CN114325415B - Verification method, device and medium for lithium battery electric quantity - Google Patents
Verification method, device and medium for lithium battery electric quantity Download PDFInfo
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- CN114325415B CN114325415B CN202111679378.5A CN202111679378A CN114325415B CN 114325415 B CN114325415 B CN 114325415B CN 202111679378 A CN202111679378 A CN 202111679378A CN 114325415 B CN114325415 B CN 114325415B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 237
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 237
- 238000000034 method Methods 0.000 title claims abstract description 94
- 238000012795 verification Methods 0.000 title claims description 27
- 238000007599 discharging Methods 0.000 claims abstract description 72
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 22
- 238000004590 computer program Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 abstract description 34
- 238000012545 processing Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 230000010354 integration Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The application discloses a method, a device and a medium for verifying the electric quantity of a lithium battery, comprising the following steps: and controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, and discharging until the display SOC reaches a first preset value in each discharging, wherein the charging is not full except the first full. When the discharging times reach the first preset times, the battery is controlled to be completely discharged to consume time, and whether the consumed time meets the first preset condition is judged to determine that the SOC is accurate. Therefore, the battery is circularly charged and discharged to simulate the situation of the vehicle in actual application, each time of discharging is not completely discharged and each time of charging is not fully charged to simulate the situation that the vehicle cannot be fully charged and discharged in actual use, the battery is completely discharged after multiple times of circulation to obtain time consumption, whether the battery SOC is accurate or not is determined by judging whether the time consumption meets a first preset condition or not, and the detection accuracy of the SOC is improved.
Description
Technical Field
The present application relates to the field of battery detection, and in particular, to a method, an apparatus, and a medium for verifying an electric quantity of a lithium battery.
Background
Along with the continuous improvement Of environmental awareness, the lithium battery is widely applied to vehicles such as industrial vehicles, and in a vehicle lithium battery management system, the accuracy Of the State Of Charge (SOC) Of the battery has important significance, and the SOC accuracy Of the battery directly influences the control strategy Of the battery management system and directly influences the use experience Of a user. In order to detect whether the actual SOC of the lithium battery of the vehicle is consistent with the displayed SOC, that is, to detect the accuracy of the SOC of the vehicle, a full charge and discharge mode is generally adopted to detect, that is, the battery is charged fully, then the vehicle is used for discharging, the vehicle is used for ensuring that the battery is completely discharged with constant current in the discharging process, the actual SOC of the current battery and the displayed SOC are obtained once every preset time in discharging, and whether the actual SOC and the displayed SOC are consistent or not is judged to determine the accuracy of the SOC in the battery system, wherein the battery SOC displayed in the battery management system is calculated through an ampere-hour integration method.
The SOC accuracy of the battery is detected by adopting a full-charge-discharge mode, and because the condition of high power consumption such as uphill and braking exists in the use process of the vehicle, errors exist in the calculation of the SOC of the battery by using an ampere-hour integration method.
Therefore, how to improve the detection accuracy of SOC is a problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a verification method, a device and a medium for the electric quantity of a lithium battery, which are used for simulating the actual service condition of a vehicle by controlling the vehicle lithium battery to be detected to carry out cyclic charge and discharge, wherein the battery is charged for a first time to a first preset value, other coefficients are not charged for the first time except for full charge, when the number of times of discharge reaches the first preset number of times, the battery is controlled to carry out complete discharge, the time consumed by the complete discharge is obtained, whether the time meets the first preset condition is judged, if yes, the SOC of the vehicle lithium battery is determined to be accurate, the error caused by the fact that the full charge discharge is adopted to detect whether the SOC of the vehicle lithium battery is accurate is avoided, and the accuracy of detecting the SOC of the vehicle is improved.
In order to solve the technical problems, the application provides a method for verifying the electric quantity of a lithium battery, which comprises the following steps:
the method comprises the steps of controlling a lithium battery of a vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, wherein each discharging time is until the display SOC of the lithium battery of the vehicle to be detected reaches a first preset value, the first preset value is larger than zero, and the charging times are not full except the first full charge;
When the discharging times reach the first preset times, controlling the lithium battery of the vehicle to be detected to be completely discharged so that the display SOC is reduced to zero from the first preset value;
acquiring the time consumption of the display SOC reduced to zero from the first preset value;
and judging whether the consumed time meets a first preset condition, and if so, determining that the SOC of the lithium battery of the vehicle to be detected is accurate.
Preferably, the controlling the vehicle lithium battery to be detected to perform cyclic charging and discharging includes:
and when the vehicle lithium battery to be detected charges and the display SOC reaches a first threshold value, and/or when the vehicle lithium battery to be detected discharges and the display SOC reaches a second threshold value, correcting the actual SOC of the vehicle lithium battery to be detected.
Preferably, the first preset condition is that the elapsed time is greater than a third threshold and less than a fourth threshold.
Preferably, the method for verifying the electric quantity of the lithium battery further comprises the following steps:
controlling the lithium battery of the vehicle to be detected to be circularly charged and discharged to respective cut-off conditions, and enabling the cycle times to reach a second preset times;
acquiring the total discharge capacity of the lithium battery of the vehicle to be detected and the available capacity of the display SOC each time;
Judging whether the difference value of the total discharge capacity meets a second preset condition, and if so, taking the average value of the total discharge capacity as the actual SOC available capacity of the lithium battery of the vehicle to be detected;
and determining the SOC accuracy of the lithium battery of the vehicle to be detected according to the display SOC available capacity and the actual SOC available capacity.
Preferably, the method for verifying the electric quantity of the lithium battery further comprises the following steps:
heating the fully charged lithium battery of the vehicle to be detected at a first preset temperature;
when the current temperature of the lithium battery of the vehicle to be detected reaches a second preset value, controlling the lithium battery of the vehicle to be detected to discharge until reaching a discharge cut-off condition;
acquiring relevant data of the lithium battery of the vehicle to be detected;
and judging whether the related data meets a third preset condition or not so as to determine the SOC accuracy of the lithium battery of the vehicle to be detected.
Preferably, the method for verifying the electric quantity of the lithium battery further comprises the following steps:
heating the lithium battery of the vehicle to be detected discharged to a discharge cut-off condition at a second preset temperature;
when the current temperature of the lithium battery of the vehicle to be detected reaches a third preset value, controlling the lithium battery of the vehicle to be detected to charge until a charge stop condition is reached;
Acquiring the related data of the lithium battery of the vehicle to be detected;
and judging whether the related data meets a fourth preset condition so as to determine the SOC accuracy of the lithium battery of the vehicle to be detected.
Preferably, the related data includes a discharge capacity, a charge capacity, a time spent for every one degree of temperature rise, an actual SOC, and the display SOC of the lithium battery of the vehicle to be detected.
In order to solve the technical problem, the application also provides a device for verifying the electric quantity of the lithium battery, which comprises:
the first control module is used for controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, wherein each discharging is carried out until the display SOC of the lithium battery of the vehicle to be detected reaches a first preset value, the first preset value is larger than zero, and the charging times are not full except the first full charge;
the second control module is used for controlling the lithium battery of the vehicle to be detected to be completely discharged when the discharging times reach the first preset times so that the display SOC is reduced to zero from the first preset value;
an acquisition module, configured to acquire a time taken for the display SOC to decrease from the first preset value to zero;
The judging module is used for judging whether the consumed time meets a first preset condition, and if the consumed time meets the first preset condition, determining that the SOC of the lithium battery of the vehicle to be detected is accurate.
In order to solve the technical problem, the application also provides a verification device for the electric quantity of the lithium battery, which comprises a memory for storing a computer program;
and the processor is used for realizing the steps of the lithium battery electric quantity verification method when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method for verifying the electric quantity of a lithium battery as described above.
The method for verifying the electric quantity of the lithium battery provided by the application comprises the following steps: and controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, and discharging until the display SOC of the battery reaches a first preset value in each discharging, wherein the first preset value is larger than zero, and the charging is not full except the first full charge, and the rest times are not full. When the number of discharging times reaches the first preset number of times, the battery is controlled to be completely discharged, the display SOC is reduced to zero from the first preset value at the moment, the time consumed by the display SOC reduced to zero from the first preset value is acquired, whether the consumed time meets the first preset condition is judged, and if the first preset condition is met, the SOC of the lithium battery of the vehicle to be detected can be determined to be accurate. Therefore, the technical scheme provided by the application is that the lithium battery of the vehicle to be detected is circularly charged and discharged to simulate the condition of the vehicle in practical application, in addition, each discharge is not completely discharged and each charge is not fully charged to simulate the condition that the vehicle cannot be fully charged and discharged in practical use, the electric quantity of the battery is reduced to zero from a first preset value after multiple times of circulation to realize complete discharge, the time consumed by complete discharge is acquired, whether the consumed time meets the first preset condition is judged, if so, the SOC of the battery can be determined to be accurate, the error caused by the fact that the full charge is adopted to detect the SOC accuracy of the battery in the prior art is avoided, and the detection accuracy of the SOC is improved.
In addition, the application also provides a device and a medium for verifying the electric quantity of the lithium battery, which correspond to the method for verifying the electric quantity of the lithium battery and have the same effects.
Drawings
For a clearer description of embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a flowchart of a method for verifying the electric quantity of a lithium battery provided by the application;
fig. 2 is a block diagram of a verification device for lithium battery electric quantity according to an embodiment of the present application;
fig. 3 is a block diagram of a verification device for lithium battery power according to another embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present application.
The core of the application is to provide a verification method, a device and a medium for the electric quantity of a lithium battery, which are characterized in that the lithium battery of a vehicle to be detected is controlled to carry out cyclic charge and discharge until the discharge times reach a first preset time, wherein each time of discharge reaches the first preset value, the charge is not full except for the first full charge, so as to simulate the situation of the vehicle in actual use, when the discharge reaches the first preset time, the battery is controlled to be completely discharged, the time of complete discharge use is obtained, and whether the time meets the first preset condition is judged to determine whether the SOC of the lithium battery of the vehicle to be detected is accurate or not.
In order to better understand the aspects of the present application, the present application will be described in further detail with reference to the accompanying drawings and detailed description.
With the continuous improvement of people's environmental awareness, electric vehicles are more and more, and electric vehicles are widely used in various scenes, such as private cars, forklifts, etc., the SOC accuracy of the battery is crucial for vehicles using the battery, and the SOC accuracy of the battery is directly related to the use condition of the vehicle and the experience of users. In order to detect whether the SOC of a lithium battery of a vehicle is accurate, the SOC of the battery is generally detected by means of full charge and discharge. The method comprises the steps of fully charging a battery, discharging the battery in a constant current mode by using a vehicle until the lithium battery of the vehicle is completely discharged, and acquiring the display SOC and the actual SOC of the battery every other preset time in the process, wherein the display SOC is acquired through calculation by an ampere-hour integration method.
However, in the case where power consumption such as uphill and braking is large in the process of using the vehicle to discharge, errors are obviously caused in calculating and acquiring the display SOC of the vehicle in a conventional manner, and in addition, in actual vehicle use, the condition of full charge and discharge cannot be always ensured, so that the accuracy of detecting the SOC of the battery is poor.
In order to improve the verification accuracy of the electric quantity of a lithium battery, the invention provides a verification method of the electric quantity of the lithium battery, and fig. 1 is a flowchart of the verification method of the electric quantity of the lithium battery, as shown in fig. 1, the method comprises:
s10: and controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, wherein each discharging is carried out until the display SOC of the lithium battery of the vehicle to be detected reaches a first preset value, the first preset value is larger than zero, and the charging times are not full except the first full charge.
In a specific embodiment, the vehicle lithium battery detection device is connected with the vehicle lithium battery, the switch of the vehicle lithium battery detection device is closed to control the vehicle lithium battery to be detected to charge, after the charging reaches a preset condition, the charging completion is sent to the display screen of the vehicle lithium battery detection device, so that a detection person can discharge the vehicle lithium battery by using the vehicle at the moment, the vehicle can be used for opening an air conditioner, lighting, starting the vehicle to run, and the like. It should be noted that the vehicle lithium battery may be a lithium battery applied to vehicles such as forklifts in the industrial field, or may be a lithium battery of vehicles in other fields, which is not limited to the present invention.
In the detection process, the vehicle to be detected is controlled to be circularly charged and discharged until the number of times of discharge reaches a first preset number of times, and it is to be noted that, because the vehicle is not completely discharged when the vehicle is actually used, that is, the vehicle cannot be started, the battery is usually charged when some electric quantity remains, so that the vehicle to be detected is controlled to be discharged until the display SOC reaches a first preset value when the vehicle to be detected is discharged each time, wherein the first preset value is larger than zero. Of course, it is easily conceivable that the battery is often used after being underfilled during actual use, and therefore, when the vehicle to be detected is controlled to be charged, the remaining times are not full except for the first time of charging. In order to improve accuracy of detecting the vehicle SOC, actual service conditions of the vehicle are simulated as much as possible, and the charge of the other times except for the first charge is different in cut-off electric quantity.
S11: and when the number of discharging times reaches a first preset number of times, controlling the lithium battery of the vehicle to be detected to be completely discharged so as to display that the SOC is reduced to zero from the first preset value.
After the vehicle lithium battery to be detected is circularly charged and discharged in step S10, when the number of times of discharge reaches a first preset number of times, the battery of the vehicle to be detected is controlled to be completely discharged, at this time, the display SOC of the vehicle lithium battery is reduced to zero by a first preset value, and it is to be noted that the charging and the discharging are mutually corresponding, and when the number of times of discharge reaches the first preset number of times, the charging is also carried out by the first preset number of times. In the actual detection, in order to control the detection duration, after the number of times of discharge reaches the first preset number of times, when the battery of the vehicle to be detected is controlled to discharge, the display SOC of the battery may be reduced from the first preset value to a preset value, where the preset value is smaller than the first preset value and greater than zero, for example, the battery of the vehicle to be detected is discharged until the display SOC is 10% each time when the lithium battery of the vehicle to be detected is discharged, and when the number of times of discharge reaches the first preset number of times, the battery is continuously discharged, so that the display SOC is reduced from 10% to 3%, where 3% is the preset value.
S12: the elapsed time to display that the SOC is reduced from the first preset value to zero is acquired.
S13: judging whether the time consumption meets the first preset condition, and if so, proceeding to step S14.
S14: and determining that the SOC of the lithium battery of the vehicle to be detected is accurate.
When the vehicle lithium battery detection device is used for completely discharging the vehicle lithium battery to be detected, the time required for completing the complete discharge is acquired, whether the consumed time meets a first preset condition is judged, and if the consumed time meets the first preset condition, the battery SOC of the vehicle to be detected can be determined to be accurate. The first preset condition may be that the time spent is a fixed value, for example, a fixed value of 10 minutes, and when the time spent is 10 minutes, it is determined that the SOC of the vehicle to be detected is accurate. In the actual detection, in order to improve the detection accuracy, the first preset condition is preferably set to be time-consuming to be larger than the third threshold value and smaller than the fourth threshold value.
In order to further improve the detection accuracy of the SOC of the lithium battery of the vehicle, when the lithium battery detection device of the vehicle controls the vehicle to be detected to carry out cyclic charging and discharging, the lithium battery of the vehicle to be detected is charged, and when the display SOC reaches a first threshold value, the actual SOC of the lithium battery of the vehicle to be detected is corrected, and when the lithium battery of the vehicle to be detected is discharged and the display SOC reaches a second threshold value, the actual SOC of the lithium battery of the vehicle to be detected is corrected, so that errors generated in the vehicle detection process can be corrected, and the detection accuracy of the SOC is ensured.
Of course, the method for verifying the electric quantity of the lithium battery can also determine the SOC accuracy of the lithium battery of the vehicle to be detected by detecting the SOC available capacity, control the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging to respective cut-off conditions, acquire the total discharge capacity and the display SOC available capacity of the lithium battery of the vehicle to be detected each time until the cyclic times reach a second preset times, judge whether the difference value of the total discharge capacities meets the second preset conditions, and if so, take the average value of the total discharge capacities as the actual SOC available capacity of the lithium battery of the vehicle to be detected, thereby determining the SOC accuracy of the lithium battery of the vehicle to be detected according to the display SOC available capacity and the actual SOC available capacity.
The verification method for the electric quantity of the lithium battery provided by the invention can be used for detecting the accuracy of the SOC at a preset temperature in consideration of the fact that the power consumption condition of a vehicle is different from that of the vehicle at normal temperature when the vehicle is used in different temperature environments. And heating the fully charged lithium battery of the vehicle to be detected at the first preset temperature, controlling the lithium battery of the vehicle to be detected to discharge until reaching a discharge cut-off condition when the current temperature of the lithium battery of the vehicle to be detected reaches a second preset value, acquiring relevant data of the lithium battery of the vehicle to be detected, and judging whether the relevant data meets a third preset condition or not so as to determine the SOC accuracy of the lithium battery of the vehicle to be detected. The relevant data include the discharge capacity of the lithium battery of the vehicle to be detected, the time spent every time the temperature rises, the actual SOC and the display SOC.
In addition, heating the lithium battery of the vehicle to be detected discharged to the discharge cut-off condition at a second preset temperature, controlling the lithium battery of the vehicle to be detected to charge until the charge cut-off condition is reached when the current temperature of the lithium battery of the vehicle to be detected reaches a third preset value, acquiring related data of the lithium battery of the vehicle to be detected, and judging whether the related data meets a fourth preset condition so as to determine the SOC accuracy of the lithium battery of the vehicle to be detected. The relevant data include the charge capacity of the lithium battery of the vehicle to be detected, the time spent every time the temperature rises, the actual SOC and the display SOC.
It should be noted that, the first preset temperature and the second preset temperature may be at any temperature, but in the actual use process of the vehicle, the influence of the low temperature on the lithium battery of the vehicle is large, so that the first preset temperature and the second preset temperature of the invention are both less than zero ℃.
In addition, it should be noted that the method for verifying the electric quantity of the lithium battery provided by the invention can be applied to verification of vehicle lithium batteries in the industrial field, and can be applied to verification of vehicle lithium batteries in other fields, and the method is not limited.
The method for verifying the electric quantity of the lithium battery provided by the embodiment of the invention comprises the following steps: and controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, and discharging until the display SOC of the battery reaches a first preset value in each discharging, wherein the first preset value is larger than zero, and the charging is not full except the first full charge, and the rest times are not full. When the number of discharging times reaches the first preset number of times, the battery is controlled to be completely discharged, the display SOC is reduced to zero from the first preset value at the moment, the time consumed by the display SOC reduced to zero from the first preset value is acquired, whether the consumed time meets the first preset condition is judged, and if the first preset condition is met, the SOC of the lithium battery of the vehicle to be detected can be determined to be accurate. Therefore, the technical scheme provided by the invention is that the lithium battery of the vehicle to be detected is circularly charged and discharged to simulate the condition of the vehicle in practical application, in addition, each discharge is not completely discharged and each charge is not fully charged to simulate the condition that the vehicle cannot be fully charged and discharged in practical use, the electric quantity of the battery is reduced to zero from a first preset value after multiple times of circulation to realize complete discharge, the time consumed by complete discharge is acquired, whether the consumed time meets the first preset condition is judged, if so, the SOC of the battery can be determined to be accurate, the error caused by the fact that the full charge is adopted to detect the SOC accuracy of the battery in the prior art is avoided, and the detection accuracy of the SOC is improved.
On the basis of the above embodiment, in order to further improve accuracy of detecting the SOC of the vehicle lithium battery, when the vehicle lithium battery detection device controls the vehicle lithium battery to be detected to perform cyclic charging and discharging, if the SOC is displayed to reach a first threshold value in the charging process and/or the SOC is displayed to reach a second threshold value in the discharging process, the vehicle lithium battery detection device controls the battery to perform correction, wherein the correction uses a combination of an ampere-hour integration method and kalman filtering to perform correction on the SOC of the actual battery. The ampere-hour integration method is to calculate the battery capacity by integrating the current with respect to time, then subtract the used part from the available capacity corresponding to the current temperature and the current in the database, and further obtain the remaining SOC of the battery, and when the SOC displayed by the battery of the vehicle to be detected in the cyclic charging and discharging processes meets the conditions, the Kalman filtering corrects the SOC of the battery by taking the voltage of the battery below as a correction point.
It can be understood that in the use process of the vehicle, the conditions of larger battery power consumption such as uphill, braking and the like exist, meanwhile, errors exist between the actual SOC and the display SOC easily, the SOC is not corrected for a long time, the errors are larger and larger, and the accuracy is low when the full charge and discharge mode is adopted to detect the SOC of the lithium battery of the vehicle. Therefore, in the verification method for the electric quantity of the lithium battery, when the vehicle lithium battery detection device controls the vehicle lithium battery to be detected to carry out cyclic charging and discharging, if the display SOC in the charging and discharging process meets the conditions, the vehicle lithium battery detection device controls the battery to carry out correction, that is, in the cyclic charging and discharging process, the actual use condition of the vehicle is simulated, in the charging process, if the display SOC reaches the first threshold value, the battery is corrected, for example, if the first threshold value is 90%, the display SOC in the charging process reaches 90%, and errors are possibly generated between the actual SOC and the display SOC due to larger power consumption of the vehicle in the actual use process and the braking process, and the actual SOC of the charging does not reach 90%, so that the actual SOC is the same as the display SOC of the vehicle lithium battery.
Similarly, when the vehicle lithium battery is discharged, for example, the second threshold value is 10%, if the actual SOC does not match the display SOC due to an error caused by actually using the vehicle when the charged display SOC reaches 10%, and if the display SOC reaches 10%, the vehicle lithium battery detection device corrects the battery so that the actual SOC and the display SOC are kept to match.
When the number of discharging times reaches the first preset number of times, the vehicle lithium battery detection device controls the battery to completely discharge, the current display SOC of the battery is reduced to zero, the consumed time of the battery to completely discharge is obtained, whether the consumed time meets the first preset condition is judged, and if the first preset condition is met, the SOC of the vehicle lithium battery to be detected is determined to be accurate. Notably, in order to ensure accuracy and reliability of the conclusion, the first preset condition is set to take time to be greater than the third threshold value and less than the fourth threshold value, for example, when it takes time to be greater than 20 minutes and less than 25 minutes, it is determined that the SOC of the lithium battery of the vehicle to be detected is accurate.
In the verification method for the electric quantity of the lithium battery, in the process of circularly charging and discharging the lithium battery of the vehicle to be detected, if the SOC meets the conditions in the charging and discharging processes, the actual SOC of the battery is controlled to be corrected, so that errors generated in the actual use process of the vehicle are corrected.
In particular embodiments, in addition to detecting the accuracy of the SOC of a vehicle lithium battery by cycling charging and discharging, the accuracy of the battery SOC may also be detected by detecting the available capacity of the SOC. The method comprises the steps of controlling a vehicle to be detected to be circularly charged and discharged to respective cut-off conditions by a vehicle lithium battery detection device, obtaining total discharge capacity and display SOC capacity of a battery each time in the process of circularly charging and discharging until the cycle times reach second preset times, judging whether a difference value between discharge capacities meets the second preset conditions, and taking a mean value of the total discharge capacities as an actual SOC usable capacity if the difference value meets the second preset conditions, wherein the actual SOC usable capacity is required to be obtained once, and the vehicle lithium battery detection device is required to discharge at a constant current speed when the battery is discharged. For ease of understanding, the following will exemplify.
For example, after the battery is charged to the charge stop condition, the preset time may be half an hour, 1 hour or a time specified by a manufacturer, which is not limited by the present invention, herein, the charging is completed and the vehicle lithium battery is left for half an hour, the vehicle lithium battery is discharged at a current speed of 0.5C until the discharge stop condition is reached, the total capacity C1 of the completed discharge is recorded, the actual SOC usable capacity of the vehicle lithium battery is obtained, then the charging is continued to the charge stop condition, the discharging is performed after the charge stop condition is obtained, the total discharge capacity C2 is obtained, the cyclic charging and the discharging are performed until the second preset number of times, for example, the second preset number of times is 3, if the difference between the three obtained total discharge capacities is C1, C2 and C3, for example, the difference between the C1, C2 and C3 is less than 5%, the preset condition is satisfied, or the difference is satisfied within a certain interval range, the SOC is not defined, and the present invention is not understood to be a percentage.
If the difference between C1, C2 and C3 satisfies the second preset condition, taking the average value of C1, C2 and C3 as the actual SOC available capacity, that is, the actual SOC available capacity=1/3 (c1+c2+c3), and finally determining whether the SOC of the vehicle to be detected is accurate according to whether the actual SOC available capacity and the display SOC available capacity are consistent, if so, the SOC is accurate, and if not, the SOC is inaccurate.
It is noted that if the difference between C1, C2 and C3 does not satisfy the second preset condition, indicating that there is an error in the currently acquired data, the vehicle to be detected is again circularly charged and discharged to acquire new three parameters until the error between the three parameters satisfies the second preset condition. Of course, it should also be noted that the method for testing the SOC usable capacity of the vehicle lithium battery provided in the present embodiment is only suitable for use at normal temperature.
According to the verification method for the electric quantity of the lithium battery, the vehicles to be detected are controlled to be circularly charged and discharged until the respective cut-off conditions are met and the cycle times reach the second preset times, in the cyclic charging and discharging process, the total discharging capacity and the display SOC available capacity of the lithium battery of each vehicle to be detected are obtained, whether the difference value of the total discharging capacities meets the second preset conditions or not is judged, if yes, the average value of the total discharging capacities is used as the actual SOC available capacity of the lithium battery of the vehicle to be detected, finally, the SOC accuracy of the lithium battery of the vehicle to be detected is determined according to the display SOC available capacity and the actual SOC available capacity, and therefore the SOC accuracy is further determined according to the SOC available capacity of the vehicle to be detected, and the reliability of detection results is improved.
It can be understood that in actual use of the vehicle, in addition to at normal temperature, in many cases, the error condition generated by the SOC of the battery is different when the vehicle is driven at low temperature and different from that of the vehicle at normal temperature, so that the method for verifying the electric quantity of the lithium battery according to the embodiment of the present invention further includes detecting at low temperature, and detecting the accuracy of the battery by detecting the discharge available capacity of the SOC of the lithium battery of the vehicle at low temperature.
And heating the fully charged lithium battery of the vehicle to be detected at the first preset temperature, wherein the heating process is equivalent to a discharging process, and when the current temperature of the lithium battery of the vehicle to be detected reaches a second preset value, the lithium battery of the vehicle to be detected is controlled to discharge until reaching a discharge cut-off condition. At this time, the relevant data of the lithium battery of the vehicle to be detected is obtained, and whether the relevant data meets a third preset condition is judged so as to determine the accuracy of the SOC of the lithium battery of the vehicle to be detected. The related data comprise the discharge capacity, the charge capacity, the time spent for every one-degree increase of the temperature of the lithium battery of the vehicle to be detected, the actual SOC and the display SOC. For ease of understanding, the following examples are explained.
For example, the first preset temperature is-20 degrees centigrade (deg.c), the vehicle lithium battery to be detected is placed in an incubator with the temperature of-20 degrees centigrade, when the temperature deviation in the incubator is within 2 degrees centigrade, the vehicle lithium battery detection device is used for fully charging the battery of the vehicle to be detected, and after fully charging, the vehicle lithium battery detection device is used for carrying out pure heating on the vehicle lithium battery, and it can be understood that the pure heating is a discharging process, the current time of every rise of the temperature of the vehicle lithium battery is obtained to obtain the time consumed by every rise of the temperature, and the actual SOC and the display SOC are obtained. When the current temperature of the vehicle lithium battery reaches a second preset value, for example, the second preset value is-10 ℃, namely, when the temperature of the vehicle lithium battery reaches-10 ℃, the vehicle lithium battery is controlled to discharge, the discharge is started until a discharge cut-off condition is reached, and the discharge capacity of the primary battery is obtained when the display SOC of the battery changes by 5%. At this time, if the time spent by each rise of the battery temperature below minus 10 ℃ is not more than 8 minutes, the deviation between the actual SOC and the display SOC is within 5% in the whole process, and the total SOC discharge capacity of the lithium battery of the vehicle to be detected, which is obtained at minus 20 ℃, is greater than 70% of the SOC usable capacity of the battery at normal temperature, the SOC of the vehicle to be detected is determined to be accurate. It should be noted that a temperature sensor is provided near or on the vehicle lithium battery to obtain the current temperature of the vehicle lithium battery to be detected.
In addition, according to the verification method for the electric quantity of the lithium battery, the accuracy of the battery SOC can be detected by obtaining the discharge available capacity of the lithium battery SOC of the vehicle under the condition of low temperature, namely, the lithium battery of the vehicle to be detected which is discharged to the discharge cut-off condition is heated at the second preset temperature, and when the current temperature of the lithium battery of the vehicle to be detected reaches the third preset value, the lithium battery of the vehicle to be detected is controlled to be charged until the charge cut-off condition is reached. At this time, the relevant data of the lithium battery of the vehicle to be detected is obtained, and whether the relevant data meets a fourth preset condition is judged so as to determine the accuracy of the SOC of the lithium battery of the vehicle to be detected. Also, for ease of understanding, the following examples are explained.
For example, the second preset temperature is-10 ℃, the lithium battery of the vehicle to be detected is firstly discharged at normal temperature until the discharge cut-off condition is reached, then the lithium battery of the vehicle to be detected is placed in an incubator with the temperature of-10 ℃, when the temperature deviation in the incubator is within 2 ℃, the battery of the vehicle to be detected is charged through the vehicle lithium battery detection device, the temperature of the battery rises in the charging process, the current time of every rise of the temperature of the lithium battery of the vehicle is acquired to acquire the time consumed by every rise of the temperature, and the actual SOC and the display SOC are acquired.
When the current temperature of the lithium battery of the vehicle to be detected reaches a third preset value, for example, reaches 0 ℃, the battery is continuously charged until the charge cut-off condition is reached, and when the display SOC of the battery changes by 5%, the discharge capacity of the primary battery is obtained. At this time, if the time taken for raising the battery temperature below 0 ℃ by 1 ℃ is not more than 8 minutes, the deviation between the actual SOC and the display SOC is within 5% in the whole process, and the SOC charge capacity of the lithium battery of the vehicle to be detected obtained at-10 ℃ is greater than 70% of the SOC usable capacity of the battery at normal temperature, the SOC of the vehicle to be detected is determined to be accurate.
It is noted that the present application is not limited to the first preset temperature and the second preset temperature, but the first preset temperature and the second preset temperature are both less than 0 ℃.
According to the verification method for the electric quantity of the lithium battery, provided by the embodiment of the application, whether the SOC of the battery is accurate is determined by acquiring and judging whether the related data of the battery of the vehicle to be detected meets the preset condition under the low temperature condition, so that the reliability of the detection result is further improved.
In the above embodiments, the method for verifying the electric quantity of the lithium battery is described in detail, and the application also provides a corresponding embodiment of the device for verifying the electric quantity of the lithium battery. It should be noted that the present application describes an embodiment of the device portion from two angles, one based on the angle of the functional module and the other based on the angle of the hardware structure.
Fig. 2 is a block diagram of a device for verifying electric quantity of a lithium battery according to an embodiment of the present invention, as shown in fig. 2, the device includes:
the first control module 10 is configured to control the vehicle lithium battery to be detected to perform cyclic charging and discharging until the number of discharging times reaches a first preset number, where each discharging is performed until the display SOC of the vehicle lithium battery to be detected reaches a first preset value, and the first preset value is greater than zero, and the charging is not full except for the first full charge.
And the second control module 11 is used for controlling the lithium battery of the vehicle to be detected to be completely discharged when the discharge times reach the first preset times so as to display that the SOC is reduced to zero from the first preset value.
An obtaining module 12 is configured to obtain a time elapsed for displaying that the SOC is reduced from the first preset value to zero.
The judging module 13 is configured to judge whether the elapsed time meets a first preset condition, and if the elapsed time meets the first preset condition, determine that the SOC of the lithium battery of the vehicle to be detected is accurate.
Since the embodiments of the apparatus portion and the embodiments of the method portion correspond to each other, the embodiments of the apparatus portion are referred to the description of the embodiments of the method portion, and are not repeated herein.
The device for verifying the electric quantity of the lithium battery provided by the embodiment of the invention comprises the following components: and controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, and discharging until the display SOC of the battery reaches a first preset value in each discharging, wherein the first preset value is larger than zero, and the charging is not full except the first full charge, and the rest times are not full. When the number of discharging times reaches the first preset number of times, the battery is controlled to be completely discharged, the display SOC is reduced to zero from the first preset value at the moment, the time consumed by the display SOC reduced to zero from the first preset value is acquired, whether the consumed time meets the first preset condition is judged, and if the first preset condition is met, the SOC of the lithium battery of the vehicle to be detected can be determined to be accurate. Therefore, the technical scheme provided by the invention is that the lithium battery of the vehicle to be detected is circularly charged and discharged to simulate the condition of the vehicle in practical application, in addition, each discharge is not completely discharged and each charge is not fully charged to simulate the condition that the vehicle cannot be fully charged and discharged in practical use, the electric quantity of the battery is reduced to zero from a first preset value after multiple times of circulation to realize complete discharge, the time consumed by complete discharge is acquired, whether the consumed time meets the first preset condition is judged, if so, the SOC of the battery can be determined to be accurate, the error caused by the fact that the full charge is adopted to detect the SOC accuracy of the battery in the prior art is avoided, and the detection accuracy of the SOC is improved.
Fig. 3 is a block diagram of a device for verifying electric quantity of a lithium battery according to another embodiment of the present invention, where, as shown in fig. 3, the device for verifying electric quantity of a lithium battery includes: a memory 20 for storing a computer program;
a processor 21 for implementing the steps of the method for verifying the charge of a lithium battery as mentioned in the above embodiments when executing a computer program.
The verification device for the lithium battery electric quantity provided by the embodiment can include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer or the like.
Processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in hardware in at least one of a digital signal processor (Digital Signal Processor, abbreviated as DSP), a Field programmable gate array (Field-Programmable Gate Array, abbreviated as FPGA), and a programmable logic array (Programmable Logic Array, abbreviated as PLA). The processor 21 may also include a main processor and a coprocessor, the main processor being a processor for processing data in an awake state, also referred to as a central processor (Central Processing Unit, CPU for short); a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 may integrate with an image processor (Graphics Processing Unit, GPU for short) for rendering and drawing of the content required to be displayed by the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 20 may include one or more computer-readable storage media, which may be non-transitory. Memory 20 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used for storing a computer program 201, where the computer program, when loaded and executed by the processor 21, can implement the relevant steps of the method for verifying the lithium battery power disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may further include an operating system 202, data 203, and the like, where the storage manner may be transient storage or permanent storage. The operating system 202 may include Windows, unix, linux, among others. The data 203 may include, but is not limited to, related data involved in a method of verifying the charge of a lithium battery, and the like.
In some embodiments, the verification device for lithium battery power may further include a display 22, an input/output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.
It will be appreciated by those skilled in the art that the configuration shown in fig. 3 does not constitute a limitation of the verification means of the lithium battery charge, and may include more or less components than those illustrated.
The verification device for the lithium battery electric quantity provided by the embodiment of the application comprises a memory and a processor, wherein the processor can realize the following method when executing a program stored in the memory: a method for verifying the electric quantity of a lithium battery.
According to the verification device for the electric quantity of the lithium battery, the lithium battery of the vehicle to be detected is circularly charged and discharged to simulate the situation of the vehicle in practical application, in addition, each discharge is not completely discharged and each charge is not fully charged to simulate the situation that the vehicle cannot be fully charged and discharged in practical use, the electric quantity of the battery is reduced to zero from a first preset value after multiple times of circulation to achieve complete discharge, the time consumed by complete discharge is acquired, whether the consumed time meets the first preset condition is judged, if yes, the SOC of the battery can be determined to be accurate, errors caused when the SOC accuracy of the battery is detected by adopting the full charge and discharge in the traditional method are avoided, and the detection accuracy of the SOC is improved.
Finally, the application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps as described in the method embodiments above.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium for performing all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The method, the device and the medium for verifying the electric quantity of the lithium battery provided by the application are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. The method for verifying the electric quantity of the lithium battery is characterized by comprising the following steps of:
controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, wherein each discharging is carried out until the display SOC of the lithium battery of the vehicle to be detected reaches a first preset value, the first preset value is larger than zero, and the charging times are not full except the first full charge;
When the discharging times reach the first preset times, controlling the lithium battery of the vehicle to be detected to be completely discharged so that the display SOC is reduced to zero from the first preset value;
acquiring the time consumption of the display SOC reduced to zero from the first preset value;
judging whether the consumed time meets a first preset condition, and if so, determining that the SOC of the lithium battery of the vehicle to be detected is accurate.
2. The method for verifying the charge of a lithium battery according to claim 1, wherein controlling the vehicle lithium battery to be detected to be cyclically charged and discharged comprises:
and when the vehicle lithium battery to be detected charges and the display SOC reaches a first threshold value, and/or when the vehicle lithium battery to be detected discharges and the display SOC reaches a second threshold value, correcting the actual SOC of the vehicle lithium battery to be detected.
3. The method according to claim 1, wherein the first preset condition is that the elapsed time is greater than a third threshold and less than a fourth threshold.
4. The method for verifying the charge of a lithium battery of claim 1, further comprising:
Controlling the lithium battery of the vehicle to be detected to be circularly charged and discharged to respective cut-off conditions, and enabling the cycle times to reach a second preset times;
acquiring the total discharge capacity of the lithium battery of the vehicle to be detected and the available capacity of the display SOC each time;
judging whether the difference value of the total discharge capacity meets a second preset condition, and if so, taking the average value of the total discharge capacity as the actual SOC available capacity of the lithium battery of the vehicle to be detected;
and determining the SOC accuracy of the lithium battery of the vehicle to be detected according to the display SOC available capacity and the actual SOC available capacity.
5. The method for verifying the charge of a lithium battery of claim 4, further comprising:
heating the fully charged lithium battery of the vehicle to be detected at a first preset temperature;
when the current temperature of the lithium battery of the vehicle to be detected reaches a second preset value, controlling the lithium battery of the vehicle to be detected to discharge until reaching a discharge cut-off condition;
acquiring relevant data of the lithium battery of the vehicle to be detected; the related data comprise the discharge capacity of the lithium battery of the vehicle to be detected, the time consumed by each one-degree increase of the temperature, the actual SOC and the display SOC;
And judging whether the related data meets a third preset condition or not so as to determine the SOC accuracy of the lithium battery of the vehicle to be detected.
6. The method for verifying the charge of a lithium battery of claim 4, further comprising:
heating the lithium battery of the vehicle to be detected discharged to a discharge cut-off condition at a second preset temperature;
when the current temperature of the lithium battery of the vehicle to be detected reaches a third preset value, controlling the lithium battery of the vehicle to be detected to charge until a charge stop condition is reached;
acquiring relevant data of the lithium battery of the vehicle to be detected; the related data comprise the charging capacity of the lithium battery of the vehicle to be detected, the time consumed by each one-degree increase of the temperature, the actual SOC and the display SOC;
and judging whether the related data meets a fourth preset condition so as to determine the SOC accuracy of the lithium battery of the vehicle to be detected.
7. A verification device for lithium battery power, comprising:
the first control module is used for controlling the lithium battery of the vehicle to be detected to carry out cyclic charging and discharging until the discharging times reach a first preset times, wherein each discharging is carried out until the display SOC of the lithium battery of the vehicle to be detected reaches a first preset value, the first preset value is larger than zero, and the charging times are not full except the first full charge;
The second control module is used for controlling the lithium battery of the vehicle to be detected to be completely discharged when the discharging times reach the first preset times so that the display SOC is reduced to zero from the first preset value;
an acquisition module, configured to acquire a time taken for the display SOC to decrease from the first preset value to zero;
the judging module is used for judging whether the consumed time meets a first preset condition, and if the consumed time meets the first preset condition, determining that the SOC of the lithium battery of the vehicle to be detected is accurate.
8. The verification device for the electric quantity of the lithium battery is characterized by comprising a memory, a storage unit and a verification unit, wherein the memory is used for storing a computer program;
a processor for implementing the steps of the method for verifying the electric quantity of a lithium battery according to any one of claims 1 to 6 when executing the computer program.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method for verifying the charge of a lithium battery as defined in any one of claims 1 to 6.
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