Fault diagnosis methods, apparatus and electronic equipment for pre-metallized electrodes

Abstract

This invention discloses a method, apparatus, and electronic device for determining faults in pre-metallized electrodes. The method includes: acquiring a target pre-metallized electrode; determining a preset pre-metallized element amount in the target pre-metallized electrode; measuring a target electrical parameter value between the target pre-metallized electrode and a reference electrode; determining the target pre-metallized element amount corresponding to the target electrical parameter value based on a target reference relationship, wherein the target reference relationship is a comparison between the electrical parameter value and the pre-metallized element amount; and determining whether the target pre-metallized electrode exhibits a fault due to an abnormal pre-metallized element amount based on the target pre-metallized element amount and the preset pre-metallized element amount. This invention solves the technical problem in related technologies where the determination of faults in pre-metallized electrodes involves complex measurement steps and is difficult.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically, to a method, apparatus, and electronic device for determining faults in pre-metallized electrode sheets. Background Technology

[0002] Metal-ion batteries can be of various types, such as lithium-ion batteries and sodium-ion batteries. Taking lithium-ion batteries as an example, they have been widely used in digital 3C products, electric vehicle power batteries, and energy storage due to their advantages such as high voltage, high energy density, long cycle life, and no pollution. With the increasing research and use of lithium-ion batteries as a power source for power systems, there are higher requirements for battery lightweighting and driving range. Therefore, improving the energy density of lithium-ion batteries has become the key to solving this problem.

[0003] Improving the specific capacity of the positive and negative electrode materials in lithium-ion batteries is a conventional and effective method to increase the energy density of lithium-ion batteries. Currently, the theoretical specific capacity of commonly used graphite anode materials is 372 mAh / g, while that of silicon-carbon anodes is 3580 mAh / g. Therefore, using silicon-carbon composite materials as anodes in lithium-ion batteries can significantly increase the capacity of a single cell. Because silicon-carbon anodes have a relatively low initial efficiency, in order to improve the initial efficiency of the cell and better utilize the capacity of the positive electrode material, a lithium replenishment process is needed to compensate for the irreversible capacity loss.

[0004] During the pre-lithiation process, the accuracy of the lithium content after lithium intercalation on the electrode is crucial to the actual electrochemical performance of the battery. Existing pre-lithiation devices struggle to accurately detect the lithium content after lithium intercalation on the electrode online. Therefore, when inaccurate lithium content occurs after lithium intercalation on the electrode, the pre-lithiation process cannot be adjusted in a timely manner.

[0005] Therefore, in order to solve the above problems, there is an urgent need for an online, rapid, and non-destructive method for monitoring the pre-metal element content of electrodes. Summary of the Invention

[0006] This invention provides a method, apparatus, and electronic device for determining faults in pre-metallized electrodes, thereby at least solving the technical problems of complex and difficult determination steps in related technologies when determining faults in pre-metallized electrodes.

[0007] According to one aspect of the present invention, a method for determining faults in a pre-metallized electrode is provided, comprising: acquiring a target pre-metallized electrode; determining a preset pre-metallized element amount of the target pre-metallized electrode; measuring a target electrical parameter value between the target pre-metallized electrode and a reference electrode, wherein both the target pre-metallized electrode and the reference electrode are immersed in an electrolyte bath, and the target pre-metallized electrode and the reference electrode are placed parallel to each other at a predetermined interval; determining a target pre-metallized element amount corresponding to the target electrical parameter value based on a target comparison relationship, wherein the target comparison relationship is a comparison relationship between the electrical parameter value and the pre-metallized element amount; and determining a fault result indicating whether the target pre-metallized electrode exhibits an abnormal pre-metallized element amount fault based on the target pre-metallized element amount and the preset pre-metallized element amount.

[0008] Optionally, determining whether the target pre-metallized electrode exhibits an abnormal pre-metallization fault based on the target pre-metallization element amount and the preset pre-metallization element amount includes: determining a preset pre-metallization element range corresponding to the preset pre-metallization element amount; and determining that the fault result is that the target pre-metallized electrode exhibits an abnormal pre-metallization fault when the target pre-metallization element amount does not belong to the preset pre-metallization element range.

[0009] Optionally, determining whether the target pre-metallized electrode has an abnormal pre-metall content fault based on the target pre-metall content and the preset pre-metall content includes: when the target pre-metall content is one of multiple target pre-metall content determined within a predetermined time period, determining the fault result based on the multiple target pre-metall content within the predetermined time period and the preset pre-metall content.

[0010] Optionally, determining the target electrical parameter value between the target pre-metallized electrode and the reference electrode includes: when the length of the target pre-metallized electrode is greater than the length of the reference electrode and there are multiple target electrical parameter values, aligning the first side of the target pre-metallized electrode with the first side of the reference electrode; vertically moving the target pre-metallized electrode at a predetermined speed until the second side of the target pre-metallized electrode is aligned with the second side of the reference electrode, and determining multiple target electrical parameter values ​​between the target pre-metallized electrode and the reference electrode during the movement.

[0011] Optionally, determining the target electrical parameter value between the target pre-metallized electrode and the reference electrode includes: when the width of the target pre-metallized electrode is greater than the width of the reference electrode and there are multiple target electrical parameter values, aligning the third side of the target pre-metallized electrode with the third side of the reference electrode; moving the target pre-metallized electrode laterally at a predetermined speed until the fourth side of the target pre-metallized electrode is aligned with the fourth side of the reference electrode, and determining multiple target electrical parameter values ​​between the target pre-metallized electrode and the reference electrode during the movement.

[0012] Optionally, after measuring multiple target electrical parameter values ​​between the target pre-metallized electrode and the reference electrode during the movement, the method further includes: determining the difference between each pair of target electrical parameter values ​​to obtain a set of differences; and determining that the target pre-metallized electrode has a pre-metallization element unevenness fault if there is a difference greater than a predetermined difference in the set of differences.

[0013] Optionally, before determining the target pre-metallized element amount corresponding to the target electrical parameter value based on the target control relationship, the method further includes: determining multiple sample pre-metallized electrodes and the reference electrode, wherein the multiple sample pre-metallized electrodes correspond to different sample pre-metallized element amounts; determining multiple sample electrical parameter values ​​between the multiple sample pre-metallized electrodes and the reference electrode, wherein the multiple sample pre-metallized electrodes and the reference electrode are sequentially immersed in an electrolyte bath, and the corresponding sample pre-metallized electrodes and the reference electrode are placed parallel to each other at a predetermined interval; determining the target control relationship based on the different sample pre-metallized element amounts corresponding to the multiple sample pre-metallized electrodes and the multiple sample electrical parameter values.

[0014] According to one aspect of the present invention, a fault determination device for a pre-metallized electrode is provided, comprising: an acquisition module for acquiring a target pre-metallized electrode; a first determination module for determining a preset pre-metallized element amount of the target pre-metallized electrode; a measurement module for measuring a target electrical parameter value between the target pre-metallized electrode and a reference electrode, wherein both the target pre-metallized electrode and the reference electrode are immersed in an electrolyte bath, and the target pre-metallized electrode and the reference electrode are placed parallel to each other at a predetermined interval; a second determination module for determining a target pre-metallized element amount corresponding to the target electrical parameter value based on a target comparison relationship, wherein the target comparison relationship is a comparison relationship between the electrical parameter value and the pre-metallized element amount; and a third determination module for determining whether the target pre-metallized electrode has a fault result indicating an abnormal pre-metallized element amount fault based on the target pre-metallized element amount and the preset pre-metallized element amount.

[0015] According to one aspect of the present invention, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the fault determination method for pre-metallized electrode as described in any of the preceding claims.

[0016] According to one aspect of the present invention, a computer-readable storage medium is provided, wherein when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to perform the fault determination method for pre-metallized electrode as described in any of the preceding claims.

[0017] In this embodiment of the invention, a target pre-metallized electrode is obtained, and the target electrical parameter value between the target pre-metallized electrode and the reference electrode is measured. Based on the target comparison relationship, the target pre-metallized element quantity corresponding to the target electrical parameter value is determined, i.e., the actual pre-metallized element quantity of this pre-metallized electrode can be determined. Based on the actual target pre-metallized element quantity and the preset pre-metallized element quantity corresponding to the target pre-metallized electrode, it is determined whether the target pre-metallized electrode exhibits a fault result indicating an abnormal pre-metallized element quantity. As can be seen from the above steps, this embodiment of the invention determines the target pre-metallized element quantity by using the target electrical parameter value between the target pre-metallized electrode and the reference electrode. Therefore, the target pre-metallized element quantity can be determined through a simple comparison relationship. Moreover, since both the target pre-metallized electrode and the reference electrode are immersed in an electrolyte bath and placed parallel to each other at a predetermined interval, the target electrical parameter value between them can be accurately determined, thus ensuring the accuracy of the determined pre-metallized element quantity. Finally, by directly comparing the target pre-metal element amount with the preset pre-metal element amount, it is determined whether the target pre-metallized electrode has an abnormal pre-metal element amount fault, thus achieving the purpose of fault determination. This solves the technical problem of complex measurement steps and difficult measurement when measuring pre-metallized electrode faults in related technologies. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a flowchart of a method for determining the faults of a pre-metallized electrode according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a pre-metal element quantity determination system provided for an optional embodiment of the present invention;

[0021] Figure 3 A schematic diagram showing the relationship between voltage and the amount of pre-metallic elements is provided for an optional embodiment of the present invention;

[0022] Figure 4 This is a structural block diagram of a fault determination device for pre-metallized electrode sheets according to an embodiment of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] Example 1

[0026] According to an embodiment of the present invention, an embodiment of a fault determination method for pre-metallized electrode is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0027] Figure 1 This is a flowchart of a fault determination method for pre-metallized electrode sheets according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0028] Step S102: Obtain the target pre-metallized electrode sheet;

[0029] In step S102 of this application, the target pre-metallized electrode is an electrode that has already undergone pre-metallization. There are various types of pre-metallization, such as pre-lithiation electrodes and pre-sodiumization electrodes. Pre-metallization refers to the process of introducing a substance with a high metal element content into the battery material system (mainly on the positive / negative electrode side) and enabling this substance to effectively release metal ions and electrons. After pre-metallization, the pre-metallized electrode will contain a certain amount of pre-metal elements. The amount of pre-metal elements in the pre-metallized electrode can be set differently according to the actual application and scenario to ensure that the pre-metallized electrode performs the corresponding function during use.

[0030] Step S104: Determine the preset amount of pre-metallized elements for the target pre-metallized electrode.

[0031] In step S104 of this application, the preset amount of pre-metallized elements of the target pre-metallized electrode is determined. That is, the amount of pre-metallized elements that the target pre-metallized electrode should contain during the pre-metallization operation is determined. This is so that the actual amount of pre-metallized elements of the target pre-metallized electrode can be detected to see if it is the same as the preset amount of pre-metallized elements or within a certain error range, thereby determining whether there is a fault.

[0032] Step S106: Measure the target electrical parameter value between the target pre-metallized electrode and the reference electrode, wherein the target pre-metallized electrode and the reference electrode are both immersed in an electrolyte bath and are placed parallel to each other at a predetermined interval.

[0033] In step S106 provided in this application, both the target pre-metallized electrode and the reference electrode are immersed in an electrolyte bath. The target pre-metallized electrode and the reference electrode are placed parallel to each other at a predetermined interval so that the target electrical parameter value between the target pre-metallized electrode and the reference electrode can be measured by the device. The target electrical parameter value can be a voltage value or a resistance value, and can be customized according to the actual application and scenario.

[0034] Step S108: Based on the target comparison relationship, determine the target pre-metal element quantity corresponding to the target power parameter value, wherein the target comparison relationship is the comparison relationship between the power parameter value and the pre-metal element quantity;

[0035] In step S108 of this application, the target comparison relationship is the comparison relationship between the electrical parameter value and the amount of pre-metallic element. When the electrical parameter value is voltage, the target comparison relationship is the comparison relationship between different voltage values ​​and the corresponding amount of pre-metallic element. When the electrical parameter value is resistance, the target comparison relationship is the comparison relationship between different resistance values ​​and the corresponding amount of pre-metallic element. By measuring the target electrical parameter value, the actual amount of target pre-metallic element corresponding to the target pre-metallized electrode can be known, thus achieving the measurement of the target pre-metallic element amount simply and quickly.

[0036] Step S110: Based on the target pre-metal element amount and the preset pre-metal element amount, determine whether the target pre-metal element electrode has an abnormal pre-metal element amount fault result.

[0037] In step S110 of this application, based on the target pre-metal element amount and the preset pre-metal element amount, the failure result of whether the target pre-metallized electrode exhibits an abnormal pre-metal element amount fault is determined. If the target pre-metal element amount and the preset pre-metal element amount are the same or nearly the same, it indicates that the target pre-metallized electrode does not exhibit an abnormal pre-metal element amount fault. If the target pre-metal element amount and the preset pre-metal element amount differ significantly, it indicates that the target pre-metallized electrode exhibits an abnormal pre-metal element amount fault. This method allows for a quick and convenient determination of whether the target pre-metallized electrode is faulty.

[0038] Through the above steps S102-S110, a target pre-metallized electrode is obtained, and the target electrical parameter value between the target pre-metallized electrode and the reference electrode is measured. Based on the target comparison relationship, the target pre-metallized element quantity corresponding to the target electrical parameter value is determined, i.e., the actual pre-metallized element quantity of this pre-metallized electrode can be determined. Based on the actual target pre-metallized element quantity and the preset pre-metallized element quantity corresponding to the target pre-metallized electrode, it is determined whether the target pre-metallized electrode exhibits a fault result indicating an abnormal pre-metallized element quantity. As can be seen from the above steps, this embodiment of the invention determines the target pre-metallized element quantity by the target electrical parameter value between the target pre-metallized electrode and the reference electrode, thus allowing for the determination of the target pre-metallized element quantity through a simple comparison relationship. Furthermore, since both the target pre-metallized electrode and the reference electrode are immersed in an electrolyte bath and placed parallel to each other at a predetermined interval, the target electrical parameter value between them can be accurately determined, ensuring the accuracy of the determined pre-metallized element quantity. Finally, by directly comparing the target pre-metal element amount with the preset pre-metal element amount, it is determined whether the target pre-metallized electrode has an abnormal pre-metal element amount fault, thus achieving the purpose of fault determination. This solves the technical problem of complex measurement steps and difficult measurement when measuring pre-metallized electrode faults in related technologies.

[0039] As an optional embodiment, the fault result of whether the target pre-metallized electrode has an abnormal pre-metallization fault is determined based on the target pre-metallization element amount and the preset pre-metallization element amount, including: determining the preset pre-metallization element range corresponding to the preset pre-metallization element amount; and determining the fault result as an abnormal pre-metallization fault in the target pre-metallized electrode if the target pre-metallization element amount does not belong to the preset pre-metallization element range.

[0040] This embodiment describes how to determine whether a target pre-metallized electrode exhibits an abnormal pre-metallization fault based on the target pre-metallization amount and the preset pre-metallization amount. In this step, a preset pre-metallization range corresponding to the preset pre-metallization amount is determined. When the target pre-metallization amount falls within this range, it indicates that the target pre-metallization amount is the same as or nearly the same as the preset pre-metallization amount; in this case, it indicates that the target pre-metallized electrode does not exhibit an abnormal pre-metallization fault. When the target pre-metallization amount does not fall within this range, it indicates that the target pre-metallization amount differs significantly from the preset pre-metallization amount; in this case, it indicates that the target pre-metallized electrode exhibits an abnormal pre-metallization fault. This method allows for a quick and easy determination of whether a target pre-metallized electrode is faulty.

[0041] As an optional embodiment, the fault result of whether the target pre-metallized electrode has an abnormal pre-metall content is determined based on the target pre-metall content and the preset pre-metall content, including: when the target pre-metall content is one of multiple target pre-metall content determined within a predetermined time period, the fault result is determined based on the multiple target pre-metall content and the preset pre-metall content within the predetermined time period.

[0042] This embodiment describes the processing steps when the target pre-metal element quantity is one of multiple target pre-metal element quantities determined within a predetermined time period. At multiple time points within the predetermined time period, the electrical parameter values ​​between the two electrodes can be measured, thereby determining multiple target pre-metal element quantities. When determining the fault result based on the multiple target pre-metal element quantities within the predetermined time period and a preset pre-metal element quantity, various rules can be set. For example, if the pre-metal element quantity of most of the multiple target pre-metal element quantities exceeds the range corresponding to the preset pre-metal element quantity, it can be determined that there is a pre-metal element quantity abnormality fault. Because the electrical parameter detection may be affected by external factors, thus affecting the target pre-metal element quantity result, a comprehensive judgment can be made by determining multiple target pre-metal element quantities to determine whether there is a pre-metal element quantity abnormality fault, thus avoiding the influence of randomness and chance on the fault result.

[0043] As an optional embodiment, determining the target electrical parameter value between the target pre-metallized electrode and the reference electrode includes: when the length of the target pre-metallized electrode is greater than the length of the reference electrode and there are multiple target electrical parameter values, aligning the first side of the target pre-metallized electrode with the first side of the reference electrode; vertically moving the target pre-metallized electrode at a predetermined speed until the second side of the target pre-metallized electrode is aligned with the second side of the reference electrode, and determining the multiple target electrical parameter values ​​between the target pre-metallized electrode and the reference electrode during the movement.

[0044] In this embodiment, the case where the length of the target pre-metallized electrode is greater than the length of the reference electrode is described. In this case, the first side of the target pre-metallized electrode is aligned with the first side of the reference electrode. The target pre-metallized electrode is then moved vertically at a predetermined speed until the second side of the target pre-metallized electrode is aligned with the second side of the reference electrode, for example, aligning the lower side of the target pre-metallized electrode with the lower side of the reference electrode. The target pre-metallized electrode is then moved vertically at a predetermined speed until the upper side of the target pre-metallized electrode is aligned with the upper side of the reference electrode. During the measurement process, the electrical parameter values ​​between the target pre-metallized electrode and the reference electrode are continuously measured, ultimately yielding multiple target electrical parameter values. Based on these multiple target electrical parameter values, it can be determined whether the amount of pre-metallized element at various points on the target pre-metallized electrode meets the specified requirements.

[0045] As an optional embodiment, determining the target electrical parameter value between the target pre-metallized electrode and the reference electrode includes: when the width of the target pre-metallized electrode is greater than the width of the reference electrode and there are multiple target electrical parameter values, aligning the third side of the target pre-metallized electrode with the third side of the reference electrode; moving the target pre-metallized electrode laterally at a predetermined speed until the fourth side of the target pre-metallized electrode is aligned with the fourth side of the reference electrode, and determining the multiple target electrical parameter values ​​between the target pre-metallized electrode and the reference electrode during the movement.

[0046] In this embodiment, the case where the width of the target pre-metallized electrode is greater than the width of the reference electrode is described. In this case, the third side of the target pre-metallized electrode is aligned with the third side of the reference electrode. The target pre-metallized electrode is then moved vertically at a predetermined speed until the fourth side of the target pre-metallized electrode is aligned with the fourth side of the reference electrode, for example, aligning the left side of the target pre-metallized electrode with the left side of the reference electrode. The target pre-metallized electrode is then moved vertically at a predetermined speed until the right side of the target pre-metallized electrode is aligned with the right side of the reference electrode. During the measurement process, the electrical parameter values ​​between the target pre-metallized electrode and the reference electrode are continuously measured, ultimately yielding multiple target electrical parameter values. Based on these multiple target electrical parameter values, it can be determined whether the amount of pre-metallized element at various points on the target pre-metallized electrode meets the specified requirements.

[0047] As an optional embodiment, after measuring multiple target electrical parameter values ​​between the target pre-metallized electrode and the reference electrode during the movement, the method further includes: determining the difference between each pair of target electrical parameter values ​​to obtain a set of differences; and determining that the target pre-metallized electrode has a fault of uneven pre-metallization.

[0048] In this embodiment, after obtaining multiple power parameter values, the differences between each pair of target power parameter values ​​can be determined, resulting in a set of differences. This set of differences can be used to detect whether the target pre-metallized electrode exhibits a fault of uneven pre-metallization. If all differences are within a predetermined range, such as 0 or 1, it indicates that the target pre-metallized electrode is uniform. Conversely, if any of the differences are very large, it indicates that the target pre-metallized electrode is non-uniform, and a uniformity fault has occurred.

[0049] When electrodes with uneven pre-metal element content are used in battery assembly, it can lead to problems such as uneven expansion, localized metal precipitation, decreased cycle performance, poor safety performance, and poor battery consistency. Therefore, the method provided in this embodiment can quickly detect uniformity and avoid the above-mentioned problems.

[0050] As an optional embodiment, before determining the target pre-metallized element amount corresponding to the target electrical parameter value based on the target comparison relationship, the method further includes: determining multiple sample pre-metallized electrodes and a reference electrode, wherein the multiple sample pre-metallized electrodes correspond to different sample pre-metallized element amounts; determining multiple sample electrical parameter values ​​between the multiple sample pre-metallized electrodes and the reference electrode, wherein the multiple sample pre-metallized electrodes and the reference electrode are sequentially immersed in an electrolyte bath, and the corresponding sample pre-metallized electrodes and the reference electrode are placed parallel to each other at a predetermined interval; and determining the target comparison relationship based on the different sample pre-metallized element amounts corresponding to the multiple sample pre-metallized electrodes and the multiple sample electrical parameter values.

[0051] Before determining the target pre-metallization element amount corresponding to the target electrical parameter value based on the target reference relationship, it is necessary to first determine the target reference relationship. Therefore, this embodiment describes the steps for determining the target reference relationship. In this embodiment, multiple sample pre-metallized electrodes, each corresponding to a different sample pre-metallization element amount, and the aforementioned reference electrode electrode are determined. Multiple sample electrical parameter values ​​between the multiple sample pre-metallized electrodes and the reference electrode electrode are determined. The target reference relationship is determined based on the different sample pre-metallization element amounts corresponding to the multiple sample pre-metallized electrodes and the multiple sample electrical parameter values.

[0052] Among the multiple pre-metallized electrode sheets with different amounts of pre-metallized elements, the amount of pre-metallized elements can be obtained by assembling coin cells or small pouch cells to test capacity, or by dissolving the electrode sheet to test the concentration of metal ions. The following explanation uses a pre-lithiation electrode sheet as an example to illustrate the process:

[0053] Pre-lithiation determination using the concentration method: The pre-lithiated electrode is cut, mixed with a strong acid, and diluted with water to prepare a test solution. The concentration of lithium in the test solution is then measured. Finally, the pre-lithiation amount X (unit: mAh / mm²) on the electrode is calculated: X = C*V*K / 1000000 / S, where C is the concentration of lithium in the test solution (μg / mL); S is the area of ​​the pre-lithiated electrode; V is the volume of the test solution (mL); and K is the specific capacity of lithium (3700 mAh / g). Preferably, the strong acid is a mixture of nitric acid and hydrochloric acid. Preferably, the concentration of lithium in the test solution is detected using inductively coupled plasma atomic emission spectrometry (ICP) or atomic absorption spectrometry (AAS).

[0054] Capacitance testing of pre-lithiation capacity: Pre-lithiated electrode sheets (unpre-lithiated electrodes in the control group), separators, and lithium sheets were cut; the area ratio of the pre-lithiated electrode sheet (unpre-lithiated electrode sheet in the control group) to the lithium sheet area was 0.5:1; assembled into button cells or small pouch cells; the button cells were left to stand for 8-32 hours; the button cells were discharged at a discharge current density of 1uA / cm² - 1mA / cm², and the discharge capacity was read at a discharge cutoff voltage of 0.005V. The capacity of the pre-lithiated electrode sheet was recorded as a1 (mAh); the capacity of the unpre-lithiated electrode sheet was a2 (mAh). The actual pre-lithiated capacity X (mAh / mm²) was calculated as X = (a2 / S2 - a1 / S1), where S1 is the area of ​​the pre-lithiated electrode sheet and S2 is the area of ​​the unpre-lithiated electrode sheet.

[0055] It should be noted that when measuring multiple sample electrical parameter values ​​between multiple sample pre-metallized electrodes and reference electrode electrodes, multiple sample pre-metallized electrodes must be immersed in the electrolyte bath sequentially along with the reference electrode electrode. The corresponding sample pre-metallized electrodes and reference electrode electrodes are placed parallel to each other at a predetermined interval to ensure that the environment for generating the target control relationship is the same, and to ensure that the measured amount of target pre-metallized elements is accurate when the target control relationship is used subsequently.

[0056] Based on the above embodiments and optional embodiments, a method for determining the pre-metal element content of a pre-metallized electrode with optional implementation is provided. This method enables real-time online monitoring at fixed points, and is simple, convenient, efficient, non-destructive, and highly accurate. It can precisely measure the pre-metal element content at a specified location, ensuring the consistency of the pre-metal element content, and has strong universality, making it suitable for industrial applications. Taking a pre-lithiation electrode as an example, the following is a detailed description.

[0057] (a) Pre-lithiation determination system:

[0058] The pre-lithiation quantity determination system consists of a pre-lithiation quantity determination device, a signal feedback device, and a pre-lithiation cell parameter controller. Figure 2 A schematic diagram of the pre-lithium quantity determination system provided in an optional embodiment of the present invention is shown below. Figure 2 As shown.

[0059] The pre-lithiation determination device consists of a pre-lithiated electrode (same as the target pre-lithiated electrode), a counter electrode (same as the reference electrode), an electrolyte, and a voltage and resistance measuring instrument.

[0060] The signal feedback device, as shown in the figure, is a signal feedback system that can collect parameters such as voltage and time, establish a database of the relationship between voltage and pre-lithiation amount, and provide automatic feedback. The signal feedback device is also interconnected with a voltage and resistance meter and a pre-lithiation cell parameter controller to achieve closed-loop feedback.

[0061] The pre-lithiated electrode and the counter electrode are connected by an external frame to ensure that the electrode is flat and does not bend or deform, and to ensure that the spacing is uniform. The size of the counter electrode is less than or equal to that of the pre-lithiated electrode. The pre-lithiated electrode and the counter electrode will not react spontaneously. One end of the voltmeter is connected to the pre-lithiated electrode, and the other end is connected to the counter electrode.

[0062] (II) Method for determining pre-lithiation amount:

[0063] S1, Obtain the target pre-lithiated electrode;

[0064] S2, determine the preset pre-lithiation amount of the target pre-lithiated electrode;

[0065] S3, Measure the target electrical parameter value between the target pre-lithiation electrode and the reference electrode. Both the target pre-lithiation electrode and the reference electrode are immersed in the electrolyte pool. Both electrodes can be fixed by an external frame to prevent bending or other phenomena. The target pre-lithiation electrode and the reference electrode are placed parallel to each other at a predetermined interval.

[0066] S4. Based on the target comparison relationship, determine the target pre-lithiation amount corresponding to the target power parameter value, wherein the target comparison relationship is the comparison relationship between the power parameter value and the pre-lithiation amount. Figure 3 A schematic diagram showing the relationship between voltage and pre-lithiation amount is provided for an optional embodiment of the present invention, as shown below. Figure 3 As shown, it records as follows Figure 3 The comparison relationship shown;

[0067] S5, based on the target pre-lithiation amount and the preset pre-lithiation amount, determine whether the target pre-lithiation electrode has a pre-lithiation amount abnormality fault result;

[0068] S5 sends an alarm signal to a predetermined terminal in the event of an abnormal pre-lithiation fault in the target pre-lithiation electrode.

[0069] S6 adjusts the process promptly based on the signal.

[0070] It should be noted that when the length of the target pre-lithiated electrode is greater than the length of the reference electrode, and there are multiple target electrical parameter values, the first side corresponding to the target pre-lithiated electrode is aligned with the first side corresponding to the reference electrode; the target pre-lithiated electrode is moved vertically at a predetermined speed until the second side corresponding to the target pre-lithiated electrode is aligned with the second side corresponding to the reference electrode, and the multiple target electrical parameter values ​​between the target pre-lithiated electrode and the reference electrode are measured during the movement.

[0071] When the width of the target pre-lithiated electrode is greater than the width of the reference electrode, and there are multiple target electrical parameter values, align the third side of the target pre-lithiated electrode with the third side of the reference electrode; move the target pre-lithiated electrode laterally at a predetermined speed until the fourth side of the target pre-lithiated electrode is aligned with the fourth side of the reference electrode, and measure the multiple target electrical parameter values ​​between the target pre-lithiated electrode and the reference electrode during the movement.

[0072] Taking a counter electrode with dimensions of 4mm*4mm, a pre-lithiated electrode with a width of 126mm, and a distance of 10mm between the two electrodes as an example, the above description allows the conveyor belt to rotate at a predetermined speed or the counter electrode to move in parallel, ensuring that the voltage between the pre-lithiated electrode and the counter electrode can be measured at various points.

[0073] In this way, lithium intercalation can be basically uniform within a predetermined fluctuation range for multiple target power parameter values. After the electrode is used for battery assembly, it will not cause problems such as uneven expansion, local lithium plating, cycle performance degradation, poor safety performance, and poor battery consistency.

[0074] The above optional implementation methods can achieve at least the following beneficial effects:

[0075] The optional embodiments of this invention can perform real-time online detection of the uniformity of lithium embedding on the electrode at fixed points. When uneven lithium embedding occurs on the electrode, the pre-lithiation process cannot be adjusted in time. The manufactured batteries have high electrical and safety performance, high battery consistency, and high assembly rate. Moreover, the method is simple, efficient, non-destructive, and highly accurate, accurately measuring the pre-lithiation amount at a specified location, ensuring the consistency of pre-lithiation, and has strong versatility, making it suitable for industrialization and with broad application prospects.

[0076] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0077] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0078] Example 2

[0079] According to embodiments of the present invention, an apparatus for implementing the above-described method for determining faults in pre-metallized electrode sheets is also provided. Figure 4 This is a structural block diagram of a fault determination device for pre-metallized electrode sheets according to an embodiment of the present invention, as shown below. Figure 4 As shown, the device includes: an acquisition module 402, a first determination module 404, a measurement module 406, a second determination module 408, and a third determination module 410. The device will be described in detail below.

[0080] The system comprises: an acquisition module 402 for acquiring a target pre-metallized electrode; a first determination module 404 connected to the acquisition module 402 for determining a preset pre-metallized element amount of the target pre-metallized electrode; a measurement module 406 connected to the first determination module 404 for measuring a target electrical parameter value between the target pre-metallized electrode and a reference electrode, wherein both the target pre-metallized electrode and the reference electrode are immersed in an electrolyte bath and are placed parallel to each other at a predetermined interval; a second determination module 408 connected to the measurement module 406 for determining a target pre-metallized element amount corresponding to the target electrical parameter value based on a target reference relationship, wherein the target reference relationship is a reference relationship between the electrical parameter value and the pre-metallized element amount; and a third determination module 410 connected to the second determination module 408 for determining whether the target pre-metallized electrode exhibits a fault result indicating an abnormal pre-metallized element amount based on the target pre-metallized element amount and the preset pre-metallized element amount.

[0081] It should be noted here that the above-mentioned acquisition module 402, first determination module 404, measurement module 406, second determination module 408 and third determination module 410 correspond to steps S102 to S110 in the fault determination method for implementing pre-metallized electrode sheets. The multiple modules and the corresponding steps are the same in terms of implementation examples and application scenarios, but are not limited to the content disclosed in the above embodiment 1.

[0082] Example 3

[0083] According to another aspect of the present invention, an electronic device is also provided, comprising: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute the instructions to implement the fault determination method for pre-metallized electrode as described above.

[0084] Example 4

[0085] According to another aspect of the present invention, a computer-readable storage medium is also provided, which, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the fault determination method for pre-metallized electrode as described above.

[0086] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0087] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0090] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0092] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method of failure determination of a pre-metal elementized electrode, characterized by, The method comprises: obtaining a target pre-metal elementized electrode plate; determining a preset pre-metal element amount of the target pre-metal elementized electrode plate; measuring a target electric power parameter value between the target pre-metal elementized electrode plate and a reference electrode plate, wherein the target pre-metal elementized electrode plate and the reference electrode plate are both immersed in an electrolyte pool, and the target pre-metal elementized electrode plate and the reference electrode plate are placed in parallel with a predetermined interval; determining a target pre-metal element amount corresponding to the target electric power parameter value according to a target control relationship, wherein the target control relationship is a control relationship between an electric power parameter value and a pre-metal element amount; determining a fault result of whether the target pre-metal elementized electrode plate has a pre-metal element amount abnormal fault according to the target pre-metal element amount and the preset pre-metal element amount.

2. The method of claim 1, wherein, The determining a fault result of whether the target pre-metal elementized electrode plate has a pre-metal element amount abnormal fault according to the target pre-metal element amount and the preset pre-metal element amount comprises: determining a preset pre-metal element range corresponding to the preset pre-metal element amount; in a case where the target pre-metal element amount does not belong to the preset pre-metal element range, determining that the fault result is that the target pre-metal elementized electrode plate has the pre-metal element amount abnormal fault.

3. The method of claim 1, wherein, The determining a fault result of whether the target pre-metal elementized electrode plate has a pre-metal element amount abnormal fault according to the target pre-metal element amount and the preset pre-metal element amount comprises: in a case where the target pre-metal element amount is a plurality of target pre-metal element amounts determined within a predetermined time period, determining the fault result according to the plurality of target pre-metal element amounts within the predetermined time period and the preset pre-metal element amount.

4. The method of claim 1, wherein, The measuring a target electric power parameter value between the target pre-metal elementized electrode plate and a reference electrode plate comprises: in a case where a length of the target pre-metal elementized electrode plate is greater than a length of the reference electrode plate and the target electric power parameter value is a plurality of target electric power parameter values, aligning a first side edge of the target pre-metal elementized electrode plate with a first side edge of the reference electrode plate; vertically moving the target pre-metal elementized electrode plate at a predetermined speed until a second side edge of the target pre-metal elementized electrode plate is aligned with a second side edge of the reference electrode plate, and measuring a plurality of target electric power parameter values between the target pre-metal elementized electrode plate and the reference electrode plate during the moving.

5. The method of claim 1, wherein, The measuring a target electric power parameter value between the target pre-metal elementized electrode plate and a reference electrode plate comprises: in a case where a width of the target pre-metal elementized electrode plate is greater than a width of the reference electrode plate and the target electric power parameter value is a plurality of target electric power parameter values, aligning a third side edge of the target pre-metal elementized electrode plate with a third side edge of the reference electrode plate; Transversely moving the target pre-metal elementization electrode piece at a predetermined speed until a fourth side of the target pre-metal elementization electrode piece is aligned with a fourth side of the reference electrode piece, and measuring a plurality of target power parameter values between the target pre-metal elementization electrode piece and the reference electrode piece during the moving.

6. The method of claim 4, wherein, After the measuring, the method further includes: determining a difference between each pair of the plurality of target power parameter values to obtain a difference set; in a case where a difference in the difference set is greater than a predetermined difference, determining that the target pre-metal elementization electrode piece has a pre-metal element amount unevenness fault.

7. The method according to any one of claims 1 to 6, characterized in that, Before the determining, the method further includes: determining a plurality of sample pre-metal elementization electrode pieces and the reference electrode piece, wherein the plurality of sample pre-metal elementization electrode pieces respectively correspond to different sample pre-metal element amounts; respectively determining a plurality of sample power parameter values between the plurality of sample pre-metal elementization electrode pieces and the reference electrode piece, wherein the plurality of sample pre-metal elementization electrode pieces are sequentially immersed in an electrolyte pool together with the reference electrode piece, and the corresponding sample pre-metal elementization electrode piece and the reference electrode piece are placed in parallel with a predetermined interval; determining the target control relationship according to the plurality of sample pre-metal elementization electrode pieces respectively corresponding to different sample pre-metal element amounts and the plurality of sample power parameter values.

8. A pre-metal elementized electrode failure determination apparatus, characterized by, The method includes: an acquisition module configured to acquire a target pre-metal elementization electrode piece; a first determination module configured to determine a preset pre-metal element amount of the target pre-metal elementization electrode piece; a measurement module configured to measure a target power parameter value between the target pre-metal elementization electrode piece and a reference electrode piece, wherein the target pre-metal elementization electrode piece and the reference electrode piece are immersed in an electrolyte pool, and the target pre-metal elementization electrode piece and the reference electrode piece are placed in parallel with a predetermined interval; a second determination module configured to determine a target pre-metal element amount corresponding to the target power parameter value according to a target control relationship, wherein the target control relationship is a control relationship between a power parameter value and a pre-metal element amount; a third determination module configured to determine a fault result of whether the target pre-metal elementization electrode piece has a pre-metal element amount abnormality fault according to the target pre-metal element amount and the preset pre-metal element amount.

9. An electronic device, comprising: The method includes: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the fault determination method of the pre-metal elementization electrode piece according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is enabled to perform the fault determination method of the pre-metal elementization electrode piece according to any one of claims 1 to 7.

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