Surface density uniformity detection device for lithium battery coating or pole piece

Abstract

The invention discloses a lithium battery coating or pole piece surface density uniformity detection device, which comprises a radioactivity generation device and a radioactive ray intensity detection device which are arranged at an interval, the radioactivity generation device comprises a box body made of a radioactive source shielding material, a beta radioactive source is arranged in the box body, and the beta radioactive source is arranged in the box body. The box body is provided with a window through which radioactive rays can be emitted, the detection end of the radioactive ray intensity detection device and the window are oppositely arranged in the front-back direction, and a detection space is formed between the detection end and the window. According to the invention, the surface density uniformity condition of the coating and the pole piece can be accurately reflected in real time, the detection efficiency is high, and the quality of the production process of the coating and the pole piece can be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of radioactivity detection, and in particular to a device and method for detecting the surface density uniformity of lithium battery coating or pole pieces. Background Art

[0002] As an important part of the green industry, the new energy battery industry has ushered in unprecedented development opportunities. However, with the expansion of the industry scale and technological advancement, the quality control of new energy batteries is also facing unprecedented challenges. Among them, the uniformity of the coating of new energy batteries and the consistency of the pole pieces will affect the energy density, charge and discharge performance, capacity attenuation, safety, life and heating performance of the battery. Therefore, in the production and quality control process of lithium batteries, it is very necessary to detect the uniformity of surface density. At present, most lithium battery manufacturers still use manual inspection for the inspection of lithium battery coating and pole pieces, which will have problems such as low efficiency and low measurement accuracy, which will eventually lead to poor quality of coating and pole piece production. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a device and method for detecting the surface density uniformity of lithium battery coating or pole piece with high detection efficiency and accuracy.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A device for detecting the uniformity of the surface density of a lithium battery coating or an electrode, comprising a radioactive generating device and a radioactive ray intensity detecting device which are arranged at intervals, wherein the radioactive generating device comprises a box body made of a radioactive source shielding material, a β radiation source is installed in the box body, a window is provided on the box body for emitting radioactive rays, a detection end of the radioactive ray intensity detecting device is arranged opposite to the window in a front-to-rear direction and a detection space is formed therebetween.

[0005] In the present invention, when in use, the coating or pole piece is placed in the detection space, and the surface density is measured by the degree of attenuation of the β-ray after penetrating the coating or pole piece. Materials of different thicknesses and densities absorb β-rays to different degrees, and by measuring the change in the intensity of the rays after penetration, the uniformity of the surface density of the coating or pole piece can be understood.

[0006] As an optimization, the radioactive ray intensity detection device includes a detector and a plurality of scintillators arranged in front of the window and arranged in a linear array, each scintillator is connected to a photomultiplier device respectively, the projection of the scintillator along the front-to-back direction is located within the projection of the window along the front-to-back direction, and the distance between each scintillator and the window is the same.

[0007] As an optimization, the box body is also provided with a box cover which can control the opening and closing of the window and is made of radiation source shielding material.

[0008] A method for detecting the uniformity of the surface density of a lithium battery coating or a pole piece, using the above-mentioned device for detecting the uniformity of the surface density of a lithium battery coating or a pole piece, obtaining the coating or the pole piece, making it unfolded and passing it through a detection space at a uniform speed, allowing the radioactive rays to pass through in a direction perpendicular to the plane where the coating or the pole piece is located and then be detected by a radioactive ray intensity detection device, and obtaining the intensity value of the penetrating rays corresponding to the detection position, and comparing the intensity value of the penetrating rays with a set reference intensity value to determine whether they are within the corresponding deviation range, thereby judging the uniformity of the surface density of the coating or the pole piece.

[0009] Compared with the prior art, the present invention can accurately reflect the uniformity of the surface density of the coating and the electrode in real time, has high detection efficiency, and can control the quality of the coating and electrode production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the coating or electrode piece detection process in the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0012] like Figure 1 As shown, the surface density uniformity detection device of the lithium battery coating or pole piece in this specific embodiment includes a radioactive generating device and a radioactive ray intensity detection device which are arranged separately. The radioactive generating device includes a box body made of a radioactive source shielding material, and a β radiation source 1 is installed in the box body. In this embodiment, the β radiation source 1 is 85 Kr, a window is provided on the box body to allow radioactive rays to emit, and the detection end of the radioactive ray intensity detection device is arranged opposite to the window in the front-to-back direction and a detection space is formed therebetween.

[0013] In this specific embodiment, the radioactive ray intensity detection device includes a detector and a plurality of scintillators 2 arranged in front of the window and arranged in a linear array. In this embodiment, the scintillator 2 is a scintillator containing a ZnS (Ag) coating. Each scintillator 2 is respectively connected to a photomultiplier device for signal connection. The projection of the scintillator 2 along the front-to-back direction is located within the projection of the window along the front-to-back direction, and the spacing between each scintillator 2 and the window is the same.

[0014] In this specific implementation, the box body is further provided with a box cover which is capable of controlling the opening and closing of the window and is made of radiation source shielding material.

[0015] A method for detecting the uniformity of the surface density of a lithium battery coating or a pole piece, using the above-mentioned device for detecting the uniformity of the surface density of a lithium battery coating or a pole piece, obtaining a pole piece 3, making it unfolded and passing through a detection space at a uniform speed, allowing radioactive rays to pass through in a direction perpendicular to the plane where the pole piece 3 is located and then be detected by a radioactive ray intensity detection device, obtaining the intensity value of the penetrating ray corresponding to the detection position, and comparing the intensity value of the penetrating ray with a set reference intensity value to determine whether it is within the corresponding deviation range, thereby judging the uniformity of the surface density of the pole piece 3.

[0016] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A device for detecting the uniformity of surface density of lithium battery coating or pole piece, characterized in that: It includes a radioactive generating device and a radioactive ray intensity detecting device which are arranged at intervals. The radioactive generating device includes a box body made of a radioactive source shielding material. A β radiation source is installed in the box body. A window for emitting radioactive rays is opened on the box body. The detection end of the radioactive ray intensity detecting device is arranged opposite to the window in the front-to-back direction and a detection space is formed therebetween.

2. The device for detecting surface density uniformity of lithium battery coating or pole piece according to claim 1, characterized in that: The radioactive ray intensity detection device includes a detector and a plurality of scintillators arranged in a linear array in front of the window, each scintillator is connected to a photomultiplier device respectively, the projection of the scintillator along the front-to-back direction is located within the projection of the window along the front-to-back direction, and the distance between each scintillator and the window is the same.

3. The device for detecting surface density uniformity of lithium battery coating or pole piece according to claim 1, characterized in that: The box body is also provided with a box cover which can control the opening and closing of the window and is made of radiation source shielding material.

4. A method for detecting the uniformity of surface density of lithium battery coating or pole piece, characterized in that: Use the surface density uniformity detection device for lithium battery coating or electrode as claimed in claim 1, obtain the coating or electrode, make it in an unfolded state and pass through the detection space at a uniform speed, so that the radioactive rays pass through in a direction perpendicular to the plane where the coating or electrode is located and are detected by the radioactive ray intensity detection device, and the intensity value of the penetrating ray corresponding to the detection position is obtained. By comparing the intensity value of the penetrating ray with the set reference intensity value, whether it meets the corresponding deviation range, the surface density uniformity of the coating or electrode is judged.

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