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Cell characteristic vector based lithium ion cell configuration method

A technology of lithium-ion batteries and eigenvectors, which is applied in the fields of non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary battery repair/maintenance, etc. It can solve the problems of poor overall performance of battery packs and inability to fully reflect battery differences, etc.

Inactive Publication Date: 2012-03-28
武汉银泰科技燃料电池有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that these matching parameters cannot fully reflect the differences between batteries, resulting in poor overall performance of the battery pack after assembly and use.

Method used

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  • Cell characteristic vector based lithium ion cell configuration method
  • Cell characteristic vector based lithium ion cell configuration method
  • Cell characteristic vector based lithium ion cell configuration method

Examples

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Embodiment Construction

[0029] The present embodiment selects the IMP1865130 battery (nominal capacity 10Ah) that our company produces based on the lithium-ion battery grouping method of battery feature vector, and production batch is 20110706; It comprises the following steps:

[0030] 1. Place the lithium-ion battery to be assembled on the lithium-ion battery program-controlled test equipment for charge and discharge detection. The detection process is set as:

[0031] 1.1. Constant current discharge: constant current 2A, cut-off voltage 2.7V,

[0032] 1.2, standing still: standing time 30 minutes,

[0033] 1.3. Constant current charging: constant current 20A, cut-off voltage 4.2V,

[0034] 1.4. Constant voltage charging: constant voltage 4.2V, cut-off current 200mA,

[0035] 1.5, standing still: standing time 30 minutes,

[0036] 1.6. Constant current discharge: constant current 20A, cut-off voltage 2.7V,

[0037] 1.7, standing still: standing time 240 minutes;

[0038] 2. Collect and record ...

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PUM

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Abstract

The invention discloses a cell characteristic vector based lithium ion cell configuration method, which comprises the following steps of: carrying out one-time 0.2C discharge on cells to be configured, followed by 2C charge and discharge, finally standing for a while, recording the 2C discharge capacity C0.5, the ratio CI of constant voltage capacity to constant current capacity during the 2C charge, the ratio V0 of recovery voltage to discharge lower limit voltage after the final step of standing, and the correlation coefficient rYS of the characteristic vector formed by the 2C constant current charge and 2C constant current discharge voltage values of the cells and the standard characteristic vector, determining an appropriate grading numerical range for grading according to the C0.5, CI, V0 and Rys, and configuring individual cells within the specified range. The method provided by the invention is used to fully present the difference between cells and screen out cells with similar consistency for assembling and usage, thus raising the performance of battery packs.

Description

technical field [0001] The invention relates to lithium-ion battery grouping, in particular to a lithium-ion battery grouping method based on battery feature vectors. Background technique [0002] With the development of society, the application of lithium-ion batteries is becoming more and more extensive. In practical applications, it is often necessary to assemble dozens or even hundreds of single cells in series or in parallel to meet the demand for high voltage and high capacity. Theoretically speaking, the inconsistency between single cells absolutely exists, so in practical applications, it is necessary to select single cells with relatively good consistency through the matching strategy for matching and assembly, so that it is possible to make the battery The overall performance of the group is satisfactory. [0003] The currently commonly used grouping method is: according to the capacity, internal resistance, voltage, self-discharge, etc. It can be assembled and ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/42
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 闻涛蔡浩
Owner 武汉银泰科技燃料电池有限公司
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