Battery pack bottom protection plate protection structure, power battery system and electric vehicle

Abstract

The utility model discloses a battery pack bottom protection plate protection structure, which sequentially comprises a fiber reinforced composite plate shell, a honeycomb structure frame buffer layer and a water cooling plate from outside to inside, the honeycomb structure frame buffer layer is formed into a whole by stacking high-strength aluminum alloy pipes, and the high-strength aluminum alloy pipes are filled with internal fillers. And the internal filler is a foam material or a foam material with a non-Newtonian fluid property. The utility model further discloses a power battery system comprising the battery pack bottom protection plate protection structure and an electric automobile comprising the power battery system. The utility model has the following beneficial effects: 1, by utilizing a hierarchical strategy, the impact mechanical property of the structure is obviously enhanced, the weight of the structure is reduced, and the efficiency is improved; 2, the fiber reinforced composite board shell is high in specific energy absorption, flame-retardant, impact-resistant and low in density, and the weight of the protection structure is greatly reduced; and 3, by means of the manifold type micro-channel design, the original heat dissipation efficiency is reserved, and the thickness of the water cooling plate can be reduced.

Description

Technical Field

[0001] The utility model belongs to the field of electric vehicles, and particularly relates to a protection structure for the bottom guard plate of a battery pack, a power battery system and an electric vehicle. Background Technique

[0002] Chinese Utility Model Patent CN 219759782U discloses a lightweight battery system structure, including a box body, a box cover, a water-cooling plate, a module fixed to the box body and located above the water-cooling plate, a bottom guard plate installed at the bottom of the box body, and a buffer heat-insulating pad embedded between the water-cooling plate and the bottom plate. The module is composed of an end plate, battery cells and side plates. The battery cells are arranged front and back and fixed to each other, and then are constrained by the front and back end plates and the left and right side plates to form a whole. The water-cooling plate is composed of an upper cover plate, a water inlet joint, a water outlet joint and a flow channel plate. The upper cover plate of the water-cooling plate is welded to the flow channel plate. The flow channel plate is stamped with an inlet water flow channel and an outlet water flow channel. A first water path parallel point that divides the water path into two is provided at the water inlet position of the inlet water flow channel or the water outlet position of the outlet water flow channel. A second water path parallel point that divides the water path into two again is provided on one of the water paths after being divided into two at the first water path parallel point.

[0003] In the above technical solution, the structure of the bottom guard plate of the battery pack is, from outside to inside, the bottom guard plate - buffer heat-insulating pad - water-cooling plate, which are stacked together in a laminated structure. It mainly relies on the outer bottom guard plate to resist deformation and the buffer heat-insulating pad to absorb energy. The energy absorption path is single, and the overall anti-impact effect is average.

[0004] An electric vehicle (BEV) refers to a vehicle that uses an on-vehicle power source as power and drives the wheels with an electric motor, meeting the requirements of road traffic and safety regulations. The safety and high endurance of electric vehicles are two goals that need to be optimized simultaneously. Among them:

[0005] The safety of electric vehicles requires that the protection structure of the battery pack has sufficient anti-impact ability, which is usually achieved by increasing the thickness of the protection plate. However, this will inevitably increase the weight of the battery pack, thereby reducing the endurance mileage of the electric vehicle.

[0006] The high endurance of electric vehicles requires a greater energy density of the battery pack, and at the same time, it is necessary to reduce the weight of the vehicle body as much as possible.

[0007] In summary, there is a contradiction in the optimized design between the safety and high endurance of electric vehicles. It is necessary to propose a new and effective protection structure that can not only greatly improve the anti-impact performance of the structure but also reduce the overall weight to achieve efficiency improvement. Content of the Utility Model

[0008] Purpose of the utility model: The utility model makes improvements in view of the above problems existing in the prior art, that is, the utility model discloses a protection structure for the bottom guard plate of a battery pack, a power battery system and an electric vehicle.

[0009] Technical solution: A protective structure for the bottom guard plate of a battery pack, which sequentially includes a fiber-reinforced composite plate shell, a honeycomb structure frame buffer layer, and a water-cooled plate from outside to inside, where:

[0010] The honeycomb structure frame buffer layer is formed by stacking high-strength aluminum alloy tubes to form a whole. The high-strength aluminum alloy tubes are filled with internal fillers, and the internal fillers are foaming materials or foam materials with non-Newtonian fluid properties.

[0011] Further, the water-cooled plate is a manifold microchannel water-cooled plate.

[0012] Further, the thickness of the fiber-reinforced composite plate shell is 2 mm to 5 mm.

[0013] Further, the fiber-reinforced composite plate shell is integrally formed by laminating or molding reinforcing fibers and a matrix material, where:

[0014] The reinforcing fibers are one of glass fibers, carbon fibers, and aramid fibers.

[0015] Further, the honeycomb structure frame buffer layer is formed by stacking 2 to 5 layers of high-strength aluminum alloy tubes, and the height of a single layer of high-strength aluminum alloy tube is 0.5 mm to 5 mm.

[0016] Further, the internal fillers are one of foamed polyurethane, foamed polypropylene, foamed polyethylene, foamed polystyrene, and foams modified by non-Newtonian fluids.

[0017] Further, the protective structure of the bottom guard plate of the battery pack is an integrally formed part.

[0018] A power battery system includes a protective structure for the bottom guard plate of a battery pack according to any one of the above.

[0019] An electric vehicle includes the above-mentioned power battery system.

[0020] Beneficial effects: A protective structure for the bottom guard plate of a battery pack, a power battery system, and an electric vehicle disclosed by the present utility model have the following beneficial effects:

[0021] 1. By using a hierarchical strategy, the anti-impact mechanical properties of the structure are significantly enhanced, while the structure weight is reduced and the efficiency is improved - after the foaming material is foamed, a microporous structure is formed inside the honeycomb structure frame buffer layer, which is equivalent to a large metal honeycomb structure formed by stacking high-strength aluminum alloy tubes on the outside, and there are also small pore structures inside each high-strength aluminum alloy tube.

[0022] 2. The fiber-reinforced composite plate shell has a high specific energy absorption, is flame-retardant, impact-resistant, and has a low density. Compared with the steel plate of the traditional structure, without reducing the protection strength, the weight of the protection structure is greatly reduced.

[0023] 3. The internal design of the water-cooled plate has a manifold microchannel for extracting the heat of the battery pack. Through the design of the manifold microchannel, not only the original heat dissipation efficiency is retained, but also the thickness of the water-cooled plate can be reduced, further reducing the weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of the protection structure of the bottom protection plate of the battery pack.

[0025] Figure 2 It is a schematic three-dimensional structure view of the protection structure of the bottom protection plate of the battery pack.

[0026] Figure 3 It is a schematic view of the honeycomb structure frame and the internal filler of the buffer layer.

[0027] Wherein: 1 - fiber-reinforced composite plate shell

[0028] 2 - honeycomb structure frame buffer layer

[0029] 3 - internal filler

[0030] 4 - water-cooled plate DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following is a detailed description of the specific embodiments of the present invention.

[0032] The "range" disclosed in the present invention is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The range defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 10 - 50 is listed for a specific parameter, ranges of 10 - 40 and 20 - 50 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all contemplated: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4, and 2 - 5. In this application, unless otherwise specified, the numerical range "a - b" represents the abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0 - 5" means that all real numbers between "0 - 5" have been fully listed in this article, and "0 - 5" is only the abbreviated representation of these numerical combinations.

[0033] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0034] Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0035] Unless otherwise specified, all steps of the present application can be carried out in sequence or randomly, preferably in sequence. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0036] Unless otherwise specified, "including" and "comprising" mentioned in the present application mean open-ended or closed-ended. For example, "including" and "comprising" can mean that other components not listed can also be included or comprised, or only the components listed are included or comprised.

[0037] Unless otherwise specified, the reaction is carried out under normal temperature and normal pressure conditions.

[0038] Unless otherwise specified, all parts or percentages are parts by weight or percentages by weight.

[0039] In the present utility model, the substances used are all known substances and can be purchased or synthesized by known methods.

[0040] In the present utility model, the devices or equipment used are all conventional devices or equipment known in the art and can all be purchased. Specific Embodiment 1

[0042] As Figures 1-3 shown, a protection structure for the bottom guard plate of a battery pack includes, from outside to inside, a fiber-reinforced composite board shell 1, a honeycomb structure frame buffer layer 2, and a water-cooling plate 4, where:

[0043] The honeycomb structure frame buffer layer 2 is formed by stacking high-strength aluminum alloy tubes to form a whole. The high-strength aluminum alloy tubes are filled with an internal filler 3, and the internal filler 3 is a foaming material.

[0044] Further, the water-cooling plate 4 is a manifold-type microchannel water-cooling plate. The water-cooling plate 4 is made of an aluminum plate, and a manifold-type microchannel is designed inside for extracting the heat of the battery pack. Through the design of the manifold-type microchannel, the original heat dissipation efficiency is retained, and the thickness of the water-cooling plate can be reduced, further reducing the weight.

[0045] Further, the thickness of the fiber-reinforced composite plate housing 1 is 3.5 mm.

[0046] Further, the fiber-reinforced composite plate housing 1 is integrally formed by laminating reinforcing fibers and a matrix material, where:

[0047] The reinforcing fiber is a glass fiber. The fiber-reinforced composite plate housing 1 has a high specific energy absorption, is flame-retardant, impact-resistant, and has a low density. Compared with a steel plate of a traditional structure, without reducing the protection strength, the weight of the protection structure is significantly reduced.

[0048] Further, the honeycomb structure frame buffer layer 2 is stacked by 4 layers of high-strength aluminum alloy tubes, and the height of a single-layer high-strength aluminum alloy tube is 2 mm. The honeycomb structure frame buffer layer 2 is integrally stacked and manufactured by multiple layers of high-strength aluminum alloy tubes. The two ends of the high-strength aluminum alloy tube are open. One end of the high-strength aluminum alloy tube is the inlet of the internal filler 3, and the other end of the high-strength aluminum alloy tube is the outlet of the internal filler 3.

[0049] Further, the internal filler 3 is a foamed polyurethane. The foaming material is injected from one end of the high-strength aluminum alloy tube to fill the entire honeycomb structure frame buffer layer 2. After the foaming material raw material foams under certain temperature and pressure conditions, a microporous structure will be formed inside the high-strength aluminum alloy tube. It is equivalent to a large metal honeycomb structure formed by laminating high-strength aluminum alloy tubes on the outside, and there are also small pore structures inside each high-strength aluminum alloy tube. Using a hierarchical strategy, the mechanical properties of the structure are further enhanced.

[0050] Further, the battery pack bottom guard plate protection structure is an integrally formed part. The fiber-reinforced composite plate housing 1, the honeycomb structure frame buffer layer 2, and the water-cooling plate 4 are pressed into a whole through a hot pressing process to form the battery pack bottom guard plate protection structure.

[0051] A power battery system includes a battery pack bottom guard plate protection structure according to any one of the above.

[0052] An electric vehicle includes the above power battery system. Specific Embodiment 2

[0054] A battery pack bottom guard plate protection structure, from the outside to the inside, is successively a fiber-reinforced composite plate housing 1, a honeycomb structure frame buffer layer 2, and a water-cooling plate 4, where:

[0055] The honeycomb structure framework buffer layer 2 is formed by stacking high-strength aluminum alloy tubes to form an integral body. The high-strength aluminum alloy tubes are filled with an internal filler 3, and the internal filler 3 is a foaming material.

[0056] Further, the water-cooling plate 4 is a manifold microchannel water-cooling plate.

[0057] Further, the thickness of the fiber-reinforced composite plate housing 1 is 2 mm.

[0058] Further, the fiber-reinforced composite plate housing 1 is integrally formed by laminating reinforcing fibers and a matrix material, wherein:

[0059] The reinforcing fibers are carbon fibers.

[0060] Further, the honeycomb structure framework buffer layer 2 is formed by stacking 2 layers of high-strength aluminum alloy tubes, and the height of a single layer of high-strength aluminum alloy tube is 5 mm.

[0061] Further, the internal filler 3 is foamed polypropylene. In another embodiment, the internal filler 3 is foamed polyethylene. In another embodiment, the internal filler 3 is foamed polystyrene.

[0062] Further, the battery pack bottom guard plate protection structure is an integrally formed part.

[0063] A power battery system includes a battery pack bottom guard plate protection structure according to any one of the above.

[0064] An electric vehicle includes the above power battery system. Specific Embodiment 3

[0066] A battery pack bottom guard plate protection structure, from the outside to the inside, is successively a fiber-reinforced composite plate housing 1, a honeycomb structure framework buffer layer 2, and a water-cooling plate 4, wherein:

[0067] The honeycomb structure framework buffer layer 2 is formed by stacking high-strength aluminum alloy tubes to form an integral body. The high-strength aluminum alloy tubes are filled with an internal filler 3, and the internal filler 3 is a foam material with non-Newtonian fluid properties.

[0068] Further, the water-cooling plate 4 is a manifold microchannel water-cooling plate.

[0069] Further, the thickness of the fiber-reinforced composite plate housing 1 is 5 mm.

[0070] Further, the fiber-reinforced composite plate housing 1 is integrally formed by molding reinforcing fibers and a matrix material, wherein:

[0071] The reinforcing fibers are aramid fibers.

[0072] Furthermore, the honeycomb structure frame buffer layer 2 is stacked by 5 layers of high-strength aluminum alloy tubes, and the height of a single layer of high-strength aluminum alloy tube is 0.5 mm.

[0073] Furthermore, the internal filler 3 is a foam modified by non-Newtonian fluid.

[0074] Furthermore, the battery pack bottom guard plate protection structure is an integrally formed part.

[0075] A power battery system includes a battery pack bottom guard plate protection structure according to any one of the above.

[0076] An electric vehicle includes the above-mentioned power battery system.

[0077] The above has made a detailed description of the embodiments of the present invention. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A battery pack bottom guard plate protection structure, characterized in that: From outside to inside, it is fiber reinforced composite panel shell, honeycomb structure frame buffer layer and water cooling plate, among which: The honeycomb structure frame buffer layer is formed by stacking high-strength aluminum alloy tubes to form a whole. The high-strength aluminum alloy tubes are filled with internal fillers, and the internal fillers are foaming materials or foam materials with non-Newtonian fluid properties.

2. A battery pack bottom guard plate protection structure as claimed in claim 1, characterized in that: The water cooling plate is a manifold type microchannel water cooling plate.

3. A battery pack bottom guard plate protection structure as claimed in claim 1, characterized in that: The thickness of the fiber reinforced composite plate shell is 2 mm to 5 mm.

4. A battery pack bottom guard plate protection structure as claimed in claim 1, characterized in that: The fiber reinforced composite panel shell is formed by laminating or molding the reinforcing fibers and the matrix material in one piece, wherein: The reinforcing fiber is one of glass fiber, carbon fiber and aramid fiber.

5. A battery pack bottom guard plate protection structure as claimed in claim 1, characterized in that: The honeycomb structure frame buffer layer is formed by stacking 2 to 5 layers of high-strength aluminum alloy tubes, and the height of a single layer of high-strength aluminum alloy tube is 0.5 mm to 5 mm.

6. A battery pack bottom guard plate protection structure as claimed in claim 1, characterized in that: The internal filler is one of foamed polyurethane, foamed polypropylene, foamed polyethylene, foamed polystyrene and foam modified by non-Newtonian fluid.

7. A battery pack bottom guard plate protection structure as claimed in claim 1, characterized in that: The battery pack bottom guard plate protection structure is an integrally formed part.

8. A power battery system, characterized in that: A battery pack bottom guard plate protection structure comprising the one described in any one of claims 1-7.

9. An electric vehicle, characterized in that: Including the power battery system as described in claim 8.

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