CN117601461A - Preparation method of high-strength steel plate composite material automobile body floor integrated battery upper cover - Google Patents
Preparation method of high-strength steel plate composite material automobile body floor integrated battery upper cover Download PDFInfo
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- CN117601461A CN117601461A CN202311839394.5A CN202311839394A CN117601461A CN 117601461 A CN117601461 A CN 117601461A CN 202311839394 A CN202311839394 A CN 202311839394A CN 117601461 A CN117601461 A CN 117601461A
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- steel plate
- upper cover
- pcm
- prepreg
- die
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000000465 moulding Methods 0.000 claims abstract description 25
- 238000007731 hot pressing Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 11
- 229920002799 BoPET Polymers 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000003475 lamination Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
- 238000005336 cracking Methods 0.000 abstract description 4
- 238000000748 compression moulding Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 238000003892 spreading Methods 0.000 description 5
- 230000007480 spreading Effects 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 241000234435 Lilium Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
Abstract
The invention provides a preparation method of an upper cover of a high-strength steel plate composite material vehicle body floor integrated battery, which comprises the following steps: preparing a PCM prepreg sheet; attaching a PET film to the outer side surface of the steel plate; the PCM prepreg sheets are spliced and then overlapped together and are paved on the inner side surface of the steel plate; plugging holes on the steel plate by using rubber particles; placing the product on a lower die of a hot-pressing die, and then preparing and forming the steel plate and the prepreg through the upper die and the lower die of the hot-pressing die in a matched heating and pressurizing mode to obtain a battery upper cover prefabricated member; and demolding the battery upper cover prefabricated part, and polishing to obtain a finished product of the integrated battery upper cover of the vehicle body floor. The invention realizes the composite molding process by applying the high-strength steel plate and the PCM prepreg for the first time, has high product strength, smooth and flat surface quality and good tightness, and realizes zero cracking during assembly; the production period is short, the operation is simple, the product percent of pass is improved, and the production cost is saved; the integrated body floor realizes the light weight of the whole vehicle.
Description
Technical Field
The invention belongs to the technical field of composite material forming processes, and particularly relates to a preparation method of an upper cover of a high-strength steel plate composite material vehicle body floor integrated battery.
Background
PCM Prepreg (pre, preimpregnated Materials), which is a Prepreg sheet product made by impregnating a Matrix (Matrix) in Reinforced continuous fibers (Reinforced fibers), is an intermediate material of composite materials, and is an important type of semi-finished composite materials, and has been developed very rapidly in recent years. The composite material prepared by the prepreg is corrosion-resistant, heat-resistant, light and high in strength, the part manufacturing process is simplified, the part processing and assembling processes are reduced, the production cost is reduced, the safety and reliability of the product are improved, the maintenance cost is reduced, the Life Cycle Cost (LCC) is reduced, and the light weight can be realized on the premise of meeting the material performance requirement. Therefore, the method is widely applied to industries such as automobile engineering, rail transit, building materials, aerospace and the like.
New energy automobiles are an industry which is currently being vigorously conducted in China. Most of the current battery upper covers of new energy automobiles are made of sheet metal parts and SMC materials, and the PCM prepreg composite material is adopted as a preferred material of the battery upper covers along with the gradual improvement of the light weight requirements.
The PCM composite material compression molding process is a method for cutting a pre-tightening material into a pre-designed material sheet through cutting equipment, accurately laying the material sheet on a spreading blank, continuously laying the layer number, then conveying the product into molding equipment, and curing and molding the product under the action of temperature and pressure. However, the current PCM composite material for manufacturing the battery top cap has the following problems: (1) When preparing a more complex battery upper cover product, a spreading blank body and a large number of tablets meeting the requirements need to be prepared in advance according to the shape of the product, more leftover materials are inevitably generated in the cutting process, each tablet needs to be positioned and spread on the blank body accurately, the operation is complicated, the period is long, and the comprehensive cost is high; (2) The PCM prepreg is easy to generate sand hole and pit in the forming process to cause the sealing failure of the product, and the material sheets are in butt joint paving and thickening area overlapping mode in the spreading process, so that the material sheets are easy to misplace, the fault tolerance is low, and the assembling process is easy to generate cracking due to overpressure; (3) The manufactured battery upper cover, the battery core and the lower tray are assembled and then are connected with the floor of the vehicle body, and the vehicle body is heavy and does not meet the requirement of light weight.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength steel plate composite material vehicle body floor integrated battery upper cover, which solves the following problems in the prior art: the spreading mode is complex and tedious, the operation is tedious and the cycle is long, the cost is high, the partial surface quality is easy to appear the sand hole in the production process, the pit leads to the leakproofness to lose efficacy, there is the risk of assembling the fracture during the installation, the whole car assembled battery package needs to be connected with the automobile body floor, the whole car weight increases.
In order to solve the technical problems, the invention provides a preparation method of an upper cover of a high-strength steel plate composite material vehicle body floor integrated battery, which comprises the following steps:
step 1: preparing a PCM prepreg sheet;
step 2: attaching a PET film to the outer side surface of the steel plate;
step 3: the PCM prepreg sheets are spliced, overlapped and paved on the inner side surface of the steel plate;
step 4: plugging holes on the high-strength steel plate by using rubber particles;
step 5: placing the product on a lower die of a hot-pressing die, and then preparing and forming the steel plate and the prepreg through the upper die and the lower die of the hot-pressing die in a matched heating and pressurizing mode to obtain a battery upper cover prefabricated member;
step 6: and demolding the battery upper cover prefabricated part, and polishing to obtain a finished product of the integrated battery upper cover of the vehicle body floor.
Preferably, in step 2, the PET film-fit interference lap joint needs to be fully adhered to the steel plate, and the width and length of the multiple PET film interference lap joints do not need to be accurately positioned, and then the roller is used for compaction.
Preferably, in step 3, the PCM prepreg is spliced into a product with a required shape, multi-layer lamination is performed according to a required thickness, and then the laminated PCM prepreg is laminated with the inner side surface of the steel plate in a hole-to-hole positioning manner.
Preferably, in step 4, the plugging includes plugging all of the assembly holes on the steel plate with rubber particles having a diameter at least 0.15mm greater than the diameter of the holes.
Preferably, in step 5, the temperature of the hot press upper die is 140 ℃ to 150 ℃, and the temperature of the hot press lower die is 130 ℃ to 140 ℃.
Preferably, in step 5, the molding pressure of the hot pressing upper and lower molds includes a first stage compression molding pressure of 80 to 120T and a second stage compression molding pressure of 400 to 600T.
Preferably, in step 5, the molding time of the hot pressing upper and lower molds includes a first molding time period of 10 to 20 seconds and a second molding time period of 280 to 340 seconds.
Preferably, in step 5, the hot-pressing mold is a metal steel mold, and the upper and lower molds of the hot-pressing mold adopt a hard-pressing double-sided mold structure.
Preferably, in the step 6, the peel strength of the PCM composite layer and the steel plate layer of the upper cover of the vehicle body floor integrated battery is more than or equal to 180N/m, and the dyne value of the surface of the PCM composite layer is more than or equal to 48.
Preferably, in step 6, the sander is an SFR-RD1450 broadband sander.
Preferably, the steel sheet has a yield strength of at least 180MPa. The steel plates include, but are not limited to, steel plates of types HC340, 590DP, HC380, 590TR, DP780, etc.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention realizes the composite molding process by applying the high-strength steel plate and the PCM prepreg for the first time, has high product strength, smooth and flat surface quality and good tightness, and realizes zero cracking of assembly at the customer site;
(2) The production period is short, the operation is simple, the product percent of pass can be improved from 96% to 99%, and the production cost is greatly saved;
(3) The integrated car body floor realizes the light weight requirement of the whole car and the mass production application of the high-strength steel plate composite material in the production of the upper cover of the battery of the new energy automobile.
Drawings
Fig. 1 is a flow chart of a preparation process of the high-strength steel plate composite material vehicle body floor integrated battery upper cover.
Fig. 2 is a schematic diagram of a mold structure used in the method for manufacturing the upper cover of the high-strength steel plate composite material vehicle body floor integrated battery.
Fig. 3 is a schematic structural view of the high-strength steel plate composite material vehicle body floor integrated battery upper cover of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is further described below with reference to specific examples and drawings. It should be understood that the embodiments and figures described below are illustrative only and are not limiting on the scope of the present application.
As shown in fig. 1, the preparation process flow chart of the high-strength steel plate composite material vehicle body floor integrated battery upper cover comprises the following steps:
(1) The PCM prepreg is prepared and may be any PCM prepreg commonly used in the art that is suitable for preparing battery covers, typically having a size of 1270mm in width.
(2) A PET (polyethylene terephthalate) film was attached to the outer side surface of the steel plate (i.e., the side opposite to the battery top cover, also referred to as "a side"); specifically, the PET film is matched with the interference lap joint to be fully adhered with a steel plate, the width and the length of the interference lap joint of a plurality of PET films do not need to be accurately positioned, and then a roller is used for compaction.
(3) The PCM prepreg sheets are spliced together and laid down on the inner side surface of the steel plate (i.e., the side facing the battery top cover, also referred to as the "B-side"). The specific paving mode is as follows: and splicing the PCM prepreg sheets into the size of the required shape of the product, performing multi-layer (for example, two layers or more than two layers) lamination according to the required thickness, and then taking the laminated PCM prepreg sheets to laminate with the inner side surface of the steel plate in a hole-to-hole positioning mode.
(4) And plugging the hole on the steel plate by using rubber particles. Prevent the prepreg from entering the hole site to cause blockage during compression molding. The hole plugging operation specifically comprises the following steps: all assembly hole sites on the steel plate are blocked by rubber particles, and the diameter of the rubber particles is at least 0.15mm larger than that of the hole sites, so that the hole sites are blocked, and good sealing performance is realized. If the diameter of the rubber particles is the same as or different from the hole site by less than 0.15mm, it will be difficult to achieve a sealing effect.
(5) And placing the product on a lower die of a hot-pressing die, and then preparing and forming the steel plate and the prepreg through the upper die and the lower die of the hot-pressing die in a matched heating and pressurizing mode to obtain the battery upper cover prefabricated part. The die closing speed parameter of the press is 3-7 mm/s; the temperature of the hot pressing upper die is 140-150 ℃, and the temperature of the hot pressing lower die is 130-140 ℃. The molding time of the upper and lower hot pressing molds comprises a first section of molding time and a second section of molding time, wherein the first section of molding time is 10 to 20 seconds, and the second section of molding time is 280 to 340 seconds. The molding pressure of the upper and lower hot molds comprises a first stage of compression molding and a second stage of compression molding, wherein the first stage of compression molding pressure is 80-120T, and the second stage of compression molding pressure is 400-600T. Namely, the compression molding is a segment compression molding: the first stage is molded at a pressure of 80 to 120T for 10 to 20 seconds, and the second stage is molded at a pressure of 400 to 600T for 280 to 340 seconds. The hot-pressing die is preferably a metal steel die, and the upper die and the lower die of the hot-pressing die adopt a hard-pressing double-sided die structure.
(6) And demolding the battery upper cover prefabricated part, and polishing (a polisher is an SFR-RD1450 broadband sander) to obtain a finished product of the integrated battery upper cover of the vehicle body floor.
Comparative example
One of the key points of the preparation process of the high-strength steel plate composite material vehicle body floor integrated battery upper cover is that various parameters in the compression molding process, such as mold temperature, compression molding time and compression molding pressure, are reasonably controlled, and any parameter changes can influence the performance of the final vehicle body floor integrated battery upper cover finished product.
Using the above procedure, referring to the following table, a vehicle body floor integrated battery upper cover was prepared under different conditions. The model of the PCM prepreg is BAC-449C-41450-50, the manufacturer is Zhejiang lily avionics composite material Co., ltd, the model of the high-strength steel plate is HC340, and the manufacturer is Shanghai Bao steel trade Co., ltd.
Fig. 3 shows a schematic structural view of the high-strength steel plate composite material vehicle body floor integrated battery upper cover manufactured by the method of the invention. As shown, the battery top cover includes a PCM prepreg and a high strength steel plate laminated by compression molding, and the prepreg has rubber particles therein. Through mould pressing complex, make the PCM prepreg that melts and fuse and high strength steel sheet can further combine the shaping, the intensity of automobile body floor integrated battery upper cover goods can effectively strengthen, form the automobile body floor integrated battery upper cover of high strength, make the tensile strength of battery upper cover goods be greater than or equal to 480MPa, the peel strength of PCM composite layer and steel sheet layer be greater than or equal to 180N/m, the dyne value on PCM composite layer surface is greater than or equal to 48, can bond with the battery well, solve the assembly fracture, lightweight problem, thereby obtain the product that intensity is high, the leakproofness is good, adhesive force is good.
Preferably, the high strength steel sheet used in the present invention has a yield strength of at least 180MPa. Suitable steel sheets for use in the present invention include, but are not limited to, steel sheets of the types HC340, 590DP, HC380, 590TR, DP780, etc., which have sufficient strength to be suitable for use as body floors of automobiles.
Fig. 2 shows a schematic diagram of a die structure of the method for manufacturing the upper cover of the high-strength steel plate composite material vehicle body floor integrated battery, wherein the press die used in the method comprises an upper die 1 and a lower die 2, the upper die 1 is electrically connected with a press control panel 7, related molding parameters (including molding pressure, molding time, dwell time, molding temperature and the like) can be input through the press control panel 7, the pressing action of the upper die 1 is controlled, and rubber particles 3, PCM prepregs 4, high-strength steel plates 5 and a PET protective film 6 are integrally attached on the lower die 2, so that the compression molding process is realized. The press may be any die-closing press commonly used in the art. For simplicity and clarity, other components of the press are not shown in fig. 2, however, those skilled in the art will appreciate that the press includes other components, including but not limited to brackets, actuation mechanisms, etc., in addition to the upper die 1, lower die 2, and press control panel 7 shown in fig. 2.
In conclusion, the high-strength steel plate and the PCM are firstly applied to realize the composite molding process, so that the product strength is high, and zero cracking of assembly at the customer site can be realized; in addition, the spreading process is simple, the operation time is low, the material utilization rate is high, the production period is short, the product qualification rate can be improved from 96% to 99%, and the production cost is greatly saved; the integrated car body floor realizes the light weight requirement of the whole car and the mass production application of the high-strength steel plate composite material in the production of the upper cover of the battery of the new energy automobile.
Claims (10)
1. The preparation method of the high-strength steel plate composite material vehicle body floor integrated battery upper cover is characterized by comprising the following steps of:
step 1: preparing a PCM prepreg sheet;
step 2: attaching a PET film to the outer side surface of the steel plate;
step 3: the PCM prepreg sheets are spliced and then overlapped together and are paved on the inner side surface of the high-strength steel plate;
step 4: plugging holes on the steel plate by using rubber particles;
step 5: placing the product on a lower die of a hot-pressing die, and then preparing and forming the steel plate and the prepreg through the upper die and the lower die of the hot-pressing die in a matched heating and pressurizing mode to obtain a battery upper cover prefabricated member;
step 6: and demolding the battery upper cover prefabricated part, and polishing to obtain a finished product of the integrated battery upper cover of the vehicle body floor.
2. The method according to claim 1, wherein in step 2, the PET film is attached to the steel plate by interference fit and the width and length of the PET film are not accurately positioned, and then the PET film is compressed by a roller.
3. The method according to claim 1, wherein in step 3, the PCM prepreg is spliced into a desired shape of the product, multi-layer lamination is performed according to a desired thickness, and then the laminated PCM prepreg is laminated to the inner side of the steel plate in a hole-to-hole positioning manner.
4. The method of claim 1, wherein in step 4, the plugging holes comprises plugging all assembly holes on the steel plate with rubber particles having a diameter at least 0.15mm greater than the diameter of the holes.
5. The method according to claim 1, wherein in step 5, the upper hot press die has a temperature of 140 ℃ to 150 ℃ and the lower hot press die has a temperature of 130 ℃ to 140 ℃.
6. The method according to claim 1, wherein in step 5, the molding pressure of the hot press upper and lower molds includes a first stage molding pressure of 80 to 120T and a second stage molding pressure of 400 to 600T.
7. The method according to claim 1, wherein in step 5, the molding time of the hot press upper and lower molds includes a first stage molding time of 10 to 20 seconds and a second stage molding time of 280 to 340 seconds.
8. The method according to claim 1, wherein in step 6, the peel strength of the PCM composite layer and the steel plate layer of the upper cover of the vehicle body floor integrated battery is not less than 180N/m, and the dyne value of the surface of the PCM composite layer is not less than 48.
9. The method according to claim 1, wherein in step 5, the hot-press mold is a metal steel mold, and the upper and lower molds of the hot-press mold are of a hard-press double-sided mold structure.
10. The method of manufacturing according to claim 1, wherein the steel sheet has a yield strength of at least 180MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311839394.5A CN117601461A (en) | 2023-12-28 | 2023-12-28 | Preparation method of high-strength steel plate composite material automobile body floor integrated battery upper cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311839394.5A CN117601461A (en) | 2023-12-28 | 2023-12-28 | Preparation method of high-strength steel plate composite material automobile body floor integrated battery upper cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117601461A true CN117601461A (en) | 2024-02-27 |
Family
ID=89960017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311839394.5A Pending CN117601461A (en) | 2023-12-28 | 2023-12-28 | Preparation method of high-strength steel plate composite material automobile body floor integrated battery upper cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117601461A (en) |
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2023
- 2023-12-28 CN CN202311839394.5A patent/CN117601461A/en active Pending
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