Bottom plate, battery pack and electric device

Abstract

The utility model provides a bottom plate, a battery pack and an electric device, the bottom plate is used for being connected with an upper box body of the battery pack, and the bottom plate comprises a first composite material layer located on the inner side, a second composite material layer located on the outer side and a metal layer located between the first composite material layer and the second composite material layer; the thickness of the first composite material layer is smaller than that of the second composite material layer. The first composite material layer located on the inner side plays a role in insulation, and the second composite material layer located on the outer side plays a role in impact resistance and external corrosion resistance. And under the condition that the total thickness of the bottom plate is not changed, the thickness of the first composite material layer positioned on the inner side is reduced, and the thickness of the second composite material layer positioned on the outer side is increased, so that the impact resistance and corrosion resistance of the outer side can be enhanced, the single batteries in the box body can be better protected, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically provides a base plate, a battery pack and an electrical device. Background Art

[0002] Due to their environmental advantages, new energy sources are rapidly developing across various industries, particularly in power-consuming devices such as electric vehicles. The battery system is a key component of electric vehicles, and the power battery pack (hereafter referred to as the battery pack) is a core component. Technological developments in power battery packs are significantly impacting the growth of the electric vehicle industry.

[0003] Safety is one of the most important performance characteristics of a power battery pack, significantly impacting consumer acceptance of electric vehicles. Accidents of electric vehicles catching fire and exploding after collisions are common, raising concerns among consumers about their safety. Therefore, improving the safety of power battery packs is a pressing technical issue that needs to be addressed. Utility Model Content

[0004] In order to improve the safety of the battery pack, the present invention provides a bottom plate for connecting to the upper box body of the battery pack, the bottom plate includes a first composite material layer located on the inner side, a second composite material layer located on the outer side, and a metal layer located between the first composite material layer and the second composite material layer; the thickness of the first composite material layer is less than the thickness of the second composite material layer.

[0005] The first composite material layer on the inside provides insulation, while the second composite material layer on the outside provides impact and corrosion resistance. While maintaining the overall thickness of the base plate, reducing the thickness of the first composite material layer on the inside and increasing the thickness of the second composite material layer on the outside enhances the impact and corrosion resistance of the outer side, thereby better protecting the battery cells within the box and improving the safety of the battery pack.

[0006] In an optional technical solution of the present invention, the thickness H1 of the first composite material layer and the thickness H2 of the second composite material layer satisfy: 0.2 mm ≤ H1 ≤ 0.8 mm, 0.8 mm ≤ H2 ≤ 1.2 mm.

[0007] In an optional technical solution of the present invention, the thickness H3 of the metal layer satisfies: 0.6 mm ≤ H3 ≤ 1.2 mm.

[0008] In an optional technical solution of the present invention, the material of the first composite material layer includes at least one of continuous or discontinuous glass fiber, aramid fiber, basalt fiber and carbon fiber.

[0009] In an optional technical solution of the present invention, the material of the second composite material layer includes at least one of continuous or discontinuous glass fiber, aramid fiber, basalt fiber and carbon fiber.

[0010] In an optional technical solution of the present invention, the material of the metal layer includes at least one of steel and aluminum.

[0011] In an optional technical solution of the present invention, the metal layer is provided with through holes, and the first and second composite material layers are bonded together at the locations of the through holes. The provision of through holes in the metal layer can increase the bonding area between the first and second composite material layers, thereby improving the stability of the three-layer structure of the base plate.

[0012] The utility model also provides a battery pack, comprising a box body and a battery cell arranged in the box body, wherein the box body comprises an upper box body and the above-mentioned bottom plate.

[0013] In an optional technical solution of the present invention, the box body further includes a crossbeam, and the middle portion of the bottom plate is connected to the crossbeam.

[0014] In an optional technical solution of the present invention, the battery pack further includes a cold plate, disposed at the bottom of the battery cells. A buffer is disposed between the cold plate and the base plate. The buffer is formed by foaming directly onto the first composite material layer. The buffer also absorbs impact forces, protecting the battery cells and other components within the battery pack from damage. Forming the buffer onto the first composite material layer allows the buffer and base plate to be integrated, achieving a higher level of integration.

[0015] The utility model also provides an electrical device, comprising the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a battery pack 100;

[0017] Figure 2 is a schematic diagram of an embodiment of a base plate 400;

[0018] Figure 3 It is a partial schematic diagram showing the three-layer structure of the bottom plate 400;

[0019] Figure 4 for Figure 3 sectional view of ;

[0020] Figure 5 A schematic diagram showing the fiber layup of the first composite material layer and the second composite material layer;

[0021] Figure 6 It is an exploded view of the three-layer structure of the base plate 400;

[0022] Reference numerals

[0023] Battery pack 100;

[0024] Battery cell 200;

[0025] Upper box 300;

[0026] Base plate 400;

[0027] A first composite material layer 410, a second composite material layer 420, and a metal layer 430;

[0028] Through hole 431. DETAILED DESCRIPTION

[0029] The following describes optional embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "distance", "width", "thickness", "up", "down", "left", "right", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this utility model, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0032] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] like Figure 1 As shown, the battery pack 100 includes a box body and a plurality of battery cells 200 disposed therein. The box body includes an upper box body 300 and a bottom plate 400 connected to the upper box body 300. The bottom plate 400 mainly supports the battery cells 200 and other components in the box body.

[0034] In order to improve the safety of the battery pack, such as Figure 2-6 As shown, the utility model provides a bottom plate 400, which includes a first composite material layer 410 located on the inner side, a second composite material layer 420 located on the outer side, and a metal layer 430 located between the first composite material layer 410 and the second composite material layer 420. The thickness of the first composite material layer 410 is less than the thickness of the second composite material layer 420. The first composite material layer 410 located on the inner side plays an insulating role, and the second composite material layer 420 located on the outer side plays an impact-proof and external corrosion-resistant role. When the total thickness of the bottom plate 400 remains unchanged, reducing the thickness of the first composite material layer 410 located on the inner side and increasing the thickness of the second composite material layer 420 located on the outer side can enhance the impact resistance and corrosion resistance of the outer side, thereby better protecting the battery cells 200 in the box and improving the safety of the battery pack 100.

[0035] In an optional embodiment of the present invention, the battery pack 100 further includes a thermal management component, which includes components such as a cold plate (not shown) and a water pipe. The cold plate is used to perform heat exchange with the battery cell 200, thereby performing thermal management on the battery cell 200 and preventing the battery cell 200 from being overcooled or overheated. Specifically, a channel may be provided in the cold plate, and the channel is used to inject a cooling medium. Specifically, the cold plate may be provided at the bottom of a plurality of battery cells 200, and the plurality of battery cells 200 are bonded to the cold plate by thermally conductive adhesive. A buffer (not shown) may be provided between the cold plate and the bottom plate 400. When the battery pack 100 is impacted, the buffer may absorb the impact force to prevent the battery cell 200 and the cold plate from being damaged. Alternatively, the cold plate may also be provided between two adjacent battery cells 200, and the battery cell 200 is bonded to the cold plate by thermally conductive adhesive.

[0036] In an optional embodiment of the present invention, as Figure 4 As shown, the thickness H1 of the first composite material layer 410 and the thickness H2 of the second composite material layer 420 satisfy the following: 0.2mm≤H1≤0.8mm, 0.8mm≤H2≤1.2mm. Setting H1 in the above numerical range can ensure that the first composite material layer 410 located on the inside has good insulation ability, and can also avoid the first composite material layer 410 being too thick and causing the energy density of the battery pack 100 to decrease. Setting H2 in the above numerical range can ensure that the second composite material layer 420 located on the outside has good resistance to external corrosion and impact, and can also avoid the second composite material layer 420 being too thick and causing the energy density of the battery pack 100 to decrease. Specifically, H1 can be 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, and H2 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm.

[0037] In an optional embodiment of the present invention, the thickness H3 of the metal layer 430 satisfies: 0.6 mm ≤ H3 ≤ 1.2 mm. Specifically, H3 can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, or 1.2 mm.

[0038] In an optional embodiment of the present invention, the material of the first composite material layer 410 includes at least one of continuous or discontinuous glass fiber, aramid fiber, basalt fiber, and carbon fiber. The first composite material layer 410 can be a reinforced thermoplastic composite material having a base material such as polypropylene, nylon, or nylon 66 mixed with at least one of the continuous or discontinuous glass fiber, aramid fiber, basalt fiber, and carbon fiber. Of course, the first composite material layer 410 can also be a reinforced thermosetting composite material having a base material such as epoxy resin or polyurethane mixed with at least one of the continuous or discontinuous glass fiber, aramid fiber, basalt fiber, and carbon fiber.

[0039] In an optional embodiment of the present invention, a foam material (not shown) is provided on the first composite material layer 410. The foam material can be directly foamed and formed on the first composite material layer 410, forming a single unit with the base plate 400, thereby improving the integration of the battery pack components. When the battery pack 100 is impacted, the foam material can provide a cushioning effect for components such as the battery cells 200 within the battery pack 100.

[0040] In an optional embodiment of the present invention, the material of the second composite material layer 420 includes at least one of continuous or discontinuous glass fibers, aramid fibers, basalt fibers, and carbon fibers. The second composite material layer 420 can be a reinforced thermoplastic composite material having a base material such as polypropylene, nylon, or nylon 66 mixed with at least one of the continuous or discontinuous glass fibers, aramid fibers, basalt fibers, and carbon fibers. Of course, the second composite material layer 420 can also be a reinforced thermosetting composite material having a base material such as epoxy resin or polyurethane mixed with at least one of the continuous or discontinuous glass fibers, aramid fibers, basalt fibers, and carbon fibers.

[0041] In an optional embodiment of the present invention, as Figure 5 As shown, the first composite material layer 410 and the second composite material layer 420 are both formed by laying out fiber layers, and the number of fiber layers included in the first composite material layer 410 is smaller than the number of fiber layers included in the second composite material layer 420 .

[0042] In an optional embodiment of the present invention, the material of the metal layer 430 includes at least one of steel and aluminum.

[0043] In an optional embodiment of the present invention, as Figure 6As shown, metal layer 430 is provided with through-holes 431, and first composite material layer 410 and second composite material layer 420 are bonded together at the locations of through-holes 431. The provision of through-holes 431 in metal layer 430 can increase the bonding area between first composite material layer 410 and second composite material layer 420, thereby improving the stability of the three-layer structure of base plate 400. Specifically, first composite material layer 410 and second composite material layer 420 can be bonded together at through-holes 431 using an adhesive, hot-melt bonding, or by providing an adhesive in the materials of first composite material layer 410 and second composite material layer 420 to impart self-adhesiveness, thereby bonding them together at through-holes 431. Figure 4 Only two through holes 431 are provided for exemplary purposes. The number, size and shape of the through holes 431 can be adjusted according to actual needs, and the present invention does not impose any restrictions thereon.

[0044] The utility model also provides a battery pack, wherein the box body of the battery pack further comprises a crossbeam, and the middle portion of the bottom plate is connected to the crossbeam.

[0045] The present invention also provides an electrical device, including a battery pack according to an optional embodiment. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. The spacecraft may include airplanes, rockets, space shuttles, and spacecraft.

[0046] Thus far, the technical solutions of the present invention have been described in conjunction with the optional embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A bottom plate for connecting to the upper box of a battery pack, characterized in that: The bottom plate includes a first composite material layer located on the inner side, a second composite material layer located on the outer side, and a metal layer located between the first composite material layer and the second composite material layer; the thickness of the first composite material layer is smaller than the thickness of the second composite material layer.

2. The base plate according to claim 1, wherein: The thickness H1 of the first composite material layer and the thickness H2 of the second composite material layer satisfy the following conditions: 0.2 mm ≤ H1 ≤ 0.8 mm, 0.8 mm ≤ H2 ≤ 1.2 mm.

3. The base plate according to claim 1, wherein: The thickness H3 of the metal layer satisfies: 0.6 mm ≤ H3 ≤ 1.2 mm.

4. The base plate according to claim 1, wherein: The material of the first composite material layer includes at least one of continuous or discontinuous glass fiber, aramid fiber, basalt fiber and carbon fiber.

5. The base plate according to claim 1, wherein: The material of the second composite material layer includes at least one of continuous or discontinuous glass fiber, aramid fiber, basalt fiber and carbon fiber.

6. The base plate according to claim 1, wherein The material of the metal layer includes at least one of steel and aluminum.

7. The bottom plate according to claim 1, wherein: The metal layer is provided with a through hole, and the first composite material layer and the second composite material layer are bonded at the position of the through hole.

8. A battery pack, characterized in that: The invention comprises a box body and a battery cell arranged in the box body, wherein the box body comprises an upper box body and a bottom plate, and the bottom plate is the bottom plate according to any one of claims 1 to 7.

9. The battery pack according to claim 8, wherein: The box body further includes a crossbeam, and the middle portion of the bottom plate is connected to the crossbeam.

10. The battery pack according to claim 8, wherein: The battery pack further includes a cold plate, which is disposed at the bottom of the battery cell. A buffer is disposed between the cold plate and the bottom plate.

11. The battery pack according to claim 10, wherein: The buffer component is formed by foaming on the first composite material layer.

12. An electrical device, characterized in that: Including the battery pack according to claim 8 or 11.

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