WO2023241603A1 - 一种动力电池的安全顶盖 - Google Patents

一种动力电池的安全顶盖 Download PDF

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Publication number
WO2023241603A1
WO2023241603A1 PCT/CN2023/100085 CN2023100085W WO2023241603A1 WO 2023241603 A1 WO2023241603 A1 WO 2023241603A1 CN 2023100085 W CN2023100085 W CN 2023100085W WO 2023241603 A1 WO2023241603 A1 WO 2023241603A1
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WO
WIPO (PCT)
Prior art keywords
pole
ring
groove
insulating
power battery
Prior art date
Application number
PCT/CN2023/100085
Other languages
English (en)
French (fr)
Inventor
陈锦伟
唐六生
杜秋文
陈蓉周
Original Assignee
宜宾长盈精密技术有限公司
深圳市长盈精密技术股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宜宾长盈精密技术有限公司, 深圳市长盈精密技术股份有限公司 filed Critical 宜宾长盈精密技术有限公司
Publication of WO2023241603A1 publication Critical patent/WO2023241603A1/zh

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Classifications

    • 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
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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

Definitions

  • the invention relates to the technical field of power batteries, and in particular to a safety top cover for a power battery.
  • a power battery includes a number of battery cells, a bus assembly that connects the battery cells in parallel, and a pair of poles that electrically connect the bus assembly and transmit electrical energy.
  • the poles, covers and plastic parts of the power battery need to be electrically isolated and sealed.
  • the seal is usually placed on the underside of the cover plate and is clamped and fixed by a welding ring.
  • the pole is also pre-fixed through the welding ring.
  • the welding ring does not secure the pole.
  • the pole is completely fixed, making it difficult to accurately locate the pole during subsequent injection molding, and may cause the pole to shift and thereby reduce the sealing performance of the seal.
  • the object of the present invention is to provide a safety top cover for a power battery to solve the problems of difficult pole positioning and low sealing performance in the prior art.
  • the present invention provides a safety top cover for a power battery, which includes a cover plate, a first pole mounting groove and a second pole mounting groove formed on the cover plate, and is placed on the first pole.
  • the first seal and the first pole in the pole mounting groove, the second seal and the second pole placed in the second pole mounting groove, and the outer edge of the first pole mounting groove are integrated a first pole pressing ring formed on the cover plate and a second pole pressing ring integrally formed on the cover plate around the outer edge of the second pole mounting groove; the first pole pressing ring
  • Both the pole pressure ring and the second pole pressure ring have an annular body integrally formed on the cover plate around the outer edge of the corresponding installation groove, a pressing portion extending inward from the upper end of the annular body, and a pressing portion formed along the annular body.
  • a first escape part is formed on the side of the pressing part; the first pole and the second pole both include a cylindrical body formed on the outer periphery of the cylindrical body at a position corresponding to the first escape part The positioning convex portion and the second escape portion formed on the cylindrical body corresponding to the position of the pressing portion; when the first pole and the second pole are respectively placed on the first pole and installed After the slot and the second pole are installed in the slot, the positioning protrusion and the pressing portion at least partially overlap on the horizontal projection plane.
  • this application also provides a safety top cover for a power battery, which includes a cover plate, a first pole mounting groove formed on the cover plate, and is placed in the first pole mounting groove.
  • the first seal and the first pole also include
  • the first pole pressure ring is integrally formed on the cover plate around the outer edge of the first pole installation groove; the first pole pressure ring has a first pole pressure ring integrally formed on the cover around the outer edge of the first pole installation groove.
  • the third A pole includes a cylindrical body, a positioning convex portion formed on the outer periphery of the cylindrical body corresponding to the position of the first escape portion, and a third position formed on the cylindrical body corresponding to the position of the pressing portion.
  • this application also provides a safety top cover for a power battery, which includes a cover plate provided with a first pole mounting groove, a first seal placed in the first pole mounting groove, The first pole and the first insulating member isolated between the outer periphery of the first pole and the inner wall of the installation groove, the outer edge of the first pole installation groove integrally extends upward to form a first pole pressure ring, The first pole mounting groove extends in the horizontal direction to form an insulating ring groove located below the first pole pressing ring, and the first pole pressing ring has an insulating ring that is integrally formed on the cover around the outer edge of the corresponding mounting groove.
  • the first sealing member is clamped between the lower surface of the pole and the insulating annular groove.
  • An insulating piece is clamped between the inner wall surface of the first pole pressing ring and the outer surface of the first pole. The first insulating piece extends upward out of the outside world and is flush with the surface of the first pole.
  • a pole pressing ring having a pressing portion and a first escape portion is integrally formed on the cover plate, and positioning protrusions that cooperate with the pressing portion and the first escape portion are provided on the first pole and the second pole. and a second escape ring groove, so that when assembling the pole, the pole can be pre-positioned through the cooperation between the pressing part and the second escape part, the first escape part and the positioning convex part, so as to avoid the problem during the injection molding process.
  • the fluidity of the injection molding material causes the pole to shift; at the same time, by arranging the first convex ring and the press-fit ring groove in the installation groove, through the cooperation between the pole body and the first convex ring and the press-fit ring groove, the pole can be
  • the seal is held in the installation groove, eliminating the need for an additional fixing structure for the seal, simplifying the structure of the power battery and improving the reliability of the power battery.
  • the pole pressure ring on the cover adopts an integrated structure, which can reduce the laser welding process and avoid problems such as partial welding, dents or interruptions in the welding seam, and the occurrence of pores during the welding process, thereby further improving the reliability of the power battery.
  • Figure 1 is a schematic structural diagram of a safety top cover of a power battery according to the present invention.
  • Figure 2 is an exploded view of Figure 1.
  • FIG. 3 is a cross-sectional view at the position of the first pole in FIG. 1 .
  • Figure 4 is a top view of the present invention (without insulating parts).
  • FIG. 5 is a view from A-A in FIG. 4 .
  • Figure 6 is an enlarged schematic diagram of position B in Figure 5.
  • FIG. 7 is a schematic structural diagram of the first sealing member and the second sealing member in FIG. 2 .
  • Figure 8 is a structural diagram of the cover plate in Figure 2.
  • Figure 9 is an enlarged structural view of C in Figure 8.
  • FIG. 10 is a longitudinal cross-sectional view of the cover plate of FIG. 8 .
  • Figure 11 is an enlarged structural view of D in Figure 10.
  • Figure 12 is a schematic structural diagram of the first pole and the second pole in Figure 2.
  • FIG. 13 is a schematic structural diagram of the first insulating member and the second insulating member in FIG. 2 .
  • FIG. 14 is a top view of FIG. 13 .
  • FIG. 15 is a view from E-E in FIG. 13 .
  • FIG. 16 is a view from F-F in FIG. 13 .
  • a safety top cover of a power battery in this embodiment includes a cover plate 1, a first pole mounting groove 11a and a second pole mounting groove 11b formed on the cover plate 1 , the first seal 3a and the first pole 2a placed in the first pole mounting groove 11a, the second seal 3b and the second pole 2b placed in the second pole mounting groove 11b .
  • the first pole 2a and the second pole 2b are used to realize the electrical connection between the positive and negative poles of the battery core in the power battery and external electrical components; the first seal 3a is pressed against the first pole and installed.
  • the second seal 3b is pressed between the second pole installation groove 11b and the lower surface of the second pole 2b to achieve the top cover of the power battery. Sealed to prevent electrolyte leakage in the power battery.
  • the first pole 2a and the second pole 2b are insulated and isolated from the cover 1 through a first insulating part 4a and a second insulating part 4b respectively.
  • the first insulating part 4a and the second insulating part 4b are injection molded. Craft formation.
  • a lower insulating piece adapted to the cover plate 1 is formed on the lower surface of the cover plate 1, and a first soft connector electrically connected to the first pole 2a is formed on the lower surface of the lower insulating piece ( (not shown in the figure) and a second soft connector (not shown in the figure) electrically connected to the second pole 2b.
  • the lower surfaces of the first pole 2a and the second pole 2b respectively pass through the first pole.
  • the soft connector and the second soft connector are electrically connected to the positive and negative terminal ears of the battery.
  • the first pole 2a and the second pole 2b are The upper surface is electrically connected to external electrical components.
  • the first pole mounting groove 11a and the second pole mounting groove 11b each have a first mounting hole 111, a first flange 112 and a press-fit ring groove 113.
  • the hole 111 vertically penetrates the cover plate 1 to cooperate with the first convex ring 112 and the press-fit ring groove 113 to install the first seal 3a and the second seal 3b, and to provide the first pole 2a and the second pole.
  • the channel 2b is electrically connected to the positive and negative terminal ears of the battery core.
  • the first flange 112 protrudes upward around the periphery of the first mounting hole 111 to support the corresponding positions of the first seal 3a and the second seal 3b and to cooperate with the corresponding pole to support the first seal 3a and the second sealing member 3b are pressed together; the press-fitting annular groove 113 is formed on the outer periphery of the first convex ring 112 for accommodating the corresponding ends of the first sealing member 3a and the second sealing member 3b.
  • the first sealing member 3a and the second sealing member 3b each include an annular sealing gasket 31 and an inner sealing ring 32 and an outer sealing ring 33 formed on both sides of the annular sealing gasket 31.
  • the lower surface of 31 is supported on the upper surface of the first convex ring 112, and is pressed on the first convex ring 112 through the corresponding pole to achieve sealing of the power battery.
  • the inner sealing ring 32 extends downward from the inner circumference of the annular sealing gasket 31 .
  • the outer diameter of the sealing inner ring 32 is adapted to the inner diameter of the first mounting hole 111 , and the inner sealing ring 32
  • the inner diameter is adapted to the diameter of the corresponding end of the first pole 2a and the second pole 2b, so that the first pole 2a and the second pole 2b are installed in the first pole installation slot 11a and the second pole installation respectively.
  • the corresponding ends of the first pole 2a and the second pole 2b are inserted into the inner sealing ring 32 and cooperate with the inner wall of the first convex ring 112 to squeeze the inner sealing ring 32; the outer sealing ring 33 Extending downward from the outer periphery of the annular sealing gasket 31 , the inner diameter of the sealing outer ring 33 matches the inner diameter of the press-fitting annular groove 113 and the outer diameter of the sealing outer ring 33 matches the press-fitting annular groove 113 .
  • the outer diameter of 113 is adapted so that the lower end of the sealing outer ring 33 can be press-fitted in the press-fitting annular groove 113, so that the first seal 3a and the first sealing member 3a are
  • the installation of the second seal 3b is positioned so that the first seal 3a and the second seal 3b can be quickly installed during assembly; at the same time, the height of the seal outer ring 33 is greater than the depth of the press-fit ring groove 113. Therefore, when the sealing outer ring 33 is press-fitted in the press-fit ring groove 113, it can closely fit the groove bottom of the press-fit ring groove 113 under the pressure of the corresponding pole, thereby improving the reliability of the seal.
  • the outer sealing ring 33 , the inner sealing ring 32 and the annular sealing gasket 31 form a buckling groove 34 with an opening facing downward for fastening with the first convex ring 112 ; during assembly, the buckling groove 34 is It is buckled on the first convex ring 112 , the outer sealing ring 33 is press-fitted in the press-fitting annular groove 113 , the inner sealing ring 32 is embedded in the first mounting hole 111 , and the annular sealing gasket 31 It is pressed against the first convex ring 112 and the upper surface is in contact with the lower surface of the corresponding pole, thereby further improving the reliability of the seal.
  • the cover plate 1 surrounds the outer edges of the first pole mounting groove 11a and the second pole mounting groove 11b.
  • the first pole pressure ring 12a and the second pole pressure ring 12b are integrally formed.
  • the first pole 2a cooperates with the first pole pressure ring 12a to press-fit the first seal 3a to the first pole installation.
  • the second pole 2b can cooperate with the second pole installation groove 11b to press the second seal 3b between the second pole installation groove 11b and the second pole 2b. between to achieve the sealing of the power battery.
  • the first pole pressing ring 12a and the second pole pressing ring 12b are preferably integrally stamped and formed by the cover plate 1 made of aluminum or steel alloy, which can reduce the number of laser welding process steps, and the formed There is no welding seam between the first pole pressing ring 12a, the second pole pressing ring 12b and the cover plate 1, so the reliability is higher.
  • the first pole pressing ring 12a and the second pole pressing ring 12b each have an annular body 121, a pressing portion 122 and a first escape portion 123.
  • the annular body 121 is integrated around the outer edge of the corresponding installation groove.
  • the annular body 121 is formed on the cover plate 1 and protrudes upward to form an accommodation space that can accommodate poles.
  • the pressing portion 122 extends inwardly from the upper end of the annular body 121 , and the first escape portion 123 is formed on the side of the pressing portion 122 along the annular body 121 to prevent the annular body 121 from being blocked.
  • a notch is formed at a position corresponding to the side of the pressing part 122, so that the pressing part 122 and the first escape part 123 can cooperate with the corresponding positions of the first pole 2a and the second pole 2b to make the first pole 2a and the second pole 2b are predetermined to be located in the accommodation space when the top cover is assembled, thereby avoiding the first pole 2a and the second pole 2b from shifting when the first insulator 4a and the second insulator 4b are injection molded. Bit.
  • the pressing part 122 in order to improve the positioning reliability of the first pole 2a and the second pole 2b, includes annular body 121 spaced apart along the circumferential direction of the annular body 121.
  • Each holding block 122a is formed by extending inwardly from the upper end of the annular body 121, and is used for being installed on the corresponding poles of the first pole 2a and the second pole 2b.
  • the first escape portion 123 includes a first escape opening 123a formed between each adjacent two pressing blocks 122a.
  • the inner diameter of the first escape opening 123a is larger than the inner diameter of the pressing block 122a, so as to facilitate assembly during assembly.
  • the corresponding positions of the first pole 2a and the second pole 2b are avoided, so that the first pole 2a and the second pole 2b can be assembled into the corresponding pole installation grooves through the first escape opening 123a. .
  • the first pole 2a and the second pole 2b each include a cylindrical body 21, a positioning protrusion 22 and a second escape portion 23.
  • the diameter of the cylindrical body 21 is smaller than the pressing force.
  • the inner diameter of the block 122a is such that the first pole 2a and the second pole 2b can be installed in the pole installation groove.
  • the first pole 2a and the second pole 2b are made of aluminum, copper or copper-aluminum composite materials to achieve electrical conduction between the power battery cells and external electrical components.
  • the second escape part 23 is formed on the outer periphery of the cylindrical body 21 and corresponds to the position of the first escape part 123.
  • the second escape part 23 is formed on the outer periphery of the cylindrical body 21 and is in contact with the pressure
  • the positions of the holding parts 122 are corresponding to each other, so that when the first pole 2a and the second pole 2b are assembled, the first escape part 123 can avoid the positioning protrusion 22, and at the same time, the second escape part 23 can avoid the positioning protrusion 22.
  • the pressing part 122 is moved out of the way, and then the first pole 2a and the second pole 2b are respectively installed in the first pole installation groove 11a and the second pole installation groove 11b, and then the first pole is 2a and the second pole 2b rotate at an angle so that the positioning protrusion 22 and the pressing part 122 at least partially overlap on the horizontal projection plane, thereby achieving the predetermined positioning of the first pole 2a and the second pole 2b. .
  • the positioning protrusion 22 includes a plurality of positioning protrusions 22a formed on the outer periphery of the cylindrical body 21.
  • the positioning protrusions 22a correspond to the position of the first escape opening 123a, so that the first escape opening 123a Avoid the positioning protrusion 22a;
  • the second escape portion 23 includes a plurality of second escape openings 23a formed on the outer circumference of the cylindrical body 21, and the positions of the second escape openings 23a and the pressing block 122a are Correspondingly and located between each two adjacent positioning protrusions 22a, so that the second escape opening 23a avoids the pressing block 122a.
  • each positioning bump 22a extends outward from a corresponding position on the outer periphery of the cylindrical body 21.
  • the diameter of the positioning bump 22a is smaller than the inner diameter of the first escape opening 123a and larger than the inner diameter of the pressing block 122a.
  • the diameter of the second escape opening 23a is smaller than the inner diameter of the holding block 122a, so that when the first pole 2a and the second pole 2b are assembled, the positioning bump 22a and the first escape opening 123a, The second escape opening 23a and the pressing block 122a cooperate with each other to be assembled in the corresponding pole installation groove, and after installation, the first pole 2a and the second pole are aligned with each other through the cooperation of the positioning protrusion 22a and the pressing block 122a.
  • the pole 2b is pre-positioned.
  • a second convex ring 24 is formed on the outer circumferential surface of the cylindrical body 21 and protrudes outward.
  • the positioning protrusion 22a is formed on the outer circumference of the second convex ring 24 and corresponds to the At the position of the first escape opening 123a, the second escape opening 23a is formed on the outer circumference of the second convex ring 24 and corresponds to between each two adjacent positioning protrusions 22a.
  • the cylindrical body 21 also has a lower connecting portion 25 extending downward from the lower surface of the cylindrical body 21 .
  • the diameter of the lower connecting portion 25 is equal to the inner diameter of the sealing inner ring 32 .
  • the lower connecting portion 25 can be inserted into the inner sealing ring 32 to pass through the first mounting hole 111 and connect to the positive and negative electrode cells of the battery.
  • the lower connection The portion 25 also cooperates with the inner wall of the first convex ring 112 to squeeze the sealing inner ring 32 to improve the reliability of the seal.
  • the cylindrical body 21 also has a self-cylindrical shape
  • the upper surface of the main body 21 protrudes upward to form an upper connecting portion 26.
  • the upper surface of the upper connecting portion 26 is exposed outside the first insulating member 4a and the second insulating member 4b to electrically connect with external electrical components;
  • the upper surface of the upper connecting portion 26 is higher than the upper surfaces of the first insulating member 4a and the second insulating member 4b, so as to prevent the first insulating member 4a and the second insulating member 4b from During the injection molding process, the upper surface of the upper connecting portion 26 is covered.
  • the first pole mounting groove 11a and the second pole mounting groove 11b also have an insulating ring groove 114.
  • the insulating ring groove 114 is formed on Outside the press-fitting ring groove 113, the insulating ring groove 114 is surrounded by the corresponding pole and the pole pressing ring to form an insulating injection molding space 6 for injection molding of insulating materials in the insulating injection molding space 6.
  • the electrical isolation between the cover plate 1 and the first pole 2a and the second pole 2b is achieved.
  • the groove bottom surface of the insulating ring groove 114 is higher than the groove bottom surface of the press-fit ring groove 113 to ensure that the sealing outer ring 33 can be press-fitted in the press-fit ring groove 113 and at the same time, the annular sealing gasket 31 can Higher than the bottom surface of the insulating ring groove 114 , the insulating injection molding space 6 is formed between the insulating ring groove 114 and the outer peripheral surface of the corresponding pole and the inner peripheral surface of the corresponding pole pressure ring.
  • the first insulating member 4a and the second insulating member 4b both include an inner insulating coating layer 41 formed by integral injection molding in the insulating injection molding space 6 and formed on the corresponding pole pressure ring.
  • the upper insulating coating layer 42 on the surface and the outer insulating coating layer 43 formed on the outer peripheral surface of the corresponding pole pressure ring.
  • the inner insulation coating layer 41, the upper insulation coating layer 42 and the outer insulation coating layer 43 are connected in sequence to form a special-shaped insulation groove 44 with an opening downward.
  • the inner wall of the special-shaped insulation groove 44 (ie, the inner insulation coating layer 41, the lower surface of the upper insulation coating layer 42 and the inner peripheral surface of the outer insulation coating layer 43) and the inner peripheral surface and upper surface of the first pole pressure ring 12a and the second pole pressure ring 12b and
  • the outer peripheral surface is contoured to cover the first pole pressing ring 12a and the second pole pressing ring 12b; the inner circumferential surface of the first insulating member 4a and the second insulating member 4b (ie, the inner insulating coating layer 41) and the outer circumferential surfaces of the first pole 2a and the second pole 2b and the outer circumferential surfaces of the first seal 3a and the second seal 3b at the corresponding positions to wrap the first pole pressure
  • the ring 12a and the second pole pressing ring 12b are filled with the insulating injection molding space 6 to electrically isolate the first pole 2a and the second pole 2b from the corresponding first pole pressing ring 12a and the second pole pressing ring 12b.
  • the first insulating member 4a and the second insulating member 4b are injection molded using insulating and corrosion-resistant polymer materials (such as PP, PVC, PS, ABS, PC, etc.). After solidification, the first insulating member 4a and the second insulating member 4b are formed by injection molding. An insulating member 4a and a second insulating member 4b.
  • insulating and corrosion-resistant polymer materials such as PP, PVC, PS, ABS, PC, etc.
  • the inner peripheral surface of the inner insulating coating layer 41 is formed with a positioning concave ring that matches the second convex ring 24 , and the inner peripheral surface of the inner insulating coating layer 41 corresponds to the positioning concave ring.
  • a matching positioning groove is formed at the position of the positioning bump 22a.
  • a first protrusion 41b protruding inward is formed at a position corresponding to the second escape opening 23a; and on the outer peripheral surface of the inner insulating coating layer 41, a position corresponding to the position below the pressing block 122a is formed.
  • a second protrusion 41c protruding outward is formed, and the pressing block 122a is pressed on the upper surface of the second protrusion 41c.
  • the upper insulating coating layer 42 corresponds to the first escape opening.
  • a third protrusion 42a is formed at the position of 123a and is embedded downwardly in the first relief opening 123a and connected with the inner insulation coating layer 41 .
  • a corresponding second mounting hole 51 is formed on the lower insulating plate 5 at a position corresponding to the first mounting hole 111.
  • the size of the second mounting hole 51 is the same as that of the first mounting hole.
  • the hole 111 is adapted to enable the pole assembly to come into contact with the electrolyte within the power battery.
  • an annular boss 52 is formed at the edge of the second mounting hole 51 and extends upward into the first mounting hole 111.
  • the upper surface of the annular boss 52 is in contact with the first mounting hole 111.
  • the lower surface of the sealing inner ring 32 is in contact to further squeeze the sealing member and improve the sealing effect.
  • the lower ends of the first pole 2a and the second pole 2b pass downward through the first mounting hole 111 and the second mounting hole 51 to be electrically connected to the battery tabs.
  • the lower insulating plate 5 is injection molded from plastic material.
  • a number of mounting posts are formed on the upper surface of the lower insulating plate 5.
  • the lower surface of the cover plate 1 is formed at positions corresponding to the mounting posts.
  • There is a one-to-one corresponding mounting slot and the lower insulating plate 5 is fixed and press-fitted to the bottom of the cover plate 1 using an ultrasonic pressing process through the cooperation of the mounting post and the mounting slot.
  • the lower insulating plate 5 can also be fixed to the bottom of the cover plate 1 in other ways, which is not limited in this embodiment.
  • the lower surface of the lower insulating plate 5 is also formed with a pressing block 53 at positions corresponding to the two ends, for pressing and fixing the cells of the power battery.
  • an explosion-proof mechanism 7 is also fixed on the cover 1, which is used to activate the power battery to discharge the internal gas in time when the internal air pressure of the power battery rises to a certain value under extreme circumstances.
  • the explosion-proof mechanism 7 includes an explosion-proof disc 71 fixed on the cover 1 and a protective film 72 fixed on the bottom of the explosion-proof disc 71.
  • an explosion-proof hole 13 is provided on the cover 1 at a position corresponding to the explosion-proof mechanism 7 .
  • the explosion-proof disc 71 is fixedly installed in the explosion-proof hole 13 .
  • the cover plate 1 is also formed with an injection hole 14 that penetrates the cover plate 1 up and down, for injecting electrolyte into the interior of the power battery after the power battery is packaged.
  • the integrally formed cover plate 1 and the injection molded The lower insulating plate 5 is press-fitted and fixed, and the cover plate 1 and the lower insulating plate 5 are placed on a flat surface; then, the first sealing member 3a and the second sealing member 3b are respectively placed in the first pole installation slot 11a and In the second pole mounting groove 11b, the sealing outer ring 33 is press-fitted in the press-fitting annular groove 113, and the sealing inner ring 32 is sleeved on the inner wall of the first mounting hole 111, thereby supporting the lower surface of the annular sealing gasket 31 on the upper surface of the first convex ring 112; then, place the first pole 2a and the second pole 2b above the pole mounting grooves on the corresponding sides, so that the positioning protrusions 22a are correspondingly located at the first escape opening 123a above, the second escape opening 23a is correspondingly located above the holding block 122a, and moves the first pole
  • the cover plate 1 that has completed the pre-positioning of the first pole 2a and the second pole 2b in the injection molding device, and perform injection molding on the insulating accommodation space and the upper surface and outer peripheral surface of the pole pressure ring.
  • the first insulating part 4a and the second insulating part 4b are formed to complete the assembly of the present invention, while simplifying the structure and process, making the operation simple, and having strong practicability.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本发明公开了一种动力电池的安全顶盖，包括盖板、形成于盖板上的第一极柱安装槽及第二极柱安装槽、分别置于对应极柱安装槽的第一极柱和第二极柱，盖板上绕对应安装槽的外缘分别一体成型有极柱压环；极柱压环具有绕对应安装槽外缘一体成型于盖板上的环状本体、自环状本体上端向内延伸形成的压持部以及与压持部间隔设置的第一避让部；第一极柱及第二极柱均包括柱形主体、形成于柱形主体外周分别与压持部和第一避让部对应的第二避让部和定位凸部；当极柱分别置于对应安装槽内后，定位凸部与所述压持部在水平投影面上至少部分重叠，以在动力电池的装配过程中对极柱进行预定位，从而避免极柱移位，提高动力电池的稳定性，且结构简单。

Description

一种动力电池的安全顶盖 技术领域
本发明涉及动力电池技术领域，特别是涉及一种动力电池的安全顶盖。
背景技术
动力电池包括若干电池单体、将所述电池单体并联在一起的汇流组件及电连接所述汇流组件并将电能传输出去的一对极柱。动力电池内部有注入电解液等液态物质，需要保持所述动力电池的密封性，为保持密封性，需对动力电池的极柱、盖板和塑胶件进行电隔离并密封。
现有的动力电池，通常是将密封件套设在盖板的下侧并通过一焊接环夹持固定密封件，同时，极柱也通过该焊接环预固定，但由于焊接环并未将极柱完全固定，使得在后续注塑成型时，难以准确定位极柱的位置，并可能造成极柱移位进而导致密封件的密封性能降低。
发明内容
有鉴于此，本发明的目的在于提供一种动力电池的安全顶盖，以解决现有技术中极柱定位难以及密封性能不高的问题。
为达到上述目的，本发明提供一种动力电池的安全顶盖，包括盖板、形成于所述盖板上的第一极柱安装槽及第二极柱安装槽、置于所述第一极柱安装槽内的第一密封件及第一极柱、置于所述第二极柱安装槽内的第二密封件及第二极柱，以及绕所述第一极柱安装槽外缘一体成型于所述盖板上的第一极柱压环以及绕所述第二极柱安装槽外缘一体成型于所述盖板上的第二极柱压环；所述第一极柱压环及第二极柱压环均具有绕对应安装槽外缘一体成型于所述盖板上的环状本体、自所述环状本体上端向内延伸形成的压持部以及沿所述环状本体形成于所述压持部旁侧的第一避让部；所述第一极柱及第二极柱均包括柱形主体、形成于所述柱形主体外周对应于所述第一避让部位置处的定位凸部以及形成于所述柱形主体上对应于所述压持部位置处的第二避让部；当所述第一极柱及第二极柱分别置于所述第一极柱安装槽及第二极柱安装槽内后，所述定位凸部与所述压持部在水平投影面上至少部分重叠。
为解决上述技术问题，本申请还提供了一种动力电池的安全顶盖，包括盖板、形成于所述盖板上的第一极柱安装槽、置于所述第一极柱安装槽内的第一密封件及第一极柱，还包括 绕所述第一极柱安装槽外缘一体成型于所述盖板上的第一极柱压环；所述第一极柱压环具有绕第一极柱安装槽外缘一体成型于所述盖板上的环状本体、自所述环状本体上端向内延伸形成的压持部以及沿所述环状本体内周形成于所述压持部旁侧的第一避让部；所述第一极柱包括柱形主体、形成于所述柱形主体外周对应于所述第一避让部位置处的定位凸部以及形成于所述柱形主体上对应于所述压持部位置处的第二避让部；当所述第一极柱置于所述第一极柱安装槽内后，所述定位凸部与所述压持部在水平投影面上至少部分重叠。
为解决上述技术问题，本申请还提供了一种动力电池的安全顶盖，包括设有第一极柱安装槽的盖板、置于所述第一极柱安装槽内的第一密封件、第一极柱及隔离于所述第一极柱外周与所述安装槽内壁之间的第一绝缘件，所述第一极柱安装槽外缘一体向上延伸形成有第一极柱压环，所述第一极柱安装槽在水平方向延伸形成有位于所述第一极柱压环下方的绝缘环槽，所述第一极柱压环具有绕对应安装槽外缘一体成型于所述盖板上的环状本体、自所述环状本体上端向内延伸形成的压持部，所述第一密封件夹持于所述极柱下表面与所述绝缘环槽之间，所述第一绝缘件夹持于所述第一极柱压环内壁面与所述第一极柱外侧面之间，所述第一绝缘件向上延伸出外界并与所述第一极柱表面平齐。
本发明通过在盖板上一体成型具有压持部和第一避让部的极柱压环以及在第一极柱和第二极柱上设置与压持部和第一避让部配合的定位凸部和第二避让环槽，使得在装配极柱时，通过压持部与第二避让部、第一避让部与定位凸部的相互配合，能够对极柱进行预定位，以避免在注塑成型过程中因注塑材料的流动性导致极柱移位；同时，通过在安装槽内设置第一凸环和压装环槽，通过极柱主体与第一凸环和压装环槽的配合，可以将密封件压持在安装槽内，无需额外设置密封件的固定结构，简化动力电池的结构，提升了动力电池的可靠性。另，盖板上的极柱压环采用一体成型的结构，能够减少激光焊接工序，避免焊接工艺时的偏焊、焊缝凹陷或中断以及出现气孔等问题，以进一步提升动力电池的可靠性。
附图说明
图1为本发明一种动力电池的安全顶盖的结构示意图。
图2为图1的爆炸图。
图3为图1中第一极柱位置处的截面图。
图4为本发明的俯视图(无绝缘件)。
图5为图4中A-A的向视图。
图6为图5中B处的放大示意图。
图7为图2中第一密封件和第二密封件的结构示意图。
图8为图2中盖板的结构意图。
图9为图8中C处的放大结构图。
图10为图8的盖板的纵向截面图。
图11为图10中D处的放大结构图。
图12为图2中第一极柱和第二极柱的结构示意图。
图13为图2中第一绝缘件和第二绝缘件的结构示意图。
图14为图13的俯视图。
图15为图13中E-E的向视图。
图16为图13中F-F的向视图。
具体实施方式
下面通过具体实施方式进一步详细说明：
实施例
如图1～3所示，本实施例的一种动力电池的安全顶盖，包括盖板1、形成于所述盖板1上的第一极柱安装槽11a及第二极柱安装槽11b、置于所述第一极柱安装槽11a内的第一密封件3a及第一极柱2a、置于所述第二极柱安装槽11b内的第二密封件3b及第二极柱2b。所述第一极柱2a和第二极柱2b用于实现动力电池内电芯的正负极耳与外部电元件间的电连接；所述第一密封件3a压持于第一极柱安装槽11a与第一极柱2a的下表面之间，所述第二密封件3b压持于第二极柱安装槽11b与第二极柱2b的下表面之间，以实现动力电池顶盖的密封，避免动力电池内的电解液泄露。所述第一极柱2a及第二极柱2b分别通过第一绝缘件4a和第二绝缘件4b与所述盖板1绝缘隔离，所述第一绝缘件4a和第二绝缘件4b采用注塑工艺形成。所述盖板1下表面形成有与所述盖板1相适配的下绝缘件，所述下绝缘件下表面形成有与所述第一极柱2a电性连接的第一软连接件(图未示出)以及与所述第二极柱2b电性连接的第二软连接件(图未示出)，所述第一极柱2a及第二极柱2b的下表面分别通过第一软连接件及第二软连接件与电池的正负极耳电性连接，所述第一极柱2a及第二极柱2b的 上表面与外部电元件电性连接。
如图4～7所示，所述第一极柱安装槽11a及第二极柱安装槽11b均具有第一安装孔111、第一凸环112和压装环槽113，所述第一安装孔111垂直贯通所述盖板1，以用于与第一凸环112和压装环槽113配合安装第一密封件3a及第二密封件3b，并提供第一极柱2a和第二极柱2b与电芯的正负极耳电连接的通道。所述第一凸环112绕所述第一安装孔111周缘向上凸伸，用于对第一密封件3a和第二密封件3b的对应位置形成支撑并配合对应极柱对第一密封件3a和第二密封件3b进行压持；所述压装环槽113形成于所述第一凸环112的外周，用于容纳第一密封件3a和第二密封件3b的对应端。具体的，所述第一密封件3a及第二密封件3b均包括环形密封垫31以及形成于环形密封垫31内、外两侧的密封内圈32和密封外圈33，所述环形密封垫31的下表面支撑于第一凸环112的上表面，并经对应极柱压持于所述第一凸环112上，以实现动力电池的密封。所述密封内圈32自所述环形密封垫31的内周向下延伸形成，所述密封内圈32的外径与所述第一安装孔111的内径适配，且所述密封内圈32的内径与第一极柱2a和第二极柱2b对应端的直径适配，使得所述第一极柱2a和第二极柱2b分别安装于第一极柱安装槽11a和第二极柱安装槽11b内时，第一极柱2a和第二极柱2b的对应端套入所述密封内圈32并与第一凸环112的内壁配合挤压密封内圈32；所述密封外圈33自所述环形密封垫31外周向下延伸形成，所述密封外圈33的内径与所述压装环槽113的内径适配且所述密封外圈33的外径与所述压装环槽113的外径适配，使得所述密封外圈33的下端能压装于所述压装环槽113内，从而通过密封外圈33与压装环槽113的配合对第一密封件3a和第二密封件3b的安装进行定位，以便装配时快速安装所述第一密封件3a和第二密封件3b；同时，所述密封外圈33的高度大于所述压装环槽113的深度，以使得所述密封外圈33在压装于压装环槽113内时，能够在对应极柱的压持下与压装环槽113的槽底紧密贴合，以提高密封的可靠性。所述密封外圈33、密封内圈32及环形密封垫31围合形成一开口向下以与所述第一凸环112扣装的扣入槽34；装配时，将所述扣入槽34扣装于第一凸环112上，所述密封外圈33压装于所述压装环槽113内，所述密封内圈32嵌入所述第一安装孔111内，所述环形密封垫31压于所述第一凸环112上且上表面与对应极柱的下表面抵接，从而进一步提高密封的可靠性。
如图8～11所示，所述盖板1上绕第一极柱安装槽11a和第二极柱安装槽11b的外缘分 别一体成型有第一极柱压环12a和第二极柱压环12b，所述第一极柱2a与第一极柱压环12a配合将第一密封件3a压装于第一极柱安装槽11a与第一极柱2a之间，所述第二极柱2b可与第二极柱安装槽11b配合将第二密封件3b压装于第二极柱安装槽11b与第二极柱2b之间，用于实现动力电池的密封。在本实施例中，所述第一极柱压环12a和第二极柱压环12b优选采用铝、或钢合金材料的盖板1一体冲压成型，可减少激光焊接工艺步骤，且成型后的第一极柱压环12a和第二极柱压环12b与盖板1之间不存在焊缝，其可靠性更高。所述第一极柱压环12a和第二极柱压环12b均具有一环状本体121、压持部122和第一避让部123，所述环状本体121绕对应安装槽的外缘一体成型于所述盖板1上，且所述环状本体121向上凸出以形成一可容纳极柱的容置空间。所述压持部122自环状本体121的上端向内延伸形成，所述第一避让部123沿所述环状本体121形成于所述压持部122的旁侧，以在环状本体121上对应压持部122旁侧的位置处形成一缺口，使所述压持部122与第一避让部123能够与第一极柱2a及第二极柱2b的对应位置配合使第一极柱2a和第二极柱2b在顶盖装配时预定位于所述容置空间内，从而避免在注塑第一绝缘件4a和第二绝缘件4b时造成第一极柱2a和第二极柱2b移位。
在本实施例中，为提高所述第一极柱2a和第二极柱2b定位的可靠性，所述压持部122包括沿环状本体121的周向间隔分布于所述环状本体121上端的若干压持块122a，每一压持块122a均自所述环状本体121的上端向内延伸而形成，用于在第一极柱2a和第二极柱2b安装于对应的极柱安装槽内时，与第一极柱2a和第二极柱2b的对应位置配合以对第一极柱2a和第二极柱2b进行预定位，避免注塑绝缘件时，第一极柱2a和第二极柱2b移位甚至从对应的极柱安装槽内脱落。所述第一避让部123包括形成于每相邻两压持块122a之间的第一避让口123a，所述第一避让口123a的内径大于所述压持块122a的内径，以在装配时对第一极柱2a和第二极柱2b的对应位置进行避让，使所述第一极柱2a和第二极柱2b能够经由所述第一避让口123a装配于对应的极柱安装槽内。
如图12所示，所述第一极柱2a及第二极柱2b均包括柱形主体21、定位凸部22和第二避让部23，所述柱形主体21的直径小于所述压持块122a的内径，以使得第一极柱2a和第二极柱2b能够安装于极柱安装槽内。在本实施例中，所述第一极柱2a和第二极柱2b采用铝、铜或铜铝复合材料制成，以实现动力电池电芯与外部电元件间的导电。所述定位凸部22 形成于所述柱形主体21的外周上，并与所述第一避让部123位置处相对应，所述第二避让部23形成于所述柱形主体21的外周上，并与所述压持部122位置处相对应，使得第一极柱2a和第二极柱2b在装配时，所述第一避让部123可对所述定位凸部22进行避让，同时第二避让部23可对压持部122进行避让，进而将所述第一极柱2a及第二极柱2b分别安装于所述第一极柱安装槽11a及第二极柱安装槽11b内，而后将第一极柱2a和第二极柱2b转动一角度，使所述定位凸部22与所述压持部122在水平投影面上至少部分重叠，从而实现第一极柱2a和第二极柱2b的预定位。
所述定位凸部22包括形成于所述柱形主体21外周上的若干定位凸块22a，所述定位凸块22a与所述第一避让口123a的位置相对应，以使第一避让口123a对定位凸块22a进行避让；所述第二避让部23包括形成于所述柱形主体21外周上的若干第二避让口23a，所述第二避让口23a与所述压持块122a的位置相对应且位于每相邻两定位凸块22a之间，以使第二避让口23a对压持块122a进行避让，所述第一极柱2a和第二极柱2b装配完成后，所述定位凸块22a与压持块122a在水平投影面上至少部分重叠。具体的，每一定位凸块22a均自所述柱形主体21外周的对应位置向外延伸形成，所述定位凸块22a的直径小于第一避让口123a的内径且大于压持块122a的内径，同时，所述第二避让口23a的直径小于所述压持块122a的内径，以在第一极柱2a和第二极柱2b装配时，通过定位凸块22a与第一避让口123a、第二避让口23a与压持块122a的相互配合，能够装配于对应的极柱安装槽内，并于安装后通过定位凸块22a与压持块122a的配合对第一极柱2a和第二极柱2b进行预定位。在本实施例中，所述柱形主体21的外周面上向外凸出形成有一第二凸环24，所述定位凸块22a形成于所述第二凸环24的外周上且对应所述第一避让口123a的位置处，所述第二避让口23a形成于所述第二凸环24的外周上且对应于每相邻两定位凸块22a之间。
在本实施例中，所述柱形主体21还具有自柱形主体21的下表面向下延伸形成的下连接部25，所述下连接部25的直径与所述密封内圈32的内径相适配，使所述第一极柱2a和第二极柱2b分别安装于第一极柱安装槽11a和第二极柱安装槽11b内时，所述柱形主体21的下表面压持于所述环形密封垫31上，且所述下连接部25能够套入所述密封内圈32以穿越所述第一安装孔111与电池的正负极耳电芯连接，同时，所述下连接部25还与第一凸环112的内壁配合挤压密封内圈32，以提高密封的可靠性。此外，所述柱形主体21还具有自柱形 主体21的上表面向上凸伸形成的上连接部26，所述上连接部26的上表面裸露于第一绝缘件4a和第二绝缘件4b之外，以与外部电元件电性连接；在本实施例中，作为优选的，所述上连接部26的上表面高于所述第一绝缘件4a和第二绝缘件4b的上表面，以避免第一绝缘件4a和第二绝缘件4b在注塑成型过程中，覆盖所述上连接部26的上表面。
请返回参考图6，作为本实施例的一种优选方式，所述第一极柱安装槽11a及第二极柱安装槽11b还均具有一绝缘环槽114，所述绝缘环槽114形成于所述压装环槽113外，所述绝缘环槽114与对应的极柱和极柱压环合围形成一绝缘注塑空间6，以用于在所述绝缘注塑空间6内进行绝缘材料的注塑，进而实现盖板1与第一极柱2a和第二极柱2b间的电隔离。具体的，所述绝缘环槽114的槽底面高于所述压装环槽113的槽底面，确保密封外圈33能够压装于所述压装环槽113内的同时，环形密封垫31能够高于绝缘环槽114的槽底面，以在所述绝缘环槽114与对应极柱的外周面和对应极柱压环的内周面之间形成所述绝缘注塑空间6。
如图13～16所示，所述第一绝缘件4a及第二绝缘件4b均包括一体注塑形成于所述绝缘注塑空间6内的内绝缘包覆层41、形成于对应极柱压环上表面的上绝缘包覆层42以及形成于所述对应极柱压环外周面的外绝缘包覆层43。所述内绝缘包覆层41、上绝缘包覆层42和外绝缘包覆层43依次连接形成一开口向下的异形绝缘槽44，所述异形绝缘槽44的内壁(即内绝缘包覆层41的外周面、上绝缘包覆层42的下表面和外绝缘包覆层43的内周面)与第一极柱压环12a和第二极柱压环12b的内周面、上表面以及外周面仿形，以包覆所述第一极柱压环12a和第二极柱压环12b；所述第一绝缘件4a和第二绝缘件4b的内周面(即内绝缘包覆层41的内周面)与第一极柱2a和第二极柱2b的外周面和对应位置第一密封件3a和第二密封件3b的外周面仿形，以包裹所述第一极柱压环12a和第二极柱压环12b及填充绝缘注塑空间6，使第一极柱2a和第二极柱2b与对应的第一极柱压环12a和第二极柱压环12b电隔离。在本实施例中，所述第一绝缘件4a和第二绝缘件4b均采用绝缘耐腐蚀的高分子材料(如PP、PVC、PS、ABS、PC等)注塑形成，固化后形成所述第一绝缘件4a和第二绝缘件4b。
具体的，所述内绝缘包覆层41的内周面形成有与所述第二凸环24相适配的定位凹环，所述内绝缘包覆层41的内周面对应于所述定位凸块22a的位置处形成有相适配的定位凹槽 以及对应于所述第二避让口23a的位置处形成有向内凸伸的第一凸部41b；所述内绝缘包覆层41的外周面上对应于所述压持块122a下方的位置处形成有向外凸伸的第二凸部41c，所述压持块122a压持于所述第二凸部41c的上表面，所述上绝缘包覆层42上对应于所述第一避让口123a的位置处形成有向下嵌入所述第一避让口123a中并与所述内绝缘包覆层41连接的第三凸部42a。
请返回参考图2，所述下绝缘板5上对应于所述第一安装孔111的位置处形成有对应的第二安装孔51，所述第二安装孔51的尺寸与所述第一安装孔111适配，以使得极柱组件能够与动力电池内的电解液接触。为进一步增加本实施例的密封性能，在所述第二安装孔51的边缘处形成有一向上突起并延伸至第一安装孔111内的环形凸台52，所述环形凸台52的上表面与所述密封内圈32的下表面抵接，以进一步对密封件进行挤压，提升密封效果。所述第一极柱2a及第二极柱2b的下端向下依次穿越所述第一安装孔111及第二安装孔51以与电池极耳电性连接。
在本实施例中，所述下绝缘板5采用塑胶材料注塑成型，所述下绝缘板5的上表面形成有若干安装柱，所述盖板1的下表面对应所述安装柱的位置处形成有一一对应的安装槽，所述下绝缘板5通过安装柱与安装槽的配合利用超声压装工艺固定压装于所述盖板1的底部。当然，在其他的实施例中，所述下绝缘板5还可通过其他的方式固定于盖板1的底部，本实施例不做限制。所述下绝缘板5的下表面对应两端部的位置处还分别形成有一压块53，用于压持固定动力电池的电芯。在本实施例中，所述盖板1上还固置有一防爆机构7，用于动力电池在极端情况下其内部气压升高到一定值后，启动以将内部气体及时排出。具体的，所述防爆机构7包括一固置于所述盖板1上的防爆片71以及一固置于所述防爆片71底部的保护膜72，当动力电池内部的气压达到一定值后，电解液将依次冲破保护膜72和防爆片71，及时地将动力电池内部的气体和热量进行释放，避免爆炸。为方便安装所述防爆机构7，在盖板1上对应防爆机构7的位置处设有一上下贯穿所述盖板1的防爆孔13，所述防爆片71固定安装在防爆孔13内。
在本实施例中，所述盖板1上还形成有一上下贯穿所述盖板1的注液孔14，以用于在动力电池封装完成后，向动力电池的内部注入电解液。
本发明的动力电池的安全顶盖在进行装配时，首先，将一体成型的盖板1和注塑成型的 下绝缘板5压装固定，并将所述盖板1和下绝缘板5置于平面上；然后，将第一密封件3a和第二密封件3b分别置于第一极柱安装槽11a和第二极柱安装槽11b内，使密封外圈33压装于压装环槽113内，密封内圈32套于第一安装孔111的内侧壁上，进而使环形密封垫31的下表面支撑于第一凸环112的上表面；接着，将第一极柱2a和第二极柱2b分别置于对应侧的极柱安装槽上方，使所述定位凸块22a对应位于第一避让口123a的上方，所述第二避让口23a对应位于压持块122a的上方，并分别移动第一极柱2a和第二极柱2b至第一极柱安装槽11a和第二极柱安装槽11b内，使极柱主体的下连接部25对应套入密封内圈32，同时其下表面压持于环形密封垫31的上表面，再顺时针或逆时针将第一极柱2a和第二极柱2b转动一角度，使得定位凸块22a自第一避让口123a的下方逐渐移入压持块122a的下方，转动角度以极柱组件无法从对应的极柱安装槽内脱离为限，完成极柱组件的预定位；最后，将完成了第一极柱2a和第二极柱2b预定位的盖板1置于注塑装置中，向绝缘住宿空间以及极柱压环的上表面和外周面进行注塑，待注塑材料固化后形成第一绝缘件4a和第二绝缘件4b，完成本发明的装配，同时简化了结构和工艺，操作简单，具有较强的实用性。

Claims (20)

  1. 一种动力电池的安全顶盖，包括盖板、形成于所述盖板上的第一极柱安装槽及第二极柱安装槽、置于所述第一极柱安装槽内的第一密封件及第一极柱、置于所述第二极柱安装槽内的第二密封件及第二极柱，其特征在于：还包括绕所述第一极柱安装槽外缘一体成型于所述盖板上的第一极柱压环以及绕所述第二极柱安装槽外缘一体成型于所述盖板上的第二极柱压环；所述第一极柱压环及第二极柱压环均具有绕对应安装槽外缘一体成型于所述盖板上的环状本体、自所述环状本体上端向内延伸形成的压持部以及沿所述环状本体内周形成于所述压持部旁侧的第一避让部；所述第一极柱及第二极柱均包括柱形主体、形成于所述柱形主体外周对应于所述第一避让部位置处的定位凸部以及形成于所述柱形主体上对应于所述压持部位置处的第二避让部；当所述第一极柱及第二极柱分别置于所述第一极柱安装槽及第二极柱安装槽内后，所述定位凸部与所述压持部在水平投影面上至少部分重叠。
  2. 根据权利要求1所述的动力电池的安全顶盖，其特征在于：所述压持部包括沿所述环状本体的周向间隔分布于所述环状本体上端的若干压持块，每一压持块均自所述环状本体的上端向内延伸而形成，所述第一避让部包括形成于每相邻两压持块之间的第一避让口；所述定位凸部包括形成于所述柱形主体外周上对应于所述第一避让口位置处的定位凸块，所述第二避让部包括形成于所述柱形主体外周上对应于所述压持块位置处的第二避让口。
  3. 根据权利要求2所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱安装槽及第二极柱安装槽均具有垂直贯通所述盖板的第一安装孔、绕所述第一安装孔周缘向上凸伸的第一凸环以及形成于所述第一凸环外周的压装环槽，所述第一密封件及第二密封件均包括压持于所述第一凸环上的环形密封垫、自所述环形密封垫的内周向下延伸形成的密封内圈以及自所述环形密封垫外周向下延伸形成的密封外圈，所述密封外圈、密封内圈及环形密封垫围合形成一开口向下以与所述第一凸环扣装的扣入槽；当所述扣入槽扣装于所述第一凸环上时，所述密封外圈压装于所述压装环槽内，所述密封内圈嵌入所述第一安装孔内，所述环形密封垫压于所述第一凸环上且上表面与对应极柱的下表面抵接。
  4. 根据权利要求3所述的动力电池的安全顶盖，其特征在于：所述柱形主体的下表面向下延伸形成有直径与所述密封内圈的内径相适配的下连接部，当所述第一极柱及第二极柱分别置于所述第一极柱安装槽及第二极柱安装槽中时，所述柱形主体的下表面压持于所述环形密封垫上，所述下连接部套入所述密封内圈中以穿越所述第一安装孔与电池极耳电性连接。
  5. 根据权利要求3所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱安装槽及第二极柱安装槽还均具有形成于所述压装环槽外的绝缘环槽，所述绝缘环槽的槽底面高于所述压装环槽的槽底面；所述密封外圈的高度大于所述压装环槽的深度，当所述密封外圈扣装于所述压装环槽内时，所述环形密封垫高于所述绝缘环槽的槽底面；当所述第一极柱及第二极柱分别置于所述第一极柱安装槽及第二极柱安装槽中时，所述绝缘环槽、对应极柱的外周面以及对应极柱压环之间形成一绝缘注塑空间；
    所述动力电池的安全顶盖还包括使所述第一极柱与所述盖板绝缘隔离的第一绝缘件以及使所述第二极柱与所述盖板绝缘隔离的第二绝缘件，所述第一绝缘件及第二绝缘件均包括一体注塑形成于所述绝缘注塑空间内的内绝缘包覆层、形成于对应极柱压环上表面的上绝缘包覆层以及形成于所述对应极柱压环外周面的外绝缘包覆层。
  6. 根据权利要求5所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱及第二极柱还均包括形成于所述柱形主体外周的第二凸环，所述定位凸块形成于所述第二凸环外周上对应于所述第一避让口的位置处，所述第二避让口形成于所述第二凸环外周上且位于每相邻两定位凸块之间；所述内绝缘包覆层的内周面形成有与所述第二凸环相适配的定位凹环，所述内绝缘包覆层的内周面对应于所述定位凸块的位置处形成有相适配的定位凹槽以及对应于所述第二避让口的位置处形成有向内凸伸的第一凸部；所述内绝缘包覆层的外周面上对应于所述压持块下方的位置处形成有向外凸伸的第二凸部，所述压持块压持于所述第二凸部的上表面，所述上绝缘包覆层上对应于所述第一避让口的位置处形成有向下嵌入所述第一避让口中并与所述内绝缘包覆层连接的第三凸部。
  7. 根据权利要求6所述的一种动力电池的安全顶盖，其特征在于：所述柱形主体上表面向上凸伸形成有与外部电元件电性连接的上连接部；所述上绝缘包覆层的上表面低于所述上连接部的上表面。
  8. 根据权利要求5所述的一种动力电池的安全顶盖，其特征在于：还包括一压装于所述盖板底部的下绝缘板，所述下绝缘板上对应于所述第一安装孔的位置处形成有一与所述第一安装孔适配的第二安装孔，所述第二安装孔的边缘形成有一向上凸起的环形凸台，所述环形凸台的上表面与密封内圈的下表面抵接；所述第一极柱及第二极柱的下端向下依次穿越所述第一安装孔及第二安装孔以与电池极耳电性连接。
  9. 根据权利要求1所述的一种动力电池的安全顶盖，其特征在于：还包括一固置于所述盖板上的防爆机构，所述盖板上对应于所述防爆机构的位置处形成有一防爆孔，所述防爆机构包括一固置于所述防爆孔内的防爆片以及一固置于所述防爆片底部的保护膜。
  10. 根据权利要求1所述的一种动力电池的安全顶盖，其特征在于：还包括一形成于所述盖板上的注液孔。
  11. 一种动力电池的安全顶盖，包括盖板、形成于所述盖板上的第一极柱安装槽、置于所述第一极柱安装槽内的第一密封件及第一极柱，其特征在于：还包括绕所述第一极柱安装槽外缘一体成型于所述盖板上的第一极柱压环；所述第一极柱压环具有绕第一极柱安装槽外缘一体成型于所述盖板上的环状本体、自所述环状本体上端向内延伸形成的压持部以及沿所述环状本体内周形成于所述压持部旁侧的第一避让部；所述第一极柱包括柱形主体、形成于所述柱形主体外周对应于所述第一避让部位置处的定位凸部以及形成于所述柱形主体上对应于所述压持部位置处的第二避让部；当所述第一极柱置于所述第一极柱安装槽内后，所述定位凸部与所述压持部在水平投影面上至少部分重叠。
  12. 根据权利要求11所述的动力电池的安全顶盖，其特征在于：所述压持部包括沿所述环状本体的周向间隔分布于所述环状本体上端的若干压持块，每一压持块均自所述环状本体的上端向内延伸而形成，所述第一避让部包括形成于每相邻两压持块之间的第一避让口；所述定位凸部包括形成于所述柱形主体外周上对应于所述第一避让口位置处的定位凸块，所述第二避让部包括形成于所述柱形主体外周上对应于所述压持块位置处的第二避让口。
  13. 根据权利要求12所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱安装槽具有垂直贯通所述盖板的第一安装孔、绕所述第一安装孔周缘向上凸伸的第一凸环以及形成于所述第一凸环外周的压装环槽，所述第一密封件包括压持于所述第一凸环上的环形密封垫、自所述环形密封垫的内周向下延伸形成的密封内圈以及自所述环形密封垫外周向下延伸形成的密封外圈，所述密封外圈、密封内圈及环形密封垫围合形成一开口向下以与所述第一凸环扣装的扣入槽；当所述扣入槽扣装于所述第一凸环上时，所述密封外圈压装于所述压装环槽内，所述密封内圈嵌入所述第一安装孔内，所述环形密封垫压于所述第一凸环上且上表面与对应极柱的下表面抵接。
  14. 根据权利要求13所述的动力电池的安全顶盖，其特征在于：所述柱形主体的下表面 向下延伸形成有直径与所述密封内圈的内径相适配的下连接部，当所述第一极柱置于所述第一极柱安装槽中时，所述柱形主体的下表面压持于所述环形密封垫上，所述下连接部套入所述密封内圈中以穿越所述第一安装孔与电池极耳电性连接。
  15. 根据权利要求13所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱安装槽具有形成于所述压装环槽外的绝缘环槽，所述绝缘环槽的槽底面高于所述压装环槽的槽底面；所述密封外圈的高度大于所述压装环槽的深度，当所述密封外圈扣装于所述压装环槽内时，所述环形密封垫高于所述绝缘环槽的槽底面；当所述第一极柱置于所述第一极柱安装槽中时，所述绝缘环槽、对应极柱的外周面以及对应极柱压环之间形成一绝缘注塑空间；
    所述动力电池的安全顶盖还包括使所述第一极柱与所述盖板绝缘隔离的第一绝缘件，所述第一绝缘件包括一体注塑形成于所述绝缘注塑空间内的内绝缘包覆层、形成于对应极柱压环上表面的上绝缘包覆层以及形成于所述对应极柱压环外周面的外绝缘包覆层。
  16. 根据权利要求15所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱包括形成于所述柱形主体外周的第二凸环，所述定位凸块形成于所述第二凸环外周上对应于所述第一避让口的位置处，所述第二避让口形成于所述第二凸环外周上且位于每相邻两定位凸块之间；所述内绝缘包覆层的内周面形成有与所述第二凸环相适配的定位凹环，所述内绝缘包覆层的内周面对应于所述定位凸块的位置处形成有相适配的定位凹槽以及对应于所述第二避让口的位置处形成有向内凸伸的第一凸部；所述内绝缘包覆层的外周面上对应于所述压持块下方的位置处形成有向外凸伸的第二凸部，所述压持块压持于所述第二凸部的上表面，所述上绝缘包覆层上对应于所述第一避让口的位置处形成有向下嵌入所述第一避让口中并与所述内绝缘包覆层连接的第三凸部。
  17. 根据权利要求16所述的一种动力电池的安全顶盖，其特征在于：所述柱形主体上表面向上凸伸形成有与外部电元件电性连接的上连接部；所述上绝缘包覆层的上表面低于所述上连接部的上表面。
  18. 根据权利要求15所述的一种动力电池的安全顶盖，其特征在于：还包括一压装于所述盖板底部的下绝缘板，所述下绝缘板上对应于所述第一安装孔的位置处形成有一与所述第一安装孔适配的第二安装孔，所述第二安装孔的边缘形成有一向上凸起的环形凸台，所述环形凸台的上表面与密封内圈的下表面抵接；所述第一极柱的下端向下依次穿越所述第一安装 孔及第二安装孔以与电池极耳电性连接。
  19. 一种动力电池的安全顶盖，包括设有第一极柱安装槽的盖板、置于所述第一极柱安装槽内的第一密封件、第一极柱及隔离于所述第一极柱外周与所述安装槽内壁之间的第一绝缘件，其特征在于：所述第一极柱安装槽外缘一体向上延伸形成有第一极柱压环，所述第一极柱安装槽在水平方向延伸形成有位于所述第一极柱压环下方的绝缘环槽，所述第一极柱压环具有绕对应安装槽外缘一体成型于所述盖板上的环状本体、自所述环状本体上端向内延伸形成的压持部，所述第一密封件夹持于所述极柱下表面与所述绝缘环槽之间，所述第一绝缘件夹持于所述第一极柱压环内壁面与所述第一极柱外侧面之间，所述第一绝缘件向上延伸出外界并与所述第一极柱表面平齐。
  20. 根据权利要求19所述的一种动力电池的安全顶盖，其特征在于：所述第一极柱压环的环状本体与压持部初始状态为竖直状态，在将所述第一密封件、第一极柱与第一绝缘件装入所述第一极柱安装槽内后，将竖直状态的环状本体顶端沿径向铆压形成压持于所述第一绝缘件上表面的所述压持部。
PCT/CN2023/100085 2022-06-16 2023-06-14 一种动力电池的安全顶盖 WO2023241603A1 (zh)

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