Electrolyte flame retardant property testing device

Abstract

The utility model discloses a device for testing the flame retardant property of electrolyte, which relates to the field of electrolyte property testing, and comprises gas supply bins and combustion bins which are the same in quantity, pistons are connected in the gas supply bins in a sliding manner, the pistons divide the inner cavities of the gas supply bins into two mutually independent cavities, namely atmosphere parts and oxygen parts, the atmosphere parts are communicated with the external environment, and the oxygen parts are communicated with the combustion bins. The oxygen part is communicated with an inner cavity of the combustion bin through a pipeline, a container used for containing electrolyte is arranged at the bottom of the inner cavity of the combustion bin, an inserting rod is assembled over the container in a sliding mode in the vertical direction, and a testing column used for adsorbing the electrolyte is installed at the end, close to the container, of the inserting rod; a combustion part for igniting the test column is mounted on the side wall of the inner cavity of the combustion bin; the inserting rod is of a rotatable structure. According to the whole device, the spin-drying action of the test column before ignition and uniform combustion during ignition are achieved through the rotatable inserting rod, the reliability of electrolyte flame retardant performance testing is improved, the structure is simple, operation is convenient and fast, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the field of electrolyte performance testing, in particular to a device for testing the flame retardancy performance of electrolytes. Background Technique

[0002] There is a high reactivity between the electrolyte and the positive and negative electrodes. Especially at high temperatures, in order to improve the safety of the battery, improving the safety of the electrolyte is one of the more effective methods. The research on the safety performance of the electrolyte mainly considers the flame retardancy of the electrolyte under abnormal battery use conditions.

[0003] When conducting the flame retardancy test of the electrolyte, generally a test column is used to adsorb the electrolyte. When being ignited, the electrolyte adsorbed on the surface of the test column will drip downward under the action of gravity, affecting the ignition quality, and the flame spraying area is always in the same position, resulting in uneven ignition of the test column. For example, the Chinese patent with the publication number CN209372784U discloses a device for testing the flame retardancy performance of lithium battery electrolytes. It ignites the test column adsorbed with the electrolyte, and then judges the quality of the flame retardancy performance of the electrolyte by observing matters such as the burning time of the test column. In this test process, if the test column burns unevenly, it may affect the length of the burning time. Therefore, we propose a device for testing the flame retardancy performance of electrolytes. Content of the Utility Model

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the utility model provides a device for testing the flame retardancy performance of electrolytes.

[0005] To achieve the above object, the utility model provides the following technical solution: A device for testing the flame retardancy performance of electrolytes, including an equal number of air supply chambers and combustion chambers. A piston is slidably connected inside the air supply chamber. The piston divides the inner cavity of the air supply chamber into two independent chambers, namely an atmosphere part and an oxygen part. The atmosphere part communicates with the external environment, and the oxygen part communicates with the inner cavity of the combustion chamber through a pipeline. A container for holding the electrolyte is arranged at the bottom of the inner cavity of the combustion chamber. A plugging rod is slidably assembled vertically above the container. A test column for adsorbing the electrolyte is installed at one end of the plugging rod close to the container. A combustion component for igniting the test column is installed on the side wall of the inner cavity of the combustion chamber; the plugging rod is a rotatable structure.

[0006] Preferably, an installation frame is erected above the combustion chamber. An electric cylinder is installed at the upper end of the installation frame. The piston rod of the electric cylinder penetrates through the installation frame and is fixedly installed with an installation plate. The plugging rod is installed on the installation plate. The installation plate is slidably assembled vertically in the installation frame.

[0007] Preferably, the plugging rod includes a rod portion arranged in the vertical direction. The rod portion is sleeved on the mounting plate through a bearing. A guiding protrusion distributed radially along it is installed at the top of the outer circumferential surface of the rod portion. A guiding cylinder is arranged directly above the plugging rod. The leading end of the guiding protrusion is movably sleeved in the inner cavity of the guiding cylinder. The guiding cylinder is fixedly installed on the mounting frame. A spiral guiding groove is formed on the outer circumferential surface of the guiding cylinder. The guiding cylinder is slidably assembled in the spiral guiding groove.

[0008] Preferably, a limiting disc is installed at the end of the rod portion. A pointed head portion is installed at the lower end of the limiting disc. The test column is plugged on the pointed head portion.

[0009] Preferably, the number of spiral turns of the spiral guiding groove is at least more than two.

[0010] Preferably, a reflux baffle plate in a funnel-shaped structure is installed inside the combustion chamber. A through hole with a radius larger than the radius of the test column is formed at the center of the reflux baffle plate.

[0011] Preferably, the oxygen part and the combustion chamber are communicated through an oxygen outlet pipe. A valve II is installed on the oxygen outlet pipe.

[0012] Preferably, the oxygen part is communicated with an external oxygen supply device through an oxygen inlet pipe. A valve I is installed on the oxygen inlet pipe.

[0013] Preferably, adjacent combustion chambers are communicated through a connecting pipe. A connecting valve is installed on the connecting pipe.

[0014] Compared with the prior art, the utility model provides an electrolyte flame retardancy performance testing device, which has the following beneficial effects:

[0015] (1) By providing a rotatable plugging rod for placing the test column, before the test column is ignited, the electrolyte adhered to its surface can be quickly dripped by quickly rotating the test column, reducing the influence on subsequent ignition; when the test column is ignited, by slowly rotating the test column, the test column can be fully contacted with the flame, improving the uniformity of ignition of the test column.

[0016] (2) Using the linear motion of the test column to reset after being infiltrated with the electrolyte as the power source, and cooperating with the guiding cylinder and the spiral guiding groove to realize the rotation of the test column, not only saves the manufacturing cost, but also improves the coherence between the two steps.

[0017] (3) Converting the flame retardancy test of the electrolyte into the consumption of oxygen, the quality of the flame retardancy performance of the electrolyte can be directly obtained, improving the practicability.

[0018] (4) By providing a connecting pipe and a connecting valve, multiple combustion chambers can be paired with a single gas supply chamber, and the oxygen consumption of three test columns can be obtained, which can be used to corroborate the oxygen consumption of a single test column, improving the reliability of the test data. Description of the Drawings

[0019] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the accompanying drawings:

[0020] Figure 1 It is a schematic structural diagram of the entire electrolyte flame retardancy testing device in the embodiment;

[0021] Figure 2 It is a schematic distribution diagram of each structure on the insertion rod in the embodiment;

[0022] Figure 3 It is a schematic structural diagram of the guiding cylinder in the embodiment;

[0023] Figure 4 It is a partially sectional schematic diagram of the air supply chamber in the embodiment;

[0024] Figure 5 It is a partially sectional schematic diagram of the combustion chamber in the embodiment.

[0025] In the figure: 1. Air supply chamber; 2. Piston; 21. Limit ring; 22. Scale line; 3. Atmosphere part; 4. Oxygen part; 41. Oxygen inlet pipe; 42. Valve I; 43. Oxygen outlet pipe; 44. Valve II; 5. Combustion chamber; 51. Return baffle; 52. Through hole; 53. Limit ring; 6. Container; 7. Insertion rod; 71. Rod part; 72. Limit disc; 73. Tip part; 74. Guide protrusion; 75. Guiding cylinder; 76. Spiral guiding groove; 8. Combustion component; 9. Mounting frame; 10. Electric cylinder; 11. Mounting plate; 12. Test column; 13. Connecting pipe; 14. Connecting valve. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0027] This embodiment provides an electrolyte flame retardancy testing device, as Figures 1 to 5As shown in the figure, there are the same number of air supply chambers 1 and combustion chambers 5. In this embodiment, three groups of air supply chambers 1 and combustion chambers 5 are provided. A piston 2 is slidably connected inside the air supply chamber 1. The piston 2 divides the inner cavity of the air supply chamber 1 into two independent chambers, an atmosphere part 3 and an oxygen part 4. The atmosphere part 3 communicates with the external environment, and the oxygen part 4 communicates with the inner cavity of the combustion chamber 5 through a pipeline. At the bottom of the inner cavity of the combustion chamber 5, there is a container 6 for holding electrolyte. A plugging rod 7 is slidably assembled vertically above the container 6. At one end of the plugging rod 7 close to the container 6, there is a test column 12 for adsorbing electrolyte. On the side wall of the inner cavity of the combustion chamber 5, there is a combustion component 8 for igniting the test column 12; Before the test, oxygen is injected into the oxygen part 4. As the gas volume increases, the piston 2 moves upward in the vertical direction, and the position where it stops is defined as the initial position; After the test column 12 is ignited, the gas volume in the oxygen part 4 decreases as the combustion proceeds. Under the action of the external atmospheric pressure, the piston 2 moves downward in the vertical direction. By observing the distance difference of the piston 2 relative to the initial position, the oxygen consumption in the oxygen part 4 can be judged, and then the flame retardant effect of the electrolyte can be judged. That is, the better the flame retardant effect, the less the oxygen consumption. It should be noted that a sealing door is provided on the combustion chamber 5 to facilitate subsequent replacement of the electrolyte and the test column.

[0028] Before the test column 12 is ignited, the test column 12 needs to be immersed in the electrolyte to fully adsorb the electrolyte. Specifically, an installation frame 9 is erected above the combustion chamber 5. An electric cylinder 10 is installed at the upper end of the installation frame 9. The piston rod of the electric cylinder 10 penetrates through the installation frame 9 and is fixedly installed with an installation plate 11. The plugging rod 7 is installed on the installation plate 11. The installation plate 11 is slidably assembled in the installation frame 9 in the vertical direction. By extending the piston rod of the electric cylinder 10, the test column 12 is driven into the electrolyte. After soaking for a period of time, the piston rod of the electric cylinder 10 contracts to drive the test column 12 to reset. At this time, the test column 12 is just aligned with the flame outlet of the combustion component 8. The combustion component 8 is started, and the flame outlet sprays out flames to complete the ignition operation of the test column 12.

[0029] Generally, in order to quickly realize the ignition operation of the test column 12, the flame outlet of the combustion component 8 is just aligned with the end of the test column 12, so that the test column 12 is in full contact with the flame. However, in this process, since the contact position between the flame and the test column 12 remains unchanged, the test column 12 burns unevenly, affecting the accuracy of the subsequent oxygen consumption test. Therefore, we design the plugging rod 7 as a rotatable structure. During the reset process of the test column 12, when the head of the test column 12 contacts the flame outlet, the combustion component 8 starts to operate. Subsequently, the plugging rod 7 drives the test column 12 to slowly rotate in one direction, increasing the contact area between the flame and the test column 12, and achieving the purpose of uniform heating of the test column 12.

[0030] Specifically, the plugging rod 7 includes a rod portion 71 arranged in the vertical direction. The rod portion 71 is sleeved on the mounting plate 11 through a bearing. A guiding protrusion 74 distributed radially along it is installed at the top of the outer circumferential surface of the rod portion 71. A guiding cylinder 75 is arranged directly above the plugging rod 7. The leading end of the guiding protrusion 74 is movably sleeved in the inner cavity of the guiding cylinder 75. The guiding cylinder 75 is fixedly installed on the mounting frame 9. A spiral guiding groove 76 is formed on the outer circumferential surface of the guiding cylinder 75. The guiding cylinder 75 is slidably assembled in the spiral guiding groove 76. When the plugging rod 7 drives the test column 12 to move upward and reset, the guiding protrusion 74 moves along the spiral guiding groove 76, causing the rod portion 71 to rotate. In addition, in this embodiment, a limiting disc 72 is installed at the end of the rod portion 71, and a pointed head portion 73 is installed at the lower end of the limiting disc 72. The test column 12 is plugged on the pointed head portion 73. When placing the test column 12, it is necessary to ensure that the test column 12 is in close contact with the limiting disc 72, so that the position where each test column 12 contacts the flame is the same, improving the accuracy of the test. On the other hand, the flame is blocked by the limiting disc 72, reducing the probability of damage to the rod portion 71.

[0031] In addition, during the reset process of the test column 12, since the electrolyte adsorbed on the surface of the test column 12 will drip downward, in order to avoid the dripping electrolyte affecting the subsequent combustion, before the test column 12 burns, the plugging rod 7 can be rotated quickly for one week, and the centrifugal force generated by the rapid rotation is used to make the electrolyte adhering to the surface of the test column 12 drip quickly. After the test column 12 rotates for one week, the combustion component 8 starts again to complete the ignition operation of the test column 12. Therefore, the number of spiral turns of the spiral guiding groove 76 is at least greater than two.

[0032] On the basis of the above solution, the electrolyte quickly shed by the centrifugal force will splash in all directions. In order to collect this part of the electrolyte, a reflux baffle 51 in the shape of a funnel is installed inside the combustion chamber 5. A through hole 52 with a radius larger than the radius of the test column 12 is opened at the center of the reflux baffle 51. The splashed electrolyte converges to the through hole 52 along the inclined surface of the reflux baffle 51 and finally drips into the container 6 entirely.

[0033] In order to ensure that the electrolyte flowing through the through hole 52 just enters the container 6, a limiting ring 53 adapted to the container 6 is installed at the bottom of the inner cavity of the combustion chamber 5. The container 6 is placed inside the limiting ring 53 to play a role in limiting the container 6.

[0034] When the test column 12 is ignited, if the oxygen part 4 is always in communication with the combustion chamber 5, it may cause the flame to directly enter the oxygen part 4, thus posing a safety hazard. Therefore, in this embodiment, the oxygen part 4 and the combustion chamber 5 are connected through an oxygen outlet pipe 43, and a second valve 44 is installed on the oxygen outlet pipe 43. When the test column 12 is ignited, the second valve 44 is in a closed state. The test column 12 uses the oxygen in the combustion chamber 5 to form combustion. After ignition, the second valve 44 is opened, and then the oxygen in the oxygen part 4 is consumed to maintain the combustion state.

[0035] In this embodiment, the oxygen part 4 is in communication with an external oxygen supply device through an oxygen inlet pipe 41, and a first valve 42 is installed on the oxygen inlet pipe 41. Oxygen is supplied into the oxygen part 4 through the external oxygen supply device, increasing the gas volume in the oxygen part 4, and then causing the piston 2 to move to the initial position.

[0036] In addition, to facilitate observing the movement stroke of the piston 2, in this embodiment, scale lines 22 are installed on the outer circumferential surface of the air supply chamber 1. The movement stroke of the piston 2 can be calculated by observing the scales on the scale lines 22, and the air supply chamber 1 is made of a transparent material; to limit the movement stroke of the piston 2, a 21 is installed on the inner wall of the oxygen part 4, and 21 is located below the piston 2. When the piston 2 contacts 21, the piston 2 descends to the maximum stroke.

[0037] The electrolyte flame retardancy performance test device proposed in this embodiment can be applied to the performance flame retardancy tests of multiple electrolytes simultaneously. By comparing the movement strokes of the pistons 2 in each air supply chamber 1, it can be known which electrolyte has better or worse flame retardancy performance.

[0038] The electrolyte flame retardancy performance test device proposed in this embodiment can also be applied to the comprehensive performance flame retardancy test of one electrolyte. Generally, during the test, to improve the reliability of relevant data, multiple tests are required. In this embodiment, adjacent combustion chambers 5 are connected through a connecting pipe 13, and a connecting valve 14 is installed on the connecting pipe 13. When conducting the test, first, all the connecting valves 14 are closed, and the movement strokes of the pistons 2 in each air supply chamber 1 are respectively recorded to obtain the first set of data; then, one connecting valve 14 is opened, the remaining connecting valves 14 are closed, and the corresponding second valves 44 are closed, so that all the test columns 12 consume the oxygen in one oxygen part 4, and the movement strokes of the pistons 2 in the oxygen-consuming group are recorded to obtain the second set of data. By mutually corroborating the two sets of data, the reliability of the test data is improved.

[0039] In the description of the present utility model, the terms "first", "second", "another", and "yet another" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0040] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0041] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. Electrolyte flame retardancy test device, including the same number of gas supply chambers (1) and combustion chambers (5), characterized in that: A piston (2) is slidably connected inside the air supply chamber (1). The piston (2) divides the inner cavity of the air supply chamber (1) into two independent chambers, namely an atmosphere part (3) and an oxygen part (4). The atmosphere part (3) communicates with the external environment, and the oxygen part (4) communicates with the inner cavity of the combustion chamber (5) through a pipeline. At the bottom of the inner cavity of the combustion chamber (5), there is a container (6) for holding electrolyte. A plugging rod (7) is slidably assembled vertically above the container (6). At one end of the plugging rod (7) close to the container (6), there is a test column (12) for adsorbing electrolyte. On the inner cavity side wall of the combustion chamber (5), there is a combustion component (8) for igniting the test column (12); the plugging rod (7) is a rotatable structure.

2. The electrolyte flame retardancy performance testing device according to claim 1, wherein: Above the combustion chamber (5), there is an installation frame (9) erected. At the upper end of the installation frame (9), there is an electric cylinder (10). The piston rod of the electric cylinder (10) penetrates through the installation frame (9) and is fixedly installed with an installation plate (11). The plugging rod (7) is installed on the installation plate (11), and the installation plate (11) is slidably assembled vertically inside the installation frame (9).

3. The electrolyte flame retardancy performance testing device according to claim 2, wherein: The plugging rod (7) includes a rod part (71) arranged vertically. The rod part (71) is sleeved on the installation plate (11) through a bearing. At the top of the outer circumferential surface of the rod part (71), there are guiding protrusions (74) distributed radially along it. Above the plugging rod (7), there is a guiding cylinder (75). The leading end of the guiding protrusion (74) is movably sleeved in the inner cavity of the guiding cylinder (75). The guiding cylinder (75) is fixedly installed on the installation frame (9). On the outer circumferential surface of the guiding cylinder (75), there is a spiral guiding groove (76), and the guiding cylinder (75) is slidably assembled in the spiral guiding groove (76).

4. The electrolyte flame retardancy performance testing device according to claim 3, characterized in that: At the end of the rod part (71), there is a limiting disc (72) installed. At the lower end of the limiting disc (72), there is a pointed head part (73). The test column (12) is plugged on the pointed head part (73).

5. The electrolyte flame retardancy performance testing device according to claim 3, characterized in that: The number of spiral turns of the spiral guiding groove (76) is at least greater than two.

6. The electrolyte flame retardancy performance testing device according to any one of claims 1 to 5, characterized in that: Inside the combustion chamber (5), there is a reflux baffle (51) installed in a funnel-shaped structure. At the center of the reflux baffle (51), there is a through hole (52) with a radius larger than the radius of the test column (12).

7. The electrolyte flame retardancy performance testing device according to claim 6, wherein: The oxygen part (4) and the combustion chamber (5) are connected through an oxygen outlet pipe (43), and a valve two (44) is installed on the oxygen outlet pipe (43).

8. The electrolyte flame retardancy performance testing device according to claim 1, wherein: The oxygen part (4) communicates with an external oxygen supply device through an oxygen inlet pipe (41), and a valve one (42) is installed on the oxygen inlet pipe (41).

9. The electrolyte flame retardancy performance testing device according to claim 1, wherein: Adjacent two combustion chambers (5) are connected through a connecting pipe (13), and a connecting valve (14) is installed on the connecting pipe (13).

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