Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment. The battery pack comprises a frame, a plurality of battery cells and a bonding layer, the frame is provided with an accommodating cavity, the plurality of battery cells are arranged in the accommodating cavity, and the adhesive layer is filled in the accommodating cavity and at least partially covers the battery cells; the battery cell comprises a battery cell main body and an insulating layer arranged on the peripheral surface of the battery cell main body, and a lug boss is arranged on one side, deviating from the battery cell main body, of the insulating layer and is embedded into the bonding layer. Thus, through the arrangement of the lug bosses, the area between the bonding layer and the insulating layer is increased, and the bonding force between the bonding layer and the insulating layer is improved, so that the bonding force between the battery cell and the frame is improved, and the vibration and impact requirements in the normal use process of the battery pack are met.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] Currently, with the rapid development of new energy technologies, the demand for battery packs is increasing. A battery pack consists of cell modules and a frame; the frame supports the cell modules and protects them.

[0003] In related technologies, a battery cell module includes multiple battery cells, each comprising a cell housing and electrode cores. To protect the cell housing, an outer coating is typically applied to its surface. When encapsulating a battery with an outer coating, structural adhesive is used between the cell housing and the frame to connect and secure them. However, the bond strength between the structural adhesive and the outer coating is insufficient to meet the vibration and impact requirements during normal battery pack operation. Utility Model Content

[0004] This application aims to provide a battery pack and electrical device that can solve the problem that the battery pack cannot meet the vibration and impact requirements due to insufficient connection strength between the adhesive layer and the outer film.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a battery pack, comprising: a frame, a plurality of battery cells, and an adhesive layer; the frame has a receiving cavity, the plurality of battery cells are disposed within the receiving cavity, and the adhesive layer fills the receiving cavity and at least partially covers the battery cells; each battery cell includes a battery cell body and an insulating layer disposed on the outer peripheral surface of the battery cell body, the insulating layer having a protrusion on the side opposite to the battery cell body, the protrusion being embedded in the adhesive layer.

[0007] Optionally, the insulating layer includes a body portion and a protrusion portion; the body portion covers the outer surface of the battery cell body, and the protrusion portion is disposed on the side surface of the body portion opposite to the battery cell body, wherein the protrusion portion and the body portion are integrally formed; or, the body portion and the protrusion portion are separate structures.

[0008] Optionally, the surface of the body portion facing away from the battery cell body is further provided with a groove; the adhesive layer at least partially fills the groove.

[0009] Optionally, the battery cell body has multiple sides, the insulating layer covers the multiple sides respectively, and the insulating layer on at least some of the sides is provided with the protrusion; the side corresponding to the side with the protrusion is designated as a preset side, and along the direction perpendicular to the preset side, the thickness of the adhesive layer is H1μm, the thickness of the body is H2μm, and the thickness of the protrusion is H3μm, satisfying: 0.05≤(H2-H3) / (H1-H2)≤0.15.

[0010] Optionally, the thickness H2μm of the body portion satisfies: 70≤H2≤150; and / or, the thickness H3μm of the protrusion portion satisfies: 10≤H3≤30.

[0011] Optionally, the battery pack has a first direction and a second direction that are perpendicular to each other, and a plurality of protrusions are spaced apart on the preset side along the first direction, the protrusions including a plurality of protrusions spaced apart along the second direction.

[0012] Optionally, the projections of two adjacent rows of protrusions onto a plane perpendicular to the first direction are at least partially staggered; or, the projections of two adjacent rows of protrusions onto a plane perpendicular to the first direction completely overlap.

[0013] Optionally, the distance between two adjacent protrusions in the same row of protrusions is L1mm, satisfying: 5≤L1≤20.

[0014] Optionally, the protrusion has a dimension of L2 mm along the second direction, satisfying: 5≤L2≤20; and / or, the protrusion has a dimension of L3 mm along the first direction, satisfying: 3≤L3≤10.

[0015] Optionally, the preset side surface is provided with a plurality of protrusions, and the orthographic projection area of ​​the plurality of protrusions on the preset side surface is S1 mm. 2 The area of ​​the preset side surface is S² mm. 2 The condition is satisfied that 0.3≤S1 / S2≤0.7.

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

[0017] In the embodiments of this application, multiple battery cells are disposed within a receiving cavity, and an adhesive layer fills the receiving cavity and at least partially covers the battery cells. Each battery cell includes a cell body and an insulating layer disposed on the outer peripheral surface of the cell body. A protrusion is provided on the side of the insulating layer facing away from the cell body, and the protrusion is embedded in the adhesive layer. Thus, by providing the protrusion, the area between the adhesive layer and the insulating layer is increased, improving the bonding force between the adhesive layer and the insulating layer, thereby enhancing the bonding force between the battery cell and the frame, and meeting the vibration and impact requirements during normal use of the battery pack. Attached Figure Description

[0018] Figure 1 This is an exploded view of a battery pack according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0020] Figure 3 This is a partial cross-sectional view of a battery pack according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of a first structure of the insulating layer according to an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of a second structure of the insulating layer according to an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of a third structure of the insulating layer according to an embodiment of this application;

[0024] Figure 7 This is a schematic diagram of a first arrangement structure of the protrusions according to an embodiment of this application;

[0025] Figure 8 This is a schematic diagram of a second arrangement structure of the protrusions according to an embodiment of this application;

[0026] Figure 9 This is a schematic diagram of a third arrangement structure of the protrusions according to an embodiment of this application.

[0027] Figure label:

[0028] 1-Frame; 11-Liquid cooling plate; 12-Frame body; 13-Top cover; 2-Battery cell; 21-Battery cell body; 22-Insulation layer; 221-Body part; 222-Protrusion; 223-Groove; 23-Protrusion row; 3-Adhesive layer; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0029] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The battery pack and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0034] Optionally, such as Figures 1-3As shown in the embodiment of this application, a battery pack is proposed, including: a frame 1, a plurality of battery cells 2 and an adhesive layer 3; the frame 1 has a receiving cavity, the plurality of battery cells 2 are disposed in the receiving cavity, and the adhesive layer 3 fills the receiving cavity and at least partially covers the battery cells 2; the battery cell 2 includes a battery cell body 21 and an insulating layer 22 disposed on the outer peripheral surface of the battery cell body 21, and the insulating layer 22 has a protrusion 222 on the side away from the battery cell body 21, and the protrusion 222 is embedded in the adhesive layer 3.

[0035] In the embodiments of this application, multiple battery cells 2 are disposed within a receiving cavity, and an adhesive layer 3 fills the receiving cavity and at least partially covers the battery cells 2. Each battery cell 2 includes a battery cell body 21 and an insulating layer 22 disposed on the outer peripheral surface of the battery cell body 21. A protrusion 222 is provided on the side of the insulating layer 22 facing away from the battery cell body 21, and the protrusion 222 is embedded in the adhesive layer 3. Thus, by providing the protrusion 222, the area between the adhesive layer 3 and the insulating layer 22 is increased, improving the bonding force between the adhesive layer 3 and the insulating layer 22, thereby improving the bonding force between the battery cell 2 and the frame 1, and meeting the vibration and impact requirements during normal use of the battery pack.

[0036] It should be noted that the adhesive layer 3 can fill the gap between the two battery cells 2, as well as the gap between the battery cell 2 and the frame 1.

[0037] Specifically, such as Figure 3 As shown, the contact area between the upper surface of the protrusion 222 and the adhesive layer 3, plus the contact area between the body portion 221 and the adhesive layer 3, is equal to the sum of the contact areas between the insulating layer 22 with the protrusion 222 and the adhesive layer 3. The contact area between the side of the protrusion 222 and the adhesive layer 3 is the extra contact area, thereby increasing the contact area between the insulating layer 22 and the adhesive layer 3 by utilizing the extra contact area.

[0038] In some embodiments, the battery cell 2 further includes an electrode core, an explosion-proof valve, a terminal post, and a battery cell housing. The electrode core is formed by winding / stacking positive and negative electrode sheets and a diaphragm. The electrode core is disposed in the battery cell housing. The terminal post is electrically connected to the electrode core and extends out of the battery cell housing. The explosion-proof valve is disposed on the surface of the battery cell housing. The outer peripheral surface of the battery cell body 21 refers to the outer surface of the battery cell housing. The insulating layer 22 is uniformly coated on the six surfaces of the battery cell housing, excluding the terminal post, the explosion-proof valve, and the QR code functional area of ​​the battery cell 2.

[0039] In the prior art, to prevent scratches or short circuits on the surface of the battery body, an insulating layer 22 is typically provided on the surface of the cell casing 2. During battery assembly with the insulating layer 22, structural adhesive is applied between the frame 1 and the insulating layer 22. Due to material limitations, the shear strength between traditional outer films such as PET and the structural adhesive is typically less than 2 MPa, which cannot meet the requirements of a battery pack. Therefore, this application provides a battery with protrusions on the surface of the insulating layer 22, which can significantly improve the shear strength between the insulating layer 22 and the structural adhesive.

[0040] In some embodiments, before coating the insulating layer 22, the surface of the battery cell housing is cleaned, and then ultraviolet (UV) ink is uniformly sprayed onto the surface of the battery cell housing through a printhead. Finally, ultraviolet light is used to cure the UV ink to form the insulating layer 22.

[0041] Specifically, UV ink comprises a base resin, monomers, photoinitiators, and various additives. The base resin includes 10-15 parts of isophorone diisocyanate, polyether polyol synthetic polyurethane acrylate, and modified phenolic resin; the monomers include 20-50 parts of isobornyl acrylate, benzyl acrylate, and dicyclopentadiene acrylate; the photoinitiators include 1-10 parts of 2,4,6-trimethylbenzoyl-xylphosphine oxide and 2-isopropylthioxanthraquinone; and the additives include 5-10 parts of phosphate acrylate and cross-linked polyvinylpyrrolidone.

[0042] In some embodiments, the viscosity of the UV ink is 10-100 cps. The UV ink is uniformly coated onto the surface of the battery cell body 21 through a printhead and cross-linked and cured under UV light of a specific wavelength. The UV ink spraying and curing method, which employs a pre-spraying and pre-curing process, can prevent the coating from sagging and ensure the thickness and shape of the coating.

[0043] In some embodiments, such as Figure 1 As shown, the frame 1 includes a liquid cooling plate 11, a frame body 12, and a top cover 13. The liquid cooling plate 11 and the top cover 13 are located on the upper and lower sides of the frame body 12. The top cover 13 and the liquid cooling plate 11 are laser-welded to the frame body 12 to form a receiving cavity. Multiple battery cells 2 are stacked on the liquid cooling plate 11. Thermally conductive structural adhesive can be provided between the bottom surface of each battery cell 2 and the liquid cooling plate 11 for heat dissipation and cooling during the use of the battery cell 2, while ensuring the connection strength between the battery cell 2 and the liquid cooling plate 11.

[0044] Optionally, such as Figure 3 As shown, the insulating layer 22 includes a body portion 221 and a protrusion portion 222; the body portion 221 covers the outer surface of the cell body 21, and the protrusion portion 222 is provided on the side surface of the body portion 221 away from the cell body 21, wherein the protrusion portion 222 and the body portion 221 are integrally formed.

[0045] In this embodiment, the body portion 221 covers the outer surface of the cell body 21, and the protrusion is a protrusion 222 provided on the side surface of the body portion 221 opposite to the cell body 21, wherein the protrusion 222 and the body portion 221 are integrally formed. This integral forming arrangement helps to improve the bonding force between the protrusion 222 and the body portion 221. Furthermore, the protrusion 222 can extend from the side surface of the body portion 221 opposite to the cell body 21 in a direction away from the cell body 21.

[0046] In some embodiments, the adhesive layer 3 is formed by curing structural adhesive. The assembly process of the battery cell 2 includes: applying structural adhesive between the frame 1 and the battery cell 2, covering the protrusion 222 under assembly pressure, and fixing the frame 1 and the battery cell 2 by intermolecular adsorption forces after curing. The presence of the protrusion 222 increases the contact area between the adhesive layer 3 and the insulating layer 22 and generates adsorption forces in different directions, effectively improving the bonding force between the insulating layer 22 and the adhesive layer 3.

[0047] Optionally, such as Figure 4 As shown, the main body 221 and the protrusion 222 are separate structures.

[0048] In this embodiment, the main body 221 and the protrusion 222 are configured as separate structures. This allows the protrusion 222 and the main body 221 to be processed separately, improving production efficiency.

[0049] Optionally, such as Figure 6 As shown, the surface of the main body 221 facing away from the main body 21 is also provided with a groove 223; the adhesive layer 3 at least partially fills the groove 223.

[0050] In this embodiment, a groove 223 is provided on the surface of the body portion 221 opposite to the battery cell body 21; the adhesive layer 3 is at least partially filled in the groove 223. This allows for a further increase in the contact area between the insulating layer 22 and the adhesive layer 3 by utilizing the groove 223.

[0051] Specifically, the adhesive layer 3 can fill the groove 223. In this way, the bottom surface of the groove 223 is the original contact area between the insulating layer 22 and the adhesive layer 3, and the side surface of the groove 223 is the additional contact area between the adhesive layer 3 and the side surface of the groove 223. This can further improve the bonding force between the adhesive layer 3 and the insulating layer 22.

[0052] Optionally, such as Figure 3As shown, the battery cell body 21 has multiple sides, and the insulating layer 22 covers the multiple sides respectively. At least some of the insulating layers 22 on the sides are provided with protrusions 222. The side with the protrusions 222 is designated as a preset side. Along the direction perpendicular to the preset side, the thickness of the adhesive layer 3 is H1μm, the thickness of the body 221 is H2μm, and the thickness of the protrusion is H3μm, satisfying: 0.05≤(H2-H3) / (H1-H2)≤0.15.

[0053] In this embodiment, the insulating layer 22 covers multiple sides, and at least some sides of the insulating layer 22 have protrusions 222. The sides with the protrusions 222 are designated as preset sides. Along a direction perpendicular to the preset side, the thickness H1 of the adhesive layer 3, the thickness H2 of the body portion 221, and the thickness H3 of the protrusions 222 are arranged to satisfy a certain relationship. This improves the bonding strength between the insulating layer 22 and the adhesive layer 3.

[0054] It should be noted that, as Figure 3 As shown, the direction perpendicular to the preset side is the third direction Z. The thickness of the protrusion 222 refers to the distance along the third direction Z from the side surface of the main body 221 away from the main cell body 21 to the side surface of the protrusion 222 away from the main cell body 21. The thickness of the adhesive layer 3 refers to the distance along the third direction Z from the side surface of the main body 221 away from the main cell body 21 to the side surface of the adhesive layer 3 away from the main body 221.

[0055] For example, the value of (H2-H3) / (H1-H2) can be set to any number of values ​​or a range between any two values, such as 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15.

[0056] In some test cases, battery packs of different specifications were selected for performance testing. Except for the different dimensions of H1, H2, and H3 mentioned above, the structures of the battery packs of different specifications were identical. Shear strength tests were performed on the battery packs of different specifications, and the test results are shown in Table 1 below:

[0057] Table 1

[0058]

[0059] Based on the test results in Table 1, it can be seen from the test data of Test Example 1 and Test Example 2 that if no protrusion is added between the insulating layer 22 and the adhesive layer 3, the shear strength between the insulating layer 22 and the adhesive layer 3 is <9MPa.

[0060] Based on the test results in Table 1, the test data from Test Examples 3 to 5 show that if a protrusion 222 is added between the insulating layer 22 and the adhesive layer 3, the ratio of (H2-H3) / (H1-H2) is less than 0.05. At this time, the shear strength between the insulating layer 22 and the adhesive layer 3 is >10MPa. Although the shear strength between the insulating layer 22 and the adhesive layer 3 is improved compared to not adding the protrusion 222, the improvement is still not significant due to the small ratio of (H2-H3) / (H1-H2), and it cannot meet the shear strength requirements between the insulating layer 22 and the adhesive layer 3.

[0061] Based on the test results in Table 1, the test data from Test Examples 12 to 13 show that if a protrusion 222 is added between the insulating layer 22 and the adhesive layer 3, the ratio of (H2-H3) / (H1-H2) is greater than 0.15. At this time, the shear strength between the insulating layer 22 and the adhesive layer 3 is >10MPa. Although the shear strength between the insulating layer 22 and the adhesive layer 3 is improved compared to not adding the protrusion 222, the improvement is still not significant due to the large ratio, and it cannot meet the shear strength requirements between the insulating layer 22 and the adhesive layer 3.

[0062] Based on the test results in Table 1, the test data from Test Examples 6 to 11 show that if a protrusion 222 is added between the insulating layer 22 and the adhesive layer 3, and the ratio of (H2-H3) / (H1-H2) is between 0.05 and 0.15, the shear strength between the insulating layer 22 and the adhesive layer 3 is between 13 MPa and 16 MPa. The bonding force between the insulating layer 22 and the adhesive layer 3 is significantly improved, enabling the battery pack to withstand vibration and impact under extreme conditions, effectively ensuring the safety and reliability of the battery pack.

[0063] Understandably, tensile testing machines cannot perform shear tests on the battery body and battery pack body itself in battery insulation layer and battery pack structural adhesive shear strength testing. Therefore, the industry typically uses standard-sized aluminum sheets for shear strength testing. The aluminum sheet used for testing is made of the same material as the battery casing and battery pack structural components. By spraying or applying structural adhesive to the surface of the aluminum sheet, the shear strength between the insulation coating and the structural adhesive can be simulated.

[0064] Therefore, the method used for testing the shear strength of each battery pack in this utility model test example is as follows: Prepare standard-sized aluminum sheets, such as 100mm*25mm*1.5mm. After laser cleaning and UV spraying, aluminum sheets are used to obtain sprayed aluminum sheet samples that meet the test example. A certain area (25*12.5mm) and thickness (0.5mm) of structural adhesive is applied to the opposite coating surfaces of the two sprayed aluminum sheets. After curing, a tensile testing machine is used to perform tensile testing to obtain the shear strength.

[0065] Optionally, such as Figure 3 As shown, the thickness H2μm of the body part 221 satisfies: 70≤H2≤150.

[0066] In this embodiment, the thickness H2 of the body portion 221 is set within a certain range. This avoids the problem of increased cost due to an excessively large thickness H2 of the body portion 221, and avoids the problem of insufficient connection strength between the body portion 221 and the adhesive layer 3 due to an excessively small thickness H2.

[0067] For example, the value of H2μm can be set to any value or a range between any two values, such as 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm.

[0068] Optionally, such as Figure 3 As shown, the thickness H3μm of the protrusion 222 satisfies: 10≤H3≤30.

[0069] In this embodiment, the thickness H3 of the protrusion 222 is set within a certain range. This avoids the problem of increased cost due to an excessively large thickness H3 of the protrusion 222, and also avoids the problem of insufficient connection strength between the protrusion 222 and the adhesive layer 3 due to an excessively small thickness H3.

[0070] For example, the value of H3μm can be set to any value such as 10μm, 15μm, 20μm, 25μm, 30μm, or a range between any two values.

[0071] In some embodiments, such as Figure 5 As shown, the thickness between two adjacent protrusions 222 in the same row of protrusions 222 is not equal. The thickness difference between two adjacent protrusions 222 in the same row of protrusions 222 is H4μm, which satisfies: 0≤H4≤30.

[0072] Optionally, the thickness H1μm of the adhesive layer 3 satisfies: 500≤H1≤3000.

[0073] In this embodiment, the thickness H1 μm of the adhesive layer 3 is set within a certain range. This avoids the problem of increased cost due to an excessively large thickness H1 of the adhesive layer 3, and the problem of insufficient connection strength between the adhesive layer 3 and the insulating layer 22 due to an excessively small thickness H1.

[0074] For example, the value of H1μm can be set to any value or a range between any two values, such as 500μm, 1000μm, 1500μm, 2000μm, 2500μm, 3000μm.

[0075] In some embodiments, a plurality of longitudinal beams are provided on the liquid cooling plate 11. The longitudinal beams have a certain height and can improve the structural strength of the liquid cooling plate 11. An adhesive layer 3 can also be provided between the bottom surface of each battery cell 2 and the liquid cooling plate 11. The longitudinal beams can also control the thickness of the adhesive layer 3, avoiding the adhesive layer 3 being too thick, which would increase material costs, or too thin, which would result in insufficient connection strength between the battery cell 2 and the liquid cooling plate 11.

[0076] Specifically, the height of the longitudinal beam can be set between 0.5mm and 3mm to match the thickness H1 of the adhesive layer 3.

[0077] Optionally, such as Figures 7 to 9 As shown, the battery pack has a first direction X and a second direction Y that are perpendicular to each other. A plurality of protrusions 23 are arranged at intervals along the first direction X on a preset side. The protrusions 23 include a plurality of protrusions 222 that are arranged at intervals along the second direction Y.

[0078] In this embodiment, a plurality of raised rows 23 are provided on a preset side surface, spaced apart along a first direction X. Each raised row 23 includes a plurality of raised portions 222 spaced apart along a second direction Y. This increases the bonding area between the insulating layer 22 and the adhesive layer 3 through the plurality of raised rows 23, thereby improving the bonding force between the two.

[0079] It should be noted that, as Figure 2 As shown, when the preset side is the large surface of the battery cell 2, the large surface of the battery cell 2 refers to the surface with the larger area on the outer periphery of the battery cell 2. In this case, the first direction X is the height direction of the battery cell 2, and the second direction Y is the length direction of the battery cell 2. When the preset side is the small surface set between two large surfaces, that is, the surface with the smaller area on the outer periphery of the battery cell 2, the first direction X is the height direction of the battery cell 2, and the second direction Y is the width direction of the battery cell 2. When the preset side is the bottom surface or the top surface, the first direction X is the width direction of the battery cell 2, and the second direction Y is the length direction of the battery cell 2.

[0080] It should be noted that the distance between the multiple raised rows 23 can be the same or different. For example, the distance between two adjacent raised rows 23 can be set between 5mm and 20mm.

[0081] In some embodiments, the shape of the cross-section of the protrusion 222 along the first direction X can be set to at least one of square, rhombus, triangle, circle or hexagon.

[0082] Optionally, such as Figures 8 to 9 As shown, the projections of two adjacent rows of protrusions 23 onto a plane perpendicular to the first direction X are at least partially offset.

[0083] In this embodiment, the projections of adjacent rows of raised sections 23 onto a plane perpendicular to the first direction X are at least partially staggered. This ensures that the bonding forces between adjacent rows of raised sections 23 and the adhesive layer 3 are staggered, thereby resulting in a uniform distribution of the bonding force between the insulating layer 22 and the adhesive layer 3.

[0084] Specifically, Figure 8 The topmost row of protrusions is the first row of protrusions, and the row adjacent to the first row of protrusions is the second row of protrusions; the leftmost first protrusion in the first row of protrusions is the first protrusion; the leftmost first protrusion in the second row of protrusions is the second protrusion; the projections of adjacent rows of protrusions on a plane perpendicular to the first direction X are at least partially offset, meaning that the projections of the first protrusion and the second protrusion on a plane perpendicular to the first direction X are at least partially offset.

[0085] Optionally, such as Figure 7 As shown, the projections of two adjacent rows of protrusions 23 onto a plane perpendicular to the first direction X completely overlap.

[0086] In this embodiment, the projections of two adjacent rows of raised sections 23 onto a plane perpendicular to the first direction X overlap. This ensures the proper placement of the raised sections 222 while facilitating the flow and filling of the adhesive.

[0087] Specifically, Figure 7 The topmost row of protrusions is the first row of protrusions, and the row adjacent to the first row of protrusions is the second row of protrusions; the first protrusion on the far left of the first row of protrusions is the first protrusion; the first protrusion on the far left of the second row of protrusions is the second protrusion; the projections of two adjacent rows of protrusions 23 onto a plane perpendicular to the first direction X completely overlap, meaning that the projections of the first protrusion and the second protrusion onto a plane perpendicular to the first direction X completely overlap.

[0088] Optionally, such as Figure 7 As shown, the distance between two adjacent protrusions 222 in the same row of protrusions 23 is L1 mm, which satisfies: 5≤L1≤20.

[0089] In this embodiment, the spacing L1 between two adjacent protrusions 222 in the same row of protrusions 23 is set within a certain range. This avoids the situation where the spacing L1 between two adjacent protrusions 222 in the same row of protrusions 23 is too small, resulting in an excessive number of protrusions 222 and thus material waste, and also avoids the situation where the spacing L1 between two adjacent protrusions 222 in the same row of protrusions 23 is too large, resulting in an insufficient number of protrusions 222 and thus insufficient bonding force between the insulating layer 22 and the adhesive layer 3.

[0090] For example, the value of L1 mm can be set to any value such as 5mm, 8mm, 11mm, 14mm, 17mm, 20mm, or a range between any two values.

[0091] Optionally, such as Figure 7 As shown, the size of the protrusion 222 along the second direction Y is L2 mm, which satisfies: 5≤L2≤20.

[0092] In this embodiment, the dimension L2 of the protrusion 222 along the second direction Y is set within a certain range. This avoids the situation where the dimension L2 of the protrusion 222 along the second direction Y is too small, resulting in an insufficient contact area with the adhesive layer 3, and also avoids the situation where the dimension L2 of the protrusion 222 along the second direction Y is too large, resulting in increased costs.

[0093] For example, the L2 mm can be set to any value such as 5mm, 8mm, 11mm, 14mm, 17mm, 20mm or any range between two values.

[0094] Optionally, such as Figure 7 As shown, the size of the protrusion 222 along the first direction X is L3 mm, which satisfies: ≤L3≤10.

[0095] In this embodiment, the size L3 of the protrusion 222 along the first direction X is set within a certain range. This avoids the protrusion 222 being too small, resulting in an insufficient contact area with the adhesive layer 3, and also avoids the protrusion 222 being too large, resulting in increased costs.

[0096] For example, L3 mm can be set to any value or a range between any two values, such as 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

[0097] Optionally, such as Figure 7 As shown, a plurality of protrusions 222 are provided on the preset side, and the orthographic projection area of ​​the plurality of protrusions 222 on the preset side is S1 mm. 2 The area of ​​the preset side surface is S2 mm. 2 The condition is satisfied that 0.3≤S1 / S2≤0.7.

[0098] It should be noted that, as Figure 7 As shown, the area of ​​the orthographic projection of the plurality of protrusions 222 on the preset side refers to the sum of the orthographic projection areas of all the protrusions 222 provided on the preset side.

[0099] In this embodiment, the ratio between the projected area S1 of the plurality of protrusions 222 on a preset side surface and the area S2 of the preset side surface is set within a certain range. This avoids an excessively large S1 / S2 ratio, which would result in an excessively large projected area of ​​the protrusions 222 and thus increase material usage costs, and also avoids an excessively small S1 / S2 ratio, which would result in an excessively small projected area of ​​the protrusions 222 and thus an excessively small contact area between the protrusions 222 and the adhesive layer 3.

[0100] For example, the ratio between S1 and S2 can be set to any value such as 0.3, 0.4, 0.5, 0.6, 0.7, 0.85, or any range between any two values.

[0101] Table 2

[0102]

[0103] It should be noted that the method used for the shear strength test of each battery pack in the test examples is as follows: Prepare standard-sized aluminum sheets, such as 100mm*25mm*1.5mm. After laser cleaning and UV spraying, the aluminum sheets are coated to obtain coated aluminum sheets. A certain area (25*12.5mm) and thickness (0.5mm) of structural adhesive is applied to the coating surfaces of two coated aluminum sheets. After curing, a tensile testing machine is used to conduct a tensile test to obtain the shear strength. Based on the material usage of the sample without protrusions, the coating thickness, coating density, and coating area of ​​the sample with protrusions can be used to calculate the ratio of coating material usage to the increase in material usage.

[0104] Secondly, embodiments of this application provide an electrical device including the battery pack described in the above embodiments.

[0105] In the embodiments of this application, multiple battery cells 2 are disposed within a receiving cavity, and an adhesive layer 3 fills the receiving cavity and at least partially covers the battery cells 2. Each battery cell 2 includes a battery cell body 21 and an insulating layer 22 disposed on the outer peripheral surface of the battery cell body 21. A protrusion 222 is provided on the side of the insulating layer 22 facing away from the battery cell body 21, and the protrusion 222 is embedded in the adhesive layer 3. Thus, by providing the protrusion 222, the area between the adhesive layer 3 and the insulating layer 22 is increased, improving the bonding force between the adhesive layer 3 and the insulating layer 22, thereby improving the bonding force between the battery cell 2 and the frame 1, and meeting the vibration and impact requirements during normal use of the battery pack.

[0106] It should be noted that the electrical equipment in this application embodiment may include, but is not limited to, vehicles, energy storage devices, aircraft, ships, mobile terminals, and household appliances. Of course, the electrical equipment may also be other devices, and this application embodiment does not limit this.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0108] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises a frame (1), a plurality of battery cells (2) and an adhesive layer (3). The frame (1) has a receiving cavity, the plurality of battery cells (2) are arranged in the receiving cavity, and the adhesive layer (3) is filled in the receiving cavity and at least partially covers the battery cells (2). The battery cell (2) comprises a battery cell body (21) and an insulation layer (22) arranged on the outer circumferential surface of the battery cell body (21), and a protruding portion (222) is arranged on the side of the insulation layer (22) away from the battery cell body (21), and the protruding portion (222) is embedded in the adhesive layer (3). The insulation layer (22) comprises a body portion (221) covering the outer surface of the battery cell body (21), and the protruding portion (222) is arranged on the side surface of the body portion (221) away from the battery cell body (21); wherein, 2. The battery pack of claim 1, wherein, The protruding portion (222) and the body portion (221) are integrally formed; Or, the protruding portion (222) and the body portion (221) are in a split structure. The side surface of the body portion (221) away from the battery cell body (21) is further provided with a groove (223), and the adhesive layer (3) is at least partially filled in the groove (223).

3. The battery pack of claim 2, wherein, The battery cell body (21) has a plurality of side surfaces, the insulation layer (22) covers a plurality of the side surfaces respectively, and the insulation layer (22) on at least part of the side surfaces is provided with the protruding portion (222); 4. The battery pack of claim 2, wherein, The side surface corresponding to the protruding portion (222) is a preset side surface, along the direction perpendicular to the preset side surface, the thickness of the adhesive layer (3) is H1 μm, the thickness of the body portion (221) is H2 μm, and the thickness of the protruding portion (222) is H3 μm, and the following conditions are met: 0.05≤(H2-H3) / (H1-H2)≤0.

15. The thickness H2 μm of the body portion (221) satisfies: 70≤H2≤150; and / or, the thickness H3 μm of the protruding portion (222) satisfies: 10≤H2≤30.

5. The battery pack of claim 4, wherein, The battery pack has a first direction (X) and a second direction (Y) perpendicular to each other, the preset side surface is provided with a plurality of protruding rows (23) arranged at intervals along the first direction (X), and the protruding row (23) comprises a plurality of protruding portions (222) arranged at intervals along the second direction (Y).

6. The battery pack of claim 4, wherein, The projections of the two adjacent protruding rows (23) on the plane perpendicular to the first direction (X) are at least partially staggered; or, the projections of the two adjacent protruding rows (23) on the plane perpendicular to the first direction (X) are completely overlapped.

7. The battery pack of claim 6, wherein, The distance between the two adjacent protruding portions (222) in the same protruding row (23) is L1 mm, and the following condition is met: 5≤L1≤20.

8. The battery pack of claim 7, wherein, The size of the protruding portion (222) along the second direction (Y) is L2 mm, and the following condition is met: 5≤L2≤20; and / or, the size of the protruding portion (222) along the first direction (X) is L3 mm, and the following condition is met: 3≤L3≤10.

9. The battery pack of claim 7, wherein, The battery pack comprises the battery pack according to any one of claims 1-10.

10. The battery pack of any one of claims 6-9, wherein, The preset side surface is provided with a plurality of the protruding portions (222), and the area of the orthographic projection of the plurality of the protruding portions (222) on the preset side surface is S1 mm 2 , the area of the preset side surface is S2 mm 2 , and the following is satisfied: 0.3≤S1 / S2≤0.

7.

11. An electrical device, characterized by ​

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