CN218182333U

CN218182333U - Novel lithium battery cover of cascaded outage

Info

Publication number: CN218182333U
Application number: CN202220307436.5U
Authority: CN
Inventors: 潘青海
Original assignee: Doxter Tianjin New Energy Technology Co ltd
Current assignee: Doxter Tianjin New Energy Technology Co ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-12-30
Anticipated expiration: 2032-02-15

Abstract

The utility model relates to the technical field of batteries, in particular to a novel stepped power-off lithium battery cover, which comprises a cover main body and a sealing ring, wherein the cover main body comprises a top cover, an explosion-proof diaphragm and a power-off diaphragm; the battery cover main body can comprise a top cover or not; the battery cover body can be round, square or other shapes; the power-off membrane can be a single piece or an assembly; the explosion-proof membrane and the power-off membrane are welded together through welding spots. The utility model discloses guaranteeing the condition of outage pressure, increasing welding area to increase heavy current conducting capacity, reduce the battery cover internal resistance and reduce the heat that the heavy current produced when passing through, make only need lower tension between outage diaphragm and explosion-proof diaphragm, alright with the whole disconnection of solder joint.

Description

Novel lithium battery cover of cascaded outage

Technical Field

The utility model relates to the technical field of batteries, specifically a novel lithium battery cover of cascaded outage.

Background

The lithium ion battery has the advantages of high specific energy, long cycle times and the like, is applied to various fields including portable electronic equipment, electric automobiles, electric bicycles, electric tools, energy storage and the like, has higher and higher requirements on the battery along with the rapid increase of the demand of the current market on the battery, and particularly has the advantages of rapid charging and rapid discharging (namely, large-current charging and discharging of the battery) and safety guarantee on the battery.

In the production technology of the cylindrical lithium ion battery, the battery cover is a very important component, which not only ensures the requirement of the battery on high current conduction during normal operation, but also has the function of timely powering off and releasing internal pressure of the battery under abnormal conditions.

The overall structure of the battery cover generally consists of three parts: a CID (current interrupt device) for opening in an abnormal condition to disconnect the battery cover from a current loop inside the battery; vent, which releases the internal pressure of the battery due to opening in abnormal situations; and the Cap is used for being matched with the air escape valve and releasing the internal pressure of the battery through an air escape hole on the Cap. Some cell covers have only CID and Vent, and no Cap.

The CID and Vent principles are as follows: when the internal temperature of the battery cell is abnormal, a large amount of gas is generated due to overcharge, short circuit and the like, and the air pressure is continuously increased, the explosion-proof membrane is turned over, welding points between the explosion-proof membrane and the power-off membrane are disconnected, so that a circuit in the battery is immediately disconnected, and an aluminum sheet of the corresponding explosion-proof membrane is upwards bounced to be separated from the power-off membrane; if the pressure continues to rise, the safety valve on the safety diaphragm tears and breaks, and the gas in the battery is released, so that the internal pressure is released, and explosion caused by overhigh pressure is avoided, namely, internal pressure rise → Vent overturn → CID welding point snapping → pressure continues rising → Vent breaking.

The pressure design of the battery cover mainly controls two points, namely Vent overturning pressure and CID welding spot tension, wherein CID breaking pressure = equivalent pressure of Vent overturning pressure + CID welding spot tension, and equivalent pressure (Mpa) of CID welding spot tension is not less than CID welding spot tension (N)/78.5; therefore, the CID welding spot is an important process, and the welding spot on the power-off membrane is required to be opened under abnormal conditions (the power-off pressure of a conventional battery is required to be 1.0-1.6 Mpa), so that a current loop between the battery cover and the interior of the battery is disconnected, and overcurrent of the battery in normal charging and discharging work is also required to be ensured. In the traditional design and production process of the battery cover, in order to ensure that the battery can be disconnected under the pressure environment of 1.0-1.6Mpa, welding points are designed to be generally between 2-6 points, so that the high current passing performance is limited, and if the battery is made, when the high current passes through the welding points, the battery can generate a large amount of heat due to the action of internal resistance, and the safety and the service life of the battery can be influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel lithium battery cover of cascaded outage to after the solder joint area increases between outage diaphragm and explosion-proof diaphragm, the problem that CID's disconnection can hardly be realized is put forward in solving above-mentioned background art.

The technical scheme of the utility model is that: a novel stepped power-off lithium battery cover comprises a battery cover main body and a sealing ring, wherein the battery cover main body comprises a top cover, an explosion-proof membrane and a power-off membrane;

the battery cover main body may or may not include a top cover;

the battery cover body can be round, square or other shapes;

the power-off membrane is one of a single piece or an assembly;

the explosion-proof membrane and the power-off membrane are welded together through welding points which are arranged in a stepped mode;

the sealing ring comprises an outer ring and an inner ring, compression resistant columns distributed in an annular structure at equal intervals are welded between the outer ring and the inner ring, and explosion-proof nets distributed in an annular structure at equal intervals are welded between the compression resistant columns.

Furthermore, the power-off membrane assembly specifically comprises a current collecting disc support and a current collecting disc, wherein the current collecting disc is arranged inside the current collecting disc support, and the current collecting disc is connected with the explosion-proof membrane through welding points.

The utility model discloses an improve and provide a novel lithium battery cover of cascaded outage here, compare with prior art, have following improvement and advantage:

(1) The utility model discloses the battery cover is under certain condition, and the battery is inside can produce certain pressure to convert into explosion-proof diaphragm and outage diaphragm tension within a definite time, this tension can be with explosion-proof diaphragm and outage diaphragm connection solder joint disconnection.

(2) The utility model discloses a fine promotion the intensity of sealing washer of the compressive column and the explosion-proof net that set up, the explosion-proof performance of sealing washer has been promoted to the explosion-proof net simultaneously to the life of sealing washer has been prolonged.

Drawings

The invention is further explained below with reference to the figures and examples:

fig. 1 is a schematic view of a battery cover without a top cover according to the present invention;

fig. 2 is a schematic structural view of the battery cover with the top cover according to the present invention;

fig. 3 is a schematic structural diagram of the sealing ring of the present invention.

Description of the reference numerals:

1. a battery cover main body; 2. a seal ring; 3. an explosion-proof membrane; 4. a power-off membrane; 5. a top cover; 401. a collector tray support; 402. a current collecting plate; 201. an outer ring; 202. an inner ring; 203. An explosion-proof net; 204. and (4) a compression resistant column.

Detailed Description

The present invention will be described in detail with reference to fig. 1 to 3, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for purposes of illustration only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a novel step-type power-off lithium battery cover, as shown in fig. 1-3, comprising a battery cover main body 1 and a sealing ring 2, wherein the battery cover main body 1 comprises a top cover 5, an explosion-proof membrane 3 and a power-off membrane 4;

the battery cover body 1 may or may not include the top cover 5;

the cell cover body 1 may be circular, square or other shape;

the power-off membrane 4 is one of a single piece or an assembly;

the explosion-proof membrane 3 and the power-off membrane 4 are welded together through welding points which are arranged in a stepped mode;

the sealing ring 2 comprises an outer ring 201 and an inner ring 202, compression resistant columns 204 distributed in an annular structure at equal intervals are welded between the outer ring 201 and the inner ring 202, and explosion-proof nets 203 distributed in an annular structure at equal intervals are welded between the compression resistant columns 204.

Further, the power-off membrane 4 assembly specifically comprises a current-collecting disk bracket 401 and a current-collecting disk 402, wherein the current-collecting disk 402 is arranged inside the current-collecting disk bracket 401, and the current-collecting disk 402 is connected with the explosion-proof membrane 3 through welding points.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a novel lithium battery cover of cascaded outage, includes battery cover main part (1) and sealing washer (2), its characterized in that, battery cover main part (1) includes top cap (5), explosion-proof diaphragm (3) and outage diaphragm (4).

2. The novel stepped power-off lithium battery cover according to claim 1, characterized in that: the battery cover body (1) may be circular, square or other shape.

3. The novel stepped power-off lithium battery cover according to claim 1, characterized in that: the deenergizing diaphragm (4) is one of a single piece or an assembly.

4. The novel stepped power-off lithium battery cover according to claim 1, characterized in that: the explosion-proof membrane (3) and the power-off membrane (4) are welded together through welding spots arranged in a stepped manner.

5. The novel stepped power-off lithium battery cover according to claim 1, characterized in that: the sealing ring (2) comprises an outer ring (201) and an inner ring (202), wherein anti-pressure columns (204) distributed in an annular structure at equal intervals are welded between the outer ring (201) and the inner ring (202), and anti-explosion nets (203) distributed in an annular structure at equal intervals are welded between the anti-pressure columns (204).

6. The novel stepped power-off lithium battery cover according to claim 1, characterized in that: the power-off membrane (4) assembly specifically comprises a current collecting disc support (401) and a current collecting disc (402), wherein the current collecting disc (402) is arranged inside the current collecting disc support (401), and the current collecting disc (402) is connected with the explosion-proof membrane (3) through welding spots.