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Lithium-ion battery short circuit test method

A lithium-ion battery and short-circuit testing technology, which is applied in short-circuit testing, discharge tube testing, and dielectric strength testing, can solve problems such as analysis and failure to perform root causes, and achieve low cost, quantitative analysis, and simple and convenient operation Effect

Active Publication Date: 2022-08-09
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a short-circuit test method for lithium-ion batteries, aiming to solve the problems of short-circuit or micro-short-circuit in existing lithium-ion batteries, which can only be judged for short-circuit or micro-short-circuit but cannot be analyzed for root causes.

Method used

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  • Lithium-ion battery short circuit test method

Examples

Experimental program
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Effect test

Embodiment 1

[0091] A method for short-circuit testing of lithium-ion batteries, comprising the following steps:

[0092] (1) Disassemble the cells with micro-short circuits and use a magnifying glass to find suspicious black spots on the diaphragm;

[0093] (2). Place the diaphragm with suspicious black spots in an oven at 45°C for 10 minutes, and then cool down to room temperature naturally after drying, and then refer to figure 2 As shown in the test schematic diagram, the drying membrane is laid flat on a clean and dry copper foil, and the surface of the drying membrane with suspicious black spots is facing up;

[0094] (3). Use copper foil to make a flat and flexible copper tube at one end;

[0095] (4). Connect one end of the Hi-pot tester to the copper tube and the other end to the copper foil. After adjusting the voltage of the Hi-pot tester to 40V, use the flat end of the copper tube to contact the suspected black spot of the drying diaphragm, and connect the Hi-pot tester to th...

Embodiment 2

[0107] A method for short-circuit testing of lithium-ion batteries, comprising the following steps:

[0108] (1) Disassemble the cells with micro-short circuits and use a magnifying glass to find suspicious black spots on the diaphragm;

[0109] (2). Place the diaphragm with suspicious black spots in an oven at 30°C for 15 minutes, and then cool down to room temperature naturally after drying, and then refer to figure 2 As shown in the test schematic diagram, the drying membrane is laid flat on a clean and dry iron plate, and the surface of the drying membrane with suspicious black spots is facing upward;

[0110] (3). Use copper foil to make a flat and flexible copper tube at one end;

[0111] (4). Connect one end of the Hi-pot tester to the copper tube and the other end to the iron plate. After adjusting the voltage of the Hi-pot tester to 30V, use the flat end of the copper tube to contact the suspected black spot of the drying diaphragm, and connect the Hi-pot tester to ...

Embodiment 3

[0123] A method for short-circuit testing of lithium-ion batteries, comprising the following steps:

[0124] (1) Disassemble the cells with micro-short circuits and use a magnifying glass to find suspicious black spots on the diaphragm;

[0125] (2). Put the diaphragm with suspicious black spots in an oven at 60°C for 8 minutes, and then cool down to room temperature naturally after drying, and then refer to figure 2 As shown in the test schematic diagram, the dry diaphragm is laid flat on a clean and dry graphite plate, and the surface of the dry diaphragm with suspicious black spots is facing up;

[0126] (3). Use copper foil to make a flat and flexible copper tube at one end;

[0127] (4). Connect one end of the Hi-pot tester to the copper tube and the other end to the graphite plate. After adjusting the voltage of the Hi-pot tester to 20V, use the flat end of the copper tube to contact the suspected black spot of the drying diaphragm, and connect the Hi-pot tester to 20V...

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Abstract

The invention relates to the technical field of lithium ion battery detection, and in particular provides a method for short circuit testing of lithium ion batteries. The method includes: obtaining a separator from a short-circuited or micro-short-circuited cell and drying it to obtain a dry separator; finding suspicious spots on the dry separator; laying the dry separator with suspicious spots on the surface of the conductor to ensure that the dry separator is compatible with the The conductor is in good contact and the surface with suspicious points is facing upward; use the testing equipment to test the current value of the dry diaphragm placed on the surface of the conductor, and measure the current value at the non-suspicious point of the dry diaphragm, denoted as I R ; measure the current value at the suspicious point of the drying diaphragm, denoted as I W ;if I W >I R , then judge the suspicious point as a short-circuit or micro-short-circuit point; if I W =I R , the suspicious point is judged as a non-short-circuit or non-micro-short-circuit point. The invention can effectively perform qualitative and quantitative analysis on the short-circuit or micro-short-circuit cell, so as to find the root cause of the short-circuit or micro-short circuit.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery detection, in particular to a method for short circuit testing of lithium ion batteries. Background technique [0002] In the production process of lithium-ion batteries, impurities are often introduced into the cells due to the purity of raw materials and processing technology. During the formation or use of the battery, it is deposited on the surface of the positive and negative electrodes due to electrochemical reactions and other reasons, resulting in damage to the cell separator and causing short circuits or micro-short circuits. If there is a short circuit, it will be scrapped directly, and if there is a micro short circuit, because it cannot be quickly screened, the flow of such micro short circuit cells into the market will cause the service life of the battery cells to be lower than that of conventional cells, and reduce the battery cell manufacturers. business reputation. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G01R31/385G01R31/24G01R31/12
CPCG01R31/52G01R31/385G01R31/24G01R31/1263Y02P70/50
Inventor 马汝甲魏臻徐中领张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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