A lithium battery coating slurry viscosity control system

Abstract

The present application relates to the field of lithium battery coating technology, and in particular to a lithium battery coating slurry viscosity control system. It includes: a central control unit, which is used to generate multiple storage sub-areas according to the equipment parameters of the buffer tank, and set monitoring points in each storage sub-area; a monitoring unit, which includes multiple monitoring sub-modules, which are arranged at the monitoring points, and the monitoring sub-modules are used to collect the slurry viscosity parameters in each storage sub-area; a stirring unit, which is arranged in the buffer tank, and the stirring unit is used to control the viscosity and uniformity of the slurry in the buffer tank; by adding a monitoring unit and a stirring unit, the buffer tank is partitioned longitudinally, and the slurry viscosity parameters of each storage sub-area are collected respectively, so as to realize real-time monitoring of the slurry sedimentation state in the buffer tank, and by establishing a three-level control mode of the stirring unit, the slurry viscosity and uniformity in the buffer tank are timely adjusted to improve the work efficiency of subsequent coating operations.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery coating, and in particular to a lithium battery coating slurry viscosity control system. Background Art

[0002] The positive electrode slurry of lithium-ion batteries is composed of positive electrode active materials, conductive agents, adhesives, etc.; the negative electrode slurry is composed of adhesives, conductive agents, graphite carbon powder, etc. There are various liquid and solid substances in the positive and negative electrode materials. The preparation process is the process of mixing these substances evenly, and the fluid properties of the slurry will also be affected by changes in temperature, viscosity and other factors. The working principle of lithium-ion batteries is the movement of various active substances in the positive and negative electrode slurries between the two poles, so the uniformity of slurry mixing and coating quality are crucial, which have a great impact on the quality of subsequent lithium-ion battery production and the performance of its products.

[0003] At present, lithium battery slurry is stored in a buffer tank after mixing, and the slurry will settle in the buffer tank, which will reduce the viscosity of the slurry and the overall uniformity of the slurry, which is not conducive to subsequent coating operations and affects the overall production efficiency of lithium batteries. Summary of the invention

[0004] The purpose of this application is: to solve the above-mentioned technical problems, this application provides a lithium battery coating slurry viscosity control system, which aims to ensure that the slurry viscosity and uniformity in the buffer tank are in the optimal range and improve the overall production efficiency of lithium batteries.

[0005] In some embodiments of the present application, by adding a monitoring unit and a stirring unit, the buffer tank is partitioned vertically, and the slurry viscosity parameters of each storage sub-area are collected separately to realize real-time monitoring of the slurry sedimentation state in the buffer tank. By establishing a three-level control mode of the stirring unit, the slurry viscosity and uniformity in the buffer tank are adjusted in time to improve the work efficiency of subsequent coating operations.

[0006] In some embodiments of the present application, the primary stirring speed of the stirring unit is dynamically adjusted according to the storage time of the slurry in the buffer tank, thereby reducing the sedimentation rate of the slurry. At the same time, a feedback time node is preset to monitor the slurry in the buffer tank, and the secondary stirring speed of the stirring unit is dynamically set according to the real-time slurry viscosity evaluation value to periodically adjust the viscosity and uniformity of the slurry.

[0007] In some embodiments of the present application, by setting a pre-adjustment time node and performing linkage control with the coating system, the slurry viscosity in the buffer tank is dynamically adjusted according to the real-time coating demand viscosity, thereby improving the efficiency of the coating operation and thus improving the overall production efficiency of lithium batteries.

[0008] In some embodiments of the present application, a lithium battery coating slurry viscosity control system is provided, comprising:

[0009] The central control unit is used to generate multiple storage sub-areas according to the equipment parameters of the cache tank and set monitoring points in each storage sub-area;

[0010] A monitoring unit, comprising a plurality of monitoring submodules, wherein the monitoring submodules are arranged at monitoring points and are used to collect slurry viscosity parameters in each storage subregion;

[0011] A stirring unit is disposed in the buffer tank, and is used to control the viscosity and uniformity of the slurry in the buffer tank;

[0012] The central control unit comprises:

[0013] The first processing module is used to set the number n of storage sub-areas according to the cross-sectional area of ​​the cache tank, and to generate n storage sub-areas by longitudinal partitioning in the cache tank, and to set monitoring points for each storage sub-area;

[0014] The first processing module is further used to establish a storage sub-region sequence A according to the longitudinal position of each storage sub-region, A=(a1, a2…an), where ai is the i-th storage sub-region;

[0015] The second processing module is used to obtain the storage time of the slurry in the buffer tank and set the primary stirring parameters of the stirring unit according to the storage time of the slurry;

[0016] The third processing module is used to obtain the slurry viscosity parameters of each storage sub-area according to the preset feedback time node and generate a slurry viscosity evaluation value;

[0017] The third processing module is also used to set the secondary stirring parameters of the stirring unit according to the slurry viscosity evaluation value;

[0018] The fourth processing module is used to obtain coating requirement parameters and determine whether to generate a correction instruction according to the coating requirement parameters.

[0019] In some embodiments of the present application, the first processing module is further used to:

[0020] Get the cross-sectional area q of the cache tank;

[0021] Preset a first cross-sectional area interval (Q1, Q2), a second cross-sectional area interval (Q2, Q3) and a third cross-sectional area interval (Q3, Q4);

[0022] If the cross-sectional area q is within the preset first cross-sectional area interval, the number of storage sub-regions n is set to the preset first number of storage sub-regions n1, ie n=n1;

[0023] If the cross-sectional area q is within the preset second cross-sectional area interval, the number of storage sub-regions n is set to the preset second number of storage sub-regions n2, ie n=n2;

[0024] If the cross-sectional area q is within the preset third cross-sectional area interval, the number of storage sub-regions n is set to the preset third number of storage sub-regions n3, that is, n=n3; and n1 <n2<n3。

[0025] In some embodiments of the present application, the second processing module is further used to:

[0026] Get the slurry storage time t;

[0027] Preset a first slurry storage time interval (T1, T2), a second slurry storage time interval (T2, T3) and a third slurry storage time interval (T3, T4);

[0028] The primary stirring speed v of the stirring unit is set according to the slurry storage time t;

[0029] If the slurry storage time t is within the preset first slurry storage time interval, the first-stage stirring speed v is set to the preset first-stage stirring speed v1, that is, v=v1;

[0030] If the slurry storage time t is within the preset second slurry storage time interval, the primary stirring speed v is set to the preset second primary stirring speed v2, ie v=v2;

[0031] If the slurry storage time t is within the preset third slurry storage time interval, the first-stage stirring speed v is set to the preset third first-stage stirring speed v3, that is, v=v3; and v1 <v2<v3。

[0032] In some embodiments of the present application, the third processing module is further used to:

[0033] Establish the slurry viscosity series B at the current feedback time node, B=(b1,b2…b n ), where b i is the slurry viscosity of the i-th storage sub-area at the current feedback time node;

[0034] Generate the average slurry viscosity ∆b at the current feedback time node;

[0035] Generate the slurry viscosity evaluation value c at the current feedback time node;

[0036] c=g*{[e1* (b i -∆b) 2 ]+[e2* (b i -b i-1 )]};

[0037] Wherein, e1 is a preset first fixed coefficient, e2 is a preset second fixed coefficient, and g is a compensation coefficient;

[0038] Preset slurry viscosity evaluation value threshold C1;

[0039] If c>C1, the third processing module generates a secondary control instruction; and sets the secondary stirring speed f and the rotation time of the stirring unit according to the slurry viscosity evaluation value c;

[0040] The third processing module is also used to reset the slurry storage time t according to the secondary control instruction.

[0041] In some embodiments of the present application, the setting of the secondary stirring speed f of the stirring unit includes:

[0042] Presetting a first slurry viscosity evaluation value interval (C1, C2), a second slurry viscosity evaluation value interval (C2, C3) and a third slurry viscosity evaluation value interval (C3, C4);

[0043] If the slurry viscosity evaluation value c is within the preset first slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset first and second stirring speeds f1, that is, f=f1;

[0044] If the slurry viscosity evaluation value c is within the preset second slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset second secondary stirring speed f2, that is, f=f2;

[0045] If the slurry viscosity evaluation value c is within the preset third slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset third secondary stirring speed f3, that is, f=f3; and f1 <f2<f3。

[0046] In some embodiments of the present application, when the third processing module sets the compensation coefficient g, it includes:

[0047] Get the slurry viscosity series B1 at the last feedback time node, B1=(b'1,b'2…b' n ), where b' i is the slurry viscosity of the i-th storage sub-area at the last feedback time node;

[0048] Generate a settlement evaluation value d;

[0049] d=[ (b' i -b i )] / n;

[0050] The compensation coefficient g is set according to the settlement evaluation value d.

[0051] In some embodiments of the present application, when the compensation coefficient g is set according to the settlement evaluation value d, it includes:

[0052] Preset a first settlement evaluation value interval (D1, D2), a second settlement evaluation value interval (D2, D3) and a third settlement evaluation value interval (D3, D4);

[0053] If the settlement evaluation value d is within the preset first settlement evaluation value interval, the compensation coefficient g is set to the preset first compensation coefficient g1, ie g=g1;

[0054] If the settlement evaluation value d is within the preset second settlement evaluation value interval, the compensation coefficient g is set to the preset second compensation coefficient g2, ie g=g2;

[0055] If the settlement evaluation value d is within the preset third settlement evaluation value interval, the compensation coefficient g is set to the preset third compensation coefficient g3, that is, g=g3; and 1 <g1<g2<g3。

[0056] In some embodiments of the present application, the fourth processing module is further used to:

[0057] Set the pre-adjustment time node according to the preset adjustment cycle;

[0058] Obtain coating requirement parameters according to the pre-adjustment time node, and generate a slurry viscosity threshold β according to the coating requirement parameters;

[0059] Obtain the slurry viscosity series B2 at the pre-adjustment time node, B2=(b 21 , b 22 …b 2n ), where b 2i is the slurry viscosity of the i-th storage sub-area at the pre-adjustment time node;

[0060] Generate the average slurry viscosity Δα at the pre-adjustment time node according to the slurry viscosity series B2;

[0061] If b2>β, a first-level correction instruction is generated;

[0062] If b2<β, a secondary correction instruction is generated, and a correction evaluation value k is generated according to the secondary correction instruction. The compensation coefficient m is set according to the correction evaluation value k, and the real-time stirring speed of the stirring unit is corrected according to the compensation coefficient m.

[0063] In some embodiments of the present application, the setting of the modified evaluation value k includes:

[0064] Generating a slurry difference according to the slurry average viscosity Δα and the slurry viscosity threshold β, and generating a first reference evaluation value H1 according to the slurry difference;

[0065] Generate a second reference evaluation value H2 based on the variance of the slurry viscosity series B2;

[0066] Generate a modified evaluation value k according to the first reference evaluation value H1 and the second reference evaluation value H2;

[0067] k=e3*H1+e4*H2, wherein e3 is a preset first weight coefficient and e4 is a preset second weight coefficient.

[0068] In some embodiments of the present application, the setting of the compensation coefficient m includes:

[0069] Presetting a first modified evaluation value interval (K1, K2), a second modified evaluation value interval (K2, K3) and a third modified evaluation value interval (K3, K4);

[0070] If the corrected evaluation value k is within the preset first corrected evaluation value interval, the correction coefficient m is set to the preset first correction coefficient m1, ie m=m1;

[0071] If the corrected evaluation value k is within the preset second corrected evaluation value interval, the correction coefficient m is set to the preset second correction coefficient m1, ie m=m2;

[0072] If the corrected evaluation value k is within the preset third corrected evaluation value interval, the correction coefficient m is set to the preset third correction coefficient m1, that is, m=m3; and 1 <m1<m2<m3。

[0073] Compared with the prior art, the lithium battery coating slurry viscosity control system of the present application embodiment has the following beneficial effects:

[0074] By adding monitoring units and stirring units, the buffer tank is divided into vertical sections, and the slurry viscosity parameters of each storage sub-area are collected separately to achieve real-time monitoring of the slurry sedimentation state in the buffer tank. By establishing a three-level control mode of the stirring unit, the slurry viscosity and uniformity in the buffer tank can be adjusted in time to improve the work efficiency of subsequent coating operations.

[0075] The first-level stirring speed of the stirring unit is dynamically adjusted according to the storage time of the slurry in the buffer tank, thereby reducing the sedimentation rate of the slurry. At the same time, the feedback time node is preset to monitor the slurry in the buffer tank, and the second-level stirring speed of the stirring unit is dynamically set according to the real-time slurry viscosity evaluation value to periodically adjust the viscosity and uniformity of the slurry.

[0076] By setting the pre-adjustment time node and performing linkage control with the coating system, the viscosity of the slurry in the buffer tank can be dynamically adjusted according to the real-time coating demand viscosity, thereby improving the efficiency of the coating operation and thus improving the overall production efficiency of lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 It is a structural schematic diagram of a lithium battery coating slurry viscosity control system in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0078] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0079] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0080] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0081] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] like Figure 1 As shown, a lithium battery coating slurry viscosity control system according to a preferred embodiment of the present application includes:

[0083] The central control unit is used to generate multiple storage sub-areas according to the equipment parameters of the cache tank and set monitoring points in each storage sub-area;

[0084] A monitoring unit, comprising a plurality of monitoring submodules, each of which is arranged at a monitoring point and is used to collect slurry viscosity parameters in each storage subregion;

[0085] A stirring unit is arranged in the buffer tank, and is used to control the viscosity and uniformity of the slurry in the buffer tank;

[0086] Specifically, the monitoring submodule is preferably a viscosity sensor, which is used to collect the slurry viscosity at the monitoring point.

[0087] Specifically, the stirring unit is preferably a double planetary stirrer, which is arranged inside the buffer tank.

[0088] The central control unit includes:

[0089] The first processing module is used to set the number n of storage sub-areas according to the cross-sectional area of ​​the cache tank, and to generate n storage sub-areas by longitudinal partitioning in the cache tank, and to set monitoring points for each storage sub-area;

[0090] The first processing module is also used to establish a storage sub-region sequence A according to the longitudinal position of each storage sub-region, A=(a1, a2…an), where ai is the i-th storage sub-region;

[0091] The second processing module is used to obtain the storage time of the slurry in the buffer tank and set the primary stirring parameters of the stirring unit according to the storage time of the slurry;

[0092] The third processing module is used to obtain the slurry viscosity parameters of each storage sub-area according to the preset feedback time node and generate a slurry viscosity evaluation value;

[0093] The third processing module is also used to set the secondary stirring parameters of the stirring unit according to the slurry viscosity evaluation value;

[0094] The fourth processing module is used to obtain coating requirement parameters and determine whether to generate a correction instruction according to the coating requirement parameters.

[0095] Specifically, a storage sub-region sequence is established based on the longitudinal position, where ai is the i-th storage sub-region arranged in order from near to far based on the distance between the storage sub-region and the tank top. That is, the i-th storage sub-region is located above the i+1-th sub-region.

[0096] Specifically, the first processing module is also used for:

[0097] Get the cross-sectional area q of the cache tank;

[0098] Preset a first cross-sectional area interval (Q1, Q2), a second cross-sectional area interval (Q2, Q3) and a third cross-sectional area interval (Q3, Q4);

[0099] If the cross-sectional area q is within the preset first cross-sectional area interval, the number of storage sub-regions n is set to the preset first number of storage sub-regions n1, ie n=n1;

[0100] If the cross-sectional area q is within the preset second cross-sectional area interval, the number of storage sub-regions n is set to the preset second number of storage sub-regions n2, ie n=n2;

[0101] If the cross-sectional area q is within the preset third cross-sectional area interval, the number of storage sub-regions n is set to the preset third number of storage sub-regions n3, that is, n=n3; and n1 <n2<n3。

[0102] Specifically, based on the cross-sectional area of ​​the cache tank, the number of storage sub-areas is dynamically adjusted. When the cross-sectional area of ​​the cache tank is too wide, the number of storage sub-areas is appropriately increased and more monitoring points are added to more accurately monitor the slurry viscosity in the cache tank.

[0103] Specifically, the second processing module is further used for:

[0104] Get the slurry storage time t;

[0105] Preset a first slurry storage time interval (T1, T2), a second slurry storage time interval (T2, T3) and a third slurry storage time interval (T3, T4);

[0106] The primary stirring speed v of the stirring unit is set according to the slurry storage time t;

[0107] If the slurry storage time t is within the preset first slurry storage time interval, the first-stage stirring speed v is set to the preset first-stage stirring speed v1, that is, v=v1;

[0108] If the slurry storage time t is within the preset second slurry storage time interval, the primary stirring speed v is set to the preset second primary stirring speed v2, ie v=v2;

[0109] If the slurry storage time t is within the preset third slurry storage time interval, the first-stage stirring speed v is set to the preset third first-stage stirring speed v3, that is, v=v3; and v1 <v2<v3。

[0110] Specifically, the storage time is the time interval between the time node when the slurry enters the cache tank and the current time node.

[0111] Specifically, in the above embodiment, the primary stirring speed of the stirring unit is dynamically adjusted according to the storage time of the slurry in the buffer tank, and the stirring unit rotates at a low speed, thereby reducing the sedimentation speed of the slurry and improving the uniformity of the slurry in the buffer tank.

[0112] In a preferred embodiment of the present application, the third processing module is also used for:

[0113] Establish the slurry viscosity series B at the current feedback time node, B=(b1,b2…b n ), where b i is the slurry viscosity of the i-th storage sub-area at the current feedback time node;

[0114] Generate the average slurry viscosity ∆b at the current feedback time node;

[0115] Generate the slurry viscosity evaluation value c at the current feedback time node;

[0116] c=g*{[e1* (b i -∆b) 2 ]+[e2* (b i -b i-1 )]};

[0117] Wherein, e1 is a preset first fixed coefficient, e2 is a preset second fixed coefficient, and g is a compensation coefficient;

[0118] Preset slurry viscosity evaluation value threshold C1;

[0119] If c>C1, the third processing module generates a secondary control instruction; and sets the secondary stirring speed f and the rotation time of the stirring unit according to the slurry viscosity evaluation value c;

[0120] The third processing module is also used to reset the slurry storage time t according to the secondary control instruction.

[0121] Specifically, by setting the first fixed coefficient and the second fixed coefficient (bi-∆b) 2 and (b i -b i-1 ) are normalized so that both are in the same reference frame.

[0122] Specifically, the higher the slurry viscosity evaluation value is, the more serious the slurry sedimentation in the buffer tank is, and the worse the uniformity and viscosity of the upper slurry are.

[0123] Specifically, when setting the secondary stirring speed f of the stirring unit, it includes:

[0124] Presetting a first slurry viscosity evaluation value interval (C1, C2), a second slurry viscosity evaluation value interval (C2, C3) and a third slurry viscosity evaluation value interval (C3, C4);

[0125] If the slurry viscosity evaluation value c is within the preset first slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset first and second stirring speeds f1, that is, f=f1;

[0126] If the slurry viscosity evaluation value c is within the preset second slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset second secondary stirring speed f2, that is, f=f2;

[0127] If the slurry viscosity evaluation value c is within the preset third slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset third secondary stirring speed f3, that is, f=f3; and f1 <f2<f3。

[0128] It is understandable that in the above embodiment, the slurry in the buffer tank is periodically monitored by adding feedback time nodes, so as to timely warn of the slurry sedimentation problem in the buffer tank, and periodically adjust the viscosity and uniformity of the slurry by dynamically adjusting the secondary stirring speed of the stirring unit.

[0129] In a preferred embodiment of the present application, when the third processing module sets the compensation coefficient g, it includes:

[0130] Get the slurry viscosity series B1 at the last feedback time node, B1=(b'1,b'2…b' n ), where b' i is the slurry viscosity of the i-th storage sub-area at the last feedback time node;

[0131] Generate a settlement evaluation value d;

[0132] d=[ (b' i -b i )] / n;

[0133] The compensation coefficient g is set according to the settlement evaluation value d.

[0134] Specifically, a sedimentation evaluation value is generated according to the slurry viscosity series of adjacent feedback time nodes, thereby dynamically reflecting the slurry sedimentation rate in the current buffer tank. The higher the sedimentation evaluation value, the faster the slurry sedimentation rate in the current buffer tank.

[0135] Specifically, when setting the compensation coefficient g according to the settlement evaluation value d, it includes:

[0136] Preset a first settlement evaluation value interval (D1, D2), a second settlement evaluation value interval (D2, D3) and a third settlement evaluation value interval (D3, D4);

[0137] If the settlement evaluation value d is within the preset first settlement evaluation value interval, the compensation coefficient g is set to the preset first compensation coefficient g1, ie g=g1;

[0138] If the settlement evaluation value d is within the preset second settlement evaluation value interval, the compensation coefficient g is set to the preset second compensation coefficient g2, ie g=g2;

[0139] If the settlement evaluation value d is within the preset third settlement evaluation value interval, the compensation coefficient g is set to the preset third compensation coefficient g3, that is, g=g3; and 1 <g1<g2<g3。

[0140] Specifically, in the above embodiment, a sedimentation evaluation value is generated by the historical change state in the buffer tank, and the compensation coefficient is dynamically adjusted according to the sedimentation evaluation value, so that the slurry viscosity evaluation value c can more accurately reflect the slurry state in the buffer tank, thereby improving the adjustment efficiency of the slurry viscosity.

[0141] In a preferred embodiment of the present application, the fourth processing module is also used for:

[0142] Set the pre-adjustment time node according to the preset adjustment cycle;

[0143] Obtain coating requirement parameters according to the pre-adjustment time node, and generate a slurry viscosity threshold β according to the coating requirement parameters;

[0144] Obtain the slurry viscosity series B2 at the pre-adjustment time node, B2=(b 21 , b 22 …b 2n ), where b 2i is the slurry viscosity of the i-th storage sub-area at the pre-adjustment time node;

[0145] Generate the average slurry viscosity Δα at the pre-adjustment time node according to the slurry viscosity series B2;

[0146] If Δα<β, a first-level correction instruction is generated;

[0147] If Δα>β, a secondary correction instruction is generated, and a correction evaluation value k is generated according to the secondary correction instruction. The compensation coefficient m is set according to the correction evaluation value k, and the real-time stirring speed of the stirring unit is corrected according to the compensation coefficient m.

[0148] Specifically, the first-level correction instruction refers to appropriately reducing the stirring speed, thereby increasing the viscosity of the slurry at the bottom of the tank to meet the coating requirements.

[0149] Specifically, by adding a pre-adjustment time node, sufficient adjustment time is left for the slurry in the tank, so that the viscosity of the slurry is more in line with the coating requirements and the coating efficiency is improved.

[0150] Specifically, the adjustment cycle can be set according to historical parameters, and the time interval between the pre-adjustment time node and the coating start time node is an adjustment cycle, with the pre-adjustment time node being in front and the coating start time node being in the back.

[0151] Specifically, when setting the modified evaluation value k, it includes:

[0152] Generating a slurry difference according to the slurry average viscosity Δα and the slurry viscosity threshold β, and generating a first reference evaluation value H1 according to the slurry difference;

[0153] Generate a second reference evaluation value H2 based on the variance of the slurry viscosity series B2;

[0154] Generate a modified evaluation value k according to the first reference evaluation value H1 and the second reference evaluation value H2;

[0155] k=e3*H1+e4*H2, wherein e3 is a preset first weight coefficient and e4 is a preset second weight coefficient.

[0156] Specifically, the first reference evaluation value and the second reference evaluation value have the same value range. The larger the slurry difference, the larger the corresponding first reference evaluation value. The larger the variance, the worse the slurry uniformity, and the larger the corresponding second reference evaluation value.

[0157] Specifically, when setting the compensation coefficient m, it includes:

[0158] Presetting a first modified evaluation value interval (K1, K2), a second modified evaluation value interval (K2, K3) and a third modified evaluation value interval (K3, K4);

[0159] If the corrected evaluation value k is within the preset first corrected evaluation value interval, the correction coefficient m is set to the preset first correction coefficient m1, ie m=m1;

[0160] If the corrected evaluation value k is within the preset second corrected evaluation value interval, the correction coefficient m is set to the preset second correction coefficient m1, ie m=m2;

[0161] If the corrected evaluation value k is within the preset third corrected evaluation value interval, the correction coefficient m is set to the preset third correction coefficient m1, that is, m=m3; and 1 <m1<m2<m3。

[0162] Specifically, the higher the corrected evaluation value, the greater the difference between the current slurry uniformity and viscosity in the buffer tank and the required value. By setting the correction coefficient, the real-time stirring speed of the stirring unit is increased, the slurry viscosity in the buffer tank is dynamically adjusted, and the efficiency of the coating operation is improved.

[0163] According to the first concept of the present application, by adding a monitoring unit and a stirring unit, the buffer tank is partitioned vertically, and the slurry viscosity parameters of each storage sub-area are collected separately to realize real-time monitoring of the slurry sedimentation state in the buffer tank. By establishing a three-level control mode of the stirring unit, the viscosity and uniformity of the slurry in the buffer tank are adjusted in time to improve the work efficiency of subsequent coating operations.

[0164] According to the second concept of the present application, the primary stirring speed of the stirring unit is dynamically adjusted according to the storage time of the slurry in the buffer tank, thereby reducing the sedimentation rate of the slurry. At the same time, a feedback time node is preset to monitor the slurry in the buffer tank, and the secondary stirring speed of the stirring unit is dynamically set according to the real-time slurry viscosity evaluation value to periodically adjust the viscosity and uniformity of the slurry.

[0165] According to the third concept of the present application, by setting a pre-adjustment time node and performing linkage control with the coating system, the slurry viscosity in the buffer tank is dynamically adjusted according to the real-time coating demand viscosity, thereby improving the efficiency of the coating operation and thus improving the overall production efficiency of lithium batteries.

[0166] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A lithium battery coating slurry viscosity control system, characterized in that: include: The central control unit is used to generate multiple storage sub-areas according to the equipment parameters of the cache tank and set monitoring points in each storage sub-area; A monitoring unit, comprising a plurality of monitoring submodules, wherein the monitoring submodules are arranged at monitoring points and are used to collect slurry viscosity parameters in each storage subregion; A stirring unit is disposed in the buffer tank, and is used to control the viscosity and uniformity of the slurry in the buffer tank; The central control unit comprises: The first processing module is used to set the number n of storage sub-areas according to the cross-sectional area of ​​the cache tank, and to generate n storage sub-areas by longitudinal partitioning in the cache tank, and to set monitoring points for each storage sub-area; The first processing module is further used to establish a storage sub-region sequence A according to the longitudinal position of each storage sub-region, A=(a1, a2…an), where ai is the i-th storage sub-region; The second processing module is used to obtain the storage time of the slurry in the buffer tank and set the primary stirring parameters of the stirring unit according to the storage time of the slurry; The third processing module is used to obtain the slurry viscosity parameters of each storage sub-area according to the preset feedback time node and generate a slurry viscosity evaluation value; The third processing module is also used to set the secondary stirring parameters of the stirring unit according to the slurry viscosity evaluation value; A fourth processing module, used for obtaining coating requirement parameters and determining whether to generate a correction instruction according to the coating requirement parameters; When the third processing module sets the compensation coefficient g, it includes: Get the slurry viscosity series B1 at the last feedback time node, B1=(b'1,b'2…b' n ), where b' i is the slurry viscosity of the i-th storage sub-area at the last feedback time node; Generate a settlement evaluation value d; d=[ (b' i -b i )] / n; Set the compensation coefficient g according to the settlement evaluation value d; The third processing module is also used for: Establish the slurry viscosity series B at the current feedback time node, B=(b1,b2…b n ), where b i is the slurry viscosity of the i-th storage sub-area at the current feedback time node; Generate the average slurry viscosity ∆b at the current feedback time node; Generate the slurry viscosity evaluation value c at the current feedback time node; c=g*{[e1* (b i -∆b) 2 ]+[e2* (b i -b i-1 )]}; Wherein, e1 is a preset first fixed coefficient, e2 is a preset second fixed coefficient, and g is a compensation coefficient; Preset slurry viscosity evaluation value threshold C1; If c>C1, the third processing module generates a secondary control instruction; and sets the secondary stirring speed f and the rotation time of the stirring unit according to the slurry viscosity evaluation value c; The third processing module is also used to reset the slurry storage time t according to the secondary control instruction.

2. The lithium battery coating slurry viscosity control system according to claim 1, characterized in that: The first processing module is also used for: Get the cross-sectional area q of the cache tank; Preset a first cross-sectional area interval (Q1, Q2), a second cross-sectional area interval (Q2, Q3) and a third cross-sectional area interval (Q3, Q4); If the cross-sectional area q is within the preset first cross-sectional area interval, the number of storage sub-regions n is set to the preset first number of storage sub-regions n1, ie n=n1; If the cross-sectional area q is within the preset second cross-sectional area interval, the number of storage sub-regions n is set to the preset second number of storage sub-regions n2, ie n=n2; If the cross-sectional area q is within the preset third cross-sectional area interval, the number of storage sub-regions n is set to the preset third number of storage sub-regions n3, that is, n=n3; and n1 <n2<n3。 3. The lithium battery coating slurry viscosity control system according to claim 1, characterized in that: The second processing module is also used for: Get the slurry storage time t; Preset a first slurry storage time interval (T1, T2), a second slurry storage time interval (T2, T3) and a third slurry storage time interval (T3, T4); The primary stirring speed v of the stirring unit is set according to the slurry storage time t; If the slurry storage time t is within the preset first slurry storage time interval, the first-stage stirring speed v is set to the preset first-stage stirring speed v1, that is, v=v1; If the slurry storage time t is within the preset second slurry storage time interval, the primary stirring speed v is set to the preset second primary stirring speed v2, ie v=v2; If the slurry storage time t is within the preset third slurry storage time interval, the first-stage stirring speed v is set to the preset third first-stage stirring speed v3, that is, v=v3; and v1 <v2<v3。 4. The lithium battery coating slurry viscosity control system according to claim 3, characterized in that: The setting of the secondary stirring speed f of the stirring unit includes: Presetting a first slurry viscosity evaluation value interval (C1, C2), a second slurry viscosity evaluation value interval (C2, C3) and a third slurry viscosity evaluation value interval (C3, C4); If the slurry viscosity evaluation value c is within the preset first slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset first and second stirring speeds f1, that is, f=f1; If the slurry viscosity evaluation value c is within the preset second slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset second secondary stirring speed f2, that is, f=f2; If the slurry viscosity evaluation value c is within the preset third slurry viscosity evaluation value interval, the secondary stirring speed f is set to the preset third secondary stirring speed f3, that is, f=f3; and f1 <f2<f3。 5. The lithium battery coating slurry viscosity control system according to claim 4, characterized in that: When setting the compensation coefficient g according to the settlement evaluation value d, it includes: Preset a first settlement evaluation value interval (D1, D2), a second settlement evaluation value interval (D2, D3) and a third settlement evaluation value interval (D3, D4); If the settlement evaluation value d is within the preset first settlement evaluation value interval, the compensation coefficient g is set to the preset first compensation coefficient g1, ie g=g1; If the settlement evaluation value d is within the preset second settlement evaluation value interval, the compensation coefficient g is set to the preset second compensation coefficient g2, ie g=g2; If the settlement evaluation value d is within the preset third settlement evaluation value interval, the compensation coefficient g is set to the preset third compensation coefficient g3, that is, g=g3; and 1 <g1<g2<g3。 6. The lithium battery coating slurry viscosity control system according to claim 5, characterized in that: The fourth processing module is further used for: Set the pre-adjustment time node according to the preset adjustment cycle; Obtain coating requirement parameters according to the pre-adjustment time node, and generate a slurry viscosity threshold β according to the coating requirement parameters; Obtain the slurry viscosity series B2 at the pre-adjustment time node, B2=(b 21 , b 22 …b 2n ), where b 2i is the slurry viscosity of the i-th storage sub-area at the pre-adjustment time node; Generate the average slurry viscosity Δα at the pre-adjustment time node according to the slurry viscosity series B2; If Δα<β, a first-level correction instruction is generated; If Δα>β, a secondary correction instruction is generated, and a correction evaluation value k is set according to the secondary correction instruction, a compensation coefficient m is set according to the correction evaluation value k, and the real-time stirring speed of the stirring unit is corrected according to the compensation coefficient m.

7. The lithium battery coating slurry viscosity control system according to claim 6, characterized in that: When setting the modified evaluation value k, it includes: Generating a slurry difference according to the slurry average viscosity Δα and the slurry viscosity threshold β, and generating a first reference evaluation value H1 according to the slurry difference; Generate a second reference evaluation value H2 based on the variance of the slurry viscosity series B2; Generate a modified evaluation value k according to the first reference evaluation value H1 and the second reference evaluation value H2; k=e3*H1+e4*H2, wherein e3 is a preset first weight coefficient and e4 is a preset second weight coefficient.

8. The lithium battery coating slurry viscosity control system according to claim 7, characterized in that: The setting of the compensation coefficient m includes: Presetting a first modified evaluation value interval (K1, K2), a second modified evaluation value interval (K2, K3) and a third modified evaluation value interval (K3, K4); If the corrected evaluation value k is within the preset first corrected evaluation value interval, the correction coefficient m is set to the preset first correction coefficient m1, ie m=m1; If the corrected evaluation value k is within the preset second corrected evaluation value interval, the correction coefficient m is set to the preset second correction coefficient m1, ie m=m2; If the corrected evaluation value k is within the preset third corrected evaluation value interval, the correction coefficient m is set to the preset third correction coefficient m1, that is, m=m3; and 1 <m1<m2<m3。

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