CN103311567A - Novel lithium battery - Google Patents

Abstract

The invention discloses a new type of lithium battery, which comprises a battery core and an aluminum case covered on the battery core. One end of the battery core is connected to a nickel collector ring, and the other end is connected to an aluminum collector ring; the outer side of the nickel collector ring is arranged There is a negative electrode cap, and a nickel conductive sheet is arranged between the negative electrode cap and the nickel collector ring. One end of the nickel conductive sheet is welded to the middle of the nickel collector ring by laser, and the other end of the nickel is welded to the negative electrode cap by ultrasonic welding; the shell and the aluminum collector The current coil is welded by laser, and the joint is arc-shaped. The outer side of the aluminum current collector is provided with a positive cap and a positive lead-out nut. The invention adopts an aluminum casing, which reduces the weight and improves the heat dissipation speed. The nickel conductive sheet, the nickel collector ring, and the negative electrode cap are respectively welded by laser and ultrasonic waves, and the casing and the aluminum collector ring are welded by laser, which improves the large The ability of current charging and discharging is very stable. When the internal pressure of the battery is too high, the arc part of the shell will turn over under pressure and disconnect the welding with the aluminum collector ring, which can avoid explosion.

Description

A new type of lithium battery

technical field

The invention relates to a novel lithium battery.

Background technique

Lithium batteries are widely used in mobile phones, notebook computers, MP3, MP4, video cameras and other digital devices. With the increasing capacity of lithium batteries, lithium batteries have also been used in medium and large vehicles such as electric vehicles and hybrid vehicles. get applied. However, the existing lithium batteries generally use steel casings, which are heavy and have poor heat dissipation effects. The current lead-out structure of existing lithium batteries also has defects: the negative electrode generally uses a resistance welded bottom, and the positive electrode uses a long aluminum sheet. Making a conductive handle not only severely limits the high-current charging and discharging, which affects the use effect of the battery, but also tends to cause unstable performance due to loose positive and negative electrodes. Moreover, the safety of existing lithium batteries is not high, and when the internal pressure of the battery is too high due to a fault, it is easy to explode.

Contents of the invention

In view of the deficiencies in the prior art, the object of the present invention is to provide a new type of lithium battery, which has small weight, good heat dissipation effect, improved high-current charging and discharging ability, stable performance, can avoid explosion, and greatly improves safety .

In order to achieve the above object, the technical solution adopted by the present invention is: a new type of lithium battery, including a battery cell and an aluminum casing coated on the battery cell, one end of the battery cell is connected to a nickel collector ring, and the other end is An aluminum collector ring is connected; the outer side of the nickel collector ring is provided with a negative electrode cap mounted on the first end of the housing and a negative lead-out nut driven into the inner side of the negative electrode cap from the outside of the negative electrode cap. A sealing ring is provided between the first ends, and a nickel conductive sheet is arranged between the negative electrode cap and the nickel current collector. One end of the nickel conductive sheet is welded to the middle of the nickel current collector by laser welding, and the other end of the nickel conductive sheet is passed through Ultrasonic welding on the negative electrode cap; the housing and the aluminum collector ring are welded by laser, and the connection between the housing and the aluminum collector ring is arc-shaped, and a Resin insulator, the outer side of the aluminum current collector is provided with a positive electrode cap installed on the second end of the housing and a positive lead-out nut driven into the inside of the positive electrode cap from the outside of the positive electrode cap. of stomata.

Wherein, the nickel conductive sheet is in the shape of a truncated cone.

Wherein, the middle part of the nickel current collector and the inner surface of the negative electrode cap are provided with grooves, the upper bottom surface of the nickel conductive sheet is welded in the groove in the middle part of the nickel current collector by laser welding, and the lower bottom surface of the nickel conductive sheet is welded by ultrasonic waves. Welded in the groove on the inner surface of the negative cap.

Wherein, the shell is covered with a metal explosion-proof net.

A novel lithium battery described in the present invention has the beneficial effects that: the lithium battery of the present invention adopts an aluminum casing, which not only reduces the weight, but also improves the heat dissipation speed, and the nickel conductive sheet and the nickel current collector and the negative electrode cap Through laser and ultrasonic welding respectively, the aluminum shell and the aluminum collector ring are welded by laser. Compared with the traditional resistance welding bottom and aluminum sheet conductive handle, the ability of high current charging and discharging is greatly improved, and there will be no positive and negative poles The problem of looseness, the performance is very stable, and because the connection between the shell and the aluminum collector ring is arc-shaped, when the internal pressure of the battery is too high, the arc-shaped part of the shell turns over under pressure and disconnects it from the aluminum collector The welding of ring, therefore can avoid explosion, has improved safety greatly; Also, the nickel conductive sheet among the present invention is circular truncated shape, and groove is all arranged on the negative pole block cap and nickel current collector, by the nickel conductive sheet The upper and lower bottom surfaces are welded into the corresponding grooves, which greatly improves the welding firmness of the nickel conductive sheet, the negative electrode cap and the nickel current collector, prevents the nickel conductive sheet from loosening and shifting, and further ensures the stability of performance; in addition, this The invention also strengthens the explosion-proof ability of the lithium battery by coating the metal explosion-proof net on the shell. Under the action of absorbing pressure, the lithium battery of the present invention will not explode.

Description of drawings

Fig. 1 is a structural diagram of the present invention.

Explanation of reference signs:

1. Battery cell; 2. Shell; 3. Nickel collector ring; 4. Aluminum collector ring; 5. Negative electrode cap; 6. Negative electrode lead nut; 7. Seal ring; 8. Nickel conductive sheet; 9. Resin insulator ; 10, the positive cap; 101, air hole; 11, the positive lead-out nut; 12, the metal explosion-proof net.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 1, which shows the specific structure of a preferred embodiment of the present invention, a new type of lithium battery, including a battery cell 1 and an aluminum casing 2 coated on the battery cell 1, wherein:

One end of the battery cell 1 is connected to a nickel collector ring 3, and the other end is connected to an aluminum collector ring 4; the outer side of the nickel collector ring 3 is provided with a negative electrode cap 5 mounted on the first end of the housing 2 and A negative electrode lead-out nut 6 driven into the inner side of the negative electrode cap 5 from the outside of the negative electrode cap 5, a sealing ring 7 is arranged between the negative electrode cap 5 and the first end of the housing 2, and a negative electrode cap 5 and the nickel collector ring 3 are provided There is a nickel conductive sheet 8, one end of the nickel conductive sheet 8 is welded to the middle part of the nickel current collector 3 by laser welding, and the other end of the nickel conductive sheet 8 is ultrasonically welded on the negative electrode cap 5; the housing 2 and the aluminum current collector The ring 4 is welded by laser, and the connection between the housing 2 and the aluminum collector ring 4 is arc-shaped, and a resin insulator 9 is arranged between the aluminum collector ring 4 and the second end of the housing 2. Of course, the resin insulator 9 can be used Insulators made of other materials can be used instead, but resin insulator 9 is the most cost-effective, economical and environmentally friendly, and has good insulation performance. The outside of the aluminum collector ring 4 is provided with a positive electrode cap 10 mounted on the second end of the housing 2 and a positive lead-out nut 11 driven into the inside of the positive electrode cap 10 from the outside of the positive electrode cap 10. The positive electrode cap 10 is provided with a The air holes 101 on both sides of the nut 11 are drawn out.

In order to enhance the firmness of the welding of the nickel conductive sheet 8 and the negative electrode cap 5 and the nickel current collector 3, the nickel conductive sheet 8 is in the shape of a circular platform, and the middle part of the nickel current collector 3 and the inner surface of the negative electrode cap 5 are provided with grooves , the upper bottom surface of the nickel conductive sheet 8 is laser welded in the groove in the middle of the nickel collector ring 3, and the lower bottom surface of the nickel conductive sheet 8 is ultrasonically welded in the groove on the inner surface of the negative electrode cap 5.

In order to further strengthen the explosion-proof capability, the shell 2 is coated with a metal explosion-proof net 12 .

During use, because the lithium battery of the present invention adopts the aluminum housing 2, not only has reduced weight, has also improved heat radiation speed, and nickel conductive plate 8 and nickel current collector 3, negative electrode cap 5 are welded by laser, ultrasonic respectively, aluminum The shell 2 and the aluminum current collector 4 are welded by laser. Compared with the traditional resistance welding bottom and aluminum sheet conductive handle, the ability of charging and discharging with high current is greatly improved, and the problem of loosening of the positive and negative electrodes will not occur, and the performance is very good. Stable, and because the connection between the casing 2 and the aluminum collector ring 4 is arc-shaped, when the internal pressure of the battery is too high, the arc-shaped part of the casing 2 will turn over under pressure and disconnect it from the aluminum collector ring 4 Welding, therefore can avoid explosion, has improved safety greatly; Also, the nickel conductive sheet 8 among the present invention is circular truncated shape, and groove is all arranged on the negative electrode cover cap 5 and the nickel current collector 3, by nickel conductive sheet The upper and lower bottom surfaces of 8 are welded to the corresponding grooves, which greatly improves the firmness of the welding of nickel conductive sheet 8 and negative electrode cap 5 and nickel current collector 3, and can prevent the nickel conductive sheet 8 from loosening and shifting, further ensuring the performance. stability; in addition, the present invention also strengthens the explosion-proof capability of the lithium battery by coating the metal explosion-proof net 12 on the casing 2, even if the pressure inside the battery is already before the casing 2 and the aluminum collector ring 4 are disconnected and welded. When the critical point of explosion is reached, the lithium battery of the present invention will not explode under the pressure absorbed by the metal explosion-proof net 12 .

The above are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention in any way, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.

Claims (4)

1. A novel lithium battery, characterized in that: it comprises an electric core and an aluminum casing coated on the electric core, one end of the electric core is connected with a nickel current collector, and the other end is connected with an aluminum current collector; The outer side of the nickel collector ring is provided with a negative electrode cap installed on the first end of the housing and a negative lead-out nut driven into the inner side of the negative electrode cap from the outside of the negative electrode cap. There is a sealing ring, a nickel conductive sheet is arranged between the negative electrode cap and the nickel current collector, one end of the nickel conductive sheet is welded to the middle of the nickel current collector by laser, and the other end of the nickel conductive sheet is ultrasonically welded on the negative electrode cap; The casing and the aluminum current collector are welded by laser, and the connection between the casing and the aluminum current collector is arc-shaped, and a resin insulator is arranged between the aluminum current collector and the second end of the casing, and the aluminum current collector The outer side of the ring is provided with a positive electrode cap mounted on the second end of the casing and a positive lead-out nut driven into the inside of the positive electrode cap from the outside of the positive electrode cap. The positive cap is provided with air holes on both sides of the positive lead-out nut. 2. A new type of lithium battery according to claim 1, characterized in that: the nickel conductive sheet is in the shape of a truncated cone. 3. A kind of novel lithium battery according to claim 2, it is characterized in that: the middle part of described nickel current collector and the inner side surface of negative electrode cover cap are all provided with groove, the upper bottom surface of nickel conductive plate is welded on nickel by laser. In the groove in the middle of the current collector, the lower bottom surface of the nickel conductive sheet is ultrasonically welded in the groove on the inner surface of the negative electrode cap. 4. A new type of lithium battery according to claim 1, characterized in that: the casing is coated with a metal explosion-proof net.

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