Lithium ion battery fluid collecting device

Abstract

The utility model discloses a lithium ion battery fluid collecting device, and belongs to the technical field of lithium ion battery detection auxiliary equipment. The device is provided with a gas collection chamber, a puncture device arranged at the gas inlet end of the gas collection chamber, and an exhaust soft rubber sealing joint arranged at the exhaust end of the gas collection chamber, the flexible glue adsorption head is mounted at the bottom end of the puncturing device and is used for being adsorbed on the surface of the lithium ion battery in a sealing manner; the bottom end of the puncture device is provided with a puncture needle capable of penetrating into a closed cavity formed by the flexible glue adsorption head and the surface of the lithium ion battery, and the bottom end of the puncture device is further provided with an adjusting device which can be penetrated by the puncture needle and is used for compensating the length of the puncture device. The gas collecting device has the advantages of being simple in structure, convenient to operate and high in gas collecting efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for lithium-ion battery testing, and in particular to a fluid collection device for lithium-ion batteries. Background Technology

[0002] Lithium-ion batteries generate a certain amount of gas during use, mainly due to the decomposition of the electrolyte solvent and irreversible side reactions between the electrode materials and the electrolyte. These gases can lead to increased internal pressure, electrode expansion, and increased internal resistance, thus affecting the battery's cycle performance and safety. Therefore, analyzing the composition of gases generated inside lithium-ion batteries is of great significance for studying the internal reaction mechanism of batteries and optimizing battery design and manufacturing processes.

[0003] CN219065015U discloses a gas collection device in a gas composition analysis system, including a fixture housing, a gas collection chamber, a puncture needle, and a gas transfer channel. This device makes the puncture method more flexible, suitable for samples of different packaging and sizes, while increasing the gas collection volume. However, this device still has problems such as unstable advancement of the puncture needle within the fixture and poor applicability of the base for fixing the product to be tested.

[0004] CN211292439U discloses a gas collection device and a battery cover for battery testing, including a gas guiding mechanism and a gas collection body disposed on the battery casing. This device can continuously extract gas from inside the battery, thereby enabling real-time detection of the composition and volume of the gas generated inside the battery. However, this device still suffers from problems such as low gas collection efficiency and insufficient sealing.

[0005] The existing technology has the following drawbacks:

[0006] 1. The operation process is complex, requires the use of an external air circuit, and has significant operational limitations;

[0007] 2. The device has a relatively complex structure, which is not conducive to the convenient collection of gas;

[0008] 3. The gas collection efficiency is low, making it difficult to accurately obtain the gas composition inside the battery;

[0009] 4. Insufficient sealing may affect the accuracy of gas composition;

[0010] 5. The puncture needle is unstable in its advancement within the tooling fixture, and the base support has poor applicability to fixing the product under test. Utility Model Content

[0011] The purpose of this invention is to overcome the defects of the existing technology and provide a lithium-ion battery fluid collection device, which at least solves the problems of low gas collection efficiency and poor sealing in the existing technology.

[0012] To achieve the above objectives, this utility model provides the following technical solution:

[0013] This utility model discloses a lithium-ion battery fluid collection device, comprising:

[0014] A gas collection chamber, a puncture device installed at the inlet end of the gas collection chamber, and an exhaust soft rubber sealing connector installed at the exhaust end of the gas collection chamber; and

[0015] The soft rubber adsorption head installed at the bottom of the puncture device is used to seal and adsorb onto the surface of the lithium-ion battery.

[0016] The bottom end of the puncture device has a puncture needle that can penetrate into the sealed cavity formed by the soft adhesive adsorption head and the surface of the lithium-ion battery, and the bottom end of the puncture device is also equipped with an adjustment device that allows the puncture needle to penetrate and is used to compensate for the length of the puncture device.

[0017] Furthermore, the gas collection chamber is constructed as a flexible soft-shell chamber.

[0018] Furthermore, an inlet check valve is installed at the inlet end of the gas collection chamber, and an inlet switch is installed at the bottom of the inlet check valve. An exhaust check valve is installed at the exhaust end of the gas collection chamber, and an exhaust switch is installed at the top of the exhaust check valve.

[0019] The exhaust port check valve and the intake port check valve have the same valve direction.

[0020] Furthermore, the adjusting device is a limiting block, and the outer wall of the limiting block is threadedly connected to the bottom end of the outer shell of the puncture device.

[0021] Furthermore, the adjusting device is a limiting sleeve, and the inner wall of the limiting sleeve is threadedly connected to the bottom end of the outer shell of the puncture device.

[0022] In the above technical solution, the lithium-ion battery fluid collection device provided by this utility model has the following advantages:

[0023] The lithium-ion battery fluid collection device designed in this utility model has a gas collection chamber exhaust end connected to a gas chromatograph injection tube via an exhaust soft rubber sealed connector. A puncture device is installed at the gas collection chamber inlet end, and a soft rubber adsorption head is installed at the bottom of the puncture device. The soft rubber adsorption head is sealed and adsorbed onto the surface of the lithium-ion battery, forming a sealed chamber that isolates air at the puncture site, ensuring airtightness. Simultaneously, the double-layer structure prevents gas leakage after battery puncture from causing air leakage near the inner soft rubber adsorption head, allowing external air to enter the soft rubber adsorption area and contaminate the sample. Furthermore, the bottom of the puncture device has a puncture needle that can penetrate deep into the sealed chamber formed by the soft rubber adsorption head and the lithium-ion battery surface. The bottom of the puncture device also has an adjustment device that allows the puncture needle to penetrate, compensating for the length of the puncture device and thus controlling the extension length of the puncture needle. Compared with the prior art, this lithium-ion battery fluid collection device has the following advantages:

[0024] 1) It overcomes the shortcomings of existing technologies, such as complex operation processes and significant limitations, and features a simple structure and convenient operation;

[0025] 2) This device can be directly connected to the gas chromatograph injection tube, which realizes the convenience of gas collection and overcomes the shortcomings of low gas collection efficiency in the existing technology.

[0026] 3) The puncture device adopts a soft rubber suction head, puncture needle and puncture depth adjustment device design, which makes the puncture needle advance stable and the test product has good applicability, overcoming the shortcomings of the existing technology of unstable puncture needle advance and poor applicability of base fixation.

[0027] 4) The gas collection chamber adopts a soft shell elastic structure design, which can be compressed and rebounded, which is conducive to the collection and discharge of gas and improves the gas collection efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0029] Figure 1 This is a schematic diagram of the overall structure of a lithium-ion battery fluid collection device disclosed in this utility model;

[0030] Figure 2 This is a schematic diagram of the puncture device structure of a lithium-ion battery fluid collection device disclosed in this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Outer layer of soft rubber adsorption head; 2. Inner layer of soft rubber adsorption head; 3. Puncture needle; 4. Puncture device; 5. Air inlet switch; 6. One-way valve at the air inlet; 7. Gas collection chamber; 8. One-way valve at the exhaust port; 9. Exhaust switch; 10. Exhaust connector; 11. Outer shell; 12. Button; 13. Hammer blocking buckle; 14. Baffle; 15. Internal thread; 16. Hammer spring; 17. Hammer; 18. Limiting plate; 19. Limiting slider. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0034] See Figure 1 As shown;

[0035] The utility model discloses a fluid collection device for lithium-ion batteries. The fluid collected by the device is either gas or electrolyte. Taking gas as an example, the fluid collection device for lithium-ion batteries includes: a gas collection chamber 7, a puncture device, and an exhaust soft rubber sealing joint 10.

[0036] The gas collection chamber 7 has a threaded connection to the inlet end with a puncture device, and the gas collection chamber 7 has a threaded connection to the exhaust end with an exhaust soft rubber sealing connector 10. The exhaust soft rubber sealing connector 10 is made of silicone material and has an inner diameter of 2 mm. It is connected to the external gas chromatograph injection tube through the exhaust soft rubber sealing connector 10.

[0037] The puncture device has a housing 11, the top of which is threaded to the gas collection chamber 7. A soft rubber adsorption head is fixedly connected to the bottom of the puncture device. The soft rubber adsorption head includes an outer layer 1 and an inner layer 2, which is a double-layer structure. It is made of silicone and has a diameter of 20 mm and a thickness of 5 mm. The soft rubber adsorption head is sealed and adsorbed onto the surface of the lithium-ion battery to form a sealed chamber, which isolates the air at the puncture site. At the same time, the double-layer structure can prevent gas from escaping after the battery is punctured, which would cause air leakage near the inner soft rubber adsorption head and allow external air to enter the soft rubber adsorption area, causing sample contamination.

[0038] The bottom of the puncture device is equipped with a puncture needle 3 that can penetrate into the sealed cavity formed by the soft adhesive adsorption head and the surface of the lithium-ion battery. The puncture needle is made of stainless steel, with an outer diameter of 0.5 mm and a length of 10 mm. The puncture needle 3 punctures the outer shell of the lithium-ion battery to release the gas inside the battery. The bottom of the puncture device is also equipped with an adjustment device that allows the puncture needle 3 to penetrate and compensate for the length of the puncture device. The puncture depth of the puncture needle 3 can be controlled by the adjustment device, so that the puncture depth of the puncture needle 3 is controllable.

[0039] See Figure 1 As shown:

[0040] Preferably, the gas collection chamber 7 is constructed as an elastic soft-shell chamber made of polypropylene. The soft-shell chamber adopts a soft-shell elastic structure, which can be compressed and rebounded. The specific chamber volume is 50 ml. The gas collection chamber 7 includes an air inlet and an air outlet. An air inlet one-way valve 6 is installed at the air inlet of the gas collection chamber 7. An air inlet switch 5 is installed at the bottom of the air inlet one-way valve 6. An air outlet one-way valve 8 is installed at the air outlet of the gas collection chamber 7. An air outlet switch 9 is installed at the top of the air outlet one-way valve 8. The air outlet one-way valve 8 and the air inlet one-way valve 6 have the same valve direction.

[0041] See Figure 2 As shown:

[0042] Preferably, the adjusting device is a limiting block 19 or a limiting sleeve;

[0043] When the adjusting device is a limiting block 19, the inner wall of the bottom end of the puncture device housing 11 has an internal thread 15, and the outer wall of the limiting block 19 is threadedly connected to the puncture device housing 11. When the adjusting device is a limiting sleeve (not shown), the inner wall of the limiting sleeve is threadedly connected to the puncture device housing 11. In this structure, the puncture device housing 11 controls the extension length of the puncture needle 3 by adjusting the screw-out length of the adjusting device. When in use, the longer the screw-out length of the adjusting device is, the shorter the extension length of the puncture needle 3 is, and vice versa.

[0044] In a preferred embodiment, a puncture needle 3 is fixedly connected to the center of the bottom end of the puncture device housing 11. The puncture needle 3 can be a hollow structure, and after puncturing the battery casing, the gas can enter the gas collection chamber 7 through the puncture needle 3.

[0045] Of course, the puncture device can also be other puncture devices in the prior art, such as those similar to the manual ejection-type assisted blood collection device in the prior art, and is not limited to the structure in the above embodiment where the puncture needle 3 is fixedly set, such as... Figure 2 As shown, the puncture needle 3 of the puncture device can be telescopic. A button 12 is installed on the side wall of the outer shell 11 of the puncture device. A hammer 17 is installed inside the outer shell 11. A hammer spring 16 is arranged above the hammer 17. The button 12 is connected to the hammer blocking buckle 13 on the hammer 17. The hammer blocking buckle 13 is triggered by the button 12 to release the hammer 17. The hammer spring 16 generates a power source, and the hammer 17 strikes the top of the puncture needle 3, impacting the puncture needle 3 to puncture the battery shell. The manual ejection type auxiliary blood collection device has a baffle 14 at the bottom of the outer shell 11 of the puncture device, which is used to abut against the limiting plate 18 at the top of the puncture needle 3, thereby preventing the puncture needle 3 from moving downward and preventing the puncture needle 3 from coming out. A return spring (not shown) is fitted between the limiting plate 18 and the baffle 14. The return spring is a compression spring. The return spring drives the puncture needle 3 to return to the outer shell 11.

[0046] In the above technical solution, the working principle of the lithium-ion battery fluid collection device provided by this utility model is as follows:

[0047] During operation, first connect the puncture device to the gas collection chamber 7, close the inlet switch 5 and the exhaust switch 9 at both ends of the gas collection chamber 7, then squeeze the gas collection chamber 7. The gas in the gas collection chamber 7 can be discharged through the one-way valve 8 at the exhaust port. At this time, the gas collection chamber 7 is under negative pressure. Adjust the adjustment device so that the puncture needle 3 is 5 mm deep and aligned with the appropriate position on the battery so that the soft rubber adsorption head of the puncture device is at the puncture site. Press button 12, and hammer 17 strikes the puncture needle 3, causing the puncture needle 3 to pierce the battery. Then open the inlet switch 5 of the gas collection chamber 7, and the gas inside the battery enters the chamber 7. Close the inlet switch 5. Finally, connect the exhaust connector to the gas chromatograph, open the exhaust switch 9, and continue to squeeze until the gas collection chamber 7 is emptied for gas chromatography testing. At the same time, this collection device is also suitable for electrolyte extraction.

[0048] This lithium-ion battery fluid collection device has a simple structure and is easy to operate. It can be directly connected to a gas chromatograph injection tube to realize online collection and analysis of gases inside the battery, which is conducive to in-depth research on the internal reaction mechanism of the battery and provides guidance for the optimization of battery design and production process.

[0049] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lithium-ion battery fluid collection device, characterized in that, include: Gas collection chamber (7), puncture device installed at the inlet end of the gas collection chamber (7), and exhaust soft rubber sealing connector (10) installed at the exhaust end of the gas collection chamber (7); and The soft rubber adsorption head installed at the bottom of the puncture device is used to seal and adsorb onto the surface of the lithium-ion battery. The bottom end of the puncture device has a puncture needle (3) that can penetrate into the sealed cavity formed by the soft adhesive adsorption head and the surface of the lithium-ion battery. The bottom end of the puncture device is also equipped with an adjustment device that allows the puncture needle (3) to penetrate and is used to compensate for the length of the puncture device.

2. The lithium-ion battery fluid collection device according to claim 1, characterized in that: The gas collection chamber (7) is constructed as a flexible soft-shell chamber.

3. The lithium-ion battery fluid collection device according to claim 2, characterized in that: The gas collection chamber (7) is equipped with an inlet one-way valve (6) at the inlet end, and an inlet switch (5) is installed at the bottom of the inlet one-way valve (6). The gas collection chamber (7) is equipped with an exhaust one-way valve (8) at the exhaust end, and an exhaust switch (9) is installed at the top of the exhaust one-way valve (8). The exhaust port check valve (8) and the intake port check valve (6) have the same valve direction.

4. A lithium-ion battery fluid collection device according to claim 1, characterized in that: The adjusting device is a limiting block (19), and the outer wall of the limiting block (19) is threadedly connected to the bottom end of the outer shell (11) of the puncture device.

5. A lithium-ion battery fluid collection device according to claim 1, characterized in that: The adjusting device is a limiting sleeve, and the inner wall of the limiting sleeve is threadedly connected to the bottom end of the outer shell (11) of the puncture device.

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