A method, device and equipment for detecting the blockage of the formation negative pressure pipeline

Abstract

The present invention relates to the technical field of batteries. A method, device and equipment for detecting the blockage of the formation negative pressure pipeline are provided. The method includes: drawing a formation voltage curve corresponding to each first formation battery cell in the formation cabinet; setting at least one detection point on each formation voltage curve; obtaining the detection voltage and the average detection point voltage corresponding to each detection point; and determining the blockage condition of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average detection point voltage. The method provided by the present invention determines the blockage condition of the negative pressure pipeline of the corresponding battery cell by setting detection points on the formation voltage curve corresponding to the battery cell and according to the detection voltage and the average detection point voltage of the detection points, which not only improves the detection efficiency and accuracy, but also reduces the detection cost.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a method, device and equipment for detecting the blockage of a formation negative pressure pipeline. Background Art

[0002] In the production process of power batteries, the high-temperature negative pressure formation process plays a crucial role, which is directly related to the stability and safety of battery performance. Formation refers to the first charging of newly produced batteries, enabling the electrode materials to undergo chemical reactions to form stable electrode structures and properties. The main objective of this process is to form a stable solid electrolyte interface (SEI) film and activate the battery cells, and the negative pressure environment is particularly critical in this process. The role of the negative pressure system is to effectively extract the gases generated during the formation process due to electrolyte decomposition or other side reactions, preventing these gases from adsorbing on the surface of the electrode plates, and thus avoiding the formation of "dead lithium". Once "dead lithium" is generated, it cannot be consumed through conventional charge and discharge cycles. Instead, it will accumulate continuously during the charge and discharge process and gradually grow into lithium dendrites. The growth of lithium dendrites may pierce the battery separator, resulting in an internal short circuit of the battery cell, thereby triggering serious safety hazards.

[0003] In order to monitor the smoothness of the negative pressure pipeline and ensure the smooth progress of the formation process, the detection methods commonly used in the prior art are as follows: One is to directly install a flow detector or a liquid level sensor in the negative pressure pipeline to monitor the gas flow; the other is to regularly use a tooling for flow testing. For the blockage detection of the library negative pressure pipeline, the specific method is to place the tooling in the library, and after the cylinder is closed, a negative pressure pumping operation is performed on the tooling. The digital flowmeter on the tooling transmits the collected flow data to the upper computer through the communication network port for analysis. However, both of these methods have certain limitations in practical applications. First, for the blockage detection of the formation negative pressure pipeline, if a flow detector or a liquid level sensor is installed in each negative pressure pipeline, considering that one pipeline corresponds to one battery cell, this will result in extremely high hardware costs. In addition, considering that the formation room is mostly in a high-temperature environment, the maintenance cost of the sensors is also relatively high. Second, blindly using the tooling for flow testing of the formation cabinet is feasible, but the testing process is time-consuming and requires a large amount of manpower input, resulting in low detection efficiency.

[0004] Therefore, in view of the problems of high cost and low efficiency in detecting the blockage of the negative pressure pipeline in the prior art, it is necessary to develop a more economical, efficient and applicable method for detecting the blockage of the formation negative pressure pipeline for large-scale production lines to ensure the safety and quality of battery production. Summary of the Invention

[0005] The present invention provides a method, device and equipment for detecting the blockage of a formation negative pressure pipeline, so as to solve the defects of high cost and low efficiency in detecting the blockage of the negative pressure pipeline in the prior art and achieve economical and efficient detection.

[0006] The present invention provides a method for detecting blockage of the formation negative pressure pipeline, including:

[0007] Step 1: Draw the formation voltage curve corresponding to each first formation battery cell in the formation cabinet;

[0008] Step 2: Set at least one detection point on each of the formation voltage curves;

[0009] Step 3: Obtain the detection voltage and the average detection point voltage corresponding to each detection point;

[0010] Step 4: Determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average detection point voltage.

[0011] According to the method for detecting blockage of the formation negative pressure pipeline provided by the present invention, Step 4 includes:

[0012] Step 41: Based on the detection voltage of each detection point and the average detection point voltage, determine the average voltage pressure difference of the detection point;

[0013] Step 42: Determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to whether the average voltage pressure difference of the detection point is within the threshold range.

[0014] According to the method for detecting blockage of the formation negative pressure pipeline provided by the present invention, two detection points are set on each of the formation voltage curves, namely the first detection point and the second detection point; the first detection point and the second detection point are set in the order of increasing time;

[0015] The first detection point corresponds to the first detection voltage and the first average detection point voltage; the second detection point corresponds to the second detection voltage and the second average detection point voltage;

[0016] Step 41 includes: Determine the first average voltage pressure difference according to the first detection voltage and the first average detection point voltage; determine the second average voltage pressure difference according to the second detection voltage and the second average detection point voltage;

[0017] Step 42 includes:

[0018] Based on the second average voltage pressure difference and the first average voltage pressure difference, determine the first difference;

[0019] Judge whether the first difference is greater than 0; in the case where the first difference is greater than 0, further judge whether the second average voltage pressure difference is within the threshold range;

[0020] Determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to whether the second average voltage pressure difference is within the threshold range.

[0021] According to the method for detecting the blockage of the formation negative pressure pipeline provided by the present invention, the first detection point is set on the formation voltage curve corresponding to the battery capacity of the first formation cell reaching 3%-4%; the second detection point is set on the formation voltage curve corresponding to the battery capacity of the first formation cell reaching 8%-10%.

[0022] According to the method for detecting the blockage of the formation negative pressure pipeline provided by the present invention, it further includes a third detection point; the third detection point is set between the first detection point and the second detection point; the third detection point corresponds to a third detection voltage and an average voltage of the third detection point;

[0023] The step 42 further includes:

[0024] Based on the second average voltage difference and the third average voltage difference, determine a second difference; based on the third average voltage difference and the first average voltage difference, determine a third difference;

[0025] Judge whether both the second difference and the third difference are greater than 0;

[0026] In the case where both the second difference and the third difference are greater than 0, determine whether the negative pressure pipeline of the corresponding cell is blocked according to whether the second average voltage difference is within the threshold range.

[0027] According to the method for detecting the blockage of the formation negative pressure pipeline provided by the present invention, during the formation process of each of the first formation cells, before the battery capacity reaches 10%, draw the formation voltage curve corresponding to each first formation cell.

[0028] According to the method for detecting the blockage of the formation negative pressure pipeline provided by the present invention, the threshold range is [a first threshold, a second threshold];

[0029] The acquisition of the first threshold includes:

[0030] According to a preset frequency, obtain the fourth average voltage difference corresponding to all normal cells in the formation cabinet within a preset time period; from all the fourth average voltage differences, select the average voltage difference corresponding to the largest value as the first target average voltage difference;

[0031] Take the sum of the first target average voltage difference and a preset value as the first threshold;

[0032] The acquisition of the second threshold includes;

[0033] According to the preset frequency, obtain the fifth average voltage difference corresponding to all blockages in the blocked formation cabinet; at least one channel of the cells in the blocked formation cabinet is blocked;

[0034] From all the fifth average voltage differences, select the average voltage difference corresponding to the largest value as the second target average voltage difference;

[0035] Take the sum of the second target average voltage difference and the preset value as the second threshold.

[0036] The present invention also provides a negative pressure pipeline blockage detection device, including:

[0037] A plotting unit for plotting the formation voltage curve corresponding to each first formation cell in the formation cabinet;

[0038] A setting unit for setting at least one detection point on each of the formation voltage curves;

[0039] An acquisition unit for acquiring the detection voltage and the average detection point voltage corresponding to each detection point;

[0040] A determination unit for determining the blockage condition of the negative pressure pipeline of the corresponding cell according to the detection voltage and the average detection point voltage.

[0041] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method for detecting blockage of the formation negative pressure pipeline as described in any one of the above is implemented.

[0042] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method for detecting blockage of the formation negative pressure pipeline as described in any one of the above is implemented.

[0043] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, the method for detecting blockage of the formation negative pressure pipeline as described in any one of the above is implemented.

[0044] The method, device, and equipment for detecting blockage of the formation negative pressure pipeline provided by the present invention determine the blockage condition of the negative pressure pipeline of the corresponding cell by setting detection points on the formation voltage curve corresponding to the cell and according to the detection voltage and the average detection point voltage of the detection points, which not only improves the detection efficiency and accuracy, but also reduces the detection cost. Description of the Drawings

[0045] Figure 1 It is one of the schematic flowcharts of the method for detecting blockage of the formation negative pressure pipeline provided by the present invention;

[0046] Figure 2 It is the second schematic flowchart of the method for detecting blockage of the formation negative pressure pipeline provided by the present invention;

[0047] Figure 3Schematic diagram of the formation voltage curve of the normalization forming cabinet provided by the embodiment of the present invention;

[0048] Figure 4 is Figure 3 partial enlarged view of;

[0049] Figure 5 Schematic diagram of the formation voltage curve of the forming cabinet with a single-channel blockage provided by the embodiment of the present invention;

[0050] Figure 6 is Figure 5 partial enlarged view of;

[0051] Figure 7 Schematic diagram of the formation voltage curve corresponding to the abnormal exit board;

[0052] Figure 8 Structural block diagram of the negative pressure pipeline blockage detection device provided by the present invention;

[0053] Figure 9 Schematic diagram of the structure of the electronic device provided by the present invention. Detailed implementation manners

[0054] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0055] Figure 1 One of the schematic diagrams of the method flow for detecting blockage of the formation negative pressure pipeline provided by the present invention, as Figure 1 shown, the method includes:

[0056] Step 1: Draw the formation voltage curve corresponding to each first formation battery cell in the formation cabinet;

[0057] Specifically, the so-called formation voltage curve is a graph showing the change of voltage with time when the battery is charged and discharged cyclically under certain conditions (such as temperature, current, voltage, etc.). Assuming there are N first formation battery cells in a formation cabinet, then there are N corresponding formation voltage curves.

[0058] The so-called first-generated battery cell refers to the battery cell that is first-generated, not the retested battery cell. The object of detection of the present invention is only applicable to the first-generated battery cell, but not to the retested battery cell. The reason is that the detection voltage of the retested battery cell is not at the same level. For example, the voltage of some retested battery cells is 100, and that of some is 3000. Then the average voltage of the detection point of the retested battery cell will be pulled up, so that the pulled-up average voltage of the detection point will not meet the condition within the threshold range, resulting in missed judgment and misjudgment.

[0059] Step 2: Set at least one detection point on each formation voltage curve.

[0060] Specifically, the detection point is in the formation voltage curve, where the horizontal axis represents the formation time and the vertical axis represents the formation voltage.

[0061] Step 3: Obtain the detection voltage corresponding to each detection point and the average voltage of the detection point.

[0062] Specifically, the detection voltage corresponding to each detection point is obtained by collecting the voltage sensor provided by the formation equipment. Since the detection of the cell voltage is based on the voltage of the cell collected by the voltage sensor, and the voltage sensor comes from the device provided by the charging and discharging equipment itself, no additional equipment is required. Therefore, the defect of high cost caused by adding a flow detector or a liquid level sensor to the negative pressure pipeline in the prior art is avoided, so that the blockage of the negative pressure pipeline can be found in a short time, and measures can be taken in time to clear or repair it, avoiding the further deterioration of the blockage problem of the negative pressure pipeline; in addition, it also avoids the defect of long time and low detection efficiency caused by using tooling to perform flow testing on the formation cabinet.

[0063] The average voltage at the detection point is calculated as follows:

[0064] (1)

[0065] Represents the average voltage at the detection point, It indicates the total voltage of all cells in the formation cabinet detected at the same time as the detection point. Indicates the total voltage of all NG cells in the formation cabinet; Indicates the minimum voltage value detected at the same time as the detection point; Indicates the maximum voltage value detected at the same time as the detection point; Indicates the total number of cells in the formation cabinet; Indicates the total number of unqualified cells. Among them, unqualified cells can be determined by the program carried by the upper computer of the formation cabinet. The total number of cells is determined according to the actual situation. Different formation cabinets contain different total numbers of cells.

[0066] Step 4: Determine the clogging condition of the negative pressure pipeline of the corresponding battery cell according to the detected voltage and the average voltage of the detection point.

[0067] Specifically, the average voltage of the detection point reflects the comprehensive performance of the voltage levels of all battery cells in the formation cabinet at a certain stage of battery cell formation, and has important reference value for evaluating the stability and consistency of the battery cell formation process. The detected voltage is the voltage value detected for a certain battery cell at a certain moment. Therefore, based on the detected voltage and the average voltage of the detection point, the present invention determines the clogging condition of the negative pressure pipeline of the corresponding battery cell, which can effectively improve the detection accuracy.

[0068] In an embodiment of the present invention, in a formation cabinet, there are N battery cells in total, and each battery cell is equipped with a negative pressure pipeline branch, with a total of N negative pressure pipeline branches. These N negative pressure pipeline branches are finally aggregated through the negative pressure pipeline main pipe. Among them, each battery cell corresponds to a formation voltage curve, and there are a total of N formation voltage curves for N battery cells. At least 1 detection point is set on the formation voltage curve corresponding to each battery cell. The clogging condition of the negative pressure pipeline of the corresponding battery cell is determined through the detected voltage and the average voltage of the detection point.

[0069] The method, device and equipment for detecting the clogging of the formation negative pressure pipeline provided by the present invention set detection points on the formation voltage curve corresponding to the battery cell, and determine the clogging condition of the negative pressure pipeline of the corresponding battery cell according to the detected voltage and the average voltage of the detection point, which not only improves the detection efficiency and accuracy, but also reduces the detection cost.

[0070] Further, the solution corresponding to Step 4 is further explained below. This Step 4 includes the following steps:

[0071] Step 41: Determine the average voltage pressure difference of the detection point based on the detected voltage of each detection point and the average voltage of the detection point;

[0072] Step 42: Determine the clogging condition of the negative pressure pipeline of the corresponding battery cell according to whether the average voltage pressure difference of the detection point is within the threshold range.

[0073] Specifically, the average voltage pressure difference of the detection point is calculated according to the following formula:

[0074] (2)

[0075] Among them, Represents the detection voltage corresponding to the detection point. That is: the average voltage difference of the detection point = the voltage of the detection point - the average voltage of the detection point. During the formation process of the lithium battery, the negative pressure pipeline is responsible for extracting the gas generated during the chemical reaction inside the battery. Chemical reactions occur inside the battery and generate gas. If the negative pressure pipeline is blocked, these gases cannot be effectively discharged and will accumulate inside the battery. When a large amount of gas accumulates inside the battery, these gases will occupy the space inside the battery, resulting in a reduction in the volume of the electrolyte, which in turn affects the transmission of lithium ions. At the same time, the presence of gas on the electrode plate will hinder the lithium ion insertion process. Due to the gas hindering the lithium ion insertion, lithium ions on the negative electrode may not be able to be inserted normally and will precipitate metallic lithium on the surface of the negative electrode. As lithium ions accumulate on the surface of the negative electrode, a barrier that hinders further lithium ion insertion will be formed, which is equivalent to increasing the internal resistance of the battery. The increase in internal resistance will cause the voltage of the battery cell to rise, and when the voltage of the battery cell rises, the average voltage difference of the detection point will also rise accordingly. Therefore, if the average voltage difference of this detection point rises to within the threshold range, it can be determined that the negative pressure pipeline corresponding to this battery cell may be blocked.

[0076] The determination condition for the present invention to determine the blockage situation of the negative pressure pipeline of a certain battery cell is: set a detection point on the formation voltage curve corresponding to this battery cell, and determine whether the average voltage difference of this detection point is within this threshold range. If the average voltage difference of this detection point is within this threshold range, it means that the negative pressure pipeline corresponding to this battery cell is blocked.

[0077] The method for detecting the blockage of the formation negative pressure pipeline provided by the present invention, on the one hand, by drawing the formation voltage curve corresponding to the first formation battery cell and using whether the average voltage difference of the detection point on this formation voltage curve is within the threshold range to judge the blockage situation of the negative pressure pipeline of the corresponding battery cell. For the operator, the judgment is more intuitive. Therefore, the detection efficiency is improved and the detection cost is reduced; on the other hand, by determining whether the average voltage difference of the detection point is within the threshold range to determine whether the negative pressure pipeline of the corresponding battery cell is blocked, the detection accuracy is effectively improved.

[0078] Further, Figure 2 This is the second schematic diagram of the method flow for detecting the blockage of the formation negative pressure pipeline provided by the present invention. As Figure 2 shown, in order to improve the detection accuracy in the embodiment of the present invention, 2 detection points are set on the formation voltage curve to judge the blockage situation of the negative pressure pipeline of the corresponding battery cell. The specific implementation method is as follows:

[0079] Step 201: Set 2 detection points on each formation voltage curve, namely the first detection point and the second detection point; the first detection point and the second detection point are set in the order of increasing time;

[0080] Step 202: Obtain the first detection voltage and the average voltage of the first detection point corresponding to the first detection point, and the second detection voltage and the average voltage of the second detection point corresponding to the second detection point, respectively;

[0081] Step 203: Determine the first average voltage pressure difference based on the first detection voltage and the average voltage of the first detection point; determine the second average voltage pressure difference according to the second detection voltage and the average voltage of the second detection point;

[0082] Step 204: Determine the first difference based on the second average voltage pressure difference and the first average voltage pressure difference;

[0083] Step 205: Determine whether the first difference is greater than 0; in the case where the first difference is greater than 0, further determine whether the second average voltage pressure difference is within the threshold range;

[0084] Step 206: In the case where the second average voltage pressure difference is within the threshold range, determine that there is a blockage in the negative pressure pipeline of the corresponding battery cell.

[0085] Specifically, even when the average voltage pressure difference of a certain detection point is within the threshold range, it is not necessarily caused by a blockage in the negative pressure pipeline. It may also be caused by other reasons, such as: defects inside the battery cell, uneven electrolyte, poor contact of the electrode plate, etc. Only when the average voltage pressure difference increases, it is possible that the negative pressure pipeline of the battery cell is blocked. Therefore, the present invention needs to calculate the difference between the second average voltage pressure difference and the first average voltage pressure difference, that is, the first difference. In the case where the first difference is greater than 0, it indicates that the average voltage pressure difference of the battery cell increases, so as to determine that there is a blockage in the negative pressure pipeline of the corresponding battery cell. Therefore, before determining whether the second average voltage pressure difference is within the threshold range, the present invention first needs to determine whether the first difference is greater than 0, so as to further narrow the judgment range and improve the judgment accuracy and efficiency.

[0086] The method for detecting blockage of the formation negative pressure pipeline provided by the present invention sets the first detection point and the second detection point in a time-increasing manner, and uses the first difference being greater than 0 and the second average voltage pressure difference being within the threshold range to determine that there is a blockage in the negative pressure pipeline of the corresponding battery cell, which effectively improves the detection accuracy and efficiency.

[0087] Further, during the formation process of each first-formed battery cell, before the battery capacity reaches 10%, draw the formation voltage curve corresponding to each first-formed battery cell.

[0088] Specifically, during the formation process of the first formed battery cell, gas is generated before the battery capacity reaches 10%. After the gas generation stage, no more gas is generated. Therefore, before the battery capacity reaches 10%, the average voltage difference across the blocked battery cell gradually increases. When the battery capacity exceeds 10% SOC, even if there is a blockage in the negative pressure pipeline, it is impossible to detect whether the average voltage difference at the detection point is within the threshold range through detection. Therefore, in order to further improve the detection accuracy, during the first 10% SOC process of each first formed battery cell formation, the formation voltage curve of the first formed battery cell is plotted, and detection points are set on this formation voltage curve to improve the detection accuracy.

[0089] Further, the first detection point is set on the formation voltage curve corresponding to the battery capacity of the first formed battery cell reaching 3% - 4%; the second detection point is set on the formation voltage curve corresponding to the battery capacity of the first formed battery cell reaching 8% - 10%.

[0090] Specifically, the embodiment of the present invention provides a method for setting detection points. Among them, the first detection point is set on the formation voltage curve corresponding to the battery capacity of the first formed battery cell reaching 3% - 4%, preferably 3% SOC; the second detection point is set on the formation voltage curve corresponding to the battery capacity of the first formed battery cell reaching 8% - 10%, preferably 10% SOC. This is because when the formation process of the battery reaches more than 3%, lithium deposition reaction starts inside the battery cell, the internal resistance starts to increase, and the average voltage difference across the detection point starts to rise. If the detection point is set on the formation voltage curve where the battery capacity does not reach 3%, the sign of the increasing average voltage difference cannot be detected. When the battery capacity reaches 10% or more, even if there is a blockage in the negative pressure pipeline, the average voltage difference across the detection point gradually decreases and falls outside the threshold, resulting in missed detection. Therefore, in order to further improve the detection accuracy, the embodiment of the present invention sets the first detection point and the second detection point near the battery capacity of 3% and 10% of the battery cell respectively.

[0091] Further, in the embodiment of the present invention, there are 3 detection points set on the formation voltage curve, namely the first detection point, the second detection point, and the third detection point. Among them, the third detection point is set between the first detection point and the second detection point; and the first detection point, the third detection point, and the second detection point are set in the order of increasing time. Among them, the third detection point corresponds to the third detection voltage and the average voltage at the third detection point. Based on the difference between the third detection voltage and the average voltage at the third detection point, the third average voltage difference is obtained. In order to determine whether there is a blockage in the negative pressure pipeline of the corresponding battery cell according to these 3 detection points, the present invention provides the following solution:

[0092] First, based on the second average voltage difference and the third average voltage difference, determine the second difference; based on the third average voltage difference and the first average voltage difference, determine the third difference. Secondly, determine whether both the second difference and the third difference are greater than 0. When both the second difference and the third difference are greater than 0, further determine whether the negative pressure pipeline of the corresponding battery cell is blocked according to whether the second average voltage difference is within the threshold range.

[0093] Specifically, in the embodiment of the present invention, by setting three detection points (the first detection point, the second detection point, and the third detection point), and by simultaneously determining whether both the second difference and the third difference are greater than 0, it is determined whether the first average voltage difference, the third average voltage difference, and the second average voltage difference are in an increasing state on the formation curve. This dual judgment condition can more reliably identify abnormal changes in the voltage curve and reduce the possibility of misjudgment. At the same time, the present invention uses the second average voltage difference to determine whether the negative pressure pipeline of the corresponding battery cell is blocked, rather than using the third average voltage difference to determine whether the negative pressure pipeline of the corresponding battery cell is blocked, because the second detection point is near 10% SOC, which can effectively determine whether there is a blockage; while using the third detection point to judge, because its position is not near 10% SOC, there may be a possibility of missed judgment. Therefore, the present application determines whether the negative pressure pipeline of the corresponding battery cell is blocked through the second average voltage difference, which can further improve the accuracy of judging the blockage of the negative pressure pipeline of the battery cell.

[0094] In addition, for the third detection point, as long as it is ensured to be between the first detection point and the second detection point, the present application does not make a specific limitation on its specific position.

[0095] Figure 3 Schematic diagram of the formation voltage curve of a normal formation cabinet provided by the embodiment of the present invention; Figure 4 is Figure 3 a partial enlarged view of; from Figure 3 , Figure 4 it can be seen that since all the battery cells in the formation cabinet are in a normal state and there is no blockage, the formation voltage curves of all battery cells tend to coincide and basically appear as a thick curve in the figure. Figure 5 Schematic diagram of the formation voltage curve of a formation cabinet with a single-channel blockage provided by the embodiment of the present invention; Figure 6 is Figure 5 a partial enlarged view of; three detection points are set on the curve, namely detection point 1, detection point 2, and detection point 3. It can be seen from the figure that the curve pointed to by detection point 2 deviates from other curves, and thus it can be judged that the negative pressure pipeline of the battery cell corresponding to the deviated curve is blocked. Figure 7 Schematic diagram of the formation voltage curve corresponding to the abnormal exit board, as Figure 7As shown, when an abnormal exit plate occurs, the formation voltage curve corresponding to the battery cell will deviate from the very beginning. If the deviation is caused by a blockage in a single channel ( Figure 6 ), the deviation will occur after a certain delay after the start of formation. Therefore, for some cases of negative pressure pipeline blockage, by using the formation voltage curve, it is possible to intuitively see which battery cell is abnormal. For some abnormal battery cells, further calculations at the detection points are required for accurate judgment. For example, when the average voltage difference exceeds a certain upper threshold, since it is not obvious enough on the curve and if directly observed on the formation voltage curve, misjudgment may occur. Therefore, in this application, by setting detection points on the formation voltage curve for further judgment, the accuracy and efficiency of detection can be effectively improved.

[0096] Further, it is determined whether the average voltage difference at the detection point is within the threshold range, where the threshold range is [the first threshold, the second threshold].

[0097] The acquisition of the first threshold includes:

[0098] At a preset frequency, obtain the fourth average voltage difference corresponding to all normal battery cells in the formation cabinet within a preset time period; from all the fourth average voltage differences, select the average voltage difference corresponding to the largest value as the first target average voltage difference; and take the sum of the first target average voltage difference and a preset value as the first threshold.

[0099] In the embodiment of the present invention, the preset value is comprehensively determined according to factors such as the number of battery cells in the actual formation cabinet and formation parameters.

[0100] For example, assume that the preset time period is 1 hour, the preset frequency is 1 time / s, the preset value is 5V, and there are 30 battery cells in a formation cabinet. Then the acquisition method of the first threshold is as follows:

[0101] (1) According to formula (2), obtain the average voltage difference obtained from the first detection of all battery cells in the formation cabinet. Then, for the first detection, there are 30 battery cells, corresponding to 30 average voltage differences; within 1 hour, there are 3600 * 30 average voltage differences;

[0102] (2) From the 3600 * 30 average voltage differences, select the average voltage difference corresponding to the largest value as the maximum average voltage difference of the normal formation cabinet, that is, the first target average voltage difference;

[0103] (3) Take the final voltage value obtained by adding 5V to the first target average voltage difference as the first threshold;

[0104] Next, the acquisition method of the second threshold is introduced, which specifically includes the following steps:

[0105] Obtain the fifth average voltage difference corresponding to all blocked battery cells in the blocked formation cabinet within the above preset time period according to the above preset frequency; there is a blockage in the channels of at least one battery cell in the blocked formation cabinet; from all the fifth average voltage differences, select the average voltage difference corresponding to the largest value as the second target average voltage difference; use the sum of the second target average voltage difference and the preset value as the second threshold.

[0106] For example, assume that the preset time period is 1 hour, the preset frequency is 1 time / s, the preset value is 5V, and there are 30 battery cells in a blocked formation cabinet, and the channel of one of the battery cells is blocked, which is called the blocked battery cell. Then the method for obtaining the second threshold is as follows:

[0107] Obtain the average voltage difference detected for the blocked battery cell at the 1st second according to formula (2). Then, within 1 hour, there are 3600 average voltage differences corresponding to this blocked battery cell. Select the largest average voltage difference corresponding to the blocked battery cell from these 3600 average voltage differences as the second target average voltage difference; use the final voltage value obtained by adding 5V to the second target average voltage difference as the second threshold.

[0108] Taking the above example as an example again, assume that there are 30 battery cells in a blocked formation cabinet, and the channels of 2 of the battery cells are blocked. Then, at the 1st second of detection, the average voltage differences corresponding to these 2 blocked battery cells are obtained respectively. Then, within 1 hour, there are 2 * 3600 average voltage differences corresponding to the 2 blocked battery cells. Select the average voltage difference corresponding to the largest value from these 2 * 3600 average voltage differences as the second target average voltage difference; and use the final voltage value obtained by adding 5V to this second target average voltage difference as the second threshold.

[0109] During the process of obtaining the first threshold of this application, the battery cells in the formation cabinet are all normal battery cells. In this application, a preset value is added to the first target average voltage difference to form the first threshold, so that while the threshold for detecting the blockage of the negative pressure pipeline is close to the lower limit, a certain tolerance range (preset value) is allowed, thereby preventing misjudgment caused by voltage detection fluctuations of the equipment while ensuring the detection accuracy. Therefore, to a certain extent, the detection accuracy is improved; on the other hand, during the acquisition of the second threshold, there is at least one battery cell in the formation cabinet whose channel is blocked. What this application obtains is the average voltage difference corresponding to the blocked battery cell, rather than the average voltage difference corresponding to the normal battery cells in the blocked formation cabinet. In this way, it can be ensured that the acquisition of the second threshold is only for the blocked battery cells, thereby effectively improving the accuracy of the threshold and further improving the detection accuracy.

[0110] In the embodiments of the present invention, it is preferable to calculate the maximum value of the average voltage difference of the blocked formation cabinet when only one negative pressure pipeline in the formation cabinet is blocked. This is because if the number of blocked battery cells is too large, the value of the average voltage difference will be increased, which will cause the maximum value of the average voltage difference of the blocked formation cabinet to deviate from the normal range, and instead reduce the detection accuracy.

[0111] The negative pressure pipeline blockage detection device provided by the present invention will be described below. The negative pressure pipeline blockage detection device described below can be correspondingly referred to the method for detecting the blockage of the formation negative pressure pipeline described above.

[0112] Figure 8 is a structural block diagram of the negative pressure pipeline blockage detection device provided by the present invention, as Figure 8 shown. The device includes:

[0113] A drawing unit 801, configured to draw a formation voltage curve corresponding to each battery cell in the formation cabinet;

[0114] A setting unit 802, configured to set at least one detection point on each of the formation voltage curves;

[0115] An acquisition unit 803: configured to acquire the detection voltage and the average detection point voltage corresponding to each detection point;

[0116] A determination unit 804: configured to determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average detection point voltage.

[0117] Figure 9 Illustrates a schematic physical structure diagram of an electronic device, as Figure 9 shown. The electronic device may include: a processor 910, a communication interface 920, a memory 930, and a communication bus 940. Among them, the processor 910, the communication interface 920, and the memory 930 communicate with each other through the communication bus 940. The processor 910 can call the logical instructions in the memory 930 to execute the method for detecting the blockage of the formation negative pressure pipeline. The method includes:

[0118] Step 1: Draw a formation voltage curve corresponding to each first-formation battery cell in the formation cabinet;

[0119] Step 2: Set at least one detection point on each formation voltage curve;

[0120] Step 3: Acquire the detection voltage and the average detection point voltage corresponding to each detection point;

[0121] Step 4: Determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average detection point voltage.

[0122] In addition, when the logical instructions in the above-mentioned memory 930 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories, random access memories, magnetic disks, or optical discs that can store program codes.

[0123] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the method for detecting the blockage of the negative pressure pipeline provided by the above-mentioned various methods. The method includes:

[0124] Step 1: Draw the formation voltage curve corresponding to each first-formed battery cell in the formation cabinet;

[0125] Step 2: Set at least one detection point on each formation voltage curve;

[0126] Step 3: Obtain the detection voltage and the average detection point voltage corresponding to each detection point;

[0127] Step 4: Determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average detection point voltage.

[0128] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the method for detecting the blockage of the negative pressure pipeline provided by the above-mentioned various methods. The method includes:

[0129] Step 1: Draw the formation voltage curve corresponding to each first-formed battery cell in the formation cabinet;

[0130] Step 2: Set at least one detection point on each formation voltage curve;

[0131] Step 3: Obtain the detection voltage and the average detection point voltage corresponding to each detection point;

[0132] Step 4: Determine the blockage condition of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average detection point voltage.

[0133] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative effort.

[0134] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting blockage of a negative pressure pipeline, characterized in that: include: Step 1: Draw the formation voltage curve corresponding to each first-formed cell in the formation cabinet; Step 2: setting at least one detection point on each of the formation voltage curves; Step 3: Obtain the detection voltage corresponding to each detection point and the average voltage of the detection point; Step 4: Determine the blockage of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average voltage of the detection point; The fourth step comprises: Step 41: determining an average voltage difference of the detection point based on the detection voltage of each detection point and the average voltage of the detection point; Step 42: determining the blockage of the negative pressure pipeline of the corresponding battery cell according to whether the average voltage difference of the detection point is within a certain threshold range; On each of the formation voltage curves, two detection points are set, namely a first detection point and a second detection point; the first detection point and the second detection point are set in a time-increasing manner; The first detection point corresponds to a first detection voltage and an average voltage of the first detection point; the second detection point corresponds to a second detection voltage and an average voltage of the second detection point; The step 41 comprises: determining a first average voltage difference according to the first detection voltage and the first detection point average voltage; determining a second average voltage difference according to the second detection voltage and the second detection point average voltage; The step 42 further comprises: determining a first difference value based on the second average voltage difference and the first average voltage difference; Determine whether the first difference is greater than 0; if the first difference is greater than 0, further determine whether the second average voltage difference is within the threshold range; The blockage status of the negative pressure line of the corresponding battery cell is determined according to whether the second average voltage difference is within the threshold range.

2. The method for detecting blockage of a formation negative pressure pipeline according to claim 1, characterized in that: The first detection point is set on the formation voltage curve corresponding to when the battery capacity of the first formed cell reaches 3%-4%; the second detection point is set on the formation voltage curve corresponding to when the battery capacity of the first formed cell reaches 8%-10%.

3. The method for detecting blockage of a formation negative pressure pipeline according to claim 2, characterized in that: Also includes a third detection point; the third detection point is arranged between the first detection point and the second detection point; The third detection point corresponds to a third detection voltage and an average voltage of the third detection point; The step 42 comprises: Determine a second difference based on the second average voltage difference and the third average voltage difference; determine a third difference based on the third average voltage difference and the first average voltage difference; Determine whether the second difference and the third difference are both greater than 0; When the second difference and the third difference are both greater than 0, the blockage of the negative pressure pipeline of the corresponding battery cell is determined according to whether the second average voltage difference is within the threshold range.

4. The method for detecting blockage of a negative pressure formation pipeline according to any one of claims 1 to 3, characterized in that: During the formation process of each of the first-formed cells, before the battery capacity reaches 10%, a formation voltage curve corresponding to each first-formed cell is drawn.

5. The method for detecting blockage of a negative pressure formation pipeline according to any one of claims 1-2, characterized in that: The threshold range is [first threshold, second threshold]; The obtaining of the first threshold comprises: According to a preset frequency, obtain the fourth average voltage difference corresponding to all normal cells in the formation cabinet within a preset time period; from all the fourth average voltage differences, select the average voltage difference corresponding to the maximum value as the first target average voltage difference; The sum of the first target average voltage difference and a preset value is used as the first threshold; The acquisition of the second threshold comprises: According to the preset frequency, a fifth average voltage difference corresponding to all blocked cells in the blocked formation cabinet within the preset time period is obtained; a channel of at least one cell in the blocked formation cabinet is blocked; a channel corresponding to a cell is blocked, and it is called a blocked cell; From all the fifth average voltage differences, select the average voltage difference corresponding to the maximum value as the second target average voltage difference; The sum of the second target average voltage difference and the preset value is used as the second threshold.

6. A device for executing the method for detecting blockage of a negative pressure formation pipeline according to claim 1, characterized in that: include: A drawing unit, used for drawing a formation voltage curve corresponding to each first-formed cell in the formation cabinet; A setting unit, used for setting at least one detection point on each of the formation voltage curves; Acquisition unit: used to acquire the detection voltage corresponding to each detection point and the average voltage of the detection point; Determining unit: used to determine the blockage status of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average voltage of the detection point.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for detecting blockage of a negative pressure pipeline as described in any one of claims 1 to 5 is implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for detecting blockage of a negative pressure pipeline as described in any one of claims 1 to 5 is implemented.

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