Device for measuring infiltration rate of porous solid material electrolyte

Abstract

The utility model relates to the technical field of electrolyte infiltration rate testing, and particularly discloses a device for measuring the electrolyte infiltration rate of a porous solid material, which comprises a detection assembly, the detection assembly comprises a blanking container, a material receiving container, a monitor and a weighing device, the blanking container is positioned right above the porous solid material, and the material receiving container is positioned right above the porous solid material. The material receiving container is located under the porous solid material, the monitor is located on one side of the porous solid material, when the discharging container is opened, the electrolyte falls onto the porous solid material and infiltrates the porous solid material, and the monitor can monitor the time when the electrolyte penetrates through the porous solid material; the weighing device is used for detecting the weight of the electrolyte in the material receiving container, part of the electrolyte is absorbed by the porous solid material when the electrolyte penetrates through the porous solid material, the weight of the electrolyte absorbed by the porous solid material can be obtained through the weight difference between the electrolyte and the porous solid material, and according to the weight and the infiltrating time, the infiltrating time can be calculated. And the electrolyte infiltration efficiency of the porous solid material can be obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrolyte infiltration rate measurement, and particularly to a device for measuring electrolyte infiltration rate of porous solid material. BACKGROUND

[0002] In battery products, there is a very important indicator, which is the electrolyte infiltration degree of battery components. The higher the infiltration degree of battery components, the faster the transmission rate of electric charge, which can improve the performance and service life of the battery. The electrolyte infiltration rate of battery components is mainly determined by the materials of battery components, including material quality, mass, density and other factors. For example, materials with good wettability will be compacted as the range of electric vehicle mileage increases and the energy density of lithium iron phosphate batteries increases, and their density will also increase, resulting in smaller porosity and more difficult electrolyte infiltration in the material. If the infiltration degree of electrode sheets is too low, it will cause black spot lithium precipitation in the battery, thereby causing a series of safety risks. Therefore, it is necessary to detect the infiltration performance of specific materials.

[0003] In the prior art, the detection of material wettability is mainly through two ways. One is to observe the liquid absorption rate of the electrode sheet in the electrolyte to indirectly judge the liquid absorption rate of the material after the material is made into an electrode sheet. For example, the patent with publication number CN115165677A discloses a method for testing the wettability of electrolyte in solid electrode porous material, which can detect the liquid absorption rate of the battery electrode sheet. However, this method is affected by various process factors such as the physical properties of positive and negative materials, conductive agents, adhesive properties and process compaction, and cannot test the liquid absorption rate of the same batch of materials alone. The second way is to measure the contact angle to reflect the wettability of the sample. The contact angle is the angle between the solid-liquid interface and the gas-liquid interface inside the liquid at the intersection of the solid, liquid and gas three phases. It is an important parameter for measuring the wettability of the liquid on the material surface. However, it is difficult to distinguish the difference between the same type of materials using this method, and the infiltration rate of the material cannot be qualitatively obtained. It is also not suitable for battery porous materials. SUMMARY

[0004] The utility model considers the foregoing problem and is made. The purpose of the utility model is to provide a device for measuring the electrolyte infiltration rate of porous solid material, which can measure the electrolyte infiltration rate of porous solid material with specific mass and density, and has high measurement accuracy.

[0005] In order to achieve the above object, the utility model provides a kind of device for measuring the electrolyte infiltration rate of porous solid material, including detection component, the detection component includes blanking container, receiving container, monitor and weigher, the blanking container is used to place the electrolyte of first preset weight, and the blanking container and the receiving container are located respectively above and below the porous solid material, the monitor is located in the side of porous solid material, for monitoring the time of electrolyte passing through porous solid material;

[0006] The weigher is located below the receiving container and is used to detect the weight of electrolyte in the receiving container.

[0007] The utility model according to the above further includes a forming assembly, the forming assembly includes a forming barrel, an upper pressing block and a lower support block, the upper pressing block and the lower support block respectively extend into the forming barrel along the upper end and the lower end of the forming barrel, and the upper pressing block can be extruded with the lower support block to form a second preset weight of porous solid material.

[0008] The utility model according to the above, the forming assembly further includes a limiting block, the limiting block is located on the inner wall of the middle part of the forming barrel, the top of the lower support block can abut against the bottom of the limiting block, and the bottom of the upper pressing block can abut against the top of the limiting block.

[0009] The utility model according to the above, a plurality of limiting blocks are arranged on the inner wall of the forming barrel along the circumference of the forming barrel to form a limiting ring.

[0010] The utility model according to the above, the forming assembly further includes a forming motor, the forming motor is connected with the upper pressing block and can drive the upper pressing block to move up and down.

[0011] The utility model according to the above, the bottom of the blanking container is provided with a first opening, the first opening is located directly above the forming barrel, and the top of the receiving container is provided with a second opening, and the second opening is located directly below the forming barrel.

[0012] The utility model according to the above, a switch is arranged in the first opening, and the switch can control the opening or closing of the first opening.

[0013] The utility model according to the above, the diameter of the second opening is greater than the diameter of the porous solid material.

[0014] The device for measuring the electrolyte infiltration rate of porous solid material according to the preceding description further comprises a shell, the shell is internally provided with a sealed containing cavity, and the detection assembly and the forming assembly are both located in the shell.

[0015] The device for measuring the electrolyte infiltration rate of porous solid material according to the preceding description further comprises a vacuum extraction assembly, the vacuum extraction assembly comprises a vacuum extraction pump and a containing box, the vacuum extraction pump is located outside the shell, the inlet of the vacuum extraction pump is communicated with the containing cavity in the shell, and the outlet of the vacuum extraction pump is communicated with the containing box.

[0016] The device for measuring the electrolyte infiltration rate of porous solid material according to the preceding description has the following beneficial effects:

[0017] 1. The first preset weight of electrolyte can be dropped onto the upper surface of the porous solid material by using the blanking container, the time for the electrolyte to pass through the porous solid material can be monitored by the monitor, the weight of the electrolyte dropped into the receiving container can be weighed by the weighing device, the weight of the electrolyte absorbed by the porous solid material can be obtained by the weight difference of the electrolyte, and then the infiltration rate of the porous solid material of the first preset weight can be measured by dividing the weight by the passing time, and the measurement precision is high.

[0018] 2. The vacuum extraction assembly can be used to extract vacuum in the shell, the internal condition of the battery can be completely simulated, the detection can be more in line with the actual situation, and the measurement precision is improved.

[0019] 3. The forming assembly can be used to form the porous solid material in real time, the mass and the density of the porous solid material can be controlled by the forming assembly, different porous solid materials can be detected, and the applicability is good. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a whole structure schematic view of the embodiment.

[0021] Fig. 2 It is a structure schematic view of the forming assembly of the embodiment.

[0022] In the drawings:

[0023] 100, detection assembly; 101, blanking container; 102, receiving container; 103, monitor; 104, weighing device; 105, switch;

[0024] 200, forming assembly; 201, forming barrel; 202, upper pressing block; 203, lower supporting block; 204, limiting block;

[0025] 300, vacuum extraction assembly; 301, vacuum pump; 302, containing box;

[0026] 400, shell.

[0027] 500, porous solid material. DETAILED DESCRIPTION

[0028] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings, but the present application is not limited to these embodiments.

[0029] As Figs. 1-2 For example, a device for measuring the electrolyte infiltration rate of a porous solid material, comprising a forming assembly 200, a vacuum extraction assembly 300 and a detection assembly 100, the forming assembly 200 is used to form a porous solid material 500 with a preset weight and a preset density, the vacuum extraction assembly 300 is used to extract air to simulate a vacuum environment of a battery, and the detection assembly 100 is used to detect the electrolyte infiltration rate of the porous solid material 500 processed by the forming assembly 200.

[0030] Specifically, the detection assembly 100 comprises a blanking container 101, a receiving container 102, a monitor 103 and a scale 104, the blanking container 101 is used to place a first preset weight of electrolyte, the blanking container 101 is located directly above the porous solid material 500, the receiving container 102 is located directly below the porous solid material, the monitor 103 is located on one side of the porous solid material 500, and when the blanking container 101 is opened, the first preset weight of electrolyte will fall onto the porous solid material 500, and the electrolyte will infiltrate into the porous solid material 500. During this process, the monitor 103 is used to monitor the time of the electrolyte passing through the porous solid material 500, and the scale 104 is located below the receiving container 102 and is used to detect the weight of the electrolyte in the receiving container 102, that is, when the electrolyte passes through the porous solid material 500, part of the electrolyte will be absorbed by the porous solid material 500, and by comparing the weight difference before and after, the weight of the electrolyte absorbed by the porous solid material 500 can be obtained, and according to the weight and the infiltration time, the electrolyte infiltration efficiency of the porous solid material 500 can be obtained.

[0031] In this embodiment, the time when the electrolyte is located on the surface of the porous solid material 500 is the initial time T1, and the time when the electrolyte passes through the porous solid material 500 to the lower surface thereof is the end time T2, so the infiltration time T of the electrolyte in the porous solid material 500 is T2-T1, the first preset weight is M1, the weight of the electrolyte falling into the receiving container 102 is M2, and the weight M of the electrolyte absorbed by the porous solid material 500 is M1-M2, so the electrolyte infiltration rate V of the porous solid material 500 is M÷T, and the real infiltration rate of the porous solid material 500 is measured in this way.

[0032] In order to improve the accuracy of the measurement of the weight of the remaining electrolyte, the receiving container 102 is directly placed on the scale 104.

[0033] In the embodiment, the blanking container 101 can be a blanking funnel or other container with an opening, the receiving container 102 can be a beaker or other container, the monitor 103 can be a camera or camera recording instrument, and the weighing device 104 can be an electronic scale or balance with high precision.

[0034] Specifically, the forming assembly 200 includes a forming cylinder 201, an upper pressing block 202, and a lower supporting block 203. The upper pressing block 202 and the lower supporting block 203 respectively extend into the forming cylinder 201 along the upper end and the lower end of the forming cylinder 201. Of course, the upper pressing block 202 and the lower supporting block 203 can also be separated from the forming cylinder 201. First, the lower supporting block 203 is inserted into the forming cylinder 201 along the lower part of the forming cylinder 201, then a second pre-set weight of powder is added to the top of the forming cylinder 201, the powder falls onto the top of the lower supporting block 203, and after the powder is added, the upper pressing block 202 is pressed downward to cooperate with the lower supporting block 203 to extrude the second pre-set weight of porous fixing material 500. The material of the formed porous fixing material 500 is determined by the powder, and the weight of the porous fixing material 500 is consistent with the weight of the added powder, realizing the controllability of the porous fixing material 500 and improving the detection accuracy.

[0035] In order to ensure the forming precision of the porous solid material 500, the forming assembly 200 further includes a limiting block 204. The limiting block 204 is located on the inner wall of the middle part of the forming cylinder 201. The top of the lower supporting block 203 can abut against the bottom of the limiting block 204, and the bottom of the upper pressing block 202 can abut against the top of the limiting block 204. The limiting block 204 limits the maximum height of the lower supporting block 203 and the minimum height of the upper pressing block 202, avoids the mutual action of the forces, and also limits the forming height of the powder within the limiting block 204. After forming, the upper pressing block 202 and the lower supporting block 203 can be withdrawn without removing the porous solid material 500, so that the porous solid material 500 can be detected in the forming cylinder 201, and the detection is more convenient.

[0036] In order to form the powder, a plurality of limiting blocks 204 are arranged on the inner wall of the forming cylinder 201 along the circumference of the forming cylinder 201, and a limiting ring is formed by surrounding. When the powder is extruded and formed, the powder is limited between the inner circle of the limiting ring, and the porous solid material 500 with a pre-set density can be effectively obtained.

[0037] In the embodiment, in order to drive the upper pressing block 202 to perform the up-down lifting movement, realize its pressing forming and exit action, the forming assembly 200 further comprises a forming motor, which is connected with the upper pressing block 202 and can drive the upper pressing block 202 to perform the lifting action, and the lower pressing can extend into the forming barrel 201 to perform the pressing action, and the upper pressing can exit the forming barrel 201. The motor has high control precision and can accurately control the pressing force. Preferably, it is a servo linear motor. Of course, other driving members except the motor can also achieve the purpose, such as an oil cylinder or the like.

[0038] Similarly, in order to realize the lifting action of the lower supporting block 203, a driving member can also be arranged to drive it, such as a motor, an oil cylinder or a gas cylinder.

[0039] In order to directly test in the forming barrel 201, the bottom of the discharging container 101 is provided with a first opening which is located directly above the forming barrel 201. A switch 105 is arranged in the first opening, which can control the opening or closing of the first opening. When the switch 105 controls the opening of the first opening, the electrolyte in the discharging container 101 can directly fall on the porous solid material 500 in the forming barrel 201. In order to ensure accurate falling, the first opening is located directly above the middle of the forming barrel 201 and falls in the middle. A second opening is arranged at the top of the receiving container 102, which is located directly below the forming barrel 201. When the excess electrolyte falls from below the porous solid material 500, it will fall into the receiving container 102 through the second opening.

[0040] In the embodiment, the diameter of the second opening in the receiving container 102 is greater than the diameter of the porous solid material 500, so that the electrolyte leaked from the porous solid material 500 can all fall into the discharging container 101.

[0041] The receiving container 102 has at least two arrangement modes. One is that the top of the receiving container 102 directly abuts on the bottom of the limiting block 204, which requires that the diameter of the receiving container 102 is smaller than the inner diameter of the forming barrel 201. The other is that the receiving container 102 is located outside the forming barrel 201 and does not directly extend into the forming barrel 201.

[0042] In order to protect the whole device, an outer shell 400 is further included, which has a sealed containing cavity. The detection assembly 100 and the forming assembly 200 are located in the outer shell 400. The outer shell 400 can avoid the erosion of water mist and dust on the detection assembly 100 and the forming assembly 200.

[0043] Specifically, the vacuumizing assembly 300 comprises a vacuumizing pump 301 and a containing box 302, the vacuumizing pump 301 is located outside the shell 400, the inlet of the vacuumizing pump 301 is communicated with the containing cavity in the shell 400, the outlet of the vacuumizing pump 301 is communicated with the containing box 302, the air in the shell 400 can be extracted by the vacuumizing pump 301, so that the forming assembly 200 and the detecting assembly 100 are in a vacuum state, and the electrolyte is in a vacuum state when infiltrating the porous solid material 500, which is completely consistent with the actual situation of the battery.

[0044] In the embodiment, the powder is firstly added into the forming cylinder 201, the upper pressing block 202 and the lower supporting block 203 are used to extrude the powder into the porous solid material 500 with a preset weight, then the upper pressing block 202 and the lower supporting block 203 are removed, the air in the shell 400 is extracted by the vacuumizing pump 301, when in the vacuum state, the first opening of the discharging container 101 is opened, the electrolyte falls on the porous solid material 500, the infiltration time is observed by the monitor, part of the electrolyte falls into the receiving container 102 after passing through the porous solid material 500, and the weight is weighed, the infiltration efficiency can be obtained by the ratio of the weight difference and the infiltration time, and the measurement precision is higher.

[0045] The technical scheme of the utility model is described in detail above in combination with the drawings, and the described embodiment is used to help understand the idea of the utility model. The specific embodiment described in this paper is only an example of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiment or replace it with similar ways, but it will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, the description of "first", "second", "one" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0048] In the utility model, unless another definite provision and limitation, the term "connect", "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0049] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. An apparatus for measuring the rate of electrolyte impregnation of a porous solid material, characterized by, The detection assembly comprises a feeding container, a receiving container, a monitor and a weighter, the feeding container is used for placing a first preset weight of electrolyte, and the feeding container and the receiving container are located above and below the porous solid material respectively, and the monitor is located on one side of the porous solid material and used for monitoring the time of the electrolyte passing through the porous solid material. The weighter is located below the receiving container and used for detecting the weight of the electrolyte in the receiving container.

2. The device for measuring the rate of electrolyte penetration into a porous solid material according to claim 1, wherein The forming assembly comprises a forming cylinder, an upper pressing block and a lower supporting block, the upper pressing block and the lower supporting block extend into the forming cylinder along the upper end and the lower end of the forming cylinder respectively, and the upper pressing block can be pressed together with the lower supporting block to form a second preset weight of the porous solid material.

3. A device for measuring the rate of electrolyte imbibition into a porous solid material according to claim 2, wherein, The forming assembly further comprises a limiting block located on the inner wall of the middle part of the forming cylinder, the top of the lower supporting block can abut against the bottom of the limiting block, and the bottom of the upper pressing block can abut against the top of the limiting block.

4. The device for measuring the rate of electrolyte solution imbibition into a porous solid material according to claim 3, wherein A plurality of limiting blocks are arranged on the inner wall of the forming cylinder along the circumference of the forming cylinder to form a limiting ring.

5. The apparatus of claim 2, wherein the porous solid material is a ceramic. The forming assembly further comprises a forming motor connected with the upper pressing block and capable of driving the upper pressing block to perform lifting movement.

6. The apparatus of claim 2, wherein, The bottom of the feeding container is provided with a first opening located above the forming cylinder, and the top of the receiving container is provided with a second opening located below the forming cylinder.

7. A device for measuring the rate of electrolyte solution imbibition into a porous solid material according to claim 6, wherein, The first opening is provided with a switch capable of controlling the opening and closing of the first opening.

8. The apparatus of claim 6, wherein the porous solid material is a ceramic. The diameter of the second opening is greater than the diameter of the porous solid material.

9. The apparatus of claim 2, wherein, The housing is provided with a sealed accommodating cavity, and the detection assembly and the forming assembly are located in the housing.

10. The apparatus of claim 9, wherein the porous solid material is a ceramic. The vacuum pumping assembly comprises a vacuum pump and an accommodating box, the vacuum pump is located outside the housing, the inlet of the vacuum pump is communicated with the accommodating cavity in the housing, and the outlet of the vacuum pump is communicated with the accommodating box.

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