Lithium battery slurry detection device and detection method

Abstract

The application provides a lithium battery slurry detection device and a detection method. Through cooperation of a material containing part, a stamping part, a current collector and a base, the amount of material adhered per unit effective area is detected to obtain material adhered value data. Based on the data, control of the consistency of the current collector adhered per unit area is realized.

Description

Technical Field

[0001] This invention relates to the field of lithium battery slurry testing equipment, and more specifically, to a lithium battery slurry testing device and testing method. Background Technology

[0002] Lithium batteries are widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, uninterruptible power supplies for postal and telecommunications, as well as in many fields such as power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0003] The control of lithium battery slurry process plays a crucial role in the performance of the manufactured battery. Insufficient viscosity consistency of lithium battery slurry will lead to poor quality of lithium battery electrode coating process and affect battery performance. Summary of the Invention

[0004] The main objective of this invention is to provide a lithium battery slurry testing device and method to solve the problem of inaccurate detection of the viscosity of lithium battery slurry in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a lithium battery slurry testing device is provided, comprising: a material holding section having a receiving cavity inside for holding battery slurry; an imprinting section having a mounting surface at its bottom; a current collector detachably mounted on the mounting surface; and a base having a positioning cavity at its upper end, a sampling hole on the bottom wall of the positioning cavity, wherein the imprinting section is detachably mounted in the positioning cavity to form a sampling assembly together with the base, the sampling assembly being placed in the material holding section, and the battery slurry being able to adhere to the current collector through the sampling hole.

[0006] Furthermore, the outer wall of the base is adapted to the inner wall of the material holding part, and a merging cavity is provided at the lower end of the base. The merging cavity and the positioning cavity are connected through a sampling hole.

[0007] Furthermore, the sampling hole is a circular hole, and the top wall of the manifold is provided with an annular conical surface that is inclined toward the center of the sampling hole, and the annular conical surface is coaxial with the sampling hole.

[0008] Furthermore, the base is provided with a flow guiding channel, the first end of which forms a first opening on the annular conical surface, and the second end of which forms a second opening on the lower end surface of the base.

[0009] Furthermore, the flow guiding channel includes a first inlet section and a second inlet section, the first inlet section is connected to the second inlet section, the first inlet section is connected to the second opening, and the second inlet section is connected to the first opening.

[0010] Furthermore, there are multiple flow channels, which are spaced apart circumferentially along the base, and the multiple first openings all face the center of the sampling hole.

[0011] Furthermore, the first inlet section is a through hole and extends along the height direction of the base to form a third opening on the upper surface of the base. Both the second and third openings are elongated holes.

[0012] Furthermore, the imprinting part includes a sampling part and a handheld part connected to the sampling part. The outer side wall of the sampling part is adapted to the inner side wall of the positioning cavity. The upper end of the handheld part is provided with a flat surface to facilitate the imprinting part being placed upside down.

[0013] Furthermore, the bottom of the imprinting part is provided with an annular boss, the interior of which forms a mounting cavity, and the mounting surface is formed on the top of the mounting cavity, with the current collector matching the mounting cavity; the bottom wall of the positioning cavity is provided with an annular clearance groove, which is used to make way for the annular boss; and a handle is provided on the upper part of the base.

[0014] According to another aspect of the present invention, a method for detecting lithium battery slurry is provided. The method uses the aforementioned lithium battery slurry detection device. The method includes: mounting a current collector on a mounting surface and weighing the current collector and the imprinting part together to obtain an initial weight a; inserting the imprinting part into a positioning cavity so that the imprinting part and the base form a sampling assembly; placing the sampling assembly into a material holding part so that battery slurry adheres to the position of the current collector corresponding to the sampling hole; vertically lifting the imprinting part, tilting and flipping it to a predetermined angle, weighing the current collector and the imprinting part with the adhered battery slurry to obtain a detection weight b; and calculating the adhesion value c = ba.

[0015] Furthermore, the base is a first base, and the sampling hole radius of the first base is R. After calculating the first adhesive value c = ba, the method also includes: calculating the first adhesive surface density d = c / πR. 2 .

[0016] Furthermore, the lithium battery slurry testing device also includes n second bases in addition to the first base. The sampling holes of the second bases have different radii than those of the sampling holes of the first base. After calculating the first adhesive surface density, the method further includes: repeatedly performing the above-described lithium battery slurry testing method to obtain n second adhesive values ​​corresponding to the n second bases; calculating the n second adhesive surface densities; and calculating the average adhesive surface density based on the first adhesive surface density and the n second adhesive surface densities.

[0017] Applying the technical solution of this invention, the lithium battery slurry detection device of this invention involves installing the current collector on the mounting surface and weighing both the current collector and the imprinting part together to obtain an initial weight 'a'; inserting the imprinting part into the positioning cavity so that the imprinting part and the base form a sampling assembly; placing the sampling assembly into the material holding part so that battery slurry adheres to the position of the current collector corresponding to the sampling hole; vertically lifting the imprinting part, tilting and flipping it to a predetermined angle, and weighing the current collector and the imprinting part with the adhered battery slurry to obtain a detection weight 'b'; and calculating the adhesion value 'c' = 'ba'. Through the cooperation of the material holding part, the imprinting part, the current collector, and the base, the amount of adhesion per unit effective area is detected, and adhesion value data is obtained. Based on this data, the consistency of adhesion of the current collector per unit area is controlled. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A schematic diagram illustrating an embodiment of the lithium battery slurry detection device of the present invention is shown.

[0020] Figure 2 A schematic diagram illustrating an embodiment of the material holding section of the present invention is shown.

[0021] Figure 3 A schematic diagram illustrating the structure of an embodiment of the current collector of the present invention is shown.

[0022] Figure 4 A schematic diagram illustrating an embodiment of the embossing portion of the present invention is shown.

[0023] Figure 5 This schematically illustrates a structural view of an embodiment of the embossing portion of the present invention from another angle;

[0024] Figure 6 A schematic diagram illustrating an embodiment of the base of the present invention is shown.

[0025] Figure 7 The diagram schematically illustrates a structural view of an embodiment of the base of the present invention from another angle;

[0026] Figure 8 A schematic diagram illustrating an embodiment of the sampling component of the present invention is shown.

[0027] Figure 9 A flowchart illustrating an embodiment of the detection method of the present invention is shown schematically.

[0028] The above figures include the following reference numerals:

[0029] 10. Material holding section; 11. Receiving cavity; 20. Imprinting section; 21. Mounting surface; 22. Sampling section; 23. Handhold section; 231. Flat surface; 25. Annular boss; 30. Current collector; 31. Film; 40. Base; 41. Positioning cavity; 42. Sampling hole; 43. Manifold cavity; 44. Annular conical surface; 45. First opening; 46. Second opening; 47. Third opening; 48. Annular clearance groove; 49. Handle; 50. Sampling assembly. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] As described in the background section, lithium batteries are widely used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants; uninterruptible power supplies for telecommunications; and in various fields including power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace. The control of the lithium battery slurry process plays a crucial role in the performance of the manufactured battery. Insufficient viscosity consistency in the lithium battery slurry can lead to poor electrode coating quality, affecting battery performance.

[0032] To solve the above problem, see Figures 1 to 9 As shown, according to one aspect of the present invention, a lithium battery slurry testing device is provided, comprising a material holding part 10, an imprinting part 20, a current collector 30, and a base 40. The material holding part 10 has a receiving cavity 11 for holding battery slurry. The bottom of the imprinting part 20 has a mounting surface 21. The current collector 30 is detachably mounted on the mounting surface 21. The upper end of the base 40 has a positioning cavity 41, and the bottom wall of the positioning cavity 41 has a sampling hole 42. The imprinting part 20 is detachably mounted in the positioning cavity 41 to form a sampling assembly 50 together with the base 40. The sampling assembly 50 is placed in the material holding part 10, and the battery slurry can adhere to the current collector 30 through the sampling hole 42. The lithium battery slurry detection device of the present invention involves mounting the current collector 30 on the mounting surface 21 and weighing the current collector 30 and the imprinting part 20 together to obtain an initial weight 'a'; inserting the imprinting part 20 into the positioning cavity 41 so that the imprinting part 20 and the base 40 form a sampling assembly 50; placing the sampling assembly 50 into the material holding part 10 so that battery slurry adheres to the position of the current collector 30 corresponding to the sampling hole 42; vertically lifting the imprinting part 20 and tilting it to a predetermined angle, weighing the current collector 30 with battery slurry and the imprinting part 20 to obtain a detection weight 'b'; and calculating the adhesion value 'c' = 'ba'. Through the cooperation of the material holding part 10, the imprinting part 20, the current collector 30, and the base 40, the amount of adhesion per unit effective area is detected, and adhesion value data is obtained. Based on this data, the consistency of adhesion of the current collector 30 per unit area is controlled.

[0033] The lithium battery slurry testing device of the present invention is applicable to multi-system lithium battery slurries, and is related to the basic design application of lithium battery electrode surface density / battery structure. In the process of lithium battery slurry manufacturing and application, it improves coating debugging efficiency, surface density uniform distribution design, and improves the quality of lithium battery electrode coating process and battery performance.

[0034] See Figure 3 As shown, the current collector 30 can be made of aluminum foil, or other materials that are suitable for the adhesion of lithium battery slurry can be used. Preferably, the current collector 30 is 100mm*100mm in size. Take a double-sided adhesive sheet 31, the size of which should be smaller than the positioning size of the adhesive sheet 31. Use one side of the adhesive sheet 31 to stick to the four corners of the current collector 30 to ensure that it is flat and wrinkle-free, and stick the other side to the mounting surface 21.

[0035] See Figure 7 As shown, in order to accommodate and collect the battery slurry in the holding part 10 to the sampling hole 42, the outer side wall of the base 40 in this embodiment is adapted to the inner side wall of the holding part 10. The lower end of the base 40 is provided with a confluence cavity 43, and the confluence cavity 43 and the positioning cavity 41 are connected through the sampling hole 42.

[0036] In this embodiment, the sampling hole 42 is a circular hole, and the top wall of the manifold 43 is provided with an annular conical surface 44 inclined towards the center of the sampling hole 42. The annular conical surface 44 is coaxial with the sampling hole 42. The diameter of the circular hole is 10mm to 60mm. If the area of ​​the sampling hole 42 is too small, the sampling amount will be insufficient, resulting in inaccurate final data. If the area of ​​the sampling hole 42 is too large, the current collector 30 will be prone to wrinkling during sampling.

[0037] To further facilitate the collection of battery slurry in the holding section 10 towards the sampling port 42, a guide channel is provided on the base 40 in this embodiment. The first end of the guide channel forms a first opening 45 on the annular conical surface 44, and the second end of the guide channel forms a second opening 46 on the lower end surface of the base 40. During the process of placing the sampling component 50 into the holding section 10, the battery slurry in the holding section 10 is squeezed, and a portion of it flows from the guide channel in fluid form to the area around the sampling port 42. This ensures that the battery slurry passing through the sampling port 42 does not only originate from the top central area of ​​the holding section 10, but also guides battery slurry from other areas to the sampling port 42, where it adheres to the current collector 30, making the sampling more accurate.

[0038] Specifically, the flow channel in this embodiment includes a first inlet section and a second inlet section. The first inlet section is connected to the second inlet section, the first inlet section is connected to the second opening 46, and the second inlet section is connected to the first opening 45.

[0039] To guide the battery slurry from different areas of the holding section 10 to the sampling port 42, this embodiment employs multiple guide channels. These channels are spaced apart circumferentially along the base 40, and multiple first openings 45 all face the center of the sampling port 42. During the process of placing the sampling component 50 into the holding section 10, the battery slurry at the multiple second openings 46 enters the guide channels through the second openings 46 and then flows into the sampling port 42 through the multiple guide channels.

[0040] To facilitate smoother entry of the sampling component 50 into the material holding section 10, the first inlet section in this embodiment is a through hole extending along the height direction of the base 40, forming a third opening 47 on the upper surface of the base 40. This third opening 47 allows communication between the outside and the receiving cavity 11, preventing air stagnation and ensuring smooth entry of the sampling component 50 into the receiving cavity 11. Preferably, both the second opening 46 and the third opening 47 are elongated holes, which facilitates processing and allows the second opening 46 to cover a larger feeding area. After the sampling component 50 is placed in, the upper surface of the battery slurry in the material holding section 10 does not exceed the thickness of the base 40.

[0041] To facilitate the movement of the imprinting unit 20 by staff or robotic arms, the imprinting unit 20 in this embodiment includes a sampling unit 22 and a handheld unit 23 connected to the sampling unit 22. The outer wall of the sampling unit 22 is adapted to the inner wall of the positioning cavity 41. The upper end of the handheld unit 23 is provided with a flat surface 231 to facilitate the inverting of the imprinting unit 20. During operation, staff can move the imprinting unit 20 by hand or by controlling the handheld unit 23 with a robotic arm. After sampling, the imprinting unit 20 can be inverted via the flat surface 231 on the upper end of the handheld unit 23 for easy weighing. This structure adopts a circular and horizontal upper section that can be flipped, and a square lower section, with a smooth transition between the upper and lower sections.

[0042] Furthermore, in this embodiment, the bottom of the imprinting part 20 is provided with an annular boss 25, and an installation cavity is formed inside the annular boss 25. The installation surface 21 is formed on the top of the installation cavity, and the collector 30 is adapted to the installation cavity. The bottom wall of the positioning cavity 41 is provided with an annular relief groove 48, which is used to give way to the annular boss 25. On the one hand, the annular boss 25 prevents the collector 30 from sticking with slurry and causing the slurry to flow out during the flipping of the imprinting part 20 and the subsequent weighing process, thus reducing accuracy. On the other hand, the annular relief groove 48 gives way to the annular boss 25, preventing insufficient contact between the bottom of the collector 30 and the top of the positioning cavity 41, which would result in inaccurate sampling in the effective area of ​​the collector 30. This embodiment can ensure the effective sampling area of ​​the collector 30, where the effective area is the area corresponding to the sampling hole 42.

[0043] To facilitate the movement of the sampling component 50 by staff or robotic arms, a handle 49 is provided on the upper part of the base 40. There are two handles 49, which are symmetrically arranged on both sides of the base 40.

[0044] According to another aspect of the present invention, a method for detecting lithium battery slurry is provided, and a lithium battery slurry detection device is used in the method. The method includes: mounting a current collector 30 on a mounting surface 21 and weighing the current collector 30 and the imprinting part 20 together to obtain an initial weight a; inserting the imprinting part 20 into a positioning cavity 41 so that the imprinting part 20 and the base 40 form a sampling assembly 50; placing the sampling assembly 50 into a material holding part 10 so that battery slurry adheres to the position of the current collector 30 corresponding to the sampling hole 42; vertically lifting the imprinting part 20, tilting and flipping it to a predetermined angle, weighing the current collector 30 with battery slurry and the imprinting part 20 to obtain a detection weight b; and calculating the adhesion value c = ba.

[0045] Specifically, first, a 100*100mm current collector 30 is cut, and a double-sided film 31 is pinched. One side of the film 31 is used to adhere to the four corners of the current collector 30, ensuring it is flat and wrinkle-free. The current collector 30 and the film 31 assembly is then glued onto the mounting surface 21 in the mounting cavity. During installation, the positioning areas of the current collector 30 and the film 31 are strictly controlled, and the inner surfaces are glued flat and wrinkle-free. After assembly, the circular plane 231 on the imprinting part 20 is placed downwards and weighed to obtain the initial weight a.

[0046] The imprinting section 20 is vertically installed into the base 40 with the circular plane 231 facing upwards and the mounting cavity groove facing downwards, ensuring that the effective plane 231 of the current collector 30 is in seamless contact with the upper plane 231 of the positioning cavity 41 of the base 40; the mixing tank is filled with slurry and poured into the holding section 10, and the height of the slurry inside the holding section 10 is not greater than the total thickness of the base 40; the sampling component 50 is placed into the receiving cavity 11 by holding the handles 49 on both sides of the base 40, ensuring that the position of the upper plane 231 of the slurry is higher than the height of the sampling hole 42 of the base 40; the imprinting section is held vertically and lifted, and tilted and rotated 180°. After the slurry adhering to the current collector 30 slides off, it is stopped by the annular boss 25. The imprinting / current collector 30 / film 31 assembly is weighed to obtain the detection gravity b;

[0047] Finally, the difference is calculated to obtain the adhesion value c = ba, which is the adhesion data of current collector 30 in sampling hole 42. The adhesion of current collector 30 is different for different lithium battery slurry systems. Strict control of the adhesion consistency of the effective area of ​​the slurry in the application system is necessary. This facilitates the basic design and application of battery electrode surface density / battery structure, improves coating and debugging efficiency, and promotes uniform surface density distribution design, thereby improving the quality of lithium battery electrode coating process and battery performance.

[0048] Preferably, the aforementioned base is a first base, and the sampling hole radius of the first base is R. The method of the present invention further includes, after calculating the first adhesive value c = ba, calculating the first adhesive surface density d = c / πR. 2 Calculating the surface density provides a better measure of the difference and offers higher accuracy.

[0049] The lithium battery slurry testing device also includes n second bases in addition to the first base. The sampling holes of the second bases have different radii than those of the first bases. The radii of the sampling holes of the second bases are R1, R2, ..., R. n In calculating the first surface density d = c / πR 2 The method then further includes: repeatedly performing the above-described lithium battery slurry detection method to obtain n second adhesion values ​​corresponding to the second base, c1 = b1 - a1, c2 = b2 - a2, ..., c n =b n -a n Calculate the density of n second adhesive surfaces: d1 = c1 / πR1 2 d² = c² / πR² 2 ……, d n =c n / πR n 2 Based on the first viscous surface density and n second viscous surface densities, the average viscous surface density D is calculated as D = (d + d1 + d2 + ... + dn). n ) / (n+1). Where D is the standard value, and a standard control range is taken with the standard value as the center, such as ±0.5. The average surface density of the slurry in actual production is compared with this standard control range. If it is within the range, it meets the process requirements. If it is not within the range, the process of the slurry in this tank is readjusted.

[0050] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0051] By coordinating the material holding section, the imprinting section, the current collector, and the base, the amount of material adhering to a unit effective area is detected, and the adhesion value data is obtained. Based on this data, the consistency of adhesion to the current collector per unit area is controlled. This lithium battery slurry detection device is applicable to multi-system lithium battery slurries, and relates to the basic design application of lithium battery electrode surface density / battery structure. In the lithium battery slurry manufacturing and application process, it improves coating and debugging efficiency, achieves uniform surface density distribution design, and enhances the quality of lithium battery electrode coating process and battery performance.

[0052] It should be noted that the above detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0055] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., may be used here to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figure. It should be understood that spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the figure.

[0057] For example, if a device in the accompanying drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that, as generally described herein and illustrated in the accompanying drawings, aspects of this disclosure can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly considered herein.

[0059] This disclosure, based on the specific embodiments described in this application, is not intended to be limiting and is intended as an illustration of various aspects. As will be apparent to those skilled in the art, many modifications and variations can be made without departing from the spirit and scope of this disclosure. Functionally equivalent methods and apparatuses, in addition to those listed herein, will be apparent to those skilled in the art from the foregoing description within the scope of this disclosure. Such modifications and variations are intended to fall within the scope of the appended claims. This disclosure will be limited only by the terms of the appended claims and the full scope of equivalents of such claims. It will be understood that this disclosure is not limited to specific methods, reagents, compounds, compositions, or biological systems, which are of course subject to variation. It will also be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be restrictive.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lithium battery slurry testing device, characterized in that, include: The material holding part (10) has a receiving cavity (11) inside for holding battery slurry; Imprinting section (20), the bottom of which is provided with mounting surface (21); A current collector (30) is detachably mounted on the mounting surface (21); The base (40) has a positioning cavity (41) at its upper end and a sampling hole (42) on the bottom wall of the positioning cavity (41). The imprinting part (20) is detachably installed in the positioning cavity (41) to form a sampling assembly (50) together with the base (40). The sampling assembly (50) is placed in the material holding part (10) and the battery slurry can be adhered to the current collector (30) through the sampling hole (42). The bottom of the embossing part (20) is provided with an annular boss (25), and an installation cavity is formed inside the annular boss (25). The installation surface (21) is formed on the top of the installation cavity, and the current collector (30) is adapted to the installation cavity. The bottom wall of the positioning cavity (41) is provided with an annular clearance groove (48), which is used to make way for the annular boss (25). The upper part of the base (40) is provided with a handle (49).

2. The lithium battery slurry testing device according to claim 1, characterized in that, The outer side wall of the base (40) is adapted to the inner side wall of the material holding part (10). The lower end of the base (40) is provided with a manifold (43), and the manifold (43) and the positioning cavity (41) are connected through the sampling hole (42).

3. The lithium battery slurry testing device according to claim 2, characterized in that, The sampling hole (42) is a circular hole, and the top wall of the manifold (43) is provided with an annular conical surface (44) inclined toward the center of the sampling hole (42), and the annular conical surface (44) is coaxial with the sampling hole (42).

4. The lithium battery slurry testing device according to claim 3, characterized in that, The base (40) is provided with a flow channel, the first end of the flow channel forms a first opening (45) on the annular conical surface (44), and the second end of the flow channel forms a second opening (46) on the lower end surface of the base (40).

5. The lithium battery slurry testing device according to claim 4, characterized in that, The flow channel includes a first inlet section and a second inlet section. The first inlet section is connected to the second inlet section, the first inlet section is connected to the second opening (46), and the second inlet section is connected to the first opening (45).

6. The lithium battery slurry testing device according to claim 4, characterized in that, The flow channels are multiple, and the multiple flow channels are arranged at intervals along the circumference of the base (40), and the multiple first openings (45) are all facing the center of the sampling hole (42).

7. The lithium battery slurry testing device according to claim 5, characterized in that, The first inlet hole section is a through hole and extends along the height direction of the base (40), forming a third opening (47) on the upper surface of the base (40). Both the second opening (46) and the third opening (47) are elongated holes.

8. The lithium battery slurry testing device according to claim 7, characterized in that, The imprinting part (20) includes a sampling part (22) and a handheld part (23) connected to the sampling part (22). The outer side wall of the sampling part (22) is adapted to the inner side wall of the positioning cavity (41). The upper end of the handheld part (23) is provided with a plane (231) so as to make the imprinting part (20) upside down.

9. A method for detecting lithium battery slurry, characterized in that, The lithium battery slurry detection method uses the lithium battery slurry detection device according to any one of claims 1 to 8, and the method includes: The current collector (30) is installed on the mounting surface (21), and the current collector (30) and the imprinted part (20) are weighed together to obtain the initial weight a; The imprinting part (20) is inserted into the positioning cavity (41) so that the imprinting part (20) and the base (40) form the sampling assembly (50). The sampling component (50) is placed into the material holding part (10) so that the battery slurry adheres to the position of the current collector (30) corresponding to the sampling hole (42); The imprinting part (20) is lifted vertically and tilted and flipped to a predetermined angle. The current collector (30) with the battery paste and the imprinting part (20) are weighed to obtain the test weight b. Calculate the first adhesion value c=ba.

10. The lithium battery slurry detection method according to claim 9, characterized in that, The base is a first base, and the sampling hole radius of the first base is R. After calculating the first adhesive value c=ba, the method further includes: Calculate the first surface density d = c / πR².

11. The lithium battery slurry detection method according to claim 10, characterized in that, The lithium battery slurry testing device further includes n second bases in addition to the first base, wherein the sampling holes of the second bases have different radii than those of the sampling holes of the first bases. After calculating the first surface density, the method further includes: Repeat the lithium battery slurry detection method according to claim 9 to obtain n second adhesion values ​​corresponding to the n second bases; Calculate the density of n second adhesive surfaces; The average surface density is calculated based on the first surface density and n second surface densities.

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