A battery system control method and system based on SOX algorithm

Abstract

The present application provides a battery system control method and system based on the SOX algorithm. The method includes: obtaining the SOC value and SOH value of each battery cell, and determining whether to perform balanced adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack, performing performance testing on the battery pack after balanced adjustment, obtaining performance test data, including balanced performance test data and thermal balance performance test data, and processing to obtain the battery pack balanced evaluation index and thermal balance state evaluation index, testing the battery pack under different loads, obtaining response stability test data and processing to obtain the response stability evaluation index, processing to obtain the battery system comprehensive evaluation index according to the battery pack balanced evaluation index, thermal balance state evaluation index and response stability evaluation index, and obtaining the corresponding battery system control strategy data. Thereby realizing the technology of precise control of the battery system.

Description

Technical Field

[0001] The present application relates to the technical field of big data and battery system control, and specifically, to a battery system control method and system based on a SOX algorithm. Background Art

[0002] As an important power supply equipment, UPS (uninterruptible power supply) is widely used in data centers, communication base stations, medical equipment and other places with extremely high requirements for power supply stability. Its battery system regulation is the key to maintaining power output when the city power is interrupted. Battery pack balancing management and thermal balance management are key links in battery system regulation. They are of great significance in extending the service life of the battery pack, improving the performance of the battery pack and ensuring the safety of the battery pack. However, the existing technology for evaluating the balancing state and thermal balance state of the battery pack is only through simple and isolated parameter monitoring, which is difficult to achieve accurate and comprehensive control and has many limitations. The SOX (SOC / SOH) data of the battery pack is an important basis for the operation and decision-making of the battery system. At present, there is still a lack of a technology that determines the balancing state of the battery pack based on the battery status SOX data, and comprehensively considers the balancing effect and thermal balance state of the battery pack after balancing adjustment, so as to achieve refined control and optimization of the battery system. Summary of the invention

[0003] The purpose of this application is to provide a battery system control method and system based on the SOX algorithm, to determine the battery pack balance state according to the SOX (SOC / SOH) data of the battery pack, and to comprehensively consider the balance effect and thermal balance state of the battery pack after the balance adjustment, so as to realize the technology of fine control of the battery system.

[0004] The present application also provides a battery system control method based on the SOX algorithm, comprising the following steps:

[0005] Obtain the SOC value and SOH value of each battery cell, and determine whether to perform balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack;

[0006] Performing performance tests on the battery pack after equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data;

[0007] Obtaining a battery pack equalization evaluation index according to the equalization performance test data processing;

[0008] Obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing;

[0009] Testing the battery pack under different loads to obtain response stability test data, and obtaining a response stability evaluation index based on the response stability test data;

[0010] The battery system comprehensive evaluation index is obtained according to the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index, and the corresponding battery system control strategy data is obtained.

[0011] Optionally, in the battery system control method based on the SOX algorithm described in the present application, obtaining the SOC value and SOH value of each battery cell, and determining whether to perform a balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack, includes:

[0012] Obtain the SOC value and SOH value of each battery cell and the SOC value and SOH value of the battery pack, and calculate the SOC deviation value and SOH deviation value of the battery pack;

[0013] Comparing the battery pack SOC deviation value with a preset battery pack SOC deviation threshold to obtain an SOC threshold comparison result;

[0014] Comparing the battery pack SOH deviation value with a preset battery pack SOH deviation threshold to obtain an SOH threshold comparison result;

[0015] If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, the battery system is subjected to battery pack balancing adjustment.

[0016] Optionally, in the battery system control method based on the SOX algorithm described in the present application, the performance test is performed on the battery pack after the equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data, including:

[0017] The equalization performance test data includes voltage standard deviation, discharge capacity standard deviation, residual capacity standard deviation and internal resistance standard deviation;

[0018] The thermal balance performance test data includes maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

[0019] Optionally, in the battery system control method based on the SOX algorithm described in the present application, the step of obtaining a battery pack equalization evaluation index according to the equalization performance test data processing includes:

[0020] The battery pack balance evaluation index is obtained according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation.

[0021] Optionally, in the battery system control method based on the SOX algorithm described in the present application, the step of obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing includes:

[0022] The thermal equilibrium state evaluation index is obtained based on the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

[0023] Optionally, in the battery system control method based on the SOX algorithm described in the present application, the battery pack is tested under different loads to obtain response stability test data, and the response stability evaluation index is obtained according to the response stability test data processing, including:

[0024] The response stability test data includes output voltage fluctuation rate, output frequency deviation rate and transient response time;

[0025] The response stability evaluation index is calculated based on the output voltage fluctuation rate, the output frequency deviation rate and the transient response time.

[0026] Optionally, in the battery system control method based on the SOX algorithm described in the present application, the battery system comprehensive evaluation index is obtained according to the battery pack balance evaluation index, the thermal balance state evaluation index and the response stability evaluation index, and the corresponding battery system control strategy data is obtained, including:

[0027] Comparing the battery system comprehensive evaluation index with a preset battery system comprehensive evaluation index threshold to obtain a threshold comparison result;

[0028] If the threshold comparison result does not meet the preset threshold comparison result requirement, the comprehensive evaluation level of the battery system is determined according to the range level to which the threshold comparison result belongs;

[0029] The comprehensive evaluation level of the battery system is input into the preset battery management system comprehensive control platform for matching and identification to obtain the battery system control strategy data.

[0030] In a second aspect, the present application provides a battery system control system based on the SOX algorithm, the system comprising: a memory and a processor, the memory storing a program of a battery system control method based on the SOX algorithm, and the program of the battery system control method based on the SOX algorithm is executed by the processor to implement the following steps:

[0031] Obtain the SOC value and SOH value of each battery cell, and determine whether to perform balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack;

[0032] Performing performance tests on the battery pack after equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data;

[0033] Obtaining a battery pack equalization evaluation index according to the equalization performance test data processing;

[0034] Obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing;

[0035] Testing the battery pack under different loads to obtain response stability test data, and obtaining a response stability evaluation index based on the response stability test data;

[0036] The battery system comprehensive evaluation index is obtained according to the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index, and the corresponding battery system control strategy data is obtained.

[0037] Optionally, in the battery system control system based on the SOX algorithm described in the present application, the obtaining of the SOC value and SOH value of each battery cell and determining whether to perform a balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack include:

[0038] Obtain the SOC value and SOH value of each battery cell and the SOC value and SOH value of the battery pack, and calculate the SOC deviation value and SOH deviation value of the battery pack;

[0039] Comparing the battery pack SOC deviation value with a preset battery pack SOC deviation threshold to obtain an SOC threshold comparison result;

[0040] Comparing the battery pack SOH deviation value with a preset battery pack SOH deviation threshold to obtain an SOH threshold comparison result;

[0041] If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, the battery system is subjected to battery pack balancing adjustment.

[0042] From the above, it can be seen that the present application provides a battery system control method and system based on the SOX algorithm, which determines the battery pack balance state according to the SOX (SOC / SOH) data of the battery pack, and comprehensively considers the balance effect and thermal balance state of the battery pack after the balance adjustment, so as to realize the technology of fine-grained control of the battery system.

[0043] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A flow chart of a battery system control method based on a SOX algorithm provided in an embodiment of the present application;

[0046] Figure 2 A flow chart of determining whether to perform equalization adjustment on a battery pack in a battery system control method based on a SOX algorithm provided in an embodiment of the present application;

[0047] Figure 3 A flow chart of obtaining a response stability evaluation index of a battery system control method based on a SOX algorithm provided in an embodiment of the present application;

[0048] Figure 4 A flow chart of obtaining corresponding battery system control strategy data for a battery system control method based on a SOX algorithm provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0050] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] Please refer to Figure 1 , Figure 1The flowchart of the battery system control method based on the SOX algorithm in some embodiments of the present application. The battery system control method based on the SOX algorithm is used in terminal equipment, such as computers, mobile phone terminals, etc. The battery system control method based on the SOX algorithm includes the following steps:

[0052] S11, obtaining the SOC value and SOH value of each battery cell, and determining whether to perform balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack;

[0053] S12, performing a performance test on the battery pack after the equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data;

[0054] S13, obtaining a battery pack equalization evaluation index according to the equalization performance test data;

[0055] S14, obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing;

[0056] S15, testing the battery pack under different loads to obtain response stability test data, and obtaining a response stability evaluation index according to the response stability test data;

[0057] S16, obtaining a comprehensive evaluation index of the battery system according to the battery pack balance evaluation index, the thermal balance state evaluation index and the response stability evaluation index, and obtaining corresponding battery system control strategy data.

[0058] It should be noted that in this embodiment, SOX includes SOC and SOH, where SOC (State of Charge) represents the percentage of remaining power in the battery, and SOH (State of Health) is an indicator used to comprehensively evaluate the overall health status of the battery. First, the balance of the battery pack is determined based on the SOC data and SOH data of each battery cell. If it is determined to be unbalanced, it is adjusted, and the balanced performance of the battery pack after the balance adjustment is tested again. Since the imbalance of the battery pack is prone to thermal runaway, it is necessary to evaluate the thermal balance state of the battery pack and obtain the thermal balance state evaluation index. Since the UPS (uninterruptible power supply) maintains power output when the mains is interrupted, it is necessary to evaluate the stability of the battery pack's response under different loads when the mains is interrupted, obtain the response stability evaluation index, and finally obtain the battery system comprehensive evaluation index, and obtain the corresponding battery system control strategy. To achieve the purpose of regulating the battery system.

[0059] Please refer to Figure 2 , Figure 2The present invention is a flowchart of a battery system control method based on the SOX algorithm in some embodiments of the present application for determining whether to perform balanced adjustment on the battery pack. According to an embodiment of the present invention, the SOC value and SOH value of each battery cell are obtained, and the SOC value and SOH value of the battery pack are combined to determine whether to perform balanced adjustment on the battery pack, including:

[0060] S21, obtaining the SOC value and SOH value of each battery cell and the SOC value and SOH value of the battery pack, and calculating the SOC deviation value and SOH deviation value of the battery pack;

[0061] S22, comparing the battery pack SOC deviation value with a preset battery pack SOC deviation threshold to obtain an SOC threshold comparison result;

[0062] S23, comparing the battery pack SOH deviation value with a preset battery pack SOH deviation threshold to obtain an SOH threshold comparison result;

[0063] S24: If the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, then perform battery pack balancing adjustment on the battery system.

[0064] It should be noted that the SOC value and SOH value of each battery cell are compared with the SOC value and SOH value of the battery pack respectively to obtain the SOC difference and SOH difference, and the SOC difference with the largest value is used as the SOC deviation value of the battery pack, and the SOH difference with the largest value is used as the SOH deviation value. If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, it means that the battery pack has an unbalanced remaining capacity and an unbalanced health status, and the battery system is adjusted to balance the battery pack according to the preset adjustment method.

[0065] According to an embodiment of the present invention, the performance test is performed on the battery pack after the equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data, including:

[0066] The equalization performance test data includes voltage standard deviation, discharge capacity standard deviation, residual capacity standard deviation and internal resistance standard deviation;

[0067] The thermal balance performance test data includes maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

[0068] It should be noted that the standard deviations of the voltage, discharge capacity, internal resistance and remaining capacity of each battery cell after equalization adjustment are calculated respectively to obtain the voltage standard deviation, discharge capacity standard deviation, internal resistance standard deviation and remaining capacity standard deviation. The smaller the voltage standard deviation, discharge capacity standard deviation, internal resistance standard deviation and remaining capacity standard deviation, the better the consistency of the battery cells and the better the equalization effect. Among them, the discharge capacity refers to the total amount of electricity that can be discharged from the battery pack under test conditions starting from a fully charged state.

[0069] Thermal balance of a battery pack refers to a state in which the heat generated by the battery pack is equal to the heat dissipated during the operation of the battery pack, and the temperature of the battery pack remains relatively stable. However, unbalanced battery packs can easily lead to problems such as overcharging, overdischarging, and increased internal resistance, which will cause the battery to generate more heat. If this heat cannot be dissipated in time, it may cause thermal runaway. Therefore, it is very important to evaluate the thermal balance state of the battery pack. The temperature range is the difference between the highest temperature and the lowest temperature in the battery pack, which reflects the uniformity of the battery pack temperature. The smaller the temperature range, the more uniform the temperature of each part of the battery pack, and the better the thermal balance state. When the thermal balance state is good, the charge and discharge efficiency and output power of the battery pack should be maintained at normal levels. Thermal imbalance will reduce the charge and discharge efficiency and output power of the battery pack, and the temperature rise rate of the battery pack will increase. Therefore, the balance performance of the battery pack can be evaluated based on the voltage standard deviation, discharge capacity standard deviation, remaining capacity standard deviation, and internal resistance standard deviation, and the thermal balance performance of the battery pack can be evaluated based on the maximum temperature, temperature rise rate, temperature range, output power, and charge and discharge efficiency.

[0070] According to an embodiment of the present invention, the step of obtaining a battery pack equalization evaluation index according to the equalization performance test data includes:

[0071] The battery pack balance evaluation index is obtained according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation.

[0072] It should be noted that the balancing performance of the battery pack can be evaluated according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation to obtain the battery pack balancing evaluation index;

[0073] The calculation formula of the battery pack balance evaluation index is:

[0074] ;

[0075] in, is the battery pack balance evaluation index, , , and They are voltage standard deviation, discharge capacity standard deviation, remaining capacity standard deviation and internal resistance standard deviation. , , and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0076] According to an embodiment of the present invention, the step of obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing includes:

[0077] The thermal equilibrium state evaluation index is obtained based on the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

[0078] It should be noted that the thermal balance performance of the battery pack can be evaluated based on the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency to obtain a thermal balance state evaluation index;

[0079] The calculation formula of the thermal equilibrium state evaluation index is:

[0080] ;

[0081] in, is the thermal equilibrium state evaluation index, , , , and They are the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency. , , and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0082] Please refer to Figure 3 , Figure 3 The present invention is a flowchart of obtaining a response stability evaluation index of a battery system control method based on a SOX algorithm in some embodiments of the present invention. According to an embodiment of the present invention, the battery pack is tested under different loads to obtain response stability test data, and the response stability evaluation index is obtained according to the response stability test data processing, including:

[0083] S31, the response stability test data includes output voltage fluctuation rate, output frequency deviation rate and transient response time;

[0084] S32. Calculate a response stability evaluation index according to the output voltage fluctuation rate, the output frequency deviation rate and the transient response time.

[0085] It should be noted that since the UPS (uninterruptible power supply) maintains power output when the mains is interrupted, it is necessary to evaluate the stability of the battery pack's response under different loads when the mains is interrupted to obtain a response stability evaluation index. Among them, the output voltage fluctuation rate can be obtained by calculating the ratio of the difference between the maximum voltage and the minimum voltage during the measurement period to the rated voltage, the output frequency deviation rate can be obtained by calculating the ratio of the difference between the measured frequency and the rated frequency to the rated frequency, and the transient response time can be expressed by the maximum value of the time required for the output voltage and frequency to return to the stable value under different loads.

[0086] The calculation formula of the response stability evaluation index is:

[0087] ;

[0088] in, is the response stability assessment index, , and They are output voltage fluctuation rate, output frequency deviation rate and transient response time respectively. , and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0089] Please refer to Figure 4 , Figure 4 The present invention is a flowchart of obtaining corresponding battery system control strategy data of a battery system control method based on a SOX algorithm in some embodiments of the present application. According to an embodiment of the present invention, the battery system comprehensive evaluation index is obtained according to the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index, and the corresponding battery system control strategy data is obtained, including:

[0090] S41, comparing the battery system comprehensive evaluation index with a preset battery system comprehensive evaluation index threshold to obtain a threshold comparison result;

[0091] S42, if the threshold comparison result does not meet the preset threshold comparison result requirement, determining the comprehensive evaluation level of the battery system according to the range level to which the threshold comparison result belongs;

[0092] S43, inputting the comprehensive evaluation level of the battery system into a preset battery management system comprehensive control platform for matching and identification, and obtaining battery system control strategy data.

[0093] It should be noted that the battery system comprehensive evaluation index is obtained by processing the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index;

[0094] The calculation formula of the battery system comprehensive evaluation index is:

[0095] ;

[0096] in, is the comprehensive evaluation index of the battery system, is the response stability assessment index, is the thermal equilibrium state evaluation index, is the battery pack balance evaluation index, , and is a preset weight coefficient (which can be obtained by querying the preset battery management system database).

[0097] It is worth mentioning that according to an embodiment of the present invention, it also includes:

[0098] Calculate based on the SOC data and SOH data of the battery pack to obtain a discharge evaluation index;

[0099] Comparing the discharge evaluation index with a preset discharge evaluation index threshold, and comparing the thermal equilibrium state evaluation index with a preset thermal equilibrium state evaluation index threshold;

[0100] If the discharge evaluation index is greater than or equal to the preset discharge evaluation index threshold and the thermal balance state evaluation index is greater than or equal to the preset thermal balance state evaluation index threshold, normal discharge is performed, otherwise discharge adjustment is performed.

[0101] It should be noted that in order to effectively protect the battery pack, the remaining power, battery pack health status and battery pack thermal balance status need to be considered simultaneously when discharging the battery pack. If the remaining power of the battery pack is low and the battery pack health status is poor, or the thermal balance problem is more serious, the discharge mode needs to be adjusted.

[0102] The calculation formula of the discharge evaluation index is:

[0103] ;

[0104] in, is the discharge assessment index, and They are SOC data and SOH data respectively. and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0105] The present invention also discloses a battery system control system based on the SOX algorithm, comprising a memory and a processor, wherein the memory stores a battery system control method program based on the SOX algorithm, and when the battery system control method program based on the SOX algorithm is executed by the processor, the following steps are implemented:

[0106] Obtain the SOC value and SOH value of each battery cell, and determine whether to perform balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack;

[0107] Performing performance tests on the battery pack after equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data;

[0108] Obtaining a battery pack equalization evaluation index according to the equalization performance test data processing;

[0109] Obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing;

[0110] Testing the battery pack under different loads to obtain response stability test data, and obtaining a response stability evaluation index based on the response stability test data;

[0111] The battery system comprehensive evaluation index is obtained according to the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index, and the corresponding battery system control strategy data is obtained.

[0112] It should be noted that in this embodiment, SOX includes SOC and SOH, where SOC (State of Charge) represents the percentage of remaining power in the battery, and SOH (State of Health) is an indicator used to comprehensively evaluate the overall health status of the battery. First, the balance of the battery pack is determined based on the SOC data and SOH data of each battery cell. If it is determined to be unbalanced, it is adjusted, and the balanced performance of the battery pack after the balance adjustment is tested again. Since the imbalance of the battery pack is prone to thermal runaway, it is necessary to evaluate the thermal balance state of the battery pack and obtain the thermal balance state evaluation index. Since the UPS (uninterruptible power supply) maintains power output when the mains is interrupted, it is necessary to evaluate the stability of the battery pack's response under different loads when the mains is interrupted, obtain the response stability evaluation index, and finally obtain the battery system comprehensive evaluation index, and obtain the corresponding battery system control strategy. To achieve the purpose of regulating the battery system.

[0113] According to an embodiment of the present invention, the obtaining of the SOC value and the SOH value of each battery cell and determining whether to perform a balancing adjustment on the battery pack in combination with the SOC value and the SOH value of the battery pack includes:

[0114] Obtain the SOC value and SOH value of each battery cell and the SOC value and SOH value of the battery pack, and calculate the SOC deviation value and SOH deviation value of the battery pack;

[0115] Comparing the battery pack SOC deviation value with a preset battery pack SOC deviation threshold to obtain an SOC threshold comparison result;

[0116] Comparing the battery pack SOH deviation value with a preset battery pack SOH deviation threshold to obtain an SOH threshold comparison result;

[0117] If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, the battery system is subjected to battery pack balancing adjustment.

[0118] It should be noted that the SOC value and SOH value of each battery cell are compared with the SOC value and SOH value of the battery pack respectively to obtain the SOC difference and SOH difference, and the SOC difference with the largest value is used as the SOC deviation value of the battery pack, and the SOH difference with the largest value is used as the SOH deviation value. If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, it means that the battery pack has an unbalanced remaining capacity and an unbalanced health status, and the battery system is adjusted to balance the battery pack according to the preset adjustment method.

[0119] According to an embodiment of the present invention, the performance test is performed on the battery pack after the equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data, including:

[0120] The equalization performance test data includes voltage standard deviation, discharge capacity standard deviation, residual capacity standard deviation and internal resistance standard deviation;

[0121] The thermal balance performance test data includes maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

[0122] It should be noted that the standard deviations of the voltage, discharge capacity, internal resistance and remaining capacity of each battery cell after equalization adjustment are calculated respectively to obtain the voltage standard deviation, discharge capacity standard deviation, internal resistance standard deviation and remaining capacity standard deviation. The smaller the voltage standard deviation, discharge capacity standard deviation, internal resistance standard deviation and remaining capacity standard deviation, the better the consistency of the battery cells and the better the equalization effect. Among them, the discharge capacity refers to the total amount of electricity that can be discharged from the battery pack under test conditions starting from a fully charged state.

[0123] Thermal balance of a battery pack refers to a state in which the heat generated by the battery pack is equal to the heat dissipated during the operation of the battery pack, and the temperature of the battery pack remains relatively stable. However, unbalanced battery packs can easily lead to problems such as overcharging, overdischarging, and increased internal resistance, which will cause the battery to generate more heat. If this heat cannot be dissipated in time, it may cause thermal runaway. Therefore, it is very important to evaluate the thermal balance state of the battery pack. The temperature range is the difference between the highest temperature and the lowest temperature in the battery pack, which reflects the uniformity of the battery pack temperature. The smaller the temperature range, the more uniform the temperature of each part of the battery pack, and the better the thermal balance state. When the thermal balance state is good, the charge and discharge efficiency and output power of the battery pack should be maintained at normal levels. Thermal imbalance will reduce the charge and discharge efficiency and output power of the battery pack, and the temperature rise rate of the battery pack will increase. Therefore, the balance performance of the battery pack can be evaluated based on the voltage standard deviation, discharge capacity standard deviation, remaining capacity standard deviation, and internal resistance standard deviation, and the thermal balance performance of the battery pack can be evaluated based on the maximum temperature, temperature rise rate, temperature range, output power, and charge and discharge efficiency.

[0124] According to an embodiment of the present invention, the step of obtaining a battery pack equalization evaluation index according to the equalization performance test data includes:

[0125] The battery pack balance evaluation index is obtained according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation.

[0126] It should be noted that the balancing performance of the battery pack can be evaluated according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation to obtain the battery pack balancing evaluation index;

[0127] The calculation formula of the battery pack balance evaluation index is:

[0128] ;

[0129] in, is the battery pack balance evaluation index, , , and They are voltage standard deviation, discharge capacity standard deviation, remaining capacity standard deviation and internal resistance standard deviation. , , and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0130] According to an embodiment of the present invention, the step of obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing includes:

[0131] The thermal equilibrium state evaluation index is obtained based on the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

[0132] It should be noted that the thermal balance performance of the battery pack can be evaluated based on the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency to obtain a thermal balance state evaluation index;

[0133] The calculation formula of the thermal equilibrium state evaluation index is:

[0134] ;

[0135] in, is the thermal equilibrium state evaluation index, , , , and They are the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency. , , and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0136] According to an embodiment of the present invention, the battery pack is tested under different loads to obtain response stability test data, and the response stability evaluation index is obtained according to the response stability test data, including:

[0137] The response stability test data includes output voltage fluctuation rate, output frequency deviation rate and transient response time;

[0138] The response stability evaluation index is calculated based on the output voltage fluctuation rate, the output frequency deviation rate and the transient response time.

[0139] It should be noted that since the UPS (uninterruptible power supply) maintains power output when the mains is interrupted, it is necessary to evaluate the stability of the battery pack's response under different loads when the mains is interrupted to obtain a response stability evaluation index. Among them, the output voltage fluctuation rate can be obtained by calculating the ratio of the difference between the maximum voltage and the minimum voltage during the measurement period to the rated voltage, the output frequency deviation rate can be obtained by calculating the ratio of the difference between the measured frequency and the rated frequency to the rated frequency, and the transient response time can be expressed by the maximum value of the time required for the output voltage and frequency to return to the stable value under different loads.

[0140] The calculation formula of the response stability evaluation index is:

[0141] ;

[0142] in, is the response stability assessment index, , and They are output voltage fluctuation rate, output frequency deviation rate and transient response time respectively. , and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0143] According to an embodiment of the present invention, the battery system comprehensive evaluation index is obtained according to the battery pack balance evaluation index, the thermal balance state evaluation index and the response stability evaluation index, and the corresponding battery system control strategy data is obtained, including:

[0144] Comparing the battery system comprehensive evaluation index with a preset battery system comprehensive evaluation index threshold to obtain a threshold comparison result;

[0145] If the threshold comparison result does not meet the preset threshold comparison result requirements, the comprehensive evaluation level of the battery system is determined according to the range level to which the threshold comparison result belongs;

[0146] The comprehensive evaluation level of the battery system is input into the preset battery management system comprehensive control platform for matching and identification to obtain the battery system control strategy data.

[0147] It should be noted that the battery system comprehensive evaluation index is obtained by processing the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index;

[0148] The calculation formula of the battery system comprehensive evaluation index is:

[0149] ;

[0150] in, is the comprehensive evaluation index of the battery system, is the response stability assessment index, is the thermal equilibrium state evaluation index, is the battery pack balance evaluation index, , and is a preset weight coefficient (which can be obtained by querying the preset battery management system database).

[0151] It is worth mentioning that according to an embodiment of the present invention, it also includes:

[0152] Calculate based on the SOC data and SOH data of the battery pack to obtain a discharge evaluation index;

[0153] Comparing the discharge evaluation index with a preset discharge evaluation index threshold, and comparing the thermal equilibrium state evaluation index with a preset thermal equilibrium state evaluation index threshold;

[0154] If the discharge evaluation index is greater than or equal to the preset discharge evaluation index threshold and the thermal balance state evaluation index is greater than or equal to the preset thermal balance state evaluation index threshold, normal discharge is performed, otherwise discharge adjustment is performed.

[0155] It should be noted that in order to effectively protect the battery pack, the remaining power, battery pack health status and battery pack thermal balance status need to be considered simultaneously when discharging the battery pack. If the remaining power of the battery pack is low and the battery pack health status is poor, or the thermal balance problem is more serious, the discharge mode needs to be adjusted.

[0156] The calculation formula of the discharge evaluation index is:

[0157] ;

[0158] in, is the discharge assessment index, and They are SOC data and SOH data respectively. and is the preset characteristic coefficient (which can be obtained by querying the preset battery management system database).

[0159] The present invention discloses a battery system control method and system based on the SOX algorithm, which determines the battery pack balance state according to the SOX (SOC / SOH) data of the battery pack, and comprehensively considers the balance effect and thermal balance state of the battery pack after the balance adjustment, so as to realize the technology of fine control of the battery system.

[0160] 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.

[0161] 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.

[0162] 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.

Claims

1. A battery system control method based on SOX algorithm, characterized in that: The following steps are involved: Obtain the SOC value and SOH value of each battery cell, and determine whether to perform balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack; Performing performance tests on the battery pack after equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data; Obtaining a battery pack equalization evaluation index according to the equalization performance test data processing; Obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing; Testing the battery pack under different loads to obtain response stability test data, and obtaining a response stability evaluation index based on the response stability test data; Obtaining a comprehensive battery system evaluation index according to the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index, and obtaining corresponding battery system control strategy data; Obtain the SOC value and SOH value of each battery cell and the SOC value and SOH value of the battery pack, and calculate the SOC deviation value and SOH deviation value of the battery pack; Comparing the battery pack SOC deviation value with a preset battery pack SOC deviation threshold to obtain an SOC threshold comparison result; Comparing the SOH deviation value with a preset battery pack SOH deviation threshold to obtain an SOH threshold comparison result; If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, performing battery pack balancing adjustment on the battery system; The equalization performance test data includes voltage standard deviation, discharge capacity standard deviation, residual capacity standard deviation and internal resistance standard deviation; The thermal balance performance test data includes maximum temperature, temperature rise rate, temperature range, output power and charge and discharge efficiency; The battery pack balance evaluation index is obtained according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation.

2. The battery system control method based on the SOX algorithm according to claim 1 is characterized in that: The step of obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing includes: The thermal equilibrium state evaluation index is obtained based on the maximum temperature, temperature rise rate, temperature extreme difference, output power and charge and discharge efficiency.

3. The battery system control method based on the SOX algorithm according to claim 2 is characterized in that: The battery pack is tested under different loads to obtain response stability test data, and the response stability evaluation index is obtained according to the response stability test data, including: The response stability test data includes output voltage fluctuation rate, output frequency deviation rate and transient response time; The response stability evaluation index is calculated based on the output voltage fluctuation rate, the output frequency deviation rate and the transient response time.

4. The battery system control method based on the SOX algorithm according to claim 3 is characterized in that: The method of obtaining a comprehensive battery system evaluation index according to the battery pack balance evaluation index, the thermal balance state evaluation index and the response stability evaluation index, and obtaining corresponding battery system control strategy data, includes: Comparing the battery system comprehensive evaluation index with a preset battery system comprehensive evaluation index threshold to obtain a threshold comparison result; If the threshold comparison result does not meet the preset threshold comparison result requirements, the comprehensive evaluation level of the battery system is determined according to the range level to which the threshold comparison result belongs; The comprehensive evaluation level of the battery system is input into the preset battery management system comprehensive control platform for matching and identification to obtain the battery system control strategy data.

5. A battery system control system based on SOX algorithm, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a program of a battery system control method based on a SOX algorithm, and when the method program of battery system control based on a SOX algorithm is executed by the processor, the following steps are implemented: Obtain the SOC value and SOH value of each battery cell, and determine whether to perform balancing adjustment on the battery pack in combination with the SOC value and SOH value of the battery pack; Performing performance tests on the battery pack after equalization adjustment to obtain performance test data, including equalization performance test data and thermal balance performance test data; Obtaining a battery pack equalization evaluation index according to the equalization performance test data processing; Obtaining a thermal balance state evaluation index according to the thermal balance performance test data processing; Testing the battery pack under different loads to obtain response stability test data, and obtaining a response stability evaluation index based on the response stability test data; Obtaining a comprehensive battery system evaluation index according to the battery pack balance evaluation index, thermal balance state evaluation index and response stability evaluation index, and obtaining corresponding battery system control strategy data; Obtain the SOC value and SOH value of each battery cell and the SOC value and SOH value of the battery pack, and calculate the SOC deviation value and SOH deviation value of the battery pack; Comparing the battery pack SOC deviation value with a preset battery pack SOC deviation threshold to obtain an SOC threshold comparison result; Comparing the SOH deviation value with a preset battery pack SOH deviation threshold to obtain an SOH threshold comparison result; If both the SOC threshold comparison result and the SOH threshold comparison result do not meet the preset threshold comparison result requirements, performing battery pack balancing adjustment on the battery system; The equalization performance test data includes voltage standard deviation, discharge capacity standard deviation, residual capacity standard deviation and internal resistance standard deviation; The thermal balance performance test data includes maximum temperature, temperature rise rate, temperature range, output power and charge and discharge efficiency; The battery pack balance evaluation index is obtained according to the voltage standard deviation, the discharge capacity standard deviation, the remaining capacity standard deviation and the internal resistance standard deviation.

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