CN115882154A - Composite metal combined battery pack upper cover and forming method and device thereof - Google Patents
Composite metal combined battery pack upper cover and forming method and device thereof Download PDFInfo
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- CN115882154A CN115882154A CN202211428472.8A CN202211428472A CN115882154A CN 115882154 A CN115882154 A CN 115882154A CN 202211428472 A CN202211428472 A CN 202211428472A CN 115882154 A CN115882154 A CN 115882154A
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- 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
Abstract
The invention discloses an upper cover of a composite metal combined battery pack, which comprises a strong supporting layer and a composite material layer, wherein the composite material layer completely wraps the strong supporting layer inside and forms a sandwich structure; the strong supporting layer is made of a metal material; the composite material layer is an epoxy resin-based glass fiber reinforced composite material, and epoxy resin is located on the inner side of glass fibers. A molding method and a corresponding molding apparatus are also included. The invention adopts a sandwich type interlayer process, realizes the multi-surface coupling fixation of the front surface and the side edge of the interface, improves the bonding effect between materials and reduces the cracking probability.
Description
Technical Field
The invention relates to the field of battery pack upper covers, in particular to a composite metal combined battery pack upper cover and a forming method and device thereof.
Background
The battery pack upper cover is applied to the field of electric vehicle bodies, and is mainly used for protecting the battery pack, buffering the battery in the impact process and protecting the battery from being corroded by the external environment. The existing battery pack upper cover can be made of various materials, such as a steel upper cover, an aluminum alloy upper cover, a composite material upper cover and the like.
Wherein:
the steel battery pack upper cover is made of steel plates through punching and welding, the steel battery pack upper cover is high in strength, simple in machining process, less in waste generated in the production process and low in cost, the requirements of the battery pack upper cover on functions, appearance and the like can be met, the punching die can be made simply, the cost is reduced, and the production cost is saved.
The aluminum alloy battery pack upper cover is made of aluminum plates through punching and welding, and is low in cost, good in heat conductivity, fast in heat dissipation, easy to produce, free of pollution, high in durability and convenient to maintain.
The composite material battery pack upper cover is generally formed by die pressing, and has the advantages of light weight, good insulating property, high corrosion resistance and strong flame-retardant and heat-insulating capabilities.
However, the steel and aluminum alloy battery pack upper covers have the outstanding problems of high weight and poor corrosion resistance due to the material characteristics, and the composite material battery pack upper cover has low strength and is easy to deform due to low material modulus. Therefore, in the existing battery pack upper cover structure, different advantages and defects exist in the performances of the steel upper cover, the aluminum alloy upper cover and the composite material upper cover, and the requirements on the performances are difficult to meet while the weight is reduced.
In addition, in current combined type structure, there is not effectual solidification between the multilayer material, and the dislocation layering easily takes place between the multilayer when receiving the striking, leads to its structure unstable, easily ftractures after the striking to after pressing the lid, still need carry out the banding to the edge of lid and handle, this banding and lid are not integrated into one piece structure, lead to the easy fracture of lid edge at later stage.
Disclosure of Invention
The invention aims to provide an upper cover of a composite metal combined battery pack and a forming method and a forming device thereof, and aims to solve the technical problem that the advantages and the disadvantages of different types of materials cannot be complemented in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
the invention provides a composite metal combined battery pack upper cover, which comprises a strong supporting layer and a composite material layer, wherein the composite material layer completely wraps the strong supporting layer inside and forms a sandwich structure;
wherein:
the strong supporting layer is made of a metal material;
the composite material layer is an epoxy resin-based glass fiber reinforced composite material, and epoxy resin is located on the inner side of glass fibers.
The invention also provides a forming method of the composite metal combined battery pack upper cover, which comprises the following steps:
sequentially stacking the composite material layer, the strong support layer and the composite material layer to form a set single body, and preliminarily pressing the set single body in the vertical direction;
after the preliminary pressing is finished, carrying out wrapping integrated pressing forming on the collective monomer;
carrying out local interface coupling on the integrated pressing formed collection monomer;
selecting any starting point for the set monomer, and performing annular pressing outwards from the starting point according to a specified direction until the composite material layer is completely attached to the surface of the strong support layer;
and performing interface coupling on the collection monomer again, and performing secondary overall wrapping type annular pressing on the collection monomer after the interface coupling is completed until the collection monomer is cooled and formed.
As a preferred scheme of the invention, in the process of compression molding, the method specifically comprises the following steps:
in the vertical direction, carrying out central mould pressing on the superposed position of the strong support layer and the two composite material layers to form a cavity;
in the central die pressing process, the edge of the die cavity is subjected to boundary die pressing in the vertical direction, and the boundary of the two composite material layers has the tendency of being transversely close to the peripheral side of the strong support layer in the vertical extrusion process;
and stopping the central molding and the boundary molding simultaneously to obtain the battery pack upper cover.
As a preferable scheme of the invention, in the stacking process, equidistant edge strips are left between the boundary of the strong support layer and the boundary of the composite material layer;
in the boundary mould pressing process, the mould at the periphery of the cavity drives the edge strip to be turned over towards the advancing direction of the mould, and the edge strip moves and is attached to the periphery of the strong supporting layer under the extrusion of the mould until the interface is coupled.
In addition, the invention also provides a forming device of the composite metal combined battery pack upper cover, which comprises:
the central die is provided with a pressing plane, the central die presses the strong support layer and the composite material layer stacked on the pressing plane through a first driving group, the composite material layers on the upper side and the lower side are continuously heated and pressed in a cavity of the central die until contact interfaces of two different materials are coupled, and at least one edge strip arranged on the composite material layers is convexly arranged on the outer side of the central die;
the limit clamping ring subassembly slides through second drive group and sets up week side of center mould, the inner wall laminating of limit clamping ring subassembly is in on the outer wall of center mould, the combined material layer pressurized in-process, two upper and lower rings of limit clamping ring subassembly are to convex the strake removes, makes the strake to the direction of strong supporting layer place is buckled, and receives the inside extrusion force of ring, the strake under the extrusion with the side boundary coupling of strong supporting layer.
As a preferable scheme of the present invention, the edge pressing ring assembly includes an upper pressing ring body sliding on the lower end of the central mold through a second driving unit, and a lower pressing ring body sliding on the upper end of the central mold, and both the upper pressing ring body and the lower pressing ring body can move to the other end of the central mold through the pressing plane;
the upper pressing ring body and the lower pressing ring body can be attached to the outside of the pressing plane and absorb heat overflowing from the central mold, and the pressing action of the central mold and the pressing actions of the upper pressing ring body and the lower pressing ring body have time difference.
As a preferable scheme of the present invention, the upper pressure ring body and the lower pressure ring body are both provided with a cutting tip, and when the upper pressure ring body and the lower pressure ring body are attached together, the ends of the two cutting tips are attached together and cut more than one edge strip.
As a preferred scheme of the present invention, the cutting tips are disposed on the outer walls of the upper pressure ring body and the lower pressure ring body, so that a corner gap is disposed between the upper pressure ring body and the lower pressure ring body, the edge strip is formed into a demolding angle strip in the corner gap, and the demolding angle strip is disposed at the edge of the upper cover of the battery pack.
As a preferable scheme of the present invention, the second driving group includes a plurality of oil pumps respectively disposed at the upper and lower sides of the central mold, the oil pump located below is connected to the lower pressing ring body through a screw rod, and when the stacked strong support layer and the composite material layer are fed to the pressing plane, the lower pressing ring body is driven by the screw rod to move to the pressing plane and fix the edge strips on the composite material layer.
Compared with the prior art, the invention has the following beneficial effects:
according to the battery pack upper cover, the advantages of the metal material and the composite material are integrated by using the mode of integrally forming the metal and the epoxy resin-based glass fiber material, the overall performance of the upper cover is improved, the sandwich type interlayer process is adopted structurally, the metal material is completely coated in the composite material, the acid and alkali resistance of the strong supporting layer is improved, the coupling solidification is carried out between interfaces through pressing, the interface strength is improved, the battery pack upper cover has a stable structure, the probability of dislocation and layering when being impacted is reduced, and the cracking probability of the edge of the cover body after being impacted is reduced.
In addition, the invention effectively eliminates air possibly generated in the material interface during pressing by adopting a step-by-step pressing mode, increases the curing effect of the interface and further prevents the material from layering and cracking in the later period; and the boundary of the material is further pressed while pressing, so that the composite material can fully coat the metal material, and the cracking probability of the edge of the upper cover is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic side view of a partial structure of an upper cover of a composite metal assembled battery pack according to the present invention;
FIG. 2 is a schematic view of the structure of the edge strip of the present invention
FIG. 3 is a schematic structural diagram of a strong support layer and a composite layer stacked together according to the present invention;
fig. 4 is a schematic structural diagram of a forming device for an upper cover of a composite metal combined battery pack according to the present invention;
fig. 5 is a schematic structural view showing a pressing trend of a molding device for an upper cover of a composite metal assembled battery pack according to the present invention;
fig. 6 is a schematic side view of a partial structure of an upper cover of a composite metal assembled battery pack according to the present invention;
fig. 7 is a schematic view of a side-coating partial structure of an upper cover of a composite metal assembled battery pack according to the present invention.
The reference numerals in the drawings denote the following, respectively:
1-a strong support layer; 2-a composite layer; 3-edge banding; 4-a central mold; 5-a first drive group; 6-a second drive group; 7-an edge compression ring assembly; 8-cutting the tip; 9-demoulding angle bars;
601-an oil pump; 602-a screw mandrel;
701-an upper press ring body; 702-pressing the ring body down.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to material classification, the main types of the upper covers of the battery packs in the market at the present stage are three types: steel upper cover, aluminum alloy upper cover, combined material upper cover.
For the three types of covers described above, the following technical problems are summarized:
(1) The composite material battery pack upper cover has low compressive strength and modulus, and can not bear too large impact force value when the electric vehicle is in special working conditions such as collision, and the upper cover is easy to deform such as dent.
(2) Under the condition of thermal runaway of the battery, the thermal runaway explosion spraying temperature of the battery can reach 600-700 ℃, the fire resistance and the fire resistance indexes of the aluminum alloy upper cover are insufficient, and the aluminum alloy upper cover cannot resist high temperature and is easy to burn and melt.
(3) The metal battery pack upper cover has high density and heavy finished product mass, and can increase the whole weight of the automobile, thereby increasing energy loss.
In order to solve the problems, the invention provides a novel composite material metal combined type battery pack upper cover and a forming method thereof by using a mode of integrally forming metal and epoxy resin-based glass fiber materials, integrates the advantages of metal materials and composite materials, and improves the overall performance of the upper cover.
As shown in fig. 1 to 3, the invention provides a composite metal combined battery pack upper cover, which adopts a sandwich structure and comprises a strong support layer (1) and a composite material layer (2) which completely wraps the strong support layer (1) in the inner part and forms the sandwich structure, wherein the strong support layer 1 is made of a metal material, the composite material layer 2 is made of an epoxy resin-based glass fiber reinforced composite material, and the epoxy resin is positioned on the inner side of the glass fiber.
On the upper part
The lower two layers of composite material layer 2 extend to the edge of the strong support layer 1 and are connected together, the strong support layer 1 is wrapped in the composite material layer 2 and forms a sandwich structure, the protruding structure in fig. 2 is an edge strip 3 arranged on the composite material layer 2, and the edge strip 3 is used for being coupled with the side boundary of the strong support layer 1 during press forming.
The invention particularly provides an upper cover of a battery pack, which comprises a strong supporting layer and a composite material protective layer, and particularly relates to an upper cover of a battery pack, which is made of a metal material and epoxy resin-based glass fiber. The upper cover is integrally formed by adopting a metal material for supporting and a composite material for corrosion protection, and has a three-layer structure, wherein metal (steel plates/aluminum plates/steel wires) is used as a middle layer of the upper cover to improve the integral strength of the upper cover of the battery pack, and the upper cover can be called as a strong supporting layer; the fiber reinforced resin matrix composite material is used as an upper layer and a lower layer of the upper cover, metal is wrapped in the composite material, the metal material is directly contacted with the epoxy resin matrix positioned on the inner side, the metal material for supporting is prevented from being contacted with the outside, and the metal is prevented from being corroded.
In actual production, the difficulty between multiple layers of material is the layer-to-layer connection, and the handling of material boundaries.
In the present invention
In the invention, the connection principle of the upper cover of the composite metal combined battery pack is as follows;
the strong supporting layer 1 and the composite material layer 2 are pressed together by pressing, and the interfaces of the strong supporting layer and the composite material layer form coupling, so that strong connection is formed between the interfaces of the materials, and the materials are not easy to crack;
and through the processing to strake 3, laminate strake 3 on strong supporting layer 1's side boundary for strake 3 also carries out the coupling with strong supporting layer 1's side boundary, forms the bonding of homogeneous material between strake 3 and the strake 3, has strengthened the connection effect at battery package upper cover edge, is difficult for the fracture.
In order to realize the connection mode, the invention further provides a forming method of the composite material metal combined type battery pack upper cover, which comprises the following specific processes:
cleaning and processing the surface of the metal, and cutting the metal into a proper size to prepare a strong supporting layer, wherein the surface cleaning and processing process is different according to different materials of the strong supporting layer, the strong supporting layer can be an aluminum plate/steel wire, and the acid washing or alkali washing, electrophoresis or anodic oxidation and the like can be carried out according to the characteristics of the metal to process and clean burrs on the surface of the strong supporting layer;
blanking, cutting and layering the composite material to prepare a composite material layer;
the method comprises the steps of sequentially stacking a composite material layer, a strong support layer and the composite material layer to form a set monomer, specifically, placing the strong support layer between two flaky composite material layers, and sequentially stacking the strong support layer and the composite material layer to enable the composite material layer to be completely coated on the surface of the strong support layer, so that a metal material is isolated from the outside to obtain the sandwich material.
It is right the collection monomer carries out preliminary suppression in vertical direction, it is right after accomplishing preliminary suppression the collection monomer carries out the integration compression moulding of parcel nature, to through integration compression moulding the collection monomer carries out local interface coupling, specifically is:
the sandwich material is placed on a die, the center of the sandwich material is subjected to central die pressing in the vertical direction by using a hot-pressing die, and under the action of temperature and pressure, the contact interfaces of the strong supporting layer and the upper and lower composite material layers are coupled in the pressing process.
Selecting any starting point for the collection monomer, and performing ring pressing outwards from the starting point according to a specified direction until the composite material layer is completely attached to the surface of the strong support layer, such as:
in the center mould pressing process, because the strake is the edge that the protrusion set up at the mould, the event uses the boundary mould to turn over the book to the direction that advances towards the mould in vertical direction, turn over the back and remove to the boundary of strong supporting layer in the extrusion lower strake of mould on the horizontal direction, make the edge of combined material layer and the laminating of week side of metal material, the strake couples gradually under the pressure with the boundary side of strong supporting layer, and the strake that is located both sides about respectively bonds together, the final solidification becomes integrative, make and carry out complete cladding to the boundary side of strong supporting layer.
And performing interface coupling on the collection monomer again, and performing secondary overall wrapping type annular pressing on the collection monomer after the interface coupling is completed until the collection monomer is cooled and formed.
The composite material layer is characterized in that the area of the composite material layer is larger than that of the strong support layer, so that equidistant edge strips are reserved between the boundary of the strong support layer and the boundary of the composite material layer, the two edge strips deform towards the direction of the strong support layer through boundary mould pressing until the two edge strips are attached together, and when the edge strips are pressed together, the boundary of the strong support layer is completely covered.
In actual production, different reinforced fibers and resin matrixes can be selected according to comprehensive consideration of mechanical properties and cost required by the upper cover, and metal materials with different densities and laying modes can be determined.
The method has the advantages that the boundary of the material is modified in the pressing process, so that the material is integrally formed in the pressing process, the die for boundary die pressing can absorb heat for the central die pressing die, the side face of the boundary of the metal material is also coupled and connected with the composite material, the side face of the metal material is protected, the die pressing process is located in the same film pressing time interval, the film pressing forming time cannot be increased due to the fact that the edge strips are processed, and the later-stage modification of the edge of the upper cover of the battery pack can be reduced.
In actual production, because the pressing mold cavity is different, the edge strip positioned above or the edge strip positioned below protrudes, the pressing direction of the edge strip needs to be changed according to actual needs, and more edge strips need to be cut. This method of manufacture is difficult to achieve with conventional dies, because in this method, two dies are required to be nested together, and the two dies are required to act separately to achieve the pressing of the material,
as shown in fig. 3 to 7, the present invention further provides a forming apparatus for forming an upper cover of a composite metal assembled battery pack, which includes a central mold 4 and an edge pressing ring assembly 7 sleeved outside the central mold 4, wherein the edge pressing ring assembly and the central mold are respectively driven by a first driving set 5 and a second driving set 6.
Specifically, a pressing plane is arranged on the central die 4, the upper end and the lower end of the central die 4 are opened and closed on the pressing plane through the first driving group 5, and the stacked strong supporting layer and the composite material layer are horizontally placed on the pressing plane. The central mold 4 presses the strong support layer and the composite material layer stacked on the pressing plane through the first driving group 5, the composite material layers on the upper side and the lower side are continuously heated and pressed in the cavity of the central mold 4 until the contact interfaces of two different materials are coupled, and at least one edge strip arranged on the composite material layers is arranged outside the central mold 4 in a protruding mode.
The limit clamping ring subassembly 7 slides through second drive group 6 and sets up in the week side of central mould 4, and the inner wall laminating of limit clamping ring subassembly 7 is on the outer wall of central mould 4, and the combined material layer pressurized in-process, two upper and lower rings body of limit clamping ring subassembly 7 remove to convex strake for the strake is buckled to the direction at strong supporting layer place, and receives the inside extrusion force of ring body, and the strake is under the extrusion with the side boundary coupling of strong supporting layer.
In order to press the edge strips 3 at different positions conveniently, the edge pressing ring assembly 7 includes an upper pressing ring body 701 sliding at the lower end of the central mold 4 through the second driving group 6 and a lower pressing ring body 702 sliding at the upper end of the central mold 4, and both the upper pressing ring body 701 and the lower pressing ring body 702 can pass through the pressing plane to move to the other end of the central mold 4.
When the edge strip 3 positioned below protrudes, the upper pressure ring body 701 rises and pushes the edge strip 3 positioned below to turn upwards and keep at the position of a pressing plane;
when the edge strip 3 positioned above protrudes, the lower pressing ring body 702 rises and pushes the edge strip 3 positioned above to turn downwards and keep the position of the pressing plane;
when being located two upper and lower square strake 3 and all protruding, when two rings body move to the suppression plane simultaneously, strake 3 turns over in opposite directions, and the material that is more than is cut by the ring body under the extrusion.
The upper pressure ring body 701 and the lower pressure ring body 702 can be attached to the outside of the pressing plane and absorb the heat overflowing from the central mold 4, and the pressing action of the central mold 4 has a time difference with the pressing action of the upper pressure ring body 701 and the lower pressure ring body 702.
Specifically, when strake 3 that is located the below is protruding, the last pressure ring body 701 that sets up in central mould 4 below passes the system plane under the drive of second drive group 6 and moves upwards, because the inner wall of last pressure ring body 701 is the laminating on the outer wall of central mould 4, so can promote strake 3 that is located the below and upwards move, make the inboard of strake 3 and the border side contact of strong supporting layer, this moment because strong supporting layer has certain heat under the heating of central mould 4, and go up pressure ring body 701 and just can absorb the heat of central mould 4 release itself, so the medial surface of strong supporting layer and strake 3 can couple under the pressure effect, strake 3 that is located the below upwards can contact the combined material layer that is located the top, under the strake 3 that is located the below extrude down with the combined material layer that is located the top bonding, make the combined material layer wrap up on strong supporting layer completely.
Correspondingly, when strake 3 that is located the top is protruding, the setting passes down pressing ring body 702 in central mould 4 top and presses the downward motion of pressure plane under the drive of second drive group 6, because the inner wall that pushes down ring body 702 also is the laminating on the outer wall of central mould 4, so can promote the strake 3 that is located the top and move downwards, make the inboard of strake 3 and the border side contact of strong supporting layer, this moment because strong supporting layer has certain heat under central mould 4's heating, and push down ring body 702 and just can absorb the heat that central mould 4 released itself, so strong supporting layer can couple under the pressure with the medial surface of strake 3, the strake 3 that is located the top can contact the combined material layer that is located the below downwards, the strake 3 that is located the top extrudes down and bonds with the combined material layer that is located the below, make the combined material layer wrap up on strong supporting layer completely.
When the strakes 3 of upper and lower two sides all protrude, lower pressure ring body 702 moves in the same direction with last pressure ring body 701 at second drive group 6, until contact on the pressing plane, at the in-process of contact, the strakes 3 of upper and lower two sides turn over to the direction of strong supporting layer respectively, and two strakes 3 bond together, and the material that is more than is extruded and is pressed the ring body 702 and the last pressure ring body 701 outside down, convenient clearance.
In order to facilitate cutting of more edgings, the upper pressure ring body 701 and the lower pressure ring body 702 are both provided with the cutting tips 8, and when the upper pressure ring body 701 and the lower pressure ring body 702 are attached together, the ends of the two cutting tips 8 are attached together and cut the more edgings.
In order to prevent the pressing of the lower pressing ring body 702 and the upper pressing ring body 701 from being affected by the structure of the cutting tip 8, the cutting tips 8 on the lower pressing ring body 702 and the upper pressing ring body 701 are not on the same vertical line, and grooves for accommodating the opposite cutting tips 8 are formed in the lower pressing ring body 702 and the upper pressing ring body 701. (not shown in the figure)
In the present invention, it is important that when the upper press ring body 701 and the lower press ring body 702 extrude the edge strip, the edge of the cover body is fixed, so as to facilitate the demolding of the central mold 4.
Specifically, since the cutting tip 8 is a sharp corner, the inner side of the cutting tip 8 will extrude the edge strip, so that the edge strip is extruded into a special shape, and the special protrusion can be called as a mold release angle strip 9. The cutting tips 8 are all arranged on the outer walls of the upper pressure ring body 701 and the lower pressure ring body 702, so that corner gaps are arranged between the upper pressure ring body 701 and the lower pressure ring body 702, the edge strips are changed into the demolding corner strips 9 in the corner gaps, and the demolding corner strips 9 are arranged on the edge of the upper cover of the battery pack.
When the central mold 4 is demolded, the lower press ring body 702 and the upper press ring body 701 are closed together, and the demolding angle bar 9 is fixed in the corner gap, so that demolding of the central mold 4 is facilitated, and demolding between the upper press ring body 701 and the lower press ring body 702 is facilitated.
In the present invention, since three layers of materials need to be pressed and the materials are not fixedly connected to each other before press forming, they are easily displaced in the horizontal direction during pressing, and it is necessary to perform fixing operation by making full use of the pressing ring.
The second driving group 6 comprises a plurality of oil pumps 601 respectively arranged at the upper side and the lower side of the central die 4, the oil pumps 601 positioned at the lower side are connected with a lower pressing ring body 702 through a screw rod 602, and when the stacked strong supporting layer and the composite material layer are fed to a pressing plane, the lower pressing ring body 702 moves to the pressing plane under the driving of the screw rod 602 and fixes the edge strips on the composite material layer
Therefore, in order to solve the problem that the edge of the sandwich structure is not smooth in the preparation process, the invention adopts a combined mode of central die pressing and boundary die pressing, the central die pressing is firstly carried out, the metal material is coupled with the composite material under corresponding temperature and pressure, the boundary of the material is not pressed with a film, the boundary position is reserved, the air in the interface is favorably discharged, and the cover body bulge caused by the fact that the two subsequent materials are not attached is prevented.
After the center die pressing is finished, the cover body is basically formed at the moment, the edge of the cover body is subjected to boundary die pressing again, the reserved edge strips are coupled with the side face of the boundary of the metal material, and the upper layer and the lower layer of composite materials are bonded together, so that the boundary of the cover body is integrally formed, the cover body is not easy to crack, and subsequent trimming steps are reduced.
Through the composite metal combined type battery pack upper cover, the forming method of the composite metal combined type battery pack upper cover and the forming device of the composite metal combined type battery pack upper cover of the embodiment, the following beneficial effects are achieved:
1. the light weight of the battery pack is realized, the overall weight of the upper cover of the metal composite material metal combined battery pack is greatly reduced, and the problem that the energy loss of an automobile is increased due to overhigh overall weight of the metal battery pack is solved;
2. due to the existence of the epoxy resin-based glass fiber reinforced composite material, the fire resistance of the upper cover of the composite metal combined battery pack reaches 1700 ℃, so that the problem that the battery box is burnt when the battery is out of control due to heat is solved;
3. after the metal interlayer is added, the strength of the upper cover is improved, and the probability of deformation after collision is effectively reduced.
4. The mode of mixed use of metal and composite material is adopted, and the metal is thicker, so that the manufacturing cost is reduced, the thickness of the composite material is reduced, the number of layers of prepreg is reduced, the production flow is simplified, and the production efficiency is greatly improved.
5. The characteristics of metal and composite materials are combined, so that the overall strength, the fire resistance, the heat insulation and flame retardant performance, the insulating performance, the acid and alkali resistance and the like of the composite metal combined battery pack upper cover are improved;
6. the method adopts a step-by-step pressing mode, air possibly generated in the material interface during pressing is eliminated, the curing effect of the interface is improved, and the material is effectively prevented from layering and cracking in the later period;
7. the boundary pressing treatment is carried out on the interface of the composite material, so that the probability of deformation of the material due to overlong pressing time and overlarge pressing pressure during pressing is prevented, and the time of subsequent edge treatment is shortened.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (9)
1. The composite material metal combined type battery pack upper cover is characterized by comprising a strong support layer (1) and a composite material layer (2) which completely wraps the strong support layer (1) inside and forms a sandwich structure;
wherein:
the strong supporting layer (1) is made of a metal material;
the composite material layer (2) is an epoxy resin-based glass fiber reinforced composite material, and epoxy resin is located on the inner side of glass fibers.
2. The method for forming the upper cover of the composite metal combined battery pack according to claim 1, comprising the following steps of:
sequentially stacking the composite material layer, the strong support layer and the composite material layer to form a set single body, and preliminarily pressing the set single body in the vertical direction;
after the preliminary pressing is finished, integrally pressing and forming the collective monomer in a wrapping manner;
carrying out local interface coupling on the integrated pressing formed collection monomer;
selecting any starting point for the set monomer, and performing ring pressing outwards from the starting point according to a specified direction until the composite material layer is completely attached to the surface of the strong support layer;
and performing interface coupling on the collection monomer again, and performing secondary overall wrapping type annular pressing on the collection monomer after the interface coupling is completed until the collection monomer is cooled and formed.
3. The method for forming the upper cover of the composite metal combined battery pack according to claim 2, wherein in the integrated press forming process, the method comprises the following specific steps:
in the vertical direction, performing central mould pressing on the superposed position of the strong support layer and the two composite material layers to form a cavity;
in the central die pressing process, the edge of the die cavity is subjected to boundary die pressing in the vertical direction, and the boundary of the two composite material layers has the tendency of being transversely close to the peripheral side of the strong support layer in the vertical extrusion process;
and stopping the central molding and the boundary molding simultaneously to obtain the battery pack upper cover.
4. The method as claimed in claim 3, wherein an equidistant edge strip is left between the boundary of the strong support layer and the boundary of the composite material layer during stacking;
in the boundary mould pressing process, the mould at the periphery of the cavity drives the edge strip to be turned over towards the advancing direction of the mould, and the edge strip moves and is attached to the periphery of the strong supporting layer under the extrusion of the mould until the interface is coupled.
5. A molding device for a method of molding a cover of a composite metal assembled battery pack according to any one of claims 2 to 4, comprising:
the central die (4) is provided with a pressing plane, the central die (4) presses the strong supporting layer and the composite material layer which are stacked on the pressing plane through a first driving group (5), the composite material layers on the upper side and the lower side are continuously heated and pressed in a cavity of the central die (4) until contact interfaces of two different materials are coupled, and at least one edge strip arranged on the composite material layer is convexly arranged on the outer side of the central die (4);
limit clamping ring subassembly (7), slide through second drive group (6) and set up week side of center mould (4), the inner wall laminating of limit clamping ring subassembly (7) is in on the outer wall of center mould (4), the combined material layer pressurized in-process, two upper and lower rings of limit clamping ring subassembly (7) are to the bulge the strake removes, makes the strake to the direction bending at strong supporting layer place, and receive the inside extrusion force of ring body, the strake under the extrusion with the side boundary coupling of strong supporting layer.
6. The forming device of the composite metal combined battery pack upper cover according to claim 5, wherein the edge pressing ring assembly (7) comprises an upper pressing ring body (701) sliding on the lower end of the central mold (4) through a second driving set (6) and a lower pressing ring body (702) sliding on the upper end of the central mold (4), and both the upper pressing ring body (701) and the lower pressing ring body (702) can move to the other end of the central mold (4) through the pressing plane;
the upper pressing ring body (701) and the lower pressing ring body (702) can be attached to the outside of the pressing plane and absorb the heat overflowing from the central mold (4), and the pressing action of the central mold (4) has time difference with the pressing actions of the upper pressing ring body (701) and the lower pressing ring body (702).
7. The forming device of the upper cover of the composite metal combined battery pack according to claim 6, wherein the upper press ring body (701) and the lower press ring body (702) are both provided with the cutting tips (8), and when the upper press ring body (701) and the lower press ring body (702) are attached together, the ends of the two cutting tips (8) are attached together and cut more than one edge strip.
8. The device for forming the upper cover of the composite metal combined battery pack according to claim 7, wherein the cutting points (8) are arranged on the outer walls of the upper pressure ring body (701) and the lower pressure ring body (702), so that a corner gap is arranged between the upper pressure ring body (701) and the lower pressure ring body (702), the edge strip is formed into a demolding angle strip (9) in the corner gap, and the demolding angle strip (9) is arranged at the edge of the upper cover of the battery pack.
9. The forming device of the upper cover of the composite metal combined battery pack according to claim 7, wherein the second driving set (6) comprises a plurality of oil pumps (601) respectively arranged at the upper side and the lower side of the central mold (4), the oil pump (601) positioned at the lower side is connected with the lower pressing ring body (702) through a screw rod (602), and when the stacked strong supporting layer and the composite material layer are loaded to the pressing plane, the ring body of the lower pressing ring body (702) is driven by the screw rod (602) to move to the pressing plane and fix the edge strips on the composite material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211428472.8A CN115882154A (en) | 2022-11-15 | 2022-11-15 | Composite metal combined battery pack upper cover and forming method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211428472.8A CN115882154A (en) | 2022-11-15 | 2022-11-15 | Composite metal combined battery pack upper cover and forming method and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115882154A true CN115882154A (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211428472.8A Pending CN115882154A (en) | 2022-11-15 | 2022-11-15 | Composite metal combined battery pack upper cover and forming method and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115882154A (en) |
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2022
- 2022-11-15 CN CN202211428472.8A patent/CN115882154A/en active Pending
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