Power battery management method and system of electric well repair vehicle and electric control system

Abstract

The invention provides a power battery management method and system of an electric well repair vehicle and an electric control system. The electric workover vehicle comprises a load, a power battery and a charger, the charger is used for charging the power battery, the power battery is used for supplying power to the load, and the method comprises the following steps that the working current of the load is obtained; determining the working state of the load according to the working current, wherein the working state comprises heavy-load lifting, constant-speed operation and no-load standby; the coulombic efficiency in the ampere-hour integral method is corrected according to the working state; the SOC value of the power battery is calculated through the corrected ampere-hour integral method; and performing battery management according to the SOC value. According to the method, the working state of the load is determined based on the working current of the load, and the coulombic efficiency in the ampere-hour integral method is corrected according to the working state, so that the calculated SOC value is more accurate, the accuracy of the SOC value at low electric quantity is particularly improved, the battery management control is more accurate, and overcharge or overdischarge is avoided.

Description

Technical Field

[0001] This invention relates to the field of power battery management technology, and in particular to a power battery management method, system and electronic control system for an electric well repair vehicle. Background Technology

[0002] In recent years, electric workover trucks have become a type of workover equipment used in the oil and gas industry. Their main function is to replace traditional diesel-powered workover trucks in order to improve operational efficiency and environmental performance.

[0003] With global focus on renewable energy and clean technologies, the oil and gas industry is exploring more sustainable technological solutions. Against this backdrop, electric workover rigs have emerged as a powerful alternative to traditional workover equipment. Modern workover operations are increasingly moving towards intelligence and automation to improve operational safety and efficiency. Electric workover rigs are typically equipped with advanced control systems enabling real-time monitoring and remote operation. They use electric motors as their drive unit and can be powered by batteries, generators, or the power grid. Compared to diesel engines, electric motors offer significant advantages in energy efficiency and maintenance costs. Advances in battery technology (such as lithium-ion batteries and solid-state batteries) have improved the range and charging speed of electric workover rigs, enabling their effective use in remote areas or well sites with limited power supply.

[0004] Currently, managing and optimizing the power battery modules of electric well-workover trucks is a challenge. It's necessary to ensure energy is available when needed while avoiding overcharging or over-discharging. This places high demands on the control system. Typically, the ampere-hour integral method is used to calculate the State of Charge (SOC) value for battery charging and discharging management. However, when applied to electric well-workover trucks, this universal method has certain biases, leading to inaccurate battery management. These problems urgently need to be addressed. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention provides a method, system, and electronic control system for managing the power battery of an electric well repair vehicle.

[0006] In a first aspect, the present invention provides a method for managing the power battery of an electric well-workover vehicle, the electric well-workover vehicle comprising a load, a power battery, and a charger, the charger being used to charge the power battery, and the power battery being used to supply power to the load, the method comprising the following steps: Obtain the operating current of the load; The operating state of the load is determined based on the operating current, and the operating state includes heavy-load lifting, constant-speed operation, and no-load standby. The coulomb efficiency in the ampere-hour integration method is corrected based on the aforementioned operating state; The SOC value of the power battery is calculated using the modified ampere-hour integration method; Battery management is performed based on the stated SOC value.

[0007] In the electric well-working vehicle power battery management method of the present invention, the peak current of the working current during heavy-load lifting is 200-300A, and the coulombic efficiency coefficient is 0.91-0.94; the peak current of the working current during uniform-speed operation is 50-100A, and the coulombic efficiency coefficient is 0.95-0.97; the peak current of the working current during no-load standby is less than 10A, and the coulombic efficiency coefficient is 0.98-0.99.

[0008] The electric well-servicing vehicle power battery management method of the present invention further includes acquiring the real-time charging voltage of the charger; When the real-time charging voltage is in the constant voltage charging stage, the charging endpoint is determined by the SOC value of the power battery.

[0009] The electric well-servicing vehicle power battery management method of the present invention further includes obtaining the voltage drop value, current value and SOH value of the power battery when the load is started under heavy load; Establish the correspondence between the internal resistance value of the power battery and the SOH value; The internal resistance of the power battery is calculated based on the voltage drop value and the current value, and the SOH value of the power battery is determined based on the internal resistance and the corresponding relationship.

[0010] In a second aspect, the present invention also provides a battery management system for an electric well-servicing vehicle, comprising: The acquisition module is used to acquire the operating current of the load; The confirmation module is used to determine the working state of the load based on the working current, and the working state includes heavy-load lifting, constant-speed operation and no-load standby. The correction module is used to correct the Coulomb efficiency coefficient in the ampere-hour integration method according to the working state. A calculation module is used to calculate the SOC value of the power battery using the modified ampere-hour integration method; A management module for managing the battery based on the SOC value.

[0011] In a third aspect, the present invention also provides an electric control system for an electric well-servicing vehicle, which includes the battery management system described above.

[0012] The electric well-working vehicle control system of the present invention also includes an electrical control module, a power battery module, a charging module, a VVVF power unit, and a thermal management module. The electrical control module is electrically connected to the power battery module, the battery management system, the charging module, the VVVF power unit, and the thermal management module, respectively. It is used to acquire the operating data of each module and control the operation of each module based on the operating data. The operating data includes the operating parameters, alarm signals, and control signals of each module. The battery management system is used to monitor the voltage, current, and temperature of the power battery module, and to calculate the SOC value and the SOH value. The thermal management module is used to perform thermal management on the power battery module, the charging module and the VVVF power unit to prevent overheating; The VVVF power unit is electrically connected to the power battery module, the battery management system, the charging module and the thermal management module, and is used to reduce power operation or block output and disconnect load when the operating parameters are abnormal. The charging module is used to charge the power battery module; The power battery module is used to supply power to the electric well repair vehicle.

[0013] In the electric well-working vehicle control system of the present invention, the thermal management module is in the form of two modules, thereby achieving redundancy.

[0014] The electric well-servicing vehicle control system of the present invention also includes a host computer management system; The host computer management system is electrically connected to the electrical control module and is used to acquire the operating data and issue control commands to the electrical control module based on the operating data.

[0015] The electric well-servicing vehicle control system of the present invention also includes a remote management system; The remote management system is connected to the electrical control module via the Internet of Things (IoT) to acquire the operating data, perform fault diagnosis based on the operating data, and send maintenance reminders according to the maintenance cycle time nodes.

[0016] The effects of this invention are as follows: The electric well-working vehicle power battery management method of this application is based on determining the working state of the load by the working current of the load, and correcting the coulombic efficiency in the ampere-hour integral method according to the working state, so that the calculated SOC value is more accurate, especially improving the accuracy of the SOC value when the battery is low (SOC value is less than 25%), making the battery management control more accurate and avoiding overcharging or over-discharging. Attached Figure Description

[0017] Figure 1 This is one of the flowcharts for a power battery management method for an electric well repair vehicle according to the present invention; Figure 2This is a second flowchart of a power battery management method for an electric well repair vehicle according to the present invention; Figure 3 This is the third flowchart of a power battery management method for an electric well repair vehicle according to the present invention; Figure 4 This is a schematic diagram of the electrical control system of an electric well-servicing vehicle according to the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] The following detailed description, with reference to the accompanying drawings, illustrates a power battery management method, system, and electronic control system for an electric well-servicing vehicle according to the present invention.

[0022] Example 1 This embodiment provides a method for managing the power battery of an electric well-workover vehicle. The electric well-workover vehicle includes a load, a power battery, and a charger. The charger is used to charge the power battery, and the power battery is used to supply power to the load. The method includes the following steps: Obtain the operating current of the load; The operating state of the load is determined based on the operating current. The operating states include heavy-load lifting, constant-speed operation, and no-load standby. Adjust the coulomb efficiency in the ampere-hour integral method according to the working conditions; The SOC value of the power battery is calculated using the modified ampere-hour integration method; Battery management is based on SOC value; that is, when the SOC value is less than 20%, a low battery warning is triggered.

[0023] The present invention discloses a power battery management method for an electric well repair vehicle. The method determines the working state of the load based on the working current of the load and corrects the coulombic efficiency in the ampere-hour integration method according to the working state. This reduces the impact of current fluctuations on the calculation results of the ampere-hour integration method, making the calculated SOC value more accurate. In particular, it improves the accuracy of the SOC value when the battery is low (SOC value is less than 25%), making the battery management control more accurate and avoiding overcharging or over-discharging.

[0024] In some preferred embodiments, the peak current during heavy-load lifting is 200-300A, with a Coulomb efficiency coefficient of 0.91-0.94; the peak current during constant-speed operation is 50-100A, with a Coulomb efficiency coefficient of 0.95-0.97; and the peak current during no-load standby is less than 10A, with a Coulomb efficiency coefficient of 0.98-0.99. That is, corresponding Coulomb efficiency coefficients are assigned to different operating states. When the load (the main drive motor of the electric well-working vehicle) is in the corresponding operating state, the Coulomb efficiency coefficient in the ampere-hour integration method is replaced with the corresponding replacement value. This makes the current more consistent with the operating characteristics of the electric well-working vehicle, resulting in a more accurate SOC value calculation with an error ≤3%.

[0025] In some preferred embodiments, the method also includes acquiring the real-time charging voltage of the charger; When the real-time charging voltage is in the constant voltage charging stage, the charging endpoint is determined by the SOC value of the power battery. This makes the control of the power battery charging and discharging process more accurate, avoiding erroneous control due to SOC value calculation deviation, which would affect the normal operation of the electric well repair truck.

[0026] Preferably, the constant voltage charging stage has a charging voltage of 550±5V.

[0027] In some preferred embodiments, Among them, SOC 初 Let i be the initial value, i be the current at time t, t be time, and C be the nominal capacity. Coulomb efficiency is defined as the Coulomb efficiency coefficient, which is introduced to correct the Coulomb efficiency. The corrected Coulomb efficiency is equal to the Coulomb efficiency coefficient multiplied by the original Coulomb efficiency.

[0028] In some preferred embodiments, the method also includes obtaining the voltage drop, current, and SOH value of the power battery during heavy load startup. Establish a correspondence between the internal resistance and SOH value of the power battery; The internal resistance of the power battery is calculated based on voltage drop and current values, and the state of equilibrium (SOH) value is determined based on the internal resistance and its corresponding relationship. This allows for dynamic updating of the SOH value; for example, the internal resistance value is calculated every 15 charge cycles, and then the corresponding SOH value is obtained based on the relationship, enabling dynamic updating. Based on SOH estimation, battery performance degradation (SOH < 86%) can be identified 60 working cycles in advance, providing a basis for battery maintenance and replacement, and reducing the risk of well workover operation interruptions. Specifically, the capacity decay rate SOH = actual capacity / rated capacity × 100%, where actual capacity = total charging capacity / (charging termination voltage - discharge cutoff voltage) × depth of discharge; in practical applications, the SOH value is obtained through the management system built into the purchased power battery.

[0029] Specifically, the internal resistance is calculated using the formula ΔU=I×R, where ΔU is the voltage drop value, I is the current when the load is under heavy load and the corresponding SOH value of the power battery is obtained during the calculation to obtain the corresponding relationship.

[0030] Example 2 This embodiment provides a battery management system for an electric well-servicing vehicle, which includes: The acquisition module is used to acquire the operating current of the load; The confirmation module is used to determine the working status of the load based on the working current. The working status includes heavy-load lifting, constant speed operation and no-load standby. The correction module is used to correct the coulomb efficiency in the ampere-hour integration method according to the working status. The calculation module is used to calculate the SOC value of the power battery using the modified ampere-hour integration method; The management module is used for battery management based on SOC values.

[0031] The system of the present invention determines the operating state of the load based on the operating current of the load, and corrects the coulombic efficiency in the ampere-hour integration method according to the operating state, reducing the impact of current fluctuations on the calculation results of the ampere-hour integration method, making the calculated SOC value more accurate, especially improving the accuracy of the SOC value when the battery is low (SOC value is less than 25%), making battery management control more accurate and avoiding overcharging or over-discharging.

[0032] In some preferred embodiments, the battery management system (BMS) can also acquire the temperature of the power battery and control the power battery to operate or not operate based on the temperature value in order to avoid overheating.

[0033] Example 3 This embodiment provides an electric control system for an electric well-servicing vehicle, which includes the battery management system of Embodiment 2 above.

[0034] In some preferred embodiments, it also includes an electrical control module, a power battery module, a charging module, a VVVF power unit, and a thermal management module; The electrical control module is electrically connected to the power battery module, battery management system, charging module, VVVF power unit and thermal management module respectively. It is used to acquire the operating data of each module and control the operation of each module based on the operating data. Specifically, it performs logical operations to control the operation of the power system motor, the high voltage power-on and power-off of the vehicle, and various auxiliary equipment.

[0035] Once the electrical control module receives the corresponding action command from the workover vehicle, the VVVF power unit drives the main drive motor to run (performing torque and speed control). This is mainly based on controlling the operating current, voltage, and speed signals of the main drive motor to achieve torque and speed control.

[0036] Auxiliary equipment control includes current detection of the corresponding auxiliary motor, as well as temperature and pressure of the cooling medium; temperature monitoring of each power unit and motor; voltage, current, and operating temperature monitoring of the charging module and battery module, etc. When the above parameters exceed the limit range, corresponding control is performed. The specific control scheme can be determined according to the working conditions and is not limited here.

[0037] The operational data includes the operating parameters, alarm signals, and control signals of each module; The battery management system is used to monitor the voltage, current, and temperature of the power battery module, and calculate the SOC and SOH values. The electrical control module controls the charging module based on the detection values ​​of the battery management system to avoid overcharging, over-discharging, or overheating, and can realize on-load charging and discharging management.

[0038] The thermal management module is used to manage the thermal of the power battery module, charging module and VVVF power unit. That is, it controls the temperature of the coolant in the cooling system through heat exchange, thereby controlling the temperature of each module and preventing overheating. The VVVF power unit is electrically connected to the power battery module, battery management system, charging module, and thermal management module. It is used to handle abnormal operating parameters. Specifically, these parameters can include the host heartbeat signal, operating voltage, operating current, and operating temperature of each module or system; coolant flow rate and temperature; and the remaining charge (SOC) and state of health (SOH) of the power battery module. When these values ​​reach preset thresholds, the power output is reduced or the output is blocked, and the load is disconnected. This improves the response speed and protection functions of the entire electric well-working vehicle's electronic control system. Specifically, the VVVF power unit is used to control the speed and torque of the load (power motor).

[0039] The charging module is used to charge the power battery module; The power battery module is used to supply power to the electric well-working vehicle.

[0040] In some preferred embodiments, the number of thermal management modules is two, thus achieving redundancy. That is, redundant thermal management modules are set up, one as the primary and one as the backup, which can also be called one active and one standby. The standby unit is always in a hot standby state. When one thermal management module fails, the redundant thermal management module can quickly take over to ensure that the power battery module can operate at the rated constant temperature in extremely cold and hot environments.

[0041] In some preferred embodiments, a host computer management system is also included; the host computer management system is electrically connected to the electrical control module and is used to acquire operating data and issue control commands to the electrical control module based on the operating data, the specific command content being determined according to the working conditions or requirements; and to realize human-machine interaction with the operator.

[0042] In some preferred embodiments, a remote management system is also included; the remote management system is connected to the electrical control module via the Internet of Things to acquire operating data and perform fault diagnosis based on the operating data. The specific fault diagnosis method can refer to existing technologies, and maintenance reminder information is sent according to the maintenance cycle time nodes to realize the full life cycle management of the electric well repair truck's electrical control system.

Claims

1. A power battery management method for an electric workover rig, the electric workover rig comprising a load, a power battery and a charger, the charger being configured to charge the power battery, the power battery being configured to supply power to the load, the method comprising: The method comprises the following steps: ​ acquiring the working current of the load; determining the working state of the load according to the working current, wherein the working state comprises heavy load lifting, uniform speed operation and no-load standby; correcting the coulomb efficiency in ampere-hour integration method according to the working state; calculating the SOC value of the power battery by using the corrected ampere-hour integration method; carrying out battery management by using the SOC value.

2. The electric workover unit power battery management method of claim 1, wherein, The current peak value of the working current during the heavy load lifting is 200-300 A, and the coulomb efficiency coefficient is 0.91-0.94; the current peak value of the working current during the uniform speed operation is 50-100 A, and the coulomb efficiency coefficient is 0.95-0.97; the current peak value of the working current during the no-load standby is less than 10 A, and the coulomb efficiency coefficient is 0.98-0.

99.

3. The electric workover unit power battery management method of claim 1, wherein, Further comprising acquiring the real-time charging voltage of the charger; when the real-time charging voltage is in the constant voltage charging stage, judging the charging end point by using the SOC value of the power battery.

4. The electric workover unit power battery management method of claim 1, wherein, Further comprising acquiring the voltage drop value, current value and SOH value of the power battery when the load is started under heavy load; establishing the corresponding relationship between the internal resistance value of the power battery and the SOH value; calculating the internal resistance of the power battery according to the voltage drop value and the current value, and determining the SOH value of the power battery according to the internal resistance and the corresponding relationship.

5. A battery management system for an electric workover rig, the system comprising: comprise: an acquiring module for acquiring the working current of the load; a confirming module for determining the working state of the load according to the working current, wherein the working state comprises heavy load lifting, uniform speed operation and no-load standby; a correcting module for correcting the coulomb efficiency coefficient in ampere-hour integration method according to the working state; a calculating module for calculating the SOC value of the power battery by using the corrected ampere-hour integration method; a management module for carrying out battery management by using the SOC value.

6. An electrically controlled system for an electric workover rig, characterized in that, comprise the battery management system in claim 5.

7. The electric control system of the electric workover rig according to claim 6, characterized in that, further comprise an electrical control module, a power battery module, a charging module, a VVVF power unit and a thermal management module; the electrical control module is electrically connected with the power battery module, the battery management system, the charging module, the VVVF power unit and the thermal management module respectively, and is used for acquiring the running data of each module and controlling the running of each module according to the running data, wherein the running data comprises the running parameters, alarm signals and control signals of each module; the battery management system is used for monitoring the voltage, current and temperature of the power battery module, and calculating the SOC value and the SOH value; the thermal management module is used for carrying out thermal management on the power battery module, the charging module and the VVVF power unit, so as to avoid over-temperature; the VVVF power unit is electrically connected with the power battery module, the battery management system, the charging module and the thermal management module, and is used for reducing the power operation or blocking the output and cutting off the load when the running parameters are abnormal; the charging module is used for charging the power battery module; the power battery module is used for supplying power to the electric well repair vehicle.

8. The electric workover rig electric control system of claim 7, wherein, the number of the thermal management modules is 2, so that redundancy setting is realized.

9. The electric workover rig electric control system of claim 7, wherein, Further comprising a host computer management system; The host computer management system is electrically connected to the electrical control module, used for acquiring the operation data and issuing control instructions to the electrical control module according to the operation data.

10. The electric workover rig electric control system of claim 7, wherein, Further comprising a remote management system; The remote management system is connected to the electrical control module through the Internet of Things, used for acquiring the operation data, performing fault diagnosis according to the operation data, and sending maintenance prompt information according to the maintenance and repair cycle time node.

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