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Method for determining storage time of battery cells

A technology for storing time and cells, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of long shelving time, a large number of batteries, and increase the cost of batteries, and achieve a reasonably certain effect.

Inactive Publication Date: 2020-01-17
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The selection of abnormal batteries often depends on the length of storage time. The longer the time, the easier it is to pick out abnormal batteries. Otherwise, it is not easy to be picked out. However, if the time is too long, the production cycle will be increased and the battery cost will be increased.
Therefore, the research on determining the storage time of batteries has always been the focus of process optimization for many battery companies, but there is no general, scientific and effective method at this stage, and the optimization of storage processes and the determination of the storage time of new systems require a lot of Batteries, long shelf life, and with a certain degree of blindness

Method used

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  • Method for determining storage time of battery cells
  • Method for determining storage time of battery cells
  • Method for determining storage time of battery cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for determining the battery cell storage time, the steps are as follows:

[0024] Select metal Fe debris, filter it with a 200-mesh sieve, and remove the filtered material (ie seeds) in the lower layer for use. Divide the batteries that have not been filled with liquid after baking into two groups, namely the experimental group and the control group. core, add NMP solvent to the positive electrode sheet on the outer layer of the battery cell, and then inoculate a seed of metal debris. The moisture and NMP introduced during the operation, after normal pre-charging of the battery cells, were stored at a temperature of 25±2°C, and the daily voltage changes before and after storage were compared between the experimental group and the control group, as shown in Table 1 below, and the control group and the control group were recorded. When the pressure difference of the experimental group is greater than 5mV, the time required for the battery cell is 7D, which is the...

Embodiment 2

[0028] A method for determining the battery cell storage time, the steps are as follows:

[0029] Select metal FeS debris, filter it with a 200-mesh sieve, and remove the filtered material (ie seeds) in the lower layer for use. Divide the batteries that have not been filled with liquid after baking into two groups, namely the experimental group and the control group. core, add NMP solvent to the positive electrode sheet on the outer layer of the battery cell, and then inoculate 5 metal debris seeds. The moisture and NMP introduced during the operation, after the battery is pre-charged normally, it is stored at a temperature of 25±2°C, and the daily voltage changes before and after storage are compared between the experimental group and the control group, as shown in Table 2 below, and the control group and the control group are recorded. When the pressure difference of the experimental group is greater than 5mV, the time required for the battery cell is 4D, which is the storag...

Embodiment 3

[0033] A method for determining the battery cell storage time, the steps are as follows:

[0034] Select the metal S304 debris, filter it with a 100-mesh sieve, and remove the filtered material (ie seeds) in the lower layer for use. Divide the batteries that have not been filled with liquid after baking into two groups, namely the experimental group and the control group. core, add NMP solvent to the positive electrode sheet on the outer layer of the battery, and then inoculate 1 metal debris seed. After the NMP volatilizes and restore the original appearance of the battery, place the experimental group and the control group in an environment of 55 ° C, bake for 16 hours, remove The water and NMP introduced during the operation, after the battery is pre-charged normally, store it at a temperature of 25±2°C, compare the daily voltage changes before and after storage in the experimental group and the control group, as shown in Table 3 below, record the control group and the contr...

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Abstract

The invention discloses a method for determining storage time of battery cells, and the method can quickly determine storage time required for picking out bad battery cells. The method includes the following steps: 1) preparing a seed battery cell containing metal fragments; 2) storing battery cells at a set temperature after pre-charging the battery cells and recording daily voltage of the battery cells. The method of the invention adopts precise introduction of the metal fragments to prepare the seed battery cell, simulates cells with large self-discharge caused by a micro short circuit, anddetermines the storage time required to pick out the bad battery cells by voltage drop of the battery cells. The method has the advantages of less experimental samples, high versatility, scientific rationality, and easy operation.

Description

technical field [0001] The invention relates to the technical field of lithium battery cells, in particular to a method for determining the storage time of the cells. Background technique [0002] Battery storage is the process of shelving the battery at a set temperature for a period of time, and selecting abnormal batteries by detecting the voltage difference before and after shelving. This process is a key technology in the cell preparation process. Picking out low-voltage abnormal cells can effectively prevent large self-discharging cells from being mixed into good products and improve the safety of the cells. [0003] The low voltage of the battery cell is mainly divided into physical micro-short circuit and chemical reaction. Compared with chemical reaction, physical micro-short circuit does not affect the capacity of the battery cell, and it is difficult to pick out the specific capacity. It is often related to external factors, such as dust, burrs and Metal debris, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/388
CPCG01R31/3865G01R31/388
Inventor 张延强李蒙赵冲冲张若涛刘福园马安博
Owner 郑州中科新兴产业技术研究院
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