Edge covering cap

Abstract

The utility model relates to an edge covering cap which comprises a cap piece, an anti-explosion piece and a sealing ring, the anti-explosion piece is installed on the inner bottom of the sealing ring, the cap piece is connected to the anti-explosion piece in a pressing mode, and after the anti-explosion piece upwards covers the cap piece, the anti-explosion piece is turned over to form an anti-explosion piece pressing connection edge to be provided with a cap piece skirt edge in a pressing mode. The outer ring of the sealing ring is connected with the anti-explosion piece in a wrapping mode, the cap piece is folded to form a sealing ring pressing connection edge to press the anti-explosion piece pressing connection edge, a cap head structure protrudes in the middle of the cap piece, a circle of cap air holes are formed in the periphery of the cap head structure, and a pressure relief ring nick is correspondingly arranged on the anti-explosion piece below the cap head. And one side of the pressure relief ring nick, which corresponds to the position where the tab is welded on the explosion-proof sheet, is of a structure recessed into the circumference. One side, corresponding to the tab welding position, of the pressure relief ring nick is of a concave structure, so that excessive approaching or over-facing is effectively avoided, thermal deformation of the nick at the position is prevented, and normal action of the pressure relief ring nick is ensured, so that stable performance of the cap is ensured, and the use safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to a cap, in particular to a battery edge cap. Background Art

[0002] As an important part of a lithium battery, a lithium battery cap has functions of sealing electrolyte and explosion prevention. In the existing production of lithium batteries, usually, the positive and negative electrodes and the battery core are welded inside, then the electrolyte is filled, and finally the battery cap is encapsulated. However, when welding the electrodes, the heat energy of laser welding is conducted to the relief ring notch on one side corresponding to the welding position, thus affecting the notch on that side, causing the notch to undergo thermal deformation, which is not conducive to ensuring the stable performance of the cap and affects the normal and safe function of the relief ring notch. Summary of the Invention

[0003] The utility model provides an edge cap with a simple structure, which can prevent the heat energy conduction of laser welding from affecting the relief ring notch.

[0004] The technical scheme adopted by the utility model is as follows: an edge cap includes a cap piece, an explosion-proof piece and a sealing ring. The explosion-proof piece is installed on the inner bottom of the sealing ring, the cap piece is press-fitted on the explosion-proof piece. After the explosion-proof piece wraps around the cap piece upward and turns out an explosion-proof piece press-fitting edge to press-fit the skirt edge of the cap piece, the outer ring of the sealing ring wraps around the explosion-proof piece and the cap piece and then turns out a sealing ring press-fitting edge to press-fit the explosion-proof piece press-fitting edge. A raised cap head structure is provided in the middle of the cap piece, and a circle of cap air holes is arranged on the outer periphery of the cap head structure. A relief ring notch is provided on the explosion-proof piece corresponding to the position below the cap head. It is characterized in that: the side of the relief ring notch corresponding to the position of the welding tab of the explosion-proof piece is a structure recessed into the circumference.

[0005] The sealing ring is made of high-temperature polyethylene propylene.

[0006] The cap head of the cap piece is nickel-plated.

[0007] The nickel-plating thickness is 4 - 8μm.

[0008] The cap piece and the explosion-proof piece are welded at more than 4 welding points around the circumference.

[0009] A gasket is arranged under the cap piece to press-fit the explosion-proof piece, and a gasket through hole corresponding to the relief ring is arranged in the center of the gasket.

[0010] The inner bottom of the sealing ring is coated with lithium battery sealant, and the inner wall of the outer ring of the sealing ring is coated with lithium battery sealant.

[0011] The upper plane of the cap piece corresponding to the explosion-proof piece press-fitting edge is a reticulated convex rib or a reticulated concave groove.

[0012] The relief ring notch includes a circumferential section connected in a circle and a recessed section, and the recessed section corresponds to the position of the welding tab.

[0013] The recessed section is an arc section with both ends respectively connected to the circumferential sections, or a connected line segment formed by two line segments with two outer ends respectively connected to the circumferential sections and two inner ends connected to each other.

[0014] The utility model changes the notch of the pressure relief ring with a traditional circumferential structure to a recessed structure on one side corresponding to the welding position of the tab. This effectively avoids being too close or directly facing, so that the heat energy during laser welding of the tab does not affect the notch of the recessed structure, preventing thermal deformation of the notch at this place, which is beneficial to ensuring the normal function of the pressure relief ring notch, thereby ensuring the stable performance of the cap and improving the safety performance of battery use. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the utility model;

[0016] Figure 2 is Figure 1 the top view of

[0017] In the figure: cap piece 1, cap head 2, cap air hole 3, cap skirt 4, explosion-proof piece 5, explosion-proof piece crimping edge 6, pressure relief ring notch 7, circumferential section 8, connected line segment of two line segments 9, sealing ring 10, sealing ring crimping edge 11, tab 12, solder joint position 13. Detailed Embodiment

[0018] The following is further described with reference to the drawings.

[0019] Figure 1-2 As shown: A wrapped cap includes a cap piece 1, an explosion-proof piece 5 and a sealing ring 10. The explosion-proof piece 5 is installed on the inner bottom of the sealing ring 10. The cap piece 1 is crimped on the explosion-proof piece 5. After the explosion-proof piece 5 wraps the cap piece 1 upward, an explosion-proof piece crimping edge 6 is folded out. The explosion-proof piece crimping edge 6 presses the cap skirt 4 of the explosion-proof piece 5. A cap head 2 structure protrudes in the middle of the cap piece 1. A circle of cap air holes 3 is arranged on the outer periphery of the cap head 2 structure. A pressure relief ring notch 7 is provided on the explosion-proof piece 5 corresponding to the lower part of the cap head 2. The pressure relief ring notch 7 includes a circumferential section 8 connected in a circle and a recessed section on one side corresponding to the solder joint position 13 of the welded tab 12. The two outer ends of the recessed section are respectively connected to the circumferential sections, and the connected line segment 9 of two line segments with two inner ends connected to each other. The connected line segment 9 is formed by connecting two line segments at both ends.

[0020] In this embodiment, the two line segments of the connected line segment 9 are symmetrically arranged above and below the vertical symmetry center line of the solder joint position 13, which can better evenly conduct the welding heat energy and prevent thermal deformation.

[0021] On the basis of this embodiment, the sealing ring can be made of high-temperature polyethylene propylene.

[0022] On the basis of this embodiment, the cap head of the cap piece is nickel-plated, and the nickel-plating thickness is 4 - 8 μm.

[0023] On the basis of this embodiment, the cap piece and the explosion-proof piece are welded at more than 4 solder joints around the circumference.

[0024] On the basis of this embodiment, a gasket can also be provided under the cap piece to press-fit the explosion-proof piece, and a gasket through-hole corresponding to the pressure relief ring is provided at the center of the gasket.

[0025] On the basis of this embodiment, lithium battery sealant can also be coated on the inner bottom of the sealing ring and on the inner wall of the outer ring of the sealing ring.

[0026] On the basis of this embodiment, the upper plane of the cap piece corresponding to the crimping edge of the explosion-proof piece can also be a mesh convex rib or a mesh concave groove.

Claims

1. A cap with an edge, comprising a cap sheet, an explosion-proof sheet and a sealing ring, wherein the explosion-proof sheet is mounted on the inner bottom of the sealing ring, the cap sheet is crimped onto the explosion-proof sheet, the explosion-proof sheet is upwardly wrapped around the cap sheet and then folded out of the crimping edge of the explosion-proof sheet and then pressed onto the cap sheet skirt, the outer ring of the sealing ring wraps around the explosion-proof sheet, the cap sheet is folded out of the crimping edge of the sealing ring and then pressed onto the crimping edge of the explosion-proof sheet, a cap head structure is raised in the middle of the cap sheet, a circle of cap air holes is arranged on the periphery of the cap head structure, and a pressure relief ring notch is arranged corresponding to the explosion-proof sheet under the cap head, characterized in that: The side of the pressure relief ring notch corresponding to the welding ear position of the explosion-proof plate is a structure recessed within the circumference.

2. The edge-covering cap according to claim 1, characterized in that: The sealing ring is made of high temperature polyethylene propylene.

3. The edge-covering cap according to claim 1, characterized in that: The cap head of the cap piece is nickel plated.

4. The edge-covered cap according to claim 3, characterized in that: The nickel plating thickness is 4-8 μm.

5. The edge-covered cap according to claim 1, characterized in that: The cap plate and the explosion-proof plate are welded at more than four welding points around the circumference.

6. The edge-covered cap according to claim 1, characterized in that: A gasket press-fit explosion-proof plate is arranged under the cap plate, and a gasket through hole corresponding to the pressure relief ring is arranged at the center of the gasket.

7. The edge-covered cap according to claim 1, characterized in that: The inner bottom of the sealing ring is coated with lithium battery sealant, and the inner wall of the outer ring of the sealing ring is coated with lithium battery sealant.

8. The edge-covered cap according to claim 1, characterized in that: The upper plane of the cap sheet corresponding to the crimping edge of the explosion-proof sheet is a mesh-shaped convex ridge or a mesh-shaped concave pattern.

9. The edge-covered cap according to claim 1, characterized in that: The notch of the pressure relief ring includes a circumferential section and a recessed section connected to form a circle, and the recessed section corresponds to the position of the welding pole lug.

10. The edge-covered cap according to claim 9, characterized in that: The recessed segment is an arc segment whose two ends are connected to the circumference segment, or a line connecting two segments whose two outer ends are connected to the circumference segment and two inner ends are connected.

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