Conductive adhesive, battery monomer, battery and electric device

Abstract

The utility model provides a conductive adhesive, a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The conductive adhesive comprises a substrate layer and a conductive layer. The conductive layer is located on at least one side of the substrate layer, and the conductive layer and the substrate layer are arranged in a stacked mode. The conductive layer comprises an adhesive and a conductive agent, and the conductive agent is dispersed in the adhesive. The substrate layer has a plurality of through holes, and the conductive layer covers the through holes.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a conductive adhesive, a battery cell, a battery, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Conductive adhesive is used in battery manufacturing to bond multiple components together, ensuring battery integrity. However, in some technologies, the bonding strength of conductive adhesive is insufficient; if two bonded components separate, it may affect battery reliability. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a conductive adhesive, a battery cell, a battery, and an electrical device to improve the adhesive strength of the conductive adhesive.

[0005] An embodiment of the first aspect of this application provides a conductive adhesive, which includes: a base layer having a plurality of through holes; a conductive layer located on at least one side of the base layer, the conductive layer being stacked with the base layer and covering the through holes; wherein the conductive layer includes an adhesive and a conductive agent, the conductive agent being dispersed within the adhesive.

[0006] In the technical solution of this application embodiment, multiple through holes are provided on the substrate layer, and the conductive layer covers the through holes, so that the conductive layer can pass through the through holes and contact the components on both sides of the substrate layer, and bond the components located on both sides of the substrate layer together, thereby increasing the contact area between the conductive layer and the components, and thus increasing the bonding strength of the conductive adhesive.

[0007] In some embodiments, the mass percentage of the conductive agent in the conductive layer is greater than or equal to 60% and less than or equal to 75%. If the mass percentage of the conductive agent in the conductive layer is too small, the conductivity between the conductive layer and the bonded components will decrease, which is detrimental to the electrical connection between the components. If the mass percentage of the conductive agent in the conductive layer is too large, there will be too little adhesive in the conductive layer, reducing the adhesive strength of the conductive layer. Setting the mass percentage of the conductive agent in the conductive layer to be greater than or equal to 60% and less than or equal to 75% enhances the conductivity between the bonded components and also improves the adhesive strength of the conductive layer.

[0008] In some embodiments, the base layer includes a metal, which enables the base layer to conduct electricity. The base layer provides a carrier for the conductive layer, stabilizes the colloidal shape of the conductive layer, and also improves the conductivity of the conductive adhesive.

[0009] In some embodiments, the shape of the through-hole includes at least one of circles and polygons. Circles and polygons are common shapes and relatively easy to manufacture.

[0010] In some embodiments, the thickness D1 of the substrate layer is greater than or equal to 2 μm and less than or equal to 4 μm. If the thickness D1 of the substrate layer is too small, the strength of the substrate layer is too low, and it cannot effectively provide a carrier for the conductive layer and stabilize the colloidal shape of the conductive layer; if the thickness D1 of the substrate layer is too large, the thickness of the conductive adhesive will increase, resulting in a larger space occupied by the conductive adhesive in the device. Setting the thickness D1 of the substrate layer to be greater than or equal to 2 μm and less than or equal to 4 μm improves the strength of the substrate layer on the one hand, and reduces the space occupied by the conductive adhesive in the device on the other hand.

[0011] In some embodiments, the thickness D2 of the conductive adhesive is greater than or equal to 5 μm and less than or equal to 6 μm. If the thickness D2 of the conductive adhesive is too small, it is difficult to manufacture, and the conductive layer in the conductive adhesive will also be reduced, affecting the adhesive strength and conductivity of the conductive adhesive. If the thickness D2 of the conductive adhesive is too large, the conductive adhesive occupies a large space in the device. Setting the thickness D2 of the conductive adhesive to be greater than or equal to 5 μm and less than or equal to 6 μm improves the adhesive strength and conductivity of the conductive adhesive, and also reduces the space occupied by the conductive adhesive in the device.

[0012] The second aspect of this application provides a single battery cell, which includes multiple first tabs and multiple second tabs, with the first tabs and second tabs having different polarities. The multiple first tabs are bonded together using conductive adhesive as described in any of the above embodiments, and / or the multiple second tabs are bonded together using conductive adhesive as described in any of the above embodiments. Bonding multiple first tabs or multiple second tabs together with conductive adhesive, compared to related technologies where tabs are connected by welding, reduces the number of welding operations during battery cell manufacturing, making battery cell manufacturing simpler. Furthermore, due to the large number of tabs, multiple welding operations can easily lead to incomplete or excessive welding. The battery cell provided in this application uses conductive adhesive to bond the tabs, reducing the occurrence of incomplete or excessive welding. Additionally, welding easily leads to weld slag, which, if left inside the battery cell, can easily puncture the separator, causing a short circuit and affecting the reliability of the battery cell. The battery cell provided in this application uses conductive adhesive to bond the tabs, reducing the occurrence of weld slag and improving the reliability of the battery cell.

[0013] In some embodiments, the base layer includes metal, the material of the first tab is the same as the material of the base layer to which the conductive adhesive of the first tab is bonded, and / or the material of the second tab is the same as the material of the base layer to which the conductive adhesive of the second tab is bonded, thereby improving the consistency of the battery cells.

[0014] An embodiment of the third aspect of this application provides a battery comprising the battery cells described in the above embodiments. The battery provided by this application embodiment can reduce the number of soldering operations during battery manufacturing, simplifying the manufacturing process, reducing over-soldering or incomplete soldering, reducing solder slag formation, and improving battery reliability.

[0015] In some embodiments, the battery further includes a first terminal and a second terminal. The first tabs of multiple battery cells are bonded together using conductive adhesive as described in any of the above embodiments, and the first terminal and the first tab of the battery cells are bonded together using conductive adhesive as described in any of the above embodiments. And / or the second tabs of multiple battery cells are bonded together using conductive adhesive as described in any of the above embodiments, and the second terminal and the second tab are bonded together using conductive adhesive as described in any of the above embodiments. Bonding the first terminal and the first tab of the battery cells with conductive adhesive, or bonding the second terminal and the second tab together with conductive adhesive, can reduce the use of adapter pieces in the battery, thereby reducing battery weight, reducing the volume occupied by adapter pieces, improving the battery's volumetric capacity and weight capacity, reducing the number of steps in manufacturing adapter pieces, simplifying the production process, and reducing battery production costs.

[0016] In some embodiments, the battery further includes a first terminal and a second terminal, and an adapter piece. The first tabs of multiple battery cells are connected via the adapter piece, and the adapter piece connected to the first tab is connected to the first terminal. And / or the second tabs of multiple battery cells are connected via the adapter piece, and the adapter piece connected to the second tab is connected to the second terminal. Connecting the tabs and terminals via the adapter piece allows the position and shape of the adapter piece to be adjusted according to the position of the terminal, without needing to change the position and shape of the tabs, making it more convenient.

[0017] An embodiment of the fourth aspect of this application provides an electrical device that includes the battery described in the above embodiments, the battery being used to provide electrical energy.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0020] Figure 1 A cross-sectional view of a conductive adhesive provided in an embodiment of this application;

[0021] Figure 2 A top view of a base layer provided in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0023] Figure 4 A discrete graph of the shear strength of a conductive adhesive provided for embodiments of this application;

[0024] Figure 5 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram illustrating the connection of multiple battery cells according to an embodiment of this application;

[0026] Figure 7 A cross-sectional schematic diagram of a battery provided for some embodiments of this application;

[0027] Figure 8 This is another schematic diagram showing the connection of multiple battery cells provided in an embodiment of this application;

[0028] Figure 9 The diagram shows the structure of a vehicle provided in some embodiments of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1000, Battery; 2000, Controller; 3000, Motor; 100, Conductive Adhesive; 200, Battery Cell; 300, First Terminal; 400, Second Terminal; 500, Adapter; 600, Housing; 700, End Cap; 800, Riveting Block; 900, Sealing Ring; 110, Lower Plastic; 120, First Insulating Film; 130, Second Insulating Film; 10, Base Layer; 11, Through Hole; 20, Conductive Layer; 21, Adhesive; 22, Conductive Agent; 30, First Tab; 40, Second Tab. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0037] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0040] Conductive adhesive is an adhesive that becomes conductive after curing or drying. It can connect various conductive components together, creating an electrical path between them. Conductive adhesive is frequently used in battery production; however, in related technologies, the adhesive strength of conductive adhesive is relatively low, which can cause the originally bonded components to separate, preventing electrical connection and affecting battery stability.

[0041] The conductive adhesive provided in this application can be used in the production of battery cells and batteries, and can also be widely used in the production and manufacturing of electric vehicles, construction engineering, aerospace and many other fields.

[0042] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and batteries disclosed in this application. This is beneficial for improving the bonding strength of the conductive adhesive, enhancing the stability of battery performance, and extending battery life.

[0043] This application provides a conductive adhesive. Figure 1This is a cross-sectional view of a conductive adhesive provided in an embodiment of this application. See also... Figure 1 The conductive adhesive 100 includes a base layer 10 and a conductive layer 20. The conductive layer 20 is located on at least one side of the base layer 10, and the conductive layer 20 is stacked with the base layer 10. The conductive layer 20 includes an adhesive 21 and a conductive agent 22, with the conductive agent 22 dispersed within the adhesive 21.

[0044] Figure 2 A top view of a base layer provided in an embodiment of this application. See also Figure 2 The substrate 10 has multiple vias 11. The conductive layer 20 covers the vias 11.

[0045] In the embodiments of this application, the substrate layer 10 provides a carrier for the conductive layer 20 and stabilizes the colloidal shape of the conductive layer 20.

[0046] In embodiments of this application, the conductive layer 20 can be used to connect multiple conductive components together, thereby forming an electrical path between the connected components. Exemplarily, the adhesive 21 is used to connect multiple conductive components together, and the conductive agent 22 forms an electrical path between the connected components.

[0047] In the embodiments of this application, the shape of the through hole 11 is not limited and can be set according to requirements.

[0048] In some embodiments of this application, if there are no vias 11 on the substrate 10, the area of ​​one layer of the substrate 10 is S1, and the total area of ​​the vias 11 is S2, wherein S2 / S1 is greater than or equal to 0.1 and less than or equal to 0.9. For example, S2 / S1 = 0.7.

[0049] In this application, a plurality of through holes 11 are provided on the substrate layer 10, and the conductive layer 20 covers the through holes 11, so that the conductive layer 20 can pass through the through holes 11 and contact the components on both sides of the substrate layer 10, thereby bonding the components on both sides of the substrate layer 10 together, increasing the contact area between the conductive layer 20 and the components, thereby increasing the bonding strength of the conductive adhesive 100.

[0050] In the embodiments of this application, the increased contact area between the conductive layer 20 and the component can increase the conductivity between the conductive layer 20 and the component, thereby increasing the conductivity between the electrically connected components.

[0051] In the embodiments of this application, through holes 11 are provided on the substrate 10, which reduces the amount of material used in the substrate 10 and saves raw materials.

[0052] In the embodiments of this application, the bonding strength of the conductive adhesive 100 is increased. Compared with related technologies, the amount of conductive adhesive 100 used can be reduced under the same bonding strength, thus reducing the use of conductive adhesive 100, lowering costs, and also reducing the overflow of the conductive adhesive 100 during heating.

[0053] According to some embodiments of this application, the mass percentage of conductive agent 22 in conductive layer 20 is greater than or equal to 60% and less than or equal to 75%.

[0054] In the embodiments of this application, the mass percentage of conductive agent 22 in conductive layer 20 can be determined based on the ratio of the mass of conductive agent 22 in conductive layer 20 to the total mass of conductive layer 20.

[0055] For example, the mass of the conductive agent 22 and the total mass of the conductive layer 20 can be determined according to the ratio of adhesive 21 and conductive agent 22 when making the conductive adhesive.

[0056] If the mass percentage of conductive agent 22 in conductive layer 20 is too small, the conductivity between conductive layer 20 and the bonded components will decrease, which is detrimental to the electrical connection between the components. If the mass percentage of conductive agent 22 in conductive layer 20 is too large, there will be too little adhesive in conductive layer 20, reducing the bonding strength of conductive layer 20. Setting the mass percentage of conductive agent 22 in conductive layer 20 to be greater than or equal to 60% and less than or equal to 75% enhances the conductivity between the bonded components and also improves the bonding strength of conductive layer 20.

[0057] According to some embodiments of this application, the base layer 10 includes metal.

[0058] In the embodiments of this application, the base layer 10 is metal, which makes the base layer 10 conductive. The base layer 10 provides a carrier for the conductive layer 20, stabilizes the colloidal shape of the conductive layer 20, and can also improve the conductivity of the conductive adhesive 100.

[0059] According to some embodiments of this application, the substrate 10 includes at least one of copper, aluminum, and nickel.

[0060] For example, the substrate 10 may include one of copper, aluminum and nickel, or a mixture of any two of them, or the substrate 10 may include copper, aluminum and nickel simultaneously.

[0061] In embodiments of this application, the substrate layer 10 may include at least one of copper, aluminum and nickel, or other metallic materials.

[0062] Copper, aluminum, and nickel are all common metallic materials with low resistance, which can further improve the conductivity of conductive adhesive 100.

[0063] According to some embodiments of this application, adhesive 21 includes at least one selected from epoxy resin, phenolic resin, polyurethane, silicone resin and acrylate.

[0064] For example, the adhesive 21 may include one, a mixture of any two, a mixture of any three, a mixture of any four, or a mixture of any five of the following: epoxy resin, phenolic resin, polyurethane, silicone resin, and acrylate; or the base layer 10 may include all five of the above materials.

[0065] In the embodiments of this application, the base layer 10 may include other adhesive materials in addition to the five materials mentioned above.

[0066] Epoxy resin, phenolic resin, polyurethane, silicone resin and acrylate are all common adhesive materials with high bonding strength, which can further improve the bonding strength of conductive adhesive 100.

[0067] According to some embodiments of this application, the conductive agent 22 includes at least one of silver-coated copper powder, silver-coated aluminum powder, silver-coated nickel powder, silver-coated glass powder, and nickel-coated graphite powder.

[0068] For example, the conductive agent 22 may include one, a mixture of any two, a mixture of any three, a mixture of any four, or a mixture of any five of the following: silver-coated copper powder, silver-coated aluminum powder, silver-coated nickel powder, silver-coated glass powder, and nickel-coated graphite powder; or the conductive agent 22 may include all five of the above materials.

[0069] In the embodiments of this application, the conductive agent 22 may include other conductive materials in addition to the five materials mentioned above.

[0070] Silver-coated copper powder, silver-coated aluminum powder, silver-coated nickel powder, silver-coated glass powder, and nickel-coated graphite powder are all common conductive materials with good conductivity, which can further improve the conductivity of conductive adhesive 100.

[0071] According to some embodiments of this application, the shape of the through hole 11 includes at least one of a circle and a polygon.

[0072] exist Figure 2 In this embodiment, the through hole 11 is circular. In other embodiments, the through hole 11 can be other shapes, such as triangles, quadrilaterals, pentagons, hexagons, or any other polygon.

[0073] exist Figure 2 In this embodiment, the through hole 11 is always circular. In other embodiments, the shape of the through hole 11 can be any combination of two or more shapes.

[0074] Circles and polygons are common shapes and relatively easy to create.

[0075] According to some embodiments of this application, the thickness D1 of the substrate 10 is greater than or equal to 2 μm and less than or equal to 4 μm.

[0076] If the thickness D1 of the substrate layer 10 is too small, the strength of the substrate layer 10 will be too low, and it will not be able to provide a carrier for the conductive layer 20 to stabilize the colloidal shape of the conductive layer 20. If the thickness D1 of the substrate layer 10 is too large, the substrate layer 10 will increase the thickness of the conductive adhesive 100, resulting in a larger space occupied by the conductive adhesive 100 in the device. Setting the thickness D1 of the substrate layer 10 to be greater than or equal to 2μm and less than or equal to 4μm can improve the strength of the substrate layer 10 on the one hand, and reduce the space occupied by the conductive adhesive 100 in the device on the other hand.

[0077] According to some embodiments of this application, the thickness D2 of the conductive adhesive 100 is greater than or equal to 5 μm and less than or equal to 6 μm.

[0078] If the thickness D2 of the conductive adhesive 100 is too small, it will be difficult to manufacture, and the conductive layer in the conductive adhesive 100 will also be reduced, affecting the adhesive strength and conductivity of the conductive adhesive 100. If the thickness D2 of the conductive adhesive 100 is too large, it will occupy a large space in the device. Setting the thickness D2 of the conductive adhesive 100 to be greater than or equal to 5μm and less than or equal to 6μm can improve the adhesive strength and conductivity of the conductive adhesive 100, and also reduce the space occupied by the conductive adhesive 100 in the device.

[0079] Embodiments of this application provide a single battery cell. Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application. See also... Figure 3 The battery cell 200 includes multiple first tabs 30 and multiple second tabs 40, with the first tabs 30 and the second tabs 40 having different polarities. The multiple first tabs 30 are bonded together by conductive adhesive 100, and / or the multiple second tabs 40 are bonded together by conductive adhesive 100.

[0080] Figure 3 In the battery cell 200 shown, multiple first tabs 30 are stacked together, and multiple second tabs 40 are also stacked together, so from Figure 3 Only one first electrode 30 and one second electrode 40 are shown in the diagram.

[0081] The battery cell 200 includes a cap, a casing, electrode assemblies, and other functional components. An end cap is a component that closes onto the opening of the casing to isolate the internal environment of the battery cell 200 from the external environment. Electrode assemblies are the components within the battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies. Electrode assemblies are mainly formed by winding or stacking positive and negative electrode plates, and a separator is typically provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body.

[0082] For example, the first electrode 30 can be a positive electrode and the second electrode 40 can be a negative electrode; or the first electrode 30 can be a negative electrode and the second electrode 40 can be a positive electrode.

[0083] In the embodiments of this application, one type of electrode tab 30 and one type of electrode tab 40 may be bonded together with conductive adhesive 100, or one type of first electrode tab 30 may be bonded together with conductive adhesive 100 and one type of second electrode tab 40 may be bonded together with conductive adhesive 100.

[0084] In the embodiments of this application, multiple first tabs 30 are bonded together with conductive adhesive 100, or multiple second tabs 40 are bonded together with conductive adhesive 100. Compared to related technologies where tabs are connected by welding, the battery cell provided in this application can reduce the number of welding operations during the battery cell manufacturing process, making the battery cell manufacturing process simpler. Furthermore, due to the large number of tabs, multiple welding operations can easily lead to incomplete or excessive welding. The battery cell provided in this application uses conductive adhesive 100 to bond the tabs, reducing the occurrence of incomplete or excessive welding. Additionally, welding can easily lead to weld slag. Weld slag remaining inside the battery cell 200 can easily puncture the separator, causing a short circuit in the battery cell 200 and affecting its reliability. The battery cell provided in this application uses conductive adhesive 100 to bond the tabs, reducing the occurrence of weld slag and improving the reliability of the battery cell.

[0085] During the welding process, the resulting solder marks have high ohmic impedance, which affects the output efficiency of the battery cell. In the battery cell provided in this application embodiment, multiple first tabs 30 are bonded together with conductive adhesive 100, or multiple second tabs 40 are bonded together with conductive adhesive 100, which reduces welding, thereby reducing solder marks and improving the output efficiency of the battery cell.

[0086] According to some embodiments of this application, the base layer 10 includes metal, the material of the first tab 30 is the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the first tab 30, and / or the material of the second tab 40 is the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the second tab 40.

[0087] In embodiments of this application, the substrate 10 includes at least one of copper, aluminum, and nickel.

[0088] For example, if the first tab 30 is a positive tab and the second tab 40 is a negative tab, then the base layer 10 of the conductive adhesive 100 that bonds the first tab 30 is made of aluminum, and the base layer 10 of the conductive adhesive 100 that bonds the second tab 40 can be made of copper or nickel.

[0089] In the embodiments of this application, when the first electrode 30 is bonded with conductive adhesive 100, but the plurality of second electrodes 40 are not bonded with conductive adhesive 100, then the material of the first electrode 30 is the same as the material of the base layer 10 of the conductive adhesive 100 bonded to the first electrode 30; when the first electrode 30 is not bonded with conductive adhesive 100, but the plurality of second electrodes 40 are bonded with conductive adhesive 100, then the material of the second electrodes 40 is the same as the material of the base layer 10 of the conductive adhesive 100 bonded to the second electrodes 40; when the first electrode 30 is bonded with conductive adhesive 100, and the plurality of second electrodes 40 are also bonded with conductive adhesive 100, the material of the first electrode 30 can be the same as the material of the base layer 10 of the conductive adhesive 100 bonded to the second electrodes 40. The base layer 10 of the conductive adhesive 100 that bonds the first tab 30 is made of the same material, but the material of the second tab 40 is different from the material of the base layer 10 of the conductive adhesive 100 that bonds the second tab 40. Alternatively, the material of the first tab 30 may be different from the material of the base layer 10 of the conductive adhesive 100 that bonds the first tab 30, but the material of the second tab 40 may be the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the second tab 40. Or, the material of the first tab 30 may be the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the first tab 30, and the material of the second tab 40 may be the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the second tab 40.

[0090] In the battery cell provided in the embodiments of this application, the material of the first tab 30 is the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the first tab 30, or the material of the second tab 40 is the same as the material of the base layer 10 of the conductive adhesive 100 that bonds the second tab 40, so that the consistency of the battery cell is better.

[0091] In the embodiments of this application, the conductive adhesive is used to bond the electrode tabs and generally does not come into contact with the electrolyte in the battery cell, thus having little impact on the shear strength of the conductive adhesive. Even if the conductive adhesive comes into contact with the electrolyte in the battery cell, the electrolyte has little impact on the shear strength of the conductive adhesive. Figure 4A discrete graph of the shear strength of a conductive adhesive provided for embodiments of this application. Figure 4 In the graph, the vertical axis represents shear strength in megapascals (MPa), and the horizontal axis represents the amount of conductive adhesive. For example, a point in the graph corresponds to an horizontal axis of 2 and a vertical axis of 15.5, indicating that the average shear strength of two conductive adhesives is 15.5 MPa. Figure 4 It can be seen that after the conductive adhesive is soaked in an electrolyte at 60 degrees Celsius (°C) for 48 hours, its shear strength does not decrease much and remains above 10 MPa.

[0092] An embodiment of this application provides a battery. Figure 5 This is a schematic diagram of a battery structure provided in an embodiment of this application. See also... Figure 5 Battery 1000 includes 200 individual battery cells.

[0093] The battery 1000 includes a housing 600, an end cap 700, and a battery cell 200. The end cap 700 is a component that covers the opening of the housing 600 to isolate the internal environment of the battery cell 200 from the external environment. The shape of the end cap 700 can be adapted to the shape of the housing 600 to fit it. Optionally, the end cap 700 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 700 is less prone to deformation under pressure and impact, allowing the battery cell 200 to have higher structural strength and improved safety performance. Functional components such as terminals can be provided on the end cap 700. The terminals can be used to electrically connect to the battery cell 200 for outputting or inputting electrical energy into the battery cell 200. In some embodiments, the end cap 700 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold. The end cap 700 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating element may be provided on the inner side of the end cap 700. The insulating element can be used to isolate the electrical connection components within the housing 600 from the end cap 700 to reduce the risk of short circuits. For example, the insulating element can be plastic, rubber, etc.

[0094] The outer casing 600 is a component used to cooperate with the end cap 700 to form the internal environment of the battery cell 200. This internal environment can accommodate the battery cell 200, electrolyte, and other components. The outer casing 600 and the end cap 700 can be independent components. An opening can be provided on the outer casing 600, and the end cap 700 closes the opening to form the internal environment of the battery cell 200. Alternatively, the end cap 700 and the outer casing 600 can be integrated. Specifically, the end cap 700 and the outer casing 600 can form a common connecting surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the outer casing 600, the end cap 700 closes the outer casing 600. The outer casing 600 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer casing 600 can be determined according to the specific shape and size of the battery cell 200. The outer casing 600 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0095] In battery 1000, there can be multiple battery cells 200, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 200 are connected in both series and parallel. Multiple battery cells 200 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 200 is housed within the casing 600. Alternatively, battery 1000 can also consist of multiple battery cells 200 first connected in series, parallel, or in a mixed configuration to form a battery module, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the casing 600. Battery 1000 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 200. Each battery cell 200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Battery cells 200 can be cylindrical, flat, cuboid, or other shapes.

[0096] The battery 1000 provided in this application embodiment can reduce the number of welding operations during battery manufacturing, making the battery manufacturing process simpler, reducing over-welding or incomplete welding, reducing the occurrence of welding slag, and improving battery reliability.

[0097] According to some embodiments of this application, see Figure 5 The battery 1000 also includes a first terminal 300 and a second terminal 400.

[0098] Figure 6 This is a schematic diagram illustrating the connection of multiple battery cells according to an embodiment of this application. See also... Figure 6 The first tabs 30 of multiple battery cells 200 are bonded together by conductive adhesive 100, and the first terminal posts 300 ( Figure 6(Not shown) and the first tab 30 of the battery cell 200 are bonded together by conductive adhesive 100, and / or the second tabs 40 of multiple battery cells 200 are bonded together by conductive adhesive 100, and the second terminal 400 ( Figure 6 (Not shown) and the second electrode 40 are bonded together with conductive adhesive 100.

[0099] in Figure 6 The two battery cells shown are 200

[0100] In the embodiments of this application, the first terminal post 300 and the first tab 30 of the battery cell 200 are bonded together with conductive adhesive 100, or the second terminal post 400 and the second tab 40 are bonded together with conductive adhesive 100. This can reduce the use of adapter pieces in the battery, thereby reducing the battery weight, reducing the volume occupied by the adapter pieces, improving the volumetric capacity and weight capacity of the battery, reducing the number of steps in manufacturing the adapter pieces, simplifying the production process, and reducing the battery production cost.

[0101] Figure 7 This is a schematic cross-sectional view of a battery provided for some embodiments of this application. See also... Figure 7 The first tabs 30 of both battery cells 200 are connected to the first terminals 300 via conductive adhesive 100. The first terminals 300 pass through a through hole in the end cap 700 and are connected to the riveting block 800. The electrical energy of the battery cell 200 is transmitted outward sequentially through the first tabs 30, the first terminals 300, and the riveting block 800. A sealing ring 900 is located between the end cap 700 and the first terminals 300, insulating the first terminals 300 from the end cap 700. A lower plastic 110 is located between the end cap 700 and the riveting block 800, insulating the riveting block 800 from the end cap 700. The lower plastic 110 can be connected to the end cap 700 by heat fusion.

[0102] See Figure 7 The battery also includes a first insulating film 120, which wraps around the battery casing 600, insulating the battery casing 600 from the outside world and reducing scratches on the casing 600.

[0103] See Figure 7 The battery also includes a second insulating film 130, which wraps around the battery cell and insulates the battery cell from the battery casing 600, while also reducing scratches on the battery cell during assembly.

[0104] For example, both the first insulating film 120 and the second insulating film 130 can be polyester film (Mylar).

[0105] According to some embodiments of this application, the battery further includes a first terminal 300 and a second terminal 400. Figure 8This is another schematic diagram showing the connection of multiple battery cells provided in an embodiment of this application. See also... Figure 8 The battery also includes an adapter plate 500, through which the first tabs 30 of multiple battery cells are connected, and the adapter plate 500 connected to the first tabs 30 is connected to the first terminal post 300, and / or the second tabs 40 of multiple battery cells are connected through the adapter plate 500, and the adapter plate 500 connected to the second tabs 40 is connected to the second terminal post 400.

[0106] In the embodiments of this application, the first tab 30 and the adapter piece 500 can be connected by conductive adhesive 100, the adapter piece 500 and the first pole piece 300 can also be connected by conductive adhesive 100, the second tab 40 and the adapter piece 500 can be connected by conductive adhesive 100, and the adapter piece 500 and the second pole piece 400 can also be connected by conductive adhesive 100.

[0107] In the embodiments of this application, the adapter piece 500 connecting the first tab 30 and the first pole post 300 is a different adapter piece from the adapter piece 500 connecting the first tab 30 and the first pole post 300. That is, the first tab 30 and the second tab 40 are not electrically connected through the adapter piece 500.

[0108] In the embodiments of this application, the tab and the pole are connected by an adapter piece. The position and shape of the adapter piece can be adjusted according to the position of the pole, without having to change the position and shape of the tab, which is more convenient.

[0109] Embodiments of this application also provide an electrical device, which includes a battery for providing electrical energy.

[0110] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0111] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0112] Please refer to Figure 9 , Figure 9This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 1000 is installed inside the vehicle, and the battery 1000 can be located at the bottom, front, or rear of the vehicle. The battery 1000 can be used to power the vehicle; for example, the battery 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 controls the battery 1000 to supply power to the motor 3000, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0113] In some embodiments of this application, the battery 1000 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0114] Embodiments of this application provide a conductive adhesive 100 comprising a substrate layer 10 and a conductive layer 20. The conductive layer 20 is located on at least one side of the substrate layer 10, and the conductive layer 20 is stacked with the substrate layer 10. The conductive layer 20 comprises an adhesive 21 and a conductive agent 22, the conductive agent 22 being dispersed within the adhesive 21. The conductive agent 22 has a mass percentage in the conductive layer 20 greater than or equal to 60% and less than or equal to 75%. The substrate layer 10 comprises at least one of copper, aluminum, and nickel. The adhesive 21 comprises at least one of epoxy resin, phenolic resin, polyurethane, silicone resin, and acrylate. The conductive agent 22 comprises at least one of silver-coated copper powder, silver-coated aluminum powder, silver-coated nickel powder, silver-coated glass powder, and nickel-coated graphite powder. The shape of the through-hole 11 comprises at least one of circular and polygonal shapes. The thickness D1 of the substrate layer 10 is greater than or equal to 2 μm and less than or equal to 4 μm. The thickness D2 of the conductive adhesive 100 is greater than or equal to 5 μm and less than or equal to 6 μm.

[0115] Embodiments of this application provide a method for preparing a conductive adhesive, the method comprising:

[0116] Step S101: Heat the solid epoxy resin until it is melted and no small bubbles are visible, then add the liquid epoxy resin and heat and stir to mix evenly.

[0117] In step S102, dicyandiamide micro powder and a trace amount of silane coupling agent are added, followed by a small amount of inorganic filler, and finally conductive powder is added. The conductive powder accounts for 60-75% of the total mass. After magnetic stirring and mixing, a conductive material is obtained.

[0118] In step S103, the prepared conductive material is kept at a constant temperature of 60°C for a period of time, and then slowly poured onto a smooth, flat, and porous metal substrate. A PET film is then wrapped around both the metal substrate and the conductive material. A film is formed by pressing the film at 60°C using a laminating machine with adjustable thickness, thus obtaining a conductive adhesive using a metal substrate as a carrier. The PET film is then removed, and the conductive adhesive is cut to the appropriate size for bonding to tabs and posts.

[0119] In one implementation of this application, the method for preparing the conductive adhesive may further include:

[0120] Weigh 100 parts of solid bisphenol A epoxy resin and heat until melted and free of small bubbles. Add 80 parts of liquid bisphenol A epoxy resin and 20 parts of isocyanate-modified epoxy resin, ensuring rapid addition. After heating and stirring until homogeneous, add 10 parts of dicyandiamide micropowder and a trace amount of silane coupling agent, followed by a small amount of inorganic filler. Finally, add conductive powder, with the conductive powder comprising 60-75% of the conductive adhesive by mass. Magnetic stirring until homogeneous yields the conductive material. Maintain the prepared conductive material at 60°C for a period of time, then slowly pour it onto a smooth, porous metal substrate. Coat both the metal substrate and the conductive adhesive with a PET film. Use a laminator with adjustable thickness to press the film at 60°C, thus obtaining a conductive adhesive using a metal substrate as a carrier. Remove the PET film and cut the conductive adhesive to the appropriate size for bonding to tabs and posts.

[0121] In another implementation of this application, the method for preparing the conductive adhesive may further include:

[0122] Add 30 parts of tetrafunctional epoxy resin, 15 parts of trifunctional epoxy resin, and 25 parts of thermoplastic resin toughening agent to a mixing device. Heat to 120℃ and stir for 60 minutes to fully dissolve and homogenize the thermoplastic resin toughening agent. Add 20 parts of bisphenol S epoxy resin, 30 parts of polyurethane modified epoxy resin, 6 parts of thixotropic agent, and 3 parts of silane coupling agent. Stir at 100℃ for 30 minutes. After cooling to 70℃, add 12 parts of dicyandiamide / imidazolium metal salt curing agent system and stir for 2 minutes. After mixing for 0 minutes to ensure uniformity, conductive powder is added. The mass percentage of conductive powder in the conductive adhesive is 60-75%. The mixture is then magnetically stirred until homogeneous to obtain the conductive material. The prepared conductive material is kept at 60°C for a period of time, and then slowly poured onto a smooth, porous metal substrate. Both the metal substrate and the conductive adhesive are coated with a PET film. A film is then formed using a thickness-adjustable laminating machine at 60°C, resulting in an ultra-thin conductive adhesive using a metal substrate as a carrier. The PET film is removed, and the conductive adhesive is cut to the appropriate size for bonding to tabs and posts.

[0123] In another implementation of this application, the method for preparing the conductive adhesive may further include:

[0124] 30 parts of trifunctional epoxy resin and 20 parts of core-shell elastic microsphere toughening agent were added to a mixing device. The mixture was heated to 120℃ and stirred for 60 minutes to fully dissolve the toughening agent and mix evenly. 15 parts of phenolic epoxy resin, 35 parts of rubber elastomer modified epoxy resin, 5 parts of thixotropic agent, and 3 parts of silane coupling agent were added. The mixture was stirred at 100℃ for 30 minutes. After cooling to 70℃, 10 parts of dicyandiamide / imidazolium metal salt curing agent system were added. The mixture was stirred for 20 minutes to mix evenly. Finally, conductive powder was added, with a mass percentage of 60-75% in the conductive adhesive. After magnetic stirring and mixing evenly, a conductive material was obtained. The prepared conductive material was kept at 60℃ for a period of time and then slowly poured onto a smooth, flat, and porous metal substrate. The metal substrate and the outer layer of the conductive adhesive were each coated with a PET film. The film was pressed into shape at 60℃ using a film-forming machine with adjustable thickness, thus obtaining an ultra-thin conductive adhesive using a metal substrate as a carrier. Remove the PET film, cut the conductive adhesive to the appropriate size, and then attach it to the tabs and posts.

[0125] An embodiment of this application provides a battery cell 200, which includes a plurality of first tabs 30 and a plurality of second tabs 40, wherein the first tabs 30 and the second tabs 40 have different polarities. The plurality of first tabs 30 and the plurality of second tabs 40 are bonded together by conductive adhesive 100. The material of the first tabs 30 is the same as the material of the base layer 10 of the conductive adhesive 100 bonded to the first tabs 30, and the material of the second tabs 40 is the same as the material of the base layer 10 of the conductive adhesive 100 bonded to the second tabs 40.

[0126] An embodiment of this application provides a battery 1000, which includes a battery cell 200, a first terminal 300, and a second terminal 400. The first tabs 30 of multiple battery cells 200 are bonded together by conductive adhesive 100, and the first terminal 300 and the first tab 30 of the battery cell 200 are bonded together by conductive adhesive 100. The second tabs 40 of multiple battery cells 200 are bonded together by conductive adhesive 100, and the second terminal 400 and the second tab 40 are bonded together by conductive adhesive 100.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrically conductive adhesive, characterized in that, The conductive adhesive (100) comprises: a substrate layer (10) having a plurality of through holes (11); a conductive layer (20) located on at least one side of the substrate layer (10), the conductive layer (20) being laminated with the substrate layer (10), and the conductive layer (20) covering the through holes (11); wherein the conductive layer (20) comprises an adhesive (21) and a conductive agent (22), and the conductive agent (22) is dispersed in the adhesive (21).

2. The electrically conductive adhesive of claim 1, wherein The substrate layer (10) comprises metal.

3. The electroconductive paste according to claim 1 or 2, wherein The shape of the through hole (11) comprises at least one of a circle and a polygon.

4. The electroconductive paste according to claim 1 or 2, wherein The thickness D1 of the substrate layer (10) is greater than or equal to 2 μm and less than or equal to 4 μm.

5. The electrically conductive adhesive according to claim 1 or 2, wherein The thickness D2 of the conductive adhesive (100) is greater than or equal to 5 μm and less than or equal to 6 μm.

6. A battery cell characterized by, The battery cell (200) comprises a plurality of first tabs (30) and a plurality of second tabs (40), and the conductive adhesive (100) according to any one of claims 1 to 5, the first tabs (30) and the second tabs (40) being different in polarity; A plurality of the first tabs (30) are bonded by the conductive adhesive (100), and / or a plurality of the second tabs (40) are bonded by the conductive adhesive (100).

7. The battery cell of claim 6, wherein, The substrate layer (10) comprises metal, the material of the first tab (30) is the same as the material of the substrate layer (10) of the conductive adhesive (100) bonding the first tab (30), and / or the material of the second tab (40) is the same as the material of the substrate layer (10) of the conductive adhesive (100) bonding the second tab (40).

8. A battery, characterized by The battery comprises the battery cell (200) according to claim 6 or 7.

9. The battery of claim 8, wherein, The battery further comprises a first pole (300) and a second pole (400), a plurality of the first tabs (30) of the battery cell (200) are bonded by the conductive adhesive (100), and the first pole (300) and the first tab (30) of the battery cell (200) are bonded by the conductive adhesive (100), and / or a plurality of the second tabs (40) of the battery cell (200) are bonded by the conductive adhesive (100), and the second pole (400) and the second tab (40) are bonded by the conductive adhesive (100).

10. The battery of claim 8, wherein, The battery further comprises a first pole (300) and a second pole (400), and the battery further comprises a conversion sheet (500), a plurality of the first tabs (30) of the battery cell are connected by the conversion sheet (500), and the conversion sheet (500) connected with the first tab (30) is connected with the first pole (300), and / or a plurality of the second tabs (40) of the battery cell are connected by the conversion sheet (500), and the conversion sheet (500) connected with the second tab (40) is connected with the second pole (400).

11. An electrical device, characterized by The electric device comprises the battery according to any one of claims 8 to 10, and the battery is used to provide electric energy.

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