Gas sensing detection device for lithium battery electrolyte leakage

Abstract

A gas sensing detection device for lithium battery electrolyte leakage comprises a detection box and a detection pipeline, a to-be-detected lithium battery is placed in an inner cavity of the detection box, one end of the detection pipeline is a gas inlet end, the other end of the detection pipeline is a gas outlet end, and the gas inlet end and the gas outlet end are both communicated with the inner cavity of the detection box. The detection pipeline is further provided with an air exhaust element, a heating element and a gas sensing detection element, the air exhaust end is connected with a plurality of air exhaust branch pipes, any air exhaust branch pipe is connected with an air exhaust nozzle, and the air exhaust direction of the air exhaust nozzles is parallel to the side face of the lithium battery to be detected in the inner cavity of the detection box. The lithium battery electrolyte leakage detection device is used for reducing the influence of hot air on the structure and performance of the lithium battery and improving the safety in the lithium battery electrolyte leakage detection process.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery detection, in particular to a gas sensing detection device for lithium battery electrolyte leakage. Background Art

[0002] Lithium-ion batteries pose safety risks such as spontaneous combustion and explosion, making their safety research crucial. Lithium-ion batteries often experience electrolyte leakage when they malfunction. This volatile electrolyte releases a signature gas, so detecting this gas can be used to monitor the safety of lithium-ion batteries.

[0003] In order to achieve rapid detection of electrolyte leakage, CN202421187010.6 discloses a battery detection device, which includes a cavity for accommodating a lithium battery to be tested and a pipeline with both ends connected to the cavity, and a heating element and a detection component are sequentially arranged on the pipeline. The heating element is used to heat the gas in the pipeline so that the temperature of the gas in the heating pipeline increases. On the one hand, the temperature of the gas in the pipeline can be maintained within a certain temperature range by the heating element, reducing the influence of the temperature on the detection component, thereby improving the detection accuracy of the detection component; on the other hand, the gas heated in the pipeline undergoes thermal diffusion, which can accelerate the gasification of the electrolyte in the battery cell with electrolyte leakage, so as to accelerate the release into the pipeline, thereby improving the sensitivity of the battery detection device.

[0004] However, in the above technical solution, although the heating element does not directly heat the battery cell in the cavity, which reduces the impact on the structure and performance of the battery cell itself to a certain extent, the end of the pipeline still points to the battery cell, so that the hot air discharged in the pipeline is still concentrated toward a certain point on the end face of the battery cell. As a result, the temperature of the corresponding point on the end face of the battery cell and its surrounding positions will continue to rise rapidly, which may still easily affect the internal structure and performance of the battery cell, and thus cause unnecessary damage to the battery cell during the leakage detection process. Utility Model Content

[0005] The utility model aims to provide a gas sensing detection device for lithium battery electrolyte leakage, reduce the impact of hot air on the structure and performance of the lithium battery, and improve the safety of the lithium battery electrolyte leakage detection process.

[0006] In order to solve the above technical problems, the specific solution adopted by the utility model is: a gas sensing detection device for lithium battery electrolyte leakage, including a detection box and a detection pipeline. The inner cavity of the detection box is for placing the lithium battery to be tested. One end of the detection pipeline is the air inlet end, and the other end is the exhaust end, and the air inlet end and the exhaust end are both connected to the inner cavity of the detection box. A vacuum element, a heating element and a gas sensing detection element are also provided on the detection pipeline. A plurality of exhaust branch pipes are connected to the exhaust end, and an exhaust nozzle is connected to any exhaust branch pipe. The exhaust direction of the exhaust nozzle is parallel to the side distribution of the lithium battery to be tested located in the inner cavity of the detection box.

[0007] Preferably, the exhaust nozzle is fan-shaped, with a base portion connected to the exhaust branch pipe and a wide portion distributed toward the side of the lithium battery to be tested located in the inner cavity of the test box.

[0008] Preferably, there are four exhaust branches and corresponding four exhaust nozzles, and the four exhaust nozzles are respectively distributed on the four sides of the lithium battery to be tested in the longitudinal direction of the inner cavity of the test box.

[0009] Preferably, the exhaust branch pipe is a bellows.

[0010] Preferably, the detection pipeline is connected to an exhaust pipe via a three-way valve.

[0011] Preferably, an air extraction element, an exhaust pipe, a heating element and a gas sensing detection element are sequentially arranged along the detection pipeline in a direction from the air inlet end toward the exhaust end.

[0012] Preferably, the side wall of the detection box corresponding to the air inlet end is provided with a conical guide surface with a small end pointing to the air inlet end.

[0013] Preferably, the test box is provided with a plurality of pillars for supporting the lithium battery to be tested.

[0014] The utility model comprises a detection box and a detection pipeline, with a heating element and a gas sensing element connected in sequence to the detection pipeline. The temperature of the gas to be detected is increased by the heating element, enabling the gas sensing element to operate at a relatively ideal temperature, thus ensuring its detection accuracy. Both ends of the detection pipeline are connected to the detection box, allowing the hot air in the detection pipeline to enter the detection box through its own exhaust end, thereby accelerating the volatilization of any leaked electrolyte in the detection box and allowing it to enter the detection pipeline as quickly as possible, thereby improving the detection sensitivity.

[0015] On the basis of the above technical effects, the exhaust end of the detection pipeline of the utility model is provided with multiple exhaust branches, and any exhaust branch is provided with an exhaust nozzle, and the exhaust direction of the exhaust nozzle is parallel to the side distribution of the lithium battery to be tested in the inner cavity of the detection box. On the one hand, the hot air is blown only from the side of the lithium battery, avoiding the hot air blowing directly toward a certain point on the end of the lithium battery, causing the temperature of the corresponding point and the surrounding area to rise sharply and damage the lithium battery, thereby improving the safety during the detection process; on the other hand, the lithium battery is evenly wrapped by the hot air, and the temperature of each position on the surrounding side is relatively uniform, which is more conducive to the volatilization of the leaked electrolyte generated on any surrounding side, so that it is easier to be transported to the gas sensing detection element through the detection pipeline, thereby further improving the sensitivity of the utility model.

[0016] In a preferred embodiment of the present invention, an exhaust pipe is also connected to the detection pipeline. After the exhaust pipe is connected to the exhaust gas collection equipment in the detection laboratory, before each lithium battery is tested, the gas in the entire detection box and the detection pipeline can be discharged through the vacuum element to avoid interference caused by residual electrolyte gas that may exist in the detection of the previous lithium battery, thereby improving the accuracy of the detection of each lithium battery of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of the utility model;

[0018] Figure 2 for Figure 1 AA cross-sectional structural diagram;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the exhaust nozzle part of the present invention;

[0020] Markings in the figure: 1. Exhaust end, 2. Exhaust branch pipe, 3. Exhaust nozzle, 4. Lithium battery to be tested, 5. Test box, 6. Conical guide surface, 7. Inlet end, 8. Exhaust element, 9. Three-way valve, 10. Exhaust pipe, 11. Test pipeline, 12. Support, 13. Heating element, 14. Gas sensor detection element. DETAILED DESCRIPTION

[0021] like Figure 1As shown, the present invention is a gas sensing detection device for lithium battery electrolyte leakage. The same as the detection device mentioned in the background art, both include a detection box 5 for accommodating a lithium battery 4 to be tested and a detection pipeline 11 connected to the detection box 5. The detection box 5 is generally rectangular, with an inner cavity slightly larger than a single lithium battery 4 to be tested. The box wall has an openable and closable box door, and a plurality of pillars 12 are arranged in the inner cavity for the lithium batteries 4 to be tested to be placed one by one and complete the detection. The detection pipeline 11 is C-shaped, with both ends connected to the inner cavity of the detection box 5. The right end is the air inlet end 7, and the left end is the exhaust end 1. The air inlet end 7 and the exhaust end 1 are both connected to the inner cavity of the detection box 5. On the detection pipeline 11, an exhaust fan as an exhaust element 8, a resistive heater as a heating element 13, and a gas sensor as a gas sensing detection element 14 are sequentially arranged along the direction from the air inlet end 7 to the exhaust end 1. During the detection process, the exhaust element 8 draws the gas in the detection box 5 along the inner cavity. Figure 1 In the clockwise cycle, when the gas moves to the heating element 13, the temperature increases, and then moves to the gas sensing element 14 to react with the gas sensitive material layer in the gas sensing element 14, causing the resistance to change to complete the detection of the specific gas.

[0022] Different from the detection device mentioned in the background technology, Figure 1 、 2 As shown, the present invention is connected to the exhaust end 1 located in the inner cavity of the detection box 5 with four exhaust branch pipes 2, and the port of each exhaust branch pipe 2 is provided with the following Figure 3 The exhaust nozzle 3 shown. The exhaust nozzle 3 is flat and fan-shaped, with the small end connected to the exhaust branch pipe 2 and the large end parallel to the longitudinal side surface of the lithium battery 4 to be tested, so that the hot air discharged from the detection pipeline 11 is not concentrated at a point at the end of the lithium battery 4 to be tested, but only blows through the side of the lithium battery 4 to be tested, thereby avoiding local overheating of the lithium battery 4 to be tested that affects its own structure and performance, and making the temperature around the lithium battery 4 to be tested more uniform, which is more conducive to the volatilization of leaked electrolyte, so that the gas sensing detection element 14 can be quickly detected. After blowing through the lithium battery 4 to be tested, the hot air enters the right side of the inner cavity of the detection box 5. The side wall of the right end of the detection box 5 is set as a conical guide surface 6 with the small end pointing to the air inlet end 7, so that the hot air can re-enter the detection pipeline 11 from the air inlet end 7 for circulation.

[0023] The exhaust branch pipe 2 in this embodiment is a bellows that can be pulled to move the position of each exhaust nozzle 3 to accommodate the testing of lithium batteries 4 of varying shapes. Furthermore, an exhaust pipe 10 is connected to the test line 11 between the exhaust element 8 and the heating element 13 via a three-way valve 9. Once the exhaust pipe 10 is connected to the exhaust gas collection equipment in the testing laboratory, the exhaust element 8 extracts gas from the test box 5 and the test line 11 to the exhaust gas collection equipment for processing before each lithium battery is tested, ensuring that the testing of the lithium batteries 4 does not interfere with each other.

Claims

1. A gas sensing detection device for lithium battery electrolyte leakage, comprising a detection box (5) and a detection pipeline (11), wherein the inner cavity of the detection box (5) is for placing the lithium battery (4) to be tested, one end of the detection pipeline (11) is an air inlet end (7), and the other end is an exhaust end (1), and the air inlet end (7) and the exhaust end (1) are both connected to the inner cavity of the detection box (5), and an air extraction element (8), a heating element (13) and a gas sensing detection element (14) are further provided on the detection pipeline (11), characterized in that: The exhaust end (1) is connected to a plurality of exhaust branch pipes (2), and each exhaust branch pipe (2) is connected to an exhaust nozzle (3), and the exhaust directions of the exhaust nozzles (3) are all parallel to the side distribution of the lithium battery (4) to be tested located in the inner cavity of the detection box (5).

2. A gas sensing device for detecting lithium battery electrolyte leakage according to claim 1, characterized in that: The exhaust nozzle (3) is fan-shaped, with its base connected to the exhaust branch pipe (2) and its wide portion distributed toward the side of the lithium battery (4) to be tested located in the inner cavity of the detection box (5).

3. A gas sensing device for detecting lithium battery electrolyte leakage according to claim 2, characterized in that: It has four exhaust branch pipes (2) and corresponding four exhaust nozzles (3), and the four exhaust nozzles (3) are respectively distributed corresponding to four side surfaces in the longitudinal direction of a lithium battery (4) to be tested located in the inner cavity of the test box (5).

4. The gas sensing device for detecting lithium battery electrolyte leakage according to claim 1, wherein: The exhaust branch pipe (2) is a bellows.

5. The gas sensing device for detecting lithium battery electrolyte leakage according to claim 1, wherein: The detection pipeline (11) is connected to an exhaust pipe (10) via a three-way valve (9).

6. A gas sensing device for detecting lithium battery electrolyte leakage according to claim 5, characterized in that: An air extraction element (8), an exhaust pipe (10), a heating element (13) and a gas sensing detection element (14) are sequentially arranged on the detection pipeline (11) along a direction from the air inlet end (7) toward the exhaust end (1).

7. The gas sensing device for detecting lithium battery electrolyte leakage according to claim 1, wherein: A conical flow guide surface (6) with a small end pointing toward the air inlet end (7) is provided on the side wall of the detection box (5) corresponding to the air inlet end (7).

8. The gas sensing device for detecting lithium battery electrolyte leakage according to claim 1, wherein: A plurality of pillars (12) for supporting the lithium battery (4) to be tested are provided in the testing box (5).

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