Battery cell consistency sorting method applied to energy storage lithium batteries of semi-conductor factories

Abstract

The invention relates to a battery cell consistency sorting method applied to energy storage lithium batteries of semiconductor factories. The method comprises the following steps that charging capacity, discharging capacity, internal resistance, constant-current charging ratio and multiplying power screening is carried out, the batteries in the same batch are discharged and then charged, and the batteries of which the difference value between the charging capacity and rated capacity meets the requirement are screened out; the screened batteries are discharged and then charged, and the batteries of which the difference value between the discharge capacity and the rated capacity and the discharge capacity meet the requirements are screened out; and the screened batteries are charged, the batteries with the internal resistance difference less than or equal to 0.2 milliohm are screened out, and the ratio of the constant-current charging capacity to the charging capacity is greater than or equal to 98%. The screened batteries are charged and then discharged, and the batteries with the voltage drop larger than or equal to 2.85 V and the ratio of the discharging capacity to the rated capacity larger than or equal to 90% are screened out. The method has the advantages that the screened lithium ion batteries can keep good battery consistency in the aspects of charging capacity, rate discharge and the like, and in addition, the lithium ion batteries screened by the screening standards related to charging capacity, rate discharge and the like are more suitable for the semiconductor factories.

Description

technical field [0001] The invention belongs to the technical field of lithium battery application and lithium battery cell sorting, in particular to a cell sorting method for energy storage lithium batteries in semiconductor factories. Background technique [0002] In recent years, the application of lithium-ion batteries has become more and more extensive. In addition to traditional base station energy storage and automotive power lithium batteries, the backup anti-drop power supply of semiconductor factories is also gradually using lithium batteries, which have a high discharge rate and small size. In semiconductor factory applications, it is necessary to keep the lithium battery in the floating state for a long time, so in the charging process, the floating charging voltage value is very critical. After many experimental demonstrations, the single cell 3.4V floating charging voltage is the most suitable. By sorting batteries with a charging capacity of 3.4V, it is more s...

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Problems solved by technology

[0004] Existing patents such as CN111136033A, CN110085935A, CN 111438083A, etc. all propose a screening method for the consistency of lithium electronic batteries, but these screening methods still have the problem of low pertinence, especially and mainly for lithium ion batteries used in semiconductor factories. batteries, there is no guarantee that such screened batteries are particularly suitable for use in semiconductor fabs

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