Leak-proof in-situ soft package DEMS test mold

Abstract

The utility model discloses a leakproof in-situ soft package DEMS test mould, and relates to the technical field of test moulds, the leakproof in-situ soft package DEMS test mould comprises a soft package battery carrier, the soft package battery carrier is provided with a soft package battery, an air inlet I, an air inlet II, an air outlet I and an air outlet II, and the air outlet I is provided with a PTFE permeable membrane and a pipeline screw; the soft package battery carrier is made of alloy with good leakproof performance, a plurality of mounting holes are formed in the soft package battery carrier, and the air inlet I and the air inlet II are symmetrically arranged. A layer of PTFE fluid valve is designed at the outlet of the DEMS test soft package battery mould, so that electrolyte is prevented from directly entering a mass spectrum along with carrier gas to damage an instrument, and the reliability of the DEMS test soft package battery mould is improved. Compared with an existing soft package battery mold for DEMS testing, a set of polytetrafluoroethylene fluid valve is designed at an outlet of the soft package battery mold, electrolyte and produced gas can be effectively separated, and electrode liquid is prevented from entering the DEMS, so that the DEMS is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of test molds, in particular to a leak-proof in-situ soft-package DEMS test mold. Background Art

[0002] In an era of rapid development of science and technology and continuous technological updates, consumer electronics, electric vehicles, rail transit, flexible electronic devices, robots, energy storage grids, and even aerospace, which are related to national security, are developing rapidly, and the urgent demand for high-performance batteries is becoming more and more intense. Although different application fields have different specific requirements for battery performance, the development of high-energy-density and high-safety batteries is an important direction for current battery research and development. In terms of energy density, in order to get rid of the "mileage anxiety" caused by the limited capacity of lithium-ion batteries and achieve the indicator of high energy density, on the one hand, domestic and foreign countries have invested a lot of energy in research on breaking through the extreme energy density and power density of the existing system; on the other hand, in order to develop batteries with higher energy density, from the perspective of thermodynamic calculations, researchers are working hard to develop a new battery system-lithium metal battery system.

[0003] In the past few decades, the development and application of advanced in situ characterization tools have promoted researchers' understanding of the internal operating mechanism of anode-free lithium metal batteries (AFLMBs) during charging and discharging. However, in this system, the electrolyte is prone to decomposition and produces SEI film (formed by the deposition of inorganic lithium salt Li2CO3 and organic lithium salt ROCO2Li) and gas (CO, olefins, alkanes). In addition, since the formed SEI film is unevenly distributed and loose, it cannot completely prevent the contact between the active material and the electrolyte. Therefore, the active material can continuously catalyze the reduction and decomposition of the electrolyte, resulting in continuous gas production during charging and discharging. In order to deeply understand the internal operating mechanism of lithium metal batteries during charging and discharging, it becomes particularly important to monitor and analyze the gas production components of the battery.

[0004] Differential electrochemical mass spectrometry (DEMS) is a modern electrochemical in-situ testing method developed by combining mass spectrometry and electrochemistry. DEMS can qualitatively and quantitatively analyze the gases generated or consumed by the battery during the charge and discharge process. It is an effective method to study the internal gas generation mechanism of the battery, SEI film formation, electrolyte and electrode stability, cycle life and irreversible capacity.

[0005] In the process of using DEMS to detect and analyze the gas production components of the battery, it is strictly forbidden for the electrolyte in the tested battery to enter the DEMS with the carrier gas, otherwise the DEMS will be damaged. At present, when performing differential electrochemical mass spectrometry detection on soft-pack batteries, in order to detect the gas production of the battery, it is necessary to poke holes or cut the aluminum-plastic film of the soft-pack battery, and then the gas production of the battery, driven by the carrier gas (Ar), enters the DEMS through the outlet of the soft-pack battery mold for monitoring and analysis. In this process, the electrode liquid in the soft-pack battery will also enter the DEMS through the outlet of the soft-pack battery mold with the carrier gas. To address this problem, the current measure is to install a U-shaped tube with a condensation effect between the soft-pack battery mold and the DEMS, so that the electrode liquid in the carrier gas is condensed when passing through the U-shaped tube, preventing it from directly entering the DEMS. However, in response to the situation where a large amount of electrolyte escapes from the soft-pack battery cell, the U-shaped tube condensation method often blocks the pipeline due to excessive electrolyte condensation, causing the test to be interrupted.

[0006] In view of the above problems, the present application designs a leak-proof in-situ soft-pack DEMS test mold to prevent the electrolyte from entering the mass spectrometer and damaging the instrument. Utility Model Content

[0007] The utility model aims to provide a leak-proof in-situ soft-package DEMS test mold, thereby solving the existing problems.

[0008] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0009] The utility model is a leak-proof in-situ soft-pack DEMS test mold, comprising a soft-pack battery carrier, on which a soft-pack battery, an air inlet 1, an air inlet 2, an air outlet 1, and an air outlet 2 are arranged, and a PTFE permeable membrane and a pipeline screw are arranged on the air outlet 1.

[0010] Furthermore, the material of the soft-pack battery carrier is an alloy with good anti-leakage performance, and a plurality of mounting holes are provided on the soft-pack battery carrier, so that the soft-pack battery carrier can effectively fix the soft-pack battery.

[0011] Furthermore, the air inlet one and the air inlet two are arranged in a symmetrical state, and the air inlet one and the air inlet two are arranged on both sides of the lower end of the soft-pack battery carrier. The air inlet one and the air inlet two can allow external gas to enter the interior of the soft-pack battery carrier.

[0012] Furthermore, the gas outlet one and the gas outlet two are arranged in a symmetrical state, and the gas outlet one and the gas outlet two are arranged on both sides of the upper end of the soft-pack battery carrier, and the gas outlet one and the gas outlet two can allow the gas in the soft-pack battery carrier to be discharged.

[0013] Furthermore, the material of the PTFE permeable membrane is a material formed by coating polytetrafluoroethylene resin on ultra-fine glass fiber fabric. The PTFE permeable membrane is light in weight and has a long service life.

[0014] Furthermore, the size of the pipeline screw is one to sixteen, and the pipeline screw can be effectively fixed on the air outlet one.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model designs a layer of PTFE fluid valve at the outlet of the DEMS test soft-pack battery mold to prevent the electrolyte from directly entering the mass spectrometer along with the carrier gas and damaging the instrument. Compared with the current DEMS test soft-pack battery mold, a set of polytetrafluoroethylene fluid valves is designed at the outlet of the soft-pack battery mold, which can effectively separate the electrolyte and the gas production, inhibit the electrode liquid from entering the DEMS, and thus protect the DEMS.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the planar appearance structure of the utility model;

[0020] Figure 2 It is a schematic diagram of a partially enlarged planar structure of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Soft-pack battery carrier; 2. Soft-pack battery; 3. Air inlet 1; 4. Air inlet 2; 5. Air outlet 1; 6. Air outlet 2; 7. PTFE permeable membrane; 8. Pipe screws. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-2 The utility model is a leak-proof in-situ soft-pack DEMS test mold, including a soft-pack battery carrier 1, on which a soft-pack battery 2, an air inlet 1 3, an air inlet 2 4, an air outlet 1 5, and an air outlet 2 6 are arranged, and a PTFE permeable membrane 7 and a pipeline screw 8 are arranged on the air outlet 1 5.

[0025] The material of the soft-pack battery carrier 1 is an alloy with good anti-leakage performance. A plurality of mounting holes are provided on the soft-pack battery carrier 1 , and the soft-pack battery carrier 1 can effectively fix the soft-pack battery.

[0026] The air inlet 1 3 and the air inlet 2 4 are arranged in a symmetrical state. The air inlet 1 3 and the air inlet 2 4 are arranged on both sides of the lower end of the soft-pack battery carrier 1. The air inlet 1 3 and the air inlet 2 4 can allow external gas to enter the interior of the soft-pack battery carrier 1.

[0027] The gas outlet 1 5 and the gas outlet 2 6 are symmetrically arranged at both sides of the upper end of the soft-pack battery carrier 1 , and the gas outlet 1 5 and the gas outlet 2 6 can allow the gas in the soft-pack battery carrier 1 to be discharged.

[0028] The material of the PTFE permeable membrane 7 is a material obtained by coating polytetrafluoroethylene resin on ultra-fine glass fiber fabric. The PTFE permeable membrane 7 is light in weight and has a long service life.

[0029] The size of the pipeline screw 8 is one to sixteen, and the pipeline screw 8 can be effectively fixed on the air outlet 1 5 .

[0030] The utility model designs a layer of PTFE fluid valve at the outlet of the DEMS test soft-pack battery mold to prevent the electrolyte from directly entering the mass spectrometer along with the carrier gas and damaging the instrument. Compared with the current soft-pack battery mold for DEMS test, a set of polytetrafluoroethylene fluid valves is designed at the outlet of the soft-pack battery mold, which can effectively separate the electrolyte and the gas production and inhibit the electrode liquid from entering the interior of the DEMS, thereby protecting the DEMS.

[0031] A specific application of this embodiment is: during testing, it utilizes the super chemical stability of the PTFE membrane itself, is not corroded by the electrolyte, and maintains the stability of the PTFE fluid valve structure. At the same time, the adjustability of the pore size of the PTFE membrane is utilized to regulate the flow rate of the gas, and the electrolyte and the gas production mixed in the carrier gas are separated, that is, the gas production is allowed to pass through, while preventing the electrolyte from entering the mass spectrometer. By designing a layer of PTFE fluid valve at the outlet of the DEMS test soft-pack battery mold, the electrolyte is prevented from directly entering the mass spectrometer with the carrier gas and damaging the instrument. Compared with the current soft-pack battery mold for DEMS testing, a set of polytetrafluoroethylene fluid valves are designed at the outlet of the soft-pack battery mold, which can effectively separate the electrolyte and the gas production, and inhibit the electrode liquid from entering the DEMS interior, thereby protecting the DEMS.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A leak-proof in-situ soft-pack DEMS test mold, comprising a soft-pack battery carrier (1), characterized in that: The soft-pack battery carrier (1) is provided with a soft-pack battery (2), an air inlet 1 (3), an air inlet 2 (4), an air outlet 1 (5), and an air outlet 2 (6); the air outlet 1 (5) is provided with a PTFE permeable membrane (7) and a pipeline screw (8).

2. The leak-proof in-situ soft-pack DEMS test mold according to claim 1, characterized in that: The material of the soft-pack battery carrier (1) is an alloy with good anti-leakage performance, and a plurality of mounting holes are provided on the soft-pack battery carrier (1).

3. The leak-proof in-situ soft-pack DEMS test mold according to claim 2, characterized in that: The air inlet one (3) and the air inlet two (4) are arranged in a symmetrical state, and the air inlet one (3) and the air inlet two (4) are arranged on both sides of the lower end of the soft-pack battery carrier (1).

4. The leak-proof in-situ soft-pack DEMS test mold according to claim 3, characterized in that: The first gas outlet (5) and the second gas outlet (6) are arranged in a symmetrical state, and the first gas outlet (5) and the second gas outlet (6) are arranged on both sides of the upper end of the soft-pack battery carrier (1).

5. The leak-proof in-situ soft-pack DEMS test mold according to claim 4, characterized in that: The material of the PTFE permeable membrane (7) is a material obtained by coating polytetrafluoroethylene resin on ultra-fine glass fiber fabric.

6. The leak-proof in-situ soft-pack DEMS test mold according to claim 5, characterized in that: The size of the pipeline screw (8) is one to sixteen.

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