Battery material testing device

Abstract

The utility model discloses a battery material testing device. The battery material testing device comprises a clamping plate assembly, the clamping plate assembly comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are detachably connected through a fastener; a first containing groove and a second containing groove are formed between the first clamping plate and the second clamping plate, the first containing groove is used for containing a to-be-tested element, the second containing groove is used for containing a test solution, and the first containing groove is communicated with the second containing groove.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and more specifically, to a battery material testing device. Background Art

[0002] As my country pays more and more attention to energy conservation and environmental protection, the use of green and environmentally friendly electrical equipment is becoming more and more widespread. The power source of such electrical equipment is lithium-ion batteries, which have the advantages of high energy density, long cycle life, and high energy conversion efficiency.

[0003] In recent years, lithium-ion batteries have become a hot topic in the field of new energy research, and the requirements for their energy density and cycle life are becoming increasingly stringent. However, the energy density and cycle life of lithium-ion batteries are greatly affected by the wettability of electrolytes on battery materials. Therefore, it is very important to find a fast, accurate and convenient test device and test method to characterize the wettability of electrolytes on battery materials.

[0004] In the prior art, common methods for measuring the wettability of electrolyte on battery cell materials include the liquid absorption method, weighing method and suspension method. These traditional testing methods often cannot truly simulate the actual environment of the electrode in the battery cell, resulting in inaccurate test results.

[0005] In view of this, it is necessary to propose a new technical solution to solve the above technical problems. Utility Model Content

[0006] One purpose of the present application is to provide a new technical solution for a battery material testing device.

[0007] According to a first aspect of the present application, a battery material testing device is provided, the battery material testing device comprising:

[0008] A clamping plate assembly, the clamping plate assembly comprising a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are detachably connected via a fastener;

[0009] A first receiving groove and a second receiving groove are formed between the first clamping plate and the second clamping plate. The first receiving groove is used to place the component to be tested, and the second receiving groove is used to hold the test solution. The first receiving groove and the second receiving groove are connected to each other.

[0010] Optionally, the first clamping plate has a first surface, the first surface is provided with a first sub-groove and a second sub-groove, and the first sub-groove and the second sub-groove are isolated from each other;

[0011] The second clamping plate has a second surface, the second surface is provided with a third sub-groove and a fourth sub-groove, and the third sub-groove is connected to the fourth sub-groove;

[0012] When the first clamping plate and the second clamping plate are connected, the first surface and the second surface fit each other; the first sub-groove and the third sub-groove are spliced ​​to form the first receiving groove; the second sub-groove and the fourth sub-groove are spliced ​​to form the second receiving groove.

[0013] Optionally, a sealing groove is formed on the second surface, and the sealing groove is arranged on the outer periphery of the third sub-groove and the fourth sub-groove;

[0014] The clamping plate assembly further includes a sealing ring, wherein the sealing ring is partially accommodated in the sealing groove, and when the first clamping plate and the second clamping plate are connected, the sealing ring abuts against the first surface.

[0015] Optionally, the second clamping plate is provided with a liquid injection hole, and the liquid injection hole is communicated with the fourth sub-groove.

[0016] Optionally, the number of the first sub-slots and the number of the second sub-slots are both at least two, and the first sub-slots and the second sub-slots are arranged in a one-to-one correspondence;

[0017] The number of the third sub-slots and the number of the fourth sub-slots are both at least two, and the third sub-slots are arranged in a one-to-one correspondence with the fourth sub-slots.

[0018] Optionally, the clamping plate assembly further includes a gasket, which is disposed in the first sub-groove or the third sub-groove, and the gasket is configured to adjust the depth of the first receiving groove.

[0019] Optionally, at least one of the first clamping plate and the second clamping plate is made of a transparent material.

[0020] Optionally, the battery material testing device further comprises a fixing seat, and the clamping plate assembly is mounted on the fixing seat so that the first receiving slot and the second receiving slot are in a vertical posture.

[0021] Optionally, the fixed seat includes a support platform and a fixed baffle, the support platform has a support surface, at least two fixed baffles are arranged, at least two of the fixed baffles are arranged on the support surface, and at least two of the fixed baffles form a gap portion in the first direction, the clamping plate assembly is installed in the gap portion, and the clamping plate assembly abuts against the fixed baffle; the first direction corresponds to the thickness direction of the first clamping plate and the second clamping plate.

[0022] Optionally, along the first direction, the fixed baffle is movably connected to the supporting surface.

[0023] Optionally, the fixing seat further includes at least two supporting legs, at least two of the supporting legs are connected to the supporting platform, and at least two of the supporting legs are arranged opposite to the supporting surface; and the supporting legs are height-adjustable supporting legs.

[0024] Optionally, the battery material testing device further includes a pad, which is disposed between the first clamping plate and the second clamping plate, and the first accommodating groove and the second accommodating groove are opened on the pad.

[0025] The technical solution adopted in this application can achieve the following beneficial effects:

[0026] In the battery material testing device provided in the embodiment of the present application, by adjusting the torque of the bolts connecting the first clamp and the second clamp, the size of the restraint force on the component to be tested between the first clamp and the second clamp can be adjusted, thereby achieving the effect of simulating the real environment in which the component to be tested is located, such as truly simulating the actual environment of the electrode in the battery cell, thereby improving the accuracy of the test results.

[0027] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0029] Figure 1 is a structural schematic diagram of a battery material testing device according to an embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a first clamping plate in a battery material testing device according to an embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a second clamping plate in a battery material testing device according to an embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the structure of a fixing seat in a battery material testing device according to an embodiment of the present application. Figure 1 ;

[0033] Figure 5 This is a schematic diagram of the structure of a fixing seat in a battery material testing device according to an embodiment of the present application. Figure 2 .

[0034] Description of reference numerals:

[0035] 1. Clamping plate assembly; 11. First clamping plate; 110. First surface; 111. First sub-groove; 112. Second sub-groove; 12. Second clamping plate; 120. Second surface; 121. Third sub-groove; 122. Fourth sub-groove; 123. Sealing groove; 1200. Liquid injection hole; 13. Sealing ring; 14. Fastener;

[0036] 2. Fixed seat; 21. Support platform; 210. Support surface; 22. Fixed baffle; 200. Gap portion; 23. Support leg. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] Reference Figure 1-Figure 5 As shown, according to one embodiment of the present application, a battery material testing device is provided. The battery material testing device comprises a clamping plate assembly 1, wherein the clamping plate assembly 1 comprises a first clamping plate 11 and a second clamping plate 12, wherein the first clamping plate 11 and the second clamping plate 12 are detachably connected via a fastener;

[0043] A first receiving groove and a second receiving groove are formed between the first clamping plate 11 and the second clamping plate 12 . The first receiving groove is used to place the component to be tested, and the second receiving groove is used to hold the test solution. The first receiving groove and the second receiving groove are communicated with each other.

[0044] In the battery material testing device provided in the embodiment of the present application, the clamp assembly 1 is a main measuring part used to fix the component to be tested (such as an electrode sheet or an electrode core) and to store a test solution (such as an electrolyte); specifically, a first receiving groove and a second receiving groove are formed between the first clamp 11 and the second clamp 12 included in the clamp assembly 1, wherein the component to be tested is placed in the first receiving groove, and the test solution is placed in the second receiving groove, and the first receiving groove and the second receiving groove are connected to each other, so that the test solution can enter the first receiving groove from the second receiving groove to infiltrate the component to be tested.

[0045] In the battery material testing device provided in the embodiment of the present application, the first clamp plate 11 and the second clamp plate 12 are detachably connected by a fastener 14; for example, the first clamp plate 11 and the second clamp plate 12 are connected by multiple sets of bolts and nuts, and by tightening or loosening the bolts, that is, by adjusting the torque of the bolts, the size of the restraint force exerted on the component to be tested between the first clamp plate 11 and the second clamp plate 12 can be adjusted to achieve the effect of simulating the real environment of the component to be tested, such as truly simulating the actual environment of the electrode in the battery cell, thereby improving the accuracy of the test results.

[0046] Reference Figure 2-Figure 3 As shown, in one embodiment, the first clamping plate 11 has a first surface 110, and the first surface 110 is provided with a first sub-groove 111 and a second sub-groove 112, and the first sub-groove 111 and the second sub-groove 112 are isolated from each other;

[0047] The second clamping plate 12 has a second surface 120 , and the second surface 120 is provided with a third sub-groove 121 and a fourth sub-groove 122 , and the third sub-groove 121 and the fourth sub-groove 122 are communicated with each other;

[0048] When the first clamping plate 11 and the second clamping plate 12 are connected, the first surface 110 and the second surface 120 fit each other; the first sub-groove 111 and the third sub-groove 121 are spliced ​​to form the first receiving groove; the second sub-groove 112 and the fourth sub-groove 122 are spliced ​​to form the second receiving groove.

[0049] In this specific example, the first clamping plate 11 and the second clamping plate 12 are both similar to rectangular parallelepiped structures, and the thickness of the rectangular parallelepiped structure is smaller than the length and width; the first clamping plate 11 and the second clamping plate 12 are connected to each other along the thickness direction of the two, wherein the first surface 110 of the first clamping plate 11 and the second surface 120 of the second clamping plate 12 are in contact with each other. The first sub-groove 111 opened on the first surface 110 and the third sub-groove 121 opened on the second surface 120 jointly form a first receiving groove; the second sub-groove 112 opened on the first surface 110 and the fourth sub-groove 122 opened on the second surface 120 jointly form a second receiving groove; wherein the third sub-groove 121 opened on the second surface 120 and the fourth sub-groove 122 are connected to each other, thereby ensuring that the first receiving groove and the second receiving groove are connected to each other, so that the test solution can enter the first receiving groove from the second receiving groove to infiltrate the component to be tested.

[0050] Reference Figure 3 As shown, in one embodiment, the second surface 120 is provided with a sealing groove 123, and the sealing groove 123 is arranged at the periphery of the third sub-groove 121 and the fourth sub-groove 122;

[0051] The clamping plate assembly 1 further includes a sealing ring 13 , and a portion of the sealing ring 13 is accommodated in the sealing groove 123 . When the first clamping plate 11 and the second clamping plate 12 are connected, the sealing ring 13 abuts against the first surface 110 .

[0052] In this specific example, a sealing groove 123 is further provided on the second surface 120, and the sealing groove 123 is provided on the outer periphery of the third sub-groove 121 and the fourth sub-groove 122. The length of the sealing groove 123 is greater than the sum of the lengths of the third sub-groove 121 and the fourth sub-groove 122, and the width of the sealing groove 123 is greater than the sum of the widths of the third sub-groove 121 and the fourth sub-groove 122. Optionally, the depth of the sealing groove 123 is less than the depth of the third sub-groove 121 and also less than the depth of the fourth sub-groove 122. When the sealing ring 13 is provided in the sealing groove 123, a part of the sealing ring 13 protrudes from the second surface 120, and when the first clamping plate 11 and the second clamping plate 12 are connected, the sealing ring 13 abuts against the first surface 110, thereby ensuring that the first receiving groove and the second receiving groove are in an absolutely sealed environment to prevent the test solution (electrolyte) from volatilizing and interfering with the test accuracy.

[0053] Reference Figure 3 As shown, in one embodiment, the second clamping plate 12 is provided with a liquid injection hole 1200 , and the liquid injection hole 1200 is communicated with the fourth sub-groove 122 .

[0054] In this specific example, before the test begins, the second holding tank can be evacuated through the injection hole 1200; then the test solution is poured into the second holding tank through the injection hole 1200; after the test is completed, the remaining test solution is pumped out through the injection hole 1200.

[0055] Reference Figure 2-Figure 3 As shown, in one embodiment, the number of the first sub-slots 111 and the second sub-slots 112 is at least two, and the first sub-slots 111 and the second sub-slots 112 are arranged in a one-to-one correspondence;

[0056] The number of the third sub-grooves 121 and the number of the fourth sub-grooves 122 are both at least two, and the third sub-grooves 121 and the fourth sub-grooves 122 are arranged in a one-to-one correspondence.

[0057] In this specific example, the number of the first receiving slots and the second receiving slots is at least two, and one first receiving slot corresponds to one second receiving slot; for example, two first receiving slots are provided, and two second receiving slots are also provided, and the first receiving slots correspond to the second receiving slots one by one. In this way, two components to be tested can be tested at the same time, thereby improving the test efficiency and facilitating the comparison and analysis of the test results.

[0058] In addition, for the second clamping plate 12 , the number of the sealing grooves 123 corresponds to the number of the third sub-grooves 121 and the fourth sub-grooves 122 , and a sealing ring 13 is installed in each sealing groove 123 .

[0059] In one embodiment, the clamping plate assembly 1 further includes a gasket, which is disposed in the first sub-groove 111 or the third sub-groove 121 , and is configured to adjust the depth of the first receiving groove.

[0060] In this specific example, by placing a gasket with matching shape into the first sub-groove 111 or the third sub-groove 121 , the depth of the first receiving groove can be flexibly adjusted, thereby being able to better accommodate components to be tested of different sizes.

[0061] In one embodiment, at least one of the first clamping plate 11 and the second clamping plate 12 is made of a transparent material.

[0062] In this specific example, in order to facilitate the visual test operation, the first clamping plate 11 can be made of a transparent material, such as an acrylic plate, tempered glass or PVC material. The second clamping plate 12 can be made of a transparent material; or a non-transparent material, such as an aluminum plate. It should be noted that the materials used for the first clamping plate 11 and the second clamping plate 12 need to be resistant to long-term corrosion by the electrolyte.

[0063] Reference Figure 4-Figure 5 As shown, in one embodiment, the battery material testing device further includes a fixing seat 2, and the clamping plate assembly 1 is mounted on the fixing seat 2 so that the first receiving slot and the second receiving slot are in a vertical posture.

[0064] In this specific example, the fixing seat 2 is used to fix the clamping plate assembly 1, and the clamping plate assembly 1 is installed on the fixing seat 2 in a vertical state, wherein the first accommodating groove and the second accommodating groove are both in a vertical posture, so that when the component to be measured is placed in the first accommodating groove and the clamping plate assembly 1 is installed on the fixing seat 2, the plane where the component to be measured is located is almost perpendicular to the horizontal plane.

[0065] Reference Figure 4-Figure 5 As shown, in one embodiment, the fixed seat 2 includes a support platform 21 and a fixed baffle 22, the support platform 21 has a support surface 210, at least two fixed baffles 22 are arranged, at least two fixed baffles 22 are arranged on the support surface 210, and at least two fixed baffles 22 form a gap portion 200 in the first direction, the clamping plate assembly 1 is installed in the gap portion 200, and the clamping plate assembly 1 is abutted against the fixed baffle 22; the first direction corresponds to the thickness direction of the first clamping plate 11 and the second clamping plate 12.

[0066] In this specific example, the support platform 21 included in the fixed seat 2 plays an integral supporting and mounting role for the clamping plate assembly 1; and at least two fixed baffles 22 arranged on the support platform 21 are clamped on both sides of the clamping plate assembly 1 along the thickness direction of the first clamping plate 11 and the second clamping plate 12. In this way, the installation and disassembly of the clamping plate assembly 1 on the fixed seat 2 are very convenient. For example, a total of four fixed baffles 22 are arranged, of which two fixed baffles 22 are arranged on the side close to the first clamping plate 11, and the other two fixed baffles 22 are arranged on the side close to the second clamping plate 12; the four fixed baffles 22 are staggered along the width direction of the first clamping plate 11 and the second clamping plate 12, so that the supporting force of the four fixed baffles 22 on the clamping plate assembly 1 is more dispersed and uniform, thereby improving the installation stability of the clamping plate assembly 1.

[0067] Reference Figure 4-Figure 5 As shown, in one embodiment, along a first direction, the fixed baffle 22 is movably connected to the supporting surface 210 .

[0068] For example, bolts can be used to connect the fixed baffle 22 and the supporting surface 210, and a waist-shaped hole is set at the bottom of the fixed baffle 22, and the bolts are connected in the waist-shaped hole. The length direction of the waist-shaped hole corresponds to the width of the gap portion 200, that is, corresponds to the thickness direction of the first clamping plate 11 and the second clamping plate 12; by loosening the bolts, the fixed baffle 22 can be moved along the length direction of the waist-shaped hole, so that the width of the gap portion 200 can be adjusted to adapt to clamping plate assemblies 1 of different thicknesses.

[0069] Reference Figure 4-Figure 5 As shown, in one embodiment, the fixing seat 2 further includes at least two supporting legs 23, at least two of the supporting legs 23 are connected to the supporting platform 21, and at least two of the supporting legs 23 are arranged opposite to the supporting surface 210; the supporting legs 23 are height-adjustable supporting legs.

[0070] For example, there are four support legs 23 in total, and the four support legs 23 are respectively arranged at the four corners of the support platform 21. The height of each support leg 23 can be adjusted independently. By adjusting the height of the four support legs 23 respectively, it can be ensured that the support platform 21 is in a horizontal state.

[0071] The following is a detailed description of the method of using the battery material testing device, taking the component to be tested as the electrode and the test solution as the electrolyte as an example:

[0072] A fresh electrode is selected, the size of which matches the first receiving groove. The front and back sides of the electrode are wrapped with two layers of diaphragms, and the outside of the diaphragms is also wrapped with a layer of plastic wrap to ensure that the electrolyte in the electrode is not easy to evaporate and simulate the internal environment of the battery cell. The electrode is placed flat in the third sub-groove 121 of the second clamping plate 12.

[0073] After aligning the first clamping plate 11 and the second clamping plate 12, tighten the bolts with a torque wrench. The bolts are, for example, M8 in specification and have a torque of 30 N / m to ensure good sealing inside the assembled clamping plate assembly 1. The restraining force on the pole piece can be adjusted by adjusting the torque of the bolts; in addition, to adjust the restraining force on the pole piece, dozens of layers of stainless steel gaskets with a thickness of ten threads can be placed between the pole piece and the third sub-slot 121, and the gap size of the first receiving slot can be adjusted according to the number of gasket layers.

[0074] Insert the splint assembly 1 into the gap portion 200 of the fixing seat 2, and fine-tune the height of the support leg 23 and the width of the gap portion 200 to ensure that the splint assembly 1 is in a completely vertical state. Use a vacuum pump and a plastic tube to evacuate the second receiving tank from the injection hole 1200, and the vacuum degree is -0.2Mpa, and then switch the electrolyte to negative pressure injection from the injection hole 1200. The electrolyte is a conventional commercial lithium-ion battery electrolyte. The amount of electrolyte injected is to fill the second receiving tank, enter the first receiving tank through the connection between the third sub-slot 121 and the fourth sub-slot 122, and submerge the bottom of the electrode by 2-3cm, and then close the injection hole 1200 with a rubber nail. It is necessary to ensure that the splint assembly 1 does not shake during and after the injection, and record the initial electrolyte height H1.

[0075] The static device observes the height change of the electrolyte through the transparent first clamping plate 11. After a period of time T, the electrolyte reaches the limit height H2. The climbing ability of the electrolyte in the height direction of the electrode is determined according to H2-H1, and the climbing rate of the electrolyte in the height direction of the electrode is determined according to (H2-H1) / T.

[0076] After T time, the remaining electrolyte is extracted through the injection hole 1200, and then the splint assembly 1 is taken out from the gap portion 200 of the fixing seat 2. The splint assembly 1 is kept in a vertical state, the bolts are removed and the pole piece is taken out. Use a sampler to sample the pole piece together with the diaphragm and plastic wrap. The sampling method is to take a sample every 2-5cm starting from the initial height H1. Use tweezers to quickly peel off the outer plastic wrap and diaphragm of the sample pole piece, and put the sample pole piece into a glass bottle containing acetone. Place one sample pole piece in each glass bottle, tighten the lid and strengthen the seal with a sealing strip. The acetone content in the bottle is 3-5g to ensure that the sample pole piece can be completely immersed in acetone. This process needs to be completed within a few seconds to minimize the volatilization of the electrolyte during the sampling process.

[0077] After soaking for 2-5 days, take the electrolyte sample diluted with acetone and send it to gas chromatography and ion chromatography to detect the proportion of solvent and lithium salt concentration in each sample. Thus, the content change pattern of each solvent and lithium salt in different height directions can be obtained.

[0078] In addition, the component to be tested may also be a core having 3 to 10 layers.

[0079] In one embodiment, the battery material testing device further includes a pad, which is disposed between the first clamping plate 11 and the second clamping plate 12 , and the first receiving groove and the second receiving groove are opened on the pad.

[0080] In this specific example, for example, the first splint 11 and the second splint 12 are both made of transparent material, such as tempered glass; the surfaces of the first splint 11 and the second splint 12 are flat; a pad is arranged between the first splint 11 and the second splint 12, and the pad is processed to be assembled with the first splint 11 and the second splint 12 to form the required first receiving groove and second receiving groove; the pad can be, for example, an aluminum plate.

[0081] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0082] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery material testing device, characterized in that: The battery material testing device comprises: A clamping plate assembly (1), the clamping plate assembly (1) comprising a first clamping plate (11) and a second clamping plate (12), the first clamping plate (11) and the second clamping plate (12) being detachably connected via a fastener; A first receiving groove and a second receiving groove are formed between the first clamping plate (11) and the second clamping plate (12), the first receiving groove is used to place the component to be tested, the second receiving groove is used to hold the test solution, and the first receiving groove and the second receiving groove are communicated with each other.

2. The battery material testing device according to claim 1, characterized in that: The first clamping plate (11) has a first surface (110), the first surface (110) is provided with a first sub-groove (111) and a second sub-groove (112), and the first sub-groove (111) and the second sub-groove (112) are isolated from each other; The second clamping plate (12) has a second surface (120), the second surface (120) is provided with a third sub-groove (121) and a fourth sub-groove (122), and the third sub-groove (121) and the fourth sub-groove (122) are communicated with each other; When the first clamping plate (11) and the second clamping plate (12) are connected, the first surface (110) and the second surface (120) fit each other; the first sub-groove (111) and the third sub-groove (121) are spliced ​​to form the first receiving groove; the second sub-groove (112) and the fourth sub-groove (122) are spliced ​​to form the second receiving groove.

3. The battery material testing device according to claim 2, characterized in that: The second surface (120) is provided with a sealing groove (123), and the sealing groove (123) is arranged on the outer periphery of the third sub-groove (121) and the fourth sub-groove (122); The clamping plate assembly (1) further comprises a sealing ring (13), wherein the sealing ring (13) is partially accommodated in the sealing groove (123), and when the first clamping plate (11) and the second clamping plate (12) are connected, the sealing ring (13) abuts against the first surface (110).

4. The battery material testing device according to claim 2, characterized in that: The second clamping plate (12) is provided with a liquid injection hole (1200), and the liquid injection hole (1200) is connected to the fourth sub-groove (122).

5. The battery material testing device according to claim 2, characterized in that: The number of the first sub-grooves (111) and the number of the second sub-grooves (112) are both at least two, and the first sub-grooves (111) and the second sub-grooves (112) are arranged in a one-to-one correspondence; The number of the third sub-grooves (121) and the number of the fourth sub-grooves (122) are both at least two, and the third sub-grooves (121) and the fourth sub-grooves (122) are arranged in a one-to-one correspondence.

6. The battery material testing device according to claim 2, characterized in that: The clamping plate assembly (1) further comprises a gasket, which is arranged in the first sub-groove (111) or the third sub-groove (121), and is configured to adjust the depth of the first receiving groove.

7. The battery material testing device according to any one of claims 1 to 6, characterized in that: At least one of the first clamping plate (11) and the second clamping plate (12) is made of a transparent material.

8. The battery material testing device according to claim 1, characterized in that: The battery material testing device also includes a fixing seat (2), and the clamping plate assembly (1) is installed on the fixing seat (2) so that the first containing slot and the second containing slot are in a vertical posture.

9. The battery material testing device according to claim 8, characterized in that: The fixing seat (2) comprises a supporting platform (21) and a fixed baffle (22), wherein the supporting platform (21) has a supporting surface (210), at least two fixed baffles (22) are provided, at least two fixed baffles (22) are provided on the supporting surface (210), and at least two fixed baffles (22) form a gap portion (200) in a first direction, the clamping plate assembly (1) is installed in the gap portion (200), and the clamping plate assembly (1) is in abutment with the fixed baffle (22); the first direction corresponds to the thickness direction of the first clamping plate (11) and the second clamping plate (12).

10. The battery material testing device according to claim 9, characterized in that: Along a first direction, the fixed baffle (22) is movably connected to the supporting surface (210).

11. The battery material testing device according to claim 9, characterized in that: The fixing seat (2) further comprises at least two supporting legs (23), at least two of the supporting legs (23) are connected to the supporting platform (21), and at least two of the supporting legs (23) are arranged opposite to the supporting surface (210); the supporting legs (23) are height-adjustable supporting legs.

12. The battery material testing device according to claim 1, characterized in that: The battery material testing device also includes a pad, which is arranged between the first clamping plate (11) and the second clamping plate (12), and the first accommodating groove and the second accommodating groove are opened on the pad.

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