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Method for measuring gas volume in battery, device and application thereof

A technology of internal gas and battery area, applied in measuring devices, volume measuring instruments/methods, measuring capacity, etc., which can solve the problems of undetectable initial internal gas, undetectable gas distribution, poor sensitivity to trace gas, etc.

Active Publication Date: 2019-04-19
无锡领声科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not sensitive to trace gases, and it is limited to the analysis of newly generated gases during battery use. It cannot detect the initial internal gas caused by battery filling defects, nor can it detect gas distribution.

Method used

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  • Method for measuring gas volume in battery, device and application thereof
  • Method for measuring gas volume in battery, device and application thereof
  • Method for measuring gas volume in battery, device and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Measure the internal gas volume of the lithium iron phosphate-graphite soft-pack lithium-ion battery with a size of 70mm×80mm×3.2mm.

[0058] Make 10 lithium iron phosphate-graphite soft pack lithium-ion batteries of the same size and type. This type of battery normally requires 4.25mL of electrolyte to ensure sufficient infiltration. During the production process, the amount of electrolyte was deliberately controlled to be 4.25, 4.20, 4.15, 4.10, 4.05, 4.00, 3.95, 3.90, 3.85, 3.80mL, and the corresponding V j 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45 mL, respectively.

[0059] Divide each battery into 35×40 small square areas of 2mm×2mm along the largest surface, actually the cross section is 4mm 2 A small rectangular body of 35×40, a cross-sectional area of ​​the small rectangular body A=4mm 2 .

[0060] The ultrasonic transducers are a pair of focused ultrasonic transducers with a frequency of 0.5MHz, a diameter of 1.0cm, and a focal length of 2cm. ...

Embodiment 2

[0067] Monitor the internal lithium analysis process of lithium iron phosphate-graphite soft-pack lithium-ion battery with a size of 70mm×80mm×3.2mm.

[0068] Make a normal battery of this type, charge and discharge at minus 20°C with a current of 6A, and at the same time conduct ultrasonic scanning with the method described in Example 1, and judge the internal gas volume and distribution of the battery. It can be found that there is no gas inside the battery in the initial state, and the ultrasonic transmission signal intensity in each area is uniform. After 3 cycles, the total amount of internal gas was measured to be 21 μL, and it was mainly distributed in the middle part of the two tabs of the battery. It is judged that this part of the gas is accompanied by the process of lithium analysis. After 10 cycles, the total amount of gas increased to 35 μL, indicating that the amount of lithium precipitated increased.

[0069] The present invention also provides a device for re...

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Abstract

The invention discloses a method for measuring gas volume in a battery, a device and application thereof, wherein the method, the device and the application thereof belong to the field of lithium ionbattery testing. The battery is a rectangular hard-housing battery or a rectangular soft packaging battery. The largest-areas surface of the battery is called as a battery plane. Along the battery plane, the battery is divided into n areas of which the areas are A respectively. A transmission ultrasonic signal strength without a gas gap is recorded as T0, and a transmission ultrasonic signal strength of an i-th area of a to-be-tested battery with unknown inner gas volume Vi is recorded as Ti. The value of lg(T0 / Ti) is calculated. A local gas volume Vi of each area in the battery plane is obtained according to a proportional relation between the local gas volume Vi and lg(T0 / T) of the battery in the i-th area which is penetrated by ultrasonic sound. Then all Vis are added for obtaining thetotal inner gas volume V of the battery. The method and the device have advantages of no loss, quantifiability and imageability.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery detection, and more specifically relates to a detection method, device and application of the internal gas volume of a lithium-ion battery. Background technique [0002] Lithium-ion batteries are currently the most widely used electrochemical energy storage devices. They are composed of positive electrode materials, separators, negative electrode materials, electrolytes, positive electrode current collectors, negative electrode current collectors, etc. , steel shell and other airtight containers. The gap between the positive electrode material, separator, and negative electrode material of the lithium-ion battery needs to be infiltrated by the electrolyte to achieve ion conduction. [0003] However, due to defects in the manufacturing process and the occurrence of side reactions, there may be gas filling the gaps between the positive electrode material, separator, and negative electrode materia...

Claims

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Application Information

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IPC IPC(8): G01F22/00G01N29/032
CPCG01F22/00G01N29/032
Inventor 沈越黄云辉
Owner 无锡领声科技有限公司
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