CN113571849A - Lithium battery top cover assembly and secondary battery - Google Patents
Lithium battery top cover assembly and secondary battery Download PDFInfo
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- CN113571849A CN113571849A CN202110805427.9A CN202110805427A CN113571849A CN 113571849 A CN113571849 A CN 113571849A CN 202110805427 A CN202110805427 A CN 202110805427A CN 113571849 A CN113571849 A CN 113571849A
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- top cover
- cover plate
- electrode terminal
- terminal
- injection molding
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 143
- 238000001746 injection moulding Methods 0.000 claims abstract description 91
- 239000000084 colloidal system Substances 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 238000004080 punching Methods 0.000 claims description 15
- 239000003292 glue Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims 2
- 230000037431 insertion Effects 0.000 claims 2
- 230000035515 penetration Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 208000002193 Pain Diseases 0.000 description 3
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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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- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a lithium battery top cover assembly, which comprises: a top cover plate; a first seal and a second seal; a first electrode terminal and a second electrode terminal; a lower insulating support; the first fixing piece and the second fixing piece. A first colloid formed on the first fixing piece penetrates through the terminal injection molding through hole, the sealing piece injection molding through hole and the top cover plate injection molding through hole and is connected with the lower insulating support into a whole, and a first meshing colloid formed on the first fixing piece is embedded into the terminal meshing groove and the top cover plate meshing groove; the second colloid formed on the second fixing piece penetrates through the terminal injection molding through hole, the sealing element injection molding through hole and the top cover plate injection molding through hole and is connected with the lower insulating support into a whole, and the second meshing colloid formed on the second fixing piece is embedded into the terminal meshing groove and the top cover plate meshing groove to form an integrated sealing structure. The invention also discloses an injection molding assembly method of the lithium battery top cover assembly.
Description
Technical Field
The present disclosure relates to a lithium battery top cap assembly, and more particularly, to a lithium battery top cap assembly and a secondary battery.
Background
The development and utilization of secondary batteries are related to the continuous development of new energy technology, and the development and utilization of electric power as clean energy at the present stage is a long-term strategic target.
In the process of assembling and packaging the secondary battery, the traditional packaging cover plate component and the corresponding assembling method have certain defects, the cover plate component is packaged only by means of a simple sealing ring, and the sealing performance of the liquid in the secondary battery is poor.
Meanwhile, the structure and the assembly process of the pole are complex, so that the assembly efficiency of the secondary battery is influenced, and after the pole is fixed on the top cover plate, the pole is often disconnected from the top cover plate due to insufficient fixing force, so that the use reliability of the secondary battery is reduced.
Therefore, a new lithium battery cap assembly and secondary battery are needed.
Disclosure of Invention
In view of the above disadvantages, an object of the present invention is to provide a lithium battery top cover assembly and a secondary battery, which not only improve the sealing performance after a first electrode terminal and a second electrode terminal are assembled on a top cover plate, increase the combination stability between structures, increase the fixing strength, improve the product performance, and improve the product use reliability; moreover, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
The technical scheme adopted by the invention to achieve the aim is as follows:
a lithium battery header assembly, comprising:
the top cover plate is provided with a plurality of top cover plate injection molding through holes and a plurality of top cover plate undercut grooves;
the first sealing element and the second sealing element are arranged on the top cover plate, and a plurality of sealing element injection molding through holes corresponding to the top cover plate injection molding through holes are formed in the first sealing element and the second sealing element respectively;
the first electrode terminal is arranged on the first sealing element, the second electrode terminal is arranged on the second sealing element, a plurality of terminal injection molding through holes corresponding to the sealing element injection molding through holes are respectively formed on the first electrode terminal and the second electrode terminal, and meanwhile, a plurality of terminal flower-biting grooves corresponding to the flower-biting grooves of the top cover plate are respectively formed on the first electrode terminal and the second electrode terminal;
a lower insulating support disposed below the top cover plate;
the first fixing piece is arranged on the top cover plate, a plurality of first colloid formed on the first fixing piece sequentially penetrate through the terminal injection molding through hole of the first electrode terminal, the sealing element injection molding through hole of the first sealing element and the top cover plate injection molding through hole of the top cover plate from top to bottom and are connected with the lower insulating support into a whole, and meanwhile, a plurality of first meshing colloid formed on the first fixing piece are embedded into the terminal meshing groove of the first electrode terminal and the top cover plate meshing groove of the top cover plate;
the second fixing piece is arranged on the top cover plate, a plurality of second colloid formed on the second fixing piece sequentially penetrates through the terminal injection molding through hole of the second electrode terminal, the sealing element injection molding through hole of the second sealing element and the top cover plate injection molding through hole of the top cover plate from top to bottom, and is connected with the lower insulating support into a whole.
As a further improvement of the invention, the undercut groove of the top cover plate and the undercut groove of the terminal are both in an inverted cone structure.
As a further improvement of the invention, the plurality of injection molding through holes of the top cover plate are annularly and uniformly distributed on the top cover plate, and the plurality of undercut grooves of the top cover plate are formed on the upper surface and the lower surface of the top cover plate; the plurality of terminal injection molding through holes are uniformly distributed on the first electrode terminal and the second electrode terminal in an annular mode, and the plurality of terminal undercut grooves are formed in the upper surfaces of the first electrode terminal and the second electrode terminal.
As a further improvement of the present invention, a sealing member through hole is formed in the middle of the first sealing member, a sealing member annular embedding portion located at the periphery of the sealing member through hole is arranged on the lower end surface of the first sealing member in a downward protruding manner, a plurality of first protruding blocks are formed on the outer side edge of the first sealing member, and the sealing member injection molding through hole is formed on the first protruding blocks; the second sealing element is identical in structure with the first sealing element.
As a further improvement of the present invention, a plurality of second protruding blocks are respectively formed on the outer side edges of the first sealing element and the second sealing element, a positioning column is formed on the second protruding blocks, the upper end of the positioning column is embedded into the terminal injection through hole, and the lower end of the positioning column is embedded into the top cover plate injection through hole.
As a further improvement of the present invention, an annular terminal plate is formed on the periphery of the first electrode terminal, a terminal protrusion is convexly arranged on the lower end surface of the first electrode terminal, and a plurality of terminal injection molding via holes and a plurality of terminal undercut grooves on the first electrode terminal are uniformly distributed on the annular terminal plate; the second electrode terminal has the same structure as the first electrode terminal.
As a further improvement of the present invention, two mounting locations for mounting the first electrode terminal and the second electrode terminal are formed on the top cover plate, a terminal lead-out hole for leading out the terminal protrusion is formed on each of the two mounting locations, a top cover plate sinking portion is formed at the periphery of the terminal lead-out hole, the plurality of top cover plate injection molding through holes and the plurality of top cover plate undercut grooves are distributed on the top cover plate sinking portion, the first sealing member and the second sealing member are respectively arranged on the top cover plate sinking portions of the two mounting locations and avoid the plurality of top cover plate undercut grooves, and the sealing member annular embedding portion is embedded in the terminal lead-out hole and clamped between the inner wall of the terminal lead-out hole and the outer wall of the terminal protrusion.
As a further improvement of the invention, two insulation support through holes corresponding to the terminal leading-out holes one by one are formed on the lower insulation support, and a plurality of insulation support special-shaped grooves are formed at the periphery of the insulation support through holes; a plurality of fixing piece special-shaped convex blocks clamped in the insulating support special-shaped grooves are respectively formed on the outer sides of the lower parts of the first fixing piece and the second fixing piece; the first glue bodies are correspondingly connected with the fixing part special-shaped lugs on the first fixing part, and the second glue bodies are correspondingly connected with the fixing part special-shaped lugs on the second fixing part.
As a further improvement of the invention, an explosion-proof valve mounting hole is formed on the top cover plate, an annular mounting groove located at the periphery of the explosion-proof valve mounting hole is formed on the lower end surface of the top cover plate, an explosion-proof valve is arranged in the annular mounting groove, and a protective film is arranged on the explosion-proof valve mounting hole; and an explosion-proof valve protection cover corresponding to the explosion-proof valve is arranged on the lower insulating support.
The injection molding assembly method of the lithium battery top cover component is characterized by comprising the following steps:
(1) punching a plurality of top cover plate straight holes on the top cover plate, and punching a plurality of terminal straight holes on the first electrode terminal and the second electrode terminal respectively; carrying out plane stamping on the top cover plate, the first electrode terminal and the second electrode terminal again to ensure that the surface hole opening of the straight hole is contracted due to secondary stamping to form an inverted conical undercut groove;
(2) punching a plurality of top cover plate injection through holes on a top cover plate, punching a plurality of terminal injection through holes on a first electrode terminal and a second electrode terminal respectively, and punching a plurality of sealing element injection through holes on a first sealing element and a second sealing element respectively;
(3) welding the explosion-proof valve on the bottom surface of the explosion-proof valve mounting hole of the top cover plate;
(4) mounting a first sealing member on a bottom surface of the first electrode terminal, and then mounting the first electrode terminal mounted with the first sealing member on an upper surface of the cap plate; meanwhile, a second sealing member is mounted on the bottom surface of the second electrode terminal, and then the second electrode terminal mounted with the second sealing member is mounted on the upper surface of the cap plate;
(5) assembling the explosion-proof valve on the bottom surface of the top cover plate;
(6) placing the assembled rear top cover assembly on the lower insulating support in a mold, then performing an injection molding process, forming a first fixing piece on the top cover plate and corresponding to the position of the first electrode terminal, sequentially penetrating a terminal injection molding through hole of the first electrode terminal, a sealing piece injection molding through hole of the first sealing piece and a top cover plate injection through hole of the top cover plate from top to bottom by a first colloid formed on the first fixing piece, and connecting the first colloid with the lower insulating support into a whole, and simultaneously embedding a plurality of first meshing colloids formed on the first fixing piece into a terminal meshing groove of the first electrode terminal and a top cover plate meshing groove of the top cover plate; forming a second fixing piece on the top cover plate and corresponding to the position of the second electrode terminal, sequentially penetrating a terminal injection molding through hole of the second electrode terminal, a sealing element injection molding through hole of a second sealing element and the top cover plate injection molding through hole of the top cover plate from top to bottom by a second colloid formed on the second fixing piece, and connecting the second colloid and a lower insulating support into a whole, embedding a plurality of second meshing colloids formed on the second fixing piece into a terminal meshing groove of the second electrode terminal and a top cover plate meshing groove of the top cover plate, and simultaneously, injection molding the explosion-proof valve and the top cover plate into a whole to form an integrated sealing structure;
wherein, the steps (1) and (2) are not in sequence, and the steps (3), (4) and (5) are not in sequence.
The invention has the beneficial effects that:
(1) the lithium battery top cover component provided by the invention has the advantages that the plurality of first colloid formed on the first fixing piece and the plurality of second colloid formed on the second fixing piece penetrate through the injection through hole, meanwhile, the plurality of first meshing colloid formed on the first fixing piece and the plurality of second meshing colloid formed on the second fixing piece are respectively embedded into the meshing grooves, so that the first electrode terminal, the second electrode terminal and the top cover plate are fixedly connected into a whole, and the sealing effect of the first sealing piece and the second sealing piece is combined to form an integrated sealing structure. Therefore, the sealing performance of the first electrode terminal and the second electrode terminal after being assembled on the top cover plate is improved, the combination stability between structures is improved, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved; moreover, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
(2) Through stinging the flower recess with the top deck board and stinging the flower recess to set to the back taper structure, specific do, the top deck board stings the flower recess and stings the flower recess for blind hole bottom diameter is greater than the structural design of head diameter, is favorable to the interlock colloid to imbed after stinging the flower recess, can increase between first mounting and the first electrode terminal, and the pulling force between second mounting and the second electrode terminal to improve the steadiness that each structure combines.
(3) According to the injection molding assembly method of the lithium battery top cover assembly, all the parts are assembled together, and finally, one-time injection molding is carried out through an injection molding process, the first electrode terminal and the second electrode terminal are tightly fixed on the top cover plate through the first fixing piece and the second fixing piece which are formed, and an integrated sealing structure is formed by combining the sealing effect of the first sealing piece and the second sealing piece. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and the leakproofness of first electrode terminal after assembling on the lamina tecti respectively with the second electrode terminal has been improved, has increased the combination stability between the structure, and the fixed dynamics of increase promotes and produces the property ability, improves product reliability in utilization.
(4) According to the secondary battery provided by the invention, the shell, the electrode assembly arranged in the shell and the lithium battery top cover assembly which is arranged on the shell and is electrically connected to the electrode assembly and comprises any one of claims 1 to 9 are arranged, so that the lithium battery top cover assembly covers the opening arranged in the shell, the problem of liquid leakage in the shell of the secondary battery is effectively prevented, the stability and the sealing performance of the secondary battery are improved, and the reliability and the safety of the battery are further improved.
The above is an overview of the technical solutions of the present invention, and the present invention is further described below with reference to the accompanying drawings and the detailed description thereof.
Drawings
FIG. 1 is an exploded view of the first embodiment;
FIG. 2 is a partial exploded assembly view of the first embodiment;
FIG. 3 is a rear view of an exploded view of the first embodiment;
FIG. 4 is a schematic overall structure diagram according to the first embodiment;
FIG. 5 is a cross-sectional view of the first embodiment;
FIG. 6 is an enlarged view of portion A;
FIG. 7 is a schematic view of a second seal according to an embodiment;
FIG. 8 is a schematic structural diagram of a second electrode terminal according to an embodiment;
FIG. 9 is a schematic view of a backside structure of a second electrode terminal according to an embodiment;
FIG. 10 is a sectional view of a second electrode terminal according to the embodiment;
FIG. 11 is a schematic view of a top cover plate according to an embodiment;
FIG. 12 is a schematic view of a first sealing member disposed on the top cover plate according to an embodiment;
FIG. 13 is a schematic diagram illustrating a backside structure of a top cover plate according to an embodiment;
FIG. 14 is an enlarged view of the portion B;
FIG. 15 is a schematic view of a second fastener according to an embodiment;
fig. 16 is a schematic overall structure diagram of the second embodiment.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purposes, the following detailed description of the embodiments of the present invention is provided with the accompanying drawings and the preferred embodiments.
Example one
Referring to fig. 1 to 15, an embodiment of the invention provides a lithium battery top cap assembly, including:
a top cover plate 1, wherein a plurality of top cover plate injection molding through holes 11 and a plurality of top cover plate undercut grooves 12 are formed on the top cover plate 1, as shown in fig. 11 to 14;
a first sealing element 2 and a second sealing element 3, both disposed on the top cover plate 1, wherein a plurality of sealing element injection molding through holes (21,31) corresponding to the top cover plate injection molding through holes 11 are formed on the first sealing element 2 and the second sealing element 3, respectively, as shown in fig. 1 to 3;
a first electrode terminal 4 and a second electrode terminal 5, wherein the first electrode terminal 4 is disposed on the first sealing member 2, the second electrode terminal 5 is disposed on the second sealing member 3, and a plurality of terminal injection molding via holes (41,51) corresponding to the sealing member injection molding via holes (21,31) are respectively formed on the first electrode terminal 4 and the second electrode terminal 5, and a plurality of terminal biting grooves (42, 52) corresponding to the top cover plate biting groove 12 are respectively formed on the first electrode terminal 4 and the second electrode terminal 5, as shown in fig. 1 to 3;
a lower insulating support 6 disposed below the top cover plate 1;
a first fixing member 7 disposed on the top cover plate 1, wherein a plurality of first colloids 71 formed on the first fixing member 7 sequentially penetrate through the terminal injection molding via holes 41 of the first electrode terminals 4, the sealing member injection molding via holes 21 of the first sealing member 2, and the top cover plate injection molding via holes 11 of the top cover plate 1 from top to bottom, and are connected with the lower insulating support 6 into a whole, and meanwhile, a plurality of first meshing colloids 72 formed on the first fixing member 7 are embedded into the terminal meshing grooves 42 of the first electrode terminals 4 and the top cover plate meshing grooves 12 of the top cover plate 1;
the second fixing member 8 is disposed on the top cover plate 1, a plurality of second glue bodies 81 formed on the second fixing member 8 sequentially penetrate through the terminal injection molding via hole 51 of the second electrode terminal 5, the sealing member injection molding via hole 31 of the second sealing member 3 and the top cover plate injection molding via hole 11 of the top cover plate 1 from top to bottom, and are connected with the lower insulating support 6 into a whole, and meanwhile, a plurality of second meshing glue bodies 82 formed on the second fixing member 8 are embedded into the terminal meshing groove 52 of the second electrode terminal 5 and the top cover plate meshing groove 12 of the top cover plate 1, so as to form an integrated sealing structure.
The first sealing member 2 and the second sealing member 3 of the present embodiment not only perform a sealing function, but also perform a function of insulating the first electrode terminal 4 from the top lid plate 1 and the second electrode terminal 5 from the top lid plate 1.
Through adopting the first colloid 71 of several fashioned on first mounting 7, the second colloid 81 of several fashioned on second mounting 8 to run through in the via hole of moulding plastics, simultaneously, imbed respectively in the undercut recess by the first colloid 72 of several fashioned on first mounting 7, several second interlock colloid 82 of fashioned on second mounting 8, realize with first electrode terminal 4, second electrode terminal 5 and lamina tecti 1 fixed connection in an organic whole, form integral type seal structure. Therefore, the sealing performance of the first electrode terminal 4 and the second electrode terminal 5 after being assembled on the top cover plate 1 is improved, the combination stability between structures is improved, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved; moreover, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
In the present embodiment, the shapes of the top cover plate injection molding via hole 11, the seal injection molding via holes (21,31), and the terminal injection molding via holes (41,51) may be circular, square, polygonal, oval, irregular, etc., but are not limited to these shapes.
In the present embodiment, the top cover plate undercut groove 12 and the terminal undercut groove (42, 52) are each of an inverted cone structure. Specifically, the top cover plate undercut groove 12 and the terminal undercut groove (42, 52) are designed in a structure that the diameter of the bottom of the blind hole is larger than that of the head, so that after the undercut colloid is embedded into the undercut groove, the tensile force between the first fixing member 7 and the first electrode terminal 4 and between the second fixing member 8 and the second electrode terminal 5 can be increased, and the stability of combination of the structures is improved.
In the present embodiment, the top cover plate undercut groove 12 and the terminal undercut grooves (42, 52) are each an inverted cone-shaped blind hole structure, and the undercut groove may have a circular shape, a square shape, an oval shape, a triangular shape, a special shape, and the like, but is not limited thereto.
For the position design of each injection molding via hole and undercut groove, in this embodiment, the plurality of injection molding via holes 11 of the top cover plate are uniformly distributed on the top cover plate 1 in a ring shape, and the plurality of undercut grooves 12 of the top cover plate are formed on the upper surface and the lower surface of the top cover plate 1, as shown in fig. 11 to 14, preferably, the number of the injection molding via holes 11 of the top cover plate can be set to 4, and the injection molding via holes and the undercut grooves 12 of the top cover plate on the upper surface of the top cover plate 1 are formed on the same circular ring. As shown in fig. 8 to 9, the plurality of terminal injection molding via holes (41,51) are uniformly distributed on the first electrode terminal 4 and the second electrode terminal 5 in a ring shape, and the plurality of terminal embossed grooves (42, 52) are formed on the upper surfaces of the first electrode terminal 4 and the second electrode terminal 5, preferably, the plurality of terminal injection molding via holes (41,51) and the plurality of terminal embossed grooves (42, 52) are closely distributed on the upper surfaces of the first electrode terminal 4 and the second electrode terminal 5 in a ring shape as a whole. The surface bonding tightness of the first fixing member 7 and the first electrode terminal 4 and the surface bonding tightness of the second fixing member 8 and the second electrode terminal 5 can be further improved by the annular and tightly distributed inverted conical undercut grooves.
As for the specific structure of the first sealing element 2 and the second sealing element 3, as shown in fig. 7, a sealing element through hole 20 is formed in the middle of the first sealing element 2, a sealing element annular embedding part 22 located at the periphery of the sealing element through hole 20 is arranged on the lower end surface of the first sealing element 2 in a downward protruding manner, a plurality of first protruding blocks 23 are formed on the outer side edge of the first sealing element 2, and the sealing element injection molding through hole 21 is formed on the first protruding blocks 23; the second seal 3 is identical in structure to the first seal 2.
In order to further improve the combination stability between the first electrode terminal 4 and the top cover plate 1 and between the second electrode terminal 5 and the top cover plate 1, as shown in fig. 7 to 14, in the present embodiment, a plurality of second protruding blocks 24 are respectively formed on the outer side edges of the first sealing member 2 and the second sealing member 3, a positioning column 25 is formed on the second protruding blocks 24, the upper end of the positioning column 25 is embedded into the terminal injection molding through hole (41,51), and the lower end is embedded into the top cover plate injection molding through hole 11. Carry out accurate location by reference column 25 between to first electrode terminal 4 and lamina tecti 1, and between second electrode terminal 5 and lamina tecti 1, prevent that the terminal from moulding plastics between via hole (41,51), lamina tecti through hole 11 and the sealing member via hole (21,31) of moulding plastics and producing the dislocation to improve the assembly accuracy.
As for the specific structure of the first electrode terminal 4 and the second electrode terminal 5, as shown in fig. 8 to 10, an annular terminal plate 43 is formed on the periphery of the first electrode terminal 4, a terminal protrusion 44 is convexly disposed on the lower end surface of the first electrode terminal 4, and a plurality of terminal injection molding through holes 41 and a plurality of terminal biting grooves 42 on the first electrode terminal 4 are uniformly distributed on the annular terminal plate 43; the second electrode terminal 5 has the same structure as the first electrode terminal 4.
In the present embodiment, the first electrode terminal 4 is a positive electrode post, and the second electrode terminal 5 is a negative electrode post. The shapes of the first electrode terminal 4 and the second electrode terminal 5 may be circular, square, polygonal, elliptical, irregular, etc., but are not limited to these shapes.
In this embodiment, the first electrode terminal 4 is a positive electrode post. The material used was aluminum. The second electrode terminal 5 is a negative electrode post. The cathode pole is made of a copper-aluminum composite integrated material, and is specifically formed by stamping the copper-aluminum composite material. Compared with the traditional mode of combining the aluminum block and the copper block which are well manufactured by adopting a friction welding mode, the copper-aluminum composite material is directly punched, so that the production efficiency can be improved, the equipment cost is reduced, the condition of poor combination is reduced, and the product yield is improved.
As for the specific structure of the top cover plate 1, as shown in fig. 11 to 14, two mounting locations 10 for mounting the first electrode terminal 4 and the second electrode terminal 5 respectively are formed on the top cover plate 1, a terminal lead-out hole 13 for leading out the terminal protrusion 44 is formed on each of the two mounting locations 10, a top cover plate sinking portion 14 is formed at the periphery of the terminal lead-out hole 13, the plurality of top cover plate injection molding through holes 11 and the plurality of top cover plate undercut grooves 12 are distributed on the top cover plate sinking portion 14, the first sealing element 2 and the second sealing element 3 are respectively disposed on the top cover plate sinking portions 14 of the two mounting locations 10 and avoid the plurality of top cover plate undercut grooves 12, as shown in fig. 7, and the sealing element annular embedding portion 22 is embedded in the terminal lead-out hole 13 and is sandwiched between the inner wall of the terminal lead-out hole 13 and the outer wall of the terminal protrusion 44, as shown in fig. 5. Thus, the first seal 2 and the second seal 3 insulate the first electrode terminal 4 from the top lid plate 1 and the second electrode terminal 5 from the top lid plate 1, respectively, and also seal the electrodes.
The plurality of terminal injection molding via holes 41 of the first electrode terminal 4, the plurality of sealing members injection molding via holes 21 of the first sealing member 2, and the plurality of top cover plate injection molding via holes 11 of the top cover plate 1 are arranged in a one-to-one correspondence manner in the vertical direction, so that the plurality of first colloids 71 formed on the first fixing member 7 can sequentially penetrate from top to bottom, and the first electrode terminal 4 is tightly and stably assembled on the top cover plate 1. Similarly, the plurality of terminals of the second electrode terminal 5 are injection-molded through holes 51, the plurality of sealing parts of the second sealing part 3 are injection-molded through holes 31, and the plurality of top cover plates of the top cover plate 1 are injection-molded through holes 11 in a one-to-one correspondence manner in the vertical direction, so that the plurality of second colloids 81 formed on the second fixing part 8 can sequentially penetrate from top to bottom, and the second electrode terminal 5 is tightly and stably assembled on the top cover plate 1.
In the present embodiment, as shown in fig. 1 to 4 and 11 to 14, two insulating support through holes 60 corresponding to the terminal lead-out holes 13 one to one are formed on the lower insulating support 6, and a plurality of insulating support shaped grooves 61 are formed on the periphery of the insulating support through holes 60; a plurality of fixing piece special-shaped convex blocks (73,83) clamped in the insulating support special-shaped groove 61 are respectively formed on the outer sides of the lower parts of the first fixing piece 7 and the second fixing piece 8; the first glue bodies 71 are correspondingly connected with the fixing part profile-shaped bumps 73 on the first fixing part 7, and the second glue bodies 81 are correspondingly connected with the fixing part profile-shaped bumps 83 on the second fixing part 8. When the first fixing member 7 is injection molded, the first colloid 71 and the fixing member special-shaped protrusion 73 are integrally molded, and the fixing member special-shaped protrusion 73 is molded in the insulating support special-shaped groove 61, so that the lower insulating support 6 is connected to the bottom surface of the top cover plate 1 through the first fixing member 7 by the matching connection of the fixing member special-shaped protrusion 73 and the insulating support special-shaped groove 61. Similarly, when the second fixing member 8 is injection molded, the second colloid 81 and the fixing member special-shaped protrusion 83 are integrally molded, and the fixing member special-shaped protrusion 83 is molded in the insulating support special-shaped groove 61, so that the lower insulating support 6 is connected to the bottom surface of the top cover plate 1 through the second fixing member 8 by the matching connection of the fixing member special-shaped protrusion 83 and the insulating support special-shaped groove 61.
In the present embodiment, as shown in fig. 1 to 4, an explosion-proof valve mounting hole 15 is formed on the top cover plate 1, an annular mounting groove 16 located at the periphery of the explosion-proof valve mounting hole 15 is formed on the lower end surface of the top cover plate 1, an explosion-proof valve 9 is disposed in the annular mounting groove 16, and a protective film 91 is disposed on the explosion-proof valve mounting hole 15; an explosion-proof valve protection cover 92 corresponding to the explosion-proof valve 9 is provided on the lower insulating support 6. And the upper surface of the mounting hole of the explosion-proof valve of the top cover plate is also provided with a double-exhaust semicircular groove 93. When the pressure in the battery reaches the explosion-proof valve 9 explosion-starting pressure value, the explosion-proof valve can be directly communicated with the outside through the explosion-proof valve protective cover 92 and the double exhaust semicircular groove 93 and the explosion-proof valve 9, the air is quickly released, and the explosion caused by high pressure in the battery box is prevented.
The embodiment of the invention also provides an injection molding assembly method of the lithium battery top cover assembly, which comprises the following steps:
(1) punching a plurality of top cover plate straight holes on the top cover plate 1, and punching a plurality of terminal straight holes on the first electrode terminal 4 and the second electrode terminal 5 respectively; carrying out plane stamping on the top cover plate 1, the first electrode terminal 4 and the second electrode terminal 5 again, so that the surface hole opening of the straight hole is contracted due to secondary stamping to form an inverted conical undercut groove;
(2) punching a plurality of top cover plate injection through holes 11 on a top cover plate 1, punching a plurality of terminal injection through holes (41,51) on a first electrode terminal 4 and a second electrode terminal 5 respectively, and punching a plurality of sealing element injection through holes (21,31) on a first sealing element 2 and a second sealing element 3 respectively;
(3) welding the explosion-proof valve on the bottom surface of the explosion-proof valve mounting hole of the top cover plate;
(4) taking the first sealing member 2 to be assembled on the bottom surface of the first electrode terminal 4, and then assembling the first electrode terminal 4 assembled with the first sealing member 2 to the upper surface of the cap plate 1; meanwhile, the second sealing member 3 is mounted on the bottom surface of the second electrode terminal 5, and then the second electrode terminal 5 mounted with the second sealing member 3 is mounted on the upper surface of the cap plate 1;
(5) assembling an explosion-proof valve 9 on the bottom surface of the top cover plate 1;
(6) placing the assembled rear top cover assembly on the lower insulating support in a mold, then performing an injection molding process, forming a first fixing member 7 on the top cover plate 1 at a position corresponding to the first electrode terminal 4, sequentially penetrating a first colloid 71 formed on the first fixing member 7 through the terminal injection through hole 41 of the first electrode terminal 4, the sealing member injection through hole 21 of the first sealing member 2 and the top cover plate injection through hole 11 of the top cover plate 1 from top to bottom, and connecting the first colloid with the lower insulating support 6 into a whole, and simultaneously embedding a plurality of first meshing colloids 72 formed on the first fixing member 7 into the terminal meshing grooves 42 of the first electrode terminal 4 and the top cover plate meshing grooves 12 of the top cover plate 1; forming a second fixing piece 8 on the top cover plate 1 and corresponding to the position of the second electrode terminal 5, sequentially penetrating a terminal injection molding through hole 51 of the second electrode terminal 5, a sealing piece injection molding through hole 31 of the second sealing piece 3 and a top cover plate injection through hole 11 of the top cover plate 1 from top to bottom by a second colloid 81 formed on the second fixing piece 8, and connecting the second colloid into a whole with the lower insulating bracket 6, embedding a plurality of second meshing colloids 82 formed on the second fixing piece 8 into a terminal meshing groove 52 of the second electrode terminal 5 and a top cover plate meshing groove 12 of the top cover plate 1, and simultaneously, injection molding the explosion-proof valve 9 and the top cover plate 1 into a whole to form an integrated sealing structure;
wherein, the steps (1) and (2) are not in sequence, and the steps (3), (4) and (5) are not in sequence.
In the embodiment, the first fixing member 7 and the second fixing member 8 are formed by assembling the components together and performing injection molding at one time, so that the first electrode terminal 4 and the second electrode terminal 5 are respectively and tightly fixed on the top cover plate 1 by the first fixing member and the second fixing member to form an integrated sealing structure. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and the leakproofness of first electrode terminal 4 after 5 assembly on lamina tecti 1 with second electrode terminal has been improved, has increased the combination stability between the structure, and the fixed dynamics of increase promotes and produces the property ability, improves product use reliability.
Example two
In the first embodiment, the structure of the roof module is explained. In this embodiment, differences from other embodiments are mainly described, and the same structure is not described repeatedly in this embodiment.
As shown in fig. 16, the main difference between the fifth embodiment and the other four embodiments is that the present embodiment is a secondary battery 10, which comprises a case 101, an electrode assembly 102 disposed in the case 101, and a lithium battery top cover assembly 103 disposed on the case 101 and electrically connected to the electrode assembly 102, and comprises any one of claims 1 to 9. By arranging the lithium battery top cover assembly 103 comprising any one of claims 1 to 7, which is electrically connected to the electrode assembly 102, on the casing 101, the electrode assembly 102 is sealed in the casing 101, so that the sealing performance of the battery is improved, the combination stability between structures is increased, the fixing strength is increased, the performance of the battery is improved, and the use reliability of the battery is improved; moreover, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
As to the specific connection manner between the housing 101 and the lithium battery top cover assembly 103, as shown in fig. 16, an opening 1011 is formed on the housing 101, and the lithium battery top cover assembly 103 covers the opening 1011. Cover in through lithium cell top cap subassembly 103 on the opening 1011, make this battery realize whole sealed, and then improve the leakproofness and the combination stability of this battery.
Preferably, the opening 1011 has a cylindrical structure.
As for the specific structure of the casing 101, the shape material and the like thereof are flexibly selected according to the design requirements of the secondary lithium battery, the shape thereof may be a hexahedron shape or other shapes, and the material may be aluminum, aluminum alloy, plastic and the like.
It should be noted that the shapes of all the components mentioned in the present embodiment are not limited to the shapes shown in the drawings, and the shapes of the components may be changed according to specific needs.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that other structures obtained by using the same or similar technical features as the above-described embodiments of the present invention are within the protection scope of the present invention.
Claims (10)
1. A lithium battery header assembly, comprising:
the top cover plate is provided with a plurality of top cover plate injection molding through holes and a plurality of top cover plate undercut grooves;
the first sealing element and the second sealing element are arranged on the top cover plate, and a plurality of sealing element injection molding through holes corresponding to the top cover plate injection molding through holes are formed in the first sealing element and the second sealing element respectively;
the first electrode terminal is arranged on the first sealing element, the second electrode terminal is arranged on the second sealing element, a plurality of terminal injection molding through holes corresponding to the sealing element injection molding through holes are respectively formed on the first electrode terminal and the second electrode terminal, and meanwhile, a plurality of terminal flower-biting grooves corresponding to the flower-biting grooves of the top cover plate are respectively formed on the first electrode terminal and the second electrode terminal;
a lower insulating support disposed below the top cover plate;
the first fixing piece is arranged on the top cover plate, a plurality of first colloid formed on the first fixing piece sequentially penetrate through the terminal injection molding through hole of the first electrode terminal, the sealing element injection molding through hole of the first sealing element and the top cover plate injection molding through hole of the top cover plate from top to bottom and are connected with the lower insulating support into a whole, and meanwhile, a plurality of first meshing colloid formed on the first fixing piece are embedded into the terminal meshing groove of the first electrode terminal and the top cover plate meshing groove of the top cover plate;
the second fixing piece is arranged on the top cover plate, a plurality of second colloid formed on the second fixing piece sequentially penetrates through the terminal injection molding through hole of the second electrode terminal, the sealing element injection molding through hole of the second sealing element and the top cover plate injection molding through hole of the top cover plate from top to bottom, and is connected with the lower insulating support into a whole.
2. The lithium battery cap assembly of claim 1, wherein the cap plate undercut recess and the terminal undercut recess are each an inverted cone structure.
3. The lithium battery top cap assembly of claim 1, wherein the plurality of top cap plate injection molded vias are evenly distributed annularly on the top cap plate, and the plurality of top cap plate undercut grooves are formed on the upper and lower surfaces of the top cap plate; the plurality of terminal injection molding through holes are uniformly distributed on the first electrode terminal and the second electrode terminal in an annular mode, and the plurality of terminal undercut grooves are formed in the upper surfaces of the first electrode terminal and the second electrode terminal.
4. The lithium battery cap assembly of claim 1, wherein a sealing member penetration hole is formed at a middle portion of the first sealing member, a sealing member annular insertion portion positioned at a periphery of the sealing member penetration hole is formed at a lower end surface of the first sealing member to be downwardly protruded, a plurality of first protrusion blocks are formed at an outer side edge of the first sealing member, and the sealing member injection molding through hole is formed at the first protrusion blocks; the second sealing element is identical in structure with the first sealing element.
5. The lithium battery top cover assembly according to claim 4, wherein a plurality of second protruding blocks are respectively formed on the outer side edges of the first sealing element and the second sealing element, a positioning column is formed on each second protruding block, the upper end of each positioning column is embedded into the terminal injection through hole, and the lower end of each positioning column is embedded into the top cover plate injection through hole.
6. The lithium battery top cover assembly according to claim 4, wherein an annular terminal plate is formed on the periphery of the first electrode terminal, a terminal protrusion is convexly arranged on the lower end face of the first electrode terminal, and a plurality of terminal injection molding through holes and a plurality of terminal undercut grooves on the first electrode terminal are uniformly distributed on the annular terminal plate; the second electrode terminal has the same structure as the first electrode terminal.
7. The lithium battery top cap assembly of claim 6, wherein two mounting locations are formed on the top cap plate for mounting the first electrode terminal and the second electrode terminal, respectively, a terminal lead-out hole for leading out the terminal protrusion is formed on the two mounting locations, respectively, a top cap plate sinking portion is formed at the periphery of the terminal lead-out hole, the plurality of top cap plate injection molding through holes and the plurality of top cap plate undercut grooves are distributed on the top cap plate sinking portion, the first sealing member and the second sealing member are respectively disposed on the top cap plate sinking portions of the two mounting locations and avoid the plurality of top cap plate undercut grooves, and the annular insertion portion of the sealing member is inserted into the terminal lead-out hole and sandwiched between the inner wall of the terminal lead-out hole and the outer wall of the terminal protrusion.
8. The lithium battery top cover assembly according to claim 7, wherein two insulation support through holes corresponding to the terminal lead-out holes one to one are formed in the lower insulation support, and a plurality of insulation support special-shaped grooves are formed at the periphery of the insulation support through holes; a plurality of fixing piece special-shaped convex blocks clamped in the insulating support special-shaped grooves are respectively formed on the outer sides of the lower parts of the first fixing piece and the second fixing piece; the first glue bodies are correspondingly connected with the fixing part special-shaped lugs on the first fixing part, and the second glue bodies are correspondingly connected with the fixing part special-shaped lugs on the second fixing part.
9. The lithium battery top cap assembly of claim 1, wherein an explosion-proof valve mounting hole is formed at the top cap plate, an annular mounting groove is formed at a lower end surface of the top cap plate to be positioned at a periphery of the explosion-proof valve mounting hole, an explosion-proof valve is disposed in the annular mounting groove, and a protective film is disposed on the explosion-proof valve mounting hole; and an explosion-proof valve protection cover corresponding to the explosion-proof valve is arranged on the lower insulating support.
10. The injection molding assembly method for a lithium battery top cover assembly according to any one of claims 1 to 9, comprising the steps of:
(1) punching a plurality of top cover plate straight holes on the top cover plate, and punching a plurality of terminal straight holes on the first electrode terminal and the second electrode terminal respectively; carrying out plane stamping on the top cover plate, the first electrode terminal and the second electrode terminal again to ensure that the surface hole opening of the straight hole is contracted due to secondary stamping to form an inverted conical undercut groove;
(2) punching a plurality of top cover plate injection through holes on a top cover plate, respectively punching a plurality of terminal injection through holes on a first electrode terminal and a second electrode terminal, (respectively punching a plurality of sealing element injection through holes on a first sealing element and a second sealing element);
(3) welding the explosion-proof valve on the bottom surface of the explosion-proof valve mounting hole of the top cover plate;
(4) mounting a first sealing member on a bottom surface of the first electrode terminal, and then mounting the first electrode terminal mounted with the first sealing member on an upper surface of the cap plate; meanwhile, a second sealing member is mounted on the bottom surface of the second electrode terminal, and then the second electrode terminal mounted with the second sealing member is mounted on the upper surface of the cap plate;
(5) placing the assembled rear top cover assembly on the lower insulating support in a mold, then performing an injection molding process, forming a first fixing piece on the top cover plate and corresponding to the position of the first electrode terminal, sequentially penetrating a terminal injection molding through hole of the first electrode terminal, a sealing piece injection molding through hole of the first sealing piece and a top cover plate injection through hole of the top cover plate from top to bottom by a first colloid formed on the first fixing piece, and connecting the first colloid with the lower insulating support into a whole, and simultaneously embedding a plurality of first meshing colloids formed on the first fixing piece into a terminal meshing groove of the first electrode terminal and a top cover plate meshing groove of the top cover plate; forming a second fixing piece on the top cover plate and corresponding to the position of the second electrode terminal, sequentially penetrating a terminal injection molding through hole of the second electrode terminal, a sealing element injection molding through hole of a second sealing element and the top cover plate injection molding through hole of the top cover plate from top to bottom by a second colloid formed on the second fixing piece, and connecting the second colloid and a lower insulating support into a whole, embedding a plurality of second meshing colloids formed on the second fixing piece into a terminal meshing groove of the second electrode terminal and a top cover plate meshing groove of the top cover plate, and simultaneously, injection molding the explosion-proof valve and the top cover plate into a whole to form an integrated sealing structure;
wherein, the steps (1) and (2) are not in sequence, and the steps (3), (4) and (5) are not in sequence.
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| CN2021102142577 | 2021-02-25 | ||
| CN202110214257.7A CN112909447A (en) | 2021-02-25 | 2021-02-25 | Electrode undercut structure of secondary lithium battery top cap |
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| CN202110214257.7A Pending CN112909447A (en) | 2021-02-25 | 2021-02-25 | Electrode undercut structure of secondary lithium battery top cap |
| CN202110805427.9A Pending CN113571849A (en) | 2021-02-25 | 2021-07-16 | Lithium battery top cover assembly and secondary battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114267911A (en) * | 2021-12-17 | 2022-04-01 | 厦门海辰新能源科技有限公司 | Top cap subassembly, battery and energy memory |
| CN114727526A (en) * | 2022-04-08 | 2022-07-08 | 南京元朗电子科技发展有限公司 | A stamping part, controller housing and controller |
| CN115401855A (en) * | 2022-09-01 | 2022-11-29 | 宁波震裕科技股份有限公司 | Punching-riveting injection molding processing method for battery top cover |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113629328A (en) * | 2021-07-16 | 2021-11-09 | 武汉富航精密工业有限公司 | Lithium battery top cover assembly and secondary battery |
| CN115621631B (en) * | 2022-10-28 | 2023-12-15 | 厦门海辰储能科技股份有限公司 | End cover assembly, battery cell, energy storage device and electric equipment |
| SE546722C2 (en) * | 2023-04-23 | 2025-02-11 | Ningbo Zhenyu Tech Co Ltd | Top Cover Injection Molding Structure of Power Battery |
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