a coating applied to the window area; and a support plate disposed within the receiving cavity and located on the side of the housing coated with the coating, and at least a portion of the support plate being connected to the coating.

[0006] In one possible implementation, the battery has a height direction, the housing includes a first sidewall perpendicular to the height direction and a second sidewall disposed on at least one side of the first sidewall in a circumferential direction; the insulating film includes a first covering area corresponding to the first sidewall and a second covering area corresponding to the second sidewall, and the hollow area is disposed on at least one of the first covering area and the second covering area.

[0007] In one possible implementation, the first covering area has a first hollow area, the surface of the housing includes a first window area exposed from the first hollow area, the coating includes a first coating applied to the first window area; the support plate includes a first side plate, a portion of the first side plate being in contact with the first coating.

[0008] In one possible implementation, the second covering area has a second hollow area, the surface of the housing includes a second window area exposed from the second hollow area, the coating includes a second coating applied to the second window area; the support plate includes a second side plate, the second side plate is disposed on the side of the battery, and a portion of the second side plate contacts the second coating.

[0009] In one possible implementation, the battery has a width direction perpendicular to the height direction, along which the thickness of the coating decreases from the edge to the center.

[0010] In one possible implementation, the battery has a width direction perpendicular to the height direction, and along the width direction, the coating has a uniform thickness from the edge to the center, and the thickness D1 of the coating and the thickness D2 of the insulating film satisfy: D1 < D2.

[0011] In one possible implementation, the support plate has a raised structure and a recessed structure on one side surface facing the battery assembly, the raised structure and the recessed structure are arranged adjacent to each other, and there is at least one raised structure and one recessed structure; the coating includes a recessed region and a raised region, wherein the recessed region is opposite to and connected to the raised structure, and the raised region is opposite to and connected to the recessed structure.

[0012] In one possible implementation, the battery has a width direction perpendicular to the height direction, and the protruding structures and the recessed structures are staggered along the width direction of the battery; the recessed regions and the protruding regions are staggered along the width direction.

[0013] In one possible implementation, the support plate has a raised structure on one side surface facing the battery assembly, and the coating includes a raised region opposite to and connected to the raised structure.

[0014] In one possible implementation, the inner side of the support plate is provided with cooling channels, which are arranged opposite to the protruding structure.

[0015] In one possible implementation, the battery pack further includes an adhesive layer, through which the support plate is connected to the coating.

[0016] Secondly, embodiments of this application provide an electrical device including a battery pack provided in any of the first aspects described above.

[0017] This application provides a battery pack and an electrical device. The battery pack forms insulation protection for the battery by covering the outer surface of the battery casing with an insulating film. The insulating film has a partially perforated area, forming a window area on the outer surface of the battery casing in the perforated area. A coating is applied to the window area. The adhesion of the coating is greater than that of the insulating film, and it has high shear strength. This ensures the shear strength at the connection between the support plate and the outer surface of the corresponding coating on the casing, avoiding local voids. Furthermore, the coating is not easily broken when subjected to external shear forces, thereby improving the overall stability of the battery pack. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery pack provided in this application;

[0020] Figure 2 This is a schematic diagram of the assembly of the battery assembly and the first side panel of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the battery assembly provided in this application;

[0022] Figure 4 A schematic diagram of one embodiment of the coating of the battery assembly provided in this application;

[0023] Figure 5 for Figure 4 A schematic diagram showing the coating applied to the first sidewall of the battery;

[0024] Figure 6 for Figure 4 A schematic diagram showing the coating applied to the second sidewall of the battery;

[0025] Figure 7 A schematic diagram of another embodiment of the coating of the battery assembly provided in this application;

[0026] Figure 8 for Figure 7 A schematic diagram showing the coating applied to the first sidewall of the battery;

[0027] Figure 9 for Figure 7 A schematic diagram showing the coating applied to the second sidewall of the battery;

[0028] Figure 10 for Figure 7 A schematic diagram of the assembly of the battery components and the support plate.

[0029] Figure 11 for Figure 7 A schematic diagram of the assembly of the battery assembly and the support plate from another angle;

[0030] Figure 12 A schematic diagram of yet another embodiment of the coating for the battery assembly provided in this application;

[0031] Figure 13 for Figure 12 A schematic diagram showing the coating applied to the first sidewall of the battery;

[0032] Figure 14 A schematic diagram of the structure of one embodiment of the support plate provided in this application;

[0033] Figure 15 An assembly diagram of one embodiment of the battery assembly and support plate provided in this application;

[0034] Figure 16 A schematic diagram of the assembly of the battery assembly and the liquid cooling plate serving as the base plate provided in this application;

[0035] Figure 17 A schematic diagram of yet another embodiment of the coating provided in this application;

[0036] Figure 18 A schematic diagram of yet another embodiment of the coating provided in this application;

[0037] Figure 19 A schematic diagram of yet another embodiment of the coating provided in this application;

[0038] Figure 20 This is an assembly diagram of yet another embodiment of the battery assembly and support plate provided in this application;

[0039] Figure 21 A schematic diagram of yet another embodiment of the coating provided in this application;

[0040] Figure 22 A schematic diagram of the electrical equipment provided in this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100 - Battery assembly; 110 - Battery; 111 - Housing; 112 - First sidewall; 113 - Second sidewall; 120 - Insulating film; 1201 - Hollowed-out area; 12011 - First hollowed-out area; 12012 - Second hollowed-out area; 121 - First covering area; 122 - Second covering area; 130 - Coating; 131 - First coating; 132 - Second coating; 133 - Recessed area; 134 - Raised area;

[0043] 200 - Support plate; 201 - Protruding structure; 202 - Recessed structure; 210 - First side plate; 220 - Second side plate; 230 - Cooling channel;

[0044] 300 - Window area; 310 - First window area; 320 - Second window area;

[0045] 400 - Adhesive layer;

[0046] 500 - Box body; 501 - Receiving cavity;

[0047] 1000-battery pack;

[0048] 2000 - Electrical equipment. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0050] Currently, an increasing number of electrical devices, such as new energy vehicles, energy storage cabinets, and communication base stations, are using battery packs as energy storage and supply devices. A battery pack typically contains a battery assembly composed of multiple batteries. When assembling the battery pack, the batteries are usually arranged sequentially, and each battery is covered with an insulating film layer (such as a blue film or a sprayed coating). The battery pack is then bonded to the surrounding side plates, end plates, and base plate. However, due to various factors, the side plates, end plates, and base plate often have irregular shapes, heat dissipation fins, etc., leading to irregular bonding interface shapes, uneven adhesive application, and problems such as localized voids and insufficient shear strength, affecting the stability of the battery pack.

[0051] To overcome the shortcomings of existing technologies, the battery pack provided in this application embodiment comprises a housing, a battery, an insulating film, a coating, and a support plate. The battery and support plate are housed within the housing cavity of the housing. The insulating film covers the outer surface of the battery casing, providing insulation and protection. The insulating film has perforated areas, forming window areas on the outer surface of the battery casing within these perforated areas. A coating is applied to these window areas, providing protection for the battery within these areas. The support plate is mounted on the outer periphery of the battery and contacts the coating. Since the insulating film is mostly smooth, its adhesion is relatively poor. Therefore, the coating has greater adhesion than the insulating film and exhibits higher shear strength. This ensures the shear strength (i.e., adhesive strength) at the connection between the support plate and the corresponding coated outer surface of the battery casing, preventing localized voids. Furthermore, when the battery is subjected to external shear forces, the coating is less prone to cracking, thereby improving the overall stability of the battery pack.

[0052] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0053] For ease of explanation and understanding, please refer to... Figure 1 and 3 In this paper, the height direction of the battery 110 can be the Z direction, the width direction of the battery 110 can be the Y direction, and the length direction of the battery 110 can be the X direction.

[0054] Combination Figures 1 to 22 As shown, the battery pack 1000 in this embodiment may include: a housing 500, a battery assembly 100, and a support plate 200.

[0055] The housing 500 can serve as the main frame of the battery pack 1000. The housing 500 may have a receiving cavity 501 inside, which can be used to house the battery assembly 100, the support plate 200, and various functional components of the battery pack such as the power distribution device and the cooling device. Optionally, the housing 500 can be square or other shapes.

[0056] Optionally, the housing 500 may include a bottom shell and a cover plate, the bottom shell defining a receiving cavity 501 with an open top, and the cover plate may be used to seal the open top so that the receiving cavity 501 forms a relatively closed cavity.

[0057] Optionally, when the battery pack 1000 is applied to a vehicle, the housing 500 can be a structural component independent of the vehicle chassis, or, in some possible examples, the housing 500 can also be formed as an integral structure with the chassis, as part of the chassis, and this application does not limit this.

[0058] Battery assembly 100 is a component within battery pack 1000 that performs energy storage and functions. Battery assembly 100 is disposed within the receiving cavity 501 of housing 500. Multiple battery assemblies 100 may be disposed within battery pack 1000. For example, multiple battery assemblies 100 may be arranged along the width direction of battery 110 (e.g., ...). Figure 3 The battery pack consists of multiple battery modules arranged side-by-side (in the Y direction) and connected in series and parallel via busbars or other current-carrying structures to form a unified system capable of exchanging electrical energy with the outside world. Optionally, the battery pack may include one or more battery modules. A battery module may be formed by multiple battery components arranged side-by-side and connected, such as... Figure 1 and Figure 2 As shown.

[0059] In this embodiment, the battery assembly 100 may include a battery 110, an insulating film 120, and a coating 130. The battery 110 includes a housing 111 and a battery cell disposed within the housing 111. Exemplarily, the housing 111 may be a steel housing, an aluminum housing, or a housing made of other materials, and the cross-section of the housing 111 may be square, circular, or other shapes. The housing 111 has a cell cavity, and the battery cell is disposed within the cell cavity. The battery cell may be a laminated cell or a wound cell.

[0060] Taking a stacked battery cell as an example, the battery cell may include a positive electrode, a negative electrode, and a separator. There are multiple positive and negative electrodes, and the positive and negative electrodes can be stacked alternately. The separator is placed between adjacent positive and negative electrodes to prevent direct contact between the positive and negative electrodes from causing a short circuit.

[0061] Taking a wound battery cell as an example, the battery cell can include a positive electrode, a negative electrode, and a separator. The positive electrode, separator, and negative electrode are stacked in sequence and then wound to form a wound battery cell with an elongated oval cross-section.

[0062] The positive electrode may include a positive current collector and a positive active layer. The positive current collector may be aluminum foil, and the active material in the positive active layer may include at least one of lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4 or LFP), and lithium nickel manganese cobalt oxide (LiNiMnCoO2 or NMC). The negative electrode may include a negative current collector and a negative active layer. The negative current collector may be copper foil, and the main material of the negative active layer may be made of carbon-based materials such as graphite, silicon, or a combination of both.

[0063] The cell cavity is also filled with electrolyte, which can serve as a medium for ion transport, establishing a conductive channel between the positive and negative electrodes. At the same time, it ensures stable battery operation by forming a protective film and thermal management.

[0064] The insulating film 120 covers the outer surface of the housing 111. The insulating film 120 can be a plastic film, such as a film structure made of high-strength polymers like polyimide (PI) or polyester (PET). The insulating film 120 can protect the battery 110, preventing short circuits or damage caused by friction or collisions during transportation. It can also provide electrical insulation between batteries 110 and between batteries 110 and other electrical components, reducing the risk of short circuits inside the battery pack 1000.

[0065] A hollow area 1201 can be formed on the insulating film 120. The hollow area 1201 can be square, circular, elliptical or any other shape. At this time, the outer surface of the housing 111 includes a window area 300 exposed from the hollow area 1201. The coating 130 can be applied to the window area 300. In other words, the insulating film 120 does not completely cover the outer surface of the housing 111 of the battery 110. It should be noted that the hollow area 1201 here is not an area enclosed by different edges of the complete insulating film 120, but a gap area formed by removing part of the insulating film 120 by punching or other means. The gap area can be located at the edge of the insulating film 120 in the unfolded state, or it can be spaced apart from the edge in the unfolded state.

[0066] Optionally, the coating 130 may completely cover the window area 300 or only cover a portion of the window area 300; this embodiment does not impose any limitations on this. Optionally, the area of ​​the hollowed-out area 1201 may be smaller than the area of ​​the side of the housing 111 corresponding to the hollowed-out area 1201. It is understood that the coating 130 is also an insulating coating, so the coating 130 can also cooperate with the insulating film 120 to jointly protect the battery 110.

[0067] The support plate 200 is disposed in the receiving cavity 501. The support plate 200 is located on the side of the housing 111 coated with the coating 130. At least a portion of the support plate 200 is connected to the coating 130. For example, the support plate 200 can directly contact and connect with the coating 130, or the support plate 200 can also achieve a pressure fit or connection with the coating 130 through an intermediate structure to transmit pressure.

[0068] When the battery 110 is assembled, the exposed surface of the casing 111 in the window area 300 contacts the support plate 200 inside the housing 500 through the coating 130. Since the insulating film 120 is mostly a smooth surface, the adhesion of the coating 130 is greater than that of the insulating film 120, resulting in higher shear strength. This enhances the bonding strength between the battery 110 and the support plate 200, thereby improving the stability of the battery pack 1000.

[0069] The battery pack 1000 of this application embodiment forms an insulating protection for the battery 110 by covering the outer surface of the casing 111 of the battery 110 with an insulating film 120. A hollow area 1201 is provided in a part of the insulating film 120. The outer surface of the casing 111 of the battery 110 has a window area 300 exposed from the hollow area 1201. By coating a coating 130 on the window area 300, the adhesion of the coating 130 is greater than that of the insulating film 120, and the shear strength is high. This can ensure the shear strength and bonding strength at the connection between the support plate 200 and the outer surface of the corresponding coating 130 of the casing 111, avoid local voids, and the coating 130 is not easy to crack or fall off when subjected to external shear force, thereby improving the overall stability of the battery pack 1000.

[0070] In some embodiments, the ratio of the total area of ​​coating 130 to the total area of ​​window area 300 is in the range of 0.3-1. For example, the ratio of the total area of ​​coating 130 to the total area of ​​window area 300 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1. Of course, this application does not limit this, and the ratio of the total area of ​​coating 130 to the total area of ​​window area 300 can be flexibly selected within the above range according to actual needs.

[0071] In this way, on the one hand, it prevents the total area of ​​coating 130 from being too small when the ratio is too small, resulting in insufficient adhesion between coating 130 and support plate. On the other hand, it avoids the coating 130 area from exceeding the edge of window area 300, which would cause coating 130 to accumulate on the surface of insulating film 120 or cause edge overflow.

[0072] In one possible implementation, combining Figures 1 to 3 As shown, the housing 111 includes a first sidewall 112 perpendicular to the height direction of the battery 110 and a second sidewall 113 disposed on at least one side of the first sidewall 112 along the circumferential direction.

[0073] Combination Figure 1 and Figure 3 As shown, with the height direction of battery 110 as... Figure 3 In the Z direction, the length direction of battery 110 is Figure 3 The X-axis and the width direction of battery 110 are... Figure 3 Taking the Y-direction as an example, the casing 111 of the battery 110 may include a bottom surface, a top surface opposite to the bottom surface, two side surfaces connected between the top surface and the bottom surface and arranged opposite to each other, and two end surfaces arranged opposite to each other. The first side wall 112 may include the bottom surface and the top surface of the casing 111, and the second side wall 113 may include two side surfaces arranged opposite to each other along the width direction and two end surfaces arranged opposite to each other along the length direction. The first side wall 112 and the second side wall 113 together enclose and form the casing 111.

[0074] The insulating film 120 includes a first covering area 121 and a second covering area 122. The first covering area 121 corresponds to the first sidewall 112, and the second covering area 122 corresponds to the second sidewall 113. A cutout area 1201 is provided on at least one of the first covering area 121 and the second covering area 122. For example, only the first covering area 121 is provided with a cutout area 1201 (i.e., the first cutout area 12011 below); or only the second covering area 122 is provided with a cutout area 1201 (i.e., the second cutout area 12012 below); or both the first covering area 121 and the second covering area 122 are provided with cutout areas 1201.

[0075] Therefore, the insulating film 120 can be composed of a first covering area 121 and a second covering area 122, with the first covering area 121 correspondingly covering and bonding to the first sidewall 112 of the housing 111, and the second covering area 122 correspondingly covering and bonding to the second sidewall 113 of the housing 111.

[0076] Specifically, the first covering area 121 can completely cover the first sidewall 112, or it can only cover part of the first sidewall 112. That is, a hollow area 1201 can be provided on the first covering area 121 so that the coating 130 can be applied to the first sidewall 112 corresponding to the hollow area 1201. Similarly, the second covering area 122 can completely cover the second sidewall 113, or it can only cover part of the second sidewall 113. That is, a hollow area 1201 can also be provided on the second covering area 122 so that the coating 130 can be applied to the second sidewall 113 corresponding to the hollow area 1201.

[0077] Furthermore, refer to Figure 5 , Figure 8 and Figure 13 As shown, the first covering area 121 has a first hollow area 12011. The surface of the housing 111 (i.e., the first sidewall 112) includes a first window area 310, which protrudes from the first hollow area 12011. The coating 130 includes a first coating 131 applied to the first window area 310. The support plate 200 includes a first side plate 210, which can be a base plate, such as a liquid cooling plate, disposed at the bottom of the battery assembly 100. The first side plate 210 is in contact with the first coating 131, meaning that the first side plate 210 and the first coating 131 can be directly bonded together, or they can be indirectly bonded through an intermediate structure.

[0078] A first hollow area 12011 can be formed on the first covering area 121 covering the first sidewall 112. The exposed part of the shell 111 surface corresponding to the first hollow area 12011 is the first window area 310. A first coating 131 can be applied to the shell 111 surface corresponding to the first window area 310 by spraying. During battery assembly, the battery 110 can be connected to the first side plate 210 through the first coating 131, which not only satisfies the insulation effect of the battery 110, but also further improves the bonding strength between the shell 111 surface and the first side plate 210.

[0079] Furthermore, it should be noted that the surface of the housing 111 of the first window area 310 exposed from the first hollow area 12011 can directly contact the first side plate 210 through the first coating 131, or an intermediate structure can be set between the first coating 131 and the first side plate 210 to enhance the bonding strength and prevent detachment. For example, the intermediate structure can be an adhesive layer. As long as the surface of the housing 111 of the first window area 310 and the first side plate 210 are not in direct contact, but the first coating 131 is set between them to enhance the connection strength and improve the stability of the battery pack 1000, it is acceptable.

[0080] Furthermore, combined Figure 13 As shown, the second covering area 122 has a second hollow area 12012, the surface of the housing 111 (i.e. the second sidewall 113) includes a second window area 320, the second window area 320 is exposed from the second hollow area 12012, and the coating 130 includes a second coating 132 coated on the second window area 320.

[0081] The support plate 200 includes a second side plate 220, which is disposed on the side of the battery 110, and there is a pressure resistance between the second side plate 220 and the second coating 132. Optionally, the second side plate 220 may be an end plate disposed at one end of a battery module formed by multiple battery components 100, with the end plate facing the side of the housing 111 of a single battery 110; or, the second side plate 220 may be a side plate disposed on one side of the battery module, in which case the side plate faces the end face of the housing 111 of a single battery 110. In some other possible embodiments, the second side plate 220 may be an integral structure with the housing 500, in which case the side beam or intermediate beam of the housing 500 constitutes the second side plate 220.

[0082] Reference Figure 6 and Figure 9 and Figure 13As shown, similarly, a second hollow area 12012 can be formed on the second covering area 122 covering the second sidewall 113. The exposed portion of the housing 111 surface corresponding to the second hollow area 12012 is the second window area 320, and the housing 111 surface corresponding to the second window area 320 is coated with a second coating 132. During battery assembly, the battery 110 can be connected to the second side plate 220 through the second coating 132, which not only satisfies the insulation effect of the battery 110, but also further improves the bonding strength between the surface of the housing 111 and the second side plate 220.

[0083] Similarly, the surface of the housing 111 of the second window area 320 exposed from the second hollow area 12012 can directly contact the second side plate 220 through the second coating 132, or an intermediate structure can be set between the second coating 132 and the second side plate 220, without restriction.

[0084] Among them, reference Figure 18 and Figure 19 In one possible implementation, along the width direction of the battery 110 (i.e., the third direction, or the Y direction), the thickness of the coating 130 decreases from the edge to the center. For example, the thickness of the coating 130 can gradually decrease from the edge to the center, such as... Figure 18 As shown; or, the thickness of coating 130 decreases gradually from the edge to the center, as shown. Figure 19 As shown.

[0085] It is understandable that the edge of the connection area between the coating 130 and the support plate 200 is a stress concentration area and is prone to peeling of the coating 130. Therefore, in this embodiment, the edge of the coating 130 can be thickened to disperse the peeling force and avoid deformation of the bonding edge to create gaps. In this way, when the battery 110 is assembled with the bonding support plate 200, the edge of the support plate 200 can be effectively prevented from warping, and the sealing and bonding strength can be enhanced.

[0086] Of course, while ensuring the bonding effect, the amount of material used in coating 130 can be reduced. Thus, the thickness of coating 130 can be gradually reduced from the edge to the center, saving material.

[0087] Optionally, the thickness of the edge of coating 130 can range from 20μm to 80μm. For example, the thickness of the edge of coating 130 can be 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, or 80μm. Of course, this application does not limit this, and the thickness of the edge of coating 130 can be flexibly selected within the above range according to actual needs. In this way, it can be ensured that the edge of coating 130 has sufficient shear strength.

[0088] Optionally, the thickness of the central region of the coating 130 along the width direction of the battery 110 can range from 5μm to 20μm. For example, the thickness of the central region of the coating 130 can be 5μm, 8μm, 10μm, 15μm, 18μm, or 20μm. Of course, this application does not limit this, and the thickness of the central region of the coating 130 can be flexibly selected within the above range according to actual needs. In this way, a suitable height difference can be ensured between the edge and the center of the coating 130. Thus, a matching protrusion can be provided on the support plate 200 to be embedded in this region, thereby giving the support plate 200 and the coating 130 sufficient contact area to enhance connection stability.

[0089] In one possible implementation, such as Figure 21 As shown, along the width direction of the battery 110, the coating 130 has a consistent thickness from the edge to the center, and the thickness D1 of the coating 130 and the thickness D2 of the insulating film 120 satisfy: D1 < D2.

[0090] Optionally, the thickness of the coating 130 is less than the thickness of the insulating film 120 so that stress concentration occurs in the area of ​​the coating 130 when it is bonded to the support plate 200, thus ensuring the bonding effect.

[0091] In one possible implementation, combining Figure 10 and Figure 11 As shown, the support plate 200 has a raised structure 201 and a recessed structure 202 on its side surface facing the battery assembly 100. The raised structure 201 and the recessed structure 202 are arranged adjacent to each other, and there is at least one raised structure 201 and a recessed structure 202. Accordingly, the coating 130 of this application can be designed to conform to the structure of the support plate 200. Specifically, the coating 130 includes a recessed region 133 and a raised region 134 opposite to the raised structure 201, wherein the recessed region 133 is opposite to and connected to the raised structure 201, and the raised region 134 is opposite to and connected to the recessed structure 202.

[0092] Therefore, to ensure a tight bond between the coating 130 and the support plate 200 and to prevent gaps or detachment, the coating 130 has a recessed area 133 at a position corresponding to the protruding structure 201 and a protruding area 134 at a position corresponding to the recessed structure 202. The protruding structure 201 on the support plate 200 can be matched and connected with the recessed area 133 on the coating 130, and the recessed structure 202 on the support plate 200 can be matched and connected with the protruding area 134 on the coating 130. This allows the support plate 200 and the coating 130 to be matched and connected. Furthermore, by providing the coating 130 with the recessed area 133 and the protruding area 134, the contact area between the coating 130 and the support plate 200 can be increased, thereby effectively enhancing the shear strength.

[0093] Furthermore, refer to Figures 7-11 As shown, the protruding structure 201 and the recessed structure 202 are staggered along the width direction of the battery assembly 100; correspondingly, the recessed region 133 and the protruding region 134 are staggered along the width direction of the battery assembly 100.

[0094] like Figure 11 As shown, the protruding structures 201 and the recessed structures 202 on the support plate 200 are staggered along the width direction of the battery assembly 100. Similarly, the recessed areas 133 and the protruding areas 134 on the coating 130 are also staggered along the width direction of the battery assembly 100, so that the protruding structures 201 and the recessed areas 133 are connected accordingly, the recessed structures 202 and the protruding areas 134 are connected accordingly, and adjacent positions can be interlocked to improve the bonding strength.

[0095] In addition, it should be noted that the protruding structure 201, the recessed structure 202, the recessed area 133 and the protruding area 134 can also be arranged alternately along the length of the battery assembly 100, as long as they can be arranged alternately and connected accordingly.

[0096] Optionally, the thickness of the raised region 134 can be 20μm-80μm, and the thickness of the recessed region 133 can be 5μm-20μm. For example, the thickness of the raised region 134 can be 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, or 80μm, and the thickness of the recessed region 133 can be 5μm, 8μm, 10μm, 15μm, 18μm, or 20μm. Of course, this application does not limit this, and the thicknesses of the raised region 134 and the recessed region 133 can be flexibly selected within the above range according to actual needs. This helps to ensure that the coating 130 itself has sufficient strength and that the coating 130 and the battery 110 casing 111 have sufficient connection strength, thereby better connecting with the support plate 200 and enhancing the connection stability between the coating 130 and the support plate 200.

[0097] In one possible implementation, combining Figures 12-16 As shown, the support plate 200 has a raised structure 201 on one side surface facing the battery assembly 100, and the coating 130 includes a raised region 134 opposite to the raised structure 201. The raised region 134 is opposite to and connected to the raised structure 201.

[0098] Specifically, the surface of the support plate 200 facing the battery assembly 100 can be configured as follows: Figure 7The raised structure 201 shown has a coating 130 applied to the corresponding window area 300, which is set as a raised area 134 corresponding to the shape of the raised structure 201. Multiple raised areas 134 together constitute the coating 130, so that the raised surface of the raised area 134 can correspond to the raised surface of the raised structure 201 on the support plate 200, so that the raised surfaces of the two can bond to each other and ensure the bonding effect.

[0099] Furthermore, such as Figure 16 As shown, a cooling channel 230 is provided on the inner side of the support plate 200, and the cooling channel 230 is located on the inner side of the protruding structure 201.

[0100] Specifically, in combination Figure 8 As shown, the support plate 200 can be a liquid cooling plate, and a cooling channel 230 is provided inside the support plate 200. Of course, there is a protruding structure 201 on the side surface of the support plate 200 facing the battery assembly 100. The cooling channel 230 is arranged opposite to the protruding structure 201, that is, the cooling channel 230 can be set inside the protruding structure 201 of the support plate 200. The protruding structure 201 is connected to the protruding area 134 of the coating 130. While ensuring that the support plate 200 and the coating 130 can be connected, the coolant can be transferred to dissipate heat from the battery 110.

[0101] refer to Figure 19 In one possible implementation, the battery pack 1000 may also include an adhesive layer 400, through which the support plate 200 and the coating 130 are connected.

[0102] Understandably, to enhance bonding strength and prevent the support plate 200 from detaching from the battery 110 during operation, an adhesive layer 400 can be provided on the contact side between the coating 130 and the support plate 200. The adhesive layer 400 can be a structural adhesive; there are no specific limitations, as long as it effectively prevents the support plate 200 from detaching.

[0103] Optionally, the preparation method of coating 130 in this embodiment is as follows:

[0104] Spraying: UV-cured material is sprayed at a window area of ​​300 mm using a precision spray nozzle according to a set area (S) and shape;

[0105] Curing: Ultraviolet light irradiation (UV wavelength 365-405nm, energy 2000-6000mJ / cm²) 2 The coating 130 is cured, and after curing, micron-level protrusions are formed on the surface of the coating 130, resulting in a surface roughness Ra of 0.5μm-2.5μm.

[0106] Table 1: Comparison of battery packs with coating 130 in this application and those without coating in existing technologies.

[0107] Coating area S 30％-100％ 0％ 100％ Shear strength / MPa 10.5±0.5 5.2±0.5 8.0±0.5 Assembly efficiency (pcs / h) 800 300 600 Failure rate 0.8％ 5.5％ 2.1％

[0108] As can be seen from the table above, by providing a coating 130 in the window area 300 of the housing 111 of the battery 110, this application can effectively improve the problem of insufficient shear strength between the surface of the battery 110 and module structural components such as the support plate 200, thereby improving the stability and reliability of the battery pack 1000.

[0109] refer to Figure 22 Secondly, this application provides an electrical device 2000, including the battery pack 1000 of the above embodiments, wherein the electrical device 2000 can be a new energy vehicle, energy storage cabinet, communication base station, etc.

[0110] The battery pack 1000 has been described in detail in the above embodiments and will not be repeated here.

[0111] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0112] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0113] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0114] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack (1000), characterized in that, include: The housing (500) has a receiving cavity (501); A battery assembly (100) disposed within the receiving cavity (501), the battery assembly (100) comprising: A battery (110), the battery (110) including a housing (111); An insulating film (120) covers the outer surface of the housing (111), and a hollow area (1201) is formed on the insulating film (120). The outer surface of the housing (111) includes a window area (300) exposed from the hollow area (1201). A coating (130) is applied to the window area (300); A support plate (200) is disposed within the receiving cavity (501) and located on the side of the housing (111) coated with the coating (130), and at least a portion of the support plate (200) is connected to the coating (130).

2. The battery pack (1000) according to claim 1, characterized in that, The battery (110) has a height direction (Z), and the housing (111) includes a first sidewall (112) perpendicular to the height direction (Z) and a second sidewall (113) disposed on at least one side of the first sidewall (112) in the circumferential direction; The insulating film (120) includes a first covering region (121) corresponding to the first sidewall (112) and a second covering region (122) corresponding to the second sidewall (113). The hollow area (1201) is provided on at least one of the first covering area (121) and the second covering area (122).

3. The battery pack (1000) according to claim 2, characterized in that, The first covering area (121) has a first hollow area (12011), and the surface of the shell (111) includes a first window area (310) exposed from the first hollow area (12011). The coating (130) includes a first coating (131) applied to the first window area (310); The support plate (200) includes a first side plate (210), a portion of which contacts the first coating (131).

4. The battery pack (1000) according to claim 2, characterized in that, The second covering area (122) has a second hollow area (12012), and the surface of the shell (111) includes a second window area (320) exposed from the second hollow area (12012). The coating (130) includes a second coating (132) applied to the second window area (320); The support plate (200) includes a second side plate (220), which is disposed on the side of the battery (110), and a portion of the second side plate (220) is in contact with the second coating (132).

5. The battery pack (1000) according to any one of claims 1-4, characterized in that, The battery (110) has a width direction (Y) perpendicular to the height direction (Z), and the coating (130) has a thickness that decreases from the edge to the center along the width direction (Y).

6. The battery pack (1000) according to any one of claims 1-4, characterized in that, The battery (110) has a width direction (Y) perpendicular to the height direction (Z). Along the width direction (Y), the coating (130) has a uniform thickness from the edge to the center, and the thickness D1 of the coating (130) and the thickness D2 of the insulating film (120) satisfy: D1 < D2.

7. The battery pack (1000) according to any one of claims 1-4, characterized in that, The support plate (200) has a raised structure (201) and a recessed structure (202) on one side surface facing the battery assembly (100), and the raised structure (201) and the recessed structure (202) are arranged adjacent to each other; The coating (130) includes a recessed region (133) and a raised region (134), wherein the recessed region (133) is opposite to and connected to the raised structure (201), and the raised region (134) is opposite to and connected to the recessed structure (202).

8. The battery pack (1000) according to claim 7, characterized in that, The battery (110) has a width direction (Y) perpendicular to the height direction (Z), and the protruding structure (201) and the recessed structure (202) are staggered along the width direction (Y); the recessed region (133) and the protruding region (134) are staggered along the width direction (Y).

9. The battery pack (1000) according to any one of claims 1-4, characterized in that, The support plate (200) has a raised structure (201) on the side surface facing the battery assembly (100). The coating (130) includes a raised region (134) opposite to and connected to the raised structure (201).

10. The battery pack (1000) according to claim 9, characterized in that, The inner side of the support plate (200) is provided with a cooling channel (230), which is arranged opposite to the protruding structure (201).

11. The battery pack (1000) according to any one of claims 1-4, characterized in that, Also includes: An adhesive layer (400) is provided, through which the support plate (200) and the coating (130) are connected.

12. An electrical appliance (2000), characterized in that, Includes the battery pack (1000) according to any one of claims 1-11.

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