Battery box, vehicle and preparation method of battery box

Abstract

The invention provides a battery box, a vehicle and a preparation method of the battery box. The battery box comprises a box body and an upper cover, the box body and the upper cover jointly define a containing cavity for containing a battery, at least one of the box body and the upper cover is prepared from a modified glass fiber composite material, and the modified glass fiber composite material comprises, by mass, 40-60 parts of polyphenyl ether; 20 to 25 parts by mass of styrene; 5-8 parts by mass of a compatilizer; 3-5 parts by mass of a plasticizer; 4-5 parts by mass of a flame retardant; 5-7 parts by mass of a solvent-resistant agent; 18 to 20 parts by mass of glass fiber; 0.2 part by mass of an antioxidant; 0.2 part by mass of a lubricant; 0.2 part by mass of a scratch-resistant agent; and 0.1 part by mass of a light stabilizer. The battery box is good in flame retardance, and can meet the requirements of light weight, high strength and random vibration.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular, to a battery box, a vehicle, and a method for preparing the battery box. Background Art

[0002] Glass fiber reinforced thermoplastic composites are a type of composite materials with superior performance made of inorganic and organic materials. They have excellent mechanical properties (such as high stiffness and strength), heat resistance, long service life, and can be recycled.

[0003] However, PA6 (nylon 6) as an organic material has a significant disadvantage in terms of flammability. PA6 burns quickly in flames, and produces a large number of flaming droplets, which increases the spread of fire. Therefore, this material must be modified to be flame retardant. Summary of the Invention

[0004] The present application provides a battery box, a vehicle, and a method for preparing the battery box, which have good flame retardancy and can meet the requirements of lightweight, high strength, and random vibration.

[0005] A battery box, comprising a box body and an upper cover, wherein the box body and the upper cover together form a receiving cavity for receiving batteries, and at least one of the box body and the upper cover is made of a modified glass fiber composite material, wherein the modified glass fiber composite material comprises:

[0006] Polyphenylene ether: 40-60 parts by mass;

[0007] Styrene: 20-25 parts by mass;

[0008] Compatibilizer: 5-8 parts by mass;

[0009] Plasticizer: 3-5 parts by mass;

[0010] Flame retardant: 4-5 parts by mass;

[0011] Solvent resistance: 5-7 parts by mass;

[0012] Glass fiber: 18-20 parts by mass;

[0013] Antioxidant: 0.2 parts by mass;

[0014] Lubricant: 0.2 parts by mass;

[0015] Scratch resistant agent: 0.2 parts by mass;

[0016] Light stabilizer: 0.1 parts by mass

[0017] Optionally, the compatibilizer is selected from one or more combinations of styrene-maleic anhydride copolymer, maleic anhydride grafted polypropylene, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, etc.; and / or

[0018] The plasticizer is selected from one or a combination of triphenyl phosphate and dihydroxydiphenyl sulfide; and / or

[0019] The flame retardant is a styrene-propylene copolymer of a phosphate ester; and / or

[0020] The solvent-resistant polymer is selected from one or more combinations of polypropylene, styrene-acrylonitrile copolymer or acrylonitrile, butadiene and styrene copolymer; and / or

[0021] The glass fiber is 2400tex glass fiber; and / or

[0022] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; and / or

[0023] The light stabilizer is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0024] Optionally, the upper cover includes a cover plate and an annular upper cover wall connected to the edges of the cover plate. The cover plate and the upper cover wall together enclose a portion of the receiving cavity.

[0025] The inner surface of the cover plate facing the receiving cavity is provided with cross-arranged first reinforcing ribs, and the inner surface of the upper cover wall facing the receiving cavity is provided with upper cover positioning ribs for cooperating with the box body for positioning, and the upper cover positioning ribs are also connected to the first reinforcing ribs.

[0026] Optionally, the upper cover surrounding wall includes a first upper cover side wall and a second upper cover side wall relative to each other, and the upper cover positioning ribs include a first positioning rib and a second positioning rib provided on the first upper cover side wall and protruding toward the second upper cover side wall, and a third positioning rib and a fourth positioning rib provided on the second upper cover side wall and protruding toward the first upper cover side wall, the first positioning rib and the second positioning rib are spaced apart and parallel, the third positioning rib and the fourth positioning rib are spaced apart and parallel, and the first positioning rib, the second positioning rib, the third positioning rib and the fourth positioning rib all cooperate with the box body for positioning.

[0027] Optionally, the first positioning rib and the second positioning rib are connected via a first connecting rib, and the first connecting rib is also connected to the cover plate. The first positioning rib, the second positioning rib and the first connecting rib are combined to form a box structure.

[0028] Optionally, the third positioning rib is connected to the fourth positioning rib via a second connecting rib, and the second connecting rib is further connected to the cover plate. The third positioning rib, the fourth positioning rib and the second connecting rib are combined to form a box structure.

[0029] Optionally, the upper cover wall is provided with a plurality of spaced-apart connecting portions and a plurality of second reinforcing ribs, the connecting portions being used for detachable connection with the box body, and at least one of the connecting portions is also connected to the second reinforcing ribs.

[0030] Optionally, the box body includes a bottom plate and an annular box body wall connected to the edges of the bottom plate. The bottom plate and the box body wall together enclose a portion of the receiving cavity. The box body is provided with box body positioning ribs for defining the placement space of the battery cell.

[0031] Optionally, the box positioning rib protrudes from the inner surface of the box wall and extends along the height direction of the box. The bottom end of the box positioning rib is connected to the bottom plate. In the height direction of the box, the box positioning rib is set to a variable cross-section structure, and the cross-sectional area of ​​the bottom of the box positioning rib is larger than the cross-sectional area of ​​the top of the box positioning rib.

[0032] Optionally, the box body wall includes a first box body side wall and a second box body side wall relative to each other, and a plurality of box body positioning ribs are provided, which are respectively arranged on the first box body side wall and the second box body side wall. The box body positioning ribs arranged on the first box body side wall are parallel and spaced apart, and the box body positioning ribs arranged on the second box body side wall are parallel and spaced apart, and the box body positioning ribs arranged on the first box body side wall and the box positioning ribs arranged on the second box body side wall are arranged one by one along the relative direction of the box body side wall and the second box body side wall.

[0033] Optionally, the base plate is also provided with a plurality of fixing holes, which are used to fix the battery pack to the base plate. The area of ​​the base plate where the plurality of fixing holes are provided is also provided with a third reinforcing rib, which is used to increase the thickness of the area. A weight-reducing groove is provided at the position where the fixing holes are not provided on the third reinforcing rib.

[0034] Optionally, a bottom surface of the bottom plate facing away from the receiving cavity is provided with a fourth reinforcing rib protruding from the bottom surface, and a plurality of the fourth reinforcing ribs are provided, distributed in an array and connected in sequence.

[0035] Optionally, the outer surface of the box body wall is provided with a transporting part and a fifth reinforcing rib for transporting the box body, the transporting part is connected to the fifth reinforcing rib, a plurality of the fifth reinforcing ribs are provided and are distributed in a straight line below the transporting part, and the connection area between the two fifth reinforcing ribs at the two ends of the plurality of fifth reinforcing ribs and the box body wall and the transporting part is larger than the connection area between the fifth reinforcing ribs in the middle and the box body wall and the transporting part.

[0036] Optionally, a sixth reinforcing rib is further provided on the outer surface of the box wall, and the sixth reinforcing rib extends along the connecting portion between the bottom plate and the box wall and is located at the bottom of the box wall.

[0037] A vehicle comprising:

[0038] vehicle body;

[0039] A battery box assembly is installed on the vehicle body, wherein the battery box assembly includes a battery pack and any one of the above-mentioned battery boxes, and the battery pack is accommodated in the battery box.

[0040] A method for preparing a battery box, the battery box comprising the box body and upper cover described in any one of the above items, at least one of the box body and upper cover being prepared using the following injection molding process:

[0041] The extrusion temperature is 260℃~270℃;

[0042] The injection molding temperature is 250-260°C;

[0043] The mold temperature is 100°C;

[0044] The injection speed is 70 mm / s;

[0045] The injection pressure is 70MPa;

[0046] The screw speed was set at 120 r / min and the feeding speed was 30 r / min.

[0047] The present application provides a battery box, a vehicle and a method for preparing the battery box. According to the strength analysis results, random vibration analysis structure, lightweight and flame retardancy analysis, the battery box has good flame retardancy and can also meet the requirements of lightweight, high strength and random vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic diagram of a battery box shown in an exemplary embodiment of the present application;

[0049] Figure 2 yes Figure 1 An axonometric view of the upper cover shown in FIG;

[0050] Figure 3 yes Figure 1 A front view of the upper cover shown in FIG;

[0051] Figure 4 yes Figure 1 Axonometric view of the box shown in ;

[0052] Figure 5 It is the main view of the box;

[0053] Figure 6 It is a side view of the box;

[0054] Figure 7 It is a top view of the box;

[0055] Figure 8 This is a bottom view of the box. DETAILED DESCRIPTION

[0056] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0057] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0058] Please refer to Figure 1 , Figure 1 FIG. 1 is an exploded view of a battery box 100 according to an exemplary embodiment of the present application.

[0059] The present application provides a battery box 100, comprising a box body 10 and an upper cover 20, wherein the box body 10 and the upper cover 20 are detachably connected, and the connection method includes but is not limited to screw connection. The upper cover 20 is placed on the top of the box body 10, and the box body 10 and the upper cover 20 together form a receiving cavity for receiving a battery pack (not shown). Figure 1 In the illustrated embodiment, the box body 10 and the upper cover 20 are both configured as square shell structures, and cavities are formed inside the box body 10 and the upper cover 20 to increase the volume of the accommodating cavity.

[0060] Please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 20 is an axonometric view of the upper cover 20 shown in FIG. Figure 3 It is a front view of the upper cover 20.

[0061] In one embodiment, the upper cover 20 includes a cover plate 21 and an annular upper cover wall 22 connected to the edges of the cover plate 21. The cover plate 21 and the upper cover wall 22 together form a cavity, which serves as a portion of the receiving cavity. The inner surface of the cover plate 21 facing the receiving cavity is provided with cross-arranged first reinforcing ribs 210. The first reinforcing ribs 210 can cross each other vertically, but are not limited to this.

[0062] The inner surface of the upper cover wall 22 facing the receiving cavity is provided with an upper cover positioning rib 220 for cooperating with the box body 10 for positioning, and the upper cover positioning rib 220 is also connected to the first reinforcing rib 210. The first reinforcing rib 210 is used to strengthen the strength and rigidity of the cover plate 21, improve the ability of the cover plate 21 to resist damage and deformation, and provide protection for the battery pack in the receiving cavity. The upper cover positioning rib 220 is used to cooperate with the box body 10 for positioning, and improve the accuracy of the relative position of the box body 10 and the upper cover 20 when assembled. In addition, the upper cover positioning rib 220 is connected to the first reinforcing rib 210, which can increase the strength and rigidity of the upper cover positioning rib 220, reduce the risk of deformation or breakage of the upper cover positioning rib 220, and make positioning more reliable.

[0063] exist Figure 3 In the illustrated embodiment, the first reinforcing ribs 210 include transverse ribs 210a and longitudinal ribs 210b that intersect each other. Each transverse rib 210a extends from one transverse end to the other, and each longitudinal rib 210b extends from one longitudinal end to the other. In the embodiment in which the cover plate 21 is configured as a rectangular cover plate, the long side is defined as the transverse direction, and the short side is defined as the longitudinal direction.

[0064] In one embodiment, the upper cover surrounding wall 22 includes a first upper cover side wall 221 and a second upper cover side wall 222 opposite to each other. The upper cover positioning ribs 220 include a first positioning rib 2201 and a second positioning rib 2202 connected to the first upper cover side wall 221 and protruding toward the second upper cover side wall 222, and a third positioning rib 2203 and a fourth positioning rib 2204 connected to the second upper cover side wall 222 and protruding toward the first upper cover side wall 221. The first positioning rib 2201 and the second positioning rib 2202 are spaced apart and parallel to each other, and the third positioning rib 2203 and the fourth positioning rib 2204 are spaced apart and parallel to each other. The first positioning rib 2201, the second positioning rib 2202, the third positioning rib 2203, and the fourth positioning rib 2204 are collectively positioned with the box body 10. In this way, the upper cover positioning ribs 220 can be positioned with the box body 10 at four locations, ensuring the reliability of positioning.

[0065] exist Figure 3 In the embodiment shown, the first positioning rib 2201 and the third positioning rib 2203 are opposite to each other along the direction in which the first upper cover side wall 221 and the second upper cover side wall 222 are opposite to each other, and the second positioning rib 2202 and the fourth positioning rib 2204 are opposite to each other along the direction in which the first upper cover side wall 221 and the second upper cover side wall 222 are opposite to each other.

[0066] exist Figure 3 In the illustrated embodiment, the first positioning rib 2201 and the second positioning rib 2202 are further connected by a first connecting rib 2205, which is further connected to the cover plate 21. Thus, the first positioning rib 2201, the second positioning rib 2202, and the first connecting rib 2205 together form a first box structure with an opening toward the box body 10, which serves to increase the strength and rigidity of the first and second positioning ribs 2201, 2202, and improve positioning reliability. The third positioning rib 2203 and the fourth positioning rib 2204 are further connected by a second connecting rib 2206, which is further connected to the cover plate 21. Thus, the third positioning rib 2203, the fourth positioning rib 2204, and the second connecting rib 2206 together form a second box structure with an opening toward the box body 10, which serves to increase the strength and rigidity of the third and fourth positioning ribs 2203, 2204, and improve positioning reliability.

[0067] The first box body structure and the second box body structure may be symmetrically arranged, and the symmetrical center line is the midline of the distance between the first upper cover side wall 221 and the second upper cover side wall 222 , but is not limited thereto.

[0068] In one embodiment, a third connecting rib 2207 is further provided in the first box structure, and the third connecting rib 2207 connects the first upper cover side wall 221 and the first connecting rib 2205, thereby increasing the strength and rigidity of the first connecting rib 2205. The number of the third connecting rib 2207 is not limited.

[0069] exist Figure 3 In the illustrated embodiment, a plurality of third connecting ribs 2207 are provided, and the plurality of third connecting ribs 2207 are divided into a plurality of groups. For example, three third connecting ribs 2207 can be provided as a group, and each group is spaced apart. The third connecting ribs 2207 within each group are also spaced apart, but the present invention is not limited thereto. The second box structure can also adopt the same arrangement as described above, and will not be further described here.

[0070] In one embodiment, the upper cover wall 22 also includes a third upper cover side wall 223 and a fourth upper cover side wall 224 relative to each other, the third upper cover side wall 223 connects the first upper cover side wall 221 and the second upper cover side wall 222, and the fourth upper cover side wall 224 connects the first upper cover side wall 221 and the second upper cover side wall 221, wherein the upper cover 20 is a square upper cover, the first upper cover side wall 221 and the second upper cover side wall 222 are long sides, and the third upper cover side wall 223 and the fourth upper cover side wall 224 are short sides.

[0071] In one embodiment, Figure 2 As shown, the cover plate 21 is further provided with a positive electrode hole 211 and a negative electrode hole 212 for the positive and negative electrode posts to pass through the battery box 100. The positive electrode hole 211 and the negative electrode hole 212 are located near the third upper cover side wall 223 of the cover plate 21. The positive electrode post is used to connect to the positive electrode of the battery pack, and the negative electrode post is used to connect to the negative electrode of the battery pack to achieve power output. It should be noted that the locations of the positive electrode hole 211 and the negative electrode hole 212 are not limited to this. The positive electrode hole 211 and the negative electrode hole 212 can be countersunk, but are not limited to this.

[0072] In one embodiment, Figure 2 As shown, the cover plate 21 is further provided with a connection hole 213 for fixed connection with the battery pack. In this embodiment, a nut is embedded in the connection hole 213, and two connection holes 213 are provided, one adjacent to the third upper cover side wall 223 and the other adjacent to the fourth upper cover side wall 224, but the present invention is not limited thereto.

[0073] In one embodiment, Figure 2 As shown, the upper cover wall 22 is further provided with a plurality of spaced-apart connecting portions 225 around its perimeter. These connecting portions 225 are configured for removable connection to the housing 10. These connecting portions 225 include, but are not limited to, snap-fitting portions and bolted connections. In this embodiment, the latter is employed. Each connecting portion 225 is provided with a bolt hole, through which a bolt passes and is screwed into the housing 10.

[0074] exist Figure 2 In the illustrated embodiment, the upper cover wall 22 is further provided with a plurality of second reinforcing ribs 226 , and at least one of the connecting portions 225 is also connected to a second reinforcing rib 226 . This increases the strength of the connecting portion 225 and improves connection reliability. The structure of the second reinforcing ribs 226 is not limited. In this embodiment, the second reinforcing ribs 226 are arranged in a trapezoidal structure and are provided in plurality. Each connecting portion 225 is connected to two second reinforcing ribs 226 , which are located on opposite sides of the connecting portion 225 .

[0075] In order to avoid the bolts from interfering with the upper cover wall 22 when passing through the bolt holes of the connecting part 225, an avoidance groove 227 is further provided on the outer surface of the upper cover wall 22. The avoidance groove 227 is provided corresponding to the connecting part 225, is provided on the periphery of the bolt hole, and is located between the two second reinforcing ribs 226. The direction of the avoidance groove 227 is consistent with the radial direction of the bolt hole, providing a space for the bolts.

[0076] In an exemplary embodiment, the upper cover 20 is configured as an open rectangular box structure with a wall thickness of 6-8 mm, a length of 510-550 mm, and a width of 230-250 mm. To ensure strength and rigidity, first reinforcing ribs 210 are provided on the inner surface of the cover plate 21, forming a 20*20 square grid with 8 rows and 13 columns, and a 20*40 rectangular grid with 8 rows and 2 columns. To ensure battery pack stability, first and second connecting ribs 2205 and 2206, each 450 mm long and 1.2-1.5 mm high, are provided on either side of the width of the cover plate 21. The first connecting rib 2205 connects with the first and second positioning ribs 2201 and 2202 to form a rectangular first box structure. The second connecting rib 2206 connects with the third and fourth positioning ribs 2203 and 2204 to form a rectangular second box structure. The first and second box structures are symmetrical. At the same time, considering the internal strength and stiffness requirements of the first box structure and the second box structure, three third connecting ribs 2207 with the same spacing, a thickness of 0.5-0.8 mm, and a height of 1.2-1.5 mm are set between two adjacent connecting parts 225 in the first box structure, and the same setting is adopted in the second box structure.

[0077] Based on the positive and negative pole conductivity requirements of the battery box, the cover plate 21 is provided with two countersunk holes with a diameter of 18-20mm and a depth of 0.5-0.8mm, one for the positive pole hole 211 and the other for the negative pole hole 212. At the same time, in order to ensure that the battery pack and the upper cover 20 can be firmly fixed, a connection hole 213 with a hole diameter of 6.5mm-8mm and a pre-embedded nut is provided at each end of the length direction of the cover plate 21. Since the upper cover 20 and the box body 10 are connected by bolts, it is necessary to design multiple connection parts 225 around the upper cover 20. The connection part 225 is designed as a circular cylinder with an outer diameter of 10-12mm, a hole diameter of 6-8mm, and a thickness of 5-8mm. The arrangement is as follows: there are three evenly distributed connection parts 225 in the width direction of the upper cover 20, and five evenly distributed connection parts 225 in the length direction. In order to ensure the convenience of installing bolts in the connecting part 225, an avoidance groove 227 with a diameter of 10-12mm is also designed on it. To ensure the assembly accuracy and installation strength, a second reinforcing rib 226 with a trapezoidal structure with a thickness of 3-4mm, a short bottom side of 3mm, a long bottom side of 20mm, and a height of 6mm is provided on both sides of the avoidance groove 227.

[0078] Please refer to Figures 4 to 8 , Figure 4 for Figure 1 An axonometric view of the housing 10 is shown in FIG. Figure 5 for Figure 4 10 is a front view of the housing 10 shown in FIG. Figure 6 for Figure 4 FIG. 1 is a left side view of the housing 10 shown in FIG. Figure 7 for Figure 4 FIG. 1 is a top view of the housing 10 shown in FIG. Figure 8 for Figure 4 FIG. 1 is a bottom view of the housing 10 shown in FIG.

[0079] In one embodiment, the box body 10 includes a bottom plate 11 and an annular box body wall 12 connected to the edges of the bottom plate 11. The bottom plate 11 and the box body wall 12 together form a cavity, which serves as a portion of the receiving chamber. The shape of the box body 10 is not limited. In this embodiment, the box body 10 is configured as a rectangular box body, and the shape of the box body 10 is adapted to the upper cover 20.

[0080] In one embodiment, Figure 4 and Figure 7 As shown, the housing 10 is provided with housing positioning ribs 120 for defining spaces for placing battery cells. The housing positioning ribs 120 ensure the stability of the battery cells within the housing 10. Multiple housing positioning ribs 120 may be provided, and multiple housing positioning ribs 120 are arranged in parallel and at intervals to separate multiple placement spaces, corresponding one to each of the battery cells. Multiple battery cells are connected in parallel or in series to form a battery pack.

[0081] In one embodiment, the box-body positioning ribs 120 protrude from the inner surface of the box-body surrounding wall 12 and extend along the height direction of the box 10. The bottom end of the box 10 is connected to the bottom plate 11. Along the height direction of the box 10, the box-body positioning ribs 120 are configured as a variable cross-section structure, with the cross-sectional area at the bottom of the box-body positioning ribs 120 being larger than the cross-sectional area at the top of the box-body positioning ribs 120. This configuration can increase the strength and rigidity of the bottom of the box-body positioning ribs 120, improving its ability to resist deformation and damage.

[0082] exist Figure 4 In the illustrated embodiment, the protrusion at the bottom of the box-positioning rib 120 is greater than the protrusion at the top of the box-positioning rib 120, thereby achieving a variable cross-section structure for the box-positioning rib 120. In an alternative embodiment, the bottom of the box-positioning rib 120 is a right-angled trapezoidal structure, with two right-angled sides connected to the box-positioning wall 12 and the bottom plate 11, respectively, and the top is a rectangle. The bottoms and tops of multiple box-positioning ribs 120 can adopt the same structure.

[0083] It should be noted that the plurality of box body positioning ribs 120 are arranged in parallel, and the two outermost box body positioning ribs 120a and 120b cooperate with the first positioning rib 2201 and the second positioning rib 2202 of the upper cover 20 for positioning respectively.

[0084] In one embodiment, Figure 7 As shown, the box enclosure wall 12 includes a first box side wall 121 and a second box side wall 122 that are opposite to each other. A plurality of box positioning ribs 120 are provided, and are separately arranged on the first box side wall 121 and the second box side wall 122. The box positioning ribs 120 arranged on the first box side wall 121 are parallel and spaced apart, and the box positioning ribs 120 arranged on the second box side wall 122 are parallel and spaced apart. The box positioning ribs 120 arranged on the first box side wall 121 and the box positioning ribs 120 arranged on the second box side wall 122 are aligned one by one along the direction opposite to the first box side wall 121 and the second box side wall 122. In this way, the two opposing box positioning ribs 120 abut against the same battery cell on the same side, so that the same battery cell can be limited at multiple points, making the installation position of the battery cell more precise.

[0085] exist Figure 7 In the illustrated embodiment, the enclosure wall 12 includes a third sidewall 123 and a fourth sidewall 124 that are opposite each other. The third sidewall 123 connects the first sidewall 121 and the second sidewall 122, and the fourth sidewall 124 connects the first sidewall 121 and the second sidewall 122. The enclosure 10 is a rectangular enclosure, wherein the first sidewall 121 and the second sidewall 122 are the long sides, and the third sidewall 123 and the fourth sidewall 124 are the short sides.

[0086] In one embodiment, the bottom plate 11 is further provided with a plurality of fixing holes 110 for securing the battery pack to the bottom plate 11. In this embodiment, a portion of the fixing holes 110 is located near the third side wall 123, while the remaining fixing holes 110 are located near the fourth side wall 124. The two portions of fixing holes 110 are symmetrically arranged. The fixing holes 110 are used to screw into and secure the bottom plate 11 and the battery pack.

[0087] In one embodiment, to increase the strength of fixing hole 110, a third reinforcing rib 111 is provided in the area of ​​base plate 11 where fixing hole 110 is located. This thickens the area, thereby increasing the strength of fixing hole 110 and ensuring connection reliability. Furthermore, a weight-reducing groove 112 is provided in the area of ​​third reinforcing rib 111 where fixing hole 110 is not located. Multiple weight-reducing grooves 112 can be provided, and they can be of different sizes depending on the space available, facilitating lightweighting.

[0088] In one embodiment, Figure 7 As shown, the bottom plate 11 is further provided with support ribs 113, which connect the box wall 12 and the third reinforcement ribs 111. The number of support ribs 113 is not limited. Figure 7 In the embodiment shown, a plurality of support ribs 113 are provided, a portion of the support ribs 113 connects the fourth box side wall 124 and the third reinforcing rib 111, and a portion of the support ribs 113 connects the third box side wall 123 and the third reinforcing rib 111, and the plurality of support ribs 113 are arranged in parallel and at intervals.

[0089] In one embodiment, Figure 8 As shown, the bottom surface of the bottom plate 11 facing away from the receiving cavity is provided with a fourth reinforcing rib 114 protruding from the bottom surface. There are a plurality of the fourth reinforcing ribs 114, which are distributed in an array and connected in sequence. This allows the bottom surface of the bottom plate 11 to form a pattern, which can increase the friction of the bottom surface. Figure 8 In the illustrated embodiment, a plurality of fourth reinforcing ribs 114 distributed in an array form honeycomb-shaped grooves and diamond-shaped grooves on the bottom surface, but the present invention is not limited thereto.

[0090] In one embodiment, Figures 5 to 8 As shown, the outer surface of the box body wall 12 is provided with a transport portion 125 and a fifth reinforcing rib 126, and the transport portion 125 is connected to the fifth reinforcing rib 126. The transport portion 125 facilitates the movement of the battery box, and the fifth reinforcing rib 126 can strengthen the connection strength of the transport portion 125. Figure 8 In the illustrated embodiment, the third box side wall 123 and the fourth box side wall 124 are respectively provided with a transport portion 125 , and the transport portion 125 is configured as a plate body with a trapezoidal structure to facilitate film removal after injection molding.

[0091] In one embodiment, multiple fifth reinforcing ribs 126 are provided and spaced apart in a straight line below the transport portion 125. The connection areas between the two fifth reinforcing ribs 126 at the ends and the box wall 12 and the transport portion 125 are larger than the connection areas between the fifth reinforcing ribs 126 in the middle. This increases the strength of the transport portion 125 at both ends and reduces the risk of fracture of the transport portion 125 due to stress concentration.

[0092] The fifth reinforcing ribs 126 can be configured as triangular ribs, but are not limited thereto. In this embodiment, two sets of fifth reinforcing ribs 126 are provided, one set below each transport portion 125, to strengthen the connection strength of the transport portion 125 corresponding to the corresponding fifth reinforcing rib 126. Alternatively, multiple reinforcing ribs can be provided above the transport portion 125, corresponding to the multiple fifth reinforcing ribs 126 in the vertical direction.

[0093] In one embodiment, Figure 5 and Figure 6 As shown, the outer surface of the box wall 12 is further provided with a sixth reinforcing rib 127. The sixth reinforcing rib 127 extends around the junction of the bottom plate 11 and the box wall 12 and is located at the lowest point of the box wall 12. The sixth reinforcing rib 127 can be configured as a rectangular rib, but is not limited to this. The sixth reinforcing rib 127 increases the thickness of the box wall 12 at the lowest point, thereby strengthening the connection between the bottom plate 11 and the box wall 12 at this point.

[0094] In one embodiment, Figure 8 As shown, the box wall 12 is provided with a plurality of mating portions 128, which are used to mate with the connecting portion 225 of the upper cover 20. The mating portions 128 include mating holes, which correspond to and are coaxial with the connecting holes on the connecting portion 225 and are detachably connected by screws.

[0095] In an exemplary embodiment, the box body 10 is a rectangular box body, and the inner surfaces of the two opposite long sides of the box body wall 12 are provided with 16 box body positioning ribs 120 evenly distributed, wherein the thickness of the box body positioning rib 120 is designed to be 3-4 mm, but the height direction design is slightly different. The bottom of the box body positioning rib 120 is designed to be a trapezoidal structure with a long side of 10-15 mm, a short side of 5-7 mm, and a height of 15-17 mm, while the top is designed to be a rectangular structure with a length of 60-70 mm and a height of 8-10 mm.

[0096] To better secure the battery pack, four fixing holes 110 with a diameter of 10-15mm and a depth of 6-8mm are designed on each side of the base plate 11 along its length. To ensure the strength and rigidity requirements of fixing holes 110, third reinforcing ribs 111 are used to reinforce fixing holes 110. These ribs are located in the area of ​​the base plate 11 where fixing holes 110 are located. They are 6-8mm thick, 200-230mm long, and 15-20mm wide. These ribs can be rectangular.

[0097] For lightweighting purposes, weight-reducing grooves 112 are provided in the areas of the third reinforcing rib 111 where no fixing holes 110 are provided. The weight-reducing groove 112 in the middle is a rectangular groove with a length of 40-50mm and a width of 8-10mm. The other four grooves around the hole are rectangular grooves with a length of 15-20mm and a width of 8-10mm. At the same time, to ensure the lateral stiffness requirements of the third reinforcing rib 111, nine support ribs 113 with a thickness of 4-5mm, a height of 8-9mm, and a width of 12-15mm are designed on the left side near the third box side wall 123. Eight support ribs 113 with a thickness of 4-5mm, a height of 8-9mm, and a width of 15-20mm are designed on the right side near the fourth box side wall 124.

[0098] In order to ensure the fixing strength of the box body 10 and increase the friction between it and other parts, a plurality of fourth reinforcing ribs 114 are designed on the bottom surface of the outer side of the box body 10. The plurality of fourth reinforcing ribs 114 are in an array structure, forming honeycomb-like grooves and diamond-shaped grooves. Among them, the honeycomb-shaped regular hexagonal grooves are designed to be 5-6mm thick, 15-20mm diagonal, and 9-12mm high. They are designed to have 14 regular hexagons in a row, and a total of five rows. A matching portion 128 is also designed on the outer periphery of the box body 10. The matching portion 128 is provided with a matching hole with an outer diameter of 10-12mm and a thickness of 5-8mm. The box body 10 is matched with the upper cover 20 for installation. Therefore, a nut with an inlay grade of 6.8 and a hole diameter of 5-7mm is provided in the matching hole, and the inlaid nut of the box body 10 is matched one by one with the bolt hole of the upper cover 20. The two short sides of the box body 10 are respectively provided with three evenly distributed matching holes, and the two long sides are respectively provided with five evenly distributed matching holes.

[0099] To facilitate the movement of the battery box 100, the short sides have been structurally optimized. The movable portions 125 on either side are designed as trapezoidal structures with a thickness of 8-10mm, a long side of 220-230mm, a short side of 180-200mm, and a height of 20-30mm. Six rectangular ribs, each 3-4mm thick, 4-5mm high, and 20-30mm long, are incorporated into this trapezoidal structure. Six triangular fifth reinforcing ribs 126 are designed below the movable portion 125, corresponding one-to-one with the six rectangular ribs above the movable portion 125. The two outermost fifth reinforcing ribs 126 are larger, measuring 20-30mm high and 50-70mm long. The four middle fifth reinforcing ribs 126 are slightly smaller, measuring 20-30mm high and 40-50mm long. In addition, due to strength requirements and to ensure the stability of the battery pack, a circle of sixth reinforcing ribs 127 with a height of 10-15 mm and a thickness of 6-8 mm is designed at the bottom of the box body 10.

[0100] The present application also provides a battery box 100, comprising the box body 10 and the upper cover 20 described above, at least one of the box body 10 and the upper cover 20 being made of a modified glass fiber composite material, wherein the modified glass fiber composite material comprises: 40-60 parts by mass of polyphenylene ether; 20-25 parts by mass of styrene; 5-8 parts by mass of a compatibilizer; 3-5 parts by mass of a plasticizer; 4-5 parts by mass of a flame retardant; 5-7 parts by mass of a solvent resistant agent; 18-20 parts by mass of glass fiber; 0.2 parts by mass of an antioxidant; 0.2 parts by mass of a lubricant; 0.2 parts by mass of a scratch resistant agent; and 0.1 parts by mass of a light stabilizer.

[0101] In one embodiment, the compatibilizer is selected from one or more combinations of styrene-maleic anhydride copolymer, maleic anhydride grafted polypropylene, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, and the like.

[0102] In one embodiment, the plasticizer is selected from triphenyl phosphate, dihydroxydiphenyl sulfide, or a combination of the two.

[0103] In one embodiment, the flame retardant is a styrene-propylene copolymer of phosphate ester.

[0104] In one embodiment, the solvent-resistant material is selected from polypropylene, styrene-acrylonitrile copolymer, or acrylonitrile, butadiene and styrene copolymer, or a combination thereof.

[0105] In one embodiment, the glass fiber is 2400tex glass fiber.

[0106] In one embodiment, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0107] In one embodiment, the light stabilizer is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0108] The present application also provides a method for preparing a battery box 100, which includes the box body 10 and the upper cover 20 described above, and at least one of the box body 10 and the upper cover 20 is prepared using the following injection molding process. Among them, the extrusion temperature is 260℃~270℃, the injection temperature is 250~260℃; the mold temperature is 100℃; the injection speed is 70mm / s; the injection pressure is 70MPa; the screw speed is set to 120r / min, and the feeding speed is 30r / min. Among them, the extrusion temperature is the temperature at which the material is heated to the extrusion temperature in the screw. The screw is connected to the pouring head, and the plasticized material is injected into the injection mold through the pouring head. The injection temperature refers to the temperature when it reaches the pouring head, and the mold temperature is the temperature of the injection mold. The injection speed is the flow rate of the material from the screw to the mold, the injection pressure is the pressure when the material is transported from the screw to the mold, and the feeding speed is the speed at which the material enters the screw from the mixer.

[0109] The present application also provides a vehicle (not shown), which includes a vehicle body and a battery box assembly mounted on the vehicle body. The battery box assembly includes a battery box 100 and a battery pack, wherein the battery pack is accommodated in the battery box 100.

[0110] The performance analysis of the battery box assembly provided in this application is shown in Tables 1 to 3.

[0111] Table 1 Battery box assembly strength analysis

[0112]

[0113] Table 1 shows the strength analysis of the battery box assembly. The battery box assembly is fixed to the vibration platform with M8 bolts. A 4kg mass point is added to the two pressure plates, and the tightening torque of a single bolt is 10Nm. The maximum stress values ​​of the upper cover 20 and the box body 10 are obtained. The analysis shows that the strength values ​​of the battery assembly after applying the bolt preload are 66.8MPa and 69.2MPa, respectively, both meeting the design requirement of 0.8 times the material tensile strength, ≤72MPa.

[0114] Table 2 Random vibration analysis of battery box assembly

[0115]

[0116] After the upper cover 20 and the box body 10 are fixed together by bolts, excitation is applied based on the standard of GB / T38031 to test the frequency response analysis results.

[0117] Random vibration in the X direction: The maximum stress of the upper cover 20 is 2.4 MPa, and the maximum stress of the box body 10 is 4.0 MPa, which are far less than the design requirement of the material yield strength of 72 MPa.

[0118] Random vibration in the Y direction: The maximum stress of the upper cover 20 is 1.6 MPa, and the maximum stress of the box 10 is 2.0 MPa, which is far less than the material yield strength required by the design.

[0119] Random vibration in the Z direction: the maximum stress of the upper cover 20 is 3.1 MPa, and the maximum stress of the box body 10 is 6.7 MPa, which are far less than the material yield strength required by the design.

[0120] Table 3 Comparative analysis of lightweight, flame retardancy and water absorption of modified glass fiber composite materials and traditional materials

[0121]

[0122] According to Table 3, the modified glass fiber composite material can achieve a weight reduction of 6.8% compared with the traditional PA reinforced glass fiber composite material, while the vertical flame retardancy reaches V0 level and the water absorption rate reaches 0.12%.

[0123] In summary, according to Tables 1 to 3, the modified glass fiber composite material is used to replace the original PA reinforced glass fiber composite material, and through structural optimization and optimization of process parameters in the preparation method, the design and product manufacturing are met, and the goals of lightweighting and improving mechanical properties are achieved. At the same time, high flame retardancy of the product and improvement of the water absorption performance of the product are also achieved, providing technical support for lightweighting and high-quality products of commercial vehicles, and can be widely used in the current commercial vehicle market.

[0124] The manufacturing process parameters of the battery box 100 are shown in Table 4.

[0125] Table 4

[0126] Process parameters Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 mold temperature 90℃ 100℃ 100℃ 100℃ 100℃ 100℃ Injection temperature 210℃ 240℃ 250℃ 250℃ 250℃ 260℃ Extrusion temperature 235℃ 250℃ 250℃ 260℃ 260℃ 270℃ Screw speed 300r / min 110r / min 110r / min 110r / min 120r / min 110r / min Feeding speed 150r / min 25r / min 30r / min 25r / min 30r / min 30r / min

[0127] The performance comparison of the modified glass fiber composite material and the traditional PA reinforced glass fiber composite material is shown in Table 5.

[0128] Table 5

[0129]

[0130] Table 5 shows the performance test results of the product made from the original glass fiber composite material in Comparative Example 1.

[0131] The performance test results of the products made of modified glass fiber composite materials in Example 2 show that the density is relatively large, the mechanical properties are relatively high, and the obtained products have traces.

[0132] The performance test results of the product prepared by using the modified glass fiber composite material in Example 3 show that the injection molding temperature and feeding speed are increased compared with Example 2. The increase in injection molding temperature helps to improve the surface roughness of the product and reduce the mark. The increase in injection molding temperature can effectively reduce the internal stress of the product and the orientation degree of the product, improve the full solidification of the melt, and help improve the apparent quality of the product. When the feeding speed is increased, the glass fiber content is reduced and the physical properties of the material are reduced. This is because the screw speed is fixed, and the rate of glass fiber addition and delivery is basically unchanged. As the feeding speed increases, the delivery speed of the polymer will increase, so the proportion of polymer in the pellets will increase accordingly, that is, the glass fiber content of the material is reduced.

[0133] In Example 4, the performance test results of products made from modified glass fiber composite materials show that, compared to Example 3, the extrusion temperature was increased and the feed rate was reduced. The increased extrusion temperature significantly reduced the residual marks on the resulting products, and the surface quality also improved accordingly. This is primarily due to the fact that increasing the extrusion temperature improves melt fluidity and reduces product shrinkage. However, when the extrusion temperature is too high, when the melt temperature approaches the upper limit of the injection molding temperature, it is very likely to generate a large amount of gas, causing defects such as bubbles, voids, and discoloration in the plastic. However, when the feed rate is reduced, the glass fiber content is increased, and the physical properties of the material are significantly improved.

[0134] The performance test results of the product prepared by the modified glass fiber composite material in Example 5 show that the extrusion temperature is increased and the feeding speed is decreased compared with Example 4. When the extrusion temperature is increased, the fluidity of the melt is improved and the apparent quality of the product can be reduced. However, due to the reduction in the feeding speed, the glass fiber content increases, which also affects the appearance quality of the product.

[0135] Example 6 uses the performance test results of the products made of modified glass fiber composite materials. Combined with the key factors affecting the product, the relevant product process parameters are adjusted, and reasonable extrusion temperature, injection temperature, screw speed, mold temperature, etc. are selected to achieve product performance and appearance quality requirements.

[0136] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery box, characterized in that: The battery box includes a box body and an upper cover, wherein the box body and the upper cover together form a receiving cavity for receiving the battery, and at least one of the box body and the upper cover is made of a modified glass fiber composite material, wherein the modified glass fiber composite material includes: Polyphenylene ether: 40-60 parts by mass; Styrene: 20-25 parts by mass; Compatibilizer: 5-8 parts by mass; Plasticizer: 3-5 parts by mass; Flame retardant: 4-5 parts by mass; Solvent resistance: 5-7 parts by mass; Glass fiber: 18-20 parts by mass; Antioxidant: 0.2 parts by mass; Lubricant: 0.2 parts by mass; Scratch resistant agent: 0.2 parts by mass; Light stabilizer: 0.1 parts by mass 2. The battery box according to claim 1, characterized in that: The compatibilizer is selected from one or more combinations of styrene-maleic anhydride copolymer, maleic anhydride grafted polypropylene, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, etc.; and / or The plasticizer is selected from one or a combination of triphenyl phosphate and dihydroxydiphenyl sulfide; and / or The flame retardant is a styrene-propylene copolymer of a phosphate ester; and / or The solvent-resistant polymer is selected from one or more combinations of polypropylene, styrene-acrylonitrile copolymer or acrylonitrile, butadiene and styrene copolymer; and / or The glass fiber is 2400tex glass fiber; and / or The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; and / or The light stabilizer is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

3. The battery box according to claim 1, characterized in that: The upper cover includes a cover plate and an annular upper cover wall connected to the edges of the cover plate. The cover plate and the upper cover wall together enclose a portion of the receiving cavity. The inner surface of the cover plate facing the receiving cavity is provided with cross-arranged first reinforcing ribs, and the inner surface of the upper cover wall facing the receiving cavity is provided with upper cover positioning ribs for cooperating with the box body for positioning, and the upper cover positioning ribs are also connected to the first reinforcing ribs.

4. The battery box according to claim 3, characterized in that: The upper cover surrounding wall includes a first upper cover side wall and a second upper cover side wall relative to each other, the upper cover positioning ribs include a first positioning rib and a second positioning rib provided on the first upper cover side wall and protruding toward the second upper cover side wall, and a third positioning rib and a fourth positioning rib provided on the second upper cover side wall and protruding toward the first upper cover side wall, the first positioning rib and the second positioning rib are spaced apart and parallel, the third positioning rib and the fourth positioning rib are spaced apart and parallel, and the first positioning rib, the second positioning rib, the third positioning rib and the fourth positioning rib are all coordinated with the box body for positioning.

5. The battery box according to claim 4, characterized in that: The first positioning rib and the second positioning rib are connected by a first connecting rib, the first connecting rib is also connected to the cover plate, and the first positioning rib, the second positioning rib and the first connecting rib are combined to form a box structure; and / or The third positioning rib is connected to the fourth positioning rib via a second connecting rib, the second connecting rib is further connected to the cover plate, and the third positioning rib, the fourth positioning rib and the second connecting rib are combined to form a box structure; and / or The upper cover wall is provided with a plurality of spaced-apart connecting portions and a plurality of second reinforcing ribs. The connecting portions are used for detachable connection with the box body, and at least one of the connecting portions is also connected to the second reinforcing rib.

6. The battery box according to any one of claims 1 to 5, characterized in that: The box body includes a bottom plate and an annular box body wall connected to the edges of the bottom plate. The bottom plate and the box body wall together enclose a part of the receiving cavity. The box body is provided with box body positioning ribs for defining the placement space of the battery cell.

7. The battery box according to claim 6, characterized in that: The box positioning rib protrudes from the inner surface of the box wall and extends along the height direction of the box, the bottom end of the box positioning rib is connected to the bottom plate, and in the height direction of the box, the box positioning rib is configured as a variable cross-section structure, and the cross-sectional area of ​​the bottom of the box positioning rib is larger than the cross-sectional area of ​​the top of the box positioning rib; and / or The box body surrounding wall includes a first box body side wall and a second box body side wall that are opposite to each other. There are multiple box body positioning ribs, which are respectively arranged on the first box body side wall and the second box body side wall. The box body positioning ribs arranged on the first box body side wall are parallel and spaced apart, and the box body positioning ribs arranged on the second box body side wall are parallel and spaced apart. The box body positioning ribs arranged on the first box body side wall and the box positioning ribs arranged on the second box body side wall are arranged one by one in the relative direction of the box body side wall and the second box body side wall.

8. The battery box according to claim 6, characterized in that: The bottom plate is further provided with a plurality of fixing holes, the plurality of fixing holes being used to fix the battery pack to the bottom plate, the area of ​​the bottom plate provided with the plurality of fixing holes is further provided with a third reinforcing rib, the third reinforcing rib being used to increase the thickness of the area, and a weight-reducing groove being provided at a position of the third reinforcing rib where the fixing holes are not provided; and / or The bottom surface of the bottom plate facing away from the receiving cavity is provided with a fourth reinforcing rib protruding from the bottom surface. There are a plurality of the fourth reinforcing ribs distributed in an array and connected in sequence.

9. The battery box according to claim 6, characterized in that: The outer surface of the box body wall is provided with a transport portion and a fifth reinforcing rib for transporting the box body, the transport portion is connected to the fifth reinforcing rib, a plurality of the fifth reinforcing ribs are provided and are distributed below the transport portion along a straight line at intervals, and the connection area between the two fifth reinforcing ribs at the two ends of the plurality of the fifth reinforcing ribs and the box body wall and the transport portion is larger than the connection area between the fifth reinforcing ribs in the middle and the box body wall and the transport portion; and / or The outer surface of the box body wall is further provided with a sixth reinforcing rib, which extends along the connecting portion between the bottom plate and the box body wall and is located at the bottom of the box body wall.

10. A vehicle, characterized in that: include: vehicle body; A battery box assembly is installed on the vehicle body, the battery box assembly includes a battery pack and the battery box according to any one of claims 1 to 9, and the battery pack is accommodated in the battery box.

11. A method for preparing a battery box, characterized in that: The battery box comprises a box body and an upper cover according to any one of claims 1 to 9, and at least one of the box body and the upper cover is prepared by the following injection molding process: The extrusion temperature is 260℃~270℃; The injection molding temperature is 250-260°C; The mold temperature is 100°C; The injection speed is 70 mm / s; The injection pressure is 70MPa; The screw speed was set at 120 r / min and the feeding speed was 30 r / min.

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