CN115598549A - Method and device for determining standard of voltage difference of battery pack offline and electronic equipment - Google Patents
Method and device for determining standard of voltage difference of battery pack offline and electronic equipment Download PDFInfo
- Publication number
- CN115598549A CN115598549A CN202211228683.7A CN202211228683A CN115598549A CN 115598549 A CN115598549 A CN 115598549A CN 202211228683 A CN202211228683 A CN 202211228683A CN 115598549 A CN115598549 A CN 115598549A
- Authority
- CN
- China
- Prior art keywords
- voltage difference
- battery pack
- determining
- cell voltage
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a method and a device for determining a standard of a line voltage difference of a battery pack and electronic equipment, wherein the method comprises the following steps: determining the lowest energy requirement of a battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model; determining an influence coefficient of capacity failure caused by the voltage difference of electric cores in the battery pack based on the lowest energy requirement of the battery pack; determining the maximum SOC variation corresponding to the cell voltage difference according to the influence coefficient that the capacity cannot be exerted due to the cell voltage difference; determining a minimum cell voltage difference corresponding to the maximum SOC variation within the SOC interval range of the cell offline test based on the maximum SOC variation corresponding to the cell voltage difference; and correcting the minimum cell voltage difference by adopting the voltage acquisition error to obtain a battery pack line voltage difference standard. According to the method, the reasonable battery pack offline voltage difference standard can be determined, the production can be optimized, and the situations that the cost is increased due to excessive management and control and the requirement of the driving range of the whole vehicle is not met are avoided.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a method and a device for determining a standard voltage difference of a battery pack offline and an electronic device.
Background
In the new energy power battery industry, single battery cells are assembled into a battery pack according to a certain process, because the voltage and the capacity of the single battery cell are limited, the battery pack used by an electric automobile is generally composed of hundreds or even thousands of single battery cells, and the total voltage and the total capacity of the battery pack can meet the requirements of the electric automobile by the parallel connection and the serial connection of the battery cells.
For the battery pack, the voltage difference between the single battery cells is one of the main indexes for representing the consistency of the battery cells. Specifically, the smaller the voltage difference is, the better the cell consistency is, and the battery pack has better discharge performance; on the contrary, the larger the voltage difference is, the worse the battery cell consistency is, the discharge performance of the battery pack is also greatly influenced, and the discharge energy of the battery pack is insufficient, so that the endurance mileage capability of the electric automobile is influenced. Therefore, in the test of the battery pack offline (offline means leaving the production line), the voltage difference of the battery pack needs to be tested and controlled, but too strict voltage difference standard can lead to excessive process control, thereby increasing the cost, and too loose voltage difference standard can not ensure the mileage requirement of the whole vehicle. Therefore, a reasonable offline voltage difference standard is designed, and the method is of great importance to the satisfaction of the driving mileage of the whole vehicle and the cost control.
In summary, how to determine a reasonable standard of the line voltage difference of the battery pack becomes a technical problem which needs to be solved urgently at present.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for determining a standard of a voltage difference between a battery pack and a line, and an electronic device, so as to solve the technical problem that the prior art cannot determine a reasonable standard of a voltage difference between a battery pack and a line.
In a first aspect, an embodiment of the present invention provides a method for determining a standard of a line voltage difference of a battery pack, including:
determining that the minimum energy requirement of a battery pack corresponding to the preset vehicle endurance mileage is met through a vehicle simulation model;
determining an influence coefficient of capacity failure caused by the voltage difference of the electric cores in the battery pack based on the lowest energy requirement of the battery pack;
determining the maximum SOC variation corresponding to the cell voltage difference according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference;
determining a minimum cell voltage difference corresponding to the maximum SOC variation within an SOC interval range of a cell offline test based on the maximum SOC variation corresponding to the cell voltage difference;
and correcting the minimum cell voltage difference by adopting a voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as a line voltage difference standard of the battery pack.
Further, the method for determining the minimum energy requirement of the battery pack corresponding to the preset vehicle endurance mileage through the vehicle simulation model comprises the following steps:
inputting a finished automobile parameter, a reducer parameter, a differential parameter, a tire parameter, a brake parameter, a motor parameter, a battery parameter and a plurality of preset battery pack energies into the finished automobile simulation model to obtain a finished automobile endurance mileage corresponding to each preset battery pack energy;
and determining the lowest energy requirement of the battery pack corresponding to the preset whole vehicle endurance mileage according to the whole vehicle endurance mileage corresponding to the energy of each preset battery pack.
Further, determining an influence coefficient that the capacity cannot be exerted due to the difference of the cell voltages in the battery pack based on the minimum energy requirement of the battery pack includes:
calculating an equation according to an influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cores in the battery pack: and A = the minimum energy requirement of the battery pack/the minimum energy of the battery cells and the total number of the battery cells in the battery pack and the used energy interval of the battery pack B C D, calculating an influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cells in the battery pack, wherein A represents the influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cells in the battery pack, B represents a discharge cut-off voltage and an error influence coefficient, C represents a charge cut-off voltage and an error influence coefficient, and D represents the transportation storage capacity loss.
Further, determining a maximum SOC variation corresponding to the cell voltage difference according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference, includes:
and performing subtraction by using an influence coefficient of which the capacity cannot be exerted due to the preset value and the cell voltage difference to obtain the maximum SOC variation corresponding to the cell voltage difference.
Further, based on the maximum SOC variation corresponding to the cell voltage difference, determining the minimum cell voltage difference corresponding to the maximum SOC variation within the SOC interval range of the cell offline test, including:
and determining the minimum cell voltage difference corresponding to the maximum SOC variation in the SOC-OCV data and within the SOC interval range.
Further, adopt voltage acquisition error to correct minimum electricity core voltage difference, include:
and summing the preset multiple of the voltage acquisition error and the minimum cell voltage difference to obtain the cell voltage difference in the battery pack.
Further, the vehicle parameters at least include: the mass of the whole vehicle, the windward area, the wheelbase, the wind resistance coefficient and the rolling resistance coefficient.
In a second aspect, an embodiment of the present invention further provides a device for determining a standard voltage difference between a line of a battery pack, where the device includes:
the first determining unit is used for determining the requirement of the lowest energy of the battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model;
the second determining unit is used for determining an influence coefficient of capacity failure caused by the voltage difference of the battery cells in the battery pack based on the lowest energy requirement of the battery pack;
a third determining unit, configured to determine, according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference, a maximum SOC variation corresponding to the cell voltage difference;
a fourth determining unit, configured to determine, based on a maximum SOC variation corresponding to the cell voltage difference, a minimum cell voltage difference corresponding to the maximum SOC variation within an SOC interval range of a cell offline test;
and the correcting unit is used for correcting the minimum electric core voltage difference by adopting a voltage acquisition error to obtain the electric core voltage difference in the battery pack, and taking the electric core voltage difference in the battery pack as the standard of the line voltage difference of the battery pack.
In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method according to any one of the first aspect.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to perform the method of any of the first aspects.
In an embodiment of the present invention, a method for determining a standard of a line voltage difference of a battery pack is provided, including: determining the lowest energy requirement of a battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model; determining an influence coefficient of capacity failure caused by the voltage difference of electric cores in the battery pack based on the lowest energy requirement of the battery pack; determining the maximum SOC variation corresponding to the cell voltage difference according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference; determining a minimum cell voltage difference corresponding to the maximum SOC variation within the SOC interval range of the cell offline test based on the maximum SOC variation corresponding to the cell voltage difference; correcting the minimum cell voltage difference by adopting the voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as the wire voltage difference standard of the battery pack. According to the method for determining the offline voltage difference standard of the battery pack, the offline voltage difference standard of the battery pack is calculated according to the lowest energy requirement of the battery pack required by the preset continuous driving mileage of the whole vehicle, the offline voltage difference standard of the battery pack can meet the requirement of the preset continuous driving mileage of the whole vehicle, and is not too severe, so that the reasonable offline voltage difference standard of the battery pack can be determined, the production can be optimized according to the reasonable offline voltage difference standard of the battery pack, the situations that the cost is increased due to excessive management and control and the requirement of the continuous driving mileage of the whole vehicle is not met are avoided, and the technical problem that the reasonable offline voltage difference standard of the battery pack cannot be determined in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for determining a standard of a line voltage difference of a battery pack according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for determining, by a finished vehicle simulation model, a minimum energy requirement of a battery pack corresponding to a preset finished vehicle driving range that is provided by the embodiment of the present invention;
FIG. 3 is a schematic diagram of the embodiment of the present invention showing that after the discharge is cut off at 2.805V, 0.25% of the capacity cannot be exerted;
FIG. 4 is a data graph of SOC-OCV provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a device for determining a standard of a line voltage difference of a battery pack according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present 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.
The prior art can not determine a reasonable standard of the line voltage difference of the battery pack.
Based on the above, in the method for determining the offline voltage difference standard of the battery pack, the offline voltage difference standard of the battery pack is calculated according to the lowest energy requirement of the battery pack required by the preset continuous driving mileage of the whole vehicle, the offline voltage difference standard of the battery pack can meet the requirement of the preset continuous driving mileage of the whole vehicle, and is not too severe, so that the reasonable offline voltage difference standard of the battery pack can be determined, the production can be optimized according to the reasonable offline voltage difference standard of the battery pack, and the situations that the cost is increased due to excessive management and control and the requirement of the continuous driving mileage of the whole vehicle cannot be met are avoided.
To facilitate understanding of the present embodiment, a method for determining a line voltage difference standard of a battery pack disclosed in the embodiment of the present invention is first described in detail.
The first embodiment is as follows:
in accordance with an embodiment of the present invention, there is provided an embodiment of a method for determining a battery pack line voltage difference criterion, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a flowchart of a method for determining a standard of a line voltage difference of a battery pack according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102, determining that the lowest energy requirement of a battery pack corresponding to the preset vehicle endurance mileage is met through a vehicle simulation model;
specifically, the finished automobile simulation model may be an Amesim finished automobile simulation model, and the embodiment of the present invention does not specifically limit the finished automobile simulation model, and may also be other finished automobile simulation models.
The preset vehicle endurance mileage is specifically a vehicle endurance mileage target.
Step S104, determining an influence coefficient that the capacity cannot be exerted due to the voltage difference of electric cores in the battery pack based on the lowest energy requirement of the battery pack;
step S106, determining the maximum SOC variation corresponding to the cell voltage difference according to the influence coefficient of the cell voltage difference causing the capacity not to be exerted;
the maximum SOC variation corresponding to the cell voltage difference refers to a maximum SOC variation of an influence portion corresponding to the cell voltage difference.
Step S108, determining a minimum cell voltage difference corresponding to the maximum SOC variation within the SOC interval range of the cell offline test based on the maximum SOC variation corresponding to the cell voltage difference;
and S110, correcting the minimum cell voltage difference by adopting the voltage acquisition error to obtain a cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as a battery pack line voltage difference standard.
In an embodiment of the present invention, a method for determining a standard of a line voltage difference of a battery pack is provided, including: determining the lowest energy requirement of a battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model; determining an influence coefficient of capacity failure caused by the voltage difference of electric cores in the battery pack based on the lowest energy requirement of the battery pack; determining the maximum SOC variation corresponding to the cell voltage difference according to the influence coefficient that the capacity cannot be exerted due to the cell voltage difference; determining a minimum cell voltage difference corresponding to the maximum SOC variation within the SOC interval range of the cell offline test based on the maximum SOC variation corresponding to the cell voltage difference; correcting the minimum cell voltage difference by adopting the voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as the wire voltage difference standard of the battery pack. According to the method for determining the offline voltage difference standard of the battery pack, the offline voltage difference standard of the battery pack is calculated according to the lowest energy requirement of the battery pack required by the preset continuous driving mileage of the whole vehicle, the offline voltage difference standard of the battery pack can meet the requirement of the preset continuous driving mileage of the whole vehicle, and is not too severe, so that the reasonable offline voltage difference standard of the battery pack can be determined, the production can be optimized according to the reasonable offline voltage difference standard of the battery pack, the situations that the cost is increased due to excessive management and control and the requirement of the continuous driving mileage of the whole vehicle is not met are avoided, and the technical problem that the reasonable offline voltage difference standard of the battery pack cannot be determined in the prior art is solved.
The above description briefly introduces the method for determining the standard of the line voltage difference of the battery pack according to the present invention, and the details related thereto are described in detail below.
In an optional embodiment of the present invention, referring to fig. 2, determining that the minimum energy requirement of the battery pack corresponding to the preset vehicle driving range is met through a vehicle simulation model specifically includes the following steps:
step S201, inputting vehicle parameters, reducer parameters, differential parameters, tire parameters, brake parameters, motor parameters, battery parameters and a plurality of preset battery pack energies into a vehicle simulation model to obtain vehicle endurance mileage corresponding to each preset battery pack energy;
specifically, the vehicle parameters at least include: the mass of the whole vehicle, the windward area, the wheelbase, the wind resistance coefficient and the rolling resistance coefficient.
And S202, determining the lowest energy requirement of the battery pack corresponding to the preset whole vehicle endurance mileage according to the whole vehicle endurance mileage corresponding to each preset battery pack energy.
Specifically, for example: the whole vehicle endurance mileage corresponding to the energy of each preset battery pack is as follows: the driving range of the whole vehicle corresponding to the energy of the battery pack of 50 degrees is 400 kilometers, the driving range of the whole vehicle corresponding to the energy of the battery pack of 40 degrees is 300 kilometers, and the driving range of the whole vehicle is preset to be 400 kilometers, so that the lowest energy requirement of the battery pack corresponding to the driving range of the whole vehicle is 50 degrees.
In an optional embodiment of the present invention, an influence coefficient that a capacity cannot be exerted due to a voltage difference between electric cores in a battery pack is determined based on a minimum energy requirement of the battery pack, and specifically includes the following steps:
calculating a formula according to an influence coefficient that the capacity cannot be exerted due to the voltage difference of the electric cores in the battery pack: a = minimum energy requirement of a battery pack/minimum energy of battery cells + total number of battery cells in the battery pack + energy usage interval of the battery pack + B + C + D, and calculates an influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cells in the battery pack, wherein A represents the influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cells in the battery pack, B represents a discharge cut-off voltage and an error influence coefficient, C represents a charge cut-off voltage and an error influence coefficient, and D represents the transportation storage capacity loss.
The following explains the above calculation formula:
the coefficient B is determined according to the system discharge cut-off voltage, the cell discharge cut-off voltage, and the voltage acquisition error, for example, if the cell discharge cut-off voltage is 2.7V, the system discharge cut-off voltage is 2.8V, and the voltage acquisition error is 5mV, then the influence coefficient of the system discharge cut-off voltage 2.805V with respect to the cell discharge cut-off voltage 2.7V needs to be considered, and is: the capacity value corresponding to 2.805V is different from the capacity value corresponding to 2.7V, and the difference is divided by the capacity value corresponding to 2.7V, and the obtained result indicates the capacity that cannot be exerted, as shown in fig. 3 as 0.25%, the capacity value corresponding to each voltage can be obtained from the experimental data of the actual battery cell, and indicates the capacity value that can be released from full discharge to the voltage (the capacity value obtained for different battery cells is multiple, but the ratio of the capacity difference corresponding to the two voltages to the total capacity is basically unchanged).
Fig. 3 shows that 0.25% of the capacity cannot be exerted after the discharge cutoff at 2.805V, and the coefficient B can be determined to be 1-0.25% =99.75% (indicating the percentage of the capacity actually exerted); similarly, during charging, the same consideration as for the off-voltage during charging is also required, and therefore, the influence coefficient C is obtained.
The coefficient D is determined by considering that there is some time for transportation and storage after the battery pack is produced until the battery pack is used by a user, so that energy loss caused during transportation and storage needs to be considered in calculation of the minimum capacity, and the coefficient D can be determined according to battery cell storage test process data (known data of how much energy loss is caused by how long the battery pack is transported and stored at a certain temperature and given by a battery cell manufacturer).
The minimum energy of the battery cell is also given by a battery cell manufacturer, and the battery cell manufacturer produces 1000 battery cells and can give the value of the minimum energy of the battery cell of the 1000 battery cells.
The total number of the battery cores in the battery pack can also be determined according to the design scheme of the battery pack.
The battery pack usage energy interval represents an SOC interval used by the whole vehicle, for example, the SOC interval used by the whole vehicle is 5% to 95%, which is provided by the whole vehicle factory or suggested by the battery cell factory, where the battery pack usage energy interval is a difference between an upper limit value and a lower limit value of the battery pack usage energy interval, for example, the battery pack usage energy interval is 5% to 95%, and when calculating, the battery pack usage energy interval =95% to 5% =90%.
Specifically, if the minimum energy requirement of the battery pack, the minimum energy of the battery cells, the total number of the battery cells in the battery pack, the energy use interval of the battery pack, B, C, and D are all determined, the influence coefficient a that the capacity cannot be exerted due to the voltage difference of the battery cells can be calculated.
In an optional embodiment of the present invention, determining a maximum SOC variation corresponding to the cell voltage difference according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference specifically includes:
and (4) carrying out difference by adopting an influence coefficient which cannot exert the capacity due to the preset value and the cell voltage difference to obtain the maximum SOC variation corresponding to the cell voltage difference.
Specifically, the maximum SOC variation corresponding to the cell voltage difference (i.e., the maximum Δ SOC of the affected part corresponding to the cell voltage difference) is calculated according to the influence coefficient, which is calculated and derived and causes the capacity not to be exerted. For example: the influence coefficient that the calculated cell voltage difference causes the capacity to be unable to be exerted is 94%, and then the maximum SOC variation corresponding to the cell voltage difference is 1-94% =6%.
It should be noted that: the preset value may be 1.
In an optional embodiment of the present invention, determining, based on a maximum SOC variation corresponding to the cell voltage difference, a minimum cell voltage difference corresponding to the maximum SOC variation within an SOC interval range of the cell offline test specifically includes:
in the SOC-OCV data, and within the range of the SOC interval, the minimum cell voltage difference corresponding to the maximum SOC variation is determined.
Specifically, the SOC interval range of the battery core offline test refers to the SOC interval range of the battery core after the battery core is taken off from the production line, and fig. 4 shows a data curve of SOC-OCV, from which it is determined that the minimum battery core voltage difference corresponding to the maximum SOC variation of 6% in the SOC interval range is 70mV.
In an optional embodiment of the present invention, the correcting the minimum cell voltage difference by using the voltage acquisition error specifically includes:
and summing the voltage acquisition error of the preset multiple and the minimum electric core voltage difference to obtain the electric core voltage difference in the battery pack.
Specifically, the offline voltage difference is an actual test item, so that the offline voltage difference cannot be influenced by a BMS voltage acquisition error (± 5 mV), the worst case is considered, the case that 70mV is tested and 80mV actually exists is avoided (the cell voltage difference is a difference, if the difference is 80mV, a difference needs to be made between two cell voltage values, the two cell voltage values are both measured respectively, although the difference between the two cell voltage values is 70, the difference is calculated, the calculation is derived from the two measurement values, and one measurement value is located in the previous and next case, so that the 80mV is avoided), and the final offline voltage difference standard setting value is determined to be 70mV-10mv =60mv. That is, 2 times of voltage acquisition error and the minimum cell voltage difference are summed to obtain the cell voltage difference in the battery pack, and the cell voltage difference in the battery pack is used as the line voltage difference standard of the battery pack.
The method can reasonably determine the standard of the voltage difference of the battery pack offline on the premise of ensuring the driving range of the whole vehicle, can optimize production, and avoids the conditions of cost increase caused by excessive management and control and incapability of meeting the driving range requirement of the whole vehicle.
In the method, a calculation formula of the lowest energy requirement of the battery pack is adopted, the maximum acquisition deviation parameter of the BMS is considered, the most severe condition of each parameter is considered to the maximum extent in the voltage difference determination process, and the satisfaction of the driving range of the whole vehicle can be completely ensured; the relation between the determination method of the voltage difference standard and the actual driving range requirement of the whole vehicle is provided, the calculation examples of each link of the standard calculation of the voltage difference of the battery pack are determined, and the method has portability.
Example two:
the embodiment of the present invention further provides a device for determining a standard of a voltage difference between the offline of the battery pack, where the device for determining a standard of a voltage difference between the offline of the battery pack is mainly used for executing the method for determining a standard of a voltage difference between the offline of the battery pack provided in the first embodiment of the present invention, and the device for determining a standard of a voltage difference between the offline of the battery pack provided in the first embodiment of the present invention is specifically described below.
Fig. 5 is a schematic diagram of a device for determining a standard of a line voltage difference of a battery pack according to an embodiment of the present invention, as shown in fig. 5, the device mainly includes: a first determining unit 10, a second determining unit 20, a third determining unit 30, a fourth determining unit 40 and a correcting unit 50, wherein:
the first determining unit is used for determining the lowest energy requirement of the battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model;
the second determining unit is used for determining an influence coefficient of capacity failure caused by the voltage difference of the electric cores in the battery pack based on the lowest energy requirement of the battery pack;
the third determining unit is used for determining the maximum SOC variation corresponding to the cell voltage difference according to the influence coefficient that the capacity cannot be exerted due to the cell voltage difference;
a fourth determining unit, configured to determine, within an SOC interval range of the electrical core offline test, a minimum electrical core voltage difference corresponding to the maximum SOC variation based on the maximum SOC variation corresponding to the electrical core voltage difference;
and the correcting unit is used for correcting the minimum cell voltage difference by adopting the voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as the voltage difference standard of the wire of the battery pack.
In an embodiment of the present invention, a device for determining a standard of a line voltage difference of a battery pack is provided, including: determining the lowest energy requirement of a battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model; determining an influence coefficient of capacity failure caused by the voltage difference of electric cores in the battery pack based on the lowest energy requirement of the battery pack; determining the maximum SOC variation corresponding to the cell voltage difference according to the influence coefficient that the capacity cannot be exerted due to the cell voltage difference; determining a minimum cell voltage difference corresponding to the maximum SOC variation within the SOC interval range of the cell offline test based on the maximum SOC variation corresponding to the cell voltage difference; and correcting the minimum cell voltage difference by adopting a voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as a standard of the line voltage difference of the battery pack. According to the above description, the battery pack offline voltage difference standard determining device is a battery pack offline voltage difference standard calculated according to the lowest energy requirement of a battery pack required by the preset whole vehicle driving range, the battery pack offline voltage difference standard can meet the requirement of the preset whole vehicle driving range and is not too severe, a reasonable battery pack offline voltage difference standard can be determined, the production can be optimized through the reasonable battery pack offline voltage difference standard, the situations that cost is increased due to excessive management and control and the requirement of the whole vehicle driving range is not met are avoided, and the technical problem that the reasonable battery pack offline voltage difference standard cannot be determined in the prior art is solved.
Optionally, the first determining unit is further configured to: inputting the vehicle parameters, the reducer parameters, the differential mechanism parameters, the tire parameters, the brake parameters, the motor parameters, the battery parameters and the energy of a plurality of preset battery packs into a vehicle simulation model to obtain the vehicle endurance mileage corresponding to the energy of each preset battery pack; and determining the lowest energy requirement of the battery pack corresponding to the preset whole vehicle endurance mileage according to the whole vehicle endurance mileage corresponding to the energy of each preset battery pack.
Optionally, the second determining unit is further configured to: calculating an equation according to an influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cores in the battery pack: a = minimum energy requirement of a battery pack/minimum energy of battery cells/total number of battery cells in the battery pack/used energy interval of the battery pack B C D, and an influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cells in the battery pack is calculated, wherein A represents the influence coefficient that the capacity cannot be exerted due to the voltage difference of the battery cells in the battery pack, B represents a discharge cut-off voltage and an error influence coefficient, C represents a charge cut-off voltage and an error influence coefficient, and D represents the loss of the transportation storage capacity.
Optionally, the third determining unit is further configured to: and performing subtraction by using an influence coefficient of which the capacity cannot be exerted due to the difference between the preset value and the cell voltage to obtain the maximum SOC variation corresponding to the cell voltage difference.
Optionally, the fourth determining unit is further configured to: in the SOC-OCV data, and within the range of the SOC interval, the minimum cell voltage difference corresponding to the maximum SOC variation is determined.
Optionally, the correction unit is further configured to: and summing the voltage acquisition error of the preset multiple and the minimum cell voltage difference to obtain the cell voltage difference in the battery pack.
Optionally, the vehicle parameters at least include: the mass, windward area, wheelbase, wind resistance coefficient and roll resistance coefficient of the whole vehicle.
The device provided by the embodiment of the present invention has the same implementation principle and the same technical effects as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to corresponding contents in the foregoing method embodiments for the parts of the device embodiments that are not mentioned.
As shown in fig. 6, an electronic device 600 provided in an embodiment of the present application includes: a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601, when the electronic device is running, the processor 601 communicates with the memory 602 through the bus, and the processor 601 executes the machine-readable instructions to perform the steps of the method for determining the standard of the line voltage difference of the battery pack as described above.
Specifically, the memory 602 and the processor 601 can be general-purpose memory and processor, and are not limited in particular, and when the processor 601 runs a computer program stored in the memory 602, the method for determining the battery pack offline voltage difference criterion can be performed.
The processor 601 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 601. The Processor 601 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the method in combination with the hardware thereof.
In response to the method for determining the offline voltage difference standard of the battery pack, an embodiment of the present application further provides a computer-readable storage medium, where machine executable instructions are stored in the computer-readable storage medium, and when the computer executable instructions are called and executed by a processor, the computer executable instructions cause the processor to execute the step of the method for determining the offline voltage difference standard of the battery pack.
The determining device for the line voltage difference standard of the battery pack provided by the embodiment of the application may be specific hardware on a device, or software or firmware installed on the device, and the like. The device provided in the embodiment of the present application has the same implementation principle and the same technical effects as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to corresponding contents in the foregoing method embodiments for the absence of any mention in the device embodiment. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some communication interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical, mechanical or other form.
For another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, or portions of the technical solutions that substantially contribute to the prior art, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling an electronic device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the vehicle marking method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures, and moreover, the terms "first," "second," "third," etc. are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present application. Are intended to be covered by the scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for determining a standard of a line voltage difference of a battery pack is characterized by comprising the following steps:
determining the lowest energy requirement of a battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model;
determining an influence coefficient of capacity failure caused by the voltage difference of the battery cores in the battery pack based on the lowest energy requirement of the battery pack;
determining the maximum SOC variation corresponding to the cell voltage difference according to the influence coefficient that the capacity cannot be exerted due to the cell voltage difference;
determining a minimum cell voltage difference corresponding to the maximum SOC variation within an SOC interval range of a cell offline test based on the maximum SOC variation corresponding to the cell voltage difference;
and correcting the minimum cell voltage difference by adopting a voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as the standard of the line voltage difference of the battery pack.
2. The method of claim 1, wherein determining that the minimum energy requirement of the battery pack corresponding to the preset vehicle endurance mileage is met through a vehicle simulation model comprises:
inputting vehicle parameters, reducer parameters, differential parameters, tire parameters, brake parameters, motor parameters, battery parameters and a plurality of preset battery pack energies into the vehicle simulation model to obtain vehicle endurance mileage corresponding to each preset battery pack energy;
and determining the lowest energy requirement of the battery pack corresponding to the preset whole vehicle endurance mileage according to the whole vehicle endurance mileage corresponding to each preset battery pack energy.
3. The method of claim 1, wherein determining an influence coefficient of capacity failure caused by a cell voltage difference in the battery pack based on the minimum energy requirement of the battery pack comprises:
calculating a formula according to an influence coefficient that the capacity cannot be exerted due to the voltage difference of the electric cores in the battery pack: and A = the minimum energy requirement/the minimum energy of the battery cell/the total number of the battery cells in the battery pack/the used energy interval of the battery pack B C D, calculating an influence coefficient of the voltage difference of the battery cells in the battery pack, which causes the capacity to be not exerted, wherein A represents the influence coefficient of the voltage difference of the battery cells in the battery pack, B represents a discharge cut-off voltage and an error influence coefficient, C represents a charge cut-off voltage and an error influence coefficient, and D represents the transportation storage capacity loss.
4. The method of claim 1, wherein determining a maximum SOC variation corresponding to the cell voltage difference according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference includes:
and performing subtraction by using an influence coefficient of which the capacity cannot be exerted due to the preset value and the cell voltage difference to obtain the maximum SOC variation corresponding to the cell voltage difference.
5. The method of claim 1, wherein determining a minimum cell voltage difference corresponding to a maximum SOC variation within an SOC interval range of a cell offline test based on the maximum SOC variation corresponding to the cell voltage difference comprises:
and determining the minimum cell voltage difference corresponding to the maximum SOC variation in the SOC-OCV data and within the SOC interval range.
6. The method of claim 1, wherein correcting the minimum cell voltage difference using a voltage acquisition error comprises:
and summing the preset multiple of the voltage acquisition error and the minimum electric core voltage difference to obtain the electric core voltage difference in the battery pack.
7. The method of claim 2, wherein the vehicle parameters include at least: the mass of the whole vehicle, the windward area, the wheelbase, the wind resistance coefficient and the rolling resistance coefficient.
8. A device for determining a standard of a voltage difference of a line of a battery pack is characterized by comprising:
the first determining unit is used for determining the requirement of the lowest energy of the battery pack corresponding to the preset vehicle endurance mileage through a vehicle simulation model;
the second determining unit is used for determining an influence coefficient of capacity failure caused by the voltage difference of the battery cells in the battery pack based on the lowest energy requirement of the battery pack;
a third determining unit, configured to determine, according to an influence coefficient that the capacity cannot be exerted due to the cell voltage difference, a maximum SOC variation corresponding to the cell voltage difference;
a fourth determining unit, configured to determine, within an SOC interval range of a battery offline test, a minimum battery cell voltage difference corresponding to a maximum SOC variation based on the maximum SOC variation corresponding to the battery cell voltage difference;
and the correcting unit is used for correcting the minimum cell voltage difference by adopting a voltage acquisition error to obtain the cell voltage difference in the battery pack, and taking the cell voltage difference in the battery pack as the standard of the line voltage difference of the battery pack.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method of any of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium having stored thereon machine executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211228683.7A CN115598549A (en) | 2022-10-09 | 2022-10-09 | Method and device for determining standard of voltage difference of battery pack offline and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211228683.7A CN115598549A (en) | 2022-10-09 | 2022-10-09 | Method and device for determining standard of voltage difference of battery pack offline and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115598549A true CN115598549A (en) | 2023-01-13 |
Family
ID=84846928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211228683.7A Pending CN115598549A (en) | 2022-10-09 | 2022-10-09 | Method and device for determining standard of voltage difference of battery pack offline and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115598549A (en) |
-
2022
- 2022-10-09 CN CN202211228683.7A patent/CN115598549A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2321663B1 (en) | Apparatus and method for estimating state of health of battery based on battery voltage variation pattern | |
| CN110967637B (en) | Method, device, system and storage medium for estimating allowable power of battery | |
| WO2016208251A1 (en) | Energy storage system | |
| CN112595980A (en) | Method, device and equipment for predicting service life of battery energy storage system | |
| CN113093027B (en) | Battery SOC calibration method, device, system, medium and program product | |
| CN103869253A (en) | Methods and systems for determining whether a voltage measurement is usable for a state of charge estimation | |
| CN113111508A (en) | Battery cell consistency evaluation method and device and server | |
| CN111289911A (en) | SOC estimation method and device based on battery and electronic equipment | |
| JP6161133B2 (en) | Data extraction apparatus, data extraction method, and data extraction program | |
| CN112379270A (en) | Electric vehicle power battery state of charge rolling time domain estimation method | |
| CN110045291B (en) | Lithium battery capacity estimation method | |
| CN115097338A (en) | SOC calibration method, SOH estimation method, device and storage medium | |
| JP2016211923A (en) | Charging amount estimation method and charging amount estimation device | |
| CN114325407A (en) | Battery self-discharge test method, device, equipment and computer storage medium | |
| CN114137415A (en) | Method and device for detecting calorific value of battery pack, vehicle, and storage medium | |
| CN113406498A (en) | Method, system and device for estimating charging time of automobile battery and storage medium | |
| WO2017002953A1 (en) | Data extracting device, data extracting method, and data extracting program | |
| CN115598549A (en) | Method and device for determining standard of voltage difference of battery pack offline and electronic equipment | |
| CN114035049A (en) | SOH precision calculation method and device and electronic equipment | |
| CN112394290A (en) | Method and device for estimating SOH of battery pack, computer equipment and storage medium | |
| US11733305B2 (en) | Method, computer-implemented tool and battery management system for estimating states of health of batteries storing electrical energy and battery energy storage system | |
| CN114764600A (en) | Service life prediction method and device for new energy vehicle battery pack and electronic equipment | |
| CN113311336A (en) | Battery cell level capacity evaluation method and device and electronic equipment | |
| CN114200323A (en) | Battery short-circuit fault early warning information generation method and device, equipment and medium | |
| CN114966453A (en) | Method and related device for acquiring remaining available energy of lithium battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |