Manufacturing method of anti-needling lithium battery

Abstract

The invention relates to the technical field of lithium battery preparation, and discloses a manufacturing method of an anti-needling lithium battery, which specifically comprises the following steps: S1, polishing the peaks and valleys of a wavy inner separation sheet and a wavy outer separation sheet, sequentially adhering insulating sheets to the peaks and valleys of the inner separation sheet and the outer separation sheet, and cooling to room temperature for later use after adhesion is completed; and S2, performing stamping treatment on the inner separation sheet to enable the sheet valley of the inner separation sheet to abut against the outer side wall of the battery inner core, and pouring glue into a gap between the inner separation sheet and the battery inner core to form an inner adhesive layer after the glue is solidified. The inner partition piece and the outer partition piece are arranged in the prepared anti-needling lithium battery, when the interior of the battery is needled externally, the interior of the battery needs to be punctured through the outer adhesive, the outer partition piece, the insulation paste, the inner partition piece and the inner adhesive in sequence, the puncture difficulty is increased, and the anti-needling performance of the battery is enhanced.

Description

technical field [0001] The patent of the present invention relates to the technical field of preparation of lithium batteries, in particular, to a production method of anti-needle lithium batteries. Background technique [0002] Batteries are common equipment in daily life. At present, lithium batteries are very popular, and safety issues will be considered in the design of batteries. Especially for lithium batteries, due to the very active chemical nature of lithium ions, it is extremely easy to explode if there is a malfunction. 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 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 t...

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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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