CN112531303B

CN112531303B - Highly efficient sealed lithium battery cover structure

Info

Publication number: CN112531303B
Application number: CN202011512322.6A
Authority: CN
Inventors: 支杰; 刘元成; 郝世洪; 张纯辉
Original assignee: Changzhou Wujin Zhongrui Electronic Technology Co ltd
Current assignee: Changzhou Wujin Zhongrui Electronic Technology Co ltd
Priority date: 2020-12-19
Filing date: 2020-12-19
Publication date: 2025-03-18
Anticipated expiration: 2040-12-19
Also published as: CN112531303A

Abstract

The invention relates to the technical field of lithium batteries, in particular to an efficient sealed upper cover plate structure of a lithium battery, which comprises a cover plate, a pole column, a ceramic sealing ring, a switching piece, an upper isolation ring and a lower isolation ring, wherein a central hole for the pole column to pass through is penetrated through the cover plate, the ceramic sealing ring is sealed between the central hole and the pole column, the inner peripheral surface of the ceramic sealing ring is attached to the outer peripheral surface of the pole column, and the outer peripheral surface of the ceramic sealing ring is attached to the inner peripheral surface of the central hole.

Description

High-efficient sealed lithium cell upper cover plate structure

Technical Field

The invention relates to the technical field of lithium batteries, in particular to an efficient sealing upper cover plate structure of a lithium battery.

Background

The lithium battery is a chemical battery with high energy ratio and strong high-low temperature adaptability, basically has two major categories of lithium metal batteries and lithium ions, and is mainly characterized by large energy density, high working voltage, low self-discharge rate and no memory effect, is widely applied to the fields of notebooks, electric tools, electric automobiles and the like, and provides stable and safe power output for the lithium battery;

At present, the inside electrolyte and electrolyte seal structure that have of casing of lithium cell, the both ends of casing adopt upper cover plate and lower apron to seal respectively, in order to prevent when electrolyte seal structure became invalid, the inside electrolyte that leaks of lithium cell was flowed to the external world from upper cover plate, lead to the fact the corruption to peripheral lithium cell, can adopt the sealing washer to seal in order to realize the electrolyte shutoff that will leak inside the lithium cell between upper cover plate and the utmost point post in prior art, however when the inside electrolyte that leaks of lithium cell, the internal pressure is great, the sealing washer hardly carries out effectual shutoff to the electrolyte that leaks, still can appear the electrolyte and leak to external condition.

Disclosure of Invention

The invention aims to solve the technical problem that in the prior art, a sealing structure between an upper cover plate and a pole of a lithium battery is difficult to form effective sealing on electrolyte leaked from the inside of the lithium battery, and provides an efficient sealing upper cover plate structure of the lithium battery.

The technical scheme includes that the high-efficiency sealed upper cover plate structure of the lithium battery comprises a cover plate, a pole column, a ceramic sealing ring, a switching piece, an upper isolation ring and a lower isolation ring, wherein a central hole for the pole column to pass through is formed in the cover plate in a penetrating manner, the pole column is inserted into the central hole, the ceramic sealing ring is sealed between the central hole and the pole column, the inner peripheral surface of the ceramic sealing ring is attached to the outer peripheral surface of the pole column, and the outer peripheral surface of the ceramic sealing ring is attached to the inner peripheral surface of the central hole;

The upper end of the switching piece is outwards bent to form an upper connecting wing, the lower end of the switching piece is inwards bent to form a lower connecting wing, the upper isolation ring is arranged on the lower surface of the cover plate, the upper connecting wing is positioned between the upper isolation ring and the cover plate, the bottom end of the outer peripheral surface of the pole is fixedly provided with a connecting sheet, the lower isolation ring is positioned above the connecting sheet, the lower connecting wing is positioned between the lower isolation ring and the ceramic sealing ring, and a buffer groove is formed between the switching piece and the ceramic sealing ring.

Utilize among this scheme to form the buffer tank between change piece and ceramic seal ring for store the inside electrolyte of leaking of lithium cell and the gaseous of production, play the pressure release function, with this sealed requirement that reduces ceramic seal ring, ceramic seal ring's intensity is high simultaneously, and bearing capacity is strong, and life is high, difficult emergence is out of shape, thereby realizes can stable formation seal, prevents that the inside electrolyte of leaking of lithium cell from flowing to the external world, and the lower link wing of connection piece can encircle ceramic seal tightly, reinforcing structure's stability.

Further, the upper end of the outer peripheral surface of the pole is outwards extended to form an annular bulge, the top end surface of the ceramic sealing ring is provided with a sealing grouting layer, the outer peripheral surface of the sealing grouting layer is connected with the inner peripheral surface of the central hole, the inner peripheral surface of the sealing grouting layer is connected with the outer peripheral surface of the annular bulge, the sealing grouting layer is used for forming a plug on the upper end surface of the ceramic sealing ring, the sealing effect can be effectively improved, meanwhile, the requirement on the sealing grouting layer is reduced due to the existence of a buffer groove, and the production is facilitated.

Further, the upper end of the ceramic sealing ring is welded and fixed with the annular bulge.

Further, the lower end of the ceramic sealing ring and the lower connecting wing are welded and fixed.

Further, the connecting piece is fixed on the pole by welding.

Further, a communication hole communicated with the buffer groove is formed in the outer peripheral surface of the switching piece.

Further, a protruding portion extends upward from the inner side of the upper surface of the lower spacer ring, and is located between the inner peripheral surface of the lower connection wing and the outer peripheral surface of the pole.

Further, the cover plate is an aluminum cover plate.

The high-efficiency sealed lithium battery upper cover plate structure has the beneficial effects that the buffer groove is formed between the switching piece and the ceramic sealing ring and is used for storing electrolyte leaked from the interior of the lithium battery and generated gas, so that the pressure relief function is realized, the sealing requirement of the ceramic sealing ring is reduced, meanwhile, the ceramic sealing ring is high in strength, strong in pressure bearing capacity and long in service life, and is not easy to deform, so that the sealing can be stably formed, the electrolyte leaked from the interior of the lithium battery is prevented from flowing to the outside, the ceramic sealing ring can be held tightly by the lower connecting wings of the connecting piece, and the stability of the structure is enhanced.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a schematic illustration of the structure of an upper cover plate of a high efficiency sealed lithium battery of the present invention;

Fig. 2 is a schematic view of the structure of the upper cover plate of the lithium battery with high efficiency and sealing, which is installed at the upper end of the shell.

In the figure, 1, a cover plate, 101, a central hole, 2, a pole column, 201, an annular bulge, 3, a ceramic sealing ring, 4, a switching piece, 401, an upper connecting wing, 402, a lower connecting wing, 5, an upper isolation ring, 6, a lower isolation ring, 601, a bulge, 7, a connecting piece, 8, a sealing glue filling layer, 9, a buffer tank, 10 and a shell.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only those features which are relevant to the invention, and orientation and reference (e.g., up, down, left, right, etc.) may be used solely to aid in the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

Example 1

As shown in fig. 1-2, an upper cover plate structure of a lithium battery with high efficiency sealing comprises a cover plate 1, a pole column 2, a ceramic sealing ring 3, a switching piece 4, an upper isolation ring 5 and a lower isolation ring 6, wherein a central hole 101 for the pole column 2 to pass through is penetrated through the cover plate 1, the pole column 2 is inserted into the central hole 101, the ceramic sealing ring 3 is sealed between the central hole 101 and the pole column 2, the inner peripheral surface of the ceramic sealing ring 3 is attached to the outer peripheral surface of the pole column 2, and the outer peripheral surface of the ceramic sealing ring 3 is attached to the inner peripheral surface of the central hole 101;

The upper end of the adapter piece 4 is outwards bent to form an upper connecting wing 401, the lower end of the adapter piece 4 is inwards bent to form a lower connecting wing 402, the upper isolating ring 5 is arranged on the lower surface of the cover plate 1, the upper connecting wing 401 is positioned between the upper isolating ring 5 and the cover plate 1, the bottom end of the outer peripheral surface of the pole 2 is fixedly provided with a connecting sheet 7, the lower isolating ring 6 is positioned above the connecting sheet 7, the lower connecting wing 402 is positioned between the lower isolating ring 6 and the ceramic sealing ring 3, and a buffer groove 9 is formed between the adapter piece 4 and the ceramic sealing ring 3.

In this embodiment, the upper spacer ring 5 may be fixed on the lower surface of the cover plate 1, or the upper spacer ring 5 is in interference fit with the adapter plate 4.

The upper end of the outer peripheral surface of the pole 2 is outwards extended to form an annular bulge 201, the top end surface of the ceramic sealing ring 3 is provided with a sealing grouting layer 8, the outer peripheral surface of the sealing grouting layer 8 is connected with the inner peripheral surface of the central hole 101, the inner peripheral surface of the sealing grouting layer 8 is connected with the outer peripheral surface of the annular bulge 201, and the sealing grouting layer 8 is used for forming a seal on the upper end surface of the ceramic sealing ring 3, so that the sealing effect can be effectively improved, meanwhile, the requirement on the sealing grouting layer 8 is reduced due to the existence of a buffer groove 9, and the production is facilitated.

The upper end of the ceramic sealing ring 3 is welded and fixed with the annular bulge 201.

The lower end of the ceramic seal ring 3 and the lower connecting wing 402 are welded and fixed.

The connecting piece 7 is welded and fixed on the pole 2.

The outer peripheral surface of the adapter piece 4 is provided with a communication hole communicated with the buffer tank 9 so that electrolyte leaked from the interior of the lithium battery enters the buffer tank 9 from the communication hole.

A protruding portion 601 extends upward from the inner side of the upper surface of the lower spacer 6, and the protruding portion 601 is located between the inner peripheral surface of the lower connection wing 402 and the outer peripheral surface of the pole 2.

The cover plate 1 is an aluminum cover plate.

In this embodiment, the electrode post 2 is an aluminum-copper composite electrode post, the upper layer of the electrode post 2 is an aluminum layer, and the lower layer of the electrode post 2 is a copper layer, so that the conductivity of the electrode post 2 can be improved.

The upper end at lithium cell casing 10 is installed to high-efficient sealed lithium cell upper cover plate structure in this embodiment, when the inside electrolyte seal structure of lithium cell became invalid, the inside pressure of lithium cell can be followed to the electric liquid that leaks and enter into buffer tank 9 to release the lithium cell, thereby reduce the sealed requirement of ceramic seal ring 3, the intensity of ceramic seal ring 3 is high simultaneously, bearing capacity is strong, life is high, be difficult for taking place to warp, and then the realization can be stable form sealed, prevent that the inside electrolyte that leaks of lithium cell from flowing to the external world, and the lower link wing 402 of connection piece 7 can hold ceramic seal ring 3 tightly, the stability of reinforcing structure.

The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims

1. The high-efficiency sealed lithium battery upper cover plate structure is characterized by comprising a cover plate (1), a pole column (2), a ceramic sealing ring (3), a switching piece (4), an upper isolation ring (5) and a lower isolation ring (6), wherein a central hole (101) for the pole column (2) to pass through is penetrated through the cover plate (1), the pole column (2) is inserted into the central hole (101), the ceramic sealing ring (3) is sealed between the central hole (101) and the pole column (2), the inner peripheral surface of the ceramic sealing ring (3) is attached to the outer peripheral surface of the pole column (2), and the outer peripheral surface of the ceramic sealing ring (3) is attached to the inner peripheral surface of the central hole (101);

The upper end of the switching piece (4) is outwards bent to form an upper connecting wing (401), the lower end of the switching piece (4) is inwards bent to form a lower connecting wing (402), the upper isolation ring (5) is arranged on the lower surface of the cover plate (1), the upper connecting wing (401) is positioned between the upper isolation ring (5) and the cover plate (1), the bottom end of the outer peripheral surface of the pole (2) is fixedly provided with a connecting piece (7), the lower isolation ring (6) is positioned above the connecting piece (7), the lower connecting wing (402) is positioned between the lower isolation ring (6) and the ceramic sealing ring (3), and a buffer groove (9) is formed between the switching piece (4) and the ceramic sealing ring (3);

The upper end of the outer peripheral surface of the pole (2) is outwards extended with an annular bulge (201), the top end surface of the ceramic sealing ring (3) is provided with a sealing grouting layer (8), the outer peripheral surface of the sealing grouting layer (8) is connected with the inner peripheral surface of the central hole (101), and the inner peripheral surface of the sealing grouting layer (8) is connected with the outer peripheral surface of the annular bulge (201);

The outer peripheral surface of the adapter piece (4) is provided with a communication hole communicated with the buffer groove (9).

2. The high-efficiency sealed upper cover plate structure of the lithium battery, as claimed in claim 1, is characterized in that the upper end of the ceramic sealing ring (3) is welded and fixed with the annular bulge (201).

3. The high-efficiency sealed upper cover plate structure of the lithium battery, as claimed in claim 1, is characterized in that the lower end of the ceramic sealing ring (3) and the lower connecting wing (402) are welded and fixed.

4. The high-efficiency sealed upper cover plate structure of the lithium battery, as claimed in claim 1, is characterized in that the connecting sheet (7) is welded and fixed on the pole (2).

5. The high-efficiency sealed upper cover plate structure of a lithium battery according to claim 1, wherein the inner side of the upper surface of the lower isolation ring (6) is provided with a protruding part (601) in an upward extending mode, and the protruding part (601) is located between the inner peripheral surface of the lower connecting wing (402) and the outer peripheral surface of the pole (2).

6. The high-efficiency sealed upper cover plate structure of the lithium battery as claimed in claim 1, wherein the cover plate (1) is an aluminum cover plate.