CN211629146U

CN211629146U - Internal thread type high-capacity lithium battery cover plate

Info

Publication number: CN211629146U
Application number: CN202020443390.0U
Authority: CN
Inventors: 王文林
Original assignee: Suzhou Juhong Communication Computer Technology Co ltd
Current assignee: Suzhou Juhong Communication Computer Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-10-02
Anticipated expiration: 2030-03-31

Abstract

An internal thread type high-capacity lithium battery cover plate comprises a cover plate main body provided with two electrode through holes, wherein a positive electrode body and a negative electrode body are respectively connected to the upper surface of the cover plate main body in an insulating mode, a lower insulating pad is connected to the lower surface of the cover plate main body, a pressure relief hole is further formed in the middle of the cover plate main body, the peripheral end face of the pressure relief hole is fixedly connected with the edge area of a metal explosion-proof thin plate, and the middle area and the edge area of the metal explosion-proof thin plate are in transition connection through continuous explosion dents to form a safe explosion-; the positive pole body and the negative pole body are internally provided with internal screw holes which are opened upwards to form a structure for interconnecting batteries. The utility model discloses a rational in infrastructure, the explosion-proof sheet metal of an organic whole can bear the bigger lithium cell internal pressure of adaptation, is difficult to cause the unexpected rupture when lithium cell pressure floats, and the reliability is high. Moreover, the inner screw holes can be connected more conveniently and rapidly when multiple batteries are connected in series and parallel, the detection and the replacement of a single lithium battery are easier, and the maintenance cost is reduced.

Description

Internal thread type high-capacity lithium battery cover plate

The technical field is as follows: the utility model relates to a lithium battery fitting, especially the apron of lithium cell.

Background art: with the rapid development of lithium battery technology, the capacity of lithium batteries is increasing, and the corresponding internal pressure is also increasing. The common explosion-proof mechanism of the lithium battery is characterized in that an explosion-proof film is covered and connected at a pressure relief hole of a lithium battery cover plate, and the explosion-proof mechanism can burst to relieve pressure when the internal pressure is abnormally increased. Along with the increase of the pressure relief area of the lithium battery cover plate, the area of the covered explosion-proof film is increased, when the pressure of the lithium battery floats due to the conditions of transportation, temperature change, charge and discharge and the like, the explosion-proof film is easy to accidentally break, so that the battery fails, and the explosion-proof film is difficult to meet the explosion safety requirement of the lithium battery. And moreover, the shell space of the high-capacity lithium battery needs to be fully utilized as much as possible, and the matched cover plate can be used for designing and assembling electrode assemblies such as an electrode body, a sealing washer and an insulating ring on the cover plate, so that the occupied shell space below is reduced. The sealing structure of the electrode assembly on the cover plate is realized by a welding process and a high-strength plastic part, so that the assembly process requirement is high, the production is complicated, the sealing structure can deform and break when the working condition temperature changes violently, the leakage risk exists, and the safety and reliability are not ideal enough.

The invention content is as follows: the utility model provides a to prior art not enough, the utility model provides a rational in infrastructure, safe and reliable's internal thread formula high capacity lithium cell apron.

The utility model comprises a cover plate main body provided with two electrode through holes, wherein an anode body and a cathode body are respectively connected on the cover plate main body in an insulating way, a lower insulating pad is connected below the cover plate main body, the middle part of the cover plate main body is also provided with a pressure relief hole, the peripheral end surface of the pressure relief hole is fixedly connected with the edge area of a metal explosion-proof thin plate, and the middle area and the edge area of the metal explosion-proof thin plate are in transition connection through continuous explosion dents to form a safe explosion-proof mechanism; the positive pole body and the negative pole body are internally provided with internal screw holes which are opened upwards to form a structure for interconnecting batteries.

The utility model discloses a rational in infrastructure, the explosion-proof sheet metal of an organic whole can bear the bigger lithium cell internal pressure of adaptation, does not influence intensity when the area is great yet itself, is difficult to unexpected the breaking when circumstances such as transportation, temperature variation, charge-discharge arouse that lithium cell pressure floats, and the reliability is high. The blasting dent as the transition connection can provide a stable safe burst value, and can rapidly and effectively burst and relieve pressure when the battery is in overpressure. Moreover, the inner screw holes arranged on the anode body and the cathode body can be connected more conveniently and rapidly when multiple batteries are connected in series and parallel, the detection and the replacement of a single lithium battery are easier, and the maintenance cost is reduced.

The invention is further described with reference to the following figures and examples.

Description of the drawings: fig. 1 is a schematic perspective view of the embodiment.

3 fig. 3 2 3 is 3 a 3 schematic 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3

Fig. 3 is a schematic perspective view of the metal explosion-proof thin plate.

Fig. 4 is a perspective exploded view of the embodiment.

The specific implementation mode is as follows: as shown in fig. 1 to 4, two electrode through holes 2 are formed in a cover plate main body 1, a positive electrode body 3 and a negative electrode body 4 are respectively connected to the upper surface of the cover plate main body 1 in an insulated manner, and a lower insulating pad 5 is connected to the lower surface of the cover plate main body 1. The middle part of the cover plate main body 1 is also provided with a pressure relief hole 6, the peripheral end surface of the pressure relief hole 6 is fixedly connected with the edge area of a metal explosion-proof thin plate 7, and the middle area and the edge area of the metal explosion-proof thin plate 7 are in transition connection through a continuous explosion dent 8 to form a safe explosion-proof mechanism. The positive electrode body 3 and the negative electrode body 4 are internally provided with internal screw holes 9 which are opened upwards to form a structure for interconnecting batteries.

When the internal pressure of the lithium battery reaches a threshold value, the blasting dent 8 is integrally broken, and the middle area of the metal explosion-proof thin plate 7 is blasted to release pressure. In addition, because the lithium battery pack can be formed by connecting a plurality of lithium batteries in series and in parallel, the special connecting piece can be very conveniently and quickly connected by utilizing the inner screw hole 9 of the anode body 3 or the cathode body 4.

In practice, the cover plate body 1 of the lithium battery is generally made of aluminum, and the metal explosion-proof sheet 7 may also be made of aluminum, and is more conveniently connected with the cover plate body 1 by laser welding or other methods. The middle area of the metal explosion-proof thin plate 7 can be a concave-convex curved surface to form a plastic floating structure, the plastic floating structure can buffer and reduce the pressure bearing impact of expansion and contraction during welding or pressure floating on the metal explosion-proof thin plate 7 during charging and discharging of a lithium battery, and the stability of a burst threshold value is further ensured.

In this embodiment, the electrode through hole 2 is a stepped through hole with an upper flange 10, the anode body 3 and the cathode body 4 are disposed in the respective electrode through holes 2 and are respectively provided with an insulating ring 11 and a sealing gasket 12, and the upper flange 10 of the electrode through hole 2 is turned inside and pressed against the insulating ring 11 to form a weldless electrode sealing structure. Therefore, the electrode assembly does not need any welding, the assembly process is simplified, the production efficiency is improved, the deformation and the scaling quantity of the sealing matching structure are small even if the working condition temperature changes violently, the risk of liquid leakage caused by cracking is avoided, and the safety and the reliability of the sealing structure are greatly improved.

In the embodiment, the clasping decorative ring 13 is covered on the upper part of the cover plate main body 1 and on the periphery of the upper flange 10 of the electrode through hole 2, so that a gap can be shielded, and the cover plate is attractive and dustproof. Moreover, the surface paste 14 is covered above the pressure relief hole 6, so that the dust is prevented, and the metal explosion-proof thin plate 7 can be prevented from being scratched accidentally to affect safety.

Claims

1. The utility model provides an internal thread formula high capacity lithium cell apron, is including the apron main part that is equipped with two electrode through-holes, and positive pole body and negative pole body be insulating connection respectively on the apron main part, and lower insulating pad is connected below the apron main part, still is equipped with pressure release hole, characterized in that at the middle part of apron main part: the peripheral end face of the pressure relief hole (6) is fixedly connected with the edge area of a metal explosion-proof thin plate (7), and the middle area and the edge area of the metal explosion-proof thin plate (7) are in transition connection through a continuous explosion dent (8) to form a safe explosion-proof mechanism; the positive pole body (3) and the negative pole body (4) are internally provided with inner screw holes (9) which are opened upwards, so that a battery mutual connection structure is formed.

2. The internal threaded high capacity lithium battery cover plate as claimed in claim 1, wherein: the electrode through holes (2) are step through holes with upper flanges (10), the positive electrode body (3) and the negative electrode body (4) are arranged in the respective electrode through holes (2) and are respectively provided with an insulating ring (11) and a sealing washer (12), and the upper flanges (10) of the electrode through holes (2) are turned inwards to press the insulating rings (11) to form a welding-free electrode sealing structure.

3. The internal threaded high-capacity lithium battery cover plate as claimed in claim 1 or 2, wherein: the middle area of the metal explosion-proof thin plate (7) is a concave-convex curved surface, and a plastic floating structure is formed.

4. The internal threaded high-capacity lithium battery cover plate as claimed in claim 1 or 2, wherein: a clasping decorative ring (13) is covered on the upper part of the cover plate main body (1) and the periphery of an upper flange (10) of the electrode through hole (2); a surface paste (14) is also covered above the pressure relief hole (6).

5. The internal threaded high capacity lithium battery cover plate as claimed in claim 3, wherein: a clasping decorative ring (13) is covered on the upper part of the cover plate main body (1) and the periphery of an upper flange (10) of the electrode through hole (2); a surface paste (14) is also covered above the pressure relief hole (6).