Battery device and electric equipment

Abstract

The invention provides a battery device and electric equipment. The battery device comprises a first element, a second element, a substrate and a structural adhesive. The substrate comprises a buffer layer, is provided with a plurality of through holes, is arranged between the first element and the second element, and is attached to the first element and the second element. The structural adhesive is filled in at least part of the through holes, and the structural adhesive is used for fixedly connecting the first element and the second element. A substrate comprising a plurality of through holes is arranged between a first element and a second element, and at least part of the through holes are filled with structural adhesive, so that the first element and the second element are fixedly connected through the structural adhesive filled in the through holes. According to the technical scheme, the filling amount, the bonding position and the bonding strength of the structural adhesive are accurately controlled through the through holes of the substrate, so that the use amount of the structural adhesive is reasonably controlled, and the problem of adhesive overflow is effectively solved; when side collision occurs, pulling-out force borne by other elements connected with the first element or the second element can be reduced through the buffer layer of the substrate.

Description

Technical Field

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

[0002] When different components in a battery device need to be fixedly connected, they can be bonded using structural adhesive. However, in related technologies, problems such as adhesive overflow and excessive adhesive application may occur when bonding two components with structural adhesive.

[0003] The above statements are for the purpose of providing background information in relation to this application only, and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of this application is to provide a battery device and an electrical device that aims to solve the problems of excess adhesive and excessive adhesive amount when different components in the battery device are bonded together with structural adhesive.

[0005] The first aspect provides a battery device comprising: a first element; a second element; a substrate including a buffer layer, the substrate having a plurality of through holes disposed between and abutting the first element and the second element; and a structural adhesive filling at least a portion of the plurality of through holes and configured to securely connect the first element and the second element.

[0006] In a battery device, a substrate comprising multiple through-holes is provided between a first element and a second element. At least a portion of the through-holes are filled with structural adhesive, thereby fixing the first and second elements together using the structural adhesive within the through-holes. Since the amount and location of the structural adhesive can be controlled by the number and size of the through-holes in the substrate, and the through-holes filled with the structural adhesive can be selected according to the bonding position and requirements of the first and second elements, it is beneficial to precisely control the amount of structural adhesive used, the bonding position, and the bonding strength. This allows for reasonable control of the amount of structural adhesive used and effectively solves the problem of adhesive overflow. The substrate includes a buffer layer that absorbs the relative displacement of the first and second elements during lateral collisions, thereby reducing the pull-out force on other elements connected to the first or second element.

[0007] In some embodiments, at least one of the through holes is circular, elliptical, polygonal, or has multiple protruding branches.

[0008] The shape of the through-hole can be set according to the shape of the first or second element, the bonding strength requirements between the first and second elements, etc. Circular and elliptical through-holes have smooth inner wall surfaces, facilitating uniform filling of the structural adhesive within the through-hole. Elliptical through-holes, extending along a specific direction, help improve the connection strength between the first and second elements in that direction. Polygonal through-holes allow for different shapes and distributions to be customized. For example, the dimensional differences in different directions of polygonal through-holes, such as those in rectangular through-holes, can be used to achieve different connection strengths between the first and second elements in different directions. Furthermore, the shapes of polygonal through-holes, such as triangular or hexagonal through-holes, can be used to create a denser arrangement of through-holes, thereby increasing the contact area between the structural adhesive and the first and second elements. Through-holes with multiple protruding branches help distribute the bonding force of the structural adhesive to the first and second elements in multiple directions, providing stronger bonding force in the branch directions. Examples of through-holes with multiple protruding branches include polygonal stars, crosses, and flower shapes. Multiple branches can be centrally symmetrical, or at least some branches can be of different lengths. The above is only an illustrative example of the shape of the through hole; in other embodiments of this application, the through hole can be set to other shapes.

[0009] In some embodiments, at least a portion of the vias are arrayed on the substrate.

[0010] Having at least some of the through holes arranged in an array on the substrate helps to evenly and regularly distribute the connection force between the first and second elements to multiple points through the structural adhesive placed in the through holes, which helps to reduce stress concentration that could cause the structural adhesive to crack or delaminate. It also facilitates precise control of the adhesive application device, application location, and amount.

[0011] In some embodiments, at least one of the shapes and areas of at least two of the through holes is the same; and / or at least one of the shapes and areas of at least two of the through holes is different.

[0012] At least two through holes have the same shape and area, forming a group of through holes with the same shape and / or area. This facilitates the through hole processing of the substrate and also helps to evenly distribute the bonding force required by the structural adhesive in the through holes to multiple locations to reduce stress concentration.

[0013] Having at least two through holes with different shapes or areas allows for the selection of through holes of different shapes and / or areas based on the connection positions of the first and second components. This also facilitates precise control of the amount of structural adhesive used at different locations according to connection requirements. For example, larger through holes can be used in high-load areas, smaller through holes in low-load areas, circular, regular polygonal, or other centrally symmetrical through holes can be used in areas with uniform loads, and elliptical, strip-shaped, or other non-centrally symmetrical through holes can be used in areas with dissimilar loads.

[0014] In some embodiments, the plurality of through holes are divided into a plurality of through hole groups, each of the through hole groups being arranged in different regions of the substrate, wherein the shape, area and / or distribution of the through holes in at least two of the through hole groups are different.

[0015] Multiple through holes are divided into multiple through hole groups, and each through hole group is arranged in different areas of the substrate. The shape, area and / or distribution of the through holes in different through hole groups are different, which is beneficial to set through holes for different areas of the adhesive area of ​​the first element and the second element to cope with stresses of different directions and sizes. For example, a larger through hole is set in the position where stronger adhesive force is required to cope with the higher shear force and tensile force that may be subjected to between the first element and the second element.

[0016] In some embodiments, the substrate is at least partially deformable; and / or the substrate is strip-shaped; and / or the substrate includes an adhesive layer located on at least one side surface.

[0017] The substrate is at least partially deformable, which facilitates the substrate to be set along a non-linear path, so that the non-planar first element and the second element can also be bonded by structural adhesive in the form of substrate assembly within the through holes of the substrate.

[0018] The substrate is strip-shaped, which allows one substrate to cover a long connection area of ​​the first or second element, further reducing the number of installation steps.

[0019] The substrate includes an adhesive layer on at least one surface, which facilitates the initial fixation of the substrate to the first or second element via adhesive bonding, followed by subsequent application of structural adhesive within the through-holes and assembly steps. This simplifies the fixing and connection process between the substrate and the first and second elements. When adhesive is applied to both sides of the substrate, in addition to limiting the amount and location of the structural adhesive, the substrate also provides auxiliary fixing and connection for the first and second elements.

[0020] In some embodiments, a first element and a plurality of second elements located on the same side of the first element are fixedly connected by structural adhesive within one or more through-holes in the substrate.

[0021] By fixing multiple second elements to one side of the same first element through one or more substrates, it is beneficial to improve the operation of connecting the same first element and multiple second elements, thereby improving the assembly efficiency of the battery device.

[0022] In some embodiments, the substrate is strip-shaped, and multiple substrates are arranged side by side at intervals.

[0023] An array of strip-shaped substrates is arranged between the first element and the second element. The strip-shaped substrates are easy to process and can be arranged as needed. For example, when there is the same first element and multiple second elements, the substrates only need to be arranged between the second element and the first element. In this case, multiple strip-shaped substrates are arranged side by side with intervals, which can reduce the area of ​​the substrates that are ineffectively covering the first element.

[0024] In some embodiments, the depth of the through hole does not exceed 2 mm.

[0025] The depth of the through holes in the substrate is within 2mm, which facilitates the filling of structural adhesive and forms effective bonding. Furthermore, the amount of structural adhesive can be accurately calculated based on the area of ​​the through holes, which helps to reduce the amount of adhesive and prevent adhesive overflow while ensuring the connection strength and reliability of the substrate.

[0026] In some embodiments, the substrate includes an adhesive layer disposed on at least one surface of the buffer layer.

[0027] The substrate includes an adhesive layer disposed on at least one side of the buffer layer, which facilitates the substrate to be first fixedly installed to the first or second element by adhesive bonding, followed by subsequent application of structural adhesive and assembly steps in the through-hole. Therefore, it simplifies the fixing and connection process between the substrate and the first and second elements. When the substrate is coated with adhesive on both sides, in addition to limiting the amount and position of the structural adhesive, the substrate also plays an auxiliary role in fixing and connecting the first and second elements. The buffer layer can absorb the relative displacement when the first and second elements collide sideways, thereby reducing the pull-out force on other elements connected to the first or second element. Furthermore, when the substrate includes an adhesive layer disposed on at least one side of the buffer layer, it has good deformation capacity, which is beneficial for the substrate to be set along a non-linear path. This allows the non-planar first and second elements to be bonded by using structural adhesive in the through-hole of the substrate.

[0028] In some embodiments, the buffer layer includes a polypropylene layer, a polycarbonate layer, or a polyethylene terephthalate layer.

[0029] The buffer layer includes a polypropylene layer, a polycarbonate layer, or a polyethylene terephthalate layer. The polypropylene layer, polycarbonate layer, or polyethylene terephthalate layer has excellent mechanical strength, temperature resistance, and anti-aging properties, which meet the strict requirements of modern industry for green environmental protection. It has sufficient deformation capacity and a suitable compression ratio, which helps the structural adhesive in the through hole to bond the first and second components.

[0030] In some embodiments, the first element includes a first protrusion facing the side of the second element, and the substrate is disposed between the first protrusion and the second element; and / or the second element includes a second protrusion facing the side of the first element, and the substrate is disposed between the first element and the second protrusion.

[0031] The first element includes a first protrusion facing the second element and / or the second element includes a second protrusion facing the first element. This facilitates the connection of the first element and the second element by applying pressure to the structural adhesive within the substrate and its through-holes. This ensures that the substrate (if it has an adhesive layer or a thin structural adhesive layer on its surface due to a continuous coating process) and the structural adhesive within its through-holes can make full contact with the corresponding protrusions or elements, thereby improving the connection reliability of the first element and the second element. It also facilitates the provision of mounting space for other components of the battery device, such as flexible circuit boards and temperature sensing elements, within the space formed by adjacent protrusions. Furthermore, the first protrusion and / or the second protrusion also help to improve the structural strength of the first element and / or the second element.

[0032] In some embodiments, the battery device further includes battery cells; the first element includes a protective plate; the second element includes an electrical connector configured to electrically connect different battery cells and disposed between the battery cells and the protective plate.

[0033] In related technologies, the protective plate is tightly connected to the electrical connector through continuously applied structural adhesive to form an integrated protective structure. This method improves the structural strength and deformation resistance of the battery device under side impact conditions, and can also effectively disperse and absorb lateral impact forces, reduce the risk of damage to individual battery cells, enhance the overall vehicle safety performance, and meet the application requirements of high-safety-level new energy vehicles. However, if there is too much structural adhesive between the protective plate and the electrical connector, the terminal of the battery cell may be pulled off by the electrical connector connected to it. When the terminal is pulled off, the contact resistance between the terminal and the internal components of the battery cell increases. Under high-current charging and discharging conditions, the contact point can heat up to a high temperature in a short time. In severe cases, it may ignite the surrounding electrolyte vapor or plastic support, forming a continuous electric arc, or even triggering thermal runaway. In the battery device of this application embodiment, the first element is the protective plate, and the second element is the electrical connector. The battery cell, the electrical connector, and the protective plate are installed sequentially, and the electrical connector and the protective plate are fixedly connected by structural adhesive in the through holes of the substrate. When a battery pack experiences a side impact, the lateral force causes the protective plate to displace the electrical connectors laterally. The structural adhesive bonding the connectors and the protective plate forms multiple dispersed adhesive columns. While the shear stiffness of each column decreases, its tensile toughness increases. This disperses the adhesive force across several columns, preventing the electrical connectors from directly impacting the weld seams of the connected battery cells, thus reducing the pull-out force on the terminals. Especially when the substrate includes a buffer layer, the buffer layer absorbs displacement and cushions the force, further reducing the pull-out force on the terminals. This minimizes the risk of the electrical connectors detaching from the connected battery cells, reducing the risk of short-term temperature rise and improving the overall safety of the battery pack.

[0034] In some embodiments, the first element and the second element are two battery cells.

[0035] In the battery device, the first element and the second element are two different battery cells. The filling points of the structural adhesive are dispersed through the through holes of the substrate, which helps to reduce the phenomenon of adhesive overflow or excessive adhesive between the two battery cells that are fixedly connected by the structural adhesive.

[0036] In some embodiments, the first element is a single battery cell, and the second element is the housing of the battery device.

[0037] In the battery device, the first element is the battery cell, and the second element is the battery device housing. Because the structural adhesive is confined within the through holes, it helps to reduce the problem of adhesive overflow or excessive amount.

[0038] In some embodiments, the first element is a battery cell and the second element is a cooling plate.

[0039] In the battery device, the first element is the battery cell, and the second element is the cooling plate. The structural adhesive can be a thermally conductive structural adhesive. The structural adhesive is reasonably arranged in the corresponding position through the through holes of the substrate, which helps to prevent the overflow of adhesive or excessive adhesive between the battery cell and the cooling plate.

[0040] In another aspect, this application provides an electrical device including the aforementioned battery device, the battery device being used to provide electrical energy to the electrical device.

[0041] The electrical equipment of this application embodiment has the advantages of the battery device described in this application embodiment.

[0042] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0044] Figure 1 This is a schematic diagram of the structure of an electrical device according to some embodiments of this application.

[0045] Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments of this application.

[0046] Figure 3 for Figure 2 An exploded view of the battery device portion of the embodiment shown.

[0047] Figure 4 for Figure 3 A partially exploded view of the battery device in the illustrated embodiment.

[0048] Figure 5 for Figure 3 A partially exploded view of the battery device in the illustrated embodiment.

[0049] Figure 6 This is a schematic diagram of the substrate structure of a battery device according to some embodiments of this application.

[0050] Figure 7 This is a schematic diagram of the substrate structure of a battery device according to other embodiments of this application.

[0051] Figures 1 to 7 In the figures, the labels represent: B. Battery device; D. Electrical equipment; X, first direction; Y, second direction; Z, Third-party direction; C. Accommodation space; 1. First component; 11. Protective plate; 111. Strip-shaped protrusion; 2. Second component; 21. Electrical connector; 3. Structural adhesive; 4. Substrate; 41. Through-hole; 5. Battery cell; 51. Terminal post; 6. First shell; 7. Second shell; 8. Isolation plate. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components illustrated in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0054] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0055] In the description of this application, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0056] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "horizontal, up, down, front, back, left, right" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] In the following description, the first direction X is the length direction of battery device B, the second direction Y is the width direction of battery device B, and the third direction Z is the height direction of battery device B (corresponding to...). Figures 2 to 5 (the vertical direction in the middle).

[0058] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0059] In the process of developing the technical solution of this application, the inventors discovered that when different components in a battery device are bonded together using structural adhesive, problems such as adhesive overflow and excessive adhesive amount occur. Based on this, this application provides a battery device that uses a substrate with a buffer layer comprising multiple through holes between a first component and a second component. Structural adhesive is filled into at least some of the through holes, and the first and second components are fixedly connected by the structural adhesive filled into the through holes. Since the amount and position of the structural adhesive can be controlled by the number and size of the through holes in the substrate, and the through holes for filling the structural adhesive can be selected according to the bonding position and requirements of the first and second components, it is beneficial to accurately control the filling amount, bonding position, and bonding strength of the structural adhesive, thereby achieving reasonable control of the amount of structural adhesive used and effectively solving the adhesive overflow problem. Simultaneously, the buffer layer can absorb the relative displacement when the first component 1 and the second component 2 collide sideways, thereby reducing the pull-out force on other components connected to the first component 1 or the second component 2.

[0060] Furthermore, this application also provides an electrical device including the battery device. The battery device is configured to provide electrical power to the electrical device.

[0061] Electrical equipment can include, but is not limited to, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0062] A battery device is a single physical module that includes one or more battery cells to provide higher voltage and capacity. A battery device typically includes a housing for encapsulating the one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] A battery cell refers to the smallest unit that makes up a battery. In this application, a battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., but this application is not limited to these types. A battery cell may be flat, cuboid, or other shapes, but this application is not limited to these shapes either. Battery cells are generally packaged as square battery cells and pouch battery cells, but this application is not limited to these shapes either.

[0064] like Figures 1 to 7 As shown, this application provides a battery device B, including: a first element 1, a second element 2, a substrate 4, and structural adhesive 3. The substrate 4 includes a buffer layer and has a plurality of through holes 41. The substrate 4 is disposed between the first element 1 and the second element 2 and is adhered to the first element 1 and the second element 2. The structural adhesive 3 fills at least a portion of the through holes 41 and is used to fix the first element 1 and the second element 2 together.

[0065] The first element 1 and the second element 2 can be any two elements in the battery device that can be bonded together by structural adhesive. For example, the first element 1 and the second element 2 can be two battery cells bonded together, or electrical connecting pieces and protective plates bonded together, or battery cells and water cooling plates bonded together, etc.

[0066] The buffer layer can be made of plastic or elastic materials or fiber fabrics, etc. These materials all have a certain degree of elasticity and can be used to form a buffer between the first element 1 and the second element 2.

[0067] The material, structure, shape, size, number, size and distribution of the through holes on the substrate 4 can all be set according to the structure and shape of the first element 1 and the second element 2 to be bonded and the bonding requirements.

[0068] Structural adhesive 3 enables reliable connection and fixation between the first element 1 and the second element 2. Structural adhesive 3 can possess high strength, flexibility, aging resistance, flame retardancy, insulation, and thermal conductivity to ensure the stability and safety of the battery device during use. Structural adhesive 3 can include polyurethane structural adhesive, acrylic structural adhesive, silicone, epoxy structural adhesive, UV adhesive, and high-temperature hot melt adhesive, etc.

[0069] The substrate 4 is bonded to the first element 1 and the second element 2. This can be achieved by having the two opposing surfaces of the substrate 4 in close contact with the corresponding surfaces of the first element 1 and the second element 2, respectively, with no obvious gaps in the contact area, forming a surface contact fit relationship, so as to achieve stable positioning of the substrate 4 between the first element 1 and the second element 2.

[0070] Structural adhesive 3 fills at least a portion of the multiple through holes 41. This can be partial or complete filling of the through holes 41 on the substrate 4, ensuring that the adhesive wets the inner wall of the through holes 41 and bonds to the contact surfaces of the first element 1 and the second element 2 on both sides of the through holes 41. The structural adhesive 3 can be filled into the through holes using an adhesive application device. This device can be a dispensing device or a continuous coating device. The dispensing device can precisely apply the structural adhesive 3 into the corresponding through holes 41. The continuous coating device can efficiently apply the structural adhesive 3 into the corresponding through holes 41, while simultaneously forming a thinner layer of structural adhesive on the surface of the substrate 4 on the adhesive-applied side. This adhesive layer facilitates a stable connection between the substrate 4 and the first element 1 or the second element 2 on the corresponding side, thus providing auxiliary fixation.

[0071] The structural adhesive 3 fixes the first element 1 and the second element 2. This can be achieved by using the adhesive effect of the structural adhesive 3 filled in the through hole 41 of the substrate 4 to connect and fix the first element 1 and the second element 2, restricting their relative displacement. This allows them to form an integral load-bearing structure, which is beneficial for withstanding vibration, impact and other loads during the use and transportation of the battery device B.

[0072] In battery device B, a substrate 4 with a buffer layer, including multiple through holes 41, is provided between the first element 1 and the second element 2. At least some of the through holes 41 are filled with structural adhesive 3, thereby fixing the first element 1 and the second element 2 together through the structural adhesive 3 filled in the through holes 41. Since the amount and position of the structural adhesive 3 can be controlled by the number and size of the through holes 41 of the substrate 4, and the through holes 41 filled with the structural adhesive 3 can be selected according to the bonding position and requirements of the first element and the second element, it is beneficial to accurately control the filling amount, bonding position and bonding strength of the structural adhesive, thereby achieving reasonable control of the amount of structural adhesive used and effectively solving the problem of adhesive overflow. The substrate 4 includes a buffer layer, which can absorb the relative displacement when the first element 1 and the second element 2 collide sideways, thereby reducing the pull-out force on other elements connected to the first element 1 or the second element 2.

[0073] In some embodiments, such as Figures 4 to 7 As shown, at least one through hole 41 is circular, elliptical, polygonal, or has multiple protruding branches.

[0074] The shape of the through hole 41 can be set according to the shape of the first element 1 or the second element 2, the bonding force requirements between the first element 1 and the second element 2, etc.

[0075] The through-hole 41 can be circular or elliptical. The inner wall surface of the circular and elliptical through-hole 41 is smooth, which facilitates the uniform filling of the structural adhesive 3 within the through-hole 41. In particular, the elliptical through-hole 41 extends along a specific direction, which helps to improve the connection strength between the first element 1 and the second element 2 in that specific direction.

[0076] The through-hole 41 can be polygonal, including rectangles, triangles, or hexagons. Polygonal through-holes 41 allow for different shapes and distributions to be customized according to various requirements. For example, the dimensional differences in different directions of polygonal through-holes 41, such as the dimensional differences in different directions of rectangular through-holes, can be used to achieve different connection strengths between the first element 1 and the second element 2 in different directions. Furthermore, the shapes of polygonal through-holes 41, such as triangular or hexagonal through-holes 41, can be used to arrange through-holes 41 more densely, thereby obtaining a larger contact area between the structural adhesive 3 and the first element 1 and the second element 2.

[0077] The through-hole 41 can be shaped with multiple protruding branches, including a polygonal star, a cross, a flower, etc. The multiple branches can be centrally symmetrical, or at least some of the branches can be of different lengths. The shape of the through-hole 41 with multiple protruding branches facilitates the dispersion of the adhesive force of the structural adhesive 3 onto the first element 1 and the second element 2 in multiple directions, providing stronger adhesive force in the branch directions.

[0078] The above only illustrates the shape of the through hole 41. In other embodiments of this application, the through hole 41 can be set to other shapes.

[0079] In some embodiments, such as Figures 4 to 7 As shown, at least some of the through holes 41 are arrayed on the substrate 4.

[0080] The array distribution can be set according to the bonding requirements of the first element 1 and the second element 2, such as rectangular array, linear array, circular array, triangular array, honeycomb array, concentric circle array, etc. Figure 6 As shown, the through holes 41 are rectangular, two rectangular through holes 41 form a group, and multiple groups of rectangular through holes 41 are arranged at intervals along the first direction X. Figure 7 As shown, the through hole 41 is circular, but... Figures 2 to 5 The arrangement of the through holes 41 in the illustrated embodiment is different. Figure 7 In the middle, multiple through holes 41 are arranged in a straight line at an angle of 45 degrees to the first direction X to form a through hole group, and multiple through hole groups are arranged side by side at intervals.

[0081] Arranging at least some of the through holes 41 in an array on the substrate 4 facilitates the uniform and regular distribution of the connection force between the first element 1 and the second element 2 to multiple points through the structural adhesive 3 disposed in the through holes 41, which helps to reduce stress concentration and thus prevent the structural adhesive 3 from cracking or delaminating. It also facilitates precise control of the adhesive application device, application position, and amount of adhesive.

[0082] In some embodiments, such as Figures 4 to 7 As shown, at least two through holes 41 have the same shape or area; and / or at least two through holes 41 have different shapes or areas.

[0083] For example, a larger through hole 41 can be provided in a high-load area, a smaller through hole 41 can be provided in a low-load area, a circular through hole 41 or a regular polygonal through hole 41 or a through hole 41 of other centrally symmetrical shape can be provided in a region with uniform load in all directions, and an elliptical through hole 41 or a strip-shaped through hole 41 or a through hole 41 of other non-centrally symmetrical shape can be provided in a region with different load in all directions.

[0084] At least two through holes 41 have the same shape and area, forming a group of through holes with the same shape and / or area. This facilitates the processing of the through holes 41 on the substrate 4 and also helps to evenly distribute the bonding force required by the structural adhesive 3 inside the through holes 41 to multiple locations to reduce stress concentration.

[0085] The shape and area of ​​at least two through holes 41 are different, which is beneficial to setting through holes 41 with different shapes and / or areas according to the connection position of the first element 1 and the second element 2, and to accurately control the amount of structural adhesive 3 at different positions according to the connection requirements.

[0086] In some embodiments, the plurality of through holes 41 are divided into a plurality of through hole groups, each through hole group being arranged in a different region of the substrate 4, wherein the shape, area and / or distribution of the through holes 41 in at least two through hole groups are different.

[0087] For example, a large through hole 41 is provided at the location where a stronger adhesive force is required to cope with the higher shear force and tensile force that may be exerted between the first element 1 and the second element 2.

[0088] Multiple through holes 41 are divided into multiple through hole groups, and each through hole group is arranged in different areas of the substrate 4. The shape, area and / or distribution of the through holes 41 in different through hole groups are different, which is beneficial to set through holes 41 for different areas of the first element 1 and the second element 2 to cope with stresses of different directions and sizes.

[0089] In some embodiments, the substrate 4 is at least partially deformable; and / or the substrate 4 is strip-shaped; and / or the substrate 4 includes an adhesive layer located on at least one side surface.

[0090] The substrate 4 is at least partially deformable. All parts of the substrate 4 may be deformable. For example, the main body of the substrate may be made of a flexible material, an elastic material, or a bendable material. Alternatively, a portion of the substrate may be deformable, such as being made of a flexible material, an elastic material, or a bendable material, or being locally thinned. For example, a deformable portion may be provided at a location corresponding to the bending portion of the first element 1 or the second element 2.

[0091] The substrate 4 is at least partially deformable, which facilitates the substrate to be set along a non-linear path, so that the non-planar first element 1 and second element 2 can also be bonded by structural adhesive 3 in which the substrate 4 is combined in the through hole 41 of the substrate 4.

[0092] The substrate 4 is strip-shaped, which means that the substrate 4 is narrow and long with roughly parallel sides. For example, in this application, the length of the substrate 4 is more than twice the width of the substrate 4, so it can be called a strip-shaped substrate 4.

[0093] The substrate 4 is strip-shaped, which is beneficial for one substrate 4 to cover the longer connection area of ​​the first element 1 or the second element 2, and further facilitates the reduction of installation steps.

[0094] The substrate 4 includes an adhesive layer on at least one surface, meaning that the substrate 4 has an adhesive layer pre-applied before being fixed relative to the first element 1 or the second element 2. This adhesive layer can be made of pressure-sensitive adhesive, which is an adhesive that can produce adhesion under slight pressure. Its adhesion depends on the bonding between the adhesive molecules and the surface of the adherend. The pressure-sensitive adhesive can be, for example, an elastomer-type pressure-sensitive adhesive (such as a rubber-based pressure-sensitive adhesive) or a resin-type pressure-sensitive adhesive (such as an acrylic pressure-sensitive adhesive). When the substrate 4 includes an adhesive layer on at least one surface, in the installation process, the substrate 4 is first pasted onto the connection area of ​​the first element 1 or the second element 2, then structural adhesive 3 is filled into the corresponding through-hole 41, and then the second element 2 or the first element 1 is brought into contact with the substrate 4 to achieve a fixed connection between the first element 1 and the second element 2.

[0095] The substrate 4 can be, for example, single-sided or double-sided adhesive tape. Both single-sided and double-sided tapes can be based on a strip-shaped buffer layer made of plastic material. Applying adhesive (such as pressure-sensitive adhesive) to one side of the buffer layer forms single-sided tape, and applying adhesive to both sides forms double-sided tape. Applying adhesive to at least one side of the substrate 4 facilitates its initial fixation to the first element 1 or the second element 2 via bonding, followed by subsequent steps of applying structural adhesive within the through-hole 41 and assembly. This simplifies the fixing and connection process between the substrate 4 and the first element 1 and the second element 2. When the substrate 4 is coated with adhesive on both sides, in addition to limiting the amount and position of the structural adhesive 3, the substrate 4 also provides auxiliary fixing and connection for the first element 1 and the second element 2.

[0096] In some embodiments, such as Figures 3 to 5 As shown, a first element 1 and a plurality of second elements 2 located on the same side of the first element 1 are fixedly connected by structural adhesive 3 in one or more through holes 41 of the substrate 4.

[0097] When a larger element (corresponding to the first element 1) of a battery device is simultaneously bonded to two or more smaller elements (corresponding to the second element 2) on the same side, it is suitable to fix the connection through structural adhesive in the through-holes of one or more substrates. For example, when the first element 1 is a protective plate and the multiple second elements 2 are multiple electrical connecting pieces, one substrate (such as a sheet-like substrate corresponding to the area of ​​the protective plate) or multiple substrates (such as multiple substrates corresponding to the shape and size of the multiple electrical connecting pieces) can be provided corresponding to the protective plate, and each electrical connecting piece is fixedly connected to the same protective plate through structural adhesive in the through-holes of the corresponding substrate.

[0098] By fixing multiple second elements 2 to one side of the same first element 1 through one or more substrates 4, it is beneficial to improve the operation of connecting the same first element 1 and multiple second elements 2, and improve the assembly efficiency of battery device B.

[0099] In some embodiments, such as Figures 3 to 7As shown, substrate 4 is strip-shaped, and multiple substrates 4 are arranged side by side at intervals.

[0100] For example, when the first element 1 is a protective plate 11 and the multiple second elements 2 are multiple electrical connecting pieces 21, multiple strip-shaped substrates 4 with side-by-side spacing, less than or equal to the width of the electrical connecting pieces 21 and approximately equal to the length of the protective plate 11, can be provided corresponding to the protective plate 11. Each electrical connecting piece 21 is fixedly connected to the same protective plate 11 through the structural adhesive in the through hole 41 of the corresponding substrate 4.

[0101] Multiple strip-shaped substrates 4 can be arranged side by side with intervals to form an array of strip-shaped substrates 4 between the first element 1 and the second element 2. The strip-shaped substrates 4 are easy to process and can be laid out as needed. For example, when the substrates 4 are arranged at the same position between the first element 1 and multiple second elements 2, multiple strip-shaped substrates 4 can be arranged side by side with intervals to reduce the area of ​​the substrates 4 that is ineffectively covering the first element 1.

[0102] In some embodiments, the depth of the through hole 41 does not exceed 2 mm.

[0103] The depth of the through hole 41 is, for example, 0.2mm, 0.5mm, 1mm, 1.25mm, 1.5mm and 2mm.

[0104] The depth of the through hole 41 in the substrate 4 is within 2mm, which is conducive to the filling of the structural adhesive 3 and the formation of effective bonding ability. Furthermore, the amount of structural adhesive 3 can be accurately calculated based on the area of ​​the through hole 41, which helps to reduce the amount of adhesive and prevent adhesive overflow while ensuring the connection strength and reliability of the substrate 4.

[0105] In some embodiments, the substrate 4 includes an adhesive layer disposed on at least one side surface of the buffer layer.

[0106] The substrate 4 includes an adhesive layer disposed on at least one side surface of the buffer layer. The adhesive layer may be disposed on the side of the buffer layer facing the first element 1, or on the side of the buffer layer facing the second element 2, or on both sides of the buffer layer facing the first element 1 and the second element 2 respectively.

[0107] The substrate 4 includes an adhesive layer disposed on at least one side of the buffer layer, which facilitates the substrate 4 to be first fixedly installed to the first element 1 or the second element 2 by adhesive bonding, and then the subsequent steps of applying structural adhesive 3 in the through hole 41 and assembly are performed. Therefore, it is beneficial to simplify the fixing and connection process between the substrate 4 and the first element 1 and the second element 2. When the substrate 4 is coated with adhesive on both sides, in addition to limiting the amount and position of the structural adhesive 3, the substrate 4 also plays an auxiliary role in fixing and connecting the first element 1 and the second element 2. The buffer layer can absorb the relative displacement when the first element 1 and the second element 2 collide sideways, thereby reducing the pull-out force on other elements connected to the first element 1 or the second element 2. Furthermore, when the substrate 4 includes an adhesive layer disposed on at least one side of the buffer layer, its own deformation capacity is better, which is beneficial for the substrate 4 to be set along a non-linear path, so that the non-planar first element 1 and the second element 2 can also be bonded by using the structural adhesive 3 of the substrate 4 combined in the through hole of the substrate 4.

[0108] In some embodiments, the buffer layer includes a polypropylene layer, a polycarbonate layer, or a polyethylene terephthalate layer.

[0109] The buffer layer includes a polypropylene (PP) layer, a polycarbonate (PC) layer, or a polyethylene terephthalate (PET) layer. The polypropylene, polycarbonate, or polyethylene terephthalate buffer layer has excellent mechanical strength, temperature resistance, and anti-aging properties, meeting the strict requirements of modern industry for green environmental protection. It also has sufficient deformation capacity and a suitable compression ratio, which helps the structural adhesive 3 in the through hole 41 to bond the first element 1 and the second element 2.

[0110] In some embodiments, the first element 1 includes a first protrusion facing the side of the second element 2, and the substrate 4 is disposed between the first protrusion and the second element 2; and / or the second element 2 includes a second protrusion facing the side of the first element 1, and the substrate 4 is disposed between the first element 1 and the second protrusion.

[0111] The shapes of the first and second protrusions are, for example, strip-shaped, square, or circular, and preferably correspond to the locations on the substrate 4 where the through-holes 41 are provided. For example, Figures 2 to 5 In the illustrated embodiment, the first element 1 is a protective plate 11, the second element 2 is an electrical connector 21, and the first protrusion is a strip-shaped protrusion 111 protruding from the protective plate 11 toward the electrical connector 21. The strip-shaped protrusion 111 refers to a narrow, elongated protrusion with roughly the same direction of extension on both sides. For example, in this application, if the length of the protrusion is greater than twice the width of the protrusion, it can be called a strip-shaped protrusion 111.

[0112] The first element 1 includes a first protrusion facing the second element 2 and / or the second element 2 includes a second protrusion facing the first element 1. This facilitates the connection of the first element 1 and the second element 2 by applying pressure to the structural adhesive 3 within the substrate 4 and its through-hole 41. This ensures that the substrate 4 (if it has an adhesive layer or a thin structural adhesive layer on its surface due to a continuous coating process) and the structural adhesive 3 within its through-hole 41 can make full contact with the corresponding protrusion or element, thereby improving the connection reliability of the first element 1 and the second element 2. It also facilitates the provision of installation space for other components of the battery device B, such as flexible circuit boards and temperature sensing elements, within the space formed by adjacent protrusions. Furthermore, the first protrusion and / or the second protrusion also help to improve the structural strength of the first element 1 and / or the second element 2.

[0113] In some embodiments, such as Figures 2 to 5 As shown, the battery device B also includes a battery cell 5; the first element 1 includes a protective plate 11; the second element 2 includes an electrical connecting piece 21, which is configured to electrically connect different battery cells 5 and is disposed between the battery cell 5 and the protective plate 11.

[0114] like Figures 1 to 5 In the illustrated embodiment, the top cover of the battery cell 5 is provided with a terminal post 51, wherein the terminal post 51 can be oriented upwards, and multiple electrical connecting pieces 21 are used to connect different battery cells 5, with a protective plate 11 disposed above the multiple electrical connecting pieces 21. During the specific installation of the battery device B, the battery device B can be arranged as follows: Figures 1 to 5 The direction setting shown can also be used with... Figure 1 and Figure 5 The battery pack shown is placed in the opposite direction (inverted) of the Z-axis, with the protective plate 11 at the bottom and the battery cell 5 at the top. The protective plate 11 is close to the ground in the Z-axis direction. The protective plate 11 is used to support and protect the battery cell 5, which can improve the impact resistance of the bottom of the battery pack B. The electrical connection piece 21 can be made of copper or aluminum, etc. The connection parts of the electrical connection piece 21 connecting different terminals can be bent relative to the connection parts to form a buffer structure to prevent the electrical connection piece 21 from tearing due to the expansion or impact of the battery cell 5. Multiple electrical connection pieces 21 are jointly arranged on a separator plate 8. The protective plate 11 is a rigid plate and is set on the side of the electrical connection piece 21 away from the battery cell 5. The protective plate 11 is used to protect the electrical connection piece 21 and the battery cell 5, which helps to prevent the electrical connection piece 21 from being torn off the battery cell 5 due to side impact, thereby helping to avoid thermal runaway caused by the battery pack B.

[0115] In related technologies, the protective plate is tightly connected to the electrical connector through continuous application of structural adhesive to form an integrated protective structure. This method improves the structural strength and deformation resistance of the battery device under side collision conditions, and can also effectively disperse and absorb side impact forces, reduce the risk of damage to individual battery cells, enhance the overall vehicle safety performance, and meet the application requirements of high-safety-level new energy vehicles. However, if there is too much structural adhesive between the protective plate and the electrical connector, it may cause the terminal of the battery cell to be pulled off by the electrical connector connected to it. When the terminal is pulled off, the contact resistance between the terminal and the internal components of the battery cell increases. Under high current charging and discharging conditions, the contact point can heat up to a high temperature in a short time. In severe cases, it may ignite the surrounding electrolyte vapor or plastic support, forming a continuous electric arc, or even triggering thermal runaway.

[0116] In the battery device B of this application embodiment, the first element 1 is a protective plate 11, and the second element is an electrical connecting piece 21. The battery cell 5, the electrical connecting piece 21 and the protective plate 11 are installed in sequence, and the electrical connecting piece 21 and the protective plate 11 are fixedly connected by structural adhesive 3 in the through hole 41 of the substrate 4.

[0117] When battery device B experiences a side impact, it is subjected to a lateral force. The protective plate 11 causes the electrical connector 21 to shift laterally. The structural adhesive 3 bonding the electrical connector 21 and the protective plate 11 forms multiple dispersed adhesive columns. The shear stiffness of each column decreases, but the tensile toughness increases. This disperses the adhesive force among several columns, preventing the electrical connector 21 from being directly subjected to the weld of the terminal post 51 of the connected battery cell 5, thus reducing the pull-out force on the terminal post 51. Especially when the substrate 4 includes a buffer layer, the buffer layer can absorb displacement and buffer the force, which also helps to reduce the pull-out force on the terminal post 51. This reduces the risk of the electrical connector 21 pulling off the terminal post 51 of the connected battery cell 5, thereby reducing the risk of short-term wind-induced temperature rise and improving the safety of battery device B.

[0118] In some embodiments, the first element and the second element are two battery cells.

[0119] In battery device B, the first element and the second element are two different battery cells. The filling points of structural adhesive 3 are dispersed through the through holes 41 of the substrate 4, which helps to reduce the phenomenon of overflow or excessive amount of adhesive between the two battery cells that are fixedly connected by structural adhesive 3.

[0120] In some embodiments, the first element is a single battery cell, and the second element is the housing of the battery device.

[0121] In some embodiments, the housing may specifically include a first housing 6 and a second housing 7, which overlap each other, and together define a receiving space C for accommodating the battery cell 5. The second housing 7 may be a hollow structure with one open end, and the first housing 6 may be a plate-like structure, with the first housing 6 covering the open side of the second housing 7 so that the first housing 6 and the second housing 7 together define the receiving space; alternatively, both the first housing 6 and the second housing 7 may be hollow structures with one open side, with the open side of the first housing 6 covering the open side of the second housing 7. The housing formed by the first housing 6 and the second housing 7 can be of various shapes, such as a cylinder, a cuboid, etc. A beam may be provided inside the first housing 6 or the second housing 7. The bottom of the battery cell 5 (the wall opposite the top cover) may be bonded to the bottom wall of the housing (corresponding to the bottom wall of the second housing 7); alternatively, the side of the battery cell 5 may be bonded to the side wall of the housing or the side wall of the beam.

[0122] In battery device B, the first element is a battery cell and the second element is the battery device housing. Because the structural adhesive 3 is confined within the through hole 41, it helps to reduce the problem of excess adhesive 3 or excessive adhesive amount.

[0123] In some embodiments, the first element is a battery cell and the second element is a cooling plate.

[0124] In some embodiments, the cooling plate includes an internal flow channel through which a heat exchange medium flows to remove heat from the battery cell 5 when its temperature is high or to heat the battery cell 5 when its temperature is low. The heat exchange medium may include, for example, ethylene glycol or deionized water. The cooling plate can be bonded to the large surface, adjacent side surface, top cover, or bottom surface of the battery cell 5. The large surface can be the wall surface with the largest area of ​​the battery cell 5. For example, the battery cell 5 may include multiple walls and electrode assemblies, with the multiple walls forming a closed cavity to accommodate the electrode assemblies, the orthographic projection of the electrode assemblies on the large surface being larger than that on other walls. The cooling plate can be disposed between different battery cells 5 or between the battery cell 5 and the housing. To achieve good heat exchange between the cooling plate and the battery cell 5, thermally conductive adhesive or thermally conductive pads can be applied to the areas of the cooling plate and battery cell 5 where the substrate 4 and structural adhesive 3 are not present.

[0125] In battery device B, the first element is a battery cell, the second element is a cooling plate, and the structural adhesive 3 can be a thermally conductive structural adhesive. The structural adhesive 3 is reasonably arranged in the corresponding position through the through hole 41 of the substrate 4, which helps to prevent overflow of adhesive or excessive amount of adhesive between the battery cell and the cooling plate.

[0126] like Figure 1 As shown, this application also provides an electrical device D, including the battery device B of the foregoing embodiment, the battery device B being configured to provide electrical energy to the electrical device D.

[0127] The following is combined with Figures 1 to 7 The structure of the battery device B and the electrical device D of some embodiments of this application will be described in more detail.

[0128] like Figure 1 As shown, electrical equipment D includes a battery device B, which provides electrical energy to electrical equipment D. Electrical equipment D includes an electric vehicle.

[0129] like Figure 2 and Figure 3 As shown, battery device B includes a housing, a first element 1, a substrate 4, structural adhesive 3, a second element 2, a battery cell 5, and a separator 8. The housing includes a first shell 6 and a second shell 7 that are interlocked, and the interior of the housing forms an accommodating space C.

[0130] The first element 1 is a protective plate 11, and the second element 2 is an electrical connecting piece 21. Each battery cell 5 includes a terminal post 51, and the electrical connecting piece 21 electrically connects the terminals 51 of different battery cells 5. Multiple battery cells 5, separators 8, multiple electrical connecting pieces 21, and protective plates 11 are arranged along a third direction Z and installed within the accommodating space C.

[0131] The substrate 4 is disposed between the electrical connector 21 and the protective plate 11. The substrate 4 is in the form of double-sided adhesive tape, the base of which is a buffer layer, the buffer layer is a polypropylene layer, and both sides of the polypropylene layer are coated with pressure-sensitive adhesive to form an adhesive layer. The upper and lower sides of the substrate 4 are respectively bonded to the protective plate 11 and multiple electrical connectors 21. The substrate 4 includes multiple through holes 41, each of which is filled with structural adhesive 3, which fixes the electrical connector 21 and the protective plate 11.

[0132] The substrate 4 extends along the first direction X, and multiple substrates 4 are arranged side by side at intervals along the second direction Y. Each substrate 4 is fixedly connected between multiple electrical connecting pieces 21 and the protective plate 11 along the first direction X. The structural adhesive 3 in the multiple through holes 41 of each substrate 4 is used to fix the multiple electrical connecting pieces 21 and the protective plate 11 bonded to the substrate 4.

[0133] The protective plate 11 has multiple downwardly protruding strip-shaped protrusions 111 arranged at intervals along the second direction Y. Each strip-shaped protrusion 111 corresponds to the position of the area of ​​the corresponding row of electrical connecting pieces 21 distributed along the first direction X that corresponds to the pole 51, and the surface facing the electrical connecting piece 21 is a plane. The length and width of the plane are greater than or equal to the length and width of the corresponding double-sided tape, and each double-sided tape is disposed between the strip-shaped protrusion 111 and the corresponding row of electrical connecting pieces 21. This design allows the strip-shaped protrusion 111 to apply pressure to the double-sided tape and the structural adhesive 3 in the through-hole 41 when connecting the protective plate 11 and the electrical connector 21. This ensures that the double-sided tape and the structural adhesive 3 in the through-hole 41 can make full contact with both the strip-shaped protrusion and the electrical connector 21, thereby improving the connection reliability between the protective plate 11 and the electrical connector 21. It also provides installation space for other components of the battery device B, such as flexible circuit boards and temperature sensing elements, between adjacent strip-shaped protrusions 111. Furthermore, the strip-shaped protrusion 111 helps to improve the structural strength of the protective plate 11, enabling it to provide better protection.

[0134] During the assembly of battery device B, multiple battery cells 5 are installed inside the second housing 7, and a separator plate 8 is installed above the multiple battery cells 5. The terminals 51 of the multiple battery cells 5 are exposed above the separator plate 8 through through-holes. Multiple electrical connecting pieces 21 are disposed on the separator plate 8 and welded to the corresponding terminals 51, thereby achieving electrical connection with the terminals 51. Multiple substrates 4 are attached to the multiple electrical connecting pieces 21 at intervals parallel to each other along the second direction Y. Multiple through-holes 41 are provided on each substrate 4 in the area corresponding to each terminal 51 of the attached electrical connecting piece 21. For example... Figure 4 and Figure 5 In the embodiment shown, six through holes 41 are provided in the area corresponding to each pole post 51. The six through holes 41 are arranged in an array in the corresponding area. Correspondingly, twelve through holes 41 are provided for a single electrical connection piece 21.

[0135] Then, structural adhesive 3 is filled into each through-hole 41 to form adhesive columns within the through-hole 41 for bonding each electrical connector 21 and the protective plate 11. The adhesive application device for applying structural adhesive 3 into the through-holes is, for example, a dispensing device or a continuous coating device. The dispensing device can precisely apply structural adhesive 3 into the corresponding through-hole 41. The continuous coating device can efficiently apply structural adhesive 3 into the corresponding through-hole 41, while simultaneously forming a thinner structural adhesive layer on the surface of the substrate 4 on the adhesive-applied side. This structural adhesive layer facilitates a stable connection between the substrate 4 and the first element 1 or second element 2 on the corresponding side, thus providing auxiliary fixing. Both the dispensing device and the continuous coating device can be used for substrates without an adhesive layer on the surface of the substrate 4, as well as for substrates with an adhesive layer on the surface of the substrate 4.

[0136] Cover the protective plate 11 and press it down to firmly adhere the structural adhesive 3 in the substrate 4 and each through hole 41 to the protective plate 11 and each electrical connection piece 21. After assembling all the components in the housing space C, cover the first housing 6 to complete the assembly of the battery device B.

[0137] In this embodiment, when the battery device B is installed on the electric vehicle D, the first housing 6 can be below and the second housing 7 can be above, thereby realizing the inversion of the battery device B. At this time, the protective plate 11 is below the battery cell 5, and multiple electrical connecting pieces 21 are located between the protective plate 11 and the battery cell 5.

[0138] In related technologies, the use of structural adhesives between different components relies on a uniformly applied, fully covered structural adhesive layer, which often faces the problem of fixed adhesive application amount and inability to accurately match bonding requirements. In the embodiments of this application, by providing a substrate 4 with through holes 41 and structural adhesive 3 disposed within the through holes 41, the bonding performance and control precision between the first component 1 and the second component 2 are effectively improved.

[0139] As can be seen from the above description, the battery device B of some embodiments of this application has at least one of the following advantages:

[0140] In some embodiments of this application, the shape, size, distribution density, and arrangement of the through holes 41 on the substrate 4 can be customized and flexibly adjusted according to the actual needs of the bonding area and adhesive amount control of the first element 1 and the second element 2. This facilitates the "micro-control" of the effective bonding area and local adhesive amount between the first element 1 and the second element 2. By rationally setting multiple through holes 41, the amount and position of the structural adhesive 3 can be precisely controlled. In critical areas requiring strong adhesion, sufficient adhesive amount can be provided through a high-density and / or large-area through hole 41 design; while in areas where adhesive overflow needs to be avoided or where repeated positioning is convenient, the amount of adhesive can be reduced by sparsely arranging or using small-area through holes 41. This precise control helps avoid the problems of adhesive overflow or excessive adhesive amount in the use of traditional continuously coated structural adhesives, and helps solve industry pain points such as adhesive overflow contaminating surrounding components and difficulty in adjusting excessive initial tack. It achieves a qualitative change from "sufficient" to "precisely applicable," meets the requirements of the manufacturing field for bonding processes, and facilitates the achievement of higher precision and more demanding bonding effects.

[0141] In some embodiments of this application, by rationally configuring the shape (e.g., strip), material (e.g., elasticity, deformability, high-temperature resistance, corrosion resistance), and adhesive properties (e.g., double-sided or single-sided adhesive layer) of the substrate 4, the functionality and applicability of the substrate 4 can be improved, expanding the application potential of the technical solution of this application in special working conditions. For example, in high-humidity environments, curved component connections, or situations with strict requirements for volatile emissions, it can exhibit excellent stability and adaptability. For instance, based on the contour features, spatial position, and mechanical distribution requirements of the first component 1 and the second component 2, a suitable shape and material configuration of the substrate 4 can be selected. The flexible and diverse shape and performance design of the substrate 4 enables the substrate 4 to fit well with various planar and curved structures. In application environments where the internal space of the battery device B is limited, components are densely arranged, or there are irregular structures, precise matching and efficient coverage can also be achieved, thereby improving material utilization efficiency and construction convenience while ensuring adhesive strength. For example, in terms of the shape setting of the substrate 4, by providing substrates 4 in various shapes such as rectangles, squares, irregular strips and grids, and accurately matching them according to the complex spatial layout and the contours of related components inside the battery device B, it is beneficial to ensure the tight fit between the substrate 4 and the irregular surfaces of the first element 1 and the second element 2, eliminate bonding dead corners, and effectively improve the material coverage efficiency in a limited space. Thus, while ensuring comprehensive and reliable bonding, it avoids material waste, enhances the compactness and stability of the overall structure of the battery device B, and can adapt to the requirements of different contact surfaces and bonding scenarios.

[0142] In some embodiments of this application, the depth of the through-hole 41 can be adjusted by setting the thickness design of the substrate 4, making the thickness of the structural adhesive 3 adjustable and allowing for personalized customization based on specific requirements for controlling the bonding area and adhesive amount between the first element 1 and the second element 2. By precisely controlling the depth parameter of the through-hole 41, the overflow amount and distribution uniformity of the structural adhesive 3 under pressure can be effectively adjusted, thereby achieving precise management of bonding strength and adhesive amount. For example, a smaller through-hole 41 depth is suitable for battery device B with smaller bonding area and adhesive amount requirements and lower side impact requirements, helping to control costs and reduce weight; while a larger through-hole 41 depth can be used for battery device B that requires buffering and larger adhesive amount filling, and has higher side impact requirements, improving the structural integrity and safety performance of battery device B under mechanical impact (especially side impact). This design concept, which allows for adjustable thickness of structural adhesive 3 through the depth of through-hole 41, enables on-demand management of adhesive distribution. At the same time, it maintains the durability and reliability of the bonding interface under complex working conditions, ensuring that the substrate 4 and the structural adhesive 3 within its through-hole 41 maintain ideal bonding performance under different compression rates and surface morphologies, further expanding its application in battery device B.

[0143] 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 preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A battery device, characterized in that, include: First component; Second element; A substrate, including a buffer layer, having a plurality of through holes disposed between the first element and the second element, and in contact with the first element and the second element; Structural adhesive, filled in at least a portion of the plurality of through holes, is configured to securely connect the first element and the second element.

2. The battery device according to claim 1, characterized in that, At least one of the through holes is circular, elliptical, polygonal, or has multiple protruding branches.

3. The battery device according to claim 1, characterized in that, At least some of the vias are arrayed on the substrate.

4. The battery device according to claim 1, characterized in that, At least two of the through holes have the same shape or area; and / or At least one of the shapes or areas of the two through holes is different.

5. The battery device according to claim 1, characterized in that, The plurality of through holes are divided into a plurality of through hole groups, and each of the through hole groups is arranged in a different region of the substrate, wherein the shape, area and / or distribution of the through holes in at least two of the through hole groups are different.

6. The battery device according to claim 1, characterized in that, The substrate is at least partially deformable; and / or The substrate is strip-shaped; and / or The substrate includes an adhesive layer located on at least one side surface.

7. The battery device according to claim 1, characterized in that, One of the first elements and a plurality of the second elements located on the same side of the first element are fixedly connected by structural adhesive within one or more through holes in the substrate.

8. The battery device according to claim 7, characterized in that, The substrate is strip-shaped, and multiple substrates are arranged side by side at intervals.

9. The battery device according to claim 1, characterized in that, The depth of the through hole does not exceed 2 mm.

10. The battery device according to claim 1, characterized in that, The substrate includes an adhesive layer disposed on at least one surface of the buffer layer.

11. The battery device according to claim 1, characterized in that, The buffer layer includes a polypropylene layer, a polycarbonate layer, or a polyethylene terephthalate layer.

12. The battery device according to any one of claims 1 to 11, characterized in that, The first element includes a first protrusion facing the second element, and the substrate is disposed between the first protrusion and the second element; and / or The second element includes a second protrusion facing the side of the first element, and the substrate is disposed between the first element and the second protrusion.

13. The battery device according to any one of claims 1 to 11, characterized in that, The battery device also includes individual battery cells; The first element includes a protective plate; The second element includes an electrical connector configured to electrically connect different battery cells and disposed between the battery cells and the protective plate.

14. The battery device according to any one of claims 1 to 11, characterized in that, The first element and the second element are two battery cells.

15. The battery device according to any one of claims 1 to 11, characterized in that, The first element is a single battery cell, and the second element is the housing of the battery device.

16. The battery device according to any one of claims 1 to 11, characterized in that, The first component is a battery cell, and the second component is a cooling plate.

17. An electrical appliance, characterized in that, The battery device includes any one of claims 1 to 16, the battery device being configured to provide electrical energy to the electrical device.

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