CN117811138A - High-voltage battery pre-charging method, apparatus, device, storage medium, and program product - Google Patents
High-voltage battery pre-charging method, apparatus, device, storage medium, and program product Download PDFInfo
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Abstract
The present application relates to a high voltage battery pre-charging method, apparatus, computer device, storage medium and computer program product. The method comprises the following steps: acquiring real-time working condition data of a low-voltage battery; determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data; and controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current, and stopping the precharge process of the high-voltage battery until the high-voltage battery meets the high-voltage electrifying condition. The method can dynamically regulate and control the pre-charging process in real time based on the real-time working condition data of the low-voltage battery, and balance of the discharging capacity and the high-voltage pre-charging time of the low-voltage battery is realized, so that the service life of the low-voltage battery is ensured, and the success of high-voltage pre-charging under various working conditions is ensured.
Description
Technical Field
The present disclosure relates to the field of electric vehicle driving technologies, and in particular, to a high-voltage battery pre-charging method, a device, a computer device, a storage medium, and a computer program product.
Background
In the driving system of the electric automobile, a high-voltage battery is connected with a motor controller, and a capacitor with larger capacity is arranged in the motor controller. If the capacitor is in a zero state before power-on, the capacitor is equivalent to direct short circuit at the moment of circuit closing, and the battery and the relay are damaged by huge impact caused by very large current. Therefore, a pre-charging circuit is added to the power supply system of the electric automobile to reduce the impact current during power-on and protect the motor controller, the battery and the main relay. The precharge circuit is a typical first-order RC series circuit, and if the precharge relay or the precharge resistor is abnormal in the precharge process, the power-up failure is caused.
To solve the above problems, a high-voltage battery pre-charging system as shown in fig. 1 is currently used to control the pre-charging process of the high-voltage battery. The direct current converter is used for converting low-voltage energy of the low-voltage battery into high-voltage energy and charging a bus capacitor of the motor controller through the high-voltage energy, and the direct current converter is used for adjusting the pre-charging voltage according to specific working conditions so as to realize the pre-charging control function. In the method, the low-voltage battery and the direct-current converter replace a pre-charging relay or a pre-charging resistor in a traditional pre-charging circuit, so that the condition that the pre-charging relay or the pre-charging resistor affects high-voltage power-on due to abnormal conditions is avoided.
However, in the conventional precharge control method, if the low-voltage battery is abnormal (for example, the low-voltage battery is in an overdischarged state), the high-voltage battery fails to be precharged.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a high-voltage battery pre-charging method, apparatus, computer device, storage medium, and computer program product that can avoid abnormality of the high-voltage battery, thereby causing failure in pre-charging the high-voltage battery.
In a first aspect, the present application provides a method for pre-charging a high voltage battery, the method comprising:
acquiring real-time working condition data of a low-voltage battery;
determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data;
and controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current, and stopping the precharge process of the high-voltage battery until the high-voltage battery meets the high-voltage electrifying condition.
In one embodiment, the real-time operating condition data includes real-time temperature and real-time state of charge; the determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data comprises the following steps:
acquiring the association relation between the temperature, the state of charge and the safe discharge current of the low-voltage battery;
and based on the association relation, determining the maximum safe discharge current corresponding to the real-time temperature and the real-time state of charge, and taking the maximum safe discharge current as the current safe pre-charge current of the high-voltage battery.
In one embodiment, the method further comprises:
determining a minimum discharge voltage of the low-voltage battery based on the real-time working condition data in the pre-charging process of the high-voltage battery;
detecting a real-time voltage of the low-voltage battery;
and if the real-time voltage is smaller than or equal to the minimum discharge voltage, stopping the pre-charging process of the high-voltage battery.
In one embodiment, the method further comprises:
and if the real-time voltage is larger than the minimum discharge voltage, continuing to execute the step of controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current.
In one embodiment, the real-time operating condition data includes a real-time state of charge, and the method further includes:
and if the real-time state of charge is greater than a preset state of charge, executing the step of determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data.
In one embodiment, the method further comprises:
and if the real-time charge state is smaller than or equal to the preset charge state, stopping the pre-charging process of the high-voltage battery.
In a second aspect, the present application also provides a high voltage battery pre-charging device. The device comprises:
the acquisition module is used for acquiring real-time working condition data of the low-voltage battery;
the determining module is used for determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data;
and the pre-charging module is used for controlling the direct-current converter to pre-charge the high-voltage battery according to the current safe pre-charging current until the high-voltage battery meets the high-voltage charging condition, and stopping the pre-charging process of the high-voltage battery.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the high-voltage battery pre-charging method when executing the computer program.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the high voltage battery pre-charging method described above.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of the high voltage battery pre-charging method described above.
According to the high-voltage battery pre-charging method, the device, the computer equipment, the storage medium and the computer program product, the state and the working condition of the low-voltage battery can be accurately known by acquiring the real-time working condition data of the low-voltage battery, so that the low-voltage battery is ensured to be not excessively charged or discharged in the charging process, and the high-voltage battery is prevented from being damaged or hidden danger is avoided. Meanwhile, the current safe pre-charging current of the high-voltage battery is determined based on the real-time working condition data of the low-voltage battery, and the pre-charging state of the direct-current converter is dynamically adjusted in real time based on the current safe pre-charging current, namely, the pre-charging process can be dynamically adjusted and controlled in real time based on the real-time working condition data of the low-voltage battery, so that the discharging capacity of the low-voltage battery and the balance of the high-voltage pre-charging time are realized, the charging process is ensured to be carried out within the bearable range of the high-voltage battery, the problem of pre-charging failure caused by the abnormality of the low-voltage battery is avoided, and the success of high-voltage pre-charging under various working conditions is ensured.
Drawings
FIG. 1 is a block diagram of a high voltage battery pre-charge system in one embodiment;
FIG. 2 is an application environment diagram of a high voltage battery pre-charge method in one embodiment;
FIG. 3 is a flow chart of a method of pre-charging a high voltage battery in one embodiment;
FIG. 4 is a control flow diagram of a high voltage battery pre-charge method in one embodiment;
FIG. 5 is a block diagram of a high voltage battery pre-charge device according to one embodiment;
fig. 6 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In a driving system of an electric automobile, a high-voltage battery is connected with a motor controller, and in order to reduce the impact of power-on to the high-voltage battery, a pre-charging circuit is required to be added to a power supply system of the electric automobile so as to reduce the impact current during power-on and protect the motor controller, the battery and a main relay. The precharge circuit is a typical first-order RC series circuit, and if the precharge relay or the precharge resistor is abnormal in the precharge process, the power-up failure is caused.
To solve the above problems, a pre-charging system as shown in fig. 1 is currently used to control the pre-charging process of the high-voltage battery. The direct current converter is used for converting low-voltage energy of the low-voltage battery into high-voltage energy and precharging the high-voltage battery, and the direct current converter is used for adjusting the precharge voltage of the high-voltage battery according to specific working conditions so as to realize a precharge control function. In the method, the low-voltage battery and the direct-current converter replace a pre-charging relay or a pre-charging resistor in a traditional pre-charging circuit, so that the condition that the pre-charging relay or the pre-charging resistor affects high-voltage power-on due to abnormal conditions is avoided.
However, in the conventional precharge control method, if the low-voltage battery is abnormal (for example, the low-voltage battery is in an overdischarged state), the high-voltage battery fails to be precharged.
Therefore, in order to avoid the problem of high-voltage battery pre-charging failure caused by low-voltage battery abnormality, the embodiment of the application provides a high-voltage battery pre-charging method, which is used for acquiring real-time working condition data of a low-voltage battery, dynamically regulating and controlling a pre-charging process in real time according to the real-time working condition data, realizing balance of discharging capacity and high-voltage pre-charging time of the low-voltage battery, ensuring that a charging process is carried out within a bearable range of the high-voltage battery, avoiding the problem of pre-charging failure caused by high-voltage battery abnormality, and ensuring that high-voltage pre-charging is successful under various working conditions.
The high-voltage battery pre-charging method provided by the embodiment of the application can be applied to an application environment shown in fig. 2. The vehicle controller 102 acquires real-time working condition data of the high-voltage battery 104, and the vehicle controller 102 determines the current safe pre-charging current of the high-voltage battery 106 based on the real-time working condition data; the vehicle controller 102 controls the dc converter 108 to precharge the high-voltage battery 106 according to the current safe precharge current, until the high-voltage battery 106 satisfies the high-voltage condition, and stops the precharge process of the high-voltage battery 106.
In one embodiment, as shown in fig. 3, a high-voltage battery pre-charging method is provided, and the method is applied to the whole vehicle controller in fig. 1 for illustration, and includes the following steps:
step 302, acquiring real-time working condition data of the low-voltage battery.
Wherein, the low-voltage battery refers to a battery with voltage lower than 36V. The low-voltage battery may be composed of a plurality of unit cells connected in series. For example, the low-voltage battery of this embodiment is a 12V lithium battery, and the 12V lithium battery is formed by connecting three 3.7V lithium batteries in series.
In some embodiments, the low voltage battery may employ a lithium battery. The lithium battery is used as a low-voltage energy source, and compared with a lead-acid battery, the lithium battery has the advantages of light weight and small size. The volume of the lithium battery is 2/3 of the volume of the lead-acid battery, and the weight is about 1/3 of the weight of the lead-acid battery. The lithium battery with the same volume is higher than the lead-acid battery in capacity, the electric automobile is lighter due to the weight reduction, and the cruising ability is increased by about 10%.
The real-time working condition data of the low-voltage battery refers to data which is collected and reflected in real time in the running process of the low-voltage battery. For example, the real-time working condition data of the low-voltage battery comprises information such as real-time voltage, real-time current, real-time temperature, internal resistance, real-time electric quantity, charge and discharge times, charge and discharge efficiency, health condition and the like of the low-voltage battery.
Specifically, the whole vehicle controller collects real-time working condition data of the low-voltage battery in real time.
In some embodiments, as shown in fig. 1, the vehicle controller obtains real-time operating condition data of the low-voltage battery through a battery management system (first BMS system) of the low-voltage battery. Specifically, a communication connection is established between the whole vehicle controller and the first BMS system, and data transmission is performed through a CAN bus or other communication protocols. The first BMS system is responsible for monitoring real-time working condition data such as voltage, current and temperature of the low-voltage battery, packaging the data into a corresponding communication protocol format, and then sending the data to the whole vehicle controller through communication connection. After the whole vehicle controller receives the data sent by the first BMS system, the data can be analyzed and processed, and the required real-time working condition data can be extracted.
Step 304, determining the current safe pre-charge current of the high-voltage battery based on the real-time working condition data.
The high-voltage battery refers to a battery with voltage higher than 36V, and common high-voltage battery voltages are 48V, 60V, 72V and the like.
The current safe pre-charge current of the high-voltage battery refers to the current maximum charge current of a bus capacitor of a motor controller, and the maximum charge current is the maximum discharge current of the low-voltage battery. As shown in fig. 1, the high-voltage battery is connected with the motor controller, the motor controller is provided with a capacitor with larger capacity, the capacitor is called a bus capacitor, a contactor is arranged between the high-voltage battery and the direct-current converter, the high-voltage battery and the direct-current converter are disconnected in the pre-charging process of the high-voltage battery, the current safe pre-charging current charges the bus capacitor of the motor controller, in the process, the voltage of the bus capacitor is detected in real time, when the difference value between the voltage of the bus capacitor and the voltage at two ends of the high-voltage battery is within a preset range, the high-voltage battery is determined to meet the high-voltage charging condition, at the moment, the circuit between the high-voltage battery and the direct-current converter is connected through the contactor, the direct-current converter charges the high-voltage battery, and the pre-charging process of the high-voltage battery is ended.
In this embodiment, as shown in fig. 1, the low-voltage battery is connected to the low-voltage side of the dc converter, the motor controller is connected to the high-voltage side of the dc converter, and the dc converter converts the low-voltage energy of the low-voltage battery into high-voltage energy and charges the bus capacitor of the motor controller through the high-voltage energy. In this case, there is a relationship between the real-time working condition data of the low-voltage battery and the current safe pre-charging current of the bus capacitor of the motor controller, that is, the real-time working condition data of the low-voltage battery determines the input condition and the conversion characteristic of the dc converter, and the current safe pre-charging current of the bus capacitor of the motor controller defines the maximum output current of the dc converter.
Specifically, the vehicle controller determines the maximum discharge current of the battery based on real-time working condition data, and takes the maximum discharge current as the current safe pre-charge current of the bus capacitor of the motor controller.
In some embodiments, as shown in fig. 1, the vehicle controller acquires the voltage value of the high-voltage battery through a battery management system (second BMS system) of the high-voltage battery. Specifically, a communication connection is established between the whole vehicle controller and the second BMS system, and data transmission is performed through a CAN bus or other communication protocols. The second BMS system is responsible for monitoring real-time working condition data such as voltage, current and temperature of the high-voltage battery, packaging the data into a corresponding communication protocol format, and then sending the data to the whole vehicle controller through communication connection. After the whole vehicle controller receives the data sent by the second BMS system, the data can be analyzed and processed, and the required voltage value of the high-voltage battery can be extracted.
And 306, controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current, and stopping the precharge process of the high-voltage battery until the high-voltage battery meets the high-voltage electrifying condition.
The direct current converter is a power electronic device and is used for converting input direct current electric energy into direct current electric energy with controllable voltage or current required by the precharge of the high-voltage battery.
In some embodiments, as shown in fig. 1, the dc converter includes a control unit and a power unit, wherein the control unit generates appropriate control signals to control the operation of the power unit by receiving instructions and feedback signals from the vehicle controller according to a predetermined control strategy and algorithm; the control unit comprises a control chip and a related matching circuit, and is formed by constructing the control chip and the related matching circuit, and sends corresponding instructions to control the power module to be turned on or turned off according to signals uploaded by the whole vehicle controller, the motor controller, the first BMS system and the battery sensor in real time and a certain logic time sequence. The power unit receives the electric energy output by the low-voltage battery and converts the electric energy into a required output electric energy form; the power unit comprises a certain number of switching tubes, the switching tubes are built according to the corresponding circuit topology principle, and the function of converting low-voltage direct-current voltage into high-voltage direct-current voltage can be realized.
The high voltage condition refers to that the voltage of the bus capacitor of the motor controller is close to the actual voltage of the high-voltage battery. Specifically, the vehicle controller transmits the calculated current safe pre-charging current to a control unit of the direct-current converter, the control unit generates a control instruction according to a preset control strategy and algorithm, and transmits the control instruction to a power unit of the direct-current converter, and the control power unit charges a bus capacitor of the motor controller according to the current safe pre-charging current; in the process, the whole vehicle controller collects information such as the voltage of the high-voltage battery through the second BMS system, if the bus capacitor of the motor controller is close to the voltage of the high-voltage battery, the high-voltage battery is judged to meet the high-voltage charging condition, the whole vehicle controller controls the direct-current converter to stop working, and the pre-charging process of the high-voltage battery is also stopped.
According to the high-voltage battery pre-charging method, the state and the working condition of the low-voltage battery can be accurately known by acquiring the real-time working condition data of the high-voltage battery, so that the low-voltage battery is ensured to be not excessively charged or discharged in the charging process, and the high-voltage battery is prevented from being damaged or hidden danger is avoided. Meanwhile, based on real-time working condition data of the low-voltage battery, the safe charging current of the pre-charging is determined, and based on the voltage condition of the low-voltage battery, the pre-charging process can be dynamically regulated and controlled in real time, so that the discharging capacity of the low-voltage battery and the balance of the high-voltage pre-charging time are realized, the charging process is ensured to be carried out within the bearable range of the high-voltage battery, the problem of pre-charging failure caused by abnormality of the high-voltage battery is avoided, and the success of the high-voltage pre-charging under various working conditions is ensured.
In one embodiment, the real-time operating condition data includes real-time temperature and real-time state of charge; determining a current safe precharge current of the high voltage battery based on the real-time operating condition data, comprising:
acquiring the association relation between the temperature, the state of charge and the safe discharge current of the low-voltage battery; based on the association relation, determining the maximum safe discharge current corresponding to the real-time temperature and the real-time state of charge, and taking the maximum safe discharge current as the current safe pre-charging current of the high-voltage battery.
The state of charge (SOC), which is a ratio of the remaining capacity of a low-voltage battery to the capacity of its fully charged state, is often expressed as a percentage. Map information of the state of charge (SOC) refers to a data map of the correspondence between the state of charge (SOC) of the low-voltage battery and parameters such as temperature, voltage, etc. This mapping can be used to determine the maximum safe discharge current of the battery under different temperature and voltage conditions.
The association relation can be fitted by a large amount of data, a mathematical model can be trained based on the existing data set by using statistical learning or machine learning and the like, the mathematical model takes the temperature and the state of charge of the low-voltage battery as input and the safe discharge current of the low-voltage battery as output, and the mathematical model can describe the relation between the temperature and the state of charge of the low-voltage battery and the safe discharge current of the low-voltage battery and generate a corresponding relation curve.
Specifically, the vehicle controller collects map information of real-time temperature T and real-time state of charge SOC of the low-voltage battery according to a first BMS system of the low-voltage battery, determines maximum discharge current of the low-voltage battery corresponding to the real-time temperature and the real-time state of charge based on a preset association relation, and takes the maximum safe discharge current as current safe pre-charge current of a bus capacitor of the motor controller.
In this embodiment, by comprehensively considering a plurality of factors such as temperature and state of charge, the safe charging current in the pre-charging process can be more accurately determined, and dangerous situations such as overcharging and overheating of the battery can be avoided, so that the use safety of the battery is improved, the pre-charging state is adjusted according to the real-time temperature and the real-time state of charge, the balance of the discharging capacity of the low-voltage battery and the high-voltage pre-charging time is realized, the service life of the low-voltage battery is ensured, and the success of high-voltage pre-charging under various working conditions is ensured.
In one embodiment, the high voltage battery pre-charge method further comprises:
determining the minimum discharge voltage of the high-voltage battery based on real-time working condition data in the pre-charging process of the high-voltage battery; detecting the real-time voltage of the low-voltage battery; and if the real-time voltage is less than or equal to the minimum discharge voltage, stopping the pre-charging process of the high-voltage battery.
In some embodiments, if the real-time voltage is greater than the minimum discharge voltage, the step of controlling the dc converter to precharge the high voltage battery according to the current safe precharge current is continued.
The minimum discharge voltage of the low-voltage battery refers to the minimum voltage value to which the low-voltage battery is allowed to discharge in the normal working process. The minimum discharge voltage of the low-voltage battery is dynamically adjusted according to the real-time working condition data of the low-voltage battery, and the specific adjustment method can be different according to the battery type and different application scenes. For example, at lower temperatures, the discharge capability of the low voltage battery may decrease, and thus the minimum discharge voltage of the low voltage battery may increase accordingly to prevent overdischarge of the battery. Typically, the minimum discharge voltage of a 12V low voltage battery is typically 10.5V.
The real-time voltage is less than or equal to the minimum discharge voltage, and represents that the low-voltage battery has been discharged below its safety limit, at which time the battery may be in an overdischarge state, in which case, to ensure the safety of the low-voltage battery, the process of charging the high-voltage battery with the output low-voltage power of the low-voltage battery, that is, the precharge process of the high-voltage battery, is stopped.
Specifically, fig. 4 is a control flow chart of a high-voltage battery pre-charging method in one embodiment, as shown in fig. 4, the vehicle controller determines the maximum discharging current of the low-voltage battery according to the real-time temperature T and the map information of the real-time state of charge SOC of the low-voltage battery collected by the first BMS system of the low-voltage battery, and uses the maximum discharging current as the current safe pre-charging current I target The method comprises the steps of carrying out a first treatment on the surface of the The whole vehicle controller sends a pre-charging enable and the current safe pre-charging current I of the high-voltage battery to the direct-current converter target The direct current converter pre-charges the current I according to the current safety target Entering a pre-charging working mode to charge a bus capacitor of the motor controller; based on the real-time working condition data, the vehicle controller utilizes a preset algorithm or model to determine the minimum discharge voltage V2 of the low-voltage battery under the current condition, and continuously detects the real-time voltage V1 of the low-voltage battery, and compares the real-time voltage V1 with the minimum discharge voltage V2. If the real-time voltage V1 is greater than the minimum discharge voltage V2, the DC converter pre-charges the current I according to the current safety target The pre-charging working mode is continued until the high-voltage battery meets the high-voltage charging condition; if the real-time voltage V1 is smaller than or equal to the minimum discharge voltage V2, the whole vehicle controller sends an enabling to inhibit pre-charging to the direct current converter, the direct current converter exits from the pre-charging working mode, and the pre-charging process of the high-voltage battery is stopped.
In this embodiment, by monitoring the real-time voltage of the low-voltage battery and comparing the real-time voltage with the minimum discharge voltage, the pre-charging process of the high-voltage battery is stopped under the condition that the real-time voltage is less than or equal to the minimum discharge voltage, so that the problem of pre-charging failure of the high-voltage battery caused by heavy current charging generated by over-discharging of the lithium battery can be avoided.
In one embodiment, the real-time operating condition data includes a real-time state of charge, and the high voltage battery pre-charge method further includes:
and if the real-time state of charge is greater than the preset state of charge, executing the step of determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data.
In some embodiments, if the real-time state of charge is less than or equal to the preset state of charge, the pre-charging process of the high voltage battery is stopped.
The preset state of charge refers to a minimum state of charge that can be reached by the low-voltage battery in a discharging process, and represents a minimum threshold value of the electric quantity of the low-voltage battery in discharging, and when the state of charge of the low-voltage battery is reduced to the threshold value, the discharging process may be stopped or limited.
If the real-time charge state is larger than the preset charge state, the current low-voltage battery is characterized in that the electric quantity is more, and discharging can be performed; if the real-time charge state is smaller than or equal to the preset charge state, the electric quantity of the current low-voltage battery is smaller, and discharging cannot be performed.
Specifically, after the vehicle controller acquires the real-time working condition data of the low-voltage battery, the real-time state of charge is extracted from the real-time working condition data, the real-time state of charge is compared with the preset state of charge, if the real-time state of charge is larger than the preset state of charge, the current low-voltage battery is characterized in that more electric quantity can be obtained, the discharging can be carried out,
in this embodiment, discharging is started only when the real-time state of charge of the low-voltage battery is greater than the preset state of charge, so that the problem of high-voltage battery pre-charging failure caused by overdischarge of the low-voltage battery when the electric quantity is low can be avoided.
In one detailed embodiment, the high voltage battery pre-charge method includes the steps of:
1. acquiring real-time working condition data of a low-voltage battery;
2. if the real-time charge state is larger than the preset charge state, executing the next step; and if the real-time charge state is smaller than or equal to the preset charge state, executing the step nine.
3. Acquiring the association relation between the temperature, the state of charge and the safe discharge current of the low-voltage battery;
4. based on the association relation, determining the maximum safe discharge current corresponding to the real-time temperature and the real-time state of charge, and taking the maximum safe discharge current as the current safe pre-charging current of the high-voltage battery.
5. And controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current, and stopping the precharge process of the high-voltage battery until the high-voltage battery meets the high-voltage electrifying condition.
6. Determining the minimum discharge voltage of the high-voltage battery based on real-time working condition data in the pre-charging process of the high-voltage battery;
7. detecting the real-time voltage of the low-voltage battery;
8. if the real-time voltage is less than or equal to the minimum discharge voltage, executing the step nine; if the real-time voltage is greater than the minimum discharge voltage, step ten is performed.
9. The precharge process of the high-voltage battery is stopped.
10. And continuing to execute the step of controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current.
In this embodiment, the relationship curve between the temperature T and the SOC of the lithium battery is uploaded to the vehicle controller, and the vehicle controller determines the maximum discharge current of the low-voltage battery as the safe charging current according to the real-time working condition data of the low-voltage battery, so as to control the pre-charging state of the dc converter, and avoid the pre-charging failure caused by the high-current charging in the over-discharging state of the low-voltage battery. Meanwhile, the real-time voltage state of the low-voltage battery can be monitored in real time in the pre-charging process to realize real-time regulation and control of the pre-charging, so that the service life of the low-voltage battery is ensured, and the success of the high-voltage pre-charging under various working conditions is ensured.
It should be understood that, although the steps in the flowcharts related to the embodiments described above 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 embodiment of the application also provides a high-voltage battery pre-charging device for realizing the high-voltage battery pre-charging method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation of the embodiment of the high-voltage battery pre-charging device or embodiments provided below may be referred to the limitation of the high-voltage battery pre-charging method hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 5, there is provided a high voltage battery pre-charging apparatus comprising:
the acquisition module 501 is used for acquiring real-time working condition data of the battery;
the determining module 502 is configured to determine a current safe precharge current of the high-voltage battery based on the real-time working condition data;
and the pre-charging module 503 is configured to control the dc converter to pre-charge the high-voltage battery according to the current safe pre-charging current, until the high-voltage battery meets the high-voltage charging condition, and stop the pre-charging process of the high-voltage battery.
In one embodiment, the real-time operating condition data includes real-time temperature and real-time state of charge; the determining module 502 is further configured to obtain a correlation between the temperature, the state of charge, and a safe discharge current of the low-voltage battery; based on the association relation, determining the maximum safe discharge current corresponding to the real-time temperature and the real-time state of charge, and taking the maximum safe discharge current as the current safe pre-charging current of the high-voltage battery.
In one embodiment, the pre-charging module 503 is further configured to determine, during the pre-charging of the high-voltage battery, a minimum discharge voltage of the high-voltage battery based on the real-time operating condition data; detecting the real-time voltage of the low-voltage battery; and if the real-time voltage is less than or equal to the minimum discharge voltage, stopping the pre-charging process of the high-voltage battery.
In one embodiment, the pre-charging module 503 is further configured to continuously perform the step of controlling the dc converter to pre-charge the high voltage battery according to the current safe pre-charging current if the real-time voltage is greater than the minimum discharging voltage.
In one embodiment, the real-time operating condition data includes a real-time state of charge, and the determining module 502 is further configured to perform the step of determining a current safe precharge current of the high voltage battery based on the real-time operating condition data if the real-time state of charge is greater than a preset state of charge.
In one embodiment, the determining module 502 is further configured to stop the pre-charging process of the high voltage battery if the real-time state of charge is less than or equal to a preset state of charge.
The modules in the high-voltage battery pre-charging device can be all or partially realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor implements a high voltage battery pre-charge method. The display unit of the computer equipment is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device, wherein the display screen can be a liquid crystal display screen or an electronic ink display screen, the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on a shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 6 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including, but not limited to, user equipment information, user personal information, etc.) and the data (including, but not limited to, data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to comply with the related laws and regulations and standards of the related countries and regions.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method of pre-charging a high voltage battery, the method comprising:
acquiring real-time working condition data of a low-voltage battery;
determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data;
and controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current, and stopping the precharge process of the high-voltage battery until the high-voltage battery meets the high-voltage electrifying condition.
2. The method of claim 1, wherein the real-time operating condition data comprises a real-time temperature and a real-time state of charge; the determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data comprises the following steps:
acquiring the association relation between the temperature, the state of charge and the safe discharge current of the low-voltage battery;
and based on the association relation, determining the maximum safe discharge current corresponding to the real-time temperature and the real-time state of charge, and taking the maximum safe discharge current as the current safe pre-charge current of the high-voltage battery.
3. The method according to claim 1, wherein the method further comprises:
determining a minimum discharge voltage of the low-voltage battery based on the real-time working condition data in the pre-charging process of the high-voltage battery;
detecting a real-time voltage of the low-voltage battery;
and if the real-time voltage is smaller than or equal to the minimum discharge voltage, stopping the pre-charging process of the high-voltage battery.
4. A method according to claim 3, characterized in that the method further comprises:
and if the real-time voltage is larger than the minimum discharge voltage, continuing to execute the step of controlling the direct current converter to precharge the high-voltage battery according to the current safe precharge current.
5. The method of claim 1, wherein the real-time operating condition data comprises a real-time state of charge, the method further comprising:
and if the real-time state of charge is greater than a preset state of charge, executing the step of determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data.
6. The method of claim 5, wherein the method further comprises:
and if the real-time charge state is smaller than or equal to the preset charge state, stopping the pre-charging process of the high-voltage battery.
7. A high voltage battery pre-charge device, the device comprising:
the acquisition module is used for acquiring real-time working condition data of the low-voltage battery;
the determining module is used for determining the current safe pre-charging current of the high-voltage battery based on the real-time working condition data;
and the pre-charging module is used for controlling the direct-current converter to pre-charge the high-voltage battery according to the current safe pre-charging current until the high-voltage battery meets the high-voltage charging condition, and stopping the pre-charging process of the high-voltage battery.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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| CN202311825785.1A CN117811138A (en) | 2023-12-27 | 2023-12-27 | High-voltage battery pre-charging method, apparatus, device, storage medium, and program product |
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| CN202311825785.1A CN117811138A (en) | 2023-12-27 | 2023-12-27 | High-voltage battery pre-charging method, apparatus, device, storage medium, and program product |
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