阅读说明：本技术 测试装置及测试方法 (Test device and test method ) 是由 陈继钦 程忠 林峰 陈守敏 褚春波 张耀 于 2021-07-05 设计创作，主要内容包括：本申请公开了一种测试装置及测试方法,用于测试材料样品对电解液的浸润性及保液能力,其中测试装置包括称重组件、样品固定组件、滴液组件及托盘组件,称重组件用于获取材料样品及材料样品上保留的电解液的重量信息；样品固定组件包括受力夹具,受力夹具包括两个相互平行的夹板,夹板垂直于称重台,两个夹板用于夹持材料样品；滴液组件位于受力夹具的上方,滴液组件用于将电解液滴至材料样品上；托盘组件包括托盘,托盘位于受力夹具的下方,托盘用于盛接从材料样品上滴落的电解液。设置受力夹具,通过两个夹板夹持材料样品,能够使材料样品在测试过程中处于挤压状态,使测试条件更接近实际使用情况,提高测试结果的准确性。(The application discloses a testing device and a testing method, which are used for testing the wettability and the liquid retention capacity of a material sample on electrolyte, wherein the testing device comprises a weighing component, a sample fixing component, a liquid dropping component and a tray component, and the weighing component is used for acquiring the weight information of the material sample and the electrolyte reserved on the material sample; the sample fixing assembly comprises a stressed clamp, the stressed clamp comprises two clamping plates which are parallel to each other, the clamping plates are perpendicular to the weighing platform, and the two clamping plates are used for clamping a material sample; the dropping liquid assembly is positioned above the stressed clamp and is used for dropping the electrolyte onto the material sample; the tray assembly comprises a tray, the tray is located below the stress fixture, and the tray is used for containing electrolyte dripping from a material sample. Set up the atress anchor clamps, through two splint centre gripping material samples, can make material sample be in the extrusion state in the testing process, make the testing condition more be close to the actual use condition, improve the accuracy of test result.)

1. Testing arrangement for test material sample is to infiltration nature and the ability of guaranteeing liquid of electrolyte, its characterized in that includes:

the weighing assembly comprises a weighing platform and is used for acquiring the material sample and the weight information of the electrolyte reserved on the material sample;

the sample fixing assembly comprises a stressed clamp, the stressed clamp is connected to the weighing platform and is positioned above the weighing platform, the stressed clamp comprises two clamping plates which are parallel to each other, the clamping plates are perpendicular to the weighing platform, and the two clamping plates are used for clamping and pressing the material sample;

a drop assembly positioned above the force-bearing clamp, the drop assembly for dropping electrolyte onto the material sample;

and the tray assembly comprises a tray, the tray is positioned below the stressed clamp, and the tray is used for containing the electrolyte dripped from the material sample.

2. The testing device of claim 1, wherein the weighing assembly further comprises a processing module coupled to the weighing station, the processing module configured to obtain and output the weight information.

3. The testing device of claim 1, wherein the force-bearing clamp further comprises an adjustment member connected to both of the clamping plates for adjusting the pressure applied by both of the clamping plates to the material sample.

4. The testing device of claim 3, wherein the force-bearing clamp further comprises a pressure sensor coupled to the clamping plate, the pressure sensor configured to sense a pressure applied to the material sample by the clamping plate.

5. The testing device of claim 1, wherein the sample holding assembly further comprises a sample holder coupled to and above the weighing station, the sample holder configured to support the material sample.

6. The testing device of claim 1, wherein the sample holding assembly further comprises a fixture mounting plate coupled to the weighing station, the fixture mounting plate being perpendicular to the weighing station, at least one of the clamping plates being mounted to the fixture mounting plate.

7. The testing device of claim 1, wherein the liquid dropping assembly comprises a liquid storage tube and a pushing member, the liquid storage tube is used for containing the electrolyte, the liquid storage tube has a liquid outlet end and a pushing end, the liquid outlet end is located above the stressed fixture, the pushing member is partially contained in the liquid storage tube, the pushing member is partially exposed out of the pushing end, and the pushing member can move along the liquid storage tube to enable the electrolyte to flow out of the liquid outlet end.

8. The testing device of claim 1, wherein the tray assembly further comprises a cradle for supporting the tray, one end of the cradle being attached to the tray and the other end of the cradle avoiding the weighing station.

9. The testing device of any one of claims 1 to 8, further comprising a housing, the weighing station and the sample holding assembly being housed within an interior of the housing, the drip assembly being coupled to the housing, at least a portion of the drip assembly being located within the interior of the housing.

10. The test method is used for testing the wettability and the liquid retention capacity of a material sample on electrolyte, and is characterized by comprising the following steps of:

preparing the material sample;

applying pressure to the material sample to place the material sample in a compressed state;

dropwise adding the electrolyte to the material sample;

acquiring weight information of the material sample and the electrolyte reserved on the material sample at set time intervals;

and calculating the wettability and the liquid retention capacity of the material sample according to the weight information.

Technical Field

The application relates to the technical field of power batteries, in particular to a testing device and a testing method.

Background

In the interior of a lithium ion battery, positive and negative pole pieces and a diaphragm are immersed in an electrolyte, the wettability and the liquid retention capability of materials of structures such as the positive and negative pole pieces and the diaphragm are related to the performance of the lithium ion battery, and if the liquid retention capability of the positive and negative pole pieces and the diaphragm is insufficient, black spots, lithium precipitation and other conditions can occur in the using process, so that irreversible capacity loss is caused, the service life of the lithium ion battery is influenced, and therefore, the wettability and the liquid retention capability of the positive and negative pole pieces, the diaphragm, a bare cell and the like need to be tested. In the related technology, methods such as a contact angle method, an immersion method, a liquid climbing method and the like are usually adopted to test the wettability and the liquid retention capacity, and the wettability and the liquid retention capacity of a material sample can only be tested under the condition of no stress, but structures such as a positive plate, a negative plate, a diaphragm, a bare cell and the like are in an extrusion state in actual use, so that the difference between a test result and the actual use condition is large, and the test result is not accurate enough.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a testing device, which can enable the testing conditions to be closer to the actual use condition and improve the accuracy of the testing result.

The application also provides a test method.

The testing device provided by the embodiment of the first aspect of the application is used for testing the wettability and the liquid retention capacity of a material sample on electrolyte, and comprises a weighing component, a sample fixing component, a dropping component and a tray component, wherein the weighing component comprises a weighing table, and the weighing component is used for acquiring the material sample and the weight information of the electrolyte retained on the material sample; the sample fixing assembly comprises a stressed clamp, the stressed clamp is connected to the weighing platform and is positioned above the weighing platform, the stressed clamp comprises two clamping plates which are parallel to each other, the clamping plates are perpendicular to the weighing platform, and the two clamping plates are used for clamping and pressing the material sample; a drop assembly positioned above the force-bearing clamp, the drop assembly for dropping electrolyte onto the material sample; the tray assembly comprises a tray, the tray is located below the stress clamp, and the tray is used for containing the electrolyte dripped from the material sample.

The test device provided by the embodiment of the first aspect of the application has at least the following beneficial effects: set up the atress anchor clamps, through two splint centre gripping material samples, can make material sample be in the extrusion state in the testing process, make the testing condition more be close to the actual use condition, improve the accuracy of test result.

In some embodiments of the present application, the weighing assembly further comprises a processing module connected to the weighing station, the processing module configured to obtain and output the weight information.

In some embodiments of the present application, the force-receiving clamp further comprises an adjusting member connected to the two clamping plates, the adjusting member being configured to adjust the pressure applied to the material sample by the two clamping plates.

In some embodiments of the present application, the force-bearing clamp further comprises a pressure sensor coupled to the clamping plate, the pressure sensor being configured to sense a pressure applied to the material sample by the clamping plate.

In some embodiments of the present application, the sample holding assembly further comprises a sample holder coupled to and above the weighing station, the sample holder for supporting the material sample.

In some embodiments of the present application, the sample holding assembly further comprises a clamp holding plate connected to the weighing station, the clamp holding plate being perpendicular to the weighing station, at least one of the clamping plates being mounted to the clamp holding plate.

In some embodiments of this application, the dropping liquid subassembly includes liquid storage pipe and propelling movement spare, the liquid storage pipe is used for the holding electrolyte, the liquid storage pipe has a liquid end and propelling movement end, it is located to go out the liquid end the top of atress anchor clamps, propelling movement spare part hold in the inside of liquid storage pipe, propelling movement spare part expose in the propelling movement end, propelling movement spare can be followed the liquid storage pipe removes so that electrolyte by it flows to go out the liquid end.

In some embodiments of the present application, the tray assembly further includes a support for supporting the tray, one end of the support being connected to the tray and the other end of the support avoiding the weighing station.

In some embodiments of the present application, the testing device further includes a housing, the weighing station and the sample holding assembly are housed in an interior of the housing, the drip assembly is connected to the housing, and at least a portion of the drip assembly is located in the interior of the housing.

The test method provided by the embodiment of the second aspect of the application is used for testing the wettability and the liquid retention capacity of a material sample on electrolyte, and comprises the following steps: preparing the material sample; applying pressure to the material sample to place the material sample in a compressed state; dropwise adding the electrolyte to the material sample; every set time, the weighing component obtains the material sample and the weight information of the electrolyte reserved on the material sample; and calculating the wettability and the liquid retention capacity of the material sample according to the weight information.

The test method provided by the embodiment of the second aspect of the application has at least the following beneficial effects: the electrolyte is dripped after pressure is applied to the material sample, so that the extrusion state of the material sample in actual use can be simulated in the test process, the test condition is closer to the actual use condition, and the accuracy of the test result is improved.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic perspective view of a testing apparatus provided in an embodiment of the first aspect of the present application;

FIG. 2 is a front view of the test apparatus of FIG. 1;

FIG. 3 is a top view of the sample holding assembly of the testing device of FIG. 1;

FIG. 4 is a cross-sectional view of a clamping plate of the testing device of FIG. 1;

FIG. 5 is a flowchart of a testing method provided in an embodiment of the second aspect of the present application;

FIG. 6 is a schematic diagram of the wettability and the liquid retention capability of a bare cell of 2.0Ah under different stresses obtained by the test method shown in FIG. 5;

fig. 7 is a schematic diagram of wettability and liquid retention capability of different materials in a bare cell of 2.0Ah under a force of 5000kgf, which is obtained by the testing method shown in fig. 5.

Reference numerals:

the device comprises a weighing assembly 100, a weighing platform 110, a processing module 120, a sample fixing assembly 200, a stressed clamp 210, a clamping plate 211, a hydrophobic layer 2111, an antirust layer 2112, an adjusting piece 212, a bolt 2121, a nut 2122, a pressure sensor 213, a sample support 220, a clamp fixing plate 230, a dripping assembly 300, a liquid storage pipe 310, a liquid outlet end 311, a pushing end 312, a pushing piece 320, a tray assembly 400, a tray 410, a support 420, a shell 500, a shell 510, a cover 520, a sealing piece 530 and a material sample 600.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions referred to, for example, the directions or positional relationships indicated above, below, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

Reference throughout this specification to the description of "one embodiment," "some embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The testing device provided by the embodiment of the application is used for testing the wettability and the liquid retention capacity of a material sample 600 to electrolyte, the testing device comprises a weighing component 100, a sample fixing component 200, a dropping component 300 and a tray component 400, the weighing component 100 comprises a weighing table 110, and the weighing component 100 is used for acquiring the material sample 600 and the weight information of the electrolyte reserved on the material sample 600; the sample fixing assembly 200 includes a force-receiving fixture 210, the force-receiving fixture 210 is connected to the weighing platform 110 and located above the weighing platform 110, the force-receiving fixture 210 includes two parallel clamping plates 211, the clamping plates 211 are perpendicular to the weighing platform 110, and the two clamping plates 211 are used for clamping the material sample 600 to be pressed; the dropping assembly 300 is located above the force-bearing clamp 210, and the dropping assembly 300 is used for dropping the electrolyte onto the material sample 600; the tray assembly 400 includes a tray 410, the tray 410 being positioned below the force-receiving fixture 210, the tray 410 being adapted to receive electrolyte dripping from the material sample 600.

For example, as shown in fig. 1 to 2, the testing apparatus includes a weighing assembly 100, a sample fixing assembly 200, a dropping assembly 300 and a tray assembly 400, the weighing assembly 100 includes a weighing platform 110, and the weighing assembly 100 is used for acquiring weight information of a material sample 600 and electrolyte retained on the material sample 600; the sample fixing assembly 200 includes a force-receiving fixture 210, the force-receiving fixture 210 is connected to the weighing platform 110 and located above the weighing platform 110, the force-receiving fixture 210 includes two parallel clamping plates 211, the clamping plates 211 are perpendicular to the weighing platform 110, and the two clamping plates 211 are used for clamping the material sample 600 to be pressed; the dropping assembly 300 is located above the force-bearing clamp 210, and the dropping assembly 300 is used for dropping the electrolyte onto the material sample 600; the tray assembly 400 includes a tray 410, the tray 410 being positioned below the force-receiving fixture 210, the tray 410 being adapted to receive electrolyte dripping from the material sample 600.

When the material sample processing device is used, the material sample 600 is clamped between the two clamping plates 211, the material sample 600 is pressed, the dripping component 300 drips electrolyte onto the material sample 600, the weight information of the material sample 600 acquired by the processing module 120 is recorded for multiple times within a period of time, and the wettability and the liquid retention capacity of the material sample 600 are calculated according to the weight change value of the material sample 600. Set up atress anchor clamps 210, through two splint 211 centre gripping material sample 600, can make material sample 600 be in the extrusion state in the testing process, make the testing condition more close actual use condition, improve the accuracy of test result.

It is understood that the weighing assembly 100 may be an electronic balance. The gravity of the tray 410 should act on the outside of the weighing platform 110 to prevent the weight of the excess electrolyte not absorbed by the material sample 600 from affecting the weighing result of the material sample 600 by the weighing assembly 100, thereby further improving the accuracy of the test result; the tray 410 should be made of corrosion-resistant material to prevent the electrolyte from corroding the tray 410; the tray 410 is sized to store excess electrolyte that flows down the material sample 600 during testing. The surface of the clamping plate 211 can be provided with a hydrophobic layer 2111 and an anti-rust layer 2112, the hydrophobic layer 2111 can reduce the residue of electrolyte on the surface of the clamping plate 211, so that the influence of the weight of the residual electrolyte on the reading of the weighing assembly 100 is reduced, and the accuracy of the test result is further improved; the antirust layer 2112 can prevent the electrolyte from corroding the splint 211, and the service life of the splint 211 is prolonged. The arrangement form of the hydrophobic layer 2111 and the antirust layer 2112 is not limited, for example, the chucking plate 211 may have both the hydrophobic layer 2111 and the antirust layer 2112, with reference to fig. 4, the hydrophobic layer 2111 is arranged at the outermost layer; a material having both hydrophobic property and rust preventive property may be used to form a plating layer, which can serve as both the hydrophobic layer 2111 and the rust preventive layer 2112.

It can be understood that the material sample 600 may be a positive electrode plate, a negative electrode plate, a diaphragm, or a bare cell manufactured by winding, lamination, or other processes; the electrolyte can be at least one of an organic solvent, a lithium salt and an additive, wherein the organic solvent can be ethylene carbonate, propylene carbonate, diethyl carbonate and the like, the lithium salt can be lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate and the like, and the additive can be a film forming additive, a conductive additive, a flame retardant additive and the like.

It should be noted that the weighing assembly 100 further includes a processing module 120, the processing module 120 is connected to the weighing platform 110, and the processing module 120 is used for acquiring and outputting the weight information.

For example, as shown in fig. 1 to fig. 2, the weighing assembly 100 further includes a processing module 120, the processing module 120 is connected to the weighing platform 110, the processing module 120 is configured to obtain and output weight information, and calculate wettability and liquid retention capability of the material sample 600 according to the weight information output by the processing module 120.

It is understood that the form of the weight information output by the processing module 120 is not limited, and may be set according to actual requirements, for example, the processing module 120 may be set to output the material sample 600 and the weight change of the electrolyte retained on the material sample 600 in a line graph form, so as to visually represent the wettability and the liquid retention capability of the material sample 600.

It should be noted that the force-bearing clamp 210 further includes an adjusting member 212, the adjusting member 212 is connected to the two clamping plates 211, and the adjusting member 212 is used for adjusting the pressure applied to the material sample 600 by the two clamping plates 211.

For example, as shown in fig. 1 to 3, the force-bearing fixture 210 further includes an adjusting member 212, the adjusting member 212 is connected to the two clamping plates 211, and the adjusting member 212 can adjust the pressure applied to the material sample 600 by the two clamping plates 211 to adjust different testing conditions and test the wettability and the liquid retention capability of the material sample 600 under different force-bearing conditions.

It is understood that, referring to fig. 3, the adjusting member 212 may include a bolt 2121 and a nut 2122, the bolt 2121 is inserted into the two clamping plates 211, the nut 2122 is disposed outside one of the clamping plates 211, and the position of the nut 2122 on the bolt 2121 is adjusted by rotating the nut 2122, so as to adjust the pressure applied to the material sample 600 by the two clamping plates 211.

It should be noted that the force-bearing clamp 210 further includes a pressure sensor 213, the pressure sensor 213 is connected to the clamping plate 211, and the pressure sensor 213 is used for sensing the pressure applied to the material sample 600 by the clamping plate 211.

For example, as shown in fig. 1-3, the force-receiving clamp 210 further includes a pressure sensor 213, the pressure sensor 213 is connected to the clamping plate 211, and the pressure sensor 213 is capable of sensing the pressure applied to the material sample 600 by the clamping plate 211, thereby quantitatively adjusting the pressure applied to the material sample 600 by the clamping plate 211.

It is to be understood that the pressure sensor 213 may employ a semiconductor piezoelectric resistance type sensor, an electrostatic capacity type sensor, or the like. The position where the pressure sensor 213 is connected is not limited, and may be a position where the pressure applied to the material sample 600 by the clamp plate 211 can be sensed, and for example, referring to fig. 3, the pressure sensor 213 may be connected to a contact surface between the clamp plate 211 and the material sample 600.

It should be noted that the sample holding assembly 200 further includes a sample holder 220, the sample holder 220 is connected to the weighing station 110 and located above the weighing station 110, and the sample holder 220 is used for supporting the material sample 600.

For example, as shown in fig. 1 to 3, the sample fixing assembly 200 further includes a sample holder 220, the sample holder 220 is connected to the weighing platform 110 and located above the weighing platform 110, the sample holder 220 can support the material sample 600 under the condition that the clamping plate 211 has no acting force on the material sample 600, the wettability and the liquid retention capability of the material sample 600 can be tested without any pressing, the range of the conditions which can be tested by the testing device can be expanded, and thus more comprehensive information of the wettability and the liquid retention capability of the material sample 600 under different conditions can be obtained.

It can be understood that one end of the sample holder 220 for supporting the material sample 600 can be located between the two clamping plates 211, the material sample 600 can be placed on the sample holder 220 first, and then the pressure applied to the material sample 600 by the clamping plates 211 is adjusted, so that the stability of the material sample 600 during the adjustment process is ensured, and the material sample 600 can be prevented from falling accidentally when the pressure applied to the material sample 600 by the clamping plates 211 is insufficient. The manner in which the sample holder 220 supports the material sample 600 is not limited, and the supporting manner may be set according to actual requirements, for example, referring to fig. 3, in order to reflect the relationship between the sample holder 220 and the material sample 600, the bolt 2121 is processed in a perspective manner, and the end of the sample holder 220 may be set to abut against the material sample 600, so as to provide a support for the material sample 600.

It should be noted that the sample fixing assembly 200 further includes a fixture fixing plate 230, the fixture fixing plate 230 is connected to the weighing platform 110, the fixture fixing plate 230 is perpendicular to the weighing platform 110, and at least one clamping plate 211 is mounted to the fixture fixing plate 230.

For example, as shown in fig. 1 to 3, the sample holding assembly 200 further includes a jig fixing plate 230, the jig fixing plate 230 being coupled to the weighing table 110, the jig fixing plate 230 being perpendicular to the weighing table 110, one clamping plate 211 being mounted to the jig fixing plate 230, the two clamping plates 211 being coupled to each other by an adjustment member 212. The fixture fixing plate 230 can stably support the stressed fixture 210, and one clamping plate 211 is arranged on the fixture fixing plate 230 which is vertical to the weighing platform 110, so that the clamping plate 211 is vertical to the weighing platform 110, and the installation is convenient.

It is understood that in the case where the adjusting member 212 or other connecting member is connected between the two clamping plates 211, only one clamping plate 211 may be mounted to the jig fixing plate 230; in the case where the two clamp plates 211 are not connected to each other by other members, both clamp plates 211 may be mounted on the jig fixing plate 230 with a certain interval between the two clamp plates 211. The installation form can be set according to actual requirements. Referring to fig. 3, in a case where the two clamping plates 211 are coupled by a bolt 2121 and a nut 2122, the bolt 2121 may be sequentially inserted through the jig fixing plate 230 and the two clamping plates 211.

It should be noted that the dropping assembly 300 includes a liquid storage tube 310 and a pushing member 320, the liquid storage tube 310 is used for containing electrolyte, the liquid storage tube 310 has a liquid outlet end 311 and a pushing end 312, the liquid outlet end 311 is located above the force-bearing fixture 210, a part of the pushing member 320 is contained in the liquid storage tube 310, a part of the pushing member 320 is exposed out of the pushing end 312, and the pushing member 320 can move along the liquid storage tube 310 so as to make the electrolyte flow out of the liquid outlet end 311.

For example, as shown in fig. 1 to 2, the dropping assembly 300 includes a liquid storage tube 310 and a pushing member 320, the liquid storage tube 310 is used for containing electrolyte, the liquid storage tube 310 has a liquid outlet 311 and a pushing end 312, the liquid outlet 311 is located above the force-bearing fixture 210, a part of the pushing member 320 is contained in the liquid storage tube 310, a part of the pushing member 320 is exposed out of the pushing end 312, the pushing member 320 can move along the liquid storage tube 310 to allow the electrolyte to flow out from the liquid outlet 311, the pushing member 320 can be gradually pushed to allow the electrolyte to slowly drop onto the material sample 600, and the electrolyte cannot be sufficiently absorbed by the material sample 600 due to excessive electrolyte dropping at one time is prevented, so that waste of the electrolyte is reduced.

It can be understood that the driving member can be arranged to drive the pushing member 320 to move stably, so that the electrolyte can be uniformly dropped onto the material sample 600, and the uniformity of the dropping process of the electrolyte can be improved; the weight change of the material sample 600 at different times may be recorded multiple times to obtain more detailed test results. The outlet 311 is located directly above the gap between the two clamping plates 211 to ensure that the electrolyte directly drips onto the material sample 600 between the two clamping plates 211.

It should be noted that the tray assembly 400 further includes a bracket 420, the bracket 420 is used for supporting the tray 410, one end of the bracket 420 is connected to the tray 410, and the other end of the bracket 420 faces away from the weighing station 110.

For example, as shown in fig. 1 to 2, the tray assembly 400 further includes a bracket 420, the bracket 420 is used for supporting the tray 410, one end of the bracket 420 is connected to the tray 410, and the other end of the bracket 420 is away from the weighing platform 110, so that the bracket 420 can both keep the stability of the tray 410 during the test process and ensure that the gravity of the tray 410 acts on the outside of the weighing platform 110, and prevent the weight of the excess electrolyte not absorbed by the material sample 600 from affecting the weighing result of the weighing assembly 100 on the material sample 600, thereby further improving the accuracy of the test result.

It will be appreciated that the bracket 420 may be attached to the tray 410 at one end and attached to any location outside of the weighing station 110 at the other end, for example, with reference to fig. 1-2, to a surface of the processing module 120.

It should be noted that the testing device may further include a housing 500, the weighing platform 110 and the sample fixing assembly 200 are accommodated in the housing 500, the dropping assembly 300 is connected to the housing 500, and at least a portion of the dropping assembly 300 is located in the housing 500.

For example, as shown in fig. 1 to 2, the testing device further includes a housing 500, the weighing platform 110 and the sample fixing assembly 200 are accommodated in the housing 500, the drip assembly 300 is connected to the housing 500, and a portion of the drip assembly 300 is located in the housing 500. The housing 500 can provide a sealed environment for the testing process of the material sample 600, prevent the material sample 600 from being polluted in the testing process, and improve the accuracy of the testing result.

It is understood that the structure of the housing 500 is not limited, and may be configured according to actual requirements, for example, referring to fig. 1 to 2, the housing 500 may include a housing 510 and a cover 520, the weighing platform 100 and the sample fixing assembly 200 may be disposed above the cover 520, the dropping assembly 300 may be connected to the housing 510, and the housing 510 may be snapped over the cover 520 to form a closed environment. The housing 510 may be made of a transparent material such as glass or acrylic, to facilitate observation of the test process.

It is understood that the housing 500 may further include a sealing member 530, and referring to fig. 1 to 2, the sealing member 530 is clamped between the housing 510 and the cover 520 to maintain the inner space of the housing 500 to be sealed, so as to further improve the cleanliness of the inner environment during the test process, thereby further improving the accuracy of the test result. The sealing member 530 may be made of silicon rubber, or the like.

It is understood that the dropping assembly 300 may be partially located inside the housing 500, or may be entirely located inside the housing 500, in some embodiments, the dropping assembly 300 includes a liquid storage tube 310 and a pushing member 320, the liquid storage tube 310 is used for containing an electrolyte, the liquid storage tube 310 has a liquid outlet end 311 and a pushing end 312, the liquid outlet end 311 is located above the force-bearing fixture 210, the pushing member 320 is partially contained inside the liquid storage tube 310, the pushing member 320 is partially exposed at the pushing end 312, the pushing member 320 can move along the liquid storage tube 310 to allow the electrolyte to flow out from the liquid outlet end 311, at least the liquid outlet end 311 of the liquid storage tube 310 should be located inside the housing 500, so as to drop the electrolyte to the material sample 600 through the liquid outlet end 311; the pushing member 320 may be partially located outside the casing 500 to facilitate the operation of dropping the electrolyte by the tester; in the above embodiment, the reservoir 310 should be connected to the housing 500.

It will be appreciated that in some embodiments, the tray assembly 400 further includes a bracket 420, the bracket 420 being configured to support the tray 410, one end of the bracket 420 being coupled to the tray 410, and the other end of the bracket 420 being coupled to an inner wall of the housing 500 to avoid the weighing station 110 to ensure that the weight of the tray 410 acts outside of the weighing station 110.

The testing method provided by the embodiment of the second aspect of the present application is used for testing the wettability and the liquid retention capability of the material sample 600 to the electrolyte, and includes the steps of:

s100, preparing a material sample 600;

s200, applying pressure to the material sample 600 to enable the material sample 600 to be in a pressed state;

s300, dropwise adding electrolyte to the material sample 600;

s400, acquiring the material sample 600 and the weight information of the electrolyte reserved on the material sample 600 at set time intervals;

and S500, calculating the wettability and the liquid retention capacity of the material sample 600 according to the weight information.

For example, as shown in fig. 5, the test method includes the steps of: s100, preparing a material sample 600; s200, applying pressure to the material sample 600 to enable the material sample 600 to be in a pressed state; s300, dropwise adding electrolyte to the material sample 600; s400, acquiring the material sample 600 and the weight information of the electrolyte reserved on the material sample 600 at set time intervals; and S500, calculating the wettability and the liquid retention capacity of the material sample 600 according to the weight information. The electrolyte is dripped after pressure is applied to the material sample 600, so that the extrusion state of the material sample 600 in actual use can be simulated in the test process, the test condition is closer to the actual use condition, and the accuracy of the test result is improved.

It is understood that the setting time in S400 is not limited, and may be set according to actual requirements. In the step S300, electrolyte can be dripped at a constant speed, so that the stability in the testing process is improved.

It is understood that the test method may further comprise the steps of:

s600, after the material sample 600 is prepared, before the electrolyte is added to the material sample 600, the reading of the weighing assembly 100 is zeroed.

For example, referring to fig. 1 to 2, the weighing assembly 100 is used to obtain the weight information of the material sample 600 and the electrolyte remaining on the material sample 600, as shown in fig. 5, the testing method further includes the steps of: s600, after the material sample 600 is fixed on the sample support 220 and before the electrolyte is dripped into the material sample 600, the reading of the weighing component 100 is reset to zero, and in the subsequent S400 step, the weight information acquired by the weighing component 100 is only the weight of the electrolyte reserved on the material sample 600, so that the wettability and the liquid retention capacity of the material sample 600 can be more intuitively represented.

The concept and the resulting technical effects of the test method provided by the second aspect of the present application will be clearly and completely described below with reference to the embodiments, so as to fully understand the objects, features and effects of the test method provided by the second aspect of the present application. Obviously, the described embodiments are only a part of the embodiments of the testing method provided in the second aspect of the present application, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the testing method provided in the second aspect of the present application are within the scope of protection of the present application.

The test apparatus shown in fig. 1 to 2 was used to perform wettability and liquid retention tests on the material sample 600, wherein,

example 1

Taking a wound 2.0Ah bare cell;

fixing the wound 2.0Ah bare cell on a sample bracket 220 and placing the bare cell between two clamping plates 211;

adjusting the clamping plate 211 to enable the bare cell to be pressed by 30000 kgf;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of the above outputs are shown in fig. 6, and the final wettability and liquid retention capacity of the 2.0Ah bare cell under a pressure of 30000kgf are 8.6411 g.

Example 2

Taking a wound 2.0Ah bare cell;

fixing the wound 2.0Ah bare cell on a sample bracket 220 and placing the bare cell between two clamping plates 211;

adjusting the clamping plate 211 to enable the naked battery cell to be stressed by 10000kgf of pressure;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of each output are shown in fig. 6, and the final wettability and liquid retention capacity of the 2.0Ah bare cell under the pressure of 10000kgf are 10.6103 g.

Example 3

Taking a wound 2.0Ah bare cell;

fixing the wound 2.0Ah bare cell on a sample bracket 220 and placing the bare cell between two clamping plates 211;

adjusting the clamping plate 211 to enable the naked battery cell to be stressed by 5000kgf pressure;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information outputted at each time are shown in fig. 6 and 7, and the final wettability and liquid retention capacity of the 2.0Ah bare cell under a pressure of 5000kgf are 11.76 g.

Example 4

Taking a wound 2.0Ah bare cell;

fixing the wound 2.0Ah bare cell on a sample bracket 220 and placing the bare cell between two clamping plates 211;

adjusting the clamping plate 211 to enable the naked battery cell to be stressed by 1000 kgf;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of the above outputs are shown in fig. 6, and the final wettability and liquid retention capacity of the 2.0Ah bare cell under a pressure of 1000kgf is 13.0156 g.

Example 5

Taking a wound 2.0Ah bare cell;

fixing the wound 2.0Ah bare cell on a sample bracket 220 and placing the bare cell between two clamping plates 211;

adjusting the clamping plate 211 to enable the naked battery cell to be pressed by 0 kgf;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of the above outputs are shown in fig. 6, and the final wettability and liquid retention capacity of the 2.0Ah bare cell under a pressure of 0kgf is 14.1712 g.

Example 6

Taking a wound positive pole piece which is consistent with the specification of the positive pole piece in the 2.0Ah bare cell;

fixing the wound positive pole piece on a sample bracket 220 and placing the positive pole piece between two clamping plates 211;

adjusting the clamping plate 211 to enable the positive pole piece to be stressed by 5000kgf pressure;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of each output are shown in fig. 7, and the final wettability and the liquid retention capacity of the positive electrode sheet under a pressure of 5000kgf are 5.4432 g.

Example 7

Taking a wound negative pole piece which is consistent with the specification of the negative pole piece in the 2.0Ah bare cell;

fixing the wound negative pole piece on a sample bracket 220 and placing the negative pole piece between two clamping plates 211;

adjusting the clamping plate 211 to enable the negative pole piece to be pressed by 5000 kgf;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of each output are shown in fig. 7, and the final wettability and liquid retention capacity of the negative electrode sheet under a pressure of 5000kgf is 4.3521 g.

Example 8

Taking a coiled diaphragm which has the same specification with the diaphragm in the 2.0Ah naked electric core;

the wound membrane is fixed on a sample holder 220 and placed between two clamping plates 211;

adjusting the clamping plate 211 to subject the diaphragm to a pressure of 5000 kgf;

zeroing the reading of the weighing assembly 100;

dropwise adding electrolyte to the bare cell at a speed of 2g per 1 minute;

recording the weight information output by the weighing component 100 every 1 minute;

the calculation results obtained from the weight information of each output are shown in fig. 7, and the final wettability and liquid retention capacity of the diaphragm at a pressure of 5000kgf was 2.6951 g.

According to embodiments 1 to 5, schematic diagrams of the wettability and the liquid retention capability of the bare cell of 2.0Ah under different stresses as shown in fig. 6 can be obtained; according to the embodiment 3 and the embodiments 6 to 8, schematic diagrams of wettability and liquid retention capability of different materials in a bare cell of 2.0Ah under a force of 5000kgf shown in fig. 7 can be obtained.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.