WO2022262403A1 - 动力电池顶盖及其制造方法 - Google Patents
动力电池顶盖及其制造方法 Download PDFInfo
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- WO2022262403A1 WO2022262403A1 PCT/CN2022/087542 CN2022087542W WO2022262403A1 WO 2022262403 A1 WO2022262403 A1 WO 2022262403A1 CN 2022087542 W CN2022087542 W CN 2022087542W WO 2022262403 A1 WO2022262403 A1 WO 2022262403A1
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- WIPO (PCT)
- Prior art keywords
- pole
- wall
- pressing
- welding
- ring
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 74
- 238000003825 pressing Methods 0.000 claims abstract description 61
- 238000005452 bending Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims description 111
- 238000002788 crimping Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 10
- 238000001746 injection moulding Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
-
- 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
Definitions
- the present application relates to the field of power batteries, in particular to a power battery top cover and a manufacturing method thereof.
- the power battery includes several battery cells, a bus assembly connecting the battery cells in parallel, and a pair of poles electrically connecting the bus assembly and transmitting electric energy.
- the power battery also includes a casing and a top cover that closes the casing. on the above-mentioned top cover and require the cover plate of the top cover to be electrically isolated.
- Patent application No. 201921132385.1 of the People's Republic of China discloses a power battery top cover, which includes a cover plate with a pole hole, a pole, and the pole is integrally formed in the pole hole for insulation Body, sealing ring and welding ring.
- the periphery of the pole hole protrudes upwards to form a protruding ring part
- the pole is fixed on the lower side of the protruding ring part by the insulating body
- the sealing ring is sleeved under the cover plate
- the The welding ring is inserted into the outer side of the lower side of the pole and welded to the welding ring on the lower side of the cover plate after clamping the sealing ring, and the pole is fixed inside by the welding ring.
- there are certain defects in the design of the sealing ring and the nodular sealing performance of the insulating body needs to be tested.
- the application provides a power battery top cover, including a cover plate with a pole hole, a welding ring welded to the outer periphery of the pole hole, a sealing ring, a pole and the pole
- the insulating body is integrally molded and fixed in the pole hole and the welding ring
- the pole hole includes a perforation and a flange protruding upward from the edge of the perforation
- the sealing ring is sleeved on the flange
- the pole includes a cylinder, a contact part formed on the upper part of the cylinder, a connecting part formed on the lower part of the cylinder, and a support formed by extending from the cylinder radially outward and abutting against the sealing ring
- the welding ring includes a welding bottom surface welded and fixed on the cover plate on the outer periphery of the perforation, an extension wall formed by extending from the inner side of the welding bottom surface obliquely inwardly and upwardly, and an extension wall
- the application also provides a power battery top cover, including a cover plate with a pole hole, a welding ring welded to the outer periphery of the pole hole, a sealing ring, a pole and the pole
- the pole is integrally formed and fixed in the pole hole and the insulating body in the welding ring.
- the pole hole includes a perforation, a depression formed on the outer periphery of the perforation from the surface of the cover plate, and a depression upward from the edge of the depression.
- the pole includes a cylinder, a contact part formed on the upper part of the cylinder, formed on the lower part of the cylinder and inserted into the The connecting part in the sealing ring and the protruding part extending from the center of the cylinder radially outwardly against the sealing ring
- the welding ring includes a welding bottom surface welded and fixed in the concave part
- the extension wall formed by extending obliquely inwardly and upwardly from the inner side of the welding bottom surface and the pressing part formed by bending inward from the top of the extension wall
- the insulating body includes a top wall connected to the top wall and solidified on the pole The clamping portion between the column and the welding ring and the covering outer wall connecting the top wall and covering the outer side of the welding ring.
- the present application also provides a method for manufacturing a power battery top cover, including the following steps:
- the welding ring includes a welding bottom surface, an extension wall formed by extending obliquely upward from the inner side of the welding bottom surface, and a pressing formed by bending inward from the top of the extension wall part, the cover plate is provided with a pole hole, the cover plate is located on the outer periphery of the pole hole and is recessed downward to form a depression, the welding bottom surface is welded on the depression, and the depression is located on the The periphery of the pole hole protrudes upwards to form a convex edge;
- the power battery top cover and its manufacturing method of the present application provide an upwardly protruding convex edge and a concave portion whose surface is lower than the convex edge on the outer periphery of the pole hole, and weld and fix the welding ring in the concave portion , set a sealing ring on the flange, put the pole down into the welding ring and press the sealing ring to achieve waterproofing, and then fix the pole to the welding ring by injection molding the insulating body
- the structure has good sealing performance, and the structure is stable and firm.
- Figure 1 is a three-dimensional assembly diagram of the power battery top cover of the present application.
- Fig. 2 is a three-dimensional exploded view of the top cover of the power battery of the present application
- Fig. 3 is a partially enlarged view of the dotted circle shown in Fig. 2 of the top cover of the power battery of the present application;
- Fig. 4 is a three-dimensional exploded view of the pole, the insulating body, the welding ring and the sealing ring of the top cover of the power battery of the present application;
- Fig. 5 is a three-dimensional exploded view of another angle of the pole, the insulating body, the welding ring and the sealing ring of the top cover of the power battery of the present application;
- Fig. 6 is a sectional view along A-A dotted line shown in Fig. 4;
- Fig. 7 is a sectional view along the dotted line B-B shown in Fig. 1 and a partially enlarged view thereof.
- the X direction shown in FIG. 1 is taken as the horizontal direction
- the Y direction is taken as the longitudinal direction
- the Z direction is taken as the upper direction of the vertical direction.
- the top cover of the power battery of this application includes a cover plate 20 with a pole hole 22, a welding ring 50 welded to the periphery of the pole hole 22, and a sleeve set on the pole.
- the sealing ring 40 on the upper peripheral edge of the hole 22, the pole 30, the insulating body 60 that integrally molds the pole 30 into the pole hole 22 and the welding ring 50 and fixes it to the cover plate by hot melting The inner shell 10 of the bottom surface of 20.
- the cover plate 20 includes a plate body 21 , the pole hole 22 formed through the plate body 21 , an explosion-proof opening 23 and a liquid injection hole 24 .
- the pole hole 22 includes a through hole 221 , a recessed portion 222 located on the outer periphery of the through hole 221 formed downwardly from the plate body 21 , a convex edge 224 formed upwardly from the periphery of the through hole 221 , and formed from the
- the recessed part 222 surrounds the protruding edge 224 to form a recessed inner ring 223 further recessed downward, and an inner recessed ring 226 formed by recessing upwards from the bottom surface of the board 21 around the edge of the through hole 221 .
- the outer periphery of the recessed portion 222 is further provided with a recessed edge 225 recessed from the surface of the plate body 21 .
- the surface of the concave inner ring 223 is lower than the top surface of the convex edge 222 , and preferably, the surface of the concave inner ring 223 is lower than the surface of the concave portion 222 .
- the surface of the concave edge 225 is higher than the surface of the concave portion 222 .
- the top surface of the protruding edge 222 is not lower than the surface of the concave portion 222 .
- the inner shell 10 includes an inner shell 11 covering the bottom surface of the plate body 21, a through hole 13 formed through the inner shell 11 corresponding to the through hole 221, and a through hole 13 formed corresponding to the liquid injection hole 24 through the inner shell.
- the inner casing 11 extends upwards to form a number of heat-melt columns 12, and the bottom surface of the plate body 21 is provided with a number of heat-melt holes (not shown) corresponding to the positions of the heat-melt columns 12.
- the heat-melt columns 12 extend After entering the hot-melt hole, it is hot-melted and fixed.
- the middle position of the fence 14 is recessed downward and does not directly contact the bottom side of the explosion-proof opening 23 .
- An explosion-proof plate 72 is welded on the bottom side of the explosion-proof opening 23 , and a protective film 71 is fixed on the top of the explosion-proof opening 23 .
- the poles 30 include a positive pole and a negative pole, each pole 30 includes a cylinder 31, and a contact portion 32 formed on the upper side of the cylinder 31 , the convex portion 33 extending radially outward from the middle portion of the cylinder 31 and the connecting portion 34 formed on the lower side of the cylinder 31 .
- the outer convex portion 33 is located between the contact portion 32 and the connecting portion 34, the outer diameter of the contact portion 32 is smaller than the outer diameter of the outer convex portion 33, and the outer diameter of the connecting portion 34 is smaller than the outer diameter of the connecting portion 34.
- the outer diameter of the convex portion 33 preferably the outer diameter of the connecting portion 34 is smaller than the outer diameter of the contact portion 32 .
- the outer periphery of the top surface of the contact portion 32 is recessed to form a concave edge 321
- the outer periphery of the outer convex portion 33 is formed with a plurality of protrusions 331
- a plurality of notches 332 are formed between adjacent protrusions 331 .
- the number of the protruding pieces 331 is not less than three, and the number of the protruding pieces 331 of the positive pole and the negative pole is inconsistent so as to distinguish the positive pole and the negative pole.
- the positive pole is made of one material, aluminum alloy.
- the negative pole is combined with two materials, that is, the contact part 32 and part of the convex part 33 are made of aluminum alloy, and part of the convex part 33 and the connecting part 34 are made of copper alloy.
- the two can be welded by friction welding way combined.
- the reason why the two materials are selected to be combined at the position of the convex portion 33 is that the cross-sectional area of the convex portion 33 is the largest, and combining at the convex portion 33 can effectively increase the bonding area of the two materials, Increase binding force. In other embodiments, other binding positions of the two materials can also be chosen.
- the outer periphery of the convex portion 33 is an inclined surface structure.
- the welding ring 50 includes a welding bottom surface 51 attached to the surface of the recessed part 222, an extension wall 52 extending obliquely from the inner side of the welding bottom surface 51 to the inner upper side, and bending inward from the top of the extension wall 52. Formed pressing portion 53 .
- the outer diameter of the welding bottom surface 51 is not greater than the inner diameter of the concave portion 222 and the outer circumference of the welding bottom surface 51 is fitted to the outside of the concave portion 222 for precise positioning.
- the welding bottom surface 51 and the concave portion 222 The surfaces are welded together.
- the extension wall 52 extends obliquely inwardly and upwardly to form an inclined wall surface, that is, the inner diameter of the bottom is larger than the inner diameter of the top.
- a plurality of flow holes 521 are formed through the extension wall 52 .
- the pressing part 53 is further formed with a plurality of pressing protrusions 531 protruding inwardly, and a plurality of escape grooves 532 are formed between adjacent pressing protrusions 531 .
- the inner diameter of the pressing protrusion 531 is smaller than the outer diameter of the protrusion 331 of the outer protrusion 33 of the pole 30 and greater than the outer diameter of the notch 332 .
- the inner diameter of the escape groove 532 is larger than the outer diameter of the protruding piece 331 .
- the pole 30 In order to facilitate the protruding piece 331 of the pole 30 to make the pole 30 enter into the welding ring 50 downward when corresponding to the avoidance groove 532, the pole 30 is rotated at a certain angle so that the protruding piece 331 is located below the pressing protrusion 531 . And projected in the vertical direction, the protruding piece 331 at least partially overlaps with the pressing protrusion 531 .
- the sealing ring 40 includes a crimping surface 41, a sleeve hole 42 formed through the crimping surface 41, an inner side wall 43 and an outer side wall 44 respectively extending downward from the radial sides of the crimping surface 41 and forming
- the snap-in groove 45 is formed between the inner wall 43 and the outer wall 44 .
- the vertical length of the inner side wall 43 is greater than the vertical length of the outer side wall 44 .
- the sealing ring 40 is pressed into the convex edge 224 on the periphery of the perforation 221, that is, the convex edge 224 snaps into the groove 45, the outer side wall 44 extends into the concave inner ring 223, and the inner side wall
- the wall 43 is attached to the inner wall surface of the through hole 221 .
- the concave inner ring 223 can be omitted, and the outer wall 44 is directly attached to the surface of the concave portion 222 .
- the pole 30 is pressed downwards on the crimping surface 41 of the sealing ring 40 , specifically, the connecting portion 34 is pressed into the through hole 221 and connected to the through hole 221 or the flange 224
- the inner wall surface clamps the inner wall 43 of the sealing ring 40 .
- the bottom surface of the protruding portion 33 is crimped on the crimping surface 41 of the sealing ring 40 .
- the pole 30 can be pre-positioned through the perforation 221 and the sealing ring 40 thereon, the contact portion 32 of the pole 30 is exposed outside the top of the welding ring 50 , and the convex portion 33 of the pole 30 There is a gap and no contact with the pressing protrusion 531 of the welding ring 50 .
- the insulating body 60 includes a top wall 61 covering the upper side of the welding ring 50 , a clamping portion 62 filling downward from the inner side of the top wall 61 to between the welding ring 50 and the pole 30 , The outer side of the top wall 61 is filled downwardly with the covering outer wall 63 covering the outer side of the welding ring 50 and the accommodating gap 64 formed between the clamping portion 62 and the covering outer wall 63 .
- the top wall 61 covers the upper surface of the protruding portion 33 of the pole 30 and the surface of the holding portion 53 of the welding ring 50.
- the molten plastic flows downward from the avoidance groove 532 of the holding portion 53, and at the same time fills the Pressing the space between the protruding part 531 and the protruding piece 331, while continuing to flow downward along the notch 332, and the flow hole 521 on the extension wall 52 facilitates the plastic flow to pass through the clamping part 62 and the clamping part 62.
- the covering outer wall 63 is partly connected as a whole.
- the clamping portion 62 includes a first clamping portion 621 located on the upper portion and pressing on the upper surface of the convex portion 33 of the pole 30 and penetrating into the surface of the concave portion 222 and clamped between the extension wall 52 and the The second clamping portion 622 on the outer periphery of the pole 30 .
- the covering outer wall 63 includes a first covering outer wall 631 covering the outer surface of the extension wall 52 and a second covering outer wall 632 covering the upper side of the welding ground 51 and the concave edge 225 .
- the shape of the accommodating slot 64 fits the shape of the extension wall 52 and has an inclined structure.
- the clamping portion 62 is at least vertically supported by the convex portion 33 and the The clamping force of the clamping portion 53 enables the pole 30 to be fixed and limited.
- the pressing protrusion 531 of the welding ring 50 and the protruding piece 331 of the outer protrusion 33 of the pole 30 are directly clamped by force in the vertical direction, stably holding the pole 30 on the welding ring. 50 and the convex edge 224 or the concave portion 222 .
- the manufacturing method of the power battery top cover of the present application comprises the following steps:
- the welding bottom surface 51 of the welding ring 50 is attached to the surface of the concave part 222, and the welding ring 50 is welded and fixed on the surface of the concave part 222 by spot welding or other methods from the upper side of the welding bottom surface 51. pole hole 22.
- the first assembly method is to separately assemble the sealing ring 40 onto the flange 224 on the outer periphery of the pole hole 22, and press the sealing ring 40; Press it in, and make the connection part 34 of the pole 30 press into the sleeve hole 42 of the sealing ring 40 for pre-positioning.
- the convex part 33 of the pole 30 corresponds to the avoidance groove 532 of the pressing part 53 so that the protruding piece 331 of the pole 30 avoids the pressing convex part 531 of the pressing part 53 and enters the welding ring 50, and then the The pole 30 is rotated at a certain angle to move the protruding piece 331 below the pressing protrusion 531 , and finally, the connecting portion 34 of the pole 30 is pre-fixed into the sleeve hole 42 of the sealing ring 40 .
- the second assembly method is: first insert the sealing ring 40 into the outer periphery of the connecting portion 34 of the pole 30; then press the combination of the pole 30 and the sealing ring 40 into the welding ring 50
- the snap-in groove 45 of the sealing ring 40 wraps around the flange 224 on the outer periphery of the through hole 221 .
- This assembly method is the same as above, first make the protruding piece 331 of the outer convex part 33 correspond to the escape groove 532 of the holding part 53 so that the pole 30 can enter the welding ring 50 smoothly, and then put the pole 30 and the sealing ring 40 are rotated at a certain angle, so that the tab 331 is located below the pressing convex portion 531; finally, the combination of the pole 30 and the sealing ring 40 is pressed down, so that the The fastening groove 45 of the sealing ring 40 wraps on the flange 224 on the outer periphery of the through hole 221 .
- the molten plastic penetrates into the outer side of the pole 30 and is solidified inside and outside the welding ring 50.
- the outer periphery of the pole hole 22 only retains the upward convex edge 224, and the concave part 222 is eliminated, and the upper surface of the plate body 21 is directly used as the plastic bonding surface, and the convex edge 224
- the top is higher than the upper surface of the plate body 21, this embodiment is not the optimal solution, it will cause difficulty in positioning when welding the welding ring 50, and the height of the pole 30 protruding from the plate body 21 will be increased. Large, affecting the appearance, but if the manufacturing process is accurate enough, this embodiment is still one of the options.
- the power battery top cover and its manufacturing method of the present application set an upwardly protruding flange 224 on the outer periphery of the pole hole 22, weld and fix the welding ring 50 on the outer periphery of the flange 224, and cover the flange 224.
- Set the sealing ring 40 put the pole 30 into the welding ring 50 downwards and press the sealing ring 40 to realize waterproofing, and then fix the pole 30 on the protrusion by injection molding the insulating body 60
- the structure has good sealing performance between the edge 224 and the welding ring 50, and the structure is stable and firm.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
一种动力电池顶盖，包括设有极柱孔的盖板、焊接于所述极柱孔外周的焊接环、密封圈、极柱及将所述极柱一体成型固定于所述极柱孔与焊接环内的绝缘本体，所述极柱孔包括穿孔、自所述盖板表面凹陷形成于所述穿孔外周的凹陷部及自所述凹陷部边缘向上凸出形成的凸边，所述密封圈套设于所述凸边上，所述极柱包括柱体、形成于所述柱体上部的接触部、形成于所述柱体下部且套入所述密封圈内的连接部及自所述柱体中间沿径向外侧延伸形成的抵持于所述密封圈上的外凸部，所述焊接环包括焊接固定于所述凹陷部内的焊接底面、自所述焊接底面内侧斜向内上方延伸形成的延伸壁及自所述延伸壁顶部向内折弯形成的压持部。本申请还包括一种动力电池顶盖制造方法。
Description
本申请涉及动力电池领域，尤指一种动力电池顶盖及其制造方法。
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，所述动力电池还包括有外壳、封闭所述外壳的顶盖，所述极柱固定于所述顶盖上并需要顶盖的盖板保持电隔离。中华人民共和国第201921132385.1号专利申请揭示了一种动力电池顶盖，该动力电池顶盖包括设有极柱孔的盖板、极柱、将所述极柱一体成型于所述极柱孔内绝缘本体、密封圈及焊接环。所述极柱孔周缘向上凸出形成凸出环部，所述极柱被所述绝缘本体固定于所述凸出环部下侧，所述密封圈套设于所述盖板下，再将所述焊接环套入所述极柱下方外侧并夹持所述密封圈后焊接于所述盖板下侧的焊接环，所述极柱通过所述焊接环固定在内。该技术方案在注塑成型时比较难定位所述所述极柱，同时密封圈的设计存在一定缺陷，还需要考验绝缘本体结核性的密封性能。
发明内容
鉴于此，有必要提供一种密封性好，且容易制造的动力电池顶盖及其制造方法。
为解决上述技术问题，本申请提供了一种动力电池顶盖，包括设有极柱孔的盖板、焊接于所述极柱孔外周的焊接环、密封圈、极柱及将所述极柱一体成型固定于所述极柱孔与焊接环内的绝缘本体，所述极柱孔包括穿孔及自所述穿孔边缘向上凸出形成的凸边，所述密封圈套设于所述凸边上，所述极柱包括柱体、形成于所述柱体上部的接触部、形成于所述柱体下部的连接部及自所述柱体沿径向外侧延伸形成的抵持于所述密封圈上的外凸部，所述焊接环包括焊接 固定于所述穿孔外周的盖板上的焊接底面、自所述焊接底面内侧斜向内上方延伸形成的延伸壁及自所述延伸壁顶部向内折弯形成的压持部，所压持部至少部分在垂直投影方向上与所述外凸部重合，所述绝缘本体填充所述极柱与所述焊接环之间的空间。
为解决上述技术问题，本申请还提供了一种动力电池顶盖，包括设有极柱孔的盖板、焊接于所述极柱孔外周的焊接环、密封圈、极柱及将所述极柱一体成型固定于所述极柱孔与焊接环内的绝缘本体，所述极柱孔包括穿孔、自所述盖板表面凹陷形成于所述穿孔外周的凹陷部及自所述凹陷部边缘向上凸出形成的凸边，所述密封圈套设于所述凸边上，所述极柱包括柱体、形成于所述柱体上部的接触部、形成于所述柱体下部且套入所述密封圈内的连接部及自所述柱体中间沿径向外侧延伸形成的抵持于所述密封圈上的外凸部，所述焊接环包括焊接固定于所述凹陷部内的焊接底面、自所述焊接底面内侧斜向内上方延伸形成的延伸壁及自所述延伸壁顶部向内折弯形成的压持部，所述绝缘本体包括顶壁、连接所述顶壁并固化于所述极柱与所述焊接环之间的夹持部及连接所述顶壁并覆盖所述焊接环外侧的覆盖外壁。
为解决上述技术问题，本申请还提供了一种动力电池顶盖的制造方法，包括如下步骤：
S10、将一焊接环固定至一盖板上；所述焊接环包括焊接底面、自所述焊接底面内侧斜向上延伸形成的的延伸壁及自所述延伸壁顶部向内折弯形成的压持部，所述盖板设有极柱孔，所述盖板位于所述极柱孔外周向下凹陷形成有凹陷部，所述焊接底面焊接于所述凹陷部上，所述凹陷部位于所述极柱孔周缘向上凸出形成有凸边；
S20、将一密封圈与一极柱向下组装至所述极柱孔与所述焊接环内，所述密封圈被夹持于所述极柱的下表面与所述极柱孔外周的凸边之间；
S30、将焊接有焊接环的盖板、极柱与密封圈的组合体进行模内注塑成型形成一绝缘本体；所述绝缘本体将所述极柱固定于所述极柱孔的凸边与所述焊 接环的压持部之间。
本申请动力电池顶盖及其制造方法通过在所述极柱孔的外周设置向上凸出的凸边及表面低于所述凸边的凹陷部，将所述焊接环焊接固定在所述凹陷部内，在所述凸边上套设密封圈，将极柱向下装入所述焊接环内并压紧所述密封圈实现防水，而后通过注塑成型所述绝缘本体将所述极柱固定于所述凸边与所述焊接环内，该结构密封性能好，且结构稳定牢固。
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1为本申请动力电池顶盖的立体组合图；
图2为本申请动力电池顶盖的立体分解图；
图3为本申请动力电池顶盖图2所示虚线圈的局部放大图；
图4为本申请动力电池顶盖的极柱、绝缘本体、焊接环及密封圈的立体分解图；
图5为本申请动力电池顶盖的极柱、绝缘本体、焊接环及密封圈另一角度的立体分解图；
图6为沿图4所示A-A虚线的剖视图；
图7为沿图1所示B-B虚线的剖视图及其局部放大图。
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请具体实施例及相应的附图对本申请技术方案进行清楚、完整地描述。显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
本申请以图1所示X方向为横向方向，以Y方向为纵向方向，以Z方向为垂直方向的上方。
请继续参阅图1至图3所示，本申请动力电池顶盖包括设有极柱孔22的 盖板20、焊接于所述极柱孔22周缘的焊接环50、套设于所述极柱孔22上侧周缘的密封圈40、极柱30、将所述极柱30一体成型固定于所述极柱孔22与所述焊接环50内的绝缘本体60及热熔固定于所述盖板20底面的内壳10。
所述盖板20包括板体21、贯穿所述板体21形成的所述极柱孔22、防爆口23及注液孔24。所述极柱孔22包括穿孔221、自所述板体21向下凹陷形成的位于所述穿孔221外周的凹陷部222、自所述穿孔221周缘向上凸出形成的凸边224、自所述凹陷部222环绕所述凸边224向下进一步凹陷形成的凹陷内环223及自所述板体21底面环绕所述穿孔221边缘向上凹陷形成的内侧凹环226。所述凹陷部222外周还设有自所述板体21表面凹陷形成的凹陷边缘225。
所述凹陷内环223的表面低于所述凸边222的顶面，且优选所述凹陷内环223的表面低于所述凹陷部222的表面。所述凹陷边缘225的表面高于所述凹陷部222的表面。所述凸边222的顶面不低于所述凹陷部222的表面。
所述内壳10包括覆盖所述板体21底面的内壳体11、贯穿所述内壳体11且对应所述穿孔221形成的通孔13、对应所述注液孔24贯穿所述内壳体11的注液通孔15、形成于所述防爆口23下方的栅栏14及覆盖所述板体21横向两侧的端部16。所述内壳体11向上延伸形成有若干热熔柱12，所述板体21底面对应所述热熔柱12位置处开设有若干热熔孔(未图示)，所述热熔柱12伸入所述热熔孔内后热熔固定。所述栅栏14中间位置处向下凹陷不与所述防爆口23底侧直接接触。所述防爆口23的底侧焊接有防爆片72，所述防爆口23顶部固定有保护膜71。
请继续参阅图2至图7所示，所述极柱30包括有正极柱与负极柱，每个所述极柱30包括有柱体31、形成于所述柱体31上侧的接触部32、自所述柱体31中间部分沿径向外侧延伸形成的外凸部33及形成于所述柱体31下侧的连接部34。所述外凸部33位于所述接触部32与所述连接部34之间，所述接触部32的外径小于所述外凸部33的外径，所述连接部34的外径小于所述外 凸部33的外径，优选所述连接部34的外径小于所述接触部32的外径。所述接触部32顶面外周缘凹陷形成有凹边321，所述外凸部33外周形成有若干凸片331，相邻凸片331之间形成有若干凹口332。所述凸片331的数量不少于三个，且所述正极柱与负极柱的凸片331的数量不一致以便于区分所述正极柱与负极柱。所述正极柱采用一种材料，即铝合金制成。所述负极柱采用两种材料结合在一起，即接触部32与部分外凸部33采用铝合金材质，部分外凸部33与所述连接部34采用铜合金制成，二者可通过摩擦焊的方式结合在一起。而两种材料选择在所述外凸部33位置处结合的原因在于，所述外凸部33的截面积最大，在所述外凸部33处结合，可以有效增加两种材料的结合面积，增加结合力。在其他实施方式中，两种材料也可以选择其他结合位置。所述外凸部33的外周为倾斜面结构。
所述焊接环50包括贴合于所述凹陷部222表面的焊接底面51、自所述焊接底面51内侧斜向内上侧延伸形成的延伸壁52及自所述延伸壁52顶部向内折弯形成的压持部53。所述焊接底面51的外径不大于所述凹陷部222的内径并使所述焊接底面51的外周与所述凹陷部222的外侧贴合以精确定位，所述焊接底面51与凹陷部222的表面焊接固定在一起。所述延伸壁52斜向内上方延伸形成倾斜壁面，即底部的内径大于顶部的内径。所述延伸壁52上还贯通形成有若干流动孔521。所述压持部53向内侧还凸出形成有若干压持凸部531，相邻压持凸部531之间形成有若干避让槽532。所述压持凸部531处的内径小于所述极柱30的外凸部33的凸片331的外径且大于所述凹口332处的外径。而所述避让槽532处的内径大于所述凸片331处的外径。以便于所述极柱30的凸片331在对应所述避让槽532处时使所述极柱30向下进入所述焊接环50内，转动所述极柱30一定角度后使所述凸片331位于所述压持凸部531下方。且在垂直方向上的投影，所述凸片331与所述压持凸部531至少部分重叠。
所述密封圈40包括压接表面41、贯穿所述压接表面41形成的套孔42、自所述压接表面41径向两侧分别向下延伸形成的内侧壁43与外侧壁44及形 成于所述内侧壁43与所述外侧壁44之间的扣入槽45。所述内侧壁43垂直长度大于所述外侧壁44的垂直长度。所述密封圈40压入所述穿孔221周缘的凸边224上，即所述凸边224卡入扣入槽45内，所述外侧壁44伸入所述凹陷内环223内，所述内侧壁43贴覆于所述穿孔221的内壁面上。在具体实施时，所述凹陷内环223可以省略，直接使所述外侧壁44贴合在所述凹陷部222的表面上。
所述极柱30向下压接于所述密封圈40的压接表面41上，具体地，所述连接部34压入所述穿孔221内，并与所述穿孔221或所述凸边224的内壁面夹持所述密封圈40的内侧壁43。所述外凸部33的底面压接在所述密封圈40的压接表面41上。所述极柱30可通过穿孔221及其上的密封圈40实现预定位，所述极柱30的接触部32暴露于所述焊接环50的顶部外，所述极柱30的外凸部33与所述焊接环50的压持凸部531之间存在间隙而不接触。
所述绝缘本体60包括覆盖所述焊接环50上侧的顶壁61、自所述顶壁61内侧向下填充至所述焊接环50与所述极柱30之间的夹持部62、自所述顶壁61外侧向下填充覆盖所述焊接环50外侧的覆盖外壁63及形成于所述夹持部62与所述覆盖外壁63之间的容纳缝64。所述顶壁61覆盖所述极柱30的外凸部33上表面、焊接环50的压持部53表面，熔融塑胶自所述压持部53的避让槽532向下流入，同时填充所述压持凸部531与所述凸片331之间的空隙，同时沿所述凹口332继续向下流动，而所述延伸壁52上的流动孔521方便塑胶流穿越所述夹持部62与所述覆盖外壁63并部分使之连接为一体。所述夹持部62包括位于上部并压覆于所述极柱30的外凸部33上表面的第一夹持部621及渗入所述凹陷部222表面并夹持于所述延伸壁52与所述极柱30外周的第二夹持部622。所述覆盖外壁63包括覆盖于所述延伸壁52外侧面的第一覆盖外壁631及覆盖于所述焊接地面51上侧与所述凹陷边缘225上的第二覆盖外壁632。所述容纳缝64的形状拟合所述延伸壁52的形状，呈倾斜结构，当所述绝缘本体60固化后，所述夹持部62至少在垂直方向上受到所述外凸部33与 所述压持部53的夹持力以使所述极柱30被固定限位。同时，所述焊接环50的压持凸部531与所述极柱30的外凸部33的凸片331直接在垂直方向上受力夹持，稳定固持所述极柱30于所述焊接环50与所述凸边224或所述凹陷部222之间。
本申请动力电池顶盖的制造方法包括如下步骤：
S10、提供前述设有极柱孔22的盖板20及焊接环50，将所述焊接环50的焊接底面51焊接于所述极柱孔22的凹陷部222表面上；
本步骤中，所述焊接环50的焊接底面51贴合于所述凹陷部222表面上，从所述焊接底面51的上侧通过点焊或者其他方式将所述焊接环50焊接固定于所述极柱孔22上。
S20、将所述密封圈40与所述极柱30向下组装至所述极柱孔22与所述焊接环50内；
本步骤中，第一种组装方式为，先将所述密封圈40单独组装至极柱孔22外周的凸边224上，并压紧所述密封圈40；随后，将所述极柱30向下压入，并使所述极柱30的连接部34压入所述密封圈40的套孔42内预定位，所述极柱30组装过程中，所述极柱30的外凸部33的凸片331对应所述压持部53的避让槽532以使所述极柱30的凸片331避开所述压持部53的压持凸部531进入所述焊接环50内，再将所述极柱30转动一定角度使所述凸片331移动至所述压持凸部531下方，最后，将所述极柱30的连接部34预固定至所述密封圈40的套孔42内。
第二种组装方式为，先将所述密封圈40套入所述极柱30的连接部34外周；再将所述极柱30与所述密封圈40的组合体压入所述焊接环50内并使所述密封圈40的扣入槽45包裹于所述穿孔221外周的凸边224上。此组装方式同上，先使所述外凸部33的凸片331对应所述压持部53的避让槽532以使所述极柱30顺利进入所述焊接环50内，再将所述极柱30与密封圈40的组合体转动一定角度，使所述凸片331位于所述压持凸部531的下方；最后，将所述 极柱30与密封圈40的组合体下压，使所述密封圈40的扣入槽45包裹于所述穿孔221外周的凸边224上。
S30、将焊接有焊接环50的盖板20、极柱30与密封圈40的组合体进行模内注塑成型形成所述绝缘本体60；所述绝缘本体60将所述极柱30固定于所述极柱孔22的凸边224与所述焊接环50的压持部53之间；
本步骤中，所述熔融塑胶渗入所述极柱30外侧与所述焊接环50内外侧固化形成，所述绝缘本体60包括覆盖于所述极柱30外凸部33上侧与所述压持部53上侧的顶壁61、连接所述顶壁61固化于所述极柱30外周与所述延伸壁52之间的夹持部62及覆盖于所述焊接环50外表面的覆盖外壁63。
在一实施例中，所述极柱孔22外周仅保留向上的凸边224，而所述凹陷部222取消，直接以所述板体21的上表面作为塑胶结合面，所述凸边224的顶部高于所述板体21的上表面，此实施方式不是最优方案，会造成焊接所述焊接环50时存在定位困难，且使所述极柱30凸出所述板体21的高度加大，影响外观，但是若制造工艺足够精确，本实施方式仍是可选项之一。
本申请动力电池顶盖及其制造方法通过在所述极柱孔22的外周设置向上凸出的凸边224，在所述凸边224外周焊接固定焊接环50，在所述凸边224上套设密封圈40，将极柱30向下装入所述焊接环50内并压紧所述密封圈40实现防水，而后通过注塑成型所述绝缘本体60将所述极柱30固定于所述凸边224与所述焊接环50内，该结构密封性能好，且结构稳定牢固。
以上实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上实施例仅表达了本发明的优选的实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改 进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。
Claims (23)
- 一种动力电池顶盖，其特征在于，包括设有极柱孔的盖板、焊接于所述极柱孔外周的焊接环、密封圈、极柱及将所述极柱一体成型固定于所述极柱孔与焊接环内的绝缘本体，所述极柱孔包括穿孔及自所述穿孔边缘向上凸出形成的凸边，所述密封圈套设于所述凸边上，所述极柱包括柱体、形成于所述柱体上部的接触部、形成于所述柱体下部的连接部及自所述柱体沿径向外侧延伸形成的抵持于所述密封圈上的外凸部，所述焊接环包括焊接固定于所述穿孔外周的盖板上的焊接底面、自所述焊接底面内侧斜向内上方延伸形成的延伸壁及自所述延伸壁顶部向内折弯形成的压持部，所压持部至少部分在垂直投影方向上与所述外凸部重合，所述绝缘本体填充所述极柱与所述焊接环之间的空间。
- 如权利要求1所述的动力电池顶盖，其特征在于，所述盖板在极柱孔外周还向下凹陷形成有位于所述凸边周缘的凹陷部，所述密封圈包括位于所述凸边上侧的压接表面、贯穿所述压接表面形成的供所述极柱的连接部套入的套孔、自所述压接表面内外两侧向下延伸形成的内侧壁、外侧壁及形成于所述内侧壁与外侧壁之间的容纳所述凸边的扣入槽，所述密封圈通过所述套孔套设于所述连接部外周并定位所述极柱，所述焊接环焊接于所述凹陷部内。
- 如权利要求2所述的动力电池顶盖，其特征在于，所述极柱的外凸部底面压持在所述密封圈的压接表面上并与所述凸边挤压所述压接表面实现密封，所述凸边周缘还包括自所述凹陷部向下凹陷形成的凹陷内环，所述凹陷内环的表面低于所述凹陷部的表面，所述外侧壁的底面进入所述凹陷内环内限位。
- 如权利要求3所述的动力电池顶盖，其特征在于，所述焊接环的焊接底面被限位于所述凹陷部内并焊接固定于所述凹陷部的表面上，所述延伸壁为倾斜结构，所述压持部是自所述延伸壁顶端向内折弯形成，所述压持部的内径小于所述焊接底面的内径。
- 如权利要求4所述的动力电池顶盖，其特征在于，所述压持部包括向内凸出形成的若干压持凸部及形成于相邻压持凸部之间的避让槽，所述极柱的外 凸部包括向外凸出形成若干凸片及形成于相邻凸片之间的若干凹口，所述极柱组装至所述焊接环内后，所述外凸部与所述压持凸部之间存在间隔空隙。
- 如权利要求5所述的动力电池顶盖，其特征在于，所述凸片的外径大于所述压持凸部的内径且小于所述避让槽的内径，所述极柱的凸片对应所述避让槽位置处装入所述焊接环内后，所述极柱转动一定角度使所述凸片至少部分位于所述压持凸部下方，所述凸片与所述压持凸部在垂直方向上的投影至少部分重叠。
- 如权利要求1所述的动力电池顶盖，其特征在于，所述绝缘本体包括顶壁及自所述顶壁延伸并固化于所述极柱与所述焊接环之间的夹持部，所述夹持部包括压持于所述外凸部上方的第一夹持部及自所述第一夹持部向下延伸固化于所述外凸部、密封圈外周与所述延伸壁之间的第二夹持部。
- 如权利要求7所述的动力电池顶盖，其特征在于，所述绝缘本体还包括自所述顶壁延伸并覆盖所述焊接环外侧的覆盖外壁，所述绝缘本体的顶壁覆盖所述外凸部上侧的接触部外周、压持部上侧。
- 如权利要求8所述的动力电池顶盖，其特征在于，所述压持部包括向内凸出形成的若干压持凸部及形成于相邻压持凸部之间的避让槽，所述极柱的外凸部包括向外凸出形成若干凸片及形成于相邻凸片之间的若干凹口，所述极柱组装至所述焊接环内后，所述外凸部与所述压持凸部之间存在间隔空隙，注塑成型所述绝缘本体时，所述外凸部外侧的凹口对应所述压持部边缘的避让槽并形成上下联通的流动通道，所述流动通道便于塑胶自上而下顺畅填充所述极柱与焊接环之间的空间。
- 如权利要求9所述的动力电池顶盖，其特征在于，所述延伸壁上贯穿形成有流动孔，塑胶通过所述流动孔流动并将所述覆盖外壁与所述夹持部连接为一体，所述延伸壁包裹于所述夹持部与所述覆盖外壁之间。
- 一种动力电池顶盖，其特征在于，包括设有极柱孔的盖板、焊接于所述极柱孔外周的焊接环、密封圈、极柱及将所述极柱一体成型固定于所述极柱孔与焊接环内的绝缘本体，所述极柱孔包括穿孔、自所述盖板表面凹陷形成于所 述穿孔外周的凹陷部及自所述凹陷部边缘向上凸出形成的凸边，所述密封圈套设于所述凸边上，所述极柱包括柱体、形成于所述柱体上部的接触部、形成于所述柱体下部且套入所述密封圈内的连接部及自所述柱体中间沿径向外侧延伸形成的抵持于所述密封圈上的外凸部，所述焊接环包括焊接固定于所述凹陷部内的焊接底面、自所述焊接底面内侧斜向内上方延伸形成的延伸壁及自所述延伸壁顶部向内折弯形成的压持部，所述绝缘本体包括顶壁、连接所述顶壁并固化于所述极柱与所述焊接环之间的夹持部及连接所述顶壁并覆盖所述焊接环外侧的覆盖外壁。
- 如权利要求11所述的动力电池顶盖，其特征在于，所述凸边的顶部高于所述凹陷部的表面，所述密封圈包括位于所述凸边上侧的压接表面、贯穿所述压接表面形成的供所述极柱的连接部套入的套孔、自所述压接表面内外两侧向下延伸形成的内侧壁，外侧壁及形成于所述内侧壁与外侧壁之间的容纳所述凸边的扣入槽，所述极柱的连接部挤入所述套孔内并与所述穿孔内壁面夹持所述内侧壁。
- 如权利要求12所述的动力电池顶盖，其特征在于，所述极柱的外凸部底面压持在所述密封圈的压接表面上并与所述凸边挤压所述压接表面实现密封，所述凸边周缘还包括自所述凹陷部向下凹陷形成的凹陷内环，所述凹陷内环的表面低于所述凹陷部的表面，所述外侧壁的底面进入所述凹陷内环内限位。
- 如权利要求11所述的动力电池顶盖，其特征在于，所述焊接环的焊接底面被限位于所述凹陷部内并焊接固定于所述凹陷部的表面上，所述延伸壁为倾斜结构，所述压持部是自所述延伸壁顶端向内折弯形成，所述压持部的内径小于所述焊接底面的内径。
- 如权利要求14所述的动力电池顶盖，其特征在于，所述压持部包括向内凸出形成的若干压持凸部及形成于相邻压持凸部之间的避让槽，所述极柱的外凸部包括向外凸出形成若干凸片及形成于相邻凸片之间的若干凹口，所述极柱组装至所述焊接环内后，所述外凸部与所述压持凸部之间存在间隔空隙。
- 如权利要求15所述的动力电池顶盖，其特征在于，所述凸片的外径大 于所述压持凸部的内径且小于所述避让槽的内径，所述极柱的凸片对应所述避让槽位置处装入所述焊接环内后，所述极柱转动一定角度使所述凸片至少部分位于所述压持凸部下方，所述凸片与所述压持凸部在垂直方向上的投影至少部分重叠。
- 如权利要求16所述的动力电池顶盖，其特征在于，所述极柱的连接部套入所述密封圈内，所述密封圈固定于所述穿孔外的凸边上时，所述极柱被预定位并进行模内注塑成型形成所述绝缘本体，所述绝缘本体的顶壁覆盖所述外凸部上侧的接触部外周、压持部上侧，所述夹持部包括压持于所述外凸部上方的第一夹持部及自所述第一夹持部向下延伸固化于所述外凸部、密封圈外周与所述延伸壁之间的第二夹持部。
- 如权利要求17所述的动力电池顶盖，其特征在于，所述凹陷部外周形成有自所述盖板表面向下凹陷形成的凹陷边缘，所述凹陷边缘的表面高于所述凹陷部的表面，所述覆盖外壁包括覆盖所述延伸壁外侧的第一覆盖外壁及自所述第一覆盖外壁底部延伸并覆盖所述凹陷边缘的第二覆盖外壁。
- 如权利要求16所述的动力电池顶盖，其特征在于，注塑成型所述绝缘本体时，所述外凸部外侧的凹口对应所述压持部边缘的避让槽并形成上下联通的流动通道，所述流动通道便于所述塑胶自上而下顺畅填充所述极柱与焊接环之间的空间。
- 如权利要求19所述的动力电池顶盖，其特征在于，所述延伸壁上贯穿形成有流动孔，塑胶通过所述流动孔流动并将所述覆盖外壁与所述夹持部连接为一体，所述延伸壁包裹于所述夹持部与所述覆盖外壁之间。
- 一种动力电池顶盖的制造方法，其特征在于，包括如下步骤：S10、将一焊接环固定至一盖板上；所述焊接环包括焊接底面、自所述焊接底面内侧斜向上延伸形成的的延伸壁及自所述延伸壁顶部向内折弯形成的压持部，所述盖板设有极柱孔，所述盖板位于所述极柱孔外周向下凹陷形成有凹陷部，所述焊接底面焊接于所述凹陷部上，所述凹陷部位于所述极柱孔周缘向上凸出形成有凸边；S20、将一密封圈与一极柱向下组装至所述极柱孔与所述焊接环内，所述密封圈被夹持于所述极柱的下表面与所述极柱孔外周的凸边之间；S30、将焊接有焊接环的盖板、极柱与密封圈的组合体进行模内注塑成型形成一绝缘本体；所述绝缘本体将所述极柱固定于所述极柱孔的凸边与所述焊接环的压持部之间。
- 如权利要求21所述的动力电池顶盖制造方法，其特征在于，步骤S20包括：先将所述密封圈单独组装至极柱孔外周的凸边上，并压紧所述密封圈；随后，将所述极柱向下压入，所述极柱下侧设有的连接部压入所述密封圈内预定位；所述极柱顶部设有接触部，极柱中间向外凸出形成有外凸部，所述外凸部包括若干继续向外凸出形成的凸片及形成于相邻凸片之间的凹口，所述压持部包括若干继续向内凸出形成的压持凸部及形成于相邻压持凸部之间的避让槽，组装时，所述极柱的凸片对应所述压持部的避让槽以使所述凸片避开所述压持凸部进入所述焊接环内，再将所述极柱转动一定角度使所述凸片移动至所述压持凸部下方。
- 如权利要求21所述的动力电池顶盖制造方法，其特征在于，步骤S20包括：所述极柱包括柱体、形成于所述柱体下侧的连接部、形成于所述柱体上侧的接触部及自所述柱体中间向外凸出形成的外凸部，先将所述密封圈套入所述极柱的连接部外周；再将所述极柱与所述密封圈的组合体压入所述焊接环内并使所述密封圈包裹于所述穿孔外周的凸边上，所述密封圈被夹持于所述极柱的外凸部与所述凸边之间；所述外凸部包括若干继续向外凸出形成的凸片及形成于相邻凸片之间的凹口，所述压持部包括若干继续向内凸出形成的压持凸部及形成于相邻压持凸部之间的避让槽，组装时，所述极柱的凸片对应所述压持部的避让槽以使所述凸片避开所述压持凸部进入所述焊接环内，再将所述极柱转动一定角度使所述凸片移动至所述压持凸部下方。
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