An automated production method for new energy lithium-ion fast charging battery cells

Abstract

The present invention relates to the technical field of manufacturing rechargeable batteries, and in particular to an automated production method for new energy lithium-ion fast charging batteries. The present invention winds an electrode sheet coated with fluorescent material on a tab and a diaphragm to obtain a bare battery cell, and calculates the difference in regional fluorescence intensity of each tab distribution sub-region by obtaining a preset excitation light in a first preset irradiation direction for the regional fluorescence intensity of different tab distribution sub-regions to determine whether the consistency of the tab shape is qualified, and determines the affected category of the tab shape by the proportion of the number of tab morphology abnormal sub-regions, and selects an adjustment method for hot pressing the bare battery cell, including adjusting the pressure value for hot pressing each tab morphology abnormal sub-region, or adjusting the hot pressing time for hot pressing the bare battery cell as a whole, thereby realizing rapid identification of winding abnormal areas according to tab morphology differences, and adaptively adjusting production parameters to improve the quality of rapid cell production.

Description

Technical Field

[0001] The present invention relates to the technical field of rechargeable battery cell manufacturing, and in particular to an automated production method for new energy lithium-ion fast-charging battery cells. Background Art

[0002] With the rapid development of the global economy, the demand for energy continues to grow. New energy lithium-ion fast-charging cells are of great strategic significance today. They play an important role in the storage, utilization and promotion of clean energy. In the automated production method of new energy lithium-ion fast-charging cells, the winding process is an important part of the production process. During the winding process, due to factors such as process tension, the bare cell may be deformed, the diaphragm wrinkled, internal air residue and poor thickness consistency, which in turn affects the distribution morphology of the pole ear. In addition, the difference in the winding and bonding uniformity of the electrode sheet will affect the hot pressing shaping of the bare cell and affect the lithium ion transmission. Therefore, the rapid detection of the winding and bonding uniformity of the electrode sheet in the automated production process of the cell is a technical problem that needs to be solved urgently.

[0003] For example, the Chinese patent publication number: CN117657859A, the invention discloses a battery cell winding correction control device and control method, the device includes: a visual inspection system, which is used to collect the pole piece-diaphragm image during the winding process of multiple pole pieces and multiple diaphragms, and process and analyze the pole piece-diaphragm image based on the baseline to obtain the coating amount between different pole pieces, the coating amount between different diaphragms, and the coating amount between the pole piece and the diaphragm; a correction closed-loop control system, which is used to determine whether the obtained multiple coating amounts exceed the preset threshold value. If any coating amount exceeds the preset threshold value, any pole piece or any diaphragm is used as a reference to control the movement of other pole pieces and diaphragms for correction. The invention calculates the coating amount between the pole piece and the diaphragm in the battery cell winding according to the same baseline, which can improve the measurement accuracy of the coating amount.

[0004] The prior art still has the following problems:

[0005] The existing technology does not take into account that the wrinkles of the diaphragm and the internal air residue in the rapid winding production of lithium-ion rechargeable batteries will affect the shape of the tabs connected to the electrode sheets. The existing technology cannot quickly identify and detect tabs with different shapes, and cannot adaptively adjust production parameters for bare batteries with tabs with abnormal shapes. Summary of the invention

[0006] To this end, the present invention provides an automated production method for new energy lithium-ion fast charging cells to overcome the problems that the prior art cannot quickly identify and detect tabs with different shapes, and cannot adaptively adjust production parameters for bare cells with tabs with abnormal shapes.

[0007] To achieve the above object, the present invention provides an automated production method for new energy lithium-ion fast charging cells, comprising:

[0008] Coating fluorescent material on each electrode tab of the electrode sheet so that each electrode tab exhibits the same fluorescence intensity under the irradiation of a preset excitation light;

[0009] Winding the electrode sheet and the separator to obtain a bare cell, dividing the tab distribution area of ​​the bare cell into a plurality of tab distribution sub-areas, obtaining the regional fluorescence intensity of the preset excitation light in different tab distribution sub-areas in a first preset irradiation direction, and determining whether the consistency of the tab morphology is qualified according to the difference in the regional fluorescence intensity of each tab distribution sub-area;

[0010] In response to the unqualified consistency of the lug morphology, the lug morphology abnormal sub-regions are screened according to the regional fluorescence intensity of each lug distribution sub-region, and the affected category of the lug morphology is determined based on the number ratio of the lug morphology abnormal sub-regions;

[0011] The adjustment method for hot pressing the bare cell is selected based on the different affected categories of the tab morphology, including:

[0012] Adjust the pressure value for hot pressing each tab morphology abnormal sub-region;

[0013] Alternatively, the regional fluorescence intensity of the preset excitation light in different tab distribution sub-regions is obtained in a second preset irradiation direction, and the hot pressing time for the entire bare cell is adjusted according to the change in the regional fluorescence intensity of each tab morphology abnormal sub-region.

[0014] Furthermore, the process of dividing the plurality of tab distribution sub-areas includes:

[0015] Determine the regional center point of the tab distribution area of ​​the bare battery cell, and divide the tab distribution area into a plurality of tab distribution sub-areas with the regional center point as the symmetry center.

[0016] Furthermore, the first preset irradiation direction is perpendicular to the plane where the tab distribution area is located and is aligned with the center point of the area.

[0017] Furthermore, the process of determining the regional fluorescence intensity difference of each lug distribution sub-region includes:

[0018] The maximum regional fluorescence intensity and the minimum regional fluorescence intensity are determined according to the regional fluorescence intensity of each pole ear distribution sub-region, and the fluorescence intensity difference between the maximum regional fluorescence intensity and the minimum regional fluorescence intensity is calculated.

[0019] Furthermore, the process of determining whether the consistency of the tab shape is qualified includes:

[0020] Comparing the fluorescence intensity difference with a preset fluorescence intensity difference threshold;

[0021] If the fluorescence intensity difference is greater than the fluorescence intensity difference threshold, it is determined that the consistency of the tab morphology is unqualified.

[0022] Furthermore, the process of screening the sub-regions with abnormal ear morphology includes:

[0023] Comparing the regional fluorescence intensity of each tab distribution sub-region with a preset first fluorescence intensity reference value and a preset second fluorescence intensity reference value;

[0024] If the regional fluorescence intensity is greater than the first fluorescence intensity reference value, or the regional fluorescence intensity is less than the second fluorescence intensity reference value, the tab distribution sub-region corresponding to the regional fluorescence intensity is screened as a tab morphology abnormal sub-region.

[0025] Furthermore, the process of determining the affected category of the tab morphology includes:

[0026] Calculating the ratio of the number of the tab morphology abnormal sub-regions to the number of the tab distribution sub-regions, and comparing the ratio with a preset ratio reference value;

[0027] If the ratio is less than or equal to the ratio reference value, it is determined that the affected category of the electrode tab morphology is the affected concentrated performance category;

[0028] If the ratio is greater than the ratio reference value, it is determined that the category in which the electrode tab morphology is affected is a category that affects the dispersion performance.

[0029] Furthermore, the process of selecting an adjustment method for hot pressing the bare battery cell includes:

[0030] If the affected category of the electrode tab morphology is the concentrated impact category, the pressure value of hot pressing for each abnormal tab morphology sub-region is adjusted;

[0031] If the affected category of the electrode sheet tab morphology is the category that affects the dispersion performance, the regional fluorescence intensity of the preset excitation light in different tab distribution sub-areas with a second preset irradiation direction is obtained, and the hot pressing time of the bare battery cell as a whole is adjusted according to the change of the regional fluorescence intensity of each tab morphology abnormal sub-area.

[0032] Furthermore, the process of adjusting the pressurization pressure value includes:

[0033] In response to the regional fluorescence intensity of the abnormal ear morphology sub-region being greater than the first fluorescence intensity reference value, adjusting the pressurization pressure value of the abnormal ear morphology sub-region according to the absolute value of the difference between the regional fluorescence intensity and the first fluorescence intensity reference value, wherein the pressurization pressure value is positively correlated with the absolute value of the difference;

[0034] In response to the regional fluorescence intensity of the abnormal ear morphology sub-region being less than the second fluorescence intensity reference value, the pressurized pressure value of the abnormal ear morphology sub-region is adjusted according to the absolute value of the difference between the regional fluorescence intensity and the second fluorescence intensity reference value, and the pressurized pressure value is positively correlated with the absolute value of the difference.

[0035] Furthermore, the process of adjusting the hot pressing time of the entire bare cell includes:

[0036] Calculate the average of the absolute values ​​of the differences between the fluorescence intensity of the region irradiated by the preset excitation light in the first preset irradiation direction and the fluorescence intensity of the region irradiated by the second preset irradiation direction for each sub-region with abnormal apico morphology;

[0037] The hot pressing time for hot pressing the entire bare cell is adjusted according to the average value of the absolute value of the difference, and the hot pressing time is positively correlated with the average value of the absolute value of the difference.

[0038] Compared with the prior art, the beneficial effect of the present invention lies in that, in the present invention, an electrode sheet coated with fluorescent material on the tab is wound with a diaphragm to obtain a bare battery cell, and the regional fluorescence intensity difference of each tab distribution sub-region is calculated by obtaining a preset excitation light in a first preset irradiation direction for the regional fluorescence intensity of different tab distribution sub-regions to determine whether the consistency of the tab shape is qualified, and the affected category of the tab shape is determined by screening the abnormal tab shape sub-regions and based on the number ratio of the abnormal tab shape sub-regions, and the adjustment method for hot pressing the bare battery cell is selected according to the different affected categories of the tab shape, including adjusting the pressure value for hot pressing each tab shape abnormal sub-region, or adjusting the hot pressing time for hot pressing the bare battery cell as a whole, thereby realizing rapid identification and detection of tabs with different shapes, rapid identification of winding abnormal areas according to the differences in tab shapes, and adaptive adjustment of production parameters to improve the quality of rapid production of battery cells.

[0039] Furthermore, the present invention coats the electrode tabs with fluorescent material, and uses preset excitation light to detect the regional fluorescence intensity of the tab distribution sub-areas. Those skilled in the art will understand that if the difference in fluorescence intensity of each tab distribution sub-area is small, it means that the morphology of the tabs at different positions is relatively consistent, and the excitation conditions of the fluorescent material are similar. Conversely, if the fluorescence intensity of individual tab distribution sub-areas is significantly higher or lower than that of other tab distribution sub-areas, it means that the tab morphology within these tab distribution sub-areas may be different, resulting in differences in the excitation conditions of the fluorescent material. By comparing the regional fluorescence intensities of different tab distribution sub-areas, the consistency of the tab morphology can be accurately judged. This method can detect extremely subtle morphological differences and achieve rapid identification and detection of tabs with different morphologies.

[0040] Furthermore, the present invention screens out sub-regions with abnormal lug morphology according to the regional fluorescence intensity, and determines the affected category of the lug morphology according to the proportion of the number of sub-regions with abnormal lug morphology. The problems of inconsistent lug morphology can be classified, and the abnormal winding area can be quickly identified according to the difference in lug morphology, so as to more accurately understand the problem distribution type of lug morphology problems.

[0041] Furthermore, under the condition that the number of sub-regions with abnormal lug morphology is small, the present invention can individually adjust the pressurization pressure value for hot pressing for each sub-region with abnormal lug morphology, so as to more accurately improve the lug morphology differences in these regions caused by diaphragm wrinkles and internal air residue, and make the lug morphology in the entire battery cell tend to be consistent, thereby significantly improving the flatness of the diaphragm inside the wound bare battery cell, realizing rapid identification of winding abnormal areas according to lug morphology differences, and adaptively adjusting production parameters to improve the quality of rapid production of battery cells.

[0042] Furthermore, under the condition that there are a large number of abnormal lug morphology sub-regions, the present invention can adjust the hot pressing time of the bare cell as a whole according to the change in regional fluorescence intensity of each lug morphology sub-region by changing the irradiation direction of the preset excitation light, and according to the change in regional fluorescence intensity of each lug morphology sub-region. Those skilled in the art will understand that when the irradiation direction of the excitation light is changed, the degree of difference in the excitation of the fluorescent substances on the lugs with different morphologies is inconsistent, resulting in a large change in the overall excited fluorescence intensity. The present invention extends the hot pressing time of the bare cell as a whole according to the average value of the absolute value of the difference in the change in regional fluorescence intensity of each lug morphology sub-region under different irradiation directions, which can make the diaphragm wound inside the entire bare cell smoother, realize the rapid identification of winding abnormal areas according to the difference in lug morphology, and adaptively adjust the production parameters to improve the quality of rapid production of cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1This is a step diagram of an automated production method for new energy lithium-ion fast charging cells according to an embodiment of the present invention;

[0044] Figure 2 A logic flow chart for determining whether the consistency of the tab shape is qualified according to an embodiment of the present invention;

[0045] Figure 3 A logic flow chart for determining the affected category of the tab morphology according to an embodiment of the present invention;

[0046] Figure 4 A logic flow chart for selecting an adjustment method for hot pressing the bare cell according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0049] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0050] See also Figure 1 As shown, it is a step diagram of an automated production method for new energy lithium-ion fast charging batteries according to an embodiment of the present invention. An automated production method for new energy lithium-ion fast charging batteries according to the present invention comprises:

[0051] Step S100, coating each tab of the electrode sheet with a fluorescent substance so that each tab exhibits the same fluorescence intensity under the irradiation of a preset excitation light;

[0052] Step S200, winding the electrode sheet and the diaphragm to obtain a bare cell, dividing the tab distribution area of ​​the bare cell into a plurality of tab distribution sub-areas, obtaining the regional fluorescence intensity of the preset excitation light in different tab distribution sub-areas in a first preset irradiation direction, and determining whether the consistency of the tab morphology is qualified according to the difference in the regional fluorescence intensity of each tab distribution sub-area;

[0053] Step S300, in response to the tab morphology consistency being unqualified, screening tab morphology abnormal sub-regions according to the regional fluorescence intensity of each tab distribution sub-region, and determining the affected category of the tab morphology based on the number ratio of the tab morphology abnormal sub-regions;

[0054] Step S400, selecting an adjustment method for hot pressing the bare cell based on different affected categories of the tab morphology, including:

[0055] Adjust the pressure value for hot pressing each tab morphology abnormal sub-region;

[0056] Alternatively, the regional fluorescence intensity of the preset excitation light in different tab distribution sub-regions is obtained in a second preset irradiation direction, and the hot pressing time for the entire bare cell is adjusted according to the change in the regional fluorescence intensity of each tab morphology abnormal sub-region.

[0057] Specifically, the winding process of the electrode sheet of the full-tab battery cell first needs to determine the winding order of the positive and negative electrode sheets and the separator. Preferably, the winding order can be the positive electrode sheet, the separator, and the negative electrode sheet in sequence. The winding process of the electrode sheet is an existing technology in the battery cell manufacturing process and will not be repeated here.

[0058] Specifically, the fluorescent substance coated on the tabs of each electrode sheet can be an organic fluorescent dye, and the organic fluorescent dye can be evenly sprayed on the tabs of each electrode sheet in advance so that the tabs of each electrode sheet show the same fluorescence intensity under the irradiation of the same excitation light. Organic fluorescent dyes include fluorescein and rhodamine dyes. Organic fluorescent dyes are widely used in biomedicine, materials science and semiconductor manufacturing fields, which will not be elaborated here.

[0059] Specifically, those skilled in the art can select corresponding excitation light according to the absorption spectrum characteristics of the organic fluorescent dye used, so that the wavelength of the excitation light matches the absorption peak of the dye to ensure maximum excitation of the dye molecules to produce a strong fluorescence intensity. Preferably, a blue light source with stable emission can be selected as the excitation light.

[0060] Specifically, the regional fluorescence intensity of each pole ear distribution sub-region can be collected by a photoelectric detector set at the pole ear distribution position after winding, and the received fluorescence signal can be converted into an electrical signal. This is a prior art and will not be described in detail here.

[0061] Specifically, the process of dividing several tab distribution sub-areas includes:

[0062] Determine the regional center point of the tab distribution area of ​​the bare battery cell, and divide the tab distribution area into a plurality of tab distribution sub-areas with the regional center point as the symmetry center.

[0063] Specifically, the lug distribution area of ​​the bare battery cell can be divided into a number of centrally symmetrical lug distribution sub-areas at a preset interval angle based on the center point of the area. The preset interval angle can be pre-set according to the size of the required divided area. Preferably, the preset interval angle can be 60°, that is, the lug distribution area is equally divided into 6 lug distribution sub-areas.

[0064] Specifically, the first preset irradiation direction is perpendicular to the plane where the tab distribution area is located and is aligned with the center point of the area.

[0065] Those skilled in the art will understand that, when the excitation light is emitted from the center point of the alignment area, the excitation light intensity received by each lug distribution sub-area in the lug distribution area of ​​the bare cell can be uniform, making it easier to quickly identify lugs with different morphologies by comparing the differences in regional fluorescence intensity of each lug distribution sub-area.

[0066] Specifically, the process of determining the regional fluorescence intensity difference of each ear distribution sub-region includes:

[0067] Determine the maximum regional fluorescence intensity F according to the regional fluorescence intensity of each tab distribution sub-region max and the minimum regional fluorescence intensity F min , calculate the fluorescence intensity difference Fc between the maximum area fluorescence intensity and the minimum area fluorescence intensity, Fc=F max -F min .

[0068] Specifically, it can be understood that the regional fluorescence intensity is the fluorescence intensity emitted by the organic fluorescent dye coated on the electrode tabs in each tab distribution sub-region under the irradiation of the preset excitation light.

[0069] Specifically, see Figure 2 As shown, it is a logic flow chart for determining whether the consistency of the tab shape is qualified in an embodiment of the present invention. The process of determining whether the consistency of the tab shape is qualified includes:

[0070] The fluorescence intensity difference Fc is compared with the preset fluorescence intensity difference threshold Fc 0 Make a comparison;

[0071] If the fluorescence intensity difference Fc is less than or equal to the fluorescence intensity difference threshold Fc 0 , then the consistency of the tab shape is determined to be qualified;

[0072] If the fluorescence intensity difference Fc is greater than the fluorescence intensity difference threshold Fc 0 , then the consistency of the lug shape is judged to be unqualified.

[0073] Specifically, the preset fluorescence intensity difference threshold Fc0 For those skilled in the art to determine the fluorescence intensity difference threshold Fc according to the size of the pole ear distribution sub-region, the average value of the fluorescence intensity difference between several pole ear distribution sub-regions of the same size can be pre-tested and calculated, and the calculated average value of the fluorescence intensity difference can be determined as the fluorescence intensity difference threshold Fc 0 .

[0074] Specifically, the present invention coats the electrode tabs with fluorescent substances, and uses preset excitation light to detect the regional fluorescence intensity of the tab distribution sub-areas. Those skilled in the art will understand that if the difference in fluorescence intensity of each tab distribution sub-area is small, it means that the morphology of the tabs at different positions is relatively consistent, and the excitation conditions of the fluorescent substances are similar. Conversely, if the fluorescence intensity of individual tab distribution sub-areas is significantly higher or lower than that of other tab distribution sub-areas, it means that the tab morphology within these tab distribution sub-areas may be different, resulting in differences in the excitation conditions of the fluorescent substances. By comparing the regional fluorescence intensities of different tab distribution sub-areas, the consistency of the tab morphology can be accurately judged. This method can detect extremely subtle morphological differences and achieve rapid identification and detection of tabs with different morphologies.

[0075] Specifically, the process of screening the sub-regions with abnormal ear morphology includes:

[0076] The regional fluorescence intensity F of each tab distribution sub-region is compared with the preset first fluorescence intensity reference value F 1 and a preset second fluorescence intensity reference value F 2 Make a comparison;

[0077] If the fluorescence intensity F of the region is less than or equal to the first fluorescence intensity reference value F 1 , and the regional fluorescence intensity F is greater than or equal to the second fluorescence intensity reference value F 2 , then the polar ear distribution sub-region corresponding to the fluorescence intensity of the region is not screened;

[0078] If the fluorescence intensity F of the region is greater than the first fluorescence intensity reference value F 1 , or the regional fluorescence intensity F is less than the second fluorescence intensity reference value F 2 , then the ear distribution sub-region corresponding to the fluorescence intensity of the region is screened as the ear morphology abnormal sub-region.

[0079] Specifically, the preset first fluorescence intensity reference value F 1 and a preset second fluorescence intensity reference value F 2 It can be determined based on historical data calculations, and the average value Fav of the regional fluorescence intensity collected from the same fluorescent substance under the same excitation light illumination of several ear distribution sub-areas of the same size can be calculated in advance. Preferably, the first fluorescence intensity reference value F can be set1 =1.1×Fav, the second fluorescence intensity reference value F 2 =0.9×Fav.

[0080] Specifically, see Figure 3 As shown, it is a logic flow chart of determining the affected category of the tab shape according to an embodiment of the present invention. The process of determining the affected category of the tab shape includes:

[0081] Calculate the number n of abnormal sub-regions of the ear morphology 1 The number of tab distribution sub-areas n 2 The ratio k, k=n 1 / n 2 , the ratio k is compared with the preset ratio reference value k a Make a comparison;

[0082] If the ratio k is less than or equal to the ratio reference value k a , then the affected category of the electrode tab morphology is determined to be the affected concentrated performance category;

[0083] If the ratio k is greater than the ratio reference value k a , then the category of electrode tab morphology affected is determined to be the category that affects dispersion performance.

[0084] Specifically, it can be understood that the preset ratio reference value k a Different, the standards for determining the affected categories of electrode tab morphology are different. Those skilled in the art can compare the reference value k according to actual judgment needs. a Preset, preferably, a preset ratio reference value k a The value range is [0.1, 0.3].

[0085] Specifically, the present invention screens out sub-regions with abnormal lug morphology according to the regional fluorescence intensity, and determines the affected category of the lug morphology according to the proportion of the number of sub-regions with abnormal lug morphology. The problems of inconsistent lug morphology can be classified, and the abnormal winding area can be quickly identified according to the difference in lug morphology, so as to more accurately understand the problem distribution type of lug morphology problems.

[0086] Specifically, see Figure 4 As shown, it is a logic flow chart of selecting an adjustment method for hot pressing the bare cell according to an embodiment of the present invention. The process of selecting an adjustment method for hot pressing the bare cell includes:

[0087] If the affected category of the electrode tab morphology is the concentrated impact category, the pressure value of hot pressing for each abnormal tab morphology sub-region is adjusted;

[0088] If the affected category of the electrode sheet tab morphology is the category that affects the dispersion performance, the regional fluorescence intensity of the preset excitation light in different tab distribution sub-areas with a second preset irradiation direction is obtained, and the hot pressing time of the bare battery cell as a whole is adjusted according to the change of the regional fluorescence intensity of each tab morphology abnormal sub-area.

[0089] Specifically, under the condition that the number of sub-regions with abnormal lug morphology is small, the present invention can individually adjust the pressurization pressure value for hot pressing for each sub-region with abnormal lug morphology, so as to more accurately improve the lug morphology differences in these regions caused by diaphragm wrinkles and internal air residue, and make the lug morphology in the entire battery cell tend to be consistent, thereby significantly improving the flatness of the diaphragm inside the wound bare battery cell, realizing rapid identification of winding abnormal areas according to lug morphology differences, and adaptively adjusting production parameters to improve the quality of rapid production of battery cells.

[0090] Specifically, the process of adjusting the pressurization pressure value includes:

[0091] In response to the regional fluorescence intensity F of the abnormal ear morphology sub-region being greater than the first fluorescence intensity reference value F 1 , adjusting the pressurization pressure value of the tab abnormal morphology sub-region according to the absolute value Fa of the difference between the fluorescence intensity of the region and the first fluorescence intensity reference value, wherein the pressurization pressure value is positively correlated with the absolute value Fa of the difference;

[0092] Where Fa=|F-F 1 |;

[0093] Those skilled in the art can understand that, the larger the absolute value Fa of the difference between the abnormal lug morphology sub-region and the first fluorescence intensity reference value, the greater the morphological difference of the lug caused by the diaphragm wrinkles and internal air residue in the rapid winding production of the battery cell, and the need to increase the pressurization pressure value for hot pressing the abnormal lug morphology sub-region. A higher pressurization pressure value can make the diaphragm and electrode sheet fit more closely and discharge the residual air inside, thereby improving the quality of rapid production of battery cells.

[0094] In response to the regional fluorescence intensity F of the abnormal ear morphology sub-region being less than the second fluorescence intensity reference value F 2 , adjusting the pressure value of the tab abnormal morphology sub-region according to the absolute value Fb of the difference between the fluorescence intensity of the region and the second fluorescence intensity reference value, wherein the pressure value is positively correlated with the absolute value Fb of the difference;

[0095] Where, Fb=|F-F 2 |;

[0096] Those skilled in the art can understand that, the larger the absolute value Fb of the difference between the abnormal lug morphology sub-region and the second fluorescence intensity reference value, the greater the morphological difference of the lug caused by the diaphragm wrinkles and internal air residue in the rapid winding production of the battery cell, and the need to increase the pressurization pressure value for hot pressing the abnormal lug morphology sub-region. A higher pressurization pressure value can make the diaphragm and the electrode sheet fit more closely and discharge the residual air inside, thereby improving the quality of rapid production of the battery cell.

[0097] Specifically, the process of adjusting the hot pressing time of the entire bare cell includes:

[0098] Calculate the average value Fu of the absolute value of the difference between the regional fluorescence intensity of each tab abnormal morphology sub-region irradiated by the preset excitation light in the first preset irradiation direction and the regional fluorescence intensity irradiated in the second preset irradiation direction,

[0099] ;

[0100] Among them, F i is the regional fluorescence intensity of the i-th auricle morphological abnormal sub-region irradiated by the preset excitation light in the first preset irradiation direction, F' i is the regional fluorescence intensity of the i-th auricle morphology abnormal sub-region irradiated by the preset excitation light in the second preset irradiation direction, i=1,2,3…n, n is the number of auricle morphology abnormal sub-regions.

[0101] The hot pressing time for hot pressing the entire bare cell is adjusted according to the average value of the absolute value of the difference, and the hot pressing time is positively correlated with the average value Fu of the absolute value of the difference.

[0102] Specifically, the second preset irradiation direction can be an irradiation direction in which the preset excitation light is moved a preset distance on the basis of the first preset irradiation direction to irradiate each lug distribution sub-area again. It can be understood that, based on the first preset irradiation direction, the greater the preset distance moved, that is, the greater the change in the irradiation direction of the preset excitation light. Preferably, the irradiation direction of the preset excitation light aimed at the edge of the lug distribution area of ​​the bare cell can be used as the second preset irradiation direction of the preset excitation light.

[0103] Specifically, under the condition that there are a large number of abnormal lug morphology sub-regions, the present invention can adjust the hot pressing time of the bare cell as a whole according to the change in regional fluorescence intensity of each abnormal lug morphology sub-region by changing the irradiation direction of the preset excitation light. Those skilled in the art can understand that when the irradiation direction of the excitation light is changed, the degree of difference in the excitation of the fluorescent substances on the lugs with different morphologies is inconsistent, resulting in a large change in the overall excited fluorescence intensity. The present invention extends the hot pressing time of the bare cell as a whole according to the average value of the absolute value of the difference in the change in regional fluorescence intensity of each abnormal lug morphology sub-region under different irradiation directions, which can make the diaphragm wound inside the entire bare cell smoother, realize the rapid identification of abnormal winding areas according to the differences in lug morphology, and adaptively adjust the production parameters to improve the quality of rapid production of cells.

[0104] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automated production method for new energy lithium-ion fast charging batteries, characterized in that: include: Coating fluorescent material on each electrode tab of the electrode sheet so that each electrode tab exhibits the same fluorescence intensity under the irradiation of a preset excitation light; Winding the electrode sheet and the separator to obtain a bare cell, dividing the tab distribution area of ​​the bare cell into a plurality of tab distribution sub-areas, obtaining the regional fluorescence intensity of the preset excitation light in different tab distribution sub-areas in a first preset irradiation direction, and determining whether the consistency of the tab morphology is qualified according to the difference in the regional fluorescence intensity of each tab distribution sub-area; In response to the unqualified consistency of the lug morphology, the lug morphology abnormal sub-regions are screened according to the regional fluorescence intensity of each lug distribution sub-region, and the affected category of the lug morphology is determined based on the number ratio of the lug morphology abnormal sub-regions; The adjustment method for hot pressing the bare cell is selected based on the different affected categories of the tab morphology, including: Adjust the pressure value for hot pressing each tab morphology abnormal sub-region; Alternatively, the regional fluorescence intensity of the preset excitation light in different tab distribution sub-regions is obtained in a second preset irradiation direction, and the hot pressing time for the entire bare cell is adjusted according to the change in the regional fluorescence intensity of each tab morphology abnormal sub-region.

2. The automated production method for new energy lithium-ion fast charging batteries according to claim 1, characterized in that: The process of dividing several tab distribution sub-areas includes: Determine the regional center point of the tab distribution area of ​​the bare battery cell, and divide the tab distribution area into a plurality of tab distribution sub-areas with the regional center point as the symmetry center.

3. The automated production method for new energy lithium-ion fast charging batteries according to claim 2, characterized in that: The first preset irradiation direction is perpendicular to the plane where the tab distribution area is located and is aligned with the center point of the area.

4. The automated production method for new energy lithium-ion fast charging batteries according to claim 1, characterized in that: The process of determining the regional fluorescence intensity differences of each tab distribution sub-region includes: The maximum regional fluorescence intensity and the minimum regional fluorescence intensity are determined according to the regional fluorescence intensity of each pole ear distribution sub-region, and the fluorescence intensity difference between the maximum regional fluorescence intensity and the minimum regional fluorescence intensity is calculated.

5. The automated production method for new energy lithium-ion fast charging batteries according to claim 4, characterized in that: The process of determining whether the consistency of the tab shape is qualified includes: Comparing the fluorescence intensity difference with a preset fluorescence intensity difference threshold; If the fluorescence intensity difference is greater than the fluorescence intensity difference threshold, it is determined that the consistency of the tab morphology is unqualified.

6. The automated production method for new energy lithium-ion fast charging cells according to claim 5, characterized in that: The process of screening the sub-regions with abnormal ear morphology includes: Comparing the regional fluorescence intensity of each tab distribution sub-region with a preset first fluorescence intensity reference value and a preset second fluorescence intensity reference value; If the regional fluorescence intensity is greater than the first fluorescence intensity reference value, or the regional fluorescence intensity is less than the second fluorescence intensity reference value, the tab distribution sub-region corresponding to the regional fluorescence intensity is screened as a tab morphology abnormal sub-region.

7. The automated production method for new energy lithium-ion fast charging cells according to claim 6, characterized in that: The process of determining the affected category of the tab morphology includes: Calculating the ratio of the number of the tab morphology abnormal sub-regions to the number of the tab distribution sub-regions, and comparing the ratio with a preset ratio reference value; If the ratio is less than or equal to the ratio reference value, it is determined that the affected category of the electrode tab morphology is the affected concentrated performance category; If the ratio is greater than the ratio reference value, it is determined that the category in which the electrode tab morphology is affected is a category that affects the dispersion performance.

8. The automated production method for new energy lithium-ion fast charging cells according to claim 7, characterized in that: The process of selecting an adjustment method for hot pressing the bare cell includes: If the affected category of the electrode tab morphology is the concentrated impact category, the pressure value of hot pressing for each abnormal tab morphology sub-region is adjusted; If the affected category of the electrode sheet tab morphology is the category that affects the dispersion performance, the regional fluorescence intensity of the preset excitation light in different tab distribution sub-areas with a second preset irradiation direction is obtained, and the hot pressing time of the bare battery cell as a whole is adjusted according to the change of the regional fluorescence intensity of each tab morphology abnormal sub-area.

9. The automated production method for new energy lithium-ion fast charging cells according to claim 8, characterized in that: The process of adjusting the pressurization pressure value includes: In response to the regional fluorescence intensity of the abnormal ear morphology sub-region being greater than the first fluorescence intensity reference value, adjusting the pressurization pressure value of the abnormal ear morphology sub-region according to the absolute value of the difference between the regional fluorescence intensity and the first fluorescence intensity reference value, wherein the pressurization pressure value is positively correlated with the absolute value of the difference; In response to the regional fluorescence intensity of the abnormal ear morphology sub-region being less than the second fluorescence intensity reference value, the pressurized pressure value of the abnormal ear morphology sub-region is adjusted according to the absolute value of the difference between the regional fluorescence intensity and the second fluorescence intensity reference value, and the pressurized pressure value is positively correlated with the absolute value of the difference.

10. The automated production method for new energy lithium-ion fast charging cells according to claim 8, characterized in that: The process of adjusting the hot pressing time of the entire bare cell includes: Calculate the average of the absolute values ​​of the differences between the fluorescence intensity of the region irradiated by the preset excitation light in the first preset irradiation direction and the fluorescence intensity of the region irradiated by the second preset irradiation direction for each sub-region with abnormal apico morphology; The hot pressing time for hot pressing the entire bare cell is adjusted according to the average value of the absolute value of the difference, and the hot pressing time is positively correlated with the average value of the absolute value of the difference.

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