Unlock instant, AI-driven research and patent intelligence for your innovation.

A screening method and matching method for improving the consistency of ternary lithium-ion battery packs

A lithium-ion battery pack and screening method technology, applied in sorting and other directions, can solve the problems of low cell utilization, capacity, and poor consistency of pressure difference, etc., and achieve the effect of easy operation

Active Publication Date: 2019-07-05
合肥国轩电池有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the charge-discharge curve of the ternary battery is quite different from that of lithium iron phosphate. The ternary battery packs assembled by the existing screening method have poor consistency in capacity and pressure difference, resulting in very low utilization of the battery cells. Therefore, a new screening and matching method is needed to improve the consistency of the performance of the ternary battery pack

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A screening method and matching method for improving the consistency of ternary lithium-ion battery packs
  • A screening method and matching method for improving the consistency of ternary lithium-ion battery packs
  • A screening method and matching method for improving the consistency of ternary lithium-ion battery packs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A screening method for improving the consistency of a ternary lithium-ion battery pack, comprising the following steps:

[0026] S1. At room temperature, a number of single batteries with a rated capacity C=30Ah were subjected to 0.5C charge-discharge rate cycles for 3 times, and finally the SOC of the battery was set to 50%, and discharged at 0.5C for 10s, and each The constant current charging ratio, discharge capacity C1 and DC internal resistance R of 10s discharge of the single battery during the third charge and discharge;

[0027] S2. Place a single battery with a rated capacity of C=30Ah at room temperature for 2 days, and measure the open circuit voltage U1 and internal resistance r of the battery; place a single battery with a rated capacity of C at room temperature for 7 days, and measure The open circuit voltage U2 of the battery is used to calculate the self-discharge rate K;

[0028] S3. Select a single battery with a C1 of 30.9-32.1Ah and a constant curr...

Embodiment 2

[0046] A screening method for improving the consistency of a ternary lithium-ion battery pack, comprising the following steps:

[0047]S1. At room temperature, multiple single batteries with a rated capacity C=25Ah were subjected to 0.5C charge-discharge rate cycles for 3 times, and finally the SOC of the battery was set to 50%, and discharged at 0.5C for 10s, and each The constant current charging ratio, discharge capacity C1 and DC internal resistance R of 10s discharge of the single battery during the third charge and discharge;

[0048] S2. Place a single battery with a rated capacity of C=30Ah at room temperature for 2 days, and measure the open circuit voltage U1 and internal resistance r of the battery; place a single battery with a rated capacity of C at room temperature for 7 days, and measure The open circuit voltage U2 of the battery is used to calculate the self-discharge rate K;

[0049] S3. Select a single battery with a C1 of 25.75-26.75Ah and a constant curren...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a screening method for improving consistency of a ternary lithium ion battery pack and further discloses a grouping method for improving the consistency of the ternary lithiumion battery pack. The screening method comprises the following steps that (1), the constant current charge ratio, the discharge capacity C1 and the direct current internal resistance R of discharge for 10 s of all single batteries during third-time charge and discharge are measured; (2), the battery internal resistance r, the open-circuit voltage U2 and the automatic discharge rate K of the singlebatteries with the rated capacity being C are measured; and (3), the single batteries with C1 being 1.03-1.07 times C and the constant current charge ratio being 94-98% are screened from the multiplesingle batteries with the rated capacity being C to be denoted as the primary screening batteries, the screening ranges of r and U2 of the primary screening batteries are calculated, the screening range of K is limited, and then the batteries with the r, U2 and K value in the screening ranges are screened. Through the screening and grouping methods, the consistency of the battery pack obtained through screening and grouping is good.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery sorting, in particular to a screening method and a matching method for improving the consistency of ternary lithium-ion battery packs. Background technique [0002] With the increasing demand for cruising range of electric vehicles, ternary lithium-ion power batteries with high energy density have gradually become a market development trend. In order to meet certain energy and power requirements, vehicle power battery systems are often composed of dozens, hundreds, or even thousands of single cells connected in series and parallel, and the consistency of the single cells directly determines the performance of the final battery pack. , life and safety. [0003] The consistency of battery cells is mainly determined by three aspects: raw materials, manufacturing process and use process. There are too many factors and links involved in the raw materials and production process. On the who...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344B07C5/38
Inventor 冯德圣郭福领张宏立陈炜
Owner 合肥国轩电池有限公司