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Matching method of lithium ion batteries

A lithium-ion battery and grouping technology, which is applied in the field of lithium-ion batteries, can solve problems such as voltage, internal resistance, and capacity changes that are not considered, so as to reduce the occurrence of bad phenomena in the later stage, improve consistency, and battery utilization. Improve the effect of bin capacity difference

Inactive Publication Date: 2020-10-16
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This matching method does not take into account the voltage, internal resistance, and capacity changes related to the stability of the battery chemical system in the actual application of the battery pack. certain risk

Method used

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  • Matching method of lithium ion batteries
  • Matching method of lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take our company's 726385P / 5800mAh battery cells as an example through the series connection of three cells.

[0022] The first step: paste the QR code on the 726385P / 5800mAh type cell battery, and then paste the surface protective film on the surface of the cell;

[0023] Step 2: Charge to full power with 0.5C current constant current and constant voltage, cut-off current 0.02C; then constant current discharge to cut-off voltage, and then charge the battery with constant current and constant voltage to 3.80V again to ensure the voltage of each battery Consistency, record the battery discharge capacity at the same time, remove the batteries with a capacity outside the range of 5850mAh~6270mAh, and then divide the remaining batteries according to the capacity difference of 70mAh, a total of six levels;

[0024] Step 3: Leave the cells in the second step in the cabinet for 5 hours, then test the voltage V1 and internal resistance R1 of the cells, and record them through t...

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Abstract

The invention discloses a lithium ion battery matching method, which comprises the following steps of 1, pasting a two-dimensional code on a battery, and then pasting a surface protection film on thesurface of a battery core; 2, screening capacity consistency, and grading; 3, carrying out preliminary OCV1 screening through V1 and R1; 4, aging the battery core; 5, carrying out OCV2 screening, andgrading; and 6, connecting the graded battery cores in series according to a certain number, carrying out dynamic differential pressure consistency screening, and grading and storing the screened qualified batteries. According to the invention, by improving the grading capacity difference of battery cores and combining static matching and dynamic matching, the consistency of screened batteries andthe utilization rate of the battery cores are improved, and the undesirable phenomenon in the later period of battery delivery is reduced; and a two-dimensional code is pasted on the surface of the battery core, so that the BIS-battery information management system can collect the information of the single batteries conveniently, unqualified batteries can be screened quickly, the single batteriescan be graded, and the labor and time costs are reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery assembly method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, and environmental friendliness, and have been widely used in the field of 3C products. In recent years, with the implementation of new energy vehicles, its application in power batteries, energy storage batteries and other fields has also been continuously improved. At present, single lithium-ion batteries can meet industry, national and international industry technical standards in terms of charge and discharge, cycle life performance, and safety performance. However, in order to achieve the applicable voltage and capacity, it is unavoidable that the batteries need to be expanded and boosted through parallel or series connection or series-parallel connection. Once multiple sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/058B07C5/344
CPCB07C5/344H01M10/058H01M10/4207H01M10/441Y02E60/10Y02P70/50
Inventor 田军李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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