Battery power control system and method for mining locomotive

Abstract

The invention discloses a battery power control system and method for a mining locomotive, relates to the technical field of battery power control, and solves the technical problems that an existing battery equalization method adopts static battery electric quantity equalization, and the efficiency is low when the existing battery equalization method is suitable for using batteries with large electric quantity and large power. The method includes: acquiring usage data of each battery pack, and analyzing the battery packs based on the usage data to obtain aging scores for evaluating aging conditions of the battery packs; adjusting a charge-discharge interval of the battery pack based on the aging score to obtain a current charge-discharge interval; when the running state is static, generating an equalization control scheme for performing equalization adjustment on the electric quantity among the battery packs based on the residual electric quantity and the charging and discharging interval; when the running state is running, acquiring the required voltage required by the motor, and generating an output control scheme for controlling the output of each battery pack based on the required voltage and the residual electric quantity; the service life of the whole power supply part is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of battery power control, and specifically relates to a battery power control system and method for mining locomotives. Background Art

[0002] The existing (patent No. CN 110654268 B) discloses a super-large power battery equalization charging circuit and control management method for locomotives. The charging circuit forms a battery pack by connecting single cells in parallel first and then in series. Multiple battery packs are connected in series to form a power supply branch. Each branch is connected in parallel to the intermediate DC circuit through the anti-parallel diode of the IGBT to supply power to the load. Multiple branches share a pre-charge resistor to charge the capacitor of the intermediate DC circuit. The charging control management method is as follows: during charging, each branch is controlled by an independent IGBT to separately control the charging current of each branch, so that the state of charge (SOC) of the batteries in each branch is consistent and the voltage is balanced.

[0003] The above battery voltage equalization control method judges whether the voltage difference between each battery group is greater than the set voltage threshold, and then judges whether it is necessary to equalize the power of each battery group, so as to reduce the voltage difference between each battery group; the main reason for the large voltage difference between each battery group during vehicle operation is the selection of the battery power supply scheme. It is difficult to achieve equalization adjustment of the power between battery groups during vehicle operation, which reduces the efficiency of the battery group voltage equalization method; especially in the case of mining locomotives that use batteries with large power and large capacity, the efficiency is low; therefore, a battery power control system and method for mining locomotives are needed. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art; for this purpose, this application proposes a battery power control system and method for mining locomotives to solve the technical problem that the existing battery equalization method uses static battery power equalization and has low efficiency in the case of using batteries with large power and large capacity.

[0005] To achieve the above object, the first aspect of this application provides a battery power control method for mining locomotives, including the following steps: Obtain the usage data of each battery group, Analyze the battery group based on the usage data to obtain an aging score for evaluating the aging condition of the battery group; Adjust the charge and discharge interval of the battery group based on the aging score to obtain the current charge and discharge interval; Obtain the operating state of the mining locomotive and the remaining power of each battery group; When the operating state is stationary, an equalization control scheme for equalizing the power among the battery packs is generated based on the remaining power and the charge-discharge interval; When the operating state is running, the required demand voltage of the motor is obtained, and an output control scheme for controlling the output of each battery pack is generated based on the demand voltage and the remaining power.

[0006] In this application, by obtaining the usage data of each battery pack, analyzing the battery pack according to the usage data to obtain an aging score for evaluating the aging condition of the battery pack; adjusting the charge-discharge interval of the battery pack according to the aging score to obtain the current charge-discharge interval; obtaining the operating state of the mining locomotive and the remaining power of each battery pack; when the operating state is stationary, an equalization control scheme for equalizing the power among the battery packs is generated based on the remaining power and the charge-discharge interval; when the operating state is running, the required demand voltage of the motor is obtained, and an output control scheme for controlling the output of each battery pack is generated according to the demand voltage and the remaining power; the equalization adjustment of the battery pack voltage is realized in the running and stationary states of the locomotive, and the states of each battery pack are ensured to be as consistent as possible, so as to extend the service life of the entire power supply part.

[0007] Preferably, generating the aging score based on the usage data includes: Extracting several charging data, discharging data and remaining power data from the usage data; extracting several charging state parameters in the charging data, several discharging state parameters in the discharging data, and the remaining power in each period of the remaining power data; the charging data is the data recorded when the battery is charged, including several charging state parameters during charging, and the charging state parameters are related parameters such as voltage, current and battery temperature during charging; the discharging data is the data recorded when the battery is discharged, including several discharging state parameters during discharging, and the discharging state parameters are related parameters such as voltage, current and battery temperature during discharging; the remaining power is the power of the battery when it is not in use, Calculating an influence coefficient one for representing the influence of the usage condition of the battery pack on the aging of the battery pack based on several charging state parameters and several discharging state parameters; Calculating an influence coefficient two for representing the influence of the remaining power of the battery pack during storage on the aging of the battery pack based on the power in each period; Adding the influence coefficient one and the influence coefficient two to obtain an aging score for comprehensively representing the aging condition of the battery pack.

[0008] Preferably, calculating the influence coefficient one based on several charging state parameters and several discharging state parameters includes: Obtaining several charging state parameters, several discharging state parameters, the optimal numerical values of the charging state parameters corresponding to each charging state parameter, and the optimal numerical values of the discharging state parameters corresponding to each discharging state parameter; Input the difference between the charging state parameter and its corresponding optimal value of the charging state parameter into the set quantization influence function 1 to obtain the charging state parameter influence coefficient representing the influence of the charging state parameter on the battery; Input the difference between the discharging state parameter and its corresponding optimal value of the discharging state parameter into the set quantization influence function 2 to obtain the discharging state parameter influence coefficient representing the influence of the discharging state parameter on the battery; Successively obtain the charging state parameter influence coefficients in several charging data and the discharging state parameter influence coefficients in several discharging data, and perform weighted summation on each charging state parameter influence coefficient and discharging state parameter influence coefficient to obtain influence coefficient 1 representing the influence of the usage of the battery pack on the aging of the battery pack.

[0009] Preferably, calculating the influence coefficient 2 based on the power in each period includes: Obtain the remaining power and the period duration in each period; query the corresponding storage influence coefficient in the storage power influence lookup table according to the remaining power, and the storage influence coefficient is the influence of the remaining power on the battery aging per unit time of storage; the storage power influence lookup table includes several battery powers and their corresponding storage influence coefficients, and the battery power is presented in percentage form; Sum the products of the period durations in each period and their corresponding storage influence coefficients to obtain influence coefficient 2 representing the influence of the storage situation on the aging of the battery pack.

[0010] Preferably, adjusting the charge and discharge interval of the battery pack based on the aging score to obtain the current charge and discharge interval includes: Extract the upper power limit and the lower power limit in the charge and discharge interval; obtain the set adjustment step, and the adjustment step is the reduction amount of the charge and discharge interval of the battery pack per unit aging score; record the product of the aging score and the adjustment step as the reduction amount; record the difference between the upper power limit and the reduction amount as the current upper power limit; record the sum of the lower power limit and the reduction amount as the current lower power limit; re-integrate the current upper power limit and the lower power limit into the charge and discharge interval.

[0011] Preferably, generating the equalization control scheme based on the remaining power and the charge and discharge interval includes: S1: Obtain the remaining power of each battery pack; determine whether each remaining power is within the charge and discharge interval; if yes, enter S4; if no, enter S2; S2: Determine whether each remaining power exceeds the upper power limit in the charge and discharge interval; if yes, generate a power saturation alarm signal; if no, enter S3; S3: Determine whether each remaining power is lower than the lower limit of the charge-discharge range; if so, generate a low-power alarm signal; if not, generate several balanced battery pairs based on the remaining power of the battery pack and enter S7; S4: Obtain the remaining power in the battery pack; arrange them in descending order of the remaining power to obtain a power ranking table; S5: Determine whether the voltage difference between the battery pack ranked first and the battery pack ranked last in the power ranking table is greater than the set voltage difference threshold; if so, enter S6; if not, enter S7; S6: Integrate the battery pack ranked first and the battery pack ranked last into a balanced battery pair; and delete the battery packs belonging to the balanced battery pair in the power ranking table to generate a new power ranking table, and jump to S5; S7: Obtain each balanced battery pair, use the battery pack with the larger remaining power in the balanced battery pair as the discharging battery pack, and use the battery pack with the smaller remaining power as the charging battery pack; thereby generating a charging scheme for the balanced battery pair, and the charging scheme is a control scheme for controlling the discharging battery pack to charge the charging battery pack; including the charged power; enter S8; S8: Integrate the charging schemes of each balanced battery pair into a balanced control scheme.

[0012] Preferably, generating several of the balanced battery pairs based on the remaining power of the battery pack and the charge-discharge range includes: S31: Arrange each battery pack in descending order of the remaining power to obtain a power ranking table; S32: Determine whether the remaining power of the battery pack ranked first exceeds the upper limit of the charge-discharge range, or whether the remaining power of the battery pack ranked last is lower than the lower limit of the charge-discharge range; if so, enter S33; if not, enter S34; S33: Integrate the battery pack ranked first and the battery pack ranked last into a balanced battery pair, and delete the battery packs belonging to the balanced battery pair in the power ranking table to generate a new power ranking table; jump to S32; S34: Determine whether the voltage difference between the battery pack ranked first and the battery pack ranked last in the power ranking table is greater than the set voltage difference threshold; if so, enter S35; if not, output each balanced battery pair; S35: Integrate the battery pack ranked first and the battery pack ranked last into a balanced battery pair; and delete the battery packs belonging to the balanced battery pair in the power ranking table to generate a new power ranking table, and jump to S34.

[0013] Preferably, generating the output control scheme based on the required voltage and the remaining power includes: Obtain the remaining power of each battery pack, and mark the battery packs whose remaining power exceeds the upper limit of the charge-discharge interval as priority battery packs; number the priority battery packs in descending order according to the difference between the remaining power and the upper limit of the charge-discharge interval; Number the remaining battery packs in descending order according to the difference between the remaining power and the lower limit of the charge-discharge interval; Obtain the required voltage, and preferentially select the priority battery packs in the order of the numbers according to the required voltage, then select the remaining battery packs in the order of the numbers for power supply, and integrate the selected priority battery packs and / or the remaining battery packs into an output control scheme. It should be noted that it is sufficient to supply power to the power with a difference less than the voltage difference threshold between the lowest remaining power of the battery packs exceeding the lower limit value of the charge-discharge interval.

[0014] Another aspect of the present application provides a battery power control system for a mine locomotive, including: a data acquisition module, a battery pack evaluation module, a power control module, an alarm module, and a database; Battery pack evaluation module: Obtain the usage data of each battery pack through the database, analyze the battery packs based on the usage data to obtain an aging score for evaluating the aging condition of the battery packs; adjust the charge-discharge interval of the battery packs based on the aging score to obtain the current charge-discharge interval; the battery pack is composed of multiple battery packs; a battery pack combination that can meet the minimum power supply, such as the battery packs on a series line in a series-first and then-parallel power supply method form a battery pack; in a parallel-first and then-series power supply method, a set number of parallel battery packs is a battery pack, and the set number in this embodiment is one; Data acquisition module: Obtain the remaining power of the battery pack and the operating status of the mine locomotive; The power control module includes a balance control unit and an output control unit; The balance control unit: When the operating status is stationary; generate a balance control scheme for balancing the power between each battery pack based on the remaining power and the charge-discharge interval; The output control unit: When the operating status is running; obtain the required voltage of the motor, and generate an output control scheme for controlling the output of each battery pack based on the required voltage and the remaining power.

[0015] Compared with the prior art, the beneficial effects of the present application are: 1. This application obtains the usage data of each battery pack, analyzes the battery pack based on the usage data to obtain an aging score for evaluating the aging condition of the battery pack; adjusts the charge and discharge range of the battery pack according to the aging score to obtain the current charge and discharge range; obtains the operating state of the mining locomotive and the remaining power of each battery pack; when the operating state is stationary, generates an equalization control scheme for equalizing the power between each battery pack based on the remaining power and the charge and discharge range; when the operating state is running, obtains the required demand voltage of the motor, and generates an output control scheme for controlling the output of each battery pack according to the demand voltage and the remaining power; realizes the equalization adjustment of the battery pack voltage in the locomotive running and stationary states, ensures that the states of each battery pack are as consistent as possible, and extends the life of the entire power supply part.

[0016] 2. This application further improves the accuracy of subsequent battery power adjustment through the aging analysis of the battery pack.

[0017] 3. This application preferentially selects the battery packs with the power upper limit exceeded in the charge and discharge range for power supply, so that these battery packs can return to normal power; after the battery packs with the power upper limit exceeded in the charge and discharge range are used up, selects the battery pack with the largest remaining power for power supply, which can reduce the remaining power of the corresponding battery pack, realizes the dynamic equalization of battery power, and then realizes the dynamic equalization of battery voltage, ensures that the states of each battery pack are as consistent as possible, and extends the life of the entire power supply part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the steps of the battery power control method in the present application; Figure 2 It is a schematic diagram of the module connection of the battery power control system in the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions of the present application in conjunction with the embodiments. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0021] Please refer to Figure 1, a first aspect of the present application provides a battery power control method for a mining locomotive, including the following steps: Obtain the usage data of each battery pack. The usage data is the relevant data collected when the battery pack is in the charging, discharging, and unused states, including the current, voltage, and battery temperature during charging or discharging, and the remaining power in the unused state, etc.; Analyze the battery pack based on the usage data to obtain an aging score for evaluating the aging condition of the battery pack; the aging score represents the aging condition of the current battery pack, that is, the performance condition; the larger the aging score, the more serious the performance degradation of the battery pack; Adjust the charge and discharge range of the battery pack based on the aging score to obtain the current charge and discharge range; the original charge and discharge range is the charge and discharge range of the battery pack, including the upper limit and lower limit of the remaining battery power. For example, if the charge and discharge range is 10%-90%, the corresponding power upper limit is 90% and the power lower limit is 10%; the adjusted charge and discharge range is the charge and discharge range suitable for the current battery pack; Obtain the operating state of the mining locomotive and the remaining power of each battery pack; the operating state indicates whether the mining locomotive is started. When the mining locomotive is started, the operating state is running; when the mining locomotive is not started, the operating state is stationary; When the operating state is stationary, generate an equalization control scheme for equalizing the power between each battery pack based on the remaining power and the charge and discharge range; When the operating state is running, obtain the required demand voltage of the motor. The demand voltage is the voltage corresponding to the output speed required by the motor; generate an output control scheme for controlling the output of each battery pack based on the demand voltage and the remaining power.

[0022] In this embodiment, by obtaining the usage data of each battery pack, analyzing the battery pack according to the usage data to obtain an aging score for evaluating the aging condition of the battery pack; adjusting the charge and discharge range of the battery pack according to the aging score to obtain the current charge and discharge range; obtaining the operating state of the mining locomotive and the remaining power of each battery pack; when the operating state is stationary, generating an equalization control scheme for equalizing the power between each battery pack based on the remaining power and the charge and discharge range; when the operating state is running, obtaining the required demand voltage of the motor, and generating an output control scheme for controlling the output of each battery pack according to the demand voltage and the remaining power; the equalization adjustment of the battery pack voltage is realized in the running and stationary states of the locomotive, ensuring that the states of each battery pack are as consistent as possible and extending the life of the entire power supply part.

[0023] Generating an aging score based on usage data, including: extracting several charging data, discharging data, and remaining power data from the usage data; extracting several charging state parameters from the charging data, several discharging state parameters from the discharging data, and the remaining power at each time period in the remaining power data; the charging data is the data recorded during battery charging, including several charging state parameters during charging, and the charging state parameters are related parameters such as voltage, current, and battery temperature during charging; the discharging data is the data recorded during battery discharging, including several discharging state parameters during discharging, and the discharging state parameters are related parameters such as voltage, current, and battery temperature during discharging; the remaining power is the power of the battery when not in use, and the time period is a set time length; Calculating an influence coefficient one for representing the influence of the usage condition of the battery pack on the aging of the battery pack based on several charging state parameters and several discharging state parameters; Calculating an influence coefficient two for representing the influence of the remaining power of the battery pack during storage on the aging of the battery pack based on the power at each time period; Summing the influence coefficient one and the influence coefficient two to obtain an aging score for comprehensively representing the aging condition of the battery pack.

[0024] In this embodiment, by evaluating the state during battery charging, discharging, and non - use states, a comprehensive and thorough analysis of the battery is carried out, making the finally obtained current state of the corresponding battery more accurate; thereby improving the accuracy of subsequent other operations based on this.

[0025] Calculating the influence coefficient one based on several charging state parameters and several discharging state parameters, including: Obtaining several charging state parameters, several discharging state parameters, the set optimal values of the charging state parameters corresponding to each charging state parameter, and the set optimal values of the discharging state parameters corresponding to each discharging state parameter; the optimal value of the charging state parameter or the discharging state parameter is the theoretical value of the corresponding parameter during the charging process or discharging process set at the time of factory shipment of the corresponding battery pack, and the optimal value in this embodiment is the rated value of the corresponding parameter.

[0026] Inputting the difference between the charging state parameter and its corresponding optimal value of the charging state parameter into a set quantization influence function one to obtain a charging state parameter influence coefficient for representing the influence of the charging state parameter on the battery; the quantization influence function one is used to quantize the aging influence of each charging state parameter on the battery; Inputting the difference between the discharging state parameter and its corresponding optimal value of the discharging state parameter into a set quantization influence function two to obtain a discharging state parameter influence coefficient for representing the influence of the discharging state parameter on the battery; the quantization influence function two is used to quantize the aging influence of each discharging state parameter on the battery; Successively obtain the influence coefficients of each charging state parameter in a number of charging data and the influence coefficients of the discharge state parameters in a number of discharge data, and perform weighted summation on the influence coefficients of each charging state parameter and the influence coefficients of the discharge state parameters to obtain an influence coefficient one for representing the influence of the usage of the battery pack on the aging of the battery pack.

[0027] Specifically, in this embodiment, the influence coefficient one is obtained in the following manner, including: obtaining a number of charging state parameters CDij and a number of discharge state parameters FDmn; and the optimal values ZCDj corresponding to each charging state parameter and the optimal values ZFDn corresponding to each discharge state parameter; where i is the number of the charging data corresponding to the charging state parameter, j is the number of the charging state parameter; m is the number of the discharge data corresponding to the discharge state parameter, and n is the number of the discharge state parameter; Through the formula Calculate the difference CCij between the charging state parameter and its corresponding optimal value; through the formula Calculate the difference FCmn between the discharge state parameter and its corresponding optimal value; Through the formula: , where YX1 is the influence coefficient one; α1 and α2 are proportionality coefficients used to adjust the influence of the charging and discharging processes on battery aging, and the specific values are set according to experience. Since this embodiment is for a mine locomotive and the load during vehicle operation is large, the influence on battery aging is also large, so α1 < α2 in this embodiment; in this embodiment, α1 = 0.42 and α2 = 0.58; εj is the adjustment factor of the charging state parameter numbered j, 0 < εj < 1; the specific value is set by an expert according to the degree of influence of the corresponding charging state parameter on battery aging; for the same degree of deviation of the corresponding charging state parameter, the greater the influence on battery aging, the greater the value of the corresponding adjustment factor; δn is the adjustment factor of the discharge state parameter numbered n; 0 < δn < 1; the specific value is set by an expert according to the degree of influence of the corresponding discharge state parameter on battery aging; for the same degree of deviation of the corresponding discharge state parameter, the greater the influence on battery aging, the greater the value of the corresponding adjustment factor; Pj() is the set quantization influence function one corresponding to the charging state parameter numbered j; Qn() is the set quantization influence function two corresponding to the charging state parameter numbered n; both the quantization influence function one and the quantization influence function two are set increasing functions; the quantization influence function one in this embodiment is: , The quantization influence function two is: , Among them, DCCj is the unit parameter corresponding to the charging state parameter with the set number j, which is used to remove and quantify the corresponding charging state parameter; DFCn is the unit parameter corresponding to the discharging state parameter with the set number n, which is used to remove and quantify the corresponding discharging state parameter; μj is the base parameter corresponding to the charging state parameter with the set number j, and γn is the base parameter corresponding to the discharging state parameter with the set number n; both μj and γn are constants greater than 1, which are used to control the size relationship between the charging state parameter and the discharging state parameter when they are converted into the influence array; cooperate with the unit parameter to realize the quantification of the influence of the charging state parameter or the discharging state parameter on battery aging; the specific values are set according to experience.

[0028] Specifically, in this embodiment, the charging state parameters include charging voltage, charging current, charging power, charging temperature, etc., and their corresponding unit parameters are DCC1 = 1V, DCC2 = 1A, DCC3 = 1W, DCC4 = 1°C, etc.; their corresponding base parameters are μ1 = 4, μ2 = 4, μ3 = 4, μ4 = 2, etc.; their corresponding adjustment factors are ε1 = 0.5, ε2 = 0.5, ε3 = 0.5, ε4 = 0.7, etc.; during the charging process, the charging temperature will directly affect the internal chemical balance of the battery, and thus has a greater impact on battery aging. Therefore, the corresponding adjustment factor is set larger; the discharging state parameters include discharging voltage, discharging current, discharging power, discharging temperature, etc., and their corresponding unit parameters are DCC1 = 1V, DCC2 = 1A, DCC3 = 1W, DCC4 = 1°C, etc.; their corresponding base parameters are γ1 = 4, γ2 = 4, γ3 = 4, γ4 = 2, etc.; their corresponding adjustment factors are δ1 = 0.6, δ2 = 0.5, δ3 = 0.6, δ4 = 0.7, etc.; during the discharging process, the discharging temperature will also directly affect the internal chemical balance of the battery, and thus has a greater impact on battery aging. Therefore, the corresponding adjustment factor is set larger.

[0029] It can be understood that evaluating the battery aging situation is a relatively existing technology, and other battery aging evaluations can be used to replace the aging evaluation scheme given in this embodiment; the remaining examples can still be implemented.

[0030] In this embodiment, the influence factor one is obtained through the above steps. The greater the gap between the charging state parameter or the discharging state parameter and its corresponding optimal value, the more serious the impact of the charging process or the discharging process on battery aging; the larger the corresponding influence factor one is set; since different charging state parameters or discharging state parameters have different impacts on battery aging, this embodiment adjusts their impacts by setting corresponding adjustment factors, so that the quantification result can more accurately represent the current state of the battery.

[0031] The influence coefficient two is calculated based on the electricity consumption in each time period, including: obtaining the remaining electricity and the time period duration in each time period; querying the corresponding storage influence coefficient in the stored electricity influence lookup table according to the remaining electricity, where the storage influence coefficient is the influence of the remaining electricity on the battery aging within a unit time of storage; the stored electricity influence lookup table includes several battery powers and their corresponding storage influence coefficients, and the battery power is presented in percentage form; if the remaining electricity is between 80% - 100%, the battery in this state may cause the internal pressure of the battery to increase, exacerbate side reactions, such as electrolyte decomposition, lithium dendrite growth, etc., which will lead to accelerated capacity attenuation, that is, accelerated aging, and the corresponding storage influence coefficient is set to be larger; if the remaining electricity is between 40% - 50%, the battery in this state balances the risk of self-discharge and side reactions, avoiding irreversible damage caused by over-discharge or full charge of the battery, and the battery aging situation is smaller, and the corresponding storage influence coefficient is set to be smaller; if the remaining electricity is between 0% - 20%, the battery in this state may trigger an over-discharge protection mechanism, resulting in the growth of copper dendrites, which may damage the battery structure in the long term, and the aging influence is larger, and the corresponding storage influence coefficient is set to be larger; the specific values of the storage influence coefficients are set by experts through experiments; specifically, prepare several batteries of the same model, charge each battery to the set power range, in this embodiment, 50 groups of batteries with powers of 10%, 30%, 50%, 70% and 90% are set respectively; statically place them in the same environment for the set duration, in this embodiment, the placement time is 1 year; after charging the battery to full charge, obtain the battery power in its full charge state, and calculate the ratio of the battery power at full charge when leaving the factory to the current battery power; obtain the average value of the ratio of the 10% battery group as the storage influence coefficient for the corresponding group; sequentially obtain the storage influence coefficients corresponding to each group; finally, obtain the stored electricity influence lookup table as follows: 。

[0032] Sum the products of the duration of each time period and its corresponding storage influence coefficient to obtain the influence coefficient two representing the aging influence on the battery pack in the storage situation; specifically, calculate the influence coefficient two through the formula YX2 = ∑(CFXt × Tt / DT), where CFXt is the storage influence coefficient corresponding to the time period numbered t, and Tt is the duration corresponding to the time period numbered t; t = 1, 2,..., G; G is the total number of time periods; DT is the set unit duration used to quantify the time period duration; DT = 600s in this embodiment.

[0033] Adjust the charge and discharge interval of the battery pack based on the aging score to obtain the current charge and discharge interval, including: Extract the upper and lower limits of the battery charge and discharge range; obtain the set adjustment step size, where the adjustment step size is the reduction amount of the battery pack charge and discharge range per unit aging score; the adjustment step size can be obtained through experimental verification or expert experience; record the product of the aging score and the adjustment step size as the reduction amount; record the difference between the upper limit of the battery charge and the reduction amount as the current upper limit of the battery charge; record the sum of the lower limit of the battery charge and the reduction amount as the current lower limit of the battery charge; re-integrate the current upper and lower limits of the battery charge into the charge and discharge range.

[0034] In this embodiment, the accuracy of subsequent battery charge adjustment is further improved through the aging analysis of the battery pack.

[0035] Generate the balancing control scheme based on the remaining battery charge and the charge and discharge range, including: S1: Obtain the remaining battery charge of each battery pack; determine whether each remaining battery charge is within the charge and discharge range; if yes, it means that the remaining battery charges are all within the safe range, and only balancing adjustment is performed; at this time, enter S4; if no, it means that the remaining battery charges need to be adjusted to the safe range first and then the balancing adjustment is performed, and at this time, enter S2; S2: Determine whether each remaining battery charge exceeds the upper limit of the battery charge in the charge and discharge range; if yes, generate a battery charge saturation alarm signal, and the battery charge saturation alarm signal indicates that the battery charge of each current battery pack exceeds the reasonable battery charge value. If this continues for a long time, it will cause the battery pack life to decline; if no, enter S3; S3: Determine whether each remaining battery charge is lower than the lower limit of the battery charge in the charge and discharge range; if yes, generate a battery charge too low alarm signal, and the battery charge too low alarm signal indicates that the battery charge of each current battery pack is lower than the reasonable battery charge value. If this continues for a long time, it will cause the battery pack life to decline; if no, generate several balanced battery pack pairs based on the remaining battery charge of the battery pack and the charge and discharge range, and the balanced battery pack pair is two battery packs for corresponding charging or discharging; enter S7; S4: Obtain the remaining battery charge in the battery pack; sort it in descending order of the remaining battery charge to obtain a battery charge sorting table; S5: Determine whether the voltage difference between the battery pack ranked first and the battery pack ranked last in the battery charge sorting table is greater than the set voltage difference threshold, and the voltage difference threshold is set according to experience; if yes, it means that the voltage between the two battery packs is unbalanced and needs to be adjusted; at this time, enter S6; if no, it means that the voltages of the remaining battery packs are balanced and no adjustment is required, and at this time, enter S7; S6: Integrate the battery pack ranked first and the battery pack ranked last into a balanced battery pack pair; and delete the battery packs belonging to the balanced battery pack pair in the battery charge sorting table to generate a new battery charge sorting table, and jump to S5; S7: Obtain each pair of balanced battery packs. Take the battery pack with a larger remaining power in the pair of balanced battery packs as the discharging battery pack, and take the battery pack with a smaller remaining power as the charging battery pack; thereby generate a charging scheme for the pair of balanced battery packs, where the charging scheme is a control scheme for controlling the discharging battery pack to charge the charging battery pack; the exchanged power in the balanced battery pack is half of the difference between the powers of the two battery packs; proceed to S8; S8: Integrate the charging schemes of each pair of balanced battery packs into a balanced control scheme.

[0036] Generate several pairs of balanced battery packs based on the remaining power of the battery packs and the charge-discharge interval, including: S31: Arrange each battery pack in descending order of the remaining power to obtain a power sorting table; S32: Determine whether the remaining power of the battery pack ranked first in the sorting exceeds the upper limit of the power in the charge-discharge interval, or whether the remaining power of the battery pack ranked last in the sorting is lower than the lower limit of the power in the charge-discharge interval; if yes, proceed to S33; if no, proceed to S34; S33: Integrate the battery pack ranked first in the sorting and the battery pack ranked last in the sorting into a pair of balanced battery packs, and delete the battery packs belonging to the pair of balanced battery packs in the power sorting table to generate a new power sorting table; jump to S32; S34: Determine whether the voltage difference between the battery pack ranked first in the power sorting table and the battery pack ranked last in the sorting is greater than the set voltage difference threshold; if yes, proceed to S35; if no, output each pair of balanced battery packs; S35: Integrate the battery pack ranked first in the sorting and the battery pack ranked last in the sorting into a pair of balanced battery packs; and delete the battery packs belonging to the pair of balanced battery packs in the power sorting table to generate a new power sorting table, and jump to S34.

[0037] In this embodiment, by adjusting the power of the battery packs that exceed the upper limit of the power in the charge-discharge interval and the battery packs that are lower than the lower limit of the power in the charge-discharge interval into the charging interval, and then narrowing the difference in power between each battery pack, dynamic equalization of the battery power is achieved, and then dynamic equalization of the battery voltage is achieved, so as to ensure that the states of each battery pack are as consistent as possible and extend the service life of the entire power supply part.

[0038] Generate an output control scheme based on the required voltage and the remaining power, including: obtain the remaining power of each battery pack, and mark the battery packs whose remaining power exceeds the upper limit of the power in the charge-discharge interval as priority battery packs; number the priority battery packs in descending order of the difference between the remaining power and the upper limit of the power in the charge-discharge interval; Number the remaining battery packs in descending order of the difference between the remaining power and the lower limit of the power in the charge-discharge interval; Obtain the required voltage. First, select the priority battery pack according to the required voltage in the order of the numbers, and then select the remaining battery packs in the order of the numbers for power supply. Integrate the selected priority battery pack and / or the remaining battery packs into an output control scheme.

[0039] In this embodiment, by preferentially selecting the battery packs with the upper limit of the power in the charge-discharge interval for power supply, these battery packs can return to the normal power level. After the battery packs with the upper limit of the power in the charge-discharge interval are used up, select the battery pack with the largest remaining power for power supply, which can reduce the remaining power of the corresponding battery pack, realize the dynamic equalization of the battery power, and then realize the dynamic equalization of the battery voltage, ensure that the states of all battery packs are as consistent as possible, and extend the life of the entire power supply part.

[0040] Please refer to Figure 2 , another aspect of the present application provides a battery power control system for a mine locomotive, including: a data acquisition module, a battery pack evaluation module, a power control module, an alarm module, and a database; Battery pack evaluation module: Obtain the usage data of each battery pack through the database, analyze the battery pack based on the usage data to obtain an aging score for evaluating the aging condition of the battery pack; adjust the charge-discharge interval of the battery pack based on the aging score to obtain the current charge-discharge interval; the battery pack is composed of multiple battery packs; a combination of battery packs that can meet the minimum power supply, such as the battery packs on a series line in a series-first and then-parallel power supply method form a battery pack; in a parallel-first and then-series power supply method, a set number of parallel battery packs is a battery pack, and the set number in this embodiment is one; Data acquisition module: Obtain the remaining power of the battery pack and the operating state of the mine locomotive; The power control module includes an equalization control unit and an output control unit; The equalization control unit: When the operating state is stationary; generate an equalization control scheme for equalizing the power between each battery pack based on the remaining power and the charge-discharge interval; The output control unit: When the operating state is running; obtain the required voltage of the motor, and generate an output control scheme for controlling the output of each battery pack based on the required voltage and the remaining power; The alarm module is used to give early warnings for the power saturation alarm signal and the low power alarm signal; The database is used to store all the data of this system.

[0041] Some of the data in the above formula is calculated by removing the dimension and taking its numerical value. The formula is obtained by software simulation of a large amount of collected data to get a formula closest to the actual situation; the preset parameters and preset thresholds in the formula are set by those skilled in the art according to the actual situation or obtained by simulation of a large amount of data.

[0042] Working principle of this application: This application obtains the usage data of each battery pack, analyzes the battery pack based on the usage data to obtain an aging score for evaluating the aging condition of the battery pack; adjusts the charge and discharge interval of the battery pack according to the aging score to obtain the current charge and discharge interval; obtains the operating state of the mining locomotive and the remaining power of each battery pack; when the operating state is stationary, generates an equalization control scheme for equalizing the power between each battery pack based on the remaining power and the charge and discharge interval; when the operating state is running, obtains the required demand voltage of the motor, and generates an output control scheme for controlling the output of each battery pack according to the demand voltage and the remaining power; realizes the equalization adjustment of the battery pack voltage in both the running and stationary states of the locomotive, ensures that the states of each battery pack are as consistent as possible, and extends the service life of the entire power supply part.

[0043] The above embodiments are only used to illustrate the technical method of this application and not to limit it. Although this application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of this application can be modified or equivalently replaced without departing from the spirit and scope of the technical method of this application.

Claims

1. A battery power control method for a mine locomotive, characterized in that, Including: Obtaining usage data of the battery pack of a mine locomotive; Analyzing the battery pack based on the usage data to obtain an aging score for evaluating the aging condition of the battery pack; Adjusting the charge and discharge range of the battery pack based on the aging score to obtain the current charge and discharge range; Obtaining the operating state of the mine locomotive and the remaining power of each battery pack; When the operating state is running, obtaining the required demand voltage of the motor, and generating an output control scheme for controlling the output of each battery pack based on the demand voltage and the remaining power.

2. The battery power control method for a mine locomotive according to claim 1, characterized in that, Generating the aging score based on the usage data, including: Extracting several charging data, discharging data, and remaining power data from the usage data; Extracting several charging state parameters from the charging data, several discharging state parameters from the discharging data, and the remaining power at each time period in the remaining power data; Calculating an influence coefficient one for representing the influence of the usage condition of the battery pack on the aging of the battery pack based on several charging state parameters and several discharging state parameters; Calculating an influence coefficient two for representing the influence of the remaining power of the battery pack during storage on the aging of the battery pack based on the power at each time period; Summing the influence coefficient one and the influence coefficient two to obtain an aging score for comprehensively representing the aging condition of the battery pack.

3. The battery power control method for a mine locomotive according to claim 2, characterized in that, Calculating the influence coefficient one based on several charging state parameters and several discharging state parameters, including: Obtaining several charging state parameters, several discharging state parameters, the optimal value of the charging state parameter corresponding to each charging state parameter, and the optimal value of the discharging state parameter corresponding to each discharging state parameter; Inputting the difference between the charging state parameter and its corresponding optimal value of the charging state parameter into a set quantization influence function one to obtain a charging state parameter influence coefficient for representing the influence of the charging state parameter on the battery; Inputting the difference between the discharging state parameter and its corresponding optimal value of the discharging state parameter into a set quantization influence function two to obtain a discharging state parameter influence coefficient for representing the influence of the discharging state parameter on the battery; Successively obtaining the charging state parameter influence coefficients in several charging data and the discharging state parameter influence coefficients in several discharging data, and performing weighted summation on each charging state parameter influence coefficient and discharging state parameter influence coefficient to obtain an influence coefficient one for representing the influence of the usage condition of the battery pack on the aging of the battery pack.

4. The battery power control method for a mine locomotive according to claim 2, characterized in that, Calculating the influence coefficient two based on the power at each time period, including: Obtaining the remaining power and time period duration at each time period; querying the corresponding storage influence coefficient in the storage power influence lookup table according to the remaining power, and the storage influence coefficient is the influence of the remaining power per unit time of storage on battery aging; Summing the product of each time period duration and its corresponding storage influence coefficient to obtain an influence coefficient two for representing the influence of the storage condition on the aging of the battery pack.

5. The battery power control method for a mine locomotive according to claim 2, characterized in that, Adjusting the charge and discharge range of the battery pack based on the aging score to obtain the current charge and discharge range, including: Extract the upper and lower limits of the battery charge and discharge range; obtain the set adjustment step, where the adjustment step is the reduction amount of the battery pack charge and discharge range per unit aging score; record the product of the aging score and the adjustment step as the reduction amount; record the difference between the upper limit of the charge and the reduction amount as the current upper limit of the charge; record the sum of the lower limit of the charge and the reduction amount as the current lower limit of the charge; re-integrate the current upper and lower limits of the charge into the charge and discharge range.

6. The battery power control method for a mine locomotive according to claim 1, characterized in that, Generate the output control scheme based on the required voltage and the remaining battery power, including: Obtain the remaining battery power of each battery pack, and mark the battery packs with the remaining battery power exceeding the upper limit of the charge and discharge range as priority battery packs; number the priority battery packs in descending order according to the difference between the remaining battery power and the upper limit of the charge and discharge range; Number the remaining battery packs in descending order according to the difference between the remaining battery power and the lower limit of the charge and discharge range; Obtain the required voltage, preferentially select the priority battery packs in the order of the numbers according to the required voltage, then select the remaining battery packs in the order of the numbers for power supply, and integrate the selected priority battery packs and / or the remaining battery packs into the output control scheme.

7. The battery power control method for a mine locomotive according to claim 1, characterized in that, When the operating state is stationary, generate an equalization control scheme for equalizing the battery power between each battery pack based on the remaining battery power and the charge and discharge range.

8. The battery power control method for a mine locomotive according to claim 7, characterized in that, Generate the equalization control scheme based on the remaining battery power and the charge and discharge range, including: S1: Obtain the remaining battery power of each battery pack; determine whether each remaining battery power is within the charge and discharge range; if yes, go to S4; if no, go to S2; S2: Determine whether each remaining battery power exceeds the upper limit of the charge and discharge range; if yes, generate a battery power saturation alarm signal; if no, go to S3; S3: Determine whether each remaining battery power is lower than the lower limit of the charge and discharge range; if yes, generate a battery power too low alarm signal; if no, generate a number of equalization battery pack pairs based on the remaining battery power of the battery pack and the charge and discharge range, and go to S7; S4: Obtain the remaining battery power in the battery pack; arrange them in descending order of the remaining battery power to obtain a battery power ranking table; S5: Determine whether the voltage difference between the battery pack ranked first and the battery pack ranked last in the battery power ranking table is greater than the set voltage difference threshold; if yes, go to S6; if no, go to S7; S6: Integrate the battery pack ranked first and the battery pack ranked last into an equalization battery pack pair; and delete the battery packs belonging to the equalization battery pack pair in the battery power ranking table to generate a new battery power ranking table, and jump to S5; S7: Obtain each equalization battery pack pair, use the battery pack with the larger remaining battery power in the equalization battery pack pair as the discharging battery pack, and use the battery pack with the smaller remaining battery power as the charging battery pack; thus generate the charging scheme for the equalization battery pack pair, and go to S8; S8: Integrate the charging schemes of each equalization battery pack pair into an equalization control scheme; the charging scheme is a control scheme for controlling the discharging battery pack to charge the charging battery pack.

9. A battery power control method for a mine locomotive, characterized in that, Generate a number of the equalization battery pack pairs based on the remaining battery power of the battery pack and the charge and discharge range, including: S31: Arrange each battery pack in descending order of remaining power to obtain a power sorting table; S32: Determine whether the remaining power of the battery pack ranked first exceeds the upper limit of the power in the charge-discharge interval, or whether the remaining power of the battery pack ranked last is lower than the lower limit of the power in the charge-discharge interval; if yes, go to S33; if no, go to S34; S33: Integrate the battery pack ranked first and the battery pack ranked last into an equalized battery pack pair, and delete the battery packs belonging to the equalized battery pack pair in the power sorting table to generate a new power sorting table; jump to S32; S34: Determine whether the voltage difference between the battery pack ranked first and the battery pack ranked last in the power sorting table is greater than the set voltage difference threshold; if yes, go to S35; if no, output each equalized battery pack pair; S35: Integrate the battery pack ranked first and the battery pack ranked last into an equalized battery pack pair; and delete the battery packs belonging to the equalized battery pack pair in the power sorting table to generate a new power sorting table, and jump to S34.

10. A battery power control system for a mine locomotive, based on the application of the battery power control method for a mine locomotive according to any one of claims 1 to 9, characterized in that, Including: Battery pack evaluation module: Obtain the usage data of each battery pack through the database, and analyze the battery pack based on the usage data to obtain an aging score for evaluating the aging condition of the battery pack; Adjust the charge-discharge interval of the battery pack based on the aging score to obtain the current charge-discharge interval; Data acquisition module: Obtain the remaining power of the battery pack and the operating status of the mining locomotive; The power control module includes an equalization control unit and an output control unit; The equalization control unit: When the operating status is stationary; generate an equalization control scheme for equalizing the power between each battery pack based on the remaining power and the charge-discharge interval; The output control unit: When the operating status is running; obtain the required demand voltage of the motor, and generate an output control scheme for controlling the output of each battery pack based on the demand voltage and the remaining power.

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