Method for controlling black spot of lithium battery interface and device thereof, electronic equipment

Abstract

The application discloses a kind of control method and device of lithium battery interface black spot and electronic equipment, it is related to lithium battery technical field, wherein, the control method includes: determining preset control condition, using formation test blocking tooling simulation cell, formation test blocking tooling is put into formation cabinet and is simulated test, obtains actual simulation test data, in the case where judging actual simulation test data meets first control condition, to formation cabinet is carried out empty pumping test, obtains actual empty pumping test data, in the case where judging actual empty pumping test data meets second control condition, cell is put into formation cabinet and is carried out formation test, obtains actual formation test data, and whether actual formation test data meets third control condition is judged, in the case where actual formation test data meets third control condition, control of lithium battery interface black spot is completed.The application solves the technical problem that battery cell interface generates black spot due to improper negative pressure control in the related art.

Description

TECHNICAL FIELD

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

[0002] With the application of LFP (Lithium Iron Phosphate) lithium batteries in power and energy storage, the interface problem of the battery cell (such as the improvement and identification of the interface) has also emerged. In the first charge-discharge activation process of the lithium battery, if the lithium intercalation reaction on the surface of the negative electrode sheet is abnormal, black spots will be formed on the surface of the graphite due to incomplete lithium intercalation, and under the condition of low SOC (State of Charge), the color of the negative electrode surface does not show a significant golden yellow color, which makes the visual detection of the black spots complex and difficult to effectively identify.

[0003] Compared with the SEI (solid electrolyte interface) film of the normal area, the SEI film element content of the black spot area is segregated, the formation composition is abnormal, and the graphite particles float on the surface of the electrode sheet, which is easy to show obvious morphological abnormalities, loose and disordered structure, and significant increase in the gap. In the depth range of 0-200nm, the element content of Li (lithium), 0 (oxygen) and F (fluorine) in the black spot area is higher than that in the normal area, which causes it to present a sunken state, therefore, the key feature of the formation of the black spot lies in the excessive thickening of the SEI film and the embedding of the lithium-containing compound.

[0004] The current analysis scheme for the interface black spot of lithium battery mainly includes: (1) visual detection method, mainly for risk battery full charge disassembly, manual identification of interface defects, can directly observe the position, shape, size and distribution of black spots, can quickly lock the obvious surface black spots, timely analyze the lithium battery in the production process, find out the problem and adjust the production process. But it is difficult to detect internal or microscopic black spots, the identification accuracy of small and color difference is not obvious, it is easy to be affected by light, angle and other environmental factors, and the battery surface reflection, stains and other factors, the professional skill requirement is high, which is easy to lead to misjudgment or omission. (2) scanning electron microscope analysis method, mainly used for black spot area morphology analysis, can provide high resolution micro morphology image, clearly show the microstructure of black spot area, can analyze the element composition and distribution of black spot, help to determine the cause of black spot, has high detection sensitivity and accuracy for small and hidden black spots. But the equipment is expensive, the detection cost is high, the operation is complex, and the professional technical personnel are needed to operate, the detection speed is slow, which is not suitable for large-scale and rapid detection, and the sample needs to be pretreated, which may cause certain damage or change to the sample. (3) energy spectrum analysis method, mainly used for black spot area composition analysis, can accurately determine the element types and content of black spot area and surrounding area, provide accurate chemical composition information for black spot cause analysis, can detect trace elements, which is helpful to find out the black spot problem caused by impurities or element abnormality. Combined with scanning electron microscopy and other technologies, the characteristics of black spots can be studied comprehensively and deeply. But the equipment cost is high, the operation is complex, and the detection range is limited, which can only analyze the element information within a certain depth of the sample surface, and it is difficult to accurately detect the element distribution in the deeper internal part, and the detection result is affected by the sample surface flatness, conductivity and other factors. (4) electrochemical test method, which can indirectly reflect the influence of black spot on battery performance by measuring the voltage, current, internal resistance and other electrochemical parameters of the battery, evaluate whether the black spot leads to internal short circuit, polarization and other problems, can monitor in real time during the charging and discharging process of the battery, understand the dynamic influence law of black spot on the performance of the battery, and provide important basis for the evaluation and solution of black spot problem. But it can't directly observe the morphology and position of black spot, the qualitative analysis ability of black spot is limited, it can only speculate the existence and influence of black spot from the perspective of electrochemical performance change, and the electrochemical test is easily disturbed by many factors, such as test environment temperature, humidity, charge and discharge system and other factors, which need to be strictly controlled to ensure the accuracy of the results.

[0005] In the process of charging the battery cell, the negative electrode surface black spot is one of the interface defects. The interface black spot defect can cause low capacity, voltage anomaly, capacity anomaly, etc. The formation process of the black spot is often accompanied by the generation of lithium precipitation, insufficient lithium intercalation of graphite, loss of active point, and deterioration of dynamic performance, which can cause many hidden dangers for the subsequent battery safety. Therefore, in order to solve the above-mentioned black spot problem, various studies have been carried out, such as increasing the temperature control, negative pressure control, moisture control, etc. The monitoring specifications are adjusted by artificially adjusting the oven temperature, negative pressure, time control, etc. And from the process point of view, the formation current is adjusted, the immersion time is increased, the interface SEI film is optimized, and the black spot problem is improved.

[0006] However, the generation and control of the black spot have not been solved at the root. Different batches of graphite or when the process is greatly adjusted, the black spot problem still occurs, and the black spot is more serious on the interface after formation, so that in the actual production process, the baking temperature and time need to be repeatedly adjusted manually, which seriously depends on the skill level of the production technical personnel, and the consistency of the interface is affected. And although the measures such as increasing the baking time can alleviate the black spot problem, it has an impact on the production capacity of the battery cell.

[0007] At present, no effective solution has been proposed for the above problems. SUMMARY

[0008] The embodiments of the present application provide a control method and device for lithium battery interface black spot and electronic equipment to at least solve the technical problem of generating black spot on the interface of the battery cell caused by improper negative pressure control in the related art.

[0009] According to an aspect of the embodiments of the present application, a control method for lithium battery interface black spot is provided, comprising: determining a preset control condition, wherein the preset control condition is used to control the battery cell of the lithium battery to not form a black spot during formation test, and the preset control condition at least includes: a first control condition, a second control condition, and a third control condition; simulating the battery cell by using a formation test tool, and putting the formation test tool into a formation cabinet for simulation test to obtain actual simulation test data, and judging whether the actual simulation test data meets the first control condition; in the case that 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 the second control condition; in the case that the actual empty pumping test data meets the second control condition, putting the battery cell into the formation cabinet for formation test to obtain actual formation test data, and judging whether the actual formation test data meets the third control condition; and in the case that the actual formation test data meets the third control condition, completing the control of the lithium battery interface black spot.

[0010] Further, the step of determining the first control condition comprises: for each of the plurality of the formation cabinets, collecting historical negative pressure value data according to a first preset time interval, and constructing a first negative pressure curve based on all the collected historical negative pressure value data, wherein the horizontal coordinate of the first negative pressure curve is discrete collection time composed of collection time corresponding to each of the 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 of the collection time; determining whether the difference between the historical negative pressure value data corresponding to each of two adjacent collection times is less than a preset difference threshold based on each of the first negative pressure curves; in the case that the difference between the historical negative pressure value data corresponding to two adjacent collection times is less than the preset difference threshold, determining the time length corresponding to the latter of the two adjacent collection times as a preset clogging detection time length; and determining the first control condition based on each of the historical negative pressure value data and the preset clogging detection time length.

[0011] Further, the step of determining the first control condition based on each of the historical negative pressure value data and the preset clogging detection time length comprises: performing mean value calculation on the plurality of historical negative pressure value data to obtain a mean value of the historical negative pressure value data, and performing standard deviation calculation on the historical negative pressure value data based on the mean value to obtain a 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 and 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 clogging detection time length is greater than the preset standard negative pressure value as the first control condition.

[0012] Further, the step of determining the second control condition comprises: collecting historical emptying test data, wherein the historical emptying test data at least comprises a historical emptying negative pressure value and a preset emptying time length, the historical emptying negative pressure value being a negative pressure value measured when the emptying time length reaches the preset emptying time length; and determining the condition that the actual measured negative pressure value is less than the historical emptying negative pressure value as the second control condition.

[0013] Further, the formation cabinet body at least comprises: a negative pressure table, the step of determining the third control condition comprises: determining a standard negative pressure value of each of the plurality of formation cabinet bodies for cell formation; collecting historical negative pressure value data according to a first preset time interval, and constructing a second negative pressure curve based on all the collected historical negative pressure value data, wherein the horizontal coordinate of the second negative pressure curve is a discrete collection time composed of the collection time of the plurality of historical negative pressure value data, and the vertical coordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each of the collection time; determining a time length required for the historical negative pressure value data to reach the standard negative pressure value based on the second negative pressure curve, and determining the time length as a formation standard time length; and determining the third control condition based on the standard negative pressure value and the formation standard time length.

[0014] Further, the step of determining the third control condition based on the standard negative pressure value and the formation standard time length comprises: performing mean value calculation on the plurality of formation standard time lengths to obtain a mean value of the formation standard time length, and performing standard deviation calculation on the formation standard time length based on the mean value to obtain a standard deviation of the formation standard time length; multiplying the standard deviation by a preset multiple to obtain a preset time standard deviation; adding the mean value and the preset time standard deviation to obtain a preset formation standard time length; and determining a condition that an actual measured negative pressure value reaches the standard negative pressure value within the preset formation standard time length as the third control condition.

[0015] Further, after determining the preset control condition, the method further comprises: determining a black spot level based on the preset control condition, wherein the black spot level at least comprises: a first level, a second level, and a third level; determining the black spot level as the first level when the first control condition, the second control condition, and the third control condition are all satisfied; determining 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 satisfied; and determining the black spot level as the third level when the first control condition, the second control condition, and the third control condition are all not satisfied.

[0016] Further, the method for controlling the black spot of the lithium battery interface further comprises: in the case that the actual simulation test data does not satisfy the first control condition, displaying that the formation cabinet exists an abnormality in the preset system acquisition software program module and disabling the formation cabinet; or, in the case that the actual emptying test data does not satisfy the second control condition, displaying that the formation cabinet exists an abnormality in the preset system acquisition software program module and disabling the formation cabinet; or, in the case that the actual formation test data does not satisfy the third control condition, displaying that the formation cabinet exists an abnormality in the preset system acquisition software program module and disabling the formation cabinet.

[0017] According to another aspect of the embodiments of the present application, a device for controlling the black spot of the lithium battery interface is also provided, comprising: a first determination unit configured to determine a preset control condition, wherein the preset control condition is used to control the black spot of the lithium battery cell during the formation test, and the preset control condition at least comprises: a first control condition, a second control condition and a third control condition; a first judgment unit configured to simulate the cell by using a formation test tool, and put the formation test tool into a formation cabinet for simulation test to obtain actual simulation test data, and judge whether the actual simulation test data satisfies the first control condition; a second judgment unit configured to, in the case that the actual simulation test data satisfies the first control condition, perform an emptying test on the formation cabinet to obtain actual emptying test data, and judge whether the actual emptying test data satisfies the second control condition; a third judgment unit configured to, in the case that the actual emptying test data satisfies the second control condition, put the cell into the formation cabinet for formation test to obtain actual formation test data, and judge whether the actual formation test data satisfies the third control condition; and a first completion unit configured to, in the case that the actual formation test data satisfies the third control condition, complete the control of the black spot of the lithium battery interface.

[0018] Further, the formation blockage detection tool at least comprises a negative pressure gauge, and the first determination unit comprises: a first construction module, configured to, for a plurality of the formation cabinets, collect historical negative pressure value data by using the negative pressure gauge according to a first preset time interval, and construct a plurality of 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 discrete collection time composed of collection time corresponding to a plurality of the 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 of the collection time; a first judgment module, configured to judge whether the difference between the historical negative pressure value data corresponding to each of two adjacent collection times is less than a preset difference threshold based on each of the first negative pressure curves; a first determination module, configured to determine the time length corresponding to the latter of the two adjacent collection times as a preset blockage detection time length in the case that the difference between the historical negative pressure value data corresponding to the two adjacent collection times is less than the preset difference threshold; and a second determination module, configured to determine the first control condition based on each of the historical negative pressure value data and the preset blockage detection time length.

[0019] Further, the second determination module comprises: a first calculation submodule, configured to perform mean value calculation on a plurality of the historical negative pressure value data to obtain the mean value of the historical negative pressure value data, and perform standard deviation calculation on the historical negative pressure value data based on the mean value to obtain the standard deviation of the historical negative pressure value data; a second calculation submodule, configured 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, configured to add the mean value and the preset standard deviation to obtain a preset standard negative pressure value; and a first determination submodule, configured to determine the condition that the actual measured negative pressure value at the preset blockage detection time length is greater than the preset standard negative pressure value as the first control condition.

[0020] Further, the first determination unit comprises: a first collection module, configured to collect historical empty pumping test data, wherein the historical empty pumping test data at least comprises a historical empty pumping negative pressure value and a preset empty pumping time length, the historical empty pumping negative pressure value being a negative pressure value measured when the empty pumping time length reaches the preset empty pumping time length; and a third determination module, configured to determine the condition that the actual measured negative pressure value is less than the historical empty pumping negative pressure value as the second control condition.

[0021] Further, the formation cabinet body at least comprises a negative pressure table, the first determination unit comprises: a fourth determination module, configured to determine, for a plurality of the formation cabinet bodies, a standard negative pressure value of each of the formation cabinet bodies for cell formation; a second construction module, configured to collect historical negative pressure value data by 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 horizontal coordinate of the second negative pressure curve is discrete collection time constituted by collection time of the plurality of historical negative pressure value data, and the vertical coordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each of the collection time; a second judgment module, configured to determine, based on the second negative pressure curve, a time length required for the historical negative pressure value data to reach the standard negative pressure value, and determine the time length as a formation standard time length; and a fifth determination module, configured to determine the third control condition based on the standard negative pressure value and the formation standard time length.

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

[0023] Further, the control device comprises: a sixth determination module, configured to determine a black spot level based on a preset control condition after the preset control condition is determined, wherein the black spot level at least comprises: a first level, a second level, and a third level; a seventh determination module, configured 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 all satisfied; an eighth determination module, configured 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 satisfied; and a ninth determination module, configured 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 all not satisfied.

[0024] Further, the control device comprises a first processing module configured to display that the formation cabinet has an abnormality and disable the formation cabinet in a preset system acquisition software program module if the actual simulation test data does not satisfy a first control condition; a second processing module configured to display that the formation cabinet has an abnormality and disable the formation cabinet in the preset system acquisition software program module if the actual emptying test data does not satisfy a second control condition; and a third processing module configured to display that the formation cabinet has an abnormality and disable the formation cabinet in the preset system acquisition software program module if the actual formation test data does not satisfy the third control condition.

[0025] According to another aspect of the embodiments of the present application, a computer program product is also provided, which comprises a non-volatile computer readable storage medium storing a computer program, and the computer program is executed by a processor to implement the control method of the lithium battery interface black spot.

[0026] According to another aspect of the embodiments of the present application, an electronic device is also provided, which comprises one or more processors and a memory, and the memory is configured to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the lithium battery interface black spot.

[0027] In the present application, a preset control condition is determined, a formation test tool is used to simulate the battery cell, the formation test tool is placed into the formation cabinet for simulation test, actual simulation test data is obtained, it is judged whether the actual simulation test data satisfies a first control condition, in the case that the actual simulation test data satisfies the first control condition, the formation cabinet is subjected to an emptying test, actual emptying test data is obtained, and it is judged whether the actual emptying test data satisfies a second control condition, in the case that the actual emptying test data satisfies the second control condition, the battery cell is placed into the formation cabinet for formation test, actual formation test data is obtained, and it is judged whether the actual formation test data satisfies a third control condition, in the case that the actual formation test data satisfies the third control condition, the control of the lithium battery interface black spot is completed, and thus the technical problem that the battery cell interface generates black spots due to improper negative pressure control in the related art is solved.

[0028] In the present application, by determining the first control condition, the second control condition and the third control condition, the formation blocking test tool is used to simulate the battery cell, and the formation blocking test tool is put into the formation cabinet for simulation test, so that the actual simulation test data can be obtained. First, it can be judged whether the actual simulation test data meets the first control condition. In the case that the actual simulation test data meets the first control condition, the empty pumping test is carried out on the formation cabinet, so that the actual empty pumping test data can be obtained. Then, it can be judged whether the actual empty pumping test data meets the second control condition. In the case that the actual empty pumping test data meets the second control condition, the battery cell is put into the formation cabinet for formation test, so that the actual formation test data can be obtained. Then, it can be judged whether the actual formation test data meets the third control condition. In the case that the actual formation test data meets the third control condition, the control of the lithium battery interface black spot is completed. The problem of uncontrolled battery cell pumping negative pressure is solved. The generation of the negative electrode surface black spot of the lithium battery cell in the first charge-discharge activation stage is effectively controlled. The technical effect of black spot suppression is realized. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0030] Figure 1 is a flow chart of an optional control method of lithium battery interface black spot according to an embodiment of the present application;

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

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

[0033] Figure 4 is a hardware structure block diagram of an electronic device (or mobile device) for a control method of lithium battery interface black spot according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", and the like in the description and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] It should be noted that the information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) collected and related to the present application are all authorized by the user or authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of related data comply with relevant laws, regulations and standards in relevant regions, necessary security measures are taken, public order and good customs are not violated, and appropriate operation portals are provided for users to choose authorization or refusal. For example, interfaces are provided between the system and related users or agencies, and before obtaining the relevant information, the interface needs to send a request to the aforementioned user or agency, and after receiving the consent information feedback from the aforementioned user or agency, the relevant information is obtained.

[0037] In the present application, the negative pressure deviation from the specification range will cause the generation of interface black spots. To solve the problem of black spots caused by the breakage of lithium ion interface transmission caused by the unbalanced production and exhaust of negative pressure out of specification, a formation negative pressure monitoring and evaluation system is used, and an MES (Manufacturing Execution System) system acquisition software program module is added, without the participation of reagents, safe and environmentally friendly, thereby solving the problem of uncontrolled negative pressure extraction of the battery cell.

[0038] The present application will be described in detail below in conjunction with various embodiments.

[0039] Embodiment one

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

[0041] Figure 1is a flow chart of an optional control method of a lithium battery interface black spot according to an embodiment of the present application, as shown in Figure 1 The method comprises the following steps:

[0042] In step S101, a preset control condition is determined, wherein the preset control condition is used to control the formation of black spots on the interface of the lithium battery cell during formation testing, and the preset control condition at least includes a first control condition, a second control condition, and a third control condition.

[0043] Optionally, the preset control condition refers to a series of precise negative pressure control standards set during the formation testing process to prevent the formation of black spots on the interface of the battery cell.

[0044] In this embodiment, the preset control condition can 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 be used for negative pressure control during formation testing, cabinet body vacuum testing, and cell formation testing, respectively.

[0045] In step S102, a formation testing device is used to simulate a cell, and the formation testing device is placed in a formation cabinet for simulation testing to obtain actual simulation test data, and it is determined whether the actual simulation test data meets the first control condition.

[0046] Optionally, the formation testing device is a device used to simulate the state of a cell in a formation cabinet, which can include a negative pressure table and other monitoring tools to simulate and test the negative pressure response of the cell during the formation process.

[0047] In this embodiment, according to the first control condition (such as a 1-minute testing time, and after 1 minute, the actual negative pressure value stabilizes at -70 kPa), the actual negative pressure value and time data can be collected and recorded by the negative pressure table of the formation testing device, and it is evaluated whether the actual negative pressure state is stable and reaches -70 kPa. If the actual simulation test data (i.e., the testing time and the actual negative pressure value) meets the first control condition, it indicates that the negative pressure control of the formation cabinet under the simulated state of the cell meets the requirements, providing a basis for subsequent testing.

[0048] In step S103, in the case where the actual simulation test data meets the first control condition, the formation cabinet is subjected to a vacuum test to obtain actual vacuum test data, and it is determined whether the actual vacuum test data meets the second control condition.

[0049] Optionally, in the case where the actual simulation test data meets the first control condition, the formation cabinet can be subjected to a vacuum test. The vacuum test of the formation cabinet is a negative pressure test independent of the state of the cell, which is used to evaluate the vacuum pumping capacity of the cabinet itself.

[0050] In the embodiment, according to the second control condition (for example, the air pumping time is 10 seconds, and when 10 seconds is reached, the actual negative pressure value is greater than -50 kPa), the actual negative pressure value and the time data can be collected and recorded by the negative pressure table of the formation cabinet, and it is judged whether the vacuum pumping capacity of the formation cabinet meets the second control condition (that is, when 10 seconds is reached, the actual negative pressure value is greater than -50 kPa). If the actual air pumping test data (that is, the air pumping time and the actual negative pressure value) meet the second control condition, it indicates that the vacuum pumping capacity of the formation cabinet meets the standard when there is no battery cell, and a good environment foundation is provided for the battery cell formation test.

[0051] In step S104, in the case that the actual air pumping test data meet the second control condition, the battery cell is placed in the formation cabinet for formation test, actual formation test data are obtained, and it is judged whether the actual formation test data meet the third control condition.

[0052] Optionally, in the case that the actual air pumping test data meet the second control condition, the battery cell is placed in the formation cabinet for formation test, and the battery cell formation test is a negative pressure control test actually performed on the battery cell in the formation cabinet.

[0053] In the embodiment, according to the preset third control condition (for example, the formation time is 90 seconds, and within 90 seconds, the actual negative pressure value needs to reach -80 kPa, which can have a deviation of ±5 kPa), the actual negative pressure value and the time data can be collected and recorded by the negative pressure table of the formation cabinet, so as to evaluate whether the negative pressure condition of the battery cell in the formation process meets the third control condition (that is, within 90 seconds, the actual negative pressure value needs to reach -80±5 kPa).

[0054] In step S105, in the case that the actual formation test data meet the third control condition, the control of the lithium battery interface black spot is completed.

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

[0056] In summary, the negative pressures in the formation test process, the air pumping of the formation cabinet and the formation process of the battery cell are measured respectively, and the first control condition, the second control condition and the third control condition are used respectively to ensure that the negative pressure values and the time in each stage meet the corresponding control conditions, so as to effectively control the formation of the lithium battery interface black spot, improve the battery cycle performance and the quality standard, the whole process does not need additional equipment or frequent manual adjustment, realizes the automatic and standardized negative pressure control, improves the production efficiency and the battery consistency, and further solves the technical problem that the battery cell interface generates black spots due to improper negative pressure control in the related art.

[0057] The formation blockage detection tool at least includes a negative pressure gauge. In the method for controlling the interface black spot of the lithium battery provided in Embodiment One of the present application, for a plurality of formation cabinets, historical negative pressure value data is collected by using the negative pressure gauge according to a first preset time interval, and a plurality of first negative pressure curves are constructed based on all the collected historical negative pressure value data, wherein the horizontal coordinate of the first negative pressure curve is discrete collection time composed of collection time of the plurality of 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 time. 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 times is less than a preset difference threshold. In the case that the difference between the historical negative pressure value data corresponding to two adjacent collection times is less than the preset difference threshold, the time length corresponding to the latter collection time of the two adjacent collection times is determined as a preset blockage detection time length. The first control condition is determined based on each historical negative pressure value data and the preset blockage detection time length.

[0058] Optionally, for a plurality of formation cabinets, the historical negative pressure value data can be continuously collected by using the negative pressure gauge on the formation blockage detection tool at a first preset time interval (such as every 10 seconds), and these data will be used for subsequent analysis to determine the negative pressure stability of the formation cabinet within a specific time window.

[0059] In the present embodiment, according to all the collected historical negative pressure value data, a first negative pressure curve can be constructed, wherein the horizontal coordinate is discrete collection time composed of collection time of the plurality of historical negative pressure value data, and the vertical coordinate is the historical negative pressure value data corresponding to each collection time. The first negative pressure curve can visualize the negative pressure change trend of each formation cabinet in the blockage detection stage, thereby providing a basis for the next step of analysis.

[0060] In the present embodiment, the difference between the historical negative pressure value data corresponding to each two adjacent collection times (i.e. two adjacent collection points in the time sequence) is calculated, and it is determined whether these differences are less than a preset difference threshold (a set standard, such as 0, which can measure whether the change of the negative pressure value between adjacent collection times tends to be stable). By comparing the difference with the preset difference threshold, the stability of the negative pressure control of the formation cabinet within the first preset time interval can be evaluated. In the present embodiment, in the case that the difference between the historical negative pressure value data corresponding to two adjacent collection times is less than the preset difference threshold, the time length corresponding to the latter collection time of the two adjacent collection times can be determined as a preset blockage detection time length (such as 1 minute). According to each historical negative pressure value data and the preset blockage detection time length, the first control condition can be determined.

[0061] To improve the accuracy of determining the first control condition, in the method for controlling the interface black spot of the lithium battery provided in Embodiment One of the present application, the mean value calculation is performed on the plurality of historical negative pressure value data to obtain the mean value of the historical negative pressure value data, and based on the mean value, the standard deviation calculation is performed on the historical negative pressure value data 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 value and the preset standard deviation are added to obtain a preset standard negative pressure value; the condition that the actual measurement negative pressure value at the preset clogging detection time length is greater than the preset standard negative pressure value is determined as the first control condition.

[0062] Optionally, the mean value calculation is performed on the plurality of historical negative pressure value data obtained from the plurality of first negative pressure curves to obtain the mean value of the historical negative pressure value data, and based on the mean value, the standard deviation of the historical negative pressure value data can be calculated, and the standard deviation can measure the fluctuation degree of the negative pressure value data.

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

[0064] To accurately determine the second control condition, in the method for controlling the interface black spot of the lithium battery provided in Embodiment One of the present application, the historical empty pumping test data is collected, wherein the historical empty pumping test data at least includes: a historical empty pumping negative pressure value and a preset empty pumping time length, the historical empty pumping negative pressure value refers to the negative pressure value measured when the empty pumping time length reaches the preset empty pumping time length; the condition that the actual measurement negative pressure value is less than the historical empty pumping negative pressure value is determined as the second control condition.

[0065] Optionally, the historical empty pumping test data at least includes a historical empty pumping negative pressure value (such as -50 kpa) and a preset empty pumping time length (such as 10 seconds), and the historical empty pumping negative pressure value refers to the actual measurement negative pressure value inside the formation cabinet when the empty pumping test is performed on the formation cabinet and the empty pumping time length reaches the preset empty pumping time length.

[0066] In the present embodiment, when the actual empty pumping test is performed on the formation cabinet, the measured actual measurement negative pressure value can be monitored and recorded, and if the actual measurement negative pressure value of the formation cabinet is less than the historical empty pumping negative pressure value when the preset empty pumping time length is reached, the condition can be determined as the second control condition. The setting of the second control condition aims to prompt the operator or the system that the empty pumping performance of the formation cabinet may have a problem, and measures can be taken for adjustment or maintenance to ensure the stability and consistency of the negative pressure control.

[0067] The formation cabinet at least includes a negative pressure table. In the method for controlling the interface black spot of the lithium battery provided in the first embodiment, for a plurality of formation cabinets, a standard negative pressure value of each formation cabinet for cell formation is determined. According to a first preset time interval, historical negative pressure value data is collected by using the negative pressure table, and a second negative pressure curve is constructed based on all the collected historical negative pressure value data, wherein the horizontal coordinate of the second negative pressure curve is discrete collection time composed of collection time of the plurality of historical negative pressure value data, and the vertical coordinate of the second negative pressure curve is historical negative pressure value data corresponding to each collection time. Based on the second negative pressure curve, a time length required for the historical negative pressure value data to reach the standard negative pressure value is determined as a formation standard time length. Based on the standard negative pressure value and the formation standard time length, the third control condition is determined.

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

[0069] In the present embodiment, the negative pressure table 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). Based on all the collected historical negative pressure value data, a second negative pressure curve can be constructed, wherein the horizontal coordinate represents discrete collection time composed of data collection time, and the vertical coordinate represents specific historical negative pressure value data corresponding to each collection time. The second negative pressure curve directly reflects the change trend of the negative pressure value of the formation cabinet during the formation stage, and provides a visual tool for subsequent analysis.

[0070] In the present embodiment, by analyzing the second negative pressure curve, a time length required for the historical negative pressure value data to reach the standard negative pressure value can be determined as a formation standard time length (i.e. a time length in which the formation cabinet can quickly and stably reach the standard negative pressure value). The formation cabinet can provide a stable and required negative pressure environment within a specified time, thereby ensuring the quality and efficiency of cell formation. According to the standard negative pressure value and the formation standard time length of the formation cabinet, the third control condition can be determined.

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

[0072] Optionally, in order to identify the average level of the time required for the formation cabinet to reach the expected negative pressure state (i.e. the standard negative pressure value), the mean value calculation can be performed on the formation standard time length of the plurality of formation cabinets when reaching the standard negative pressure value to obtain the mean value of the formation standard time length, thereby providing a reference benchmark for the subsequent setting of the control condition.

[0073] In the present embodiment, according to the mean value of the formation standard time length, the standard deviation calculation of the formation standard time length can be performed to obtain the standard deviation of the formation standard time length, the standard deviation of the formation standard time length is multiplied by a preset multiple (for example, 3) to obtain a preset time standard deviation, and the mean value of the formation standard time length is added to the preset time standard deviation to obtain a preset formation standard time length (for example, 90 seconds), and the condition that the actual measured negative pressure value reaches the standard negative pressure value within the preset formation standard time length is determined as the third control condition.

[0074] In order to accurately determine the black spot level, in the control method for the interface black spot of the lithium battery provided in Embodiment One of the present application, the black spot level is determined based on the preset control condition, wherein the black spot level at least includes: a first level, a second level, and a third level; in the case that the first control condition, the second control condition and the third control condition are all met, the black spot level is determined as the first level; in the case that 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 as the second level; and in the case that the first control condition, the second control condition and the third control condition are all not met, the black spot level is determined as the third level.

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

[0076] In the embodiment, the black spot area ratio of the first level is less than 0.1%, the black spot area ratio of the second level is greater than 0.1% and less than 0.3%, and the black spot area ratio of the third level is greater 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 standard requirement of the plugging tooling stage, M2 is the negative pressure specification and standard requirement of the empty pumping stage, and M3 is the negative pressure specification and standard requirement of the pressing stage.

[0077] In the embodiment, if the formation cabinet meets the preset negative pressure specification and standard requirement in the plugging tooling stage, the empty pumping stage and the pressing stage (i.e., simultaneously meets the first control condition M1, the second control condition M2 and the third control condition M3), the black spot level can be determined as the first level (i.e., the black spot area ratio is 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 the least.

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

[0079] In the embodiment, if the formation cabinet does not meet the corresponding control condition in the above three stages, the black spot level can be determined as the third level (i.e., the black spot area ratio is greater 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, and the black spot problem is serious, which needs to be immediately adjusted and optimized.

[0080] In order to accurately identify the abnormality of the formation cabinet, in the control method of the lithium battery interface black spot provided in Embodiment One of the present application, if the actual simulation test data does not meet the first control condition, the formation cabinet is displayed as having an abnormality in the preset system acquisition software program module and is disabled; or if the actual empty pumping test data does not meet the second control condition, the formation cabinet is displayed as having an abnormality in the preset system acquisition software program module and is disabled; or if the actual formation test data does not meet the third control condition, the formation cabinet is displayed as having an abnormality in the preset system acquisition software program module and is disabled.

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

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

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

[0084] In this embodiment, if the negative pressure value in the actual formation test data does not reach the third control condition (i.e. unable to reach a negative pressure value of-80±5kPa within 90 seconds) within the preset formation standard time (such as 90 seconds) when the formation cabinet is in contact with the battery cell and starts the formation process, the preset system acquisition software program module will trigger an alarm, display that the formation cabinet has an abnormality, and the formation cabinet can be disabled. This ensures the stability and timeliness of the negative pressure during the formation process, and avoids battery cell quality problems caused by negative pressure fluctuations or insufficient duration.

[0085] Figure 2 is a schematic diagram of an optional formation negative pressure system working principle according to an embodiment of the application, as shown in 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 liquid discharge valve, a vacuum breaking valve, a filter, a negative pressure cup, a negative pressure nozzle, a battery cell, and a dry gas source. When the formation process starts, the negative pressure source in the system starts to work to generate 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 negative pressure gauge installed on the formation cabinet can monitor the negative pressure value in real time and feed back the data to the preset system acquisition software program module. The negative pressure nozzle is connected to the battery cell exhaust port. When the battery cell generates gas and misty electrolyte during the formation process, the gas and misty 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 backflow function of most liquid. The gas-liquid mixture that is not completely separated can further enter the gas-liquid separator to realize 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 to introduce dry gas (such as nitrogen or argon) in the dry gas source into the system. The dry gas source can make the negative pressure state inside the battery cell or the sealed cavity gradually recover to normal pressure after impurities are removed by the filter. Then, the liquid in the gas-liquid separator can be discharged from the system through the liquid discharge valve to maintain the cleanliness and normal operation of the system.

[0086] In an optional embodiment, the control method of the lithium battery interface black spot can be performed by using the formation negative pressure system working principle as shown in Figure 2

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

[0088] The following will be described in detail in combination with another embodiment.

[0089] Embodiment Two

[0090] The control device for the lithium battery interface black spot provided in the embodiment includes a plurality of implementation units, each of which corresponds to each implementation step in the above embodiment one.

[0091] Figure 3 ​is a schematic diagram of an optional lithium battery interface black spot control device according to an embodiment of the application, as shown, the lithium battery interface black spot control device can include: a first determination unit 30, a first judgment unit 31, a second judgment unit 32, a third judgment unit 33, a first completion unit 34. Figure 3

[0092] The first determination unit 30 is configured to determine a preset control condition, wherein the preset control condition is used to control the formation of black spots in the lithium battery cell during formation testing, 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 configured to simulate the cell using a formation test blocking tool, and place the formation test blocking tool into a formation cabinet for simulation testing to obtain actual simulation test data, and determine whether the actual simulation test data meets the first control condition.

[0094] The second judgment unit 32 is configured to, in the case that the actual simulation test data meets the first control condition, perform a vacuum test on the formation cabinet to obtain actual vacuum test data, and determine whether the actual vacuum test data meets the second control condition.

[0095] The third judgment unit 33 is configured to, in the case that the actual vacuum test data meets the second control condition, place the cell into the formation cabinet for formation testing to obtain actual formation test data, and determine whether the actual formation test data meets the third control condition.

[0096] The first completion unit 34 is configured to, in the case that the actual formation test data meets the third control condition, complete the control of the lithium battery interface black spot.

[0097] The above-mentioned lithium battery interface black spot control device can determine the preset control condition through the first determination unit 30, simulate the cell using the formation test blocking tool through the first judgment unit 31, place the formation test blocking tool into the formation cabinet for simulation testing to obtain the actual simulation test data, determine whether the actual simulation test data meets the first control condition, perform the vacuum test on the formation cabinet through the second judgment unit 32 in the case that the actual simulation test data meets the first control condition to obtain the actual vacuum test data, and determine whether the actual vacuum test data meets the second control condition, place the cell into the formation cabinet for formation testing through the third judgment unit 33 in the case that the actual vacuum test data meets the second control condition to obtain the actual formation test data, and determine whether the actual formation test data meets the third control condition, and complete the control of the lithium battery interface black spot through the first completion unit 34 in the case that the actual formation test data meets the third control condition.

[0098] ​Optionally, the formation blocking detection tool at least comprises a negative pressure gauge, the first determining unit comprises: a first construction module, configured to, for a plurality of formation cabinets, collect historical negative pressure value data by using the negative pressure gauge according to a first preset time interval, and construct a plurality of 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 discrete collection time composed of collection time of the plurality of 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 time; a first judgment module, configured to judge whether the difference between the historical negative pressure value data corresponding to each two adjacent collection times is less than a preset difference threshold based on each first negative pressure curve; a first determination module, configured to determine the time length corresponding to the latter one of the two adjacent collection times as a preset blocking detection time length in the case that the difference between the historical negative pressure value data corresponding to the two adjacent collection times is less than the preset difference threshold; and a second determination module, configured to determine the first control condition based on each historical negative pressure value data and the preset blocking detection time length.

[0099] Optionally, the second determination module comprises: a first calculation submodule, configured to perform mean value calculation on the plurality of historical negative pressure value data to obtain the mean value of the historical negative pressure value data, and perform standard deviation calculation on the historical negative pressure value data based on the mean value to obtain the standard deviation of the historical negative pressure value data; a second calculation submodule, configured 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, configured to add the mean value and the preset standard deviation to obtain a preset standard negative pressure value; and a first determination submodule, configured to determine the condition that the actual measured negative pressure value at the preset blocking detection time length is greater than the preset standard negative pressure value as the first control condition.

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

[0101] Optionally, the formation cabinet body at least comprises a negative pressure table, the first determination unit comprises: a fourth determination module, configured to determine, for the plurality of formation cabinet bodies, a standard negative pressure value of the electric core formation of each formation cabinet body; a second construction module, configured to collect historical negative pressure value data by 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 horizontal coordinate of the second negative pressure curve is discrete collection time composed of collection time of the plurality of historical negative pressure value data, and the vertical coordinate of the second negative pressure curve is historical negative pressure value data corresponding to each collection time; a second judgment module, configured to determine, based on the second negative pressure curve, a time length required for the historical negative pressure value data to reach the standard negative pressure value, and determine the time length as a formation standard time length; and a fifth determination module, configured to determine a third control condition based on the standard negative pressure value and the formation standard time length.

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

[0103] Optionally, the control device comprises: a sixth determination module, configured to determine, based on the preset control condition, a black spot level after determining the preset control condition, wherein the black spot level at least comprises: a first level, a second level, and a third level; a seventh determination module, configured to determine the black spot level as the first level in a case that the first control condition, the second control condition, and the third control condition are all satisfied; an eighth determination module, configured to determine the black spot level as the second level in a case that at least one of the first control condition, the second control condition, and the third control condition is satisfied; and a ninth determination module, configured to determine the black spot level as the third level in a case that the first control condition, the second control condition, and the third control condition are all not satisfied.

[0104] Optionally, the control device comprises: a first processing module configured to display that the formation cabinet has an abnormality in the preset system acquisition software program module and disable the formation cabinet if the actual simulation test data does not meet the first control condition; a second processing module configured to display that the formation cabinet has an abnormality in the preset system acquisition software program module and disable the formation cabinet if the actual emptying test data does not meet the second control condition; and a third processing module configured to display that the formation cabinet has an abnormality in the preset system acquisition software program module and disable the formation cabinet if the actual formation test data does not meet the third control condition.

[0105] The control device for the black spot on the interface of the lithium battery can further comprise a processor and a memory, the first determining unit 30, the first judging unit 31, the second judging unit 32, the third judging unit 33, and the first completing unit 34 are stored in the memory as program units, and the processor executes the program units stored in the memory to realize the corresponding functions.

[0106] The processor comprises a core, and the core retrieves the corresponding program units from the memory. The core can be one or more, and the control of the black spot on the interface of the lithium battery is completed based on the preset control condition by adjusting the core parameters.

[0107] The memory can comprise a non-permanent memory in a computer readable medium, a random access memory (RAM), and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory comprises at least one memory chip.

[0108] According to another aspect of the embodiment of the present application, a computer program product is also provided, comprising a non-volatile computer readable storage medium, the non-volatile computer readable storage medium storing a computer program, and the computer program is executed by a processor to realize the control method of the black spot on the interface of the lithium battery according to any one of the above.

[0109] When the computer program product is executed on the data processing device, the program initialized with the following method steps is adapted to be executed: determining a preset control condition, simulating the battery cell with the formation and blockage testing tool, and placing the formation and blockage testing tool into the formation cabinet for simulation testing to obtain actual simulation testing data, judging whether the actual simulation testing data meets the first control condition, in the case that the actual simulation testing 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 the second control condition, in the case that the actual empty pumping test data meets the second control condition, placing the battery cell into the formation cabinet for formation testing to obtain actual formation testing data, and judging whether the actual formation testing data meets the third control condition, in the case that the actual formation testing data meets the third control condition, completing the control of the lithium battery interface black spot.

[0110] According to another aspect of the embodiments of the present application, an electronic device is also provided, which includes one or more processors and a memory storing 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 above-mentioned control method of the lithium battery interface black spot.

[0111] Figure 4 is a hardware structure block diagram of an electronic device (or mobile device) for a control method of a lithium battery interface black spot according to an embodiment of the present application. As shown in Figure 4 , the electronic device can include one or more processors (for example, processors 402a, 402b, …, 402n, etc. in Figure 4 , which can include but are not limited to processing devices such as microprocessors MCU or programmable logic devices FPGA, etc.), a memory 404 for storing data. In addition, it can also include a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which can be included as one of the ports of the I / O interface), a network interface, a keyboard, a power supply and / or a camera. Those skilled in the art can understand that Figure 4 The structure shown is only schematic, which does not limit the structure of the above-mentioned electronic device. For example, the electronic device can also include more or fewer components than Figure 4 , or have a different configuration from Figure 4 .

[0112] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0113] The embodiments or examples of the present disclosure are not exhaustive, and are only a part of the embodiments or examples, and are not specific limitations on the protection scope of the present disclosure. Each step in a certain embodiment or example can be implemented as an independent example, and the steps can be combined arbitrarily, for example, a 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 exchanged arbitrarily, in addition, the optional ways or optional examples in a certain embodiment or example can be combined arbitrarily; in addition, the embodiments or examples can be combined arbitrarily, for example, the steps of different embodiments or examples can be combined arbitrarily, a certain embodiment or example can be combined with the optional ways or optional examples of other embodiments or examples.

[0114] In the above-described embodiments of the present disclosure, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0115] In the several embodiments of the present disclosure, it should be understood that the disclosed technology can be implemented in other ways. Of course, the embodiment described above is only a schematic, for example, the division of the units can be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, unit or module, and can be electrical or other forms.

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

[0117] In addition, each functional unit in each embodiment of the present disclosure can be integrated in a processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0118] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0119] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A method for controlling black spots on the interface of a lithium battery, characterized in that, The method comprises the following steps: determining a preset control condition, wherein the preset control condition is used to control the formation of black spots on the lithium battery during formation testing, and the preset control condition at least includes a first control condition, a second control condition, and a third control condition; using a formation test blocking tool to simulate the battery, and placing the formation test blocking tool into a formation cabinet for simulation testing to obtain actual simulation test data, and determining whether the actual simulation test data meets the first control condition; in the case that the actual simulation test data meets the first control condition, performing an emptying test on the formation cabinet to obtain actual emptying test data, and determining whether the actual emptying test data meets the second control condition; wherein the first control condition is determined based on historical negative pressure value data collected by a negative pressure table included in the formation test blocking tool and a preset test blocking time length, and the preset test blocking time length is determined by first negative pressure curve construction on the historical negative pressure value data; the second control condition is determined based on an actual measured negative pressure value and collected historical emptying negative pressure value; in the case that the actual emptying test data meets the second control condition, placing the battery into the formation cabinet for formation testing to obtain actual formation test data, and determining whether the actual formation test data meets the third control condition; wherein the third control condition is determined based on a standard negative pressure value of each formation cabinet and a formation standard time length, and the formation standard time length is determined by second negative pressure curve construction on historical negative pressure value data collected by a negative pressure table included in the formation cabinet; in the case that the actual formation test data meets the third control condition, the control of the lithium battery interface black spot is completed.

2. The method of controlling black spots of a lithium battery interface according to claim 1, characterized by, The formation test blocking tool at least includes a negative pressure table, and the step of determining the first control condition comprises: for a plurality of formation cabinets, collecting historical negative pressure value data by the negative pressure table according to a first preset time interval, and constructing a plurality of 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 a plurality of collection time points of the 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 time point; based on each first negative pressure curve, determining whether the difference between the historical negative pressure value data corresponding to each two adjacent collection time points is less than a preset difference threshold value; in the case that the difference between the historical negative pressure value data corresponding to two adjacent collection time points is less than the preset difference threshold value, determining the time length corresponding to the latter collection time point of the two adjacent collection time points as a preset test blocking time length; determining the first control condition based on each historical negative pressure value data and the preset test blocking time length.

3. The method of controlling black spots of a lithium battery interface according to claim 2, characterized by, The step of determining the first control condition based on each historical negative pressure value data and the preset test blocking time length comprises: The mean value of the historical negative pressure value data is calculated, and the mean value of the historical negative pressure value data is obtained. Based on the mean value, the standard deviation of the historical negative pressure value data is calculated, and the standard deviation of the historical negative pressure value data is obtained. The standard deviation of the historical negative pressure value data is multiplied by a preset multiple to obtain a preset standard deviation. The mean value and the preset standard deviation are added to obtain a preset standard negative pressure value. The condition that the actual measured negative pressure value is greater than the preset standard negative pressure value at the preset plugging detection time is determined as the first control condition.

4. The method of controlling black spots of a lithium battery interface according to claim 1, wherein The step of determining the second control condition comprises: Collecting historical empty pumping test data, wherein the historical empty pumping test data at least includes: historical empty pumping negative pressure value, preset empty pumping time, the historical empty pumping negative pressure value refers to the negative pressure value measured when the empty pumping time reaches the preset empty pumping time; The condition that the actual measured negative pressure value is less than the historical empty pumping negative pressure value is determined as the second control condition.

5. The method of controlling black spots of a lithium battery interface according to claim 1, wherein The formation cabinet at least includes a negative pressure table, and the step of determining the third control condition comprises: For a plurality of the formation cabinets, the standard negative pressure value of each of the formation cabinets for cell formation is determined; According to a first preset time interval, historical negative pressure value data is collected by using the negative pressure table, and based on all the collected historical negative pressure value data, a second negative pressure curve is constructed, wherein the horizontal coordinate of the second negative pressure curve is a discrete collection time composed of a plurality of collection time points of the historical negative pressure value data, and the vertical coordinate of the second negative pressure curve is the historical negative pressure value data corresponding to each of the collection time points. 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 determined as a formation standard time. Based on the standard negative pressure value and the formation standard time, the third control condition is determined.

6. The method of controlling black spots of a lithium battery interface according to claim 5, wherein The step of determining the third control condition based on the standard negative pressure value and the formation standard time comprises: The mean value of a plurality of the formation standard times is calculated to obtain the mean value of the formation standard times, and based on the mean value, the standard deviation of the formation standard times is calculated to obtain the standard deviation of the formation standard times; The standard deviation is multiplied by a preset multiple to obtain a preset time standard deviation; The mean value and the preset time standard deviation are added to obtain a preset formation standard time; The condition that the actual measured negative pressure value reaches the standard negative pressure value within the preset formation standard time is determined as the third control condition.

7. The method of controlling black spots on the interface of a lithium battery according to claim 1, characterized in that, After determining the preset control condition, it further comprises: Based on the preset control condition, a black spot level is determined, wherein the black spot level at least includes: a first level, a second level, and a third level; In the case of simultaneously satisfying the first control condition, the second control condition and the third control condition, the black spot level is determined as the first level; In the case of satisfying at least one of the first control condition, the second control condition and the third control condition, the black spot level is determined as the second level; In the case that 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 as the third level.

8. The method of controlling black spots on the interface of a lithium battery according to claim 1, characterized in that, The control method of the lithium battery interface black spot further comprises: In the case that the actual simulation test data does not meet the first control condition, it is displayed in the preset system acquisition software program module that the formation cabinet exists an abnormality, and the formation cabinet is disabled; or, In the case that the actual emptying test data does not meet the second control condition, it is displayed in the preset system acquisition software program module that the formation cabinet exists an abnormality, and the formation cabinet is disabled; or, In the case that the actual formation test data does not meet the third control condition, it is displayed in the preset system acquisition software program module that the formation cabinet exists an abnormality, and the formation cabinet is disabled.

9. A device for controlling black spots at the interface of a lithium battery, characterized in that Comprise: A first determination unit is configured to determine a preset control condition, wherein the preset control condition is used to control the formation of black spots on the lithium battery cell 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 configured to simulate the cell by using a formation test tool, and put the formation test tool into a formation cabinet for simulation test to obtain actual simulation test data, and judge whether the actual simulation test data meets the first control condition; A second judgment unit is configured to, in the case that the actual simulation test data meets the first control condition, perform an emptying test on the formation cabinet to obtain actual emptying test data, and judge whether the actual emptying test data meets the second control condition; wherein the first control condition is determined based on historical negative pressure value data collected by a negative pressure table included in the formation test tool and a preset test duration, and the preset test duration is determined by first negative pressure curve construction on the historical negative pressure value data; and the second control condition is determined based on an actual measured negative pressure value and collected historical emptying negative pressure value; A third judgment unit is configured to, in the case that the actual emptying test data meets the second control condition, put the cell into the formation cabinet for formation test to obtain actual formation test data, and judge whether the actual formation test data meets the third control condition; wherein the third control condition is determined based on a standard negative pressure value of each formation cabinet and a formation standard duration, and the formation standard duration is determined by second negative pressure curve construction on historical negative pressure value data collected by a negative pressure table included in the formation cabinet; A first completion unit is configured to, in the case that the actual formation test data meets the third control condition, complete the control of the lithium battery interface black spot.

10. A computer program product, characterised in that, The non-volatile computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the control method of the lithium battery interface black spot according to any one of claims 1 to 8.

11. An electronic device, comprising: The application relates to a lithium battery interface black spot control method, comprising one or more processors and a memory for storing 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 lithium battery interface black spot control method according to any one of claims 1 to 8.

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