Production method of anti-acupuncture lithium battery

Abstract

The invention relates to the technical field of lithium battery preparation, and discloses a preparation method of an anti-acupuncture lithium battery, which specifically includes the following steps: S1: grinding the peaks and valleys of the wavy inner and outer baffles treatment, and the insulating sheet is adhered to the peaks and valleys of the inner baffle and the outer baffle in turn, and after the adhesion is completed, it is lowered to room temperature for use; S2: The inner baffle is punched to make the inner baffle The valley of the baffle is abutted on the outer side wall of the inner core of the battery, and glue is poured into the gap between the inner baffle and the inner core of the battery, and the glue is solidified to form an inner adhesive layer. The anti-acupuncture lithium battery prepared by the present invention is provided with an inner baffle plate and an outer baffle plate respectively, and the outer acupuncture battery needs to pass through the outer adhesive glue, the outer baffle plate, the insulating glue and the inner baffle plate in sequence when the inside of the outer needle punches the battery. Only the sheet and the inner adhesive can penetrate into the inner core of the battery, which increases the difficulty of piercing and enhances the anti-acupuncture performance of the battery.

Description

technical field [0001] The patent of the present invention relates to the technical field of lithium battery preparation, in particular, to a preparation method of acupuncture-resistant lithium battery. Background technique [0002] Batteries are commonly used equipment in life. At present, lithium batteries are very popular, and safety issues are considered in the design of batteries. Especially for lithium batteries, due to the very reactive nature of lithium ions, they are extremely prone to explosion if they fail. Therefore, for ordinary lithium batteries, overcurrent protection measures are designed inside to prevent the internal temperature of the battery from being too high. [0003] However, the overcurrent protection of the lithium battery is most directly realized by the overcurrent protection board, which is aimed at the short circuit of the external circuit; for the failure of the battery core, the protection board cannot protect it; at this time, generally It ...

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Problems solved by technology

[0003] However, the overcurrent protection of lithium batteries is most directly realized through the overcurrent protection board, which is aimed at the short circuit of the external circuit; for the failure of the battery inner core, the protection board cannot be protected; at this time, generally It relies on the thermal effect generated by the diaphragm of the inner core of the battery to shrink the through holes on the surface of the diaphragm, so that ions cannot pass through the diaphragm to prevent the chemical reaction inside the battery; however, due to the limitations of technology and materials, even expensive diaphragms , the shrinkage effect of the through hole is also very limited, therefore, in the case of a serious short circuit inside the battery, the safety protection performance of the separator is very weak

[0004] The typical situation is external needle-punching of the battery. For example, some people with poor safety awareness, especially children, when playing with the battery, if they pierce the battery with a sharp needle, the metal needle will penetrate the positive and negative materials inside the battery, resulting in The battery is directly short-circuited. In this case, the internal current of the battery will rise sharply, which will cause the internal temperature of the battery to rise rapidly. It is difficult for ordinary diaphragms to resist this rapid reaction, which will cause the battery to explode and cause disasters.

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