Automatic sampling and sampling instrument for battery bulge gas

Abstract

The utility model relates to the technical field of battery bulge gas detection, and discloses a battery bulge gas automatic sampling and sampling instrument which comprises an air bag, an air bag valve, a sampling needle and a driving mechanism, the air bag is used for wrapping a battery to be detected, one end of the air bag valve is connected with the air bag, and the other end of the air bag valve is connected with the sampling needle. The front end of the sampling needle is arranged right opposite to one end, far away from the air bag, of the air bag valve, the driving mechanism is used for driving the sampling needle and the air bag valve to be close to each other or far away from each other, and when the sampling needle and the air bag valve are close to each other, the front end of the sampling needle can pierce the air bag valve to extend into the air bag; when the sampling needle and the air bag valve are far away from each other and separated from each other, the air bag valve can realize self-sealing; the automatic sampling and sampling instrument for the battery bulge gas can realize automatic sampling and repeated sampling, and ensures that a detection result is accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery bulging gas detection technical field, concretely is a kind of battery bulging gas automatic sampling sample introduction instrument. BACKGROUND

[0002] Battery bulging gas detection is an important link of battery safety detection, and the main purpose is to timely find and handle battery bulging problem, prevent battery explosion or fire and other serious consequences.Gases in battery bulging gas are generally hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane and carbon 2 (C2, such as ethane, ethylene, propane, etc.) above hydrocarbon gas components, due to the small volume of battery, the gas sample amount generated by bulging is also very small, there are always sampling difficulties, air mixed into sample gas to cause detection inaccurate and other problems when detecting.

[0003] Specifically, the existing sampling and sampling mode is to use airtight needle sampling and sampling, first use airtight needle to pierce the outer package of battery, then extract the gas in battery, then adjust the scale value of airtight needle to pierce airtight needle into the sampling port of gas chromatograph, then manually inject sample gas in airtight needle into the sampling port of gas chromatograph, and analyze gas components by gas chromatograph.In practice, this sampling and sampling mode mainly has the following defects:

[0004] Firstly, due to the existence of a large amount of oxygen and nitrogen in air, the gas amount in battery bulging is relatively small (generally in several milliliters to tens of milliliters), and most of the batteries are packaged with aluminum foil composite bag, since the aluminum foil composite bag has no elasticity, when airtight needle pierces into aluminum foil composite bag, it cannot be well sealed, when using airtight needle to extract gas in battery sample, battery is exposed to air, oxygen and nitrogen components in air will inevitably mix into battery interior, be extracted into needle cylinder by sampling needle, so that sample is interfered and contaminated by air, resulting in inaccurate detection.

[0005] Secondly, due to the small amount of battery gas sample, after sampling by airtight needle, it cannot be sealed again, the needle hole of aluminum foil composite bag is exposed to air, air components may enter aluminum foil composite bag, and repeated sampling cannot be carried out.

[0006] Thirdly, airtight needle sampling adopts manual operation, which is easy to introduce artificial error to analysis result, causing inaccurate detection result. INVENTION CONTENTS

[0007] The utility model aims at overcoming the defects of prior art, and provides a kind of battery bulging gas automatic sampling sample introduction instrument, which can realize automatic sampling, repeated sampling and ensure accurate detection result.

[0008] The utility model aims at overcoming the defects of prior art, and provides a kind of battery bulging gas automatic sampling sample introduction instrument, which can realize automatic sampling, repeated sampling and ensure accurate detection result.

[0009] An automatic sampling instrument for battery bulging gas, comprising a gas bag, a gas bag valve, a sampling needle and a driving mechanism, the gas bag is used for covering a battery to be detected, one end of the gas bag valve is connected with the gas bag, the front end of the sampling needle is arranged opposite to the end of the gas bag valve away from the gas bag, the driving mechanism is used for driving the sampling needle and the gas bag valve to approach or move away from each other, when the sampling needle and the gas bag valve approach each other, the front end of the sampling needle can pierce the gas bag valve and extend into the gas bag, and can also pierce into the bulging part of the battery to be detected in the gas bag, when the sampling needle and the gas bag valve move away from each other, the gas bag valve can realize self-sealing.

[0010] Further, a vacuum pump and a sample tube are further included, the rear end of the sampling needle and the suction end of the vacuum pump are both communicated with the sample tube, a valve A is arranged between the sampling needle and the sample tube, and a valve B is arranged between the sample tube and the vacuum pump.

[0011] Further, a sampling mechanism and a gas chromatograph are further included, the sampling mechanism is communicated and arranged between the valve B and the vacuum pump, a valve C is further arranged between the sampling mechanism and the vacuum pump, the sampling mechanism is communicated with the gas chromatograph, and the sampling mechanism is used for quantitatively sampling gas into the gas chromatograph.

[0012] Specifically, a gas bag clamp is further included, the gas bag clamp comprises an upper clamp plate, a lower clamp plate and a lock buckle, the upper clamp plate is rotatably connected with the lower clamp plate, the upper clamp plate and the lower clamp plate are folded to form a clamping hole, the gas bag valve is arranged in the clamping hole, and the lock buckle is used for fixing the upper clamp plate and the lower clamp plate when the upper clamp plate and the lower clamp plate are folded.

[0013] Further, a positioning groove is processed in the circumference of the clamping hole, and a positioning table is arranged in the circumference of the gas bag valve, and the positioning table is adaptively arranged in the positioning groove.

[0014] Specifically, a machine body is further included, the driving mechanism comprises a first telescopic part and a second telescopic part, the sampling needle and the first telescopic part are both fixedly installed on the machine body, the extension end of the first telescopic part is fixedly connected with the second telescopic part, and the extension end of the second telescopic part is fixedly connected with the lower clamp plate.

[0015] Specifically, the gas bag valve is made of soft and elastic material, or a partition pad made of soft and elastic material is arranged in the gas bag valve.

[0016] Specifically, the sampling needle adopts a side opening design, and a sealing clamp strip is arranged on the gas bag.

[0017] The beneficial effects of the utility model are as follows:

[0018] This automated sampling and injection instrument for battery bulge gas includes a gas bag, a gas bag valve, a sampling needle, and a drive mechanism. In application, the battery sample is first loaded into the gas bag and sealed. Then, the sampling needle pierces the gas bag valve and extends into the gas bag to extract all the air. The sampling needle then pierces the bulge area of ​​the battery sample to extract the sample. Because all air outside the battery sample is extracted from the gas bag before sampling, the gas bag effectively isolates the battery sample from air, preventing air contamination from affecting sampling accuracy. The gas bag valve has a self-sealing function. Since all air has been expelled from the gas bag during sampling, the gas remaining in the gas bag is solely battery bulge gas. This sample gas is collected and stored in a sample tube. Therefore, multiple samplings can be performed on the same battery without the possibility of sample contamination, eliminating concerns about the accuracy of multiple parallel injections.

[0019] A sample tube and a vacuum pump are sequentially connected at the end of the sampling needle furthest from the gas bag valve. Valve A is located between the sampling needle and the sample tube, and valves B and C are located between the sample tube and the vacuum pump. When the sampling needle pierces the gas bag, opening valves A, B, and C allows for air extraction. Closing valve B allows the sampling operation to be completed under pressure differential when the sampling needle pierces the battery bulge. A sample injection mechanism is also located between valve B and the vacuum pump. Valve C is located between the vacuum pump and valve B. After sampling is completed in the sample tube, the vacuum pump evacuates the tubing on the side of valve B furthest from the sampling needle to the required vacuum level. Then, valve C is closed and valve B is opened, allowing the sample gas in the sample tube to flow to the sample injection mechanism under pressure differential, enabling quantitative injection into the gas chromatograph. Therefore, this automatic sampling and injection instrument for battery bulge gas can complete the entire process of sampling and injection of sample gas in sequence. The entire sampling and transfer process is completed by differential pressure and valve control, which avoids the contamination of sample gas that occurs during manual extraction and transfer, and helps to ensure the accuracy of the test results. When electric or pneumatic valves are selected for each valve, automated sampling and analysis can also be achieved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the structural principle of an automatic sampling and injection instrument for gas from a battery bulge, according to this utility model.

[0021] Figure 2 This is a schematic diagram of a product embodiment of the automatic sampling and injection instrument for gas from a battery bulge according to the present invention;

[0022] Figure 3 for Figure 2 The internal structure diagram of the embodiment shown is shown.

[0023] Figure 4 for Figure 2 The schematic diagram of the drive mechanism in the embodiment shown is as follows;

[0024] Figure 5 For Figure 2 Structure diagram of the air bag clamp in the embodiment shown in the figure;

[0025] Figure 6 For Figure 2 Structure diagram of the air bag valve in the embodiment shown in the figure;

[0026] In the figure, 1-air bag valve, 2-sampling needle, 3-vacuum pump, 4-sample tube, 5-valve A, 6-valve B, 7-sampling mechanism, 8-gas chromatograph, 9-valve C, 12-upper clamp plate, 13-lower clamp plate, 14-lock, 15-positioning groove, 16-positioning table, 17-first telescopic part, 18-second telescopic part. DETAILED DESCRIPTION

[0027] The technical scheme of the utility model will be described in further detail below in combination with the drawings, but the protection scope of the utility model is not limited to the following.

[0028] As Figures 1 to 6 A battery bulging gas automatic sampling and sampling instrument, comprising an air bag (not shown in the figure), an air bag valve 1, a sampling needle 2 and a driving mechanism. The air bag is a flexible soft bag used for containing and covering the battery to be detected, and a sealing clamp strip is arranged on the air bag for sealing the air bag after the battery is loaded. One end of the air bag valve 1 is connected with the air bag, and the front end of the sampling needle 2 is arranged opposite to the end of the air bag valve 1 away from the air bag, and the driving mechanism is used for driving the sampling needle 2 and the air bag valve 1 to approach or move away from each other. When the sampling needle 2 and the air bag valve 1 approach each other, the front end of the sampling needle 2 can pierce the air bag valve 1 and extend into the air bag, and when the sampling needle 2 and the air bag valve 1 continue to approach each other, the front end of the sampling needle 2 can pierce the air bag and the bulging part of the battery to be detected; when the sampling needle 2 and the air bag valve 1 move away from each other and separate, the air bag valve 1 can realize self-sealing.

[0029] One embodiment of the automatic sampling and injection instrument for the battery bulging gas is to connect the sampling needle 2 far away from the one end of the air bag to the suction device, and to place the battery to be detected in the air bag before sampling, and to make the bulging surface of the battery face the front end of the sampling needle 2 when placed, and then to seal the air bag. In the sampling, the sampling needle 2 and the air bag valve 1 are made close to each other by the driving mechanism, and the driving mechanism stops working when the front end of the sampling needle 2 penetrates the air bag valve 1 and extends into the air bag, at which time the air in the air bag is exhausted by the suction device, and the air bag wall is tightly wrapped on the battery; then the driving mechanism continues to drive the front end of the sampling needle 2 to penetrate into the bulging position of the battery to be detected in the air bag, at which time the battery bulging gas can be extracted by the suction device to complete the sampling. In the above process, since the battery sample is loaded in the air bag, the air outside the battery sample in the air bag is completely extracted before sampling, and the air bag and the air bag valve 1 play a role in isolating the air for the battery sample, which can effectively avoid the influence of the mixed air on the sampling precision during sampling.

[0030] The above air bag valve 1 has a self-sealing function, and the air bag valve 1 is selected as a hollow pipe, and a separation pad made of soft and elastic materials such as silica gel and rubber is arranged in the hollow pipe. When the sampling needle 2 and the air bag valve 1 are close to each other, the sampling needle 2 can penetrate the soft and elastic materials, and a seal can be formed on the outer wall of the sampling needle 2 under the characteristics of the soft and elastic materials during the penetration of the sampling needle 2, so as to isolate the air in front of the sampling needle 2 from the air behind the sampling needle 2; after the sampling is completed, the sample enters the sample tube 4 under the action of the pressure difference and is stored in the sample tube 4, and multiple injection analysis for the same battery can be realized, and the sample is not likely to be contaminated, and there is no need to worry about the accuracy of multiple parallel injections. Further, the side opening design of the sampling needle 2 is the most suitable, which can prevent the material fragments cut off by the sampling needle 2 from entering the sampling needle 2 and causing blockage when the sampling needle 2 penetrates the above soft and elastic materials, and the opening at the front end of the sampling needle 2 arranged on the side can also prevent the electrolyte in the battery sample from entering the sampling needle 2 and causing pollution when the sampling needle 2 penetrates the aluminum foil of the battery.

[0031] In the embodiment, the vacuum pump 3 and the sample tube 4 are also arranged, the rear end of the sampling needle 2 and the suction end of the vacuum pump 3 are communicated with the sample tube 4, the valve A 5 is arranged between the sampling needle 2 and the sample tube 4, and the valve B 6 is arranged between the sample tube 4 and the vacuum pump 3. In the foregoing use process, when the sampling needle 2 penetrates the air bag, the valve A 5 and the valve B 6 are opened, and the vacuum pump 3 is started to complete the foregoing process of extracting the air outside the battery in the air bag, and the air in the air bag, the connecting pipeline and the sample tube 4 is exhausted to form negative pressure during the extraction process; then the valve B 6 is closed to make the sampling needle 2 penetrate the bulging position of the battery, and the battery bulging gas can be introduced into the sample tube 4 to be collected under the action of the pressure difference; then the valve A 5 is closed to complete the sampling work of the sample tube 4.

[0032] Further, a sample injection mechanism 7 and a gas chromatograph 8 are provided, which are mature components in the field of gas analysis. In the present embodiment, the sample injection mechanism 7 can be a multi-way valve combined with a quantitative ring injector, which can achieve precise quantitative sampling. The sample injection mechanism 7 is connected between the valve B6 and the vacuum pump 3, and a valve C9 is further provided between the sample injection mechanism 7 and the vacuum pump 3. The sample injection mechanism 7 is connected to the gas chromatograph 8, and the gas flowing through the sample injection mechanism 7 can be quantitatively injected into the gas chromatograph 8. In the above-mentioned suction process, the valves A5, B6 and C9 are all opened to exhaust the air in the system pipeline. After the air is exhausted, the valve B6 is closed, and the sampling of the sample tube 4 is performed in the above-mentioned manner. After the sampling is completed, the vacuum pump 3 continues to work to suck the pipeline on the side away from the sampling needle 2 of the valve B6 to a set vacuum degree. Then, the valve C9 is closed and the valve B6 is opened, and the gas sample in the sample tube 4 flows to the sample injection mechanism 7 under the driving of pressure difference. Part of the sample gas can be quantitatively introduced into the gas chromatograph 8 for analysis through the sample injection mechanism 7. In the implementation, a pressure gauge is further provided on the pipeline between the valves B6 and C9 to record the pressure of the sample during the injection and analysis. Thus, the battery bulging gas automatic sampling and injection instrument can sequentially complete the sampling and injection of the sample gas. The whole sampling and transferring process is completed through the control of pressure difference and valves, which avoids the pollution of the sample gas in the manual extraction and transferring process, and is beneficial to ensure the accuracy of the detection results. It should be understood that, in the implementation, the valves A5, B6 and C9 are all electrically or pneumatically controlled valves, and a controller is provided to electrically connect the valves A5, B6 and C9, the driving mechanism, the vacuum pump 3 and the sample injection mechanism 7 to the controller. The automatic sampling and analysis of the bulging gas can be realized after the battery is loaded.

[0033] As shown in the embodiment of the present application: Figures 2 to 6 In the specific implementation of the embodiment of the present application:

[0034] A gas bag clamp is further provided, which includes an upper clamp plate 12, a lower clamp plate 13 and a lock 14. The upper clamp plate 12 and the lower clamp plate 13 are rotatably connected, and the upper clamp plate 12 and the lower clamp plate 13 form a clamping hole when they are folded. The lock 14 is used to fix the upper clamp plate 12 and the lower clamp plate 13 when they are folded. After the battery is loaded into the gas bag, the gas bag valve is arranged in the clamping hole, and the upper clamp plate 13 and the lower clamp plate 14 are buckled to complete the sample loading, which is convenient to operate.

[0035] A positioning groove 15 is formed in the circumferential position of the clamping hole, and a positioning platform 16 is arranged on the circumference of the valve. When loading the sample, the positioning platform 16 is fitted into the positioning groove 15 in a clamping manner. This arrangement provides a counterforce, so that the sampling needle 2 can smoothly penetrate into the valve to complete the air discharge in the bag and the sampling operation of the battery bulge gas. On the other hand, the positioning platform 16 can complete the positioning when loading the sample, so as to ensure that the battery bulge surface is opposite to the front end of the sampling needle 2 after loading, and facilitate the determination of the penetration distance of the sampling needle 2.

[0036] A body is further provided. The aforementioned driving mechanism includes a first telescopic component 17 and a second telescopic component 18. The sampling needle 2 and the first telescopic component 17 are fixedly installed on the body. The extended end of the first telescopic component 17 is fixedly connected with the second telescopic component 18. The extended end of the second telescopic component 18 is fixedly connected with the lower clamping plate 13. The first telescopic component 17 and the second telescopic component 18 can be selected from various structural forms such as air cylinders and linear motors. Here, the sampling needle 2 is relatively fixed. The telescopic movement of the two telescopic components can drive the lower clamping plate 13 to move. That is, the sampling needle 2 and the valve can be moved close to or away from each other after the lower clamping plate 13 (the bag clamp) loads the sample. It should be understood that in other embodiments, the valve can also be relatively fixed. The sampling needle 2 can also be driven to move by the driving mechanism to achieve the function. In addition, the structure of the two telescopic components is provided here. The penetration of the sampling needle 2 into the bag and the penetration of the sampling needle 2 into the battery bulge can be achieved by controlling the stroke of the first telescopic component 17 and the second telescopic component 18, respectively. It should be understood that in other embodiments, other driving forms can also be selected to complete the above-mentioned action control.

[0037] In general, the overall use process of the battery bulge gas automatic sampling and sampling instrument is as follows:

[0038] S1, load the sample into the bag and seal the bag. Clamp the valve 1 to the bag clamp.

[0039] S2, drive the bag clamp to retreat by the first telescopic component 17, so that the valve 1 moves to the front end of the sampling needle 2 and penetrates into the bag.

[0040] S3, the valves A5, B6 and C9 are in the open state. Start the vacuum pump 3 to exhaust the air outside the battery in the bag and the air in the intermediate pipeline until the air is exhausted. Then, close the valve B6.

[0041] S4, drive the bag clamp to retreat further by the second telescopic component 18, so that the sampling needle 2 penetrates into the battery bulge position. At this time, the battery bulge gas flows into the sample tube 4 under the action of pressure difference. Then, close the valve A5. At the same time, the vacuum pump 3 continues to suck until the pipeline on the side away from the sampling needle 3 reaches the set vacuum degree requirement. Then, close the valve C9.

[0042] S5, opening the valve B6, the sample gas in the sample tube 4 flows through the sample inlet mechanism 7 position under the action of pressure difference.

[0043] S6, the sample gas is introduced into the gas chromatograph through the sample inlet mechanism 7 for analysis.

[0044] The above only is the preferred embodiment of the present application, it should be understood that the present application is not limited to the form disclosed herein, should not be considered as excluding other embodiments, and can be used in various other combinations, modifications and environment, and can be within the scope of the concept described herein, by the above teaching or related art or knowledge to make changes. And the personnel of the present application make changes and variations without departing from the spirit and scope of the present application, then all should be within the scope of the claims of the present application.

Claims

1. An automatic sampling and injection instrument for gas from a bulging battery, characterized in that, Includes air bag, air bag valve, sampling needle, and drive mechanism. The air bag is used to enclose the battery to be tested. One end of the air bag valve is connected to the air bag, and the tip of the sampling needle is positioned opposite the end of the air bag valve that is furthest from the air bag. The driving mechanism is used to drive the sampling needle and the air bag valve to move closer or further apart. When the sampling needle and the air bag valve move closer together, the tip of the sampling needle can pierce the air bag valve and extend into the air bag, and can also pierce the bulge of the battery to be tested inside the air bag. When the sampling needle and the air bag valve move further apart, the air bag valve can achieve self-sealing.

2. The automatic sampling and injection instrument for gas from a battery bulge according to claim 1, characterized in that, It also includes a vacuum pump and a sample tube. The rear end of the sampling needle and the suction end of the vacuum pump are both connected to the sample tube. A valve A is provided between the sampling needle and the sample tube, and a valve B is provided between the sample tube and the vacuum pump.

3. The automatic sampling and injection instrument for gas from a battery bulge according to claim 2, characterized in that, It also includes an injection mechanism and a gas chromatograph. The injection mechanism is connected between the valve B and the vacuum pump. A valve C is also provided between the injection mechanism and the vacuum pump. The injection mechanism is connected to the gas chromatograph. The injection mechanism is used to quantitatively inject gas into the gas chromatograph.

4. The automatic sampling and injection instrument for gas from a battery bulge according to claim 1, characterized in that, It also includes an air bag clamp, which includes an upper clamp, a lower clamp, and a latch. The upper clamp and the lower clamp are rotatably connected. When the upper clamp and the lower clamp are closed, they form a clamping hole. The air bag valve passes through the clamping hole. The latch is used to fix the upper clamp and the lower clamp when they are closed.

5. The automatic sampling and injection instrument for gas from a battery bulge according to claim 4, characterized in that, The clamping hole is machined with a positioning groove in the circumferential direction, and the air bag valve is provided with a positioning platform in the circumferential direction. The positioning platform is adapted to be installed in the positioning groove.

6. An automatic sampling and injection instrument for gas from a battery bulge according to claim 4 or 5, characterized in that, It also includes a body, and the driving mechanism includes a first telescopic component and a second telescopic component. The sampling needle and the first telescopic component are both fixedly installed on the body. The protruding end of the first telescopic component is fixedly connected to the second telescopic component, and the protruding end of the second telescopic component is fixedly connected to the lower clamping plate.

7. The automatic sampling and injection instrument for gas from a battery bulge according to claim 1, characterized in that, The air bag valve is made of a soft and elastic material, or the air bag valve is provided with a septum made of a soft and elastic material.

8. The automatic sampling and injection instrument for gas from a battery bulge according to claim 7, characterized in that, The sampling needle has a side opening design, and the air bag is equipped with a sealing strip.

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