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

A sorting method for self-discharge performance of high-capacity lithium batteries

A lithium battery, self-discharge technology, applied in the direction of secondary battery charging/discharging, secondary battery, electrolyte battery manufacturing, etc. The effect of strong economy and operability, excellent cycle performance

Active Publication Date: 2022-02-22
HENAN FUSEN NEW ENERGY TECH
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above sorting method can sort out the self-discharge performance of lithium batteries within a certain period of time, but there are defects that some bad batteries with large self-discharge cannot be screened out in time, resulting in poor voltage consistency of lithium batteries

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 sorting method for self-discharge performance of high-capacity lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A sorting method for the self-discharge performance of high-capacity lithium batteries, comprising the following steps:

[0032] (1) Take the high-capacity lithium battery after 2 days of aging at a high temperature of 45°C after liquid injection;

[0033] (2) Formation steps: Step 1: Use 0.05C constant current to charge for 90 minutes; Step 2: Use 0.1C constant current to charge for 90 minutes; Step 3: Use 0.3C constant current to form an upper limit protection voltage of 4.3V, cut-off current 0.01C;

[0034] (3) Then use a tester with an accuracy of 0.0001V voltage accuracy to test OCV1, put it aside for 3 days at a high temperature of 40°C to 45°C, and then place it at room temperature for 12 hours, then test OCV2; filter out self-discharge by calculating the difference between OCV1-OCV2 Less than 50mv and greater than 65mv, the battery has a large difference;

[0035] (4) Capacity division steps: ①0.5C constant current discharge 2.75V; ②0.5C constant current const...

Embodiment 2

[0039] A sorting method for the self-discharge performance of high-capacity lithium batteries, comprising the following steps:

[0040] (1) Take the high-capacity lithium battery after 2 days of aging at a high temperature of 45°C after liquid injection;

[0041] (2) Formation steps: Step 1: Use 0.05C constant current to charge for 90 minutes; Step 2: Use 0.1C constant current to charge for 90 minutes; Step 3: Use 0.3C constant current to form an upper limit protection voltage of 4.3V, cut-off current 0.01C;

[0042] (3) Then use a tester with an accuracy of 0.0001V voltage accuracy to test OCV1, put it aside for 3 days at a high temperature of 40°C to 45°C, and then place it at room temperature for 12 hours, then test OCV2; filter out self-discharge by calculating the difference between OCV1-OCV2 Less than 50mv and greater than 65mv, the battery has a large difference;

[0043] (4) Capacity division steps: ①0.5C constant current discharge 2.75V; ②0.5C constant current constan...

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 provides a method for sorting the self-discharge performance of high-capacity lithium batteries, which belongs to the technical field of lithium ion batteries, and comprises the following steps: take the lithium batteries that have been aged for 2 days at a high temperature of 45°C after liquid injection, and use 0.05C to 0.1 C constant current charging for 90 minutes; use 0.1 ~ 0.2C constant current charging for 90 minutes; use 0.3C constant current and constant voltage formation, upper limit protection voltage 4.3V, cut-off current 0.01C; then use a tester with an accuracy of 0.0001V voltage accuracy for testing OCV1, put it on hold for 3 days at a high temperature of 40°C-45°C, then place it at room temperature for 12 hours, and then test OCV2; by calculating the difference between OCV1‑OCV2, the battery with a large difference in self-discharge is screened; according to the conventional 0.5C charge and discharge detection capacity of lithium batteries , Charge at 0.5C constant current for 60 minutes and limit the voltage to 4.2V to test OCV3 in the cabinet, leave it at room temperature for 7 days to test OCV4, and the battery is qualified if the difference between OCV3‑OCV4 is controlled within ≤9mv through settlement again. The lithium battery produced by the invention can reduce the number of secondary capacity-divided batteries, and at the same time improve the consistency and safety of subsequent lithium batteries used in groups.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for sorting the self-discharge performance of high-capacity lithium batteries with high economical usability and safety. Background technique [0002] At present, compared with nickel-hydrogen and nickel-cadmium batteries, lithium-ion batteries are in the leading position in the 3C (computer, communication, consumer electronics) field with absolute advantages; at the same time, in order to meet the requirements of energy conservation and environmental protection, electric vehicles (including electric bicycles and electric vehicles) Automobile) has a broad market prospect. As a power source for electric vehicles, lithium-ion batteries are very competitive. Regardless of the 3C electronic consumer field or the electric vehicle application field, due to the high requirements for power supply energy, batteries must be used in parallel and in series...

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): H01M10/44H01M10/058B07C5/344
CPCH01M10/446H01M10/058B07C5/344Y02E60/10Y02P70/50
Inventor 曹长城曹成群张晓伟唐正果王改香
Owner HENAN FUSEN NEW ENERGY TECH