Lithium battery interface black spot control method and device and electronic equipment

Abstract

The invention discloses a lithium battery interface black spot control method and device and electronic equipment, and relates to the technical field of lithium battery, the control method comprises the following steps: determining a preset control condition, adopting a formation blocking test tool to simulate a battery cell, putting the formation blocking test tool into a formation cabinet body for simulation test to obtain actual simulation test data, when it is judged that the actual simulation test data meet a first control condition, carrying out an empty-pumping test on the formation cabinet to obtain actual empty-pumping test data, and when it is judged that the actual empty-pumping test data meet a second control condition, putting the battery cell into the formation cabinet to carry out a formation test to obtain actual formation test data, and judging whether the actual formation test data meet a third control condition or not, and completing the control of the lithium battery interface black spots under the condition that the actual formation test data meet the third control condition. According to the invention, the technical problem that black spots are generated on the battery cell interface due to improper negative pressure control in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a method and device for controlling black spots on the interface of a lithium battery, and an electronic device. Background Art

[0002] With the application of LFP (Lithium Iron Phosphate) lithium batteries in power and energy storage, corresponding battery cell interface problems (such as interface improvement and identification) have emerged. During the initial charge and discharge activation process of lithium batteries, if the lithium insertion reaction on the surface of the negative electrode sheet is abnormal, black spots where lithium is not fully inserted will form on the graphite surface. And under low SOC (State of Charge) conditions, since the color of the negative electrode surface does not show a significant golden color, the visual detection of black spots becomes complicated and difficult to effectively identify.

[0003] Compared with the SEI (solid electrolyte interface) membrane in the normal area, the SEI membrane in the black spot area has segregated element content, abnormal chemical composition, and graphite particles floating on the surface of the pole piece, which is prone to obvious morphological abnormalities, loose and disordered structure, and significantly increased gaps. In the depth range of 0-200nm, the element content of Li (lithium), O (oxygen) and F (fluorine) in the black spot area is higher than that in the normal area, causing it to appear inward. Therefore, the key feature of black spot formation is the excessive thickening of the SEI film and the embedding of lithium-containing compounds.

[0004] The current analysis schemes for the status quo of black spots on the interface of lithium batteries mainly include: (1) Visual inspection method, which mainly involves fully charging and disassembling risky cells and manually identifying interface defects. It can visually observe the location, shape, size and distribution of black spots, quickly lock obvious black spots on the surface, and timely analyze lithium batteries in the production process, timely discover problems and adjust the production process. However, it is difficult to detect black spots at the internal or microscopic level. The recognition accuracy of tiny black spots with unclear color differences is limited. It is easily affected by environmental factors such as lighting and angle, as well as reflections and stains on the battery surface. It requires high professional skills for personnel and is prone to misjudgment or missed judgment. (2) Scanning electron microscope analysis method, which is mainly used for morphological analysis of black spot areas. It can provide high-resolution microscopic morphological images, clearly display the microstructure of the black spot area, analyze the elemental composition and distribution of the black spots, help determine the cause of the black spots, and has high detection sensitivity and accuracy for tiny and hidden black spots. However, the equipment is expensive, the detection cost is high, the operation is complicated, and professional technicians are required to operate. The detection speed is slow and it is not suitable for large-scale and rapid detection. In addition, the sample needs to be pre-treated, which may cause certain damage or changes to the sample. (3) Energy spectrum analysis method, which is mainly used for component analysis of black spot area, can accurately determine the type and content of elements in and around the black spot area, provide accurate chemical composition information for the cause analysis of black spot, can detect trace elements, and help to find black spot problems caused by impurities or element abnormalities. Combined with scanning electron microscopy and other technologies, it can comprehensively and deeply study the characteristics of black spots. However, the equipment cost is high, the operation is complicated, and the detection range is limited. It can only analyze the element information within a certain depth of the sample surface. It is difficult to accurately detect the element distribution in the deeper interior, and the detection results are affected by factors such as sample surface flatness and conductivity. (4) Electrochemical testing method, which can indirectly reflect the impact of black spots on battery performance by measuring the electrochemical parameters of the battery such as voltage, current, and internal resistance, and evaluate whether black spots cause internal short circuits, polarization, etc. of the battery. It can monitor in real time during the battery charging and discharging process, understand the dynamic influence of black spots on battery performance, and provide important basis for the evaluation and solution of black spot problems. However, the morphology and position of black spots cannot be directly observed, and the qualitative analysis capability of black spots is limited. The existence and influence of black spots can only be inferred from the perspective of changes in electrochemical performance. In addition, electrochemical testing is easily affected by various factors, such as test environment temperature, humidity, charge and discharge system, etc., and the test conditions need to be strictly controlled to ensure the accuracy of the results.

[0005] During the charging process of battery cells, black spots on the surface of the negative electrode are one of the interface defects. Interface black spot defects may lead to low capacitance, abnormal voltage, abnormal capacity, etc. The formation process of black spots is often accompanied by the generation of lithium precipitation, insufficient lithium insertion in graphite, loss of active sites, deterioration of kinetic performance, etc., which bury many hidden dangers for subsequent battery safety. Therefore, in order to solve the above black spot problem, many aspects of research have been carried out, such as increasing monitoring specifications such as temperature control, negative pressure control, and moisture control, and artificially adjusting the oven temperature, negative pressure, time control, etc., as well as adjusting the formation current from a process perspective, increasing the immersion time to optimize the interface SEI film formation, and improving the black spot problem.

[0006] However, the root cause of the generation and control of black spots has not been solved. Black spots will still occur in different batches of graphite or when there are major adjustments to the process. At the same time, the black spots are more serious on the interface after formation. As a result, in the actual production process, it is necessary to manually adjust the baking temperature and baking time repeatedly, which is heavily dependent on the skill level of production technicians. The consistency of the interface is also affected. Although measures such as increasing the baking time can alleviate the black spot problem, they will affect the production capacity of the battery cells.

[0007] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0008] The embodiments of the present invention provide a method and device for controlling black spots on the interface of a lithium battery, and an electronic device thereof, so as to at least solve the technical problem in the related art that black spots are generated on the interface of a battery cell due to improper negative pressure control.

[0009] According to one aspect of an embodiment of the present invention, a method for controlling black spots on the interface of a lithium battery is provided, comprising: determining preset control conditions, wherein the preset control conditions are used to control the battery cells of the lithium battery to not form black spots during a formation test, and the preset control conditions at least include: a first control condition, a second control condition, and a third control condition; using a formation plugging detection tool to simulate the battery cell, and placing the formation plugging detection tool into a formation cabinet for simulation testing to obtain actual simulation test data, and judging whether the actual simulation test data satisfies the first control condition; when the actual simulation test data satisfies the first control condition, performing an empty pumping test on the formation cabinet to obtain actual empty pumping test data, and judging whether the actual empty pumping test data satisfies the second control condition; when the actual empty pumping test data satisfies the second control condition, placing the battery cell into the formation cabinet for formation testing to obtain actual formation test data, and judging whether the actual formation test data satisfies the third control condition; when the actual formation test data satisfies the third control condition, completing the control of the black spots on the interface of the lithium battery.

[0010] Further, the formation blockage detection tooling includes at least: a negative pressure meter, and the step of determining the first control condition includes: for multiple formation cabinets, using the negative pressure meter to collect historical negative pressure value data according to a first preset time interval, and constructing multiple first negative pressure curves based on all the collected historical negative pressure value data, wherein the horizontal coordinate of the first negative pressure curve is a discrete collection time constituted by the collection moments of multiple historical negative pressure value data, and the vertical coordinate of the first negative pressure curve is the historical negative pressure value data corresponding to each collection moment; based on each of the first negative pressure curves, judging whether the difference between the historical negative pressure value data corresponding to each two adjacent collection moments is less than a preset difference threshold; when the difference between the historical negative pressure value data corresponding to two adjacent collection moments is less than the preset difference threshold, determining the duration corresponding to the latter of the two adjacent collection moments as the preset blockage detection duration; determining the first control condition based on each of the historical negative pressure value data and the preset blockage detection duration.

[0011] Furthermore, based on each of the historical negative pressure value data and the preset blockage measurement time, the step of determining the first control condition includes: performing mean calculation on multiple historical negative pressure value data to obtain the mean of the historical negative pressure value data, and performing standard deviation calculation on the historical negative pressure value data based on the mean to obtain the standard deviation of the historical negative pressure value data; multiplying the standard deviation of the historical negative pressure value data by a preset multiple to obtain a preset standard deviation; adding the mean to the preset standard deviation to obtain a preset standard negative pressure value; and determining the condition that the actual measured negative pressure value at the preset blockage measurement time is greater than the preset standard negative pressure value as the first control condition.

[0012] Furthermore, the step of determining the second control condition includes: collecting historical air pumping test data, wherein the historical air pumping test data at least includes: historical air pumping negative pressure value, preset air pumping time, the historical air pumping negative pressure value refers to the negative pressure value measured when the air pumping time reaches the preset air pumping time; the condition that the actual measured negative pressure value is less than the historical air pumping negative pressure value is determined as the second control condition.

[0013] Further, the formation cabinet at least includes: a negative pressure table, and the step of determining the third control condition includes: for multiple formation cabinets, determining a standard negative pressure value for each formation cabinet to form a battery cell; according to a first preset time interval, using the negative pressure table to collect historical negative pressure value data, and constructing a second negative pressure curve based on all the collected historical negative pressure value data, wherein the abscissa of the second negative pressure curve is a discrete collection time composed of collection moments of multiple historical negative pressure value data, and the ordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each collection moment; based on the second negative pressure curve, judging the time required for the historical negative pressure value data to reach the standard negative pressure value, and determining the time as the standard formation time; determining the third control condition based on the standard negative pressure value and the standard formation time.

[0014] Furthermore, based on the standard negative pressure value and the standard formation time, the step of determining the third control condition includes: calculating the mean of multiple standard formation time periods to obtain the mean of the standard formation time periods, and calculating the standard deviation of the standard formation time periods based on the mean to obtain the standard deviation of the standard formation time periods; multiplying the standard deviation by a preset multiple to obtain a preset time standard deviation; adding the mean to the preset time standard deviation to obtain a preset standard formation time; and determining the condition that the actually measured negative pressure value reaches the standard negative pressure value within the preset standard formation time period as the third control condition.

[0015] Further, after determining the preset control conditions, it also includes: determining the black spot level based on the preset control conditions, wherein the black spot level includes at least: a first level, a second level, and a third level; when the first control condition, the second control condition, and the third control condition are simultaneously satisfied, the black spot level is determined to be the first level; when at least one of the first control condition, the second control condition, and the third control condition is satisfied, the black spot level is determined to be the second level; when the first control condition, the second control condition, and the third control condition are not simultaneously satisfied, the black spot level is determined to be the third level.

[0016] Furthermore, the method for controlling black spots on the interface of a lithium battery also includes: when the actual simulation test data does not meet the first control condition, displaying that the formation cabinet is abnormal in a preset system acquisition software program module, and disabling the formation cabinet; or, when the actual vacuum test data does not meet the second control condition, displaying that the formation cabinet is abnormal in the preset system acquisition software program module, and disabling the formation cabinet; or, when the actual formation test data does not meet the third control condition, displaying that the formation cabinet is abnormal in the preset system acquisition software program module, and disabling the formation cabinet.

[0017] According to another aspect of an embodiment of the present invention, a control device for black spots on the interface of a lithium battery is also provided, comprising: a first determining unit, used to determine a preset control condition, wherein the preset control condition is used to control the battery cell of the lithium battery to not form black spots during a formation test, and the preset control condition at least includes: a first control condition, a second control condition, and a third control condition; a first judging unit, used to use a formation plugging detection tool to simulate the battery cell, and put the formation plugging detection tool into a formation cabinet for a simulation test to obtain actual simulation test data, and judge whether the actual simulation test data meets the first control condition; a second judging unit, used to determine whether the actual simulation test data meets the first control condition; and a second judging unit, used to determine whether the actual simulation test data meets the first control condition. When the actual simulation test data meets the first control condition, the formation cabinet is subjected to an air pumping test to obtain actual air pumping test data, and it is judged whether the actual air pumping test data meets the second control condition; the third judgment unit is used to place the battery cell into the formation cabinet for a formation test to obtain actual formation test data, and to judge whether the actual formation test data meets the third control condition when the actual air pumping test data meets the second control condition; the first completion unit is used to complete the control of black spots on the lithium battery interface when the actual formation test data meets the third control condition.

[0018] Further, the formation blockage detection tooling includes at least: a negative pressure meter, and the first determination unit includes: a first construction module, which is used to collect historical negative pressure value data for multiple formation cabinets according to a first preset time interval using the negative pressure meter, and construct multiple first negative pressure curves based on all the collected historical negative pressure value data, wherein the horizontal coordinate of the first negative pressure curve is a discrete collection time composed of the collection moments of multiple historical negative pressure value data, and the vertical coordinate of the first negative pressure curve is the historical negative pressure value data corresponding to each collection moment; a first judgment module, which is used to judge whether the difference between the historical negative pressure value data corresponding to each two adjacent collection moments is less than a preset difference threshold based on each first negative pressure curve; a first determination module, which is used to determine the duration corresponding to the latter collection moment of the two adjacent collection moments as the preset blockage detection duration when the difference between the historical negative pressure value data corresponding to the two adjacent collection moments is less than the preset difference threshold; a second determination module, which is used to determine the first control condition based on each historical negative pressure value data and the preset blockage detection duration.

[0019] Furthermore, the second determination module includes: a first calculation submodule, used to perform mean calculation on multiple historical negative pressure value data to obtain the mean of the historical negative pressure value data, and based on the mean, perform standard deviation calculation on the historical negative pressure value data to obtain the standard deviation of the historical negative pressure value data; a second calculation submodule, used to multiply the standard deviation of the historical negative pressure value data by a preset multiple to obtain a preset standard deviation; a third calculation submodule, used to add the mean to the preset standard deviation to obtain a preset standard negative pressure value; the first determination submodule, used to determine the condition that the actual measured negative pressure value at the preset blockage measurement time is greater than the preset standard negative pressure value as the first control condition.

[0020] Furthermore, the first determination unit includes: a first acquisition module, used to collect historical air pumping test data, wherein the historical air pumping test data at least includes: a historical air pumping negative pressure value, a preset air pumping time, and the historical air pumping negative pressure value refers to the negative pressure value measured when the air pumping time reaches the preset air pumping time; a third determination module, used to determine the condition that the actual measured negative pressure value is less than the historical air pumping negative pressure value as the second control condition.

[0021] Further, the formation cabinet at least includes: a negative pressure table, and the first determination unit includes: a fourth determination module, which is used to determine the standard negative pressure value of each formation cabinet for battery cell formation for multiple formation cabinets; a second construction module, which is used to collect historical negative pressure value data using the negative pressure table according to a first preset time interval, and construct a second negative pressure curve based on all the collected historical negative pressure value data, wherein the abscissa of the second negative pressure curve is a discrete collection time composed of collection moments of multiple historical negative pressure value data, and the ordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each collection moment; a second judgment module, which is used to judge the time required for the historical negative pressure value data to reach the standard negative pressure value based on the second negative pressure curve, and determine the time as the standard formation time; a fifth determination module, which is used to determine the third control condition based on the standard negative pressure value and the standard formation time.

[0022] Further, the fifth determination module includes: a fourth calculation submodule, which is used to perform mean calculation on multiple standard formation time lengths to obtain the mean of the standard formation time lengths, and based on the mean, perform standard deviation calculation on the standard formation time length to obtain the standard deviation of the standard formation time length; a fifth calculation submodule, which is used to multiply the standard deviation by a preset multiple to obtain a preset time standard deviation; a sixth calculation submodule, which is used to add the mean to the preset time standard deviation to obtain a preset standard formation time length; a second determination submodule, which is used to determine the condition that the actual measured negative pressure value reaches the standard negative pressure value within the preset standard formation time length as the third control condition.

[0023] Further, the control device includes: a sixth determination module, used to determine the black spot level based on the preset control condition after determining the preset control condition, wherein the black spot level includes at least: a first level, a second level, and a third level; a seventh determination module, used to determine the black spot level as the first level when the first control condition, the second control condition and the third control condition are simultaneously met; an eighth determination module, used to determine the black spot level as the second level when at least one of the first control condition, the second control condition and the third control condition is met; and a ninth determination module, used to determine the black spot level as the third level when the first control condition, the second control condition and the third control condition are not simultaneously met.

[0024] Further, the control device includes: a first processing module, used for displaying that the formation cabinet is abnormal in the preset system acquisition software program module and disabling the formation cabinet when the actual simulation test data does not meet the first control condition; a second processing module, used for displaying that the formation cabinet is abnormal in the preset system acquisition software program module and disabling the formation cabinet when the actual vacuum test data does not meet the second control condition; and a third processing module, used for displaying that the formation cabinet is abnormal in the preset system acquisition software program module and disabling the formation cabinet when the actual formation test data does not meet the third control condition.

[0025] According to another aspect of an embodiment of the present invention, a computer program product is also provided, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for controlling black spots on the interface of a lithium battery as described above is implemented.

[0026] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the above-mentioned methods for controlling black spots on the interface of a lithium battery.

[0027] In the present invention, preset control conditions are determined, a formation plugging detection tool is used to simulate a battery cell, and the formation plugging detection tool is placed in a formation cabinet for simulation testing to obtain actual simulation test data, and it is judged whether the actual simulation test data meets a first control condition. When the actual simulation test data meets the first control condition, an air pumping test is performed on the formation cabinet to obtain actual air pumping test data, and it is judged whether the actual air pumping test data meets a second control condition. When the actual air pumping test data meets the second control condition, the battery cell is placed in a formation cabinet for formation testing to obtain actual formation test data, and it is judged whether the actual formation test data meets a third control condition. When the actual formation test data meets the third control condition, the control of black spots on the interface of the lithium battery is completed, thereby solving the technical problem of black spots generated on the interface of the battery cell due to improper negative pressure control in the related art.

[0028] In the present invention, by determining the first control condition, the second control condition and the third control condition, using a formation plugging detection tool to simulate a battery cell, and placing the formation plugging detection tool into a formation cabinet for simulation testing, actual simulation test data can be obtained. First, it can be determined whether the actual simulation test data meets the first control condition. When the actual simulation test data meets the first control condition, an empty pumping test is performed on the formation cabinet to obtain actual empty pumping test data. Then, it can be determined whether the actual empty pumping test data meets the second control condition. When the actual empty pumping test data meets the second control condition, the battery cell is placed in a formation cabinet for formation testing to obtain actual formation test data. Afterwards, it can be determined whether the actual formation test data meets the third control condition. When the actual formation test data meets the third control condition, control of black spots on the interface of the lithium battery is completed, the problem of uncontrolled negative pressure extraction of the battery cell is solved, the generation of black spots on the negative electrode surface of the lithium battery cell in the first charge and discharge activation stage is effectively controlled, and the technical effect of black spot suppression is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a flow chart of an optional method for controlling black spots on the interface of a lithium battery according to an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of the working principle of an optional formation negative pressure system according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of an optional control device for black spots on the interface of a lithium battery according to an embodiment of the present invention;

[0033] Figure 4 The hardware structure block diagram of an electronic device (or mobile device) for a method for controlling black spots on a lithium battery interface according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] 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.

[0035] 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, the terms "including" and "having" and any variations thereof are 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] It should be noted that the relevant information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) collected and involved in the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data are in compliance with the relevant laws, regulations and standards of the relevant regions, necessary confidentiality measures are taken, and public order and good customs are not violated, and corresponding operation entrances are provided for users to choose to authorize or refuse. For example, an interface is set between the system and the relevant users or organizations. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or organization through the interface, and obtain relevant information after receiving the consent information fed back by the aforementioned user or organization.

[0037] In the present invention, the deviation of negative pressure from the specification range will lead to the generation of black spots on the interface. In order to solve the problem of black spots caused by the unbalanced production and exhaust caused by the negative pressure exceeding the specification, which leads to the broken bridge of lithium ion interface transmission, a negative pressure monitoring and evaluation system is formed, and an MES (Manufacturing Execution System) system acquisition software program module is added. No reagents are required, which is safe and environmentally friendly, thereby solving the problem of uncontrolled negative pressure extraction in the battery cell.

[0038] The present invention is described in detail below in conjunction with various embodiments.

[0039] Embodiment 1

[0040] According to an embodiment of the present invention, an embodiment of a method for controlling black spots on the interface of a lithium battery is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0041] Figure 1is a flow chart of an optional method for controlling black spots on the lithium battery interface according to an embodiment of the present invention, such as Figure 1 As shown, the method comprises the following steps:

[0042] Step S101, determining preset control conditions, wherein the preset control conditions are used to control the battery cells of the lithium battery to not form black spots during the formation test, and the preset control conditions at least include: a first control condition, a second control condition, and a third control condition.

[0043] Optionally, the preset control conditions refer to a series of precise negative pressure control standards set during the formation test to prevent black spots from forming on the interface of the battery cell.

[0044] In this embodiment, the preset control conditions may include a first control condition (such as M1), a second control condition (such as M2) and a third control condition (such as M3), which can respectively perform negative pressure control for the formation blockage tooling simulation test, the formation cabinet vacuum test and the battery cell formation test.

[0045] Step S102, using a formation plugging test tool to simulate a battery cell, and placing the formation plugging test tool into a formation cabinet to perform a simulation test, obtaining actual simulation test data, and determining whether the actual simulation test data meets the first control condition.

[0046] Optionally, the formation blockage detection tool is a device used to simulate the state of the battery cell in the formation cabinet. It can include monitoring tools such as a negative pressure gauge to simulate and test the negative pressure response of the battery cell during the formation process.

[0047] In this embodiment, according to the first control condition (such as the blockage measurement time is 1 minute, and after 1 minute, the actual negative pressure value is stabilized at -70kPa (Kilopascal, i.e., unit of pressure)), the actual negative pressure value and time data can be collected and recorded through the negative pressure gauge of the formation blockage measurement tooling to evaluate whether the actual negative pressure state is stable and reaches -70kPa. If the actual simulation test data (i.e., blockage measurement time, actual negative pressure value) meets the first control condition, it indicates that the negative pressure control of the formation cabinet under the battery cell simulation state meets the requirements, which provides a basis for subsequent testing.

[0048] Step S103, when the actual simulation test data meets the first control condition, perform an air pumping test on the formation cabinet to obtain actual air pumping test data, and determine whether the actual air pumping test data meets the second control condition.

[0049] Optionally, when the actual simulation test data meets the first control condition, an air pumping test may be performed on the formation cabinet. The air pumping test of the formation cabinet is a negative pressure test independent of the state of the battery cells and is used to evaluate the vacuum pumping capability of the cabinet itself.

[0050] In the present embodiment, according to the second control condition (such as the air pumping duration is 10 seconds, when reaching 10 seconds, the actual negative pressure value is greater than-50kPa), the actual negative pressure value and time data can be collected and recorded by the negative pressure meter of the formation cabinet, and it is judged whether the vacuum pumping capacity of the formation cabinet meets the second control condition (i.e. when reaching 10 seconds, the actual negative pressure value is greater than-50kPa). If the actual air pumping test data (i.e. the air pumping duration, the actual negative pressure value) meets the second control condition, it shows that the vacuum pumping capacity of the formation cabinet reaches the standard when there is no battery core, which provides a good environmental basis for the battery core formation test.

[0051] Step S104, when the actual empty pumping test data meets the second control condition, the battery cell is placed in a formation cabinet for formation test to obtain actual formation test data, and it is determined whether the actual formation test data meets the third control condition.

[0052] Optionally, when the actual air pumping test data meets the second control condition, the battery cell is placed in a forming cabinet for a forming test, and the battery cell forming test is a negative pressure control test performed by actually placing the battery cell in a forming cabinet.

[0053] In this embodiment, according to the preset third control condition (such as the formation time is 90 seconds, within 90 seconds, the actual negative pressure value must reach -80kPa, and there may be a deviation of ±5kPa), the actual negative pressure value and time data can be collected and recorded through the negative pressure meter of the formation cabinet to evaluate whether the negative pressure condition of the battery cell during the formation process meets the third control condition (that is, within 90 seconds, the actual negative pressure value must reach -80±5kPa).

[0054] Step S105, when the actual formation test data meets the third control condition, completing the control of the black spots on the lithium battery interface.

[0055] In this embodiment, when the actual formation test data (i.e., formation time, actual negative pressure value) meets the third control condition, it indicates that the negative pressure of the battery cell is controlled during the formation process, which helps to avoid the formation of black spots and improve battery performance.

[0056] In summary, the negative pressure in the formation blockage detection tooling, the formation cabinet vacuum pumping and the battery cell formation process are measured respectively, and the first control condition, the second control condition and the third control condition are respectively used to ensure that the negative pressure value and time in each stage meet the corresponding control conditions, thereby effectively controlling the formation of black spots on the lithium battery interface and improving the battery cycle performance and quality standards. The entire process does not require additional equipment or frequent manual adjustments, realizing automated and standardized negative pressure control, improving production efficiency and battery consistency, and thus solving the technical problem of black spots generated on the battery cell interface due to improper negative pressure control in related technologies.

[0057] The formation blockage measuring tool at least includes: a negative pressure meter. In order to accurately determine the first control condition, in the control method of black spots on the lithium battery interface provided in the first embodiment of the present application, for multiple formation cabinets, a negative pressure meter is used to collect historical negative pressure value data according to a first preset time interval, and based on all the collected historical negative pressure value data, multiple first negative pressure curves are constructed, wherein the horizontal axis of the first negative pressure curve is a discrete collection time composed of the collection moments of the multiple historical negative pressure value data, and the vertical axis of the first negative pressure curve is the historical negative pressure value data corresponding to each collection moment; based on each first negative pressure curve, it is determined whether the difference between the historical negative pressure value data corresponding to each two adjacent collection moments is less than a preset difference threshold; when the difference between the historical negative pressure value data corresponding to two adjacent collection moments is less than the preset difference threshold, the duration corresponding to the latter of the two adjacent collection moments is determined as the preset blockage measuring duration; based on each historical negative pressure value data and the preset blockage measuring duration, the first control condition is determined.

[0058] Optionally, for multiple forming cabinets, a negative pressure gauge on a forming blockage measuring tool can be used to continuously collect historical negative pressure value data at a first preset time interval (such as every 10 seconds). These data will be used for subsequent analysis to determine the negative pressure stability of the forming cabinet within a specific time window.

[0059] In this embodiment, a first negative pressure curve can be constructed based on all the collected historical negative pressure value data, wherein the horizontal axis is the discrete collection time composed of the collection moments of multiple historical negative pressure value data, and the vertical axis is the historical negative pressure value data corresponding to each collection moment. The first negative pressure curve can visualize the negative pressure change trend of each formation cabinet during the blockage measurement stage, thereby providing a basis for the next step of analysis.

[0060] In this embodiment, the difference between the historical negative pressure value data corresponding to each two adjacent collection moments (i.e., the two collection points before and after in the time series) is calculated, and it is determined whether these differences are less than a preset difference threshold (a set standard, such as 0, can measure whether the change of the negative pressure value between adjacent collection moments tends to be stable). By comparing the difference with the preset difference threshold, the stability of the negative pressure control of the forming cabinet within the first preset time interval can be evaluated. In this embodiment, when the difference between the historical negative pressure value data corresponding to two adjacent collection moments is less than the preset difference threshold, the duration corresponding to the latter collection moment of the two adjacent collection moments can be determined as the preset blockage measurement duration (such as 1 minute), and the first control condition can be determined according to each historical negative pressure value data and the preset blockage measurement duration.

[0061] In order to improve the accuracy of determining the first control condition, in the control method for black spots on the lithium battery interface provided in Example 1 of the present application, the mean of multiple historical negative pressure value data is calculated to obtain the mean of the historical negative pressure value data, and based on the mean, the standard deviation of the historical negative pressure value data is calculated to obtain the standard deviation of the historical negative pressure value data; the standard deviation of the historical negative pressure value data is multiplied by a preset multiple to obtain a preset standard deviation; the mean and the preset standard deviation are added to obtain a preset standard negative pressure value; and the condition that the actual measured negative pressure value at a preset blockage measurement time is greater than the preset standard negative pressure value is determined as the first control condition.

[0062] Optionally, by performing mean calculation on multiple historical negative pressure value data obtained from multiple first negative pressure curves, the mean of the historical negative pressure value data can be obtained. Based on the mean, the standard deviation of the historical negative pressure value data can be calculated, and the standard deviation can measure the degree of fluctuation of the negative pressure value data.

[0063] In this embodiment, the standard deviation of the historical negative pressure value data is multiplied by a preset multiple (such as 3) to obtain the preset standard deviation (i.e., the pre-set standard deviation), and the preset standard negative pressure value (such as -70kpa) is obtained by adding the mean to the preset standard deviation. The condition that the actual measured negative pressure value at the preset blockage measurement time is greater than the preset standard negative pressure value is determined as the first control condition.

[0064] In order to accurately determine the second control condition, in the control method for black spots on the lithium battery interface provided in Example 1 of the present application, historical air pumping test data is collected, wherein the historical air pumping test data at least includes: historical air pumping negative pressure values, preset air pumping time, and the historical air pumping negative pressure values ​​refer to the negative pressure values ​​measured when the air pumping time reaches the preset air pumping time; the condition that the actual measured negative pressure value is less than the historical air pumping negative pressure value is determined as the second control condition.

[0065] Optionally, the historical air pumping test data includes at least a historical air pumping negative pressure value (such as -50 kPa) and a preset air pumping time (such as 10 seconds). The historical air pumping negative pressure value refers to the negative pressure value actually measured inside the forming cabinet when the air pumping time reaches the preset air pumping time during the air pumping test of the forming cabinet.

[0066] In the present embodiment, when the actual vacuum test is performed on the formation cabinet, the actual measured negative pressure value measured can be monitored and recorded. If the actual measured negative pressure value of the formation cabinet is less than the historical vacuum negative pressure value when the preset vacuum duration is reached, the condition can be determined as the second control condition. The setting of the second control condition is intended to prompt the operator or system that there may be problems with the vacuum performance of the formation cabinet, and measures can be taken to adjust or maintain to ensure the stability and consistency of the negative pressure control.

[0067] The formation cabinet at least includes: a negative pressure meter. In order to accurately determine the third control condition, in the control method for black spots on the lithium battery interface provided in the first embodiment of the present application, for multiple formation cabinets, a standard negative pressure value for each formation cabinet to form a battery cell is determined; according to a first preset time interval, historical negative pressure value data is collected using the negative pressure meter, and a second negative pressure curve is constructed based on all the collected historical negative pressure value data, wherein the abscissa of the second negative pressure curve is a discrete collection time composed of collection moments of multiple historical negative pressure value data, and the ordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each collection moment; based on the second negative pressure curve, the time required for the historical negative pressure value data to reach the standard negative pressure value is judged, and the time is determined as the standard formation time; based on the standard negative pressure value and the standard formation time, the third control condition is determined.

[0068] Optionally, for each forming cabinet involved in the forming process, a standard negative pressure value for battery cell forming can be determined (such as -80kpa, which may fluctuate by ±5kpa). The standard negative pressure value is the negative pressure level that the forming cabinet needs to reach and maintain during the forming process. By setting the standard negative pressure value, the consistency and controllability of the forming environment can be ensured, providing the best forming conditions for the battery cells and avoiding interface problems caused by insufficient or fluctuating negative pressure.

[0069] In the present embodiment, the negative pressure meter on the formation cabinet can be used to collect historical negative pressure value data at a first preset time interval (for example, every 10 seconds), and based on all the collected historical negative pressure value data, a second negative pressure curve can be constructed, wherein the abscissa represents the discrete acquisition time constituted by the data acquisition moment, and the ordinate represents the specific historical negative pressure value data corresponding to each acquisition moment. The second negative pressure curve intuitively reflects the changing trend of the negative pressure value of the formation cabinet in the formation stage, and provides a visualization tool for subsequent analysis.

[0070] In this embodiment, by analyzing the second negative pressure curve, the time required for the historical negative pressure value data to reach the standard negative pressure value can be determined, and this time is determined as the standard formation time (that is, the time required for the formation cabinet to quickly and stably reach the standard negative pressure value). This can ensure that the formation cabinet provides a stable and compliant negative pressure environment within the specified time, thereby ensuring the quality and efficiency of the battery cell formation. The third control condition can be determined based on the standard negative pressure value of the formation cabinet and the standard formation time.

[0071] In order to improve the accuracy of determining the third control condition, in the control method for black spots on the lithium battery interface provided in Example 1 of the present application, a mean calculation is performed on multiple standard formation time lengths to obtain the mean of the standard formation time length, and based on the mean, the standard deviation of the standard formation time length is calculated to obtain the standard deviation of the standard formation time length; the standard deviation is multiplied by a preset multiple to obtain a preset time standard deviation; the mean and the preset time standard deviation are added to obtain the preset standard formation time; and the condition that the actually measured negative pressure value reaches the standard negative pressure value within the preset standard formation time length is determined as the third control condition.

[0072] Optionally, in order to identify the average level of time required for the forming cabinet to reach the expected negative pressure state (i.e., the standard negative pressure value), the standard forming time of multiple forming cabinets when reaching the standard negative pressure value can be averaged to obtain the average of the standard forming time, thereby providing a reference benchmark for setting subsequent control conditions.

[0073] In this embodiment, the standard deviation of the standard formation time can be calculated based on the mean value of the standard formation time to obtain the standard deviation of the standard formation time. The standard deviation of the standard formation time is multiplied by a preset multiple (for example, 3) to obtain a preset time standard deviation. The mean value of the standard formation time is added to the preset time standard deviation to obtain a preset standard formation time (such as 90 seconds). The condition that the actual measured negative pressure value reaches the standard negative pressure value within the preset standard formation time is determined as the third control condition.

[0074] In order to accurately determine the black spot level, in the control method for black spots on the lithium battery interface provided in Example 1 of the present application, the black spot level is determined based on preset control conditions, wherein the black spot level includes at least: a first level, a second level, and a third level; when the first control condition, the second control condition, and the third control condition are met at the same time, the black spot level is determined to be the first level; when at least one of the first control condition, the second control condition, and the third control condition is met, the black spot level is determined to be the second level; when the first control condition, the second control condition, and the third control condition are not met at the same time, the black spot level is determined to be the third level.

[0075] Optionally, the black spot area ratio = the black spot area after the negative electrode (anode) electrode sheet of each fully charged battery cell is unfolded / the total area of ​​the negative electrode (anode) electrode sheet*100%.

[0076] In this embodiment, the black spot area of ​​the first level accounts for less than 0.1%, the black spot area of ​​the second level accounts for more than 0.1% and less than 0.3%, and the black spot area of ​​the third level accounts for more than 0.3%. The three control conditions correspond to the negative pressure monitoring and control requirements of the formation cabinet at different stages. M1 is the negative pressure specification and compliance requirement of the plugging tooling stage, M2 is the negative pressure specification and compliance requirement of the air pumping stage, and M3 is the negative pressure specification and compliance requirement of the pressing stage.

[0077] In this embodiment, if the formation cabinet meets the preset negative pressure specifications and compliance requirements in the blockage detection tooling stage, the air pumping stage and the pressing stage (that is, the first control condition M1, the second control condition M2 and the third control condition M3 are met at the same time), the black spot level can be determined as the first level (that is, the black spot area accounts for less than 0.1%), indicating that the negative pressure control of the formation process is in the best state, the interface quality of the battery cell is optimal, and the black spot problem is minimal.

[0078] In this embodiment, if the formation cabinet meets at least one corresponding control condition in the above three stages, but does not meet all the conditions at the same time, the black spot level can be determined as the second level (that is, the black spot area accounts for more than 0.1% and less than 0.3%), indicating that there are certain defects or fluctuations in the negative pressure control during the formation process, the interface quality of the battery cell may be affected to a certain extent, and the black spot problem exists but is relatively small.

[0079] In this embodiment, if the formation cabinet does not meet the corresponding control conditions in the above three stages, the black spot level can be determined as the third level (that is, the black spot area accounts for more than 0.3%), indicating that the negative pressure control in the formation process is seriously insufficient or fails, the interface quality of the battery cell is significantly reduced, the black spot problem is serious, and immediate measures need to be taken for adjustment and optimization.

[0080] In order to accurately identify the abnormality of the formation cabinet, in the control method of black spots on the lithium battery interface provided in the first embodiment of the present application, when the actual simulation test data does not meet the first control condition, the abnormality of the formation cabinet is displayed in the preset system acquisition software program module, and the formation cabinet is disabled; or, when the actual vacuum test data does not meet the second control condition, the abnormality of the formation cabinet is displayed in the preset system acquisition software program module, and the formation cabinet is disabled; or, when the actual formation test data does not meet the third control condition, the abnormality of the formation cabinet is displayed in the preset system acquisition software program module, and the formation cabinet is disabled.

[0081] Optionally, in order to ensure that the formation cabinet can operate according to the preset negative pressure specifications, thereby providing a stable and suitable formation environment for the battery cells, the negative pressure state of the formation cabinet at different stages can be monitored in real time, including the blockage detection tooling stage, the air pumping stage and the pressing stage (i.e., the formation stage).

[0082] In this embodiment, if the negative pressure (such as P1) value in the actual simulated test data does not reach the first control condition (i.e., P1 <-70 kPa) when the formation cabinet is tested using a blockage detection fixture, the preset system acquisition software program module (such as the MES system acquisition software program module) will immediately display that there is an abnormality in the formation cabinet and can disable the formation cabinet. The purpose of this response mechanism is to prevent the formation cabinet with too low negative pressure from continuing to operate, so as to avoid adverse effects on the battery cell interface, such as the formation of black spots.

[0083] In this embodiment, if the negative pressure value (such as p2) in the actual air pumping test data does not reach the second control condition (i.e., p2>-50kPa) within the preset air pumping time (such as 10 seconds) during the air pumping test of the formation cabinet, the preset system acquisition software program module will also display that there is an abnormality in the formation cabinet and can disable the formation cabinet. This mechanism ensures that the formation cabinet can quickly reach and maintain the ideal negative pressure level during the air pumping stage, thereby preventing the formation effect and interface quality of the battery cell from being affected due to the slow speed of negative pressure establishment.

[0084] In this embodiment, when the formation cabinet contacts the battery cell and starts the formation process, if the negative pressure value in the actual formation test data does not reach the third control condition within the preset standard formation time (such as 90 seconds) (that is, the negative pressure value of -80±5kPa is not reached within 90 seconds), the preset system acquisition software program module will trigger an alarm, indicating that there is an abnormality in the formation cabinet, and the formation cabinet can be disabled, thereby ensuring the stability and timeliness of the negative pressure during the formation process, and avoiding battery cell quality problems caused by negative pressure fluctuations or insufficient duration.

[0085] Figure 2 Schematic diagram of the working principle of an optional negative pressure forming system according to an embodiment of the present invention, such as Figure 2As shown, the formation negative pressure system includes: a negative pressure source, a proportional valve, a negative pressure gauge, a gas-liquid separator, a drain valve, a vacuum breaker valve, a filter, a negative pressure cup, a negative pressure nozzle, a battery cell, and a dry gas source. When the formation process begins, the negative pressure source in the system starts to work and generates negative pressure. The proportional valve can adjust the gas flow between the negative pressure source and the system according to the set negative pressure value. The formation cabinet is equipped with a negative pressure gauge, which can monitor the negative pressure value in real time and feed the data back to the preset system acquisition software program module. The negative pressure nozzle is connected to the exhaust port of the battery cell. When the battery cell generates gas and mist electrolyte during the formation process, the gas and mist electrolyte will enter the negative pressure cup through the negative pressure nozzle. The gas-liquid separation tower inside the negative pressure cup can realize the filtering and reflux function of most liquids. , and the gas-liquid mixture that has not been completely separated further enters the gas-liquid separator, which can achieve more thorough gas-liquid separation. The filter element in the filter cup can also filter the particles in the gas. When the formation charging is completed, the vacuum breaking valve is opened, and the dry gas in the dry gas source (such as nitrogen or argon) is introduced into the system. After the dry gas source passes through the filter to remove impurities, the negative pressure state inside the battery cell or the sealed cavity can be gradually restored to normal pressure. After that, the liquid in the gas-liquid separator can be discharged from the system through the drain valve to keep the system clean and operating normally.

[0086] In an optional embodiment, the following may be used: Figure 2 The working principle of the formation negative pressure system shown in the figure implements the control method of black spots on the interface of lithium batteries.

[0087] In an embodiment of the present invention, historical negative pressure data is monitored by using a formation blockage measuring tool and a negative pressure gauge of a formation cabinet, and preset control conditions (such as a first control condition, a second control condition, and a third control condition) are determined according to the historical data and the collected time data. When the actual test negative pressure values ​​all meet the three control conditions, the black spot level is in the optimal state (i.e., the first level). When the actual test negative pressure value meets at least one of the three control conditions, but not all of them, the black spot level is determined to be the second level. When the three control conditions are not met at the same time, the black spot level is determined to be the third level. For a formation cabinet that does not meet the control conditions, the system can display an abnormality and disable the formation cabinet to avoid producing unqualified batteries. The entire process is closed-loop and automatic, which effectively controls the generation of black spots and improves battery quality and production efficiency.

[0088] The following is a detailed description in conjunction with another embodiment.

[0089] Embodiment 2

[0090] A control device for black spots on the interface of a lithium battery provided in this embodiment includes a plurality of implementation units, each of which corresponds to each implementation step in the above-mentioned first embodiment.

[0091] Figure 3is a schematic diagram of an optional control device for black spots on the lithium battery interface according to an embodiment of the present invention, such as Figure 3 As shown, the control device for black spots on the lithium battery interface may include: a first determining unit 30 , a first judging unit 31 , a second judging unit 32 , a third judging unit 33 , and a first completing unit 34 .

[0092] The first determining unit 30 is used to determine a preset control condition, wherein the preset control condition is used to control the battery cell of the lithium battery to not form black spots during the formation test, and the preset control condition at least includes: a first control condition, a second control condition, and a third control condition;

[0093] The first judgment unit 31 is used to simulate the battery cell by using the formation plugging detection tool, and put the formation plugging detection tool into the formation cabinet to perform a simulation test, obtain actual simulation test data, and judge whether the actual simulation test data meets the first control condition;

[0094] The second judgment unit 32 is used to perform an empty pumping test on the formation cabinet to obtain actual empty pumping test data and judge whether the actual empty pumping test data meets the second control condition when the actual simulation test data meets the first control condition;

[0095] The third judgment unit 33 is used to place the battery cell into the formation cabinet for formation test when the actual empty pumping test data meets the second control condition, obtain the actual formation test data, and judge whether the actual formation test data meets the third control condition;

[0096] The first completing unit 34 is used to complete the control of the black spots on the interface of the lithium battery when the actual formation test data meets the third control condition.

[0097] The control device for the black spots on the interface of the lithium battery can determine the preset control conditions through the first determination unit 30, use the formation plugging detection tooling to simulate the battery cell through the first judgment unit 31, and put the formation plugging detection tooling into the formation cabinet for simulation testing to obtain actual simulation test data, and judge whether the actual simulation test data meets the first control condition; through the second judgment unit 32, when the actual simulation test data meets the first control condition, perform an empty pumping test on the formation cabinet to obtain actual empty pumping test data, and judge whether the actual empty pumping test data meets the second control condition; through the third judgment unit 33, when the actual empty pumping test data meets the second control condition, put the battery cell into the formation cabinet for formation testing to obtain actual formation test data, and judge whether the actual formation test data meets the third control condition; through the first completion unit 34, when the actual formation test data meets the third control condition, complete the control of the black spots on the interface of the lithium battery.

[0098] Optionally, the formation blockage detection tooling includes at least: a negative pressure meter, and the first determination unit includes: a first construction module, which is used to collect historical negative pressure value data for multiple formation cabinets using a negative pressure meter according to a first preset time interval, and construct multiple first negative pressure curves based on all the collected historical negative pressure value data, wherein the horizontal axis of the first negative pressure curve is a discrete collection time composed of collection moments of multiple historical negative pressure value data, and the vertical axis of the first negative pressure curve is the historical negative pressure value data corresponding to each collection moment; a first judgment module, which is used to judge whether the difference between the historical negative pressure value data corresponding to each two adjacent collection moments is less than a preset difference threshold based on each first negative pressure curve; a first determination module, which is used to determine the duration corresponding to the latter of the two adjacent collection moments as the preset blockage detection duration when the difference between the historical negative pressure value data corresponding to the two adjacent collection moments is less than the preset difference threshold; a second determination module, which is used to determine the first control condition based on each historical negative pressure value data and the preset blockage detection duration.

[0099] Optionally, the second determination module includes: a first calculation submodule, used to perform mean calculation on multiple historical negative pressure value data to obtain the mean of the historical negative pressure value data, and based on the mean, perform standard deviation calculation on the historical negative pressure value data to obtain the standard deviation of the historical negative pressure value data; a second calculation submodule, used to multiply the standard deviation of the historical negative pressure value data by a preset multiple to obtain a preset standard deviation; a third calculation submodule, used to add the mean to the preset standard deviation to obtain a preset standard negative pressure value; the first determination submodule, used to determine the condition that the actual measured negative pressure value at a preset blockage measurement time is greater than the preset standard negative pressure value as the first control condition.

[0100] Optionally, the first determination unit includes: a first acquisition module, used to collect historical air pumping test data, wherein the historical air pumping test data at least includes: a historical air pumping negative pressure value, a preset air pumping time, and the historical air pumping negative pressure value refers to the negative pressure value measured when the air pumping time reaches the preset air pumping time; a third determination module, used to determine the condition that the actual measured negative pressure value is less than the historical air pumping negative pressure value as the second control condition.

[0101] Optionally, the formation cabinet at least includes: a negative pressure meter, and the first determination unit includes: a fourth determination module, which is used to determine the standard negative pressure value of each formation cabinet for battery cell formation for multiple formation cabinets; a second construction module, which is used to collect historical negative pressure value data using the negative pressure meter according to a first preset time interval, and construct a second negative pressure curve based on all the collected historical negative pressure value data, wherein the abscissa of the second negative pressure curve is a discrete collection time composed of collection moments of multiple historical negative pressure value data, and the ordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each collection moment; a second judgment module, which is used to judge the time required for the historical negative pressure value data to reach the standard negative pressure value based on the second negative pressure curve, and determine the time as the standard formation time; a fifth determination module, which is used to determine the third control condition based on the standard negative pressure value and the standard formation time.

[0102] Optionally, the fifth determination module includes: a fourth calculation submodule, which is used to calculate the mean of multiple standard formation time lengths to obtain the mean of the standard formation time lengths, and based on the mean, calculate the standard deviation of the standard formation time length to obtain the standard deviation of the standard formation time length; a fifth calculation submodule, which is used to multiply the standard deviation by a preset multiple to obtain a preset time standard deviation; a sixth calculation submodule, which is used to add the mean to the preset time standard deviation to obtain a preset standard formation time length; a second determination submodule, which is used to determine the condition that the actual measured negative pressure value reaches the standard negative pressure value within the preset standard formation time length as the third control condition.

[0103] Optionally, the control device includes: a sixth determination module, used to determine the black spot level based on the preset control conditions after determining the preset control conditions, wherein the black spot level includes at least: a first level, a second level, and a third level; a seventh determination module, used to determine the black spot level as the first level when the first control condition, the second control condition and the third control condition are simultaneously met; an eighth determination module, used to determine the black spot level as the second level when at least one of the first control condition, the second control condition and the third control condition is met; and a ninth determination module, used to determine the black spot level as the third level when the first control condition, the second control condition and the third control condition are not simultaneously met.

[0104] Optionally, the control device includes: a first processing module, used to display the existence of an abnormality in the forming cabinet in the preset system acquisition software program module and disable the forming cabinet when the actual simulation test data does not meet the first control condition; a second processing module, used to display the existence of an abnormality in the forming cabinet in the preset system acquisition software program module and disable the forming cabinet when the actual vacuum test data does not meet the second control condition; a third processing module, used to display the existence of an abnormality in the forming cabinet in the preset system acquisition software program module and disable the forming cabinet when the actual formation test data does not meet the third control condition.

[0105] The control device for black spots on the interface of the lithium battery may further include a processor and a memory. The first determination unit 30, the first judgment unit 31, the second judgment unit 32, the third judgment unit 33, the first completion unit 34, etc. are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

[0106] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the control of the black spots on the lithium battery interface can be completed based on the preset control conditions by adjusting the kernel parameters.

[0107] The above-mentioned memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one storage chip.

[0108] According to another aspect of an embodiment of the present invention, a computer program product is also provided, including a non-volatile computer-readable storage medium, the non-volatile computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, any of the above-mentioned methods for controlling black spots on the lithium battery interface is implemented.

[0109] When the computer program product is executed on a data processing device, it is suitable for executing a program that is initialized with the following method steps: determining preset control conditions, using a formation plugging detection tool to simulate a battery cell, and placing the formation plugging detection tool into a formation cabinet for simulation testing to obtain actual simulation test data, judging whether the actual simulation test data meets a first control condition, and when the actual simulation test data meets the first control condition, performing an empty pumping test on the formation cabinet to obtain actual empty pumping test data, and judging whether the actual empty pumping test data meets a second control condition, and when the actual empty pumping test data meets the second control condition, placing the battery cell into a formation cabinet for formation testing to obtain actual formation test data, and judging whether the actual formation test data meets a third control condition, and when the actual formation test data meets the third control condition, completing the control of black spots on the lithium battery interface.

[0110] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors implement the above-mentioned method for controlling black spots on the lithium battery interface.

[0111] Figure 4 1 is a hardware structure block diagram of an electronic device (or mobile device) for a method for controlling black spots on a lithium battery interface according to an embodiment of the present invention. Figure 4 As shown, the electronic device may include one or more processors (e.g., Figure 4 The processor 402a, processor 402b, ..., processor 402n, etc., which may include but are not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 404 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the I / O interface), a network interface, a keyboard, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 4 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 4 More or fewer components as shown, or with Figure 4 Different configurations are shown.

[0112] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0113] The embodiments or examples of the present disclosure are not exhaustive, but are only illustrative of some embodiments or examples, and are not intended to be specific limitations on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment or example can be implemented as an independent example, and the steps can be combined arbitrarily. For example, the scheme after removing some steps in a certain embodiment or example can also be implemented as an independent example, and the order of the steps in a certain embodiment or example can be arbitrarily exchanged. In addition, the optional methods or optional examples in a certain embodiment or example can be combined arbitrarily; in addition, the various embodiments or examples can be combined arbitrarily, for example, some or all steps of different embodiments or examples can be combined arbitrarily, and a certain embodiment or example can be combined arbitrarily with the optional methods or optional examples of other embodiments or examples.

[0114] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0115] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0116] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0117] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0118] If the integrated unit is implemented in the form of 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, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0119] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling black spots on the interface of a lithium battery, characterized in that: include: Determine a preset control condition, wherein the preset control condition is used to control the battery cell of the lithium battery to not form black spots during the formation test, and the preset control condition at least includes: a first control condition, a second control condition, and a third control condition; Using a formation plugging detection tool to simulate a battery cell, and placing the formation plugging detection tool into a formation cabinet to perform a simulation test, obtaining actual simulation test data, and determining whether the actual simulation test data meets the first control condition; When the actual simulation test data satisfies the first control condition, performing an empty pumping test on the formation cabinet to obtain actual empty pumping test data, and determining whether the actual empty pumping test data satisfies the second control condition; When the actual empty pumping test data satisfies the second control condition, placing the battery cell into the formation cabinet for formation test to obtain actual formation test data, and determining whether the actual formation test data satisfies the third control condition; When the actual formation test data satisfies the third control condition, the control of the black spots on the lithium battery interface is completed.

2. The method for controlling black spots on the lithium battery interface according to claim 1, characterized in that: The chemical formation plugging detection tool at least includes: a negative pressure gauge, and the step of determining the first control condition includes: For the plurality of formation cabinets, the negative pressure meter is used to collect historical negative pressure value data according to a first preset time interval, and based on all the collected historical negative pressure value data, a plurality of first negative pressure curves are constructed, wherein the abscissa of the first negative pressure curve is a discrete collection time constituted by the collection moments of the plurality of historical negative pressure value data, and the ordinate of the first negative pressure curve is the historical negative pressure value data corresponding to each collection moment; Based on each of the first negative pressure curves, determining whether a difference between the historical negative pressure value data corresponding to each two adjacent collection moments is less than a preset difference threshold; When the difference between the historical negative pressure value data corresponding to two adjacent collection moments is less than the preset difference threshold, the duration corresponding to the latter of the two adjacent collection moments is determined as the preset congestion measurement duration; The first control condition is determined based on each of the historical negative pressure value data and the preset blockage detection time.

3. The method for controlling black spots on the lithium battery interface according to claim 2, characterized in that: The step of determining the first control condition based on each of the historical negative pressure value data and the preset blockage detection time comprises: Performing mean calculation on a plurality of the historical negative pressure value data to obtain the mean of the historical negative pressure value data, and performing standard deviation calculation on the historical negative pressure value data based on the mean to obtain the standard deviation of the historical negative pressure value data; Multiplying the standard deviation of the historical negative pressure value data by a preset multiple to obtain a preset standard deviation; Adding the mean value to the preset standard deviation to obtain a preset standard negative pressure value; The condition that the actual measured negative pressure value during the preset blockage detection time is greater than the preset standard negative pressure value is determined as the first control condition.

4. The method for controlling black spots on the lithium battery interface according to claim 1, characterized in that: The step of determining the second control condition comprises: Collect historical air pumping test data, wherein the historical air pumping test data at least includes: historical air pumping negative pressure value and preset air pumping time, wherein the historical air pumping negative pressure value refers to the negative pressure value measured when the air pumping time reaches the preset air pumping time; The condition that the actually measured negative pressure value is less than the historical vacuum negative pressure value is determined as the second control condition.

5. The method for controlling black spots on the lithium battery interface according to claim 1, characterized in that: The formation cabinet at least includes: a negative pressure gauge, and the step of determining the third control condition includes: For the plurality of forming cabinets, determining a standard negative pressure value for each forming cabinet for cell forming; According to a first preset time interval, the negative pressure table is used to collect historical negative pressure value data, and a second negative pressure curve is constructed based on all the collected historical negative pressure value data, wherein the abscissa of the second negative pressure curve is a discrete collection time composed of collection moments of multiple historical negative pressure value data, and the ordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each collection moment; Based on the second negative pressure curve, determining the time required for the historical negative pressure value data to reach the standard negative pressure value, and determining the time as the standardization time; The third control condition is determined based on the standard negative pressure value and the standard formation time.

6. The method for controlling black spots on the lithium battery interface according to claim 5, characterized in that: The step of determining the third control condition based on the standard negative pressure value and the standard formation time comprises: Performing mean calculation on a plurality of the standard formation time lengths to obtain a mean of the standard formation time lengths, and performing standard deviation calculation on the standard formation time lengths based on the mean to obtain a standard deviation of the standard formation time lengths; Multiplying the standard deviation by a preset multiple to obtain a preset time standard deviation; Adding the mean value to the preset time standard deviation to obtain a preset conversion standard time length; The condition that the actually measured negative pressure value reaches the standard negative pressure value within the preset standard time period is determined as the third control condition.

7. The method for controlling black spots on the lithium battery interface according to claim 1, characterized in that: After determining the preset control conditions, it also includes: Based on the preset control conditions, determining a black spot level, wherein the black spot level includes at least: a first level, a second level, and a third level; When the first control condition, the second control condition and the third control condition are simultaneously satisfied, determining the black spot level as the first level; When at least one of the first control condition, the second control condition and the third control condition is satisfied, determining the black spot level as the second level; When the first control condition, the second control condition, and the third control condition are not satisfied at the same time, the black spot level is determined to be the third level.

8. The method for controlling black spots on the lithium battery interface according to claim 1, characterized in that: The method for controlling black spots on the lithium battery interface also includes: In the case where the actual simulation test data does not satisfy the first control condition, displaying that the formation cabinet is abnormal in the preset system acquisition software program module and disabling the formation cabinet; or, In the case where the actual vacuum test data does not satisfy the second control condition, the formation cabinet is displayed as abnormal in the preset system acquisition software program module, and the formation cabinet is disabled; or In the case that the actual formation test data does not satisfy the third control condition, it is displayed in the preset system acquisition software program module that the formation cabinet is abnormal, and the formation cabinet is disabled.

9. A control device for black spots on the interface of a lithium battery, characterized in that: include: A first determining unit, used to determine a preset control condition, wherein the preset control condition is used to control the battery cell of the lithium battery to not form black spots during the formation test, and the preset control condition at least includes: a first control condition, a second control condition, and a third control condition; A first judgment unit is used to simulate a battery cell by using a formation plugging detection tool, and put the formation plugging detection tool into a formation cabinet to perform a simulation test, obtain actual simulation test data, and judge whether the actual simulation test data meets the first control condition; A second judgment unit is used to perform an empty pumping test on the formation cabinet to obtain actual empty pumping test data when the actual simulation test data meets the first control condition, and judge whether the actual empty pumping test data meets the second control condition; A third judgment unit is used for placing the battery cell into the formation cabinet for formation test to obtain actual formation test data when the actual empty pumping test data meets the second control condition, and judging whether the actual formation test data meets the third control condition; The first completing unit is used to complete the control of the black spots on the lithium battery interface when the actual formation test data meets the third control condition.

10. A computer program product, characterized in that It comprises a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for controlling black spots on the interface of a lithium battery according to any one of claims 1 to 8 is implemented.

11. An electronic device, characterized in that: It comprises one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method for controlling black spots on the interface of a lithium battery as described in any one of claims 1 to 8.

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