CN115723628A - Energy recovery based overvoltage control method, system, device and medium - Google Patents
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- 238000011084 recovery Methods 0.000 title claims abstract description 40
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 4
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present application provides energy recovery based overvoltage control methods, systems, devices, and media, the method comprising: acquiring a first voltage of a single battery, if the first voltage is continuously greater than a preset first threshold value, acquiring a first state parameter of the battery, and determining a first maximum charging power currently allowed by the battery according to the first state parameter; limiting the first maximum charging power, and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate. According to the method and the device, the speed of the power limiting value is reduced through the first filtering speed, and the irregularity of vehicle driving caused by the large change of the charging power is prevented.
Description
Technical Field
The present application relates to the field of electric vehicle applications, and more particularly, to energy recovery based overvoltage control methods, systems, devices, and media.
Background
Because the lithium iron phosphate battery has lower cost advantage and longer service life than the mainstream ternary lithium battery, the lithium iron phosphate battery has higher and higher proportion as a power supply of an electric automobile in recent years. However, because the voltage of the lithium iron phosphate battery has a long platform area, the SOC accuracy cannot be accurately controlled, so if the actual electric quantity of the battery is high and the battery SOC estimated by the battery management system software is low, the charging power calculated by table lookup will be high and exceed the actual capacity of the battery, and if the vehicle is in long-time energy recovery, the performance of the battery and the vehicle will be greatly influenced if the vehicle cannot be effectively controlled.
The prior art (CN 114940084A) discloses an electric vehicle intelligent charging control system, method and medium with vehicle cloud coordination, which establish a cloud simulation environment through a digital twin to further optimize and manage a charging point. The cost of building the platform in such a mode is high, an effective charging overvoltage prevention strategy is not provided, and the use requirement of the vehicle is difficult to meet.
Disclosure of Invention
In view of the problems in the prior art, the application provides an overvoltage control method, system, device and medium based on energy recovery, and mainly solves the problem that the performance of a battery and a vehicle is influenced due to the fact that the charging power of the existing battery is estimated to be higher.
In order to achieve the above and other objects, the present application adopts the following technical solutions.
The application provides an energy recovery based overvoltage control method, comprising:
acquiring a first voltage of a single battery, if the first voltage is continuously greater than a preset first threshold value, acquiring a first state parameter of the battery, and determining a first maximum charging power currently allowed by the battery according to the first state parameter;
limiting the first maximum charging power, and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate.
In an embodiment of the present application, before determining the first maximum charging power currently allowed by the battery according to the first state parameter, the method includes:
and constructing a mapping relation table between the battery state parameters and the maximum charging power so as to determine the maximum charging power corresponding to the battery state parameters at different moments by contrasting the mapping relation table.
In an embodiment of the present application, after limiting the first maximum charging power, the limiting includes:
acquiring a second voltage of the battery monomer, if the second voltage is continuously greater than a preset second threshold value, acquiring a second state parameter of the battery, and determining a second maximum charging power currently allowed by the battery according to the second state parameter, wherein the second threshold value is greater than the first threshold value;
and limiting the second maximum charging power, and reducing the second maximum charging power to a second target charging power after the second maximum charging power is limited according to a preset second filtering rate.
In an embodiment of the present application, after limiting the second maximum charging power, the method further includes:
acquiring a third voltage of the battery cell, if the third high voltage is continuously greater than a preset third threshold value, acquiring a third state parameter of the battery, and determining a third maximum charging power currently allowed by the battery according to the third state parameter, wherein the third threshold value is greater than the second threshold value;
limiting the third maximum charging power, and immediately reducing the third maximum charging power to a third target charging power after the third maximum charging power is limited.
In an embodiment of the present application, the third target charging power is zero.
In an embodiment of the present application, the second filtering rate is greater than the first filtering rate.
In an embodiment of the present application, if the maximum voltage of the battery cell is less than a preset fourth threshold within a preset time period, a fourth target charging power is determined according to the battery state parameter of the corresponding time node, and the real-time charging power of the battery is increased to the low-speed target charging power according to a preset gradient, where the fourth threshold is less than the first threshold.
The present application further provides an overvoltage control system based on energy recovery, comprising:
the maximum charging power determining module is used for obtaining a first voltage of a single battery, obtaining a first state parameter of the battery if the first voltage is continuously greater than a preset first threshold value, and determining a first maximum charging power currently allowed by the battery according to the first state parameter;
and the charging power adjusting module is used for limiting the first maximum charging power and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate.
The present application further provides a computer device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the energy recovery based overvoltage control method when executing the computer program.
The present application further provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the energy recovery based overvoltage control method.
As described above, the overvoltage control method, system, device and medium based on energy recovery of the present application have the following advantageous effects.
The method includes the steps that a first voltage of a single battery is obtained, if the first voltage is continuously larger than a preset first threshold value, a first state parameter of the battery is obtained, and a first maximum charging power allowed by the battery at present is determined according to the first state parameter; and limiting the first maximum charging power, and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate. The charging power is limited to avoid the situation that the charging power exceeds the range of the battery capacity too high, the stability and the reliability of the battery are guaranteed, the rate of the power limit value is reduced through the first filtering rate, and the irregularity of vehicle driving caused by the large change of the charging power is prevented.
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Fig. 1 is a schematic flow chart of an energy recovery-based overvoltage control method according to an embodiment of the present disclosure.
Fig. 2 is a schematic control flow diagram illustrating an over-voltage fault reporting during energy recovery of battery driving in an embodiment of the present application.
Fig. 3 is a block diagram of an energy recovery based overvoltage control system according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
If the vehicle is in long-time energy recovery, if the charging power cannot be effectively controlled, the following problems occur:
1. the battery core of the battery is charged above the charge cut-off voltage, which can cause the damage of the battery core for a long time;
2. after triggering the too high protection threshold of monomer voltage or total voltage that battery management system set for, lead to the charge-discharge power of battery all to receive the restriction, the vehicle can appear dynamic property not enough, the unsmooth scheduling problem of driving sense for driving experience variation even the incident appears.
In order to solve the problem, part of manufacturers limit the charging power of the high-end SOC of the battery to be smaller, when the vehicle is in energy recovery, the current charged into the battery is smaller, and the risk of battery overvoltage is reduced.
The application provides a control method capable of effectively preventing an overvoltage fault during running energy recovery of a lithium iron phosphate battery, namely when the highest monomer voltage of the battery is higher than the voltage of a platform area, charging power obtained by checking a table of a current SOC is limited in a certain proportion. According to the method, a plurality of voltage thresholds higher than a voltage platform area are set, different voltage thresholds have certain difference values, when the highest cell voltage of the battery reaches each level of voltage threshold, charging power limitation of different proportions is carried out, different power reduction filtering rates can be set, the charging power is reduced to 0 before the highest cell voltage of the battery reaches a charging overvoltage threshold, and the problem of overvoltage of all cells of the battery cannot occur. And setting a voltage threshold value for recovering the charging power, wherein all voltages of the battery can be reduced when the actual charging power is reduced, and when the highest monomer voltage is lower than the recovery threshold value, the charging power is increased according to a certain filtering rate, and the vehicle can recover energy to continue charging the battery, so that the actual electric quantity and the endurance mileage of the vehicle are ensured. The method does not need to limit the charging power of the battery with high SOC to be smaller, and avoids the problems of insufficient dynamic property, unsmooth driving feeling and the like of a vehicle caused by the limitation of the charging and discharging power.
The method of the present application is described in detail below with reference to specific examples.
Referring to fig. 1, the present application provides an energy recovery based overvoltage control method including the following steps.
Step S100, acquiring a first voltage of a battery cell, acquiring a first state parameter of the battery if the first voltage is continuously greater than a preset first threshold, and determining a first maximum charging power currently allowed by the battery according to the first state parameter.
Referring to fig. 2, fig. 2 is a schematic diagram of a control process for reporting an overvoltage fault during energy recovery of a battery in an embodiment of the present application. In an embodiment, parameters such as a current State Of Charge (SOC) Of the battery, a cell temperature, and the like may be collected. And calculating the charging power P0 of the current state of the battery according to the parameters such as the current SOC, the cell temperature and the like, wherein the P0 is the maximum allowable charging power of the current battery. If the vehicle is in an energy recovery state at this time, the electric drive system charges the battery, the voltages of all the cells (i.e., the battery cells) in the battery pack are increased at this time, and if the highest cell voltage reaches a set threshold value U1 (i.e., a first threshold value) and the duration time T1 is reached, the charging power P1 (i.e., a first maximum charging power) of the current state of the battery is calculated according to the current SOC, the battery cell temperature and other parameters.
In one embodiment, before calculating P0 and P1, a mapping table between the battery state parameter and the maximum charging power is constructed, so as to determine the maximum charging power corresponding to the battery state parameter at different times by referring to the mapping table. After state parameters such as SOC (state of charge), cell temperature and the like are obtained, the maximum charging power under the corresponding state parameters is obtained through table lookup.
Step S101, limiting the first maximum charging power, and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate.
In an embodiment, the first maximum charging power may be limited by setting a scaling factor, the maximum charging power Preal of the battery is limited to K1 × P1, and K1 should be 0 < K1 < 1, because the allowable charging power of the current battery is to be reduced, and then the voltage rise of the cell is slowed down, the charging power P1 should be slowly reduced to Preal, and the filtering rate thereof is set to V1 KW/S (i.e., the first filtering rate), so as to prevent the rough driving of the vehicle caused by the large change of the charging power.
In one embodiment, after limiting the first maximum charging power, the method includes:
acquiring a second voltage of the battery monomer, if the second voltage is continuously greater than a preset second threshold value, acquiring a second state parameter of the battery, and determining a second maximum charging power currently allowed by the battery according to the second state parameter, wherein the second threshold value is greater than the first threshold value;
and limiting the second maximum charging power, and reducing the second maximum charging power to a second target charging power after the second maximum charging power is limited according to a preset second filtering rate.
Specifically, through the first-stage power limitation, if the voltages of all the cells still continue to rise at this time, the highest cell voltage reaches a set threshold U2 (i.e., a second threshold), and when the duration T2 is reached, the charging power of the current state of the battery is calculated to be P2 (i.e., a second maximum charging power), at this time, the maximum charging power Preal of the battery is limited to K2P 2, the value of K2 should be 0 or more and K2 < 1, the allowable charging power of the current battery is further limited, the charging power P2 should be slowly reduced to Preal, the filtering rate is set to be V2 KW/S (i.e., a second filtering rate), wherein V2 should be greater than V1, and the rate of rising of the cell voltage can be speeded up and slowed down.
In an embodiment, after limiting the second maximum charging power, the method further includes:
acquiring a third voltage of the battery cell, acquiring a third state parameter of the battery if the third high voltage is continuously greater than a preset third threshold, and determining a third maximum charging power currently allowed by the battery according to the third state parameter, wherein the third threshold is greater than the second threshold;
limiting the third maximum charging power, and immediately reducing the third maximum charging power to a third target charging power after the third maximum charging power is limited.
Specifically, through the second-stage power limitation, if the voltages of all the cells still continue to rise at this time, the highest cell voltage reaches a set threshold U3 (i.e., a third threshold), and when the duration time T3 is longer than T3, the charging power corresponding to the current state parameter of the battery is calculated to be P3, at this time, the maximum charging power Preal of the battery is limited to K3 × P3, the value of K3 should be 0, which is the last-stage power limitation, the allowable charging power of the current battery should be limited to 0, and the charging power P3 should be immediately reduced to 0, so that the highest cell voltage is prevented from rising to a set overvoltage threshold U4, because the cell is damaged after an overvoltage fault is reported, the discharging power is limited, and the vehicle has problems of insufficient dynamic performance and the like.
In an embodiment, if the maximum voltage of the battery cell is less than a preset fourth threshold within a preset time period, a fourth target charging power is determined according to the battery state parameter of the corresponding time node, and the real-time charging power of the battery is increased to the low-speed target charging power according to a preset gradient, where the fourth threshold is less than the first threshold.
Specifically, for any stage of the above three-stage charging power limitation, if the highest cell voltage of the battery is less than a set threshold U (i.e., a fourth threshold), and the duration T is long, the charging power of the battery should slowly increase to the charging power P obtained by looking up a table of parameters such as the current SOC and the cell temperature, and the filtering rate of the charging power P is set to VKW/S, so that the battery recovers the current charging capability, the energy recovery power is improved, and the actual electric quantity used by the entire vehicle is increased.
The values of the U1, the U2 and the U3 are that U1 is more than U2 and less than U3, and in principle, the charging power limitation is not frequently triggered and the single voltage can be reduced before an overvoltage fault is reported. The recovery voltage threshold U should be less than U1 and should be sized to allow for less frequent or difficult recovery of the power recovery. The duration T should be greater than T1, T2, T3. The values of T1, T2 and T3 are small as much as possible to prevent charging power from being effectively limited, the value of T is large as much as possible to prevent frequent trigger of power recovery, and the values of the parameters can be determined by combining the performance of the battery cell and the driving performance of the calibration parameters in the verification process, and are not limited.
Referring to fig. 3, the present embodiment provides an energy recovery based overvoltage control system, which is used for executing the energy recovery based overvoltage control method in the foregoing method embodiment. Since the technical principle of the system embodiment is similar to that of the method embodiment, repeated description of the same technical details is omitted.
In one embodiment, an energy recovery based overvoltage control system, comprising: the maximum charging power determining module 10 is configured to obtain a first voltage of a single battery, obtain a first state parameter of the battery if the first voltage is continuously greater than a preset first threshold, and determine a first maximum charging power currently allowed by the battery according to the first state parameter; and the charging power adjusting module 11 is configured to limit the first maximum charging power, and decrease the first maximum charging power to a first target charging power after the limit is reached according to a preset first filtering rate.
In an embodiment, the system further includes a mapping table constructing module, configured to, before determining the first maximum charging power currently allowed by the battery according to the first state parameter, include: and constructing a mapping relation table between the battery state parameters and the maximum charging power so as to determine the maximum charging power corresponding to the battery state parameters at different moments by contrasting the mapping relation table.
In an embodiment, the charging power adjusting module 11 is further configured to limit the first maximum charging power, and includes: acquiring a second voltage of the battery monomer, if the second voltage is continuously greater than a preset second threshold value, acquiring a second state parameter of the battery, and determining a second maximum charging power currently allowed by the battery according to the second state parameter, wherein the second threshold value is greater than the first threshold value; and limiting the second maximum charging power, and reducing the second maximum charging power to a second target charging power after the second maximum charging power is limited according to a preset second filtering rate.
In an embodiment, the charging power adjustment module 11 is further configured to, after limiting the second maximum charging power, further include: acquiring a third voltage of the battery cell, acquiring a third state parameter of the battery if the third high voltage is continuously greater than a preset third threshold, and determining a third maximum charging power currently allowed by the battery according to the third state parameter, wherein the third threshold is greater than the second threshold; limiting the third maximum charging power, and immediately reducing the third maximum charging power to a third target charging power after the third maximum charging power is limited.
In an embodiment, the charging power adjusting module 11 is further configured to determine a fourth target charging power according to the battery state parameter of the corresponding time node if the highest voltage of the battery cell is smaller than a preset fourth threshold in a preset time period, and increase the real-time charging power of the battery to the low-speed target charging power according to a preset gradient, where the fourth threshold is smaller than the first threshold.
The embodiment of the application also provides an overvoltage control device based on energy recovery, and the device can comprise: one or more processors; and one or more machine readable media having instructions stored thereon that, when executed by the one or more processors, cause the device to perform the method of fig. 1. In practical applications, the device may be used as a terminal device, and may also be used as a server, where examples of the terminal device may include: smart phones, tablet computers, electronic book readers, MP3 (moving Picture Experts Group Audio Layer III) players, MP4 (moving Picture Experts Group Audio Layer IV) players, laptop portable computers, car-mounted computers, desktop computers, set-top boxes, smart televisions, wearable devices, and the like, and the embodiments of the present application are not limited to specific devices.
The present disclosure also provides a machine-readable medium having one or more modules (programs) stored therein, which when applied to a device, can cause the device to execute instructions (instructions) of the steps included in the energy recovery-based overvoltage control method in fig. 1 according to the present disclosure. The machine-readable medium can be any available medium that a computer can store or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
Referring to fig. 4, the present embodiment provides a device 80, and the device 80 may be a desktop device, a laptop computer, a smart phone, or the like. In detail, the device 80 comprises at least, connected by a bus 81: a memory 82 and a processor 83, wherein the memory 82 is used for storing a computer program, and the processor 83 is used for executing the computer program stored in the memory 82 to execute all or part of the steps of the method embodiments.
The above-mentioned system bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The system bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus. The communication interface is used for realizing communication between the database access device and other equipment (such as a client, a read-write library and a read-only library). The Memory may include a Random Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the present application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.
Claims (10)
1. An energy recovery based overvoltage control method is characterized by comprising the following steps:
acquiring a first voltage of a battery monomer, if the first voltage is continuously greater than a preset first threshold value, acquiring a first state parameter of the battery, and determining a first maximum charging power currently allowed by the battery according to the first state parameter;
limiting the first maximum charging power, and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate.
2. The energy recovery-based overvoltage control method according to claim 1, wherein before determining the first maximum charging power currently allowed for the battery according to the first state parameter, the method comprises:
and constructing a mapping relation table between the battery state parameters and the maximum charging power so as to determine the maximum charging power corresponding to the battery state parameters at different moments by contrasting the mapping relation table.
3. The energy recovery based overvoltage control method according to claim 1, wherein after limiting the first maximum charging power, comprising:
acquiring a second voltage of the battery cell, if the second voltage is continuously greater than a preset second threshold value, acquiring a second state parameter of the battery, and determining a second maximum charging power currently allowed by the battery according to the second state parameter, wherein the second threshold value is greater than the first threshold value;
and limiting the second maximum charging power, and reducing the second maximum charging power to a second target charging power after the second maximum charging power is limited according to a preset second filtering rate.
4. The energy recovery based overvoltage control method according to claim 3, further comprising after limiting the second maximum charging power:
acquiring a third voltage of the battery cell, if the third high voltage is continuously greater than a preset third threshold value, acquiring a third state parameter of the battery, and determining a third maximum charging power currently allowed by the battery according to the third state parameter, wherein the third threshold value is greater than the second threshold value;
and limiting the third maximum charging power, and immediately reducing the third maximum charging power to a third target charging power after the third maximum charging power is limited.
5. The energy recovery based overvoltage control method according to claim 4, wherein the third target charging power is zero.
6. The energy recovery based overvoltage control method according to claim 4, wherein said second filtering rate is greater than said first filtering rate.
7. The energy recovery-based overvoltage control method according to any one of claims 1 to 6, wherein if the maximum voltage of the battery cell is less than a preset fourth threshold value within a preset time period, a fourth target charging power is determined according to the battery state parameter of the corresponding time node, and the real-time battery charging power is increased to the low-speed target charging power according to a preset gradient, wherein the fourth threshold value is less than the first threshold value.
8. Overvoltage control system based on energy recuperation, characterized in that includes:
the maximum charging power determining module is used for acquiring a first voltage of a battery monomer, acquiring a first state parameter of the battery if the first voltage is continuously greater than a preset first threshold value, and determining a first maximum charging power currently allowed by the battery according to the first state parameter;
and the charging power adjusting module is used for limiting the first maximum charging power and reducing the first maximum charging power to a first target charging power after the first maximum charging power is limited according to a preset first filtering rate.
9. A computer device, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor realizes the steps of the energy recovery based overvoltage control method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the energy recovery based overvoltage control method according to one of claims 1 to 7.
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| WO2024199259A1 (en) * | 2023-03-28 | 2024-10-03 | 蜂巢传动系统(江苏)有限公司 | Traction battery power correction method, and vehicle and storage medium |
| WO2024222645A1 (en) * | 2023-04-28 | 2024-10-31 | 东风汽车集团股份有限公司 | Battery charging protection method and apparatus, and storage medium |
| CN118107439A (en) * | 2024-03-20 | 2024-05-31 | 深蓝汽车科技有限公司 | Feedback allowable power control method and device for power battery, vehicle and medium |
| CN118665270A (en) * | 2024-08-23 | 2024-09-20 | 宁德时代新能源科技股份有限公司 | Battery charging control method, device, electronic equipment and storage medium |
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