CN214477679U

CN214477679U - Lithium battery cap

Info

Publication number: CN214477679U
Application number: CN202120877910.3U
Authority: CN
Inventors: 戴永记; 崔恒强
Original assignee: Xinxiang Xuxing Power Supply Technology Co ltd
Current assignee: Xinxiang Xuxing Power Supply Technology Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-10-22
Anticipated expiration: 2031-04-26

Abstract

The utility model discloses a lithium battery cap, including insulating crust, from last top cap, explosion-proof piece, insulating circle and the orifice plate of having set gradually extremely down in the insulating crust, be provided with the ascending first bellying of direction on the top cap, top cap lock joint is on explosion-proof piece, explosion-proof piece is provided with the decurrent second bellying of direction, the inside bending type of edge part of explosion-proof piece will the edge part joint of top cap, be provided with the shell fragment between first bellying, the second bellying, just shell fragment one end welding is at first bellying, and the other end is buckled downwards and is fixed on the second bellying, insulating circle sets up on the second bellying, the orifice plate is glued on explosion-proof piece and including the insulating circle parcel, the central point of second bellying put with the central point of orifice plate puts welded fastening. The equipment loss caused by short-circuit faults is reduced, and the use cost is saved.

Description

Lithium battery cap

Technical Field

The utility model relates to a battery preparation technical field especially relates to a lithium cell block.

Background

The lithium battery cap is an important component of a lithium battery, plays a role of a positive conductive terminal on the lithium battery, plays a role of a safety valve, and can also have a sealing function on the lithium battery. However, in the long-time use process, the short circuit is generated in the equipment, so that the short circuit is formed inside the lithium battery, namely, the short circuit of the positive electrode and the negative electrode of the lithium battery breaks down, high-voltage current or high temperature is generated, and large impact can be generated on a lithium battery cap. The block of some current lithium cells when receiving the electric current and strikeing, because of the inside long-time tension that keeps of lithium cell causes the resilience force of part not enough, can not break away from the voltage and the block top of lithium cell inside completely, positive negative pole short circuit causes the inside high temperature of lithium cell, if can not form and open circuit, the lithium cell has the risk of leaking even explosion, and the serious person can cause unrepairable harm to the equipment that uses the lithium cell.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome can not in time form the not enough of opening circuit when the short circuit among the prior art, provide a lithium cell block.

The utility model discloses a realize through following technical scheme: the utility model provides a lithium battery cap, includes insulating crust, from last top cap, explosion-proof piece, insulating circle and the orifice plate of having set gradually extremely down in the insulating crust, be provided with the ascending first bellying of direction on the top cap, top cap lock joint is on the explosion-proof piece, the explosion-proof piece is provided with the decurrent second bellying of direction, the inside buckling of edge part of explosion-proof piece will the edge part joint of top cap, be provided with the shell fragment between first bellying, the second bellying, just shell fragment one end welding is at first bellying, and the other end is buckled downwards and is fixed on the second bellying, insulating circle sets up on the second bellying, the orifice plate is glued on the explosion-proof piece and including the insulating circle parcel, the central point of second bellying put with the central point of orifice plate puts welded fastening.

Preferably, a counter bore is arranged at the center of the orifice plate, and the bottom of the counter bore and the center of the second boss are fixed through ultrasonic welding or laser welding.

Preferably, a through hole is formed in the center of the first protruding part.

Preferably, the second protrusion is an arc-shaped protrusion.

Preferably, the explosion-proof sheet is made of aluminum.

Preferably, a PTC thermistor ring is arranged between the top cover and the explosion-proof sheet.

Preferably, the explosion-proof sheet is provided with an annular groove for placing the insulating ring.

The beneficial effects of the utility model reside in that: set up first bellying on the top cap and regard as the positive pole of lithium cell, can be better distinguish with the negative pole. Set up the shell fragment in first bellying, the other end welding of shell fragment is on the second bellying of explosion-proof piece, sets up the shell fragment and provides a pulling force to the top cap direction with the second bellying, sets up the resilience force that the shell fragment has strengthened the second bellying. The second bellying is the arc arch, and itself has an effort of rebounding to the top cap direction, and the arc arch for preventing the explosion-proof piece causes the not enough of resilience force under long-time tensioning state, and the shell fragment of setting will provide a pulling force to the roof direction, and very big increase has put into the security in the use, has reduced the equipment loss because of short circuit fault causes, has practiced thrift use cost. High-voltage current and the high temperature that produces can be used in the orifice plate when the short circuit phenomenon takes place for the lithium cell, only through laser welding or ultrasonic bonding's solder joint electrically conductive connection in the counter bore between orifice plate and the explosion-proof piece, because the explosion-proof piece uses the preparation of metal aluminium, under high temperature, the solder joint on the explosion-proof piece can drop under high temperature, and then realizes the function that opens circuit with the disconnection of orifice plate and explosion-proof piece. The counter bore is arranged on the pore plate, so that the thickness of the plate can be better welded during welding, the power wasted by penetrating through the pore plate is reduced, and the welding effect is enhanced. The part of the top cover in annular contact with the explosion-proof sheet is provided with a PTC annular thermistor gasket, the resistance of the PTC thermistor is set to be higher under the condition that the temperature is higher, the contact between the top cover and the explosion-proof sheet is reduced, the temperature is concentrated on welding points of the explosion-proof sheet and the pore plate, and the welding points can be melted better and faster to realize circuit breaking.

Drawings

FIG. 1 is a sectional view of the main structure of the present invention;

fig. 2 is a top view of the present invention;

fig. 3 is a bottom view of the present invention;

wherein: 1. a top cover; 101. a spring plate; 102. a through hole; 2. a PTC thermistor; 3. an explosion-proof sheet; 4. an annular groove; 401. an insulating ring; 5. insulating glue; 6. an insulating sheath; 7. an orifice plate; 8. a counter bore; 801. and (7) welding points.

Detailed Description

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, 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.

Example 1

As shown in fig. 1-3: the utility model provides a lithium battery cap, including insulating crust 6, from the top down has set gradually top cap 1 in the insulating crust 6, explosion-proof piece 3, insulating circle 401 and orifice plate 7, be provided with 2 annular gaskets of PTC thermistor in the part of top cap 1 with 3 annular contacts of explosion-proof piece, it is higher more high to set up the resistance of PTC thermistor 2 under the higher condition of temperature, the contact that has reduced top cap 1 and explosion-proof piece 3 and then concentrate on the solder joint of explosion-proof piece 3 with the orifice plate 7 with the temperature, can melt the solder joint better faster and realize opening circuit, the security performance has been strengthened. Be provided with the ascending first bellying of direction on top cap 1, first bellying inboard is fixed with shell fragment 101, and top cap 1 level is detained on explosion-proof piece 3, is provided with the second bellying of direction decurrent on explosion-proof piece 3, and the inside buckle of edge portion of explosion-proof piece 3 will the edge portion joint of top cap 1 is in inside, and shell fragment 101 one end welding is inboard at first bellying, and the downward buckle of the shell fragment 101 other end is fixed on the second bellying, sets up shell fragment 101 in first bellying, and the other end welding of shell fragment 101 is on the second bellying of explosion-proof piece 3, sets up shell fragment 101 and provides a pulling force to top cap 1 direction with the second bellying, sets up shell fragment 101 and has strengthened the resilience force of second bellying. The second bellying is the arc arch, and itself has an effort of kick-backing to top cap 1 direction, and in order to prevent that the arc arch of explosion-proof piece 3 from causing the not enough of resilience force under long-time tensioning state, the shell fragment 101 of setting will provide a pulling force to top cap 1 direction, very big increase put into the security in the use, reduced the equipment loss because of short circuit fault causes, practiced thrift use cost. Insulating ring 401 sets up on the second bellying, is provided with the annular groove 4 that is used for placing insulating ring 401 on the explosion-proof piece 3, uses insulating ring 401 to separate orifice plate 7 and explosion-proof piece 3 better realization insulating, only leaves explosion-proof piece 3 center and orifice plate 7 center welding electrically conductive, reinforcing security performance. The pore plate 7 is glued on the explosion-proof sheet 3 by using the insulating glue 5 and wraps the insulating ring 401, a counter bore 8 is arranged at the center of the pore plate, and the center of the bottom of the counter bore 8 and the center of the second boss are fixed by ultrasonic welding or laser welding. The counter bore 8 is arranged on the pore plate 7, so that the thickness of the plate can be better welded during welding, the waste power during penetration of the pore plate 7 is reduced, and the welding effect is enhanced. High-voltage current and the high temperature that produces can be used in orifice plate 7 when the short circuit phenomenon takes place for the lithium cell, only through laser welding or ultrasonic bonding's solder joint 801 electrically conductive connection in counter bore 8 between orifice plate 7 and explosion-proof piece 3, explosion-proof piece 3 uses the metallic aluminum preparation, under high temperature, solder joint 801 on the explosion-proof piece 3 can drop under high temperature, and then realize the function that opens circuit with

orifice plate

7 and 3 disconnection of explosion-proof piece, the equipment loss because of short circuit fault causes has been reduced, use cost has been practiced thrift.

During manufacturing, a through hole 102 is formed in the center of the top cover 1, a first protruding portion of the punched position of the top cover 1 is arranged, one end of the elastic sheet 101 is fixed to one side edge of the through hole 102 in the first protruding portion, the PTC thermistor 2 is fixed to one side of the explosion-proof sheet 3, the insulating ring 401 is installed in the annular groove 4 in the other side of the explosion-proof sheet 3, and the pore plate 7 is glued to the explosion-proof sheet 3 through the insulating glue 5. Then pass the stamping workpiece through-hole 102 with shell fragment 101 jack-up, then with explosion-proof piece 3 lock joint on top cap 1 again, restart the punching machine with the other end of shell fragment 101 top on explosion-proof piece 3, form the second bellying on explosion-proof piece 3, the central point of second bellying puts and the bottom contact of counter bore 8 on the orifice plate 7, then use ultrasonic welding or laser welding with shell fragment 101, explosion-proof piece 3 and the welding of counter bore 8's on the orifice plate 7 back together, take out from the punching machine, place in insulating crust 6 again at last, accomplish the processing to the lithium cell block.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a lithium battery cap, includes insulating crust its characterized in that: the explosion-proof piece is provided with the second bellying of direction decurrent, the edge part of explosion-proof piece is inwards buckled and will the edge part joint of top cap, be provided with the shell fragment between first bellying, second bellying, just shell fragment one end welding is at first bellying, and the other end is buckled downwards and is fixed on the second bellying, the insulating collar sets up on the second bellying, the orifice plate is glued on the explosion-proof piece and including the insulating collar parcel, the central point of second bellying put with the central point of orifice plate puts welded fastening.

2. A lithium battery cap as claimed in claim 1, characterized in that: and a counter bore is arranged at the central position of the pore plate, and the bottom of the counter bore and the central position of the second bulge are fixed through ultrasonic welding or laser welding.

3. A lithium battery cap as claimed in claim 1, characterized in that: the center of the first bulge is provided with a through hole.

4. A lithium battery cap as claimed in claim 1, characterized in that: the second boss is an arc-shaped boss.

5. A lithium battery cap as claimed in claim 1, characterized in that: the explosion-proof sheet is made of aluminum.

6. A lithium battery cap as claimed in claim 1, characterized in that: and a PTC thermistor ring is arranged between the top cover and the explosion-proof sheet.

7. A lithium battery cap as claimed in claim 1, characterized in that: and the explosion-proof sheet is provided with an annular groove for placing an insulating ring.