CN112736340B - Injection molding assembly method of secondary battery top cover assembly and top cover assembly - Google Patents
Injection molding assembly method of secondary battery top cover assembly and top cover assembly Download PDFInfo
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- CN112736340B CN112736340B CN202011612928.7A CN202011612928A CN112736340B CN 112736340 B CN112736340 B CN 112736340B CN 202011612928 A CN202011612928 A CN 202011612928A CN 112736340 B CN112736340 B CN 112736340B
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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
- B29C45/14467—Joining articles or parts of a single article
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention discloses an injection molding assembly method of a secondary battery top cover assembly, which comprises the following steps: (1) preparing each component; (2) mounting the lower insulating support to the top cover plate; (3) Assembling the first sealing member, the first electrode terminal, the second sealing member, and the second electrode terminal to the top cover plate; (4) assembling the explosion-proof structure on the top cover plate; (5) Placing the first electrode terminal, the first sealing piece and the top cover plate into a mold, and injecting and molding the first colloid of the formed first fixing piece; the second colloid of the second fixing piece penetrates through the second electrode terminal, the second sealing piece and the top cover plate; the explosion-proof structure and the top cover plate are injection molded into a whole; (6) The first connecting sheet and the second connecting sheet are respectively assembled on the bottom surfaces of the first electrode terminal and the second electrode terminal, and are fixedly connected by spot welding to form an integrated sealing structure. The invention also discloses a secondary battery top cover assembly obtained by implementing the injection molding assembly method.
Description
Technical Field
The invention relates to the field of secondary batteries, in particular to an injection molding assembly method of a secondary battery top cover assembly and the top cover assembly.
Background
New energy automobiles are widely popularized in China and even in the world, but the new energy automobiles need to completely replace fuel automobiles and are in need of improvement. For example, the driving distance of the automobile is small, the cost of the battery pack is high, and the problems of reliability of the battery pack and the like need to be further solved. Based on the above-mentioned problems, there is a higher demand for the power battery, which is a core part of the electric vehicle, for example, a higher energy density, lower cost, etc. of the power battery are required.
At present, a square hard shell structure is commonly adopted in a power battery, a power battery shell comprises a shell body and a top cover assembly, the power battery shell provides a closed space for accommodating an electrode assembly and electrolyte, and electric energy of the electrode assembly is led out of the closed space through a pole column of the top cover assembly.
In the existing top cap assembly, the top cap plate is a metal plate and is provided with a through hole, the pole is divided into a base body portion and an extension portion, and the cross-sectional area of the base body portion is larger than the aperture of the through hole. During assembly, the base body part is positioned below the top cover plate (namely inside the shell), and after the extension part passes through the through hole, the extension part is fixed by using a snap spring or in a riveting mode, so that the pole is fixed on the top cover plate. Since the base body is located inside the case, the space utilization inside the case is reduced, thereby reducing the energy density of the power battery.
Because the structure of the pole and the assembly process are complex, the assembly efficiency of the secondary battery can be affected, and after the pole is fixed on the top cover plate, the phenomenon that the pole is disconnected with the top cover plate due to insufficient fixing force is often caused, so that the use reliability of the secondary battery is reduced.
Accordingly, there is a need for a new injection molding assembly method of a top cap assembly of a secondary battery and a top cap assembly.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention aims to provide an injection molding assembly method of a top cap assembly of a secondary battery and the top cap assembly, which not only greatly simplify the assembly process, improve the assembly efficiency, and reduce the production cost; and improved the leakproofness after first electrode terminal, second electrode terminal and explosion-proof structure assemble respectively on the lamina tecti, increased the bonding stability between the structure, increased fixed dynamics, promoted product performance, improved product reliability in use.
The technical scheme adopted by the invention for achieving the purpose is as follows:
a method of injection molding a top cap assembly of a secondary battery, comprising the steps of:
(1) The following components were prepared: the device comprises a top cover plate, a first electrode terminal, a second electrode terminal, a first sealing piece, a second sealing piece, an explosion-proof structure, a lower insulating bracket, a first connecting piece and a second connecting piece;
(2) Assembling a lower insulating bracket on the bottom surface of the top cover plate;
(3) Fitting a first sealing member to the bottom surface of the first electrode terminal, and then, fitting the first electrode terminal fitted with the first sealing member to the 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 top cap plate;
(4) Assembling an explosion-proof structure on the bottom surface of the top cover plate;
(5) After assembly, the whole body is put into a mould, then an injection molding process is carried out, a first fixing piece is formed on the top cover plate and corresponds to the first electrode terminal, and a first colloid formed on the first fixing piece sequentially penetrates through the first electrode terminal, the first sealing piece and the top cover plate from top to bottom and is connected with the lower insulating bracket into a whole; forming a second fixing piece on the top cover plate and corresponding to the second electrode terminal, wherein a second colloid formed on the second fixing piece sequentially penetrates through the second electrode terminal, the second sealing piece and the top cover plate from top to bottom and is connected with the lower insulating bracket into a whole; simultaneously, the explosion-proof structure and the top cover plate are injection molded into a whole;
(6) Assembling the first connecting sheet on the bottom surface of the first electrode terminal, assembling the second connecting sheet on the bottom surface of the second electrode terminal, and then performing spot welding connection and fixation to form an integrated sealing structure;
Wherein, the steps (2), (3) and (4) are not in sequence.
As a further improvement of the present invention, in the step (1), the explosion-proof structure includes an explosion-proof valve, a third seal member, and a metal member; in the step (4), the explosion-proof valve is assembled on the bottom surface of the top cover plate, the third sealing element is assembled on the bottom surface of the explosion-proof valve, and the metal element is assembled on the bottom surface of the third sealing element; in the step (5), a third fixing piece is formed on the top cover plate through an injection molding process, and a third colloid formed on the third fixing piece sequentially penetrates through the metal piece, the third sealing piece, the explosion-proof valve and the top cover plate from bottom to top and is connected with the lower insulating support into a whole to form an integrated sealing structure.
As a further improvement of the present invention, the step (4) further includes: after the first fixing piece, the second fixing piece and the third fixing piece are injection molded, an explosion-proof valve protection cover is assembled at the bottom of the lower insulating support and below the third fixing piece, and after the explosion-proof valve protection cover is assembled, the explosion-proof valve protection cover is hooked on the lower insulating support.
The secondary battery top cover assembly obtained by implementing the injection molding assembly method is characterized by comprising the following steps:
a top cover plate, on which a plurality of top cover plate injection molding via holes are formed;
The first sealing piece and the second sealing piece are arranged on the top cover plate, and a plurality of sealing piece injection molding through holes corresponding to the top cover plate injection molding through holes are formed on the first sealing piece and the second sealing piece respectively;
the first electrode terminal is arranged on the first sealing piece, the second electrode terminal is arranged on the second sealing piece, and a plurality of terminal injection molding through holes corresponding to the sealing piece injection molding through holes are formed on the first electrode terminal and the second electrode terminal respectively;
the explosion-proof structure is arranged on the bottom surface of the top cover plate and comprises an explosion-proof valve arranged on the bottom surface of the top cover plate, a third sealing piece arranged below the explosion-proof valve and a metal piece arranged below the third sealing piece, wherein a plurality of connecting injection molding through holes are respectively formed on the top cover plate, the explosion-proof valve, the third sealing piece and the metal piece;
the lower insulating bracket is arranged below the top cover plate;
the first fixing piece is arranged on the top cover plate, a plurality of first colloids formed on the first fixing piece sequentially penetrate through terminal injection molding through holes of the first electrode terminals, sealing piece injection molding through holes of the first sealing piece and the top cover plate injection molding through holes of the top cover plate from top to bottom and are connected with the lower insulating support into a whole;
The second fixing piece is arranged on the top cover plate, a plurality of second colloids formed on the second fixing piece sequentially penetrate through terminal injection molding through holes of the second electrode terminals, sealing piece injection molding through holes of the second sealing piece and the top cover plate injection molding through holes of the top cover plate from top to bottom and are connected with the lower insulating support into a whole;
the third fixing piece is arranged on the bottom surface of the top cover plate, and a plurality of third colloids formed on the third fixing piece sequentially penetrate through the metal piece, the third sealing piece, the connection injection molding via hole of the explosion-proof valve and the top cover plate from bottom to top and are connected with the lower insulating support into a whole to form an integrated sealing structure;
the first connecting piece is sleeved on the bottom surface of the first electrode terminal;
and the second connecting sheet is sleeved on the bottom surface of the second electrode terminal.
As a further improvement of the invention, the first electrode terminal and the second electrode terminal have the same structure and respectively comprise a lower terminal plate and an upper terminal plate arranged on the lower terminal plate, wherein a terminal protruding part is convexly arranged on the lower end surface of the lower terminal plate, and a plurality of terminal injection molding through holes on the first electrode terminal and the second electrode terminal are uniformly distributed on the lower terminal plate.
As a further improvement of the present invention, the lower terminal plate of the second electrode terminal is made of a copper-aluminum composite material.
As a further improvement of the invention, two mounting positions for mounting the first electrode terminal and the second electrode terminal are formed on the top cover plate, terminal leading-out holes for leading out the terminal protruding parts are formed on the two mounting positions respectively, a top cover plate sinking part is formed on the periphery of the terminal leading-out holes, the plurality of top cover plate injection molding through holes are uniformly distributed on the top cover plate sinking part, and the first sealing element and the second sealing element are respectively arranged on the top cover plate sinking parts on the two mounting positions.
As a further improvement of the invention, a sealing member through hole for the terminal protruding part to pass through is formed in the middle of the first sealing member, a plurality of positioning cylinders are convexly arranged on the first sealing member and positioned at the periphery of the sealing member through hole, and a plurality of positioning holes for the positioning cylinders to be inserted are formed on the lower terminal plate; a plurality of top cover plate special-shaped grooves are formed in the inner wall of the terminal leading-out hole, a sealing piece flange inserted into the terminal leading-out hole is downwards convexly arranged on the inner wall of the sealing piece perforation, a plurality of sealing piece special-shaped protruding blocks clamped into the top cover plate special-shaped grooves are formed on the outer side of the sealing piece flange, and the second sealing piece and the first sealing piece are identical in structure.
As a further improvement of the invention, two insulating bracket through holes which are in one-to-one correspondence with the terminal leading-out holes are formed on the lower insulating bracket, and a plurality of insulating bracket special-shaped grooves are formed on the periphery of the insulating bracket through holes; a plurality of fixing piece special-shaped convex blocks clamped in the insulation 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 colloids are correspondingly connected with the fixing piece special-shaped protruding blocks on the first fixing piece, and the second colloids are correspondingly connected with the fixing piece special-shaped protruding blocks on the second fixing piece.
As a further improvement of the invention, a plurality of positioning convex columns are arranged on the lower insulating support, and a plurality of positioning grooves for clamping in the positioning convex columns are formed at the bottom of the top cover plate.
As a further improvement of the present invention, a first through hole through which the terminal protrusion of the first electrode terminal passes is formed in the first connecting piece, and a second through hole and a first U-shaped side groove are also formed in the first connecting piece; a third through hole for the terminal protrusion of the second electrode terminal to pass through is formed on the second connecting piece, and a second U-shaped side groove is also formed on the second connecting piece.
As a further improvement of the invention, an explosion-proof valve mounting hole is formed on the top cover plate, an annular mounting groove positioned at the periphery of the explosion-proof valve mounting hole is formed on the lower end surface of the top cover plate, and the explosion-proof valve, the third sealing piece and the metal piece are respectively arranged in the annular mounting groove; a blasting area corresponding to the explosion-proof valve mounting hole is formed on the inner side of the explosion-proof valve, a sealing piece through hole corresponding to the blasting area is formed on the inner side of the third sealing piece, a metal piece through hole corresponding to the sealing piece through hole is formed on the inner side of the metal piece, an explosion-proof valve air hole corresponding to the metal piece through hole is formed on the third fixing piece, and a through hole for the third fixing piece to penetrate is formed on the lower insulating support.
As a further improvement of the invention, an inner annular flange and an outer annular flange which are positioned at the periphery of the explosion-proof valve mounting hole are formed on the upper end face of the top cover plate, an annular groove is formed between the inner annular flange and the outer annular flange, and a plurality of connecting injection molding through holes on the top cover plate are uniformly distributed on the annular groove.
As a further improvement of the invention, a plurality of special-shaped clamping grooves positioned at the periphery of the third colloids are formed on the third fixing piece, and a plurality of special-shaped clamping blocks clamped into the special-shaped clamping grooves are formed on the inner wall of the through hole of the lower insulating support.
As a further improvement of the invention, the explosion-proof structure further comprises an explosion-proof valve protection cover which is arranged below the third fixing piece and hooked on the lower insulating support, a plurality of clamping holes are formed on the lower insulating support, and a plurality of elastic hooks hooked into the clamping holes are formed on the explosion-proof valve protection cover; the upper surface of the explosion-proof valve protecting cover is annularly provided with a plurality of small bosses, and a plurality of protecting cover perforations positioned on the inner sides of the small bosses are formed on the upper surface of the explosion-proof valve protecting cover.
As a further improvement of the present invention, a protective film is provided on the explosion-proof valve mounting hole.
The beneficial effects of the invention are as follows:
(1) According to the injection molding assembly method of the secondary battery top cover assembly, all the components are assembled together, and finally 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 by the molded first fixing piece and the second fixing piece respectively, the explosion-proof structure is tightly fixed on the top cover plate by the molded third fixing piece, and the first electrode terminal and the second electrode terminal are respectively reinforced on the top cover plate by the first connecting piece and the second connecting piece, so that an integrated sealing structure is formed. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and improved the leakproofness after first electrode terminal, second electrode terminal and explosion-proof structure assemble respectively on the lamina tecti, increased the bonding stability between the structure, increased fixed dynamics, promoted product performance, improved product reliability in use.
(2) The secondary battery top cover assembly provided by the invention is characterized in that the first electrode terminal and the second electrode terminal are fixedly connected to the top cover plate respectively through the plurality of colloids formed on the first fixing piece and the second fixing piece, the explosion-proof structure is fixedly connected to the bottom surface of the top cover plate through the plurality of colloids formed on the third fixing piece, and the first electrode terminal and the second electrode terminal are reinforced to the top cover plate through the first connecting piece and the second connecting piece respectively, so that an integrated sealing structure is formed. Therefore, the tightness of the first electrode terminal, the second electrode terminal and the explosion-proof structure after being assembled on the top cover plate is improved, the combination stability among the structures is improved, the fixing force is increased, the product performance is improved, and the product use reliability is improved; in addition, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
The foregoing is a summary of the invention and is further defined by the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
FIG. 1 is an exploded view of a header assembly of the present invention;
fig. 2 is a sectional view showing the second electrode terminal and the cap plate assembled in accordance with the present invention;
FIG. 3 is a cross-sectional view of the explosion-proof structure of the present invention assembled with a roof panel;
fig. 4 is a schematic structural view of a secondary battery according to the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description of the specific embodiments of the present invention is given with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 3, an injection molding assembly method of a secondary battery top cap assembly 100 according to an embodiment of the present invention includes the following steps:
(1) The following components were prepared: the top cover plate 1, the first electrode terminal 2, the second electrode terminal 3, the first sealing member 8, the second sealing member 9, the explosion-proof structure 4, the lower insulating bracket 5, the first connecting piece 24 and the second connecting piece 34;
(2) The lower insulating support 5 is assembled on the bottom surface of the top cover plate 1;
(3) The first sealing member 8 is assembled to the bottom surface of the first electrode terminal 2, and then the first electrode terminal 2 assembled with the first sealing member 8 is assembled to the upper surface of the top cover plate 1; meanwhile, the second sealing member 9 is mounted on the bottom surface of the second electrode terminal 3, and then the second electrode terminal 3 mounted with the second sealing member 9 is mounted on the upper surface of the top cover plate 1;
(4) Assembling an explosion-proof structure 4 on the bottom surface of the top cover plate 1;
(5) After assembly, the whole body is put into a mould, then an injection molding process is carried out, a first fixing piece 6 is formed on the top cover plate 1 and corresponds to the position of the first electrode terminal 2, and a first colloid 60 formed on the first fixing piece 6 sequentially penetrates through the first electrode terminal 2, the first sealing piece 8 and the top cover plate 1 from top to bottom and is connected with the lower insulating bracket 5 into a whole; forming a second fixing piece 7 on the top cover plate 1 and corresponding to the second electrode terminal 3, wherein a second colloid 70 formed on the second fixing piece 7 sequentially penetrates through the second electrode terminal 3, the second sealing piece 9 and the top cover plate 1 from top to bottom and is connected with the lower insulating bracket 5 into a whole; simultaneously, the explosion-proof structure 4 and the top cover plate 1 are injection molded into a whole;
(6) The first connecting sheet 24 is assembled on the bottom surface of the first electrode terminal 2, the second connecting sheet 34 is assembled on the bottom surface of the second electrode terminal 3, and then the first connecting sheet and the second connecting sheet are fixedly connected by spot welding to form an integrated sealing structure;
wherein, the steps (2), (3) and (4) are not in sequence.
In step (6), the spot welding process includes two kinds of processes, respectively: ultrasonic spot welding process and laser spot welding process. The present embodiment may employ two spot welding processes, but is not limited to these two spot welding processes, and other welding processes may be implemented.
In this embodiment, the components are assembled together, and finally, injection molding is performed by an injection molding process, the molded first fixing piece 6 and second fixing piece 7 respectively tightly fix the first electrode terminal 2 and the second electrode terminal 3 on the top cover plate 1, and the first connecting piece 24 and the second connecting piece 34 respectively strengthen the first electrode terminal 2 and the second electrode terminal 3 on the top cover plate 1, so as to form an integral sealing structure. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and improved the leakproofness after first electrode terminal 2 and second electrode terminal 3 assemble on lamina tecti 1, increased the bonding stability between the structure, increased fixed dynamics, promoted the product performance, improved product reliability in use.
In the step (1), the explosion-proof structure 4 includes an explosion-proof valve 41, a third seal 43, and a metal piece 44; in the step (4), the explosion-proof valve 41 is assembled on the bottom surface of the top cover plate 1, the third seal 43 is assembled on the bottom surface of the explosion-proof valve 41, and the metal piece 44 is assembled on the bottom surface of the third seal 43; in the step (5), a third fixing member 42 is formed on the top cover plate 1 through an injection molding process, and a third colloid 420 formed on the third fixing member 42 sequentially penetrates through the metal member 44, the third sealing member 43, the explosion-proof valve 41 and the top cover plate 1 from bottom to top, and is connected with the lower insulating support 5 into a whole to form an integral sealing structure.
The third sealing member 43 is pressed upward by the metal member 44, the explosion-proof valve 41 is pressed against the roof panel 1 by the third sealing member 43, and then the third fixing member 42 is injection-molded to join them together. Compared with the problem that the explosion-proof valve 41 is directly welded on the top cover plate 1, the explosion-proof valve 41 has air holes and poor tightness, and the mounting tightness of the explosion-proof valve 41 can be improved after the assembly of the embodiment.
The explosion-proof valve 41, the third sealing piece 43 and the metal piece 44 are assembled on the bottom surface of the top cover plate 1, and then injection molding is carried out once through an injection molding process, and the formed third fixing piece 42 tightly fixes the metal piece 44, the third sealing piece 43 and the explosion-proof valve 41 on the top cover plate 1 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 tightness of the product structure is improved, the combination stability between the structures is improved, the fixing force is increased, the product performance is improved, and the product use reliability is improved.
The step (4) further comprises: after the first fixing piece 6, the second fixing piece 7 and the third fixing piece 42 are injection molded, an explosion-proof valve protection cover 45 is assembled at the bottom of the lower insulating support 5 and below the third fixing piece 42, and after the explosion-proof valve protection cover 45 is assembled, the explosion-proof valve protection cover 45 is hooked on the lower insulating support 5. The explosion valve 41 is protected by an explosion valve protection cover 45.
The present embodiment also provides a secondary battery top cap assembly 100 obtained by performing the above injection molding assembly method, referring to fig. 1 to 3, including:
a top cover plate 1, wherein a plurality of top cover plate injection molding via holes 10 are formed on the top cover plate 1;
the first sealing element 8 and the second sealing element 9 are arranged on the top cover plate 1, and a plurality of sealing element injection molding through holes (80, 90) corresponding to the top cover plate injection molding through holes 10 are respectively formed on the first sealing element 8 and the second sealing element 9;
a first electrode terminal 2 and a second electrode terminal 3, wherein the first electrode terminal 2 is arranged on a first sealing member 8, the second electrode terminal 3 is arranged on a second sealing member 9, and a plurality of terminal injection molding through holes (20, 30) corresponding to the sealing member injection molding through holes (80, 90) are respectively formed on the first electrode terminal 2 and the second electrode terminal 3;
an explosion-proof structure 4 disposed on the bottom surface of the top cover plate 1, wherein the explosion-proof structure 4 comprises an explosion-proof valve 41 disposed on the bottom surface of the top cover plate, a third sealing member 43 disposed below the explosion-proof valve 41, and a metal member 44 disposed below the third sealing member 43, and a plurality of connection injection molding through holes (16,410,430,440) are respectively formed on the top cover plate 1, the explosion-proof valve 41, the third sealing member 43, and the metal member 44;
A lower insulating bracket 5 provided below the top cover plate 1;
the first fixing piece 6 is arranged on the top cover plate 1, and a plurality of first colloids 60 formed on the first fixing piece 6 sequentially penetrate through the terminal injection molding via hole 20 of the first electrode terminal 2, the sealing piece injection molding via hole 80 of the first sealing piece 8, the top cover plate injection molding via hole 10 of the top cover plate 1 from top to bottom and are connected with the lower insulating bracket 5 into a whole;
the second fixing piece 7 is arranged on the top cover plate 1, and a plurality of second colloid 70 formed on the second fixing piece 7 sequentially penetrates through the terminal injection molding via hole 30 of the second electrode terminal 3, the sealing piece injection molding via hole 90 of the second sealing piece 90 and the top cover plate injection molding via hole 10 of the top cover plate 1 from top to bottom and is connected with the lower insulating bracket 5 into a whole;
the third fixing piece 42 is arranged on the bottom surface of the top cover plate 1, and a plurality of third colloids 420 formed on the third fixing piece 42 sequentially penetrate through the metal piece 44, the third sealing piece 43, the connection injection molding via hole of the explosion-proof valve 41 and the top cover plate 1 from bottom to top, and are connected with the lower insulating support 5 into a whole to form an integrated sealing structure;
a first connecting piece 24 which is sleeved on the bottom surface of the first electrode terminal 2;
and the second connecting piece 34 is sleeved on the bottom surface of the second electrode terminal 3.
In the present embodiment, the first seal 8 and the second seal 9 function not only as a seal but also as a seal for insulating the first electrode terminal 2 from the top cover plate 1 and the second electrode terminal 3 from the top cover plate 1.
The injection molding via holes 20 of the first electrode terminals 2, the injection molding via holes 80 of the first sealing members 8 and the injection molding via holes 10 of the top cover plates 1 are arranged in a one-to-one correspondence in the vertical direction, so that the first colloids 60 formed on the first fixing members 6 can sequentially penetrate from top to bottom, and the first electrode terminals 2 are tightly and firmly assembled on the top cover plates 1. Similarly, the plurality of terminal injection molding through holes 30 of the second electrode terminal 3, the plurality of sealing member injection molding through holes 90 of the second sealing member 9 and the plurality of top cover plate injection molding through holes 10 of the top cover plate 1 are arranged in a one-to-one correspondence manner in the vertical direction, so that the plurality of second colloids 70 formed on the second fixing member 7 can sequentially penetrate from top to bottom, and the second electrode terminal 3 is tightly and firmly assembled on the top cover plate 1.
The first electrode terminal 2 and the second electrode terminal 3 are fixedly connected to the top cover plate 1 by using a plurality of first colloids 60 formed on the first fixing piece 6, a plurality of second colloids 70 formed on the second fixing piece 7, and a plurality of third colloids 420 formed on the third fixing piece 42, the explosion-proof valve 41, the third sealing piece 43 and the metal piece 44 are fixedly connected to the bottom surface of the top cover plate 1, and the first electrode terminal 2 and the second electrode terminal 3 are respectively reinforced to the top cover plate 1 by the first connecting piece 24 and the second connecting piece 34, so that an integrated sealing structure is formed. Thereby, not only the tightness of the first electrode terminal 2, the second electrode terminal 3 and the explosion-proof valve 41 after being assembled on the top cover plate 1 is improved, the combination stability between structures is improved, the fixing force is increased, the product performance is improved, and the product use reliability is improved; in addition, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.
In this embodiment, the first electrode terminal 2 and the second electrode terminal 3 have the same structure, and the second electrode terminal 3 is described below as an example, and the second electrode terminal 3 includes a lower terminal plate 31 and an upper terminal plate 32 disposed on the lower terminal plate 31, wherein a terminal protrusion 33 is protruding on the lower end surface of the lower terminal plate 31, and a plurality of terminal injection molding vias (20, 30) on the first electrode terminal 2 and the second electrode terminal 3 are uniformly distributed on the lower terminal plate 31.
In the present embodiment, the first electrode terminal 2 is a positive electrode post, and the second electrode terminal 3 is a negative electrode post. The shapes of the lower terminal plate 31 and the upper terminal plate 32 of the first electrode terminal 2 and the second electrode terminal 3 may be circular, square, polygonal, elliptical, irregular, etc., but are not limited to these shapes.
In this embodiment, the lower terminal plate 31 of the second electrode terminal 3 is made of a copper-aluminum composite material, specifically, a copper-aluminum composite material is punched. Compared with the traditional mode of combining the manufactured aluminum block and the copper block in a friction welding mode, the aluminum-copper composite material is formed by directly stamping, so that the production efficiency can be improved, the equipment cost can be reduced, the poor combination condition can be reduced, and the product yield can be improved.
In this embodiment, two mounting locations 11 for mounting the first electrode terminal 2 and the second electrode terminal 3 are formed on the top cover 1, terminal extraction holes 12 for extracting the terminal protruding portions 33 are formed on the two mounting locations 11, a top cover sinking portion 13 is formed on the periphery of the terminal extraction holes 12, the plurality of top cover injection molding through holes 10 are uniformly distributed on the top cover sinking portion 13, and the first sealing member 8 and the second sealing member 9 are respectively arranged on the top cover sinking portions 13 on the two mounting locations 11. As shown in fig. 2, the lower terminal plate 31 of the second electrode terminal 3, the second seal 9 and the top cover plate depressed portion 13 are closely adhered together.
In order to improve the bonding stability between the lower terminal plate of the first electrode terminal 2 and the first sealing member 8, in this embodiment, a sealing member through hole 81 through which the terminal protruding portion of the first electrode terminal 2 passes is formed in the middle of the first sealing member 8, a plurality of positioning cylinders 82 are protruding on the first sealing member 8 and located at the periphery of the sealing member through hole 81, a plurality of positioning holes 21 into which the positioning cylinders 82 are inserted are formed on the lower terminal plate of the first electrode terminal 2, and after the first sealing member 8 is assembled on the lower terminal plate of the first electrode terminal 2, the plurality of positioning cylinders 82 are inserted into the plurality of positioning holes 21 to be cooperatively positioned, so as to prevent rotation between the first sealing member 8 and the first electrode terminal 2, realize tight bonding between the first sealing member 8 and the first electrode terminal 2, and improve the bonding stability between the two.
In this embodiment, the second sealing member 9 has the same structure as the first sealing member 8, specifically, a sealing member through hole 91 through which the terminal protruding portion 33 of the second electrode terminal 3 passes is formed in the middle of the second sealing member 9, a plurality of positioning cylinders 92 are protruding on the second sealing member 9 and located at the periphery of the sealing member through hole 91, a plurality of positioning holes 35 into which the positioning cylinders 92 are inserted are formed on the lower terminal plate 31 of the second electrode terminal 3, and after the second sealing member 9 is assembled on the lower terminal plate 31 of the second electrode terminal 3, the plurality of positioning cylinders 92 are inserted into the plurality of positioning holes 35 to be cooperatively positioned, so as to prevent rotation between the second sealing member 9 and the second electrode terminal 3, and achieve tight combination of the second sealing member 9 and the second electrode terminal 3, thereby improving combination stability of the two.
Meanwhile, in order to improve the combination stability of the first sealing member 8 and the top cover plate 1, in this embodiment, a plurality of top cover plate shaped grooves 14 are formed on the inner wall of the terminal lead-out hole 12, a sealing member flange 83 inserted into the terminal lead-out hole 12 is provided on the inner wall of the sealing member through hole 81 in a downward protruding manner, and a plurality of sealing member shaped protrusions engaged into the top cover plate shaped grooves 14 are formed on the outer side of the sealing member flange 83. When the first electrode terminal 2 assembled with the first sealing member 8 is assembled on the top cover plate sunken part 13 of the top cover plate 1, the sealing member special-shaped protruding blocks are matched and positioned in the top cover plate special-shaped groove 14 so as to fix the first sealing member 8 and prevent the first sealing member 8 from rotating, so that the tight combination of the first sealing member 8 and the top cover plate 1 is realized, and the combination stability of the first sealing member 8 and the top cover plate is improved. Thereby, when the first electrode terminal 2 and the first sealing member 8 are mounted to the cap plate 1, the second injection hole is prevented from being displaced from the center position by the sequential folding.
Similarly, a seal flange 93 inserted into the terminal lead-out hole 12 is provided on the inner wall of the seal through hole 91 in a downward protruding manner, and a plurality of seal shaped projections which are engaged into the top cover plate shaped groove 14 are formed on the outer side of the seal flange 93. When the second electrode terminal 3 assembled with the second sealing member 9 is assembled on the top cover plate sunken part 13 of the top cover plate 1, the sealing member special-shaped protruding blocks are matched and positioned in the top cover plate special-shaped groove 14 so as to fix the second sealing member 9 and prevent the second sealing member 9 from rotating, so that the tight combination of the second sealing member 9 and the top cover plate 1 is realized, and the combination stability of the second electrode terminal and the top cover plate is improved. Thereby, when the second electrode terminal 3 and the second sealing member 9 are mounted to the cap plate 1, the second injection hole is prevented from being displaced in the center position by the sequential folding.
Thus, when the first electrode terminal 2 and the first seal 8, and the second electrode terminal 3 and the second seal 9 are attached to the cap plate 1, the occurrence of misalignment of the center positions of the injection-molded vias due to sequential folding is prevented. At the same time, the first electrode terminal 2 is insulated from the top cover plate 1 by the first sealing member 8, and the second electrode terminal 3 is insulated from the top cover plate 1 by the second sealing member 9.
In the present embodiment, two insulating bracket through holes 51 corresponding to the terminal extraction holes 12 one by one are formed on the lower insulating bracket 5, and a plurality of insulating bracket shaped grooves 52 are formed on the periphery of the insulating bracket through holes 51; a plurality of fixing piece special-shaped convex blocks (61, 71) clamped in the insulation bracket special-shaped groove 52 are respectively formed on the outer sides of the lower parts of the first fixing piece 6 and the second fixing piece 7; the first colloids 60 are correspondingly connected with the fixing piece special-shaped bumps 61 on the first fixing piece 6, and the second colloids 70 are correspondingly connected with the fixing piece special-shaped bumps 71 on the second fixing piece 7. When the first fixing piece 6 is injection molded, the first colloid 60 and the fixing piece special-shaped protruding block 61 are integrally molded, and the fixing piece special-shaped protruding block 61 is molded in the insulation support special-shaped groove 52, so that the lower insulation support 5 is connected to the bottom surface of the top cover plate 1 through the first fixing piece 6 by matching and connecting the fixing piece special-shaped protruding block 61 and the insulation support special-shaped groove 52. Similarly, when the second fixing member 7 is injection molded, the second colloid 70 and the fixing member shaped protruding block 71 are integrally molded, and the fixing member shaped protruding block 71 is molded in the insulating support shaped groove 52, so that the lower insulating support 5 is connected to the bottom surface of the top cover plate 1 through the second fixing member 7 by the matching connection of the fixing member shaped protruding block 71 and the insulating support shaped groove 52.
In order to improve the combination stability of the lower insulating support 5 and the top cover 1, in this embodiment, a plurality of positioning protruding columns 53 are disposed on the lower insulating support 5, and a plurality of positioning grooves into which the positioning protruding columns 53 are clamped are formed at the bottom of the top cover 1. The positioning convex columns 53 are combined with the positioning grooves, so that the lower insulating support 5 is stably limited on the bottom surface of the top cover plate 1.
In the present embodiment, a first through hole 241 through which the terminal protrusion of the first electrode terminal 2 passes is formed in the first connecting piece 24, and a second through hole 242 and a first U-shaped side groove 243 are also formed in the first connecting piece 24. The first connecting piece 24 may be made of an aluminum material, and the first connecting piece 24 may be an integral structure of an aluminum material.
A third through hole 341 through which the terminal protrusion 33 of the second electrode terminal 3 passes is formed on the second connection piece 34, and a second U-shaped side groove 342 is also formed on the second connection piece 34. The second connecting piece 34 may be made of copper, and the second connecting piece 34 is an integral structure made of copper.
In this embodiment, an explosion-proof valve mounting hole 17 is formed on the top cover plate 1, an annular mounting groove 18 is formed on the lower end surface of the top cover plate 1 and is located at the periphery of the explosion-proof valve mounting hole 17, and the explosion-proof valve 41, the third sealing member 43 and the metal member 44 are respectively arranged in the annular mounting groove 18; a burst region 411 corresponding to the burst valve mounting hole 17 is formed inside the burst valve 41, a seal through hole 431 corresponding to the burst region 411 is formed inside the third seal 43, a metal through hole 441 corresponding to the seal through hole 431 is formed inside the metal 44, an explosion valve vent 421 corresponding to the metal through hole 441 is formed on the third mount 42, and a through hole 54 through which the third mount 42 is passed is formed on the lower insulating holder 5. The explosion area 411, the sealing member through hole 431, the metal member through hole 441 and the explosion-proof valve air hole 421 are longitudinally arranged in one-to-one correspondence with the through holes 54. When the pressure in the battery reaches the explosion pressure value of the explosion-proof valve 41, the explosion can be directly communicated with the outside through the explosion-proof valve air holes 421, the through holes 54, the explosion zone 411, the sealing piece through holes 431 and the explosion zone 411, so that air can be quickly released, and the explosion of the high pressure in the battery box can be prevented.
In this embodiment, an inner annular flange 171 and an outer annular flange 172 are formed on the upper end surface of the top cover plate 1 and located at the periphery of the explosion-proof valve mounting hole 17, an annular groove 173 is formed between the inner annular flange 171 and the outer annular flange 172, and the plurality of connection injection molding through holes 16 on the top cover plate 1 are uniformly distributed on the annular groove 173.
In the present embodiment, a plurality of shaped clamping grooves 422 located at the periphery of a plurality of third colloids 420 are formed on the third fixing member 42, and a plurality of shaped clamping blocks 55 clamped into the shaped clamping grooves 422 are formed on the inner wall of the through hole 54 of the lower insulating support 5. The plurality of special-shaped clamping blocks 55 are matched with the plurality of special-shaped clamping grooves 422, so that the third fixing piece 42 is tightly combined with the lower insulating support 5.
In the present embodiment, the shapes of the top cover plate injection molding via 10, the seal injection molding via (80, 90), the terminal injection molding via (20, 30), the connection injection molding via (16,410,430,440) may be circular, square, polygonal, elliptical, irregular, etc., but are not limited to these shapes.
In this embodiment, the explosion-proof structure 4 further includes an explosion-proof valve protection cover 45 disposed below the third fixing member 42 and hooked on the lower insulating bracket 5, a plurality of fastening holes 56 are formed on the lower insulating bracket 5, and a plurality of elastic hooks 451 hooked into the fastening holes 56 are formed on the explosion-proof valve protection cover 45. The elastic clamping hooks 451 are hooked into the clamping holes 56, so that the explosion-proof valve protection cover 45 is stably connected with the lower insulating support 5.
Meanwhile, a plurality of small bosses 452 are annularly arranged on the upper surface of the explosion-proof valve protection cover 45, a plurality of protection cover perforations 453 positioned on the inner sides of the plurality of small bosses 452 are formed on the upper surface of the explosion-proof valve protection cover 45, when the pressure in the battery reaches the explosion-proof pressure value of the explosion-proof valve 41, internal high-pressure gas can enter the explosion-proof valve air holes 421, the through holes 54, the explosion areas 411, the sealing element through holes 431 and the explosion areas 411 from the protection cover perforations 453 to directly pass through the outside, so that air is quickly discharged, and the explosion of the high pressure in the battery box is prevented.
In the present embodiment, the shapes of the small boss 452 and the protective cover penetrating hole 453 may be circular, square, polygonal, elliptical, irregular, etc., but are not limited to these shapes.
Meanwhile, a protection film 46 is provided on the explosion-proof valve mounting hole 17, and the explosion-proof valve 41 is protected by the protection film 46.
Meanwhile, at least one upper liquid injection hole 19 is formed in the top cover plate 1, and at least one lower liquid injection hole 57 corresponding to the upper liquid injection hole 19 is formed in the lower insulating holder 5.
In the present embodiment, the first fixing member 6, the second fixing member 7, the third fixing member 42, the lower insulating holder 5 and the explosion-proof valve protection cover 45 are all integrally formed of PPS, PSU, nano-material or the like, but the materials are not limited to these materials.
The embodiment of the invention also provides a secondary battery, as shown in fig. 4, comprising:
a housing 200 having an opening 2001 at its upper end;
an electrode assembly accommodated in the case 200;
the top cap assembly 100 described above, the top cap assembly 100 covers the opening 2001 of the case 200 to enclose the electrode assembly in the case 200.
It should be noted that the shapes of all the components mentioned in this 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 foregoing is merely a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to the above embodiments, so that other structures using the same or similar technical features as those of the above embodiments of the present invention are all within the scope of the present invention.
Claims (11)
1. A method of injection molding a top cap assembly of a secondary battery, comprising the steps of:
(1) The following components were prepared: the device comprises a top cover plate, a first electrode terminal, a second electrode terminal, a first sealing piece, a second sealing piece, an explosion-proof structure, a lower insulating bracket, a first connecting piece and a second connecting piece;
(2) Assembling a lower insulating bracket on the bottom surface of the top cover plate;
(3) Fitting a first sealing member to the bottom surface of the first electrode terminal, and then, fitting the first electrode terminal fitted with the first sealing member to the 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 top cap plate;
(4) Assembling an explosion-proof structure on the bottom surface of the top cover plate;
(5) After assembly, the whole body is put into a mould, then an injection molding process is carried out, a first fixing piece is formed on the top cover plate and corresponds to the first electrode terminal, and a first colloid formed on the first fixing piece sequentially penetrates through the first electrode terminal, the first sealing piece and the top cover plate from top to bottom and is connected with the lower insulating bracket into a whole; forming a second fixing piece on the top cover plate and corresponding to the second electrode terminal, wherein a second colloid formed on the second fixing piece sequentially penetrates through the second electrode terminal, the second sealing piece and the top cover plate from top to bottom and is connected with the lower insulating bracket into a whole; simultaneously, the explosion-proof structure and the top cover plate are injection molded into a whole;
(6) Assembling the first connecting sheet on the bottom surface of the first electrode terminal, assembling the second connecting sheet on the bottom surface of the second electrode terminal, and then performing spot welding connection and fixation to form an integrated sealing structure;
Wherein, the steps (2), (3) and (4) have no sequence;
in the step (1), the explosion-proof structure comprises an explosion-proof valve, a third sealing element and a metal piece; in the step (4), the explosion-proof valve is assembled on the bottom surface of the top cover plate, the third sealing element is assembled on the bottom surface of the explosion-proof valve, and the metal element is assembled on the bottom surface of the third sealing element; in the step (5), a third fixing piece is formed on the top cover plate through an injection molding process, and a third colloid formed on the third fixing piece sequentially penetrates through the metal piece, the third sealing piece, the explosion-proof valve and the top cover plate from bottom to top and is connected with the lower insulating support into a whole to form an integrated sealing structure.
2. The injection molding assembly method of the secondary battery top cap assembly according to claim 1, wherein the step (5) further comprises: after the first fixing piece, the second fixing piece and the third fixing piece are injection molded, an explosion-proof valve protection cover is assembled at the bottom of the lower insulating support and below the third fixing piece, and after the explosion-proof valve protection cover is assembled, the explosion-proof valve protection cover is hooked on the lower insulating support.
3. A secondary battery top cap assembly obtained by carrying out the injection molding assembly method according to any one of claims 1 to 2, characterized by comprising:
A top cover plate, on which a plurality of top cover plate injection molding via holes are formed;
the first sealing piece and the second sealing piece are arranged on the top cover plate, and a plurality of sealing piece injection molding through holes corresponding to the top cover plate injection molding through holes are formed on the first sealing piece and the second sealing piece respectively;
the first electrode terminal is arranged on the first sealing piece, the second electrode terminal is arranged on the second sealing piece, and a plurality of terminal injection molding through holes corresponding to the sealing piece injection molding through holes are formed on the first electrode terminal and the second electrode terminal respectively;
the explosion-proof structure is arranged on the bottom surface of the top cover plate and comprises an explosion-proof valve arranged on the bottom surface of the top cover plate, a third sealing piece arranged below the explosion-proof valve and a metal piece arranged below the third sealing piece, wherein a plurality of connecting injection molding through holes are respectively formed on the top cover plate, the explosion-proof valve, the third sealing piece and the metal piece;
the lower insulating bracket is arranged below the top cover plate;
the first fixing piece is arranged on the top cover plate, a plurality of first colloids formed on the first fixing piece sequentially penetrate through terminal injection molding through holes of the first electrode terminals, sealing piece injection molding through holes of the first sealing piece and the top cover plate injection molding through holes of the top cover plate from top to bottom and are connected with the lower insulating support into a whole;
The second fixing piece is arranged on the top cover plate, a plurality of second colloids formed on the second fixing piece sequentially penetrate through terminal injection molding through holes of the second electrode terminals, sealing piece injection molding through holes of the second sealing piece and the top cover plate injection molding through holes of the top cover plate from top to bottom and are connected with the lower insulating support into a whole;
the third fixing piece is arranged on the bottom surface of the top cover plate, and a plurality of third colloids formed on the third fixing piece sequentially penetrate through the metal piece, the third sealing piece, the connection injection molding via hole of the explosion-proof valve and the top cover plate from bottom to top and are connected with the lower insulating support into a whole to form an integrated sealing structure;
the first connecting piece is sleeved on the bottom surface of the first electrode terminal;
and the second connecting sheet is sleeved on the bottom surface of the second electrode terminal.
4. The secondary battery top cap assembly according to claim 3, wherein the first electrode terminal and the second electrode terminal have the same structure, and each of the first electrode terminal and the second electrode terminal comprises a lower terminal plate and an upper terminal plate disposed on the lower terminal plate, wherein a terminal protrusion is protruded from a lower end surface of the lower terminal plate, and a plurality of terminal injection molding through holes of the first electrode terminal and the second electrode terminal are uniformly distributed on the lower terminal plate.
5. The secondary battery top cap assembly according to claim 4, wherein the lower terminal plate of the second electrode terminal is made of a copper-aluminum composite material.
6. The secondary battery top cap assembly according to claim 4, wherein two mounting positions for mounting the first electrode terminal and the second electrode terminal are formed on the top cap plate, terminal extraction holes for extracting the terminal protrusions are formed on the two mounting positions, a top cap plate sinking portion is formed on the periphery of the terminal extraction holes, the plurality of top cap plate injection molding through holes are uniformly distributed on the top cap plate sinking portion, and the first sealing member and the second sealing member are respectively arranged on the top cap plate sinking portions on the two mounting positions.
7. The secondary battery top cap assembly according to claim 6, wherein a seal member penetration hole through which the terminal protrusion is penetrated is formed in the middle of the first seal member, a plurality of positioning cylinders are protruded on the first seal member at the periphery of the seal member penetration hole, and a plurality of positioning holes into which the positioning cylinders are inserted are formed on the lower terminal plate; a plurality of top cover plate special-shaped grooves are formed in the inner wall of the terminal leading-out hole, a sealing piece flange inserted into the terminal leading-out hole is downwards convexly arranged on the inner wall of the sealing piece perforation, a plurality of sealing piece special-shaped protruding blocks clamped into the top cover plate special-shaped grooves are formed on the outer side of the sealing piece flange, and the second sealing piece and the first sealing piece are identical in structure.
8. The secondary battery top cap assembly according to claim 6, wherein two insulating holder through holes corresponding to the terminal lead-out holes one by one are formed on the lower insulating holder, and a plurality of insulating holder shaped grooves are formed at the periphery of the insulating holder through holes; a plurality of fixing piece special-shaped convex blocks clamped in the insulation 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 colloids are correspondingly connected with the fixing piece special-shaped convex blocks on the first fixing piece, and the second colloids are correspondingly connected with the fixing piece special-shaped convex blocks on the second fixing piece; a plurality of positioning convex columns are arranged on the lower insulating support, and a plurality of positioning grooves for clamping in the positioning convex columns are formed at the bottom of the top cover plate; a first through hole for the terminal protrusion of the first electrode terminal to pass through is formed on the first connecting piece, and a second through hole and a first U-shaped side groove are also formed on the first connecting piece; a third through hole for the terminal protrusion of the second electrode terminal to pass through is formed on the second connecting piece, and a second U-shaped side groove is also formed on the second connecting piece.
9. The secondary battery top cap assembly according to claim 3, wherein an explosion-proof valve mounting hole is formed in the top cap plate, an annular mounting groove is formed in the lower end surface of the top cap plate at the periphery of the explosion-proof valve mounting hole, and the explosion-proof valve, the third sealing member and the metal member are respectively disposed in the annular mounting groove; a blasting area corresponding to the explosion-proof valve mounting hole is formed on the inner side of the explosion-proof valve, a sealing piece through hole corresponding to the blasting area is formed on the inner side of the third sealing piece, a metal piece through hole corresponding to the sealing piece through hole is formed on the inner side of the metal piece, an explosion-proof valve air hole corresponding to the metal piece through hole is formed on the third fixing piece, and a through hole for the third fixing piece to penetrate is formed on the lower insulating support.
10. The secondary battery top cap assembly according to claim 9, wherein an inner annular flange and an outer annular flange are formed at the upper end surface of the top cap plate at the periphery of the explosion-proof valve mounting hole, an annular groove is formed between the inner annular flange and the outer annular flange, and the plurality of connection injection-molded through holes on the top cap plate are uniformly distributed on the annular groove.
11. The secondary battery top cap assembly according to claim 3, wherein a plurality of shaped clamping grooves located at the periphery of the plurality of third colloids are formed on the third fixing member, and a plurality of shaped clamping blocks clamped into the shaped clamping grooves are formed on the inner wall of the through hole of the lower insulating bracket; the explosion-proof structure further comprises an explosion-proof valve protection cover which is arranged below the third fixing piece and hooked on the lower insulating support, a plurality of clamping holes are formed in the lower insulating support, and a plurality of elastic hooks hooked into the clamping holes are formed in the explosion-proof valve protection cover; the upper surface of the explosion-proof valve protecting cover is annularly provided with a plurality of small bosses, and a plurality of protecting cover perforations positioned on the inner sides of the small bosses are formed on the upper surface of the explosion-proof valve protecting cover.
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| CN202011612928.7A CN112736340B (en) | 2020-12-30 | 2020-12-30 | Injection molding assembly method of secondary battery top cover assembly and top cover assembly |
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| CN116207414A (en) * | 2021-11-30 | 2023-06-02 | 宁德时代新能源科技股份有限公司 | End cover assembly, battery monomer, battery and power consumption device |
| CN114284607A (en) * | 2021-12-17 | 2022-04-05 | 厦门海辰新能源科技有限公司 | Top cap subassembly, battery and energy memory |
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