CN112223783A - Forming die and preparation method of lower frame of composite material battery pack - Google Patents

Forming die and preparation method of lower frame of composite material battery pack Download PDF

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Publication number
CN112223783A
CN112223783A CN202011004743.8A CN202011004743A CN112223783A CN 112223783 A CN112223783 A CN 112223783A CN 202011004743 A CN202011004743 A CN 202011004743A CN 112223783 A CN112223783 A CN 112223783A
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CN
China
Prior art keywords
plate
frame
die
battery pack
composite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011004743.8A
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Chinese (zh)
Inventor
赫晓东
徐忠海
蔡朝灿
王荣国
刘文博
杨帆
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Zhaoqing Haite Composite Technology Research Institute
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Zhaoqing Haite Composite Technology Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhaoqing Haite Composite Technology Research Institute filed Critical Zhaoqing Haite Composite Technology Research Institute
Priority to CN202011004743.8A priority Critical patent/CN112223783A/en
Publication of CN112223783A publication Critical patent/CN112223783A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/30Shaping 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
    • B29C70/34Shaping 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
    • B29C70/345Shaping 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 using matched moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor

Abstract

The invention provides a forming die of a composite material battery pack lower frame and a preparation method, belongs to the field of battery pack forming, and aims to solve the problems of long manufacturing period and low production efficiency of the existing composite material battery pack lower frame; the peripheral combined frame is arranged on the upper surface of the bottom plate along the edge of the bottom plate and fixedly connected to the bottom plate through a bolt and nut mechanism, the upper pressing die is arranged at the top of the peripheral combined frame and can slide on the peripheral combined frame along a guide part at the top of the peripheral combined frame.

Description

Forming die and preparation method of lower frame of composite material battery pack
Technical Field
The invention belongs to the field of battery pack forming, and particularly relates to a forming die and a preparation method of a lower frame of a composite battery pack.
Background
In recent years, new energy vehicles have been developed very rapidly, wherein the development of electric vehicles is particularly concerned, the electric drive itself belongs to clean renewable energy, and the electric drive replaces the existing oil-gas-powered vehicles, so that the nonrenewable consumption of oil, natural gas and the like is greatly saved, the exhaust emission of road vehicles is reduced, the atmospheric pollution is reduced, and the environmental protection is well protected, but the technology of the electric vehicles is not mature, many details need to be further developed, wherein in order to increase the protection and safety of the power source of the electric vehicles, many manufacturers try to manufacture battery packs of the electric vehicles by using composite materials, but the existing battery packs are generally divided into a lower frame and an upper cover, the lower frame is mainly used for bearing a plurality of lithium batteries, and most of the lower frames are arranged on the chassis of the vehicles, and have higher structural requirements, the manufacturing process is time-consuming and labor-consuming, so that the development of a forming die and a preparation method of the composite material battery pack lower frame for improving the manufacturing efficiency of the battery pack is in line with the actual requirement.
Disclosure of Invention
The invention provides a forming die and a preparation method of a composite material battery pack lower frame, aiming at solving the problems of long manufacturing period and low production efficiency of the existing composite material battery pack lower frame;
a forming die for a lower frame of a composite material battery pack comprises an upper pressing die, a peripheral combined frame and a bottom plate;
the peripheral combined frame is arranged on the upper surface of the bottom plate along the edge of the bottom plate and is fixedly connected to the bottom plate through a bolt-nut mechanism, the upper pressing die is arranged at the top of the peripheral combined frame, and the upper pressing die can slide on the peripheral combined frame along a guide part at the top of the peripheral combined frame;
furthermore, the upper pressing die comprises a bearing plate, a top connecting plate and a pressing module, the bearing plate, the top connecting plate and the pressing module are sequentially and coaxially arranged from top to bottom, the upper surface of the top connecting plate is fixedly connected with the lower surface of the bearing plate, the upper surface of the pressing module is fixedly connected with the lower surface of the top connecting plate, a first groove is machined in the wide edge of the lower surface of the pressing module, and a second groove is machined in the central line of the lower surface of the pressing module along the length direction of the pressing module;
further, the end face of the first groove is one of a rectangle and a sector;
further, the end face of the second groove is one of a rectangle and a semicircle;
furthermore, the peripheral combined frame comprises a plurality of side frames which are sequentially connected end to form the combined frame, and the bottom of each side frame is fixedly connected to the bottom plate through a bolt-nut mechanism;
furthermore, the frame comprises a C-shaped plate, a vertical plate, a bottom connecting plate and a plurality of guide columns, the C-shaped plate, the vertical plate and the bottom connecting plate are sequentially arranged from top to bottom, the top of the vertical plate is arranged close to the opening of the C-shaped plate, the upper surface of the vertical plate is fixedly connected with the lower surface of the C-shaped plate, the lower surface of the vertical plate is fixedly connected with the upper surface of the bottom connecting plate, the opening side of the C-shaped plate, one side of the vertical plate and one side of the bottom connecting plate are all located on the same vertical surface, the plurality of guide columns are arranged on the upper surface of the C-shaped plate at equal intervals along the length direction of the C-shaped plate, and one end of;
furthermore, a plurality of guide holes are uniformly processed at the edge of the upper surface of the bearing plate, and each guide hole is arranged corresponding to one guide column;
a preparation method of a composite material battery pack lower frame is realized by the following steps:
firstly, arranging frames in a peripheral combined frame on a bottom plate one by one according to the outline of a battery pack to be formed, vertically processing a plurality of connecting holes on a bottom connecting plate in the frames, processing a connecting blind hole on the bottom plate corresponding to each connecting hole, arranging a bolt in each group of connecting holes and connecting blind holes, extending one end of each bolt out of the bottom connecting plate, sleeving a nut on one end of each bolt extending out of the bottom connecting plate, and connecting the nut and the bolt in a threaded fit manner;
fixing the bottom plate, paving carbon fiber composite prepreg on the bottom plate layer by layer, and paving 12-20 layers according to different structural sizes of the battery pack to be molded;
step three: arranging an upper pressing die on a peripheral combined frame, wherein each guide post on the peripheral combined frame is arranged corresponding to one guide hole in the upper pressing die, the upper pressing die can move along the extension direction of the guide post without obstruction, and a pressing die block is accurately arranged in the peripheral combined frame;
step five: performing die assembly, applying force to the top of the upper pressing die through a hydraulic cylinder to enable the upper pressing die to do linear motion downwards, simultaneously pressing the resin composite material between the upper pressing die and the bottom plate, and curing for 9 hours after the die assembly gap between the upper pressing die and the bottom plate is less than 0.1;
step six: demolding after curing and forming, enabling the telescopic rod of the hydraulic cylinder to be far away from the upper surface of the upper pressing die, lifting the upper pressing die along the edge of the upper pressing die, and separating the upper pressing die from the peripheral combined frame;
step seven: cleaning the edge of the lower frame body of the formed battery pack to enable the size of the lower frame body to meet the size requirement of the battery pack;
step eight: and loosening the nuts on the middle frame of the peripheral combined frame one by one, separating the middle frame of the peripheral combined frame from the bottom plate one by one, and taking down the formed lower frame of the battery pack from the bottom plate.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a forming die and a preparation method of a composite material battery pack lower frame, wherein the composite material battery pack lower frame is formed at one step through the forming die, compared with the existing manufacturing mode that the composite material is integrally cured firstly and then is cut step by step, and finally all parts are spliced, the integral manufacturing process is simplified, the manufacturing efficiency is improved, the use of the composite material is saved more, the utilization rate of the composite material is improved, compared with the battery pack lower frame manufactured through the splicing mode, the battery pack lower frame manufactured through the integral forming method has higher density, stronger shock resistance and impact resistance, the protection on batteries in the battery pack and the safety when the batteries are used are correspondingly enhanced.
Drawings
FIG. 1 is a cross-sectional view of a molding die of the present invention during die assembly;
FIG. 2 is a front view of the mold of the present invention when closed;
FIG. 3 is a bottom view of the upper die of the present invention;
FIG. 4 is a front view of the upper die of the present invention;
FIG. 5 is a front view of the bezel of the present invention;
FIG. 6 is a side view of the bezel of the present invention;
fig. 7 is a schematic structural view of a lower frame of a battery pack according to the present invention.
The drawing comprises an upper pressing die 1, a bearing plate 11, a top connecting plate 12, a pressing module 13, a groove 14I, a groove 15 II, a peripheral combined frame 2, a C-shaped plate 21, a vertical plate 22, a bottom connecting plate 23, a guide post 24 and a bottom plate 3
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 7, and provides a molding die for a lower frame of a composite material battery pack, the die including an upper molding die 1, a peripheral combining frame 2, and a base plate 3;
the peripheral combined frame 2 is arranged on the upper surface of the bottom plate 3 along the edge of the bottom plate 3, the peripheral combined frame 2 is fixedly connected on the bottom plate 3 through a bolt-nut mechanism, the upper pressing die 1 is arranged at the top of the peripheral combined frame 2, and the upper pressing die 1 can slide on the peripheral combined frame 2 along a guide part at the top of the peripheral combined frame 2.
The invention provides a forming die and a preparation method of a composite material battery pack lower frame, wherein the composite material battery pack lower frame is formed at one step through the forming die, compared with the existing manufacturing mode that the composite material is integrally cured firstly and then is cut step by step, and finally all parts are spliced, the integral manufacturing process is simplified, the manufacturing efficiency is improved, the use of the composite material is saved more, the utilization rate of the composite material is improved, compared with the battery pack lower frame manufactured through the splicing mode, the battery pack lower frame manufactured through the integral forming method has higher density, stronger shock resistance and impact resistance, the protection on batteries in the battery pack and the safety when the batteries are used are correspondingly enhanced.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 7, and the present embodiment further defines the upper die 1 according to the first embodiment, in the present embodiment, the upper die 1 includes a pressure bearing plate 11, a top connecting plate 12 and a die block 13, the pressure bearing plate 11, the top connecting plate 12 and the die block 13 are coaxially disposed in sequence from top to bottom, an upper surface of the top connecting plate 12 is fixedly connected with a lower surface of the pressure bearing plate 11, an upper surface of the die block 13 is fixedly connected with a lower surface of the top connecting plate 12, a first groove 14 is processed at a wide edge of a lower surface of the die block 13, and a second groove 15 is processed at a center line of the lower surface of the die block 13 along a length direction of the die block 13. Other components and connection modes are the same as those of the first embodiment.
In this embodiment, a piston rod of the hydraulic cylinder directly acts on the bearing plate 11 to push the upper pressing die 1 to perform die assembly, the unilateral size difference between the pressing die block 13 and the top connecting plate 12 is the thickness of the side wall of the battery pack to be formed, and the first groove 14 and the second groove 15 at the lower part of the pressing die block 13 are beneficial to forming reinforcing ribs at the bottom of the lower frame of the formed battery pack, so that the compressive shock resistance of the lower frame of the battery pack is guaranteed.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1 to 7, and the present embodiment further defines the first groove 14 described in the second embodiment, and in the present embodiment, an end surface of the first groove 14 is one of a rectangle and a sector. The other components and the connection mode are the same as those of the second embodiment.
In this embodiment, as shown in fig. 7, the reinforcing rib formed by the first groove 14 is close to the wide side of the battery pack lower frame, and both ends of the reinforcing rib are in contact with the long side of the battery pack lower frame, so when the end surface of the first groove 14 is in the shape of a sector, the central angle of the sector is preferably 90 °.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 7, and the present embodiment further defines the No. two groove 15 described in the third embodiment, and in the present embodiment, an end surface of the No. two groove 15 is one of a rectangle and a semicircle. Other components and connection modes are the same as those of the third embodiment.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 7, and is further limited to the peripheral combination frame 2 according to the fourth embodiment, in the present embodiment, the peripheral combination frame 2 includes a plurality of side frames, the side frames are sequentially connected end to form a combination frame, and the bottom of each side frame is fixedly connected to the bottom plate 3 through a bolt-nut mechanism. The other components and the connection mode are the same as those of the fourth embodiment.
In the present embodiment, the frame composition structure of the peripheral combination frame 2 is the same, but the length can be selected according to the outline of the lower frame of different battery packs.
The sixth specific implementation mode: the embodiment is described with reference to fig. 1 to 7, and is further defined by referring to the frame of the fifth embodiment, in the embodiment, the frame includes a C-shaped plate 21, a vertical plate 22, a bottom connecting plate 23, and a plurality of guide posts 24, the C-shaped plate 21, the vertical plate 22, and the bottom connecting plate 23 are sequentially disposed from top to bottom, the top of the vertical plate 22 is disposed near an opening of the C-shaped plate 21, an upper surface of the vertical plate 22 is fixedly connected to a lower surface of the C-shaped plate 21, a lower surface of the vertical plate 22 is fixedly connected to an upper surface of the bottom connecting plate 23, an opening side of the C-shaped plate 21, one side of the vertical plate 22, and one side of the bottom connecting plate 23 are located on the same vertical plane, the plurality of guide posts 24 are equidistantly disposed on the upper surface of the C-shaped plate 21 along a length direction of the C-shaped plate 21, and one. The other components and the connection mode are the same as the fifth embodiment mode.
In this embodiment, the C-shaped plate 21 is used to generate a connection portion at the edge of the lower frame of the battery pack, so that the lower frame of the battery pack can be conveniently connected with the upper frame of the battery pack.
The seventh embodiment: referring to fig. 1 to 7, this embodiment is described, and further defines the pressure bearing plate 11 according to the sixth embodiment, in this embodiment, a plurality of guide holes are uniformly processed at the edge of the upper surface of the pressure bearing plate 11, and each guide hole is disposed corresponding to one guide column 24. Other components and connection modes are the same as those of the sixth embodiment.
In this embodiment, the guide portion is composed of the plurality of guide posts 24, and is matched with the plurality of guide holes on the bearing plate 11, so that the upper pressing die 1 can move along a straight line in the pressing process, the upper pressing die 1 is prevented from inclining during pressing, and the rejection rate is increased.
The specific implementation mode is eight: the present embodiment is described with reference to fig. 1 to 7, and provides a method for manufacturing a composite material battery pack lower frame, including: the method is realized by the following steps:
firstly, arranging frames in a peripheral combined frame 2 on a bottom plate 3 one by one according to the outline of a battery pack to be formed, vertically processing a plurality of connecting holes on a bottom connecting plate 23 in the frames, processing a connecting blind hole on the bottom plate 3 corresponding to each connecting hole, arranging a bolt in each group of connecting holes and connecting blind holes, extending one end of each bolt out of the bottom connecting plate 23, sleeving a nut on the end of each bolt extending out of the bottom connecting plate 23, and connecting the nut and the bolt in a threaded fit manner;
fixing the bottom plate 3, paving carbon fiber composite prepreg on the bottom plate 3 layer by layer, and paving 12-20 layers according to different structural sizes of the battery pack to be molded;
step three: arranging an upper pressing die 1 on a peripheral combined frame 2, wherein each guide post 24 on the peripheral combined frame 2 is arranged corresponding to one guide hole in the upper pressing die 1, and ensuring that the upper pressing die 1 can move along the extending direction of the guide post 24 without obstruction, and meanwhile, a pressing module 13 is accurately arranged in the peripheral combined frame 2;
step five: performing die assembly, applying force to the top of the upper die 1 through a hydraulic cylinder, enabling the upper die 1 to do linear motion downwards, simultaneously pressing the resin composite material between the upper die 1 and the bottom plate 3, and curing for 9 hours after a die assembly gap between the upper die 1 and the bottom plate 3 is less than 0.1;
step six: demolding is carried out after curing and forming, so that the telescopic rod of the hydraulic cylinder is far away from the upper surface of the upper pressing die 1, the upper pressing die 1 is lifted along the edge of the upper pressing die 1, and the upper pressing die 1 is separated from the peripheral combined frame 2;
step seven: cleaning the edge of the lower frame body of the formed battery pack to enable the size of the lower frame body to meet the size requirement of the battery pack;
step eight: and (3) loosening the nuts on the middle frames of the peripheral combined frame 2 one by one, separating the middle frames of the peripheral combined frame 2 from the bottom plate 3 one by one, and taking down the formed lower frame of the battery pack from the bottom plate 3.
In this embodiment, fashioned battery package upper ledge top edge also can set up connecting portion, is convenient for bond fixedly with the battery package lower ledge, if adopt bolt nut mechanism to connect battery package lower ledge and battery package upper ledge, then still need punch a hole respectively at the connecting portion of battery package lower ledge and the connecting portion of battery package upper ledge, and the punching a hole on the battery package lower ledge and the punching a hole on the battery package upper ledge want the one-to-one, guarantee the accuracy of connecting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents, and improvements that are within the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. The utility model provides a forming die of combined material battery package lower frame which characterized in that: the die comprises an upper pressing die (1), a peripheral combined frame (2) and a bottom plate (3);
the peripheral combined frame (2) is arranged on the upper surface of the bottom plate (3) along the edge of the bottom plate (3), the peripheral combined frame (2) is fixedly connected to the bottom plate (3) through a bolt-nut mechanism, the upper pressing die (1) is arranged at the top of the peripheral combined frame (2), and the upper pressing die (1) can slide on the peripheral combined frame (2) along a guide part at the top of the peripheral combined frame (2).
2. The mold for molding the lower frame of the composite battery pack according to claim 1, wherein: go up moulding-die (1) including bearing plate (11), top connecting plate (12) and moulding-die piece (13), bearing plate (11), top connecting plate (12) and moulding-die piece (13) from top to bottom coaxial setting in proper order, the upper surface of top connecting plate (12) is connected with the lower fixed surface of bearing plate (11), the upper surface of moulding-die piece (13) is connected with the lower fixed surface of top connecting plate (12), the broadside department processing of moulding-die piece (13) lower surface has recess (14) No. one, moulding-die piece (13) lower surface is processed No. two recess (15) along moulding-die piece (13) length direction's central line department.
3. The mold for molding the lower frame of the composite battery pack according to claim 2, wherein: the end face of the first groove (14) is one of rectangular and fan-shaped.
4. The mold for molding the lower frame of the composite battery pack according to claim 3, wherein: the end face of the second groove (15) is one of rectangular and semicircular.
5. The mold for molding the lower frame of the composite battery pack according to claim 4, wherein: the peripheral combined frame (2) comprises a plurality of frames which are sequentially connected end to form the combined frame, and the bottom of each frame is fixedly connected to the bottom plate (3) through a bolt-nut mechanism.
6. The mold for molding the lower frame of the composite battery pack according to claim 5, wherein: the frame includes C shaped plate (21), riser (22), bottom connecting plate (23) and a plurality of guide post (24), C shaped plate (21), riser (22) and bottom connecting plate (23) set gradually from top to bottom, the top of riser (22) is close to C shaped plate (21) opening part setting, and the upper surface of riser (22) and the lower fixed surface of C shaped plate (21) are connected, the lower surface of riser (22) and the upper fixed surface of bottom connecting plate (23) are connected, and the opening side of C shaped plate (21), one side of riser (22) and one side of bottom connecting plate (23) all are located same vertical face, the length direction equidistance setting of C shaped plate (21) is followed in a plurality of guide post (24) on the upper surface of C shaped plate (21), and the upper fixed surface of the one end of every guide post (24) and C shaped plate (21) is connected.
7. The mold for molding the lower frame of the composite battery pack according to claim 6, wherein: a plurality of guide holes are uniformly processed at the edge of the upper surface of the pressure bearing plate (11), and each guide hole is arranged corresponding to one guide column (24).
8. The method for preparing the composite material battery pack lower frame by using the forming die of the composite material battery pack lower frame as claimed in any one of claims 1 to 7 is characterized in that: the method is realized by the following steps:
firstly, frames in a peripheral combined frame (2) are arranged on a bottom plate (3) one by one according to the outline of a battery pack to be formed, a plurality of connecting holes are vertically processed on a bottom connecting plate (23) in the frames, a connecting blind hole is processed on the bottom plate (3) corresponding to each connecting hole, a bolt is arranged in each group of connecting holes and each connecting blind hole, one end of each bolt extends out of the bottom connecting plate (23), a nut is sleeved on one end of each bolt extending out of the bottom connecting plate (23), and the nut is in threaded fit connection with the bolt;
fixing the bottom plate (3), laying carbon fiber composite prepreg on the bottom plate (3) layer by layer, and laying 12-20 layers according to different structural sizes of the battery pack to be molded;
step three: arranging an upper pressing die (1) on a peripheral combined frame (2), wherein each guide post (24) on the peripheral combined frame (2) is arranged corresponding to one guide hole in the upper pressing die (1), the upper pressing die (1) can move along the extending direction of the guide post (24) without obstruction, and a pressing module (13) is accurately arranged in the peripheral combined frame (2);
step five: performing die assembly, applying force to the top of the upper pressing die (1) through a hydraulic cylinder, enabling the upper pressing die (1) to do linear motion downwards, simultaneously pressing the resin composite material between the upper pressing die (1) and the bottom plate (3), and curing for 9 hours after a die assembly gap between the upper pressing die (1) and the bottom plate (3) is less than 0.1;
step six: demolding is carried out after curing and forming, the telescopic rod of the hydraulic cylinder is far away from the upper surface of the upper pressing die (1), the upper pressing die (1) is lifted along the edge of the upper pressing die (1), and the upper pressing die (1) is separated from the peripheral combined frame (2);
step seven: cleaning the edge of the lower frame body of the formed battery pack to enable the size of the lower frame body to meet the size requirement of the battery pack;
step eight: and (3) loosening the nuts on the middle frames of the peripheral combined frame (2) one by one, separating the middle frames of the peripheral combined frame (2) from the bottom plate (3) one by one, and taking down the molded lower frame of the battery pack from the bottom plate (3).
CN202011004743.8A 2020-09-22 2020-09-22 Forming die and preparation method of lower frame of composite material battery pack Pending CN112223783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011004743.8A CN112223783A (en) 2020-09-22 2020-09-22 Forming die and preparation method of lower frame of composite material battery pack

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Application Number Priority Date Filing Date Title
CN202011004743.8A CN112223783A (en) 2020-09-22 2020-09-22 Forming die and preparation method of lower frame of composite material battery pack

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Publication Number Publication Date
CN112223783A true CN112223783A (en) 2021-01-15

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