Deviation correction method of lamination equipment and lamination equipment

Abstract

The invention relates to the technical field of batteries, and discloses a deviation rectifying method of lamination equipment and the lamination equipment, the deviation rectifying method of the lamination equipment comprises the following steps: in response to a deviation rectifying request, obtaining position relation data of a pole piece group, the pole piece group comprises N layers of pole piece units, each pole piece unit comprises a positive pole piece and a negative pole piece which are at least partially overlapped, each pole piece unit has a corresponding position relation parameter; for each pole piece unit, a deviation number set of the pole piece unit is calculated based on the corresponding position relation parameter, and the deviation number set comprises an angle deviation value and at least one preset direction deviation value; processing the deviation number set corresponding to at least one pole piece unit to obtain a deviation mean value corresponding to the pole piece group; based on the deviation mean value and the preset range, a deviation correction value is determined; and correcting the lamination equipment according to the correction value. The deviation degree of the lamination equipment can be calculated in real time, automatic deviation correction can be achieved, the deviation correction accuracy and reliability are improved, and the percent of pass of battery cells can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a deviation correction method for lamination equipment and the lamination equipment. Background Art

[0002] The stacking process of the battery cell is to cut the electrode sheets into a certain size and shape, and then stack the cut positive and negative electrode sheets in sequence through the stacking equipment. During the stacking process, if the edge of the negative electrode sheet exceeds the positive electrode sheet, lithium will form dendrites on the positive electrode when the battery cell is charged. The dendrites can easily pierce the diaphragm and cause a short circuit inside the battery. Therefore, during the stacking process, it is necessary to control the edge of the positive electrode sheet to exceed the negative electrode sheet.

[0003] However, due to the accuracy of the stacking equipment itself, the positive and negative electrodes are inevitably offset during the stacking process. At present, manual correction is generally performed based on the initial position and posture of the electrode. The manual correction method has the problems of low accuracy and poor reliability, resulting in a low pass rate of the battery cells. Summary of the invention

[0004] In view of this, the present invention provides a deviation correction method for a lamination device and a lamination device, so as to solve the problem that manual deviation correction of the lamination device has low accuracy and poor reliability, resulting in a low qualified rate of battery cells.

[0005] In a first aspect, the present invention provides a method for correcting a lamination device, comprising:

[0006] In response to a correction request, positional relationship data of a pole piece group is acquired, the pole piece group includes N pole piece units, each of the pole piece units includes a positive pole piece and a negative pole piece that are at least partially overlapped, and each of the pole piece units has a corresponding positional relationship parameter;

[0007] For each of the pole piece units, a deviation number set of the pole piece unit is calculated based on the corresponding position relationship parameter, wherein the deviation number set includes an angle deviation value and at least one preset direction deviation value;

[0008] Processing the deviation number set corresponding to at least one of the pole piece units to obtain the deviation mean value corresponding to the pole piece group;

[0009] Determine a deviation correction value based on the deviation from the mean value and the preset range;

[0010] The lamination equipment is oriented according to the oriented value.

[0011] In a second aspect, the present invention further provides a lamination device, comprising:

[0012] An acquisition module, in response to a correction request, acquires positional relationship data of a pole piece group, wherein the pole piece group includes N pole piece units, each of the pole piece units includes a positive pole piece and a negative pole piece that are at least partially overlapped, and each of the pole piece units has a corresponding positional relationship parameter;

[0013] A calculation module, for each of the pole piece units, calculates a deviation number set of the pole piece unit based on a corresponding position relationship parameter, wherein the deviation number set includes an angle deviation value and at least one preset direction deviation value;

[0014] A processing module processes the deviation number set corresponding to at least one of the pole piece units to obtain a deviation mean value corresponding to the pole piece group;

[0015] A comparison module, for comparing the deviation mean obtained by the processing module with a preset range to determine a deviation correction value;

[0016] A correction module corrects the lamination device according to the correction value determined by the comparison module.

[0017] Beneficial effect: The present invention obtains the position relationship parameters of the positive and negative electrodes of each layer of electrode unit, calculates the deviation number set of the electrode unit through the position relationship parameters, the deviation number set includes an angle deviation value and at least one preset direction deviation value, and statistically processes the deviation mean of the deviation number set, and then determines the angle and preset direction correction value according to the deviation mean and the size of the preset range, and finally corrects the stacking equipment according to the correction value. The present invention can calculate the degree of deviation between the positive and negative electrodes of each layer of electrode unit of the stacking equipment in real time, and automatically corrects the deviation according to the degree of deviation to form a closed-loop control compensation action, thereby improving the correction accuracy and reliability of the stacking equipment, and is beneficial to improving the qualified rate of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic flow chart of a deviation correction method for a lamination device according to an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a lamination device according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic structural diagram of a pole piece unit of a lamination device according to an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 100, acquisition module; 200, calculation module; 300, processing module; 400, comparison module; 500, correction module;

[0024] 1. Pole unit; 2. Positive electrode; 201. Positive electrode coating area; 202. Positive electrode ear area; 3. Negative electrode; 301. Negative electrode coating area; 302. Negative electrode ear area. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0027] According to an embodiment of the present invention, on the one hand, Figure 1 As shown, a deviation correction method for a lamination device is provided, comprising:

[0028] S100, in response to a correction request, obtaining positional relationship data of a pole piece group, the pole piece group comprising N pole piece units 1, each pole piece unit 1 comprising at least partially overlapping positive pole pieces 2 and negative pole pieces 3, and each pole piece unit 1 having corresponding positional relationship parameters.

[0029] S200 . For each pole piece unit 1 , a deviation number set of the pole piece unit 1 is calculated based on corresponding position relationship parameters, where the deviation number set includes an angle deviation value and at least one preset direction deviation value.

[0030] S300, processing the deviation number set corresponding to at least one pole piece unit 1 to obtain the deviation mean value corresponding to the pole piece group.

[0031] S400: Determine a deviation correction value based on the deviation from the mean value and the preset range.

[0032] S500, correcting the deviation of the lamination equipment according to the deviation correction value.

[0033] It can be seen that the correction method for the stacking equipment provided in the embodiment of the present invention obtains the position relationship parameters of the positive electrode sheet 2 and the negative electrode sheet 3 of each layer of the electrode sheet unit 1, calculates the deviation number set of the electrode sheet unit 1 through the position relationship parameters, and the deviation number set includes an angle deviation value and at least one preset direction deviation value, and statistically processes the deviation mean of the deviation number set, and then determines the correction value of the angle and the preset direction according to the size of the deviation mean and the preset range, and finally corrects the stacking equipment according to the correction value, and can calculate the degree of deviation between the positive electrode sheet 2 and the negative electrode sheet 3 of each layer of the electrode sheet unit 1 of the stacking equipment in real time, and automatically corrects the deviation according to the degree of deviation to form a closed-loop control compensation action, thereby improving the correction accuracy and reliability of the stacking equipment, and is conducive to improving the qualified rate of the battery cell.

[0034] Compared with the traditional unidirectional compensation mechanism, the embodiment of the present invention can detect and correct the stacking deflection angle of the positive electrode sheet 2 and the negative electrode sheet 3 and the deflection displacement in at least one direction, so the accuracy is higher, which can improve the reliability and reduce the probability of battery cells being scrapped due to stacking offset, thereby improving the qualified rate of battery cells.

[0035] Specifically, the number of layers of the electrode group can be set as needed. For example, if a battery cell includes 100 layers of electrode units 1 and N layers are 20 layers, then a electrode group includes 20 layers of electrode units 1, and the battery cell can include 5 electrode groups. During the stacking process, the deviation is corrected every 20 layers. After the stacking equipment corrects the deviation, the subsequent electrodes can be accurately stacked. After the battery cell completes 20 layers of stacking, a deviation correction request is triggered.

[0036] In one embodiment, in step S100, obtaining position relationship data of the electrode group includes:

[0037] S110 , obtaining position relationship parameters of the positive electrode coating area 201 and the positive electrode lug area 202 of the positive electrode sheet 2 and the negative electrode coating area 301 and the negative electrode lug area 302 of the negative electrode sheet 3 of each layer of the electrode sheet unit 1 .

[0038] Specifically, the portion with active material on the positive electrode sheet 2 and the negative electrode sheet 3 constitutes the coating area, and the portion without active material on the positive electrode sheet 2 and the negative electrode sheet 3 each forms a lug area. In addition, a diaphragm for insulation is provided between the positive electrode sheet 2 and the negative electrode sheet 3. The diaphragm can prevent the positive electrode sheet 2 and the negative electrode sheet 3 from contacting each other and causing a short circuit inside the battery cell. The diaphragm, as a semi-permeable layer, can also prevent larger molecules from passing through, and only allow small-volume charged ions to pass through, so as to facilitate normal charging and discharging.

[0039] Further, in one embodiment, S110, obtaining the position relationship parameters of the positive electrode coating area 201 and the positive electrode ear area 202 of the positive electrode sheet 2 of each layer of the electrode sheet unit 1 and the negative electrode coating area 301 and the negative electrode ear area 302 of the negative electrode sheet 3, includes:

[0040] S111, obtaining a first interval g1 between the positive electrode ear region 202 and the negative electrode coating region 301 in the first direction, a second interval g2 between the positive electrode coating region 201 and the negative electrode coating region 301 on one side of the first direction, and a width L of the positive electrode coating region 201, wherein the first interval g1 and the second interval g2 are arranged opposite to each other in the second direction. Figure 3 As shown by the arrow X in Figure 3 As shown by the arrow Y in FIG. The first interval g1, the second interval g2 and the width L of the positive electrode coating area 201 are as shown in FIG. Figure 3 shown.

[0041] In step S200 , the angle deviation value θ is calculated using the following formula: θ=arctan((g1−g2) / L).

[0042] For each layer of the electrode unit 1, the angle deviation value θ, that is, the deflection angle of the positive electrode sheet 2 relative to the negative electrode sheet 3, can be calculated through the first interval g1, the second interval g2 and the width L of the positive electrode coating area 201. The angle deviation values ​​θ of each layer of the electrode unit 1 are averaged to obtain the angle deviation mean R0 corresponding to the electrode group. After comparing the angle deviation mean R0 with the size of the preset angle range, the angle correction value R1 can be determined, and then the stacking angles of the positive electrode sheet 2 and the negative electrode sheet 3 of the stacking equipment are corrected according to the angle correction value R1.

[0043] Further, in one embodiment, S110, obtaining the position relationship parameters of the positive electrode coating area 201 and the positive electrode ear area 202 of the positive electrode sheet 2 of each layer of the electrode sheet unit 1 and the negative electrode coating area 301 and the negative electrode ear area 302 of the negative electrode sheet 3, further includes:

[0044] S112 , obtaining a third gap g3 between the positive electrode coating region 201 and the negative electrode coating region 301 on the other side of the first direction, wherein the third gap g3 and the second gap g2 are arranged opposite to each other in the first direction.

[0045] In step S200, the preset direction deviation value includes a first direction deviation value x, and the calculation formula of the first direction deviation value x is as follows: x=(g2-g3) / 2.

[0046] For each layer of electrode unit 1, the first direction deviation value x, that is, the offset of the positive electrode 2 relative to the negative electrode 3 in the first direction, can be calculated through the second interval g2 and the third interval g3. The first direction deviation values ​​x of each layer of electrode unit 1 are averaged to obtain the first direction deviation mean x0 corresponding to the electrode group. After comparing the first direction deviation mean x0 with the size of the preset range of the first direction, the first direction correction value x1 can be determined, and then the first direction offset of the positive electrode 2 and the negative electrode 3 of the stacking equipment can be corrected according to the first direction correction value x1.

[0047] Further, in one embodiment, S110, obtaining the position relationship parameters of the positive electrode coating area 201 and the positive electrode ear area 202 of the positive electrode sheet 2 of each layer of the electrode sheet unit 1 and the negative electrode coating area 301 and the negative electrode ear area 302 of the negative electrode sheet 3, further includes:

[0048] S113 , obtaining a fourth interval k1 and a fifth interval k2 between the positive electrode coating area 201 and the negative electrode coating area 301 in the second direction, wherein the fourth interval k1 and the fifth interval k2 are arranged opposite to each other in the second direction.

[0049] In step S200, the preset direction deviation value includes a second direction deviation value y, and the calculation formula of the second direction deviation value y is as follows: y=(k1-k2) / 2.

[0050] For each layer of electrode unit 1, the second direction deviation value y, that is, the offset of the positive electrode 2 relative to the negative electrode 3 in the second direction, can be calculated through the fourth interval k1 and the fifth interval k2. The second direction deviation value y of each layer of electrode unit 1 is averaged to obtain the second direction deviation mean y0 corresponding to the electrode group. After comparing the second direction deviation mean y0 with the size of the preset range of the second direction, the second direction correction value y1 can be determined, and then the second direction offset of the positive electrode 2 and the negative electrode 3 of the lamination equipment can be corrected according to the second direction correction value y1.

[0051] Each layer of the electrode unit 1 includes at least five position relationship parameters in the first direction and the second direction, which can more comprehensively reflect the relative offset of the positive electrode 2 and the negative electrode 3, thereby facilitating the improvement of the deviation correction accuracy. The first interval g1, the second interval g2, the third interval g3, the fourth interval k1 and the fifth interval k2 can all be automatically acquired by the camera.

[0052] In one embodiment, S300, processing the deviation number set corresponding to at least one pole piece unit 1 to obtain the deviation mean value corresponding to the pole piece group includes:

[0053] S310, remove a preset number of maximum and minimum values ​​in the deviation set, and calculate the mean of the remaining values ​​in the deviation set to obtain a deviation mean. By removing a certain number of maximum and minimum values ​​in the deviation set, the mean fluctuation can be reduced, thereby obtaining a deviation mean that is more consistent with the actual offset.

[0054] It should be noted that the preset number of maximum values ​​and minimum values ​​can be selected as needed, such as one, two or more than two. The preset number of maximum values ​​and minimum values ​​to be eliminated can be the same or different. Exemplarily, the preset number of maximum values ​​and minimum values ​​are both three, then the three maximum values ​​and three minimum values ​​in the deviation number set are eliminated, and the mean of the remaining values ​​is calculated to obtain the deviation mean.

[0055] In one embodiment, S400, determining a deviation correction value based on a deviation from a mean value and a preset range includes:

[0056] S410: When the absolute value of the deviation from the mean is smaller than a preset range, the deviation correction value = 0.

[0057] S420: When the absolute value of the deviation from the mean is within a preset range, the deviation correction value = the deviation from the mean.

[0058] S430. When the absolute value of the deviation from the mean is greater than the preset range and the deviation from the mean is a positive value, the deviation correction value = the maximum value of the preset range; when the absolute value of the deviation from the mean is greater than the preset range and the deviation from the mean is a negative value, the deviation correction value = - the maximum value of the preset range.

[0059] It should be noted that each deviation from the mean value needs to be compared with the preset range to determine the respective correction value. The preset range is Z min To Z max , where Z min is the execution accuracy of the lamination equipment, Z max The setting can be selected according to the lamination equipment and the model of the prepared battery cell.

[0060] Specifically, the deviation from the mean includes an angle deviation from the mean R0, a first direction deviation from the mean x0 and a second direction deviation from the mean y0, and the corresponding preset range includes an angle preset range, and the angle preset range is Z min1 To Z max1 , for example, Z min1 0.03°, Z max1 The preset range of the first direction is Z min2 To Z max2 , for example, Z min2 0.03mm, Z max2 The preset range of the second direction is Z min3 To Z max3 , for example, Z min3 0.03mm, Z max3 It is 0.08mm.

[0061] For the angle deviation from the mean R0:

[0062] When |R0|<Z min1 When , the angle correction value R1=0;

[0063] When Z min1 <|R0|<Z max1 When , the angle correction value R1=R0;

[0064] When |R0|>Z max1 , and R0>0, then the angle correction value R1=Zmax1 ;

[0065] When |R0|>Z max1 , and R0<0, then the angle correction value R1=﹣Z max1 .

[0066] For the first direction deviation from the mean x0:

[0067] When |x0|<Z min2 When , the first direction correction value x1=0;

[0068] When Z min2 <|x0|<Z max2 When , the first direction correction value x1=x0;

[0069] When |x0|>Z max2 , and x0>0, then the first direction correction value x1=Z max2 ;

[0070] When |x0|>Z max2 , and x0<0, then the first direction correction value x1=﹣Z max2 .

[0071] For the second direction deviation from the mean y0:

[0072] When |y0|<Z min3 When , the second direction correction value y1=0;

[0073] When Z min3 <|y0|<Z max3 When , the second direction correction value y1 = y0;

[0074] When |y0|>Z max3 , and y0>0, then the second direction correction value y1=Z max3 ;

[0075] When |y0|>Z max3 , and y0<0, then the second direction correction value y1=﹣Z max3 .

[0076] In one embodiment, before the step of correcting the lamination device according to the correction value in S500, the method further includes:

[0077] S600. Based on the position relationship parameters corresponding to each pole piece unit 1, calculate the deviation correction condition value corresponding to the pole piece group, where the deviation correction condition value includes at least one of range, variance and mean difference.

[0078] S700: judging the deviation correction condition value according to a preset condition, and determining whether the deviation correction condition value satisfies the preset condition.

[0079] Specifically, the preset conditions include that the position relationship parameters of the N-layer pole piece units 1 satisfy at least one of the range <0.5, variance <0.25, and mean difference <1.

[0080] It should be noted that when the correction condition value does not meet the preset condition, it indicates that the stacking equipment has a fault, causing a large offset between the positive electrode sheet 2 and the negative electrode sheet 3. This offset is not caused by the equipment accuracy, so it is necessary to check the related faults.

[0081] The process parameters of the lamination equipment in the embodiment of the present invention are further described in detail below in conjunction with specific embodiments. These examples should not be construed as limiting the scope of protection claimed by the present invention.

[0082] In response to the correction request, refer to Table 1 to obtain the position relationship parameters of 40 layers of pole piece units 1. The position relationship parameters of every 20 layers of pole piece units 1 are taken as a group of data. The first group is the pole piece units from the 1st to the 20th layers, and the second group is the pole piece units from the 21st to the 40th layers.

[0083] Table 1. Position relationship parameters

[0084]

[0085] The angle deviation value θ, the first direction deviation value x and the second direction deviation value y are calculated respectively. The results are shown in Table 2.

[0086] Table 2. Calculation results of angle deviation value θ, first direction deviation value x and second direction deviation value y

[0087] x(mm) y(mm) θ(°) -0.005 -0.06 0 0.22 0 -0.057874505 0.115 -0.01 -0.031830985 0.1 0.075 -0.02893726 0.025 -0.05 -0.008681179 -0.1 -0.03 0.02893726 0.085 0.06 -0.034724711 0.05 0.005 -0.02893726 0.07 0.035 -0.02893726 0.125 -0.03 -0.040512161 0.035 0 -0.017362357 -0.03 -0.07 -0.002893726 0.115 -0.11 -0.014468631 -0.025 -0.04 0 0.015 0.025 0.011574905 -0.01 -0.03 0.014468631 0.04 0 -0.011574905 0.165 0.01 -0.04629961 0.07 -0.04 0 0.12 -0.05 -0.040512161 0.07 0.06 -0.02893726 0.06 0.02 -0.023149809 0.11 0.075 -0.014468631 0.065 -0.03 0.002893726 0.03 0.06 -0.017362357 0.135 0.05 -0.034724711 0.13 -0.02 -0.011574905 0.185 0.015 -0.054980782 0.01 -0.03 -0.026043534 -0.14 -0.04 0.04629961 0.05 -0.07 -0.008681179 0.035 -0.03 -0.008681179 0.055 0.06 -0.020256083 -0.01 -0.1 0.020256083 0.03 -0.02 0.005787452 -0.14 -0.03 0.031830985 0.125 0.055 -0.02893726 0.04 0.015 -0.005787452 0.025 0.02 -0.005787452 -0.09 -0.02 0.031830985

[0088] Eliminate the three maximum and three minimum values ​​in the two sets of position relationship parameters and calculate their respective means.

[0089] Specifically, the first group of angle deviation values ​​θ excludes three maximum values ​​of 0.011574905°, 0.014468631° and 0.02893726°, and three minimum values ​​of -0.057874505°, -0.04629961° and -0.040512161°. The first direction deviation value x excludes three maximum values ​​of 0.125mm, 0.165mm and 0.22mm, and three minimum values ​​of -0.1mm, -0.03mm and -0.025mm. The second direction deviation value y excludes three maximum values ​​of 0.036mm, 0.06mm and 0.075mm, and three minimum values ​​of -0.11mm, -0.07mm and -0.055mm.

[0090] The second group of angle deviation values ​​θ excludes three maximum values ​​of 0.031830985°, 0.031830985° and 0.04629961°, and three minimum values ​​of -0.054980782°, -0.034724711° and -0.02893726°. The first direction deviation value x excludes three maximum values ​​of 0.13mm, 0.135mm and 0.185mm, and three minimum values ​​of -0.14mm, -0.14mm and -0.09mm. The second direction deviation value y excludes three maximum values ​​of 0.06mm, 0.06mm and 0.075mm, and three minimum values ​​of -0.0951mm, -0.07mm and -0.035mm.

[0091] Then the angle of the first group deviates from the mean value R 01 =-0.01778°, the first direction deviates from the mean x 01 =0.058929mm, the second direction deviates from the mean value y 01 =-0.01607mm.

[0092] The angle deviation of the second group from the mean R 02 =-0.01013°, the first direction deviates from the mean x 02 =0.049643mm, the second direction deviates from the mean value y 02 =0.006071mm.

[0093] The preset angle range is 0.03° to 0.05°, and the preset first direction range and the preset second direction range are both 0.03mm to 0.08mm.

[0094] ∣R 01 ∣<0.03°, then the angle correction value of the first group is R 11 =0;

[0095] 0.03mm<|x 01 |<0.08mm, then the first direction correction value x of the first group 11 =x 01 =0.058929mm;

[0096] ∣y 01 ∣<0.03mm, then the second direction correction value y of the first group 11 =0.

[0097] ∣R 02 ∣<0.03°, then the angle correction value of the second group is R 11 =0;

[0098] 0.03mm<|x 02 ∣<0.08mm, then the first direction correction value x of the second group 12=x 02 =0.049643mm;

[0099] ∣y 02 ∣<0.03mm, then the second direction correction value y of the second group 12 =0.

[0100] In the first group, the range of the first interval g1 is 0.13<0.5, and the variance is 0.001209<0.25, the range of the second interval g2 is 0.32<0.5, and the variance is 0.006367<0.25, the range of the third interval g3 is 0.32<0.5, and the variance is 0.006264<0.25, the range of the fourth interval k1 is 0.2<0.5, and the variance is 0.002599<0.25, and the range of the fifth interval k2 is 0.19<0.5, and the variance is 0.002308<0.25. The preset conditions are met.

[0101] In the second group, the range of the first interval g1 is 0.23<0.5, and the variance is 0.003403<0.25, the range of the second interval g2 is 0.47<0.5, and the variance is 0.013331<0.25, the range of the third interval g3 is 0.34<0.5, and the variance is 0.005969<0.25, the range of the fourth interval k1 is 0.16<0.5, and the variance is 0.001752<0.25, and the range of the fifth interval k2 is 0.25<0.5, and the variance is 0.003824<0.25. The preset conditions are met.

[0102] The mean difference between the two groups of first intervals g1 is -0.004<1, the mean difference between the two groups of second intervals g2 is -0.0365<1, the mean difference between the two groups of third intervals g3 is 0.004<1, the mean difference between the two groups of fourth intervals k1 is -0.008<1, and the mean difference between the two groups of fifth intervals k2 is -0.045<1. The preset conditions are met.

[0103] It should be noted that when calculating the range, variance and mean, you can choose not to eliminate data as needed and calculate all the position relationship parameters of the pole piece group, or you can choose to eliminate a preset number of maximum and minimum values ​​and calculate the remaining position relationship parameters. The embodiments of the present invention do not impose too many restrictions on this.

[0104] For the first set of pole piece units 1, according to the first direction correction value x 11 Correct the lamination equipment.

[0105] For the second set of pole piece units 1, according to the first direction correction value x 12 Correct the lamination equipment.

[0106] It can be seen that the first direction correction value x of the first set of pole piece units 1 is11 After the automatic deviation correction according to the embodiment of the present invention, the first direction deviation correction value x of the second group of pole piece units 1 is 12 The size of the stacking device can be reduced, thereby significantly improving the reliability of the stacking equipment.

[0107] In one embodiment, the opposite number of the correction value may be input into the lamination device to correct the lamination device.

[0108] According to an embodiment of the present invention, on the other hand, Figure 2 As shown, a lamination device is also provided, which mainly includes: an acquisition module 100, a calculation module 200, a processing module 300, a comparison module 400 and a correction module 500.

[0109] Specifically, the acquisition module 100, in response to a correction request, obtains the position relationship data of the pole piece group, the pole piece group includes N layers of pole piece units 1, each pole piece unit 1 includes at least partially overlapping positive pole pieces 2 and negative pole pieces 3, and each pole piece unit 1 has corresponding position relationship parameters. The calculation module 200, for each pole piece unit 1, calculates the deviation number set of the pole piece unit 1 based on the corresponding position relationship parameters, the deviation number set includes an angle deviation value and at least one preset direction deviation value. The processing module 300 processes the deviation number set corresponding to no less than one pole piece unit 1 to obtain the deviation mean corresponding to the pole piece group. The comparison module 400 compares the deviation mean obtained by the processing module 300 with the size of the preset range to determine the correction value. The correction module 500 corrects the lamination equipment according to the correction value determined by the comparison module 400.

[0110] It can be seen that the stacking equipment provided by the embodiment of the present invention obtains the position relationship parameters of the positive electrode sheet 2 and the negative electrode sheet 3 of each layer of the electrode sheet unit 1, calculates the deviation number set of the electrode sheet unit 1 through the position relationship parameters, and the deviation number set includes an angle deviation value and at least one preset direction deviation value, and statistically processes the deviation mean of the deviation number set, and then determines the angle and preset direction correction value according to the deviation mean and the preset range, and finally corrects the stacking equipment according to the correction value, and can calculate the degree of deviation between the positive electrode sheet 2 and the negative electrode sheet 3 of each layer of the electrode sheet unit 1 of the stacking equipment in real time, and automatically corrects the deviation according to the degree of deviation to form a closed-loop control compensation action, thereby improving the correction accuracy and reliability of the stacking equipment, and is conducive to improving the qualified rate of the battery cell.

[0111] Specifically, the stacking equipment includes but is not limited to a Z stacking machine, a feeding stacking machine, etc. Taking the feeding stacking machine as an example, the feeding stacking machine is usually provided with a positive electrode mechanical type and a negative electrode manipulator to stack the positive electrode sheet 2 and the negative electrode sheet 3 respectively, and the correction can be achieved by adjusting the stacking positions of the positive electrode mechanical type and the negative electrode manipulator according to the correction value.

[0112] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A deviation correction method for a lamination device, characterized in that: include: In response to a correction request, positional relationship data of a pole piece group is acquired, the pole piece group comprising N pole piece units (1), each pole piece unit (1) comprising a positive pole piece (2) and a negative pole piece (3) that at least partially overlap, and each pole piece unit (1) having a corresponding positional relationship parameter; For each of the pole piece units (1), a deviation number set of the pole piece unit (1) is calculated based on the corresponding position relationship parameter, wherein the deviation number set includes an angle deviation value and at least one preset direction deviation value; Processing the deviation number set corresponding to at least one of the pole piece units (1) to obtain the deviation mean value corresponding to the pole piece group; Determine a deviation correction value based on the deviation from the mean value and the preset range; The lamination equipment is skew-corrected according to the skew-correction value.

2. The deviation correction method of the lamination equipment according to claim 1, characterized in that: The step of obtaining the position relationship data of the electrode group includes: The position relationship parameters of the positive electrode coating area (201) and the positive electrode ear area (202) of the positive electrode sheet (2) and the negative electrode coating area (301) and the negative electrode ear area (302) of the negative electrode sheet (3) of each layer of the electrode sheet unit (1) are obtained.

3. The deviation correction method of the lamination equipment according to claim 2, characterized in that: The step of obtaining positional relationship parameters between the positive electrode coating area (201) and the positive electrode ear area (202) of the positive electrode sheet (2) and the negative electrode coating area (301) and the negative electrode ear area (302) of the negative electrode sheet (3) of each layer of the electrode sheet unit (1) comprises: Obtaining a first interval g1 between the positive electrode ear region (202) and the negative electrode coating region (301) in the first direction, a second interval g2 between the positive electrode coating region (201) and the negative electrode coating region (301) on one side of the first direction, and a width L of the positive electrode coating region (201), wherein the first interval g1 and the second interval g2 are arranged opposite to each other in the second direction; The calculation formula of the angle deviation value θ is as follows: θ=arctan((g1-g2) / L).

4. The deviation correction method of the lamination equipment according to claim 3, characterized in that: The step of obtaining positional relationship parameters between the positive electrode coating area (201) and the positive electrode ear area (202) of the positive electrode sheet (2) and the negative electrode coating area (301) and the negative electrode ear area (302) of the negative electrode sheet (3) of each layer of the electrode sheet unit (1) further includes: Obtaining a third gap g3 between the positive electrode coating area (201) and the negative electrode coating area (301) on the other side of the first direction, wherein the third gap g3 and the second gap g2 are arranged opposite to each other in the first direction; The preset direction deviation value includes a first direction deviation value x, and the calculation formula of the first direction deviation value x is as follows: x=(g2-g3) / 2.

5. The deviation correction method of the lamination equipment according to claim 3, characterized in that: The step of obtaining positional relationship parameters between the positive electrode coating area (201) and the positive electrode ear area (202) of the positive electrode sheet (2) and the negative electrode coating area (301) and the negative electrode ear area (302) of the negative electrode sheet (3) of each layer of the electrode sheet unit (1) further includes: Obtaining a fourth interval k1 and a fifth interval k2 between the positive electrode coating area (201) and the negative electrode coating area (301) in the second direction, wherein the fourth interval k1 and the fifth interval k2 are arranged opposite to each other in the second direction; The preset direction deviation value includes a second direction deviation value y, and the calculation formula of the second direction deviation value y is as follows y=(k1-k2) / 2.

6. The deviation correction method for a lamination device according to any one of claims 1 to 5, characterized in that: The step of processing the deviation number set corresponding to at least one of the pole piece units (1) to obtain the deviation mean value corresponding to the pole piece group comprises: Eliminate a preset number of maximum and minimum values ​​in the deviation number set, and calculate the mean of the remaining values ​​of the deviation number set to obtain the deviation mean.

7. The deviation correction method for a lamination device according to any one of claims 1 to 5, characterized in that: The step of determining the deviation correction value based on the deviation from the mean value and the preset range includes: When the absolute value of the deviation from the mean is less than the preset range, the deviation correction value = 0; When the absolute value of the deviation from the mean is within a preset range, the deviation correction value = the deviation from the mean; When the absolute value of the deviation from the mean is greater than the preset range and the deviation from the mean is a positive value, the correction value = the maximum value of the preset range; when the absolute value of the deviation from the mean is greater than the preset range and the deviation from the mean is a negative value, the correction value = - the maximum value of the preset range.

8. The deviation correction method for a lamination device according to any one of claims 1 to 5, characterized in that: Before the step of correcting the lamination device according to the correction value, the method further includes: Based on the positional relationship parameters corresponding to each of the pole piece units (1), a deviation correction condition value corresponding to the pole piece group is calculated, wherein the deviation correction condition value includes at least one of a range, a variance and a mean difference; The deviation correction condition value is judged according to a preset condition, and it is determined that the deviation correction condition value meets the preset condition.

9. The deviation correction method for a lamination device according to any one of claims 1 to 5, characterized in that: The step of correcting the lamination device according to the correction value comprises: The opposite number of the deviation correction value is input into the lamination device to correct the deviation of the lamination device.

10. A lamination device, characterized in that: include: An acquisition module (100) acquires positional relationship data of a pole piece group in response to a deviation correction request, the pole piece group comprising N pole piece units (1), each pole piece unit (1) comprising a positive pole piece (2) and a negative pole piece (3) that at least partially overlap, and each pole piece unit (1) having a corresponding positional relationship parameter; A calculation module (200) calculates, for each of the pole piece units (1), a deviation number set of the pole piece unit (1) based on corresponding position relationship parameters, the deviation number set comprising an angle deviation value and at least one preset direction deviation value; A processing module (300) processes a deviation number set corresponding to at least one of the pole piece units (1) to obtain a deviation mean value corresponding to the pole piece group; A comparison module (400) compares the deviation mean value obtained by the processing module (300) with a preset range to determine a deviation correction value; A deviation correction module (500) is used to correct the deviation of the lamination device according to the deviation correction value determined by the comparison module (400).

Images