Short-circuit detection method of laminated lithium ion battery cell and battery cell unit removing method

Abstract

The invention relates to a short-circuit detection method of a laminated lithium ion battery cell and a battery cell unit removing method. The detection method comprises the following steps: a first probe is conductively connected with a tab on each first pole piece in a first pole piece group; a second pole piece group is used as a target pole piece group, and the detection operation is as follows: a second probe is electrically connected with tabs of a part of second pole pieces in the target pole piece group and tabs of another part of second pole pieces in the target pole piece group in sequence, so that short-circuit detection is carried out on one part of second pole pieces and the other part of second pole pieces respectively; and for a target part of second pole pieces which might contain short-circuit pole pieces, the target part of second pole pieces is taken as a new target pole piece group, and detection operation is carried out again until there is only one second pole piece in the target part of second pole pieces which might contain short-circuit pole pieces, and a battery cell unit where the second pole piece is located is determined as the battery cell unit with short circuit. Therefore, the short-circuit position is found, and the whole battery cell is prevented from being discarded.

Description

technical field [0001] The present disclosure relates to the technical field of lithium-ion batteries, and in particular, to a method for detecting a short circuit of a laminated lithium-ion battery cell and a method for removing battery cells. Background technique [0002] The lamination process of lithium-ion batteries is a process of combining multiple positive and negative electrodes and multiple separators into batteries, and its yield directly affects the yield of the entire assembly section. Currently, one of the main constraints on the lamination yield The biggest defect is a short circuit defect. Since the specific location of the short circuit cannot be found quickly and effectively, the cells that have the short circuit are often discarded, resulting in low production yields and increasing the cost burden of the enterprise. Contents of the invention [0003] The purpose of the present disclosure is to provide a short-circuit detection method for laminated lithiu...

AI Technical Summary

Problems solved by technology

[0002] The lamination process of lithium-ion batteries is a process of combining multiple positive and negative electrodes and multiple separators into batteries, and its yield directly affects the yield of the entire assembly section. Currently, one of the main constraints on the lamination yield The biggest defect is the short-circuit defect. Since the specific location of the short-circuit cannot be found quickly and effectively, the short-circuited batteries are often discarded, resulting in low production yield and increasing the cost burden of the enterprise.

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