Battery pole piece formula mass ratio determination method, equipment and storage medium

Abstract

The invention discloses a battery pole piece formula mass ratio determination method and device and a storage medium. The battery pole piece formula mass ratio determination method comprises the following steps: acquiring a section morphology image of a polished section of a battery pole piece of at least one formula mass ratio; determining areas of different morphologies according to the section morphology image of the polished section of the battery pole piece; according to the areas of the different morphologies in the section morphology image of the polished section of the battery pole piece, determining the area proportions of the different morphologies in the section morphology image of the polished section of the battery pole piece; and determining the test mass ratio of each component in the battery pole piece with at least one formula mass ratio according to the area ratio of different morphologies in the section morphology image of the polished section of the battery pole piece. The method can accurately determine the formula mass ratio of the battery pole piece, and is short in time consumption, high in accuracy and low in cost.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method, device and storage medium for determining the mass ratio of a battery electrode formula. Background Art

[0002] The battery electrode formula refers to the components of the battery electrode and the mass ratio of the components. The components of the battery electrode and the mass ratio of the components play an important role in the battery performance. Since the composition of the battery electrode is relatively complex, especially some trace additives are difficult to be quickly identified through simple methods.

[0003] At present, battery poles are usually subjected to destructive treatment to separate their internal substances, and then identified through inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscope (Scanning-Electron-Microscope, SEM) and energy dispersive spectrometer (EDS). However, the formula mass proportion of battery poles tested by these means is quite different from the actual formula mass proportion of battery poles, which has certain obstacles to the formula identification of battery poles. Summary of the invention

[0004] The present invention provides a method, device and storage medium for determining the mass ratio of a battery pole piece formula, so as to accurately determine the mass ratio of a battery pole piece formula.

[0005] According to one aspect of the present invention, an embodiment of the present invention provides a method for determining the mass ratio of a battery electrode formula, comprising:

[0006] Obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage;

[0007] Determine the area of ​​different morphologies based on the cross-sectional morphology image of the polished cross section of the battery electrode;

[0008] Determine the area ratio of different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece according to the areas of different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece;

[0009] According to the area proportions of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece, the test mass proportions of each component in the battery pole piece of at least one formula mass proportion are determined.

[0010] Optionally, determining the areas of different morphologies based on the cross-sectional morphology image of the polished cross-section of the battery electrode piece includes:

[0011] The areas of different morphologies in the cross-sectional morphology image of the polished cross-section of the battery pole piece are determined according to the areas of different grayscale images in the cross-sectional morphology image of the polished cross-section of the battery pole piece.

[0012] Optionally, after determining the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece, the method includes:

[0013] Determine the error of the test mass proportion of each component in the battery electrode according to the test mass proportion of each component in the battery electrode and the formula mass proportion of the battery electrode;

[0014] If the error of the test mass proportion of each component in the battery electrode is less than or equal to the first preset error, the test mass proportion of each component in the battery electrode conforms to the formula mass proportion of the battery electrode;

[0015] If the error of the test mass proportion of each component in the battery electrode is greater than the first preset error, the formula mass proportion of the battery electrode is readjusted and the error of the test mass proportion of each component in the battery electrode is determined again.

[0016] Optionally, if the error of the test mass ratio of each component in the battery electrode is less than or equal to the first preset error, then the test mass ratio of each component in the battery electrode meets the formula mass ratio of the battery electrode, and then includes:

[0017] Then retest the components in the battery pole piece with the same formula mass ratio, and determine the test mass ratio of each component in the battery pole piece again.

[0018] Optionally, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode sheet having at least one formula weight percentage includes:

[0019] Weigh the mass of each component in the battery electrode according to the mass proportion of each component in the battery electrode of at least one formula;

[0020] Prepare at least one battery electrode sheet with a formula mass ratio according to the masses of the components in the battery electrode sheet weighed;

[0021] The cross-section of the battery pole piece having at least one formula weight percentage is polished by an argon ion polisher.

[0022] Optionally, the components of the battery pole piece include a first component, a second component and a third component; the first component is an active main material, the second component is conductive carbon black, and the third component is polyvinylidene fluoride;

[0023] According to the areas of different grayscale images in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece, the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece is determined. The areas of different morphologies are determined by:

[0024] Determine the area of ​​a circular or elliptical shape in the cross-sectional topography image of the polished cross-sectional area of ​​the battery electrode piece according to the area of ​​the first grayscale image in the cross-sectional topography image of the polished cross-sectional area of ​​the battery electrode piece, wherein the area of ​​the circular or elliptical shape corresponds to the area of ​​the shape corresponding to the first component;

[0025] Determine the area of ​​the diffusely distributed morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece according to the area of ​​the second grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece, wherein the area of ​​the diffusely distributed morphology corresponds to the area of ​​the morphology corresponding to the second component;

[0026] Determine the area of ​​the continuously distributed morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece according to the area of ​​the third grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery pole piece, and the area of ​​the continuously distributed morphology corresponds to the area of ​​the morphology corresponding to the third component;

[0027] Among them, the second grayscale is greater than the first grayscale; the first grayscale is greater than the third grayscale.

[0028] Optionally, preparing at least one battery electrode sheet having a formula weight ratio according to the weight of each component in the battery electrode sheet weighed includes:

[0029] According to the weight of each component in the battery electrode sheet, a battery electrode sheet having a first formula weight ratio is prepared;

[0030] According to the weight of each component in the battery electrode sheet, a battery electrode sheet having a second formula weight ratio is prepared;

[0031] According to the weight of each component in the battery electrode, a battery electrode having a third formula weight ratio is prepared;

[0032] The internal resistance of the battery pole piece with the first formula mass percentage is less than the internal resistance of the battery pole piece with the second formula mass percentage, and the internal resistance of the battery pole piece with the first formula mass percentage is less than the internal resistance of the battery pole piece with the third formula mass percentage;

[0033] The capacity of the battery pole piece with the second formula mass ratio is greater than the capacity of the battery pole piece with the first formula mass ratio, and the capacity of the battery pole piece with the second formula mass ratio is greater than the capacity of the battery pole piece with the third formula mass ratio;

[0034] After a preset number of cyclic charge and discharge tests, the ratio of the remaining capacity to the initial capacity of the battery electrode with the third formula mass percentage is greater than the ratio of the remaining capacity to the initial capacity of the battery electrode with the first formula mass percentage, and the ratio of the remaining capacity to the initial capacity of the battery electrode with the third formula mass percentage is greater than the ratio of the remaining capacity to the initial capacity of the battery electrode with the second formula mass percentage.

[0035] Optionally, the first preset error is greater than or equal to 5%.

[0036] According to another aspect of the present invention, an embodiment of the present invention provides an electronic device, including:

[0037] at least one processor; and

[0038] a memory communicatively connected to at least one processor; wherein,

[0039] The memory stores a computer program that can be executed by at least one processor, and the computer program is executed by at least one processor so that the at least one processor can execute the method for determining the mass ratio of the battery electrode formula provided in any embodiment of the present invention.

[0040] According to another aspect of the present invention, an embodiment of the present invention provides a computer-readable storage medium, including: the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the mass ratio of a battery electrode formula provided by any embodiment of the present invention when executed.

[0041] In an embodiment of the present invention, a cross-sectional morphology image of a polished cross section of a battery pole piece of at least one formula mass ratio is obtained, and the areas of different morphologies are determined according to the cross-sectional morphology image of the polished cross section of the battery pole piece, and the area ratios of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece are determined according to the areas of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece. The test mass ratio of each component in the battery pole piece of each formula mass ratio is determined according to each formula mass ratio, the area ratio corresponding to each formula mass ratio and the area of ​​different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece. The present invention can accurately determine the test mass ratio of each component in the battery pole piece, and match the performance of battery pole pieces with different formula ratios one by one through the formula ratio of the battery pole piece. Moreover, this method is time-saving, highly accurate and low-cost, and plays an important role in the study of battery performance.

[0042] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 It is a flow chart of a method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0045] Figure 2 This is a cross-sectional morphology diagram of a battery electrode having a formula weight ratio of 92:5:3 provided in an embodiment of the present invention;

[0046] Figure 3 This is a cross-sectional morphology diagram of a battery electrode having a formula weight ratio of 95:3:2 provided in an embodiment of the present invention;

[0047] Figure 4 This is a cross-sectional morphology diagram of a battery electrode having a formula weight ratio of 90:5:5 provided in an embodiment of the present invention;

[0048] Figure 5 It is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0049] Figure 6 It is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0050] Figure 7 It is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0051] Figure 8 It is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0052] Fig. 9 It is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0053] Fig.10 It is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention;

[0054] Fig.11 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 only 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 ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, any variation of the terms "including" and "having" is intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] Figure 1 is a flow chart of a method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention; see Figure 1 The method for determining the mass ratio of the battery electrode formula includes:

[0058] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0059] Among them, the formula mass ratio represents the composition of the battery pole piece and the mass ratio of the component. The components of the battery pole piece include active main material, conductive carbon black and polyvinylidene fluoride. The polished cross-sectional morphology image of the battery pole piece is obtained by electron scanning microscopy.

[0060] Figure 2 This is a cross-sectional morphology diagram of a battery electrode having a formula weight ratio of 92:5:3 provided in an embodiment of the present invention; Figure 3 This is a cross-sectional morphology diagram of a battery electrode having a formula weight ratio of 95:3:2 provided in an embodiment of the present invention; Figure 4 is a cross-sectional morphology diagram of a battery electrode having a formula weight ratio of 90:5:5 provided in an embodiment of the present invention, see Figure 2-Figure 4The formula mass ratio of the battery pole piece is 92:5:3, which means that the ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole piece is 92:5:3. The formula mass ratio of the battery pole piece is 95:3:2, which means that the ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole piece is 95:3:2. The formula mass ratio of the battery pole piece is 90:5:5, which means that the ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole piece is 90:5:5.

[0061] Taking a battery electrode in which the mass ratio of active main material, conductive carbon black and polyvinylidene fluoride is 92:5:3 as an example, the cross-sectional morphologies of the polished cross section of the battery electrode include a circular or elliptical morphology 20, a diffusely distributed morphology 21 and a continuously distributed morphology 22. The cross-sectional morphology images of the polished cross section of the battery electrode with each formula mass ratio are obtained by scanning electron microscopy.

[0062] S120, determining areas of different morphologies according to a cross-sectional morphology image of a polished cross section of the battery electrode.

[0063] Specifically, the areas of the circular or elliptical morphology 20, the diffusely distributed morphology 21 and the continuously distributed morphology 22 in the polished section are respectively determined by the circular or elliptical morphology 20, the diffusely distributed morphology 21 and the continuously distributed morphology 22 of the polished section of the battery electrode.

[0064] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0065] Among them, the area of ​​the circular or elliptical morphology 20 corresponds to the area of ​​the active main material in the battery pole piece; the area of ​​the diffusely distributed morphology 21 corresponds to the area of ​​the conductive carbon black in the battery pole piece; the area of ​​the continuously distributed morphology 22 corresponds to the area of ​​the polyvinylidene fluoride in the battery pole piece, that is, the areas of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole piece are determined according to the areas of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0066] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0067] Specifically, Table 1 is a data table of the mass proportion and area proportion of each component in the battery electrode, as shown in Table 1,

[0068] Table 1 is a table showing the mass and area percentage of each component in the battery electrode

[0069]

[0070] Wherein, SP represents conductive carbon black, PVDF represents polyvinylidene fluoride, and the mass proportion and area proportion of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole piece in Table 1 are calculated by the method described in the embodiment of the present invention, and the mass proportion and area proportion of the active main material, conductive carbon black and polyvinylidene fluoride are determined by obtaining the average value after at least two calculations;

[0071] Specifically, the test mass proportions of the active main materials, conductive carbon black and polyvinylidene fluoride in the battery pole piece are determined according to the mass proportions and corresponding area proportions of the active main materials, conductive carbon black and polyvinylidene fluoride in the battery pole piece provided in Table 1 and the area proportions of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0072] Exemplarily, the mass ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole piece is 92:5:3 as the reference group, according to the mass ratio of the active main material, conductive carbon black and polyvinylidene fluoride provided in Table 1, the mass ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the corresponding battery pole piece is 92:5:3, the area ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the corresponding battery pole piece is 77.5:21.1:1.4, and it is assumed that the area ratio of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece determined in step S130 of the embodiment of the present invention is 85.6:13.4:1.0 to determine the test mass ratio of each component in the battery pole piece, and the test mass ratio of each component in the battery pole piece is:

[0073] (92:5:3) / (x1:y1:z1)=(77.5:21.1:1.4) / (85.6:13.4:1.0)

[0074] The result of x1:y1:z1 is 95:3:2.

[0075] In an embodiment of the present invention, a cross-sectional morphology image of a polished cross section of a battery pole piece of at least one formula mass proportion is obtained, the areas of different morphologies are determined according to the cross-sectional morphology image of the polished cross section of the battery pole piece, and the area proportions of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece are determined according to the areas of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece. The test mass proportion of each component in the battery pole piece of each formula mass proportion is determined according to each formula mass proportion, the area proportion corresponding to each formula mass proportion and the area of ​​different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece. The present invention can accurately determine the test mass proportion of each component in the battery pole piece, and is time-saving, accurate and cost-effective, and plays an important role in the study of battery performance.

[0076] Figure 5 is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention, and Figure 1The difference between the method for determining the mass ratio of the battery pole piece formula shown is that the area of ​​the cross-sectional morphology image of the polished cross-sectional surface of the battery pole piece is determined according to the area of ​​the different grayscale images in the cross-sectional morphology image of the polished cross-sectional surface of the battery pole piece, such as Figure 5 As shown, the specific steps of the method for determining the mass ratio of the battery electrode formula are as follows:

[0077] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0078] S1201. Determine the areas of different morphologies in the cross-sectional morphology image of the polished cross-sectional surface of the battery electrode piece according to the areas of different grayscale images in the cross-sectional morphology image of the polished cross-sectional surface of the battery electrode piece.

[0079] Among them, in the cross-sectional morphology image of the polished cross section of the battery electrode, the grayscale of the conductive carbon black is greater than the grayscale of the active main material, and the grayscale of the active main material is greater than the grayscale of polyvinylidene fluoride.

[0080] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0081] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0082] In an embodiment of the present invention, the areas of different morphologies in the cross-sectional morphology image of the polished cross-section of the battery pole piece are determined by the areas of different grayscale images in the cross-sectional morphology image of the polished cross-section of the battery pole piece, thereby improving the accuracy of the area of ​​each component in the battery pole piece.

[0083] Figure 6 is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention, and Figure 1 The difference between the method for determining the mass proportion of the battery pole sheet formula shown is that the error of the test mass proportion of each component in the battery pole sheet is determined according to the test mass proportion of each component in the battery pole sheet and the mass proportion of each component in the battery pole sheet, see Figure 6 The specific steps of the method for determining the mass ratio of the battery electrode formula are as follows:

[0084] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0085] S120, determining areas of different morphologies according to a cross-sectional morphology image of a polished cross section of the battery electrode.

[0086] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0087] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0088] S150. Determine the error of the test mass proportion of each component in the battery electrode according to the test mass proportion of each component in the battery electrode and the formula mass proportion of the battery electrode.

[0089] Specifically, the error of the test mass proportion of each component in the battery electrode is determined by the formula mass proportion of the battery electrode provided in Table 1 and the test mass proportion of each component in the battery electrode corresponding to the formula mass proportion of the battery electrode calculated in the above embodiment.

[0090] Exemplarily, taking the battery electrode formula mass ratio of 92:5:3 in Table 1 as an example, a battery electrode is prepared according to the battery electrode formula mass ratio of 92:5:3 shown in Table 1, and the test mass ratio of each component in the battery electrode is determined through steps S110, S120, S130 and S140. According to the test mass ratio of each component in the battery electrode and the formula mass ratio of the battery electrode, the error of the test mass ratio of each component in the battery electrode is determined.

[0091] S160. If the error of the test mass proportion of each component in the battery electrode is less than or equal to the first preset difference, the test mass proportion of each component in the battery electrode is consistent with the formula mass proportion of the battery electrode.

[0092] S170. If the error of the test mass proportion of each component in the battery electrode is greater than the first preset error, readjust the formula mass proportion of the battery electrode and determine the error of the test mass proportion of each component in the battery electrode again.

[0093] Specifically, if the error of the test mass proportion of each component in the battery electrode is greater than the first preset error, the formula mass proportion of the battery electrode is adjusted by the control variable method to determine the error of the test mass proportion of each component in the battery electrode again.

[0094] In an embodiment of the present invention, the formula mass ratio of the battery electrode is adjusted by the control variable method to obtain the battery electrode with the best performance, thereby improving the battery performance. It also plays a vital role in optimizing the performance of the battery electrode and analyzing and studying the battery electrode with unknown test mass ratios of each component.

[0095] Optionally, based on the above embodiment, the first preset error is greater than or equal to 5%.

[0096] Specifically, when the error of the test mass proportion of each component in the battery electrode is less than or equal to 5%, the test mass proportion of each component in the battery electrode conforms to the formula mass proportion of the battery electrode in Table 1.

[0097] Figure 7 is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention, and Figure 1 The difference between the method for determining the mass proportion of the battery pole sheet formula shown is that the error of the test mass proportion of each component in the battery pole sheet is determined according to the test mass proportion of each component in the battery pole sheet and the mass proportion of each component in the battery pole sheet, see Figure 7 The specific steps of the method for determining the mass ratio of the battery electrode formula are as follows:

[0098] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0099] S120, determining areas of different morphologies according to a cross-sectional morphology image of a polished cross section of the battery electrode.

[0100] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0101] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0102] S150. Determine the error of the test mass proportion of each component in the battery electrode according to the test mass proportion of each component in the battery electrode and the mass proportion of each component in the battery electrode.

[0103] S160. If the error of the test mass proportion of each component in the battery electrode is less than or equal to the first preset difference, the test mass proportion of each component in the battery electrode is consistent with the formula mass proportion of the battery electrode.

[0104] S161. Retest the components in the battery electrode with the same formula mass ratio, and determine the test mass ratio of each component in the battery electrode again.

[0105] S170. If the error of the test mass proportion of each component in the battery electrode is greater than the first preset error, readjust the formula mass proportion of the battery electrode and determine the error of the test mass proportion of each component in the battery electrode again.

[0106] In an embodiment of the present invention, if the test mass proportion of each component in the battery electrode is consistent with the formula mass proportion of the battery electrode, the components in the battery electrode with the same mass proportion are retested to determine the test mass proportion of each component in the battery electrode again to verify the repeatability and reproducibility of the battery electrode performance and improve the reliability of the battery electrode.

[0107] Figure 8 is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention, and Figure 1 The difference between the method for determining the mass ratio of the battery pole sheet formula shown is that at least one battery pole sheet with a mass ratio of the formula is prepared according to the mass of each component in the battery pole sheet weighed, see Figure 8 The specific steps of the method for determining the mass ratio of the battery electrode formula are as follows:

[0108] S80. Weigh the mass of each component in the battery electrode according to the mass proportion of each component in the battery electrode of at least one formula.

[0109] Specifically, an electronic scale is used to weigh the mass of each component in the battery electrode according to the mass ratio of each component in the battery electrode of 92:5:3, 95:3:2 and 90:5:5.

[0110] S90. Prepare a battery electrode having at least one formula mass ratio according to the masses of the components in the weighed battery electrode.

[0111] S100, polishing the cross-section of the battery pole piece having at least one formula weight percentage by using an argon ion polisher.

[0112] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0113] S120, determining areas of different morphologies according to a cross-sectional morphology image of a polished cross section of the battery electrode.

[0114] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0115] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0116] In an embodiment of the present invention, the mass of each component in the battery pole piece is weighed according to the formula mass ratio of the battery pole piece, thereby achieving accurate weighing of the mass of each component of the battery pole piece, and the cross-section of a battery pole piece of at least one formula mass ratio is polished by an argon ion polisher, so that the cross-section of the battery pole piece is flat and free of cracks, thereby improving the accuracy of the tested mass ratio of each component in the battery pole piece.

[0117] Fig. 9 is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention, see Fig. 9 ,and Figure 5 The difference of the method for determining the mass ratio of the battery electrode formula shown is that the area of ​​the circular or elliptical morphology in the battery electrode is determined according to the area of ​​the first grayscale image, the area of ​​the diffusely distributed morphology in the battery electrode is determined according to the area of ​​the second grayscale image, and the area of ​​the continuously distributed morphology in the battery electrode is determined according to the area of ​​the third grayscale image. The specific steps of the method for determining the mass ratio of the battery electrode formula are as follows:

[0118] The components of the battery pole piece include a first component, a second component and a third component; the first component is an active main material, the second component is conductive carbon black, and the third component is polyvinylidene fluoride;

[0119] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0120] S12010. Determine the area of ​​a circular or elliptical morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode based on the area of ​​the first grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode, wherein the area of ​​the circular or elliptical morphology corresponds to the area of ​​the morphology corresponding to the first component.

[0121] S12011. Determine the area of ​​the diffusely distributed morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode based on the area of ​​the second grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode, wherein the area of ​​the diffusely distributed morphology corresponds to the area of ​​the morphology corresponding to the second component.

[0122] S12012. Determine the area of ​​the continuously distributed morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode based on the area of ​​the third grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode, the area of ​​the continuously distributed morphology corresponds to the area of ​​the morphology corresponding to the third component, the second grayscale is greater than the first grayscale; the first grayscale is greater than the third grayscale.

[0123] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0124] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0125] In an embodiment of the invention, the area of ​​the first component is determined by the area of ​​the first grayscale image in the cross-sectional morphology image of the polished cross-section of the battery pole piece, the area of ​​the second component is determined by the area of ​​the second grayscale image in the cross-sectional morphology image of the polished cross-section of the battery pole piece, and the area of ​​the third component is determined by the area of ​​the third grayscale image in the cross-sectional morphology image of the polished cross-section of the battery pole piece. In this way, the area of ​​each component in the battery pole piece can be quickly identified, which shortens the time and improves the accuracy.

[0126] Fig.10 is a flow chart of another method for determining the mass ratio of a battery electrode formula provided by an embodiment of the present invention, see Fig.10 ,and Figure 8 The difference of the method for determining the mass ratio of the battery pole sheet formula shown is that the battery pole sheets with the first formula mass ratio, the second formula mass ratio and the third formula mass ratio are prepared respectively according to the mass of each component in the battery pole sheet weighed. The specific steps of the method for determining the mass ratio of the battery pole sheet formula are as follows:

[0127] S80. Weigh the mass of each component in the battery electrode according to the mass proportion of each component in the battery electrode of at least one formula.

[0128] S901. Prepare a battery electrode having a first formula mass ratio according to the masses of the components in the battery electrode weighed.

[0129] Among them, the mass ratio of the first formula is 92:5:3, that is, the mass ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole is 92:5:3. The battery pole with the first formula has the best internal resistance performance.

[0130] S902. Prepare a battery electrode sheet having a second formula mass ratio according to the masses of the components in the weighed battery electrode sheet.

[0131] Among them, the mass ratio of the second formula is 95:3:2, that is, the mass ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole is 95:3:2. The battery pole with the second formula has the best capacity performance.

[0132] S903, preparing a battery electrode having a third formula mass ratio according to the masses of the components in the weighed battery electrode.

[0133] Among them, the mass ratio of the third formula is 90:5:5, that is, the mass ratio of the active main material, conductive carbon black and polyvinylidene fluoride in the battery pole is 90:5:5. The battery pole with the third formula has the best cycle performance.

[0134] S100, polishing the cross-section of the battery pole piece having at least one formula weight percentage by using an argon ion polisher.

[0135] S100, polishing the cross-section of the battery pole piece having at least one formula weight percentage by using an argon ion polisher.

[0136] S110, obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage.

[0137] S120, determining areas of different morphologies according to a cross-sectional morphology image of a polished cross section of the battery electrode.

[0138] S130, determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece.

[0139] S140. Determine the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece.

[0140] The internal resistance of the battery pole piece with the first formula mass percentage is less than the internal resistance of the battery pole piece with the second formula mass percentage, and the internal resistance of the battery pole piece with the first formula mass percentage is less than the internal resistance of the battery pole piece with the third formula mass percentage;

[0141] The capacity of the battery pole piece with the second formula mass ratio is greater than the capacity of the battery pole piece with the first formula mass ratio, and the capacity of the battery pole piece with the second formula mass ratio is greater than the capacity of the battery pole piece with the third formula mass ratio;

[0142] After a preset number of cyclic charge and discharge tests, the ratio of the remaining capacity to the initial capacity of the battery electrode with the third formula mass percentage is greater than the ratio of the remaining capacity to the initial capacity of the battery electrode with the first formula mass percentage, and the ratio of the remaining capacity to the initial capacity of the battery electrode with the third formula mass percentage is greater than the ratio of the remaining capacity to the initial capacity of the battery electrode with the second formula mass percentage.

[0143] Among them, capacity refers to the amount of charge that a battery electrode can store and release during an electrochemical reaction. After a preset number of cyclic charge and discharge tests, the ratio of the remaining capacity of the battery electrode with the third formula mass percentage to the initial capacity is greater than or equal to 96% and less than or equal to 98%.

[0144] In an embodiment of the present invention, the performance of the battery electrodes is matched one by one by the proportion of their formula mass, and the formula ratio parameters are adjusted by the control variable method to obtain the electrode with the best electrical performance, thereby improving the performance of the battery electrode, and also playing a vital role in the optimization of the performance of the battery electrode and the analysis and research of the electrode with unknown formula ratio.

[0145] Fig.11 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention, see Fig.11 The electronic device comprises: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the mass ratio of the battery electrode formula provided in any embodiment of the present invention.

[0146] Electronic devices are intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or claimed herein.

[0147] like Fig.11 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, ROM 12 and RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0148] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0149] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the method for determining the mass ratio of the battery electrode formula provided in any embodiment of the present invention.

[0150] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0151] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0152] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0153] An embodiment of the present invention further provides a computer-readable storage medium storing computer instructions, which are used to enable a processor to implement the method for determining the mass ratio of a battery electrode formula provided by any embodiment of the present invention when executing the computer instructions.

[0154] For details, see Fig.11 The method for determining the mass ratio of a battery electrode formula may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18 .

[0155] In an embodiment of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0156] Part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining the mass ratio of the battery electrode formula provided in any embodiment of the present invention may be executed. Alternatively, in other embodiments, the processor 11 may be configured to execute the method in any other appropriate manner (e.g., by means of firmware).

[0157] Various implementations of the systems and techniques described in any embodiment of the present invention can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations may include: being implemented in one or more computer programs, which can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a dedicated or general programmable processor, which can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0158] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0159] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0160] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining the mass ratio of a battery electrode formula, characterized in that: include: Obtaining a cross-sectional morphology image of a polished cross section of a battery electrode having at least one formula mass percentage; Determining the areas of different morphologies according to the cross-sectional morphology image of the polished cross section of the battery electrode sheet; Determining the area ratios of the different morphologies in the cross-sectional morphology image of the polished cross-sectional surface of the battery electrode piece according to the areas of the different morphologies in the cross-sectional morphology image of the polished cross-sectional surface of the battery electrode piece; According to the area proportions of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece, the test mass proportions of each component in the battery pole piece of at least one formula mass proportion are determined.

2. The method for determining the mass ratio of battery electrode formula according to claim 1, characterized in that: Determining the areas of different morphologies according to the cross-sectional morphology image of the polished cross section of the battery pole piece includes: The areas of different morphologies in the cross-sectional morphology image of the polished cross-section of the battery pole piece are determined according to the areas of different grayscale images in the cross-sectional morphology image of the polished cross-section of the battery pole piece.

3. The method for determining the mass ratio of battery electrode formula according to claim 1 or 2, characterized in that: Determining the test mass proportion of each component in the battery pole piece of at least one formula mass proportion according to the area proportion of different morphologies in the cross-sectional morphology image of the polished cross section of the battery pole piece comprises: Determining the error of the test mass proportion of each component in the battery electrode sheet according to the test mass proportion of each component in the battery electrode sheet and the formula mass proportion of the battery electrode sheet; If the error of the test mass proportion of each component in the battery electrode is less than or equal to the first preset error, then the test mass proportion of each component in the battery electrode conforms to the formula mass proportion of the battery electrode; If the error of the test mass proportion of each component in the battery electrode is greater than the first preset error, the formula mass proportion of the battery electrode is readjusted and the error of the test mass proportion of each component in the battery electrode is determined again.

4. The method for determining the mass ratio of battery electrode formula according to claim 3, characterized in that: If the error of the test mass proportion of each component in the battery electrode is less than or equal to the first preset error, then the test mass proportion of each component in the battery electrode conforms to the formula mass proportion of the battery electrode, and then includes: Then retest the components in the battery pole piece with the same formula mass ratio, and determine the test mass ratio of each component in the battery pole piece again.

5. The method for determining the mass ratio of battery electrode formula according to claim 1 or 2, characterized in that: The method of obtaining a cross-sectional morphology image of a polished cross section of a battery electrode sheet having at least one formula weight percentage includes: Weigh the mass of each component in the battery electrode sheet according to the mass proportion of each component in the battery electrode sheet of at least one formula mass proportion; Prepare at least one battery electrode sheet with a formula mass ratio according to the weighed masses of the components in the battery electrode sheet; The cross-section of the battery pole piece having at least one formula weight percentage is polished by an argon ion polisher.

6. The method for determining the mass ratio of battery electrode formula according to claim 1 or 2, characterized in that: The components of the battery pole piece include a first component, a second component and a third component; the first component is an active main material, the second component is conductive carbon black, and the third component is polyvinylidene fluoride; Determining the areas of different grayscale images in the cross-sectional topography image of the polished cross-sectional surface of the battery pole piece includes: Determining the area of ​​a circular or elliptical shape in the cross-sectional topography image of the polished cross-sectional area of ​​the battery electrode piece according to the area of ​​the first grayscale image in the cross-sectional topography image of the polished cross-sectional area of ​​the battery electrode piece, wherein the area of ​​the circular or elliptical shape corresponds to the area of ​​the shape corresponding to the first component; Determine the area of ​​the diffusely distributed morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the area of ​​the second grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece, wherein the area of ​​the diffusely distributed morphology corresponds to the area of ​​the morphology corresponding to the second component; Determine the area of ​​a continuously distributed morphology in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece according to the area of ​​the third grayscale image in the cross-sectional morphology image of the polished cross-sectional area of ​​the battery electrode piece, wherein the area of ​​the continuously distributed morphology corresponds to the area of ​​the morphology corresponding to the third component; Among them, the second grayscale is greater than the first grayscale; the first grayscale is greater than the third grayscale.

7. The method for determining the mass ratio of battery electrode formula according to claim 5, characterized in that: Preparing at least one battery pole sheet with a formula weight ratio according to the weight of each component in the battery pole sheet comprises: Preparing a battery electrode sheet having a first formula mass ratio according to the weighed masses of the components in the battery electrode sheet; Preparing a battery electrode sheet with a second formula mass ratio according to the weighed masses of the components in the battery electrode sheet; Preparing a battery electrode sheet with a third formula mass ratio according to the weighed masses of the components in the battery electrode sheet; The internal resistance of the battery pole piece with the first formula mass percentage is less than the internal resistance of the battery pole piece with the second formula mass percentage, and the internal resistance of the battery pole piece with the first formula mass percentage is less than the internal resistance of the battery pole piece with the third formula mass percentage; The capacity of the battery pole piece with the second formula mass ratio is greater than the capacity of the battery pole piece with the first formula mass ratio, and the capacity of the battery pole piece with the second formula mass ratio is greater than the capacity of the battery pole piece with the third formula mass ratio; After a preset number of cyclic charge and discharge tests, the ratio of the remaining capacity to the initial capacity of the battery electrode with the third formula mass percentage is greater than the ratio of the remaining capacity to the initial capacity of the battery electrode with the first formula mass percentage, and the ratio of the remaining capacity to the initial capacity of the battery electrode with the third formula mass percentage is greater than the ratio of the remaining capacity to the initial capacity of the battery electrode with the second formula mass percentage.

8. The method for determining the mass ratio of battery electrode formula according to claim 3, characterized in that: The first preset error is greater than or equal to 5%.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the mass ratio of the battery electrode formula according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the mass ratio of a battery electrode formula according to any one of claims 1 to 8 when executed.

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