CN115932624A - Method, system, equipment and medium for on-line detection of direct current internal resistance of low-voltage battery for vehicle - Google Patents
Method, system, equipment and medium for on-line detection of direct current internal resistance of low-voltage battery for vehicle Download PDFInfo
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Abstract
The invention provides a method, a system, equipment and a medium for online detection of direct current internal resistance of a low-voltage battery for a vehicle, wherein the method comprises the following steps: collecting battery characteristic parameters when a battery works based on a vehicle BMS; acquiring a current difference value between the maximum discharge current and the minimum discharge current in the data window; when the current difference value is larger than a preset current threshold value, calculating the internal resistance value of the real-time battery; verifying the internal resistance value of the real-time battery, and keeping the internal resistance value of the real-time battery meeting preset verification conditions as an effective internal resistance value of the battery; continuing to calculate the effective internal resistance value of the battery in the next data window until a preset termination condition is reached, finishing the calculation of the internal resistance value of the battery, and calculating based on the internal resistance values of the effective batteries to obtain the internal resistance value of the target battery; and when the battery characteristic parameters accord with the preset interval, calculating to obtain the aging internal resistance of the battery based on the internal resistance values of the effective batteries. The on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle can improve the detection precision and the application range of the internal resistance of the battery.
Description
Technical Field
The invention relates to the technical field of battery parameter identification, in particular to an on-line detection method, system, equipment and medium for direct current internal resistance of a low-voltage battery for a vehicle.
Background
The battery internal resistance is one of the most important battery characteristic parameters of the battery, is an important parameter for representing the service life and the running state of the battery, has key significance for battery fault detection, performance prediction and residual service life prediction, and is also one of the main tasks of a battery management system for accurately detecting the battery internal resistance, particularly ohmic internal resistance.
In the prior art, when a vehicle battery is detected, firstly, an extra electrical element is needed or an energy management strategy of the whole vehicle is modified to realize a preset discharge current pulse, so that extra cost is increased; secondly, the provided online detection method for the internal resistance of the battery only performs resistance detection in a certain SOC interval and temperature range, so that a dead zone exists in fault monitoring related to the internal resistance of the battery; finally, the actual applied working condition is different from the off-line detection testing working condition, which causes the dc internal resistance value (off-line detection) obtained by using the table look-up method to have a deviation from the dc internal resistance value (on-line detection) in the actual application.
In summary, the prior art needs to additionally increase the detection cost when detecting the internal resistance of the vehicle battery, and the detection range and accuracy are not sufficient.
Disclosure of Invention
In view of the above, there is a need to provide an on-line detection method, system, device and medium for detecting the direct current internal resistance of a low-voltage battery for a vehicle, which solve the problems in the prior art that additional detection cost is required to be added when detecting the internal resistance of the battery of the vehicle, and the detection range and accuracy are not sufficient.
In order to solve the technical problem, in one aspect, the present invention provides an online detection method for dc internal resistance of a low-voltage battery for a vehicle, including:
acquiring battery characteristic parameters when a battery works at a preset frequency based on a vehicle BMS;
sequentially acquiring a current difference value between the maximum discharge current and the minimum discharge current in battery characteristic parameters acquired in a current data window based on a sliding data window with a preset length;
comparing the current difference value with a preset current threshold value, and calculating the real-time internal resistance value of the battery in the current data window when the current difference value is larger than the preset current threshold value;
verifying the real-time battery internal resistance value based on a preset rationality detection method, and keeping the real-time battery internal resistance value meeting preset verification conditions as an effective battery internal resistance value;
continuously calculating the corresponding current difference value in the next data window based on the sliding data window with the preset length, performing the comparison operation or the comparison operation and the verification operation to obtain a plurality of effective battery internal resistance values until a preset termination condition is reached, finishing the calculation of the battery internal resistance, and calculating an average value based on the plurality of effective battery internal resistance values to obtain a target battery internal resistance value;
and when the battery characteristic parameters accord with a preset interval, calculating an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance.
In some possible implementations, the battery characteristic parameters include: voltage, current, battery temperature, and battery SOC.
In some possible implementation manners, the sequentially obtaining, based on the sliding data window with the preset length, a current difference between a maximum discharge current and a minimum discharge current in the battery characteristic parameters collected in the current data window includes:
intercepting a plurality of voltage and discharge current data in the collected battery characteristic parameters based on a sliding data window with a preset length;
extracting maximum discharge current data and minimum discharge current in the plurality of voltages and discharge currents;
and calculating the current difference value of the large discharge current and the minimum discharge current.
In some possible implementation manners, the comparing the current difference value with a preset current threshold value, and when the current difference value is greater than the preset current threshold value, calculating a real-time battery internal resistance value in a current data window includes:
comparing the current difference with a set current threshold, and if the current difference is not greater than the set current threshold, not calculating the internal resistance of the battery at this time;
if the current difference is larger than a set current threshold, determining a first voltage and a second voltage corresponding to the maximum discharge current and the minimum discharge current;
calculating the real-time internal resistance value of the battery in the current data window based on the maximum discharge current, the minimum discharge current, the first voltage and the second voltage, wherein the calculation method comprises the following steps:
wherein R is i The current battery ith calculated real-time internal resistance value of the battery, I =1 … N, N is the total number of times of calculating internal resistance, I max To maximum discharge current, I min Is the minimum discharge current, U Indexmax Is a first voltage, U Indexmin Is a second voltage.
In some possible implementation manners, the verifying the real-time internal battery resistance value based on the preset rationality detection method, and retaining the real-time internal battery resistance value meeting the preset verification condition as an effective internal battery resistance value includes:
offline measurement of current test internal resistance value R of battery test If the real-time battery internal resistance value R i Meets the preset verification condition
The real-time internal resistance value of the battery calculated this time is effective and is recorded as an effective internal resistance value of the battery;
otherwise, the real-time battery internal resistance R is calculated at this time i If the current internal resistance value is invalid, discarding the current calculation of the internal resistance value of the real-time battery;
wherein Tol1 and Tol2 are preset tolerance.
In some possible implementations, the preset termination condition includes:
and accumulating 10 effective battery internal resistance values, or in 3 continuous data windows, enabling the current difference value not to be larger than the preset current threshold value.
In some possible implementation manners, the preset interval includes: presetting a temperature interval and a SOC interval;
the preset temperature interval is 25 +/-5 ℃, and the preset SOC interval is 100% +/-5%.
On the other hand, the invention also provides an on-line detection system for the direct current internal resistance of the low-voltage battery for the vehicle, which comprises the following steps:
the data acquisition module is used for acquiring battery characteristic parameters of the battery during operation at a preset frequency based on the BMS;
the difference value calculation module is used for sequentially acquiring the current difference value of the maximum discharge current and the minimum discharge current in the battery characteristic parameters acquired in the current data window based on the sliding data window with the preset length;
the real-time internal resistance calculation module is used for comparing the current difference value with a preset current threshold value, and calculating the real-time internal resistance value of the battery in the current data window when the current difference value is larger than the preset current threshold value;
the verification module is used for verifying the real-time battery internal resistance value based on a preset rationality detection method, and keeping the real-time battery internal resistance value meeting preset verification conditions as an effective battery internal resistance value;
the target internal resistance calculation module is used for continuously calculating a corresponding current difference value in the next data window based on the sliding data window with the preset length, performing comparison operation or comparison operation and verification operation to obtain a plurality of effective battery internal resistance values until a preset termination condition is reached, finishing the calculation of the battery internal resistance, and calculating an average value based on the effective battery internal resistance values to obtain a target battery internal resistance value;
and the aging internal resistance calculation module is used for calculating an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance when the battery characteristic parameters accord with a preset interval.
On the other hand, the invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the program, the on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle in the implementation mode is realized.
Finally, the invention also provides a computer readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for detecting the direct current internal resistance of the low-voltage battery for the vehicle on line is realized.
The beneficial effects of adopting the above embodiment are: according to the on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle, provided by the invention, the battery internal resistance is calculated by acquiring the battery characteristic parameters of the battery during the operation of the battery on line through the vehicle battery management system BMS, so that on one hand, the measurement cost is not additionally increased, and on the other hand, the measured internal resistance of the battery under the actual working condition can be calculated on line in any temperature and SOC range compared with the traditional off-line detection method, so that the measured internal resistance of the battery can reflect the actual condition of the battery better, and the calculated internal resistance of the battery is more accurate and wider in measurement range.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for detecting dc internal resistance of a low-voltage battery for a vehicle on line according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of an on-line detection system for direct-current internal resistance of a low-voltage battery for a vehicle according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of an electronic device provided in the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the schematic drawings are not necessarily to scale. The flowcharts used in this disclosure illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flow diagrams may be performed out of order, and that steps without logical context may be performed in reverse order or concurrently. In addition, one skilled in the art, under the direction of the present disclosure, may add one or more other operations to the flowchart, or may remove one or more operations from the flowchart.
Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor systems and/or microcontroller systems.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Prior to the description of the embodiments, the prior art and the inventive concept are explained:
during the charging and discharging process of the battery, lithium ions are desorbed between the positive electrode and the negative electrode of the battery and migrate in the electrolyte, and the impedance of the battery is generated due to the obstruction of factors such as the internal material of the battery, the electrolyte and the like in the process. The concentration and temperature of the active material and the electrolyte in the battery vary according to the battery state and the external environment, and therefore the internal resistance of the battery also varies. It is known from the existing literature research that the internal resistance of the battery is mainly influenced by temperature, SOC and dynamic working conditions. The battery internal resistance detection method can be divided into direct current detection and alternating current detection. The direct current detection method is that a direct current pulse is loaded to a battery, and the direct current resistance is calculated by detecting the voltage drop under a certain loading current. An alternating current detection method, also known as Electrochemical Impedance Spectroscopy (EIS). The electrochemical impedance spectrum is that when the battery is in a balanced state, a small-amplitude sine alternating current excitation signal is applied, and the impedance under the current frequency is calculated by calculating the alternating current excitation response and the sine alternating current excitation under the same frequency. The difficulty of acquiring the alternating current impedance on line is high, and the method is more suitable for an off-line scene, such as a 4S store.
In the prior art, an additional electrical element (heating chip) is required to be added to the on-line detection method for internal resistance of a battery as proposed in patent CN113514772a to realize active control of discharge pulses, and such a design would result in an increase in cost. In addition, the method for detecting the internal resistance of the battery on line, which is proposed by the patent CN113514772a, only performs resistance detection in a certain SOC interval and temperature range, so that a dead zone exists in the fault monitoring related to the internal resistance of the battery. Also, as set forth in patent CN101477149B, an online direct current detection method for internal resistance of a storage battery needs to set a resistance self-check mode, and the storage battery discharges according to a set current and lasts for 0.1-10 s in the self-check mode, however, in the field of low-voltage batteries for vehicles, the low-voltage battery is used as a power source of vehicle-mounted equipment and electric appliances to provide energy supply for the vehicle-mounted equipment and the electric appliances, and the low-voltage battery cannot actively control discharge pulses. Namely, the feasibility of presetting a self-checking mode or discharging according to preset pulse current in the field of low-voltage batteries for vehicles is very low. For example, CN110208701B proposes a method for detecting the direct current internal resistance of a power lithium battery, which essentially obtains the direct current internal resistance value of the battery according to an SOC table look-up method, wherein a one-dimensional table referred to by the method is the internal resistance value obtained by testing under a preset working condition (generally referred to as an offline detection method); the actual application working condition of the battery is often different from the preset test working condition, so that the internal resistance value obtained by table lookup deviates from the direct-current internal resistance value in the actual application (on-line monitoring). Finally, the method for detecting the direct current resistance of the power battery, as proposed in patent CN107765184B, is an improvement of the conventional method for detecting the direct current resistance value by HPPC, and is still an off-line method for detecting the direct current resistance in a laboratory or a test bench, and cannot be used for on-line detection of the direct current resistance.
The invention aims to provide a method for realizing the on-line detection of the direct current internal resistance of a battery by capturing passive and non-preset current pulses and simultaneously considering the measurement cost, the measurement precision and the measurement range.
Specific examples are described below in detail, and it should be noted that the order of description of the following examples is not intended to limit the preferred order of the examples.
The embodiment of the invention provides an on-line detection method, system, equipment and medium for direct current internal resistance of a low-voltage battery for a vehicle.
As shown in fig. 1, fig. 1 is a schematic flow chart of an embodiment of an online detection method for direct current internal resistance of a low-voltage battery for a vehicle, provided by the invention, and the online detection method for direct current internal resistance of a low-voltage battery for a vehicle includes:
s101, collecting battery characteristic parameters of a battery during operation at a preset frequency based on a vehicle BMS;
s102, sequentially acquiring a current difference value between the maximum discharge current and the minimum discharge current in battery characteristic parameters acquired in a current data window based on a sliding data window with a preset length;
s103, comparing the current difference value with a preset current threshold value, and calculating a real-time internal resistance value of the battery in the current data window when the current difference value is larger than the preset current threshold value;
s104, verifying the real-time battery internal resistance value based on a preset rationality detection method, and keeping the real-time battery internal resistance value meeting preset verification conditions as an effective battery internal resistance value;
s105, continuously calculating a corresponding current difference value in the next data window based on the sliding data window with the preset length, performing the comparison operation, or performing the comparison operation and the verification operation to obtain a plurality of effective battery internal resistance values until a preset termination condition is reached, finishing the calculation of the battery internal resistance, and calculating an average value based on the plurality of effective battery internal resistance values to obtain a target battery internal resistance value;
and S106, when the battery characteristic parameters accord with a preset interval, calculating an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance.
Compared with the prior art, the on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle, provided by the invention, has the advantages that the battery characteristic parameters of the battery during the working of the battery are obtained on line through the BMS (battery management system) of the vehicle to calculate the internal resistance of the battery, on one hand, the additional measurement cost is not increased, on the other hand, the internal resistance of the battery during the measured actual working condition can be calculated on line within any temperature and SOC range compared with the traditional off-line detection method, so that the actual condition of the battery can be reflected by the measured internal resistance of the battery, and the calculated internal resistance of the battery is more accurate and wider in measurement range.
Optionally, in a specific embodiment of the present invention, in step S101, the battery management system collects battery characteristic parameters at a certain frequency, where the battery characteristic parameters include: voltage, current, battery temperature, and battery SOC. In the present embodiment, the sampling frequency is 100Hz.
Further, in some embodiments of the present invention, step S102 includes:
intercepting a plurality of voltages and discharge current numbers in the collected battery characteristic parameters based on a sliding data window with a preset length;
extracting the maximum discharge current and the minimum discharge current in the voltage and discharge current data;
and calculating the current difference value of the large discharge current data and the minimum discharge current data.
In the specific embodiment of the invention, the latest L voltage and discharge current data are intercepted by a sliding data window with a preset length, and the maximum discharge current I in the data window is extracted max And a minimum discharge current I min And calculating the difference value delta I between the maximum discharge current and the minimum discharge current.
In this embodiment, L =50, and the data window length is 0.5s.
Further, in some embodiments of the present invention, step S103 includes:
comparing the current difference with a set current threshold, and if the current difference is not greater than the set current threshold, not calculating the internal resistance of the battery at this time;
if the current difference is larger than a set current threshold, determining a first voltage and a second voltage corresponding to the maximum discharge current and the minimum discharge current;
calculating the real-time internal battery resistance value in the current data window based on the maximum discharge current, the minimum discharge current, the first voltage and the second voltage, wherein the calculation method comprises the following steps:
wherein R is i The real-time battery internal resistance value calculated for the ith time of the current battery, I =1 … N, N is the total number of times of calculating the internal resistance, I max To maximum discharge current, I min Minimum discharge current, U Indexmax Is a first voltage, U Indexmin Is a second voltage.
In this embodiment, the predetermined current threshold is 150A.
Further, in some embodiments of the present invention, step S104 includes:
offline measurement of current test internal resistance value R of battery test If the real-time battery internal resistance value R i Compliance with preset verificationCondition
The real-time internal resistance value of the battery calculated this time is effective and is recorded as an effective internal resistance value of the battery;
otherwise, the real-time battery internal resistance R is calculated at this time i If the current battery internal resistance value is invalid, discarding the real-time battery internal resistance value calculated at this time;
wherein Tol1 and Tol2 are preset tolerance.
In the present embodiment, tol1=0.5 and Tol2=2.
It should be noted that, because the sampling and estimation errors are considered, a certain tolerance is set for the estimated internal resistance of the battery, where the offline measurement is the dc resistance obtained according to the preset test condition in the laboratory environment or the test bench, the test condition in the offline measurement as described in the inventive concept is preset (preset SOC, temperature, current, and duration), and is different from the actual condition, so the resistance value of the offline measurement deviates from the actual resistance value, which is used as a reference value and is set to a certain tolerance in this embodiment, so as to improve the robustness of the online detection method for the dc internal resistance of the low-voltage battery for vehicles provided in this embodiment of the present invention.
Further, in the specific embodiment of the present invention, in step S105, a sliding data window with a preset length slides to the right, continuously intercepts the latest L data, and rejects the previous data. That is, for a data window with fixed data length, each sampling time has a new measurement data added into the data window, and an oldest data is removed, so as to keep the length of the data window always L. The effective battery internal resistance value is calculated and stored with reference to the methods in steps S102 to S104.
And when any one of the following conditions is met, finishing the calculation of the internal resistance of the battery:
condition 1: 10 effective internal resistance values of the batteries are obtained through accumulation;
condition 2: in consecutive 3 data windows, the current difference Δ I is not greater than the preset current threshold. Since at this point the current can be considered to have stabilized, i.e. the current pulse has ended.
After the calculation of the internal resistance of the battery is finished, calculating the internal resistance values of the N effective batteries, and calculating the average value of the internal resistance values as the internal resistance value R of the target battery to output:
further, in a specific embodiment of the present invention, in step S106, when the battery characteristic parameter meets the preset interval, and the battery internal resistance is used to represent the battery health state, the conditions that the battery internal resistance needs to be tested under the temperature and SOC conditions during each calculation are consistent, so that the two tests are under the same reference.
In this embodiment, the preset temperature interval is 25 ± 5 ℃, and the preset SOC interval is 100% ± 5%.
If and only if the temperature and the SOC are within the preset range, calculating the aging internal resistance R with reference to the above steps S101-S105 Age . The significance of measuring the direct-current internal resistance of the battery and the aging internal resistance of the battery is that the former can provide information for fault detection and battery function prediction, and the latter can be used for representing the health state of the battery.
According to the on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle, provided by the invention, the battery internal resistance is calculated by acquiring the battery characteristic parameters of the battery during the operation of the battery on line through the vehicle battery management system BMS, so that on one hand, the measurement cost is not additionally increased, and on the other hand, the measured internal resistance of the battery under the actual working condition can be calculated on line in any temperature and SOC range compared with the traditional off-line detection method, so that the measured internal resistance of the battery can reflect the actual condition of the battery better, and the calculated internal resistance of the battery is more accurate and wider in measurement range.
In order to better implement the method for online detection of the direct current internal resistance of the low-voltage battery for the vehicle in the embodiment of the present invention, on the basis of the method for online detection of the direct current internal resistance of the low-voltage battery for the vehicle, correspondingly, the embodiment of the present invention further provides an online detection system for the direct current internal resistance of the low-voltage battery for the vehicle, as shown in fig. 2, the online detection system 200 for the direct current internal resistance of the low-voltage battery for the vehicle includes:
the data acquisition module 201 is used for acquiring battery characteristic parameters when the battery works at a preset frequency based on the BMS;
a difference value calculation module 202, configured to sequentially obtain, based on a sliding data window with a preset length, a current difference value between a maximum discharge current and a minimum discharge current in battery characteristic parameters acquired in a current data window;
the real-time internal resistance calculation module 203 is configured to compare the current difference with a preset current threshold, and calculate a real-time internal battery resistance value in a current data window when the current difference is greater than the preset current threshold;
the verification module 204 is used for verifying the real-time internal battery resistance value based on a preset rationality detection method, and keeping the real-time internal battery resistance value meeting preset verification conditions as an effective internal battery resistance value;
the target internal resistance calculation module 205 is configured to continue to calculate a corresponding current difference in a next data window based on a sliding data window with a preset length, perform the comparison operation or the comparison operation and the verification operation to obtain a plurality of effective battery internal resistance values, end the calculation of the battery internal resistance until a preset termination condition is reached, and calculate an average value based on the plurality of effective battery internal resistance values to obtain a target battery internal resistance value;
and the aging internal resistance calculation module 206 is configured to calculate an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance when the battery characteristic parameter meets a preset interval.
The on-line detection system 200 for the direct current internal resistance of the low-voltage battery for the vehicle provided in the above embodiment can implement the technical solutions described in the above on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle, and the specific implementation principles of the above modules or units can be referred to the corresponding contents in the above on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle, which are not described herein again.
As shown in fig. 3, the present invention further provides an electronic device 300 accordingly. The electronic device 300 comprises a processor 301, a memory 302 and a display 303. Fig. 3 shows only some of the components of the electronic device 300, but it is to be understood that not all of the shown components are required to be implemented, and that more or fewer components may be implemented instead.
The processor 301 may be a Central Processing Unit (CPU), a microprocessor or other data Processing chip in some embodiments, and is configured to run program codes stored in the memory 302 or process data, for example, the on-line detection program for dc internal resistance of the low-voltage battery for vehicle in the present invention.
In some embodiments, the processor 301 may be a single server or a group of servers. The server groups may be centralized or distributed. In some embodiments, the processor 301 may be local or remote. In some embodiments, the processor 301 may be implemented in a cloud platform. In an embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an intra-site, a multi-cloud, and the like, or any combination thereof.
The storage 302 may be an internal storage unit of the electronic device 300 in some embodiments, such as a hard disk or a memory of the electronic device 300. The memory 302 may also be an external storage device of the electronic device 300 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the electronic device 300.
Further, the memory 302 may also include both internal storage units and external storage devices of the electronic device 300. The memory 302 is used for storing application software and various types of data for installing the electronic device 300.
The display 303 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 303 is used for displaying information at the electronic device 300 and for displaying a visualized user interface. The components 301-303 of the electronic device 300 communicate with each other via a system bus.
In an embodiment, when the processor 301 executes the on-line detection program for the dc internal resistance of the low-voltage battery for vehicle in the memory 302, the following steps can be implemented:
acquiring battery characteristic parameters when a battery works at a preset frequency based on a vehicle BMS;
sequentially acquiring a current difference value between the maximum discharge current and the minimum discharge current in battery characteristic parameters acquired in a current data window based on a sliding data window with a preset length;
comparing the current difference value with a preset current threshold value, and calculating the real-time internal resistance value of the battery in the current data window when the current difference value is larger than the preset current threshold value;
verifying the real-time battery internal resistance value based on a preset rationality detection method, and keeping the real-time battery internal resistance value meeting preset verification conditions as an effective battery internal resistance value;
continuously calculating a corresponding current difference value in the next data window based on a sliding data window with a preset length, performing comparison operation or comparison operation and verification operation to obtain a plurality of effective battery internal resistance values until a preset termination condition is reached, finishing the calculation of the battery internal resistance, and calculating an average value based on the effective battery internal resistance values to obtain a target battery internal resistance value;
and when the battery characteristic parameters accord with a preset interval, calculating an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance.
It should be understood that: when the processor 301 executes the on-line detection program for the direct current internal resistance of the low-voltage battery for the vehicle in the memory 302, in addition to the above functions, other functions may be implemented, which may be specifically referred to the description of the corresponding method embodiment above.
Further, the type of the mentioned electronic device 300 is not specifically limited in the embodiment of the present invention, and the electronic device 300 may be a portable electronic device such as a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), a wearable device, and a laptop computer (laptop). Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices that carry an IOS, android, microsoft, or other operating system. The portable electronic device may also be other portable electronic devices such as laptop computers (laptop) with touch sensitive surfaces (e.g., touch panels), etc. It should also be understood that in other embodiments of the present invention, the electronic device 300 may not be a portable electronic device, but may be a desktop computer having a touch-sensitive surface (e.g., a touch pad).
Correspondingly, the embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer-readable program or instruction, and when the program or instruction is executed by a processor, the steps or functions in the method for detecting direct current internal resistance of a low-voltage battery for a vehicle provided by the foregoing method embodiments can be implemented.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by instructing relevant hardware (such as a processor, a controller, etc.) by a computer program, and the computer program may be stored in a computer readable storage medium. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The method, the system, the equipment and the storage medium for detecting the direct current internal resistance of the low-voltage battery for the vehicle on line are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An on-line detection method for direct current internal resistance of a low-voltage battery for a vehicle is characterized by comprising the following steps:
acquiring battery characteristic parameters when a battery works at a preset frequency based on a vehicle BMS;
sequentially acquiring a current difference value between the maximum discharge current and the minimum discharge current in battery characteristic parameters acquired in a current data window based on a sliding data window with a preset length;
comparing the current difference value with a preset current threshold value, and calculating the real-time internal resistance value of the battery in the current data window when the current difference value is larger than the preset current threshold value;
verifying the real-time battery internal resistance value based on a preset rationality detection method, and keeping the real-time battery internal resistance value meeting preset verification conditions as an effective battery internal resistance value;
continuously calculating a corresponding current difference value in the next data window based on the sliding data window with the preset length, and performing the comparison operation or the comparison operation and the verification operation to obtain a plurality of effective battery internal resistance values until a preset termination condition is reached, finishing the calculation of the battery internal resistance, and calculating an average value based on the plurality of effective battery internal resistance values to obtain a target battery internal resistance value;
and when the battery characteristic parameters accord with a preset interval, calculating an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance.
2. The on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle according to claim 1, wherein the battery characteristic parameters comprise: voltage, current, battery temperature, and battery SOC.
3. The on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle according to claim 2, wherein the step of sequentially obtaining the current difference value between the maximum discharge current and the minimum discharge current in the battery characteristic parameters collected in the current data window based on the sliding data window with the preset length comprises the following steps:
intercepting a plurality of voltage and discharge current data in the acquired battery characteristic parameters based on a sliding data window with a preset length;
extracting the maximum discharge current and the minimum discharge current in the voltage and discharge current data;
and calculating the current difference value of the large discharge current and the minimum discharge current.
4. The on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle of claim 3, wherein the comparing the current difference value with a preset current threshold value, and when the current difference value is greater than the preset current threshold value, calculating the real-time internal resistance value of the battery in the current data window comprises:
comparing the current difference with a set current threshold, and if the current difference is not greater than the set current threshold, not calculating the internal resistance of the battery at this time;
if the current difference is larger than a set current threshold, determining a first voltage and a second voltage corresponding to the maximum discharge current and the minimum discharge current;
calculating the real-time internal resistance value of the battery in the current data window based on the maximum discharge current, the minimum discharge current, the first voltage and the second voltage, wherein the calculation method comprises the following steps:
wherein R is i The real-time battery internal resistance value calculated for the ith time of the current battery, I =1 … N, N is the total number of times of calculating the internal resistance, I max To maximum discharge current, I min Is the minimum discharge current, U Indexmax Is a first voltage, U Indexmin Is a second voltage.
5. The on-line detection method for the direct-current internal resistance of the low-voltage battery for the vehicle according to claim 4, wherein the verifying operation of the real-time internal resistance value of the battery based on the preset rationality detection method is performed, and the real-time internal resistance value meeting the preset verification condition is reserved as an effective internal resistance value of the battery, and comprises the following steps:
offline measurement of current test internal resistance value R of battery test If the real-time battery internal resistance value R i Meets the preset verification condition
The real-time internal resistance value of the battery calculated this time is valid and is recorded as an effective internal resistance value of the batteryResistance value;
otherwise, the real-time battery internal resistance R is calculated at this time i If the current battery internal resistance value is invalid, discarding the real-time battery internal resistance value calculated at this time;
wherein Tol1 and Tol2 are preset tolerance.
6. The on-line detection method for the direct-current internal resistance of the low-voltage battery for the vehicle according to claim 5, wherein the preset termination condition comprises:
and accumulating 10 effective battery internal resistance values, or in 3 continuous data windows, enabling the current difference value not to be larger than the preset current threshold value.
7. The on-line detection method for the direct-current internal resistance of the low-voltage battery for the vehicle according to claim 5, wherein the preset interval comprises: presetting a temperature interval and a SOC interval;
the preset temperature interval is 25 +/-5 ℃, and the preset SOC interval is 100% +/-5%.
8. The utility model provides an online detecting system of automobile-used low-voltage battery direct current internal resistance which characterized in that includes:
the data acquisition module is used for acquiring battery characteristic parameters when the battery works at a preset frequency based on the BMS;
the difference value calculation module is used for sequentially acquiring the current difference value of the maximum discharge current and the minimum discharge current in the battery characteristic parameters acquired in the current data window based on the sliding data window with the preset length;
the real-time internal resistance calculation module is used for comparing the current difference value with a preset current threshold value, and calculating the real-time internal resistance value of the battery in the current data window when the current difference value is larger than the preset current threshold value;
the verification module is used for verifying the internal resistance value of the real-time battery based on a preset rationality detection method, and keeping the internal resistance value of the real-time battery meeting preset verification conditions as an effective internal resistance value of the battery;
the target internal resistance calculation module is used for continuously calculating a corresponding current difference value in the next data window based on the sliding data window with the preset length, performing the comparison operation or the comparison operation and the verification operation to obtain a plurality of effective internal resistance values of the battery until a preset termination condition is reached, finishing the calculation of the internal resistance of the battery, and calculating an average value based on the effective internal resistance values of the battery to obtain a target internal resistance value of the battery;
and the aging internal resistance calculation module is used for calculating an average value based on the effective battery internal resistance values to obtain the battery aging internal resistance when the battery characteristic parameters accord with a preset interval.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor executes the program to implement the on-line detection method for the direct current internal resistance of the low-voltage battery for the vehicle according to any one of claims 1 to 7.
10. A computer-readable storage medium on which a computer program is stored, the program being characterized in that when being executed by a processor, it implements the on-line detection method for direct-current internal resistance of a low-voltage battery for a vehicle according to any one of claims 1 to 7.
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