WO2024044966A1 - 极片检测的设备 - Google Patents

极片检测的设备 Download PDF

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Publication number
WO2024044966A1
WO2024044966A1 PCT/CN2022/115848 CN2022115848W WO2024044966A1 WO 2024044966 A1 WO2024044966 A1 WO 2024044966A1 CN 2022115848 W CN2022115848 W CN 2022115848W WO 2024044966 A1 WO2024044966 A1 WO 2024044966A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
collimator
width direction
coating
radiation
Prior art date
Application number
PCT/CN2022/115848
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English (en)
French (fr)
Inventor
展冰洋
张敬东
陈维刚
真志辉
王强军
晏亮杰
吴谦
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/115848 priority Critical patent/WO2024044966A1/zh
Publication of WO2024044966A1 publication Critical patent/WO2024044966A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
    • G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material

Definitions

  • the present application relates to the field of battery technology, and in particular, to an equipment for detecting pole pieces.
  • a battery is composed of a plurality of battery cells, each of which includes an electrode assembly.
  • the electrode assembly consists of a positive electrode piece and a negative electrode piece, and electrical energy is generated by metal ions moving between the positive electrode piece and the negative electrode piece.
  • the quality of the pole pieces is related to the performance and safety of the battery, so the pole pieces need to be tested.
  • This application provides a device for detecting pole pieces, which can effectively detect the surface density of pole piece materials in the entire area.
  • an equipment for detecting pole pieces includes: a radiation mechanism, the radiation mechanism is used to emit rays to the pole pieces, and the rays are arranged along the width direction of the pole pieces and cover the pole pieces. piece, and scan the pole piece along the length direction of the pole piece; and, a detection mechanism, the detection mechanism and the radiation mechanism are arranged oppositely on both sides of the pole piece, and the detection mechanism is used to The signal transmitted from the pole piece is detected, and the signal is used to detect the areal density of the material coated on the surface of the pole piece.
  • the pole piece detection equipment in the embodiment of the present application uses rays to detect the surface density of the pole piece. It includes a radiation mechanism and a detection mechanism relatively arranged on both sides of the pole piece. The rays emitted by the radiation mechanism are arranged along the width direction of the pole piece and The pole piece is covered, and the pole piece is scanned along the length direction of the pole piece, so that the detection mechanism detects the surface density of the material coated on the surface of the pole piece based on the signal transmitted by the pole piece. Since the ray covers the width direction of the pole piece, surface scanning of the pole piece is realized, and the two-dimensional distribution of the surface density in the width direction of the pole piece can be obtained. Compared with the single-point detection method, the detection accuracy is greatly improved. and sampling rate.
  • the device further includes a bracket, a window is provided on the bracket, the window is perpendicular to the length direction, and the detection mechanism and the radiation mechanism are respectively fixed on the window at opposite sides.
  • the two edges have a gap, so that the pole piece passes between the radiation mechanism and the detection mechanism through the gap.
  • the "back" shaped bracket is used to fix the detection mechanism and radiation mechanism, which has a simple structure and strong stability.
  • the material of the bracket is, for example, marble. Marble material has no stress deformation, small linear expansion coefficient and good stability.
  • the radiation mechanism includes: a radiation source for generating the rays; and a first housing for accommodating the radiation source, the first housing A window is provided on the side facing the detection mechanism, and the window is used to transmit the radiation. Placing the radioactive source in the first housing can effectively protect the radioactive source.
  • the radiation mechanism further includes: a first collimator, the first collimator is disposed between the radiation source and the pole piece, and is used for analyzing the radiation emitted by the radiation source.
  • the rays are collimated. Since the rays emitted by the radiation mechanism diverge at a certain solid angle, through the filtering of the first collimator, the rays can be irradiated to the surface of the pole piece with maximum efficiency, thereby achieving effective detection of the pole piece.
  • the first collimator includes a plurality of baffles disposed along the width direction and perpendicular to the surface of the pole piece. Using multiple baffles to form multiple collimation units has a simple structure and can effectively guide rays to various positions along the width direction of the pole piece surface.
  • the dimensions of the wire harness cross section of the radioactive source in the width direction and the length direction are W1 and L1 respectively, where 20mm ⁇ L1 ⁇ 50mm, and/or, 200mm ⁇ W1 ⁇ 1500mm . This size can meet the inspection needs of most sizes of pole pieces.
  • the size of each baffle in the width direction of the plurality of baffles of the first collimator and the size in the thickness direction of the pole piece are d and H1 respectively. , where, 0.2mm ⁇ d ⁇ 1mm, and/or, 1mm ⁇ H1 ⁇ 5mm. When d and H1 are within this range, the structural stability of the first collimator is ensured, the effective guidance of the rays is ensured, and the best detection effect can be obtained.
  • the first baffle and the last baffle among the plurality of baffles are spaced d/2 apart from the edge of the window; and/or , in the length direction, there is a distance d/2 between both ends of the plurality of baffles and the edge of the window.
  • the first collimator is fully utilized to collimate the rays emitted from the exit window of the radiation source on the first housing.
  • the detection mechanism includes: a detector array, the detector array includes M rows ⁇ N columns of detectors, the M rows of detectors are arranged along the width direction, and the N columns of detectors The detector is arranged along the length direction, M and N are positive integers; the second housing, the detector array is arranged on the wall of the second housing facing the radiation mechanism. A detector array composed of multiple detectors is disposed on the wall of the second housing facing the radiation mechanism, and the second housing can support and protect the detectors.
  • 1 ⁇ N ⁇ 10, and/or, 5 ⁇ M ⁇ 150 When the number of detectors in the width direction and length direction of the pole piece is within this range, detection accuracy is guaranteed and no additional cost will be incurred.
  • the distance between two adjacent detectors in the detector array is d, 0.2mm ⁇ d ⁇ 1mm.
  • the distance between two adjacent detectors is equal to the thickness of the baffle of the first collimator, which can make full use of the sensing area of each detector and effectively receive the rays transmitted from the first collimator, improving signal reception efficiency.
  • the detection mechanism further includes: a second collimator, the second collimator is disposed between the pole piece and the detector array, and is used to detect signals from the pole piece The transmitted signal is collimated. The direction of the signal transmitted from the pole piece will change.
  • Each collimation unit in the second collimator can guide the rays transmitted through the corresponding area on the pole piece to the corresponding detector, thereby detecting the rays in the width direction of the pole piece. Effective detection in all areas.
  • the second collimator includes a plurality of baffles disposed along the width direction and perpendicular to the surface of the pole piece. Multiple collimation units are formed by multiple baffles, which have a simple structure and can effectively guide signals transmitted by the pole pieces to corresponding detectors.
  • the distance between two adjacent baffles among the plurality of baffles of the second collimator is the distance between two adjacent baffles among the plurality of baffles of the first collimator. twice the distance between them. According to the relationship between the distance between two adjacent baffles in the second collimator and the distance between two adjacent baffles in the first collimator, or the baffle of the second collimator The relationship between the number of plates and the number of baffles of the first collimator is used to balance the number of detectors and detection accuracy.
  • the dimensions of the signal receiving window of each detector in the detector array in the width direction and the length direction are W2 and L2 respectively, where 1mm ⁇ W2 ⁇ 20mm, and/ Or, 1mm ⁇ L2 ⁇ 40mm.
  • the smaller the size of the detector the higher the detection precision, but it also increases the number of detectors for the same detection area. When the size of the detector is within this range, both detection precision and the number of detectors can be taken into consideration.
  • the size of each baffle in the width direction of the plurality of baffles of the second collimator and the size in the thickness direction of the pole piece are d and H2 respectively. , where, 0.2mm ⁇ d ⁇ 1mm, and/or, 1mm ⁇ H2 ⁇ 5mm. When d and H2 are within this range, the structural stability of the second collimator is ensured, the effective guidance of the transmitted signal is ensured, and the best detection effect can be obtained.
  • the distance between the detection mechanism and the radiation mechanism in the thickness direction of the pole piece is less than or equal to 15 mm.
  • a longer distance will affect the amount of signal received by the detection mechanism, and a shorter distance will affect the operation of the pole piece between the detection mechanism and the radiation mechanism.
  • the distance is within the above range, it is the standard for the pole piece and other components. Straighteners, etc. provide enough space and ensure the amount of signal received by the detector, reducing detection errors caused by air quality, temperature and humidity, dust environment, etc.
  • the device further includes a coating mechanism configured to apply the material to the surface of the pole piece. Therefore, this equipment can realize the detection of electrode pieces while coating them.
  • the coating mechanism includes: a coating roller, used to carry the pole piece; M coating dies, the M coating dies are arranged along the width direction and located at The coating roller is on one side away from the bracket, and the M coating dies are respectively connected to M discharge ports.
  • the coating dies are used to transport the material to the corresponding discharge ports. , so that the material is coated on the surface of the pole piece through the discharge port. Since there are M coating dies corresponding to M detectors in the width direction, the amount of material coated by the M coating dies on the pole pieces can be adjusted in a closed loop according to the detection results of the M detectors, thereby improving Improve coating consistency.
  • the M coating dies respectively correspond to M rows of detectors in the detector array of the detection mechanism
  • the coating mechanism further includes: M adjustment parts, and the M Each coating die head is provided correspondingly, and the adjustment part is used to adjust the size of the outlet connected to the corresponding coating die head according to the surface density detected by the corresponding detector.
  • the sizes of the M outlet openings are respectively controlled by M adjustment parts.
  • the M adjustment parts can respectively control the sizes of the M outlet openings based on the detection results of the M detectors, thereby improving the coating consistency in the width direction of the pole piece. .
  • the adjustment part includes an adjustment block and a driving device thereof.
  • the driving device is used to drive the adjustment block to move along the thickness direction of the pole piece to adjust the corresponding position through the adjustment block.
  • the driving block and its driving device are used to adjust the outlet of the coating die, which has a simple structure and high accuracy.
  • the dimensions of the portion of the adjustment block in contact with the material in the width direction and the length direction are W3 and L3 respectively, where 10mm ⁇ W3 ⁇ 30mm, and/or, 5mm ⁇ L3 ⁇ 20mm.
  • L3 is an integer multiple of L2
  • L2 is the size of the signal receiving window of each detector in the detector array in the length direction.
  • the adjustment amount of the discharge port matches the signal receiving window of the detector, which facilitates feedback adjustment of the size of the discharge port based on the detection results of the detector.
  • the moving distance of the driving device in the thickness direction of the pole piece is less than or equal to 200 mm.
  • the moving distance corresponds to the size of the outlet of the coating die. When it is located in the above range, it not only meets the variation range of the pole piece surface density after coating, but also reduces the occupied space.
  • the equipment further includes a first passing roller and a second passing roller, and the first passing roller and the second passing roller are respectively arranged on both sides of the bracket along the length direction, The first transfer roller and the second transfer roller are used to carry the pole piece.
  • the first passing roller and the second passing roller support the pole piece on both sides of the bracket, so that the pole piece can pass smoothly between the detection mechanism and the radiation mechanism, ensuring the detection effect.
  • the distance between the first roller and the second roller is less than or equal to 800 mm to better support the pole piece.
  • the rays are X-rays or ⁇ -rays. Strong penetration and easy access.
  • the power of the X-rays ranges from 200mci to 5000mci, and/or the power of the ⁇ -rays ranges from 12w to 20kw. It meets the needs of pole piece detection and reduces power consumption, reducing damage to the pole piece.
  • Figure 1 is a traditional schematic diagram used to detect the areal density of pole pieces
  • Figure 2 is a perspective view of the pole piece detection equipment according to the embodiment of the present application.
  • Figure 3 is a top view of the pole piece detection equipment according to the embodiment of the present application.
  • Figure 4 is a side view of the device for pole piece detection according to the embodiment of the present application.
  • Figure 5 is a schematic diagram of the assembly relationship between the radiation mechanism, the detection mechanism and the bracket according to the embodiment of the present application;
  • Figure 6 is a perspective view of the radiation mechanism according to the embodiment of the present application.
  • Figure 7 is a side view of the radiation mechanism according to the embodiment of the present application.
  • Figure 8 is a schematic diagram of the first collimator and the second collimator according to the embodiment of the present application.
  • Figure 9 is a perspective view of the detection mechanism according to the embodiment of the present application.
  • Figure 10 is a side view of the detection mechanism according to the embodiment of the present application.
  • Figure 11 is a schematic diagram of the coating mechanism according to the embodiment of the present application.
  • Figure 12 is a schematic diagram of the coating die and its adjustment part according to the embodiment of the present application.
  • Figure 13 is a schematic diagram of the size of the contact area between the adjustment block and the material according to the embodiment of the present application.
  • the battery in the embodiment of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell may include an electrode assembly and an electrolyte.
  • the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the current collector that is not coated with the positive electrode active material layer protrudes from the current collector that is coated with the positive electrode active material layer.
  • the current collector coated with the positive electrode active material layer serves as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the current collector that is not coated with the negative electrode active material layer protrudes from the current collector that is coated with the negative electrode active material layer.
  • the current collector coated with the negative active material layer serves as the negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be graphite, carbon or silicon.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the separator can be polypropylene (PP) or polyethylene (polyethylene, PE).
  • the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.
  • the principles of penetration and absorption of rays can be used to detect the weight of the material coated on the surface of the pole pieces and obtain the detection results of the areal density of the pole pieces surface to evaluate the coating. Cloth consistency. Specifically, after the ray passes through the tested material coated on the surface of the pole piece, the ray intensity will attenuate. By measuring the intensity of the ray beam passing through the material, the surface density of the tested material can be calculated.
  • pole pieces described in the embodiments of this application include positive electrode pieces, negative electrode pieces, positive electrode current collectors, negative electrode current collectors, separator materials and other sheet-like materials in the lithium battery industry.
  • the pole piece detection in the embodiments of this application The method can be used to detect any of the above types of pole pieces.
  • the radiation source and detector move along the width direction of the pole piece 100, that is, the width direction X, which is also called lateral movement; the pole piece 100 moves along its length direction Y, which is also called longitudinal movement. sports.
  • the radiation source reciprocates along the direction X to scan the surface of the pole piece 100 . It can be seen from Figure 1 that due to the superposition of lateral and longitudinal velocities, the scanning trajectories of all detection points on the surface of the pole piece 100 are in a "Z" shape.
  • the scanning speed is, for example, 1-24m/min.
  • a gas ionization chamber is mainly used to detect rays passing through the pole piece 100.
  • the ionization chamber requires a certain integration time to collect the rays.
  • the lateral resolution of the surface density is equal to the lateral size of the ray spot and the distance moved by the ionization chamber during the integration time. And, an increase in the scanning speed of the surface density will cause the lateral resolution to deteriorate. The worse the lateral resolution, the less conducive it is to detect the fluctuation of the surface density value of the pole piece 100 in a small lateral range.
  • the movement of the pole piece 100 itself will produce vibration, and the movement of the surface density meter will also produce vibration.
  • the distance between the radioactive source and the detector is relatively large, such as 15-40mm, air Changes in weight, temperature, humidity, dust and other factors will bring errors to the measurement system.
  • the encoder can be used to record the pole piece 100 and the scanning speed, and the surface density value at the corresponding position of the pole piece 100 can be calculated through time fitting, and then fed back to the coating die. Due to the error in the encoder measurement speed, there is a position error in the calculated surface density value of the pole piece 100, and there is also an error in the surface density value fed back to the corresponding position of the adjustment part of the coating die, which affects the judgment of the adjustment of the coating weight. .
  • this application provides a high-resolution, high-precision, real-time full surface density measurement system that uses two-dimensional imaging instead of small spot detection and scanning to achieve real-time full surface density detection and lateral resolution.
  • the rate can be accurate to 1-20mm, such as 5mm and 10mm.
  • the radioactive source and detector of the present application are static and do not need to move, static surface scanning is realized, eliminating the calculation error of the position in the dynamic scanning and the measurement error caused by air changes.
  • FIG. 2 is a perspective view of the device 200
  • FIG. 3 is a top view of the device 200
  • FIG. 4 is a side view of the device 200.
  • the device 200 includes a radiation mechanism 210 and a detection mechanism 220 .
  • the detection mechanism 220 and the radiation mechanism 210 are arranged oppositely on both sides of the pole piece 100 along the thickness direction Z thereof.
  • the radiation mechanism 210 is used to emit rays to the pole piece 100.
  • the rays are arranged along the width direction X of the pole piece 100 and cover the pole piece 100, and scan the pole piece 100 along the length direction Y of the pole piece 100;
  • the detection mechanism 220 uses For detecting the signal transmitted from the pole piece 100 , the signal is used to detect the areal density of the material coated on the surface of the pole piece 100 .
  • the pole piece detection equipment 200 uses rays to detect the surface density of the pole piece 100.
  • the rays emitted by the radiation mechanism 210 are arranged along the width direction X of the pole piece 100 and cover the pole piece 100, and along the The length direction Y of the pole piece 100 scans the pole piece 100 , so that the detection mechanism 220 can detect the surface density of the material coated on the surface of the pole piece 100 based on the signal transmitted from the pole piece 100 . Since the ray covers the width direction X of the pole piece 100, surface scanning of the pole piece 100 is realized, and the two-dimensional distribution of the surface density in the width direction Dadi improves detection accuracy and sampling rate.
  • the rays emitted by the radiation mechanism 210 may be, for example, X-ray beams or ⁇ -ray beams, which have strong penetrating power and are easy to obtain.
  • the power range of X-rays is, for example, 200mci to 5000mci, preferably 1000mci; the power range of ⁇ -rays is, for example, 12w to 20kw, preferably 500kw.
  • the power of the X-ray beam or ⁇ -ray beam is within the above corresponding range, it can meet the detection requirements of the pole piece 100, reduce power consumption, and reduce damage to the pole piece 100.
  • the energy of the rays emitted by the radiation mechanism 210 is attenuated after penetrating the pole piece 100.
  • the intensity of the rays irradiating the pole piece 100 and the intensity of the signal transmitted by the pole piece 100 satisfy, for example, Wherein, I 0 is the intensity of the radiation emitted by the radiation mechanism 210 to illuminate the pole piece 100 , I is the intensity of the signal transmitted by the pole piece 100 , ⁇ is the mass absorption coefficient of the material, and m is the surface density of the pole piece 100 .
  • the detection mechanism 220 receives the signal transmitted by the pole piece 100 and outputs the corresponding current signal. After the current signal is amplified by the amplifier, a voltage signal with a high signal-to-noise ratio is obtained.
  • the voltage signal is converted into a digital signal through the ADC, thereby obtaining the pole piece.
  • 100 of detection data after performing data processing on the detection data, the distribution of the surface density of the pole piece 100 in the width direction X can be obtained. It can be seen that the logarithm of the signal intensity transmitted by the pole piece 100 is inversely proportional to the surface density. Using rays to detect the surface density of the pole piece 100 is easy to implement and has high accuracy.
  • the device 200 further includes a bracket 230 for fixing the radiation mechanism 210 and the detection mechanism 220 .
  • a window 231 is provided on the bracket 230.
  • the window 231 is perpendicular to the length direction Y.
  • the detection mechanism 220 and the radiation mechanism 210 are respectively fixed on the two opposite edges of the window 231 with intervals, so that the pole pieces 100 passes between the radiation mechanism 210 and the detection mechanism 220 via a gap.
  • the "back" shaped bracket 230 is used to fix the detection mechanism 220 and the radiation mechanism 210, which has a simple structure and strong stability.
  • the distance G between the detection mechanism 220 and the radiation mechanism 210 is less than or equal to 15 mm, for example, 10 mm, and the thickness direction Z is perpendicular to the width direction X and the length direction Y.
  • a longer distance G will affect the signal quality received by the detection mechanism 220.
  • a shorter distance G will affect the operation of the pole piece 100 between the detection mechanism 220 and the radiation mechanism 210.
  • the distance G is within the above range, it is a pole piece. and other components such as collimators, etc., provide sufficient space, ensure the quality of signals received by the detection mechanism 220, and reduce detection errors caused by air quality, temperature, humidity, dust environment, etc.
  • the material of the bracket 230 may be marble, for example. Since the marble material has no stress deformation and a small linear expansion coefficient, it has good stability.
  • the device 200 further includes a coating mechanism 240 , which is used to apply material to the surface of the pole piece 100 . Therefore, the device 200 can realize coating and detection of the electrode piece 100 at the same time.
  • the equipment 200 further includes a first passing roller 250 and a second passing roller 260 .
  • the first passing roller 250 and the second passing roller 260 are respectively arranged along the length of the bracket 230 .
  • the first roller 250 and the second roller 260 are used to carry the pole piece 100 .
  • the first roller 250 and the second roller 260 are parallel to the bracket 230 and have the same level in the thickness direction Z, ensuring that the pole piece 100 passing through the surface of the first roller 250 and the second roller 260 is in contact with the radiation mechanism.
  • 210 and the detection mechanism 220 are kept parallel, and the pole piece 100 is centered on the surfaces of the radiation mechanism 210 and the detection mechanism 220 in the width direction X.
  • the first roller 250 and the second roller 260 support the pole piece 100 on both sides of the bracket 230 so that the pole piece 100 can smoothly pass between the detection mechanism 220 and the radiation mechanism 210, ensuring the detection effect.
  • the distance between the first transfer roller 250 and the second transfer roller 260 is, for example, less than or equal to 800 mm. To better support the pole piece 100 .
  • the device 200 can also be connected to a control system having peripheral supporting circuits and industrial computers.
  • the radiation mechanism 210 and the detection mechanism 220 do not move, and only the pole piece 100 moves along its length direction Y, thus eliminating the calculation error of the position in the dynamic scanning and the measurement error caused by air changes.
  • the radiation mechanism 210 includes a radiation source and a first housing 211.
  • the radiation source is used to generate rays; the first housing 211 is used to accommodate the radiation source.
  • the first housing 211 faces the side of the detection mechanism 220.
  • a window 2121 is provided on the surface, and the window 2121 is used to transmit the radiation. Placing the radioactive source in the first housing 211 can effectively protect the radioactive source.
  • a window 2121 is provided on the surface of the first housing 211 facing the detection mechanism 220 .
  • the first housing 211 may be composed of a housing part and an end cover 212.
  • the radioactive source is accommodated in the housing part.
  • the end cover 212 is used to cover the radioactive source in the housing part.
  • the window 2121 is provided in the end cover. 212, the rays emitted by the radioactive source can be irradiated onto the surface of the pole piece 100 through the window 2121.
  • the number of radioactive sources may be one or multiple.
  • a single radioactive source may be used, or multiple elongated radioactive sources arranged along the width direction X may be combined.
  • the radiation mechanism 210 formed by combining multiple radiation sources is used, the radiation intensity irradiated on each detection area along the width direction X of the pole piece 100 is the same, and the detection uniformity is better.
  • the radiation mechanism 210 further includes a first collimator 213 , and the first collimator 213 is disposed between the radiation source and the pole piece 100 .
  • the projection of the first collimator 213 on the surface of the first housing 211 facing the detection mechanism 220 is located in the opening 2121 . Since the rays emitted by the radiation mechanism 210 diverge at a certain solid angle, through the filtering of the first collimator 213 , the rays can be irradiated to the surface of the pole piece 100 with maximum efficiency, thereby achieving effective detection of the pole piece 100 .
  • the first collimator 213 may, for example, be composed of a plurality of baffles arranged along the width direction X and perpendicular to the surface of the pole piece 100 .
  • Using multiple baffles to form multiple collimation units has a simple structure and can effectively guide the rays emitted by the radiation source to various positions on the surface of the pole piece 100 along its width direction X.
  • the baffle is in the form of a thin sheet and may also be called a dividing sheet.
  • FIG. 8 shows the first collimator 213 formed by a plurality of baffles between the radiation mechanism 210 and the pole piece 100 .
  • the intensity of the rays emitted by the radioactive source gradually weakens from the center to the surroundings.
  • the rays are filtered by the front collimator 213, illuminate the surface of the pole piece 100 at a certain angle, and cover the pole piece along the width direction X. 100.
  • Two adjacent baffles among the plurality of baffles form a collimation unit, and the size of the area in the width direction X of the ray that irradiates on the pole piece 100 after passing through each collimation unit is S1.
  • the dimensions of the wire harness cross-section of the radioactive source in the width direction Select according to the required detection accuracy. For example, 20mm ⁇ L1 ⁇ 50mm, and/or, 200mm ⁇ W1 ⁇ 1500mm, this size can meet the detection needs of pole pieces of most sizes.
  • the size of each baffle in the width direction X and the size in the thickness direction Z of the plurality of baffles of the first collimator 213 are respectively d and H1, where, 0.2mm ⁇ d ⁇ 1mm, and/or, 1mm ⁇ H1 ⁇ 5mm.
  • d and H1 are within this range, the structural stability of the first collimator 213 is ensured, effective guidance of the rays is ensured, and the best detection effect can be obtained.
  • both ends of the plurality of baffles of the first collimator 213 are spaced apart from the edge of the window 2121 by d/2. Therefore, the first collimator 213 is fully utilized to collimate the rays coming out of the window 2121 on the first housing 211 .
  • the detection mechanism 220 includes a second housing 221 and a detector array.
  • the detector array includes M rows The direction X is set, and N columns of detectors are set along the length direction Y. M and N are positive integers.
  • the detector array is disposed on the wall 2211 on the side of the second housing 221 facing the radiation mechanism 210 .
  • the detection units in M rows and N columns have respective detection areas, and each detection unit is used to detect the signal transmitted from the corresponding area on the pole piece 100 .
  • a detector array composed of a plurality of detectors 222 is disposed on the wall 2211 on the side of the second housing 221 facing the radiation mechanism 210.
  • the second housing 221 can support and protect the detectors 222.
  • the range of N may be, for example, 1 ⁇ N ⁇ 10, preferably 3 or 5; the range of M, for example, may be 5 ⁇ M ⁇ 150, preferably 20 or 80.
  • the detection accuracy is guaranteed without causing additional cost and structural complexity.
  • the detection mechanism 220 further includes a second collimator 224 .
  • the second collimator 224 is disposed between the pole piece 100 and the detector array for detecting the slave.
  • the signal transmitted by the pole piece 100 is collimated.
  • the direction of the signal transmitted from the pole piece 100 will change.
  • Each collimation unit in the second collimator 224 can guide the rays transmitted through the corresponding area on the pole piece 100 to the corresponding detector 222, thereby aligning the pole piece.
  • Each area in the width direction of 100 is effectively detected.
  • the second collimator 224 may, for example, be composed of a plurality of baffles arranged along the width direction X and perpendicular to the surface of the pole piece 100 .
  • Multiple collimation units are formed by multiple baffles, which have a simple structure and can effectively guide signals transmitted through the pole piece 100 to the corresponding detector 222 .
  • the baffle is in the shape of a thin sheet and may also be called a dividing sheet.
  • a second collimator 224 formed by a plurality of baffles between the detection mechanism 220 and the pole piece 100 .
  • two adjacent baffles among multiple baffles form a collimation unit.
  • the multiple collimation units respectively correspond to multiple detectors 222 in the detector array.
  • the signal transmitted by the pole piece 100 passes through each After collimating the unit, it is received by the corresponding detector 222. That is to say, the multiple collimation units guide the transmission signals of multiple areas of the pole piece 110 to the corresponding multiple detectors 222 , and the multiple detectors 222 are respectively used to detect the transmission signals of multiple areas of the pole piece 100 . passed signal.
  • Each collimation unit can filter signals transmitted from other areas outside the detection distinction of its corresponding detector.
  • the size of the detection area in the width direction X is S2, and the detection areas corresponding to adjacent detectors 222 may or may not overlap.
  • each detector 222 After passing through the second collimator 224, each detector 222 receives the signal transmitted through its detection area. Each detector 222 converts the signal strength into a weak current signal, and uses a multi-channel parallel calculation method to calculate each detector.
  • the current signal output by the device 222 is input into an amplifier to convert it into a voltage signal with a high signal-to-noise ratio.
  • the voltage signal is converted into a corresponding digital signal through analog-to-digital conversion, and the measured material passing through the surface of the pole piece 100 can be obtained.
  • the subsequent ray intensity I is a corresponding digital signal through analog-to-digital conversion.
  • the distance between two adjacent detectors 222 in the detector array is d, 0.2mm ⁇ d ⁇ 1mm.
  • the distance between two adjacent detectors 222 is equal to the thickness of the baffle of the first collimator 219, which can fully utilize the sensing area of each detector and effectively receive the rays transmitted from the first collimator 210. , improving signal reception efficiency.
  • the relationship between the distance between two adjacent baffles in the second collimator 224 and the distance between two adjacent baffles in the first collimator 213, or the second collimator The relationship between the number of baffles 224 and the number of baffles of the first collimator 213 is used to balance the number of detectors 222 and detection accuracy.
  • the distance between two adjacent baffles among the plurality of baffles of the second collimator 224 is equal to the distance between two adjacent baffles among the plurality of baffles of the first collimator 213. twice the distance between them.
  • the dimensions of the signal receiving window of each detector 222 in the detector array in the width direction X and the length direction Y are W2 and L2 respectively.
  • the range of W2 can be, for example, 1mm ⁇ W2 ⁇ 20mm, preferably, W2 is 10mm;
  • the range of L2, for example, can be 1mm ⁇ L2 ⁇ 40mm, preferably, L2 is 10mm.
  • the area of the exit window of the collimation unit formed by two adjacent baffles of the first collimator 213 is (W1-d) ⁇ [(L2-d)/2].
  • the area of the exit window formed by two adjacent baffles of the second collimator 224 is (W1-d) ⁇ L2.
  • the size of the ray exit window of the radiation source is the size of the first collimator.
  • the size of each baffle in the width direction X and the size in the thickness direction Z of the plurality of baffles of the second collimator 224 are respectively d and H2, where, 0.2mm ⁇ d ⁇ 1mm, and/or, 1mm ⁇ H2 ⁇ 5mm.
  • d and H2 are within this range, the structural stability of the second collimator 224 is ensured, effective guidance of the transmitted signal is ensured, and the best detection effect can be obtained.
  • Figures 11 and 12 show the structure of the coating die 241 and its adjustment part 244 in the coating mechanism 240 of the embodiment of the present application.
  • Figure 13 is an enlarged view of area A in Figure 12.
  • Figure 13 shows The size of the part of the adjustment part 224 where the adjustment block 2241 contacts the material is determined.
  • the coating mechanism 240 includes a coating roller 242 and M coating dies 241.
  • the coating roller 242 is used to carry the pole piece 100, and the M coating dies 241 extend along the width direction.
  • the M coating die heads 241 are respectively connected to the M discharge ports 243. Each coating die head 241 is used to transport the material to the corresponding discharge port. 243, so that the material is coated on the surface of the pole piece 100 through the discharge port 243.
  • the M coating dies 241 respectively correspond to M rows of detectors in the detector array of the detection mechanism 220. Since there are M coating dies corresponding to the M detectors in the width direction The amount of material applied by the die on the pole piece 100 can be adjusted in a closed loop based on the detection results of the M detectors, thereby improving the coating consistency.
  • the coating mechanism 200 also includes M adjustment parts 244 corresponding to the M coating dies 241 , and each adjustment part 244 is used to detect the The surface density detected by the detector 222 is used to adjust the size of the outlet 243 connected to the corresponding coating die 241. Since the sizes of the M outlet openings 243 are respectively controlled by the M adjusting parts 244, the M adjusting parts 244 can respectively control the sizes of the M outlet openings 243 according to the detection results of the M detectors 222, thereby realizing the adjustment of the counterpole piece 100.
  • the closed-loop automatic adjustment of the surface density value improves the coating consistency in the width direction X of the pole piece 100.
  • the adjustment part 244 includes an adjustment block 2441 and its driving device 2442 .
  • the driving device 2442 is used to drive the adjustment block 2441 to move along the thickness direction Z to adjust through the adjustment block 2441 The corresponding size of the discharge port 243 connected to the coating die 241.
  • the driving block 2441 and its driving device 2442 are used to adjust the discharge port 243, which has a simple structure and high accuracy.
  • the driving device 2442 may be a motor, for example.
  • the adjustment part 244 also includes a conversion slider 2444, a fixed seat 2445, and the like.
  • the adjusting block 2441 is in a high position, and the size of the discharge port 243 is the largest.
  • a high-precision thread link can be used between the shaft of the driving device 2442 and the conversion slider 2444.
  • the driving device 2442 rotates at a certain angle, and the conversion slider 2444 rotates at a certain angle.
  • the block 2444 will slide along the fixed seat 2445, that is, the rotational motion is converted into linear motion through high-precision threads.
  • the connecting rod of the conversion slider 2444 and the adjustment block 2441 is threaded, and the adjustment block 2441 moves up and down along the conversion slider 2444. , to achieve the purpose of adjusting the size of the discharge port 243.
  • the dimensions of the portion of the adjustment block 2441 in contact with the material in the width direction X and the length direction Y are W3 and L3 respectively.
  • the adjustment block 2441 may be rectangular, diamond-shaped, stepped, etc.
  • L3 is usually greater than or equal to L2.
  • L3 is an integer multiple of L2
  • L2 is the size of the signal receiving window of each detector 222 in the detector array in the length direction Y.
  • the adjustment amount of the discharge port 243 matches the signal receiving window of the detector, which facilitates feedback adjustment of the size of the discharge port 243 based on the detection results of the detector 222.
  • the moving distance of the driving device 2442 in the thickness direction Z is, for example, less than or equal to 200 mm.
  • the moving distance corresponds to the size of the outlet 243 in the thickness direction Z. When it is located in the above range, it not only meets the variation range of the surface density of the coated pole piece 100, but also reduces the occupied space.
  • the pole piece detection device 200 can perform real-time full-area detection of the surface density of the pole piece 100 during the coating process of the pole piece 100 .
  • the slurry output from the outlet 243 is coated on the surface of the pole piece 100, and then when the pole piece 100 moves between the radiation mechanism 210 and the detection mechanism 220,
  • the radiation mechanism 210 covers the width direction X of the pole piece 100 to obtain two-dimensional detection data along the width direction X of the pole piece 100 .
  • the size of the discharge port 243 can be adjusted through feedback through the adjustment part 224 to improve the consistency of the surface density of the pole piece 100 along the width direction X.
  • the driving device 2442 controls the up and down height of the adjusting block 2441, and uses the up and down movement of the adjusting block 2441 to change the size of the corresponding discharge port 243.
  • the size of the outlet 243 becomes smaller, the slurry flow rate becomes smaller, the coating weight of the pole piece 100 becomes smaller, and the area density of the corresponding position becomes smaller; the size of the outlet 243 becomes larger, the slurry flow rate becomes larger, and the pole piece 100 becomes smaller.
  • the coating weight of 100 becomes larger, and the area density at the corresponding position becomes larger. In this way, the surface density of the local area of the pole piece 100 can be adjusted.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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Abstract

本申请提供一种极片检测的设备，能够有效地对极片材料的面密度进行全区域检测。所述设备包括：放射机构，所述放射机构用于向极片发出射线，所述射线沿所述极片的宽度方向设置并覆盖所述极片，且沿所述极片的长度方向对所述极片进行扫描；探测机构，所述探测机构和所述放射机构相对设置在所述极片的两侧，所述探测机构用于检测从所述极片透射的信号，所述信号用于检测所述极片的表面涂布的材料的面密度。

Description

极片检测的设备 技术领域
本申请涉及电池技术领域，特别地，涉及一种极片检测的设备。
背景技术
节能减排是汽车产业可持续发展的关键。在这种情况下，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。而对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
通常，电池由多个电池单体组成，每个电池单体中包括电极组件。电极组件由正极片和负极片组成，通过金属离子在正极片和负极片之间移动来产生电能。极片的品质关系到电池的性能和安全，因此需要对极片进行检测。
发明内容
本申请提供一种极片检测的设备，能够有效地对极片材料的面密度进行全区域检测。
第一方面，提供一种极片检测的设备，所述设备包括：放射机构，所述放射机构用于向极片发出射线，所述射线沿所述极片的宽度方向设置并覆盖所述极片，且沿所述极片的长度方向对所述极片进行扫描；以及，探测机构，所述探测机构和所述放射机构相对设置在所述极片的两侧，所述探测机构用于检测从所述极片透射的信号，所述信号用于检测所述极片的表面涂布的材料的面密度。
本申请实施例中的极片检测的设备利用射线对极片进行面密度检测，其包括相对设置在极片两侧的放射机构和探测机构，放射机构发出的射线沿极片的宽度方向设置并覆盖该极片，且沿该极片的长度方向对该极片进行扫描，从而探测机构根据该极片透射的信号，检测极片表面涂布的材料的面密度。由于该射线覆盖极片的宽度方向，实现了对极片的面扫描，可以获得极片宽度方向上的面密度的二维分布情况，相比于单点检测的方式，极大地提高了检测精度和采样率。
在一种实现方式中，所述设备还包括支架，所述支架上设置有窗口，所述窗口垂直于所述长度方向，所述探测机构和所述放射机构分别固定在所述窗口上相对的两个边缘且具有间隔，以使所述极片经由所述间隔从所述放射机构和所述探测机构之间穿过。采用“回”形支架固定探测机构和放射机构，结构简单且稳定性强。所述支架的材料例如为大理石，大理石材料无应力变形，线性膨胀系数小，稳定性较好。
在一种实现方式中，所述放射机构包括：放射源，用于产生所述射线；以及，第一壳体，所述第一壳体用于容纳所述放射源，所述第一壳体朝向所述探测机构的一侧设置有开窗，所述开窗用于透过所述射线。将放射源置于第一壳体内，可以形成对放射源的有效保护。
在一种实现方式中，所述放射机构还包括：第一准直器，所述第一准直器设置在所述放射源和所述极片之间，用于对所述放射源发出的所述射线进行准直。由于放射机构发出的射线呈一定立体角发散，通过第一准直器的过滤，能够将射线最大效率地照射至极片的表面，实现对极片的有效检测。
在一种实现方式中，所述第一准直器包括多个挡板，所述多个挡板沿所述宽度方向设置且垂直于所述极片的表面。利用多个挡板形成多个准直单元，结构简单，且能够有效地将射线引导至极片表面沿其宽度方向上的各个位置。
在一种实现方式中，所述放射源的线束截面在所述宽度方向和所述长度方向上的尺寸分别为W1和L1，其中，20mm≤L1≤50mm，和/或，200mm≤W1≤1500mm。该尺寸能够满足对大多数尺寸的极片的检测需求。
在一种实现方式中，所述第一准直器的多个挡板中每个挡板在所述宽度方向上的尺寸、以及在所述极片的厚度方向上的尺寸分别为d和H1，其中，0.2mm≤d≤1mm，和/或，1mm≤H1≤5mm。d和H1位于该范围时，即保证了第一准直器的结构稳定性，也保证了对射线的有效引导，能够获得最佳的检测效果。
在一种实现方式中，在所述宽度方向上，所述多个挡板中第一个挡板和最后一个挡板，均与所述开窗的边缘之间间隔d/2；和/或，在所述长度方向上，所述多个挡板的两个端部均与所述开窗的边缘之间间隔d/2。从而充分利用第一准直器对第一壳体上放射源的出射窗口发出的射线进行准直。
在一种实现方式中，所述探测机构包括：探测器阵列，所述探测器阵列包括M行×N列个探测器，所述M行探测器沿所述宽度方向设置，所述N列探测器沿所述长度 方向设置，M和N为正整数；第二壳体，探测器阵列设置在所述第二壳体朝向放射机构一侧的壁上。由多个探测器组成的探测器阵列设置于第二壳体朝向放射机构一侧的壁上，第二壳体可以形成对探测器的支撑和保护。
在一种实现方式中，1≤N≤10，和/或，5≤M≤150。当极片宽度方向和长度方向上的探测器数量位于该范围时，即保证了检测精度，也不会带来额外的成本。
在一种实现方式中，所述探测器阵列中相邻两个探测器之间的间距为d，0.2mm≤d≤1mm。相邻两个探测器之间的间距与第一准直器的挡板的厚度相等，能够充分利用每个探测器的感应区域，有效地接收从第一准直器透过的射线，提高了信号接收效率。
在一种实现方式中，所述探测机构还包括：第二准直器，所述第二准直器设置在所述极片和所述探测器阵列之间，用于对从所述极片透射的信号进行准直。从极片透射的信号的方向会发生改变，第二准直器中的每个准直单元能够将极片上对应区域透过的射线引导至对应的探测器，从而对极片的宽度方向上的各个区域进行有效检测。
在一种实现方式中，所述第二准直器包括多个挡板，所述多个挡板沿所述宽度方向设置且垂直于所述极片的表面。通过多个挡板形成多个准直单元，结构简单，且能够有效地将极片透过的信号引导至对应的探测器上。
在一种实现方式中，所述第二准直器的多个挡板中相邻两个挡板之间的距离，为第一准直器的多个挡板中相邻两个挡板之间的距离的两倍。根据第二准直器中相邻两个挡板之间的距离，与第一准直器中相邻两个挡板之间的距离之间的关系，或者说是第二准直器的挡板数量与第一准直器的挡板数量之间的关系，来平衡探测器的数量和检测精度。
在一种实现方式中，所述探测器阵列中每个探测器的信号接收窗口在所述宽度方向和所述长度方向上的尺寸分别为W2和L2，其中，1mm≤W2≤20mm，和/或，1mm≤L2≤40mm。探测器的尺寸越小，检测精细度越高，但对于相同检测面积而言也增加了探测器的数量，当探测器的尺寸位于该范围时，能够兼顾检测精细度和探测器的数量。
在一种实现方式中，所述第二准直器的多个挡板中每个挡板在所述宽度方向上的尺寸、以及在所述极片的厚度方向上的尺寸分别为d和H2，其中，0.2mm≤d≤1mm，和/或，1mm≤H2≤5mm。d和H2位于该范围时，即保证了第二准直器的结构稳 定性，也保证了对透射信号的有效引导，能够获得最佳的检测效果。
在一种实现方式中，在所述极片的厚度方向上，所述探测机构和所述放射机构之间的距离小于或等于15mm。该距离较远会影响探测机构接收到的信号量，该距离较近又会影响极片在探测机构和放射机构之间的运行，当该距离位于上述范围时，为极片及其他部件比如准直器等提供了足够的空间，又保证了探测器接收到的信号量，减小了空气质量、温湿度、粉尘环境等造成的检测误差。
在一种实现方式中，所述设备还包括涂布机构，所述涂布机构用于向所述极片的表面涂布所述材料。因此，该设备能够实现对极片的一边涂布一边检测。
在一种实现方式中，所述涂布机构包括：涂布辊，用于承载所述极片；M个涂布模头，所述M个涂布模头沿所述宽度方向设置，且位于所述涂布辊远离所述支架的一侧，所述M个涂布模头分别连接M个出料口，所述涂布模头用于将所述材料输送至对应的所述出料口，以使所述材料通过所述出料口涂布在所述极片的表面。由于在宽度方向上设置有与M个探测器对应的M个涂布模头，M个涂布模头在极片上涂布的材料量可以分别根据M个探测器的检测结果进行闭环调节，提升了涂布一致性。
在一种实现方式中，所述M个涂布模头分别对应于所述探测机构的探测器阵列中的M行探测器，所述涂布机构还包括：M个调节部，与所述M个涂布模头对应设置，所述调节部用于根据对应的所述探测器检测的面密度，调整对应的所述涂布模头连接的所述出料口的尺寸。M个出料口的尺寸分别由M个调节部控制，M个调节部可以分别根据M个探测器的检测结果控制M个出料口的尺寸，从而提升极片宽度方向上的涂布一致性。
在一种实现方式中，所述调节部包括调节块及其驱动装置，所述驱动装置用于驱动所述调节块沿所述极片的厚度方向上运动，以通过所述调节块调整对应的所述涂布模头连接的所述出料口的尺寸。利用驱动块及其驱动装置来实现对涂布模头的出料口的调节，结构简单且准确性高。
在一种实现方式中，所述调节块与所述材料接触的部分在所述宽度方向和所述长度方向上的尺寸分别为W3和L3，其中，10mm≤W3≤30mm，和/或，5mm≤L3≤20mm。通过合理设置调节块与材料接触的区域的尺寸，能够在满足涂布均匀性的要求的同时，减少调节块的数量。
在一种实现方式中，L3为L2的整数倍，L2为探测器阵列中每个探测器的信号 接收窗口在所述长度方向上的尺寸。L3为L2的整数倍时，对出料口的调节量与探测器的信号接收窗口相匹配，便于根据探测器的检测结果对出料口的尺寸进行反馈调整。
在一种实现方式中，所述驱动装置在所述极片的厚度方向上的移动距离小于或等于200mm。该移动距离与涂布模头的出料口的尺寸对应，当其位于上述范围时，既满足了涂布后的极片面密度的变化范围，也减少了所占用的空间位置。
在一种实现方式中，所述设备还包括第一过辊和第二过辊，所述第一过辊和所述第二过辊分别设置在所述支架沿所述长度方向的两侧，所述第一过辊和所述第二过辊用于承载所述极片。通过第一过辊和第二过辊，对极片位于支架的两侧进行支撑，使极片能够平稳地从探测机构和放射机构之间经过，保证了检测效果。
在一种实现方式中，所述第一过辊和所述第二过辊之间的距离小于或等于800mm，以更好地对极片进行支撑。
在一种实现方式中，所述射线为X射线或者β射线。穿透力强且易于获取。
在一种实现方式中，所述X射线的功率的范围为200mci至5000mci，和/或，所述β射线的功率的范围为12w至20kw。满足极片检测的需求且降低了功耗，减少了对极片造成的伤害。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1是传统的用于检测极片的面密度的示意图；
图2是本申请实施例的极片检测的设备的立体图；
图3是本申请实施例的极片检测的设备的俯视图；
图4是本申请实施例的极片检测的设备的侧视图；
图5是本申请实施例的放射机构和探测机构与支架之间的装配关系的示意图；
图6是本申请实施例的放射机构的立体图；
图7是本申请实施例的放射机构的侧视图；
图8是本申请实施例的第一准直器和第二准直器的示意图；
图9是本申请实施例的探测机构的立体图；
图10是本申请实施例的探测机构的侧视图；
图11是本申请实施例的涂布机构的示意图；
图12是本申请实施例的涂布模头及其调节部的示意图；
图13是本申请实施例的调节块与材料接触区域的尺寸的示意图；
在附图中，附图并未按照实际的比例绘制。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的设备或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成设备的整体厚度、长宽等尺寸仅为示例性说明， 而不应对本申请构成任何限定。
本申请的实施例中的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体可以包括电极组件和电解液，电极组件由正极片、负极片和隔离膜组成。电池单体主要依靠金属离子在正极片和负极片之间移动来工作。正极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的集流体凸出于已涂覆正极活性物质层的集流体，未涂敷正极活性物质层的集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的集流体凸出于已涂覆负极活性物质层的集流体，未涂敷负极活性物质层的集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为石墨、碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔膜的材质可以为聚丙烯(polypropylene，PP)或聚乙烯(polyethylene，PE)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。
目前，在电池例如锂电池的极片生产过程中，可以利用射线的穿透和吸收的原理，检测极片表面涂布的材料的重量，得到极片表面的面密度的检测结果，以评价涂布一致性。具体地，射线穿过极片表面上涂布的被测材料后，射线强度会衰减，通过测定穿过该材料的射线束强度，可以计算出被测材料的面密度。
应理解，本申请实施例中所述的极片，包括正极极片、负极极片、正极集流体、负极集流体、隔膜材料等锂电行业的薄片状材料，本申请实施例中的极片检测的方法，可以用来检测上述任一类型的极片。
例如，如图1所示的面密度仪，放射源和探测器沿着极片100的幅宽方向即宽度方向X运动，也称横向运动；极片100沿其长度方向Y运动，也称纵向运动。放射源沿方向X往复运动，以对极片100的表面进行扫描。从图1中可以看出，由于横向和纵向的速度叠加，所有的检测点在极片100的表面上的扫描轨迹呈“Z”字形。
往返扫描一次极片100走过的距离S＝2*L*V1/V2，其中，L为极片100的宽度，V1极片100的运行速度，例如5-150m/min，V2为面密度仪的扫描速度，例如1-24m/min，随着极片100涂布的速度的增加，面密度仪往返扫描一次极片100所走过的距离S越大，检测的覆盖率越低，极片100表面涂布的材料重量的波动不能被及时被检测和反馈。
目前，用于检测穿过极片100的射线主要采用气体电离室，电离室收集射线需要一定的积分时间，面密度的横向分辨率等于射线光斑的横向尺寸与电离室积分时间内移动的距离之和，面密度的扫描速度的提高会使得横向分辨率会恶化，横向分辨率越差，越不利于检测极片100在横向小范围内的面密度值的波动。
另外，极片100本身的运动会产生震动，面密度仪的移动也会产生震动，为防止面密度仪刮破极片100，放射源与探测器之间的间距较大，例如15-40mm，空气的重量、温湿度、粉尘等因素的变化会给测量系统带来误差。
可以使用编码器记录极片100及扫描速度，通过时间拟合计算得出极片100对应位置上的面密度值，然后反馈涂布模头。由于编码器测量速度的误差，计算的极片100的面密度值存在位置误差，反馈给涂布模头的调节部的对应位置的面密度值也存在误差，影响对涂布重量的调节的判断。
这些因素均影响极片面密度检测效果和一致性的提升。为此，本申请提供了一种高分辨率、高精度、实时性全检面密度测量系统，采用二维成像的方式代替小光斑检测和扫描，实现了极片面密度的实时全检，横向分辨率能够精确至1-20mm，例如5mm和10mm。并且，由于本申请的放射源和探测器是静态的无需移动，实现静态面扫描，消除了上述动态扫描中的位置的计算误差和空气变化引起的测量误差。面密度值及其对应的极片上的物理位置、以及涂布模头的调节部之间一一对应，没有位置误差，还能够提高闭环反馈的实时性，进而提升极片涂布的一致性。
图2至图4示出了本申请实施例的一种极片检测的设备200。其中，图2是设备200的立体示意图，图3是设备200的俯视图，图4是设备200的侧视图。
如图2所示，设备200包括放射机构210和探测机构220，探测机构220和放射机构210相对设置在极片100沿其厚度方向Z的两侧。其中，放射机构210用于向极片100发出射线，射线沿极片100的宽度方向X设置并覆盖极片100，且沿极片100的长度方向Y对极片100进行扫描；探测机构220用于检测从极片100透射的信号，该信号 用于检测极片100的表面涂布的材料的面密度。
可见，在本申请实施例中，极片检测的设备200利用射线对极片100进行面密度检测，放射机构210发出的射线沿极片100的宽度方向X设置并覆盖该极片100，且沿该极片100的长度方向Y对该极片100进行扫描，从而探测机构220能够根据从该极片100透射的信号，检测极片100表面涂布的材料的面密度。由于该射线覆盖极片100的宽度方向X，实现了对极片100的面扫描，可以获得极片100宽度方向X上的面密度的二维分布情况，相比于单点检测的方式，极大地提高了检测精度和采样率。
放射机构210发出的射线，例如可以是X射线束或者β射线束，穿透力强且易于获取。X射线的功率的范围例如为200mci至5000mci，优选地，可以为1000mci；β射线的功率的范围例如为12w至20kw，优选地，可以为500kw。当X射线束或者β射线束的功率位于上述相应范围时，能够满足极片100检测的需求，且降低了功耗，减少了对极片100造成的伤害。
放射机构210发出的射线穿透极片100后能量衰减，照射极片100的射线的强度与极片100透射的信号的强度之间例如满足
Figure PCTCN2022115848-appb-000001
其中，I 0为放射机构210发出的用于照射极片100的射线的强度，I为极片100透射的信号的强度，λ为材料的质量吸收系数，m为极片100的面密度。探测机构220接收极片100透射的信号，并输出对应的电流信号，该电流信号经过放大器的放大后，得到高信噪比的电压信号，该电压信号通过ADC转换为数字信号，从而得到极片100的检测数据，对该检测数据进行数据处理后，可以的到极片100的面密度在宽度方向X上的分布情况。可见，极片100透射的信号强度的对数与面密度成反比，利用射线对极片100进行面密度检测，易于实现且准确性高。
在一种实现方式中，设备200还包括用于固定放射机构210和探测机构220的支架230。例如，如图5所示，支架230上设置有窗口231，窗口231垂直于长度方向Y，探测机构220和放射机构210分别固定在窗口231上相对的两个边缘且具有间隔，以使极片100经由间隔从放射机构210和探测机构220之间穿过。采用“回”形支架230固定探测机构220和放射机构210，结构简单且稳定性强。
在极片100的厚度方向Z上，探测机构220和放射机构210之间的距离G小于或等于15mm，例如为10mm，厚度方向Z垂直于宽度方向X和长度方向Y。距离G较远会影响探测机构220接收到的信号质量，距离G较近又会影响极片100在探测机 构220和放射机构210之间的运行，当距离G位于上述范围时，既为极片及其他部件比如准直器等提供了足够的空间，又保证了探测机构220接收到的信号质量，减小了空气质量、温湿度、粉尘环境等造成的检测误差。
支架230的材料例如可以是大理石等，由于大理石材料无应力变形，线性膨胀系数小，因此稳定性较好。
在一种实现方式中，如图2至图4所示，设备200还包括涂布机构240，涂布机构240用于向极片100的表面涂布材料。因此，设备200能够实现对极片100的一边涂布一边检测。
在一种实现方式中，如图2至图4所示，设备200还包括第一过辊250和第二过辊260，第一过辊250和第二过辊260分别设置在支架230沿长度方向Y的两侧，第一过辊250和第二过辊260用于承载极片100。第一过辊250和第二过辊260与支架230平行，且在厚度方向Z上的水平高度一致，保证从第一过辊250和第二过辊260表面穿过的极片100与放射机构210和探测机构220保持平行，且使极片100在宽度方向X上居中于放射机构210和探测机构220的表面。
通过第一过辊250和第二过辊260，对极片100位于支架230的两侧进行支撑，使极片100能够平稳地从探测机构220和放射机构210之间经过，保证了检测效果。第一过辊250和第二过辊260之间的距离例如小于或等于800mm。以更好地对极片100进行支撑。
设备200还可以连接有外围配套电路和工控机的控制系统。在检测过程中，放射机构210和探测机构220是不移动的，仅极片100沿其长度方向Y移动，因此消除了上述动态扫描中的位置的计算误差和空气变化引起的测量误差。
以下，结合图6至图10，对放射机构210和探测机构220进行详细描述。
在一种实现方式中，放射机构210包括放射源和第一壳体211，放射源用于产生射线；第一壳体211用于容纳放射源，第一壳体211朝向探测机构220一侧的表面设置有开窗2121，开窗2121用于透过该射线。将放射源置于第一壳体211内，可以形成对放射源的有效保护。
例如，如图6和图7所示，第一壳体211朝向探测机构220的表面上设置有开窗2121。具体地，第一壳体211可以由壳体部和端盖212组成，放射源容纳于壳体部内，端盖212用于将该放射源盖合于壳体部内，开窗2121设置在端盖212上，该放射 源发出的射线可以透过开窗2121照射至极片100的表面上。
放射源的数量可以是一个也可以是多个，例如，可以采用单体放射源，或者将沿宽度方向X设置的多个长条形放射源拼合。当采用多个放射源拼合形成的放射机构210时，极片100沿宽度方向X上的各个检测区域上被照射的射线强度相同，检测均匀性更好。
在一种实现方式中，如图6和图7所示，放射机构210还包括第一准直器213，第一准直器213设置在放射源和极片100之间。第一准直器213在第一壳体211朝向探测机构220的表面上的投影位于开窗2121内。由于放射机构210发出的射线呈一定立体角发散，通过第一准直器213的过滤，能够将射线最大效率地照射至极片100的表面，实现对极片100的有效检测。
第一准直器213例如可以由多个挡板组成，多个挡板沿宽度方向X设置且垂直于极片100的表面。利用多个挡板形成多个准直单元，结构简单，且能够有效地将放射源发出的射线引导至极片100表面沿其宽度方向X上的各个位置。该挡板为薄片状，也可以称为分割片。
图8示出了放射机构210和极片100之间由多个挡板形成的第一准直器213。如图8所示，放射源发出的射线的强度沿中心向四周逐渐减弱，该射线经过前准直器213的过滤，呈一定角度照射在极片100的表面，并沿宽度方向X覆盖极片100。多个挡板中相邻两个挡板形成一个准直单元，该射线经过每个准直单元后照射在极片100上的区域在宽度方向X上的尺寸为S1。
在一种实现方式中，如图7所示，放射源的线束截面在宽度方向X和长度方向Y上的尺寸分别为W1和L1，W1可以基于待测极片的宽度进行选取，L1可以基于所需的检测精度进行选取。例如，20mm≤L1≤50mm，和/或，200mm≤W1≤1500mm，该尺寸能够满足对大多数尺寸的极片的检测需求。
在一种实现方式中，如图7和图8所示，第一准直器213的多个挡板中每个挡板在宽度方向X上的尺寸、以及在厚度方向Z上的尺寸分别为d和H1，其中，0.2mm≤d≤1mm，和/或，1mm≤H1≤5mm。d和H1位于该范围时，即保证了第一准直器213的结构稳定性，也保证了对射线的有效引导，能够获得最佳的检测效果。
在一种实现方式中，在宽度方向X上，第一准直器213的多个挡板中第一个挡板和最后一个挡板，均与开窗2121的边缘之间间隔d/2；和/或，在长度方向Y上，第 一准直器213的多个挡板的两个端部均与开窗2121的边缘之间间隔d/2。从而充分利用第一准直器213对从第一壳体211上的开窗2121出来的射线进行准直。
在一种实现方式中，如图9和图10所示，探测机构220包括第二壳体221和探测器阵列，探测器阵列包括M行×N列个探测器222，M行探测器沿宽度方向X设置，N列探测器沿长度方向Y设置，M和N为正整数。探测器阵列设置在第二壳体221朝向放射机构210一侧的壁2211上。M行×N列个探测单元具有各自的探测区域，每个探测单元用于检测极片100上的对应区域透射出来的信号。由多个探测器222的探测器阵列设置于第二壳体221朝向放射机构210一侧的壁2211上，第二壳体221可以形成对探测器222的支撑和保护。
探测器阵列中的探测器222的数量越多，检测精度越高，但是成本和结构复杂度也越高。本申请实施例中，N的范围例如可以是1≤N≤10，优选地为3或者5；M的范围例如可以是5≤M≤150，优选地为20或80。当极片100宽度方向X和长度方向Y上的探测器数量位于该范围时，即保证了检测精度，也不会带来额外的成本和结构复杂度。
在一种实现方式中，如图9和图10所示，探测机构220还包括第二准直器224，第二准直器224设置在极片100和探测器阵列之间，用于对从极片100透射的信号进行准直。从极片100透射的信号的方向会发生改变，第二准直器224中的每个准直单元能够将极片100上对应区域透过的射线引导至对应的探测器222，从而对极片100的宽度方向上的各个区域进行有效检测。
第二准直器224例如可以由多个挡板组成，多个挡板沿宽度方向X设置且垂直于极片100的表面。通过多个挡板形成多个准直单元，结构简单，且能够有效地将极片100透过的信号引导至对应的探测器222上。该挡板为薄片状，也可以称为分割片。
图8中还示出了探测机构220和极片100之间的由多个挡板形成的第二准直器224。如图8所示，多个挡板中相邻两个挡板形成一个准直单元，多个准直单元分别对应探测器阵列中的多个探测器222，极片100透射的信号经过每个准直单元后，被对应的探测器222接收。也就是说，多个准直单元将极片110的多个区域透过的信号，分别引导至对应的多个探测器222，多个探测器222分别用于检测极片100的多个区域透过的信号。每个准直单元可以过滤其对应的探测器的检测区别之外的其他区域透射的信号。该检测区域在宽度方向X上的尺寸为S2，相邻探测器222对应的检测区域之间可 以重叠也可以不重叠。
经过第二准直器224，每个探测器222接收到其检测区域透过的信号，每个探测器222把信号强度转换为微弱的电流信号，采用多通道并行的计算方式，将每个探测器222输出的电流信号输入如放大器，以将其转换为高信噪比的电压信号，该电压信号通过模数转换后得到对应的数字信号，即可得到穿过极片100表面的被测材料后的射线强度I。
探测器阵列中相邻两个探测器222之间的间距为d，0.2mm≤d≤1mm。相邻两个探测器222之间的间距与第一准直器219的挡板的厚度相等，能够充分利用每个探测器的感应区域，有效地接收从第一准直器210透过的射线，提高了信号接收效率。
根据第二准直器224中相邻两个挡板之间的距离，与第一准直器213中相邻两个挡板之间的距离之间的关系，或者说是第二准直器224的挡板数量与第一准直器213的挡板数量之间的关系，来平衡探测器222的数量和检测精度。例如，如图8所示，第二准直器224的多个挡板中相邻两个挡板之间的距离，为第一准直器213的多个挡板中相邻两个挡板之间的距离的两倍。
如图10所示，探测器阵列中每个探测器222的信号接收窗口在宽度方向X和长度方向Y上的尺寸分别为W2和L2。其中，W2的范围例如可以是1mm≤W2≤20mm，优选地，W2为10mm；L2的范围例如可以是1mm≤L2≤40mm，优选地，L2为10mm。探测器222的尺寸越小，检测精细度越高，但对于相同检测面积而言也增加了探测器222的数量，当探测器222的尺寸位于该范围时，能够兼顾检测精细度和探测器的数量。这时，第一准直器213的相邻两个挡板形成的准直单元的出射窗口的面积为(W1-d)×[(L2-d)/2]。第二准直器224的相邻两个挡板形成的出射窗口的面积(W1-d)×L2。
探测器阵列的接收窗口尺寸与放射源的射线出射窗口尺寸相同，均为(W1-d)×(L1-d)。其中，W1＝(W2+d)×N，L1＝(L2+d)×M。这里，放射源的射线出射窗口的尺寸为第一准直器的尺寸。
在一种实现方式中，如图8和图10所示，第二准直器224的多个挡板中每个挡板在宽度方向X上的尺寸、以及在厚度方向Z上的尺寸分别为d和H2，其中，0.2mm≤d≤1mm，和/或，1mm≤H2≤5mm。d和H2位于该范围时，即保证了第二准直器224的结构稳定性，也保证了对透射信号的有效引导，能够获得最佳的检测效果。
以下，一并结合图11至图13详细描述本申请实施例的涂布机构240。其中，图11和图12示出了本申请实施例的涂布机构240中的涂布模头241及其调节部244的结构，图13为图12中区域A的放大图，图13示出了调节部224中的调节块2241与材料接触的部分的尺寸。从上述图2至图4可以看出，涂布机构240包括涂布辊242和M个涂布模头241，涂布辊242用于承载极片100，M个涂布模头241沿宽度方向X设置，且位于涂布辊242远离支架230的一侧，M个涂布模头241分别连接M个出料口243，每个涂布模头241用于将材料输送至对应的出料口243，以使该材料通过出料口243涂布在极片100的表面。
M个涂布模头241分别对应于探测机构220的探测器阵列中的M行探测器，由于在宽度方向X上设置有与M个探测器对应的M个涂布模头，M个涂布模头在极片100上涂布的材料量可以分别根据M个探测器的检测结果进行闭环调节，提升了涂布一致性。
在一种实现方式中，如图11和图12所示，涂布机构200还包括与M个涂布模头241对应设置的M个调节部244，每个调节部244用于根据对应的探测器222检测的面密度，调整对应的涂布模头241连接的出料口243的尺寸。由于M个出料口243的尺寸分别由M个调节部244控制，M个调节部244可以分别根据M个探测器222的检测结果控制M个出料口243的尺寸，实现对极片100的面密度值的闭环自动调整，提升了极片100的宽度方向X上的涂布一致性。
在一种实现方式中，如图11和图12所示，调节部244包括调节块2441及其驱动装置2442，驱动装置2442用于驱动调节块2441沿厚度方向Z运动，以通过调节块2441调整对应的涂布模头241连接的出料口243的尺寸。利用驱动块2441及其驱动装置2442来实现对出料口243的调节，结构简单且准确性高。驱动装置2442例如可以是电机。
此外，调节部244还包括转换滑块2444和固定座2445等。图12所示的状态下，调节块2441处于高位，出料口243的尺寸最大，驱动装置2442的轴与转换滑块2444之间可以采用高精密螺纹链接，驱动装置2442旋转一定角度，转换滑块2444会沿着固定座2445滑动，即通过高精密螺纹将旋转运动转换为直线运动，转换滑块2444与调节块2441的连杆采用螺纹固定，调节块2441顺着转换滑块2444一起上下运动，达到调节出料口243的尺寸的目的。
在一种实现方式中，调节块2441与材料接触的部分在宽度方向X和长度方向Y上的尺寸分别为W3和L3。其中，W3的范围例如可以是10mm≤W3≤30mm，优选地，W3＝10mm；L3的范围例如可以是5mm≤L3≤20mm，优选地，L3＝20mm。通过合理设置调节块2441与材料接触的区域的尺寸，能够在满足涂布均匀性的要求的同时，减少调节块2441的数量。调节块2441可以为矩形、菱形或者阶梯型等。
L3通常大于或等于L2，优选地，L3为L2的整数倍，L2为探测器阵列中每个探测器222的信号接收窗口在长度方向Y上的尺寸。L3为L2的整数倍时，对出料口243的调节量与探测器的信号接收窗口相匹配，便于根据探测器222的检测结果对出料口243的尺寸进行反馈调整。
驱动装置2442在厚度方向Z上的移动距离例如小于或等于200mm。该移动距离与出料口243在厚度方向Z上的尺寸对应，当其位于上述范围时，既满足了涂布后的极片100面密度的变化范围，也减少了所占用的空间位置。
可见，本申请实施例提供的极片检测的设备200可以在极片100的涂布过程中对极片100的面密度进行实时的全区域检测。极片100从涂布辊260的辊面经过的同时，出料口243输出的浆料被涂布在极片100的表面，然后极片100运动至放射机构210和探测机构220之间时，放射机构210覆盖极片100的宽度方向X，以获得极片100沿宽度方向X上的二维检测数据。根据该检测数据，可以通过调节部224对出料口243的尺寸进行反馈调整，以提高极片100表面沿宽度方向X上的面密度的一致性。驱动装置2442通过控制调节块2441的上下高度，利用调节块2441的上下移动改变对应的出料口243的尺寸。出料口243的尺寸变小，浆料流量变小，极片100的涂布重量变小，相应位置的面密度变小；出料口243的尺寸变大，浆料流量变大，极片100的涂布重量变大，相应位置的面密度变大。这样，便可以对极片100的局部区域的面密度进行调整。
需要说明的是，在不冲突的前提下，本申请描述的各个实施例和/或各个实施例中的技术特征可以任意的相互组合，组合之后得到的技术方案也应落入本申请的保护范围。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。 专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考上述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。

Claims (29)

  1. 一种极片检测的设备，其特征在于，所述设备包括：
    放射机构，所述放射机构用于向极片发出射线，所述射线沿所述极片的宽度方向设置并覆盖所述极片，且沿所述极片的长度方向对所述极片进行扫描；以及，
    探测机构，所述探测机构和所述放射机构相对设置在所述极片的两侧，所述探测机构用于检测从所述极片透射的信号，所述信号用于检测所述极片的表面涂布的材料的面密度。
  2. 根据权利要求1所述的设备，其特征在于，所述设备还包括支架，所述支架上设置有窗口，所述窗口垂直于所述长度方向，所述探测机构和所述放射机构分别固定在所述窗口上相对的两个边缘且具有间隔，以使所述极片经由所述间隔从所述放射机构和所述探测机构之间穿过。
  3. 根据权利要求2所述的设备，其特征在于，所述支架的材料为大理石。
  4. 根据权利要求1至3中任一项所述的设备，其特征在于，所述放射机构包括：
    放射源，用于产生所述射线；以及，
    第一壳体，所述第一壳体用于容纳所述放射源，所述第一壳体朝向所述探测机构一侧的表面设置有开窗，所述开窗用于透过所述射线。
  5. 根据权利要求4所述的设备，其特征在于，所述放射机构还包括：
    第一准直器，所述第一准直器设置在所述放射源和所述极片之间，用于对所述放射源发出的所述射线进行准直。
  6. 根据权利要求5所述的设备，其特征在于，所述第一准直器包括多个挡板，所述多个挡板沿所述宽度方向设置且垂直于所述极片的表面。
  7. 根据权利要求4至6中任一项所述的设备，其特征在于，所述放射源的线束截面在所述宽度方向和所述长度方向上的尺寸分别为W1和L1，其中，20mm≤L1≤50mm，和/或，200mm≤W1≤1500mm。
  8. 根据权利要求4至7中任一项所述的设备，其特征在于，所述第一准直器的多个挡板中每个挡板在所述宽度方向上的尺寸、以及在所述极片的厚度方向上的尺寸分别为d和H1，其中，0.2mm≤d≤1mm，和/或，1mm≤H1≤5mm。
  9. 根据权利要求8所述的设备，其特征在于，在所述宽度方向上，所述多个挡板 中第一个挡板和最后一个挡板，均与所述开窗的边缘之间间隔d/2；和/或，在所述长度方向上，所述多个挡板的两个端部均与所述开窗的边缘之间间隔d/2。
  10. 根据权利要求4至9中任一项所述的设备，其特征在于，所述探测机构包括：
    探测器阵列，所述探测器阵列包括M行×N列个探测器，所述M行探测器沿所述宽度方向设置，所述N列探测器沿所述长度方向设置，M和N为正整数；
    第二壳体，探测器阵列设置在所述第二壳体朝向放射机构一侧的壁上。
  11. 根据权利要求10所述的设备，其特征在于，1≤N≤10，和/或，5≤M≤150。
  12. 根据权利要求10或11所述的设备，其特征在于，所述探测器阵列中相邻两个探测器之间的间距为d，0.2mm≤d≤1mm。
  13. 根据权利要求10至12中任一项所述的设备，其特征在于，所述探测机构还包括：
    第二准直器，所述第二准直器设置在所述极片和所述探测器阵列之间，用于对从所述极片透射的信号进行准直。
  14. 根据权利要求13所述的设备，其特征在于，所述第二准直器包括多个挡板，所述多个挡板沿所述宽度方向设置且垂直于所述极片的表面。
  15. 根据权利要求14所述的设备，其特征在于，所述第二准直器的多个挡板中相邻两个挡板之间的距离，为第一准直器的多个挡板中相邻两个挡板之间的距离的两倍。
  16. 根据权利要求10至15中任一项所述的设备，其特征在于，所述探测器阵列中每个探测器的信号接收窗口在所述宽度方向和所述长度方向上的尺寸分别为W2和L2，其中，1mm≤W2≤20mm，和/或，1mm≤L2≤40mm。
  17. 根据权利要求10至16中任一项所述的设备，其特征在于，所述第二准直器的多个挡板中每个挡板在所述宽度方向上的尺寸、以及在所述极片的厚度方向上的尺寸分别为d和H2，其中，0.2mm≤d≤1mm，和/或，1mm≤H2≤5mm。
  18. 根据权利要求1至17中任一项所述的设备，其特征在于，在所述极片的厚度方向上，所述探测机构和所述放射机构之间的距离小于或等于15mm。
  19. 根据权利要求1至18中任一项所述的设备，其特征在于，所述设备还包括涂布机构，所述涂布机构用于向所述极片的表面涂布所述材料。
  20. 根据权利要求19所述的设备，其特征在于，所述涂布机构包括：
    涂布辊，用于承载所述极片；
    M个涂布模头，所述M个涂布模头沿所述宽度方向设置，且位于所述涂布辊远离所述支架的一侧，所述M个涂布模头分别连接M个出料口，所述涂布模头用于将所述材料输送至对应的所述出料口，以使所述材料通过所述出料口涂布在所述极片的表面。
  21. 根据权利要求20所述的设备，其特征在于，所述M个涂布模头分别对应于所述探测机构的探测器阵列中的M行探测器，所述涂布机构还包括：
    M个调节部，与所述M个涂布模头对应设置，所述调节部用于根据对应的所述探测器检测的面密度，调整对应的所述涂布模头连接的所述出料口的尺寸。
  22. 根据权利要求21所述的设备，其特征在于，所述调节部包括调节块及其驱动装置，所述驱动装置用于驱动所述调节块沿所述极片的厚度方向运动，以通过所述调节块调整对应的所述涂布模头连接的所述出料口的尺寸。
  23. 根据权利要求22所述的设备，其特征在于，所述调节块与所述材料接触的部分在所述宽度方向和所述长度方向上的尺寸分别为W3和L3，其中，10mm≤W3≤30mm，和/或，5mm≤L3≤20mm。
  24. 根据权利要求23所述的设备，其特征在于，L3为L2的整数倍，L2为探测器阵列中每个探测器的信号接收窗口在所述长度方向上的尺寸。
  25. 根据权利要求22至24中任一项所述的设备，其特征在于，所述驱动装置在所述极片的厚度方向上的移动距离小于或等于200mm。
  26. 根据权利要求1至25中任一项所述的设备，其特征在于，所述设备还包括第一过辊和第二过辊，所述第一过辊和所述第二过辊分别设置在所述支架沿所述长度方向的两侧，所述第一过辊和所述第二过辊用于承载所述极片。
  27. 根据权利要求26所述的设备，其特征在于，所述第一过辊和所述第二过辊之间的距离小于或等于800mm。
  28. 根据权利要求1至27中任一项所述的设备，其特征在于，所述射线为X射线或者β射线。
  29. 根据权利要求28所述的设备，其特征在于，所述X射线的功率的范围为200mci至5000mci，和/或，所述β射线的功率的范围为12w至20kw。
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CN1962102A (zh) * 2006-11-22 2007-05-16 苏州有色金属加工研究院 X射线凸度测量仪
CN1991345A (zh) * 2005-12-29 2007-07-04 比亚迪股份有限公司 一种电池极片面密度测量系统和方法
CN102698921A (zh) * 2012-01-12 2012-10-03 宁德新能源科技有限公司 一种涂布装置
CN107582089A (zh) * 2017-09-29 2018-01-16 上海联影医疗科技有限公司 准直器、成像设备、焦点位置跟踪方法及校正方法
CN109225766A (zh) * 2018-09-25 2019-01-18 深圳市浩能科技有限公司 一种极片的测厚方法
CN109550642A (zh) * 2017-09-26 2019-04-02 东莞市雅康精密机械有限公司 锂离子电池极片的涂布模头和涂布机

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CN1991345A (zh) * 2005-12-29 2007-07-04 比亚迪股份有限公司 一种电池极片面密度测量系统和方法
CN1962102A (zh) * 2006-11-22 2007-05-16 苏州有色金属加工研究院 X射线凸度测量仪
CN102698921A (zh) * 2012-01-12 2012-10-03 宁德新能源科技有限公司 一种涂布装置
CN109550642A (zh) * 2017-09-26 2019-04-02 东莞市雅康精密机械有限公司 锂离子电池极片的涂布模头和涂布机
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