CN111361454A - Diagnosis method, device, equipment and storage medium of power battery thermal management system - Google Patents
Diagnosis method, device, equipment and storage medium of power battery thermal management system Download PDFInfo
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- CN111361454A CN111361454A CN202010190022.4A CN202010190022A CN111361454A CN 111361454 A CN111361454 A CN 111361454A CN 202010190022 A CN202010190022 A CN 202010190022A CN 111361454 A CN111361454 A CN 111361454A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention discloses a diagnosis method, a diagnosis device and a diagnosis equipment of a power battery thermal management system, wherein the method comprises the following steps: monitoring a fault of a hardware element of the power battery thermal management system to obtain a hardware monitoring result; and if the hardware monitoring result indicates that the hardware element has no fault, performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process to obtain a fault diagnosis result. By adopting the technical scheme, the fault diagnosis of the power battery thermal management system can be realized according to the preset diagnosis process under the condition that the hardware element has no fault, compared with the prior art, the cost is lower, the timeliness and the accuracy of the fault diagnosis are improved, and the power battery can be stably and reliably used.
Description
Technical Field
The embodiment of the invention relates to the technical field of power battery management, in particular to a diagnosis method, a diagnosis device, diagnosis equipment and a storage medium of a power battery thermal management system.
Background
The power battery is used as a core component of the electric automobile, and the performance of the power battery is inseparable from a thermal management system. Taking a lithium ion battery as an example, when the temperature of the battery is too high, the service life of the battery is shortened, and even the thermal runaway of the battery can be caused in serious cases; too low a temperature of the battery will affect the charge and discharge, the available capacity, the service life and the like of the battery. Common power battery thermal management modes include liquid medium thermal management, air medium thermal management, phase change material thermal management, Positive Temperature Coefficient (PTC) heat pipe thermal management and the like, and can also be a combination of several thermal management modes. The current scheme of using a liquid medium to assist a PTC heat pipe for battery system thermal management is the mainstream scheme of a power battery thermal management system for an automobile.
Because the power battery thermal management system is usually integrated in the whole vehicle thermal management system, the execution elements, pipelines, switching valves and corresponding control of the whole thermal management system are complex, how to ensure the accurate execution of the battery thermal management system and ensure that the faults of the battery thermal management system can be diagnosed timely and accurately is an important work in the battery thermal management system. The current fault diagnosis scheme of the whole vehicle thermal management system needs a plurality of monitored variables and a plurality of high-precision sensing devices, such as flow and pressure sensors, and has high product cost.
Disclosure of Invention
The embodiment of the invention provides a diagnosis method, a diagnosis device, equipment and a storage medium of a power battery thermal management system, which can realize low-cost fault diagnosis of the power battery thermal management system.
In a first aspect, an embodiment of the present invention provides a diagnostic method for a power battery thermal management system, including:
monitoring a fault of a hardware element of the power battery thermal management system to obtain a hardware monitoring result;
and if the hardware monitoring result indicates that the hardware element has no fault, performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process to obtain a fault diagnosis result.
Optionally, the monitoring a fault of a hardware element of the power battery thermal management system to obtain a hardware monitoring result includes:
determining whether a fault exists based on a working signal transmitted by the hardware element, and if the working signal is an alarm signal, determining that the fault exists in the hardware element according to a hardware detection result; otherwise, the hardware detection result indicates that the hardware element has no fault.
Optionally, the element to be diagnosed includes at least one of a battery pack cooling liquid transmission port, a cooling source, a cooling liquid circulation executing element, and a battery internal heat exchanging mechanism.
Optionally, the performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to the set diagnosis process to obtain a fault diagnosis result includes:
acquiring power failure time, and comparing the power failure time with a set time threshold;
if the power failure time is larger than or equal to the set time threshold, performing credible fault diagnosis on the temperature of the battery pack cooling liquid transmission port to obtain a first diagnosis result;
if the first diagnosis result indicates that the battery pack cooling liquid transmission port does not have a credible fault, performing fault diagnosis on the cooling source and the cooling liquid circulation execution element to obtain a second diagnosis result;
and if the second diagnosis result shows that the cooling source and the cooling liquid circulation executing element have no fault, performing fault diagnosis on the heat exchange mechanism in the battery to obtain a third diagnosis result.
Optionally, performing a trusted fault diagnosis on the temperature of the battery pack coolant delivery port to obtain a first diagnosis result, including:
determining the absolute value of the difference between the average ambient temperature value in a first set time period after the power battery thermal management system is powered on and the average temperature value of the battery pack cooling liquid transmission port, wherein the battery pack cooling liquid transmission port is a battery pack cooling liquid inlet or a battery pack cooling liquid outlet;
if the absolute value of the difference value is larger than or equal to a first set temperature threshold value, the first diagnosis result indicates that a credible fault exists in the battery pack cooling liquid transmission port; otherwise, the first diagnosis result is that the battery pack cooling liquid transmission port has no credible fault.
Optionally, performing fault diagnosis on the cooling source and the cooling liquid circulation executing element to obtain a second diagnosis result, where the fault diagnosis includes:
determining a falling temperature of the battery pack coolant inlet relative to a freezing temperature, a temperature of the battery pack coolant inlet, and a temperature of the cooling source within a second set period of time;
and performing fault diagnosis on the cooling source and the cooling liquid circulation executing element based on the drop temperature, the temperature of the cooling liquid inlet of the battery pack and the temperature of the cooling source to obtain a second diagnosis result.
Optionally, performing fault diagnosis on the heat exchange mechanism inside the battery to obtain a third diagnosis result, including:
determining the difference value between the average value of the monitored temperature inside the battery and the temperature of the cooling liquid inlet of the battery pack;
if the difference value is greater than or equal to a second set temperature threshold value and the average value of the monitored temperatures inside the battery is greater than or equal to a third set temperature threshold value, the third diagnosis result indicates that the heat exchange mechanism inside the battery has a fault; otherwise, the third diagnosis result indicates that the heat exchange mechanism in the battery has no fault.
In a second aspect, an embodiment of the present invention further provides a diagnostic apparatus for a power battery thermal management system, including:
the hardware monitoring module is used for monitoring faults of hardware elements of the power battery thermal management system to obtain a hardware monitoring result;
and the fault diagnosis module is used for carrying out fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process if the hardware monitoring result indicates that the hardware element has no fault, so as to obtain a fault diagnosis result.
In a third aspect, an embodiment of the present invention further provides an apparatus, where the apparatus includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, the one or more programs cause the one or more processors to implement the diagnostic method for the power battery thermal management system as described above.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the diagnostic method of the power battery thermal management system as described above.
According to the diagnosis scheme of the power battery thermal management system provided by the embodiment of the invention, the hardware element of the power battery thermal management system is subjected to fault monitoring to obtain a hardware monitoring result, and if the hardware monitoring result indicates that the hardware element has no fault, the element to be diagnosed in the power battery thermal management system is subjected to fault diagnosis according to a set diagnosis process to obtain a fault diagnosis result. By adopting the technical scheme, the fault diagnosis of the power battery thermal management system can be realized according to the preset diagnosis process under the condition that the hardware element has no fault, compared with the prior art, the cost is lower, the timeliness and the accuracy of the fault diagnosis are improved, and the power battery can be stably and reliably used.
Drawings
Fig. 1 is a flowchart of a diagnostic method for a thermal management system of a power battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power battery thermal management system according to an embodiment of the present invention;
FIG. 3 is a flow chart of another diagnostic method for a thermal management system of a power battery according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a diagnostic device of a power battery thermal management system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Fig. 1 is a flowchart of a diagnostic method for a thermal management system of a power battery according to an embodiment of the present invention, where the present embodiment is applicable to a situation of performing fault diagnosis on the thermal management system of the power battery, and the method may be executed by a diagnostic apparatus of the thermal management system of the power battery, where the apparatus may be implemented in a software and/or hardware manner, and the apparatus may be configured in an electronic device, such as a server or a terminal device, where a typical terminal device includes a mobile terminal, and specifically includes a mobile phone, a computer, or a tablet computer. As shown in fig. 1, the method may specifically include:
and S110, carrying out fault monitoring on hardware elements of the power battery thermal management system to obtain a hardware monitoring result.
The power battery thermal management system is a system capable of reasonably controlling the temperature of the power battery, and the specific power battery thermal management system is not limited in the embodiment of the invention. For example, fig. 2 is a schematic structural diagram of a power battery thermal management system according to an embodiment of the present invention, and as shown in fig. 2, the power battery thermal management system may include a battery pack 11, a cooling system 12, a battery cell temperature collecting element 21, a cooling source temperature collecting element 22, a battery pack coolant inlet temperature collecting element 23, a battery pack coolant outlet temperature collecting element 24, a battery pack external temperature collecting element 25, and a coolant circulation executing element 26, where specific components of each temperature collecting element and each coolant circulation executing element 26 are not limited, for example, the temperature collecting element may be a temperature sensor, and the coolant circulation executing element 26 may be a coolant circulation water pump, and the like.
Battery cell temperature acquisition element 21 can be installed near battery cell positive pole in battery package 11, and cooling source temperature acquisition element 22 can be installed in the coolant liquid exit of cooling system 12, and battery package coolant liquid entry temperature acquisition element 23 can be installed in battery package coolant liquid entrance, and battery package coolant liquid exit temperature acquisition element 24 can be installed in battery package coolant liquid exit, and battery package outside temperature acquisition element 25 can be installed in the battery package outside can embody outside ambient temperature department.
In the embodiment of the invention, the hardware element can be understood as a hardware device related to thermal management in the power battery thermal management system, and the specific type and number of the elements are not limited, the hardware element may include at least one of an execution element and a collection element, the execution element may include at least one of a coolant circulating water pump, a cooling switch execution valve, a cooling system compressor, and the like, and the collection element may include at least one of a cooling source temperature collection element, a battery pack coolant inlet temperature collection element, a battery pack coolant outlet temperature collection element, and the like.
Specifically, the monitoring of the fault of the hardware element of the power battery thermal management system to obtain the hardware monitoring result may include: determining whether a fault exists based on a working signal transmitted by the hardware element, and if the working signal is an alarm signal, determining that the fault exists in the hardware element according to a hardware detection result; otherwise, the hardware detection result indicates that the hardware element has no fault. The type or form of the working signal transmitted by different hardware elements may be different, and the embodiment of the present invention is not limited thereto. Hardware elements in the power battery thermal management system can be configured with self-test programs or modules, and when a hardware fault occurs, an alarm signal can be sent to a diagnosis device. If the diagnosis device of the power battery thermal management system receives an alarm signal of a hardware element, the hardware element can be determined to have a fault, fault alarm is executed, and if the received working signal is a non-alarm signal, the hardware element is determined to have no fault. It can be understood that the fault monitoring of the hardware element belongs to the failure judgment of the hardware element, and the subsequent fault diagnosis is performed in the embodiment of the invention under the condition that the hardware element is determined not to have failure.
And S120, if the hardware monitoring result indicates that the hardware element has no fault, performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process to obtain a fault diagnosis result.
The element to be diagnosed can comprise at least one of a battery pack cooling liquid transmission port, a cooling source, a cooling liquid circulation execution element, a battery internal heat exchange mechanism and the like, and the battery pack cooling liquid transmission port can comprise a battery pack cooling liquid inlet and a battery pack cooling liquid outlet.
In the embodiment of the present invention, performing fault diagnosis on an element to be diagnosed in a thermal management system of a power battery according to a set diagnosis process to obtain a fault diagnosis result, which may include: acquiring power failure time, and comparing the power failure time with a set time threshold; if the power failure time is larger than or equal to the set time threshold, performing credible fault diagnosis on the temperature of the cooling liquid transmission port of the battery pack to obtain a first diagnosis result; if the first diagnosis result is that the battery pack cooling liquid transmission port does not have a credible fault, performing fault diagnosis on the cooling source and the cooling liquid circulation execution element to obtain a second diagnosis result; and if the second diagnosis result is that neither the cooling source nor the cooling liquid circulation executing element has faults, carrying out fault diagnosis on the heat exchange mechanism in the battery to obtain a third diagnosis result.
The set time threshold may be set according to actual conditions, and is not limited in the embodiment of the present invention, for example, the set time threshold may be 6 hours. After the power battery thermal management system is powered off, the power off time can be counted, the power off time is compared with a set time threshold, and if the power off time is larger than or equal to the set time threshold, the temperature of a battery pack cooling liquid inlet or a battery pack cooling liquid outlet is subjected to credible fault diagnosis.
Optionally, performing a trusted fault diagnosis on the temperature of the coolant delivery port of the battery pack to obtain a first diagnosis result, which may include: determining the absolute value of the difference between the average ambient temperature value and the average temperature value of a battery pack cooling liquid transmission port in a first set time period after the power battery thermal management system is powered on, wherein the battery pack cooling liquid transmission port is a battery pack cooling liquid inlet or a battery pack cooling liquid outlet; if the absolute value of the difference is larger than or equal to a first set temperature threshold value, the first diagnosis result indicates that a credible fault exists in the cooling liquid transmission port of the battery pack; otherwise, the first diagnosis result is that the battery pack cooling liquid transmission port has no credible fault.
Both the first set time period and the first set temperature threshold may be set according to actual conditions, and for example, the first set time period may be 50 ms. If the absolute value of the difference is larger than or equal to the first set temperature threshold, it can be determined that the first diagnosis result is that a reliable fault exists in the battery pack cooling liquid transmission port, that is, the temperature collected in the battery pack cooling liquid transmission port may be inaccurate due to the fact that a large resistor exists in a circuit, and the like, so that the temperature is not reliable. If the absolute value of the difference is less than the first set temperature threshold, it may be determined that the first diagnostic result is that there is no authentic fault with the battery pack coolant transfer port.
Optionally, performing fault diagnosis on the cooling source and the cooling liquid circulation executing element to obtain a second diagnosis result, which may include: determining a falling temperature of the battery pack cooling liquid inlet relative to the freezing temperature, the temperature of the battery pack cooling liquid inlet and the temperature of the cooling source in a second set time period; and performing fault diagnosis on the cooling source and the cooling liquid circulation executing element based on the drop temperature, the temperature of the cooling liquid inlet of the battery pack and the temperature of the cooling source to obtain a second diagnosis result.
The specific value of the second set time period is not limited in the embodiment of the present invention. The freezing temperature can be the temperature of a cooling liquid inlet of the battery pack when the thermal management system of the power battery enters a cooling state, and the falling temperature can be the difference between the freezing temperature and the temperature of the cooling liquid inlet of the battery pack after a second set time period. If the hardware element in the power battery thermal management system is not in fault, the battery pack cooling liquid transmission port is not in credible fault, and the power battery thermal management system is in a battery cooling state, the temperature of the cooling source can be compared with the fifth set temperature threshold to carry out fault positioning when the temperature of the cooling source is lower than the lower temperature threshold and the temperature of the battery pack cooling liquid inlet is greater than or equal to the fourth set temperature threshold; otherwise, it can be determined that the cooling source and the coolant circulation actuator are not malfunctioning. Specifically, if the temperature of the cooling source is greater than or equal to the fifth set temperature threshold and the battery pack is still in a state of needing cooling, it may be determined that the cooling source has a fault; if the temperature of the cooling source is less than the fifth set temperature threshold and the battery pack is still in a state where cooling is required, it may be determined that the coolant circulation actuator is malfunctioning.
The falling temperature threshold, the fourth set temperature threshold and the fifth temperature threshold can be set according to actual conditions, and are not limited specifically. The second failure diagnosis result includes a failure diagnosis result of the cooling source and a failure diagnosis result of the cooling liquid circulation performing element.
Optionally, performing fault diagnosis on the heat exchange mechanism inside the battery to obtain a third diagnosis result, which may include: determining the difference value between the average value of the monitored temperature inside the battery and the temperature of a cooling liquid inlet of the battery pack; if the difference value is greater than or equal to the second set temperature threshold value and the average value of the monitored temperatures inside the battery is greater than or equal to a third set temperature threshold value, the third diagnosis result indicates that the heat exchange mechanism inside the battery has a fault; otherwise, the third diagnosis result shows that the heat exchange mechanism in the battery has no fault.
The second set temperature threshold and the third set temperature threshold may be set according to actual conditions, and are not limited specifically. If a hardware element in the power battery thermal management system is not faulty, a battery pack cooling liquid transmission port is not faulty, a cooling source and a cooling liquid circulation execution element are not faulty, and the power battery thermal management system is in a battery cooling state, detecting the average value of the monitored temperature inside the battery and the temperature of the battery pack cooling liquid inlet in real time, and if the difference obtained by subtracting the temperature of the battery pack cooling liquid inlet from the average value of the monitored temperature inside the battery is greater than or equal to a second set temperature threshold and the average value of the monitored temperature inside the battery is greater than or equal to a third set temperature threshold, determining that a third diagnosis result is that a heat exchange mechanism inside the battery has a fault; otherwise, the third diagnosis result shows that the heat exchange mechanism in the battery has no fault.
According to the diagnosis scheme of the power battery thermal management system provided by the embodiment of the invention, the hardware element of the power battery thermal management system is subjected to fault monitoring to obtain a hardware monitoring result, and if the hardware monitoring result indicates that the hardware element has no fault, the element to be diagnosed in the power battery thermal management system is subjected to fault diagnosis according to a set diagnosis process to obtain a fault diagnosis result. By adopting the technical scheme, the fault diagnosis of the power battery thermal management system can be realized according to the preset diagnosis process under the condition that the hardware element has no fault, compared with the prior art, the cost is lower, the timeliness and the accuracy of the fault diagnosis are improved, and the power battery can be stably and reliably used.
Fig. 3 is a flowchart of another diagnostic method for a thermal management system of a power battery according to an embodiment of the present invention. The present embodiment specifically describes the diagnostic method of the thermal management system of the power battery on the basis of the above embodiments. Correspondingly, as shown in fig. 3, the method of the embodiment specifically includes:
s201, carrying out fault monitoring on hardware elements of the power battery thermal management system to obtain a hardware monitoring result.
S202, judging whether a hardware monitoring result is that a hardware element has no fault, if so, executing S203; otherwise, S210 is performed.
S203, obtaining power-down time, and comparing the power-down time with a set time threshold.
S204, judging whether the power failure time is larger than or equal to a set time threshold, if so, executing S205; otherwise, S206 is executed.
S205, determining the absolute value of the difference between the average value of the ambient temperature and the average value of the temperature of the cooling liquid transmission port of the battery pack in a first set time period after the power battery thermal management system is powered on, judging whether the absolute value of the difference is greater than or equal to a first set temperature threshold, and if not, executing S206; otherwise, S211 is executed.
S206, judging whether the power battery thermal management system enters a cooling state, if so, executing S207; otherwise, S215 is performed.
The determination method of whether the power battery thermal management system enters the cooling state is not limited in this embodiment, and may be set according to an actual situation, for example, if it is determined that a cooling switch execution valve of the power battery thermal management system is opened, it may be determined that the power battery thermal management system enters the cooling state.
S207, judging whether the dropping temperature of the cooling liquid inlet of the battery pack relative to the freezing temperature is smaller than a dropping temperature threshold value in a second set time period, and whether the temperature of the cooling liquid inlet of the battery pack is larger than or equal to a fourth set temperature threshold value, if so, executing S208; otherwise, S209 is executed.
S208, judging whether the temperature of the cooling source is smaller than a fifth set temperature threshold value, if so, executing S212; otherwise, S213 is executed.
S209, judging whether the difference value between the average value of the monitored temperature inside the battery and the temperature of the cooling liquid inlet of the battery pack is greater than or equal to a second set temperature threshold value or not and whether the average value of the monitored temperature inside the battery is greater than or equal to a third set temperature threshold value or not, if so, executing S214; otherwise, S215 is performed.
And S210, providing a hardware element fault alarm.
And S211, providing a credible fault alarm of the battery pack cooling liquid transmission port.
And S212, providing a fault alarm of the cooling liquid circulation execution element.
And S213, providing a cooling source fault alarm.
And S214, providing a fault alarm for the heat exchange mechanism in the battery.
S215, determining that the power battery thermal management system has no fault.
According to the diagnosis scheme of the power battery thermal management system provided by the embodiment of the invention, the hardware element of the power battery thermal management system is subjected to fault monitoring to obtain a hardware monitoring result, and if the hardware monitoring result indicates that the hardware element has no fault, the element to be diagnosed in the power battery thermal management system is subjected to fault diagnosis according to a set diagnosis process to obtain a fault diagnosis result. By adopting the technical scheme, the fault diagnosis of the power battery thermal management system can be realized according to the preset diagnosis process under the condition that the hardware element has no fault, compared with the prior art, the cost is lower, the timeliness and the accuracy of the fault diagnosis are improved, and the power battery can be stably and reliably used.
Fig. 4 is a schematic structural diagram of a diagnostic apparatus for a power battery thermal management system according to an embodiment of the present invention, where the embodiment is applicable to a case of performing fault diagnosis on the power battery thermal management system. The diagnosis device of the power battery thermal management system provided by the embodiment of the invention can execute the diagnosis method of the power battery thermal management system provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. The device specifically includes:
the hardware monitoring module 310 is configured to perform fault monitoring on a hardware element of the power battery thermal management system to obtain a hardware monitoring result;
and the fault diagnosis module 320 is configured to perform fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process if the hardware monitoring result indicates that the hardware element has no fault, so as to obtain a fault diagnosis result.
According to the diagnosis scheme of the power battery thermal management system provided by the embodiment of the invention, the hardware element of the power battery thermal management system is subjected to fault monitoring to obtain a hardware monitoring result, and if the hardware monitoring result indicates that the hardware element has no fault, the element to be diagnosed in the power battery thermal management system is subjected to fault diagnosis according to a set diagnosis process to obtain a fault diagnosis result. By adopting the technical scheme, the fault diagnosis of the power battery thermal management system can be realized according to the preset diagnosis process under the condition that the hardware element has no fault, compared with the prior art, the cost is lower, the timeliness and the accuracy of the fault diagnosis are improved, and the power battery can be stably and reliably used.
Optionally, the hardware monitoring module 310 is specifically configured to:
determining whether a fault exists based on a working signal transmitted by the hardware element, and if the working signal is an alarm signal, determining that the fault exists in the hardware element according to a hardware detection result; otherwise, the hardware detection result indicates that the hardware element has no fault.
Optionally, the element to be diagnosed includes at least one of a battery pack cooling liquid transmission port, a cooling source, a cooling liquid circulation executing element, and a battery internal heat exchanging mechanism.
Optionally, the fault diagnosis module 320 includes:
the power failure time comparison unit is used for acquiring power failure time and comparing the power failure time with a set time threshold;
the first diagnosis unit is used for carrying out credible fault diagnosis on the temperature of the battery pack cooling liquid transmission port to obtain a first diagnosis result if the power failure time is greater than or equal to the set time threshold;
the second diagnosis unit is used for diagnosing faults of the cooling source and the cooling liquid circulation execution element to obtain a second diagnosis result if the first diagnosis result indicates that the battery pack cooling liquid transmission port does not have a credible fault;
and the third diagnosis unit is used for diagnosing the fault of the heat exchange mechanism in the battery to obtain a third diagnosis result if the second diagnosis result indicates that the cooling source and the cooling liquid circulation execution element have no fault.
Optionally, the first diagnosis unit is specifically configured to:
determining the absolute value of the difference between the average ambient temperature value in a first set time period after the power battery thermal management system is powered on and the average temperature value of the battery pack cooling liquid transmission port, wherein the battery pack cooling liquid transmission port is a battery pack cooling liquid inlet or a battery pack cooling liquid outlet;
if the absolute value of the difference value is larger than or equal to a first set temperature threshold value, the first diagnosis result indicates that a credible fault exists in the battery pack cooling liquid transmission port; otherwise, the first diagnosis result is that the battery pack cooling liquid transmission port has no credible fault.
Optionally, the second diagnosis unit is specifically configured to:
determining a falling temperature of the battery pack coolant inlet relative to a freezing temperature, a temperature of the battery pack coolant inlet, and a temperature of the cooling source within a second set period of time;
and performing fault diagnosis on the cooling source and the cooling liquid circulation executing element based on the drop temperature, the temperature of the cooling liquid inlet of the battery pack and the temperature of the cooling source to obtain a second diagnosis result.
Optionally, the third diagnostic unit is specifically configured to:
determining the difference value between the average value of the monitored temperature inside the battery and the temperature of the cooling liquid inlet of the battery pack;
if the difference value is greater than or equal to a second set temperature threshold value and the average value of the monitored temperatures inside the battery is greater than or equal to a third set temperature threshold value, the third diagnosis result indicates that the heat exchange mechanism inside the battery has a fault; otherwise, the third diagnosis result indicates that the heat exchange mechanism in the battery has no fault.
The diagnosis device of the power battery thermal management system provided by the embodiment of the invention can execute the diagnosis method of the power battery thermal management system provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Fig. 5 is a schematic structural diagram of an apparatus according to an embodiment of the present invention. FIG. 5 illustrates a block diagram of an exemplary device 412 suitable for use in implementing embodiments of the present invention. The device 412 shown in fig. 5 is only an example and should not impose any limitation on the functionality or scope of use of embodiments of the present invention.
As shown in fig. 5, the device 412 is in the form of a general purpose device. The components of device 412 may include, but are not limited to: one or more processors 416, a storage device 428, and a bus 418 that couples the various system components including the storage device 428 and the processors 416.
A program/utility 440 having a set (at least one) of program modules 442 may be stored, for instance, in storage 428, such program modules 442 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. The program modules 442 generally perform the functions and/or methodologies of the described embodiments of the invention.
The device 412 may also communicate with one or more external devices 414 (e.g., keyboard, pointing terminal, display 424, etc.), with one or more terminals that enable a user to interact with the device 412, and/or with any terminals (e.g., network card, modem, etc.) that enable the device 412 to communicate with one or more other computing terminals. Such communication may occur via input/output (I/O) interfaces 422. Further, the device 412 may also communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN), and/or a public Network, such as the internet) via the Network adapter 420. As shown in FIG. 5, network adapter 420 communicates with the other modules of device 412 via bus 418. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the device 412, including but not limited to: microcode, end drives, Redundant processors, external disk drive Arrays, RAID (Redundant Arrays of Independent Disks) systems, tape drives, and data backup storage systems, among others.
The processor 416 executes various functional applications and data processing by executing programs stored in the storage device 428, for example, to implement a diagnostic method of the thermal management system of the power battery provided by the embodiment of the present invention, the method includes:
monitoring a fault of a hardware element of the power battery thermal management system to obtain a hardware monitoring result;
and if the hardware monitoring result indicates that the hardware original has no fault, performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process to obtain a fault diagnosis result.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a diagnostic method for a power battery thermal management system according to an embodiment of the present invention, where the method includes:
monitoring a fault of a hardware element of the power battery thermal management system to obtain a hardware monitoring result;
and if the hardware monitoring result indicates that the hardware original has no fault, performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process to obtain a fault diagnosis result.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A diagnostic method for a power battery thermal management system is characterized by comprising the following steps:
monitoring a fault of a hardware element of the power battery thermal management system to obtain a hardware monitoring result;
and if the hardware monitoring result indicates that the hardware element has no fault, performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process to obtain a fault diagnosis result.
2. The method of claim 1, wherein the performing fault monitoring on a hardware element of the power battery thermal management system to obtain a hardware monitoring result comprises:
determining whether a fault exists based on a working signal transmitted by the hardware element, and if the working signal is an alarm signal, determining that the fault exists in the hardware element according to a hardware detection result; otherwise, the hardware detection result indicates that the hardware element has no fault.
3. The method of claim 1, wherein the component to be diagnosed comprises at least one of a battery pack coolant delivery port, a cooling source, a coolant circulation actuator, and a battery internal heat exchange mechanism.
4. The method according to claim 3, wherein the performing fault diagnosis on the element to be diagnosed in the power battery thermal management system according to the set diagnosis process to obtain a fault diagnosis result comprises:
acquiring power failure time, and comparing the power failure time with a set time threshold;
if the power failure time is larger than or equal to the set time threshold, performing credible fault diagnosis on the temperature of the battery pack cooling liquid transmission port to obtain a first diagnosis result;
if the first diagnosis result indicates that the battery pack cooling liquid transmission port does not have a credible fault, performing fault diagnosis on the cooling source and the cooling liquid circulation execution element to obtain a second diagnosis result;
and if the second diagnosis result shows that the cooling source and the cooling liquid circulation executing element have no fault, performing fault diagnosis on the heat exchange mechanism in the battery to obtain a third diagnosis result.
5. The method of claim 4, wherein performing an authentic fault diagnosis of the temperature of the battery pack coolant delivery port to obtain a first diagnostic result comprises:
determining the absolute value of the difference between the average ambient temperature value in a first set time period after the power battery thermal management system is powered on and the average temperature value of the battery pack cooling liquid transmission port, wherein the battery pack cooling liquid transmission port is a battery pack cooling liquid inlet or a battery pack cooling liquid outlet;
if the absolute value of the difference value is larger than or equal to a first set temperature threshold value, the first diagnosis result indicates that a credible fault exists in the battery pack cooling liquid transmission port; otherwise, the first diagnosis result is that the battery pack cooling liquid transmission port has no credible fault.
6. The method of claim 4, wherein performing fault diagnosis on the cooling source and the coolant circulation actuator to obtain a second diagnosis result comprises:
determining a falling temperature of the battery pack coolant inlet relative to a freezing temperature, a temperature of the battery pack coolant inlet, and a temperature of the cooling source within a second set period of time;
and performing fault diagnosis on the cooling source and the cooling liquid circulation executing element based on the drop temperature, the temperature of the cooling liquid inlet of the battery pack and the temperature of the cooling source to obtain a second diagnosis result.
7. The method of claim 4, wherein performing fault diagnosis on the internal heat exchange mechanism of the battery to obtain a third diagnosis result comprises:
determining the difference value between the average value of the monitored temperature inside the battery and the temperature of the cooling liquid inlet of the battery pack;
if the difference value is greater than or equal to a second set temperature threshold value and the average value of the monitored temperatures inside the battery is greater than or equal to a third set temperature threshold value, the third diagnosis result indicates that the heat exchange mechanism inside the battery has a fault; otherwise, the third diagnosis result indicates that the heat exchange mechanism in the battery has no fault.
8. A diagnostic device for a power battery thermal management system, comprising:
the hardware monitoring module is used for monitoring faults of hardware elements of the power battery thermal management system to obtain a hardware monitoring result;
and the fault diagnosis module is used for carrying out fault diagnosis on the element to be diagnosed in the power battery thermal management system according to a set diagnosis process if the hardware monitoring result indicates that the hardware element has no fault, so as to obtain a fault diagnosis result.
9. An apparatus, characterized in that the apparatus comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the diagnostic method for a power cell thermal management system of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a diagnostic method of a thermal management system of a power battery according to any one of claims 1 to 7.
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