CN105552690A - Negative ground bolt installation method for vehicle body in white and vehicle - Google Patents
Negative ground bolt installation method for vehicle body in white and vehicle Download PDFInfo
- Publication number
- CN105552690A CN105552690A CN201510934221.0A CN201510934221A CN105552690A CN 105552690 A CN105552690 A CN 105552690A CN 201510934221 A CN201510934221 A CN 201510934221A CN 105552690 A CN105552690 A CN 105552690A
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- Prior art keywords
- bolt
- bonding
- vehicle body
- white
- nut
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/26—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for engaging or disengaging the two parts of a coupling device
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The invention discloses a negative ground bolt installation method for a vehicle body in white and a vehicle. The negative ground bolt installation method for the vehicle body in white comprises the following steps of 1, removing an oil film and impurities on the surface to be welded for installing a negative ground bolt on a metal plate of the vehicle body in white; 2, pre-installing a negative ground bolt assembly; 3, stud-welding an arc striking region of a bolt head in the pre-installed negative ground bolt assembly onto the surface to be welded in the step 1 so as to form surface contact between the bolt head and the metal plate, wherein a rod part of the bolt is arranged facing the outer side of the vehicle body in white; and 4, taking a nut out of the bolt, separately sleeving the bolt with a negative ground terminal and the nut from the tail end of the bolt according to a sequence, and screwing the nut until the surface of the negative ground terminal is in close contact with a lap joint plane of the bolt head so as to form surface contact between the surface of the negative ground terminal and the lap joint plane of the bolt head. By the negative ground bolt installation method, the conductivity between the negative ground terminal and the vehicle metal plate is favorably ensured.
Description
Technical field
The present invention relates to technical field of vehicle, particularly relate to a kind of bonding bolt installation method for vehicle body in white and vehicle.
Background technology
At present, the electronic apparatus system on vehicle adopts one wire system, and usually adopt the mode of minus earth, namely the negative pole of storage battery connects with vehicle body sheet metal (vehicle frame), and the negative pole of electronic apparatus and vehicle body sheet metal overlap and form loop.Bonding terminal one end of present wire harness is generally circulus, is connected in corresponding to bonding terminal and vehicle body bonding hole, and is fixed by nut at bolt tail end by standard bolt.That is, existing bonding terminal and vehicle body sheet metal are that the effective overlap joint area so between bonding terminal and vehicle body sheet metal directly will can affect conductivity and the reliability of bonding terminal by fitting tightly and realizing effective electrical connection between face and face.But existing bonding bolt by traditional projection welding quality influence, cannot ensure closely cooperating of mounting plane on vehicle body sheet metal and bonding terminal, thus it is too small to cause conductive effective to overlap area, poor electric conductivity, adds the risk of burning car.
Therefore, wish a kind of technical scheme to overcome or at least alleviate at least one above-mentioned defect of prior art.
Summary of the invention
A kind of bonding bolt installation method for vehicle body in white is the object of the present invention is to provide to overcome or at least alleviate at least one above-mentioned defect of the prior art.
For achieving the above object, the invention provides a kind of bonding bolt assembly installation method for vehicle body in white, described bonding bolt assembly comprises bolt and nut, the described bonding bolt assembly installation method for vehicle body in white comprises the following steps: step 1, for installing oil film and the impurity on the surface to be welded of bonding bolt on the panel beating of removing vehicle body in white; Step 2, pre-installs described bonding bolt assembly; Step 3, the striking region of the described bolt head in the described bonding bolt assembly be pre-installed is planted the surface described to be welded be soldered in described step 1 to contact with described panel beating forming surface to make the head of described bolt, and the bar portion of described bolt is towards the arranged outside of described vehicle body in white; Step 4, described nut is taken off from described bolt, according to sequencing, bonding terminal and described nut are inserted in from the afterbody of described bolt respectively, and described nut is screwed until the surface of described bonding terminal fits to the overlap joint plane of described bolt head, contact with the overlap joint plane forming surface of described bolt head to make the surface of described bonding terminal.
Further, in described step 3, determine to plant weldering electric current according to the thickness of described panel beating.
Further, the thickness range of described panel beating is 0.8mm ~ 4mm.
Further, the material of described bolt and described nut is ML45 cold-forging steel.
Further, the surface of described bolt arranges the coating layer of zinc-nickel alloy, and the neutral salt spray test time of this coating layer is greater than 800 hours.
Further, the surface of described nut arranges zinc-plated coating layer, and the salt mist test time of this coating layer is at least 240 hours.
The present invention also provides a kind of vehicle, described vehicle comprises vehicle body in white panel beating, bonding bolt assembly and bonding terminal, described bonding bolt assembly comprises bolt and nut, the striking region of described bolt head is planted and to be welded and the panel beating fitting to described vehicle body in white contacts with described panel beating forming surface to make the head of described bolt, the bar portion of described bolt is towards the arranged outside of vehicle body, described bonding terminal is located between the head of described bolt and described nut, and the overlap joint plane that the surface of described bonding terminal fits to described bolt head contacts with the overlap joint plane forming surface of described bolt head to make the surface of described bonding terminal.
Further, the overlap joint plane orthogonal of described bolt head is arranged in the bar portion of described bolt.
Further, the thickness range of described panel beating is 0.8mm ~ 4mm.
Further, the material of described bolt and described nut is ML45 cold-forging steel, the surface of described bolt arranges the coating layer of zinc-nickel alloy, the neutral salt spray test time of the coating layer of this zinc-nickel alloy is greater than 800 hours, the surface of described nut arranges zinc-plated coating layer, and the salt mist test time of this zinc-plated coating layer is at least 240 hours.
Apply technical scheme provided by the present invention, by installation method provided by the present invention, bolt head can be made to contact with the panel beating forming surface of vehicle body in white on the one hand, electrical contact good between the panel beating of bolt head and vehicle body in white can be ensured like this, all the time the conductivity of the head of bolt is ensured, on the other hand, the surface of bonding terminal can be made to contact with the overlap joint plane forming surface of bolt head, so also can ensure electrical contact good between bonding terminal and bolt head, in this case, as long as ensure to form face contact closely between bonding terminal and bolt head, so the two face contact portion formed is then the effective overlap joint area between bonding terminal and vehicle body sheet metal, and then be conducive to the conductivity ensureing bonding terminal and vehicle body sheet metal.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of bonding bolt installation method one preferred implementation for vehicle body in white provided by the present invention;
Fig. 2 is the structural representation for bolt one preferred implementation in the bonding bolt of vehicle body in white provided by the present invention;
Fig. 3 is the end view of Fig. 2;
Fig. 4 structural representation for nut one preferred implementation in the bonding bolt of vehicle body in white provided by the present invention;
Fig. 5 is the end view of Fig. 4.
Reference numeral:
| 1 | Bolt | 2 | Nut |
| 11 | The head of bolt | 12 | The bar portion of bolt |
| 11a | The overlap joint plane of bolt head | A1 | Nugget diameter |
| A2 | The length of bolt | A3 | The nominal diameter of screw thread |
| B1 | Nut external diameter | B2 | Nut length |
| B3 | Nut end face external diameter | B4 | Wrench opening degree |
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
As shown in Figure 1, present embodiment provide in the bonding bolt assembly installation method of vehicle body in white, described bonding bolt assembly comprises bolt and nut, and this installation method comprises the following steps:
Step 1, removes oil film and impurity: for installing the oil film on the surface to be welded of bonding bolt on the panel beating removing vehicle body in white, ensures that surface is greater than the essentially smooth metal surface of 35mm for diameter.Carry out anticorrosion because general factory floor all can be coated with one deck oil film on the panel beating of vehicle body in white, to prevent panel beating corrosion before processing.Impurity is such as dust etc.
Step 2, prepackage bolt assembly: pre-install described bonding bolt assembly.Because screw bolt and nut needs to go in advance to carry out fastening before being welded, make between screw bolt and nut very close to each other, beneficial effect major embodiment very close to each other between screw bolt and nut both ways, on the one hand, the section that can play protection bolt can not be sprayed onto paint, thus ensures the conductivity of the section of bolt; On the other hand, can guarantee that bolt assembly is being planted in weldering arc process, bolt can not produce electric arc because of gap, avoids screw bolt and nut clinkering.In present embodiment, described bonding bolt assembly can adopt the bonding bolt of M6 model to combine, the Tightening moment of its prepackage is 4 ~ 7Nm, and described bonding bolt assembly can also adopt the bonding bolt of M8 model to combine, and the Tightening moment of its prepackage is 6 ~ 9Nm.
Step 3, plant weldering bolt assembly: the surface described to be welded be soldered in described step 1 is planted in the striking region of the described bolt head in the described bonding bolt assembly be pre-installed, contact with described panel beating forming surface to make the head of described bolt, and the bar portion of described bolt is towards the arranged outside of described vehicle body in white, and ensure that bolt shank is vertical with panel beating." outside ", for entire vehicle structure, the space outside vehicle all can be called " outward ".
Step 4, bonding terminal is installed: take off described nut from described bolt, according to sequencing, bonding terminal and described nut are inserted in from the afterbody of described bolt respectively, and described nut is screwed until the surface of described bonding terminal fits to the overlap joint plane of described bolt head, contact with the overlap joint plane forming surface of described bolt head to make the surface of described bonding terminal.
By above-mentioned installation method, bolt head can be made to contact with the panel beating forming surface of vehicle body in white on the one hand, electrical contact good between the panel beating of bolt head and vehicle body in white can be ensured like this, all the time the conductivity of the head of bolt is ensured, on the other hand, the surface of bonding terminal can also be made to contact with the overlap joint plane forming surface of bolt head, so also can ensure electrical contact good between bonding terminal and bolt head, in this case, as long as ensure to form face contact closely between bonding terminal and bolt head, so the two face contact portion formed is then the effective overlap joint area between bonding terminal and vehicle body sheet metal, and then be conducive to the conductivity ensureing bonding terminal and vehicle body sheet metal.
In said method, the panel beating of vehicle body in white has solderability, and thickness is too thin, easy burn-through, and thickness is too thick, can increase tare, is unfavorable for reducing cost, and therefore, the thickness range of the panel beating of vehicle body in white elects 0.8mm ~ 4mm as.
In described step 3, determine to plant weldering electric current according to the thickness of the panel beating of vehicle body in white, such as: the weldering electric current of planting of the panel beating of the vehicle body in white of 1.0mm thickness is roughly about 500A, the weldering electric current of planting of the panel beating of the vehicle body in white of 4.0mm thickness is roughly about 800A, thus overlap can be controlled and ensure bonding reliability and soldering reliability, can also guarantee that bolt assembly is being planted in weldering arc process, bolt can not produce electric arc because of gap, avoids screw bolt and nut planting in weldering process clinkering together.
The material of described bolt and described nut is ML45 cold-forging steel, and ML45 cold-forging steel has excellent mechanical performance.Because screw bolt and nut in use may be subject to the impact of shearing force, therefore common iron may rupture, and ML35 cold-forging steel can reach 8.8 grades of mechanical performances, thus guarantees screw bolt and nut not easy fracture.
Preferably, the surface of described bolt arranges the coating layer of zinc-nickel alloy, and the coating layer of zinc-nickel alloy has the reliability that good conductivity can guarantee bonding.In addition, the neutral salt spray test time of the coating layer of zinc-nickel alloy is greater than 800 hours, can guarantee that bolt can not corrode thus.Be prior art in the technique of the coating layer of the surface treatment zinc-nickel alloy of bolt, do not repeat them here.
Preferably, the surface of described nut arranges zinc-plated coating layer, and the salt mist test time of zinc-plated coating layer is at least 240 hours, thus nut is enough to meet fastening and demand that is simple protection against corrosion effect.Be prior art in the technique of the zinc-plated coating layer of the surface treatment of nut, do not repeat them here.
As shown in Figures 2 to 5, the present invention also provides a kind of vehicle, and described vehicle comprises vehicle body in white panel beating, bonding bolt assembly and bonding terminal, and described bonding bolt assembly comprises bolt 1 and nut 2.In present embodiment, described bonding bolt assembly can adopt the bonding bolt of M6 model to combine, the Tightening moment of its prepackage is 4 ~ 7Nm, described bonding bolt assembly can also adopt the bonding bolt of M8 model to combine, and the Tightening moment of its prepackage is 6 ~ 9Nm, very close to each other to ensure between bolt 1 and nut 2, thus, on the one hand, the section that can play protection bolt 1 can not be sprayed onto paint, thus ensures the conductivity of the section of bolt 1; On the other hand, can guarantee that bolt assembly is being planted in weldering arc process, bolt 1 can not produce electric arc because of gap, avoids bolt 1 and nut 2 clinkering.
In addition, the bonding bolt of M6 model no matter is adopted to combine, or adopt the bonding bolt combination of M8 model, the industry standard of the equal demand fulfillment respective model of wrench opening degree B4 of the nominal diameter of the nugget diameter A1 of bolt 1 head, the length A2 of bolt 1, bolt 1 screw thread, external diameter B1, the length B2 of nut 2 of nut 2, the end face external diameter B3 of nut 2 and nut 2.
The striking region of bolt 1 head is planted and is welded and fit to the panel beating of vehicle body in white, contact with the forming surface of vehicle body in white to make the head 11 of bolt 1, electrical contact good between the panel beating of bolt 1 head and vehicle body in white can be ensured like this, ensure the conductivity of the head of bolt 1 all the time.The bar portion 12 of bolt 1 is towards the arranged outside of vehicle body, described bonding terminal is located between the head of bolt 1 and nut 2, and the surface of described bonding terminal fits to the overlap joint plane 11a of bolt 1 head 11, contact with the overlap joint plane 11a forming surface of bolt 1 head to make the surface of described bonding terminal.So also can ensure electrical contact good between the head 11 of bonding terminal and bolt 1, in this case, as long as ensure to form face contact closely between bonding terminal and the head 11 of bolt 1, so the two face contact portion formed is then the effective overlap joint area between bonding terminal and panel beating, and then is conducive to the conductivity ensureing bonding terminal and panel beating.
Preferably, the overlap joint plane 11a of the head 11 of bolt 1 is arranged perpendicular to the bar portion of bolt 1, is conducive to described bonding terminal like this and is properly fit onto in the overlap joint plane of bolt 1 head 11, to provide maximum effective overlap joint area.
The panel beating of vehicle body in white has solderability, and thickness is too thin, easy burn-through, and thickness is too thick, can increase tare, is unfavorable for reducing cost, and therefore, the thickness range of the panel beating of vehicle body in white elects 0.8mm ~ 4mm as.
The material of bolt 1 and nut 2 is ML45 cold-forging steel, and ML45 cold-forging steel has excellent mechanical performance.Because bolt 1 and nut 2 in use may be subject to the impact of shearing force, therefore common iron may rupture, and ML35 cold-forging steel can reach 8.8 grades of mechanical performances, thus guarantees bolt 1 and nut 2 not easy fracture.
Preferably, the surface of described bolt 1 arranges the coating layer of zinc-nickel alloy, and the coating layer of zinc-nickel alloy has the reliability that good conductivity can guarantee bonding.In addition, the neutral salt spray test time of the coating layer of zinc-nickel alloy is greater than 800 hours, can guarantee that bolt 1 can not corrode thus.Be prior art in the technique of the coating layer of the surface treatment zinc-nickel alloy of bolt 1, do not repeat them here.
Preferably, the surface of nut 2 arranges zinc-plated coating layer, and the salt mist test time of zinc-plated coating layer is at least 240 hours, thus nut 2 is enough to meet fastening and demand that is simple protection against corrosion effect.Be prior art in the technique of the zinc-plated coating layer of the surface treatment of nut 2, do not repeat them here.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1., for a bonding bolt assembly installation method for vehicle body in white, described bonding bolt assembly comprises bolt and nut, it is characterized in that, comprises the following steps:
Step 1, for installing oil film and the impurity on the surface to be welded of bonding bolt on the panel beating of removing vehicle body in white;
Step 2, pre-installs described bonding bolt assembly;
Step 3, the striking region of the described bolt head in the described bonding bolt assembly be pre-installed is planted the surface described to be welded be soldered in described step 1 to contact with described panel beating forming surface to make the head of described bolt, and the bar portion of described bolt is towards the arranged outside of described vehicle body in white;
Step 4, described nut is taken off from described bolt, according to sequencing, bonding terminal and described nut are inserted in from the afterbody of described bolt respectively, and described nut is screwed until the surface of described bonding terminal fits to the overlap joint plane of described bolt head, contact with the overlap joint plane forming surface of described bolt head to make the surface of described bonding terminal.
2., as claimed in claim 1 for the bonding bolt assembly installation method of vehicle body in white, it is characterized in that, in described step 3, determine to plant weldering electric current according to the thickness of described panel beating.
3., as claimed in claim 2 for the bonding bolt assembly installation method of vehicle body in white, it is characterized in that, the thickness range of described panel beating is 0.8mm ~ 4mm.
4., as claimed in claim 1 for the bonding bolt assembly installation method of vehicle body in white, it is characterized in that, the material of described bolt and described nut is ML45 cold-forging steel.
5., as claimed in claim 4 for the bonding bolt assembly installation method of vehicle body in white, it is characterized in that, the surface of described bolt arranges the coating layer of zinc-nickel alloy, and the neutral salt spray test time of this coating layer is greater than 800 hours.
6., as claimed in claim 4 for the bonding bolt assembly installation method of vehicle body in white, it is characterized in that, the surface of described nut arranges zinc-plated coating layer, and the salt mist test time of this coating layer is at least 240 hours.
7. a vehicle, described vehicle comprises vehicle body in white panel beating, bonding bolt assembly and bonding terminal, described bonding bolt assembly comprises bolt (1) and nut (2), it is characterized in that, the striking region of described bolt (1) head is planted and to be welded and the panel beating fitting to described vehicle body in white contacts with described panel beating forming surface to make the head of described bolt (1), the bar portion of described bolt (1) is towards the arranged outside of vehicle body, described bonding terminal is located between the head of described bolt (1) and described nut (2), and the overlap joint plane that the surface of described bonding terminal fits to described bolt (1) head contacts with the overlap joint plane forming surface of described bolt (1) head to make the surface of described bonding terminal.
8. vehicle as claimed in claim 7, it is characterized in that, the overlap joint plane orthogonal of described bolt (1) head is arranged in the bar portion of described bolt (1).
9. vehicle as claimed in claim 7, it is characterized in that, the thickness range of described panel beating is 0.8mm ~ 4mm.
10. the vehicle according to any one of claim 7 to 9, it is characterized in that, the material of described bolt and described nut is ML45 cold-forging steel, the surface of described bolt arranges the coating layer of zinc-nickel alloy, the neutral salt spray test time of the coating layer of this zinc-nickel alloy is greater than 800 hours, the surface of described nut arranges zinc-plated coating layer, and the salt mist test time of this zinc-plated coating layer is at least 240 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510934221.0A CN105552690A (en) | 2015-12-15 | 2015-12-15 | Negative ground bolt installation method for vehicle body in white and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510934221.0A CN105552690A (en) | 2015-12-15 | 2015-12-15 | Negative ground bolt installation method for vehicle body in white and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105552690A true CN105552690A (en) | 2016-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510934221.0A Pending CN105552690A (en) | 2015-12-15 | 2015-12-15 | Negative ground bolt installation method for vehicle body in white and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105552690A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015251A (en) * | 2016-07-29 | 2016-10-12 | 奇瑞新能源汽车技术有限公司 | Bonding bolt structure for total aluminum white body of electric automobile |
| CN113458719A (en) * | 2021-06-07 | 2021-10-01 | 东风柳州汽车有限公司 | Sheet metal structure for body-in-white and manufacturing method thereof |
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| DE102007026239A1 (en) * | 2006-06-02 | 2007-12-06 | Newfrey Llc, Newark | Production of a electrical connection between an electrical contact element and a metal sheet used in the production of a grounding contact on a vehicle chassis comprises fixing a bolt to the metal sheet and further processing |
| CN200992179Y (en) * | 2006-12-26 | 2007-12-19 | 奇瑞汽车有限公司 | Pencil bonding spot structure |
| CN201937017U (en) * | 2010-11-23 | 2011-08-17 | 浙江吉利汽车研究院有限公司 | Connection structure for wiring harness bonding |
| CN202716825U (en) * | 2012-07-25 | 2013-02-06 | 北京汽车股份有限公司 | Body ground structure |
| CN103307081A (en) * | 2013-06-26 | 2013-09-18 | 靖江市新程汽车零部件有限公司 | Combined nut and projection welding method thereof |
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2015
- 2015-12-15 CN CN201510934221.0A patent/CN105552690A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007026239A1 (en) * | 2006-06-02 | 2007-12-06 | Newfrey Llc, Newark | Production of a electrical connection between an electrical contact element and a metal sheet used in the production of a grounding contact on a vehicle chassis comprises fixing a bolt to the metal sheet and further processing |
| CN200992179Y (en) * | 2006-12-26 | 2007-12-19 | 奇瑞汽车有限公司 | Pencil bonding spot structure |
| CN201937017U (en) * | 2010-11-23 | 2011-08-17 | 浙江吉利汽车研究院有限公司 | Connection structure for wiring harness bonding |
| CN202716825U (en) * | 2012-07-25 | 2013-02-06 | 北京汽车股份有限公司 | Body ground structure |
| CN103307081A (en) * | 2013-06-26 | 2013-09-18 | 靖江市新程汽车零部件有限公司 | Combined nut and projection welding method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015251A (en) * | 2016-07-29 | 2016-10-12 | 奇瑞新能源汽车技术有限公司 | Bonding bolt structure for total aluminum white body of electric automobile |
| CN113458719A (en) * | 2021-06-07 | 2021-10-01 | 东风柳州汽车有限公司 | Sheet metal structure for body-in-white and manufacturing method thereof |
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Application publication date: 20160504 |
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