Lithium iron phosphate battery capacity correction method and device

Abstract

The invention discloses a lithium iron phosphate battery capacity correction method and device, and belongs to the technical field of secondary batteries. The lithium iron phosphate battery capacity correction method comprises the following steps: constructing a battery cell capacity correction curve aiming at lithium iron phosphate battery cells for production line equipment by utilizing capacity detection values, detected by the production line equipment, of the lithium iron phosphate battery cells with different capacities and standard capacities, detected under standard conditions, of the lithium iron phosphate battery cells with different capacities, the detection temperature of the production line equipment is not associated with the detection temperature of the standard condition; and correcting the battery cell capacity of any lithium iron phosphate battery cell detected by production line equipment by utilizing the battery cell capacity correction curve. According to the method, the cell capacity detection accuracy of the lithium iron phosphate battery can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and in particular to a method and device for correcting the capacity of a lithium iron phosphate battery. Background Art

[0002] In the production process of secondary batteries (such as ternary square lithium-ion batteries, lithium iron phosphate batteries, etc.), it is generally necessary to detect the cell capacity of the secondary battery in order to assemble the battery pack for the electric vehicle based on the cell capacity. The accuracy of the cell capacity detection results will directly affect the performance of the subsequently assembled battery pack. It is currently believed that temperature is an influencing factor that affects the accuracy of cell capacity detection. Therefore, at present, the detected cell capacity is generally corrected by a temperature compensation curve for the detected cell capacity. However, through research, it was found that the cell capacity detection results of lithium iron phosphate batteries are not greatly affected by temperature, resulting in the current use of the temperature compensation curve to correct the cell capacity of lithium iron phosphate batteries. The accuracy of the cell capacity of lithium iron phosphate batteries is still relatively low. Summary of the invention

[0003] In view of this, the present invention provides a method and device for correcting the capacity of a lithium iron phosphate battery, which can effectively improve the accuracy of detecting the cell capacity of the lithium iron phosphate battery.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a method for correcting the capacity of a lithium iron phosphate battery, comprising:

[0006] Using the capacity detection values ​​of lithium iron phosphate cells of different capacities detected by the production line equipment and the standard capacities of lithium iron phosphate cells of different capacities detected under standard conditions, a cell capacity correction curve for the lithium iron phosphate cells is constructed for the production line equipment, wherein the detection temperature of the production line equipment is not associated with the detection temperature under the standard conditions;

[0007] The cell capacity correction curve is used to correct the capacity detection value of any lithium iron phosphate cell detected by the production line equipment.

[0008] Optionally, the battery cell capacity correction curve indicates that there is a linear correlation between the capacity detection value of the lithium iron phosphate battery cell and the standard capacity.

[0009] Optionally, the above method for correcting the capacity of a lithium iron phosphate battery further includes:

[0010] The production line equipment and / or the detection environment are optimized by utilizing the difference between the capacity detection value of the lithium iron phosphate battery cells of different capacities and the standard capacity of the lithium iron phosphate battery cells of different capacities or the battery cell capacity correction curve.

[0011] Optionally, the above method for correcting the capacity of a lithium iron phosphate battery further includes:

[0012] Under standard conditions, test the standard capacity of lithium iron phosphate cells with different capacities at multiple temperatures;

[0013] From the standard capacities at multiple temperatures detected under the standard conditions, it is determined that temperature is not an influencing factor affecting the accuracy of capacity detection of the lithium iron phosphate battery cell.

[0014] Optionally, the above method for correcting the capacity of a lithium iron phosphate battery further includes:

[0015] The production line equipment is determined as the factor affecting the capacity detection accuracy of lithium iron phosphate batteries.

[0016] Optionally, the detection temperature is any value within the range of 25°C to 45°C.

[0017] Optionally, the above method for correcting the capacity of a lithium iron phosphate battery further includes:

[0018] The corrected cell capacity is output in real time for the lithium iron phosphate cells detected by the production line equipment, so as to mark the lithium iron phosphate cells using the corrected cell capacity or sort the lithium iron phosphate cells using the corrected cell capacity.

[0019] In a second aspect, an embodiment of the present invention provides a device for correcting the capacity of a lithium iron phosphate battery, comprising: a curve building module and a correction module, wherein:

[0020] The curve construction module is used to construct a cell capacity correction curve for the lithium iron phosphate battery cell for the production line equipment by using the capacity detection values ​​of the lithium iron phosphate battery cells of different capacities detected by the production line equipment and the standard capacities of the lithium iron phosphate battery cells of different capacities detected under standard conditions, wherein the detection temperature of the production line equipment is not associated with the detection temperature of the standard conditions;

[0021] The correction module is used to correct the cell capacity of any lithium iron phosphate cell detected by the production line equipment using the cell capacity correction curve.

[0022] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0023] one or more processors;

[0024] a storage device for storing one or more programs,

[0025] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for correcting the capacity of a lithium iron phosphate battery provided in the first aspect embodiment above.

[0026] In a fourth aspect, an embodiment of the present invention provides a computer-readable medium on which a computer program for a method for correcting the capacity of a lithium iron phosphate battery is stored.

[0027] When the computer program is executed by the vehicle-mounted processor, the method for correcting the capacity of the lithium iron phosphate battery provided in the first aspect embodiment described above is implemented.

[0028] The technical solution of the above invention has the following advantages or beneficial effects:

[0029] The technical solution provided by the embodiment of the present invention utilizes the capacity detection values ​​of lithium iron phosphate battery cells of different capacities detected by production line equipment and the standard capacity of lithium iron phosphate battery cells of different capacities detected under standard conditions to construct a cell capacity correction curve for lithium iron phosphate battery cells for the production line equipment. The detection temperature of the production line equipment is not correlated with the detection temperature under standard conditions. That is, the technical solution provided by the present invention utilizes the cell capacity correction curve to correct the cell capacity of any lithium iron phosphate battery cell detected by the production line equipment without paying attention to the detection temperature, thereby effectively improving the accuracy of cell capacity detection of lithium iron phosphate batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the main process of a method for correcting the capacity of a lithium iron phosphate battery provided according to an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of the main process of a method for correcting the capacity of a lithium iron phosphate battery according to another embodiment of the present invention;

[0032] Figure 3 is a temperature-standard capacity curve diagram of two lithium iron phosphate battery cells detected under standard conditions provided by an embodiment of the present invention;

[0033] Figure 4 is a cell capacity correction curve diagram of a lithium iron phosphate cell provided according to an embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of the main process of the method for identifying factors affecting the accuracy of lithium iron phosphate battery capacity measurement provided by an embodiment of the present invention;

[0035] Figure 6 is a partial structural schematic diagram of a device for correcting the capacity of a lithium iron phosphate battery provided in accordance with an embodiment of the present invention;

[0036] Figure 7 is a partial structural schematic diagram of a lithium iron phosphate battery capacity correction system provided according to an embodiment of the present invention;

[0037] Figure 8is an exemplary system architecture diagram to which embodiments of the present invention may be applied;

[0038] Fig. 9 It is a structural schematic diagram of a computer system suitable for implementing the correction of the capacity of a lithium iron phosphate battery according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0040] It should be pointed out that the embodiments of the present invention and the technical features therein may be combined with each other without conflict.

[0041] Figure 1 FIG. 1 is a schematic diagram of the main steps of a method for correcting the capacity of a lithium iron phosphate battery according to an embodiment of the present invention. Specifically, Figure 1 As shown, the method for correcting the capacity of the lithium iron phosphate battery mainly includes the following steps:

[0042] Step S101: construct a correction curve, using the capacity detection values ​​of lithium iron phosphate batteries of different capacities detected by the production line equipment and the standard capacity of lithium iron phosphate batteries of different capacities detected under standard conditions, to construct a cell capacity correction curve for lithium iron phosphate batteries for the production line equipment, wherein the detection temperature of the production line equipment is not correlated with the detection temperature under standard conditions.

[0043] Among them, standard conditions generally refer to laboratory environments. Production line equipment refers to equipment used to detect the discharge capacity of lithium iron phosphate batteries on the production line of lithium iron phosphate batteries. Its test results may be affected by the environment and the operating parameters of the test equipment itself. Based on this, there will be errors between the test results of the production line equipment and the test results of standard conditions (i.e., standard capacity), resulting in different test results of the same lithium iron phosphate battery by different production line equipment. The technical solution provided by the embodiment of the present invention can eliminate the detection errors caused by different production line equipment by correcting the test results of lithium iron phosphate batteries.

[0044] Among them, the capacity detection value of this step can be the discharge capacity of the lithium iron phosphate battery cell directly detected by the production line equipment, or it can be the ratio between the discharge capacities of the lithium iron phosphate battery cell under two discharge rates detected by the production line equipment (i.e., the discharge capacity ratio), wherein the two discharge rates can be any combination of two fixed values, for example, the two discharge rates can be a combination of 1 discharge rate and 5 discharge rates, a combination of 2 discharge rates and 7 discharge rates, a combination of 5 discharge rates and 10 discharge rates, etc. For example, the discharge capacity ratio can be C1 / C5 (C1 represents the discharge capacity at 1 discharge rate, and C5 represents the discharge capacity at 5 discharge rates), C2 / C7 (C2 represents the discharge capacity at 2 discharge rates, and C7 represents the discharge capacity at 7 discharge rates), C5 / C10 (C5 represents the discharge capacity at 5 discharge rates, and C10 represents the discharge capacity at 10 discharge rates), etc. Preferably, the discharge capacity ratio is C1 / C5.

[0045] In addition, the detection temperature of the production line equipment is not related to the detection temperature under standard conditions, which means that the ambient temperature of the production line equipment during the detection of lithium iron phosphate cells is independent of the ambient temperature of the production line equipment during the detection of lithium iron phosphate cells under standard conditions, that is, the production line equipment can detect lithium iron phosphate cells at any ambient temperature, and the detection of lithium iron phosphate cells under standard conditions can also be completed at any ambient temperature. Moreover, the production line equipment does not limit the ambient temperature for the detection of lithium iron phosphate cells of different capacities, and the detection of lithium iron phosphate cells of different capacities under standard conditions does not limit the ambient temperature.

[0046] The detection temperature may be any value within the range of 25° C. to 45° C. For example, the detection temperature may be 25° C., 28° C., 30° C., 32° C., 35° C., 38° C., 40° C., 42° C. or 45° C., etc.

[0047] It can be understood that for each capacity of lithium iron phosphate battery cells, multiple lithium iron phosphate battery cells of the same type can be tested under the production line equipment and standard conditions, and then the average of the multiple capacity test values ​​of the multiple lithium iron phosphate battery cells of the same type tested by the production line equipment can be used as the capacity test value for the same type of lithium iron phosphate battery cells, and the average of the multiple standard capacities of the multiple lithium iron phosphate battery cells of the same type tested under standard conditions can be used as the standard capacity for the same type of lithium iron phosphate battery cells.

[0048] In this embodiment, the cell capacity correction curve indicates that there is a linear correlation between the capacity detection value and the standard capacity of the lithium iron phosphate cell. That is, the capacity detection value of the lithium iron phosphate cell with different capacities is used as the ordinate, and the standard capacity of the lithium iron phosphate cell with different capacities is used as the abscissa, based on which the cell capacity correction curve and the regression curve equation corresponding to the cell capacity correction curve are constructed.

[0049] Step S102: Correcting the cell capacity of the lithium iron phosphate cell, and using the cell capacity correction curve to correct the capacity detection value of any lithium iron phosphate cell detected by the production line equipment.

[0050] In this step, the capacity detection value of any lithium iron phosphate battery cell detected by the production line equipment is input into the regression curve equation, and the output result is the corrected capacity detection value.

[0051] against Figure 1 The technical solution provided by the illustrated embodiment utilizes the capacity detection values ​​of lithium iron phosphate battery cells of different capacities detected by the production line equipment and the standard capacity of lithium iron phosphate battery cells of different capacities detected under standard conditions to construct a cell capacity correction curve for lithium iron phosphate battery cells for the production line equipment. The detection temperature of the production line equipment is not correlated with the detection temperature under standard conditions. That is, the technical solution provided by the present invention utilizes the cell capacity correction curve to correct the cell capacity of any lithium iron phosphate battery cell detected by the production line equipment without paying attention to the detection temperature, thereby effectively improving the accuracy of cell capacity detection of lithium iron phosphate batteries.

[0052] In addition, based on the above-mentioned revised results, lithium iron phosphate cells with suitable cell capacity are screened for electric vehicles, so that the battery pack or battery pack group assembled based on the screened lithium iron phosphate cells has better performance, thereby effectively improving the electric performance of electric vehicles.

[0053] Furthermore, the above-mentioned method for correcting the capacity of the lithium iron phosphate battery further includes: optimizing the production line equipment and / or the testing environment by utilizing the difference between the capacity detection value of lithium iron phosphate cells of different capacities and the standard capacity of lithium iron phosphate cells of different capacities or the cell capacity correction curve. The optimization of the production line equipment and / or the testing environment may be to generate an optimization strategy based on the difference between the capacity detection value and the standard capacity or the cell capacity correction curve, and the optimization strategy indicates the optimization parameters of the production line equipment and / or the parameters of the testing environment, etc. By optimizing the production line equipment and / or the testing environment, the accuracy of the corrected capacity detection value can be further improved.

[0054] In addition, the above-mentioned method for correcting the capacity of lithium iron phosphate batteries may further include: under standard conditions, detecting the standard capacity of lithium iron phosphate cells of different capacities at multiple temperatures; and determining that temperature is not an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate cells from the standard capacity at multiple temperatures detected under standard conditions. If the process identifies that temperature is not an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate cells, then there is no need to control the detected ambient temperature in the subsequent correction process.

[0055] Furthermore, the above-mentioned method for correcting the capacity of the lithium iron phosphate battery may further include: determining the production line equipment as an influencing factor affecting the accuracy of the capacity detection of the lithium iron phosphate battery cell.

[0056] Furthermore, the above-mentioned method for correcting the capacity of the lithium iron phosphate battery may further include: outputting the corrected cell capacity for the lithium iron phosphate cells detected by the production line equipment in real time, marking the lithium iron phosphate cells with the corrected cell capacity or sorting the lithium iron phosphate cells with the corrected cell capacity.

[0057] By marking the lithium iron phosphate cells with the corrected cell capacity, it is convenient to use the lithium iron phosphate cells later and to select lithium iron phosphate cells with the same cell capacity for the battery pack.

[0058] By using the corrected cell capacity to sort the lithium iron phosphate cells, it is convenient to subsequently assemble the sorted lithium iron phosphate cells into lithium iron phosphate square batteries or assemble battery packs.

[0059] Figure 2 FIG. 2 shows a main flow chart of a method for correcting the capacity of a lithium iron phosphate battery provided in another embodiment of the present invention. Specifically, Figure 2 As shown, the method for correcting the capacity of a lithium iron phosphate battery in another embodiment may include the following steps:

[0060] Step S201: testing the standard capacity of the battery cells, testing the standard capacity of lithium iron phosphate battery cells of different capacities at multiple temperatures under standard conditions.

[0061] Exemplarily, based on this step, under standard conditions, the standard capacity of the 1# lithium iron phosphate battery cell and the standard capacity of the 2# lithium iron phosphate battery cell are tested at different temperatures, and the results are shown in Table 1 below.

[0062] Table 1

[0063] Temperature(℃) 1# Cell Capacity 2# battery cell capacity 1# Cell Capacity Ratio 2# Cell Capacity Ratio 25 81.71 81.76 100.0％ 100.0％ 30 81.45 81.54 99.7％ 99.7％ 35 81.65 81.73 99.9％ 100.0％ 40 81.65 81.74 99.9％ 100.0％ 45 81.55 81.64 99.8％ 99.8％

[0064] In order to better compare the standard capacity of lithium iron phosphate cells tested at different temperatures, the cell capacity ratio between the standard capacity of lithium iron phosphate cells at various temperatures and the cell capacity at 25°C was calculated based on the cell capacity at 25°C. Among them, C i (x) represents the standard capacity of lithium iron phosphate cell i detected at temperature x. The cell capacity ratio of 1# lithium iron phosphate cell and the cell capacity ratio of 2# lithium iron phosphate cell detected at different temperatures are shown in Table 1 above. The curve relationship between the cell capacity ratio of 1# lithium iron phosphate cell and the cell capacity ratio of 2# lithium iron phosphate cell and temperature based on Table 1 above is shown as follows: Figure 3 shown.

[0065] Step S202: Identify influencing factors, determine from the standard capacities at multiple temperatures detected under standard conditions that temperature is not an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries, and determine that the production line equipment is an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries.

[0066] from Figure 3 It can be seen that the two lithium iron phosphate cells (1# lithium iron phosphate cell and 2# lithium iron phosphate cell) have good consistency. The maximum capacity difference of lithium iron phosphate cells at different temperatures is 0.3%, and the average difference is only 0.1%. The maximum capacity difference of the same cell is 1.1%, and the average capacity difference is 0.7%, indicating that temperature is not the main factor in measuring the capacity of lithium iron phosphate cells. That is, the standard capacity of lithium iron phosphate cells with different cell capacities detected at the same temperature will not be affected by temperature. Based on this, it can be determined that temperature is not an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate cells. Therefore, it can be determined that the production line equipment is an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate cells.

[0067] Step S203: Data detection, using production line equipment to detect capacity detection values ​​of lithium iron phosphate cells of different capacities.

[0068] Exemplarily, the capacity detection values ​​of lithium iron phosphate cells of different capacities detected by the production line equipment in this step are shown in Table 2 below.

[0069] Table 2

[0070]

[0071] Under standard conditions, the standard capacity of the lithium iron phosphate batteries of different capacities is tested, and the difference between the capacity test value and the standard capacity of the lithium iron phosphate batteries of different capacities (test value-standard capacity) and the percentage of difference between the capacity test value and the standard capacity of the lithium iron phosphate batteries of different capacities ((capacity test value-standard capacity) / standard capacity) are calculated, as shown in Table 2.

[0072] It is worth noting that the detection temperature of the production line equipment in this step is not related to the detection temperature under standard conditions; that is, the detection temperature of the production line equipment in this step can be any temperature, and the detection temperature under standard conditions can also be any temperature.

[0073] Step S204: Curve construction, using the capacity detection values ​​of lithium iron phosphate batteries of different capacities detected by the production line equipment and the standard capacity of lithium iron phosphate batteries of different capacities detected under standard conditions, construct a battery capacity correction curve for lithium iron phosphate batteries for the production line equipment, and execute steps S205 and S206 respectively.

[0074] Based on the capacity detection values ​​of lithium iron phosphate cells of different capacities detected by the production line equipment in Table 2 above and the standard capacities of lithium iron phosphate cells of different capacities, a cell capacity correction curve is constructed. The constructed cell capacity correction curve is as follows: Figure 4 As shown. Among them, corresponding to Figure 4 The regression curve equation of the battery cell capacity correction curve is C j标 =5.414+0.9274×C j测 , where C j标 Indicates the standard capacity of lithium iron phosphate battery j; C j测 It indicates the capacity detection value of lithium iron phosphate battery cell j detected by the production line equipment. It is worth noting that the battery cell capacity correction curve and its corresponding regression curve equation are related to the production line equipment. Different production line equipment corresponds to different battery cell capacity correction curves and regression curve equations.

[0075] Step S205: Optimize detection, use the difference between the capacity detection value of lithium iron phosphate batteries with different capacities and the standard capacity of lithium iron phosphate batteries with different capacities or the battery capacity correction curve to optimize the production line equipment and / or the detection environment, and execute step S203.

[0076] By optimizing the production line equipment and / or the testing environment, the accuracy of the test results and correction results of the production line equipment can be further improved.

[0077] Step S206: Correcting the battery cell capacity, using the battery cell capacity correction curve to correct the capacity detection value of any lithium iron phosphate battery cell detected by the production line equipment.

[0078] For example, using Figure 4 The regression curve equation of the battery cell capacity correction curve is C j标 =5.414+0.9274×C j测 , the detection values ​​of lithium iron phosphate batteries with different capacities in Table 2 above are corrected.

[0079] Corrected results, the difference between the corrected test value and the standard capacity (corrected test value - standard capacity) and the difference percentage As shown in Table 3 below.

[0080] Comparing Table 2 with Table 3 below, it can be clearly seen that the difference between the corrected test value and the standard capacity and the difference percentage are significantly reduced. Based on this, it is explained that the technical solution provided by the embodiment of the present invention can effectively improve the accuracy of the correction result.

[0081] Table 3

[0082]

[0083] Step S207: marking the cell capacity, and outputting the corrected cell capacity for the lithium iron phosphate cells detected by the production line equipment in real time, so as to mark the lithium iron phosphate cells with the corrected cell capacity or sort the lithium iron phosphate cells with the corrected cell capacity.

[0084] Through this process, suitable lithium iron phosphate cells can be screened for electric vehicles and assembled into battery packs to improve the performance of the battery packs.

[0085] Further, Figure 5 The main flow chart of a method for identifying factors affecting the accuracy of lithium iron phosphate battery capacity measurement provided by an embodiment of the present invention is shown. Specifically, Figure 5 As shown, the impact factor identification method may include the following steps:

[0086] Step S501: testing the standard capacity of the battery cells, testing the standard capacity of lithium iron phosphate battery cells of different capacities at multiple temperatures under standard conditions.

[0087] Step S502: Identify influencing factors, determine from the standard capacities at multiple temperatures detected under standard conditions that temperature is not an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries, and determine that the production line equipment is an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries.

[0088] Through the above-mentioned method for identifying factors affecting the accuracy of lithium iron phosphate battery capacity measurement, it is determined that the production line equipment is an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries. Therefore, in the process of detecting the battery capacity of lithium iron phosphate batteries and correcting the battery capacity, there is no need to consider the temperature effect.

[0089] Further, Figure 6 FIG. 1 is a schematic diagram showing a partial structure of a device for correcting the capacity of a lithium iron phosphate battery provided by an embodiment of the present invention. Figure 6 As shown, the lithium iron phosphate battery capacity correction device 600 may include: a curve construction module 601 and a correction module 602, wherein:

[0090] The curve construction module 601 is used to construct a cell capacity correction curve for the lithium iron phosphate cell for the production line equipment by using the capacity detection values ​​of the lithium iron phosphate cells of different capacities detected by the production line equipment and the standard capacities of the lithium iron phosphate cells of different capacities detected under standard conditions, wherein the detection temperature of the production line equipment is not associated with the detection temperature under standard conditions;

[0091] The correction module 602 is used to correct the capacity detection value of any lithium iron phosphate battery cell detected by the production line equipment using the battery cell capacity correction curve.

[0092] The cell capacity correction curve constructed by the curve construction module 601 indicates that there is a linear correlation between the capacity detection value of the lithium iron phosphate cell and the standard capacity.

[0093] Furthermore, if Figure 6 As shown, the above-mentioned lithium iron phosphate battery capacity correction device 600 may further include: an optimization module 603, wherein:

[0094] The optimization module 603 is used to optimize the production line equipment and / or the detection environment by utilizing the difference between the capacity detection value of the lithium iron phosphate battery cells of different capacities and the standard capacity of the lithium iron phosphate battery cells of different capacities or the battery cell capacity correction curve.

[0095] Furthermore, if Figure 6 As shown, the above-mentioned lithium iron phosphate battery capacity correction device 600 may further include: an influencing factor identification module 604, wherein:

[0096] The influencing factor identification module 604 is used to obtain the standard capacity of lithium iron phosphate batteries with different capacities under standard conditions at multiple temperatures; from the standard capacities at multiple temperatures detected under the standard conditions, determine that temperature is not an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries, and determine that the production line equipment is an influencing factor affecting the accuracy of capacity detection of lithium iron phosphate batteries.

[0097] Furthermore, the correction module 602 is further used to output the corrected cell capacity for the lithium iron phosphate cells detected by the production line equipment in real time, so as to mark the lithium iron phosphate cells using the corrected cell capacity or sort the lithium iron phosphate cells using the corrected cell capacity.

[0098] Furthermore, an embodiment of the present invention also provides a system for correcting the capacity of a lithium iron phosphate battery. Figure 7 As shown, the lithium iron phosphate battery capacity correction system 700 may include: a test device 701 under a standard test scenario, a plurality of production line devices 702 and a lithium iron phosphate battery capacity correction device 600 provided in the above embodiment, wherein:

[0099] The test equipment 701 under the standard test scenario is used to detect the standard capacity of lithium iron phosphate cells of different capacities at multiple temperatures under standard conditions;

[0100] The production line equipment 702 is used to detect the capacity detection values ​​of lithium iron phosphate batteries of different capacities produced on the production line.

[0101] Furthermore, an embodiment of the present invention also provides an electronic device. The electronic device may include:

[0102] one or more processors;

[0103] a storage device for storing one or more programs,

[0104] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for correcting the capacity of a lithium iron phosphate battery as provided in the above embodiment.

[0105] Furthermore, an embodiment of the present invention also provides a computer-readable medium on which a computer program for a method for correcting the capacity of a lithium iron phosphate battery is stored.

[0106] When the computer program is executed by the vehicle-mounted processor, the method for correcting the capacity of the lithium iron phosphate battery provided in the above embodiment is implemented.

[0107] The following describes a technical scenario to which the technical solution provided by the embodiment of the present invention is applicable based on the system architecture on which the technical solution provided by the embodiment of the present invention relies.

[0108] Figure 8 An exemplary system architecture 800 is shown, to which a method for correcting the capacity of a lithium iron phosphate battery or an apparatus for correcting the capacity of a lithium iron phosphate battery according to an embodiment of the present invention can be applied.

[0109] like Figure 8 As shown, the system architecture 800 may include production line devices 801, 802, 803, a server 804, a terminal device 805, a printing device 806 and a communication device 807. The communication device 807 is used to provide a communication medium between the production line devices 801, 802, 803 and the server 804, between the production line devices 801, 802, 803 and the terminal device 805, between the server 804 and the printing device 806, and between the terminal device 805 and the printing device 806. The communication device 807 may include networks of various connection types, such as wired and wireless communications such as Bluetooth, infrared communication, and data line communication, and may also include a communication base station.

[0110] Among them, the production line equipment 801, 802, and 803 detect the capacity detection value of the lithium iron phosphate battery cells produced by the production line where they are located, and send the detected capacity detection value of the lithium iron phosphate battery cells to the server 804 and the terminal device 805. The server 804 stores the standard capacity of lithium iron phosphate batteries of different capacities detected under standard conditions. The server 804 performs the following operations for different production line equipment 801, 802, and 803: using the capacity detection value of lithium iron phosphate batteries of different capacities detected by the production line equipment and the standard capacity of lithium iron phosphate batteries of different capacities detected under standard conditions, constructing a battery capacity correction curve for lithium iron phosphate batteries for the production line equipment, and using the battery capacity correction curve, correcting the battery capacity of any lithium iron phosphate battery cell detected by the production line equipment. And send the corrected battery capacity to the terminal device 805 corresponding to the production line equipment and the printing device 806 corresponding to the production line equipment respectively. Among them, the server 804 can be deployed in the cloud.

[0111] Each production line device corresponds to a printing device 806, and the printing device 806 prints the corrected battery cell capacity on the shell of the corresponding lithium iron phosphate battery cell by laser.

[0112] The server 804 sends the cell capacity correction curve it constructs and the corrected capacity detection value of the lithium iron phosphate cell to the terminal device 805 corresponding to the production line equipment, and the terminal device 805 can provide the capacity detection value of the lithium iron phosphate cell corrected by the server 804 to the user. In addition, the terminal device 805 can also replace the above-mentioned server 804, and the terminal device 805 uses the cell capacity correction curve provided by the server 804 to correct the capacity detection value of the lithium iron phosphate cell detected by the production line equipment. In addition, the terminal device 805 can also use the capacity detection values ​​of lithium iron phosphate cells of different capacities provided by the production line equipment to which it is connected and the standard capacity of lithium iron phosphate cells of different capacities detected under standard conditions provided externally to construct a cell capacity correction curve for lithium iron phosphate cells, and use the cell capacity correction curve to correct the cell capacity of any lithium iron phosphate cell detected by the production line equipment. Further, in the case of correcting the cell capacity of the lithium iron phosphate cell detected by the production line equipment through the terminal device 805, the terminal device 805 sends the corrected cell capacity to the printing device 806. The printing device 806 prints the corrected cell capacity on the shell of the corresponding lithium iron phosphate cell by laser.

[0113] It should be understood that Figure 8 The number of production line devices, servers, terminal devices, printing devices, and communication devices in the figure is only for illustration. Any number of production line devices, servers, terminal devices, printing devices, and communication devices may be provided according to the implementation requirements.

[0114] Reference below Fig. 9, which shows a schematic structural diagram of a computer system 900 suitable for implementing the method for correcting the capacity of a lithium iron phosphate battery according to an embodiment of the present invention. Fig. 9 The computer system shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0115] like Fig. 9 As shown, the computer system 900 includes a central processing unit (CPU) 901, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 902 or a program loaded from a storage part 908 into a random access memory (RAM) 903. In the RAM 903, various programs and data required for the operation of the system 900 are also stored. The CPU 901, the ROM 902, and the RAM 903 are connected to each other via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0116] The following components are connected to the I / O interface 905: an input section 906 including an output section 907 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 908 including a hard disk, etc.; and a communication section 909 including a network interface card such as a LAN card, a modem, etc. The communication section 909 performs communication processing via a network such as the Internet. A drive 910 is also connected to the I / O interface 905 as needed. A removable medium 911, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 910 as needed, so that a computer program read therefrom is installed into the storage section 908 as needed.

[0117] In particular, according to the embodiments disclosed in the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 909, and / or installed from the removable medium 911. When the computer program is executed by the central processing unit (CPU) 901, the above-mentioned functions defined in the system of the present invention are executed.

[0118] It should be noted that the computer-readable medium shown in the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0119] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0120] The modules involved in the embodiments of the present invention may be implemented by software or hardware. The modules described may also be provided in a processor. For example, they may be described as: a processor including the above-mentioned curve construction module and correction module. Among them, the names of these modules or units do not constitute limitations on the modules or units themselves in certain cases. For example, the feature extraction module may also be described as "a module or unit for constructing a cell capacity correction curve for the lithium iron phosphate cell for the production line equipment."

[0121] As another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiment; or it may exist independently without being assembled into the device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by a device, the device includes: using the capacity detection values ​​of lithium iron phosphate cells of different capacities detected by the production line equipment and the standard capacity of lithium iron phosphate cells of different capacities detected under standard conditions, constructing a cell capacity correction curve for lithium iron phosphate cells for the production line equipment, wherein the detection temperature of the production line equipment is not associated with the detection temperature under standard conditions; using the cell capacity correction curve, correcting the cell capacity of any lithium iron phosphate cell detected by the production line equipment.

[0122] According to the technical solution of the embodiment of the present invention, a cell capacity correction curve for lithium iron phosphate cells is constructed for the production line equipment by utilizing the capacity detection values ​​of lithium iron phosphate cells of different capacities detected by the production line equipment and the standard capacity of lithium iron phosphate cells of different capacities detected under standard conditions. The detection temperature of the production line equipment is not correlated with the detection temperature under standard conditions. That is, the technical solution provided by the present invention uses the cell capacity correction curve to correct the cell capacity of any lithium iron phosphate cell detected by the production line equipment without paying attention to the detection temperature, thereby effectively improving the accuracy of cell capacity detection of lithium iron phosphate batteries.

[0123] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for correcting the capacity of a lithium iron phosphate battery, characterized in that: include: Using the capacity detection values ​​of lithium iron phosphate cells of different capacities detected by the production line equipment and the standard capacities of lithium iron phosphate cells of different capacities detected under standard conditions, a cell capacity correction curve for the lithium iron phosphate cells is constructed for the production line equipment, wherein the detection temperature of the production line equipment is not associated with the detection temperature under the standard conditions; The cell capacity correction curve is used to correct the capacity detection value of any lithium iron phosphate cell detected by the production line equipment.

2. The method for correcting the capacity of a lithium iron phosphate battery according to claim 1, characterized in that: The battery cell capacity correction curve indicates that the capacity detection value of the lithium iron phosphate battery cell is linearly correlated with the standard capacity.

3. The method for correcting the capacity of a lithium iron phosphate battery according to claim 1, characterized in that: Also includes: The production line equipment and / or the detection environment are optimized by utilizing the difference between the capacity detection value of the lithium iron phosphate battery cells of different capacities and the standard capacity of the lithium iron phosphate battery cells of different capacities or the battery cell capacity correction curve.

4. The method for correcting the capacity of a lithium iron phosphate battery according to any one of claims 1 to 3, characterized in that: Also includes: Under standard conditions, test the standard capacity of lithium iron phosphate cells with different capacities at multiple temperatures; From the standard capacities at multiple temperatures detected under the standard conditions, it is determined that temperature is not an influencing factor affecting the accuracy of capacity detection of the lithium iron phosphate battery cell.

5. The method for correcting the capacity of a lithium iron phosphate battery according to claim 4, characterized in that: Also includes: The production line equipment is determined as the factor affecting the capacity detection accuracy of lithium iron phosphate batteries.

6. The method for correcting the capacity of a lithium iron phosphate battery according to claim 1, characterized in that: The detection temperature is any value within the range of 25°C to 45°C.

7. The method for correcting the capacity of a lithium iron phosphate battery according to claim 1, characterized in that: Also includes: The corrected cell capacity is output in real time for the lithium iron phosphate cells detected by the production line equipment, so as to mark the lithium iron phosphate cells using the corrected cell capacity or sort the lithium iron phosphate cells using the corrected cell capacity.

8. A device for correcting the capacity of a lithium iron phosphate battery, characterized in that: include: Curve construction module and correction module, where: The curve construction module is used to construct a cell capacity correction curve for the lithium iron phosphate battery cell for the production line equipment by using the capacity detection values ​​of the lithium iron phosphate battery cells of different capacities detected by the production line equipment and the standard capacities of the lithium iron phosphate battery cells of different capacities detected under standard conditions, wherein the detection temperature of the production line equipment is not associated with the detection temperature of the standard conditions; The correction module is used to correct the cell capacity of any lithium iron phosphate cell detected by the production line equipment using the cell capacity correction curve.

9. An electronic device, characterized in that: include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method for correcting the capacity of a lithium iron phosphate battery as described in any one of claims 1 to 7 above.

10. A computer-readable medium, characterized in that A computer program for a method of correcting the capacity of a lithium iron phosphate battery is stored thereon, When the computer program is executed by a processor, the method for correcting the capacity of a lithium iron phosphate battery as described in any one of claims 1 to 7 is implemented.

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