CN117406106A - Safety monitoring system based on shunt - Google Patents
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 68
- 238000012360 testing method Methods 0.000 claims description 35
- 238000012545 processing Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 20
- 238000001514 detection method Methods 0.000 abstract description 9
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- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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Abstract
The invention discloses a safety monitoring system based on a shunt, which relates to the technical field of safety monitoring of battery packs, and solves the problems that an abnormal operation state of a battery pack cannot be confirmed in time, an abnormal signal is generated, an external person performs intervention detection to determine the operation process of the battery pack, the detection process of the battery pack is incomplete, and the overall detection effect is poor.
Description
Technical Field
The invention relates to the technical field of battery pack safety monitoring, in particular to a safety monitoring system based on a current divider.
Background
The current divider is mainly used for measuring the voltage, the current and the temperature of the battery cell and the voltage of the battery pack, and then transmitting the signals to the operation module for processing and sending out instructions; and these instructions will be displayed by the hardware, base software, runtime environment and application software of the control module.
Patent publication number CN113328477a relates to a battery pack management system, a battery pack, a vehicle, and a management method. A method for dynamically managing parallel operation of a plurality of battery packs, which is applied to a first battery pack, the method comprising: the BMS monitors the states of a first battery pack and other battery packs, wherein the states of the first battery pack and other battery packs comprise a disconnection state and a connection state; the BMS judges that when the difference value between the electric quantity of the first battery pack and the electric quantity of other battery packs in a connection state is in a preset threshold range, based on the judgment, the first battery pack is controlled to be switched from the disconnection state to the connection state, and the first battery pack and the other battery packs are connected in parallel; wherein the connection state includes a charge state and a discharge state, the first battery pack being charged in the charge state and discharged in the discharge state.
In the normal use charging and discharging process of the battery pack, the internal voltage or current is required to be monitored by adopting a current divider, and the running state of the battery pack is analyzed according to the monitoring parameters, but the original mode can not confirm the abnormal running state of the battery pack in time, but generates an abnormal signal, and an external person performs intervention detection to determine the running process of the battery pack, so that the detection process of the battery pack is not comprehensive, and the overall detection effect is poor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a safety monitoring system based on a shunt, which solves the problems that the abnormal operation state of a battery pack cannot be confirmed in time, an abnormal signal is generated, and an external person performs intervention detection to determine the operation process of the battery pack, so that the detection process of the battery pack is incomplete and the overall detection effect is poor.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a shunt-based safety monitoring system, comprising:
the numerical value monitoring end monitors the working numerical value in the battery pack, compares the monitored working numerical value with a preset interval in the database, when the comparison result is abnormal, represents the abnormal working of the battery pack, generates a battery pack abnormal signal, and transmits the battery pack abnormal signal to the shunt monitoring end, wherein the specific mode is as follows:
the different working values in the battery pack are marked as Z i Wherein i represents different working values, and a preset interval corresponding to the corresponding working value is extracted from the database and is calibrated as Q i ；
When all Z is monitored i ∈Q i When the method is used, no treatment is carried out, monitoring is continued, otherwise, generating a battery pack abnormal signal and transmitting the signal to a shunt monitoring end;
the shunt monitoring end defines a group of monitoring periods T, monitors voltage parameters and current parameters of corresponding battery packs in the monitoring periods T, and transmits various monitored parameters to the numerical analysis end;
the numerical analysis end receives the monitored various parameters, draws a fluctuation curve of the corresponding parameters changing along with time, and then comprehensively analyzes the drawn fluctuation curve to judge whether the battery pack has a real abnormal working condition or not, wherein the specific mode is as follows:
determining voltage parameters generated at different time points in the monitoring period T, then constructing a voltage fluctuation curve according to the time trend, determining current parameters generated at different time points, and constructing a current fluctuation curve according to the time trend;
determining the trend of line segments between different time periods by taking a voltage fluctuation curve as a reference, when the line segments climb in the corresponding time period, assigning 1, when the line segments descend, assigning 0, when the line segments are stable, assigning 2, determining the same interval in the current fluctuation curve in the determined time period, comparing trend, if a descending line segment or a stable line segment exists in the region assigned 1, directly calibrating the region as an abnormal line segment, and similarly, if a trend line segment which is different from the region assigned 0 or the region assigned 2 exists, directly calibrating the region as an abnormal line segment;
recording the length L1 of the abnormal line segment, recording the length L2 of the current fluctuation curve, determining the occupation ratio ZB of the abnormal line segment by adopting L1/L2=ZB, and then determining whether the occupation ratio ZB meets the following conditions: ZB is larger than Y1, wherein Y1 is a preset value, if yes, the battery pack is abnormal, an abnormal signal is directly generated, the battery pack is marked as an abnormal battery pack through a marking end, and if not, the next analysis processing is carried out;
receiving the abnormal line segment, determining the corresponding line segment in the voltage fluctuation curve according to the time period, drawing the line segment as a standard line segment, determining the slopes of different adjacent points in the standard line segment, and marking the slope as X k Wherein k represents different adjacent points in the standard line segment, and the slopes of the different adjacent points in the abnormal line segment are determined in the same way and marked as L t Wherein t represents different adjacent points in the abnormal line segment;
recording the maximum difference value of the slopes between the corresponding line segments from the standard line segments corresponding to the abnormal line segments, calibrating the maximum difference value as CZmax, and determining whether the maximum difference value CZmax meets the following conditions: CZmax > Y2, wherein Y2 is a preset value, if yes, the representing difference is too large, representing that the battery pack is abnormal, directly generating an abnormal signal, marking the battery pack as an abnormal battery pack through a marking end, if not, marking the battery pack as a suboptimal battery pack through the marking end, and carrying out limit test processing through a subsequent limit test end
The limit test end carries out limit test processing on the calibrated sub-optimal battery pack, carries out periodic charge and discharge test, records battery capacity when the period is finished, and judges whether the sub-optimal battery pack affects normal use according to the change of battery capacity values or not, wherein the specific mode is as follows:
recording the battery capacity before the limit test of the sub-optimal battery pack, calibrating the battery capacity to be RL1, maintaining the internal electric quantity of the sub-optimal battery pack to be half of the total capacity before the limit test, defining a group of charging periods Z1, carrying out charging treatment on the sub-optimal battery pack, defining a group of discharging periods Z2 after the charging is finished, and carrying out discharging treatment on the sub-optimal battery pack, wherein Z1=Z2;
sequentially subjecting the suboptimal battery pack to three charging periods and discharging periods, and after the sequential treatment is completed, recording the battery capacity after the test treatment and calibrating the battery capacity as RL2;
obtaining a check value BD between two battery capacities using bd= |rl1-RL2|, and determining whether the check value BD satisfies: BD is larger than Y3, wherein Y3 is a preset value, if yes, the best battery pack can not be normally used, and an unusable signal is generated and displayed, and if not, the best battery pack can be normally used, and an usable signal is generated and displayed.
Advantageous effects
The invention provides a safety monitoring system based on a shunt. Compared with the prior art, the method has the following beneficial effects:
the invention determines the working parameters of the battery pack, subsequently, identifies the working voltage and the working current from the determined working parameters, performs periodic analysis, confirms trend between the voltage curve and the current curve, marks line segments with overlarge phase difference between trend line segments as abnormal line segments, thereby determining the battery pack in an abnormal state, and performs comprehensive judgment by analyzing the generated abnormal line segments and the maximum difference value of the trend between the abnormal line segments, and locks the working state of the battery pack through the judgment result, thereby displaying and improving the comprehensiveness of the monitoring process;
in the testing process, the normal use state of the corresponding battery pack is considered, if the battery pack which is relatively poor in performance in the monitoring process is directly used, the subsequent use effect is poor due to the instability of the internal devices, so that the capacity change of the corresponding battery pack is analyzed through limit testing, comprehensive judgment is carried out according to specific change parameters, whether the battery pack can be normally used is determined, and the comprehensiveness of the analysis judgment of the battery pack is improved.
Drawings
FIG. 1 is a schematic diagram of a principal frame of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the current divider of the present invention.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, the present application provides a safety monitoring system based on a shunt, which includes a database, a numerical monitoring end, a shunt monitoring end, a numerical analysis end, a marking end and a limit testing end;
the data base is electrically connected with the input node of the numerical monitoring end, the numerical monitoring end is electrically connected with the input node of the shunt monitoring end, the shunt monitoring end is electrically connected with the input node of the numerical analysis end, the numerical analysis end is electrically connected with the input node of the marking end, and the marking end is electrically connected with the input node of the limit testing end;
the numerical value monitoring end monitors the working numerical value inside the battery pack, compares the monitored working numerical value with a preset interval in the database, when the comparison result is abnormal, represents that the battery pack works abnormally, generates a battery pack abnormal signal, and transmits the battery pack abnormal signal to the shunt monitoring end, wherein the comparison mode is as follows:
the different working values in the battery pack are marked as Z i Wherein i represents different working values, and a preset interval corresponding to the corresponding working value is extracted from the database and is calibrated as Q i ；
When all Z is monitored i ∈Q i When the method is used, no treatment is carried out, monitoring is continued, otherwise, generating a battery pack abnormal signal and transmitting the signal to a shunt monitoring end;
specifically, during normal operation of the battery pack, a large number of working values are generated, the working values are changed along with time, the working values are generally parameters such as voltage, current and temperature, and whether the battery pack has abnormal operation or not can be identified according to the parameters and the corresponding preset intervals.
The shunt monitoring end defines a group of monitoring periods T, monitors voltage parameters and current parameters of corresponding battery packs in the monitoring periods T, and transmits various monitored parameters to the numerical analysis end;
the numerical analysis end receives the monitored various parameters, draws a fluctuation curve of the corresponding parameters changing along with time, and then comprehensively analyzes the drawn fluctuation curve to judge whether the battery pack has a real abnormal working condition, wherein the specific mode for carrying out the comprehensive analysis is as follows:
determining voltage parameters generated at different time points in the monitoring period T, then constructing a voltage fluctuation curve according to the time trend, determining current parameters generated at different time points, and constructing a current fluctuation curve according to the time trend;
determining the trend of line segments between different time periods by taking a voltage fluctuation curve as a reference, when the line segments climb in the corresponding time period, assigning 1, when the line segments descend, assigning 0, when the line segments are stable, assigning 2, determining the same interval in the current fluctuation curve in the determined time period, comparing trend, if a descending line segment or a stable line segment exists in the region assigned 1, directly calibrating the region as an abnormal line segment, and similarly, if a trend line segment which is different from the region assigned 0 or the region assigned 2 exists, directly calibrating the region as an abnormal line segment;
recording the length L1 of the abnormal line segment, recording the length L2 of the current fluctuation curve, determining the occupation ratio ZB of the abnormal line segment by adopting L1/L2=ZB, and then determining whether the occupation ratio ZB meets the following conditions: ZB is larger than Y1, wherein Y1 is a preset value, the specific value is determined by an operator according to experience, if the specific value is satisfied, the abnormal signal is directly generated and marked as an abnormal battery pack through a marking end, and if the specific value is not satisfied, the next analysis processing is carried out;
receiving the abnormal line segment, determining the corresponding line segment in the voltage fluctuation curve according to the time period, drawing the line segment as a standard line segment, determining the slopes of different adjacent points in the standard line segment, and marking the slope as X k Wherein k represents different adjacent points in the standard line segment, and the slopes of the different adjacent points in the abnormal line segment are determined in the same way and marked as L t Wherein t represents different adjacent points in the abnormal line segment;
recording the maximum difference value of the slopes between the corresponding line segments from the standard line segments corresponding to the abnormal line segments, calibrating the maximum difference value as CZmax, and determining whether the maximum difference value CZmax meets the following conditions: CZmax > Y2, wherein Y2 is a preset value, the specific value is determined by an operator according to experience, if the specific value is satisfied, the representative difference value is too large, the abnormal signal is directly generated, the battery pack is marked as an abnormal battery pack through a marking end, if the specific value is not satisfied, the battery pack is marked as a suboptimal battery pack through the marking end, and the limit test processing is carried out through a subsequent limit test end.
Specifically, in the normal operation process of the battery pack, normal working voltage and working current can be generated, when the working voltage of the battery pack rises, the working current can also be in a rising state in a normal state, if the working current is not in the rising state, the working state of the battery pack is abnormal, comprehensive analysis is needed for the battery pack in the abnormal working state to judge whether the battery pack is in the abnormal state, comprehensive judgment is carried out by analyzing the generated abnormal line segments and the trend maximum difference value between the abnormal line segments, and the working state of the battery pack is locked by the judging result, so that the display is carried out and the comprehensiveness of the monitoring process of the battery pack is improved.
Example two
In the specific implementation process, compared with the first embodiment, the main difference of the embodiment is that the limit test processing work is performed on the sub-optimal battery pack, the limit test processing result is displayed, and whether the sub-optimal battery pack affects the subsequent normal use is determined;
the limit test end performs limit test processing on the calibrated sub-optimal battery pack, performs periodic charge and discharge test, records battery capacity when the period is finished, and judges whether the sub-optimal battery pack affects normal use according to the change of the battery capacity value, wherein the specific mode of performing the limit test processing is as follows:
recording the battery capacity before the limit test of the sub-optimal battery pack, calibrating the battery capacity to be RL1, maintaining the internal electric quantity of the sub-optimal battery pack to be half of the total capacity before the limit test, defining a group of charging periods Z1, carrying out charging treatment on the sub-optimal battery pack, defining a group of discharging periods Z2 after the charging is finished, and carrying out discharging treatment on the sub-optimal battery pack, wherein Z1=Z2;
sequentially subjecting the suboptimal battery pack to three charging periods and discharging periods, and after the sequential treatment is completed, recording the battery capacity after the test treatment and calibrating the battery capacity as RL2;
obtaining a check value BD between two battery capacities using bd= |rl1-RL2|, and determining whether the check value BD satisfies: BD is larger than Y3, wherein Y3 is a preset value, the specific value is determined by an operator according to experience, if the specific value is satisfied, the specific value represents that the optimal battery pack can not be normally used, an unavailable signal is generated and displayed, and if the specific value is not satisfied, the specific value represents that the optimal battery pack can be normally used, and an available signal is generated and displayed;
specifically, in the testing process, the normal use state of the corresponding battery pack needs to be considered, if the battery pack which is relatively poor in performance in the monitoring process is directly used, the subsequent use effect is poor due to the instability of the internal devices, so that the capacity change of the corresponding battery pack is analyzed through the limit test, the comprehensive judgment is carried out according to the specific change parameters, whether the battery pack can be used normally is determined, and the comprehensiveness of the analysis judgment of the battery pack is improved.
Example III
This embodiment includes all of the implementations of the two sets of embodiments described above.
Example IV
The application also includes a shunt corresponding to the use process, as shown in fig. 2;
the current divider is used for assisting in measuring bidirectional direct current, has high precision, low temperature drift, low inductance, low thermal potential, excellent long-term stability and anti-interference capability, is designed based on the low temperature drift current divider, is formed by welding the current divider and PCBA+SMT, can meet the requirement of automobile function safety checking, can be arranged on a circuit to be measured through bolts, is used for collecting bus current and current divider temperature, connects measured signals to a signal processing side of a user-defined module, and can be subjected to customized design according to specific technical requirements of clients;
and the limit parameter worksheet of the shunt is as follows:
| parameters (parameters) | Conditions (conditions) | Minimum value | Typical value | Maximum value | Unit (B) |
| Measuring current | ±1000 | 5 | s | ||
| Operating temperature | -40 | 155 | ℃ | ||
| Storage temperature | -40 | 155 | ℃ | ||
| Humidity of the water | 95 | ％RH |
And the storage requirements of the diverter are as follows:
the storage temperature is 15-35 ℃, the storage humidity is 40-60% RH, and the storage height H is less than 2m;
the storage environment should be clean, dry and free of harmful gases;
the packaging box is prevented from being in direct sunlight environment;
suggesting that the storage time length T of the finished product is less than or equal to 12 months;
when the anti-static hand ring or the anti-static glove is installed, stored, taken and placed, the anti-static hand ring or the anti-static glove is required to be worn.
Some of the data in the above formulas are numerical calculated by removing their dimensionality, and the contents not described in detail in the present specification are all well known in the prior art.
The above embodiments are only for illustrating the technical method of the present invention and not for limiting the same, and it should be understood by those skilled in the art that the technical method of the present invention may be modified or substituted without departing from the spirit and scope of the technical method of the present invention.
Claims (5)
1. A diverter-based safety monitoring system, comprising:
the numerical value monitoring end is used for monitoring the working numerical value in the battery pack, comparing the monitored working numerical value with a preset interval in the database, and when the comparison result is abnormal, representing that the battery pack is abnormal in working, generating a battery pack abnormal signal and transmitting the battery pack abnormal signal to the shunt monitoring end;
the shunt monitoring end defines a group of monitoring periods T, monitors voltage parameters and current parameters of corresponding battery packs in the monitoring periods T, and transmits various monitored parameters to the numerical analysis end;
the numerical analysis end receives the monitored various parameters, draws a fluctuation curve of the corresponding parameters changing along with time, and then comprehensively analyzes the drawn fluctuation curve to judge whether the battery pack has real abnormal working conditions;
and the limit test end performs limit test processing on the calibrated sub-optimal battery pack, performs periodic charge and discharge test, records the battery capacity when the period is finished, and judges whether the sub-optimal battery pack affects normal use according to the change of the battery capacity value.
2. The shunt-based safety monitoring system according to claim 1, wherein the specific way for the numerical monitoring end to compare the monitored working numerical value with the preset interval in the database is as follows:
the different working values in the battery pack are marked as Z i Wherein i represents different working values, and a preset interval corresponding to the corresponding working value is extracted from the database and is calibrated as Q i ；
When all Z is monitored i ∈Q i And if not, generating a battery pack abnormal signal and transmitting the signal to the shunt monitoring terminal.
3. The shunt-based safety monitoring system according to claim 1, wherein the numerical analysis end performs comprehensive analysis on the drawn fluctuation curve by:
determining voltage parameters generated at different time points in the monitoring period T, then constructing a voltage fluctuation curve according to the time trend, determining current parameters generated at different time points, and constructing a current fluctuation curve according to the time trend;
determining the trend of line segments between different time periods by taking a voltage fluctuation curve as a reference, when the line segments climb in the corresponding time period, assigning 1, when the line segments descend, assigning 0, when the line segments are stable, assigning 2, determining the same interval in the current fluctuation curve in the determined time period, comparing trend, if a descending line segment or a stable line segment exists in the region assigned 1, directly calibrating the region as an abnormal line segment, and similarly, if a trend line segment which is different from the region assigned 0 or the region assigned 2 exists, directly calibrating the region as an abnormal line segment;
recording the length L1 of the abnormal line segment, recording the length L2 of the current fluctuation curve, determining the occupation ratio ZB of the abnormal line segment by adopting L1/L2=ZB, and then determining whether the occupation ratio ZB meets the following conditions: ZB is larger than Y1, wherein Y1 is a preset value, if yes, an abnormal signal is directly generated and marked as an abnormal battery pack through a marking end, and if not, the battery pack is analyzed and processed in the next step.
4. A diverter-based safety monitoring system as recited in claim 3, wherein said numerical analysis end further comprises:
receiving the abnormal line segment, determining the corresponding line segment in the voltage fluctuation curve according to the time period, drawing the line segment as a standard line segment, determining the slopes of different adjacent points in the standard line segment, and marking the slope as X k Wherein k represents different adjacent points in the standard line segment, and the same way is adopted for different pointsThe slopes of different adjacent points in the normal line segment are determined and marked as L t Wherein t represents different adjacent points in the abnormal line segment;
recording the maximum difference value of the slopes between the corresponding line segments from the standard line segments corresponding to the abnormal line segments, calibrating the maximum difference value as CZmax, and determining whether the maximum difference value CZmax meets the following conditions: CZmax > Y2, wherein Y2 is a preset value, if yes, represent that the difference is too large, represent that this battery pack is unusual, directly produce the unusual signal, and mark this battery pack as the unusual battery pack through the mark end, if not, represent that this battery pack is bad in performance, mark this battery pack as the suboptimal battery pack through the mark end, and carry out limit test processing through the subsequent limit test end.
5. The shunt-based safety monitoring system according to claim 1, wherein the limiting test terminal performs limiting test processing in the following specific manner:
recording the battery capacity before the limit test of the sub-optimal battery pack, calibrating the battery capacity to be RL1, maintaining the internal electric quantity of the sub-optimal battery pack to be half of the total capacity before the limit test, defining a group of charging periods Z1, carrying out charging treatment on the sub-optimal battery pack, defining a group of discharging periods Z2 after the charging is finished, and carrying out discharging treatment on the sub-optimal battery pack, wherein Z1=Z2;
sequentially subjecting the suboptimal battery pack to three charging periods and discharging periods, and after the sequential treatment is completed, recording the battery capacity after the test treatment and calibrating the battery capacity as RL2;
obtaining a check value BD between two battery capacities using bd= |rl1-RL2|, and determining whether the check value BD satisfies: BD is larger than Y3, wherein Y3 is a preset value, if yes, the best battery pack can not be normally used, and an unusable signal is generated and displayed, and if not, the best battery pack can be normally used, and an usable signal is generated and displayed.
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| CN117825899B (en) * | 2024-03-06 | 2024-05-10 | 江苏丹通电气有限公司 | Insulation state monitoring method for capacitor bank |
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