Battery detection method and device and electronic equipment

Abstract

The invention provides a battery detection method and device and electronic equipment. The method comprises the following steps: acquiring a first semi-finished battery piece on a battery production line after back alkali polishing process treatment, and detecting the first semi-finished battery piece to determine whether the reverse current of the first semi-finished battery piece is abnormal or not; if it is determined that the reverse current of the first semi-finished battery piece is not abnormal, obtaining a second semi-finished battery piece which is subjected to the back alkali polishing process and is subjected to the front etching process treatment; detecting the second semi-finished battery piece, and determining whether the reverse current of the second semi-finished battery piece is abnormal or not; and determining whether the produced battery is abnormal or not according to the second detection result. According to the method, rapid detection of the reverse current of the battery piece is realized, the detection cost is reduced, the generation of bad battery pieces is reduced, and the production cost of the battery is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a battery detection method, device and electronic equipment. Background Art

[0002] N-type solar cells have good stability and higher efficiency potential. The current mainstream battery technology is the passivated contact (Tunnel Oxide Passivated Contact, referred to as TOPCon) technology, and TOPCon cells are the current development trend of high-efficiency N-type cells. The process flow of Topcon cells includes: 1. Alkali texturing; 2. Primary boron expansion; 3. Secondary boron expansion; 4. Back-side borosilicate glass (BSG); 5. Back-side alkali polishing; 6. Back-side ultra-thin oxide layer and polysilicon deposition and phosphorus doping; 7. Annealing; 8. Front-side phosphorus silicon glass (PSG); 9. Front-side etching; 10. Aluminum oxide passivation; 11. Front-side silicon nitride; 12. Back-side silicon nitride; 13. Screen printing; 14. Sintering test. It can be seen that the production line has a long circulation time.

[0003] In the related art, after the complete process flow of the TOPCon battery, it is usually determined whether the reverse current of the battery cell is abnormal based on the electrical performance parameters, thereby determining whether the produced battery is abnormal.

[0004] However, the TOPCon battery production process is long and time-consuming, which results in a long and costly testing process. Summary of the invention

[0005] The embodiments of the present invention provide a battery detection method, device and electronic device to solve the problem that battery detection is time-consuming and costly.

[0006] In a first aspect, an embodiment of the present invention provides a battery detection method, comprising:

[0007] Obtaining a first semi-finished battery cell after a back alkali polishing process on a battery production line, and performing a detection process on the first semi-finished battery cell to determine a first detection result of the first semi-finished battery cell; wherein the first detection result is used to characterize whether there is an abnormality in the reverse current of the battery cell;

[0008] If it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, obtaining a second semi-finished battery cell that has been subjected to a back side alkali polishing process and a front side etching process;

[0009] Performing a detection process on the second semi-finished battery cell to determine a second detection result of the second semi-finished battery cell; wherein the second detection result is used to indicate whether there is an abnormality in the reverse current of the battery cell;

[0010] According to the second detection result, it is determined whether the produced battery is abnormal.

[0011] In a possible implementation, the performing a detection process on the first semi-finished battery cell to determine a first detection result of the first semi-finished battery cell includes:

[0012] Performing a microscopic morphology inspection on the first semi-finished battery cell to determine a first microscopic inspection result of the first semi-finished battery cell; wherein the first microscopic inspection result is used to characterize whether there is a reverse current anomaly caused by back alkali polishing leakage in the battery cell;

[0013] Performing screen printing process and sintering test process on the first semi-finished battery, and determining a first performance test result of the first semi-finished battery cell after the screen printing process and the sintering test process; wherein the first performance test result is used to characterize whether the battery has reverse current abnormality caused by process link contamination;

[0014] A first inspection result of the first semi-finished battery cell is determined according to the first microscopic inspection result and the first performance inspection result.

[0015] In a possible implementation, after determining the first detection result of the first semi-finished battery cell, the method further includes:

[0016] If it is determined that the reverse current of the first semi-finished battery cell is abnormal, acquiring an infrared image corresponding to the first semi-finished battery cell;

[0017] Determine first abnormal information causing abnormal reverse current of the first semi-finished battery cell according to the first microscopic detection result and the first performance detection result corresponding to the first semi-finished battery cell and the infrared image corresponding to the first semi-finished battery cell; wherein the first abnormal information includes the leakage position and the leakage cause of the battery cell;

[0018] Based on the first abnormal information, the process flow of battery cell production is optimized.

[0019] In a possible implementation, the performing a detection process on the second semi-finished battery cell to determine a second detection result of the second semi-finished battery cell includes:

[0020] Performing a microscopic morphology inspection on the second semi-finished battery cell to determine a second microscopic inspection result of the second semi-finished battery cell; wherein the second microscopic inspection result is used to characterize whether the battery cell has reverse current anomaly caused by front-side etching leakage;

[0021] Performing screen printing process and sintering test process on the second semi-finished battery, and determining a second performance test result of the second semi-finished battery cell after the screen printing process and the sintering test process; wherein the second performance test result is used to characterize whether the battery has reverse current abnormality caused by process link contamination;

[0022] A second inspection result of the second semi-finished battery cell is determined according to the second microscopic inspection result and the second performance inspection result.

[0023] In a possible implementation, after determining whether the produced battery is abnormal, the method further includes:

[0024] If it is determined that the reverse current of the second semi-finished battery cell is abnormal, acquiring an infrared image corresponding to the second semi-finished battery cell;

[0025] Determine second abnormal information causing abnormal reverse current of the second semi-finished battery cell according to the second microscopic detection result and the second performance detection result corresponding to the second semi-finished battery cell and the infrared image corresponding to the second semi-finished battery cell; wherein the second abnormal information includes the leakage position and the leakage cause of the battery cell;

[0026] Based on the second abnormal information, the process flow of battery cell production is optimized.

[0027] In a possible implementation, performing microscopic morphology detection on the first semi-finished battery cell to determine a first microscopic detection result of the first semi-finished battery cell includes:

[0028] Based on the detection instrument, a first microscopic topography image of the first semi-finished battery cell is generated, image recognition processing is performed on the first microscopic topography image, and first size data of the tower base structure in the first microscopic topography image is determined;

[0029] If it is determined that no pyramid morphology is identified in the first microscopic morphology image, and the first size data meets the first preset condition, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by back alkali polishing leakage;

[0030] If it is determined that a pyramid morphology exists in the first microscopic morphology image, and / or the first size data does not meet the first preset condition, it is determined that the first semi-finished battery cell has a reverse current anomaly caused by missed alkali polishing on the back side; wherein the first preset condition is used to indicate a first size range of the pyramid base structure in the first microscopic morphology image.

[0031] In a possible implementation, the performing screen printing process and sintering test process on the first semi-finished battery, and determining a first performance test result of the first semi-finished battery cell after the screen printing process and sintering test process, includes:

[0032] Performing a screen printing process and a sintering test process on the first semi-finished battery to obtain a third semi-finished battery cell, and obtaining reverse current data of the third semi-finished battery cell;

[0033] If it is determined that the reverse current data is less than the preset threshold, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by process contamination;

[0034] If it is determined that the reverse current data is greater than or equal to the preset threshold, it is determined that the first semi-finished battery cell has reverse current anomaly caused by process contamination.

[0035] In a possible implementation, determining the first test result of the first semi-finished battery cell according to the first microscopic test result and the first performance test result includes:

[0036] If the first semi-finished battery cell does not have a reverse current abnormality caused by back alkali polishing leakage, and the first semi-finished battery does not have a reverse current abnormality caused by process link pollution, it is determined that the reverse current of the first semi-finished battery cell is not abnormal;

[0037] If the first semi-finished battery cell has a reverse current anomaly caused by missed alkali polishing on the back side, and / or the first semi-finished battery cell has a reverse current anomaly caused by contamination in the process link, it is determined that the reverse current of the first semi-finished battery cell is abnormal.

[0038] In a second aspect, an embodiment of the present invention provides a battery detection device, including:

[0039] A first processing unit is used to obtain a first semi-finished battery cell after a back alkali polishing process is performed on a battery production line, and to perform a detection process on the first semi-finished battery cell to determine a first detection result of the first semi-finished battery cell; wherein the first detection result is used to characterize whether there is an abnormality in the reverse current of the battery cell, and the first semi-finished battery cell is a semi-finished battery cell in the battery production line;

[0040] A second processing unit is configured to obtain a second semi-finished cell that has been subjected to a back alkali polishing process and a front etching process if it is determined that the reverse current of the first semi-finished cell is not abnormal;

[0041] A detection unit, used to perform detection processing on the second semi-finished battery cell to determine a second detection result of the second semi-finished battery cell; wherein the second detection result is used to indicate whether there is an abnormality in the reverse current of the battery cell;

[0042] The third processing unit is used to determine whether the produced battery is abnormal according to the second detection result.

[0043] In a third aspect, an embodiment of the present invention 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 computer program, the processor implements the steps of the method described in the first aspect or any possible implementation manner of the first aspect.

[0044] The embodiment of the present invention provides a battery detection method, device and electronic device, which obtains the first semi-finished battery cell after the back alkali polishing process on the battery production line, and detects and processes the first semi-finished battery cell to determine whether the reverse current of the first semi-finished battery cell is abnormal; if it is determined that the reverse current of the first semi-finished battery cell is not abnormal, then obtain the second semi-finished battery cell after the back alkali polishing process and the front etching process; detect and process the second semi-finished battery cell to determine whether the reverse current of the second semi-finished battery cell is abnormal; and determine whether the produced battery is abnormal based on the second detection result. When performing battery detection in this embodiment, it is only necessary to detect the reverse current of the battery cell after the back alkali polishing process and the battery cell after the front etching process to determine whether the produced battery is abnormal, without waiting until the entire production process of the battery is completed to detect whether the battery is abnormal, thereby realizing rapid detection of the battery cell, reducing the detection cost, and reducing the continued generation of defective battery cells, thereby reducing the production cost of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 is a flow chart of an implementation of a battery detection method provided by an embodiment of the present invention;

[0047] Figure 2 is a flowchart of another battery detection method provided by an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of the normal microscopic morphology of a battery cell after back alkali polishing treatment provided by an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of abnormal microscopic morphology of a cell after back alkali polishing provided by an embodiment of the present invention;

[0050] Figure 5 A schematic diagram of an abnormality on the edge of a battery cell provided by an embodiment of the present invention;

[0051] Figure 6 A schematic diagram of an abnormality of the entire surface of a battery cell provided by an embodiment of the present invention;

[0052] Figure 7 A schematic diagram of abnormal contact position of a battery cell tooling provided in an embodiment of the present invention;

[0053] Figure 8 A schematic diagram of the normal microscopic morphology of a cell after front etching treatment provided by an embodiment of the present invention;

[0054] Fig. 9 A schematic diagram of abnormal microscopic morphology of a cell after front etching treatment provided by an embodiment of the present invention;

[0055] Fig.10 is a structural schematic diagram of a battery detection device provided by an embodiment of the present invention;

[0056] Fig.11 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0058] N-type solar cells have good stability and higher efficiency potential. The current mainstream technology is TOPCon technology, which is a new type of passivation contact technology. This technology uses an ultra-thin oxide layer and doped thin film silicon on the surface of the cell for passivation. At the same time, ultra-thin silicon oxide reduces the surface state and maintains a low tunneling resistance. Doped thin film silicon provides field passivation and selectively transmits carriers, forming a good passivation contact with the silicon substrate. TOPCon cells are the current development trend of high-efficiency N-type cells. At present, the process flow of Topcon battery includes: 1. Alkali texturing (takes 40 minutes); 2. First boron expansion (takes 2.5 hours); 3. Second boron expansion (takes 2.5 hours); 4. Back BSG removal (takes 10 minutes); 5. Back alkali polishing (takes 40 minutes); 6. Back ultra-thin oxide layer and polysilicon deposition and phosphorus doping (takes 2.5 hours); 7. Annealing (takes 1 hour); 8. Front PSG removal (takes 10 minutes); 9. Front etching (takes 40 minutes); 10. Alumina passivation (takes 1 hour); 11. Front silicon nitride (takes 1 hour); 12. Back silicon nitride (takes 1 hour); 13. Screen printing (takes 20 minutes); 14. Sintering test (takes 20 minutes). It can be seen that the front-to-back flow time of the entire production line is relatively long.

[0059] The inventors found that in the related art, the reverse current detection of the battery is usually carried out after the sintering test at the end of the normal process of the TOPCon battery, that is, after the entire production process of the battery is completed, and the reverse current of the battery cell is judged to be abnormal based on the electrical performance parameters, and then, whether the produced battery is abnormal. The technical process and time required for monitoring are long, and it is not until the battery production is completed that the reverse current is found to be unqualified. Moreover, even if it is found to be unqualified at this time, it cannot be reworked and can only be discarded, which has a great impact on the cost of industrial production.

[0060] After research, the inventors found that battery abnormalities, that is, abnormal reverse current of the battery cell, are usually accompanied by abnormal infrared test images, which are mainly divided into three types. The first is edge abnormalities, which are usually caused by back alkali polishing or front etching omissions. The second is whole surface abnormalities, which are usually caused by unhealthy process links before back alkali polishing and front etching omissions. The third is abnormal tooling contact position, which is usually caused by unhealthy tooling.

[0061] Therefore, in order to increase the speed of detection and troubleshooting and reduce the detection cost, in the implementation mode of the present application, reverse current detection is performed on the semi-finished battery cells after the two process steps of the back alkali polishing process and the front etching process, so as to achieve rapid troubleshooting of abnormalities in the battery cells and reduce the detection cost. At the same time, the generation of defective batteries is reduced and the production cost is reduced.

[0062] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0063] See also Figure 1 , which shows a flowchart of the battery detection method provided by an embodiment of the present invention, and is described in detail as follows:

[0064] In step 101, a first semi-finished battery cell is obtained after the back side alkali polishing process is performed on the battery production line, and the first semi-finished battery cell is inspected and processed to determine a first inspection result of the first semi-finished battery cell; wherein the first inspection result is used to characterize whether there is an abnormality in the reverse current of the battery cell, and the first semi-finished battery cell is a semi-finished battery cell in the battery production line.

[0065] Illustratively, this embodiment obtains any one or more to-be-detected battery cells among the semi-finished battery cells after the back side alkali polishing process as the first semi-finished battery cell, and based on, for example, one or more of the image, appearance and performance data of the first semi-finished battery cell, detects and processes the reverse current of the first semi-finished battery cell to determine whether the reverse current of the first semi-finished battery cell is abnormal.

[0066] In step 102, if it is determined that the reverse current of the first semi-finished cell is not abnormal, a second semi-finished cell that has been subjected to a back-side alkali polishing process and a front-side etching process is obtained.

[0067] Illustratively, in this embodiment, if it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, the remaining semi-finished battery cells in the battery production line are controlled to continue the process treatment after the back alkali polishing process until the remaining semi-finished battery cells are subjected to the front etching process, and the second semi-finished battery cell after the front etching process is obtained; or, if it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, the first semi-finished battery cell is put into the production line, and the battery cell is continued to be subjected to the process treatment after the back alkali polishing process until it is subjected to the front etching process, and the second semi-finished battery cell is randomly sampled therefrom; or, if it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, the first semi-finished battery cell is controlled to continue the process treatment after the back alkali polishing process until it is subjected to the front etching process, and the second semi-finished battery cell after the front etching process is obtained.

[0068] In step 103, the second semi-finished battery cell is inspected and processed to determine a second inspection result of the second semi-finished battery cell; wherein the second inspection result is used to indicate whether there is an abnormality in the reverse current of the battery cell.

[0069] Exemplarily, this embodiment obtains a semi-finished battery cell generated after a front etching process, which is a second semi-finished battery cell to be inspected and processed, and performs further inspection based on, for example, one or more of the image, appearance and performance data of the second semi-finished battery cell, the reverse current of the second semi-finished battery cell is inspected and processed to determine a second inspection result, i.e., to determine whether the reverse current of the second semi-finished battery cell is abnormal.

[0070] In step 104, it is determined whether the produced battery is abnormal based on the second detection result.

[0071] Illustratively, this embodiment determines whether the currently produced battery is abnormal based on whether the reverse current of the second semi-finished battery cell is abnormal. For example, if it is determined that the reverse current of the second semi-finished battery cell is abnormal, then the currently produced battery is abnormal, and further rework and other processing can be performed; if it is determined that the reverse current of the second semi-finished battery cell is not abnormal, then the currently produced battery cell is normal, and the semi-finished battery cell on the production line that has undergone the front etching process can be controlled to continue to perform subsequent process processing in sequence, including, for example: aluminum oxide passivation, front silicon nitride, back silicon nitride, screen printing, sintering test, until the battery cell production is completed.

[0072] The embodiment of the present invention comprises the following steps: obtaining the first semi-finished battery cell after the back alkali polishing process on the battery production line, and detecting and processing the first semi-finished battery cell to determine whether there is an abnormality in the reverse current of the first semi-finished battery cell; if it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, obtaining the second semi-finished battery cell after the back alkali polishing process and the front etching process; detecting and processing the second semi-finished battery cell to determine whether there is an abnormality in the reverse current of the second semi-finished battery cell; and determining whether the produced battery is abnormal based on the second detection result. When performing battery detection in this embodiment, it is only necessary to detect the reverse current of the battery cell after the back alkali polishing process and the battery cell after the front etching process to determine whether the produced battery is abnormal. There is no need to wait until the entire production process of the battery is completed to detect whether the battery is abnormal, thereby realizing rapid detection of the reverse current of the battery cell, reducing detection costs, reducing the generation of defective battery cells, and reducing the production cost of the battery.

[0073] In addition, in this embodiment, when the first semi-finished battery cell is inspected, the first semi-finished battery cell is inspected in microscopic morphology, and the first semi-finished battery is inspected after being subjected to screen printing process and sintering test process, and then, based on the above two inspection results, the inspection result of the first semi-finished battery cell is accurately determined. Similarly, when the second semi-finished battery cell is inspected, the second semi-finished battery cell may be inspected in microscopic morphology, and the first semi-finished battery is inspected after being subjected to screen printing process and sintering test process, and then, based on the above two inspection results, the inspection result of the second semi-finished battery cell is accurately determined, so that, subsequently, based on the inspection results of the first semi-finished battery cell and the inspection results of the second semi-finished battery cell, it can be accurately and quickly determined whether the produced battery is abnormal.

[0074] For example, Figure 2 A flowchart of another battery detection method provided by an embodiment of the present invention is shown, which is described in detail as follows:

[0075] In step 201, a first semi-finished battery cell that has undergone a back-side alkali polishing process on a battery production line is obtained, and a microscopic morphology inspection is performed on the first semi-finished battery cell to determine a first microscopic inspection result of the first semi-finished battery cell; wherein the first microscopic inspection result is used to characterize whether the battery cell has a reverse current anomaly caused by a missed back-side alkali polishing, and the first semi-finished battery cell is a semi-finished battery cell in the battery production line.

[0076] In one example, step 201 includes the following steps:

[0077] Based on the detection instrument, a first microscopic morphology image of the first semi-finished battery cell is generated, image recognition processing is performed on the first microscopic morphology image, and first size data of the tower base structure in the first microscopic morphology image is determined.

[0078] If it is determined that no pyramid morphology is identified in the first microscopic morphology image, and the first size data meets the first preset condition, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by missed back alkali polishing.

[0079] If it is determined that a pyramid morphology exists in the first microscopic morphology image, and / or the first size data does not meet the first preset condition, it is determined that the first semi-finished battery cell has a reverse current anomaly caused by omissions in the back alkali polishing process; wherein the first preset condition is used to indicate a first size range of the pyramid base structure in the first microscopic morphology image.

[0080] Exemplarily, this embodiment obtains any one or more semi-finished battery cells among the semi-finished battery cells after the back side alkali polishing process, which are the battery cells to be inspected, i.e., the first semi-finished battery cells, and performs microscopic morphology inspection on the first semi-finished battery cells based on the images of the first semi-finished battery cells to determine whether the first semi-finished battery cells have reverse current anomalies caused by back side alkali polishing omissions.

[0081] In one possible implementation, based on a detection instrument, such as a three-dimensional microscope, image detection is performed on the first semi-finished battery cell, a first microscopic morphology image of the first semi-finished battery cell is generated, and image recognition processing is performed on the first microscopic morphology image, and the first size data of the tower base structure in the first microscopic morphology image, such as length data, is determined; if it is determined that the pyramid morphology is not recognized in the first microscopic morphology image, and the first size data meets the preset first size range, it is determined that the first semi-finished battery cell does not have a reverse current anomaly caused by a missed back alkali polishing process; if it is determined that a pyramid morphology exists in the first microscopic morphology image, and / or the first size data does not meet the first size range, it is determined that the first semi-finished battery cell has a reverse current anomaly caused by a missed back alkali polishing process.

[0082] In one example, Figure 3 A schematic diagram of the normal microscopic morphology of a battery cell after back alkali polishing treatment provided by an embodiment of the present invention, Figure 4 A schematic diagram of abnormal microscopic morphology of a cell after back alkali polishing treatment provided by an embodiment of the present invention is provided. A first semi-finished cell after back alkali polishing treatment is obtained. For example, a cell is taken after back alkali polishing treatment corresponding to each pass of a back BSG removal device. Two to three cells are taken for each pass, which are the first semi-finished cell. A microscopic morphology test is performed on the edge of the first semi-finished cell based on a three-dimensional microscope to generate a first microscopic morphology image, such as Figure 3 As shown, if it is recognized that the size of the tower base in the first microscopic topography image is uniform and consistent, between 7 microns and 9 microns, and no such Figure 4 If the pyramid microstructure and its residue are shown, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by missed alkali polishing on the back side; otherwise, it is determined that the first semi-finished battery cell has reverse current anomaly caused by missed alkali polishing on the back side.

[0083] In step 202, the first semi-finished battery is subjected to screen printing process processing and sintering test process processing to determine the first performance test result of the first semi-finished battery cell after the screen printing process processing and the sintering test process processing; wherein the first performance test result is used to characterize whether the battery has reverse current anomaly caused by process contamination.

[0084] In one example, step 202 includes the following steps:

[0085] The first semi-finished battery is processed by screen printing and sintering test to obtain a third semi-finished battery cell, and reverse current data of the third semi-finished battery cell is obtained.

[0086] If it is determined that the reverse current data is less than a preset threshold, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by contamination in the process.

[0087] If it is determined that the reverse current data is greater than or equal to the preset threshold, it is determined that the first semi-finished battery cell has reverse current anomaly caused by contamination in the process.

[0088] Illustratively, after determining the first microscopic inspection result of the first semi-finished battery cell, this embodiment still cannot rule out the existence of other reasons for the first semi-finished battery cell, such as process link pollution, tooling pollution, etc., for this reason, this embodiment performs screen printing process treatment and sintering test process treatment on the first semi-finished battery after the back alkali polishing treatment, and determines the first performance inspection result of the first semi-finished battery cell after the screen printing process treatment and the sintering test process treatment to determine whether the battery has reverse current abnormality caused by process link pollution.

[0089] In one possible implementation, after the first semi-finished battery cell is subjected to microscopic morphology detection, the first semi-finished battery cell is further subjected to screen printing and sintering test processes to obtain a third semi-finished battery cell; or, the semi-finished battery cell subjected to back alkali polishing on the production line is re-obtained as the first semi-finished battery cell, and the first semi-finished battery cell is subjected to screen printing and sintering test processes to obtain reverse current data of the third semi-finished battery cell. If it is determined that the reverse current data is less than a preset threshold, it is determined that the first semi-finished battery cell does not have reverse current anomalies caused by process contamination; if it is determined that the reverse current data is greater than or equal to the preset threshold, it is determined that the first semi-finished battery cell has reverse current anomalies caused by process contamination.

[0090] In one example, the first semi-finished battery cell after the back side alkali polishing process is obtained. For example, cells are taken from each pass of the back side BSG removal equipment after the back side alkali polishing process, 2 to 3 cells are taken from each pass, and then they are subjected to a screen printing process and a sintering test process, and electrical performance data is collected. If the reverse current is abnormal, the cause and location of the abnormality are investigated, and the semi-finished battery cells before or after the back side alkali polishing process on the production line are reworked. If there is no abnormality, the remaining semi-finished battery cells on the production line are controlled to continue the process after the back side alkali polishing process until the front side etching process.

[0091] In an example, 1. After the semi-finished battery cells are unloaded to the BSG equipment end on the back, the corresponding equipment is controlled to collect the cells and distinguish the left and right sides of the silicon wafers. At this time, manual collection of the cells is prohibited to reduce edge contamination caused by human contact that affects test data and judgment; 2. The left and right sides of the silicon wafers are distinguished when unloading from the alkaline trough-type main machine; 3. Screen printing is performed to distinguish the left and right sides of the BSG; 5. After printing, the electrical performance is tested to see if the reverse current (Irev2) is greater than 1; 6. After the test, the silicon wafers are scrapped.

[0092] In step 203, a first inspection result of the first semi-finished battery cell is determined based on the first microscopic inspection result and the first performance inspection result.

[0093] In one example, step 203 includes the following steps:

[0094] If the first semi-finished battery cell does not have reverse current anomaly caused by missed alkali polishing on the back side, and the first semi-finished battery does not have reverse current anomaly caused by contamination in the process link, it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell.

[0095] If the first semi-finished battery cell has reverse current anomaly due to missed alkali polishing on the back side, and / or the first semi-finished battery cell has reverse current anomaly due to contamination in the process link, it is determined that the reverse current of the first semi-finished battery cell is abnormal.

[0096] Exemplarily, this embodiment comprehensively determines the first test result of the first semi-finished battery cell based on the first microscopic test result and the first performance test result. For example, if the first semi-finished battery cell does not have a reverse current anomaly caused by missed etching of the back alkali polishing, and the first semi-finished battery does not have a reverse current anomaly caused by pollution in the process link, then it is determined that the reverse current of the first semi-finished battery cell is not abnormal. Otherwise, it is determined that the reverse current of the first semi-finished battery cell is abnormal. That is, if the first semi-finished battery cell has a reverse current anomaly caused by missed etching of the back alkali polishing, and / or the first semi-finished battery has a reverse current anomaly caused by pollution in the process link, then it is determined that the reverse current of the first semi-finished battery cell is abnormal.

[0097] 204. If it is determined that the reverse current of the first semi-finished battery cell is abnormal, an infrared image corresponding to the first semi-finished battery cell is acquired.

[0098] Exemplarily, if this embodiment determines that there is an abnormality in the reverse current of the first semi-finished battery cell, an infrared image corresponding to the first semi-finished battery cell is identified and generated based on preset equipment, such as an infrared spectrometer, an infrared imager, an infrared sensor, etc., and then the infrared image is acquired.

[0099] 205. Determine first abnormal information causing abnormal reverse current of the first semi-finished battery cell based on the first microscopic inspection result, the first performance inspection result and the infrared image corresponding to the first semi-finished battery cell; wherein the first abnormal information includes the leakage location and the leakage cause of the battery cell.

[0100] Illustratively, if the present embodiment determines that the first semi-finished battery cell has a reverse current anomaly, then the location and cause of the reverse current anomaly of the first semi-finished battery cell, that is, the leakage location and cause of the leakage of the first semi-finished battery cell, can be determined based on the corresponding first microscopic detection result, the first performance detection result and the infrared image corresponding to the first semi-finished battery cell.

[0101] In one example, Figure 5 A schematic diagram of an abnormality on the edge of a battery cell provided by an embodiment of the present invention, Figure 6 A schematic diagram of an abnormality of the entire surface of a battery cell provided by an embodiment of the present invention, Figure 7 A schematic diagram of the abnormal contact position of the battery cell tooling provided by the embodiment of the present invention. The white area in the figure corresponds to the high temperature area in the original infrared image, that is, the leakage area of ​​the battery cell. The reverse current abnormality of the battery cell is accompanied by the abnormal infrared test image, which is mainly divided into three types. The first is the edge abnormality, such as Figure 5 As shown, it is usually caused by back alkali polishing or front etching leakage; the second is the whole surface abnormality, such as Figure 6 It is usually caused by the unqualified hygiene in the process before the back alkali polishing and front etching. The third is the abnormal contact position of the tooling, such as Figure 7 As shown, this is usually caused by substandard workwear hygiene.

[0102] 206. Based on the first abnormal information, optimize the process flow of battery cell production.

[0103] Illustratively, after determining the leakage location and cause of the first semi-finished battery cell, this embodiment can optimize the process flow of battery cell production based on this, for example, by specifically strengthening the hygiene control of the process links, strengthening tooling control, and specifically adjusting each equipment in the process flow and its operating parameters.

[0104] 207. If it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, obtain a second semi-finished battery cell that has been subjected to a back-side alkali polishing process and a front-side etching process.

[0105] Exemplarily, after step 203, if the reverse current of the first semi-finished battery cell is determined to be normal, it means that the first semi-finished battery cell has passed the current detection, and the remaining semi-finished battery cells in the battery production line are controlled to continue to perform the process after the back alkali polishing process until the remaining semi-finished battery cells are processed by the front etching process, and the second semi-finished battery cell after the front etching process is obtained; or, if it is determined that the reverse current of the first semi-finished battery cell is normal, the first semi-finished battery cell is put into the production line, and the battery cell is continued to perform the process after the back alkali polishing process until it is processed by the front etching process, and the second semi-finished battery cell is randomly sampled; or, if it is determined that the reverse current of the first semi-finished battery cell is normal, the first semi-finished battery cell is controlled to continue to perform the process after the back alkali polishing process until it is processed by the front etching process, and the second semi-finished battery cell after the front etching process is obtained. Among them, the process after the back alkali polishing process can include: back ultra-thin oxide layer and polysilicon deposition and phosphorus doping, annealing, front PSG removal and front etching process.

[0106] 208. Perform microscopic morphology inspection on the second semi-finished battery cell to determine a second microscopic inspection result of the second semi-finished battery cell; wherein the second microscopic inspection result is used to characterize whether the battery cell has reverse current anomaly caused by front-side etching leakage.

[0107] Exemplarily, this embodiment obtains a second semi-finished battery cell after the back side alkali polishing process, which is the battery cell to be inspected and processed. Based on the image of the second semi-finished battery cell, the second semi-finished battery cell is subjected to microscopic morphology inspection to determine whether the second semi-finished battery cell has reverse current anomaly caused by front side etching omission.

[0108] In one possible implementation, based on a detection instrument, such as a three-dimensional microscope, image detection is performed on the second semi-finished battery cell to generate a second microscopic morphology image of the second semi-finished battery cell, and image recognition processing is performed on the second microscopic morphology image, and second size data of the tower base structure in the second microscopic morphology image, such as length data, is determined; if it is determined that the pyramid morphology is not recognized in the second microscopic morphology image, and the second size data is consistent with a preset second size range, it is determined that the second semi-finished battery cell does not have a reverse current anomaly caused by a front-side etching omission; if it is determined that a pyramid morphology exists in the second microscopic morphology image, and / or the second size data does not conform to the second size range, it is determined that the second semi-finished battery cell has a reverse current anomaly caused by a front-side etching process omission.

[0109] In one example, Figure 8 A schematic diagram of the normal microscopic morphology of a cell after front etching treatment provided by an embodiment of the present invention, Fig. 9A schematic diagram of abnormal microscopic morphology of a cell after front etching treatment provided by an embodiment of the present invention is provided. A second semi-finished cell after front etching process treatment is obtained. For example, a cell is taken after the front etching process treatment corresponding to each pass of the front PSG device. 2 to 3 cells are taken for each pass, which are the second semi-finished cell. A microscopic morphology test is performed on the edge of the second semi-finished cell based on a three-dimensional microscope to generate a second microscopic morphology image, such as Figure 8 As shown, if it is recognized that the size of the tower base in the second microscopic topography image is uniform, between 24 microns and 27 microns, there is no tower base of 7 microns to 9 microns, and no tower base is recognized in the second microscopic topography image. Fig. 9 If the pyramid microstructure and its residue are shown, it is determined that the second semi-finished battery cell does not have reverse current anomaly caused by front-side etching omission; otherwise, it is determined that the second semi-finished battery cell has reverse current anomaly caused by front-side etching omission.

[0110] In one example, the main function of the back alkali polishing treatment is to remove the PN junctions formed by boron diffusion around and on the back of the cell during the first boron expansion and the second boron expansion process, so as to avoid leakage of the battery due to the presence of PN junctions around and on the back. The main function of the front etching is to remove the PN junctions formed by phosphorus diffusion around and on the front of the battery during the ultra-thin oxide layer and polysilicon deposition and phosphorus doping on the back, so as to avoid leakage of the battery due to the presence of PN junctions around and on the front. In addition, if the back alkali polishing process is normal, the size of the tower base around and on the back detected by a three-dimensional microscope is about 7 to 9 microns. If the front etching continues, the size of the gold tower base around and on the back should be about 24 to 27 microns.

[0111] 209. Perform screen printing process and sintering test process on the second semi-finished battery to determine the second performance test result of the second semi-finished battery cell after the screen printing process and sintering test process; wherein the second performance test result is used to characterize whether the battery has reverse current anomaly caused by process contamination.

[0112] Illustratively, after determining the second microscopic inspection result of the second semi-finished battery cell, this embodiment still cannot rule out the existence of other reasons for the second semi-finished battery cell, such as reverse current abnormality caused by process link pollution and tooling pollution. For this reason, the second semi-finished battery is subjected to screen printing process treatment and sintering test process treatment, and the second performance inspection result of the second semi-finished battery cell after the screen printing process treatment and the sintering test process treatment is determined to determine whether the battery has reverse current abnormality caused by process link pollution.

[0113] In one possible implementation, after the second semi-finished battery cell is subjected to microscopic morphology detection, the second semi-finished battery cell is further subjected to screen printing and sintering test processes to obtain a fourth semi-finished battery cell, or the semi-finished battery cell subjected to the front etching process on the production line is re-obtained as the second semi-finished battery cell, and the second semi-finished battery cell is then subjected to screen printing and sintering test processes to obtain a fourth semi-finished battery cell, and then reverse current data of the fourth semi-finished battery cell is obtained. If it is determined that the reverse current data is less than a preset threshold, it is determined that the second semi-finished battery cell does not have a reverse current anomaly caused by contamination in the process link; if it is determined that the reverse current data is greater than or equal to the preset threshold, it is determined that the second semi-finished battery cell has a reverse current anomaly caused by contamination in the process link.

[0114] In one example, a second semi-finished battery cell after the front etching process is obtained. For example, each pass of the front PSG equipment is taken after the front etching process, 2 to 3 cells are taken for each pass, and then they are processed through a screen printing process and a sintering test process, and electrical performance data is collected. If the reverse current is abnormal, the cause and location of the abnormality are investigated, and the semi-finished battery cells before or after the front etching process on the production line are reworked. If there is no abnormality, the remaining semi-finished battery cells on the production line are controlled to continue the process after the front etching process until the production of the battery cells is completed.

[0115] In an example, 1. After the semi-finished battery cells are unloaded to the PSG equipment end on the back, the corresponding equipment is controlled to collect the cells and distinguish the left and right sides of the silicon wafers. At this time, manual collection of the cells is prohibited to reduce edge contamination caused by human contact that affects test data and judgment; 2. The left and right sides of the silicon wafers are distinguished when unloading from the positive groove host station; 3. Screen printing is used to distinguish the left and right sides of the PSG; 5. After printing, the electrical performance is tested to see if the reverse current (Irev2) is greater than 1; 6. After the test, the silicon wafers are scrapped.

[0116] In an example, Table 1 is an electrical performance data table of a battery cell provided by an embodiment of the present invention. In Table 1, it can be seen that after the first performance test and the second performance test, the electrical performance data of the battery cell can be obtained. In the electrical performance data, the indicator reflecting whether there is leakage is mainly the reverse current. According to the value of the reverse current, it can be determined whether the corresponding battery cell has leakage. For example, a preset threshold value, such as 1 ampere, is set. When it is less than this value, it is normal, and when it is greater than this value, it is abnormal.

[0117] Table 1 Battery Cell Electrical Performance Data Table

[0118]

[0119] 210. Determine a second inspection result of the second semi-finished battery cell according to the second microscopic inspection result and the second performance inspection result.

[0120] In one example, step 210 includes the following steps:

[0121] If the second semi-finished battery cell does not have reverse current anomalies caused by front-side etching omissions, and the second semi-finished battery does not have reverse current anomalies caused by process contamination, it is determined that there is no reverse current anomaly in the second semi-finished battery cell.

[0122] If the second semi-finished battery cell has reverse current anomaly due to front-side etching omissions, and / or the second semi-finished battery cell has reverse current anomaly due to process contamination, it is determined that the reverse current of the second semi-finished battery cell is abnormal.

[0123] Exemplarily, this embodiment comprehensively determines the second test result of the second semi-finished battery cell based on the second microscopic test result and the second performance test result. For example, if the second semi-finished battery cell does not have a reverse current anomaly caused by front etching leakage, and the second semi-finished battery does not have a reverse current anomaly caused by process link pollution, then it is determined that the reverse current of the second semi-finished battery cell is not abnormal. Otherwise, it is determined that the reverse current of the second semi-finished battery cell is abnormal. That is, if the second semi-finished battery cell has a reverse current anomaly caused by front etching leakage, and / or the second semi-finished battery has a reverse current anomaly caused by process link pollution, then it is determined that the reverse current of the second semi-finished battery cell is abnormal.

[0124] 211. Determine whether the produced battery is abnormal based on the second detection result.

[0125] In one example, this embodiment determines whether the battery currently being produced is abnormal based on whether the reverse current of the second semi-finished battery cell is abnormal. For example, if it is determined that the reverse current of the second semi-finished battery cell is abnormal, then the battery currently being produced is abnormal, and further rework and other processing can be performed; if it is determined that the reverse current of the second semi-finished battery cell is not abnormal, then the battery currently being produced is normal, and the remaining semi-finished battery cells that have undergone the front etching process on the production line can be controlled to continue to perform subsequent process processing in sequence, including, for example: aluminum oxide passivation, front silicon nitride, back silicon nitride, screen printing, sintering testing, until the battery cell production is completed.

[0126] 212. If it is determined that the reverse current of the second semi-finished battery cell is abnormal, an infrared image corresponding to the second semi-finished battery cell is acquired.

[0127] Illustratively, if this embodiment determines that there is an abnormality in the reverse current of the second semi-finished battery cell, an infrared image corresponding to the second semi-finished battery cell is identified and generated based on preset equipment, such as an infrared spectrometer, an infrared imager, an infrared sensor, etc., and then the infrared image is acquired.

[0128] 213. Determine second abnormal information causing abnormal reverse current of the second semi-finished battery cell based on the second microscopic inspection result, the second performance inspection result and the infrared image corresponding to the second semi-finished battery cell; wherein the second abnormal information includes the leakage position and the leakage cause of the battery cell.

[0129] Illustratively, if the present embodiment determines that the second semi-finished battery cell has a reverse current anomaly, then the location and cause of the reverse current anomaly in the second semi-finished battery cell, that is, the leakage location and cause of the leakage in the second semi-finished battery cell, can be determined based on the corresponding second microscopic detection result, the second performance detection result and the infrared image corresponding to the second semi-finished battery cell.

[0130] 214. Based on the second abnormal information, optimize the process flow of battery cell production.

[0131] Illustratively, after determining the leakage location and cause of the second semi-finished battery cell, this embodiment can optimize the process flow of battery cell production based on this, for example, by specifically strengthening the hygiene control of the process links, strengthening tooling control, and specifically adjusting each equipment in the process flow and its operating parameters.

[0132] The embodiment of the present invention performs reverse current detection on the semi-finished battery cells after the two process steps of back alkali polishing process and front etching process, which not only saves verification time but also avoids the generation of a large number of unqualified battery cells. It can realize the rapid detection of abnormalities in battery cells, reduce detection costs, and at the same time, reduce production costs.

[0133] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0134] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0135] Fig.10 The structure diagram of the battery detection device provided by the embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0136] like Fig.10As shown, the battery detection device 3 includes:

[0137] The first processing unit 31 is used to obtain the first semi-finished battery cell after the back side alkali polishing process, and detect the first semi-finished battery cell to determine the first detection result of the first semi-finished battery cell; wherein the first detection result is used to characterize whether there is an abnormality in the reverse current of the battery cell, and the first semi-finished battery cell is a semi-finished battery cell in the battery production line.

[0138] The second processing unit 32 is used to obtain a second semi-finished cell that has been processed by a back alkali polishing process and a front etching process if it is determined that there is no abnormality in the reverse current of the first semi-finished cell.

[0139] The detection unit 33 is used to detect the second semi-finished battery cell and determine a second detection result of the second semi-finished battery cell; wherein the second detection result is used to indicate whether there is an abnormality in the reverse current of the battery cell.

[0140] The third processing unit 34 is used to determine whether the produced battery is abnormal according to the second detection result.

[0141] In a possible implementation, the first processing unit 31 includes:

[0142] The first detection subunit is used to perform microscopic morphology detection on the first semi-finished battery cell to determine a first microscopic detection result of the first semi-finished battery cell; wherein the first microscopic detection result is used to characterize whether there is a reverse current anomaly caused by missed alkali polishing on the back side of the battery cell.

[0143] The first processing sub-unit is used to perform screen printing process processing and sintering test process processing on the first semi-finished battery, and determine the first performance test result of the first semi-finished battery cell after the screen printing process processing and the sintering test process processing; wherein the first performance test result is used to characterize whether the battery has reverse current anomaly caused by contamination in the process link.

[0144] The first determination subunit is used to determine a first detection result of the first semi-finished battery cell according to the first microscopic detection result and the first performance detection result.

[0145] In a possible implementation manner, after the first processing unit 31, the device further includes:

[0146] The first acquisition unit is used to acquire an infrared image corresponding to the first semi-finished battery cell if it is determined that the reverse current of the first semi-finished battery cell is abnormal.

[0147] The fourth processing unit is used to determine the first abnormal information causing the abnormal reverse current of the first semi-finished battery cell based on the first microscopic detection result corresponding to the first semi-finished battery cell, the first performance detection result and the infrared image corresponding to the first semi-finished battery cell; wherein the first abnormal information includes the leakage position and the leakage cause of the battery cell.

[0148] The first optimization unit is used to optimize the process flow of battery cell production based on the first abnormal information.

[0149] In a possible implementation, the detection unit 33 includes:

[0150] The second detection subunit is used to perform microscopic morphology detection on the second semi-finished battery cell to determine a second microscopic detection result of the second semi-finished battery cell; wherein the second microscopic detection result is used to characterize whether there is reverse current anomaly caused by front-side etching leakage in the battery cell.

[0151] The second processing sub-unit is used to perform screen printing process and sintering test process on the second semi-finished battery, and determine the second performance test result of the second semi-finished battery cell after the screen printing process and the sintering test process; wherein the second performance test result is used to characterize whether the battery has reverse current anomaly caused by process contamination.

[0152] The second determining subunit is used to determine a second detection result of the second semi-finished battery cell according to the second microscopic detection result and the second performance detection result.

[0153] In a possible implementation, after the third processing unit 34, the device further includes:

[0154] The second acquisition unit is used to acquire an infrared image corresponding to the second semi-finished battery cell if it is determined that the reverse current of the second semi-finished battery cell is abnormal.

[0155] The fifth processing unit is used to determine the second abnormal information causing the abnormal reverse current of the second semi-finished battery cell based on the second microscopic inspection result corresponding to the second semi-finished battery cell, the second performance inspection result and the infrared image corresponding to the second semi-finished battery cell; wherein the second abnormal information includes the leakage location and the leakage cause of the battery cell.

[0156] The second optimization unit is used to optimize the process flow of battery cell production based on the second abnormal information.

[0157] In a possible implementation, the first detection subunit includes:

[0158] The first processing module is used to generate a first microscopic morphology image of a first semi-finished battery cell based on a detection instrument, perform image recognition processing on the first microscopic morphology image, and determine first size data of a tower base structure in the first microscopic morphology image.

[0159] The first judgment module is used to determine that the first semi-finished battery cell does not have reverse current anomaly caused by back alkali polishing leakage if it is determined that no pyramid morphology is identified in the first microscopic morphology image and the first size data meets the first preset condition.

[0160] The second judgment module is used to determine that the first semi-finished battery cell has a reverse current anomaly caused by missed alkali polishing on the back side if it is determined that there is a pyramid morphology in the first microscopic morphology image and / or the first size data does not meet the first preset condition; wherein the first preset condition is used to indicate a first size range of the pyramid base structure in the first microscopic morphology image.

[0161] In a possible implementation, the first processing subunit includes:

[0162] The second processing module is used to perform screen printing and sintering test processes on the first semi-finished battery to obtain a third semi-finished battery cell and acquire reverse current data of the third semi-finished battery cell.

[0163] The third judgment module is used to determine that the first semi-finished battery cell does not have reverse current anomaly caused by process contamination if it is determined that the reverse current data is less than a preset threshold.

[0164] The fourth judgment module is used to determine that the reverse current abnormality of the first semi-finished battery cell is caused by contamination in the process if it is determined that the reverse current data is greater than or equal to a preset threshold.

[0165] In a possible implementation manner, the first determining subunit includes:

[0166] The fifth judgment module is used to determine that there is no abnormality in the reverse current of the first semi-finished battery cell if there is no reverse current abnormality caused by missed alkali polishing on the back side of the first semi-finished battery cell and there is no reverse current abnormality caused by contamination in the process link of the first semi-finished battery cell.

[0167] The sixth judgment module is used to determine that the reverse current of the first semi-finished battery cell is abnormal if the reverse current of the first semi-finished battery cell is abnormal due to missed alkali polishing on the back side and / or the reverse current of the first semi-finished battery cell is abnormal due to contamination in the process link.

[0168] Fig.11 Schematic diagram of an electronic device provided by an embodiment of the present invention. Fig.11As shown, the terminal 4 of this embodiment includes: a processor 40 and a memory 41. The memory 41 is used to store a computer program 42, and the processor 40 is used to call and run the computer program 42 stored in the memory 41 to perform the steps in the above-mentioned various battery detection method embodiments, such as Figure 1 Alternatively, the processor 40 is used to call and run the computer program 42 stored in the memory 41 to implement the functions of each module / unit in the above-mentioned device embodiments, such as Fig.10 The functions of the units 31 to 34 are shown.

[0169] Exemplarily, the computer program 42 may be divided into one or more modules / units, one or more modules / units are stored in the memory 41 and executed by the processor 40 to implement the present invention. One or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 42 in the terminal 4. For example, the computer program 42 may be divided into Fig.10 Units 31 to 34 are shown.

[0170] The terminal 4 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that Figure 4 It is only an example of terminal 4 and does not constitute a limitation on terminal 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal may also include input and output devices, network access devices, buses, etc.

[0171] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0172] The memory 41 may be an internal storage unit of the terminal 4, such as a hard disk or memory of the terminal 4. The memory 41 may also be an external storage device of the terminal 4, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the terminal 4. Further, the memory 41 may also include both an internal storage unit of the terminal 4 and an external storage device. The memory 41 is used to store computer programs and other programs and data required by the terminal. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0173] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0174] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0175] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0176] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0177] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0178] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0179] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned battery detection method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0180] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such 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, and should be included in the protection scope of the present invention.

Claims

1. A battery detection method, characterized in that: The method comprises: Obtaining a first semi-finished battery cell after a back-side alkali polishing process on a battery production line, and performing a detection process on the first semi-finished battery cell to determine a first detection result of the first semi-finished battery cell; wherein the first detection result is used to characterize whether there is an abnormality in the reverse current of the battery cell; If it is determined that there is no abnormality in the reverse current of the first semi-finished battery cell, obtaining a second semi-finished battery cell that has been subjected to a back side alkali polishing process and a front side etching process; Performing a detection process on the second semi-finished battery cell to determine a second detection result of the second semi-finished battery cell; wherein the second detection result is used to indicate whether there is an abnormality in the reverse current of the battery cell; According to the second detection result, it is determined whether the produced battery is abnormal.

2. The method according to claim 1, characterized in that The performing a detection process on the first semi-finished battery cell to determine a first detection result of the first semi-finished battery cell includes: Performing a microscopic morphology inspection on the first semi-finished battery cell to determine a first microscopic inspection result of the first semi-finished battery cell; wherein the first microscopic inspection result is used to characterize whether there is a reverse current anomaly caused by back alkali polishing leakage in the battery cell; Performing screen printing process and sintering test process on the first semi-finished battery, and determining a first performance test result of the first semi-finished battery cell after the screen printing process and the sintering test process; wherein the first performance test result is used to characterize whether the battery has reverse current abnormality caused by process contamination; A first inspection result of the first semi-finished battery cell is determined according to the first microscopic inspection result and the first performance inspection result.

3. The method according to claim 2, characterized in that After determining a first detection result of the first semi-finished battery cell, the method further includes: If it is determined that the reverse current of the first semi-finished battery cell is abnormal, acquiring an infrared image corresponding to the first semi-finished battery cell; Determine first abnormal information causing abnormal reverse current of the first semi-finished battery cell according to the first microscopic detection result and the first performance detection result corresponding to the first semi-finished battery cell and the infrared image corresponding to the first semi-finished battery cell; wherein the first abnormal information includes the leakage position and the leakage cause of the battery cell; Based on the first abnormal information, the process flow of battery cell production is optimized.

4. The method according to any one of claims 1 to 3, characterized in that The performing a detection process on the second semi-finished battery cell to determine a second detection result of the second semi-finished battery cell includes: Performing a microscopic morphology inspection on the second semi-finished battery cell to determine a second microscopic inspection result of the second semi-finished battery cell; wherein the second microscopic inspection result is used to characterize whether the battery cell has a reverse current anomaly caused by front-side etching leakage; Performing screen printing process and sintering test process on the second semi-finished battery, and determining a second performance test result of the second semi-finished battery cell after the screen printing process and the sintering test process; wherein the second performance test result is used to characterize whether the battery has reverse current abnormality caused by process contamination; A second inspection result of the second semi-finished battery cell is determined according to the second microscopic inspection result and the second performance inspection result.

5. The method according to claim 4, characterized in that After determining whether the produced battery is abnormal, the method further includes: If it is determined that the reverse current of the second semi-finished battery cell is abnormal, acquiring an infrared image corresponding to the second semi-finished battery cell; Determine second abnormal information causing abnormal reverse current of the second semi-finished battery cell according to the second microscopic detection result and the second performance detection result corresponding to the second semi-finished battery cell and the infrared image corresponding to the second semi-finished battery cell; wherein the second abnormal information includes the leakage position and the leakage cause of the battery cell; Based on the second abnormal information, the process flow of battery cell production is optimized.

6. The method according to claim 2 or 3, characterized in that: The performing microscopic morphology inspection on the first semi-finished battery cell to determine a first microscopic inspection result of the first semi-finished battery cell includes: Based on the detection instrument, a first microscopic topography image of the first semi-finished battery cell is generated, image recognition processing is performed on the first microscopic topography image, and first size data of the tower base structure in the first microscopic topography image is determined; If it is determined that no pyramid morphology is identified in the first microscopic morphology image, and the first size data meets the first preset condition, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by back alkali polishing; If it is determined that a pyramid morphology exists in the first microscopic morphology image, and / or the first size data does not meet the first preset condition, it is determined that the first semi-finished battery cell has a reverse current anomaly caused by missed alkali polishing on the back side; wherein the first preset condition is used to indicate a first size range of the pyramid base structure in the first microscopic morphology image.

7. The method according to claim 2 or 3, characterized in that: The step of performing screen printing process and sintering test process on the first semi-finished battery to determine a first performance test result of the first semi-finished battery cell after the screen printing process and sintering test process includes: Performing a screen printing process and a sintering test process on the first semi-finished battery to obtain a third semi-finished battery cell, and obtaining reverse current data of the third semi-finished battery cell; If it is determined that the reverse current data is less than the preset threshold, it is determined that the first semi-finished battery cell does not have reverse current anomaly caused by process contamination; If it is determined that the reverse current data is greater than or equal to the preset threshold, it is determined that the first semi-finished battery cell has reverse current anomaly caused by process contamination.

8. The method according to claim 2 or 3, characterized in that: Determining a first test result of the first semi-finished battery cell according to the first microscopic test result and the first performance test result includes: If the first semi-finished battery cell does not have a reverse current abnormality caused by back alkali polishing leakage, and the first semi-finished battery does not have a reverse current abnormality caused by process link pollution, it is determined that the reverse current of the first semi-finished battery cell is not abnormal; If the first semi-finished battery cell has reverse current abnormality caused by missed alkali polishing on the back side, and / or the first semi-finished battery cell has reverse current abnormality caused by contamination in the process link, it is determined that the reverse current of the first semi-finished battery cell is abnormal.

9. A battery detection device, characterized in that: The device comprises: A first processing unit is used to obtain a first semi-finished battery cell after a back alkali polishing process is performed on a battery production line, and to detect and process the first semi-finished battery cell to determine a first detection result of the first semi-finished battery cell; wherein the first detection result is used to indicate whether there is an abnormality in the reverse current of the battery cell; A second processing unit is configured to obtain a second semi-finished cell that has been subjected to a back alkali polishing process and a front etching process if it is determined that the reverse current of the first semi-finished cell is not abnormal; A detection unit, configured to perform detection processing on the second semi-finished battery cell to determine a second detection result of the second semi-finished battery cell; wherein the second detection result is used to indicate whether there is an abnormality in the reverse current of the battery cell; The third processing unit is used to determine whether the produced battery is abnormal according to the second detection result.

10. An electronic device, characterized in that: The invention comprises a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the battery detection method according to any one of claims 1 to 8.

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