In-situ gas path detection equipment for gas production of battery

Abstract

The utility model relates to the technical field of battery detection, in particular to an in-situ gas path detection device for gas production of batteries, which comprises a base, a gas inlet head is arranged at the upper end of the base, a three-way connector is fixedly mounted on the gas inlet head, and a baseline gas path pipeline is fixedly mounted at one end of the three-way connector. A first flow calculator is fixedly installed on the section, away from the three-way connector, of the base line gas circuit pipeline, the other end of the three-way connector is fixedly connected with a testing gas circuit pipeline, and a second flow calculator is fixedly connected to the end, away from the three-way connector, of the testing gas circuit pipeline. According to the utility model, argon is introduced to control the flow of argon in the first flow calculator through the first flow calculator and the first manual gas path valve fixedly connected with the front end, and gas in the test gas path pipeline is rapidly brought out, so that the volatilization of electrolyte in the battery mold is reduced, the stability of a mass spectrum baseline is improved, and the quality of the battery mold is ensured. The test precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to an in-situ gas path detection device for battery gas production. Background Art

[0002] The booming new energy vehicle industry has led to a surge in demand for power batteries, especially lithium-ion batteries. The reasons for battery failure are varied, including overcharging and over-discharging, internal gas production, deactivation of active materials, and decomposition of electrolytes.

[0003] Currently, the measurement of battery gas production composition mainly relies on gas chromatography-mass spectrometry technology to extract and detect battery gas production. This method requires the extraction of a large number of gas samples, which is not applicable to the battery research stage that only produces a small amount of gas. In addition, gas chromatography-mass spectrometry technology cannot achieve real-time monitoring of changes in gas composition during battery use. In addition, when measuring with gas chromatography-mass spectrometry technology, gas needs to be extracted from the battery, which will destroy the original environment inside the battery and affect the actual performance of the battery in subsequent use. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an in-situ gas path detection device for battery gas production, so as to solve the problem of achieving real-time and accuracy in battery gas production component detection.

[0005] Based on the above-mentioned purpose, the utility model provides an in-situ gas path detection equipment for battery gas production, including: a base, an air inlet head is arranged on the upper end of the base, the air inlet head is fixedly installed with a three-way joint, a baseline gas path pipeline is fixedly installed at one end of the three-way joint, a first flow calculator is fixedly installed at a section of the baseline gas path pipeline away from the three-way joint, a test gas path pipeline is fixedly connected to the other end of the three-way joint, and a second flow calculator is fixedly connected to the end of the test gas path pipeline away from the three-way joint.

[0006] As an optional embodiment, a second manual air circuit valve is fixedly installed on one end of the second flow calculator away from the three-way connector, the second manual air circuit valve is fixedly connected to a second air inlet pipe on one end away from the second flow calculator, the second air inlet pipe is fixedly connected to the first air inlet pipe, and the other end of the first air inlet pipe is fixedly connected to a battery mold.

[0007] As an optional embodiment, the baseline gas circuit pipeline is fixedly connected to a first flow calculator at one end away from the gas inlet head, the other end of the first flow calculator is fixedly connected to a first manual gas circuit valve, and the first manual gas circuit valve is fixedly connected to an outlet head at one end away from the first flow calculator.

[0008] As an optional embodiment, the battery mold includes a battery mold cover and a battery mold base, the battery mold base is fixedly installed on the upper end of the base, the battery mold cover is fixedly installed on the upper end of the battery mold base, a second mold air inlet hole is opened on one side of the battery mold base, and a first mold air inlet hole is opened on the other side of the battery mold base away from the second mold air inlet hole.

[0009] As an optional implementation, a mold air outlet hole is opened on one side of the battery mold base, and the mold air outlet hole is on the same side as the first mold air inlet hole.

[0010] As an optional implementation, the first air inlet pipe is fixedly connected to the air inlet hole of the second mold, and the second air inlet pipe is fixedly connected to the air inlet hole of the first mold.

[0011] As an optional implementation, a mold air outlet high-pressure pipe is fixedly connected to the baseline air path pipeline, and the other end of the mold air outlet high-pressure pipe is fixedly connected to the mold air outlet hole.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model introduces argon gas through the first flow calculator and the first manual gas valve fixedly connected to the front end to control the flow of argon gas inside the first flow calculator, and at the same time quickly takes out the gas in the test gas pipeline, thereby improving the stability of the mass spectrometer baseline and improving the test accuracy.

[0014] 2. The mold air outlet and the baseline gas pipeline are connected to the air outlet head through a tee and then pass through a U-shaped cold trap. Its main purpose is to condense the electrolyte mixed in the produced gas to prevent the electrolyte from entering the mass spectrometer and causing damage to the instrument, thereby increasing the service life of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure distribution of the detection equipment of the embodiment of the utility model;

[0017] Figure 2 This is a three-dimensional schematic diagram of a battery mold according to an embodiment of the utility model;

[0018] Figure 3This is a schematic diagram of the sampling gas path for in-situ detection of gas components produced by a battery by a differential electrochemical mass spectrometer according to an embodiment of the utility model;

[0019] Figure 4 The figure is a schematic diagram of the gas path of the battery mold according to the embodiment of the utility model.

[0020] The markings in the figure are:

[0021] 1. Base; 2. Battery mold; 3. Mold air outlet high-pressure pipe; 4. Air outlet head; 5. First manual air circuit valve; 6. First flow calculator; 7. Baseline air circuit pipeline; 8. Air inlet head; 9. Second flow calculator; 10. Second manual air circuit valve; 11. Test air circuit pipeline; 12. First air inlet pipe; 13. Second air inlet pipe; 14. Battery mold cover; 15. First mold air inlet hole; 16. Battery mold base; 17. Second mold air inlet hole; 18. Mold air outlet hole; 19. Three-way connector. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] like Figure 1-Figure 4 As shown, an in-situ gas path detection device for battery gas production includes: a base 1, an air inlet head 8 is arranged on the upper end of the base 1, the air inlet head 8 is fixedly installed with a three-way joint 19, a baseline gas path pipeline 7 is fixedly installed at one end of the three-way joint 19, a first flow calculator 6 is fixedly installed at a section of the baseline gas path pipeline 7 away from the three-way joint 19, the other end of the three-way joint 19 is fixedly connected to a test gas path pipeline 11, and the end of the test gas path pipeline 11 away from the three-way joint 19 is fixedly connected to a second flow calculator 9.

[0025] As an optional embodiment, a second manual air circuit valve 10 is fixedly installed at one end of the second flow calculator 9 away from the three-way connector 19, a second manual air circuit valve 10 is fixedly connected to a second air inlet pipe 13 at one end away from the second flow calculator 9, a first air inlet pipe 12 is fixedly connected to the second air inlet pipe 13, a battery mold 2 is fixedly connected to the other end of the first air inlet pipe 12, a first flow calculator 6 is fixedly connected to one end of the baseline air circuit pipeline 7 away from the air inlet head 8, a first manual air circuit valve 5 is fixedly connected to the other end of the first flow calculator 6, an air outlet head 4 is fixedly connected to one end of the first manual air circuit valve 5 away from the first flow calculator 6, the battery mold 2 includes a battery mold cover plate 14 and a battery mold base 16, and the battery mold 2 includes a battery mold cover plate 14 and a battery mold base 16. The cell mold base 16 is fixedly installed on the upper end of the base 1, and a battery mold cover plate 14 is fixedly installed on the upper end of the battery mold base 16. A second mold air inlet hole 17 is opened on one side of the battery mold base 16, and a first mold air inlet hole 15 is opened on the other side of the battery mold base 16 away from the second mold air inlet hole 17. A mold air outlet hole 18 is opened on one side of the battery mold base 16, and the mold air outlet hole 18 is on the same side as the first mold air inlet hole 15. The second mold air inlet hole 17 is fixedly connected to the first mold air inlet hole 15. The second air inlet pipe 12 is fixedly connected to the first mold air inlet hole 15, and the second air inlet pipe 13 is fixedly connected to the first mold air inlet hole 15. The baseline air path pipeline 7 is fixedly connected to the mold air outlet high-pressure pipe 3, and the other end of the mold air outlet high-pressure pipe 3 is fixedly connected to the mold air outlet hole 18.

[0026] In this way, argon gas enters through the gas inlet head 8, and a part of the gas flows into the first flow calculator 6 through the baseline gas line pipe 7 through the three-way joint 19, and the other part flows into the second flow calculator 9 through the test gas line pipe 11. The first manual gas line valve 5 fixedly connected to the front end of the first flow calculator 6 controls the flow of argon gas inside the first flow calculator 6, thereby improving the stability of the mass spectrometer baseline and the test accuracy. On the other hand, the gas in the test gas line pipe 11 is quickly taken out. Combining the above two points, it can be seen that the gas velocity of the baseline gas line is relatively large, at 1-20ml / min. Compared with the baseline gas circuit, the air flow of the test gas circuit is smaller, generally 0.05-0.5ml / min. The main reason is that under the premise of ensuring that the argon gas can bring out the battery gas, the flow rate of the argon gas in the test gas circuit is minimized to reduce the volatilization of the electrolyte in the battery mold. One end of the test gas circuit pipeline 11 is fixedly connected to the second flow calculator 9 and the second manual gas circuit valve 10, which are used for the detection of the battery mold 2 of the battery testing system. The argon gas adopts the bottom-in and top-out method, which is mainly to ensure that the gas produced during the battery charging and discharging process can be fully brought out by the argon gas to ensure the authenticity of the test. The mold outlet hole 18 and the baseline gas circuit pipeline 7 are combined with the gas outlet head 4 through a tee, and then pass through a U-shaped cold trap. Its main purpose is to condense the electrolyte mixed in the gas production to prevent the electrolyte from entering the mass spectrometer and causing damage to the instrument. Subsequently, the gas production enters the differential electrochemical mass spectrometer with the carrier gas (argon gas) for component analysis.

[0027] In this embodiment, argon gas enters through the gas inlet head 8, and a part of the gas flows into the first flow calculator 6 through the baseline gas line 7 through the three-way joint 19, and the other part flows into the second flow calculator 9 through the test gas line 11. The first manual gas line valve 5 fixedly connected to the front end of the first flow calculator 6 controls the flow of argon gas inside the first flow calculator 6, thereby improving the stability of the mass spectrometer baseline and the test accuracy. On the other hand, the gas in the test gas line 11 is quickly taken out. Combining the above two points, it can be seen that the gas velocity of the baseline gas line is relatively large, at 1-20ml / min. Compared with the baseline gas circuit, the gas flow of the test gas circuit is smaller, generally 0.05-0.5ml / min. The main reason is that under the premise of ensuring that the argon gas can take out the battery gas, the flow rate of the argon gas in the test gas circuit is minimized to reduce the volatilization of the electrolyte in the battery mold. The test gas circuit pipeline 11 is fixedly connected to the second flow calculator 9 and the second manual gas circuit valve 10 at one end, which is used for the detection of the battery mold 2 of the battery testing system. The argon gas adopts the bottom-in and top-out method, which is mainly to ensure that the gas produced during the battery charging and discharging process can be fully taken out by the argon gas to ensure the authenticity of the test. The mold outlet 18 and the baseline gas circuit pipeline 7 and the gas outlet head 4 are converged through a tee, and then pass through a U-shaped cold trap. Its main purpose is to condense the electrolyte mixed in the gas production to prevent the electrolyte from entering the mass spectrometer and causing damage to the instrument. Subsequently, the gas production enters the differential electrochemical mass spectrometer with the carrier gas (argon gas) for component analysis.

[0028] A person skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An in-situ gas path detection device for battery gas production, comprising: The base (1) is characterized in that an air inlet head (8) is arranged at the upper end of the base (1); the air inlet head (8) is fixedly installed with a three-way joint (19); a baseline gas path pipeline (7) is fixedly installed at one end of the three-way joint (19); a first flow calculator (6) is fixedly installed at a section of the baseline gas path pipeline (7) away from the three-way joint (19); the other end of the three-way joint (19) is fixedly connected to a test gas path pipeline (11); and the end of the test gas path pipeline (11) away from the three-way joint (19) is fixedly connected to a second flow calculator (9).

2. The in-situ gas path detection device for battery gas production according to claim 1, characterized in that: A second manual air circuit valve (10) is fixedly mounted on one end of the second flow rate calculator (9) away from the three-way connector (19); a second air circuit valve (10) is fixedly connected to one end of the second flow rate calculator (9) away from the second flow rate calculator (9); a first air circuit pipe (12) is fixedly connected to the second air circuit pipe (13); and a battery mold (2) is fixedly connected to the other end of the first air circuit pipe (12).

3. The in-situ gas path detection device for battery gas production according to claim 1, characterized in that: The end of the baseline gas circuit pipeline (7) away from the gas inlet head (8) is fixedly connected to a first flow calculator (6), the other end of the first flow calculator (6) is fixedly connected to a first manual gas circuit valve (5), and the end of the first manual gas circuit valve (5) away from the first flow calculator (6) is fixedly connected to an outlet head (4).

4. The in-situ gas path detection device for battery gas production according to claim 2, characterized in that: The battery mold (2) comprises a battery mold cover plate (14) and a battery mold base (16); the battery mold base (16) is fixedly mounted on the upper end of the base (1); the battery mold cover plate (14) is fixedly mounted on the upper end of the battery mold base (16); a second mold air inlet hole (17) is provided on one side of the battery mold base (16); and a first mold air inlet hole (15) is provided on the other side of the battery mold base (16) away from the second mold air inlet hole (17).

5. The in-situ gas path detection device for battery gas production according to claim 4, characterized in that: A mold air outlet hole (18) is provided on one side of the battery mold base (16), and the mold air outlet hole (18) is on the same side as the first mold air inlet hole (15).

6. The in-situ gas path detection device for battery gas production according to claim 4, characterized in that: The first air inlet pipe (12) is fixedly connected to the second mold air inlet hole (17), and the second air inlet pipe (13) is fixedly connected to the first mold air inlet hole (15).

7. The in-situ gas path detection device for battery gas production according to claim 5, characterized in that: The base line gas path pipeline (7) is fixedly connected to a mold air outlet high pressure pipe (3), and the other end of the mold air outlet high pressure pipe (3) is fixedly connected to the mold air outlet hole (18).

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