CN114985594B - Lithium battery top cover plate and explosion-proof valve mounting hole forming process thereof - Google Patents
Lithium battery top cover plate and explosion-proof valve mounting hole forming process thereof Download PDFInfo
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- CN114985594B CN114985594B CN202210931992.4A CN202210931992A CN114985594B CN 114985594 B CN114985594 B CN 114985594B CN 202210931992 A CN202210931992 A CN 202210931992A CN 114985594 B CN114985594 B CN 114985594B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 77
- 239000007769 metal material Substances 0.000 claims description 53
- 239000007788 liquid Substances 0.000 claims description 41
- 238000009966 trimming Methods 0.000 claims description 39
- 238000004080 punching Methods 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 8
- 238000007493 shaping process Methods 0.000 description 14
- 238000004880 explosion Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/001—Shaping combined with punching, e.g. stamping and perforating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention discloses a lithium battery top cover plate and an explosion-proof valve mounting hole forming process thereof.A closed lower concave part is formed in advance by utilizing a stamping and stretching process to serve as an explosion-proof valve mounting hole pre-forming structure on the top cover plate, and in the process of stamping and forming the closed lower concave part, the middle material of the closed lower concave part is extruded to the annular side part, so that the thickness of a flange after forming is increased, the requirements on the thickness and the height of the flange are met, and the technical problem that the flange forming material of the explosion-proof valve mounting hole of the existing stamping process is insufficient is solved.
Description
Technical Field
The invention relates to the technical field of battery manufacturing for new energy automobiles, in particular to a lithium battery top cover plate and an explosion-proof valve mounting hole forming process thereof.
Background
At present, new energy lithium batteries are increasingly popularized, and become an important direction of energy competition in the future, and green energy also becomes a key development direction in the future. In order to improve the market competitiveness of lithium batteries, the precision requirement and the size consistency requirement of products are more strict, and the stability of equipment and the consistency of products become more important under the harsh market competition. The continuous forming process of the explosion-proof valve mounting hole on the lithium battery top cover plate in the prior art can not punch and form the flange at the edge of the explosion-proof valve mounting hole opening, so that the lithium battery top cover plate can not meet the product requirements.
Disclosure of Invention
In order to solve at least one technical defect, the invention provides the following technical scheme:
the lithium battery top cover plate and the explosion-proof valve mounting hole forming process thereof comprise the following steps:
s1, conveying a metal material belt between an upper die and a lower die of a continuous blanking die in a continuous stepping mode towards a blanking direction, and punching a formed lithium battery top cover plate and at least one pole column hole in the lithium battery top cover plate on the metal material belt in the conveying process;
s2, in the continuous step-by-step conveying process of the metal material belt, a closed lower concave part is formed in a punching forming area on the lithium battery top cover plate in a punching mode, the closed lower concave part comprises an annular side part and a middle part located in an inner hole of the annular side part, a round angle is formed between the lower half part of the annular side part and the front face of the lithium battery top cover plate, the thickness of the middle part is smaller than that of the annular side part under the action of extrusion force during punching of the middle part, and the height of the closed lower concave part is H;
s3, stamping the annular surface at the upper end of the annular side part and the cavity of the closed type lower concave part in the continuous step-by-step conveying process of the metal material belt so as to enable the annular surface at the upper end of the annular side part to sink and enable the edge of the annular surface to form an annular side wall, enabling the height of the closed type lower concave part to be H-X, and enabling the inner wall surface of the annular side part to be vertical to the inner plane of the middle part;
s4, in the continuous step-by-step conveying process of the metal material belt, stamping the annular surface at the upper end of the annular side part to form an annular recess continuously arranged along the annular side wall, forming a convex ring at the inner edge of the annular recess, stamping the lower end of the closed type lower concave part to form a concave part, and forming an annular boss according to the inner wall of the concave part, wherein the distance between the inner bottom surface of the annular recess and the top surface of the convex ring is L;
and S5, blanking and removing the middle part of the closed lower concave part in the continuous stepping conveying process of the metal material belt to form an explosion-proof valve mounting hole and an annular positioning groove positioned on the end surface of the lower half part of the annular side part, wherein the lower half part of the annular side part is used as a flange of the edge of the explosion-proof valve mounting hole.
According to the lithium battery top cover plate and the explosion-proof valve mounting hole forming process thereof, in the step S1:
step S11, in the continuous step-by-step conveying process of the metal material belt, punching a top cover plate punching area on the metal material belt to form two oppositely arranged pole column holes and a guide hole positioned at the edge of the metal material belt;
step S12, in the continuous stepping conveying process of the metal material belt, punching the top cover plate punching area to form a liquid injection hole mark position, and a first trimming hole and a second trimming hole which are respectively positioned at two ends of the top cover plate punching area and at one side of the top cover plate punching area;
step S13, in the continuous stepping conveying process of the metal material belt, respectively blanking and forming T-shaped trimming holes at two ends of the trimming holes II in the blanking area of the top cover plate, wherein the T-shaped trimming holes are communicated with the trimming holes II so as to form one side edge shape of the top cover plate of the lithium battery in the blanking area of the top cover plate, and then entering step S14;
and S14, respectively blanking T-shaped trimming holes at two ends of the trimming holes between two adjacent blanking areas of the top cover plate in the continuous stepping conveying process of the metal material belt, so that the edge shape of the lithium battery top cover plate is formed on two opposite sides in one blanking area of the top cover plate, the lithium battery top cover plate connected with the metal material belt through a connector is formed, and the edge shape of one side of the lithium battery top cover plate and the trimming holes are formed on two opposite sides in the other blanking area of the top cover plate.
According to the lithium battery top cover plate and the explosion-proof valve mounting hole forming process thereof, the step S3 further comprises the forming of a first liquid injection hole, a first reverse buckling hole and a first pole positioning groove: the metal material area is in continuous marching type transportation process, carries out the blanking and the shaping annotates liquid hole one to annotating liquid hole mark position to and close on the continuous utmost point post constant head tank one that sets up of mouthful along the marginal blanking shaping at lithium cell top cover piece back on the utmost point post hole, carry out blanking shaping back-off hole one to the back of lithium cell top cover piece.
According to the forming process of the lithium battery top cover plate and the explosion-proof valve mounting hole of the lithium battery top cover plate, in the step S4, the forming process further comprises the following steps of injecting a second liquid injection hole and forming an annular bulge: the metal material area is in continuous step-by-step transportation process, annotates liquid hole two to the mouth edge of annotating liquid hole one and punches and the shaping to the mouth edge in back-off hole punches and the shaping annular is protruding.
According to the lithium battery top cover piece and the explosion-proof valve mounting hole forming process thereof, an appearance chamfer forming step is further included between the step S4 and the step S5, and the metal material belt performs punching and forming of an inclined chamfer on the edge of the formed lithium battery top cover piece in the continuous stepping conveying process.
According to above lithium battery top cover piece and explosion-proof valve mounting hole forming process thereof, still include in step S5 annotate liquid hole one, annotate liquid hole two and the blanking is maintained to utmost point post hole to and the shaping step of utmost point post constant head tank two, the metal material area is in continuous marching type transportation process, utilize to annotate liquid hole drift and utmost point post hole drift respectively to annotate liquid hole one, annotate liquid hole two and the blanking is maintained to utmost point post hole, simultaneously, close on positive mouthful of lithium battery top cover piece along department' S blanking shaping has the utmost point post constant head tank two of continuous setting.
According to the lithium battery top cover piece and the anti-explosion valve mounting hole forming process thereof, step S6, the metal material belt performs punching forming chamfering on the opening edge close to the back surface of the lithium battery top cover piece (200) on the pole column hole, the opening edge close to the back surface of the lithium battery top cover piece on the anti-explosion valve mounting hole and the opening edge close to the back surface of the lithium battery top cover piece on the liquid injection hole I in the continuous stepping conveying process.
Compared with the prior art, the lithium battery top cover plate and the anti-explosion valve mounting hole forming process have the beneficial effects that:
the closed type lower concave part is pre-formed by a stamping and stretching process to serve as an anti-explosion valve mounting hole pre-forming structure on the top cover plate, and in the process of stamping the closed type lower concave part, the middle material of the closed type lower concave part is extruded to the annular side part, so that the thickness of the flange after being formed is increased, the requirements for the thickness and the height of the flange are met, and the technical problem that the flange forming material of the anti-explosion valve mounting hole of the existing stamping process is insufficient is solved.
The annular positioning groove is mainly used for positioning and fixing the protective film of the explosion-proof valve, and the annular recess is mainly used for positioning the annular convex part on the explosion-proof valve.
Drawings
FIG. 1 is a flow chart of an integrated molding process;
FIG. 2 is a cross-sectional view of the metal strip at the four forming station position and at the five forming station position;
FIG. 3 is a cross-sectional view of the metal strip at six positions of the forming station;
FIG. 4 is a cross-sectional view of the metal strip at eight locations of the forming station;
FIG. 5 is a schematic diagram of a front structure of a top cover sheet of a lithium battery;
FIG. 6 is a schematic structural diagram of the back surface of a top cover sheet of a lithium battery;
FIG. 7 isbase:Sub>A sectional view A-A of FIG. 6;
FIG. 8 is a sectional view taken along line B-B of FIG. 5;
fig. 9 is an enlarged view at a of fig. 8.
In the figure: the forming device comprises a forming station I1, a forming station II 2, a forming station III 3, a forming station IV 4, a forming station V5, a forming station VI 6, a forming station VII 7, a forming station VIII 8, a forming station nine 9, a blanking station 10, a pole column hole 11, a guide hole 12, a fillet 13, a trimming hole I20, a trimming hole II 21, a T-shaped trimming hole 30, a closed lower concave part 40, an annular side part 41, a middle part 42, a cavity 43, a pole column positioning groove I50, an annular side wall 51, a liquid injection hole I52, an annular surface 53, an inverted buckle hole 54, an annular recess 61, a convex ring 62, a liquid injection hole II 63, a concave part 64, an annular protrusion 65, an inclined chamfer 70, an explosion-proof valve mounting hole 80, an annular positioning groove 81, a pole column positioning groove II 82, a chamfer 83, a metal material belt 100, a lithium battery top cover plate 200 and a flange 201.
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 that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Example (b):
as shown in fig. 1-9, the lithium battery top cover piece and the explosion-proof valve mounting hole forming process thereof described in this embodiment adopt a continuous blanking die to perform continuous stamping and blanking forming, the continuous blanking die sequentially comprises a forming station one 1 for forming the pole holes 11 and the guide holes 12, a forming station two 2 for forming the injection hole mark positions, the trimming hole one 20 and the trimming hole two 21, a forming station three 3 for forming the T-shaped trimming hole 30, a forming station four 4 for forming the closed lower concave part 40, a forming station five 5 for forming the annular side wall 51, the injection hole one 52, the back-off hole 54 and the pole positioning groove one 50, a forming station six 6 for forming the annular recess 61, the convex ring 62, the concave part 64, the annular boss, the injection hole two 63 and the annular protrusion 65, a forming station seven 7 for forming the edge chamfer 70 of the lithium battery top cover piece 200, a forming station eight 8 for trimming, blanking and forming the injection hole one 52, the injection hole two 63 and the pole hole 11, a forming station eight forming station for forming the injection hole edge edges of the explosion-proof valve mounting hole 80 and the explosion-proof valve mounting hole 100, and the forming process of the metal top cover piece can meet the following steps of forming and the explosion-proof valve mounting hole forming process.
Step S1, the metal material belt 100 is conveyed between an upper die and a lower die of a continuous blanking die in a continuous stepping mode towards a blanking direction, and in the conveying process, the metal material belt 100 is subjected to the blanking process of the steps S11-S14 to form the lithium battery top cover piece 200 and two pole column holes 11 in the lithium battery top cover piece 200, wherein the metal material belt 100 is an aluminum material belt.
Specifically, in step S11, in the continuous step-by-step conveying process of the metal material strip 100, two pole holes 11 oppositely arranged and a guide hole 12 located at the edge of the metal material strip 100 are punched and formed in a top cover sheet punching area on the metal material strip 100; wherein bullport 12 mainly used metal material area 100 carries out continuous punching press between the last mould of continuous blanking mould and lower mould to and blanking forming process fixes a position metal material area 100, and the guide needle of mould inserts in the bullport 12 during the location, thereby the material takes place the displacement when avoiding blanking, and two utmost point post holes 11 are used for anodal utmost point post and negative pole post installation respectively, and bullport 12 and utmost point post hole 11 are circular utmost point post hole.
Step S12, in the continuous stepping conveying process of the metal material belt 100, a liquid injection hole mark position, a first trimming hole 20 and a second trimming hole 21 are formed in a blanking area of the top cover plate in a blanking mode, wherein the first trimming hole 20 and the second trimming hole are respectively located at two ends of the blanking area of the top cover plate; in its step, the preliminary shaping is carried out mainly to the both ends edge of lithium cell top cap piece 200 in the side cut hole one 20, and the preliminary shaping is carried out for a side edge of lithium cell top cap piece 200 in the side cut hole two 21.
Step S13, in the continuous stepping conveying process of the metal material belt 100, respectively blanking and forming T-shaped trimming holes 30 at two ends of the trimming hole II 21 in the top cover plate blanking area, wherein the T-shaped trimming holes 30 are communicated with the trimming hole II 21 to form one side edge shape of the lithium battery top cover plate 200 in the top cover plate blanking area, and then entering step S14; the steps are mainly used for completely forming one side edge of the top cover piece 200 of the lithium battery and preparing for forming the outer contour shape of the top cover piece 200 of the lithium battery.
Step S14, in the continuous stepping conveying process of the metal material belt 100, T-shaped trimming holes 30 are respectively punched at two ends of a trimming hole II 21 between two adjacent top cover plate punching areas, so that the edge shape of a lithium battery top cover plate 200 is formed at two opposite sides in one top cover plate punching area, a lithium battery top cover plate 200 connected with the metal material belt 100 through a connector is formed, the edge shape of one side of the lithium battery top cover plate 200 and the trimming hole II 21 are respectively formed at two opposite sides in the other top cover plate punching area, the lithium battery top cover plate 200 is basically formed on the material belt through the punching of the step, and the formed lithium battery top cover plate 200 is still connected to the metal material belt through an un-punched part.
Step S2, in the continuous step-by-step conveying process of the metal strip 100, a closed lower concave portion 40 is formed in a punching forming area on the lithium battery top cover piece 200 in a punching forming mode, the closed lower concave portion 40 comprises an annular side portion 41 and a middle portion 42 located in an inner hole of the annular side portion 41, a round angle 13 is formed between the lower half portion of the annular side portion 41 and the front face of the lithium battery top cover piece 200, and under the extrusion force of the middle portion 42 in the stamping process, the material of the middle portion 42 is extruded onto the annular side portion 41, the thickness of the annular side portion 41 is increased, preparation is made for forming the flange 201 and meeting the requirements of the thickness and the height of the flange 201, the thickness of the middle portion 42 is smaller than that of the annular side portion 41, and the height of the closed lower concave portion 40 is H.
And S3, in the continuous stepping conveying process of the metal material belt 100, stamping an annular surface 53 at the upper end of the annular side part 41 and a cavity 43 of the closed type lower concave part 40, wherein the stamping of the cavity 43 mainly shapes the inner wall surface of the cavity 43 of the closed type lower concave part 40, and after stamping, the annular surface 53 at the upper end of the annular side part 41 sinks to enable the edge to form an annular side wall 51, the height of the closed type lower concave part 40 is H-X, and the inner wall surface of the cavity 43 of the closed type lower concave part 40 is vertical, so that the inner wall surface of the annular side part 41 is vertical to the inner plane of the middle part 42, and the molding requirement of the explosion-proof valve mounting hole 80 is met.
Preferably, the molding of the first injection hole 52, the first back-off hole 54 and the first pole positioning groove 50 is also included: the metal material strap 100 is in continuous step-by-step transportation process, to annotating liquid hole mark position blanking and shaping notes liquid hole 52 to and close on the utmost point post hole 11 the continuous utmost point post constant head tank 50 that sets up of mouthful edgewise blanking shaping in edge at the lithium cell top cap piece 200 back, carry out blanking shaping back-off hole 54 to the back of lithium cell top cap piece 200, its step shaping sets up for perfecting lithium cell top cap piece 200, utmost point post constant head tank 50 is square structure.
Step S4, in the continuous step-by-step conveying process of the metal strip 100, stamping the annular surface 53 at the upper end of the annular side part 41 to form an annular recess 61 continuously arranged along the annular side wall 51, forming a convex ring 62 at the inner edge of the annular recess 61, wherein the distance between the inner bottom surface of the annular recess 61 and the top surface of the convex ring 62 is L, stamping the lower end of the closed type lower concave part 40 to form a concave part 64, and forming an annular boss according to the inner wall of the concave part 64; the annular recess 61 is mainly formed for positioning the annular convex part on the explosion-proof valve, and the depth of the punched and shaped annular recess 61 meets the product requirement.
Preferably, the step S4 further comprises the molding of the second liquid injection hole 63 and the annular protrusion 65: the metal strip 100 is fed in a continuous stepwise manner by punching the edge of the first pour hole 52 and forming the second pour hole 63, and by punching the edge of the inverted-buckle hole 54 and forming the annular protrusion 65.
In this embodiment, the method further includes an outline chamfer forming step, the metal material belt 100 performs a blanking forming of the bevel chamfer 70 on the edge of the formed lithium battery top cover piece 200 in a continuous stepping conveying process, burrs are formed after the blanking forming of the edge of the lithium battery top cover piece 200 in the step, and the burrs are removed through the blanking forming of the bevel chamfer 70, so that the subsequent assembly work is prevented from being affected by the burrs and the like.
Step S5, in the continuous stepping conveying process of the metal strip 100, the middle part 42 of the closed lower concave part 40 is blanked and removed to form an explosion-proof valve mounting hole 80 and an annular positioning groove 81 located on the end surface of the lower half part of the annular side part 41, the lower half part of the annular side part 41 is used as a flange 201 on the edge of the explosion-proof valve mounting hole 80, the annular positioning groove 81 is mainly used for positioning and fixing an explosion-proof valve protective film, a distance is reserved between the explosion-proof valve and the explosion-proof valve protective film due to the formation of the flange 201, so that a sufficient accommodating space is reserved after the explosion part on the explosion-proof valve is exploded, the air pressure overflowing after the explosion part is exploded is buffered, the lower half part of the annular side part 41 is located on the lower surface of the metal strip 100 for forming, and after the lithium battery top cover 200 is completely formed and blanked, the flange 201 is located on the front surface of the lithium battery top cover 200.
Preferably, still include annotate liquid hole one 52, annotate liquid hole two 63 and utmost point post hole 11 and carry out the shaping step of finishing the blanking, and utmost point post constant head tank two, metal material area 100 is in continuous step-by-step transportation process, utilize annotate liquid hole drift and utmost point post hole drift to annotate liquid hole one 52, annotate liquid hole two 63 and utmost point post hole 11 and carry out the finishing blanking respectively, simultaneously, the punchings of utmost point post hole 11 department of the mouth edge that closes on lithium cell top cover 200 front have continuous setting's utmost point post constant head tank two 82, its step impels to annotate the inner wall of liquid hole one 52, annotate the inner wall of liquid hole two 63 and the inner wall of utmost point post hole 11 and all level and smooth, satisfy the fashioned dimensional requirement and the required precision of product, utmost point post constant head tank two 82 is circular structure.
Step S6, in the continuous stepping conveying process of the metal material belt 100, the opening edge close to the back surface of the lithium battery top cover piece 200 on the pole column hole 11, the opening edge close to the back surface of the lithium battery top cover piece 200 on the explosion-proof valve mounting hole 80 and the opening edge close to the back surface of the lithium battery top cover piece 200 on the liquid injection hole I52 are punched, formed and chamfered, in the step S, the chamfer 83 on the opening edge close to the back surface of the lithium battery top cover piece 200 on the pole column hole 11 and the chamfer 83 on the opening edge close to the back surface of the lithium battery top cover piece 200 on the explosion-proof valve mounting hole 80 are both inclined chamfer angles, the chamfer 83 on the opening edge close to the back surface of the lithium battery top cover piece 200 on the liquid injection hole I52 is an arc chamfer angle, wherein the chamfer is mainly formed and removed by punching, and the subsequent assembly burrs are prevented from being influenced by the burrs and the like.
Finally, in the continuous step-by-step conveying process of the metal material belt 100, the un-punched part between the lithium battery top cover piece 200 and the metal material belt 100 is punched, and blanking is completed.
The above are only preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples, and all technical solutions that fall under the spirit of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A lithium battery top cover plate and an explosion-proof valve mounting hole forming process thereof are characterized by comprising the following steps:
s1, conveying a metal material belt (100) between an upper die and a lower die of a continuous blanking die in a continuous stepping mode towards a blanking direction, and punching a lithium battery top cover sheet (200) and at least one pole column hole (11) in the lithium battery top cover sheet (200) on the metal material belt (100) in the conveying process;
s11, in the continuous stepping conveying process of the metal material belt (100), two oppositely arranged pole column holes (11) and guide holes (12) located at the edge of the metal material belt (100) are punched in a top cover plate punching area on the metal material belt (100);
step S12, in the continuous stepping conveying process of the metal material belt (100), a liquid injection hole mark position, a first trimming hole (20) and a second trimming hole are formed in a blanking area of the top cover plate in a blanking mode, wherein the first trimming hole and the second trimming hole are respectively located at two ends of the blanking area of the top cover plate;
s13, in the continuous stepping conveying process of the metal material belt (100), respectively blanking and forming T-shaped trimming holes (30) at two ends of the trimming hole II in the top cover plate blanking area, wherein the T-shaped trimming holes (30) are communicated with the trimming hole II to form one side edge shape of the lithium battery top cover plate (200) in the top cover plate blanking area, and then entering S14;
step S14, in the continuous stepping conveying process of the metal material belt (100), T-shaped trimming holes (30) are respectively punched at two ends of a trimming hole II between two adjacent top cover plate punching areas, so that the edge shape of a lithium battery top cover plate (200) is formed at two opposite sides in one top cover plate punching area, the lithium battery top cover plate (200) connected with the metal material belt (100) through a connecting body is formed, and the edge shape of one side of the lithium battery top cover plate (200) and the trimming hole II are respectively formed at two opposite sides in the other top cover plate punching area;
s2, in the continuous stepping conveying process of the metal material belt (100), a blanking forming area on a lithium battery top cover piece (200) is subjected to punch forming to form a closed lower concave portion (40), the closed lower concave portion (40) comprises an annular side portion (41) and a middle portion (42) located in an inner hole of the annular side portion (41), a fillet (13) is formed between the lower half portion of the annular side portion (41) and the front face of the lithium battery top cover piece (200), the thickness of the middle portion (42) is smaller than that of the annular side portion (41) under the action of extrusion force of the middle portion (42) in the stamping process, and the height of the closed lower concave portion (40) is H;
s3, in the continuous step-by-step conveying process of the metal strip (100), stamping an annular surface (53) at the upper end of an annular side part (41) and a cavity (43) of a closed type lower concave part (40) so that the annular surface (53) at the upper end of the annular side part (41) sinks to enable the edge of the annular surface to form an annular side wall (51), enabling the height of the closed type lower concave part (40) to be H-X, and enabling the inner wall surface of the annular side part (41) to be perpendicular to the inner plane of the middle part (42);
s4, in the continuous step-by-step conveying process of the metal strip (100), stamping an annular surface (53) at the upper end of an annular side part (41) to form an annular recess (61) which is continuously arranged along an annular side wall (51), forming a convex ring (62) at the inner edge of the annular recess (61), wherein the distance between the inner bottom surface of the annular recess (61) and the top surface of the convex ring (62) is L, stamping the lower end of a closed type lower concave part (40) to form a concave part (64), and forming an annular boss according to the inner wall of the concave part (64);
and S5, blanking and removing the middle part (42) of the closed type lower concave part (40) in the continuous stepping conveying process of the metal strip (100) to form an explosion-proof valve mounting hole (80) and an annular positioning groove (81) located on the end face of the lower half part of the annular side part (41), wherein the lower half part of the annular side part (41) is used as a flange (201) of the edge of the explosion-proof valve mounting hole (80).
2. The forming process of the top cover sheet and the explosion-proof valve mounting hole thereof as claimed in claim 1, wherein the step S3 further comprises forming a first liquid injection hole (52), a first inverted buckle hole (54) and a first pole positioning groove (50): in the continuous stepping conveying process, the metal material belt (100) punches and forms the mark position of the liquid injection hole to form a first liquid injection hole (52), forms and continuously sets a first pole positioning groove (50) on the pole hole (11) close to the edge of the back face of the lithium battery top cover piece (200), and punches and forms a reverse buckling hole (54) on the back face of the lithium battery top cover piece (200).
3. The forming process of the lithium battery top cover plate and the explosion-proof valve mounting hole thereof as claimed in claim 2, further comprising the forming of a second liquid injection hole (63) and an annular protrusion (65) in step S4: in the continuous stepping conveying process of the metal material belt (100), the opening edge of the first liquid injection hole (52) is punched and formed into a second liquid injection hole (63), and the opening edge of the reverse buckling hole (54) is punched and formed into an annular bulge (65).
4. The lithium battery top cover plate and the explosion-proof valve mounting hole forming process thereof as claimed in claim 3, further comprising an outer shape chamfer forming step between the step S4 and the step S5, wherein the metal strip (100) is punched and formed with a chamfer (70) on the edge of the formed lithium battery top cover plate (200) in a continuous step-by-step conveying process.
5. The lithium battery top cover piece and the explosion-proof valve mounting hole forming process thereof as claimed in claim 3, wherein the step S5 further comprises trimming and punching the first liquid injection hole (52), the second liquid injection hole (63) and the post hole (11), and forming the post positioning groove II, wherein the metal material belt (100) is trimmed and punched respectively for the first liquid injection hole (52), the second liquid injection hole (63) and the post hole (11) by using the first liquid injection hole punch and the post hole punch in the continuous step-type conveying process, and meanwhile, the post positioning groove II (82) which is continuously arranged is punched and formed at the position of the opening edge of the post hole (11) close to the front surface of the lithium battery top cover piece (200).
6. The lithium battery top cover plate and the explosion-proof valve mounting hole forming process thereof as claimed in any one of claims 3 to 5,
and the step S6 is further included, in the continuous stepping conveying process, the metal material belt (100) performs punching forming and chamfering (83) on the opening edge close to the back surface of the lithium battery top cover piece (200) on the pole column hole (11), the opening edge close to the back surface of the lithium battery top cover piece (200) on the explosion-proof valve mounting hole (80) and the opening edge close to the back surface of the lithium battery top cover piece (200) on the liquid injection hole I (52).
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| CN202210931992.4A CN114985594B (en) | 2022-08-04 | 2022-08-04 | Lithium battery top cover plate and explosion-proof valve mounting hole forming process thereof |
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Families Citing this family (4)
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| CN115213644A (en) * | 2022-09-19 | 2022-10-21 | 宁波震裕科技股份有限公司 | Integrated battery shell forming process |
| CN115312928B (en) * | 2022-10-09 | 2023-01-13 | 宁波震裕科技股份有限公司 | Round steel shell forming process and battery assembling process of battery |
| CN115318953B (en) * | 2022-10-17 | 2023-02-10 | 宁波震裕科技股份有限公司 | Stamping and integral forming method of top cover plate, battery top cover structure and manufacturing method thereof |
| CN115377574B (en) * | 2022-10-25 | 2023-01-31 | 宁波震裕科技股份有限公司 | Integral forming process of top cover plate and explosion-proof valve |
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