Method, device and equipment for detecting blockage of formation negative pressure pipeline

Abstract

The invention relates to the technical field of batteries. The invention provides a method, a device and equipment for detecting blockage of a formation negative pressure pipeline. The method comprises the following steps: drawing a formation voltage curve corresponding to each first formation cell in a formation cabinet; at least one detection point is arranged on each formation voltage curve; acquiring a detection voltage corresponding to each detection point and a detection point average voltage; and according to the detection voltage and the average voltage of the detection points, determining the negative pressure pipeline blockage condition of the corresponding battery cell. According to the method provided by the invention, the detection point is arranged on the formation voltage curve corresponding to the battery cell, and the negative pressure pipeline blockage condition of the corresponding battery cell is determined according to the detection voltage of the detection point and the average voltage of the detection point, so that the detection efficiency and precision are improved, and the detection cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method, a device and equipment for detecting 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 vital role, which is directly related to the stability and safety of battery performance. Formation refers to the first charging of a newly produced battery to cause a chemical reaction in its electrode materials to form a stable electrode structure and performance. The main goal of this process is to form a stable solid electrolyte interface (SEI) film and activate the battery cell, 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 by the decomposition of the electrolyte or other side reactions during the formation process, prevent these gases from being adsorbed on the surface of the electrode, and thus avoid the formation of "dead lithium". Once "dead lithium" is generated, it will not be consumed through conventional charge and discharge cycles, but will continue to accumulate during the charge and discharge process and gradually grow into lithium dendrites. The growth of lithium dendrites may pierce the battery separator, causing a short circuit inside the battery cell, thereby causing 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: first, directly install a flow detector or a liquid level sensor in the negative pressure pipeline to monitor the gas flow; second, regularly use the tooling to perform flow testing. For the blockage detection of the negative pressure pipeline in the warehouse, the specific method is to place the tooling in the warehouse, and after the cylinder is closed, the negative pressure is pumped on the tooling. The digital flow meter on the tooling transmits the collected flow data to the host computer through the communication network port for analysis. However, both methods have certain limitations in practical applications. First, for the blockage detection of the formation negative pressure pipeline, if each negative pressure pipeline is equipped with a flow detector or a liquid level sensor, given that one pipeline corresponds to one battery core, this will result in extremely high hardware costs. In addition, considering that the formation room is mostly a high temperature environment, the maintenance cost of the sensor is also relatively high. Secondly, although it is feasible to blindly use tooling to perform flow testing on the formation cabinet, the test process is time-consuming and requires a lot of manpower, resulting in low detection efficiency.

[0004] Therefore, in view of the high cost and low efficiency of the existing technology in detecting negative pressure pipeline blockage, it is necessary to develop a more economical, efficient and large-scale production line-suitable method for detecting negative pressure pipeline blockage 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 blockage of a formation negative pressure pipeline, so as to solve the defects of high cost and low efficiency of negative pressure pipeline blockage detection in the prior art and realize economical and efficient detection.

[0006] The present invention provides a method for detecting blockage of a negative pressure pipeline, comprising: 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 status of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average voltage of the detection point.

[0007] According to the method for detecting blockage of a negative pressure pipeline provided by the present invention, the step 4 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: Determine the blockage status of the negative pressure pipeline of the corresponding battery cell according to whether the average voltage difference of the detection point is within a threshold range.

[0008] According to the method for detecting blockage of a formation negative pressure pipeline provided by the present invention, two detection points are set on each of the formation voltage curves, 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 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.

[0009] According to the method for detecting blockage of a formation negative pressure pipeline provided by the present invention, 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%.

[0010] The method for detecting blockage of a negative pressure pipeline provided by the present invention further 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 further 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, it is determined whether the negative pressure line of the corresponding battery cell is blocked according to whether the second average voltage difference is within the threshold range.

[0011] According to the method for detecting blockage of a formation negative pressure pipeline provided by the present invention, during the formation process of each first-formed battery cell, before the battery capacity reaches 10%, a formation voltage curve corresponding to each first-formed battery cell is drawn.

[0012] According to the method for detecting blockage of a negative pressure pipeline provided by the present invention, 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 blockages in the blocked forming cabinet within the preset time period is obtained; a channel of at least one battery cell in the blocked forming cabinet is blocked; 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.

[0013] The present invention also provides a negative pressure pipeline blockage detection device, comprising: 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.

[0014] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for detecting blockage of a negative pressure pipeline as described in any one of the above is implemented.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for detecting blockage of a negative pressure pipeline.

[0016] The present invention also provides a computer program product, comprising a computer program, wherein 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 the above is implemented.

[0017] The method, device and equipment for detecting blockage of a formation negative pressure pipeline provided by the present invention not only improve the efficiency and accuracy of detection, but also reduce the detection cost by setting a detection point on the formation voltage curve corresponding to the battery cell and determining the blockage of the negative pressure pipeline of the corresponding battery cell according to the detection voltage of the detection point and the average voltage of the detection point. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 One of the flow charts of the method for detecting blockage of a negative pressure pipeline provided by the present invention; Figure 2 A second flow chart of the method for detecting blockage of a negative pressure pipeline provided by the present invention; Figure 3 A schematic diagram of a forming voltage curve of a normal forming cabinet provided in an embodiment of the present invention; Figure 4 for Figure 3 A partial enlarged view of Figure 5 A schematic diagram of a forming voltage curve of a forming cabinet with a single channel blocked provided by an embodiment of the present invention; Figure 6 for Figure 5 A partial enlarged view of Figure 7 It is a schematic diagram of the formation voltage curve corresponding to the abnormality of the exit plate; Figure 8 This is a structural block diagram of the negative pressure pipeline blockage detection device provided by the present invention; Fig. 9 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Figure 1 One of the flow charts of the method for detecting blockage of a negative pressure pipeline provided by the present invention is as follows: Figure 1 As shown, the method includes: Step 1: Draw the formation voltage curve corresponding to each first-formed cell in the formation cabinet; Specifically, the so-called formation voltage curve is a curve graph of the voltage change over time when the battery is charged and discharged under certain conditions (such as temperature, current, voltage, etc.). Assuming that there are N first-formed cells in a formation cabinet, there are N corresponding formation voltage curves.

[0021] 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.

[0022] Step 2: Set at least one detection point on each formation voltage curve.

[0023] 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.

[0024] Step 3: Obtain the detection voltage corresponding to each detection point and the average voltage of the detection point.

[0025] 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.

[0026] The average voltage at the detection point is calculated as follows: (1) 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.

[0027] Step 4: Determine the blockage of the negative pressure pipeline of the corresponding battery cell based on the detection voltage and the average voltage of the detection point.

[0028] Specifically, the average voltage at the detection point reflects the comprehensive performance of the voltage levels of all cells in the formation cabinet at a certain stage of the cell formation, which has important reference value for evaluating the stability and consistency of the cell formation process. The detection voltage is the voltage value detected by a certain cell at a certain moment. Therefore, the present invention can effectively improve the detection accuracy by judging the blockage of the negative pressure pipeline of the corresponding cell based on the detection voltage and the average voltage at the detection point.

[0029] In one embodiment of the present invention, there are N battery cells in a formation cabinet, each battery cell is equipped with a negative pressure pipeline branch, a total of N negative pressure pipeline branches, and the N negative pressure pipeline branches are finally summarized through the negative pressure pipeline main pipe. Among them, each battery cell corresponds to a formation voltage curve, and N battery cells have a total of N formation voltage curves. At least one detection point is set on the formation voltage curve corresponding to each battery cell. The blockage of the negative pressure pipeline of the corresponding battery cell is determined by the detection voltage of the detection point and the average voltage of the detection point.

[0030] The method, device and equipment for detecting blockage of a formation negative pressure pipeline provided by the present invention not only improve the efficiency and accuracy of detection, but also reduce the detection cost by setting a detection point on the formation voltage curve corresponding to the battery cell and determining the blockage of the negative pressure pipeline of the corresponding battery cell according to the detection voltage of the detection point and the average voltage of the detection point.

[0031] Furthermore, the solution corresponding to step 4 is further explained below, and step 4 includes the following steps: 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: Determine the blockage status of the negative pressure pipeline of the corresponding battery cell according to whether the average voltage difference of the detection point is within a threshold range.

[0032] Specifically, the average voltage difference at the detection point Calculated according to the following formula: (2) in, Indicates 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 pipe is responsible for extracting the gas generated in the chemical reaction process inside the battery. Chemical reactions will occur inside the battery and produce gas. If the negative pressure pipe is blocked, these gases will not 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 will hinder the embedding process of lithium ions. Since the gas hinders the embedding of lithium ions, the lithium ions on the negative electrode may not be embedded normally, and then metallic lithium will be precipitated on the surface of the negative electrode. As lithium ions accumulate on the surface of the negative electrode, a barrier will be formed to hinder the further embedding of lithium ions, which is equivalent to increasing the internal resistance of the battery. The increase in internal resistance will lead to an increase in the voltage of the battery cell, and as the voltage of the battery cell increases, the average voltage difference of the detection point will also increase accordingly. Therefore, if the average voltage difference at the detection point rises to within the threshold range, it can be determined that the negative pressure pipeline corresponding to the battery cell may be blocked.

[0033] The present invention provides a condition for determining whether a negative pressure pipeline of a certain battery cell is blocked as follows: a detection point is set on a formation voltage curve corresponding to the battery cell, and it is determined whether an average voltage difference at the detection point is within a threshold range; if the average voltage difference at the detection point is within the threshold range, it indicates that a negative pressure pipeline corresponding to the battery cell is blocked.

[0034] The method for detecting blockage of a formation negative pressure pipeline provided by the present invention, on the one hand, by drawing a formation voltage curve corresponding to a first-formed battery cell, and using whether the average voltage pressure difference of a detection point on the formation voltage curve is within a threshold range, to judge the blockage of the negative pressure pipeline of the corresponding battery cell, for operators, the judgment is more intuitive, thus improving the detection efficiency and reducing the detection cost; on the other hand, by judging whether the average voltage pressure difference of the detection point is within the threshold range, to judge whether the negative pressure pipeline of the corresponding battery cell is blocked, effectively improving the detection accuracy.

[0035] Further, Figure 2The second flow chart of the method for detecting blockage of a negative pressure pipeline provided by the present invention is as follows: Figure 2 As shown, in order to improve the accuracy of detection, the embodiment of the present invention sets two detection points on the formation voltage curve to determine the blockage of the negative pressure pipeline of the corresponding battery cell. The specific implementation method is as follows: Step 201: setting two detection points on each formation voltage curve, 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; Step 202: respectively obtaining a first detection voltage corresponding to the first detection point and an average voltage of the first detection point, a second detection voltage corresponding to the second detection point and an average voltage of the second detection point; Step 203: determining a first average voltage difference based on the first detection voltage and the average voltage at the first detection point; determining a second average voltage difference based on the second detection voltage and the average voltage at the second detection point; Step 204: Determine a first difference based on the second average voltage difference and the first average voltage difference; Step 205: determining whether the first difference is greater than 0; if the first difference is greater than 0, further determining whether the second average voltage difference is within the threshold range; Step 206: When the second average voltage difference is within the threshold range, it is determined that the negative pressure pipeline of the corresponding battery cell is blocked.

[0036] Specifically, even if the average voltage difference at a certain detection point is within the threshold range, it is not necessarily caused by the blockage of the negative pressure pipeline, but may be caused by other reasons, such as defects inside the battery cell, uneven electrolyte, poor contact of the electrode, etc. Only when the average voltage 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 difference and the first average voltage difference, that is, the first difference. When the first difference is greater than 0, it means that the average voltage difference of the battery cell increases, so that it can be determined that the negative pressure pipeline of the corresponding battery cell is blocked. Therefore, before judging whether the second average voltage 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 scope of judgment and improve the accuracy and efficiency of judgment.

[0037] The method for detecting blockage of a negative pressure circuit provided by the present invention sets a first detection point and a second detection point in a time-increasing manner, and uses the first difference being greater than 0 and the second average voltage difference being within a threshold range to determine whether the negative pressure circuit of the corresponding battery cell is blocked. The method effectively improves the accuracy and efficiency of detection.

[0038] Furthermore, during the formation process of each first-formed cell, before the battery capacity reaches 10%, a formation voltage curve corresponding to each first-formed cell is plotted.

[0039] Specifically, during the formation process of the first formed battery cell, gas will be produced before the battery capacity reaches 10%, and no gas will be produced after the gas production stage; therefore, before the battery capacity reaches 10%, the average voltage differential pressure of the blocked battery cell will gradually increase; and when the battery capacity exceeds 10% SOC, even if there is a blockage in the negative pressure pipeline, it is impossible to know whether the average voltage differential pressure of the detection point is within the threshold range through detection. Therefore, in order to further improve the accuracy of detection, the present application draws the formation voltage curve of the first formed battery cell in the first 10% SOC process of each first formed battery cell, and sets detection points on the formation voltage curve to improve the accuracy of detection.

[0040] Furthermore, 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%.

[0041] Specifically, an embodiment of the present invention provides a setting method of a detection point, wherein 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 precipitation reaction begins to occur inside the battery cell, the internal resistance begins to increase, and the average voltage difference at the detection point begins to increase. If the detection point is set on the formation voltage curve where the battery capacity does not reach 3%, it is impossible to detect signs that the average voltage difference begins to increase. After the battery capacity reaches 10%, even if there is a blockage in the negative pressure pipeline, the average voltage difference at the detection point gradually decreases and falls out of the threshold, and missed detection may occur. Therefore, in order to further improve the accuracy of detection, the embodiment of the present invention sets the first detection point and the second detection point near the battery capacity of the battery cell reaching 3% and 10%, respectively.

[0042] Furthermore, in an embodiment of the present invention, three detection points are set on the formation voltage curve, namely, the first detection point, the second detection point, and the third detection point; wherein 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 a time-increasing manner. Among them, the third detection point corresponds to the third detection voltage and the average voltage of the third detection point, and the third average voltage differential is obtained based on the difference between the third detection voltage and the average voltage of the third detection point. In order to determine whether the negative pressure pipeline of the corresponding battery cell is blocked according to the three detection points, the embodiment of the present invention provides the following scheme: 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 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, further determine whether the negative pressure circuit of the corresponding battery cell is blocked based on whether the second average voltage difference is within the threshold range.

[0043] Specifically, the embodiment of the present invention sets three detection points (the first detection point, the second detection point and the third detection point), and simultaneously determines whether the second difference and the third difference are both greater than 0, to determine 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, but does not use 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; and the third detection point is used for judgment, because its position is not near 10% SOC, there may be a possibility of missed judgment. Therefore, the present application uses the second average voltage difference to determine whether the negative pressure pipeline of the corresponding battery cell is blocked, which can further improve the accuracy of judging the blockage of the negative pressure pipeline of the battery cell.

[0044] In addition, as long as the third detection point is located between the first detection point and the second detection point, the present application does not make any specific limitation on its specific location.

[0045] Figure 3 A schematic diagram of a forming voltage curve of a normal forming cabinet provided in an embodiment of the present invention; Figure 4 for Figure 3 A partial enlarged view of Figure 3 , Figure 4 It can be seen that since all the cells in the formation cabinet are in normal condition and there is no blockage, the formation voltage curves of all the cells tend to overlap. From the figure, it can be seen that it is basically a thick curve. Figure 5 A schematic diagram of a forming voltage curve of a forming cabinet with a single channel blocked provided by an embodiment of the present invention; Figure 6 for Figure 5 A partial enlarged view; 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 indicated by detection point 2 deviates from the other curves, from which it can be judged that the negative pressure pipe of the battery cell corresponding to the deviated curve is blocked. Figure 7 The schematic diagram of the formation voltage curve corresponding to the abnormality of the exit plate is shown in Figure 7 As shown in the figure, when an abnormality occurs in the exit plate, the formation voltage curve corresponding to the cell will deviate from the beginning. If the deviation is caused by a single channel blockage ( Figure 6 ), the deviation occurs after a certain delay after the start of formation. Therefore, for the case where some negative pressure pipes are blocked, the formation voltage curve can be used to intuitively see which battery cell has an abnormality. For some abnormal battery cells, further calculation of the detection points is required to make an accurate judgment. For example: when the average voltage difference exceeds a certain threshold upper limit, it is not obvious enough on the curve, and if it is observed directly on the formation voltage curve, misjudgment may occur. Therefore, the present application can effectively improve the accuracy and efficiency of detection by setting detection points on the formation voltage curve for further judgment.

[0046] Further, it is determined whether the average voltage difference at the detection point is within a threshold range, wherein the threshold range is [first threshold, second threshold].

[0047] The obtaining of the first threshold comprises: According to the preset frequency, the fourth average voltage difference corresponding to all normal battery cells in the formation cabinet within the preset time period is obtained; from all the fourth average voltage differences, the average voltage difference corresponding to the maximum value is selected as the first target average voltage difference; the sum of the first target average voltage difference and the preset value is used as the first threshold value.

[0048] In the embodiment of the present invention, the preset value is determined comprehensively based on factors such as the number of cells in the actual formation cabinet and formation parameters.

[0049] For example, assuming that the preset time period is 1 hour, the preset frequency is 1 time / s, the preset value is 5V, and there are 30 cells in a formation cabinet, the first threshold is obtained as follows: (1) According to formula (2), the average voltage difference of all cells in the formation cabinet is obtained after the first test. For the first test, 30 cells have 30 average voltage differences. Therefore, within one hour, there are 3600*30 average voltage differences. (2) From the 3600*30 average voltage differentials, select the average voltage differential corresponding to the largest value as the maximum value of the average voltage differential of the normalized cabinet, that is, the first target average voltage differential; (3) The final voltage value obtained by adding 5V to the first target average voltage difference is used as the first threshold value; The following describes a method for obtaining the second threshold, which specifically includes the following steps: According to the preset frequency as above, obtain the fifth average voltage difference corresponding to all blocked battery cells in the blocked formation cabinet within the preset time period as above; there is blockage in the channel 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; and use the sum of the second target average voltage difference and the preset value as the second threshold.

[0050] For example, assuming that the preset time period is 1 hour, the preset frequency is 1 time / s, the preset value is 5V, and there are 30 cells in a blocked formation cabinet, and the channel of one cell is blocked, which is called a blocked cell. Then, the second threshold is obtained as follows: According to formula (2), the average voltage difference of the blocked cell detected in the first second is obtained. Within one hour, the blocked cell corresponds to 3600 average voltage differences. The maximum average voltage difference corresponding to the blocked cell is selected from the 3600 average voltage differences as the second target average voltage difference. The final voltage value obtained by adding 5V to the second target average voltage difference is used as the second threshold.

[0051] Based on the above example, assuming that there are 30 battery cells in a blocked formation cabinet, and the channels of 2 battery cells are blocked, the average voltage difference corresponding to the 2 blocked battery cells is obtained after 1s detection. Then, within 1 hour, the 2 blocked battery cells correspond to 2*3600 average voltage differences. The average voltage difference with the largest value is selected from the 2*3600 average voltage differences as the second target average voltage difference; and the final voltage value obtained based on the second target average voltage difference + 5V is used as the second threshold.

[0052] In the process of obtaining the first threshold value of the present application, the battery cells in the formation cabinet are all normal battery cells. On the basis of the first target average voltage differential, the present application adds a preset value to form the first threshold value, so that the threshold for detecting the blockage of the negative pressure pipeline is close to the lower limit, while allowing a certain fault tolerance range (preset value), thereby ensuring the detection accuracy while preventing the misjudgment caused by the fluctuation of the equipment voltage detection, and thus improving the detection accuracy to a certain extent; on the other hand, in the acquisition of the second threshold value, there is at least one battery cell channel in the formation cabinet that is blocked, and the present application obtains the average voltage differential corresponding to the blocked battery cell, rather than the average voltage differential corresponding to the normal battery cell of the non-blocked formation cabinet, so that the acquisition of the second threshold value can be guaranteed, only for the blocked battery cell, thereby effectively improving the accuracy of the threshold value, and further improving the detection accuracy.

[0053] In the embodiment of the present invention, it is preferred to calculate the maximum value of the average voltage difference of the blocked forming cabinet under the condition that only one negative pressure pipe in the blocked forming 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, thereby causing the maximum value of the average voltage difference of the blocked forming cabinet to deviate from the normal range, which will reduce the detection accuracy.

[0054] The negative pressure pipeline blockage detection device provided by the present invention is described below. The negative pressure pipeline blockage detection device described below and the method for detecting blockage of a negative pressure pipeline described above can be referred to each other.

[0055] Figure 8 The structure diagram of the negative pressure pipeline blockage detection device provided by the present invention is as follows: Figure 8 As shown, the device comprises: A drawing unit 801 is used to draw a formation voltage curve corresponding to each battery cell in the formation cabinet; A setting unit 802, used for setting at least one detection point on each of the formation voltage curves; Acquisition unit 803: used to acquire the detection voltage corresponding to each detection point and the average voltage of the detection point; The determination unit 804 is 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.

[0056] Fig. 9 An example of a physical structure diagram of an electronic device is shown in FIG. Fig. 9 As shown, the electronic device may include: a processor 910, a communication interface 920, a memory 930 and a communication bus 940, wherein the processor 910, the communication interface 920, and the memory 930 communicate with each other through the communication bus 940. The processor 910 may call the logic instructions in the memory 930 to execute the method for detecting blockage of the negative pressure pipeline, the method comprising: Step 1: Draw the formation voltage curve corresponding to each first-formed cell in the formation cabinet; Step 2: Set at least one detection point on each formation voltage curve; 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 based on the detection voltage and the average voltage of the detection point.

[0057] In addition, the logic instructions in the above-mentioned memory 930 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory, random access memory, disk or optical disk and other media that can store program codes.

[0058] On the other hand, the present invention further provides a computer program product, the computer program product includes a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the method for detecting blockage of a negative pressure pipeline provided by the above methods, the method comprising: Step 1: Draw the formation voltage curve corresponding to each first-formed cell in the formation cabinet; Step 2: Set at least one detection point on each formation voltage curve; 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 based on the detection voltage and the average voltage of the detection point.

[0059] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the method for detecting blockage of a negative pressure pipeline provided by the above methods, the method comprising: Step 1: Draw the formation voltage curve corresponding to each first-formed cell in the formation cabinet; Step 2: Set at least one detection point on each formation voltage curve; 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 based on the detection voltage and the average voltage of the detection point.

[0060] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0061] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 status of the negative pressure pipeline of the corresponding battery cell according to the detection voltage and the average voltage of the detection point.

2. The method for detecting blockage of a negative pressure formation pipeline according to claim 1, characterized in that: 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: Determine the blockage status of the negative pressure pipeline of the corresponding battery cell according to whether the average voltage difference of the detection point is within a threshold range.

3. The method for detecting blockage of a formation negative pressure pipeline according to claim 2, characterized in that: 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; a second detection voltage corresponding to the second detection point 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.

4. The method for detecting blockage of a formation negative pressure pipeline according to claim 3, 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%.

5. The method for detecting blockage of a formation negative pressure pipeline according to claim 4, 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.

6. The method for detecting blockage of a negative pressure formation pipeline according to any one of claims 1 to 5, 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.

7. The method for detecting blockage of a negative pressure formation pipeline according to any one of claims 2 to 5, 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 blockages in the blocked forming cabinet within the preset time period is obtained; a channel of at least one battery cell in the blocked forming cabinet is blocked; 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.

8. A negative pressure pipeline blockage detection device, 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.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: 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 7 is implemented.

10. 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 7 is implemented.

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