CN117199669A - Battery protection bottom plate, battery package composite protection structure and vehicle - Google Patents
Battery protection bottom plate, battery package composite protection structure and vehicle Download PDFInfo
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- CN117199669A CN117199669A CN202210612568.3A CN202210612568A CN117199669A CN 117199669 A CN117199669 A CN 117199669A CN 202210612568 A CN202210612568 A CN 202210612568A CN 117199669 A CN117199669 A CN 117199669A
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- fiber reinforced
- reinforced resin
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a battery protection bottom plate, which comprises an upper fiber reinforced resin layer, a metal plate, a fiber reinforced resin frame and a lower fiber reinforced resin layer, wherein the fiber reinforced resin frame is a frame structure formed by connecting a plurality of frame plates end to end, the metal plate and the fiber reinforced resin frame are positioned between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer, the metal plate is positioned in the fiber reinforced resin frame, the top surface of the fiber reinforced resin frame is integrally connected with the upper fiber reinforced resin layer, and the bottom surface of the fiber reinforced resin frame is integrally connected with the lower fiber reinforced resin layer; the metal plate and the fiber reinforced resin frame satisfy the following conditions:. Meanwhile, the invention also discloses a battery pack composite protection structure comprising the battery protection bottom plate and a vehicle. The battery protection bottom plate provided by the invention has better composite strength, and the integrity of the battery protection bottom plate after being impacted is improved.
Description
Technical Field
The invention belongs to the technical field of vehicle batteries, and particularly relates to a battery protection bottom plate, a battery pack composite protection structure and a vehicle.
Background
The battery pack of the new energy electric vehicle is usually arranged at the bottom of the vehicle, faces more complicated working conditions, is easy to be impacted by hard objects such as external stones and the like in the running process of the vehicle, and is usually required to be provided with certain protective measures at the bottom of the battery pack so as to avoid the problems of surface damage and electrolyte leakage caused by impact influence of the battery pack. The existing battery pack bottom protection scheme mainly protects the battery pack bottom by arranging a steel plate, corrosion of factors such as water vapor is avoided for the steel plate, the electrophoresis process is adopted for carrying out corrosion prevention treatment, in addition, as the bottom of the steel plate is directly exposed out of the bottom of a vehicle body, a PVC layer of 0.5-1.2mm needs to be sprayed on one side of the steel plate towards the ground to play a role of resisting stone impact, and meanwhile the purpose of preventing the electrophoresis layer from scraping is achieved, so that the corrosion prevention effect is improved.
However, in the existing battery pack bottom protection structure, the steel plate is subjected to vibration generated by impact to easily cause layering of the steel plate and the PVC layer, so that the anti-corrosion effect of the steel plate is affected, meanwhile, the steel plate is also easily cracked, and the protection effect of the battery pack is further affected.
Disclosure of Invention
Aiming at the problem that the existing battery bottom protection structure is prone to impact delamination and cracking, the invention provides a battery protection bottom plate, a battery pack composite protection structure and a vehicle.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the invention provides a battery protection bottom plate, which comprises an upper fiber reinforced resin layer, a metal plate, a fiber reinforced resin frame and a lower fiber reinforced resin layer, wherein the metal plate and the fiber reinforced resin frame are positioned between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer, the fiber reinforced resin frame is a frame structure formed by connecting a plurality of frame plates end to end, the metal plate is positioned in the fiber reinforced resin frame, the top surface of the fiber reinforced resin frame is integrally connected with the upper fiber reinforced resin layer, and the bottom surface of the fiber reinforced resin frame is integrally connected with the lower fiber reinforced resin layer; the metal plate and the fiber reinforced resin frame satisfy the following conditions:
wherein W is the width of the frame plate and the unit is mm;
l is the length of the metal plate in mm;
ρ 2 is the density of the metal plate, and the unit is g/cm 3 ；
d 2 The thickness of the metal plate is in mm;
σ 0 the tensile strength of the fiber reinforced resin frame is expressed in MPa;
ε 0 is the breaking elongation of the fiber reinforced resin frame.
Optionally, the metal plate and the fiber-reinforced resin frame satisfy the following conditions:
optionally, the width W of the frame plate is 30-200 mm.
Optionally, the length L of the metal plate is 1200-2200 mm.
Optionally, the density ρ of the metal plate 2 Is 2.7-8.5g/cm 3 。
Optionally, the thickness d of the metal plate 2 0.7-1.5 mm.
Optionally, the tensile strength sigma of the fiber reinforced resin frame 0 240-380 MPa.
Optionally, the fiber reinforced resin frame has an elongation at break ε 0 2.5 to 8 percent.
Optionally, the upper fiber reinforced resin layer, the metal plate and the lower fiber reinforced resin layer are all of a substantially square sheet structure;
the fiber reinforced resin frame is of a sheet-shaped approximately square frame structure.
Optionally, in the fiber reinforced resin frame, the widths of the plurality of frame plates are equal, or:
the width of the frame plate extending along the width direction of the fiber reinforced resin frame is greater than 1.2 times the width of the frame plate extending along the length direction of the fiber reinforced resin frame.
Optionally, a plurality of mounting holes are spaced apart from the inner side of the edge of the battery protection bottom plate, and the mounting holes sequentially penetrate through the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer.
Alternatively, the upper fiber-reinforced resin layer, the fiber-reinforced resin frame, and the lower fiber-reinforced resin layer are each independently selected from a glass fiber-reinforced polyamide resin member, a glass fiber-reinforced polypropylene resin member, a glass fiber-reinforced polyethylene resin member, a glass fiber-reinforced polycarbonate resin member, or a glass fiber-reinforced polystyrene resin member.
Optionally, the metal plate is a steel plate, and a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer is arranged on the outer surface of the steel plate.
In another aspect, the invention provides a battery pack composite protection structure, which comprises a battery pack and the battery protection bottom plate, wherein the battery protection bottom plate is arranged below the battery pack, and a buffer area is formed between the battery pack and the battery protection bottom plate.
Optionally, the buffer area is filled with a buffer layer, and the buffer layer is selected from honeycomb materials or hard foaming materials.
In another aspect, the present invention provides a vehicle comprising a battery protection floor as described above or a battery pack composite protection structure as described above.
According to the battery protection bottom plate provided by the invention, the upper fiber reinforced resin layer and the lower fiber reinforced resin layer are compounded on the front surface and the back surface of the metal plate, on one hand, the upper fiber reinforced resin layer and the lower fiber reinforced resin layer can improve the corrosion resistance of the metal plate, and meanwhile, the lower fiber reinforced resin layer can resist the impact of stones and the like on the bottom of the battery protection bottom plate, so that the corrosion problem of impact parts is avoided; on the other hand, the rigidity and the strength of the metal plate are effectively improved after the upper fiber reinforced resin layer and the lower fiber reinforced resin layer are compounded with the metal plate, and the metal plate has higher impact resistance. The periphery at the metal sheet is provided with fiber reinforced resin frame and connects the transition piece as last fiber reinforced resin layer and lower fiber reinforced resin layer's frame position, can effectively offset the influence that metal sheet thickness is connected last fiber reinforced resin layer and lower fiber reinforced resin layer frame, guarantees battery protection bottom plate's frame position intensity, and then is favorable to regard as its mounting structure on the battery package with battery protection bottom plate's frame position, improves its shock resistance.
Further, the metal plate is embedded in the middle of the fiber reinforced resin frame and is fixed by the upper fiber reinforced resin layer and the lower fiber reinforced resin layer, under normal working conditions, the overhang amount in the length direction of the metal plate is maximum, and when the metal plate is impacted, the stress in the length direction of the metal plate is larger and is largerDelamination is easy to occur or the metal plate is cracked; while the density, thickness and strength of the metal sheet are related to the strength of the metal sheet itself, the width, tensile strength and elongation at break of the frame sheet are related to its stability in mounting to the metal sheet. Therefore, in order to avoid the delamination and cracking problems of the battery protection chassis, the relation was summarized by the testWhen the width W of the frame plate, the length L of the metal plate and the density ρ of the metal plate are 2 Thickness d of the metal plate 2 Tensile Strength Sigma of the fiber reinforced resin frame 0 And elongation at break epsilon of said fiber reinforced resin frame 0 When satisfying above-mentioned condition, the vibration that the battery protection bottom plate can effectively bear the outside impact to produce avoids layering between last fiber reinforcement resin layer, the lower fiber reinforcement resin layer and the metal sheet, simultaneously, improves the support strength to its inside metal sheet, improves the integrality of battery protection bottom plate after the impact, guarantees the anticorrosion effect to the metal sheet.
Drawings
FIG. 1 is a schematic view of a battery protection chassis provided by the present invention;
FIG. 2 is a schematic illustration of the metal plate and fiber reinforced resin frame of the present invention;
FIG. 3 is a schematic view of the structure of a different first fiber reinforced prepreg unidirectional tape in the upper fiber reinforced resin layer provided by the invention;
FIG. 4 is a schematic view of the structure of a different first fiber woven cloth reinforced prepreg in an upper fiber reinforced resin layer provided by the invention;
fig. 5 is a schematic structural view of a composite protective structure for a battery pack according to the present invention;
FIG. 6 is an enlarged schematic view at A in FIG. 5;
FIG. 7 is a schematic bottom cross-sectional view of a battery pack composite protective structure according to an embodiment of the present invention;
fig. 8 is a schematic bottom cross-sectional view of a battery pack composite protective structure according to another embodiment of the present invention;
fig. 9 is a schematic bottom cross-sectional view of a battery pack composite protective structure according to another embodiment of the present invention.
Reference numerals in the drawings of the specification are as follows:
1. a battery protection base plate; 11. a fiber reinforced resin layer is arranged on the upper surface of the substrate; 111. a first fiber-reinforced prepreg unidirectional tape; 112. a first fiber woven cloth reinforced prepreg; 12. a metal plate; 13. a fiber reinforced resin frame; 14. A lower fiber reinforced resin layer; 15. a mounting hole; 2. a buffer layer; 3. a battery pack; 31. a tray; 4. a buffer.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Referring to fig. 1, an embodiment of the present invention provides a battery protection chassis 1, including an upper fiber reinforced resin layer 11, a metal plate 12, a fiber reinforced resin frame 13, and a lower fiber reinforced resin layer 14, wherein the metal plate 12 and the fiber reinforced resin frame 13 are located between the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14, the fiber reinforced resin frame 13 is a frame structure formed by connecting a plurality of frame plates 131 end to end, the metal plate 12 is located inside the fiber reinforced resin frame 13, the top surface of the fiber reinforced resin frame 13 is integrally connected with the upper fiber reinforced resin layer 11, and the bottom surface of the fiber reinforced resin frame 13 is integrally connected with the lower fiber reinforced resin layer 14; the metal plate 12 and the fiber reinforced resin frame 13 satisfy the following conditions:
wherein W is the width of the frame plate 131 in mm;
l is the length of the metal plate 12 in mm;
ρ 2 is the density of the metal plate 12 in g/cm 3 ；
d 2 Is the thickness of the metal plate 12 in mm;
σ 0 tensile strength in MPa for the fiber reinforced resin frame 13;
ε 0 is the breaking elongation of the fiber reinforced resin frame 13.
The upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14 are compounded on the front surface and the back surface of the metal plate 12, so that on one hand, the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14 can improve the corrosion resistance of the metal plate 12, and meanwhile, the lower fiber reinforced resin layer 14 can resist the impact of stones and the like on the bottom of the battery protection bottom plate 1, so that the corrosion problem of the impact part is avoided; on the other hand, the upper fiber-reinforced resin layer 11 and the lower fiber-reinforced resin layer 14 are combined with the metal plate 12 to effectively improve the rigidity and strength of the metal plate 12, and have higher impact resistance. The fiber reinforced resin frame 13 is arranged on the periphery of the metal plate 12 and serves as a frame position connecting transition piece of the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14, so that the influence of the thickness of the metal plate 12 on the frame connection of the upper fiber reinforced resin layer 11 and the lower fiber reinforced resin layer 14 can be effectively counteracted, the frame position strength of the battery protection bottom plate 1 is ensured, and the frame position of the battery protection bottom plate 1 is further facilitated to serve as an installation structure of the battery protection bottom plate on the battery pack 3, and the impact resistance of the battery protection bottom plate is improved.
Further, the metal plate 12 is embedded in the middle of the fiber reinforced resin frame 13 and is formed by the upper fiber reinforced resin layer11 and the lower fiber reinforced resin layer 14 are fixed, under normal working conditions, the overhang amount in the length direction of the metal plate 12 is maximum, and when the metal plate 12 is impacted, the stress in the length direction is larger, and layering phenomenon is more likely to occur or the metal plate 12 is likely to crack; while the density, thickness, and strength of the metal plate 12 are related to the strength of the metal plate 12 itself, the width, tensile strength, and elongation at break of the border plate 131 are related to the stability of its installation with respect to the metal plate 12. Therefore, in order to avoid the delamination and cracking problems of the battery protection chassis 1, the relation was summarized by the testWhen the width W of the frame plate 131, the length L of the metal plate 12, and the density ρ of the metal plate 12 are equal to 2 Thickness d of the metal plate 12 2 Tensile strength sigma of the fiber reinforced resin frame 13 0 And the elongation at break epsilon of the fiber reinforced resin frame 13 0 When the above conditions are satisfied, the battery protection bottom plate 1 can effectively bear vibration generated by external impact, avoid layering among the upper fiber reinforced resin layer 11, the lower fiber reinforced resin layer 14 and the metal plate 12, and simultaneously improve the supporting strength of the metal plate 12 inside the battery protection bottom plate 1, improve the integrity of the battery protection bottom plate 1 after being impacted, and ensure the anti-corrosion effect on the metal plate 12.
In some embodiments, the metal plate 12 and the fiber reinforced resin frame 13 satisfy the following conditions:
by defining the above relation, it is advantageous to integrate the width W of the frame plate 131, the length L of the metal plate 12, and the density ρ of the metal plate 12 2 Thickness d of the metal plate 12 2 Tensile strength sigma of the fiber reinforced resin frame 13 0 And the elongation at break epsilon of the fiber reinforced resin frame 13 0 And the like, on the impact strength of the battery protection bottom plate 1.
In some embodiments, the width W of the bezel 131 is 30 to 200mm.
Specifically, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.
Specifically, the width W of the frame plate 131 may be 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm or 200mm.
When the width W of the frame plate 131 is in the above range, the battery protection base plate 1 is made to have a proper installation area, effectively supporting and positioning the metal plate 12 in the middle thereof.
In some embodiments, the length L of the metal plate 12 is 1200-2200 mm.
In particular, the length L of the metal plate 12 may be 1200mm, 1400mm, 1500mm, 1600mm, 1700mm, 1800mm, 1900mm, 2000mm, 2100mm or 2200mm.
The length L of the metal plate 12 is determined according to the length of the battery pack 3 to be protected, so that the metal plate 12 can cover the bottom of the battery pack 3 as much as possible, and a good protection effect is achieved.
In some embodiments, the density ρ of the metal plate 12 2 Is 2.7-8.5g/cm 3 。
Specifically, the density ρ of the metal plate 12 2 Can be 2.7g/cm 3 、3.6g/cm 3 、4.8g/cm 3 、 5.0g/cm 3 、6.1g/cm 3 、6.7g/cm 3 、7.3g/cm 3 、7.5g/cm 3 、7.6g/cm 3 、7.8g/cm 3 、8.0g/cm 3 、 8.1g/cm 3 、8.2g/cm 3 、8.3g/cm 3 、8.4g/cm 3 Or 8.5g/cm 3 。
Density ρ of the metal plate 12 2 Can be adjusted by the selection of the material and specific model of the metal plate 12, and is related to the weight and mechanical strength of the metal plate 12 when the density ρ of the metal plate 12 is 2 When the weight is in the range, the mechanical strength is better, and the weight reduction control of the vehicle is facilitated.
In some embodiments, the thickness d of the metal plate 12 2 0.7-1.5 mm.
Specifically, the thickness d of the metal plate 12 2 May be 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.
Thickness d of the metal plate 12 2 When the tensile strength of the metal plate 12 is fixed, the protection strength of the battery protection bottom plate 1 is gradually increased along with the thickness increase of the metal plate 12, but the material cost is also gradually increased, and the ground clearance of the bottom of the vehicle is reduced. When the thickness d of the metal plate 12 is 2 When the distance between the battery protection bottom plate and the ground is within the range, the overall mechanical strength of the battery protection bottom plate 1 can be ensured, the cost can be effectively controlled, the distance between the battery protection bottom plate and the ground is ensured, and the vehicle weight control is facilitated.
In some embodiments, the tensile strength sigma of the fiber reinforced resin frame 13 0 240-380 MPa.
Specifically, the tensile strength σ of the fiber reinforced resin frame 13 0 May each be independently selected from 240MPa, 260MPa, 280MPa, 290MPa, 300MPa, 310MPa, 320MPa, 330MPa, 340MPa, 350MPa, 360MPa, 370MPa or 380MPa.
In some embodiments, the fiber reinforced resin frame 13 has an elongation at break ε 0 2.5 to 8 percent.
Specifically, the fiber reinforced resin frame 13 has an elongation at break ε 0 May be 2.5%, 2.6%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.8%, 3.9%, 4%, 4.3%, 5.4%, 6.5%, 6.6%, 7.8%, 7.9% or 8%.
Tensile strength sigma of the fiber reinforced resin frame 13 0 And elongation at break epsilon 0 The test can be carried out by a GB/T1447-2005 fiber reinforced plastic tensile property test method, the I-type sample is suitable for a fiber reinforced thermoplastic plate, the test is carried out by manufacturing the sample according to the I-type sample specified by national standard, and the limit reinforced resin frame is used as the mounting position of the battery protection bottom plate 1 and the metal plate12, the tensile strength sigma of the fiber reinforced resin frame 13 0 Is advantageous in that the deformation resistance of the fiber-reinforced resin frame 13 is improved; but with the tensile strength sigma of the fiber reinforced resin frame 13 0 The improvement of the battery protection bottom plate 1 can influence the elastic performance of the installation position of the battery protection bottom plate, so that the battery protection bottom plate is difficult to adapt to deformation caused by impact, and the problems of layering and fracture occur; when the tensile strength sigma of the fiber reinforced resin frame 13 0 When the deformation amount of the battery protection bottom plate 1 is within the above range, the deformation amount of the battery protection bottom plate 1 is favorably controlled when the battery protection bottom plate is impacted, and the problems of insufficient buffering effect and breakage of the battery protection bottom plate 1 are avoided.
In some embodiments, the upper fiber-reinforced resin layer 11, the metal plate 12, and the lower fiber-reinforced resin layer 14 are each of a substantially square sheet-like structure; the fiber reinforced resin frame 13 has a substantially square frame structure in the form of a sheet. It should be noted that the substantially square sheet-like structure and the substantially square sheet-like frame structure are the overall shape of which is square, and may be changed without affecting the overall shape of the sheet-like structure in some detail, for example, rounded corners may be disposed at the angular positions of the square, or protrusions or grooves may be disposed at the edges of the square, and the shape of the battery pack 3 may be better matched with the substantially square structure.
In some embodiments, the fiber reinforced resin frames 13 have the same width as the plurality of frame plates 131.
As shown in fig. 2, in some embodiments, in the fiber reinforced resin frame 13, the width of the border plate 131 extending in the width direction of the fiber reinforced resin frame 13 is greater than 1.2 times the width of the border plate 131 extending in the length direction of the fiber reinforced resin frame 13.
By increasing the width of the frame plate 131 extending in the width direction of the fiber reinforced resin frame 13, it is advantageous to improve the impact strength of the battery protection base plate 1 in the length direction.
As shown in fig. 6, in some embodiments, a plurality of mounting holes 15 are provided at intervals inside the edge of the battery protection base plate 1, and the mounting holes 15 pass through the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13, and the lower fiber reinforced resin layer 14 in order.
The mounting hole 15 is used for the installation fastening of battery protection bottom plate 1 in battery package 3 bottom, through with mounting hole 15 set up in the marginal inboard of battery protection bottom plate 1 and pass in proper order go up fiber-reinforced resin layer 11 fiber-reinforced resin frame 13 with lower fiber-reinforced resin layer 14, can avoid mounting hole 15 passes metal sheet 12 avoids metal sheet 12 to expose the corruption problem that leads to in mounting hole 15 department, simultaneously, fiber-reinforced resin frame 13 does benefit to the overall thickness and the tensile shear strength that improve the mounted position, has sufficient installation steadiness.
The plurality of mounting holes 15 are provided around the outer circumference of the metal plate 12 to uniformly disperse the top gravity and the bottom impact force received by the metal plate 12.
Specifically, during installation, a connecting piece is provided to pass through the installation hole 15 to fix the battery protection bottom plate 1 to the bottom of the battery pack 3, and the connecting piece is a rivet, a screw or a bolt.
In different embodiments, the resins of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13 and the lower fiber-reinforced resin layer 14 are each independently selected from thermosetting and/or thermoplastic materials. Examples may include, but are not limited to, epoxy resins, phenolics, phenols, cyanate esters, imides (e.g., polyimide, bismaleimide (BMI), polyetherimide), polypropylenes, polyesters, benzoxazines, polybenzimidazoles, polybenzothiazoles, polyamides, polyamideimides, polysulfones, polyethersulfones, polycarbonates, polyethylene terephthalate esters, and polyetherketones (e.g., polyetherketone (PEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), and the like), and combinations thereof.
In various embodiments, the fibers of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are each independently selected from glass fibers, aramid fibers, carbon fibers, graphite fibers, boron fibers, aramid fibers, and mixtures thereof.
The fibers of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 may be embedded in the resin in the form of chopped fibers, long chopped fibers, nonwoven fabrics, unidirectional reinforcing fiber substrates, woven fabrics, or the like.
In some embodiments, the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are each independently selected from a glass fiber-reinforced polyamide resin member or a glass fiber-reinforced polypropylene resin member, a glass fiber-reinforced polyethylene resin member, a glass fiber-reinforced polycarbonate resin member, or a glass fiber-reinforced polystyrene resin member.
In some embodiments, the fiber reinforced resin layer, the fiber reinforced resin frame 13 and the lower fiber reinforced resin layer 14 are made of the same resin material, and the same resin material can ensure the affinity of the materials between different layers, further ensure the integration degree between different layers, and improve the overall strength.
In some embodiments, the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14 are glass fiber-reinforced resin members, and the glass fiber-reinforced resin members contain 50% -70% of glass fibers, which is advantageous for improving the material strength of the upper fiber-reinforced resin layer 11, the fiber-reinforced resin frame 13, and the lower fiber-reinforced resin layer 14.
In some embodiments, the alkali content of the glass fiber is < 0.8%.
When the alkali content of the glass fibers is lower than 0.8%, the aging resistance of the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13 and the lower fiber reinforced resin layer 14 is improved, and the performance attenuation of the material after long-term use is slowed down.
In some embodiments, the glass fibers are selected from E glass fibers or S glass fibers.
In some embodiments, the upper fiber-reinforced resin layer 11 includes a plurality of first fiber-reinforced prepregs stacked on one another;
the fiber-reinforced resin frame 13 includes a plurality of layers of second fiber-reinforced prepregs stacked on each other;
the lower fiber-reinforced resin layer 14 includes a plurality of layers of third fiber-reinforced prepreg stacked one on another.
As shown in fig. 3, the upper fiber-reinforced resin layer 11 includes a plurality of first fiber-reinforced prepreg unidirectional tapes 111 stacked on each other, the fiber arrangement directions of two adjacent first fiber-reinforced prepreg unidirectional tapes 111 are staggered by approximately 90 °, and the allowable deviation range of the lay angles of the two adjacent first fiber-reinforced prepreg unidirectional tapes 111 is ±20°.
When the fibers in the first fiber reinforced prepreg unidirectional tape 111 are unidirectionally arranged and receive a tensile force along the extending direction of the fibers, the fibers in the first fiber reinforced prepreg unidirectional tape 111 can effectively bear the tensile force, and the stress uniformity of the upper fiber reinforced resin layer 11 in all directions is improved by staggering the fiber arrangement directions of the adjacent first fiber reinforced prepreg unidirectional tapes by approximately 90 degrees.
The fiber-reinforced resin frame 13 includes a plurality of layers of second fiber-reinforced prepreg unidirectional tapes stacked on each other, fibers in the second fiber-reinforced prepreg unidirectional tapes are unidirectionally arranged, the fiber arrangement directions of two adjacent layers of second fiber-reinforced prepreg unidirectional tapes are staggered by approximately 90 degrees, and the allowable deviation range of the lay angles of the two adjacent layers of second fiber-reinforced prepreg unidirectional tapes is +/-20 degrees.
The lower fiber-reinforced resin layer 14 includes a plurality of layers of third fiber-reinforced prepreg unidirectional tapes stacked on each other, the fibers in the third fiber-reinforced prepreg unidirectional tapes are unidirectionally arranged, the fiber arrangement directions of two adjacent layers of third fiber-reinforced prepreg unidirectional tapes are staggered by approximately 90 degrees, and the allowable deviation range of the lay angles of the two adjacent layers of third fiber-reinforced prepreg unidirectional tapes is +/-20 degrees.
The fiber arrangement of the fiber reinforced resin frame 13 and the lower fiber reinforced resin layer 14 is similar to that of the upper fiber reinforced resin layer 11, and will not be described again.
As shown in fig. 4, in another embodiment, the upper fiber-reinforced resin layer 11 includes a plurality of first fiber-woven cloth-reinforced prepregs 112 stacked on one another, and the fibers in the first fiber-woven cloth-reinforced prepregs 112 form woven cloth in a staggered form.
The fiber-reinforced resin frame 13 includes a plurality of layers of second fiber woven cloth reinforcement prepregs stacked on each other, and the fibers in the second fiber woven cloth reinforcement prepregs form woven cloth in a staggered form.
The lower fiber-reinforced resin layer 14 includes a plurality of layers of third fiber-woven cloth-reinforced prepregs stacked on each other, and the fibers in the third fiber-woven cloth-reinforced prepregs form woven cloth in a staggered form.
In some embodiments, the metal plate 12 is selected from the group consisting of iron and its alloys, aluminum and its alloys, magnesium and its alloys, copper and its alloys, titanium and its alloys, or nickel and its alloys.
In one embodiment, the metal plate 12 is a steel plate, and the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protection layer.
Compared with other metal materials, the metal plate 12 is made of a steel plate, has good tensile strength and elongation, can meet the requirement of impact resistance, and is beneficial to improving the protection effect on the battery pack 3.
The galvanized layer, the galvanized iron alloy layer or the electrophoretic paint protective layer is arranged on the outer surface of the steel plate and used for improving the corrosion resistance of the steel plate, when the upper fiber reinforced resin layer 11 or the fiber reinforced resin layer 14 is damaged, the galvanized layer or the galvanized iron alloy layer and the primary battery effect formed by the steel plate enable the galvanized layer or the galvanized iron alloy layer to be corroded preferentially to the steel plate, so that the steel plate is protected, and the electrophoretic paint protective layer has good adhesiveness and can effectively isolate the steel plate from the external environment.
As shown in fig. 5, another embodiment of the present invention provides a battery pack composite protection structure, which includes a battery pack 3 and a battery protection base plate 1 as described above, wherein the battery protection base plate 1 is disposed below the battery pack 3, and a buffer zone 4 is formed between the battery pack 3 and the battery protection base plate 1.
Due to the adoption of the battery protection bottom plate 1, the battery protection bottom plate 1 is effectively guaranteed to be stably connected with the battery pack 3 due to the protection strength of the battery protection bottom plate 1 and the battery protection bottom plate 1 under the condition of guaranteeing lower overall thickness.
In some embodiments, the battery pack 3 includes a tray 31 and batteries disposed on the tray 31.
In different embodiments, the buffer zone 4 may be arranged between the battery pack 3 and the battery protection chassis 1 in different ways.
As shown in fig. 7, in an embodiment, a bottom surface of the tray 31 is provided with a groove inwards to form the buffer zone 4, the battery protection bottom plate 1 is in a flat plate shape, and the battery protection bottom plate 1 covers the buffer zone 4.
As shown in fig. 8, in an embodiment, the frame of the battery protection base plate 1 is connected to the bottom surface of the tray 31, the bottom surface of the tray 31 is provided with a groove inwards, and the battery protection base plate 1 protrudes in a direction away from the tray 31, so as to form the buffer zone 4 between the tray 31 and the battery protection base plate 1.
As shown in fig. 9, in an embodiment, the frame of the battery protection base plate 1 is connected to the bottom surface of the tray 31, the bottom surface of the tray 31 is a plane, and the battery protection base plate 1 protrudes in a direction away from the tray 31, so as to form the buffer zone 4 between the tray 31 and the battery protection base plate 1.
In some embodiments, the buffer area 4 is filled with a buffer layer 2, and the buffer layer 2 is selected from a honeycomb material or a hard foam material.
The honeycomb material or the hard foaming material can absorb the crumple deformation space of the battery protection plate under the action of external strong impact, and absorb part of energy of the external strong impact in a buffering way, so that the battery protection bottom plate 1 is prevented from compressing deformation to impact the inner battery core of the battery pack 3, and the battery pack 3 is further protected.
In some embodiments, the honeycomb material is selected from PP honeycomb material or aluminum honeycomb material; the hard foaming material is selected from PU hard foaming material, PET hard foaming material, PMI hard foaming material, PVC hard foaming material, PET hard foaming material, MPP hard foaming material, PLA hard foaming material, PI hard foaming material or EPTU foaming material.
Another embodiment of the present invention provides a vehicle including the battery protection floor as described above or the battery pack composite protection structure as described above.
The invention is further illustrated by the following examples.
TABLE 1
Example 1
The embodiment is used for explaining the battery pack composite protective structure disclosed by the invention, and comprises a battery pack, a buffer layer and a battery protective bottom plate, wherein the battery protective bottom plate comprises a metal plate, an upper fiber reinforced resin layer, a fiber reinforced resin frame and a lower fiber reinforced resin layer, the metal plate is selected from galvanized steel plates, the metal plate is positioned between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer, the metal plate is positioned in the fiber reinforced resin frame, the top surface of the fiber reinforced resin frame is integrally connected with the upper fiber reinforced resin layer, and the bottom surface of the fiber reinforced resin frame is integrally connected with the lower fiber reinforced resin layer; the battery protection bottom plate is arranged below the battery pack, a buffer area is formed between the battery pack and the battery protection bottom plate, the buffer area is filled with the buffer layer, and the frame of the battery protection bottom plate is installed at the bottom frame position of the battery pack through rivets.
Wherein when the width W of the frame plate is 200mm, the length L of the metal plate is 1600mm, the density ρ of the metal plate is 2 7.9g/cm 3 Thickness d of the metal plate 2 A tensile strength sigma of 0.8mm of the fiber reinforced resin frame 0 Is 360MPa and the breaking elongation epsilon of the fiber reinforced resin frame 0 5.0%.
Examples 2 to 23
Examples 2 to 23 are for illustrating the battery pack composite protective structure disclosed in the present invention, including most of the structures in example 1, which are different in that:
the upper fiber-reinforced resin layer, the metal plate, and the lower fiber-reinforced resin layer provided in examples 2 to 23 in table 1 were employed.
Comparative examples 1 to 3
Comparative examples 1 to 3 are comparative illustrations of the battery pack composite protective structure disclosed in the present invention, including most of the structures in example 1, which are different in that:
the upper fiber-reinforced resin layer, the metal plate, and the lower fiber-reinforced resin layer provided in comparative examples 1 to 3 in table 1 were employed.
Performance testing
The following performance tests were performed on the battery pack composite protective structures provided in the above examples and comparative examples:
the ball is used as an impact head to impact the battery protection bottom plate of the battery pack composite protection structure so as to simulate the working condition that the bottom of the whole vehicle is impacted by foreign matters, the diameter of the ball is 25mm, the weight of the ball is 10kg, the impact energy is 300J, the impact speed is 8.5m/s, and the center point of the battery protection bottom plate and four points on the periphery of the center point are selected as impact points to impact for 5 times.
Measuring the concave deformation of the battery pack tray at each impact point, selecting the impact point with the largest concave deformation, and recording the impact point as the concave deformation of the battery pack tray; generally, the amount of dishing required for 300J energy impact is not higher than 3mm.
Measuring the diameter of a pulverization area of the battery protection bottom plate after being impacted by a vernier caliper, repeatedly measuring a single impact point three times, determining an average numerical value, selecting the impact point with the largest pulverization area diameter, and recording the impact point as the diameter of the pulverization area of the battery protection bottom plate; typically, the diameter of the region of pulverization is required to be no greater than 10mm.
And recording whether the battery is cracked after the battery protective bottom plate is impacted.
The test results obtained are filled in table 2.
TABLE 2
As can be seen from the test results of Table 1, the width W of the frame plate, the length L of the metal plate, and the density ρ of the metal plate 2 Thickness d of the metal plate 2 Tensile Strength Sigma of the fiber reinforced resin frame 0 And elongation at break epsilon of said fiber reinforced resin frame 0 Has a mutual correlation function in improving the impact resistance of the battery protection bottom plate when meeting the requirementAnd the obtained battery pack composite protective knot can adapt to the application condition of long-term impact working conditions.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (16)
1. The battery protection bottom plate is characterized by comprising an upper fiber reinforced resin layer, a metal plate, a fiber reinforced resin frame and a lower fiber reinforced resin layer, wherein the metal plate and the fiber reinforced resin frame are positioned between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer, the fiber reinforced resin frame is a frame structure formed by connecting a plurality of frame plates end to end, the metal plate is positioned in the fiber reinforced resin frame, the top surface of the fiber reinforced resin frame is integrally connected with the upper fiber reinforced resin layer, and the bottom surface of the fiber reinforced resin frame is integrally connected with the lower fiber reinforced resin layer; the metal plate and the fiber reinforced resin frame satisfy the following conditions:
wherein W is the width of the frame plate and the unit is mm;
l is the length of the metal plate in mm;
ρ 2 is the density of the metal plate, and the unit is g/cm 3 ；
d 2 The thickness of the metal plate is in mm;
σ 0 the tensile strength of the fiber reinforced resin frame is expressed in MPa;
ε 0 is the breaking elongation of the fiber reinforced resin frame.
2. The battery protection chassis of claim 1, wherein the metal plate and the fiber reinforced resin frame satisfy the following conditions:
3. the battery protection chassis of claim 1, wherein the width W of the frame plate is 30-200 mm.
4. The battery protection chassis of claim 1, wherein the length L of the metal plate is 1200-2200 mm.
5. The battery protection chassis of claim 1, wherein the metal plate has a density ρ of 2 Is 2.7-8.5g/cm 3 。
6. The battery protection chassis of claim 1, wherein the thickness d of the metal plate 2 0.7-1.5 mm.
7. The battery protection chassis of claim 1, wherein the fiber reinforced resin frame has a tensile strength σ 0 240-380 MPa.
8. The battery protection chassis of claim 1, wherein the fiber reinforced resin frame has an elongation at break ∈ 0 2.5 to 8 percent.
9. The battery protection chassis of claim 1, wherein the upper fiber reinforced resin layer, the metal plate, and the lower fiber reinforced resin layer are each of a generally square sheet-like structure;
the fiber reinforced resin frame is of a sheet-shaped approximately square frame structure.
10. The battery protection chassis of claim 9, wherein the plurality of border plates have equal widths in the fiber reinforced resin frame, or:
the width of the frame plate extending along the width direction of the fiber reinforced resin frame is greater than 1.2 times the width of the frame plate extending along the length direction of the fiber reinforced resin frame.
11. The battery protection chassis of claim 1, wherein a plurality of mounting holes are spaced apart inside an edge of the battery protection chassis, the mounting holes passing through the upper fiber reinforced resin layer, the fiber reinforced resin frame, and the lower fiber reinforced resin layer in sequence.
12. The battery protection chassis of claim 1, wherein the upper fiber reinforced resin layer, the fiber reinforced resin frame, and the lower fiber reinforced resin layer are each independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.
13. The battery protection base plate according to claim 1, wherein the metal plate is a steel plate, and a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protection layer is arranged on the outer surface of the steel plate.
14. A battery pack composite protective structure, which is characterized by comprising a battery pack and the battery protective bottom plate according to any one of claims 1-13, wherein the battery protective bottom plate is arranged below the battery pack, and a buffer area is formed between the battery pack and the battery protective bottom plate.
15. The battery pack composite protective structure according to claim 14, wherein the buffer area is filled with a buffer layer, and the buffer layer is selected from a honeycomb material or a hard foam material.
16. A vehicle comprising the battery protection floor according to any one of claims 1 to 13, or comprising the battery pack composite protection structure according to claim 14 or 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210612568.3A CN117199669A (en) | 2022-05-31 | 2022-05-31 | Battery protection bottom plate, battery package composite protection structure and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210612568.3A CN117199669A (en) | 2022-05-31 | 2022-05-31 | Battery protection bottom plate, battery package composite protection structure and vehicle |
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| CN117199669A true CN117199669A (en) | 2023-12-08 |
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| CN202210612568.3A Pending CN117199669A (en) | 2022-05-31 | 2022-05-31 | Battery protection bottom plate, battery package composite protection structure and vehicle |
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