CN110672470A

CN110672470A - Pole piece infiltration testing method and device of secondary battery

Info

Publication number: CN110672470A
Application number: CN201810716270.0A
Authority: CN
Inventors: 张馨元; 魏奕民; 侯志强; 兰启宁; 龚雪清
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2020-01-10
Anticipated expiration: 2038-07-03
Also published as: CN110672470B

Abstract

The invention relates to a pole piece infiltration testing method and a pole piece infiltration testing device for a secondary battery. The pole piece infiltration testing method of the secondary battery comprises the following steps: (a) sucking a predetermined amount of electrolyte by using a micro sampler; (b) contacting the micro-sampler with a pole piece to be detected, and absorbing electrolyte in the micro-sampler by the pole piece to be detected under the capillary action; (c) and recording the absorbed amount of the electrolyte in the micro-sampler after a preset time, and quantitatively calculating the final absorption rate of the pole piece to be detected according to the absorbed amount and the ratio of the preset time. The pole piece soaking test method of the secondary battery provided by the embodiment of the invention can effectively improve the test result precision of the electrolyte absorption rate of the pole piece to be tested.

Description

Pole piece infiltration testing method and device of secondary battery

Technical Field

The invention relates to the technical field of detection equipment, in particular to a pole piece infiltration testing method and a pole piece infiltration testing device for a secondary battery.

Background

In the field of batteries, lithium batteries have the advantages of high output voltage, high specific capacity, high safety and the like, so that the lithium batteries are widely applied to portable electronic products such as computers and mobile phones and are gradually becoming the leading power source of Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV). With the increase of the use requirements of users, the requirements on the energy density and the like of lithium ion batteries are higher and higher, and the research and development of electrode materials and the design and development of battery cores become more important. The absorption capacity of the pole piece of the battery cell to the electrolyte is closely related to the dynamics, the cycle life, the safety, the reliability and other performances of the battery cell, and the understanding of the liquid absorption capacity of the pole piece is crucial to reasonably solving the liquid rising problem and controlling the electrolyte consumption problem. The soaking path of the electrolyte inside the battery cell is as follows in sequence: the free gap → the gap between the cathode and anode sheets and the isolating film → the inner hole of the cathode and anode sheets, because the injection amount of the electrolyte is much larger than the volume of the free gap inside the electric core, the infiltration speed inside the electric core will be in the process from fast to slow, and finally determined by the absorption speed of the cathode and anode sheets to the electrolyte.

However, the characterization means and experience of the liquid absorption capability of the electrode plate in the current industry are still quite deficient, the method of dropping electrolyte to observe the diffusion area or soaking electrolyte to weigh is generally adopted, the two methods have great influence on the result due to factors such as electrolyte volatilization and the like in the operation process, the error is large, and the development of the work of material selection, failure analysis and the like in the cell design process is greatly limited.

Disclosure of Invention

The embodiment of the invention provides a pole piece infiltration testing method and device of a secondary battery. The pole piece infiltration testing method of the secondary battery can effectively improve the accuracy of the test result of the electrolyte absorption rate of the pole piece to be tested.

On one hand, the embodiment of the invention provides a pole piece infiltration testing method of a secondary battery, which comprises the following steps:

(a) sucking a predetermined amount of electrolyte by using a micro sampler;

(b) contacting the micro-sampler with a pole piece to be detected, and absorbing electrolyte in the micro-sampler by the pole piece to be detected under the capillary action;

(c) and recording the absorbed amount of the electrolyte in the micro-sampler after a preset time, and quantitatively calculating the final absorption rate of the pole piece to be detected according to the absorbed amount and the ratio of the preset time.

According to one aspect of an embodiment of the invention, in step (a), the microsampler is a device that absorbs the electrolyte by capillary action.

According to an aspect of the embodiment of the present invention, step (d) is further included between step (a) and step (b): and removing the residual electrolyte on the outer wall of the micro-sampler.

According to one aspect of an embodiment of the invention, in step (a), the microsampler is a capillary tube.

According to an aspect of the embodiment of the present invention, step (a) further comprises, before step (e): taking more than two capillaries, and calibrating the relative positions of the capillaries so that the liquid taking ends of the capillaries are mutually flush.

According to an aspect of the embodiment of the present invention, in the step (e), the two or more capillaries suck the same volume of the electrolyte to each other.

According to an aspect of the embodiment of the present invention, step (c) is followed by step (f): removing the residual electrolyte in the micro sampler, and repeating the steps (a) to (c).

According to an aspect of the embodiments of the present invention, step (c) further comprises, before step (g): the amount of absorbed electrolyte in the microsampler is recorded a plurality of times before the predetermined period of time is reached, and an intermediate absorption rate is calculated from the ratio of the amount of absorbed electrolyte recorded each time to the corresponding time, to obtain a plurality of intermediate absorption rates accordingly.

The micro-sampler of the embodiment of the invention can suck a preset amount of electrolyte according to the test requirement. Where a trace is a relatively large amount, the microsampler may draw a small amount of electrolyte. Because the pole piece to be tested absorbs the electrolyte in the micro-sampler through the capillary action, and the micro-sampler can accurately absorb the electrolyte with a preset amount to perform the test work, when the micro-sampler contacts with the pole piece to be tested, the pole piece to be tested can actively absorb the electrolyte in the micro-sampler. The electrode piece to be detected absorbs a certain amount of electrolyte, and the micro-sampler releases the electrolyte with the same volume, so that the electrode piece can completely absorb the electrolyte released by the micro-sampler. Electrolyte in the micro sampler cannot actively flow out, the possibility that the electrolyte is gathered on the surface of the pole piece and cannot be completely absorbed by the pole piece to be tested is reduced, and the test result precision of the pole piece absorption rate is effectively improved. In addition, compared with the prior art in a judgment mode through manual visual inspection, the method can accurately collect the absorbed amount of the electrolyte in the micro-sampler, so that the absorbed amount of the electrolyte in the micro-sampler can be accurately calculated, the calculation error is further reduced, and the precision of the test result is improved.

In another aspect, an apparatus for testing pole piece wetting of a secondary battery according to an embodiment of the present invention includes:

the mechanical grabbing component comprises a driving part and a clamping part connected with the driving part;

the liquid storage assembly comprises an accommodating groove for accommodating electrolyte;

the driving part can drive the clamping part to clamp the micro sampler, drive the clamping part to insert the micro sampler into the accommodating groove to absorb a preset amount of electrolyte, and then contact the micro sampler with a pole piece to be tested to perform an electrolyte infiltration test;

and the data processing assembly is used for recording the absorbed amount of the electrolyte in the micro-sampler after a preset time period and calculating the final absorption rate of the pole piece to be detected according to the absorbed amount and the ratio of the preset time period.

According to the pole piece infiltration testing device of the secondary battery, the mechanical grabbing component clamps and moves the micro sampler, the predetermined amount of electrolyte can be automatically absorbed from the accommodating groove of the liquid storage component, and then the micro sampler is contacted with the pole piece to be tested to conduct infiltration testing. The data processing assembly can automatically acquire the absorbed amount and the preset time of the electrolyte in the micro-sampler and automatically calculate the final absorption rate according to the acquired data. The pole piece infiltration testing device of the secondary battery can realize the automation of operations such as liquid taking, infiltration and data recording in a test, can improve the testing work efficiency of the absorption rate of electrolyte of a pole piece to be tested, can avoid the adverse effect on a test result caused by artificial subjective judgment or data recording, is favorable for reducing the error of the test result, and increases the precision of the test result.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below by referring to the accompanying drawings.

Fig. 1 is a schematic flow chart illustrating a pole piece wetting test method of a secondary battery according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an overall structure of a pole piece wetting test of a secondary battery according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic diagram of the overall structure of a reservoir assembly according to an embodiment of the invention;

FIG. 5 is a partial enlarged view at B in FIG. 4;

FIG. 6 is a schematic view of the overall structure of a carrier assembly according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the overall structure of the calibration assembly according to an embodiment of the present invention;

FIG. 8 is a schematic view of the overall construction of a wiping assembly in accordance with one embodiment of the invention;

FIG. 9 is a schematic view of the overall construction of a support assembly according to an embodiment of the present invention;

FIG. 10 is a schematic view of the overall structure of a clamp according to an embodiment of the present invention;

fig. 11 is a schematic overall structure diagram of an adapter according to an embodiment of the present invention.

In the drawings, the drawings are not necessarily to scale.

Description of the labeling:

1. a testing device;

10. a mechanical grasping assembly; 101. a first linear guide rail; 102. a second linear guide; 103. a third linear guide rail; 104. a clamping member;

20. a liquid storage assembly; 201. fixing the trough body; 201a, a convex column; 202. a groove body can be lifted; 202a, a main trough body; 202b, a lap joint; 203. a lift drive; 204. an outer tank body; 205. sealing the cover; 206. a closure driver;

30. a data processing component; 301. an image pickup unit;

40. a lighting assembly;

50. a carrier assembly; 501. a pole piece bearing plate; 502. an electrolyte absorbing member; 503. a clamping member; 504. a guide rail; 505. a slider;

60. calibrating the component; 60a, calibrating a plane; 601. a substrate; 602. a flexible board;

70. a wiping component; 701. a clamping jaw; 702. a flexible wiping section;

80. a support assembly; 801. a support block; 802. positioning pins; 803. a limit baffle;

90. a clamp; 901. a first buckle plate; 9011. a first substrate; 9012. a first platen; 9012a, a rigid sheet layer; 9012b, a flexible sheet layer; 902. a second buckle plate; 9021. a second substrate; 9022. a second platen; 9023. a middle lining plate; 9023a and a limit groove; 9023b, convex strips; 903. a locking member;

100. a transfer seat; 1001. supporting the top plate; 1002. an accommodating chamber; 1003. a spacing pin;

200. a micro-sampler.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience in describing the invention and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

For better understanding of the present invention, the method for testing the pole piece wetting of the secondary battery according to the embodiment of the present invention is described in detail below with reference to fig. 1.

The secondary battery of the present embodiment includes a case, an electrode assembly, and a cap assembly.

The housing of the present embodiment may have a hexahedral shape or other shapes. The case has an inner space accommodating the electrode assembly and the electrolyte. The housing may be made of a material such as aluminum, aluminum alloy, or plastic.

The electrode assembly of the present embodiment is disposed in the case. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The electrode assembly may have a positive electrode sheet, a negative electrode sheet, and a separator stacked together, wound in a jelly-roll-like shape.

The cap assembly of the present embodiment is hermetically connected to the case to enclose the electrode assembly within the case.

The embodiment of the invention provides a pole piece infiltration testing method of a secondary battery, which comprises the following steps:

(a) sucking a predetermined amount of electrolyte by using a micro sampler;

(b) contacting the micro-sampler with a pole piece to be detected, and absorbing the electrolyte in the capillary tube by a pole piece sample to be detected under the capillary action;

(c) and recording the absorbed amount of the electrolyte in the micro-sampler after a preset time, and calculating the final absorption rate of the pole piece to be detected according to the absorbed amount and the ratio of the preset time.

According to the infiltration testing method provided by the embodiment of the invention, a micro sampler can be used for sucking the electrolyte with a preset amount according to the test requirements. Where a trace is a relatively large amount, the microsampler may draw a small amount of electrolyte. Because the pole piece to be tested absorbs the electrolyte in the micro-sampler through the capillary action, and the micro-sampler can accurately absorb the electrolyte with a preset amount to perform the test work, when the micro-sampler contacts with the pole piece to be tested, the pole piece to be tested can actively absorb the electrolyte in the micro-sampler. The electrode piece to be detected absorbs a certain amount of electrolyte, and the micro-sampler releases the electrolyte with the same volume, so that the electrode piece can completely absorb the electrolyte released by the micro-sampler. Electrolyte in the micro sampler cannot actively flow out, the possibility that the electrolyte is gathered on the surface of the pole piece and cannot be completely absorbed by the pole piece to be tested is reduced, and the test result precision of the pole piece absorption rate is effectively improved. In addition, compared with the prior art in a judgment mode through manual visual inspection, the method can accurately collect the absorbed amount of the electrolyte in the micro-sampler, so that the absorbed amount of the electrolyte in the micro-sampler can be accurately calculated, the calculation error is further reduced, and the precision of the test result is improved.

In one embodiment, the microsampler may be a cylindrical structure with capillary channels or capillary-like channels, so that the microsampler directly draws the electrolyte by capillary action without an external driving unit to provide the liquid suction power. Therefore, on one hand, when the electrolyte is absorbed through the capillary action, the absorption amount can be controlled more accurately; on the other hand, because the pole piece that awaits measuring absorbs electrolyte through self capillary action, and when the micro sampler contacted with the pole piece that awaits measuring, the pole piece that awaits measuring just followed the suction of electrolyte in the micro sampler, when breaking away from the contact, the electrolyte in the micro sampler was no longer flowed to can accurately reflect the pole piece that awaits measuring and absorbed the electrolyte of corresponding volume through the electrolyte absorbed amount in the micro sampler, and then further improved the test result precision, realize the quantitative calculation pole piece that awaits measuring and absorb the absorption rate of electrolyte.

Preferably, the microsampler of this embodiment is a capillary tube. The capillary tube is apt to directly draw up the electrolyte by capillary action. Further preferably, the micro-sampler is a transparent capillary tube, and it is easy to directly observe the change in the liquid level of the electrolyte in the capillary tube from the outside of the capillary tube.

In one embodiment, the microsampler is a capillary tube. The number of the capillaries may be one or two or more. Preferably, the number of capillaries is two or more. Before step (a), further comprising step (e): taking more than two capillaries, and calibrating the relative positions of the capillaries so that the liquid taking ends of the capillaries are mutually flush. Because the pole piece that awaits measuring is in the tiling state usually, can guarantee that the end of getting of each capillary all contacts with the pole piece that awaits measuring when getting the liquid end mutual parallel and level of more than two capillaries. Therefore, on one hand, the pole piece to be tested can absorb the electrolyte in more than two capillaries simultaneously, the situation that the electrolyte cannot be released due to the fact that part of the capillaries in more than two capillaries cannot be in contact with the pole piece to be tested is avoided, and the smooth operation of the infiltration test is ensured; on the other hand, more than two capillaries are used for carrying out the infiltration test, more than two final absorption rates can be obtained simultaneously through one test, so that the test time can be effectively shortened, and the precision of the test result can be improved after the averaging processing of more than two final absorption rates.

In one embodiment, in the step (e), when more than two capillaries are immersed in the electrolyte at the same time, the immersion depth of each capillary in the electrolyte is ensured to be the same, so as to ensure that the volumes of the electrolyte absorbed by each capillary are the same, thereby being beneficial to improving the accuracy of the test result.

The preset time of the embodiment refers to the total time of the electrode piece to be tested for completing the electrolyte absorption work. After a preset time, the micro-sampler is moved away to be separated from the contact state of the pole piece to be detected, so that the pole piece to be detected stops absorbing the electrolyte, and meanwhile, the micro-sampler stops releasing the electrolyte. At this time, the amount of the electrolyte absorbed in the microsampler becomes the final amount of the electrolyte absorbed. And the final absorption rate of the pole piece to be detected can be quantitatively calculated according to the ratio of the absorbed quantity to the preset time.

The pole piece infiltration testing method of the secondary battery of the embodiment of the invention also comprises the following steps (g) before the step (c): the amount of absorbed electrolyte in the microsampler is recorded a plurality of times before the predetermined period of time is reached, and an intermediate absorption rate is calculated from the ratio of the amount of absorbed electrolyte recorded each time to the corresponding time, to obtain a plurality of intermediate absorption rates accordingly. After the test operation is started and before the predetermined time period is reached, the absorbed electrolyte amount in the microsampler is recorded at a plurality of time points to correspondingly obtain the absorbed electrolyte amount in the microsampler. And then, calculating the intermediate absorption rate of the pole piece to be detected according to the ratio of the absorbed amount of each electrolyte to the corresponding time, and accordingly recording for multiple times to correspondingly obtain multiple intermediate absorption rates. Therefore, the mode of obtaining the middle absorption rates of a plurality of middle processes through calculation can be helpful for analyzing the change rule of the absorption rate of the pole piece to be detected in the infiltration test process, so that when different pole pieces to be detected are used for the infiltration test, the difference between different pole pieces to be detected can be compared, and data reference and guidance are provided for the corresponding improvement of the pole piece finished product.

In this embodiment, a step (d) is further included between the step (a) and the step (b): and removing the residual electrolyte on the outer wall of the micro-sampler. Since the micro-sampler can directly absorb the electrolyte only by being immersed in the electrolyte, the electrolyte is inevitably left on the outer wall of the micro-sampler. If the electrolyte remained on the outer wall of the micro-sampler is not removed, on one hand, when the micro-sampler is contacted with the pole piece to be detected, the electrolyte remained on the outer wall of the micro-sampler is absorbed by the pole piece to be detected, thereby influencing the speed of the pole piece to be detected for absorbing the electrolyte in the micro-sampler. The pole piece to be tested absorbs extra electrolyte, so that the absorption rate of the pole piece to be tested for absorbing the electrolyte in the micro sampler becomes slow, the preset time required when the electrolyte in the micro sampler reaches the preset absorbed amount is prolonged, the final absorption rate obtained by calculation is reduced, the precision of the calculation result is influenced, and the error exists in the test result. Therefore, after the electrolyte remained on the outer wall of the micro sampler is removed, the precision of the test result can be effectively improved, so that the more accurate electrolyte absorption rate of the pole piece to be tested is obtained; on the other hand, electrolyte can cover the surface of microsampler, when choosing for use from the outside to the electrolyte of microsampler by the absorbed dose when observing the mode, can receive remaining electrolyte on the outer wall to shelter from, measuring error's the condition appears easily, influences the precision of testing result.

In one embodiment, before the step (a), the method further comprises the step of manufacturing a pole piece to be tested: and cutting out the pole piece to be tested with a preset size from the pole piece finished product, and flatly placing the pole piece to be tested.

In one embodiment, the mechanical grabbing component is used to clamp the micro-sampler in the step (a) to perform the actions of sucking a predetermined amount of electrolyte and contacting with the pole piece to be tested, so that the stability of the micro-sampler is improved, and the compressive stress of the micro-sampler on the pole piece can be accurately controlled. Furthermore, in the step (a), a clamp is used for clamping the micro-sampler in advance, and then the mechanical grabbing component is used for clamping the clamp to drive the micro-sampler to perform actions of absorbing a preset amount of electrolyte and contacting with a pole piece to be detected, so that the working efficiency of grabbing the micro-sampler is improved, and the possibility of damage of the mechanical grabbing component to the micro-sampler is reduced.

In one embodiment, in step (c), the amount of absorption of the electrolyte in the microsampler is observed and recorded using an imaging means. Alternatively, the image pickup means includes a CCD (Charge coupled device) camera.

In one embodiment, step (c) is followed by step (f): get rid of remaining electrolyte in the microsampler, repeat step (a) to step (c) to reuse microsampler absorbs electrolyte, reduce the consumptive material cost, also avoid remaining electrolyte to influence the fluid absorption volume when follow-up repeated absorption electrolyte in the microsampler simultaneously, thereby avoid receiving the inaccurate condition that leads to the test result to appear great error because of follow-up test result of microsampler fluid absorption volume.

For better understanding of the present invention, the pole piece wetting test device 1 of the secondary battery according to the embodiment of the present invention is described in detail below with reference to fig. 2 to 11.

The embodiment of the invention also provides a pole piece infiltration testing device 1 of the secondary battery. The testing device 1 is used for automatically testing the electrolyte absorption rate of the pole piece to be tested.

Referring to fig. 2 and 3, a testing device 1 according to an embodiment of the present invention includes a mechanical grasping assembly 10 for grasping a microsampler 200. The mechanical grasping assembly 10 of the present embodiment includes a drive member and a gripping member 104 connected to the drive member. The driving means of the present embodiment includes a first linear guide 101, a second linear guide 102 perpendicular to the first linear guide 101, and a third linear guide 103 perpendicular to both the first linear guide 101 and the second linear guide 102, so that the holding means 104 can move freely within the three-dimensional coordinate system constructed by the first linear guide 101, the second linear guide 102, and the third linear guide 103, so that the holding means 104 is accurately positioned at a predetermined position and holds the micro-sampler 200 for a corresponding operation. In one example, the gripping member 104 of the present embodiment includes two jaws that can move toward and away from each other and a drive mechanism that drives the jaws to move.

Referring to fig. 4 and 5, the testing device 1 according to the embodiment of the present invention includes a reservoir assembly 20 for holding an electrolyte. The reservoir assembly 20 of this embodiment includes a holding tank for holding electrolyte. The holding member 104 can hold the micro-sampler 200 and move it to the receiving slot, and immerse the liquid-taking end of the micro-sampler 200 in the electrolyte contained in the receiving slot, so that the micro-sampler 200 can take up a predetermined amount of electrolyte. Then, the driving part can drive the clamping part 104 to synchronously drive the micro-sampler 200 to contact with the pole piece to be tested. The pole piece to be tested absorbs the electrolyte in the micro-sampler 200 under the capillary action.

Optionally, the accommodating groove of this embodiment includes a fixed groove 201 and a liftable groove 202 that is in sleeve joint with the fixed groove 201. The liftable groove body 202 is arranged in the fixed groove body 201. The fixed tank 201 is used for containing electrolyte. The liquid storage assembly 20 further comprises a lifting driver 203, and the lifting driver 203 can drive the lifting groove body 202 to lift along the depth direction of the fixed groove body 201. After the micro-sampler 200 continuously sucks the electrolyte from the liftable tank 202, the liquid level of the electrolyte in the liftable tank 202 is lowered. In order to ensure that the liquid level of the electrolyte in the liftable tank body 202 is maintained at the initial predetermined height, after the micro-sampler 200 finishes the electrolyte sucking work, the liftable tank body 202 is driven to descend by the lifting driver 203 to be immersed in the electrolyte contained in the fixed tank body 201. After the liftable tank body 202 descends, the electrolyte in the fixed tank body 201 flows into the liftable tank body 202 to compensate the electrolyte absorbed by the micro-sampler 200 in the liftable tank body 202, so that the liquid level in the liftable tank body 202 rises to the initial liquid level. Then, the liftable tank 202 is lifted again to wait for the next microsampler to absorb the electrolyte. Like this, the liquid level height of the electrolyte in the liftable cell body 202 can be kept at the initial predetermined height all the time to microsampler 200 keeps under the condition that the relative position with liftable cell body 202 does not change, and the degree of depth that microsampler 200 submerges in electrolyte does not change, is favorable to improving the uniformity that microsampler 200 absorbs the absorption capacity of electrolyte at every turn, effectively improves the precision of test result.

The fixing groove 201 of the present embodiment includes a convex pillar 201a disposed on the end surface of the notch. An operator can grasp the protruding column 201a by an external tool (e.g., tweezers) to quickly pick and place the fixing slot 201. The liftable tank 202 includes a main tank 202a and an overlapping portion 202b provided on a notch end of the main tank 202 a. A part of the overlapping portion 202b is bent and extends above the notch end face of the fixed tank body 201, so that in the depth direction of the fixed tank body 201, the overlapping portion 202b partially shields the notch end face of the fixed tank body 201. The stud 201a is disposed adjacent to the bridge 202 b. The elevating driver 203 is connected with the overlapping portion 202b so that the elevating driver 203 drives the main tank 202a located in the fixed tank 201 to ascend and descend from the outside of the fixed tank 201, thereby preventing the elevating driver 203 from interfering with the fixed tank 201. Alternatively, the lifting drive 203 may be a hydraulic telescopic cylinder, a pneumatic telescopic cylinder, an electric telescopic cylinder, or the like. The fixed tank body 201 and the liftable tank body 202 are both made of plastics, so that the situation that the purity of the electrolyte is not qualified due to corrosion of the electrolyte on the fixed tank body 201 or the liftable tank body 202 is avoided, and the accuracy of the absorption rate test result of the pole piece to be tested on the electrolyte is influenced.

The receiving tank of this embodiment further includes an outer tank 204. The fixed tank body 201 is arranged in the outer tank body 204, so that the outer tank body 204 can protect the fixed tank body 201, and the possibility that the fixed tank body 201 is collided by an external object to cause the overflow of the electrolyte is reduced. An operator can grasp the convex column 201a by an external tool (such as tweezers) to quickly take and place the fixing groove body 201 from the outer groove body 204. Optionally, the outer tank 204 is made of a metallic material.

The reservoir assembly 20 of this embodiment further includes a cap 205 and a cap driver 206. The cap 205 is connected to the output of the cap driver 206. The cover 205 is used to close or open the opening of the outer tank 204. The cover driver 206 can drive the cover 205 to rotate to cover or open the opening of the outer slot 204 to shield or expose the fixed slot 201 in the outer slot 204. When the micro-sampler 200 needs to draw up electrolyte, the cover 205 is in an open state. After the micro sampler 200 finishes absorbing the electrolyte and moves away or the immersion test is finished, the sealing cover 205 is in a closed state, so that the volatilization amount of the electrolyte in the fixed tank body 201 can be reduced, and impurities such as external dust can be prevented from flying into the electrolyte to reduce the purity of the electrolyte, so that the absorption rate test result precision of the pole piece to be tested on the electrolyte is adversely affected. In one example, the lid driver 206 is capable of driving the lid 205 in an elevating motion and a rotating motion. The lid driver 206 can drive the lid 205 to rotate to move the lid 205 over the opening of the outer tank 204 or away from the opening of the outer tank 204. When the lid 205 is moved over the opening of the outer tank 204, the lid driver 206 can drive the lid 205 down to close the opening of the outer tank 204 or drive the lid 205 up to open the opening of the outer tank 204. Optionally, the closure actuator 206 is an air cylinder, an electric cylinder, or a hydraulic cylinder. In another example, the lid driver 206 can drive the lid 205 in a rotational motion. The lid driver 206 can drive the lid 205 to rotate to move the lid 205 over or away from the opening of the outer tank 204 to close or open the opening of the outer tank 204. Optionally, the closure driver 206 is a stepper motor or a servo motor.

Referring to fig. 2, the testing device 1 of the embodiment of the present invention further includes a data processing component 30 for collecting and processing data. The data processing assembly 30 may record the absorbed amount of electrolyte in the microsampler 200 over a predetermined period of time and calculate the final absorption rate of the pole piece to be measured based on the ratio of the absorbed amount to the predetermined period of time. The data processing assembly 30 can automatically collect the preset amount, absorbed amount and preset time of the electrolyte in the micro-sampler 200 and automatically calculate through the collected data, so that manual reading recording and calculation are not needed, errors caused by manual operation are effectively avoided, and the calculation analysis work efficiency and calculation precision are improved.

In one embodiment, the data processing assembly 30 includes an image capture component 301. The image pickup part 301 is used for acquiring the absorbed amount of the electrolyte in the micro-sampler 200 contacting with the pole piece to be measured in real time. In one example, the image capture component 301 includes a lift base and a camera. The height of the camera can be flexibly adjusted through the lifting base. Alternatively, the video camera is a CCD camera, and here, the CCD is an abbreviation of a Charge Coupled Device (Charge Coupled Device).

In one embodiment, the testing device 1 includes an illumination assembly 40. The lighting assembly 40 is used for providing lighting for the micro-sampler 200 and the area where the pole piece to be tested is placed, so that the camera part 301 can accurately collect the absorbed amount of the electrolyte in the micro-sampler 200 which is in contact with the pole piece to be tested, and meanwhile, the observation of the test process by an operator is facilitated. In one example, the lighting assembly 40 includes a lifting bracket and a light source disposed on the lifting bracket. The height of the light source can be flexibly adjusted through the lifting support.

Referring to fig. 6, the test device 1 according to the embodiment of the present invention further includes a carrier assembly 50. The carrier assembly 50 comprises a pole piece supporting plate 501 for supporting a pole piece to be tested and an electrolyte absorption part 502. The pole piece supporting plate 501 is used for supporting a pole piece to be tested. The pole piece support plate 501 has a plane with flatness meeting predetermined requirements. The pole piece that awaits measuring can guarantee self roughness when placing in above-mentioned plane, the difficult wrinkle or local uplift condition that appears effectively guarantees that micro sampler 200 is good with the pole piece contact state that awaits measuring, and micro sampler 200 acts on the compressive stress equilibrium on the pole piece that awaits measuring, is favorable to the pole piece that awaits measuring fully to absorb the electrolyte in micro sampler 200, reduces because the contact between micro sampler 200 and the pole piece that awaits measuring is inseparable and leads to the pole piece that awaits measuring to normally absorb the possibility of the electrolyte in micro sampler 200, improves the test result precision.

The electrolyte absorption member 502 of this embodiment can be used to absorb the electrolyte remaining in the microsampler 200 after the immersion test is completed, so that the same microsampler 200 can be reused to re-absorb a predetermined amount of electrolyte for further testing. Therefore, on one hand, the micro sampler 200 does not need to be replaced after the test is finished every time, and the working efficiency is improved; on the other hand, the influence of the residual electrolyte in the micro sampler 200 on the purity of the subsequently absorbed electrolyte or on the absorption capacity of the subsequently absorbed electrolyte is avoided, and the improvement of the precision of the test result is facilitated. In one example, a recess is provided on the pole piece support plate 501. The electrolyte absorbing member 502 is disposed in the concave portion. Alternatively, the electrolyte absorbing member 502 is a flexible absorbing member such as a sponge or a cotton sheet.

The carrier assembly 50 of this embodiment also includes a clamping member 503 for use with the pole piece support plate 501. The clamping component 503 can clamp the pole piece to be tested together with the pole piece supporting plate 501 to fix the pole piece to be tested, so as to prevent the position of the pole piece to be tested from moving and/or wrinkling. Therefore, on one hand, the pole piece to be tested is prevented from falling off from the pole piece bearing plate 501 to influence the test process; on the other hand, the situation that the contact area of the subsequent micro-sampler 200 and the pole piece to be tested and the contact area of the previous micro-sampler 200 and the pole piece to be tested are the same area due to the fact that the position of the pole piece to be tested moves is avoided, so that the situation that the absorption capacity of the pole piece to be tested on the electrolyte in the subsequent micro-sampler 200 is reduced or cannot be absorbed occurs, errors occur in the measurement result, and the precision of the measurement result is influenced; on the other hand, when the pole piece to be tested has a wrinkle, the contact state between the micro sampler 200 and the wrinkle area is not good enough, a part of the wrinkle area where the pole piece to be tested has a contact with the micro sampler 200, and the rest of the wrinkle area has no contact with the micro sampler 200, so that the absorption rate of the pole piece to be tested for absorbing the electrolyte is affected. In one example, the clamping member 503 includes a bead and a latch. The locking piece can enable the pressing strip to be switched between the pressing position and the opening position.

The carrier assembly 50 of this embodiment also includes a guide rail 504. The guide 504 includes a base and a slider 505 disposed on the base. The pole piece support plate 501 is disposed on the slider 505. Adjusting the position of slider 505 along guide 504 allows for the simultaneous adjustment of the position of pole piece support plate 501 to quickly and accurately adjust pole piece support plate 501 to a predetermined position. The carrier assembly 50 of this embodiment also includes a power unit. The power unit is used for automatically driving the sliding block 505 to move on the guide rail 504. Alternatively, the power unit is an electric telescopic cylinder, a pneumatic telescopic cylinder, a hydraulic telescopic cylinder or the like.

Referring to FIG. 7, the testing device 1 of the present embodiment further includes a calibration assembly 60. the calibration assembly 60 has a calibration plane 60a, and the calibration plane 60a is used for calibrating the liquid-extracting end of the micro-sampler 200 held by the holding member 104. The number of microsamplers 200 may be two or more. The access ends of two or more microsamplers 200 are calibrated by contact with the calibration flat 60 a. After the calibration is completed, the liquid-extracting ends of the two or more microsamplers 200 are flush with each other. Like this, because the pole piece that awaits measuring is in the tiling state usually, can guarantee that the end of getting of each micro sampler 200 all contacts with the pole piece that awaits measuring when the end of getting of two above micro sampler 200 is parallel and level each other. Therefore, on one hand, the pole piece to be tested can absorb the electrolyte in more than two microsamplers 200 at the same time, the situation that the electrolyte cannot be released because part of the microsamplers 200 in more than two microsamplers 200 cannot be in contact with the pole piece to be tested is avoided, and the smooth operation of the infiltration test is ensured; on the other hand, the more than two microsamplers 200 are used for carrying out the infiltration test, more than two final absorption rates can be obtained simultaneously through one test, so that the test time can be effectively shortened, and the precision of the test result can be improved after the more than two final absorption rates are averaged; on the other hand, when the two or more microsamplers 200 are immersed in the electrolyte, the depth of the liquid-taking end of each microsampler 200 immersed in the electrolyte can be ensured to be the same, so that the volume of the electrolyte absorbed by each microsampler 200 is ensured to be the same, and the accuracy of the test result is improved.

The calibration assembly 60 of the present embodiment includes a base 601 and a flexible board 602 disposed on the base 601. The surface of the flexible plate 602 facing away from the substrate 601 forms the alignment plane 60 a. Optionally, the flexible plate 602 is made of plastic or rubber. During calibration of the micro-sampler 200, the fluid-withdrawal end of the micro-sampler 200 may exert a compressive stress on the flexible plate 602. The flexible plate 602 itself may form a buffer protection for the liquid-extracting end of the micro-sampler 200, thereby avoiding the liquid-extracting end of the micro-sampler 200 from being cracked or bent under the reaction force of the compressive stress.

Referring to fig. 8, the testing device 1 of the present embodiment further includes a wiping member 70, and the wiping member 70 is used to wipe the outer wall of the microsampler 200 to remove the electrolyte attached to the outer wall. The wiping assembly 70 comprises two jaws 701 and a flexible wiping portion 702 provided on each jaw 701. Since the micro-sampler 200 needs to be immersed in the electrolyte to be able to directly suck the electrolyte, the electrolyte inevitably remains on the outer wall of the micro-sampler 200. If the electrolyte remaining on the outer wall of the micro-sampler 200 is not removed, on the one hand, when the micro-sampler 200 is in contact with the pole piece to be tested, the electrolyte remaining on the outer wall of the micro-sampler 200 is absorbed by the pole piece to be tested, thereby affecting the speed of the pole piece to be tested absorbing the electrolyte in the micro-sampler 200. Because the pole piece to be tested absorbs extra electrolyte, the absorption rate of the pole piece to be tested for absorbing the electrolyte in the micro sampler 200 becomes slow, so that the preset time required when the electrolyte in the micro sampler 200 reaches the preset absorbed amount is prolonged, the calculated absorption rate is reduced, the precision of the calculation result is influenced, and the error exists in the test result. Therefore, after the electrolyte remaining on the outer wall of the micro sampler 200 is removed, the precision of the test result can be effectively improved, so as to obtain more accurate electrolyte absorption rate of the pole piece to be tested; on the other hand, the electrolyte covers the outer surface of the micro-sampler 200, and when the amount of absorbed electrolyte in the micro-sampler 200 is observed from the outside of the imaging unit 301, the electrolyte may be blocked, which may cause measurement errors, and may affect the accuracy of the test result.

When the electrolyte on the outer wall of the micro-sampler 200 is wiped, the flexible wiping portion 702 does not scratch or damage the micro-sampler 200, and the structural integrity of the micro-sampler 200 is effectively ensured. In one example, the flexible wipe 702 can be made of sponge, cotton fabric, or cotton sheet, among others.

Referring to fig. 9, the testing device 1 of the present embodiment further includes a support assembly 80 for holding a microsampler 200. The support assembly 80 includes a plurality of support blocks 801 spaced side-by-side. The top of the support block 801 holds the microsampler 200. A groove is formed between two adjacent support blocks 801. The groove is used for placing a fixture for holding the microsampler 200. An operator may place the jig in the groove in advance, then stack the micro-sampler 200 onto the supporting assembly 80, and then hold the micro-sampler 200 by the jig, or the operator may stack the micro-sampler 200 onto the supporting assembly 80 in advance, then insert one jaw of the holding part 104 into the groove, and the other jaw is above the micro-sampler 200, and then close the two jaws to directly hold the micro-sampler 200.

The support assembly 80 of this embodiment also includes a limit stop 803 provided on the outermost support block 801. When a plurality of microsamplers 200 are placed on supporting block 801 simultaneously, one end of a plurality of microsamplers 200 can be abutted against limiting baffle 803, so that an operator can conveniently align the liquid suction ends of a plurality of microsamplers 200 close to limiting baffle 803.

The bearing assembly 80 of the present embodiment also includes a locating pin 802. A positioning pin 802 is provided between two adjacent support blocks 801. The positioning pin 802 can facilitate positioning of the fixture for holding the micro-sampler 200, which is advantageous for the fixture to be quickly and precisely placed in a predetermined position, so that the fixture can accurately and stably hold and pick up the micro-sampler 200.

Referring to fig. 10, the testing device 1 of the present embodiment further includes a holder 90 for holding the microsampler 200. The holding member 104 can hold the microsampler 200 by the holder 90. The holder 90 protects the micro-sampler 200 and reduces the possibility that the holding member 104 directly holds the micro-sampler 200 and damages or damages the micro-sampler 200. The clamp 90 of the embodiment comprises a first pinch plate 901 and a second pinch plate 902. First and

second clips

901 and 902 snap into each other to grip the microsampler 200 and apply a predetermined pressure to the microsampler 200. The clamp 90 of this embodiment further comprises a locking member 903. One end of the first buckle plate 901 is pivoted with the second buckle plate 902, and the other end is locked or separated with the second buckle plate 902 through a locking part 903.

The first buckle 901 of this embodiment includes a first base plate 9011 and a first press plate 9012 detachably connected to the first base plate 9011, so that the first press plate 9012 can be replaced conveniently. The first hold down 9012 is used to press the microsampler 200 against the second pinch plate 902. In one example, the first substrate 9011 is made of a metal material, such as steel, aluminum, or an aluminum alloy. The first press plate 9012 includes a rigid sheet 9012a and a flexible sheet 9012b that are stacked on top of each other. The flexible sheet 9012b is used to press the microsampler 200 against the second pinch plate 902. When the fixture 90 is used for clamping the micro-sampler 200, the flexible sheet layer 9012b cannot scratch or damage the micro-sampler 200, and the structural integrity of the micro-sampler 200 is effectively guaranteed. In addition, the flexible sheet 9012b does not apply excessive compressive stress to the microsampler 200, so that the microsampler 200 is easy to move relative to the flexible sheet 9012b when the microsampler 200 is calibrated, and the liquid taking end of the microsampler 200 is not easy to crack or deform during the calibration process. Optionally, the rigid sheet 9012a is made of plastic or rubber. The flexible sheet layer 9012b is made of sponge, cotton fabric or cotton sheets.

The second buckle 902 of this embodiment includes a second base plate 9021, a second press plate 9022 detachably connected to the second base plate 9021, and a middle liner 9023 disposed between the second base plate 9021 and the second press plate 9022. The intermediate liner 9023 is used to compress the microsampler 200 against the first gusset 901. In one example, the second substrate 9021 is made of a metal material, such as steel, aluminum, or an aluminum alloy. The second press plate 9022 is a flexible plate structure, and may be made of plastic or rubber. The intermediate liner 9023 is made of a metal material, such as steel, aluminum, or an aluminum alloy.

The middle lining plate 9023 of this embodiment is provided with a limiting groove 9023a, the limiting groove 9023a is used for accommodating the micro-sampler 200 to limit the micro-sampler 200, and the portion of the first buckle plate 901 corresponding to the limiting groove 9023a and the surface of the middle lining plate 9023 on which the limiting groove 9023a is formed clamp the micro-sampler 200 together. The micro-sampler 200 is limited by the limiting groove 9023a, and the position of the micro-sampler is kept stable and is not easy to move in the testing process. Optionally, the shape of the limiting groove 9023a is a V shape or a Y shape. In one example, the middle liner 9023 has two spaced-apart ribs 9023 b. The first buckle 901 and the convex strip 9023b are used together for clamping the micro-sampler 200. The second press plate 9022 is disposed between the two protruding strips 9023 b. The top end of the raised line 9023b is provided with a limiting groove 9023 a.

Referring to fig. 11, the testing device 1 according to the embodiment of the present invention further includes an adapter 100 for adapting the jig 90. The adapter 100 includes a top support plate 1001 and a receiving cavity 1002 formed in the top support plate 1001. The jig 90 can be held by the holding top plate 1001, and a part of the micro sampler 200 held by the jig can be inserted into the housing cavity 1002 through the opening. In one example, the adapter 100 further includes three side plates connected in series and disposed on the top support plate 1001, and a bottom plate disposed opposite to the top support plate 1001. Three side plates connected in series form a portion of the receiving cavity 1002 for receiving a portion of the microsampler 200. Optionally, the edge of the top support plate 1001 of this embodiment is provided with a notch, which is a concave structure as a whole and forms the above-mentioned opening. Alternatively, the top support plate 1001 of the present embodiment is provided with a through hole, which is formed as an opening as described above, and has an annular structure as a whole. The fixture 90 with the micro-sampler 200 mounted thereon can be temporarily placed on the adapter 100 to facilitate gripping and removal of the fixture 90 from the adapter 100 directly by the gripping members 104 included in the mechanical grasping assembly 10 for subsequent testing.

The adaptor 100 of the present embodiment includes a stopper pin 1003 provided on the holding top plate 1001. The limiting pin 1003 is used for limiting the relative position of the fixture 90 and the adapter 100, so that the fixture 90 can be conveniently and quickly and accurately placed at a preset position, and damage or deformation caused by collision between the micro sampler 200 clamped by the fixture 90 and the adapter 100 in the placing process is avoided. In one example, a restraint pin 1003 is provided on the top surface of the racking board 1001. The number of the spacing pins 1003 is two.

In one embodiment, the micro-sampler 200 may be a cylindrical structure with capillary channels or capillary-like channels, such that the micro-sampler 200 can directly draw the electrolyte by capillary action without an external driving unit to provide the liquid suction power. Thus, on the one hand, when the micro-sampler 200 sucks up the electrolyte by capillary action, the sucking amount can be controlled more accurately; on the other hand, because the pole piece absorbs the electrolyte through the capillary action of the pole piece, and when the micro sampler 200 is contacted with the pole piece to be tested, the pole piece to be tested sucks out the electrolyte in the micro sampler 200, so that the absorbed amount of the electrolyte in the micro sampler 200 can accurately reflect that the pole piece to be tested absorbs the electrolyte with the corresponding volume, the test result precision is further improved, and the absorption rate of the pole piece to be tested for absorbing the electrolyte is quantitatively calculated.

In another embodiment, the microsampler 200 is a capillary tube. The capillary tube is apt to directly draw up the electrolyte by capillary action. Further preferably, the micro-sampler 200 is a transparent capillary tube, and it is easy to directly observe the change in the liquid level of the electrolyte in the capillary tube from the outside of the capillary tube.

In one embodiment, the test run procedure comprises the following procedures:

placing a predetermined number of microsamplers 200 on the support assembly 80, holding all microsamplers 200 with the fixture 90, and then transferring the fixture 90 to the adapter 100 for use; alternatively, clamp 90 is placed in a recess of support assembly 80 in advance, sampler 200 is placed on support assembly 80, and clamp 90 is then transferred to adapter 100 for use;

the predetermined number of microsamplers 200 are again placed on the support assembly 80 for use;

starting a camera shooting component and an illuminating assembly;

starting the mechanical grabbing assembly 10 to grab the fixture 90 on the adapter 100;

the mechanical grabbing assembly 10 carries the microsamplers 200 to move above the calibration assembly 60, and the heights of the liquid taking ends of the microsamplers 200 are calibrated through the calibration plane 60 a;

after the calibration operation is completed, the mechanical grasping assembly 10 carries the micro-sampler 200 to move to the position above the accommodating tank of the liquid storage assembly 20, and the liquid taking end of the micro-sampler 200 is immersed in the electrolyte in the accommodating tank until the micro-sampler 200 absorbs a predetermined amount of electrolyte;

after the electrolyte sucking work is completed, the mechanical grasping assembly 10 carries the micro-sampler 200 to move to the wiping assembly 70, so as to remove the electrolyte remaining on the outer wall of the micro-sampler 200 through the wiping assembly 70;

after the wiping operation is completed, the mechanical grabbing assembly 10 carries the micro-sampler 200 to move to the position above the pole piece to be tested clamped on the carrying assembly 50, then the micro-sampler 200 is contacted with the pole piece to be tested, and the soaking operation is completed after a preset time period, so that the micro-sampler 200 is separated from the pole piece to be tested; the image pickup part 301 collects the amount of absorbed electrolyte in the micro-sampler 200;

the mechanical grasping assembly 10 carries the microsampler 200 to move over the electrolyte absorption member 502 and into contact with the electrolyte absorption member 502 to absorb the electrolyte remaining in the microsampler 200 through the electrolyte absorption member 502, and the test is completed.

According to the pole piece infiltration testing device 1 of the secondary battery, the mechanical grabbing component 10 is used for clamping and moving the micro-sampler 200, a preset amount of electrolyte can be automatically absorbed from the accommodating groove of the liquid storage component 20, and then the micro-sampler 200 is contacted with a pole piece to be tested to conduct infiltration testing. The data processing assembly 30 is capable of automatically collecting the amount of electrolyte absorbed and the predetermined length of time within the microsampler 200 and automatically calculating the final absorption rate based on the collected data. The data processing assembly 30 may also be capable of automatically collecting the absorbed volume of electrolyte within the microsampler 200 at any time prior to reaching the predetermined time period. The pole piece infiltration testing device 1 of the secondary battery can realize the automation of operations such as liquid taking, infiltration and data recording in a test, can improve the testing work efficiency of the absorption rate of electrolyte of a pole piece to be tested, can avoid the adverse effect on a test result caused by artificial subjective judgment or data recording, is favorable for reducing the error of the test result, and increases the precision of the test result.

While the invention has been described with reference to a preferred embodiment, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and particularly, features shown in the various embodiments may be combined in any suitable manner without departing from the scope of the invention. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A pole piece infiltration test method of a secondary battery is characterized by comprising the following steps:

(a) sucking a predetermined amount of electrolyte by using a micro sampler;

(b) contacting the micro-sampler with a pole piece to be detected, and absorbing the electrolyte in the micro-sampler by the pole piece to be detected under the capillary action;

2. The pole piece infiltration testing method of the secondary battery according to claim 1, wherein in the step (a), the micro-sampler is a device for absorbing the electrolyte by capillary action.

3. The pole piece infiltration testing method of the secondary battery according to claim 1, characterized in that, a step (d) is further included between the step (a) and the step (b): and removing the residual electrolyte on the outer wall of the micro-sampler.

4. The pole piece wetting test method of the secondary battery according to any one of claims 1 to 3, wherein in the step (a), the micro-sampler is a capillary tube.

5. The pole piece infiltration testing method of the secondary battery according to claim 4, characterized in that, the method further comprises a step (e) before the step (a): taking more than two capillaries, and calibrating the relative positions of the capillaries so as to enable the liquid taking ends of the capillaries to be level with each other.

6. The pole piece wetting test method of the secondary battery according to claim 5, wherein in the step (e), the volumes of the electrolytes sucked by the two or more capillaries are the same.

7. The pole piece infiltration testing method of the secondary battery according to any one of claims 1 to 3, characterized in that, after the step (c), the method further comprises a step (f): removing the electrolyte remaining in the microsampler and repeating steps (a) through (c).

8. The pole piece infiltration testing method of the secondary battery according to claim 1, characterized in that step (c) is preceded by step (g): the amount of absorbed electrolyte in the microsampler is recorded a plurality of times before the predetermined period of time is reached, and an intermediate absorption rate is calculated from the ratio of the amount of absorbed electrolyte recorded each time to the corresponding time, to obtain a plurality of said intermediate absorption rates accordingly.

9. The utility model provides a secondary cell's pole piece infiltration testing arrangement which characterized in that includes:

the mechanical grabbing assembly comprises a driving part and a clamping part connected with the driving part;

the driving part can drive the clamping part to clamp the micro sampler, drive the clamping part to insert the micro sampler into the accommodating groove to absorb a predetermined amount of electrolyte, and then contact the micro sampler with a pole piece to be tested to perform an electrolyte infiltration test;

and the data processing component is used for recording the absorbed amount of the electrolyte in the micro sampler after a preset time period and calculating the final absorption rate of the pole piece to be detected according to the absorbed amount and the ratio of the preset time period.

10. The pole piece infiltration testing device of the secondary battery as claimed in claim 9, wherein the holding tank comprises a fixed tank body and a liftable tank body sleeved with the fixed tank body, the liftable tank body is arranged in the fixed tank body, the fixed tank body is used for holding electrolyte, the liquid storage assembly further comprises a lifting driver, and the lifting driver can drive the liftable tank body to lift along the depth direction of the fixed tank body.

11. The pole piece infiltration testing device of the secondary battery as claimed in claim 10, wherein the fixed slot body comprises a convex column arranged on the end face of the notch of the fixed slot body, the liftable slot body comprises a main slot body and an overlapping part arranged on the end face of the notch of the main slot body, a part of the overlapping part is bent and extends to the upper part of the end face of the notch of the fixed slot body, and the lifting driver is connected with the overlapping part.

12. The pole piece infiltration testing device of the secondary battery as claimed in claim 10 or 11, wherein the holding tank further comprises an outer tank body, and the fixing tank body is arranged in the outer tank body.

13. The pole piece infiltration testing device of the secondary battery as claimed in claim 12, wherein the liquid storage assembly further comprises a sealing cover and a sealing cover driver, the sealing cover is connected with an output end of the sealing cover driver, the sealing cover is used for covering or opening the opening of the outer slot body, and the sealing cover driver can drive the sealing cover to rotate so as to cover or open the opening of the outer slot body.

14. The pole piece infiltration testing device of the secondary battery according to any one of claims 9 to 11, characterized in that, the pole piece infiltration testing device of the secondary battery further comprises a carrying component, the carrying component comprises a pole piece supporting plate and an electrolyte absorption component, the pole piece supporting plate is used for supporting the pole piece to be tested, and the electrolyte absorption component can be used for absorbing the electrolyte remained in the micro sampler after the infiltration test is completed.

15. The pole piece wetting test device of the secondary battery according to claim 14, characterized in that:

the carrying assembly also comprises a clamping component matched with the pole piece bearing plate for use, and the clamping component and the pole piece bearing plate can jointly clamp the pole piece to be tested; and/or

The object carrying assembly further comprises a guide rail, the guide rail comprises a base and a sliding block arranged on the base, and the pole piece bearing plate is arranged on the sliding block.

16. The pole piece wetting test device of the secondary battery according to any one of claims 9 to 11, further comprising a calibration assembly having a calibration plane for calibrating the micro-sampler held by the holding member.

17. The pole piece wetting test device of the secondary battery of claim 16, wherein the calibration assembly comprises a base and a flexible plate disposed on the base, and a surface of the flexible plate facing away from the base forms the calibration plane.

18. The pole piece infiltration testing device of the secondary battery of any one of claims 9 to 11, characterized in that, the pole piece infiltration testing device of the secondary battery further comprises a wiping component, the wiping component is used for wiping the outer wall of the micro sampler to remove the electrolyte attached to the outer wall; the wiping component comprises two clamping jaws and a flexible wiping part arranged on each clamping jaw.

19. The pole piece infiltration testing device of the secondary battery of any one of claims 9 to 11, further comprising a supporting assembly for supporting the micro-sampler, wherein the supporting assembly comprises a plurality of supporting blocks arranged side by side at intervals, and the top ends of the supporting blocks are used for supporting the micro-sampler.

20. The pole piece infiltration testing device of the secondary battery of any one of claims 9 to 11, further comprising a clamp for clamping the micro-sampler, wherein the clamping component can clamp the micro-sampler through the clamp, and the clamp comprises a first buckle plate and a second buckle plate, the first buckle plate and the second buckle plate are buckled with each other to clamp the micro-sampler and apply a predetermined pressure to the micro-sampler.

21. The pole piece infiltration testing device of the secondary battery of claim 20, wherein the clamp further comprises a locking member, one end of the first buckle plate is pivotally connected with the second buckle plate, and the other end of the first buckle plate is locked or separated with the second buckle plate through the locking member.

22. The pole piece infiltration testing device of the secondary battery of claim 20, wherein the first pinch plate comprises a first substrate and a first pressing plate detachably connected with the first substrate, and the first pressing plate is used for pressing the micro-sampler with the second pinch plate.

23. The pole piece infiltration testing device of the secondary battery of claim 22, wherein the first pressing plate comprises a rigid sheet and a flexible sheet stacked on each other, and the flexible sheet is used for pressing the micro-sampler with the second buckle plate.

24. The pole piece infiltration testing device of the secondary battery of claim 20, wherein the second pinch plate comprises a second substrate, a second pressing plate detachably connected with the second substrate, and an intermediate lining plate arranged between the second substrate and the second pressing plate, and the intermediate lining plate is used for pressing the micro sampler with the first pinch plate.

25. The pole piece infiltration testing device of the secondary battery of claim 24, wherein the middle lining board is provided with a limiting groove for accommodating the micro-sampler to limit the micro-sampler, and the portion of the first buckle plate corresponding to the limiting groove and the surface of the middle lining board forming the limiting groove clamp the micro-sampler together.

26. The pole piece infiltration testing device of the secondary battery according to claim 20, further comprising an adapter for adapting the fixture, wherein the adapter comprises a supporting top plate and an opening disposed in the accommodating cavity of the supporting top plate, and the fixture can be supported by the supporting top plate and a part of the micro sampler clamped therein can extend into the accommodating cavity through the opening.

27. The pole piece wetting test device for the secondary battery according to any one of claims 9 to 11, characterized in that:

the data processing assembly comprises a camera shooting component, and the camera shooting component is used for collecting the absorbed amount of the electrolyte in the micro-sampler, which is in contact with the pole piece to be detected, in real time; and/or the presence of a gas in the gas,

the pole piece infiltration testing device of the secondary battery further comprises an illuminating assembly, and the illuminating assembly is used for providing illumination for the micro sampler.