Cover plate assembly, battery and battery pack

Abstract

The present disclosure provides a cover plate assembly, a battery, and a battery pack, the cover plate assembly including a cover plate and a sealing element, the cover plate having a first through hole, the sealing element penetrating the first through hole, the sealing element having opposing first and second end faces, the sealing element having a first recess extending from the second end face, and a first protrusion on an outer wall of the sealing element close to the second end face, the first protrusion protruding from the surface of the cover plate, and the distance from the edge of the first protrusion to the axis of the first through hole is greater than the radius of the first through hole.

Description

[Technical Field]

[0001] This disclosure claims priority to a Chinese patent disclosure filed with the China Patent Office on August 4, 2023, bearing application number 202322099003.2, the entire contents of which are incorporated herein by reference. The present disclosure relates to the field of battery technology, and in particular to cover plate assemblies, batteries, and battery packs. [Background technology]

[0002] A battery cover plate assembly usually requires the installation of a liquid filling hole and an explosion-proof valve hole on the cover plate. The liquid filling hole is used to inject electrolyte into the battery, and the explosion-proof valve hole is used to exhaust gas generated inside the battery to prevent the battery from exploding.

[0003] In the prior art, the liquid filling hole and the explosion-proof valve hole of the battery cover plate assembly are usually installed separately. Summary of the Invention [Problem to be solved by the invention]

[0004] However, with this type of setup, after the electrolyte is injected into the filling hole, a sealing part needs to be welded, and an explosion-proof valve sheet needs to be welded to the explosion-proof valve hole, which requires many processes. In addition, the lower plastic part and bus plate of the cover plate assembly need to be positioned away from the filling hole and the explosion-proof valve hole, which increases the process complexity of the lower plastic part and bus plate, increases production costs, and reduces battery assembly efficiency. [Means for solving the problem]

[0005] In a first aspect, the present disclosure provides a cover plate assembly including a cover plate and a sealing element, the cover plate having a first through hole, the sealing element extending through the first through hole, the sealing element having first and second end faces facing each other along a direction perpendicular to the cover plate, the sealing element having a first recess extending from the second end face toward the first end face, and a first protrusion extending in a direction parallel to the cover plate on an outer wall of the sealing element near the second end face, the first protrusion protruding from a surface of the cover plate, and a distance from an edge of the first protrusion to an axis of the first through hole greater than a radius of the first through hole.

[0006] In a second aspect, the present disclosure provides a battery including a housing, a cell, and the cover plate assembly, wherein the housing has a receiving cavity therein, the cell is received in the receiving cavity, the housing has an opening at one end, the cover plate assembly closes the opening, and the opening of a first recess faces the cell.

[0007] In a third aspect, the present disclosure provides a battery pack, the battery pack including a battery box and the battery, the battery being disposed in the battery box. [Effects of the Invention]

[0008] The beneficial effects of the disclosed embodiments are as follows: The disclosed embodiments provide a cover plate assembly, a battery, and a battery pack, in which a first through-hole is provided in the cover plate, and the first through-hole serves as both an inlet and an explosion-proof hole. After electrolyte is injected into the first through-hole, the first through-hole is sealed using a sealing element. When a large amount of gas is generated inside the battery, a certain amount of gas acts on the first recess of the sealing element, causing the first protrusion to move radially toward the center of the first through-hole. As a result, the sealing element is pushed up from inside the first through-hole by the gas inside the battery and protrudes out of the first through-hole, thereby achieving an exhaust explosion-proof function. The disclosed embodiments combine the explosion-proof valve hole and the inlet into a single hole, optimizing the structure of the sealing element to ensure good sealing effect while also achieving explosion-proof function, reducing production costs and improving battery assembly efficiency. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional structural view of a cover plate assembly provided by an embodiment of the present disclosure; [Figure 2] 1 is a cross-sectional structural view of a sealing component of a cover plate assembly provided by an embodiment of the present disclosure; [Figure 3] 1 is a cross-sectional structural view of a cover plate of a cover plate assembly provided by an embodiment of the present disclosure; DETAILED DESCRIPTION OF THE INVENTION

[0010] As shown in Figures 1 to 3, the present disclosure provides a cover plate assembly, which includes a cover plate 100 and a sealing element 200, in which a first through hole 110 is provided in the cover plate 100, the sealing element 200 is installed through the first through hole 110, and the first through hole 110 is installed in an inlet hole and an explosion-proof hole. The sealing element 200 includes a first end surface 2001 and a second end surface 2002 facing each other along a direction perpendicular to the cover plate 100. The sealing element 200 has a first recess 210 extending from the second end surface 2002 toward the first end surface 2001. The sealing element 200 has a first protrusion 220 extending in a direction parallel to the cover plate 100 on an outer wall near the second end surface 2002 of the sealing element 200. The first protrusion 220 protrudes from the surface of the cover plate 100, and the distance from the edge of the first protrusion 220 to the axis of the first through hole 110 is greater than the radius of the first through hole 110. The first protrusion 220 is used to fix the sealing element 200 and the cover plate 100.

[0011] In this embodiment, the first through hole 110 is connected to the inside of the battery and is used to inject electrolyte into the battery, as well as to exhaust gas generated inside the battery to the outside, thereby preventing the battery from exploding.

[0012] Specifically, after the cover plate 100 is assembled with the battery housing, the opening side of the first recess 210 faces the inside of the housing during assembly, and electrolyte is injected into the housing through the first through hole 110. After the injection is completed, the sealing part 200 is inserted into the first through hole 110 to seal the first through hole 110. When a large amount of gas is generated inside the housing, a certain amount of gas acts on the first recess 210, generating a force on the first recess 210 perpendicular to the cover plate 100. This causes the first protrusion 220 to move radially toward the center of the first through hole 110, i.e., the two ends of the sealing element 200 located on the second end face 2002 contract toward the center of the first recess 210. After the first protrusion 220 contracts inside the first through hole 110, the sealing element 200 is pushed up by the gas inside the housing and protrudes out of the first through hole 110, and the gas inside the housing is discharged through the first through hole 110 to the outside of the battery, thereby achieving the function of exhaust explosion prevention.

[0013] The cross-sectional shape of the first protrusion 220 may be, but is not limited to, a triangle. For example, it may be a right-angled triangle, with one right-angled side of the first protrusion 220 in close contact with the outer wall of the seal component 200 and another right-angled side of the first protrusion 220 in close contact with the surface of the cover plate 100, and the first protrusion 220 protruding out of the first through-hole 110 and used to secure the seal component 200 and the cover plate 100 together.

[0014] The present disclosure combines the explosion-proof valve hole and the liquid inlet hole into one hole, optimizing the structure of the sealing element 200 to ensure good sealing effect while also fulfilling the explosion-proof function, reducing production costs and improving battery assembly efficiency.

[0015] In one embodiment, the cover plate assembly further includes a pole 300, a terminal 400, an upper plastic part 500, and a bus plate 800, wherein the cover plate 100 has a second through hole 120, the pole 300 is installed through the second through hole 120, the terminal 400 is installed at one end of the pole 300 close to the first end surface 2001, the upper plastic part 500 is installed between the terminal 400 and the cover plate 100, the bus plate 800 is installed at one end of the pole 300 close to the second end surface 2002, and the lower plastic part 600 is installed between the bus plate 800 and the cover plate 100.

[0016] Specifically, as shown in FIG. 1 , the cover plate 100 includes a first surface 101 and a second surface 102 facing each other, the second surface 102 facing the inside of the battery, the pole 300 has an inverted T shape, the larger-diameter end of the pole 300 is located on the second surface 102 away from the first surface 101, and the smaller-diameter end of the pole 300 passes through the second through-hole 120 and protrudes from the first surface 101, the terminal 400 is installed at the end of the pole 300 protruding from the first surface 101, the upper plastic part 500 is installed between the terminal 400 and the cover plate 100, and the upper plastic part a through hole is provided in the part 500, and the pole 300 passes through the through hole; the upper plastic part 500 is used to insulate the terminal 400 from the cover plate 100 and at the same time to improve the sealing performance; a sealing ring 700 is provided between the outer wall of the pole 300 and the inner wall of the second through hole 120, and the sealing ring 700 is used to improve the sealing performance between the pole 300 and the second through hole 120; a lower plastic part 600 is installed on the second surface 102 of the cover plate 100; and a bus plate 800 is installed on the side away from the second surface 102 at one end of the pole 300 with a larger diameter.

[0017] 1 , a positioning hole 610 is formed in the lower plastic part 600, and the positioning hole 610 faces and communicates with the first through-hole 110. A positioning protrusion 130 that matches the positioning hole 610 is formed on the side of the cover plate 100 closest to the lower plastic part 600. The lower plastic part 600 is used to prevent short circuits due to contact between the bus plate 800 and the cover plate 100, and therefore, the lower plastic part 600 is positioned between the bus plate 800 and the cover plate 100 to insulate them. The positioning protrusion 130 on the cover plate 100 is inserted into the positioning hole 610 on the lower plastic part 600 to position the lower plastic part 600 and the cover plate 100 and simultaneously communicate the first through-hole 110 with the interior of the battery.

[0018] In one embodiment, as shown in Figures 2 and 3, the first through hole 110 is a stepped hole, and the cross section of the first through hole 110 is "T" shaped, and includes a first hole portion 111 and a second hole portion 112 that are stacked together, the diameter of the first hole portion 111 is larger than the diameter of the second hole portion 112, and there is a step 115 between the first hole portion 111 and the second hole portion 112.

[0019] The cross section of the seal component 200 is "T" shaped, and the seal component 200 includes a fixed portion 201 and a sealing portion 202 connected to the fixed portion 201, the diameter of the fixed portion 201 being larger than the diameter of the sealing portion 202, the fixed portion 201 being accommodated in the first hole portion 111, and the sealing portion 202 being accommodated in the second hole portion 112. The diameter of the sealing portion 202 matches the inner diameter of the second hole portion 112, thereby ensuring the sealing performance of the seal component 200 when the sealing portion 202 is accommodated in the second hole portion 112.

[0020] When the first through hole 110 is a stepped hole, the distance from the edge of the first protrusion 220 to the axis of the second hole 112 is greater than the radius of the second hole 112, and the distance from the edge of the first protrusion 220 to the axis of the second hole 112 is less than the radius of the first hole 111, thereby ensuring the fixing function of the first protrusion 220 while preventing the space occupied by the first protrusion 220 from being too large.

[0021] In one embodiment, as shown in Figures 2 and 3, a second protrusion 230 is provided on the outer wall of the sealing portion 202, and a second recess 113 matching the second protrusion 230 is provided on the inner wall of the second hole portion 112. When the sealing portion 202 is inserted into the second hole portion 112, the second protrusion 230 and the second recess 113 are tightly fitted together, thereby improving the sealing performance of the sealing portion 202 and simultaneously increasing the reliability of the connection between the sealing part 200 and the cover plate 100.

[0022] In one embodiment, the second convex portion 230 is an annular convex portion that surrounds the outer wall of the sealing portion 202, and the second recessed groove 113 is an annular groove portion that surrounds the inner wall of the second hole portion 112, thereby further improving the sealing property of the sealing portion 202.

[0023] In another embodiment, a plurality of second protrusions 230 can be installed on the outer wall of the sealing portion 202, and a second recess 113 matching the plurality of second protrusions 230 can be installed on the inner wall of the second hole portion 112, and the structure of the second protrusions 230 and the second recess 113 is not limited to being annular.

[0024] The second protrusion 230 may be a protrusion having a semicircular cross section, and the second recess 113 may be a recess having a semicircular cross section, for example, a semicircular protrusion, and the radius of the semicircular recess can be set to 0.1 to 0.2 mm, which makes it easier to assemble the sealing part 200 and the cover plate 100.

[0025] The cross sections of the second convex portion 230 and the second concave portion 113 may have other shapes, and are not specifically limited here.

[0026] 2 and 3, a third protrusion 240 is provided on the side of the fixing part 201 closest to the second hole 112, and a third recess 114 matching the third protrusion 240 is provided on the side of the step 115 facing the first hole 111. When the sealing element 200 is assembled into the first through-hole 110, the third protrusion 240 is inserted into the third recess 114, thereby fixing the sealing element 200 and the cover plate 100 together and preventing the sealing element 200 from rotating in the circumferential direction.

[0027] A plurality of third protrusions 240 may be provided on the fixed portion 201, and a plurality of third recesses 114 that match the third protrusions 240 may be provided on the step 115. For example, two third protrusions 240 may be provided on the fixed portion 201, and the two third protrusions 240 may be located on opposite sides of the fixed portion 201, and two third recesses 114 that match the third protrusions 240 may be provided on the step 115. The height of the third protrusions 240 may be 1 / 2 to 2 / 3 of the depth of the first through-hole 110, and the depth of the third recesses 114 matches the depth of the third protrusions 240, ensuring the positioning function of the third protrusions 240.

[0028] In one embodiment, as shown in FIG. 3 , the side wall of the first hole portion 111 is an inclined surface, the included angle between the side wall 1111 of the first hole portion 111 and the plane on which the cover plate 100 is located is 30° to 45°, and the diameter of the first hole portion 111 is larger than the diameter of the fixing portion 201, thereby leaving a certain gap between the side wall 1111 of the first hole portion 111 and the side of the fixing portion 201. At the same time, the side wall 1111 of the first hole portion 111 is installed at an incline, making it easier to use a tool to lift the sealing element 200 from the gap, and facilitating replacement or repair of the sealing element 200 or release of the exhaust pressure of the battery.

[0029] In one embodiment, as shown in FIG. 2, a chamfer 250 is provided on one end of the side of the fixing portion 201 near the second hole portion 112, making it easier to lift the sealing component 200 using a tool.

[0030] In one embodiment, as shown in FIG. 3, the depth of the first hole portion 111 along the direction perpendicular to the cover plate 100 is less than half the thickness of the cover plate 100, thereby ensuring the sealing performance and stability of the seal element 200 while making it easier to lift the seal element 200 using a tool.

[0031] The present disclosure also provides a battery. The battery includes a housing, a cell, and the cover plate assembly. The housing has a receiving cavity, a cell received in the receiving cavity, an opening at one end of the housing, and a cover plate assembly sealing the opening. The opening of a first recess 210 of the cover plate assembly faces the cell. When a large amount of gas accumulates inside the battery, a certain amount of gas acts on the first recess 210, pushing the sealing element 200 up through the first through-hole 110, thereby realizing explosion-proof pressure relief. At the same time, the first through-hole 110 also functions as an electrolyte injection hole, allowing electrolyte to be injected into the housing through the first through-hole 110, thereby realizing battery injection.

[0032] The housing may be a cylindrical housing and the battery may be a cylindrical battery, but is not limited to this.

[0033] The present disclosure further provides a battery pack, which includes a battery box and the battery, the battery being disposed in the battery box.

[0034] The disclosed embodiments provide a cover plate assembly, a battery, and a battery pack, in which a first through-hole is provided in the cover plate, and the first through-hole serves as both an inlet and an explosion-proof hole. After electrolyte is injected into the first through-hole, the first through-hole is sealed using a sealing element. When a large amount of gas is generated inside the battery, a certain amount of gas acts on the first recess of the sealing element, causing the first protrusion to move radially toward the center of the first through-hole. As a result, the sealing element is pushed up from inside the first through-hole by the gas inside the battery and protrudes out of the first through-hole, thereby achieving an exhaust explosion-proof function. The disclosed embodiments combine the explosion-proof valve hole and the inlet into a single hole, optimizing the structure of the sealing element to ensure good sealing effect while also achieving explosion-proof function, reducing production costs and improving battery assembly efficiency. [Explanation of symbols]

[0035] 100 cover plate 101 1st surface 102 Second surface 110 1st hole 111 1st hole 112 2nd hole 113 Second concave tank 114 Third concave tank 115 steps 120 2nd hole 130 Convex 200 Sealing parts 201 Fixed part 202 Seal part 210 1st concave tank 220 First convex part 230 Second convex part 240 Third convex part 300 poles 400 terminals 500+ plastic parts 600 Lower plastic parts 610 holes 700 Seal Ring 800 Bus Plate 1111 Side wall 2001 1st end face 2002 2nd end face

Claims

1. 1. A cover plate assembly comprising: The sealing member (200) includes a cover plate (100) and a first through-hole (110) in the cover plate (100), and the sealing member (200) is installed through the first through-hole (110); The sealing element (200) has a first end surface (2001) and a second end surface (2002) facing each other along a direction perpendicular to the cover plate (100). The sealing element (200) has a first recess (210) extending from the second end surface (2002) toward the first end surface (2001). The sealing element (200) has a first protrusion (220) extending in a direction parallel to the cover plate (100) on an outer wall of the sealing element (200) close to the second end surface (2002). The first protrusion (220) protrudes from the surface of the cover plate (100). The distance from the edge of the first protrusion (220) to the axis of the first through hole (110) is greater than the radius of the first through hole (110).

1. A cover plate assembly comprising:

2. The first through hole (110) is a stepped hole, and includes a first hole portion (111) and a second hole portion (112) that are overlapped, the diameter of the first hole portion (111) is larger than the diameter of the second hole portion (112), and there is a step (115) between the first hole portion (111) and the second hole portion (112); The sealing component (200) includes a fixed portion (201) and a sealing portion (202) connected to the fixed portion (201), the diameter of the fixed portion (201) is larger than the diameter of the sealing portion (202), the fixed portion (201) is installed in the first hole portion (111), and the sealing portion (202) is installed in the second hole portion (112). The cover plate assembly of claim 1 .

3. A second protrusion (230) is provided on the outer wall of the sealing portion (202), and a second recess (113) matching the second protrusion (230) is provided on the inner wall of the second hole portion (112). The cover plate assembly of claim 2 .

4. The second convex portion (230) is an annular convex portion surrounding the outer wall of the sealing portion (202), and the second recess (113) is an annular groove portion surrounding the inner wall of the second hole portion (112). The cover plate assembly of claim 3 .

5. A third protrusion (240) is provided on the side of the fixing portion (201) close to the second hole (112), and a third recess (114) matching the third protrusion (240) is provided on the side of the step (115) facing the first hole (111). The cover plate assembly of claim 2 .

6. The side wall of the first hole (111) is an inclined surface, the angle between the side wall of the first hole (111) and the plane on which the cover plate (100) is located is 30° to 45°, and the diameter of the first hole (111) is larger than the diameter of the fixing part (201); The cover plate assembly of claim 2 .

7. A chamfer (250) is provided on one end of the side of the fixing portion (201) close to the second hole portion (112). The cover plate assembly of claim 6 .

8. The depth of the first hole (111) along a direction perpendicular to the cover plate (100) is equal to or less than half the thickness of the cover plate (100). A cover plate assembly according to any one of claims 2 to 7.

9. The cover plate assembly further includes a pole (300), a terminal (400), an upper plastic part (500), a bus plate (800), and a lower plastic part (600), wherein a second through-hole (120) is provided in the cover plate (100), the pole (300) is installed through the second through-hole (120), the terminal (400) is installed at one end of the pole (300) close to the first end surface (2001), the upper plastic part (500) is installed between the terminal (400) and the cover plate (100), the bus plate (800) is installed at one end of the pole (300) close to the second end surface (2002), and the lower plastic part (600) is installed between the bus plate (800) and the cover plate (100). A cover plate assembly according to any one of claims 1 to 7.

10. A positioning hole (610) is provided in the lower plastic part (600), the positioning hole (610) faces the first through hole (110) and communicates with the first through hole (110), and a positioning protrusion (130) that matches the positioning hole (610) is provided on the side of the cover plate (100) closer to the lower plastic part (600). The cover plate assembly of claim 9 .

11. A battery, A device comprising a housing, a cell, and the cover plate assembly according to any one of claims 1 to 10, wherein the housing has an accommodating cavity therein, the cell is accommodated in the accommodating cavity, the housing has an opening at one end, the cover plate assembly closes the opening, and the opening of the first recess (210) faces the cell. A battery characterized by:

12. A battery pack, a battery box and the battery according to claim 11, wherein the battery is disposed in the battery box; A battery pack characterized by:

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