Cover plate arrangement, battery and battery pack

Abstract

Cover plate arrangement comprising a cover plate (100) and a seal (200); wherein the cover plate (100) is provided with a first through hole (110), and the seal (200) is inserted into the first through hole (110); wherein the seal (200) has a first end face (2001) and a second end face (2002) opposite each other along a direction perpendicular to the cover plate (100), wherein the seal (200) is provided with a first groove (210) extending from the second end face (2002) in the direction of the first end face (2001), wherein the outer side wall of the seal (200) facing the second end face (2002) is provided with a first projection (220) extending parallel to the cover plate (100) and projecting from the surface of the cover plate (100), and wherein the distance from the edge of the first projection (220) to the axis of the first through hole (110) is greater than the radius of the first through hole (110).

Description

FIELD OF APPLICATIONThe present application relates to the technical field of batteries, specifically, to a cover plate assembly, a battery, and a battery pack.PRIOR ARTThe cover plate assembly of a battery typically needs to be provided with a liquid fill hole and an explosion-proof valve hole on the cover plate, the liquid injection hole is used to inject electrolyte into the interior of the battery, and the explosion-proof valve hole is used to discharge the gas generated in the battery and thus prevent explosion of the battery.In related technologies, the liquid fill hole and the explosion-proof valve hole of the battery cover plate assembly are typically separately disposed.DISCLOSURE OF THE INVENTIONTechnical ProblemHowever, this configuration results in the liquid filling hole requiring welding with a gasket after the electrolyte is injected, and the explosion-proof valve hole needs to be welded with an explosion-proof valve plate, and there are many technological processes, and the positions of the lower resin member and the current collector plate in the cover plate assembly corresponding to the liquid filling hole and the explosion-proof valve hole needs to be avoided, which increases the process complexity of the lower resin member and the current collector plate, increases the production cost, and decreases the battery mounting efficiency.Technical SolutionIn the first aspect, the present application provides a cover plate assembly. It comprises a cover plate and a gasket; wherein the cover plate is provided with a first through hole, and the gasket is inserted into the first through hole;wherein the gasket has a first end face and a second end face opposed to each other along a direction perpendicular to the cover plate, wherein the gasket is provided with a first groove extending from the second end face toward the first end face, wherein the outer side wall of the gasket facing the second end face is provided with a first protrusion extending parallel to the cover plate and protruding from the surface of the cover plate, and wherein the distance from the edge of the first protrusion to the axis of the first through hole is larger than the radius of the first through hole.In the second aspect, the present application provides a battery. It comprises a housing, a cell and a cover plate assembly above, wherein the interior of the housing has a receiving cavity, the cell is accommodated in the receiving cavity, an end of the housing has an opening, the cover plate assembly covers the opening and the opening of the first groove is oriented towards the cell.In the third aspect, the present application provides a battery pack. It comprises a battery box and a battery above, wherein the battery is arranged in the battery box.Advantageous Effects:Advantageous Effects of the Exemplary Embodiments of the Present Application:The embodiment of the application provides a cover plate assembly, a battery, and a battery pack. By disposing a first through hole in the cover plate, using the first through hole as a liquid filling hole and an explosion-proof hole, and covering the first through hole by a gasket after injecting electrolyte into the first through hole, when a large amount of gas is generated inside the battery, the gas of a certain pressure acts on the inside of the first groove of the gasket so that the first protrusion moves radially toward the center of the first through hole, thus the gasket is ejected from the first through hole by the gas in the battery and protrudes from the first through hole to achieve the effect of gas discharge and explosion-proof. In this application, the explosion-proof valve hole and the liquid filling hole are integrated into one hole, and the seal structure is optimized to prevent explosion while ensuring good sealing performance, reducing production cost, and improving battery assembly efficiency.SUMMARY OF THE INVENTIONFIG. 1 is a schematic sectional structure diagram of a cover plate assembly provided in the embodiment of the present application; FIG. 2 is a schematic sectional structure diagram of a gasket of the cover plate assembly provided in the embodiment of the present application; FIG. 3 is a schematic sectional structure diagram of a cover plate of the cover plate assembly provided in the embodiment of the present application.Embodiments of the InventionAs shown in FIGS. 1 to 3, the application provides a cover plate assembly including a cover plate 100 and a gasket 200; the cover plate 100 is provided with a first through hole 110, the gasket 200 penetrates the first through hole 110, and the first through hole 110 is formed as a liquid filling hole and an explosion-proof hole;wherein the gasket 200 has a first end face 2001 and a second end face 2002 that are opposed to each other along a direction perpendicular to the cover plate 100, wherein the gasket 200 is provided with a first groove 210 extending from the second end face 2002 toward the first end face 2001, wherein the outer side wall of the gasket 200 facing the second end face 2002 is provided with a first protrusion 220 extending parallel to the cover plate 100 and protruding from the surface of the cover plate 100, and wherein the distance from the edge of the first protrusion 220 to the axis of the first through hole 110 is larger than the radius of the first through hole 110. The first protrusion 220 is used for fixing the gasket 200 to the cover plate 100.In this embodiment, the first through hole 110 is connected to the inside of the battery and is used for injecting electrolyte into the inside of the battery, and the first through hole 110 is also used for exhausting the gas generated inside the battery from the battery to prevent explosion of the battery.Specifically, after assembling the cover plate 100 to the case of the battery, with the open side of the first groove 210 facing the inside of the case during assembly, an electrolyte is filled into the case through the first through hole 110, and after the liquid filling is completed, the gasket 200 is inserted into the first through hole 110 to seal the first through hole 110. When a large amount of gas is generated in the housing, the gas acts on the inside of the first groove 210 with a certain pressure and generates a force perpendicular to the cover plate 100 on the first groove 210 so that the first protrusion 220 moves radially toward the center of the first through hole 110, i.e., the both ends of the packing 200 located on the second end surface 2002 shrink toward the center of the first groove 210, and the first protrusion 220 shrinks into the first through hole 110, and the packing 200 is jacked by the gas in the housing and protrudes from the first through hole 110, so that the gas in the housing is discharged from the battery via the first through hole 110, thus achieving the effect of gas discharge and explosion protection.The cross-sectional shape of the first bulge 220 may be triangular, but is not limited thereto. For example, a right triangle is conceivable. At this time, one right angle side of the first protrusion 220 abuts on the outer side wall of the gasket 200, another right angle side of the first protrusion 220 abuts on the surface of the cover plate 100, and the first protrusion 220 protrudes from the first through hole 110 and is used for fixing the gasket 200 to the cover plate 100.In this application, the explosion-proof valve hole and the liquid filling hole are integrated into one hole, and the structure of the gasket 200 is optimized to prevent explosion while ensuring good sealing performance, reducing production cost, and improving battery mounting efficiency.In an embodiment, the cover plate assembly further comprises a pole 300, a terminal 400, an upper plastic component 500, a current collector plate 800 and a lower plastic component 600; wherein the cover plate 100 is provided with a second through hole 120 and the pole 300 is inserted into the second through hole 120; wherein the terminal 400 is arranged at an end of the pole 300 facing the first end face 2001 and the upper plastic component 500 is arranged between the terminal 400 and the cover plate 100; wherein the current collector plate 800 is arranged at an end of the pole 300 facing the second end face 2002 and the lower plastic component 600 is arranged between the current collector plate 800 and the cover plate 100.Specifically, as shown in FIG. 1, the cover plate 100 has a first surface 101 and a second surface 102 facing away from each other. The second surface 102 faces the inside of the battery, the pole 300 is inversely T-shaped. An end of the larger-diameter pole 300 is located on the side of the second surface 102 opposite to the first surface 101, and an end of the smaller-diameter pole 300 passes through the second through hole 120 and protrudes from the first surface 101; the terminal 400 is disposed at an end of the pole 300 protruding from the first surface 101; the upper resin member 500 is disposed between the terminal 400 and the cover plate 100, and the upper resin member 500 is provided with a through hole, the pole 300 passes through the through hole, and the upper resin member 500 is used to insulate the terminal 400 and the cover plate 100 and simultaneously improve sealing performance; A seal ring 700 is disposed between the outer side wall of the pole 300 and the inner side wall of the second through hole 120, and the seal ring 700 is used for improving sealing performance between the pole 300 and the second through hole 120; the lower resin member 600 is disposed on the second surface 102 of the cover plate 100; the current collector plate 800 is disposed on the side of the larger diameter end of the pole 300 opposite to the second surface 102.In an embodiment, as shown in FIG. 1, a positioning hole 610 is disposed in the lower resin member 600, the positioning hole 610 faces and is connected to the first through hole 110, and a side of the cover plate 100 facing the lower resin member 600 is provided with a positioning protrusion 130 that cooperates with the positioning hole 610. The lower resin member 600 is used to prevent the short circuit caused by the contact between the current collector plate 800 and the cover plate 100, and therefore the lower resin member 600 is disposed between the current collector plate 800 and the cover plate 100 so that the two are insulated. The positioning protrusion 130 on the cover plate 100 is inserted into the positioning hole 610 on the lower resin member 600, so that the lower resin member 600 and the cover plate 100 are installed and positioned and the first through hole 110 is connected to the inside of the battery simultaneouslyIn an embodiment, as shown in FIGS. 2 to 3, the first through hole 110 is a stepped hole and its cross section is "T"-shaped, the first through hole 110 includes a first hole hole hole 111 and a second hole hole hole 112 which are stacked on each other. The diameter of the first hole hole hole 111 is larger than the diameter of the second hole hole hole 112, and there is a step 115 between the first hole hole hole 111 and the second hole hole hole 112.The cross section of the gasket 200 is "T"-shaped, the gasket 200 comprising a fixing portion 201 and a sealing portion 202 connected to the fixing portion 201, wherein the diameter of the fixing portion 201 is larger than the diameter of the sealing portion 202, the fixing portion 201 is accommodated in the first hole hole hole 111, and the sealing portion 202 is accommodated in the second hole hole hole 112. The diameter of the seal portion 202 is matched with the inner diameter of the second hole hole hole 112, so that the sealing performance of the seal 200 can be ensured when the seal portion 202 is accommodated in the second hole hole hole 112.When the first through hole 110 is a stepped bore, the distance from the edge of the first protrusion 220 to the axis of the second hole hole hole 112 is larger than the radius of the second hole hole hole 112, and the distance from the edge of the first protrusion 220 to the axis of the second hole hole hole 112 is smaller than the radius of the first hole hole hole 111 to prevent the first protrusion 220 from taking too much space while securing the fixing function of the first protrusion 220.In the first embodiment, as shown in FIGS. 2-3, a second protrusion 230 is disposed on the outer side wall of the seal portion 202, a second groove 113 cooperating with the second protrusion 230 is disposed on the inner wall of the second hole hole hole 112, and when the seal portion 202 is inserted into the second hole hole hole 112, the second protrusion 230 and the second groove 113 have an interference fit to improve the tightness of the seal portion 202, and the reliability of the connection between the seal 200 and the cover plate 100 is simultaneously improved.In the first embodiment, the second protrusion 230 is an annular protrusion surrounding the outer side wall of the seal portion 202, and the second groove 113 is an annular through groove surrounding the inner wall of the second hole hole hole 112, so that the sealing property of the seal portion 202 can be further improved.In other embodiments, a plurality of second protrusions 230 may be disposed on the outer side wall of the sealing portion 202, a plurality of second grooves 113 cooperating with the second protrusions 230 may be disposed on the inner wall of the second hole hole hole 112, the structure of the second protrusions 230 and the second grooves 113 is not limited to annular shapes.The second protrusion 230 may be a protrusion having a semicircular cross section, and the second groove 113 may be a groove having a semicircular cross section, for example, the radius of the semicircular protrusion and the semicircular groove may be set to 0.1-0.2 mm to facilitate assembly of the gasket 200 and the cover plate 100.Note that the cross section of the second protrusion 230 and the second groove 113 may have other shapes, and no specific limitations are imposed here.In the first embodiment, as shown in FIGS. 2 to 3, a side of the fixing portion 201 facing the second hole hole hole 112 is provided with a third protrusion 240, and a third groove 114 cooperating with the third protrusion 240 is disposed on a first hole hole hole 111 side of the step 115. When the gasket 200 is mounted in the first through hole 110, the third protrusion 240 is inserted into the third groove 114, so that the gasket 200 is fixed to the cover plate 100 and the gasket 200 is prevented from rotating circumferentially.A plurality of third protrusions 240 may be disposed on the mounting portion 201, and a plurality of third grooves 114 cooperating with the third protrusions 240 may be disposed on the step 115. For example, two third protrusions 240 may be disposed on the mounting portion 201, two third protrusions 240 are positioned on opposite two sides of the mounting portion 201, and two third grooves 114 that match the third protrusions 240 are disposed on the step 115. The height of the third protrusion 240 may be 1 / 2-2 / 3 of the depth of the first through hole 110, and the depth of the third groove 114 corresponds to the depth of the third protrusion 240 to ensure the positioning function of the third protrusion 240.In an embodiment, as shown in FIG. 3, the side wall 1111 of the first hole hole hole 111 is an inclined surface, the angle between the side wall 1111 of the first hole hole hole 111 and the plane on which the cover plate 100 is located is 30° to 45°, and the diameter of the first hole hole hole 111 is larger than the diameter of the fixing portion 201, so that a certain gap remains between the side wall 1111 of the first hole hole hole 111 and the side surface of the fixing portion 201, and the side wall 1111 of the first hole hole hole hole 111 is obliquely disposed, so that the gasket 200 is conveniently lifted out of the gap with a tool to facilitate replacement or repair of the gasket 200 or battery venting for pressure releaseIn the first embodiment, as shown in FIG. 2, an end of the side surface of the fixing portion 201 facing the second hole hole hole 112 is provided with a chamfer 250 so that the gasket 200 can be lifted with a tool.In an embodiment, as shown in FIG. 3, along the direction perpendicular to the cover plate 100, the depth of the first hole hole hole 111 is less than or equal to half the thickness of the cover plate 100, and the sealing performance and stability of the seal 200 are guaranteed while facilitating the use of a tool for raising the seal 200.The present application further provides a battery comprising a housing, a cell and a cover plate assembly described above. The interior of the housing has a holding cavity, and the cell is accommodated in the accommodating cavity; one end of the housing has an opening, and the cover plate assembly covers the opening with the opening side of the first groove 210 facing the cover plate assembly of the cell, and when a large amount of gas accumulates inside the battery, the gas of a certain pressure acts on the interior of the first groove 210 so that the gasket 200 is jacked up from the first through hole 110 to realize pressure relief for explosion protection. At the same time, the first through hole 110 is also used as a liquid filling hole, and the electrolyte is injected from the first through hole 110 into the case to realize the battery electrolyte filling.The housing may be cylindrical and the battery may be a cylindrical battery, but is not limited thereto.The application further provides a battery pack including a battery box and a battery above, and the battery is disposed in the battery box.The embodiment of the application provides a cover plate assembly, a battery, and a battery pack. By disposing a first through hole in the cover plate, using the first through hole as a liquid filling hole and an explosion-proof hole, and covering the first through hole by a gasket after injecting electrolyte into the first through hole, the gas of a certain pressure acts when a large amount of gas generates inside the battery

Claims

A cover plate assembly comprising a cover plate (100) and a seal (200); wherein the cover plate (100) is provided with a first through hole (110), and the seal (200) is inserted into the first through hole (110); wherein the gasket (200) has a first end face (2001) and a second end face (2002) opposing each other along a direction perpendicular to the cover plate (100), wherein the gasket (200) is provided with a first groove (210) extending from the second end face (2002) toward the first end face (2001), wherein the outer side wall of the gasket (200) facing the second end face (2002) is provided with a first protrusion (220) extending parallel to the cover plate (100) and protruding from the surface of the cover plate (100), and wherein the distance from the edge of the first protrusion (220) to the axis of the first through hole (110) is larger than the radius of the first through hole (110).The cover plate assembly according to claim 1, wherein the first through hole (110) is a stepped hole comprising a first hole opening (111) and a second hole opening (112) overlaid on each other, wherein the diameter of the first hole opening (111) is larger than the diameter of the second hole opening (112), and a step (115) exists between the first hole opening (111) and the second hole opening (112); wherein the gasket (200) comprises a fixing portion (201) and a sealing portion (202) connected to the fixing portion (201), wherein the diameter of the fixing portion (201) is larger than the diameter of the sealing portion (202), the fixing portion (201) is disposed in the first hole opening (111), and the sealing portion (202) is disposed in the second hole opening (112).The cover plate assembly of claim 2, wherein a second protrusion (230) is disposed on the outer sidewall of the sealing portion (202), and a second groove (113) cooperating with the second protrusion (230) is disposed on the inner wall of the second hole opening (112).The cover plate assembly according to claim 3, wherein the second protrusion (230) is an annular protrusion surrounding the outer side wall of the sealing portion (202), and the second groove (113) is an annular through groove surrounding the inner wall of the second hole opening (112).Cover plate arrangement according to one of claims 2 to 4, wherein a side of the fastening portion (201) facing the second hole opening (112) is provided with a third protrusion (240), and a third groove (114), which interacts with the third protrusion (240), is arranged on a side of the step (115) facing the first hole opening (111).The cover plate assembly according to any one of claims 2 to 5, wherein the side wall of the first hole opening (111) is an inclined surface, the angle between the side wall of the first hole opening (111) and the plane in which the cover plate (100) is located is 30° to 45°, and the diameter of the first hole opening (111) is larger than the diameter of the fixing portion (201).Cover plate arrangement according to claim 6, wherein an end of the side surface of the fastening portion (201) facing the second hole opening (112) is provided with a chamfer (250).The cover plate assembly according to any one of claims 2 to 7, wherein along the direction perpendicular to the cover plate (100), the depth of the first hole opening (111) is less than or equal to half the thickness of the cover plate (100).The cover plate assembly according to any one of claims 1 to 8, wherein the cover plate assembly further comprises a pole (300), a terminal (400), an upper plastic component (500), a current collector disc (800), and a lower plastic component (600); wherein the cover plate (100) is provided with a second through hole (120), and the pole (300) is inserted into the second through hole (120); wherein the terminal (400) is disposed at an end of the pole (300) facing the first end face (2001), and the upper plastic component (500) is disposed between the terminal (400) and the cover plate (100); wherein the current collector disc (800) is disposed at an end of the pole (300) facing the second end face (2002), and the lower plastic component (600) is disposed between the current collector disc (800) and the cover plate (100).The cover plate assembly according to claim 9, wherein a positioning hole 610 is disposed in the lower resin member (600), the positioning hole 610 is opposite to and connected to the first through hole (110), and a side of the cover plate (100) facing the lower resin member (600) is provided with a positioning protrusion (130) that cooperates with the positioning hole (610).A battery comprising a housing, a cell, and a cover plate assembly according to any one of claims 1 to 10, wherein the interior of the housing has a receiving cavity, the cell is accommodated in the receiving cavity, an end of the housing has an opening, the cover plate assembly covers the opening, and the opening of the first groove (210) is oriented toward the cell.A battery pack comprising a battery box and a battery according to claim 11, wherein the battery is disposed in the battery box.

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