CN120468695A - Battery health determination method, device and control system - Google Patents
Battery health determination method, device and control systemInfo
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- CN120468695A CN120468695A CN202411751567.2A CN202411751567A CN120468695A CN 120468695 A CN120468695 A CN 120468695A CN 202411751567 A CN202411751567 A CN 202411751567A CN 120468695 A CN120468695 A CN 120468695A
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Abstract
本申请实施例提供一种电池健康度确定方法、装置及控制系统，方法包括：获取目标电池从充电启动状态到充电截止状态的补电容量，以及从充电截止状态持续放电到下一充电启动状态的放电时长，充电启动状态是指目标电池在保证对外正常供电情况下启动充电的状态；根据补电容量以及放电时长，确定目标电池的健康度。通过设置充电启动状态以确保在电池对外正常放电的情况下完成健康度的检测，避免电池完全放电带来的用电系统故障；并且通过充电过程的补电容量以及放电过程的放电时长，在整个充放电周期内确定的健康度，更加准确。
The present application provides a method, device, and control system for determining battery health. The method includes: obtaining the target battery's recharge capacity from a charge start state to a charge end state, and the discharge duration from the charge end state to the next charge start state. The charge start state refers to the state in which the target battery starts charging while ensuring normal external power supply; determining the target battery's health based on the recharge capacity and discharge duration. By setting the charge start state, the battery's health is tested while the battery is being discharged normally, thus avoiding power system failures caused by complete battery discharge. Furthermore, by using the recharge capacity during the charging process and the discharge duration during the discharge process, the health determined throughout the entire charge and discharge cycle is more accurate.
Description
Technical Field
The present application relates to the field of battery management technologies, and in particular, to a method, an apparatus, and a control system for determining battery health.
Background
The rail transit system comprises two power supply modules, namely a power battery and a storage battery, wherein the power battery is mainly used for supplying power to the power system, and the storage battery is mainly used for supplying power to emergency loads and constant-electricity loads when the power battery does not work. In addition, before the power battery is electrified, the storage battery is also used for supplying power to the control system, and when the power battery is insufficient in electric quantity or fails, the storage battery can also be used as an emergency power supply. Therefore, the normal operation of the battery is critical. The health of a battery is an evaluation index describing the current state and performance of the battery.
In the related art, after the storage battery is completely discharged, the storage battery is fully charged, so that the current capacity of the storage battery is obtained, and the health degree is determined. In the actual use process, the storage battery in the rail transit system needs to supply power for the constant electric load, so the storage battery cannot be completely discharged, the storage battery is completely discharged, the rail transit system is in a high-risk state, and faults are easy to occur.
Disclosure of Invention
The embodiment of the application provides a method, a device and a control system for determining the health degree of a battery.
In a first aspect, an embodiment of the present application provides a method for determining a health degree of a battery, including:
Acquiring the capacitance compensation of a target battery from a charge starting state to a charge stopping state and the discharge duration from the charge stopping state to the next charge starting state, wherein the charge starting state refers to the state that the target battery starts to charge under the condition of ensuring normal external power supply;
and determining the health degree of the target battery according to the charge capacity and the discharge duration.
In one possible embodiment, obtaining the compensation capacity of the target battery from the charge start state to the charge stop state includes:
And determining the capacitance compensation according to the first moment when the target battery is in the charging starting state, the second moment when the target battery reaches the charging cut-off state and the charging current.
In one possible embodiment, determining the compensation capacity according to the first time when the target battery is in the charge start state, the second time when the target battery reaches the charge stop state, and the charging current includes:
and determining the capacitance compensation according to the first moment, the second moment and the charging current of the target battery when the target battery is charged in a constant current voltage limiting mode.
In one possible implementation manner, determining the compensation capacity according to the first time, the second time and the charging current when the target battery is charged in a constant current voltage limiting mode includes:
Determining a second moment according to the charging current of the target battery when the target battery is charged in a constant current voltage limiting mode;
And determining the compensation capacity according to the first moment, the second moment and the charging current.
In one possible embodiment, determining the health of the target battery according to the charge capacity and the discharge duration includes:
determining a power compensation index value according to the power compensation capacity;
Determining a discharge index value according to the discharge duration;
and determining the health degree of the target battery according to the electricity supplementing index value and the discharging index value.
In one possible embodiment, determining the power up indicator value according to the power up capacity includes:
Acquiring rated charging parameters of a target battery;
Determining an expected value of the supplementary capacity of the target battery according to the rated charging parameter;
And determining a power supply index value according to the power supply capacity and the corresponding expected value.
In one possible embodiment, determining the discharge index value according to the discharge duration includes:
acquiring the load power consumption and rated capacity of a target battery;
determining an expected value of the discharge duration of the target battery according to the load power consumption and the rated capacity;
And determining a discharge index value according to the discharge duration and the corresponding expected value.
In one possible embodiment, determining the health of the target battery according to the power replenishment index value and the discharge index value includes:
and determining the health degree of the target battery according to the electricity supplementing index value, the corresponding weight, the discharging index value and the corresponding weight, wherein the sum of the weight corresponding to the electricity supplementing index value and the weight corresponding to the discharging index value is 1.
In a second aspect, an embodiment of the present application provides a method for determining a state of health of a battery, including:
Acquiring the capacitance compensation of a target battery from a charge starting state to a charge stopping state and the discharge duration from the charge stopping state to the next charge starting state, wherein the charge starting state refers to the state that the target battery starts to charge under the condition of ensuring normal external power supply;
determining the health degree of the target battery according to the charge capacity and the discharge duration;
and outputting a corresponding health state according to the health degree of the target battery.
In one possible embodiment, outputting the corresponding health status according to the health of the target battery includes:
comparing the health degree of the target battery with a preset threshold value, and determining the health state of the target battery;
And outputting the health state of the target battery.
In a third aspect, an embodiment of the present application provides a battery health degree determining apparatus, including:
The data acquisition module is used for acquiring the capacitance compensation of the target battery from a charging starting state to a charging stopping state and the discharge duration from the charging stopping state to the next charging starting state, wherein the charging starting state refers to the state that the target battery starts to charge under the condition of ensuring normal power supply to the outside;
And the result determining module is used for determining the health degree of the target battery according to the charge capacity and the discharge duration.
In a fourth aspect, the embodiment of the application provides a control system, which comprises a controller and an acquisition module, wherein the controller is connected with a target battery and the acquisition module and is used for adjusting the charging state of the target battery, and the acquisition module is used for acquiring the voltage and the charging current of the target battery;
The controller is further adapted to determine the health of the target battery based on the voltage and the charging current, in particular to perform the method steps as described above in the first aspect and/or in various possible embodiments of the first aspect.
In one possible embodiment, the control system is a track control system and the target battery is a storage battery.
In a fifth aspect, embodiments of the present application provide a computer device comprising a memory, a processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored in the memory such that the processor performs the various possible implementations of the first aspect and/or the first aspect as described above.
In a sixth aspect, embodiments of the present application provide a computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the various possible implementations of the above first aspect and/or the first aspect.
In a seventh aspect, embodiments of the present application provide a computer program product comprising a computer program which, when executed by a processor, implements the various possible implementations of the above first aspect and/or the first aspect.
The battery health degree determining method, device and control system provided by the embodiment of the application acquire the supplementing capacity of the target battery from the charging starting state to the charging stopping state and the discharging duration from the charging stopping state to the next charging starting state, wherein the charging starting state refers to the state that the target battery starts to charge under the condition of ensuring normal external power supply, and the health degree of the target battery is determined according to the supplementing capacity and the discharging duration. The method has the advantages that the detection of the health degree is finished under the condition that the battery is discharged normally, the power consumption system fault caused by the complete discharge of the battery is avoided, and the health degree is determined in the whole charging and discharging period more accurately through the capacitance compensation of the charging process and the discharging time of the discharging process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a vehicle topology in an urban rail transit system provided by one embodiment;
Fig. 2 is a schematic diagram of an application scenario of a battery health determination method provided in an embodiment;
FIG. 3 is a flowchart illustrating a method for determining battery health according to one embodiment;
FIG. 4 is a second flowchart of a method for determining battery health according to one embodiment;
FIG. 5 is a flowchart of a method for determining battery health according to one embodiment;
FIG. 6 is a flow chart of a method of determining battery state of health provided in one embodiment;
FIG. 7 is a schematic diagram of a battery health detection system provided in one embodiment;
Fig. 8 is a schematic structural view of a battery health determining apparatus provided in one embodiment;
fig. 9 is a schematic structural diagram of a computer device provided in one embodiment.
Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
First, the terms involved in the present application will be explained:
The TCMS system is a Train Control AND MANAGEMENT SYSTEM or Train Control and Monitoring System, namely a Train Control and management system or a Train Control and monitoring system, is a comprehensive Control and management system for a railway system or an urban rail transit system, is responsible for monitoring the running state of a Train and the working condition of key components, and realizes communication and information sharing among all subsystems of the Train through a network. The TCMS system includes a plurality of subsystems, such as a train control subsystem, a vehicle monitoring subsystem, a communication subsystem, an energy management subsystem, and the like. The subsystems are connected together through the network of the TCMS system to realize communication and information sharing.
The urban rail transit comprises two large battery systems, namely a power battery and a storage battery, wherein the power battery is mainly used for supplying power to a power system of a train, and the storage battery is mainly used for supplying power to an emergency load and a constant electric load when the power battery does not work. In addition, before the power battery is electrified, the storage battery is also used for supplying power to the control system, and when the power battery is insufficient in electric quantity or fails, the storage battery can also be used as an emergency power supply. Therefore, the normal operation of the battery is critical. The health of a battery is an evaluation index describing the current state and performance of the battery.
The battery health refers to the degree to which the current state of the battery remains relative to its performance in its fully new state, typically expressed in percent. The method reflects the change condition of key parameters such as capacity, voltage, internal resistance and the like of the battery after multiple charge and discharge cycles. The calculation method of the battery health degree generally compares the current actual capacity of the battery with the rated capacity when leaving the factory, and the obtained ratio is the battery health degree. For example, when a new energy battery leaves a factory with a rated capacity of 100Ah and is used for a certain period of time, the actual capacity is 80Ah, and the health of the battery is 80%.
As shown in the vehicle topology diagram of fig. 1, the power battery mainly supplies power to the motor controller assembly, the PTC assembly, the air conditioner assembly, the air compressor and the floating battery system, and the floating battery system is connected with the low-voltage load of the whole vehicle. In the operation process of the train, the storage battery system is in a floating charge state, and after the train is operated, the whole train is powered off at low voltage, but due to the existence of a constant electric load, the storage battery system is in a low-current discharging working condition, the electric quantity of the storage battery system can be reduced, and the voltage can be slowly reduced. In order to ensure the normal operation of the constant electric load, the voltage of the storage battery system is always larger than the minimum operating voltage, and the storage battery system cannot be completely discharged when the health degree of the storage battery system is detected, so that the data are obtained to determine the health degree.
In view of the above technical problems, an embodiment of the present application provides a method for determining the health of a battery, which may be applied to a process of determining the health of a battery in real time, or may determine the health of each stage of the battery after acquiring data of the battery. For convenience of explanation, the following embodiments of the present application are described in terms of determining real-time health degree.
The battery health degree determining method provided by the embodiment of the application can be applied to an application environment shown in fig. 2. The terminal 102 is configured to monitor a real-time state of the battery, acquire various information of the battery, such as voltage, current, etc., and the terminal 102 is connected to the server 104 through a network, and sends the acquired battery information to the server 104, and the server 104 processes the battery information to determine the health of the battery. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server.
The terminal 102 refers to a terminal device including a sensor or a signal receiver, and may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices and portable wearable devices, where the internet of things devices may be smart speakers, smart televisions, smart air conditioners, smart vehicle devices, and the like. The portable wearable device may be a smart watch, smart bracelet, headset, or the like.
In one embodiment, as shown in fig. 3, a method for determining the health of a battery is provided, and the method is applied to the server 104 in fig. 1 for illustration, and includes the following steps:
Step 302, obtaining the charge capacity of the target battery from a charge starting state to a charge stopping state, and the discharge duration from the charge stopping state to the next charge starting state, wherein the charge starting state refers to a state that the target battery starts to charge under the condition of ensuring normal power supply to the outside;
And step 304, determining the health degree of the target battery according to the charge capacity and the discharge duration.
Wherein, the normal power supply of the target battery means that the target battery can provide stable and continuous electric energy for a connected load. The charging start state refers to a state in which the target battery starts charging when the target battery is in a state in which the target battery can normally supply power. The charge start state is preset, and when the target battery reaches the charge start state, the target battery starts to be charged. The charge start state may be determined based on information such as the voltage, current, or capacity of the battery. The target battery has a charging start voltage, which may be a minimum operating voltage of the target battery, such as 24V, for example, based on the voltage, and may not be externally supplied when the voltage of the target battery is lower than 24V, and may be started to be charged when the voltage of the target battery is lower than 24V. In addition, the charging start voltage may be any voltage set in advance under the condition that the target battery is ensured to be capable of discharging outwards, for example, when the lowest working voltage is 24V, the charging start voltage is set to 28V. When the voltage of the target battery is detected to be reduced to 28V, charging of the target battery is started.
Similarly, the charge-off state refers to a state in which the target battery is off-charged, and the charge-off state can be determined based on information such as the voltage, current, or capacity of the battery. Whether the battery reaches the charge cutoff state is judged by, for example, the charge cutoff voltage. It is understood that the charge cutoff voltage is greater than the charge start voltage.
And after the target battery reaches the charging start state, charging the target battery until the target battery reaches the charging stop state, and stopping charging. The charging process of the target battery may be controlled by the server 104, or may be controlled by other control systems. It should be noted that, in the embodiment of the present application, after the target battery starts to be charged from the charging start state to the charging stop state, the target battery may supply power to the external load or may not discharge. For example, when applied to an urban rail transit system, the battery is always in a discharged state when the health of the battery is determined. But for batteries in other application scenarios may be charging without external load.
The capacity of the target battery from the charge start state to the charge stop state refers to the amount of electricity received by the target battery during the charging process, and reflects the amount of electricity required to be received by the target battery from the charge start state to the charge stop state, and is generally expressed by ampere hours (Ah) or milliampere hours (mAh). In one embodiment, the charge initiation state is determined by a charge initiation voltage of the battery, and the charge termination state is determined by a charge termination voltage of the battery, the supplemental capacity also reflects the amount of charge received by the battery to recover from the lowest state of charge to the fully charged state.
The compensation capacity can be obtained by direct measurement, such as by obtaining charging current and calculating charging time. Specifically, in one embodiment, obtaining the compensation capacity of the target battery from the charge start state to the charge stop state includes:
And determining the capacitance compensation according to the first moment when the target battery is in the charging starting state, the second moment when the target battery reaches the charging cut-off state and the charging current.
The first time refers to the time when the target battery starts to charge, the second time refers to the time when the target battery stops to charge, and the charging duration of the target battery is determined through the time difference between the first time and the second time. The charging current refers to the current in the charging loop of the target battery, and in this embodiment, the charging current may be real-time current in the charging process of the target battery, that is, the current at each moment may change, and the capacitance compensation in the charging process may be obtained by recording the real-time charging current from the first moment to the second moment and integrating the real-time charging current from the first moment to the second moment.
The charging current can also be a fixed value, and the charging current is controlled according to the charging process of the target battery, so that the current is in a constant state in the charging process of the target battery, for example, the target battery is charged in a constant current voltage limiting mode, the constant charging current can be determined only by acquiring the current once, and the capacitance compensation is determined through the constant charging current and the charging time. Of course, in the above process, in order to ensure the accuracy of the obtained charging current, the charging current may be sampled multiple times, and the unique charging current may be determined according to the sampling result. The number of samples is less than the number of samples of the real-time charging current.
In the method provided by the embodiment, based on the definition of the battery capacity, the compensation capacity is directly calculated through the charging current and the charging time, so that the more accurate compensation capacity can be rapidly and directly determined.
The discharging time period refers to the time period from the charge cut-off state to the charge start state of the target battery under the condition of an external load, and in the process, the target battery is only discharged and not charged. The discharge duration is directly determined by detecting the time when the target battery is in the charge stop state and the time when the target battery reaches the charge start state again.
It should be noted that, the charge capacity and the discharge duration are for the same target battery, and precisely, the same target battery is obtained in the same stage, so that the health degree of the target battery in the current stage is determined according to the obtained charge capacity and the discharge duration. Therefore, the acquisition of the charge capacity and the discharge duration is generally determined based on the two successive times of reaching the charge start state. Specifically, after the target battery reaches the charge start state, charging the target battery can be started, the charge capacity is determined according to the process from the charge start state to the charge stop state, and then the target battery starts discharging and reaches the charge start state again from the charge stop state, so that the discharging duration in the process is obtained.
And after the charge capacity and the discharge time are determined, measuring the health degree of the current stage through the charge capacity and the discharge time of the target battery in the current stage.
In the method provided by the embodiment, the supplementing capacity of the target battery from the charging starting state to the charging stopping state and the discharging time from the charging stopping state to the next charging starting state are obtained, and the health degree of the target battery is determined according to the supplementing capacity and the discharging time. The method has the advantages that the detection of the health degree is finished under the condition that the battery is discharged normally, the power consumption system fault caused by the complete discharge of the battery is avoided, and the health degree is determined in the whole charging and discharging period more accurately through the capacitance compensation of the charging process and the discharging time of the discharging process.
In one embodiment, determining the supplementary capacity according to a first time when the target battery is in a charge start state, a second time when the target battery reaches a charge stop state, and a charging current includes:
and determining the capacitance compensation according to the first moment, the second moment and the charging current of the target battery when the target battery is charged in a constant current voltage limiting mode.
The constant-current voltage limiting mode is a battery charging mode and is characterized in that charging current is kept constant in the charging process, and meanwhile charging voltage is limited not to exceed a certain set threshold value. The constant charging current is beneficial to ensuring that the battery receives electric energy at a stable speed, thereby avoiding adverse effects on the battery caused by current fluctuation in the charging process. The voltage limitation may ensure that the battery does not exceed its highest voltage that it can withstand during charging. This helps to protect the battery from overcharge damage, extending the life of the battery.
In one embodiment, determining the compensation capacity according to a first time, a second time and a charging current when the target battery is charged in a constant current voltage limiting mode includes:
Determining a second moment according to the charging current of the target battery when the target battery is charged in a constant current voltage limiting mode;
And determining the compensation capacity according to the first moment, the second moment and the charging current.
During the charging process, the battery can react chemically inside, resulting in a change in the voltage and current of the battery. In the constant current voltage limiting charging mode, the charging current is kept constant in the initial stage, and the battery voltage gradually rises along with the increase of the battery electric quantity. When the battery voltage reaches a predetermined constant voltage charging period, the charging current will start to gradually decrease, because the chemical reaction inside the battery gradually goes to equilibrium, and the battery approaches a full state.
A preset threshold and a preset duration are set for the charging current generally, and whether the target battery is fully charged or not is judged, so that the charging cut-off state is achieved. The preset threshold value, which represents a lower level to which the charging current should reach when the battery is near full charge, may be specifically set based on the capacity and charging characteristics of the battery. This preset threshold is typically a fixed proportion of the battery capacity, for example 5% or less. In addition to the charging current being required to be less than a preset threshold, this smaller current value is required for a period of time to ensure that the battery has indeed been full. This preset duration is typically set according to the type of battery, the capacity, and the performance of the charger.
When the charging current is less than the preset threshold value for a preset period of time, the battery may be considered to have been fully charged. This is because at this stage the chemical reaction inside the battery has been substantially completed and the battery charge has approached or reached its maximum capacity. Illustratively, when the charging current is <2A and lasts for 1h, it is determined that the target battery reaches the charge-off state, and the second time is recorded.
In the method provided by the embodiment, on the basis of adopting a constant-current voltage limiting mode to charge, the characteristics of a constant-current voltage limiting charging process are combined, and whether the target battery reaches a charging cut-off state is rapidly and accurately judged according to the charging current.
In one embodiment, as shown in fig. 4, determining the health of the target battery according to the charge capacity and the discharge duration includes:
step 402, determining a power compensation index value according to the power compensation capacity;
Step 404, determining a discharge index value according to the discharge time length;
step 406, determining the health of the target battery according to the power-up index value and the discharge index value.
The electricity supplementing index is an index for measuring health degree in the charging process, and the electricity supplementing index value is determined through the electricity supplementing capacity. The discharge index is an index for measuring the health degree in the discharge process, and the discharge index value is determined by the discharge duration.
As the battery is used and aged, its health degree gradually decreases, which is manifested by a decrease in the active material inside the battery, a change in the concentration of the electrolyte, and the like. These variations may result in a decrease in the amount of charge that the battery can receive during charging, i.e., a decrease in the charge capacity. During discharge, a battery with reduced health may result in a decrease in the amount of electrical energy that the battery can discharge, i.e., a decrease in the discharge duration, due to a decrease in the internal active material and a decrease in the chemical reaction rate. Therefore, according to the charge capacity and the discharge duration of the target battery, the index value related to the health degree during the charge process and the discharge process is determined, and the health degree of the target battery is determined.
Specifically, the power supply index value and the discharge index value can be respectively determined by the obtained power supply capacity and the discharge duration of the target battery in the current stage and the power supply capacity and the discharge duration of the target battery in the lossless state, so that the health degree is determined. The capacity of the target battery in the lossless state and the discharge time period generally refer to data determined when the target battery is not used and aged, and are determined based on the charge start state and the charge stop state at the time of determination. For example, the charge capacity and the discharge duration of the target battery in the current stage are determined by the set charge starting voltage and charge stopping voltage, and then the charge capacity and the discharge duration of the target battery in the lossless state are also determined based on the set charge starting voltage and charge stopping voltage.
After obtaining the power supply index value and the discharge index value, the average of the two index values may be determined as a health degree in the form of a percentage. The health degree of the target battery can be determined according to the electricity supplementing index value, the corresponding weight, the discharging index value and the corresponding weight, and the sum of the weight corresponding to the electricity supplementing index value and the weight corresponding to the discharging index value is 1.
Wherein the weight corresponding to the index value indicates the influence degree of the index on the health degree. When the average of two index values is used to determine the health, it may be determined that the weight corresponding to each index is 50%. And multiplying each index value by the corresponding weight of the index value, and then superposing the index values to obtain the health degree. Health is a percentage, ranging in size from 0 to 100%.
In the method provided by the embodiment, the more accurate health degree is obtained by collecting the capacitance compensation and the discharge time length of the target battery between two charges and comparing the standard data of the target battery.
In one embodiment, as shown in fig. 5, determining the power compensation index value according to the compensation capacity includes:
step 502, obtaining rated charging parameters of a target battery;
step 504, determining the expected value of the supplementary capacity of the target battery according to the rated charging parameters;
Step 506, determining a power compensation index value according to the power compensation capacity and the corresponding expected value.
The rated charging parameters refer to charging parameters of the target battery in a lossless state, and include charging current, charging voltage, charging duration and the like. The expected value of the supplementary capacity refers to the supplementary capacity from the charge start state to the charge stop state in the lossless state of the target battery, and represents the maximum supplementary capacity of the target battery. If the rated charge parameter is known, the expected value of the capacity of the target battery from the charge start state to the charge stop state is calculated according to the rated charge parameter. And taking the ratio of the supplementing capacitance to the corresponding expected value as a supplementing index value to represent the health degree of the target battery in the charging process.
In the method provided in the above embodiment, the expected value of the supplementary capacitance from any charging start state to the charging stop state may be calculated by the rated charging parameter.
In one embodiment, determining a discharge index value according to a discharge duration includes:
acquiring the load power consumption and rated capacity of a target battery;
determining an expected value of the discharge duration of the target battery according to the load power consumption and the rated capacity;
And determining a discharge index value according to the discharge duration and the corresponding expected value.
The load power consumption of the target battery refers to the power consumption of the external load of the target battery under the condition of no charging. In some cases, the load power consumption of the target battery is considered to be fixed. The rated capacity refers to the maximum amount of electricity that the battery can discharge under certain conditions. The expected value of the discharge duration of the target battery is calculated at the rated capacity by the load power consumption. Specifically, the load current, i.e., the discharge current, of the target battery can be determined by the load power consumption, and then the expected value of the discharge time period is calculated according to the load current and the rated capacity. And taking the ratio of the discharge time length to the corresponding expected value as a discharge index value to represent the health degree of the target battery in the discharge process.
According to the method provided by the embodiment, through the load power consumption and the rated capacity, the expected value of the discharge time length under the use scene of the target battery can be obtained under the condition of combining the load, and the certainty of the health degree detection result can be effectively improved.
In some embodiments, the charging and discharging control may be performed on the target battery before the target battery is not used, so as to obtain the expected value of the capacitance compensation and the expected value of the discharging duration of the target battery in the lossless state. When the battery health degree determining method provided by the embodiment of the application determines the health degree of the target battery, the expected value of the prestored compensation capacity and the expected value of the discharge time length are directly called.
There is also provided in one embodiment a battery state of health determination method, as shown in fig. 6, the method comprising:
Step 602, obtaining a charge capacity of the target battery from a charge start state to a charge stop state, and a discharge duration from the charge stop state to a next charge start state, where the charge start state refers to a state in which the target battery starts charging under a condition of ensuring normal power supply to the outside;
step 604, determining the health degree of the target battery according to the charge capacity and the discharge time;
step 606, outputting the corresponding health status according to the health degree of the target battery.
The steps 602-604 of determining the target battery health in the method refer to the explanation of the battery health determination method in the above embodiment, and are not described herein.
After determining the health degree of the target battery, outputting the health state of the target battery according to the health degree so that a user can know the state of the target battery. Specifically, the health degree numerical value can be directly output to represent the health state of the target battery, the health degree is displayed to the user through the display system, and the user knows the health state of the target battery according to the health degree numerical value.
In one embodiment, outputting the corresponding state of health according to the health of the target battery further comprises:
comparing the health degree of the target battery with a preset threshold value, and determining the health state of the target battery;
And outputting the health state of the target battery.
The preset threshold is used for representing the health degree of the target battery, and the health state of the target battery is determined by comparing the health degree of the target battery with the preset threshold. The number of the preset thresholds may be one or more, and the corresponding determined health states of the target battery have more than 2 state levels.
The preset threshold value includes a first threshold value and a second threshold value, the first threshold value is greater than the second threshold value, the health state of the target battery is determined to be healthy when the health degree is not less than the first threshold value, the health state of the target battery is determined to be sub-healthy when the health degree is less than the first threshold value and not less than the second threshold value, and the health state of the target battery is determined to be dangerous when the health degree is less than the second threshold value.
When the state of health of the target battery is output, determining the data type of the output state of health according to the type of the display device receiving the state of health of the target battery. For example, a display device is connected to display the health status of the target battery, and the health status can be directly sent to the display device for display, including text display. In addition, when different health states are characterized by different indicator lamps or different colors, the health states are converted into corresponding data and then transmitted.
In the method provided by the embodiment, the health degree of the target battery is determined through the electric capacity compensation of the target battery in the using process and the discharging time between the two electric power compensation, and meanwhile, the maintenance of the target battery is pre-warned through the health degree. The staff can maintain in time according to the health status of output.
Based on the method, the embodiment of the application provides a control system, which comprises a controller and an acquisition module, wherein the controller is connected with a target battery and the acquisition module and is used for adjusting the charging state of the target battery, and the acquisition module is used for acquiring the voltage and the charging current of the target battery;
The controller is further configured to determine the health of the target battery based on the voltage and the charging current, and is specifically configured to perform the method steps in the above embodiments.
In one embodiment, the control system is a track control system and the target battery is a storage battery.
Specifically, for the electronic system of the urban rail transit system described in the vehicle topology diagram of fig. 1, a method and a system for detecting the health degree of a storage battery are provided, as shown in fig. 7, the system comprises a controller 701 and a collection module 702, wherein the controller 701 is connected with a target battery 703 and the collection module 702, and is used for adjusting the charging state of the target battery 703, and the collection module 702 is used for obtaining the voltage and the charging current of the target battery 703;
The controller 701 is further configured to determine the health of the target battery 703 according to the voltage and the charging current, and output a corresponding health status.
Specifically, the system may be a TCMS system, when the TCMS system collects that the voltage of the storage battery system is lower than the charging start voltage U 1, the time is recorded as t0, the TCMS controls the high-voltage power-on of the vehicle power battery, starts the DC-DC converter, and charges the storage battery system in a constant-current voltage limiting mode. Meanwhile, the TCMS acquires the charging current i (t) of the storage battery system in real time.
When the TCMS system detects that the battery is full (charging current <2A for 1 h), the TCMS controls the vehicle to power down, which is noted as t1.
The TCMS system calculates the compensation capacity of the storage battery:
;
The battery system continues to discharge at a small current due to the presence of the constant electrical load.
When the TCMS collects that the voltage of the storage battery system is lower than U 1 again, the time is recorded as t2, the TCMS controls the high-voltage upper voltage of the vehicle power battery again, and the DC-DC converter is started to charge the storage battery system. The TCMS system calculates the time Δt from t1 to t 2.
The TCMS obtains the expected value of the full charge capacity from U1 to full charge of the brand new battery of the same model as the battery as C v.
The load power consumption of the storage battery system under the condition of vehicle power-off is measured, and the time when the storage battery is discharged from the full-power state to U1 is calculated as t v according to rated capacity C 0.
The TCMS system calculates the state of health SOH of the battery according to the following formula:
;
Wherein when If not less than 1, thenThe value is assigned to be 1, and in the same way,If not less than 1, thenAssigned a value of 1.
Setting a first threshold q and a second threshold p, when SOH is more than or equal to q, the TCMS system sends a healthy state to the intelligent operation and maintenance system, when p is less than or equal to SOH < q, the TCMS system sends a sub-healthy state to the intelligent operation and maintenance system, operation and maintenance personnel can prepare spare parts, and when SOH is less than or equal to SOH < p, the TCMS system sends a replacement requesting state to the intelligent operation and maintenance system, and the operation and maintenance personnel can replace a storage battery.
In this embodiment, U 1 is 24V, n is 0.5, and the constant-current voltage-limiting charging mode is that the DC-DC converter charges the battery system to 28V with a constant current at a charging rate of 0.3C, and then outputs the battery with a constant voltage of 28V, and the charging current of the battery is gradually reduced as the charging capacity increases.
In this embodiment, p=30%, q=40%. The p and q values can be flexibly adjusted, and in general, the p value is the minimum value of the storage battery system when the storage battery system can meet the user demand, and the q value is the p value plus the attenuation value of the storage battery system in the period of arrival of the storage battery system. Some margin may be left in place to ensure usability of the system.
In the above embodiment, the charging start voltage U 1 is not limited to 24V, but may be other voltages. The charge cut-off state is not limited to a full charge state, but may also be characterized by setting a charge cut-off voltage.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiments of the present application further provide a battery health determining device, where the implementation of the solution to the problem provided by the device is similar to the implementation described in the above method, so specific limitations in one or more embodiments of the battery health determining device provided below may be referred to the above limitations of the battery health determining method, and will not be repeated herein.
In one embodiment, as shown in fig. 8, there is provided a battery health determination apparatus 800, the apparatus 800 including a data acquisition module 801 and a result determination module 802:
The data obtaining module 801 is configured to obtain a charge capacity of the target battery from a charge start state to a charge stop state, and a discharge duration from the charge stop state to a next charge start state, where the charge start state refers to a state in which the target battery starts charging under a condition of ensuring normal external power supply;
the result determining module 802 is configured to determine the health of the target battery according to the charge capacity and the discharge duration.
Fig. 9 is a schematic structural diagram of a computer device according to the present application. As shown in fig. 9, the electronic device 90 provided in this embodiment includes at least one processor 901 and a memory 902. Optionally, the device 90 further comprises a communication component 903. The processor 901, the memory 902, and the communication unit 903 are connected via a bus 904.
In a specific implementation, at least one processor 901 executes computer-executable instructions stored in a memory 902, such that the at least one processor 901 performs the methods described above.
The specific implementation process of the processor 901 may refer to the above-mentioned method embodiment, and its implementation principle and technical effects are similar, and this embodiment will not be described herein again.
In the above embodiment, it should be understood that the Processor may be a central processing unit (english: central Processing Unit, abbreviated as CPU), or may be other general purpose processors, digital signal processors (english: DIGITAL SIGNAL Processor, abbreviated as DSP), application specific integrated circuits (english: application SPECIFIC INTEGRATED Circuit, abbreviated as ASIC), or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.
The Memory may include high-speed Memory (Random Access Memory, RAM) or may further include Non-volatile Memory (NVM), such as at least one disk Memory.
The bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (PERIPHERAL COMPONENT, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or to one type of bus.
The application also provides a computer program product comprising a computer program which, when executed by a processor, implements the method described above.
The application also provides a computer readable storage medium, wherein computer execution instructions are stored in the computer readable storage medium, and when a processor executes the computer execution instructions, the method is realized.
The above-described readable storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. A readable storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. In the alternative, the readable storage medium may be integral to the processor. The processor and the readable storage medium may reside in an Application SPECIFIC INTEGRATED Circuits (ASIC). The processor and the readable storage medium may reside as discrete components in a device.
The division of units is merely a logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. The storage medium includes a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps of implementing the various method embodiments described above may be implemented by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs the steps comprising the method embodiments described above, and the storage medium described above includes various media capable of storing program code, such as ROM, RAM, magnetic or optical disk.
Finally, it should be noted that other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any adaptations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains and as may be applied to the precise construction hereinbefore set forth and shown in the drawings and as follows in the scope of the appended claims. The scope of the invention is limited only by the appended claims.
Claims (16)
1. A method of determining battery health, the method comprising:
Acquiring the capacitance compensation of a target battery from a charge starting state to a charge stopping state and the discharge duration from the charge stopping state to the next charge starting state, wherein the charge starting state refers to a state that the target battery starts to charge under the condition of ensuring normal power supply to the outside;
and determining the health degree of the target battery according to the charge capacity and the discharge duration.
2. The method of claim 1, wherein the obtaining the capacity of the target battery from the charge-on state to the charge-off state comprises:
and determining the capacitance compensation amount according to the first moment when the target battery is in the charging starting state, the second moment when the target battery reaches the charging cut-off state and the charging current.
3. The method of claim 2, wherein the determining the supplemental capacity based on the first time when the target battery is in the charge-on state, the second time when the charge-off state is reached, and a charging current comprises:
And determining the capacitance compensation amount according to the first moment and the second moment of the target battery when the target battery is charged in a constant current voltage limiting mode and the charging current.
4. The method of claim 3, wherein determining the supplemental capacity based on the first time, the second time, and the charging current of the target battery when charged in a constant current voltage limiting manner comprises:
Determining the second moment according to the charging current of the target battery when the target battery is charged in a constant current voltage limiting mode;
And determining the capacitance compensation amount according to the first moment, the second moment and the charging current.
5. The method of claim 1, wherein said determining the health of the target battery based on the supplemental capacity and the discharge duration comprises:
Determining a power supply index value according to the power supply capacity;
determining a discharge index value according to the discharge duration;
And determining the health degree of the target battery according to the electricity supplementing index value and the discharging index value.
6. The method of claim 5, wherein determining a make-up indicator value based on the make-up capacitance comprises:
acquiring rated charging parameters of the target battery;
Determining an expected value of the supplementary capacity of the target battery according to the rated charging parameter;
and determining the electricity supplementing index value according to the electricity supplementing capacity and the corresponding expected value.
7. The method of claim 5, wherein the determining a discharge index value based on the discharge duration comprises:
acquiring the load power consumption and rated capacity of the target battery;
determining an expected value of the discharge duration of the target battery according to the load power consumption and the rated capacity;
And determining the discharge index value according to the discharge duration and the corresponding expected value.
8. The method of claim 5, wherein determining the health of the target battery based on the power up indicator value and the discharge indicator value comprises:
And determining the health degree of the target battery according to the electricity supplementing index value, the corresponding weight, the discharging index value and the corresponding weight, wherein the sum of the weight corresponding to the electricity supplementing index value and the weight corresponding to the discharging index value is 1.
9. A method of determining a state of health of a battery, the method comprising:
Acquiring the capacitance compensation of a target battery from a charge starting state to a charge stopping state and the discharge duration from the charge stopping state to the next charge starting state, wherein the charge starting state refers to a state that the target battery starts to charge under the condition of ensuring normal power supply to the outside;
determining the health degree of the target battery according to the charge capacity and the discharge duration;
And outputting a corresponding health state according to the health degree of the target battery.
10. The method of claim 9, wherein outputting the corresponding state of health according to the degree of health of the target battery comprises:
Comparing the health degree of the target battery with a preset threshold value, and determining the health state of the target battery;
and outputting the health state of the target battery.
11. A battery health determination apparatus, the apparatus comprising:
the data acquisition module is used for acquiring the capacitance compensation of the target battery from a charging starting state to a charging stopping state and the discharge duration from the charging stopping state to the next charging starting state continuously, wherein the charging starting state refers to a state of starting charging of the target battery under the condition of ensuring normal external power supply;
And the result determining module is used for determining the health degree of the target battery according to the capacitance compensation and the discharging duration.
12. The control system is characterized by comprising a controller and an acquisition module, wherein the controller is connected with a target battery and the acquisition module and is used for adjusting the charging state of the target battery, and the acquisition module is used for acquiring the voltage and the charging current of the target battery;
The controller is further configured to determine the health of the target battery based on the voltage and the charging current, in particular to perform the method steps of claims 1-8.
13. The system of claim 12, wherein the control system is a track control system and the target battery is a storage battery.
14. A computer device comprises a memory and a processor;
The memory stores computer-executable instructions;
The processor executing computer-executable instructions stored in the memory, causing the processor to perform the method of any one of claims 1-8.
15. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1-8.
16. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1-8.
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