TWI851173B - Vehicle power management system - Google Patents

Abstract

A vehicle power management system includes a power control assembly and a battery management device. The power control assembly is coupled with two-battery packs to select power supply from either a first battery or a second battery. The battery management device is coupled with the two-battery packs and the power control assembly, which includes a controlling module, a detecting module, a processing module, and an output module. When a generator is in an active state, the controlling module controls the power control assembly to select power supply from the first battery. When the generator is in an off state, the control module controls the power control assembly to select power supply from the second battery. The detecting module detecting a first voltage of the first battery. The processing module estimating a battery health status of the according to a battery detecting model and the first voltage, and selectively output a battery life information according to the battery health status. The output module outputting the battery life information.

Description

On-board power management system

A vehicle power management system is applied in the field of automotive power systems, especially a system for controlling the power supply of dual battery packs used in vehicles.

The power supply modes of a car battery can be roughly divided into flameout mode, ACC mode, and full-vehicle power supply mode. Among them, when the car battery is in flameout mode, the car battery and the car's electronic equipment and the engine ignition device are in a circuit-breaking state and no power is supplied. When the car battery is in ACC mode, the car battery and the car's electronic equipment are in a circuit-conducting state, and the engine ignition device is in a circuit-breaking state, and only some of the car's electronic equipment (such as audio equipment, lighting equipment or car host) is powered. In the full-vehicle power supply mode, the car battery and the engine ignition device and the accessory auxiliary power supply mode are in a circuit-conducting state and power is supplied. However, when the car battery is in ACC mode, the car battery is connected to too many car electronic devices, which will accelerate the consumption of the car battery's power, and eventually cause the car battery to not have enough power to drive the engine ignition device, which will have a negative impact on the car battery in the long run.

In view of this, in some embodiments, a vehicle-mounted power management system is provided, which is applicable to a vehicle having a dual battery pack, a generator and a vehicle-mounted expansion device, wherein the dual battery pack includes a first battery and a second battery. The vehicle-mounted power management system includes a power control component and a battery management device. The power control component is coupled to the dual battery pack to select power supply from the first battery or the second battery. The battery management device is coupled to the dual battery pack and the power control component. The battery management device includes a control module, a detection module and a processing module. When the vehicle generator is in an activated state, the control module controls the power control component to select the first battery to supply power to the vehicle expansion device, and when the vehicle generator is in an off state, the control module controls the power control component to select the second battery to supply power to the vehicle expansion device. The detection module detects the first voltage of the first battery. The processing module is coupled to the detection module, and estimates the battery health status of the first battery according to the battery detection model and the first voltage, and selectively generates battery durability information according to the battery health status. The output module is coupled to the processing module, and displays the battery durability information.

In some embodiments, the first voltage of the first battery in the charging state forms a charging time-varying signal, and the processing module determines that the battery health state of the first battery is an abnormal charging state when the charging slope of the charging time-varying signal is less than the charging slope threshold, wherein the charging slope threshold is estimated by the processing module based on at least one charging state parameter obtained by the first voltage and input into the battery detection model.

In some embodiments, the first voltage of the first battery in the discharge state forms a discharge time-varying signal, and the processing module determines that the battery health state of the first battery is an abnormal discharge state when the discharge slope of the discharge time-varying signal is greater than the discharge slope threshold, wherein the discharge slope threshold is estimated by the processing module based on at least one discharge state parameter obtained by the first voltage and input into the battery detection model.

In some embodiments, when the first voltage of the first battery is continuously less than the battery status judgment threshold during the charging period, the processing module judges that the battery health status of the first battery is a battery aging state, wherein the battery status judgment threshold is estimated by the processing module based on at least one battery status parameter obtained by the first voltage and input into a battery detection model.

In some embodiments, the battery management device further includes an analog-to-digital converter, which is coupled to the first battery, the second battery, and the processing module to identify the values of the first voltage and the second voltage.

In some embodiments, after a delay period when the control module responds to the power-off signal, the power control component is controlled to select the second battery for power supply.

In some embodiments, when the first voltage of the control module is equal to the power-off cut-off voltage and reaches the detection number, the control module controls the power control component to select the second battery for power supply after a delay time.

In some embodiments, when the control module receives a power-off signal and the first voltage is equal to the power-off cut-off voltage, the power control component controls the first battery to not supply power and the second battery to supply power.

In some embodiments, when the second voltage is less than or equal to the charging lower limit, the control module generates a charging start signal, and the power control component charges the second battery according to the charging start signal; during the charging of the second battery, when the second voltage is greater than or equal to the charging upper limit, the control module generates a charging end signal, and the power control component stops charging the second battery according to the charging end signal.

In some embodiments, when the second voltage is less than or equal to the battery protection threshold, the control module generates a discharge end signal, and the power control component stops the second battery from continuing to discharge according to the discharge end signal.

In some embodiments, the processing module intermittently obtains the first voltage through the detection module. When the obtained first voltage continuously reaches the upper limit threshold and the number of times is equal to the voltage detection threshold, the control module generates a charging end signal; when the obtained first voltage continuously reaches the charging lower limit and the number of times is equal to the lower limit threshold, the control module generates a charging start signal again.

In some embodiments, when the second voltage reaches the vehicle ignition-off voltage, the control module generates an auxiliary power cut-off signal, and the power control component stops the second battery from supplying power according to the auxiliary power cut-off signal.

In some embodiments, the detection module includes a temperature measuring unit, which is used to detect the battery temperature. When the battery temperature reaches the power-off temperature, the control module generates a power trip signal, and the power control component stops supplying power to the first battery or the second battery that has reached the power-off temperature according to the power trip signal.

In some embodiments, the battery management device further includes a storage module, the storage module is coupled to the control module and the processing module, and the control module stores the first voltage and the second voltage detected by the detection module in the storage module.

In some embodiments, a rescue switch is further included, and the rescue switch connects the first battery and the second battery. When the rescue switch is activated, the first battery and the second battery are connected in parallel, so that the first voltage is consistent with the second voltage.

In some embodiments, a vehicle-mounted power management system is also provided, which is applicable to a vehicle having a dual battery pack, a generator and a vehicle-mounted expansion device, wherein the dual battery pack includes a first battery and a second battery. The vehicle-mounted power management system includes a power control component and a battery management device. The power control component is coupled to the dual battery pack to select power supply from the first battery or the second battery. The battery management device is coupled to the dual battery pack and the power control component. The battery management device includes a control module, a detection module and a processing module. When the generator of the vehicle is in an operating state, the control module controls the power control component to select power supply from the second battery to the vehicle-mounted expansion device, and when the generator of the vehicle is in a shut-down state, the control module controls the power control component to select power supply from the first battery to the vehicle-mounted expansion device. The detection module detects the second voltage of the second battery. The processing module is coupled to the detection module, and estimates the battery health status of the second battery according to the battery detection model and the second voltage, and selectively generates battery durability information according to the battery health status. The output module is coupled to the processing module, and displays the battery durability information.

In summary, according to some embodiments, the vehicle power management system includes a battery management device and a power control component. The battery management device includes a control module, a processing module and a detection module. The detection module can detect a first voltage of a first battery and a second voltage of a second battery. The processing module can train a battery detection model according to the voltage data of the first voltage and the second voltage, and the processing module can input the first voltage and the second voltage into the battery detection model through the trained battery detection model to predict the battery health status. The processing module can selectively output battery life information according to the battery health status. In this way, the user can grasp the current status of the dual battery pack in real time. In addition, the control module can select the first battery or the second battery to supply power through the power control component according to whether the generator is in operation. This allows the first battery and the second battery to be maintained in a normal use state, avoiding overcharging, discharging, and low power of the first battery and the second battery.

10: On-board power management system

101: Dual battery pack

102: First Battery

104: Second battery

106: Battery management device

108: Power control component

110: Control module

112: Processing module

114: Detection module

115: Output module

116:Analog-to-digital converter

117: Potentiometer

118: Temperature measurement unit

120: Storage module

122: Rescue switch

30: On-board device

40: Generator

50: Car expansion device

FIG1 is a block diagram of a vehicle power management system in some embodiments of the present invention.

FIG2 is a block diagram of the vehicle power management system in other embodiments of the present invention, showing that when the rescue switch is activated, the first battery and the second battery form an electrical loop.

Various embodiments are presented below for detailed description. However, the embodiments are only used as examples and do not limit the scope of protection of the present invention. In addition, some components are omitted in the drawings in the embodiments to clearly show the technical features of the present invention. The same reference numerals will be used to represent the same or similar components in all drawings.

Please refer to FIG1. FIG1 is a block diagram of a vehicle-mounted power management system in some embodiments of the present invention. As shown in FIG1, the vehicle-mounted power management system 10 is applicable to a vehicle having a dual battery pack 101 to perform intelligent management, abnormality sensing, charge and discharge management, automatic power off and other measures on the dual battery pack 101. The dual battery pack 101 includes a first battery 102 and a second battery 104. The first battery 102 is a battery (or battery) built into the vehicle, so the power supply and charging mechanism of the first battery 102 will not be elaborated. The second battery 104 is a battery (or battery) additionally installed in the vehicle, and its charge and discharge management measures will be specifically described later. Here, the vehicle refers to a vehicle such as a motorcycle or a car that travels on the road with a prime mover without relying on tracks or power lines. In addition to the vehicle power management system 10 and the dual battery pack 101, the vehicle also has a vehicle device 30 and a vehicle expansion device 50. The vehicle device 30 is an electrical device that is equipped when the vehicle leaves the factory, such as a driving computer, a car stereo, a headlight or a reversing radar, etc. The vehicle expansion device 50 is an additional electronic device installed after the vehicle leaves the factory, such as a vehicle security device, a navigation machine or a driving recorder, etc.

The vehicle power management system 10 includes a battery management device 106 and a power control component 108. The power control component 108 is coupled to the dual battery pack 101, and selects the first battery 102 as the power source of the vehicle expansion device 50 by connecting the power supply path between the first battery 102 and the vehicle expansion device 50, and cuts off the power supply of the second battery 104 by cutting off the power supply path between the second battery 104 and the vehicle expansion device 50; 4 and the vehicle expansion device 50 to select the second battery 104 as the power source of the vehicle expansion device 50, and cut off the power supply of the first battery 102 by cutting off the power supply path between the first battery 102 and the vehicle expansion device 50, so that one of the first battery 102 and the second battery 104 can be selected to supply power to the vehicle expansion device 50. In some embodiments, the power control component 108 can perform switch control by a circuit combination of a delay trigger circuit, a voltage detection chip, and a switch circuit (such as a MOSFET switch circuit).

The battery management device 106 is coupled to the dual battery pack 101 and the power control component 108. The battery management device 106 includes a control module 110, a processing module 112, a detection module 114 and an output module 115. The control module 110 is coupled to the power control component 108 to switch the power supply source of the vehicle expansion device 50 to the first battery 102 or the second battery 104 through the power control component 108. When the generator 40 of the vehicle is in an active state (i.e., the generator 40 is activated when the vehicle is started), the control module 110 controls the power control component 108 to select the first battery 102 to supply power to the vehicle expansion device 50. When the vehicle generator 40 is in an off state (i.e., the vehicle is turned off and the generator 40 is not in operation), the control module 110 controls the power control component 108 to select the second battery 104 to supply power to the vehicle expansion device 50. This can avoid the problem of continuous power supply from the first battery 102, which causes continuous consumption of the first battery 102, and can extend the service life of the first battery 102. Specifically, there is a switch (not shown) between the first battery 102 and the vehicle expansion device 50. When the vehicle is in the off state, the switch can disconnect the first battery 102 from the vehicle expansion device 50. When the vehicle is in the start-up state, the switch connects the first battery 102 to the vehicle expansion device 50. The switch can be controlled by a switch system (not shown) of the vehicle. Therefore, the first battery 102 selectively supplies power to the vehicle expansion device 50.

The control module 110 may be, for example, a central processing unit (CPU), a graphics processing unit (GPU), a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). The aforementioned "when the generator 40 is in an operating state, the power control component 108 is controlled to select the first battery 102 to supply power to the vehicle expansion device 50" may mean that when the generator 40 is in an operating state, the control module 110 sends a first power-on signal, so that the power control component 108 responds to the first power-on signal and selects the first battery 102 to supply power. It may also mean that when the generator 40 is in the activated state, the generator 40 sends a first power-on signal, so that the control module 110 responds to the first power-on signal and controls the power control component 108 to select the first battery 102 for power supply. The aforementioned "when the generator 40 is in the off state, the power control component 108 is controlled to select the second battery 104 to supply power to the vehicle expansion device 50" may mean that when the generator 40 is in the off state, the control module 110 sends a second power-on signal, so that the power control component 108 responds to the second power-on signal and selects the second battery 104 for power supply.

The detection module 114 detects the output voltage (hereinafter referred to as the first voltage) of the first battery 102. The processing module 112 is coupled to the detection module 114 to estimate the battery health status of the first battery 102 according to a battery detection model and the first voltage, and to generate a battery life information according to the battery health status. The output module 115 is coupled to the processing module 112 and outputs the battery life information. Thus, the user can know the battery health status of the first battery 102 through the battery life information output by the output module 115.

In some embodiments, the detection module 114 can also detect the output voltage of the second battery 104 (hereinafter referred to as the second voltage). The processing module 112 can also estimate the battery health status of the second battery 104 based on the second voltage in conjunction with the aforementioned battery detection model or another battery detection model, and generate battery durability information based on the battery health status, and the output module 115 outputs the battery durability information of the second battery 104. In this way, the user can know the battery health status of the second battery 104 through the battery durability information output by the output module 115.

In some embodiments, the output module 115 can be a display device such as a liquid crystal screen, a voice device, or a wireless communication module such as a mobile communication module, SUB-1G, WIFI, ZigBee, Bluetooth, etc. When the output module 115 is a display device, the battery life information can be displayed. When the output module 115 is a mobile communication module, the battery life information can be transmitted to the user's mobile device through methods such as text messages and network push. When the output module 115 is a wireless communication module such as SUB-1G, WIFI, ZigBee, Bluetooth, etc., the battery life information can be transmitted to the vehicle computer on the vehicle through wireless communication, and then transmitted to the user's mobile device by the vehicle computer (with mobile communication function).

In some embodiments, the battery life information may include abnormal notification information indicating that the first battery 102 or the second battery 104 is in an abnormal charging state, an abnormal discharging state, or a battery aging state (described later), and may also include usage information of the first battery 102 or the second battery 104 (such as output voltage value, number of times used, etc.).

The vehicle's power supply is generally provided by the first battery 102, so that the vehicle power management system 10, the vehicle device 30 and the vehicle expansion device 50 can be powered. The first battery 102 can also start the generator 40 via a power switch (not shown). After the generator 40 is started, it can charge the first battery 102 and the second battery 104. The voltage of the first battery 102 when unloaded can be 12 volts or 24 volts.

The present invention adopts a dual power output mechanism. When the generator 40 is not in operation, the power supply path of the first battery 102 to the vehicle expansion device 50 is cut off, and the second battery 104 is responsible for supplying power to the vehicle expansion device 50. In this way, the consumption of the first battery 102 can be dispersed through the second battery 104, extending the service life of the first battery 102. The voltage of the second battery 104 when unloaded can be 12 volts or 24 volts, wherein the rated voltage of the first battery 102 and the second battery 104 are the same.

The processing module 112 may be, for example, a central processing unit (CPU), a graphics processing unit (GPU), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a tensor processing unit (TPU), or a neural network processor (NPU). The processing module 112 may load a battery detection model for execution to determine the battery health status of the main power supply source (the first battery 102 or the second battery 104) according to the first voltage or the second voltage through the battery detection model.

The battery detection model can be obtained by training a supervised machine learning model or an unsupervised machine learning model. For example, the supervised machine learning model can be a linear regression model, a decision tree model, a decision tree model, or a K-Nearest Neighbors Model. The unsupervised machine learning model can be a K-Means Clustering Model, a Gaussian Mixture Model, a Singular Value Decomposition Model, or a Principal Component Analysis Model. It should be noted that the training data of the battery detection model is the voltage data of the first battery 102 or the second battery 104 when it is unloaded, charged or discharged. Specifically, the voltage data may at least include a charging voltage (first voltage) and a charging time of the first battery 102 and/or the second battery 104 in a charging state, and a discharge voltage and a discharge time in a discharge state. And after the voltage data is input into the battery detection model and trained, the battery detection model can predict the battery health status of the first battery 102 or the second battery 104 by analyzing the first voltage and/or the second voltage.

The detection module 114 is coupled to the first battery 102 and the second battery 104. Specifically, the detection module 114 includes two potentiometers 117. The two potentiometers 117 of the detection module 114 detect the first voltage and the second voltage of the first battery 102 and the second battery 104 respectively. In addition, the detection module 114 can transmit the values of the first voltage and the second voltage to the processing module 112 in real time.

In some embodiments, the detection module 114 of the battery management device 106 further includes an analog-to-digital converter 116. The analog-to-digital converter 116 is coupled to the two potentiometers 117 and the processing module 112 to identify the first voltage and the second voltage. The analog-to-digital converter 116 may be, for example, a 16-bit analog-to-digital converter, so that the analog-to-digital converter 116 can perform a precise comparison of the digital voltage values.

The following describes the monitoring of abnormal charging and discharging and battery aging of the first battery 102 and/or the second battery 104.

In some embodiments, the first voltage of the first battery 102 in the charging state forms a charging time-varying signal, and the processing module 112 determines that the battery health state of the first battery 102 is an abnormal charging state when a charging slope of the charging time-varying signal is less than a charging slope threshold. The charging slope threshold is estimated by the processing module 112 based on at least one charging state parameter obtained by the first voltage and input into the battery detection model. Specifically, the charging state parameter can be the data of the first battery 102 measured by the generator 40 when the first battery 102 is in a normal charging state. The charging state parameter can be, for example, one of a charging slope variation, a voltage change magnitude, and a charging time constant, or a combination of two or more of the aforementioned parameters. The charging time-varying signal may refer to the timing variation of the first voltage measured by the first battery 102 during the most recent charging period. Since the first battery 102 is being charged, the first voltage is increasing (with a positive slope). If the slope of the first voltage becomes flat, it indicates that the first battery 102 stops charging. In addition, if the charging slope of the charging time-varying signal is less than the charging slope threshold, it indicates that the first battery 102 is abnormally charged at this moment.

In some embodiments, the second voltage of the second battery 104 in the charging state forms a charging time-varying signal, and the processing module 112 determines that the battery health state of the second battery 104 is an abnormal charging state when the charging slope of the charging time-varying signal is less than the charging slope threshold. The charging slope threshold is estimated by the processing module 112 based on at least one charging state parameter obtained by the second voltage and input into the battery detection model. The relevant estimation method and data acquisition of the second battery 104 are similar to those of the first battery 102 mentioned above, and will not be repeated here.

In some embodiments, the first voltage of the first battery 102 in the discharge state forms a discharge time-varying signal, and the processing module 112 determines that the battery health state of the first battery 102 is an abnormal discharge state when a discharge slope of the discharge time-varying signal is less than a discharge slope threshold. The discharge slope threshold is estimated by the processing module 112 based on at least one discharge state parameter obtained by the first voltage and input into the battery detection model. Specifically, the discharge state parameter can be the data measured by the first battery 102 for the vehicle expansion device 50 in the normal discharge state. The discharge state parameter can be, for example, one of a discharge slope variation, a change in voltage magnitude, and a discharge time constant, or a combination of two or more of the aforementioned parameters. The discharge time-varying signal may refer to the time sequence variation of the first voltage measured by the first battery 102 during the most recent discharge time. Since the first battery 102 is being discharged, the first voltage varies decrementally (with a negative slope). In addition, if the discharge slope of the discharge time-varying signal is less than the discharge slope threshold, it indicates that the discharge of the first battery 102 is abnormal at this moment.

In some embodiments, the second voltage of the second battery 104 in the discharge state forms a discharge time-varying signal, and the processing module 112 determines that the battery health state of the second battery 104 is an abnormal discharge state when the discharge slope of the discharge time-varying signal is less than a discharge slope threshold. The discharge slope threshold is estimated by the processing module 112 based on at least one discharge state parameter obtained by the second voltage and input into the battery detection model. The relevant estimation method and data acquisition of the second battery 104 are similar to those of the first battery 102, and will not be repeated here.

In some embodiments, the processing module 112 determines that the battery health state of the first battery 102 is a battery aging state in response to the first voltage of the first battery 102 being continuously less than a battery state determination threshold during a charging period; wherein the battery state determination threshold is estimated by the processing module 112 by inputting at least one battery state parameter obtained according to the first voltage into a battery detection model. Similarly, the processing module 112 can also judge that the battery health state of the second battery 104 is a battery aging state in response to the second voltage of the second battery 104 being continuously less than a battery status judgment threshold during a charging period; here, the battery status judgment threshold is estimated by the processing module 112 based on at least one battery status parameter obtained from the second voltage and input into the battery detection model. It should be noted that the first battery 102 and the second battery 104 are preset to have the same voltage when unloaded, so in some embodiments, the battery status judgment threshold of the second battery 104 can be set to be the same as that of the first battery 102. In addition, the battery detection model can generate different battery status judgment thresholds according to the specifications (12 volts or 24 volts) of the first battery 102 or the second battery 104. For example, if the first battery 102 is 12 volts, the battery status judgment threshold may be between 12 volts and 13 volts. If the first battery 102 is 24 volts, the battery status judgment threshold may be between 22 volts and 23 volts. The charging period can be expressed in days or hours, such as 15 days or 360 hours.

The aforementioned "the first voltage of the first battery 102 is continuously less than the battery status judgment threshold during the charging period" means that during the period when the generator 40 charges the first battery 102, the first voltage detected by the detection module 114 is continuously less than the battery status judgment threshold. The aforementioned "the second voltage of the second battery 104 is continuously less than the battery status judgment threshold during the charging period" means that during the period when the generator 40 charges the second battery 104, the second voltage detected by the detection module 114 is continuously less than the battery status judgment threshold.

Next, it is described how the control module 110 determines whether the generator 40 is in an active state or an off state. In some embodiments, when the generator 40 is in an off state, the generator 40 will send a power-off signal, and the control module 110 can identify that the generator 40 is in an off state according to the power-off signal. In order to ensure that the generator 40 is indeed in an off state, the control module 110 responds to receiving the power-off signal after a delay time (such as 50 seconds to 60 seconds), and then controls the power control component 108 to control the first battery 102 to not supply power and the second battery 104 to supply power.

In some embodiments, after the second battery 104 is used to supply power to the vehicle expansion device 50 for a period of time, the control module 110 can stop the second battery 104 from supplying power to the vehicle expansion device 50. At this time, the vehicle expansion device 50 does not receive power from the first battery 102 and the second battery 104, thereby preventing the first battery 102 and the second battery 104 from being completely exhausted.

In some embodiments, the control module 110 determines whether the generator 40 is in an active state or an off state by the voltage of the first battery 102 or the second battery 104. When the first voltage or the second voltage is equal to a power-off cut-off voltage and reaches a detection number, the control module 110 recognizes that the generator 40 is in an off state. In order to ensure that the generator 40 is indeed in an off state, the control module 110 controls the power control component 108 to select the first battery 102 or the second battery 104 for power supply after a delay time (1 second to 10 seconds). The detection number can be two to five times, preferably three times, to repeatedly confirm whether the generator 40 is in an off state. In some embodiments, if the voltage of the dual battery pack 101 when it is unloaded is 12 volts, the power-off cut-off voltage can be 9 volts. If the voltage of the dual battery pack 101 when it is unloaded is 24 volts, the power-off cut-off voltage can be 18 volts.

In some embodiments, when the control module 110 receives a power-off signal and the first voltage or the second voltage is equal to the power-off cut-off voltage, it is confirmed that the generator 40 is in the off state, and the power control component 108 is controlled to select the first battery 102 or the second battery 104 for power supply.

Next, the control module 110 controls the charging and discharging of the second battery 104. In some embodiments, the control module 110 generates a charging start signal when the second voltage is less than or equal to a charging lower limit, and the power control component 108 charges the second battery 104 according to the charging start signal. Specifically, the control module 110 can charge the second battery 104 with the generator 40 when the second battery 104 is insufficient, so that the second battery 104 can be kept in a state of sufficient power. Therefore, when the second voltage is equal to the charging lower limit, the generator 40 can charge the second battery 104. In this way, the second battery 104 can be prevented from being damaged by the low power. On the contrary, during the charging of the second battery 104, when the second voltage is greater than or equal to a charging upper limit, the control module 110 generates a charging end signal, and the power control component 108 stops the generator 40 from continuing to charge the second battery 104 according to the charging end signal. In this way, the second battery 104 can be prevented from being overcharged. If the voltage of the dual battery pack 101 is 14 volts when it is not loaded, the charging upper limit can be 14.2 volts and the charging lower limit can be 12.6 volts. In some embodiments, if the voltage of the dual battery pack 101 is 24 volts when it is not loaded, the charging upper limit can be 28.4 volts and the charging lower limit can be 25.2 volts.

In some embodiments, when the second voltage is less than or equal to a battery protection threshold, the control module 110 generates a discharge end signal, and the power control component 108 stops the second battery 104 from continuing to discharge according to the discharge end signal. In some embodiments, if the voltage of the second battery 104 is 14 volts when it is not loaded, the battery protection threshold can be 10.6 volts. If the voltage of the second battery 104 is 24 volts when it is not loaded, the battery protection threshold can be 21 volts.

In some embodiments, the processing module 112 intermittently obtains the second voltage through the detection module 114. When the obtained second voltage continuously reaches an upper limit threshold and the number of times is equal to a voltage detection threshold, the control module 110 generates a charging end signal; when the obtained second voltage continuously reaches a lower limit value and the number of times is equal to a lower limit threshold, the control module 110 generates a charging start signal again. In this way, the control module 110 can repeatedly perform charging and discharging controls to keep the second battery 104 at a suitable power level.

In some embodiments, when the second voltage reaches a vehicle ignition-off voltage, the control module 110 generates an auxiliary power cut-off signal, and the power control component 108 stops the second battery 104 from supplying power according to the auxiliary power cut-off signal. In this way, the control module 110 can prevent the second battery 104, which is an auxiliary power source, from being too low in power and causing battery degradation. In some embodiments, the vehicle ignition-off voltage can be 9 volts.

In some embodiments, the detection module 114 includes a temperature measuring unit 118, which is used to detect a battery temperature of the first battery 102 or/and the second battery 104. When the battery temperature reaches a power-off temperature, the control module 110 generates a power trip signal, and the power control component 108 stops supplying power to the first battery 102 or the second battery 104 that has reached the power-off temperature according to the power trip signal. In this way, the control module 110 can detect the temperature of the first battery 102 or the second battery 104, and when the temperature is abnormal (the battery temperature reaches the power-off temperature), the first battery 102 or the second battery 104 can be prevented from battery degradation due to temperature rise.

In some embodiments, the battery management device 106 further includes a storage module 120, the storage module 120 is coupled to the control module 110 and the processing module 112, and the control module 110 stores the first voltage and the second voltage detected by the detection module 114 in the storage module 120. The processing module 112 can access the recorded data of the first voltage and the second voltage of the storage module 120. The storage module 120 can be, for example, a non-transient computer-readable recording medium.

Please refer to FIG. 2, which is a block diagram of the vehicle power management system in other embodiments of the present invention, showing that when the rescue switch 122 is activated, the first battery 102 and the second battery 104 form an electrical loop. FIG. 2 does not show other components of the battery management device 106 (please refer to FIG. 1), the detection module 114, the analog-to-digital converter 116, the storage module 120 and the generator 40. In some embodiments, the vehicle power management system 10 shown in FIG. 2 further includes a rescue switch 122, which connects the first battery 102 and the second battery 104. When the rescue switch 122 is activated, the first battery 102 and the second battery 104 are connected in parallel, so that the first voltage is consistent with the second voltage. When the vehicle is powered on, if the generator 40 cannot be started smoothly due to insufficient power in the first battery 102 as the main power source, the voltage of the insufficient main power source and the voltage of the auxiliary power source can be made consistent by activating the rescue switch 122. This allows the first battery 102 to have sufficient voltage to allow the generator 40 to start smoothly. In some embodiments, the activation time of the rescue switch 122 does not exceed 5 seconds to avoid the risk of current reverse injection. The rescue switch 122 can be activated manually or by a trigger signal. The trigger signal can be sent to the battery management device 106 by the user operating a remote control or a mobile phone application (such as using the output module 115 of the aforementioned communication module, or additionally setting up a communication circuit corresponding to the communication technology to receive the trigger signal).

In summary, according to some embodiments of the vehicle power management system 10, the vehicle expansion device 50 can be powered by the first battery 102 or the second battery 104 according to the status of the generator 40, and the battery health status can be estimated to output battery durability information, so that the user can instantly grasp the current status of the dual battery pack 101. In addition, the power control component 108 can also perform charge and discharge control and power-off protection on the second battery 104, and can perform temperature detection on the dual battery pack 101 to automatically trip the power supply when the temperature is abnormal. In addition, the vehicle power management system 10 can also include a rescue switch 122. Activating the rescue switch 122 can make the second battery 104 serve as an emergency rescue battery for the first battery 102.

The above-mentioned embodiments are only for illustrating the technical ideas and features of this case. Their purpose is to enable those familiar with this technology to understand the content of this case and implement it accordingly. They cannot be used to limit the patent scope of this case. In other words, any equivalent changes or modifications made according to the spirit disclosed in this case should still be covered by the scope of the patent application of this case.

10: On-board power management system

101: Dual battery pack

102: First Battery

104: Second battery

106: Battery management device

108: Power control component

110: Control module

112: Processing module

114: Detection module

115: Output module

116: Voltage comparator

117: Potentiometer

118: Temperature measurement unit

120: Storage module

30: On-board device

40: Generator

50: Car expansion device

Claims (15)

A vehicle-mounted power management system is applicable to a vehicle having a dual battery pack, a generator and a vehicle-mounted expansion device, wherein the dual battery pack includes a first battery and a second battery. The vehicle-mounted power management system comprises: a power control component coupled to the dual battery pack to select the first battery or the second battery to supply power; and a battery management device coupled to the dual battery pack and the power control component, comprising: a control module, when the generator of the vehicle is in an active state, controlling the power control component to select the first battery to supply power to the vehicle-mounted expansion device, and when the generator of the vehicle is in a closed state, controlling the power control component to select the second battery to supply power to the vehicle-mounted expansion device; a detection module, detecting A first voltage of the first battery; a processing module coupled to the detection module, estimating a battery health state of the first battery according to a battery detection model and the first voltage, and generating battery durability information according to the battery health state; and an output module coupled to the processing module, and outputting the battery durability information; wherein the first voltage of the first battery in a charging state forms a charging time-varying signal, and the processing module determines that the battery health state of the first battery is an abnormal charging state when a charging slope of the charging time-varying signal is less than a charging slope threshold, wherein the charging slope threshold is estimated by the processing module according to at least one charging state parameter obtained by the first voltage and input into the battery detection model. The vehicle-mounted power management system as described in claim 1, wherein the first voltage of the first battery in a discharge state forms a discharge time-varying signal, and the processing module determines that the battery health state of the first battery is an abnormal discharge state when a discharge slope of the discharge time-varying signal is greater than a discharge slope threshold, wherein the discharge slope threshold is estimated by the processing module based on at least one discharge state parameter obtained from the first voltage and input into the battery detection model. The vehicle-mounted power management system as described in claim 2, wherein the processing module judges that the battery health state of the first battery is a battery aging state in response to the first voltage of the first battery being continuously less than a battery state judgment threshold during a charging period, wherein the battery state judgment threshold is estimated by the processing module based on at least one battery state parameter obtained from the first voltage and input into the battery detection model. The vehicle-mounted power management system as described in claim 1, wherein the battery management device further includes an analog-to-digital converter, the analog-to-digital converter is coupled to the first battery, the second battery and the processing module to identify the values of the first voltage and the second voltage. The vehicle-mounted power management system as described in claim 1, wherein the control module controls the power control component to select the second battery to supply power after a delay time in response to an electrical signal. The vehicle-mounted power management system as described in claim 1, wherein when the first voltage is equal to a power-off cut-off voltage and reaches a detection number, the control module controls the power control component to select the second battery for power supply after a delay time. As described in claim 1, the vehicle-mounted power management system, wherein when the control module receives a power-off signal and the first voltage is equal to a power-off cut-off voltage, the power control component controls the first battery to stop supplying power and the second battery to supply power. The vehicle-mounted power management system as described in claim 1, wherein when a second voltage is less than or equal to a charging lower limit, the control module generates a charging start signal, and the power control component charges the second battery according to the charging start signal; during the charging of the second battery, when the second voltage is greater than or equal to a charging upper limit, the control module generates a charging end signal, and the power control component stops charging the second battery according to the charging end signal. As described in claim 8, the vehicle-mounted power management system, wherein when the second voltage is less than or equal to a battery protection threshold, the control module generates a discharge end signal, and the power control component stops the second battery from continuing to discharge according to the discharge end signal. The vehicle-mounted power management system as described in claim 8, wherein the processing module intermittently obtains the first voltage through the detection module, and when the obtained first voltage continuously reaches an upper limit number of times threshold and the number of times is equal to a voltage detection threshold, the control module generates the charging end signal; when the obtained first voltage continuously reaches the charging lower limit value and the number of times is equal to the lower limit number of times threshold, the control module generates the charging start signal again. The vehicle power management system as described in claim 1, wherein when the second voltage reaches a vehicle ignition-off voltage, the control module generates an auxiliary power cut-off signal, and the power control component stops the second battery from supplying power according to the auxiliary power cut-off signal. The vehicle-mounted power management system as described in claim 1, wherein the detection module includes a temperature measuring unit, the temperature measuring unit is used to detect a battery temperature, when the battery temperature reaches a power-off temperature, the control module generates a power trip signal, and the power control component stops the first battery or the second battery that reaches the power-off temperature from supplying power according to the power trip signal. As described in claim 1, the battery management device further includes a storage module, the storage module is coupled to the control module and the processing module, and the control module stores the first voltage and the second voltage detected by the detection module in the storage module. The vehicle-mounted power management system as described in claim 1 further includes a rescue switch, which connects the first battery and the second battery. When the rescue switch is activated, the first battery and the second battery are connected in parallel, so that the first voltage is consistent with a second voltage. A vehicle-mounted power management system is applicable to a vehicle having a dual battery pack, a generator and a vehicle-mounted expansion device, wherein the dual battery pack includes a first battery and a second battery. The vehicle-mounted power management system comprises: a power control component coupled to the dual battery pack to select the first battery or the second battery to supply power; and a battery management device coupled to the dual battery pack and the power control component, comprising: a control module, when the generator of the vehicle is in an active state, controlling the power control component to select the second battery to supply power to the vehicle-mounted expansion device, and when the generator of the vehicle is in a closed state, controlling the power control component to select the first battery to supply power to the vehicle-mounted expansion device; a detection module, detecting the A second voltage of a second battery; a processing module coupled to the detection module, estimating a battery health state of the second battery according to a battery detection model and the second voltage, and generating battery durability information according to the battery health state; and an output module coupled to the processing module, and outputting the battery durability information; wherein the second voltage of the second battery in a charging state forms a charging time-varying signal, and the processing module determines that the battery health state of the second battery is an abnormal charging state when a charging slope of the charging time-varying signal is less than a charging slope threshold, wherein the charging slope threshold is estimated by the processing module according to at least one charging state parameter obtained by the first voltage and input into the battery detection model.

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