Retired power battery gradient utilization method and system and storage medium

Abstract

The invention discloses a gradient utilization method and system for a decommissioned power battery and a storage medium. The method comprises the following steps: acquiring information of a decommissioned power battery pack; splitting the retired power battery pack to obtain a plurality of single batteries; based on a preset discharge detection device, obtaining detection data information of the battery monomers; extracting the actual capacitance of the single battery in the detection data information and feature detection data influencing the safety of the single battery; obtaining a safety coefficient value of the corresponding battery cell according to the feature detection data influencing the safety of the battery cell; and determining a secondary utilization range of the corresponding battery monomer according to the actual capacitance of the battery monomer and a preset interval range where the safety coefficient value of the corresponding battery monomer is located. According to the method, the retired power batteries are classified according to the actual capacitance and the safety coefficient value, and the positions and the use ranges of the corresponding battery monomers for secondary utilization are determined, so that the use value of the power batteries is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies, and more specifically, to a method, system and storage medium for gradient utilization of retired power batteries. Background Art

[0002] With the vigorous development of electric vehicles, the energy required for power batteries has been under pressure. At present, retired power batteries in electric vehicles are mainly processed by waste recycling, which reduces the utilization rate of power batteries and wastes the energy required for power batteries. Therefore, the present invention determines whether the corresponding retired power batteries can continue to be used by evaluating the capacity and safety factor value of retired power batteries, and transports the corresponding retired power batteries to suitable secondary utilization locations according to gradient classification. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a method, system and storage medium for gradient utilization of retired power batteries, which can improve the utilization rate of power batteries.

[0004] A first aspect of the present invention provides a method for gradient utilization of retired power batteries, comprising:

[0005] Obtain retired power battery pack information;

[0006] Disassemble the retired power battery pack to obtain multiple battery cells;

[0007] Based on the preset discharge detection device, obtain the detection data information of the battery cell;

[0008] Extracting the actual capacity of the battery cell and the characteristic detection data that affect the safety of the battery cell from the detection data information;

[0009] According to the characteristic detection data that affects the safety of the battery cell, the safety factor value of the corresponding battery cell is obtained;

[0010] The secondary utilization position of the corresponding battery cell is determined according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

[0011] In this solution, after extracting the actual capacity of the battery cell in the detection data information, the method further includes:

[0012] Obtain the displayed capacity of the battery cell;

[0013] Subtract the actual capacity from the displayed capacity of the battery cell to obtain the capacity difference of the corresponding battery cell;

[0014] Determine whether the capacity difference of the battery cells is greater than or equal to a preset capacity difference threshold, if so, remove the corresponding battery cells; if not, retain the corresponding battery cells;

[0015] The discarded battery cells are recycled as waste batteries.

[0016] In this solution, the step of obtaining the safety factor value of the corresponding battery cell according to the characteristic detection data affecting the safety of the battery cell specifically includes:

[0017] Based on battery cells in the same actual capacity range, characteristic detection data that affect the safety of the battery cells are plotted in a curve chart according to the discharge process;

[0018] Extracting the limit value in the curve, and normalizing the limit value and the maximum and minimum values ​​in the preset safety interval of the corresponding feature to obtain a normalized value of the corresponding feature;

[0019] Multiply the normalized value of the feature by the preset safety weight coefficient of the corresponding feature to obtain the safety factor ratio of the corresponding feature;

[0020] The safety factor ratios of all characteristics that affect the safety of the battery cells are accumulated to obtain the safety factor value of the corresponding battery cell.

[0021] This plan also includes:

[0022] Based on battery cells in the same actual capacity range, feature detection data affecting the safety of the battery cells are extracted and set as the affecting feature detection data;

[0023] Calculate the difference of the influencing feature detection data of the same feature of any two battery cells, and take the absolute value to obtain the influencing feature difference of the corresponding feature;

[0024] Determine whether the influencing characteristic difference of the corresponding characteristic is greater than a preset characteristic difference threshold of the corresponding characteristic, and if so, mark the two battery cells corresponding to the influencing characteristic difference once;

[0025] Get the total number of times the battery cell is marked;

[0026] According to the total number of times the battery cells are marked, a maximum value among the total number of times the battery cells are marked is obtained;

[0027] Determine whether the maximum value of the total number of times the battery cell is marked is greater than a preset marking number threshold. If so, send the corresponding battery cell to a preset battery cell backup library for storage, and adjust the total number of times other battery cells are marked to obtain the total number of times the marking of other battery cells after adjustment, until the maximum value of the total number of times the marking of other battery cells after adjustment is less than or equal to the preset marking number threshold.

[0028] This plan also includes:

[0029] According to the retired power battery pack information, the working time value of the battery cell and the initial capacity of the battery cell are obtained;

[0030] Subtract the actual capacity of the battery cell from the initial capacity of the battery cell to obtain the loss capacity of the battery cell;

[0031] Dividing the loss capacity of the battery cell by the working time value of the battery cell to obtain the capacity loss rate of the corresponding battery cell;

[0032] It is determined whether the capacity loss rate of the battery cell is greater than a preset capacity loss rate threshold, and if so, the corresponding battery cell is removed.

[0033] In this solution, the step of determining the secondary utilization position of the corresponding battery cell according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell specifically includes:

[0034] Based on a preset capacity base, the capacity of the battery cell is divided into a plurality of capacity interval ranges;

[0035] According to the capacity interval range into which the actual capacity of the battery cell falls, the actual capacity level of the corresponding battery cell is obtained;

[0036] Based on the preset safety factor base, the safety factor value is divided into multiple safety factor interval ranges;

[0037] According to the safety factor interval range that the safety factor value of the battery cell falls into, the safety factor value level of the corresponding battery cell is obtained;

[0038] Obtaining the secondary utilization location of the power battery and the demand information of the power battery capacity level and safety factor value level corresponding to the secondary utilization location;

[0039] When the actual capacity level of the battery cell is greater than or equal to the capacity level in the demand information, and the safety factor value level of the battery cell is greater than or equal to the safety factor value level in the demand information, the secondary utilization position of the corresponding battery cell is obtained.

[0040] A second aspect of the present invention provides a retired power battery gradient utilization system, comprising a memory and a processor, wherein the memory stores a retired power battery gradient utilization method program, and when the retired power battery gradient utilization method program is executed by the processor, the following steps are implemented:

[0041] Obtain retired power battery pack information;

[0042] Disassemble the retired power battery pack to obtain multiple battery cells;

[0043] Based on the preset discharge detection device, obtain the detection data information of the battery cell;

[0044] Extracting the actual capacity of the battery cell and the characteristic detection data that affect the safety of the battery cell from the detection data information;

[0045] According to the characteristic detection data that affects the safety of the battery cell, the safety factor value of the corresponding battery cell is obtained;

[0046] The secondary utilization position of the corresponding battery cell is determined according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

[0047] In this solution, after extracting the actual capacity of the battery cell in the detection data information, the method further includes:

[0048] Obtain the displayed capacity of the battery cell;

[0049] Subtract the actual capacity from the displayed capacity of the battery cell to obtain the capacity difference of the corresponding battery cell;

[0050] Determine whether the capacity difference of the battery cells is greater than or equal to a preset capacity difference threshold, if so, remove the corresponding battery cells; if not, retain the corresponding battery cells;

[0051] The discarded battery cells are recycled as waste batteries.

[0052] In this solution, the step of obtaining the safety factor value of the corresponding battery cell according to the characteristic detection data affecting the safety of the battery cell specifically includes:

[0053] Based on battery cells in the same actual capacity range, characteristic detection data that affect the safety of the battery cells are plotted in a curve chart according to the discharge process;

[0054] Extracting the limit value in the curve, and normalizing the limit value and the maximum and minimum values ​​in the preset safety interval of the corresponding feature to obtain a normalized value of the corresponding feature;

[0055] Multiply the normalized value of the feature by the preset safety weight coefficient of the corresponding feature to obtain the safety factor ratio of the corresponding feature;

[0056] The safety factor ratios of all characteristics that affect the safety of the battery cells are accumulated to obtain the safety factor value of the corresponding battery cell.

[0057] This plan also includes:

[0058] Based on battery cells in the same actual capacity range, feature detection data affecting the safety of the battery cells are extracted and set as the affecting feature detection data;

[0059] Calculate the difference of the influencing feature detection data of the same feature of any two battery cells, and take the absolute value to obtain the influencing feature difference of the corresponding feature;

[0060] Determine whether the influencing characteristic difference of the corresponding characteristic is greater than a preset characteristic difference threshold of the corresponding characteristic, and if so, mark the two battery cells corresponding to the influencing characteristic difference once;

[0061] Get the total number of times the battery cell is marked;

[0062] According to the total number of times the battery cells are marked, a maximum value among the total number of times the battery cells are marked is obtained;

[0063] Determine whether the maximum value of the total number of times the battery cell is marked is greater than a preset marking number threshold. If so, send the corresponding battery cell to a preset battery cell backup library for storage, and adjust the total number of times other battery cells are marked to obtain the total number of times the marking of other battery cells after adjustment, until the maximum value of the total number of times the marking of other battery cells after adjustment is less than or equal to the preset marking number threshold.

[0064] This plan also includes:

[0065] According to the retired power battery pack information, the working time value of the battery cell and the initial capacity of the battery cell are obtained;

[0066] Subtract the actual capacity of the battery cell from the initial capacity of the battery cell to obtain the loss capacity of the battery cell;

[0067] Dividing the loss capacity of the battery cell by the working time value of the battery cell to obtain the capacity loss rate of the corresponding battery cell;

[0068] It is determined whether the capacity loss rate of the battery cell is greater than a preset capacity loss rate threshold, and if so, the corresponding battery cell is removed.

[0069] In this solution, the step of determining the secondary utilization position of the corresponding battery cell according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell specifically includes:

[0070] Based on a preset capacity base, the capacity of the battery cell is divided into a plurality of capacity interval ranges;

[0071] According to the capacity interval range into which the actual capacity of the battery cell falls, the actual capacity level of the corresponding battery cell is obtained;

[0072] Based on the preset safety factor base, the safety factor value is divided into multiple safety factor interval ranges;

[0073] According to the safety factor interval range that the safety factor value of the battery cell falls into, the safety factor value level of the corresponding battery cell is obtained;

[0074] Obtaining the secondary utilization location of the power battery and the demand information of the power battery capacity level and safety factor value level corresponding to the secondary utilization location;

[0075] When the actual capacity level of the battery cell is greater than or equal to the capacity level in the demand information, and the safety factor value level of the battery cell is greater than or equal to the safety factor value level in the demand information, the secondary utilization position of the corresponding battery cell is obtained.

[0076] A third aspect of the present invention provides a computer-readable storage medium, in which a retired power battery gradient utilization method program is stored. When the retired power battery gradient utilization method program is executed by a processor, the steps of the retired power battery gradient utilization method as described in any one of the above are implemented.

[0077] The present invention discloses a method, system and storage medium for gradient utilization of retired power batteries, which improves the use value of the power batteries by classifying retired power batteries according to actual capacity and safety factor values, determining the location and scope of use of the corresponding battery cells that can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 A flow chart showing a method for gradient utilization of retired power batteries according to the present invention is shown;

[0079] Figure 2 A block diagram of a retired power battery gradient utilization system of the present invention is shown. DETAILED DESCRIPTION

[0080] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0081] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0082] Figure 1 A flow chart of a method for gradient utilization of retired power batteries according to the present invention is shown.

[0083] like Figure 1 As shown, the present invention discloses a gradient utilization method of retired power batteries, comprising:

[0084] S101, obtaining retired power battery pack information;

[0085] S102, disassembling the retired power battery pack to obtain a plurality of battery cells;

[0086] S103, obtaining detection data information of the battery cell based on a preset discharge detection device;

[0087] S104, extracting the actual capacity of the battery cell and characteristic detection data that affect the safety of the battery cell from the detection data information;

[0088] S105, obtaining a safety factor value of a corresponding battery cell according to characteristic detection data affecting the safety of the battery cell;

[0089] S106, determining a secondary utilization position of the corresponding battery cell according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

[0090] According to an embodiment of the present invention, the power battery pack is composed of a plurality of battery cells. When an electric vehicle collides, the power battery pack in the corresponding electric vehicle may be partially damaged, and the corresponding power battery pack cannot be used any more. The corresponding power battery pack will be forced to retire to obtain a retired power battery pack. Or, for example, the capacity of the power battery pack in the electric vehicle is above 80%. When the capacity is lower than 80%, the power battery pack in the power vehicle needs to be replaced. Although the power battery pack in the corresponding electric vehicle cannot meet the needs of the electric vehicle, the power battery pack with a capacity lower than 80% can still be used for electricity storage and the like. Therefore, the battery cell is divided according to the actual capacity of the battery cell and the safety factor value of the corresponding battery cell to obtain the actual capacity level and the safety factor value level of the corresponding battery cell, and the secondary utilization position of the retired power battery is determined according to the corresponding level number.

[0091] According to an embodiment of the present invention, after extracting the actual capacity of the battery cell in the detection data information, the method further includes:

[0092] Obtain the displayed capacity of the battery cell;

[0093] Subtract the actual capacity from the displayed capacity of the battery cell to obtain the capacity difference of the corresponding battery cell;

[0094] Determine whether the capacity difference of the battery cells is greater than or equal to a preset capacity difference threshold, if so, remove the corresponding battery cells; if not, retain the corresponding battery cells;

[0095] The discarded battery cells are recycled as waste batteries.

[0096] It should be noted that when the capacitance difference between the displayed capacitance and the actual capacitance of a battery cell is greater than or equal to a preset capacitance difference threshold, it indicates that the corresponding battery cell may have leakage or display errors. Therefore, the corresponding battery cell is urgently removed to improve the safety performance of the power battery pack composed of battery cells.

[0097] According to an embodiment of the present invention, the step of obtaining the safety factor value of the corresponding battery cell according to the characteristic detection data affecting the safety of the battery cell specifically includes:

[0098] Based on battery cells in the same actual capacity range, characteristic detection data that affect the safety of the battery cells are plotted in a curve chart according to the discharge process;

[0099] Extracting the limit value in the curve, and normalizing the limit value and the maximum and minimum values ​​in the preset safety interval of the corresponding feature to obtain a normalized value of the corresponding feature;

[0100] Multiply the normalized value of the feature by the preset safety weight coefficient of the corresponding feature to obtain the safety factor ratio of the corresponding feature;

[0101] The safety factor ratios of all characteristics that affect the safety of the battery cells are accumulated to obtain the safety factor value of the corresponding battery cell.

[0102] It should be noted that the limit values ​​in the curve include maximum values ​​and minimum values. When the feature detection data corresponding to the curve is larger, the influence on the safety factor value is greater. The maximum value in the curve and the maximum and minimum values ​​of the preset safety interval of the corresponding feature are taken for normalization calculation; when the feature detection data corresponding to the curve is smaller, the influence on the safety factor value is greater. The minimum value in the curve and the maximum and minimum values ​​of the preset safety interval of the corresponding feature are taken for normalization calculation. The maximum value or minimum value in the limit value is subtracted from the minimum value in the preset safety interval to obtain a first value; the maximum value in the preset safety interval is subtracted from the minimum value to obtain a second value; the first value is divided by the second value and the absolute value is taken to obtain the normalized value of the feature corresponding to the curve; the cumulative value of the preset safety weight coefficients of all features is 1.

[0103] According to an embodiment of the present invention, it also includes:

[0104] Based on battery cells in the same actual capacity range, feature detection data affecting the safety of the battery cells are extracted and set as the affecting feature detection data;

[0105] Calculate the difference of the influencing feature detection data of the same feature of any two battery cells, and take the absolute value to obtain the influencing feature difference of the corresponding feature;

[0106] Determine whether the influencing characteristic difference of the corresponding characteristic is greater than a preset characteristic difference threshold of the corresponding characteristic, and if so, mark the two battery cells corresponding to the influencing characteristic difference once;

[0107] Get the total number of times the battery cell is marked;

[0108] According to the total number of times the battery cells are marked, a maximum value among the total number of times the battery cells are marked is obtained;

[0109] Determine whether the maximum value of the total number of times the battery cell is marked is greater than a preset marking number threshold. If so, send the corresponding battery cell to a preset battery cell backup library for storage, and adjust the total number of times other battery cells are marked to obtain the total number of times the marking of other battery cells after adjustment, until the maximum value of the total number of times the marking of other battery cells after adjustment is less than or equal to the preset marking number threshold.

[0110] It should be noted that the characteristic detection data that affects the safety of battery cells include the temperature value of the battery cell power supply heat, the stability and size of the discharge, etc. For example, the temperature value of the battery cell power supply heat, if there is too much difference in the temperature values ​​between the battery cells, will affect the power supply stability of the battery cell, the life of the battery cell, etc.; for example, if the total number of times battery cell a is marked is the largest, and the total number of times the corresponding battery cell a is marked is greater than the preset marking number threshold, the corresponding battery cell a will be eliminated and sent to the preset battery cell spare library for storage; after the battery cell a is eliminated, the marks of other related battery cells that affect the characteristic difference calculation with the battery cell a will be deleted, such as If the total number of times battery cell b is marked is 3 times, and the influencing characteristic difference value of the corresponding characteristics of battery cell b and battery cell a is greater than the preset characteristic difference threshold of the corresponding characteristic, then the total number of times the corresponding battery cell b is marked is reduced by one, and the same is true for other battery cells to obtain the total number of times marked of other battery cells after adjustment. If the total number of times marked of other battery cells after adjustment is still greater than the preset characteristic difference threshold of the corresponding characteristic, then the maximum value of the total number of times marked of other battery cells after adjustment is extracted and deleted. After deletion, the total number of times marked of the remaining other battery cells is adjusted until the maximum value of the total number of times marked of other battery cells after adjustment is less than or equal to the preset number of times marked threshold.

[0111] According to an embodiment of the present invention, it also includes:

[0112] According to the retired power battery pack information, the working time value of the battery cell and the initial capacity of the battery cell are obtained;

[0113] Subtract the actual capacity of the battery cell from the initial capacity of the battery cell to obtain the loss capacity of the battery cell;

[0114] Dividing the loss capacity of the battery cell by the working time value of the battery cell to obtain the capacity loss rate of the corresponding battery cell;

[0115] It is determined whether the capacity loss rate of the battery cell is greater than a preset capacity loss rate threshold, and if so, the corresponding battery cell is removed.

[0116] It should be noted that the preset capacity loss rate threshold is the normal capacity loss rate of the power battery pack when used under normal conditions. When the capacity loss rate of a battery cell is greater than the preset capacity loss rate threshold, it indicates that an illegal working environment exists in the corresponding battery cell, and the illegal working environment may cause other potential damages to the battery cell. Therefore, the corresponding battery cell will be eliminated.

[0117] According to an embodiment of the present invention, the step of determining the secondary utilization position of the corresponding battery cell according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell specifically includes:

[0118] Based on a preset capacity base, the capacity of the battery cell is divided into a plurality of capacity interval ranges;

[0119] According to the capacity interval range into which the actual capacity of the battery cell falls, the actual capacity level of the corresponding battery cell is obtained;

[0120] Based on the preset safety factor base, the safety factor value is divided into multiple safety factor interval ranges;

[0121] According to the safety factor interval range that the safety factor value of the battery cell falls into, the safety factor value level of the corresponding battery cell is obtained;

[0122] Obtaining the secondary utilization location of the power battery and the demand information of the power battery capacity level and safety factor value level corresponding to the secondary utilization location;

[0123] When the actual capacity level of the battery cell is greater than or equal to the capacity level in the demand information, and the safety factor value level of the battery cell is greater than or equal to the safety factor value level in the demand information, the secondary utilization position of the corresponding battery cell is obtained.

[0124] It should be noted that, for example, if the preset capacity base is 1000 mAh, then each interval of 1000 mAh is a capacity interval range; for example, if the preset safety factor base is 0.1, then each interval of 0.1 is a safety factor interval range, and the capacity interval range and the safety factor interval range are arbitrarily combined to obtain gradients of various battery cells; at the same time, the different demands of the secondary utilization position for the battery cells are divided into different gradient demands to obtain the gradient demand of the secondary utilization position, and then the gradient of the battery cell is matched with the gradient demand of the secondary utilization position, where if the gradient of the battery cell is greater than the gradient demand of the secondary utilization position, the corresponding battery cell meets the demand of the secondary utilization position.

[0125] According to an embodiment of the present invention, it also includes:

[0126] Obtain the quantity of battery cells in a preset battery cell reserve library;

[0127] Determine whether the number of battery cells in the preset battery cell backup library is greater than a preset first number threshold, and if so, re-discharge the battery cells in the corresponding preset battery cell backup library to obtain secondary detection data information of the battery cells;

[0128] The battery cells in the preset battery cell reserve library are matched with secondary utilization positions according to the secondary detection data information of the battery cells.

[0129] It should be noted that, when the number of battery cells in a preset battery cell backup library is greater than a preset first number threshold, the battery cells in the preset battery cell backup library are given a second opportunity to match the secondary utilization position. The step of giving the battery cells in the preset battery cell backup library a second opportunity to match the secondary utilization position is consistent with the method of matching the battery cells for the first time for the secondary utilization position. The method of matching the battery cells for the first time for the secondary utilization position is a method of determining the secondary utilization position of the corresponding battery cell based on the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

[0130] According to an embodiment of the present invention, it also includes:

[0131] After the battery cell is sent to the preset battery cell backup library, the time value of the corresponding battery cell stored in the preset battery cell backup library is recorded;

[0132] It is determined whether the storage time value of the battery cell in the preset battery cell reserve library corresponds to the preset storage time threshold of the battery cell. If so, the corresponding battery cell is treated as a waste battery for recycling.

[0133] It should be noted that the preset storage time threshold is in direct proportion to the actual capacity of the battery cell. When the battery cell is stored in the preset battery cell reserve library, the corresponding battery cell will continue to be depleted as the storage time increases.

[0134] According to an embodiment of the present invention, it also includes:

[0135] When there are multiple secondary utilization locations for a battery cell, the historical value created by the historical battery cell at the corresponding secondary utilization location is obtained;

[0136] Based on a preset value evaluation terminal, obtaining an evaluation value of a battery cell corresponding to a secondary utilization position;

[0137] The historical value created by the historical battery cell at the corresponding secondary utilization position is divided by the assessed value of the battery cell at the corresponding secondary utilization position to obtain the cost performance value of the corresponding battery cell at the secondary utilization position;

[0138] Compare and analyze the cost-effectiveness of different secondary utilization locations to obtain the secondary utilization location with the highest cost-effectiveness;

[0139] The secondary utilization position with the highest cost performance value is set as the secondary utilization position of the corresponding battery cell.

[0140] It should be noted that when a battery cell has multiple secondary utilization positions, the secondary utilization positions are sorted according to the cost performance values ​​created by the historical battery cells, and the secondary utilization position with the highest cost performance value is given priority.

[0141] Figure 2 A block diagram of a retired power battery gradient utilization system of the present invention is shown.

[0142] like Figure 2 As shown, the second aspect of the present invention provides a retired power battery gradient utilization system 2, including a memory 21 and a processor 22, wherein the memory stores a retired power battery gradient utilization method program, and the retired power battery gradient utilization method program is executed by the processor to implement the following steps:

[0143] Obtain retired power battery pack information;

[0144] Disassemble the retired power battery pack to obtain multiple battery cells;

[0145] Based on the preset discharge detection device, obtain the detection data information of the battery cell;

[0146] Extracting the actual capacity of the battery cell and the characteristic detection data that affect the safety of the battery cell from the detection data information;

[0147] According to the characteristic detection data that affects the safety of the battery cell, the safety factor value of the corresponding battery cell is obtained;

[0148] The secondary utilization position of the corresponding battery cell is determined according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

[0149] According to an embodiment of the present invention, the power battery pack is composed of a plurality of battery cells. When an electric vehicle collides, the power battery pack in the corresponding electric vehicle may be partially damaged, and the corresponding power battery pack cannot be used any more. The corresponding power battery pack will be forced to retire to obtain a retired power battery pack. Or, for example, the capacity of the power battery pack in the electric vehicle is above 80%. When the capacity is lower than 80%, the power battery pack in the power vehicle needs to be replaced. Although the power battery pack in the corresponding electric vehicle cannot meet the needs of the electric vehicle, the power battery pack with a capacity lower than 80% can still be used for electricity storage and the like. Therefore, the battery cell is divided according to the actual capacity of the battery cell and the safety factor value of the corresponding battery cell to obtain the actual capacity level and the safety factor value level of the corresponding battery cell, and the secondary utilization position of the retired power battery is determined according to the corresponding level number.

[0150] According to an embodiment of the present invention, after extracting the actual capacity of the battery cell in the detection data information, the method further includes:

[0151] Obtain the displayed capacity of the battery cell;

[0152] Subtract the actual capacity from the displayed capacity of the battery cell to obtain the capacity difference of the corresponding battery cell;

[0153] Determine whether the capacity difference of the battery cells is greater than or equal to a preset capacity difference threshold, if so, remove the corresponding battery cells; if not, retain the corresponding battery cells;

[0154] The discarded battery cells are recycled as waste batteries.

[0155] It should be noted that when the capacitance difference between the displayed capacitance and the actual capacitance of a battery cell is greater than or equal to a preset capacitance difference threshold, it indicates that the corresponding battery cell may have leakage or display errors. Therefore, the corresponding battery cell is urgently removed to improve the safety performance of the power battery pack composed of battery cells.

[0156] According to an embodiment of the present invention, the step of obtaining the safety factor value of the corresponding battery cell according to the characteristic detection data affecting the safety of the battery cell specifically includes:

[0157] Based on battery cells in the same actual capacity range, characteristic detection data that affect the safety of the battery cells are plotted in a curve chart according to the discharge process;

[0158] Extracting the limit value in the curve, and normalizing the limit value and the maximum and minimum values ​​in the preset safety interval of the corresponding feature to obtain a normalized value of the corresponding feature;

[0159] Multiply the normalized value of the feature by the preset safety weight coefficient of the corresponding feature to obtain the safety factor ratio of the corresponding feature;

[0160] The safety factor ratios of all characteristics that affect the safety of the battery cells are accumulated to obtain the safety factor value of the corresponding battery cell.

[0161] It should be noted that the limit values ​​in the curve include maximum values ​​and minimum values. When the feature detection data corresponding to the curve is larger, the influence on the safety factor value is greater. The maximum value in the curve and the maximum and minimum values ​​of the preset safety interval of the corresponding feature are taken for normalization calculation; when the feature detection data corresponding to the curve is smaller, the influence on the safety factor value is greater. The minimum value in the curve and the maximum and minimum values ​​of the preset safety interval of the corresponding feature are taken for normalization calculation. The maximum value or minimum value in the limit value is subtracted from the minimum value in the preset safety interval to obtain a first value; the maximum value in the preset safety interval is subtracted from the minimum value to obtain a second value; the first value is divided by the second value and the absolute value is taken to obtain the normalized value of the feature corresponding to the curve; the cumulative value of the preset safety weight coefficients of all features is 1.

[0162] According to an embodiment of the present invention, it also includes:

[0163] Based on battery cells in the same actual capacity range, feature detection data affecting the safety of the battery cells are extracted and set as the affecting feature detection data;

[0164] Calculate the difference of the influencing feature detection data of the same feature of any two battery cells, and take the absolute value to obtain the influencing feature difference of the corresponding feature;

[0165] Determine whether the influencing characteristic difference of the corresponding characteristic is greater than a preset characteristic difference threshold of the corresponding characteristic, and if so, mark the two battery cells corresponding to the influencing characteristic difference once;

[0166] Get the total number of times the battery cell is marked;

[0167] According to the total number of times the battery cells are marked, a maximum value among the total number of times the battery cells are marked is obtained;

[0168] Determine whether the maximum value of the total number of times the battery cell is marked is greater than a preset marking number threshold. If so, send the corresponding battery cell to a preset battery cell backup library for storage, and adjust the total number of times other battery cells are marked to obtain the total number of times the marking of other battery cells after adjustment, until the maximum value of the total number of times the marking of other battery cells after adjustment is less than or equal to the preset marking number threshold.

[0169] It should be noted that the characteristic detection data that affects the safety of battery cells include the temperature value of the battery cell power supply heat, the stability and size of the discharge, etc. For example, the temperature value of the battery cell power supply heat, if there is too much difference in the temperature values ​​between the battery cells, will affect the power supply stability of the battery cell, the life of the battery cell, etc.; for example, if the total number of times battery cell a is marked is the largest, and the total number of times the corresponding battery cell a is marked is greater than the preset marking number threshold, the corresponding battery cell a will be eliminated and sent to the preset battery cell spare library for storage; after the battery cell a is eliminated, the marks of other related battery cells that affect the characteristic difference calculation with the battery cell a will be deleted, such as If the total number of times battery cell b is marked is 3 times, and the influencing characteristic difference value of the corresponding characteristics of battery cell b and battery cell a is greater than the preset characteristic difference threshold of the corresponding characteristic, then the total number of times the corresponding battery cell b is marked is reduced by one, and the same is true for other battery cells to obtain the total number of times marked of other battery cells after adjustment. If the total number of times marked of other battery cells after adjustment is still greater than the preset characteristic difference threshold of the corresponding characteristic, then the maximum value of the total number of times marked of other battery cells after adjustment is extracted and deleted. After deletion, the total number of times marked of the remaining other battery cells is adjusted until the maximum value of the total number of times marked of other battery cells after adjustment is less than or equal to the preset number of times marked threshold.

[0170] According to an embodiment of the present invention, it also includes:

[0171] According to the retired power battery pack information, the working time value of the battery cell and the initial capacity of the battery cell are obtained;

[0172] Subtract the actual capacity of the battery cell from the initial capacity of the battery cell to obtain the loss capacity of the battery cell;

[0173] Dividing the loss capacity of the battery cell by the working time value of the battery cell to obtain the capacity loss rate of the corresponding battery cell;

[0174] It is determined whether the capacity loss rate of the battery cell is greater than a preset capacity loss rate threshold, and if so, the corresponding battery cell is removed.

[0175] It should be noted that the preset capacity loss rate threshold is the normal capacity loss rate of the power battery pack when used under normal conditions. When the capacity loss rate of a battery cell is greater than the preset capacity loss rate threshold, it indicates that an illegal working environment exists in the corresponding battery cell, and the illegal working environment may cause other potential damages to the battery cell. Therefore, the corresponding battery cell will be eliminated.

[0176] According to an embodiment of the present invention, the step of determining the secondary utilization position of the corresponding battery cell according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell specifically includes:

[0177] Based on a preset capacity base, the capacity of the battery cell is divided into a plurality of capacity interval ranges;

[0178] According to the capacity interval range into which the actual capacity of the battery cell falls, the actual capacity level of the corresponding battery cell is obtained;

[0179] Based on the preset safety factor base, the safety factor value is divided into multiple safety factor interval ranges;

[0180] According to the safety factor interval range that the safety factor value of the battery cell falls into, the safety factor value level of the corresponding battery cell is obtained;

[0181] Obtaining the secondary utilization location of the power battery and the demand information of the power battery capacity level and safety factor value level corresponding to the secondary utilization location;

[0182] When the actual capacity level of the battery cell is greater than or equal to the capacity level in the demand information, and the safety factor value level of the battery cell is greater than or equal to the safety factor value level in the demand information, the secondary utilization position of the corresponding battery cell is obtained.

[0183] It should be noted that, for example, if the preset capacity base is 1000 mAh, then each interval of 1000 mAh is a capacity interval range; for example, if the preset safety factor base is 0.1, then each interval of 0.1 is a safety factor interval range, and the capacity interval range and the safety factor interval range are arbitrarily combined to obtain gradients of various battery cells; at the same time, the different demands of the secondary utilization position for the battery cells are divided into different gradient demands to obtain the gradient demand of the secondary utilization position, and then the gradient of the battery cell is matched with the gradient demand of the secondary utilization position, where if the gradient of the battery cell is greater than the gradient demand of the secondary utilization position, the corresponding battery cell meets the demand of the secondary utilization position.

[0184] According to an embodiment of the present invention, it also includes:

[0185] Obtain the quantity of battery cells in a preset battery cell reserve library;

[0186] Determine whether the number of battery cells in the preset battery cell backup library is greater than a preset first number threshold, and if so, re-discharge the battery cells in the corresponding preset battery cell backup library to obtain secondary detection data information of the battery cells;

[0187] The battery cells in the preset battery cell reserve library are matched with secondary utilization positions according to the secondary detection data information of the battery cells.

[0188] It should be noted that, when the number of battery cells in a preset battery cell backup library is greater than a preset first number threshold, the battery cells in the preset battery cell backup library are given a second opportunity to match the secondary utilization position. The step of giving the battery cells in the preset battery cell backup library a second opportunity to match the secondary utilization position is consistent with the method of matching the battery cells for the first time for the secondary utilization position. The method of matching the battery cells for the first time for the secondary utilization position is a method of determining the secondary utilization position of the corresponding battery cell based on the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

[0189] According to an embodiment of the present invention, it also includes:

[0190] After the battery cell is sent to the preset battery cell backup library, the time value of the corresponding battery cell stored in the preset battery cell backup library is recorded;

[0191] It is determined whether the storage time value of the battery cell in the preset battery cell reserve library corresponds to the preset storage time threshold of the battery cell. If so, the corresponding battery cell is treated as a waste battery for recycling.

[0192] It should be noted that the preset storage time threshold is in direct proportion to the actual capacity of the battery cell. When the battery cell is stored in the preset battery cell reserve library, the corresponding battery cell will continue to be depleted as the storage time increases.

[0193] According to an embodiment of the present invention, it also includes:

[0194] When there are multiple secondary utilization locations for a battery cell, the historical value created by the historical battery cell at the corresponding secondary utilization location is obtained;

[0195] Based on a preset value evaluation terminal, obtaining an evaluation value of a battery cell corresponding to a secondary utilization position;

[0196] The historical value created by the historical battery cell at the corresponding secondary utilization position is divided by the assessed value of the battery cell at the corresponding secondary utilization position to obtain the cost performance value of the corresponding battery cell at the secondary utilization position;

[0197] Compare and analyze the cost-effectiveness of different secondary utilization locations to obtain the secondary utilization location with the highest cost-effectiveness;

[0198] The secondary utilization position with the highest cost performance value is set as the secondary utilization position of the corresponding battery cell.

[0199] It should be noted that when a battery cell has multiple secondary utilization positions, the secondary utilization positions are sorted according to the cost performance values ​​created by the historical battery cells, and the secondary utilization position with the highest cost performance value is given priority.

[0200] A third aspect of the present invention provides a computer-readable storage medium, in which a retired power battery gradient utilization method program is stored. When the retired power battery gradient utilization method program is executed by a processor, the steps of the retired power battery gradient utilization method as described in any one of the above are implemented.

[0201] The present invention discloses a method, system and storage medium for gradient utilization of retired power batteries, wherein the method includes: obtaining retired power battery pack information; disassembling the retired power battery pack to obtain multiple battery cells; obtaining detection data information of the battery cells based on a preset discharge detection device; extracting the actual capacity of the battery cells and the characteristic detection data that affects the safety of the battery cells in the detection data information; obtaining the safety factor value of the corresponding battery cells according to the characteristic detection data that affects the safety of the battery cells; determining the secondary utilization range of the corresponding battery cells according to the actual capacity of the battery cells and the preset interval range of the safety factor value of the corresponding battery cells. The present invention improves the use value of the power battery by classifying retired power batteries according to the actual capacity and safety factor value, determining the location and use range of the corresponding battery cells that can be secondary utilized.

[0202] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0203] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; 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 present embodiment.

[0204] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0205] Those skilled in the art can understand that: all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiments; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), disks or optical disks, and other media that can store program codes.

[0206] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

Claims

1. A method for gradient utilization of retired power batteries, characterized in that: include: Obtain retired power battery pack information; Disassemble the retired power battery pack to obtain multiple battery cells; Based on the preset discharge detection device, obtain the detection data information of the battery cell; Extracting the actual capacity of the battery cell and the characteristic detection data that affect the safety of the battery cell from the detection data information; According to the characteristic detection data that affects the safety of the battery cell, the safety factor value of the corresponding battery cell is obtained; The secondary utilization position of the corresponding battery cell is determined according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

2. A method for gradient utilization of retired power batteries according to claim 1, characterized in that: After extracting the actual capacity of the battery cell in the detection data information, the method further includes: Obtain the displayed capacity of the battery cell; Subtract the actual capacity from the displayed capacity of the battery cell to obtain the capacity difference of the corresponding battery cell; Determine whether the capacity difference of the battery cells is greater than or equal to a preset capacity difference threshold, if so, remove the corresponding battery cells; if not, retain the corresponding battery cells; The discarded battery cells are recycled as waste batteries.

3. A method for gradient utilization of retired power batteries according to claim 1, characterized in that: The step of obtaining the safety factor value of the corresponding battery cell according to the characteristic detection data affecting the safety of the battery cell specifically includes: Based on battery cells in the same actual capacity range, characteristic detection data that affect the safety of the battery cells are plotted in a curve chart according to the discharge process; Extracting the limit value in the curve, and normalizing the limit value and the maximum and minimum values ​​in the preset safety interval of the corresponding feature to obtain a normalized value of the corresponding feature; Multiply the normalized value of the feature by the preset safety weight coefficient of the corresponding feature to obtain the safety factor ratio of the corresponding feature; The safety factor ratios of all characteristics that affect the safety of the battery cells are accumulated to obtain the safety factor value of the corresponding battery cell.

4. A method for gradient utilization of retired power batteries according to claim 3, characterized in that: Also includes: Based on battery cells in the same actual capacity range, feature detection data affecting the safety of the battery cells are extracted and set as the affecting feature detection data; Calculate the difference of the influencing feature detection data of the same feature of any two battery cells, and take the absolute value to obtain the influencing feature difference of the corresponding feature; Determine whether the influencing characteristic difference of the corresponding characteristic is greater than a preset characteristic difference threshold of the corresponding characteristic, and if so, mark the two battery cells corresponding to the influencing characteristic difference once; Get the total number of times the battery cell is marked; According to the total number of times the battery cells are marked, a maximum value among the total number of times the battery cells are marked is obtained; Determine whether the maximum value of the total number of times the battery cell is marked is greater than a preset marking number threshold. If so, send the corresponding battery cell to a preset battery cell backup library for storage, and adjust the total number of times other battery cells are marked to obtain the total number of times the marking of other battery cells after adjustment, until the maximum value of the total number of times the marking of other battery cells after adjustment is less than or equal to the preset marking number threshold.

5. The method for gradient utilization of retired power batteries according to claim 1, characterized in that: Also includes: According to the retired power battery pack information, the working time value of the battery cell and the initial capacity of the battery cell are obtained; Subtract the actual capacity of the battery cell from the initial capacity of the battery cell to obtain the loss capacity of the battery cell; Dividing the loss capacity of the battery cell by the working time value of the battery cell to obtain the capacity loss rate of the corresponding battery cell; It is determined whether the capacity loss rate of the battery cell is greater than a preset capacity loss rate threshold, and if so, the corresponding battery cell is removed.

6. A method for gradient utilization of retired power batteries according to claim 1, characterized in that: The step of determining the secondary utilization position of the corresponding battery cell according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell specifically includes: Based on a preset capacity base, the capacity of the battery cell is divided into a plurality of capacity interval ranges; According to the capacity interval range into which the actual capacity of the battery cell falls, the actual capacity level of the corresponding battery cell is obtained; Based on the preset safety factor base, the safety factor value is divided into multiple safety factor interval ranges; According to the safety factor interval range that the safety factor value of the battery cell falls into, the safety factor value level of the corresponding battery cell is obtained; Obtaining the secondary utilization location of the power battery and the demand information of the power battery capacity level and safety factor value level corresponding to the secondary utilization location; When the actual capacity level of the battery cell is greater than or equal to the capacity level in the demand information, and the safety factor value level of the battery cell is greater than or equal to the safety factor value level in the demand information, the secondary utilization position of the corresponding battery cell is obtained.

7. A retired power battery gradient utilization system, characterized in that: The invention comprises a memory and a processor, wherein a retired power battery gradient utilization method program is stored in the memory, and the retired power battery gradient utilization method program is executed by the processor to implement the following steps: Obtain retired power battery pack information; Disassemble the retired power battery pack to obtain multiple battery cells; Based on the preset discharge detection device, obtain the detection data information of the battery cell; Extracting the actual capacity of the battery cell and the characteristic detection data that affect the safety of the battery cell from the detection data information; According to the characteristic detection data that affects the safety of the battery cell, the safety factor value of the corresponding battery cell is obtained; The secondary utilization position of the corresponding battery cell is determined according to the actual capacity of the battery cell and the preset interval range of the safety factor value of the corresponding battery cell.

8. A retired power battery gradient utilization system according to claim 7, characterized in that: After extracting the actual capacity of the battery cell in the detection data information, the method further includes: Obtain the displayed capacity of the battery cell; Subtract the actual capacity from the displayed capacity of the battery cell to obtain the capacity difference of the corresponding battery cell; Determine whether the capacity difference of the battery cells is greater than or equal to a preset capacity difference threshold, if so, remove the corresponding battery cells; if not, retain the corresponding battery cells; The discarded battery cells are recycled as waste batteries.

9. A retired power battery gradient utilization system according to claim 7, characterized in that: The step of obtaining the safety factor value of the corresponding battery cell according to the characteristic detection data affecting the safety of the battery cell specifically includes: Based on battery cells in the same actual capacity range, characteristic detection data that affect the safety of the battery cells are plotted in a curve chart according to the discharge process; Extracting the limit value in the curve, and normalizing the limit value and the maximum and minimum values ​​in the preset safety interval of the corresponding feature to obtain a normalized value of the corresponding feature; Multiply the normalized value of the feature by the preset safety weight coefficient of the corresponding feature to obtain the safety factor ratio of the corresponding feature; The safety factor ratios of all characteristics that affect the safety of the battery cells are accumulated to obtain the safety factor value of the corresponding battery cell.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a retired power battery gradient utilization method program, and when the retired power battery gradient utilization method program is executed by the processor, the steps of the retired power battery gradient utilization method as described in any one of claims 1 to 6 are implemented.

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