CN112736340A - 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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- CN112736340A CN112736340A CN202011612928.7A CN202011612928A CN112736340A CN 112736340 A CN112736340 A CN 112736340A CN 202011612928 A CN202011612928 A CN 202011612928A CN 112736340 A CN112736340 A CN 112736340A
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- top cover
- cover plate
- electrode terminal
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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
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) assembling a lower insulating support on 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 cap plate; (4) assembling the explosion-proof structure on the top cover plate; (5) placing the first fixing piece into a mold, and performing injection molding, wherein a first colloid of the molded first fixing piece penetrates through the first electrode terminal, the first sealing piece and the top cover plate; 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 molded into a whole by injection; (6) and respectively assembling the first connecting sheet and the second connecting sheet on the bottom surfaces of the first electrode terminal and the second electrode terminal, and fixing 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 a great number of places need to be improved if fuel automobiles are completely replaced. For example, the problems of a small driving range of an automobile, a high cost of a battery pack, and reliability of the battery pack need to be further solved. Based on the above problems, higher requirements are put on the core part power battery of the electric vehicle, such as the need of achieving higher energy density, lower cost and the like of the power battery.
At present, a square hard shell structure is generally adopted by 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 from the inside of the closed space through a pole of the top cover assembly.
In the existing roof cover assembly, the roof cover 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 the assembly, the base part is located the below of lamina tecti (inside the casing promptly), treats that the extension passes behind the through-hole and utilizes the jump ring or adopt the riveting mode fixed extension, fixes utmost point post on the lamina tecti through this mode. Since the base portion is located inside the case, the space utilization rate inside the case is reduced, and the energy density of the power battery is reduced.
Because utmost point post structure itself and assembly process are complicated, not only can influence secondary battery's assembly efficiency, after being fixed in the lamina tecti with utmost point post on, often can be because fixed dynamics is not enough, and the phenomenon that utmost point post and lamina tecti break away from the connection appears to secondary battery's use reliability has been reduced.
Therefore, a new injection molding assembly method for a secondary battery top cap assembly and a top cap assembly are needed.
Disclosure of Invention
In view of the above disadvantages, the present invention provides an injection molding assembly method for a secondary battery top cap assembly and a top cap assembly, which not only greatly simplifies the assembly process, improves the assembly efficiency, and reduces the production cost; and the sealing performance of the first electrode terminal, the second electrode terminal and the explosion-proof structure after being assembled on the top cover plate respectively is improved, the combination stability between the structures is improved, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved.
The technical scheme adopted by the invention to achieve the aim is as follows:
an injection molding assembly method of a secondary battery top cap assembly is characterized by comprising the following steps:
(1) the following components were prepared: the explosion-proof structure comprises a top cover plate, a first electrode terminal, a second electrode terminal, a first sealing element, a second sealing element, an explosion-proof structure, a lower insulating support, a first connecting sheet and a second connecting sheet;
(2) assembling a lower insulating support on the bottom surface of the top cover plate;
(3) assembling a first sealing member to a bottom surface of the first electrode terminal, and then, assembling the first electrode terminal assembled with the first sealing member to an upper surface of the cap plate; meanwhile, a second sealing member is mounted on a bottom surface of the second electrode terminal, and then, the second electrode terminal mounted with the second sealing member is mounted on an upper surface of the cap plate;
(4) assembling the explosion-proof structure on the bottom surface of the top cover plate;
(5) after the assembly, the whole body is placed in a mold, then an injection molding process is carried out, a first fixing piece is formed on the top cover plate and corresponds to the position of 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 support 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 support into a whole; meanwhile, the explosion-proof structure and the top cover plate are molded into a whole by injection;
(6) assembling a first connecting sheet on the bottom surface of the first electrode terminal, assembling a 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 invention, 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 piece 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 comprises: after the first fixing piece, the second fixing piece and the third fixing piece are completed through injection molding, the explosion-proof valve protective cover is assembled at the bottom of the lower insulating support and below the third fixing piece, and after the assembly is completed, the explosion-proof valve protective cover is hooked on the lower insulating support.
The secondary battery top cover component obtained by implementing the injection molding assembly method is characterized by comprising the following steps:
the top cover plate is provided with a plurality of top cover plate injection molding through holes;
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, and 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;
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 element arranged below the explosion-proof valve and a metal piece arranged below the third sealing element, and a plurality of connecting injection molding through holes are respectively formed in the top cover plate, the explosion-proof valve, the third sealing element and the metal piece;
a lower insulating support disposed below the top cover plate;
the first fixing piece is arranged on the top cover plate, and a plurality of first colloids 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;
the second fixing piece is arranged on the top cover plate, and a plurality of second colloids formed on the second fixing piece sequentially penetrate 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 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 connecting injection molding through holes of the metal piece, the third sealing piece, 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;
a first connecting piece 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 present invention, the first electrode terminal and the second electrode terminal have the same structure, and respectively include a lower terminal plate and an upper terminal plate disposed on the lower terminal plate, wherein a terminal protrusion is protrudingly disposed on a 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 copper-aluminum composite.
As a further improvement of the present invention, two mounting positions for mounting the first electrode terminal and the second electrode terminal are formed on the top cover plate, respectively, a terminal lead-out hole for leading out the terminal protrusion is formed on the two mounting positions, respectively, 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 are uniformly distributed on the top cover plate sinking portion, and the first sealing member and the second sealing member are respectively arranged on the top cover plate sinking portions on the two mounting positions.
As a further improvement of the present invention, a sealing member through hole for the terminal protrusion to pass through is formed in the middle of the first sealing member, a plurality of positioning cylinders are convexly provided on the first sealing member and at the periphery of the sealing member through hole, and a plurality of positioning holes for the positioning cylinders to insert into are formed on the lower terminal plate; the terminal lead-out hole is characterized in that a plurality of top cover plate special-shaped grooves are formed in the inner wall of the terminal lead-out hole, a sealing element flange inserted into the terminal lead-out hole is arranged on the inner wall of the sealing element through hole in a downward protruding mode, a plurality of sealing element special-shaped convex blocks clamped into the top cover plate special-shaped grooves are formed in the outer side of the sealing element flange, and the second sealing element is the same as the first sealing element in structure.
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 present invention, a plurality of positioning convex columns are arranged on the lower insulating support, and a plurality of positioning grooves for the positioning convex columns to be clamped into 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 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 through which the terminal protrusion of the second electrode terminal passes is formed on the second connection piece, and a second U-shaped side groove is also formed on the second connection 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 element and the metal piece are respectively arranged in the annular mounting groove; a blasting area corresponding to the mounting hole of the explosion-proof valve is formed on the inner side of the explosion-proof valve, a sealing element through hole corresponding to the blasting area is formed on the inner side of the third sealing element, a metal element through hole corresponding to the sealing element through hole is formed on the inner side of the metal element, an explosion-proof valve air hole corresponding to the metal element through hole is formed on the third fixing element, and a through hole for the third fixing element to penetrate through 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 surface 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 present invention, a plurality of special-shaped slots located at the periphery of the plurality of third colloids are formed on the third fixing member, and a plurality of special-shaped fixture blocks clamped in the special-shaped slots 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 protective cover which is arranged below the third fixing piece and is hooked on the lower insulating bracket, a plurality of clamping holes are formed on the lower insulating bracket, and a plurality of elastic clamping hooks which are hooked into the clamping holes are formed on the explosion-proof valve protective cover; the explosion-proof valve protective cover is characterized in that a plurality of small bosses are annularly arranged on the upper surface of the explosion-proof valve protective cover, and a plurality of protective cover through holes located on the inner sides of the small bosses are formed in the upper surface of the explosion-proof valve protective cover.
As a further improvement of the invention, a protection film is arranged on the explosion-proof valve mounting hole.
The invention has the beneficial effects that:
(1) the injection molding assembly method of the secondary battery top cover assembly provided by the invention comprises the steps of assembling all the parts together, and finally carrying out one-time injection molding through an injection molding process, wherein a first molded fixing piece and a second molded fixing piece respectively and tightly fix a first electrode terminal and a second electrode terminal on a top cover plate, a third molded fixing piece tightly fixes an explosion-proof structure on the top cover plate, and the first electrode terminal and the second electrode terminal are respectively fixed on the top cover plate through a first connecting sheet and a second connecting sheet 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 sealing performance of the first electrode terminal, the second electrode terminal and the explosion-proof structure after being assembled on the top cover plate respectively is improved, the combination stability between the structures is improved, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved.
(2) The secondary battery top cover assembly provided by the invention has the advantages that the first electrode terminal and the second electrode terminal are respectively and fixedly connected onto the top cover plate by adopting the plurality of colloids formed on the first fixing piece and the second fixing piece, the explosion-proof structure is fixedly connected onto the bottom surface of the top cover plate by the plurality of colloids formed on the third fixing piece, and the first electrode terminal and the second electrode terminal are respectively and fixedly connected onto the top cover plate by the first connecting piece and the second connecting piece, so that an integrated sealing structure is formed. Therefore, the sealing performance 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 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.
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 header assembly of the present invention;
FIG. 2 is a cross-sectional view of the second electrode terminal and the top cover plate of the present invention after they are assembled;
FIG. 3 is a cross-sectional view of the explosion-proof structure of the present invention assembled with a top cover plate;
fig. 4 is a schematic view of the structure of a secondary battery according to the present invention.
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.
Referring to fig. 1 to 3, an embodiment of the invention provides an injection molding assembly method of a secondary battery top cap assembly 100, including the following steps:
(1) the following components were prepared: the explosion-proof structure comprises a top cover plate 1, a first electrode terminal 2, a second electrode terminal 3, a first sealing element 8, a second sealing element 9, an explosion-proof structure 4, a lower insulating support 5, a first connecting plate 24 and a second connecting plate 34;
(2) assembling a lower insulating support 5 on the bottom surface of the top cover plate 1;
(3) the first sealing member 8 is fitted to the bottom surface of the first electrode terminal 2, and then, the first electrode terminal 2 fitted with the first sealing member 8 is fitted to the upper surface of the cap plate 1; meanwhile, the second sealing member 9 is assembled to the bottom surface of the second electrode terminal 3, and then, the second electrode terminal 3 assembled with the second sealing member 9 is assembled to the upper surface of the cap plate 1;
(4) assembling an explosion-proof structure 4 on the bottom surface of the top cover plate 1;
(5) after being assembled, the whole body is placed in 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 position of 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; meanwhile, the explosion-proof structure 4 and the top cover plate 1 are molded into a whole by injection;
(6) assembling the first connecting piece 24 on the bottom surface of the first electrode terminal 2, assembling the second connecting piece 34 on the bottom surface of the second electrode terminal 3, 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.
In step (6), the spot welding process includes two kinds, respectively: ultrasonic spot welding process and laser spot welding process. The present embodiment may adopt the two spot welding processes, but is not limited to the two spot welding processes, and other welding processes may be implemented.
In the embodiment, the parts are assembled together, and finally, the first injection molding is performed through the injection molding process, the first electrode terminal 2 and the second electrode terminal 3 are respectively and tightly fixed on the top cover plate 1 by the first fixing piece 6 and the second fixing piece 7 which are formed, and the first electrode terminal 2 and the second electrode terminal 3 are respectively reinforced on the top cover plate 1 by the first connecting sheet 24 and the second connecting sheet 34, 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 the leakproofness after first electrode terminal 2 and second electrode terminal 3 assemble on lamina tecti 1 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.
In the step (1), the explosion-proof structure 4 comprises an explosion-proof valve 41, a third sealing member 43 and a metal member 44; in the step (4), the explosion-proof valve 41 is assembled on the bottom surface of the top cover plate 1, the third sealing member 43 is assembled on the bottom surface of the explosion-proof valve 41, and the metal member 44 is assembled on the bottom surface of the third sealing member 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 bracket 5 into a whole to form an integrated sealing structure.
The metal piece 44 is used to prop up the third sealing piece 43, the explosion-proof valve 41 is pressed on the top cover plate 1 by the third sealing piece 43, and then the third fixing piece 42 which is formed by injection molding is used to combine the third sealing piece and the explosion-proof valve. 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 sealing performance, and the installation sealing performance of the explosion-proof valve 41 can be improved after the explosion-proof valve is assembled in the embodiment.
The explosion-proof valve 41, the third sealing element 43 and the metal piece 44 are assembled on the bottom surface of the top cover plate 1, and then injection molding is performed once through an injection molding process, and the metal piece 44, the third sealing element 43 and the explosion-proof valve 41 are tightly fixed on the top cover plate 1 through the molded third fixing piece 42, 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 the sealing performance of the product structure is improved, the combination stability between the structures is increased, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved.
The step (4) further comprises: after the first fixing part 6, the second fixing part 7 and the third fixing part 42 are completed by injection molding, the explosion-proof valve protective cover 45 is assembled at the bottom of the lower insulating support 5 and below the third fixing part 42, and after the assembly is completed, the explosion-proof valve protective cover 45 is hooked on the lower insulating support 5. The explosion-proof valve 41 is protected by an explosion-proof valve protection cover 45.
The present embodiment also provides a secondary battery top cap assembly 100 obtained by implementing the injection molding assembly method described above, with reference to fig. 1 to 3, including:
the top cover plate 1 is provided with a plurality of top cover plate injection molding through holes 10;
the first sealing element 8 and the second sealing element 9 are both 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 sealing member injection molding through holes (80,90) are respectively formed on the first electrode terminal 2 and the second electrode terminal 3;
the explosion-proof structure 4 is arranged on the bottom surface of the top cover plate 1, the explosion-proof structure 4 comprises an explosion-proof valve 41 arranged on the bottom surface of the top cover plate, a third sealing element 43 arranged below the explosion-proof valve 41 and a metal piece 44 arranged below the third sealing element 43, and a plurality of connecting 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 element 43 and the metal piece 44;
a lower insulating support 5 disposed below the top cover plate 1;
a first fixing member 6 disposed on the top cover plate 1, wherein a plurality of first colloids 60 formed on the first fixing member 6 sequentially penetrate through the terminal injection molding via holes 20 of the first electrode terminals 2, the sealing member injection molding via holes 80 of the first sealing members 8, and the top cover plate injection molding via holes 10 of the top cover plate 1 from top to bottom, and are connected with the lower insulating support 5;
a second fixing member 7 disposed on the top cover plate 1, wherein a plurality of second colloids 70 formed on the second fixing member 7 sequentially penetrate through the terminal injection molding via holes 30 of the second electrode terminals 3, the sealing member injection molding via holes 90 of the second sealing members 90, and the top cover plate injection molding via holes 10 of the top cover plate 1 from top to bottom, and are connected with the lower insulating support 5;
the third fixing piece 42 is arranged on the bottom surface of the top cover plate 1, and a plurality of third colloid 420 formed on the third fixing piece 42 sequentially penetrate through the metal piece 44, the third sealing piece 43, the explosion-proof valve 41 and the connecting injection molding through hole of the top cover plate 1 from bottom to top and are connected with the lower insulating bracket 5 into a whole to form an integrated sealing structure;
a first connection piece 24 fitted on the bottom surface of the first electrode terminal 2;
and a second connection piece 34 fitted on the bottom surface of the second electrode terminal 3.
The first sealing member 8 and the second sealing member 9 of the present embodiment not only perform a sealing function, but also perform a function of insulating the first electrode terminal 2 from the top lid plate 1 and the second electrode terminal 3 from the top lid plate 1.
The several terminal of the first electrode terminal 2 of this embodiment is moulded plastics via hole 20, the several sealing member of first sealing member 8 and is moulded plastics via hole 80, and the several lamina tecti of lamina tecti 1 are moulded plastics via hole 10 and are set up in vertical direction one-to-one to the fashioned first colloid 60 of several can run through from top to bottom in proper order on first mounting 6, with the assembly that first electrode terminal 2 is closely firm on lamina tecti 1. Similarly, the plurality of terminal injection molding via holes 30 of the second electrode terminal 3, the plurality of sealing parts injection molding via holes 90 of the second sealing part 9, and the plurality of top cover plate injection molding via 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 colloid 70 formed on the second fixing part 7 can sequentially penetrate from top to bottom, and the second electrode terminal 3 is tightly and stably assembled on the top cover plate 1.
The first electrode terminal 2 and the second electrode terminal 3 are respectively and fixedly connected to the top cover plate 1 by using a plurality of first colloids 60 formed on the first fixing member 6 and a plurality of second colloids 70 formed on the second fixing member 7, the explosion-proof valve 41, the third sealing member 43 and the metal member 44 are respectively and fixedly connected to the bottom surface of the top cover plate 1 by using a plurality of third colloids 420 formed on the third fixing member 42, and the first electrode terminal 2 and the second electrode terminal 3 are respectively reinforced on the top cover plate 1 by using the first connecting sheet 24 and the second connecting sheet 34, so that an integrated sealing structure is formed. Therefore, the sealing performance 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 among 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 first electrode terminal 2 and the second electrode terminal 3 have the same structure, and the second electrode terminal 3 is taken as an example to be described below, 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 protruded on the lower end surface of the lower terminal plate 31, and a plurality of terminal injection via holes (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, oval, irregular, etc., but are not limited to these shapes.
In the present embodiment, the lower terminal plate 31 of the second electrode terminal 3 is made of a copper-aluminum composite material, specifically, is 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.
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 plate 1, a terminal lead-out hole 12 for leading out the terminal protrusion 33 is formed on the two mounting locations 11, a top cover plate sinking portion 13 is formed at the periphery of the terminal lead-out hole 12, the plurality of top cover plate injection molding through holes 10 are uniformly distributed on the top cover plate sinking portion 13, and the first sealing member 8 and the second sealing member 9 are respectively disposed on the top cover plate 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 sealing member 9 and the top cover plate depressed portion 13 are closely attached together.
In order to improve the stability of the combination between the lower terminal plate of the first electrode terminal 2 and the first sealing member 8, in the embodiment, a sealing member through hole 81 is formed in the middle of the first sealing member 8 for the terminal protrusion of the first electrode terminal 2 to pass through, a plurality of positioning cylinders 82 are protruded from the first sealing member 8 and located at the periphery of the sealing member through hole 81, a plurality of positioning holes 21 are formed in the lower terminal plate of the first electrode terminal 2 for the positioning cylinders 82 to be inserted into, and after the first sealing member 8 is assembled to 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 for positioning in a matching manner, so as to prevent the first sealing member 8 and the first electrode terminal 2 from rotating, thereby achieving the tight combination between the first sealing member 8 and the first electrode terminal 2 and improving the stability of the combination between the first.
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 is formed in the middle of the second sealing member 9 for the terminal protrusion 33 of the second electrode terminal 3 to pass through, a plurality of positioning cylinders 92 are protruded from the second sealing member 9 and located at the periphery of the sealing member through hole 91, a plurality of positioning holes 35 are formed in the lower terminal plate 31 of the second electrode terminal 3 for the positioning cylinders 92 to be inserted into, 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 for positioning in a matching manner, so as to prevent the second sealing member 9 and the second electrode terminal 3 from rotating, so as to achieve tight coupling between the second sealing member 9 and the second electrode terminal 3, and improve the coupling stability of the two members.
Meanwhile, in order to improve the combination stability of the first sealing element 8 and the top cover plate 1, in this embodiment, a plurality of top cover plate special-shaped grooves 14 are formed on the inner wall of the terminal leading-out hole 12, a sealing element flange 83 inserted into the terminal leading-out hole 12 is convexly arranged on the inner wall of the sealing element through hole 81 in a downward direction, and a plurality of sealing element special-shaped convex blocks clamped into the top cover plate special-shaped grooves 14 are formed on the outer side of the sealing element flange 83. When the first electrode terminal 2 assembled with the first sealing member 8 is assembled on the top cover plate sinking part 13 of the top cover plate 1, the sealing member special-shaped convex block is clamped in the top cover plate special-shaped groove 14 to be matched and positioned so as to fix the first sealing member 8 and prevent the first sealing member 8 from rotating, the first sealing member 8 is tightly combined with the top cover plate 1, and the combination stability of the first sealing member 8 and the top cover plate 1 is improved. Therefore, when the first electrode terminal 2 and the first sealing member 8 are mounted to the top cover plate 1, the phenomenon that the center position of the second injection hole is displaced due to sequential folding is prevented.
Similarly, a sealing member flange 93 inserted into the terminal lead-out hole 12 is provided on the inner wall of the sealing member through hole 91 in a downwardly protruding manner, and a plurality of sealing member shaped projections which are engaged into the top cover plate shaped grooves 14 are formed on the outer side of the sealing member flange 93. When the second electrode terminal 3 assembled with the second sealing member 9 is assembled on the top cover plate sinking part 13 of the top cover plate 1, the sealing member special-shaped convex block is clamped in the top cover plate special-shaped groove 14 to be matched and positioned so as to fix the second sealing member 9 and prevent the second sealing member 9 from rotating, so that the second sealing member 9 is tightly combined with the top cover plate 1, and the combination stability of the two is improved. Therefore, when the second electrode terminal 3 and the second sealing member 9 are mounted to the top cover plate 1, the phenomenon that the center position of the second injection hole is displaced due to sequential folding is prevented.
Therefore, when the first electrode terminal 2 and the first sealing member 8, and the second electrode terminal 3 and the second sealing member 9 are mounted to the top cover plate 1, the phenomenon that the center positions of injection molding through holes are displaced due to sequential folding is prevented. Meanwhile, the first electrode terminal 2 is insulated from the top cap plate 1 by the first sealing member 8, and the second electrode terminal 3 is insulated from the top cap plate 1 by the second sealing member 9.
In the present embodiment, two insulation support through holes 51 corresponding to the terminal lead-out holes 12 one to one are formed on the lower insulation support 5, and a plurality of insulation support special-shaped grooves 52 are formed on the periphery of the insulation support through holes 51; a plurality of fixing piece special-shaped convex blocks (61, 71) clamped in the insulating support special-shaped grooves 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 glue bodies 60 are correspondingly connected with the fixing part special-shaped bumps 61 on the first fixing part 6, and the second glue bodies 70 are correspondingly connected with the fixing part special-shaped bumps 71 on the second fixing part 7. When the first fixing member 6 is injection molded, the first colloid 60 and the fixing member special-shaped protrusion 61 are integrally molded, and the fixing member special-shaped protrusion 61 is molded in the insulating support special-shaped groove 52, so that the lower insulating support 5 is connected to the bottom surface of the top cover plate 1 through the first fixing member 6 by the matching connection of the fixing member special-shaped protrusion 61 and the insulating support special-shaped groove 52. Similarly, when the second fixing element 7 is injection molded, the second glue body 70 and the fixing element special-shaped protrusion 71 are integrally molded, and the fixing element special-shaped protrusion 71 is molded in the insulating support special-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 element 7 by the matching connection of the fixing element special-shaped protrusion 71 and the insulating support special-shaped groove 52.
In order to improve the stability of the combination of the lower insulating support 5 and the top cover plate 1, in this embodiment, a plurality of positioning protruding columns 53 are arranged on the lower insulating support 5, and a plurality of positioning grooves for the positioning protruding columns 53 to be clamped into are formed at the bottom of the top cover plate 1. The lower insulating support 5 is more stably limited on the bottom surface of the top cover plate 1 by combining the positioning convex column 53 and the positioning groove.
In the present embodiment, a first through hole 241 through which the terminal protrusion of the first electrode terminal 2 passes is formed on the first connection piece 24, and a second through hole 242 and a first U-shaped side groove 243 are also formed on the first connection piece 24. The first connecting piece 24 may be made of aluminum, and the first connecting piece 24 is an aluminum integrated structure.
A third through-hole 341 through which the terminal protrusion 33 of the second electrode terminal 3 passes is formed at the second connecting piece 34, and a second U-shaped side groove 342 is also formed at the second connecting piece 34. The second connecting piece 34 may be made of copper, and the second connecting piece 34 is an integral structure of copper.
In this embodiment, an explosion-proof valve mounting hole 17 is formed in the top cover plate 1, an annular mounting groove 18 located at the periphery of the explosion-proof valve mounting hole 17 is formed in the lower end surface of the top cover plate 1, 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 area 411 corresponding to the burst area 411 is formed inside the burst valve 41, a sealing member through hole 431 corresponding to the burst area 411 is formed inside the third sealing member 43, a metal member through hole 441 corresponding to the sealing member through hole 431 is formed inside the metal member 44, a burst valve vent hole 421 corresponding to the metal member through hole 441 is formed on the third fixing member 42, and a through hole 54 through which the third fixing member 42 passes is formed on the lower insulating bracket 5. The blasting area 411, the sealing element through hole 431, the metal piece through hole 441, the explosion-proof valve through hole 421 and the through hole 54 are longitudinally arranged in a one-to-one correspondence manner. When the pressure in the battery reaches the explosion-proof valve 41 explosion-starting pressure value, the air can directly communicate with the outside through the explosion-proof valve air hole 421, the through hole 54, the explosion area 411, the sealing element through hole 431 and the explosion area 411, and the air can quickly escape to prevent the high-pressure explosion in the battery box.
In this embodiment, an inner annular flange 171 and an outer annular flange 172 located at the periphery of the explosion-proof valve mounting hole 17 are formed on the upper end surface of the top cover plate 1, an annular groove 173 is formed between the inner annular flange 171 and the outer annular flange 172, and a plurality of connecting injection molding through holes 16 on the top cover plate 1 are uniformly distributed on the annular groove 173.
As for the combination manner of the third fixing element 42 and the lower insulating support 5, in this embodiment, a plurality of special-shaped slots 422 located at the periphery of a plurality of third colloids 420 are formed on the third fixing element 42, and a plurality of special-shaped blocks 55 inserted into the special-shaped slots 422 are formed on the inner wall of the through hole 54 of the lower insulating support 5. The third fixing member 42 is tightly combined with the lower insulating bracket 5 by matching the plurality of special-shaped blocks 55 with the plurality of special-shaped slots 422.
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), and the connection injection molding via (16,410,430,440) may be, but are not limited to, circular, square, polygonal, oval, irregular, and the like.
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 support 5, a plurality of fastening holes 56 are formed on the lower insulating support 5, and a plurality of elastic fastening hooks 451 hooked into the fastening holes 56 are formed on the explosion-proof valve protection cover 45. The elastic hook 451 hooks into the clamping hole 56, so that the explosion-proof valve protection cover 45 is stably connected with the lower insulating bracket 5.
And simultaneously, explosion-proof valve safety cover 45 upper surface ring is equipped with the little boss 452 of several, and is formed with the several safety cover perforation 453 that is located the little boss 452 inboard of several on this explosion-proof valve safety cover 45 upper surface, when the battery internal pressure reaches explosion-proof valve 41 pressure value that initiates, inside high-pressure gas can follow the perforation 453 of safety cover and get into explosion-proof valve bleeder vent 421, through hole 54, blast area 411, sealing member through-hole 431 and blast area 411 are direct and outside through, quick disappointing, the explosion takes place for the high pressure in the prevention battery box.
In the present embodiment, the shape of the small boss 452 and the boot penetration hole 453 may be circular, square, polygonal, elliptical, irregular, etc., but is not limited thereto.
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.
At the same time, at least one upper liquid injection hole 19 is formed on the top cover plate 1, and at least one lower liquid injection hole 57 corresponding to the upper liquid injection hole 19 is formed on the lower insulating support 5.
In the present embodiment, the first fixing member 6, the second fixing member 7, the third fixing member 42, the lower insulating support 5, and the explosion-proof valve protection cover 45 are all integrally formed of PPS, PSU, or nanomaterial, but the material is not limited to these materials.
An embodiment of the present invention also provides a secondary battery, as shown in fig. 4, including:
a housing 200 having an opening 2001 at an upper end thereof;
an electrode assembly accommodated in the case 200;
the cap assembly 100 covers the opening 2001 of the case 200, and the cap assembly 100 seals the electrode assembly in the case 200.
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 (12)
1. An injection molding assembly method of a secondary battery top cap assembly is characterized by comprising the following steps:
(1) the following components were prepared: the explosion-proof structure comprises a top cover plate, a first electrode terminal, a second electrode terminal, a first sealing element, a second sealing element, an explosion-proof structure, a lower insulating support, a first connecting sheet and a second connecting sheet;
(2) assembling a lower insulating support on the bottom surface of the top cover plate;
(3) assembling a first sealing member to a bottom surface of the first electrode terminal, and then, assembling the first electrode terminal assembled with the first sealing member to an upper surface of the cap plate; meanwhile, a second sealing member is mounted on a bottom surface of the second electrode terminal, and then, the second electrode terminal mounted with the second sealing member is mounted on an upper surface of the cap plate;
(4) assembling the explosion-proof structure on the bottom surface of the top cover plate;
(5) after the assembly, the whole body is placed in a mold, then an injection molding process is carried out, a first fixing piece is formed on the top cover plate and corresponds to the position of 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 support 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 support into a whole; meanwhile, the explosion-proof structure and the top cover plate are molded into a whole by injection;
(6) assembling a first connecting sheet on the bottom surface of the first electrode terminal, assembling a 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.
2. An injection molding assembly method of a secondary battery top cap assembly according to claim 1, wherein in the step (1), the explosion-proof structure includes an explosion-proof valve, a third sealing 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 piece 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.
3. An injection molding assembly method of a secondary battery top cap assembly according to claim 2, wherein the step (4) further comprises: after the first fixing piece, the second fixing piece and the third fixing piece are completed through injection molding, the explosion-proof valve protective cover is assembled at the bottom of the lower insulating support and below the third fixing piece, and after the assembly is completed, the explosion-proof valve protective cover is hooked on the lower insulating support.
4. A secondary battery top cap assembly obtained by performing the injection assembling method according to any one of claims 1 to 3, comprising:
the top cover plate is provided with a plurality of top cover plate injection molding through holes;
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, and 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;
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 element arranged below the explosion-proof valve and a metal piece arranged below the third sealing element, and a plurality of connecting injection molding through holes are respectively formed in the top cover plate, the explosion-proof valve, the third sealing element and the metal piece;
a lower insulating support disposed below the top cover plate;
the first fixing piece is arranged on the top cover plate, and a plurality of first colloids 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;
the second fixing piece is arranged on the top cover plate, and a plurality of second colloids formed on the second fixing piece sequentially penetrate 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 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 connecting injection molding through holes of the metal piece, the third sealing piece, 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;
a first connecting piece 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.
5. The secondary battery top cap assembly of claim 4, wherein 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 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 through holes on the first electrode terminal and the second electrode terminal are uniformly distributed on the lower terminal plate.
6. The secondary battery top cap assembly according to claim 5, wherein the lower terminal plate of the second electrode terminal is made of copper-aluminum composite.
7. The secondary battery top cap assembly of claim 5, 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 are uniformly distributed on the top cap plate sinking portion, and the first sealing member and the second sealing member are respectively disposed on the top cap plate sinking portions on the two mounting locations.
8. The secondary battery top cap assembly according to claim 7, wherein a sealing member penetration hole through which the terminal protrusion passes is formed at a central portion of the first sealing member, a plurality of positioning cylinders are protruded at an outer periphery of the sealing member penetration hole on the first sealing member, and a plurality of positioning holes into which the positioning cylinders are inserted are formed on the lower terminal plate; the terminal lead-out hole is characterized in that a plurality of top cover plate special-shaped grooves are formed in the inner wall of the terminal lead-out hole, a sealing element flange inserted into the terminal lead-out hole is arranged on the inner wall of the sealing element through hole in a downward protruding mode, a plurality of sealing element special-shaped convex blocks clamped into the top cover plate special-shaped grooves are formed in the outer side of the sealing element flange, and the second sealing element is the same as the first sealing element in structure.
9. The secondary battery top cap assembly according to claim 7, wherein two insulating holder through holes corresponding one-to-one to the terminal lead-out holes 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 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; a plurality of positioning convex columns are arranged on the lower insulating bracket, and a plurality of positioning grooves for the positioning convex columns to be clamped into are formed at the bottom of the top cover plate; a first through hole through which the terminal protrusion of the first electrode terminal passes is formed on the first connection piece, and a second through hole and a first U-shaped side groove are also formed on the first connection piece; a third through hole through which the terminal protrusion of the second electrode terminal passes is formed on the second connection piece, and a second U-shaped side groove is also formed on the second connection piece.
10. The secondary battery top cap assembly according to claim 4, wherein an explosion-proof valve mounting hole is formed on the top cap 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 cap plate, 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 mounting hole of the explosion-proof valve is formed on the inner side of the explosion-proof valve, a sealing element through hole corresponding to the blasting area is formed on the inner side of the third sealing element, a metal element through hole corresponding to the sealing element through hole is formed on the inner side of the metal element, an explosion-proof valve air hole corresponding to the metal element through hole is formed on the third fixing element, and a through hole for the third fixing element to penetrate through is formed on the lower insulating support.
11. The secondary battery cap assembly according to claim 12, wherein an inner annular flange and an outer annular flange are formed at the upper end surface of the 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 connecting injection molding through holes on the cap plate are uniformly distributed on the annular groove.
12. The secondary battery top cover assembly according to claim 4, wherein a plurality of special-shaped clamping grooves are formed on the third fixing member and positioned at the periphery of a plurality of third colloids, and a plurality of special-shaped clamping blocks clamped in the special-shaped clamping grooves are formed on the inner wall of the through hole of the lower insulating support; the explosion-proof structure also comprises an explosion-proof valve protective cover which is arranged below the third fixing piece and is hooked on the lower insulating bracket, a plurality of clamping holes are formed on the lower insulating bracket, and a plurality of elastic clamping hooks which are hooked into the clamping holes are formed on the explosion-proof valve protective cover; the explosion-proof valve protective cover is characterized in that a plurality of small bosses are annularly arranged on the upper surface of the explosion-proof valve protective cover, and a plurality of protective cover through holes located on the inner sides of the small bosses are formed in the upper surface of the explosion-proof valve protective 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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| 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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Cited By (1)
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| 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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