A battery negative tab and battery

Abstract

The invention discloses a negative pole ear of a battery and a battery, belonging to the technical field of batteries. The battery negative tab provided by the present invention includes a tab body, and the tab body has two opposite sides for contacting with the battery separator, each side is provided with a conductive negative thermal expansion material layer. By providing a conductive negative thermal expansion material layer on the side of the tab body in contact with the battery separator, the burrs on both sides of the tab body can be effectively covered without affecting the conductivity of the negative tab body. And when the temperature of the lug body rises, the negative thermal expansion material layer can maintain a state of negative expansion, thereby maintaining a good coverage of the burrs to a large extent, preventing the burrs from penetrating the negative thermal expansion material layer and contacting the battery separator, and improving the battery life. The service life and usage of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery negative tab and a battery using the negative tab. Background technique [0002] Lithium battery is an important branch of batteries. Lithium battery specifically refers to batteries containing lithium in the electrochemical system. Using lithium batteries as an energy source can have stable voltage and current, and has the advantages of being able to supply power stably for a long time, being less affected by the outside world, simple in structure, easy to carry, and easy to charge and discharge. Therefore, lithium batteries are widely used. It is used in automobiles as the power source of automobiles. [0003] At present, most of the cooling systems of domestic automotive lithium battery modules adopt natural cooling schemes. During the ride, the temperature of the lithium battery is generally above 40 degrees Celsius. After the vehicle stops running, the temperatu...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are mainly two control methods for the burr at the negative ear of the battery. One is to paste high-temperature tape on the negative ear to prevent the burr from directly contacting the diaphragm. When the negative tab increases significantly, it is still unavoidable that the burrs will puncture the tape and then split the diaphragm; another method is to pass the mechanically cut negative tab through a grinding mechanism, and use the grinding mechanism to smooth the burrs on both sides of the negative tab, thereby Avoid burrs to cut the diaphragm, but this method not only has high cost, troublesome operation, high requirements on the grinding precision of the grinding mechanism, and it is difficult to control the consistency of burrs, but also easily leads to grinding transition during the grinding process, resulting in damage to the negative tab

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