CN116653602A - Power battery system and heating system abnormality diagnosis method thereof - Google Patents
Power battery system and heating system abnormality diagnosis method thereof Download PDFInfo
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- CN116653602A CN116653602A CN202211441778.7A CN202211441778A CN116653602A CN 116653602 A CN116653602 A CN 116653602A CN 202211441778 A CN202211441778 A CN 202211441778A CN 116653602 A CN116653602 A CN 116653602A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000005856 abnormality Effects 0.000 title claims abstract description 23
- 238000003745 diagnosis Methods 0.000 title abstract description 8
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 238000007600 charging Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010277 constant-current charging Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the field of power batteries of electric automobiles, and discloses a power battery system and a heating system abnormality diagnosis method thereof, wherein when the current state of the whole automobile is stable, the actual current value of the heating system of the whole automobile is obtained by utilizing the current difference of the whole automobile before and after the heating relay is closed; comparing the actual current value with a theoretical current range of the heating system, and if the actual current value exceeds the theoretical current range, making the heating system abnormal; the theoretical current range is calculated according to the number of single battery cores corresponding to each heating branch, the heating voltage range corresponding to the single battery core and the total resistance value of each heating branch. The effectiveness and the accuracy of the abnormality diagnosis of the heating system are improved, misjudgment caused by the problems of long temperature judgment time, uneven temperature distribution and the like is avoided, the advance of the abnormality judgment of the heating system is improved, and the judgment is not needed to be carried out through the whole temperature rise of the power battery.
Description
Technical Field
The invention relates to the field of power batteries of electric automobiles, in particular to a power battery system and a heating system diagnosis method thereof.
Background
The power battery is used as a power and energy storage unit of a new energy vehicle, the proper working temperature is 20-45 ℃, and the charge-discharge capacity and the multiplying power are greatly limited at low temperature, so that the temperature of the battery is increased in a common external heating mode at low temperature to improve the low-temperature environment adaptability of the whole vehicle. The conventional external heating mode is a heating film heating mode and a liquid heating mode, wherein the heating film heating mode is to integrate a heating film in a battery pack, the voltage of a battery system is a heating power supply, once the electric connection part in the heating film or the heating system is abnormal such as disconnection and short circuit, the heating function is invalid or continuous heating is caused, the temperature difference of the battery system is further increased, the charging and discharging functions of the whole automobile are limited, and the like.
The battery has a plurality of parallel branches at present, the anode and the cathode of the heating system respectively use 1 relay under the influence of factors such as cost, and the heating circuit has no current sensor, so that after the battery heating system fails, whether the heating circuit is abnormal or not can be judged only through the temperature rise state. At present, whether a heating system has faults (short circuit, open circuit or uncontrolled) is mainly judged by judging the state of a heating relay and the temperature rise of a battery system within a period of time, and the abnormal temperature rise is often difficult to judge and more misjudgment can occur due to the influence of the difference of the arrangement positions of the batteries (part of battery packs are arranged at the large top position with good heat dissipation environment and part of battery packs are arranged near a motor and a controller with a high-temperature heat source).
Disclosure of Invention
The invention provides a power battery system and a heating system abnormality diagnosis method thereof, which are used for solving the problem that misjudgment is easy to occur when temperature rise is used for judging abnormality in the prior art.
In order to solve the technical problems, the technical scheme and the corresponding beneficial effects of the technical scheme are as follows:
the invention provides a technical scheme of a diagnosis method for abnormality of a power battery heating system, when the current state of the whole vehicle is stable, the actual current value of the whole vehicle heating system is obtained by utilizing the current difference of the whole vehicle before and after a heating relay is closed; comparing the actual current value with a theoretical current range of the heating system, and if the actual current value exceeds the theoretical current range, making the heating system abnormal; the theoretical current range is calculated according to the number of single battery cores corresponding to each heating branch, the heating voltage range corresponding to the single battery core and the total resistance value of each heating branch.
The beneficial effects of the technical scheme are as follows: the effectiveness and the accuracy of the abnormality diagnosis of the heating system are improved, misjudgment caused by the problems of long temperature judgment time or uneven temperature distribution and the like is avoided, the advance of the abnormality judgment of the heating system is improved, and the judgment is not required to be carried out through the whole temperature rise of the power battery; the actual current value of the whole vehicle is utilized to be within the theoretical current range, and the result is more accurate.
Further, when the current change of the whole vehicle in the set time interval is smaller than a set minimum threshold value, the current state of the whole vehicle is considered to be stable.
The method is simple, reliable and easy to realize, and is used for detecting whether the current state of the whole vehicle is stable or not by presetting the minimum threshold value of the current change and the detection interval and judging whether the current change exceeds the set minimum threshold value in the detection interval.
Further, when the battery management system judges that the battery is in constant current charging or the vehicle is in a power-on static state, the current state of the whole vehicle is considered to be stable.
Under the constant-current charging of the battery and the static state of the vehicle in the power-on state, the whole vehicle current meets the steady state, and the heating system current value can be calculated according to the total current difference before and after the heating relay is closed. Therefore, the stability of the whole vehicle current is determined by judging that the vehicle is in the two states.
Further, when the current state of the whole vehicle is judged to be stable, the heating relay is actively closed to obtain the current difference of the whole vehicle before and after the closing.
Because the heating loop is not provided with a Hall sensor, the method for predicting the current of the heating loop by heating the current difference of the whole car before and after opening or closing when the charging and discharging currents of the car are relatively stable has instability and relatively harsh conditions, and is not easy to reach. According to the scheme, when the whole car current is detected to be stable and the heating system current value is obtained by calculating the total current difference, the heating relay is actively closed, so that the detection times and the detection accuracy of the heating system are improved.
Further, the minimum value of the theoretical current range is equal to the sum of the minimum values of the theoretical currents of the individual heating branches; the maximum value of the theoretical current range is equal to the sum of the maximum values of the theoretical currents on each single heating branch, and the battery pack heating device comprises the same number of battery packs connected in series with each heating branch and different numbers of battery packs connected in series with each branch, and is wide in application range and high in compatibility.
Further, the theoretical current minimum value of the single heating branch is equal to the theoretical voltage range minimum value of the single heating branch divided by the total resistance value of the corresponding heating branch; the theoretical current maximum value of the single heating branch is equal to the theoretical voltage range maximum value of the single heating branch divided by the total resistance value of the corresponding heating branch; wherein the total resistance value is calculated from the theoretical resistance value of the heating film of the single battery pack.
Further, the minimum value of the theoretical voltage range of the single heating branch is equal to the minimum value of the heating voltage range corresponding to each single battery cell multiplied by the number of single battery cells of the single heating branch; the theoretical voltage range maximum value of the single heating branch is equal to the corresponding heating voltage range maximum value of each single cell multiplied by the single cell number of the single heating branch.
The invention also provides a technical scheme of the power battery system, which comprises a processor, wherein the processor is used for executing instructions for realizing the method for diagnosing the abnormality of the power battery heating system.
Drawings
FIG. 1 is a flow chart of a power battery heating system abnormality diagnostic method.
Detailed Description
The following describes the invention in more detail.
Method example 1:
the battery system (Cell Supervision Circuit) is provided with a plurality of battery branches, each battery branch is formed by connecting a plurality of battery packs in series, each battery pack is arranged in the battery box, and the battery branches are connected in parallel to form the battery system. Each battery pack consists of a plurality of modules, and each module consists of a plurality of single battery cells. The battery heating circuit is composed of a heating film arranged on the single battery core.
In the scheme, under the constant-current charging or power-on static state of a vehicle, the actual current value of a whole vehicle heating system is estimated by judging the difference of the total current of the whole vehicle before and after a heating relay is closed; calculating the total resistance of a single branch heating loop through vehicle configuration information, and further calculating the theoretical current range of the whole vehicle heating loop from the state of power shortage to the state of full charge of the battery; and judging whether the heating circuit has an abnormality such as open circuit, short circuit and the like by comparing whether the actual current value is in the theoretical current range.
As shown in fig. 1, the specific implementation method is as follows: importing vehicle configuration information to confirm the type, number and number N of battery boxes of the power battery system; calculating the total resistance value d of a single branch according to the theoretical resistance of the heating film of the single battery pack; assuming that the number of single-branch single-circuit cells is α, the theoretical minimum voltage value of the heating film corresponding to each single-circuit cell is 2.8V, and the maximum voltage value is 3.65V, then the single-branch theoretical voltage range [2.8×α,3.65×α ], and then the heating circuit theoretical current range [2.8×α/d×n,3.65×α/d×n ].
The vehicle state is monitored in real time through background big data, and when one of the following two conditions is met, whether the estimated actual current value is in the theoretical current range is immediately compared: the first condition is that the state of the battery management system is charging and the current changes for 60 seconds by no more than 5%, and if the state of the heating relay changes, the difference of the total current of the whole vehicle before and after the change, namely the actual current value I, is recorded; the second condition is that the state of the battery management system is discharge, the vehicle speed is 0, the current of the whole vehicle continuously changes for 40 seconds by not more than 5%, and at the moment, if the state of the heating relay changes, the difference between the total current of the whole vehicle before and after the change, namely the actual current value I, is recorded.
If the actual current value I exceeds the theoretical current range [2.8 [ alpha ]/d [ N ], 3.65 [ alpha ]/d [ N ], immediately reporting the heating system abnormality, and pushing the heating system for after-sale treatment.
Method example 2:
the difference between this embodiment and method embodiment 1 is that: how to judge the whole car reaches a stable state. In the embodiment, whether the whole vehicle is stable or not is automatically judged by a battery management system; in the method embodiment 1, the state of the vehicle is monitored in real time through background big data, and the condition of the stable state is judged to be met.
Because the heating loop is not provided with a Hall sensor, the method for estimating the actual current value of the heating loop by heating the whole car current difference before and after opening or closing when the charging and discharging currents of the car are relatively stable has instability and relatively harsh conditions, and is not easy to reach, and another optimization scheme is provided:
a judging module for current stability is added in a BMS (Battery Management System ) program, the BMS controls the heating relay to be closed in a short time when a current stability condition is met, an actual current value is calculated, and the heating relay is opened after the calculation is completed; marking vehicle configuration information (type, number and number of branches of a whole vehicle N) in a BMS (battery box), calculating a theoretical current value range of a heating loop after identifying the vehicle information, judging after comparing the result, and adding related fault alarm information; the BMS forcibly closes the influence of the heating relay on other functions when the heating-on condition is not satisfied.
The BMS automatically judges whether the current state of the whole car is stable or not, when the continuous 60 second change of the whole car current is not more than 5%, the heating function is actively started (the heating relay is closed) in a short time, the calculation of the current difference (namely the actual current value) of the whole car before and after the heating is started is added, the heating relay is immediately disconnected after the calculation is completed, and the BMS automatically judges whether the actual current value of the estimated heating loop is in the theoretical current range or not.
If the actual current value exceeds the theoretical current range, immediately reporting the heating system abnormality, and pushing the heating system abnormality after sale for processing.
System embodiment:
the power battery system of the present invention includes a processor for executing instructions for implementing the method for diagnosing an abnormality of a heating system of a power battery as described above, and the specific implementation method of the present invention has been described in the embodiment of the method for diagnosing an abnormality of a heating system of a power battery, and is not described herein in detail.
According to the technical scheme, the abnormal heating system is identified in advance through a big data technology or a method for increasing functions of the BMS system, and the safety index of the battery is increased.
The above gives a specific embodiment to which the present invention relates, but the present invention is not limited to the described embodiment. Under the thought of the invention, the technical means in the embodiment are changed, replaced and modified in a manner which is easily thought to a person skilled in the art, and the technical means have basically the same functions as the corresponding technical means in the invention, and the aim of the invention is also basically the same, so that the technical scheme is formed by fine tuning the embodiment, and the technical scheme still falls within the protection scope of the invention.
Claims (8)
1. The method is characterized in that when the current state of the whole vehicle is stable, the actual current value of the whole vehicle heating system is obtained by utilizing the current difference of the whole vehicle before and after the heating relay is closed; comparing the actual current value with a theoretical current range of the heating system, and if the actual current value exceeds the theoretical current range, making the heating system abnormal; the theoretical current range is calculated according to the number of single battery cores corresponding to each heating branch, the heating voltage range corresponding to the single battery core and the total resistance value of each heating branch.
2. The method for diagnosing a heating system abnormality of a power battery according to claim 1, wherein the current state of the whole vehicle is considered to be stable when the current variation of the whole vehicle is smaller than a set minimum threshold value within a set time interval.
3. The method according to claim 1, wherein the entire vehicle current state is considered to be stable when the battery is judged to be in constant current charge or when the vehicle is judged to be in a power-on stationary state by the battery management system.
4. The method for diagnosing an abnormality of a heating system for a power battery according to claim 2 or 3, wherein when it is judged that the current state of the whole vehicle is stable, the heating relay is actively closed to obtain the current difference of the whole vehicle before and after closing.
5. A method of diagnosing a power cell heating system abnormality as claimed in claim 2 or 3, wherein the minimum value of the theoretical current range is equal to the sum of the theoretical current minimum values of the individual heating branches; the maximum value of the theoretical current range is equal to the sum of the theoretical current maximum values on each individual heating branch.
6. The method of claim 5, wherein the single heating branch theoretical current minimum is equal to the single heating branch theoretical voltage range minimum divided by the total resistance of the corresponding heating branch; the theoretical current maximum value of the single heating branch is equal to the theoretical voltage range maximum value of the single heating branch divided by the total resistance value of the corresponding heating branch; wherein the total resistance value is calculated from the theoretical resistance value of the heating film of the single battery pack.
7. The method for diagnosing a power battery heating system abnormality according to claim 6, wherein the theoretical voltage range minimum value of the single heating branch is equal to the heating voltage range minimum value corresponding to each individual cell multiplied by the number of individual cells of the single heating branch; the theoretical voltage range maximum value of the single heating branch is equal to the corresponding heating voltage range maximum value of each single cell multiplied by the single cell number of the single heating branch.
8. A power cell system comprising a processor for executing instructions for implementing a method of diagnosing a power cell heating system abnormality as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441778.7A CN116653602A (en) | 2022-11-17 | 2022-11-17 | Power battery system and heating system abnormality diagnosis method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441778.7A CN116653602A (en) | 2022-11-17 | 2022-11-17 | Power battery system and heating system abnormality diagnosis method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116653602A true CN116653602A (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211441778.7A Pending CN116653602A (en) | 2022-11-17 | 2022-11-17 | Power battery system and heating system abnormality diagnosis method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN116653602A (en) |
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2022
- 2022-11-17 CN CN202211441778.7A patent/CN116653602A/en active Pending
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