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, qualitative analysis, and simple and convenient operation Effect

Active Publication Date: 2020-09-25
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 lithium-ion battery short circuit test, comprising the following steps:

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

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

[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 touch the suspicious black spot on the dry diaphragm, and place the Hi-pot The current value I displayed by t...

Embodiment 2

[0107] A method for lithium-ion battery short circuit test, comprising the following steps:

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

[0109] (2). Put the diaphragm with suspicious black spots in an oven at 30°C for 15 minutes, then cool down to room temperature naturally after drying, and then refer to figure 2 As shown in the schematic diagram of the test, the dry diaphragm is spread on a clean and dry iron plate, and the surface of the dry diaphragm with suspicious black spots faces 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 pipe 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 pipe to touch the suspicious black spot on the dry diaphragm, and place the Hi-pot The current value I displayed by t...

Embodiment 3

[0123] A method for lithium-ion battery short circuit test, comprising the following steps:

[0124] (1). Disassemble the cell with micro-short circuit 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 cool down to room temperature naturally after drying, and then refer to figure 2 As shown in the schematic diagram of the test, the dry diaphragm is spread flat on a clean and dry graphite plate, and the surface of the dry diaphragm with suspicious black spots faces upward;

[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 touch the suspicious black spot on the dry diaphragm, and place the Hi-pot The current value I dis...

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PUM

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Abstract

The invention relates to the technical field of lithium ion battery detection, and particularly provides a lithium ion battery short-circuit test method. The method comprises the following steps: obtaining a diaphragm from a short-circuited or micro-short-circuited battery cell and carrying out drying treatment to obtain a dried diaphragm; finding a suspicious point on the dry diaphragm; paving the dry diaphragm with the suspicious points on the surface of the conductor to ensure that the dry diaphragm is in good contact with the conductor and the surface with the suspicious points faces upwards; testing the current value of the dry diaphragm on the surface of the conductor by using detection equipment, measuring the current value at a non-suspicious point of the dry diaphragm, and recording the current value as IR; measuring a current value of the dry diaphragm with a suspicious point, and recording the current value as IW; if IW is greater than IR, judging that the suspicious point is a short-circuit point or a micro short-circuit point; and if IW is equal to IR, judging that the suspicious point is a non-short-circuit point or a non-micro-short-circuit point. According to the method, qualitative and quantitative analysis can be effectively carried out on the short-circuit or micro-short-circuit battery cell, so that the root cause of the short circuit or micro-short circuitcan be found.

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 easily introduced into the batteries due to problems such as raw material purity 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 a short circuit or a micro short circuit. 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 introduction of this micro-short-circuit cell into the market will cause the service life of the cell to be lower than that of conventional cells, and reduce the cost of cell manufacturers. bus...

Claims

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Application Information

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Patent Type & Authority Applications(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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