Highly efficient sealed lithium battery cover structure

Abstract

The present invention relates to the technical field of lithium batteries, and in particular to an efficient sealed upper cover plate structure of a lithium battery, comprising a cover plate, a pole, a ceramic sealing ring, an adapter plate, an upper isolating ring and a lower isolating ring. The cover plate is penetrated with a central hole for the pole to pass through, the ceramic sealing ring is sealed between the central hole and the pole, the inner circumference of the ceramic sealing ring is in contact with the outer circumference of the pole, and the outer circumference of the ceramic sealing ring is in contact with the inner circumference of the central hole. The present invention utilizes a buffer groove formed between the adapter plate and the ceramic sealing ring to store electrolyte leaked from the lithium battery and generated gas, thereby playing a pressure relief function, thereby reducing the sealing requirements of the ceramic sealing ring. At the same time, the ceramic sealing ring has high strength, strong pressure bearing capacity, high service life, and is not easy to deform, thereby achieving stable sealing, preventing the electrolyte leaked from the lithium battery from flowing to the outside, and the lower connecting wing of the connecting plate can hold the ceramic sealing ring tightly, thereby enhancing the stability of the structure.

Description

Technical Field

[0001] The invention relates to the technical field of lithium batteries, and in particular to a highly efficient sealed upper cover plate structure of a lithium battery. Background Art

[0002] Lithium battery is a chemical battery with relatively high energy and strong adaptability to high and low temperatures. It is basically divided into two categories: lithium metal battery and lithium ion battery. Its main features are high energy density, high operating voltage, low self-discharge rate, and no memory effect. It is widely used in notebooks, power tools, electric vehicles and other fields to provide stable and safe power output.

[0003] At present, the shell of a lithium battery has an electrolyte and an electrolyte sealing structure, and the two ends of the shell are sealed with an upper cover and a lower cover respectively. In order to prevent the electrolyte leaking from the lithium battery from flowing from the upper cover to the outside when the electrolyte sealing structure fails, causing corrosion to the surrounding lithium batteries, a sealing ring is usually used to seal between the upper cover and the pole in the prior art to seal the leaked electrolyte inside the lithium battery. However, when the electrolyte leaks from the lithium battery, the internal pressure is relatively large, and it is difficult for the sealing ring to effectively seal the leaked electrolyte, and the electrolyte will still leak to the outside. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that the sealing structure between the upper cover plate and the pole of the lithium battery in the prior art is difficult to effectively seal the electrolyte leaked from the lithium battery, a highly efficient sealed upper cover plate structure of the lithium battery is now provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an efficient sealed upper cover plate structure of a lithium battery, comprising a cover plate, a pole, a ceramic sealing ring, a switching plate, an upper isolating ring and a lower isolating ring, the cover plate is penetrated by a central hole for the pole to pass through, the pole is inserted in the central hole, the ceramic sealing ring is sealed between the central hole and the pole, the inner circumference of the ceramic sealing ring is in contact with the outer circumference of the pole, and the outer circumference of the ceramic sealing ring is in contact with the inner circumference of the central hole;

[0006] The upper end of the adapter plate is bent outward to form an upper connecting wing, and the lower end of the adapter plate is bent inward to form a lower connecting wing. The upper isolation ring is arranged on the lower surface of the cover plate, and the upper connecting wing is located between the upper isolation ring and the cover plate. A connecting plate is fixed to the bottom end of the outer peripheral surface of the pole, and the lower isolation ring is located above the connecting plate. The lower connecting wing is located between the lower isolation ring and the ceramic sealing ring, and a cache groove is formed between the adapter plate and the ceramic sealing ring.

[0007] In this solution, a buffer groove is formed between the adapter plate and the ceramic sealing ring to store the electrolyte leaked from the lithium battery and the generated gas, thereby playing a pressure relief function, thereby reducing the sealing requirements of the ceramic sealing ring. At the same time, the ceramic sealing ring has high strength, strong pressure bearing capacity, long service life, and is not easy to deform, thereby achieving a stable seal and preventing the electrolyte leaked from the lithium battery from flowing to the outside. The lower connecting wing of the connecting plate can hold the ceramic sealing ring tightly to enhance the stability of the structure.

[0008] Furthermore, an annular protrusion extends outward from the upper end of the outer circumference of the pole, and a sealing glue layer is provided on the top end face of the ceramic sealing ring. The outer circumference of the sealing glue layer is connected to the inner circumference of the center hole, and the inner circumference of the sealing glue layer is connected to the outer circumference of the annular protrusion. The sealing glue layer is used to form a seal on the upper end face of the ceramic sealing ring, which can effectively improve the sealing effect. At the same time, the presence of the cache groove also reduces the requirements for the sealing glue layer, which facilitates production.

[0009] Furthermore, the upper end of the ceramic sealing ring is fixed to the annular protrusion by welding.

[0010] Furthermore, the lower end of the ceramic sealing ring and the lower connecting wing are fixed by welding.

[0011] Furthermore, the connecting piece is fixed on the pole by welding.

[0012] Furthermore, a connecting hole connected to the cache slot is provided on the outer peripheral surface of the adapter plate.

[0013] Furthermore, a protrusion extends upward from the inner side of the upper surface of the lower isolation ring, and the protrusion is located between the inner circumferential surface of the lower connecting wing and the outer circumferential surface of the pole.

[0014] Furthermore, the cover plate is an aluminum cover plate.

[0015] The beneficial effects of the present invention are as follows: the highly efficient sealed lithium battery upper cover plate structure of the present invention utilizes a buffer groove formed between the adapter plate and the ceramic sealing ring to store the electrolyte leaked from the lithium battery and the generated gas, thereby playing a pressure relief function, thereby reducing the sealing requirements of the ceramic sealing ring. At the same time, the ceramic sealing ring has high strength, strong pressure bearing capacity, long service life, and is not easy to deform, thereby achieving a stable seal and preventing the electrolyte leaked from the lithium battery from flowing to the outside, and the lower connecting wing of the connecting plate can hold the ceramic sealing ring tightly to enhance the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the highly efficient sealed lithium battery upper cover structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the highly efficient sealed lithium battery upper cover structure of the present invention being installed on the upper end of the shell.

[0019] In the figure: 1, cover plate, 101, center hole, 2, pole, 201, annular protrusion, 3, ceramic sealing ring, 4, adapter, 401, upper connecting wing, 402, lower connecting wing, 5, upper isolation ring, 6, lower isolation ring, 601, protrusion, 7, connecting piece, 8, sealing glue layer, 9, cache slot, 10, shell. DETAILED DESCRIPTION

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0021] Example 1

[0022] like Figure 1-2 As shown, an efficient sealed upper cover plate structure of a lithium battery comprises a cover plate 1, a pole 2, a ceramic sealing ring 3, an adapter plate 4, an upper isolating ring 5 and a lower isolating ring 6. The cover plate 1 is penetrated with a central hole 101 for the pole 2 to pass through, the pole 2 is inserted in the central hole 101, the ceramic sealing ring 3 is sealed between the central hole 101 and the pole 2, the inner circumference of the ceramic sealing ring 3 is in contact with the outer circumference of the pole 2, and the outer circumference of the ceramic sealing ring 3 is in contact with the inner circumference of the central hole 101;

[0023] The upper end of the adapter plate 4 is bent outward to form an upper connecting wing 401, and the lower end of the adapter plate 4 is bent inward to form a lower connecting wing 402. The upper isolation ring 5 is arranged on the lower surface of the cover plate 1, and the upper connecting wing 401 is located between the upper isolation ring 5 and the cover plate 1. A connecting plate 7 is fixed to the bottom end of the outer peripheral surface of the pole 2, and the lower isolation ring 6 is located above the connecting plate 7. The lower connecting wing 402 is located between the lower isolation ring 6 and the ceramic sealing ring 3. A cache groove 9 is formed between the adapter plate 4 and the ceramic sealing ring 3.

[0024] In this embodiment, the upper isolating ring 5 can be fixed on the lower surface of the cover plate 1 , or the upper isolating ring 5 and the adapter plate 4 can be interference fit.

[0025] An annular protrusion 201 extends outward from the upper end of the outer circumference of the pole 2, and a sealing glue layer 8 is provided on the top end face of the ceramic sealing ring 3. The outer circumference of the sealing glue layer 8 is connected to the inner circumference of the center hole 101, and the inner circumference of the sealing glue layer 8 is connected to the outer circumference of the annular protrusion 201. The sealing glue layer 8 is used to form a seal on the upper end face of the ceramic sealing ring 3, which can effectively improve the sealing effect. At the same time, the presence of the buffer groove 9 also reduces the requirements for the sealing glue layer 8, which is convenient for production.

[0026] The upper end of the ceramic sealing ring 3 is fixed to the annular protrusion 201 by welding.

[0027] The lower end of the ceramic sealing ring 3 is fixed to the lower connecting wing 402 by welding.

[0028] The connecting piece 7 is fixed on the pole 2 by welding.

[0029] A connecting hole connected to the buffer slot 9 is provided on the outer peripheral surface of the adapter plate 4 so that the electrolyte leaked from the lithium battery can enter the buffer slot 9 through the connecting hole.

[0030] A protrusion 601 extends upward from the inner side of the upper surface of the lower isolation ring 6 , and the protrusion 601 is located between the inner circumference of the lower connecting wing 402 and the outer circumference of the pole 2 .

[0031] The cover plate 1 is an aluminum cover plate.

[0032] In this embodiment, the pole 2 is an aluminum-copper composite pole, the upper layer of the pole 2 is an aluminum layer, and the lower layer of the pole 2 is a copper layer; the conductivity of the pole 2 can be improved.

[0033] In this embodiment, the highly efficient sealed lithium battery upper cover plate structure is installed at the upper end of the lithium battery housing 10. When the electrolyte sealing structure inside the lithium battery fails, the leaked electrolyte will enter the buffer slot 9 from the connecting hole to release the pressure inside the lithium battery, thereby reducing the sealing requirements of the ceramic sealing ring 3. At the same time, the ceramic sealing ring 3 has high strength, strong pressure bearing capacity, long service life, and is not easy to deform, thereby achieving a stable seal to prevent the electrolyte leaked from the lithium battery from flowing to the outside, and the lower connecting wing 402 of the connecting sheet 7 can hold the ceramic sealing ring 3 tightly to enhance the stability of the structure.

[0034] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An efficient sealed lithium battery upper cover structure, characterized in that: The invention comprises a cover plate (1), a pole (2), a ceramic sealing ring (3), an adapter plate (4), an upper isolating ring (5) and a lower isolating ring (6); the cover plate (1) is penetrated by a central hole (101) for the pole (2) to pass through; the pole (2) is inserted into the central hole (101); the ceramic sealing ring (3) is sealed between the central hole (101) and the pole (2); the inner circumference of the ceramic sealing ring (3) is in contact with the outer circumference of the pole (2); and the outer circumference of the ceramic sealing ring (3) is in contact with the inner circumference of the central hole (101); The upper end of the adapter plate (4) is bent outward to form an upper connecting wing (401), and the lower end of the adapter plate (4) is bent inward to form a lower connecting wing (402); the upper isolating ring (5) is arranged on the lower surface of the cover plate (1), and the upper connecting wing (401) is located between the upper isolating ring (5) and the cover plate (1); a connecting plate (7) is fixed to the bottom end of the outer peripheral surface of the pole (2); the lower isolating ring (6) is located above the connecting plate (7), and the lower connecting wing (402) is located between the lower isolating ring (6) and the ceramic sealing ring (3); a buffer groove (9) is formed between the adapter plate (4) and the ceramic sealing ring (3); An annular protrusion (201) extends outward from the upper end of the outer circumference of the pole (2), a sealing glue layer (8) is provided on the top end face of the ceramic sealing ring (3), the outer circumference of the sealing glue layer (8) is connected to the inner circumference of the center hole (101), and the inner circumference of the sealing glue layer (8) is connected to the outer circumference of the annular protrusion (201); A communication hole communicating with the buffer slot (9) is provided on the outer peripheral surface of the adapter plate (4).

2. The highly efficient sealed lithium battery upper cover structure according to claim 1, characterized in that: The upper end of the ceramic sealing ring (3) is fixedly welded to the annular protrusion (201).

3. The highly efficient sealed lithium battery upper cover structure according to claim 1, characterized in that: The lower end of the ceramic sealing ring (3) and the lower connecting wing (402) are fixed by welding.

4. The highly efficient sealed lithium battery upper cover structure according to claim 1, characterized in that: The connecting piece (7) is welded and fixed on the pole (2).

5. The highly efficient sealed lithium battery upper cover structure according to claim 1, characterized in that: A protrusion (601) extends upward from the inner side of the upper surface of the lower isolation ring (6), and the protrusion (601) is located between the inner circumference of the lower connecting wing (402) and the outer circumference of the pole (2).

6. The highly efficient sealed lithium battery upper cover structure according to claim 1, characterized in that: The cover plate (1) is an aluminum cover plate.

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