Bonding assembly, battery and electric device

Abstract

The present application relates to a bonding assembly, a battery and an electric device. The bonding assembly comprises a main body member and a connecting member, wherein the main body member comprises first rubber; and the connecting member is connected to at least one side of the main body member in its own thickness direction, and the connecting member comprises a base material, a connecting layer and a bonding layer, the connecting layer being arranged on the side of the base material facing the main body member, and bonding the base material to the main body member, the connecting layer comprising second rubber, the second rubber and the first rubber being made of the same material or different materials, and the bonding layer being bonded to the side of the base material facing away from the connecting layer. When used in a battery, the bonding assembly can improve the structural stability of the battery.

Description

Bonding components, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311182630.0, filed on September 14, 2023, entitled “Adhesive assembly, battery and electrical device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and more specifically, to an adhesive assembly, a battery, and an electrical device. Background Art

[0004] Batteries have high capacity and long lifespans, making them widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. As batteries have made significant progress, higher performance requirements have been placed on them.

[0005] However, the structural stability of battery cells is still poor.

[0006] Summary of the Invention

[0007] The present application provides an adhesive assembly, a battery, and an electrical device. The structural stability of the battery described in the present application can be improved.

[0008] In the first aspect, an embodiment of the present application proposes a bonding assembly, which includes a main component and a connecting component, the main component includes a first rubber, the connecting component is connected to at least one side of the main component along its own thickness direction, the connecting component includes a substrate, a connecting layer and an adhesive layer, the connecting layer is arranged on the side of the substrate facing the main component, and bonds the substrate and the main component, the connecting layer includes a second rubber, the material of the second rubber is the same or different from that of the first rubber; the adhesive layer is bonded to the side of the substrate away from the connecting layer.

[0009] Therefore, according to the bonding assembly in the embodiment of the present application, it includes a main component and a connecting component. The main component can buffer the volume expansion of the battery cell and improve the structural stability of the battery; the connecting component is connected to the main component and can bond the main component and the battery cell, and the connecting component is connected to the main component through a connecting layer. The material of the connecting layer and the main component are both rubber materials with good material compatibility. The interface bonding force between the connecting layer and the main component is strong, which can improve the connection stability between the connecting layer and the main component and enhance the structural stability of the bonding assembly itself; when the bonding assembly is applied to the battery, the structural stability of the battery can be improved.

[0010] In some embodiments, the connecting layer is bonded to the surface of the main component, and the tensile shear strength of the connecting layer is ≥0.42 MPa; it can be optionally 0.42 MPa to 0.72 MPa.

[0011] Therefore, when the tensile shear strength of the connecting layer in the embodiment of the present application is within the above range, the bonding force between the connecting layer and the main component is strong, and the two are not easily separated, thereby improving the overall structural stability of the bonding assembly.

[0012] In some embodiments, the elastic modulus of the first and second rubbers are independently selected from 0.1 MPa to 20 MPa, optionally 0.1 MPa to 10 MPa, or optionally 0.1 MPa to 5 MPa. During the charge and discharge process, the battery cells may expand in volume, exerting a compressive force on the first rubber. The first rubber can deform to a certain extent under the action of this compressive force, reducing the risk of battery cell collapse and improving the overall structural stability of the battery.

[0013] In some embodiments, the first rubber and the second rubber each independently include at least one of a polyolefin polymer and an organosiloxane polymer; optionally, the first rubber and the second rubber each independently include an organosiloxane polymer; optionally, the polyolefin polymer includes at least one of cis-1,4-polyisoprene, cis-1,4-polybutadiene, polychloroprene, and ethylene propylene diene monomer copolymer; the organosiloxane polymer includes at least one of polydimethylsiloxane, polymethylvinylsiloxane, polymethylphenylvinylsiloxane, and polyfluorosiloxane; optionally, the first rubber and the second rubber each independently include an organosiloxane polymer.

[0014] Therefore, the first rubber and the second rubber in the embodiment of the present application have good compatibility, which is beneficial to improving the structural stability of the bonding assembly itself. The primer process does not need to be used on the surface of the main component, that is, the connecting components can be bonded together, thus not introducing the problem of poor process stability caused by the primer; and because the connecting layer and the main component have good compatibility and strong bonding force, the two are not prone to peeling and separation.

[0015] In some embodiments, the ratio of the thickness of the connecting layer to the thickness of the main member is 1:(29 to 200); optionally, 1:(29 to 167). Alternatively, the thickness of the connecting layer is 15 μm to 35 μm; optionally, the thickness of the main member is 1000 μm to 3000 μm. When the ratio of the thickness of the connecting layer to the thickness of the main member is within the above range, the bonding strength between the connecting layer and the main member can be increased, thereby improving the structural stability of the entire bonded assembly.

[0016] In some embodiments, the adhesive layer is configured to bond to a metal surface, and the tensile shear strength of the adhesive layer is ≥ 1.34 MPa, optionally ranging from 1.34 MPa to 3.0 MPa. When the tensile shear strength of the adhesive layer is within this range, the bonding between the adhesive layer and the metal is strong, making separation less likely, thereby improving the overall structural stability of the adhesive assembly.

[0017] In some embodiments, the adhesive layer is configured to bond to the surface of the organic polymer, and the tensile shear strength of the adhesive layer is ≥ 1.34 MPa, optionally ranging from 1.34 MPa to 3.0 MPa. When the tensile shear strength of the adhesive layer is within this range, the adhesion between the adhesive layer and the organic polymer is strong, and separation between the two is unlikely, thereby improving the overall structural stability of the adhesive assembly.

[0018] In some embodiments, the adhesive layer includes an acrylic polymer; optionally, the acrylic polymer includes at least one of polymethyl methacrylate, polyethyl acrylate, and polybutyl acrylate. This provides for stronger adhesion between the adhesive layer and the battery cell. Furthermore, since direct bonding between the adhesive layer and the main component requires a primer, the present embodiments provide a connecting layer between the adhesive layer and the main component, thereby improving the bonding strength between the main component and the adhesive layer while eliminating the need for a primer.

[0019] In some embodiments, the thickness of the adhesive layer is 15 μm to 25 μm. When the thickness of the adhesive layer is within the above range, the adhesive force between the adhesive layer and the battery cell is relatively strong.

[0020] In some embodiments, the substrate comprises at least one of polyethylene terephthalate, polypropylene, polycarbonate, and polyamide. When the substrate is selected from the above materials, it can play a supporting role.

[0021] In some embodiments, the thickness of the substrate is 5 μm to 15 μm, or optionally 5 μm to 12 μm. When the thickness of the substrate is within the above range, it can provide good support for the adhesive assembly.

[0022] In some embodiments, the connecting member is connected to both sides of the main member along its own thickness direction, which can improve the connection stability between the connecting member and the main member and enhance the structural stability of the adhesive assembly itself; when the adhesive assembly is applied to the battery, the structural stability of the battery can be improved.

[0023] In a second aspect, an embodiment of the present application further proposes a battery, which includes an adhesive assembly and a battery cell as in any embodiment of the first aspect of the present application, wherein the adhesive assembly is connected to the battery cell, and the adhesive layer of the adhesive assembly is bonded to the surface of the battery cell.

[0024] In some embodiments, a plurality of battery cells are provided, and the adhesive assembly is provided between two adjacent battery cells.

[0025] In some embodiments, the battery cell includes two first surfaces opposite to each other and two second surfaces opposite to each other, the first surface connects the two second surfaces, and the area of ​​the first surface is larger than the area of ​​the second surface, the first surface is arranged opposite to the adhesive assembly, and the first surface is bonded to the adhesive layer.

[0026] In a third aspect, an embodiment of the present application further proposes an electrical device, which includes a battery as described in any embodiment of the third aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0028] FIG1 is a schematic diagram of an embodiment of a bonding assembly of the present application.

[0029] FIG2 is a schematic diagram of an embodiment of a battery module of the present application.

[0030] FIG3 is a schematic diagram of a battery cell in a battery according to an embodiment of the present application.

[0031] FIG. 4 is an exploded schematic diagram of an embodiment of the battery cell of FIG. 3 .

[0032] FIG5 is a schematic diagram of an embodiment of a battery module of the present application.

[0033] FIG6 is a schematic diagram of an embodiment of a battery pack of the present application.

[0034] FIG. 7 is an exploded schematic diagram of the embodiment of the battery pack shown in FIG. 6 .

[0035] FIG8 is a schematic diagram of an embodiment of an electric device including the battery cell of the present application as a power source.

[0036] The drawings are not necessarily drawn to scale.

[0037] The following are the descriptions of the reference numerals:

[0038] 1. Battery pack; 2. Upper box; 3. Lower box; 4. Battery module;

[0039] 5. Battery cell; 51. Housing; 52. Electrode assembly;

[0040] 53. Cover plate;

[0041] 6. Electrical devices;

[0042] 7. Adhesive assembly; 71. Main component; 72. Connecting component; 721. Connecting layer; 722. Base material; 723. Adhesive layer. DETAILED DESCRIPTION

[0043] Below, the embodiments of the adhesive assembly, battery, and electrical device of the present application are described in detail with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there may be cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0044] " Range " disclosed in this application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be inclusive or exclusive of end values, and can be arbitrarily combined, that is, any lower limit can form a range with any upper limit combination. For example, if the range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that the range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3,4 and 5 are listed, then the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, a numerical range of "0 to 5" indicates that all real numbers between "0 and 5" are listed herein, and "0 to 5" is merely an abbreviation for a combination of these values. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0045] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0046] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0047] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0048] The term "plurality" used in this application refers to two or more (including two).

[0049] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0050] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0051] When a battery includes multiple battery cells, in order to increase the structural stability of the battery, an adhesive assembly is usually set between two adjacent battery cells. However, the structural stability within the adhesive assembly itself may be poor, resulting in the adhesive assembly itself being prone to problems such as delamination and peeling, resulting in poor structural stability of the battery after it is assembled to form a battery.

[0052] In view of the above problems, the embodiments of the present application propose an adhesive assembly, which includes a main member and a connecting member connected to at least one side of the main member. The connecting member is a multi-layer structure, connected to the main member via a connecting layer. The connecting layer and the main member are both mainly made of rubber material, and their material structure is similar. The adhesion between the two is strong, which makes it difficult for the main member and the connecting member to delaminate and peel off. It can improve the structural stability of the adhesive assembly itself. When the adhesive assembly is applied to a battery, it can improve the structural stability of the battery. The technical solution of this application is described in detail below.

[0053] [Bonded components]

[0054] In a first aspect, an embodiment of the present application provides an adhesive assembly.

[0055] As shown in Figure 1, the bonding assembly 7 includes a main component 71 and a connecting component 72, the main component 71 includes a first rubber; the connecting component 72 is connected to at least one side of the main component 71 along its own thickness direction, the connecting component 72 includes a substrate 722, a connecting layer 721 and an adhesive layer 723, the connecting layer 721 is arranged on the side of the substrate 722 facing the main component 71, and adheres the substrate 722 and the main component 71, the connecting layer 721 includes a second rubber, the material of the second rubber and the first rubber is the same or different, and the adhesive layer 723 is adhered to the side of the substrate 722 away from the connecting layer 721.

[0056] The main component 71 includes a first rubber. The first rubber is elastic and can be deformed under the action of an external force and can restore its original shape after the external force is removed, that is, the first rubber has the ability of reversible deformation. In some embodiments, the main material of the main component 71 includes the first rubber, that is, it can be understood that the main component 71 is mainly made of the first rubber. In other embodiments, the main component 71 includes a central area and an edge area. The edge area is arranged around the central area and connected to the central area. The edge area can be made of the first rubber, and the central area can be made of other materials such as aerogel insulation material, mica, rubber and the like. The rubber material of the central area is different from the rubber material of the edge area. The aerogel insulation pad includes at least one of a silica material with a ceramic fiber as the base material, a silica material with a pre-oxidized silk as the base material, and a silica material with a glass fiber as the base material; mica is a layered silicate mineral material. When the adhesive assembly 7 is applied to a battery, the battery cells in the battery may expand in volume during the charge and discharge cycle, exerting a force such as an extrusion force on the main component 71. The main component 71 can deform to relieve the extrusion force, thereby reducing the risk of extrusion damage to the battery cells and improving the structural stability of the battery.

[0057] The main component 71 may be a layered structure, such as a single-layer structure or a multi-layer structure. When the main component 71 is a multi-layer structure, the materials of the multi-layer structure may be the same or different.

[0058] The main member 71 includes two opposing sides along its thickness. A connecting member 72 is connected to at least one of the two sides. Specifically, one side may be connected to the connecting member 72, while the other side may be connected to another adhesive layer, such as an acrylic pressure-sensitive adhesive. Alternatively, both sides may be connected to the connecting member 72. When both sides are connected, the overall structural stability of the adhesive assembly 7 is increased, and the connection strength with the battery cells on both sides can be improved. The connecting member 72 is configured to bond to the battery cells in the battery. The connecting member 72 has a multi-layer structure. For example, the connecting member 72 includes a substrate 722, a connecting layer 721, and an adhesive layer 723. The substrate 722 supports the connecting member 72. The connecting layer 721 is located on one side of the substrate 722 along its thickness, and the adhesive layer 723 is located on the other side of the substrate 722 along its thickness. The connecting layer 721 bonds the substrate 722 to the main member 71, and the adhesive layer 723 is configured to bond the substrate 722 to the battery cells.

[0059] The connecting layer 721 includes a second rubber, which also has the ability of reversible deformation, and can further alleviate the volume expansion effect during the cyclic charge and discharge process of the battery cell. The material of the second rubber and the first rubber can be the same or different. Since the connecting layer 721 and the main component 71 are both made of rubber, the material compatibility is good, and the interface adhesion between the connecting layer 721 and the main component 71 is strong. The connecting layer 721 can be directly connected to the surface of the main component 71, thereby improving the connection stability between the connecting layer 721 and the main component 71. Optionally, the connecting layer 721 is connected to the surface of the main component 71. When the adhesive assembly 7 is applied to the battery, the battery cell in the battery may expand in volume during the cyclic charge and discharge process, and a force such as an extrusion force is applied to the connecting component 72. The connecting layer 721 in the connecting component 72 can deform to alleviate the extrusion force, reduce the risk of extrusion damage to the battery cell, and improve the structural stability of the battery.

[0060] Compared with the related art, due to the poor compatibility of the material of acrylic pressure-sensitive adhesive and rubber, the connection stability of pressure-sensitive adhesive and rubber is poor. In order to improve the connection stability of pressure-sensitive adhesive and rubber, the related art sets a primer on the rubber surface to increase the interfacial adhesion between pressure-sensitive adhesive and rubber. However, due to the poor stability of the primer process, when the release paper is torn off, the local area of ​​the pressure-sensitive adhesive may fall off from the rubber surface, resulting in an unstable combination of the two, and the connection stability of pressure-sensitive adhesive and rubber is still not significantly improved. The connecting layer 721 and the main member 71 of the embodiment of the present application are both made of rubber, and the compatibility of their materials is good. The interfacial adhesion between the connecting layer 721 and the main member 71 is strong. The connecting layer 721 can be directly connected to the surface of the main member 71, and the primer layer can be not set on the surface of the main member 71 to increase the interfacial adhesion between the connecting layer 721 and the main member 71.

[0061] According to the bonding assembly 7 in the embodiment of the present application, it includes a main body component 71 and a connecting member 72. The main body component 71 can buffer the volume expansion of the battery cell and improve the structural stability of the battery; the connecting member 72 is connected to the main body component 71 and can bond the main body component 71 and the battery cell, and the connecting member 72 is connected to the main body component 71 through a connecting layer 721. The material of the connecting layer 721 and the main body component 71 are both rubber materials with good material compatibility. The interface bonding force between the connecting layer 721 and the main body component 71 is strong, which can improve the connection stability between the connecting layer 721 and the main body component 71 and enhance the structural stability of the bonding assembly 7 itself. When the bonding assembly 7 is applied to the battery, the structural stability of the battery can be improved.

[0062] In some embodiments, the elastic modulus of the first rubber is 0.1 MPa to 20 MPa; optionally 0.1 MPa to 10 MPa; optionally 0.1 MPa to 5 MPa, or optionally 3 MPa to 5 MPa.

[0063] The elastic modulus primarily refers to the maximum stress required for the first rubber member to undergo a unit of elastic deformation under external force, reflecting the first rubber member's ability to resist elastic deformation. During the charge and discharge process, the battery cells may expand in volume, exerting a compressive force on the first rubber member. This compressive force allows the first rubber member to deform to a certain extent, mitigating the risk of cell collapse and improving the overall structural stability of the battery.

[0064] Illustratively, the elastic modulus of the first rubber may be 0.10 MPa, 0.20 MPa, 0.30 MPa, 0.40 MPa, 0.50 MPa, 0.80 MPa, 1.00 MPa, 1.50 MPa, 2.00 MPa, 2.50 MPa, 3.00 MPa, 3.50 MPa, 4.00 MPa, 5.00 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, 12 MPa, 13 MPa, 15 MPa, 18 MPa, 20 MPa, or a range consisting of any two of the above values.

[0065] In this application, the elastic modulus of a material has a well-known meaning in the art and can be tested using instruments and methods well-known in the art, for example, according to the method for determining the compressive elastic modulus of plastics in GB / T 14694-1993.

[0066] In some embodiments, the first rubber can include at least one of an olefin polymer and an organosiloxane polymer. Optionally, the olefin polymer includes at least one of cis-1,4-polyisoprene, cis-1,4-polybutadiene, polychloroprene, an organosiloxane polymer, and ethylene propylene diene monomer (EPDM). The first rubber made of these materials has good compatibility with the connecting layer 721, thereby improving the structural stability of the adhesive assembly 7.

[0067] Organosiloxane polymers refer to polymers whose main molecular chains are mainly composed of alternating silicon atoms and oxygen atoms.

[0068] Optionally, the organic siloxane polymer may include at least one of polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylphenylvinylsiloxane, and polyfluorosiloxane.

[0069] In some embodiments, the thickness of the main member 71 may be 1000 μm to 3000 μm. When the thickness of the main member 71 is within the above range, the overall deformation capability of the adhesive assembly 7 can be improved, thereby enhancing the overall structural stability of the battery.

[0070] Illustratively, the thickness of the main component 71 can be 1000μm, 1100μm, 1200μm, 1300μm, 1400μm, 1500μm, 1600μm, 1700μm, 1800μm, 1900μm, 2000μm, 2100μm, 2200μm, 2300μm, 2400μm, 2500μm, 2600μm, 2700μm, 2800μm, 2900μm, 3000μm or a range consisting of any two of the above values.

[0071] In some embodiments, the connecting layer 721 is bonded to the surface of the main member 71, and the tensile shear strength of the connecting layer 721 is ≥ 0.3 MPa, and can be 0.3 MPa to 0.7 MPa. When the tensile shear strength of the connecting layer 721 is within this range, the bonding between the connecting layer 721 and the main member 71 is strong, and the two are unlikely to separate, thereby improving the overall structural stability of the adhesive assembly 7.

[0072] In the embodiments of the present application, the tensile shear strength is a well-known meaning in the art. Specifically, the shear strength of the connecting layer 721 refers to the shear force that the connecting layer 721 can withstand per unit area when the connecting layer 721 is destroyed. It can be tested with reference to GB / T7124-2008. For example, the connecting layer 721 of the connecting member 72 can be tested by adhering it to the surface of the main member 71 and letting it stand for less than 20 minutes. The tensile shear strength of the connecting layer 721 is ≥0.3MPa; optionally ≥0.42MPa; and optionally 0.42MPa to 0.55MPa. The connecting layer 721 of the connecting member 72 is adhered to the surface of the main member 71 and let it stand for less than 20 minutes. This means that the timing starts when the connecting layer 721 is adhered to the surface of the main member 71, and the tensile shear strength is tested within 20 minutes. For another example, the connection layer 721 can be tested by bonding it to the surface of the main component 71 and leaving it to stand for more than 3 days. The tensile shear strength of the connection layer 721 is ≥ 0.4 MPa; it can be optionally 0.42 MPa to 0.72 MPa; it can be optionally 0.5 MPa to 0.72 MPa.

[0073] Exemplarily, the tensile shear strength of the connecting layer 721 can be 0.30 MPa, 0.35 MPa, 0.38 MPa, 0.40 MPa, 0.42 MPa, 0.45 MPa, 0.48 MPa, 0.50 MPa, 0.52 MPa, 0.55 MPa, 0.56 MPa, 0.58 MPa, 0.60 MPa, 0.62 MPa, 0.65 MPa, 0.68 MPa, 0.70 MPa, 0.72 MPa or a range consisting of any two of the above values.

[0074] In some embodiments, the elastic modulus of the second rubber is 0.1 MPa to 20 MPa; optionally 0.1 MPa to 10 MPa; optionally 0.1 MPa to 5 MPa; optionally 3 MPa to 5 MPa.

[0075] The elastic modulus primarily refers to the maximum stress required for the second rubber member to undergo a unit of elastic deformation under external force, reflecting its ability to resist elastic deformation. During the charge and discharge process, the battery cells may expand in volume, exerting a compressive force on the second rubber member. This compressive force allows the second rubber member to deform to a certain extent, mitigating the risk of cell collapse and improving the overall structural stability of the battery.

[0076] Illustratively, the elastic modulus of the second rubber may be 0.10 MPa, 0.20 MPa, 0.30 MPa, 0.40 MPa, 0.50 MPa, 0.80 MPa, 1.00 MPa, 1.50 MPa, 2.00 MPa, 2.50 MPa, 3.00 MPa, 3.50 MPa, 4.00 MPa, 5.00 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, 12 MPa, 13 MPa, 15 MPa, 18 MPa, 20 MPa, or a range consisting of any two of the above values.

[0077] In some embodiments, the second rubber comprises at least one of an olefin polymer and an organosiloxane polymer; optionally, the olefin polymer comprises at least one of cis-1,4-polyisoprene, cis-1,4-polybutadiene, polychloroprene, an organosiloxane polymer, and ethylene propylene diene monomer (EPDM); optionally, the first rubber and the second rubber each independently comprise an organosiloxane polymer. The second rubber of the aforementioned material exhibits good compatibility with the main component 71, thereby improving the structural stability of the adhesive assembly 7. A primer coating process is not required on the surface of the main component 71, meaning that the connecting component 72 can be bonded together, thus avoiding the process stability issues associated with primer coating. Furthermore, due to the good compatibility and strong bonding between the connecting layer 721 and the main component 71, the two are less likely to peel off or separate.

[0078] Optionally, the organosiloxane polymer may include at least one of polydimethylsiloxane, polymethylvinyl, polymethylphenylvinyl, and polyfluorosiloxane.

[0079] In some embodiments, the ratio of the thickness of the connecting layer 721 to the thickness of the main member 71 is 1:(15 to 200), optionally 1:(29 to 200), or optionally 1:(29 to 167). When the ratio of the thickness of the connecting layer 721 to the thickness of the main member 71 is within the above range, the bonding strength between the connecting layer 721 and the main member 71 can be increased, thereby improving the overall structural stability of the adhesive assembly 7.

[0080] For example, the ratio of the thickness of the connecting layer 721 to the thickness of the main member 71 can be 1:15, 1:18, 1:20, 1:22, 1:23, 1:25, 1:28, 1:29, 1:30, 1:35, 1:40, 1:45, 1:48, 1:50, 1:55, 1:60, 1:65, 1:70, 1:75, 1:80, 1:85, 1:90, 1:9 5. 1:100, 1:105, 1:110, 1:115, 1:120, 1:125, 1:130, 1:135, 1:140, 1:145, 1:150, 1:155, 1:160, 1:167, 1:170, 1:175, 1:180, 1:185, 1:190, 1:195, 1:200 or a range consisting of any two of the above values.

[0081] In some embodiments, the thickness of the connecting layer 721 is 15 μm to 35 μm. When the thickness of the connecting layer 721 is within the above range, it is beneficial to improve the bonding strength between the connecting layer 721 and the main component 71.

[0082] Exemplarily, the thickness of the connecting layer 721 can be 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 31μm, 32μm, 33μm, 34μm, 35μm or a range consisting of any two of the above values.

[0083] In some embodiments, the substrate 722 may include at least one of polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), and polyamide (PA). When the substrate 722 is selected from the above materials, it can play a supporting role.

[0084] In some embodiments, the thickness of the substrate 722 is 5 μm to 15 μm, optionally 6 μm to 15 μm, optionally 10 μm to 15 μm, or optionally 10 μm to 12 μm. When the thickness of the substrate 722 is within the above range, it can provide good support for the adhesive assembly 7.

[0085] Illustratively, the thickness of the substrate 722 may be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, or a range consisting of any two of the above values.

[0086] In some embodiments, when the adhesive assembly 7 is assembled to the battery, the adhesive assembly 7 may contact the housing of the battery cell. The housing may be made of metal. For example, the metal material may include aluminum, copper, or stainless steel. The adhesive layer 723 of the adhesive assembly 7 is configured to bond to the metal surface. The tensile shear strength of the adhesive layer 723 is ≥ 0.7 MPa; optionally, it may be 0.7 MPa to 3.0 MPa; or optionally, it may be 1.34 MPa to 3.0 MPa. When the tensile shear strength of the adhesive layer 723 is within the above range, the bonding force between the adhesive layer 723 and the metal is strong, and the two are not easily separated, thereby improving the overall structural stability of the adhesive assembly 7.

[0087] Exemplarily, the adhesive layer 723 of the adhesive assembly 7 is configured to be bonded to an aluminum metal surface, and the tensile shear strength of the adhesive layer 723 is ≥0.7 MPa; optionally 0.7 MPa to 3.0 MPa; optionally 1.34 MPa to 3.0 MPa.

[0088] When the tensile shear strength of the adhesive layer 723 is within the above range, the bonding force between the adhesive layer 723 and the aluminum metal is relatively strong, and the two are not easily separated, thereby improving the overall structural stability of the adhesive assembly 7.

[0089] In the embodiments of the present application, the tensile shear strength is a term commonly known in the art. Specifically, the shear strength of the adhesive layer 723 refers to the shear force that the adhesive layer 723 can withstand per unit area when the adhesive layer 723 is damaged. Testing can be performed with reference to GB / T7124-2008. For example, the adhesive layer 723 of the connecting member 72 can be tested by adhering it to the surface of aluminum metal and allowing it to stand for less than 20 minutes. The tensile shear strength of the adhesive layer 723 is ≥ 0.7 MPa; optionally 0.7 MPa to 1.7 MPa; optionally 1.34 MPa to 1.7 MPa; or optionally 1.34 MPa to 1.5 MPa. The adhesive layer 723 of the connecting member 72 is bonded to the surface of aluminum metal and allowed to stand for less than 20 minutes, which means that the timing starts from the moment the adhesive layer 723 is bonded to the surface of aluminum metal, and the tensile shear strength is tested within 20 minutes. For another example, the adhesive layer 723 can be tested by bonding to the surface of aluminum metal and left to stand for more than 3 days. The tensile shear strength of the adhesive layer 723 is ≥1.5MPa; it can be optionally 1.5MPa to 3.0MPa; it can be optionally 2.1MPa to 3.0MPa; it can be optionally 2.1MPa to 2.32MPa.

[0090] Exemplarily, the adhesive layer 723 of the adhesive assembly 7 is configured to bond to metal, and the tensile shear strength of the adhesive layer 723 can be 0.7 MPa, 0.8 MPa, 0.9 MPa, 1.0 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa, 1.5 MPa, 1.6 MPa, 1.7 MPa, 1.8 MPa, 1.9 MPa, 2.0 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 3.0 MPa or a range consisting of any two of the above values.

[0091] In some embodiments, when the adhesive assembly 7 is assembled to the battery, the adhesive assembly 7 may contact the shell of the battery cell. The shell may be made of an organic polymer material. For example, the organic polymer may include at least one of polyethylene terephthalate (PET) and polycarbonate. Optionally, the organic polymer includes polyethylene terephthalate (PET). The adhesive layer 723 of the adhesive assembly 7 is configured to bond to the organic polymer. The tensile shear strength of the adhesive layer 723 is ≥ 0.7 MPa; optionally, it is 0.7 MPa to 3.0 MPa; or optionally, it is 1.34 MPa to 3.0 MPa. When the tensile shear strength of the adhesive layer 723 is within the above range, the bonding force between the adhesive layer 723 and the organic polymer is strong, and the two are not easily separated, thereby improving the overall structural stability of the adhesive assembly 7.

[0092] Exemplarily, the adhesive layer 723 of the adhesive component 7 is configured to be bonded to PET, and the tensile shear strength of the adhesive layer 723 is ≥0.7 MPa; optionally 0.7 MPa to 3.0 MPa; optionally 1.34 MPa to 3.0 MPa.

[0093] When the tensile shear strength of the adhesive layer 723 is within the above range, the bonding force between the adhesive layer 723 and the PET is relatively strong, and the two are not easily separated, thereby improving the overall structural stability of the adhesive assembly 7.

[0094] In the embodiments of the present application, the tensile shear strength is a term commonly known in the art. Specifically, the shear strength of the adhesive layer 723 refers to the shear force per unit area that the adhesive layer 723 can withstand when the adhesive layer 723 is damaged. Testing can be performed with reference to GB / T7124-2008. For example, the adhesive layer 723 of the connecting member 72 can be tested by adhering it to the surface of PET and allowing it to stand for less than 20 minutes. The tensile shear strength of the adhesive layer 723 is ≥ 0.7 MPa; the range can be 0.7 MPa to 1.7 MPa; the range can be 1.34 MPa to 1.7 MPa; or the range can be 1.34 MPa to 1.5 MPa. The adhesive layer 723 of the connecting member 72 is bonded to the surface of PET and allowed to stand for less than 20 minutes, which means that the timing starts from the moment the adhesive layer 723 is bonded to the surface of PET, and the tensile shear strength is tested within 20 minutes. For another example, the adhesive layer 723 can be tested by being bonded to the surface of PET and left to stand for more than 3 days. The tensile shear strength of the adhesive layer 723 is ≥ 1.5 MPa; it can be optionally 1.5 MPa to 3.0 MPa; it can be optionally 2.1 MPa to 3.0 MPa; it can be optionally 2.1 MPa to 2.32 MPa.

[0095] Exemplarily, the adhesive layer 723 of the adhesive component 7 is configured to bond to PET, and the tensile shear strength of the adhesive layer 723 can be 0.7 MPa, 0.8 MPa, 0.9 MPa, 1.0 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa, 1.5 MPa, 1.6 MPa, 1.7 MPa, 1.8 MPa, 1.9 MPa, 2.0 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 3.0 MPa or a range consisting of any two of the above values.

[0096] In some embodiments, the bonding layer 723 includes at least one of an acrylic polymer and an olefin polymer; optionally, the bonding layer 723 includes an acrylic polymer, and the bonding force between the bonding layer 723 and the battery cell is stronger; and since a primer is required when the bonding layer 723 and the main component 71 are directly bonded, the embodiment of the present application provides a connecting layer 721 between the bonding layer 723 and the main component 71, thereby improving the bonding strength between the main component 71 and the bonding layer 723 and eliminating the primer process, etc.

[0097] Illustratively, the acrylic polymer includes at least one of polymethyl methacrylate, polyethyl acrylate, and polybutyl acrylate.

[0098] In some embodiments, the thickness of the adhesive layer 723 is 15 μm to 25 μm. When the thickness of the adhesive layer 723 is within the above range, the adhesive force between the adhesive layer 723 and the battery cell is relatively strong.

[0099] Illustratively, the thickness of the adhesive layer 723 may be 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, or a range consisting of any two of the above values.

[0100] In the embodiment of the present application, the thickness of each layer in the adhesive assembly 7 has a meaning well known in the art and can be detected using equipment and methods well known in the art, such as using a micrometer to measure the thickness of each layer in the adhesive assembly 7.

[0101] [Battery]

[0102] In a second aspect, an embodiment of the present application proposes a battery.

[0103] As shown in FIG. 2 , the battery according to the embodiment of the present application may include one battery cell 5 or multiple battery cells 5 . In the case where the battery includes multiple battery cells 5 , the battery may include a battery module 4 or a battery pack.

[0104] When a battery includes one or more battery cells 5, an adhesive assembly 7 may be provided on the outside of each battery cell 5, with the adhesive layer 723 of the adhesive assembly 7 bonded to the surface of the battery cell 5. The adhesive assembly 7 has strong adhesion, which can enhance the bonding strength between the adhesive assembly 7 and the battery cell 5, thereby improving the structural stability of the battery. Optionally, one side of the adhesive assembly 7 is connected to the battery cell 5, and the other side can be connected to the battery casing, etc.

[0105] When the battery includes multiple battery cells 5, an adhesive assembly 7 may be provided between two adjacent battery cells 5, with the adhesive layer 723 of the adhesive assembly 7 bonded to the surface of the battery cell 5. The adhesive assembly 7 has a strong adhesive force, which can enhance the bonding strength between the two adjacent battery cells 5, thereby improving the structural stability of the battery.

[0106] In some embodiments, the battery cell 5 includes two opposing first surfaces and two opposing second surfaces, the first surface connecting the two second surfaces and having an area greater than that of the second surfaces, the first surface being disposed opposite the adhesive assembly 7 and bonded to the adhesive layer 723. Due to the relatively large area of ​​the first surface, the bonding between the first surface and the adhesive layer 723 can further enhance the bonding strength between two adjacent battery cells 5, thereby further improving the structural stability of the battery.

[0107] In some embodiments, the battery may further include a box body, and the box body and the battery cell 5 are connected via an adhesive assembly 7 . The connection via the adhesive assembly 7 can improve the connection stability between the box body and the battery cell 5 .

[0108] In some embodiments, the battery cell 5 may include a positive electrode sheet, a negative electrode sheet, and a separator, wherein the separator is located between the positive electrode sheet and the negative electrode sheet.

[0109] [Positive electrode]

[0110] In some embodiments, the battery cell further includes a positive electrode tab.

[0111] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode active material layer includes a positive electrode active material.

[0112] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0113] In some embodiments, the positive electrode current collector may be a metal foil or a composite current collector. For example, aluminum foil may be used as the metal foil. The composite current collector may include a polymer material base and a metal layer formed on at least one surface of the polymer material base. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0114] In some embodiments, the positive electrode active material may be a positive electrode active material for battery cells known in the art. As an example, the positive electrode active material may include at least one of the following materials: a layered positive electrode active material (e.g., ternary, lithium nickelate / sodium, lithium cobaltate / sodium, lithium manganate / sodium, lithium-rich / sodium layered, and rock salt layered materials), an olivine-type phosphate active material, and a spinel-structured positive electrode active material (e.g., spinel lithium manganate, spinel lithium nickel manganate, lithium-rich spinel lithium manganate, and lithium nickel manganate).

[0115] For example, the general formula of the layered positive electrode active material is Li x A y Ni a Co b Mn c M (1-a-b-c) Y z, wherein 0≤x≤2.1, 0≤y≤2.1, and 0.9≤x+y≤2.1; 0≤a≤1, 0≤b≤1, 0≤c≤1, and 0.1≤a+b+c≤1; 1.8≤z≤3.5; A includes one or more of Na, K, and Mg; M includes one or more of B, Mg, Al, Si, P, S, Ca, Sc, Ti, V, Cr, Fe, Cu, Zn, Sr, Y, Zr, Nb, Mo, Cd, Sn, Sb, Te, Ba, Ta, W, Yb, La, and Ce; and Y includes one or more of O and F. Specifically, the layered positive electrode active material may include lithium cobalt oxide (LCO), lithium nickel oxide (LNO), lithium manganese oxide (LMO), and the like.

[0116] Optionally, the layered positive electrode active material is a ternary material, for example, 0<a≤1, 0<b≤1, 0<c≤1, for example, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(NCM333),LiNi 0.8 Co 0.1 Mn 0.1 O2(NCM811) and LiNi 0.5 Co 0.2 Mn 0.3 One or more of O2 (NCM523).

[0117] For example, the general formula of the olivine phosphate active material is Li x A y Me a M b P 1-c X c Y z , wherein 0≤x≤1.3, 0≤y≤1.3, and 0.9≤x+y≤1.3; 0.9≤a≤1.5, 0≤b≤0.5, and 0.9≤a+b≤1.5; 0≤c≤0.5; 3≤z≤5; A includes one or more of Na, K, and Mg; Me includes one or more of Mn, Fe, Co, and Ni; M includes one or more of B, Mg, Al, Si, P, S, Ca, Sc, Ti, V, Cr, Cu, Zn, Sr, Y, Zr, Nb, Mo, Cd, Sn, Sb, Te, Ba, Ta, W, Yb, La, and Ce; X includes one or more of S, Si, Cl, B, C, and N; and Y includes one or more of O and F. Specifically, the olivine-type phosphate active material includes one or more of LiFePO4, LiMnPO4, LiNiPO4, and LiCoPO4.

[0118] For example, the general formula of the positive electrode active material of the spinel structure is Li x Ay Mn a M 2-a Y z , wherein 0≤x≤2, 0≤y≤1, and 0.9≤x+y≤2; 0.5≤a≤2; 3≤z≤5; A includes one or more of Na, K, and Mg; M includes one or more of Ni, Co, B, Mg, Al, Si, P, S, Ca, Sc, Ti, V, Cr, Fe, Cu, Zn, Sr, Y, Zr, Nb, Mo, Cd, Sn, Sb, Te, Ba, Ta, W, Yb, La, and Ce; and Y includes one or more of O and F. Specifically, the positive active materials of the spinel structure include LiMn2O4, LiNi 0.5 Mn 1.5 O4、LiCr 0.3 Mn 1.7 O4、Li 1.1 Al 0.1 Mn 1.9 O4, Li2Mn2O4 and Li 1.5 One or more of Mn2O4.

[0119] During the charge and discharge process, battery cells are accompanied by the deintercalation and deintercalation of active ions, such as Li, and their molar content varies when the battery cells are discharged to different states. The molar content of Li in the examples of positive electrode active materials in the embodiments of this application refers to the material's initial state, i.e., the state before the materials are added. When the positive electrode active material is used in a battery system, the molar content of Li may change after charge and discharge cycles.

[0120] In the examples of the positive electrode active materials in the embodiments of the present application, the molar content of oxygen O is only a theoretical value. Lattice oxygen release will cause the molar content of oxygen O to change. In practice, the molar content of oxygen O will fluctuate.

[0121] In some embodiments, the positive electrode active material layer may further optionally include a binder. As an example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, and a fluorine-containing acrylate resin.

[0122] In some embodiments, the positive electrode active material layer may further include a conductive agent. For example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0123] In some embodiments, the positive electrode sheet can be prepared by the following method: the components for preparing the positive electrode sheet, such as the positive electrode active material, the conductive agent, the binder and any other components, are dispersed in a solvent (such as N-methylpyrrolidone) to form a positive electrode slurry; the positive electrode slurry is coated on the positive electrode current collector, and after drying, cold pressing and other processes, the positive electrode sheet can be obtained.

[0124] [Negative electrode]

[0125] In some embodiments, the battery cell further includes a negative electrode plate.

[0126] In some embodiments, the negative electrode sheet includes a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector and comprising a negative electrode active material. For example, the negative electrode current collector has two opposing surfaces in its thickness direction, and the negative electrode film layer is disposed on either or both of the two opposing surfaces of the negative electrode current collector.

[0127] The negative electrode active material can be any negative electrode active material known in the art for use in battery cells. For example, the negative electrode active material may include, but is not limited to, at least one of natural graphite, artificial graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may include at least one of elemental silicon, silicon oxide, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material may include at least one of elemental tin, tin oxide, and a tin alloy.

[0128] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The present application embodiment does not particularly limit the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent is ≤5 wt% based on the total weight of the negative electrode film layer.

[0129] In some embodiments, the negative electrode film layer may further optionally include a negative electrode binder. The present application embodiment does not particularly limit the type of the negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), a water-soluble unsaturated resin SR-1B, a water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder is ≤5 wt% based on the total weight of the negative electrode film layer.

[0130] In some embodiments, the negative electrode film layer may optionally include other additives. For example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, and the like. In some embodiments, the weight percentage of the other additives is ≤ 2 wt % based on the total weight of the negative electrode film layer.

[0131] In some embodiments, the negative electrode current collector may be a metal foil or a composite current collector. As an example of a metal foil, copper foil may be used. The composite current collector may include a polymer material base layer and a metal material layer formed on at least one surface of the polymer material base layer. As an example, the metal material may include at least one of copper, a copper alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, and a silver alloy. As an example, the polymer material base layer may include at least one of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), and polyethylene (PE).

[0132] The negative electrode film layer is typically formed by coating a negative electrode slurry onto a negative electrode current collector, drying, and cold pressing. The negative electrode slurry is typically formed by dispersing a negative electrode active material, an optional conductive agent, an optional binder, and other optional additives in a solvent and stirring until uniformly mixed. The solvent may be, but is not limited to, N-methylpyrrolidone (NMP) or deionized water.

[0133] The negative electrode plate does not exclude other additional functional layers in addition to the negative electrode film layer. For example, in some embodiments, the negative electrode plate described in the embodiments of the present application further includes a conductive primer layer (e.g., composed of a conductive agent and an adhesive) sandwiched between the negative electrode current collector and the negative electrode film layer and disposed on the surface of the negative electrode current collector. In other embodiments, the negative electrode plate described in the embodiments of the present application further includes a protective layer covering the surface of the negative electrode film layer.

[0134] [Isolation film]

[0135] In some embodiments, the battery cell further includes a separator.

[0136] The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0137] In some embodiments, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0138] In some embodiments, the positive electrode sheet, the separator, and the negative electrode sheet may be formed into an electrode assembly through a winding process and / or a lamination process.

[0139] In some embodiments, the battery cell may include an outer packaging that can be used to encapsulate the electrode assembly and the electrolyte.

[0140] In some embodiments, the outer packaging of the battery cell may be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, etc. The outer packaging of the battery cell may also be a soft package, such as a bag-type soft package. The soft package may be made of plastic, such as at least one of polypropylene (PP), polybutylene terephthalate (PBT), and polybutylene succinate (PBS).

[0141] [Electrolyte]

[0142] In some embodiments, the battery cell further includes an electrolyte.

[0143] During the charge and discharge process of a battery cell, active ions are embedded and released back and forth between the positive and negative electrodes, and the electrolyte conducts the active ions between the positive and negative electrodes. The present application embodiment does not specifically limit the type of electrolyte, and the electrolyte can be selected based on actual needs.

[0144] The electrolyte solution includes an electrolyte salt and a solvent. The types of the electrolyte salt and the solvent are not particularly limited and can be selected according to actual needs.

[0145] When the battery cell of the present application is a lithium-ion battery, as an example, the electrolyte salt may include but is not limited to at least one of lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bisfluorosulfonyl imide (LiFSI), lithium bistrifluoromethanesulfonyl imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalatoborate (LiDFOB), lithium dioxalatoborate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorobisoxalatophosphate (LiDFOP) and lithium tetrafluorooxalatophosphate (LiTFOP).

[0146] When the battery cell of the present application is a sodium ion battery, as an example, the electrolyte salt may include but is not limited to at least one of sodium hexafluorophosphate (NaPF6), sodium tetrafluoroborate (NaBF4), sodium perchlorate (NaClO4), sodium hexafluoroarsenate (NaAsF6), sodium bis(fluorosulfonyl)imide (NaFSI), sodium bis(trifluoromethanesulfonyl)imide (NaTFSI), sodium trifluoromethanesulfonate (NaTFS), sodium difluorooxalatoborate (NaDFOB), sodium dioxalatoborate (NaBOB), sodium difluorophosphate (NaPO2F2), sodium difluorobis(oxalatophosphate) (NaDFOP) and sodium tetrafluorooxalatophosphate (NaTFOP).

[0147] As an example, the solvent may include, but is not limited to, at least one of ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), ethyl methyl sulfone (EMS) and diethyl sulfone (ESE).

[0148] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature power performance.

[0149] The present application has no particular limitation on the shape of the battery cell, which can be cylindrical, square or any other shape. FIG3 shows a battery cell 5 with a square structure as an example.

[0150] In some embodiments, as shown in FIG4 , the outer packaging may include a shell 51 and a cover plate 53. The shell 51 may include a bottom plate and a side plate connected to the bottom plate, and the bottom plate and the side plate enclose a receiving cavity. The shell 51 has an opening connected to the receiving cavity, and the cover plate 53 is used to cover the opening to close the receiving cavity. The positive electrode sheet, the negative electrode sheet and the separator may be formed into an electrode assembly 52 through a winding process and / or a lamination process. The electrode assembly 52 is encapsulated in the receiving cavity. The electrolyte is impregnated in the electrode assembly 52. ​​The number of electrode assemblies 52 contained in the battery cell 5 may be one or more, which can be adjusted according to demand.

[0151] The preparation methods of the battery cells of the embodiments of the present application are well known. In some embodiments, a positive electrode sheet, a separator, a negative electrode sheet, and an electrolyte can be assembled to form a battery cell. As an example, the positive electrode sheet, separator, and negative electrode sheet can be wound and / or laminated to form an electrode assembly. The electrode assembly is then placed in an outer packaging, dried, and then injected with electrolyte. The battery cell is then vacuum packaged, allowed to stand, formed, and shaped to obtain a battery cell.

[0152] In some embodiments of the present application, the battery cells according to the embodiments of the present application can be assembled into a battery module. The battery module can contain multiple battery cells, and the specific number can be adjusted according to the application and capacity of the battery module.

[0153] Figure 5 is a schematic diagram of an example battery module 4. As shown in Figure 5 , in the battery module 4, multiple battery cells 5 can be arranged sequentially along the length of the battery module 4. Of course, they can also be arranged in any other manner. The multiple battery cells 5 can further be fixed using fasteners. An adhesive assembly can be provided between adjacent battery cells (the adhesive assembly is not shown in Figure 5 ).

[0154] Optionally, the battery module 4 may further include a housing having an accommodation space, and the plurality of battery cells 5 are accommodated in the accommodation space.

[0155] In some embodiments, the battery modules described above may also be assembled into a battery pack, and the number of battery modules contained in the battery pack may be adjusted according to the application and capacity of the battery pack.

[0156] Figures 6 and 7 are schematic diagrams of an exemplary battery pack 1. As shown in Figures 6 and 7, the battery pack 1 may include a battery box and multiple battery modules 4 disposed within the box. The battery box comprises an upper case 2 and a lower case 3. The upper case 2 covers the lower case 3 and forms an enclosed space for accommodating the battery modules 4. The multiple battery modules 4 may be arranged in any manner within the battery box.

[0157] [Electrical devices]

[0158] The third aspect of the embodiments of the present application provides an electric device, which includes at least one of the battery cells, battery modules or battery packs of the embodiments of the present application. The battery cells, battery modules or battery packs can be used as the power source of the electric device, and can also be used as the energy storage unit of the electric device. The electric device can be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc.

[0159] The electrical device may select a battery cell, a battery module or a battery pack according to its usage requirements.

[0160] FIG8 is a schematic diagram of an exemplary electric device 6. The electric device 6 is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. To meet the high power and high energy density requirements of the electric device 6, a battery pack or battery module may be used.

[0161] As another example, an electric device may be a mobile phone, a tablet computer, a laptop computer, etc. Such an electric device is usually required to be lightweight and thin, and may use a battery cell as a power source.

[0162] Example

[0163] The following embodiments describe the disclosure of the present invention in more detail, and these embodiments are intended to be illustrative only, as various modifications and variations within the scope of the disclosure of the present invention will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are by mass, and all reagents used in the embodiments are commercially available or synthesized according to conventional methods and can be used directly without further processing, and the instruments used in the embodiments are commercially available.

[0164] Example 1

[0165] The battery includes two battery cells, and an adhesive assembly is arranged between the two battery cells. The adhesive assembly includes a main component and a connecting component. The connecting component is arranged on both sides of the main component. The connecting component includes a substrate, a connecting layer and an adhesive layer. The connecting layer adheres to the main component and the substrate, and the adhesive layer adheres to the surface of the substrate facing away from the connecting layer and adheres to the first side of the battery cell.

[0166] The material of the main component includes an organic siloxane polymer (specifically methyl vinyl siloxane) with a thickness of 2000 μm;

[0167] The material of the connecting layer includes an organic siloxane polymer (specifically methyl silicone), and its thickness is 30 μm;

[0168] The materials of the substrate include polyethylene terephthalate PET, which has a thickness of 10 μm;

[0169] The adhesive layer is made of an acrylic polymer such as polymethyl methacrylate (PMMA) and has a thickness of 20 μm.

[0170] Comparative Example 1

[0171] The battery includes two battery cells, an adhesive assembly is arranged between the two battery cells, the adhesive assembly includes a main component and a connecting component, the connecting component is arranged on both sides of the main component, a primer is arranged between the connecting component and the main component, and the primer includes a silane coupling agent.

[0172] The material of the main component includes an organic silicone polymer, and its thickness is 2000 μm;

[0173] The connecting member is made of an acrylic polymer such as polymethyl methacrylate (PMMA) and has a thickness of 20 μm.

[0174] Example 2-1 and Example 2-3

[0175] The difference from Example 1 is that the material of the connection layer is adjusted.

[0176] In Example 2-1, the connecting layer is made of EPDM material.

[0177] In Example 2-2, the connecting layer is made of cis-1,4-polyisoprene.

[0178] In Example 2-3, the connecting layer uses an organic silicone polymer PMVS.

[0179] Example 3

[0180] The difference from Example 1 is that the material of the adhesive layer is adjusted. The adhesive layer in Example 3 is polyethyl acrylate (PEA).

[0181] Example 4-1 to Example 4-4

[0182] The difference from Example 1 is that the thickness of the connecting layer is adjusted.

[0183] Example 4-5 and Example 4-6

[0184] The difference from Example 1 is that the thickness of the main body component is adjusted.

[0185] Example 5-1 to Example 5-4

[0186] The difference from Example 1 is that the thickness of the adhesive layer was adjusted.

[0187] Example 6-1 to Example 6-3

[0188] The difference from Example 1 is that the material of the main component is adjusted. In Example 6-1, the main component is made of cis-1,4-polybutadiene. In Example 6-2, the main component is made of cis-1,4-polyisoprene. In Example 6-3, the main component is made of polydimethylsiloxane (PDMS).

[0189] Example 7

[0190] The difference from Example 1 is that the material of the substrate is adjusted, and the substrate material is polycarbonate PC.

[0191] Example 8-1 and Example 8-2

[0192] The difference from Example 1 is that the thickness of the substrate is adjusted.

[0193] The relevant parameters of the embodiments and comparative examples are shown in Table 1 and Table 2.

[0194] Test section

[0195] 1. Shear strength test

[0196] Samples were prepared and tested in accordance with GB / T7124-2008. For example, the connecting layer of the test connecting member was bonded to the surface of the main member and allowed to stand for less than 20 minutes. The tensile shear strength of the connecting layer was recorded as the first tensile shear strength of the connecting layer.

[0197] The connecting layer of the connecting component is bonded to the surface of the main component and left to stand for more than 3 days. The tensile shear strength of the connecting layer is recorded as the second tensile shear strength of the connecting layer.

[0198] Samples were prepared and tested in accordance with GB / T7124-2008. For example, the adhesive layer of the test connection member was bonded to the aluminum shell surface of the battery cell and allowed to stand for less than 20 minutes. The tensile shear strength of the adhesive layer was recorded as the first tensile shear strength of the adhesive layer.

[0199] The adhesive layer of the connecting member is adhered to the surface of the aluminum shell of the battery cell and left to stand for more than 3 days. The tensile shear strength of the adhesive layer is recorded as the second tensile shear strength of the adhesive layer.

[0200] Test results

[0201] The test results are shown in Table 1 and Table 2.

[0202] Table 1

[0203] Table 2

[0204] It can be seen from Tables 1 and 2 that Comparative Example 1 uses PMMA to bond with the main component, but due to the low surface energy and high crystallinity of polyacrylates, it is difficult for them to effectively bond with the main component. Therefore, it is necessary to apply a primer on the surface of the main component to improve the bonding strength between PMMA and the main component through the primer. However, due to the instability of the primer process, the bonding between PMMA and the main component is still unstable, and the two are easily peeled off.

[0205] The embodiment of the present application adopts a connecting component with a multi-layer structure, so that the connecting layer of the connecting component is directly bonded to the main component, and the connecting layer adopts a non-polyacrylate material, which has good compatibility and adhesion with the main component, and can improve the bonding force between the connecting component and the main component. In addition, the bonding layer of the connecting component adopts a polyacrylate material, which can still play a good bonding role with the battery cell.

[0206] Furthermore, by adjusting the material of the connecting member, this application discovered that when both the connecting member and the main member are made of organosiloxane polymers, the bonding strength between the two is relatively stronger. Furthermore, by adjusting parameters such as the thickness of the connecting member, the bonding strength between the connecting member and the main member can be improved to a certain extent. By adjusting parameters such as the thickness and material of the adhesive layer, the bonding strength between the adhesive layer and the battery cell can be improved to a certain extent.

[0207] Although illustrative embodiments have been shown and described, those skilled in the art should understand that the above embodiments should not be construed as limitations on the present application, and that changes, substitutions, and modifications may be made to the embodiments without departing from the spirit, principles, and scope of the present application.

Claims

1. A bonding assembly comprising: A main body member including a first rubber; as well as A connecting member connected to at least one side of the main member along its own thickness direction, The connecting member comprises: Base material; A connecting layer is disposed on a side of the substrate facing the main component and bonds the substrate and the main component, wherein the connecting layer comprises a second rubber, and the second rubber and the first rubber are made of the same or different materials; The bonding layer is bonded to a side of the substrate facing away from the connecting layer.

2. The bonding assembly according to claim 1, wherein: The connecting layer is bonded to the surface of the main component, and the tensile shear strength of the connecting layer is ≥0.42MPa.

3. The bonding assembly according to claim 2, wherein: The tensile shear strength of the connecting layer is 0.42 MPa to 0.72 MPa.

4. The bonding assembly according to any one of claims 1 to 3, wherein: The elastic moduli of the first rubber and the second rubber are each independently selected from 0.1 MPa to 20 MPa.

5. The bonding assembly according to claim 4, wherein: The elastic moduli of the first rubber and the second rubber are each independently selected from 0.1 MPa to 5 MPa.

6. The bonding assembly according to claim 4 or 5, wherein: The first rubber and the second rubber each independently include at least one of a polyolefin-based polymer and an organic siloxane-based polymer.

7. The bonding assembly according to claim 6, wherein: The polyolefin polymer includes at least one of cis-1,4-polyisoprene, cis-1,4-polybutadiene, polychloroprene and ethylene-propylene-diene copolymer; and / or The organic siloxane polymer includes at least one of polydimethylsiloxane PDMS, polymethylvinylsiloxane PMVS, polymethylphenylvinylsiloxane and polyfluorosiloxane.

8. The bonding assembly according to any one of claims 1 to 7, wherein: The ratio of the thickness of the connecting layer to the thickness of the main component is 1:(29 to 200).

9. The bonding assembly according to claim 8, wherein: The ratio of the thickness of the connecting layer to the thickness of the main component is 1:(29 to 167).

10. The bonding assembly according to claim 8 or 9, wherein: The thickness of the connecting layer is 15 μm to 35 μm; or The thickness of the main body component is 1000 μm to 3000 μm.

11. The adhesive bonding assembly according to any one of claims 1 to 10, wherein: The adhesive layer is configured to be bonded to a metal surface, and the tensile shear strength of the adhesive layer is ≥ 1.34 MPa; or The adhesive layer is configured to be bonded to the surface of the organic polymer, and the tensile shear strength of the adhesive layer is ≥1.34 MPa.

12. The bonding assembly according to claim 11, wherein: The tensile shear strength of the adhesive layer is 1.34 MPa to 3.0 MPa.

13. The bonding assembly according to any one of claims 1 to 12, wherein: The adhesive layer includes an acrylic polymer, and the acrylic polymer includes at least one of polymethyl methacrylate, polyethyl acrylate, and polybutyl acrylate.

14. The bonding assembly according to any one of claims 1 to 13, wherein: The thickness of the adhesive layer is 15 μm to 25 μm.

15. The bonding assembly according to any one of claims 1 to 14, wherein: The substrate includes at least one of polyethylene terephthalate, polypropylene, polycarbonate, and polyamide.

16. The bonding assembly according to any one of claims 1 to 15, wherein: The substrate has a thickness of 5 μm to 15 μm.

17. The bonding assembly according to any one of claims 1 to 16, wherein: The connecting member is connected to both sides of the main body member along its own thickness direction.

18. A battery comprising: Battery cells; The adhesive assembly according to any one of claims 1 to 17, connected to the battery cell, and the adhesive layer of the adhesive assembly is adhered to the surface of the battery cell.

19. The battery according to claim 18, wherein The battery cells are arranged in plurality, and the adhesive assembly is arranged between two adjacent battery cells.

20. The battery according to claim 18 or 19, wherein The battery cell includes two first surfaces opposite to each other and two second surfaces opposite to each other, the first surface connects the two second surfaces, and the area of ​​the first surface is larger than the area of ​​the second surface, the first surface is arranged opposite to the adhesive component, and the first surface is bonded to the adhesive layer.

21. An electrical device comprising the battery according to any one of claims 18 to 20.

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