CN117199668A - 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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- CN117199668A CN117199668A CN202210612543.3A CN202210612543A CN117199668A CN 117199668 A CN117199668 A CN 117199668A CN 202210612543 A CN202210612543 A CN 202210612543A CN 117199668 A CN117199668 A CN 117199668A
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- reinforced resin
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- 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 metal plate and the fiber reinforced resin frame are positioned on the upper fiber reinforced resin layer and the lower fiber reinforced resin layerThe battery protection bottom plate comprises a lower fiber reinforced resin layer, wherein the lower fiber reinforced resin layer is a frame body structure formed by connecting a plurality of frame plates end to end, the metal plate is positioned inside the fiber reinforced resin frame, a plurality of mounting holes are formed in the inner side of the edge of the battery protection bottom plate at intervals, and the battery protection bottom plate meets the following conditions: 0.4 < D +.lg (D) 0 *W/L)/L 2 And is less than or equal to 2. 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 is beneficial to avoiding the problem that the connecting piece is loosened and layered under the working condition of long-term vibration.
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
With the rapid development of electric vehicles, the safety requirements of people on the electric vehicles are also higher and higher, and the importance of the safety of the power battery pack serving as a power source of the electric vehicles is self-evident. In electric automobile, the battery package is located the chassis lower part of vehicle generally, is connected with the chassis through the bolt, and the lower surface of battery package exposes outside, and the battery package bottom is bumped easily in the vehicle daily driving process and is led to the box to break protection inefficacy, and the bottom stone splashes in the driving process also can cause the impact to the battery package, in order to face complicated operating mode, is provided with the guard plate in the bottom of battery package generally, plays the guard plate to the bottom of battery package through the guard plate. Meanwhile, vibration is inevitably generated in the running process of the vehicle, and the problems that the connecting rivet loosens or the surface protection layer falls off easily occur under the long-term vibration and impact actions of the existing protection plate.
Disclosure of Invention
Aiming at the problems that rivets are loosened or a surface protective layer is detached from an existing battery pack protective plate, the invention provides a battery protective bottom plate, a battery pack composite protective 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 inside interval of edge of battery protection bottom plate is equipped with a plurality of mounting holes, the mounting hole passes in proper order last fiber-reinforced resin layer fiber-reinforced resin frame with lower fiber-reinforced resin layer, battery protection bottom plate satisfies following condition:
0.4≤-D*lg(d 0 *W/L)/L 2 ≤2
wherein D is the diameter of the mounting hole, and the unit is mm;
d 0 the unit is mm for the total thickness of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer;
w is the width of the frame plate, and the unit is mm;
l is the length of the metal plate in mm;
L 2 the shortest distance between the edge of the mounting hole and the edge of the battery protection bottom plate is in mm.
Optionally, the battery protection bottom plate meets the following conditions:
0.45≤-D*lg(d 0 *W/L)/L 2 ≤1.7。
optionally, the diameter D of the mounting hole is 4.5-10 mm.
Optionally, the total thickness d of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer 0 Is 1.6-4.0 mm.
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 shortest distance L between the edge of the mounting hole and the edge of the battery protection bottom plate 2 4-15 mm.
Optionally, the distance between two adjacent mounting holes is 60-140 mm.
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 upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer are all glass fiber reinforced resin pieces, the glass fiber reinforced resin pieces contain 50% -70% of glass fibers, and the alkali content of the glass fibers is less than 0.8%.
Optionally, the upper fiber reinforced resin layer includes a plurality of first fiber reinforced prepregs stacked on each other;
the fiber reinforced resin frame comprises a plurality of layers of second fiber reinforced prepregs which are mutually laminated;
the lower fiber-reinforced resin layer includes a plurality of layers of third fiber-reinforced prepregs stacked one on another.
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 protective floor or a battery pack composite protective 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.
Further, the frame position of the battery protection bottom plate is used for installing the battery protection bottom plate at the bottom of the battery pack, so that the installation stability of the battery protection bottom plate and the amplitude intensity generated when the battery protection bottom plate is impacted are affected. The inventors found through a large number of experiments that the diameter D of the mounting hole, the total thickness D of the upper fiber-reinforced resin layer, the fiber-reinforced resin frame and the lower fiber-reinforced resin layer 0 The width W of the frame plate, the length L of the metal plate and the shortest distance L between the edge of the mounting hole and the edge of the battery protection bottom plate 2 The conditions are satisfied: 0.4 < D +.lg (D) 0 *W/L)/L 2 When the vibration intensity of the battery protection bottom plate is smaller than or equal to 2, the vibration intensity of the battery protection bottom plate is reduced when the battery protection bottom plate is impacted, the problem that a connecting piece of the battery protection bottom plate is loosened under a long-term vibration working condition is avoided, and meanwhile layering phenomena among the upper fiber reinforced resin layer, the metal plate and the lower fiber reinforced resin layer are reduced.
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; 131. A frame plate; 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, 2 and 6, an embodiment of the present invention provides a battery protection chassis 1, which includes 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 inside of the edge of the battery protection base plate 1 is provided with a plurality of mounting holes 15 at intervals, the mounting holes 15 sequentially penetrate through the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13 and the lower fiber reinforced resin layer 14, and the battery protection base plate 1 meets the following conditions:
0.4≤-D*lg(d 0 *W/L)/L 2 ≤2
wherein D is the diameter of the mounting hole 15 in mm;
d 0 the unit is mm for the total thickness of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer;
w is the width of the frame plate, and the unit is mm;
l is the length of the metal plate 12 in mm;
L 2 the shortest distance between the edge of the mounting hole 15 and the edge of the battery protection base plate 1 is expressed in mm.
As shown in FIG. 6, the shortest distance L between the edge of the mounting hole and the edge of the battery protection bottom plate 2 Specifically, the method comprises the following steps: two points are respectively selected from the edge of the mounting hole 15 and the edge of the battery protection bottom plate 1, and the shortest connecting line length between the two points is the shortest distance L between the edge of the mounting hole and the edge of the battery protection bottom plate 2 。
In the above-described relational expression, the length L of the metal plate 12 is the length of the longer side of the metal plate 12.
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 overall thickness and tensile shear strength of the mounting position are improved, the frame position strength of the battery protection bottom plate 1 is ensured, the frame position of the battery protection bottom plate 1 is further facilitated to serve as a mounting structure of the battery protection bottom plate 1 on a battery, and the impact resistance of the battery protection bottom plate is improved.
The mounting holes 15 are used for mounting and fastening the battery protection bottom plate 1 at the bottom of the battery pack 3, and the mounting holes 15 are arranged on the inner side of the edge of the battery protection bottom plate 1 and sequentially penetrate through the upper fiber reinforced resin layer 11, the fiber reinforced resin frame 13 and the lower fiber reinforced resin layer 14, so that the mounting holes 15 can be prevented from penetrating through the metal plate 12, and corrosion problems caused by exposure of the metal plate 12 at the mounting holes 15 can be avoided.
The frame position of the battery protection bottom plate 1 is used for installing the battery protection bottom plate 1 at the bottom of the battery pack 3, so that the installation stability of the battery protection bottom plate 1 and the amplitude intensity generated when the battery protection bottom plate 1 is impacted are affected.
The inventors found through a large number of experiments that the diameter D of the mounting hole 15, the total thickness D of the upper fiber-reinforced resin layer, the fiber-reinforced resin frame, and the lower fiber-reinforced resin layer 0 The width W of the frame plate, the length L of the metal plate 12 and the shortest distance L between the edge of the mounting hole 15 and the edge of the battery protection bottom plate 1 2 The conditions are satisfied: 0.4 < D +.lg (D) 0 *W/L)/L 2 And when the vibration intensity of the battery protection bottom plate 1 is smaller than or equal to 2, the vibration intensity is favorably reduced when the battery protection bottom plate is impacted, the problem that a connecting piece is loosened under a long-term vibration working condition is avoided, and meanwhile, the layering phenomenon among the upper fiber reinforced resin layer 11, the metal plate 12 and the lower fiber reinforced resin layer 14 is reduced.
In some embodiments, the battery protection chassis 1 satisfies the following conditions:
0.45≤-D*lg(d 0 *W/L)/L 2 ≤1.7。
by the definition of the above relation, it is advantageous to integrate the diameter D of the mounting hole 15, the total thickness D of the upper fiber-reinforced resin layer, the fiber-reinforced resin frame, and the lower fiber-reinforced resin layer 0 A width W of the frame plate, a length L of the metal plate 12 andshortest distance L between edge of mounting hole 15 and edge of battery protection bottom plate 1 2 And the battery protection bottom plate 1 has high stability due to the influence of factors such as vibration resistance and shock resistance on the battery protection bottom plate 1.
In some embodiments, a plurality of the mounting holes 15 are disposed around the periphery of the metal plate 12 to uniformly disperse the top gravity and the bottom impact force applied to 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 some embodiments, the diameter D of the mounting hole 15 is 4.5-10 mm.
Specifically, the diameter D of the mounting hole 15 may be 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm.
The diameter D of the mounting hole 15 is related to the stress of the battery protection bottom plate 1 at the mounting position, along with the increase of the diameter D of the mounting hole 15, the stress area of the mounting position of the battery protection bottom plate 1 is increased under vibration and impact conditions, meanwhile, the overall strength of the frame position of the battery protection bottom plate 1 is reduced due to the increase of the area occupation ratio of the mounting hole 15 on the battery protection bottom plate 1, and when the diameter D of the mounting hole 15 is in the range, the problem of stress concentration can be avoided, the influence on the strength of the frame position of the battery protection bottom plate 1 is reduced, and the impact strength is improved.
In some embodiments, the total thickness d of the upper fiber-reinforced resin layer, the fiber-reinforced resin frame, and the lower fiber-reinforced resin layer 0 Is 1.6-4.0 mm.
Specifically, the total thickness d of the upper fiber-reinforced resin layer, the fiber-reinforced resin frame and the lower fiber-reinforced resin layer 0 May be 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.3mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.3mm, 3.5mm, 3.6mm, 3.8mm, 3.9mm or 4.0mm.
The upper fiber is increasedTotal thickness d of strong resin layer, fiber-reinforced resin frame and lower fiber-reinforced resin layer 0 Affecting the mechanical strength of the battery protection bottom plate 1 at the frame position, when the total thickness d of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer 0 When the mechanical strength of the battery protection bottom plate 1 at the frame position is increased, the material cost of the battery protection bottom plate is correspondingly increased, and the ground clearance is increased; when the total thickness d of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer 0 When the support is in the range, the support can have a good support stabilizing effect on the basis of ensuring the thinness and thinness as much as possible.
In some embodiments, the width W of the frame plate is 30-200 mm.
Specifically, the width W of the frame plate 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 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 shortest distance L between the edge of the mounting hole 15 and the edge of the battery protection base plate 1 2 4-15 mm.
Specifically, the shortest distance L between the edge of the mounting hole 15 and the edge of the battery protection bottom plate 1 2 May be 4mm, 5mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm or 15mm.
The mounting hole 1The part between the edge 5 and the edge of the battery protection bottom plate 1 is used for bearing the stretching force of the battery protection bottom plate 1 when being impacted, and when the shortest distance L between the edge of the mounting hole 15 and the edge of the battery protection bottom plate 1 is the shortest 2 In the above range, it is advantageous to maintain the stability of the shape of the edge position of the battery protection chassis 1 when receiving an impact, and to avoid deformation of the mounting holes 15.
In some embodiments, the spacing between two adjacent mounting holes 15 is 60-140 mm.
When the distance between two adjacent mounting holes 15 is in the above range, the fixing of the frame position of the battery protection bottom plate 1 can be ensured, the problem of gaps between the mounting holes 15 caused by overlarge distance between the mounting holes 15 is avoided, and the impact force is well dispersed.
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 upper fiber reinforced resin layer 11, 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, thereby ensuring the integration degree between different layers and improving 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, in an embodiment, 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 angle of 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 some embodiments, the metal sheet 12 is a steel sheet, and the outer surface of the steel sheet 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 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 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 battery protection bottom plate sets up in the below of battery package, the battery package with be formed with the buffer between the battery protection bottom plate, it has to fill in the buffer, just a plurality of mounting holes have been seted up to the frame position of battery protection bottom plate, the bottom of battery package is provided with the tray, pass through the rivet the mounting hole with battery protection bottom plate install in the bottom frame position of tray.
Wherein the diameter D of the mounting hole is 10mm, and the total thickness D of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer 0 Is 2.6mm, the width W of the frame plate is 100mm, the length L of the metal plate is 1600mm, and the shortest distance L between the edge of the mounting hole and the edge of the battery protection bottom plate 2 Is 5mm.
Examples 2 to 19
Examples 2 to 19 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 battery protection chassis design parameters provided in examples 2-19 of table 1 were used.
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 battery protection chassis design parameters provided in comparative examples 1-3 of table 1 were used.
Performance testing
The following performance tests were performed on the battery pack composite protective structures provided in the above examples and comparative examples:
and installing the battery pack composite protection structure on a vibrating table, and performing 30w mileage simulation vibration.
30w mileage simulation vibration test: according to the requirements of GB/T2423.43, a test object is mounted on a vibrating table, and the torque of each mounting point is tested and recorded. Vibration testing was performed in three directions, with reference to GB/T2423.56, and specific test conditions were as follows:
firstly, randomly vibrating for 21h in the Z direction (random vibration conditions are shown in table 2), and then vibrating for 1h in the Z direction at fixed frequency (fixed frequency vibration conditions: 24Hz fixed frequency, 1g fixed frequency amplitude);
next, randomly vibrating for 21h in the Y direction (random vibration conditions are shown in table 2), and then vibrating for 1h in the Y direction (fixed frequency vibration conditions: 24Hz fixed frequency, 1g fixed frequency amplitude);
further, the vibration was randomly conducted for 21h in the X direction (random vibration conditions are shown in Table 2), and then the vibration was conducted for 1h in the X direction (fixed frequency vibration conditions: 24Hz fixed frequency, 1g fixed frequency amplitude).
Wherein PSD represents power spectral density, represents power spectral density of vibration at a certain frequency; the r.m.s. value represents the integrated acceleration of the vibration, and the vibration intensity is fed back.
Table 2 random vibration test
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The diameters of a plurality of mounting holes after vibration are detected by adopting a vernier caliper, the average value is taken, the average diameter of the mounting holes after vibration is obtained, the diameter D of the mounting holes is used as the average diameter of the mounting holes before vibration, and the size increment percentage of the mounting holes after vibration is calculated by the following formula:
percentage increase in post-vibration mounting hole size= (average diameter of post-vibration mounting hole-average diameter of pre-vibration mounting hole)/diameter of pre-vibration mounting hole ×100%
And recording the situation of rivet installation after vibration and the situation of tearing of a battery protection bottom plate around the rivet.
The test results obtained are filled in Table 3.
TABLE 3 Table 3
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As can be seen from the test results of Table 3, by limiting the diameter D of the mounting hole, the total thickness D of the upper fiber-reinforced resin layer, the fiber-reinforced resin frame and the lower fiber-reinforced resin layer 0 The width W of the frame plate, the length L of the metal plate and the shortest distance L between the edge of the mounting hole and the edge of the battery protection bottom plate 2 In the relation of 0.4 < D +.lg (D) 0 *W/L)/L 2 In the range of less than or equal to 2, the installation stability of the battery protection bottom plate can be effectively ensured, and the problems of size expansion, lamination of a composite structure and loosening of rivets caused by poor hole site durability are avoided.
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 (15)
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 inside interval of edge of battery protection bottom plate is equipped with a plurality of mounting holes, the mounting hole passes in proper order last fiber-reinforced resin layer fiber-reinforced resin frame with lower fiber-reinforced resin layer, battery protection bottom plate satisfies following condition:
0.4≤-D*lg(d 0 *W/L)/L 2 ≤2
wherein D is the diameter of the mounting hole, and the unit is mm;
d 0 the unit is mm for the total thickness of the upper fiber reinforced resin layer, the fiber reinforced resin frame and the lower fiber reinforced resin layer;
w is the width of the frame plate, and the unit is mm;
l is the length of the metal plate in mm;
L 2 the shortest distance between the edge of the mounting hole and the edge of the battery protection bottom plate is in mm.
2. The battery protection chassis of claim 1, wherein the battery protection chassis meets the following conditions:
0.45≤-D*lg(d 0 *W/L)/L 2 ≤1.7。
3. the battery protection chassis of claim 1, wherein the mounting hole has a diameter D of 4.5-10 mm.
4. The battery protection chassis of claim 1, wherein the total thickness d of the upper fiber reinforced resin layer, the fiber reinforced resin frame, and the lower fiber reinforced resin layer 0 Is 1.6-4.0 mm.
5. The battery protection chassis of claim 1, wherein the width W of the frame plate is 30-200 mm.
6. The battery protection chassis of claim 1, wherein the length L of the metal plate is 1200-2200 mm.
7. The battery protection chassis of claim 1, wherein the shortest distance L between the mounting hole edge and the battery protection chassis edge 2 4-15 mm.
8. The battery protection chassis of claim 1, wherein the spacing between adjacent two of the mounting holes is 60-140 mm.
9. 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.
10. 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 all glass fiber reinforced resin members containing 50% to 70% glass fibers having an alkali content of < 0.8%.
11. The battery protection chassis of claim 1, wherein the upper fiber reinforced resin layer comprises a plurality of layers of first fiber reinforced prepreg stacked on top of each other;
the fiber reinforced resin frame comprises a plurality of layers of second fiber reinforced prepregs which are mutually laminated;
the lower fiber-reinforced resin layer includes a plurality of layers of third fiber-reinforced prepregs stacked one on another.
12. 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.
13. 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 1-12, 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.
14. The battery pack composite protective structure according to claim 13, 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.
15. A vehicle comprising the battery protection floor panel according to any one of claims 1 to 12, or the battery pack composite protection structure according to claim 13 or 14.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210612543.3A CN117199668A (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 |
|---|---|---|---|
| CN202210612543.3A CN117199668A (en) | 2022-05-31 | 2022-05-31 | Battery protection bottom plate, battery package composite protection structure and vehicle |
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| CN117199668A true CN117199668A (en) | 2023-12-08 |
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| CN202210612543.3A Pending CN117199668A (en) | 2022-05-31 | 2022-05-31 | Battery protection bottom plate, battery package composite protection structure and vehicle |
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