CN115646761A - Coating surface density online detection method and device and battery coating equipment - Google Patents
Coating surface density online detection method and device and battery coating equipment Download PDFInfo
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Abstract
The application provides an online detection method and device for coating surface density and battery coating equipment. The online detection method of the coating surface density is applied to a battery coating machine and comprises the following steps: s1, acquiring the initial time t 0 To the current time t 1 Introducing the pole piece coating area of the pole roll; s2, respectively obtaining initial time t 0 Initial pole roll weight M 0 And the current time t 1 Current pole roll weight M 1 (ii) a S3, according to the initial pole roll weight M 0 Current pole roll weight M 1 And calculating the coating surface density according to the coating area of the pole piece. According to the online detection method of the coating surface density, the online detection of the coating surface density can be realized without stopping sampling, and in the detection process, the coating surface density can be calculated by acquiring the weight of the initial moment and the current moment and the coating area of the pole piece introduced into the pole rollAnd the safety and the detection efficiency of the online detection of the coating surface density are improved.
Description
Technical Field
The invention relates to the field of coating, in particular to a coating surface density online detection method and device and battery coating equipment.
Background
The lithium battery has the advantages of high energy density, long service life, environmental protection and the like, so that the lithium battery is increasingly used. In the production process of the lithium battery, the quality of coating directly determines the quality of the battery, and the quality of coating is directly influenced by the density of the coated surface. Therefore, it is required to check the coating surface density in the lithium battery production process to control the coating quality.
In the prior art, two methods are generally used for measuring the coating surface density, one method is to take materials when a coating machine is stopped, measure the weight of the materials and calculate the surface density; the other method is to arrange an X/beta ray surface density measuring instrument at the tail of the coating machine, the intensity attenuation can occur when the X/beta ray penetrates through the coating pole piece, and the attenuation accords with an exponential law and is related to the coating surface density, so that the measurement of the coating surface density can be realized according to the attenuation of the detection ray. However, both the two methods have certain disadvantages, the former method needs to take materials in a shutdown state, which affects the production efficiency on one hand, and on the other hand, the single winding core is scrapped when the material taking position is rewound, which affects the straight-through rate of the product; the latter needs to be accurately measured in a windless environment or under the condition that the foil does not shake, and the device can release X/beta rays in the measuring process, so that the device is harmful to human bodies and the environment.
Disclosure of Invention
In view of this, the present invention provides an on-line detection method for coating surface density, which can realize on-line detection.
The invention also provides a device for online detection of the coating surface density.
The invention also provides a battery coating device.
The online detection method for the coating surface density according to the embodiment of the first aspect of the invention is applied to a battery coating machine and comprises the following steps:
s1, acquiring the initial time t 0 To the current time t 1 Introducing the pole piece coating area of the pole roll;
s2, respectively obtaining initial time t 0 Initial pole roll weight M 0 And the current time t 1 Current pole roll weight M 1 ；
S3, according to the initial pole roll weight M 0 Current pole roll weight M 1 And calculating the coating surface density according to the coating area of the pole piece.
Further, the step S1 includes:
determining the winding speed V;
based on the initial time t 0 To the current time t 1 Determining a time interval delta t;
obtaining a coating width L;
determining a pole piece coating area S corresponding to the time interval delta t according to the following formula 1) based on the winding speed V, the time interval delta t and the coating width L,
S＝V*⊿t*L 1)。
further, the step S3 includes:
s31, based on the initial pole roll weight M 0 Current pole roll weight M 1 Determining a pole roll weight difference Δ M corresponding to said time interval Δ t, wherein Δ M = M 1 -M 0 ；
S32, acquiring winding tension F, and determining a first weight change correction amount delta m based on the winding tension F 1 ；
S33, varying the pole roll weight Δ M and the first weight variation correction amount Δ M based on the pole roll weight Δ M and the first weight variation correction amount Δ M 1 Obtaining a corrected weight difference delta M';
s34, calculating the density rho of the coating surface based on the corrected weight difference delta M' and the coating area S of the pole piece m Where ρ is m ＝⊿M’/S。
Further, the step S32 includes:
s321, acquiring the winding tension F;
s322, obtaining the initial time t 0 Radius of pole roll R 0 And the current time t 1 Radius of pole roll R 1 ；
S323, according to the radius R of the pole roll 1 And R 0 Determining said initial time t between the lead-in portion of the pole roll and the horizontal plane, respectively, by means of an angle determination model 0 Initial included angle theta of 0 Current angle theta to the current time 1 ；
S324, according to the winding tension F and the output included angle theta 0 Current angle of inclusion theta 1 Determining said first weight variation correction amount Δ m 1 Wherein the first weight variation correction amount Δ m 1 ＝F(sinθ 1 -sinθ 0 ) And g, wherein g is the acceleration of gravity.
Further, the angle determination model is determined by:
respectively obtaining the radiuses of the calibrated pole rolls at a plurality of different moments and the calibrated included angles between the lead-in parts of the corresponding pole rolls and the horizontal plane;
and obtaining the angle determination model according to the plurality of calibrated polar roll radii and the calibrated included angles.
Further, the step S3 may further include:
s35, determining the initial time t 0 To the current time t 1 A second weight variation correction Δ m of the substrate of the pole piece introduced into the pole roll 2 (vii) Δ t Δ = ρ × V ×, wherein l is the width of the base material and ρ is the areal density of the base material;
wherein, in said step S33, said pole roll weight variation Δ M, said first weight variation correction amount Δ M 1 And a second weight change correction amount (delta m) 2 Obtaining the corrected weight difference delta M' =deltaM + delta M 1 -⊿m 2 。
Further, when the Δ t is less than a predetermined value, the coating areal density ρ is determined by the following equation 2) m ：
ρ m ＝[(⊿M-⊿m 2 ]/(V*⊿t*L) 2)。
The coating surface density on-line detection device according to the embodiment of the second aspect of the invention is applied to a battery coating machine and comprises:
the weighing unit is arranged below the winding device of the battery coating machine and used for weighing the pole roll weight of the pole roll;
and the calculating unit is used for calculating the coating surface density according to the coating speed, the coating width and the difference of the pole roll weight at different moments.
Further, the coating surface density on-line detection device further comprises:
a thickness detection unit for detecting a radius of the pole roll;
the calculation unit determines an included angle between the leading-in part of the polar roll and a horizontal plane according to the radius through an angle determination model, determines a first weight correction value based on the included angle and the winding tension, corrects the weight difference of the polar roll according to the first weight correction value, and calculates the coating surface density.
Further, the coating surface density online detection device of the embodiment of the present invention may further include:
and the early warning unit receives the coating surface density calculated by the calculating unit and gives out early warning when the coating surface density exceeds a preset threshold range.
According to a third aspect embodiment of the invention, a battery coating apparatus comprises:
a battery coating machine; and
the device for online detection of the coating surface density according to any one of the above.
The technical scheme of the invention has at least one of the following beneficial effects:
according to the online detection method of the coating surface density, the coating surface density is detected from the initial time t 0 To the current time t 1 The area S of the pole piece coating of the incoming pole roll and the initial time t 0 Initial pole roll weight M 0 And the current time t 1 Current pole roll weight M 1 And calculating the coating surface density. Since the pole piece coating area S can be determined by the winding speed and the coating width,and the weight of the pole roll can be obtained by on-line detection, so that the on-line detection method of the coating surface density can realize the on-line detection of the coating surface density without stopping sampling, and the safety and the detection efficiency of the on-line detection of the coating surface density are improved.
Drawings
FIG. 1 is a schematic structural diagram of a pole piece leading-in pole roll at the tail of a coater;
fig. 2 is a schematic diagram of the principle of weight correction based on tension.
Reference numerals: 100. pole winding; 110. a lead-in section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
First, the method for on-line detection of the coating areal density according to the embodiment of the first aspect of the invention will be specifically described.
The online detection method of the coating surface density is applied to a battery coating machine.
According to some embodiments of the invention, the method for online detection of coating areal density comprises the steps of:
s1, acquiring the initial time t 0 To the current time t 1 Introducing a pole piece coating area S of the pole roll;
s2, respectively obtaining initial time t 0 Initial pole roll weight M 0 And the current time t 1 Current pole roll weight M 1 ；
S3, according to the initial pole roll weight M 0 Current pole roll weight M 1 And calculating the coating surface density according to the coating area of the pole piece.
That is, by acquiring the weight M at the initial time 0 And the weight M of the current time 1 And the coating surface density can be calculated by introducing the coating area of the pole piece of the pole roll, so that the safety and the detection efficiency of online detection of the coating surface density can be improved.
The coating area S of the pole piece can be determined by the winding speed and the coating width without stopping for detection; in addition, the weight of the pole roll can be detected on line without stopping detection. Therefore, the online detection method for the coating surface density can realize online detection of the coating surface density without stopping sampling, does not depend on X/beta ray surface density measuring equipment in the detection process, and has the advantages of good safety and high detection efficiency.
In some embodiments, step S1 comprises: determining a winding speed V; based on the initial time t 0 To the current time t 1 Determining a time interval delta t; acquiring a coating width L; determining a pole piece coating area S corresponding to the time interval delta t according to the following formula 1) based on the winding speed V, the time interval delta t and the coating width L,
S＝V*⊿t*L 1)。
as for the winding speed V, it is uniquely determined by the winding mechanism, which normally performs winding at a constant speed. The winding speed can be obtained from the winding mechanism.
Further, as for the coating width L, it is uniquely determined by the coater, and in general, it is constant.
That is, as long as the time interval Δ t (i.e., Δ t = t) is determined 1 -t 0 ) The length of the pole piece, i.e., V Δ t, during the period of time can be determined, and the pole piece coating area S introduced into the pole roll 100 during the period of time can be obtained by combining the width of the pole piece, i.e., the coating width L. The method is used for measuring and calculating the coating area S of the pole piece, the machine halt detection is not needed, and the convenience and the efficiency of the online detection of the coating surface density can be improved.
In order to obtain the initial pole roll weight M 0 With the current pole roll weight M 1 For example, the pole roll can be lowered by a weighing cell at an initial point in time t 0 To the current time t 1 Directly weighing.
After determining the coating area S of the pole piece and the weight M of the initial pole roll 0 With the current pole roll weight M 1 Thereafter, the coating areal density can be calculated.
For example, in the case of a short time interval, the weight error due to the tension applied to the pole roll, and also the weight error introduced by the base material of the pole piece, can be ignored, in which case (M) is then possible 1 -M 0 ) The coating areal density was estimated as/S.
In some embodiments, step S3 comprises:
s31, based on the initial pole roll weight M 0 Current pole roll weight M 1 Determining a pole roll weight difference Δ M corresponding to the time interval Δ t, wherein Δ M = M 1 -M 0 ；
S32, acquiring the winding tension F, and determining a first weight change correction amount delta m based on the winding tension F 1 ；
S33, based on the pole roll weight variation Δ M and the first weight variation correction amount Δ M 1 Obtaining the corrected weight difference (delta M';
s34, calculating the density rho of the coating surface based on the corrected weight difference delta M' and the coating area S of the pole piece m Where ρ is m ＝⊿M’/S。
That is, in the present embodiment, the pole roll weight deviation due to the winding tension F is corrected.
Specifically, by weighing the initial time t 0 Initial pole roll weight M of time pole roll 100 0 And the current time t 1 Current pole roll weight M 1 Obtaining a pole roll weight difference (delta M = M) in a time period (delta t) 1 -M 0 . Further, since the lead-in portion 110 of the pole roll 100 is subjected to the take-up tension F, which is one of the causes of the weight deviation, at the time of on-line weighing, and the component of the take-up tension F in the vertical direction is determined based on the take-up tension F, the first weight variation correction amount Δ m is determined 1 And finally calculating the density rho of the coating surface based on the corrected weight difference delta M' and the coating area S of the pole piece m = Δ M'/S. By correcting the pole roll weight difference in the Δ t period, the detection accuracy of the coating surface density can be improved.
As shown in fig. 2, the winding tension F is generally constant. The winding tension F acts in the direction of the web winding, so that the winding tension F can be divided into horizontal components F 2 And a component F in the vertical direction 1 In which the component F in the vertical direction 1 Is the cause of the weight error. For this reason, only the component F in the vertical direction is confirmed 1 The first weight variation correction amount delta m generated by the winding tension F can be obtained 1 . For example, the pushing force F in the horizontal direction loaded on the winding mechanism can be detected 2 Calculating F by combining the winding tension F 1 And so on.
In one embodiment, the radius of the pole roll is determined and the angle θ is determined by mapping the angle θ between the lead-in 110 and the horizontal plane to the radius of the pole roll, thereby obtaining the vertical component F 1 From this, a first weight variation correction amount [ delta ] m is determined 1 。
Next, the first weight variation correction amount Δ m will be described in detail with reference to fig. 2 1 The determination process of (1).
In some embodiments, step S32 comprises:
and S321, acquiring winding tension F.
The winding tension F is a constant value, and is usually a set value, and it is sufficient to directly read the tension from the winding device.
S322, obtaining the initial time t 0 Radius of pole roll R 0 And the current time t 1 Radius of pole roll R 1 。
Specifically, it may be measured by, for example, a thickness detection device, a distance detection sensor, or the like.
In some embodiments, the pole roll radius may be determined, for example, by detecting the distance between the center of the pole roll and the edge of the pole roll through a grating.
S323, according to the radius R of the pole roll 1 And R 0 Determining the initial time t between the lead-in portion 110 of the pole roll 100 and the horizontal plane, respectively, by means of an angle determination model 0 Initial included angle theta of 0 And the current angle theta at the current moment 1 。
In fact, as shown in fig. 2, the radius R of the pole roll has a one-to-one correspondence relationship with the included angle θ, and the radius of the pole roll can be converted into the included angle θ by the angle determination model as long as the mapping relationship, i.e., the angle determination model, is determined in advance.
In some embodiments of the present application, the angle determination model is determined by: respectively obtaining the radiuses of the calibrated pole rolls at a plurality of different moments and the corresponding calibration included angles between the leading-in parts 110 of the pole rolls 100 and the horizontal plane; and obtaining an angle determination model according to the radius of the plurality of calibration polar rolls and the calibration included angle. That is, as shown in fig. 2, the change of the radius R of the pole roll causes the change of the included angle θ between the leading portion 110 of the pole roll 100 and the horizontal plane, so that the angle determination model can be established by obtaining the functional relationship between the radius R of the pole roll and the included angle θ between the leading portion 110 of the pole roll 100 and the horizontal plane through different calibrated pole roll radii of the vehicles and the corresponding calibrated included angles between the leading portion 110 and the horizontal plane, i.e. by fitting.
It should be noted that the angle determination model may be a continuous function or a discrete function, where the continuous function may obtain a more accurate value, and the discrete function may reduce workload. Continuous or discrete functions may be selected as appropriate for specific accuracy requirements.
S324, according to the winding tension F and the output included angle theta 0 Current angle of inclusion theta 1 Determining a first weight variation correction amount (delta m) 1 Wherein the first weight variation correction amount Δ m 1 ＝F(sinθ 1 -sinθ 0 ) And g, wherein g is the acceleration of gravity.
That is, based on the angle determination model, i.e., the mapping relationship between the radius of the pole roll and the included angle, the measured initial time t can be determined 0 Radius of pole wrap R 0 And the current time t 1 Radius of pole wrap R 1 Initial time t between the lead-in portion 110 converted into a pole roll 100 and the horizontal plane 0 Initial included angle theta of 0 Current angle theta to the current time 1 And then the initial time t can be obtained by calculation 0 With the current time t 1 Component F of the winding tension F in the vertical direction 1 (i.e., the first weight variation correction amount Δ m) 1 ). Component F of winding tension F in vertical direction 1 = F sin θ, so it is possible to use the formula Δ m 1 ＝F(sinθ 1 -sinθ 0 ) Calculating a first weight change correction amount Δ m in a time period Δ t 1 。
In the method for detecting the density of the coating surface on line, which is disclosed by the embodiment of the invention, based on an angle determination model obtained by calibration, an included angle theta between an introduction part 110 of a pole roll 100 and a horizontal plane at a certain moment can be quickly obtained by obtaining the radius of the pole roll at the moment, and then a first weight change correction amount delta m in a delta t time period is obtained 1 And the online detection efficiency of the coating surface density can be further improved.
In addition, the introduction portion 110 includes a pole piece, i.e., a coating layer, and a substrate carrying the coating layer. The weight of the substrate is also included in the measured weight of the pole roll. If the time interval is sufficiently small, it can be ignored, but in order to improve the calculation accuracy, it is necessary to correct the weight for the substrate portion.
In some embodiments of the present application, S3 further comprises:
s35, determining the initial time t 0 To the current time t 1 A second weight variation correction Δ m of the substrate of the pole piece introduced into the pole roll 100 2 = ρ × V Δ t Δ l, where l is the width of the substrate and ρ is the areal density of the substrate; in step S33, the control unit determines the pole roll weight variation Δ M based on the pole roll weight variation Δ M and the first weight variation correction amount Δ M 1 And a second weight change correction amount (delta m) 2 Obtaining the corrected weight difference delta M' =deltaM + delta M 1 -⊿m 2 。
That is, the second weight variation correction Δ m with the weight of the base material corresponding to the pole piece introduced into the pole roll 100 as the weight difference in the Δ t period is also required 2 To obtain a corrected weight difference. The method specifically comprises the following steps: the length of the substrate corresponding to the pole piece introduced into the pole roll 100 is V Δ t, where V represents the winding speed, and the area of the substrate corresponding to the pole piece introduced into the pole roll 100 is V Δ t, where l is the width of the substrate, such that the weight Δ m of the substrate corresponding to the pole piece introduced into the pole roll 100 is 2 And = ρ × V Δ t Δ l, where ρ is the areal density of the substrate. A second weight change correction amount Δ m of the weight difference in the calculated period of time Δ t 2 In conjunction with the first weight variation correction amount Δ m in step S33 1 The weight difference Δ M' =Δm +/Δ M after the correction in the time period Δ t may be further obtained 1 -⊿m 2 . That is, the second weight variation correction Δ m by calculating the base material of the pole piece introduced into the pole roll 100 2 And correcting the weight difference in the time period of delta t, and further improving the detection precision of the density of the coating surface.
Further, when Δ t is smaller than the predetermined value, the coating areal density ρ is determined by the following equation 2) m ：ρ m ＝[(⊿M-⊿m 2 ]V Δ t Δ L. That is, when Δ t is smaller than a predetermined value, that is, the predetermined value should be taken in a period of time Δ t, the amount of change in the radius of the pole roll 100 is small, and the amount of change in the angle θ between the lead-in portion 110 of the pole roll 100 and the horizontal plane is also small, so that the amount of change in the component of the winding tension F in the vertical direction is smallIs also small, and thus the first weight variation correction amount (Δ m) 1 ＝F(sinθ 1 -sinθ 0 ) The/g is negligible. In other words, the corrected weight difference in the period Δ t is Δ M- ρ Δ V Δ t, i.e. Δ M- Δ M 2 . That is, the coating surface density is detected in a short time, and the change of the component of the winding tension F in the vertical direction due to the change of the radius of the pole roll 100 can be ignored, so that the calculation is simplified, and the online detection efficiency of the coating surface density can be further improved.
The coating surface density online detection device is applied to a battery coater and comprises a weighing unit and a calculating unit, wherein the weighing unit is arranged below a winding device of the battery coater to weigh the pole roll weight of the pole roll 100; the calculating unit determines the coating surface density according to the coating speed, the coating width and the difference of the pole roll weight at different moments. That is to say, when the coating surface density on-line detection device performs on-line detection of the coating surface density, the weighing unit can firstly obtain the initial time t 0 Initial pole roll weight M 0 And the current time t 1 Current pole roll weight M 1 Thereafter, the difference Δ M = M in terms of coating speed, coating width, and pole roll weight at different moments in time is calculated by a calculation unit 1 -M 0 And determining the coating surface density.
The coating surface density online detection device provided by the embodiment of the invention can realize online detection of the coating surface density without stopping and sampling equipment, and the like, and detection equipment with radiation, such as an X/beta ray surface density measuring instrument and the like, is not needed in the detection process, and has the advantage of high safety.
Further, the coating surface density on-line detection device further comprises a thickness detection unit, the thickness detection unit is used for detecting the radius of the polar roll 100, the calculation unit determines an included angle between the leading-in part 110 of the polar roll 100 and the horizontal plane according to the radius through an angle determination model, determines a first weight correction value based on the included angle and the winding tension, and calculates the coating surface density after correcting the difference of the polar roll weight according to the first weight correction value. That is, to ensureDetermining a first weight correction amount (Δ m) 1 First, the initial time t is detected by the weight correction unit 0 Radius of pole roll R 0 And the current time t 1 Radius of pole roll R 1 Then, the calculation unit determines the model through the angle according to the initial time t 0 Radius of pole wrap R 0 And the current time t 1 Radius of pole roll R 1 Respectively determining an initial time t 0 And current time t 1 The angle θ between the lead-in portion 110 of the bottom pole roll 100 and the horizontal plane 0 And theta 1 Thereby obtaining a first weight correction amount (delta m) 1 ＝F(sinθ 1 -sinθ 0 ) The coating surface density on-line detection device has the advantage of high detection precision.
For convenient measurement and simplified calculation, the initial time t 0 Before the coating machine starts, the coating machine is in a halt state, so that the original radius and the weight of the pole roll 100 can be accurately and conveniently measured, the included angle theta between the leading-in part 110 of the pole roll 100 and the horizontal plane is obtained, and the included angle theta is substituted into the formula delta m 1 ＝F(sinθ 1 -sinθ 0 ) So that the first weight correction amount (delta m) can be obtained 1 The detection efficiency and the detection accuracy can be further improved.
In addition, in order to realize online monitoring, regular measurement can be carried out at preset time intervals, so that coating parameters and the like can be adjusted in time according to measurement results, and the rejection rate caused by abnormal coating can be effectively reduced.
The battery coating device according to the third aspect of the invention comprises a battery coating machine and the coating surface density online detection device. That is, the online detection device for the coating surface density is used for a battery coating machine, so that the online detection of the coating surface density can be realized, and the online detection device for the coating surface density has the advantages of no radiation, high detection efficiency and good safety.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A coating surface density online detection method is applied to a battery coating machine and is characterized by comprising the following steps:
s1, acquiring the initial time t 0 To the current time t 1 Introducing a pole piece coating area S of the pole roll;
s2, respectively obtaining initial time t 0 Initial pole roll weight M 0 And the current time t 1 Current pole roll weight M 1 ；
S3, according to the initial pole roll weight M 0 Current pole roll weight M 1 And calculating the coating surface density according to the coating area of the pole piece.
2. The method for on-line detection of coating areal density according to claim 1, characterized in that the step S1 comprises:
determining the winding speed V;
based on the initial time t 0 To the current time t 1 Determining a time interval delta t;
obtaining a coating width L;
determining a pole piece coating area S corresponding to the time interval delta t according to the following formula 1) based on the winding speed V, the time interval delta t and the coating width L,
S＝V*⊿t*L 1)。
3. the coating surface density online detection method according to claim 1, wherein the step S3 comprises:
s31, based on the initial pole roll weight M 0 Current pole roll weight M 1 Determining a pole roll weight difference Δ M corresponding to said time interval Δ t, wherein Δ M = M 1 -M 0 ；
S32, acquiring a winding tension F, and determining a first weight change correction amount delta m based on the winding tension F 1 ；
S33, based on said pole roll weight variation Δ M and a first weight variation correction amount Δ M 1 Obtaining the corrected weight difference (delta M';
s34, calculating the density rho of the coating surface based on the corrected weight difference delta M' and the coating area S of the pole piece m Where ρ is m ＝⊿M’/S。
4. The coating areal density online detection method according to claim 3, wherein the step S32 comprises:
s321, acquiring the winding tension F;
s322, obtaining the initial time t 0 Radius of pole wrap R 0 And the current time t 1 Radius of pole roll R 1 ；
S323, according to the radius R of the pole roll 1 And R 0 Determining said initial time t between the lead-in portion of the pole roll and the horizontal plane, respectively, by means of an angle determination model 0 Initial included angle theta of 0 Current angle theta to the current time 1 ；
S324, according to the winding tension F and the output included angle theta 0 Current angle of inclusion theta 1 Determining said first weight variation correction amount Δ m 1 Wherein the first weight variation correction amount Δ m 1 ＝F(sinθ 1 -sinθ 0 ) And g, wherein g is the acceleration of gravity.
5. The coating areal density online detection method of claim 4, wherein the angle determination model is determined by:
respectively obtaining the radiuses of the calibrated pole rolls at a plurality of different moments and the calibrated included angles between the lead-in parts of the corresponding pole rolls and the horizontal plane;
and obtaining the angle determination model according to the plurality of calibrated polar roll radiuses and the calibrated included angles.
6. The method for on-line detection of coating areal density according to claim 4, characterized in that the step S3 further comprises:
s35, determining the initial time t 0 To the current time t 1 A second weight variation correction Δ m of the substrate of the pole piece introduced into the pole roll 2 (vii) Δ t Δ = ρ × V ×, wherein l is the width of the base material and ρ is the areal density of the base material;
wherein, in said step S33, the pole roll weight change Δ M, the first weight change correction amount Δ M, are based on 1 And a second weight change correction amount (delta m) 2 Obtaining the corrected weight difference delta M' =deltaM + delta M 1 -⊿m 2 。
7. The on-line detection method of coating areal density according to claim 6, characterized in that, when the Δ t is less than a predetermined value, the coating areal density ρ is determined by the following equation 2) m ：
ρ m ＝[(⊿M-⊿m 2 ]/(V*⊿t*L) 2)。
8. The utility model provides a coating surface density on-line measuring device, is applied to battery coating machine which characterized in that includes:
the weighing unit is arranged below the winding device of the battery coating machine and used for weighing the pole roll weight of the pole roll;
and the calculating unit is used for calculating the coating surface density according to the coating speed, the coating width and the difference of the pole roll weight at different moments.
9. The on-line coating areal density detection device of claim 8, further comprising:
a thickness detection unit for detecting a radius of the pole roll;
the calculation unit determines an included angle between an introduction part of the polar roll and a horizontal plane according to the radius through an angle determination model, determines a first weight correction value based on the included angle and the winding tension, corrects the weight difference of the polar roll according to the first weight correction value, and calculates the coating surface density.
10. The on-line coating areal density detection device of claim 8, further comprising:
and the early warning unit receives the coating surface density calculated by the calculating unit and gives out early warning when the coating surface density exceeds a preset threshold range.
11. A battery coating apparatus, comprising:
a battery coating machine; and
the coated surface density on-line detection device according to any one of claims 8 to 10.
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| CN202211137809.XA CN115646761A (en) | 2022-09-19 | 2022-09-19 | Coating surface density online detection method and device and battery coating equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995276A (en) * | 2023-03-22 | 2023-04-21 | 四川新能源汽车创新中心有限公司 | Method and device for determining surface density of lithium battery plate and computer terminal |
| CN116817805A (en) * | 2023-06-19 | 2023-09-29 | 常州锐奇精密测量技术有限公司 | Pole piece coating edge thinning and measuring method |
| CN117073604A (en) * | 2023-10-18 | 2023-11-17 | 钛玛科（北京）工业科技有限公司 | Coating thickness measuring method, device, equipment and storage medium |
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2022
- 2022-09-19 CN CN202211137809.XA patent/CN115646761A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995276A (en) * | 2023-03-22 | 2023-04-21 | 四川新能源汽车创新中心有限公司 | Method and device for determining surface density of lithium battery plate and computer terminal |
| CN116817805A (en) * | 2023-06-19 | 2023-09-29 | 常州锐奇精密测量技术有限公司 | Pole piece coating edge thinning and measuring method |
| CN116817805B (en) * | 2023-06-19 | 2024-04-19 | 常州锐奇精密测量技术有限公司 | Pole piece coating edge thinning and measuring method |
| CN117073604A (en) * | 2023-10-18 | 2023-11-17 | 钛玛科（北京）工业科技有限公司 | Coating thickness measuring method, device, equipment and storage medium |
| CN117073604B (en) * | 2023-10-18 | 2024-01-09 | 钛玛科（北京）工业科技有限公司 | Coating thickness measuring method, device, equipment and storage medium |
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