CN113410554B - Power battery top cover and power battery - Google Patents
Power battery top cover and power battery Download PDFInfo
- Publication number
- CN113410554B CN113410554B CN202110641602.5A CN202110641602A CN113410554B CN 113410554 B CN113410554 B CN 113410554B CN 202110641602 A CN202110641602 A CN 202110641602A CN 113410554 B CN113410554 B CN 113410554B
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- China
- Prior art keywords
- convex part
- plate body
- top cover
- cladding
- power battery
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- 238000005253 cladding Methods 0.000 claims abstract description 36
- 238000002955 isolation Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000012946 outsourcing Methods 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a power battery top cap, is including being equipped with fenestrated apron, utmost point post and with utmost point post integrated into one piece is fixed in insulating body in the fenestrate, insulating body will utmost point post with the apron realizes the electric isolation, the apron includes the plate body, be equipped with the fixed part on the plate body, the fenestrate runs through the fixed part, the plate body orientation the fenestrate extends to form and encircles the interior convex part of fenestrate periphery, the upper surface of interior convex part is less than the surface of plate lateral surface, the lower surface of interior convex part is higher than the surface of plate internal lateral surface, the utmost point post including expose in connecting portion, contact portion of the external both sides of plate body and from outside extension formation's between connecting portion and the contact portion outer portion, insulating body includes outsourcing portion, from the outsourcing portion outside extends to the intermediate level between the outer portion with interior convex part and from the interior cladding of the inside of the outside extension cover of intermediate level is inboard. The application also comprises a power battery.
Description
Technical Field
The application relates to the field of power batteries, in particular to a power battery top cover and a power battery.
Background
The power battery comprises a plurality of battery cells, a converging assembly for connecting the battery cells in parallel, and a pair of poles electrically connected with the converging assembly and transmitting electric energy. The power battery is internally provided with liquid substances such as electrolyte and the like, the tightness of the power battery needs to be maintained, and the power battery also comprises a shell and a top cover for sealing the shell, wherein the pole is fixed on the top cover and a cover plate of the top cover needs to be kept electrically isolated. The existing power battery top cover generally comprises a cover plate provided with at least two mounting holes and a pole column fixed in each mounting hole, wherein the pole column is made of copper or aluminum materials, the pole column is fixed on the cover plate for ensuring that the pole column is fixed on the cover plate, the pole column is generally fixed by spot welding after being respectively arranged in the mounting holes, then the pole column is further fixed to form an electric isolation layer by injection molding, and at least one of the pole column is sleeved with a sealing ring so as to clamp the sealing ring between the pole column and the cover plate, so that a better sealing effect is achieved. The manufacturing process is complex and the manufacturing cost is high.
Disclosure of Invention
In view of this, it is necessary to provide a power battery top cover and a power battery that are low in manufacturing cost and stable in performance.
In order to solve the technical problems, the application provides a top cover of a power battery, which comprises a cover plate provided with a perforation, a pole and an insulating body for integrally forming and fixing the pole in the perforation, wherein the insulating body is used for realizing electric isolation between the pole and the cover plate, the cover plate comprises a plate body, a fixing part is arranged on the plate body, the perforation penetrates through the fixing part, the plate body extends towards the perforation to form an inner convex part surrounding the periphery of the perforation, the upper surface of the inner convex part is lower than the surface of the outer side surface of the plate body, the lower surface of the inner convex part is higher than the surface of the inner side surface of the plate body, the pole comprises a connecting part exposed to the inner side and the outer side of the plate body, a contact part and an outer convex part formed by extending outwards from between the connecting part and the contact part, the outer diameter of the outer convex part is larger than the inner diameter of the perforation, the insulating body comprises a part covering the outer side of the fixing part, an outer convex part extending from the outer side of the middle layer to the inner side of the middle layer, and an outer cladding layer extending from the inner side of the outer convex part to the inner side of the outer cover.
Preferably, the inner protrusion extends from the middle of the plate body toward the through hole, and the inner protrusion is recessed with respect to both the outer side surface and the inner side surface of the plate body.
Preferably, the outer periphery of the upper side of the inner convex part is recessed from the outer side surface of the plate body to form a recessed edge surrounding the inner convex part, the inner side surface of the plate body forms a bonding area at the edge of the inner convex part, the upper surface of the recessed edge is positioned between the outer side surface of the plate body and the upper surface of the inner convex part, and the width of the upper surface of the inner convex part is larger than that of the lower surface of the inner convex part.
Preferably, the inner convex part is provided with a plurality of notches, the position of the outer convex part corresponding to the notch of the inner convex part is provided with a plurality of clearance parts, and the clearance parts and the notches are overlapped in the vertical direction at least partially to form a plastic flow channel.
Preferably, a plurality of protruding pieces are formed between the adjacent clearance parts, a plurality of through holes penetrating through the inner protruding parts are further formed between the gaps, and the through holes correspond to the clearance parts to form plastic flow channels.
Preferably, the outer cladding of the insulating body is wrapped on the upper surface of the outer protruding part and the upper side of the concave edge, and the outer cladding protrudes upwards out of the outer side surface of the plate body; the middle layer is filled on the upper surface of the inner convex part and is positioned between the inner convex part and the outer convex part to realize electric isolation between the inner convex part and the outer convex part; the outer cladding layer wraps the lower surface of the inner convex part, the outer peripheral surface of the connecting part and the bottom surface of the bonding area.
Preferably, the pole further comprises a buried portion between the outer protruding portion and the connecting portion, the outer diameter of the connecting portion is smaller than the outer diameter of the buried portion, the intermediate layer comprises a horizontal portion between the inner protruding portion and the outer protruding portion and a vertical portion extending downward from the inner side of the horizontal portion and between the inner edge of the inner protruding portion and the outer peripheral surface of the buried portion; the inner cladding comprises an inner cladding body filling the bottom surface of the embedded part at the periphery of the connecting part, the bottom surface of the inner convex part and the bottom surface of the combining area, and a blind hole embedded part filling the blind hole.
Preferably, a first accommodating space for accommodating the outer protruding portion is formed between the outer cladding and the intermediate layer, a second accommodating space for accommodating the inner protruding portion is formed between the intermediate layer and the inner cladding, and the outer cladding, the intermediate layer and the inner cladding of the insulating body are of an integral structure.
Preferably, the insulating body is made of modified PPS material, and the area where the cover plate, the polar post and the insulating body are combined is subjected to nano etching hole treatment so as to form a plurality of nano micropores on the metal surface, so that plastic materials enter the nano micropores to realize better binding force and sealing performance.
In order to solve the technical problems, the application further comprises a power battery, a plurality of battery cells and the top cover, wherein the battery cells are arranged in the housing, the top cover is covered on the housing and connects the battery cells together, positive and negative pole columns are arranged on the top cover, and the battery cells are connected to the positive and negative pole columns in a serial connection mode.
According to the power battery top cover and the power battery, the pole with the integrated structure is adopted, the pole can be molded through a stamping process in the structural design, the manufacturing difficulty is reduced, meanwhile, the pole is fixed on the fixing part of the cover plate only through plastic, the technical problem that an existing top cover needs to be internally provided with a sealing ring is solved, the pole structure is complex is solved, the insulating body is integrally molded to form an outer cladding layer and an inner cladding layer which are respectively wrapped and fixed on the upper side and the lower side of the cover plate, and an intermediate layer which is used for connecting the outer cladding layer and the inner cladding layer into a whole, so that the pole and the cover plate are electrically isolated, firmly combined and fixed, and sealed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a perspective view of a power cell of the present application;
FIG. 2 is a perspective view of the power cell top cover of the present application;
FIG. 3 is an exploded perspective view of the power cell top cover of the present application;
FIG. 4 is an enlarged partial view of the cover plate of the power cell top cover of the present application, from a top-down perspective;
FIG. 5 is an enlarged view of a portion of the cover plate of the power cell top cover of the present application, from a bottom-up perspective;
FIG. 6 is a perspective view of a pole of the power cell top cover of the present application;
FIG. 7 is another perspective view of the pole of the power cell top cover of the present application at an alternative angle;
fig. 8 is a perspective view of an insulative housing of a power cell top cap of the present application;
FIG. 9 is a cross-sectional view taken along the dashed line B-B of FIG. 8;
fig. 10 is a cross-sectional view taken along the line A-A of fig. 2.
Description of the reference numerals
A housing-10; a top cover-A; a cover plate-20; fixing parts-21, 22; perforation-211; inner convex portion-212; notch-2121; through-hole-2122; binding region-213; blind hole-2131; recessed edge-214; explosion-proof port-23; a liquid injection hole-24; a plate body-25; an outer side surface-251; inner side-252; a pole-30; a contact portion-31; an outer flange portion-32; upper surface-321; a lower surface-322; a tab-323; a clearance portion-324; an embedded part-33; a connection portion-34; column-35; an insulating body-40; an outer cladding layer-41; an intermediate layer-42; inner cladding-43; a first accommodation space-411; covering the end edges-412; horizontal portion-421; vertical portion-422; a second accommodation space-423; an inner bag body-431; inner wrap end-432; blind hole embedded part-433; a connecting sheet-50; a welding plate-51; drainage connection end-52; explosion-proof sheet-61; protective membrane-62.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application.
Referring to fig. 1, the power battery of the present application includes a housing 10, a plurality of battery cells (not shown) installed in the housing 10, and a top cover a covering the housing 10 and connecting the battery cells together. The top cover A is provided with an anode and cathode post 30, and the battery cells are connected to the anode and cathode post 30 in a parallel or serial mode.
With continued reference to fig. 2 to 5, the power battery top cover a includes a cover 20 having fixing portions 21, 22, a pole 30 disposed in the fixing portions 21, 22, and an insulating body 40 integrally forming the pole 30 on the cover 20. The cover plate 20 is provided with two fixing parts 21, 22, the pole 30 comprises a negative pole and a positive pole, and the negative pole and the positive pole are respectively fixed in the two fixing parts 21, 22.
The cover 20 has a substantially rectangular plate-like structure, and the cover 20 includes a plate body 25 having an outer side surface 251 and an inner side surface 252, an explosion-proof port 23 formed to vertically penetrate the plate body 25, a liquid injection hole 24, and fixing portions 21, 22. An explosion-proof sheet 61 is welded and fixed on the inner side of the explosion-proof opening 23, and a protective membrane 62 is stuck on the outer side of the explosion-proof opening 23. The filling port 24 is typically sealed with a rubber stopper.
Referring to fig. 4 and 5, the fixing portions 21 and 22 include a through hole 211 formed through the plate 25 and an inner protrusion 212 extending from the plate 25 radially inward of the through hole 211. The inner convex portion 212 is formed to protrude from the middle portion of the plate 25, that is, the thickness of the inner convex portion 212 is smaller than that of the plate 25, the upper surface of the inner convex portion 212 is lower than the outer side 251 of the plate 25, and the bottom surface of the inner convex portion 212 is higher than the inner side 252 of the plate 25. The inner side 252 of the plate 25 is formed with a joint area 213 at the outer periphery of the inner protrusion 212, and the joint area 213 is provided with a plurality of blind holes 2131. The inner convex portion 212 is formed with a plurality of through holes 2122 uniformly, and a plurality of notches 2121 are formed by cutting away portions between adjacent through holes 2122 of the inner convex portion 212.
The outer side 251 of the plate 25 is recessed downward at the edge of the inner protrusion 212 to form a recessed edge 214, and the upper surface of the recessed edge 214 is lower than the outer side 251 of the plate 25 and higher than the upper surface of the inner protrusion 212.
With continued reference to fig. 2 to 9, with particular reference to fig. 6 and 7, the pole 30 includes a post 35, a contact portion 31 formed on the upper surface of the post 35, an outer protrusion 32 protruding from the post 35, a buried portion 33 formed on the lower side of the post 35, and a connection portion 34 formed on the bottom surface of the post 35. The outer diameter of the outer flange 32 is larger than the outer diameter of the contact portion 31, the outer diameter of the contact portion 31 is larger than the outer diameter of the embedded portion 33, and the outer diameter of the embedded portion 33 is larger than the outer diameter of the connecting portion 34. The outer flange 32 is located between the contact portion 31 and the embedded portion 33, and the connecting portion 34 is formed to protrude downward from the embedded portion 33. The outer diameter of the outer flange 32 is larger than the inner diameter of the through hole 211 of the cover plate 20, so that the outer flange 32 is positioned above the inner flange 212 and supported by the inner flange 212.
The outer flange 32 includes an upper surface 321 and a lower surface, and a plurality of protruding pieces 323 are formed on the outer periphery of the outer flange 32 in an outward protruding manner, and a plurality of empty portions 324 are formed between the protruding pieces 323. When the pole 30 is a positive pole, the column 35 is an integral body made of the same metal material, and specifically an aluminum alloy material; when the pole 30 is a negative pole, the column 35 is made of aluminum alloy, the connection portion 34 is made of copper alloy, and the connection portion 34 is fixed to the lower end of the column 35 by friction welding or the like. The connecting piece 50 includes a welding plate 51 welded to the lower side of the connecting portion 34, and a drainage connecting end 5 formed by bending and extending downward from the welding plate 51.
Referring to fig. 8 to 10, the cover 20 and the pole 30 are fixed in an injection mold to form the insulating body 40 by injection molding. Specifically, the pole 30 and the cover 20 are injection molded in a state of being isolated from each other, and the insulator 40 fixes the pole 30 in the fixing portions 21, 22 of the cover 20 after molding; the outer flange 32 of the post 30 and the tab 323 thereon are positioned above the inner boss 212 of the cover plate 20 so as to maintain a non-contact state, such that an isolation gap exists between the outer flange 32 and the inner boss 212. Meanwhile, the clearance portion 324 of the outer flange 32 corresponds to the notch 2121 on the inner protrusion 212. The tab 323 of the outer flange 32 is located within the interior of the inner protrusions 212 without going beyond the interior protrusions 212, and the buried portion 33 is located within the perforations 211 between the interior protrusions 212. The outer diameter of the embedded portion 33 is smaller than the inner diameter of the penetration hole 211, and the contact portion 31 and the connection portion 34 are exposed to the upper and lower surfaces of the cap plate 20, respectively.
The insulating body 40 includes an outer cladding 41, an intermediate layer 42 extending inward from the lower side of the outer periphery of the outer cladding 41, an inner cladding 43 extending downward from the inner side edge of the intermediate layer 42 and then extending outward, and a post hole 44 penetrating the insulating body 40. The pole 30 is encased within the pole bore 44.
The outer cladding 41 covers the outer side of the inner protrusion 212 of the cover 20, the recessed edge 214, and the upper surface 321 of the outer protrusion 32 of the post 30. A first accommodating space 411 for accommodating the outer flange 32 of the pole 30 and the tab 323 thereon is formed between the outer cladding 41 and the intermediate layer 42, and an upper inner edge of the outer cladding 41 covers the upper surface 321 of the outer flange 32 and forms a cover end edge 412, wherein the thickness of the cover end edge 412 is smaller than that of the outer cladding 41.
The middle layer 42 is formed by extending from the lower edge of the outer cover 41 to the post hole 44 and then extending downward at the edge of the post hole 44, and includes a horizontal portion 421 and a vertical portion 422, where the horizontal portion 421 fills the space between the bottom surface 322 of the outer flange 32 and the upper surface of the inner protrusion 212. The vertical portion 422 fills the space between the buried portion 33 and the inner edge of the inner convex portion 212 to achieve electrical isolation. A second accommodating space 423 for accommodating the inner convex portion 212 is formed between the inner cladding 43 and the intermediate layer 42, the inner side of the inner cladding 43 covers the bottom surface of the embedded portion 33 on the outer periphery of the connecting portion 34 and forms an inner cladding body 431, the outer side of the inner cladding body 431 extends outwards to form an inner cladding end 432 wrapped on the bonding region 213 of the inner side surface 252 of the plate 25, and a plurality of blind hole embedded portions 433 for filling the blind holes 2131 are formed on the inner cladding end 432. The mutual retention of the blind hole 2131 and the blind hole insertion portion 433 can increase the binding force between the insulating body 40 and the plate 25. The through hole 2122 of the inner convex portion 212 is also filled with plastic to enhance the coupling force.
When the insulating body 40 is injection molded, the clearance portion 324 of the outer flange 32 of the pole 30 corresponds to the notch 2121 of the inner protrusion 212, so that the plastic can smoothly flow through the clearance portion 324 and the notch 2121.
The insulating body 40 is made of PPS modified plastic with high strength and strong binding force, and the positions of the inner protrusion 212, the outer protrusion 32, and the like, which are combined with the plastic, can be subjected to nano etching hole treatment to form a plurality of nano micropores, so that the plastic can enter the nano micropores to form a product with strong binding force and good sealing property.
According to the power battery top cover and the power battery, the pole 30 with the integrated structure is adopted, the pole 30 can be formed through a stamping process in structural design, so that the manufacturing difficulty is reduced, meanwhile, the pole 30 is fixed on the fixing parts 21 and 22 of the cover plate 20 only through plastic, and the technical problems that a sealing ring is required to be built in an existing top cover and the pole structure is complex are solved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples only represent preferred embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The utility model provides a power battery top cap, including be equipped with perforation apron, utmost point post and with utmost point post integrated into one piece is fixed in the insulator in the perforation, the insulator will utmost point post with the apron realizes electric isolation, characterized in that, the apron includes the plate body, be equipped with fixed part on the plate body, the perforation runs through fixed part, the plate body extends towards the perforation and forms the interior convex part that encircles the perforation periphery, the upper surface of interior convex part is less than the surface of plate body lateral surface, the lower surface of interior convex part is higher than the surface of plate body medial surface, the utmost point post includes exposing connecting portion, contact and from connecting portion and the outer part that extends outward between the contact of outer part, the external diameter of outer part is greater than the internal diameter of perforation makes the outer part be located at least partially above the interior convex part, the insulator includes the cover with the fixed part outside, from the outer side of portion outside to the intermediate layer and the outer cover outside the outer cover is fixed to the inner side of outer cover outside the intermediate layer;
an isolation gap exists between the outer convex part and the inner convex part, a plurality of gaps are formed in the inner convex part, a plurality of clearance parts are arranged at the positions, corresponding to the gaps of the inner convex part, of the outer convex part, and the clearance parts and the gaps are at least partially overlapped in the vertical direction to form a plastic flow channel;
a plurality of protruding pieces are formed between the adjacent clearance parts, a plurality of through holes penetrating through the inner protruding parts are further formed between the gaps, and the through holes correspond to the clearance parts to form plastic flow channels.
2. The power cell top cover according to claim 1, wherein the inner protrusion is formed by extending from the middle of the plate body toward the through hole, and the inner protrusion is recessed with respect to both the outer side surface and the inner side surface of the plate body.
3. The power cell top cover of claim 2, wherein the upper outer peripheral edge of the inner protrusion is recessed from the outer side surface of the plate body to form a recessed edge surrounding the inner protrusion, the inner side surface of the plate body forms a bonding area at the inner protrusion edge, the recessed edge upper surface is located between the outer side surface of the plate body and the inner protrusion upper surface, and the width of the inner protrusion upper surface is greater than the width of the inner protrusion lower surface.
4. The power battery top cover according to claim 3, wherein the outer wrapping layer of the insulating body is wrapped on the upper surface of the outer protruding portion and on the upper side of the concave edge, and the outer wrapping layer protrudes upwards to the outer side surface of the plate body; the middle layer is filled on the upper surface of the inner convex part and is positioned between the inner convex part and the outer convex part to realize electric isolation between the inner convex part and the outer convex part; the inner cladding wraps the lower surface of the inner convex part, the outer peripheral surface of the connecting part and the bottom surface of the bonding area.
5. The power cell top cover of claim 4, wherein the pole further comprises a buried portion between the outer flange and the connecting portion, the connecting portion having an outer diameter smaller than an outer diameter of the buried portion, the intermediate layer comprising a horizontal portion between the inner flange and the outer flange and a vertical portion extending downward from inside the horizontal portion between an inner edge of the inner flange and an outer peripheral surface of the buried portion; the inner cladding comprises an inner cladding body filling the bottom surface of the embedded part at the periphery of the connecting part, the bottom surface of the inner convex part and the bottom surface of the combining area, and a blind hole embedded part filling the blind hole.
6. The power cell top cover according to claim 5, wherein a first receiving space for receiving the outer protruding portion is formed between the outer cladding and the intermediate layer, a second receiving space for receiving the inner protruding portion is formed between the intermediate layer and the inner cladding, and the outer cladding, the intermediate layer, and the inner cladding of the insulating body are integrally formed.
7. The power battery top cover of claim 6, wherein the insulating body is made of modified PPS material, and the cover plate and the region where the pole and the insulating body are combined are subjected to nano etching treatment to form a plurality of nano micropores on the metal surface, so that the plastic material enters the nano micropores to achieve better binding force and sealing performance.
8. A power battery, characterized by comprising a shell, a plurality of battery cells installed in the shell, and a top cover as claimed in any one of claims 1-7, wherein the top cover covers the shell and connects the battery cells together, positive and negative poles are arranged on the top cover, and the battery cells are connected to the positive and negative poles in a serial connection mode.
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