CN115320007B - Injection molding pole post forming method and power battery top cover structure - Google Patents
Injection molding pole post forming method and power battery top cover structure Download PDFInfo
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- CN115320007B CN115320007B CN202211250505.4A CN202211250505A CN115320007B CN 115320007 B CN115320007 B CN 115320007B CN 202211250505 A CN202211250505 A CN 202211250505A CN 115320007 B CN115320007 B CN 115320007B
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims description 28
- 239000007924 injection Substances 0.000 claims description 28
- 238000000465 moulding Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000004080 punching Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14467—Joining articles or parts of a single article
-
- 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
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- 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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
- B29C2045/14245—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity using deforming or preforming means outside the mould cavity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3468—Batteries, accumulators or fuel cells
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses an injection molding pole post forming method and a power battery top cover structure, wherein a pole post assembly body is formed in a punching mode, then a pole post and a sealing body are assembled in the pole post assembly body, the pole post assembly body assembled with the pole post and the sealing body is positioned in injection molding equipment for injection molding treatment, so that an injection molding pole post is formed, and at the moment, the injection molding pole post is at least partially arranged in a pole post mounting hole in a penetrating mode and is welded and fixed with a top cover plate; when the injection molding pole is obtained by using the injection molding pole forming method, the material performance of the top cover plate does not need to be considered too much, the design and the manufacturing process of the battery top cover are simplified, the manufacturing efficiency of the battery top cover is improved, and the manufacturing cost is correspondingly reduced.
Description
Technical Field
The invention relates to the technical field of manufacturing of battery accessories for new energy automobiles, in particular to an injection molding pole post forming method and a power battery top cover structure.
Background
The power battery is an important component of the new energy vehicle, and the existing new energy battery mostly adopts a lithium ion battery as the power battery. For a power lithium battery, besides the key components such as the battery cell and the BMS, the battery case structure is also an important factor for the safety of the power lithium battery. Wherein, utmost point post is battery module's component, utmost point post traditional assembly method is earlier with utmost point post assembly to utmost point post downthehole, then through welding, riveting or mould plastics etc. mode and form comparatively complicated connection structure between utmost point post and top cap piece, so that utmost point post rigid coupling is on the top cap piece, but connection structure forms the technology relatively complicacy, and still need consider top cap piece material performance, it is loaded down with trivial details to make battery top cap design and manufacturing process, consequently, there is battery top cap to make fashioned inefficiency, the higher problem of manufacturing cost.
Disclosure of Invention
In order to solve at least one technical defect, the invention provides the following technical scheme:
the injection molding pole forming method comprises the following specific steps:
s1, performing blank forming treatment on a metal blank to form a sheet-shaped blank, and entering the step S2;
s2, molding the sheet-shaped blank to form a pole assembly body, wherein the pole assembly body comprises a sheet-shaped body, a baffle ring convexly arranged on the surface of the sheet-shaped body, a central hole formed in the central position of the sheet-shaped body and a necking part formed on the baffle ring, and the step S3 is entered;
s3, assembling the prefabricated pole and the sealing body into a pole assembling cavity formed by enclosing of the baffle ring, enabling the sealing body to be located between the pole and a step portion below the pole assembling cavity so that the pole and the sheet-shaped body are arranged in an insulating mode, and entering the step S4;
s4, performing secondary necking stamping treatment on the necking part of the baffle ring, bending the necking part inwards again to form an annular limiting body on the inner wall of the baffle ring, wherein the bore diameter of an inner bore of the annular limiting body is smaller than the outer diameter of a pole fixing part of the pole, at least part of a pole part of the pole is exposed outside, injection molding gaps are formed between the inner bore wall of the annular limiting body and the inner wall of the pole assembling cavity and the pole respectively, and the step S5 is entered;
s5, performing injection molding treatment on the baffle ring and the injection molding gap to form an injection molded part; after cooling, the injection molding makes utmost point post rigid coupling on the utmost point post assembly body, and the injection molding to keeping off ring and annular spacing body parcel, the clearance of moulding plastics is filled, and then obtains the utmost point post of moulding plastics.
According to the injection molding pole forming method, in step S2,
s21, performing primary stamping on the sheet-shaped blank to form an assembly blank, wherein the assembly blank comprises a thick plate part, a thick annular part positioned on the surface of the thick plate part and a pre-forming hole positioned in the center of the sheet-shaped body;
step S22, performing stamping processing on the thick annular part of the assembly blank to form a thin annular part, wherein the wall thickness of the thin annular part is smaller than that of the thick annular part, and the height of the thin annular part is larger than that of the thick annular part;
step S23, simultaneously stamping the thin annular part, the thick sheet part and the preformed hole of the assembly blank to form a retaining ring, a sheet body and an expanding hole, wherein the wall thickness of the retaining ring is smaller than that of the thin annular part, the thickness of the sheet body is smaller than that of the thick sheet part, and the inner diameter of the expanding hole is larger than that of the preformed hole;
and S24, simultaneously stamping the baffle ring end part and the expanded hole of the assembly blank to form a central hole and a necking part of the baffle ring end part, wherein the inner diameter of the central hole is larger than that of the expanded hole, and the necking part is in an inward shrinkage state, so that the pole assembly body is formed.
According to the injection molding pole forming method, in step S23, the baffle ring is formed by press molding, and a plurality of positioning concave portions are formed on the outer wall of the baffle ring.
According to the injection molding pole post forming method, in the step S5, when the injection molding part is injection molded on the retaining ring, the injection molding part is formed with the embedding cavity matched with the retaining ring and the annular limiting body, the outer side inner wall of the embedding cavity is formed with the plurality of positioning convex parts, and the positioning convex parts are correspondingly matched with the positioning concave parts so as to enable the injection molding part and the pole post assembly part to be radially limited.
According to the injection molding pole forming method, the pole fixing part of the pole is provided with the first recess and the first bulge; in step S5, a first recess and a first protrusion are formed on the post fixing portion of the post; in step S5, the injection-molded part includes an injection-molded connection portion located in the injection-molded gap, and a second protrusion engaged with the first protrusion and a second recess engaged with the first protrusion are formed on the injection-molded connection portion toward a side wall of the post.
According to the injection molding pole forming method, the outer diameter of the sheet body is larger than that of the baffle ring so as to form the connecting part at the outer edge of the lower end of the baffle ring, the connecting part and the step part below the pole assembling cavity are both arranged in an annular shape, and the thickness of the step part arranged in the annular shape is larger than or smaller than or equal to that of the connecting part arranged in the annular shape.
According to the injection molding method of the post, in step S5, the injection molded part is injection molded while the sealing body is compressed by applying pressure to the post, and the pressure is maintained until the injection molded part is cooled.
According to the injection molding pole forming method, the sealing body comprises the annular sealing sheet and the annular ring formed on the lower side surface of the annular sealing sheet, the lower side surface of the injection molding connecting part and the lower side surface of the pole fixing part are spliced to form the sealing surface, the annular sealing sheet is arranged between the step part and the sealing surface, the lower side surface of the pole fixing part is provided with the limiting part, and the inner wall of the annular sealing sheet is abutted against the limiting part; the outer wall of the annular ring is attached to the inner wall of the central hole.
On the other hand, the power battery top cover structure comprises a top cover plate, and a positive pole post component and a negative pole post component which are arranged on the top cover plate, wherein the positive pole post component or the negative pole post component comprises an injection-molded pole post manufactured by the injection-molded pole post forming method; the positive pole post assembly and the negative pole post assembly are arranged on the same top cover sheet to form an integrated power battery top cover structure, or are respectively arranged on different top cover sheets to form a split type power battery top cover structure.
According to the power battery top cover structure, the top cover sheet is provided with the pole mounting hole and the connecting groove formed at the lower opening edge of the pole mounting hole, and the injection molding pole is at least partially arranged in the pole mounting hole in a penetrating manner; after the connecting part of the injection molding pole is sunk into the connecting groove, the connecting part and the connecting groove are welded and fixed.
Compared with the prior art, the injection molding pole forming method and the power battery top cover structure have the following beneficial effects:
1. when the injection molding pole is obtained by using the injection molding pole forming method, the material performance (such as ductility) of the top cover plate is not required to be considered too much, the design and the manufacturing process of the battery top cover are simplified, the manufacturing efficiency of the battery top cover is improved, and the manufacturing cost is correspondingly reduced.
2. The positioning concave part is matched with the positioning convex part, and the concave part is matched with the convex part, so that after the injection molding part is encapsulated, the anti-torsion performance is improved, the rotation is prevented, and meanwhile, the performance requirement of the product is met.
3. The injection molding piece is subjected to injection molding under the condition of continuously applying pressure to the pole, so that the pole is fixedly connected to the pole assembly body, the compression amount of the sealing body can reach 30%, and the requirement for air tightness is further met.
4. The shaping of annular spacing body prevents to assemble to the utmost point post emergence of utmost point post assembly intracavity and drops.
5. The setting that the inner wall of cyclic annular gasket contradicted with the restriction portion can be so that utmost point post initial assembly when extremely utmost point post assembly intracavity, utmost point post can obtain the position location to the condition that prevents utmost point post off normal before moulding plastics takes place.
6. The injection molding pole obtained by the injection molding pole forming method can be fixedly connected with the pole on the top cover sheet only in a welding mode, so that the modular assembly of the battery top cover can be realized, and the manufacturing efficiency of the battery top cover is improved.
Drawings
Fig. 1 is a layout schematic diagram (one) of a forming method for punch forming of a pole assembly body;
FIG. 2 is a schematic structural view of a pole assembly;
fig. 3 is a schematic layout diagram of a forming method for punch forming of the pole assembly body (ii);
fig. 4 is a schematic structural view of the terminal and the sealing body assembled into the terminal assembly;
fig. 5 is a schematic structural view of a post after injection molding of a post assembly assembled with a post and a sealing body;
FIG. 6 is a schematic structural view of an assembled injection molded pole;
fig. 7 is an exploded view of the injection molded pole (one);
fig. 8 is an exploded schematic view (two) of the injection molded pole;
FIG. 9 is a schematic diagram of the overall structure of the top cover structure of the power battery;
FIG. 10 is a cross-sectional view of a power cell top cover structure;
FIG. 11 is a bottom schematic view of a top cover structure of a power cell;
FIG. 12 is a schematic view of a split battery top cap configuration;
FIG. 13 is a cross-sectional view of a positive top cover sheet construction;
fig. 14 is a cross-sectional view of a negative top cover sheet structure;
fig. 15 is a bottom structure diagram of a split battery top cover.
In the figure: a first forming station 1, a sheet-shaped blank 10;
a second forming station 2, an assembly blank 20, a thick plate part 21, a thick annular part 22 and a pre-forming hole 23;
a third forming station 3, a thin annular portion 30;
a fourth forming station 4, a sheet body 41, a connecting part 411, a baffle ring 42, an expanding hole 43, a necking part 44, a central hole 45, a positioning concave part 46, an annular limiting body 47, an injection molding gap 48 and a step part 49;
a fifth molding station 5, a pole assembly 50;
the seal body 6, the annular seal piece 61, the annular ring 62;
the pole 7, the pole part 71, the pole fixing part 72, the first recess 721, the first projection 722, and the restriction part 73;
the injection molding part 8, the embedding cavity 81, the injection molding connecting part 82, the positioning convex part 83, the second recess 84, the second protrusion 85 and the sealing surface 86;
the top cover plate 9, the pole mounting hole 91, the connecting groove 911, the liquid injection port 92 and the explosion-proof valve hole 93;
the negative electrode pole assembly comprises a positive electrode pole assembly 100, a negative electrode pole assembly 200, an injection-molded pole 101, lower plastic 300, a through hole 301, a liquid injection hole 302, an explosion-proof valve sheet 303, a vent hole 304 and a metal blank 400.
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.
The first embodiment is as follows:
as shown in fig. 1-8, the injection molding pole forming method described in the present embodiment employs a punching apparatus and an injection molding apparatus, and the punching apparatus includes a first forming station 1 for forming a sheet-shaped blank 10, a second forming station 2 for forming an assembled blank 20, a third forming station 3 for forming a thin annular portion 30, a fourth forming station 4 for forming a retaining ring 42, a sheet-shaped body 41 and an enlarged hole 43, and a fifth forming station 5 for forming a central hole 45 and a reduced portion 44 at the end of the retaining ring 42; wherein, stamping equipment still can adopt cold stamping equipment (being the cold heading machine), so stamping equipment and injection moulding equipment under the work of mutually supporting, the utmost point post 101 is moulded plastics in the shaping, and concrete step is as follows:
step S1, performing blank forming treatment on the metal blank 400 to punch and form a sheet-shaped blank 10, and entering step S2; the metal blank 400 is an aluminum wire or rod, and thus, after the aluminum wire or rod is placed in a stamping device, the end portion thereof is blanked, thereby forming the sheet-shaped blank 10.
Step S2, performing a press forming process on the sheet-shaped blank 10, and performing steps S21 to S24 to form a post assembly 50, where the post assembly 50 includes a sheet-shaped body 41, a stopper ring 42 protruding from the surface of the sheet-shaped body 41, a central hole 45 formed in the center of the sheet-shaped body 41, and a necking portion 44 formed on the stopper ring 42, and the process proceeds to step S3; here, the throat portion 44 is only an initial throat, and generally, a profile die in a punching apparatus performs punching, and at this time, the section of the throat portion 44 is in an inwardly inclined state.
Specifically, step S21, the sheet-shaped blank 10 is preliminarily stamped to form the assembly blank 20, and the assembly blank 20 includes the thick plate portion 21, the thick ring portion 22 on the surface of the thick plate portion 21, and the preformed hole 23 in the center of the sheet-shaped body 41; the sheet-shaped blank 10 is stamped by a profiling die of a second forming station 2 in the stamping equipment to form a thick sheet part 21 and a thick annular part 22, and the forming step is prepared for forming the retaining ring 42 and the sheet-shaped body 41 in the later period in advance, and the thickness and the height of the retaining ring 42 after forming can meet the requirements by the thick sheet part 21 and the thick annular part 22.
Step S22, performing stamping processing on the thick annular part 22 of the assembly blank 20 to form a thin annular part 30, wherein the wall thickness of the thin annular part 30 is smaller than that of the thick annular part 22, and the height of the thin annular part 30 is larger than that of the thick annular part 22; wherein, the profile modeling mould of third shaping station 3 in the stamping equipment carries out the punching press to sheet-like blank 10, and then makes thin annular portion 30 shaping to the height and the thickness that the thin annular portion 30 shaping of this department made fender ring 42 obtain preliminary shaping, for thickness and the fender ring 42 that highly satisfies the requirement prepare in advance, make the fender ring 42 structure after the shaping more reliable and more stable.
Step S23, simultaneously stamping the thin annular part 30, the thick plate part 21 and the preformed hole 23 of the assembly blank 20 to form a retaining ring 42, a sheet body 41 and an expanding hole 43, wherein the wall thickness of the retaining ring 42 is smaller than that of the thin annular part 30, the thickness of the sheet body 41 is smaller than that of the thick plate part 21, and the inner diameter of the expanding hole 43 is larger than that of the preformed hole 23; the thick portion 21, the thin annular portion 30 and the preformed hole 23 are pressed by a profiling die of the fourth forming station 4 in the punching device, so that the thick portion 21 and the thin annular portion 30 are thinned, the height of the thin annular portion 30 is correspondingly increased to form a retaining ring 42, the outer diameter of the thinned thick portion 21 is increased to form a thin sheet, and at the moment, a blanking die capable of punching the shape of the sheet-shaped body 41 and the shape of the expanded hole 43 in the profiling die is used for blanking and removing redundant excess materials on the thin sheet to form the sheet-shaped body 41 and the expanded hole 43.
In this embodiment, the retainer ring 42 is press-molded, and a plurality of positioning recesses 46 are formed in the outer wall of the retainer ring 42, and the positioning recesses 46 are press-molded by a copying die of the fourth molding station 4.
Step S24, simultaneously stamping the end part of the baffle ring 42 of the assembly blank 20 and the expanding hole 43 to form a central hole 45 and a necking part 44 at the end part of the baffle ring 42, wherein the inner diameter of the central hole 45 is greater than that of the expanding hole 43, and the necking part 44 is in an inward contraction state, so as to form the pole assembly body 50; the part between the inner wall of the enlarged hole 43 and the thin annular part 30 can be locally blanked by a profiling die of a fifth forming station 5 in the stamping equipment, so that the part between the inner wall of the enlarged hole 43 and the thin annular part 30 is locally removed, the enlarged hole 43 is further enlarged, meanwhile, the end part of the baffle ring 42 of the profiling die is stamped to form a necking part 44 at the end part of the baffle ring 42, and the necking part 44 is located at the port position of the baffle ring 42.
Step S3, assembling the prefabricated pole 7 and the sealing body 6 into a pole assembling cavity formed by enclosing the baffle ring 42, wherein the sealing body 6 is positioned between the pole 7 and a step part 49 below the pole assembling cavity so that the pole 7 and the sheet-shaped body 41 are arranged in an insulating manner, and then, the step S4 is carried out; wherein, this step can be carried out the assembly utmost point post 7 and the seal 6 under the line, can adopt manual assembly.
Step S4, performing secondary necking punching treatment on the necking part 44 of the baffle ring 42, so that the necking part 44 is bent inwards again to form an annular limiting body 47 on the inner wall of the baffle ring 42, the bore diameter of an inner bore of the annular limiting body 47 is smaller than the outer diameter of the pole fixing part 72 of the pole 7, at least part of the pole part 71 of the pole 7 is exposed to the outside, and injection gaps 48 are formed between the inner bore wall of the annular limiting body 47 and the inner wall of the pole assembling cavity and the pole 7 respectively, and the step S5 is carried out; this step is mainly to being equipped with seal 6 and utmost point post assembly body 50 of utmost point post 7 and does the pre-compaction processing, and the pre-compaction processing can be that the utmost point post assembly body 50 that is equipped with seal 6 and utmost point post 7 is fixed a position to stamping equipment on, then carry out the pre-compaction to throat portion 44, in order to form annular spacing body 47, and annular spacing body 47 cross-section is horizontal state, and the external diameter of sheet body 41 is greater than the external diameter that keeps off ring 42, in order to form connecting portion 411 at the lower extreme outward flange that keeps off ring 42, step portion 49 below connecting portion 411 and utmost point post assembly chamber all is the annular setting, connecting portion 411 is as and sets up with top cap piece 9 welded fastening, step portion 49 thickness that the annular set up is greater than or less than or equal to the connecting portion 411 thickness that the annular set up, consequently annular spacing body 47 is located connecting portion 411 top, thereby avoid being equipped with seal 6 and utmost point post assembly body 50 of utmost point post 7 in sending into injection moulding equipment process, utmost point post 7 falls out from the assembly chamber.
S5, positioning the pole post assembly 50 assembled with the sealing body 6 and the pole post 7 into an injection mold of injection molding equipment, and then performing injection molding treatment on the baffle ring 42 and the injection molding gap 48 to form an injection molded part 8; after cooling, the injection-molded part 8 fixedly connects the pole 7 to the pole assembly body 50, the injection-molded part 8 wraps the baffle ring 42 and the annular limiting body 47, the injection-molded clearance 48 is filled, and then the injection-molded pole 101 is obtained, and the injection-molded part 8 also fills the injection-molded clearance 48; in the injection molding process, pressure is applied to the pole post 7 so that the injection molding part 8 is molded under the condition that the sealing body 6 is compressed, and the pressure is kept until the injection molding part 8 is cooled, so that the sealing body 6 can reach 30% of compression amount after the pole post 7 is fixedly connected to the pole assembly body 50, and further the air tightness requirement is met. Wherein, the post 101 of moulding plastics preferably adopts the post 101 of moulding plastics of circular structure, also can adopt square structure certainly, and the injection molding 8 is made by the PPS material.
In some preferred embodiments, when the injection-molded part 8 is injection-molded on the retaining ring 42, the injection-molded part 8 is formed with an embedded cavity 81 matched with the retaining ring 42 and the annular limiting body 47, and the outer side inner wall of the embedded cavity 81 is formed with a plurality of positioning convex parts 83, the positioning convex parts 83 are correspondingly matched with the positioning concave parts 46, so that the injection-molded part 8 and the post 7 assembly are radially limited, the anti-torsion performance between the injection-molded part 8 and the post 7 is improved, the number of the positioning convex parts 83 and the positioning concave die can be four, and the cross section of the embedded cavity 81 is in an L shape.
In this embodiment, the pole fixing portion 72 of the pole 7 is formed with a first recess 721 and a first projection 722; in step S5, the injection-molded part 8 includes the injection-molded connecting portion 82 located in the injection-molded gap 48, a second protrusion 85 that is engaged with the first recess 721 and a second recess 84 that is engaged with the first protrusion 722 are formed on the injection-molded connecting portion 82, and a side wall facing the pole 7 is formed with the second protrusion 85, wherein the first protrusion 722 is fixed in the second recess 84, and the second protrusion 85 is fixed in the first recess 721, so that the injection-molded part 8 and the pole 7 assembly are further radially limited to enhance the torsion resistance.
In this embodiment, the sealing body 6 includes an annular sealing sheet 61 and an annular ring 62 formed on the lower side of the annular sealing sheet 61, the lower side of the injection molding connecting portion 82 and the lower side of the pole fixing portion 72 are spliced to form a sealing surface 86, the annular sealing sheet 61 is disposed between the step portion 49 and the sealing surface 86, the lower side of the pole fixing portion 72 is formed with a limiting portion 73, and the inner wall of the annular sealing sheet 61 is abutted against the limiting portion 73; the outer wall of the annular ring 62 is attached to the inner wall of the central hole 45, the annular ring 62 and the annular sealing sheet 61 are combined into the sealing body 6 of the integrated structure, the sealing body 6 is made of fluororubber, and the sealing effect can be reliably achieved through the arrangement.
The second embodiment:
as shown in fig. 9-11, the top cap structure of the power battery described in this embodiment includes a top cap 9, and a positive electrode post assembly 100 and a negative electrode post assembly 200 disposed on the top cap 9, where the positive electrode post assembly 100 or the negative electrode post assembly 200 includes an injection molded post 101 manufactured by the injection molded post forming method described in the first embodiment; the positive pole post assembly 100 and the negative pole post assembly 200 are arranged on the same top cover plate 9 to form an integrated power battery top cover structure, wherein a post mounting hole 91 and a connecting groove 911 formed at the lower opening edge of the post mounting hole 91 are formed in the top cover plate 9, and the injection molding post 101 is at least partially arranged in the post mounting hole 91 in a penetrating manner; after the connecting part 411 of the injection molding pole 101 sinks into the connecting groove 911, the two are welded and fixed; the connecting slot 911 is also annularly disposed and matches with the annularly disposed connecting portion 411.
In this embodiment, the post 7 in the injection molding post 101 is made of aluminum, and the post 7 in the injection molding post 101 can be made of copper-aluminum alloy, so the post 7 in the positive post assembly 100 is an aluminum post 7, and the post 7 in the negative post assembly 200 is a copper-aluminum alloy post 7.
In this embodiment, an explosion-proof valve hole 93 and a liquid injection port 92 are formed in the top cover plate 9, an explosion-proof valve plate 303 is disposed in the explosion-proof valve hole 93, the explosion-proof valve plate 303 is located in the explosion-proof valve hole 93, and the explosion-proof valve plate 303 is welded and fixed to the explosion-proof valve hole 93 of the top cover plate 9, or the explosion-proof valve plate 303 and the top cover plate 9 are of an integrated structure.
In this embodiment, a lower plastic 300 is fixed to the lower surface of the top cover 9 by heat fusion or the like, and the lower plastic 300 is formed with a through hole 301 corresponding to the position of the pole mounting hole 91, a liquid injection hole 302 corresponding to the position of the liquid injection port 92, and a vent hole 304 corresponding to the position of the explosion-proof valve hole 93.
Example three:
as shown in fig. 12-15, the top cover structure of the power battery described in this embodiment has the same general structure as the embodiment, but the difference is that the top cover sheet 9 is a split structure, that is, includes a positive top cover sheet and a negative top cover sheet, the positive and negative pole post assemblies are respectively disposed on the positive and negative top cover sheets, the liquid injection port 92 is disposed on the positive top cover sheet, and the explosion-proof valve hole 93 is disposed on the negative top cover sheet, so as to form the split top cover structure of the power battery.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection 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 (10)
1. The method for molding the injection molding pole is characterized by comprising the following specific steps of:
s1, performing blank forming treatment on a metal blank (400) to form a sheet-shaped blank (10), and entering the step S2;
s2, shaping the sheet-shaped blank (10) to form a pole assembly (50), wherein the pole assembly (50) comprises a sheet-shaped body (41), a baffle ring (42) convexly arranged on the surface of the sheet-shaped body (41), a central hole (45) formed in the central position of the sheet-shaped body (41) and a necking part (44) formed on the baffle ring (42), and the step S3 is carried out;
s3, assembling the prefabricated pole (7) and the sealing body (6) into a pole assembling cavity formed by enclosing of the baffle ring (42), wherein the sealing body (6) is located between the pole (7) and a step part (49) below the pole assembling cavity, so that the pole (7) and the sheet-shaped body (41) are arranged in an insulating mode, and then the step S4 is carried out;
s4, carrying out secondary necking stamping treatment on the necking part (44) of the baffle ring (42), bending the necking part (44) inwards again to form an annular limiting body (47) on the inner wall of the baffle ring (42), wherein the bore diameter of an inner bore of the annular limiting body (47) is smaller than the outer diameter of a pole fixing part (72) of the pole (7), at least part of a pole part (71) of the pole (7) is exposed to the outside, and an injection molding gap (48) is formed between the inner bore wall of the annular limiting body (47) and the inner wall of the pole assembling cavity and the pole (7) respectively, and then entering the step S5;
s5, performing injection molding treatment on the baffle ring (42) and the injection molding gap (48) to form an injection molded part (8); after cooling, the injection molding piece (8) enables the pole (7) to be fixedly connected to the pole assembly body (50), the injection molding piece (8) wraps the baffle ring (42) and the annular limiting body (47), the injection molding gap (48) is filled, and then the injection molding pole (101) is obtained.
2. The injection molding pole post forming method according to claim 1, wherein in step S2,
step S21, performing primary stamping on the sheet-shaped blank (10) to form an assembly blank (20), wherein the assembly blank (20) comprises a thick plate part (21), a thick annular part (22) positioned on the surface of the thick plate part (21) and a preformed hole (23) positioned in the center of a sheet-shaped body (41);
s22, stamping a thick annular part (22) of the assembly blank (20) to form a thin annular part (30), wherein the wall thickness of the thin annular part (30) is smaller than that of the thick annular part (22), and the height of the thin annular part (30) is larger than that of the thick annular part (22);
step S23, simultaneously stamping the thin annular part (30), the thick plate part (21) and the preformed hole (23) of the assembly blank (20) to form a retaining ring (42), a sheet body (41) and an expanding hole (43), wherein the wall thickness of the retaining ring (42) is smaller than that of the thin annular part (30), the thickness of the sheet body (41) is smaller than that of the thick plate part (21), and the inner diameter of the expanding hole (43) is larger than that of the preformed hole (23);
and S24, simultaneously stamping the end part of the baffle ring (42) and the expanded hole (43) of the assembly blank (20) to form a central hole (45) and a necking part (44) at the end part of the baffle ring (42), wherein the inner diameter of the central hole (45) is greater than that of the expanded hole (43), and the necking part (44) is in an inward shrinkage state, so that the pole assembly body (50) is formed.
3. The injection molding pole forming method according to claim 2, wherein in step S23, the baffle ring (42) is press-formed, and the outer wall of the baffle ring (42) is formed with a plurality of positioning recesses (46).
4. The injection molding pole forming method according to claim 3, wherein in the step S5, the injection molding part (8) is injection molded on the baffle ring (42), the injection molding part (8) is provided with an embedded cavity (81) matched with the baffle ring (42) and the annular limiting body (47), the inner wall of the outer side of the embedded cavity (81) is provided with a plurality of positioning convex parts (83), and the positioning convex parts (83) are correspondingly matched with the positioning concave parts (46) so as to radially limit the assembly part of the injection molding part (8) and the pole (7).
5. An injection molding pole forming method according to claim 4, characterized in that the pole fixing part (72) of the pole (7) is formed with a first recess (721) and a first protrusion (722); in step S5, the injection molding part (8) comprises an injection molding connecting part (82) located in the injection molding gap (48), and a second protrusion (85) matched with the first recess (721) and a second recess (84) matched with the first protrusion (722) are molded on the injection molding connecting part (82) and face one side wall of the pole (7).
6. The injection molding pole forming method according to claim 5, wherein the outer diameter of the sheet body (41) is larger than that of the baffle ring (42) to form a connecting part (411) at the outer edge of the lower end of the baffle ring (42), the connecting part (411) and a step part (49) below the pole assembling cavity are both annularly arranged, and the thickness of the annularly arranged step part (49) is larger than or smaller than or equal to that of the annularly arranged connecting part (411).
7. An injection pole molding method according to claim 1, characterized in that in step S5, the injection molded part (8) is injection molded with the sealing body (6) compressed by applying pressure to the pole (7), and the pressure is maintained until the injection molded part (8) cools.
8. An injection molding pole forming method according to claim 6, wherein the sealing body (6) comprises an annular sealing piece (61) and an annular ring (62) formed on the lower side of the annular sealing piece (61), the lower side of the injection molding connecting part (82) is spliced with the lower side of the pole fixing part (72) to form a sealing surface (86), the annular sealing piece (61) is arranged between the stepped part (49) and the sealing surface (86), the lower side of the pole fixing part (72) is formed with a limiting part (73), and the inner wall of the annular sealing piece (61) is abutted against the limiting part (73); the outer wall of the annular ring (62) is attached to the inner wall of the central hole (45).
9. A power battery top cover structure, comprising a top cover plate (9), and a positive electrode pole assembly (100) and a negative electrode pole assembly (200) arranged on the top cover plate (9), characterized in that the positive electrode pole assembly (100) or the negative electrode pole assembly (200) comprises an injection molded pole (101) manufactured by the injection molded pole molding method according to any one of claims 1 to 8;
the positive pole post assembly (100) and the negative pole post assembly (200) are arranged on the same top cover plate (9) to form an integrated power battery top cover structure, or are respectively arranged on different top cover plates (9) to form a split power battery top cover structure.
10. The top cover structure of the power battery according to claim 9, wherein the top cover sheet (9) is formed with a pole mounting hole (91) and a connecting groove (911) formed at the lower edge of the pole mounting hole (91), and the injection molded pole (101) is at least partially inserted into the pole mounting hole (91); after the connecting part (411) of the injection molding pole (101) falls into the connecting groove (911), the two are welded and fixed.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250505.4A CN115320007B (en) | 2022-10-13 | 2022-10-13 | Injection molding pole post forming method and power battery top cover structure |
| SE2330180A SE2330180A1 (en) | 2022-10-13 | 2023-04-24 | Power battery top cover structure |
| NO20230456A NO20230456A1 (en) | 2022-10-13 | 2023-04-26 | Power battery top cover structure |
| JP2023073553A JP2024058552A (en) | 2022-10-13 | 2023-04-27 | Power battery top cover structure |
| GB2306397.7A GB2623391A (en) | 2022-10-13 | 2023-04-28 | Power battery top cover structure |
| FR2304332A FR3141001A1 (en) | 2022-10-13 | 2023-04-28 | Traction battery top cover structure |
| US18/308,955 US20240128560A1 (en) | 2022-10-13 | 2023-04-28 | Power battery top cover structure |
| DE102023111348.8A DE102023111348A1 (en) | 2022-10-13 | 2023-05-03 | Power battery top cover structure |
| MX2023005392A MX2023005392A (en) | 2022-10-13 | 2023-05-08 | Power battery top cover structure. |
| HU2300165A HUP2300165A1 (en) | 2022-10-13 | 2023-05-16 | Power battery top cover structure |
| KR1020230063725A KR20240051803A (en) | 2022-10-13 | 2023-05-17 | Power battery top cover structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250505.4A CN115320007B (en) | 2022-10-13 | 2022-10-13 | Injection molding pole post forming method and power battery top cover structure |
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| Publication Number | Publication Date |
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| CN115320007A CN115320007A (en) | 2022-11-11 |
| CN115320007B true CN115320007B (en) | 2023-02-10 |
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| CN202211250505.4A Active CN115320007B (en) | 2022-10-13 | 2022-10-13 | Injection molding pole post forming method and power battery top cover structure |
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| CN118024492B (en) * | 2024-04-12 | 2024-08-13 | 珠海格力精密模具有限公司 | Device and method for processing battery top cover assembly and battery top cover assembly |
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