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A kind of lithium-ion battery preformation into negative pressure failure detection method

A lithium-ion battery and detection method technology, applied in the field of detection of lithium-ion battery preformed negative pressure failure, can solve the problems of negative pressure system failure, heavy workload, complex system structure, etc., to ensure reliability and avoid circulation Effect

Active Publication Date: 2020-06-30
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The structure of the negative pressure exhaust pre-formation system is complex, and the negative pressure system will fail after the pipeline is bent or blocked. In the manufacturing process, this method has a large workload and cannot avoid the transfer of defective products to the next process

Method used

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  • A kind of lithium-ion battery preformation into negative pressure failure detection method
  • A kind of lithium-ion battery preformation into negative pressure failure detection method

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Embodiment 1

[0023] Taking a lithium iron phosphate 40Ah lithium ion battery as an example, the method for detecting failure of a lithium ion battery preformed into negative pressure according to the present invention is described, which specifically includes the following steps.

[0024] Step 1: Randomly select 30pcs of lithium-ion batteries produced under the same material system, the same baking and soaking process conditions, and divide them into two groups, A and B, with 15pcs in each group, and put them into different trays.

[0025] Step 2: Put the tray and lithium-ion battery into the pre-formation charge-discharge cabinet for pre-formation charging. The ambient temperature is 45°C during charging. The pressure value can be differentiated, and the negative pressure value can be set through software or equipment.

[0026] In the pre-formation charging, the charging steps are listed in the following table 1, with the charging time as the cut-off condition, the maximum charging curren...

Embodiment 2

[0034] Taking the ternary system 60Ah lithium-ion battery as an example, the method for detecting the failure of the lithium-ion battery preformed into negative pressure according to the present invention is described, which specifically includes the following steps.

[0035] Step 1: Randomly select 30pcs of lithium-ion batteries produced under the same material system, the same baking and soaking process conditions, and divide them into two groups, A and B, with 15pcs in each group, and put them into different trays.

[0036] Step 2: Put the tray and lithium-ion battery into the pre-formation charge-discharge cabinet for pre-formation charging. The ambient temperature is 40°C during charging. The pressure value can be differentiated, and the negative pressure value can be set through software or equipment.

[0037] In the pre-formation charging, each charging step is listed in Table 2 below, with the charging voltage as the cut-off condition, the maximum charging current is 0...

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Abstract

The invention discloses a lithium ion battery preformation negative pressure failure detection method. The method comprises the steps of selecting a plurality of lithium ion batteries prepared from the same material system under same condition, equally dividing the lithium ion batteries into groups A and B; performing preformation charging on lithium ion batteries of groups A and B separately, wherein lithium ion batteries of group A are vacuumized in preformation charging, lithium ion batteries of group B are not vacuumized in preformation charging but undergo differentiation; after preformation charging, reading charging energy of each lithium ion battery, and selecting a number within a range between a maximum and a minimum as a negative pressure failure determining value X; and under the same condition, performing preformation charging on to-be-tested lithium ion batteries prepared from the same material system under same condition, comparing acquired charging energy QN with the negative pressure failure determining value X, and detecting whether negative pressure of the to-be-detected lithium ion battery fails. The method can identify batteries with failing negative pressure accurately timely, checks a batch of products completely, and prevents substandard products from flowing in production.

Description

technical field [0001] The invention relates to the manufacture of lithium-ion batteries, in particular to a method for detecting the failure of the lithium-ion batteries to preform into negative pressure. Background technique [0002] Lithium-ion batteries are widely used in the digital and power energy industries due to their advantages such as high energy density, long cycle life and no memory effect. However, with the continuous expansion of its application range, its performance has been paid more and more attention. In the manufacturing process of lithium-ion batteries, whether it is to improve the pre-formation and charging process, the gas generated by the formation of the SEI film stays on the surface of the negative electrode, resulting in dead zones at the interface and the problem of lithium precipitation, or to improve the workshop environment and avoid pre-formation. Considering various aspects such as exhaust gas and inorganic gas into the workshop, the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/378H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 苗应龙陈卓汪泽滨
Owner ETRUST POWER ETP GRP LTD