A dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries

Abstract

This invention discloses a dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries, comprising: a carrier gas source, the outlet of which is connected to the inlet of a first mass flow controller via a first carrier gas path, the outlet of the first mass flow controller being connected to a battery mold, and the outlet of the battery mold being connected to the inlet of a condenser via a first pipeline; the outlet of the carrier gas source being connected to the inlet of a second mass flow controller via a second carrier gas path, the outlet of the second mass flow controller being connected to the inlet of the condenser via a second pipeline; and the outlet of the condenser being connected to the mass spectrometer via a third pipeline. This invention utilizes two carrier gas paths in synergy: one path is introduced into the battery mold at a lower flow rate to reduce electrolyte evaporation, enabling continuous real-time monitoring of battery charge and discharge for over 72 hours; the other path merges with the gas discharged from the battery, serving as a supplementary driving gas at a higher flow rate to meet the sample introduction requirements of the mass spectrometer.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical equipment manufacturing, specifically to a dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries. Background Technology

[0002] In-situ differential electrochemical mass spectrometry (DEMS) is used in battery research for real-time detection of gas generated by electrochemical reactions. However, traditional single-carrier gas systems present a dilemma: high carrier gas flow rates lead to significant electrolyte evaporation within the battery mold, affecting battery performance and detection accuracy, and making it difficult to support long-term (e.g., over 72 hours) continuous monitoring; low flow rates, on the other hand, fail to meet the sample introduction requirements of the mass spectrometer, resulting in low detection sensitivity. Therefore, a carrier gas system that balances electrolyte evaporation suppression with mass spectrometry sample introduction requirements is urgently needed. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide a dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries.

[0004] A dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries includes:

[0005] At least one gas source,

[0006] The outlet of the carrier gas source is connected to the inlet of the first mass flow controller through the first carrier gas path, and the outlet of the first mass flow controller is connected to the battery mold.

[0007] The air outlet of the battery mold is connected to the air inlet of the condensation device through a first pipe;

[0008] The outlet of the carrier gas source is connected to the inlet of the second mass flow controller through the second carrier gas path, and the outlet of the second mass flow controller is connected to the inlet of the condensing device through the second pipeline.

[0009] The outlet of the condenser is connected to the mass spectrometer via a third pipeline.

[0010] In a preferred embodiment of the present invention, the first mass flow controller controls the carrier gas flow rate to be 0.04-2 mL / min.

[0011] In a preferred embodiment of the present invention, the second mass flow controller controls the carrier gas flow rate to be 0.2-10 mL / min.

[0012] In a preferred embodiment of this utility model, the gas in the carrier gas source is an inert gas.

[0013] The inert gas is preferably nitrogen, helium, or argon.

[0014] In a preferred embodiment of this utility model, the condensing device is a condensing device with a U-shaped condensing tube, the two ends of which are the air inlet and air outlet of the condensing device, respectively, and the outer part or all of the U-shaped condensing tube is immersed in the condensing substance.

[0015] In a preferred embodiment of this invention, the condensing substance is a commercially available condensing substance.

[0016] A detection method for a dual-carrier gas flow path system of a battery using in-situ differential electrochemical mass spectrometry (DEMS) includes the following steps:

[0017] Step 1: Turn on the carrier gas source, set the flow rate of the first mass flow controller to 0.04-2 mL / min and the flow rate of the second mass flow controller to 0.2-10 mL / min, and the first mass flow controller controls the carrier gas to enter the battery mold at a small flow rate;

[0018] Step 2: An electrochemical reaction occurs inside the battery mold, and the generated gas is discharged from the gas outlet of the battery mold. It merges with the carrier gas flowing out from the second mass flow controller at the gas inlet of the condenser to form supplementary power gas.

[0019] Step 3: The combined gases enter the condensation device, and after condensation, they are detected by a mass spectrometer.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention utilizes a dual-carrier gas system. One gas is introduced into the battery mold at a low flow rate of 0.04-2 mL / min to reduce electrolyte evaporation, enabling continuous real-time monitoring of the battery during long-term charge-discharge cycles exceeding 72 hours. The other gas, combined with the gas discharged from the battery, serves as a supplementary driving gas at a higher flow rate of 0.2-10 mL / min to meet the sample introduction requirements of the mass spectrometer. This dual-carrier gas structure enhances system sensitivity, while optimized gas paths ensure stable and adjustable gas flow. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] like Figure 1 The illustrated dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries includes a carrier gas source 100, wherein the gas in the carrier gas source 100 is an inert gas. The inert gas can be any of nitrogen, helium, neon, argon, krypton, or xenon. In this embodiment, argon is used.

[0026] The inert gas can be selected according to the battery testing system and is not limited to the specific selection in this embodiment.

[0027] The outlet of the carrier gas source 100 is connected to the inlet of the first mass flow controller 200 through the first carrier gas passage 101, and the outlet of the first mass flow controller 200 is connected to the battery mold 300.

[0028] The air outlet of the battery mold 300 is connected to the air inlet of the condensation device 400 through the first pipe 102.

[0029] The first mass flow controller 200 controls the carrier gas flow rate to be 0.04-2 mL / min. This setting is to use the carrier gas in the first carrier gas path 101 to suppress the evaporation of electrolyte in the battery mold 300 and support continuous real-time monitoring of the battery mold 300 for more than 72 hours of long-term charging and discharging.

[0030] The outlet of the carrier gas source 100 is connected to the inlet of the second mass flow controller 500 through the second carrier gas passage 103. The outlet of the second mass flow controller 500 is connected to the inlet of the condenser 400 through the second pipeline 104. The outlet of the condenser 400 is connected to the mass spectrometer 600 through the third pipeline 105.

[0031] The condensing device 400 is a condensing device 400 with a U-shaped condenser tube 410. The two ends of the U-shaped condenser tube 410 are the air inlet and air outlet of the condensing device 400, respectively. The outer part or all of the U-shaped condenser tube 410 is immersed in the condensing substance. The condensing substance is a commercially available condensing substance. The commercially available condensing substance can be dry ice.

[0032] The condenser 400 can be equipped with a condensate inlet and outlet as needed, and can be connected to an external condensate supply pipeline or recovery pipeline.

[0033] The second mass flow controller 500 controls the carrier gas flow rate in the range of 0.2-10 mL / min. After merging with the gas discharged from the battery mold 300, it provides power and flow to enter the mass spectrometer 600, meeting the sample injection requirements of the mass spectrometer 600.

[0034] A detection method for a dual-carrier gas flow path system of a battery using in-situ differential electrochemical mass spectrometry (DEMS) includes the following steps:

[0035] Step 1: Turn on the carrier gas source, set the flow rate of the first mass flow controller to 0.04-2 mL / min and the flow rate of the second mass flow controller to 0.2-10 mL / min, and the first mass flow controller controls the carrier gas to enter the battery mold at a small flow rate;

[0036] Step 2: An electrochemical reaction occurs inside the battery mold, and the generated gas is discharged from the gas outlet of the battery mold. It merges with the carrier gas flowing out from the second mass flow controller at the gas inlet of the condenser to form supplementary power gas.

[0037] Step 3: The combined gases enter the condensation device, and after condensation, they are detected by a mass spectrometer.

[0038] Because of the above structure, the working steps of this utility model are as follows:

[0039] Step 1: Turn on the carrier gas source, set the flow rate of the first mass flow controller (MFC1) to 0.04-2 mL / min and the flow rate of the second mass flow controller (MFC2) to 0.2-10 mL / min. The first mass flow controller controls the carrier gas to enter the battery mold at a small flow rate.

[0040] Step 2: An electrochemical reaction occurs inside the battery mold (Cell), and the generated gas is discharged from the gas outlet of the battery mold (Cell) and merges with the carrier gas flowing out from the second mass flow controller (MFC2) at the gas inlet of the condenser to form supplementary power gas;

[0041] Step 3: The combined gases enter the condenser and are then condensed before being detected by a mass spectrometer (MS).

[0042] Unlike existing technologies, the dual carrier gas design of this invention uses a low-flow-rate carrier gas to suppress electrolyte evaporation and support long-term monitoring; the high-flow-rate carrier gas merges with the reactant gas to meet mass spectrometry sample introduction requirements and improve the sensitivity of the mass spectrometry system for sample introduction and detection.

[0043] Optimized gas path ensures stable and adjustable airflow, while condensation device further reduces interference, significantly improving the accuracy and stability of in-situ differential electrochemical mass spectrometry (DEMS) detection.

[0044] The above shows and describes the basic principles, main features, and advantages of this utility model.

[0045] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. A dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries, characterized in that, include: At least one gas source, The outlet of the carrier gas source is connected to the inlet of the first mass flow controller through the first carrier gas path, and the outlet of the first mass flow controller is connected to the battery mold. The air outlet of the battery mold is connected to the air inlet of the condensation device through a first pipe; The outlet of the carrier gas source is connected to the inlet of the second mass flow controller through the second carrier gas path, and the outlet of the second mass flow controller is connected to the inlet of the condensing device through the second pipeline. The outlet of the condenser is connected to the mass spectrometer via a third pipeline.

2. The dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries as described in claim 1, characterized in that, The first mass flow controller controls the carrier gas flow rate to be 0.04-2 mL / min.

3. The dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries as described in claim 1, characterized in that, The second mass flow controller controls the carrier gas flow rate to be 0.2-10 mL / min.

4. The dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries as described in claim 1, characterized in that, The gas in the carrier gas source is an inert gas.

5. The dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries as described in claim 1, characterized in that, The condensing device is a condensing device with a U-shaped condenser tube. The two ends of the U-shaped condenser tube are the air inlet and air outlet of the condensing device, respectively. The outer part or the entire outer part of the U-shaped condenser tube is immersed in the condensing substance.

6. The dual-carrier gas flow path system for in-situ differential electrochemical mass spectrometry (DEMS) detection of batteries as described in claim 5, characterized in that, The condensing substance is a commercially available condensing substance.

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