CN109746318B - Method for manufacturing explosion-proof sheet - Google Patents
Method for manufacturing explosion-proof sheet Download PDFInfo
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- CN109746318B CN109746318B CN201910061073.4A CN201910061073A CN109746318B CN 109746318 B CN109746318 B CN 109746318B CN 201910061073 A CN201910061073 A CN 201910061073A CN 109746318 B CN109746318 B CN 109746318B
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Abstract
The invention provides a manufacturing method of an explosion-proof sheet, and relates to the technical field of power batteries. The method comprises the following steps: placing a sheet material between a first die portion and a second die portion of an extrusion die, wherein the first die portion comprises a first protrusion and a first groove disposed around the first protrusion, and the volume of the first protrusion is equal to the volume of the first groove; and controlling the first die part and the second die part to extrude the plate, wherein the first groove is filled and filled with the first deformation generated by the first protrusion extruding plate. According to the embodiment of the invention, the volume of the first bulge is equal to that of the first groove, so that the first deformation generated by extruding the plate by the first bulge is used for filling and filling the first groove and is not used for filling the area except the explosion-proof sheet formed on the plate, thereby effectively reducing the residual material amount on the plate and further reducing the cost of the explosion-proof sheet.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a manufacturing method of an explosion-proof sheet.
Background
At present, electric vehicles and hybrid vehicles are becoming a great trend to replace fuel vehicles. The power battery pack is used as a core power energy source of the electric automobile, and the safety of the power battery pack is particularly important. Specifically, when the power battery pack operates abnormally, a large amount of gas is generated inside the power battery, which causes a sharp increase in the internal pressure of the power battery. At this time, if the pressure is not reduced in time, the power battery will explode, causing a safety accident. In order to avoid explosion, an explosion-proof sheet is usually disposed on the power battery to release the pressure inside the power battery, so as to reduce the explosion of the power battery in an unexpected situation.
However, for the industry of producing the explosion-proof sheet, how to reduce the production cost of the explosion-proof sheet is an ancient constant topic.
Disclosure of Invention
In view of the above, embodiments of the present invention are directed to providing a method for manufacturing an explosion-proof plate, so as to solve the problem in the prior art that the production cost of the explosion-proof plate needs to be reduced.
The invention provides a manufacturing method of an explosion-proof sheet, which comprises the following steps: placing a sheet material between a first die portion and a second die portion of an extrusion die, wherein the first die portion comprises a first protrusion and a first groove disposed around the first protrusion, and the volume of the first protrusion is equal to the volume of the first groove; and controlling the first die part and the second die part to extrude the plate, wherein the first groove is filled and filled with the first deformation generated by the first protrusion extruding plate.
In one embodiment of the present invention, controlling the first die section and the second die section to extrude the sheet material comprises: and controlling the first die part and the second die part to extrude the plate at one time.
In an embodiment of the present invention, before controlling the first die section and the second die section to extrude the plate material at one time, the manufacturing method further includes: and (4) blanking the plate to form an extrusion extension area.
In one embodiment of the present invention, the extrusion die further includes a first surface disposed at a periphery of the first groove, wherein a second deformation generated by the first surface extruding the sheet material is expanded in the extrusion expansion region.
In one embodiment of the invention, the first protrusion comprises a second surface for extruding the sheet material, wherein the first surface and the second surface are coplanar.
In one embodiment of the invention, the dimension of the first protrusion in the protruding direction of the first protrusion is 0.4 mm.
In one embodiment of the present invention, the first protrusion extrudes the plate material to form the central groove of the rupture disk, and after controlling the first die part and the second die part to extrude the plate material, the manufacturing method further comprises: and extruding the bottom surface of the central groove to form an indentation on the bottom surface of the central groove.
In one embodiment of the invention, the indentation has a dimension of 0.05mm in the direction of projection of the first protrusion.
In one embodiment of the invention, the indentation is in the form of a non-closed loop.
In one embodiment of the invention, the thickness of the sheet material is 0.3 mm.
According to the embodiment of the invention, the volume of the first bulge is equal to that of the first groove, so that the first deformation generated by extruding the plate by the first bulge is used for filling and filling the first groove and is not used for filling the area except the explosion-proof sheet formed on the plate, the residual material amount on the plate is effectively reduced, and the cost of the explosion-proof sheet is further reduced.
Drawings
Fig. 1 is a schematic flow chart of a method of manufacturing an explosion-proof panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a deformation of a sheet material according to one embodiment of the present invention.
Fig. 3 is a schematic structural view of an explosion-proof sheet according to an embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a rupture disc according to one embodiment of the present invention.
Fig. 5 is a schematic structural view of an extrusion die according to an embodiment of the present invention.
Figure 6a is a schematic cross-sectional view of an indentation according to an embodiment of the invention.
Figure 6b is a schematic top view of an indentation according to an embodiment of the invention.
Fig. 7 is a schematic view of a manufacturing process of the rupture disk according to an embodiment of the present invention.
The reference numbers in the above figures are as follows:
edge 1, central groove 2, bottom surface 21, indentation 3, first score line 31, second score line 32, third score line 33, first mold portion 4, first protrusion 41, second surface 411, first groove 42, first surface 43, sheet 5, first deformation 51, filling deformation 52, partial sheet 53, second mold portion 6.
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.
Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
In order to reduce the cost of the explosion-proof disc, the inventor researches the production process of the explosion-proof disc, and finds that after the explosion-proof disc product falls off from the plate, a lot of materials still remain on the plate, but the remaining materials cannot be directly used for manufacturing the explosion-proof disc again, so that the cost of the remaining materials is inevitably saved in the cost of the explosion-proof disc.
Therefore, the inventor researches that the production cost of the explosion-proof sheet can be reduced to a great extent if the amount of residual materials of the sheet can be reduced in the process of producing the explosion-proof sheet.
Fig. 1 is a schematic flow chart of a method of manufacturing an explosion-proof panel according to an embodiment of the present invention. Fig. 2 is a schematic diagram of the deformation of a sheet 5 according to one embodiment of the invention. Fig. 3 is a schematic structural view of an explosion-proof sheet according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a rupture disc according to one embodiment of the present invention. Fig. 5 is a schematic structural view of an extrusion die according to an embodiment of the present invention.
Based on this, the present invention provides a method for manufacturing an explosion-proof sheet, as shown in fig. 1, the method comprising:
step 110: the sheet 5 is placed between the first mould part 4 and the second mould part 6 of the extrusion mould, wherein the first mould part 4 comprises a first protrusion 41 and a first recess 42 arranged around the first protrusion 41, the volume of the first protrusion 41 being equal to the volume of the first recess 42.
Specifically, as shown in fig. 3 and 5, the first protrusion 41 of the first mold part 4 may be used to form the central groove 2 of the rupture disk, and the first groove 42 of the first mold part 4 may be used to form the edge 1 of the rupture disk.
Step 120: the first die part 4 and the second die part 6 are controlled to press the sheet material 5, wherein the first deformation 51 of the sheet material 5 pressed by the first protrusion 41 fills and fills the first groove 42.
Specifically, as shown in fig. 2, during the process that the first and second die sections 4 and 6 press the sheet material 5, the first protrusion 41 presses the sheet material 5 to generate a deformation, which may be referred to as a first deformation 51 for convenience of description. The first deformation 51 does not disappear by void, but enters the first groove 42 along with the extrusion process, and for convenience of description, the deformation entering the first groove 42 can be referred to as filling deformation 52. In other words, the filling deformation 52 is the first deformation 51, and the volume of the first deformation 51 and the volume of the filling deformation 52 are equal.
It will be appreciated that during the extrusion of the sheet 5, the first protrusion 41 will gradually approach the second mould part 6 and, correspondingly, the first recess 42 will also gradually approach the second mould part 6. During the approach of the first groove 42 to the second mold part 6, the filling deformation 52 and a portion of the sheet material gradually enter the first groove 42, and when the step of controlling the first mold part 4 and the second mold part 6 to press the sheet material 5 is finished, i.e. the step 120 is finished, the filling deformation 52 and a portion of the sheet material 53 fill the first groove 42. Here, the partial plate 53 refers to a portion of the plate 5 corresponding to the first groove 42, and when the first groove 42 approaches the second mold portion 6, the partial plate 53 enters the first groove 42, and the filling deformation 52 is used to fill and fill the first groove 42.
In the embodiment of the invention, the volume of the first protrusion 41 is set to be equal to the volume of the first groove 42, so that the first deformation 51 generated by the first protrusion 41 extruding the plate 5 is used for filling and filling the first groove 42, and is not used for filling the area except the explosion-proof sheet formed on the plate 5, thereby effectively reducing the residual material amount on the plate 5 and reducing the cost of the explosion-proof sheet.
In an embodiment of the present invention, before controlling the first die section 4 and the second die section 6 to extrude the plate material 5, the manufacturing method may further include: the sheet 5 is blanked to form a pressing extension area so as to reserve an extension space for the pressing sheet 5.
Specifically, as shown in fig. 5, the extrusion die may further include a first surface 43 disposed at the periphery of the first groove 42, wherein the first surface 43 may correspond to the extrusion extension region, so that a second deformation generated by the first surface 43 extruding the sheet 5 may be extended at the extrusion extension region during the process of controlling the first die part 4 and the second die part 6 to extrude the sheet 5.
In one embodiment of the present invention, as shown in fig. 5, the first protrusion 41 may include a second surface 411 for extruding the sheet material 5, wherein the first surface 43 and the second surface 411 are coplanar.
Specifically, in the process of controlling the first and second die parts 4 and 6 to press the sheet material 5, the second surface 411 of the first protrusion 41 and the sheet material 5 contact each other and force the sheet material 5 to deform, resulting in the first deformation 51. In order to avoid that the first deformation 51 enters the first recess 42 and then enters the extrusion extension zone for extension during extrusion, i.e. in order to avoid excess material remaining on the sheet 5, the first surface 43 and the second surface 411 are arranged coplanar.
In an embodiment of the present invention, where the thickness of the sheet material 5 is 0.3mm, controlling the first die section 4 and the second die section 6 to press the sheet material 5 may include: the first die part 4 and the second die part 6 are controlled to extrude the plate 5 at one time.
Specifically, in the process of manufacturing the explosion-proof sheet, a plate 5 with a thickness of 0.5mm is generally adopted at present, and the thickness of the formed explosion-proof sheet is also 0.5mm in the thickness direction, namely the thickness at the edge 1 is 0.5mm, but the thickness of the bottom of the central groove 2 of the explosion-proof sheet is only 0.1 mm. That is, in the course of extrusion, the die needs to be extruded to a depth of 0.4mm, which is very difficult for the extrusion equipment, and in order to be able to form a depth of 0.4mm, the extrusion equipment may need to perform extrusion twice, that is, the first extrusion is to a depth of 0.2mm, and the second extrusion is to a depth of 0.2mm, thereby forming a depth of 0.4mm in total.
However, for the manufacturing method of the present invention, the first deformation 51 generated by the first protrusion 41 pressing the plate 5 is used for filling and forming the edge 1 of the rupture disk through the limitation of the first groove 42, as shown in fig. 2, which is equivalent to taking out part of the material of the plate 5 to form the central groove 2 of the rupture disk, and the taken-out material is used for heightening the part corresponding to the edge 1 of the rupture disk, so that the size of the edge 1 of the formed rupture disk can meet the requirement of the design size.
In addition, because the thickness of the adopted plate 5 is 0.3mm in the manufacturing method of the invention, the bottom of the central groove 2 of the explosion-proof sheet with the thickness of 0.1mm can be formed only by extruding the first bulge 41 with the depth of 0.2mm in the process of extruding the plate 5, in other words, the extrusion can be completed by the extrusion equipment once, so that the production efficiency of the explosion-proof sheet is improved, and the energy consumed by the extrusion equipment for extrusion is saved.
In one embodiment of the present invention, in order to form the explosion-proof sheet with a thickness of 0.1mm at the bottom of the central groove 2 and a thickness of 0.5mm at the edge 1, the first protrusion 41 has a dimension of 0.4mm in the protruding direction of the first protrusion 41.
Specifically, the first protrusion 41 is pressed down to a depth of 0.2mm, and accordingly, the first groove 42 is inserted into the sheet 5 having a height of 0.2 mm. Since the first deformation 51 generated by the first protrusion 41 pressing the plate 5 fills and fills the first groove 42, the first deformation 51 forms a height of 0.2mm, and a portion corresponding to 0.1mm of the bottom of the central groove 2 of the rupture disk is added, so that the edge 1 of the rupture disk of 0.5mm is formed.
Fig. 6a is a schematic cross-sectional view of an indentation 3 according to an embodiment of the invention. Fig. 6b is a schematic top view of an indentation 3 according to an embodiment of the invention. Fig. 6a is a partial enlarged view of a dotted area in fig. 4, and fig. 6b is a partial enlarged view of a dotted area in fig. 3.
In an embodiment of the present invention, the first protrusion 41 presses the plate 5 to form the central groove 2 of the rupture disk, and after controlling the first die part 4 and the second die part 6 to press the plate 5 once, the manufacturing method may further include: the bottom surface 21 of the central recess 2 is pressed, forming an indentation 3 in the bottom surface 21 of the central recess 2.
Specifically, after the center groove 2 of the explosion-proof sheet is formed, it is necessary to further prepare an indentation 3 on the bottom surface 21 of the center groove 2. Here, the indentations 3 may be used to release the pressure within the power cell. Specifically, the power battery may have a problem of increased internal pressure during use, and in order to avoid explosion caused by excessive internal pressure of the power battery, the pressure in the power battery may be released by breaking the indentation 3 of the explosion-proof sheet, so as to avoid explosion. For example, the size of the indentation 3 may be 0.05mm in the protruding direction along the first protrusion 41, thereby reducing the difficulty of the rupture disk being ruptured.
In one embodiment of the present invention, the indentation 3 may be in a non-closed ring shape to prevent fragments formed by the rupture disk from falling off randomly after the rupture disk is broken. Specifically, as shown in fig. 6a and 6b, the indentation 3 may include three score lines, namely a first score line 31, a second score line 32 and a third score line 33, wherein the first score line 31 is connected end to end, and the second score line 32 and the third score line 33 are not connected end to end, so that the formed indentation 3 may present a non-closed ring shape, and further, under the action of the first score line 31, fragments formed by the bursting disc being burst can still remain on the bursting disc, rather than falling off at will.
In one embodiment of the invention, the first mould part 4 may be located above the second mould part 6 in order to facilitate the formation of the rupture disc.
The following describes the manufacturing process of the rupture disk in detail with reference to examples.
Fig. 7 is a schematic view of a manufacturing process of the rupture disk according to an embodiment of the present invention.
After placing the sheet 5 between the first and second die parts 4, 6 of the extrusion die, the manufacturing process may include:
step 710: the sheet 5 is blanked to form a first extrusion extension.
Step 720: the sheet 5 is blanked to form a second extended extrusion zone.
In particular, the crush zones are disposed around the formed rupture disc. In order to facilitate the preparation of the crush extension, the crush extension may be divided into two types, i.e., a first crush extension and a second crush extension, and accordingly, the first crush extension and the second crush extension are prepared, respectively.
Step 730: the first die part 4 and the second die part 6 are controlled to extrude the plate 5 once to form the central groove 2 and the edge 1 of the explosion-proof sheet.
Specifically, the first mold part 4 may be disposed above the second mold part 6, and the first mold part 4 includes a first protrusion 41 and a first groove 42 disposed around the first protrusion 41, and a volume of the first protrusion 41 is equal to a volume of the first groove 42.
When the first and second mold portions 4 and 6 extrude the plate 5 at a time, the first deformation 51 generated by the first protrusion 41 extruding the plate 5 fills and fills the first groove 42, so that the first protrusion 41 extrudes the plate 5 to form the central groove 2 of the rupture disk, and the first groove 42 fills the first deformation 51 and a portion of the plate 53, thereby forming the edge 1 of the rupture disk.
Step 740: the bottom surface 21 of the central recess 2 is pressed, forming an indentation 3 in the bottom surface 21 of the central recess 2.
In particular, the indentation 3 may comprise three score lines, respectively a first score line 31, a second score line 32 and a third score line 33, wherein the first score line 31 is connected end to end, while the second score line 32 and the third score line 33 are disconnected end to end, so that the formed indentation 3 may assume a non-closed ring shape.
Step 750: the plate 5 is punched out so that the formed explosion-proof sheet falls off from the plate 5.
Specifically, step 750 may refer to a blanking process, in which the explosion-proof sheet is peeled off from the plate 5 to form a finished product of the explosion-proof sheet.
In the embodiment of the invention, the volume of the first protrusion 41 is set to be equal to the volume of the first groove 42, so that the first deformation 51 generated by the first protrusion 41 extruding the plate 5 is used for filling and filling the first groove 42, but not used for filling the area except the explosion-proof sheet formed on the plate 5, thereby effectively reducing the amount of the residual material on the plate 5 and further reducing the cost of the explosion-proof sheet.
Note that, in this document, the thickness refers to a dimension in a direction parallel to the projecting direction of the first projection 41.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A method of manufacturing an explosion-proof sheet, comprising:
placing a sheet material between a first die portion and a second die portion of an extrusion die, wherein the first die portion includes a first protrusion and a first groove disposed around the first protrusion, a volume of the first protrusion being equal to a volume of the first groove; and
and controlling the first die part and the second die part to extrude the plate, wherein the first bulge extrudes the plate to form a central groove of the explosion-proof sheet, and the first bulge extrudes a first deformation generated by the plate to fill and fill the first groove to form the edge of the explosion-proof sheet.
2. The method of manufacturing of claim 1, wherein said controlling the first die portion and the second die portion to press the sheet material comprises:
and controlling the first die part and the second die part to extrude the plate at one time.
3. The manufacturing method according to claim 1, wherein before the controlling the first die section and the second die section to press the plate material, the manufacturing method further comprises:
and blanking the plate to form an extrusion extension area.
4. The method of manufacturing according to claim 3, wherein the extrusion die further comprises a first surface disposed at a periphery of the first groove, wherein a second deformation generated by the first surface extruding the sheet material is expanded at the extrusion expansion region.
5. The method of manufacturing of claim 4, wherein the first protrusion includes a second surface for extruding the sheet of material, wherein the first surface and the second surface are coplanar.
6. The manufacturing method according to claim 1, wherein a dimension of the first projection in a projecting direction of the first projection is 0.4 mm.
7. The manufacturing method according to claim 1, wherein after the controlling the first die section and the second die section to press the plate material, the manufacturing method further comprises:
pressing a bottom surface of the central groove to form an indentation on the bottom surface of the central groove.
8. The manufacturing method according to claim 7, wherein a size of the indentation in a projecting direction along the first projection is 0.05 mm.
9. The method of manufacturing according to claim 7, wherein the indentation is in the form of a non-closed loop.
10. A manufacturing method according to any one of claims 1 to 9, characterized in that the thickness of the sheet material is 0.3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910061073.4A CN109746318B (en) | 2019-01-22 | 2019-01-22 | Method for manufacturing explosion-proof sheet |
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| CN201910061073.4A CN109746318B (en) | 2019-01-22 | 2019-01-22 | Method for manufacturing explosion-proof sheet |
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| CN109746318B true CN109746318B (en) | 2020-08-21 |
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| CN110369601B (en) * | 2019-06-27 | 2020-11-24 | 上海空间推进研究所 | Fracture diaphragm tool integrating notch machining and appearance machining and using method thereof |
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