Method and System for Battery Monitoring Based on Automotive Battery Parameters

Abstract

The present application discloses a battery monitoring method and system based on automotive battery parameters, which measures the actual surface temperature of an undormant automotive battery. If the actual surface temperature is less than or equal to the surface temperature threshold, the undormant current and undormant voltage of the undormant automotive battery are tested, and a dynamic characteristic equation of the undormant automotive battery is constructed based on the undormant current and undormant voltage. The theoretical surface temperature is obtained by solving the dynamic characteristic equation, and a surface temperature difference gradient value is constructed using the actual surface temperature and the theoretical surface temperature. If the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, the undormant automotive battery continues to operate. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, the state of the undormant automotive battery is adjusted to the dormant state, and the backup battery of the dormant automotive battery is activated to replace the dormant automotive battery to operate. In this way, the safety of automotive battery monitoring can be improved.

Description

Technical Field

[0001] This application relates to the technical field of battery control, and more specifically, to a battery monitoring method and system based on automotive battery parameters. Background Art

[0002] With the development of science and technology, electric vehicles have gradually been applied. The main principle of electric vehicles is to use automotive batteries to replace fuel to supply continuous driving power. During the operation of electric vehicles, due to factors such as driving time, driving environment, driving habits of drivers, and the service life of electric vehicles, a series of impacts will be imposed on automotive batteries. Especially when factors such as long driving time and harsh driving environment occur, the temperature of automotive batteries will rise, leading to risks such as spontaneous combustion and explosion of automotive batteries.

[0003] Currently, the commonly used method for realizing battery safety monitoring based on automotive battery parameters mainly relies on the moment supervision method, that is, the surface temperature of the automotive battery is monitored at all times through a temperature measurement unit. When the surface temperature of the automotive battery is too high, the automotive battery is stopped from supplying energy to the vehicle, and the cooling unit is used to cool the automotive battery until the temperature of the automotive battery is lower than the temperature threshold, and then the automotive battery is used to supply energy again.

[0004] Although the above method can achieve battery safety monitoring, high-risk automotive batteries are not only reflected by the surface temperature, but also by the temperature change range and frequency on the battery surface. According to research, too rapid temperature change of automotive batteries within a short period of time will lead to poor internal stability of the batteries.

[0005] Therefore, generally speaking, only monitoring the surface temperature of automotive batteries through a temperature measurement unit has relatively simple means and is difficult to achieve more comprehensive battery safety monitoring. Therefore, a battery monitoring method that can combine the temperature change frequency of the battery and the surface temperature of the battery is expected. Summary of the Invention

[0006] In order to solve the above technical problems, this application is proposed. The embodiments of this application provide a battery monitoring method and system based on automotive battery parameters. Its main purpose is to construct a dynamic characteristic equation of the automotive battery, and obtain the surface temperature difference gradient value of the automotive battery within a specified time period by solving the dynamic characteristic equation, so as to comprehensively judge the safety of the automotive battery according to the magnitude of the surface temperature difference gradient value and the actual surface temperature of the automotive battery.

[0007] According to one aspect of this application, a battery monitoring method based on automotive battery parameters is provided, which includes:

[0008] Receive the parameter monitoring instruction of the vehicle battery, and determine the non-dormant vehicle battery according to the parameter monitoring instruction. Among them, the power supply circuit where the non-dormant vehicle battery is located consists of a first resistor, a second resistor, a third resistor, a power supply, a first capacitor, and a second capacitor. Moreover, the first resistor and the first capacitor are connected in parallel to form a first parallel circuit, the second resistor and the second capacitor are connected in parallel to form a second parallel circuit, and the first parallel circuit, the second parallel circuit, and the third resistor are connected in series to the non-dormant vehicle battery;

[0009] Start the temperature measurement unit of the non-dormant vehicle battery, and use the temperature measurement unit to measure the actual surface temperature of the non-dormant vehicle battery at the current moment;

[0010] Judge the magnitude relationship between the actual surface temperature and the preset surface temperature threshold;

[0011] If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, test the non-dormant current and non-dormant voltage of the non-dormant vehicle battery at the current moment;

[0012] Determine the monitoring period of the non-dormant vehicle battery, and construct the dynamic characteristic equation of the non-dormant vehicle battery according to the monitoring period, the non-dormant current, and the non-dormant voltage;

[0013] Solve the theoretical surface temperature of the non-dormant vehicle battery according to the dynamic characteristic equation, and construct the surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature;

[0014] Judge the magnitude relationship between the surface temperature difference gradient value and the preset surface temperature difference gradient threshold;

[0015] If the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, continue to use the non-dormant vehicle battery to work;

[0016] If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, then adjust the state of the non-dormant vehicle battery to the dormant state to obtain the dormant vehicle battery, and start the backup battery of the dormant vehicle battery to replace the dormant vehicle battery to work.

[0017] In the above method for monitoring the battery based on the vehicle battery parameters, the determining the non-dormant vehicle battery according to the parameter monitoring instruction includes:

[0018] Connect the control system of the vehicle according to the parameter monitoring instruction;

[0019] Obtain all the vehicle batteries that supply power to the vehicle from the control system to get the power supply battery set;

[0020] According to the power supply state of the power supply battery at the current moment, divide the power supply battery set into non-dormant vehicle batteries and dormant vehicle batteries;

[0021] Determine all non-dormant vehicle batteries at the current moment.

[0022] In the above battery monitoring method implemented based on vehicle battery parameters, the dynamic characteristic equation is:

[0023]

[0024] where t represents the current moment, t + 1 represents the next moment of the current moment, V1(t + 1) and V2(t + 1) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the next moment of the current moment, V1(t) and V2(t) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the current moment, T represents the sampling period for non-dormant vehicle batteries, C1 represents the capacitance value of the first capacitor, C2 represents the capacitance value of the second capacitor, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, R3 represents the resistance value of the third resistor, I e (t) represents the current value of the non-dormant vehicle battery at the current moment, V OC (t) represents the open-circuit voltage of the non-dormant vehicle battery, V e (k) represents the supply voltage supplied by the power supply circuit to the electric vehicle at the current moment.

[0025] In the above battery monitoring method implemented based on vehicle battery parameters, the calculation method of the sampling period is:

[0026]

[0027] where f represents the current frequency of the power supply circuit.

[0028] In the above battery monitoring method implemented based on vehicle battery parameters, the method for solving the theoretical surface temperature of the non-dormant vehicle battery according to the dynamic characteristic equation includes:

[0029] Obtain the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment of the current moment;

[0030] Calculate the ambient temperature change value according to the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment of the current moment;

[0031] Transform the dynamic characteristic equation according to the ambient temperature change value and the principle of energy conservation to obtain the calculation formula for the theoretical surface temperature of the non-dormant vehicle battery;

[0032] Solve the theoretical surface temperature calculation formula to obtain the theoretical surface temperature of the non-dormant vehicle battery.

[0033] In the above battery monitoring method implemented based on vehicle battery parameters, the conversion of the dynamic characteristic equation according to the ambient temperature change value and the principle of energy conservation to obtain the theoretical surface temperature calculation formula of the non-dormant vehicle battery includes:

[0034]

[0035] Among them, T s (t + 1) represents the theoretical surface temperature of the non-dormant vehicle battery at the next moment, and T C (t) represents the actual surface temperature of the non-dormant vehicle battery at the current moment, ΔT represents the ambient temperature change value, and C s represents the heat capacity of the non-dormant vehicle battery.

[0036] In the above battery monitoring method implemented based on vehicle battery parameters, the construction of the surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature includes:

[0037] Obtain the actual surface temperature and the theoretical surface temperature at each moment after receiving the parameter monitoring instruction. Among them, T s (i) represents the theoretical surface temperature at the i-th moment, and T c (i) represents the actual surface temperature at the i-th moment;

[0038] Construct an error function between the theoretical surface temperature and the actual surface temperature;

[0039] Derive the error function to obtain the surface temperature difference gradient value.

[0040] In the above battery monitoring method implemented based on vehicle battery parameters, the construction of the error function between the theoretical surface temperature and the actual surface temperature includes:

[0041] Construct an error function based on the gradient descent algorithm:

[0042]

[0043] Among them, J represents the error function between the theoretical surface temperature and the actual surface temperature, m is the total number of all moments after receiving the parameter monitoring instruction, and θ represents the algorithm parameter of the gradient descent algorithm.

[0044] In the above battery monitoring method implemented based on vehicle battery parameters, the adjustment of the state of the non-dormant vehicle battery to the dormant state to obtain a dormant vehicle battery and starting the backup battery of the dormant vehicle battery to replace the dormant vehicle battery to work includes:

[0045] Turn off the power supply circuit where the non-dormant vehicle battery is located;

[0046] After successfully shutting down the power supply circuit of the non-dormant vehicle battery, adjust the non-dormant vehicle battery to a dormant vehicle battery, and start the cooling unit corresponding to the dormant vehicle battery;

[0047] Use the cooling unit to continuously reduce the surface temperature of the dormant vehicle battery until the surface temperature of the dormant vehicle battery is less than the set dormant temperature threshold, and at the same time

[0048] Select all the dormant vehicle batteries from the energy supply battery set;

[0049] Measure the supply voltages of all the dormant vehicle batteries in sequence, and select the dormant vehicle battery with the largest supply voltage as the backup battery to replace the dormant vehicle battery to work.

[0050] According to another aspect of the present application, there is provided a battery monitoring system implemented based on vehicle battery parameters, which includes:

[0051] An actual surface temperature measurement module, configured to receive a parameter monitoring instruction of the vehicle battery, determine a non-dormant vehicle battery according to the parameter monitoring instruction. Wherein, the power supply circuit where the non-dormant vehicle battery is located is composed of a first resistor, a second resistor, a third resistor, a power supply, a first capacitor, and a second capacitor, and the first resistor and the first capacitor are connected in parallel to construct a first parallel circuit, the second resistor and the second capacitor are connected in parallel to construct a second parallel circuit, and the first parallel circuit, the second parallel circuit, and the third resistor are connected in series to the non-dormant vehicle battery. Start the temperature measurement unit of the non-dormant vehicle battery, and use the temperature measurement unit to measure the actual surface temperature of the non-dormant vehicle battery at the current moment;

[0052] A current and voltage measurement module, configured to judge the magnitude relationship between the actual surface temperature and a preset surface temperature threshold. If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, test the non-dormant current and non-dormant voltage of the non-dormant vehicle battery at the current moment;

[0053] A dynamic characteristic equation construction module, configured to determine the monitoring period of the non-dormant vehicle battery, and construct a dynamic characteristic equation of the non-dormant vehicle battery according to the monitoring period, the non-dormant current, and the non-dormant voltage;

[0054] A temperature difference judgment module, configured to solve the theoretical surface temperature of the non-dormant vehicle battery according to the dynamic characteristic equation, construct a surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature, and judge the magnitude relationship between the surface temperature difference gradient value and a preset surface temperature difference gradient threshold;

[0055] The battery status adjustment module is used to continue using the non-dormant vehicle battery if the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, the status of the non-dormant vehicle battery is adjusted to the dormant state to obtain a dormant vehicle battery, and the backup battery of the dormant vehicle battery is activated to replace the dormant vehicle battery to work.

[0056] Compared with the prior art, the battery monitoring method and system based on vehicle battery parameters provided by the present application first receives a parameter monitoring instruction of the vehicle battery, and determines a non-dormant vehicle battery according to the parameter monitoring instruction. It should be noted that a non-dormant vehicle battery refers to a battery that provides electrical energy to the vehicle. Corresponding to the non-dormant vehicle battery is a dormant vehicle battery, where the dormant vehicle battery is temporarily dormant due to temperature and the stored electric quantity, and the main function of the power supply circuit where the non-dormant vehicle battery is located is to conduct the electrical energy of the non-dormant vehicle battery to the vehicle drive system. The temperature measurement unit of the non-dormant vehicle battery is activated, and the actual surface temperature of the non-dormant vehicle battery at the current moment is measured by using the temperature measurement unit, and the magnitude relationship between the actual surface temperature and the preset surface temperature threshold is judged. If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, the non-dormant current and non-dormant voltage of the non-dormant vehicle battery at the current moment are measured. It should be emphasized that in the traditional battery temperature monitoring method, when the actual surface temperature is less than or equal to the surface temperature threshold, the non-dormant vehicle battery is still used as the power supply battery of the vehicle. However, in the embodiment of the present invention, in order to ensure the safety of the non-dormant vehicle battery, it is also necessary to further calculate the surface temperature difference gradient value of the non-dormant vehicle battery, and judge the safety of the battery according to the surface temperature difference gradient value. Therefore, the monitoring period of the non-dormant vehicle battery is determined, and a dynamic characteristic equation of the non-dormant vehicle battery is constructed according to the monitoring period, non-dormant current and non-dormant voltage. The theoretical surface temperature of the non-dormant vehicle battery is solved according to the dynamic characteristic equation, and the surface temperature difference gradient value is constructed by using the actual surface temperature and the theoretical surface temperature, and the magnitude relationship between the surface temperature difference gradient value and the preset surface temperature difference gradient threshold is judged. When the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, the non-dormant vehicle battery is continued to be used. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, the status of the non-dormant vehicle battery is adjusted to the dormant state to obtain a dormant vehicle battery, and the backup battery of the dormant vehicle battery is activated to replace the dormant vehicle battery to work. Therefore, the battery monitoring method and system based on vehicle battery parameters provided by the embodiment of the present invention can more accurately monitor the battery temperature and improve the battery safety during vehicle driving because the surface temperature difference gradient threshold of the battery is considered. Brief Description of the Drawings

[0057] The above and other objects, features, and advantages of the present application will become more apparent by describing the embodiments of the present application in more detail with reference to the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0058] Figure 1 FIG. is a flowchart of a battery monitoring method based on automotive battery parameters according to an embodiment of the present application.

[0059] Figure 2 FIG. is a flowchart of one of the steps in a battery monitoring method based on automotive battery parameters according to an embodiment of the present application.

[0060] Figure 3 FIG. is a flowchart of another step in a battery monitoring method based on automotive battery parameters according to an embodiment of the present application.

[0061] Figure 4 FIG. is a block diagram of a battery monitoring system based on automotive battery parameters according to an embodiment of the present application. Detailed Embodiments

[0062] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0063] The embodiments of the present application provide a battery monitoring method based on automotive battery parameters. The execution subject of the battery monitoring method based on automotive battery parameters includes, but is not limited to, at least one of electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by the embodiments of the present application. In other words, the battery monitoring method based on automotive battery parameters can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to: a single server, a server cluster, a cloud server, or a cloud server cluster, etc.

[0064] Embodiment:

[0065] Referring to Figure 1 as shown, it is a schematic flowchart of a battery monitoring method based on automotive battery parameters provided by an embodiment of the present invention. In this embodiment, the battery monitoring method based on automotive battery parameters includes:

[0066] S1. Receive the parameter monitoring instruction of the vehicle battery, and determine the non-dormant vehicle battery according to the parameter monitoring instruction. The power supply circuit of the non-dormant vehicle battery consists of a first resistor, a second resistor, a third resistor, a power supply, a first capacitor, and a second capacitor. The first resistor and the first capacitor are connected in parallel to form a first parallel circuit, the second resistor and the second capacitor are connected in parallel to form a second parallel circuit, and the first parallel circuit, the second parallel circuit, and the third resistor are connected in series to the power supply;

[0067] It can be explained that the parameter monitoring instruction described in the embodiments of the present invention is generally initiated by the driver of an electric vehicle. Exemplarily, Xiao Zhang currently plans to drive an electric vehicle on a long journey, so he initiates a parameter monitoring instruction during the driving process, aiming to obtain a series of parameter data of the battery that drives the electric vehicle to run.

[0068] Further, referring to Figure 2 as shown, the determining the non-dormant vehicle battery according to the parameter monitoring instruction includes:

[0069] S11. Connect to the control system of the vehicle according to the parameter monitoring instruction;

[0070] S12. Obtain all the vehicle batteries that supply electrical energy to the vehicle from the control system to obtain an energy supply battery set;

[0071] S13. Divide the energy supply battery set into non-dormant vehicle batteries and dormant vehicle batteries according to the energy supply state of the energy supply battery at the current moment;

[0072] S14. Determine all the non-dormant vehicle batteries at the current moment.

[0073] It should be emphasized that the non-dormant vehicle battery is determined according to the parameter monitoring instruction, where the non-dormant vehicle battery refers to the vehicle battery that is currently supplying energy to the vehicle. Generally, there are multiple batteries driving the vehicle. For example, the electric vehicle driven by Xiao Zhang above has a total of 10 batteries. The current power supplies for the operation of the electric vehicle are the 1st, 3rd, and 10th batteries respectively. Then the 1st, 3rd, and 10th batteries are called non-dormant vehicle batteries.

[0074] It should be understood that the main function of each non-dormant vehicle battery is to be an electrical energy provider, that is, to provide electrical energy for the movement of the vehicle. However, in order to ensure the normal operation of the battery and prevent phenomena such as too high internal resistance or too low voltage, the non-dormant vehicle batteries described in the embodiments of the present invention are all connected to the power supply circuit.

[0075] Further, while the non-dormant automotive battery serves as the power source for the power supply circuit, the power supply circuit further includes a first resistor, a second resistor, a third resistor, a power source, a first capacitor, and a second capacitor. The main purpose of the third resistor is to prevent the non-dormant automotive battery from being broken down. Therefore, in the power supply circuit, the non-dormant automotive battery is connected in series with the third resistor. At the same time, in order to prevent the voltage of the non-dormant automotive battery from being too low when supplying power to the vehicle, the first resistor and the first capacitor are connected in parallel to form a first parallel circuit, and the second resistor and the second capacitor are connected in parallel to form a second parallel circuit. The purpose is to release electrical energy through the two groups of capacitors when the voltage is too low when supplying power to the vehicle, so as to ensure the continuous operation of the vehicle.

[0076] S2. Activate the temperature measurement unit of the non-dormant automotive battery, and use the temperature measurement unit to measure the actual surface temperature of the non-dormant automotive battery at the current moment;

[0077] It can be understood that during the operation of an electric vehicle, in order to prevent risks such as spontaneous combustion caused by the overheating of the non-dormant automotive battery, it is necessary to monitor the battery temperature of the non-dormant automotive battery at all times. The traditional method mainly monitors the actual surface temperature of the non-dormant automotive battery. Exemplarily, for example, in Xiao Zhang's car, the current non-dormant automotive batteries are the 1st, 3rd, and 10th ones. Then, measure the surface temperatures of the 1st, 3rd, and 10th batteries respectively, and judge their relationship with the preset surface temperature threshold. If there is a battery with a surface temperature higher than the surface temperature threshold, stop the operation of this battery or take cooling measures.

[0078] Although the above method can monitor the non-dormant automotive battery based on temperature parameters, it does not consider the actual operating conditions of the vehicle. For example, the voltage change value and current change value at a certain moment will cause the temperature to rise too high at that moment. Since the risk caused by the high temperature rise in a short period of time to the non-dormant automotive battery is higher, the embodiments of the present invention consider this situation and first measure the actual surface temperature of the non-dormant automotive battery at the current moment through the temperature measurement unit.

[0079] Exemplarily, the actual surface temperatures of the 1st, 3rd, and 10th batteries are measured to be 95 degrees, 120 degrees, and 80 degrees respectively.

[0080] S3. Judge the magnitude relationship between the actual surface temperature and the preset surface temperature threshold.

[0081] It can be understood that the magnitude of the actual surface temperature can always reflect the safety condition of the non-dormant automotive battery at the current moment. Exemplarily, if the preset surface temperature threshold is 100 degrees, then the 1st battery with 95 degrees and the 10th battery with 80 degrees do not exceed the surface temperature threshold, while the 3rd battery with 120 degrees is higher than the surface temperature threshold.

[0082] S4. If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, test the undormant current and undormant voltage of the undormant vehicle battery at the current moment;

[0083] Exemplarily, within the power supply circuit, the measured undormant current and undormant voltage of the first undormant vehicle battery at the current moment are 10 A and 210 V respectively.

[0084] S5. Determine the monitoring period for the undormant vehicle battery, and construct a dynamic characteristic equation for the undormant vehicle battery based on the monitoring period, undormant current, and undormant voltage;

[0085] Specifically, the dynamic characteristic equation is:

[0086]

[0087] where t represents the current moment, t + 1 represents the next moment of the current moment, V1(t + 1) and V2(t + 1) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the next moment of the current moment, V1(t) and V2(t) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the current moment, T represents the sampling period for the undormant vehicle battery, C1 represents the capacitance value of the first capacitor, C2 represents the capacitance value of the second capacitor, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, R3 represents the resistance value of the third resistor, I e (t) represents the current value of the undormant vehicle battery at the current moment, V OC (t) represents the open-circuit voltage of the undormant vehicle battery, V e (k) represents the supply voltage supplied by the power supply circuit to the electric vehicle at the current moment.

[0088] Furthermore, the calculation method for the sampling period is:

[0089]

[0090] where f represents the current frequency of the power supply circuit. Among them, the value calculated according to is called the capacitive reactance modulus of the first capacitor.

[0091] It should be explained that the supply voltage supplied to the electric vehicle at the current moment is actually the comprehensive value of the open-circuit voltage of the undormant vehicle battery, the voltage of the first parallel circuit, the voltage of the second parallel circuit, and the voltage of the third resistor. Therefore, strictly speaking, the electrical energy obtained during the operation of the electric vehicle comes from the power supply circuit, and when the power supply circuit continuously supplies electrical energy, there is a risk that the temperature of the undormant vehicle battery in the power supply circuit will gradually increase.

[0092] Furthermore, there are two types of temperatures for an active vehicle battery. One is the surface temperature of the active vehicle battery, and the other is the central temperature of the active vehicle battery. Here, the surface refers to the surface of the active vehicle battery that contacts the environment, while the center refers to the core point that generates electrical energy at the center of the active vehicle battery, which is a closed position point that does not contact the environment.

[0093] Therefore, in the embodiments of the present invention, when monitoring an active vehicle battery, the central temperature and the surface temperature of the active vehicle battery are continuously monitored, so as to achieve more refined battery management.

[0094] S6. Solve the theoretical surface temperature of the active vehicle battery according to the dynamic characteristic equation, and construct a surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature;

[0095] Specifically, the solving of the theoretical surface temperature of the active vehicle battery according to the dynamic characteristic equation includes:

[0096] Obtain the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment of the current moment;

[0097] Calculate the ambient temperature change value according to the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment of the current moment;

[0098] Transform the dynamic characteristic equation according to the ambient temperature change value and the principle of conservation of energy to obtain a calculation formula for the theoretical surface temperature of the active vehicle battery;

[0099] Solve the calculation formula for the theoretical surface temperature to obtain the theoretical surface temperature of the active vehicle battery.

[0100] It should be explained that the main reason for the increase in the theoretical surface temperature of the active vehicle battery is that electrical energy is supplied to the power supply circuit, which causes the temperatures of the first resistor, the second resistor, the third resistor, the power supply, the first capacitor, the second capacitor, and the environment where the power supply circuit is located to all increase. Therefore, first obtain the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment of the current moment, so as to know the ambient temperature change value.

[0101] Furthermore, the transforming of the dynamic characteristic equation according to the ambient temperature change value and the principle of conservation of energy to obtain a calculation formula for the theoretical surface temperature of the active vehicle battery includes:

[0102]

[0103] Among them, T s (t + 1) represents the theoretical surface temperature of the active vehicle battery at the next moment, T c(t) represents the actual surface temperature of the non-dormant vehicle battery at the current moment, ΔT represents the ambient temperature change value, and C s represents the heat capacity of the non-dormant vehicle battery.

[0104] Exemplarily, the actual surface temperature of the first non-dormant vehicle battery measured at the 1st minute is 95 degrees, and the actual surface temperature measured at the 10th minute is 110 degrees. However, according to the above theoretical surface temperature calculation formula, the theoretical surface temperature of the first non-dormant vehicle battery at the 10th minute should be 100 degrees. Therefore, there is an error between the theoretical surface temperature obtained by theoretical calculation and the actual surface temperature obtained by actual measurement.

[0105] It should be emphasized that the phenomenon of the error between the theoretical surface temperature and the actual surface temperature is quite common. However, if the error is too large or the change amplitude of the error is too high, it indicates that the internal structure of the non-dormant vehicle battery is not stable enough, and its instability will be manifested through temperature. Generally speaking, there are various reasons for the abnormal temperature change of the non-dormant vehicle battery, including but not limited to improper driving by the driver, too rapid change of the ambient temperature where the vehicle is located, insufficient electric energy of the non-dormant vehicle battery, etc. Therefore, in the embodiments of the present invention, the surface temperature difference gradient value is first constructed according to the actual surface temperature and the theoretical surface temperature, and the main function of the surface temperature difference gradient value is to judge the internal stability of the non-dormant vehicle battery.

[0106] Specifically, the constructing the surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature includes:

[0107] Obtain the actual surface temperature and the theoretical surface temperature at each moment after receiving the parameter monitoring instruction, where T s (i) represents the theoretical surface temperature at the i-th moment, and T c (i) represents the actual surface temperature at the i-th moment;

[0108] Construct the error function between the theoretical surface temperature and the actual surface temperature;

[0109] Derive the error function to obtain the surface temperature difference gradient value.

[0110] Further, the constructing the error function between the theoretical surface temperature and the actual surface temperature includes:

[0111] Construct the error function based on the gradient descent algorithm:

[0112]

[0113] Among them, J represents the error function between the theoretical surface temperature and the actual surface temperature, m is the total number of all moments after receiving the parameter monitoring instruction, and θ represents the algorithm parameter of the gradient descent algorithm.

[0114] It is understandable that after taking the derivative of the error function based on the algorithm parameters, the surface temperature difference gradient value of the non-dormant vehicle battery within the time period from [1, m] can be obtained.

[0115] S7. Determine the magnitude relationship between the surface temperature difference gradient value and the preset surface temperature difference gradient threshold.

[0116] S8. If the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, continue to use the non-dormant vehicle battery for operation.

[0117] It is understandable that if the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, it indicates that within the time period from [1, m], the temperature change amplitude of the non-dormant vehicle battery is relatively low. And combined with the judgment in step S3, it can be known that on the premise of a relatively low temperature change amplitude, the actual surface temperature is also less than or equal to the surface temperature threshold. Therefore, the stability of the non-dormant vehicle battery is relatively high, and it can continue to supply electrical energy to the vehicle.

[0118] S9. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, adjust the state of the non-dormant vehicle battery to the dormant state to obtain a dormant vehicle battery, and start the backup battery of the dormant vehicle battery to replace the dormant vehicle battery for operation.

[0119] It should be explained that the surface temperature threshold can generally be understood as the critical temperature value at the dangerous edge of the battery. If the surface temperature of the non-dormant vehicle battery during operation has reached the critical temperature value at the dangerous edge, it indicates that the non-dormant vehicle battery needs to suspend power supply and be cooled, or if the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, it indicates that the temperature change frequency and amplitude of the non-dormant vehicle battery are too high. This phenomenon will cause a certain probability of mutation in the structure of the non-dormant vehicle battery, resulting in the risk of spontaneous combustion or explosion. Therefore, specifically, refer to Figure 3 As shown, the adjustment of the state of the non-dormant vehicle battery to the dormant state to obtain a dormant vehicle battery, and starting the backup battery of the dormant vehicle battery to replace the dormant vehicle battery for operation includes:

[0120] S91. Turn off the power supply circuit where the non-dormant vehicle battery is located;

[0121] S92. After successfully turning off the power supply circuit of the non-dormant vehicle battery, adjust the non-dormant vehicle battery to a dormant vehicle battery, and start the corresponding cooling unit of the dormant vehicle battery;

[0122] S93. Continuously reduce the surface temperature of the dormant vehicle battery using the cooling unit until the surface temperature of the dormant vehicle battery is less than the set dormant temperature threshold, and at the same time

[0123] S94. Select all the dormant vehicle batteries from the energy supply batteries;

[0124] S95. Measure the supply voltages of all the dormant vehicle batteries in sequence, and select the dormant vehicle battery with the maximum supply voltage as the backup battery to replace the dormant vehicle battery to work.

[0125] It can be understood that each vehicle battery supplies electrical energy to the vehicle through the energy supply circuit. Therefore, when it is found through measurement during the operation of the vehicle that the actual surface temperature of the vehicle battery is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, it indicates that the vehicle battery needs to be cooled in time to prevent risks such as battery explosion and spontaneous combustion. In addition, to ensure that the vehicle still has electrical energy supply, at the same time, select the dormant vehicle battery with the maximum supply voltage as the backup battery for electrical energy supply.

[0126] Compared with the prior art, the battery monitoring method and system based on automotive battery parameters provided by the present application first receive a parameter monitoring instruction for the automotive battery, and determine the non-dormant automotive battery according to the parameter monitoring instruction. It should be noted that the non-dormant automotive battery refers to the battery that provides electrical energy to the vehicle. Corresponding to the non-dormant automotive battery is the dormant automotive battery, where the dormant automotive battery is temporarily dormant due to temperature and the stored power, and the main function of the power supply circuit where the non-dormant automotive battery is located is to conduct the electrical energy of the non-dormant automotive battery to the vehicle drive system. Start the temperature measurement unit of the non-dormant automotive battery, and use the temperature measurement unit to measure the actual surface temperature of the non-dormant automotive battery at the current moment, and judge the magnitude relationship between the actual surface temperature and the preset surface temperature threshold. If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, test the non-dormant current and non-dormant voltage of the non-dormant automotive battery at the current moment. It should be emphasized that in the traditional battery temperature monitoring method, when the actual surface temperature is less than or equal to the surface temperature threshold, the non-dormant automotive battery will continue to be used as the power supply battery of the vehicle. However, in the embodiments of the present invention, in order to ensure the safety of the non-dormant automotive battery, it is also necessary to further calculate the surface temperature difference gradient value of the non-dormant automotive battery, and judge the safety of the battery according to the surface temperature difference gradient value. Therefore, determine the monitoring period of the non-dormant automotive battery, construct a dynamic characteristic equation of the non-dormant automotive battery according to the monitoring period, non-dormant current and non-dormant voltage, solve the theoretical surface temperature of the non-dormant automotive battery according to the dynamic characteristic equation, construct the surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature, and judge the magnitude relationship between the surface temperature difference gradient value and the preset surface temperature difference gradient threshold. When the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, continue to use the non-dormant automotive battery to work. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, then adjust the state of the non-dormant automotive battery to the dormant state to obtain a dormant automotive battery, and start the backup battery of the dormant automotive battery to replace the dormant automotive battery to work. Therefore, the battery monitoring method and system based on automotive battery parameters provided by the embodiments of the present invention can more accurately monitor the battery temperature and improve the battery safety during vehicle driving because the surface temperature difference gradient threshold of the battery is considered.

[0127] Exemplary system

[0128] Figure 4 is a block diagram of a battery monitoring system based on automotive battery parameters according to an embodiment of the present application. As Figure 4As shown, the battery monitoring system 100 based on automotive battery parameters according to an embodiment of the present application includes: an actual surface temperature measurement module 110, configured to receive a parameter monitoring instruction of an automotive battery, determine an undormant automotive battery according to the parameter monitoring instruction. Among them, the power supply circuit where the undormant automotive battery is located is composed of a first resistor, a second resistor, a third resistor, a power supply, a first capacitor, and a second capacitor. Moreover, the first resistor and the first capacitor are connected in parallel to construct a first parallel circuit, the second resistor and the second capacitor are connected in parallel to construct a second parallel circuit, the first parallel circuit, the second parallel circuit, and the third resistor are connected in series to the undormant automotive battery, start the temperature measurement unit of the undormant automotive battery, and use the temperature measurement unit to measure the actual surface temperature of the undormant automotive battery at the current moment; a current and voltage measurement module 120, configured to judge the magnitude relationship between the actual surface temperature and a preset surface temperature threshold. If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, test the undormant current and undormant voltage of the undormant automotive battery at the current moment; a dynamic characteristic equation construction module 130, configured to determine the monitoring period of the undormant automotive battery, and construct a dynamic characteristic equation of the undormant automotive battery according to the monitoring period, the undormant current, and the undormant voltage; a temperature difference judgment module 140, configured to solve the theoretical surface temperature of the undormant automotive battery according to the dynamic characteristic equation, construct a surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature, and judge the magnitude relationship between the surface temperature difference gradient value and a preset surface temperature difference gradient threshold; and a battery state adjustment module 150, configured to continue to use the undormant automotive battery to work if the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, then adjust the state of the undormant automotive battery to the dormant state to obtain a dormant automotive battery, and start the backup battery of the dormant automotive battery to replace the dormant automotive battery to work.

[0129] In one example, in the above battery monitoring system 100 based on automotive battery parameters, the determining the undormant automotive battery according to the parameter monitoring instruction includes:

[0130] Connect to the control system of the vehicle according to the parameter monitoring instruction;

[0131] Obtain all automotive batteries that supply electrical energy to the vehicle from the control system to obtain a set of power supply batteries;

[0132] Divide the set of power supply batteries into undormant automotive batteries and dormant automotive batteries according to the power supply state of the power supply battery at the current moment;

[0133] Determine all undormant automotive batteries at the current moment.

[0134] In one example, in the battery monitoring system 100 implemented based on the automotive battery parameters described above, the dynamic characteristic equation is:

[0135]

[0136] where t represents the current moment, t + 1 represents the next moment after the current moment, V1(t + 1) and V2(t + 1) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the next moment after the current moment, V1(t) and V2(t) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the current moment, T represents the sampling period of the non-dormant automotive battery, C1 represents the capacitance value of the first capacitor, C2 represents the capacitance value of the second capacitor, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, R3 represents the resistance value of the third resistor, I e (t) represents the current value of the non-dormant automotive battery at the current moment, V OC (t) represents the open-circuit voltage of the non-dormant automotive battery, V e (k) represents the supply voltage supplied by the power supply circuit to the electric vehicle at the current moment.

[0137] In one example, in the battery monitoring system 100 implemented based on the automotive battery parameters described above, the calculation method of the sampling period is:

[0138]

[0139] where f represents the current frequency of the power supply circuit.

[0140] In one example, solving the theoretical surface temperature of the non-dormant automotive battery according to the dynamic characteristic equation includes:

[0141] Obtaining the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment after the current moment;

[0142] Calculating the ambient temperature change value according to the ambient temperatures of the environment where the power supply circuit is located at the current moment and the next moment after the current moment;

[0143] Transforming the dynamic characteristic equation according to the ambient temperature change value and the principle of energy conservation to obtain the calculation formula for the theoretical surface temperature of the non-dormant automotive battery;

[0144] Solving the theoretical surface temperature calculation formula to obtain the theoretical surface temperature of the non-dormant automotive battery.

[0145] In one example, in the battery monitoring system 100 implemented based on the automotive battery parameters described above, transforming the dynamic characteristic equation according to the ambient temperature change value and the principle of energy conservation to obtain the calculation formula for the theoretical surface temperature of the non-dormant automotive battery includes:

[0146]

[0147] Among them, T s (t + 1) represents the theoretical surface temperature of the non-dormant vehicle battery at the next moment, and T c (t) represents the actual surface temperature of the non-dormant vehicle battery at the current moment, ΔT represents the ambient temperature change value, and C s represents the heat capacity of the non-dormant vehicle battery.

[0148] In one example, in the battery monitoring system 100 implemented based on vehicle battery parameters described above, the surface temperature difference gradient value constructed using the actual surface temperature and the theoretical surface temperature includes:

[0149] Obtain the actual surface temperature and the theoretical surface temperature at each moment after receiving the parameter monitoring instruction. Among them, T s (i) represents the theoretical surface temperature at the i-th moment, and T c (i) represents the actual surface temperature at the i-th moment;

[0150] Construct an error function of the theoretical surface temperature and the actual surface temperature;

[0151] Derive the error function to obtain the surface temperature difference gradient value.

[0152] In one example, in the battery monitoring system 100 implemented based on vehicle battery parameters described above, the construction of the error function of the theoretical surface temperature and the actual surface temperature includes:

[0153] Construct an error function based on the gradient descent algorithm:

[0154]

[0155] Among them, J represents the error function of the theoretical surface temperature and the actual surface temperature, m is the total number of all moments after receiving the parameter monitoring instruction, and θ represents the algorithm parameter of the gradient descent algorithm.

[0156] In one example, in the battery monitoring system 100 implemented based on vehicle battery parameters described above, the adjustment of the state of the non-dormant vehicle battery to the dormant state to obtain a dormant vehicle battery and starting the backup battery of the dormant vehicle battery to replace the dormant vehicle battery to work includes:

[0157] Turn off the power supply circuit where the non-dormant vehicle battery is located;

[0158] After successfully turning off the power supply circuit of the non-dormant vehicle battery, adjust the non-dormant vehicle battery to a dormant vehicle battery and start the cooling unit corresponding to the dormant vehicle battery;

[0159] Continuously reduce the surface temperature of the dormant vehicle battery using a temperature reduction unit until the surface temperature of the dormant vehicle battery is less than the set dormant temperature threshold, and at the same time

[0160] Select all the dormant vehicle batteries from the energy supply battery set;

[0161] Measure the supply voltages of all the dormant vehicle batteries in sequence, and select the dormant vehicle battery with the largest supply voltage as the backup battery to replace the dormant vehicle battery to work.

[0162] Here, those skilled in the art can understand that the specific functions and operations of each unit and module in the battery monitoring system 100 implemented based on vehicle battery parameters have been introduced in detail in the above description of the battery monitoring method implemented based on vehicle battery parameters, and therefore, the repeated description thereof will be omitted. Figures 1 to 4 The basic principles of the present application have been described in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purpose of illustration and easy understanding, rather than limitations, and the above details do not limit the present application to necessarily adopt the above specific details to implement.

[0163] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0164] It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0165]

[0166] ​The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0167] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

Claims

1. A method for battery monitoring based on automotive battery parameters, characterized in that, Including: Receiving a parameter monitoring instruction for an automotive battery, and determining an undormant automotive battery according to the parameter monitoring instruction. Wherein, the power supply circuit where the undormant automotive battery is located is composed of a first resistor, a second resistor, a third resistor, a power supply, a first capacitor, and a second capacitor. And a first parallel circuit is constructed by connecting the first resistor and the first capacitor in parallel, and a second parallel circuit is constructed by connecting the second resistor and the second capacitor in parallel. The first parallel circuit, the second parallel circuit, and the third resistor are connected in series to the undormant automotive battery; Starting the temperature measurement unit of the undormant automotive battery, and using the temperature measurement unit to measure the actual surface temperature of the undormant automotive battery at the current moment; Judging the magnitude relationship between the actual surface temperature and a preset surface temperature threshold; If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, measuring the undormant current and undormant voltage of the undormant automotive battery at the current moment; Determining the monitoring period for the undormant automotive battery, and constructing a dynamic characteristic equation for the undormant automotive battery according to the monitoring period, the undormant current, and the undormant voltage; Solving the theoretical surface temperature of the undormant automotive battery according to the dynamic characteristic equation, and constructing a surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature; Judging the magnitude relationship between the surface temperature difference gradient value and a preset surface temperature difference gradient threshold; If the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold, continue to use the undormant automotive battery; If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, then adjust the state of the undormant automotive battery to the dormant state to obtain a dormant automotive battery, and start the backup battery of the dormant automotive battery to replace the dormant automotive battery to work; The solving the theoretical surface temperature of the undormant automotive battery according to the dynamic characteristic equation includes: Obtaining the ambient temperature of the environment where the power supply circuit is located at the current moment and the next moment of the current moment; Calculating the ambient temperature change value according to the ambient temperature of the environment where the power supply circuit is located at the current moment and the next moment of the current moment; Converting the dynamic characteristic equation according to the ambient temperature change value and the principle of conservation of energy to obtain a calculation formula for the theoretical surface temperature of the undormant automotive battery; Solving the theoretical surface temperature calculation formula to obtain the theoretical surface temperature of the undormant automotive battery; The constructing a surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature includes: Obtain the actual surface temperature and the theoretical surface temperature at each moment after receiving the parameter monitoring instruction, where T s (i) represents the theoretical surface temperature at the i-th moment, T c (i) represents the actual surface temperature at the i-th moment; Constructing an error function between the theoretical surface temperature and the actual surface temperature; Taking the derivative of the error function to obtain the surface temperature difference gradient value.

2. The method for battery monitoring based on automotive battery parameters according to claim 1, characterized in that, The determining the undormant automotive battery according to the parameter monitoring instruction includes: Connecting to the control system of the vehicle according to the parameter monitoring instruction; Obtaining all automotive batteries that supply power to the vehicle from the control system to obtain a power supply battery set; Dividing the power supply battery set into undormant automotive batteries and dormant automotive batteries according to the power supply state of the power supply battery at the current moment; Determining all undormant automotive batteries at the current moment.

3. The method for battery monitoring based on automotive battery parameters according to claim 1, characterized in that, The dynamic characteristic equation is: Among them, \(t\) represents the current moment, \(t + 1\) represents the next moment of the current moment, \(V1(t + 1)\) and \(V2(t + 1)\) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the next moment of the current moment, \(V1(t)\) and \(V2(t)\) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the current moment, \(T\) represents the sampling period of the non-dormant automotive battery, \(C1\) represents the capacitance value of the first capacitor, \(C2\) represents the capacitance value of the second capacitor, \(R1\) represents the resistance value of the first resistor, \(R2\) represents the resistance value of the second resistor, \(R3\) represents the resistance value of the third resistor, \(I\) e (t) represents the current value of the current of the non-dormant automotive battery, \(V\) OC (t) represents the open-circuit voltage of the non-dormant automotive battery, \(V\) e (k) represents the supply voltage supplied by the energy supply circuit to the electric vehicle at the current moment.

4. The method for battery monitoring based on automotive battery parameters according to claim 3, characterized in that, The calculation method of the sampling period is: Wherein, f represents the current frequency of the power supply circuit.

5. The method for battery monitoring based on automotive battery parameters according to claim 1, characterized in that, The dynamic characteristic equation is transformed according to the environmental temperature change value and the principle of energy conservation to obtain the theoretical surface temperature calculation formula of the non-dormant vehicle battery, including: Among them, T s (t + 1) represents the theoretical surface temperature of the non-dormant automotive battery at the next moment, T c (t) represents the actual surface temperature of the non-dormant automotive battery at the current moment, ΔT represents the ambient temperature change value, C s represents the heat capacity of the non-dormant automotive battery, V1(t) and V2(t) respectively represent the voltages of the first parallel circuit and the second parallel circuit at the current moment, T represents the sampling period of the non-dormant automotive battery, R3 represents the resistance value of the third resistor, I e (t) represents the current value of the non-dormant automotive battery at the current moment, V e (k) represents the supply voltage supplied by the energy supply circuit to the electric vehicle at the current moment, and t represents the current moment.

6. The battery monitoring method based on automotive battery parameters according to claim 1, characterized in that, The error function between the theoretical surface temperature and the actual surface temperature is constructed, including: The error function is constructed based on the gradient descent algorithm: Among them, J represents the error function between the theoretical surface temperature and the actual surface temperature, m is the total number of all moments after receiving the parameter monitoring instruction, and θ represents the algorithm parameter of the gradient descent algorithm.

7. The battery monitoring method based on automotive battery parameters according to claim 1, characterized in that, The state of the non-dormant vehicle battery is adjusted to the dormant state to obtain a dormant vehicle battery, and the backup battery of the dormant vehicle battery is started to replace the dormant vehicle battery to work, including: The power supply circuit where the non-dormant vehicle battery is located is turned off; After successfully turning off the power supply circuit of the non-dormant vehicle battery, the non-dormant vehicle battery is adjusted to a dormant vehicle battery, and the cooling unit corresponding to the dormant vehicle battery is started; The surface temperature of the dormant vehicle battery is continuously reduced by using the cooling unit until the surface temperature of the dormant vehicle battery is less than the set dormancy temperature threshold, and at the same time All the dormant vehicle batteries are selected from the power supply battery set; The power supply voltages of all the dormant vehicle batteries are measured in sequence, and the dormant vehicle battery with the largest power supply voltage is selected as the backup battery to replace the dormant vehicle battery to work.

8. A battery monitoring system based on automotive battery parameters, characterized in that, Including: An actual surface temperature measurement module, which is used to receive the parameter monitoring instruction of the vehicle battery, determine the non-dormant vehicle battery according to the parameter monitoring instruction. The power supply circuit where the non-dormant vehicle battery is located consists of a first resistor, a second resistor, a third resistor, a power supply, a first capacitor, and a second capacitor. The first resistor and the first capacitor are connected in parallel to form a first parallel circuit, the second resistor and the second capacitor are connected in parallel to form a second parallel circuit, and the first parallel circuit, the second parallel circuit, and the third resistor are connected in series to the non-dormant vehicle battery. The temperature measurement unit of the non-dormant vehicle battery is started, and the actual surface temperature of the non-dormant vehicle battery at the current moment is measured by using the temperature measurement unit; A current and voltage measurement module, which is used to judge the magnitude relationship between the actual surface temperature and the preset surface temperature threshold. If the actual surface temperature is less than or equal to the surface temperature threshold, based on the power supply circuit, the non-dormant current and non-dormant voltage of the non-dormant vehicle battery at the current moment are measured; A dynamic characteristic equation construction module, which is used to determine the monitoring period of the non-dormant vehicle battery, and construct the dynamic characteristic equation of the non-dormant vehicle battery according to the monitoring period, the non-dormant current, and the non-dormant voltage; A temperature difference judgment module, which is used to solve the theoretical surface temperature of the non-dormant vehicle battery according to the dynamic characteristic equation, construct the surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature, and judge the magnitude relationship between the surface temperature difference gradient value and the preset surface temperature difference gradient threshold; The battery state adjustment module is used to continue using the non-dormant vehicle battery if the surface temperature difference gradient value is less than or equal to the surface temperature difference gradient threshold. If the actual surface temperature is greater than the surface temperature threshold or the surface temperature difference gradient value is greater than the surface temperature difference gradient threshold, the state of the non-dormant vehicle battery is adjusted to the dormant state to obtain a dormant vehicle battery, and the backup battery of the dormant vehicle battery is started to replace the dormant vehicle battery to work; The method for solving the theoretical surface temperature of the non-dormant vehicle battery according to the dynamic characteristic equation includes: Obtaining the ambient temperature of the environment where the power supply circuit is located at the current moment and the next moment of the current moment; Calculating the ambient temperature change value according to the ambient temperature of the environment where the power supply circuit is located at the current moment and the next moment of the current moment; Transforming the dynamic characteristic equation according to the ambient temperature change value and the principle of energy conservation to obtain a calculation formula for the theoretical surface temperature of the non-dormant vehicle battery; Solving the theoretical surface temperature calculation formula to obtain the theoretical surface temperature of the non-dormant vehicle battery; The method for constructing the surface temperature difference gradient value by using the actual surface temperature and the theoretical surface temperature includes: Obtain the actual surface temperature and the theoretical surface temperature at each moment after receiving the parameter monitoring instruction, where T s (i) represents the theoretical surface temperature at the i-th moment, T c (i) represents the actual surface temperature at the i-th moment; Constructing an error function between the theoretical surface temperature and the actual surface temperature; Deriving the error function to obtain the surface temperature difference gradient value.

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