Gas production testing device

Abstract

The invention relates to a gas production testing device which comprises a heating barrel, a testing gas bag, a hanging rope, a balance weight, a pressing plate, a weighing sensor, a sealing box, a data display device and data collection software, the heating barrel is filled with liquid, the balance weight is hung below the testing gas bag, and the testing gas bag and the balance weight are hung in the heating barrel and immersed in the liquid; the pressing plate and the weighing sensor are located above the heating barrel, the pressing plate is pressed on the weighing sensor, one end of the hanging rope is connected with the pressing plate, and the other end of the hanging rope is connected with the upper part of the test air bag; the weighing sensor is in wireless or wired connection with the data processing device and is used for transmitting data; the heating barrel, the pressing plate and the weighing sensor are all located in the sealing box.

Description

Technical Field

[0001] The present invention relates to the technical field of testing devices, and particularly relates to a material gas generation testing device. Background Art

[0002] With the emergence of anode materials, especially silicon-based anode materials, it is necessary to test the gas generation amount of materials within a fixed time (such as 24 hours, 48 hours) and under specific temperature conditions (such as the gas amount produced per gram of material), so as to evaluate whether the material generates gas or the quality of material particle coating. CN117969342A discloses a gas measuring device, which mainly includes a suspension rod, a balance weighing mechanism and a test gas bag. When the test gas bag generates gas during the reaction, its volume increases and the buoyancy increases, and the force on the base located in the first wind shield changes, thereby changing the reading of the balance. This mechanism has the following problems: (1) It is necessary to separately set a first wind shield to surround the base and the suspension rod, and then set a second wind shield outside to surround the whole system to prevent the influence of wind, and the structure is relatively complex; (2) Since one end of the suspension rod is also connected with a disc-shaped base, it is not convenient to operate when placing the suspension rod in the first wind shield; (3) In terms of weighing accuracy, it mainly depends on the elastic deformation of the suspension rod. The suspension rod has no intermediate support point, and does not use the lever principle to transmit force, but depends on the elastic deformation of the suspension rod. During the gas generation process, the gas output is not linearly changed. For the changing force on the right side of the suspension rod, the elastic deformation point of the suspension rod is not determined. For example, when the right side is very heavy, the fulcrum position of the suspension rod deformation may be mainly at the right-angle turning point of the suspension rod, and when the right side is lighter, the bending of the suspension rod may occur in the horizontal part and can bear it. For a long reaction time and a long data collection interval, the underlying logic of the weight values recorded at intervals is different, and thus the calculated exhaust gas volume through its formula is not accurate. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a gas generation testing device, including a heating barrel, a test gas bag, a hanging rope, a counterweight, a pressing plate, a weighing sensor, a sealed box, and a data processing device.

[0004] The heating barrel is filled with liquid, the counterweight is suspended below the test gas bag, and the test gas bag and the counterweight are suspended in the heating barrel and immersed in the liquid; the pressing plate and the weighing sensor are located above the heating barrel, the pressing plate presses on the weighing sensor, one end of the hanging rope is connected to the pressing plate, and the other end is connected to the upper part of the test gas bag; the weighing sensor is wirelessly or wiredly connected to the data processing device for transmitting data.

[0005] The heating barrel, the pressing plate, and the weighing sensor are all located in the sealed box.

[0006] Further, the gas production testing device further includes a support frame. The upper part of the support frame has a support plate, and the weighing sensor is placed on the support plate. One or more through holes for the hanging ropes to pass through are provided on the support plate, and the hanging ropes pass through the through holes. The support frame is located inside the sealed box.

[0007] Further, the gas production testing device further includes a hanging rod. The pressing plate is connected to the hanging rod through two hanging ropes, and the test gas bag is connected to the middle of the hanging rod through one hanging rope.

[0008] Further, the weighing sensor is a pressure-sensitive weighing sensor.

[0009] Further, the data processing device is located inside the sealed box or placed outside the sealed box.

[0010] Further, the data processing device regularly records the measurement data of the weighing sensor and displays it.

[0011] Further, the data processing device automatically calculates the gas production according to the following formula:

[0012] Further, the data processing device automatically calculates the gas production according to the following formula:

[0013] dV 排 / dt = -1 / ρg * dM / dt, where ρ is the density of the liquid in the heating barrel, g is the acceleration due to gravity, M is the mass measured by the weighing sensor, t is time, and dV 排 / dt represents the change in the volume of the test gas bag due to gas production. By calculating the numerical integration of dV 排 / dt with respect to time, the gas production is obtained.

[0014] In the present invention, arranging the weighing sensor above the test gas bag is beneficial to the integration of the system. Compared with the prior art, multiple sealed boxes are not required, and the structure is simple, facilitating the conduct of experiments. Secondly, the entire force on the test gas bag and the weighing sensor is in the vertical direction, without the problem of the self-deformation of the hanging rod in the prior art, with higher measurement accuracy, a simpler physical principle, convenient calculation, and the ability to quickly obtain the gas production data per unit mass. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the gas measurement device;

[0016] Figure 2 is a schematic structural diagram of the support plate;

[0017] Figure 3 is the force analysis Figure 1 ;

[0018] Figure 4 is the force analysis Figure 2 ;

[0019] Figure 5 is the graph of the weighing weight changing with time;

[0020] Figure 6 is the graph of the gas production changing with time;

[0021] Figure 7 is the graph of the gas production per unit mass changing with time. Specific embodiments

[0022] Refer to Figure 1 - Figure 2 , the gas measurement device of the present invention includes a heating barrel 1, a test gas bag 2, a hanging rope 3, a counterweight 4, a pressing plate 5, a weighing sensor 6, a weighing display 7, and a sealing box 8.

[0023] The heating barrel 1 is filled with liquid, the counterweight 4 is suspended below the test gas bag 2, and the test gas bag 2 and the counterweight 4 are suspended in the heating barrel 1 and immersed in the liquid.

[0024] The pressing plate 5 and the weighing sensor 6 are located above the heating barrel 1, the pressing plate 5 presses on the weighing sensor 6, one end of the hanging rope 3 is connected to the pressing plate 5, and the other end is connected to the upper part of the test gas bag 2. As a preferred method, in Figure 1 , in order to maintain stability, a hanging rod 9 is also provided. The pressing plate 5 is connected to the hanging rod 9 through two hanging ropes, and the test gas bag 2 is connected to the middle of the hanging rod 9 through one hanging rope. The weighing display 7 is connected to the weighing sensor 6 and is used to display its weight reading.

[0025] The gas measurement device also includes a support frame 10. The upper part of the support frame 10 has a support plate 11, and the weighing sensor 6 is placed on the support plate 11. One or more through holes 12 are provided on the support plate 11, and the hanging rope of the pressing plate 5 passes through the through holes 12 and is connected to the test gas bag 2 or the hanging rod 9 below.

[0026] The heating barrel 1, the support frame 10, the pressing plate 5, the weighing sensor 6, and the weighing display 7 are all located in the sealing box 8. Those skilled in the art can understand that since data is transmitted between the weighing display 7 and the weighing sensor 6 through a data cable, the weighing display 7 can also be set outside the sealing box 8, which can also ensure a good sealing effect. Or the weighing display 7 and the weighing sensor 6 transmit data in a wireless transmission form, which can further reduce the volume of the sealing box 8 and make the structure more compact. Moreover, the weighing display 7 can also be replaced by a data processing device, which automatically records data and performs analysis, and can also display data or analysis results.

[0027] Refer toFigure 3 - Figure 4 , to explain the principle of the present invention, a force analysis is carried out. Figure 3 In, the object of analysis is the whole composed of the test airbag 2, the hanging rope 3, and the counterweight 4. This whole includes the upward pulling force F of the hanging rope 3, the overall gravity G of the counterweight, the hanging rope 3, and the test airbag 2, and the buoyancy ρgV 排 , where ρ is the density of the liquid and g is the acceleration due to gravity. Therefore, we have: F + ρgV 排 = G, where G is a constant value. In this force analysis, if there is a hanging rod 9, it is simplified as a part of the hanging rope.

[0028] Figure 4 In, a force analysis is carried out on the pressing plate 5. The forces it receives include the supporting force M provided by the weighing sensor 6, its own gravity G1 (constant value), and the downward pulling force F' of the hanging rope 3. Therefore, we have F' + G1 = M. Since F = F', we have:

[0029] G - ρgV 排 = M - G1, then the supporting force M = -ρgV 排 + G - G1.

[0030] Since G - G1, ρ, and g are all constants, we have

[0031] dV 排 / dt = -1 / ρg * dM / dt. By performing definite integration on the above formula, the volume change of the final test airbag 2 can be obtained, and thus the gas production can be obtained. Among them, the supporting force M can be displayed by the weighing display 7, and data can be obtained through measurements at multiple time points.

[0032] In the present invention, since the gravity of the counterweight and the test airbag itself is greater than its buoyancy, the pressing plate 5 always adheres to the weighing sensor 6. The weighing sensor is a pressure-sensitive weighing sensor, and the pressure-sensitive weighing sensor has a strain gauge. When a force is applied, the strain gauge deforms, and the strain gauge attached to it also deforms, resulting in a change in resistance. By measuring the change in resistance, the magnitude of the force can be calculated. Therefore, even if the test airbag 2 moves upward under the action of buoyancy, it can be ensured that the pressing plate 5 always adheres to the weighing sensor 6.

[0033] Secondly, starting from the measurement principle, by setting a reasonable counterweight, the test airbag is always immersed in the liquid in the heating tank, which is also a basic technical requirement well-known to those skilled in the art. Theoretically, the above V 排It includes the volume of the counterweight, the volume of the test airbag 2, and the volume of the part of the hanging rope in the liquid. During the process of the test airbag generating gas, the airbag will move slightly upward, and the length of the hanging rope immersed in water will also become shorter. However, the diameter of the hanging rope is very small (less than 1 mm), and the change in length during the entire test is less than 10 cm. Moreover, due to the large expansion amplitude of the airbag to both sides during the expansion process, the change in the volume of the hanging rope immersed in the liquid is almost negligible compared to the change in the volume of the airbag. For example, when calculated with a diameter of 1 mm and a length change of 10 cm, the volume change of the hanging rope is approximately 0.0785 ml. When the final gas production is about 3 ml, the influence ratio of the hanging rope volume is 2.6%. In addition, during the reaction process, a small amount of liquid will adhere to the part of the hanging rope that is out of the liquid surface, increasing the weight of the hanging rope and also offsetting the reduction in buoyancy, further reducing the influence of the change in the hanging rope volume on buoyancy. Thus, dV 排 / dt can represent the change in the volume of the test airbag due to gas production, and in fact, it characterizes the gas production rate.

[0034] See Figure 5 - Figure 7 , which are the data during the experiment of a certain sample. It can be seen that as the gas reaction proceeds, the buoyancy of the test airbag 2 gradually increases. Therefore, the weight measured by the weighing display 7 gradually decreases. Through numerical integration calculation, the gas production volume (ml) is obtained, and it gradually increases. Then, dividing the gas production volume (ml) by the sample material mass (4 g) can obtain the relationship between the final gas production volume (ml / g) and time ( Figure 7 ).

[0035] In the present invention, arranging the weighing sensor 6 above the test airbag 2 is beneficial to the integration of the system. Compared with the prior art, it does not require multiple sealed boxes, and the structure is simple, facilitating the experiment. Secondly, the entire force on the test airbag and the weighing sensor 6 is all in the vertical direction, without the problem of the self-deformation of the suspension rod in the prior art, with higher measurement accuracy, simpler physical principles, convenient calculation, and the gas production data per unit mass can be obtained quickly.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas production test device, comprising a heating barrel (1), a test gas bag (2), a hanging rope (3), a counterweight (4), a pressing plate (5), a weighing sensor (6), a sealing box (8), and a data processing device, characterized in that: The heating barrel (1) is filled with liquid, the counterweight (4) is suspended below the test air bag (2), the test air bag (2) and the counterweight (4) are suspended in the heating barrel (1) and immersed in the liquid; the pressing plate (5) and the weighing sensor (6) are located above the heating barrel (1), the pressing plate (5) is pressed on the weighing sensor (6), one end of the hanging rope (3) is connected to the pressing plate (5), and the other end is connected to the upper part of the test air bag (2); the weighing sensor (6) is wirelessly or wiredly connected to the data processing device for transmitting data; The heating barrel (1), the pressing plate (5), and the weighing sensor (6) are all located in the sealed box (8).

2. The gas production testing device according to claim 1, characterized in that: The gas production test device further comprises a support frame (10), the upper portion of the support frame (10) having a support plate (11), the weighing sensor (6) being placed on the support plate (11), the support plate (11) being provided with one or more through holes (12) for the hanging rope (3) to pass through, the hanging rope (3) passing through the through holes (12), and the support frame (10) being located in the sealing box (8).

3. The gas production testing device according to claim 1 or 2, characterized in that: The gas production test device further comprises a hanging rod (9), the pressing plate (5) is connected to the hanging rod (9) via two hanging ropes, and the test air bag (2) is connected to the middle part of the hanging rod (9) via a hanging rope.

4. The gas production testing device according to claim 1 or 2, characterized in that: The weighing sensor (6) is a pressure-sensitive weighing sensor.

5. The gas production testing device according to claim 1 or 2, characterized in that: The data processing device is located inside the sealed box (8) or outside the sealed box (8).

6. The gas production testing device according to claim 1 or 2, characterized in that: The data processing device regularly records the measurement data of the weighing sensor and displays it.

7. The gas production testing device according to claim 6, characterized in that: The data processing device automatically calculates the gas production according to the following formula: dV 排 / dt=-1 / ρg*dM / dt, where ρ is the density of the liquid in the heating barrel, g is the acceleration of gravity, M is the mass measured by the weighing sensor, t is the time, dV 排 / dt represents the change in the volume of the test air bag due to gas production, which is calculated by dV 排 The gas production is obtained by numerically integrating / dt with respect to time.

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