High-temperature safety battery cell

Abstract

The invention discloses a high-temperature safety battery cell. The high-temperature safety battery cell comprises diaphragms, a positive pole piece and a negative pole piece, wherein the diaphragms are arranged between the positive pole piece and the negative pole piece at intervals, two adjacent diaphragms are fixed in a bonding manner, and a bonding point is disposed at the outer side of the positive pole piece or the negative pole piece. The high-temperature safety battery cell has the advantages that due to the fixing effect of the bonding point, the heat shrinkage and high temperature resistance of the diaphragms are improved, the contact probability of the positive pole piece and negative pole piece is reduced, and the high-temperature short-circuit risk is decreased; and meanwhile, the diaphragms are fixed in an assisting manner in a stacking structural unit, so that the shifting of the positive pole piece and negative pole piece is avoided, the short circuit caused by the loose folding of the diaphragms can be prevented, the safety potential hazard is avoided, the structure is stable, the safety is high, and the good quality of the battery cell is guaranteed.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-temperature safe electric core. Background technique [0002] China is the world's largest manufacturer of lithium-ion batteries, as well as the second largest producer and exporter in the world. At present, the growth rate of lithium-ion batteries in my country is maintained at about 10%, so the use of lithium-ion batteries is particularly important. . In the existing stacked-folded battery cells, the diaphragm will shrink at high temperature, and there will be a risk of contraction of the diaphragm on all sides, resulting in a short circuit between the positive and negative electrodes; winding and Z-shaped laminated cells also have both sides of the pole piece in the axial direction The shrinkage of the diaphragm at high temperature leads to the risk of short circuit between the positive and negative electrodes. The short circuit of the positive and negative electrod...

AI Technical Summary

Problems solved by technology

In the existing stacked-folded battery cells, the diaphragm will shrink at high temperature, and there will be a risk of contraction of the diaphragm on all sides, resulting in a short circuit between the positive and negative electrodes; winding and Z-shaped laminated cells also have both sides of the pole piece in the axial direction The shrinkage of the diaphragm at high temperature leads to the risk of short circuit between the positive and negative electrodes. The short circuit of the positive and negative electrodes will cause safety risks such as fire and explosion, which will cause safety hazards and reduce the safety and reliability of lithium-ion batteries.

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