A method for detecting the power of a power battery

Abstract

The application discloses a kind of power battery electric quantity detection methods, belong to power battery electric quantity detection technical field.The method is by establishing about electric vehicle cloud database, analysis battery data and power data in the process of electric vehicle operation;Establish energy conversion analysis model, analyze the energy conversion efficiency when each battery module is discharged to different battery management unit, consider the efficiency loss of energy transfer when battery module is discharged to other battery management unit in hybrid layout power battery, improve the accuracy of power battery electric quantity detection;According to the energy conversion efficiency when each battery module is discharged to different battery management unit, the electric quantity use in each battery module is coordinated control, improve the energy utilization efficiency of electric battery;Through monitoring the battery loss of battery module, improve the safety performance of electric vehicle.

Description

Technical Field

[0001] This invention relates to the field of power battery charge detection technology, specifically a method for detecting the charge of a power battery. Background Technology

[0002] As a core component of new energy products, the performance of power batteries directly determines the product's range, power output, and lifespan. State of Charge (SOC) accurately estimates the remaining battery charge, improving the reliability of range prediction and preventing range anxiety caused by misjudgments. Simultaneously, SOC detection, a core function of the battery management system, prevents overcharging or over-discharging of the power battery, extending its safe lifespan. Furthermore, SOC data optimizes energy management, improves battery efficiency and energy recovery performance, and promotes full life-cycle battery management. With the development of intelligent connected vehicle technology, SOC, combined with big data analytics, enables remote monitoring and fault warning, providing crucial technical support for the safe, efficient, and sustainable development of new energy products.

[0003] For power batteries using distributed or hybrid layouts, the battery management system typically manages all battery modules as a whole and displays the total capacity of the battery modules. However, due to differences in environmental conditions and aging rates among different battery modules, the estimated total capacity may deviate from the actual capacity. Existing technologies consider the different rates of SOC decline under different aging conditions and make data-driven fine-tuning of the SOC decline rate by calculating the actual capacity decline rate. However, they do not consider the energy conversion relationship when each battery module supplies power. In distributed or hybrid layout power batteries, if one battery module supplies power to another, the efficiency loss in energy transfer will cause the estimated total capacity of the battery modules to be much higher than the actual total capacity, which significantly affects the user experience. Summary of the Invention

[0004] The purpose of this invention is to provide a method for detecting the charge of a power battery, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for detecting the charge of a power battery, the method comprising the following steps:

[0006] Step S10: Establish a cloud database for electric vehicles and obtain battery data and power data during the operation of electric vehicles; the battery data includes the discharge changes of each battery module to different battery management units and the temperature changes of each battery module; the power data includes the actual power consumption of each battery management unit.

[0007] Step S20: Based on the battery data and power data in the cloud database, establish an energy conversion analysis model to analyze the energy conversion efficiency of each battery module when discharging to different battery management units;

[0008] Step S30: Monitor the power of each battery module in the electric vehicle in real time and determine whether the power of each battery module has reached the safety threshold. If the power of each battery module is sufficient, continue monitoring and execute step S40. If the power of a battery module is insufficient, coordinate and control the power of each battery module to determine the real-time battery data during the operation of the electric vehicle and execute step S50.

[0009] Step S40: Determine and display the total power of the power battery based on the real-time power and temperature of each battery module in the electric vehicle and the energy conversion efficiency of each battery module when discharging to different battery management units.

[0010] Step S50: Determine and display the total power battery capacity based on the real-time battery data during the operation of the electric vehicle and the energy conversion efficiency of each battery module when discharging different battery management units.

[0011] Furthermore, the electric vehicle includes a battery control system; the battery control system includes several battery management units; the battery management units are used to supply power to various parts of the electric vehicle; each battery management unit has a unique corresponding battery module; the battery module is used to store and charge / discharge energy; wherein, when the battery modules have sufficient power, the battery control system controls each battery module to discharge to its unique corresponding battery management unit; when a battery module has insufficient power, the battery control system controls other battery modules to discharge to the battery management unit of the battery module with insufficient power.

[0012] Furthermore, the method steps of step S20 are as follows:

[0013] Step S21: Retrieve battery data and power data from the cloud database for analysis; based on the battery data, obtain the discharge amount of each battery module to different battery management units over time. change set and the temperature of each battery module over time Changes Based on the power data, the actual power consumption of each battery management unit over time is obtained. Changes ;

[0014] in, ; Indicates the first The discharge capacity of each battery module to different battery management units over time The set of changes; They represent the first The discharge capacity of each battery module to different battery management units over time Changes; Indicates the number of battery modules; i = 1, 2, ..., n;

[0015] Step S22: Establish an energy conversion analysis model. Based on the discharge amount and temperature of each battery module to different battery management units and the actual power consumption of each battery management unit, analyze the energy conversion efficiency of each battery module when discharging to different battery management units.

[0016] Furthermore, the method of step S30 is as follows: determine the safety threshold for insufficient power of each battery module, and compare the real-time power monitoring results of each battery module with the determined safety threshold; when the power of each battery module is greater than the safety threshold, continue monitoring; when the power of a battery module is less than the safety threshold, based on the energy conversion efficiency of each battery module when discharging different battery management units, control the battery module with the lowest energy conversion efficiency to discharge the battery management unit of the battery module whose power is less than the safety threshold.

[0017] Furthermore, the method for determining the total capacity of the power battery in step S40 is as follows: the capacity of each battery module in the electric vehicle under different battery module temperature differences is multiplied by the energy conversion efficiency of each battery module when discharging its unique corresponding battery management unit, and then the products are added together.

[0018] Furthermore, the method for determining the total power capacity of the power battery in step S50 is as follows: based on the real-time battery data during the operation of the electric vehicle, the discharge amount of each battery module to different battery management units and the temperature of each battery module are determined respectively. The discharge amount of each battery module to different battery management units under different battery module temperature differences and the energy conversion efficiency of each battery module when discharging with different battery management units are multiplied and then summed.

[0019] Furthermore, an interactive display platform is provided to digitally display battery and power data in the cloud database, the energy conversion efficiency of each battery module during discharge to different battery management units, and the total capacity of the power battery. Users can view these through the interactive display platform.

[0020] Furthermore, the energy conversion efficiency of each battery module when discharging to different battery management units is measured, and a battery wear safety reminder threshold is set. When the energy conversion efficiency of a battery module when discharging is lower than the battery wear safety reminder threshold, a warning message about severe battery wear is sent to the user.

[0021] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: By establishing an energy conversion analysis model, the energy conversion efficiency of each battery module when discharging to different battery management units is analyzed. The efficiency loss of energy transfer when battery modules discharge to other battery management units in distributed or hybrid power battery layouts is considered, thus improving the accuracy of power battery charge detection. Based on the energy conversion efficiency of each battery module when discharging to different battery management units, the power usage in each battery module is coordinated and controlled, improving the energy utilization efficiency of the electric battery. By monitoring the battery loss of the battery modules, the safety performance of electric vehicles is improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the steps of a power battery charge detection method according to the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1 The present invention provides the following technical solution:

[0025] Please see Figure 1 In this first embodiment, a method for detecting the charge of a power battery is provided, which includes the following steps:

[0026] Step S10: Establish a cloud database for electric vehicles and obtain battery data and power data during the operation of electric vehicles; the battery data includes the discharge changes of each battery module in the electric vehicle to different battery management units and the temperature changes of each battery module; the power data includes the actual power consumption of each battery management unit.

[0027] Furthermore, the electric vehicle includes a battery control system; the battery control system includes several battery management units; the battery management units are used to supply power to various parts of the electric vehicle; each battery management unit has a unique corresponding battery module; the battery module is used to store and charge / discharge energy; wherein, when the battery modules have sufficient power, the battery control system controls each battery module to discharge to its unique corresponding battery management unit; when a battery module has insufficient power, the battery control system controls other battery modules to discharge to the battery management unit of the battery module with insufficient power.

[0028] In this embodiment, the electric vehicle is an electric vehicle with a hybrid layout of power batteries. The electric vehicle battery control system includes several battery management units, which supply power to the electric vehicle's drive motor, communication system, and electronic control system, respectively. Each battery management unit has a unique corresponding battery module, thus realizing precise control of the electric vehicle's power supply.

[0029] Step S20: Based on the battery data and power data in the cloud database, establish an energy conversion analysis model to analyze the energy conversion efficiency of each battery module when discharging to different battery management units.

[0030] Specifically, the steps are as follows:

[0031] Step S21: Retrieve battery data and power data from the cloud database for analysis; based on the battery data, obtain the discharge amount of each battery module to different battery management units over time. change set and the temperature of each battery module over time Changes Based on the power data, the actual power consumption of each battery management unit over time is obtained. Changes ;

[0032] in, ; Indicates the first The discharge capacity of each battery module to different battery management units over time The set of changes; They represent the first The discharge capacity of each battery module to different battery management units over time Changes; Indicates the number of battery modules; i = 1, 2, ..., n;

[0033] Step S22: Establish an energy conversion analysis model. Based on the discharge amount and temperature of each battery module to different battery management units, and the actual power consumption of each battery management unit, analyze the energy conversion efficiency of each battery module when discharging to different battery management units, so as to satisfy the following formula:

[0034] ;

[0035] in, Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; Indicates the first The actual power consumption of each battery management unit varies over time. Changes; Indicates the first The battery module is for the first The discharge rate of each battery management unit over time Changes; Indicates the first The battery module is for the first The discharge rate of each battery management unit over time Changes; Indicates the first The temperature of each battery module over time Changes; The reference temperature used to calculate the effect of temperature; Represents the temperature coefficient; j, h = 1, 2, ..., n, and ; Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; arrive The time step is the interval between data acquisition frequencies for battery data.

[0036] In this implementation, the current and voltage of the battery module when discharging different battery management units are monitored to determine the changes in the discharge amount of each battery module to different battery management units; the current and voltage of the battery management unit when supplying power to various parts of the electric vehicle are monitored to determine the changes in the actual power consumption of each battery management unit.

[0037] It should be noted that temperature changes affect battery voltage, internal resistance, and capacity. Therefore, temperature compensation is necessary to ensure the accuracy of power estimation. The remaining battery capacity is compensated based on the current temperature to more accurately reflect the actual usable battery power. This is achieved by analyzing the retrieved battery and power data. In , and Substituting these values ​​into the above formulas, we can calculate the energy conversion efficiency of each battery module when discharging to different battery management units, and obtain the results. This takes into account the energy transfer efficiency loss when the battery module discharges to other battery management units in a hybrid power battery layout, making the subsequent detection of the total power of the electric battery more accurate.

[0038] Step S30: Monitor the power level of each battery module in the electric vehicle in real time and determine whether the power level of each battery module has reached the safety threshold. If the power level of each battery module is sufficient, continue monitoring and proceed to step S40. If the power level of a battery module is insufficient, coordinate and control the power usage of each battery module, determine the real-time battery data during the operation of the electric vehicle, and proceed to step S50.

[0039] Specifically, the method involves the following steps: determining the safety threshold for insufficient power in each battery module; comparing the real-time power monitoring results of each battery module with the determined safety threshold; continuing monitoring when the power of each battery module is greater than the safety threshold; and controlling the battery module with the lowest energy conversion efficiency to discharge the battery management unit whose power is less than the safety threshold, based on the energy conversion efficiency of each battery module when discharging different battery management units. By coordinating and controlling the power in each battery module, the energy utilization efficiency of the electric battery is improved.

[0040] Step S40: Determine and display the total power of the power battery based on the real-time power and temperature of each battery module in the electric vehicle and the energy conversion efficiency of each battery module when discharging to different battery management units.

[0041] Specifically, the method for determining the total capacity of the power battery in step S40 is as follows: the capacity of each battery module in the electric vehicle under different battery module temperature differences is multiplied by the energy conversion efficiency of each battery module when discharging its unique corresponding battery management unit, and then the products are added together.

[0042] It should be noted that in step S40, the total capacity of the power battery is calculated. The energy loss during battery module discharge to battery management unit was considered, and through... It can also reflect the battery loss in each battery module, among which, The smaller the size, the greater the battery loss in the battery module. The greater the rate of change, the more severe the battery loss in the battery module. Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; Indicates the first The battery module is for the first The discharge rate of each battery management unit over time The changes.

[0043] Step S50: Determine and display the total power battery capacity based on the real-time battery data during the operation of the electric vehicle and the energy conversion efficiency of each battery module when discharging different battery management units.

[0044] Furthermore, the method for determining the total power capacity of the power battery in step S50 is as follows: based on the real-time battery data during the operation of the electric vehicle, the discharge amount of each battery module to different battery management units and the temperature of each battery module are determined respectively. The discharge amount of each battery module to different battery management units under different battery module temperature differences and the energy conversion efficiency of each battery module when discharging with different battery management units are multiplied and then summed.

[0045] It should be noted that in step S40, the total capacity of the power battery is calculated. In hybrid power battery layouts, the efficiency loss of energy transfer when the battery module discharges to other battery management units is taken into account, thus improving the accuracy of power battery charge detection.

[0046] Furthermore, an interactive display platform is provided to digitally display battery and power data in the cloud database, the energy conversion efficiency of each battery module during discharge to different battery management units, and the total capacity of the power battery. Users can view these through the interactive display platform.

[0047] In this implementation, steps S10-S50 are repeated to update the total capacity of the power battery. At the same time, the energy conversion efficiency of each battery module when discharging to different battery management units is monitored, and a battery wear safety reminder threshold is set. When the energy conversion efficiency of a battery module when discharging is lower than the battery wear safety reminder threshold, a warning message about severe battery wear is sent to the user to facilitate battery replacement, thereby improving the safety performance of the electric vehicle and the user's operating experience.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for detecting the charge of a power battery, characterized in that: The method includes the following steps: Step S10: Establish a cloud database for electric vehicles and obtain battery data and power data during the operation of electric vehicles; the battery data includes the discharge changes of each battery module to different battery management units and the temperature changes of each battery module; the power data includes the actual power consumption of each battery management unit. Step S20: Based on the battery data and power data in the cloud database, establish an energy conversion analysis model to analyze the energy conversion efficiency of each battery module when discharging to different battery management units; The method steps of step S20 are as follows: Step S21: Retrieve battery data and power data from the cloud database for analysis; based on the battery data, obtain the discharge amount of each battery module to different battery management units over time. change set and the temperature of each battery module over time Changes Based on the power data, the actual power consumption of each battery management unit over time is obtained. Changes ; in, ; Indicates the first The discharge capacity of each battery module to different battery management units over time The set of changes; They represent the first The discharge capacity of each battery module to different battery management units over time Changes; Indicates the number of battery modules; i = 1, 2, ..., n; Step S22: Establish an energy conversion analysis model. Based on the discharge amount and temperature of each battery module to different battery management units, and the actual power consumption of each battery management unit, analyze the energy conversion efficiency of each battery module when discharging to different battery management units, so as to satisfy the following formula: ； in, Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; Indicates the first The actual power consumption of each battery management unit varies over time. Changes; Indicates the first The battery module is for the first The discharge rate of each battery management unit over time Changes; Indicates the first The battery module is for the first The discharge rate of each battery management unit over time Changes; Indicates the first The temperature of each battery module over time Changes; The reference temperature used to calculate the effect of temperature; Represents the temperature coefficient; j, h = 1, 2, ..., n, and ; Indicates the first The battery module is for the first The energy conversion efficiency of a battery management unit during discharge varies with time. Changes; arrive The time step is the data acquisition frequency interval for battery data; Step S30: Monitor the power of each battery module in the electric vehicle in real time and determine whether the power of each battery module has reached the safety threshold. If the power of each battery module is sufficient, continue monitoring and execute step S40. If the power of a battery module is insufficient, coordinate and control the power of each battery module to determine the real-time battery data during the operation of the electric vehicle and execute step S50. Step S40: Determine and display the total power of the power battery based on the real-time power and temperature of each battery module in the electric vehicle and the energy conversion efficiency of each battery module when discharging to different battery management units. Step S50: Determine and display the total power battery capacity based on the real-time battery data during the operation of the electric vehicle and the energy conversion efficiency of each battery module when discharging different battery management units.

2. The method for detecting the charge of a power battery according to claim 1, characterized in that: The electric vehicle includes a battery control system; the battery control system includes several battery management units; the battery management units are used to supply power to various parts of the electric vehicle; each battery management unit has a unique corresponding battery module; the battery module is used to store and charge / discharge energy; wherein, when the battery modules have sufficient power, the battery control system controls each battery module to discharge to its unique corresponding battery management unit; when a battery module has insufficient power, the battery control system controls other battery modules to discharge to the battery management unit of the battery module with insufficient power.

3. The method for detecting the charge of a power battery according to claim 2, characterized in that: The method of step S30 is as follows: determine the safety threshold for insufficient power of each battery module, and compare the real-time power monitoring results of each battery module with the determined safety threshold; when the power of each battery module is greater than the safety threshold, continue monitoring; when the power of a battery module is less than the safety threshold, based on the energy conversion efficiency of each battery module when discharging different battery management units, control the battery module with the lowest energy conversion efficiency to discharge the battery management unit of the battery module whose power is less than the safety threshold.

4. The method for detecting the charge of a power battery according to claim 3, characterized in that: The method for determining the total capacity of the power battery in step S40 is as follows: the capacity of each battery module in the electric vehicle under different battery module temperature differences is multiplied by the energy conversion efficiency of each battery module when discharging its unique corresponding battery management unit, and then the products are added together.

5. The method for detecting the charge of a power battery according to claim 4, characterized in that: The method for determining the total power capacity of the power battery in step S50 is as follows: based on the real-time battery data during the operation of the electric vehicle, the discharge amount of each battery module to different battery management units and the temperature of each battery module are determined respectively. The discharge amount of each battery module to different battery management units under different battery module temperature differences and the energy conversion efficiency of each battery module when discharging with different battery management units are multiplied and then summed.

6. The method for detecting the charge of a power battery according to claim 1, characterized in that: An interactive display platform is provided to digitally display battery and power data in the cloud database, the energy conversion efficiency of each battery module when discharging to different battery management units, and the total capacity of the power battery. Users can view these through the interactive display platform.

7. The method for detecting the charge of a power battery according to claim 1, characterized in that: Monitor the energy conversion efficiency of each battery module when discharging to different battery management units, set a battery wear safety reminder threshold, and send a warning message to the user when the energy conversion efficiency of a battery module is lower than the battery wear safety reminder threshold.

Images