CN116834336A - Preparation method of battery pack shell - Google Patents
Preparation method of battery pack shell Download PDFInfo
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- CN116834336A CN116834336A CN202310706022.9A CN202310706022A CN116834336A CN 116834336 A CN116834336 A CN 116834336A CN 202310706022 A CN202310706022 A CN 202310706022A CN 116834336 A CN116834336 A CN 116834336A
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 86
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 79
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 35
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- 230000008018 melting Effects 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims description 77
- 239000004744 fabric Substances 0.000 claims description 64
- 239000003365 glass fiber Substances 0.000 claims description 60
- 229920002635 polyurethane Polymers 0.000 claims description 43
- 239000004814 polyurethane Substances 0.000 claims description 43
- 238000005507 spraying Methods 0.000 claims description 22
- 230000000750 progressive effect Effects 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 229920001169 thermoplastic Polymers 0.000 claims description 16
- 239000004416 thermosoftening plastic Substances 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000741 silica gel Substances 0.000 claims description 15
- 229910002027 silica gel Inorganic materials 0.000 claims description 15
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- 239000000758 substrate Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
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- 239000002131 composite material Substances 0.000 abstract description 32
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
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- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/541—Positioning reinforcements in a mould, e.g. using clamping means for the reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3468—Batteries, accumulators or fuel cells
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
A preparation method of a battery pack shell, which belongs to the technical field of composite materials; the method comprises the following steps: cutting the fiber matrix, and connecting the reinforcing sheet to the fiber matrix to obtain a reinforcing matrix; tensioning and fixing the reinforced matrix by adopting a clamping piece mechanism; attaching a thermosetting resin to the reinforcing matrix; installing a clamping piece mechanism fixed with a reinforcing matrix on a die; carrying out compression molding on the reinforced matrix attached with the thermosetting resin to obtain a battery pack shell; the reinforcing sheet is connected to the fiber matrix through a fixing piece, and the melting point of the fixing piece is not higher than the heat preservation and pressure maintaining temperature of compression molding; the fixing piece with the melting point lower than the heat preservation and pressure maintaining temperature of compression molding is adopted to realize connection of the reinforcing piece and the fiber matrix, in the compression molding process, the fixing piece can be melted, the melted fixing piece cannot produce the action of pulling the reinforcing piece and the fiber matrix, the probability of the reinforcing piece or the fiber matrix being pulled is effectively reduced, and then the probability of fiber fracture is improved.
Description
Technical Field
The application relates to the technical field of composite materials, in particular to a preparation method of a battery pack shell.
Background
The power battery pack is used as core energy equipment with the maximum mass (more than or equal to 30 percent) and the highest cost (40-60 percent) in the whole vehicle of the new energy automobile, and the weight reduction is required to be continuously realized so as to improve the dynamic property and the cruising ability of the whole vehicle; however, the primary core problem faced by the power battery pack is still the thermal runaway protection and personal safety of the vehicle, and with the rapid development and increasing market share of new energy automobiles, safety accidents such as spontaneous combustion, collision and fire of the new energy automobile battery are frequent, so that people are raised to worry about the safety of the new energy automobile. Meanwhile, under the current situation that the technology of the power battery cell is slow in development, the weight reduction of the power battery pack shell is effectively realized, and the power battery pack shell is changed into a focus point for light weight of the new energy automobile.
The use of fibrous composites, particularly continuous fibrous composites, in power cell housings has received attention both at home and abroad. Compared with an aluminum structure, the fiber composite material has the advantages of weight reduction of more than 40%, strong designability, good dimensional stability, corrosion resistance, abrasion resistance, shock absorption and the like, and has remarkable advantages when being applied to a power battery shell. However, in the field of automobiles, the existing continuous fiber reinforced resin matrix composite material cannot break through the technical problem of forming a complex structure due to small damage strain of fibers, and obvious defects such as fiber breakage, wrinkling and the like are caused. It has been proposed to improve this defect by using a reinforcing sheet, but even after the improvement by using a reinforcing sheet, the probability of fiber breakage is high.
Disclosure of Invention
The application provides a preparation method of a battery pack case, which can further improve the occurrence probability of fiber breakage.
The embodiment of the application provides a preparation method of a battery pack shell, which comprises the following steps:
obtaining a fiber matrix;
cutting the preset position of the fiber matrix to form a cutting area on the fiber matrix, and connecting the reinforcing sheet to the fiber matrix to cover the cutting area to obtain a reinforcing matrix;
tensioning and fixing the reinforced matrix by adopting a clamping piece mechanism;
attaching a thermosetting resin to the reinforcing matrix;
installing a clamping piece mechanism fixed with a reinforcing matrix on a die to realize the transfer of the reinforcing matrix attached with thermosetting resin into the die;
carrying out compression molding on the reinforced matrix attached with the thermosetting resin to obtain a battery pack shell;
wherein, the reinforcement piece is connected with the fiber matrix through the mounting, and the melting point of the mounting is not higher than the heat preservation pressure maintaining temperature of compression molding.
In the implementation process, the connection of the reinforcing sheet and the fiber matrix is realized by adopting the fixing piece with the melting point lower than the heat preservation and pressure maintaining temperature of compression molding, the fixing piece can be melted in the compression molding process, the melted fixing piece can not produce the action of pulling and the like on the reinforcing sheet and the fiber matrix, the probability of the reinforcing sheet or the fiber matrix being pulled is effectively reduced, and the probability of fiber fracture is further improved.
As an alternative embodiment, the fastener comprises a thermoplastic fastener.
In the implementation process, the reinforcement sheet and the fiber matrix can be connected quickly and well through the thermoplastic fixing nails. Meanwhile, the material consumption of the whole thermoplastic fixing nail is less, and the performance influence of the whole thermoplastic fixing nail on the whole battery pack shell can be reduced.
As an alternative embodiment, the overlap area of the reinforcing sheet and the fibrous matrix is no less than 20mm wide.
In the implementation process, in the compression molding process, the mold can extrude the reinforcing matrix, the extrusion can enable the reinforcing sheet and the fiber matrix to relatively displace, in order to reduce the displacement to cause the whole battery shell body to generate a gap, a certain width is required to exist in the lap joint area of the reinforcing sheet and the fiber matrix, and the width is not less than 20mm, so that the generation of the gap can be reduced to a large extent.
As an alternative embodiment, the reinforcing sheet comprises a glass fiber fabric in which glass fibers are orthogonally distributed.
In the implementation process, the glass fibers of the reinforcing sheet are orthogonally distributed, so that a better reinforcing effect can be generated.
As an alternative embodiment, the fibrous matrix comprises a stack of chopped strand mat and continuous fiber cloth.
As an alternative embodiment, the preset position of the fiber matrix is determined according to simulation software; and/or
The simulation software includes Fibersim.
In the implementation process, the complex deformation area of the battery can body, which is easy to cause defects such as fiber breakage, wrinkling and the like, can be conveniently and rapidly predetermined through three-dimensional simulation software during design.
As an alternative embodiment, the clip mechanism includes a first clip and a second clip; the first clamping piece and/or the second clamping piece are/is provided with a limiting needle; the first clamping piece is provided with a blank pressing ball mechanism, the blank pressing ball mechanism comprises a blank pressing ball body and an installation seat, the installation seat is connected to the first clamping piece, and the blank pressing ball body is rotatably installed on the installation seat.
As an alternative embodiment, the thermosetting resin comprises polyurethane.
In the implementation process, the polyurethane has excellent flame retardant property, and when the polyurethane is applied to a battery pack shell, the thermal runaway protection capability of the battery pack can be improved.
As an alternative embodiment, a silica gel layer is laid in the mold; and/or
The thickness of the silica gel layer is 0.2-2 mm.
In the implementation process, the arrangement of the silica gel layer is beneficial to improving the forming capability of the reinforcing matrix in the die and improving the surface quality of the finally prepared battery pack shell.
As an alternative embodiment, the means for attaching the thermosetting resin to the reinforcing matrix comprises spraying; and/or
The compression molding is carried out in a vacuum-assisted progressive compression molding mode; and/or
The temperature of the heat preservation and pressure maintaining is 100-140 ℃; and/or
The time of heat preservation and pressure maintaining is 200-400 s.
In the implementation process, the thermosetting resin is attached to the reinforcing matrix in a spraying mode, and the follow-up compression molding is performed in a vacuum-assisted progressive compression molding mode, so that the infiltration of the thermosetting resin to the reinforcing matrix can be effectively improved, and the probability of defects of a battery pack shell is further reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method provided by an embodiment of the present application;
FIG. 2 is a schematic view of a clip mechanism according to an embodiment of the present application 1;
fig. 3 is a schematic structural view 2 of a clip mechanism according to an embodiment of the present application.
Icon: 1-a first blank pressing ball hole; 2-a second blank pressing ball hole; 3-edge pressing ball body; 4-limiting needles; 5-a first clip; 6-a second clamping piece.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; accordingly, the description of a range should be considered to have specifically disclosed all possible sub-ranges as well as single numerical values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever the range applies. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
At present, the application of the continuous fiber reinforced resin matrix composite material in the field of automobiles mainly has two core technical problems: on the one hand, the cost problem due to manufacturing efficiency is a primary factor limiting its application. The continuous fiber composite material is manufactured at low cost, and is manufactured integrally mainly by High Pressure Resin Transfer Molding (HPRTM), prepreg molding (PCM) and other processes. However, the HPRTM process has high cost, and the process period required by resin injection and infiltration curing is long, so that the requirements of short period and high efficiency production cannot be further met; the PCM technology adopts the prepreg to improve the performance stability of the component, but is limited by the high material cost of the prepreg, the high time and labor cost of the laying process, and the application range of the prepreg is limited. On the other hand, the forming technical problem of the complex structure can not be overcome because the damage strain of the fiber is small, and obvious defects such as fiber fracture, wrinkling and the like are caused. In addition, if focusing on the application of the power battery shell, the flame retardant capability of the traditional epoxy resin and polypropylene resin is challenged, and the thermal runaway protection capability of the power battery pack cannot be effectively ensured.
The inventor aims to provide a brand new preparation path of the battery pack shell, and the quick combination of fibers and resin and the integral formation of a member are realized by adopting a thermosetting resin spraying and vacuum-assisted progressive die-forming mode; the forming capability of the continuous fiber reinforced resin matrix composite is effectively improved by tightly matching the methods of fabric cutting-reinforcing design, vacuum assisted progressive die pressing, introduction of a silica gel soft die, multi-scale edge pressing control and the like, and the technical problem of forming the complex-shaped component of the power battery pack is solved.
On one hand, the application provides a new technical path for the power battery pack shell of the new energy automobile by adopting the continuous fiber reinforced resin matrix composite material, and effectively solves the technical problem of complex component forming with fire resistance and flame retardance; meanwhile, a new thought is provided for rapid and low-cost manufacture of the continuous fiber composite material, and the application of the continuous fiber composite material in civil fields such as automobiles, rail transit and the like is effectively promoted.
As shown in fig. 1, an embodiment of the present application provides a method for preparing a battery pack case, including:
s1, obtaining a fiber matrix;
in some embodiments, the fibrous matrix comprises a stack of chopped strand mat and continuous fiber cloth.
Specifically, in this embodiment, the hybrid fabric such as the chopped strand mat and the continuous fiber cloth is cut to the target size of the product, and is sequentially laid, and the laying order may be a square grid fabric, warp knitting fabric, twill fabric, axial fabric or other hybrid fabric structure with a central symmetrical laying in the middle, and the surface is a glass fiber hybrid fabric surface layer, for example, a chopped glass fiber surface mat.
S2, cutting the preset position of the fiber matrix to form a cutting area on the fiber matrix, and connecting the reinforcing sheet to the fiber matrix to cover the cutting area to obtain a reinforcing matrix; wherein, the reinforcement piece is connected with the fiber matrix through the mounting, and the melting point of the mounting is not higher than the heat preservation pressure maintaining temperature of compression molding.
In some embodiments, the fasteners comprise thermoplastic staples. The thermoplastic fixing nail mainly comprises a conical nail body, the nail body is penetrated through the reinforcing sheet and the fiber matrix simultaneously to realize the connection of the reinforcing sheet and the fiber matrix, and a limiting block can be arranged at the tail end of the nail body generally so as to prevent the thermoplastic fixing nail from easily penetrating and separating from the reinforcing sheet and the fiber matrix to cause the failure of the connection of the reinforcing sheet and the fiber matrix. The reinforcement sheet and the fiber matrix can be connected quickly and well through the thermoplastic fixing nails. Meanwhile, the material consumption of the whole thermoplastic fixing nail is less, and the performance influence of the whole thermoplastic fixing nail on the whole battery pack shell can be reduced.
In some embodiments, the overlap area width of the reinforcing sheet and fibrous matrix is not less than 20mm. In the compression molding process, the mold can extrude the reinforcing matrix, the extrusion can enable the reinforcing sheet and the fiber matrix to generate relative displacement, in order to reduce the displacement to cause the blank of the whole battery shell body, a certain width is required to exist in the lap joint area of the reinforcing sheet and the fiber matrix, and the width is not less than 20mm, so that the blank can be reduced to a large extent.
In some embodiments, the reinforcing sheet comprises a fiberglass fabric in which the fiberglass fibers are orthogonally distributed. It should be noted that, the orthogonal distribution herein is not 90 ° perpendicular in an absolute sense, but means that glass fibers are interlaced, for example, including a first fiber group and a second fiber group of a glass fiber fabric, each fiber in the first fiber group and each fiber in the second fiber group are disposed parallel to each other, and an included angle exists between the fibers in the first fiber group and the fibers in the second fiber group. The glass fibers of the reinforcing sheet are orthogonally distributed to produce a better reinforcing effect.
In some embodiments, the predetermined position of the fibrous matrix is determined from simulation software; alternatively, the simulation software includes Fibersim. The complex deformation area of the battery shell, which is easy to cause defects such as fiber breakage, wrinkling and the like, can be conveniently and rapidly predetermined through three-dimensional simulation software during design.
Specifically, in this embodiment, the complex deformation region is automatically cut, and the cut reinforcing sheet is fixed in the cut region by a binder, wherein the reinforcing sheet is generally a continuous glass fiber fabric that tends to be orthotropic, and is fixed by thermoplastic fixing nails.
S3, tensioning and fixing the reinforced matrix by adopting a clamping piece mechanism;
referring to fig. 2 and 3, in some embodiments, the clip mechanism includes a first clip 5 and a second clip 6; the first clamping piece 5 and/or the second clamping piece 6 are/is provided with a limiting needle 4; the first clamping piece 5 is provided with an edge pressing ball mechanism, the edge pressing ball mechanism comprises an edge pressing ball body 3 and an installation seat (not shown in the figure), the installation seat is connected to the first clamping piece 5, and the edge pressing ball body 3 is rotatably installed on the installation seat.
The mount pad can be installed in the one side that second clamping piece 6 was kept away from to first clamping piece 5, is equipped with the holding chamber in the mount pad, and the holding chamber can be slightly more than blank holder ball body 3, holding chamber size and shape also can match with blank holder ball body 3 to realize the roll of blank holder ball body 3, offered first blank holder ball hole 1 on the first clamping piece 5 simultaneously, the part of blank holder ball body 3 can wear out first blank holder ball hole 1 in order to realize compressing tightly to the reinforcement base member.
The second clamping piece 6 can be provided with a second blank pressing ball hole 2 so as to be matched with the blank pressing ball body 3 to compress the reinforcing matrix.
The first clamping piece 5 and the second clamping piece 6 realize clamping of the reinforced matrix through a locking mechanism, and the locking mechanism can be specifically a bolt structure, a buckling structure, a clamping structure, a bolt structure and the like.
Specifically, in this embodiment, the fabric (i.e. the reinforcing substrate) including the reinforcing sheet is transported by a transport roller and is fixed by a clamping piece mechanism having positioning and multi-scale tensioning functions, the clamping piece mechanism is formed by combining upper and lower frame type clamping pieces, and multi-scale and plane four-direction edge pressing is performed by a limit pin 4 and an edge pressing ball mechanism; the diameter of the blank pressing ball body 3 is 5-30mm, the distance is 30-60mm, the diameter ratio of the blank pressing ball body 3 to the first blank pressing ball hole 1 is 6:5-3:2, and the diameter ratio of the blank pressing ball body 3 to the second blank pressing ball hole 2 is 3:2-3:1; the limit needle 4 and the edge pressing ball mechanism are positioned on the upper clamping piece, and the corresponding area of the lower clamping piece is hollowed out; the limiting needle 4 and the blank holder ball mechanism are externally provided with polyurethane spraying prevention and blocking protection devices, the polyurethane spraying prevention and blocking protection devices are attached to the upper die and the lower die, the blank holder ball body 3 has any direction rotation capability, the multidirectional blank holder performance is improved, and meanwhile, the blank holder ball body 3 can rotate, so that the occurrence probability of tearing of the reinforcing matrix can be reduced when the reinforcing matrix is compressed. In order to further reduce the occurrence probability of tearing the reinforcing matrix, the number of the limiting pins 4 needs to be designed as small as possible, and in general, the limiting pins 4 are intensively distributed at the corner parts of the clip mechanism, and the edges of the clip mechanism are provided with 1 to 2 limiting pins.
S4, attaching thermosetting resin to the reinforcing matrix;
in some embodiments, the thermosetting resin comprises polyurethane. The polyurethane has excellent flame retardant property, and can improve the thermal runaway protection capability of the battery pack when being applied to the battery pack shell.
In some embodiments, the manner in which the thermosetting resin adheres to the reinforcing matrix includes spraying. The thermosetting resin is adhered to the reinforcing matrix in a spraying mode, the follow-up compression molding is carried out in a vacuum-assisted progressive compression molding mode, the infiltration of the thermosetting resin to the reinforcing matrix can be effectively improved, and the probability of defects of the battery pack shell is further reduced.
Specifically, in the embodiment, the mechanical arm clamps the clamping piece to the polyurethane spraying area, and polyurethane spraying on the front and back surfaces of the fabric is realized through plane reciprocating motion and overturning of the mechanical arm.
S5, installing a clamping piece mechanism fixed with a reinforcing matrix on a die to realize the transfer of the reinforcing matrix attached with thermosetting resin into the die;
in some embodiments, a silicone layer is laid in the mold; the thickness of the silica gel layer is 0.2-2 mm. The arrangement of the silica gel layer is beneficial to improving the forming capability of the reinforcing matrix in the die and improving the surface quality of the finally prepared battery pack shell. It should be noted that the silica gel layer may be placed in the mold before the reinforcing substrate is placed, or may be preset on the mold.
Specifically, in the embodiment, the reinforced matrix after being sprayed is transferred into the die by the clamping piece clamped by the manipulator, and the precise and rapid die entering is realized by the guide column on the die.
S6, carrying out compression molding on the reinforced matrix attached with the thermosetting resin to obtain a battery pack shell;
in some embodiments, the compression molding is performed by vacuum assisted progressive compression molding; the temperature of the heat preservation and pressure maintaining is 100-140 ℃; the time of heat preservation and pressure maintaining is 200-400 s. The vacuum assisted progressive die pressing mode is adopted, so that the infiltration of thermosetting resin to the reinforcing matrix can be effectively improved, and the probability of defects of the battery pack shell is further reduced.
Specifically, in this embodiment, a double-acting hydraulic forming device is adopted, after a blank holder die with controllable blank holder force is used for fast blank holder, a forming die is moved downwards, integrally deformed and precisely molded gradually according to a fast-medium-slow speed change, a reinforcing substrate is attached to the die, vacuumizing treatment is respectively carried out before and after die assembly, a glass fiber reinforced foamed polyurethane composite material is subjected to heat preservation and pressure maintaining in the die, an upper die is moved upwards fast, an ejection mechanism acts on a clamping piece to eject, a mechanical arm moves the glass fiber reinforced foamed polyurethane composite material out of the die, and the glass fiber reinforced foamed polyurethane composite material is cut and punched to the geometric dimension of a target member, so that a battery package shell is obtained. The vacuumizing treatment is specifically that the vacuumizing treatment is carried out twice at the edge parts of the upper die and the lower die successively before and after the progressive die forming is completed in a die assembly mode, wherein the vacuumizing time for the two times is 2-10s, and the interval is 5-20s.
According to the method, the defects of fiber breakage, wrinkling and the like in the deformation process of the fiber fabric are effectively prevented through the optimized matching of fabric cutting-reinforcing design, vacuum-assisted progressive die pressing, introduction of a silica gel soft die, multi-scale edge pressing control and the like, so that the integral formation of the continuous fiber reinforced resin matrix composite material into a complex component is possible. Meanwhile, a spraying type dipping method based on robot traction is adopted, dipping of fibers and resin is realized based on spraying and vacuum auxiliary molding means, progressive molding forming is matched with repeated vacuumizing on the basis of optimizing a fabric structure, rapid dipping and integral foaming solidification of polyurethane resin in the fabric along the thickness direction are effectively realized, the product density is further reduced, the process beat is reduced to 120 s/piece, and the manufacturing efficiency of the continuous fiber reinforced resin matrix composite is remarkably improved.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
A method of making a battery pack case, the method comprising:
the first step: for the continuous fiber reinforced polyurethane complex structure, 2 sheets of 150g/m are firstly selected 2 Chopped glass fiber mat and 2 sheets 600g/m 2 And cut the glass fiber square cloth to 2000mm x 1500mm, and symmetrically lay the glass fiber square cloth with the chopped glass fiber surface felt outside and the glass fiber square cloth inside.
And a second step of: automatic cutting is carried out on the complex deformation area, the cut continuous glass fiber fabric reinforcing sheet is fixed on the cutting area through a thermoplastic fixing nail with the melting point of 90 ℃ in a binding machine, and the binding overlap area is not less than 20mm.
And a third step of: the fabric containing the reinforcing sheet is transported by a transport roller, and is subjected to multi-scale and plane four-direction edge pressing fixation by a clamping piece mechanism containing a limiting needle and a group of edge pressing balls (the diameter of the group of edge pressing balls is 5mm, the distance is 30mm, the hole ratio of the edge pressing balls to the upper clamping piece of edge pressing balls is 3:2, and the hole ratio of the edge pressing balls to the lower clamping piece of edge pressing balls is 3:1).
Fourth step: the mechanical hand holds the clamping piece to the polyurethane spraying area, and polyurethane spraying on the front and back surfaces of the fabric is realized through plane reciprocating motion and overturning of the mechanical hand.
Fifth step: the sprayed fabric is transferred into the die by the clamping piece added by the mechanical hand, and the accurate and rapid die entering is realized by 8 guide posts on the die.
Sixth step: and (3) adopting double-acting hydraulic forming equipment, wherein the surfaces of the upper die and the lower die contain silica gel layers with the thickness of 0.2mm, after the rapid blank pressing of a blank pressing die with controllable blank pressing force, the forming die realizes downward movement, integral deformation and accurate progressive die pressing according to a fast-medium-slow speed, and the vacuum pumping treatment is sequentially carried out at the edge parts of the upper die and the lower die for two times before and after the progressive die pressing is completely closed, wherein the vacuum pumping time is 2s for two times, and the interval is 20s, so that the fabric die bonding is realized.
Seventh step: and (3) selecting the glass fiber reinforced foamed polyurethane composite material in a mould at the temperature of 100 ℃ for 200 seconds, and preserving heat and pressure.
Eighth step: the upper die moves upwards rapidly, the ejection mechanism acts on the clamping piece to eject, the glass fiber reinforced foaming polyurethane composite material is moved out of the die by a manipulator, and the glass fiber reinforced foaming polyurethane composite material is cut and punched to the geometric dimension of the target component, so that the battery pack shell is obtained.
Example 2
A method of making a battery pack case, the method comprising:
the first step: for the continuous fiber reinforced polyurethane complex structure, 2 sheets of 150g/m are firstly selected 2 Chopped glass fiber mat and 2 sheets 600g/m 2 Cutting the glass fiber twill cloth to 2000mm x 1500mm, and symmetrically paving the glass fiber twill cloth in a mode that the chopped glass fiber surface felt is arranged outside and the glass fiber square cloth is arranged inside.
And a second step of: automatic cutting is carried out on the complex deformation area, the cut continuous glass fiber fabric reinforcing sheet is fixed on the cutting area through a thermoplastic fixing nail with the melting point of 120 ℃ in a binding machine, and the binding overlap area is not less than 20mm.
And a third step of: the fabric containing the reinforcing sheet is transported by a transport roller, and is subjected to multi-scale and plane four-direction edge pressing fixation by a clamping piece mechanism containing a limiting needle and a group of edge pressing balls (the diameter of the group of edge pressing balls is 30mm, the distance is 60mm, the hole ratio of the edge pressing balls to the upper clamping piece of edge pressing balls is 6:5, and the hole ratio of the edge pressing balls to the lower clamping piece of edge pressing balls is 3:2).
Fourth step: the mechanical hand holds the clamping piece to the polyurethane spraying area, and polyurethane spraying on the front and back surfaces of the fabric is realized through plane reciprocating motion and overturning of the mechanical hand.
Fifth step: the sprayed fabric is transferred into the die by a mechanical hand and a clamping piece, and the accurate and rapid die entering is realized by 16 guide posts on the die.
Sixth step: and (3) adopting double-acting hydraulic forming equipment, wherein the surfaces of the upper die and the lower die contain silica gel layers with the thickness of 2mm, after the rapid blank pressing of a blank pressing die with controllable blank pressing force, the forming die realizes downward movement, integral deformation and accurate progressive die pressing according to a rapid-medium-slow speed change, and the vacuum pumping treatment is sequentially carried out at the edge parts of the upper die and the lower die for two times before and after the progressive die pressing is completely closed, wherein the vacuum pumping time is 10s for 5s at intervals, so that the fabric die bonding is realized.
Seventh step: and (3) selecting the glass fiber reinforced foamed polyurethane composite material in a mould at the temperature of 140 ℃ for 400 seconds, and preserving heat and pressure.
Eighth step: the upper die moves upwards rapidly, the ejection mechanism acts on the clamping piece to eject, the glass fiber reinforced foaming polyurethane composite material is moved out of the die by a manipulator, and the glass fiber reinforced foaming polyurethane composite material is cut and punched to the geometric dimension of the target component, so that the battery pack shell is obtained.
Example 3
A method of making a battery pack case, the method comprising:
the first step: for the continuous fiber reinforced polyurethane complex structure, 2 sheets of 150g/m are firstly selected 2 Chopped glass fiber mat and 2 sheets 600g/m 2 And cutting the glass fiber axial cloth to 2000mm x 1500mm, and symmetrically paving the glass fiber axial cloth in a mode that the chopped glass fiber surface felt is arranged outside and the glass fiber square cloth is arranged inside.
And a second step of: automatic cutting is carried out on the complex deformation area, the cut continuous glass fiber fabric reinforcing sheet is fixed on the cutting area through a thermoplastic fixing nail with the melting point of 100 ℃ in a binding machine, and the binding overlap area is not less than 20mm.
And a third step of: the fabric containing the reinforcing sheet is transported by a transport roller, and is subjected to multi-scale and plane four-direction edge pressing fixation by a clamping piece mechanism containing a limiting needle and a group of edge pressing balls (the diameter of the group of edge pressing balls is 15mm, the distance is 45mm, the hole ratio of the edge pressing balls to the upper clamping piece of edge pressing balls is 5:4, and the hole ratio of the edge pressing balls to the lower clamping piece of edge pressing balls is 2:1).
Fourth step: the mechanical hand holds the clamping piece to the polyurethane spraying area, and polyurethane spraying on the front and back surfaces of the fabric is realized through plane reciprocating motion and overturning of the mechanical hand.
Fifth step: the sprayed fabric is transferred into the die by a mechanical hand and a clamping piece, and the accurate and rapid die entering is realized by 12 guide posts on the die.
Sixth step: and (3) adopting double-acting hydraulic forming equipment, wherein the surfaces of the upper die and the lower die contain silica gel layers with the thickness of 1mm, after the rapid blank pressing of a blank pressing die with controllable blank pressing force, the forming die realizes downward movement, integral deformation and accurate progressive die pressing according to a rapid-medium-slow speed change, and the vacuum pumping treatment is sequentially carried out at the edge parts of the upper die and the lower die for two times before and after the progressive die pressing is completely closed, wherein the vacuum pumping time is 6s for two times, and the interval is 15s, so that the fabric die bonding is realized.
Seventh step: and (3) selecting the glass fiber reinforced foamed polyurethane composite material in a die at 120 ℃ for 300 seconds, and preserving heat and pressure.
Eighth step: the upper die moves up rapidly, the ejection mechanism acts on the clamping piece to eject, the glass fiber reinforced foaming polyurethane composite material is moved out of the die by the manipulator, and the glass fiber reinforced foaming polyurethane composite material is cut and punched to the geometric dimension of the target component.
Comparative example 1
A method of making a battery pack case, the method comprising:
the first step: for the continuous fiber reinforced polyurethane complex structure, 2 sheets of 150g/m are firstly selected 2 Chopped glass fiber mat and 2 sheets 600g/m 2 And cutting the glass fiber axial cloth to 2000mm x 1500mm, and symmetrically paving the glass fiber axial cloth in a mode that the chopped glass fiber surface felt is arranged outside and the glass fiber square cloth is arranged inside.
And a second step of: automatic cutting is carried out on the complex deformation area, the cut continuous glass fiber fabric reinforcing sheet is fixed on the cutting area through a thermoplastic fixing nail with the melting point of 130 ℃ in a binding machine, and the binding overlap area is not less than 20mm.
And a third step of: the fabric containing the reinforcing sheet is transported by a transport roller, and is subjected to multi-scale and plane four-direction edge pressing fixation by a clamping piece mechanism containing a limiting needle and a group of edge pressing balls (the diameter of the group of edge pressing balls is 15mm, the distance is 45mm, the hole ratio of the edge pressing balls to the upper clamping piece of edge pressing balls is 5:4, and the hole ratio of the edge pressing balls to the lower clamping piece of edge pressing balls is 2:1).
Fourth step: the mechanical hand holds the clamping piece to the polyurethane spraying area, and polyurethane spraying on the front and back surfaces of the fabric is realized through plane reciprocating motion and overturning of the mechanical hand.
Fifth step: the sprayed fabric is transferred into the die by a mechanical hand and a clamping piece, and the accurate and rapid die entering is realized by 12 guide posts on the die.
Sixth step: and (3) adopting double-acting hydraulic forming equipment, wherein the surfaces of the upper die and the lower die contain silica gel layers with the thickness of 1mm, after the rapid blank pressing of a blank pressing die with controllable blank pressing force, the forming die realizes downward movement, integral deformation and accurate progressive die pressing according to a rapid-medium-slow speed change, and the vacuum pumping treatment is sequentially carried out at the edge parts of the upper die and the lower die for two times before and after the progressive die pressing is completely closed, wherein the vacuum pumping time is 6s for two times, and the interval is 15s, so that the fabric die bonding is realized.
Seventh step: and (3) selecting the glass fiber reinforced foamed polyurethane composite material in a die at 120 ℃ for 300 seconds, and preserving heat and pressure.
Eighth step: the upper die moves up rapidly, the ejection mechanism acts on the clamping piece to eject, the glass fiber reinforced foaming polyurethane composite material is moved out of the die by the manipulator, and the glass fiber reinforced foaming polyurethane composite material is cut and punched to the geometric dimension of the target component.
Comparative example 2
A method of making a battery pack case, the method comprising:
the first step: for the continuous fiber reinforced polyurethane complex structure, 2 sheets of 150g/m are firstly selected 2 Chopped glass fiber mat and 2 sheets 600g/m 2 And cutting the glass fiber axial cloth to 2000mm x 1500mm, and symmetrically paving the glass fiber axial cloth in a mode that the chopped glass fiber surface felt is arranged outside and the glass fiber square cloth is arranged inside.
And a second step of: automatic cutting is carried out on the complex deformation area, the cut continuous glass fiber fabric reinforcing sheet is fixed on the cutting area through stainless steel fixing nails in the binding machine, and the binding overlap area is not less than 20mm.
And a third step of: the fabric containing the reinforcing sheet is transported by a transport roller, and is subjected to multi-scale and plane four-direction edge pressing fixation by a clamping piece mechanism containing a limiting needle and a group of edge pressing balls (the diameter of the group of edge pressing balls is 15mm, the distance is 45mm, the hole ratio of the edge pressing balls to the upper clamping piece of edge pressing balls is 5:4, and the hole ratio of the edge pressing balls to the lower clamping piece of edge pressing balls is 2:1).
Fourth step: the mechanical hand holds the clamping piece to the polyurethane spraying area, and polyurethane spraying on the front and back surfaces of the fabric is realized through plane reciprocating motion and overturning of the mechanical hand.
Fifth step: the sprayed fabric is transferred into the die by a mechanical hand and a clamping piece, and the accurate and rapid die entering is realized by 12 guide posts on the die.
Sixth step: and (3) adopting double-acting hydraulic forming equipment, wherein the surfaces of the upper die and the lower die contain silica gel layers with the thickness of 1mm, after the rapid blank pressing of a blank pressing die with controllable blank pressing force, the forming die realizes downward movement, integral deformation and accurate progressive die pressing according to a rapid-medium-slow speed change, and the vacuum pumping treatment is sequentially carried out at the edge parts of the upper die and the lower die for two times before and after the progressive die pressing is completely closed, wherein the vacuum pumping time is 6s for two times, and the interval is 15s, so that the fabric die bonding is realized.
Seventh step: and (3) selecting the glass fiber reinforced foamed polyurethane composite material in a die at 120 ℃ for 300 seconds, and preserving heat and pressure.
Eighth step: the upper die moves up rapidly, the ejection mechanism acts on the clamping piece to eject, the glass fiber reinforced foaming polyurethane composite material is moved out of the die by the manipulator, and the glass fiber reinforced foaming polyurethane composite material is cut and punched to the geometric dimension of the target component.
1000 battery pack cases were produced by the methods provided in examples 1 to 3 and comparative examples 1 to 2, and the probability of occurrence of fiber breakage defects of the battery pack cases is shown in the following table:
as can be seen from the above table, the probability of fiber breakage defect of the battery can body prepared by the method provided by the embodiment of the application is obviously lower, and the method provided by the embodiment of the application can improve the problem of fiber breakage of the battery can body.
The above is only a specific embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of making a battery pack case, the method comprising:
obtaining a fiber matrix;
cutting the preset position of the fiber matrix to form a cutting area on the fiber matrix, and connecting a reinforcing sheet to the fiber matrix to cover the cutting area to obtain a reinforcing matrix;
tensioning and fixing the reinforced matrix by adopting a clamping piece mechanism;
attaching a thermosetting resin to the reinforcing matrix;
mounting the clip mechanism to which the reinforcing matrix is fixed to a mold to effect transfer of the reinforcing matrix to which the thermosetting resin is attached to the mold;
carrying out compression molding on the reinforced matrix attached with the thermosetting resin to obtain a battery pack shell;
the reinforcing sheet is connected to the fiber matrix through a fixing piece, and the melting point of the fixing piece is not higher than the heat preservation and pressure maintaining temperature of compression molding.
2. The method of manufacturing a battery pack case according to claim 1, wherein the fixing member comprises a thermoplastic fixing pin.
3. The method of manufacturing a battery pack case according to claim 1, wherein the overlap area width of the reinforcing sheet and the fibrous base is not less than 20mm.
4. The method of manufacturing a battery pack case according to claim 1, wherein the reinforcing sheet comprises a glass fiber fabric, and glass fibers in the glass fiber fabric are orthogonally distributed.
5. The method of manufacturing a battery pack case according to claim 1, wherein the fiber base includes a chopped strand mat and a continuous fiber cloth that are stacked.
6. The method of manufacturing a battery pack case according to claim 1, wherein the preset position of the fiber substrate is determined by simulation according to simulation software; and/or
The simulation software includes Fibersim.
7. The method of manufacturing a battery pack housing of claim 1, wherein the clip mechanism comprises a first clip and a second clip; the first clamping piece and/or the second clamping piece are/is provided with a limiting needle; the first clamping piece is provided with a blank pressing ball mechanism, the blank pressing ball mechanism comprises a blank pressing ball body and an installation seat, the installation seat is connected to the first clamping piece, and the blank pressing ball body is rotatably installed on the installation seat.
8. The method of manufacturing a battery pack case according to claim 1, wherein the thermosetting resin comprises polyurethane.
9. The method for manufacturing a battery pack case according to claim 1, wherein a silica gel layer is laid in the mold; and/or
The thickness of the silica gel layer is 0.2-2 mm.
10. The method of manufacturing a battery pack case according to claim 1, wherein the manner in which the thermosetting resin is attached to the reinforcing base includes spraying; and/or
The compression molding is carried out in a vacuum-assisted progressive compression molding mode; and/or
The temperature of the heat preservation and pressure maintaining is 100-140 ℃; and/or
The time of heat preservation and pressure maintaining is 200-400 s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310706022.9A CN116834336A (en) | 2023-06-14 | 2023-06-14 | Preparation method of battery pack shell |
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